// Copyright 2014 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.
#if V8_TARGET_ARCH_S390
#include "src/code-stubs.h"
#include "src/api-arguments.h"
#include "src/base/bits.h"
#include "src/bootstrapper.h"
#include "src/codegen.h"
#include "src/ic/handler-compiler.h"
#include "src/ic/ic.h"
#include "src/ic/stub-cache.h"
#include "src/isolate.h"
#include "src/regexp/jsregexp.h"
#include "src/regexp/regexp-macro-assembler.h"
#include "src/runtime/runtime.h"
#include "src/s390/code-stubs-s390.h"
namespace v8 {
namespace internal {
#define __ ACCESS_MASM(masm)
void ArrayNArgumentsConstructorStub::Generate(MacroAssembler* masm) {
__ ShiftLeftP(r1, r2, Operand(kPointerSizeLog2));
__ StoreP(r3, MemOperand(sp, r1));
__ push(r3);
__ push(r4);
__ AddP(r2, r2, Operand(3));
__ TailCallRuntime(Runtime::kNewArray);
}
void FastArrayPushStub::InitializeDescriptor(CodeStubDescriptor* descriptor) {
Address deopt_handler = Runtime::FunctionForId(Runtime::kArrayPush)->entry;
descriptor->Initialize(r2, deopt_handler, -1, JS_FUNCTION_STUB_MODE);
}
void FastFunctionBindStub::InitializeDescriptor(
CodeStubDescriptor* descriptor) {
Address deopt_handler = Runtime::FunctionForId(Runtime::kFunctionBind)->entry;
descriptor->Initialize(r2, deopt_handler, -1, JS_FUNCTION_STUB_MODE);
}
static void EmitIdenticalObjectComparison(MacroAssembler* masm, Label* slow,
Condition cond);
static void EmitSmiNonsmiComparison(MacroAssembler* masm, Register lhs,
Register rhs, Label* lhs_not_nan,
Label* slow, bool strict);
static void EmitStrictTwoHeapObjectCompare(MacroAssembler* masm, Register lhs,
Register rhs);
void HydrogenCodeStub::GenerateLightweightMiss(MacroAssembler* masm,
ExternalReference miss) {
// Update the static counter each time a new code stub is generated.
isolate()->counters()->code_stubs()->Increment();
CallInterfaceDescriptor descriptor = GetCallInterfaceDescriptor();
int param_count = descriptor.GetRegisterParameterCount();
{
// Call the runtime system in a fresh internal frame.
FrameScope scope(masm, StackFrame::INTERNAL);
DCHECK(param_count == 0 ||
r2.is(descriptor.GetRegisterParameter(param_count - 1)));
// Push arguments
for (int i = 0; i < param_count; ++i) {
__ push(descriptor.GetRegisterParameter(i));
}
__ CallExternalReference(miss, param_count);
}
__ Ret();
}
void DoubleToIStub::Generate(MacroAssembler* masm) {
Label out_of_range, only_low, negate, done, fastpath_done;
Register input_reg = source();
Register result_reg = destination();
DCHECK(is_truncating());
int double_offset = offset();
// Immediate values for this stub fit in instructions, so it's safe to use ip.
Register scratch = GetRegisterThatIsNotOneOf(input_reg, result_reg);
Register scratch_low =
GetRegisterThatIsNotOneOf(input_reg, result_reg, scratch);
Register scratch_high =
GetRegisterThatIsNotOneOf(input_reg, result_reg, scratch, scratch_low);
DoubleRegister double_scratch = kScratchDoubleReg;
__ push(scratch);
// Account for saved regs if input is sp.
if (input_reg.is(sp)) double_offset += kPointerSize;
if (!skip_fastpath()) {
// Load double input.
__ LoadDouble(double_scratch, MemOperand(input_reg, double_offset));
// Do fast-path convert from double to int.
__ ConvertDoubleToInt64(double_scratch,
#if !V8_TARGET_ARCH_S390X
scratch,
#endif
result_reg, d0);
// Test for overflow
#if V8_TARGET_ARCH_S390X
__ TestIfInt32(result_reg, r0);
#else
__ TestIfInt32(scratch, result_reg, r0);
#endif
__ beq(&fastpath_done, Label::kNear);
}
__ Push(scratch_high, scratch_low);
// Account for saved regs if input is sp.
if (input_reg.is(sp)) double_offset += 2 * kPointerSize;
__ LoadlW(scratch_high,
MemOperand(input_reg, double_offset + Register::kExponentOffset));
__ LoadlW(scratch_low,
MemOperand(input_reg, double_offset + Register::kMantissaOffset));
__ ExtractBitMask(scratch, scratch_high, HeapNumber::kExponentMask);
// Load scratch with exponent - 1. This is faster than loading
// with exponent because Bias + 1 = 1024 which is a *S390* immediate value.
STATIC_ASSERT(HeapNumber::kExponentBias + 1 == 1024);
__ SubP(scratch, Operand(HeapNumber::kExponentBias + 1));
// If exponent is greater than or equal to 84, the 32 less significant
// bits are 0s (2^84 = 1, 52 significant bits, 32 uncoded bits),
// the result is 0.
// Compare exponent with 84 (compare exponent - 1 with 83).
__ CmpP(scratch, Operand(83));
__ bge(&out_of_range, Label::kNear);
// If we reach this code, 31 <= exponent <= 83.
// So, we don't have to handle cases where 0 <= exponent <= 20 for
// which we would need to shift right the high part of the mantissa.
// Scratch contains exponent - 1.
// Load scratch with 52 - exponent (load with 51 - (exponent - 1)).
__ Load(r0, Operand(51));
__ SubP(scratch, r0, scratch);
__ CmpP(scratch, Operand::Zero());
__ ble(&only_low, Label::kNear);
// 21 <= exponent <= 51, shift scratch_low and scratch_high
// to generate the result.
__ ShiftRight(scratch_low, scratch_low, scratch);
// Scratch contains: 52 - exponent.
// We needs: exponent - 20.
// So we use: 32 - scratch = 32 - 52 + exponent = exponent - 20.
__ Load(r0, Operand(32));
__ SubP(scratch, r0, scratch);
__ ExtractBitMask(result_reg, scratch_high, HeapNumber::kMantissaMask);
// Set the implicit 1 before the mantissa part in scratch_high.
STATIC_ASSERT(HeapNumber::kMantissaBitsInTopWord >= 16);
__ Load(r0, Operand(1 << ((HeapNumber::kMantissaBitsInTopWord)-16)));
__ ShiftLeftP(r0, r0, Operand(16));
__ OrP(result_reg, result_reg, r0);
__ ShiftLeft(r0, result_reg, scratch);
__ OrP(result_reg, scratch_low, r0);
__ b(&negate, Label::kNear);
__ bind(&out_of_range);
__ mov(result_reg, Operand::Zero());
__ b(&done, Label::kNear);
__ bind(&only_low);
// 52 <= exponent <= 83, shift only scratch_low.
// On entry, scratch contains: 52 - exponent.
__ LoadComplementRR(scratch, scratch);
__ ShiftLeft(result_reg, scratch_low, scratch);
__ bind(&negate);
// If input was positive, scratch_high ASR 31 equals 0 and
// scratch_high LSR 31 equals zero.
// New result = (result eor 0) + 0 = result.
// If the input was negative, we have to negate the result.
// Input_high ASR 31 equals 0xffffffff and scratch_high LSR 31 equals 1.
// New result = (result eor 0xffffffff) + 1 = 0 - result.
__ ShiftRightArith(r0, scratch_high, Operand(31));
#if V8_TARGET_ARCH_S390X
__ lgfr(r0, r0);
__ ShiftRightP(r0, r0, Operand(32));
#endif
__ XorP(result_reg, r0);
__ ShiftRight(r0, scratch_high, Operand(31));
__ AddP(result_reg, r0);
__ bind(&done);
__ Pop(scratch_high, scratch_low);
__ bind(&fastpath_done);
__ pop(scratch);
__ Ret();
}
// Handle the case where the lhs and rhs are the same object.
// Equality is almost reflexive (everything but NaN), so this is a test
// for "identity and not NaN".
static void EmitIdenticalObjectComparison(MacroAssembler* masm, Label* slow,
Condition cond) {
Label not_identical;
Label heap_number, return_equal;
__ CmpP(r2, r3);
__ bne(¬_identical);
// Test for NaN. Sadly, we can't just compare to Factory::nan_value(),
// so we do the second best thing - test it ourselves.
// They are both equal and they are not both Smis so both of them are not
// Smis. If it's not a heap number, then return equal.
if (cond == lt || cond == gt) {
// Call runtime on identical JSObjects.
__ CompareObjectType(r2, r6, r6, FIRST_JS_RECEIVER_TYPE);
__ bge(slow);
// Call runtime on identical symbols since we need to throw a TypeError.
__ CmpP(r6, Operand(SYMBOL_TYPE));
__ beq(slow);
// Call runtime on identical SIMD values since we must throw a TypeError.
__ CmpP(r6, Operand(SIMD128_VALUE_TYPE));
__ beq(slow);
} else {
__ CompareObjectType(r2, r6, r6, HEAP_NUMBER_TYPE);
__ beq(&heap_number);
// Comparing JS objects with <=, >= is complicated.
if (cond != eq) {
__ CmpP(r6, Operand(FIRST_JS_RECEIVER_TYPE));
__ bge(slow);
// Call runtime on identical symbols since we need to throw a TypeError.
__ CmpP(r6, Operand(SYMBOL_TYPE));
__ beq(slow);
// Call runtime on identical SIMD values since we must throw a TypeError.
__ CmpP(r6, Operand(SIMD128_VALUE_TYPE));
__ beq(slow);
// Normally here we fall through to return_equal, but undefined is
// special: (undefined == undefined) == true, but
// (undefined <= undefined) == false! See ECMAScript 11.8.5.
if (cond == le || cond == ge) {
__ CmpP(r6, Operand(ODDBALL_TYPE));
__ bne(&return_equal);
__ CompareRoot(r2, Heap::kUndefinedValueRootIndex);
__ bne(&return_equal);
if (cond == le) {
// undefined <= undefined should fail.
__ LoadImmP(r2, Operand(GREATER));
} else {
// undefined >= undefined should fail.
__ LoadImmP(r2, Operand(LESS));
}
__ Ret();
}
}
}
__ bind(&return_equal);
if (cond == lt) {
__ LoadImmP(r2, Operand(GREATER)); // Things aren't less than themselves.
} else if (cond == gt) {
__ LoadImmP(r2, Operand(LESS)); // Things aren't greater than themselves.
} else {
__ LoadImmP(r2, Operand(EQUAL)); // Things are <=, >=, ==, === themselves
}
__ Ret();
// For less and greater we don't have to check for NaN since the result of
// x < x is false regardless. For the others here is some code to check
// for NaN.
if (cond != lt && cond != gt) {
__ bind(&heap_number);
// It is a heap number, so return non-equal if it's NaN and equal if it's
// not NaN.
// The representation of NaN values has all exponent bits (52..62) set,
// and not all mantissa bits (0..51) clear.
// Read top bits of double representation (second word of value).
__ LoadlW(r4, FieldMemOperand(r2, HeapNumber::kExponentOffset));
// Test that exponent bits are all set.
STATIC_ASSERT(HeapNumber::kExponentMask == 0x7ff00000u);
__ ExtractBitMask(r5, r4, HeapNumber::kExponentMask);
__ CmpLogicalP(r5, Operand(0x7ff));
__ bne(&return_equal);
// Shift out flag and all exponent bits, retaining only mantissa.
__ sll(r4, Operand(HeapNumber::kNonMantissaBitsInTopWord));
// Or with all low-bits of mantissa.
__ LoadlW(r5, FieldMemOperand(r2, HeapNumber::kMantissaOffset));
__ OrP(r2, r5, r4);
__ CmpP(r2, Operand::Zero());
// For equal we already have the right value in r2: Return zero (equal)
// if all bits in mantissa are zero (it's an Infinity) and non-zero if
// not (it's a NaN). For <= and >= we need to load r0 with the failing
// value if it's a NaN.
if (cond != eq) {
Label not_equal;
__ bne(¬_equal, Label::kNear);
// All-zero means Infinity means equal.
__ Ret();
__ bind(¬_equal);
if (cond == le) {
__ LoadImmP(r2, Operand(GREATER)); // NaN <= NaN should fail.
} else {
__ LoadImmP(r2, Operand(LESS)); // NaN >= NaN should fail.
}
}
__ Ret();
}
// No fall through here.
__ bind(¬_identical);
}
// See comment at call site.
static void EmitSmiNonsmiComparison(MacroAssembler* masm, Register lhs,
Register rhs, Label* lhs_not_nan,
Label* slow, bool strict) {
DCHECK((lhs.is(r2) && rhs.is(r3)) || (lhs.is(r3) && rhs.is(r2)));
Label rhs_is_smi;
__ JumpIfSmi(rhs, &rhs_is_smi);
// Lhs is a Smi. Check whether the rhs is a heap number.
__ CompareObjectType(rhs, r5, r6, HEAP_NUMBER_TYPE);
if (strict) {
// If rhs is not a number and lhs is a Smi then strict equality cannot
// succeed. Return non-equal
// If rhs is r2 then there is already a non zero value in it.
Label skip;
__ beq(&skip, Label::kNear);
if (!rhs.is(r2)) {
__ mov(r2, Operand(NOT_EQUAL));
}
__ Ret();
__ bind(&skip);
} else {
// Smi compared non-strictly with a non-Smi non-heap-number. Call
// the runtime.
__ bne(slow);
}
// Lhs is a smi, rhs is a number.
// Convert lhs to a double in d7.
__ SmiToDouble(d7, lhs);
// Load the double from rhs, tagged HeapNumber r2, to d6.
__ LoadDouble(d6, FieldMemOperand(rhs, HeapNumber::kValueOffset));
// We now have both loaded as doubles but we can skip the lhs nan check
// since it's a smi.
__ b(lhs_not_nan);
__ bind(&rhs_is_smi);
// Rhs is a smi. Check whether the non-smi lhs is a heap number.
__ CompareObjectType(lhs, r6, r6, HEAP_NUMBER_TYPE);
if (strict) {
// If lhs is not a number and rhs is a smi then strict equality cannot
// succeed. Return non-equal.
// If lhs is r2 then there is already a non zero value in it.
Label skip;
__ beq(&skip, Label::kNear);
if (!lhs.is(r2)) {
__ mov(r2, Operand(NOT_EQUAL));
}
__ Ret();
__ bind(&skip);
} else {
// Smi compared non-strictly with a non-smi non-heap-number. Call
// the runtime.
__ bne(slow);
}
// Rhs is a smi, lhs is a heap number.
// Load the double from lhs, tagged HeapNumber r3, to d7.
__ LoadDouble(d7, FieldMemOperand(lhs, HeapNumber::kValueOffset));
// Convert rhs to a double in d6.
__ SmiToDouble(d6, rhs);
// Fall through to both_loaded_as_doubles.
}
// See comment at call site.
static void EmitStrictTwoHeapObjectCompare(MacroAssembler* masm, Register lhs,
Register rhs) {
DCHECK((lhs.is(r2) && rhs.is(r3)) || (lhs.is(r3) && rhs.is(r2)));
// If either operand is a JS object or an oddball value, then they are
// not equal since their pointers are different.
// There is no test for undetectability in strict equality.
STATIC_ASSERT(LAST_TYPE == LAST_JS_RECEIVER_TYPE);
Label first_non_object;
// Get the type of the first operand into r4 and compare it with
// FIRST_JS_RECEIVER_TYPE.
__ CompareObjectType(rhs, r4, r4, FIRST_JS_RECEIVER_TYPE);
__ blt(&first_non_object, Label::kNear);
// Return non-zero (r2 is not zero)
Label return_not_equal;
__ bind(&return_not_equal);
__ Ret();
__ bind(&first_non_object);
// Check for oddballs: true, false, null, undefined.
__ CmpP(r4, Operand(ODDBALL_TYPE));
__ beq(&return_not_equal);
__ CompareObjectType(lhs, r5, r5, FIRST_JS_RECEIVER_TYPE);
__ bge(&return_not_equal);
// Check for oddballs: true, false, null, undefined.
__ CmpP(r5, Operand(ODDBALL_TYPE));
__ beq(&return_not_equal);
// Now that we have the types we might as well check for
// internalized-internalized.
STATIC_ASSERT(kInternalizedTag == 0 && kStringTag == 0);
__ OrP(r4, r4, r5);
__ AndP(r0, r4, Operand(kIsNotStringMask | kIsNotInternalizedMask));
__ beq(&return_not_equal);
}
// See comment at call site.
static void EmitCheckForTwoHeapNumbers(MacroAssembler* masm, Register lhs,
Register rhs,
Label* both_loaded_as_doubles,
Label* not_heap_numbers, Label* slow) {
DCHECK((lhs.is(r2) && rhs.is(r3)) || (lhs.is(r3) && rhs.is(r2)));
__ CompareObjectType(rhs, r5, r4, HEAP_NUMBER_TYPE);
__ bne(not_heap_numbers);
__ LoadP(r4, FieldMemOperand(lhs, HeapObject::kMapOffset));
__ CmpP(r4, r5);
__ bne(slow); // First was a heap number, second wasn't. Go slow case.
// Both are heap numbers. Load them up then jump to the code we have
// for that.
__ LoadDouble(d6, FieldMemOperand(rhs, HeapNumber::kValueOffset));
__ LoadDouble(d7, FieldMemOperand(lhs, HeapNumber::kValueOffset));
__ b(both_loaded_as_doubles);
}
// Fast negative check for internalized-to-internalized equality or receiver
// equality. Also handles the undetectable receiver to null/undefined
// comparison.
static void EmitCheckForInternalizedStringsOrObjects(MacroAssembler* masm,
Register lhs, Register rhs,
Label* possible_strings,
Label* runtime_call) {
DCHECK((lhs.is(r2) && rhs.is(r3)) || (lhs.is(r3) && rhs.is(r2)));
// r4 is object type of rhs.
Label object_test, return_equal, return_unequal, undetectable;
STATIC_ASSERT(kInternalizedTag == 0 && kStringTag == 0);
__ mov(r0, Operand(kIsNotStringMask));
__ AndP(r0, r4);
__ bne(&object_test, Label::kNear);
__ mov(r0, Operand(kIsNotInternalizedMask));
__ AndP(r0, r4);
__ bne(possible_strings);
__ CompareObjectType(lhs, r5, r5, FIRST_NONSTRING_TYPE);
__ bge(runtime_call);
__ mov(r0, Operand(kIsNotInternalizedMask));
__ AndP(r0, r5);
__ bne(possible_strings);
// Both are internalized. We already checked they weren't the same pointer so
// they are not equal. Return non-equal by returning the non-zero object
// pointer in r2.
__ Ret();
__ bind(&object_test);
__ LoadP(r4, FieldMemOperand(lhs, HeapObject::kMapOffset));
__ LoadP(r5, FieldMemOperand(rhs, HeapObject::kMapOffset));
__ LoadlB(r6, FieldMemOperand(r4, Map::kBitFieldOffset));
__ LoadlB(r7, FieldMemOperand(r5, Map::kBitFieldOffset));
__ AndP(r0, r6, Operand(1 << Map::kIsUndetectable));
__ bne(&undetectable);
__ AndP(r0, r7, Operand(1 << Map::kIsUndetectable));
__ bne(&return_unequal);
__ CompareInstanceType(r4, r4, FIRST_JS_RECEIVER_TYPE);
__ blt(runtime_call);
__ CompareInstanceType(r5, r5, FIRST_JS_RECEIVER_TYPE);
__ blt(runtime_call);
__ bind(&return_unequal);
// Return non-equal by returning the non-zero object pointer in r2.
__ Ret();
__ bind(&undetectable);
__ AndP(r0, r7, Operand(1 << Map::kIsUndetectable));
__ beq(&return_unequal);
// If both sides are JSReceivers, then the result is false according to
// the HTML specification, which says that only comparisons with null or
// undefined are affected by special casing for document.all.
__ CompareInstanceType(r4, r4, ODDBALL_TYPE);
__ beq(&return_equal);
__ CompareInstanceType(r5, r5, ODDBALL_TYPE);
__ bne(&return_unequal);
__ bind(&return_equal);
__ LoadImmP(r2, Operand(EQUAL));
__ Ret();
}
static void CompareICStub_CheckInputType(MacroAssembler* masm, Register input,
Register scratch,
CompareICState::State expected,
Label* fail) {
Label ok;
if (expected == CompareICState::SMI) {
__ JumpIfNotSmi(input, fail);
} else if (expected == CompareICState::NUMBER) {
__ JumpIfSmi(input, &ok);
__ CheckMap(input, scratch, Heap::kHeapNumberMapRootIndex, fail,
DONT_DO_SMI_CHECK);
}
// We could be strict about internalized/non-internalized here, but as long as
// hydrogen doesn't care, the stub doesn't have to care either.
__ bind(&ok);
}
// On entry r3 and r4 are the values to be compared.
// On exit r2 is 0, positive or negative to indicate the result of
// the comparison.
void CompareICStub::GenerateGeneric(MacroAssembler* masm) {
Register lhs = r3;
Register rhs = r2;
Condition cc = GetCondition();
Label miss;
CompareICStub_CheckInputType(masm, lhs, r4, left(), &miss);
CompareICStub_CheckInputType(masm, rhs, r5, right(), &miss);
Label slow; // Call builtin.
Label not_smis, both_loaded_as_doubles, lhs_not_nan;
Label not_two_smis, smi_done;
__ OrP(r4, r3, r2);
__ JumpIfNotSmi(r4, ¬_two_smis);
__ SmiUntag(r3);
__ SmiUntag(r2);
__ SubP(r2, r3, r2);
__ Ret();
__ bind(¬_two_smis);
// NOTICE! This code is only reached after a smi-fast-case check, so
// it is certain that at least one operand isn't a smi.
// Handle the case where the objects are identical. Either returns the answer
// or goes to slow. Only falls through if the objects were not identical.
EmitIdenticalObjectComparison(masm, &slow, cc);
// If either is a Smi (we know that not both are), then they can only
// be strictly equal if the other is a HeapNumber.
STATIC_ASSERT(kSmiTag == 0);
DCHECK_EQ(static_cast<Smi*>(0), Smi::kZero);
__ AndP(r4, lhs, rhs);
__ JumpIfNotSmi(r4, ¬_smis);
// One operand is a smi. EmitSmiNonsmiComparison generates code that can:
// 1) Return the answer.
// 2) Go to slow.
// 3) Fall through to both_loaded_as_doubles.
// 4) Jump to lhs_not_nan.
// In cases 3 and 4 we have found out we were dealing with a number-number
// comparison. The double values of the numbers have been loaded
// into d7 and d6.
EmitSmiNonsmiComparison(masm, lhs, rhs, &lhs_not_nan, &slow, strict());
__ bind(&both_loaded_as_doubles);
// The arguments have been converted to doubles and stored in d6 and d7
__ bind(&lhs_not_nan);
Label no_nan;
__ cdbr(d7, d6);
Label nan, equal, less_than;
__ bunordered(&nan);
__ beq(&equal, Label::kNear);
__ blt(&less_than, Label::kNear);
__ LoadImmP(r2, Operand(GREATER));
__ Ret();
__ bind(&equal);
__ LoadImmP(r2, Operand(EQUAL));
__ Ret();
__ bind(&less_than);
__ LoadImmP(r2, Operand(LESS));
__ Ret();
__ bind(&nan);
// If one of the sides was a NaN then the v flag is set. Load r2 with
// whatever it takes to make the comparison fail, since comparisons with NaN
// always fail.
if (cc == lt || cc == le) {
__ LoadImmP(r2, Operand(GREATER));
} else {
__ LoadImmP(r2, Operand(LESS));
}
__ Ret();
__ bind(¬_smis);
// At this point we know we are dealing with two different objects,
// and neither of them is a Smi. The objects are in rhs_ and lhs_.
if (strict()) {
// This returns non-equal for some object types, or falls through if it
// was not lucky.
EmitStrictTwoHeapObjectCompare(masm, lhs, rhs);
}
Label check_for_internalized_strings;
Label flat_string_check;
// Check for heap-number-heap-number comparison. Can jump to slow case,
// or load both doubles into r2, r3, r4, r5 and jump to the code that handles
// that case. If the inputs are not doubles then jumps to
// check_for_internalized_strings.
// In this case r4 will contain the type of rhs_. Never falls through.
EmitCheckForTwoHeapNumbers(masm, lhs, rhs, &both_loaded_as_doubles,
&check_for_internalized_strings,
&flat_string_check);
__ bind(&check_for_internalized_strings);
// In the strict case the EmitStrictTwoHeapObjectCompare already took care of
// internalized strings.
if (cc == eq && !strict()) {
// Returns an answer for two internalized strings or two detectable objects.
// Otherwise jumps to string case or not both strings case.
// Assumes that r4 is the type of rhs_ on entry.
EmitCheckForInternalizedStringsOrObjects(masm, lhs, rhs, &flat_string_check,
&slow);
}
// Check for both being sequential one-byte strings,
// and inline if that is the case.
__ bind(&flat_string_check);
__ JumpIfNonSmisNotBothSequentialOneByteStrings(lhs, rhs, r4, r5, &slow);
__ IncrementCounter(isolate()->counters()->string_compare_native(), 1, r4,
r5);
if (cc == eq) {
StringHelper::GenerateFlatOneByteStringEquals(masm, lhs, rhs, r4, r5);
} else {
StringHelper::GenerateCompareFlatOneByteStrings(masm, lhs, rhs, r4, r5, r6);
}
// Never falls through to here.
__ bind(&slow);
if (cc == eq) {
{
FrameAndConstantPoolScope scope(masm, StackFrame::INTERNAL);
__ Push(lhs, rhs);
__ CallRuntime(strict() ? Runtime::kStrictEqual : Runtime::kEqual);
}
// Turn true into 0 and false into some non-zero value.
STATIC_ASSERT(EQUAL == 0);
__ LoadRoot(r3, Heap::kTrueValueRootIndex);
__ SubP(r2, r2, r3);
__ Ret();
} else {
__ Push(lhs, rhs);
int ncr; // NaN compare result
if (cc == lt || cc == le) {
ncr = GREATER;
} else {
DCHECK(cc == gt || cc == ge); // remaining cases
ncr = LESS;
}
__ LoadSmiLiteral(r2, Smi::FromInt(ncr));
__ push(r2);
// Call the native; it returns -1 (less), 0 (equal), or 1 (greater)
// tagged as a small integer.
__ TailCallRuntime(Runtime::kCompare);
}
__ bind(&miss);
GenerateMiss(masm);
}
void StoreBufferOverflowStub::Generate(MacroAssembler* masm) {
// We don't allow a GC during a store buffer overflow so there is no need to
// store the registers in any particular way, but we do have to store and
// restore them.
__ MultiPush(kJSCallerSaved | r14.bit());
if (save_doubles()) {
__ MultiPushDoubles(kCallerSavedDoubles);
}
const int argument_count = 1;
const int fp_argument_count = 0;
const Register scratch = r3;
AllowExternalCallThatCantCauseGC scope(masm);
__ PrepareCallCFunction(argument_count, fp_argument_count, scratch);
__ mov(r2, Operand(ExternalReference::isolate_address(isolate())));
__ CallCFunction(ExternalReference::store_buffer_overflow_function(isolate()),
argument_count);
if (save_doubles()) {
__ MultiPopDoubles(kCallerSavedDoubles);
}
__ MultiPop(kJSCallerSaved | r14.bit());
__ Ret();
}
void StoreRegistersStateStub::Generate(MacroAssembler* masm) {
__ PushSafepointRegisters();
__ b(r14);
}
void RestoreRegistersStateStub::Generate(MacroAssembler* masm) {
__ PopSafepointRegisters();
__ b(r14);
}
void MathPowStub::Generate(MacroAssembler* masm) {
const Register exponent = MathPowTaggedDescriptor::exponent();
DCHECK(exponent.is(r4));
const DoubleRegister double_base = d1;
const DoubleRegister double_exponent = d2;
const DoubleRegister double_result = d3;
const DoubleRegister double_scratch = d0;
const Register scratch = r1;
const Register scratch2 = r9;
Label call_runtime, done, int_exponent;
if (exponent_type() == TAGGED) {
// Base is already in double_base.
__ UntagAndJumpIfSmi(scratch, exponent, &int_exponent);
__ LoadDouble(double_exponent,
FieldMemOperand(exponent, HeapNumber::kValueOffset));
}
if (exponent_type() != INTEGER) {
// Detect integer exponents stored as double.
__ TryDoubleToInt32Exact(scratch, double_exponent, scratch2,
double_scratch);
__ beq(&int_exponent, Label::kNear);
__ push(r14);
{
AllowExternalCallThatCantCauseGC scope(masm);
__ PrepareCallCFunction(0, 2, scratch);
__ MovToFloatParameters(double_base, double_exponent);
__ CallCFunction(
ExternalReference::power_double_double_function(isolate()), 0, 2);
}
__ pop(r14);
__ MovFromFloatResult(double_result);
__ b(&done);
}
// Calculate power with integer exponent.
__ bind(&int_exponent);
// Get two copies of exponent in the registers scratch and exponent.
if (exponent_type() == INTEGER) {
__ LoadRR(scratch, exponent);
} else {
// Exponent has previously been stored into scratch as untagged integer.
__ LoadRR(exponent, scratch);
}
__ ldr(double_scratch, double_base); // Back up base.
__ LoadImmP(scratch2, Operand(1));
__ ConvertIntToDouble(scratch2, double_result);
// Get absolute value of exponent.
Label positive_exponent;
__ CmpP(scratch, Operand::Zero());
__ bge(&positive_exponent, Label::kNear);
__ LoadComplementRR(scratch, scratch);
__ bind(&positive_exponent);
Label while_true, no_carry, loop_end;
__ bind(&while_true);
__ mov(scratch2, Operand(1));
__ AndP(scratch2, scratch);
__ beq(&no_carry, Label::kNear);
__ mdbr(double_result, double_scratch);
__ bind(&no_carry);
__ ShiftRightP(scratch, scratch, Operand(1));
__ LoadAndTestP(scratch, scratch);
__ beq(&loop_end, Label::kNear);
__ mdbr(double_scratch, double_scratch);
__ b(&while_true);
__ bind(&loop_end);
__ CmpP(exponent, Operand::Zero());
__ bge(&done);
// get 1/double_result:
__ ldr(double_scratch, double_result);
__ LoadImmP(scratch2, Operand(1));
__ ConvertIntToDouble(scratch2, double_result);
__ ddbr(double_result, double_scratch);
// Test whether result is zero. Bail out to check for subnormal result.
// Due to subnormals, x^-y == (1/x)^y does not hold in all cases.
__ lzdr(kDoubleRegZero);
__ cdbr(double_result, kDoubleRegZero);
__ bne(&done, Label::kNear);
// double_exponent may not containe the exponent value if the input was a
// smi. We set it with exponent value before bailing out.
__ ConvertIntToDouble(exponent, double_exponent);
// Returning or bailing out.
__ push(r14);
{
AllowExternalCallThatCantCauseGC scope(masm);
__ PrepareCallCFunction(0, 2, scratch);
__ MovToFloatParameters(double_base, double_exponent);
__ CallCFunction(
ExternalReference::power_double_double_function(isolate()), 0, 2);
}
__ pop(r14);
__ MovFromFloatResult(double_result);
__ bind(&done);
__ Ret();
}
bool CEntryStub::NeedsImmovableCode() { return true; }
void CodeStub::GenerateStubsAheadOfTime(Isolate* isolate) {
CEntryStub::GenerateAheadOfTime(isolate);
StoreBufferOverflowStub::GenerateFixedRegStubsAheadOfTime(isolate);
StubFailureTrampolineStub::GenerateAheadOfTime(isolate);
CommonArrayConstructorStub::GenerateStubsAheadOfTime(isolate);
CreateAllocationSiteStub::GenerateAheadOfTime(isolate);
CreateWeakCellStub::GenerateAheadOfTime(isolate);
BinaryOpICStub::GenerateAheadOfTime(isolate);
StoreRegistersStateStub::GenerateAheadOfTime(isolate);
RestoreRegistersStateStub::GenerateAheadOfTime(isolate);
BinaryOpICWithAllocationSiteStub::GenerateAheadOfTime(isolate);
StoreFastElementStub::GenerateAheadOfTime(isolate);
}
void StoreRegistersStateStub::GenerateAheadOfTime(Isolate* isolate) {
StoreRegistersStateStub stub(isolate);
stub.GetCode();
}
void RestoreRegistersStateStub::GenerateAheadOfTime(Isolate* isolate) {
RestoreRegistersStateStub stub(isolate);
stub.GetCode();
}
void CodeStub::GenerateFPStubs(Isolate* isolate) {
SaveFPRegsMode mode = kSaveFPRegs;
CEntryStub(isolate, 1, mode).GetCode();
StoreBufferOverflowStub(isolate, mode).GetCode();
isolate->set_fp_stubs_generated(true);
}
void CEntryStub::GenerateAheadOfTime(Isolate* isolate) {
CEntryStub stub(isolate, 1, kDontSaveFPRegs);
stub.GetCode();
}
void CEntryStub::Generate(MacroAssembler* masm) {
// Called from JavaScript; parameters are on stack as if calling JS function.
// r2: number of arguments including receiver
// r3: pointer to builtin function
// fp: frame pointer (restored after C call)
// sp: stack pointer (restored as callee's sp after C call)
// cp: current context (C callee-saved)
//
// If argv_in_register():
// r4: pointer to the first argument
ProfileEntryHookStub::MaybeCallEntryHook(masm);
__ LoadRR(r7, r3);
if (argv_in_register()) {
// Move argv into the correct register.
__ LoadRR(r3, r4);
} else {
// Compute the argv pointer.
__ ShiftLeftP(r3, r2, Operand(kPointerSizeLog2));
__ lay(r3, MemOperand(r3, sp, -kPointerSize));
}
// Enter the exit frame that transitions from JavaScript to C++.
FrameScope scope(masm, StackFrame::MANUAL);
// Need at least one extra slot for return address location.
int arg_stack_space = 1;
// Pass buffer for return value on stack if necessary
bool needs_return_buffer =
result_size() > 2 ||
(result_size() == 2 && !ABI_RETURNS_OBJECTPAIR_IN_REGS);
if (needs_return_buffer) {
arg_stack_space += result_size();
}
#if V8_TARGET_ARCH_S390X
// 64-bit linux pass Argument object by reference not value
arg_stack_space += 2;
#endif
__ EnterExitFrame(save_doubles(), arg_stack_space, is_builtin_exit()
? StackFrame::BUILTIN_EXIT
: StackFrame::EXIT);
// Store a copy of argc, argv in callee-saved registers for later.
__ LoadRR(r6, r2);
__ LoadRR(r8, r3);
// r2, r6: number of arguments including receiver (C callee-saved)
// r3, r8: pointer to the first argument
// r7: pointer to builtin function (C callee-saved)
// Result returned in registers or stack, depending on result size and ABI.
Register isolate_reg = r4;
if (needs_return_buffer) {
// The return value is 16-byte non-scalar value.
// Use frame storage reserved by calling function to pass return
// buffer as implicit first argument in R2. Shfit original parameters
// by one register each.
__ LoadRR(r4, r3);
__ LoadRR(r3, r2);
__ la(r2, MemOperand(sp, (kStackFrameExtraParamSlot + 1) * kPointerSize));
isolate_reg = r5;
}
// Call C built-in.
__ mov(isolate_reg, Operand(ExternalReference::isolate_address(isolate())));
Register target = r7;
// To let the GC traverse the return address of the exit frames, we need to
// know where the return address is. The CEntryStub is unmovable, so
// we can store the address on the stack to be able to find it again and
// we never have to restore it, because it will not change.
{
Label return_label;
__ larl(r14, &return_label); // Generate the return addr of call later.
__ StoreP(r14, MemOperand(sp, kStackFrameRASlot * kPointerSize));
// zLinux ABI requires caller's frame to have sufficient space for callee
// preserved regsiter save area.
// __ lay(sp, MemOperand(sp, -kCalleeRegisterSaveAreaSize));
__ b(target);
__ bind(&return_label);
// __ la(sp, MemOperand(sp, +kCalleeRegisterSaveAreaSize));
}
// If return value is on the stack, pop it to registers.
if (needs_return_buffer) {
if (result_size() > 2) __ LoadP(r4, MemOperand(r2, 2 * kPointerSize));
__ LoadP(r3, MemOperand(r2, kPointerSize));
__ LoadP(r2, MemOperand(r2));
}
// Check result for exception sentinel.
Label exception_returned;
__ CompareRoot(r2, Heap::kExceptionRootIndex);
__ beq(&exception_returned, Label::kNear);
// Check that there is no pending exception, otherwise we
// should have returned the exception sentinel.
if (FLAG_debug_code) {
Label okay;
ExternalReference pending_exception_address(
Isolate::kPendingExceptionAddress, isolate());
__ mov(r1, Operand(pending_exception_address));
__ LoadP(r1, MemOperand(r1));
__ CompareRoot(r1, Heap::kTheHoleValueRootIndex);
// Cannot use check here as it attempts to generate call into runtime.
__ beq(&okay, Label::kNear);
__ stop("Unexpected pending exception");
__ bind(&okay);
}
// Exit C frame and return.
// r2:r3: result
// sp: stack pointer
// fp: frame pointer
Register argc;
if (argv_in_register()) {
// We don't want to pop arguments so set argc to no_reg.
argc = no_reg;
} else {
// r6: still holds argc (callee-saved).
argc = r6;
}
__ LeaveExitFrame(save_doubles(), argc, true);
__ b(r14);
// Handling of exception.
__ bind(&exception_returned);
ExternalReference pending_handler_context_address(
Isolate::kPendingHandlerContextAddress, isolate());
ExternalReference pending_handler_code_address(
Isolate::kPendingHandlerCodeAddress, isolate());
ExternalReference pending_handler_offset_address(
Isolate::kPendingHandlerOffsetAddress, isolate());
ExternalReference pending_handler_fp_address(
Isolate::kPendingHandlerFPAddress, isolate());
ExternalReference pending_handler_sp_address(
Isolate::kPendingHandlerSPAddress, isolate());
// Ask the runtime for help to determine the handler. This will set r3 to
// contain the current pending exception, don't clobber it.
ExternalReference find_handler(Runtime::kUnwindAndFindExceptionHandler,
isolate());
{
FrameScope scope(masm, StackFrame::MANUAL);
__ PrepareCallCFunction(3, 0, r2);
__ LoadImmP(r2, Operand::Zero());
__ LoadImmP(r3, Operand::Zero());
__ mov(r4, Operand(ExternalReference::isolate_address(isolate())));
__ CallCFunction(find_handler, 3);
}
// Retrieve the handler context, SP and FP.
__ mov(cp, Operand(pending_handler_context_address));
__ LoadP(cp, MemOperand(cp));
__ mov(sp, Operand(pending_handler_sp_address));
__ LoadP(sp, MemOperand(sp));
__ mov(fp, Operand(pending_handler_fp_address));
__ LoadP(fp, MemOperand(fp));
// If the handler is a JS frame, restore the context to the frame. Note that
// the context will be set to (cp == 0) for non-JS frames.
Label skip;
__ CmpP(cp, Operand::Zero());
__ beq(&skip, Label::kNear);
__ StoreP(cp, MemOperand(fp, StandardFrameConstants::kContextOffset));
__ bind(&skip);
// Compute the handler entry address and jump to it.
__ mov(r3, Operand(pending_handler_code_address));
__ LoadP(r3, MemOperand(r3));
__ mov(r4, Operand(pending_handler_offset_address));
__ LoadP(r4, MemOperand(r4));
__ AddP(r3, r3, Operand(Code::kHeaderSize - kHeapObjectTag)); // Code start
__ AddP(ip, r3, r4);
__ Jump(ip);
}
void JSEntryStub::Generate(MacroAssembler* masm) {
// r2: code entry
// r3: function
// r4: receiver
// r5: argc
// r6: argv
Label invoke, handler_entry, exit;
ProfileEntryHookStub::MaybeCallEntryHook(masm);
// saving floating point registers
#if V8_TARGET_ARCH_S390X
// 64bit ABI requires f8 to f15 be saved
__ lay(sp, MemOperand(sp, -8 * kDoubleSize));
__ std(d8, MemOperand(sp));
__ std(d9, MemOperand(sp, 1 * kDoubleSize));
__ std(d10, MemOperand(sp, 2 * kDoubleSize));
__ std(d11, MemOperand(sp, 3 * kDoubleSize));
__ std(d12, MemOperand(sp, 4 * kDoubleSize));
__ std(d13, MemOperand(sp, 5 * kDoubleSize));
__ std(d14, MemOperand(sp, 6 * kDoubleSize));
__ std(d15, MemOperand(sp, 7 * kDoubleSize));
#else
// 31bit ABI requires you to store f4 and f6:
// http://refspecs.linuxbase.org/ELF/zSeries/lzsabi0_s390.html#AEN417
__ lay(sp, MemOperand(sp, -2 * kDoubleSize));
__ std(d4, MemOperand(sp));
__ std(d6, MemOperand(sp, kDoubleSize));
#endif
// zLinux ABI
// Incoming parameters:
// r2: code entry
// r3: function
// r4: receiver
// r5: argc
// r6: argv
// Requires us to save the callee-preserved registers r6-r13
// General convention is to also save r14 (return addr) and
// sp/r15 as well in a single STM/STMG
__ lay(sp, MemOperand(sp, -10 * kPointerSize));
__ StoreMultipleP(r6, sp, MemOperand(sp, 0));
// Set up the reserved register for 0.0.
// __ LoadDoubleLiteral(kDoubleRegZero, 0.0, r0);
// Push a frame with special values setup to mark it as an entry frame.
// Bad FP (-1)
// SMI Marker
// SMI Marker
// kCEntryFPAddress
// Frame type
__ lay(sp, MemOperand(sp, -5 * kPointerSize));
// Push a bad frame pointer to fail if it is used.
__ LoadImmP(r10, Operand(-1));
int marker = type();
__ LoadSmiLiteral(r9, Smi::FromInt(marker));
__ LoadSmiLiteral(r8, Smi::FromInt(marker));
// Save copies of the top frame descriptor on the stack.
__ mov(r7, Operand(ExternalReference(Isolate::kCEntryFPAddress, isolate())));
__ LoadP(r7, MemOperand(r7));
__ StoreMultipleP(r7, r10, MemOperand(sp, kPointerSize));
// Set up frame pointer for the frame to be pushed.
// Need to add kPointerSize, because sp has one extra
// frame already for the frame type being pushed later.
__ lay(fp,
MemOperand(sp, -EntryFrameConstants::kCallerFPOffset + kPointerSize));
// If this is the outermost JS call, set js_entry_sp value.
Label non_outermost_js;
ExternalReference js_entry_sp(Isolate::kJSEntrySPAddress, isolate());
__ mov(r7, Operand(ExternalReference(js_entry_sp)));
__ LoadAndTestP(r8, MemOperand(r7));
__ bne(&non_outermost_js, Label::kNear);
__ StoreP(fp, MemOperand(r7));
__ LoadSmiLiteral(ip, Smi::FromInt(StackFrame::OUTERMOST_JSENTRY_FRAME));
Label cont;
__ b(&cont, Label::kNear);
__ bind(&non_outermost_js);
__ LoadSmiLiteral(ip, Smi::FromInt(StackFrame::INNER_JSENTRY_FRAME));
__ bind(&cont);
__ StoreP(ip, MemOperand(sp)); // frame-type
// Jump to a faked try block that does the invoke, with a faked catch
// block that sets the pending exception.
__ b(&invoke, Label::kNear);
__ bind(&handler_entry);
handler_offset_ = handler_entry.pos();
// Caught exception: Store result (exception) in the pending exception
// field in the JSEnv and return a failure sentinel. Coming in here the
// fp will be invalid because the PushStackHandler below sets it to 0 to
// signal the existence of the JSEntry frame.
__ mov(ip, Operand(ExternalReference(Isolate::kPendingExceptionAddress,
isolate())));
__ StoreP(r2, MemOperand(ip));
__ LoadRoot(r2, Heap::kExceptionRootIndex);
__ b(&exit, Label::kNear);
// Invoke: Link this frame into the handler chain.
__ bind(&invoke);
// Must preserve r2-r6.
__ PushStackHandler();
// If an exception not caught by another handler occurs, this handler
// returns control to the code after the b(&invoke) above, which
// restores all kCalleeSaved registers (including cp and fp) to their
// saved values before returning a failure to C.
// Invoke the function by calling through JS entry trampoline builtin.
// Notice that we cannot store a reference to the trampoline code directly in
// this stub, because runtime stubs are not traversed when doing GC.
// Expected registers by Builtins::JSEntryTrampoline
// r2: code entry
// r3: function
// r4: receiver
// r5: argc
// r6: argv
if (type() == StackFrame::ENTRY_CONSTRUCT) {
ExternalReference construct_entry(Builtins::kJSConstructEntryTrampoline,
isolate());
__ mov(ip, Operand(construct_entry));
} else {
ExternalReference entry(Builtins::kJSEntryTrampoline, isolate());
__ mov(ip, Operand(entry));
}
__ LoadP(ip, MemOperand(ip)); // deref address
// Branch and link to JSEntryTrampoline.
// the address points to the start of the code object, skip the header
__ AddP(ip, Operand(Code::kHeaderSize - kHeapObjectTag));
Label return_addr;
// __ basr(r14, ip);
__ larl(r14, &return_addr);
__ b(ip);
__ bind(&return_addr);
// Unlink this frame from the handler chain.
__ PopStackHandler();
__ bind(&exit); // r2 holds result
// Check if the current stack frame is marked as the outermost JS frame.
Label non_outermost_js_2;
__ pop(r7);
__ CmpSmiLiteral(r7, Smi::FromInt(StackFrame::OUTERMOST_JSENTRY_FRAME), r0);
__ bne(&non_outermost_js_2, Label::kNear);
__ mov(r8, Operand::Zero());
__ mov(r7, Operand(ExternalReference(js_entry_sp)));
__ StoreP(r8, MemOperand(r7));
__ bind(&non_outermost_js_2);
// Restore the top frame descriptors from the stack.
__ pop(r5);
__ mov(ip, Operand(ExternalReference(Isolate::kCEntryFPAddress, isolate())));
__ StoreP(r5, MemOperand(ip));
// Reset the stack to the callee saved registers.
__ lay(sp, MemOperand(sp, -EntryFrameConstants::kCallerFPOffset));
// Reload callee-saved preserved regs, return address reg (r14) and sp
__ LoadMultipleP(r6, sp, MemOperand(sp, 0));
__ la(sp, MemOperand(sp, 10 * kPointerSize));
// saving floating point registers
#if V8_TARGET_ARCH_S390X
// 64bit ABI requires f8 to f15 be saved
__ ld(d8, MemOperand(sp));
__ ld(d9, MemOperand(sp, 1 * kDoubleSize));
__ ld(d10, MemOperand(sp, 2 * kDoubleSize));
__ ld(d11, MemOperand(sp, 3 * kDoubleSize));
__ ld(d12, MemOperand(sp, 4 * kDoubleSize));
__ ld(d13, MemOperand(sp, 5 * kDoubleSize));
__ ld(d14, MemOperand(sp, 6 * kDoubleSize));
__ ld(d15, MemOperand(sp, 7 * kDoubleSize));
__ la(sp, MemOperand(sp, 8 * kDoubleSize));
#else
// 31bit ABI requires you to store f4 and f6:
// http://refspecs.linuxbase.org/ELF/zSeries/lzsabi0_s390.html#AEN417
__ ld(d4, MemOperand(sp));
__ ld(d6, MemOperand(sp, kDoubleSize));
__ la(sp, MemOperand(sp, 2 * kDoubleSize));
#endif
__ b(r14);
}
void FunctionPrototypeStub::Generate(MacroAssembler* masm) {
Label miss;
Register receiver = LoadDescriptor::ReceiverRegister();
// Ensure that the vector and slot registers won't be clobbered before
// calling the miss handler.
DCHECK(!AreAliased(r6, r7, LoadWithVectorDescriptor::VectorRegister(),
LoadWithVectorDescriptor::SlotRegister()));
NamedLoadHandlerCompiler::GenerateLoadFunctionPrototype(masm, receiver, r6,
r7, &miss);
__ bind(&miss);
PropertyAccessCompiler::TailCallBuiltin(
masm, PropertyAccessCompiler::MissBuiltin(Code::LOAD_IC));
}
void LoadIndexedStringStub::Generate(MacroAssembler* masm) {
// Return address is in lr.
Label miss;
Register receiver = LoadDescriptor::ReceiverRegister();
Register index = LoadDescriptor::NameRegister();
Register scratch = r7;
Register result = r2;
DCHECK(!scratch.is(receiver) && !scratch.is(index));
DCHECK(!scratch.is(LoadWithVectorDescriptor::VectorRegister()) &&
result.is(LoadWithVectorDescriptor::SlotRegister()));
// StringCharAtGenerator doesn't use the result register until it's passed
// the different miss possibilities. If it did, we would have a conflict
// when FLAG_vector_ics is true.
StringCharAtGenerator char_at_generator(receiver, index, scratch, result,
&miss, // When not a string.
&miss, // When not a number.
&miss, // When index out of range.
RECEIVER_IS_STRING);
char_at_generator.GenerateFast(masm);
__ Ret();
StubRuntimeCallHelper call_helper;
char_at_generator.GenerateSlow(masm, PART_OF_IC_HANDLER, call_helper);
__ bind(&miss);
PropertyAccessCompiler::TailCallBuiltin(
masm, PropertyAccessCompiler::MissBuiltin(Code::KEYED_LOAD_IC));
}
void RegExpExecStub::Generate(MacroAssembler* masm) {
// Just jump directly to runtime if native RegExp is not selected at compile
// time or if regexp entry in generated code is turned off runtime switch or
// at compilation.
#ifdef V8_INTERPRETED_REGEXP
__ TailCallRuntime(Runtime::kRegExpExec);
#else // V8_INTERPRETED_REGEXP
// Stack frame on entry.
// sp[0]: last_match_info (expected JSArray)
// sp[4]: previous index
// sp[8]: subject string
// sp[12]: JSRegExp object
const int kLastMatchInfoOffset = 0 * kPointerSize;
const int kPreviousIndexOffset = 1 * kPointerSize;
const int kSubjectOffset = 2 * kPointerSize;
const int kJSRegExpOffset = 3 * kPointerSize;
Label runtime, br_over, encoding_type_UC16;
// Allocation of registers for this function. These are in callee save
// registers and will be preserved by the call to the native RegExp code, as
// this code is called using the normal C calling convention. When calling
// directly from generated code the native RegExp code will not do a GC and
// therefore the content of these registers are safe to use after the call.
Register subject = r6;
Register regexp_data = r7;
Register last_match_info_elements = r8;
Register code = r9;
__ CleanseP(r14);
// Ensure register assigments are consistent with callee save masks
DCHECK(subject.bit() & kCalleeSaved);
DCHECK(regexp_data.bit() & kCalleeSaved);
DCHECK(last_match_info_elements.bit() & kCalleeSaved);
DCHECK(code.bit() & kCalleeSaved);
// Ensure that a RegExp stack is allocated.
ExternalReference address_of_regexp_stack_memory_address =
ExternalReference::address_of_regexp_stack_memory_address(isolate());
ExternalReference address_of_regexp_stack_memory_size =
ExternalReference::address_of_regexp_stack_memory_size(isolate());
__ mov(r2, Operand(address_of_regexp_stack_memory_size));
__ LoadAndTestP(r2, MemOperand(r2));
__ beq(&runtime);
// Check that the first argument is a JSRegExp object.
__ LoadP(r2, MemOperand(sp, kJSRegExpOffset));
__ JumpIfSmi(r2, &runtime);
__ CompareObjectType(r2, r3, r3, JS_REGEXP_TYPE);
__ bne(&runtime);
// Check that the RegExp has been compiled (data contains a fixed array).
__ LoadP(regexp_data, FieldMemOperand(r2, JSRegExp::kDataOffset));
if (FLAG_debug_code) {
__ TestIfSmi(regexp_data);
__ Check(ne, kUnexpectedTypeForRegExpDataFixedArrayExpected, cr0);
__ CompareObjectType(regexp_data, r2, r2, FIXED_ARRAY_TYPE);
__ Check(eq, kUnexpectedTypeForRegExpDataFixedArrayExpected);
}
// regexp_data: RegExp data (FixedArray)
// Check the type of the RegExp. Only continue if type is JSRegExp::IRREGEXP.
__ LoadP(r2, FieldMemOperand(regexp_data, JSRegExp::kDataTagOffset));
// DCHECK(Smi::FromInt(JSRegExp::IRREGEXP) < (char *)0xffffu);
__ CmpSmiLiteral(r2, Smi::FromInt(JSRegExp::IRREGEXP), r0);
__ bne(&runtime);
// regexp_data: RegExp data (FixedArray)
// Check that the number of captures fit in the static offsets vector buffer.
__ LoadP(r4,
FieldMemOperand(regexp_data, JSRegExp::kIrregexpCaptureCountOffset));
// Check (number_of_captures + 1) * 2 <= offsets vector size
// Or number_of_captures * 2 <= offsets vector size - 2
// SmiToShortArrayOffset accomplishes the multiplication by 2 and
// SmiUntag (which is a nop for 32-bit).
__ SmiToShortArrayOffset(r4, r4);
STATIC_ASSERT(Isolate::kJSRegexpStaticOffsetsVectorSize >= 2);
__ CmpLogicalP(r4, Operand(Isolate::kJSRegexpStaticOffsetsVectorSize - 2));
__ bgt(&runtime);
// Reset offset for possibly sliced string.
__ LoadImmP(ip, Operand::Zero());
__ LoadP(subject, MemOperand(sp, kSubjectOffset));
__ JumpIfSmi(subject, &runtime);
__ LoadRR(r5, subject); // Make a copy of the original subject string.
// subject: subject string
// r5: subject string
// regexp_data: RegExp data (FixedArray)
// Handle subject string according to its encoding and representation:
// (1) Sequential string? If yes, go to (4).
// (2) Sequential or cons? If not, go to (5).
// (3) Cons string. If the string is flat, replace subject with first string
// and go to (1). Otherwise bail out to runtime.
// (4) Sequential string. Load regexp code according to encoding.
// (E) Carry on.
/// [...]
// Deferred code at the end of the stub:
// (5) Long external string? If not, go to (7).
// (6) External string. Make it, offset-wise, look like a sequential string.
// Go to (4).
// (7) Short external string or not a string? If yes, bail out to runtime.
// (8) Sliced string. Replace subject with parent. Go to (1).
Label seq_string /* 4 */, external_string /* 6 */, check_underlying /* 1 */,
not_seq_nor_cons /* 5 */, not_long_external /* 7 */;
__ bind(&check_underlying);
__ LoadP(r2, FieldMemOperand(subject, HeapObject::kMapOffset));
__ LoadlB(r2, FieldMemOperand(r2, Map::kInstanceTypeOffset));
// (1) Sequential string? If yes, go to (4).
STATIC_ASSERT((kIsNotStringMask | kStringRepresentationMask |
kShortExternalStringMask) == 0x93);
__ mov(r3, Operand(kIsNotStringMask | kStringRepresentationMask |
kShortExternalStringMask));
__ AndP(r3, r2);
STATIC_ASSERT((kStringTag | kSeqStringTag) == 0);
__ beq(&seq_string, Label::kNear); // Go to (4).
// (2) Sequential or cons? If not, go to (5).
STATIC_ASSERT(kConsStringTag < kExternalStringTag);
STATIC_ASSERT(kSlicedStringTag > kExternalStringTag);
STATIC_ASSERT(kIsNotStringMask > kExternalStringTag);
STATIC_ASSERT(kShortExternalStringTag > kExternalStringTag);
STATIC_ASSERT(kExternalStringTag < 0xffffu);
__ CmpP(r3, Operand(kExternalStringTag));
__ bge(¬_seq_nor_cons); // Go to (5).
// (3) Cons string. Check that it's flat.
// Replace subject with first string and reload instance type.
__ LoadP(r2, FieldMemOperand(subject, ConsString::kSecondOffset));
__ CompareRoot(r2, Heap::kempty_stringRootIndex);
__ bne(&runtime);
__ LoadP(subject, FieldMemOperand(subject, ConsString::kFirstOffset));
__ b(&check_underlying);
// (4) Sequential string. Load regexp code according to encoding.
__ bind(&seq_string);
// subject: sequential subject string (or look-alike, external string)
// r5: original subject string
// Load previous index and check range before r5 is overwritten. We have to
// use r5 instead of subject here because subject might have been only made
// to look like a sequential string when it actually is an external string.
__ LoadP(r3, MemOperand(sp, kPreviousIndexOffset));
__ JumpIfNotSmi(r3, &runtime);
__ LoadP(r5, FieldMemOperand(r5, String::kLengthOffset));
__ CmpLogicalP(r5, r3);
__ ble(&runtime);
__ SmiUntag(r3);
STATIC_ASSERT(4 == kOneByteStringTag);
STATIC_ASSERT(kTwoByteStringTag == 0);
STATIC_ASSERT(kStringEncodingMask == 4);
__ ExtractBitMask(r5, r2, kStringEncodingMask, SetRC);
__ beq(&encoding_type_UC16, Label::kNear);
__ LoadP(code,
FieldMemOperand(regexp_data, JSRegExp::kDataOneByteCodeOffset));
__ b(&br_over, Label::kNear);
__ bind(&encoding_type_UC16);
__ LoadP(code, FieldMemOperand(regexp_data, JSRegExp::kDataUC16CodeOffset));
__ bind(&br_over);
// (E) Carry on. String handling is done.
// code: irregexp code
// Check that the irregexp code has been generated for the actual string
// encoding. If it has, the field contains a code object otherwise it contains
// a smi (code flushing support).
__ JumpIfSmi(code, &runtime);
// r3: previous index
// r5: encoding of subject string (1 if one_byte, 0 if two_byte);
// code: Address of generated regexp code
// subject: Subject string
// regexp_data: RegExp data (FixedArray)
// All checks done. Now push arguments for native regexp code.
__ IncrementCounter(isolate()->counters()->regexp_entry_native(), 1, r2, r4);
// Isolates: note we add an additional parameter here (isolate pointer).
const int kRegExpExecuteArguments = 10;
const int kParameterRegisters = 5;
__ EnterExitFrame(false, kRegExpExecuteArguments - kParameterRegisters);
// Stack pointer now points to cell where return address is to be written.
// Arguments are before that on the stack or in registers.
// Argument 10 (in stack parameter area): Pass current isolate address.
__ mov(r2, Operand(ExternalReference::isolate_address(isolate())));
__ StoreP(r2, MemOperand(sp, kStackFrameExtraParamSlot * kPointerSize +
4 * kPointerSize));
// Argument 9 is a dummy that reserves the space used for
// the return address added by the ExitFrame in native calls.
__ mov(r2, Operand::Zero());
__ StoreP(r2, MemOperand(sp, kStackFrameExtraParamSlot * kPointerSize +
3 * kPointerSize));
// Argument 8: Indicate that this is a direct call from JavaScript.
__ mov(r2, Operand(1));
__ StoreP(r2, MemOperand(sp, kStackFrameExtraParamSlot * kPointerSize +
2 * kPointerSize));
// Argument 7: Start (high end) of backtracking stack memory area.
__ mov(r2, Operand(address_of_regexp_stack_memory_address));
__ LoadP(r2, MemOperand(r2, 0));
__ mov(r1, Operand(address_of_regexp_stack_memory_size));
__ LoadP(r1, MemOperand(r1, 0));
__ AddP(r2, r1);
__ StoreP(r2, MemOperand(sp, kStackFrameExtraParamSlot * kPointerSize +
1 * kPointerSize));
// Argument 6: Set the number of capture registers to zero to force
// global egexps to behave as non-global. This does not affect non-global
// regexps.
__ mov(r2, Operand::Zero());
__ StoreP(r2, MemOperand(sp, kStackFrameExtraParamSlot * kPointerSize +
0 * kPointerSize));
// Argument 1 (r2): Subject string.
// Load the length from the original subject string from the previous stack
// frame. Therefore we have to use fp, which points exactly to 15 pointer
// sizes below the previous sp. (Because creating a new stack frame pushes
// the previous fp onto the stack and moves up sp by 2 * kPointerSize and
// 13 registers saved on the stack previously)
__ LoadP(r2, MemOperand(fp, kSubjectOffset + 2 * kPointerSize));
// Argument 2 (r3): Previous index.
// Already there
__ AddP(r1, subject, Operand(SeqString::kHeaderSize - kHeapObjectTag));
// Argument 5 (r6): static offsets vector buffer.
__ mov(
r6,
Operand(ExternalReference::address_of_static_offsets_vector(isolate())));
// For arguments 4 (r5) and 3 (r4) get string length, calculate start of data
// and calculate the shift of the index (0 for one-byte and 1 for two byte).
__ XorP(r5, Operand(1));
// If slice offset is not 0, load the length from the original sliced string.
// Argument 3, r4: Start of string data
// Prepare start and end index of the input.
__ ShiftLeftP(ip, ip, r5);
__ AddP(ip, r1, ip);
__ ShiftLeftP(r4, r3, r5);
__ AddP(r4, ip, r4);
// Argument 4, r5: End of string data
__ LoadP(r1, FieldMemOperand(r2, String::kLengthOffset));
__ SmiUntag(r1);
__ ShiftLeftP(r0, r1, r5);
__ AddP(r5, ip, r0);
// Locate the code entry and call it.
__ AddP(code, Operand(Code::kHeaderSize - kHeapObjectTag));
DirectCEntryStub stub(isolate());
stub.GenerateCall(masm, code);
__ LeaveExitFrame(false, no_reg, true);
// r2: result (int32)
// subject: subject string -- needed to reload
__ LoadP(subject, MemOperand(sp, kSubjectOffset));
// regexp_data: RegExp data (callee saved)
// last_match_info_elements: Last match info elements (callee saved)
// Check the result.
Label success;
__ Cmp32(r2, Operand(1));
// We expect exactly one result since we force the called regexp to behave
// as non-global.
__ beq(&success);
Label failure;
__ Cmp32(r2, Operand(NativeRegExpMacroAssembler::FAILURE));
__ beq(&failure);
__ Cmp32(r2, Operand(NativeRegExpMacroAssembler::EXCEPTION));
// If not exception it can only be retry. Handle that in the runtime system.
__ bne(&runtime);
// Result must now be exception. If there is no pending exception already a
// stack overflow (on the backtrack stack) was detected in RegExp code but
// haven't created the exception yet. Handle that in the runtime system.
// TODO(592): Rerunning the RegExp to get the stack overflow exception.
__ mov(r3, Operand(isolate()->factory()->the_hole_value()));
__ mov(r4, Operand(ExternalReference(Isolate::kPendingExceptionAddress,
isolate())));
__ LoadP(r2, MemOperand(r4, 0));
__ CmpP(r2, r3);
__ beq(&runtime);
// For exception, throw the exception again.
__ TailCallRuntime(Runtime::kRegExpExecReThrow);
__ bind(&failure);
// For failure and exception return null.
__ mov(r2, Operand(isolate()->factory()->null_value()));
__ la(sp, MemOperand(sp, (4 * kPointerSize)));
__ Ret();
// Process the result from the native regexp code.
__ bind(&success);
__ LoadP(r3,
FieldMemOperand(regexp_data, JSRegExp::kIrregexpCaptureCountOffset));
// Calculate number of capture registers (number_of_captures + 1) * 2.
// SmiToShortArrayOffset accomplishes the multiplication by 2 and
// SmiUntag (which is a nop for 32-bit).
__ SmiToShortArrayOffset(r3, r3);
__ AddP(r3, Operand(2));
// Check that the last match info is a FixedArray.
__ LoadP(last_match_info_elements, MemOperand(sp, kLastMatchInfoOffset));
__ JumpIfSmi(last_match_info_elements, &runtime);
// Check that the object has fast elements.
__ LoadP(r2,
FieldMemOperand(last_match_info_elements, HeapObject::kMapOffset));
__ CompareRoot(r2, Heap::kFixedArrayMapRootIndex);
__ bne(&runtime);
// Check that the last match info has space for the capture registers and the
// additional information.
__ LoadP(
r2, FieldMemOperand(last_match_info_elements, FixedArray::kLengthOffset));
__ AddP(r4, r3, Operand(RegExpMatchInfo::kLastMatchOverhead));
__ SmiUntag(r0, r2);
__ CmpP(r4, r0);
__ bgt(&runtime);
// r3: number of capture registers
// subject: subject string
// Store the capture count.
__ SmiTag(r4, r3);
__ StoreP(r4, FieldMemOperand(last_match_info_elements,
RegExpMatchInfo::kNumberOfCapturesOffset));
// Store last subject and last input.
__ StoreP(subject, FieldMemOperand(last_match_info_elements,
RegExpMatchInfo::kLastSubjectOffset));
__ LoadRR(r4, subject);
__ RecordWriteField(last_match_info_elements,
RegExpMatchInfo::kLastSubjectOffset, subject, r9,
kLRHasNotBeenSaved, kDontSaveFPRegs);
__ LoadRR(subject, r4);
__ StoreP(subject, FieldMemOperand(last_match_info_elements,
RegExpMatchInfo::kLastInputOffset));
__ RecordWriteField(last_match_info_elements,
RegExpMatchInfo::kLastInputOffset, subject, r9,
kLRHasNotBeenSaved, kDontSaveFPRegs);
// Get the static offsets vector filled by the native regexp code.
ExternalReference address_of_static_offsets_vector =
ExternalReference::address_of_static_offsets_vector(isolate());
__ mov(r4, Operand(address_of_static_offsets_vector));
// r3: number of capture registers
// r4: offsets vector
Label next_capture;
// Capture register counter starts from number of capture registers and
// counts down until wrapping after zero.
__ AddP(r2, last_match_info_elements,
Operand(RegExpMatchInfo::kFirstCaptureOffset - kHeapObjectTag -
kPointerSize));
__ AddP(r4, Operand(-kIntSize)); // bias down for lwzu
__ bind(&next_capture);
// Read the value from the static offsets vector buffer.
__ ly(r5, MemOperand(r4, kIntSize));
__ lay(r4, MemOperand(r4, kIntSize));
// Store the smi value in the last match info.
__ SmiTag(r5);
__ StoreP(r5, MemOperand(r2, kPointerSize));
__ lay(r2, MemOperand(r2, kPointerSize));
__ BranchOnCount(r3, &next_capture);
// Return last match info.
__ LoadRR(r2, last_match_info_elements);
__ la(sp, MemOperand(sp, (4 * kPointerSize)));
__ Ret();
// Do the runtime call to execute the regexp.
__ bind(&runtime);
__ TailCallRuntime(Runtime::kRegExpExec);
// Deferred code for string handling.
// (5) Long external string? If not, go to (7).
__ bind(¬_seq_nor_cons);
// Compare flags are still set.
__ bgt(¬_long_external, Label::kNear); // Go to (7).
// (6) External string. Make it, offset-wise, look like a sequential string.
__ bind(&external_string);
__ LoadP(r2, FieldMemOperand(subject, HeapObject::kMapOffset));
__ LoadlB(r2, FieldMemOperand(r2, Map::kInstanceTypeOffset));
if (FLAG_debug_code) {
// Assert that we do not have a cons or slice (indirect strings) here.
// Sequential strings have already been ruled out.
STATIC_ASSERT(kIsIndirectStringMask == 1);
__ tmll(r2, Operand(kIsIndirectStringMask));
__ Assert(eq, kExternalStringExpectedButNotFound, cr0);
}
__ LoadP(subject,
FieldMemOperand(subject, ExternalString::kResourceDataOffset));
// Move the pointer so that offset-wise, it looks like a sequential string.
STATIC_ASSERT(SeqTwoByteString::kHeaderSize == SeqOneByteString::kHeaderSize);
__ SubP(subject, subject,
Operand(SeqTwoByteString::kHeaderSize - kHeapObjectTag));
__ b(&seq_string); // Go to (4).
// (7) Short external string or not a string? If yes, bail out to runtime.
__ bind(¬_long_external);
STATIC_ASSERT(kNotStringTag != 0 && kShortExternalStringTag != 0);
__ mov(r0, Operand(kIsNotStringMask | kShortExternalStringMask));
__ AndP(r0, r3);
__ bne(&runtime);
// (8) Sliced string. Replace subject with parent. Go to (4).
// Load offset into ip and replace subject string with parent.
__ LoadP(ip, FieldMemOperand(subject, SlicedString::kOffsetOffset));
__ SmiUntag(ip);
__ LoadP(subject, FieldMemOperand(subject, SlicedString::kParentOffset));
__ b(&check_underlying); // Go to (4).
#endif // V8_INTERPRETED_REGEXP
}
static void CallStubInRecordCallTarget(MacroAssembler* masm, CodeStub* stub) {
// r2 : number of arguments to the construct function
// r3 : the function to call
// r4 : feedback vector
// r5 : slot in feedback vector (Smi)
FrameScope scope(masm, StackFrame::INTERNAL);
// Number-of-arguments register must be smi-tagged to call out.
__ SmiTag(r2);
__ Push(r5, r4, r3, r2);
__ Push(cp);
__ CallStub(stub);
__ Pop(cp);
__ Pop(r5, r4, r3, r2);
__ SmiUntag(r2);
}
static void GenerateRecordCallTarget(MacroAssembler* masm) {
// Cache the called function in a feedback vector slot. Cache states
// are uninitialized, monomorphic (indicated by a JSFunction), and
// megamorphic.
// r2 : number of arguments to the construct function
// r3 : the function to call
// r4 : feedback vector
// r5 : slot in feedback vector (Smi)
Label initialize, done, miss, megamorphic, not_array_function;
DCHECK_EQ(*TypeFeedbackVector::MegamorphicSentinel(masm->isolate()),
masm->isolate()->heap()->megamorphic_symbol());
DCHECK_EQ(*TypeFeedbackVector::UninitializedSentinel(masm->isolate()),
masm->isolate()->heap()->uninitialized_symbol());
const int count_offset = FixedArray::kHeaderSize + kPointerSize;
// Load the cache state into r7.
__ SmiToPtrArrayOffset(r7, r5);
__ AddP(r7, r4, r7);
__ LoadP(r7, FieldMemOperand(r7, FixedArray::kHeaderSize));
// A monomorphic cache hit or an already megamorphic state: invoke the
// function without changing the state.
// We don't know if r7 is a WeakCell or a Symbol, but it's harmless to read at
// this position in a symbol (see static asserts in type-feedback-vector.h).
Label check_allocation_site;
Register feedback_map = r8;
Register weak_value = r9;
__ LoadP(weak_value, FieldMemOperand(r7, WeakCell::kValueOffset));
__ CmpP(r3, weak_value);
__ beq(&done, Label::kNear);
__ CompareRoot(r7, Heap::kmegamorphic_symbolRootIndex);
__ beq(&done, Label::kNear);
__ LoadP(feedback_map, FieldMemOperand(r7, HeapObject::kMapOffset));
__ CompareRoot(feedback_map, Heap::kWeakCellMapRootIndex);
__ bne(&check_allocation_site);
// If the weak cell is cleared, we have a new chance to become monomorphic.
__ JumpIfSmi(weak_value, &initialize);
__ b(&megamorphic);
__ bind(&check_allocation_site);
// If we came here, we need to see if we are the array function.
// If we didn't have a matching function, and we didn't find the megamorph
// sentinel, then we have in the slot either some other function or an
// AllocationSite.
__ CompareRoot(feedback_map, Heap::kAllocationSiteMapRootIndex);
__ bne(&miss);
// Make sure the function is the Array() function
__ LoadNativeContextSlot(Context::ARRAY_FUNCTION_INDEX, r7);
__ CmpP(r3, r7);
__ bne(&megamorphic);
__ b(&done, Label::kNear);
__ bind(&miss);
// A monomorphic miss (i.e, here the cache is not uninitialized) goes
// megamorphic.
__ CompareRoot(r7, Heap::kuninitialized_symbolRootIndex);
__ beq(&initialize);
// MegamorphicSentinel is an immortal immovable object (undefined) so no
// write-barrier is needed.
__ bind(&megamorphic);
__ SmiToPtrArrayOffset(r7, r5);
__ AddP(r7, r4, r7);
__ LoadRoot(ip, Heap::kmegamorphic_symbolRootIndex);
__ StoreP(ip, FieldMemOperand(r7, FixedArray::kHeaderSize), r0);
__ jmp(&done);
// An uninitialized cache is patched with the function
__ bind(&initialize);
// Make sure the function is the Array() function.
__ LoadNativeContextSlot(Context::ARRAY_FUNCTION_INDEX, r7);
__ CmpP(r3, r7);
__ bne(¬_array_function);
// The target function is the Array constructor,
// Create an AllocationSite if we don't already have it, store it in the
// slot.
CreateAllocationSiteStub create_stub(masm->isolate());
CallStubInRecordCallTarget(masm, &create_stub);
__ b(&done, Label::kNear);
__ bind(¬_array_function);
CreateWeakCellStub weak_cell_stub(masm->isolate());
CallStubInRecordCallTarget(masm, &weak_cell_stub);
__ bind(&done);
// Increment the call count for all function calls.
__ SmiToPtrArrayOffset(r7, r5);
__ AddP(r7, r4, r7);
__ LoadP(r6, FieldMemOperand(r7, count_offset));
__ AddSmiLiteral(r6, r6, Smi::FromInt(1), r0);
__ StoreP(r6, FieldMemOperand(r7, count_offset), r0);
}
void CallConstructStub::Generate(MacroAssembler* masm) {
// r2 : number of arguments
// r3 : the function to call
// r4 : feedback vector
// r5 : slot in feedback vector (Smi, for RecordCallTarget)
Label non_function;
// Check that the function is not a smi.
__ JumpIfSmi(r3, &non_function);
// Check that the function is a JSFunction.
__ CompareObjectType(r3, r7, r7, JS_FUNCTION_TYPE);
__ bne(&non_function);
GenerateRecordCallTarget(masm);
__ SmiToPtrArrayOffset(r7, r5);
__ AddP(r7, r4, r7);
// Put the AllocationSite from the feedback vector into r4, or undefined.
__ LoadP(r4, FieldMemOperand(r7, FixedArray::kHeaderSize));
__ LoadP(r7, FieldMemOperand(r4, AllocationSite::kMapOffset));
__ CompareRoot(r7, Heap::kAllocationSiteMapRootIndex);
Label feedback_register_initialized;
__ beq(&feedback_register_initialized);
__ LoadRoot(r4, Heap::kUndefinedValueRootIndex);
__ bind(&feedback_register_initialized);
__ AssertUndefinedOrAllocationSite(r4, r7);
// Pass function as new target.
__ LoadRR(r5, r3);
// Tail call to the function-specific construct stub (still in the caller
// context at this point).
__ LoadP(r6, FieldMemOperand(r3, JSFunction::kSharedFunctionInfoOffset));
__ LoadP(r6, FieldMemOperand(r6, SharedFunctionInfo::kConstructStubOffset));
__ AddP(ip, r6, Operand(Code::kHeaderSize - kHeapObjectTag));
__ JumpToJSEntry(ip);
__ bind(&non_function);
__ LoadRR(r5, r3);
__ Jump(isolate()->builtins()->Construct(), RelocInfo::CODE_TARGET);
}
// Note: feedback_vector and slot are clobbered after the call.
static void IncrementCallCount(MacroAssembler* masm, Register feedback_vector,
Register slot, Register temp) {
const int count_offset = FixedArray::kHeaderSize + kPointerSize;
__ SmiToPtrArrayOffset(temp, slot);
__ AddP(feedback_vector, feedback_vector, temp);
__ LoadP(slot, FieldMemOperand(feedback_vector, count_offset));
__ AddSmiLiteral(slot, slot, Smi::FromInt(1), temp);
__ StoreP(slot, FieldMemOperand(feedback_vector, count_offset), temp);
}
void CallICStub::HandleArrayCase(MacroAssembler* masm, Label* miss) {
// r2 - number of arguments
// r3 - function
// r5 - slot id
// r4 - vector
// r6 - allocation site (loaded from vector[slot])
__ LoadNativeContextSlot(Context::ARRAY_FUNCTION_INDEX, r7);
__ CmpP(r3, r7);
__ bne(miss);
// Increment the call count for monomorphic function calls.
IncrementCallCount(masm, r4, r5, r1);
__ LoadRR(r4, r6);
__ LoadRR(r5, r3);
ArrayConstructorStub stub(masm->isolate());
__ TailCallStub(&stub);
}
void CallICStub::Generate(MacroAssembler* masm) {
// r2 - number of arguments
// r3 - function
// r5 - slot id (Smi)
// r4 - vector
Label extra_checks_or_miss, call, call_function, call_count_incremented;
// The checks. First, does r3 match the recorded monomorphic target?
__ SmiToPtrArrayOffset(r8, r5);
__ AddP(r8, r4, r8);
__ LoadP(r6, FieldMemOperand(r8, FixedArray::kHeaderSize));
// We don't know that we have a weak cell. We might have a private symbol
// or an AllocationSite, but the memory is safe to examine.
// AllocationSite::kTransitionInfoOffset - contains a Smi or pointer to
// FixedArray.
// WeakCell::kValueOffset - contains a JSFunction or Smi(0)
// Symbol::kHashFieldSlot - if the low bit is 1, then the hash is not
// computed, meaning that it can't appear to be a pointer. If the low bit is
// 0, then hash is computed, but the 0 bit prevents the field from appearing
// to be a pointer.
STATIC_ASSERT(WeakCell::kSize >= kPointerSize);
STATIC_ASSERT(AllocationSite::kTransitionInfoOffset ==
WeakCell::kValueOffset &&
WeakCell::kValueOffset == Symbol::kHashFieldSlot);
__ LoadP(r7, FieldMemOperand(r6, WeakCell::kValueOffset));
__ CmpP(r3, r7);
__ bne(&extra_checks_or_miss, Label::kNear);
// The compare above could have been a SMI/SMI comparison. Guard against this
// convincing us that we have a monomorphic JSFunction.
__ JumpIfSmi(r3, &extra_checks_or_miss);
__ bind(&call_function);
// Increment the call count for monomorphic function calls.
IncrementCallCount(masm, r4, r5, r1);
__ Jump(masm->isolate()->builtins()->CallFunction(convert_mode(),
tail_call_mode()),
RelocInfo::CODE_TARGET);
__ bind(&extra_checks_or_miss);
Label uninitialized, miss, not_allocation_site;
__ CompareRoot(r6, Heap::kmegamorphic_symbolRootIndex);
__ beq(&call);
// Verify that r6 contains an AllocationSite
__ LoadP(r7, FieldMemOperand(r6, HeapObject::kMapOffset));
__ CompareRoot(r7, Heap::kAllocationSiteMapRootIndex);
__ bne(¬_allocation_site);
// We have an allocation site.
HandleArrayCase(masm, &miss);
__ bind(¬_allocation_site);
// The following cases attempt to handle MISS cases without going to the
// runtime.
if (FLAG_trace_ic) {
__ b(&miss);
}
__ CompareRoot(r6, Heap::kuninitialized_symbolRootIndex);
__ beq(&uninitialized);
// We are going megamorphic. If the feedback is a JSFunction, it is fine
// to handle it here. More complex cases are dealt with in the runtime.
__ AssertNotSmi(r6);
__ CompareObjectType(r6, r7, r7, JS_FUNCTION_TYPE);
__ bne(&miss);
__ LoadRoot(ip, Heap::kmegamorphic_symbolRootIndex);
__ StoreP(ip, FieldMemOperand(r8, FixedArray::kHeaderSize), r0);
__ bind(&call);
// Increment the call count for megamorphic function calls.
IncrementCallCount(masm, r4, r5, r1);
__ bind(&call_count_incremented);
__ Jump(masm->isolate()->builtins()->Call(convert_mode(), tail_call_mode()),
RelocInfo::CODE_TARGET);
__ bind(&uninitialized);
// We are going monomorphic, provided we actually have a JSFunction.
__ JumpIfSmi(r3, &miss);
// Goto miss case if we do not have a function.
__ CompareObjectType(r3, r6, r6, JS_FUNCTION_TYPE);
__ bne(&miss);
// Make sure the function is not the Array() function, which requires special
// behavior on MISS.
__ LoadNativeContextSlot(Context::ARRAY_FUNCTION_INDEX, r6);
__ CmpP(r3, r6);
__ beq(&miss);
// Make sure the function belongs to the same native context.
__ LoadP(r6, FieldMemOperand(r3, JSFunction::kContextOffset));
__ LoadP(r6, ContextMemOperand(r6, Context::NATIVE_CONTEXT_INDEX));
__ LoadP(ip, NativeContextMemOperand());
__ CmpP(r6, ip);
__ bne(&miss);
// Store the function. Use a stub since we need a frame for allocation.
// r4 - vector
// r5 - slot
// r3 - function
{
FrameScope scope(masm, StackFrame::INTERNAL);
CreateWeakCellStub create_stub(masm->isolate());
__ SmiTag(r2);
__ Push(r2, r4, r5, cp, r3);
__ CallStub(&create_stub);
__ Pop(r4, r5, cp, r3);
__ Pop(r2);
__ SmiUntag(r2);
}
__ b(&call_function);
// We are here because tracing is on or we encountered a MISS case we can't
// handle here.
__ bind(&miss);
GenerateMiss(masm);
__ b(&call_count_incremented);
}
void CallICStub::GenerateMiss(MacroAssembler* masm) {
FrameScope scope(masm, StackFrame::INTERNAL);
// Preserve the number of arguments as Smi.
__ SmiTag(r2);
// Push the receiver and the function and feedback info.
__ Push(r2, r3, r4, r5);
// Call the entry.
__ CallRuntime(Runtime::kCallIC_Miss);
// Move result to r3 and exit the internal frame.
__ LoadRR(r3, r2);
// Restore number of arguments.
__ Pop(r2);
__ SmiUntag(r2);
}
// StringCharCodeAtGenerator
void StringCharCodeAtGenerator::GenerateFast(MacroAssembler* masm) {
// If the receiver is a smi trigger the non-string case.
if (check_mode_ == RECEIVER_IS_UNKNOWN) {
__ JumpIfSmi(object_, receiver_not_string_);
// Fetch the instance type of the receiver into result register.
__ LoadP(result_, FieldMemOperand(object_, HeapObject::kMapOffset));
__ LoadlB(result_, FieldMemOperand(result_, Map::kInstanceTypeOffset));
// If the receiver is not a string trigger the non-string case.
__ mov(r0, Operand(kIsNotStringMask));
__ AndP(r0, result_);
__ bne(receiver_not_string_);
}
// If the index is non-smi trigger the non-smi case.
__ JumpIfNotSmi(index_, &index_not_smi_);
__ bind(&got_smi_index_);
// Check for index out of range.
__ LoadP(ip, FieldMemOperand(object_, String::kLengthOffset));
__ CmpLogicalP(ip, index_);
__ ble(index_out_of_range_);
__ SmiUntag(index_);
StringCharLoadGenerator::Generate(masm, object_, index_, result_,
&call_runtime_);
__ SmiTag(result_);
__ bind(&exit_);
}
void StringCharCodeAtGenerator::GenerateSlow(
MacroAssembler* masm, EmbedMode embed_mode,
const RuntimeCallHelper& call_helper) {
__ Abort(kUnexpectedFallthroughToCharCodeAtSlowCase);
// Index is not a smi.
__ bind(&index_not_smi_);
// If index is a heap number, try converting it to an integer.
__ CheckMap(index_, result_, Heap::kHeapNumberMapRootIndex, index_not_number_,
DONT_DO_SMI_CHECK);
call_helper.BeforeCall(masm);
if (embed_mode == PART_OF_IC_HANDLER) {
__ Push(LoadWithVectorDescriptor::VectorRegister(),
LoadWithVectorDescriptor::SlotRegister(), object_, index_);
} else {
// index_ is consumed by runtime conversion function.
__ Push(object_, index_);
}
__ CallRuntime(Runtime::kNumberToSmi);
// Save the conversion result before the pop instructions below
// have a chance to overwrite it.
__ Move(index_, r2);
if (embed_mode == PART_OF_IC_HANDLER) {
__ Pop(LoadWithVectorDescriptor::VectorRegister(),
LoadWithVectorDescriptor::SlotRegister(), object_);
} else {
__ pop(object_);
}
// Reload the instance type.
__ LoadP(result_, FieldMemOperand(object_, HeapObject::kMapOffset));
__ LoadlB(result_, FieldMemOperand(result_, Map::kInstanceTypeOffset));
call_helper.AfterCall(masm);
// If index is still not a smi, it must be out of range.
__ JumpIfNotSmi(index_, index_out_of_range_);
// Otherwise, return to the fast path.
__ b(&got_smi_index_);
// Call runtime. We get here when the receiver is a string and the
// index is a number, but the code of getting the actual character
// is too complex (e.g., when the string needs to be flattened).
__ bind(&call_runtime_);
call_helper.BeforeCall(masm);
__ SmiTag(index_);
__ Push(object_, index_);
__ CallRuntime(Runtime::kStringCharCodeAtRT);
__ Move(result_, r2);
call_helper.AfterCall(masm);
__ b(&exit_);
__ Abort(kUnexpectedFallthroughFromCharCodeAtSlowCase);
}
// -------------------------------------------------------------------------
// StringCharFromCodeGenerator
void StringCharFromCodeGenerator::GenerateFast(MacroAssembler* masm) {
// Fast case of Heap::LookupSingleCharacterStringFromCode.
DCHECK(base::bits::IsPowerOfTwo32(String::kMaxOneByteCharCodeU + 1));
__ LoadSmiLiteral(r0, Smi::FromInt(~String::kMaxOneByteCharCodeU));
__ OrP(r0, r0, Operand(kSmiTagMask));
__ AndP(r0, code_, r0);
__ bne(&slow_case_);
__ LoadRoot(result_, Heap::kSingleCharacterStringCacheRootIndex);
// At this point code register contains smi tagged one-byte char code.
__ LoadRR(r0, code_);
__ SmiToPtrArrayOffset(code_, code_);
__ AddP(result_, code_);
__ LoadRR(code_, r0);
__ LoadP(result_, FieldMemOperand(result_, FixedArray::kHeaderSize));
__ CompareRoot(result_, Heap::kUndefinedValueRootIndex);
__ beq(&slow_case_);
__ bind(&exit_);
}
void StringCharFromCodeGenerator::GenerateSlow(
MacroAssembler* masm, const RuntimeCallHelper& call_helper) {
__ Abort(kUnexpectedFallthroughToCharFromCodeSlowCase);
__ bind(&slow_case_);
call_helper.BeforeCall(masm);
__ push(code_);
__ CallRuntime(Runtime::kStringCharFromCode);
__ Move(result_, r2);
call_helper.AfterCall(masm);
__ b(&exit_);
__ Abort(kUnexpectedFallthroughFromCharFromCodeSlowCase);
}
enum CopyCharactersFlags { COPY_ASCII = 1, DEST_ALWAYS_ALIGNED = 2 };
void StringHelper::GenerateCopyCharacters(MacroAssembler* masm, Register dest,
Register src, Register count,
Register scratch,
String::Encoding encoding) {
if (FLAG_debug_code) {
// Check that destination is word aligned.
__ mov(r0, Operand(kPointerAlignmentMask));
__ AndP(r0, dest);
__ Check(eq, kDestinationOfCopyNotAligned, cr0);
}
// Nothing to do for zero characters.
Label done;
if (encoding == String::TWO_BYTE_ENCODING) {
// double the length
__ AddP(count, count, count);
__ beq(&done, Label::kNear);
} else {
__ CmpP(count, Operand::Zero());
__ beq(&done, Label::kNear);
}
// Copy count bytes from src to dst.
Label byte_loop;
// TODO(joransiu): Convert into MVC loop
__ bind(&byte_loop);
__ LoadlB(scratch, MemOperand(src));
__ la(src, MemOperand(src, 1));
__ stc(scratch, MemOperand(dest));
__ la(dest, MemOperand(dest, 1));
__ BranchOnCount(count, &byte_loop);
__ bind(&done);
}
void StringHelper::GenerateFlatOneByteStringEquals(MacroAssembler* masm,
Register left,
Register right,
Register scratch1,
Register scratch2) {
Register length = scratch1;
// Compare lengths.
Label strings_not_equal, check_zero_length;
__ LoadP(length, FieldMemOperand(left, String::kLengthOffset));
__ LoadP(scratch2, FieldMemOperand(right, String::kLengthOffset));
__ CmpP(length, scratch2);
__ beq(&check_zero_length);
__ bind(&strings_not_equal);
__ LoadSmiLiteral(r2, Smi::FromInt(NOT_EQUAL));
__ Ret();
// Check if the length is zero.
Label compare_chars;
__ bind(&check_zero_length);
STATIC_ASSERT(kSmiTag == 0);
__ CmpP(length, Operand::Zero());
__ bne(&compare_chars);
__ LoadSmiLiteral(r2, Smi::FromInt(EQUAL));
__ Ret();
// Compare characters.
__ bind(&compare_chars);
GenerateOneByteCharsCompareLoop(masm, left, right, length, scratch2,
&strings_not_equal);
// Characters are equal.
__ LoadSmiLiteral(r2, Smi::FromInt(EQUAL));
__ Ret();
}
void StringHelper::GenerateCompareFlatOneByteStrings(
MacroAssembler* masm, Register left, Register right, Register scratch1,
Register scratch2, Register scratch3) {
Label skip, result_not_equal, compare_lengths;
// Find minimum length and length difference.
__ LoadP(scratch1, FieldMemOperand(left, String::kLengthOffset));
__ LoadP(scratch2, FieldMemOperand(right, String::kLengthOffset));
__ SubP(scratch3, scratch1, scratch2 /*, LeaveOE, SetRC*/);
// Removing RC looks okay here.
Register length_delta = scratch3;
__ ble(&skip, Label::kNear);
__ LoadRR(scratch1, scratch2);
__ bind(&skip);
Register min_length = scratch1;
STATIC_ASSERT(kSmiTag == 0);
__ CmpP(min_length, Operand::Zero());
__ beq(&compare_lengths);
// Compare loop.
GenerateOneByteCharsCompareLoop(masm, left, right, min_length, scratch2,
&result_not_equal);
// Compare lengths - strings up to min-length are equal.
__ bind(&compare_lengths);
DCHECK(Smi::FromInt(EQUAL) == static_cast<Smi*>(0));
// Use length_delta as result if it's zero.
__ LoadRR(r2, length_delta);
__ CmpP(length_delta, Operand::Zero());
__ bind(&result_not_equal);
// Conditionally update the result based either on length_delta or
// the last comparion performed in the loop above.
Label less_equal, equal;
__ ble(&less_equal);
__ LoadSmiLiteral(r2, Smi::FromInt(GREATER));
__ Ret();
__ bind(&less_equal);
__ beq(&equal);
__ LoadSmiLiteral(r2, Smi::FromInt(LESS));
__ bind(&equal);
__ Ret();
}
void StringHelper::GenerateOneByteCharsCompareLoop(
MacroAssembler* masm, Register left, Register right, Register length,
Register scratch1, Label* chars_not_equal) {
// Change index to run from -length to -1 by adding length to string
// start. This means that loop ends when index reaches zero, which
// doesn't need an additional compare.
__ SmiUntag(length);
__ AddP(scratch1, length,
Operand(SeqOneByteString::kHeaderSize - kHeapObjectTag));
__ AddP(left, scratch1);
__ AddP(right, scratch1);
__ LoadComplementRR(length, length);
Register index = length; // index = -length;
// Compare loop.
Label loop;
__ bind(&loop);
__ LoadlB(scratch1, MemOperand(left, index));
__ LoadlB(r0, MemOperand(right, index));
__ CmpP(scratch1, r0);
__ bne(chars_not_equal);
__ AddP(index, Operand(1));
__ CmpP(index, Operand::Zero());
__ bne(&loop);
}
void BinaryOpICWithAllocationSiteStub::Generate(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- r3 : left
// -- r2 : right
// r3: second string
// -----------------------------------
// Load r4 with the allocation site. We stick an undefined dummy value here
// and replace it with the real allocation site later when we instantiate this
// stub in BinaryOpICWithAllocationSiteStub::GetCodeCopyFromTemplate().
__ Move(r4, isolate()->factory()->undefined_value());
// Make sure that we actually patched the allocation site.
if (FLAG_debug_code) {
__ TestIfSmi(r4);
__ Assert(ne, kExpectedAllocationSite, cr0);
__ push(r4);
__ LoadP(r4, FieldMemOperand(r4, HeapObject::kMapOffset));
__ CompareRoot(r4, Heap::kAllocationSiteMapRootIndex);
__ pop(r4);
__ Assert(eq, kExpectedAllocationSite);
}
// Tail call into the stub that handles binary operations with allocation
// sites.
BinaryOpWithAllocationSiteStub stub(isolate(), state());
__ TailCallStub(&stub);
}
void CompareICStub::GenerateBooleans(MacroAssembler* masm) {
DCHECK_EQ(CompareICState::BOOLEAN, state());
Label miss;
__ CheckMap(r3, r4, Heap::kBooleanMapRootIndex, &miss, DO_SMI_CHECK);
__ CheckMap(r2, r5, Heap::kBooleanMapRootIndex, &miss, DO_SMI_CHECK);
if (!Token::IsEqualityOp(op())) {
__ LoadP(r3, FieldMemOperand(r3, Oddball::kToNumberOffset));
__ AssertSmi(r3);
__ LoadP(r2, FieldMemOperand(r2, Oddball::kToNumberOffset));
__ AssertSmi(r2);
}
__ SubP(r2, r3, r2);
__ Ret();
__ bind(&miss);
GenerateMiss(masm);
}
void CompareICStub::GenerateSmis(MacroAssembler* masm) {
DCHECK(state() == CompareICState::SMI);
Label miss;
__ OrP(r4, r3, r2);
__ JumpIfNotSmi(r4, &miss);
if (GetCondition() == eq) {
// For equality we do not care about the sign of the result.
// __ sub(r2, r2, r3, SetCC);
__ SubP(r2, r2, r3);
} else {
// Untag before subtracting to avoid handling overflow.
__ SmiUntag(r3);
__ SmiUntag(r2);
__ SubP(r2, r3, r2);
}
__ Ret();
__ bind(&miss);
GenerateMiss(masm);
}
void CompareICStub::GenerateNumbers(MacroAssembler* masm) {
DCHECK(state() == CompareICState::NUMBER);
Label generic_stub;
Label unordered, maybe_undefined1, maybe_undefined2;
Label miss;
Label equal, less_than;
if (left() == CompareICState::SMI) {
__ JumpIfNotSmi(r3, &miss);
}
if (right() == CompareICState::SMI) {
__ JumpIfNotSmi(r2, &miss);
}
// Inlining the double comparison and falling back to the general compare
// stub if NaN is involved.
// Load left and right operand.
Label done, left, left_smi, right_smi;
__ JumpIfSmi(r2, &right_smi);
__ CheckMap(r2, r4, Heap::kHeapNumberMapRootIndex, &maybe_undefined1,
DONT_DO_SMI_CHECK);
__ LoadDouble(d1, FieldMemOperand(r2, HeapNumber::kValueOffset));
__ b(&left);
__ bind(&right_smi);
__ SmiToDouble(d1, r2);
__ bind(&left);
__ JumpIfSmi(r3, &left_smi);
__ CheckMap(r3, r4, Heap::kHeapNumberMapRootIndex, &maybe_undefined2,
DONT_DO_SMI_CHECK);
__ LoadDouble(d0, FieldMemOperand(r3, HeapNumber::kValueOffset));
__ b(&done);
__ bind(&left_smi);
__ SmiToDouble(d0, r3);
__ bind(&done);
// Compare operands
__ cdbr(d0, d1);
// Don't base result on status bits when a NaN is involved.
__ bunordered(&unordered);
// Return a result of -1, 0, or 1, based on status bits.
__ beq(&equal);
__ blt(&less_than);
// assume greater than
__ LoadImmP(r2, Operand(GREATER));
__ Ret();
__ bind(&equal);
__ LoadImmP(r2, Operand(EQUAL));
__ Ret();
__ bind(&less_than);
__ LoadImmP(r2, Operand(LESS));
__ Ret();
__ bind(&unordered);
__ bind(&generic_stub);
CompareICStub stub(isolate(), op(), CompareICState::GENERIC,
CompareICState::GENERIC, CompareICState::GENERIC);
__ Jump(stub.GetCode(), RelocInfo::CODE_TARGET);
__ bind(&maybe_undefined1);
if (Token::IsOrderedRelationalCompareOp(op())) {
__ CompareRoot(r2, Heap::kUndefinedValueRootIndex);
__ bne(&miss);
__ JumpIfSmi(r3, &unordered);
__ CompareObjectType(r3, r4, r4, HEAP_NUMBER_TYPE);
__ bne(&maybe_undefined2);
__ b(&unordered);
}
__ bind(&maybe_undefined2);
if (Token::IsOrderedRelationalCompareOp(op())) {
__ CompareRoot(r3, Heap::kUndefinedValueRootIndex);
__ beq(&unordered);
}
__ bind(&miss);
GenerateMiss(masm);
}
void CompareICStub::GenerateInternalizedStrings(MacroAssembler* masm) {
DCHECK(state() == CompareICState::INTERNALIZED_STRING);
Label miss, not_equal;
// Registers containing left and right operands respectively.
Register left = r3;
Register right = r2;
Register tmp1 = r4;
Register tmp2 = r5;
// Check that both operands are heap objects.
__ JumpIfEitherSmi(left, right, &miss);
// Check that both operands are symbols.
__ LoadP(tmp1, FieldMemOperand(left, HeapObject::kMapOffset));
__ LoadP(tmp2, FieldMemOperand(right, HeapObject::kMapOffset));
__ LoadlB(tmp1, FieldMemOperand(tmp1, Map::kInstanceTypeOffset));
__ LoadlB(tmp2, FieldMemOperand(tmp2, Map::kInstanceTypeOffset));
STATIC_ASSERT(kInternalizedTag == 0 && kStringTag == 0);
__ OrP(tmp1, tmp1, tmp2);
__ AndP(r0, tmp1, Operand(kIsNotStringMask | kIsNotInternalizedMask));
__ bne(&miss);
// Internalized strings are compared by identity.
__ CmpP(left, right);
__ bne(¬_equal);
// Make sure r2 is non-zero. At this point input operands are
// guaranteed to be non-zero.
DCHECK(right.is(r2));
STATIC_ASSERT(EQUAL == 0);
STATIC_ASSERT(kSmiTag == 0);
__ LoadSmiLiteral(r2, Smi::FromInt(EQUAL));
__ bind(¬_equal);
__ Ret();
__ bind(&miss);
GenerateMiss(masm);
}
void CompareICStub::GenerateUniqueNames(MacroAssembler* masm) {
DCHECK(state() == CompareICState::UNIQUE_NAME);
DCHECK(GetCondition() == eq);
Label miss;
// Registers containing left and right operands respectively.
Register left = r3;
Register right = r2;
Register tmp1 = r4;
Register tmp2 = r5;
// Check that both operands are heap objects.
__ JumpIfEitherSmi(left, right, &miss);
// Check that both operands are unique names. This leaves the instance
// types loaded in tmp1 and tmp2.
__ LoadP(tmp1, FieldMemOperand(left, HeapObject::kMapOffset));
__ LoadP(tmp2, FieldMemOperand(right, HeapObject::kMapOffset));
__ LoadlB(tmp1, FieldMemOperand(tmp1, Map::kInstanceTypeOffset));
__ LoadlB(tmp2, FieldMemOperand(tmp2, Map::kInstanceTypeOffset));
__ JumpIfNotUniqueNameInstanceType(tmp1, &miss);
__ JumpIfNotUniqueNameInstanceType(tmp2, &miss);
// Unique names are compared by identity.
__ CmpP(left, right);
__ bne(&miss);
// Make sure r2 is non-zero. At this point input operands are
// guaranteed to be non-zero.
DCHECK(right.is(r2));
STATIC_ASSERT(EQUAL == 0);
STATIC_ASSERT(kSmiTag == 0);
__ LoadSmiLiteral(r2, Smi::FromInt(EQUAL));
__ Ret();
__ bind(&miss);
GenerateMiss(masm);
}
void CompareICStub::GenerateStrings(MacroAssembler* masm) {
DCHECK(state() == CompareICState::STRING);
Label miss, not_identical, is_symbol;
bool equality = Token::IsEqualityOp(op());
// Registers containing left and right operands respectively.
Register left = r3;
Register right = r2;
Register tmp1 = r4;
Register tmp2 = r5;
Register tmp3 = r6;
Register tmp4 = r7;
// Check that both operands are heap objects.
__ JumpIfEitherSmi(left, right, &miss);
// Check that both operands are strings. This leaves the instance
// types loaded in tmp1 and tmp2.
__ LoadP(tmp1, FieldMemOperand(left, HeapObject::kMapOffset));
__ LoadP(tmp2, FieldMemOperand(right, HeapObject::kMapOffset));
__ LoadlB(tmp1, FieldMemOperand(tmp1, Map::kInstanceTypeOffset));
__ LoadlB(tmp2, FieldMemOperand(tmp2, Map::kInstanceTypeOffset));
STATIC_ASSERT(kNotStringTag != 0);
__ OrP(tmp3, tmp1, tmp2);
__ AndP(r0, tmp3, Operand(kIsNotStringMask));
__ bne(&miss);
// Fast check for identical strings.
__ CmpP(left, right);
STATIC_ASSERT(EQUAL == 0);
STATIC_ASSERT(kSmiTag == 0);
__ bne(¬_identical);
__ LoadSmiLiteral(r2, Smi::FromInt(EQUAL));
__ Ret();
__ bind(¬_identical);
// Handle not identical strings.
// Check that both strings are internalized strings. If they are, we're done
// because we already know they are not identical. We know they are both
// strings.
if (equality) {
DCHECK(GetCondition() == eq);
STATIC_ASSERT(kInternalizedTag == 0);
__ OrP(tmp3, tmp1, tmp2);
__ AndP(r0, tmp3, Operand(kIsNotInternalizedMask));
__ bne(&is_symbol);
// Make sure r2 is non-zero. At this point input operands are
// guaranteed to be non-zero.
DCHECK(right.is(r2));
__ Ret();
__ bind(&is_symbol);
}
// Check that both strings are sequential one-byte.
Label runtime;
__ JumpIfBothInstanceTypesAreNotSequentialOneByte(tmp1, tmp2, tmp3, tmp4,
&runtime);
// Compare flat one-byte strings. Returns when done.
if (equality) {
StringHelper::GenerateFlatOneByteStringEquals(masm, left, right, tmp1,
tmp2);
} else {
StringHelper::GenerateCompareFlatOneByteStrings(masm, left, right, tmp1,
tmp2, tmp3);
}
// Handle more complex cases in runtime.
__ bind(&runtime);
if (equality) {
{
FrameAndConstantPoolScope scope(masm, StackFrame::INTERNAL);
__ Push(left, right);
__ CallRuntime(Runtime::kStringEqual);
}
__ LoadRoot(r3, Heap::kTrueValueRootIndex);
__ SubP(r2, r2, r3);
__ Ret();
} else {
__ Push(left, right);
__ TailCallRuntime(Runtime::kStringCompare);
}
__ bind(&miss);
GenerateMiss(masm);
}
void CompareICStub::GenerateReceivers(MacroAssembler* masm) {
DCHECK_EQ(CompareICState::RECEIVER, state());
Label miss;
__ AndP(r4, r3, r2);
__ JumpIfSmi(r4, &miss);
STATIC_ASSERT(LAST_TYPE == LAST_JS_RECEIVER_TYPE);
__ CompareObjectType(r2, r4, r4, FIRST_JS_RECEIVER_TYPE);
__ blt(&miss);
__ CompareObjectType(r3, r4, r4, FIRST_JS_RECEIVER_TYPE);
__ blt(&miss);
DCHECK(GetCondition() == eq);
__ SubP(r2, r2, r3);
__ Ret();
__ bind(&miss);
GenerateMiss(masm);
}
void CompareICStub::GenerateKnownReceivers(MacroAssembler* masm) {
Label miss;
Handle<WeakCell> cell = Map::WeakCellForMap(known_map_);
__ AndP(r4, r3, r2);
__ JumpIfSmi(r4, &miss);
__ GetWeakValue(r6, cell);
__ LoadP(r4, FieldMemOperand(r2, HeapObject::kMapOffset));
__ LoadP(r5, FieldMemOperand(r3, HeapObject::kMapOffset));
__ CmpP(r4, r6);
__ bne(&miss);
__ CmpP(r5, r6);
__ bne(&miss);
if (Token::IsEqualityOp(op())) {
__ SubP(r2, r2, r3);
__ Ret();
} else {
if (op() == Token::LT || op() == Token::LTE) {
__ LoadSmiLiteral(r4, Smi::FromInt(GREATER));
} else {
__ LoadSmiLiteral(r4, Smi::FromInt(LESS));
}
__ Push(r3, r2, r4);
__ TailCallRuntime(Runtime::kCompare);
}
__ bind(&miss);
GenerateMiss(masm);
}
void CompareICStub::GenerateMiss(MacroAssembler* masm) {
{
// Call the runtime system in a fresh internal frame.
FrameScope scope(masm, StackFrame::INTERNAL);
__ Push(r3, r2);
__ Push(r3, r2);
__ LoadSmiLiteral(r0, Smi::FromInt(op()));
__ push(r0);
__ CallRuntime(Runtime::kCompareIC_Miss);
// Compute the entry point of the rewritten stub.
__ AddP(r4, r2, Operand(Code::kHeaderSize - kHeapObjectTag));
// Restore registers.
__ Pop(r3, r2);
}
__ JumpToJSEntry(r4);
}
// This stub is paired with DirectCEntryStub::GenerateCall
void DirectCEntryStub::Generate(MacroAssembler* masm) {
__ CleanseP(r14);
__ b(ip); // Callee will return to R14 directly
}
void DirectCEntryStub::GenerateCall(MacroAssembler* masm, Register target) {
#if ABI_USES_FUNCTION_DESCRIPTORS && !defined(USE_SIMULATOR)
// Native AIX/S390X Linux use a function descriptor.
__ LoadP(ToRegister(ABI_TOC_REGISTER), MemOperand(target, kPointerSize));
__ LoadP(target, MemOperand(target, 0)); // Instruction address
#else
// ip needs to be set for DirectCEentryStub::Generate, and also
// for ABI_CALL_VIA_IP.
__ Move(ip, target);
#endif
__ call(GetCode(), RelocInfo::CODE_TARGET); // Call the stub.
}
void NameDictionaryLookupStub::GenerateNegativeLookup(
MacroAssembler* masm, Label* miss, Label* done, Register receiver,
Register properties, Handle<Name> name, Register scratch0) {
DCHECK(name->IsUniqueName());
// If names of slots in range from 1 to kProbes - 1 for the hash value are
// not equal to the name and kProbes-th slot is not used (its name is the
// undefined value), it guarantees the hash table doesn't contain the
// property. It's true even if some slots represent deleted properties
// (their names are the hole value).
for (int i = 0; i < kInlinedProbes; i++) {
// scratch0 points to properties hash.
// Compute the masked index: (hash + i + i * i) & mask.
Register index = scratch0;
// Capacity is smi 2^n.
__ LoadP(index, FieldMemOperand(properties, kCapacityOffset));
__ SubP(index, Operand(1));
__ LoadSmiLiteral(
ip, Smi::FromInt(name->Hash() + NameDictionary::GetProbeOffset(i)));
__ AndP(index, ip);
// Scale the index by multiplying by the entry size.
STATIC_ASSERT(NameDictionary::kEntrySize == 3);
__ ShiftLeftP(ip, index, Operand(1));
__ AddP(index, ip); // index *= 3.
Register entity_name = scratch0;
// Having undefined at this place means the name is not contained.
Register tmp = properties;
__ SmiToPtrArrayOffset(ip, index);
__ AddP(tmp, properties, ip);
__ LoadP(entity_name, FieldMemOperand(tmp, kElementsStartOffset));
DCHECK(!tmp.is(entity_name));
__ CompareRoot(entity_name, Heap::kUndefinedValueRootIndex);
__ beq(done);
// Stop if found the property.
__ CmpP(entity_name, Operand(Handle<Name>(name)));
__ beq(miss);
Label good;
__ CompareRoot(entity_name, Heap::kTheHoleValueRootIndex);
__ beq(&good);
// Check if the entry name is not a unique name.
__ LoadP(entity_name, FieldMemOperand(entity_name, HeapObject::kMapOffset));
__ LoadlB(entity_name,
FieldMemOperand(entity_name, Map::kInstanceTypeOffset));
__ JumpIfNotUniqueNameInstanceType(entity_name, miss);
__ bind(&good);
// Restore the properties.
__ LoadP(properties,
FieldMemOperand(receiver, JSObject::kPropertiesOffset));
}
const int spill_mask = (r0.bit() | r8.bit() | r7.bit() | r6.bit() | r5.bit() |
r4.bit() | r3.bit() | r2.bit());
__ LoadRR(r0, r14);
__ MultiPush(spill_mask);
__ LoadP(r2, FieldMemOperand(receiver, JSObject::kPropertiesOffset));
__ mov(r3, Operand(Handle<Name>(name)));
NameDictionaryLookupStub stub(masm->isolate(), NEGATIVE_LOOKUP);
__ CallStub(&stub);
__ CmpP(r2, Operand::Zero());
__ MultiPop(spill_mask); // MultiPop does not touch condition flags
__ LoadRR(r14, r0);
__ beq(done);
__ bne(miss);
}
// Probe the name dictionary in the |elements| register. Jump to the
// |done| label if a property with the given name is found. Jump to
// the |miss| label otherwise.
// If lookup was successful |scratch2| will be equal to elements + 4 * index.
void NameDictionaryLookupStub::GeneratePositiveLookup(
MacroAssembler* masm, Label* miss, Label* done, Register elements,
Register name, Register scratch1, Register scratch2) {
DCHECK(!elements.is(scratch1));
DCHECK(!elements.is(scratch2));
DCHECK(!name.is(scratch1));
DCHECK(!name.is(scratch2));
__ AssertName(name);
// Compute the capacity mask.
__ LoadP(scratch1, FieldMemOperand(elements, kCapacityOffset));
__ SmiUntag(scratch1); // convert smi to int
__ SubP(scratch1, Operand(1));
// Generate an unrolled loop that performs a few probes before
// giving up. Measurements done on Gmail indicate that 2 probes
// cover ~93% of loads from dictionaries.
for (int i = 0; i < kInlinedProbes; i++) {
// Compute the masked index: (hash + i + i * i) & mask.
__ LoadlW(scratch2, FieldMemOperand(name, String::kHashFieldOffset));
if (i > 0) {
// Add the probe offset (i + i * i) left shifted to avoid right shifting
// the hash in a separate instruction. The value hash + i + i * i is right
// shifted in the following and instruction.
DCHECK(NameDictionary::GetProbeOffset(i) <
1 << (32 - Name::kHashFieldOffset));
__ AddP(scratch2,
Operand(NameDictionary::GetProbeOffset(i) << Name::kHashShift));
}
__ srl(scratch2, Operand(String::kHashShift));
__ AndP(scratch2, scratch1);
// Scale the index by multiplying by the entry size.
STATIC_ASSERT(NameDictionary::kEntrySize == 3);
// scratch2 = scratch2 * 3.
__ ShiftLeftP(ip, scratch2, Operand(1));
__ AddP(scratch2, ip);
// Check if the key is identical to the name.
__ ShiftLeftP(ip, scratch2, Operand(kPointerSizeLog2));
__ AddP(scratch2, elements, ip);
__ LoadP(ip, FieldMemOperand(scratch2, kElementsStartOffset));
__ CmpP(name, ip);
__ beq(done);
}
const int spill_mask = (r0.bit() | r8.bit() | r7.bit() | r6.bit() | r5.bit() |
r4.bit() | r3.bit() | r2.bit()) &
~(scratch1.bit() | scratch2.bit());
__ LoadRR(r0, r14);
__ MultiPush(spill_mask);
if (name.is(r2)) {
DCHECK(!elements.is(r3));
__ LoadRR(r3, name);
__ LoadRR(r2, elements);
} else {
__ LoadRR(r2, elements);
__ LoadRR(r3, name);
}
NameDictionaryLookupStub stub(masm->isolate(), POSITIVE_LOOKUP);
__ CallStub(&stub);
__ LoadRR(r1, r2);
__ LoadRR(scratch2, r4);
__ MultiPop(spill_mask);
__ LoadRR(r14, r0);
__ CmpP(r1, Operand::Zero());
__ bne(done);
__ beq(miss);
}
void NameDictionaryLookupStub::Generate(MacroAssembler* masm) {
// This stub overrides SometimesSetsUpAFrame() to return false. That means
// we cannot call anything that could cause a GC from this stub.
// Registers:
// result: NameDictionary to probe
// r3: key
// dictionary: NameDictionary to probe.
// index: will hold an index of entry if lookup is successful.
// might alias with result_.
// Returns:
// result_ is zero if lookup failed, non zero otherwise.
Register result = r2;
Register dictionary = r2;
Register key = r3;
Register index = r4;
Register mask = r5;
Register hash = r6;
Register undefined = r7;
Register entry_key = r8;
Register scratch = r8;
Label in_dictionary, maybe_in_dictionary, not_in_dictionary;
__ LoadP(mask, FieldMemOperand(dictionary, kCapacityOffset));
__ SmiUntag(mask);
__ SubP(mask, Operand(1));
__ LoadlW(hash, FieldMemOperand(key, String::kHashFieldOffset));
__ LoadRoot(undefined, Heap::kUndefinedValueRootIndex);
for (int i = kInlinedProbes; i < kTotalProbes; i++) {
// Compute the masked index: (hash + i + i * i) & mask.
// Capacity is smi 2^n.
if (i > 0) {
// Add the probe offset (i + i * i) left shifted to avoid right shifting
// the hash in a separate instruction. The value hash + i + i * i is right
// shifted in the following and instruction.
DCHECK(NameDictionary::GetProbeOffset(i) <
1 << (32 - Name::kHashFieldOffset));
__ AddP(index, hash,
Operand(NameDictionary::GetProbeOffset(i) << Name::kHashShift));
} else {
__ LoadRR(index, hash);
}
__ ShiftRight(r0, index, Operand(String::kHashShift));
__ AndP(index, r0, mask);
// Scale the index by multiplying by the entry size.
STATIC_ASSERT(NameDictionary::kEntrySize == 3);
__ ShiftLeftP(scratch, index, Operand(1));
__ AddP(index, scratch); // index *= 3.
__ ShiftLeftP(scratch, index, Operand(kPointerSizeLog2));
__ AddP(index, dictionary, scratch);
__ LoadP(entry_key, FieldMemOperand(index, kElementsStartOffset));
// Having undefined at this place means the name is not contained.
__ CmpP(entry_key, undefined);
__ beq(¬_in_dictionary);
// Stop if found the property.
__ CmpP(entry_key, key);
__ beq(&in_dictionary);
if (i != kTotalProbes - 1 && mode() == NEGATIVE_LOOKUP) {
// Check if the entry name is not a unique name.
__ LoadP(entry_key, FieldMemOperand(entry_key, HeapObject::kMapOffset));
__ LoadlB(entry_key,
FieldMemOperand(entry_key, Map::kInstanceTypeOffset));
__ JumpIfNotUniqueNameInstanceType(entry_key, &maybe_in_dictionary);
}
}
__ bind(&maybe_in_dictionary);
// If we are doing negative lookup then probing failure should be
// treated as a lookup success. For positive lookup probing failure
// should be treated as lookup failure.
if (mode() == POSITIVE_LOOKUP) {
__ LoadImmP(result, Operand::Zero());
__ Ret();
}
__ bind(&in_dictionary);
__ LoadImmP(result, Operand(1));
__ Ret();
__ bind(¬_in_dictionary);
__ LoadImmP(result, Operand::Zero());
__ Ret();
}
void StoreBufferOverflowStub::GenerateFixedRegStubsAheadOfTime(
Isolate* isolate) {
StoreBufferOverflowStub stub1(isolate, kDontSaveFPRegs);
stub1.GetCode();
// Hydrogen code stubs need stub2 at snapshot time.
StoreBufferOverflowStub stub2(isolate, kSaveFPRegs);
stub2.GetCode();
}
// Takes the input in 3 registers: address_ value_ and object_. A pointer to
// the value has just been written into the object, now this stub makes sure
// we keep the GC informed. The word in the object where the value has been
// written is in the address register.
void RecordWriteStub::Generate(MacroAssembler* masm) {
Label skip_to_incremental_noncompacting;
Label skip_to_incremental_compacting;
// The first two branch instructions are generated with labels so as to
// get the offset fixed up correctly by the bind(Label*) call. We patch
// it back and forth between branch condition True and False
// when we start and stop incremental heap marking.
// See RecordWriteStub::Patch for details.
// Clear the bit, branch on True for NOP action initially
__ b(CC_NOP, &skip_to_incremental_noncompacting);
__ b(CC_NOP, &skip_to_incremental_compacting);
if (remembered_set_action() == EMIT_REMEMBERED_SET) {
__ RememberedSetHelper(object(), address(), value(), save_fp_regs_mode(),
MacroAssembler::kReturnAtEnd);
}
__ Ret();
__ bind(&skip_to_incremental_noncompacting);
GenerateIncremental(masm, INCREMENTAL);
__ bind(&skip_to_incremental_compacting);
GenerateIncremental(masm, INCREMENTAL_COMPACTION);
// Initial mode of the stub is expected to be STORE_BUFFER_ONLY.
// Will be checked in IncrementalMarking::ActivateGeneratedStub.
// patching not required on S390 as the initial path is effectively NOP
}
void RecordWriteStub::GenerateIncremental(MacroAssembler* masm, Mode mode) {
regs_.Save(masm);
if (remembered_set_action() == EMIT_REMEMBERED_SET) {
Label dont_need_remembered_set;
__ LoadP(regs_.scratch0(), MemOperand(regs_.address(), 0));
__ JumpIfNotInNewSpace(regs_.scratch0(), // Value.
regs_.scratch0(), &dont_need_remembered_set);
__ JumpIfInNewSpace(regs_.object(), regs_.scratch0(),
&dont_need_remembered_set);
// First notify the incremental marker if necessary, then update the
// remembered set.
CheckNeedsToInformIncrementalMarker(
masm, kUpdateRememberedSetOnNoNeedToInformIncrementalMarker, mode);
InformIncrementalMarker(masm);
regs_.Restore(masm);
__ RememberedSetHelper(object(), address(), value(), save_fp_regs_mode(),
MacroAssembler::kReturnAtEnd);
__ bind(&dont_need_remembered_set);
}
CheckNeedsToInformIncrementalMarker(
masm, kReturnOnNoNeedToInformIncrementalMarker, mode);
InformIncrementalMarker(masm);
regs_.Restore(masm);
__ Ret();
}
void RecordWriteStub::InformIncrementalMarker(MacroAssembler* masm) {
regs_.SaveCallerSaveRegisters(masm, save_fp_regs_mode());
int argument_count = 3;
__ PrepareCallCFunction(argument_count, regs_.scratch0());
Register address =
r2.is(regs_.address()) ? regs_.scratch0() : regs_.address();
DCHECK(!address.is(regs_.object()));
DCHECK(!address.is(r2));
__ LoadRR(address, regs_.address());
__ LoadRR(r2, regs_.object());
__ LoadRR(r3, address);
__ mov(r4, Operand(ExternalReference::isolate_address(isolate())));
AllowExternalCallThatCantCauseGC scope(masm);
__ CallCFunction(
ExternalReference::incremental_marking_record_write_function(isolate()),
argument_count);
regs_.RestoreCallerSaveRegisters(masm, save_fp_regs_mode());
}
void RecordWriteStub::CheckNeedsToInformIncrementalMarker(
MacroAssembler* masm, OnNoNeedToInformIncrementalMarker on_no_need,
Mode mode) {
Label on_black;
Label need_incremental;
Label need_incremental_pop_scratch;
// Let's look at the color of the object: If it is not black we don't have
// to inform the incremental marker.
__ JumpIfBlack(regs_.object(), regs_.scratch0(), regs_.scratch1(), &on_black);
regs_.Restore(masm);
if (on_no_need == kUpdateRememberedSetOnNoNeedToInformIncrementalMarker) {
__ RememberedSetHelper(object(), address(), value(), save_fp_regs_mode(),
MacroAssembler::kReturnAtEnd);
} else {
__ Ret();
}
__ bind(&on_black);
// Get the value from the slot.
__ LoadP(regs_.scratch0(), MemOperand(regs_.address(), 0));
if (mode == INCREMENTAL_COMPACTION) {
Label ensure_not_white;
__ CheckPageFlag(regs_.scratch0(), // Contains value.
regs_.scratch1(), // Scratch.
MemoryChunk::kEvacuationCandidateMask, eq,
&ensure_not_white);
__ CheckPageFlag(regs_.object(),
regs_.scratch1(), // Scratch.
MemoryChunk::kSkipEvacuationSlotsRecordingMask, eq,
&need_incremental);
__ bind(&ensure_not_white);
}
// We need extra registers for this, so we push the object and the address
// register temporarily.
__ Push(regs_.object(), regs_.address());
__ JumpIfWhite(regs_.scratch0(), // The value.
regs_.scratch1(), // Scratch.
regs_.object(), // Scratch.
regs_.address(), // Scratch.
&need_incremental_pop_scratch);
__ Pop(regs_.object(), regs_.address());
regs_.Restore(masm);
if (on_no_need == kUpdateRememberedSetOnNoNeedToInformIncrementalMarker) {
__ RememberedSetHelper(object(), address(), value(), save_fp_regs_mode(),
MacroAssembler::kReturnAtEnd);
} else {
__ Ret();
}
__ bind(&need_incremental_pop_scratch);
__ Pop(regs_.object(), regs_.address());
__ bind(&need_incremental);
// Fall through when we need to inform the incremental marker.
}
void StubFailureTrampolineStub::Generate(MacroAssembler* masm) {
CEntryStub ces(isolate(), 1, kSaveFPRegs);
__ Call(ces.GetCode(), RelocInfo::CODE_TARGET);
int parameter_count_offset =
StubFailureTrampolineFrameConstants::kArgumentsLengthOffset;
__ LoadP(r3, MemOperand(fp, parameter_count_offset));
if (function_mode() == JS_FUNCTION_STUB_MODE) {
__ AddP(r3, Operand(1));
}
masm->LeaveFrame(StackFrame::STUB_FAILURE_TRAMPOLINE);
__ ShiftLeftP(r3, r3, Operand(kPointerSizeLog2));
__ la(sp, MemOperand(r3, sp));
__ Ret();
}
void CallICTrampolineStub::Generate(MacroAssembler* masm) {
__ EmitLoadTypeFeedbackVector(r4);
CallICStub stub(isolate(), state());
__ Jump(stub.GetCode(), RelocInfo::CODE_TARGET);
}
static void HandleArrayCases(MacroAssembler* masm, Register feedback,
Register receiver_map, Register scratch1,
Register scratch2, bool is_polymorphic,
Label* miss) {
// feedback initially contains the feedback array
Label next_loop, prepare_next;
Label start_polymorphic;
Register cached_map = scratch1;
__ LoadP(cached_map,
FieldMemOperand(feedback, FixedArray::OffsetOfElementAt(0)));
__ LoadP(cached_map, FieldMemOperand(cached_map, WeakCell::kValueOffset));
__ CmpP(receiver_map, cached_map);
__ bne(&start_polymorphic, Label::kNear);
// found, now call handler.
Register handler = feedback;
__ LoadP(handler,
FieldMemOperand(feedback, FixedArray::OffsetOfElementAt(1)));
__ AddP(ip, handler, Operand(Code::kHeaderSize - kHeapObjectTag));
__ Jump(ip);
Register length = scratch2;
__ bind(&start_polymorphic);
__ LoadP(length, FieldMemOperand(feedback, FixedArray::kLengthOffset));
if (!is_polymorphic) {
// If the IC could be monomorphic we have to make sure we don't go past the
// end of the feedback array.
__ CmpSmiLiteral(length, Smi::FromInt(2), r0);
__ beq(miss);
}
Register too_far = length;
Register pointer_reg = feedback;
// +-----+------+------+-----+-----+ ... ----+
// | map | len | wm0 | h0 | wm1 | hN |
// +-----+------+------+-----+-----+ ... ----+
// 0 1 2 len-1
// ^ ^
// | |
// pointer_reg too_far
// aka feedback scratch2
// also need receiver_map
// use cached_map (scratch1) to look in the weak map values.
__ SmiToPtrArrayOffset(r0, length);
__ AddP(too_far, feedback, r0);
__ AddP(too_far, Operand(FixedArray::kHeaderSize - kHeapObjectTag));
__ AddP(pointer_reg, feedback,
Operand(FixedArray::OffsetOfElementAt(2) - kHeapObjectTag));
__ bind(&next_loop);
__ LoadP(cached_map, MemOperand(pointer_reg));
__ LoadP(cached_map, FieldMemOperand(cached_map, WeakCell::kValueOffset));
__ CmpP(receiver_map, cached_map);
__ bne(&prepare_next, Label::kNear);
__ LoadP(handler, MemOperand(pointer_reg, kPointerSize));
__ AddP(ip, handler, Operand(Code::kHeaderSize - kHeapObjectTag));
__ Jump(ip);
__ bind(&prepare_next);
__ AddP(pointer_reg, Operand(kPointerSize * 2));
__ CmpP(pointer_reg, too_far);
__ blt(&next_loop, Label::kNear);
// We exhausted our array of map handler pairs.
__ b(miss);
}
static void HandleMonomorphicCase(MacroAssembler* masm, Register receiver,
Register receiver_map, Register feedback,
Register vector, Register slot,
Register scratch, Label* compare_map,
Label* load_smi_map, Label* try_array) {
__ JumpIfSmi(receiver, load_smi_map);
__ LoadP(receiver_map, FieldMemOperand(receiver, HeapObject::kMapOffset));
__ bind(compare_map);
Register cached_map = scratch;
// Move the weak map into the weak_cell register.
__ LoadP(cached_map, FieldMemOperand(feedback, WeakCell::kValueOffset));
__ CmpP(cached_map, receiver_map);
__ bne(try_array);
Register handler = feedback;
__ SmiToPtrArrayOffset(r1, slot);
__ LoadP(handler,
FieldMemOperand(r1, vector, FixedArray::kHeaderSize + kPointerSize));
__ AddP(ip, handler, Operand(Code::kHeaderSize - kHeapObjectTag));
__ Jump(ip);
}
void KeyedStoreICTrampolineStub::Generate(MacroAssembler* masm) {
__ EmitLoadTypeFeedbackVector(StoreWithVectorDescriptor::VectorRegister());
KeyedStoreICStub stub(isolate(), state());
stub.GenerateForTrampoline(masm);
}
void KeyedStoreICStub::Generate(MacroAssembler* masm) {
GenerateImpl(masm, false);
}
void KeyedStoreICStub::GenerateForTrampoline(MacroAssembler* masm) {
GenerateImpl(masm, true);
}
static void HandlePolymorphicStoreCase(MacroAssembler* masm, Register feedback,
Register receiver_map, Register scratch1,
Register scratch2, Label* miss) {
// feedback initially contains the feedback array
Label next_loop, prepare_next;
Label start_polymorphic;
Label transition_call;
Register cached_map = scratch1;
Register too_far = scratch2;
Register pointer_reg = feedback;
__ LoadP(too_far, FieldMemOperand(feedback, FixedArray::kLengthOffset));
// +-----+------+------+-----+-----+-----+ ... ----+
// | map | len | wm0 | wt0 | h0 | wm1 | hN |
// +-----+------+------+-----+-----+ ----+ ... ----+
// 0 1 2 len-1
// ^ ^
// | |
// pointer_reg too_far
// aka feedback scratch2
// also need receiver_map
// use cached_map (scratch1) to look in the weak map values.
__ SmiToPtrArrayOffset(r0, too_far);
__ AddP(too_far, feedback, r0);
__ AddP(too_far, too_far, Operand(FixedArray::kHeaderSize - kHeapObjectTag));
__ AddP(pointer_reg, feedback,
Operand(FixedArray::OffsetOfElementAt(0) - kHeapObjectTag));
__ bind(&next_loop);
__ LoadP(cached_map, MemOperand(pointer_reg));
__ LoadP(cached_map, FieldMemOperand(cached_map, WeakCell::kValueOffset));
__ CmpP(receiver_map, cached_map);
__ bne(&prepare_next);
// Is it a transitioning store?
__ LoadP(too_far, MemOperand(pointer_reg, kPointerSize));
__ CompareRoot(too_far, Heap::kUndefinedValueRootIndex);
__ bne(&transition_call);
__ LoadP(pointer_reg, MemOperand(pointer_reg, kPointerSize * 2));
__ AddP(ip, pointer_reg, Operand(Code::kHeaderSize - kHeapObjectTag));
__ Jump(ip);
__ bind(&transition_call);
__ LoadP(too_far, FieldMemOperand(too_far, WeakCell::kValueOffset));
__ JumpIfSmi(too_far, miss);
__ LoadP(receiver_map, MemOperand(pointer_reg, kPointerSize * 2));
// Load the map into the correct register.
DCHECK(feedback.is(StoreTransitionDescriptor::MapRegister()));
__ LoadRR(feedback, too_far);
__ AddP(ip, receiver_map, Operand(Code::kHeaderSize - kHeapObjectTag));
__ Jump(ip);
__ bind(&prepare_next);
__ AddP(pointer_reg, pointer_reg, Operand(kPointerSize * 3));
__ CmpLogicalP(pointer_reg, too_far);
__ blt(&next_loop);
// We exhausted our array of map handler pairs.
__ b(miss);
}
void KeyedStoreICStub::GenerateImpl(MacroAssembler* masm, bool in_frame) {
Register receiver = StoreWithVectorDescriptor::ReceiverRegister(); // r3
Register key = StoreWithVectorDescriptor::NameRegister(); // r4
Register vector = StoreWithVectorDescriptor::VectorRegister(); // r5
Register slot = StoreWithVectorDescriptor::SlotRegister(); // r6
DCHECK(StoreWithVectorDescriptor::ValueRegister().is(r2)); // r2
Register feedback = r7;
Register receiver_map = r8;
Register scratch1 = r9;
__ SmiToPtrArrayOffset(r0, slot);
__ AddP(feedback, vector, r0);
__ LoadP(feedback, FieldMemOperand(feedback, FixedArray::kHeaderSize));
// Try to quickly handle the monomorphic case without knowing for sure
// if we have a weak cell in feedback. We do know it's safe to look
// at WeakCell::kValueOffset.
Label try_array, load_smi_map, compare_map;
Label not_array, miss;
HandleMonomorphicCase(masm, receiver, receiver_map, feedback, vector, slot,
scratch1, &compare_map, &load_smi_map, &try_array);
__ bind(&try_array);
// Is it a fixed array?
__ LoadP(scratch1, FieldMemOperand(feedback, HeapObject::kMapOffset));
__ CompareRoot(scratch1, Heap::kFixedArrayMapRootIndex);
__ bne(¬_array);
// We have a polymorphic element handler.
Label polymorphic, try_poly_name;
__ bind(&polymorphic);
Register scratch2 = ip;
HandlePolymorphicStoreCase(masm, feedback, receiver_map, scratch1, scratch2,
&miss);
__ bind(¬_array);
// Is it generic?
__ CompareRoot(feedback, Heap::kmegamorphic_symbolRootIndex);
__ bne(&try_poly_name);
Handle<Code> megamorphic_stub =
KeyedStoreIC::ChooseMegamorphicStub(masm->isolate(), GetExtraICState());
__ Jump(megamorphic_stub, RelocInfo::CODE_TARGET);
__ bind(&try_poly_name);
// We might have a name in feedback, and a fixed array in the next slot.
__ CmpP(key, feedback);
__ bne(&miss);
// If the name comparison succeeded, we know we have a fixed array with
// at least one map/handler pair.
__ SmiToPtrArrayOffset(r0, slot);
__ AddP(feedback, vector, r0);
__ LoadP(feedback,
FieldMemOperand(feedback, FixedArray::kHeaderSize + kPointerSize));
HandleArrayCases(masm, feedback, receiver_map, scratch1, scratch2, false,
&miss);
__ bind(&miss);
KeyedStoreIC::GenerateMiss(masm);
__ bind(&load_smi_map);
__ LoadRoot(receiver_map, Heap::kHeapNumberMapRootIndex);
__ b(&compare_map);
}
void ProfileEntryHookStub::MaybeCallEntryHook(MacroAssembler* masm) {
if (masm->isolate()->function_entry_hook() != NULL) {
PredictableCodeSizeScope predictable(masm,
#if V8_TARGET_ARCH_S390X
40);
#elif V8_HOST_ARCH_S390
36);
#else
32);
#endif
ProfileEntryHookStub stub(masm->isolate());
__ CleanseP(r14);
__ Push(r14, ip);
__ CallStub(&stub); // BRASL
__ Pop(r14, ip);
}
}
void ProfileEntryHookStub::Generate(MacroAssembler* masm) {
// The entry hook is a "push lr" instruction (LAY+ST/STG), followed by a call.
#if V8_TARGET_ARCH_S390X
const int32_t kReturnAddressDistanceFromFunctionStart =
Assembler::kCallTargetAddressOffset + 18; // LAY + STG * 2
#elif V8_HOST_ARCH_S390
const int32_t kReturnAddressDistanceFromFunctionStart =
Assembler::kCallTargetAddressOffset + 18; // NILH + LAY + ST * 2
#else
const int32_t kReturnAddressDistanceFromFunctionStart =
Assembler::kCallTargetAddressOffset + 14; // LAY + ST * 2
#endif
// This should contain all kJSCallerSaved registers.
const RegList kSavedRegs = kJSCallerSaved | // Caller saved registers.
r7.bit(); // Saved stack pointer.
// We also save r14+ip, so count here is one higher than the mask indicates.
const int32_t kNumSavedRegs = kNumJSCallerSaved + 3;
// Save all caller-save registers as this may be called from anywhere.
__ CleanseP(r14);
__ LoadRR(ip, r14);
__ MultiPush(kSavedRegs | ip.bit());
// Compute the function's address for the first argument.
__ SubP(r2, ip, Operand(kReturnAddressDistanceFromFunctionStart));
// The caller's return address is two slots above the saved temporaries.
// Grab that for the second argument to the hook.
__ lay(r3, MemOperand(sp, kNumSavedRegs * kPointerSize));
// Align the stack if necessary.
int frame_alignment = masm->ActivationFrameAlignment();
if (frame_alignment > kPointerSize) {
__ LoadRR(r7, sp);
DCHECK(base::bits::IsPowerOfTwo32(frame_alignment));
__ ClearRightImm(sp, sp, Operand(WhichPowerOf2(frame_alignment)));
}
#if !defined(USE_SIMULATOR)
uintptr_t entry_hook =
reinterpret_cast<uintptr_t>(isolate()->function_entry_hook());
__ mov(ip, Operand(entry_hook));
#if ABI_USES_FUNCTION_DESCRIPTORS
// Function descriptor
__ LoadP(ToRegister(ABI_TOC_REGISTER), MemOperand(ip, kPointerSize));
__ LoadP(ip, MemOperand(ip, 0));
// ip already set.
#endif
#endif
// zLinux ABI requires caller's frame to have sufficient space for callee
// preserved regsiter save area.
__ LoadImmP(r0, Operand::Zero());
__ lay(sp, MemOperand(sp, -kCalleeRegisterSaveAreaSize -
kNumRequiredStackFrameSlots * kPointerSize));
__ StoreP(r0, MemOperand(sp));
#if defined(USE_SIMULATOR)
// Under the simulator we need to indirect the entry hook through a
// trampoline function at a known address.
// It additionally takes an isolate as a third parameter
__ mov(r4, Operand(ExternalReference::isolate_address(isolate())));
ApiFunction dispatcher(FUNCTION_ADDR(EntryHookTrampoline));
__ mov(ip, Operand(ExternalReference(
&dispatcher, ExternalReference::BUILTIN_CALL, isolate())));
#endif
__ Call(ip);
// zLinux ABI requires caller's frame to have sufficient space for callee
// preserved regsiter save area.
__ la(sp, MemOperand(sp, kCalleeRegisterSaveAreaSize +
kNumRequiredStackFrameSlots * kPointerSize));
// Restore the stack pointer if needed.
if (frame_alignment > kPointerSize) {
__ LoadRR(sp, r7);
}
// Also pop lr to get Ret(0).
__ MultiPop(kSavedRegs | ip.bit());
__ LoadRR(r14, ip);
__ Ret();
}
template <class T>
static void CreateArrayDispatch(MacroAssembler* masm,
AllocationSiteOverrideMode mode) {
if (mode == DISABLE_ALLOCATION_SITES) {
T stub(masm->isolate(), GetInitialFastElementsKind(), mode);
__ TailCallStub(&stub);
} else if (mode == DONT_OVERRIDE) {
int last_index =
GetSequenceIndexFromFastElementsKind(TERMINAL_FAST_ELEMENTS_KIND);
for (int i = 0; i <= last_index; ++i) {
ElementsKind kind = GetFastElementsKindFromSequenceIndex(i);
__ CmpP(r5, Operand(kind));
T stub(masm->isolate(), kind);
__ TailCallStub(&stub, eq);
}
// If we reached this point there is a problem.
__ Abort(kUnexpectedElementsKindInArrayConstructor);
} else {
UNREACHABLE();
}
}
static void CreateArrayDispatchOneArgument(MacroAssembler* masm,
AllocationSiteOverrideMode mode) {
// r4 - allocation site (if mode != DISABLE_ALLOCATION_SITES)
// r5 - kind (if mode != DISABLE_ALLOCATION_SITES)
// r2 - number of arguments
// r3 - constructor?
// sp[0] - last argument
Label normal_sequence;
if (mode == DONT_OVERRIDE) {
STATIC_ASSERT(FAST_SMI_ELEMENTS == 0);
STATIC_ASSERT(FAST_HOLEY_SMI_ELEMENTS == 1);
STATIC_ASSERT(FAST_ELEMENTS == 2);
STATIC_ASSERT(FAST_HOLEY_ELEMENTS == 3);
STATIC_ASSERT(FAST_DOUBLE_ELEMENTS == 4);
STATIC_ASSERT(FAST_HOLEY_DOUBLE_ELEMENTS == 5);
// is the low bit set? If so, we are holey and that is good.
__ AndP(r0, r5, Operand(1));
__ bne(&normal_sequence);
}
// look at the first argument
__ LoadP(r7, MemOperand(sp, 0));
__ CmpP(r7, Operand::Zero());
__ beq(&normal_sequence);
if (mode == DISABLE_ALLOCATION_SITES) {
ElementsKind initial = GetInitialFastElementsKind();
ElementsKind holey_initial = GetHoleyElementsKind(initial);
ArraySingleArgumentConstructorStub stub_holey(
masm->isolate(), holey_initial, DISABLE_ALLOCATION_SITES);
__ TailCallStub(&stub_holey);
__ bind(&normal_sequence);
ArraySingleArgumentConstructorStub stub(masm->isolate(), initial,
DISABLE_ALLOCATION_SITES);
__ TailCallStub(&stub);
} else if (mode == DONT_OVERRIDE) {
// We are going to create a holey array, but our kind is non-holey.
// Fix kind and retry (only if we have an allocation site in the slot).
__ AddP(r5, r5, Operand(1));
if (FLAG_debug_code) {
__ LoadP(r7, FieldMemOperand(r4, 0));
__ CompareRoot(r7, Heap::kAllocationSiteMapRootIndex);
__ Assert(eq, kExpectedAllocationSite);
}
// Save the resulting elements kind in type info. We can't just store r5
// in the AllocationSite::transition_info field because elements kind is
// restricted to a portion of the field...upper bits need to be left alone.
STATIC_ASSERT(AllocationSite::ElementsKindBits::kShift == 0);
__ LoadP(r6, FieldMemOperand(r4, AllocationSite::kTransitionInfoOffset));
__ AddSmiLiteral(r6, r6, Smi::FromInt(kFastElementsKindPackedToHoley), r0);
__ StoreP(r6, FieldMemOperand(r4, AllocationSite::kTransitionInfoOffset));
__ bind(&normal_sequence);
int last_index =
GetSequenceIndexFromFastElementsKind(TERMINAL_FAST_ELEMENTS_KIND);
for (int i = 0; i <= last_index; ++i) {
ElementsKind kind = GetFastElementsKindFromSequenceIndex(i);
__ CmpP(r5, Operand(kind));
ArraySingleArgumentConstructorStub stub(masm->isolate(), kind);
__ TailCallStub(&stub, eq);
}
// If we reached this point there is a problem.
__ Abort(kUnexpectedElementsKindInArrayConstructor);
} else {
UNREACHABLE();
}
}
template <class T>
static void ArrayConstructorStubAheadOfTimeHelper(Isolate* isolate) {
int to_index =
GetSequenceIndexFromFastElementsKind(TERMINAL_FAST_ELEMENTS_KIND);
for (int i = 0; i <= to_index; ++i) {
ElementsKind kind = GetFastElementsKindFromSequenceIndex(i);
T stub(isolate, kind);
stub.GetCode();
if (AllocationSite::GetMode(kind) != DONT_TRACK_ALLOCATION_SITE) {
T stub1(isolate, kind, DISABLE_ALLOCATION_SITES);
stub1.GetCode();
}
}
}
void CommonArrayConstructorStub::GenerateStubsAheadOfTime(Isolate* isolate) {
ArrayConstructorStubAheadOfTimeHelper<ArrayNoArgumentConstructorStub>(
isolate);
ArrayNArgumentsConstructorStub stub(isolate);
stub.GetCode();
ElementsKind kinds[2] = {FAST_ELEMENTS, FAST_HOLEY_ELEMENTS};
for (int i = 0; i < 2; i++) {
// For internal arrays we only need a few things
InternalArrayNoArgumentConstructorStub stubh1(isolate, kinds[i]);
stubh1.GetCode();
InternalArraySingleArgumentConstructorStub stubh2(isolate, kinds[i]);
stubh2.GetCode();
}
}
void ArrayConstructorStub::GenerateDispatchToArrayStub(
MacroAssembler* masm, AllocationSiteOverrideMode mode) {
Label not_zero_case, not_one_case;
__ CmpP(r2, Operand::Zero());
__ bne(¬_zero_case);
CreateArrayDispatch<ArrayNoArgumentConstructorStub>(masm, mode);
__ bind(¬_zero_case);
__ CmpP(r2, Operand(1));
__ bgt(¬_one_case);
CreateArrayDispatchOneArgument(masm, mode);
__ bind(¬_one_case);
ArrayNArgumentsConstructorStub stub(masm->isolate());
__ TailCallStub(&stub);
}
void ArrayConstructorStub::Generate(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- r2 : argc (only if argument_count() == ANY)
// -- r3 : constructor
// -- r4 : AllocationSite or undefined
// -- r5 : new target
// -- sp[0] : return address
// -- sp[4] : last argument
// -----------------------------------
if (FLAG_debug_code) {
// The array construct code is only set for the global and natives
// builtin Array functions which always have maps.
// Initial map for the builtin Array function should be a map.
__ LoadP(r6, FieldMemOperand(r3, JSFunction::kPrototypeOrInitialMapOffset));
// Will both indicate a NULL and a Smi.
__ TestIfSmi(r6);
__ Assert(ne, kUnexpectedInitialMapForArrayFunction, cr0);
__ CompareObjectType(r6, r6, r7, MAP_TYPE);
__ Assert(eq, kUnexpectedInitialMapForArrayFunction);
// We should either have undefined in r4 or a valid AllocationSite
__ AssertUndefinedOrAllocationSite(r4, r6);
}
// Enter the context of the Array function.
__ LoadP(cp, FieldMemOperand(r3, JSFunction::kContextOffset));
Label subclassing;
__ CmpP(r5, r3);
__ bne(&subclassing, Label::kNear);
Label no_info;
// Get the elements kind and case on that.
__ CompareRoot(r4, Heap::kUndefinedValueRootIndex);
__ beq(&no_info);
__ LoadP(r5, FieldMemOperand(r4, AllocationSite::kTransitionInfoOffset));
__ SmiUntag(r5);
STATIC_ASSERT(AllocationSite::ElementsKindBits::kShift == 0);
__ AndP(r5, Operand(AllocationSite::ElementsKindBits::kMask));
GenerateDispatchToArrayStub(masm, DONT_OVERRIDE);
__ bind(&no_info);
GenerateDispatchToArrayStub(masm, DISABLE_ALLOCATION_SITES);
__ bind(&subclassing);
__ ShiftLeftP(r1, r2, Operand(kPointerSizeLog2));
__ StoreP(r3, MemOperand(sp, r1));
__ AddP(r2, r2, Operand(3));
__ Push(r5, r4);
__ JumpToExternalReference(ExternalReference(Runtime::kNewArray, isolate()));
}
void InternalArrayConstructorStub::GenerateCase(MacroAssembler* masm,
ElementsKind kind) {
__ CmpLogicalP(r2, Operand(1));
InternalArrayNoArgumentConstructorStub stub0(isolate(), kind);
__ TailCallStub(&stub0, lt);
ArrayNArgumentsConstructorStub stubN(isolate());
__ TailCallStub(&stubN, gt);
if (IsFastPackedElementsKind(kind)) {
// We might need to create a holey array
// look at the first argument
__ LoadP(r5, MemOperand(sp, 0));
__ CmpP(r5, Operand::Zero());
InternalArraySingleArgumentConstructorStub stub1_holey(
isolate(), GetHoleyElementsKind(kind));
__ TailCallStub(&stub1_holey, ne);
}
InternalArraySingleArgumentConstructorStub stub1(isolate(), kind);
__ TailCallStub(&stub1);
}
void InternalArrayConstructorStub::Generate(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- r2 : argc
// -- r3 : constructor
// -- sp[0] : return address
// -- sp[4] : last argument
// -----------------------------------
if (FLAG_debug_code) {
// The array construct code is only set for the global and natives
// builtin Array functions which always have maps.
// Initial map for the builtin Array function should be a map.
__ LoadP(r5, FieldMemOperand(r3, JSFunction::kPrototypeOrInitialMapOffset));
// Will both indicate a NULL and a Smi.
__ TestIfSmi(r5);
__ Assert(ne, kUnexpectedInitialMapForArrayFunction, cr0);
__ CompareObjectType(r5, r5, r6, MAP_TYPE);
__ Assert(eq, kUnexpectedInitialMapForArrayFunction);
}
// Figure out the right elements kind
__ LoadP(r5, FieldMemOperand(r3, JSFunction::kPrototypeOrInitialMapOffset));
// Load the map's "bit field 2" into |result|.
__ LoadlB(r5, FieldMemOperand(r5, Map::kBitField2Offset));
// Retrieve elements_kind from bit field 2.
__ DecodeField<Map::ElementsKindBits>(r5);
if (FLAG_debug_code) {
Label done;
__ CmpP(r5, Operand(FAST_ELEMENTS));
__ beq(&done);
__ CmpP(r5, Operand(FAST_HOLEY_ELEMENTS));
__ Assert(eq, kInvalidElementsKindForInternalArrayOrInternalPackedArray);
__ bind(&done);
}
Label fast_elements_case;
__ CmpP(r5, Operand(FAST_ELEMENTS));
__ beq(&fast_elements_case);
GenerateCase(masm, FAST_HOLEY_ELEMENTS);
__ bind(&fast_elements_case);
GenerateCase(masm, FAST_ELEMENTS);
}
void FastNewObjectStub::Generate(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- r3 : target
// -- r5 : new target
// -- cp : context
// -- lr : return address
// -----------------------------------
__ AssertFunction(r3);
__ AssertReceiver(r5);
// Verify that the new target is a JSFunction.
Label new_object;
__ CompareObjectType(r5, r4, r4, JS_FUNCTION_TYPE);
__ bne(&new_object);
// Load the initial map and verify that it's in fact a map.
__ LoadP(r4, FieldMemOperand(r5, JSFunction::kPrototypeOrInitialMapOffset));
__ JumpIfSmi(r4, &new_object);
__ CompareObjectType(r4, r2, r2, MAP_TYPE);
__ bne(&new_object);
// Fall back to runtime if the target differs from the new target's
// initial map constructor.
__ LoadP(r2, FieldMemOperand(r4, Map::kConstructorOrBackPointerOffset));
__ CmpP(r2, r3);
__ bne(&new_object);
// Allocate the JSObject on the heap.
Label allocate, done_allocate;
__ LoadlB(r6, FieldMemOperand(r4, Map::kInstanceSizeOffset));
__ Allocate(r6, r2, r7, r8, &allocate, SIZE_IN_WORDS);
__ bind(&done_allocate);
// Initialize the JSObject fields.
__ StoreP(r4, FieldMemOperand(r2, JSObject::kMapOffset));
__ LoadRoot(r5, Heap::kEmptyFixedArrayRootIndex);
__ StoreP(r5, FieldMemOperand(r2, JSObject::kPropertiesOffset));
__ StoreP(r5, FieldMemOperand(r2, JSObject::kElementsOffset));
STATIC_ASSERT(JSObject::kHeaderSize == 3 * kPointerSize);
__ AddP(r3, r2, Operand(JSObject::kHeaderSize - kHeapObjectTag));
// ----------- S t a t e -------------
// -- r2 : result (tagged)
// -- r3 : result fields (untagged)
// -- r7 : result end (untagged)
// -- r4 : initial map
// -- cp : context
// -- lr : return address
// -----------------------------------
// Perform in-object slack tracking if requested.
Label slack_tracking;
STATIC_ASSERT(Map::kNoSlackTracking == 0);
__ LoadRoot(r8, Heap::kUndefinedValueRootIndex);
__ LoadlW(r5, FieldMemOperand(r4, Map::kBitField3Offset));
__ DecodeField<Map::ConstructionCounter>(r9, r5);
__ LoadAndTestP(r9, r9);
__ bne(&slack_tracking);
{
// Initialize all in-object fields with undefined.
__ InitializeFieldsWithFiller(r3, r7, r8);
__ Ret();
}
__ bind(&slack_tracking);
{
// Decrease generous allocation count.
STATIC_ASSERT(Map::ConstructionCounter::kNext == 32);
__ Add32(r5, r5, Operand(-(1 << Map::ConstructionCounter::kShift)));
__ StoreW(r5, FieldMemOperand(r4, Map::kBitField3Offset));
// Initialize the in-object fields with undefined.
__ LoadlB(r6, FieldMemOperand(r4, Map::kUnusedPropertyFieldsOffset));
__ ShiftLeftP(r6, r6, Operand(kPointerSizeLog2));
__ SubP(r6, r7, r6);
__ InitializeFieldsWithFiller(r3, r6, r8);
// Initialize the remaining (reserved) fields with one pointer filler map.
__ LoadRoot(r8, Heap::kOnePointerFillerMapRootIndex);
__ InitializeFieldsWithFiller(r3, r7, r8);
// Check if we can finalize the instance size.
__ CmpP(r9, Operand(Map::kSlackTrackingCounterEnd));
__ Ret(ne);
// Finalize the instance size.
{
FrameAndConstantPoolScope scope(masm, StackFrame::INTERNAL);
__ Push(r2, r4);
__ CallRuntime(Runtime::kFinalizeInstanceSize);
__ Pop(r2);
}
__ Ret();
}
// Fall back to %AllocateInNewSpace.
__ bind(&allocate);
{
FrameAndConstantPoolScope scope(masm, StackFrame::INTERNAL);
STATIC_ASSERT(kSmiTag == 0);
__ ShiftLeftP(r6, r6,
Operand(kPointerSizeLog2 + kSmiTagSize + kSmiShiftSize));
__ Push(r4, r6);
__ CallRuntime(Runtime::kAllocateInNewSpace);
__ Pop(r4);
}
__ LoadlB(r7, FieldMemOperand(r4, Map::kInstanceSizeOffset));
__ ShiftLeftP(r7, r7, Operand(kPointerSizeLog2));
__ AddP(r7, r2, r7);
__ SubP(r7, r7, Operand(kHeapObjectTag));
__ b(&done_allocate);
// Fall back to %NewObject.
__ bind(&new_object);
__ Push(r3, r5);
__ TailCallRuntime(Runtime::kNewObject);
}
void FastNewRestParameterStub::Generate(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- r3 : function
// -- cp : context
// -- fp : frame pointer
// -- lr : return address
// -----------------------------------
__ AssertFunction(r3);
// Make r4 point to the JavaScript frame.
__ LoadRR(r4, fp);
if (skip_stub_frame()) {
// For Ignition we need to skip the handler/stub frame to reach the
// JavaScript frame for the function.
__ LoadP(r4, MemOperand(r4, StandardFrameConstants::kCallerFPOffset));
}
if (FLAG_debug_code) {
Label ok;
__ LoadP(ip, MemOperand(r4, StandardFrameConstants::kFunctionOffset));
__ CmpP(ip, r3);
__ b(&ok, Label::kNear);
__ Abort(kInvalidFrameForFastNewRestArgumentsStub);
__ bind(&ok);
}
// Check if we have rest parameters (only possible if we have an
// arguments adaptor frame below the function frame).
Label no_rest_parameters;
__ LoadP(r4, MemOperand(r4, StandardFrameConstants::kCallerFPOffset));
__ LoadP(ip, MemOperand(r4, CommonFrameConstants::kContextOrFrameTypeOffset));
__ CmpSmiLiteral(ip, Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR), r0);
__ bne(&no_rest_parameters);
// Check if the arguments adaptor frame contains more arguments than
// specified by the function's internal formal parameter count.
Label rest_parameters;
__ LoadP(r2, MemOperand(r4, ArgumentsAdaptorFrameConstants::kLengthOffset));
__ LoadP(r5, FieldMemOperand(r3, JSFunction::kSharedFunctionInfoOffset));
__ LoadW(
r5, FieldMemOperand(r5, SharedFunctionInfo::kFormalParameterCountOffset));
#if V8_TARGET_ARCH_S390X
__ SmiTag(r5);
#endif
__ SubP(r2, r2, r5);
__ bgt(&rest_parameters);
// Return an empty rest parameter array.
__ bind(&no_rest_parameters);
{
// ----------- S t a t e -------------
// -- cp : context
// -- lr : return address
// -----------------------------------
// Allocate an empty rest parameter array.
Label allocate, done_allocate;
__ Allocate(JSArray::kSize, r2, r3, r4, &allocate, NO_ALLOCATION_FLAGS);
__ bind(&done_allocate);
// Setup the rest parameter array in r0.
__ LoadNativeContextSlot(Context::JS_ARRAY_FAST_ELEMENTS_MAP_INDEX, r3);
__ StoreP(r3, FieldMemOperand(r2, JSArray::kMapOffset), r0);
__ LoadRoot(r3, Heap::kEmptyFixedArrayRootIndex);
__ StoreP(r3, FieldMemOperand(r2, JSArray::kPropertiesOffset), r0);
__ StoreP(r3, FieldMemOperand(r2, JSArray::kElementsOffset), r0);
__ LoadImmP(r3, Operand::Zero());
__ StoreP(r3, FieldMemOperand(r2, JSArray::kLengthOffset), r0);
STATIC_ASSERT(JSArray::kSize == 4 * kPointerSize);
__ Ret();
// Fall back to %AllocateInNewSpace.
__ bind(&allocate);
{
FrameAndConstantPoolScope scope(masm, StackFrame::INTERNAL);
__ Push(Smi::FromInt(JSArray::kSize));
__ CallRuntime(Runtime::kAllocateInNewSpace);
}
__ b(&done_allocate);
}
__ bind(&rest_parameters);
{
// Compute the pointer to the first rest parameter (skippping the receiver).
__ SmiToPtrArrayOffset(r8, r2);
__ AddP(r4, r4, r8);
__ AddP(r4, r4, Operand(StandardFrameConstants::kCallerSPOffset));
// ----------- S t a t e -------------
// -- cp : context
// -- r2 : number of rest parameters (tagged)
// -- r3 : function
// -- r4 : pointer just past first rest parameters
// -- r8 : size of rest parameters
// -- lr : return address
// -----------------------------------
// Allocate space for the rest parameter array plus the backing store.
Label allocate, done_allocate;
__ mov(r9, Operand(JSArray::kSize + FixedArray::kHeaderSize));
__ AddP(r9, r9, r8);
__ Allocate(r9, r5, r6, r7, &allocate, NO_ALLOCATION_FLAGS);
__ bind(&done_allocate);
// Setup the elements array in r5.
__ LoadRoot(r3, Heap::kFixedArrayMapRootIndex);
__ StoreP(r3, FieldMemOperand(r5, FixedArray::kMapOffset), r0);
__ StoreP(r2, FieldMemOperand(r5, FixedArray::kLengthOffset), r0);
__ AddP(r6, r5,
Operand(FixedArray::kHeaderSize - kHeapObjectTag - kPointerSize));
{
Label loop;
__ SmiUntag(r1, r2);
// __ mtctr(r0);
__ bind(&loop);
__ lay(r4, MemOperand(r4, -kPointerSize));
__ LoadP(ip, MemOperand(r4));
__ la(r6, MemOperand(r6, kPointerSize));
__ StoreP(ip, MemOperand(r6));
// __ bdnz(&loop);
__ BranchOnCount(r1, &loop);
__ AddP(r6, r6, Operand(kPointerSize));
}
// Setup the rest parameter array in r6.
__ LoadNativeContextSlot(Context::JS_ARRAY_FAST_ELEMENTS_MAP_INDEX, r3);
__ StoreP(r3, MemOperand(r6, JSArray::kMapOffset));
__ LoadRoot(r3, Heap::kEmptyFixedArrayRootIndex);
__ StoreP(r3, MemOperand(r6, JSArray::kPropertiesOffset));
__ StoreP(r5, MemOperand(r6, JSArray::kElementsOffset));
__ StoreP(r2, MemOperand(r6, JSArray::kLengthOffset));
STATIC_ASSERT(JSArray::kSize == 4 * kPointerSize);
__ AddP(r2, r6, Operand(kHeapObjectTag));
__ Ret();
// Fall back to %AllocateInNewSpace (if not too big).
Label too_big_for_new_space;
__ bind(&allocate);
__ CmpP(r9, Operand(kMaxRegularHeapObjectSize));
__ bgt(&too_big_for_new_space);
{
FrameAndConstantPoolScope scope(masm, StackFrame::INTERNAL);
__ SmiTag(r9);
__ Push(r2, r4, r9);
__ CallRuntime(Runtime::kAllocateInNewSpace);
__ LoadRR(r5, r2);
__ Pop(r2, r4);
}
__ b(&done_allocate);
// Fall back to %NewRestParameter.
__ bind(&too_big_for_new_space);
__ push(r3);
__ TailCallRuntime(Runtime::kNewRestParameter);
}
}
void FastNewSloppyArgumentsStub::Generate(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- r3 : function
// -- cp : context
// -- fp : frame pointer
// -- lr : return address
// -----------------------------------
__ AssertFunction(r3);
// Make r9 point to the JavaScript frame.
__ LoadRR(r9, fp);
if (skip_stub_frame()) {
// For Ignition we need to skip the handler/stub frame to reach the
// JavaScript frame for the function.
__ LoadP(r9, MemOperand(r9, StandardFrameConstants::kCallerFPOffset));
}
if (FLAG_debug_code) {
Label ok;
__ LoadP(ip, MemOperand(r9, StandardFrameConstants::kFunctionOffset));
__ CmpP(ip, r3);
__ beq(&ok, Label::kNear);
__ Abort(kInvalidFrameForFastNewRestArgumentsStub);
__ bind(&ok);
}
// TODO(bmeurer): Cleanup to match the FastNewStrictArgumentsStub.
__ LoadP(r4, FieldMemOperand(r3, JSFunction::kSharedFunctionInfoOffset));
__ LoadW(
r4, FieldMemOperand(r4, SharedFunctionInfo::kFormalParameterCountOffset));
#if V8_TARGET_ARCH_S390X
__ SmiTag(r4);
#endif
__ SmiToPtrArrayOffset(r5, r4);
__ AddP(r5, r9, r5);
__ AddP(r5, r5, Operand(StandardFrameConstants::kCallerSPOffset));
// r3 : function
// r4 : number of parameters (tagged)
// r5 : parameters pointer
// r9 : JavaScript frame pointer
// Registers used over whole function:
// r7 : arguments count (tagged)
// r8 : mapped parameter count (tagged)
// Check if the calling frame is an arguments adaptor frame.
Label adaptor_frame, try_allocate, runtime;
__ LoadP(r6, MemOperand(r9, StandardFrameConstants::kCallerFPOffset));
__ LoadP(r2, MemOperand(r6, CommonFrameConstants::kContextOrFrameTypeOffset));
__ CmpSmiLiteral(r2, Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR), r0);
__ beq(&adaptor_frame);
// No adaptor, parameter count = argument count.
__ LoadRR(r7, r4);
__ LoadRR(r8, r4);
__ b(&try_allocate);
// We have an adaptor frame. Patch the parameters pointer.
__ bind(&adaptor_frame);
__ LoadP(r7, MemOperand(r6, ArgumentsAdaptorFrameConstants::kLengthOffset));
__ SmiToPtrArrayOffset(r5, r7);
__ AddP(r5, r5, r6);
__ AddP(r5, r5, Operand(StandardFrameConstants::kCallerSPOffset));
// r7 = argument count (tagged)
// r8 = parameter count (tagged)
// Compute the mapped parameter count = min(r4, r7) in r8.
__ CmpP(r4, r7);
Label skip;
__ LoadRR(r8, r4);
__ blt(&skip);
__ LoadRR(r8, r7);
__ bind(&skip);
__ bind(&try_allocate);
// Compute the sizes of backing store, parameter map, and arguments object.
// 1. Parameter map, has 2 extra words containing context and backing store.
const int kParameterMapHeaderSize =
FixedArray::kHeaderSize + 2 * kPointerSize;
// If there are no mapped parameters, we do not need the parameter_map.
__ CmpSmiLiteral(r8, Smi::kZero, r0);
Label skip2, skip3;
__ bne(&skip2);
__ LoadImmP(r1, Operand::Zero());
__ b(&skip3);
__ bind(&skip2);
__ SmiToPtrArrayOffset(r1, r8);
__ AddP(r1, r1, Operand(kParameterMapHeaderSize));
__ bind(&skip3);
// 2. Backing store.
__ SmiToPtrArrayOffset(r6, r7);
__ AddP(r1, r1, r6);
__ AddP(r1, r1, Operand(FixedArray::kHeaderSize));
// 3. Arguments object.
__ AddP(r1, r1, Operand(JSSloppyArgumentsObject::kSize));
// Do the allocation of all three objects in one go.
__ Allocate(r1, r2, r1, r6, &runtime, NO_ALLOCATION_FLAGS);
// r2 = address of new object(s) (tagged)
// r4 = argument count (smi-tagged)
// Get the arguments boilerplate from the current native context into r3.
const int kNormalOffset =
Context::SlotOffset(Context::SLOPPY_ARGUMENTS_MAP_INDEX);
const int kAliasedOffset =
Context::SlotOffset(Context::FAST_ALIASED_ARGUMENTS_MAP_INDEX);
__ LoadP(r6, NativeContextMemOperand());
__ CmpP(r8, Operand::Zero());
Label skip4, skip5;
__ bne(&skip4);
__ LoadP(r6, MemOperand(r6, kNormalOffset));
__ b(&skip5);
__ bind(&skip4);
__ LoadP(r6, MemOperand(r6, kAliasedOffset));
__ bind(&skip5);
// r2 = address of new object (tagged)
// r4 = argument count (smi-tagged)
// r6 = address of arguments map (tagged)
// r8 = mapped parameter count (tagged)
__ StoreP(r6, FieldMemOperand(r2, JSObject::kMapOffset), r0);
__ LoadRoot(r1, Heap::kEmptyFixedArrayRootIndex);
__ StoreP(r1, FieldMemOperand(r2, JSObject::kPropertiesOffset), r0);
__ StoreP(r1, FieldMemOperand(r2, JSObject::kElementsOffset), r0);
// Set up the callee in-object property.
__ AssertNotSmi(r3);
__ StoreP(r3, FieldMemOperand(r2, JSSloppyArgumentsObject::kCalleeOffset),
r0);
// Use the length (smi tagged) and set that as an in-object property too.
__ AssertSmi(r7);
__ StoreP(r7, FieldMemOperand(r2, JSSloppyArgumentsObject::kLengthOffset),
r0);
// Set up the elements pointer in the allocated arguments object.
// If we allocated a parameter map, r6 will point there, otherwise
// it will point to the backing store.
__ AddP(r6, r2, Operand(JSSloppyArgumentsObject::kSize));
__ StoreP(r6, FieldMemOperand(r2, JSObject::kElementsOffset), r0);
// r2 = address of new object (tagged)
// r4 = argument count (tagged)
// r6 = address of parameter map or backing store (tagged)
// r8 = mapped parameter count (tagged)
// Initialize parameter map. If there are no mapped arguments, we're done.
Label skip_parameter_map;
__ CmpSmiLiteral(r8, Smi::kZero, r0);
Label skip6;
__ bne(&skip6);
// Move backing store address to r3, because it is
// expected there when filling in the unmapped arguments.
__ LoadRR(r3, r6);
__ b(&skip_parameter_map);
__ bind(&skip6);
__ LoadRoot(r7, Heap::kSloppyArgumentsElementsMapRootIndex);
__ StoreP(r7, FieldMemOperand(r6, FixedArray::kMapOffset), r0);
__ AddSmiLiteral(r7, r8, Smi::FromInt(2), r0);
__ StoreP(r7, FieldMemOperand(r6, FixedArray::kLengthOffset), r0);
__ StoreP(cp, FieldMemOperand(r6, FixedArray::kHeaderSize + 0 * kPointerSize),
r0);
__ SmiToPtrArrayOffset(r7, r8);
__ AddP(r7, r7, r6);
__ AddP(r7, r7, Operand(kParameterMapHeaderSize));
__ StoreP(r7, FieldMemOperand(r6, FixedArray::kHeaderSize + 1 * kPointerSize),
r0);
// Copy the parameter slots and the holes in the arguments.
// We need to fill in mapped_parameter_count slots. They index the context,
// where parameters are stored in reverse order, at
// MIN_CONTEXT_SLOTS .. MIN_CONTEXT_SLOTS+parameter_count-1
// The mapped parameter thus need to get indices
// MIN_CONTEXT_SLOTS+parameter_count-1 ..
// MIN_CONTEXT_SLOTS+parameter_count-mapped_parameter_count
// We loop from right to left.
Label parameters_loop;
__ LoadRR(r7, r8);
__ AddSmiLiteral(r1, r4, Smi::FromInt(Context::MIN_CONTEXT_SLOTS), r0);
__ SubP(r1, r1, r8);
__ LoadRoot(ip, Heap::kTheHoleValueRootIndex);
__ SmiToPtrArrayOffset(r3, r7);
__ AddP(r3, r3, r6);
__ AddP(r3, r3, Operand(kParameterMapHeaderSize));
// r3 = address of backing store (tagged)
// r6 = address of parameter map (tagged)
// r7 = temporary scratch (a.o., for address calculation)
// r9 = temporary scratch (a.o., for address calculation)
// ip = the hole value
__ SmiUntag(r7);
__ push(r4);
__ LoadRR(r4, r7);
__ ShiftLeftP(r7, r7, Operand(kPointerSizeLog2));
__ AddP(r9, r3, r7);
__ AddP(r7, r6, r7);
__ AddP(r9, r9, Operand(FixedArray::kHeaderSize - kHeapObjectTag));
__ AddP(r7, r7, Operand(kParameterMapHeaderSize - kHeapObjectTag));
__ bind(¶meters_loop);
__ StoreP(r1, MemOperand(r7, -kPointerSize));
__ lay(r7, MemOperand(r7, -kPointerSize));
__ StoreP(ip, MemOperand(r9, -kPointerSize));
__ lay(r9, MemOperand(r9, -kPointerSize));
__ AddSmiLiteral(r1, r1, Smi::FromInt(1), r0);
__ BranchOnCount(r4, ¶meters_loop);
__ pop(r4);
// Restore r7 = argument count (tagged).
__ LoadP(r7, FieldMemOperand(r2, JSSloppyArgumentsObject::kLengthOffset));
__ bind(&skip_parameter_map);
// r2 = address of new object (tagged)
// r3 = address of backing store (tagged)
// r7 = argument count (tagged)
// r8 = mapped parameter count (tagged)
// r1 = scratch
// Copy arguments header and remaining slots (if there are any).
__ LoadRoot(r1, Heap::kFixedArrayMapRootIndex);
__ StoreP(r1, FieldMemOperand(r3, FixedArray::kMapOffset), r0);
__ StoreP(r7, FieldMemOperand(r3, FixedArray::kLengthOffset), r0);
__ SubP(r1, r7, r8);
__ Ret(eq);
Label arguments_loop;
__ SmiUntag(r1);
__ LoadRR(r4, r1);
__ SmiToPtrArrayOffset(r0, r8);
__ SubP(r5, r5, r0);
__ AddP(r1, r3, r0);
__ AddP(r1, r1,
Operand(FixedArray::kHeaderSize - kHeapObjectTag - kPointerSize));
__ bind(&arguments_loop);
__ LoadP(r6, MemOperand(r5, -kPointerSize));
__ lay(r5, MemOperand(r5, -kPointerSize));
__ StoreP(r6, MemOperand(r1, kPointerSize));
__ la(r1, MemOperand(r1, kPointerSize));
__ BranchOnCount(r4, &arguments_loop);
// Return.
__ Ret();
// Do the runtime call to allocate the arguments object.
// r7 = argument count (tagged)
__ bind(&runtime);
__ Push(r3, r5, r7);
__ TailCallRuntime(Runtime::kNewSloppyArguments);
}
void FastNewStrictArgumentsStub::Generate(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- r3 : function
// -- cp : context
// -- fp : frame pointer
// -- lr : return address
// -----------------------------------
__ AssertFunction(r3);
// Make r4 point to the JavaScript frame.
__ LoadRR(r4, fp);
if (skip_stub_frame()) {
// For Ignition we need to skip the handler/stub frame to reach the
// JavaScript frame for the function.
__ LoadP(r4, MemOperand(r4, StandardFrameConstants::kCallerFPOffset));
}
if (FLAG_debug_code) {
Label ok;
__ LoadP(ip, MemOperand(r4, StandardFrameConstants::kFunctionOffset));
__ CmpP(ip, r3);
__ beq(&ok, Label::kNear);
__ Abort(kInvalidFrameForFastNewRestArgumentsStub);
__ bind(&ok);
}
// Check if we have an arguments adaptor frame below the function frame.
Label arguments_adaptor, arguments_done;
__ LoadP(r5, MemOperand(r4, StandardFrameConstants::kCallerFPOffset));
__ LoadP(ip, MemOperand(r5, CommonFrameConstants::kContextOrFrameTypeOffset));
__ CmpSmiLiteral(ip, Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR), r0);
__ beq(&arguments_adaptor);
{
__ LoadP(r6, FieldMemOperand(r3, JSFunction::kSharedFunctionInfoOffset));
__ LoadW(r2, FieldMemOperand(
r6, SharedFunctionInfo::kFormalParameterCountOffset));
#if V8_TARGET_ARCH_S390X
__ SmiTag(r2);
#endif
__ SmiToPtrArrayOffset(r8, r2);
__ AddP(r4, r4, r8);
}
__ b(&arguments_done);
__ bind(&arguments_adaptor);
{
__ LoadP(r2, MemOperand(r5, ArgumentsAdaptorFrameConstants::kLengthOffset));
__ SmiToPtrArrayOffset(r8, r2);
__ AddP(r4, r5, r8);
}
__ bind(&arguments_done);
__ AddP(r4, r4, Operand(StandardFrameConstants::kCallerSPOffset));
// ----------- S t a t e -------------
// -- cp : context
// -- r2 : number of rest parameters (tagged)
// -- r3 : function
// -- r4 : pointer just past first rest parameters
// -- r8 : size of rest parameters
// -- lr : return address
// -----------------------------------
// Allocate space for the strict arguments object plus the backing store.
Label allocate, done_allocate;
__ mov(r9, Operand(JSStrictArgumentsObject::kSize + FixedArray::kHeaderSize));
__ AddP(r9, r9, r8);
__ Allocate(r9, r5, r6, r7, &allocate, NO_ALLOCATION_FLAGS);
__ bind(&done_allocate);
// Setup the elements array in r5.
__ LoadRoot(r3, Heap::kFixedArrayMapRootIndex);
__ StoreP(r3, FieldMemOperand(r5, FixedArray::kMapOffset), r0);
__ StoreP(r2, FieldMemOperand(r5, FixedArray::kLengthOffset), r0);
__ AddP(r6, r5,
Operand(FixedArray::kHeaderSize - kHeapObjectTag - kPointerSize));
{
Label loop, done_loop;
__ SmiUntag(r1, r2);
__ LoadAndTestP(r1, r1);
__ beq(&done_loop);
__ bind(&loop);
__ lay(r4, MemOperand(r4, -kPointerSize));
__ LoadP(ip, MemOperand(r4));
__ la(r6, MemOperand(r6, kPointerSize));
__ StoreP(ip, MemOperand(r6));
__ BranchOnCount(r1, &loop);
__ bind(&done_loop);
__ AddP(r6, r6, Operand(kPointerSize));
}
// Setup the rest parameter array in r6.
__ LoadNativeContextSlot(Context::STRICT_ARGUMENTS_MAP_INDEX, r3);
__ StoreP(r3, MemOperand(r6, JSStrictArgumentsObject::kMapOffset));
__ LoadRoot(r3, Heap::kEmptyFixedArrayRootIndex);
__ StoreP(r3, MemOperand(r6, JSStrictArgumentsObject::kPropertiesOffset));
__ StoreP(r5, MemOperand(r6, JSStrictArgumentsObject::kElementsOffset));
__ StoreP(r2, MemOperand(r6, JSStrictArgumentsObject::kLengthOffset));
STATIC_ASSERT(JSStrictArgumentsObject::kSize == 4 * kPointerSize);
__ AddP(r2, r6, Operand(kHeapObjectTag));
__ Ret();
// Fall back to %AllocateInNewSpace (if not too big).
Label too_big_for_new_space;
__ bind(&allocate);
__ CmpP(r9, Operand(kMaxRegularHeapObjectSize));
__ bgt(&too_big_for_new_space);
{
FrameAndConstantPoolScope scope(masm, StackFrame::INTERNAL);
__ SmiTag(r9);
__ Push(r2, r4, r9);
__ CallRuntime(Runtime::kAllocateInNewSpace);
__ LoadRR(r5, r2);
__ Pop(r2, r4);
}
__ b(&done_allocate);
// Fall back to %NewStrictArguments.
__ bind(&too_big_for_new_space);
__ push(r3);
__ TailCallRuntime(Runtime::kNewStrictArguments);
}
static int AddressOffset(ExternalReference ref0, ExternalReference ref1) {
return ref0.address() - ref1.address();
}
// Calls an API function. Allocates HandleScope, extracts returned value
// from handle and propagates exceptions. Restores context. stack_space
// - space to be unwound on exit (includes the call JS arguments space and
// the additional space allocated for the fast call).
static void CallApiFunctionAndReturn(MacroAssembler* masm,
Register function_address,
ExternalReference thunk_ref,
int stack_space,
MemOperand* stack_space_operand,
MemOperand return_value_operand,
MemOperand* context_restore_operand) {
Isolate* isolate = masm->isolate();
ExternalReference next_address =
ExternalReference::handle_scope_next_address(isolate);
const int kNextOffset = 0;
const int kLimitOffset = AddressOffset(
ExternalReference::handle_scope_limit_address(isolate), next_address);
const int kLevelOffset = AddressOffset(
ExternalReference::handle_scope_level_address(isolate), next_address);
// Additional parameter is the address of the actual callback.
DCHECK(function_address.is(r3) || function_address.is(r4));
Register scratch = r5;
__ mov(scratch, Operand(ExternalReference::is_profiling_address(isolate)));
__ LoadlB(scratch, MemOperand(scratch, 0));
__ CmpP(scratch, Operand::Zero());
Label profiler_disabled;
Label end_profiler_check;
__ beq(&profiler_disabled, Label::kNear);
__ mov(scratch, Operand(thunk_ref));
__ b(&end_profiler_check, Label::kNear);
__ bind(&profiler_disabled);
__ LoadRR(scratch, function_address);
__ bind(&end_profiler_check);
// Allocate HandleScope in callee-save registers.
// r9 - next_address
// r6 - next_address->kNextOffset
// r7 - next_address->kLimitOffset
// r8 - next_address->kLevelOffset
__ mov(r9, Operand(next_address));
__ LoadP(r6, MemOperand(r9, kNextOffset));
__ LoadP(r7, MemOperand(r9, kLimitOffset));
__ LoadlW(r8, MemOperand(r9, kLevelOffset));
__ AddP(r8, Operand(1));
__ StoreW(r8, MemOperand(r9, kLevelOffset));
if (FLAG_log_timer_events) {
FrameScope frame(masm, StackFrame::MANUAL);
__ PushSafepointRegisters();
__ PrepareCallCFunction(1, r2);
__ mov(r2, Operand(ExternalReference::isolate_address(isolate)));
__ CallCFunction(ExternalReference::log_enter_external_function(isolate),
1);
__ PopSafepointRegisters();
}
// Native call returns to the DirectCEntry stub which redirects to the
// return address pushed on stack (could have moved after GC).
// DirectCEntry stub itself is generated early and never moves.
DirectCEntryStub stub(isolate);
stub.GenerateCall(masm, scratch);
if (FLAG_log_timer_events) {
FrameScope frame(masm, StackFrame::MANUAL);
__ PushSafepointRegisters();
__ PrepareCallCFunction(1, r2);
__ mov(r2, Operand(ExternalReference::isolate_address(isolate)));
__ CallCFunction(ExternalReference::log_leave_external_function(isolate),
1);
__ PopSafepointRegisters();
}
Label promote_scheduled_exception;
Label delete_allocated_handles;
Label leave_exit_frame;
Label return_value_loaded;
// load value from ReturnValue
__ LoadP(r2, return_value_operand);
__ bind(&return_value_loaded);
// No more valid handles (the result handle was the last one). Restore
// previous handle scope.
__ StoreP(r6, MemOperand(r9, kNextOffset));
if (__ emit_debug_code()) {
__ LoadlW(r3, MemOperand(r9, kLevelOffset));
__ CmpP(r3, r8);
__ Check(eq, kUnexpectedLevelAfterReturnFromApiCall);
}
__ SubP(r8, Operand(1));
__ StoreW(r8, MemOperand(r9, kLevelOffset));
__ CmpP(r7, MemOperand(r9, kLimitOffset));
__ bne(&delete_allocated_handles, Label::kNear);
// Leave the API exit frame.
__ bind(&leave_exit_frame);
bool restore_context = context_restore_operand != NULL;
if (restore_context) {
__ LoadP(cp, *context_restore_operand);
}
// LeaveExitFrame expects unwind space to be in a register.
if (stack_space_operand != NULL) {
__ l(r6, *stack_space_operand);
} else {
__ mov(r6, Operand(stack_space));
}
__ LeaveExitFrame(false, r6, !restore_context, stack_space_operand != NULL);
// Check if the function scheduled an exception.
__ mov(r7, Operand(ExternalReference::scheduled_exception_address(isolate)));
__ LoadP(r7, MemOperand(r7));
__ CompareRoot(r7, Heap::kTheHoleValueRootIndex);
__ bne(&promote_scheduled_exception, Label::kNear);
__ b(r14);
// Re-throw by promoting a scheduled exception.
__ bind(&promote_scheduled_exception);
__ TailCallRuntime(Runtime::kPromoteScheduledException);
// HandleScope limit has changed. Delete allocated extensions.
__ bind(&delete_allocated_handles);
__ StoreP(r7, MemOperand(r9, kLimitOffset));
__ LoadRR(r6, r2);
__ PrepareCallCFunction(1, r7);
__ mov(r2, Operand(ExternalReference::isolate_address(isolate)));
__ CallCFunction(ExternalReference::delete_handle_scope_extensions(isolate),
1);
__ LoadRR(r2, r6);
__ b(&leave_exit_frame, Label::kNear);
}
void CallApiCallbackStub::Generate(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- r2 : callee
// -- r6 : call_data
// -- r4 : holder
// -- r3 : api_function_address
// -- cp : context
// --
// -- sp[0] : last argument
// -- ...
// -- sp[(argc - 1)* 4] : first argument
// -- sp[argc * 4] : receiver
// -----------------------------------
Register callee = r2;
Register call_data = r6;
Register holder = r4;
Register api_function_address = r3;
Register context = cp;
typedef FunctionCallbackArguments FCA;
STATIC_ASSERT(FCA::kContextSaveIndex == 6);
STATIC_ASSERT(FCA::kCalleeIndex == 5);
STATIC_ASSERT(FCA::kDataIndex == 4);
STATIC_ASSERT(FCA::kReturnValueOffset == 3);
STATIC_ASSERT(FCA::kReturnValueDefaultValueIndex == 2);
STATIC_ASSERT(FCA::kIsolateIndex == 1);
STATIC_ASSERT(FCA::kHolderIndex == 0);
STATIC_ASSERT(FCA::kNewTargetIndex == 7);
STATIC_ASSERT(FCA::kArgsLength == 8);
// new target
__ PushRoot(Heap::kUndefinedValueRootIndex);
// context save
__ push(context);
if (!is_lazy()) {
// load context from callee
__ LoadP(context, FieldMemOperand(callee, JSFunction::kContextOffset));
}
// callee
__ push(callee);
// call data
__ push(call_data);
Register scratch = call_data;
if (!call_data_undefined()) {
__ LoadRoot(scratch, Heap::kUndefinedValueRootIndex);
}
// return value
__ push(scratch);
// return value default
__ push(scratch);
// isolate
__ mov(scratch, Operand(ExternalReference::isolate_address(masm->isolate())));
__ push(scratch);
// holder
__ push(holder);
// Prepare arguments.
__ LoadRR(scratch, sp);
// Allocate the v8::Arguments structure in the arguments' space since
// it's not controlled by GC.
// S390 LINUX ABI:
//
// Create 4 extra slots on stack:
// [0] space for DirectCEntryStub's LR save
// [1-3] FunctionCallbackInfo
const int kApiStackSpace = 4;
const int kFunctionCallbackInfoOffset =
(kStackFrameExtraParamSlot + 1) * kPointerSize;
FrameScope frame_scope(masm, StackFrame::MANUAL);
__ EnterExitFrame(false, kApiStackSpace);
DCHECK(!api_function_address.is(r2) && !scratch.is(r2));
// r2 = FunctionCallbackInfo&
// Arguments is after the return address.
__ AddP(r2, sp, Operand(kFunctionCallbackInfoOffset));
// FunctionCallbackInfo::implicit_args_
__ StoreP(scratch, MemOperand(r2, 0 * kPointerSize));
// FunctionCallbackInfo::values_
__ AddP(ip, scratch, Operand((FCA::kArgsLength - 1 + argc()) * kPointerSize));
__ StoreP(ip, MemOperand(r2, 1 * kPointerSize));
// FunctionCallbackInfo::length_ = argc
__ LoadImmP(ip, Operand(argc()));
__ StoreW(ip, MemOperand(r2, 2 * kPointerSize));
ExternalReference thunk_ref =
ExternalReference::invoke_function_callback(masm->isolate());
AllowExternalCallThatCantCauseGC scope(masm);
MemOperand context_restore_operand(
fp, (2 + FCA::kContextSaveIndex) * kPointerSize);
// Stores return the first js argument
int return_value_offset = 0;
if (is_store()) {
return_value_offset = 2 + FCA::kArgsLength;
} else {
return_value_offset = 2 + FCA::kReturnValueOffset;
}
MemOperand return_value_operand(fp, return_value_offset * kPointerSize);
int stack_space = 0;
MemOperand length_operand =
MemOperand(sp, kFunctionCallbackInfoOffset + 2 * kPointerSize);
MemOperand* stack_space_operand = &length_operand;
stack_space = argc() + FCA::kArgsLength + 1;
stack_space_operand = NULL;
CallApiFunctionAndReturn(masm, api_function_address, thunk_ref, stack_space,
stack_space_operand, return_value_operand,
&context_restore_operand);
}
void CallApiGetterStub::Generate(MacroAssembler* masm) {
int arg0Slot = 0;
int accessorInfoSlot = 0;
int apiStackSpace = 0;
// Build v8::PropertyCallbackInfo::args_ array on the stack and push property
// name below the exit frame to make GC aware of them.
STATIC_ASSERT(PropertyCallbackArguments::kShouldThrowOnErrorIndex == 0);
STATIC_ASSERT(PropertyCallbackArguments::kHolderIndex == 1);
STATIC_ASSERT(PropertyCallbackArguments::kIsolateIndex == 2);
STATIC_ASSERT(PropertyCallbackArguments::kReturnValueDefaultValueIndex == 3);
STATIC_ASSERT(PropertyCallbackArguments::kReturnValueOffset == 4);
STATIC_ASSERT(PropertyCallbackArguments::kDataIndex == 5);
STATIC_ASSERT(PropertyCallbackArguments::kThisIndex == 6);
STATIC_ASSERT(PropertyCallbackArguments::kArgsLength == 7);
Register receiver = ApiGetterDescriptor::ReceiverRegister();
Register holder = ApiGetterDescriptor::HolderRegister();
Register callback = ApiGetterDescriptor::CallbackRegister();
Register scratch = r6;
DCHECK(!AreAliased(receiver, holder, callback, scratch));
Register api_function_address = r4;
__ push(receiver);
// Push data from AccessorInfo.
__ LoadP(scratch, FieldMemOperand(callback, AccessorInfo::kDataOffset));
__ push(scratch);
__ LoadRoot(scratch, Heap::kUndefinedValueRootIndex);
__ Push(scratch, scratch);
__ mov(scratch, Operand(ExternalReference::isolate_address(isolate())));
__ Push(scratch, holder);
__ Push(Smi::kZero); // should_throw_on_error -> false
__ LoadP(scratch, FieldMemOperand(callback, AccessorInfo::kNameOffset));
__ push(scratch);
// v8::PropertyCallbackInfo::args_ array and name handle.
const int kStackUnwindSpace = PropertyCallbackArguments::kArgsLength + 1;
// Load address of v8::PropertyAccessorInfo::args_ array and name handle.
__ LoadRR(r2, sp); // r2 = Handle<Name>
__ AddP(r3, r2, Operand(1 * kPointerSize)); // r3 = v8::PCI::args_
// If ABI passes Handles (pointer-sized struct) in a register:
//
// Create 2 extra slots on stack:
// [0] space for DirectCEntryStub's LR save
// [1] AccessorInfo&
//
// Otherwise:
//
// Create 3 extra slots on stack:
// [0] space for DirectCEntryStub's LR save
// [1] copy of Handle (first arg)
// [2] AccessorInfo&
if (ABI_PASSES_HANDLES_IN_REGS) {
accessorInfoSlot = kStackFrameExtraParamSlot + 1;
apiStackSpace = 2;
} else {
arg0Slot = kStackFrameExtraParamSlot + 1;
accessorInfoSlot = arg0Slot + 1;
apiStackSpace = 3;
}
FrameScope frame_scope(masm, StackFrame::MANUAL);
__ EnterExitFrame(false, apiStackSpace);
if (!ABI_PASSES_HANDLES_IN_REGS) {
// pass 1st arg by reference
__ StoreP(r2, MemOperand(sp, arg0Slot * kPointerSize));
__ AddP(r2, sp, Operand(arg0Slot * kPointerSize));
}
// Create v8::PropertyCallbackInfo object on the stack and initialize
// it's args_ field.
__ StoreP(r3, MemOperand(sp, accessorInfoSlot * kPointerSize));
__ AddP(r3, sp, Operand(accessorInfoSlot * kPointerSize));
// r3 = v8::PropertyCallbackInfo&
ExternalReference thunk_ref =
ExternalReference::invoke_accessor_getter_callback(isolate());
__ LoadP(scratch, FieldMemOperand(callback, AccessorInfo::kJsGetterOffset));
__ LoadP(api_function_address,
FieldMemOperand(scratch, Foreign::kForeignAddressOffset));
// +3 is to skip prolog, return address and name handle.
MemOperand return_value_operand(
fp, (PropertyCallbackArguments::kReturnValueOffset + 3) * kPointerSize);
CallApiFunctionAndReturn(masm, api_function_address, thunk_ref,
kStackUnwindSpace, NULL, return_value_operand, NULL);
}
#undef __
} // namespace internal
} // namespace v8
#endif // V8_TARGET_ARCH_S390