// Copyright 2012 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/v8.h"
#include "src/accessors.h"
#include "src/api.h"
#include "src/arguments.h"
#include "src/base/bits.h"
#include "src/codegen.h"
#include "src/conversions.h"
#include "src/execution.h"
#include "src/ic/call-optimization.h"
#include "src/ic/handler-compiler.h"
#include "src/ic/ic-inl.h"
#include "src/ic/ic-compiler.h"
#include "src/ic/stub-cache.h"
#include "src/prototype.h"
#include "src/runtime.h"
namespace v8 {
namespace internal {
char IC::TransitionMarkFromState(IC::State state) {
switch (state) {
case UNINITIALIZED:
return '0';
case PREMONOMORPHIC:
return '.';
case MONOMORPHIC:
return '1';
case PROTOTYPE_FAILURE:
return '^';
case POLYMORPHIC:
return 'P';
case MEGAMORPHIC:
return 'N';
case GENERIC:
return 'G';
// We never see the debugger states here, because the state is
// computed from the original code - not the patched code. Let
// these cases fall through to the unreachable code below.
case DEBUG_STUB:
break;
// Type-vector-based ICs resolve state to one of the above.
case DEFAULT:
break;
}
UNREACHABLE();
return 0;
}
const char* GetTransitionMarkModifier(KeyedAccessStoreMode mode) {
if (mode == STORE_NO_TRANSITION_HANDLE_COW) return ".COW";
if (mode == STORE_NO_TRANSITION_IGNORE_OUT_OF_BOUNDS) {
return ".IGNORE_OOB";
}
if (IsGrowStoreMode(mode)) return ".GROW";
return "";
}
#ifdef DEBUG
#define TRACE_GENERIC_IC(isolate, type, reason) \
do { \
if (FLAG_trace_ic) { \
PrintF("[%s patching generic stub in ", type); \
JavaScriptFrame::PrintTop(isolate, stdout, false, true); \
PrintF(" (%s)]\n", reason); \
} \
} while (false)
#else
#define TRACE_GENERIC_IC(isolate, type, reason) \
do { \
if (FLAG_trace_ic) { \
PrintF("[%s patching generic stub in ", type); \
PrintF("(see below) (%s)]\n", reason); \
} \
} while (false)
#endif // DEBUG
void IC::TraceIC(const char* type, Handle<Object> name) {
if (FLAG_trace_ic) {
Code* new_target = raw_target();
State new_state = new_target->ic_state();
TraceIC(type, name, state(), new_state);
}
}
void IC::TraceIC(const char* type, Handle<Object> name, State old_state,
State new_state) {
if (FLAG_trace_ic) {
Code* new_target = raw_target();
PrintF("[%s%s in ", new_target->is_keyed_stub() ? "Keyed" : "", type);
// TODO(jkummerow): Add support for "apply". The logic is roughly:
// marker = [fp_ + kMarkerOffset];
// if marker is smi and marker.value == INTERNAL and
// the frame's code == builtin(Builtins::kFunctionApply):
// then print "apply from" and advance one frame
Object* maybe_function =
Memory::Object_at(fp_ + JavaScriptFrameConstants::kFunctionOffset);
if (maybe_function->IsJSFunction()) {
JSFunction* function = JSFunction::cast(maybe_function);
JavaScriptFrame::PrintFunctionAndOffset(function, function->code(), pc(),
stdout, true);
}
ExtraICState extra_state = new_target->extra_ic_state();
const char* modifier = "";
if (new_target->kind() == Code::KEYED_STORE_IC) {
modifier = GetTransitionMarkModifier(
KeyedStoreIC::GetKeyedAccessStoreMode(extra_state));
}
PrintF(" (%c->%c%s)", TransitionMarkFromState(old_state),
TransitionMarkFromState(new_state), modifier);
#ifdef OBJECT_PRINT
OFStream os(stdout);
name->Print(os);
#else
name->ShortPrint(stdout);
#endif
PrintF("]\n");
}
}
#define TRACE_IC(type, name) TraceIC(type, name)
#define TRACE_VECTOR_IC(type, name, old_state, new_state) \
TraceIC(type, name, old_state, new_state)
IC::IC(FrameDepth depth, Isolate* isolate)
: isolate_(isolate), target_set_(false), target_maps_set_(false) {
// To improve the performance of the (much used) IC code, we unfold a few
// levels of the stack frame iteration code. This yields a ~35% speedup when
// running DeltaBlue and a ~25% speedup of gbemu with the '--nouse-ic' flag.
const Address entry = Isolate::c_entry_fp(isolate->thread_local_top());
Address constant_pool = NULL;
if (FLAG_enable_ool_constant_pool) {
constant_pool =
Memory::Address_at(entry + ExitFrameConstants::kConstantPoolOffset);
}
Address* pc_address =
reinterpret_cast<Address*>(entry + ExitFrameConstants::kCallerPCOffset);
Address fp = Memory::Address_at(entry + ExitFrameConstants::kCallerFPOffset);
// If there's another JavaScript frame on the stack or a
// StubFailureTrampoline, we need to look one frame further down the stack to
// find the frame pointer and the return address stack slot.
if (depth == EXTRA_CALL_FRAME) {
if (FLAG_enable_ool_constant_pool) {
constant_pool =
Memory::Address_at(fp + StandardFrameConstants::kConstantPoolOffset);
}
const int kCallerPCOffset = StandardFrameConstants::kCallerPCOffset;
pc_address = reinterpret_cast<Address*>(fp + kCallerPCOffset);
fp = Memory::Address_at(fp + StandardFrameConstants::kCallerFPOffset);
}
#ifdef DEBUG
StackFrameIterator it(isolate);
for (int i = 0; i < depth + 1; i++) it.Advance();
StackFrame* frame = it.frame();
DCHECK(fp == frame->fp() && pc_address == frame->pc_address());
#endif
fp_ = fp;
if (FLAG_enable_ool_constant_pool) {
raw_constant_pool_ = handle(
ConstantPoolArray::cast(reinterpret_cast<Object*>(constant_pool)),
isolate);
}
pc_address_ = StackFrame::ResolveReturnAddressLocation(pc_address);
target_ = handle(raw_target(), isolate);
state_ = target_->ic_state();
kind_ = target_->kind();
extra_ic_state_ = target_->extra_ic_state();
}
SharedFunctionInfo* IC::GetSharedFunctionInfo() const {
// Compute the JavaScript frame for the frame pointer of this IC
// structure. We need this to be able to find the function
// corresponding to the frame.
StackFrameIterator it(isolate());
while (it.frame()->fp() != this->fp()) it.Advance();
JavaScriptFrame* frame = JavaScriptFrame::cast(it.frame());
// Find the function on the stack and both the active code for the
// function and the original code.
JSFunction* function = frame->function();
return function->shared();
}
Code* IC::GetCode() const {
HandleScope scope(isolate());
Handle<SharedFunctionInfo> shared(GetSharedFunctionInfo(), isolate());
Code* code = shared->code();
return code;
}
Code* IC::GetOriginalCode() const {
HandleScope scope(isolate());
Handle<SharedFunctionInfo> shared(GetSharedFunctionInfo(), isolate());
DCHECK(Debug::HasDebugInfo(shared));
Code* original_code = Debug::GetDebugInfo(shared)->original_code();
DCHECK(original_code->IsCode());
return original_code;
}
static void LookupForRead(LookupIterator* it) {
for (; it->IsFound(); it->Next()) {
switch (it->state()) {
case LookupIterator::NOT_FOUND:
case LookupIterator::TRANSITION:
UNREACHABLE();
case LookupIterator::JSPROXY:
return;
case LookupIterator::INTERCEPTOR: {
// If there is a getter, return; otherwise loop to perform the lookup.
Handle<JSObject> holder = it->GetHolder<JSObject>();
if (!holder->GetNamedInterceptor()->getter()->IsUndefined()) {
return;
}
break;
}
case LookupIterator::ACCESS_CHECK:
// PropertyHandlerCompiler::CheckPrototypes() knows how to emit
// access checks for global proxies.
if (it->GetHolder<JSObject>()->IsJSGlobalProxy() &&
it->HasAccess(v8::ACCESS_GET)) {
break;
}
return;
case LookupIterator::ACCESSOR:
case LookupIterator::DATA:
return;
}
}
}
bool IC::TryRemoveInvalidPrototypeDependentStub(Handle<Object> receiver,
Handle<String> name) {
if (!IsNameCompatibleWithPrototypeFailure(name)) return false;
Handle<Map> receiver_map = TypeToMap(*receiver_type(), isolate());
maybe_handler_ = target()->FindHandlerForMap(*receiver_map);
// The current map wasn't handled yet. There's no reason to stay monomorphic,
// *unless* we're moving from a deprecated map to its replacement, or
// to a more general elements kind.
// TODO(verwaest): Check if the current map is actually what the old map
// would transition to.
if (maybe_handler_.is_null()) {
if (!receiver_map->IsJSObjectMap()) return false;
Map* first_map = FirstTargetMap();
if (first_map == NULL) return false;
Handle<Map> old_map(first_map);
if (old_map->is_deprecated()) return true;
if (IsMoreGeneralElementsKindTransition(old_map->elements_kind(),
receiver_map->elements_kind())) {
return true;
}
return false;
}
CacheHolderFlag flag;
Handle<Map> ic_holder_map(
GetICCacheHolder(*receiver_type(), isolate(), &flag));
DCHECK(flag != kCacheOnReceiver || receiver->IsJSObject());
DCHECK(flag != kCacheOnPrototype || !receiver->IsJSReceiver());
DCHECK(flag != kCacheOnPrototypeReceiverIsDictionary);
if (state() == MONOMORPHIC) {
int index = ic_holder_map->IndexInCodeCache(*name, *target());
if (index >= 0) {
ic_holder_map->RemoveFromCodeCache(*name, *target(), index);
}
}
if (receiver->IsGlobalObject()) {
Handle<GlobalObject> global = Handle<GlobalObject>::cast(receiver);
LookupIterator it(global, name, LookupIterator::OWN_SKIP_INTERCEPTOR);
if (it.state() == LookupIterator::ACCESS_CHECK) return false;
if (!it.IsFound()) return false;
Handle<PropertyCell> cell = it.GetPropertyCell();
return cell->type()->IsConstant();
}
return true;
}
bool IC::IsNameCompatibleWithPrototypeFailure(Handle<Object> name) {
if (target()->is_keyed_stub()) {
// Determine whether the failure is due to a name failure.
if (!name->IsName()) return false;
Name* stub_name = target()->FindFirstName();
if (*name != stub_name) return false;
}
return true;
}
void IC::UpdateState(Handle<Object> receiver, Handle<Object> name) {
update_receiver_type(receiver);
if (!name->IsString()) return;
if (state() != MONOMORPHIC && state() != POLYMORPHIC) return;
if (receiver->IsUndefined() || receiver->IsNull()) return;
// Remove the target from the code cache if it became invalid
// because of changes in the prototype chain to avoid hitting it
// again.
if (TryRemoveInvalidPrototypeDependentStub(receiver,
Handle<String>::cast(name))) {
MarkPrototypeFailure(name);
return;
}
// The builtins object is special. It only changes when JavaScript
// builtins are loaded lazily. It is important to keep inline
// caches for the builtins object monomorphic. Therefore, if we get
// an inline cache miss for the builtins object after lazily loading
// JavaScript builtins, we return uninitialized as the state to
// force the inline cache back to monomorphic state.
if (receiver->IsJSBuiltinsObject()) state_ = UNINITIALIZED;
}
MaybeHandle<Object> IC::TypeError(const char* type, Handle<Object> object,
Handle<Object> key) {
HandleScope scope(isolate());
Handle<Object> args[2] = {key, object};
THROW_NEW_ERROR(isolate(), NewTypeError(type, HandleVector(args, 2)), Object);
}
MaybeHandle<Object> IC::ReferenceError(const char* type, Handle<Name> name) {
HandleScope scope(isolate());
THROW_NEW_ERROR(isolate(), NewReferenceError(type, HandleVector(&name, 1)),
Object);
}
static void ComputeTypeInfoCountDelta(IC::State old_state, IC::State new_state,
int* polymorphic_delta,
int* generic_delta) {
switch (old_state) {
case UNINITIALIZED:
case PREMONOMORPHIC:
if (new_state == UNINITIALIZED || new_state == PREMONOMORPHIC) break;
if (new_state == MONOMORPHIC || new_state == POLYMORPHIC) {
*polymorphic_delta = 1;
} else if (new_state == MEGAMORPHIC || new_state == GENERIC) {
*generic_delta = 1;
}
break;
case MONOMORPHIC:
case POLYMORPHIC:
if (new_state == MONOMORPHIC || new_state == POLYMORPHIC) break;
*polymorphic_delta = -1;
if (new_state == MEGAMORPHIC || new_state == GENERIC) {
*generic_delta = 1;
}
break;
case MEGAMORPHIC:
case GENERIC:
if (new_state == MEGAMORPHIC || new_state == GENERIC) break;
*generic_delta = -1;
if (new_state == MONOMORPHIC || new_state == POLYMORPHIC) {
*polymorphic_delta = 1;
}
break;
case PROTOTYPE_FAILURE:
case DEBUG_STUB:
case DEFAULT:
UNREACHABLE();
}
}
void IC::OnTypeFeedbackChanged(Isolate* isolate, Address address,
State old_state, State new_state,
bool target_remains_ic_stub) {
Code* host =
isolate->inner_pointer_to_code_cache()->GetCacheEntry(address)->code;
if (host->kind() != Code::FUNCTION) return;
if (FLAG_type_info_threshold > 0 && target_remains_ic_stub &&
// Not all Code objects have TypeFeedbackInfo.
host->type_feedback_info()->IsTypeFeedbackInfo()) {
int polymorphic_delta = 0; // "Polymorphic" here includes monomorphic.
int generic_delta = 0; // "Generic" here includes megamorphic.
ComputeTypeInfoCountDelta(old_state, new_state, &polymorphic_delta,
&generic_delta);
TypeFeedbackInfo* info = TypeFeedbackInfo::cast(host->type_feedback_info());
info->change_ic_with_type_info_count(polymorphic_delta);
info->change_ic_generic_count(generic_delta);
}
if (host->type_feedback_info()->IsTypeFeedbackInfo()) {
TypeFeedbackInfo* info = TypeFeedbackInfo::cast(host->type_feedback_info());
info->change_own_type_change_checksum();
}
host->set_profiler_ticks(0);
isolate->runtime_profiler()->NotifyICChanged();
// TODO(2029): When an optimized function is patched, it would
// be nice to propagate the corresponding type information to its
// unoptimized version for the benefit of later inlining.
}
void IC::PostPatching(Address address, Code* target, Code* old_target) {
// Type vector based ICs update these statistics at a different time because
// they don't always patch on state change.
if (target->kind() == Code::CALL_IC) return;
Isolate* isolate = target->GetHeap()->isolate();
State old_state = UNINITIALIZED;
State new_state = UNINITIALIZED;
bool target_remains_ic_stub = false;
if (old_target->is_inline_cache_stub() && target->is_inline_cache_stub()) {
old_state = old_target->ic_state();
new_state = target->ic_state();
target_remains_ic_stub = true;
}
OnTypeFeedbackChanged(isolate, address, old_state, new_state,
target_remains_ic_stub);
}
void IC::RegisterWeakMapDependency(Handle<Code> stub) {
if (FLAG_collect_maps && FLAG_weak_embedded_maps_in_ic &&
stub->CanBeWeakStub()) {
DCHECK(!stub->is_weak_stub());
MapHandleList maps;
stub->FindAllMaps(&maps);
if (maps.length() == 1 && stub->IsWeakObjectInIC(*maps.at(0))) {
Map::AddDependentIC(maps.at(0), stub);
stub->mark_as_weak_stub();
if (FLAG_enable_ool_constant_pool) {
stub->constant_pool()->set_weak_object_state(
ConstantPoolArray::WEAK_OBJECTS_IN_IC);
}
}
}
}
void IC::InvalidateMaps(Code* stub) {
DCHECK(stub->is_weak_stub());
stub->mark_as_invalidated_weak_stub();
Isolate* isolate = stub->GetIsolate();
Heap* heap = isolate->heap();
Object* undefined = heap->undefined_value();
int mode_mask = RelocInfo::ModeMask(RelocInfo::EMBEDDED_OBJECT);
for (RelocIterator it(stub, mode_mask); !it.done(); it.next()) {
RelocInfo::Mode mode = it.rinfo()->rmode();
if (mode == RelocInfo::EMBEDDED_OBJECT &&
it.rinfo()->target_object()->IsMap()) {
it.rinfo()->set_target_object(undefined, SKIP_WRITE_BARRIER);
}
}
CpuFeatures::FlushICache(stub->instruction_start(), stub->instruction_size());
}
void IC::Clear(Isolate* isolate, Address address,
ConstantPoolArray* constant_pool) {
Code* target = GetTargetAtAddress(address, constant_pool);
// Don't clear debug break inline cache as it will remove the break point.
if (target->is_debug_stub()) return;
switch (target->kind()) {
case Code::LOAD_IC:
return LoadIC::Clear(isolate, address, target, constant_pool);
case Code::KEYED_LOAD_IC:
return KeyedLoadIC::Clear(isolate, address, target, constant_pool);
case Code::STORE_IC:
return StoreIC::Clear(isolate, address, target, constant_pool);
case Code::KEYED_STORE_IC:
return KeyedStoreIC::Clear(isolate, address, target, constant_pool);
case Code::CALL_IC:
return CallIC::Clear(isolate, address, target, constant_pool);
case Code::COMPARE_IC:
return CompareIC::Clear(isolate, address, target, constant_pool);
case Code::COMPARE_NIL_IC:
return CompareNilIC::Clear(address, target, constant_pool);
case Code::BINARY_OP_IC:
case Code::TO_BOOLEAN_IC:
// Clearing these is tricky and does not
// make any performance difference.
return;
default:
UNREACHABLE();
}
}
void KeyedLoadIC::Clear(Isolate* isolate, Address address, Code* target,
ConstantPoolArray* constant_pool) {
if (IsCleared(target)) return;
// Make sure to also clear the map used in inline fast cases. If we
// do not clear these maps, cached code can keep objects alive
// through the embedded maps.
SetTargetAtAddress(address, *pre_monomorphic_stub(isolate), constant_pool);
}
void CallIC::Clear(Isolate* isolate, Address address, Code* target,
ConstantPoolArray* constant_pool) {
// Currently, CallIC doesn't have state changes.
}
void LoadIC::Clear(Isolate* isolate, Address address, Code* target,
ConstantPoolArray* constant_pool) {
if (IsCleared(target)) return;
Code* code = PropertyICCompiler::FindPreMonomorphic(isolate, Code::LOAD_IC,
target->extra_ic_state());
SetTargetAtAddress(address, code, constant_pool);
}
void StoreIC::Clear(Isolate* isolate, Address address, Code* target,
ConstantPoolArray* constant_pool) {
if (IsCleared(target)) return;
Code* code = PropertyICCompiler::FindPreMonomorphic(isolate, Code::STORE_IC,
target->extra_ic_state());
SetTargetAtAddress(address, code, constant_pool);
}
void KeyedStoreIC::Clear(Isolate* isolate, Address address, Code* target,
ConstantPoolArray* constant_pool) {
if (IsCleared(target)) return;
SetTargetAtAddress(
address, *pre_monomorphic_stub(
isolate, StoreIC::GetStrictMode(target->extra_ic_state())),
constant_pool);
}
void CompareIC::Clear(Isolate* isolate, Address address, Code* target,
ConstantPoolArray* constant_pool) {
DCHECK(CodeStub::GetMajorKey(target) == CodeStub::CompareIC);
CompareICStub stub(target->stub_key(), isolate);
// Only clear CompareICs that can retain objects.
if (stub.state() != CompareICState::KNOWN_OBJECT) return;
SetTargetAtAddress(address, GetRawUninitialized(isolate, stub.op()),
constant_pool);
PatchInlinedSmiCode(address, DISABLE_INLINED_SMI_CHECK);
}
// static
Handle<Code> KeyedLoadIC::generic_stub(Isolate* isolate) {
if (FLAG_compiled_keyed_generic_loads) {
return KeyedLoadGenericStub(isolate).GetCode();
} else {
return isolate->builtins()->KeyedLoadIC_Generic();
}
}
static bool MigrateDeprecated(Handle<Object> object) {
if (!object->IsJSObject()) return false;
Handle<JSObject> receiver = Handle<JSObject>::cast(object);
if (!receiver->map()->is_deprecated()) return false;
JSObject::MigrateInstance(Handle<JSObject>::cast(object));
return true;
}
MaybeHandle<Object> LoadIC::Load(Handle<Object> object, Handle<Name> name) {
// If the object is undefined or null it's illegal to try to get any
// of its properties; throw a TypeError in that case.
if (object->IsUndefined() || object->IsNull()) {
return TypeError("non_object_property_load", object, name);
}
// Check if the name is trivially convertible to an index and get
// the element or char if so.
uint32_t index;
if (kind() == Code::KEYED_LOAD_IC && name->AsArrayIndex(&index)) {
// Rewrite to the generic keyed load stub.
if (FLAG_use_ic) {
set_target(*KeyedLoadIC::generic_stub(isolate()));
TRACE_IC("LoadIC", name);
TRACE_GENERIC_IC(isolate(), "LoadIC", "name as array index");
}
Handle<Object> result;
ASSIGN_RETURN_ON_EXCEPTION(
isolate(), result,
Runtime::GetElementOrCharAt(isolate(), object, index), Object);
return result;
}
bool use_ic = MigrateDeprecated(object) ? false : FLAG_use_ic;
// Named lookup in the object.
LookupIterator it(object, name);
LookupForRead(&it);
if (it.IsFound() || !IsUndeclaredGlobal(object)) {
// Update inline cache and stub cache.
if (use_ic) UpdateCaches(&it);
// Get the property.
Handle<Object> result;
ASSIGN_RETURN_ON_EXCEPTION(isolate(), result, Object::GetProperty(&it),
Object);
if (it.IsFound()) {
return result;
} else if (!IsUndeclaredGlobal(object)) {
LOG(isolate(), SuspectReadEvent(*name, *object));
return result;
}
}
return ReferenceError("not_defined", name);
}
static bool AddOneReceiverMapIfMissing(MapHandleList* receiver_maps,
Handle<Map> new_receiver_map) {
DCHECK(!new_receiver_map.is_null());
for (int current = 0; current < receiver_maps->length(); ++current) {
if (!receiver_maps->at(current).is_null() &&
receiver_maps->at(current).is_identical_to(new_receiver_map)) {
return false;
}
}
receiver_maps->Add(new_receiver_map);
return true;
}
bool IC::UpdatePolymorphicIC(Handle<Name> name, Handle<Code> code) {
if (!code->is_handler()) return false;
if (target()->is_keyed_stub() && state() != PROTOTYPE_FAILURE) return false;
Handle<HeapType> type = receiver_type();
TypeHandleList types;
CodeHandleList handlers;
TargetTypes(&types);
int number_of_types = types.length();
int deprecated_types = 0;
int handler_to_overwrite = -1;
for (int i = 0; i < number_of_types; i++) {
Handle<HeapType> current_type = types.at(i);
if (current_type->IsClass() &&
current_type->AsClass()->Map()->is_deprecated()) {
// Filter out deprecated maps to ensure their instances get migrated.
++deprecated_types;
} else if (type->NowIs(current_type)) {
// If the receiver type is already in the polymorphic IC, this indicates
// there was a prototoype chain failure. In that case, just overwrite the
// handler.
handler_to_overwrite = i;
} else if (handler_to_overwrite == -1 && current_type->IsClass() &&
type->IsClass() &&
IsTransitionOfMonomorphicTarget(*current_type->AsClass()->Map(),
*type->AsClass()->Map())) {
handler_to_overwrite = i;
}
}
int number_of_valid_types =
number_of_types - deprecated_types - (handler_to_overwrite != -1);
if (number_of_valid_types >= 4) return false;
if (number_of_types == 0) return false;
if (!target()->FindHandlers(&handlers, types.length())) return false;
number_of_valid_types++;
if (number_of_valid_types > 1 && target()->is_keyed_stub()) return false;
Handle<Code> ic;
if (number_of_valid_types == 1) {
ic = PropertyICCompiler::ComputeMonomorphic(kind(), name, type, code,
extra_ic_state());
} else {
if (handler_to_overwrite >= 0) {
handlers.Set(handler_to_overwrite, code);
if (!type->NowIs(types.at(handler_to_overwrite))) {
types.Set(handler_to_overwrite, type);
}
} else {
types.Add(type);
handlers.Add(code);
}
ic = PropertyICCompiler::ComputePolymorphic(kind(), &types, &handlers,
number_of_valid_types, name,
extra_ic_state());
}
set_target(*ic);
return true;
}
Handle<HeapType> IC::CurrentTypeOf(Handle<Object> object, Isolate* isolate) {
return object->IsJSGlobalObject()
? HeapType::Constant(Handle<JSGlobalObject>::cast(object), isolate)
: HeapType::NowOf(object, isolate);
}
Handle<Map> IC::TypeToMap(HeapType* type, Isolate* isolate) {
if (type->Is(HeapType::Number()))
return isolate->factory()->heap_number_map();
if (type->Is(HeapType::Boolean())) return isolate->factory()->boolean_map();
if (type->IsConstant()) {
return handle(
Handle<JSGlobalObject>::cast(type->AsConstant()->Value())->map());
}
DCHECK(type->IsClass());
return type->AsClass()->Map();
}
template <class T>
typename T::TypeHandle IC::MapToType(Handle<Map> map,
typename T::Region* region) {
if (map->instance_type() == HEAP_NUMBER_TYPE) {
return T::Number(region);
} else if (map->instance_type() == ODDBALL_TYPE) {
// The only oddballs that can be recorded in ICs are booleans.
return T::Boolean(region);
} else {
return T::Class(map, region);
}
}
template Type* IC::MapToType<Type>(Handle<Map> map, Zone* zone);
template Handle<HeapType> IC::MapToType<HeapType>(Handle<Map> map,
Isolate* region);
void IC::UpdateMonomorphicIC(Handle<Code> handler, Handle<Name> name) {
DCHECK(handler->is_handler());
Handle<Code> ic = PropertyICCompiler::ComputeMonomorphic(
kind(), name, receiver_type(), handler, extra_ic_state());
set_target(*ic);
}
void IC::CopyICToMegamorphicCache(Handle<Name> name) {
TypeHandleList types;
CodeHandleList handlers;
TargetTypes(&types);
if (!target()->FindHandlers(&handlers, types.length())) return;
for (int i = 0; i < types.length(); i++) {
UpdateMegamorphicCache(*types.at(i), *name, *handlers.at(i));
}
}
bool IC::IsTransitionOfMonomorphicTarget(Map* source_map, Map* target_map) {
if (source_map == NULL) return true;
if (target_map == NULL) return false;
ElementsKind target_elements_kind = target_map->elements_kind();
bool more_general_transition = IsMoreGeneralElementsKindTransition(
source_map->elements_kind(), target_elements_kind);
Map* transitioned_map =
more_general_transition
? source_map->LookupElementsTransitionMap(target_elements_kind)
: NULL;
return transitioned_map == target_map;
}
void IC::PatchCache(Handle<Name> name, Handle<Code> code) {
switch (state()) {
case UNINITIALIZED:
case PREMONOMORPHIC:
UpdateMonomorphicIC(code, name);
break;
case PROTOTYPE_FAILURE:
case MONOMORPHIC:
case POLYMORPHIC:
if (!target()->is_keyed_stub() || state() == PROTOTYPE_FAILURE) {
if (UpdatePolymorphicIC(name, code)) break;
CopyICToMegamorphicCache(name);
}
set_target(*megamorphic_stub());
// Fall through.
case MEGAMORPHIC:
UpdateMegamorphicCache(*receiver_type(), *name, *code);
break;
case DEBUG_STUB:
break;
case DEFAULT:
case GENERIC:
UNREACHABLE();
break;
}
}
Handle<Code> LoadIC::initialize_stub(Isolate* isolate,
ExtraICState extra_state) {
return PropertyICCompiler::ComputeLoad(isolate, UNINITIALIZED, extra_state);
}
Handle<Code> LoadIC::megamorphic_stub() {
if (kind() == Code::LOAD_IC) {
MegamorphicLoadStub stub(isolate(), LoadICState(extra_ic_state()));
return stub.GetCode();
} else {
DCHECK_EQ(Code::KEYED_LOAD_IC, kind());
return KeyedLoadIC::generic_stub(isolate());
}
}
Handle<Code> LoadIC::pre_monomorphic_stub(Isolate* isolate,
ExtraICState extra_state) {
return PropertyICCompiler::ComputeLoad(isolate, PREMONOMORPHIC, extra_state);
}
Handle<Code> KeyedLoadIC::pre_monomorphic_stub(Isolate* isolate) {
return isolate->builtins()->KeyedLoadIC_PreMonomorphic();
}
Handle<Code> LoadIC::pre_monomorphic_stub() const {
if (kind() == Code::LOAD_IC) {
return LoadIC::pre_monomorphic_stub(isolate(), extra_ic_state());
} else {
DCHECK_EQ(Code::KEYED_LOAD_IC, kind());
return KeyedLoadIC::pre_monomorphic_stub(isolate());
}
}
Handle<Code> LoadIC::SimpleFieldLoad(FieldIndex index) {
LoadFieldStub stub(isolate(), index);
return stub.GetCode();
}
void LoadIC::UpdateCaches(LookupIterator* lookup) {
if (state() == UNINITIALIZED) {
// This is the first time we execute this inline cache. Set the target to
// the pre monomorphic stub to delay setting the monomorphic state.
set_target(*pre_monomorphic_stub());
TRACE_IC("LoadIC", lookup->name());
return;
}
Handle<Code> code;
if (lookup->state() == LookupIterator::JSPROXY ||
lookup->state() == LookupIterator::ACCESS_CHECK) {
code = slow_stub();
} else if (!lookup->IsFound()) {
if (kind() == Code::LOAD_IC) {
code = NamedLoadHandlerCompiler::ComputeLoadNonexistent(lookup->name(),
receiver_type());
// TODO(jkummerow/verwaest): Introduce a builtin that handles this case.
if (code.is_null()) code = slow_stub();
} else {
code = slow_stub();
}
} else {
code = ComputeHandler(lookup);
}
PatchCache(lookup->name(), code);
TRACE_IC("LoadIC", lookup->name());
}
void IC::UpdateMegamorphicCache(HeapType* type, Name* name, Code* code) {
if (kind() == Code::KEYED_LOAD_IC || kind() == Code::KEYED_STORE_IC) return;
Map* map = *TypeToMap(type, isolate());
isolate()->stub_cache()->Set(name, map, code);
}
Handle<Code> IC::ComputeHandler(LookupIterator* lookup, Handle<Object> value) {
bool receiver_is_holder =
lookup->GetReceiver().is_identical_to(lookup->GetHolder<JSObject>());
CacheHolderFlag flag;
Handle<Map> stub_holder_map = IC::GetHandlerCacheHolder(
*receiver_type(), receiver_is_holder, isolate(), &flag);
Handle<Code> code = PropertyHandlerCompiler::Find(
lookup->name(), stub_holder_map, kind(), flag,
lookup->is_dictionary_holder() ? Code::NORMAL : Code::FAST);
// Use the cached value if it exists, and if it is different from the
// handler that just missed.
if (!code.is_null()) {
if (!maybe_handler_.is_null() &&
!maybe_handler_.ToHandleChecked().is_identical_to(code)) {
return code;
}
if (maybe_handler_.is_null()) {
// maybe_handler_ is only populated for MONOMORPHIC and POLYMORPHIC ICs.
// In MEGAMORPHIC case, check if the handler in the megamorphic stub
// cache (which just missed) is different from the cached handler.
if (state() == MEGAMORPHIC && lookup->GetReceiver()->IsHeapObject()) {
Map* map = Handle<HeapObject>::cast(lookup->GetReceiver())->map();
Code* megamorphic_cached_code =
isolate()->stub_cache()->Get(*lookup->name(), map, code->flags());
if (megamorphic_cached_code != *code) return code;
} else {
return code;
}
}
}
code = CompileHandler(lookup, value, flag);
DCHECK(code->is_handler());
// TODO(mvstanton): we'd only like to cache code on the map when it's custom
// code compiled for this map, otherwise it's already cached in the global
// code
// cache. We are also guarding against installing code with flags that don't
// match the desired CacheHolderFlag computed above, which would lead to
// invalid lookups later.
if (code->type() != Code::NORMAL &&
Code::ExtractCacheHolderFromFlags(code->flags()) == flag) {
Map::UpdateCodeCache(stub_holder_map, lookup->name(), code);
}
return code;
}
Handle<Code> LoadIC::CompileHandler(LookupIterator* lookup,
Handle<Object> unused,
CacheHolderFlag cache_holder) {
Handle<Object> receiver = lookup->GetReceiver();
if (receiver->IsString() &&
Name::Equals(isolate()->factory()->length_string(), lookup->name())) {
FieldIndex index = FieldIndex::ForInObjectOffset(String::kLengthOffset);
return SimpleFieldLoad(index);
}
if (receiver->IsStringWrapper() &&
Name::Equals(isolate()->factory()->length_string(), lookup->name())) {
StringLengthStub string_length_stub(isolate());
return string_length_stub.GetCode();
}
// Use specialized code for getting prototype of functions.
if (receiver->IsJSFunction() &&
Name::Equals(isolate()->factory()->prototype_string(), lookup->name()) &&
Handle<JSFunction>::cast(receiver)->should_have_prototype() &&
!Handle<JSFunction>::cast(receiver)
->map()
->has_non_instance_prototype()) {
Handle<Code> stub;
FunctionPrototypeStub function_prototype_stub(isolate());
return function_prototype_stub.GetCode();
}
Handle<HeapType> type = receiver_type();
Handle<JSObject> holder = lookup->GetHolder<JSObject>();
bool receiver_is_holder = receiver.is_identical_to(holder);
switch (lookup->state()) {
case LookupIterator::INTERCEPTOR: {
DCHECK(!holder->GetNamedInterceptor()->getter()->IsUndefined());
NamedLoadHandlerCompiler compiler(isolate(), receiver_type(), holder,
cache_holder);
// Perform a lookup behind the interceptor. Copy the LookupIterator since
// the original iterator will be used to fetch the value.
LookupIterator it = *lookup;
it.Next();
LookupForRead(&it);
return compiler.CompileLoadInterceptor(&it);
}
case LookupIterator::ACCESSOR: {
// Use simple field loads for some well-known callback properties.
if (receiver_is_holder) {
DCHECK(receiver->IsJSObject());
Handle<JSObject> js_receiver = Handle<JSObject>::cast(receiver);
int object_offset;
if (Accessors::IsJSObjectFieldAccessor<HeapType>(type, lookup->name(),
&object_offset)) {
FieldIndex index =
FieldIndex::ForInObjectOffset(object_offset, js_receiver->map());
return SimpleFieldLoad(index);
}
}
Handle<Object> accessors = lookup->GetAccessors();
if (accessors->IsExecutableAccessorInfo()) {
Handle<ExecutableAccessorInfo> info =
Handle<ExecutableAccessorInfo>::cast(accessors);
if (v8::ToCData<Address>(info->getter()) == 0) break;
if (!ExecutableAccessorInfo::IsCompatibleReceiverType(isolate(), info,
type)) {
break;
}
if (!holder->HasFastProperties()) break;
NamedLoadHandlerCompiler compiler(isolate(), receiver_type(), holder,
cache_holder);
return compiler.CompileLoadCallback(lookup->name(), info);
}
if (accessors->IsAccessorPair()) {
Handle<Object> getter(Handle<AccessorPair>::cast(accessors)->getter(),
isolate());
if (!getter->IsJSFunction()) break;
if (!holder->HasFastProperties()) break;
Handle<JSFunction> function = Handle<JSFunction>::cast(getter);
if (!receiver->IsJSObject() && !function->IsBuiltin() &&
function->shared()->strict_mode() == SLOPPY) {
// Calling sloppy non-builtins with a value as the receiver
// requires boxing.
break;
}
CallOptimization call_optimization(function);
NamedLoadHandlerCompiler compiler(isolate(), receiver_type(), holder,
cache_holder);
if (call_optimization.is_simple_api_call() &&
call_optimization.IsCompatibleReceiver(receiver, holder)) {
return compiler.CompileLoadCallback(lookup->name(),
call_optimization);
}
return compiler.CompileLoadViaGetter(lookup->name(), function);
}
// TODO(dcarney): Handle correctly.
DCHECK(accessors->IsDeclaredAccessorInfo());
break;
}
case LookupIterator::DATA: {
if (lookup->is_dictionary_holder()) {
if (kind() != Code::LOAD_IC) break;
if (holder->IsGlobalObject()) {
NamedLoadHandlerCompiler compiler(isolate(), receiver_type(), holder,
cache_holder);
Handle<PropertyCell> cell = lookup->GetPropertyCell();
Handle<Code> code = compiler.CompileLoadGlobal(
cell, lookup->name(), lookup->IsConfigurable());
// TODO(verwaest): Move caching of these NORMAL stubs outside as well.
CacheHolderFlag flag;
Handle<Map> stub_holder_map = GetHandlerCacheHolder(
*type, receiver_is_holder, isolate(), &flag);
Map::UpdateCodeCache(stub_holder_map, lookup->name(), code);
return code;
}
// There is only one shared stub for loading normalized
// properties. It does not traverse the prototype chain, so the
// property must be found in the object for the stub to be
// applicable.
if (!receiver_is_holder) break;
return isolate()->builtins()->LoadIC_Normal();
}
// -------------- Fields --------------
if (lookup->property_details().type() == FIELD) {
FieldIndex field = lookup->GetFieldIndex();
if (receiver_is_holder) {
return SimpleFieldLoad(field);
}
NamedLoadHandlerCompiler compiler(isolate(), receiver_type(), holder,
cache_holder);
return compiler.CompileLoadField(lookup->name(), field);
}
// -------------- Constant properties --------------
DCHECK(lookup->property_details().type() == CONSTANT);
if (receiver_is_holder) {
LoadConstantStub stub(isolate(), lookup->GetConstantIndex());
return stub.GetCode();
}
NamedLoadHandlerCompiler compiler(isolate(), receiver_type(), holder,
cache_holder);
return compiler.CompileLoadConstant(lookup->name(),
lookup->GetConstantIndex());
}
case LookupIterator::ACCESS_CHECK:
case LookupIterator::JSPROXY:
case LookupIterator::NOT_FOUND:
case LookupIterator::TRANSITION:
UNREACHABLE();
}
return slow_stub();
}
static Handle<Object> TryConvertKey(Handle<Object> key, Isolate* isolate) {
// This helper implements a few common fast cases for converting
// non-smi keys of keyed loads/stores to a smi or a string.
if (key->IsHeapNumber()) {
double value = Handle<HeapNumber>::cast(key)->value();
if (std::isnan(value)) {
key = isolate->factory()->nan_string();
} else {
int int_value = FastD2I(value);
if (value == int_value && Smi::IsValid(int_value)) {
key = Handle<Smi>(Smi::FromInt(int_value), isolate);
}
}
} else if (key->IsUndefined()) {
key = isolate->factory()->undefined_string();
}
return key;
}
Handle<Code> KeyedLoadIC::LoadElementStub(Handle<JSObject> receiver) {
Handle<Map> receiver_map(receiver->map(), isolate());
MapHandleList target_receiver_maps;
if (target().is_identical_to(string_stub())) {
target_receiver_maps.Add(isolate()->factory()->string_map());
} else {
TargetMaps(&target_receiver_maps);
}
if (target_receiver_maps.length() == 0) {
return PropertyICCompiler::ComputeKeyedLoadMonomorphic(receiver_map);
}
// The first time a receiver is seen that is a transitioned version of the
// previous monomorphic receiver type, assume the new ElementsKind is the
// monomorphic type. This benefits global arrays that only transition
// once, and all call sites accessing them are faster if they remain
// monomorphic. If this optimistic assumption is not true, the IC will
// miss again and it will become polymorphic and support both the
// untransitioned and transitioned maps.
if (state() == MONOMORPHIC && IsMoreGeneralElementsKindTransition(
target_receiver_maps.at(0)->elements_kind(),
receiver->GetElementsKind())) {
return PropertyICCompiler::ComputeKeyedLoadMonomorphic(receiver_map);
}
DCHECK(state() != GENERIC);
// Determine the list of receiver maps that this call site has seen,
// adding the map that was just encountered.
if (!AddOneReceiverMapIfMissing(&target_receiver_maps, receiver_map)) {
// If the miss wasn't due to an unseen map, a polymorphic stub
// won't help, use the generic stub.
TRACE_GENERIC_IC(isolate(), "KeyedLoadIC", "same map added twice");
return generic_stub();
}
// If the maximum number of receiver maps has been exceeded, use the generic
// version of the IC.
if (target_receiver_maps.length() > kMaxKeyedPolymorphism) {
TRACE_GENERIC_IC(isolate(), "KeyedLoadIC", "max polymorph exceeded");
return generic_stub();
}
return PropertyICCompiler::ComputeKeyedLoadPolymorphic(&target_receiver_maps);
}
MaybeHandle<Object> KeyedLoadIC::Load(Handle<Object> object,
Handle<Object> key) {
if (MigrateDeprecated(object)) {
Handle<Object> result;
ASSIGN_RETURN_ON_EXCEPTION(
isolate(), result, Runtime::GetObjectProperty(isolate(), object, key),
Object);
return result;
}
Handle<Object> load_handle;
Handle<Code> stub = generic_stub();
// Check for non-string values that can be converted into an
// internalized string directly or is representable as a smi.
key = TryConvertKey(key, isolate());
if (key->IsInternalizedString() || key->IsSymbol()) {
ASSIGN_RETURN_ON_EXCEPTION(isolate(), load_handle,
LoadIC::Load(object, Handle<Name>::cast(key)),
Object);
} else if (FLAG_use_ic && !object->IsAccessCheckNeeded()) {
if (object->IsString() && key->IsNumber()) {
if (state() == UNINITIALIZED) stub = string_stub();
} else if (object->IsJSObject()) {
Handle<JSObject> receiver = Handle<JSObject>::cast(object);
if (!Object::ToSmi(isolate(), key).is_null()) {
stub = LoadElementStub(receiver);
}
}
}
if (!is_target_set()) {
Code* generic = *generic_stub();
if (*stub == generic) {
TRACE_GENERIC_IC(isolate(), "KeyedLoadIC", "set generic");
}
set_target(*stub);
TRACE_IC("LoadIC", key);
}
if (!load_handle.is_null()) return load_handle;
Handle<Object> result;
ASSIGN_RETURN_ON_EXCEPTION(isolate(), result,
Runtime::GetObjectProperty(isolate(), object, key),
Object);
return result;
}
bool StoreIC::LookupForWrite(LookupIterator* it, Handle<Object> value,
JSReceiver::StoreFromKeyed store_mode) {
// Disable ICs for non-JSObjects for now.
Handle<Object> receiver = it->GetReceiver();
if (!receiver->IsJSObject()) return false;
DCHECK(!Handle<JSObject>::cast(receiver)->map()->is_deprecated());
for (; it->IsFound(); it->Next()) {
switch (it->state()) {
case LookupIterator::NOT_FOUND:
case LookupIterator::TRANSITION:
UNREACHABLE();
case LookupIterator::JSPROXY:
return false;
case LookupIterator::INTERCEPTOR: {
Handle<JSObject> holder = it->GetHolder<JSObject>();
InterceptorInfo* info = holder->GetNamedInterceptor();
if (it->HolderIsReceiverOrHiddenPrototype()) {
if (!info->setter()->IsUndefined()) return true;
} else if (!info->getter()->IsUndefined() ||
!info->query()->IsUndefined()) {
return false;
}
break;
}
case LookupIterator::ACCESS_CHECK:
if (it->GetHolder<JSObject>()->IsAccessCheckNeeded()) return false;
break;
case LookupIterator::ACCESSOR:
return !it->IsReadOnly();
case LookupIterator::DATA: {
if (it->IsReadOnly()) return false;
Handle<JSObject> holder = it->GetHolder<JSObject>();
if (receiver.is_identical_to(holder)) {
it->PrepareForDataProperty(value);
// The previous receiver map might just have been deprecated,
// so reload it.
update_receiver_type(receiver);
return true;
}
// Receiver != holder.
PrototypeIterator iter(it->isolate(), receiver);
if (receiver->IsJSGlobalProxy()) {
return it->GetHolder<Object>().is_identical_to(
PrototypeIterator::GetCurrent(iter));
}
it->PrepareTransitionToDataProperty(value, NONE, store_mode);
return it->IsCacheableTransition();
}
}
}
it->PrepareTransitionToDataProperty(value, NONE, store_mode);
return it->IsCacheableTransition();
}
MaybeHandle<Object> StoreIC::Store(Handle<Object> object, Handle<Name> name,
Handle<Object> value,
JSReceiver::StoreFromKeyed store_mode) {
// TODO(verwaest): Let SetProperty do the migration, since storing a property
// might deprecate the current map again, if value does not fit.
if (MigrateDeprecated(object) || object->IsJSProxy()) {
Handle<Object> result;
ASSIGN_RETURN_ON_EXCEPTION(
isolate(), result,
Object::SetProperty(object, name, value, strict_mode()), Object);
return result;
}
// If the object is undefined or null it's illegal to try to set any
// properties on it; throw a TypeError in that case.
if (object->IsUndefined() || object->IsNull()) {
return TypeError("non_object_property_store", object, name);
}
// Check if the given name is an array index.
uint32_t index;
if (name->AsArrayIndex(&index)) {
// Ignore other stores where the receiver is not a JSObject.
// TODO(1475): Must check prototype chains of object wrappers.
if (!object->IsJSObject()) return value;
Handle<JSObject> receiver = Handle<JSObject>::cast(object);
Handle<Object> result;
ASSIGN_RETURN_ON_EXCEPTION(
isolate(), result,
JSObject::SetElement(receiver, index, value, NONE, strict_mode()),
Object);
return value;
}
// Observed objects are always modified through the runtime.
if (object->IsHeapObject() &&
Handle<HeapObject>::cast(object)->map()->is_observed()) {
Handle<Object> result;
ASSIGN_RETURN_ON_EXCEPTION(
isolate(), result,
Object::SetProperty(object, name, value, strict_mode(), store_mode),
Object);
return result;
}
LookupIterator it(object, name);
if (FLAG_use_ic) UpdateCaches(&it, value, store_mode);
// Set the property.
Handle<Object> result;
ASSIGN_RETURN_ON_EXCEPTION(
isolate(), result,
Object::SetProperty(&it, value, strict_mode(), store_mode), Object);
return result;
}
Handle<Code> CallIC::initialize_stub(Isolate* isolate, int argc,
CallICState::CallType call_type) {
CallICStub stub(isolate, CallICState(argc, call_type));
Handle<Code> code = stub.GetCode();
return code;
}
Handle<Code> StoreIC::initialize_stub(Isolate* isolate,
StrictMode strict_mode) {
ExtraICState extra_state = ComputeExtraICState(strict_mode);
Handle<Code> ic =
PropertyICCompiler::ComputeStore(isolate, UNINITIALIZED, extra_state);
return ic;
}
Handle<Code> StoreIC::megamorphic_stub() {
if (kind() == Code::STORE_IC) {
return PropertyICCompiler::ComputeStore(isolate(), MEGAMORPHIC,
extra_ic_state());
} else {
DCHECK(kind() == Code::KEYED_STORE_IC);
if (strict_mode() == STRICT) {
return isolate()->builtins()->KeyedStoreIC_Generic_Strict();
} else {
return isolate()->builtins()->KeyedStoreIC_Generic();
}
}
}
Handle<Code> StoreIC::generic_stub() const {
if (kind() == Code::STORE_IC) {
return PropertyICCompiler::ComputeStore(isolate(), GENERIC,
extra_ic_state());
} else {
DCHECK(kind() == Code::KEYED_STORE_IC);
if (strict_mode() == STRICT) {
return isolate()->builtins()->KeyedStoreIC_Generic_Strict();
} else {
return isolate()->builtins()->KeyedStoreIC_Generic();
}
}
}
Handle<Code> StoreIC::slow_stub() const {
if (kind() == Code::STORE_IC) {
return isolate()->builtins()->StoreIC_Slow();
} else {
DCHECK(kind() == Code::KEYED_STORE_IC);
return isolate()->builtins()->KeyedStoreIC_Slow();
}
}
Handle<Code> StoreIC::pre_monomorphic_stub(Isolate* isolate,
StrictMode strict_mode) {
ExtraICState state = ComputeExtraICState(strict_mode);
return PropertyICCompiler::ComputeStore(isolate, PREMONOMORPHIC, state);
}
void StoreIC::UpdateCaches(LookupIterator* lookup, Handle<Object> value,
JSReceiver::StoreFromKeyed store_mode) {
if (state() == UNINITIALIZED) {
// This is the first time we execute this inline cache. Set the target to
// the pre monomorphic stub to delay setting the monomorphic state.
set_target(*pre_monomorphic_stub());
TRACE_IC("StoreIC", lookup->name());
return;
}
bool use_ic = LookupForWrite(lookup, value, store_mode);
if (!use_ic) {
TRACE_GENERIC_IC(isolate(), "StoreIC", "LookupForWrite said 'false'");
}
Handle<Code> code = use_ic ? ComputeHandler(lookup, value) : slow_stub();
PatchCache(lookup->name(), code);
TRACE_IC("StoreIC", lookup->name());
}
Handle<Code> StoreIC::CompileHandler(LookupIterator* lookup,
Handle<Object> value,
CacheHolderFlag cache_holder) {
DCHECK_NE(LookupIterator::JSPROXY, lookup->state());
// This is currently guaranteed by checks in StoreIC::Store.
Handle<JSObject> receiver = Handle<JSObject>::cast(lookup->GetReceiver());
Handle<JSObject> holder = lookup->GetHolder<JSObject>();
DCHECK(!receiver->IsAccessCheckNeeded());
switch (lookup->state()) {
case LookupIterator::TRANSITION: {
Handle<Map> transition = lookup->transition_map();
// Currently not handled by CompileStoreTransition.
if (!holder->HasFastProperties()) {
TRACE_GENERIC_IC(isolate(), "StoreIC", "transition from slow");
break;
}
DCHECK(lookup->IsCacheableTransition());
NamedStoreHandlerCompiler compiler(isolate(), receiver_type(), holder);
return compiler.CompileStoreTransition(transition, lookup->name());
}
case LookupIterator::INTERCEPTOR: {
DCHECK(!holder->GetNamedInterceptor()->setter()->IsUndefined());
NamedStoreHandlerCompiler compiler(isolate(), receiver_type(), holder);
return compiler.CompileStoreInterceptor(lookup->name());
}
case LookupIterator::ACCESSOR: {
if (!holder->HasFastProperties()) {
TRACE_GENERIC_IC(isolate(), "StoreIC", "accessor on slow map");
break;
}
Handle<Object> accessors = lookup->GetAccessors();
if (accessors->IsExecutableAccessorInfo()) {
Handle<ExecutableAccessorInfo> info =
Handle<ExecutableAccessorInfo>::cast(accessors);
if (v8::ToCData<Address>(info->setter()) == 0) {
TRACE_GENERIC_IC(isolate(), "StoreIC", "setter == 0");
break;
}
if (!ExecutableAccessorInfo::IsCompatibleReceiverType(
isolate(), info, receiver_type())) {
TRACE_GENERIC_IC(isolate(), "StoreIC", "incompatible receiver type");
break;
}
NamedStoreHandlerCompiler compiler(isolate(), receiver_type(), holder);
return compiler.CompileStoreCallback(receiver, lookup->name(), info);
} else if (accessors->IsAccessorPair()) {
Handle<Object> setter(Handle<AccessorPair>::cast(accessors)->setter(),
isolate());
if (!setter->IsJSFunction()) {
TRACE_GENERIC_IC(isolate(), "StoreIC", "setter not a function");
break;
}
Handle<JSFunction> function = Handle<JSFunction>::cast(setter);
CallOptimization call_optimization(function);
NamedStoreHandlerCompiler compiler(isolate(), receiver_type(), holder);
if (call_optimization.is_simple_api_call() &&
call_optimization.IsCompatibleReceiver(receiver, holder)) {
return compiler.CompileStoreCallback(receiver, lookup->name(),
call_optimization);
}
return compiler.CompileStoreViaSetter(receiver, lookup->name(),
Handle<JSFunction>::cast(setter));
}
// TODO(dcarney): Handle correctly.
DCHECK(accessors->IsDeclaredAccessorInfo());
TRACE_GENERIC_IC(isolate(), "StoreIC", "declared accessor info");
break;
}
case LookupIterator::DATA: {
if (lookup->is_dictionary_holder()) {
if (holder->IsGlobalObject()) {
Handle<PropertyCell> cell = lookup->GetPropertyCell();
Handle<HeapType> union_type = PropertyCell::UpdatedType(cell, value);
StoreGlobalStub stub(isolate(), union_type->IsConstant(),
receiver->IsJSGlobalProxy());
Handle<Code> code = stub.GetCodeCopyFromTemplate(
Handle<GlobalObject>::cast(holder), cell);
// TODO(verwaest): Move caching of these NORMAL stubs outside as well.
HeapObject::UpdateMapCodeCache(receiver, lookup->name(), code);
return code;
}
DCHECK(holder.is_identical_to(receiver));
return isolate()->builtins()->StoreIC_Normal();
}
// -------------- Fields --------------
if (lookup->property_details().type() == FIELD) {
bool use_stub = true;
if (lookup->representation().IsHeapObject()) {
// Only use a generic stub if no types need to be tracked.
Handle<HeapType> field_type = lookup->GetFieldType();
HeapType::Iterator<Map> it = field_type->Classes();
use_stub = it.Done();
}
if (use_stub) {
StoreFieldStub stub(isolate(), lookup->GetFieldIndex(),
lookup->representation());
return stub.GetCode();
}
NamedStoreHandlerCompiler compiler(isolate(), receiver_type(), holder);
return compiler.CompileStoreField(lookup);
}
// -------------- Constant properties --------------
DCHECK(lookup->property_details().type() == CONSTANT);
TRACE_GENERIC_IC(isolate(), "StoreIC", "constant property");
break;
}
case LookupIterator::ACCESS_CHECK:
case LookupIterator::JSPROXY:
case LookupIterator::NOT_FOUND:
UNREACHABLE();
}
return slow_stub();
}
Handle<Code> KeyedStoreIC::StoreElementStub(Handle<JSObject> receiver,
KeyedAccessStoreMode store_mode) {
// Don't handle megamorphic property accesses for INTERCEPTORS or CALLBACKS
// via megamorphic stubs, since they don't have a map in their relocation info
// and so the stubs can't be harvested for the object needed for a map check.
if (target()->type() != Code::NORMAL) {
TRACE_GENERIC_IC(isolate(), "KeyedStoreIC", "non-NORMAL target type");
return generic_stub();
}
Handle<Map> receiver_map(receiver->map(), isolate());
MapHandleList target_receiver_maps;
TargetMaps(&target_receiver_maps);
if (target_receiver_maps.length() == 0) {
Handle<Map> monomorphic_map =
ComputeTransitionedMap(receiver_map, store_mode);
store_mode = GetNonTransitioningStoreMode(store_mode);
return PropertyICCompiler::ComputeKeyedStoreMonomorphic(
monomorphic_map, strict_mode(), store_mode);
}
// There are several special cases where an IC that is MONOMORPHIC can still
// transition to a different GetNonTransitioningStoreMode IC that handles a
// superset of the original IC. Handle those here if the receiver map hasn't
// changed or it has transitioned to a more general kind.
KeyedAccessStoreMode old_store_mode =
KeyedStoreIC::GetKeyedAccessStoreMode(target()->extra_ic_state());
Handle<Map> previous_receiver_map = target_receiver_maps.at(0);
if (state() == MONOMORPHIC) {
Handle<Map> transitioned_receiver_map = receiver_map;
if (IsTransitionStoreMode(store_mode)) {
transitioned_receiver_map =
ComputeTransitionedMap(receiver_map, store_mode);
}
if ((receiver_map.is_identical_to(previous_receiver_map) &&
IsTransitionStoreMode(store_mode)) ||
IsTransitionOfMonomorphicTarget(*previous_receiver_map,
*transitioned_receiver_map)) {
// If the "old" and "new" maps are in the same elements map family, or
// if they at least come from the same origin for a transitioning store,
// stay MONOMORPHIC and use the map for the most generic ElementsKind.
store_mode = GetNonTransitioningStoreMode(store_mode);
return PropertyICCompiler::ComputeKeyedStoreMonomorphic(
transitioned_receiver_map, strict_mode(), store_mode);
} else if (*previous_receiver_map == receiver->map() &&
old_store_mode == STANDARD_STORE &&
(store_mode == STORE_AND_GROW_NO_TRANSITION ||
store_mode == STORE_NO_TRANSITION_IGNORE_OUT_OF_BOUNDS ||
store_mode == STORE_NO_TRANSITION_HANDLE_COW)) {
// A "normal" IC that handles stores can switch to a version that can
// grow at the end of the array, handle OOB accesses or copy COW arrays
// and still stay MONOMORPHIC.
return PropertyICCompiler::ComputeKeyedStoreMonomorphic(
receiver_map, strict_mode(), store_mode);
}
}
DCHECK(state() != GENERIC);
bool map_added =
AddOneReceiverMapIfMissing(&target_receiver_maps, receiver_map);
if (IsTransitionStoreMode(store_mode)) {
Handle<Map> transitioned_receiver_map =
ComputeTransitionedMap(receiver_map, store_mode);
map_added |= AddOneReceiverMapIfMissing(&target_receiver_maps,
transitioned_receiver_map);
}
if (!map_added) {
// If the miss wasn't due to an unseen map, a polymorphic stub
// won't help, use the generic stub.
TRACE_GENERIC_IC(isolate(), "KeyedStoreIC", "same map added twice");
return generic_stub();
}
// If the maximum number of receiver maps has been exceeded, use the generic
// version of the IC.
if (target_receiver_maps.length() > kMaxKeyedPolymorphism) {
TRACE_GENERIC_IC(isolate(), "KeyedStoreIC", "max polymorph exceeded");
return generic_stub();
}
// Make sure all polymorphic handlers have the same store mode, otherwise the
// generic stub must be used.
store_mode = GetNonTransitioningStoreMode(store_mode);
if (old_store_mode != STANDARD_STORE) {
if (store_mode == STANDARD_STORE) {
store_mode = old_store_mode;
} else if (store_mode != old_store_mode) {
TRACE_GENERIC_IC(isolate(), "KeyedStoreIC", "store mode mismatch");
return generic_stub();
}
}
// If the store mode isn't the standard mode, make sure that all polymorphic
// receivers are either external arrays, or all "normal" arrays. Otherwise,
// use the generic stub.
if (store_mode != STANDARD_STORE) {
int external_arrays = 0;
for (int i = 0; i < target_receiver_maps.length(); ++i) {
if (target_receiver_maps[i]->has_external_array_elements() ||
target_receiver_maps[i]->has_fixed_typed_array_elements()) {
external_arrays++;
}
}
if (external_arrays != 0 &&
external_arrays != target_receiver_maps.length()) {
TRACE_GENERIC_IC(isolate(), "KeyedStoreIC",
"unsupported combination of external and normal arrays");
return generic_stub();
}
}
return PropertyICCompiler::ComputeKeyedStorePolymorphic(
&target_receiver_maps, store_mode, strict_mode());
}
Handle<Map> KeyedStoreIC::ComputeTransitionedMap(
Handle<Map> map, KeyedAccessStoreMode store_mode) {
switch (store_mode) {
case STORE_TRANSITION_SMI_TO_OBJECT:
case STORE_TRANSITION_DOUBLE_TO_OBJECT:
case STORE_AND_GROW_TRANSITION_SMI_TO_OBJECT:
case STORE_AND_GROW_TRANSITION_DOUBLE_TO_OBJECT:
return Map::TransitionElementsTo(map, FAST_ELEMENTS);
case STORE_TRANSITION_SMI_TO_DOUBLE:
case STORE_AND_GROW_TRANSITION_SMI_TO_DOUBLE:
return Map::TransitionElementsTo(map, FAST_DOUBLE_ELEMENTS);
case STORE_TRANSITION_HOLEY_SMI_TO_OBJECT:
case STORE_TRANSITION_HOLEY_DOUBLE_TO_OBJECT:
case STORE_AND_GROW_TRANSITION_HOLEY_SMI_TO_OBJECT:
case STORE_AND_GROW_TRANSITION_HOLEY_DOUBLE_TO_OBJECT:
return Map::TransitionElementsTo(map, FAST_HOLEY_ELEMENTS);
case STORE_TRANSITION_HOLEY_SMI_TO_DOUBLE:
case STORE_AND_GROW_TRANSITION_HOLEY_SMI_TO_DOUBLE:
return Map::TransitionElementsTo(map, FAST_HOLEY_DOUBLE_ELEMENTS);
case STORE_NO_TRANSITION_IGNORE_OUT_OF_BOUNDS:
DCHECK(map->has_external_array_elements());
// Fall through
case STORE_NO_TRANSITION_HANDLE_COW:
case STANDARD_STORE:
case STORE_AND_GROW_NO_TRANSITION:
return map;
}
UNREACHABLE();
return MaybeHandle<Map>().ToHandleChecked();
}
bool IsOutOfBoundsAccess(Handle<JSObject> receiver, int index) {
if (receiver->IsJSArray()) {
return JSArray::cast(*receiver)->length()->IsSmi() &&
index >= Smi::cast(JSArray::cast(*receiver)->length())->value();
}
return index >= receiver->elements()->length();
}
KeyedAccessStoreMode KeyedStoreIC::GetStoreMode(Handle<JSObject> receiver,
Handle<Object> key,
Handle<Object> value) {
Handle<Smi> smi_key = Object::ToSmi(isolate(), key).ToHandleChecked();
int index = smi_key->value();
bool oob_access = IsOutOfBoundsAccess(receiver, index);
// Don't consider this a growing store if the store would send the receiver to
// dictionary mode.
bool allow_growth = receiver->IsJSArray() && oob_access &&
!receiver->WouldConvertToSlowElements(key);
if (allow_growth) {
// Handle growing array in stub if necessary.
if (receiver->HasFastSmiElements()) {
if (value->IsHeapNumber()) {
if (receiver->HasFastHoleyElements()) {
return STORE_AND_GROW_TRANSITION_HOLEY_SMI_TO_DOUBLE;
} else {
return STORE_AND_GROW_TRANSITION_SMI_TO_DOUBLE;
}
}
if (value->IsHeapObject()) {
if (receiver->HasFastHoleyElements()) {
return STORE_AND_GROW_TRANSITION_HOLEY_SMI_TO_OBJECT;
} else {
return STORE_AND_GROW_TRANSITION_SMI_TO_OBJECT;
}
}
} else if (receiver->HasFastDoubleElements()) {
if (!value->IsSmi() && !value->IsHeapNumber()) {
if (receiver->HasFastHoleyElements()) {
return STORE_AND_GROW_TRANSITION_HOLEY_DOUBLE_TO_OBJECT;
} else {
return STORE_AND_GROW_TRANSITION_DOUBLE_TO_OBJECT;
}
}
}
return STORE_AND_GROW_NO_TRANSITION;
} else {
// Handle only in-bounds elements accesses.
if (receiver->HasFastSmiElements()) {
if (value->IsHeapNumber()) {
if (receiver->HasFastHoleyElements()) {
return STORE_TRANSITION_HOLEY_SMI_TO_DOUBLE;
} else {
return STORE_TRANSITION_SMI_TO_DOUBLE;
}
} else if (value->IsHeapObject()) {
if (receiver->HasFastHoleyElements()) {
return STORE_TRANSITION_HOLEY_SMI_TO_OBJECT;
} else {
return STORE_TRANSITION_SMI_TO_OBJECT;
}
}
} else if (receiver->HasFastDoubleElements()) {
if (!value->IsSmi() && !value->IsHeapNumber()) {
if (receiver->HasFastHoleyElements()) {
return STORE_TRANSITION_HOLEY_DOUBLE_TO_OBJECT;
} else {
return STORE_TRANSITION_DOUBLE_TO_OBJECT;
}
}
}
if (!FLAG_trace_external_array_abuse &&
receiver->map()->has_external_array_elements() && oob_access) {
return STORE_NO_TRANSITION_IGNORE_OUT_OF_BOUNDS;
}
Heap* heap = receiver->GetHeap();
if (receiver->elements()->map() == heap->fixed_cow_array_map()) {
return STORE_NO_TRANSITION_HANDLE_COW;
} else {
return STANDARD_STORE;
}
}
}
MaybeHandle<Object> KeyedStoreIC::Store(Handle<Object> object,
Handle<Object> key,
Handle<Object> value) {
// TODO(verwaest): Let SetProperty do the migration, since storing a property
// might deprecate the current map again, if value does not fit.
if (MigrateDeprecated(object)) {
Handle<Object> result;
ASSIGN_RETURN_ON_EXCEPTION(
isolate(), result, Runtime::SetObjectProperty(isolate(), object, key,
value, strict_mode()),
Object);
return result;
}
// Check for non-string values that can be converted into an
// internalized string directly or is representable as a smi.
key = TryConvertKey(key, isolate());
Handle<Object> store_handle;
Handle<Code> stub = generic_stub();
if (key->IsInternalizedString()) {
ASSIGN_RETURN_ON_EXCEPTION(
isolate(), store_handle,
StoreIC::Store(object, Handle<String>::cast(key), value,
JSReceiver::MAY_BE_STORE_FROM_KEYED),
Object);
// TODO(jkummerow): Ideally we'd wrap this in "if (!is_target_set())",
// but doing so causes Hydrogen crashes. Needs investigation.
TRACE_GENERIC_IC(isolate(), "KeyedStoreIC",
"unhandled internalized string key");
TRACE_IC("StoreIC", key);
set_target(*stub);
return store_handle;
}
bool use_ic =
FLAG_use_ic && !object->IsStringWrapper() &&
!object->IsAccessCheckNeeded() && !object->IsJSGlobalProxy() &&
!(object->IsJSObject() && JSObject::cast(*object)->map()->is_observed());
if (use_ic && !object->IsSmi()) {
// Don't use ICs for maps of the objects in Array's prototype chain. We
// expect to be able to trap element sets to objects with those maps in
// the runtime to enable optimization of element hole access.
Handle<HeapObject> heap_object = Handle<HeapObject>::cast(object);
if (heap_object->map()->IsMapInArrayPrototypeChain()) {
TRACE_GENERIC_IC(isolate(), "KeyedStoreIC", "map in array prototype");
use_ic = false;
}
}
if (use_ic) {
DCHECK(!object->IsAccessCheckNeeded());
if (object->IsJSObject()) {
Handle<JSObject> receiver = Handle<JSObject>::cast(object);
bool key_is_smi_like = !Object::ToSmi(isolate(), key).is_null();
if (receiver->elements()->map() ==
isolate()->heap()->sloppy_arguments_elements_map()) {
if (strict_mode() == SLOPPY) {
stub = sloppy_arguments_stub();
} else {
TRACE_GENERIC_IC(isolate(), "KeyedStoreIC", "arguments receiver");
}
} else if (key_is_smi_like &&
!(target().is_identical_to(sloppy_arguments_stub()))) {
// We should go generic if receiver isn't a dictionary, but our
// prototype chain does have dictionary elements. This ensures that
// other non-dictionary receivers in the polymorphic case benefit
// from fast path keyed stores.
if (!(receiver->map()->DictionaryElementsInPrototypeChainOnly())) {
KeyedAccessStoreMode store_mode = GetStoreMode(receiver, key, value);
stub = StoreElementStub(receiver, store_mode);
} else {
TRACE_GENERIC_IC(isolate(), "KeyedStoreIC", "dictionary prototype");
}
} else {
TRACE_GENERIC_IC(isolate(), "KeyedStoreIC", "non-smi-like key");
}
} else {
TRACE_GENERIC_IC(isolate(), "KeyedStoreIC", "non-JSObject receiver");
}
}
if (store_handle.is_null()) {
ASSIGN_RETURN_ON_EXCEPTION(
isolate(), store_handle,
Runtime::SetObjectProperty(isolate(), object, key, value,
strict_mode()),
Object);
}
DCHECK(!is_target_set());
Code* generic = *generic_stub();
if (*stub == generic) {
TRACE_GENERIC_IC(isolate(), "KeyedStoreIC", "set generic");
}
if (*stub == *slow_stub()) {
TRACE_GENERIC_IC(isolate(), "KeyedStoreIC", "slow stub");
}
DCHECK(!stub.is_null());
set_target(*stub);
TRACE_IC("StoreIC", key);
return store_handle;
}
bool CallIC::DoCustomHandler(Handle<Object> receiver, Handle<Object> function,
Handle<TypeFeedbackVector> vector,
Handle<Smi> slot, const CallICState& state) {
DCHECK(FLAG_use_ic && function->IsJSFunction());
// Are we the array function?
Handle<JSFunction> array_function =
Handle<JSFunction>(isolate()->native_context()->array_function());
if (array_function.is_identical_to(Handle<JSFunction>::cast(function))) {
// Alter the slot.
IC::State old_state = FeedbackToState(vector, slot);
Object* feedback = vector->get(slot->value());
if (!feedback->IsAllocationSite()) {
Handle<AllocationSite> new_site =
isolate()->factory()->NewAllocationSite();
vector->set(slot->value(), *new_site);
}
CallIC_ArrayStub stub(isolate(), state);
set_target(*stub.GetCode());
Handle<String> name;
if (array_function->shared()->name()->IsString()) {
name = Handle<String>(String::cast(array_function->shared()->name()),
isolate());
}
IC::State new_state = FeedbackToState(vector, slot);
OnTypeFeedbackChanged(isolate(), address(), old_state, new_state, true);
TRACE_VECTOR_IC("CallIC (custom handler)", name, old_state, new_state);
return true;
}
return false;
}
void CallIC::PatchMegamorphic(Handle<Object> function,
Handle<TypeFeedbackVector> vector,
Handle<Smi> slot) {
CallICState state(target()->extra_ic_state());
IC::State old_state = FeedbackToState(vector, slot);
// We are going generic.
vector->set(slot->value(),
*TypeFeedbackVector::MegamorphicSentinel(isolate()),
SKIP_WRITE_BARRIER);
CallICStub stub(isolate(), state);
Handle<Code> code = stub.GetCode();
set_target(*code);
Handle<Object> name = isolate()->factory()->empty_string();
if (function->IsJSFunction()) {
Handle<JSFunction> js_function = Handle<JSFunction>::cast(function);
name = handle(js_function->shared()->name(), isolate());
}
IC::State new_state = FeedbackToState(vector, slot);
OnTypeFeedbackChanged(isolate(), address(), old_state, new_state, true);
TRACE_VECTOR_IC("CallIC", name, old_state, new_state);
}
void CallIC::HandleMiss(Handle<Object> receiver, Handle<Object> function,
Handle<TypeFeedbackVector> vector, Handle<Smi> slot) {
CallICState state(target()->extra_ic_state());
IC::State old_state = FeedbackToState(vector, slot);
Handle<Object> name = isolate()->factory()->empty_string();
Object* feedback = vector->get(slot->value());
// Hand-coded MISS handling is easier if CallIC slots don't contain smis.
DCHECK(!feedback->IsSmi());
if (feedback->IsJSFunction() || !function->IsJSFunction()) {
// We are going generic.
vector->set(slot->value(),
*TypeFeedbackVector::MegamorphicSentinel(isolate()),
SKIP_WRITE_BARRIER);
} else {
// The feedback is either uninitialized or an allocation site.
// It might be an allocation site because if we re-compile the full code
// to add deoptimization support, we call with the default call-ic, and
// merely need to patch the target to match the feedback.
// TODO(mvstanton): the better approach is to dispense with patching
// altogether, which is in progress.
DCHECK(feedback == *TypeFeedbackVector::UninitializedSentinel(isolate()) ||
feedback->IsAllocationSite());
// Do we want to install a custom handler?
if (FLAG_use_ic &&
DoCustomHandler(receiver, function, vector, slot, state)) {
return;
}
vector->set(slot->value(), *function);
}
if (function->IsJSFunction()) {
Handle<JSFunction> js_function = Handle<JSFunction>::cast(function);
name = handle(js_function->shared()->name(), isolate());
}
IC::State new_state = FeedbackToState(vector, slot);
OnTypeFeedbackChanged(isolate(), address(), old_state, new_state, true);
TRACE_VECTOR_IC("CallIC", name, old_state, new_state);
}
#undef TRACE_IC
// ----------------------------------------------------------------------------
// Static IC stub generators.
//
// Used from ic-<arch>.cc.
RUNTIME_FUNCTION(CallIC_Miss) {
TimerEventScope<TimerEventIcMiss> timer(isolate);
HandleScope scope(isolate);
DCHECK(args.length() == 4);
CallIC ic(isolate);
Handle<Object> receiver = args.at<Object>(0);
Handle<Object> function = args.at<Object>(1);
Handle<TypeFeedbackVector> vector = args.at<TypeFeedbackVector>(2);
Handle<Smi> slot = args.at<Smi>(3);
ic.HandleMiss(receiver, function, vector, slot);
return *function;
}
RUNTIME_FUNCTION(CallIC_Customization_Miss) {
TimerEventScope<TimerEventIcMiss> timer(isolate);
HandleScope scope(isolate);
DCHECK(args.length() == 4);
// A miss on a custom call ic always results in going megamorphic.
CallIC ic(isolate);
Handle<Object> function = args.at<Object>(1);
Handle<TypeFeedbackVector> vector = args.at<TypeFeedbackVector>(2);
Handle<Smi> slot = args.at<Smi>(3);
ic.PatchMegamorphic(function, vector, slot);
return *function;
}
// Used from ic-<arch>.cc.
RUNTIME_FUNCTION(LoadIC_Miss) {
TimerEventScope<TimerEventIcMiss> timer(isolate);
HandleScope scope(isolate);
DCHECK(args.length() == 2);
LoadIC ic(IC::NO_EXTRA_FRAME, isolate);
Handle<Object> receiver = args.at<Object>(0);
Handle<Name> key = args.at<Name>(1);
ic.UpdateState(receiver, key);
Handle<Object> result;
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, result, ic.Load(receiver, key));
return *result;
}
// Used from ic-<arch>.cc
RUNTIME_FUNCTION(KeyedLoadIC_Miss) {
TimerEventScope<TimerEventIcMiss> timer(isolate);
HandleScope scope(isolate);
DCHECK(args.length() == 2);
KeyedLoadIC ic(IC::NO_EXTRA_FRAME, isolate);
Handle<Object> receiver = args.at<Object>(0);
Handle<Object> key = args.at<Object>(1);
ic.UpdateState(receiver, key);
Handle<Object> result;
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, result, ic.Load(receiver, key));
return *result;
}
RUNTIME_FUNCTION(KeyedLoadIC_MissFromStubFailure) {
TimerEventScope<TimerEventIcMiss> timer(isolate);
HandleScope scope(isolate);
DCHECK(args.length() == 2);
KeyedLoadIC ic(IC::EXTRA_CALL_FRAME, isolate);
Handle<Object> receiver = args.at<Object>(0);
Handle<Object> key = args.at<Object>(1);
ic.UpdateState(receiver, key);
Handle<Object> result;
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, result, ic.Load(receiver, key));
return *result;
}
// Used from ic-<arch>.cc.
RUNTIME_FUNCTION(StoreIC_Miss) {
TimerEventScope<TimerEventIcMiss> timer(isolate);
HandleScope scope(isolate);
DCHECK(args.length() == 3);
StoreIC ic(IC::NO_EXTRA_FRAME, isolate);
Handle<Object> receiver = args.at<Object>(0);
Handle<String> key = args.at<String>(1);
ic.UpdateState(receiver, key);
Handle<Object> result;
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
isolate, result, ic.Store(receiver, key, args.at<Object>(2)));
return *result;
}
RUNTIME_FUNCTION(StoreIC_MissFromStubFailure) {
TimerEventScope<TimerEventIcMiss> timer(isolate);
HandleScope scope(isolate);
DCHECK(args.length() == 3);
StoreIC ic(IC::EXTRA_CALL_FRAME, isolate);
Handle<Object> receiver = args.at<Object>(0);
Handle<String> key = args.at<String>(1);
ic.UpdateState(receiver, key);
Handle<Object> result;
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
isolate, result, ic.Store(receiver, key, args.at<Object>(2)));
return *result;
}
// Extend storage is called in a store inline cache when
// it is necessary to extend the properties array of a
// JSObject.
RUNTIME_FUNCTION(SharedStoreIC_ExtendStorage) {
TimerEventScope<TimerEventIcMiss> timer(isolate);
HandleScope shs(isolate);
DCHECK(args.length() == 3);
// Convert the parameters
Handle<JSObject> object = args.at<JSObject>(0);
Handle<Map> transition = args.at<Map>(1);
Handle<Object> value = args.at<Object>(2);
// Check the object has run out out property space.
DCHECK(object->HasFastProperties());
DCHECK(object->map()->unused_property_fields() == 0);
JSObject::MigrateToNewProperty(object, transition, value);
// Return the stored value.
return *value;
}
// Used from ic-<arch>.cc.
RUNTIME_FUNCTION(KeyedStoreIC_Miss) {
TimerEventScope<TimerEventIcMiss> timer(isolate);
HandleScope scope(isolate);
DCHECK(args.length() == 3);
KeyedStoreIC ic(IC::NO_EXTRA_FRAME, isolate);
Handle<Object> receiver = args.at<Object>(0);
Handle<Object> key = args.at<Object>(1);
ic.UpdateState(receiver, key);
Handle<Object> result;
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
isolate, result, ic.Store(receiver, key, args.at<Object>(2)));
return *result;
}
RUNTIME_FUNCTION(KeyedStoreIC_MissFromStubFailure) {
TimerEventScope<TimerEventIcMiss> timer(isolate);
HandleScope scope(isolate);
DCHECK(args.length() == 3);
KeyedStoreIC ic(IC::EXTRA_CALL_FRAME, isolate);
Handle<Object> receiver = args.at<Object>(0);
Handle<Object> key = args.at<Object>(1);
ic.UpdateState(receiver, key);
Handle<Object> result;
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
isolate, result, ic.Store(receiver, key, args.at<Object>(2)));
return *result;
}
RUNTIME_FUNCTION(StoreIC_Slow) {
HandleScope scope(isolate);
DCHECK(args.length() == 3);
StoreIC ic(IC::NO_EXTRA_FRAME, isolate);
Handle<Object> object = args.at<Object>(0);
Handle<Object> key = args.at<Object>(1);
Handle<Object> value = args.at<Object>(2);
StrictMode strict_mode = ic.strict_mode();
Handle<Object> result;
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
isolate, result,
Runtime::SetObjectProperty(isolate, object, key, value, strict_mode));
return *result;
}
RUNTIME_FUNCTION(KeyedStoreIC_Slow) {
HandleScope scope(isolate);
DCHECK(args.length() == 3);
KeyedStoreIC ic(IC::NO_EXTRA_FRAME, isolate);
Handle<Object> object = args.at<Object>(0);
Handle<Object> key = args.at<Object>(1);
Handle<Object> value = args.at<Object>(2);
StrictMode strict_mode = ic.strict_mode();
Handle<Object> result;
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
isolate, result,
Runtime::SetObjectProperty(isolate, object, key, value, strict_mode));
return *result;
}
RUNTIME_FUNCTION(ElementsTransitionAndStoreIC_Miss) {
TimerEventScope<TimerEventIcMiss> timer(isolate);
HandleScope scope(isolate);
DCHECK(args.length() == 4);
KeyedStoreIC ic(IC::EXTRA_CALL_FRAME, isolate);
Handle<Object> value = args.at<Object>(0);
Handle<Map> map = args.at<Map>(1);
Handle<Object> key = args.at<Object>(2);
Handle<Object> object = args.at<Object>(3);
StrictMode strict_mode = ic.strict_mode();
if (object->IsJSObject()) {
JSObject::TransitionElementsKind(Handle<JSObject>::cast(object),
map->elements_kind());
}
Handle<Object> result;
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
isolate, result,
Runtime::SetObjectProperty(isolate, object, key, value, strict_mode));
return *result;
}
MaybeHandle<Object> BinaryOpIC::Transition(
Handle<AllocationSite> allocation_site, Handle<Object> left,
Handle<Object> right) {
BinaryOpICState state(isolate(), target()->extra_ic_state());
// Compute the actual result using the builtin for the binary operation.
Object* builtin = isolate()->js_builtins_object()->javascript_builtin(
TokenToJSBuiltin(state.op()));
Handle<JSFunction> function = handle(JSFunction::cast(builtin), isolate());
Handle<Object> result;
ASSIGN_RETURN_ON_EXCEPTION(
isolate(), result, Execution::Call(isolate(), function, left, 1, &right),
Object);
// Execution::Call can execute arbitrary JavaScript, hence potentially
// update the state of this very IC, so we must update the stored state.
UpdateTarget();
// Compute the new state.
BinaryOpICState old_state(isolate(), target()->extra_ic_state());
state.Update(left, right, result);
// Check if we have a string operation here.
Handle<Code> target;
if (!allocation_site.is_null() || state.ShouldCreateAllocationMementos()) {
// Setup the allocation site on-demand.
if (allocation_site.is_null()) {
allocation_site = isolate()->factory()->NewAllocationSite();
}
// Install the stub with an allocation site.
BinaryOpICWithAllocationSiteStub stub(isolate(), state);
target = stub.GetCodeCopyFromTemplate(allocation_site);
// Sanity check the trampoline stub.
DCHECK_EQ(*allocation_site, target->FindFirstAllocationSite());
} else {
// Install the generic stub.
BinaryOpICStub stub(isolate(), state);
target = stub.GetCode();
// Sanity check the generic stub.
DCHECK_EQ(NULL, target->FindFirstAllocationSite());
}
set_target(*target);
if (FLAG_trace_ic) {
OFStream os(stdout);
os << "[BinaryOpIC" << old_state << " => " << state << " @ "
<< static_cast<void*>(*target) << " <- ";
JavaScriptFrame::PrintTop(isolate(), stdout, false, true);
if (!allocation_site.is_null()) {
os << " using allocation site " << static_cast<void*>(*allocation_site);
}
os << "]" << endl;
}
// Patch the inlined smi code as necessary.
if (!old_state.UseInlinedSmiCode() && state.UseInlinedSmiCode()) {
PatchInlinedSmiCode(address(), ENABLE_INLINED_SMI_CHECK);
} else if (old_state.UseInlinedSmiCode() && !state.UseInlinedSmiCode()) {
PatchInlinedSmiCode(address(), DISABLE_INLINED_SMI_CHECK);
}
return result;
}
RUNTIME_FUNCTION(BinaryOpIC_Miss) {
TimerEventScope<TimerEventIcMiss> timer(isolate);
HandleScope scope(isolate);
DCHECK_EQ(2, args.length());
Handle<Object> left = args.at<Object>(BinaryOpICStub::kLeft);
Handle<Object> right = args.at<Object>(BinaryOpICStub::kRight);
BinaryOpIC ic(isolate);
Handle<Object> result;
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
isolate, result,
ic.Transition(Handle<AllocationSite>::null(), left, right));
return *result;
}
RUNTIME_FUNCTION(BinaryOpIC_MissWithAllocationSite) {
TimerEventScope<TimerEventIcMiss> timer(isolate);
HandleScope scope(isolate);
DCHECK_EQ(3, args.length());
Handle<AllocationSite> allocation_site =
args.at<AllocationSite>(BinaryOpWithAllocationSiteStub::kAllocationSite);
Handle<Object> left = args.at<Object>(BinaryOpWithAllocationSiteStub::kLeft);
Handle<Object> right =
args.at<Object>(BinaryOpWithAllocationSiteStub::kRight);
BinaryOpIC ic(isolate);
Handle<Object> result;
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
isolate, result, ic.Transition(allocation_site, left, right));
return *result;
}
Code* CompareIC::GetRawUninitialized(Isolate* isolate, Token::Value op) {
CompareICStub stub(isolate, op, CompareICState::UNINITIALIZED,
CompareICState::UNINITIALIZED,
CompareICState::UNINITIALIZED);
Code* code = NULL;
CHECK(stub.FindCodeInCache(&code));
return code;
}
Handle<Code> CompareIC::GetUninitialized(Isolate* isolate, Token::Value op) {
CompareICStub stub(isolate, op, CompareICState::UNINITIALIZED,
CompareICState::UNINITIALIZED,
CompareICState::UNINITIALIZED);
return stub.GetCode();
}
Code* CompareIC::UpdateCaches(Handle<Object> x, Handle<Object> y) {
HandleScope scope(isolate());
CompareICStub old_stub(target()->stub_key(), isolate());
CompareICState::State new_left =
CompareICState::NewInputState(old_stub.left(), x);
CompareICState::State new_right =
CompareICState::NewInputState(old_stub.right(), y);
CompareICState::State state = CompareICState::TargetState(
old_stub.state(), old_stub.left(), old_stub.right(), op_,
HasInlinedSmiCode(address()), x, y);
CompareICStub stub(isolate(), op_, new_left, new_right, state);
if (state == CompareICState::KNOWN_OBJECT) {
stub.set_known_map(
Handle<Map>(Handle<JSObject>::cast(x)->map(), isolate()));
}
Handle<Code> new_target = stub.GetCode();
set_target(*new_target);
if (FLAG_trace_ic) {
PrintF("[CompareIC in ");
JavaScriptFrame::PrintTop(isolate(), stdout, false, true);
PrintF(" ((%s+%s=%s)->(%s+%s=%s))#%s @ %p]\n",
CompareICState::GetStateName(old_stub.left()),
CompareICState::GetStateName(old_stub.right()),
CompareICState::GetStateName(old_stub.state()),
CompareICState::GetStateName(new_left),
CompareICState::GetStateName(new_right),
CompareICState::GetStateName(state), Token::Name(op_),
static_cast<void*>(*stub.GetCode()));
}
// Activate inlined smi code.
if (old_stub.state() == CompareICState::UNINITIALIZED) {
PatchInlinedSmiCode(address(), ENABLE_INLINED_SMI_CHECK);
}
return *new_target;
}
// Used from CompareICStub::GenerateMiss in code-stubs-<arch>.cc.
RUNTIME_FUNCTION(CompareIC_Miss) {
TimerEventScope<TimerEventIcMiss> timer(isolate);
HandleScope scope(isolate);
DCHECK(args.length() == 3);
CompareIC ic(isolate, static_cast<Token::Value>(args.smi_at(2)));
return ic.UpdateCaches(args.at<Object>(0), args.at<Object>(1));
}
void CompareNilIC::Clear(Address address, Code* target,
ConstantPoolArray* constant_pool) {
if (IsCleared(target)) return;
ExtraICState state = target->extra_ic_state();
CompareNilICStub stub(target->GetIsolate(), state,
HydrogenCodeStub::UNINITIALIZED);
stub.ClearState();
Code* code = NULL;
CHECK(stub.FindCodeInCache(&code));
SetTargetAtAddress(address, code, constant_pool);
}
Handle<Object> CompareNilIC::DoCompareNilSlow(Isolate* isolate, NilValue nil,
Handle<Object> object) {
if (object->IsNull() || object->IsUndefined()) {
return handle(Smi::FromInt(true), isolate);
}
return handle(Smi::FromInt(object->IsUndetectableObject()), isolate);
}
Handle<Object> CompareNilIC::CompareNil(Handle<Object> object) {
ExtraICState extra_ic_state = target()->extra_ic_state();
CompareNilICStub stub(isolate(), extra_ic_state);
// Extract the current supported types from the patched IC and calculate what
// types must be supported as a result of the miss.
bool already_monomorphic = stub.IsMonomorphic();
stub.UpdateStatus(object);
NilValue nil = stub.nil_value();
// Find or create the specialized stub to support the new set of types.
Handle<Code> code;
if (stub.IsMonomorphic()) {
Handle<Map> monomorphic_map(already_monomorphic && FirstTargetMap() != NULL
? FirstTargetMap()
: HeapObject::cast(*object)->map());
code = PropertyICCompiler::ComputeCompareNil(monomorphic_map, &stub);
} else {
code = stub.GetCode();
}
set_target(*code);
return DoCompareNilSlow(isolate(), nil, object);
}
RUNTIME_FUNCTION(CompareNilIC_Miss) {
TimerEventScope<TimerEventIcMiss> timer(isolate);
HandleScope scope(isolate);
Handle<Object> object = args.at<Object>(0);
CompareNilIC ic(isolate);
return *ic.CompareNil(object);
}
RUNTIME_FUNCTION(Unreachable) {
UNREACHABLE();
CHECK(false);
return isolate->heap()->undefined_value();
}
Builtins::JavaScript BinaryOpIC::TokenToJSBuiltin(Token::Value op) {
switch (op) {
default:
UNREACHABLE();
case Token::ADD:
return Builtins::ADD;
break;
case Token::SUB:
return Builtins::SUB;
break;
case Token::MUL:
return Builtins::MUL;
break;
case Token::DIV:
return Builtins::DIV;
break;
case Token::MOD:
return Builtins::MOD;
break;
case Token::BIT_OR:
return Builtins::BIT_OR;
break;
case Token::BIT_AND:
return Builtins::BIT_AND;
break;
case Token::BIT_XOR:
return Builtins::BIT_XOR;
break;
case Token::SAR:
return Builtins::SAR;
break;
case Token::SHR:
return Builtins::SHR;
break;
case Token::SHL:
return Builtins::SHL;
break;
}
}
Handle<Object> ToBooleanIC::ToBoolean(Handle<Object> object) {
ToBooleanStub stub(isolate(), target()->extra_ic_state());
bool to_boolean_value = stub.UpdateStatus(object);
Handle<Code> code = stub.GetCode();
set_target(*code);
return handle(Smi::FromInt(to_boolean_value ? 1 : 0), isolate());
}
RUNTIME_FUNCTION(ToBooleanIC_Miss) {
TimerEventScope<TimerEventIcMiss> timer(isolate);
DCHECK(args.length() == 1);
HandleScope scope(isolate);
Handle<Object> object = args.at<Object>(0);
ToBooleanIC ic(isolate);
return *ic.ToBoolean(object);
}
RUNTIME_FUNCTION(StoreCallbackProperty) {
Handle<JSObject> receiver = args.at<JSObject>(0);
Handle<JSObject> holder = args.at<JSObject>(1);
Handle<ExecutableAccessorInfo> callback = args.at<ExecutableAccessorInfo>(2);
Handle<Name> name = args.at<Name>(3);
Handle<Object> value = args.at<Object>(4);
HandleScope scope(isolate);
DCHECK(callback->IsCompatibleReceiver(*receiver));
Address setter_address = v8::ToCData<Address>(callback->setter());
v8::AccessorNameSetterCallback fun =
FUNCTION_CAST<v8::AccessorNameSetterCallback>(setter_address);
DCHECK(fun != NULL);
LOG(isolate, ApiNamedPropertyAccess("store", *receiver, *name));
PropertyCallbackArguments custom_args(isolate, callback->data(), *receiver,
*holder);
custom_args.Call(fun, v8::Utils::ToLocal(name), v8::Utils::ToLocal(value));
RETURN_FAILURE_IF_SCHEDULED_EXCEPTION(isolate);
return *value;
}
/**
* Attempts to load a property with an interceptor (which must be present),
* but doesn't search the prototype chain.
*
* Returns |Heap::no_interceptor_result_sentinel()| if interceptor doesn't
* provide any value for the given name.
*/
RUNTIME_FUNCTION(LoadPropertyWithInterceptorOnly) {
DCHECK(args.length() == NamedLoadHandlerCompiler::kInterceptorArgsLength);
Handle<Name> name_handle =
args.at<Name>(NamedLoadHandlerCompiler::kInterceptorArgsNameIndex);
Handle<InterceptorInfo> interceptor_info = args.at<InterceptorInfo>(
NamedLoadHandlerCompiler::kInterceptorArgsInfoIndex);
// TODO(rossberg): Support symbols in the API.
if (name_handle->IsSymbol())
return isolate->heap()->no_interceptor_result_sentinel();
Handle<String> name = Handle<String>::cast(name_handle);
Address getter_address = v8::ToCData<Address>(interceptor_info->getter());
v8::NamedPropertyGetterCallback getter =
FUNCTION_CAST<v8::NamedPropertyGetterCallback>(getter_address);
DCHECK(getter != NULL);
Handle<JSObject> receiver =
args.at<JSObject>(NamedLoadHandlerCompiler::kInterceptorArgsThisIndex);
Handle<JSObject> holder =
args.at<JSObject>(NamedLoadHandlerCompiler::kInterceptorArgsHolderIndex);
PropertyCallbackArguments callback_args(isolate, interceptor_info->data(),
*receiver, *holder);
{
// Use the interceptor getter.
HandleScope scope(isolate);
v8::Handle<v8::Value> r =
callback_args.Call(getter, v8::Utils::ToLocal(name));
RETURN_FAILURE_IF_SCHEDULED_EXCEPTION(isolate);
if (!r.IsEmpty()) {
Handle<Object> result = v8::Utils::OpenHandle(*r);
result->VerifyApiCallResultType();
return *v8::Utils::OpenHandle(*r);
}
}
return isolate->heap()->no_interceptor_result_sentinel();
}
static Object* ThrowReferenceError(Isolate* isolate, Name* name) {
// If the load is non-contextual, just return the undefined result.
// Note that both keyed and non-keyed loads may end up here.
HandleScope scope(isolate);
LoadIC ic(IC::NO_EXTRA_FRAME, isolate);
if (ic.contextual_mode() != CONTEXTUAL) {
return isolate->heap()->undefined_value();
}
// Throw a reference error.
Handle<Name> name_handle(name);
THROW_NEW_ERROR_RETURN_FAILURE(
isolate, NewReferenceError("not_defined", HandleVector(&name_handle, 1)));
}
/**
* Loads a property with an interceptor performing post interceptor
* lookup if interceptor failed.
*/
RUNTIME_FUNCTION(LoadPropertyWithInterceptor) {
HandleScope scope(isolate);
DCHECK(args.length() == NamedLoadHandlerCompiler::kInterceptorArgsLength);
Handle<Name> name =
args.at<Name>(NamedLoadHandlerCompiler::kInterceptorArgsNameIndex);
Handle<JSObject> receiver =
args.at<JSObject>(NamedLoadHandlerCompiler::kInterceptorArgsThisIndex);
Handle<JSObject> holder =
args.at<JSObject>(NamedLoadHandlerCompiler::kInterceptorArgsHolderIndex);
Handle<Object> result;
LookupIterator it(receiver, name, holder);
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, result,
JSObject::GetProperty(&it));
if (it.IsFound()) return *result;
return ThrowReferenceError(isolate, Name::cast(args[0]));
}
RUNTIME_FUNCTION(StorePropertyWithInterceptor) {
HandleScope scope(isolate);
DCHECK(args.length() == 3);
StoreIC ic(IC::NO_EXTRA_FRAME, isolate);
Handle<JSObject> receiver = args.at<JSObject>(0);
Handle<Name> name = args.at<Name>(1);
Handle<Object> value = args.at<Object>(2);
#ifdef DEBUG
PrototypeIterator iter(isolate, receiver,
PrototypeIterator::START_AT_RECEIVER);
bool found = false;
while (!iter.IsAtEnd(PrototypeIterator::END_AT_NON_HIDDEN)) {
Handle<Object> current = PrototypeIterator::GetCurrent(iter);
if (current->IsJSObject() &&
Handle<JSObject>::cast(current)->HasNamedInterceptor()) {
found = true;
break;
}
}
DCHECK(found);
#endif
Handle<Object> result;
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
isolate, result,
JSObject::SetProperty(receiver, name, value, ic.strict_mode()));
return *result;
}
RUNTIME_FUNCTION(LoadElementWithInterceptor) {
HandleScope scope(isolate);
Handle<JSObject> receiver = args.at<JSObject>(0);
DCHECK(args.smi_at(1) >= 0);
uint32_t index = args.smi_at(1);
Handle<Object> result;
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
isolate, result,
JSObject::GetElementWithInterceptor(receiver, receiver, index));
return *result;
}
RUNTIME_FUNCTION(VectorLoadIC_MissFromStubFailure) {
// TODO(mvstanton): To be enabled when ICs can accept a vector and slot
return NULL;
}
RUNTIME_FUNCTION(VectorKeyedLoadIC_MissFromStubFailure) {
// TODO(mvstanton): To be enabled when ICs can accept a vector and slot
return NULL;
}
static const Address IC_utilities[] = {
#define ADDR(name) FUNCTION_ADDR(name),
IC_UTIL_LIST(ADDR) NULL
#undef ADDR
};
Address IC::AddressFromUtilityId(IC::UtilityId id) { return IC_utilities[id]; }
}
} // namespace v8::internal