// Copyright 2015 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/objects.h"
#include <cmath>
#include <iomanip>
#include <memory>
#include <sstream>
#include <unordered_map>
#include <unordered_set>
#include "src/objects-inl.h"
#include "src/accessors.h"
#include "src/allocation-site-scopes.h"
#include "src/api-arguments-inl.h"
#include "src/api-natives.h"
#include "src/api.h"
#include "src/arguments.h"
#include "src/base/bits.h"
#include "src/base/utils/random-number-generator.h"
#include "src/bootstrapper.h"
#include "src/code-stubs.h"
#include "src/codegen.h"
#include "src/compilation-dependencies.h"
#include "src/compiler.h"
#include "src/counters-inl.h"
#include "src/counters.h"
#include "src/date.h"
#include "src/debug/debug-evaluate.h"
#include "src/debug/debug.h"
#include "src/deoptimizer.h"
#include "src/elements.h"
#include "src/execution.h"
#include "src/field-index-inl.h"
#include "src/field-index.h"
#include "src/field-type.h"
#include "src/frames-inl.h"
#include "src/full-codegen/full-codegen.h"
#include "src/globals.h"
#include "src/ic/ic.h"
#include "src/identity-map.h"
#include "src/interpreter/bytecode-array-iterator.h"
#include "src/interpreter/bytecode-decoder.h"
#include "src/interpreter/interpreter.h"
#include "src/isolate-inl.h"
#include "src/keys.h"
#include "src/list.h"
#include "src/log.h"
#include "src/lookup.h"
#include "src/macro-assembler.h"
#include "src/map-updater.h"
#include "src/messages.h"
#include "src/objects-body-descriptors-inl.h"
#include "src/property-descriptor.h"
#include "src/prototype.h"
#include "src/regexp/jsregexp.h"
#include "src/safepoint-table.h"
#include "src/snapshot/code-serializer.h"
#include "src/source-position-table.h"
#include "src/string-builder.h"
#include "src/string-search.h"
#include "src/string-stream.h"
#include "src/utils.h"
#include "src/wasm/wasm-module.h"
#include "src/wasm/wasm-objects.h"
#include "src/zone/zone.h"
#ifdef ENABLE_DISASSEMBLER
#include "src/disasm.h"
#include "src/disassembler.h"
#include "src/eh-frame.h"
#endif
namespace v8 {
namespace internal {
std::ostream& operator<<(std::ostream& os, InstanceType instance_type) {
switch (instance_type) {
#define WRITE_TYPE(TYPE) \
case TYPE: \
return os << #TYPE;
INSTANCE_TYPE_LIST(WRITE_TYPE)
#undef WRITE_TYPE
}
UNREACHABLE();
return os << "UNKNOWN"; // Keep the compiler happy.
}
Handle<FieldType> Object::OptimalType(Isolate* isolate,
Representation representation) {
if (representation.IsNone()) return FieldType::None(isolate);
if (FLAG_track_field_types) {
if (representation.IsHeapObject() && IsHeapObject()) {
// We can track only JavaScript objects with stable maps.
Handle<Map> map(HeapObject::cast(this)->map(), isolate);
if (map->is_stable() && map->IsJSReceiverMap()) {
return FieldType::Class(map, isolate);
}
}
}
return FieldType::Any(isolate);
}
MaybeHandle<JSReceiver> Object::ToObject(Isolate* isolate,
Handle<Object> object,
Handle<Context> native_context) {
if (object->IsJSReceiver()) return Handle<JSReceiver>::cast(object);
Handle<JSFunction> constructor;
if (object->IsSmi()) {
constructor = handle(native_context->number_function(), isolate);
} else {
int constructor_function_index =
Handle<HeapObject>::cast(object)->map()->GetConstructorFunctionIndex();
if (constructor_function_index == Map::kNoConstructorFunctionIndex) {
THROW_NEW_ERROR(isolate,
NewTypeError(MessageTemplate::kUndefinedOrNullToObject),
JSReceiver);
}
constructor = handle(
JSFunction::cast(native_context->get(constructor_function_index)),
isolate);
}
Handle<JSObject> result = isolate->factory()->NewJSObject(constructor);
Handle<JSValue>::cast(result)->set_value(*object);
return result;
}
// ES6 section 9.2.1.2, OrdinaryCallBindThis for sloppy callee.
// static
MaybeHandle<JSReceiver> Object::ConvertReceiver(Isolate* isolate,
Handle<Object> object) {
if (object->IsJSReceiver()) return Handle<JSReceiver>::cast(object);
if (*object == isolate->heap()->null_value() ||
object->IsUndefined(isolate)) {
return isolate->global_proxy();
}
return Object::ToObject(isolate, object);
}
// static
MaybeHandle<Object> Object::ConvertToNumber(Isolate* isolate,
Handle<Object> input) {
while (true) {
if (input->IsNumber()) {
return input;
}
if (input->IsString()) {
return String::ToNumber(Handle<String>::cast(input));
}
if (input->IsOddball()) {
return Oddball::ToNumber(Handle<Oddball>::cast(input));
}
if (input->IsSymbol()) {
THROW_NEW_ERROR(isolate, NewTypeError(MessageTemplate::kSymbolToNumber),
Object);
}
ASSIGN_RETURN_ON_EXCEPTION(
isolate, input, JSReceiver::ToPrimitive(Handle<JSReceiver>::cast(input),
ToPrimitiveHint::kNumber),
Object);
}
}
// static
MaybeHandle<Object> Object::ConvertToInteger(Isolate* isolate,
Handle<Object> input) {
ASSIGN_RETURN_ON_EXCEPTION(isolate, input, ConvertToNumber(isolate, input),
Object);
if (input->IsSmi()) return input;
return isolate->factory()->NewNumber(DoubleToInteger(input->Number()));
}
// static
MaybeHandle<Object> Object::ConvertToInt32(Isolate* isolate,
Handle<Object> input) {
ASSIGN_RETURN_ON_EXCEPTION(isolate, input, ConvertToNumber(isolate, input),
Object);
if (input->IsSmi()) return input;
return isolate->factory()->NewNumberFromInt(DoubleToInt32(input->Number()));
}
// static
MaybeHandle<Object> Object::ConvertToUint32(Isolate* isolate,
Handle<Object> input) {
ASSIGN_RETURN_ON_EXCEPTION(isolate, input, ConvertToNumber(isolate, input),
Object);
if (input->IsSmi()) return handle(Smi::cast(*input)->ToUint32Smi(), isolate);
return isolate->factory()->NewNumberFromUint(DoubleToUint32(input->Number()));
}
// static
MaybeHandle<Name> Object::ConvertToName(Isolate* isolate,
Handle<Object> input) {
ASSIGN_RETURN_ON_EXCEPTION(
isolate, input, Object::ToPrimitive(input, ToPrimitiveHint::kString),
Name);
if (input->IsName()) return Handle<Name>::cast(input);
return ToString(isolate, input);
}
// ES6 7.1.14
// static
MaybeHandle<Object> Object::ConvertToPropertyKey(Isolate* isolate,
Handle<Object> value) {
// 1. Let key be ToPrimitive(argument, hint String).
MaybeHandle<Object> maybe_key =
Object::ToPrimitive(value, ToPrimitiveHint::kString);
// 2. ReturnIfAbrupt(key).
Handle<Object> key;
if (!maybe_key.ToHandle(&key)) return key;
// 3. If Type(key) is Symbol, then return key.
if (key->IsSymbol()) return key;
// 4. Return ToString(key).
// Extending spec'ed behavior, we'd be happy to return an element index.
if (key->IsSmi()) return key;
if (key->IsHeapNumber()) {
uint32_t uint_value;
if (value->ToArrayLength(&uint_value) &&
uint_value <= static_cast<uint32_t>(Smi::kMaxValue)) {
return handle(Smi::FromInt(static_cast<int>(uint_value)), isolate);
}
}
return Object::ToString(isolate, key);
}
// static
MaybeHandle<String> Object::ConvertToString(Isolate* isolate,
Handle<Object> input) {
while (true) {
if (input->IsOddball()) {
return handle(Handle<Oddball>::cast(input)->to_string(), isolate);
}
if (input->IsNumber()) {
return isolate->factory()->NumberToString(input);
}
if (input->IsSymbol()) {
THROW_NEW_ERROR(isolate, NewTypeError(MessageTemplate::kSymbolToString),
String);
}
ASSIGN_RETURN_ON_EXCEPTION(
isolate, input, JSReceiver::ToPrimitive(Handle<JSReceiver>::cast(input),
ToPrimitiveHint::kString),
String);
// The previous isString() check happened in Object::ToString and thus we
// put it at the end of the loop in this helper.
if (input->IsString()) {
return Handle<String>::cast(input);
}
}
}
namespace {
bool IsErrorObject(Isolate* isolate, Handle<Object> object) {
if (!object->IsJSReceiver()) return false;
Handle<Symbol> symbol = isolate->factory()->stack_trace_symbol();
return JSReceiver::HasOwnProperty(Handle<JSReceiver>::cast(object), symbol)
.FromMaybe(false);
}
Handle<String> AsStringOrEmpty(Isolate* isolate, Handle<Object> object) {
return object->IsString() ? Handle<String>::cast(object)
: isolate->factory()->empty_string();
}
Handle<String> NoSideEffectsErrorToString(Isolate* isolate,
Handle<Object> input) {
Handle<JSReceiver> receiver = Handle<JSReceiver>::cast(input);
Handle<Name> name_key = isolate->factory()->name_string();
Handle<Object> name = JSReceiver::GetDataProperty(receiver, name_key);
Handle<String> name_str = AsStringOrEmpty(isolate, name);
Handle<Name> msg_key = isolate->factory()->message_string();
Handle<Object> msg = JSReceiver::GetDataProperty(receiver, msg_key);
Handle<String> msg_str = AsStringOrEmpty(isolate, msg);
if (name_str->length() == 0) return msg_str;
if (msg_str->length() == 0) return name_str;
IncrementalStringBuilder builder(isolate);
builder.AppendString(name_str);
builder.AppendCString(": ");
builder.AppendString(msg_str);
return builder.Finish().ToHandleChecked();
}
} // namespace
// static
Handle<String> Object::NoSideEffectsToString(Isolate* isolate,
Handle<Object> input) {
DisallowJavascriptExecution no_js(isolate);
if (input->IsString() || input->IsNumber() || input->IsOddball()) {
return Object::ToString(isolate, input).ToHandleChecked();
} else if (input->IsFunction()) {
// -- F u n c t i o n
Handle<String> fun_str;
if (input->IsJSBoundFunction()) {
fun_str = JSBoundFunction::ToString(Handle<JSBoundFunction>::cast(input));
} else {
DCHECK(input->IsJSFunction());
fun_str = JSFunction::ToString(Handle<JSFunction>::cast(input));
}
if (fun_str->length() > 128) {
IncrementalStringBuilder builder(isolate);
builder.AppendString(isolate->factory()->NewSubString(fun_str, 0, 111));
builder.AppendCString("...<omitted>...");
builder.AppendString(isolate->factory()->NewSubString(
fun_str, fun_str->length() - 2, fun_str->length()));
return builder.Finish().ToHandleChecked();
}
return fun_str;
} else if (input->IsSymbol()) {
// -- S y m b o l
Handle<Symbol> symbol = Handle<Symbol>::cast(input);
IncrementalStringBuilder builder(isolate);
builder.AppendCString("Symbol(");
if (symbol->name()->IsString()) {
builder.AppendString(handle(String::cast(symbol->name()), isolate));
}
builder.AppendCharacter(')');
return builder.Finish().ToHandleChecked();
} else if (input->IsJSReceiver()) {
// -- J S R e c e i v e r
Handle<JSReceiver> receiver = Handle<JSReceiver>::cast(input);
Handle<Object> to_string = JSReceiver::GetDataProperty(
receiver, isolate->factory()->toString_string());
if (IsErrorObject(isolate, input) ||
*to_string == *isolate->error_to_string()) {
// When internally formatting error objects, use a side-effects-free
// version of Error.prototype.toString independent of the actually
// installed toString method.
return NoSideEffectsErrorToString(isolate, input);
} else if (*to_string == *isolate->object_to_string()) {
Handle<Object> ctor = JSReceiver::GetDataProperty(
receiver, isolate->factory()->constructor_string());
if (ctor->IsFunction()) {
Handle<String> ctor_name;
if (ctor->IsJSBoundFunction()) {
ctor_name = JSBoundFunction::GetName(
isolate, Handle<JSBoundFunction>::cast(ctor))
.ToHandleChecked();
} else if (ctor->IsJSFunction()) {
Handle<Object> ctor_name_obj =
JSFunction::GetName(isolate, Handle<JSFunction>::cast(ctor));
ctor_name = AsStringOrEmpty(isolate, ctor_name_obj);
}
if (ctor_name->length() != 0) {
IncrementalStringBuilder builder(isolate);
builder.AppendCString("#<");
builder.AppendString(ctor_name);
builder.AppendCString(">");
return builder.Finish().ToHandleChecked();
}
}
}
}
// At this point, input is either none of the above or a JSReceiver.
Handle<JSReceiver> receiver;
if (input->IsJSReceiver()) {
receiver = Handle<JSReceiver>::cast(input);
} else {
// This is the only case where Object::ToObject throws.
DCHECK(!input->IsSmi());
int constructor_function_index =
Handle<HeapObject>::cast(input)->map()->GetConstructorFunctionIndex();
if (constructor_function_index == Map::kNoConstructorFunctionIndex) {
return isolate->factory()->NewStringFromAsciiChecked("[object Unknown]");
}
receiver = Object::ToObject(isolate, input, isolate->native_context())
.ToHandleChecked();
}
Handle<String> builtin_tag = handle(receiver->class_name(), isolate);
Handle<Object> tag_obj = JSReceiver::GetDataProperty(
receiver, isolate->factory()->to_string_tag_symbol());
Handle<String> tag =
tag_obj->IsString() ? Handle<String>::cast(tag_obj) : builtin_tag;
IncrementalStringBuilder builder(isolate);
builder.AppendCString("[object ");
builder.AppendString(tag);
builder.AppendCString("]");
return builder.Finish().ToHandleChecked();
}
// static
MaybeHandle<Object> Object::ConvertToLength(Isolate* isolate,
Handle<Object> input) {
ASSIGN_RETURN_ON_EXCEPTION(isolate, input, ToNumber(input), Object);
if (input->IsSmi()) {
int value = std::max(Smi::cast(*input)->value(), 0);
return handle(Smi::FromInt(value), isolate);
}
double len = DoubleToInteger(input->Number());
if (len <= 0.0) {
return handle(Smi::kZero, isolate);
} else if (len >= kMaxSafeInteger) {
len = kMaxSafeInteger;
}
return isolate->factory()->NewNumber(len);
}
// static
MaybeHandle<Object> Object::ConvertToIndex(
Isolate* isolate, Handle<Object> input,
MessageTemplate::Template error_index) {
if (input->IsUndefined(isolate)) return handle(Smi::kZero, isolate);
ASSIGN_RETURN_ON_EXCEPTION(isolate, input, ToNumber(input), Object);
if (input->IsSmi() && Smi::cast(*input)->value() >= 0) return input;
double len = DoubleToInteger(input->Number()) + 0.0;
auto js_len = isolate->factory()->NewNumber(len);
if (len < 0.0 || len > kMaxSafeInteger) {
THROW_NEW_ERROR(isolate, NewRangeError(error_index, js_len), Object);
}
return js_len;
}
bool Object::BooleanValue() {
if (IsSmi()) return Smi::cast(this)->value() != 0;
DCHECK(IsHeapObject());
Isolate* isolate = HeapObject::cast(this)->GetIsolate();
if (IsBoolean()) return IsTrue(isolate);
if (IsNullOrUndefined(isolate)) return false;
if (IsUndetectable()) return false; // Undetectable object is false.
if (IsString()) return String::cast(this)->length() != 0;
if (IsHeapNumber()) return HeapNumber::cast(this)->HeapNumberBooleanValue();
return true;
}
namespace {
// TODO(bmeurer): Maybe we should introduce a marker interface Number,
// where we put all these methods at some point?
ComparisonResult NumberCompare(double x, double y) {
if (std::isnan(x) || std::isnan(y)) {
return ComparisonResult::kUndefined;
} else if (x < y) {
return ComparisonResult::kLessThan;
} else if (x > y) {
return ComparisonResult::kGreaterThan;
} else {
return ComparisonResult::kEqual;
}
}
bool NumberEquals(double x, double y) {
// Must check explicitly for NaN's on Windows, but -0 works fine.
if (std::isnan(x)) return false;
if (std::isnan(y)) return false;
return x == y;
}
bool NumberEquals(const Object* x, const Object* y) {
return NumberEquals(x->Number(), y->Number());
}
bool NumberEquals(Handle<Object> x, Handle<Object> y) {
return NumberEquals(*x, *y);
}
} // namespace
// static
Maybe<ComparisonResult> Object::Compare(Handle<Object> x, Handle<Object> y) {
// ES6 section 7.2.11 Abstract Relational Comparison step 3 and 4.
if (!Object::ToPrimitive(x, ToPrimitiveHint::kNumber).ToHandle(&x) ||
!Object::ToPrimitive(y, ToPrimitiveHint::kNumber).ToHandle(&y)) {
return Nothing<ComparisonResult>();
}
if (x->IsString() && y->IsString()) {
// ES6 section 7.2.11 Abstract Relational Comparison step 5.
return Just(
String::Compare(Handle<String>::cast(x), Handle<String>::cast(y)));
}
// ES6 section 7.2.11 Abstract Relational Comparison step 6.
if (!Object::ToNumber(x).ToHandle(&x) || !Object::ToNumber(y).ToHandle(&y)) {
return Nothing<ComparisonResult>();
}
return Just(NumberCompare(x->Number(), y->Number()));
}
// static
Maybe<bool> Object::Equals(Handle<Object> x, Handle<Object> y) {
// This is the generic version of Abstract Equality Comparison; a version in
// JavaScript land is available in the EqualStub and NotEqualStub. Whenever
// you change something functionality wise in here, remember to update the
// TurboFan code stubs as well.
while (true) {
if (x->IsNumber()) {
if (y->IsNumber()) {
return Just(NumberEquals(x, y));
} else if (y->IsBoolean()) {
return Just(NumberEquals(*x, Handle<Oddball>::cast(y)->to_number()));
} else if (y->IsString()) {
return Just(NumberEquals(x, String::ToNumber(Handle<String>::cast(y))));
} else if (y->IsJSReceiver()) {
if (!JSReceiver::ToPrimitive(Handle<JSReceiver>::cast(y))
.ToHandle(&y)) {
return Nothing<bool>();
}
} else {
return Just(false);
}
} else if (x->IsString()) {
if (y->IsString()) {
return Just(
String::Equals(Handle<String>::cast(x), Handle<String>::cast(y)));
} else if (y->IsNumber()) {
x = String::ToNumber(Handle<String>::cast(x));
return Just(NumberEquals(x, y));
} else if (y->IsBoolean()) {
x = String::ToNumber(Handle<String>::cast(x));
return Just(NumberEquals(*x, Handle<Oddball>::cast(y)->to_number()));
} else if (y->IsJSReceiver()) {
if (!JSReceiver::ToPrimitive(Handle<JSReceiver>::cast(y))
.ToHandle(&y)) {
return Nothing<bool>();
}
} else {
return Just(false);
}
} else if (x->IsBoolean()) {
if (y->IsOddball()) {
return Just(x.is_identical_to(y));
} else if (y->IsNumber()) {
return Just(NumberEquals(Handle<Oddball>::cast(x)->to_number(), *y));
} else if (y->IsString()) {
y = String::ToNumber(Handle<String>::cast(y));
return Just(NumberEquals(Handle<Oddball>::cast(x)->to_number(), *y));
} else if (y->IsJSReceiver()) {
if (!JSReceiver::ToPrimitive(Handle<JSReceiver>::cast(y))
.ToHandle(&y)) {
return Nothing<bool>();
}
x = Oddball::ToNumber(Handle<Oddball>::cast(x));
} else {
return Just(false);
}
} else if (x->IsSymbol()) {
if (y->IsSymbol()) {
return Just(x.is_identical_to(y));
} else if (y->IsJSReceiver()) {
if (!JSReceiver::ToPrimitive(Handle<JSReceiver>::cast(y))
.ToHandle(&y)) {
return Nothing<bool>();
}
} else {
return Just(false);
}
} else if (x->IsJSReceiver()) {
if (y->IsJSReceiver()) {
return Just(x.is_identical_to(y));
} else if (y->IsUndetectable()) {
return Just(x->IsUndetectable());
} else if (y->IsBoolean()) {
y = Oddball::ToNumber(Handle<Oddball>::cast(y));
} else if (!JSReceiver::ToPrimitive(Handle<JSReceiver>::cast(x))
.ToHandle(&x)) {
return Nothing<bool>();
}
} else {
return Just(x->IsUndetectable() && y->IsUndetectable());
}
}
}
bool Object::StrictEquals(Object* that) {
if (this->IsNumber()) {
if (!that->IsNumber()) return false;
return NumberEquals(this, that);
} else if (this->IsString()) {
if (!that->IsString()) return false;
return String::cast(this)->Equals(String::cast(that));
}
return this == that;
}
// static
Handle<String> Object::TypeOf(Isolate* isolate, Handle<Object> object) {
if (object->IsNumber()) return isolate->factory()->number_string();
if (object->IsOddball()) return handle(Oddball::cast(*object)->type_of());
if (object->IsUndetectable()) {
return isolate->factory()->undefined_string();
}
if (object->IsString()) return isolate->factory()->string_string();
if (object->IsSymbol()) return isolate->factory()->symbol_string();
if (object->IsString()) return isolate->factory()->string_string();
if (object->IsCallable()) return isolate->factory()->function_string();
return isolate->factory()->object_string();
}
// static
MaybeHandle<Object> Object::Multiply(Isolate* isolate, Handle<Object> lhs,
Handle<Object> rhs) {
if (!lhs->IsNumber() || !rhs->IsNumber()) {
ASSIGN_RETURN_ON_EXCEPTION(isolate, lhs, Object::ToNumber(lhs), Object);
ASSIGN_RETURN_ON_EXCEPTION(isolate, rhs, Object::ToNumber(rhs), Object);
}
return isolate->factory()->NewNumber(lhs->Number() * rhs->Number());
}
// static
MaybeHandle<Object> Object::Divide(Isolate* isolate, Handle<Object> lhs,
Handle<Object> rhs) {
if (!lhs->IsNumber() || !rhs->IsNumber()) {
ASSIGN_RETURN_ON_EXCEPTION(isolate, lhs, Object::ToNumber(lhs), Object);
ASSIGN_RETURN_ON_EXCEPTION(isolate, rhs, Object::ToNumber(rhs), Object);
}
return isolate->factory()->NewNumber(lhs->Number() / rhs->Number());
}
// static
MaybeHandle<Object> Object::Modulus(Isolate* isolate, Handle<Object> lhs,
Handle<Object> rhs) {
if (!lhs->IsNumber() || !rhs->IsNumber()) {
ASSIGN_RETURN_ON_EXCEPTION(isolate, lhs, Object::ToNumber(lhs), Object);
ASSIGN_RETURN_ON_EXCEPTION(isolate, rhs, Object::ToNumber(rhs), Object);
}
return isolate->factory()->NewNumber(modulo(lhs->Number(), rhs->Number()));
}
// static
MaybeHandle<Object> Object::Add(Isolate* isolate, Handle<Object> lhs,
Handle<Object> rhs) {
if (lhs->IsNumber() && rhs->IsNumber()) {
return isolate->factory()->NewNumber(lhs->Number() + rhs->Number());
} else if (lhs->IsString() && rhs->IsString()) {
return isolate->factory()->NewConsString(Handle<String>::cast(lhs),
Handle<String>::cast(rhs));
}
ASSIGN_RETURN_ON_EXCEPTION(isolate, lhs, Object::ToPrimitive(lhs), Object);
ASSIGN_RETURN_ON_EXCEPTION(isolate, rhs, Object::ToPrimitive(rhs), Object);
if (lhs->IsString() || rhs->IsString()) {
ASSIGN_RETURN_ON_EXCEPTION(isolate, rhs, Object::ToString(isolate, rhs),
Object);
ASSIGN_RETURN_ON_EXCEPTION(isolate, lhs, Object::ToString(isolate, lhs),
Object);
return isolate->factory()->NewConsString(Handle<String>::cast(lhs),
Handle<String>::cast(rhs));
}
ASSIGN_RETURN_ON_EXCEPTION(isolate, rhs, Object::ToNumber(rhs), Object);
ASSIGN_RETURN_ON_EXCEPTION(isolate, lhs, Object::ToNumber(lhs), Object);
return isolate->factory()->NewNumber(lhs->Number() + rhs->Number());
}
// static
MaybeHandle<Object> Object::Subtract(Isolate* isolate, Handle<Object> lhs,
Handle<Object> rhs) {
if (!lhs->IsNumber() || !rhs->IsNumber()) {
ASSIGN_RETURN_ON_EXCEPTION(isolate, lhs, Object::ToNumber(lhs), Object);
ASSIGN_RETURN_ON_EXCEPTION(isolate, rhs, Object::ToNumber(rhs), Object);
}
return isolate->factory()->NewNumber(lhs->Number() - rhs->Number());
}
// static
MaybeHandle<Object> Object::ShiftLeft(Isolate* isolate, Handle<Object> lhs,
Handle<Object> rhs) {
if (!lhs->IsNumber() || !rhs->IsNumber()) {
ASSIGN_RETURN_ON_EXCEPTION(isolate, lhs, Object::ToNumber(lhs), Object);
ASSIGN_RETURN_ON_EXCEPTION(isolate, rhs, Object::ToNumber(rhs), Object);
}
return isolate->factory()->NewNumberFromInt(NumberToInt32(*lhs)
<< (NumberToUint32(*rhs) & 0x1F));
}
// static
MaybeHandle<Object> Object::ShiftRight(Isolate* isolate, Handle<Object> lhs,
Handle<Object> rhs) {
if (!lhs->IsNumber() || !rhs->IsNumber()) {
ASSIGN_RETURN_ON_EXCEPTION(isolate, lhs, Object::ToNumber(lhs), Object);
ASSIGN_RETURN_ON_EXCEPTION(isolate, rhs, Object::ToNumber(rhs), Object);
}
return isolate->factory()->NewNumberFromInt(NumberToInt32(*lhs) >>
(NumberToUint32(*rhs) & 0x1F));
}
// static
MaybeHandle<Object> Object::ShiftRightLogical(Isolate* isolate,
Handle<Object> lhs,
Handle<Object> rhs) {
if (!lhs->IsNumber() || !rhs->IsNumber()) {
ASSIGN_RETURN_ON_EXCEPTION(isolate, lhs, Object::ToNumber(lhs), Object);
ASSIGN_RETURN_ON_EXCEPTION(isolate, rhs, Object::ToNumber(rhs), Object);
}
return isolate->factory()->NewNumberFromUint(NumberToUint32(*lhs) >>
(NumberToUint32(*rhs) & 0x1F));
}
// static
MaybeHandle<Object> Object::BitwiseAnd(Isolate* isolate, Handle<Object> lhs,
Handle<Object> rhs) {
if (!lhs->IsNumber() || !rhs->IsNumber()) {
ASSIGN_RETURN_ON_EXCEPTION(isolate, lhs, Object::ToNumber(lhs), Object);
ASSIGN_RETURN_ON_EXCEPTION(isolate, rhs, Object::ToNumber(rhs), Object);
}
return isolate->factory()->NewNumberFromInt(NumberToInt32(*lhs) &
NumberToInt32(*rhs));
}
// static
MaybeHandle<Object> Object::BitwiseOr(Isolate* isolate, Handle<Object> lhs,
Handle<Object> rhs) {
if (!lhs->IsNumber() || !rhs->IsNumber()) {
ASSIGN_RETURN_ON_EXCEPTION(isolate, lhs, Object::ToNumber(lhs), Object);
ASSIGN_RETURN_ON_EXCEPTION(isolate, rhs, Object::ToNumber(rhs), Object);
}
return isolate->factory()->NewNumberFromInt(NumberToInt32(*lhs) |
NumberToInt32(*rhs));
}
// static
MaybeHandle<Object> Object::BitwiseXor(Isolate* isolate, Handle<Object> lhs,
Handle<Object> rhs) {
if (!lhs->IsNumber() || !rhs->IsNumber()) {
ASSIGN_RETURN_ON_EXCEPTION(isolate, lhs, Object::ToNumber(lhs), Object);
ASSIGN_RETURN_ON_EXCEPTION(isolate, rhs, Object::ToNumber(rhs), Object);
}
return isolate->factory()->NewNumberFromInt(NumberToInt32(*lhs) ^
NumberToInt32(*rhs));
}
// static
MaybeHandle<Object> Object::OrdinaryHasInstance(Isolate* isolate,
Handle<Object> callable,
Handle<Object> object) {
// The {callable} must have a [[Call]] internal method.
if (!callable->IsCallable()) return isolate->factory()->false_value();
// Check if {callable} is a bound function, and if so retrieve its
// [[BoundTargetFunction]] and use that instead of {callable}.
if (callable->IsJSBoundFunction()) {
Handle<Object> bound_callable(
Handle<JSBoundFunction>::cast(callable)->bound_target_function(),
isolate);
return Object::InstanceOf(isolate, object, bound_callable);
}
// If {object} is not a receiver, return false.
if (!object->IsJSReceiver()) return isolate->factory()->false_value();
// Get the "prototype" of {callable}; raise an error if it's not a receiver.
Handle<Object> prototype;
ASSIGN_RETURN_ON_EXCEPTION(
isolate, prototype,
Object::GetProperty(callable, isolate->factory()->prototype_string()),
Object);
if (!prototype->IsJSReceiver()) {
THROW_NEW_ERROR(
isolate,
NewTypeError(MessageTemplate::kInstanceofNonobjectProto, prototype),
Object);
}
// Return whether or not {prototype} is in the prototype chain of {object}.
Maybe<bool> result = JSReceiver::HasInPrototypeChain(
isolate, Handle<JSReceiver>::cast(object), prototype);
if (result.IsNothing()) return MaybeHandle<Object>();
return isolate->factory()->ToBoolean(result.FromJust());
}
// static
MaybeHandle<Object> Object::InstanceOf(Isolate* isolate, Handle<Object> object,
Handle<Object> callable) {
// The {callable} must be a receiver.
if (!callable->IsJSReceiver()) {
THROW_NEW_ERROR(isolate,
NewTypeError(MessageTemplate::kNonObjectInInstanceOfCheck),
Object);
}
// Lookup the @@hasInstance method on {callable}.
Handle<Object> inst_of_handler;
ASSIGN_RETURN_ON_EXCEPTION(
isolate, inst_of_handler,
JSReceiver::GetMethod(Handle<JSReceiver>::cast(callable),
isolate->factory()->has_instance_symbol()),
Object);
if (!inst_of_handler->IsUndefined(isolate)) {
// Call the {inst_of_handler} on the {callable}.
Handle<Object> result;
ASSIGN_RETURN_ON_EXCEPTION(
isolate, result,
Execution::Call(isolate, inst_of_handler, callable, 1, &object),
Object);
return isolate->factory()->ToBoolean(result->BooleanValue());
}
// The {callable} must have a [[Call]] internal method.
if (!callable->IsCallable()) {
THROW_NEW_ERROR(
isolate, NewTypeError(MessageTemplate::kNonCallableInInstanceOfCheck),
Object);
}
// Fall back to OrdinaryHasInstance with {callable} and {object}.
Handle<Object> result;
ASSIGN_RETURN_ON_EXCEPTION(
isolate, result,
JSReceiver::OrdinaryHasInstance(isolate, callable, object), Object);
return result;
}
Maybe<bool> Object::IsArray(Handle<Object> object) {
if (object->IsJSArray()) return Just(true);
if (object->IsJSProxy()) {
Handle<JSProxy> proxy = Handle<JSProxy>::cast(object);
Isolate* isolate = proxy->GetIsolate();
if (proxy->IsRevoked()) {
isolate->Throw(*isolate->factory()->NewTypeError(
MessageTemplate::kProxyRevoked,
isolate->factory()->NewStringFromAsciiChecked("IsArray")));
return Nothing<bool>();
}
return Object::IsArray(handle(proxy->target(), isolate));
}
return Just(false);
}
// static
MaybeHandle<Object> Object::GetMethod(Handle<JSReceiver> receiver,
Handle<Name> name) {
Handle<Object> func;
Isolate* isolate = receiver->GetIsolate();
ASSIGN_RETURN_ON_EXCEPTION(isolate, func,
JSReceiver::GetProperty(receiver, name), Object);
if (func->IsNullOrUndefined(isolate)) {
return isolate->factory()->undefined_value();
}
if (!func->IsCallable()) {
THROW_NEW_ERROR(isolate, NewTypeError(MessageTemplate::kPropertyNotFunction,
func, name, receiver),
Object);
}
return func;
}
namespace {
MaybeHandle<FixedArray> CreateListFromArrayLikeFastPath(
Isolate* isolate, Handle<Object> object, ElementTypes element_types) {
if (element_types != ElementTypes::kAll || !object->IsJSArray()) {
return MaybeHandle<FixedArray>();
}
Handle<JSArray> array = Handle<JSArray>::cast(object);
uint32_t length;
if (!array->HasArrayPrototype(isolate) ||
!array->length()->ToUint32(&length) || !array->HasFastElements() ||
!JSObject::PrototypeHasNoElements(isolate, *array)) {
return MaybeHandle<FixedArray>();
}
return array->GetElementsAccessor()->CreateListFromArray(isolate, array);
}
} // namespace
// static
MaybeHandle<FixedArray> Object::CreateListFromArrayLike(
Isolate* isolate, Handle<Object> object, ElementTypes element_types) {
// Fast-path for JS_ARRAY_TYPE.
MaybeHandle<FixedArray> fast_result =
CreateListFromArrayLikeFastPath(isolate, object, element_types);
if (!fast_result.is_null()) return fast_result;
// 1. ReturnIfAbrupt(object).
// 2. (default elementTypes -- not applicable.)
// 3. If Type(obj) is not Object, throw a TypeError exception.
if (!object->IsJSReceiver()) {
THROW_NEW_ERROR(isolate,
NewTypeError(MessageTemplate::kCalledOnNonObject,
isolate->factory()->NewStringFromAsciiChecked(
"CreateListFromArrayLike")),
FixedArray);
}
// 4. Let len be ? ToLength(? Get(obj, "length")).
Handle<JSReceiver> receiver = Handle<JSReceiver>::cast(object);
Handle<Object> raw_length_number;
ASSIGN_RETURN_ON_EXCEPTION(isolate, raw_length_number,
Object::GetLengthFromArrayLike(isolate, receiver),
FixedArray);
uint32_t len;
if (!raw_length_number->ToUint32(&len) ||
len > static_cast<uint32_t>(FixedArray::kMaxLength)) {
THROW_NEW_ERROR(isolate,
NewRangeError(MessageTemplate::kInvalidArrayLength),
FixedArray);
}
// 5. Let list be an empty List.
Handle<FixedArray> list = isolate->factory()->NewFixedArray(len);
// 6. Let index be 0.
// 7. Repeat while index < len:
for (uint32_t index = 0; index < len; ++index) {
// 7a. Let indexName be ToString(index).
// 7b. Let next be ? Get(obj, indexName).
Handle<Object> next;
ASSIGN_RETURN_ON_EXCEPTION(isolate, next,
JSReceiver::GetElement(isolate, receiver, index),
FixedArray);
switch (element_types) {
case ElementTypes::kAll:
// Nothing to do.
break;
case ElementTypes::kStringAndSymbol: {
// 7c. If Type(next) is not an element of elementTypes, throw a
// TypeError exception.
if (!next->IsName()) {
THROW_NEW_ERROR(isolate,
NewTypeError(MessageTemplate::kNotPropertyName, next),
FixedArray);
}
// 7d. Append next as the last element of list.
// Internalize on the fly so we can use pointer identity later.
next = isolate->factory()->InternalizeName(Handle<Name>::cast(next));
break;
}
}
list->set(index, *next);
// 7e. Set index to index + 1. (See loop header.)
}
// 8. Return list.
return list;
}
// static
MaybeHandle<Object> Object::GetLengthFromArrayLike(Isolate* isolate,
Handle<Object> object) {
Handle<Object> val;
Handle<Object> key = isolate->factory()->length_string();
ASSIGN_RETURN_ON_EXCEPTION(
isolate, val, Runtime::GetObjectProperty(isolate, object, key), Object);
return Object::ToLength(isolate, val);
}
// static
Maybe<bool> JSReceiver::HasProperty(LookupIterator* it) {
for (; it->IsFound(); it->Next()) {
switch (it->state()) {
case LookupIterator::NOT_FOUND:
case LookupIterator::TRANSITION:
UNREACHABLE();
case LookupIterator::JSPROXY:
return JSProxy::HasProperty(it->isolate(), it->GetHolder<JSProxy>(),
it->GetName());
case LookupIterator::INTERCEPTOR: {
Maybe<PropertyAttributes> result =
JSObject::GetPropertyAttributesWithInterceptor(it);
if (result.IsNothing()) return Nothing<bool>();
if (result.FromJust() != ABSENT) return Just(true);
break;
}
case LookupIterator::ACCESS_CHECK: {
if (it->HasAccess()) break;
Maybe<PropertyAttributes> result =
JSObject::GetPropertyAttributesWithFailedAccessCheck(it);
if (result.IsNothing()) return Nothing<bool>();
return Just(result.FromJust() != ABSENT);
}
case LookupIterator::INTEGER_INDEXED_EXOTIC:
// TypedArray out-of-bounds access.
return Just(false);
case LookupIterator::ACCESSOR:
case LookupIterator::DATA:
return Just(true);
}
}
return Just(false);
}
// static
MaybeHandle<Object> Object::GetProperty(LookupIterator* it) {
for (; it->IsFound(); it->Next()) {
switch (it->state()) {
case LookupIterator::NOT_FOUND:
case LookupIterator::TRANSITION:
UNREACHABLE();
case LookupIterator::JSPROXY: {
bool was_found;
MaybeHandle<Object> result =
JSProxy::GetProperty(it->isolate(), it->GetHolder<JSProxy>(),
it->GetName(), it->GetReceiver(), &was_found);
if (!was_found) it->NotFound();
return result;
}
case LookupIterator::INTERCEPTOR: {
bool done;
Handle<Object> result;
ASSIGN_RETURN_ON_EXCEPTION(
it->isolate(), result,
JSObject::GetPropertyWithInterceptor(it, &done), Object);
if (done) return result;
break;
}
case LookupIterator::ACCESS_CHECK:
if (it->HasAccess()) break;
return JSObject::GetPropertyWithFailedAccessCheck(it);
case LookupIterator::ACCESSOR:
return GetPropertyWithAccessor(it);
case LookupIterator::INTEGER_INDEXED_EXOTIC:
return it->isolate()->factory()->undefined_value();
case LookupIterator::DATA:
return it->GetDataValue();
}
}
return it->isolate()->factory()->undefined_value();
}
// static
MaybeHandle<Object> JSProxy::GetProperty(Isolate* isolate,
Handle<JSProxy> proxy,
Handle<Name> name,
Handle<Object> receiver,
bool* was_found) {
*was_found = true;
if (receiver->IsJSGlobalObject()) {
THROW_NEW_ERROR(
isolate,
NewTypeError(MessageTemplate::kReadGlobalReferenceThroughProxy, name),
Object);
}
DCHECK(!name->IsPrivate());
STACK_CHECK(isolate, MaybeHandle<Object>());
Handle<Name> trap_name = isolate->factory()->get_string();
// 1. Assert: IsPropertyKey(P) is true.
// 2. Let handler be the value of the [[ProxyHandler]] internal slot of O.
Handle<Object> handler(proxy->handler(), isolate);
// 3. If handler is null, throw a TypeError exception.
// 4. Assert: Type(handler) is Object.
if (proxy->IsRevoked()) {
THROW_NEW_ERROR(isolate,
NewTypeError(MessageTemplate::kProxyRevoked, trap_name),
Object);
}
// 5. Let target be the value of the [[ProxyTarget]] internal slot of O.
Handle<JSReceiver> target(proxy->target(), isolate);
// 6. Let trap be ? GetMethod(handler, "get").
Handle<Object> trap;
ASSIGN_RETURN_ON_EXCEPTION(
isolate, trap,
Object::GetMethod(Handle<JSReceiver>::cast(handler), trap_name), Object);
// 7. If trap is undefined, then
if (trap->IsUndefined(isolate)) {
// 7.a Return target.[[Get]](P, Receiver).
LookupIterator it =
LookupIterator::PropertyOrElement(isolate, receiver, name, target);
MaybeHandle<Object> result = Object::GetProperty(&it);
*was_found = it.IsFound();
return result;
}
// 8. Let trapResult be ? Call(trap, handler, «target, P, Receiver»).
Handle<Object> trap_result;
Handle<Object> args[] = {target, name, receiver};
ASSIGN_RETURN_ON_EXCEPTION(
isolate, trap_result,
Execution::Call(isolate, trap, handler, arraysize(args), args), Object);
// 9. Let targetDesc be ? target.[[GetOwnProperty]](P).
PropertyDescriptor target_desc;
Maybe<bool> target_found =
JSReceiver::GetOwnPropertyDescriptor(isolate, target, name, &target_desc);
MAYBE_RETURN_NULL(target_found);
// 10. If targetDesc is not undefined, then
if (target_found.FromJust()) {
// 10.a. If IsDataDescriptor(targetDesc) and targetDesc.[[Configurable]] is
// false and targetDesc.[[Writable]] is false, then
// 10.a.i. If SameValue(trapResult, targetDesc.[[Value]]) is false,
// throw a TypeError exception.
bool inconsistent = PropertyDescriptor::IsDataDescriptor(&target_desc) &&
!target_desc.configurable() &&
!target_desc.writable() &&
!trap_result->SameValue(*target_desc.value());
if (inconsistent) {
THROW_NEW_ERROR(
isolate, NewTypeError(MessageTemplate::kProxyGetNonConfigurableData,
name, target_desc.value(), trap_result),
Object);
}
// 10.b. If IsAccessorDescriptor(targetDesc) and targetDesc.[[Configurable]]
// is false and targetDesc.[[Get]] is undefined, then
// 10.b.i. If trapResult is not undefined, throw a TypeError exception.
inconsistent = PropertyDescriptor::IsAccessorDescriptor(&target_desc) &&
!target_desc.configurable() &&
target_desc.get()->IsUndefined(isolate) &&
!trap_result->IsUndefined(isolate);
if (inconsistent) {
THROW_NEW_ERROR(
isolate,
NewTypeError(MessageTemplate::kProxyGetNonConfigurableAccessor, name,
trap_result),
Object);
}
}
// 11. Return trap_result
return trap_result;
}
Handle<Object> JSReceiver::GetDataProperty(LookupIterator* it) {
for (; it->IsFound(); it->Next()) {
switch (it->state()) {
case LookupIterator::INTERCEPTOR:
case LookupIterator::NOT_FOUND:
case LookupIterator::TRANSITION:
UNREACHABLE();
case LookupIterator::ACCESS_CHECK:
// Support calling this method without an active context, but refuse
// access to access-checked objects in that case.
if (it->isolate()->context() != nullptr && it->HasAccess()) continue;
// Fall through.
case LookupIterator::JSPROXY:
it->NotFound();
return it->isolate()->factory()->undefined_value();
case LookupIterator::ACCESSOR:
// TODO(verwaest): For now this doesn't call into AccessorInfo, since
// clients don't need it. Update once relevant.
it->NotFound();
return it->isolate()->factory()->undefined_value();
case LookupIterator::INTEGER_INDEXED_EXOTIC:
return it->isolate()->factory()->undefined_value();
case LookupIterator::DATA:
return it->GetDataValue();
}
}
return it->isolate()->factory()->undefined_value();
}
bool Object::ToInt32(int32_t* value) {
if (IsSmi()) {
*value = Smi::cast(this)->value();
return true;
}
if (IsHeapNumber()) {
double num = HeapNumber::cast(this)->value();
if (FastI2D(FastD2I(num)) == num) {
*value = FastD2I(num);
return true;
}
}
return false;
}
Handle<SharedFunctionInfo> FunctionTemplateInfo::GetOrCreateSharedFunctionInfo(
Isolate* isolate, Handle<FunctionTemplateInfo> info) {
Object* current_info = info->shared_function_info();
if (current_info->IsSharedFunctionInfo()) {
return handle(SharedFunctionInfo::cast(current_info), isolate);
}
Handle<Object> class_name(info->class_name(), isolate);
Handle<String> name = class_name->IsString()
? Handle<String>::cast(class_name)
: isolate->factory()->empty_string();
Handle<Code> code;
if (info->call_code()->IsCallHandlerInfo() &&
CallHandlerInfo::cast(info->call_code())->fast_handler()->IsCode()) {
code = isolate->builtins()->HandleFastApiCall();
} else {
code = isolate->builtins()->HandleApiCall();
}
bool is_constructor = !info->remove_prototype();
Handle<SharedFunctionInfo> result =
isolate->factory()->NewSharedFunctionInfo(name, code, is_constructor);
if (is_constructor) {
result->SetConstructStub(*isolate->builtins()->JSConstructStubApi());
}
result->set_length(info->length());
if (class_name->IsString()) result->set_instance_class_name(*class_name);
result->set_api_func_data(*info);
result->DontAdaptArguments();
DCHECK(result->IsApiFunction());
info->set_shared_function_info(*result);
return result;
}
bool FunctionTemplateInfo::IsTemplateFor(Map* map) {
// There is a constraint on the object; check.
if (!map->IsJSObjectMap()) return false;
// Fetch the constructor function of the object.
Object* cons_obj = map->GetConstructor();
if (!cons_obj->IsJSFunction()) return false;
JSFunction* fun = JSFunction::cast(cons_obj);
// Iterate through the chain of inheriting function templates to
// see if the required one occurs.
for (Object* type = fun->shared()->function_data();
type->IsFunctionTemplateInfo();
type = FunctionTemplateInfo::cast(type)->parent_template()) {
if (type == this) return true;
}
// Didn't find the required type in the inheritance chain.
return false;
}
// static
Handle<TemplateList> TemplateList::New(Isolate* isolate, int size) {
Handle<FixedArray> list =
isolate->factory()->NewFixedArray(kLengthIndex + size);
list->set(kLengthIndex, Smi::kZero);
return Handle<TemplateList>::cast(list);
}
// static
Handle<TemplateList> TemplateList::Add(Isolate* isolate,
Handle<TemplateList> list,
Handle<i::Object> value) {
STATIC_ASSERT(kFirstElementIndex == 1);
int index = list->length() + 1;
Handle<i::FixedArray> fixed_array = Handle<FixedArray>::cast(list);
fixed_array = FixedArray::SetAndGrow(fixed_array, index, value);
fixed_array->set(kLengthIndex, Smi::FromInt(index));
return Handle<TemplateList>::cast(fixed_array);
}
// static
MaybeHandle<JSObject> JSObject::New(Handle<JSFunction> constructor,
Handle<JSReceiver> new_target,
Handle<AllocationSite> site) {
// If called through new, new.target can be:
// - a subclass of constructor,
// - a proxy wrapper around constructor, or
// - the constructor itself.
// If called through Reflect.construct, it's guaranteed to be a constructor.
Isolate* const isolate = constructor->GetIsolate();
DCHECK(constructor->IsConstructor());
DCHECK(new_target->IsConstructor());
DCHECK(!constructor->has_initial_map() ||
constructor->initial_map()->instance_type() != JS_FUNCTION_TYPE);
Handle<Map> initial_map;
ASSIGN_RETURN_ON_EXCEPTION(
isolate, initial_map,
JSFunction::GetDerivedMap(isolate, constructor, new_target), JSObject);
Handle<JSObject> result =
isolate->factory()->NewJSObjectFromMap(initial_map, NOT_TENURED, site);
isolate->counters()->constructed_objects()->Increment();
isolate->counters()->constructed_objects_runtime()->Increment();
return result;
}
void JSObject::EnsureWritableFastElements(Handle<JSObject> object) {
DCHECK(object->HasFastSmiOrObjectElements() ||
object->HasFastStringWrapperElements());
FixedArray* raw_elems = FixedArray::cast(object->elements());
Heap* heap = object->GetHeap();
if (raw_elems->map() != heap->fixed_cow_array_map()) return;
Isolate* isolate = heap->isolate();
Handle<FixedArray> elems(raw_elems, isolate);
Handle<FixedArray> writable_elems = isolate->factory()->CopyFixedArrayWithMap(
elems, isolate->factory()->fixed_array_map());
object->set_elements(*writable_elems);
isolate->counters()->cow_arrays_converted()->Increment();
}
// ES6 9.5.1
// static
MaybeHandle<Object> JSProxy::GetPrototype(Handle<JSProxy> proxy) {
Isolate* isolate = proxy->GetIsolate();
Handle<String> trap_name = isolate->factory()->getPrototypeOf_string();
STACK_CHECK(isolate, MaybeHandle<Object>());
// 1. Let handler be the value of the [[ProxyHandler]] internal slot.
// 2. If handler is null, throw a TypeError exception.
// 3. Assert: Type(handler) is Object.
// 4. Let target be the value of the [[ProxyTarget]] internal slot.
if (proxy->IsRevoked()) {
THROW_NEW_ERROR(isolate,
NewTypeError(MessageTemplate::kProxyRevoked, trap_name),
Object);
}
Handle<JSReceiver> target(proxy->target(), isolate);
Handle<JSReceiver> handler(JSReceiver::cast(proxy->handler()), isolate);
// 5. Let trap be ? GetMethod(handler, "getPrototypeOf").
Handle<Object> trap;
ASSIGN_RETURN_ON_EXCEPTION(isolate, trap, GetMethod(handler, trap_name),
Object);
// 6. If trap is undefined, then return target.[[GetPrototypeOf]]().
if (trap->IsUndefined(isolate)) {
return JSReceiver::GetPrototype(isolate, target);
}
// 7. Let handlerProto be ? Call(trap, handler, «target»).
Handle<Object> argv[] = {target};
Handle<Object> handler_proto;
ASSIGN_RETURN_ON_EXCEPTION(
isolate, handler_proto,
Execution::Call(isolate, trap, handler, arraysize(argv), argv), Object);
// 8. If Type(handlerProto) is neither Object nor Null, throw a TypeError.
if (!(handler_proto->IsJSReceiver() || handler_proto->IsNull(isolate))) {
THROW_NEW_ERROR(isolate,
NewTypeError(MessageTemplate::kProxyGetPrototypeOfInvalid),
Object);
}
// 9. Let extensibleTarget be ? IsExtensible(target).
Maybe<bool> is_extensible = JSReceiver::IsExtensible(target);
MAYBE_RETURN_NULL(is_extensible);
// 10. If extensibleTarget is true, return handlerProto.
if (is_extensible.FromJust()) return handler_proto;
// 11. Let targetProto be ? target.[[GetPrototypeOf]]().
Handle<Object> target_proto;
ASSIGN_RETURN_ON_EXCEPTION(isolate, target_proto,
JSReceiver::GetPrototype(isolate, target), Object);
// 12. If SameValue(handlerProto, targetProto) is false, throw a TypeError.
if (!handler_proto->SameValue(*target_proto)) {
THROW_NEW_ERROR(
isolate,
NewTypeError(MessageTemplate::kProxyGetPrototypeOfNonExtensible),
Object);
}
// 13. Return handlerProto.
return handler_proto;
}
MaybeHandle<Object> Object::GetPropertyWithAccessor(LookupIterator* it) {
Isolate* isolate = it->isolate();
Handle<Object> structure = it->GetAccessors();
Handle<Object> receiver = it->GetReceiver();
// We should never get here to initialize a const with the hole value since a
// const declaration would conflict with the getter.
DCHECK(!structure->IsForeign());
// API style callbacks.
if (structure->IsAccessorInfo()) {
Handle<JSObject> holder = it->GetHolder<JSObject>();
Handle<Name> name = it->GetName();
Handle<AccessorInfo> info = Handle<AccessorInfo>::cast(structure);
if (!info->IsCompatibleReceiver(*receiver)) {
THROW_NEW_ERROR(isolate,
NewTypeError(MessageTemplate::kIncompatibleMethodReceiver,
name, receiver),
Object);
}
v8::AccessorNameGetterCallback call_fun =
v8::ToCData<v8::AccessorNameGetterCallback>(info->getter());
if (call_fun == nullptr) return isolate->factory()->undefined_value();
if (info->is_sloppy() && !receiver->IsJSReceiver()) {
ASSIGN_RETURN_ON_EXCEPTION(isolate, receiver,
Object::ConvertReceiver(isolate, receiver),
Object);
}
PropertyCallbackArguments args(isolate, info->data(), *receiver, *holder,
Object::DONT_THROW);
Handle<Object> result = args.Call(call_fun, name);
RETURN_EXCEPTION_IF_SCHEDULED_EXCEPTION(isolate, Object);
if (result.is_null()) return isolate->factory()->undefined_value();
Handle<Object> reboxed_result = handle(*result, isolate);
if (info->replace_on_access() && receiver->IsJSReceiver()) {
args.Call(reinterpret_cast<GenericNamedPropertySetterCallback>(
&Accessors::ReconfigureToDataProperty),
name, result);
RETURN_EXCEPTION_IF_SCHEDULED_EXCEPTION(isolate, Object);
}
return reboxed_result;
}
// AccessorPair with 'cached' private property.
if (it->TryLookupCachedProperty()) {
return Object::GetProperty(it);
}
// Regular accessor.
Handle<Object> getter(AccessorPair::cast(*structure)->getter(), isolate);
if (getter->IsFunctionTemplateInfo()) {
return Builtins::InvokeApiFunction(
isolate, false, Handle<FunctionTemplateInfo>::cast(getter), receiver, 0,
nullptr, isolate->factory()->undefined_value());
} else if (getter->IsCallable()) {
// TODO(rossberg): nicer would be to cast to some JSCallable here...
return Object::GetPropertyWithDefinedGetter(
receiver, Handle<JSReceiver>::cast(getter));
}
// Getter is not a function.
return isolate->factory()->undefined_value();
}
// static
Address AccessorInfo::redirect(Isolate* isolate, Address address,
AccessorComponent component) {
ApiFunction fun(address);
DCHECK_EQ(ACCESSOR_GETTER, component);
ExternalReference::Type type = ExternalReference::DIRECT_GETTER_CALL;
return ExternalReference(&fun, type, isolate).address();
}
Address AccessorInfo::redirected_getter() const {
Address accessor = v8::ToCData<Address>(getter());
if (accessor == nullptr) return nullptr;
return redirect(GetIsolate(), accessor, ACCESSOR_GETTER);
}
bool AccessorInfo::IsCompatibleReceiverMap(Isolate* isolate,
Handle<AccessorInfo> info,
Handle<Map> map) {
if (!info->HasExpectedReceiverType()) return true;
if (!map->IsJSObjectMap()) return false;
return FunctionTemplateInfo::cast(info->expected_receiver_type())
->IsTemplateFor(*map);
}
Maybe<bool> Object::SetPropertyWithAccessor(LookupIterator* it,
Handle<Object> value,
ShouldThrow should_throw) {
Isolate* isolate = it->isolate();
Handle<Object> structure = it->GetAccessors();
Handle<Object> receiver = it->GetReceiver();
// We should never get here to initialize a const with the hole value since a
// const declaration would conflict with the setter.
DCHECK(!structure->IsForeign());
// API style callbacks.
if (structure->IsAccessorInfo()) {
Handle<JSObject> holder = it->GetHolder<JSObject>();
Handle<Name> name = it->GetName();
Handle<AccessorInfo> info = Handle<AccessorInfo>::cast(structure);
if (!info->IsCompatibleReceiver(*receiver)) {
isolate->Throw(*isolate->factory()->NewTypeError(
MessageTemplate::kIncompatibleMethodReceiver, name, receiver));
return Nothing<bool>();
}
// The actual type of call_fun is either v8::AccessorNameSetterCallback or
// i::Accesors::AccessorNameBooleanSetterCallback, depending on whether the
// AccessorInfo was created by the API or internally (see accessors.cc).
// Here we handle both cases using GenericNamedPropertySetterCallback and
// its Call method.
GenericNamedPropertySetterCallback call_fun =
v8::ToCData<GenericNamedPropertySetterCallback>(info->setter());
if (call_fun == nullptr) {
// TODO(verwaest): We should not get here anymore once all AccessorInfos
// are marked as special_data_property. They cannot both be writable and
// not have a setter.
return Just(true);
}
if (info->is_sloppy() && !receiver->IsJSReceiver()) {
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
isolate, receiver, Object::ConvertReceiver(isolate, receiver),
Nothing<bool>());
}
PropertyCallbackArguments args(isolate, info->data(), *receiver, *holder,
should_throw);
Handle<Object> result = args.Call(call_fun, name, value);
// In the case of AccessorNameSetterCallback, we know that the result value
// cannot have been set, so the result of Call will be null. In the case of
// AccessorNameBooleanSetterCallback, the result will either be null
// (signalling an exception) or a boolean Oddball.
RETURN_VALUE_IF_SCHEDULED_EXCEPTION(isolate, Nothing<bool>());
if (result.is_null()) return Just(true);
DCHECK(result->BooleanValue() || should_throw == DONT_THROW);
return Just(result->BooleanValue());
}
// Regular accessor.
Handle<Object> setter(AccessorPair::cast(*structure)->setter(), isolate);
if (setter->IsFunctionTemplateInfo()) {
Handle<Object> argv[] = {value};
RETURN_ON_EXCEPTION_VALUE(
isolate, Builtins::InvokeApiFunction(
isolate, false, Handle<FunctionTemplateInfo>::cast(setter),
receiver, arraysize(argv), argv,
isolate->factory()->undefined_value()),
Nothing<bool>());
return Just(true);
} else if (setter->IsCallable()) {
// TODO(rossberg): nicer would be to cast to some JSCallable here...
return SetPropertyWithDefinedSetter(
receiver, Handle<JSReceiver>::cast(setter), value, should_throw);
}
RETURN_FAILURE(isolate, should_throw,
NewTypeError(MessageTemplate::kNoSetterInCallback,
it->GetName(), it->GetHolder<JSObject>()));
}
MaybeHandle<Object> Object::GetPropertyWithDefinedGetter(
Handle<Object> receiver,
Handle<JSReceiver> getter) {
Isolate* isolate = getter->GetIsolate();
// Platforms with simulators like arm/arm64 expose a funny issue. If the
// simulator has a separate JS stack pointer from the C++ stack pointer, it
// can miss C++ stack overflows in the stack guard at the start of JavaScript
// functions. It would be very expensive to check the C++ stack pointer at
// that location. The best solution seems to be to break the impasse by
// adding checks at possible recursion points. What's more, we don't put
// this stack check behind the USE_SIMULATOR define in order to keep
// behavior the same between hardware and simulators.
StackLimitCheck check(isolate);
if (check.JsHasOverflowed()) {
isolate->StackOverflow();
return MaybeHandle<Object>();
}
return Execution::Call(isolate, getter, receiver, 0, NULL);
}
Maybe<bool> Object::SetPropertyWithDefinedSetter(Handle<Object> receiver,
Handle<JSReceiver> setter,
Handle<Object> value,
ShouldThrow should_throw) {
Isolate* isolate = setter->GetIsolate();
Handle<Object> argv[] = { value };
RETURN_ON_EXCEPTION_VALUE(isolate, Execution::Call(isolate, setter, receiver,
arraysize(argv), argv),
Nothing<bool>());
return Just(true);
}
// static
bool JSObject::AllCanRead(LookupIterator* it) {
// Skip current iteration, it's in state ACCESS_CHECK or INTERCEPTOR, both of
// which have already been checked.
DCHECK(it->state() == LookupIterator::ACCESS_CHECK ||
it->state() == LookupIterator::INTERCEPTOR);
for (it->Next(); it->IsFound(); it->Next()) {
if (it->state() == LookupIterator::ACCESSOR) {
auto accessors = it->GetAccessors();
if (accessors->IsAccessorInfo()) {
if (AccessorInfo::cast(*accessors)->all_can_read()) return true;
}
} else if (it->state() == LookupIterator::INTERCEPTOR) {
if (it->GetInterceptor()->all_can_read()) return true;
} else if (it->state() == LookupIterator::JSPROXY) {
// Stop lookupiterating. And no, AllCanNotRead.
return false;
}
}
return false;
}
namespace {
MaybeHandle<Object> GetPropertyWithInterceptorInternal(
LookupIterator* it, Handle<InterceptorInfo> interceptor, bool* done) {
*done = false;
Isolate* isolate = it->isolate();
// Make sure that the top context does not change when doing callbacks or
// interceptor calls.
AssertNoContextChange ncc(isolate);
if (interceptor->getter()->IsUndefined(isolate)) {
return isolate->factory()->undefined_value();
}
Handle<JSObject> holder = it->GetHolder<JSObject>();
Handle<Object> result;
Handle<Object> receiver = it->GetReceiver();
if (!receiver->IsJSReceiver()) {
ASSIGN_RETURN_ON_EXCEPTION(
isolate, receiver, Object::ConvertReceiver(isolate, receiver), Object);
}
PropertyCallbackArguments args(isolate, interceptor->data(), *receiver,
*holder, Object::DONT_THROW);
if (it->IsElement()) {
uint32_t index = it->index();
v8::IndexedPropertyGetterCallback getter =
v8::ToCData<v8::IndexedPropertyGetterCallback>(interceptor->getter());
result = args.Call(getter, index);
} else {
Handle<Name> name = it->name();
DCHECK(!name->IsPrivate());
if (name->IsSymbol() && !interceptor->can_intercept_symbols()) {
return isolate->factory()->undefined_value();
}
v8::GenericNamedPropertyGetterCallback getter =
v8::ToCData<v8::GenericNamedPropertyGetterCallback>(
interceptor->getter());
result = args.Call(getter, name);
}
RETURN_EXCEPTION_IF_SCHEDULED_EXCEPTION(isolate, Object);
if (result.is_null()) return isolate->factory()->undefined_value();
*done = true;
// Rebox handle before return
return handle(*result, isolate);
}
Maybe<PropertyAttributes> GetPropertyAttributesWithInterceptorInternal(
LookupIterator* it, Handle<InterceptorInfo> interceptor) {
Isolate* isolate = it->isolate();
// Make sure that the top context does not change when doing
// callbacks or interceptor calls.
AssertNoContextChange ncc(isolate);
HandleScope scope(isolate);
Handle<JSObject> holder = it->GetHolder<JSObject>();
if (!it->IsElement() && it->name()->IsSymbol() &&
!interceptor->can_intercept_symbols()) {
return Just(ABSENT);
}
Handle<Object> receiver = it->GetReceiver();
if (!receiver->IsJSReceiver()) {
ASSIGN_RETURN_ON_EXCEPTION_VALUE(isolate, receiver,
Object::ConvertReceiver(isolate, receiver),
Nothing<PropertyAttributes>());
}
PropertyCallbackArguments args(isolate, interceptor->data(), *receiver,
*holder, Object::DONT_THROW);
if (!interceptor->query()->IsUndefined(isolate)) {
Handle<Object> result;
if (it->IsElement()) {
uint32_t index = it->index();
v8::IndexedPropertyQueryCallback query =
v8::ToCData<v8::IndexedPropertyQueryCallback>(interceptor->query());
result = args.Call(query, index);
} else {
Handle<Name> name = it->name();
DCHECK(!name->IsPrivate());
v8::GenericNamedPropertyQueryCallback query =
v8::ToCData<v8::GenericNamedPropertyQueryCallback>(
interceptor->query());
result = args.Call(query, name);
}
if (!result.is_null()) {
int32_t value;
CHECK(result->ToInt32(&value));
return Just(static_cast<PropertyAttributes>(value));
}
} else if (!interceptor->getter()->IsUndefined(isolate)) {
// TODO(verwaest): Use GetPropertyWithInterceptor?
Handle<Object> result;
if (it->IsElement()) {
uint32_t index = it->index();
v8::IndexedPropertyGetterCallback getter =
v8::ToCData<v8::IndexedPropertyGetterCallback>(interceptor->getter());
result = args.Call(getter, index);
} else {
Handle<Name> name = it->name();
DCHECK(!name->IsPrivate());
v8::GenericNamedPropertyGetterCallback getter =
v8::ToCData<v8::GenericNamedPropertyGetterCallback>(
interceptor->getter());
result = args.Call(getter, name);
}
if (!result.is_null()) return Just(DONT_ENUM);
}
RETURN_VALUE_IF_SCHEDULED_EXCEPTION(isolate, Nothing<PropertyAttributes>());
return Just(ABSENT);
}
Maybe<bool> SetPropertyWithInterceptorInternal(
LookupIterator* it, Handle<InterceptorInfo> interceptor,
Object::ShouldThrow should_throw, Handle<Object> value) {
Isolate* isolate = it->isolate();
// Make sure that the top context does not change when doing callbacks or
// interceptor calls.
AssertNoContextChange ncc(isolate);
if (interceptor->setter()->IsUndefined(isolate)) return Just(false);
Handle<JSObject> holder = it->GetHolder<JSObject>();
bool result;
Handle<Object> receiver = it->GetReceiver();
if (!receiver->IsJSReceiver()) {
ASSIGN_RETURN_ON_EXCEPTION_VALUE(isolate, receiver,
Object::ConvertReceiver(isolate, receiver),
Nothing<bool>());
}
PropertyCallbackArguments args(isolate, interceptor->data(), *receiver,
*holder, should_throw);
if (it->IsElement()) {
uint32_t index = it->index();
v8::IndexedPropertySetterCallback setter =
v8::ToCData<v8::IndexedPropertySetterCallback>(interceptor->setter());
// TODO(neis): In the future, we may want to actually return the
// interceptor's result, which then should be a boolean.
result = !args.Call(setter, index, value).is_null();
} else {
Handle<Name> name = it->name();
DCHECK(!name->IsPrivate());
if (name->IsSymbol() && !interceptor->can_intercept_symbols()) {
return Just(false);
}
v8::GenericNamedPropertySetterCallback setter =
v8::ToCData<v8::GenericNamedPropertySetterCallback>(
interceptor->setter());
result = !args.Call(setter, name, value).is_null();
}
RETURN_VALUE_IF_SCHEDULED_EXCEPTION(it->isolate(), Nothing<bool>());
return Just(result);
}
Maybe<bool> DefinePropertyWithInterceptorInternal(
LookupIterator* it, Handle<InterceptorInfo> interceptor,
Object::ShouldThrow should_throw, PropertyDescriptor& desc) {
Isolate* isolate = it->isolate();
// Make sure that the top context does not change when doing callbacks or
// interceptor calls.
AssertNoContextChange ncc(isolate);
if (interceptor->definer()->IsUndefined(isolate)) return Just(false);
Handle<JSObject> holder = it->GetHolder<JSObject>();
bool result;
Handle<Object> receiver = it->GetReceiver();
if (!receiver->IsJSReceiver()) {
ASSIGN_RETURN_ON_EXCEPTION_VALUE(isolate, receiver,
Object::ConvertReceiver(isolate, receiver),
Nothing<bool>());
}
PropertyCallbackArguments args(isolate, interceptor->data(), *receiver,
*holder, should_throw);
std::unique_ptr<v8::PropertyDescriptor> descriptor(
new v8::PropertyDescriptor());
if (PropertyDescriptor::IsAccessorDescriptor(&desc)) {
descriptor.reset(new v8::PropertyDescriptor(
v8::Utils::ToLocal(desc.get()), v8::Utils::ToLocal(desc.set())));
} else if (PropertyDescriptor::IsDataDescriptor(&desc)) {
if (desc.has_writable()) {
descriptor.reset(new v8::PropertyDescriptor(
v8::Utils::ToLocal(desc.value()), desc.writable()));
} else {
descriptor.reset(
new v8::PropertyDescriptor(v8::Utils::ToLocal(desc.value())));
}
}
if (desc.has_enumerable()) {
descriptor->set_enumerable(desc.enumerable());
}
if (desc.has_configurable()) {
descriptor->set_configurable(desc.configurable());
}
if (it->IsElement()) {
uint32_t index = it->index();
v8::IndexedPropertyDefinerCallback definer =
v8::ToCData<v8::IndexedPropertyDefinerCallback>(interceptor->definer());
result = !args.Call(definer, index, *descriptor).is_null();
} else {
Handle<Name> name = it->name();
DCHECK(!name->IsPrivate());
if (name->IsSymbol() && !interceptor->can_intercept_symbols()) {
return Just(false);
}
v8::GenericNamedPropertyDefinerCallback definer =
v8::ToCData<v8::GenericNamedPropertyDefinerCallback>(
interceptor->definer());
result = !args.Call(definer, name, *descriptor).is_null();
}
RETURN_VALUE_IF_SCHEDULED_EXCEPTION(it->isolate(), Nothing<bool>());
return Just(result);
}
} // namespace
MaybeHandle<Object> JSObject::GetPropertyWithFailedAccessCheck(
LookupIterator* it) {
Isolate* isolate = it->isolate();
Handle<JSObject> checked = it->GetHolder<JSObject>();
Handle<InterceptorInfo> interceptor =
it->GetInterceptorForFailedAccessCheck();
if (interceptor.is_null()) {
while (AllCanRead(it)) {
if (it->state() == LookupIterator::ACCESSOR) {
return GetPropertyWithAccessor(it);
}
DCHECK_EQ(LookupIterator::INTERCEPTOR, it->state());
bool done;
Handle<Object> result;
ASSIGN_RETURN_ON_EXCEPTION(isolate, result,
GetPropertyWithInterceptor(it, &done), Object);
if (done) return result;
}
} else {
Handle<Object> result;
bool done;
ASSIGN_RETURN_ON_EXCEPTION(
isolate, result,
GetPropertyWithInterceptorInternal(it, interceptor, &done), Object);
if (done) return result;
}
// Cross-Origin [[Get]] of Well-Known Symbols does not throw, and returns
// undefined.
Handle<Name> name = it->GetName();
if (name->IsSymbol() && Symbol::cast(*name)->is_well_known_symbol()) {
return it->factory()->undefined_value();
}
isolate->ReportFailedAccessCheck(checked);
RETURN_EXCEPTION_IF_SCHEDULED_EXCEPTION(isolate, Object);
return it->factory()->undefined_value();
}
Maybe<PropertyAttributes> JSObject::GetPropertyAttributesWithFailedAccessCheck(
LookupIterator* it) {
Isolate* isolate = it->isolate();
Handle<JSObject> checked = it->GetHolder<JSObject>();
Handle<InterceptorInfo> interceptor =
it->GetInterceptorForFailedAccessCheck();
if (interceptor.is_null()) {
while (AllCanRead(it)) {
if (it->state() == LookupIterator::ACCESSOR) {
return Just(it->property_attributes());
}
DCHECK_EQ(LookupIterator::INTERCEPTOR, it->state());
auto result = GetPropertyAttributesWithInterceptor(it);
if (isolate->has_scheduled_exception()) break;
if (result.IsJust() && result.FromJust() != ABSENT) return result;
}
} else {
Maybe<PropertyAttributes> result =
GetPropertyAttributesWithInterceptorInternal(it, interceptor);
if (isolate->has_pending_exception()) return Nothing<PropertyAttributes>();
if (result.FromMaybe(ABSENT) != ABSENT) return result;
}
isolate->ReportFailedAccessCheck(checked);
RETURN_VALUE_IF_SCHEDULED_EXCEPTION(isolate, Nothing<PropertyAttributes>());
return Just(ABSENT);
}
// static
bool JSObject::AllCanWrite(LookupIterator* it) {
for (; it->IsFound() && it->state() != LookupIterator::JSPROXY; it->Next()) {
if (it->state() == LookupIterator::ACCESSOR) {
Handle<Object> accessors = it->GetAccessors();
if (accessors->IsAccessorInfo()) {
if (AccessorInfo::cast(*accessors)->all_can_write()) return true;
}
}
}
return false;
}
Maybe<bool> JSObject::SetPropertyWithFailedAccessCheck(
LookupIterator* it, Handle<Object> value, ShouldThrow should_throw) {
Isolate* isolate = it->isolate();
Handle<JSObject> checked = it->GetHolder<JSObject>();
Handle<InterceptorInfo> interceptor =
it->GetInterceptorForFailedAccessCheck();
if (interceptor.is_null()) {
if (AllCanWrite(it)) {
return SetPropertyWithAccessor(it, value, should_throw);
}
} else {
Maybe<bool> result = SetPropertyWithInterceptorInternal(
it, interceptor, should_throw, value);
if (isolate->has_pending_exception()) return Nothing<bool>();
if (result.IsJust()) return result;
}
isolate->ReportFailedAccessCheck(checked);
RETURN_VALUE_IF_SCHEDULED_EXCEPTION(isolate, Nothing<bool>());
return Just(true);
}
void JSObject::SetNormalizedProperty(Handle<JSObject> object,
Handle<Name> name,
Handle<Object> value,
PropertyDetails details) {
DCHECK(!object->HasFastProperties());
if (!name->IsUniqueName()) {
name = object->GetIsolate()->factory()->InternalizeString(
Handle<String>::cast(name));
}
if (object->IsJSGlobalObject()) {
Handle<GlobalDictionary> dictionary(object->global_dictionary());
int entry = dictionary->FindEntry(name);
if (entry == GlobalDictionary::kNotFound) {
Isolate* isolate = object->GetIsolate();
auto cell = isolate->factory()->NewPropertyCell();
cell->set_value(*value);
auto cell_type = value->IsUndefined(isolate)
? PropertyCellType::kUndefined
: PropertyCellType::kConstant;
details = details.set_cell_type(cell_type);
value = cell;
dictionary = GlobalDictionary::Add(dictionary, name, value, details);
object->set_properties(*dictionary);
} else {
Handle<PropertyCell> cell =
PropertyCell::PrepareForValue(dictionary, entry, value, details);
cell->set_value(*value);
}
} else {
Handle<NameDictionary> dictionary(object->property_dictionary());
int entry = dictionary->FindEntry(name);
if (entry == NameDictionary::kNotFound) {
dictionary = NameDictionary::Add(dictionary, name, value, details);
object->set_properties(*dictionary);
} else {
PropertyDetails original_details = dictionary->DetailsAt(entry);
int enumeration_index = original_details.dictionary_index();
DCHECK(enumeration_index > 0);
details = details.set_index(enumeration_index);
dictionary->SetEntry(entry, name, value, details);
}
}
}
// static
Maybe<bool> JSReceiver::HasInPrototypeChain(Isolate* isolate,
Handle<JSReceiver> object,
Handle<Object> proto) {
PrototypeIterator iter(isolate, object, kStartAtReceiver);
while (true) {
if (!iter.AdvanceFollowingProxies()) return Nothing<bool>();
if (iter.IsAtEnd()) return Just(false);
if (PrototypeIterator::GetCurrent(iter).is_identical_to(proto)) {
return Just(true);
}
}
}
namespace {
bool HasExcludedProperty(
const ScopedVector<Handle<Object>>* excluded_properties,
Handle<Object> search_element) {
// TODO(gsathya): Change this to be a hashtable.
for (int i = 0; i < excluded_properties->length(); i++) {
if (search_element->SameValue(*excluded_properties->at(i))) {
return true;
}
}
return false;
}
MUST_USE_RESULT Maybe<bool> FastAssign(
Handle<JSReceiver> target, Handle<Object> source,
const ScopedVector<Handle<Object>>* excluded_properties, bool use_set) {
// Non-empty strings are the only non-JSReceivers that need to be handled
// explicitly by Object.assign.
if (!source->IsJSReceiver()) {
return Just(!source->IsString() || String::cast(*source)->length() == 0);
}
// If the target is deprecated, the object will be updated on first store. If
// the source for that store equals the target, this will invalidate the
// cached representation of the source. Preventively upgrade the target.
// Do this on each iteration since any property load could cause deprecation.
if (target->map()->is_deprecated()) {
JSObject::MigrateInstance(Handle<JSObject>::cast(target));
}
Isolate* isolate = target->GetIsolate();
Handle<Map> map(JSReceiver::cast(*source)->map(), isolate);
if (!map->IsJSObjectMap()) return Just(false);
if (!map->OnlyHasSimpleProperties()) return Just(false);
Handle<JSObject> from = Handle<JSObject>::cast(source);
if (from->elements() != isolate->heap()->empty_fixed_array()) {
return Just(false);
}
Handle<DescriptorArray> descriptors(map->instance_descriptors(), isolate);
int length = map->NumberOfOwnDescriptors();
bool stable = true;
for (int i = 0; i < length; i++) {
Handle<Name> next_key(descriptors->GetKey(i), isolate);
Handle<Object> prop_value;
// Directly decode from the descriptor array if |from| did not change shape.
if (stable) {
PropertyDetails details = descriptors->GetDetails(i);
if (!details.IsEnumerable()) continue;
if (details.kind() == kData) {
if (details.location() == kDescriptor) {
prop_value = handle(descriptors->GetValue(i), isolate);
} else {
Representation representation = details.representation();
FieldIndex index = FieldIndex::ForDescriptor(*map, i);
prop_value = JSObject::FastPropertyAt(from, representation, index);
}
} else {
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
isolate, prop_value, JSReceiver::GetProperty(from, next_key),
Nothing<bool>());
stable = from->map() == *map;
}
} else {
// If the map did change, do a slower lookup. We are still guaranteed that
// the object has a simple shape, and that the key is a name.
LookupIterator it(from, next_key, from,
LookupIterator::OWN_SKIP_INTERCEPTOR);
if (!it.IsFound()) continue;
DCHECK(it.state() == LookupIterator::DATA ||
it.state() == LookupIterator::ACCESSOR);
if (!it.IsEnumerable()) continue;
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
isolate, prop_value, Object::GetProperty(&it), Nothing<bool>());
}
if (use_set) {
LookupIterator it(target, next_key, target);
bool call_to_js = it.IsFound() && it.state() != LookupIterator::DATA;
Maybe<bool> result = Object::SetProperty(
&it, prop_value, STRICT, Object::CERTAINLY_NOT_STORE_FROM_KEYED);
if (result.IsNothing()) return result;
if (stable && call_to_js) stable = from->map() == *map;
} else {
if (excluded_properties != nullptr &&
HasExcludedProperty(excluded_properties, next_key)) {
continue;
}
// 4a ii 2. Perform ? CreateDataProperty(target, nextKey, propValue).
bool success;
LookupIterator it = LookupIterator::PropertyOrElement(
isolate, target, next_key, &success, LookupIterator::OWN);
CHECK(success);
CHECK(
JSObject::CreateDataProperty(&it, prop_value, Object::THROW_ON_ERROR)
.FromJust());
}
}
return Just(true);
}
} // namespace
// static
Maybe<bool> JSReceiver::SetOrCopyDataProperties(
Isolate* isolate, Handle<JSReceiver> target, Handle<Object> source,
const ScopedVector<Handle<Object>>* excluded_properties, bool use_set) {
Maybe<bool> fast_assign =
FastAssign(target, source, excluded_properties, use_set);
if (fast_assign.IsNothing()) return Nothing<bool>();
if (fast_assign.FromJust()) return Just(true);
Handle<JSReceiver> from = Object::ToObject(isolate, source).ToHandleChecked();
// 3b. Let keys be ? from.[[OwnPropertyKeys]]().
Handle<FixedArray> keys;
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
isolate, keys,
KeyAccumulator::GetKeys(from, KeyCollectionMode::kOwnOnly, ALL_PROPERTIES,
GetKeysConversion::kKeepNumbers),
Nothing<bool>());
// 4. Repeat for each element nextKey of keys in List order,
for (int j = 0; j < keys->length(); ++j) {
Handle<Object> next_key(keys->get(j), isolate);
// 4a i. Let desc be ? from.[[GetOwnProperty]](nextKey).
PropertyDescriptor desc;
Maybe<bool> found =
JSReceiver::GetOwnPropertyDescriptor(isolate, from, next_key, &desc);
if (found.IsNothing()) return Nothing<bool>();
// 4a ii. If desc is not undefined and desc.[[Enumerable]] is true, then
if (found.FromJust() && desc.enumerable()) {
// 4a ii 1. Let propValue be ? Get(from, nextKey).
Handle<Object> prop_value;
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
isolate, prop_value,
Runtime::GetObjectProperty(isolate, from, next_key), Nothing<bool>());
if (use_set) {
// 4c ii 2. Let status be ? Set(to, nextKey, propValue, true).
Handle<Object> status;
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
isolate, status, Runtime::SetObjectProperty(
isolate, target, next_key, prop_value, STRICT),
Nothing<bool>());
} else {
if (excluded_properties != nullptr &&
HasExcludedProperty(excluded_properties, next_key)) {
continue;
}
// 4a ii 2. Perform ! CreateDataProperty(target, nextKey, propValue).
bool success;
LookupIterator it = LookupIterator::PropertyOrElement(
isolate, target, next_key, &success, LookupIterator::OWN);
CHECK(success);
CHECK(JSObject::CreateDataProperty(&it, prop_value,
Object::THROW_ON_ERROR)
.FromJust());
}
}
}
return Just(true);
}
Map* Object::GetPrototypeChainRootMap(Isolate* isolate) {
DisallowHeapAllocation no_alloc;
if (IsSmi()) {
Context* native_context = isolate->context()->native_context();
return native_context->number_function()->initial_map();
}
// The object is either a number, a string, a symbol, a boolean, a real JS
// object, or a Harmony proxy.
HeapObject* heap_object = HeapObject::cast(this);
return heap_object->map()->GetPrototypeChainRootMap(isolate);
}
Map* Map::GetPrototypeChainRootMap(Isolate* isolate) {
DisallowHeapAllocation no_alloc;
if (IsJSReceiverMap()) {
return this;
}
int constructor_function_index = GetConstructorFunctionIndex();
if (constructor_function_index != Map::kNoConstructorFunctionIndex) {
Context* native_context = isolate->context()->native_context();
JSFunction* constructor_function =
JSFunction::cast(native_context->get(constructor_function_index));
return constructor_function->initial_map();
}
return isolate->heap()->null_value()->map();
}
namespace {
// Returns a non-SMI for JSObjects, but returns the hash code for simple
// objects. This avoids a double lookup in the cases where we know we will
// add the hash to the JSObject if it does not already exist.
Object* GetSimpleHash(Object* object) {
// The object is either a Smi, a HeapNumber, a name, an odd-ball, a real JS
// object, or a Harmony proxy.
if (object->IsSmi()) {
uint32_t hash =
ComputeIntegerHash(Smi::cast(object)->value(), kZeroHashSeed);
return Smi::FromInt(hash & Smi::kMaxValue);
}
if (object->IsHeapNumber()) {
double num = HeapNumber::cast(object)->value();
if (std::isnan(num)) return Smi::FromInt(Smi::kMaxValue);
if (i::IsMinusZero(num)) num = 0;
if (IsSmiDouble(num)) {
return Smi::FromInt(FastD2I(num))->GetHash();
}
uint32_t hash = ComputeLongHash(double_to_uint64(num));
return Smi::FromInt(hash & Smi::kMaxValue);
}
if (object->IsName()) {
uint32_t hash = Name::cast(object)->Hash();
return Smi::FromInt(hash);
}
if (object->IsOddball()) {
uint32_t hash = Oddball::cast(object)->to_string()->Hash();
return Smi::FromInt(hash);
}
DCHECK(object->IsJSReceiver());
// Simply return the receiver as it is guaranteed to not be a SMI.
return object;
}
} // namespace
Object* Object::GetHash() {
Object* hash = GetSimpleHash(this);
if (hash->IsSmi()) return hash;
DisallowHeapAllocation no_gc;
DCHECK(IsJSReceiver());
JSReceiver* receiver = JSReceiver::cast(this);
Isolate* isolate = receiver->GetIsolate();
return JSReceiver::GetIdentityHash(isolate, handle(receiver, isolate));
}
Smi* Object::GetOrCreateHash(Isolate* isolate, Handle<Object> object) {
Object* hash = GetSimpleHash(*object);
if (hash->IsSmi()) return Smi::cast(hash);
DCHECK(object->IsJSReceiver());
return JSReceiver::GetOrCreateIdentityHash(isolate,
Handle<JSReceiver>::cast(object));
}
bool Object::SameValue(Object* other) {
if (other == this) return true;
// The object is either a number, a name, an odd-ball,
// a real JS object, or a Harmony proxy.
if (IsNumber() && other->IsNumber()) {
double this_value = Number();
double other_value = other->Number();
// SameValue(NaN, NaN) is true.
if (this_value != other_value) {
return std::isnan(this_value) && std::isnan(other_value);
}
// SameValue(0.0, -0.0) is false.
return (std::signbit(this_value) == std::signbit(other_value));
}
if (IsString() && other->IsString()) {
return String::cast(this)->Equals(String::cast(other));
}
return false;
}
bool Object::SameValueZero(Object* other) {
if (other == this) return true;
// The object is either a number, a name, an odd-ball,
// a real JS object, or a Harmony proxy.
if (IsNumber() && other->IsNumber()) {
double this_value = Number();
double other_value = other->Number();
// +0 == -0 is true
return this_value == other_value ||
(std::isnan(this_value) && std::isnan(other_value));
}
if (IsString() && other->IsString()) {
return String::cast(this)->Equals(String::cast(other));
}
return false;
}
MaybeHandle<Object> Object::ArraySpeciesConstructor(
Isolate* isolate, Handle<Object> original_array) {
Handle<Object> default_species = isolate->array_function();
if (original_array->IsJSArray() &&
Handle<JSArray>::cast(original_array)->HasArrayPrototype(isolate) &&
isolate->IsArraySpeciesLookupChainIntact()) {
return default_species;
}
Handle<Object> constructor = isolate->factory()->undefined_value();
Maybe<bool> is_array = Object::IsArray(original_array);
MAYBE_RETURN_NULL(is_array);
if (is_array.FromJust()) {
ASSIGN_RETURN_ON_EXCEPTION(
isolate, constructor,
Object::GetProperty(original_array,
isolate->factory()->constructor_string()),
Object);
if (constructor->IsConstructor()) {
Handle<Context> constructor_context;
ASSIGN_RETURN_ON_EXCEPTION(
isolate, constructor_context,
JSReceiver::GetFunctionRealm(Handle<JSReceiver>::cast(constructor)),
Object);
if (*constructor_context != *isolate->native_context() &&
*constructor == constructor_context->array_function()) {
constructor = isolate->factory()->undefined_value();
}
}
if (constructor->IsJSReceiver()) {
ASSIGN_RETURN_ON_EXCEPTION(
isolate, constructor,
JSReceiver::GetProperty(Handle<JSReceiver>::cast(constructor),
isolate->factory()->species_symbol()),
Object);
if (constructor->IsNull(isolate)) {
constructor = isolate->factory()->undefined_value();
}
}
}
if (constructor->IsUndefined(isolate)) {
return default_species;
} else {
if (!constructor->IsConstructor()) {
THROW_NEW_ERROR(isolate,
NewTypeError(MessageTemplate::kSpeciesNotConstructor),
Object);
}
return constructor;
}
}
bool Object::IterationHasObservableEffects() {
// Check that this object is an array.
if (!IsJSArray()) return true;
JSArray* spread_array = JSArray::cast(this);
Isolate* isolate = spread_array->GetIsolate();
// Check that we have the original ArrayPrototype.
JSObject* array_proto = JSObject::cast(spread_array->map()->prototype());
if (!isolate->is_initial_array_prototype(array_proto)) return true;
// Check that the ArrayPrototype hasn't been modified in a way that would
// affect iteration.
if (!isolate->IsArrayIteratorLookupChainIntact()) return true;
// Check that the map of the initial array iterator hasn't changed.
Map* iterator_map = isolate->initial_array_iterator_prototype()->map();
if (!isolate->is_initial_array_iterator_prototype_map(iterator_map)) {
return true;
}
// For FastPacked kinds, iteration will have the same effect as simply
// accessing each property in order.
ElementsKind array_kind = spread_array->GetElementsKind();
if (IsFastPackedElementsKind(array_kind)) return false;
// For FastHoley kinds, an element access on a hole would cause a lookup on
// the prototype. This could have different results if the prototype has been
// changed.
if (IsFastHoleyElementsKind(array_kind) &&
isolate->IsFastArrayConstructorPrototypeChainIntact()) {
return false;
}
return true;
}
void Object::ShortPrint(FILE* out) {
OFStream os(out);
os << Brief(this);
}
void Object::ShortPrint(StringStream* accumulator) {
std::ostringstream os;
os << Brief(this);
accumulator->Add(os.str().c_str());
}
void Object::ShortPrint(std::ostream& os) { os << Brief(this); }
std::ostream& operator<<(std::ostream& os, const Brief& v) {
if (v.value->IsSmi()) {
Smi::cast(v.value)->SmiPrint(os);
} else {
// TODO(svenpanne) Const-correct HeapObjectShortPrint!
HeapObject* obj = const_cast<HeapObject*>(HeapObject::cast(v.value));
obj->HeapObjectShortPrint(os);
}
return os;
}
void Smi::SmiPrint(std::ostream& os) const { // NOLINT
os << value();
}
// Should a word be prefixed by 'a' or 'an' in order to read naturally in
// English? Returns false for non-ASCII or words that don't start with
// a capital letter. The a/an rule follows pronunciation in English.
// We don't use the BBC's overcorrect "an historic occasion" though if
// you speak a dialect you may well say "an 'istoric occasion".
static bool AnWord(String* str) {
if (str->length() == 0) return false; // A nothing.
int c0 = str->Get(0);
int c1 = str->length() > 1 ? str->Get(1) : 0;
if (c0 == 'U') {
if (c1 > 'Z') {
return true; // An Umpire, but a UTF8String, a U.
}
} else if (c0 == 'A' || c0 == 'E' || c0 == 'I' || c0 == 'O') {
return true; // An Ape, an ABCBook.
} else if ((c1 == 0 || (c1 >= 'A' && c1 <= 'Z')) &&
(c0 == 'F' || c0 == 'H' || c0 == 'M' || c0 == 'N' || c0 == 'R' ||
c0 == 'S' || c0 == 'X')) {
return true; // An MP3File, an M.
}
return false;
}
Handle<String> String::SlowFlatten(Handle<ConsString> cons,
PretenureFlag pretenure) {
DCHECK(cons->second()->length() != 0);
// TurboFan can create cons strings with empty first parts.
while (cons->first()->length() == 0) {
// We do not want to call this function recursively. Therefore we call
// String::Flatten only in those cases where String::SlowFlatten is not
// called again.
if (cons->second()->IsConsString() && !cons->second()->IsFlat()) {
cons = handle(ConsString::cast(cons->second()));
} else {
return String::Flatten(handle(cons->second()));
}
}
DCHECK(AllowHeapAllocation::IsAllowed());
Isolate* isolate = cons->GetIsolate();
int length = cons->length();
PretenureFlag tenure = isolate->heap()->InNewSpace(*cons) ? pretenure
: TENURED;
Handle<SeqString> result;
if (cons->IsOneByteRepresentation()) {
Handle<SeqOneByteString> flat = isolate->factory()->NewRawOneByteString(
length, tenure).ToHandleChecked();
DisallowHeapAllocation no_gc;
WriteToFlat(*cons, flat->GetChars(), 0, length);
result = flat;
} else {
Handle<SeqTwoByteString> flat = isolate->factory()->NewRawTwoByteString(
length, tenure).ToHandleChecked();
DisallowHeapAllocation no_gc;
WriteToFlat(*cons, flat->GetChars(), 0, length);
result = flat;
}
cons->set_first(*result);
cons->set_second(isolate->heap()->empty_string());
DCHECK(result->IsFlat());
return result;
}
bool String::MakeExternal(v8::String::ExternalStringResource* resource) {
// Externalizing twice leaks the external resource, so it's
// prohibited by the API.
DCHECK(!this->IsExternalString());
DCHECK(!resource->IsCompressible());
#ifdef ENABLE_SLOW_DCHECKS
if (FLAG_enable_slow_asserts) {
// Assert that the resource and the string are equivalent.
DCHECK(static_cast<size_t>(this->length()) == resource->length());
ScopedVector<uc16> smart_chars(this->length());
String::WriteToFlat(this, smart_chars.start(), 0, this->length());
DCHECK(memcmp(smart_chars.start(),
resource->data(),
resource->length() * sizeof(smart_chars[0])) == 0);
}
#endif // DEBUG
int size = this->Size(); // Byte size of the original string.
// Abort if size does not allow in-place conversion.
if (size < ExternalString::kShortSize) return false;
Heap* heap = GetHeap();
bool is_one_byte = this->IsOneByteRepresentation();
bool is_internalized = this->IsInternalizedString();
bool has_pointers = StringShape(this).IsIndirect();
// Morph the string to an external string by replacing the map and
// reinitializing the fields. This won't work if the space the existing
// string occupies is too small for a regular external string.
// Instead, we resort to a short external string instead, omitting
// the field caching the address of the backing store. When we encounter
// short external strings in generated code, we need to bailout to runtime.
Map* new_map;
if (size < ExternalString::kSize) {
new_map = is_internalized
? (is_one_byte
? heap->short_external_internalized_string_with_one_byte_data_map()
: heap->short_external_internalized_string_map())
: (is_one_byte ? heap->short_external_string_with_one_byte_data_map()
: heap->short_external_string_map());
} else {
new_map = is_internalized
? (is_one_byte
? heap->external_internalized_string_with_one_byte_data_map()
: heap->external_internalized_string_map())
: (is_one_byte ? heap->external_string_with_one_byte_data_map()
: heap->external_string_map());
}
// Byte size of the external String object.
int new_size = this->SizeFromMap(new_map);
heap->CreateFillerObjectAt(this->address() + new_size, size - new_size,
ClearRecordedSlots::kNo);
if (has_pointers) {
heap->ClearRecordedSlotRange(this->address(), this->address() + new_size);
}
// We are storing the new map using release store after creating a filler for
// the left-over space to avoid races with the sweeper thread.
this->synchronized_set_map(new_map);
ExternalTwoByteString* self = ExternalTwoByteString::cast(this);
self->set_resource(resource);
if (is_internalized) self->Hash(); // Force regeneration of the hash value.
heap->AdjustLiveBytes(this, new_size - size);
return true;
}
bool String::MakeExternal(v8::String::ExternalOneByteStringResource* resource) {
// Externalizing twice leaks the external resource, so it's
// prohibited by the API.
DCHECK(!this->IsExternalString());
DCHECK(!resource->IsCompressible());
#ifdef ENABLE_SLOW_DCHECKS
if (FLAG_enable_slow_asserts) {
// Assert that the resource and the string are equivalent.
DCHECK(static_cast<size_t>(this->length()) == resource->length());
if (this->IsTwoByteRepresentation()) {
ScopedVector<uint16_t> smart_chars(this->length());
String::WriteToFlat(this, smart_chars.start(), 0, this->length());
DCHECK(String::IsOneByte(smart_chars.start(), this->length()));
}
ScopedVector<char> smart_chars(this->length());
String::WriteToFlat(this, smart_chars.start(), 0, this->length());
DCHECK(memcmp(smart_chars.start(),
resource->data(),
resource->length() * sizeof(smart_chars[0])) == 0);
}
#endif // DEBUG
int size = this->Size(); // Byte size of the original string.
// Abort if size does not allow in-place conversion.
if (size < ExternalString::kShortSize) return false;
Heap* heap = GetHeap();
bool is_internalized = this->IsInternalizedString();
bool has_pointers = StringShape(this).IsIndirect();
// Morph the string to an external string by replacing the map and
// reinitializing the fields. This won't work if the space the existing
// string occupies is too small for a regular external string.
// Instead, we resort to a short external string instead, omitting
// the field caching the address of the backing store. When we encounter
// short external strings in generated code, we need to bailout to runtime.
Map* new_map;
if (size < ExternalString::kSize) {
new_map = is_internalized
? heap->short_external_one_byte_internalized_string_map()
: heap->short_external_one_byte_string_map();
} else {
new_map = is_internalized
? heap->external_one_byte_internalized_string_map()
: heap->external_one_byte_string_map();
}
// Byte size of the external String object.
int new_size = this->SizeFromMap(new_map);
heap->CreateFillerObjectAt(this->address() + new_size, size - new_size,
ClearRecordedSlots::kNo);
if (has_pointers) {
heap->ClearRecordedSlotRange(this->address(), this->address() + new_size);
}
// We are storing the new map using release store after creating a filler for
// the left-over space to avoid races with the sweeper thread.
this->synchronized_set_map(new_map);
ExternalOneByteString* self = ExternalOneByteString::cast(this);
self->set_resource(resource);
if (is_internalized) self->Hash(); // Force regeneration of the hash value.
heap->AdjustLiveBytes(this, new_size - size);
return true;
}
void String::StringShortPrint(StringStream* accumulator, bool show_details) {
int len = length();
if (len > kMaxShortPrintLength) {
accumulator->Add("<Very long string[%u]>", len);
return;
}
if (!LooksValid()) {
accumulator->Add("<Invalid String>");
return;
}
StringCharacterStream stream(this);
bool truncated = false;
if (len > kMaxShortPrintLength) {
len = kMaxShortPrintLength;
truncated = true;
}
bool one_byte = true;
for (int i = 0; i < len; i++) {
uint16_t c = stream.GetNext();
if (c < 32 || c >= 127) {
one_byte = false;
}
}
stream.Reset(this);
if (one_byte) {
if (show_details) accumulator->Add("<String[%u]: ", length());
for (int i = 0; i < len; i++) {
accumulator->Put(static_cast<char>(stream.GetNext()));
}
if (show_details) accumulator->Put('>');
} else {
// Backslash indicates that the string contains control
// characters and that backslashes are therefore escaped.
if (show_details) accumulator->Add("<String[%u]\\: ", length());
for (int i = 0; i < len; i++) {
uint16_t c = stream.GetNext();
if (c == '\n') {
accumulator->Add("\\n");
} else if (c == '\r') {
accumulator->Add("\\r");
} else if (c == '\\') {
accumulator->Add("\\\\");
} else if (c < 32 || c > 126) {
accumulator->Add("\\x%02x", c);
} else {
accumulator->Put(static_cast<char>(c));
}
}
if (truncated) {
accumulator->Put('.');
accumulator->Put('.');
accumulator->Put('.');
}
if (show_details) accumulator->Put('>');
}
return;
}
void String::PrintUC16(std::ostream& os, int start, int end) { // NOLINT
if (end < 0) end = length();
StringCharacterStream stream(this, start);
for (int i = start; i < end && stream.HasMore(); i++) {
os << AsUC16(stream.GetNext());
}
}
void JSObject::JSObjectShortPrint(StringStream* accumulator) {
switch (map()->instance_type()) {
case JS_ARRAY_TYPE: {
double length = JSArray::cast(this)->length()->IsUndefined(GetIsolate())
? 0
: JSArray::cast(this)->length()->Number();
accumulator->Add("<JS Array[%u]>", static_cast<uint32_t>(length));
break;
}
case JS_BOUND_FUNCTION_TYPE: {
JSBoundFunction* bound_function = JSBoundFunction::cast(this);
accumulator->Add("<JS BoundFunction");
accumulator->Add(
" (BoundTargetFunction %p)>",
reinterpret_cast<void*>(bound_function->bound_target_function()));
break;
}
case JS_WEAK_MAP_TYPE: {
accumulator->Add("<JS WeakMap>");
break;
}
case JS_WEAK_SET_TYPE: {
accumulator->Add("<JS WeakSet>");
break;
}
case JS_REGEXP_TYPE: {
accumulator->Add("<JS RegExp>");
break;
}
case JS_FUNCTION_TYPE: {
JSFunction* function = JSFunction::cast(this);
Object* fun_name = function->shared()->DebugName();
bool printed = false;
if (fun_name->IsString()) {
String* str = String::cast(fun_name);
if (str->length() > 0) {
accumulator->Add("<JS Function ");
accumulator->Put(str);
printed = true;
}
}
if (!printed) {
accumulator->Add("<JS Function");
}
if (FLAG_trace_file_names) {
Object* source_name =
Script::cast(function->shared()->script())->name();
if (source_name->IsString()) {
String* str = String::cast(source_name);
if (str->length() > 0) {
accumulator->Add(" <");
accumulator->Put(str);
accumulator->Add(">");
}
}
}
accumulator->Add(" (SharedFunctionInfo %p)",
reinterpret_cast<void*>(function->shared()));
accumulator->Put('>');
break;
}
case JS_GENERATOR_OBJECT_TYPE: {
accumulator->Add("<JS Generator>");
break;
}
// All other JSObjects are rather similar to each other (JSObject,
// JSGlobalProxy, JSGlobalObject, JSUndetectable, JSValue).
default: {
Map* map_of_this = map();
Heap* heap = GetHeap();
Object* constructor = map_of_this->GetConstructor();
bool printed = false;
if (constructor->IsHeapObject() &&
!heap->Contains(HeapObject::cast(constructor))) {
accumulator->Add("!!!INVALID CONSTRUCTOR!!!");
} else {
bool global_object = IsJSGlobalProxy();
if (constructor->IsJSFunction()) {
if (!heap->Contains(JSFunction::cast(constructor)->shared())) {
accumulator->Add("!!!INVALID SHARED ON CONSTRUCTOR!!!");
} else {
Object* constructor_name =
JSFunction::cast(constructor)->shared()->name();
if (constructor_name->IsString()) {
String* str = String::cast(constructor_name);
if (str->length() > 0) {
bool vowel = AnWord(str);
accumulator->Add("<%sa%s ",
global_object ? "Global Object: " : "",
vowel ? "n" : "");
accumulator->Put(str);
accumulator->Add(" with %smap %p",
map_of_this->is_deprecated() ? "deprecated " : "",
map_of_this);
printed = true;
}
}
}
}
if (!printed) {
accumulator->Add("<JS %sObject", global_object ? "Global " : "");
}
}
if (IsJSValue()) {
accumulator->Add(" value = ");
JSValue::cast(this)->value()->ShortPrint(accumulator);
}
accumulator->Put('>');
break;
}
}
}
void JSObject::PrintElementsTransition(
FILE* file, Handle<JSObject> object,
ElementsKind from_kind, Handle<FixedArrayBase> from_elements,
ElementsKind to_kind, Handle<FixedArrayBase> to_elements) {
if (from_kind != to_kind) {
OFStream os(file);
os << "elements transition [" << ElementsKindToString(from_kind) << " -> "
<< ElementsKindToString(to_kind) << "] in ";
JavaScriptFrame::PrintTop(object->GetIsolate(), file, false, true);
PrintF(file, " for ");
object->ShortPrint(file);
PrintF(file, " from ");
from_elements->ShortPrint(file);
PrintF(file, " to ");
to_elements->ShortPrint(file);
PrintF(file, "\n");
}
}
// static
MaybeHandle<JSFunction> Map::GetConstructorFunction(
Handle<Map> map, Handle<Context> native_context) {
if (map->IsPrimitiveMap()) {
int const constructor_function_index = map->GetConstructorFunctionIndex();
if (constructor_function_index != kNoConstructorFunctionIndex) {
return handle(
JSFunction::cast(native_context->get(constructor_function_index)));
}
}
return MaybeHandle<JSFunction>();
}
void Map::PrintReconfiguration(FILE* file, int modify_index, PropertyKind kind,
PropertyAttributes attributes) {
OFStream os(file);
os << "[reconfiguring]";
Name* name = instance_descriptors()->GetKey(modify_index);
if (name->IsString()) {
String::cast(name)->PrintOn(file);
} else {
os << "{symbol " << static_cast<void*>(name) << "}";
}
os << ": " << (kind == kData ? "kData" : "ACCESSORS") << ", attrs: ";
os << attributes << " [";
JavaScriptFrame::PrintTop(GetIsolate(), file, false, true);
os << "]\n";
}
void Map::PrintGeneralization(
FILE* file, const char* reason, int modify_index, int split,
int descriptors, bool descriptor_to_field,
Representation old_representation, Representation new_representation,
MaybeHandle<FieldType> old_field_type, MaybeHandle<Object> old_value,
MaybeHandle<FieldType> new_field_type, MaybeHandle<Object> new_value) {
OFStream os(file);
os << "[generalizing]";
Name* name = instance_descriptors()->GetKey(modify_index);
if (name->IsString()) {
String::cast(name)->PrintOn(file);
} else {
os << "{symbol " << static_cast<void*>(name) << "}";
}
os << ":";
if (descriptor_to_field) {
os << "c";
} else {
os << old_representation.Mnemonic() << "{";
if (old_field_type.is_null()) {
os << Brief(*(old_value.ToHandleChecked()));
} else {
old_field_type.ToHandleChecked()->PrintTo(os);
}
os << "}";
}
os << "->" << new_representation.Mnemonic() << "{";
if (new_field_type.is_null()) {
os << Brief(*(new_value.ToHandleChecked()));
} else {
new_field_type.ToHandleChecked()->PrintTo(os);
}
os << "} (";
if (strlen(reason) > 0) {
os << reason;
} else {
os << "+" << (descriptors - split) << " maps";
}
os << ") [";
JavaScriptFrame::PrintTop(GetIsolate(), file, false, true);
os << "]\n";
}
void JSObject::PrintInstanceMigration(FILE* file,
Map* original_map,
Map* new_map) {
PrintF(file, "[migrating]");
DescriptorArray* o = original_map->instance_descriptors();
DescriptorArray* n = new_map->instance_descriptors();
for (int i = 0; i < original_map->NumberOfOwnDescriptors(); i++) {
Representation o_r = o->GetDetails(i).representation();
Representation n_r = n->GetDetails(i).representation();
if (!o_r.Equals(n_r)) {
String::cast(o->GetKey(i))->PrintOn(file);
PrintF(file, ":%s->%s ", o_r.Mnemonic(), n_r.Mnemonic());
} else if (o->GetDetails(i).location() == kDescriptor &&
n->GetDetails(i).location() == kField) {
Name* name = o->GetKey(i);
if (name->IsString()) {
String::cast(name)->PrintOn(file);
} else {
PrintF(file, "{symbol %p}", static_cast<void*>(name));
}
PrintF(file, " ");
}
}
PrintF(file, "\n");
}
void HeapObject::HeapObjectShortPrint(std::ostream& os) { // NOLINT
Heap* heap = GetHeap();
Isolate* isolate = heap->isolate();
if (!heap->Contains(this)) {
os << "!!!INVALID POINTER!!!";
return;
}
if (!heap->Contains(map())) {
os << "!!!INVALID MAP!!!";
return;
}
os << this << " ";
if (IsString()) {
HeapStringAllocator allocator;
StringStream accumulator(&allocator);
String::cast(this)->StringShortPrint(&accumulator);
os << accumulator.ToCString().get();
return;
}
if (IsJSObject()) {
HeapStringAllocator allocator;
StringStream accumulator(&allocator);
JSObject::cast(this)->JSObjectShortPrint(&accumulator);
os << accumulator.ToCString().get();
return;
}
switch (map()->instance_type()) {
case MAP_TYPE:
os << "<Map(" << ElementsKindToString(Map::cast(this)->elements_kind())
<< ")>";
break;
case FIXED_ARRAY_TYPE:
os << "<FixedArray[" << FixedArray::cast(this)->length() << "]>";
break;
case FIXED_DOUBLE_ARRAY_TYPE:
os << "<FixedDoubleArray[" << FixedDoubleArray::cast(this)->length()
<< "]>";
break;
case BYTE_ARRAY_TYPE:
os << "<ByteArray[" << ByteArray::cast(this)->length() << "]>";
break;
case BYTECODE_ARRAY_TYPE:
os << "<BytecodeArray[" << BytecodeArray::cast(this)->length() << "]>";
break;
case TRANSITION_ARRAY_TYPE:
os << "<TransitionArray[" << TransitionArray::cast(this)->length()
<< "]>";
break;
case FREE_SPACE_TYPE:
os << "<FreeSpace[" << FreeSpace::cast(this)->size() << "]>";
break;
#define TYPED_ARRAY_SHORT_PRINT(Type, type, TYPE, ctype, size) \
case FIXED_##TYPE##_ARRAY_TYPE: \
os << "<Fixed" #Type "Array[" << Fixed##Type##Array::cast(this)->length() \
<< "]>"; \
break;
TYPED_ARRAYS(TYPED_ARRAY_SHORT_PRINT)
#undef TYPED_ARRAY_SHORT_PRINT
case SHARED_FUNCTION_INFO_TYPE: {
SharedFunctionInfo* shared = SharedFunctionInfo::cast(this);
std::unique_ptr<char[]> debug_name = shared->DebugName()->ToCString();
if (debug_name[0] != 0) {
os << "<SharedFunctionInfo " << debug_name.get() << ">";
} else {
os << "<SharedFunctionInfo>";
}
break;
}
case JS_MESSAGE_OBJECT_TYPE:
os << "<JSMessageObject>";
break;
#define MAKE_STRUCT_CASE(NAME, Name, name) \
case NAME##_TYPE: \
os << "<" #Name ">"; \
break;
STRUCT_LIST(MAKE_STRUCT_CASE)
#undef MAKE_STRUCT_CASE
case CODE_TYPE: {
Code* code = Code::cast(this);
os << "<Code: " << Code::Kind2String(code->kind()) << ">";
break;
}
case ODDBALL_TYPE: {
if (IsUndefined(isolate)) {
os << "<undefined>";
} else if (IsTheHole(isolate)) {
os << "<the hole>";
} else if (IsNull(isolate)) {
os << "<null>";
} else if (IsTrue(isolate)) {
os << "<true>";
} else if (IsFalse(isolate)) {
os << "<false>";
} else {
os << "<Odd Oddball: ";
os << Oddball::cast(this)->to_string()->ToCString().get();
os << ">";
}
break;
}
case SYMBOL_TYPE: {
Symbol* symbol = Symbol::cast(this);
symbol->SymbolShortPrint(os);
break;
}
case HEAP_NUMBER_TYPE: {
os << "<Number: ";
HeapNumber::cast(this)->HeapNumberPrint(os);
os << ">";
break;
}
case MUTABLE_HEAP_NUMBER_TYPE: {
os << "<MutableNumber: ";
HeapNumber::cast(this)->HeapNumberPrint(os);
os << '>';
break;
}
case JS_PROXY_TYPE:
os << "<JSProxy>";
break;
case FOREIGN_TYPE:
os << "<Foreign>";
break;
case CELL_TYPE: {
os << "Cell for ";
HeapStringAllocator allocator;
StringStream accumulator(&allocator);
Cell::cast(this)->value()->ShortPrint(&accumulator);
os << accumulator.ToCString().get();
break;
}
case PROPERTY_CELL_TYPE: {
os << "PropertyCell for ";
HeapStringAllocator allocator;
StringStream accumulator(&allocator);
PropertyCell* cell = PropertyCell::cast(this);
cell->value()->ShortPrint(&accumulator);
os << accumulator.ToCString().get();
break;
}
case WEAK_CELL_TYPE: {
os << "WeakCell for ";
HeapStringAllocator allocator;
StringStream accumulator(&allocator);
WeakCell::cast(this)->value()->ShortPrint(&accumulator);
os << accumulator.ToCString().get();
break;
}
default:
os << "<Other heap object (" << map()->instance_type() << ")>";
break;
}
}
void HeapObject::Iterate(ObjectVisitor* v) { IterateFast<ObjectVisitor>(v); }
void HeapObject::IterateBody(ObjectVisitor* v) {
Map* m = map();
IterateBodyFast<ObjectVisitor>(m->instance_type(), SizeFromMap(m), v);
}
void HeapObject::IterateBody(InstanceType type, int object_size,
ObjectVisitor* v) {
IterateBodyFast<ObjectVisitor>(type, object_size, v);
}
struct CallIsValidSlot {
template <typename BodyDescriptor>
static bool apply(HeapObject* obj, int offset, int) {
return BodyDescriptor::IsValidSlot(obj, offset);
}
};
bool HeapObject::IsValidSlot(int offset) {
DCHECK_NE(0, offset);
return BodyDescriptorApply<CallIsValidSlot, bool>(map()->instance_type(),
this, offset, 0);
}
bool HeapNumber::HeapNumberBooleanValue() {
return DoubleToBoolean(value());
}
void HeapNumber::HeapNumberPrint(std::ostream& os) { // NOLINT
os << value();
}
#define FIELD_ADDR_CONST(p, offset) \
(reinterpret_cast<const byte*>(p) + offset - kHeapObjectTag)
#define READ_INT32_FIELD(p, offset) \
(*reinterpret_cast<const int32_t*>(FIELD_ADDR_CONST(p, offset)))
#define READ_INT64_FIELD(p, offset) \
(*reinterpret_cast<const int64_t*>(FIELD_ADDR_CONST(p, offset)))
#define READ_BYTE_FIELD(p, offset) \
(*reinterpret_cast<const byte*>(FIELD_ADDR_CONST(p, offset)))
String* JSReceiver::class_name() {
if (IsFunction()) {
return GetHeap()->Function_string();
}
Object* maybe_constructor = map()->GetConstructor();
if (maybe_constructor->IsJSFunction()) {
JSFunction* constructor = JSFunction::cast(maybe_constructor);
return String::cast(constructor->shared()->instance_class_name());
}
// If the constructor is not present, return "Object".
return GetHeap()->Object_string();
}
// static
Handle<String> JSReceiver::GetConstructorName(Handle<JSReceiver> receiver) {
Isolate* isolate = receiver->GetIsolate();
// If the object was instantiated simply with base == new.target, the
// constructor on the map provides the most accurate name.
// Don't provide the info for prototypes, since their constructors are
// reclaimed and replaced by Object in OptimizeAsPrototype.
if (!receiver->IsJSProxy() && receiver->map()->new_target_is_base() &&
!receiver->map()->is_prototype_map()) {
Object* maybe_constructor = receiver->map()->GetConstructor();
if (maybe_constructor->IsJSFunction()) {
JSFunction* constructor = JSFunction::cast(maybe_constructor);
String* name = String::cast(constructor->shared()->name());
if (name->length() == 0) name = constructor->shared()->inferred_name();
if (name->length() != 0 &&
!name->Equals(isolate->heap()->Object_string())) {
return handle(name, isolate);
}
}
}
Handle<Object> maybe_tag = JSReceiver::GetDataProperty(
receiver, isolate->factory()->to_string_tag_symbol());
if (maybe_tag->IsString()) return Handle<String>::cast(maybe_tag);
PrototypeIterator iter(isolate, receiver);
if (iter.IsAtEnd()) return handle(receiver->class_name());
Handle<JSReceiver> start = PrototypeIterator::GetCurrent<JSReceiver>(iter);
LookupIterator it(receiver, isolate->factory()->constructor_string(), start,
LookupIterator::PROTOTYPE_CHAIN_SKIP_INTERCEPTOR);
Handle<Object> maybe_constructor = JSReceiver::GetDataProperty(&it);
Handle<String> result = isolate->factory()->Object_string();
if (maybe_constructor->IsJSFunction()) {
JSFunction* constructor = JSFunction::cast(*maybe_constructor);
String* name = String::cast(constructor->shared()->name());
if (name->length() == 0) name = constructor->shared()->inferred_name();
if (name->length() > 0) result = handle(name, isolate);
}
return result.is_identical_to(isolate->factory()->Object_string())
? handle(receiver->class_name())
: result;
}
Handle<Context> JSReceiver::GetCreationContext() {
JSReceiver* receiver = this;
while (receiver->IsJSBoundFunction()) {
receiver = JSBoundFunction::cast(receiver)->bound_target_function();
}
Object* constructor = receiver->map()->GetConstructor();
JSFunction* function;
if (constructor->IsJSFunction()) {
function = JSFunction::cast(constructor);
} else {
// Functions have null as a constructor,
// but any JSFunction knows its context immediately.
CHECK(receiver->IsJSFunction());
function = JSFunction::cast(receiver);
}
return function->has_context()
? Handle<Context>(function->context()->native_context())
: Handle<Context>::null();
}
Handle<Object> Map::WrapFieldType(Handle<FieldType> type) {
if (type->IsClass()) return Map::WeakCellForMap(type->AsClass());
return type;
}
FieldType* Map::UnwrapFieldType(Object* wrapped_type) {
Object* value = wrapped_type;
if (value->IsWeakCell()) {
if (WeakCell::cast(value)->cleared()) return FieldType::None();
value = WeakCell::cast(value)->value();
}
return FieldType::cast(value);
}
MaybeHandle<Map> Map::CopyWithField(Handle<Map> map, Handle<Name> name,
Handle<FieldType> type,
PropertyAttributes attributes,
PropertyConstness constness,
Representation representation,
TransitionFlag flag) {
DCHECK(DescriptorArray::kNotFound ==
map->instance_descriptors()->Search(
*name, map->NumberOfOwnDescriptors()));
// Ensure the descriptor array does not get too big.
if (map->NumberOfOwnDescriptors() >= kMaxNumberOfDescriptors) {
return MaybeHandle<Map>();
}
Isolate* isolate = map->GetIsolate();
// Compute the new index for new field.
int index = map->NextFreePropertyIndex();
if (map->instance_type() == JS_CONTEXT_EXTENSION_OBJECT_TYPE) {
representation = Representation::Tagged();
type = FieldType::Any(isolate);
}
Handle<Object> wrapped_type(WrapFieldType(type));
DCHECK_IMPLIES(!FLAG_track_constant_fields, constness == kMutable);
Descriptor d = Descriptor::DataField(name, index, attributes, constness,
representation, wrapped_type);
Handle<Map> new_map = Map::CopyAddDescriptor(map, &d, flag);
int unused_property_fields = new_map->unused_property_fields() - 1;
if (unused_property_fields < 0) {
unused_property_fields += JSObject::kFieldsAdded;
}
new_map->set_unused_property_fields(unused_property_fields);
return new_map;
}
MaybeHandle<Map> Map::CopyWithConstant(Handle<Map> map,
Handle<Name> name,
Handle<Object> constant,
PropertyAttributes attributes,
TransitionFlag flag) {
// Ensure the descriptor array does not get too big.
if (map->NumberOfOwnDescriptors() >= kMaxNumberOfDescriptors) {
return MaybeHandle<Map>();
}
if (FLAG_track_constant_fields) {
Isolate* isolate = map->GetIsolate();
Representation representation = constant->OptimalRepresentation();
Handle<FieldType> type = constant->OptimalType(isolate, representation);
return CopyWithField(map, name, type, attributes, kConst, representation,
flag);
} else {
// Allocate new instance descriptors with (name, constant) added.
Descriptor d = Descriptor::DataConstant(name, 0, constant, attributes);
Handle<Map> new_map = Map::CopyAddDescriptor(map, &d, flag);
return new_map;
}
}
const char* Representation::Mnemonic() const {
switch (kind_) {
case kNone: return "v";
case kTagged: return "t";
case kSmi: return "s";
case kDouble: return "d";
case kInteger32: return "i";
case kHeapObject: return "h";
case kExternal: return "x";
default:
UNREACHABLE();
return NULL;
}
}
bool Map::TransitionRemovesTaggedField(Map* target) {
int inobject = GetInObjectProperties();
int target_inobject = target->GetInObjectProperties();
for (int i = target_inobject; i < inobject; i++) {
FieldIndex index = FieldIndex::ForPropertyIndex(this, i);
if (!IsUnboxedDoubleField(index)) return true;
}
return false;
}
bool Map::TransitionChangesTaggedFieldToUntaggedField(Map* target) {
int inobject = GetInObjectProperties();
int target_inobject = target->GetInObjectProperties();
int limit = Min(inobject, target_inobject);
for (int i = 0; i < limit; i++) {
FieldIndex index = FieldIndex::ForPropertyIndex(target, i);
if (!IsUnboxedDoubleField(index) && target->IsUnboxedDoubleField(index)) {
return true;
}
}
return false;
}
bool Map::TransitionRequiresSynchronizationWithGC(Map* target) {
return TransitionRemovesTaggedField(target) ||
TransitionChangesTaggedFieldToUntaggedField(target);
}
bool Map::InstancesNeedRewriting(Map* target) {
int target_number_of_fields = target->NumberOfFields();
int target_inobject = target->GetInObjectProperties();
int target_unused = target->unused_property_fields();
int old_number_of_fields;
return InstancesNeedRewriting(target, target_number_of_fields,
target_inobject, target_unused,
&old_number_of_fields);
}
bool Map::InstancesNeedRewriting(Map* target, int target_number_of_fields,
int target_inobject, int target_unused,
int* old_number_of_fields) {
// If fields were added (or removed), rewrite the instance.
*old_number_of_fields = NumberOfFields();
DCHECK(target_number_of_fields >= *old_number_of_fields);
if (target_number_of_fields != *old_number_of_fields) return true;
// If smi descriptors were replaced by double descriptors, rewrite.
DescriptorArray* old_desc = instance_descriptors();
DescriptorArray* new_desc = target->instance_descriptors();
int limit = NumberOfOwnDescriptors();
for (int i = 0; i < limit; i++) {
if (new_desc->GetDetails(i).representation().IsDouble() !=
old_desc->GetDetails(i).representation().IsDouble()) {
return true;
}
}
// If no fields were added, and no inobject properties were removed, setting
// the map is sufficient.
if (target_inobject == GetInObjectProperties()) return false;
// In-object slack tracking may have reduced the object size of the new map.
// In that case, succeed if all existing fields were inobject, and they still
// fit within the new inobject size.
DCHECK(target_inobject < GetInObjectProperties());
if (target_number_of_fields <= target_inobject) {
DCHECK(target_number_of_fields + target_unused == target_inobject);
return false;
}
// Otherwise, properties will need to be moved to the backing store.
return true;
}
// static
void JSObject::UpdatePrototypeUserRegistration(Handle<Map> old_map,
Handle<Map> new_map,
Isolate* isolate) {
DCHECK(old_map->is_prototype_map());
DCHECK(new_map->is_prototype_map());
bool was_registered = JSObject::UnregisterPrototypeUser(old_map, isolate);
new_map->set_prototype_info(old_map->prototype_info());
old_map->set_prototype_info(Smi::kZero);
if (FLAG_trace_prototype_users) {
PrintF("Moving prototype_info %p from map %p to map %p.\n",
reinterpret_cast<void*>(new_map->prototype_info()),
reinterpret_cast<void*>(*old_map),
reinterpret_cast<void*>(*new_map));
}
if (was_registered) {
if (new_map->prototype_info()->IsPrototypeInfo()) {
// The new map isn't registered with its prototype yet; reflect this fact
// in the PrototypeInfo it just inherited from the old map.
PrototypeInfo::cast(new_map->prototype_info())
->set_registry_slot(PrototypeInfo::UNREGISTERED);
}
JSObject::LazyRegisterPrototypeUser(new_map, isolate);
}
}
namespace {
// To migrate a fast instance to a fast map:
// - First check whether the instance needs to be rewritten. If not, simply
// change the map.
// - Otherwise, allocate a fixed array large enough to hold all fields, in
// addition to unused space.
// - Copy all existing properties in, in the following order: backing store
// properties, unused fields, inobject properties.
// - If all allocation succeeded, commit the state atomically:
// * Copy inobject properties from the backing store back into the object.
// * Trim the difference in instance size of the object. This also cleanly
// frees inobject properties that moved to the backing store.
// * If there are properties left in the backing store, trim of the space used
// to temporarily store the inobject properties.
// * If there are properties left in the backing store, install the backing
// store.
void MigrateFastToFast(Handle<JSObject> object, Handle<Map> new_map) {
Isolate* isolate = object->GetIsolate();
Handle<Map> old_map(object->map());
// In case of a regular transition.
if (new_map->GetBackPointer() == *old_map) {
// If the map does not add named properties, simply set the map.
if (old_map->NumberOfOwnDescriptors() ==
new_map->NumberOfOwnDescriptors()) {
object->synchronized_set_map(*new_map);
return;
}
PropertyDetails details = new_map->GetLastDescriptorDetails();
// Either new_map adds an kDescriptor property, or a kField property for
// which there is still space, and which does not require a mutable double
// box (an out-of-object double).
if (details.location() == kDescriptor ||
(old_map->unused_property_fields() > 0 &&
((FLAG_unbox_double_fields && object->properties()->length() == 0) ||
!details.representation().IsDouble()))) {
object->synchronized_set_map(*new_map);
return;
}
// If there is still space in the object, we need to allocate a mutable
// double box.
if (old_map->unused_property_fields() > 0) {
FieldIndex index =
FieldIndex::ForDescriptor(*new_map, new_map->LastAdded());
DCHECK(details.representation().IsDouble());
DCHECK(!new_map->IsUnboxedDoubleField(index));
Handle<Object> value = isolate->factory()->NewMutableHeapNumber();
object->RawFastPropertyAtPut(index, *value);
object->synchronized_set_map(*new_map);
return;
}
// This migration is a transition from a map that has run out of property
// space. Extend the backing store.
int grow_by = new_map->unused_property_fields() + 1;
Handle<FixedArray> old_storage = handle(object->properties(), isolate);
Handle<FixedArray> new_storage =
isolate->factory()->CopyFixedArrayAndGrow(old_storage, grow_by);
// Properly initialize newly added property.
Handle<Object> value;
if (details.representation().IsDouble()) {
value = isolate->factory()->NewMutableHeapNumber();
} else {
value = isolate->factory()->uninitialized_value();
}
DCHECK_EQ(kField, details.location());
DCHECK_EQ(kData, details.kind());
int target_index = details.field_index() - new_map->GetInObjectProperties();
DCHECK(target_index >= 0); // Must be a backing store index.
new_storage->set(target_index, *value);
// From here on we cannot fail and we shouldn't GC anymore.
DisallowHeapAllocation no_allocation;
// Set the new property value and do the map transition.
object->set_properties(*new_storage);
object->synchronized_set_map(*new_map);
return;
}
int old_number_of_fields;
int number_of_fields = new_map->NumberOfFields();
int inobject = new_map->GetInObjectProperties();
int unused = new_map->unused_property_fields();
// Nothing to do if no functions were converted to fields and no smis were
// converted to doubles.
if (!old_map->InstancesNeedRewriting(*new_map, number_of_fields, inobject,
unused, &old_number_of_fields)) {
object->synchronized_set_map(*new_map);
return;
}
int total_size = number_of_fields + unused;
int external = total_size - inobject;
Handle<FixedArray> array = isolate->factory()->NewFixedArray(total_size);
Handle<DescriptorArray> old_descriptors(old_map->instance_descriptors());
Handle<DescriptorArray> new_descriptors(new_map->instance_descriptors());
int old_nof = old_map->NumberOfOwnDescriptors();
int new_nof = new_map->NumberOfOwnDescriptors();
// This method only supports generalizing instances to at least the same
// number of properties.
DCHECK(old_nof <= new_nof);
for (int i = 0; i < old_nof; i++) {
PropertyDetails details = new_descriptors->GetDetails(i);
if (details.location() != kField) continue;
DCHECK_EQ(kData, details.kind());
PropertyDetails old_details = old_descriptors->GetDetails(i);
Representation old_representation = old_details.representation();
Representation representation = details.representation();
Handle<Object> value;
if (old_details.location() == kDescriptor) {
if (old_details.kind() == kAccessor) {
// In case of kAccessor -> kData property reconfiguration, the property
// must already be prepared for data of certain type.
DCHECK(!details.representation().IsNone());
if (details.representation().IsDouble()) {
value = isolate->factory()->NewMutableHeapNumber();
} else {
value = isolate->factory()->uninitialized_value();
}
} else {
DCHECK_EQ(kData, old_details.kind());
value = handle(old_descriptors->GetValue(i), isolate);
DCHECK(!old_representation.IsDouble() && !representation.IsDouble());
}
} else {
DCHECK_EQ(kField, old_details.location());
FieldIndex index = FieldIndex::ForDescriptor(*old_map, i);
if (object->IsUnboxedDoubleField(index)) {
uint64_t old_bits = object->RawFastDoublePropertyAsBitsAt(index);
value = isolate->factory()->NewHeapNumberFromBits(
old_bits, representation.IsDouble() ? MUTABLE : IMMUTABLE);
} else {
value = handle(object->RawFastPropertyAt(index), isolate);
if (!old_representation.IsDouble() && representation.IsDouble()) {
DCHECK_IMPLIES(old_representation.IsNone(),
value->IsUninitialized(isolate));
value = Object::NewStorageFor(isolate, value, representation);
} else if (old_representation.IsDouble() &&
!representation.IsDouble()) {
value = Object::WrapForRead(isolate, value, old_representation);
}
}
}
DCHECK(!(representation.IsDouble() && value->IsSmi()));
int target_index = new_descriptors->GetFieldIndex(i) - inobject;
if (target_index < 0) target_index += total_size;
array->set(target_index, *value);
}
for (int i = old_nof; i < new_nof; i++) {
PropertyDetails details = new_descriptors->GetDetails(i);
if (details.location() != kField) continue;
DCHECK_EQ(kData, details.kind());
Handle<Object> value;
if (details.representation().IsDouble()) {
value = isolate->factory()->NewMutableHeapNumber();
} else {
value = isolate->factory()->uninitialized_value();
}
int target_index = new_descriptors->GetFieldIndex(i) - inobject;
if (target_index < 0) target_index += total_size;
array->set(target_index, *value);
}
// From here on we cannot fail and we shouldn't GC anymore.
DisallowHeapAllocation no_allocation;
Heap* heap = isolate->heap();
heap->NotifyObjectLayoutChange(*object, no_allocation);
// Copy (real) inobject properties. If necessary, stop at number_of_fields to
// avoid overwriting |one_pointer_filler_map|.
int limit = Min(inobject, number_of_fields);
for (int i = 0; i < limit; i++) {
FieldIndex index = FieldIndex::ForPropertyIndex(*new_map, i);
Object* value = array->get(external + i);
// Can't use JSObject::FastPropertyAtPut() because proper map was not set
// yet.
if (new_map->IsUnboxedDoubleField(index)) {
DCHECK(value->IsMutableHeapNumber());
// Ensure that all bits of the double value are preserved.
object->RawFastDoublePropertyAsBitsAtPut(
index, HeapNumber::cast(value)->value_as_bits());
if (i < old_number_of_fields && !old_map->IsUnboxedDoubleField(index)) {
// Transition from tagged to untagged slot.
heap->ClearRecordedSlot(*object,
HeapObject::RawField(*object, index.offset()));
} else {
DCHECK(!heap->HasRecordedSlot(
*object, HeapObject::RawField(*object, index.offset())));
}
} else {
object->RawFastPropertyAtPut(index, value);
}
}
// If there are properties in the new backing store, trim it to the correct
// size and install the backing store into the object.
if (external > 0) {
heap->RightTrimFixedArray(*array, inobject);
object->set_properties(*array);
}
// Create filler object past the new instance size.
int new_instance_size = new_map->instance_size();
int instance_size_delta = old_map->instance_size() - new_instance_size;
DCHECK(instance_size_delta >= 0);
if (instance_size_delta > 0) {
Address address = object->address();
heap->CreateFillerObjectAt(address + new_instance_size, instance_size_delta,
ClearRecordedSlots::kYes);
heap->AdjustLiveBytes(*object, -instance_size_delta);
}
// We are storing the new map using release store after creating a filler for
// the left-over space to avoid races with the sweeper thread.
object->synchronized_set_map(*new_map);
}
void MigrateFastToSlow(Handle<JSObject> object, Handle<Map> new_map,
int expected_additional_properties) {
// The global object is always normalized.
DCHECK(!object->IsJSGlobalObject());
// JSGlobalProxy must never be normalized
DCHECK(!object->IsJSGlobalProxy());
Isolate* isolate = object->GetIsolate();
HandleScope scope(isolate);
Handle<Map> map(object->map());
// Allocate new content.
int real_size = map->NumberOfOwnDescriptors();
int property_count = real_size;
if (expected_additional_properties > 0) {
property_count += expected_additional_properties;
} else {
// Make space for two more properties.
property_count += NameDictionary::kInitialCapacity;
}
Handle<NameDictionary> dictionary =
NameDictionary::New(isolate, property_count);
Handle<DescriptorArray> descs(map->instance_descriptors());
for (int i = 0; i < real_size; i++) {
PropertyDetails details = descs->GetDetails(i);
Handle<Name> key(descs->GetKey(i));
Handle<Object> value;
if (details.location() == kField) {
FieldIndex index = FieldIndex::ForDescriptor(*map, i);
if (details.kind() == kData) {
if (object->IsUnboxedDoubleField(index)) {
double old_value = object->RawFastDoublePropertyAt(index);
value = isolate->factory()->NewHeapNumber(old_value);
} else {
value = handle(object->RawFastPropertyAt(index), isolate);
if (details.representation().IsDouble()) {
DCHECK(value->IsMutableHeapNumber());
Handle<HeapNumber> old = Handle<HeapNumber>::cast(value);
value = isolate->factory()->NewHeapNumber(old->value());
}
}
} else {
DCHECK_EQ(kAccessor, details.kind());
value = handle(object->RawFastPropertyAt(index), isolate);
}
} else {
DCHECK_EQ(kDescriptor, details.location());
value = handle(descs->GetValue(i), isolate);
}
DCHECK(!value.is_null());
PropertyDetails d(details.kind(), details.attributes(), i + 1,
PropertyCellType::kNoCell);
dictionary = NameDictionary::Add(dictionary, key, value, d);
}
// Copy the next enumeration index from instance descriptor.
dictionary->SetNextEnumerationIndex(real_size + 1);
// From here on we cannot fail and we shouldn't GC anymore.
DisallowHeapAllocation no_allocation;
Heap* heap = isolate->heap();
heap->NotifyObjectLayoutChange(*object, no_allocation);
// Resize the object in the heap if necessary.
int new_instance_size = new_map->instance_size();
int instance_size_delta = map->instance_size() - new_instance_size;
DCHECK(instance_size_delta >= 0);
if (instance_size_delta > 0) {
heap->CreateFillerObjectAt(object->address() + new_instance_size,
instance_size_delta, ClearRecordedSlots::kYes);
heap->AdjustLiveBytes(*object, -instance_size_delta);
}
// We are storing the new map using release store after creating a filler for
// the left-over space to avoid races with the sweeper thread.
object->synchronized_set_map(*new_map);
object->set_properties(*dictionary);
// Ensure that in-object space of slow-mode object does not contain random
// garbage.
int inobject_properties = new_map->GetInObjectProperties();
if (inobject_properties) {
Heap* heap = isolate->heap();
heap->ClearRecordedSlotRange(
object->address() + map->GetInObjectPropertyOffset(0),
object->address() + new_instance_size);
for (int i = 0; i < inobject_properties; i++) {
FieldIndex index = FieldIndex::ForPropertyIndex(*new_map, i);
object->RawFastPropertyAtPut(index, Smi::kZero);
}
}
isolate->counters()->props_to_dictionary()->Increment();
#ifdef DEBUG
if (FLAG_trace_normalization) {
OFStream os(stdout);
os << "Object properties have been normalized:\n";
object->Print(os);
}
#endif
}
} // namespace
// static
void JSObject::NotifyMapChange(Handle<Map> old_map, Handle<Map> new_map,
Isolate* isolate) {
if (!old_map->is_prototype_map()) return;
InvalidatePrototypeChains(*old_map);
// If the map was registered with its prototype before, ensure that it
// registers with its new prototype now. This preserves the invariant that
// when a map on a prototype chain is registered with its prototype, then
// all prototypes further up the chain are also registered with their
// respective prototypes.
UpdatePrototypeUserRegistration(old_map, new_map, isolate);
}
void JSObject::MigrateToMap(Handle<JSObject> object, Handle<Map> new_map,
int expected_additional_properties) {
if (object->map() == *new_map) return;
Handle<Map> old_map(object->map());
NotifyMapChange(old_map, new_map, new_map->GetIsolate());
if (old_map->is_dictionary_map()) {
// For slow-to-fast migrations JSObject::MigrateSlowToFast()
// must be used instead.
CHECK(new_map->is_dictionary_map());
// Slow-to-slow migration is trivial.
object->set_map(*new_map);
} else if (!new_map->is_dictionary_map()) {
MigrateFastToFast(object, new_map);
if (old_map->is_prototype_map()) {
DCHECK(!old_map->is_stable());
DCHECK(new_map->is_stable());
// Clear out the old descriptor array to avoid problems to sharing
// the descriptor array without using an explicit.
old_map->InitializeDescriptors(
old_map->GetHeap()->empty_descriptor_array(),
LayoutDescriptor::FastPointerLayout());
// Ensure that no transition was inserted for prototype migrations.
DCHECK_EQ(
0, TransitionArray::NumberOfTransitions(old_map->raw_transitions()));
DCHECK(new_map->GetBackPointer()->IsUndefined(new_map->GetIsolate()));
}
} else {
MigrateFastToSlow(object, new_map, expected_additional_properties);
}
// Careful: Don't allocate here!
// For some callers of this method, |object| might be in an inconsistent
// state now: the new map might have a new elements_kind, but the object's
// elements pointer hasn't been updated yet. Callers will fix this, but in
// the meantime, (indirectly) calling JSObjectVerify() must be avoided.
// When adding code here, add a DisallowHeapAllocation too.
}
void JSObject::ForceSetPrototype(Handle<JSObject> object,
Handle<Object> proto) {
// object.__proto__ = proto;
Handle<Map> old_map = Handle<Map>(object->map());
Handle<Map> new_map = Map::Copy(old_map, "ForceSetPrototype");
Map::SetPrototype(new_map, proto, FAST_PROTOTYPE);
JSObject::MigrateToMap(object, new_map);
}
int Map::NumberOfFields() {
DescriptorArray* descriptors = instance_descriptors();
int result = 0;
for (int i = 0; i < NumberOfOwnDescriptors(); i++) {
if (descriptors->GetDetails(i).location() == kField) result++;
}
return result;
}
void DescriptorArray::GeneralizeAllFields() {
int length = number_of_descriptors();
for (int i = 0; i < length; i++) {
PropertyDetails details = GetDetails(i);
details = details.CopyWithRepresentation(Representation::Tagged());
if (details.location() == kField) {
DCHECK_EQ(kData, details.kind());
details = details.CopyWithConstness(kMutable);
SetValue(i, FieldType::Any());
}
set(ToDetailsIndex(i), details.AsSmi());
}
}
Handle<Map> Map::CopyGeneralizeAllFields(Handle<Map> map,
ElementsKind elements_kind,
int modify_index, PropertyKind kind,
PropertyAttributes attributes,
const char* reason) {
Isolate* isolate = map->GetIsolate();
Handle<DescriptorArray> old_descriptors(map->instance_descriptors(), isolate);
int number_of_own_descriptors = map->NumberOfOwnDescriptors();
Handle<DescriptorArray> descriptors =
DescriptorArray::CopyUpTo(old_descriptors, number_of_own_descriptors);
descriptors->GeneralizeAllFields();
Handle<LayoutDescriptor> new_layout_descriptor(
LayoutDescriptor::FastPointerLayout(), isolate);
Handle<Map> new_map = CopyReplaceDescriptors(
map, descriptors, new_layout_descriptor, OMIT_TRANSITION,
MaybeHandle<Name>(), reason, SPECIAL_TRANSITION);
// Unless the instance is being migrated, ensure that modify_index is a field.
if (modify_index >= 0) {
PropertyDetails details = descriptors->GetDetails(modify_index);
if (details.constness() != kMutable || details.location() != kField ||
details.attributes() != attributes) {
int field_index = details.location() == kField
? details.field_index()
: new_map->NumberOfFields();
Descriptor d = Descriptor::DataField(
handle(descriptors->GetKey(modify_index), isolate), field_index,
attributes, Representation::Tagged());
descriptors->Replace(modify_index, &d);
if (details.location() != kField) {
int unused_property_fields = new_map->unused_property_fields() - 1;
if (unused_property_fields < 0) {
unused_property_fields += JSObject::kFieldsAdded;
}
new_map->set_unused_property_fields(unused_property_fields);
}
} else {
DCHECK(details.attributes() == attributes);
}
if (FLAG_trace_generalization) {
MaybeHandle<FieldType> field_type = FieldType::None(isolate);
if (details.location() == kField) {
field_type = handle(
map->instance_descriptors()->GetFieldType(modify_index), isolate);
}
map->PrintGeneralization(
stdout, reason, modify_index, new_map->NumberOfOwnDescriptors(),
new_map->NumberOfOwnDescriptors(), details.location() == kDescriptor,
details.representation(), Representation::Tagged(), field_type,
MaybeHandle<Object>(), FieldType::Any(isolate),
MaybeHandle<Object>());
}
}
new_map->set_elements_kind(elements_kind);
return new_map;
}
void Map::DeprecateTransitionTree() {
if (is_deprecated()) return;
Object* transitions = raw_transitions();
int num_transitions = TransitionArray::NumberOfTransitions(transitions);
for (int i = 0; i < num_transitions; ++i) {
TransitionArray::GetTarget(transitions, i)->DeprecateTransitionTree();
}
deprecate();
dependent_code()->DeoptimizeDependentCodeGroup(
GetIsolate(), DependentCode::kTransitionGroup);
NotifyLeafMapLayoutChange();
}
// Installs |new_descriptors| over the current instance_descriptors to ensure
// proper sharing of descriptor arrays.
void Map::ReplaceDescriptors(DescriptorArray* new_descriptors,
LayoutDescriptor* new_layout_descriptor) {
Isolate* isolate = GetIsolate();
// Don't overwrite the empty descriptor array or initial map's descriptors.
if (NumberOfOwnDescriptors() == 0 || GetBackPointer()->IsUndefined(isolate)) {
return;
}
DescriptorArray* to_replace = instance_descriptors();
isolate->heap()->incremental_marking()->IterateBlackObject(to_replace);
Map* current = this;
while (current->instance_descriptors() == to_replace) {
Object* next = current->GetBackPointer();
if (next->IsUndefined(isolate)) break; // Stop overwriting at initial map.
current->SetEnumLength(kInvalidEnumCacheSentinel);
current->UpdateDescriptors(new_descriptors, new_layout_descriptor);
current = Map::cast(next);
}
set_owns_descriptors(false);
}
Map* Map::FindRootMap() {
Map* result = this;
Isolate* isolate = GetIsolate();
while (true) {
Object* back = result->GetBackPointer();
if (back->IsUndefined(isolate)) {
// Initial map always owns descriptors and doesn't have unused entries
// in the descriptor array.
DCHECK(result->owns_descriptors());
DCHECK_EQ(result->NumberOfOwnDescriptors(),
result->instance_descriptors()->number_of_descriptors());
return result;
}
result = Map::cast(back);
}
}
Map* Map::FindFieldOwner(int descriptor) {
DisallowHeapAllocation no_allocation;
DCHECK_EQ(kField, instance_descriptors()->GetDetails(descriptor).location());
Map* result = this;
Isolate* isolate = GetIsolate();
while (true) {
Object* back = result->GetBackPointer();
if (back->IsUndefined(isolate)) break;
Map* parent = Map::cast(back);
if (parent->NumberOfOwnDescriptors() <= descriptor) break;
result = parent;
}
return result;
}
void Map::UpdateFieldType(int descriptor, Handle<Name> name,
PropertyConstness new_constness,
Representation new_representation,
Handle<Object> new_wrapped_type) {
DCHECK(new_wrapped_type->IsSmi() || new_wrapped_type->IsWeakCell());
// We store raw pointers in the queue, so no allocations are allowed.
DisallowHeapAllocation no_allocation;
PropertyDetails details = instance_descriptors()->GetDetails(descriptor);
if (details.location() != kField) return;
DCHECK_EQ(kData, details.kind());
Zone zone(GetIsolate()->allocator(), ZONE_NAME);
ZoneQueue<Map*> backlog(&zone);
backlog.push(this);
while (!backlog.empty()) {
Map* current = backlog.front();
backlog.pop();
Object* transitions = current->raw_transitions();
int num_transitions = TransitionArray::NumberOfTransitions(transitions);
for (int i = 0; i < num_transitions; ++i) {
Map* target = TransitionArray::GetTarget(transitions, i);
backlog.push(target);
}
DescriptorArray* descriptors = current->instance_descriptors();
PropertyDetails details = descriptors->GetDetails(descriptor);
// Currently constness change implies map change.
DCHECK_EQ(new_constness, details.constness());
// It is allowed to change representation here only from None to something.
DCHECK(details.representation().Equals(new_representation) ||
details.representation().IsNone());
// Skip if already updated the shared descriptor.
if (descriptors->GetValue(descriptor) != *new_wrapped_type) {
DCHECK_IMPLIES(!FLAG_track_constant_fields, new_constness == kMutable);
Descriptor d = Descriptor::DataField(
name, descriptors->GetFieldIndex(descriptor), details.attributes(),
new_constness, new_representation, new_wrapped_type);
descriptors->Replace(descriptor, &d);
}
}
}
bool FieldTypeIsCleared(Representation rep, FieldType* type) {
return type->IsNone() && rep.IsHeapObject();
}
// static
Handle<FieldType> Map::GeneralizeFieldType(Representation rep1,
Handle<FieldType> type1,
Representation rep2,
Handle<FieldType> type2,
Isolate* isolate) {
// Cleared field types need special treatment. They represent lost knowledge,
// so we must be conservative, so their generalization with any other type
// is "Any".
if (FieldTypeIsCleared(rep1, *type1) || FieldTypeIsCleared(rep2, *type2)) {
return FieldType::Any(isolate);
}
if (type1->NowIs(type2)) return type2;
if (type2->NowIs(type1)) return type1;
return FieldType::Any(isolate);
}
// static
void Map::GeneralizeField(Handle<Map> map, int modify_index,
PropertyConstness new_constness,
Representation new_representation,
Handle<FieldType> new_field_type) {
Isolate* isolate = map->GetIsolate();
// Check if we actually need to generalize the field type at all.
Handle<DescriptorArray> old_descriptors(map->instance_descriptors(), isolate);
PropertyDetails old_details = old_descriptors->GetDetails(modify_index);
PropertyConstness old_constness = old_details.constness();
Representation old_representation = old_details.representation();
Handle<FieldType> old_field_type(old_descriptors->GetFieldType(modify_index),
isolate);
if (old_constness == new_constness &&
old_representation.Equals(new_representation) &&
!FieldTypeIsCleared(new_representation, *new_field_type) &&
// Checking old_field_type for being cleared is not necessary because
// the NowIs check below would fail anyway in that case.
new_field_type->NowIs(old_field_type)) {
DCHECK(GeneralizeFieldType(old_representation, old_field_type,
new_representation, new_field_type, isolate)
->NowIs(old_field_type));
return;
}
// Determine the field owner.
Handle<Map> field_owner(map->FindFieldOwner(modify_index), isolate);
Handle<DescriptorArray> descriptors(
field_owner->instance_descriptors(), isolate);
DCHECK_EQ(*old_field_type, descriptors->GetFieldType(modify_index));
new_field_type =
Map::GeneralizeFieldType(old_representation, old_field_type,
new_representation, new_field_type, isolate);
PropertyDetails details = descriptors->GetDetails(modify_index);
Handle<Name> name(descriptors->GetKey(modify_index));
Handle<Object> wrapped_type(WrapFieldType(new_field_type));
field_owner->UpdateFieldType(modify_index, name, new_constness,
new_representation, wrapped_type);
field_owner->dependent_code()->DeoptimizeDependentCodeGroup(
isolate, DependentCode::kFieldOwnerGroup);
if (FLAG_trace_generalization) {
map->PrintGeneralization(
stdout, "field type generalization", modify_index,
map->NumberOfOwnDescriptors(), map->NumberOfOwnDescriptors(), false,
details.representation(), details.representation(), old_field_type,
MaybeHandle<Object>(), new_field_type, MaybeHandle<Object>());
}
}
// TODO(ishell): remove.
// static
Handle<Map> Map::ReconfigureProperty(Handle<Map> map, int modify_index,
PropertyKind new_kind,
PropertyAttributes new_attributes,
Representation new_representation,
Handle<FieldType> new_field_type) {
DCHECK_EQ(kData, new_kind); // Only kData case is supported.
MapUpdater mu(map->GetIsolate(), map);
return mu.ReconfigureToDataField(modify_index, new_attributes, kConst,
new_representation, new_field_type);
}
// TODO(ishell): remove.
// static
Handle<Map> Map::ReconfigureElementsKind(Handle<Map> map,
ElementsKind new_elements_kind) {
MapUpdater mu(map->GetIsolate(), map);
return mu.ReconfigureElementsKind(new_elements_kind);
}
// Generalize all fields and update the transition tree.
Handle<Map> Map::GeneralizeAllFields(Handle<Map> map) {
Isolate* isolate = map->GetIsolate();
Handle<FieldType> any_type = FieldType::Any(isolate);
Handle<DescriptorArray> descriptors(map->instance_descriptors());
for (int i = 0; i < map->NumberOfOwnDescriptors(); ++i) {
PropertyDetails details = descriptors->GetDetails(i);
if (details.location() == kField) {
DCHECK_EQ(kData, details.kind());
MapUpdater mu(isolate, map);
map = mu.ReconfigureToDataField(i, details.attributes(), kMutable,
Representation::Tagged(), any_type);
}
}
return map;
}
// static
MaybeHandle<Map> Map::TryUpdate(Handle<Map> old_map) {
DisallowHeapAllocation no_allocation;
DisallowDeoptimization no_deoptimization(old_map->GetIsolate());
if (!old_map->is_deprecated()) return old_map;
// Check the state of the root map.
Map* root_map = old_map->FindRootMap();
if (!old_map->EquivalentToForTransition(root_map)) return MaybeHandle<Map>();
ElementsKind from_kind = root_map->elements_kind();
ElementsKind to_kind = old_map->elements_kind();
if (from_kind != to_kind) {
// Try to follow existing elements kind transitions.
root_map = root_map->LookupElementsTransitionMap(to_kind);
if (root_map == NULL) return MaybeHandle<Map>();
// From here on, use the map with correct elements kind as root map.
}
Map* new_map = root_map->TryReplayPropertyTransitions(*old_map);
if (new_map == nullptr) return MaybeHandle<Map>();
return handle(new_map);
}
Map* Map::TryReplayPropertyTransitions(Map* old_map) {
DisallowHeapAllocation no_allocation;
DisallowDeoptimization no_deoptimization(GetIsolate());
int root_nof = NumberOfOwnDescriptors();
int old_nof = old_map->NumberOfOwnDescriptors();
DescriptorArray* old_descriptors = old_map->instance_descriptors();
Map* new_map = this;
for (int i = root_nof; i < old_nof; ++i) {
PropertyDetails old_details = old_descriptors->GetDetails(i);
Map* transition = TransitionArray::SearchTransition(
new_map, old_details.kind(), old_descriptors->GetKey(i),
old_details.attributes());
if (transition == NULL) return nullptr;
new_map = transition;
DescriptorArray* new_descriptors = new_map->instance_descriptors();
PropertyDetails new_details = new_descriptors->GetDetails(i);
DCHECK_EQ(old_details.kind(), new_details.kind());
DCHECK_EQ(old_details.attributes(), new_details.attributes());
if (!IsGeneralizableTo(old_details.constness(), new_details.constness())) {
return nullptr;
}
DCHECK(IsGeneralizableTo(old_details.location(), new_details.location()));
if (!old_details.representation().fits_into(new_details.representation())) {
return nullptr;
}
if (new_details.location() == kField) {
if (new_details.kind() == kData) {
FieldType* new_type = new_descriptors->GetFieldType(i);
// Cleared field types need special treatment. They represent lost
// knowledge, so we must first generalize the new_type to "Any".
if (FieldTypeIsCleared(new_details.representation(), new_type)) {
return nullptr;
}
DCHECK_EQ(kData, old_details.kind());
if (old_details.location() == kField) {
FieldType* old_type = old_descriptors->GetFieldType(i);
if (FieldTypeIsCleared(old_details.representation(), old_type) ||
!old_type->NowIs(new_type)) {
return nullptr;
}
} else {
DCHECK_EQ(kDescriptor, old_details.location());
DCHECK(!FLAG_track_constant_fields);
Object* old_value = old_descriptors->GetValue(i);
if (!new_type->NowContains(old_value)) {
return nullptr;
}
}
} else {
DCHECK_EQ(kAccessor, new_details.kind());
#ifdef DEBUG
FieldType* new_type = new_descriptors->GetFieldType(i);
DCHECK(new_type->IsAny());
#endif
UNREACHABLE();
}
} else {
DCHECK_EQ(kDescriptor, new_details.location());
Object* old_value = old_descriptors->GetValue(i);
Object* new_value = new_descriptors->GetValue(i);
if (old_details.location() == kField || old_value != new_value) {
return nullptr;
}
}
}
if (new_map->NumberOfOwnDescriptors() != old_nof) return nullptr;
return new_map;
}
// static
Handle<Map> Map::Update(Handle<Map> map) {
if (!map->is_deprecated()) return map;
MapUpdater mu(map->GetIsolate(), map);
return mu.Update();
}
Maybe<bool> JSObject::SetPropertyWithInterceptor(LookupIterator* it,
ShouldThrow should_throw,
Handle<Object> value) {
DCHECK_EQ(LookupIterator::INTERCEPTOR, it->state());
return SetPropertyWithInterceptorInternal(it, it->GetInterceptor(),
should_throw, value);
}
MaybeHandle<Object> Object::SetProperty(Handle<Object> object,
Handle<Name> name, Handle<Object> value,
LanguageMode language_mode,
StoreFromKeyed store_mode) {
LookupIterator it(object, name);
MAYBE_RETURN_NULL(SetProperty(&it, value, language_mode, store_mode));
return value;
}
Maybe<bool> Object::SetPropertyInternal(LookupIterator* it,
Handle<Object> value,
LanguageMode language_mode,
StoreFromKeyed store_mode,
bool* found) {
it->UpdateProtector();
DCHECK(it->IsFound());
ShouldThrow should_throw =
is_sloppy(language_mode) ? DONT_THROW : THROW_ON_ERROR;
// Make sure that the top context does not change when doing callbacks or
// interceptor calls.
AssertNoContextChange ncc(it->isolate());
do {
switch (it->state()) {
case LookupIterator::NOT_FOUND:
UNREACHABLE();
case LookupIterator::ACCESS_CHECK:
if (it->HasAccess()) break;
// Check whether it makes sense to reuse the lookup iterator. Here it
// might still call into setters up the prototype chain.
return JSObject::SetPropertyWithFailedAccessCheck(it, value,
should_throw);
case LookupIterator::JSPROXY:
return JSProxy::SetProperty(it->GetHolder<JSProxy>(), it->GetName(),
value, it->GetReceiver(), language_mode);
case LookupIterator::INTERCEPTOR: {
if (it->HolderIsReceiverOrHiddenPrototype()) {
Maybe<bool> result =
JSObject::SetPropertyWithInterceptor(it, should_throw, value);
if (result.IsNothing() || result.FromJust()) return result;
} else {
Maybe<PropertyAttributes> maybe_attributes =
JSObject::GetPropertyAttributesWithInterceptor(it);
if (!maybe_attributes.IsJust()) return Nothing<bool>();
if ((maybe_attributes.FromJust() & READ_ONLY) != 0) {
return WriteToReadOnlyProperty(it, value, should_throw);
}
if (maybe_attributes.FromJust() == ABSENT) break;
*found = false;
return Nothing<bool>();
}
break;
}
case LookupIterator::ACCESSOR: {
if (it->IsReadOnly()) {
return WriteToReadOnlyProperty(it, value, should_throw);
}
Handle<Object> accessors = it->GetAccessors();
if (accessors->IsAccessorInfo() &&
!it->HolderIsReceiverOrHiddenPrototype() &&
AccessorInfo::cast(*accessors)->is_special_data_property()) {
*found = false;
return Nothing<bool>();
}
return SetPropertyWithAccessor(it, value, should_throw);
}
case LookupIterator::INTEGER_INDEXED_EXOTIC:
// TODO(verwaest): We should throw an exception if holder is receiver.
return Just(true);
case LookupIterator::DATA:
if (it->IsReadOnly()) {
return WriteToReadOnlyProperty(it, value, should_throw);
}
if (it->HolderIsReceiverOrHiddenPrototype()) {
return SetDataProperty(it, value);
}
// Fall through.
case LookupIterator::TRANSITION:
*found = false;
return Nothing<bool>();
}
it->Next();
} while (it->IsFound());
*found = false;
return Nothing<bool>();
}
Maybe<bool> Object::SetProperty(LookupIterator* it, Handle<Object> value,
LanguageMode language_mode,
StoreFromKeyed store_mode) {
if (it->IsFound()) {
bool found = true;
Maybe<bool> result =
SetPropertyInternal(it, value, language_mode, store_mode, &found);
if (found) return result;
}
// If the receiver is the JSGlobalObject, the store was contextual. In case
// the property did not exist yet on the global object itself, we have to
// throw a reference error in strict mode. In sloppy mode, we continue.
if (is_strict(language_mode) && it->GetReceiver()->IsJSGlobalObject()) {
it->isolate()->Throw(*it->isolate()->factory()->NewReferenceError(
MessageTemplate::kNotDefined, it->name()));
return Nothing<bool>();
}
ShouldThrow should_throw =
is_sloppy(language_mode) ? DONT_THROW : THROW_ON_ERROR;
return AddDataProperty(it, value, NONE, should_throw, store_mode);
}
Maybe<bool> Object::SetSuperProperty(LookupIterator* it, Handle<Object> value,
LanguageMode language_mode,
StoreFromKeyed store_mode) {
Isolate* isolate = it->isolate();
if (it->IsFound()) {
bool found = true;
Maybe<bool> result =
SetPropertyInternal(it, value, language_mode, store_mode, &found);
if (found) return result;
}
it->UpdateProtector();
// The property either doesn't exist on the holder or exists there as a data
// property.
ShouldThrow should_throw =
is_sloppy(language_mode) ? DONT_THROW : THROW_ON_ERROR;
if (!it->GetReceiver()->IsJSReceiver()) {
return WriteToReadOnlyProperty(it, value, should_throw);
}
Handle<JSReceiver> receiver = Handle<JSReceiver>::cast(it->GetReceiver());
LookupIterator::Configuration c = LookupIterator::OWN;
LookupIterator own_lookup =
it->IsElement() ? LookupIterator(isolate, receiver, it->index(), c)
: LookupIterator(receiver, it->name(), c);
for (; own_lookup.IsFound(); own_lookup.Next()) {
switch (own_lookup.state()) {
case LookupIterator::ACCESS_CHECK:
if (!own_lookup.HasAccess()) {
return JSObject::SetPropertyWithFailedAccessCheck(&own_lookup, value,
should_throw);
}
break;
case LookupIterator::ACCESSOR:
if (own_lookup.GetAccessors()->IsAccessorInfo()) {
if (own_lookup.IsReadOnly()) {
return WriteToReadOnlyProperty(&own_lookup, value, should_throw);
}
return JSObject::SetPropertyWithAccessor(&own_lookup, value,
should_throw);
}
// Fall through.
case LookupIterator::INTEGER_INDEXED_EXOTIC:
return RedefineIncompatibleProperty(isolate, it->GetName(), value,
should_throw);
case LookupIterator::DATA: {
if (own_lookup.IsReadOnly()) {
return WriteToReadOnlyProperty(&own_lookup, value, should_throw);
}
return SetDataProperty(&own_lookup, value);
}
case LookupIterator::INTERCEPTOR:
case LookupIterator::JSPROXY: {
PropertyDescriptor desc;
Maybe<bool> owned =
JSReceiver::GetOwnPropertyDescriptor(&own_lookup, &desc);
MAYBE_RETURN(owned, Nothing<bool>());
if (!owned.FromJust()) {
return JSReceiver::CreateDataProperty(&own_lookup, value,
should_throw);
}
if (PropertyDescriptor::IsAccessorDescriptor(&desc) ||
!desc.writable()) {
return RedefineIncompatibleProperty(isolate, it->GetName(), value,
should_throw);
}
PropertyDescriptor value_desc;
value_desc.set_value(value);
return JSReceiver::DefineOwnProperty(isolate, receiver, it->GetName(),
&value_desc, should_throw);
}
case LookupIterator::NOT_FOUND:
case LookupIterator::TRANSITION:
UNREACHABLE();
}
}
return AddDataProperty(&own_lookup, value, NONE, should_throw, store_mode);
}
Maybe<bool> Object::CannotCreateProperty(Isolate* isolate,
Handle<Object> receiver,
Handle<Object> name,
Handle<Object> value,
ShouldThrow should_throw) {
RETURN_FAILURE(
isolate, should_throw,
NewTypeError(MessageTemplate::kStrictCannotCreateProperty, name,
Object::TypeOf(isolate, receiver), receiver));
}
Maybe<bool> Object::WriteToReadOnlyProperty(LookupIterator* it,
Handle<Object> value,
ShouldThrow should_throw) {
return WriteToReadOnlyProperty(it->isolate(), it->GetReceiver(),
it->GetName(), value, should_throw);
}
Maybe<bool> Object::WriteToReadOnlyProperty(Isolate* isolate,
Handle<Object> receiver,
Handle<Object> name,
Handle<Object> value,
ShouldThrow should_throw) {
RETURN_FAILURE(isolate, should_throw,
NewTypeError(MessageTemplate::kStrictReadOnlyProperty, name,
Object::TypeOf(isolate, receiver), receiver));
}
Maybe<bool> Object::RedefineIncompatibleProperty(Isolate* isolate,
Handle<Object> name,
Handle<Object> value,
ShouldThrow should_throw) {
RETURN_FAILURE(isolate, should_throw,
NewTypeError(MessageTemplate::kRedefineDisallowed, name));
}
Maybe<bool> Object::SetDataProperty(LookupIterator* it, Handle<Object> value) {
// Proxies are handled elsewhere. Other non-JSObjects cannot have own
// properties.
Handle<JSObject> receiver = Handle<JSObject>::cast(it->GetReceiver());
// Store on the holder which may be hidden behind the receiver.
DCHECK(it->HolderIsReceiverOrHiddenPrototype());
Handle<Object> to_assign = value;
// Convert the incoming value to a number for storing into typed arrays.
if (it->IsElement() && receiver->HasFixedTypedArrayElements()) {
if (!value->IsNumber() && !value->IsUndefined(it->isolate())) {
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
it->isolate(), to_assign, Object::ToNumber(value), Nothing<bool>());
// We have to recheck the length. However, it can only change if the
// underlying buffer was neutered, so just check that.
if (Handle<JSArrayBufferView>::cast(receiver)->WasNeutered()) {
return Just(true);
// TODO(neis): According to the spec, this should throw a TypeError.
}
}
}
// Possibly migrate to the most up-to-date map that will be able to store
// |value| under it->name().
it->PrepareForDataProperty(to_assign);
// Write the property value.
it->WriteDataValue(to_assign, false);
#if VERIFY_HEAP
if (FLAG_verify_heap) {
receiver->JSObjectVerify();
}
#endif
return Just(true);
}
Maybe<bool> Object::AddDataProperty(LookupIterator* it, Handle<Object> value,
PropertyAttributes attributes,
ShouldThrow should_throw,
StoreFromKeyed store_mode) {
if (!it->GetReceiver()->IsJSObject()) {
if (it->GetReceiver()->IsJSProxy() && it->GetName()->IsPrivate()) {
RETURN_FAILURE(it->isolate(), should_throw,
NewTypeError(MessageTemplate::kProxyPrivate));
}
return CannotCreateProperty(it->isolate(), it->GetReceiver(), it->GetName(),
value, should_throw);
}
DCHECK_NE(LookupIterator::INTEGER_INDEXED_EXOTIC, it->state());
Handle<JSObject> receiver = it->GetStoreTarget();
// If the receiver is a JSGlobalProxy, store on the prototype (JSGlobalObject)
// instead. If the prototype is Null, the proxy is detached.
if (receiver->IsJSGlobalProxy()) return Just(true);
Isolate* isolate = it->isolate();
if (it->ExtendingNonExtensible(receiver)) {
RETURN_FAILURE(
isolate, should_throw,
NewTypeError(MessageTemplate::kObjectNotExtensible, it->GetName()));
}
if (it->IsElement()) {
if (receiver->IsJSArray()) {
Handle<JSArray> array = Handle<JSArray>::cast(receiver);
if (JSArray::WouldChangeReadOnlyLength(array, it->index())) {
RETURN_FAILURE(array->GetIsolate(), should_throw,
NewTypeError(MessageTemplate::kStrictReadOnlyProperty,
isolate->factory()->length_string(),
Object::TypeOf(isolate, array), array));
}
if (FLAG_trace_external_array_abuse &&
array->HasFixedTypedArrayElements()) {
CheckArrayAbuse(array, "typed elements write", it->index(), true);
}
if (FLAG_trace_js_array_abuse && !array->HasFixedTypedArrayElements()) {
CheckArrayAbuse(array, "elements write", it->index(), false);
}
}
Maybe<bool> result = JSObject::AddDataElement(receiver, it->index(), value,
attributes, should_throw);
JSObject::ValidateElements(receiver);
return result;
} else {
it->UpdateProtector();
// Migrate to the most up-to-date map that will be able to store |value|
// under it->name() with |attributes|.
it->PrepareTransitionToDataProperty(receiver, value, attributes,
store_mode);
DCHECK_EQ(LookupIterator::TRANSITION, it->state());
it->ApplyTransitionToDataProperty(receiver);
// Write the property value.
it->WriteDataValue(value, true);
#if VERIFY_HEAP
if (FLAG_verify_heap) {
receiver->JSObjectVerify();
}
#endif
}
return Just(true);
}
void Map::EnsureDescriptorSlack(Handle<Map> map, int slack) {
// Only supports adding slack to owned descriptors.
DCHECK(map->owns_descriptors());
Handle<DescriptorArray> descriptors(map->instance_descriptors());
int old_size = map->NumberOfOwnDescriptors();
if (slack <= descriptors->NumberOfSlackDescriptors()) return;
Handle<DescriptorArray> new_descriptors = DescriptorArray::CopyUpTo(
descriptors, old_size, slack);
DisallowHeapAllocation no_allocation;
// The descriptors are still the same, so keep the layout descriptor.
LayoutDescriptor* layout_descriptor = map->GetLayoutDescriptor();
if (old_size == 0) {
map->UpdateDescriptors(*new_descriptors, layout_descriptor);
return;
}
// If the source descriptors had an enum cache we copy it. This ensures
// that the maps to which we push the new descriptor array back can rely
// on a cache always being available once it is set. If the map has more
// enumerated descriptors than available in the original cache, the cache
// will be lazily replaced by the extended cache when needed.
if (descriptors->HasEnumCache()) {
new_descriptors->CopyEnumCacheFrom(*descriptors);
}
Isolate* isolate = map->GetIsolate();
// Replace descriptors by new_descriptors in all maps that share it.
isolate->heap()->incremental_marking()->IterateBlackObject(*descriptors);
Map* current = *map;
while (current->instance_descriptors() == *descriptors) {
Object* next = current->GetBackPointer();
if (next->IsUndefined(isolate)) break; // Stop overwriting at initial map.
current->UpdateDescriptors(*new_descriptors, layout_descriptor);
current = Map::cast(next);
}
map->UpdateDescriptors(*new_descriptors, layout_descriptor);
}
// static
Handle<Map> Map::GetObjectCreateMap(Handle<HeapObject> prototype) {
Isolate* isolate = prototype->GetIsolate();
Handle<Map> map(isolate->native_context()->object_function()->initial_map(),
isolate);
if (map->prototype() == *prototype) return map;
if (prototype->IsNull(isolate)) {
return isolate->slow_object_with_null_prototype_map();
}
if (prototype->IsJSObject()) {
Handle<JSObject> js_prototype = Handle<JSObject>::cast(prototype);
if (!js_prototype->map()->is_prototype_map()) {
JSObject::OptimizeAsPrototype(js_prototype, FAST_PROTOTYPE);
}
Handle<PrototypeInfo> info =
Map::GetOrCreatePrototypeInfo(js_prototype, isolate);
// TODO(verwaest): Use inobject slack tracking for this map.
if (info->HasObjectCreateMap()) {
map = handle(info->ObjectCreateMap(), isolate);
} else {
map = Map::CopyInitialMap(map);
Map::SetPrototype(map, prototype, FAST_PROTOTYPE);
PrototypeInfo::SetObjectCreateMap(info, map);
}
return map;
}
return Map::TransitionToPrototype(map, prototype, REGULAR_PROTOTYPE);
}
template <class T>
static int AppendUniqueCallbacks(Handle<TemplateList> callbacks,
Handle<typename T::Array> array,
int valid_descriptors) {
int nof_callbacks = callbacks->length();
Isolate* isolate = array->GetIsolate();
// Ensure the keys are unique names before writing them into the
// instance descriptor. Since it may cause a GC, it has to be done before we
// temporarily put the heap in an invalid state while appending descriptors.
for (int i = 0; i < nof_callbacks; ++i) {
Handle<AccessorInfo> entry(AccessorInfo::cast(callbacks->get(i)));
if (entry->name()->IsUniqueName()) continue;
Handle<String> key =
isolate->factory()->InternalizeString(
Handle<String>(String::cast(entry->name())));
entry->set_name(*key);
}
// Fill in new callback descriptors. Process the callbacks from
// back to front so that the last callback with a given name takes
// precedence over previously added callbacks with that name.
for (int i = nof_callbacks - 1; i >= 0; i--) {
Handle<AccessorInfo> entry(AccessorInfo::cast(callbacks->get(i)));
Handle<Name> key(Name::cast(entry->name()));
// Check if a descriptor with this name already exists before writing.
if (!T::Contains(key, entry, valid_descriptors, array)) {
T::Insert(key, entry, valid_descriptors, array);
valid_descriptors++;
}
}
return valid_descriptors;
}
struct DescriptorArrayAppender {
typedef DescriptorArray Array;
static bool Contains(Handle<Name> key,
Handle<AccessorInfo> entry,
int valid_descriptors,
Handle<DescriptorArray> array) {
DisallowHeapAllocation no_gc;
return array->Search(*key, valid_descriptors) != DescriptorArray::kNotFound;
}
static void Insert(Handle<Name> key,
Handle<AccessorInfo> entry,
int valid_descriptors,
Handle<DescriptorArray> array) {
DisallowHeapAllocation no_gc;
Descriptor d =
Descriptor::AccessorConstant(key, entry, entry->property_attributes());
array->Append(&d);
}
};
struct FixedArrayAppender {
typedef FixedArray Array;
static bool Contains(Handle<Name> key,
Handle<AccessorInfo> entry,
int valid_descriptors,
Handle<FixedArray> array) {
for (int i = 0; i < valid_descriptors; i++) {
if (*key == AccessorInfo::cast(array->get(i))->name()) return true;
}
return false;
}
static void Insert(Handle<Name> key,
Handle<AccessorInfo> entry,
int valid_descriptors,
Handle<FixedArray> array) {
DisallowHeapAllocation no_gc;
array->set(valid_descriptors, *entry);
}
};
void Map::AppendCallbackDescriptors(Handle<Map> map,
Handle<Object> descriptors) {
int nof = map->NumberOfOwnDescriptors();
Handle<DescriptorArray> array(map->instance_descriptors());
Handle<TemplateList> callbacks = Handle<TemplateList>::cast(descriptors);
DCHECK_GE(array->NumberOfSlackDescriptors(), callbacks->length());
nof = AppendUniqueCallbacks<DescriptorArrayAppender>(callbacks, array, nof);
map->SetNumberOfOwnDescriptors(nof);
}
int AccessorInfo::AppendUnique(Handle<Object> descriptors,
Handle<FixedArray> array,
int valid_descriptors) {
Handle<TemplateList> callbacks = Handle<TemplateList>::cast(descriptors);
DCHECK_GE(array->length(), callbacks->length() + valid_descriptors);
return AppendUniqueCallbacks<FixedArrayAppender>(callbacks, array,
valid_descriptors);
}
static bool ContainsMap(MapHandleList* maps, Map* map) {
DCHECK_NOT_NULL(map);
for (int i = 0; i < maps->length(); ++i) {
if (!maps->at(i).is_null() && *maps->at(i) == map) return true;
}
return false;
}
Map* Map::FindElementsKindTransitionedMap(MapHandleList* candidates) {
DisallowHeapAllocation no_allocation;
DisallowDeoptimization no_deoptimization(GetIsolate());
ElementsKind kind = elements_kind();
bool packed = IsFastPackedElementsKind(kind);
Map* transition = nullptr;
if (IsTransitionableFastElementsKind(kind)) {
// Check the state of the root map.
Map* root_map = FindRootMap();
if (!EquivalentToForTransition(root_map)) return nullptr;
root_map = root_map->LookupElementsTransitionMap(kind);
DCHECK_NOT_NULL(root_map);
// Starting from the next existing elements kind transition try to
// replay the property transitions that does not involve instance rewriting
// (ElementsTransitionAndStoreStub does not support that).
for (root_map = root_map->ElementsTransitionMap();
root_map != nullptr && root_map->has_fast_elements();
root_map = root_map->ElementsTransitionMap()) {
Map* current = root_map->TryReplayPropertyTransitions(this);
if (current == nullptr) continue;
if (InstancesNeedRewriting(current)) continue;
if (ContainsMap(candidates, current) &&
(packed || !IsFastPackedElementsKind(current->elements_kind()))) {
transition = current;
packed = packed && IsFastPackedElementsKind(current->elements_kind());
}
}
}
return transition;
}
static Map* FindClosestElementsTransition(Map* map, ElementsKind to_kind) {
// Ensure we are requested to search elements kind transition "near the root".
DCHECK_EQ(map->FindRootMap()->NumberOfOwnDescriptors(),
map->NumberOfOwnDescriptors());
Map* current_map = map;
ElementsKind kind = map->elements_kind();
while (kind != to_kind) {
Map* next_map = current_map->ElementsTransitionMap();
if (next_map == nullptr) return current_map;
kind = next_map->elements_kind();
current_map = next_map;
}
DCHECK_EQ(to_kind, current_map->elements_kind());
return current_map;
}
Map* Map::LookupElementsTransitionMap(ElementsKind to_kind) {
Map* to_map = FindClosestElementsTransition(this, to_kind);
if (to_map->elements_kind() == to_kind) return to_map;
return nullptr;
}
bool Map::IsMapInArrayPrototypeChain() {
Isolate* isolate = GetIsolate();
if (isolate->initial_array_prototype()->map() == this) {
return true;
}
if (isolate->initial_object_prototype()->map() == this) {
return true;
}
return false;
}
Handle<WeakCell> Map::WeakCellForMap(Handle<Map> map) {
Isolate* isolate = map->GetIsolate();
if (map->weak_cell_cache()->IsWeakCell()) {
return Handle<WeakCell>(WeakCell::cast(map->weak_cell_cache()));
}
Handle<WeakCell> weak_cell = isolate->factory()->NewWeakCell(map);
map->set_weak_cell_cache(*weak_cell);
return weak_cell;
}
static Handle<Map> AddMissingElementsTransitions(Handle<Map> map,
ElementsKind to_kind) {
DCHECK(IsTransitionElementsKind(map->elements_kind()));
Handle<Map> current_map = map;
ElementsKind kind = map->elements_kind();
TransitionFlag flag;
if (map->is_prototype_map()) {
flag = OMIT_TRANSITION;
} else {
flag = INSERT_TRANSITION;
if (IsFastElementsKind(kind)) {
while (kind != to_kind && !IsTerminalElementsKind(kind)) {
kind = GetNextTransitionElementsKind(kind);
current_map = Map::CopyAsElementsKind(current_map, kind, flag);
}
}
}
// In case we are exiting the fast elements kind system, just add the map in
// the end.
if (kind != to_kind) {
current_map = Map::CopyAsElementsKind(current_map, to_kind, flag);
}
DCHECK(current_map->elements_kind() == to_kind);
return current_map;
}
Handle<Map> Map::TransitionElementsTo(Handle<Map> map,
ElementsKind to_kind) {
ElementsKind from_kind = map->elements_kind();
if (from_kind == to_kind) return map;
Isolate* isolate = map->GetIsolate();
Context* native_context = isolate->context()->native_context();
if (from_kind == FAST_SLOPPY_ARGUMENTS_ELEMENTS) {
if (*map == native_context->fast_aliased_arguments_map()) {
DCHECK_EQ(SLOW_SLOPPY_ARGUMENTS_ELEMENTS, to_kind);
return handle(native_context->slow_aliased_arguments_map());
}
} else if (from_kind == SLOW_SLOPPY_ARGUMENTS_ELEMENTS) {
if (*map == native_context->slow_aliased_arguments_map()) {
DCHECK_EQ(FAST_SLOPPY_ARGUMENTS_ELEMENTS, to_kind);
return handle(native_context->fast_aliased_arguments_map());
}
} else if (IsFastElementsKind(from_kind) && IsFastElementsKind(to_kind)) {
// Reuse map transitions for JSArrays.
DisallowHeapAllocation no_gc;
if (native_context->get(Context::ArrayMapIndex(from_kind)) == *map) {
Object* maybe_transitioned_map =
native_context->get(Context::ArrayMapIndex(to_kind));
if (maybe_transitioned_map->IsMap()) {
return handle(Map::cast(maybe_transitioned_map), isolate);
}
}
}
DCHECK(!map->IsUndefined(isolate));
// Check if we can go back in the elements kind transition chain.
if (IsHoleyElementsKind(from_kind) &&
to_kind == GetPackedElementsKind(from_kind) &&
map->GetBackPointer()->IsMap() &&
Map::cast(map->GetBackPointer())->elements_kind() == to_kind) {
return handle(Map::cast(map->GetBackPointer()));
}
bool allow_store_transition = IsTransitionElementsKind(from_kind);
// Only store fast element maps in ascending generality.
if (IsFastElementsKind(to_kind)) {
allow_store_transition =
allow_store_transition && IsTransitionableFastElementsKind(from_kind) &&
IsMoreGeneralElementsKindTransition(from_kind, to_kind);
}
if (!allow_store_transition) {
return Map::CopyAsElementsKind(map, to_kind, OMIT_TRANSITION);
}
return Map::ReconfigureElementsKind(map, to_kind);
}
// static
Handle<Map> Map::AsElementsKind(Handle<Map> map, ElementsKind kind) {
Handle<Map> closest_map(FindClosestElementsTransition(*map, kind));
if (closest_map->elements_kind() == kind) {
return closest_map;
}
return AddMissingElementsTransitions(closest_map, kind);
}
Handle<Map> JSObject::GetElementsTransitionMap(Handle<JSObject> object,
ElementsKind to_kind) {
Handle<Map> map(object->map());
return Map::TransitionElementsTo(map, to_kind);
}
void JSProxy::Revoke(Handle<JSProxy> proxy) {
Isolate* isolate = proxy->GetIsolate();
if (!proxy->IsRevoked()) proxy->set_handler(isolate->heap()->null_value());
DCHECK(proxy->IsRevoked());
}
Maybe<bool> JSProxy::HasProperty(Isolate* isolate, Handle<JSProxy> proxy,
Handle<Name> name) {
DCHECK(!name->IsPrivate());
STACK_CHECK(isolate, Nothing<bool>());
// 1. (Assert)
// 2. Let handler be the value of the [[ProxyHandler]] internal slot of O.
Handle<Object> handler(proxy->handler(), isolate);
// 3. If handler is null, throw a TypeError exception.
// 4. Assert: Type(handler) is Object.
if (proxy->IsRevoked()) {
isolate->Throw(*isolate->factory()->NewTypeError(
MessageTemplate::kProxyRevoked, isolate->factory()->has_string()));
return Nothing<bool>();
}
// 5. Let target be the value of the [[ProxyTarget]] internal slot of O.
Handle<JSReceiver> target(proxy->target(), isolate);
// 6. Let trap be ? GetMethod(handler, "has").
Handle<Object> trap;
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
isolate, trap, Object::GetMethod(Handle<JSReceiver>::cast(handler),
isolate->factory()->has_string()),
Nothing<bool>());
// 7. If trap is undefined, then
if (trap->IsUndefined(isolate)) {
// 7a. Return target.[[HasProperty]](P).
return JSReceiver::HasProperty(target, name);
}
// 8. Let booleanTrapResult be ToBoolean(? Call(trap, handler, «target, P»)).
Handle<Object> trap_result_obj;
Handle<Object> args[] = {target, name};
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
isolate, trap_result_obj,
Execution::Call(isolate, trap, handler, arraysize(args), args),
Nothing<bool>());
bool boolean_trap_result = trap_result_obj->BooleanValue();
// 9. If booleanTrapResult is false, then:
if (!boolean_trap_result) {
// 9a. Let targetDesc be ? target.[[GetOwnProperty]](P).
PropertyDescriptor target_desc;
Maybe<bool> target_found = JSReceiver::GetOwnPropertyDescriptor(
isolate, target, name, &target_desc);
MAYBE_RETURN(target_found, Nothing<bool>());
// 9b. If targetDesc is not undefined, then:
if (target_found.FromJust()) {
// 9b i. If targetDesc.[[Configurable]] is false, throw a TypeError
// exception.
if (!target_desc.configurable()) {
isolate->Throw(*isolate->factory()->NewTypeError(
MessageTemplate::kProxyHasNonConfigurable, name));
return Nothing<bool>();
}
// 9b ii. Let extensibleTarget be ? IsExtensible(target).
Maybe<bool> extensible_target = JSReceiver::IsExtensible(target);
MAYBE_RETURN(extensible_target, Nothing<bool>());
// 9b iii. If extensibleTarget is false, throw a TypeError exception.
if (!extensible_target.FromJust()) {
isolate->Throw(*isolate->factory()->NewTypeError(
MessageTemplate::kProxyHasNonExtensible, name));
return Nothing<bool>();
}
}
}
// 10. Return booleanTrapResult.
return Just(boolean_trap_result);
}
Maybe<bool> JSProxy::SetProperty(Handle<JSProxy> proxy, Handle<Name> name,
Handle<Object> value, Handle<Object> receiver,
LanguageMode language_mode) {
DCHECK(!name->IsPrivate());
Isolate* isolate = proxy->GetIsolate();
STACK_CHECK(isolate, Nothing<bool>());
Factory* factory = isolate->factory();
Handle<String> trap_name = factory->set_string();
ShouldThrow should_throw =
is_sloppy(language_mode) ? DONT_THROW : THROW_ON_ERROR;
if (proxy->IsRevoked()) {
isolate->Throw(
*factory->NewTypeError(MessageTemplate::kProxyRevoked, trap_name));
return Nothing<bool>();
}
Handle<JSReceiver> target(proxy->target(), isolate);
Handle<JSReceiver> handler(JSReceiver::cast(proxy->handler()), isolate);
Handle<Object> trap;
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
isolate, trap, Object::GetMethod(handler, trap_name), Nothing<bool>());
if (trap->IsUndefined(isolate)) {
LookupIterator it =
LookupIterator::PropertyOrElement(isolate, receiver, name, target);
return Object::SetSuperProperty(&it, value, language_mode,
Object::MAY_BE_STORE_FROM_KEYED);
}
Handle<Object> trap_result;
Handle<Object> args[] = {target, name, value, receiver};
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
isolate, trap_result,
Execution::Call(isolate, trap, handler, arraysize(args), args),
Nothing<bool>());
if (!trap_result->BooleanValue()) {
RETURN_FAILURE(isolate, should_throw,
NewTypeError(MessageTemplate::kProxyTrapReturnedFalsishFor,
trap_name, name));
}
// Enforce the invariant.
PropertyDescriptor target_desc;
Maybe<bool> owned =
JSReceiver::GetOwnPropertyDescriptor(isolate, target, name, &target_desc);
MAYBE_RETURN(owned, Nothing<bool>());
if (owned.FromJust()) {
bool inconsistent = PropertyDescriptor::IsDataDescriptor(&target_desc) &&
!target_desc.configurable() &&
!target_desc.writable() &&
!value->SameValue(*target_desc.value());
if (inconsistent) {
isolate->Throw(*isolate->factory()->NewTypeError(
MessageTemplate::kProxySetFrozenData, name));
return Nothing<bool>();
}
inconsistent = PropertyDescriptor::IsAccessorDescriptor(&target_desc) &&
!target_desc.configurable() &&
target_desc.set()->IsUndefined(isolate);
if (inconsistent) {
isolate->Throw(*isolate->factory()->NewTypeError(
MessageTemplate::kProxySetFrozenAccessor, name));
return Nothing<bool>();
}
}
return Just(true);
}
Maybe<bool> JSProxy::DeletePropertyOrElement(Handle<JSProxy> proxy,
Handle<Name> name,
LanguageMode language_mode) {
DCHECK(!name->IsPrivate());
ShouldThrow should_throw =
is_sloppy(language_mode) ? DONT_THROW : THROW_ON_ERROR;
Isolate* isolate = proxy->GetIsolate();
STACK_CHECK(isolate, Nothing<bool>());
Factory* factory = isolate->factory();
Handle<String> trap_name = factory->deleteProperty_string();
if (proxy->IsRevoked()) {
isolate->Throw(
*factory->NewTypeError(MessageTemplate::kProxyRevoked, trap_name));
return Nothing<bool>();
}
Handle<JSReceiver> target(proxy->target(), isolate);
Handle<JSReceiver> handler(JSReceiver::cast(proxy->handler()), isolate);
Handle<Object> trap;
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
isolate, trap, Object::GetMethod(handler, trap_name), Nothing<bool>());
if (trap->IsUndefined(isolate)) {
return JSReceiver::DeletePropertyOrElement(target, name, language_mode);
}
Handle<Object> trap_result;
Handle<Object> args[] = {target, name};
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
isolate, trap_result,
Execution::Call(isolate, trap, handler, arraysize(args), args),
Nothing<bool>());
if (!trap_result->BooleanValue()) {
RETURN_FAILURE(isolate, should_throw,
NewTypeError(MessageTemplate::kProxyTrapReturnedFalsishFor,
trap_name, name));
}
// Enforce the invariant.
PropertyDescriptor target_desc;
Maybe<bool> owned =
JSReceiver::GetOwnPropertyDescriptor(isolate, target, name, &target_desc);
MAYBE_RETURN(owned, Nothing<bool>());
if (owned.FromJust() && !target_desc.configurable()) {
isolate->Throw(*factory->NewTypeError(
MessageTemplate::kProxyDeletePropertyNonConfigurable, name));
return Nothing<bool>();
}
return Just(true);
}
// static
MaybeHandle<JSProxy> JSProxy::New(Isolate* isolate, Handle<Object> target,
Handle<Object> handler) {
if (!target->IsJSReceiver()) {
THROW_NEW_ERROR(isolate, NewTypeError(MessageTemplate::kProxyNonObject),
JSProxy);
}
if (target->IsJSProxy() && JSProxy::cast(*target)->IsRevoked()) {
THROW_NEW_ERROR(isolate,
NewTypeError(MessageTemplate::kProxyHandlerOrTargetRevoked),
JSProxy);
}
if (!handler->IsJSReceiver()) {
THROW_NEW_ERROR(isolate, NewTypeError(MessageTemplate::kProxyNonObject),
JSProxy);
}
if (handler->IsJSProxy() && JSProxy::cast(*handler)->IsRevoked()) {
THROW_NEW_ERROR(isolate,
NewTypeError(MessageTemplate::kProxyHandlerOrTargetRevoked),
JSProxy);
}
return isolate->factory()->NewJSProxy(Handle<JSReceiver>::cast(target),
Handle<JSReceiver>::cast(handler));
}
// static
MaybeHandle<Context> JSProxy::GetFunctionRealm(Handle<JSProxy> proxy) {
DCHECK(proxy->map()->is_constructor());
if (proxy->IsRevoked()) {
THROW_NEW_ERROR(proxy->GetIsolate(),
NewTypeError(MessageTemplate::kProxyRevoked), Context);
}
Handle<JSReceiver> target(JSReceiver::cast(proxy->target()));
return JSReceiver::GetFunctionRealm(target);
}
// static
MaybeHandle<Context> JSBoundFunction::GetFunctionRealm(
Handle<JSBoundFunction> function) {
DCHECK(function->map()->is_constructor());
return JSReceiver::GetFunctionRealm(
handle(function->bound_target_function()));
}
// static
MaybeHandle<String> JSBoundFunction::GetName(Isolate* isolate,
Handle<JSBoundFunction> function) {
Handle<String> prefix = isolate->factory()->bound__string();
if (!function->bound_target_function()->IsJSFunction()) return prefix;
Handle<JSFunction> target(JSFunction::cast(function->bound_target_function()),
isolate);
Handle<Object> target_name = JSFunction::GetName(isolate, target);
if (!target_name->IsString()) return prefix;
Factory* factory = isolate->factory();
return factory->NewConsString(prefix, Handle<String>::cast(target_name));
}
// static
Handle<Object> JSFunction::GetName(Isolate* isolate,
Handle<JSFunction> function) {
if (function->shared()->name_should_print_as_anonymous()) {
return isolate->factory()->anonymous_string();
}
return handle(function->shared()->name(), isolate);
}
// static
MaybeHandle<Smi> JSFunction::GetLength(Isolate* isolate,
Handle<JSFunction> function) {
int length = 0;
if (function->shared()->is_compiled()) {
length = function->shared()->length();
} else {
// If the function isn't compiled yet, the length is not computed
// correctly yet. Compile it now and return the right length.
if (Compiler::Compile(function, Compiler::KEEP_EXCEPTION)) {
length = function->shared()->length();
}
if (isolate->has_pending_exception()) return MaybeHandle<Smi>();
}
return handle(Smi::FromInt(length), isolate);
}
// static
Handle<Context> JSFunction::GetFunctionRealm(Handle<JSFunction> function) {
DCHECK(function->map()->is_constructor());
return handle(function->context()->native_context());
}
// static
MaybeHandle<Context> JSObject::GetFunctionRealm(Handle<JSObject> object) {
DCHECK(object->map()->is_constructor());
DCHECK(!object->IsJSFunction());
return object->GetCreationContext();
}
// static
MaybeHandle<Context> JSReceiver::GetFunctionRealm(Handle<JSReceiver> receiver) {
if (receiver->IsJSProxy()) {
return JSProxy::GetFunctionRealm(Handle<JSProxy>::cast(receiver));
}
if (receiver->IsJSFunction()) {
return JSFunction::GetFunctionRealm(Handle<JSFunction>::cast(receiver));
}
if (receiver->IsJSBoundFunction()) {
return JSBoundFunction::GetFunctionRealm(
Handle<JSBoundFunction>::cast(receiver));
}
return JSObject::GetFunctionRealm(Handle<JSObject>::cast(receiver));
}
Maybe<PropertyAttributes> JSProxy::GetPropertyAttributes(LookupIterator* it) {
PropertyDescriptor desc;
Maybe<bool> found = JSProxy::GetOwnPropertyDescriptor(
it->isolate(), it->GetHolder<JSProxy>(), it->GetName(), &desc);
MAYBE_RETURN(found, Nothing<PropertyAttributes>());
if (!found.FromJust()) return Just(ABSENT);
return Just(desc.ToAttributes());
}
void JSObject::AllocateStorageForMap(Handle<JSObject> object, Handle<Map> map) {
DCHECK(object->map()->GetInObjectProperties() ==
map->GetInObjectProperties());
ElementsKind obj_kind = object->map()->elements_kind();
ElementsKind map_kind = map->elements_kind();
if (map_kind != obj_kind) {
ElementsKind to_kind = GetMoreGeneralElementsKind(map_kind, obj_kind);
if (IsDictionaryElementsKind(obj_kind)) {
to_kind = obj_kind;
}
if (IsDictionaryElementsKind(to_kind)) {
NormalizeElements(object);
} else {
TransitionElementsKind(object, to_kind);
}
map = Map::ReconfigureElementsKind(map, to_kind);
}
JSObject::MigrateToMap(object, map);
}
void JSObject::MigrateInstance(Handle<JSObject> object) {
Handle<Map> original_map(object->map());
Handle<Map> map = Map::Update(original_map);
map->set_migration_target(true);
MigrateToMap(object, map);
if (FLAG_trace_migration) {
object->PrintInstanceMigration(stdout, *original_map, *map);
}
#if VERIFY_HEAP
if (FLAG_verify_heap) {
object->JSObjectVerify();
}
#endif
}
// static
bool JSObject::TryMigrateInstance(Handle<JSObject> object) {
Isolate* isolate = object->GetIsolate();
DisallowDeoptimization no_deoptimization(isolate);
Handle<Map> original_map(object->map(), isolate);
Handle<Map> new_map;
if (!Map::TryUpdate(original_map).ToHandle(&new_map)) {
return false;
}
JSObject::MigrateToMap(object, new_map);
if (FLAG_trace_migration) {
object->PrintInstanceMigration(stdout, *original_map, object->map());
}
#if VERIFY_HEAP
if (FLAG_verify_heap) {
object->JSObjectVerify();
}
#endif
return true;
}
void JSObject::AddProperty(Handle<JSObject> object, Handle<Name> name,
Handle<Object> value,
PropertyAttributes attributes) {
LookupIterator it(object, name, object, LookupIterator::OWN_SKIP_INTERCEPTOR);
CHECK_NE(LookupIterator::ACCESS_CHECK, it.state());
#ifdef DEBUG
uint32_t index;
DCHECK(!object->IsJSProxy());
DCHECK(!name->AsArrayIndex(&index));
Maybe<PropertyAttributes> maybe = GetPropertyAttributes(&it);
DCHECK(maybe.IsJust());
DCHECK(!it.IsFound());
DCHECK(object->map()->is_extensible() || name->IsPrivate());
#endif
CHECK(AddDataProperty(&it, value, attributes, THROW_ON_ERROR,
CERTAINLY_NOT_STORE_FROM_KEYED)
.IsJust());
}
// Reconfigures a property to a data property with attributes, even if it is not
// reconfigurable.
// Requires a LookupIterator that does not look at the prototype chain beyond
// hidden prototypes.
MaybeHandle<Object> JSObject::DefineOwnPropertyIgnoreAttributes(
LookupIterator* it, Handle<Object> value, PropertyAttributes attributes,
AccessorInfoHandling handling) {
MAYBE_RETURN_NULL(DefineOwnPropertyIgnoreAttributes(
it, value, attributes, THROW_ON_ERROR, handling));
return value;
}
Maybe<bool> JSObject::DefineOwnPropertyIgnoreAttributes(
LookupIterator* it, Handle<Object> value, PropertyAttributes attributes,
ShouldThrow should_throw, AccessorInfoHandling handling) {
it->UpdateProtector();
Handle<JSObject> object = Handle<JSObject>::cast(it->GetReceiver());
for (; it->IsFound(); it->Next()) {
switch (it->state()) {
case LookupIterator::JSPROXY:
case LookupIterator::NOT_FOUND:
case LookupIterator::TRANSITION:
UNREACHABLE();
case LookupIterator::ACCESS_CHECK:
if (!it->HasAccess()) {
it->isolate()->ReportFailedAccessCheck(it->GetHolder<JSObject>());
RETURN_VALUE_IF_SCHEDULED_EXCEPTION(it->isolate(), Nothing<bool>());
return Just(true);
}
break;
// If there's an interceptor, try to store the property with the
// interceptor.
// In case of success, the attributes will have been reset to the default
// attributes of the interceptor, rather than the incoming attributes.
//
// TODO(verwaest): JSProxy afterwards verify the attributes that the
// JSProxy claims it has, and verifies that they are compatible. If not,
// they throw. Here we should do the same.
case LookupIterator::INTERCEPTOR:
if (handling == DONT_FORCE_FIELD) {
Maybe<bool> result =
JSObject::SetPropertyWithInterceptor(it, should_throw, value);
if (result.IsNothing() || result.FromJust()) return result;
}
break;
case LookupIterator::ACCESSOR: {
Handle<Object> accessors = it->GetAccessors();
// Special handling for AccessorInfo, which behaves like a data
// property.
if (accessors->IsAccessorInfo() && handling == DONT_FORCE_FIELD) {
PropertyAttributes current_attributes = it->property_attributes();
// Ensure the context isn't changed after calling into accessors.
AssertNoContextChange ncc(it->isolate());
// Update the attributes before calling the setter. The setter may
// later change the shape of the property.
if (current_attributes != attributes) {
it->TransitionToAccessorPair(accessors, attributes);
}
return JSObject::SetPropertyWithAccessor(it, value, should_throw);
}
it->ReconfigureDataProperty(value, attributes);
return Just(true);
}
case LookupIterator::INTEGER_INDEXED_EXOTIC:
return RedefineIncompatibleProperty(it->isolate(), it->GetName(), value,
should_throw);
case LookupIterator::DATA: {
// Regular property update if the attributes match.
if (it->property_attributes() == attributes) {
return SetDataProperty(it, value);
}
// Special case: properties of typed arrays cannot be reconfigured to
// non-writable nor to non-enumerable.
if (it->IsElement() && object->HasFixedTypedArrayElements()) {
return RedefineIncompatibleProperty(it->isolate(), it->GetName(),
value, should_throw);
}
// Reconfigure the data property if the attributes mismatch.
it->ReconfigureDataProperty(value, attributes);
return Just(true);
}
}
}
return AddDataProperty(it, value, attributes, should_throw,
CERTAINLY_NOT_STORE_FROM_KEYED);
}
MaybeHandle<Object> JSObject::SetOwnPropertyIgnoreAttributes(
Handle<JSObject> object, Handle<Name> name, Handle<Object> value,
PropertyAttributes attributes) {
DCHECK(!value->IsTheHole(object->GetIsolate()));
LookupIterator it(object, name, object, LookupIterator::OWN);
return DefineOwnPropertyIgnoreAttributes(&it, value, attributes);
}
MaybeHandle<Object> JSObject::SetOwnElementIgnoreAttributes(
Handle<JSObject> object, uint32_t index, Handle<Object> value,
PropertyAttributes attributes) {
Isolate* isolate = object->GetIsolate();
LookupIterator it(isolate, object, index, object, LookupIterator::OWN);
return DefineOwnPropertyIgnoreAttributes(&it, value, attributes);
}
MaybeHandle<Object> JSObject::DefinePropertyOrElementIgnoreAttributes(
Handle<JSObject> object, Handle<Name> name, Handle<Object> value,
PropertyAttributes attributes) {
Isolate* isolate = object->GetIsolate();
LookupIterator it = LookupIterator::PropertyOrElement(
isolate, object, name, object, LookupIterator::OWN);
return DefineOwnPropertyIgnoreAttributes(&it, value, attributes);
}
Maybe<PropertyAttributes> JSObject::GetPropertyAttributesWithInterceptor(
LookupIterator* it) {
return GetPropertyAttributesWithInterceptorInternal(it, it->GetInterceptor());
}
Maybe<PropertyAttributes> JSReceiver::GetPropertyAttributes(
LookupIterator* it) {
for (; it->IsFound(); it->Next()) {
switch (it->state()) {
case LookupIterator::NOT_FOUND:
case LookupIterator::TRANSITION:
UNREACHABLE();
case LookupIterator::JSPROXY:
return JSProxy::GetPropertyAttributes(it);
case LookupIterator::INTERCEPTOR: {
Maybe<PropertyAttributes> result =
JSObject::GetPropertyAttributesWithInterceptor(it);
if (!result.IsJust()) return result;
if (result.FromJust() != ABSENT) return result;
break;
}
case LookupIterator::ACCESS_CHECK:
if (it->HasAccess()) break;
return JSObject::GetPropertyAttributesWithFailedAccessCheck(it);
case LookupIterator::INTEGER_INDEXED_EXOTIC:
return Just(ABSENT);
case LookupIterator::ACCESSOR:
case LookupIterator::DATA:
return Just(it->property_attributes());
}
}
return Just(ABSENT);
}
Handle<NormalizedMapCache> NormalizedMapCache::New(Isolate* isolate) {
Handle<FixedArray> array(
isolate->factory()->NewFixedArray(kEntries, TENURED));
return Handle<NormalizedMapCache>::cast(array);
}
MaybeHandle<Map> NormalizedMapCache::Get(Handle<Map> fast_map,
PropertyNormalizationMode mode) {
DisallowHeapAllocation no_gc;
Object* value = FixedArray::get(GetIndex(fast_map));
if (!value->IsMap() ||
!Map::cast(value)->EquivalentToForNormalization(*fast_map, mode)) {
return MaybeHandle<Map>();
}
return handle(Map::cast(value));
}
void NormalizedMapCache::Set(Handle<Map> fast_map,
Handle<Map> normalized_map) {
DisallowHeapAllocation no_gc;
DCHECK(normalized_map->is_dictionary_map());
FixedArray::set(GetIndex(fast_map), *normalized_map);
}
void NormalizedMapCache::Clear() {
int entries = length();
for (int i = 0; i != entries; i++) {
set_undefined(i);
}
}
void HeapObject::UpdateMapCodeCache(Handle<HeapObject> object,
Handle<Name> name,
Handle<Code> code) {
Handle<Map> map(object->map());
Map::UpdateCodeCache(map, name, code);
}
void JSObject::NormalizeProperties(Handle<JSObject> object,
PropertyNormalizationMode mode,
int expected_additional_properties,
const char* reason) {
if (!object->HasFastProperties()) return;
Handle<Map> map(object->map());
Handle<Map> new_map = Map::Normalize(map, mode, reason);
MigrateToMap(object, new_map, expected_additional_properties);
}
void JSObject::MigrateSlowToFast(Handle<JSObject> object,
int unused_property_fields,
const char* reason) {
if (object->HasFastProperties()) return;
DCHECK(!object->IsJSGlobalObject());
Isolate* isolate = object->GetIsolate();
Factory* factory = isolate->factory();
Handle<NameDictionary> dictionary(object->property_dictionary());
// Make sure we preserve dictionary representation if there are too many
// descriptors.
int number_of_elements = dictionary->NumberOfElements();
if (number_of_elements > kMaxNumberOfDescriptors) return;
Handle<FixedArray> iteration_order;
if (number_of_elements != dictionary->NextEnumerationIndex()) {
iteration_order =
NameDictionary::DoGenerateNewEnumerationIndices(dictionary);
} else {
iteration_order = NameDictionary::IterationIndices(dictionary);
}
int instance_descriptor_length = iteration_order->length();
int number_of_fields = 0;
// Compute the length of the instance descriptor.
for (int i = 0; i < instance_descriptor_length; i++) {
int index = Smi::cast(iteration_order->get(i))->value();
DCHECK(dictionary->IsKey(isolate, dictionary->KeyAt(index)));
PropertyKind kind = dictionary->DetailsAt(index).kind();
if (kind == kData) {
if (FLAG_track_constant_fields) {
number_of_fields += 1;
} else {
Object* value = dictionary->ValueAt(index);
if (!value->IsJSFunction()) {
number_of_fields += 1;
}
}
}
}
Handle<Map> old_map(object->map(), isolate);
int inobject_props = old_map->GetInObjectProperties();
// Allocate new map.
Handle<Map> new_map = Map::CopyDropDescriptors(old_map);
new_map->set_dictionary_map(false);
NotifyMapChange(old_map, new_map, isolate);
#if TRACE_MAPS
if (FLAG_trace_maps) {
PrintF("[TraceMaps: SlowToFast from= %p to= %p reason= %s ]\n",
reinterpret_cast<void*>(*old_map), reinterpret_cast<void*>(*new_map),
reason);
}
#endif
if (instance_descriptor_length == 0) {
DisallowHeapAllocation no_gc;
DCHECK_LE(unused_property_fields, inobject_props);
// Transform the object.
new_map->set_unused_property_fields(inobject_props);
object->synchronized_set_map(*new_map);
object->set_properties(isolate->heap()->empty_fixed_array());
// Check that it really works.
DCHECK(object->HasFastProperties());
return;
}
// Allocate the instance descriptor.
Handle<DescriptorArray> descriptors = DescriptorArray::Allocate(
isolate, instance_descriptor_length, 0, TENURED);
int number_of_allocated_fields =
number_of_fields + unused_property_fields - inobject_props;
if (number_of_allocated_fields < 0) {
// There is enough inobject space for all fields (including unused).
number_of_allocated_fields = 0;
unused_property_fields = inobject_props - number_of_fields;
}
// Allocate the fixed array for the fields.
Handle<FixedArray> fields = factory->NewFixedArray(
number_of_allocated_fields);
// Fill in the instance descriptor and the fields.
int current_offset = 0;
for (int i = 0; i < instance_descriptor_length; i++) {
int index = Smi::cast(iteration_order->get(i))->value();
Object* k = dictionary->KeyAt(index);
DCHECK(dictionary->IsKey(k));
// Dictionary keys are internalized upon insertion.
// TODO(jkummerow): Turn this into a DCHECK if it's not hit in the wild.
CHECK(k->IsUniqueName());
Handle<Name> key(Name::cast(k), isolate);
Object* value = dictionary->ValueAt(index);
PropertyDetails details = dictionary->DetailsAt(index);
DCHECK_EQ(kField, details.location());
DCHECK_EQ(kMutable, details.constness());
int enumeration_index = details.dictionary_index();
Descriptor d;
if (details.kind() == kData) {
if (!FLAG_track_constant_fields && value->IsJSFunction()) {
d = Descriptor::DataConstant(key, handle(value, isolate),
details.attributes());
} else {
d = Descriptor::DataField(
key, current_offset, details.attributes(), kDefaultFieldConstness,
// TODO(verwaest): value->OptimalRepresentation();
Representation::Tagged(), FieldType::Any(isolate));
}
} else {
DCHECK_EQ(kAccessor, details.kind());
d = Descriptor::AccessorConstant(key, handle(value, isolate),
details.attributes());
}
details = d.GetDetails();
if (details.location() == kField) {
if (current_offset < inobject_props) {
object->InObjectPropertyAtPut(current_offset, value,
UPDATE_WRITE_BARRIER);
} else {
int offset = current_offset - inobject_props;
fields->set(offset, value);
}
current_offset += details.field_width_in_words();
}
descriptors->Set(enumeration_index - 1, &d);
}
DCHECK(current_offset == number_of_fields);
descriptors->Sort();
Handle<LayoutDescriptor> layout_descriptor = LayoutDescriptor::New(
new_map, descriptors, descriptors->number_of_descriptors());
DisallowHeapAllocation no_gc;
new_map->InitializeDescriptors(*descriptors, *layout_descriptor);
new_map->set_unused_property_fields(unused_property_fields);
// Transform the object.
object->synchronized_set_map(*new_map);
object->set_properties(*fields);
DCHECK(object->IsJSObject());
// Check that it really works.
DCHECK(object->HasFastProperties());
}
void JSObject::ResetElements(Handle<JSObject> object) {
Isolate* isolate = object->GetIsolate();
CHECK(object->map() != isolate->heap()->sloppy_arguments_elements_map());
if (object->map()->has_dictionary_elements()) {
Handle<SeededNumberDictionary> new_elements =
SeededNumberDictionary::New(isolate, 0);
object->set_elements(*new_elements);
} else {
object->set_elements(object->map()->GetInitialElements());
}
}
void JSObject::RequireSlowElements(SeededNumberDictionary* dictionary) {
if (dictionary->requires_slow_elements()) return;
dictionary->set_requires_slow_elements();
if (map()->is_prototype_map()) {
// If this object is a prototype (the callee will check), invalidate any
// prototype chains involving it.
InvalidatePrototypeChains(map());
}
}
Handle<SeededNumberDictionary> JSObject::NormalizeElements(
Handle<JSObject> object) {
DCHECK(!object->HasFixedTypedArrayElements());
Isolate* isolate = object->GetIsolate();
bool is_arguments = object->HasSloppyArgumentsElements();
{
DisallowHeapAllocation no_gc;
FixedArrayBase* elements = object->elements();
if (is_arguments) {
FixedArray* parameter_map = FixedArray::cast(elements);
elements = FixedArrayBase::cast(parameter_map->get(1));
}
if (elements->IsDictionary()) {
return handle(SeededNumberDictionary::cast(elements), isolate);
}
}
DCHECK(object->HasFastSmiOrObjectElements() ||
object->HasFastDoubleElements() ||
object->HasFastArgumentsElements() ||
object->HasFastStringWrapperElements());
Handle<SeededNumberDictionary> dictionary =
object->GetElementsAccessor()->Normalize(object);
// Switch to using the dictionary as the backing storage for elements.
ElementsKind target_kind = is_arguments
? SLOW_SLOPPY_ARGUMENTS_ELEMENTS
: object->HasFastStringWrapperElements()
? SLOW_STRING_WRAPPER_ELEMENTS
: DICTIONARY_ELEMENTS;
Handle<Map> new_map = JSObject::GetElementsTransitionMap(object, target_kind);
// Set the new map first to satify the elements type assert in set_elements().
JSObject::MigrateToMap(object, new_map);
if (is_arguments) {
FixedArray::cast(object->elements())->set(1, *dictionary);
} else {
object->set_elements(*dictionary);
}
isolate->counters()->elements_to_dictionary()->Increment();
#ifdef DEBUG
if (FLAG_trace_normalization) {
OFStream os(stdout);
os << "Object elements have been normalized:\n";
object->Print(os);
}
#endif
DCHECK(object->HasDictionaryElements() ||
object->HasSlowArgumentsElements() ||
object->HasSlowStringWrapperElements());
return dictionary;
}
template <typename ProxyType>
static Smi* GetOrCreateIdentityHashHelper(Isolate* isolate,
Handle<ProxyType> proxy) {
Object* maybe_hash = proxy->hash();
if (maybe_hash->IsSmi()) return Smi::cast(maybe_hash);
Smi* hash = Smi::FromInt(isolate->GenerateIdentityHash(Smi::kMaxValue));
proxy->set_hash(hash);
return hash;
}
// static
Object* JSObject::GetIdentityHash(Isolate* isolate, Handle<JSObject> object) {
if (object->IsJSGlobalProxy()) {
return JSGlobalProxy::cast(*object)->hash();
}
Handle<Name> hash_code_symbol = isolate->factory()->hash_code_symbol();
return *JSReceiver::GetDataProperty(object, hash_code_symbol);
}
// static
Smi* JSObject::GetOrCreateIdentityHash(Isolate* isolate,
Handle<JSObject> object) {
if (object->IsJSGlobalProxy()) {
return GetOrCreateIdentityHashHelper(isolate,
Handle<JSGlobalProxy>::cast(object));
}
Handle<Name> hash_code_symbol = isolate->factory()->hash_code_symbol();
LookupIterator it(object, hash_code_symbol, object, LookupIterator::OWN);
if (it.IsFound()) {
DCHECK_EQ(LookupIterator::DATA, it.state());
Object* maybe_hash = *it.GetDataValue();
if (maybe_hash->IsSmi()) return Smi::cast(maybe_hash);
}
Smi* hash = Smi::FromInt(isolate->GenerateIdentityHash(Smi::kMaxValue));
CHECK(AddDataProperty(&it, handle(hash, isolate), NONE, THROW_ON_ERROR,
CERTAINLY_NOT_STORE_FROM_KEYED)
.IsJust());
return hash;
}
// static
Object* JSProxy::GetIdentityHash(Handle<JSProxy> proxy) {
return proxy->hash();
}
Smi* JSProxy::GetOrCreateIdentityHash(Isolate* isolate, Handle<JSProxy> proxy) {
return GetOrCreateIdentityHashHelper(isolate, proxy);
}
Maybe<bool> JSObject::DeletePropertyWithInterceptor(LookupIterator* it,
ShouldThrow should_throw) {
Isolate* isolate = it->isolate();
// Make sure that the top context does not change when doing callbacks or
// interceptor calls.
AssertNoContextChange ncc(isolate);
DCHECK_EQ(LookupIterator::INTERCEPTOR, it->state());
Handle<InterceptorInfo> interceptor(it->GetInterceptor());
if (interceptor->deleter()->IsUndefined(isolate)) return Nothing<bool>();
Handle<JSObject> holder = it->GetHolder<JSObject>();
Handle<Object> receiver = it->GetReceiver();
if (!receiver->IsJSReceiver()) {
ASSIGN_RETURN_ON_EXCEPTION_VALUE(isolate, receiver,
Object::ConvertReceiver(isolate, receiver),
Nothing<bool>());
}
PropertyCallbackArguments args(isolate, interceptor->data(), *receiver,
*holder, should_throw);
Handle<Object> result;
if (it->IsElement()) {
uint32_t index = it->index();
v8::IndexedPropertyDeleterCallback deleter =
v8::ToCData<v8::IndexedPropertyDeleterCallback>(interceptor->deleter());
result = args.Call(deleter, index);
} else if (it->name()->IsSymbol() && !interceptor->can_intercept_symbols()) {
return Nothing<bool>();
} else {
Handle<Name> name = it->name();
DCHECK(!name->IsPrivate());
v8::GenericNamedPropertyDeleterCallback deleter =
v8::ToCData<v8::GenericNamedPropertyDeleterCallback>(
interceptor->deleter());
result = args.Call(deleter, name);
}
RETURN_VALUE_IF_SCHEDULED_EXCEPTION(isolate, Nothing<bool>());
if (result.is_null()) return Nothing<bool>();
DCHECK(result->IsBoolean());
// Rebox CustomArguments::kReturnValueOffset before returning.
return Just(result->IsTrue(isolate));
}
void JSReceiver::DeleteNormalizedProperty(Handle<JSReceiver> object,
Handle<Name> name, int entry) {
DCHECK(!object->HasFastProperties());
Isolate* isolate = object->GetIsolate();
if (object->IsJSGlobalObject()) {
// If we have a global object, invalidate the cell and swap in a new one.
Handle<GlobalDictionary> dictionary(
JSObject::cast(*object)->global_dictionary());
DCHECK_NE(GlobalDictionary::kNotFound, entry);
auto cell = PropertyCell::InvalidateEntry(dictionary, entry);
cell->set_value(isolate->heap()->the_hole_value());
cell->set_property_details(
PropertyDetails::Empty(PropertyCellType::kUninitialized));
} else {
Handle<NameDictionary> dictionary(object->property_dictionary());
DCHECK_NE(NameDictionary::kNotFound, entry);
NameDictionary::DeleteProperty(dictionary, entry);
Handle<NameDictionary> new_properties =
NameDictionary::Shrink(dictionary, name);
object->set_properties(*new_properties);
}
}
Maybe<bool> JSReceiver::DeleteProperty(LookupIterator* it,
LanguageMode language_mode) {
it->UpdateProtector();
Isolate* isolate = it->isolate();
if (it->state() == LookupIterator::JSPROXY) {
return JSProxy::DeletePropertyOrElement(it->GetHolder<JSProxy>(),
it->GetName(), language_mode);
}
if (it->GetReceiver()->IsJSProxy()) {
if (it->state() != LookupIterator::NOT_FOUND) {
DCHECK_EQ(LookupIterator::DATA, it->state());
DCHECK(it->name()->IsPrivate());
it->Delete();
}
return Just(true);
}
Handle<JSObject> receiver = Handle<JSObject>::cast(it->GetReceiver());
for (; it->IsFound(); it->Next()) {
switch (it->state()) {
case LookupIterator::JSPROXY:
case LookupIterator::NOT_FOUND:
case LookupIterator::TRANSITION:
UNREACHABLE();
case LookupIterator::ACCESS_CHECK:
if (it->HasAccess()) break;
isolate->ReportFailedAccessCheck(it->GetHolder<JSObject>());
RETURN_VALUE_IF_SCHEDULED_EXCEPTION(isolate, Nothing<bool>());
return Just(false);
case LookupIterator::INTERCEPTOR: {
ShouldThrow should_throw =
is_sloppy(language_mode) ? DONT_THROW : THROW_ON_ERROR;
Maybe<bool> result =
JSObject::DeletePropertyWithInterceptor(it, should_throw);
// An exception was thrown in the interceptor. Propagate.
if (isolate->has_pending_exception()) return Nothing<bool>();
// Delete with interceptor succeeded. Return result.
// TODO(neis): In strict mode, we should probably throw if the
// interceptor returns false.
if (result.IsJust()) return result;
break;
}
case LookupIterator::INTEGER_INDEXED_EXOTIC:
return Just(true);
case LookupIterator::DATA:
case LookupIterator::ACCESSOR: {
if (!it->IsConfigurable()) {
// Fail if the property is not configurable.
if (is_strict(language_mode)) {
isolate->Throw(*isolate->factory()->NewTypeError(
MessageTemplate::kStrictDeleteProperty, it->GetName(),
receiver));
return Nothing<bool>();
}
return Just(false);
}
it->Delete();
return Just(true);
}
}
}
return Just(true);
}
Maybe<bool> JSReceiver::DeleteElement(Handle<JSReceiver> object, uint32_t index,
LanguageMode language_mode) {
LookupIterator it(object->GetIsolate(), object, index, object,
LookupIterator::OWN);
return DeleteProperty(&it, language_mode);
}
Maybe<bool> JSReceiver::DeleteProperty(Handle<JSReceiver> object,
Handle<Name> name,
LanguageMode language_mode) {
LookupIterator it(object, name, object, LookupIterator::OWN);
return DeleteProperty(&it, language_mode);
}
Maybe<bool> JSReceiver::DeletePropertyOrElement(Handle<JSReceiver> object,
Handle<Name> name,
LanguageMode language_mode) {
LookupIterator it = LookupIterator::PropertyOrElement(
name->GetIsolate(), object, name, object, LookupIterator::OWN);
return DeleteProperty(&it, language_mode);
}
// ES6 19.1.2.4
// static
Object* JSReceiver::DefineProperty(Isolate* isolate, Handle<Object> object,
Handle<Object> key,
Handle<Object> attributes) {
// 1. If Type(O) is not Object, throw a TypeError exception.
if (!object->IsJSReceiver()) {
Handle<String> fun_name =
isolate->factory()->InternalizeUtf8String("Object.defineProperty");
THROW_NEW_ERROR_RETURN_FAILURE(
isolate, NewTypeError(MessageTemplate::kCalledOnNonObject, fun_name));
}
// 2. Let key be ToPropertyKey(P).
// 3. ReturnIfAbrupt(key).
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, key, ToPropertyKey(isolate, key));
// 4. Let desc be ToPropertyDescriptor(Attributes).
// 5. ReturnIfAbrupt(desc).
PropertyDescriptor desc;
if (!PropertyDescriptor::ToPropertyDescriptor(isolate, attributes, &desc)) {
return isolate->heap()->exception();
}
// 6. Let success be DefinePropertyOrThrow(O,key, desc).
Maybe<bool> success = DefineOwnProperty(
isolate, Handle<JSReceiver>::cast(object), key, &desc, THROW_ON_ERROR);
// 7. ReturnIfAbrupt(success).
MAYBE_RETURN(success, isolate->heap()->exception());
CHECK(success.FromJust());
// 8. Return O.
return *object;
}
// ES6 19.1.2.3.1
// static
MaybeHandle<Object> JSReceiver::DefineProperties(Isolate* isolate,
Handle<Object> object,
Handle<Object> properties) {
// 1. If Type(O) is not Object, throw a TypeError exception.
if (!object->IsJSReceiver()) {
Handle<String> fun_name =
isolate->factory()->InternalizeUtf8String("Object.defineProperties");
THROW_NEW_ERROR(isolate,
NewTypeError(MessageTemplate::kCalledOnNonObject, fun_name),
Object);
}
// 2. Let props be ToObject(Properties).
// 3. ReturnIfAbrupt(props).
Handle<JSReceiver> props;
ASSIGN_RETURN_ON_EXCEPTION(isolate, props,
Object::ToObject(isolate, properties), Object);
// 4. Let keys be props.[[OwnPropertyKeys]]().
// 5. ReturnIfAbrupt(keys).
Handle<FixedArray> keys;
ASSIGN_RETURN_ON_EXCEPTION(
isolate, keys, KeyAccumulator::GetKeys(props, KeyCollectionMode::kOwnOnly,
ALL_PROPERTIES),
Object);
// 6. Let descriptors be an empty List.
int capacity = keys->length();
std::vector<PropertyDescriptor> descriptors(capacity);
size_t descriptors_index = 0;
// 7. Repeat for each element nextKey of keys in List order,
for (int i = 0; i < keys->length(); ++i) {
Handle<Object> next_key(keys->get(i), isolate);
// 7a. Let propDesc be props.[[GetOwnProperty]](nextKey).
// 7b. ReturnIfAbrupt(propDesc).
bool success = false;
LookupIterator it = LookupIterator::PropertyOrElement(
isolate, props, next_key, &success, LookupIterator::OWN);
DCHECK(success);
Maybe<PropertyAttributes> maybe = JSReceiver::GetPropertyAttributes(&it);
if (!maybe.IsJust()) return MaybeHandle<Object>();
PropertyAttributes attrs = maybe.FromJust();
// 7c. If propDesc is not undefined and propDesc.[[Enumerable]] is true:
if (attrs == ABSENT) continue;
if (attrs & DONT_ENUM) continue;
// 7c i. Let descObj be Get(props, nextKey).
// 7c ii. ReturnIfAbrupt(descObj).
Handle<Object> desc_obj;
ASSIGN_RETURN_ON_EXCEPTION(isolate, desc_obj, Object::GetProperty(&it),
Object);
// 7c iii. Let desc be ToPropertyDescriptor(descObj).
success = PropertyDescriptor::ToPropertyDescriptor(
isolate, desc_obj, &descriptors[descriptors_index]);
// 7c iv. ReturnIfAbrupt(desc).
if (!success) return MaybeHandle<Object>();
// 7c v. Append the pair (a two element List) consisting of nextKey and
// desc to the end of descriptors.
descriptors[descriptors_index].set_name(next_key);
descriptors_index++;
}
// 8. For each pair from descriptors in list order,
for (size_t i = 0; i < descriptors_index; ++i) {
PropertyDescriptor* desc = &descriptors[i];
// 8a. Let P be the first element of pair.
// 8b. Let desc be the second element of pair.
// 8c. Let status be DefinePropertyOrThrow(O, P, desc).
Maybe<bool> status =
DefineOwnProperty(isolate, Handle<JSReceiver>::cast(object),
desc->name(), desc, THROW_ON_ERROR);
// 8d. ReturnIfAbrupt(status).
if (!status.IsJust()) return MaybeHandle<Object>();
CHECK(status.FromJust());
}
// 9. Return o.
return object;
}
// static
Maybe<bool> JSReceiver::DefineOwnProperty(Isolate* isolate,
Handle<JSReceiver> object,
Handle<Object> key,
PropertyDescriptor* desc,
ShouldThrow should_throw) {
if (object->IsJSArray()) {
return JSArray::DefineOwnProperty(isolate, Handle<JSArray>::cast(object),
key, desc, should_throw);
}
if (object->IsJSProxy()) {
return JSProxy::DefineOwnProperty(isolate, Handle<JSProxy>::cast(object),
key, desc, should_throw);
}
if (object->IsJSTypedArray()) {
return JSTypedArray::DefineOwnProperty(
isolate, Handle<JSTypedArray>::cast(object), key, desc, should_throw);
}
// TODO(neis): Special case for JSModuleNamespace?
// OrdinaryDefineOwnProperty, by virtue of calling
// DefineOwnPropertyIgnoreAttributes, can handle arguments
// (ES#sec-arguments-exotic-objects-defineownproperty-p-desc).
return OrdinaryDefineOwnProperty(isolate, Handle<JSObject>::cast(object), key,
desc, should_throw);
}
// static
Maybe<bool> JSReceiver::OrdinaryDefineOwnProperty(Isolate* isolate,
Handle<JSObject> object,
Handle<Object> key,
PropertyDescriptor* desc,
ShouldThrow should_throw) {
bool success = false;
DCHECK(key->IsName() || key->IsNumber()); // |key| is a PropertyKey...
LookupIterator it = LookupIterator::PropertyOrElement(
isolate, object, key, &success, LookupIterator::OWN);
DCHECK(success); // ...so creating a LookupIterator can't fail.
// Deal with access checks first.
if (it.state() == LookupIterator::ACCESS_CHECK) {
if (!it.HasAccess()) {
isolate->ReportFailedAccessCheck(it.GetHolder<JSObject>());
RETURN_VALUE_IF_SCHEDULED_EXCEPTION(isolate, Nothing<bool>());
return Just(true);
}
it.Next();
}
// Handle interceptor
if (it.state() == LookupIterator::INTERCEPTOR) {
if (it.HolderIsReceiverOrHiddenPrototype()) {
Maybe<bool> result = DefinePropertyWithInterceptorInternal(
&it, it.GetInterceptor(), should_throw, *desc);
if (result.IsNothing() || result.FromJust()) {
return result;
}
}
}
return OrdinaryDefineOwnProperty(&it, desc, should_throw);
}
// ES6 9.1.6.1
// static
Maybe<bool> JSReceiver::OrdinaryDefineOwnProperty(LookupIterator* it,
PropertyDescriptor* desc,
ShouldThrow should_throw) {
Isolate* isolate = it->isolate();
// 1. Let current be O.[[GetOwnProperty]](P).
// 2. ReturnIfAbrupt(current).
PropertyDescriptor current;
MAYBE_RETURN(GetOwnPropertyDescriptor(it, ¤t), Nothing<bool>());
// TODO(jkummerow/verwaest): It would be nice if we didn't have to reset
// the iterator every time. Currently, the reasons why we need it are:
// - handle interceptors correctly
// - handle accessors correctly (which might change the holder's map)
it->Restart();
// 3. Let extensible be the value of the [[Extensible]] internal slot of O.
Handle<JSObject> object = Handle<JSObject>::cast(it->GetReceiver());
bool extensible = JSObject::IsExtensible(object);
return ValidateAndApplyPropertyDescriptor(isolate, it, extensible, desc,
¤t, should_throw);
}
// ES6 9.1.6.2
// static
Maybe<bool> JSReceiver::IsCompatiblePropertyDescriptor(
Isolate* isolate, bool extensible, PropertyDescriptor* desc,
PropertyDescriptor* current, Handle<Name> property_name,
ShouldThrow should_throw) {
// 1. Return ValidateAndApplyPropertyDescriptor(undefined, undefined,
// Extensible, Desc, Current).
return ValidateAndApplyPropertyDescriptor(
isolate, NULL, extensible, desc, current, should_throw, property_name);
}
// ES6 9.1.6.3
// static
Maybe<bool> JSReceiver::ValidateAndApplyPropertyDescriptor(
Isolate* isolate, LookupIterator* it, bool extensible,
PropertyDescriptor* desc, PropertyDescriptor* current,
ShouldThrow should_throw, Handle<Name> property_name) {
// We either need a LookupIterator, or a property name.
DCHECK((it == NULL) != property_name.is_null());
Handle<JSObject> object;
if (it != NULL) object = Handle<JSObject>::cast(it->GetReceiver());
bool desc_is_data_descriptor = PropertyDescriptor::IsDataDescriptor(desc);
bool desc_is_accessor_descriptor =
PropertyDescriptor::IsAccessorDescriptor(desc);
bool desc_is_generic_descriptor =
PropertyDescriptor::IsGenericDescriptor(desc);
// 1. (Assert)
// 2. If current is undefined, then
if (current->is_empty()) {
// 2a. If extensible is false, return false.
if (!extensible) {
RETURN_FAILURE(isolate, should_throw,
NewTypeError(MessageTemplate::kDefineDisallowed,
it != NULL ? it->GetName() : property_name));
}
// 2c. If IsGenericDescriptor(Desc) or IsDataDescriptor(Desc) is true, then:
// (This is equivalent to !IsAccessorDescriptor(desc).)
DCHECK((desc_is_generic_descriptor || desc_is_data_descriptor) ==
!desc_is_accessor_descriptor);
if (!desc_is_accessor_descriptor) {
// 2c i. If O is not undefined, create an own data property named P of
// object O whose [[Value]], [[Writable]], [[Enumerable]] and
// [[Configurable]] attribute values are described by Desc. If the value
// of an attribute field of Desc is absent, the attribute of the newly
// created property is set to its default value.
if (it != NULL) {
if (!desc->has_writable()) desc->set_writable(false);
if (!desc->has_enumerable()) desc->set_enumerable(false);
if (!desc->has_configurable()) desc->set_configurable(false);
Handle<Object> value(
desc->has_value()
? desc->value()
: Handle<Object>::cast(isolate->factory()->undefined_value()));
MaybeHandle<Object> result =
JSObject::DefineOwnPropertyIgnoreAttributes(it, value,
desc->ToAttributes());
if (result.is_null()) return Nothing<bool>();
}
} else {
// 2d. Else Desc must be an accessor Property Descriptor,
DCHECK(desc_is_accessor_descriptor);
// 2d i. If O is not undefined, create an own accessor property named P
// of object O whose [[Get]], [[Set]], [[Enumerable]] and
// [[Configurable]] attribute values are described by Desc. If the value
// of an attribute field of Desc is absent, the attribute of the newly
// created property is set to its default value.
if (it != NULL) {
if (!desc->has_enumerable()) desc->set_enumerable(false);
if (!desc->has_configurable()) desc->set_configurable(false);
Handle<Object> getter(
desc->has_get()
? desc->get()
: Handle<Object>::cast(isolate->factory()->null_value()));
Handle<Object> setter(
desc->has_set()
? desc->set()
: Handle<Object>::cast(isolate->factory()->null_value()));
MaybeHandle<Object> result =
JSObject::DefineAccessor(it, getter, setter, desc->ToAttributes());
if (result.is_null()) return Nothing<bool>();
}
}
// 2e. Return true.
return Just(true);
}
// 3. Return true, if every field in Desc is absent.
// 4. Return true, if every field in Desc also occurs in current and the
// value of every field in Desc is the same value as the corresponding field
// in current when compared using the SameValue algorithm.
if ((!desc->has_enumerable() ||
desc->enumerable() == current->enumerable()) &&
(!desc->has_configurable() ||
desc->configurable() == current->configurable()) &&
(!desc->has_value() ||
(current->has_value() && current->value()->SameValue(*desc->value()))) &&
(!desc->has_writable() ||
(current->has_writable() && current->writable() == desc->writable())) &&
(!desc->has_get() ||
(current->has_get() && current->get()->SameValue(*desc->get()))) &&
(!desc->has_set() ||
(current->has_set() && current->set()->SameValue(*desc->set())))) {
return Just(true);
}
// 5. If the [[Configurable]] field of current is false, then
if (!current->configurable()) {
// 5a. Return false, if the [[Configurable]] field of Desc is true.
if (desc->has_configurable() && desc->configurable()) {
RETURN_FAILURE(isolate, should_throw,
NewTypeError(MessageTemplate::kRedefineDisallowed,
it != NULL ? it->GetName() : property_name));
}
// 5b. Return false, if the [[Enumerable]] field of Desc is present and the
// [[Enumerable]] fields of current and Desc are the Boolean negation of
// each other.
if (desc->has_enumerable() && desc->enumerable() != current->enumerable()) {
RETURN_FAILURE(isolate, should_throw,
NewTypeError(MessageTemplate::kRedefineDisallowed,
it != NULL ? it->GetName() : property_name));
}
}
bool current_is_data_descriptor =
PropertyDescriptor::IsDataDescriptor(current);
// 6. If IsGenericDescriptor(Desc) is true, no further validation is required.
if (desc_is_generic_descriptor) {
// Nothing to see here.
// 7. Else if IsDataDescriptor(current) and IsDataDescriptor(Desc) have
// different results, then:
} else if (current_is_data_descriptor != desc_is_data_descriptor) {
// 7a. Return false, if the [[Configurable]] field of current is false.
if (!current->configurable()) {
RETURN_FAILURE(isolate, should_throw,
NewTypeError(MessageTemplate::kRedefineDisallowed,
it != NULL ? it->GetName() : property_name));
}
// 7b. If IsDataDescriptor(current) is true, then:
if (current_is_data_descriptor) {
// 7b i. If O is not undefined, convert the property named P of object O
// from a data property to an accessor property. Preserve the existing
// values of the converted property's [[Configurable]] and [[Enumerable]]
// attributes and set the rest of the property's attributes to their
// default values.
// --> Folded into step 10.
} else {
// 7c i. If O is not undefined, convert the property named P of object O
// from an accessor property to a data property. Preserve the existing
// values of the converted property’s [[Configurable]] and [[Enumerable]]
// attributes and set the rest of the property’s attributes to their
// default values.
// --> Folded into step 10.
}
// 8. Else if IsDataDescriptor(current) and IsDataDescriptor(Desc) are both
// true, then:
} else if (current_is_data_descriptor && desc_is_data_descriptor) {
// 8a. If the [[Configurable]] field of current is false, then:
if (!current->configurable()) {
// 8a i. Return false, if the [[Writable]] field of current is false and
// the [[Writable]] field of Desc is true.
if (!current->writable() && desc->has_writable() && desc->writable()) {
RETURN_FAILURE(
isolate, should_throw,
NewTypeError(MessageTemplate::kRedefineDisallowed,
it != NULL ? it->GetName() : property_name));
}
// 8a ii. If the [[Writable]] field of current is false, then:
if (!current->writable()) {
// 8a ii 1. Return false, if the [[Value]] field of Desc is present and
// SameValue(Desc.[[Value]], current.[[Value]]) is false.
if (desc->has_value() && !desc->value()->SameValue(*current->value())) {
RETURN_FAILURE(
isolate, should_throw,
NewTypeError(MessageTemplate::kRedefineDisallowed,
it != NULL ? it->GetName() : property_name));
}
}
}
} else {
// 9. Else IsAccessorDescriptor(current) and IsAccessorDescriptor(Desc)
// are both true,
DCHECK(PropertyDescriptor::IsAccessorDescriptor(current) &&
desc_is_accessor_descriptor);
// 9a. If the [[Configurable]] field of current is false, then:
if (!current->configurable()) {
// 9a i. Return false, if the [[Set]] field of Desc is present and
// SameValue(Desc.[[Set]], current.[[Set]]) is false.
if (desc->has_set() && !desc->set()->SameValue(*current->set())) {
RETURN_FAILURE(
isolate, should_throw,
NewTypeError(MessageTemplate::kRedefineDisallowed,
it != NULL ? it->GetName() : property_name));
}
// 9a ii. Return false, if the [[Get]] field of Desc is present and
// SameValue(Desc.[[Get]], current.[[Get]]) is false.
if (desc->has_get() && !desc->get()->SameValue(*current->get())) {
RETURN_FAILURE(
isolate, should_throw,
NewTypeError(MessageTemplate::kRedefineDisallowed,
it != NULL ? it->GetName() : property_name));
}
}
}
// 10. If O is not undefined, then:
if (it != NULL) {
// 10a. For each field of Desc that is present, set the corresponding
// attribute of the property named P of object O to the value of the field.
PropertyAttributes attrs = NONE;
if (desc->has_enumerable()) {
attrs = static_cast<PropertyAttributes>(
attrs | (desc->enumerable() ? NONE : DONT_ENUM));
} else {
attrs = static_cast<PropertyAttributes>(
attrs | (current->enumerable() ? NONE : DONT_ENUM));
}
if (desc->has_configurable()) {
attrs = static_cast<PropertyAttributes>(
attrs | (desc->configurable() ? NONE : DONT_DELETE));
} else {
attrs = static_cast<PropertyAttributes>(
attrs | (current->configurable() ? NONE : DONT_DELETE));
}
if (desc_is_data_descriptor ||
(desc_is_generic_descriptor && current_is_data_descriptor)) {
if (desc->has_writable()) {
attrs = static_cast<PropertyAttributes>(
attrs | (desc->writable() ? NONE : READ_ONLY));
} else {
attrs = static_cast<PropertyAttributes>(
attrs | (current->writable() ? NONE : READ_ONLY));
}
Handle<Object> value(
desc->has_value() ? desc->value()
: current->has_value()
? current->value()
: Handle<Object>::cast(
isolate->factory()->undefined_value()));
MaybeHandle<Object> result =
JSObject::DefineOwnPropertyIgnoreAttributes(it, value, attrs);
if (result.is_null()) return Nothing<bool>();
} else {
DCHECK(desc_is_accessor_descriptor ||
(desc_is_generic_descriptor &&
PropertyDescriptor::IsAccessorDescriptor(current)));
Handle<Object> getter(
desc->has_get()
? desc->get()
: current->has_get()
? current->get()
: Handle<Object>::cast(isolate->factory()->null_value()));
Handle<Object> setter(
desc->has_set()
? desc->set()
: current->has_set()
? current->set()
: Handle<Object>::cast(isolate->factory()->null_value()));
MaybeHandle<Object> result =
JSObject::DefineAccessor(it, getter, setter, attrs);
if (result.is_null()) return Nothing<bool>();
}
}
// 11. Return true.
return Just(true);
}
// static
Maybe<bool> JSReceiver::CreateDataProperty(LookupIterator* it,
Handle<Object> value,
ShouldThrow should_throw) {
DCHECK(!it->check_prototype_chain());
Handle<JSReceiver> receiver = Handle<JSReceiver>::cast(it->GetReceiver());
Isolate* isolate = receiver->GetIsolate();
if (receiver->IsJSObject()) {
return JSObject::CreateDataProperty(it, value, should_throw); // Shortcut.
}
PropertyDescriptor new_desc;
new_desc.set_value(value);
new_desc.set_writable(true);
new_desc.set_enumerable(true);
new_desc.set_configurable(true);
return JSReceiver::DefineOwnProperty(isolate, receiver, it->GetName(),
&new_desc, should_throw);
}
Maybe<bool> JSObject::CreateDataProperty(LookupIterator* it,
Handle<Object> value,
ShouldThrow should_throw) {
DCHECK(it->GetReceiver()->IsJSObject());
MAYBE_RETURN(JSReceiver::GetPropertyAttributes(it), Nothing<bool>());
Handle<JSReceiver> receiver = Handle<JSReceiver>::cast(it->GetReceiver());
Isolate* isolate = receiver->GetIsolate();
if (it->IsFound()) {
Maybe<PropertyAttributes> attributes = GetPropertyAttributes(it);
MAYBE_RETURN(attributes, Nothing<bool>());
if ((attributes.FromJust() & DONT_DELETE) != 0) {
RETURN_FAILURE(
isolate, should_throw,
NewTypeError(MessageTemplate::kRedefineDisallowed, it->GetName()));
}
} else {
if (!JSObject::IsExtensible(Handle<JSObject>::cast(it->GetReceiver()))) {
RETURN_FAILURE(
isolate, should_throw,
NewTypeError(MessageTemplate::kDefineDisallowed, it->GetName()));
}
}
RETURN_ON_EXCEPTION_VALUE(it->isolate(),
DefineOwnPropertyIgnoreAttributes(it, value, NONE),
Nothing<bool>());
return Just(true);
}
// TODO(jkummerow): Consider unification with FastAsArrayLength() in
// accessors.cc.
bool PropertyKeyToArrayLength(Handle<Object> value, uint32_t* length) {
DCHECK(value->IsNumber() || value->IsName());
if (value->ToArrayLength(length)) return true;
if (value->IsString()) return String::cast(*value)->AsArrayIndex(length);
return false;
}
bool PropertyKeyToArrayIndex(Handle<Object> index_obj, uint32_t* output) {
return PropertyKeyToArrayLength(index_obj, output) && *output != kMaxUInt32;
}
// ES6 9.4.2.1
// static
Maybe<bool> JSArray::DefineOwnProperty(Isolate* isolate, Handle<JSArray> o,
Handle<Object> name,
PropertyDescriptor* desc,
ShouldThrow should_throw) {
// 1. Assert: IsPropertyKey(P) is true. ("P" is |name|.)
// 2. If P is "length", then:
// TODO(jkummerow): Check if we need slow string comparison.
if (*name == isolate->heap()->length_string()) {
// 2a. Return ArraySetLength(A, Desc).
return ArraySetLength(isolate, o, desc, should_throw);
}
// 3. Else if P is an array index, then:
uint32_t index = 0;
if (PropertyKeyToArrayIndex(name, &index)) {
// 3a. Let oldLenDesc be OrdinaryGetOwnProperty(A, "length").
PropertyDescriptor old_len_desc;
Maybe<bool> success = GetOwnPropertyDescriptor(
isolate, o, isolate->factory()->length_string(), &old_len_desc);
// 3b. (Assert)
DCHECK(success.FromJust());
USE(success);
// 3c. Let oldLen be oldLenDesc.[[Value]].
uint32_t old_len = 0;
CHECK(old_len_desc.value()->ToArrayLength(&old_len));
// 3d. Let index be ToUint32(P).
// (Already done above.)
// 3e. (Assert)
// 3f. If index >= oldLen and oldLenDesc.[[Writable]] is false,
// return false.
if (index >= old_len && old_len_desc.has_writable() &&
!old_len_desc.writable()) {
RETURN_FAILURE(isolate, should_throw,
NewTypeError(MessageTemplate::kDefineDisallowed, name));
}
// 3g. Let succeeded be OrdinaryDefineOwnProperty(A, P, Desc).
Maybe<bool> succeeded =
OrdinaryDefineOwnProperty(isolate, o, name, desc, should_throw);
// 3h. Assert: succeeded is not an abrupt completion.
// In our case, if should_throw == THROW_ON_ERROR, it can be!
// 3i. If succeeded is false, return false.
if (succeeded.IsNothing() || !succeeded.FromJust()) return succeeded;
// 3j. If index >= oldLen, then:
if (index >= old_len) {
// 3j i. Set oldLenDesc.[[Value]] to index + 1.
old_len_desc.set_value(isolate->factory()->NewNumberFromUint(index + 1));
// 3j ii. Let succeeded be
// OrdinaryDefineOwnProperty(A, "length", oldLenDesc).
succeeded = OrdinaryDefineOwnProperty(isolate, o,
isolate->factory()->length_string(),
&old_len_desc, should_throw);
// 3j iii. Assert: succeeded is true.
DCHECK(succeeded.FromJust());
USE(succeeded);
}
// 3k. Return true.
return Just(true);
}
// 4. Return OrdinaryDefineOwnProperty(A, P, Desc).
return OrdinaryDefineOwnProperty(isolate, o, name, desc, should_throw);
}
// Part of ES6 9.4.2.4 ArraySetLength.
// static
bool JSArray::AnythingToArrayLength(Isolate* isolate,
Handle<Object> length_object,
uint32_t* output) {
// Fast path: check numbers and strings that can be converted directly
// and unobservably.
if (length_object->ToArrayLength(output)) return true;
if (length_object->IsString() &&
Handle<String>::cast(length_object)->AsArrayIndex(output)) {
return true;
}
// Slow path: follow steps in ES6 9.4.2.4 "ArraySetLength".
// 3. Let newLen be ToUint32(Desc.[[Value]]).
Handle<Object> uint32_v;
if (!Object::ToUint32(isolate, length_object).ToHandle(&uint32_v)) {
// 4. ReturnIfAbrupt(newLen).
return false;
}
// 5. Let numberLen be ToNumber(Desc.[[Value]]).
Handle<Object> number_v;
if (!Object::ToNumber(length_object).ToHandle(&number_v)) {
// 6. ReturnIfAbrupt(newLen).
return false;
}
// 7. If newLen != numberLen, throw a RangeError exception.
if (uint32_v->Number() != number_v->Number()) {
Handle<Object> exception =
isolate->factory()->NewRangeError(MessageTemplate::kInvalidArrayLength);
isolate->Throw(*exception);
return false;
}
CHECK(uint32_v->ToArrayLength(output));
return true;
}
// ES6 9.4.2.4
// static
Maybe<bool> JSArray::ArraySetLength(Isolate* isolate, Handle<JSArray> a,
PropertyDescriptor* desc,
ShouldThrow should_throw) {
// 1. If the [[Value]] field of Desc is absent, then
if (!desc->has_value()) {
// 1a. Return OrdinaryDefineOwnProperty(A, "length", Desc).
return OrdinaryDefineOwnProperty(
isolate, a, isolate->factory()->length_string(), desc, should_throw);
}
// 2. Let newLenDesc be a copy of Desc.
// (Actual copying is not necessary.)
PropertyDescriptor* new_len_desc = desc;
// 3. - 7. Convert Desc.[[Value]] to newLen.
uint32_t new_len = 0;
if (!AnythingToArrayLength(isolate, desc->value(), &new_len)) {
DCHECK(isolate->has_pending_exception());
return Nothing<bool>();
}
// 8. Set newLenDesc.[[Value]] to newLen.
// (Done below, if needed.)
// 9. Let oldLenDesc be OrdinaryGetOwnProperty(A, "length").
PropertyDescriptor old_len_desc;
Maybe<bool> success = GetOwnPropertyDescriptor(
isolate, a, isolate->factory()->length_string(), &old_len_desc);
// 10. (Assert)
DCHECK(success.FromJust());
USE(success);
// 11. Let oldLen be oldLenDesc.[[Value]].
uint32_t old_len = 0;
CHECK(old_len_desc.value()->ToArrayLength(&old_len));
// 12. If newLen >= oldLen, then
if (new_len >= old_len) {
// 8. Set newLenDesc.[[Value]] to newLen.
// 12a. Return OrdinaryDefineOwnProperty(A, "length", newLenDesc).
new_len_desc->set_value(isolate->factory()->NewNumberFromUint(new_len));
return OrdinaryDefineOwnProperty(isolate, a,
isolate->factory()->length_string(),
new_len_desc, should_throw);
}
// 13. If oldLenDesc.[[Writable]] is false, return false.
if (!old_len_desc.writable()) {
RETURN_FAILURE(isolate, should_throw,
NewTypeError(MessageTemplate::kRedefineDisallowed,
isolate->factory()->length_string()));
}
// 14. If newLenDesc.[[Writable]] is absent or has the value true,
// let newWritable be true.
bool new_writable = false;
if (!new_len_desc->has_writable() || new_len_desc->writable()) {
new_writable = true;
} else {
// 15. Else,
// 15a. Need to defer setting the [[Writable]] attribute to false in case
// any elements cannot be deleted.
// 15b. Let newWritable be false. (It's initialized as "false" anyway.)
// 15c. Set newLenDesc.[[Writable]] to true.
// (Not needed.)
}
// Most of steps 16 through 19 is implemented by JSArray::SetLength.
JSArray::SetLength(a, new_len);
// Steps 19d-ii, 20.
if (!new_writable) {
PropertyDescriptor readonly;
readonly.set_writable(false);
Maybe<bool> success = OrdinaryDefineOwnProperty(
isolate, a, isolate->factory()->length_string(), &readonly,
should_throw);
DCHECK(success.FromJust());
USE(success);
}
uint32_t actual_new_len = 0;
CHECK(a->length()->ToArrayLength(&actual_new_len));
// Steps 19d-v, 21. Return false if there were non-deletable elements.
bool result = actual_new_len == new_len;
if (!result) {
RETURN_FAILURE(
isolate, should_throw,
NewTypeError(MessageTemplate::kStrictDeleteProperty,
isolate->factory()->NewNumberFromUint(actual_new_len - 1),
a));
}
return Just(result);
}
// ES6 9.5.6
// static
Maybe<bool> JSProxy::DefineOwnProperty(Isolate* isolate, Handle<JSProxy> proxy,
Handle<Object> key,
PropertyDescriptor* desc,
ShouldThrow should_throw) {
STACK_CHECK(isolate, Nothing<bool>());
if (key->IsSymbol() && Handle<Symbol>::cast(key)->IsPrivate()) {
return SetPrivateProperty(isolate, proxy, Handle<Symbol>::cast(key), desc,
should_throw);
}
Handle<String> trap_name = isolate->factory()->defineProperty_string();
// 1. Assert: IsPropertyKey(P) is true.
DCHECK(key->IsName() || key->IsNumber());
// 2. Let handler be the value of the [[ProxyHandler]] internal slot of O.
Handle<Object> handler(proxy->handler(), isolate);
// 3. If handler is null, throw a TypeError exception.
// 4. Assert: Type(handler) is Object.
if (proxy->IsRevoked()) {
isolate->Throw(*isolate->factory()->NewTypeError(
MessageTemplate::kProxyRevoked, trap_name));
return Nothing<bool>();
}
// 5. Let target be the value of the [[ProxyTarget]] internal slot of O.
Handle<JSReceiver> target(proxy->target(), isolate);
// 6. Let trap be ? GetMethod(handler, "defineProperty").
Handle<Object> trap;
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
isolate, trap,
Object::GetMethod(Handle<JSReceiver>::cast(handler), trap_name),
Nothing<bool>());
// 7. If trap is undefined, then:
if (trap->IsUndefined(isolate)) {
// 7a. Return target.[[DefineOwnProperty]](P, Desc).
return JSReceiver::DefineOwnProperty(isolate, target, key, desc,
should_throw);
}
// 8. Let descObj be FromPropertyDescriptor(Desc).
Handle<Object> desc_obj = desc->ToObject(isolate);
// 9. Let booleanTrapResult be
// ToBoolean(? Call(trap, handler, «target, P, descObj»)).
Handle<Name> property_name =
key->IsName()
? Handle<Name>::cast(key)
: Handle<Name>::cast(isolate->factory()->NumberToString(key));
// Do not leak private property names.
DCHECK(!property_name->IsPrivate());
Handle<Object> trap_result_obj;
Handle<Object> args[] = {target, property_name, desc_obj};
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
isolate, trap_result_obj,
Execution::Call(isolate, trap, handler, arraysize(args), args),
Nothing<bool>());
// 10. If booleanTrapResult is false, return false.
if (!trap_result_obj->BooleanValue()) {
RETURN_FAILURE(isolate, should_throw,
NewTypeError(MessageTemplate::kProxyTrapReturnedFalsishFor,
trap_name, property_name));
}
// 11. Let targetDesc be ? target.[[GetOwnProperty]](P).
PropertyDescriptor target_desc;
Maybe<bool> target_found =
JSReceiver::GetOwnPropertyDescriptor(isolate, target, key, &target_desc);
MAYBE_RETURN(target_found, Nothing<bool>());
// 12. Let extensibleTarget be ? IsExtensible(target).
Maybe<bool> maybe_extensible = JSReceiver::IsExtensible(target);
MAYBE_RETURN(maybe_extensible, Nothing<bool>());
bool extensible_target = maybe_extensible.FromJust();
// 13. If Desc has a [[Configurable]] field and if Desc.[[Configurable]]
// is false, then:
// 13a. Let settingConfigFalse be true.
// 14. Else let settingConfigFalse be false.
bool setting_config_false = desc->has_configurable() && !desc->configurable();
// 15. If targetDesc is undefined, then
if (!target_found.FromJust()) {
// 15a. If extensibleTarget is false, throw a TypeError exception.
if (!extensible_target) {
isolate->Throw(*isolate->factory()->NewTypeError(
MessageTemplate::kProxyDefinePropertyNonExtensible, property_name));
return Nothing<bool>();
}
// 15b. If settingConfigFalse is true, throw a TypeError exception.
if (setting_config_false) {
isolate->Throw(*isolate->factory()->NewTypeError(
MessageTemplate::kProxyDefinePropertyNonConfigurable, property_name));
return Nothing<bool>();
}
} else {
// 16. Else targetDesc is not undefined,
// 16a. If IsCompatiblePropertyDescriptor(extensibleTarget, Desc,
// targetDesc) is false, throw a TypeError exception.
Maybe<bool> valid =
IsCompatiblePropertyDescriptor(isolate, extensible_target, desc,
&target_desc, property_name, DONT_THROW);
MAYBE_RETURN(valid, Nothing<bool>());
if (!valid.FromJust()) {
isolate->Throw(*isolate->factory()->NewTypeError(
MessageTemplate::kProxyDefinePropertyIncompatible, property_name));
return Nothing<bool>();
}
// 16b. If settingConfigFalse is true and targetDesc.[[Configurable]] is
// true, throw a TypeError exception.
if (setting_config_false && target_desc.configurable()) {
isolate->Throw(*isolate->factory()->NewTypeError(
MessageTemplate::kProxyDefinePropertyNonConfigurable, property_name));
return Nothing<bool>();
}
}
// 17. Return true.
return Just(true);
}
// static
Maybe<bool> JSProxy::SetPrivateProperty(Isolate* isolate, Handle<JSProxy> proxy,
Handle<Symbol> private_name,
PropertyDescriptor* desc,
ShouldThrow should_throw) {
// Despite the generic name, this can only add private data properties.
if (!PropertyDescriptor::IsDataDescriptor(desc) ||
desc->ToAttributes() != DONT_ENUM) {
RETURN_FAILURE(isolate, should_throw,
NewTypeError(MessageTemplate::kProxyPrivate));
}
DCHECK(proxy->map()->is_dictionary_map());
Handle<Object> value =
desc->has_value()
? desc->value()
: Handle<Object>::cast(isolate->factory()->undefined_value());
LookupIterator it(proxy, private_name, proxy);
if (it.IsFound()) {
DCHECK_EQ(LookupIterator::DATA, it.state());
DCHECK_EQ(DONT_ENUM, it.property_attributes());
it.WriteDataValue(value, false);
return Just(true);
}
Handle<NameDictionary> dict(proxy->property_dictionary());
PropertyDetails details(kData, DONT_ENUM, 0, PropertyCellType::kNoCell);
Handle<NameDictionary> result =
NameDictionary::Add(dict, private_name, value, details);
if (!dict.is_identical_to(result)) proxy->set_properties(*result);
return Just(true);
}
// static
Maybe<bool> JSReceiver::GetOwnPropertyDescriptor(Isolate* isolate,
Handle<JSReceiver> object,
Handle<Object> key,
PropertyDescriptor* desc) {
bool success = false;
DCHECK(key->IsName() || key->IsNumber()); // |key| is a PropertyKey...
LookupIterator it = LookupIterator::PropertyOrElement(
isolate, object, key, &success, LookupIterator::OWN);
DCHECK(success); // ...so creating a LookupIterator can't fail.
return GetOwnPropertyDescriptor(&it, desc);
}
namespace {
Maybe<bool> GetPropertyDescriptorWithInterceptor(LookupIterator* it,
PropertyDescriptor* desc) {
bool has_access = true;
if (it->state() == LookupIterator::ACCESS_CHECK) {
has_access = it->HasAccess() || JSObject::AllCanRead(it);
it->Next();
}
if (has_access && it->state() == LookupIterator::INTERCEPTOR) {
Isolate* isolate = it->isolate();
Handle<InterceptorInfo> interceptor = it->GetInterceptor();
if (!interceptor->descriptor()->IsUndefined(isolate)) {
Handle<Object> result;
Handle<JSObject> holder = it->GetHolder<JSObject>();
Handle<Object> receiver = it->GetReceiver();
if (!receiver->IsJSReceiver()) {
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
isolate, receiver, Object::ConvertReceiver(isolate, receiver),
Nothing<bool>());
}
PropertyCallbackArguments args(isolate, interceptor->data(), *receiver,
*holder, Object::DONT_THROW);
if (it->IsElement()) {
uint32_t index = it->index();
v8::IndexedPropertyDescriptorCallback descriptorCallback =
v8::ToCData<v8::IndexedPropertyDescriptorCallback>(
interceptor->descriptor());
result = args.Call(descriptorCallback, index);
} else {
Handle<Name> name = it->name();
DCHECK(!name->IsPrivate());
v8::GenericNamedPropertyDescriptorCallback descriptorCallback =
v8::ToCData<v8::GenericNamedPropertyDescriptorCallback>(
interceptor->descriptor());
result = args.Call(descriptorCallback, name);
}
if (!result.is_null()) {
// Request successfully intercepted, try to set the property
// descriptor.
Utils::ApiCheck(
PropertyDescriptor::ToPropertyDescriptor(isolate, result, desc),
it->IsElement() ? "v8::IndexedPropertyDescriptorCallback"
: "v8::NamedPropertyDescriptorCallback",
"Invalid property descriptor.");
return Just(true);
}
}
}
it->Restart();
return Just(false);
}
} // namespace
// ES6 9.1.5.1
// Returns true on success, false if the property didn't exist, nothing if
// an exception was thrown.
// static
Maybe<bool> JSReceiver::GetOwnPropertyDescriptor(LookupIterator* it,
PropertyDescriptor* desc) {
Isolate* isolate = it->isolate();
// "Virtual" dispatch.
if (it->IsFound() && it->GetHolder<JSReceiver>()->IsJSProxy()) {
return JSProxy::GetOwnPropertyDescriptor(isolate, it->GetHolder<JSProxy>(),
it->GetName(), desc);
}
Maybe<bool> intercepted = GetPropertyDescriptorWithInterceptor(it, desc);
MAYBE_RETURN(intercepted, Nothing<bool>());
if (intercepted.FromJust()) {
return Just(true);
}
// Request was not intercepted, continue as normal.
// 1. (Assert)
// 2. If O does not have an own property with key P, return undefined.
Maybe<PropertyAttributes> maybe = JSObject::GetPropertyAttributes(it);
MAYBE_RETURN(maybe, Nothing<bool>());
PropertyAttributes attrs = maybe.FromJust();
if (attrs == ABSENT) return Just(false);
DCHECK(!isolate->has_pending_exception());
// 3. Let D be a newly created Property Descriptor with no fields.
DCHECK(desc->is_empty());
// 4. Let X be O's own property whose key is P.
// 5. If X is a data property, then
bool is_accessor_pair = it->state() == LookupIterator::ACCESSOR &&
it->GetAccessors()->IsAccessorPair();
if (!is_accessor_pair) {
// 5a. Set D.[[Value]] to the value of X's [[Value]] attribute.
Handle<Object> value;
if (!Object::GetProperty(it).ToHandle(&value)) {
DCHECK(isolate->has_pending_exception());
return Nothing<bool>();
}
desc->set_value(value);
// 5b. Set D.[[Writable]] to the value of X's [[Writable]] attribute
desc->set_writable((attrs & READ_ONLY) == 0);
} else {
// 6. Else X is an accessor property, so
Handle<AccessorPair> accessors =
Handle<AccessorPair>::cast(it->GetAccessors());
// 6a. Set D.[[Get]] to the value of X's [[Get]] attribute.
desc->set_get(AccessorPair::GetComponent(accessors, ACCESSOR_GETTER));
// 6b. Set D.[[Set]] to the value of X's [[Set]] attribute.
desc->set_set(AccessorPair::GetComponent(accessors, ACCESSOR_SETTER));
}
// 7. Set D.[[Enumerable]] to the value of X's [[Enumerable]] attribute.
desc->set_enumerable((attrs & DONT_ENUM) == 0);
// 8. Set D.[[Configurable]] to the value of X's [[Configurable]] attribute.
desc->set_configurable((attrs & DONT_DELETE) == 0);
// 9. Return D.
DCHECK(PropertyDescriptor::IsAccessorDescriptor(desc) !=
PropertyDescriptor::IsDataDescriptor(desc));
return Just(true);
}
// ES6 9.5.5
// static
Maybe<bool> JSProxy::GetOwnPropertyDescriptor(Isolate* isolate,
Handle<JSProxy> proxy,
Handle<Name> name,
PropertyDescriptor* desc) {
DCHECK(!name->IsPrivate());
STACK_CHECK(isolate, Nothing<bool>());
Handle<String> trap_name =
isolate->factory()->getOwnPropertyDescriptor_string();
// 1. (Assert)
// 2. Let handler be the value of the [[ProxyHandler]] internal slot of O.
Handle<Object> handler(proxy->handler(), isolate);
// 3. If handler is null, throw a TypeError exception.
// 4. Assert: Type(handler) is Object.
if (proxy->IsRevoked()) {
isolate->Throw(*isolate->factory()->NewTypeError(
MessageTemplate::kProxyRevoked, trap_name));
return Nothing<bool>();
}
// 5. Let target be the value of the [[ProxyTarget]] internal slot of O.
Handle<JSReceiver> target(proxy->target(), isolate);
// 6. Let trap be ? GetMethod(handler, "getOwnPropertyDescriptor").
Handle<Object> trap;
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
isolate, trap,
Object::GetMethod(Handle<JSReceiver>::cast(handler), trap_name),
Nothing<bool>());
// 7. If trap is undefined, then
if (trap->IsUndefined(isolate)) {
// 7a. Return target.[[GetOwnProperty]](P).
return JSReceiver::GetOwnPropertyDescriptor(isolate, target, name, desc);
}
// 8. Let trapResultObj be ? Call(trap, handler, «target, P»).
Handle<Object> trap_result_obj;
Handle<Object> args[] = {target, name};
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
isolate, trap_result_obj,
Execution::Call(isolate, trap, handler, arraysize(args), args),
Nothing<bool>());
// 9. If Type(trapResultObj) is neither Object nor Undefined, throw a
// TypeError exception.
if (!trap_result_obj->IsJSReceiver() &&
!trap_result_obj->IsUndefined(isolate)) {
isolate->Throw(*isolate->factory()->NewTypeError(
MessageTemplate::kProxyGetOwnPropertyDescriptorInvalid, name));
return Nothing<bool>();
}
// 10. Let targetDesc be ? target.[[GetOwnProperty]](P).
PropertyDescriptor target_desc;
Maybe<bool> found =
JSReceiver::GetOwnPropertyDescriptor(isolate, target, name, &target_desc);
MAYBE_RETURN(found, Nothing<bool>());
// 11. If trapResultObj is undefined, then
if (trap_result_obj->IsUndefined(isolate)) {
// 11a. If targetDesc is undefined, return undefined.
if (!found.FromJust()) return Just(false);
// 11b. If targetDesc.[[Configurable]] is false, throw a TypeError
// exception.
if (!target_desc.configurable()) {
isolate->Throw(*isolate->factory()->NewTypeError(
MessageTemplate::kProxyGetOwnPropertyDescriptorUndefined, name));
return Nothing<bool>();
}
// 11c. Let extensibleTarget be ? IsExtensible(target).
Maybe<bool> extensible_target = JSReceiver::IsExtensible(target);
MAYBE_RETURN(extensible_target, Nothing<bool>());
// 11d. (Assert)
// 11e. If extensibleTarget is false, throw a TypeError exception.
if (!extensible_target.FromJust()) {
isolate->Throw(*isolate->factory()->NewTypeError(
MessageTemplate::kProxyGetOwnPropertyDescriptorNonExtensible, name));
return Nothing<bool>();
}
// 11f. Return undefined.
return Just(false);
}
// 12. Let extensibleTarget be ? IsExtensible(target).
Maybe<bool> extensible_target = JSReceiver::IsExtensible(target);
MAYBE_RETURN(extensible_target, Nothing<bool>());
// 13. Let resultDesc be ? ToPropertyDescriptor(trapResultObj).
if (!PropertyDescriptor::ToPropertyDescriptor(isolate, trap_result_obj,
desc)) {
DCHECK(isolate->has_pending_exception());
return Nothing<bool>();
}
// 14. Call CompletePropertyDescriptor(resultDesc).
PropertyDescriptor::CompletePropertyDescriptor(isolate, desc);
// 15. Let valid be IsCompatiblePropertyDescriptor (extensibleTarget,
// resultDesc, targetDesc).
Maybe<bool> valid =
IsCompatiblePropertyDescriptor(isolate, extensible_target.FromJust(),
desc, &target_desc, name, DONT_THROW);
MAYBE_RETURN(valid, Nothing<bool>());
// 16. If valid is false, throw a TypeError exception.
if (!valid.FromJust()) {
isolate->Throw(*isolate->factory()->NewTypeError(
MessageTemplate::kProxyGetOwnPropertyDescriptorIncompatible, name));
return Nothing<bool>();
}
// 17. If resultDesc.[[Configurable]] is false, then
if (!desc->configurable()) {
// 17a. If targetDesc is undefined or targetDesc.[[Configurable]] is true:
if (target_desc.is_empty() || target_desc.configurable()) {
// 17a i. Throw a TypeError exception.
isolate->Throw(*isolate->factory()->NewTypeError(
MessageTemplate::kProxyGetOwnPropertyDescriptorNonConfigurable,
name));
return Nothing<bool>();
}
}
// 18. Return resultDesc.
return Just(true);
}
bool JSObject::ReferencesObjectFromElements(FixedArray* elements,
ElementsKind kind,
Object* object) {
Isolate* isolate = elements->GetIsolate();
if (IsFastObjectElementsKind(kind) || kind == FAST_STRING_WRAPPER_ELEMENTS) {
int length = IsJSArray()
? Smi::cast(JSArray::cast(this)->length())->value()
: elements->length();
for (int i = 0; i < length; ++i) {
Object* element = elements->get(i);
if (!element->IsTheHole(isolate) && element == object) return true;
}
} else {
DCHECK(kind == DICTIONARY_ELEMENTS || kind == SLOW_STRING_WRAPPER_ELEMENTS);
Object* key =
SeededNumberDictionary::cast(elements)->SlowReverseLookup(object);
if (!key->IsUndefined(isolate)) return true;
}
return false;
}
// Check whether this object references another object.
bool JSObject::ReferencesObject(Object* obj) {
Map* map_of_this = map();
Heap* heap = GetHeap();
DisallowHeapAllocation no_allocation;
// Is the object the constructor for this object?
if (map_of_this->GetConstructor() == obj) {
return true;
}
// Is the object the prototype for this object?
if (map_of_this->prototype() == obj) {
return true;
}
// Check if the object is among the named properties.
Object* key = SlowReverseLookup(obj);
if (!key->IsUndefined(heap->isolate())) {
return true;
}
// Check if the object is among the indexed properties.
ElementsKind kind = GetElementsKind();
switch (kind) {
// Raw pixels and external arrays do not reference other
// objects.
#define TYPED_ARRAY_CASE(Type, type, TYPE, ctype, size) \
case TYPE##_ELEMENTS: \
break;
TYPED_ARRAYS(TYPED_ARRAY_CASE)
#undef TYPED_ARRAY_CASE
case FAST_DOUBLE_ELEMENTS:
case FAST_HOLEY_DOUBLE_ELEMENTS:
break;
case FAST_SMI_ELEMENTS:
case FAST_HOLEY_SMI_ELEMENTS:
break;
case FAST_ELEMENTS:
case FAST_HOLEY_ELEMENTS:
case DICTIONARY_ELEMENTS:
case FAST_STRING_WRAPPER_ELEMENTS:
case SLOW_STRING_WRAPPER_ELEMENTS: {
FixedArray* elements = FixedArray::cast(this->elements());
if (ReferencesObjectFromElements(elements, kind, obj)) return true;
break;
}
case FAST_SLOPPY_ARGUMENTS_ELEMENTS:
case SLOW_SLOPPY_ARGUMENTS_ELEMENTS: {
FixedArray* parameter_map = FixedArray::cast(elements());
// Check the mapped parameters.
int length = parameter_map->length();
for (int i = 2; i < length; ++i) {
Object* value = parameter_map->get(i);
if (!value->IsTheHole(heap->isolate()) && value == obj) return true;
}
// Check the arguments.
FixedArray* arguments = FixedArray::cast(parameter_map->get(1));
kind = arguments->IsDictionary() ? DICTIONARY_ELEMENTS :
FAST_HOLEY_ELEMENTS;
if (ReferencesObjectFromElements(arguments, kind, obj)) return true;
break;
}
case NO_ELEMENTS:
break;
}
// For functions check the context.
if (IsJSFunction()) {
// Get the constructor function for arguments array.
Map* arguments_map =
heap->isolate()->context()->native_context()->sloppy_arguments_map();
JSFunction* arguments_function =
JSFunction::cast(arguments_map->GetConstructor());
// Get the context and don't check if it is the native context.
JSFunction* f = JSFunction::cast(this);
Context* context = f->context();
if (context->IsNativeContext()) {
return false;
}
// Check the non-special context slots.
for (int i = Context::MIN_CONTEXT_SLOTS; i < context->length(); i++) {
// Only check JS objects.
if (context->get(i)->IsJSObject()) {
JSObject* ctxobj = JSObject::cast(context->get(i));
// If it is an arguments array check the content.
if (ctxobj->map()->GetConstructor() == arguments_function) {
if (ctxobj->ReferencesObject(obj)) {
return true;
}
} else if (ctxobj == obj) {
return true;
}
}
}
// Check the context extension (if any) if it can have references.
if (context->has_extension() && !context->IsCatchContext()) {
// With harmony scoping, a JSFunction may have a script context.
// TODO(mvstanton): walk into the ScopeInfo.
if (context->IsScriptContext()) {
return false;
}
return context->extension_object()->ReferencesObject(obj);
}
}
// No references to object.
return false;
}
Maybe<bool> JSReceiver::SetIntegrityLevel(Handle<JSReceiver> receiver,
IntegrityLevel level,
ShouldThrow should_throw) {
DCHECK(level == SEALED || level == FROZEN);
if (receiver->IsJSObject()) {
Handle<JSObject> object = Handle<JSObject>::cast(receiver);
if (!object->HasSloppyArgumentsElements()) { // Fast path.
if (level == SEALED) {
return JSObject::PreventExtensionsWithTransition<SEALED>(object,
should_throw);
} else {
return JSObject::PreventExtensionsWithTransition<FROZEN>(object,
should_throw);
}
}
}
Isolate* isolate = receiver->GetIsolate();
MAYBE_RETURN(JSReceiver::PreventExtensions(receiver, should_throw),
Nothing<bool>());
Handle<FixedArray> keys;
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
isolate, keys, JSReceiver::OwnPropertyKeys(receiver), Nothing<bool>());
PropertyDescriptor no_conf;
no_conf.set_configurable(false);
PropertyDescriptor no_conf_no_write;
no_conf_no_write.set_configurable(false);
no_conf_no_write.set_writable(false);
if (level == SEALED) {
for (int i = 0; i < keys->length(); ++i) {
Handle<Object> key(keys->get(i), isolate);
MAYBE_RETURN(
DefineOwnProperty(isolate, receiver, key, &no_conf, THROW_ON_ERROR),
Nothing<bool>());
}
return Just(true);
}
for (int i = 0; i < keys->length(); ++i) {
Handle<Object> key(keys->get(i), isolate);
PropertyDescriptor current_desc;
Maybe<bool> owned = JSReceiver::GetOwnPropertyDescriptor(
isolate, receiver, key, ¤t_desc);
MAYBE_RETURN(owned, Nothing<bool>());
if (owned.FromJust()) {
PropertyDescriptor desc =
PropertyDescriptor::IsAccessorDescriptor(¤t_desc)
? no_conf
: no_conf_no_write;
MAYBE_RETURN(
DefineOwnProperty(isolate, receiver, key, &desc, THROW_ON_ERROR),
Nothing<bool>());
}
}
return Just(true);
}
Maybe<bool> JSReceiver::TestIntegrityLevel(Handle<JSReceiver> object,
IntegrityLevel level) {
DCHECK(level == SEALED || level == FROZEN);
Isolate* isolate = object->GetIsolate();
Maybe<bool> extensible = JSReceiver::IsExtensible(object);
MAYBE_RETURN(extensible, Nothing<bool>());
if (extensible.FromJust()) return Just(false);
Handle<FixedArray> keys;
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
isolate, keys, JSReceiver::OwnPropertyKeys(object), Nothing<bool>());
for (int i = 0; i < keys->length(); ++i) {
Handle<Object> key(keys->get(i), isolate);
PropertyDescriptor current_desc;
Maybe<bool> owned = JSReceiver::GetOwnPropertyDescriptor(
isolate, object, key, ¤t_desc);
MAYBE_RETURN(owned, Nothing<bool>());
if (owned.FromJust()) {
if (current_desc.configurable()) return Just(false);
if (level == FROZEN &&
PropertyDescriptor::IsDataDescriptor(¤t_desc) &&
current_desc.writable()) {
return Just(false);
}
}
}
return Just(true);
}
Maybe<bool> JSReceiver::PreventExtensions(Handle<JSReceiver> object,
ShouldThrow should_throw) {
if (object->IsJSProxy()) {
return JSProxy::PreventExtensions(Handle<JSProxy>::cast(object),
should_throw);
}
DCHECK(object->IsJSObject());
return JSObject::PreventExtensions(Handle<JSObject>::cast(object),
should_throw);
}
Maybe<bool> JSProxy::PreventExtensions(Handle<JSProxy> proxy,
ShouldThrow should_throw) {
Isolate* isolate = proxy->GetIsolate();
STACK_CHECK(isolate, Nothing<bool>());
Factory* factory = isolate->factory();
Handle<String> trap_name = factory->preventExtensions_string();
if (proxy->IsRevoked()) {
isolate->Throw(
*factory->NewTypeError(MessageTemplate::kProxyRevoked, trap_name));
return Nothing<bool>();
}
Handle<JSReceiver> target(proxy->target(), isolate);
Handle<JSReceiver> handler(JSReceiver::cast(proxy->handler()), isolate);
Handle<Object> trap;
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
isolate, trap, Object::GetMethod(handler, trap_name), Nothing<bool>());
if (trap->IsUndefined(isolate)) {
return JSReceiver::PreventExtensions(target, should_throw);
}
Handle<Object> trap_result;
Handle<Object> args[] = {target};
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
isolate, trap_result,
Execution::Call(isolate, trap, handler, arraysize(args), args),
Nothing<bool>());
if (!trap_result->BooleanValue()) {
RETURN_FAILURE(
isolate, should_throw,
NewTypeError(MessageTemplate::kProxyTrapReturnedFalsish, trap_name));
}
// Enforce the invariant.
Maybe<bool> target_result = JSReceiver::IsExtensible(target);
MAYBE_RETURN(target_result, Nothing<bool>());
if (target_result.FromJust()) {
isolate->Throw(*factory->NewTypeError(
MessageTemplate::kProxyPreventExtensionsExtensible));
return Nothing<bool>();
}
return Just(true);
}
Maybe<bool> JSObject::PreventExtensions(Handle<JSObject> object,
ShouldThrow should_throw) {
Isolate* isolate = object->GetIsolate();
if (!object->HasSloppyArgumentsElements()) {
return PreventExtensionsWithTransition<NONE>(object, should_throw);
}
if (object->IsAccessCheckNeeded() &&
!isolate->MayAccess(handle(isolate->context()), object)) {
isolate->ReportFailedAccessCheck(object);
RETURN_VALUE_IF_SCHEDULED_EXCEPTION(isolate, Nothing<bool>());
RETURN_FAILURE(isolate, should_throw,
NewTypeError(MessageTemplate::kNoAccess));
}
if (!object->map()->is_extensible()) return Just(true);
if (object->IsJSGlobalProxy()) {
PrototypeIterator iter(isolate, object);
if (iter.IsAtEnd()) return Just(true);
DCHECK(PrototypeIterator::GetCurrent(iter)->IsJSGlobalObject());
return PreventExtensions(PrototypeIterator::GetCurrent<JSObject>(iter),
should_throw);
}
if (!object->HasFixedTypedArrayElements()) {
// If there are fast elements we normalize.
Handle<SeededNumberDictionary> dictionary = NormalizeElements(object);
DCHECK(object->HasDictionaryElements() ||
object->HasSlowArgumentsElements());
// Make sure that we never go back to fast case.
object->RequireSlowElements(*dictionary);
}
// Do a map transition, other objects with this map may still
// be extensible.
// TODO(adamk): Extend the NormalizedMapCache to handle non-extensible maps.
Handle<Map> new_map = Map::Copy(handle(object->map()), "PreventExtensions");
new_map->set_is_extensible(false);
JSObject::MigrateToMap(object, new_map);
DCHECK(!object->map()->is_extensible());
return Just(true);
}
Maybe<bool> JSReceiver::IsExtensible(Handle<JSReceiver> object) {
if (object->IsJSProxy()) {
return JSProxy::IsExtensible(Handle<JSProxy>::cast(object));
}
return Just(JSObject::IsExtensible(Handle<JSObject>::cast(object)));
}
Maybe<bool> JSProxy::IsExtensible(Handle<JSProxy> proxy) {
Isolate* isolate = proxy->GetIsolate();
STACK_CHECK(isolate, Nothing<bool>());
Factory* factory = isolate->factory();
Handle<String> trap_name = factory->isExtensible_string();
if (proxy->IsRevoked()) {
isolate->Throw(
*factory->NewTypeError(MessageTemplate::kProxyRevoked, trap_name));
return Nothing<bool>();
}
Handle<JSReceiver> target(proxy->target(), isolate);
Handle<JSReceiver> handler(JSReceiver::cast(proxy->handler()), isolate);
Handle<Object> trap;
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
isolate, trap, Object::GetMethod(handler, trap_name), Nothing<bool>());
if (trap->IsUndefined(isolate)) {
return JSReceiver::IsExtensible(target);
}
Handle<Object> trap_result;
Handle<Object> args[] = {target};
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
isolate, trap_result,
Execution::Call(isolate, trap, handler, arraysize(args), args),
Nothing<bool>());
// Enforce the invariant.
Maybe<bool> target_result = JSReceiver::IsExtensible(target);
MAYBE_RETURN(target_result, Nothing<bool>());
if (target_result.FromJust() != trap_result->BooleanValue()) {
isolate->Throw(
*factory->NewTypeError(MessageTemplate::kProxyIsExtensibleInconsistent,
factory->ToBoolean(target_result.FromJust())));
return Nothing<bool>();
}
return target_result;
}
bool JSObject::IsExtensible(Handle<JSObject> object) {
Isolate* isolate = object->GetIsolate();
if (object->IsAccessCheckNeeded() &&
!isolate->MayAccess(handle(isolate->context()), object)) {
return true;
}
if (object->IsJSGlobalProxy()) {
PrototypeIterator iter(isolate, *object);
if (iter.IsAtEnd()) return false;
DCHECK(iter.GetCurrent()->IsJSGlobalObject());
return iter.GetCurrent<JSObject>()->map()->is_extensible();
}
return object->map()->is_extensible();
}
namespace {
template <typename Dictionary>
void DictionaryDetailsAtPut(Isolate* isolate, Handle<Dictionary> dictionary,
int entry, PropertyDetails details) {
dictionary->DetailsAtPut(entry, details);
}
template <>
void DictionaryDetailsAtPut<GlobalDictionary>(
Isolate* isolate, Handle<GlobalDictionary> dictionary, int entry,
PropertyDetails details) {
Object* value = dictionary->ValueAt(entry);
DCHECK(value->IsPropertyCell());
value = PropertyCell::cast(value)->value();
if (value->IsTheHole(isolate)) return;
PropertyCell::PrepareForValue(dictionary, entry, handle(value, isolate),
details);
}
template <typename Dictionary>
void ApplyAttributesToDictionary(Isolate* isolate,
Handle<Dictionary> dictionary,
const PropertyAttributes attributes) {
int capacity = dictionary->Capacity();
for (int i = 0; i < capacity; i++) {
Object* k = dictionary->KeyAt(i);
if (dictionary->IsKey(isolate, k) &&
!(k->IsSymbol() && Symbol::cast(k)->is_private())) {
PropertyDetails details = dictionary->DetailsAt(i);
int attrs = attributes;
// READ_ONLY is an invalid attribute for JS setters/getters.
if ((attributes & READ_ONLY) && details.kind() == kAccessor) {
Object* v = dictionary->ValueAt(i);
if (v->IsPropertyCell()) v = PropertyCell::cast(v)->value();
if (v->IsAccessorPair()) attrs &= ~READ_ONLY;
}
details = details.CopyAddAttributes(
static_cast<PropertyAttributes>(attrs));
DictionaryDetailsAtPut<Dictionary>(isolate, dictionary, i, details);
}
}
}
} // namespace
template <PropertyAttributes attrs>
Maybe<bool> JSObject::PreventExtensionsWithTransition(
Handle<JSObject> object, ShouldThrow should_throw) {
STATIC_ASSERT(attrs == NONE || attrs == SEALED || attrs == FROZEN);
// Sealing/freezing sloppy arguments should be handled elsewhere.
DCHECK(!object->HasSloppyArgumentsElements());
Isolate* isolate = object->GetIsolate();
if (object->IsAccessCheckNeeded() &&
!isolate->MayAccess(handle(isolate->context()), object)) {
isolate->ReportFailedAccessCheck(object);
RETURN_VALUE_IF_SCHEDULED_EXCEPTION(isolate, Nothing<bool>());
RETURN_FAILURE(isolate, should_throw,
NewTypeError(MessageTemplate::kNoAccess));
}
if (attrs == NONE && !object->map()->is_extensible()) return Just(true);
if (object->IsJSGlobalProxy()) {
PrototypeIterator iter(isolate, object);
if (iter.IsAtEnd()) return Just(true);
DCHECK(PrototypeIterator::GetCurrent(iter)->IsJSGlobalObject());
return PreventExtensionsWithTransition<attrs>(
PrototypeIterator::GetCurrent<JSObject>(iter), should_throw);
}
Handle<SeededNumberDictionary> new_element_dictionary;
if (!object->HasFixedTypedArrayElements() &&
!object->HasDictionaryElements() &&
!object->HasSlowStringWrapperElements()) {
int length =
object->IsJSArray()
? Smi::cast(Handle<JSArray>::cast(object)->length())->value()
: object->elements()->length();
new_element_dictionary =
length == 0 ? isolate->factory()->empty_slow_element_dictionary()
: object->GetElementsAccessor()->Normalize(object);
}
Handle<Symbol> transition_marker;
if (attrs == NONE) {
transition_marker = isolate->factory()->nonextensible_symbol();
} else if (attrs == SEALED) {
transition_marker = isolate->factory()->sealed_symbol();
} else {
DCHECK(attrs == FROZEN);
transition_marker = isolate->factory()->frozen_symbol();
}
Handle<Map> old_map(object->map(), isolate);
Map* transition =
TransitionArray::SearchSpecial(*old_map, *transition_marker);
if (transition != NULL) {
Handle<Map> transition_map(transition, isolate);
DCHECK(transition_map->has_dictionary_elements() ||
transition_map->has_fixed_typed_array_elements() ||
transition_map->elements_kind() == SLOW_STRING_WRAPPER_ELEMENTS);
DCHECK(!transition_map->is_extensible());
JSObject::MigrateToMap(object, transition_map);
} else if (TransitionArray::CanHaveMoreTransitions(old_map)) {
// Create a new descriptor array with the appropriate property attributes
Handle<Map> new_map = Map::CopyForPreventExtensions(
old_map, attrs, transition_marker, "CopyForPreventExtensions");
JSObject::MigrateToMap(object, new_map);
} else {
DCHECK(old_map->is_dictionary_map() || !old_map->is_prototype_map());
// Slow path: need to normalize properties for safety
NormalizeProperties(object, CLEAR_INOBJECT_PROPERTIES, 0,
"SlowPreventExtensions");
// Create a new map, since other objects with this map may be extensible.
// TODO(adamk): Extend the NormalizedMapCache to handle non-extensible maps.
Handle<Map> new_map =
Map::Copy(handle(object->map()), "SlowCopyForPreventExtensions");
new_map->set_is_extensible(false);
if (!new_element_dictionary.is_null()) {
ElementsKind new_kind =
IsStringWrapperElementsKind(old_map->elements_kind())
? SLOW_STRING_WRAPPER_ELEMENTS
: DICTIONARY_ELEMENTS;
new_map->set_elements_kind(new_kind);
}
JSObject::MigrateToMap(object, new_map);
if (attrs != NONE) {
if (object->IsJSGlobalObject()) {
Handle<GlobalDictionary> dictionary(object->global_dictionary(),
isolate);
ApplyAttributesToDictionary(isolate, dictionary, attrs);
} else {
Handle<NameDictionary> dictionary(object->property_dictionary(),
isolate);
ApplyAttributesToDictionary(isolate, dictionary, attrs);
}
}
}
// Both seal and preventExtensions always go through without modifications to
// typed array elements. Freeze works only if there are no actual elements.
if (object->HasFixedTypedArrayElements()) {
if (attrs == FROZEN &&
JSArrayBufferView::cast(*object)->byte_length()->Number() > 0) {
isolate->Throw(*isolate->factory()->NewTypeError(
MessageTemplate::kCannotFreezeArrayBufferView));
return Nothing<bool>();
}
return Just(true);
}
DCHECK(object->map()->has_dictionary_elements() ||
object->map()->elements_kind() == SLOW_STRING_WRAPPER_ELEMENTS);
if (!new_element_dictionary.is_null()) {
object->set_elements(*new_element_dictionary);
}
if (object->elements() != isolate->heap()->empty_slow_element_dictionary()) {
Handle<SeededNumberDictionary> dictionary(object->element_dictionary(),
isolate);
// Make sure we never go back to the fast case
object->RequireSlowElements(*dictionary);
if (attrs != NONE) {
ApplyAttributesToDictionary(isolate, dictionary, attrs);
}
}
return Just(true);
}
Handle<Object> JSObject::FastPropertyAt(Handle<JSObject> object,
Representation representation,
FieldIndex index) {
Isolate* isolate = object->GetIsolate();
if (object->IsUnboxedDoubleField(index)) {
double value = object->RawFastDoublePropertyAt(index);
return isolate->factory()->NewHeapNumber(value);
}
Handle<Object> raw_value(object->RawFastPropertyAt(index), isolate);
return Object::WrapForRead(isolate, raw_value, representation);
}
template <class ContextObject>
class JSObjectWalkVisitor {
public:
JSObjectWalkVisitor(ContextObject* site_context, bool copying,
JSObject::DeepCopyHints hints)
: site_context_(site_context),
copying_(copying),
hints_(hints) {}
MUST_USE_RESULT MaybeHandle<JSObject> StructureWalk(Handle<JSObject> object);
protected:
MUST_USE_RESULT inline MaybeHandle<JSObject> VisitElementOrProperty(
Handle<JSObject> object,
Handle<JSObject> value) {
Handle<AllocationSite> current_site = site_context()->EnterNewScope();
MaybeHandle<JSObject> copy_of_value = StructureWalk(value);
site_context()->ExitScope(current_site, value);
return copy_of_value;
}
inline ContextObject* site_context() { return site_context_; }
inline Isolate* isolate() { return site_context()->isolate(); }
inline bool copying() const { return copying_; }
private:
ContextObject* site_context_;
const bool copying_;
const JSObject::DeepCopyHints hints_;
};
template <class ContextObject>
MaybeHandle<JSObject> JSObjectWalkVisitor<ContextObject>::StructureWalk(
Handle<JSObject> object) {
Isolate* isolate = this->isolate();
bool copying = this->copying();
bool shallow = hints_ == JSObject::kObjectIsShallow;
if (!shallow) {
StackLimitCheck check(isolate);
if (check.HasOverflowed()) {
isolate->StackOverflow();
return MaybeHandle<JSObject>();
}
}
if (object->map()->is_deprecated()) {
JSObject::MigrateInstance(object);
}
Handle<JSObject> copy;
if (copying) {
// JSFunction objects are not allowed to be in normal boilerplates at all.
DCHECK(!object->IsJSFunction());
Handle<AllocationSite> site_to_pass;
if (site_context()->ShouldCreateMemento(object)) {
site_to_pass = site_context()->current();
}
copy = isolate->factory()->CopyJSObjectWithAllocationSite(
object, site_to_pass);
} else {
copy = object;
}
DCHECK(copying || copy.is_identical_to(object));
ElementsKind kind = copy->GetElementsKind();
if (copying && IsFastSmiOrObjectElementsKind(kind) &&
FixedArray::cast(copy->elements())->map() ==
isolate->heap()->fixed_cow_array_map()) {
isolate->counters()->cow_arrays_created_runtime()->Increment();
}
if (!shallow) {
HandleScope scope(isolate);
// Deep copy own properties.
if (copy->HasFastProperties()) {
Handle<DescriptorArray> descriptors(copy->map()->instance_descriptors());
int limit = copy->map()->NumberOfOwnDescriptors();
for (int i = 0; i < limit; i++) {
PropertyDetails details = descriptors->GetDetails(i);
if (details.location() != kField) continue;
DCHECK_EQ(kData, details.kind());
FieldIndex index = FieldIndex::ForDescriptor(copy->map(), i);
if (object->IsUnboxedDoubleField(index)) {
if (copying) {
// Ensure that all bits of the double value are preserved.
uint64_t value = object->RawFastDoublePropertyAsBitsAt(index);
copy->RawFastDoublePropertyAsBitsAtPut(index, value);
}
} else {
Handle<Object> value(object->RawFastPropertyAt(index), isolate);
if (value->IsJSObject()) {
ASSIGN_RETURN_ON_EXCEPTION(
isolate, value,
VisitElementOrProperty(copy, Handle<JSObject>::cast(value)),
JSObject);
if (copying) {
copy->FastPropertyAtPut(index, *value);
}
} else {
if (copying) {
Representation representation = details.representation();
value = Object::NewStorageFor(isolate, value, representation);
copy->FastPropertyAtPut(index, *value);
}
}
}
}
} else {
// Only deep copy fields from the object literal expression.
// In particular, don't try to copy the length attribute of
// an array.
PropertyFilter filter = static_cast<PropertyFilter>(
ONLY_WRITABLE | ONLY_ENUMERABLE | ONLY_CONFIGURABLE);
KeyAccumulator accumulator(isolate, KeyCollectionMode::kOwnOnly, filter);
accumulator.CollectOwnPropertyNames(copy, copy);
Handle<FixedArray> names = accumulator.GetKeys();
for (int i = 0; i < names->length(); i++) {
DCHECK(names->get(i)->IsName());
Handle<Name> name(Name::cast(names->get(i)));
Handle<Object> value =
JSObject::GetProperty(copy, name).ToHandleChecked();
if (value->IsJSObject()) {
Handle<JSObject> result;
ASSIGN_RETURN_ON_EXCEPTION(
isolate, result,
VisitElementOrProperty(copy, Handle<JSObject>::cast(value)),
JSObject);
if (copying) {
// Creating object copy for literals. No strict mode needed.
JSObject::SetProperty(copy, name, result, SLOPPY).Assert();
}
}
}
}
// Deep copy own elements.
switch (kind) {
case FAST_ELEMENTS:
case FAST_HOLEY_ELEMENTS: {
Handle<FixedArray> elements(FixedArray::cast(copy->elements()));
if (elements->map() == isolate->heap()->fixed_cow_array_map()) {
#ifdef DEBUG
for (int i = 0; i < elements->length(); i++) {
DCHECK(!elements->get(i)->IsJSObject());
}
#endif
} else {
for (int i = 0; i < elements->length(); i++) {
Handle<Object> value(elements->get(i), isolate);
if (value->IsJSObject()) {
Handle<JSObject> result;
ASSIGN_RETURN_ON_EXCEPTION(
isolate, result,
VisitElementOrProperty(copy, Handle<JSObject>::cast(value)),
JSObject);
if (copying) {
elements->set(i, *result);
}
}
}
}
break;
}
case DICTIONARY_ELEMENTS: {
Handle<SeededNumberDictionary> element_dictionary(
copy->element_dictionary());
int capacity = element_dictionary->Capacity();
for (int i = 0; i < capacity; i++) {
Object* k = element_dictionary->KeyAt(i);
if (element_dictionary->IsKey(isolate, k)) {
Handle<Object> value(element_dictionary->ValueAt(i), isolate);
if (value->IsJSObject()) {
Handle<JSObject> result;
ASSIGN_RETURN_ON_EXCEPTION(
isolate, result,
VisitElementOrProperty(copy, Handle<JSObject>::cast(value)),
JSObject);
if (copying) {
element_dictionary->ValueAtPut(i, *result);
}
}
}
}
break;
}
case FAST_SLOPPY_ARGUMENTS_ELEMENTS:
case SLOW_SLOPPY_ARGUMENTS_ELEMENTS:
UNIMPLEMENTED();
break;
case FAST_STRING_WRAPPER_ELEMENTS:
case SLOW_STRING_WRAPPER_ELEMENTS:
UNREACHABLE();
break;
#define TYPED_ARRAY_CASE(Type, type, TYPE, ctype, size) \
case TYPE##_ELEMENTS: \
TYPED_ARRAYS(TYPED_ARRAY_CASE)
#undef TYPED_ARRAY_CASE
// Typed elements cannot be created using an object literal.
UNREACHABLE();
break;
case FAST_SMI_ELEMENTS:
case FAST_HOLEY_SMI_ELEMENTS:
case FAST_DOUBLE_ELEMENTS:
case FAST_HOLEY_DOUBLE_ELEMENTS:
case NO_ELEMENTS:
// No contained objects, nothing to do.
break;
}
}
return copy;
}
MaybeHandle<JSObject> JSObject::DeepWalk(
Handle<JSObject> object,
AllocationSiteCreationContext* site_context) {
JSObjectWalkVisitor<AllocationSiteCreationContext> v(site_context, false,
kNoHints);
MaybeHandle<JSObject> result = v.StructureWalk(object);
Handle<JSObject> for_assert;
DCHECK(!result.ToHandle(&for_assert) || for_assert.is_identical_to(object));
return result;
}
MaybeHandle<JSObject> JSObject::DeepCopy(
Handle<JSObject> object,
AllocationSiteUsageContext* site_context,
DeepCopyHints hints) {
JSObjectWalkVisitor<AllocationSiteUsageContext> v(site_context, true, hints);
MaybeHandle<JSObject> copy = v.StructureWalk(object);
Handle<JSObject> for_assert;
DCHECK(!copy.ToHandle(&for_assert) || !for_assert.is_identical_to(object));
return copy;
}
// static
MaybeHandle<Object> JSReceiver::ToPrimitive(Handle<JSReceiver> receiver,
ToPrimitiveHint hint) {
Isolate* const isolate = receiver->GetIsolate();
Handle<Object> exotic_to_prim;
ASSIGN_RETURN_ON_EXCEPTION(
isolate, exotic_to_prim,
GetMethod(receiver, isolate->factory()->to_primitive_symbol()), Object);
if (!exotic_to_prim->IsUndefined(isolate)) {
Handle<Object> hint_string =
isolate->factory()->ToPrimitiveHintString(hint);
Handle<Object> result;
ASSIGN_RETURN_ON_EXCEPTION(
isolate, result,
Execution::Call(isolate, exotic_to_prim, receiver, 1, &hint_string),
Object);
if (result->IsPrimitive()) return result;
THROW_NEW_ERROR(isolate,
NewTypeError(MessageTemplate::kCannotConvertToPrimitive),
Object);
}
return OrdinaryToPrimitive(receiver, (hint == ToPrimitiveHint::kString)
? OrdinaryToPrimitiveHint::kString
: OrdinaryToPrimitiveHint::kNumber);
}
// static
MaybeHandle<Object> JSReceiver::OrdinaryToPrimitive(
Handle<JSReceiver> receiver, OrdinaryToPrimitiveHint hint) {
Isolate* const isolate = receiver->GetIsolate();
Handle<String> method_names[2];
switch (hint) {
case OrdinaryToPrimitiveHint::kNumber:
method_names[0] = isolate->factory()->valueOf_string();
method_names[1] = isolate->factory()->toString_string();
break;
case OrdinaryToPrimitiveHint::kString:
method_names[0] = isolate->factory()->toString_string();
method_names[1] = isolate->factory()->valueOf_string();
break;
}
for (Handle<String> name : method_names) {
Handle<Object> method;
ASSIGN_RETURN_ON_EXCEPTION(isolate, method,
JSReceiver::GetProperty(receiver, name), Object);
if (method->IsCallable()) {
Handle<Object> result;
ASSIGN_RETURN_ON_EXCEPTION(
isolate, result, Execution::Call(isolate, method, receiver, 0, NULL),
Object);
if (result->IsPrimitive()) return result;
}
}
THROW_NEW_ERROR(isolate,
NewTypeError(MessageTemplate::kCannotConvertToPrimitive),
Object);
}
// TODO(cbruni/jkummerow): Consider moving this into elements.cc.
bool JSObject::HasEnumerableElements() {
// TODO(cbruni): cleanup
JSObject* object = this;
switch (object->GetElementsKind()) {
case FAST_SMI_ELEMENTS:
case FAST_ELEMENTS:
case FAST_DOUBLE_ELEMENTS: {
int length = object->IsJSArray()
? Smi::cast(JSArray::cast(object)->length())->value()
: object->elements()->length();
return length > 0;
}
case FAST_HOLEY_SMI_ELEMENTS:
case FAST_HOLEY_ELEMENTS: {
FixedArray* elements = FixedArray::cast(object->elements());
int length = object->IsJSArray()
? Smi::cast(JSArray::cast(object)->length())->value()
: elements->length();
Isolate* isolate = GetIsolate();
for (int i = 0; i < length; i++) {
if (!elements->is_the_hole(isolate, i)) return true;
}
return false;
}
case FAST_HOLEY_DOUBLE_ELEMENTS: {
int length = object->IsJSArray()
? Smi::cast(JSArray::cast(object)->length())->value()
: object->elements()->length();
// Zero-length arrays would use the empty FixedArray...
if (length == 0) return false;
// ...so only cast to FixedDoubleArray otherwise.
FixedDoubleArray* elements = FixedDoubleArray::cast(object->elements());
for (int i = 0; i < length; i++) {
if (!elements->is_the_hole(i)) return true;
}
return false;
}
#define TYPED_ARRAY_CASE(Type, type, TYPE, ctype, size) \
case TYPE##_ELEMENTS:
TYPED_ARRAYS(TYPED_ARRAY_CASE)
#undef TYPED_ARRAY_CASE
{
int length = object->elements()->length();
return length > 0;
}
case DICTIONARY_ELEMENTS: {
SeededNumberDictionary* elements =
SeededNumberDictionary::cast(object->elements());
return elements->NumberOfElementsFilterAttributes(ONLY_ENUMERABLE) > 0;
}
case FAST_SLOPPY_ARGUMENTS_ELEMENTS:
case SLOW_SLOPPY_ARGUMENTS_ELEMENTS:
// We're approximating non-empty arguments objects here.
return true;
case FAST_STRING_WRAPPER_ELEMENTS:
case SLOW_STRING_WRAPPER_ELEMENTS:
if (String::cast(JSValue::cast(object)->value())->length() > 0) {
return true;
}
return object->elements()->length() > 0;
case NO_ELEMENTS:
return false;
}
UNREACHABLE();
return true;
}
int Map::NumberOfDescribedProperties(DescriptorFlag which,
PropertyFilter filter) {
int result = 0;
DescriptorArray* descs = instance_descriptors();
int limit = which == ALL_DESCRIPTORS
? descs->number_of_descriptors()
: NumberOfOwnDescriptors();
for (int i = 0; i < limit; i++) {
if ((descs->GetDetails(i).attributes() & filter) == 0 &&
!descs->GetKey(i)->FilterKey(filter)) {
result++;
}
}
return result;
}
int Map::NextFreePropertyIndex() {
int free_index = 0;
int number_of_own_descriptors = NumberOfOwnDescriptors();
DescriptorArray* descs = instance_descriptors();
for (int i = 0; i < number_of_own_descriptors; i++) {
PropertyDetails details = descs->GetDetails(i);
if (details.location() == kField) {
int candidate = details.field_index() + details.field_width_in_words();
if (candidate > free_index) free_index = candidate;
}
}
return free_index;
}
bool Map::OnlyHasSimpleProperties() {
// Wrapped string elements aren't explicitly stored in the elements backing
// store, but are loaded indirectly from the underlying string.
return !IsStringWrapperElementsKind(elements_kind()) &&
!IsSpecialReceiverMap() && !has_hidden_prototype() &&
!is_dictionary_map();
}
MUST_USE_RESULT Maybe<bool> FastGetOwnValuesOrEntries(
Isolate* isolate, Handle<JSReceiver> receiver, bool get_entries,
Handle<FixedArray>* result) {
Handle<Map> map(JSReceiver::cast(*receiver)->map(), isolate);
if (!map->IsJSObjectMap()) return Just(false);
if (!map->OnlyHasSimpleProperties()) return Just(false);
Handle<JSObject> object(JSObject::cast(*receiver));
Handle<DescriptorArray> descriptors(map->instance_descriptors(), isolate);
int number_of_own_descriptors = map->NumberOfOwnDescriptors();
int number_of_own_elements =
object->GetElementsAccessor()->GetCapacity(*object, object->elements());
Handle<FixedArray> values_or_entries = isolate->factory()->NewFixedArray(
number_of_own_descriptors + number_of_own_elements);
int count = 0;
if (object->elements() != isolate->heap()->empty_fixed_array()) {
MAYBE_RETURN(object->GetElementsAccessor()->CollectValuesOrEntries(
isolate, object, values_or_entries, get_entries, &count,
ENUMERABLE_STRINGS),
Nothing<bool>());
}
bool stable = object->map() == *map;
for (int index = 0; index < number_of_own_descriptors; index++) {
Handle<Name> next_key(descriptors->GetKey(index), isolate);
if (!next_key->IsString()) continue;
Handle<Object> prop_value;
// Directly decode from the descriptor array if |from| did not change shape.
if (stable) {
PropertyDetails details = descriptors->GetDetails(index);
if (!details.IsEnumerable()) continue;
if (details.kind() == kData) {
if (details.location() == kDescriptor) {
prop_value = handle(descriptors->GetValue(index), isolate);
} else {
Representation representation = details.representation();
FieldIndex field_index = FieldIndex::ForDescriptor(*map, index);
prop_value =
JSObject::FastPropertyAt(object, representation, field_index);
}
} else {
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
isolate, prop_value, JSReceiver::GetProperty(object, next_key),
Nothing<bool>());
stable = object->map() == *map;
}
} else {
// If the map did change, do a slower lookup. We are still guaranteed that
// the object has a simple shape, and that the key is a name.
LookupIterator it(object, next_key, LookupIterator::OWN_SKIP_INTERCEPTOR);
if (!it.IsFound()) continue;
DCHECK(it.state() == LookupIterator::DATA ||
it.state() == LookupIterator::ACCESSOR);
if (!it.IsEnumerable()) continue;
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
isolate, prop_value, Object::GetProperty(&it), Nothing<bool>());
}
if (get_entries) {
prop_value = MakeEntryPair(isolate, next_key, prop_value);
}
values_or_entries->set(count, *prop_value);
count++;
}
if (count < values_or_entries->length()) values_or_entries->Shrink(count);
*result = values_or_entries;
return Just(true);
}
MaybeHandle<FixedArray> GetOwnValuesOrEntries(Isolate* isolate,
Handle<JSReceiver> object,
PropertyFilter filter,
bool get_entries) {
Handle<FixedArray> values_or_entries;
if (filter == ENUMERABLE_STRINGS) {
Maybe<bool> fast_values_or_entries = FastGetOwnValuesOrEntries(
isolate, object, get_entries, &values_or_entries);
if (fast_values_or_entries.IsNothing()) return MaybeHandle<FixedArray>();
if (fast_values_or_entries.FromJust()) return values_or_entries;
}
PropertyFilter key_filter =
static_cast<PropertyFilter>(filter & ~ONLY_ENUMERABLE);
Handle<FixedArray> keys;
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
isolate, keys,
KeyAccumulator::GetKeys(object, KeyCollectionMode::kOwnOnly, key_filter,
GetKeysConversion::kConvertToString),
MaybeHandle<FixedArray>());
values_or_entries = isolate->factory()->NewFixedArray(keys->length());
int length = 0;
for (int i = 0; i < keys->length(); ++i) {
Handle<Name> key = Handle<Name>::cast(handle(keys->get(i), isolate));
if (filter & ONLY_ENUMERABLE) {
PropertyDescriptor descriptor;
Maybe<bool> did_get_descriptor = JSReceiver::GetOwnPropertyDescriptor(
isolate, object, key, &descriptor);
MAYBE_RETURN(did_get_descriptor, MaybeHandle<FixedArray>());
if (!did_get_descriptor.FromJust() || !descriptor.enumerable()) continue;
}
Handle<Object> value;
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
isolate, value, JSReceiver::GetPropertyOrElement(object, key),
MaybeHandle<FixedArray>());
if (get_entries) {
Handle<FixedArray> entry_storage =
isolate->factory()->NewUninitializedFixedArray(2);
entry_storage->set(0, *key);
entry_storage->set(1, *value);
value = isolate->factory()->NewJSArrayWithElements(entry_storage,
FAST_ELEMENTS, 2);
}
values_or_entries->set(length, *value);
length++;
}
if (length < values_or_entries->length()) values_or_entries->Shrink(length);
return values_or_entries;
}
MaybeHandle<FixedArray> JSReceiver::GetOwnValues(Handle<JSReceiver> object,
PropertyFilter filter) {
return GetOwnValuesOrEntries(object->GetIsolate(), object, filter, false);
}
MaybeHandle<FixedArray> JSReceiver::GetOwnEntries(Handle<JSReceiver> object,
PropertyFilter filter) {
return GetOwnValuesOrEntries(object->GetIsolate(), object, filter, true);
}
bool Map::DictionaryElementsInPrototypeChainOnly() {
if (IsDictionaryElementsKind(elements_kind())) {
return false;
}
for (PrototypeIterator iter(this); !iter.IsAtEnd(); iter.Advance()) {
// Be conservative, don't walk into proxies.
if (iter.GetCurrent()->IsJSProxy()) return true;
// String wrappers have non-configurable, non-writable elements.
if (iter.GetCurrent()->IsStringWrapper()) return true;
JSObject* current = iter.GetCurrent<JSObject>();
if (current->HasDictionaryElements() &&
current->element_dictionary()->requires_slow_elements()) {
return true;
}
if (current->HasSlowArgumentsElements()) {
FixedArray* parameter_map = FixedArray::cast(current->elements());
Object* arguments = parameter_map->get(1);
if (SeededNumberDictionary::cast(arguments)->requires_slow_elements()) {
return true;
}
}
}
return false;
}
MaybeHandle<Object> JSObject::DefineAccessor(Handle<JSObject> object,
Handle<Name> name,
Handle<Object> getter,
Handle<Object> setter,
PropertyAttributes attributes) {
Isolate* isolate = object->GetIsolate();
LookupIterator it = LookupIterator::PropertyOrElement(
isolate, object, name, LookupIterator::OWN_SKIP_INTERCEPTOR);
return DefineAccessor(&it, getter, setter, attributes);
}
MaybeHandle<Object> JSObject::DefineAccessor(LookupIterator* it,
Handle<Object> getter,
Handle<Object> setter,
PropertyAttributes attributes) {
Isolate* isolate = it->isolate();
it->UpdateProtector();
if (it->state() == LookupIterator::ACCESS_CHECK) {
if (!it->HasAccess()) {
isolate->ReportFailedAccessCheck(it->GetHolder<JSObject>());
RETURN_EXCEPTION_IF_SCHEDULED_EXCEPTION(isolate, Object);
return isolate->factory()->undefined_value();
}
it->Next();
}
Handle<JSObject> object = Handle<JSObject>::cast(it->GetReceiver());
// Ignore accessors on typed arrays.
if (it->IsElement() && object->HasFixedTypedArrayElements()) {
return it->factory()->undefined_value();
}
DCHECK(getter->IsCallable() || getter->IsUndefined(isolate) ||
getter->IsNull(isolate) || getter->IsFunctionTemplateInfo());
DCHECK(setter->IsCallable() || setter->IsUndefined(isolate) ||
setter->IsNull(isolate) || setter->IsFunctionTemplateInfo());
it->TransitionToAccessorProperty(getter, setter, attributes);
return isolate->factory()->undefined_value();
}
MaybeHandle<Object> JSObject::SetAccessor(Handle<JSObject> object,
Handle<AccessorInfo> info) {
Isolate* isolate = object->GetIsolate();
Handle<Name> name(Name::cast(info->name()), isolate);
LookupIterator it = LookupIterator::PropertyOrElement(
isolate, object, name, LookupIterator::OWN_SKIP_INTERCEPTOR);
// Duplicate ACCESS_CHECK outside of GetPropertyAttributes for the case that
// the FailedAccessCheckCallbackFunction doesn't throw an exception.
//
// TODO(verwaest): Force throw an exception if the callback doesn't, so we can
// remove reliance on default return values.
if (it.state() == LookupIterator::ACCESS_CHECK) {
if (!it.HasAccess()) {
isolate->ReportFailedAccessCheck(object);
RETURN_EXCEPTION_IF_SCHEDULED_EXCEPTION(isolate, Object);
return it.factory()->undefined_value();
}
it.Next();
}
// Ignore accessors on typed arrays.
if (it.IsElement() && object->HasFixedTypedArrayElements()) {
return it.factory()->undefined_value();
}
CHECK(GetPropertyAttributes(&it).IsJust());
// ES5 forbids turning a property into an accessor if it's not
// configurable. See 8.6.1 (Table 5).
if (it.IsFound() && !it.IsConfigurable()) {
return it.factory()->undefined_value();
}
it.TransitionToAccessorPair(info, info->property_attributes());
return object;
}
Object* JSObject::SlowReverseLookup(Object* value) {
if (HasFastProperties()) {
int number_of_own_descriptors = map()->NumberOfOwnDescriptors();
DescriptorArray* descs = map()->instance_descriptors();
bool value_is_number = value->IsNumber();
for (int i = 0; i < number_of_own_descriptors; i++) {
PropertyDetails details = descs->GetDetails(i);
if (details.location() == kField) {
DCHECK_EQ(kData, details.kind());
FieldIndex field_index = FieldIndex::ForDescriptor(map(), i);
if (IsUnboxedDoubleField(field_index)) {
if (value_is_number) {
double property = RawFastDoublePropertyAt(field_index);
if (property == value->Number()) {
return descs->GetKey(i);
}
}
} else {
Object* property = RawFastPropertyAt(field_index);
if (field_index.is_double()) {
DCHECK(property->IsMutableHeapNumber());
if (value_is_number && property->Number() == value->Number()) {
return descs->GetKey(i);
}
} else if (property == value) {
return descs->GetKey(i);
}
}
} else {
DCHECK_EQ(kDescriptor, details.location());
if (details.kind() == kData) {
if (descs->GetValue(i) == value) {
return descs->GetKey(i);
}
}
}
}
return GetHeap()->undefined_value();
} else if (IsJSGlobalObject()) {
return global_dictionary()->SlowReverseLookup(value);
} else {
return property_dictionary()->SlowReverseLookup(value);
}
}
Handle<Map> Map::RawCopy(Handle<Map> map, int instance_size) {
Isolate* isolate = map->GetIsolate();
Handle<Map> result =
isolate->factory()->NewMap(map->instance_type(), instance_size);
Handle<Object> prototype(map->prototype(), isolate);
Map::SetPrototype(result, prototype);
result->set_constructor_or_backpointer(map->GetConstructor());
result->set_bit_field(map->bit_field());
result->set_bit_field2(map->bit_field2());
int new_bit_field3 = map->bit_field3();
new_bit_field3 = OwnsDescriptors::update(new_bit_field3, true);
new_bit_field3 = NumberOfOwnDescriptorsBits::update(new_bit_field3, 0);
new_bit_field3 = EnumLengthBits::update(new_bit_field3,
kInvalidEnumCacheSentinel);
new_bit_field3 = Deprecated::update(new_bit_field3, false);
if (!map->is_dictionary_map()) {
new_bit_field3 = IsUnstable::update(new_bit_field3, false);
}
result->set_bit_field3(new_bit_field3);
return result;
}
Handle<Map> Map::Normalize(Handle<Map> fast_map, PropertyNormalizationMode mode,
const char* reason) {
DCHECK(!fast_map->is_dictionary_map());
Isolate* isolate = fast_map->GetIsolate();
Handle<Object> maybe_cache(isolate->native_context()->normalized_map_cache(),
isolate);
bool use_cache =
!fast_map->is_prototype_map() && !maybe_cache->IsUndefined(isolate);
Handle<NormalizedMapCache> cache;
if (use_cache) cache = Handle<NormalizedMapCache>::cast(maybe_cache);
Handle<Map> new_map;
if (use_cache && cache->Get(fast_map, mode).ToHandle(&new_map)) {
#ifdef VERIFY_HEAP
if (FLAG_verify_heap) new_map->DictionaryMapVerify();
#endif
#ifdef ENABLE_SLOW_DCHECKS
if (FLAG_enable_slow_asserts) {
// The cached map should match newly created normalized map bit-by-bit,
// except for the code cache, which can contain some ics which can be
// applied to the shared map, dependent code and weak cell cache.
Handle<Map> fresh = Map::CopyNormalized(fast_map, mode);
if (new_map->is_prototype_map()) {
// For prototype maps, the PrototypeInfo is not copied.
DCHECK(memcmp(fresh->address(), new_map->address(),
kTransitionsOrPrototypeInfoOffset) == 0);
DCHECK(fresh->raw_transitions() == Smi::kZero);
STATIC_ASSERT(kDescriptorsOffset ==
kTransitionsOrPrototypeInfoOffset + kPointerSize);
DCHECK(memcmp(HeapObject::RawField(*fresh, kDescriptorsOffset),
HeapObject::RawField(*new_map, kDescriptorsOffset),
kCodeCacheOffset - kDescriptorsOffset) == 0);
} else {
DCHECK(memcmp(fresh->address(), new_map->address(),
Map::kCodeCacheOffset) == 0);
}
STATIC_ASSERT(Map::kDependentCodeOffset ==
Map::kCodeCacheOffset + kPointerSize);
STATIC_ASSERT(Map::kWeakCellCacheOffset ==
Map::kDependentCodeOffset + kPointerSize);
int offset = Map::kWeakCellCacheOffset + kPointerSize;
DCHECK(memcmp(fresh->address() + offset,
new_map->address() + offset,
Map::kSize - offset) == 0);
}
#endif
} else {
new_map = Map::CopyNormalized(fast_map, mode);
if (use_cache) {
cache->Set(fast_map, new_map);
isolate->counters()->maps_normalized()->Increment();
}
#if TRACE_MAPS
if (FLAG_trace_maps) {
PrintF("[TraceMaps: Normalize from= %p to= %p reason= %s ]\n",
reinterpret_cast<void*>(*fast_map),
reinterpret_cast<void*>(*new_map), reason);
}
#endif
}
fast_map->NotifyLeafMapLayoutChange();
return new_map;
}
Handle<Map> Map::CopyNormalized(Handle<Map> map,
PropertyNormalizationMode mode) {
int new_instance_size = map->instance_size();
if (mode == CLEAR_INOBJECT_PROPERTIES) {
new_instance_size -= map->GetInObjectProperties() * kPointerSize;
}
Handle<Map> result = RawCopy(map, new_instance_size);
if (mode != CLEAR_INOBJECT_PROPERTIES) {
result->SetInObjectProperties(map->GetInObjectProperties());
}
result->set_dictionary_map(true);
result->set_migration_target(false);
result->set_construction_counter(kNoSlackTracking);
#ifdef VERIFY_HEAP
if (FLAG_verify_heap) result->DictionaryMapVerify();
#endif
return result;
}
// Return an immutable prototype exotic object version of the input map.
// Never even try to cache it in the transition tree, as it is intended
// for the global object and its prototype chain, and excluding it saves
// memory on the map transition tree.
// static
Handle<Map> Map::TransitionToImmutableProto(Handle<Map> map) {
Handle<Map> new_map = Map::Copy(map, "ImmutablePrototype");
new_map->set_immutable_proto(true);
return new_map;
}
Handle<Map> Map::CopyInitialMap(Handle<Map> map, int instance_size,
int in_object_properties,
int unused_property_fields) {
#ifdef DEBUG
Isolate* isolate = map->GetIsolate();
// Strict function maps have Function as a constructor but the
// Function's initial map is a sloppy function map. Same holds for
// GeneratorFunction / AsyncFunction and its initial map.
Object* constructor = map->GetConstructor();
DCHECK(constructor->IsJSFunction());
DCHECK(*map == JSFunction::cast(constructor)->initial_map() ||
*map == *isolate->strict_function_map() ||
*map == *isolate->generator_function_map() ||
*map == *isolate->async_function_map());
#endif
// Initial maps must always own their descriptors and it's descriptor array
// does not contain descriptors that do not belong to the map.
DCHECK(map->owns_descriptors());
DCHECK_EQ(map->NumberOfOwnDescriptors(),
map->instance_descriptors()->number_of_descriptors());
Handle<Map> result = RawCopy(map, instance_size);
// Please note instance_type and instance_size are set when allocated.
result->SetInObjectProperties(in_object_properties);
result->set_unused_property_fields(unused_property_fields);
int number_of_own_descriptors = map->NumberOfOwnDescriptors();
if (number_of_own_descriptors > 0) {
// The copy will use the same descriptors array.
result->UpdateDescriptors(map->instance_descriptors(),
map->GetLayoutDescriptor());
result->SetNumberOfOwnDescriptors(number_of_own_descriptors);
DCHECK_EQ(result->NumberOfFields(),
in_object_properties - unused_property_fields);
}
return result;
}
Handle<Map> Map::CopyDropDescriptors(Handle<Map> map) {
Handle<Map> result = RawCopy(map, map->instance_size());
// Please note instance_type and instance_size are set when allocated.
if (map->IsJSObjectMap()) {
result->SetInObjectProperties(map->GetInObjectProperties());
result->set_unused_property_fields(map->unused_property_fields());
}
result->ClearCodeCache(map->GetHeap());
map->NotifyLeafMapLayoutChange();
return result;
}
Handle<Map> Map::ShareDescriptor(Handle<Map> map,
Handle<DescriptorArray> descriptors,
Descriptor* descriptor) {
// Sanity check. This path is only to be taken if the map owns its descriptor
// array, implying that its NumberOfOwnDescriptors equals the number of
// descriptors in the descriptor array.
DCHECK_EQ(map->NumberOfOwnDescriptors(),
map->instance_descriptors()->number_of_descriptors());
Handle<Map> result = CopyDropDescriptors(map);
Handle<Name> name = descriptor->GetKey();
// Ensure there's space for the new descriptor in the shared descriptor array.
if (descriptors->NumberOfSlackDescriptors() == 0) {
int old_size = descriptors->number_of_descriptors();
if (old_size == 0) {
descriptors = DescriptorArray::Allocate(map->GetIsolate(), 0, 1);
} else {
int slack = SlackForArraySize(old_size, kMaxNumberOfDescriptors);
EnsureDescriptorSlack(map, slack);
descriptors = handle(map->instance_descriptors());
}
}
Handle<LayoutDescriptor> layout_descriptor =
FLAG_unbox_double_fields
? LayoutDescriptor::ShareAppend(map, descriptor->GetDetails())
: handle(LayoutDescriptor::FastPointerLayout(), map->GetIsolate());
{
DisallowHeapAllocation no_gc;
descriptors->Append(descriptor);
result->InitializeDescriptors(*descriptors, *layout_descriptor);
}
DCHECK(result->NumberOfOwnDescriptors() == map->NumberOfOwnDescriptors() + 1);
ConnectTransition(map, result, name, SIMPLE_PROPERTY_TRANSITION);
return result;
}
#if TRACE_MAPS
// static
void Map::TraceTransition(const char* what, Map* from, Map* to, Name* name) {
if (FLAG_trace_maps) {
PrintF("[TraceMaps: %s from= %p to= %p name= ", what,
reinterpret_cast<void*>(from), reinterpret_cast<void*>(to));
name->NameShortPrint();
PrintF(" ]\n");
}
}
// static
void Map::TraceAllTransitions(Map* map) {
Object* transitions = map->raw_transitions();
int num_transitions = TransitionArray::NumberOfTransitions(transitions);
for (int i = -0; i < num_transitions; ++i) {
Map* target = TransitionArray::GetTarget(transitions, i);
Name* key = TransitionArray::GetKey(transitions, i);
Map::TraceTransition("Transition", map, target, key);
Map::TraceAllTransitions(target);
}
}
#endif // TRACE_MAPS
void Map::ConnectTransition(Handle<Map> parent, Handle<Map> child,
Handle<Name> name, SimpleTransitionFlag flag) {
if (!parent->GetBackPointer()->IsUndefined(parent->GetIsolate())) {
parent->set_owns_descriptors(false);
} else {
// |parent| is initial map and it must keep the ownership, there must be no
// descriptors in the descriptors array that do not belong to the map.
DCHECK(parent->owns_descriptors());
DCHECK_EQ(parent->NumberOfOwnDescriptors(),
parent->instance_descriptors()->number_of_descriptors());
}
if (parent->is_prototype_map()) {
DCHECK(child->is_prototype_map());
#if TRACE_MAPS
Map::TraceTransition("NoTransition", *parent, *child, *name);
#endif
} else {
TransitionArray::Insert(parent, name, child, flag);
#if TRACE_MAPS
Map::TraceTransition("Transition", *parent, *child, *name);
#endif
}
}
Handle<Map> Map::CopyReplaceDescriptors(
Handle<Map> map, Handle<DescriptorArray> descriptors,
Handle<LayoutDescriptor> layout_descriptor, TransitionFlag flag,
MaybeHandle<Name> maybe_name, const char* reason,
SimpleTransitionFlag simple_flag) {
DCHECK(descriptors->IsSortedNoDuplicates());
Handle<Map> result = CopyDropDescriptors(map);
if (!map->is_prototype_map()) {
if (flag == INSERT_TRANSITION &&
TransitionArray::CanHaveMoreTransitions(map)) {
result->InitializeDescriptors(*descriptors, *layout_descriptor);
Handle<Name> name;
CHECK(maybe_name.ToHandle(&name));
ConnectTransition(map, result, name, simple_flag);
} else {
descriptors->GeneralizeAllFields();
result->InitializeDescriptors(*descriptors,
LayoutDescriptor::FastPointerLayout());
}
} else {
result->InitializeDescriptors(*descriptors, *layout_descriptor);
}
#if TRACE_MAPS
if (FLAG_trace_maps &&
// Mirror conditions above that did not call ConnectTransition().
(map->is_prototype_map() ||
!(flag == INSERT_TRANSITION &&
TransitionArray::CanHaveMoreTransitions(map)))) {
PrintF("[TraceMaps: ReplaceDescriptors from= %p to= %p reason= %s ]\n",
reinterpret_cast<void*>(*map), reinterpret_cast<void*>(*result),
reason);
}
#endif
return result;
}
// Creates transition tree starting from |split_map| and adding all descriptors
// starting from descriptor with index |split_map|.NumberOfOwnDescriptors().
// The way how it is done is tricky because of GC and special descriptors
// marking logic.
Handle<Map> Map::AddMissingTransitions(
Handle<Map> split_map, Handle<DescriptorArray> descriptors,
Handle<LayoutDescriptor> full_layout_descriptor) {
DCHECK(descriptors->IsSortedNoDuplicates());
int split_nof = split_map->NumberOfOwnDescriptors();
int nof_descriptors = descriptors->number_of_descriptors();
DCHECK_LT(split_nof, nof_descriptors);
// Start with creating last map which will own full descriptors array.
// This is necessary to guarantee that GC will mark the whole descriptor
// array if any of the allocations happening below fail.
// Number of unused properties is temporarily incorrect and the layout
// descriptor could unnecessarily be in slow mode but we will fix after
// all the other intermediate maps are created.
Handle<Map> last_map = CopyDropDescriptors(split_map);
last_map->InitializeDescriptors(*descriptors, *full_layout_descriptor);
last_map->set_unused_property_fields(0);
// During creation of intermediate maps we violate descriptors sharing
// invariant since the last map is not yet connected to the transition tree
// we create here. But it is safe because GC never trims map's descriptors
// if there are no dead transitions from that map and this is exactly the
// case for all the intermediate maps we create here.
Handle<Map> map = split_map;
for (int i = split_nof; i < nof_descriptors - 1; ++i) {
Handle<Map> new_map = CopyDropDescriptors(map);
InstallDescriptors(map, new_map, i, descriptors, full_layout_descriptor);
map = new_map;
}
map->NotifyLeafMapLayoutChange();
InstallDescriptors(map, last_map, nof_descriptors - 1, descriptors,
full_layout_descriptor);
return last_map;
}
// Since this method is used to rewrite an existing transition tree, it can
// always insert transitions without checking.
void Map::InstallDescriptors(Handle<Map> parent, Handle<Map> child,
int new_descriptor,
Handle<DescriptorArray> descriptors,
Handle<LayoutDescriptor> full_layout_descriptor) {
DCHECK(descriptors->IsSortedNoDuplicates());
child->set_instance_descriptors(*descriptors);
child->SetNumberOfOwnDescriptors(new_descriptor + 1);
int unused_property_fields = parent->unused_property_fields();
PropertyDetails details = descriptors->GetDetails(new_descriptor);
if (details.location() == kField) {
unused_property_fields = parent->unused_property_fields() - 1;
if (unused_property_fields < 0) {
unused_property_fields += JSObject::kFieldsAdded;
}
}
child->set_unused_property_fields(unused_property_fields);
if (FLAG_unbox_double_fields) {
Handle<LayoutDescriptor> layout_descriptor =
LayoutDescriptor::AppendIfFastOrUseFull(parent, details,
full_layout_descriptor);
child->set_layout_descriptor(*layout_descriptor);
#ifdef VERIFY_HEAP
// TODO(ishell): remove these checks from VERIFY_HEAP mode.
if (FLAG_verify_heap) {
CHECK(child->layout_descriptor()->IsConsistentWithMap(*child));
}
#else
SLOW_DCHECK(child->layout_descriptor()->IsConsistentWithMap(*child));
#endif
child->set_visitor_id(Heap::GetStaticVisitorIdForMap(*child));
}
Handle<Name> name = handle(descriptors->GetKey(new_descriptor));
ConnectTransition(parent, child, name, SIMPLE_PROPERTY_TRANSITION);
}
Handle<Map> Map::CopyAsElementsKind(Handle<Map> map, ElementsKind kind,
TransitionFlag flag) {
Map* maybe_elements_transition_map = NULL;
if (flag == INSERT_TRANSITION) {
// Ensure we are requested to add elements kind transition "near the root".
DCHECK_EQ(map->FindRootMap()->NumberOfOwnDescriptors(),
map->NumberOfOwnDescriptors());
maybe_elements_transition_map = map->ElementsTransitionMap();
DCHECK(maybe_elements_transition_map == NULL ||
(maybe_elements_transition_map->elements_kind() ==
DICTIONARY_ELEMENTS &&
kind == DICTIONARY_ELEMENTS));
DCHECK(!IsFastElementsKind(kind) ||
IsMoreGeneralElementsKindTransition(map->elements_kind(), kind));
DCHECK(kind != map->elements_kind());
}
bool insert_transition = flag == INSERT_TRANSITION &&
TransitionArray::CanHaveMoreTransitions(map) &&
maybe_elements_transition_map == NULL;
if (insert_transition) {
Handle<Map> new_map = CopyForTransition(map, "CopyAsElementsKind");
new_map->set_elements_kind(kind);
Isolate* isolate = map->GetIsolate();
Handle<Name> name = isolate->factory()->elements_transition_symbol();
ConnectTransition(map, new_map, name, SPECIAL_TRANSITION);
return new_map;
}
// Create a new free-floating map only if we are not allowed to store it.
Handle<Map> new_map = Copy(map, "CopyAsElementsKind");
new_map->set_elements_kind(kind);
return new_map;
}
Handle<Map> Map::AsLanguageMode(Handle<Map> initial_map,
LanguageMode language_mode, FunctionKind kind) {
DCHECK_EQ(JS_FUNCTION_TYPE, initial_map->instance_type());
// Initial map for sloppy mode function is stored in the function
// constructor. Initial maps for strict mode are cached as special transitions
// using |strict_function_transition_symbol| as a key.
if (language_mode == SLOPPY) return initial_map;
Isolate* isolate = initial_map->GetIsolate();
int map_index = Context::FunctionMapIndex(language_mode, kind);
Handle<Map> function_map(
Map::cast(isolate->native_context()->get(map_index)));
STATIC_ASSERT(LANGUAGE_END == 2);
DCHECK_EQ(STRICT, language_mode);
Handle<Symbol> transition_symbol =
isolate->factory()->strict_function_transition_symbol();
Map* maybe_transition =
TransitionArray::SearchSpecial(*initial_map, *transition_symbol);
if (maybe_transition != NULL) {
return handle(maybe_transition, isolate);
}
initial_map->NotifyLeafMapLayoutChange();
// Create new map taking descriptors from the |function_map| and all
// the other details from the |initial_map|.
Handle<Map> map =
Map::CopyInitialMap(function_map, initial_map->instance_size(),
initial_map->GetInObjectProperties(),
initial_map->unused_property_fields());
map->SetConstructor(initial_map->GetConstructor());
map->set_prototype(initial_map->prototype());
if (TransitionArray::CanHaveMoreTransitions(initial_map)) {
Map::ConnectTransition(initial_map, map, transition_symbol,
SPECIAL_TRANSITION);
}
return map;
}
Handle<Map> Map::CopyForTransition(Handle<Map> map, const char* reason) {
DCHECK(!map->is_prototype_map());
Handle<Map> new_map = CopyDropDescriptors(map);
if (map->owns_descriptors()) {
// In case the map owned its own descriptors, share the descriptors and
// transfer ownership to the new map.
// The properties did not change, so reuse descriptors.
new_map->InitializeDescriptors(map->instance_descriptors(),
map->GetLayoutDescriptor());
} else {
// In case the map did not own its own descriptors, a split is forced by
// copying the map; creating a new descriptor array cell.
Handle<DescriptorArray> descriptors(map->instance_descriptors());
int number_of_own_descriptors = map->NumberOfOwnDescriptors();
Handle<DescriptorArray> new_descriptors =
DescriptorArray::CopyUpTo(descriptors, number_of_own_descriptors);
Handle<LayoutDescriptor> new_layout_descriptor(map->GetLayoutDescriptor(),
map->GetIsolate());
new_map->InitializeDescriptors(*new_descriptors, *new_layout_descriptor);
}
#if TRACE_MAPS
if (FLAG_trace_maps) {
PrintF("[TraceMaps: CopyForTransition from= %p to= %p reason= %s ]\n",
reinterpret_cast<void*>(*map), reinterpret_cast<void*>(*new_map),
reason);
}
#endif
return new_map;
}
Handle<Map> Map::Copy(Handle<Map> map, const char* reason) {
Handle<DescriptorArray> descriptors(map->instance_descriptors());
int number_of_own_descriptors = map->NumberOfOwnDescriptors();
Handle<DescriptorArray> new_descriptors =
DescriptorArray::CopyUpTo(descriptors, number_of_own_descriptors);
Handle<LayoutDescriptor> new_layout_descriptor(map->GetLayoutDescriptor(),
map->GetIsolate());
return CopyReplaceDescriptors(map, new_descriptors, new_layout_descriptor,
OMIT_TRANSITION, MaybeHandle<Name>(), reason,
SPECIAL_TRANSITION);
}
Handle<Map> Map::Create(Isolate* isolate, int inobject_properties) {
Handle<Map> copy =
Copy(handle(isolate->object_function()->initial_map()), "MapCreate");
// Check that we do not overflow the instance size when adding the extra
// inobject properties. If the instance size overflows, we allocate as many
// properties as we can as inobject properties.
int max_extra_properties =
(JSObject::kMaxInstanceSize - JSObject::kHeaderSize) >> kPointerSizeLog2;
if (inobject_properties > max_extra_properties) {
inobject_properties = max_extra_properties;
}
int new_instance_size =
JSObject::kHeaderSize + kPointerSize * inobject_properties;
// Adjust the map with the extra inobject properties.
copy->SetInObjectProperties(inobject_properties);
copy->set_unused_property_fields(inobject_properties);
copy->set_instance_size(new_instance_size);
copy->set_visitor_id(Heap::GetStaticVisitorIdForMap(*copy));
return copy;
}
Handle<Map> Map::CopyForPreventExtensions(Handle<Map> map,
PropertyAttributes attrs_to_add,
Handle<Symbol> transition_marker,
const char* reason) {
int num_descriptors = map->NumberOfOwnDescriptors();
Isolate* isolate = map->GetIsolate();
Handle<DescriptorArray> new_desc = DescriptorArray::CopyUpToAddAttributes(
handle(map->instance_descriptors(), isolate), num_descriptors,
attrs_to_add);
Handle<LayoutDescriptor> new_layout_descriptor(map->GetLayoutDescriptor(),
isolate);
Handle<Map> new_map = CopyReplaceDescriptors(
map, new_desc, new_layout_descriptor, INSERT_TRANSITION,
transition_marker, reason, SPECIAL_TRANSITION);
new_map->set_is_extensible(false);
if (!IsFixedTypedArrayElementsKind(map->elements_kind())) {
ElementsKind new_kind = IsStringWrapperElementsKind(map->elements_kind())
? SLOW_STRING_WRAPPER_ELEMENTS
: DICTIONARY_ELEMENTS;
new_map->set_elements_kind(new_kind);
}
return new_map;
}
namespace {
bool CanHoldValue(DescriptorArray* descriptors, int descriptor,
PropertyConstness constness, Object* value) {
PropertyDetails details = descriptors->GetDetails(descriptor);
if (details.location() == kField) {
if (details.kind() == kData) {
return IsGeneralizableTo(constness, details.constness()) &&
value->FitsRepresentation(details.representation()) &&
descriptors->GetFieldType(descriptor)->NowContains(value);
} else {
DCHECK_EQ(kAccessor, details.kind());
return false;
}
} else {
DCHECK_EQ(kDescriptor, details.location());
DCHECK_EQ(kConst, details.constness());
if (details.kind() == kData) {
DCHECK(!FLAG_track_constant_fields);
DCHECK(descriptors->GetValue(descriptor) != value ||
value->FitsRepresentation(details.representation()));
return descriptors->GetValue(descriptor) == value;
} else {
DCHECK_EQ(kAccessor, details.kind());
return false;
}
}
UNREACHABLE();
return false;
}
Handle<Map> UpdateDescriptorForValue(Handle<Map> map, int descriptor,
PropertyConstness constness,
Handle<Object> value) {
if (CanHoldValue(map->instance_descriptors(), descriptor, constness,
*value)) {
return map;
}
Isolate* isolate = map->GetIsolate();
PropertyAttributes attributes =
map->instance_descriptors()->GetDetails(descriptor).attributes();
Representation representation = value->OptimalRepresentation();
Handle<FieldType> type = value->OptimalType(isolate, representation);
MapUpdater mu(isolate, map);
return mu.ReconfigureToDataField(descriptor, attributes, constness,
representation, type);
}
} // namespace
// static
Handle<Map> Map::PrepareForDataProperty(Handle<Map> map, int descriptor,
PropertyConstness constness,
Handle<Object> value) {
// Dictionaries can store any property value.
DCHECK(!map->is_dictionary_map());
// Update to the newest map before storing the property.
return UpdateDescriptorForValue(Update(map), descriptor, constness, value);
}
Handle<Map> Map::TransitionToDataProperty(Handle<Map> map, Handle<Name> name,
Handle<Object> value,
PropertyAttributes attributes,
PropertyConstness constness,
StoreFromKeyed store_mode) {
RuntimeCallTimerScope stats_scope(
*map, map->is_prototype_map()
? &RuntimeCallStats::PrototypeMap_TransitionToDataProperty
: &RuntimeCallStats::Map_TransitionToDataProperty);
DCHECK(name->IsUniqueName());
DCHECK(!map->is_dictionary_map());
// Migrate to the newest map before storing the property.
map = Update(map);
Map* maybe_transition =
TransitionArray::SearchTransition(*map, kData, *name, attributes);
if (maybe_transition != NULL) {
Handle<Map> transition(maybe_transition);
int descriptor = transition->LastAdded();
DCHECK_EQ(attributes, transition->instance_descriptors()
->GetDetails(descriptor)
.attributes());
return UpdateDescriptorForValue(transition, descriptor, constness, value);
}
TransitionFlag flag = INSERT_TRANSITION;
MaybeHandle<Map> maybe_map;
if (!FLAG_track_constant_fields && value->IsJSFunction()) {
maybe_map = Map::CopyWithConstant(map, name, value, attributes, flag);
} else if (!map->TooManyFastProperties(store_mode)) {
Isolate* isolate = name->GetIsolate();
Representation representation = value->OptimalRepresentation();
Handle<FieldType> type = value->OptimalType(isolate, representation);
maybe_map = Map::CopyWithField(map, name, type, attributes, constness,
representation, flag);
}
Handle<Map> result;
if (!maybe_map.ToHandle(&result)) {
#if TRACE_MAPS
if (FLAG_trace_maps) {
Vector<char> name_buffer = Vector<char>::New(100);
name->NameShortPrint(name_buffer);
Vector<char> buffer = Vector<char>::New(128);
SNPrintF(buffer, "TooManyFastProperties %s", name_buffer.start());
return Map::Normalize(map, CLEAR_INOBJECT_PROPERTIES, buffer.start());
}
#endif
return Map::Normalize(map, CLEAR_INOBJECT_PROPERTIES,
"TooManyFastProperties");
}
return result;
}
Handle<Map> Map::ReconfigureExistingProperty(Handle<Map> map, int descriptor,
PropertyKind kind,
PropertyAttributes attributes) {
// Dictionaries have to be reconfigured in-place.
DCHECK(!map->is_dictionary_map());
if (!map->GetBackPointer()->IsMap()) {
// There is no benefit from reconstructing transition tree for maps without
// back pointers.
return CopyGeneralizeAllFields(map, map->elements_kind(), descriptor, kind,
attributes,
"GenAll_AttributesMismatchProtoMap");
}
if (FLAG_trace_generalization) {
map->PrintReconfiguration(stdout, descriptor, kind, attributes);
}
Isolate* isolate = map->GetIsolate();
MapUpdater mu(isolate, map);
DCHECK_EQ(kData, kind); // Only kData case is supported so far.
Handle<Map> new_map = mu.ReconfigureToDataField(
descriptor, attributes, kDefaultFieldConstness, Representation::None(),
FieldType::None(isolate));
return new_map;
}
Handle<Map> Map::TransitionToAccessorProperty(Isolate* isolate, Handle<Map> map,
Handle<Name> name, int descriptor,
Handle<Object> getter,
Handle<Object> setter,
PropertyAttributes attributes) {
RuntimeCallTimerScope stats_scope(
isolate,
map->is_prototype_map()
? &RuntimeCallStats::PrototypeMap_TransitionToAccessorProperty
: &RuntimeCallStats::Map_TransitionToAccessorProperty);
// At least one of the accessors needs to be a new value.
DCHECK(!getter->IsNull(isolate) || !setter->IsNull(isolate));
DCHECK(name->IsUniqueName());
// Dictionary maps can always have additional data properties.
if (map->is_dictionary_map()) return map;
// Migrate to the newest map before transitioning to the new property.
map = Update(map);
PropertyNormalizationMode mode = map->is_prototype_map()
? KEEP_INOBJECT_PROPERTIES
: CLEAR_INOBJECT_PROPERTIES;
Map* maybe_transition =
TransitionArray::SearchTransition(*map, kAccessor, *name, attributes);
if (maybe_transition != NULL) {
Handle<Map> transition(maybe_transition, isolate);
DescriptorArray* descriptors = transition->instance_descriptors();
int descriptor = transition->LastAdded();
DCHECK(descriptors->GetKey(descriptor)->Equals(*name));
DCHECK_EQ(kAccessor, descriptors->GetDetails(descriptor).kind());
DCHECK_EQ(attributes, descriptors->GetDetails(descriptor).attributes());
Handle<Object> maybe_pair(descriptors->GetValue(descriptor), isolate);
if (!maybe_pair->IsAccessorPair()) {
return Map::Normalize(map, mode, "TransitionToAccessorFromNonPair");
}
Handle<AccessorPair> pair = Handle<AccessorPair>::cast(maybe_pair);
if (!pair->Equals(*getter, *setter)) {
return Map::Normalize(map, mode, "TransitionToDifferentAccessor");
}
return transition;
}
Handle<AccessorPair> pair;
DescriptorArray* old_descriptors = map->instance_descriptors();
if (descriptor != DescriptorArray::kNotFound) {
if (descriptor != map->LastAdded()) {
return Map::Normalize(map, mode, "AccessorsOverwritingNonLast");
}
PropertyDetails old_details = old_descriptors->GetDetails(descriptor);
if (old_details.kind() != kAccessor) {
return Map::Normalize(map, mode, "AccessorsOverwritingNonAccessors");
}
if (old_details.attributes() != attributes) {
return Map::Normalize(map, mode, "AccessorsWithAttributes");
}
Handle<Object> maybe_pair(old_descriptors->GetValue(descriptor), isolate);
if (!maybe_pair->IsAccessorPair()) {
return Map::Normalize(map, mode, "AccessorsOverwritingNonPair");
}
Handle<AccessorPair> current_pair = Handle<AccessorPair>::cast(maybe_pair);
if (current_pair->Equals(*getter, *setter)) return map;
bool overwriting_accessor = false;
if (!getter->IsNull(isolate) &&
!current_pair->get(ACCESSOR_GETTER)->IsNull(isolate) &&
current_pair->get(ACCESSOR_GETTER) != *getter) {
overwriting_accessor = true;
}
if (!setter->IsNull(isolate) &&
!current_pair->get(ACCESSOR_SETTER)->IsNull(isolate) &&
current_pair->get(ACCESSOR_SETTER) != *setter) {
overwriting_accessor = true;
}
if (overwriting_accessor) {
return Map::Normalize(map, mode, "AccessorsOverwritingAccessors");
}
pair = AccessorPair::Copy(Handle<AccessorPair>::cast(maybe_pair));
} else if (map->NumberOfOwnDescriptors() >= kMaxNumberOfDescriptors ||
map->TooManyFastProperties(CERTAINLY_NOT_STORE_FROM_KEYED)) {
return Map::Normalize(map, CLEAR_INOBJECT_PROPERTIES, "TooManyAccessors");
} else {
pair = isolate->factory()->NewAccessorPair();
}
pair->SetComponents(*getter, *setter);
TransitionFlag flag = INSERT_TRANSITION;
Descriptor d = Descriptor::AccessorConstant(name, pair, attributes);
return Map::CopyInsertDescriptor(map, &d, flag);
}
Handle<Map> Map::CopyAddDescriptor(Handle<Map> map,
Descriptor* descriptor,
TransitionFlag flag) {
Handle<DescriptorArray> descriptors(map->instance_descriptors());
// Share descriptors only if map owns descriptors and it not an initial map.
if (flag == INSERT_TRANSITION && map->owns_descriptors() &&
!map->GetBackPointer()->IsUndefined(map->GetIsolate()) &&
TransitionArray::CanHaveMoreTransitions(map)) {
return ShareDescriptor(map, descriptors, descriptor);
}
int nof = map->NumberOfOwnDescriptors();
Handle<DescriptorArray> new_descriptors =
DescriptorArray::CopyUpTo(descriptors, nof, 1);
new_descriptors->Append(descriptor);
Handle<LayoutDescriptor> new_layout_descriptor =
FLAG_unbox_double_fields
? LayoutDescriptor::New(map, new_descriptors, nof + 1)
: handle(LayoutDescriptor::FastPointerLayout(), map->GetIsolate());
return CopyReplaceDescriptors(map, new_descriptors, new_layout_descriptor,
flag, descriptor->GetKey(), "CopyAddDescriptor",
SIMPLE_PROPERTY_TRANSITION);
}
Handle<Map> Map::CopyInsertDescriptor(Handle<Map> map,
Descriptor* descriptor,
TransitionFlag flag) {
Handle<DescriptorArray> old_descriptors(map->instance_descriptors());
// We replace the key if it is already present.
int index = old_descriptors->SearchWithCache(map->GetIsolate(),
*descriptor->GetKey(), *map);
if (index != DescriptorArray::kNotFound) {
return CopyReplaceDescriptor(map, old_descriptors, descriptor, index, flag);
}
return CopyAddDescriptor(map, descriptor, flag);
}
Handle<DescriptorArray> DescriptorArray::CopyUpTo(
Handle<DescriptorArray> desc,
int enumeration_index,
int slack) {
return DescriptorArray::CopyUpToAddAttributes(
desc, enumeration_index, NONE, slack);
}
Handle<DescriptorArray> DescriptorArray::CopyUpToAddAttributes(
Handle<DescriptorArray> desc,
int enumeration_index,
PropertyAttributes attributes,
int slack) {
if (enumeration_index + slack == 0) {
return desc->GetIsolate()->factory()->empty_descriptor_array();
}
int size = enumeration_index;
Handle<DescriptorArray> descriptors =
DescriptorArray::Allocate(desc->GetIsolate(), size, slack);
if (attributes != NONE) {
for (int i = 0; i < size; ++i) {
Object* value = desc->GetValue(i);
Name* key = desc->GetKey(i);
PropertyDetails details = desc->GetDetails(i);
// Bulk attribute changes never affect private properties.
if (!key->IsPrivate()) {
int mask = DONT_DELETE | DONT_ENUM;
// READ_ONLY is an invalid attribute for JS setters/getters.
if (details.kind() != kAccessor || !value->IsAccessorPair()) {
mask |= READ_ONLY;
}
details = details.CopyAddAttributes(
static_cast<PropertyAttributes>(attributes & mask));
}
descriptors->Set(i, key, value, details);
}
} else {
for (int i = 0; i < size; ++i) {
descriptors->CopyFrom(i, *desc);
}
}
if (desc->number_of_descriptors() != enumeration_index) descriptors->Sort();
return descriptors;
}
bool DescriptorArray::IsEqualUpTo(DescriptorArray* desc, int nof_descriptors) {
for (int i = 0; i < nof_descriptors; i++) {
if (GetKey(i) != desc->GetKey(i) || GetValue(i) != desc->GetValue(i)) {
return false;
}
PropertyDetails details = GetDetails(i);
PropertyDetails other_details = desc->GetDetails(i);
if (details.kind() != other_details.kind() ||
details.location() != other_details.location() ||
!details.representation().Equals(other_details.representation())) {
return false;
}
}
return true;
}
Handle<Map> Map::CopyReplaceDescriptor(Handle<Map> map,
Handle<DescriptorArray> descriptors,
Descriptor* descriptor,
int insertion_index,
TransitionFlag flag) {
Handle<Name> key = descriptor->GetKey();
DCHECK(*key == descriptors->GetKey(insertion_index));
Handle<DescriptorArray> new_descriptors = DescriptorArray::CopyUpTo(
descriptors, map->NumberOfOwnDescriptors());
new_descriptors->Replace(insertion_index, descriptor);
Handle<LayoutDescriptor> new_layout_descriptor = LayoutDescriptor::New(
map, new_descriptors, new_descriptors->number_of_descriptors());
SimpleTransitionFlag simple_flag =
(insertion_index == descriptors->number_of_descriptors() - 1)
? SIMPLE_PROPERTY_TRANSITION
: PROPERTY_TRANSITION;
return CopyReplaceDescriptors(map, new_descriptors, new_layout_descriptor,
flag, key, "CopyReplaceDescriptor",
simple_flag);
}
// Helper class to manage a Map's code cache. The layout depends on the number
// of entries; this is worthwhile because most code caches are very small,
// but some are huge (thousands of entries).
// For zero entries, the EmptyFixedArray is used.
// For one entry, we use a 2-element FixedArray containing [name, code].
// For 2..100 entries, we use a FixedArray with linear lookups, the layout is:
// [0] - number of slots that are currently in use
// [1] - first name
// [2] - first code
// [3] - second name
// [4] - second code
// etc.
// For more than 128 entries, we use a CodeCacheHashTable.
class CodeCache : public AllStatic {
public:
// Returns the new cache, to be stored on the map.
static Handle<FixedArray> Put(Isolate* isolate, Handle<FixedArray> cache,
Handle<Name> name, Handle<Code> code) {
int length = cache->length();
if (length == 0) return PutFirstElement(isolate, name, code);
if (length == kEntrySize) {
return PutSecondElement(isolate, cache, name, code);
}
if (length <= kLinearMaxSize) {
Handle<FixedArray> result = PutLinearElement(isolate, cache, name, code);
if (!result.is_null()) return result;
// Fall through if linear storage is getting too large.
}
return PutHashTableElement(isolate, cache, name, code);
}
static Code* Lookup(FixedArray* cache, Name* name, Code::Flags flags) {
int length = cache->length();
if (length == 0) return nullptr;
if (length == kEntrySize) return OneElementLookup(cache, name, flags);
if (!cache->IsCodeCacheHashTable()) {
return LinearLookup(cache, name, flags);
} else {
return CodeCacheHashTable::cast(cache)->Lookup(name, flags);
}
}
private:
static const int kNameIndex = 0;
static const int kCodeIndex = 1;
static const int kEntrySize = 2;
static const int kLinearUsageIndex = 0;
static const int kLinearReservedSlots = 1;
static const int kLinearInitialCapacity = 2;
static const int kLinearMaxSize = 257; // == LinearSizeFor(128);
static const int kHashTableInitialCapacity = 200; // Number of entries.
static int LinearSizeFor(int entries) {
return kLinearReservedSlots + kEntrySize * entries;
}
static int LinearNewSize(int old_size) {
int old_entries = (old_size - kLinearReservedSlots) / kEntrySize;
return LinearSizeFor(old_entries * 2);
}
static Code* OneElementLookup(FixedArray* cache, Name* name,
Code::Flags flags) {
DCHECK_EQ(cache->length(), kEntrySize);
if (cache->get(kNameIndex) != name) return nullptr;
Code* maybe_code = Code::cast(cache->get(kCodeIndex));
if (maybe_code->flags() != flags) return nullptr;
return maybe_code;
}
static Code* LinearLookup(FixedArray* cache, Name* name, Code::Flags flags) {
DCHECK_GE(cache->length(), kEntrySize);
DCHECK(!cache->IsCodeCacheHashTable());
int usage = GetLinearUsage(cache);
for (int i = kLinearReservedSlots; i < usage; i += kEntrySize) {
if (cache->get(i + kNameIndex) != name) continue;
Code* code = Code::cast(cache->get(i + kCodeIndex));
if (code->flags() == flags) return code;
}
return nullptr;
}
static Handle<FixedArray> PutFirstElement(Isolate* isolate, Handle<Name> name,
Handle<Code> code) {
Handle<FixedArray> cache = isolate->factory()->NewFixedArray(kEntrySize);
cache->set(kNameIndex, *name);
cache->set(kCodeIndex, *code);
return cache;
}
static Handle<FixedArray> PutSecondElement(Isolate* isolate,
Handle<FixedArray> cache,
Handle<Name> name,
Handle<Code> code) {
DCHECK_EQ(cache->length(), kEntrySize);
Handle<FixedArray> new_cache = isolate->factory()->NewFixedArray(
LinearSizeFor(kLinearInitialCapacity));
new_cache->set(kLinearReservedSlots + kNameIndex, cache->get(kNameIndex));
new_cache->set(kLinearReservedSlots + kCodeIndex, cache->get(kCodeIndex));
new_cache->set(LinearSizeFor(1) + kNameIndex, *name);
new_cache->set(LinearSizeFor(1) + kCodeIndex, *code);
new_cache->set(kLinearUsageIndex, Smi::FromInt(LinearSizeFor(2)));
return new_cache;
}
static Handle<FixedArray> PutLinearElement(Isolate* isolate,
Handle<FixedArray> cache,
Handle<Name> name,
Handle<Code> code) {
int length = cache->length();
int usage = GetLinearUsage(*cache);
DCHECK_LE(usage, length);
// Check if we need to grow.
if (usage == length) {
int new_length = LinearNewSize(length);
if (new_length > kLinearMaxSize) return Handle<FixedArray>::null();
Handle<FixedArray> new_cache =
isolate->factory()->NewFixedArray(new_length);
for (int i = kLinearReservedSlots; i < length; i++) {
new_cache->set(i, cache->get(i));
}
cache = new_cache;
}
// Store new entry.
DCHECK_GE(cache->length(), usage + kEntrySize);
cache->set(usage + kNameIndex, *name);
cache->set(usage + kCodeIndex, *code);
cache->set(kLinearUsageIndex, Smi::FromInt(usage + kEntrySize));
return cache;
}
static Handle<FixedArray> PutHashTableElement(Isolate* isolate,
Handle<FixedArray> cache,
Handle<Name> name,
Handle<Code> code) {
// Check if we need to transition from linear to hash table storage.
if (!cache->IsCodeCacheHashTable()) {
// Check that the initial hash table capacity is large enough.
DCHECK_EQ(kLinearMaxSize, LinearSizeFor(128));
STATIC_ASSERT(kHashTableInitialCapacity > 128);
int length = cache->length();
// Only migrate from linear storage when it's full.
DCHECK_EQ(length, GetLinearUsage(*cache));
DCHECK_EQ(length, kLinearMaxSize);
Handle<CodeCacheHashTable> table =
CodeCacheHashTable::New(isolate, kHashTableInitialCapacity);
HandleScope scope(isolate);
for (int i = kLinearReservedSlots; i < length; i += kEntrySize) {
Handle<Name> old_name(Name::cast(cache->get(i + kNameIndex)), isolate);
Handle<Code> old_code(Code::cast(cache->get(i + kCodeIndex)), isolate);
CodeCacheHashTable::Put(table, old_name, old_code);
}
cache = table;
}
// Store new entry.
DCHECK(cache->IsCodeCacheHashTable());
return CodeCacheHashTable::Put(Handle<CodeCacheHashTable>::cast(cache),
name, code);
}
static inline int GetLinearUsage(FixedArray* linear_cache) {
DCHECK_GT(linear_cache->length(), kEntrySize);
return Smi::cast(linear_cache->get(kLinearUsageIndex))->value();
}
};
void Map::UpdateCodeCache(Handle<Map> map,
Handle<Name> name,
Handle<Code> code) {
Isolate* isolate = map->GetIsolate();
Handle<FixedArray> cache(map->code_cache(), isolate);
Handle<FixedArray> new_cache = CodeCache::Put(isolate, cache, name, code);
map->set_code_cache(*new_cache);
}
Code* Map::LookupInCodeCache(Name* name, Code::Flags flags) {
return CodeCache::Lookup(code_cache(), name, flags);
}
// The key in the code cache hash table consists of the property name and the
// code object. The actual match is on the name and the code flags. If a key
// is created using the flags and not a code object it can only be used for
// lookup not to create a new entry.
class CodeCacheHashTableKey : public HashTableKey {
public:
CodeCacheHashTableKey(Handle<Name> name, Code::Flags flags)
: name_(name), flags_(flags), code_() {
DCHECK(name_->IsUniqueName());
}
CodeCacheHashTableKey(Handle<Name> name, Handle<Code> code)
: name_(name), flags_(code->flags()), code_(code) {
DCHECK(name_->IsUniqueName());
}
bool IsMatch(Object* other) override {
DCHECK(other->IsFixedArray());
FixedArray* pair = FixedArray::cast(other);
Name* name = Name::cast(pair->get(0));
Code::Flags flags = Code::cast(pair->get(1))->flags();
if (flags != flags_) return false;
DCHECK(name->IsUniqueName());
return *name_ == name;
}
static uint32_t NameFlagsHashHelper(Name* name, Code::Flags flags) {
return name->Hash() ^ flags;
}
uint32_t Hash() override { return NameFlagsHashHelper(*name_, flags_); }
uint32_t HashForObject(Object* obj) override {
FixedArray* pair = FixedArray::cast(obj);
Name* name = Name::cast(pair->get(0));
Code* code = Code::cast(pair->get(1));
return NameFlagsHashHelper(name, code->flags());
}
MUST_USE_RESULT Handle<Object> AsHandle(Isolate* isolate) override {
Handle<Code> code = code_.ToHandleChecked();
Handle<FixedArray> pair = isolate->factory()->NewFixedArray(2);
pair->set(0, *name_);
pair->set(1, *code);
return pair;
}
private:
Handle<Name> name_;
Code::Flags flags_;
// TODO(jkummerow): We should be able to get by without this.
MaybeHandle<Code> code_;
};
Handle<CodeCacheHashTable> CodeCacheHashTable::Put(
Handle<CodeCacheHashTable> cache, Handle<Name> name, Handle<Code> code) {
CodeCacheHashTableKey key(name, code);
Handle<CodeCacheHashTable> new_cache = EnsureCapacity(cache, 1, &key);
int entry = new_cache->FindInsertionEntry(key.Hash());
Handle<Object> k = key.AsHandle(cache->GetIsolate());
new_cache->set(EntryToIndex(entry), *k);
new_cache->ElementAdded();
return new_cache;
}
Code* CodeCacheHashTable::Lookup(Name* name, Code::Flags flags) {
DisallowHeapAllocation no_alloc;
CodeCacheHashTableKey key(handle(name), flags);
int entry = FindEntry(&key);
if (entry == kNotFound) return nullptr;
return Code::cast(FixedArray::cast(get(EntryToIndex(entry)))->get(1));
}
Handle<FixedArray> FixedArray::SetAndGrow(Handle<FixedArray> array, int index,
Handle<Object> value) {
if (index < array->length()) {
array->set(index, *value);
return array;
}
int capacity = array->length();
do {
capacity = JSObject::NewElementsCapacity(capacity);
} while (capacity <= index);
Handle<FixedArray> new_array =
array->GetIsolate()->factory()->NewUninitializedFixedArray(capacity);
array->CopyTo(0, *new_array, 0, array->length());
new_array->FillWithHoles(array->length(), new_array->length());
new_array->set(index, *value);
return new_array;
}
void FixedArray::Shrink(int new_length) {
DCHECK(0 <= new_length && new_length <= length());
if (new_length < length()) {
GetHeap()->RightTrimFixedArray(this, length() - new_length);
}
}
void FixedArray::CopyTo(int pos, FixedArray* dest, int dest_pos, int len) {
DisallowHeapAllocation no_gc;
WriteBarrierMode mode = dest->GetWriteBarrierMode(no_gc);
for (int index = 0; index < len; index++) {
dest->set(dest_pos+index, get(pos+index), mode);
}
}
#ifdef DEBUG
bool FixedArray::IsEqualTo(FixedArray* other) {
if (length() != other->length()) return false;
for (int i = 0 ; i < length(); ++i) {
if (get(i) != other->get(i)) return false;
}
return true;
}
#endif
// static
void WeakFixedArray::Set(Handle<WeakFixedArray> array, int index,
Handle<HeapObject> value) {
DCHECK(array->IsEmptySlot(index)); // Don't overwrite anything.
Handle<WeakCell> cell =
value->IsMap() ? Map::WeakCellForMap(Handle<Map>::cast(value))
: array->GetIsolate()->factory()->NewWeakCell(value);
Handle<FixedArray>::cast(array)->set(index + kFirstIndex, *cell);
if (FLAG_trace_weak_arrays) {
PrintF("[WeakFixedArray: storing at index %d ]\n", index);
}
array->set_last_used_index(index);
}
// static
Handle<WeakFixedArray> WeakFixedArray::Add(Handle<Object> maybe_array,
Handle<HeapObject> value,
int* assigned_index) {
Handle<WeakFixedArray> array =
(maybe_array.is_null() || !maybe_array->IsWeakFixedArray())
? Allocate(value->GetIsolate(), 1, Handle<WeakFixedArray>::null())
: Handle<WeakFixedArray>::cast(maybe_array);
// Try to store the new entry if there's room. Optimize for consecutive
// accesses.
int first_index = array->last_used_index();
int length = array->Length();
if (length > 0) {
for (int i = first_index;;) {
if (array->IsEmptySlot((i))) {
WeakFixedArray::Set(array, i, value);
if (assigned_index != NULL) *assigned_index = i;
return array;
}
if (FLAG_trace_weak_arrays) {
PrintF("[WeakFixedArray: searching for free slot]\n");
}
i = (i + 1) % length;
if (i == first_index) break;
}
}
// No usable slot found, grow the array.
int new_length = length == 0 ? 1 : length + (length >> 1) + 4;
Handle<WeakFixedArray> new_array =
Allocate(array->GetIsolate(), new_length, array);
if (FLAG_trace_weak_arrays) {
PrintF("[WeakFixedArray: growing to size %d ]\n", new_length);
}
WeakFixedArray::Set(new_array, length, value);
if (assigned_index != NULL) *assigned_index = length;
return new_array;
}
template <class CompactionCallback>
void WeakFixedArray::Compact() {
FixedArray* array = FixedArray::cast(this);
int new_length = kFirstIndex;
for (int i = kFirstIndex; i < array->length(); i++) {
Object* element = array->get(i);
if (element->IsSmi()) continue;
if (WeakCell::cast(element)->cleared()) continue;
Object* value = WeakCell::cast(element)->value();
CompactionCallback::Callback(value, i - kFirstIndex,
new_length - kFirstIndex);
array->set(new_length++, element);
}
array->Shrink(new_length);
set_last_used_index(0);
}
void WeakFixedArray::Iterator::Reset(Object* maybe_array) {
if (maybe_array->IsWeakFixedArray()) {
list_ = WeakFixedArray::cast(maybe_array);
index_ = 0;
#ifdef DEBUG
last_used_index_ = list_->last_used_index();
#endif // DEBUG
}
}
void JSObject::PrototypeRegistryCompactionCallback::Callback(Object* value,
int old_index,
int new_index) {
DCHECK(value->IsMap() && Map::cast(value)->is_prototype_map());
Map* map = Map::cast(value);
DCHECK(map->prototype_info()->IsPrototypeInfo());
PrototypeInfo* proto_info = PrototypeInfo::cast(map->prototype_info());
DCHECK_EQ(old_index, proto_info->registry_slot());
proto_info->set_registry_slot(new_index);
}
template void WeakFixedArray::Compact<WeakFixedArray::NullCallback>();
template void
WeakFixedArray::Compact<JSObject::PrototypeRegistryCompactionCallback>();
bool WeakFixedArray::Remove(Handle<HeapObject> value) {
if (Length() == 0) return false;
// Optimize for the most recently added element to be removed again.
int first_index = last_used_index();
for (int i = first_index;;) {
if (Get(i) == *value) {
Clear(i);
// Users of WeakFixedArray should make sure that there are no duplicates.
return true;
}
i = (i + 1) % Length();
if (i == first_index) return false;
}
UNREACHABLE();
}
// static
Handle<WeakFixedArray> WeakFixedArray::Allocate(
Isolate* isolate, int size, Handle<WeakFixedArray> initialize_from) {
DCHECK(0 <= size);
Handle<FixedArray> result =
isolate->factory()->NewUninitializedFixedArray(size + kFirstIndex);
int index = 0;
if (!initialize_from.is_null()) {
DCHECK(initialize_from->Length() <= size);
Handle<FixedArray> raw_source = Handle<FixedArray>::cast(initialize_from);
// Copy the entries without compacting, since the PrototypeInfo relies on
// the index of the entries not to change.
while (index < raw_source->length()) {
result->set(index, raw_source->get(index));
index++;
}
}
while (index < result->length()) {
result->set(index, Smi::kZero);
index++;
}
return Handle<WeakFixedArray>::cast(result);
}
Handle<ArrayList> ArrayList::Add(Handle<ArrayList> array, Handle<Object> obj,
AddMode mode) {
int length = array->Length();
array = EnsureSpace(array, length + 1);
if (mode == kReloadLengthAfterAllocation) {
DCHECK(array->Length() <= length);
length = array->Length();
}
array->Set(length, *obj);
array->SetLength(length + 1);
return array;
}
Handle<ArrayList> ArrayList::Add(Handle<ArrayList> array, Handle<Object> obj1,
Handle<Object> obj2, AddMode mode) {
int length = array->Length();
array = EnsureSpace(array, length + 2);
if (mode == kReloadLengthAfterAllocation) {
length = array->Length();
}
array->Set(length, *obj1);
array->Set(length + 1, *obj2);
array->SetLength(length + 2);
return array;
}
Handle<ArrayList> ArrayList::New(Isolate* isolate, int size) {
Handle<ArrayList> result = Handle<ArrayList>::cast(
isolate->factory()->NewFixedArray(size + kFirstIndex));
result->SetLength(0);
return result;
}
bool ArrayList::IsFull() {
int capacity = length();
return kFirstIndex + Length() == capacity;
}
namespace {
Handle<FixedArray> EnsureSpaceInFixedArray(Handle<FixedArray> array,
int length) {
int capacity = array->length();
if (capacity < length) {
Isolate* isolate = array->GetIsolate();
int new_capacity = length;
new_capacity = new_capacity + Max(new_capacity / 2, 2);
int grow_by = new_capacity - capacity;
array = Handle<ArrayList>::cast(
isolate->factory()->CopyFixedArrayAndGrow(array, grow_by));
}
return array;
}
} // namespace
Handle<ArrayList> ArrayList::EnsureSpace(Handle<ArrayList> array, int length) {
const bool empty = (array->length() == 0);
auto ret = Handle<ArrayList>::cast(
EnsureSpaceInFixedArray(array, kFirstIndex + length));
if (empty) ret->SetLength(0);
return ret;
}
Handle<RegExpMatchInfo> RegExpMatchInfo::ReserveCaptures(
Handle<RegExpMatchInfo> match_info, int capture_count) {
DCHECK_GE(match_info->length(), kLastMatchOverhead);
const int required_length = kFirstCaptureIndex + capture_count;
Handle<FixedArray> result =
EnsureSpaceInFixedArray(match_info, required_length);
return Handle<RegExpMatchInfo>::cast(result);
}
// static
Handle<FrameArray> FrameArray::AppendJSFrame(Handle<FrameArray> in,
Handle<Object> receiver,
Handle<JSFunction> function,
Handle<AbstractCode> code,
int offset, int flags) {
const int frame_count = in->FrameCount();
const int new_length = LengthFor(frame_count + 1);
Handle<FrameArray> array = EnsureSpace(in, new_length);
array->SetReceiver(frame_count, *receiver);
array->SetFunction(frame_count, *function);
array->SetCode(frame_count, *code);
array->SetOffset(frame_count, Smi::FromInt(offset));
array->SetFlags(frame_count, Smi::FromInt(flags));
array->set(kFrameCountIndex, Smi::FromInt(frame_count + 1));
return array;
}
// static
Handle<FrameArray> FrameArray::AppendWasmFrame(Handle<FrameArray> in,
Handle<Object> wasm_instance,
int wasm_function_index,
Handle<AbstractCode> code,
int offset, int flags) {
const int frame_count = in->FrameCount();
const int new_length = LengthFor(frame_count + 1);
Handle<FrameArray> array = EnsureSpace(in, new_length);
array->SetWasmInstance(frame_count, *wasm_instance);
array->SetWasmFunctionIndex(frame_count, Smi::FromInt(wasm_function_index));
array->SetCode(frame_count, *code);
array->SetOffset(frame_count, Smi::FromInt(offset));
array->SetFlags(frame_count, Smi::FromInt(flags));
array->set(kFrameCountIndex, Smi::FromInt(frame_count + 1));
return array;
}
void FrameArray::ShrinkToFit() { Shrink(LengthFor(FrameCount())); }
// static
Handle<FrameArray> FrameArray::EnsureSpace(Handle<FrameArray> array,
int length) {
return Handle<FrameArray>::cast(EnsureSpaceInFixedArray(array, length));
}
Handle<DescriptorArray> DescriptorArray::Allocate(Isolate* isolate,
int number_of_descriptors,
int slack,
PretenureFlag pretenure) {
DCHECK(0 <= number_of_descriptors);
Factory* factory = isolate->factory();
// Do not use DescriptorArray::cast on incomplete object.
int size = number_of_descriptors + slack;
if (size == 0) return factory->empty_descriptor_array();
// Allocate the array of keys.
Handle<FixedArray> result =
factory->NewFixedArray(LengthFor(size), pretenure);
result->set(kDescriptorLengthIndex, Smi::FromInt(number_of_descriptors));
result->set(kEnumCacheIndex, Smi::kZero);
return Handle<DescriptorArray>::cast(result);
}
void DescriptorArray::ClearEnumCache() { set(kEnumCacheIndex, Smi::kZero); }
void DescriptorArray::Replace(int index, Descriptor* descriptor) {
descriptor->SetSortedKeyIndex(GetSortedKeyIndex(index));
Set(index, descriptor);
}
// static
void DescriptorArray::SetEnumCache(Handle<DescriptorArray> descriptors,
Isolate* isolate,
Handle<FixedArray> new_cache,
Handle<FixedArray> new_index_cache) {
DCHECK(!descriptors->IsEmpty());
FixedArray* bridge_storage;
bool needs_new_enum_cache = !descriptors->HasEnumCache();
if (needs_new_enum_cache) {
bridge_storage = *isolate->factory()->NewFixedArray(
DescriptorArray::kEnumCacheBridgeLength);
} else {
bridge_storage = FixedArray::cast(descriptors->get(kEnumCacheIndex));
}
bridge_storage->set(kEnumCacheBridgeCacheIndex, *new_cache);
bridge_storage->set(
kEnumCacheBridgeIndicesCacheIndex,
new_index_cache.is_null() ? Object::cast(Smi::kZero) : *new_index_cache);
if (needs_new_enum_cache) {
descriptors->set(kEnumCacheIndex, bridge_storage);
}
}
void DescriptorArray::CopyFrom(int index, DescriptorArray* src) {
PropertyDetails details = src->GetDetails(index);
Set(index, src->GetKey(index), src->GetValue(index), details);
}
void DescriptorArray::Sort() {
// In-place heap sort.
int len = number_of_descriptors();
// Reset sorting since the descriptor array might contain invalid pointers.
for (int i = 0; i < len; ++i) SetSortedKey(i, i);
// Bottom-up max-heap construction.
// Index of the last node with children
const int max_parent_index = (len / 2) - 1;
for (int i = max_parent_index; i >= 0; --i) {
int parent_index = i;
const uint32_t parent_hash = GetSortedKey(i)->Hash();
while (parent_index <= max_parent_index) {
int child_index = 2 * parent_index + 1;
uint32_t child_hash = GetSortedKey(child_index)->Hash();
if (child_index + 1 < len) {
uint32_t right_child_hash = GetSortedKey(child_index + 1)->Hash();
if (right_child_hash > child_hash) {
child_index++;
child_hash = right_child_hash;
}
}
if (child_hash <= parent_hash) break;
SwapSortedKeys(parent_index, child_index);
// Now element at child_index could be < its children.
parent_index = child_index; // parent_hash remains correct.
}
}
// Extract elements and create sorted array.
for (int i = len - 1; i > 0; --i) {
// Put max element at the back of the array.
SwapSortedKeys(0, i);
// Shift down the new top element.
int parent_index = 0;
const uint32_t parent_hash = GetSortedKey(parent_index)->Hash();
const int max_parent_index = (i / 2) - 1;
while (parent_index <= max_parent_index) {
int child_index = parent_index * 2 + 1;
uint32_t child_hash = GetSortedKey(child_index)->Hash();
if (child_index + 1 < i) {
uint32_t right_child_hash = GetSortedKey(child_index + 1)->Hash();
if (right_child_hash > child_hash) {
child_index++;
child_hash = right_child_hash;
}
}
if (child_hash <= parent_hash) break;
SwapSortedKeys(parent_index, child_index);
parent_index = child_index;
}
}
DCHECK(IsSortedNoDuplicates());
}
Handle<AccessorPair> AccessorPair::Copy(Handle<AccessorPair> pair) {
Handle<AccessorPair> copy = pair->GetIsolate()->factory()->NewAccessorPair();
copy->set_getter(pair->getter());
copy->set_setter(pair->setter());
return copy;
}
Handle<Object> AccessorPair::GetComponent(Handle<AccessorPair> accessor_pair,
AccessorComponent component) {
Object* accessor = accessor_pair->get(component);
if (accessor->IsFunctionTemplateInfo()) {
return ApiNatives::InstantiateFunction(
handle(FunctionTemplateInfo::cast(accessor)))
.ToHandleChecked();
}
Isolate* isolate = accessor_pair->GetIsolate();
if (accessor->IsNull(isolate)) {
return isolate->factory()->undefined_value();
}
return handle(accessor, isolate);
}
Handle<DeoptimizationInputData> DeoptimizationInputData::New(
Isolate* isolate, int deopt_entry_count, PretenureFlag pretenure) {
return Handle<DeoptimizationInputData>::cast(
isolate->factory()->NewFixedArray(LengthFor(deopt_entry_count),
pretenure));
}
Handle<DeoptimizationOutputData> DeoptimizationOutputData::New(
Isolate* isolate,
int number_of_deopt_points,
PretenureFlag pretenure) {
Handle<FixedArray> result;
if (number_of_deopt_points == 0) {
result = isolate->factory()->empty_fixed_array();
} else {
result = isolate->factory()->NewFixedArray(
LengthOfFixedArray(number_of_deopt_points), pretenure);
}
return Handle<DeoptimizationOutputData>::cast(result);
}
SharedFunctionInfo* DeoptimizationInputData::GetInlinedFunction(int index) {
if (index == -1) {
return SharedFunctionInfo::cast(SharedFunctionInfo());
} else {
return SharedFunctionInfo::cast(LiteralArray()->get(index));
}
}
int HandlerTable::LookupRange(int pc_offset, int* data_out,
CatchPrediction* prediction_out) {
int innermost_handler = -1;
#ifdef DEBUG
// Assuming that ranges are well nested, we don't need to track the innermost
// offsets. This is just to verify that the table is actually well nested.
int innermost_start = std::numeric_limits<int>::min();
int innermost_end = std::numeric_limits<int>::max();
#endif
for (int i = 0; i < length(); i += kRangeEntrySize) {
int start_offset = Smi::cast(get(i + kRangeStartIndex))->value();
int end_offset = Smi::cast(get(i + kRangeEndIndex))->value();
int handler_field = Smi::cast(get(i + kRangeHandlerIndex))->value();
int handler_offset = HandlerOffsetField::decode(handler_field);
CatchPrediction prediction = HandlerPredictionField::decode(handler_field);
int handler_data = Smi::cast(get(i + kRangeDataIndex))->value();
if (pc_offset >= start_offset && pc_offset < end_offset) {
DCHECK_GE(start_offset, innermost_start);
DCHECK_LT(end_offset, innermost_end);
innermost_handler = handler_offset;
#ifdef DEBUG
innermost_start = start_offset;
innermost_end = end_offset;
#endif
if (data_out) *data_out = handler_data;
if (prediction_out) *prediction_out = prediction;
}
}
return innermost_handler;
}
// TODO(turbofan): Make sure table is sorted and use binary search.
int HandlerTable::LookupReturn(int pc_offset) {
for (int i = 0; i < length(); i += kReturnEntrySize) {
int return_offset = Smi::cast(get(i + kReturnOffsetIndex))->value();
int handler_field = Smi::cast(get(i + kReturnHandlerIndex))->value();
if (pc_offset == return_offset) {
return HandlerOffsetField::decode(handler_field);
}
}
return -1;
}
#ifdef DEBUG
bool DescriptorArray::IsEqualTo(DescriptorArray* other) {
if (IsEmpty()) return other->IsEmpty();
if (other->IsEmpty()) return false;
if (length() != other->length()) return false;
for (int i = 0; i < length(); ++i) {
if (get(i) != other->get(i)) return false;
}
return true;
}
#endif
// static
Handle<String> String::Trim(Handle<String> string, TrimMode mode) {
Isolate* const isolate = string->GetIsolate();
string = String::Flatten(string);
int const length = string->length();
// Perform left trimming if requested.
int left = 0;
UnicodeCache* unicode_cache = isolate->unicode_cache();
if (mode == kTrim || mode == kTrimLeft) {
while (left < length &&
unicode_cache->IsWhiteSpaceOrLineTerminator(string->Get(left))) {
left++;
}
}
// Perform right trimming if requested.
int right = length;
if (mode == kTrim || mode == kTrimRight) {
while (
right > left &&
unicode_cache->IsWhiteSpaceOrLineTerminator(string->Get(right - 1))) {
right--;
}
}
return isolate->factory()->NewSubString(string, left, right);
}
bool String::LooksValid() { return GetIsolate()->heap()->Contains(this); }
// static
MaybeHandle<String> Name::ToFunctionName(Handle<Name> name) {
if (name->IsString()) return Handle<String>::cast(name);
// ES6 section 9.2.11 SetFunctionName, step 4.
Isolate* const isolate = name->GetIsolate();
Handle<Object> description(Handle<Symbol>::cast(name)->name(), isolate);
if (description->IsUndefined(isolate)) {
return isolate->factory()->empty_string();
}
IncrementalStringBuilder builder(isolate);
builder.AppendCharacter('[');
builder.AppendString(Handle<String>::cast(description));
builder.AppendCharacter(']');
return builder.Finish();
}
// static
MaybeHandle<String> Name::ToFunctionName(Handle<Name> name,
Handle<String> prefix) {
Handle<String> name_string;
Isolate* const isolate = name->GetIsolate();
ASSIGN_RETURN_ON_EXCEPTION(isolate, name_string, ToFunctionName(name),
String);
IncrementalStringBuilder builder(isolate);
builder.AppendString(prefix);
builder.AppendCharacter(' ');
builder.AppendString(name_string);
return builder.Finish();
}
namespace {
bool AreDigits(const uint8_t* s, int from, int to) {
for (int i = from; i < to; i++) {
if (s[i] < '0' || s[i] > '9') return false;
}
return true;
}
int ParseDecimalInteger(const uint8_t* s, int from, int to) {
DCHECK(to - from < 10); // Overflow is not possible.
DCHECK(from < to);
int d = s[from] - '0';
for (int i = from + 1; i < to; i++) {
d = 10 * d + (s[i] - '0');
}
return d;
}
} // namespace
// static
Handle<Object> String::ToNumber(Handle<String> subject) {
Isolate* const isolate = subject->GetIsolate();
// Flatten {subject} string first.
subject = String::Flatten(subject);
// Fast array index case.
uint32_t index;
if (subject->AsArrayIndex(&index)) {
return isolate->factory()->NewNumberFromUint(index);
}
// Fast case: short integer or some sorts of junk values.
if (subject->IsSeqOneByteString()) {
int len = subject->length();
if (len == 0) return handle(Smi::kZero, isolate);
DisallowHeapAllocation no_gc;
uint8_t const* data = Handle<SeqOneByteString>::cast(subject)->GetChars();
bool minus = (data[0] == '-');
int start_pos = (minus ? 1 : 0);
if (start_pos == len) {
return isolate->factory()->nan_value();
} else if (data[start_pos] > '9') {
// Fast check for a junk value. A valid string may start from a
// whitespace, a sign ('+' or '-'), the decimal point, a decimal digit
// or the 'I' character ('Infinity'). All of that have codes not greater
// than '9' except 'I' and .
if (data[start_pos] != 'I' && data[start_pos] != 0xa0) {
return isolate->factory()->nan_value();
}
} else if (len - start_pos < 10 && AreDigits(data, start_pos, len)) {
// The maximal/minimal smi has 10 digits. If the string has less digits
// we know it will fit into the smi-data type.
int d = ParseDecimalInteger(data, start_pos, len);
if (minus) {
if (d == 0) return isolate->factory()->minus_zero_value();
d = -d;
} else if (!subject->HasHashCode() && len <= String::kMaxArrayIndexSize &&
(len == 1 || data[0] != '0')) {
// String hash is not calculated yet but all the data are present.
// Update the hash field to speed up sequential convertions.
uint32_t hash = StringHasher::MakeArrayIndexHash(d, len);
#ifdef DEBUG
subject->Hash(); // Force hash calculation.
DCHECK_EQ(static_cast<int>(subject->hash_field()),
static_cast<int>(hash));
#endif
subject->set_hash_field(hash);
}
return handle(Smi::FromInt(d), isolate);
}
}
// Slower case.
int flags = ALLOW_HEX | ALLOW_OCTAL | ALLOW_BINARY;
return isolate->factory()->NewNumber(
StringToDouble(isolate->unicode_cache(), subject, flags));
}
String::FlatContent String::GetFlatContent() {
DCHECK(!AllowHeapAllocation::IsAllowed());
int length = this->length();
StringShape shape(this);
String* string = this;
int offset = 0;
if (shape.representation_tag() == kConsStringTag) {
ConsString* cons = ConsString::cast(string);
if (cons->second()->length() != 0) {
return FlatContent();
}
string = cons->first();
shape = StringShape(string);
} else if (shape.representation_tag() == kSlicedStringTag) {
SlicedString* slice = SlicedString::cast(string);
offset = slice->offset();
string = slice->parent();
shape = StringShape(string);
DCHECK(shape.representation_tag() != kConsStringTag &&
shape.representation_tag() != kSlicedStringTag);
}
if (shape.representation_tag() == kThinStringTag) {
ThinString* thin = ThinString::cast(string);
string = thin->actual();
shape = StringShape(string);
DCHECK(!shape.IsCons());
DCHECK(!shape.IsSliced());
}
if (shape.encoding_tag() == kOneByteStringTag) {
const uint8_t* start;
if (shape.representation_tag() == kSeqStringTag) {
start = SeqOneByteString::cast(string)->GetChars();
} else {
start = ExternalOneByteString::cast(string)->GetChars();
}
return FlatContent(start + offset, length);
} else {
DCHECK(shape.encoding_tag() == kTwoByteStringTag);
const uc16* start;
if (shape.representation_tag() == kSeqStringTag) {
start = SeqTwoByteString::cast(string)->GetChars();
} else {
start = ExternalTwoByteString::cast(string)->GetChars();
}
return FlatContent(start + offset, length);
}
}
std::unique_ptr<char[]> String::ToCString(AllowNullsFlag allow_nulls,
RobustnessFlag robust_flag,
int offset, int length,
int* length_return) {
if (robust_flag == ROBUST_STRING_TRAVERSAL && !LooksValid()) {
return std::unique_ptr<char[]>();
}
// Negative length means the to the end of the string.
if (length < 0) length = kMaxInt - offset;
// Compute the size of the UTF-8 string. Start at the specified offset.
StringCharacterStream stream(this, offset);
int character_position = offset;
int utf8_bytes = 0;
int last = unibrow::Utf16::kNoPreviousCharacter;
while (stream.HasMore() && character_position++ < offset + length) {
uint16_t character = stream.GetNext();
utf8_bytes += unibrow::Utf8::Length(character, last);
last = character;
}
if (length_return) {
*length_return = utf8_bytes;
}
char* result = NewArray<char>(utf8_bytes + 1);
// Convert the UTF-16 string to a UTF-8 buffer. Start at the specified offset.
stream.Reset(this, offset);
character_position = offset;
int utf8_byte_position = 0;
last = unibrow::Utf16::kNoPreviousCharacter;
while (stream.HasMore() && character_position++ < offset + length) {
uint16_t character = stream.GetNext();
if (allow_nulls == DISALLOW_NULLS && character == 0) {
character = ' ';
}
utf8_byte_position +=
unibrow::Utf8::Encode(result + utf8_byte_position, character, last);
last = character;
}
result[utf8_byte_position] = 0;
return std::unique_ptr<char[]>(result);
}
std::unique_ptr<char[]> String::ToCString(AllowNullsFlag allow_nulls,
RobustnessFlag robust_flag,
int* length_return) {
return ToCString(allow_nulls, robust_flag, 0, -1, length_return);
}
const uc16* String::GetTwoByteData(unsigned start) {
DCHECK(!IsOneByteRepresentationUnderneath());
switch (StringShape(this).representation_tag()) {
case kSeqStringTag:
return SeqTwoByteString::cast(this)->SeqTwoByteStringGetData(start);
case kExternalStringTag:
return ExternalTwoByteString::cast(this)->
ExternalTwoByteStringGetData(start);
case kSlicedStringTag: {
SlicedString* slice = SlicedString::cast(this);
return slice->parent()->GetTwoByteData(start + slice->offset());
}
case kConsStringTag:
case kThinStringTag:
UNREACHABLE();
return NULL;
}
UNREACHABLE();
return NULL;
}
const uc16* SeqTwoByteString::SeqTwoByteStringGetData(unsigned start) {
return reinterpret_cast<uc16*>(
reinterpret_cast<char*>(this) - kHeapObjectTag + kHeaderSize) + start;
}
void Relocatable::PostGarbageCollectionProcessing(Isolate* isolate) {
Relocatable* current = isolate->relocatable_top();
while (current != NULL) {
current->PostGarbageCollection();
current = current->prev_;
}
}
// Reserve space for statics needing saving and restoring.
int Relocatable::ArchiveSpacePerThread() {
return sizeof(Relocatable*); // NOLINT
}
// Archive statics that are thread-local.
char* Relocatable::ArchiveState(Isolate* isolate, char* to) {
*reinterpret_cast<Relocatable**>(to) = isolate->relocatable_top();
isolate->set_relocatable_top(NULL);
return to + ArchiveSpacePerThread();
}
// Restore statics that are thread-local.
char* Relocatable::RestoreState(Isolate* isolate, char* from) {
isolate->set_relocatable_top(*reinterpret_cast<Relocatable**>(from));
return from + ArchiveSpacePerThread();
}
char* Relocatable::Iterate(ObjectVisitor* v, char* thread_storage) {
Relocatable* top = *reinterpret_cast<Relocatable**>(thread_storage);
Iterate(v, top);
return thread_storage + ArchiveSpacePerThread();
}
void Relocatable::Iterate(Isolate* isolate, ObjectVisitor* v) {
Iterate(v, isolate->relocatable_top());
}
void Relocatable::Iterate(ObjectVisitor* v, Relocatable* top) {
Relocatable* current = top;
while (current != NULL) {
current->IterateInstance(v);
current = current->prev_;
}
}
FlatStringReader::FlatStringReader(Isolate* isolate, Handle<String> str)
: Relocatable(isolate),
str_(str.location()),
length_(str->length()) {
PostGarbageCollection();
}
FlatStringReader::FlatStringReader(Isolate* isolate, Vector<const char> input)
: Relocatable(isolate),
str_(0),
is_one_byte_(true),
length_(input.length()),
start_(input.start()) {}
void FlatStringReader::PostGarbageCollection() {
if (str_ == NULL) return;
Handle<String> str(str_);
DCHECK(str->IsFlat());
DisallowHeapAllocation no_gc;
// This does not actually prevent the vector from being relocated later.
String::FlatContent content = str->GetFlatContent();
DCHECK(content.IsFlat());
is_one_byte_ = content.IsOneByte();
if (is_one_byte_) {
start_ = content.ToOneByteVector().start();
} else {
start_ = content.ToUC16Vector().start();
}
}
void ConsStringIterator::Initialize(ConsString* cons_string, int offset) {
DCHECK(cons_string != NULL);
root_ = cons_string;
consumed_ = offset;
// Force stack blown condition to trigger restart.
depth_ = 1;
maximum_depth_ = kStackSize + depth_;
DCHECK(StackBlown());
}
String* ConsStringIterator::Continue(int* offset_out) {
DCHECK(depth_ != 0);
DCHECK_EQ(0, *offset_out);
bool blew_stack = StackBlown();
String* string = NULL;
// Get the next leaf if there is one.
if (!blew_stack) string = NextLeaf(&blew_stack);
// Restart search from root.
if (blew_stack) {
DCHECK(string == NULL);
string = Search(offset_out);
}
// Ensure future calls return null immediately.
if (string == NULL) Reset(NULL);
return string;
}
String* ConsStringIterator::Search(int* offset_out) {
ConsString* cons_string = root_;
// Reset the stack, pushing the root string.
depth_ = 1;
maximum_depth_ = 1;
frames_[0] = cons_string;
const int consumed = consumed_;
int offset = 0;
while (true) {
// Loop until the string is found which contains the target offset.
String* string = cons_string->first();
int length = string->length();
int32_t type;
if (consumed < offset + length) {
// Target offset is in the left branch.
// Keep going if we're still in a ConString.
type = string->map()->instance_type();
if ((type & kStringRepresentationMask) == kConsStringTag) {
cons_string = ConsString::cast(string);
PushLeft(cons_string);
continue;
}
// Tell the stack we're done descending.
AdjustMaximumDepth();
} else {
// Descend right.
// Update progress through the string.
offset += length;
// Keep going if we're still in a ConString.
string = cons_string->second();
type = string->map()->instance_type();
if ((type & kStringRepresentationMask) == kConsStringTag) {
cons_string = ConsString::cast(string);
PushRight(cons_string);
continue;
}
// Need this to be updated for the current string.
length = string->length();
// Account for the possibility of an empty right leaf.
// This happens only if we have asked for an offset outside the string.
if (length == 0) {
// Reset so future operations will return null immediately.
Reset(NULL);
return NULL;
}
// Tell the stack we're done descending.
AdjustMaximumDepth();
// Pop stack so next iteration is in correct place.
Pop();
}
DCHECK(length != 0);
// Adjust return values and exit.
consumed_ = offset + length;
*offset_out = consumed - offset;
return string;
}
UNREACHABLE();
return NULL;
}
String* ConsStringIterator::NextLeaf(bool* blew_stack) {
while (true) {
// Tree traversal complete.
if (depth_ == 0) {
*blew_stack = false;
return NULL;
}
// We've lost track of higher nodes.
if (StackBlown()) {
*blew_stack = true;
return NULL;
}
// Go right.
ConsString* cons_string = frames_[OffsetForDepth(depth_ - 1)];
String* string = cons_string->second();
int32_t type = string->map()->instance_type();
if ((type & kStringRepresentationMask) != kConsStringTag) {
// Pop stack so next iteration is in correct place.
Pop();
int length = string->length();
// Could be a flattened ConsString.
if (length == 0) continue;
consumed_ += length;
return string;
}
cons_string = ConsString::cast(string);
PushRight(cons_string);
// Need to traverse all the way left.
while (true) {
// Continue left.
string = cons_string->first();
type = string->map()->instance_type();
if ((type & kStringRepresentationMask) != kConsStringTag) {
AdjustMaximumDepth();
int length = string->length();
if (length == 0) break; // Skip empty left-hand sides of ConsStrings.
consumed_ += length;
return string;
}
cons_string = ConsString::cast(string);
PushLeft(cons_string);
}
}
UNREACHABLE();
return NULL;
}
uint16_t ConsString::ConsStringGet(int index) {
DCHECK(index >= 0 && index < this->length());
// Check for a flattened cons string
if (second()->length() == 0) {
String* left = first();
return left->Get(index);
}
String* string = String::cast(this);
while (true) {
if (StringShape(string).IsCons()) {
ConsString* cons_string = ConsString::cast(string);
String* left = cons_string->first();
if (left->length() > index) {
string = left;
} else {
index -= left->length();
string = cons_string->second();
}
} else {
return string->Get(index);
}
}
UNREACHABLE();
return 0;
}
uint16_t ThinString::ThinStringGet(int index) { return actual()->Get(index); }
uint16_t SlicedString::SlicedStringGet(int index) {
return parent()->Get(offset() + index);
}
template <typename sinkchar>
void String::WriteToFlat(String* src,
sinkchar* sink,
int f,
int t) {
String* source = src;
int from = f;
int to = t;
while (true) {
DCHECK(0 <= from && from <= to && to <= source->length());
switch (StringShape(source).full_representation_tag()) {
case kOneByteStringTag | kExternalStringTag: {
CopyChars(sink, ExternalOneByteString::cast(source)->GetChars() + from,
to - from);
return;
}
case kTwoByteStringTag | kExternalStringTag: {
const uc16* data =
ExternalTwoByteString::cast(source)->GetChars();
CopyChars(sink,
data + from,
to - from);
return;
}
case kOneByteStringTag | kSeqStringTag: {
CopyChars(sink,
SeqOneByteString::cast(source)->GetChars() + from,
to - from);
return;
}
case kTwoByteStringTag | kSeqStringTag: {
CopyChars(sink,
SeqTwoByteString::cast(source)->GetChars() + from,
to - from);
return;
}
case kOneByteStringTag | kConsStringTag:
case kTwoByteStringTag | kConsStringTag: {
ConsString* cons_string = ConsString::cast(source);
String* first = cons_string->first();
int boundary = first->length();
if (to - boundary >= boundary - from) {
// Right hand side is longer. Recurse over left.
if (from < boundary) {
WriteToFlat(first, sink, from, boundary);
if (from == 0 && cons_string->second() == first) {
CopyChars(sink + boundary, sink, boundary);
return;
}
sink += boundary - from;
from = 0;
} else {
from -= boundary;
}
to -= boundary;
source = cons_string->second();
} else {
// Left hand side is longer. Recurse over right.
if (to > boundary) {
String* second = cons_string->second();
// When repeatedly appending to a string, we get a cons string that
// is unbalanced to the left, a list, essentially. We inline the
// common case of sequential one-byte right child.
if (to - boundary == 1) {
sink[boundary - from] = static_cast<sinkchar>(second->Get(0));
} else if (second->IsSeqOneByteString()) {
CopyChars(sink + boundary - from,
SeqOneByteString::cast(second)->GetChars(),
to - boundary);
} else {
WriteToFlat(second,
sink + boundary - from,
0,
to - boundary);
}
to = boundary;
}
source = first;
}
break;
}
case kOneByteStringTag | kSlicedStringTag:
case kTwoByteStringTag | kSlicedStringTag: {
SlicedString* slice = SlicedString::cast(source);
unsigned offset = slice->offset();
WriteToFlat(slice->parent(), sink, from + offset, to + offset);
return;
}
case kOneByteStringTag | kThinStringTag:
case kTwoByteStringTag | kThinStringTag:
source = ThinString::cast(source)->actual();
break;
}
}
}
template <typename SourceChar>
static void CalculateLineEndsImpl(Isolate* isolate,
List<int>* line_ends,
Vector<const SourceChar> src,
bool include_ending_line) {
const int src_len = src.length();
UnicodeCache* cache = isolate->unicode_cache();
for (int i = 0; i < src_len - 1; i++) {
SourceChar current = src[i];
SourceChar next = src[i + 1];
if (cache->IsLineTerminatorSequence(current, next)) line_ends->Add(i);
}
if (src_len > 0 && cache->IsLineTerminatorSequence(src[src_len - 1], 0)) {
line_ends->Add(src_len - 1);
}
if (include_ending_line) {
// Include one character beyond the end of script. The rewriter uses that
// position for the implicit return statement.
line_ends->Add(src_len);
}
}
Handle<FixedArray> String::CalculateLineEnds(Handle<String> src,
bool include_ending_line) {
src = Flatten(src);
// Rough estimate of line count based on a roughly estimated average
// length of (unpacked) code.
int line_count_estimate = src->length() >> 4;
List<int> line_ends(line_count_estimate);
Isolate* isolate = src->GetIsolate();
{ DisallowHeapAllocation no_allocation; // ensure vectors stay valid.
// Dispatch on type of strings.
String::FlatContent content = src->GetFlatContent();
DCHECK(content.IsFlat());
if (content.IsOneByte()) {
CalculateLineEndsImpl(isolate,
&line_ends,
content.ToOneByteVector(),
include_ending_line);
} else {
CalculateLineEndsImpl(isolate,
&line_ends,
content.ToUC16Vector(),
include_ending_line);
}
}
int line_count = line_ends.length();
Handle<FixedArray> array = isolate->factory()->NewFixedArray(line_count);
for (int i = 0; i < line_count; i++) {
array->set(i, Smi::FromInt(line_ends[i]));
}
return array;
}
// Compares the contents of two strings by reading and comparing
// int-sized blocks of characters.
template <typename Char>
static inline bool CompareRawStringContents(const Char* const a,
const Char* const b,
int length) {
return CompareChars(a, b, length) == 0;
}
template<typename Chars1, typename Chars2>
class RawStringComparator : public AllStatic {
public:
static inline bool compare(const Chars1* a, const Chars2* b, int len) {
DCHECK(sizeof(Chars1) != sizeof(Chars2));
for (int i = 0; i < len; i++) {
if (a[i] != b[i]) {
return false;
}
}
return true;
}
};
template<>
class RawStringComparator<uint16_t, uint16_t> {
public:
static inline bool compare(const uint16_t* a, const uint16_t* b, int len) {
return CompareRawStringContents(a, b, len);
}
};
template<>
class RawStringComparator<uint8_t, uint8_t> {
public:
static inline bool compare(const uint8_t* a, const uint8_t* b, int len) {
return CompareRawStringContents(a, b, len);
}
};
class StringComparator {
class State {
public:
State() : is_one_byte_(true), length_(0), buffer8_(NULL) {}
void Init(String* string) {
ConsString* cons_string = String::VisitFlat(this, string);
iter_.Reset(cons_string);
if (cons_string != NULL) {
int offset;
string = iter_.Next(&offset);
String::VisitFlat(this, string, offset);
}
}
inline void VisitOneByteString(const uint8_t* chars, int length) {
is_one_byte_ = true;
buffer8_ = chars;
length_ = length;
}
inline void VisitTwoByteString(const uint16_t* chars, int length) {
is_one_byte_ = false;
buffer16_ = chars;
length_ = length;
}
void Advance(int consumed) {
DCHECK(consumed <= length_);
// Still in buffer.
if (length_ != consumed) {
if (is_one_byte_) {
buffer8_ += consumed;
} else {
buffer16_ += consumed;
}
length_ -= consumed;
return;
}
// Advance state.
int offset;
String* next = iter_.Next(&offset);
DCHECK_EQ(0, offset);
DCHECK(next != NULL);
String::VisitFlat(this, next);
}
ConsStringIterator iter_;
bool is_one_byte_;
int length_;
union {
const uint8_t* buffer8_;
const uint16_t* buffer16_;
};
private:
DISALLOW_COPY_AND_ASSIGN(State);
};
public:
inline StringComparator() {}
template<typename Chars1, typename Chars2>
static inline bool Equals(State* state_1, State* state_2, int to_check) {
const Chars1* a = reinterpret_cast<const Chars1*>(state_1->buffer8_);
const Chars2* b = reinterpret_cast<const Chars2*>(state_2->buffer8_);
return RawStringComparator<Chars1, Chars2>::compare(a, b, to_check);
}
bool Equals(String* string_1, String* string_2) {
int length = string_1->length();
state_1_.Init(string_1);
state_2_.Init(string_2);
while (true) {
int to_check = Min(state_1_.length_, state_2_.length_);
DCHECK(to_check > 0 && to_check <= length);
bool is_equal;
if (state_1_.is_one_byte_) {
if (state_2_.is_one_byte_) {
is_equal = Equals<uint8_t, uint8_t>(&state_1_, &state_2_, to_check);
} else {
is_equal = Equals<uint8_t, uint16_t>(&state_1_, &state_2_, to_check);
}
} else {
if (state_2_.is_one_byte_) {
is_equal = Equals<uint16_t, uint8_t>(&state_1_, &state_2_, to_check);
} else {
is_equal = Equals<uint16_t, uint16_t>(&state_1_, &state_2_, to_check);
}
}
// Looping done.
if (!is_equal) return false;
length -= to_check;
// Exit condition. Strings are equal.
if (length == 0) return true;
state_1_.Advance(to_check);
state_2_.Advance(to_check);
}
}
private:
State state_1_;
State state_2_;
DISALLOW_COPY_AND_ASSIGN(StringComparator);
};
bool String::SlowEquals(String* other) {
DisallowHeapAllocation no_gc;
// Fast check: negative check with lengths.
int len = length();
if (len != other->length()) return false;
if (len == 0) return true;
// Fast check: if at least one ThinString is involved, dereference it/them
// and restart.
if (this->IsThinString() || other->IsThinString()) {
if (other->IsThinString()) other = ThinString::cast(other)->actual();
if (this->IsThinString()) {
return ThinString::cast(this)->actual()->Equals(other);
} else {
return this->Equals(other);
}
}
// Fast check: if hash code is computed for both strings
// a fast negative check can be performed.
if (HasHashCode() && other->HasHashCode()) {
#ifdef ENABLE_SLOW_DCHECKS
if (FLAG_enable_slow_asserts) {
if (Hash() != other->Hash()) {
bool found_difference = false;
for (int i = 0; i < len; i++) {
if (Get(i) != other->Get(i)) {
found_difference = true;
break;
}
}
DCHECK(found_difference);
}
}
#endif
if (Hash() != other->Hash()) return false;
}
// We know the strings are both non-empty. Compare the first chars
// before we try to flatten the strings.
if (this->Get(0) != other->Get(0)) return false;
if (IsSeqOneByteString() && other->IsSeqOneByteString()) {
const uint8_t* str1 = SeqOneByteString::cast(this)->GetChars();
const uint8_t* str2 = SeqOneByteString::cast(other)->GetChars();
return CompareRawStringContents(str1, str2, len);
}
StringComparator comparator;
return comparator.Equals(this, other);
}
bool String::SlowEquals(Handle<String> one, Handle<String> two) {
// Fast check: negative check with lengths.
int one_length = one->length();
if (one_length != two->length()) return false;
if (one_length == 0) return true;
// Fast check: if at least one ThinString is involved, dereference it/them
// and restart.
if (one->IsThinString() || two->IsThinString()) {
if (one->IsThinString()) one = handle(ThinString::cast(*one)->actual());
if (two->IsThinString()) two = handle(ThinString::cast(*two)->actual());
return String::Equals(one, two);
}
// Fast check: if hash code is computed for both strings
// a fast negative check can be performed.
if (one->HasHashCode() && two->HasHashCode()) {
#ifdef ENABLE_SLOW_DCHECKS
if (FLAG_enable_slow_asserts) {
if (one->Hash() != two->Hash()) {
bool found_difference = false;
for (int i = 0; i < one_length; i++) {
if (one->Get(i) != two->Get(i)) {
found_difference = true;
break;
}
}
DCHECK(found_difference);
}
}
#endif
if (one->Hash() != two->Hash()) return false;
}
// We know the strings are both non-empty. Compare the first chars
// before we try to flatten the strings.
if (one->Get(0) != two->Get(0)) return false;
one = String::Flatten(one);
two = String::Flatten(two);
DisallowHeapAllocation no_gc;
String::FlatContent flat1 = one->GetFlatContent();
String::FlatContent flat2 = two->GetFlatContent();
if (flat1.IsOneByte() && flat2.IsOneByte()) {
return CompareRawStringContents(flat1.ToOneByteVector().start(),
flat2.ToOneByteVector().start(),
one_length);
} else {
for (int i = 0; i < one_length; i++) {
if (flat1.Get(i) != flat2.Get(i)) return false;
}
return true;
}
}
// static
ComparisonResult String::Compare(Handle<String> x, Handle<String> y) {
// A few fast case tests before we flatten.
if (x.is_identical_to(y)) {
return ComparisonResult::kEqual;
} else if (y->length() == 0) {
return x->length() == 0 ? ComparisonResult::kEqual
: ComparisonResult::kGreaterThan;
} else if (x->length() == 0) {
return ComparisonResult::kLessThan;
}
int const d = x->Get(0) - y->Get(0);
if (d < 0) {
return ComparisonResult::kLessThan;
} else if (d > 0) {
return ComparisonResult::kGreaterThan;
}
// Slow case.
x = String::Flatten(x);
y = String::Flatten(y);
DisallowHeapAllocation no_gc;
ComparisonResult result = ComparisonResult::kEqual;
int prefix_length = x->length();
if (y->length() < prefix_length) {
prefix_length = y->length();
result = ComparisonResult::kGreaterThan;
} else if (y->length() > prefix_length) {
result = ComparisonResult::kLessThan;
}
int r;
String::FlatContent x_content = x->GetFlatContent();
String::FlatContent y_content = y->GetFlatContent();
if (x_content.IsOneByte()) {
Vector<const uint8_t> x_chars = x_content.ToOneByteVector();
if (y_content.IsOneByte()) {
Vector<const uint8_t> y_chars = y_content.ToOneByteVector();
r = CompareChars(x_chars.start(), y_chars.start(), prefix_length);
} else {
Vector<const uc16> y_chars = y_content.ToUC16Vector();
r = CompareChars(x_chars.start(), y_chars.start(), prefix_length);
}
} else {
Vector<const uc16> x_chars = x_content.ToUC16Vector();
if (y_content.IsOneByte()) {
Vector<const uint8_t> y_chars = y_content.ToOneByteVector();
r = CompareChars(x_chars.start(), y_chars.start(), prefix_length);
} else {
Vector<const uc16> y_chars = y_content.ToUC16Vector();
r = CompareChars(x_chars.start(), y_chars.start(), prefix_length);
}
}
if (r < 0) {
result = ComparisonResult::kLessThan;
} else if (r > 0) {
result = ComparisonResult::kGreaterThan;
}
return result;
}
Object* String::IndexOf(Isolate* isolate, Handle<Object> receiver,
Handle<Object> search, Handle<Object> position) {
if (receiver->IsNullOrUndefined(isolate)) {
THROW_NEW_ERROR_RETURN_FAILURE(
isolate, NewTypeError(MessageTemplate::kCalledOnNullOrUndefined,
isolate->factory()->NewStringFromAsciiChecked(
"String.prototype.indexOf")));
}
Handle<String> receiver_string;
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, receiver_string,
Object::ToString(isolate, receiver));
Handle<String> search_string;
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, search_string,
Object::ToString(isolate, search));
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, position,
Object::ToInteger(isolate, position));
uint32_t index = receiver_string->ToValidIndex(*position);
return Smi::FromInt(
String::IndexOf(isolate, receiver_string, search_string, index));
}
namespace {
template <typename T>
int SearchString(Isolate* isolate, String::FlatContent receiver_content,
Vector<T> pat_vector, int start_index) {
if (receiver_content.IsOneByte()) {
return SearchString(isolate, receiver_content.ToOneByteVector(), pat_vector,
start_index);
}
return SearchString(isolate, receiver_content.ToUC16Vector(), pat_vector,
start_index);
}
} // namespace
int String::IndexOf(Isolate* isolate, Handle<String> receiver,
Handle<String> search, int start_index) {
DCHECK(0 <= start_index);
DCHECK(start_index <= receiver->length());
uint32_t search_length = search->length();
if (search_length == 0) return start_index;
uint32_t receiver_length = receiver->length();
if (start_index + search_length > receiver_length) return -1;
receiver = String::Flatten(receiver);
search = String::Flatten(search);
DisallowHeapAllocation no_gc; // ensure vectors stay valid
// Extract flattened substrings of cons strings before getting encoding.
String::FlatContent receiver_content = receiver->GetFlatContent();
String::FlatContent search_content = search->GetFlatContent();
// dispatch on type of strings
if (search_content.IsOneByte()) {
Vector<const uint8_t> pat_vector = search_content.ToOneByteVector();
return SearchString<const uint8_t>(isolate, receiver_content, pat_vector,
start_index);
}
Vector<const uc16> pat_vector = search_content.ToUC16Vector();
return SearchString<const uc16>(isolate, receiver_content, pat_vector,
start_index);
}
MaybeHandle<String> String::GetSubstitution(Isolate* isolate, Match* match,
Handle<String> replacement) {
Factory* factory = isolate->factory();
const int replacement_length = replacement->length();
const int captures_length = match->CaptureCount();
replacement = String::Flatten(replacement);
Handle<String> dollar_string =
factory->LookupSingleCharacterStringFromCode('$');
int next = String::IndexOf(isolate, replacement, dollar_string, 0);
if (next < 0) {
return replacement;
}
IncrementalStringBuilder builder(isolate);
if (next > 0) {
builder.AppendString(factory->NewSubString(replacement, 0, next));
}
while (true) {
int pos = next + 1;
if (pos < replacement_length) {
const uint16_t peek = replacement->Get(pos);
if (peek == '$') { // $$
pos++;
builder.AppendCharacter('$');
} else if (peek == '&') { // $& - match
pos++;
builder.AppendString(match->GetMatch());
} else if (peek == '`') { // $` - prefix
pos++;
builder.AppendString(match->GetPrefix());
} else if (peek == '\'') { // $' - suffix
pos++;
builder.AppendString(match->GetSuffix());
} else if (peek >= '0' && peek <= '9') {
// Valid indices are $1 .. $9, $01 .. $09 and $10 .. $99
int scaled_index = (peek - '0');
int advance = 1;
if (pos + 1 < replacement_length) {
const uint16_t next_peek = replacement->Get(pos + 1);
if (next_peek >= '0' && next_peek <= '9') {
const int new_scaled_index = scaled_index * 10 + (next_peek - '0');
if (new_scaled_index < captures_length) {
scaled_index = new_scaled_index;
advance = 2;
}
}
}
if (scaled_index != 0 && scaled_index < captures_length) {
bool capture_exists;
Handle<String> capture;
ASSIGN_RETURN_ON_EXCEPTION(
isolate, capture,
match->GetCapture(scaled_index, &capture_exists), String);
if (capture_exists) builder.AppendString(capture);
pos += advance;
} else {
builder.AppendCharacter('$');
}
} else {
builder.AppendCharacter('$');
}
} else {
builder.AppendCharacter('$');
}
// Go the the next $ in the replacement.
next = String::IndexOf(isolate, replacement, dollar_string, pos);
// Return if there are no more $ characters in the replacement. If we
// haven't reached the end, we need to append the suffix.
if (next < 0) {
if (pos < replacement_length) {
builder.AppendString(
factory->NewSubString(replacement, pos, replacement_length));
}
return builder.Finish();
}
// Append substring between the previous and the next $ character.
if (next > pos) {
builder.AppendString(factory->NewSubString(replacement, pos, next));
}
}
UNREACHABLE();
return MaybeHandle<String>();
}
namespace { // for String.Prototype.lastIndexOf
template <typename schar, typename pchar>
int StringMatchBackwards(Vector<const schar> subject,
Vector<const pchar> pattern, int idx) {
int pattern_length = pattern.length();
DCHECK(pattern_length >= 1);
DCHECK(idx + pattern_length <= subject.length());
if (sizeof(schar) == 1 && sizeof(pchar) > 1) {
for (int i = 0; i < pattern_length; i++) {
uc16 c = pattern[i];
if (c > String::kMaxOneByteCharCode) {
return -1;
}
}
}
pchar pattern_first_char = pattern[0];
for (int i = idx; i >= 0; i--) {
if (subject[i] != pattern_first_char) continue;
int j = 1;
while (j < pattern_length) {
if (pattern[j] != subject[i + j]) {
break;
}
j++;
}
if (j == pattern_length) {
return i;
}
}
return -1;
}
} // namespace
Object* String::LastIndexOf(Isolate* isolate, Handle<Object> receiver,
Handle<Object> search, Handle<Object> position) {
if (receiver->IsNullOrUndefined(isolate)) {
THROW_NEW_ERROR_RETURN_FAILURE(
isolate, NewTypeError(MessageTemplate::kCalledOnNullOrUndefined,
isolate->factory()->NewStringFromAsciiChecked(
"String.prototype.lastIndexOf")));
}
Handle<String> receiver_string;
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, receiver_string,
Object::ToString(isolate, receiver));
Handle<String> search_string;
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, search_string,
Object::ToString(isolate, search));
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, position,
Object::ToNumber(position));
uint32_t start_index;
if (position->IsNaN()) {
start_index = receiver_string->length();
} else {
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, position,
Object::ToInteger(isolate, position));
start_index = receiver_string->ToValidIndex(*position);
}
uint32_t pattern_length = search_string->length();
uint32_t receiver_length = receiver_string->length();
if (start_index + pattern_length > receiver_length) {
start_index = receiver_length - pattern_length;
}
if (pattern_length == 0) {
return Smi::FromInt(start_index);
}
receiver_string = String::Flatten(receiver_string);
search_string = String::Flatten(search_string);
int last_index = -1;
DisallowHeapAllocation no_gc; // ensure vectors stay valid
String::FlatContent receiver_content = receiver_string->GetFlatContent();
String::FlatContent search_content = search_string->GetFlatContent();
if (search_content.IsOneByte()) {
Vector<const uint8_t> pat_vector = search_content.ToOneByteVector();
if (receiver_content.IsOneByte()) {
last_index = StringMatchBackwards(receiver_content.ToOneByteVector(),
pat_vector, start_index);
} else {
last_index = StringMatchBackwards(receiver_content.ToUC16Vector(),
pat_vector, start_index);
}
} else {
Vector<const uc16> pat_vector = search_content.ToUC16Vector();
if (receiver_content.IsOneByte()) {
last_index = StringMatchBackwards(receiver_content.ToOneByteVector(),
pat_vector, start_index);
} else {
last_index = StringMatchBackwards(receiver_content.ToUC16Vector(),
pat_vector, start_index);
}
}
return Smi::FromInt(last_index);
}
bool String::IsUtf8EqualTo(Vector<const char> str, bool allow_prefix_match) {
int slen = length();
// Can't check exact length equality, but we can check bounds.
int str_len = str.length();
if (!allow_prefix_match &&
(str_len < slen ||
str_len > slen*static_cast<int>(unibrow::Utf8::kMaxEncodedSize))) {
return false;
}
int i;
size_t remaining_in_str = static_cast<size_t>(str_len);
const uint8_t* utf8_data = reinterpret_cast<const uint8_t*>(str.start());
for (i = 0; i < slen && remaining_in_str > 0; i++) {
size_t cursor = 0;
uint32_t r = unibrow::Utf8::ValueOf(utf8_data, remaining_in_str, &cursor);
DCHECK(cursor > 0 && cursor <= remaining_in_str);
if (r > unibrow::Utf16::kMaxNonSurrogateCharCode) {
if (i > slen - 1) return false;
if (Get(i++) != unibrow::Utf16::LeadSurrogate(r)) return false;
if (Get(i) != unibrow::Utf16::TrailSurrogate(r)) return false;
} else {
if (Get(i) != r) return false;
}
utf8_data += cursor;
remaining_in_str -= cursor;
}
return (allow_prefix_match || i == slen) && remaining_in_str == 0;
}
bool String::IsOneByteEqualTo(Vector<const uint8_t> str) {
int slen = length();
if (str.length() != slen) return false;
DisallowHeapAllocation no_gc;
FlatContent content = GetFlatContent();
if (content.IsOneByte()) {
return CompareChars(content.ToOneByteVector().start(),
str.start(), slen) == 0;
}
for (int i = 0; i < slen; i++) {
if (Get(i) != static_cast<uint16_t>(str[i])) return false;
}
return true;
}
bool String::IsTwoByteEqualTo(Vector<const uc16> str) {
int slen = length();
if (str.length() != slen) return false;
DisallowHeapAllocation no_gc;
FlatContent content = GetFlatContent();
if (content.IsTwoByte()) {
return CompareChars(content.ToUC16Vector().start(), str.start(), slen) == 0;
}
for (int i = 0; i < slen; i++) {
if (Get(i) != str[i]) return false;
}
return true;
}
uint32_t String::ComputeAndSetHash() {
// Should only be called if hash code has not yet been computed.
DCHECK(!HasHashCode());
// Store the hash code in the object.
uint32_t field = IteratingStringHasher::Hash(this, GetHeap()->HashSeed());
set_hash_field(field);
// Check the hash code is there.
DCHECK(HasHashCode());
uint32_t result = field >> kHashShift;
DCHECK(result != 0); // Ensure that the hash value of 0 is never computed.
return result;
}
bool String::ComputeArrayIndex(uint32_t* index) {
int length = this->length();
if (length == 0 || length > kMaxArrayIndexSize) return false;
StringCharacterStream stream(this);
return StringToArrayIndex(&stream, index);
}
bool String::SlowAsArrayIndex(uint32_t* index) {
if (length() <= kMaxCachedArrayIndexLength) {
Hash(); // force computation of hash code
uint32_t field = hash_field();
if ((field & kIsNotArrayIndexMask) != 0) return false;
// Isolate the array index form the full hash field.
*index = ArrayIndexValueBits::decode(field);
return true;
} else {
return ComputeArrayIndex(index);
}
}
Handle<String> SeqString::Truncate(Handle<SeqString> string, int new_length) {
Heap* heap = string->GetHeap();
if (new_length == 0) return heap->isolate()->factory()->empty_string();
int new_size, old_size;
int old_length = string->length();
if (old_length <= new_length) return string;
if (string->IsSeqOneByteString()) {
old_size = SeqOneByteString::SizeFor(old_length);
new_size = SeqOneByteString::SizeFor(new_length);
} else {
DCHECK(string->IsSeqTwoByteString());
old_size = SeqTwoByteString::SizeFor(old_length);
new_size = SeqTwoByteString::SizeFor(new_length);
}
int delta = old_size - new_size;
Address start_of_string = string->address();
DCHECK_OBJECT_ALIGNED(start_of_string);
DCHECK_OBJECT_ALIGNED(start_of_string + new_size);
// Sizes are pointer size aligned, so that we can use filler objects
// that are a multiple of pointer size.
heap->CreateFillerObjectAt(start_of_string + new_size, delta,
ClearRecordedSlots::kNo);
heap->AdjustLiveBytes(*string, -delta);
// We are storing the new length using release store after creating a filler
// for the left-over space to avoid races with the sweeper thread.
string->synchronized_set_length(new_length);
return string;
}
uint32_t StringHasher::MakeArrayIndexHash(uint32_t value, int length) {
// For array indexes mix the length into the hash as an array index could
// be zero.
DCHECK(length > 0);
DCHECK(length <= String::kMaxArrayIndexSize);
DCHECK(TenToThe(String::kMaxCachedArrayIndexLength) <
(1 << String::kArrayIndexValueBits));
value <<= String::ArrayIndexValueBits::kShift;
value |= length << String::ArrayIndexLengthBits::kShift;
DCHECK((value & String::kIsNotArrayIndexMask) == 0);
DCHECK_EQ(length <= String::kMaxCachedArrayIndexLength,
(value & String::kContainsCachedArrayIndexMask) == 0);
return value;
}
uint32_t StringHasher::GetHashField() {
if (length_ <= String::kMaxHashCalcLength) {
if (is_array_index_) {
return MakeArrayIndexHash(array_index_, length_);
}
return (GetHashCore(raw_running_hash_) << String::kHashShift) |
String::kIsNotArrayIndexMask;
} else {
return (length_ << String::kHashShift) | String::kIsNotArrayIndexMask;
}
}
uint32_t StringHasher::ComputeUtf8Hash(Vector<const char> chars,
uint32_t seed,
int* utf16_length_out) {
int vector_length = chars.length();
// Handle some edge cases
if (vector_length <= 1) {
DCHECK(vector_length == 0 ||
static_cast<uint8_t>(chars.start()[0]) <=
unibrow::Utf8::kMaxOneByteChar);
*utf16_length_out = vector_length;
return HashSequentialString(chars.start(), vector_length, seed);
}
// Start with a fake length which won't affect computation.
// It will be updated later.
StringHasher hasher(String::kMaxArrayIndexSize, seed);
size_t remaining = static_cast<size_t>(vector_length);
const uint8_t* stream = reinterpret_cast<const uint8_t*>(chars.start());
int utf16_length = 0;
bool is_index = true;
DCHECK(hasher.is_array_index_);
while (remaining > 0) {
size_t consumed = 0;
uint32_t c = unibrow::Utf8::ValueOf(stream, remaining, &consumed);
DCHECK(consumed > 0 && consumed <= remaining);
stream += consumed;
remaining -= consumed;
bool is_two_characters = c > unibrow::Utf16::kMaxNonSurrogateCharCode;
utf16_length += is_two_characters ? 2 : 1;
// No need to keep hashing. But we do need to calculate utf16_length.
if (utf16_length > String::kMaxHashCalcLength) continue;
if (is_two_characters) {
uint16_t c1 = unibrow::Utf16::LeadSurrogate(c);
uint16_t c2 = unibrow::Utf16::TrailSurrogate(c);
hasher.AddCharacter(c1);
hasher.AddCharacter(c2);
if (is_index) is_index = hasher.UpdateIndex(c1);
if (is_index) is_index = hasher.UpdateIndex(c2);
} else {
hasher.AddCharacter(c);
if (is_index) is_index = hasher.UpdateIndex(c);
}
}
*utf16_length_out = static_cast<int>(utf16_length);
// Must set length here so that hash computation is correct.
hasher.length_ = utf16_length;
return hasher.GetHashField();
}
void IteratingStringHasher::VisitConsString(ConsString* cons_string) {
// Run small ConsStrings through ConsStringIterator.
if (cons_string->length() < 64) {
ConsStringIterator iter(cons_string);
int offset;
String* string;
while (nullptr != (string = iter.Next(&offset))) {
DCHECK_EQ(0, offset);
String::VisitFlat(this, string, 0);
}
return;
}
// Slow case.
const int max_length = String::kMaxHashCalcLength;
int length = std::min(cons_string->length(), max_length);
if (cons_string->HasOnlyOneByteChars()) {
uint8_t* buffer = new uint8_t[length];
String::WriteToFlat(cons_string, buffer, 0, length);
AddCharacters(buffer, length);
delete[] buffer;
} else {
uint16_t* buffer = new uint16_t[length];
String::WriteToFlat(cons_string, buffer, 0, length);
AddCharacters(buffer, length);
delete[] buffer;
}
}
void String::PrintOn(FILE* file) {
int length = this->length();
for (int i = 0; i < length; i++) {
PrintF(file, "%c", Get(i));
}
}
int Map::Hash() {
// For performance reasons we only hash the 3 most variable fields of a map:
// constructor, prototype and bit_field2. For predictability reasons we
// use objects' offsets in respective pages for hashing instead of raw
// addresses.
// Shift away the tag.
int hash = ObjectAddressForHashing(GetConstructor()) >> 2;
// XOR-ing the prototype and constructor directly yields too many zero bits
// when the two pointers are close (which is fairly common).
// To avoid this we shift the prototype bits relatively to the constructor.
hash ^= ObjectAddressForHashing(prototype()) << (32 - kPageSizeBits);
return hash ^ (hash >> 16) ^ bit_field2();
}
namespace {
bool CheckEquivalent(Map* first, Map* second) {
return first->GetConstructor() == second->GetConstructor() &&
first->prototype() == second->prototype() &&
first->instance_type() == second->instance_type() &&
first->bit_field() == second->bit_field() &&
first->is_extensible() == second->is_extensible() &&
first->new_target_is_base() == second->new_target_is_base() &&
first->has_hidden_prototype() == second->has_hidden_prototype();
}
} // namespace
bool Map::EquivalentToForTransition(Map* other) {
if (!CheckEquivalent(this, other)) return false;
if (instance_type() == JS_FUNCTION_TYPE) {
// JSFunctions require more checks to ensure that sloppy function is
// not equvalent to strict function.
int nof = Min(NumberOfOwnDescriptors(), other->NumberOfOwnDescriptors());
return instance_descriptors()->IsEqualUpTo(other->instance_descriptors(),
nof);
}
return true;
}
bool Map::EquivalentToForNormalization(Map* other,
PropertyNormalizationMode mode) {
int properties =
mode == CLEAR_INOBJECT_PROPERTIES ? 0 : other->GetInObjectProperties();
return CheckEquivalent(this, other) && bit_field2() == other->bit_field2() &&
GetInObjectProperties() == properties &&
JSObject::GetInternalFieldCount(this) ==
JSObject::GetInternalFieldCount(other);
}
bool JSFunction::Inlines(SharedFunctionInfo* candidate) {
DisallowHeapAllocation no_gc;
if (shared() == candidate) return true;
if (code()->kind() != Code::OPTIMIZED_FUNCTION) return false;
DeoptimizationInputData* const data =
DeoptimizationInputData::cast(code()->deoptimization_data());
if (data->length() == 0) return false;
FixedArray* const literals = data->LiteralArray();
int const inlined_count = data->InlinedFunctionCount()->value();
for (int i = 0; i < inlined_count; ++i) {
if (SharedFunctionInfo::cast(literals->get(i)) == candidate) {
return true;
}
}
return false;
}
void JSFunction::MarkForBaseline() {
Isolate* isolate = GetIsolate();
set_code_no_write_barrier(
isolate->builtins()->builtin(Builtins::kCompileBaseline));
// No write barrier required, since the builtin is part of the root set.
if (FLAG_mark_shared_functions_for_tier_up) {
shared()->set_marked_for_tier_up(true);
}
}
void JSFunction::MarkForOptimization() {
Isolate* isolate = GetIsolate();
DCHECK(!IsOptimized());
DCHECK(shared()->allows_lazy_compilation() ||
!shared()->optimization_disabled());
set_code_no_write_barrier(
isolate->builtins()->builtin(Builtins::kCompileOptimized));
// No write barrier required, since the builtin is part of the root set.
if (FLAG_mark_shared_functions_for_tier_up) {
shared()->set_marked_for_tier_up(true);
}
}
void JSFunction::AttemptConcurrentOptimization() {
Isolate* isolate = GetIsolate();
if (!isolate->concurrent_recompilation_enabled() ||
isolate->bootstrapper()->IsActive()) {
MarkForOptimization();
return;
}
DCHECK(!IsInOptimizationQueue());
DCHECK(!IsOptimized());
DCHECK(shared()->allows_lazy_compilation() ||
!shared()->optimization_disabled());
DCHECK(isolate->concurrent_recompilation_enabled());
if (FLAG_trace_concurrent_recompilation) {
PrintF(" ** Marking ");
ShortPrint();
PrintF(" for concurrent recompilation.\n");
}
set_code_no_write_barrier(
isolate->builtins()->builtin(Builtins::kCompileOptimizedConcurrent));
// No write barrier required, since the builtin is part of the root set.
if (FLAG_mark_shared_functions_for_tier_up) {
// TODO(leszeks): The compilation isn't concurrent if we trigger it using
// this bit.
shared()->set_marked_for_tier_up(true);
}
}
// static
void SharedFunctionInfo::AddToOptimizedCodeMap(
Handle<SharedFunctionInfo> shared, Handle<Context> native_context,
Handle<Code> code, BailoutId osr_ast_id) {
Isolate* isolate = shared->GetIsolate();
if (isolate->serializer_enabled()) return;
DCHECK(code->kind() == Code::OPTIMIZED_FUNCTION);
DCHECK(native_context->IsNativeContext());
STATIC_ASSERT(kEntryLength == 2);
Handle<FixedArray> new_code_map;
int entry;
if (!osr_ast_id.IsNone()) {
Context::AddToOptimizedCodeMap(native_context, shared, code, osr_ast_id);
return;
}
DCHECK(osr_ast_id.IsNone());
if (shared->OptimizedCodeMapIsCleared()) {
new_code_map = isolate->factory()->NewFixedArray(kInitialLength, TENURED);
entry = kEntriesStart;
} else {
Handle<FixedArray> old_code_map(shared->optimized_code_map(), isolate);
entry = shared->SearchOptimizedCodeMapEntry(*native_context);
if (entry >= kEntriesStart) {
// Just set the code of the entry.
Handle<WeakCell> code_cell = isolate->factory()->NewWeakCell(code);
old_code_map->set(entry + kCachedCodeOffset, *code_cell);
return;
}
// Can we reuse an entry?
DCHECK(entry < kEntriesStart);
int length = old_code_map->length();
for (int i = kEntriesStart; i < length; i += kEntryLength) {
if (WeakCell::cast(old_code_map->get(i + kContextOffset))->cleared()) {
new_code_map = old_code_map;
entry = i;
break;
}
}
if (entry < kEntriesStart) {
// Copy old optimized code map and append one new entry.
new_code_map = isolate->factory()->CopyFixedArrayAndGrow(
old_code_map, kEntryLength, TENURED);
// TODO(mstarzinger): Temporary workaround. The allocation above might
// have flushed the optimized code map and the copy we created is full of
// holes. For now we just give up on adding the entry and pretend it got
// flushed.
if (shared->OptimizedCodeMapIsCleared()) return;
entry = old_code_map->length();
}
}
Handle<WeakCell> code_cell = isolate->factory()->NewWeakCell(code);
WeakCell* context_cell = native_context->self_weak_cell();
new_code_map->set(entry + kContextOffset, context_cell);
new_code_map->set(entry + kCachedCodeOffset, *code_cell);
#ifdef DEBUG
for (int i = kEntriesStart; i < new_code_map->length(); i += kEntryLength) {
WeakCell* cell = WeakCell::cast(new_code_map->get(i + kContextOffset));
DCHECK(cell->cleared() || cell->value()->IsNativeContext());
cell = WeakCell::cast(new_code_map->get(i + kCachedCodeOffset));
DCHECK(cell->cleared() ||
(cell->value()->IsCode() &&
Code::cast(cell->value())->kind() == Code::OPTIMIZED_FUNCTION));
}
#endif
FixedArray* old_code_map = shared->optimized_code_map();
if (old_code_map != *new_code_map) {
shared->set_optimized_code_map(*new_code_map);
}
}
void SharedFunctionInfo::ClearOptimizedCodeMap() {
FixedArray* empty_fixed_array = GetHeap()->empty_fixed_array();
set_optimized_code_map(empty_fixed_array, SKIP_WRITE_BARRIER);
}
void SharedFunctionInfo::EvictFromOptimizedCodeMap(Code* optimized_code,
const char* reason) {
DisallowHeapAllocation no_gc;
Isolate* isolate = GetIsolate();
bool found = false;
if (!OptimizedCodeMapIsCleared()) {
Heap* heap = isolate->heap();
FixedArray* code_map = optimized_code_map();
int length = code_map->length();
for (int src = kEntriesStart; src < length; src += kEntryLength) {
DCHECK(WeakCell::cast(code_map->get(src))->cleared() ||
WeakCell::cast(code_map->get(src))->value()->IsNativeContext());
found = WeakCell::cast(code_map->get(src + kCachedCodeOffset))->value() ==
optimized_code;
if (found) {
if (FLAG_trace_opt) {
PrintF("[evicting entry from optimizing code map (%s) for ", reason);
ShortPrint();
PrintF("]\n");
}
// Just clear the code.
code_map->set(src + kCachedCodeOffset, heap->empty_weak_cell(),
SKIP_WRITE_BARRIER);
}
}
}
if (!found) {
// We didn't find the code in here. It must be osr'd code.
isolate->EvictOSROptimizedCode(optimized_code, reason);
}
}
// static
void JSFunction::EnsureLiterals(Handle<JSFunction> function) {
Handle<SharedFunctionInfo> shared(function->shared());
Isolate* isolate = shared->GetIsolate();
FeedbackVectorState state = function->GetFeedbackVectorState(isolate);
switch (state) {
case TOP_LEVEL_SCRIPT_NEEDS_VECTOR: {
// A top level script didn't get it's literals installed.
Handle<FeedbackVector> feedback_vector =
FeedbackVector::New(isolate, shared);
Handle<Cell> new_cell =
isolate->factory()->NewOneClosureCell(feedback_vector);
function->set_feedback_vector_cell(*new_cell);
break;
}
case NEEDS_VECTOR: {
Handle<FeedbackVector> feedback_vector =
FeedbackVector::New(isolate, shared);
function->feedback_vector_cell()->set_value(*feedback_vector);
break;
}
case HAS_VECTOR:
// Nothing to do.
break;
}
}
static void GetMinInobjectSlack(Map* map, void* data) {
int slack = map->unused_property_fields();
if (*reinterpret_cast<int*>(data) > slack) {
*reinterpret_cast<int*>(data) = slack;
}
}
static void ShrinkInstanceSize(Map* map, void* data) {
int slack = *reinterpret_cast<int*>(data);
map->SetInObjectProperties(map->GetInObjectProperties() - slack);
map->set_unused_property_fields(map->unused_property_fields() - slack);
map->set_instance_size(map->instance_size() - slack * kPointerSize);
map->set_construction_counter(Map::kNoSlackTracking);
// Visitor id might depend on the instance size, recalculate it.
map->set_visitor_id(Heap::GetStaticVisitorIdForMap(map));
}
static void StopSlackTracking(Map* map, void* data) {
map->set_construction_counter(Map::kNoSlackTracking);
}
void Map::CompleteInobjectSlackTracking() {
// Has to be an initial map.
DCHECK(GetBackPointer()->IsUndefined(GetIsolate()));
int slack = unused_property_fields();
TransitionArray::TraverseTransitionTree(this, &GetMinInobjectSlack, &slack);
if (slack != 0) {
// Resize the initial map and all maps in its transition tree.
TransitionArray::TraverseTransitionTree(this, &ShrinkInstanceSize, &slack);
} else {
TransitionArray::TraverseTransitionTree(this, &StopSlackTracking, nullptr);
}
}
static bool PrototypeBenefitsFromNormalization(Handle<JSObject> object) {
DisallowHeapAllocation no_gc;
if (!object->HasFastProperties()) return false;
if (object->IsJSGlobalProxy()) return false;
if (object->GetIsolate()->bootstrapper()->IsActive()) return false;
return !object->map()->is_prototype_map() ||
!object->map()->should_be_fast_prototype_map();
}
// static
void JSObject::MakePrototypesFast(Handle<Object> receiver,
WhereToStart where_to_start,
Isolate* isolate) {
if (!receiver->IsJSReceiver()) return;
for (PrototypeIterator iter(isolate, Handle<JSReceiver>::cast(receiver),
where_to_start);
!iter.IsAtEnd(); iter.Advance()) {
Handle<Object> current = PrototypeIterator::GetCurrent(iter);
if (!current->IsJSObject()) return;
Handle<JSObject> current_obj = Handle<JSObject>::cast(current);
Map* current_map = current_obj->map();
if (current_map->is_prototype_map()) {
// If the map is already marked as should be fast, we're done. Its
// prototypes will have been marked already as well.
if (current_map->should_be_fast_prototype_map()) return;
Handle<Map> map(current_map);
Map::SetShouldBeFastPrototypeMap(map, true, isolate);
JSObject::OptimizeAsPrototype(current_obj, FAST_PROTOTYPE);
}
}
}
// static
void JSObject::OptimizeAsPrototype(Handle<JSObject> object,
PrototypeOptimizationMode mode) {
if (object->IsJSGlobalObject()) return;
if (mode == FAST_PROTOTYPE && PrototypeBenefitsFromNormalization(object)) {
// First normalize to ensure all JSFunctions are DATA_CONSTANT.
JSObject::NormalizeProperties(object, KEEP_INOBJECT_PROPERTIES, 0,
"NormalizeAsPrototype");
}
Handle<Map> previous_map(object->map());
if (object->map()->is_prototype_map()) {
if (object->map()->should_be_fast_prototype_map() &&
!object->HasFastProperties()) {
JSObject::MigrateSlowToFast(object, 0, "OptimizeAsPrototype");
}
} else {
if (object->map() == *previous_map) {
Handle<Map> new_map = Map::Copy(handle(object->map()), "CopyAsPrototype");
JSObject::MigrateToMap(object, new_map);
}
object->map()->set_is_prototype_map(true);
// Replace the pointer to the exact constructor with the Object function
// from the same context if undetectable from JS. This is to avoid keeping
// memory alive unnecessarily.
Object* maybe_constructor = object->map()->GetConstructor();
if (maybe_constructor->IsJSFunction()) {
JSFunction* constructor = JSFunction::cast(maybe_constructor);
Isolate* isolate = object->GetIsolate();
if (!constructor->shared()->IsApiFunction() &&
object->class_name() == isolate->heap()->Object_string()) {
Context* context = constructor->context()->native_context();
JSFunction* object_function = context->object_function();
object->map()->SetConstructor(object_function);
}
}
}
}
// static
void JSObject::ReoptimizeIfPrototype(Handle<JSObject> object) {
if (!object->map()->is_prototype_map()) return;
if (!object->map()->should_be_fast_prototype_map()) return;
OptimizeAsPrototype(object, FAST_PROTOTYPE);
}
// static
void JSObject::LazyRegisterPrototypeUser(Handle<Map> user, Isolate* isolate) {
// Contract: In line with InvalidatePrototypeChains()'s requirements,
// leaf maps don't need to register as users, only prototypes do.
DCHECK(user->is_prototype_map());
Handle<Map> current_user = user;
Handle<PrototypeInfo> current_user_info =
Map::GetOrCreatePrototypeInfo(user, isolate);
for (PrototypeIterator iter(user); !iter.IsAtEnd(); iter.Advance()) {
// Walk up the prototype chain as far as links haven't been registered yet.
if (current_user_info->registry_slot() != PrototypeInfo::UNREGISTERED) {
break;
}
Handle<Object> maybe_proto = PrototypeIterator::GetCurrent(iter);
// Proxies on the prototype chain are not supported. They make it
// impossible to make any assumptions about the prototype chain anyway.
if (maybe_proto->IsJSProxy()) return;
Handle<JSObject> proto = Handle<JSObject>::cast(maybe_proto);
Handle<PrototypeInfo> proto_info =
Map::GetOrCreatePrototypeInfo(proto, isolate);
Handle<Object> maybe_registry(proto_info->prototype_users(), isolate);
int slot = 0;
Handle<WeakFixedArray> new_array =
WeakFixedArray::Add(maybe_registry, current_user, &slot);
current_user_info->set_registry_slot(slot);
if (!maybe_registry.is_identical_to(new_array)) {
proto_info->set_prototype_users(*new_array);
}
if (FLAG_trace_prototype_users) {
PrintF("Registering %p as a user of prototype %p (map=%p).\n",
reinterpret_cast<void*>(*current_user),
reinterpret_cast<void*>(*proto),
reinterpret_cast<void*>(proto->map()));
}
current_user = handle(proto->map(), isolate);
current_user_info = proto_info;
}
}
// Can be called regardless of whether |user| was actually registered with
// |prototype|. Returns true when there was a registration.
// static
bool JSObject::UnregisterPrototypeUser(Handle<Map> user, Isolate* isolate) {
DCHECK(user->is_prototype_map());
// If it doesn't have a PrototypeInfo, it was never registered.
if (!user->prototype_info()->IsPrototypeInfo()) return false;
// If it had no prototype before, see if it had users that might expect
// registration.
if (!user->prototype()->IsJSObject()) {
Object* users =
PrototypeInfo::cast(user->prototype_info())->prototype_users();
return users->IsWeakFixedArray();
}
Handle<JSObject> prototype(JSObject::cast(user->prototype()), isolate);
Handle<PrototypeInfo> user_info =
Map::GetOrCreatePrototypeInfo(user, isolate);
int slot = user_info->registry_slot();
if (slot == PrototypeInfo::UNREGISTERED) return false;
DCHECK(prototype->map()->is_prototype_map());
Object* maybe_proto_info = prototype->map()->prototype_info();
// User knows its registry slot, prototype info and user registry must exist.
DCHECK(maybe_proto_info->IsPrototypeInfo());
Handle<PrototypeInfo> proto_info(PrototypeInfo::cast(maybe_proto_info),
isolate);
Object* maybe_registry = proto_info->prototype_users();
DCHECK(maybe_registry->IsWeakFixedArray());
DCHECK(WeakFixedArray::cast(maybe_registry)->Get(slot) == *user);
WeakFixedArray::cast(maybe_registry)->Clear(slot);
if (FLAG_trace_prototype_users) {
PrintF("Unregistering %p as a user of prototype %p.\n",
reinterpret_cast<void*>(*user), reinterpret_cast<void*>(*prototype));
}
return true;
}
static void InvalidatePrototypeChainsInternal(Map* map) {
DCHECK(map->is_prototype_map());
if (FLAG_trace_prototype_users) {
PrintF("Invalidating prototype map %p 's cell\n",
reinterpret_cast<void*>(map));
}
Object* maybe_proto_info = map->prototype_info();
if (!maybe_proto_info->IsPrototypeInfo()) return;
PrototypeInfo* proto_info = PrototypeInfo::cast(maybe_proto_info);
Object* maybe_cell = proto_info->validity_cell();
if (maybe_cell->IsCell()) {
// Just set the value; the cell will be replaced lazily.
Cell* cell = Cell::cast(maybe_cell);
cell->set_value(Smi::FromInt(Map::kPrototypeChainInvalid));
}
WeakFixedArray::Iterator iterator(proto_info->prototype_users());
// For now, only maps register themselves as users.
Map* user;
while ((user = iterator.Next<Map>())) {
// Walk the prototype chain (backwards, towards leaf objects) if necessary.
InvalidatePrototypeChainsInternal(user);
}
}
// static
void JSObject::InvalidatePrototypeChains(Map* map) {
DisallowHeapAllocation no_gc;
InvalidatePrototypeChainsInternal(map);
}
// static
Handle<PrototypeInfo> Map::GetOrCreatePrototypeInfo(Handle<JSObject> prototype,
Isolate* isolate) {
Object* maybe_proto_info = prototype->map()->prototype_info();
if (maybe_proto_info->IsPrototypeInfo()) {
return handle(PrototypeInfo::cast(maybe_proto_info), isolate);
}
Handle<PrototypeInfo> proto_info = isolate->factory()->NewPrototypeInfo();
prototype->map()->set_prototype_info(*proto_info);
return proto_info;
}
// static
Handle<PrototypeInfo> Map::GetOrCreatePrototypeInfo(Handle<Map> prototype_map,
Isolate* isolate) {
Object* maybe_proto_info = prototype_map->prototype_info();
if (maybe_proto_info->IsPrototypeInfo()) {
return handle(PrototypeInfo::cast(maybe_proto_info), isolate);
}
Handle<PrototypeInfo> proto_info = isolate->factory()->NewPrototypeInfo();
prototype_map->set_prototype_info(*proto_info);
return proto_info;
}
// static
void Map::SetShouldBeFastPrototypeMap(Handle<Map> map, bool value,
Isolate* isolate) {
if (value == false && !map->prototype_info()->IsPrototypeInfo()) {
// "False" is the implicit default value, so there's nothing to do.
return;
}
GetOrCreatePrototypeInfo(map, isolate)->set_should_be_fast_map(value);
}
// static
Handle<Cell> Map::GetOrCreatePrototypeChainValidityCell(Handle<Map> map,
Isolate* isolate) {
Handle<Object> maybe_prototype;
if (map->IsJSGlobalObjectMap()) {
DCHECK(map->is_prototype_map());
// Global object is prototype of a global proxy and therefore we can
// use its validity cell for guarding global object's prototype change.
maybe_prototype = isolate->global_object();
} else {
maybe_prototype =
handle(map->GetPrototypeChainRootMap(isolate)->prototype(), isolate);
if (!maybe_prototype->IsJSObject()) return Handle<Cell>::null();
}
Handle<JSObject> prototype = Handle<JSObject>::cast(maybe_prototype);
// Ensure the prototype is registered with its own prototypes so its cell
// will be invalidated when necessary.
JSObject::LazyRegisterPrototypeUser(handle(prototype->map(), isolate),
isolate);
Handle<PrototypeInfo> proto_info =
GetOrCreatePrototypeInfo(prototype, isolate);
Object* maybe_cell = proto_info->validity_cell();
// Return existing cell if it's still valid.
if (maybe_cell->IsCell()) {
Handle<Cell> cell(Cell::cast(maybe_cell), isolate);
if (cell->value() == Smi::FromInt(Map::kPrototypeChainValid)) {
return cell;
}
}
// Otherwise create a new cell.
Handle<Cell> cell = isolate->factory()->NewCell(
handle(Smi::FromInt(Map::kPrototypeChainValid), isolate));
proto_info->set_validity_cell(*cell);
return cell;
}
// static
Handle<WeakCell> Map::GetOrCreatePrototypeWeakCell(Handle<JSObject> prototype,
Isolate* isolate) {
DCHECK(!prototype.is_null());
Handle<PrototypeInfo> proto_info =
GetOrCreatePrototypeInfo(prototype, isolate);
Object* maybe_cell = proto_info->weak_cell();
// Return existing cell if it's already created.
if (maybe_cell->IsWeakCell()) {
Handle<WeakCell> cell(WeakCell::cast(maybe_cell), isolate);
DCHECK(!cell->cleared());
return cell;
}
// Otherwise create a new cell.
Handle<WeakCell> cell = isolate->factory()->NewWeakCell(prototype);
proto_info->set_weak_cell(*cell);
return cell;
}
// static
void Map::SetPrototype(Handle<Map> map, Handle<Object> prototype,
PrototypeOptimizationMode proto_mode) {
RuntimeCallTimerScope stats_scope(*map, &RuntimeCallStats::Map_SetPrototype);
bool is_hidden = false;
if (prototype->IsJSObject()) {
Handle<JSObject> prototype_jsobj = Handle<JSObject>::cast(prototype);
JSObject::OptimizeAsPrototype(prototype_jsobj, proto_mode);
Object* maybe_constructor = prototype_jsobj->map()->GetConstructor();
if (maybe_constructor->IsJSFunction()) {
JSFunction* constructor = JSFunction::cast(maybe_constructor);
Object* data = constructor->shared()->function_data();
is_hidden = (data->IsFunctionTemplateInfo() &&
FunctionTemplateInfo::cast(data)->hidden_prototype()) ||
prototype->IsJSGlobalObject();
}
}
map->set_has_hidden_prototype(is_hidden);
WriteBarrierMode wb_mode = prototype->IsNull(map->GetIsolate())
? SKIP_WRITE_BARRIER
: UPDATE_WRITE_BARRIER;
map->set_prototype(*prototype, wb_mode);
}
Handle<Object> CacheInitialJSArrayMaps(
Handle<Context> native_context, Handle<Map> initial_map) {
// Replace all of the cached initial array maps in the native context with
// the appropriate transitioned elements kind maps.
Handle<Map> current_map = initial_map;
ElementsKind kind = current_map->elements_kind();
DCHECK_EQ(GetInitialFastElementsKind(), kind);
native_context->set(Context::ArrayMapIndex(kind), *current_map);
for (int i = GetSequenceIndexFromFastElementsKind(kind) + 1;
i < kFastElementsKindCount; ++i) {
Handle<Map> new_map;
ElementsKind next_kind = GetFastElementsKindFromSequenceIndex(i);
if (Map* maybe_elements_transition = current_map->ElementsTransitionMap()) {
new_map = handle(maybe_elements_transition);
} else {
new_map = Map::CopyAsElementsKind(
current_map, next_kind, INSERT_TRANSITION);
}
DCHECK_EQ(next_kind, new_map->elements_kind());
native_context->set(Context::ArrayMapIndex(next_kind), *new_map);
current_map = new_map;
}
return initial_map;
}
void JSFunction::SetInstancePrototype(Handle<JSFunction> function,
Handle<Object> value) {
Isolate* isolate = function->GetIsolate();
DCHECK(value->IsJSReceiver());
// Now some logic for the maps of the objects that are created by using this
// function as a constructor.
if (function->has_initial_map()) {
// If the function has allocated the initial map replace it with a
// copy containing the new prototype. Also complete any in-object
// slack tracking that is in progress at this point because it is
// still tracking the old copy.
function->CompleteInobjectSlackTrackingIfActive();
Handle<Map> initial_map(function->initial_map(), isolate);
if (!initial_map->GetIsolate()->bootstrapper()->IsActive() &&
initial_map->instance_type() == JS_OBJECT_TYPE) {
// Put the value in the initial map field until an initial map is needed.
// At that point, a new initial map is created and the prototype is put
// into the initial map where it belongs.
function->set_prototype_or_initial_map(*value);
} else {
Handle<Map> new_map = Map::Copy(initial_map, "SetInstancePrototype");
JSFunction::SetInitialMap(function, new_map, value);
// If the function is used as the global Array function, cache the
// updated initial maps (and transitioned versions) in the native context.
Handle<Context> native_context(function->context()->native_context(),
isolate);
Handle<Object> array_function(
native_context->get(Context::ARRAY_FUNCTION_INDEX), isolate);
if (array_function->IsJSFunction() &&
*function == JSFunction::cast(*array_function)) {
CacheInitialJSArrayMaps(native_context, new_map);
}
}
// Deoptimize all code that embeds the previous initial map.
initial_map->dependent_code()->DeoptimizeDependentCodeGroup(
isolate, DependentCode::kInitialMapChangedGroup);
} else {
// Put the value in the initial map field until an initial map is
// needed. At that point, a new initial map is created and the
// prototype is put into the initial map where it belongs.
function->set_prototype_or_initial_map(*value);
if (value->IsJSObject()) {
// Optimize as prototype to detach it from its transition tree.
JSObject::OptimizeAsPrototype(Handle<JSObject>::cast(value),
FAST_PROTOTYPE);
}
}
isolate->heap()->ClearInstanceofCache();
}
void JSFunction::SetPrototype(Handle<JSFunction> function,
Handle<Object> value) {
DCHECK(function->IsConstructor() ||
IsGeneratorFunction(function->shared()->kind()));
Handle<Object> construct_prototype = value;
// If the value is not a JSReceiver, store the value in the map's
// constructor field so it can be accessed. Also, set the prototype
// used for constructing objects to the original object prototype.
// See ECMA-262 13.2.2.
if (!value->IsJSReceiver()) {
// Copy the map so this does not affect unrelated functions.
// Remove map transitions because they point to maps with a
// different prototype.
Handle<Map> new_map = Map::Copy(handle(function->map()), "SetPrototype");
JSObject::MigrateToMap(function, new_map);
new_map->SetConstructor(*value);
new_map->set_non_instance_prototype(true);
Isolate* isolate = new_map->GetIsolate();
construct_prototype = handle(
IsGeneratorFunction(function->shared()->kind())
? function->context()
->native_context()
->initial_generator_prototype()
: function->context()->native_context()->initial_object_prototype(),
isolate);
} else {
function->map()->set_non_instance_prototype(false);
}
return SetInstancePrototype(function, construct_prototype);
}
bool JSFunction::RemovePrototype() {
Context* native_context = context()->native_context();
Map* no_prototype_map =
is_strict(shared()->language_mode())
? native_context->strict_function_without_prototype_map()
: native_context->sloppy_function_without_prototype_map();
if (map() == no_prototype_map) return true;
#ifdef DEBUG
if (map() != (is_strict(shared()->language_mode())
? native_context->strict_function_map()
: native_context->sloppy_function_map())) {
return false;
}
#endif
set_map(no_prototype_map);
set_prototype_or_initial_map(no_prototype_map->GetHeap()->the_hole_value());
return true;
}
void JSFunction::SetInitialMap(Handle<JSFunction> function, Handle<Map> map,
Handle<Object> prototype) {
if (map->prototype() != *prototype) {
Map::SetPrototype(map, prototype, FAST_PROTOTYPE);
}
function->set_prototype_or_initial_map(*map);
map->SetConstructor(*function);
#if TRACE_MAPS
if (FLAG_trace_maps) {
PrintF("[TraceMaps: InitialMap map= %p SFI= %d_%s ]\n",
reinterpret_cast<void*>(*map), function->shared()->unique_id(),
function->shared()->DebugName()->ToCString().get());
}
#endif
}
#ifdef DEBUG
namespace {
bool CanSubclassHaveInobjectProperties(InstanceType instance_type) {
switch (instance_type) {
case JS_API_OBJECT_TYPE:
case JS_ARRAY_BUFFER_TYPE:
case JS_ARRAY_TYPE:
case JS_ASYNC_FROM_SYNC_ITERATOR_TYPE:
case JS_CONTEXT_EXTENSION_OBJECT_TYPE:
case JS_DATA_VIEW_TYPE:
case JS_DATE_TYPE:
case JS_FUNCTION_TYPE:
case JS_GENERATOR_OBJECT_TYPE:
case JS_MAP_ITERATOR_TYPE:
case JS_MAP_TYPE:
case JS_MESSAGE_OBJECT_TYPE:
case JS_OBJECT_TYPE:
case JS_ERROR_TYPE:
case JS_ARGUMENTS_TYPE:
case JS_PROMISE_TYPE:
case JS_REGEXP_TYPE:
case JS_SET_ITERATOR_TYPE:
case JS_SET_TYPE:
case JS_SPECIAL_API_OBJECT_TYPE:
case JS_TYPED_ARRAY_TYPE:
case JS_VALUE_TYPE:
case JS_WEAK_MAP_TYPE:
case JS_WEAK_SET_TYPE:
return true;
case BYTECODE_ARRAY_TYPE:
case BYTE_ARRAY_TYPE:
case CELL_TYPE:
case CODE_TYPE:
case FILLER_TYPE:
case FIXED_ARRAY_TYPE:
case FIXED_DOUBLE_ARRAY_TYPE:
case FOREIGN_TYPE:
case FREE_SPACE_TYPE:
case HEAP_NUMBER_TYPE:
case JS_BOUND_FUNCTION_TYPE:
case JS_GLOBAL_OBJECT_TYPE:
case JS_GLOBAL_PROXY_TYPE:
case JS_PROXY_TYPE:
case MAP_TYPE:
case MUTABLE_HEAP_NUMBER_TYPE:
case ODDBALL_TYPE:
case PROPERTY_CELL_TYPE:
case SHARED_FUNCTION_INFO_TYPE:
case SYMBOL_TYPE:
case WEAK_CELL_TYPE:
#define TYPED_ARRAY_CASE(Type, type, TYPE, ctype, size) \
case FIXED_##TYPE##_ARRAY_TYPE:
#undef TYPED_ARRAY_CASE
#define MAKE_STRUCT_CASE(NAME, Name, name) case NAME##_TYPE:
STRUCT_LIST(MAKE_STRUCT_CASE)
#undef MAKE_STRUCT_CASE
// We must not end up here for these instance types at all.
UNREACHABLE();
// Fall through.
default:
return false;
}
}
} // namespace
#endif
void JSFunction::EnsureHasInitialMap(Handle<JSFunction> function) {
DCHECK(function->IsConstructor() ||
IsResumableFunction(function->shared()->kind()));
if (function->has_initial_map()) return;
Isolate* isolate = function->GetIsolate();
// The constructor should be compiled for the optimization hints to be
// available.
Compiler::Compile(function, Compiler::CLEAR_EXCEPTION);
// First create a new map with the size and number of in-object properties
// suggested by the function.
InstanceType instance_type;
if (IsResumableFunction(function->shared()->kind())) {
instance_type = JS_GENERATOR_OBJECT_TYPE;
} else {
instance_type = JS_OBJECT_TYPE;
}
int instance_size;
int in_object_properties;
function->CalculateInstanceSize(instance_type, 0, &instance_size,
&in_object_properties);
Handle<Map> map = isolate->factory()->NewMap(instance_type, instance_size);
// Fetch or allocate prototype.
Handle<Object> prototype;
if (function->has_instance_prototype()) {
prototype = handle(function->instance_prototype(), isolate);
} else {
prototype = isolate->factory()->NewFunctionPrototype(function);
}
map->SetInObjectProperties(in_object_properties);
map->set_unused_property_fields(in_object_properties);
DCHECK(map->has_fast_object_elements());
// Finally link initial map and constructor function.
DCHECK(prototype->IsJSReceiver());
JSFunction::SetInitialMap(function, map, prototype);
map->StartInobjectSlackTracking();
}
// static
MaybeHandle<Map> JSFunction::GetDerivedMap(Isolate* isolate,
Handle<JSFunction> constructor,
Handle<JSReceiver> new_target) {
EnsureHasInitialMap(constructor);
Handle<Map> constructor_initial_map(constructor->initial_map(), isolate);
if (*new_target == *constructor) return constructor_initial_map;
// Fast case, new.target is a subclass of constructor. The map is cacheable
// (and may already have been cached). new.target.prototype is guaranteed to
// be a JSReceiver.
if (new_target->IsJSFunction()) {
Handle<JSFunction> function = Handle<JSFunction>::cast(new_target);
// Check that |function|'s initial map still in sync with the |constructor|,
// otherwise we must create a new initial map for |function|.
if (function->has_initial_map() &&
function->initial_map()->GetConstructor() == *constructor) {
return handle(function->initial_map(), isolate);
}
// Create a new map with the size and number of in-object properties
// suggested by |function|.
// Link initial map and constructor function if the new.target is actually a
// subclass constructor.
if (IsDerivedConstructor(function->shared()->kind())) {
Handle<Object> prototype(function->instance_prototype(), isolate);
InstanceType instance_type = constructor_initial_map->instance_type();
DCHECK(CanSubclassHaveInobjectProperties(instance_type));
int internal_fields =
JSObject::GetInternalFieldCount(*constructor_initial_map);
int pre_allocated = constructor_initial_map->GetInObjectProperties() -
constructor_initial_map->unused_property_fields();
int instance_size;
int in_object_properties;
function->CalculateInstanceSizeForDerivedClass(
instance_type, internal_fields, &instance_size,
&in_object_properties);
int unused_property_fields = in_object_properties - pre_allocated;
Handle<Map> map =
Map::CopyInitialMap(constructor_initial_map, instance_size,
in_object_properties, unused_property_fields);
map->set_new_target_is_base(false);
JSFunction::SetInitialMap(function, map, prototype);
map->SetConstructor(*constructor);
map->set_construction_counter(Map::kNoSlackTracking);
map->StartInobjectSlackTracking();
return map;
}
}
// Slow path, new.target is either a proxy or can't cache the map.
// new.target.prototype is not guaranteed to be a JSReceiver, and may need to
// fall back to the intrinsicDefaultProto.
Handle<Object> prototype;
if (new_target->IsJSFunction()) {
Handle<JSFunction> function = Handle<JSFunction>::cast(new_target);
// Make sure the new.target.prototype is cached.
EnsureHasInitialMap(function);
prototype = handle(function->prototype(), isolate);
} else {
Handle<String> prototype_string = isolate->factory()->prototype_string();
ASSIGN_RETURN_ON_EXCEPTION(
isolate, prototype,
JSReceiver::GetProperty(new_target, prototype_string), Map);
// The above prototype lookup might change the constructor and its
// prototype, hence we have to reload the initial map.
EnsureHasInitialMap(constructor);
constructor_initial_map = handle(constructor->initial_map(), isolate);
}
// If prototype is not a JSReceiver, fetch the intrinsicDefaultProto from the
// correct realm. Rather than directly fetching the .prototype, we fetch the
// constructor that points to the .prototype. This relies on
// constructor.prototype being FROZEN for those constructors.
if (!prototype->IsJSReceiver()) {
Handle<Context> context;
ASSIGN_RETURN_ON_EXCEPTION(isolate, context,
JSReceiver::GetFunctionRealm(new_target), Map);
DCHECK(context->IsNativeContext());
Handle<Object> maybe_index = JSReceiver::GetDataProperty(
constructor, isolate->factory()->native_context_index_symbol());
int index = maybe_index->IsSmi() ? Smi::cast(*maybe_index)->value()
: Context::OBJECT_FUNCTION_INDEX;
Handle<JSFunction> realm_constructor(JSFunction::cast(context->get(index)));
prototype = handle(realm_constructor->prototype(), isolate);
}
Handle<Map> map = Map::CopyInitialMap(constructor_initial_map);
map->set_new_target_is_base(false);
DCHECK(prototype->IsJSReceiver());
if (map->prototype() != *prototype) {
Map::SetPrototype(map, prototype, FAST_PROTOTYPE);
}
map->SetConstructor(*constructor);
return map;
}
void JSFunction::PrintName(FILE* out) {
std::unique_ptr<char[]> name = shared()->DebugName()->ToCString();
PrintF(out, "%s", name.get());
}
Handle<String> JSFunction::GetName(Handle<JSFunction> function) {
Isolate* isolate = function->GetIsolate();
Handle<Object> name =
JSReceiver::GetDataProperty(function, isolate->factory()->name_string());
if (name->IsString()) return Handle<String>::cast(name);
return handle(function->shared()->DebugName(), isolate);
}
Handle<String> JSFunction::GetDebugName(Handle<JSFunction> function) {
Isolate* isolate = function->GetIsolate();
Handle<Object> name = JSReceiver::GetDataProperty(
function, isolate->factory()->display_name_string());
if (name->IsString()) return Handle<String>::cast(name);
return JSFunction::GetName(function);
}
void JSFunction::SetName(Handle<JSFunction> function, Handle<Name> name,
Handle<String> prefix) {
Isolate* isolate = function->GetIsolate();
Handle<String> function_name = Name::ToFunctionName(name).ToHandleChecked();
if (prefix->length() > 0) {
IncrementalStringBuilder builder(isolate);
builder.AppendString(prefix);
builder.AppendCharacter(' ');
builder.AppendString(function_name);
function_name = builder.Finish().ToHandleChecked();
}
JSObject::DefinePropertyOrElementIgnoreAttributes(
function, isolate->factory()->name_string(), function_name,
static_cast<PropertyAttributes>(DONT_ENUM | READ_ONLY))
.ToHandleChecked();
}
namespace {
char const kNativeCodeSource[] = "function () { [native code] }";
Handle<String> NativeCodeFunctionSourceString(
Handle<SharedFunctionInfo> shared_info) {
Isolate* const isolate = shared_info->GetIsolate();
if (shared_info->name()->IsString()) {
IncrementalStringBuilder builder(isolate);
builder.AppendCString("function ");
builder.AppendString(handle(String::cast(shared_info->name()), isolate));
builder.AppendCString("() { [native code] }");
return builder.Finish().ToHandleChecked();
}
return isolate->factory()->NewStringFromAsciiChecked(kNativeCodeSource);
}
} // namespace
// static
Handle<String> JSBoundFunction::ToString(Handle<JSBoundFunction> function) {
Isolate* const isolate = function->GetIsolate();
return isolate->factory()->NewStringFromAsciiChecked(kNativeCodeSource);
}
// static
Handle<String> JSFunction::ToString(Handle<JSFunction> function) {
Isolate* const isolate = function->GetIsolate();
Handle<SharedFunctionInfo> shared_info(function->shared(), isolate);
// Check if {function} should hide its source code.
if (!shared_info->IsUserJavaScript()) {
return NativeCodeFunctionSourceString(shared_info);
}
// Check if we should print {function} as a class.
Handle<Object> class_start_position = JSReceiver::GetDataProperty(
function, isolate->factory()->class_start_position_symbol());
if (class_start_position->IsSmi()) {
Handle<Object> class_end_position = JSReceiver::GetDataProperty(
function, isolate->factory()->class_end_position_symbol());
Handle<String> script_source(
String::cast(Script::cast(shared_info->script())->source()), isolate);
return isolate->factory()->NewSubString(
script_source, Handle<Smi>::cast(class_start_position)->value(),
Handle<Smi>::cast(class_end_position)->value());
}
// Check if we have source code for the {function}.
if (!shared_info->HasSourceCode()) {
return NativeCodeFunctionSourceString(shared_info);
}
if (FLAG_harmony_function_tostring) {
return Handle<String>::cast(shared_info->GetSourceCodeHarmony());
}
IncrementalStringBuilder builder(isolate);
FunctionKind kind = shared_info->kind();
if (!IsArrowFunction(kind)) {
if (IsConciseMethod(kind)) {
if (IsGeneratorFunction(kind)) {
builder.AppendCharacter('*');
} else if (IsAsyncFunction(kind)) {
builder.AppendCString("async ");
}
} else {
if (IsGeneratorFunction(kind)) {
builder.AppendCString("function* ");
} else if (IsAsyncFunction(kind)) {
builder.AppendCString("async function ");
} else {
builder.AppendCString("function ");
}
}
if (shared_info->name_should_print_as_anonymous()) {
builder.AppendCString("anonymous");
} else if (!shared_info->is_anonymous_expression()) {
builder.AppendString(handle(String::cast(shared_info->name()), isolate));
}
}
builder.AppendString(Handle<String>::cast(shared_info->GetSourceCode()));
return builder.Finish().ToHandleChecked();
}
void Oddball::Initialize(Isolate* isolate, Handle<Oddball> oddball,
const char* to_string, Handle<Object> to_number,
const char* type_of, byte kind) {
Handle<String> internalized_to_string =
isolate->factory()->InternalizeUtf8String(to_string);
Handle<String> internalized_type_of =
isolate->factory()->InternalizeUtf8String(type_of);
oddball->set_to_number_raw(to_number->Number());
oddball->set_to_number(*to_number);
oddball->set_to_string(*internalized_to_string);
oddball->set_type_of(*internalized_type_of);
oddball->set_kind(kind);
}
void Script::SetEvalOrigin(Handle<Script> script,
Handle<SharedFunctionInfo> outer_info,
int eval_position) {
if (eval_position == kNoSourcePosition) {
// If the position is missing, attempt to get the code offset from the
// current activation. Do not translate the code offset into source
// position, but store it as negative value for lazy translation.
StackTraceFrameIterator it(script->GetIsolate());
if (!it.done() && it.is_javascript()) {
FrameSummary summary = FrameSummary::GetTop(it.javascript_frame());
script->set_eval_from_shared(summary.AsJavaScript().function()->shared());
script->set_eval_from_position(-summary.code_offset());
return;
}
eval_position = 0;
}
script->set_eval_from_shared(*outer_info);
script->set_eval_from_position(eval_position);
}
int Script::GetEvalPosition() {
DisallowHeapAllocation no_gc;
DCHECK(compilation_type() == Script::COMPILATION_TYPE_EVAL);
int position = eval_from_position();
if (position < 0) {
// Due to laziness, the position may not have been translated from code
// offset yet, which would be encoded as negative integer. In that case,
// translate and set the position.
if (eval_from_shared()->IsUndefined(GetIsolate())) {
position = 0;
} else {
SharedFunctionInfo* shared = SharedFunctionInfo::cast(eval_from_shared());
position = shared->abstract_code()->SourcePosition(-position);
}
DCHECK(position >= 0);
set_eval_from_position(position);
}
return position;
}
void Script::InitLineEnds(Handle<Script> script) {
Isolate* isolate = script->GetIsolate();
if (!script->line_ends()->IsUndefined(isolate)) return;
DCHECK_NE(Script::TYPE_WASM, script->type());
Object* src_obj = script->source();
if (!src_obj->IsString()) {
DCHECK(src_obj->IsUndefined(isolate));
script->set_line_ends(isolate->heap()->empty_fixed_array());
} else {
DCHECK(src_obj->IsString());
Handle<String> src(String::cast(src_obj), isolate);
Handle<FixedArray> array = String::CalculateLineEnds(src, true);
script->set_line_ends(*array);
}
DCHECK(script->line_ends()->IsFixedArray());
}
bool Script::GetPositionInfo(Handle<Script> script, int position,
PositionInfo* info, OffsetFlag offset_flag) {
// For wasm, we do not create an artificial line_ends array, but do the
// translation directly.
if (script->type() != Script::TYPE_WASM) InitLineEnds(script);
return script->GetPositionInfo(position, info, offset_flag);
}
namespace {
bool GetPositionInfoSlow(const Script* script, int position,
Script::PositionInfo* info) {
if (!script->source()->IsString()) return false;
if (position < 0) position = 0;
String* source_string = String::cast(script->source());
int line = 0;
int line_start = 0;
int len = source_string->length();
for (int pos = 0; pos <= len; ++pos) {
if (pos == len || source_string->Get(pos) == '\n') {
if (position <= pos) {
info->line = line;
info->column = position - line_start;
info->line_start = line_start;
info->line_end = pos;
return true;
}
line++;
line_start = pos + 1;
}
}
return false;
}
} // namespace
#define SMI_VALUE(x) (Smi::cast(x)->value())
bool Script::GetPositionInfo(int position, PositionInfo* info,
OffsetFlag offset_flag) const {
DisallowHeapAllocation no_allocation;
// For wasm, we do not rely on the line_ends array, but do the translation
// directly.
if (type() == Script::TYPE_WASM) {
Handle<WasmCompiledModule> compiled_module(
WasmCompiledModule::cast(wasm_compiled_module()));
DCHECK_LE(0, position);
return compiled_module->GetPositionInfo(static_cast<uint32_t>(position),
info);
}
if (line_ends()->IsUndefined(GetIsolate())) {
// Slow mode: we do not have line_ends. We have to iterate through source.
if (!GetPositionInfoSlow(this, position, info)) return false;
} else {
DCHECK(line_ends()->IsFixedArray());
FixedArray* ends = FixedArray::cast(line_ends());
const int ends_len = ends->length();
if (ends_len == 0) return false;
// Return early on invalid positions. Negative positions behave as if 0 was
// passed, and positions beyond the end of the script return as failure.
if (position < 0) {
position = 0;
} else if (position > SMI_VALUE(ends->get(ends_len - 1))) {
return false;
}
// Determine line number by doing a binary search on the line ends array.
if (SMI_VALUE(ends->get(0)) >= position) {
info->line = 0;
info->line_start = 0;
info->column = position;
} else {
int left = 0;
int right = ends_len - 1;
while (right > 0) {
DCHECK_LE(left, right);
const int mid = (left + right) / 2;
if (position > SMI_VALUE(ends->get(mid))) {
left = mid + 1;
} else if (position <= SMI_VALUE(ends->get(mid - 1))) {
right = mid - 1;
} else {
info->line = mid;
break;
}
}
DCHECK(SMI_VALUE(ends->get(info->line)) >= position &&
SMI_VALUE(ends->get(info->line - 1)) < position);
info->line_start = SMI_VALUE(ends->get(info->line - 1)) + 1;
info->column = position - info->line_start;
}
// Line end is position of the linebreak character.
info->line_end = SMI_VALUE(ends->get(info->line));
if (info->line_end > 0) {
DCHECK(source()->IsString());
String* src = String::cast(source());
if (src->length() >= info->line_end &&
src->Get(info->line_end - 1) == '\r') {
info->line_end--;
}
}
}
// Add offsets if requested.
if (offset_flag == WITH_OFFSET) {
if (info->line == 0) {
info->column += column_offset();
}
info->line += line_offset();
}
return true;
}
#undef SMI_VALUE
int Script::GetColumnNumber(Handle<Script> script, int code_pos) {
PositionInfo info;
GetPositionInfo(script, code_pos, &info, WITH_OFFSET);
return info.column;
}
int Script::GetColumnNumber(int code_pos) const {
PositionInfo info;
GetPositionInfo(code_pos, &info, WITH_OFFSET);
return info.column;
}
int Script::GetLineNumber(Handle<Script> script, int code_pos) {
PositionInfo info;
GetPositionInfo(script, code_pos, &info, WITH_OFFSET);
return info.line;
}
int Script::GetLineNumber(int code_pos) const {
PositionInfo info;
GetPositionInfo(code_pos, &info, WITH_OFFSET);
return info.line;
}
Object* Script::GetNameOrSourceURL() {
Isolate* isolate = GetIsolate();
// Keep in sync with ScriptNameOrSourceURL in messages.js.
if (!source_url()->IsUndefined(isolate)) return source_url();
return name();
}
Handle<JSObject> Script::GetWrapper(Handle<Script> script) {
Isolate* isolate = script->GetIsolate();
if (!script->wrapper()->IsUndefined(isolate)) {
DCHECK(script->wrapper()->IsWeakCell());
Handle<WeakCell> cell(WeakCell::cast(script->wrapper()));
if (!cell->cleared()) {
// Return a handle for the existing script wrapper from the cache.
return handle(JSObject::cast(cell->value()));
}
// If we found an empty WeakCell, that means the script wrapper was
// GCed. We are not notified directly of that, so we decrement here
// so that we at least don't count double for any given script.
isolate->counters()->script_wrappers()->Decrement();
}
// Construct a new script wrapper.
isolate->counters()->script_wrappers()->Increment();
Handle<JSFunction> constructor = isolate->script_function();
Handle<JSValue> result =
Handle<JSValue>::cast(isolate->factory()->NewJSObject(constructor));
result->set_value(*script);
Handle<WeakCell> cell = isolate->factory()->NewWeakCell(result);
script->set_wrapper(*cell);
return result;
}
MaybeHandle<SharedFunctionInfo> Script::FindSharedFunctionInfo(
Isolate* isolate, const FunctionLiteral* fun) {
DCHECK_NE(fun->function_literal_id(), FunctionLiteral::kIdTypeInvalid);
DCHECK_LT(fun->function_literal_id(), shared_function_infos()->length());
Object* shared = shared_function_infos()->get(fun->function_literal_id());
if (shared->IsUndefined(isolate) || WeakCell::cast(shared)->cleared()) {
return MaybeHandle<SharedFunctionInfo>();
}
return handle(SharedFunctionInfo::cast(WeakCell::cast(shared)->value()));
}
Script::Iterator::Iterator(Isolate* isolate)
: iterator_(isolate->heap()->script_list()) {}
Script* Script::Iterator::Next() { return iterator_.Next<Script>(); }
SharedFunctionInfo::ScriptIterator::ScriptIterator(Handle<Script> script)
: ScriptIterator(script->GetIsolate(),
handle(script->shared_function_infos())) {}
SharedFunctionInfo::ScriptIterator::ScriptIterator(
Isolate* isolate, Handle<FixedArray> shared_function_infos)
: isolate_(isolate),
shared_function_infos_(shared_function_infos),
index_(0) {}
SharedFunctionInfo* SharedFunctionInfo::ScriptIterator::Next() {
while (index_ < shared_function_infos_->length()) {
Object* raw = shared_function_infos_->get(index_++);
if (raw->IsUndefined(isolate_) || WeakCell::cast(raw)->cleared()) continue;
return SharedFunctionInfo::cast(WeakCell::cast(raw)->value());
}
return nullptr;
}
void SharedFunctionInfo::ScriptIterator::Reset(Handle<Script> script) {
shared_function_infos_ = handle(script->shared_function_infos());
index_ = 0;
}
SharedFunctionInfo::GlobalIterator::GlobalIterator(Isolate* isolate)
: script_iterator_(isolate),
noscript_sfi_iterator_(isolate->heap()->noscript_shared_function_infos()),
sfi_iterator_(handle(script_iterator_.Next(), isolate)) {}
SharedFunctionInfo* SharedFunctionInfo::GlobalIterator::Next() {
SharedFunctionInfo* next = noscript_sfi_iterator_.Next<SharedFunctionInfo>();
if (next != nullptr) return next;
for (;;) {
next = sfi_iterator_.Next();
if (next != nullptr) return next;
Script* next_script = script_iterator_.Next();
if (next_script == nullptr) return nullptr;
sfi_iterator_.Reset(handle(next_script));
}
}
void SharedFunctionInfo::SetScript(Handle<SharedFunctionInfo> shared,
Handle<Object> script_object) {
DCHECK_NE(shared->function_literal_id(), FunctionLiteral::kIdTypeInvalid);
if (shared->script() == *script_object) return;
Isolate* isolate = shared->GetIsolate();
// Add shared function info to new script's list. If a collection occurs,
// the shared function info may be temporarily in two lists.
// This is okay because the gc-time processing of these lists can tolerate
// duplicates.
if (script_object->IsScript()) {
Handle<Script> script = Handle<Script>::cast(script_object);
Handle<FixedArray> list = handle(script->shared_function_infos(), isolate);
#ifdef DEBUG
DCHECK_LT(shared->function_literal_id(), list->length());
if (list->get(shared->function_literal_id())->IsWeakCell() &&
!WeakCell::cast(list->get(shared->function_literal_id()))->cleared()) {
DCHECK(
WeakCell::cast(list->get(shared->function_literal_id()))->value() ==
*shared);
}
#endif
Handle<WeakCell> cell = isolate->factory()->NewWeakCell(shared);
list->set(shared->function_literal_id(), *cell);
} else {
Handle<Object> list = isolate->factory()->noscript_shared_function_infos();
#ifdef DEBUG
if (FLAG_enable_slow_asserts) {
WeakFixedArray::Iterator iterator(*list);
SharedFunctionInfo* next;
while ((next = iterator.Next<SharedFunctionInfo>())) {
DCHECK_NE(next, *shared);
}
}
#endif // DEBUG
list = WeakFixedArray::Add(list, shared);
isolate->heap()->SetRootNoScriptSharedFunctionInfos(*list);
}
if (shared->script()->IsScript()) {
// Remove shared function info from old script's list.
Script* old_script = Script::cast(shared->script());
// Due to liveedit, it might happen that the old_script doesn't know
// about the SharedFunctionInfo, so we have to guard against that.
Handle<FixedArray> infos(old_script->shared_function_infos(), isolate);
if (shared->function_literal_id() < infos->length()) {
Object* raw = old_script->shared_function_infos()->get(
shared->function_literal_id());
if (!raw->IsWeakCell() || WeakCell::cast(raw)->value() == *shared) {
old_script->shared_function_infos()->set(
shared->function_literal_id(), isolate->heap()->undefined_value());
}
}
} else {
// Remove shared function info from root array.
Object* list = isolate->heap()->noscript_shared_function_infos();
CHECK(WeakFixedArray::cast(list)->Remove(shared));
}
// Finally set new script.
shared->set_script(*script_object);
}
String* SharedFunctionInfo::DebugName() {
Object* n = name();
if (!n->IsString() || String::cast(n)->length() == 0) return inferred_name();
return String::cast(n);
}
bool SharedFunctionInfo::HasNoSideEffect() {
if (!computed_has_no_side_effect()) {
DisallowHeapAllocation not_handlified;
Handle<SharedFunctionInfo> info(this);
set_has_no_side_effect(DebugEvaluate::FunctionHasNoSideEffect(info));
set_computed_has_no_side_effect(true);
}
return has_no_side_effect();
}
// The filter is a pattern that matches function names in this way:
// "*" all; the default
// "-" all but the top-level function
// "-name" all but the function "name"
// "" only the top-level function
// "name" only the function "name"
// "name*" only functions starting with "name"
// "~" none; the tilde is not an identifier
bool SharedFunctionInfo::PassesFilter(const char* raw_filter) {
if (*raw_filter == '*') return true;
String* name = DebugName();
Vector<const char> filter = CStrVector(raw_filter);
if (filter.length() == 0) return name->length() == 0;
if (filter[0] == '-') {
// Negative filter.
if (filter.length() == 1) {
return (name->length() != 0);
} else if (name->IsUtf8EqualTo(filter.SubVector(1, filter.length()))) {
return false;
}
if (filter[filter.length() - 1] == '*' &&
name->IsUtf8EqualTo(filter.SubVector(1, filter.length() - 1), true)) {
return false;
}
return true;
} else if (name->IsUtf8EqualTo(filter)) {
return true;
}
if (filter[filter.length() - 1] == '*' &&
name->IsUtf8EqualTo(filter.SubVector(0, filter.length() - 1), true)) {
return true;
}
return false;
}
bool SharedFunctionInfo::HasSourceCode() const {
Isolate* isolate = GetIsolate();
return !script()->IsUndefined(isolate) &&
!reinterpret_cast<Script*>(script())->source()->IsUndefined(isolate);
}
Handle<Object> SharedFunctionInfo::GetSourceCode() {
if (!HasSourceCode()) return GetIsolate()->factory()->undefined_value();
Handle<String> source(String::cast(Script::cast(script())->source()));
return GetIsolate()->factory()->NewSubString(
source, start_position(), end_position());
}
Handle<Object> SharedFunctionInfo::GetSourceCodeHarmony() {
Isolate* isolate = GetIsolate();
if (!HasSourceCode()) return isolate->factory()->undefined_value();
Handle<String> script_source(String::cast(Script::cast(script())->source()));
int start_pos = function_token_position();
if (start_pos == kNoSourcePosition) start_pos = start_position();
return isolate->factory()->NewSubString(script_source, start_pos,
end_position());
}
bool SharedFunctionInfo::IsInlineable() {
// Check that the function has a script associated with it.
if (!script()->IsScript()) return false;
return !optimization_disabled();
}
int SharedFunctionInfo::SourceSize() {
return end_position() - start_position();
}
void JSFunction::CalculateInstanceSizeHelper(InstanceType instance_type,
int requested_internal_fields,
int requested_in_object_properties,
int* instance_size,
int* in_object_properties) {
int header_size = JSObject::GetHeaderSize(instance_type);
DCHECK_LE(requested_internal_fields,
(JSObject::kMaxInstanceSize - header_size) >> kPointerSizeLog2);
*instance_size =
Min(header_size +
((requested_internal_fields + requested_in_object_properties)
<< kPointerSizeLog2),
JSObject::kMaxInstanceSize);
*in_object_properties = ((*instance_size - header_size) >> kPointerSizeLog2) -
requested_internal_fields;
}
void JSFunction::CalculateInstanceSize(InstanceType instance_type,
int requested_internal_fields,
int* instance_size,
int* in_object_properties) {
CalculateInstanceSizeHelper(instance_type, requested_internal_fields,
shared()->expected_nof_properties(),
instance_size, in_object_properties);
}
void JSFunction::CalculateInstanceSizeForDerivedClass(
InstanceType instance_type, int requested_internal_fields,
int* instance_size, int* in_object_properties) {
Isolate* isolate = GetIsolate();
int expected_nof_properties = 0;
for (PrototypeIterator iter(isolate, this, kStartAtReceiver); !iter.IsAtEnd();
iter.Advance()) {
JSReceiver* current = iter.GetCurrent<JSReceiver>();
if (!current->IsJSFunction()) break;
JSFunction* func = JSFunction::cast(current);
SharedFunctionInfo* shared = func->shared();
expected_nof_properties += shared->expected_nof_properties();
if (!IsDerivedConstructor(shared->kind())) {
break;
}
}
CalculateInstanceSizeHelper(instance_type, requested_internal_fields,
expected_nof_properties, instance_size,
in_object_properties);
}
// Output the source code without any allocation in the heap.
std::ostream& operator<<(std::ostream& os, const SourceCodeOf& v) {
const SharedFunctionInfo* s = v.value;
// For some native functions there is no source.
if (!s->HasSourceCode()) return os << "<No Source>";
// Get the source for the script which this function came from.
// Don't use String::cast because we don't want more assertion errors while
// we are already creating a stack dump.
String* script_source =
reinterpret_cast<String*>(Script::cast(s->script())->source());
if (!script_source->LooksValid()) return os << "<Invalid Source>";
if (!s->is_toplevel()) {
os << "function ";
Object* name = s->name();
if (name->IsString() && String::cast(name)->length() > 0) {
String::cast(name)->PrintUC16(os);
}
}
int len = s->end_position() - s->start_position();
if (len <= v.max_length || v.max_length < 0) {
script_source->PrintUC16(os, s->start_position(), s->end_position());
return os;
} else {
script_source->PrintUC16(os, s->start_position(),
s->start_position() + v.max_length);
return os << "...\n";
}
}
static bool IsCodeEquivalent(Code* code, Code* recompiled) {
if (code->instruction_size() != recompiled->instruction_size()) return false;
ByteArray* code_relocation = code->relocation_info();
ByteArray* recompiled_relocation = recompiled->relocation_info();
int length = code_relocation->length();
if (length != recompiled_relocation->length()) return false;
int compare = memcmp(code_relocation->GetDataStartAddress(),
recompiled_relocation->GetDataStartAddress(),
length);
return compare == 0;
}
void SharedFunctionInfo::EnableDeoptimizationSupport(Code* recompiled) {
DCHECK(!has_deoptimization_support());
DisallowHeapAllocation no_allocation;
Code* code = this->code();
if (IsCodeEquivalent(code, recompiled)) {
// Copy the deoptimization data from the recompiled code.
code->set_deoptimization_data(recompiled->deoptimization_data());
code->set_has_deoptimization_support(true);
} else {
// TODO(3025757): In case the recompiled isn't equivalent to the
// old code, we have to replace it. We should try to avoid this
// altogether because it flushes valuable type feedback by
// effectively resetting all IC state.
ReplaceCode(recompiled);
}
DCHECK(has_deoptimization_support());
}
void SharedFunctionInfo::DisableOptimization(BailoutReason reason) {
// Disable optimization for the shared function info and mark the
// code as non-optimizable. The marker on the shared function info
// is there because we flush non-optimized code thereby loosing the
// non-optimizable information for the code. When the code is
// regenerated and set on the shared function info it is marked as
// non-optimizable if optimization is disabled for the shared
// function info.
DCHECK(reason != kNoReason);
set_optimization_disabled(true);
set_disable_optimization_reason(reason);
// Code should be the lazy compilation stub or else unoptimized.
DCHECK(abstract_code()->kind() == AbstractCode::FUNCTION ||
abstract_code()->kind() == AbstractCode::INTERPRETED_FUNCTION ||
abstract_code()->kind() == AbstractCode::BUILTIN);
PROFILE(GetIsolate(), CodeDisableOptEvent(abstract_code(), this));
if (FLAG_trace_opt) {
PrintF("[disabled optimization for ");
ShortPrint();
PrintF(", reason: %s]\n", GetBailoutReason(reason));
}
}
namespace {
// Sets the expected number of properties based on estimate from parser.
void SetExpectedNofPropertiesFromEstimate(Handle<SharedFunctionInfo> shared,
FunctionLiteral* literal) {
int estimate = literal->expected_property_count();
// If no properties are added in the constructor, they are more likely
// to be added later.
if (estimate == 0) estimate = 2;
// TODO(yangguo): check whether those heuristics are still up-to-date.
// We do not shrink objects that go into a snapshot (yet), so we adjust
// the estimate conservatively.
if (shared->GetIsolate()->serializer_enabled()) {
estimate += 2;
} else {
// Inobject slack tracking will reclaim redundant inobject space later,
// so we can afford to adjust the estimate generously.
estimate += 8;
}
shared->set_expected_nof_properties(estimate);
}
} // namespace
void SharedFunctionInfo::InitFromFunctionLiteral(
Handle<SharedFunctionInfo> shared_info, FunctionLiteral* lit) {
// When adding fields here, make sure DeclarationScope::AnalyzePartially is
// updated accordingly.
shared_info->set_length(lit->function_length());
shared_info->set_internal_formal_parameter_count(lit->parameter_count());
shared_info->set_function_token_position(lit->function_token_position());
shared_info->set_start_position(lit->start_position());
shared_info->set_end_position(lit->end_position());
shared_info->set_is_declaration(lit->is_declaration());
shared_info->set_is_named_expression(lit->is_named_expression());
shared_info->set_is_anonymous_expression(lit->is_anonymous_expression());
shared_info->set_inferred_name(*lit->inferred_name());
shared_info->set_allows_lazy_compilation(lit->AllowsLazyCompilation());
shared_info->set_language_mode(lit->language_mode());
shared_info->set_uses_arguments(lit->scope()->arguments() != NULL);
shared_info->set_has_duplicate_parameters(lit->has_duplicate_parameters());
shared_info->set_kind(lit->kind());
if (!IsConstructable(lit->kind(), lit->language_mode())) {
shared_info->SetConstructStub(
*shared_info->GetIsolate()->builtins()->ConstructedNonConstructable());
}
shared_info->set_needs_home_object(lit->scope()->NeedsHomeObject());
shared_info->set_asm_function(lit->scope()->asm_function());
shared_info->set_function_literal_id(lit->function_literal_id());
SetExpectedNofPropertiesFromEstimate(shared_info, lit);
}
bool SharedFunctionInfo::VerifyBailoutId(BailoutId id) {
DCHECK(!id.IsNone());
Code* unoptimized = code();
DeoptimizationOutputData* data =
DeoptimizationOutputData::cast(unoptimized->deoptimization_data());
unsigned ignore = Deoptimizer::GetOutputInfo(data, id, this);
USE(ignore);
return true; // Return true if there was no DCHECK.
}
void SharedFunctionInfo::SetConstructStub(Code* code) {
if (code->kind() == Code::BUILTIN) code->set_is_construct_stub(true);
set_construct_stub(code);
}
void Map::StartInobjectSlackTracking() {
DCHECK(!IsInobjectSlackTrackingInProgress());
// No tracking during the snapshot construction phase.
Isolate* isolate = GetIsolate();
if (isolate->serializer_enabled()) return;
if (unused_property_fields() == 0) return;
set_construction_counter(Map::kSlackTrackingCounterStart);
}
void SharedFunctionInfo::ResetForNewContext(int new_ic_age) {
code()->ClearInlineCaches();
set_ic_age(new_ic_age);
if (code()->kind() == Code::FUNCTION) {
code()->set_profiler_ticks(0);
if (optimization_disabled() && opt_count() >= FLAG_max_opt_count) {
// Re-enable optimizations if they were disabled due to opt_count limit.
set_optimization_disabled(false);
}
set_opt_count(0);
set_deopt_count(0);
} else if (IsInterpreted()) {
set_profiler_ticks(0);
if (optimization_disabled() && opt_count() >= FLAG_max_opt_count) {
// Re-enable optimizations if they were disabled due to opt_count limit.
set_optimization_disabled(false);
}
set_opt_count(0);
set_deopt_count(0);
}
}
int SharedFunctionInfo::SearchOptimizedCodeMapEntry(Context* native_context) {
DisallowHeapAllocation no_gc;
DCHECK(native_context->IsNativeContext());
if (!OptimizedCodeMapIsCleared()) {
FixedArray* optimized_code_map = this->optimized_code_map();
int length = optimized_code_map->length();
for (int i = kEntriesStart; i < length; i += kEntryLength) {
if (WeakCell::cast(optimized_code_map->get(i + kContextOffset))
->value() == native_context) {
return i;
}
}
}
return -1;
}
void SharedFunctionInfo::ClearCodeFromOptimizedCodeMap() {
if (!OptimizedCodeMapIsCleared()) {
FixedArray* optimized_code_map = this->optimized_code_map();
int length = optimized_code_map->length();
WeakCell* empty_weak_cell = GetHeap()->empty_weak_cell();
for (int i = kEntriesStart; i < length; i += kEntryLength) {
optimized_code_map->set(i + kCachedCodeOffset, empty_weak_cell,
SKIP_WRITE_BARRIER);
}
}
}
Code* SharedFunctionInfo::SearchOptimizedCodeMap(Context* native_context,
BailoutId osr_ast_id) {
Code* result = nullptr;
if (!osr_ast_id.IsNone()) {
return native_context->SearchOptimizedCodeMap(this, osr_ast_id);
}
DCHECK(osr_ast_id.IsNone());
int entry = SearchOptimizedCodeMapEntry(native_context);
if (entry != kNotFound) {
FixedArray* code_map = optimized_code_map();
DCHECK_LE(entry + kEntryLength, code_map->length());
WeakCell* cell = WeakCell::cast(code_map->get(entry + kCachedCodeOffset));
result = cell->cleared() ? nullptr : Code::cast(cell->value());
}
return result;
}
#define DECLARE_TAG(ignore1, name, ignore2) name,
const char* const VisitorSynchronization::kTags[
VisitorSynchronization::kNumberOfSyncTags] = {
VISITOR_SYNCHRONIZATION_TAGS_LIST(DECLARE_TAG)
};
#undef DECLARE_TAG
#define DECLARE_TAG(ignore1, ignore2, name) name,
const char* const VisitorSynchronization::kTagNames[
VisitorSynchronization::kNumberOfSyncTags] = {
VISITOR_SYNCHRONIZATION_TAGS_LIST(DECLARE_TAG)
};
#undef DECLARE_TAG
void ObjectVisitor::VisitCodeTarget(RelocInfo* rinfo) {
DCHECK(RelocInfo::IsCodeTarget(rinfo->rmode()));
Object* old_pointer = Code::GetCodeFromTargetAddress(rinfo->target_address());
Object* new_pointer = old_pointer;
VisitPointer(&new_pointer);
DCHECK_EQ(old_pointer, new_pointer);
}
void ObjectVisitor::VisitCodeAgeSequence(RelocInfo* rinfo) {
DCHECK(RelocInfo::IsCodeAgeSequence(rinfo->rmode()));
Object* old_pointer = rinfo->code_age_stub();
Object* new_pointer = old_pointer;
if (old_pointer != nullptr) {
VisitPointer(&new_pointer);
DCHECK_EQ(old_pointer, new_pointer);
}
}
void ObjectVisitor::VisitCodeEntry(Address entry_address) {
Object* old_pointer = Code::GetObjectFromEntryAddress(entry_address);
Object* new_pointer = old_pointer;
VisitPointer(&new_pointer);
DCHECK_EQ(old_pointer, new_pointer);
}
void ObjectVisitor::VisitCell(RelocInfo* rinfo) {
DCHECK(rinfo->rmode() == RelocInfo::CELL);
Object* old_pointer = rinfo->target_cell();
Object* new_pointer = old_pointer;
VisitPointer(&new_pointer);
DCHECK_EQ(old_pointer, new_pointer);
}
void ObjectVisitor::VisitDebugTarget(RelocInfo* rinfo) {
DCHECK(RelocInfo::IsDebugBreakSlot(rinfo->rmode()) &&
rinfo->IsPatchedDebugBreakSlotSequence());
Object* old_pointer =
Code::GetCodeFromTargetAddress(rinfo->debug_call_address());
Object* new_pointer = old_pointer;
VisitPointer(&new_pointer);
DCHECK_EQ(old_pointer, new_pointer);
}
void ObjectVisitor::VisitEmbeddedPointer(RelocInfo* rinfo) {
DCHECK(rinfo->rmode() == RelocInfo::EMBEDDED_OBJECT);
Object* old_pointer = rinfo->target_object();
Object* new_pointer = old_pointer;
VisitPointer(&new_pointer);
DCHECK_EQ(old_pointer, new_pointer);
}
void ObjectVisitor::VisitExternalReference(RelocInfo* rinfo) {
Address old_reference = rinfo->target_external_reference();
Address new_reference = old_reference;
VisitExternalReference(&new_reference);
DCHECK_EQ(old_reference, new_reference);
}
void Code::InvalidateRelocation() {
InvalidateEmbeddedObjects();
set_relocation_info(GetHeap()->empty_byte_array());
}
void Code::InvalidateEmbeddedObjects() {
Object* undefined = GetHeap()->undefined_value();
Cell* undefined_cell = GetHeap()->undefined_cell();
int mode_mask = RelocInfo::ModeMask(RelocInfo::EMBEDDED_OBJECT) |
RelocInfo::ModeMask(RelocInfo::CELL);
for (RelocIterator it(this, mode_mask); !it.done(); it.next()) {
RelocInfo::Mode mode = it.rinfo()->rmode();
if (mode == RelocInfo::EMBEDDED_OBJECT) {
it.rinfo()->set_target_object(undefined, SKIP_WRITE_BARRIER);
} else if (mode == RelocInfo::CELL) {
it.rinfo()->set_target_cell(undefined_cell, SKIP_WRITE_BARRIER);
}
}
}
void Code::Relocate(intptr_t delta) {
for (RelocIterator it(this, RelocInfo::kApplyMask); !it.done(); it.next()) {
it.rinfo()->apply(delta);
}
Assembler::FlushICache(GetIsolate(), instruction_start(), instruction_size());
}
void Code::CopyFrom(const CodeDesc& desc) {
// copy code
CopyBytes(instruction_start(), desc.buffer,
static_cast<size_t>(desc.instr_size));
// copy unwinding info, if any
if (desc.unwinding_info) {
DCHECK_GT(desc.unwinding_info_size, 0);
set_unwinding_info_size(desc.unwinding_info_size);
CopyBytes(unwinding_info_start(), desc.unwinding_info,
static_cast<size_t>(desc.unwinding_info_size));
}
// copy reloc info
CopyBytes(relocation_start(),
desc.buffer + desc.buffer_size - desc.reloc_size,
static_cast<size_t>(desc.reloc_size));
// unbox handles and relocate
intptr_t delta = instruction_start() - desc.buffer;
int mode_mask = RelocInfo::kCodeTargetMask |
RelocInfo::ModeMask(RelocInfo::EMBEDDED_OBJECT) |
RelocInfo::ModeMask(RelocInfo::CELL) |
RelocInfo::ModeMask(RelocInfo::RUNTIME_ENTRY) |
RelocInfo::kApplyMask;
// Needed to find target_object and runtime_entry on X64
Assembler* origin = desc.origin;
AllowDeferredHandleDereference embedding_raw_address;
for (RelocIterator it(this, mode_mask); !it.done(); it.next()) {
RelocInfo::Mode mode = it.rinfo()->rmode();
if (mode == RelocInfo::EMBEDDED_OBJECT) {
Handle<Object> p = it.rinfo()->target_object_handle(origin);
it.rinfo()->set_target_object(*p, UPDATE_WRITE_BARRIER,
SKIP_ICACHE_FLUSH);
} else if (mode == RelocInfo::CELL) {
Handle<Cell> cell = it.rinfo()->target_cell_handle();
it.rinfo()->set_target_cell(*cell, UPDATE_WRITE_BARRIER,
SKIP_ICACHE_FLUSH);
} else if (RelocInfo::IsCodeTarget(mode)) {
// rewrite code handles in inline cache targets to direct
// pointers to the first instruction in the code object
Handle<Object> p = it.rinfo()->target_object_handle(origin);
Code* code = Code::cast(*p);
it.rinfo()->set_target_address(code->instruction_start(),
UPDATE_WRITE_BARRIER, SKIP_ICACHE_FLUSH);
} else if (RelocInfo::IsRuntimeEntry(mode)) {
Address p = it.rinfo()->target_runtime_entry(origin);
it.rinfo()->set_target_runtime_entry(p, UPDATE_WRITE_BARRIER,
SKIP_ICACHE_FLUSH);
} else if (mode == RelocInfo::CODE_AGE_SEQUENCE) {
Handle<Object> p = it.rinfo()->code_age_stub_handle(origin);
Code* code = Code::cast(*p);
it.rinfo()->set_code_age_stub(code, SKIP_ICACHE_FLUSH);
} else {
it.rinfo()->apply(delta);
}
}
Assembler::FlushICache(GetIsolate(), instruction_start(), instruction_size());
}
SafepointEntry Code::GetSafepointEntry(Address pc) {
SafepointTable table(this);
return table.FindEntry(pc);
}
Object* Code::FindNthObject(int n, Map* match_map) {
DCHECK(is_inline_cache_stub());
DisallowHeapAllocation no_allocation;
int mask = RelocInfo::ModeMask(RelocInfo::EMBEDDED_OBJECT);
for (RelocIterator it(this, mask); !it.done(); it.next()) {
RelocInfo* info = it.rinfo();
Object* object = info->target_object();
if (object->IsWeakCell()) object = WeakCell::cast(object)->value();
if (object->IsHeapObject()) {
if (HeapObject::cast(object)->map() == match_map) {
if (--n == 0) return object;
}
}
}
return NULL;
}
AllocationSite* Code::FindFirstAllocationSite() {
Object* result = FindNthObject(1, GetHeap()->allocation_site_map());
return (result != NULL) ? AllocationSite::cast(result) : NULL;
}
Map* Code::FindFirstMap() {
Object* result = FindNthObject(1, GetHeap()->meta_map());
return (result != NULL) ? Map::cast(result) : NULL;
}
void Code::FindAndReplace(const FindAndReplacePattern& pattern) {
DCHECK(is_inline_cache_stub() || is_handler());
DisallowHeapAllocation no_allocation;
int mask = RelocInfo::ModeMask(RelocInfo::EMBEDDED_OBJECT);
STATIC_ASSERT(FindAndReplacePattern::kMaxCount < 32);
int current_pattern = 0;
for (RelocIterator it(this, mask); !it.done(); it.next()) {
RelocInfo* info = it.rinfo();
Object* object = info->target_object();
if (object->IsHeapObject()) {
if (object->IsWeakCell()) {
object = HeapObject::cast(WeakCell::cast(object)->value());
}
Map* map = HeapObject::cast(object)->map();
if (map == *pattern.find_[current_pattern]) {
info->set_target_object(*pattern.replace_[current_pattern]);
if (++current_pattern == pattern.count_) return;
}
}
}
UNREACHABLE();
}
void Code::ClearInlineCaches() {
int mask = RelocInfo::ModeMask(RelocInfo::CODE_TARGET) |
RelocInfo::ModeMask(RelocInfo::CODE_TARGET_WITH_ID);
for (RelocIterator it(this, mask); !it.done(); it.next()) {
RelocInfo* info = it.rinfo();
Code* target(Code::GetCodeFromTargetAddress(info->target_address()));
if (target->is_inline_cache_stub()) {
ICUtility::Clear(this->GetIsolate(), info->pc(),
info->host()->constant_pool());
}
}
}
int AbstractCode::SourcePosition(int offset) {
int position = 0;
// Subtract one because the current PC is one instruction after the call site.
if (IsCode()) offset--;
for (SourcePositionTableIterator iterator(source_position_table());
!iterator.done() && iterator.code_offset() <= offset;
iterator.Advance()) {
position = iterator.source_position().ScriptOffset();
}
return position;
}
int AbstractCode::SourceStatementPosition(int offset) {
// First find the closest position.
int position = SourcePosition(offset);
// Now find the closest statement position before the position.
int statement_position = 0;
for (SourcePositionTableIterator it(source_position_table()); !it.done();
it.Advance()) {
if (it.is_statement()) {
int p = it.source_position().ScriptOffset();
if (statement_position < p && p <= position) {
statement_position = p;
}
}
}
return statement_position;
}
void JSFunction::ClearTypeFeedbackInfo() {
if (feedback_vector_cell()->value()->IsFeedbackVector()) {
FeedbackVector* vector = feedback_vector();
vector->ClearSlots(this);
}
}
BailoutId Code::TranslatePcOffsetToAstId(uint32_t pc_offset) {
DisallowHeapAllocation no_gc;
DCHECK(kind() == FUNCTION);
BackEdgeTable back_edges(this, &no_gc);
for (uint32_t i = 0; i < back_edges.length(); i++) {
if (back_edges.pc_offset(i) == pc_offset) return back_edges.ast_id(i);
}
return BailoutId::None();
}
uint32_t Code::TranslateAstIdToPcOffset(BailoutId ast_id) {
DisallowHeapAllocation no_gc;
DCHECK(kind() == FUNCTION);
BackEdgeTable back_edges(this, &no_gc);
for (uint32_t i = 0; i < back_edges.length(); i++) {
if (back_edges.ast_id(i) == ast_id) return back_edges.pc_offset(i);
}
UNREACHABLE(); // We expect to find the back edge.
return 0;
}
void Code::MakeCodeAgeSequenceYoung(byte* sequence, Isolate* isolate) {
PatchPlatformCodeAge(isolate, sequence, kNoAgeCodeAge);
}
void Code::MarkCodeAsExecuted(byte* sequence, Isolate* isolate) {
PatchPlatformCodeAge(isolate, sequence, kExecutedOnceCodeAge);
}
// NextAge defines the Code::Age state transitions during a GC cycle.
static Code::Age NextAge(Code::Age age) {
switch (age) {
case Code::kNotExecutedCodeAge: // Keep, until we've been executed.
case Code::kToBeExecutedOnceCodeAge: // Keep, until we've been executed.
case Code::kLastCodeAge: // Clamp at last Code::Age value.
return age;
case Code::kExecutedOnceCodeAge:
// Pre-age code that has only been executed once.
return static_cast<Code::Age>(Code::kPreAgedCodeAge + 1);
default:
return static_cast<Code::Age>(age + 1); // Default case: Increase age.
}
}
// IsOldAge defines the collection criteria for a Code object.
static bool IsOldAge(Code::Age age) {
return age >= Code::kIsOldCodeAge || age == Code::kNotExecutedCodeAge;
}
void Code::MakeYoung(Isolate* isolate) {
byte* sequence = FindCodeAgeSequence();
if (sequence != NULL) MakeCodeAgeSequenceYoung(sequence, isolate);
}
void Code::PreAge(Isolate* isolate) {
byte* sequence = FindCodeAgeSequence();
if (sequence != NULL) {
PatchPlatformCodeAge(isolate, sequence, kPreAgedCodeAge);
}
}
void Code::MarkToBeExecutedOnce(Isolate* isolate) {
byte* sequence = FindCodeAgeSequence();
if (sequence != NULL) {
PatchPlatformCodeAge(isolate, sequence, kToBeExecutedOnceCodeAge);
}
}
void Code::MakeOlder() {
byte* sequence = FindCodeAgeSequence();
if (sequence != NULL) {
Isolate* isolate = GetIsolate();
Age age = GetCodeAge(isolate, sequence);
Age next_age = NextAge(age);
if (age != next_age) {
PatchPlatformCodeAge(isolate, sequence, next_age);
}
}
}
bool Code::IsOld() {
return IsOldAge(GetAge());
}
byte* Code::FindCodeAgeSequence() {
return FLAG_age_code &&
prologue_offset() != Code::kPrologueOffsetNotSet &&
(kind() == OPTIMIZED_FUNCTION ||
(kind() == FUNCTION && !has_debug_break_slots()))
? instruction_start() + prologue_offset()
: NULL;
}
Code::Age Code::GetAge() {
byte* sequence = FindCodeAgeSequence();
if (sequence == NULL) {
return kNoAgeCodeAge;
}
return GetCodeAge(GetIsolate(), sequence);
}
Code::Age Code::GetAgeOfCodeAgeStub(Code* code) {
Isolate* isolate = code->GetIsolate();
Builtins* builtins = isolate->builtins();
#define HANDLE_CODE_AGE(AGE) \
if (code == *builtins->Make##AGE##CodeYoungAgain()) { \
return k##AGE##CodeAge; \
}
CODE_AGE_LIST(HANDLE_CODE_AGE)
#undef HANDLE_CODE_AGE
if (code == *builtins->MarkCodeAsExecutedOnce()) {
return kNotExecutedCodeAge;
}
if (code == *builtins->MarkCodeAsExecutedTwice()) {
return kExecutedOnceCodeAge;
}
if (code == *builtins->MarkCodeAsToBeExecutedOnce()) {
return kToBeExecutedOnceCodeAge;
}
UNREACHABLE();
return kNoAgeCodeAge;
}
Code* Code::GetCodeAgeStub(Isolate* isolate, Age age) {
Builtins* builtins = isolate->builtins();
switch (age) {
#define HANDLE_CODE_AGE(AGE) \
case k##AGE##CodeAge: { \
return *builtins->Make##AGE##CodeYoungAgain(); \
}
CODE_AGE_LIST(HANDLE_CODE_AGE)
#undef HANDLE_CODE_AGE
case kNotExecutedCodeAge: {
return *builtins->MarkCodeAsExecutedOnce();
}
case kExecutedOnceCodeAge: {
return *builtins->MarkCodeAsExecutedTwice();
}
case kToBeExecutedOnceCodeAge: {
return *builtins->MarkCodeAsToBeExecutedOnce();
}
default:
UNREACHABLE();
break;
}
return NULL;
}
void Code::PrintDeoptLocation(FILE* out, Address pc) {
Deoptimizer::DeoptInfo info = Deoptimizer::GetDeoptInfo(this, pc);
class SourcePosition pos = info.position;
if (info.deopt_reason != DeoptimizeReason::kNoReason || pos.IsKnown()) {
if (FLAG_hydrogen_track_positions) {
PrintF(out, " ;;; deoptimize at %d_%d: %s\n", pos.InliningId(),
pos.ScriptOffset(), DeoptimizeReasonToString(info.deopt_reason));
} else {
PrintF(out, " ;;; deoptimize at ");
OFStream outstr(out);
pos.Print(outstr, this);
PrintF(out, ", %s\n", DeoptimizeReasonToString(info.deopt_reason));
}
}
}
bool Code::CanDeoptAt(Address pc) {
DeoptimizationInputData* deopt_data =
DeoptimizationInputData::cast(deoptimization_data());
Address code_start_address = instruction_start();
for (int i = 0; i < deopt_data->DeoptCount(); i++) {
if (deopt_data->Pc(i)->value() == -1) continue;
Address address = code_start_address + deopt_data->Pc(i)->value();
if (address == pc && deopt_data->AstId(i) != BailoutId::None()) {
return true;
}
}
return false;
}
// Identify kind of code.
const char* Code::Kind2String(Kind kind) {
switch (kind) {
#define CASE(name) case name: return #name;
CODE_KIND_LIST(CASE)
#undef CASE
case NUMBER_OF_KINDS: break;
}
UNREACHABLE();
return NULL;
}
// Identify kind of code.
const char* AbstractCode::Kind2String(Kind kind) {
if (kind < AbstractCode::INTERPRETED_FUNCTION)
return Code::Kind2String((Code::Kind)kind);
if (kind == AbstractCode::INTERPRETED_FUNCTION) return "INTERPRETED_FUNCTION";
UNREACHABLE();
return NULL;
}
Handle<WeakCell> Code::WeakCellFor(Handle<Code> code) {
DCHECK(code->kind() == OPTIMIZED_FUNCTION);
WeakCell* raw_cell = code->CachedWeakCell();
if (raw_cell != NULL) return Handle<WeakCell>(raw_cell);
Handle<WeakCell> cell = code->GetIsolate()->factory()->NewWeakCell(code);
DeoptimizationInputData::cast(code->deoptimization_data())
->SetWeakCellCache(*cell);
return cell;
}
WeakCell* Code::CachedWeakCell() {
DCHECK(kind() == OPTIMIZED_FUNCTION);
Object* weak_cell_cache =
DeoptimizationInputData::cast(deoptimization_data())->WeakCellCache();
if (weak_cell_cache->IsWeakCell()) {
DCHECK(this == WeakCell::cast(weak_cell_cache)->value());
return WeakCell::cast(weak_cell_cache);
}
return NULL;
}
#if defined(OBJECT_PRINT) || defined(ENABLE_DISASSEMBLER)
const char* Code::ICState2String(InlineCacheState state) {
switch (state) {
case UNINITIALIZED:
return "UNINITIALIZED";
case PREMONOMORPHIC:
return "PREMONOMORPHIC";
case MONOMORPHIC:
return "MONOMORPHIC";
case RECOMPUTE_HANDLER:
return "RECOMPUTE_HANDLER";
case POLYMORPHIC:
return "POLYMORPHIC";
case MEGAMORPHIC:
return "MEGAMORPHIC";
case GENERIC:
return "GENERIC";
}
UNREACHABLE();
return NULL;
}
void Code::PrintExtraICState(std::ostream& os, // NOLINT
Kind kind, ExtraICState extra) {
os << "extra_ic_state = ";
if ((kind == STORE_IC || kind == KEYED_STORE_IC) &&
is_strict(static_cast<LanguageMode>(extra))) {
os << "STRICT\n";
} else {
os << extra << "\n";
}
}
#endif // defined(OBJECT_PRINT) || defined(ENABLE_DISASSEMBLER)
#ifdef ENABLE_DISASSEMBLER
void DeoptimizationInputData::DeoptimizationInputDataPrint(
std::ostream& os) { // NOLINT
disasm::NameConverter converter;
int const inlined_function_count = InlinedFunctionCount()->value();
os << "Inlined functions (count = " << inlined_function_count << ")\n";
for (int id = 0; id < inlined_function_count; ++id) {
Object* info = LiteralArray()->get(id);
os << " " << Brief(SharedFunctionInfo::cast(info)) << "\n";
}
os << "\n";
int deopt_count = DeoptCount();
os << "Deoptimization Input Data (deopt points = " << deopt_count << ")\n";
if (0 != deopt_count) {
os << " index ast id argc pc";
if (FLAG_print_code_verbose) os << " commands";
os << "\n";
}
for (int i = 0; i < deopt_count; i++) {
os << std::setw(6) << i << " " << std::setw(6) << AstId(i).ToInt() << " "
<< std::setw(6) << ArgumentsStackHeight(i)->value() << " "
<< std::setw(6) << Pc(i)->value();
if (!FLAG_print_code_verbose) {
os << "\n";
continue;
}
// Print details of the frame translation.
int translation_index = TranslationIndex(i)->value();
TranslationIterator iterator(TranslationByteArray(), translation_index);
Translation::Opcode opcode =
static_cast<Translation::Opcode>(iterator.Next());
DCHECK(Translation::BEGIN == opcode);
int frame_count = iterator.Next();
int jsframe_count = iterator.Next();
os << " " << Translation::StringFor(opcode)
<< " {frame count=" << frame_count
<< ", js frame count=" << jsframe_count << "}\n";
while (iterator.HasNext() &&
Translation::BEGIN !=
(opcode = static_cast<Translation::Opcode>(iterator.Next()))) {
os << std::setw(31) << " " << Translation::StringFor(opcode) << " ";
switch (opcode) {
case Translation::BEGIN:
UNREACHABLE();
break;
case Translation::JS_FRAME: {
int ast_id = iterator.Next();
int shared_info_id = iterator.Next();
unsigned height = iterator.Next();
Object* shared_info = LiteralArray()->get(shared_info_id);
os << "{ast_id=" << ast_id << ", function="
<< Brief(SharedFunctionInfo::cast(shared_info)->DebugName())
<< ", height=" << height << "}";
break;
}
case Translation::INTERPRETED_FRAME: {
int bytecode_offset = iterator.Next();
int shared_info_id = iterator.Next();
unsigned height = iterator.Next();
Object* shared_info = LiteralArray()->get(shared_info_id);
os << "{bytecode_offset=" << bytecode_offset << ", function="
<< Brief(SharedFunctionInfo::cast(shared_info)->DebugName())
<< ", height=" << height << "}";
break;
}
case Translation::CONSTRUCT_STUB_FRAME: {
int bailout_id = iterator.Next();
int shared_info_id = iterator.Next();
Object* shared_info = LiteralArray()->get(shared_info_id);
unsigned height = iterator.Next();
os << "{bailout_id=" << bailout_id << ", function="
<< Brief(SharedFunctionInfo::cast(shared_info)->DebugName())
<< ", height=" << height << "}";
break;
}
case Translation::COMPILED_STUB_FRAME: {
Code::Kind stub_kind = static_cast<Code::Kind>(iterator.Next());
os << "{kind=" << stub_kind << "}";
break;
}
case Translation::ARGUMENTS_ADAPTOR_FRAME: {
int shared_info_id = iterator.Next();
Object* shared_info = LiteralArray()->get(shared_info_id);
unsigned height = iterator.Next();
os << "{function="
<< Brief(SharedFunctionInfo::cast(shared_info)->DebugName())
<< ", height=" << height << "}";
break;
}
case Translation::TAIL_CALLER_FRAME: {
int shared_info_id = iterator.Next();
Object* shared_info = LiteralArray()->get(shared_info_id);
os << "{function="
<< Brief(SharedFunctionInfo::cast(shared_info)->DebugName())
<< "}";
break;
}
case Translation::GETTER_STUB_FRAME:
case Translation::SETTER_STUB_FRAME: {
int shared_info_id = iterator.Next();
Object* shared_info = LiteralArray()->get(shared_info_id);
os << "{function=" << Brief(SharedFunctionInfo::cast(shared_info)
->DebugName()) << "}";
break;
}
case Translation::REGISTER: {
int reg_code = iterator.Next();
os << "{input=" << converter.NameOfCPURegister(reg_code) << "}";
break;
}
case Translation::INT32_REGISTER: {
int reg_code = iterator.Next();
os << "{input=" << converter.NameOfCPURegister(reg_code) << "}";
break;
}
case Translation::UINT32_REGISTER: {
int reg_code = iterator.Next();
os << "{input=" << converter.NameOfCPURegister(reg_code)
<< " (unsigned)}";
break;
}
case Translation::BOOL_REGISTER: {
int reg_code = iterator.Next();
os << "{input=" << converter.NameOfCPURegister(reg_code)
<< " (bool)}";
break;
}
case Translation::FLOAT_REGISTER: {
int reg_code = iterator.Next();
os << "{input="
<< RegisterConfiguration::Crankshaft()->GetFloatRegisterName(
reg_code)
<< "}";
break;
}
case Translation::DOUBLE_REGISTER: {
int reg_code = iterator.Next();
os << "{input="
<< RegisterConfiguration::Crankshaft()->GetDoubleRegisterName(
reg_code)
<< "}";
break;
}
case Translation::STACK_SLOT: {
int input_slot_index = iterator.Next();
os << "{input=" << input_slot_index << "}";
break;
}
case Translation::INT32_STACK_SLOT: {
int input_slot_index = iterator.Next();
os << "{input=" << input_slot_index << "}";
break;
}
case Translation::UINT32_STACK_SLOT: {
int input_slot_index = iterator.Next();
os << "{input=" << input_slot_index << " (unsigned)}";
break;
}
case Translation::BOOL_STACK_SLOT: {
int input_slot_index = iterator.Next();
os << "{input=" << input_slot_index << " (bool)}";
break;
}
case Translation::FLOAT_STACK_SLOT:
case Translation::DOUBLE_STACK_SLOT: {
int input_slot_index = iterator.Next();
os << "{input=" << input_slot_index << "}";
break;
}
case Translation::LITERAL: {
int literal_index = iterator.Next();
Object* literal_value = LiteralArray()->get(literal_index);
os << "{literal_id=" << literal_index << " (" << Brief(literal_value)
<< ")}";
break;
}
case Translation::DUPLICATED_OBJECT: {
int object_index = iterator.Next();
os << "{object_index=" << object_index << "}";
break;
}
case Translation::ARGUMENTS_OBJECT:
case Translation::CAPTURED_OBJECT: {
int args_length = iterator.Next();
os << "{length=" << args_length << "}";
break;
}
}
os << "\n";
}
}
}
void DeoptimizationOutputData::DeoptimizationOutputDataPrint(
std::ostream& os) { // NOLINT
os << "Deoptimization Output Data (deopt points = " << this->DeoptPoints()
<< ")\n";
if (this->DeoptPoints() == 0) return;
os << "ast id pc state\n";
for (int i = 0; i < this->DeoptPoints(); i++) {
int pc_and_state = this->PcAndState(i)->value();
os << std::setw(6) << this->AstId(i).ToInt() << " " << std::setw(8)
<< FullCodeGenerator::PcField::decode(pc_and_state) << " "
<< Deoptimizer::BailoutStateToString(
FullCodeGenerator::BailoutStateField::decode(pc_and_state))
<< "\n";
}
}
void HandlerTable::HandlerTableRangePrint(std::ostream& os) {
os << " from to hdlr\n";
for (int i = 0; i < length(); i += kRangeEntrySize) {
int pc_start = Smi::cast(get(i + kRangeStartIndex))->value();
int pc_end = Smi::cast(get(i + kRangeEndIndex))->value();
int handler_field = Smi::cast(get(i + kRangeHandlerIndex))->value();
int handler_offset = HandlerOffsetField::decode(handler_field);
CatchPrediction prediction = HandlerPredictionField::decode(handler_field);
int data = Smi::cast(get(i + kRangeDataIndex))->value();
os << " (" << std::setw(4) << pc_start << "," << std::setw(4) << pc_end
<< ") -> " << std::setw(4) << handler_offset
<< " (prediction=" << prediction << ", data=" << data << ")\n";
}
}
void HandlerTable::HandlerTableReturnPrint(std::ostream& os) {
os << " off hdlr (c)\n";
for (int i = 0; i < length(); i += kReturnEntrySize) {
int pc_offset = Smi::cast(get(i + kReturnOffsetIndex))->value();
int handler_field = Smi::cast(get(i + kReturnHandlerIndex))->value();
int handler_offset = HandlerOffsetField::decode(handler_field);
CatchPrediction prediction = HandlerPredictionField::decode(handler_field);
os << " " << std::setw(4) << pc_offset << " -> " << std::setw(4)
<< handler_offset << " (prediction=" << prediction << ")\n";
}
}
void Code::Disassemble(const char* name, std::ostream& os) { // NOLINT
os << "kind = " << Kind2String(kind()) << "\n";
if (IsCodeStubOrIC()) {
const char* n = CodeStub::MajorName(CodeStub::GetMajorKey(this));
os << "major_key = " << (n == NULL ? "null" : n) << "\n";
}
if (is_inline_cache_stub()) {
if (!IC::ICUseVector(kind())) {
InlineCacheState ic_state = IC::StateFromCode(this);
os << "ic_state = " << ICState2String(ic_state) << "\n";
PrintExtraICState(os, kind(), extra_ic_state());
}
if (is_compare_ic_stub()) {
DCHECK(CodeStub::GetMajorKey(this) == CodeStub::CompareIC);
CompareICStub stub(stub_key(), GetIsolate());
os << "compare_state = " << CompareICState::GetStateName(stub.left())
<< "*" << CompareICState::GetStateName(stub.right()) << " -> "
<< CompareICState::GetStateName(stub.state()) << "\n";
os << "compare_operation = " << Token::Name(stub.op()) << "\n";
}
}
if ((name != nullptr) && (name[0] != '\0')) {
os << "name = " << name << "\n";
} else if (kind() == BUILTIN) {
name = GetIsolate()->builtins()->Lookup(instruction_start());
if (name != nullptr) {
os << "name = " << name << "\n";
}
} else if (kind() == BYTECODE_HANDLER) {
name = GetIsolate()->interpreter()->LookupNameOfBytecodeHandler(this);
if (name != nullptr) {
os << "name = " << name << "\n";
}
}
if (kind() == OPTIMIZED_FUNCTION) {
os << "stack_slots = " << stack_slots() << "\n";
}
os << "compiler = " << (is_turbofanned()
? "turbofan"
: is_crankshafted() ? "crankshaft"
: kind() == Code::FUNCTION
? "full-codegen"
: "unknown") << "\n";
os << "Instructions (size = " << instruction_size() << ")\n";
{
Isolate* isolate = GetIsolate();
int size = instruction_size();
int safepoint_offset =
is_crankshafted() ? static_cast<int>(safepoint_table_offset()) : size;
int back_edge_offset = (kind() == Code::FUNCTION)
? static_cast<int>(back_edge_table_offset())
: size;
int constant_pool_offset = FLAG_enable_embedded_constant_pool
? this->constant_pool_offset()
: size;
// Stop before reaching any embedded tables
int code_size = Min(safepoint_offset, back_edge_offset);
code_size = Min(code_size, constant_pool_offset);
byte* begin = instruction_start();
byte* end = begin + code_size;
Disassembler::Decode(isolate, &os, begin, end, this);
if (constant_pool_offset < size) {
int constant_pool_size = size - constant_pool_offset;
DCHECK((constant_pool_size & kPointerAlignmentMask) == 0);
os << "\nConstant Pool (size = " << constant_pool_size << ")\n";
Vector<char> buf = Vector<char>::New(50);
intptr_t* ptr = reinterpret_cast<intptr_t*>(begin + constant_pool_offset);
for (int i = 0; i < constant_pool_size; i += kPointerSize, ptr++) {
SNPrintF(buf, "%4d %08" V8PRIxPTR, i, *ptr);
os << static_cast<const void*>(ptr) << " " << buf.start() << "\n";
}
}
}
os << "\n";
SourcePositionTableIterator it(source_position_table());
if (!it.done()) {
os << "Source positions:\n pc offset position\n";
for (; !it.done(); it.Advance()) {
os << std::setw(10) << it.code_offset() << std::setw(10)
<< it.source_position().ScriptOffset()
<< (it.is_statement() ? " statement" : "") << "\n";
}
os << "\n";
}
if (kind() == FUNCTION) {
DeoptimizationOutputData* data =
DeoptimizationOutputData::cast(this->deoptimization_data());
data->DeoptimizationOutputDataPrint(os);
} else if (kind() == OPTIMIZED_FUNCTION) {
DeoptimizationInputData* data =
DeoptimizationInputData::cast(this->deoptimization_data());
data->DeoptimizationInputDataPrint(os);
}
os << "\n";
if (is_crankshafted()) {
SafepointTable table(this);
os << "Safepoints (size = " << table.size() << ")\n";
for (unsigned i = 0; i < table.length(); i++) {
unsigned pc_offset = table.GetPcOffset(i);
os << static_cast<const void*>(instruction_start() + pc_offset) << " ";
os << std::setw(4) << pc_offset << " ";
table.PrintEntry(i, os);
os << " (sp -> fp) ";
SafepointEntry entry = table.GetEntry(i);
if (entry.deoptimization_index() != Safepoint::kNoDeoptimizationIndex) {
os << std::setw(6) << entry.deoptimization_index();
} else {
os << "<none>";
}
if (entry.argument_count() > 0) {
os << " argc: " << entry.argument_count();
}
os << "\n";
}
os << "\n";
} else if (kind() == FUNCTION) {
unsigned offset = back_edge_table_offset();
// If there is no back edge table, the "table start" will be at or after
// (due to alignment) the end of the instruction stream.
if (static_cast<int>(offset) < instruction_size()) {
DisallowHeapAllocation no_gc;
BackEdgeTable back_edges(this, &no_gc);
os << "Back edges (size = " << back_edges.length() << ")\n";
os << "ast_id pc_offset loop_depth\n";
for (uint32_t i = 0; i < back_edges.length(); i++) {
os << std::setw(6) << back_edges.ast_id(i).ToInt() << " "
<< std::setw(9) << back_edges.pc_offset(i) << " " << std::setw(10)
<< back_edges.loop_depth(i) << "\n";
}
os << "\n";
}
#ifdef OBJECT_PRINT
if (!type_feedback_info()->IsUndefined(GetIsolate())) {
TypeFeedbackInfo::cast(type_feedback_info())->TypeFeedbackInfoPrint(os);
os << "\n";
}
#endif
}
if (handler_table()->length() > 0) {
os << "Handler Table (size = " << handler_table()->Size() << ")\n";
if (kind() == FUNCTION) {
HandlerTable::cast(handler_table())->HandlerTableRangePrint(os);
} else if (kind() == OPTIMIZED_FUNCTION) {
HandlerTable::cast(handler_table())->HandlerTableReturnPrint(os);
}
os << "\n";
}
os << "RelocInfo (size = " << relocation_size() << ")\n";
for (RelocIterator it(this); !it.done(); it.next()) {
it.rinfo()->Print(GetIsolate(), os);
}
os << "\n";
if (has_unwinding_info()) {
os << "UnwindingInfo (size = " << unwinding_info_size() << ")\n";
EhFrameDisassembler eh_frame_disassembler(unwinding_info_start(),
unwinding_info_end());
eh_frame_disassembler.DisassembleToStream(os);
os << "\n";
}
}
#endif // ENABLE_DISASSEMBLER
void BytecodeArray::Disassemble(std::ostream& os) {
os << "Parameter count " << parameter_count() << "\n";
os << "Frame size " << frame_size() << "\n";
const uint8_t* base_address = GetFirstBytecodeAddress();
SourcePositionTableIterator source_positions(source_position_table());
interpreter::BytecodeArrayIterator iterator(handle(this));
while (!iterator.done()) {
if (!source_positions.done() &&
iterator.current_offset() == source_positions.code_offset()) {
os << std::setw(5) << source_positions.source_position().ScriptOffset();
os << (source_positions.is_statement() ? " S> " : " E> ");
source_positions.Advance();
} else {
os << " ";
}
const uint8_t* current_address = base_address + iterator.current_offset();
os << reinterpret_cast<const void*>(current_address) << " @ "
<< std::setw(4) << iterator.current_offset() << " : ";
interpreter::BytecodeDecoder::Decode(os, current_address,
parameter_count());
if (interpreter::Bytecodes::IsJump(iterator.current_bytecode())) {
const void* jump_target = base_address + iterator.GetJumpTargetOffset();
os << " (" << jump_target << " @ " << iterator.GetJumpTargetOffset()
<< ")";
}
os << std::endl;
iterator.Advance();
}
if (constant_pool()->length() > 0) {
os << "Constant pool (size = " << constant_pool()->length() << ")\n";
constant_pool()->Print();
}
#ifdef ENABLE_DISASSEMBLER
if (handler_table()->length() > 0) {
os << "Handler Table (size = " << handler_table()->Size() << ")\n";
HandlerTable::cast(handler_table())->HandlerTableRangePrint(os);
}
#endif
}
void BytecodeArray::CopyBytecodesTo(BytecodeArray* to) {
BytecodeArray* from = this;
DCHECK_EQ(from->length(), to->length());
CopyBytes(to->GetFirstBytecodeAddress(), from->GetFirstBytecodeAddress(),
from->length());
}
void BytecodeArray::MakeOlder() {
Age age = bytecode_age();
if (age < kLastBytecodeAge) {
set_bytecode_age(static_cast<Age>(age + 1));
}
DCHECK_GE(bytecode_age(), kFirstBytecodeAge);
DCHECK_LE(bytecode_age(), kLastBytecodeAge);
}
bool BytecodeArray::IsOld() const {
return bytecode_age() >= kIsOldBytecodeAge;
}
// static
void JSArray::Initialize(Handle<JSArray> array, int capacity, int length) {
DCHECK(capacity >= 0);
array->GetIsolate()->factory()->NewJSArrayStorage(
array, length, capacity, INITIALIZE_ARRAY_ELEMENTS_WITH_HOLE);
}
void JSArray::SetLength(Handle<JSArray> array, uint32_t new_length) {
// We should never end in here with a pixel or external array.
DCHECK(array->AllowsSetLength());
if (array->SetLengthWouldNormalize(new_length)) {
JSObject::NormalizeElements(array);
}
array->GetElementsAccessor()->SetLength(array, new_length);
}
// static
void Map::AddDependentCode(Handle<Map> map,
DependentCode::DependencyGroup group,
Handle<Code> code) {
Handle<WeakCell> cell = Code::WeakCellFor(code);
Handle<DependentCode> codes = DependentCode::InsertWeakCode(
Handle<DependentCode>(map->dependent_code()), group, cell);
if (*codes != map->dependent_code()) map->set_dependent_code(*codes);
}
Handle<DependentCode> DependentCode::InsertCompilationDependencies(
Handle<DependentCode> entries, DependencyGroup group,
Handle<Foreign> info) {
return Insert(entries, group, info);
}
Handle<DependentCode> DependentCode::InsertWeakCode(
Handle<DependentCode> entries, DependencyGroup group,
Handle<WeakCell> code_cell) {
return Insert(entries, group, code_cell);
}
Handle<DependentCode> DependentCode::Insert(Handle<DependentCode> entries,
DependencyGroup group,
Handle<Object> object) {
if (entries->length() == 0 || entries->group() > group) {
// There is no such group.
return DependentCode::New(group, object, entries);
}
if (entries->group() < group) {
// The group comes later in the list.
Handle<DependentCode> old_next(entries->next_link());
Handle<DependentCode> new_next = Insert(old_next, group, object);
if (!old_next.is_identical_to(new_next)) {
entries->set_next_link(*new_next);
}
return entries;
}
DCHECK_EQ(group, entries->group());
int count = entries->count();
// Check for existing entry to avoid duplicates.
for (int i = 0; i < count; i++) {
if (entries->object_at(i) == *object) return entries;
}
if (entries->length() < kCodesStartIndex + count + 1) {
entries = EnsureSpace(entries);
// Count could have changed, reload it.
count = entries->count();
}
entries->set_object_at(count, *object);
entries->set_count(count + 1);
return entries;
}
Handle<DependentCode> DependentCode::New(DependencyGroup group,
Handle<Object> object,
Handle<DependentCode> next) {
Isolate* isolate = next->GetIsolate();
Handle<DependentCode> result = Handle<DependentCode>::cast(
isolate->factory()->NewFixedArray(kCodesStartIndex + 1, TENURED));
result->set_next_link(*next);
result->set_flags(GroupField::encode(group) | CountField::encode(1));
result->set_object_at(0, *object);
return result;
}
Handle<DependentCode> DependentCode::EnsureSpace(
Handle<DependentCode> entries) {
if (entries->Compact()) return entries;
Isolate* isolate = entries->GetIsolate();
int capacity = kCodesStartIndex + DependentCode::Grow(entries->count());
int grow_by = capacity - entries->length();
return Handle<DependentCode>::cast(
isolate->factory()->CopyFixedArrayAndGrow(entries, grow_by, TENURED));
}
bool DependentCode::Compact() {
int old_count = count();
int new_count = 0;
for (int i = 0; i < old_count; i++) {
Object* obj = object_at(i);
if (!obj->IsWeakCell() || !WeakCell::cast(obj)->cleared()) {
if (i != new_count) {
copy(i, new_count);
}
new_count++;
}
}
set_count(new_count);
for (int i = new_count; i < old_count; i++) {
clear_at(i);
}
return new_count < old_count;
}
void DependentCode::UpdateToFinishedCode(DependencyGroup group, Foreign* info,
WeakCell* code_cell) {
if (this->length() == 0 || this->group() > group) {
// There is no such group.
return;
}
if (this->group() < group) {
// The group comes later in the list.
next_link()->UpdateToFinishedCode(group, info, code_cell);
return;
}
DCHECK_EQ(group, this->group());
DisallowHeapAllocation no_gc;
int count = this->count();
for (int i = 0; i < count; i++) {
if (object_at(i) == info) {
set_object_at(i, code_cell);
break;
}
}
#ifdef DEBUG
for (int i = 0; i < count; i++) {
DCHECK(object_at(i) != info);
}
#endif
}
void DependentCode::RemoveCompilationDependencies(
DependentCode::DependencyGroup group, Foreign* info) {
if (this->length() == 0 || this->group() > group) {
// There is no such group.
return;
}
if (this->group() < group) {
// The group comes later in the list.
next_link()->RemoveCompilationDependencies(group, info);
return;
}
DCHECK_EQ(group, this->group());
DisallowHeapAllocation no_allocation;
int old_count = count();
// Find compilation info wrapper.
int info_pos = -1;
for (int i = 0; i < old_count; i++) {
if (object_at(i) == info) {
info_pos = i;
break;
}
}
if (info_pos == -1) return; // Not found.
// Use the last code to fill the gap.
if (info_pos < old_count - 1) {
copy(old_count - 1, info_pos);
}
clear_at(old_count - 1);
set_count(old_count - 1);
#ifdef DEBUG
for (int i = 0; i < old_count - 1; i++) {
DCHECK(object_at(i) != info);
}
#endif
}
bool DependentCode::Contains(DependencyGroup group, WeakCell* code_cell) {
if (this->length() == 0 || this->group() > group) {
// There is no such group.
return false;
}
if (this->group() < group) {
// The group comes later in the list.
return next_link()->Contains(group, code_cell);
}
DCHECK_EQ(group, this->group());
int count = this->count();
for (int i = 0; i < count; i++) {
if (object_at(i) == code_cell) return true;
}
return false;
}
bool DependentCode::IsEmpty(DependencyGroup group) {
if (this->length() == 0 || this->group() > group) {
// There is no such group.
return true;
}
if (this->group() < group) {
// The group comes later in the list.
return next_link()->IsEmpty(group);
}
DCHECK_EQ(group, this->group());
return count() == 0;
}
bool DependentCode::MarkCodeForDeoptimization(
Isolate* isolate,
DependentCode::DependencyGroup group) {
if (this->length() == 0 || this->group() > group) {
// There is no such group.
return false;
}
if (this->group() < group) {
// The group comes later in the list.
return next_link()->MarkCodeForDeoptimization(isolate, group);
}
DCHECK_EQ(group, this->group());
DisallowHeapAllocation no_allocation_scope;
// Mark all the code that needs to be deoptimized.
bool marked = false;
bool invalidate_embedded_objects = group == kWeakCodeGroup;
int count = this->count();
for (int i = 0; i < count; i++) {
Object* obj = object_at(i);
if (obj->IsWeakCell()) {
WeakCell* cell = WeakCell::cast(obj);
if (cell->cleared()) continue;
Code* code = Code::cast(cell->value());
if (!code->marked_for_deoptimization()) {
SetMarkedForDeoptimization(code, group);
if (invalidate_embedded_objects) {
code->InvalidateEmbeddedObjects();
}
marked = true;
}
} else {
DCHECK(obj->IsForeign());
CompilationDependencies* info =
reinterpret_cast<CompilationDependencies*>(
Foreign::cast(obj)->foreign_address());
info->Abort();
}
}
for (int i = 0; i < count; i++) {
clear_at(i);
}
set_count(0);
return marked;
}
void DependentCode::DeoptimizeDependentCodeGroup(
Isolate* isolate,
DependentCode::DependencyGroup group) {
DCHECK(AllowCodeDependencyChange::IsAllowed());
DisallowHeapAllocation no_allocation_scope;
bool marked = MarkCodeForDeoptimization(isolate, group);
if (marked) Deoptimizer::DeoptimizeMarkedCode(isolate);
}
void DependentCode::SetMarkedForDeoptimization(Code* code,
DependencyGroup group) {
code->set_marked_for_deoptimization(true);
if (FLAG_trace_deopt &&
(code->deoptimization_data() != code->GetHeap()->empty_fixed_array())) {
DeoptimizationInputData* deopt_data =
DeoptimizationInputData::cast(code->deoptimization_data());
CodeTracer::Scope scope(code->GetHeap()->isolate()->GetCodeTracer());
PrintF(scope.file(), "[marking dependent code 0x%08" V8PRIxPTR
" (opt #%d) for deoptimization, reason: %s]\n",
reinterpret_cast<intptr_t>(code),
deopt_data->OptimizationId()->value(), DependencyGroupName(group));
}
}
const char* DependentCode::DependencyGroupName(DependencyGroup group) {
switch (group) {
case kWeakCodeGroup:
return "weak-code";
case kTransitionGroup:
return "transition";
case kPrototypeCheckGroup:
return "prototype-check";
case kPropertyCellChangedGroup:
return "property-cell-changed";
case kFieldOwnerGroup:
return "field-owner";
case kInitialMapChangedGroup:
return "initial-map-changed";
case kAllocationSiteTenuringChangedGroup:
return "allocation-site-tenuring-changed";
case kAllocationSiteTransitionChangedGroup:
return "allocation-site-transition-changed";
}
UNREACHABLE();
return "?";
}
Handle<Map> Map::TransitionToPrototype(Handle<Map> map,
Handle<Object> prototype,
PrototypeOptimizationMode mode) {
Handle<Map> new_map = TransitionArray::GetPrototypeTransition(map, prototype);
if (new_map.is_null()) {
new_map = Copy(map, "TransitionToPrototype");
TransitionArray::PutPrototypeTransition(map, prototype, new_map);
Map::SetPrototype(new_map, prototype, mode);
}
return new_map;
}
Maybe<bool> JSReceiver::SetPrototype(Handle<JSReceiver> object,
Handle<Object> value, bool from_javascript,
ShouldThrow should_throw) {
if (object->IsJSProxy()) {
return JSProxy::SetPrototype(Handle<JSProxy>::cast(object), value,
from_javascript, should_throw);
}
return JSObject::SetPrototype(Handle<JSObject>::cast(object), value,
from_javascript, should_throw);
}
// ES6: 9.5.2 [[SetPrototypeOf]] (V)
// static
Maybe<bool> JSProxy::SetPrototype(Handle<JSProxy> proxy, Handle<Object> value,
bool from_javascript,
ShouldThrow should_throw) {
Isolate* isolate = proxy->GetIsolate();
STACK_CHECK(isolate, Nothing<bool>());
Handle<Name> trap_name = isolate->factory()->setPrototypeOf_string();
// 1. Assert: Either Type(V) is Object or Type(V) is Null.
DCHECK(value->IsJSReceiver() || value->IsNull(isolate));
// 2. Let handler be the value of the [[ProxyHandler]] internal slot of O.
Handle<Object> handler(proxy->handler(), isolate);
// 3. If handler is null, throw a TypeError exception.
// 4. Assert: Type(handler) is Object.
if (proxy->IsRevoked()) {
isolate->Throw(*isolate->factory()->NewTypeError(
MessageTemplate::kProxyRevoked, trap_name));
return Nothing<bool>();
}
// 5. Let target be the value of the [[ProxyTarget]] internal slot.
Handle<JSReceiver> target(proxy->target(), isolate);
// 6. Let trap be ? GetMethod(handler, "getPrototypeOf").
Handle<Object> trap;
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
isolate, trap,
Object::GetMethod(Handle<JSReceiver>::cast(handler), trap_name),
Nothing<bool>());
// 7. If trap is undefined, then return target.[[SetPrototypeOf]]().
if (trap->IsUndefined(isolate)) {
return JSReceiver::SetPrototype(target, value, from_javascript,
should_throw);
}
// 8. Let booleanTrapResult be ToBoolean(? Call(trap, handler, «target, V»)).
Handle<Object> argv[] = {target, value};
Handle<Object> trap_result;
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
isolate, trap_result,
Execution::Call(isolate, trap, handler, arraysize(argv), argv),
Nothing<bool>());
bool bool_trap_result = trap_result->BooleanValue();
// 9. If booleanTrapResult is false, return false.
if (!bool_trap_result) {
RETURN_FAILURE(
isolate, should_throw,
NewTypeError(MessageTemplate::kProxyTrapReturnedFalsish, trap_name));
}
// 10. Let extensibleTarget be ? IsExtensible(target).
Maybe<bool> is_extensible = JSReceiver::IsExtensible(target);
if (is_extensible.IsNothing()) return Nothing<bool>();
// 11. If extensibleTarget is true, return true.
if (is_extensible.FromJust()) {
if (bool_trap_result) return Just(true);
RETURN_FAILURE(
isolate, should_throw,
NewTypeError(MessageTemplate::kProxyTrapReturnedFalsish, trap_name));
}
// 12. Let targetProto be ? target.[[GetPrototypeOf]]().
Handle<Object> target_proto;
ASSIGN_RETURN_ON_EXCEPTION_VALUE(isolate, target_proto,
JSReceiver::GetPrototype(isolate, target),
Nothing<bool>());
// 13. If SameValue(V, targetProto) is false, throw a TypeError exception.
if (bool_trap_result && !value->SameValue(*target_proto)) {
isolate->Throw(*isolate->factory()->NewTypeError(
MessageTemplate::kProxySetPrototypeOfNonExtensible));
return Nothing<bool>();
}
// 14. Return true.
return Just(true);
}
Maybe<bool> JSObject::SetPrototype(Handle<JSObject> object,
Handle<Object> value, bool from_javascript,
ShouldThrow should_throw) {
Isolate* isolate = object->GetIsolate();
#ifdef DEBUG
int size = object->Size();
#endif
if (from_javascript) {
if (object->IsAccessCheckNeeded() &&
!isolate->MayAccess(handle(isolate->context()), object)) {
isolate->ReportFailedAccessCheck(object);
RETURN_VALUE_IF_SCHEDULED_EXCEPTION(isolate, Nothing<bool>());
RETURN_FAILURE(isolate, should_throw,
NewTypeError(MessageTemplate::kNoAccess));
}
} else {
DCHECK(!object->IsAccessCheckNeeded());
}
Heap* heap = isolate->heap();
// Silently ignore the change if value is not a JSObject or null.
// SpiderMonkey behaves this way.
if (!value->IsJSReceiver() && !value->IsNull(isolate)) return Just(true);
bool all_extensible = object->map()->is_extensible();
Handle<JSObject> real_receiver = object;
if (from_javascript) {
// Find the first object in the chain whose prototype object is not
// hidden.
PrototypeIterator iter(isolate, real_receiver, kStartAtPrototype,
PrototypeIterator::END_AT_NON_HIDDEN);
while (!iter.IsAtEnd()) {
// Casting to JSObject is fine because hidden prototypes are never
// JSProxies.
real_receiver = PrototypeIterator::GetCurrent<JSObject>(iter);
iter.Advance();
all_extensible = all_extensible && real_receiver->map()->is_extensible();
}
}
Handle<Map> map(real_receiver->map());
// Nothing to do if prototype is already set.
if (map->prototype() == *value) return Just(true);
bool immutable_proto = map->is_immutable_proto();
if (immutable_proto) {
RETURN_FAILURE(
isolate, should_throw,
NewTypeError(MessageTemplate::kImmutablePrototypeSet, object));
}
// From 8.6.2 Object Internal Methods
// ...
// In addition, if [[Extensible]] is false the value of the [[Class]] and
// [[Prototype]] internal properties of the object may not be modified.
// ...
// Implementation specific extensions that modify [[Class]], [[Prototype]]
// or [[Extensible]] must not violate the invariants defined in the preceding
// paragraph.
if (!all_extensible) {
RETURN_FAILURE(isolate, should_throw,
NewTypeError(MessageTemplate::kNonExtensibleProto, object));
}
// Before we can set the prototype we need to be sure prototype cycles are
// prevented. It is sufficient to validate that the receiver is not in the
// new prototype chain.
if (value->IsJSReceiver()) {
for (PrototypeIterator iter(isolate, JSReceiver::cast(*value),
kStartAtReceiver);
!iter.IsAtEnd(); iter.Advance()) {
if (iter.GetCurrent<JSReceiver>() == *object) {
// Cycle detected.
RETURN_FAILURE(isolate, should_throw,
NewTypeError(MessageTemplate::kCyclicProto));
}
}
}
// Set the new prototype of the object.
isolate->UpdateArrayProtectorOnSetPrototype(real_receiver);
PrototypeOptimizationMode mode =
from_javascript ? REGULAR_PROTOTYPE : FAST_PROTOTYPE;
Handle<Map> new_map = Map::TransitionToPrototype(map, value, mode);
DCHECK(new_map->prototype() == *value);
JSObject::MigrateToMap(real_receiver, new_map);
heap->ClearInstanceofCache();
DCHECK(size == object->Size());
return Just(true);
}
// static
void JSObject::SetImmutableProto(Handle<JSObject> object) {
DCHECK(!object->IsAccessCheckNeeded()); // Never called from JS
Handle<Map> map(object->map());
// Nothing to do if prototype is already set.
if (map->is_immutable_proto()) return;
Handle<Map> new_map = Map::TransitionToImmutableProto(map);
object->set_map(*new_map);
}
void JSObject::EnsureCanContainElements(Handle<JSObject> object,
Arguments* args,
uint32_t first_arg,
uint32_t arg_count,
EnsureElementsMode mode) {
// Elements in |Arguments| are ordered backwards (because they're on the
// stack), but the method that's called here iterates over them in forward
// direction.
return EnsureCanContainElements(
object, args->arguments() - first_arg - (arg_count - 1), arg_count, mode);
}
ElementsAccessor* JSObject::GetElementsAccessor() {
return ElementsAccessor::ForKind(GetElementsKind());
}
void JSObject::ValidateElements(Handle<JSObject> object) {
#ifdef ENABLE_SLOW_DCHECKS
if (FLAG_enable_slow_asserts) {
ElementsAccessor* accessor = object->GetElementsAccessor();
accessor->Validate(object);
}
#endif
}
static bool ShouldConvertToSlowElements(JSObject* object, uint32_t capacity,
uint32_t index,
uint32_t* new_capacity) {
STATIC_ASSERT(JSObject::kMaxUncheckedOldFastElementsLength <=
JSObject::kMaxUncheckedFastElementsLength);
if (index < capacity) {
*new_capacity = capacity;
return false;
}
if (index - capacity >= JSObject::kMaxGap) return true;
*new_capacity = JSObject::NewElementsCapacity(index + 1);
DCHECK_LT(index, *new_capacity);
if (*new_capacity <= JSObject::kMaxUncheckedOldFastElementsLength ||
(*new_capacity <= JSObject::kMaxUncheckedFastElementsLength &&
object->GetHeap()->InNewSpace(object))) {
return false;
}
// If the fast-case backing storage takes up roughly three times as
// much space (in machine words) as a dictionary backing storage
// would, the object should have slow elements.
int used_elements = object->GetFastElementsUsage();
int dictionary_size = SeededNumberDictionary::ComputeCapacity(used_elements) *
SeededNumberDictionary::kEntrySize;
return 3 * static_cast<uint32_t>(dictionary_size) <= *new_capacity;
}
bool JSObject::WouldConvertToSlowElements(uint32_t index) {
if (HasFastElements()) {
Handle<FixedArrayBase> backing_store(FixedArrayBase::cast(elements()));
uint32_t capacity = static_cast<uint32_t>(backing_store->length());
uint32_t new_capacity;
return ShouldConvertToSlowElements(this, capacity, index, &new_capacity);
}
return false;
}
static ElementsKind BestFittingFastElementsKind(JSObject* object) {
if (object->HasSloppyArgumentsElements()) {
return FAST_SLOPPY_ARGUMENTS_ELEMENTS;
}
if (object->HasStringWrapperElements()) {
return FAST_STRING_WRAPPER_ELEMENTS;
}
DCHECK(object->HasDictionaryElements());
SeededNumberDictionary* dictionary = object->element_dictionary();
ElementsKind kind = FAST_HOLEY_SMI_ELEMENTS;
for (int i = 0; i < dictionary->Capacity(); i++) {
Object* key = dictionary->KeyAt(i);
if (key->IsNumber()) {
Object* value = dictionary->ValueAt(i);
if (!value->IsNumber()) return FAST_HOLEY_ELEMENTS;
if (!value->IsSmi()) {
if (!FLAG_unbox_double_arrays) return FAST_HOLEY_ELEMENTS;
kind = FAST_HOLEY_DOUBLE_ELEMENTS;
}
}
}
return kind;
}
static bool ShouldConvertToFastElements(JSObject* object,
SeededNumberDictionary* dictionary,
uint32_t index,
uint32_t* new_capacity) {
// If properties with non-standard attributes or accessors were added, we
// cannot go back to fast elements.
if (dictionary->requires_slow_elements()) return false;
// Adding a property with this index will require slow elements.
if (index >= static_cast<uint32_t>(Smi::kMaxValue)) return false;
if (object->IsJSArray()) {
Object* length = JSArray::cast(object)->length();
if (!length->IsSmi()) return false;
*new_capacity = static_cast<uint32_t>(Smi::cast(length)->value());
} else {
*new_capacity = dictionary->max_number_key() + 1;
}
*new_capacity = Max(index + 1, *new_capacity);
uint32_t dictionary_size = static_cast<uint32_t>(dictionary->Capacity()) *
SeededNumberDictionary::kEntrySize;
// Turn fast if the dictionary only saves 50% space.
return 2 * dictionary_size >= *new_capacity;
}
// static
MaybeHandle<Object> JSObject::AddDataElement(Handle<JSObject> object,
uint32_t index,
Handle<Object> value,
PropertyAttributes attributes) {
MAYBE_RETURN_NULL(
AddDataElement(object, index, value, attributes, THROW_ON_ERROR));
return value;
}
// static
Maybe<bool> JSObject::AddDataElement(Handle<JSObject> object, uint32_t index,
Handle<Object> value,
PropertyAttributes attributes,
ShouldThrow should_throw) {
DCHECK(object->map()->is_extensible());
Isolate* isolate = object->GetIsolate();
uint32_t old_length = 0;
uint32_t new_capacity = 0;
if (object->IsJSArray()) {
CHECK(JSArray::cast(*object)->length()->ToArrayLength(&old_length));
}
ElementsKind kind = object->GetElementsKind();
FixedArrayBase* elements = object->elements();
ElementsKind dictionary_kind = DICTIONARY_ELEMENTS;
if (IsSloppyArgumentsElements(kind)) {
elements = FixedArrayBase::cast(FixedArray::cast(elements)->get(1));
dictionary_kind = SLOW_SLOPPY_ARGUMENTS_ELEMENTS;
} else if (IsStringWrapperElementsKind(kind)) {
dictionary_kind = SLOW_STRING_WRAPPER_ELEMENTS;
}
if (attributes != NONE) {
kind = dictionary_kind;
} else if (elements->IsSeededNumberDictionary()) {
kind = ShouldConvertToFastElements(*object,
SeededNumberDictionary::cast(elements),
index, &new_capacity)
? BestFittingFastElementsKind(*object)
: dictionary_kind; // Overwrite in case of arguments.
} else if (ShouldConvertToSlowElements(
*object, static_cast<uint32_t>(elements->length()), index,
&new_capacity)) {
kind = dictionary_kind;
}
ElementsKind to = value->OptimalElementsKind();
if (IsHoleyElementsKind(kind) || !object->IsJSArray() || index > old_length) {
to = GetHoleyElementsKind(to);
kind = GetHoleyElementsKind(kind);
}
to = GetMoreGeneralElementsKind(kind, to);
ElementsAccessor* accessor = ElementsAccessor::ForKind(to);
accessor->Add(object, index, value, attributes, new_capacity);
if (object->IsJSArray() && index >= old_length) {
Handle<Object> new_length =
isolate->factory()->NewNumberFromUint(index + 1);
JSArray::cast(*object)->set_length(*new_length);
}
return Just(true);
}
bool JSArray::SetLengthWouldNormalize(uint32_t new_length) {
if (!HasFastElements()) return false;
uint32_t capacity = static_cast<uint32_t>(elements()->length());
uint32_t new_capacity;
return JSArray::SetLengthWouldNormalize(GetHeap(), new_length) &&
ShouldConvertToSlowElements(this, capacity, new_length - 1,
&new_capacity);
}
const double AllocationSite::kPretenureRatio = 0.85;
void AllocationSite::ResetPretenureDecision() {
set_pretenure_decision(kUndecided);
set_memento_found_count(0);
set_memento_create_count(0);
}
PretenureFlag AllocationSite::GetPretenureMode() {
PretenureDecision mode = pretenure_decision();
// Zombie objects "decide" to be untenured.
return mode == kTenure ? TENURED : NOT_TENURED;
}
bool AllocationSite::IsNestedSite() {
DCHECK(FLAG_trace_track_allocation_sites);
Object* current = GetHeap()->allocation_sites_list();
while (current->IsAllocationSite()) {
AllocationSite* current_site = AllocationSite::cast(current);
if (current_site->nested_site() == this) {
return true;
}
current = current_site->weak_next();
}
return false;
}
template <AllocationSiteUpdateMode update_or_check>
bool AllocationSite::DigestTransitionFeedback(Handle<AllocationSite> site,
ElementsKind to_kind) {
Isolate* isolate = site->GetIsolate();
bool result = false;
if (site->SitePointsToLiteral() && site->transition_info()->IsJSArray()) {
Handle<JSArray> transition_info =
handle(JSArray::cast(site->transition_info()));
ElementsKind kind = transition_info->GetElementsKind();
// if kind is holey ensure that to_kind is as well.
if (IsHoleyElementsKind(kind)) {
to_kind = GetHoleyElementsKind(to_kind);
}
if (IsMoreGeneralElementsKindTransition(kind, to_kind)) {
// If the array is huge, it's not likely to be defined in a local
// function, so we shouldn't make new instances of it very often.
uint32_t length = 0;
CHECK(transition_info->length()->ToArrayLength(&length));
if (length <= kMaximumArrayBytesToPretransition) {
if (update_or_check == AllocationSiteUpdateMode::kCheckOnly) {
return true;
}
if (FLAG_trace_track_allocation_sites) {
bool is_nested = site->IsNestedSite();
PrintF(
"AllocationSite: JSArray %p boilerplate %s updated %s->%s\n",
reinterpret_cast<void*>(*site),
is_nested ? "(nested)" : "",
ElementsKindToString(kind),
ElementsKindToString(to_kind));
}
JSObject::TransitionElementsKind(transition_info, to_kind);
site->dependent_code()->DeoptimizeDependentCodeGroup(
isolate, DependentCode::kAllocationSiteTransitionChangedGroup);
result = true;
}
}
} else {
ElementsKind kind = site->GetElementsKind();
// if kind is holey ensure that to_kind is as well.
if (IsHoleyElementsKind(kind)) {
to_kind = GetHoleyElementsKind(to_kind);
}
if (IsMoreGeneralElementsKindTransition(kind, to_kind)) {
if (update_or_check == AllocationSiteUpdateMode::kCheckOnly) return true;
if (FLAG_trace_track_allocation_sites) {
PrintF("AllocationSite: JSArray %p site updated %s->%s\n",
reinterpret_cast<void*>(*site),
ElementsKindToString(kind),
ElementsKindToString(to_kind));
}
site->SetElementsKind(to_kind);
site->dependent_code()->DeoptimizeDependentCodeGroup(
isolate, DependentCode::kAllocationSiteTransitionChangedGroup);
result = true;
}
}
return result;
}
AllocationSiteMode AllocationSite::GetMode(ElementsKind from, ElementsKind to) {
if (IsFastSmiElementsKind(from) &&
IsMoreGeneralElementsKindTransition(from, to)) {
return TRACK_ALLOCATION_SITE;
}
return DONT_TRACK_ALLOCATION_SITE;
}
const char* AllocationSite::PretenureDecisionName(PretenureDecision decision) {
switch (decision) {
case kUndecided: return "undecided";
case kDontTenure: return "don't tenure";
case kMaybeTenure: return "maybe tenure";
case kTenure: return "tenure";
case kZombie: return "zombie";
default: UNREACHABLE();
}
return NULL;
}
template <AllocationSiteUpdateMode update_or_check>
bool JSObject::UpdateAllocationSite(Handle<JSObject> object,
ElementsKind to_kind) {
if (!object->IsJSArray()) return false;
Heap* heap = object->GetHeap();
if (!heap->InNewSpace(*object)) return false;
Handle<AllocationSite> site;
{
DisallowHeapAllocation no_allocation;
AllocationMemento* memento =
heap->FindAllocationMemento<Heap::kForRuntime>(*object);
if (memento == NULL) return false;
// Walk through to the Allocation Site
site = handle(memento->GetAllocationSite());
}
return AllocationSite::DigestTransitionFeedback<update_or_check>(site,
to_kind);
}
template bool
JSObject::UpdateAllocationSite<AllocationSiteUpdateMode::kCheckOnly>(
Handle<JSObject> object, ElementsKind to_kind);
template bool JSObject::UpdateAllocationSite<AllocationSiteUpdateMode::kUpdate>(
Handle<JSObject> object, ElementsKind to_kind);
void JSObject::TransitionElementsKind(Handle<JSObject> object,
ElementsKind to_kind) {
ElementsKind from_kind = object->GetElementsKind();
if (IsFastHoleyElementsKind(from_kind)) {
to_kind = GetHoleyElementsKind(to_kind);
}
if (from_kind == to_kind) return;
// This method should never be called for any other case.
DCHECK(IsFastElementsKind(from_kind));
DCHECK(IsFastElementsKind(to_kind));
DCHECK_NE(TERMINAL_FAST_ELEMENTS_KIND, from_kind);
UpdateAllocationSite(object, to_kind);
if (object->elements() == object->GetHeap()->empty_fixed_array() ||
IsFastDoubleElementsKind(from_kind) ==
IsFastDoubleElementsKind(to_kind)) {
// No change is needed to the elements() buffer, the transition
// only requires a map change.
Handle<Map> new_map = GetElementsTransitionMap(object, to_kind);
MigrateToMap(object, new_map);
if (FLAG_trace_elements_transitions) {
Handle<FixedArrayBase> elms(object->elements());
PrintElementsTransition(stdout, object, from_kind, elms, to_kind, elms);
}
} else {
DCHECK((IsFastSmiElementsKind(from_kind) &&
IsFastDoubleElementsKind(to_kind)) ||
(IsFastDoubleElementsKind(from_kind) &&
IsFastObjectElementsKind(to_kind)));
uint32_t c = static_cast<uint32_t>(object->elements()->length());
ElementsAccessor::ForKind(to_kind)->GrowCapacityAndConvert(object, c);
}
}
// static
bool Map::IsValidElementsTransition(ElementsKind from_kind,
ElementsKind to_kind) {
// Transitions can't go backwards.
if (!IsMoreGeneralElementsKindTransition(from_kind, to_kind)) {
return false;
}
// Transitions from HOLEY -> PACKED are not allowed.
return !IsFastHoleyElementsKind(from_kind) ||
IsFastHoleyElementsKind(to_kind);
}
bool JSArray::HasReadOnlyLength(Handle<JSArray> array) {
Map* map = array->map();
// Fast path: "length" is the first fast property of arrays. Since it's not
// configurable, it's guaranteed to be the first in the descriptor array.
if (!map->is_dictionary_map()) {
DCHECK(map->instance_descriptors()->GetKey(0) ==
array->GetHeap()->length_string());
return map->instance_descriptors()->GetDetails(0).IsReadOnly();
}
Isolate* isolate = array->GetIsolate();
LookupIterator it(array, isolate->factory()->length_string(), array,
LookupIterator::OWN_SKIP_INTERCEPTOR);
CHECK_EQ(LookupIterator::ACCESSOR, it.state());
return it.IsReadOnly();
}
bool JSArray::WouldChangeReadOnlyLength(Handle<JSArray> array,
uint32_t index) {
uint32_t length = 0;
CHECK(array->length()->ToArrayLength(&length));
if (length <= index) return HasReadOnlyLength(array);
return false;
}
template <typename BackingStore>
static int FastHoleyElementsUsage(JSObject* object, BackingStore* store) {
Isolate* isolate = store->GetIsolate();
int limit = object->IsJSArray()
? Smi::cast(JSArray::cast(object)->length())->value()
: store->length();
int used = 0;
for (int i = 0; i < limit; ++i) {
if (!store->is_the_hole(isolate, i)) ++used;
}
return used;
}
int JSObject::GetFastElementsUsage() {
FixedArrayBase* store = elements();
switch (GetElementsKind()) {
case FAST_SMI_ELEMENTS:
case FAST_DOUBLE_ELEMENTS:
case FAST_ELEMENTS:
return IsJSArray() ? Smi::cast(JSArray::cast(this)->length())->value()
: store->length();
case FAST_SLOPPY_ARGUMENTS_ELEMENTS:
store = FixedArray::cast(FixedArray::cast(store)->get(1));
// Fall through.
case FAST_HOLEY_SMI_ELEMENTS:
case FAST_HOLEY_ELEMENTS:
case FAST_STRING_WRAPPER_ELEMENTS:
return FastHoleyElementsUsage(this, FixedArray::cast(store));
case FAST_HOLEY_DOUBLE_ELEMENTS:
if (elements()->length() == 0) return 0;
return FastHoleyElementsUsage(this, FixedDoubleArray::cast(store));
case SLOW_SLOPPY_ARGUMENTS_ELEMENTS:
case SLOW_STRING_WRAPPER_ELEMENTS:
case DICTIONARY_ELEMENTS:
case NO_ELEMENTS:
#define TYPED_ARRAY_CASE(Type, type, TYPE, ctype, size) \
case TYPE##_ELEMENTS: \
TYPED_ARRAYS(TYPED_ARRAY_CASE)
#undef TYPED_ARRAY_CASE
UNREACHABLE();
}
return 0;
}
// Certain compilers request function template instantiation when they
// see the definition of the other template functions in the
// class. This requires us to have the template functions put
// together, so even though this function belongs in objects-debug.cc,
// we keep it here instead to satisfy certain compilers.
#ifdef OBJECT_PRINT
template <typename Derived, typename Shape, typename Key>
void Dictionary<Derived, Shape, Key>::Print(std::ostream& os) { // NOLINT
Isolate* isolate = this->GetIsolate();
int capacity = this->Capacity();
for (int i = 0; i < capacity; i++) {
Object* k = this->KeyAt(i);
if (this->IsKey(isolate, k)) {
os << "\n ";
if (k->IsString()) {
String::cast(k)->StringPrint(os);
} else {
os << Brief(k);
}
os << ": " << Brief(this->ValueAt(i)) << " ";
this->DetailsAt(i).PrintAsSlowTo(os);
}
}
}
template <typename Derived, typename Shape, typename Key>
void Dictionary<Derived, Shape, Key>::Print() {
OFStream os(stdout);
Print(os);
}
#endif
template<typename Derived, typename Shape, typename Key>
void Dictionary<Derived, Shape, Key>::CopyValuesTo(FixedArray* elements) {
Isolate* isolate = this->GetIsolate();
int pos = 0;
int capacity = this->Capacity();
DisallowHeapAllocation no_gc;
WriteBarrierMode mode = elements->GetWriteBarrierMode(no_gc);
for (int i = 0; i < capacity; i++) {
Object* k = this->KeyAt(i);
if (this->IsKey(isolate, k)) {
elements->set(pos++, this->ValueAt(i), mode);
}
}
DCHECK(pos == elements->length());
}
MaybeHandle<Object> JSObject::GetPropertyWithInterceptor(LookupIterator* it,
bool* done) {
DCHECK_EQ(LookupIterator::INTERCEPTOR, it->state());
return GetPropertyWithInterceptorInternal(it, it->GetInterceptor(), done);
}
Maybe<bool> JSObject::HasRealNamedProperty(Handle<JSObject> object,
Handle<Name> name) {
LookupIterator it = LookupIterator::PropertyOrElement(
name->GetIsolate(), object, name, LookupIterator::OWN_SKIP_INTERCEPTOR);
return HasProperty(&it);
}
Maybe<bool> JSObject::HasRealElementProperty(Handle<JSObject> object,
uint32_t index) {
Isolate* isolate = object->GetIsolate();
LookupIterator it(isolate, object, index, object,
LookupIterator::OWN_SKIP_INTERCEPTOR);
return HasProperty(&it);
}
Maybe<bool> JSObject::HasRealNamedCallbackProperty(Handle<JSObject> object,
Handle<Name> name) {
LookupIterator it = LookupIterator::PropertyOrElement(
name->GetIsolate(), object, name, LookupIterator::OWN_SKIP_INTERCEPTOR);
Maybe<PropertyAttributes> maybe_result = GetPropertyAttributes(&it);
return maybe_result.IsJust() ? Just(it.state() == LookupIterator::ACCESSOR)
: Nothing<bool>();
}
int FixedArrayBase::GetMaxLengthForNewSpaceAllocation(ElementsKind kind) {
return ((kMaxRegularHeapObjectSize - FixedArrayBase::kHeaderSize) >>
ElementsKindToShiftSize(kind));
}
bool JSObject::WasConstructedFromApiFunction() {
auto instance_type = map()->instance_type();
bool is_api_object = instance_type == JS_API_OBJECT_TYPE ||
instance_type == JS_SPECIAL_API_OBJECT_TYPE;
#ifdef ENABLE_SLOW_DCHECKS
if (FLAG_enable_slow_asserts) {
Object* maybe_constructor = map()->GetConstructor();
if (!maybe_constructor->IsJSFunction()) return false;
JSFunction* constructor = JSFunction::cast(maybe_constructor);
if (constructor->shared()->IsApiFunction()) {
DCHECK(is_api_object);
} else {
DCHECK(!is_api_object);
}
}
#endif
return is_api_object;
}
const char* Symbol::PrivateSymbolToName() const {
Heap* heap = GetIsolate()->heap();
#define SYMBOL_CHECK_AND_PRINT(name) \
if (this == heap->name()) return #name;
PRIVATE_SYMBOL_LIST(SYMBOL_CHECK_AND_PRINT)
#undef SYMBOL_CHECK_AND_PRINT
return "UNKNOWN";
}
void Symbol::SymbolShortPrint(std::ostream& os) {
os << "<Symbol:";
if (!name()->IsUndefined(GetIsolate())) {
os << " ";
HeapStringAllocator allocator;
StringStream accumulator(&allocator);
String::cast(name())->StringShortPrint(&accumulator, false);
os << accumulator.ToCString().get();
} else {
os << " (" << PrivateSymbolToName() << ")";
}
os << ">";
}
// StringSharedKeys are used as keys in the eval cache.
class StringSharedKey : public HashTableKey {
public:
// This tuple unambiguously identifies calls to eval() or
// CreateDynamicFunction() (such as through the Function() constructor).
// * source is the string passed into eval(). For dynamic functions, this is
// the effective source for the function, some of which is implicitly
// generated.
// * shared is the shared function info for the function containing the call
// to eval(). for dynamic functions, shared is the native context closure.
// * When positive, position is the position in the source where eval is
// called. When negative, position is the negation of the position in the
// dynamic function's effective source where the ')' ends the parameters.
StringSharedKey(Handle<String> source, Handle<SharedFunctionInfo> shared,
LanguageMode language_mode, int position)
: source_(source),
shared_(shared),
language_mode_(language_mode),
position_(position) {}
bool IsMatch(Object* other) override {
DisallowHeapAllocation no_allocation;
if (!other->IsFixedArray()) {
if (!other->IsNumber()) return false;
uint32_t other_hash = static_cast<uint32_t>(other->Number());
return Hash() == other_hash;
}
FixedArray* other_array = FixedArray::cast(other);
SharedFunctionInfo* shared = SharedFunctionInfo::cast(other_array->get(0));
if (shared != *shared_) return false;
int language_unchecked = Smi::cast(other_array->get(2))->value();
DCHECK(is_valid_language_mode(language_unchecked));
LanguageMode language_mode = static_cast<LanguageMode>(language_unchecked);
if (language_mode != language_mode_) return false;
int position = Smi::cast(other_array->get(3))->value();
if (position != position_) return false;
String* source = String::cast(other_array->get(1));
return source->Equals(*source_);
}
static uint32_t StringSharedHashHelper(String* source,
SharedFunctionInfo* shared,
LanguageMode language_mode,
int position) {
uint32_t hash = source->Hash();
if (shared->HasSourceCode()) {
// Instead of using the SharedFunctionInfo pointer in the hash
// code computation, we use a combination of the hash of the
// script source code and the start position of the calling scope.
// We do this to ensure that the cache entries can survive garbage
// collection.
Script* script(Script::cast(shared->script()));
hash ^= String::cast(script->source())->Hash();
STATIC_ASSERT(LANGUAGE_END == 2);
if (is_strict(language_mode)) hash ^= 0x8000;
hash += position;
}
return hash;
}
uint32_t Hash() override {
return StringSharedHashHelper(*source_, *shared_, language_mode_,
position_);
}
uint32_t HashForObject(Object* obj) override {
DisallowHeapAllocation no_allocation;
if (obj->IsNumber()) {
return static_cast<uint32_t>(obj->Number());
}
FixedArray* other_array = FixedArray::cast(obj);
SharedFunctionInfo* shared = SharedFunctionInfo::cast(other_array->get(0));
String* source = String::cast(other_array->get(1));
int language_unchecked = Smi::cast(other_array->get(2))->value();
DCHECK(is_valid_language_mode(language_unchecked));
LanguageMode language_mode = static_cast<LanguageMode>(language_unchecked);
int position = Smi::cast(other_array->get(3))->value();
return StringSharedHashHelper(source, shared, language_mode, position);
}
Handle<Object> AsHandle(Isolate* isolate) override {
Handle<FixedArray> array = isolate->factory()->NewFixedArray(4);
array->set(0, *shared_);
array->set(1, *source_);
array->set(2, Smi::FromInt(language_mode_));
array->set(3, Smi::FromInt(position_));
return array;
}
private:
Handle<String> source_;
Handle<SharedFunctionInfo> shared_;
LanguageMode language_mode_;
int position_;
};
// static
const char* JSPromise::Status(int status) {
switch (status) {
case v8::Promise::kFulfilled:
return "resolved";
case v8::Promise::kPending:
return "pending";
case v8::Promise::kRejected:
return "rejected";
}
UNREACHABLE();
return NULL;
}
namespace {
JSRegExp::Flags RegExpFlagsFromString(Handle<String> flags, bool* success) {
JSRegExp::Flags value = JSRegExp::kNone;
int length = flags->length();
// A longer flags string cannot be valid.
if (length > 5) return JSRegExp::Flags(0);
for (int i = 0; i < length; i++) {
JSRegExp::Flag flag = JSRegExp::kNone;
switch (flags->Get(i)) {
case 'g':
flag = JSRegExp::kGlobal;
break;
case 'i':
flag = JSRegExp::kIgnoreCase;
break;
case 'm':
flag = JSRegExp::kMultiline;
break;
case 'u':
flag = JSRegExp::kUnicode;
break;
case 'y':
flag = JSRegExp::kSticky;
break;
default:
return JSRegExp::Flags(0);
}
// Duplicate flag.
if (value & flag) return JSRegExp::Flags(0);
value |= flag;
}
*success = true;
return value;
}
} // namespace
// static
MaybeHandle<JSRegExp> JSRegExp::New(Handle<String> pattern, Flags flags) {
Isolate* isolate = pattern->GetIsolate();
Handle<JSFunction> constructor = isolate->regexp_function();
Handle<JSRegExp> regexp =
Handle<JSRegExp>::cast(isolate->factory()->NewJSObject(constructor));
return JSRegExp::Initialize(regexp, pattern, flags);
}
// static
Handle<JSRegExp> JSRegExp::Copy(Handle<JSRegExp> regexp) {
Isolate* const isolate = regexp->GetIsolate();
return Handle<JSRegExp>::cast(isolate->factory()->CopyJSObject(regexp));
}
template <typename Char>
inline int CountRequiredEscapes(Handle<String> source) {
DisallowHeapAllocation no_gc;
int escapes = 0;
Vector<const Char> src = source->GetCharVector<Char>();
for (int i = 0; i < src.length(); i++) {
if (src[i] == '\\') {
// Escape. Skip next character;
i++;
} else if (src[i] == '/') {
// Not escaped forward-slash needs escape.
escapes++;
}
}
return escapes;
}
template <typename Char, typename StringType>
inline Handle<StringType> WriteEscapedRegExpSource(Handle<String> source,
Handle<StringType> result) {
DisallowHeapAllocation no_gc;
Vector<const Char> src = source->GetCharVector<Char>();
Vector<Char> dst(result->GetChars(), result->length());
int s = 0;
int d = 0;
while (s < src.length()) {
if (src[s] == '\\') {
// Escape. Copy this and next character.
dst[d++] = src[s++];
if (s == src.length()) break;
} else if (src[s] == '/') {
// Not escaped forward-slash needs escape.
dst[d++] = '\\';
}
dst[d++] = src[s++];
}
DCHECK_EQ(result->length(), d);
return result;
}
MaybeHandle<String> EscapeRegExpSource(Isolate* isolate,
Handle<String> source) {
String::Flatten(source);
if (source->length() == 0) return isolate->factory()->query_colon_string();
bool one_byte = source->IsOneByteRepresentationUnderneath();
int escapes = one_byte ? CountRequiredEscapes<uint8_t>(source)
: CountRequiredEscapes<uc16>(source);
if (escapes == 0) return source;
int length = source->length() + escapes;
if (one_byte) {
Handle<SeqOneByteString> result;
ASSIGN_RETURN_ON_EXCEPTION(isolate, result,
isolate->factory()->NewRawOneByteString(length),
String);
return WriteEscapedRegExpSource<uint8_t>(source, result);
} else {
Handle<SeqTwoByteString> result;
ASSIGN_RETURN_ON_EXCEPTION(isolate, result,
isolate->factory()->NewRawTwoByteString(length),
String);
return WriteEscapedRegExpSource<uc16>(source, result);
}
}
// static
MaybeHandle<JSRegExp> JSRegExp::Initialize(Handle<JSRegExp> regexp,
Handle<String> source,
Handle<String> flags_string) {
Isolate* isolate = source->GetIsolate();
bool success = false;
Flags flags = RegExpFlagsFromString(flags_string, &success);
if (!success) {
THROW_NEW_ERROR(
isolate,
NewSyntaxError(MessageTemplate::kInvalidRegExpFlags, flags_string),
JSRegExp);
}
return Initialize(regexp, source, flags);
}
// static
MaybeHandle<JSRegExp> JSRegExp::Initialize(Handle<JSRegExp> regexp,
Handle<String> source, Flags flags) {
Isolate* isolate = regexp->GetIsolate();
Factory* factory = isolate->factory();
// If source is the empty string we set it to "(?:)" instead as
// suggested by ECMA-262, 5th, section 15.10.4.1.
if (source->length() == 0) source = factory->query_colon_string();
Handle<String> escaped_source;
ASSIGN_RETURN_ON_EXCEPTION(isolate, escaped_source,
EscapeRegExpSource(isolate, source), JSRegExp);
RETURN_ON_EXCEPTION(isolate, RegExpImpl::Compile(regexp, source, flags),
JSRegExp);
regexp->set_source(*escaped_source);
regexp->set_flags(Smi::FromInt(flags));
Map* map = regexp->map();
Object* constructor = map->GetConstructor();
if (constructor->IsJSFunction() &&
JSFunction::cast(constructor)->initial_map() == map) {
// If we still have the original map, set in-object properties directly.
regexp->InObjectPropertyAtPut(JSRegExp::kLastIndexFieldIndex, Smi::kZero,
SKIP_WRITE_BARRIER);
} else {
// Map has changed, so use generic, but slower, method.
RETURN_ON_EXCEPTION(isolate, JSReceiver::SetProperty(
regexp, factory->lastIndex_string(),
Handle<Smi>(Smi::kZero, isolate), STRICT),
JSRegExp);
}
return regexp;
}
// RegExpKey carries the source and flags of a regular expression as key.
class RegExpKey : public HashTableKey {
public:
RegExpKey(Handle<String> string, JSRegExp::Flags flags)
: string_(string), flags_(Smi::FromInt(flags)) {}
// Rather than storing the key in the hash table, a pointer to the
// stored value is stored where the key should be. IsMatch then
// compares the search key to the found object, rather than comparing
// a key to a key.
bool IsMatch(Object* obj) override {
FixedArray* val = FixedArray::cast(obj);
return string_->Equals(String::cast(val->get(JSRegExp::kSourceIndex)))
&& (flags_ == val->get(JSRegExp::kFlagsIndex));
}
uint32_t Hash() override { return RegExpHash(*string_, flags_); }
Handle<Object> AsHandle(Isolate* isolate) override {
// Plain hash maps, which is where regexp keys are used, don't
// use this function.
UNREACHABLE();
return MaybeHandle<Object>().ToHandleChecked();
}
uint32_t HashForObject(Object* obj) override {
FixedArray* val = FixedArray::cast(obj);
return RegExpHash(String::cast(val->get(JSRegExp::kSourceIndex)),
Smi::cast(val->get(JSRegExp::kFlagsIndex)));
}
static uint32_t RegExpHash(String* string, Smi* flags) {
return string->Hash() + flags->value();
}
Handle<String> string_;
Smi* flags_;
};
Handle<Object> OneByteStringKey::AsHandle(Isolate* isolate) {
if (hash_field_ == 0) Hash();
return isolate->factory()->NewOneByteInternalizedString(string_, hash_field_);
}
Handle<Object> TwoByteStringKey::AsHandle(Isolate* isolate) {
if (hash_field_ == 0) Hash();
return isolate->factory()->NewTwoByteInternalizedString(string_, hash_field_);
}
Handle<Object> SeqOneByteSubStringKey::AsHandle(Isolate* isolate) {
if (hash_field_ == 0) Hash();
return isolate->factory()->NewOneByteInternalizedSubString(
string_, from_, length_, hash_field_);
}
bool SeqOneByteSubStringKey::IsMatch(Object* string) {
Vector<const uint8_t> chars(string_->GetChars() + from_, length_);
return String::cast(string)->IsOneByteEqualTo(chars);
}
// InternalizedStringKey carries a string/internalized-string object as key.
class InternalizedStringKey : public HashTableKey {
public:
explicit InternalizedStringKey(Handle<String> string)
: string_(String::Flatten(string)) {}
bool IsMatch(Object* string) override {
return String::cast(string)->Equals(*string_);
}
uint32_t Hash() override { return string_->Hash(); }
uint32_t HashForObject(Object* other) override {
return String::cast(other)->Hash();
}
Handle<Object> AsHandle(Isolate* isolate) override {
// Internalize the string if possible.
MaybeHandle<Map> maybe_map =
isolate->factory()->InternalizedStringMapForString(string_);
Handle<Map> map;
if (maybe_map.ToHandle(&map)) {
string_->set_map_no_write_barrier(*map);
DCHECK(string_->IsInternalizedString());
return string_;
}
if (FLAG_thin_strings) {
// External strings get special treatment, to avoid copying their
// contents.
if (string_->IsExternalOneByteString()) {
return isolate->factory()
->InternalizeExternalString<ExternalOneByteString>(string_);
} else if (string_->IsExternalTwoByteString()) {
return isolate->factory()
->InternalizeExternalString<ExternalTwoByteString>(string_);
}
}
// Otherwise allocate a new internalized string.
return isolate->factory()->NewInternalizedStringImpl(
string_, string_->length(), string_->hash_field());
}
static uint32_t StringHash(Object* obj) {
return String::cast(obj)->Hash();
}
private:
Handle<String> string_;
};
template<typename Derived, typename Shape, typename Key>
void HashTable<Derived, Shape, Key>::IteratePrefix(ObjectVisitor* v) {
BodyDescriptorBase::IteratePointers(this, 0, kElementsStartOffset, v);
}
template<typename Derived, typename Shape, typename Key>
void HashTable<Derived, Shape, Key>::IterateElements(ObjectVisitor* v) {
BodyDescriptorBase::IteratePointers(this, kElementsStartOffset,
kHeaderSize + length() * kPointerSize, v);
}
template<typename Derived, typename Shape, typename Key>
Handle<Derived> HashTable<Derived, Shape, Key>::New(
Isolate* isolate,
int at_least_space_for,
MinimumCapacity capacity_option,
PretenureFlag pretenure) {
DCHECK(0 <= at_least_space_for);
DCHECK_IMPLIES(capacity_option == USE_CUSTOM_MINIMUM_CAPACITY,
base::bits::IsPowerOfTwo32(at_least_space_for));
int capacity = (capacity_option == USE_CUSTOM_MINIMUM_CAPACITY)
? at_least_space_for
: ComputeCapacity(at_least_space_for);
if (capacity > HashTable::kMaxCapacity) {
v8::internal::Heap::FatalProcessOutOfMemory("invalid table size", true);
}
return New(isolate, capacity, pretenure);
}
template <typename Derived, typename Shape, typename Key>
Handle<Derived> HashTable<Derived, Shape, Key>::New(Isolate* isolate,
int capacity,
PretenureFlag pretenure) {
Factory* factory = isolate->factory();
int length = EntryToIndex(capacity);
Handle<FixedArray> array = factory->NewFixedArray(length, pretenure);
array->set_map_no_write_barrier(Shape::GetMap(isolate));
Handle<Derived> table = Handle<Derived>::cast(array);
table->SetNumberOfElements(0);
table->SetNumberOfDeletedElements(0);
table->SetCapacity(capacity);
return table;
}
// Find entry for key otherwise return kNotFound.
template <typename Derived, typename Shape>
int NameDictionaryBase<Derived, Shape>::FindEntry(Handle<Name> key) {
if (!key->IsUniqueName()) {
return DerivedDictionary::FindEntry(key);
}
// Optimized for unique names. Knowledge of the key type allows:
// 1. Move the check if the key is unique out of the loop.
// 2. Avoid comparing hash codes in unique-to-unique comparison.
// 3. Detect a case when a dictionary key is not unique but the key is.
// In case of positive result the dictionary key may be replaced by the
// internalized string with minimal performance penalty. It gives a chance
// to perform further lookups in code stubs (and significant performance
// boost a certain style of code).
// EnsureCapacity will guarantee the hash table is never full.
uint32_t capacity = this->Capacity();
uint32_t entry = Derived::FirstProbe(key->Hash(), capacity);
uint32_t count = 1;
Isolate* isolate = this->GetIsolate();
while (true) {
Object* element = this->KeyAt(entry);
if (element->IsUndefined(isolate)) break; // Empty entry.
if (*key == element) return entry;
DCHECK(element->IsTheHole(isolate) || element->IsUniqueName());
entry = Derived::NextProbe(entry, count++, capacity);
}
return Derived::kNotFound;
}
template<typename Derived, typename Shape, typename Key>
void HashTable<Derived, Shape, Key>::Rehash(
Handle<Derived> new_table,
Key key) {
DCHECK(NumberOfElements() < new_table->Capacity());
DisallowHeapAllocation no_gc;
WriteBarrierMode mode = new_table->GetWriteBarrierMode(no_gc);
// Copy prefix to new array.
for (int i = kPrefixStartIndex;
i < kPrefixStartIndex + Shape::kPrefixSize;
i++) {
new_table->set(i, get(i), mode);
}
// Rehash the elements.
int capacity = this->Capacity();
Heap* heap = new_table->GetHeap();
Object* the_hole = heap->the_hole_value();
Object* undefined = heap->undefined_value();
for (int i = 0; i < capacity; i++) {
uint32_t from_index = EntryToIndex(i);
Object* k = this->get(from_index);
if (k != the_hole && k != undefined) {
uint32_t hash = this->HashForObject(key, k);
uint32_t insertion_index =
EntryToIndex(new_table->FindInsertionEntry(hash));
for (int j = 0; j < Shape::kEntrySize; j++) {
new_table->set(insertion_index + j, get(from_index + j), mode);
}
}
}
new_table->SetNumberOfElements(NumberOfElements());
new_table->SetNumberOfDeletedElements(0);
}
template<typename Derived, typename Shape, typename Key>
uint32_t HashTable<Derived, Shape, Key>::EntryForProbe(
Key key,
Object* k,
int probe,
uint32_t expected) {
uint32_t hash = this->HashForObject(key, k);
uint32_t capacity = this->Capacity();
uint32_t entry = FirstProbe(hash, capacity);
for (int i = 1; i < probe; i++) {
if (entry == expected) return expected;
entry = NextProbe(entry, i, capacity);
}
return entry;
}
template<typename Derived, typename Shape, typename Key>
void HashTable<Derived, Shape, Key>::Swap(uint32_t entry1,
uint32_t entry2,
WriteBarrierMode mode) {
int index1 = EntryToIndex(entry1);
int index2 = EntryToIndex(entry2);
Object* temp[Shape::kEntrySize];
for (int j = 0; j < Shape::kEntrySize; j++) {
temp[j] = get(index1 + j);
}
for (int j = 0; j < Shape::kEntrySize; j++) {
set(index1 + j, get(index2 + j), mode);
}
for (int j = 0; j < Shape::kEntrySize; j++) {
set(index2 + j, temp[j], mode);
}
}
template<typename Derived, typename Shape, typename Key>
void HashTable<Derived, Shape, Key>::Rehash(Key key) {
DisallowHeapAllocation no_gc;
WriteBarrierMode mode = GetWriteBarrierMode(no_gc);
Isolate* isolate = GetIsolate();
uint32_t capacity = Capacity();
bool done = false;
for (int probe = 1; !done; probe++) {
// All elements at entries given by one of the first _probe_ probes
// are placed correctly. Other elements might need to be moved.
done = true;
for (uint32_t current = 0; current < capacity; current++) {
Object* current_key = KeyAt(current);
if (IsKey(isolate, current_key)) {
uint32_t target = EntryForProbe(key, current_key, probe, current);
if (current == target) continue;
Object* target_key = KeyAt(target);
if (!IsKey(target_key) ||
EntryForProbe(key, target_key, probe, target) != target) {
// Put the current element into the correct position.
Swap(current, target, mode);
// The other element will be processed on the next iteration.
current--;
} else {
// The place for the current element is occupied. Leave the element
// for the next probe.
done = false;
}
}
}
}
// Wipe deleted entries.
Object* the_hole = isolate->heap()->the_hole_value();
Object* undefined = isolate->heap()->undefined_value();
for (uint32_t current = 0; current < capacity; current++) {
if (KeyAt(current) == the_hole) {
set(EntryToIndex(current) + Derived::kEntryKeyIndex, undefined);
}
}
SetNumberOfDeletedElements(0);
}
template<typename Derived, typename Shape, typename Key>
Handle<Derived> HashTable<Derived, Shape, Key>::EnsureCapacity(
Handle<Derived> table,
int n,
Key key,
PretenureFlag pretenure) {
Isolate* isolate = table->GetIsolate();
int capacity = table->Capacity();
int nof = table->NumberOfElements() + n;
if (table->HasSufficientCapacityToAdd(n)) return table;
const int kMinCapacityForPretenure = 256;
bool should_pretenure = pretenure == TENURED ||
((capacity > kMinCapacityForPretenure) &&
!isolate->heap()->InNewSpace(*table));
Handle<Derived> new_table = HashTable::New(
isolate,
nof * 2,
USE_DEFAULT_MINIMUM_CAPACITY,
should_pretenure ? TENURED : NOT_TENURED);
table->Rehash(new_table, key);
return new_table;
}
template <typename Derived, typename Shape, typename Key>
bool HashTable<Derived, Shape, Key>::HasSufficientCapacityToAdd(
int number_of_additional_elements) {
int capacity = Capacity();
int nof = NumberOfElements() + number_of_additional_elements;
int nod = NumberOfDeletedElements();
// Return true if:
// 50% is still free after adding number_of_additional_elements elements and
// at most 50% of the free elements are deleted elements.
if ((nof < capacity) && ((nod <= (capacity - nof) >> 1))) {
int needed_free = nof >> 1;
if (nof + needed_free <= capacity) return true;
}
return false;
}
template<typename Derived, typename Shape, typename Key>
Handle<Derived> HashTable<Derived, Shape, Key>::Shrink(Handle<Derived> table,
Key key) {
int capacity = table->Capacity();
int nof = table->NumberOfElements();
// Shrink to fit the number of elements if only a quarter of the
// capacity is filled with elements.
if (nof > (capacity >> 2)) return table;
// Allocate a new dictionary with room for at least the current
// number of elements. The allocation method will make sure that
// there is extra room in the dictionary for additions. Don't go
// lower than room for 16 elements.
int at_least_room_for = nof;
if (at_least_room_for < 16) return table;
Isolate* isolate = table->GetIsolate();
const int kMinCapacityForPretenure = 256;
bool pretenure =
(at_least_room_for > kMinCapacityForPretenure) &&
!isolate->heap()->InNewSpace(*table);
Handle<Derived> new_table = HashTable::New(
isolate,
at_least_room_for,
USE_DEFAULT_MINIMUM_CAPACITY,
pretenure ? TENURED : NOT_TENURED);
table->Rehash(new_table, key);
return new_table;
}
template<typename Derived, typename Shape, typename Key>
uint32_t HashTable<Derived, Shape, Key>::FindInsertionEntry(uint32_t hash) {
uint32_t capacity = Capacity();
uint32_t entry = FirstProbe(hash, capacity);
uint32_t count = 1;
// EnsureCapacity will guarantee the hash table is never full.
Isolate* isolate = GetIsolate();
while (true) {
Object* element = KeyAt(entry);
if (!IsKey(isolate, element)) break;
entry = NextProbe(entry, count++, capacity);
}
return entry;
}
// Force instantiation of template instances class.
// Please note this list is compiler dependent.
template class HashTable<StringTable, StringTableShape, HashTableKey*>;
template class HashTable<CompilationCacheTable,
CompilationCacheShape,
HashTableKey*>;
template class HashTable<ObjectHashTable,
ObjectHashTableShape,
Handle<Object> >;
template class HashTable<WeakHashTable, WeakHashTableShape<2>, Handle<Object> >;
template class Dictionary<NameDictionary, NameDictionaryShape, Handle<Name> >;
template class Dictionary<GlobalDictionary, GlobalDictionaryShape,
Handle<Name> >;
template class Dictionary<SeededNumberDictionary,
SeededNumberDictionaryShape,
uint32_t>;
template class Dictionary<UnseededNumberDictionary,
UnseededNumberDictionaryShape,
uint32_t>;
template Handle<SeededNumberDictionary>
Dictionary<SeededNumberDictionary, SeededNumberDictionaryShape, uint32_t>::New(
Isolate*, int at_least_space_for, PretenureFlag pretenure,
MinimumCapacity capacity_option);
template Handle<SeededNumberDictionary>
Dictionary<SeededNumberDictionary, SeededNumberDictionaryShape,
uint32_t>::NewEmpty(Isolate*, PretenureFlag pretenure);
template Handle<UnseededNumberDictionary>
Dictionary<UnseededNumberDictionary, UnseededNumberDictionaryShape,
uint32_t>::New(Isolate*, int at_least_space_for,
PretenureFlag pretenure,
MinimumCapacity capacity_option);
template Handle<NameDictionary>
Dictionary<NameDictionary, NameDictionaryShape, Handle<Name>>::New(
Isolate*, int n, PretenureFlag pretenure, MinimumCapacity capacity_option);
template Handle<NameDictionary>
Dictionary<NameDictionary, NameDictionaryShape, Handle<Name>>::NewEmpty(
Isolate*, PretenureFlag pretenure);
template Handle<GlobalDictionary>
Dictionary<GlobalDictionary, GlobalDictionaryShape, Handle<Name>>::New(
Isolate*, int n, PretenureFlag pretenure, MinimumCapacity capacity_option);
template Handle<SeededNumberDictionary>
Dictionary<SeededNumberDictionary, SeededNumberDictionaryShape, uint32_t>::
AtPut(Handle<SeededNumberDictionary>, uint32_t, Handle<Object>);
template Handle<UnseededNumberDictionary>
Dictionary<UnseededNumberDictionary, UnseededNumberDictionaryShape, uint32_t>::
AtPut(Handle<UnseededNumberDictionary>, uint32_t, Handle<Object>);
template Object*
Dictionary<SeededNumberDictionary, SeededNumberDictionaryShape, uint32_t>::
SlowReverseLookup(Object* value);
template Object*
Dictionary<NameDictionary, NameDictionaryShape, Handle<Name> >::
SlowReverseLookup(Object* value);
template Handle<Object>
Dictionary<NameDictionary, NameDictionaryShape, Handle<Name> >::DeleteProperty(
Handle<NameDictionary>, int);
template Handle<Object>
Dictionary<SeededNumberDictionary, SeededNumberDictionaryShape,
uint32_t>::DeleteProperty(Handle<SeededNumberDictionary>, int);
template Handle<Object>
Dictionary<UnseededNumberDictionary, UnseededNumberDictionaryShape,
uint32_t>::DeleteProperty(Handle<UnseededNumberDictionary>, int);
template Handle<NameDictionary>
HashTable<NameDictionary, NameDictionaryShape, Handle<Name> >::
New(Isolate*, int, MinimumCapacity, PretenureFlag);
template Handle<ObjectHashSet> HashTable<ObjectHashSet, ObjectHashSetShape,
Handle<Object>>::New(Isolate*, int n,
MinimumCapacity,
PretenureFlag);
template Handle<NameDictionary>
HashTable<NameDictionary, NameDictionaryShape, Handle<Name> >::
Shrink(Handle<NameDictionary>, Handle<Name>);
template Handle<SeededNumberDictionary>
HashTable<SeededNumberDictionary, SeededNumberDictionaryShape, uint32_t>::
Shrink(Handle<SeededNumberDictionary>, uint32_t);
template Handle<UnseededNumberDictionary>
HashTable<UnseededNumberDictionary, UnseededNumberDictionaryShape,
uint32_t>::Shrink(Handle<UnseededNumberDictionary>, uint32_t);
template Handle<NameDictionary>
Dictionary<NameDictionary, NameDictionaryShape, Handle<Name>>::Add(
Handle<NameDictionary>, Handle<Name>, Handle<Object>, PropertyDetails,
int*);
template Handle<GlobalDictionary>
Dictionary<GlobalDictionary, GlobalDictionaryShape, Handle<Name>>::Add(
Handle<GlobalDictionary>, Handle<Name>, Handle<Object>, PropertyDetails,
int*);
template Handle<FixedArray> Dictionary<
NameDictionary, NameDictionaryShape,
Handle<Name> >::GenerateNewEnumerationIndices(Handle<NameDictionary>);
template Handle<SeededNumberDictionary>
Dictionary<SeededNumberDictionary, SeededNumberDictionaryShape, uint32_t>::Add(
Handle<SeededNumberDictionary>, uint32_t, Handle<Object>, PropertyDetails,
int*);
template Handle<UnseededNumberDictionary>
Dictionary<UnseededNumberDictionary, UnseededNumberDictionaryShape,
uint32_t>::Add(Handle<UnseededNumberDictionary>, uint32_t,
Handle<Object>, PropertyDetails, int*);
template Handle<SeededNumberDictionary>
Dictionary<SeededNumberDictionary, SeededNumberDictionaryShape, uint32_t>::
EnsureCapacity(Handle<SeededNumberDictionary>, int, uint32_t);
template Handle<UnseededNumberDictionary>
Dictionary<UnseededNumberDictionary, UnseededNumberDictionaryShape, uint32_t>::
EnsureCapacity(Handle<UnseededNumberDictionary>, int, uint32_t);
template void Dictionary<NameDictionary, NameDictionaryShape,
Handle<Name> >::SetRequiresCopyOnCapacityChange();
template Handle<NameDictionary>
Dictionary<NameDictionary, NameDictionaryShape, Handle<Name> >::
EnsureCapacity(Handle<NameDictionary>, int, Handle<Name>);
template int HashTable<SeededNumberDictionary, SeededNumberDictionaryShape,
uint32_t>::FindEntry(uint32_t);
template int NameDictionaryBase<NameDictionary, NameDictionaryShape>::FindEntry(
Handle<Name>);
template int Dictionary<GlobalDictionary, GlobalDictionaryShape, Handle<Name>>::
NumberOfElementsFilterAttributes(PropertyFilter filter);
template int Dictionary<NameDictionary, NameDictionaryShape, Handle<Name>>::
NumberOfElementsFilterAttributes(PropertyFilter filter);
template void
Dictionary<GlobalDictionary, GlobalDictionaryShape, Handle<Name>>::
CopyEnumKeysTo(Handle<Dictionary<GlobalDictionary, GlobalDictionaryShape,
Handle<Name>>>
dictionary,
Handle<FixedArray> storage, KeyCollectionMode mode,
KeyAccumulator* accumulator);
template void
Dictionary<NameDictionary, NameDictionaryShape, Handle<Name>>::CopyEnumKeysTo(
Handle<Dictionary<NameDictionary, NameDictionaryShape, Handle<Name>>>
dictionary,
Handle<FixedArray> storage, KeyCollectionMode mode,
KeyAccumulator* accumulator);
template Handle<FixedArray>
Dictionary<GlobalDictionary, GlobalDictionaryShape, Handle<Name>>::
IterationIndices(
Handle<
Dictionary<GlobalDictionary, GlobalDictionaryShape, Handle<Name>>>
dictionary);
template void
Dictionary<GlobalDictionary, GlobalDictionaryShape, Handle<Name>>::
CollectKeysTo(Handle<Dictionary<GlobalDictionary, GlobalDictionaryShape,
Handle<Name>>>
dictionary,
KeyAccumulator* keys);
template Handle<FixedArray>
Dictionary<NameDictionary, NameDictionaryShape, Handle<Name>>::IterationIndices(
Handle<Dictionary<NameDictionary, NameDictionaryShape, Handle<Name>>>
dictionary);
template void
Dictionary<NameDictionary, NameDictionaryShape, Handle<Name>>::CollectKeysTo(
Handle<Dictionary<NameDictionary, NameDictionaryShape, Handle<Name>>>
dictionary,
KeyAccumulator* keys);
Handle<Object> JSObject::PrepareSlowElementsForSort(
Handle<JSObject> object, uint32_t limit) {
DCHECK(object->HasDictionaryElements());
Isolate* isolate = object->GetIsolate();
// Must stay in dictionary mode, either because of requires_slow_elements,
// or because we are not going to sort (and therefore compact) all of the
// elements.
Handle<SeededNumberDictionary> dict(object->element_dictionary(), isolate);
Handle<SeededNumberDictionary> new_dict =
SeededNumberDictionary::New(isolate, dict->NumberOfElements());
uint32_t pos = 0;
uint32_t undefs = 0;
int capacity = dict->Capacity();
Handle<Smi> bailout(Smi::FromInt(-1), isolate);
// Entry to the new dictionary does not cause it to grow, as we have
// allocated one that is large enough for all entries.
DisallowHeapAllocation no_gc;
for (int i = 0; i < capacity; i++) {
Object* k = dict->KeyAt(i);
if (!dict->IsKey(isolate, k)) continue;
DCHECK(k->IsNumber());
DCHECK(!k->IsSmi() || Smi::cast(k)->value() >= 0);
DCHECK(!k->IsHeapNumber() || HeapNumber::cast(k)->value() >= 0);
DCHECK(!k->IsHeapNumber() || HeapNumber::cast(k)->value() <= kMaxUInt32);
HandleScope scope(isolate);
Handle<Object> value(dict->ValueAt(i), isolate);
PropertyDetails details = dict->DetailsAt(i);
if (details.kind() == kAccessor || details.IsReadOnly()) {
// Bail out and do the sorting of undefineds and array holes in JS.
// Also bail out if the element is not supposed to be moved.
return bailout;
}
uint32_t key = NumberToUint32(k);
if (key < limit) {
if (value->IsUndefined(isolate)) {
undefs++;
} else if (pos > static_cast<uint32_t>(Smi::kMaxValue)) {
// Adding an entry with the key beyond smi-range requires
// allocation. Bailout.
return bailout;
} else {
Handle<Object> result = SeededNumberDictionary::AddNumberEntry(
new_dict, pos, value, details, object);
DCHECK(result.is_identical_to(new_dict));
USE(result);
pos++;
}
} else if (key > static_cast<uint32_t>(Smi::kMaxValue)) {
// Adding an entry with the key beyond smi-range requires
// allocation. Bailout.
return bailout;
} else {
Handle<Object> result = SeededNumberDictionary::AddNumberEntry(
new_dict, key, value, details, object);
DCHECK(result.is_identical_to(new_dict));
USE(result);
}
}
uint32_t result = pos;
PropertyDetails no_details = PropertyDetails::Empty();
while (undefs > 0) {
if (pos > static_cast<uint32_t>(Smi::kMaxValue)) {
// Adding an entry with the key beyond smi-range requires
// allocation. Bailout.
return bailout;
}
HandleScope scope(isolate);
Handle<Object> result = SeededNumberDictionary::AddNumberEntry(
new_dict, pos, isolate->factory()->undefined_value(), no_details,
object);
DCHECK(result.is_identical_to(new_dict));
USE(result);
pos++;
undefs--;
}
object->set_elements(*new_dict);
AllowHeapAllocation allocate_return_value;
return isolate->factory()->NewNumberFromUint(result);
}
// Collects all defined (non-hole) and non-undefined (array) elements at
// the start of the elements array.
// If the object is in dictionary mode, it is converted to fast elements
// mode.
Handle<Object> JSObject::PrepareElementsForSort(Handle<JSObject> object,
uint32_t limit) {
Isolate* isolate = object->GetIsolate();
if (object->HasSloppyArgumentsElements() || !object->map()->is_extensible()) {
return handle(Smi::FromInt(-1), isolate);
}
if (object->HasStringWrapperElements()) {
int len = String::cast(Handle<JSValue>::cast(object)->value())->length();
return handle(Smi::FromInt(len), isolate);
}
if (object->HasDictionaryElements()) {
// Convert to fast elements containing only the existing properties.
// Ordering is irrelevant, since we are going to sort anyway.
Handle<SeededNumberDictionary> dict(object->element_dictionary());
if (object->IsJSArray() || dict->requires_slow_elements() ||
dict->max_number_key() >= limit) {
return JSObject::PrepareSlowElementsForSort(object, limit);
}
// Convert to fast elements.
Handle<Map> new_map =
JSObject::GetElementsTransitionMap(object, FAST_HOLEY_ELEMENTS);
PretenureFlag tenure = isolate->heap()->InNewSpace(*object) ?
NOT_TENURED: TENURED;
Handle<FixedArray> fast_elements =
isolate->factory()->NewFixedArray(dict->NumberOfElements(), tenure);
dict->CopyValuesTo(*fast_elements);
JSObject::ValidateElements(object);
JSObject::SetMapAndElements(object, new_map, fast_elements);
} else if (object->HasFixedTypedArrayElements()) {
// Typed arrays cannot have holes or undefined elements.
return handle(Smi::FromInt(
FixedArrayBase::cast(object->elements())->length()), isolate);
} else if (!object->HasFastDoubleElements()) {
EnsureWritableFastElements(object);
}
DCHECK(object->HasFastSmiOrObjectElements() ||
object->HasFastDoubleElements());
// Collect holes at the end, undefined before that and the rest at the
// start, and return the number of non-hole, non-undefined values.
Handle<FixedArrayBase> elements_base(object->elements());
uint32_t elements_length = static_cast<uint32_t>(elements_base->length());
if (limit > elements_length) {
limit = elements_length;
}
if (limit == 0) {
return handle(Smi::kZero, isolate);
}
uint32_t result = 0;
if (elements_base->map() == isolate->heap()->fixed_double_array_map()) {
FixedDoubleArray* elements = FixedDoubleArray::cast(*elements_base);
// Split elements into defined and the_hole, in that order.
unsigned int holes = limit;
// Assume most arrays contain no holes and undefined values, so minimize the
// number of stores of non-undefined, non-the-hole values.
for (unsigned int i = 0; i < holes; i++) {
if (elements->is_the_hole(i)) {
holes--;
} else {
continue;
}
// Position i needs to be filled.
while (holes > i) {
if (elements->is_the_hole(holes)) {
holes--;
} else {
elements->set(i, elements->get_scalar(holes));
break;
}
}
}
result = holes;
while (holes < limit) {
elements->set_the_hole(holes);
holes++;
}
} else {
FixedArray* elements = FixedArray::cast(*elements_base);
DisallowHeapAllocation no_gc;
// Split elements into defined, undefined and the_hole, in that order. Only
// count locations for undefined and the hole, and fill them afterwards.
WriteBarrierMode write_barrier = elements->GetWriteBarrierMode(no_gc);
unsigned int undefs = limit;
unsigned int holes = limit;
// Assume most arrays contain no holes and undefined values, so minimize the
// number of stores of non-undefined, non-the-hole values.
for (unsigned int i = 0; i < undefs; i++) {
Object* current = elements->get(i);
if (current->IsTheHole(isolate)) {
holes--;
undefs--;
} else if (current->IsUndefined(isolate)) {
undefs--;
} else {
continue;
}
// Position i needs to be filled.
while (undefs > i) {
current = elements->get(undefs);
if (current->IsTheHole(isolate)) {
holes--;
undefs--;
} else if (current->IsUndefined(isolate)) {
undefs--;
} else {
elements->set(i, current, write_barrier);
break;
}
}
}
result = undefs;
while (undefs < holes) {
elements->set_undefined(isolate, undefs);
undefs++;
}
while (holes < limit) {
elements->set_the_hole(isolate, holes);
holes++;
}
}
return isolate->factory()->NewNumberFromUint(result);
}
namespace {
bool CanonicalNumericIndexString(Isolate* isolate, Handle<Object> s,
Handle<Object>* index) {
DCHECK(s->IsString() || s->IsSmi());
Handle<Object> result;
if (s->IsSmi()) {
result = s;
} else {
result = String::ToNumber(Handle<String>::cast(s));
if (!result->IsMinusZero()) {
Handle<String> str = Object::ToString(isolate, result).ToHandleChecked();
// Avoid treating strings like "2E1" and "20" as the same key.
if (!str->SameValue(*s)) return false;
}
}
*index = result;
return true;
}
} // anonymous namespace
// ES#sec-integer-indexed-exotic-objects-defineownproperty-p-desc
// static
Maybe<bool> JSTypedArray::DefineOwnProperty(Isolate* isolate,
Handle<JSTypedArray> o,
Handle<Object> key,
PropertyDescriptor* desc,
ShouldThrow should_throw) {
// 1. Assert: IsPropertyKey(P) is true.
DCHECK(key->IsName() || key->IsNumber());
// 2. Assert: O is an Object that has a [[ViewedArrayBuffer]] internal slot.
// 3. If Type(P) is String, then
if (key->IsString() || key->IsSmi()) {
// 3a. Let numericIndex be ! CanonicalNumericIndexString(P)
// 3b. If numericIndex is not undefined, then
Handle<Object> numeric_index;
if (CanonicalNumericIndexString(isolate, key, &numeric_index)) {
// 3b i. If IsInteger(numericIndex) is false, return false.
// 3b ii. If numericIndex = -0, return false.
// 3b iii. If numericIndex < 0, return false.
// FIXME: the standard allows up to 2^53 elements.
uint32_t index;
if (numeric_index->IsMinusZero() || !numeric_index->ToUint32(&index)) {
RETURN_FAILURE(isolate, should_throw,
NewTypeError(MessageTemplate::kInvalidTypedArrayIndex));
}
// 3b iv. Let length be O.[[ArrayLength]].
uint32_t length = o->length()->Number();
// 3b v. If numericIndex ≥ length, return false.
if (index >= length) {
RETURN_FAILURE(isolate, should_throw,
NewTypeError(MessageTemplate::kInvalidTypedArrayIndex));
}
// 3b vi. If IsAccessorDescriptor(Desc) is true, return false.
if (PropertyDescriptor::IsAccessorDescriptor(desc)) {
RETURN_FAILURE(isolate, should_throw,
NewTypeError(MessageTemplate::kRedefineDisallowed, key));
}
// 3b vii. If Desc has a [[Configurable]] field and if
// Desc.[[Configurable]] is true, return false.
// 3b viii. If Desc has an [[Enumerable]] field and if Desc.[[Enumerable]]
// is false, return false.
// 3b ix. If Desc has a [[Writable]] field and if Desc.[[Writable]] is
// false, return false.
if ((desc->has_configurable() && desc->configurable()) ||
(desc->has_enumerable() && !desc->enumerable()) ||
(desc->has_writable() && !desc->writable())) {
RETURN_FAILURE(isolate, should_throw,
NewTypeError(MessageTemplate::kRedefineDisallowed, key));
}
// 3b x. If Desc has a [[Value]] field, then
// 3b x 1. Let value be Desc.[[Value]].
// 3b x 2. Return ? IntegerIndexedElementSet(O, numericIndex, value).
if (desc->has_value()) {
if (!desc->has_configurable()) desc->set_configurable(false);
if (!desc->has_enumerable()) desc->set_enumerable(true);
if (!desc->has_writable()) desc->set_writable(true);
Handle<Object> value = desc->value();
RETURN_ON_EXCEPTION_VALUE(isolate,
SetOwnElementIgnoreAttributes(
o, index, value, desc->ToAttributes()),
Nothing<bool>());
}
// 3b xi. Return true.
return Just(true);
}
}
// 4. Return ! OrdinaryDefineOwnProperty(O, P, Desc).
return OrdinaryDefineOwnProperty(isolate, o, key, desc, should_throw);
}
ExternalArrayType JSTypedArray::type() {
switch (elements()->map()->instance_type()) {
#define INSTANCE_TYPE_TO_ARRAY_TYPE(Type, type, TYPE, ctype, size) \
case FIXED_##TYPE##_ARRAY_TYPE: \
return kExternal##Type##Array;
TYPED_ARRAYS(INSTANCE_TYPE_TO_ARRAY_TYPE)
#undef INSTANCE_TYPE_TO_ARRAY_TYPE
default:
UNREACHABLE();
return static_cast<ExternalArrayType>(-1);
}
}
size_t JSTypedArray::element_size() {
switch (elements()->map()->instance_type()) {
#define INSTANCE_TYPE_TO_ELEMENT_SIZE(Type, type, TYPE, ctype, size) \
case FIXED_##TYPE##_ARRAY_TYPE: \
return size;
TYPED_ARRAYS(INSTANCE_TYPE_TO_ELEMENT_SIZE)
#undef INSTANCE_TYPE_TO_ELEMENT_SIZE
default:
UNREACHABLE();
return 0;
}
}
void JSGlobalObject::InvalidatePropertyCell(Handle<JSGlobalObject> global,
Handle<Name> name) {
DCHECK(!global->HasFastProperties());
auto dictionary = handle(global->global_dictionary());
int entry = dictionary->FindEntry(name);
if (entry == GlobalDictionary::kNotFound) return;
PropertyCell::InvalidateEntry(dictionary, entry);
}
Handle<PropertyCell> JSGlobalObject::EnsureEmptyPropertyCell(
Handle<JSGlobalObject> global, Handle<Name> name,
PropertyCellType cell_type, int* entry_out) {
Isolate* isolate = global->GetIsolate();
DCHECK(!global->HasFastProperties());
Handle<GlobalDictionary> dictionary(global->global_dictionary(), isolate);
int entry = dictionary->FindEntry(name);
Handle<PropertyCell> cell;
if (entry != GlobalDictionary::kNotFound) {
if (entry_out) *entry_out = entry;
// This call should be idempotent.
DCHECK(dictionary->ValueAt(entry)->IsPropertyCell());
cell = handle(PropertyCell::cast(dictionary->ValueAt(entry)));
PropertyCellType original_cell_type = cell->property_details().cell_type();
DCHECK(original_cell_type == PropertyCellType::kInvalidated ||
original_cell_type == PropertyCellType::kUninitialized);
DCHECK(cell->value()->IsTheHole(isolate));
if (original_cell_type == PropertyCellType::kInvalidated) {
cell = PropertyCell::InvalidateEntry(dictionary, entry);
}
PropertyDetails details(kData, NONE, 0, cell_type);
cell->set_property_details(details);
return cell;
}
cell = isolate->factory()->NewPropertyCell();
PropertyDetails details(kData, NONE, 0, cell_type);
dictionary =
GlobalDictionary::Add(dictionary, name, cell, details, entry_out);
// {*entry_out} is initialized inside GlobalDictionary::Add().
global->set_properties(*dictionary);
return cell;
}
// This class is used for looking up two character strings in the string table.
// If we don't have a hit we don't want to waste much time so we unroll the
// string hash calculation loop here for speed. Doesn't work if the two
// characters form a decimal integer, since such strings have a different hash
// algorithm.
class TwoCharHashTableKey : public HashTableKey {
public:
TwoCharHashTableKey(uint16_t c1, uint16_t c2, uint32_t seed)
: c1_(c1), c2_(c2) {
// Char 1.
uint32_t hash = seed;
hash += c1;
hash += hash << 10;
hash ^= hash >> 6;
// Char 2.
hash += c2;
hash += hash << 10;
hash ^= hash >> 6;
// GetHash.
hash += hash << 3;
hash ^= hash >> 11;
hash += hash << 15;
if ((hash & String::kHashBitMask) == 0) hash = StringHasher::kZeroHash;
hash_ = hash;
#ifdef DEBUG
// If this assert fails then we failed to reproduce the two-character
// version of the string hashing algorithm above. One reason could be
// that we were passed two digits as characters, since the hash
// algorithm is different in that case.
uint16_t chars[2] = {c1, c2};
uint32_t check_hash = StringHasher::HashSequentialString(chars, 2, seed);
hash = (hash << String::kHashShift) | String::kIsNotArrayIndexMask;
DCHECK_EQ(static_cast<int32_t>(hash), static_cast<int32_t>(check_hash));
#endif
}
bool IsMatch(Object* o) override {
if (!o->IsString()) return false;
String* other = String::cast(o);
if (other->length() != 2) return false;
if (other->Get(0) != c1_) return false;
return other->Get(1) == c2_;
}
uint32_t Hash() override { return hash_; }
uint32_t HashForObject(Object* key) override {
if (!key->IsString()) return 0;
return String::cast(key)->Hash();
}
Handle<Object> AsHandle(Isolate* isolate) override {
// The TwoCharHashTableKey is only used for looking in the string
// table, not for adding to it.
UNREACHABLE();
return MaybeHandle<Object>().ToHandleChecked();
}
private:
uint16_t c1_;
uint16_t c2_;
uint32_t hash_;
};
MaybeHandle<String> StringTable::InternalizeStringIfExists(
Isolate* isolate,
Handle<String> string) {
if (string->IsInternalizedString()) {
return string;
}
if (string->IsThinString()) {
return handle(Handle<ThinString>::cast(string)->actual(), isolate);
}
return LookupStringIfExists(isolate, string);
}
MaybeHandle<String> StringTable::LookupStringIfExists(
Isolate* isolate,
Handle<String> string) {
Handle<StringTable> string_table = isolate->factory()->string_table();
InternalizedStringKey key(string);
int entry = string_table->FindEntry(&key);
if (entry == kNotFound) {
return MaybeHandle<String>();
} else {
Handle<String> result(String::cast(string_table->KeyAt(entry)), isolate);
DCHECK(StringShape(*result).IsInternalized());
return result;
}
}
MaybeHandle<String> StringTable::LookupTwoCharsStringIfExists(
Isolate* isolate,
uint16_t c1,
uint16_t c2) {
Handle<StringTable> string_table = isolate->factory()->string_table();
TwoCharHashTableKey key(c1, c2, isolate->heap()->HashSeed());
int entry = string_table->FindEntry(&key);
if (entry == kNotFound) {
return MaybeHandle<String>();
} else {
Handle<String> result(String::cast(string_table->KeyAt(entry)), isolate);
DCHECK(StringShape(*result).IsInternalized());
return result;
}
}
void StringTable::EnsureCapacityForDeserialization(Isolate* isolate,
int expected) {
Handle<StringTable> table = isolate->factory()->string_table();
// We need a key instance for the virtual hash function.
InternalizedStringKey dummy_key(isolate->factory()->empty_string());
table = StringTable::EnsureCapacity(table, expected, &dummy_key);
isolate->heap()->SetRootStringTable(*table);
}
namespace {
template <class StringClass>
void MigrateExternalStringResource(Isolate* isolate, Handle<String> from,
Handle<String> to) {
Handle<StringClass> cast_from = Handle<StringClass>::cast(from);
Handle<StringClass> cast_to = Handle<StringClass>::cast(to);
const typename StringClass::Resource* to_resource = cast_to->resource();
if (to_resource == nullptr) {
// |to| is a just-created internalized copy of |from|. Migrate the resource.
cast_to->set_resource(cast_from->resource());
// Zap |from|'s resource pointer to reflect the fact that |from| has
// relinquished ownership of its resource.
cast_from->set_resource(nullptr);
} else if (to_resource != cast_from->resource()) {
// |to| already existed and has its own resource. Finalize |from|.
isolate->heap()->FinalizeExternalString(*from);
}
}
} // namespace
Handle<String> StringTable::LookupString(Isolate* isolate,
Handle<String> string) {
if (string->IsThinString()) {
DCHECK(Handle<ThinString>::cast(string)->actual()->IsInternalizedString());
return handle(Handle<ThinString>::cast(string)->actual(), isolate);
}
if (string->IsConsString() && string->IsFlat()) {
string = handle(Handle<ConsString>::cast(string)->first(), isolate);
if (string->IsInternalizedString()) return string;
}
InternalizedStringKey key(string);
Handle<String> result = LookupKey(isolate, &key);
if (FLAG_thin_strings) {
if (string->IsExternalString()) {
if (result->IsExternalOneByteString()) {
MigrateExternalStringResource<ExternalOneByteString>(isolate, string,
result);
} else if (result->IsExternalTwoByteString()) {
MigrateExternalStringResource<ExternalTwoByteString>(isolate, string,
result);
} else {
// If the external string is duped into an existing non-external
// internalized string, free its resource (it's about to be rewritten
// into a ThinString below).
isolate->heap()->FinalizeExternalString(*string);
}
}
// The LookupKey() call above tries to internalize the string in-place.
// In cases where that wasn't possible (e.g. new-space strings), turn them
// into ThinStrings referring to their internalized versions now.
if (!string->IsInternalizedString()) {
DisallowHeapAllocation no_gc;
bool one_byte = result->IsOneByteRepresentation();
Handle<Map> map = one_byte
? isolate->factory()->thin_one_byte_string_map()
: isolate->factory()->thin_string_map();
int old_size = string->Size();
DCHECK(old_size >= ThinString::kSize);
string->synchronized_set_map(*map);
Handle<ThinString> thin = Handle<ThinString>::cast(string);
thin->set_actual(*result);
Address thin_end = thin->address() + ThinString::kSize;
int size_delta = old_size - ThinString::kSize;
if (size_delta != 0) {
Heap* heap = isolate->heap();
heap->CreateFillerObjectAt(thin_end, size_delta,
ClearRecordedSlots::kNo);
heap->AdjustLiveBytes(*thin, -size_delta);
}
}
} else { // !FLAG_thin_strings
if (string->IsConsString()) {
Handle<ConsString> cons = Handle<ConsString>::cast(string);
cons->set_first(*result);
cons->set_second(isolate->heap()->empty_string());
} else if (string->IsSlicedString()) {
STATIC_ASSERT(ConsString::kSize == SlicedString::kSize);
DisallowHeapAllocation no_gc;
bool one_byte = result->IsOneByteRepresentation();
Handle<Map> map = one_byte
? isolate->factory()->cons_one_byte_string_map()
: isolate->factory()->cons_string_map();
string->set_map(*map);
Handle<ConsString> cons = Handle<ConsString>::cast(string);
cons->set_first(*result);
cons->set_second(isolate->heap()->empty_string());
}
}
return result;
}
Handle<String> StringTable::LookupKey(Isolate* isolate, HashTableKey* key) {
Handle<StringTable> table = isolate->factory()->string_table();
int entry = table->FindEntry(key);
// String already in table.
if (entry != kNotFound) {
return handle(String::cast(table->KeyAt(entry)), isolate);
}
// Adding new string. Grow table if needed.
table = StringTable::EnsureCapacity(table, 1, key);
// Create string object.
Handle<Object> string = key->AsHandle(isolate);
// There must be no attempts to internalize strings that could throw
// InvalidStringLength error.
CHECK(!string.is_null());
// Add the new string and return it along with the string table.
entry = table->FindInsertionEntry(key->Hash());
table->set(EntryToIndex(entry), *string);
table->ElementAdded();
isolate->heap()->SetRootStringTable(*table);
return Handle<String>::cast(string);
}
String* StringTable::LookupKeyIfExists(Isolate* isolate, HashTableKey* key) {
Handle<StringTable> table = isolate->factory()->string_table();
int entry = table->FindEntry(key);
if (entry != kNotFound) return String::cast(table->KeyAt(entry));
return NULL;
}
Handle<StringSet> StringSet::New(Isolate* isolate) {
return HashTable::New(isolate, 0);
}
Handle<StringSet> StringSet::Add(Handle<StringSet> stringset,
Handle<String> name) {
if (!stringset->Has(name)) {
stringset = EnsureCapacity(stringset, 1, *name);
uint32_t hash = StringSetShape::Hash(*name);
int entry = stringset->FindInsertionEntry(hash);
stringset->set(EntryToIndex(entry), *name);
stringset->ElementAdded();
}
return stringset;
}
bool StringSet::Has(Handle<String> name) {
return FindEntry(*name) != kNotFound;
}
Handle<ObjectHashSet> ObjectHashSet::Add(Handle<ObjectHashSet> set,
Handle<Object> key) {
Isolate* isolate = set->GetIsolate();
int32_t hash = Object::GetOrCreateHash(isolate, key)->value();
if (!set->Has(isolate, key, hash)) {
set = EnsureCapacity(set, 1, key);
int entry = set->FindInsertionEntry(hash);
set->set(EntryToIndex(entry), *key);
set->ElementAdded();
}
return set;
}
Handle<Object> CompilationCacheTable::Lookup(Handle<String> src,
Handle<Context> context,
LanguageMode language_mode) {
Isolate* isolate = GetIsolate();
Handle<SharedFunctionInfo> shared(context->closure()->shared());
StringSharedKey key(src, shared, language_mode, kNoSourcePosition);
int entry = FindEntry(&key);
if (entry == kNotFound) return isolate->factory()->undefined_value();
int index = EntryToIndex(entry);
if (!get(index)->IsFixedArray()) return isolate->factory()->undefined_value();
return Handle<Object>(get(index + 1), isolate);
}
namespace {
const int kLiteralEntryLength = 2;
const int kLiteralInitialLength = 2;
const int kLiteralContextOffset = 0;
const int kLiteralLiteralsOffset = 1;
int SearchLiteralsMapEntry(CompilationCacheTable* cache, int cache_entry,
Context* native_context) {
DisallowHeapAllocation no_gc;
DCHECK(native_context->IsNativeContext());
Object* obj = cache->get(cache_entry);
if (obj->IsFixedArray()) {
FixedArray* literals_map = FixedArray::cast(obj);
int length = literals_map->length();
for (int i = 0; i < length; i += kLiteralEntryLength) {
if (WeakCell::cast(literals_map->get(i + kLiteralContextOffset))
->value() == native_context) {
return i;
}
}
}
return -1;
}
void AddToLiteralsMap(Handle<CompilationCacheTable> cache, int cache_entry,
Handle<Context> native_context, Handle<Cell> literals) {
Isolate* isolate = native_context->GetIsolate();
DCHECK(native_context->IsNativeContext());
STATIC_ASSERT(kLiteralEntryLength == 2);
Handle<FixedArray> new_literals_map;
int entry;
Object* obj = cache->get(cache_entry);
if (!obj->IsFixedArray() || FixedArray::cast(obj)->length() == 0) {
new_literals_map =
isolate->factory()->NewFixedArray(kLiteralInitialLength, TENURED);
entry = 0;
} else {
Handle<FixedArray> old_literals_map(FixedArray::cast(obj), isolate);
entry = SearchLiteralsMapEntry(*cache, cache_entry, *native_context);
if (entry >= 0) {
// Just set the code of the entry.
Handle<WeakCell> literals_cell =
isolate->factory()->NewWeakCell(literals);
old_literals_map->set(entry + kLiteralLiteralsOffset, *literals_cell);
return;
}
// Can we reuse an entry?
DCHECK(entry < 0);
int length = old_literals_map->length();
for (int i = 0; i < length; i += kLiteralEntryLength) {
if (WeakCell::cast(old_literals_map->get(i + kLiteralContextOffset))
->cleared()) {
new_literals_map = old_literals_map;
entry = i;
break;
}
}
if (entry < 0) {
// Copy old optimized code map and append one new entry.
new_literals_map = isolate->factory()->CopyFixedArrayAndGrow(
old_literals_map, kLiteralEntryLength, TENURED);
entry = old_literals_map->length();
}
}
Handle<WeakCell> literals_cell = isolate->factory()->NewWeakCell(literals);
WeakCell* context_cell = native_context->self_weak_cell();
new_literals_map->set(entry + kLiteralContextOffset, context_cell);
new_literals_map->set(entry + kLiteralLiteralsOffset, *literals_cell);
#ifdef DEBUG
for (int i = 0; i < new_literals_map->length(); i += kLiteralEntryLength) {
WeakCell* cell =
WeakCell::cast(new_literals_map->get(i + kLiteralContextOffset));
DCHECK(cell->cleared() || cell->value()->IsNativeContext());
cell = WeakCell::cast(new_literals_map->get(i + kLiteralLiteralsOffset));
DCHECK(cell->cleared() || (cell->value()->IsCell()));
}
#endif
Object* old_literals_map = cache->get(cache_entry);
if (old_literals_map != *new_literals_map) {
cache->set(cache_entry, *new_literals_map);
}
}
Cell* SearchLiteralsMap(CompilationCacheTable* cache, int cache_entry,
Context* native_context) {
Cell* result = nullptr;
int entry = SearchLiteralsMapEntry(cache, cache_entry, native_context);
if (entry >= 0) {
FixedArray* literals_map = FixedArray::cast(cache->get(cache_entry));
DCHECK_LE(entry + kLiteralEntryLength, literals_map->length());
WeakCell* cell =
WeakCell::cast(literals_map->get(entry + kLiteralLiteralsOffset));
result = cell->cleared() ? nullptr : Cell::cast(cell->value());
}
DCHECK(result == nullptr || result->IsCell());
return result;
}
} // namespace
InfoVectorPair CompilationCacheTable::LookupScript(Handle<String> src,
Handle<Context> context,
LanguageMode language_mode) {
InfoVectorPair empty_result;
Handle<SharedFunctionInfo> shared(context->closure()->shared());
StringSharedKey key(src, shared, language_mode, kNoSourcePosition);
int entry = FindEntry(&key);
if (entry == kNotFound) return empty_result;
int index = EntryToIndex(entry);
if (!get(index)->IsFixedArray()) return empty_result;
Object* obj = get(index + 1);
if (obj->IsSharedFunctionInfo()) {
Cell* literals =
SearchLiteralsMap(this, index + 2, context->native_context());
return InfoVectorPair(SharedFunctionInfo::cast(obj), literals);
}
return empty_result;
}
InfoVectorPair CompilationCacheTable::LookupEval(
Handle<String> src, Handle<SharedFunctionInfo> outer_info,
Handle<Context> native_context, LanguageMode language_mode, int position) {
InfoVectorPair empty_result;
StringSharedKey key(src, outer_info, language_mode, position);
int entry = FindEntry(&key);
if (entry == kNotFound) return empty_result;
int index = EntryToIndex(entry);
if (!get(index)->IsFixedArray()) return empty_result;
Object* obj = get(EntryToIndex(entry) + 1);
if (obj->IsSharedFunctionInfo()) {
Cell* literals =
SearchLiteralsMap(this, EntryToIndex(entry) + 2, *native_context);
return InfoVectorPair(SharedFunctionInfo::cast(obj), literals);
}
return empty_result;
}
Handle<Object> CompilationCacheTable::LookupRegExp(Handle<String> src,
JSRegExp::Flags flags) {
Isolate* isolate = GetIsolate();
DisallowHeapAllocation no_allocation;
RegExpKey key(src, flags);
int entry = FindEntry(&key);
if (entry == kNotFound) return isolate->factory()->undefined_value();
return Handle<Object>(get(EntryToIndex(entry) + 1), isolate);
}
Handle<CompilationCacheTable> CompilationCacheTable::Put(
Handle<CompilationCacheTable> cache, Handle<String> src,
Handle<Context> context, LanguageMode language_mode, Handle<Object> value) {
Isolate* isolate = cache->GetIsolate();
Handle<SharedFunctionInfo> shared(context->closure()->shared());
StringSharedKey key(src, shared, language_mode, kNoSourcePosition);
Handle<Object> k = key.AsHandle(isolate);
cache = EnsureCapacity(cache, 1, &key);
int entry = cache->FindInsertionEntry(key.Hash());
cache->set(EntryToIndex(entry), *k);
cache->set(EntryToIndex(entry) + 1, *value);
cache->ElementAdded();
return cache;
}
Handle<CompilationCacheTable> CompilationCacheTable::PutScript(
Handle<CompilationCacheTable> cache, Handle<String> src,
Handle<Context> context, LanguageMode language_mode,
Handle<SharedFunctionInfo> value, Handle<Cell> literals) {
Isolate* isolate = cache->GetIsolate();
Handle<SharedFunctionInfo> shared(context->closure()->shared());
Handle<Context> native_context(context->native_context());
StringSharedKey key(src, shared, language_mode, kNoSourcePosition);
Handle<Object> k = key.AsHandle(isolate);
cache = EnsureCapacity(cache, 1, &key);
int entry = cache->FindInsertionEntry(key.Hash());
cache->set(EntryToIndex(entry), *k);
cache->set(EntryToIndex(entry) + 1, *value);
AddToLiteralsMap(cache, EntryToIndex(entry) + 2, native_context, literals);
cache->ElementAdded();
return cache;
}
Handle<CompilationCacheTable> CompilationCacheTable::PutEval(
Handle<CompilationCacheTable> cache, Handle<String> src,
Handle<SharedFunctionInfo> outer_info, Handle<SharedFunctionInfo> value,
Handle<Context> native_context, Handle<Cell> literals, int position) {
Isolate* isolate = cache->GetIsolate();
StringSharedKey key(src, outer_info, value->language_mode(), position);
{
Handle<Object> k = key.AsHandle(isolate);
int entry = cache->FindEntry(&key);
if (entry != kNotFound) {
cache->set(EntryToIndex(entry), *k);
cache->set(EntryToIndex(entry) + 1, *value);
// AddToLiteralsMap may allocate a new sub-array to live in the entry,
// but it won't change the cache array. Therefore EntryToIndex and
// entry remains correct.
AddToLiteralsMap(cache, EntryToIndex(entry) + 2, native_context,
literals);
return cache;
}
}
cache = EnsureCapacity(cache, 1, &key);
int entry = cache->FindInsertionEntry(key.Hash());
Handle<Object> k =
isolate->factory()->NewNumber(static_cast<double>(key.Hash()));
cache->set(EntryToIndex(entry), *k);
cache->set(EntryToIndex(entry) + 1, Smi::FromInt(kHashGenerations));
cache->ElementAdded();
return cache;
}
Handle<CompilationCacheTable> CompilationCacheTable::PutRegExp(
Handle<CompilationCacheTable> cache, Handle<String> src,
JSRegExp::Flags flags, Handle<FixedArray> value) {
RegExpKey key(src, flags);
cache = EnsureCapacity(cache, 1, &key);
int entry = cache->FindInsertionEntry(key.Hash());
// We store the value in the key slot, and compare the search key
// to the stored value with a custon IsMatch function during lookups.
cache->set(EntryToIndex(entry), *value);
cache->set(EntryToIndex(entry) + 1, *value);
cache->ElementAdded();
return cache;
}
void CompilationCacheTable::Age() {
DisallowHeapAllocation no_allocation;
Object* the_hole_value = GetHeap()->the_hole_value();
for (int entry = 0, size = Capacity(); entry < size; entry++) {
int entry_index = EntryToIndex(entry);
int value_index = entry_index + 1;
if (get(entry_index)->IsNumber()) {
Smi* count = Smi::cast(get(value_index));
count = Smi::FromInt(count->value() - 1);
if (count->value() == 0) {
NoWriteBarrierSet(this, entry_index, the_hole_value);
NoWriteBarrierSet(this, value_index, the_hole_value);
ElementRemoved();
} else {
NoWriteBarrierSet(this, value_index, count);
}
} else if (get(entry_index)->IsFixedArray()) {
SharedFunctionInfo* info = SharedFunctionInfo::cast(get(value_index));
bool is_old =
info->IsInterpreted()
? info->bytecode_array()->IsOld()
: info->code()->kind() != Code::FUNCTION || info->code()->IsOld();
if (is_old) {
for (int i = 0; i < kEntrySize; i++) {
NoWriteBarrierSet(this, entry_index + i, the_hole_value);
}
ElementRemoved();
}
}
}
}
void CompilationCacheTable::Remove(Object* value) {
DisallowHeapAllocation no_allocation;
Object* the_hole_value = GetHeap()->the_hole_value();
for (int entry = 0, size = Capacity(); entry < size; entry++) {
int entry_index = EntryToIndex(entry);
int value_index = entry_index + 1;
if (get(value_index) == value) {
for (int i = 0; i < kEntrySize; i++) {
NoWriteBarrierSet(this, entry_index + i, the_hole_value);
}
ElementRemoved();
}
}
return;
}
template <typename Derived, typename Shape, typename Key>
Handle<Derived> Dictionary<Derived, Shape, Key>::New(
Isolate* isolate, int at_least_space_for, PretenureFlag pretenure,
MinimumCapacity capacity_option) {
DCHECK(0 <= at_least_space_for);
Handle<Derived> dict = DerivedHashTable::New(isolate, at_least_space_for,
capacity_option, pretenure);
// Initialize the next enumeration index.
dict->SetNextEnumerationIndex(PropertyDetails::kInitialIndex);
return dict;
}
template <typename Derived, typename Shape, typename Key>
Handle<Derived> Dictionary<Derived, Shape, Key>::NewEmpty(
Isolate* isolate, PretenureFlag pretenure) {
Handle<Derived> dict = DerivedHashTable::New(isolate, 1, pretenure);
// Attempt to add one element to the empty dictionary must cause reallocation.
DCHECK(!dict->HasSufficientCapacityToAdd(1));
// Initialize the next enumeration index.
dict->SetNextEnumerationIndex(PropertyDetails::kInitialIndex);
return dict;
}
template <typename Derived, typename Shape, typename Key>
Handle<FixedArray>
Dictionary<Derived, Shape, Key>::GenerateNewEnumerationIndices(
Handle<Derived> dictionary) {
int length = dictionary->NumberOfElements();
Handle<FixedArray> iteration_order = IterationIndices(dictionary);
DCHECK(iteration_order->length() == length);
// Iterate over the dictionary using the enumeration order and update
// the dictionary with new enumeration indices.
for (int i = 0; i < length; i++) {
int index = Smi::cast(iteration_order->get(i))->value();
DCHECK(dictionary->IsKey(dictionary->KeyAt(index)));
int enum_index = PropertyDetails::kInitialIndex + i;
PropertyDetails details = dictionary->DetailsAt(index);
PropertyDetails new_details = details.set_index(enum_index);
dictionary->DetailsAtPut(index, new_details);
}
// Set the next enumeration index.
dictionary->SetNextEnumerationIndex(PropertyDetails::kInitialIndex+length);
return iteration_order;
}
template <typename Derived, typename Shape, typename Key>
void Dictionary<Derived, Shape, Key>::SetRequiresCopyOnCapacityChange() {
DCHECK_EQ(0, DerivedHashTable::NumberOfElements());
DCHECK_EQ(0, DerivedHashTable::NumberOfDeletedElements());
// Make sure that HashTable::EnsureCapacity will create a copy.
DerivedHashTable::SetNumberOfDeletedElements(DerivedHashTable::Capacity());
DCHECK(!DerivedHashTable::HasSufficientCapacityToAdd(1));
}
template <typename Derived, typename Shape, typename Key>
Handle<Derived> Dictionary<Derived, Shape, Key>::EnsureCapacity(
Handle<Derived> dictionary, int n, Key key) {
// Check whether there are enough enumeration indices to add n elements.
if (Shape::kIsEnumerable &&
!PropertyDetails::IsValidIndex(dictionary->NextEnumerationIndex() + n)) {
// If not, we generate new indices for the properties.
GenerateNewEnumerationIndices(dictionary);
}
return DerivedHashTable::EnsureCapacity(dictionary, n, key);
}
template <typename Derived, typename Shape, typename Key>
Handle<Object> Dictionary<Derived, Shape, Key>::DeleteProperty(
Handle<Derived> dictionary, int entry) {
Factory* factory = dictionary->GetIsolate()->factory();
PropertyDetails details = dictionary->DetailsAt(entry);
if (!details.IsConfigurable()) return factory->false_value();
dictionary->SetEntry(
entry, factory->the_hole_value(), factory->the_hole_value());
dictionary->ElementRemoved();
return factory->true_value();
}
template<typename Derived, typename Shape, typename Key>
Handle<Derived> Dictionary<Derived, Shape, Key>::AtPut(
Handle<Derived> dictionary, Key key, Handle<Object> value) {
int entry = dictionary->FindEntry(key);
// If the entry is present set the value;
if (entry != Dictionary::kNotFound) {
dictionary->ValueAtPut(entry, *value);
return dictionary;
}
// Check whether the dictionary should be extended.
dictionary = EnsureCapacity(dictionary, 1, key);
#ifdef DEBUG
USE(Shape::AsHandle(dictionary->GetIsolate(), key));
#endif
PropertyDetails details = PropertyDetails::Empty();
AddEntry(dictionary, key, value, details, dictionary->Hash(key));
return dictionary;
}
template <typename Derived, typename Shape, typename Key>
Handle<Derived> Dictionary<Derived, Shape, Key>::Add(Handle<Derived> dictionary,
Key key,
Handle<Object> value,
PropertyDetails details,
int* entry_out) {
// Valdate key is absent.
SLOW_DCHECK((dictionary->FindEntry(key) == Dictionary::kNotFound));
// Check whether the dictionary should be extended.
dictionary = EnsureCapacity(dictionary, 1, key);
int entry = AddEntry(dictionary, key, value, details, dictionary->Hash(key));
if (entry_out) *entry_out = entry;
return dictionary;
}
// Add a key, value pair to the dictionary. Returns entry value.
template <typename Derived, typename Shape, typename Key>
int Dictionary<Derived, Shape, Key>::AddEntry(Handle<Derived> dictionary,
Key key, Handle<Object> value,
PropertyDetails details,
uint32_t hash) {
// Compute the key object.
Handle<Object> k = Shape::AsHandle(dictionary->GetIsolate(), key);
uint32_t entry = dictionary->FindInsertionEntry(hash);
// Insert element at empty or deleted entry
if (details.dictionary_index() == 0 && Shape::kIsEnumerable) {
// Assign an enumeration index to the property and update
// SetNextEnumerationIndex.
int index = dictionary->NextEnumerationIndex();
details = details.set_index(index);
dictionary->SetNextEnumerationIndex(index + 1);
}
dictionary->SetEntry(entry, k, value, details);
DCHECK((dictionary->KeyAt(entry)->IsNumber() ||
dictionary->KeyAt(entry)->IsName()));
dictionary->ElementAdded();
return entry;
}
bool SeededNumberDictionary::HasComplexElements() {
if (!requires_slow_elements()) return false;
Isolate* isolate = this->GetIsolate();
int capacity = this->Capacity();
for (int i = 0; i < capacity; i++) {
Object* k = this->KeyAt(i);
if (!this->IsKey(isolate, k)) continue;
DCHECK(!IsDeleted(i));
PropertyDetails details = this->DetailsAt(i);
if (details.kind() == kAccessor) return true;
PropertyAttributes attr = details.attributes();
if (attr & ALL_ATTRIBUTES_MASK) return true;
}
return false;
}
void SeededNumberDictionary::UpdateMaxNumberKey(
uint32_t key, Handle<JSObject> dictionary_holder) {
DisallowHeapAllocation no_allocation;
// If the dictionary requires slow elements an element has already
// been added at a high index.
if (requires_slow_elements()) return;
// Check if this index is high enough that we should require slow
// elements.
if (key > kRequiresSlowElementsLimit) {
if (!dictionary_holder.is_null()) {
dictionary_holder->RequireSlowElements(this);
}
set_requires_slow_elements();
return;
}
// Update max key value.
Object* max_index_object = get(kMaxNumberKeyIndex);
if (!max_index_object->IsSmi() || max_number_key() < key) {
FixedArray::set(kMaxNumberKeyIndex,
Smi::FromInt(key << kRequiresSlowElementsTagSize));
}
}
Handle<SeededNumberDictionary> SeededNumberDictionary::AddNumberEntry(
Handle<SeededNumberDictionary> dictionary, uint32_t key,
Handle<Object> value, PropertyDetails details,
Handle<JSObject> dictionary_holder) {
dictionary->UpdateMaxNumberKey(key, dictionary_holder);
SLOW_DCHECK(dictionary->FindEntry(key) == kNotFound);
return Add(dictionary, key, value, details);
}
Handle<UnseededNumberDictionary> UnseededNumberDictionary::AddNumberEntry(
Handle<UnseededNumberDictionary> dictionary,
uint32_t key,
Handle<Object> value) {
SLOW_DCHECK(dictionary->FindEntry(key) == kNotFound);
return Add(dictionary, key, value, PropertyDetails::Empty());
}
Handle<UnseededNumberDictionary> UnseededNumberDictionary::DeleteKey(
Handle<UnseededNumberDictionary> dictionary, uint32_t key) {
int entry = dictionary->FindEntry(key);
if (entry == kNotFound) return dictionary;
Factory* factory = dictionary->GetIsolate()->factory();
dictionary->SetEntry(entry, factory->the_hole_value(),
factory->the_hole_value());
dictionary->ElementRemoved();
return dictionary->Shrink(dictionary, key);
}
Handle<SeededNumberDictionary> SeededNumberDictionary::AtNumberPut(
Handle<SeededNumberDictionary> dictionary, uint32_t key,
Handle<Object> value, Handle<JSObject> dictionary_holder) {
dictionary->UpdateMaxNumberKey(key, dictionary_holder);
return AtPut(dictionary, key, value);
}
Handle<UnseededNumberDictionary> UnseededNumberDictionary::AtNumberPut(
Handle<UnseededNumberDictionary> dictionary,
uint32_t key,
Handle<Object> value) {
return AtPut(dictionary, key, value);
}
Handle<SeededNumberDictionary> SeededNumberDictionary::Set(
Handle<SeededNumberDictionary> dictionary, uint32_t key,
Handle<Object> value, PropertyDetails details,
Handle<JSObject> dictionary_holder) {
int entry = dictionary->FindEntry(key);
if (entry == kNotFound) {
return AddNumberEntry(dictionary, key, value, details, dictionary_holder);
}
// Preserve enumeration index.
details = details.set_index(dictionary->DetailsAt(entry).dictionary_index());
Handle<Object> object_key =
SeededNumberDictionaryShape::AsHandle(dictionary->GetIsolate(), key);
dictionary->SetEntry(entry, object_key, value, details);
return dictionary;
}
Handle<UnseededNumberDictionary> UnseededNumberDictionary::Set(
Handle<UnseededNumberDictionary> dictionary,
uint32_t key,
Handle<Object> value) {
int entry = dictionary->FindEntry(key);
if (entry == kNotFound) return AddNumberEntry(dictionary, key, value);
Handle<Object> object_key =
UnseededNumberDictionaryShape::AsHandle(dictionary->GetIsolate(), key);
dictionary->SetEntry(entry, object_key, value);
return dictionary;
}
template <typename Derived, typename Shape, typename Key>
int Dictionary<Derived, Shape, Key>::NumberOfElementsFilterAttributes(
PropertyFilter filter) {
Isolate* isolate = this->GetIsolate();
int capacity = this->Capacity();
int result = 0;
for (int i = 0; i < capacity; i++) {
Object* k = this->KeyAt(i);
if (this->IsKey(isolate, k) && !k->FilterKey(filter)) {
if (this->IsDeleted(i)) continue;
PropertyDetails details = this->DetailsAt(i);
PropertyAttributes attr = details.attributes();
if ((attr & filter) == 0) result++;
}
}
return result;
}
template <typename Dictionary>
struct EnumIndexComparator {
explicit EnumIndexComparator(Dictionary* dict) : dict(dict) {}
bool operator() (Smi* a, Smi* b) {
PropertyDetails da(dict->DetailsAt(a->value()));
PropertyDetails db(dict->DetailsAt(b->value()));
return da.dictionary_index() < db.dictionary_index();
}
Dictionary* dict;
};
template <typename Derived, typename Shape, typename Key>
void Dictionary<Derived, Shape, Key>::CopyEnumKeysTo(
Handle<Dictionary<Derived, Shape, Key>> dictionary,
Handle<FixedArray> storage, KeyCollectionMode mode,
KeyAccumulator* accumulator) {
DCHECK_IMPLIES(mode != KeyCollectionMode::kOwnOnly, accumulator != nullptr);
Isolate* isolate = dictionary->GetIsolate();
int length = storage->length();
int capacity = dictionary->Capacity();
int properties = 0;
for (int i = 0; i < capacity; i++) {
Object* key = dictionary->KeyAt(i);
bool is_shadowing_key = false;
if (!dictionary->IsKey(isolate, key)) continue;
if (key->IsSymbol()) continue;
PropertyDetails details = dictionary->DetailsAt(i);
if (details.IsDontEnum()) {
if (mode == KeyCollectionMode::kIncludePrototypes) {
is_shadowing_key = true;
} else {
continue;
}
}
if (dictionary->IsDeleted(i)) continue;
if (is_shadowing_key) {
accumulator->AddShadowingKey(key);
continue;
} else {
storage->set(properties, Smi::FromInt(i));
}
properties++;
if (mode == KeyCollectionMode::kOwnOnly && properties == length) break;
}
CHECK_EQ(length, properties);
DisallowHeapAllocation no_gc;
Dictionary<Derived, Shape, Key>* raw_dictionary = *dictionary;
FixedArray* raw_storage = *storage;
EnumIndexComparator<Derived> cmp(static_cast<Derived*>(*dictionary));
Smi** start = reinterpret_cast<Smi**>(storage->GetFirstElementAddress());
std::sort(start, start + length, cmp);
for (int i = 0; i < length; i++) {
int index = Smi::cast(raw_storage->get(i))->value();
raw_storage->set(i, raw_dictionary->KeyAt(index));
}
}
template <typename Derived, typename Shape, typename Key>
Handle<FixedArray> Dictionary<Derived, Shape, Key>::IterationIndices(
Handle<Dictionary<Derived, Shape, Key>> dictionary) {
Isolate* isolate = dictionary->GetIsolate();
int capacity = dictionary->Capacity();
int length = dictionary->NumberOfElements();
Handle<FixedArray> array = isolate->factory()->NewFixedArray(length);
int array_size = 0;
{
DisallowHeapAllocation no_gc;
Dictionary<Derived, Shape, Key>* raw_dict = *dictionary;
for (int i = 0; i < capacity; i++) {
Object* k = raw_dict->KeyAt(i);
if (!raw_dict->IsKey(isolate, k)) continue;
if (raw_dict->IsDeleted(i)) continue;
array->set(array_size++, Smi::FromInt(i));
}
DCHECK_EQ(array_size, length);
EnumIndexComparator<Derived> cmp(static_cast<Derived*>(raw_dict));
Smi** start = reinterpret_cast<Smi**>(array->GetFirstElementAddress());
std::sort(start, start + array_size, cmp);
}
array->Shrink(array_size);
return array;
}
template <typename Derived, typename Shape, typename Key>
void Dictionary<Derived, Shape, Key>::CollectKeysTo(
Handle<Dictionary<Derived, Shape, Key>> dictionary, KeyAccumulator* keys) {
Isolate* isolate = keys->isolate();
int capacity = dictionary->Capacity();
Handle<FixedArray> array =
isolate->factory()->NewFixedArray(dictionary->NumberOfElements());
int array_size = 0;
PropertyFilter filter = keys->filter();
{
DisallowHeapAllocation no_gc;
Dictionary<Derived, Shape, Key>* raw_dict = *dictionary;
for (int i = 0; i < capacity; i++) {
Object* k = raw_dict->KeyAt(i);
if (!raw_dict->IsKey(isolate, k) || k->FilterKey(filter)) continue;
if (raw_dict->IsDeleted(i)) continue;
PropertyDetails details = raw_dict->DetailsAt(i);
if ((details.attributes() & filter) != 0) {
keys->AddShadowingKey(k);
continue;
}
if (filter & ONLY_ALL_CAN_READ) {
if (details.kind() != kAccessor) continue;
Object* accessors = raw_dict->ValueAt(i);
if (accessors->IsPropertyCell()) {
accessors = PropertyCell::cast(accessors)->value();
}
if (!accessors->IsAccessorInfo()) continue;
if (!AccessorInfo::cast(accessors)->all_can_read()) continue;
}
array->set(array_size++, Smi::FromInt(i));
}
EnumIndexComparator<Derived> cmp(static_cast<Derived*>(raw_dict));
Smi** start = reinterpret_cast<Smi**>(array->GetFirstElementAddress());
std::sort(start, start + array_size, cmp);
}
bool has_seen_symbol = false;
for (int i = 0; i < array_size; i++) {
int index = Smi::cast(array->get(i))->value();
Object* key = dictionary->KeyAt(index);
if (key->IsSymbol()) {
has_seen_symbol = true;
continue;
}
keys->AddKey(key, DO_NOT_CONVERT);
}
if (has_seen_symbol) {
for (int i = 0; i < array_size; i++) {
int index = Smi::cast(array->get(i))->value();
Object* key = dictionary->KeyAt(index);
if (!key->IsSymbol()) continue;
keys->AddKey(key, DO_NOT_CONVERT);
}
}
}
// Backwards lookup (slow).
template<typename Derived, typename Shape, typename Key>
Object* Dictionary<Derived, Shape, Key>::SlowReverseLookup(Object* value) {
Isolate* isolate = this->GetIsolate();
int capacity = this->Capacity();
for (int i = 0; i < capacity; i++) {
Object* k = this->KeyAt(i);
if (!this->IsKey(isolate, k)) continue;
Object* e = this->ValueAt(i);
// TODO(dcarney): this should be templatized.
if (e->IsPropertyCell()) {
e = PropertyCell::cast(e)->value();
}
if (e == value) return k;
}
return isolate->heap()->undefined_value();
}
Object* ObjectHashTable::Lookup(Isolate* isolate, Handle<Object> key,
int32_t hash) {
DisallowHeapAllocation no_gc;
DCHECK(IsKey(isolate, *key));
int entry = FindEntry(isolate, key, hash);
if (entry == kNotFound) return isolate->heap()->the_hole_value();
return get(EntryToIndex(entry) + 1);
}
Object* ObjectHashTable::Lookup(Handle<Object> key) {
DisallowHeapAllocation no_gc;
Isolate* isolate = GetIsolate();
DCHECK(IsKey(isolate, *key));
// If the object does not have an identity hash, it was never used as a key.
Object* hash = key->GetHash();
if (hash->IsUndefined(isolate)) {
return isolate->heap()->the_hole_value();
}
return Lookup(isolate, key, Smi::cast(hash)->value());
}
Object* ObjectHashTable::ValueAt(int entry) {
return get(EntryToValueIndex(entry));
}
Object* ObjectHashTable::Lookup(Handle<Object> key, int32_t hash) {
return Lookup(GetIsolate(), key, hash);
}
Handle<ObjectHashTable> ObjectHashTable::Put(Handle<ObjectHashTable> table,
Handle<Object> key,
Handle<Object> value) {
Isolate* isolate = table->GetIsolate();
DCHECK(table->IsKey(isolate, *key));
DCHECK(!value->IsTheHole(isolate));
// Make sure the key object has an identity hash code.
int32_t hash = Object::GetOrCreateHash(isolate, key)->value();
return Put(table, key, value, hash);
}
Handle<ObjectHashTable> ObjectHashTable::Put(Handle<ObjectHashTable> table,
Handle<Object> key,
Handle<Object> value,
int32_t hash) {
Isolate* isolate = table->GetIsolate();
DCHECK(table->IsKey(isolate, *key));
DCHECK(!value->IsTheHole(isolate));
int entry = table->FindEntry(isolate, key, hash);
// Key is already in table, just overwrite value.
if (entry != kNotFound) {
table->set(EntryToIndex(entry) + 1, *value);
return table;
}
// Rehash if more than 33% of the entries are deleted entries.
// TODO(jochen): Consider to shrink the fixed array in place.
if ((table->NumberOfDeletedElements() << 1) > table->NumberOfElements()) {
table->Rehash(isolate->factory()->undefined_value());
}
// If we're out of luck, we didn't get a GC recently, and so rehashing
// isn't enough to avoid a crash.
if (!table->HasSufficientCapacityToAdd(1)) {
int nof = table->NumberOfElements() + 1;
int capacity = ObjectHashTable::ComputeCapacity(nof * 2);
if (capacity > ObjectHashTable::kMaxCapacity) {
for (size_t i = 0; i < 2; ++i) {
isolate->heap()->CollectAllGarbage(
Heap::kFinalizeIncrementalMarkingMask,
GarbageCollectionReason::kFullHashtable);
}
table->Rehash(isolate->factory()->undefined_value());
}
}
// Check whether the hash table should be extended.
table = EnsureCapacity(table, 1, key);
table->AddEntry(table->FindInsertionEntry(hash), *key, *value);
return table;
}
Handle<ObjectHashTable> ObjectHashTable::Remove(Handle<ObjectHashTable> table,
Handle<Object> key,
bool* was_present) {
DCHECK(table->IsKey(table->GetIsolate(), *key));
Object* hash = key->GetHash();
if (hash->IsUndefined(table->GetIsolate())) {
*was_present = false;
return table;
}
return Remove(table, key, was_present, Smi::cast(hash)->value());
}
Handle<ObjectHashTable> ObjectHashTable::Remove(Handle<ObjectHashTable> table,
Handle<Object> key,
bool* was_present,
int32_t hash) {
Isolate* isolate = table->GetIsolate();
DCHECK(table->IsKey(isolate, *key));
int entry = table->FindEntry(isolate, key, hash);
if (entry == kNotFound) {
*was_present = false;
return table;
}
*was_present = true;
table->RemoveEntry(entry);
return Shrink(table, key);
}
void ObjectHashTable::AddEntry(int entry, Object* key, Object* value) {
set(EntryToIndex(entry), key);
set(EntryToIndex(entry) + 1, value);
ElementAdded();
}
void ObjectHashTable::RemoveEntry(int entry) {
set_the_hole(EntryToIndex(entry));
set_the_hole(EntryToIndex(entry) + 1);
ElementRemoved();
}
Object* WeakHashTable::Lookup(Handle<HeapObject> key) {
DisallowHeapAllocation no_gc;
Isolate* isolate = GetIsolate();
DCHECK(IsKey(isolate, *key));
int entry = FindEntry(key);
if (entry == kNotFound) return isolate->heap()->the_hole_value();
return get(EntryToValueIndex(entry));
}
Handle<WeakHashTable> WeakHashTable::Put(Handle<WeakHashTable> table,
Handle<HeapObject> key,
Handle<HeapObject> value) {
Isolate* isolate = key->GetIsolate();
DCHECK(table->IsKey(isolate, *key));
int entry = table->FindEntry(key);
// Key is already in table, just overwrite value.
if (entry != kNotFound) {
table->set(EntryToValueIndex(entry), *value);
return table;
}
Handle<WeakCell> key_cell = isolate->factory()->NewWeakCell(key);
// Check whether the hash table should be extended.
table = EnsureCapacity(table, 1, key, TENURED);
table->AddEntry(table->FindInsertionEntry(table->Hash(key)), key_cell, value);
return table;
}
void WeakHashTable::AddEntry(int entry, Handle<WeakCell> key_cell,
Handle<HeapObject> value) {
DisallowHeapAllocation no_allocation;
set(EntryToIndex(entry), *key_cell);
set(EntryToValueIndex(entry), *value);
ElementAdded();
}
template<class Derived, class Iterator, int entrysize>
Handle<Derived> OrderedHashTable<Derived, Iterator, entrysize>::Allocate(
Isolate* isolate, int capacity, PretenureFlag pretenure) {
// Capacity must be a power of two, since we depend on being able
// to divide and multiple by 2 (kLoadFactor) to derive capacity
// from number of buckets. If we decide to change kLoadFactor
// to something other than 2, capacity should be stored as another
// field of this object.
capacity = base::bits::RoundUpToPowerOfTwo32(Max(kMinCapacity, capacity));
if (capacity > kMaxCapacity) {
v8::internal::Heap::FatalProcessOutOfMemory("invalid table size", true);
}
int num_buckets = capacity / kLoadFactor;
Handle<FixedArray> backing_store = isolate->factory()->NewFixedArray(
kHashTableStartIndex + num_buckets + (capacity * kEntrySize), pretenure);
backing_store->set_map_no_write_barrier(
isolate->heap()->ordered_hash_table_map());
Handle<Derived> table = Handle<Derived>::cast(backing_store);
for (int i = 0; i < num_buckets; ++i) {
table->set(kHashTableStartIndex + i, Smi::FromInt(kNotFound));
}
table->SetNumberOfBuckets(num_buckets);
table->SetNumberOfElements(0);
table->SetNumberOfDeletedElements(0);
return table;
}
template<class Derived, class Iterator, int entrysize>
Handle<Derived> OrderedHashTable<Derived, Iterator, entrysize>::EnsureGrowable(
Handle<Derived> table) {
DCHECK(!table->IsObsolete());
int nof = table->NumberOfElements();
int nod = table->NumberOfDeletedElements();
int capacity = table->Capacity();
if ((nof + nod) < capacity) return table;
// Don't need to grow if we can simply clear out deleted entries instead.
// Note that we can't compact in place, though, so we always allocate
// a new table.
return Rehash(table, (nod < (capacity >> 1)) ? capacity << 1 : capacity);
}
template<class Derived, class Iterator, int entrysize>
Handle<Derived> OrderedHashTable<Derived, Iterator, entrysize>::Shrink(
Handle<Derived> table) {
DCHECK(!table->IsObsolete());
int nof = table->NumberOfElements();
int capacity = table->Capacity();
if (nof >= (capacity >> 2)) return table;
return Rehash(table, capacity / 2);
}
template<class Derived, class Iterator, int entrysize>
Handle<Derived> OrderedHashTable<Derived, Iterator, entrysize>::Clear(
Handle<Derived> table) {
DCHECK(!table->IsObsolete());
Handle<Derived> new_table =
Allocate(table->GetIsolate(),
kMinCapacity,
table->GetHeap()->InNewSpace(*table) ? NOT_TENURED : TENURED);
table->SetNextTable(*new_table);
table->SetNumberOfDeletedElements(kClearedTableSentinel);
return new_table;
}
template <class Derived, class Iterator, int entrysize>
bool OrderedHashTable<Derived, Iterator, entrysize>::HasKey(
Handle<Derived> table, Handle<Object> key) {
DisallowHeapAllocation no_gc;
Isolate* isolate = table->GetIsolate();
Object* raw_key = *key;
int entry = table->KeyToFirstEntry(isolate, raw_key);
// Walk the chain in the bucket to find the key.
while (entry != kNotFound) {
Object* candidate_key = table->KeyAt(entry);
if (candidate_key->SameValueZero(raw_key)) return true;
entry = table->NextChainEntry(entry);
}
return false;
}
Handle<OrderedHashSet> OrderedHashSet::Add(Handle<OrderedHashSet> table,
Handle<Object> key) {
int hash = Object::GetOrCreateHash(table->GetIsolate(), key)->value();
int entry = table->HashToEntry(hash);
// Walk the chain of the bucket and try finding the key.
while (entry != kNotFound) {
Object* candidate_key = table->KeyAt(entry);
// Do not add if we have the key already
if (candidate_key->SameValueZero(*key)) return table;
entry = table->NextChainEntry(entry);
}
table = OrderedHashSet::EnsureGrowable(table);
// Read the existing bucket values.
int bucket = table->HashToBucket(hash);
int previous_entry = table->HashToEntry(hash);
int nof = table->NumberOfElements();
// Insert a new entry at the end,
int new_entry = nof + table->NumberOfDeletedElements();
int new_index = table->EntryToIndex(new_entry);
table->set(new_index, *key);
table->set(new_index + kChainOffset, Smi::FromInt(previous_entry));
// and point the bucket to the new entry.
table->set(kHashTableStartIndex + bucket, Smi::FromInt(new_entry));
table->SetNumberOfElements(nof + 1);
return table;
}
Handle<FixedArray> OrderedHashSet::ConvertToKeysArray(
Handle<OrderedHashSet> table, GetKeysConversion convert) {
Isolate* isolate = table->GetIsolate();
int length = table->NumberOfElements();
int nof_buckets = table->NumberOfBuckets();
// Convert the dictionary to a linear list.
Handle<FixedArray> result = Handle<FixedArray>::cast(table);
// From this point on table is no longer a valid OrderedHashSet.
result->set_map(isolate->heap()->fixed_array_map());
for (int i = 0; i < length; i++) {
int index = kHashTableStartIndex + nof_buckets + (i * kEntrySize);
Object* key = table->get(index);
if (convert == GetKeysConversion::kConvertToString && key->IsNumber()) {
key = *isolate->factory()->NumberToString(handle(key, isolate));
}
result->set(i, key);
}
result->Shrink(length);
return result;
}
template<class Derived, class Iterator, int entrysize>
Handle<Derived> OrderedHashTable<Derived, Iterator, entrysize>::Rehash(
Handle<Derived> table, int new_capacity) {
Isolate* isolate = table->GetIsolate();
DCHECK(!table->IsObsolete());
Handle<Derived> new_table =
Allocate(isolate, new_capacity,
isolate->heap()->InNewSpace(*table) ? NOT_TENURED : TENURED);
int nof = table->NumberOfElements();
int nod = table->NumberOfDeletedElements();
int new_buckets = new_table->NumberOfBuckets();
int new_entry = 0;
int removed_holes_index = 0;
DisallowHeapAllocation no_gc;
for (int old_entry = 0; old_entry < (nof + nod); ++old_entry) {
Object* key = table->KeyAt(old_entry);
if (key->IsTheHole(isolate)) {
table->SetRemovedIndexAt(removed_holes_index++, old_entry);
continue;
}
Object* hash = key->GetHash();
int bucket = Smi::cast(hash)->value() & (new_buckets - 1);
Object* chain_entry = new_table->get(kHashTableStartIndex + bucket);
new_table->set(kHashTableStartIndex + bucket, Smi::FromInt(new_entry));
int new_index = new_table->EntryToIndex(new_entry);
int old_index = table->EntryToIndex(old_entry);
for (int i = 0; i < entrysize; ++i) {
Object* value = table->get(old_index + i);
new_table->set(new_index + i, value);
}
new_table->set(new_index + kChainOffset, chain_entry);
++new_entry;
}
DCHECK_EQ(nod, removed_holes_index);
new_table->SetNumberOfElements(nof);
table->SetNextTable(*new_table);
return new_table;
}
template Handle<OrderedHashSet>
OrderedHashTable<OrderedHashSet, JSSetIterator, 1>::Allocate(
Isolate* isolate, int capacity, PretenureFlag pretenure);
template Handle<OrderedHashSet>
OrderedHashTable<OrderedHashSet, JSSetIterator, 1>::EnsureGrowable(
Handle<OrderedHashSet> table);
template Handle<OrderedHashSet>
OrderedHashTable<OrderedHashSet, JSSetIterator, 1>::Shrink(
Handle<OrderedHashSet> table);
template Handle<OrderedHashSet>
OrderedHashTable<OrderedHashSet, JSSetIterator, 1>::Clear(
Handle<OrderedHashSet> table);
template bool OrderedHashTable<OrderedHashSet, JSSetIterator, 1>::HasKey(
Handle<OrderedHashSet> table, Handle<Object> key);
template Handle<OrderedHashMap>
OrderedHashTable<OrderedHashMap, JSMapIterator, 2>::Allocate(
Isolate* isolate, int capacity, PretenureFlag pretenure);
template Handle<OrderedHashMap>
OrderedHashTable<OrderedHashMap, JSMapIterator, 2>::EnsureGrowable(
Handle<OrderedHashMap> table);
template Handle<OrderedHashMap>
OrderedHashTable<OrderedHashMap, JSMapIterator, 2>::Shrink(
Handle<OrderedHashMap> table);
template Handle<OrderedHashMap>
OrderedHashTable<OrderedHashMap, JSMapIterator, 2>::Clear(
Handle<OrderedHashMap> table);
template bool OrderedHashTable<OrderedHashMap, JSMapIterator, 2>::HasKey(
Handle<OrderedHashMap> table, Handle<Object> key);
template<class Derived, class TableType>
void OrderedHashTableIterator<Derived, TableType>::Transition() {
DisallowHeapAllocation no_allocation;
TableType* table = TableType::cast(this->table());
if (!table->IsObsolete()) return;
int index = Smi::cast(this->index())->value();
while (table->IsObsolete()) {
TableType* next_table = table->NextTable();
if (index > 0) {
int nod = table->NumberOfDeletedElements();
if (nod == TableType::kClearedTableSentinel) {
index = 0;
} else {
int old_index = index;
for (int i = 0; i < nod; ++i) {
int removed_index = table->RemovedIndexAt(i);
if (removed_index >= old_index) break;
--index;
}
}
}
table = next_table;
}
set_table(table);
set_index(Smi::FromInt(index));
}
template<class Derived, class TableType>
bool OrderedHashTableIterator<Derived, TableType>::HasMore() {
DisallowHeapAllocation no_allocation;
Isolate* isolate = this->GetIsolate();
if (this->table()->IsUndefined(isolate)) return false;
Transition();
TableType* table = TableType::cast(this->table());
int index = Smi::cast(this->index())->value();
int used_capacity = table->UsedCapacity();
while (index < used_capacity && table->KeyAt(index)->IsTheHole(isolate)) {
index++;
}
set_index(Smi::FromInt(index));
if (index < used_capacity) return true;
set_table(isolate->heap()->undefined_value());
return false;
}
template<class Derived, class TableType>
Smi* OrderedHashTableIterator<Derived, TableType>::Next(JSArray* value_array) {
DisallowHeapAllocation no_allocation;
if (HasMore()) {
FixedArray* array = FixedArray::cast(value_array->elements());
static_cast<Derived*>(this)->PopulateValueArray(array);
MoveNext();
return Smi::cast(kind());
}
return Smi::kZero;
}
template Smi*
OrderedHashTableIterator<JSSetIterator, OrderedHashSet>::Next(
JSArray* value_array);
template bool
OrderedHashTableIterator<JSSetIterator, OrderedHashSet>::HasMore();
template void
OrderedHashTableIterator<JSSetIterator, OrderedHashSet>::MoveNext();
template Object*
OrderedHashTableIterator<JSSetIterator, OrderedHashSet>::CurrentKey();
template void
OrderedHashTableIterator<JSSetIterator, OrderedHashSet>::Transition();
template Smi*
OrderedHashTableIterator<JSMapIterator, OrderedHashMap>::Next(
JSArray* value_array);
template bool
OrderedHashTableIterator<JSMapIterator, OrderedHashMap>::HasMore();
template void
OrderedHashTableIterator<JSMapIterator, OrderedHashMap>::MoveNext();
template Object*
OrderedHashTableIterator<JSMapIterator, OrderedHashMap>::CurrentKey();
template void
OrderedHashTableIterator<JSMapIterator, OrderedHashMap>::Transition();
void JSSet::Initialize(Handle<JSSet> set, Isolate* isolate) {
Handle<OrderedHashSet> table = isolate->factory()->NewOrderedHashSet();
set->set_table(*table);
}
void JSSet::Clear(Handle<JSSet> set) {
Handle<OrderedHashSet> table(OrderedHashSet::cast(set->table()));
table = OrderedHashSet::Clear(table);
set->set_table(*table);
}
void JSMap::Initialize(Handle<JSMap> map, Isolate* isolate) {
Handle<OrderedHashMap> table = isolate->factory()->NewOrderedHashMap();
map->set_table(*table);
}
void JSMap::Clear(Handle<JSMap> map) {
Handle<OrderedHashMap> table(OrderedHashMap::cast(map->table()));
table = OrderedHashMap::Clear(table);
map->set_table(*table);
}
void JSWeakCollection::Initialize(Handle<JSWeakCollection> weak_collection,
Isolate* isolate) {
Handle<ObjectHashTable> table = ObjectHashTable::New(isolate, 0);
weak_collection->set_table(*table);
}
void JSWeakCollection::Set(Handle<JSWeakCollection> weak_collection,
Handle<Object> key, Handle<Object> value,
int32_t hash) {
DCHECK(key->IsJSReceiver() || key->IsSymbol());
Handle<ObjectHashTable> table(
ObjectHashTable::cast(weak_collection->table()));
DCHECK(table->IsKey(*key));
Handle<ObjectHashTable> new_table =
ObjectHashTable::Put(table, key, value, hash);
weak_collection->set_table(*new_table);
if (*table != *new_table) {
// Zap the old table since we didn't record slots for its elements.
table->FillWithHoles(0, table->length());
}
}
bool JSWeakCollection::Delete(Handle<JSWeakCollection> weak_collection,
Handle<Object> key, int32_t hash) {
DCHECK(key->IsJSReceiver() || key->IsSymbol());
Handle<ObjectHashTable> table(
ObjectHashTable::cast(weak_collection->table()));
DCHECK(table->IsKey(*key));
bool was_present = false;
Handle<ObjectHashTable> new_table =
ObjectHashTable::Remove(table, key, &was_present, hash);
weak_collection->set_table(*new_table);
if (*table != *new_table) {
// Zap the old table since we didn't record slots for its elements.
table->FillWithHoles(0, table->length());
}
return was_present;
}
Handle<JSArray> JSWeakCollection::GetEntries(Handle<JSWeakCollection> holder,
int max_entries) {
Isolate* isolate = holder->GetIsolate();
Handle<ObjectHashTable> table(ObjectHashTable::cast(holder->table()));
if (max_entries == 0 || max_entries > table->NumberOfElements()) {
max_entries = table->NumberOfElements();
}
int values_per_entry = holder->IsJSWeakMap() ? 2 : 1;
Handle<FixedArray> entries =
isolate->factory()->NewFixedArray(max_entries * values_per_entry);
// Recompute max_values because GC could have removed elements from the table.
if (max_entries > table->NumberOfElements()) {
max_entries = table->NumberOfElements();
}
{
DisallowHeapAllocation no_gc;
int count = 0;
for (int i = 0;
count / values_per_entry < max_entries && i < table->Capacity(); i++) {
Handle<Object> key(table->KeyAt(i), isolate);
if (table->IsKey(isolate, *key)) {
entries->set(count++, *key);
if (values_per_entry > 1) {
Object* value = table->Lookup(key);
entries->set(count++, value);
}
}
}
DCHECK_EQ(max_entries * values_per_entry, count);
}
return isolate->factory()->NewJSArrayWithElements(entries);
}
// Check if there is a break point at this source position.
bool DebugInfo::HasBreakPoint(int source_position) {
// Get the break point info object for this code offset.
Object* break_point_info = GetBreakPointInfo(source_position);
// If there is no break point info object or no break points in the break
// point info object there is no break point at this code offset.
if (break_point_info->IsUndefined(GetIsolate())) return false;
return BreakPointInfo::cast(break_point_info)->GetBreakPointCount() > 0;
}
// Get the break point info object for this source position.
Object* DebugInfo::GetBreakPointInfo(int source_position) {
Isolate* isolate = GetIsolate();
if (!break_points()->IsUndefined(isolate)) {
for (int i = 0; i < break_points()->length(); i++) {
if (!break_points()->get(i)->IsUndefined(isolate)) {
BreakPointInfo* break_point_info =
BreakPointInfo::cast(break_points()->get(i));
if (break_point_info->source_position() == source_position) {
return break_point_info;
}
}
}
}
return isolate->heap()->undefined_value();
}
bool DebugInfo::ClearBreakPoint(Handle<DebugInfo> debug_info,
Handle<Object> break_point_object) {
Isolate* isolate = debug_info->GetIsolate();
if (debug_info->break_points()->IsUndefined(isolate)) return false;
for (int i = 0; i < debug_info->break_points()->length(); i++) {
if (debug_info->break_points()->get(i)->IsUndefined(isolate)) continue;
Handle<BreakPointInfo> break_point_info = Handle<BreakPointInfo>(
BreakPointInfo::cast(debug_info->break_points()->get(i)), isolate);
if (BreakPointInfo::HasBreakPointObject(break_point_info,
break_point_object)) {
BreakPointInfo::ClearBreakPoint(break_point_info, break_point_object);
return true;
}
}
return false;
}
void DebugInfo::SetBreakPoint(Handle<DebugInfo> debug_info, int source_position,
Handle<Object> break_point_object) {
Isolate* isolate = debug_info->GetIsolate();
Handle<Object> break_point_info(
debug_info->GetBreakPointInfo(source_position), isolate);
if (!break_point_info->IsUndefined(isolate)) {
BreakPointInfo::SetBreakPoint(
Handle<BreakPointInfo>::cast(break_point_info),
break_point_object);
return;
}
// Adding a new break point for a code offset which did not have any
// break points before. Try to find a free slot.
static const int kNoBreakPointInfo = -1;
int index = kNoBreakPointInfo;
for (int i = 0; i < debug_info->break_points()->length(); i++) {
if (debug_info->break_points()->get(i)->IsUndefined(isolate)) {
index = i;
break;
}
}
if (index == kNoBreakPointInfo) {
// No free slot - extend break point info array.
Handle<FixedArray> old_break_points = Handle<FixedArray>(
FixedArray::cast(debug_info->break_points()), isolate);
Handle<FixedArray> new_break_points =
isolate->factory()->NewFixedArray(
old_break_points->length() +
DebugInfo::kEstimatedNofBreakPointsInFunction);
debug_info->set_break_points(*new_break_points);
for (int i = 0; i < old_break_points->length(); i++) {
new_break_points->set(i, old_break_points->get(i));
}
index = old_break_points->length();
}
DCHECK(index != kNoBreakPointInfo);
// Allocate new BreakPointInfo object and set the break point.
Handle<BreakPointInfo> new_break_point_info =
isolate->factory()->NewBreakPointInfo(source_position);
BreakPointInfo::SetBreakPoint(new_break_point_info, break_point_object);
debug_info->break_points()->set(index, *new_break_point_info);
}
// Get the break point objects for a source position.
Handle<Object> DebugInfo::GetBreakPointObjects(int source_position) {
Object* break_point_info = GetBreakPointInfo(source_position);
Isolate* isolate = GetIsolate();
if (break_point_info->IsUndefined(isolate)) {
return isolate->factory()->undefined_value();
}
return Handle<Object>(
BreakPointInfo::cast(break_point_info)->break_point_objects(), isolate);
}
// Get the total number of break points.
int DebugInfo::GetBreakPointCount() {
Isolate* isolate = GetIsolate();
if (break_points()->IsUndefined(isolate)) return 0;
int count = 0;
for (int i = 0; i < break_points()->length(); i++) {
if (!break_points()->get(i)->IsUndefined(isolate)) {
BreakPointInfo* break_point_info =
BreakPointInfo::cast(break_points()->get(i));
count += break_point_info->GetBreakPointCount();
}
}
return count;
}
Handle<Object> DebugInfo::FindBreakPointInfo(
Handle<DebugInfo> debug_info, Handle<Object> break_point_object) {
Isolate* isolate = debug_info->GetIsolate();
if (!debug_info->break_points()->IsUndefined(isolate)) {
for (int i = 0; i < debug_info->break_points()->length(); i++) {
if (!debug_info->break_points()->get(i)->IsUndefined(isolate)) {
Handle<BreakPointInfo> break_point_info = Handle<BreakPointInfo>(
BreakPointInfo::cast(debug_info->break_points()->get(i)), isolate);
if (BreakPointInfo::HasBreakPointObject(break_point_info,
break_point_object)) {
return break_point_info;
}
}
}
}
return isolate->factory()->undefined_value();
}
// Remove the specified break point object.
void BreakPointInfo::ClearBreakPoint(Handle<BreakPointInfo> break_point_info,
Handle<Object> break_point_object) {
Isolate* isolate = break_point_info->GetIsolate();
// If there are no break points just ignore.
if (break_point_info->break_point_objects()->IsUndefined(isolate)) return;
// If there is a single break point clear it if it is the same.
if (!break_point_info->break_point_objects()->IsFixedArray()) {
if (break_point_info->break_point_objects() == *break_point_object) {
break_point_info->set_break_point_objects(
isolate->heap()->undefined_value());
}
return;
}
// If there are multiple break points shrink the array
DCHECK(break_point_info->break_point_objects()->IsFixedArray());
Handle<FixedArray> old_array =
Handle<FixedArray>(
FixedArray::cast(break_point_info->break_point_objects()));
Handle<FixedArray> new_array =
isolate->factory()->NewFixedArray(old_array->length() - 1);
int found_count = 0;
for (int i = 0; i < old_array->length(); i++) {
if (old_array->get(i) == *break_point_object) {
DCHECK(found_count == 0);
found_count++;
} else {
new_array->set(i - found_count, old_array->get(i));
}
}
// If the break point was found in the list change it.
if (found_count > 0) break_point_info->set_break_point_objects(*new_array);
}
// Add the specified break point object.
void BreakPointInfo::SetBreakPoint(Handle<BreakPointInfo> break_point_info,
Handle<Object> break_point_object) {
Isolate* isolate = break_point_info->GetIsolate();
// If there was no break point objects before just set it.
if (break_point_info->break_point_objects()->IsUndefined(isolate)) {
break_point_info->set_break_point_objects(*break_point_object);
return;
}
// If the break point object is the same as before just ignore.
if (break_point_info->break_point_objects() == *break_point_object) return;
// If there was one break point object before replace with array.
if (!break_point_info->break_point_objects()->IsFixedArray()) {
Handle<FixedArray> array = isolate->factory()->NewFixedArray(2);
array->set(0, break_point_info->break_point_objects());
array->set(1, *break_point_object);
break_point_info->set_break_point_objects(*array);
return;
}
// If there was more than one break point before extend array.
Handle<FixedArray> old_array =
Handle<FixedArray>(
FixedArray::cast(break_point_info->break_point_objects()));
Handle<FixedArray> new_array =
isolate->factory()->NewFixedArray(old_array->length() + 1);
for (int i = 0; i < old_array->length(); i++) {
// If the break point was there before just ignore.
if (old_array->get(i) == *break_point_object) return;
new_array->set(i, old_array->get(i));
}
// Add the new break point.
new_array->set(old_array->length(), *break_point_object);
break_point_info->set_break_point_objects(*new_array);
}
bool BreakPointInfo::HasBreakPointObject(
Handle<BreakPointInfo> break_point_info,
Handle<Object> break_point_object) {
// No break point.
Isolate* isolate = break_point_info->GetIsolate();
if (break_point_info->break_point_objects()->IsUndefined(isolate)) {
return false;
}
// Single break point.
if (!break_point_info->break_point_objects()->IsFixedArray()) {
return break_point_info->break_point_objects() == *break_point_object;
}
// Multiple break points.
FixedArray* array = FixedArray::cast(break_point_info->break_point_objects());
for (int i = 0; i < array->length(); i++) {
if (array->get(i) == *break_point_object) {
return true;
}
}
return false;
}
// Get the number of break points.
int BreakPointInfo::GetBreakPointCount() {
// No break point.
if (break_point_objects()->IsUndefined(GetIsolate())) return 0;
// Single break point.
if (!break_point_objects()->IsFixedArray()) return 1;
// Multiple break points.
return FixedArray::cast(break_point_objects())->length();
}
// static
MaybeHandle<JSDate> JSDate::New(Handle<JSFunction> constructor,
Handle<JSReceiver> new_target, double tv) {
Isolate* const isolate = constructor->GetIsolate();
Handle<JSObject> result;
ASSIGN_RETURN_ON_EXCEPTION(isolate, result,
JSObject::New(constructor, new_target), JSDate);
if (-DateCache::kMaxTimeInMs <= tv && tv <= DateCache::kMaxTimeInMs) {
tv = DoubleToInteger(tv) + 0.0;
} else {
tv = std::numeric_limits<double>::quiet_NaN();
}
Handle<Object> value = isolate->factory()->NewNumber(tv);
Handle<JSDate>::cast(result)->SetValue(*value, std::isnan(tv));
return Handle<JSDate>::cast(result);
}
// static
double JSDate::CurrentTimeValue(Isolate* isolate) {
if (FLAG_log_timer_events || FLAG_prof_cpp) LOG(isolate, CurrentTimeEvent());
// According to ECMA-262, section 15.9.1, page 117, the precision of
// the number in a Date object representing a particular instant in
// time is milliseconds. Therefore, we floor the result of getting
// the OS time.
return Floor(FLAG_verify_predictable
? isolate->heap()->MonotonicallyIncreasingTimeInMs()
: base::OS::TimeCurrentMillis());
}
// static
Object* JSDate::GetField(Object* object, Smi* index) {
return JSDate::cast(object)->DoGetField(
static_cast<FieldIndex>(index->value()));
}
Object* JSDate::DoGetField(FieldIndex index) {
DCHECK(index != kDateValue);
DateCache* date_cache = GetIsolate()->date_cache();
if (index < kFirstUncachedField) {
Object* stamp = cache_stamp();
if (stamp != date_cache->stamp() && stamp->IsSmi()) {
// Since the stamp is not NaN, the value is also not NaN.
int64_t local_time_ms =
date_cache->ToLocal(static_cast<int64_t>(value()->Number()));
SetCachedFields(local_time_ms, date_cache);
}
switch (index) {
case kYear: return year();
case kMonth: return month();
case kDay: return day();
case kWeekday: return weekday();
case kHour: return hour();
case kMinute: return min();
case kSecond: return sec();
default: UNREACHABLE();
}
}
if (index >= kFirstUTCField) {
return GetUTCField(index, value()->Number(), date_cache);
}
double time = value()->Number();
if (std::isnan(time)) return GetIsolate()->heap()->nan_value();
int64_t local_time_ms = date_cache->ToLocal(static_cast<int64_t>(time));
int days = DateCache::DaysFromTime(local_time_ms);
if (index == kDays) return Smi::FromInt(days);
int time_in_day_ms = DateCache::TimeInDay(local_time_ms, days);
if (index == kMillisecond) return Smi::FromInt(time_in_day_ms % 1000);
DCHECK(index == kTimeInDay);
return Smi::FromInt(time_in_day_ms);
}
Object* JSDate::GetUTCField(FieldIndex index,
double value,
DateCache* date_cache) {
DCHECK(index >= kFirstUTCField);
if (std::isnan(value)) return GetIsolate()->heap()->nan_value();
int64_t time_ms = static_cast<int64_t>(value);
if (index == kTimezoneOffset) {
return Smi::FromInt(date_cache->TimezoneOffset(time_ms));
}
int days = DateCache::DaysFromTime(time_ms);
if (index == kWeekdayUTC) return Smi::FromInt(date_cache->Weekday(days));
if (index <= kDayUTC) {
int year, month, day;
date_cache->YearMonthDayFromDays(days, &year, &month, &day);
if (index == kYearUTC) return Smi::FromInt(year);
if (index == kMonthUTC) return Smi::FromInt(month);
DCHECK(index == kDayUTC);
return Smi::FromInt(day);
}
int time_in_day_ms = DateCache::TimeInDay(time_ms, days);
switch (index) {
case kHourUTC: return Smi::FromInt(time_in_day_ms / (60 * 60 * 1000));
case kMinuteUTC: return Smi::FromInt((time_in_day_ms / (60 * 1000)) % 60);
case kSecondUTC: return Smi::FromInt((time_in_day_ms / 1000) % 60);
case kMillisecondUTC: return Smi::FromInt(time_in_day_ms % 1000);
case kDaysUTC: return Smi::FromInt(days);
case kTimeInDayUTC: return Smi::FromInt(time_in_day_ms);
default: UNREACHABLE();
}
UNREACHABLE();
return NULL;
}
// static
Handle<Object> JSDate::SetValue(Handle<JSDate> date, double v) {
Isolate* const isolate = date->GetIsolate();
Handle<Object> value = isolate->factory()->NewNumber(v);
bool value_is_nan = std::isnan(v);
date->SetValue(*value, value_is_nan);
return value;
}
void JSDate::SetValue(Object* value, bool is_value_nan) {
set_value(value);
if (is_value_nan) {
HeapNumber* nan = GetIsolate()->heap()->nan_value();
set_cache_stamp(nan, SKIP_WRITE_BARRIER);
set_year(nan, SKIP_WRITE_BARRIER);
set_month(nan, SKIP_WRITE_BARRIER);
set_day(nan, SKIP_WRITE_BARRIER);
set_hour(nan, SKIP_WRITE_BARRIER);
set_min(nan, SKIP_WRITE_BARRIER);
set_sec(nan, SKIP_WRITE_BARRIER);
set_weekday(nan, SKIP_WRITE_BARRIER);
} else {
set_cache_stamp(Smi::FromInt(DateCache::kInvalidStamp), SKIP_WRITE_BARRIER);
}
}
void JSDate::SetCachedFields(int64_t local_time_ms, DateCache* date_cache) {
int days = DateCache::DaysFromTime(local_time_ms);
int time_in_day_ms = DateCache::TimeInDay(local_time_ms, days);
int year, month, day;
date_cache->YearMonthDayFromDays(days, &year, &month, &day);
int weekday = date_cache->Weekday(days);
int hour = time_in_day_ms / (60 * 60 * 1000);
int min = (time_in_day_ms / (60 * 1000)) % 60;
int sec = (time_in_day_ms / 1000) % 60;
set_cache_stamp(date_cache->stamp());
set_year(Smi::FromInt(year), SKIP_WRITE_BARRIER);
set_month(Smi::FromInt(month), SKIP_WRITE_BARRIER);
set_day(Smi::FromInt(day), SKIP_WRITE_BARRIER);
set_weekday(Smi::FromInt(weekday), SKIP_WRITE_BARRIER);
set_hour(Smi::FromInt(hour), SKIP_WRITE_BARRIER);
set_min(Smi::FromInt(min), SKIP_WRITE_BARRIER);
set_sec(Smi::FromInt(sec), SKIP_WRITE_BARRIER);
}
namespace {
Script* ScriptFromJSValue(Object* in) {
DCHECK(in->IsJSValue());
JSValue* jsvalue = JSValue::cast(in);
DCHECK(jsvalue->value()->IsScript());
return Script::cast(jsvalue->value());
}
} // namespace
int JSMessageObject::GetLineNumber() const {
if (start_position() == -1) return Message::kNoLineNumberInfo;
Handle<Script> the_script = handle(ScriptFromJSValue(script()));
Script::PositionInfo info;
const Script::OffsetFlag offset_flag = Script::WITH_OFFSET;
if (!Script::GetPositionInfo(the_script, start_position(), &info,
offset_flag)) {
return Message::kNoLineNumberInfo;
}
return info.line + 1;
}
int JSMessageObject::GetColumnNumber() const {
if (start_position() == -1) return -1;
Handle<Script> the_script = handle(ScriptFromJSValue(script()));
Script::PositionInfo info;
const Script::OffsetFlag offset_flag = Script::WITH_OFFSET;
if (!Script::GetPositionInfo(the_script, start_position(), &info,
offset_flag)) {
return -1;
}
return info.column; // Note: No '+1' in contrast to GetLineNumber.
}
Handle<String> JSMessageObject::GetSourceLine() const {
Handle<Script> the_script = handle(ScriptFromJSValue(script()));
Isolate* isolate = the_script->GetIsolate();
if (the_script->type() == Script::TYPE_WASM) {
return isolate->factory()->empty_string();
}
Script::PositionInfo info;
const Script::OffsetFlag offset_flag = Script::WITH_OFFSET;
if (!Script::GetPositionInfo(the_script, start_position(), &info,
offset_flag)) {
return isolate->factory()->empty_string();
}
Handle<String> src = handle(String::cast(the_script->source()), isolate);
return isolate->factory()->NewSubString(src, info.line_start, info.line_end);
}
void JSArrayBuffer::Neuter() {
CHECK(is_neuterable());
CHECK(is_external());
set_backing_store(NULL);
set_byte_length(Smi::kZero);
set_was_neutered(true);
// Invalidate the neutering protector.
Isolate* const isolate = GetIsolate();
if (isolate->IsArrayBufferNeuteringIntact()) {
isolate->InvalidateArrayBufferNeuteringProtector();
}
}
void JSArrayBuffer::Setup(Handle<JSArrayBuffer> array_buffer, Isolate* isolate,
bool is_external, void* data, size_t allocated_length,
SharedFlag shared) {
DCHECK(array_buffer->GetInternalFieldCount() ==
v8::ArrayBuffer::kInternalFieldCount);
for (int i = 0; i < v8::ArrayBuffer::kInternalFieldCount; i++) {
array_buffer->SetInternalField(i, Smi::kZero);
}
array_buffer->set_bit_field(0);
array_buffer->set_is_external(is_external);
array_buffer->set_is_neuterable(shared == SharedFlag::kNotShared);
array_buffer->set_is_shared(shared == SharedFlag::kShared);
Handle<Object> byte_length =
isolate->factory()->NewNumberFromSize(allocated_length);
CHECK(byte_length->IsSmi() || byte_length->IsHeapNumber());
array_buffer->set_byte_length(*byte_length);
// Initialize backing store at last to avoid handling of |JSArrayBuffers| that
// are currently being constructed in the |ArrayBufferTracker|. The
// registration method below handles the case of registering a buffer that has
// already been promoted.
array_buffer->set_backing_store(data);
if (data && !is_external) {
isolate->heap()->RegisterNewArrayBuffer(*array_buffer);
}
}
bool JSArrayBuffer::SetupAllocatingData(Handle<JSArrayBuffer> array_buffer,
Isolate* isolate,
size_t allocated_length,
bool initialize, SharedFlag shared) {
void* data;
CHECK(isolate->array_buffer_allocator() != NULL);
// Prevent creating array buffers when serializing.
DCHECK(!isolate->serializer_enabled());
if (allocated_length != 0) {
if (initialize) {
data = isolate->array_buffer_allocator()->Allocate(allocated_length);
} else {
data = isolate->array_buffer_allocator()->AllocateUninitialized(
allocated_length);
}
if (data == NULL) return false;
} else {
data = NULL;
}
JSArrayBuffer::Setup(array_buffer, isolate, false, data, allocated_length,
shared);
return true;
}
Handle<JSArrayBuffer> JSTypedArray::MaterializeArrayBuffer(
Handle<JSTypedArray> typed_array) {
Handle<Map> map(typed_array->map());
Isolate* isolate = typed_array->GetIsolate();
DCHECK(IsFixedTypedArrayElementsKind(map->elements_kind()));
Handle<FixedTypedArrayBase> fixed_typed_array(
FixedTypedArrayBase::cast(typed_array->elements()));
Handle<JSArrayBuffer> buffer(JSArrayBuffer::cast(typed_array->buffer()),
isolate);
void* backing_store =
isolate->array_buffer_allocator()->AllocateUninitialized(
fixed_typed_array->DataSize());
buffer->set_is_external(false);
DCHECK(buffer->byte_length()->IsSmi() ||
buffer->byte_length()->IsHeapNumber());
DCHECK(NumberToInt32(buffer->byte_length()) == fixed_typed_array->DataSize());
// Initialize backing store at last to avoid handling of |JSArrayBuffers| that
// are currently being constructed in the |ArrayBufferTracker|. The
// registration method below handles the case of registering a buffer that has
// already been promoted.
buffer->set_backing_store(backing_store);
isolate->heap()->RegisterNewArrayBuffer(*buffer);
memcpy(buffer->backing_store(),
fixed_typed_array->DataPtr(),
fixed_typed_array->DataSize());
Handle<FixedTypedArrayBase> new_elements =
isolate->factory()->NewFixedTypedArrayWithExternalPointer(
fixed_typed_array->length(), typed_array->type(),
static_cast<uint8_t*>(buffer->backing_store()));
typed_array->set_elements(*new_elements);
return buffer;
}
Handle<JSArrayBuffer> JSTypedArray::GetBuffer() {
Handle<JSArrayBuffer> array_buffer(JSArrayBuffer::cast(buffer()),
GetIsolate());
if (array_buffer->was_neutered() ||
array_buffer->backing_store() != nullptr) {
return array_buffer;
}
Handle<JSTypedArray> self(this);
return MaterializeArrayBuffer(self);
}
Handle<PropertyCell> PropertyCell::InvalidateEntry(
Handle<GlobalDictionary> dictionary, int entry) {
Isolate* isolate = dictionary->GetIsolate();
// Swap with a copy.
DCHECK(dictionary->ValueAt(entry)->IsPropertyCell());
Handle<PropertyCell> cell(PropertyCell::cast(dictionary->ValueAt(entry)));
Handle<PropertyCell> new_cell = isolate->factory()->NewPropertyCell();
new_cell->set_value(cell->value());
dictionary->ValueAtPut(entry, *new_cell);
bool is_the_hole = cell->value()->IsTheHole(isolate);
// Cell is officially mutable henceforth.
PropertyDetails details = cell->property_details();
details = details.set_cell_type(is_the_hole ? PropertyCellType::kUninitialized
: PropertyCellType::kMutable);
new_cell->set_property_details(details);
// Old cell is ready for invalidation.
if (is_the_hole) {
cell->set_value(isolate->heap()->undefined_value());
} else {
cell->set_value(isolate->heap()->the_hole_value());
}
details = details.set_cell_type(PropertyCellType::kInvalidated);
cell->set_property_details(details);
cell->dependent_code()->DeoptimizeDependentCodeGroup(
isolate, DependentCode::kPropertyCellChangedGroup);
return new_cell;
}
PropertyCellConstantType PropertyCell::GetConstantType() {
if (value()->IsSmi()) return PropertyCellConstantType::kSmi;
return PropertyCellConstantType::kStableMap;
}
static bool RemainsConstantType(Handle<PropertyCell> cell,
Handle<Object> value) {
// TODO(dcarney): double->smi and smi->double transition from kConstant
if (cell->value()->IsSmi() && value->IsSmi()) {
return true;
} else if (cell->value()->IsHeapObject() && value->IsHeapObject()) {
return HeapObject::cast(cell->value())->map() ==
HeapObject::cast(*value)->map() &&
HeapObject::cast(*value)->map()->is_stable();
}
return false;
}
PropertyCellType PropertyCell::UpdatedType(Handle<PropertyCell> cell,
Handle<Object> value,
PropertyDetails details) {
PropertyCellType type = details.cell_type();
Isolate* isolate = cell->GetIsolate();
DCHECK(!value->IsTheHole(isolate));
if (cell->value()->IsTheHole(isolate)) {
switch (type) {
// Only allow a cell to transition once into constant state.
case PropertyCellType::kUninitialized:
if (value->IsUndefined(isolate)) return PropertyCellType::kUndefined;
return PropertyCellType::kConstant;
case PropertyCellType::kInvalidated:
return PropertyCellType::kMutable;
default:
UNREACHABLE();
return PropertyCellType::kMutable;
}
}
switch (type) {
case PropertyCellType::kUndefined:
return PropertyCellType::kConstant;
case PropertyCellType::kConstant:
if (*value == cell->value()) return PropertyCellType::kConstant;
// Fall through.
case PropertyCellType::kConstantType:
if (RemainsConstantType(cell, value)) {
return PropertyCellType::kConstantType;
}
// Fall through.
case PropertyCellType::kMutable:
return PropertyCellType::kMutable;
}
UNREACHABLE();
return PropertyCellType::kMutable;
}
Handle<PropertyCell> PropertyCell::PrepareForValue(
Handle<GlobalDictionary> dictionary, int entry, Handle<Object> value,
PropertyDetails details) {
Isolate* isolate = dictionary->GetIsolate();
DCHECK(!value->IsTheHole(isolate));
DCHECK(dictionary->ValueAt(entry)->IsPropertyCell());
Handle<PropertyCell> cell(PropertyCell::cast(dictionary->ValueAt(entry)));
const PropertyDetails original_details = cell->property_details();
// Data accesses could be cached in ics or optimized code.
bool invalidate =
original_details.kind() == kData && details.kind() == kAccessor;
int index = original_details.dictionary_index();
PropertyCellType old_type = original_details.cell_type();
// Preserve the enumeration index unless the property was deleted or never
// initialized.
if (cell->value()->IsTheHole(isolate)) {
index = dictionary->NextEnumerationIndex();
dictionary->SetNextEnumerationIndex(index + 1);
}
DCHECK(index > 0);
details = details.set_index(index);
PropertyCellType new_type = UpdatedType(cell, value, original_details);
if (invalidate) cell = PropertyCell::InvalidateEntry(dictionary, entry);
// Install new property details.
details = details.set_cell_type(new_type);
cell->set_property_details(details);
// Deopt when transitioning from a constant type.
if (!invalidate && (old_type != new_type ||
original_details.IsReadOnly() != details.IsReadOnly())) {
cell->dependent_code()->DeoptimizeDependentCodeGroup(
isolate, DependentCode::kPropertyCellChangedGroup);
}
return cell;
}
// static
void PropertyCell::SetValueWithInvalidation(Handle<PropertyCell> cell,
Handle<Object> new_value) {
if (cell->value() != *new_value) {
cell->set_value(*new_value);
Isolate* isolate = cell->GetIsolate();
cell->dependent_code()->DeoptimizeDependentCodeGroup(
isolate, DependentCode::kPropertyCellChangedGroup);
}
}
int JSGeneratorObject::source_position() const {
CHECK(is_suspended());
DCHECK(function()->shared()->HasBytecodeArray());
DCHECK(!function()->shared()->HasBaselineCode());
int code_offset = Smi::cast(input_or_debug_pos())->value();
// The stored bytecode offset is relative to a different base than what
// is used in the source position table, hence the subtraction.
code_offset -= BytecodeArray::kHeaderSize - kHeapObjectTag;
AbstractCode* code =
AbstractCode::cast(function()->shared()->bytecode_array());
return code->SourcePosition(code_offset);
}
// static
AccessCheckInfo* AccessCheckInfo::Get(Isolate* isolate,
Handle<JSObject> receiver) {
DisallowHeapAllocation no_gc;
DCHECK(receiver->map()->is_access_check_needed());
Object* maybe_constructor = receiver->map()->GetConstructor();
// Might happen for a detached context.
if (!maybe_constructor->IsJSFunction()) return nullptr;
JSFunction* constructor = JSFunction::cast(maybe_constructor);
// Might happen for the debug context.
if (!constructor->shared()->IsApiFunction()) return nullptr;
Object* data_obj =
constructor->shared()->get_api_func_data()->access_check_info();
if (data_obj->IsUndefined(isolate)) return nullptr;
return AccessCheckInfo::cast(data_obj);
}
bool JSReceiver::HasProxyInPrototype(Isolate* isolate) {
for (PrototypeIterator iter(isolate, this, kStartAtReceiver,
PrototypeIterator::END_AT_NULL);
!iter.IsAtEnd(); iter.AdvanceIgnoringProxies()) {
if (iter.GetCurrent<Object>()->IsJSProxy()) return true;
}
return false;
}
MaybeHandle<Object> JSModuleNamespace::GetExport(Handle<String> name) {
Isolate* isolate = name->GetIsolate();
Handle<Object> object(module()->exports()->Lookup(name), isolate);
if (object->IsTheHole(isolate)) {
return isolate->factory()->undefined_value();
}
Handle<Object> value(Handle<Cell>::cast(object)->value(), isolate);
if (value->IsTheHole(isolate)) {
THROW_NEW_ERROR(
isolate, NewReferenceError(MessageTemplate::kNotDefined, name), Object);
}
return value;
}
namespace {
struct ModuleHandleHash {
V8_INLINE size_t operator()(Handle<Module> module) const {
return module->hash();
}
};
struct ModuleHandleEqual {
V8_INLINE bool operator()(Handle<Module> lhs, Handle<Module> rhs) const {
return *lhs == *rhs;
}
};
struct StringHandleHash {
V8_INLINE size_t operator()(Handle<String> string) const {
return string->Hash();
}
};
struct StringHandleEqual {
V8_INLINE bool operator()(Handle<String> lhs, Handle<String> rhs) const {
return lhs->Equals(*rhs);
}
};
class UnorderedStringSet
: public std::unordered_set<Handle<String>, StringHandleHash,
StringHandleEqual,
zone_allocator<Handle<String>>> {
public:
explicit UnorderedStringSet(Zone* zone)
: std::unordered_set<Handle<String>, StringHandleHash, StringHandleEqual,
zone_allocator<Handle<String>>>(
2 /* bucket count */, StringHandleHash(), StringHandleEqual(),
zone_allocator<Handle<String>>(zone)) {}
};
class UnorderedModuleSet
: public std::unordered_set<Handle<Module>, ModuleHandleHash,
ModuleHandleEqual,
zone_allocator<Handle<Module>>> {
public:
explicit UnorderedModuleSet(Zone* zone)
: std::unordered_set<Handle<Module>, ModuleHandleHash, ModuleHandleEqual,
zone_allocator<Handle<Module>>>(
2 /* bucket count */, ModuleHandleHash(), ModuleHandleEqual(),
zone_allocator<Handle<Module>>(zone)) {}
};
class UnorderedStringMap
: public std::unordered_map<
Handle<String>, Handle<Object>, StringHandleHash, StringHandleEqual,
zone_allocator<std::pair<const Handle<String>, Handle<Object>>>> {
public:
explicit UnorderedStringMap(Zone* zone)
: std::unordered_map<
Handle<String>, Handle<Object>, StringHandleHash, StringHandleEqual,
zone_allocator<std::pair<const Handle<String>, Handle<Object>>>>(
2 /* bucket count */, StringHandleHash(), StringHandleEqual(),
zone_allocator<std::pair<const Handle<String>, Handle<Object>>>(
zone)) {}
};
} // anonymous namespace
class Module::ResolveSet
: public std::unordered_map<
Handle<Module>, UnorderedStringSet*, ModuleHandleHash,
ModuleHandleEqual, zone_allocator<std::pair<const Handle<Module>,
UnorderedStringSet*>>> {
public:
explicit ResolveSet(Zone* zone)
: std::unordered_map<Handle<Module>, UnorderedStringSet*,
ModuleHandleHash, ModuleHandleEqual,
zone_allocator<std::pair<const Handle<Module>,
UnorderedStringSet*>>>(
2 /* bucket count */, ModuleHandleHash(), ModuleHandleEqual(),
zone_allocator<
std::pair<const Handle<Module>, UnorderedStringSet*>>(zone)),
zone_(zone) {}
Zone* zone() const { return zone_; }
private:
Zone* zone_;
};
namespace {
int ExportIndex(int cell_index) {
DCHECK_EQ(ModuleDescriptor::GetCellIndexKind(cell_index),
ModuleDescriptor::kExport);
return cell_index - 1;
}
int ImportIndex(int cell_index) {
DCHECK_EQ(ModuleDescriptor::GetCellIndexKind(cell_index),
ModuleDescriptor::kImport);
return -cell_index - 1;
}
} // anonymous namespace
void Module::CreateIndirectExport(Handle<Module> module, Handle<String> name,
Handle<ModuleInfoEntry> entry) {
Isolate* isolate = module->GetIsolate();
Handle<ObjectHashTable> exports(module->exports(), isolate);
DCHECK(exports->Lookup(name)->IsTheHole(isolate));
exports = ObjectHashTable::Put(exports, name, entry);
module->set_exports(*exports);
}
void Module::CreateExport(Handle<Module> module, int cell_index,
Handle<FixedArray> names) {
DCHECK_LT(0, names->length());
Isolate* isolate = module->GetIsolate();
Handle<Cell> cell =
isolate->factory()->NewCell(isolate->factory()->undefined_value());
module->regular_exports()->set(ExportIndex(cell_index), *cell);
Handle<ObjectHashTable> exports(module->exports(), isolate);
for (int i = 0, n = names->length(); i < n; ++i) {
Handle<String> name(String::cast(names->get(i)), isolate);
DCHECK(exports->Lookup(name)->IsTheHole(isolate));
exports = ObjectHashTable::Put(exports, name, cell);
}
module->set_exports(*exports);
}
Handle<Object> Module::LoadVariable(Handle<Module> module, int cell_index) {
Isolate* isolate = module->GetIsolate();
Handle<Object> object;
switch (ModuleDescriptor::GetCellIndexKind(cell_index)) {
case ModuleDescriptor::kImport:
object = handle(module->regular_imports()->get(ImportIndex(cell_index)),
isolate);
break;
case ModuleDescriptor::kExport:
object = handle(module->regular_exports()->get(ExportIndex(cell_index)),
isolate);
break;
case ModuleDescriptor::kInvalid:
UNREACHABLE();
break;
}
return handle(Handle<Cell>::cast(object)->value(), isolate);
}
void Module::StoreVariable(Handle<Module> module, int cell_index,
Handle<Object> value) {
Isolate* isolate = module->GetIsolate();
DCHECK_EQ(ModuleDescriptor::GetCellIndexKind(cell_index),
ModuleDescriptor::kExport);
Handle<Object> object(module->regular_exports()->get(ExportIndex(cell_index)),
isolate);
Handle<Cell>::cast(object)->set_value(*value);
}
MaybeHandle<Cell> Module::ResolveImport(Handle<Module> module,
Handle<String> name, int module_request,
MessageLocation loc, bool must_resolve,
Module::ResolveSet* resolve_set) {
Isolate* isolate = module->GetIsolate();
Handle<Module> requested_module(
Module::cast(module->requested_modules()->get(module_request)), isolate);
return Module::ResolveExport(requested_module, name, loc, must_resolve,
resolve_set);
}
MaybeHandle<Cell> Module::ResolveExport(Handle<Module> module,
Handle<String> name,
MessageLocation loc, bool must_resolve,
Module::ResolveSet* resolve_set) {
Isolate* isolate = module->GetIsolate();
Handle<Object> object(module->exports()->Lookup(name), isolate);
if (object->IsCell()) {
// Already resolved (e.g. because it's a local export).
return Handle<Cell>::cast(object);
}
// Check for cycle before recursing.
{
// Attempt insertion with a null string set.
auto result = resolve_set->insert({module, nullptr});
UnorderedStringSet*& name_set = result.first->second;
if (result.second) {
// |module| wasn't in the map previously, so allocate a new name set.
Zone* zone = resolve_set->zone();
name_set =
new (zone->New(sizeof(UnorderedStringSet))) UnorderedStringSet(zone);
} else if (name_set->count(name)) {
// Cycle detected.
if (must_resolve) {
return isolate->Throw<Cell>(
isolate->factory()->NewSyntaxError(
MessageTemplate::kCyclicModuleDependency, name),
&loc);
}
return MaybeHandle<Cell>();
}
name_set->insert(name);
}
if (object->IsModuleInfoEntry()) {
// Not yet resolved indirect export.
Handle<ModuleInfoEntry> entry = Handle<ModuleInfoEntry>::cast(object);
Handle<String> import_name(String::cast(entry->import_name()), isolate);
Handle<Script> script(
Script::cast(JSFunction::cast(module->code())->shared()->script()),
isolate);
MessageLocation new_loc(script, entry->beg_pos(), entry->end_pos());
Handle<Cell> cell;
if (!ResolveImport(module, import_name, entry->module_request(), new_loc,
true, resolve_set)
.ToHandle(&cell)) {
DCHECK(isolate->has_pending_exception());
return MaybeHandle<Cell>();
}
// The export table may have changed but the entry in question should be
// unchanged.
Handle<ObjectHashTable> exports(module->exports(), isolate);
DCHECK(exports->Lookup(name)->IsModuleInfoEntry());
exports = ObjectHashTable::Put(exports, name, cell);
module->set_exports(*exports);
return cell;
}
DCHECK(object->IsTheHole(isolate));
return Module::ResolveExportUsingStarExports(module, name, loc, must_resolve,
resolve_set);
}
MaybeHandle<Cell> Module::ResolveExportUsingStarExports(
Handle<Module> module, Handle<String> name, MessageLocation loc,
bool must_resolve, Module::ResolveSet* resolve_set) {
Isolate* isolate = module->GetIsolate();
if (!name->Equals(isolate->heap()->default_string())) {
// Go through all star exports looking for the given name. If multiple star
// exports provide the name, make sure they all map it to the same cell.
Handle<Cell> unique_cell;
Handle<FixedArray> special_exports(module->info()->special_exports(),
isolate);
for (int i = 0, n = special_exports->length(); i < n; ++i) {
i::Handle<i::ModuleInfoEntry> entry(
i::ModuleInfoEntry::cast(special_exports->get(i)), isolate);
if (!entry->export_name()->IsUndefined(isolate)) {
continue; // Indirect export.
}
Handle<Script> script(
Script::cast(JSFunction::cast(module->code())->shared()->script()),
isolate);
MessageLocation new_loc(script, entry->beg_pos(), entry->end_pos());
Handle<Cell> cell;
if (ResolveImport(module, name, entry->module_request(), new_loc, false,
resolve_set)
.ToHandle(&cell)) {
if (unique_cell.is_null()) unique_cell = cell;
if (*unique_cell != *cell) {
return isolate->Throw<Cell>(
isolate->factory()->NewSyntaxError(
MessageTemplate::kAmbiguousExport, name),
&loc);
}
} else if (isolate->has_pending_exception()) {
return MaybeHandle<Cell>();
}
}
if (!unique_cell.is_null()) {
// Found a unique star export for this name.
Handle<ObjectHashTable> exports(module->exports(), isolate);
DCHECK(exports->Lookup(name)->IsTheHole(isolate));
exports = ObjectHashTable::Put(exports, name, unique_cell);
module->set_exports(*exports);
return unique_cell;
}
}
// Unresolvable.
if (must_resolve) {
return isolate->Throw<Cell>(isolate->factory()->NewSyntaxError(
MessageTemplate::kUnresolvableExport, name),
&loc);
}
return MaybeHandle<Cell>();
}
bool Module::Instantiate(Handle<Module> module, v8::Local<v8::Context> context,
v8::Module::ResolveCallback callback) {
if (module->instantiated()) return true;
Isolate* isolate = module->GetIsolate();
Handle<SharedFunctionInfo> shared(SharedFunctionInfo::cast(module->code()),
isolate);
Handle<JSFunction> function =
isolate->factory()->NewFunctionFromSharedFunctionInfo(
shared,
handle(Utils::OpenHandle(*context)->native_context(), isolate));
module->set_code(*function);
DCHECK(module->instantiated());
Handle<ModuleInfo> module_info(shared->scope_info()->ModuleDescriptorInfo(),
isolate);
// Set up local exports.
// TODO(neis): Create regular_exports array here instead of in factory method?
for (int i = 0, n = module_info->RegularExportCount(); i < n; ++i) {
int cell_index = module_info->RegularExportCellIndex(i);
Handle<FixedArray> export_names(module_info->RegularExportExportNames(i),
isolate);
CreateExport(module, cell_index, export_names);
}
// Partially set up indirect exports.
// For each indirect export, we create the appropriate slot in the export
// table and store its ModuleInfoEntry there. When we later find the correct
// Cell in the module that actually provides the value, we replace the
// ModuleInfoEntry by that Cell (see ResolveExport).
Handle<FixedArray> special_exports(module_info->special_exports(), isolate);
for (int i = 0, n = special_exports->length(); i < n; ++i) {
Handle<ModuleInfoEntry> entry(
ModuleInfoEntry::cast(special_exports->get(i)), isolate);
Handle<Object> export_name(entry->export_name(), isolate);
if (export_name->IsUndefined(isolate)) continue; // Star export.
CreateIndirectExport(module, Handle<String>::cast(export_name), entry);
}
Handle<FixedArray> module_requests(module_info->module_requests(), isolate);
for (int i = 0, length = module_requests->length(); i < length; ++i) {
Handle<String> specifier(String::cast(module_requests->get(i)), isolate);
v8::Local<v8::Module> api_requested_module;
// TODO(adamk): Revisit these failure cases once d8 knows how to
// persist a module_map across multiple top-level module loads, as
// the current module is left in a "half-instantiated" state.
if (!callback(context, v8::Utils::ToLocal(specifier),
v8::Utils::ToLocal(module))
.ToLocal(&api_requested_module)) {
// TODO(adamk): Give this a better error message. But this is a
// misuse of the API anyway.
isolate->ThrowIllegalOperation();
return false;
}
Handle<Module> requested_module = Utils::OpenHandle(*api_requested_module);
module->requested_modules()->set(i, *requested_module);
if (!Instantiate(requested_module, context, callback)) {
return false;
}
}
Zone zone(isolate->allocator(), ZONE_NAME);
// Resolve imports.
Handle<FixedArray> regular_imports(module_info->regular_imports(), isolate);
for (int i = 0, n = regular_imports->length(); i < n; ++i) {
Handle<ModuleInfoEntry> entry(
ModuleInfoEntry::cast(regular_imports->get(i)), isolate);
Handle<String> name(String::cast(entry->import_name()), isolate);
Handle<Script> script(
Script::cast(JSFunction::cast(module->code())->shared()->script()),
isolate);
MessageLocation loc(script, entry->beg_pos(), entry->end_pos());
ResolveSet resolve_set(&zone);
Handle<Cell> cell;
if (!ResolveImport(module, name, entry->module_request(), loc, true,
&resolve_set)
.ToHandle(&cell)) {
return false;
}
module->regular_imports()->set(ImportIndex(entry->cell_index()), *cell);
}
// Resolve indirect exports.
for (int i = 0, n = special_exports->length(); i < n; ++i) {
Handle<ModuleInfoEntry> entry(
ModuleInfoEntry::cast(special_exports->get(i)), isolate);
Handle<Object> name(entry->export_name(), isolate);
if (name->IsUndefined(isolate)) continue; // Star export.
Handle<Script> script(
Script::cast(JSFunction::cast(module->code())->shared()->script()),
isolate);
MessageLocation loc(script, entry->beg_pos(), entry->end_pos());
ResolveSet resolve_set(&zone);
if (ResolveExport(module, Handle<String>::cast(name), loc, true,
&resolve_set)
.is_null()) {
return false;
}
}
return true;
}
MaybeHandle<Object> Module::Evaluate(Handle<Module> module) {
DCHECK(module->instantiated());
// Each module can only be evaluated once.
Isolate* isolate = module->GetIsolate();
if (module->evaluated()) return isolate->factory()->undefined_value();
Handle<JSFunction> function(JSFunction::cast(module->code()), isolate);
module->set_evaluated();
// Initialization.
DCHECK_EQ(MODULE_SCOPE, function->shared()->scope_info()->scope_type());
Handle<Object> receiver = isolate->factory()->undefined_value();
Handle<Object> argv[] = {module};
Handle<Object> generator;
ASSIGN_RETURN_ON_EXCEPTION(
isolate, generator,
Execution::Call(isolate, function, receiver, arraysize(argv), argv),
Object);
// Recursion.
Handle<FixedArray> requested_modules(module->requested_modules(), isolate);
for (int i = 0, length = requested_modules->length(); i < length; ++i) {
Handle<Module> import(Module::cast(requested_modules->get(i)), isolate);
RETURN_ON_EXCEPTION(isolate, Evaluate(import), Object);
}
// Evaluation of module body.
Handle<JSFunction> resume(
isolate->native_context()->generator_next_internal(), isolate);
return Execution::Call(isolate, resume, generator, 0, nullptr);
}
namespace {
void FetchStarExports(Handle<Module> module, Zone* zone,
UnorderedModuleSet* visited) {
DCHECK(module->instantiated());
bool cycle = !visited->insert(module).second;
if (cycle) return;
Isolate* isolate = module->GetIsolate();
Handle<ObjectHashTable> exports(module->exports(), isolate);
UnorderedStringMap more_exports(zone);
// TODO(neis): Only allocate more_exports if there are star exports.
// Maybe split special_exports into indirect_exports and star_exports.
Handle<FixedArray> special_exports(module->info()->special_exports(),
isolate);
for (int i = 0, n = special_exports->length(); i < n; ++i) {
Handle<ModuleInfoEntry> entry(
ModuleInfoEntry::cast(special_exports->get(i)), isolate);
if (!entry->export_name()->IsUndefined(isolate)) {
continue; // Indirect export.
}
Handle<Module> requested_module(
Module::cast(module->requested_modules()->get(entry->module_request())),
isolate);
// Recurse.
FetchStarExports(requested_module, zone, visited);
// Collect all of [requested_module]'s exports that must be added to
// [module]'s exports (i.e. to [exports]). We record these in
// [more_exports]. Ambiguities (conflicting exports) are marked by mapping
// the name to undefined instead of a Cell.
Handle<ObjectHashTable> requested_exports(requested_module->exports(),
isolate);
for (int i = 0, n = requested_exports->Capacity(); i < n; ++i) {
Handle<Object> key(requested_exports->KeyAt(i), isolate);
if (!requested_exports->IsKey(isolate, *key)) continue;
Handle<String> name = Handle<String>::cast(key);
if (name->Equals(isolate->heap()->default_string())) continue;
if (!exports->Lookup(name)->IsTheHole(isolate)) continue;
Handle<Cell> cell(Cell::cast(requested_exports->ValueAt(i)), isolate);
auto insert_result = more_exports.insert(std::make_pair(name, cell));
if (!insert_result.second) {
auto it = insert_result.first;
if (*it->second == *cell || it->second->IsUndefined(isolate)) {
// We already recorded this mapping before, or the name is already
// known to be ambiguous. In either case, there's nothing to do.
} else {
DCHECK(it->second->IsCell());
// Different star exports provide different cells for this name, hence
// mark the name as ambiguous.
it->second = isolate->factory()->undefined_value();
}
}
}
}
// Copy [more_exports] into [exports].
for (const auto& elem : more_exports) {
if (elem.second->IsUndefined(isolate)) continue; // Ambiguous export.
DCHECK(!elem.first->Equals(isolate->heap()->default_string()));
DCHECK(elem.second->IsCell());
exports = ObjectHashTable::Put(exports, elem.first, elem.second);
}
module->set_exports(*exports);
}
} // anonymous namespace
Handle<JSModuleNamespace> Module::GetModuleNamespace(Handle<Module> module,
int module_request) {
Isolate* isolate = module->GetIsolate();
Handle<Module> requested_module(
Module::cast(module->requested_modules()->get(module_request)), isolate);
return Module::GetModuleNamespace(requested_module);
}
Handle<JSModuleNamespace> Module::GetModuleNamespace(Handle<Module> module) {
Isolate* isolate = module->GetIsolate();
Handle<HeapObject> object(module->module_namespace(), isolate);
if (!object->IsUndefined(isolate)) {
// Namespace object already exists.
return Handle<JSModuleNamespace>::cast(object);
}
// Create the namespace object (initially empty).
Handle<JSModuleNamespace> ns = isolate->factory()->NewJSModuleNamespace();
ns->set_module(*module);
module->set_module_namespace(*ns);
// Collect the export names.
Zone zone(isolate->allocator(), ZONE_NAME);
UnorderedModuleSet visited(&zone);
FetchStarExports(module, &zone, &visited);
Handle<ObjectHashTable> exports(module->exports(), isolate);
ZoneVector<Handle<String>> names(&zone);
names.reserve(exports->NumberOfElements());
for (int i = 0, n = exports->Capacity(); i < n; ++i) {
Handle<Object> key(exports->KeyAt(i), isolate);
if (!exports->IsKey(isolate, *key)) continue;
DCHECK(exports->ValueAt(i)->IsCell());
names.push_back(Handle<String>::cast(key));
}
DCHECK_EQ(static_cast<int>(names.size()), exports->NumberOfElements());
// Sort them alphabetically.
struct {
bool operator()(Handle<String> a, Handle<String> b) {
return String::Compare(a, b) == ComparisonResult::kLessThan;
}
} StringLess;
std::sort(names.begin(), names.end(), StringLess);
// Create the corresponding properties in the namespace object.
PropertyAttributes attr = DONT_DELETE;
for (const auto& name : names) {
JSObject::SetAccessor(
ns, Accessors::ModuleNamespaceEntryInfo(isolate, name, attr))
.Check();
}
JSObject::PreventExtensions(ns, THROW_ON_ERROR).ToChecked();
return ns;
}
MaybeHandle<Name> FunctionTemplateInfo::TryGetCachedPropertyName(
Isolate* isolate, Handle<Object> getter) {
if (getter->IsFunctionTemplateInfo()) {
Handle<FunctionTemplateInfo> fti =
Handle<FunctionTemplateInfo>::cast(getter);
// Check if the accessor uses a cached property.
if (!fti->cached_property_name()->IsTheHole(isolate)) {
return handle(Name::cast(fti->cached_property_name()));
}
}
return MaybeHandle<Name>();
}
// static
ElementsKind JSArrayIterator::ElementsKindForInstanceType(InstanceType type) {
DCHECK_GE(type, FIRST_ARRAY_ITERATOR_TYPE);
DCHECK_LE(type, LAST_ARRAY_ITERATOR_TYPE);
if (type <= LAST_ARRAY_KEY_ITERATOR_TYPE) {
// Should be ignored for key iterators.
return FAST_ELEMENTS;
} else {
ElementsKind kind;
if (type < FIRST_ARRAY_VALUE_ITERATOR_TYPE) {
// Convert `type` to a value iterator from an entries iterator
type = static_cast<InstanceType>(type +
(FIRST_ARRAY_VALUE_ITERATOR_TYPE -
FIRST_ARRAY_KEY_VALUE_ITERATOR_TYPE));
DCHECK_GE(type, FIRST_ARRAY_VALUE_ITERATOR_TYPE);
DCHECK_LE(type, LAST_ARRAY_ITERATOR_TYPE);
}
if (type <= JS_UINT8_CLAMPED_ARRAY_VALUE_ITERATOR_TYPE) {
kind =
static_cast<ElementsKind>(FIRST_FIXED_TYPED_ARRAY_ELEMENTS_KIND +
(type - FIRST_ARRAY_VALUE_ITERATOR_TYPE));
DCHECK_LE(kind, LAST_FIXED_TYPED_ARRAY_ELEMENTS_KIND);
} else if (type < JS_GENERIC_ARRAY_VALUE_ITERATOR_TYPE) {
kind = static_cast<ElementsKind>(
FIRST_FAST_ELEMENTS_KIND +
(type - JS_FAST_SMI_ARRAY_VALUE_ITERATOR_TYPE));
DCHECK_LE(kind, LAST_FAST_ELEMENTS_KIND);
} else {
// For any slow element cases, the actual elements kind is not known.
// Simply
// return a slow elements kind in this case. Users of this function must
// not
// depend on this.
return DICTIONARY_ELEMENTS;
}
DCHECK_LE(kind, LAST_ELEMENTS_KIND);
return kind;
}
}
} // namespace internal
} // namespace v8