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v8/src/x64/code-stubs-x64.cc

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// Copyright 2013 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "v8.h"
#if V8_TARGET_ARCH_X64
#include "bootstrapper.h"
#include "code-stubs.h"
#include "regexp-macro-assembler.h"
#include "stub-cache.h"
#include "runtime.h"
namespace v8 {
namespace internal {
void FastNewClosureStub::InitializeInterfaceDescriptor(
Isolate* isolate,
CodeStubInterfaceDescriptor* descriptor) {
static Register registers[] = { rbx };
descriptor->register_param_count_ = 1;
descriptor->register_params_ = registers;
descriptor->deoptimization_handler_ =
Runtime::FunctionForId(Runtime::kNewClosureFromStubFailure)->entry;
}
void FastNewContextStub::InitializeInterfaceDescriptor(
Isolate* isolate,
CodeStubInterfaceDescriptor* descriptor) {
static Register registers[] = { rdi };
descriptor->register_param_count_ = 1;
descriptor->register_params_ = registers;
descriptor->deoptimization_handler_ = NULL;
}
void ToNumberStub::InitializeInterfaceDescriptor(
Isolate* isolate,
CodeStubInterfaceDescriptor* descriptor) {
static Register registers[] = { rax };
descriptor->register_param_count_ = 1;
descriptor->register_params_ = registers;
descriptor->deoptimization_handler_ = NULL;
}
void NumberToStringStub::InitializeInterfaceDescriptor(
Isolate* isolate,
CodeStubInterfaceDescriptor* descriptor) {
static Register registers[] = { rax };
descriptor->register_param_count_ = 1;
descriptor->register_params_ = registers;
descriptor->deoptimization_handler_ =
Runtime::FunctionForId(Runtime::kNumberToString)->entry;
}
void FastCloneShallowArrayStub::InitializeInterfaceDescriptor(
Isolate* isolate,
CodeStubInterfaceDescriptor* descriptor) {
static Register registers[] = { rax, rbx, rcx };
descriptor->register_param_count_ = 3;
descriptor->register_params_ = registers;
descriptor->deoptimization_handler_ =
Runtime::FunctionForId(Runtime::kCreateArrayLiteralStubBailout)->entry;
}
void FastCloneShallowObjectStub::InitializeInterfaceDescriptor(
Isolate* isolate,
CodeStubInterfaceDescriptor* descriptor) {
static Register registers[] = { rax, rbx, rcx, rdx };
descriptor->register_param_count_ = 4;
descriptor->register_params_ = registers;
descriptor->deoptimization_handler_ =
Runtime::FunctionForId(Runtime::kCreateObjectLiteral)->entry;
}
void CreateAllocationSiteStub::InitializeInterfaceDescriptor(
Isolate* isolate,
CodeStubInterfaceDescriptor* descriptor) {
static Register registers[] = { rbx, rdx };
descriptor->register_param_count_ = 2;
descriptor->register_params_ = registers;
descriptor->deoptimization_handler_ = NULL;
}
void KeyedLoadFastElementStub::InitializeInterfaceDescriptor(
Isolate* isolate,
CodeStubInterfaceDescriptor* descriptor) {
static Register registers[] = { rdx, rax };
descriptor->register_param_count_ = 2;
descriptor->register_params_ = registers;
descriptor->deoptimization_handler_ =
FUNCTION_ADDR(KeyedLoadIC_MissFromStubFailure);
}
void KeyedLoadDictionaryElementStub::InitializeInterfaceDescriptor(
Isolate* isolate,
CodeStubInterfaceDescriptor* descriptor) {
static Register registers[] = { rdx, rax };
descriptor->register_param_count_ = 2;
descriptor->register_params_ = registers;
descriptor->deoptimization_handler_ =
FUNCTION_ADDR(KeyedLoadIC_MissFromStubFailure);
}
void RegExpConstructResultStub::InitializeInterfaceDescriptor(
Isolate* isolate,
CodeStubInterfaceDescriptor* descriptor) {
static Register registers[] = { rcx, rbx, rax };
descriptor->register_param_count_ = 3;
descriptor->register_params_ = registers;
descriptor->deoptimization_handler_ =
Runtime::FunctionForId(Runtime::kRegExpConstructResult)->entry;
}
void LoadFieldStub::InitializeInterfaceDescriptor(
Isolate* isolate,
CodeStubInterfaceDescriptor* descriptor) {
static Register registers[] = { rax };
descriptor->register_param_count_ = 1;
descriptor->register_params_ = registers;
descriptor->deoptimization_handler_ = NULL;
}
void KeyedLoadFieldStub::InitializeInterfaceDescriptor(
Isolate* isolate,
CodeStubInterfaceDescriptor* descriptor) {
static Register registers[] = { rdx };
descriptor->register_param_count_ = 1;
descriptor->register_params_ = registers;
descriptor->deoptimization_handler_ = NULL;
}
void KeyedStoreFastElementStub::InitializeInterfaceDescriptor(
Isolate* isolate,
CodeStubInterfaceDescriptor* descriptor) {
static Register registers[] = { rdx, rcx, rax };
descriptor->register_param_count_ = 3;
descriptor->register_params_ = registers;
descriptor->deoptimization_handler_ =
FUNCTION_ADDR(KeyedStoreIC_MissFromStubFailure);
}
void TransitionElementsKindStub::InitializeInterfaceDescriptor(
Isolate* isolate,
CodeStubInterfaceDescriptor* descriptor) {
static Register registers[] = { rax, rbx };
descriptor->register_param_count_ = 2;
descriptor->register_params_ = registers;
descriptor->deoptimization_handler_ =
Runtime::FunctionForId(Runtime::kTransitionElementsKind)->entry;
}
static void InitializeArrayConstructorDescriptor(
Isolate* isolate,
CodeStubInterfaceDescriptor* descriptor,
int constant_stack_parameter_count) {
// register state
// rax -- number of arguments
// rdi -- function
// rbx -- allocation site with elements kind
static Register registers_variable_args[] = { rdi, rbx, rax };
static Register registers_no_args[] = { rdi, rbx };
if (constant_stack_parameter_count == 0) {
descriptor->register_param_count_ = 2;
descriptor->register_params_ = registers_no_args;
} else {
// stack param count needs (constructor pointer, and single argument)
descriptor->handler_arguments_mode_ = PASS_ARGUMENTS;
descriptor->stack_parameter_count_ = rax;
descriptor->register_param_count_ = 3;
descriptor->register_params_ = registers_variable_args;
}
descriptor->hint_stack_parameter_count_ = constant_stack_parameter_count;
descriptor->function_mode_ = JS_FUNCTION_STUB_MODE;
descriptor->deoptimization_handler_ =
Runtime::FunctionForId(Runtime::kArrayConstructor)->entry;
}
static void InitializeInternalArrayConstructorDescriptor(
Isolate* isolate,
CodeStubInterfaceDescriptor* descriptor,
int constant_stack_parameter_count) {
// register state
// rax -- number of arguments
// rdi -- constructor function
static Register registers_variable_args[] = { rdi, rax };
static Register registers_no_args[] = { rdi };
if (constant_stack_parameter_count == 0) {
descriptor->register_param_count_ = 1;
descriptor->register_params_ = registers_no_args;
} else {
// stack param count needs (constructor pointer, and single argument)
descriptor->handler_arguments_mode_ = PASS_ARGUMENTS;
descriptor->stack_parameter_count_ = rax;
descriptor->register_param_count_ = 2;
descriptor->register_params_ = registers_variable_args;
}
descriptor->hint_stack_parameter_count_ = constant_stack_parameter_count;
descriptor->function_mode_ = JS_FUNCTION_STUB_MODE;
descriptor->deoptimization_handler_ =
Runtime::FunctionForId(Runtime::kInternalArrayConstructor)->entry;
}
void ArrayNoArgumentConstructorStub::InitializeInterfaceDescriptor(
Isolate* isolate,
CodeStubInterfaceDescriptor* descriptor) {
InitializeArrayConstructorDescriptor(isolate, descriptor, 0);
}
void ArraySingleArgumentConstructorStub::InitializeInterfaceDescriptor(
Isolate* isolate,
CodeStubInterfaceDescriptor* descriptor) {
InitializeArrayConstructorDescriptor(isolate, descriptor, 1);
}
void ArrayNArgumentsConstructorStub::InitializeInterfaceDescriptor(
Isolate* isolate,
CodeStubInterfaceDescriptor* descriptor) {
InitializeArrayConstructorDescriptor(isolate, descriptor, -1);
}
void InternalArrayNoArgumentConstructorStub::InitializeInterfaceDescriptor(
Isolate* isolate,
CodeStubInterfaceDescriptor* descriptor) {
InitializeInternalArrayConstructorDescriptor(isolate, descriptor, 0);
}
void InternalArraySingleArgumentConstructorStub::InitializeInterfaceDescriptor(
Isolate* isolate,
CodeStubInterfaceDescriptor* descriptor) {
InitializeInternalArrayConstructorDescriptor(isolate, descriptor, 1);
}
void InternalArrayNArgumentsConstructorStub::InitializeInterfaceDescriptor(
Isolate* isolate,
CodeStubInterfaceDescriptor* descriptor) {
InitializeInternalArrayConstructorDescriptor(isolate, descriptor, -1);
}
void CompareNilICStub::InitializeInterfaceDescriptor(
Isolate* isolate,
CodeStubInterfaceDescriptor* descriptor) {
static Register registers[] = { rax };
descriptor->register_param_count_ = 1;
descriptor->register_params_ = registers;
descriptor->deoptimization_handler_ =
FUNCTION_ADDR(CompareNilIC_Miss);
descriptor->SetMissHandler(
ExternalReference(IC_Utility(IC::kCompareNilIC_Miss), isolate));
}
void ToBooleanStub::InitializeInterfaceDescriptor(
Isolate* isolate,
CodeStubInterfaceDescriptor* descriptor) {
static Register registers[] = { rax };
descriptor->register_param_count_ = 1;
descriptor->register_params_ = registers;
descriptor->deoptimization_handler_ =
FUNCTION_ADDR(ToBooleanIC_Miss);
descriptor->SetMissHandler(
ExternalReference(IC_Utility(IC::kToBooleanIC_Miss), isolate));
}
void StoreGlobalStub::InitializeInterfaceDescriptor(
Isolate* isolate,
CodeStubInterfaceDescriptor* descriptor) {
static Register registers[] = { rdx, rcx, rax };
descriptor->register_param_count_ = 3;
descriptor->register_params_ = registers;
descriptor->deoptimization_handler_ =
FUNCTION_ADDR(StoreIC_MissFromStubFailure);
}
void ElementsTransitionAndStoreStub::InitializeInterfaceDescriptor(
Isolate* isolate,
CodeStubInterfaceDescriptor* descriptor) {
static Register registers[] = { rax, rbx, rcx, rdx };
descriptor->register_param_count_ = 4;
descriptor->register_params_ = registers;
descriptor->deoptimization_handler_ =
FUNCTION_ADDR(ElementsTransitionAndStoreIC_Miss);
}
void BinaryOpICStub::InitializeInterfaceDescriptor(
Isolate* isolate,
CodeStubInterfaceDescriptor* descriptor) {
static Register registers[] = { rdx, rax };
descriptor->register_param_count_ = 2;
descriptor->register_params_ = registers;
descriptor->deoptimization_handler_ = FUNCTION_ADDR(BinaryOpIC_Miss);
descriptor->SetMissHandler(
ExternalReference(IC_Utility(IC::kBinaryOpIC_Miss), isolate));
}
void BinaryOpWithAllocationSiteStub::InitializeInterfaceDescriptor(
Isolate* isolate,
CodeStubInterfaceDescriptor* descriptor) {
static Register registers[] = { rcx, rdx, rax };
descriptor->register_param_count_ = 3;
descriptor->register_params_ = registers;
descriptor->deoptimization_handler_ =
FUNCTION_ADDR(BinaryOpIC_MissWithAllocationSite);
}
void StringAddStub::InitializeInterfaceDescriptor(
Isolate* isolate,
CodeStubInterfaceDescriptor* descriptor) {
static Register registers[] = { rdx, rax };
descriptor->register_param_count_ = 2;
descriptor->register_params_ = registers;
descriptor->deoptimization_handler_ =
Runtime::FunctionForId(Runtime::kStringAdd)->entry;
}
void CallDescriptors::InitializeForIsolate(Isolate* isolate) {
{
CallInterfaceDescriptor* descriptor =
isolate->call_descriptor(Isolate::ArgumentAdaptorCall);
static Register registers[] = { rdi, // JSFunction
rsi, // context
rax, // actual number of arguments
rbx, // expected number of arguments
};
static Representation representations[] = {
Representation::Tagged(), // JSFunction
Representation::Tagged(), // context
Representation::Integer32(), // actual number of arguments
Representation::Integer32(), // expected number of arguments
};
descriptor->register_param_count_ = 4;
descriptor->register_params_ = registers;
descriptor->param_representations_ = representations;
}
{
CallInterfaceDescriptor* descriptor =
isolate->call_descriptor(Isolate::KeyedCall);
static Register registers[] = { rsi, // context
rcx, // key
};
static Representation representations[] = {
Representation::Tagged(), // context
Representation::Tagged(), // key
};
descriptor->register_param_count_ = 2;
descriptor->register_params_ = registers;
descriptor->param_representations_ = representations;
}
{
CallInterfaceDescriptor* descriptor =
isolate->call_descriptor(Isolate::NamedCall);
static Register registers[] = { rsi, // context
rcx, // name
};
static Representation representations[] = {
Representation::Tagged(), // context
Representation::Tagged(), // name
};
descriptor->register_param_count_ = 2;
descriptor->register_params_ = registers;
descriptor->param_representations_ = representations;
}
{
CallInterfaceDescriptor* descriptor =
isolate->call_descriptor(Isolate::CallHandler);
static Register registers[] = { rsi, // context
rdx, // receiver
};
static Representation representations[] = {
Representation::Tagged(), // context
Representation::Tagged(), // receiver
};
descriptor->register_param_count_ = 2;
descriptor->register_params_ = registers;
descriptor->param_representations_ = representations;
}
{
CallInterfaceDescriptor* descriptor =
isolate->call_descriptor(Isolate::ApiFunctionCall);
static Register registers[] = { rax, // callee
rbx, // call_data
rcx, // holder
rdx, // api_function_address
rsi, // context
};
static Representation representations[] = {
Representation::Tagged(), // callee
Representation::Tagged(), // call_data
Representation::Tagged(), // holder
Representation::External(), // api_function_address
Representation::Tagged(), // context
};
descriptor->register_param_count_ = 5;
descriptor->register_params_ = registers;
descriptor->param_representations_ = representations;
}
}
#define __ ACCESS_MASM(masm)
void HydrogenCodeStub::GenerateLightweightMiss(MacroAssembler* masm) {
// Update the static counter each time a new code stub is generated.
Isolate* isolate = masm->isolate();
isolate->counters()->code_stubs()->Increment();
CodeStubInterfaceDescriptor* descriptor = GetInterfaceDescriptor(isolate);
int param_count = descriptor->register_param_count_;
{
// Call the runtime system in a fresh internal frame.
FrameScope scope(masm, StackFrame::INTERNAL);
ASSERT(descriptor->register_param_count_ == 0 ||
rax.is(descriptor->register_params_[param_count - 1]));
// Push arguments
for (int i = 0; i < param_count; ++i) {
__ push(descriptor->register_params_[i]);
}
ExternalReference miss = descriptor->miss_handler();
__ CallExternalReference(miss, descriptor->register_param_count_);
}
__ Ret();
}
void StoreBufferOverflowStub::Generate(MacroAssembler* masm) {
__ PushCallerSaved(save_doubles_);
const int argument_count = 1;
__ PrepareCallCFunction(argument_count);
__ LoadAddress(arg_reg_1,
ExternalReference::isolate_address(masm->isolate()));
AllowExternalCallThatCantCauseGC scope(masm);
__ CallCFunction(
ExternalReference::store_buffer_overflow_function(masm->isolate()),
argument_count);
__ PopCallerSaved(save_doubles_);
__ ret(0);
}
class FloatingPointHelper : public AllStatic {
public:
enum ConvertUndefined {
CONVERT_UNDEFINED_TO_ZERO,
BAILOUT_ON_UNDEFINED
};
// Load the operands from rdx and rax into xmm0 and xmm1, as doubles.
// If the operands are not both numbers, jump to not_numbers.
// Leaves rdx and rax unchanged. SmiOperands assumes both are smis.
// NumberOperands assumes both are smis or heap numbers.
static void LoadSSE2UnknownOperands(MacroAssembler* masm,
Label* not_numbers);
};
void DoubleToIStub::Generate(MacroAssembler* masm) {
Register input_reg = this->source();
Register final_result_reg = this->destination();
ASSERT(is_truncating());
Label check_negative, process_64_bits, done;
int double_offset = offset();
// Account for return address and saved regs if input is rsp.
if (input_reg.is(rsp)) double_offset += 3 * kPointerSize;
MemOperand mantissa_operand(MemOperand(input_reg, double_offset));
MemOperand exponent_operand(MemOperand(input_reg,
double_offset + kDoubleSize / 2));
Register scratch1;
Register scratch_candidates[3] = { rbx, rdx, rdi };
for (int i = 0; i < 3; i++) {
scratch1 = scratch_candidates[i];
if (!final_result_reg.is(scratch1) && !input_reg.is(scratch1)) break;
}
// Since we must use rcx for shifts below, use some other register (rax)
// to calculate the result if ecx is the requested return register.
Register result_reg = final_result_reg.is(rcx) ? rax : final_result_reg;
// Save ecx if it isn't the return register and therefore volatile, or if it
// is the return register, then save the temp register we use in its stead
// for the result.
Register save_reg = final_result_reg.is(rcx) ? rax : rcx;
__ push(scratch1);
__ push(save_reg);
bool stash_exponent_copy = !input_reg.is(rsp);
__ movl(scratch1, mantissa_operand);
__ movsd(xmm0, mantissa_operand);
__ movl(rcx, exponent_operand);
if (stash_exponent_copy) __ push(rcx);
__ andl(rcx, Immediate(HeapNumber::kExponentMask));
__ shrl(rcx, Immediate(HeapNumber::kExponentShift));
__ leal(result_reg, MemOperand(rcx, -HeapNumber::kExponentBias));
__ cmpl(result_reg, Immediate(HeapNumber::kMantissaBits));
__ j(below, &process_64_bits);
// Result is entirely in lower 32-bits of mantissa
int delta = HeapNumber::kExponentBias + Double::kPhysicalSignificandSize;
__ subl(rcx, Immediate(delta));
__ xorl(result_reg, result_reg);
__ cmpl(rcx, Immediate(31));
__ j(above, &done);
__ shll_cl(scratch1);
__ jmp(&check_negative);
__ bind(&process_64_bits);
__ cvttsd2siq(result_reg, xmm0);
__ jmp(&done, Label::kNear);
// If the double was negative, negate the integer result.
__ bind(&check_negative);
__ movl(result_reg, scratch1);
__ negl(result_reg);
if (stash_exponent_copy) {
__ cmpl(MemOperand(rsp, 0), Immediate(0));
} else {
__ cmpl(exponent_operand, Immediate(0));
}
__ cmovl(greater, result_reg, scratch1);
// Restore registers
__ bind(&done);
if (stash_exponent_copy) {
__ addq(rsp, Immediate(kDoubleSize));
}
if (!final_result_reg.is(result_reg)) {
ASSERT(final_result_reg.is(rcx));
__ movl(final_result_reg, result_reg);
}
__ pop(save_reg);
__ pop(scratch1);
__ ret(0);
}
void FloatingPointHelper::LoadSSE2UnknownOperands(MacroAssembler* masm,
Label* not_numbers) {
Label load_smi_rdx, load_nonsmi_rax, load_smi_rax, load_float_rax, done;
// Load operand in rdx into xmm0, or branch to not_numbers.
__ LoadRoot(rcx, Heap::kHeapNumberMapRootIndex);
__ JumpIfSmi(rdx, &load_smi_rdx);
__ cmpq(FieldOperand(rdx, HeapObject::kMapOffset), rcx);
__ j(not_equal, not_numbers); // Argument in rdx is not a number.
__ movsd(xmm0, FieldOperand(rdx, HeapNumber::kValueOffset));
// Load operand in rax into xmm1, or branch to not_numbers.
__ JumpIfSmi(rax, &load_smi_rax);
__ bind(&load_nonsmi_rax);
__ cmpq(FieldOperand(rax, HeapObject::kMapOffset), rcx);
__ j(not_equal, not_numbers);
__ movsd(xmm1, FieldOperand(rax, HeapNumber::kValueOffset));
__ jmp(&done);
__ bind(&load_smi_rdx);
__ SmiToInteger32(kScratchRegister, rdx);
__ Cvtlsi2sd(xmm0, kScratchRegister);
__ JumpIfNotSmi(rax, &load_nonsmi_rax);
__ bind(&load_smi_rax);
__ SmiToInteger32(kScratchRegister, rax);
__ Cvtlsi2sd(xmm1, kScratchRegister);
__ bind(&done);
}
void MathPowStub::Generate(MacroAssembler* masm) {
const Register exponent = rdx;
const Register base = rax;
const Register scratch = rcx;
const XMMRegister double_result = xmm3;
const XMMRegister double_base = xmm2;
const XMMRegister double_exponent = xmm1;
const XMMRegister double_scratch = xmm4;
Label call_runtime, done, exponent_not_smi, int_exponent;
// Save 1 in double_result - we need this several times later on.
__ movp(scratch, Immediate(1));
__ Cvtlsi2sd(double_result, scratch);
if (exponent_type_ == ON_STACK) {
Label base_is_smi, unpack_exponent;
// The exponent and base are supplied as arguments on the stack.
// This can only happen if the stub is called from non-optimized code.
// Load input parameters from stack.
StackArgumentsAccessor args(rsp, 2, ARGUMENTS_DONT_CONTAIN_RECEIVER);
__ movp(base, args.GetArgumentOperand(0));
__ movp(exponent, args.GetArgumentOperand(1));
__ JumpIfSmi(base, &base_is_smi, Label::kNear);
__ CompareRoot(FieldOperand(base, HeapObject::kMapOffset),
Heap::kHeapNumberMapRootIndex);
__ j(not_equal, &call_runtime);
__ movsd(double_base, FieldOperand(base, HeapNumber::kValueOffset));
__ jmp(&unpack_exponent, Label::kNear);
__ bind(&base_is_smi);
__ SmiToInteger32(base, base);
__ Cvtlsi2sd(double_base, base);
__ bind(&unpack_exponent);
__ JumpIfNotSmi(exponent, &exponent_not_smi, Label::kNear);
__ SmiToInteger32(exponent, exponent);
__ jmp(&int_exponent);
__ bind(&exponent_not_smi);
__ CompareRoot(FieldOperand(exponent, HeapObject::kMapOffset),
Heap::kHeapNumberMapRootIndex);
__ j(not_equal, &call_runtime);
__ movsd(double_exponent, FieldOperand(exponent, HeapNumber::kValueOffset));
} else if (exponent_type_ == TAGGED) {
__ JumpIfNotSmi(exponent, &exponent_not_smi, Label::kNear);
__ SmiToInteger32(exponent, exponent);
__ jmp(&int_exponent);
__ bind(&exponent_not_smi);
__ movsd(double_exponent, FieldOperand(exponent, HeapNumber::kValueOffset));
}
if (exponent_type_ != INTEGER) {
Label fast_power, try_arithmetic_simplification;
// Detect integer exponents stored as double.
__ DoubleToI(exponent, double_exponent, double_scratch,
TREAT_MINUS_ZERO_AS_ZERO, &try_arithmetic_simplification);
__ jmp(&int_exponent);
__ bind(&try_arithmetic_simplification);
__ cvttsd2si(exponent, double_exponent);
// Skip to runtime if possibly NaN (indicated by the indefinite integer).
__ cmpl(exponent, Immediate(0x80000000u));
__ j(equal, &call_runtime);
if (exponent_type_ == ON_STACK) {
// Detect square root case. Crankshaft detects constant +/-0.5 at
// compile time and uses DoMathPowHalf instead. We then skip this check
// for non-constant cases of +/-0.5 as these hardly occur.
Label continue_sqrt, continue_rsqrt, not_plus_half;
// Test for 0.5.
// Load double_scratch with 0.5.
__ movq(scratch, V8_UINT64_C(0x3FE0000000000000));
__ movq(double_scratch, scratch);
// Already ruled out NaNs for exponent.
__ ucomisd(double_scratch, double_exponent);
__ j(not_equal, &not_plus_half, Label::kNear);
// Calculates square root of base. Check for the special case of
// Math.pow(-Infinity, 0.5) == Infinity (ECMA spec, 15.8.2.13).
// According to IEEE-754, double-precision -Infinity has the highest
// 12 bits set and the lowest 52 bits cleared.
__ movq(scratch, V8_UINT64_C(0xFFF0000000000000));
__ movq(double_scratch, scratch);
__ ucomisd(double_scratch, double_base);
// Comparing -Infinity with NaN results in "unordered", which sets the
// zero flag as if both were equal. However, it also sets the carry flag.
__ j(not_equal, &continue_sqrt, Label::kNear);
__ j(carry, &continue_sqrt, Label::kNear);
// Set result to Infinity in the special case.
__ xorps(double_result, double_result);
__ subsd(double_result, double_scratch);
__ jmp(&done);
__ bind(&continue_sqrt);
// sqrtsd returns -0 when input is -0. ECMA spec requires +0.
__ xorps(double_scratch, double_scratch);
__ addsd(double_scratch, double_base); // Convert -0 to 0.
__ sqrtsd(double_result, double_scratch);
__ jmp(&done);
// Test for -0.5.
__ bind(&not_plus_half);
// Load double_scratch with -0.5 by substracting 1.
__ subsd(double_scratch, double_result);
// Already ruled out NaNs for exponent.
__ ucomisd(double_scratch, double_exponent);
__ j(not_equal, &fast_power, Label::kNear);
// Calculates reciprocal of square root of base. Check for the special
// case of Math.pow(-Infinity, -0.5) == 0 (ECMA spec, 15.8.2.13).
// According to IEEE-754, double-precision -Infinity has the highest
// 12 bits set and the lowest 52 bits cleared.
__ movq(scratch, V8_UINT64_C(0xFFF0000000000000));
__ movq(double_scratch, scratch);
__ ucomisd(double_scratch, double_base);
// Comparing -Infinity with NaN results in "unordered", which sets the
// zero flag as if both were equal. However, it also sets the carry flag.
__ j(not_equal, &continue_rsqrt, Label::kNear);
__ j(carry, &continue_rsqrt, Label::kNear);
// Set result to 0 in the special case.
__ xorps(double_result, double_result);
__ jmp(&done);
__ bind(&continue_rsqrt);
// sqrtsd returns -0 when input is -0. ECMA spec requires +0.
__ xorps(double_exponent, double_exponent);
__ addsd(double_exponent, double_base); // Convert -0 to +0.
__ sqrtsd(double_exponent, double_exponent);
__ divsd(double_result, double_exponent);
__ jmp(&done);
}
// Using FPU instructions to calculate power.
Label fast_power_failed;
__ bind(&fast_power);
__ fnclex(); // Clear flags to catch exceptions later.
// Transfer (B)ase and (E)xponent onto the FPU register stack.
__ subq(rsp, Immediate(kDoubleSize));
__ movsd(Operand(rsp, 0), double_exponent);
__ fld_d(Operand(rsp, 0)); // E
__ movsd(Operand(rsp, 0), double_base);
__ fld_d(Operand(rsp, 0)); // B, E
// Exponent is in st(1) and base is in st(0)
// B ^ E = (2^(E * log2(B)) - 1) + 1 = (2^X - 1) + 1 for X = E * log2(B)
// FYL2X calculates st(1) * log2(st(0))
__ fyl2x(); // X
__ fld(0); // X, X
__ frndint(); // rnd(X), X
__ fsub(1); // rnd(X), X-rnd(X)
__ fxch(1); // X - rnd(X), rnd(X)
// F2XM1 calculates 2^st(0) - 1 for -1 < st(0) < 1
__ f2xm1(); // 2^(X-rnd(X)) - 1, rnd(X)
__ fld1(); // 1, 2^(X-rnd(X)) - 1, rnd(X)
__ faddp(1); // 2^(X-rnd(X)), rnd(X)
// FSCALE calculates st(0) * 2^st(1)
__ fscale(); // 2^X, rnd(X)
__ fstp(1);
// Bail out to runtime in case of exceptions in the status word.
__ fnstsw_ax();
__ testb(rax, Immediate(0x5F)); // Check for all but precision exception.
__ j(not_zero, &fast_power_failed, Label::kNear);
__ fstp_d(Operand(rsp, 0));
__ movsd(double_result, Operand(rsp, 0));
__ addq(rsp, Immediate(kDoubleSize));
__ jmp(&done);
__ bind(&fast_power_failed);
__ fninit();
__ addq(rsp, Immediate(kDoubleSize));
__ jmp(&call_runtime);
}
// Calculate power with integer exponent.
__ bind(&int_exponent);
const XMMRegister double_scratch2 = double_exponent;
// Back up exponent as we need to check if exponent is negative later.
__ movp(scratch, exponent); // Back up exponent.
__ movsd(double_scratch, double_base); // Back up base.
__ movsd(double_scratch2, double_result); // Load double_exponent with 1.
// Get absolute value of exponent.
Label no_neg, while_true, while_false;
__ testl(scratch, scratch);
__ j(positive, &no_neg, Label::kNear);
__ negl(scratch);
__ bind(&no_neg);
__ j(zero, &while_false, Label::kNear);
__ shrl(scratch, Immediate(1));
// Above condition means CF==0 && ZF==0. This means that the
// bit that has been shifted out is 0 and the result is not 0.
__ j(above, &while_true, Label::kNear);
__ movsd(double_result, double_scratch);
__ j(zero, &while_false, Label::kNear);
__ bind(&while_true);
__ shrl(scratch, Immediate(1));
__ mulsd(double_scratch, double_scratch);
__ j(above, &while_true, Label::kNear);
__ mulsd(double_result, double_scratch);
__ j(not_zero, &while_true);
__ bind(&while_false);
// If the exponent is negative, return 1/result.
__ testl(exponent, exponent);
__ j(greater, &done);
__ divsd(double_scratch2, double_result);
__ movsd(double_result, double_scratch2);
// 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.
__ xorps(double_scratch2, double_scratch2);
__ ucomisd(double_scratch2, double_result);
// double_exponent aliased as double_scratch2 has already been overwritten
// and may not have contained the exponent value in the first place when the
// input was a smi. We reset it with exponent value before bailing out.
__ j(not_equal, &done);
__ Cvtlsi2sd(double_exponent, exponent);
// Returning or bailing out.
Counters* counters = masm->isolate()->counters();
if (exponent_type_ == ON_STACK) {
// The arguments are still on the stack.
__ bind(&call_runtime);
__ TailCallRuntime(Runtime::kMath_pow_cfunction, 2, 1);
// The stub is called from non-optimized code, which expects the result
// as heap number in rax.
__ bind(&done);
__ AllocateHeapNumber(rax, rcx, &call_runtime);
__ movsd(FieldOperand(rax, HeapNumber::kValueOffset), double_result);
__ IncrementCounter(counters->math_pow(), 1);
__ ret(2 * kPointerSize);
} else {
__ bind(&call_runtime);
// Move base to the correct argument register. Exponent is already in xmm1.
__ movsd(xmm0, double_base);
ASSERT(double_exponent.is(xmm1));
{
AllowExternalCallThatCantCauseGC scope(masm);
__ PrepareCallCFunction(2);
__ CallCFunction(
ExternalReference::power_double_double_function(masm->isolate()), 2);
}
// Return value is in xmm0.
__ movsd(double_result, xmm0);
__ bind(&done);
__ IncrementCounter(counters->math_pow(), 1);
__ ret(0);
}
}
void FunctionPrototypeStub::Generate(MacroAssembler* masm) {
Label miss;
Register receiver;
if (kind() == Code::KEYED_LOAD_IC) {
// ----------- S t a t e -------------
// -- rax : key
// -- rdx : receiver
// -- rsp[0] : return address
// -----------------------------------
__ Cmp(rax, masm->isolate()->factory()->prototype_string());
__ j(not_equal, &miss);
receiver = rdx;
} else {
ASSERT(kind() == Code::LOAD_IC);
// ----------- S t a t e -------------
// -- rax : receiver
// -- rcx : name
// -- rsp[0] : return address
// -----------------------------------
receiver = rax;
}
StubCompiler::GenerateLoadFunctionPrototype(masm, receiver, r8, r9, &miss);
__ bind(&miss);
StubCompiler::TailCallBuiltin(
masm, BaseLoadStoreStubCompiler::MissBuiltin(kind()));
}
void StringLengthStub::Generate(MacroAssembler* masm) {
Label miss;
Register receiver;
if (kind() == Code::KEYED_LOAD_IC) {
// ----------- S t a t e -------------
// -- rax : key
// -- rdx : receiver
// -- rsp[0] : return address
// -----------------------------------
__ Cmp(rax, masm->isolate()->factory()->length_string());
__ j(not_equal, &miss);
receiver = rdx;
} else {
ASSERT(kind() == Code::LOAD_IC);
// ----------- S t a t e -------------
// -- rax : receiver
// -- rcx : name
// -- rsp[0] : return address
// -----------------------------------
receiver = rax;
}
StubCompiler::GenerateLoadStringLength(masm, receiver, r8, r9, &miss);
__ bind(&miss);
StubCompiler::TailCallBuiltin(
masm, BaseLoadStoreStubCompiler::MissBuiltin(kind()));
}
void StoreArrayLengthStub::Generate(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- rax : value
// -- rcx : key
// -- rdx : receiver
// -- rsp[0] : return address
// -----------------------------------
//
// This accepts as a receiver anything JSArray::SetElementsLength accepts
// (currently anything except for external arrays which means anything with
// elements of FixedArray type). Value must be a number, but only smis are
// accepted as the most common case.
Label miss;
Register receiver = rdx;
Register value = rax;
Register scratch = rbx;
if (kind() == Code::KEYED_STORE_IC) {
__ Cmp(rcx, masm->isolate()->factory()->length_string());
__ j(not_equal, &miss);
}
// Check that the receiver isn't a smi.
__ JumpIfSmi(receiver, &miss);
// Check that the object is a JS array.
__ CmpObjectType(receiver, JS_ARRAY_TYPE, scratch);
__ j(not_equal, &miss);
// Check that elements are FixedArray.
// We rely on StoreIC_ArrayLength below to deal with all types of
// fast elements (including COW).
__ movp(scratch, FieldOperand(receiver, JSArray::kElementsOffset));
__ CmpObjectType(scratch, FIXED_ARRAY_TYPE, scratch);
__ j(not_equal, &miss);
// Check that the array has fast properties, otherwise the length
// property might have been redefined.
__ movp(scratch, FieldOperand(receiver, JSArray::kPropertiesOffset));
__ CompareRoot(FieldOperand(scratch, FixedArray::kMapOffset),
Heap::kHashTableMapRootIndex);
__ j(equal, &miss);
// Check that value is a smi.
__ JumpIfNotSmi(value, &miss);
// Prepare tail call to StoreIC_ArrayLength.
__ PopReturnAddressTo(scratch);
__ push(receiver);
__ push(value);
__ PushReturnAddressFrom(scratch);
ExternalReference ref =
ExternalReference(IC_Utility(IC::kStoreIC_ArrayLength), masm->isolate());
__ TailCallExternalReference(ref, 2, 1);
__ bind(&miss);
StubCompiler::TailCallBuiltin(
masm, BaseLoadStoreStubCompiler::MissBuiltin(kind()));
}
void ArgumentsAccessStub::GenerateReadElement(MacroAssembler* masm) {
// The key is in rdx and the parameter count is in rax.
// Check that the key is a smi.
Label slow;
__ JumpIfNotSmi(rdx, &slow);
// Check if the calling frame is an arguments adaptor frame. We look at the
// context offset, and if the frame is not a regular one, then we find a
// Smi instead of the context. We can't use SmiCompare here, because that
// only works for comparing two smis.
Label adaptor;
__ movp(rbx, Operand(rbp, StandardFrameConstants::kCallerFPOffset));
__ Cmp(Operand(rbx, StandardFrameConstants::kContextOffset),
Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR));
__ j(equal, &adaptor);
// Check index against formal parameters count limit passed in
// through register rax. Use unsigned comparison to get negative
// check for free.
__ cmpq(rdx, rax);
__ j(above_equal, &slow);
// Read the argument from the stack and return it.
__ SmiSub(rax, rax, rdx);
__ SmiToInteger32(rax, rax);
StackArgumentsAccessor args(rbp, rax, ARGUMENTS_DONT_CONTAIN_RECEIVER);
__ movp(rax, args.GetArgumentOperand(0));
__ Ret();
// Arguments adaptor case: Check index against actual arguments
// limit found in the arguments adaptor frame. Use unsigned
// comparison to get negative check for free.
__ bind(&adaptor);
__ movp(rcx, Operand(rbx, ArgumentsAdaptorFrameConstants::kLengthOffset));
__ cmpq(rdx, rcx);
__ j(above_equal, &slow);
// Read the argument from the stack and return it.
__ SmiSub(rcx, rcx, rdx);
__ SmiToInteger32(rcx, rcx);
StackArgumentsAccessor adaptor_args(rbx, rcx,
ARGUMENTS_DONT_CONTAIN_RECEIVER);
__ movp(rax, adaptor_args.GetArgumentOperand(0));
__ Ret();
// Slow-case: Handle non-smi or out-of-bounds access to arguments
// by calling the runtime system.
__ bind(&slow);
__ PopReturnAddressTo(rbx);
__ push(rdx);
__ PushReturnAddressFrom(rbx);
__ TailCallRuntime(Runtime::kGetArgumentsProperty, 1, 1);
}
void ArgumentsAccessStub::GenerateNewNonStrictFast(MacroAssembler* masm) {
// Stack layout:
// rsp[0] : return address
// rsp[8] : number of parameters (tagged)
// rsp[16] : receiver displacement
// rsp[24] : function
// Registers used over the whole function:
// rbx: the mapped parameter count (untagged)
// rax: the allocated object (tagged).
Factory* factory = masm->isolate()->factory();
StackArgumentsAccessor args(rsp, 3, ARGUMENTS_DONT_CONTAIN_RECEIVER);
__ SmiToInteger64(rbx, args.GetArgumentOperand(2));
// rbx = parameter count (untagged)
// Check if the calling frame is an arguments adaptor frame.
Label runtime;
Label adaptor_frame, try_allocate;
__ movp(rdx, Operand(rbp, StandardFrameConstants::kCallerFPOffset));
__ movp(rcx, Operand(rdx, StandardFrameConstants::kContextOffset));
__ Cmp(rcx, Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR));
__ j(equal, &adaptor_frame);
// No adaptor, parameter count = argument count.
__ movp(rcx, rbx);
__ jmp(&try_allocate, Label::kNear);
// We have an adaptor frame. Patch the parameters pointer.
__ bind(&adaptor_frame);
__ SmiToInteger64(rcx,
Operand(rdx,
ArgumentsAdaptorFrameConstants::kLengthOffset));
__ lea(rdx, Operand(rdx, rcx, times_pointer_size,
StandardFrameConstants::kCallerSPOffset));
__ movp(args.GetArgumentOperand(1), rdx);
// rbx = parameter count (untagged)
// rcx = argument count (untagged)
// Compute the mapped parameter count = min(rbx, rcx) in rbx.
__ cmpq(rbx, rcx);
__ j(less_equal, &try_allocate, Label::kNear);
__ movp(rbx, rcx);
__ 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;
Label no_parameter_map;
__ xor_(r8, r8);
__ testq(rbx, rbx);
__ j(zero, &no_parameter_map, Label::kNear);
__ lea(r8, Operand(rbx, times_pointer_size, kParameterMapHeaderSize));
__ bind(&no_parameter_map);
// 2. Backing store.
__ lea(r8, Operand(r8, rcx, times_pointer_size, FixedArray::kHeaderSize));
// 3. Arguments object.
__ addq(r8, Immediate(Heap::kArgumentsObjectSize));
// Do the allocation of all three objects in one go.
__ Allocate(r8, rax, rdx, rdi, &runtime, TAG_OBJECT);
// rax = address of new object(s) (tagged)
// rcx = argument count (untagged)
// Get the arguments boilerplate from the current native context into rdi.
Label has_mapped_parameters, copy;
__ movp(rdi, Operand(rsi, Context::SlotOffset(Context::GLOBAL_OBJECT_INDEX)));
__ movp(rdi, FieldOperand(rdi, GlobalObject::kNativeContextOffset));
__ testq(rbx, rbx);
__ j(not_zero, &has_mapped_parameters, Label::kNear);
const int kIndex = Context::ARGUMENTS_BOILERPLATE_INDEX;
__ movp(rdi, Operand(rdi, Context::SlotOffset(kIndex)));
__ jmp(&copy, Label::kNear);
const int kAliasedIndex = Context::ALIASED_ARGUMENTS_BOILERPLATE_INDEX;
__ bind(&has_mapped_parameters);
__ movp(rdi, Operand(rdi, Context::SlotOffset(kAliasedIndex)));
__ bind(&copy);
// rax = address of new object (tagged)
// rbx = mapped parameter count (untagged)
// rcx = argument count (untagged)
// rdi = address of boilerplate object (tagged)
// Copy the JS object part.
for (int i = 0; i < JSObject::kHeaderSize; i += kPointerSize) {
__ movp(rdx, FieldOperand(rdi, i));
__ movp(FieldOperand(rax, i), rdx);
}
// Set up the callee in-object property.
STATIC_ASSERT(Heap::kArgumentsCalleeIndex == 1);
__ movp(rdx, args.GetArgumentOperand(0));
__ movp(FieldOperand(rax, JSObject::kHeaderSize +
Heap::kArgumentsCalleeIndex * kPointerSize),
rdx);
// Use the length (smi tagged) and set that as an in-object property too.
// Note: rcx is tagged from here on.
STATIC_ASSERT(Heap::kArgumentsLengthIndex == 0);
__ Integer32ToSmi(rcx, rcx);
__ movp(FieldOperand(rax, JSObject::kHeaderSize +
Heap::kArgumentsLengthIndex * kPointerSize),
rcx);
// Set up the elements pointer in the allocated arguments object.
// If we allocated a parameter map, edi will point there, otherwise to the
// backing store.
__ lea(rdi, Operand(rax, Heap::kArgumentsObjectSize));
__ movp(FieldOperand(rax, JSObject::kElementsOffset), rdi);
// rax = address of new object (tagged)
// rbx = mapped parameter count (untagged)
// rcx = argument count (tagged)
// rdi = address of parameter map or backing store (tagged)
// Initialize parameter map. If there are no mapped arguments, we're done.
Label skip_parameter_map;
__ testq(rbx, rbx);
__ j(zero, &skip_parameter_map);
__ LoadRoot(kScratchRegister, Heap::kNonStrictArgumentsElementsMapRootIndex);
// rbx contains the untagged argument count. Add 2 and tag to write.
__ movp(FieldOperand(rdi, FixedArray::kMapOffset), kScratchRegister);
__ Integer64PlusConstantToSmi(r9, rbx, 2);
__ movp(FieldOperand(rdi, FixedArray::kLengthOffset), r9);
__ movp(FieldOperand(rdi, FixedArray::kHeaderSize + 0 * kPointerSize), rsi);
__ lea(r9, Operand(rdi, rbx, times_pointer_size, kParameterMapHeaderSize));
__ movp(FieldOperand(rdi, FixedArray::kHeaderSize + 1 * kPointerSize), r9);
// 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, parameters_test;
// Load tagged parameter count into r9.
__ Integer32ToSmi(r9, rbx);
__ Move(r8, Smi::FromInt(Context::MIN_CONTEXT_SLOTS));
__ addq(r8, args.GetArgumentOperand(2));
__ subq(r8, r9);
__ Move(r11, factory->the_hole_value());
__ movp(rdx, rdi);
__ lea(rdi, Operand(rdi, rbx, times_pointer_size, kParameterMapHeaderSize));
// r9 = loop variable (tagged)
// r8 = mapping index (tagged)
// r11 = the hole value
// rdx = address of parameter map (tagged)
// rdi = address of backing store (tagged)
__ jmp(&parameters_test, Label::kNear);
__ bind(&parameters_loop);
__ SmiSubConstant(r9, r9, Smi::FromInt(1));
__ SmiToInteger64(kScratchRegister, r9);
__ movp(FieldOperand(rdx, kScratchRegister,
times_pointer_size,
kParameterMapHeaderSize),
r8);
__ movp(FieldOperand(rdi, kScratchRegister,
times_pointer_size,
FixedArray::kHeaderSize),
r11);
__ SmiAddConstant(r8, r8, Smi::FromInt(1));
__ bind(&parameters_test);
__ SmiTest(r9);
__ j(not_zero, &parameters_loop, Label::kNear);
__ bind(&skip_parameter_map);
// rcx = argument count (tagged)
// rdi = address of backing store (tagged)
// Copy arguments header and remaining slots (if there are any).
__ Move(FieldOperand(rdi, FixedArray::kMapOffset),
factory->fixed_array_map());
__ movp(FieldOperand(rdi, FixedArray::kLengthOffset), rcx);
Label arguments_loop, arguments_test;
__ movp(r8, rbx);
__ movp(rdx, args.GetArgumentOperand(1));
// Untag rcx for the loop below.
__ SmiToInteger64(rcx, rcx);
__ lea(kScratchRegister, Operand(r8, times_pointer_size, 0));
__ subq(rdx, kScratchRegister);
__ jmp(&arguments_test, Label::kNear);
__ bind(&arguments_loop);
__ subq(rdx, Immediate(kPointerSize));
__ movp(r9, Operand(rdx, 0));
__ movp(FieldOperand(rdi, r8,
times_pointer_size,
FixedArray::kHeaderSize),
r9);
__ addq(r8, Immediate(1));
__ bind(&arguments_test);
__ cmpq(r8, rcx);
__ j(less, &arguments_loop, Label::kNear);
// Return and remove the on-stack parameters.
__ ret(3 * kPointerSize);
// Do the runtime call to allocate the arguments object.
// rcx = argument count (untagged)
__ bind(&runtime);
__ Integer32ToSmi(rcx, rcx);
__ movp(args.GetArgumentOperand(2), rcx); // Patch argument count.
__ TailCallRuntime(Runtime::kNewArgumentsFast, 3, 1);
}
void ArgumentsAccessStub::GenerateNewNonStrictSlow(MacroAssembler* masm) {
// rsp[0] : return address
// rsp[8] : number of parameters
// rsp[16] : receiver displacement
// rsp[24] : function
// Check if the calling frame is an arguments adaptor frame.
Label runtime;
__ movp(rdx, Operand(rbp, StandardFrameConstants::kCallerFPOffset));
__ movp(rcx, Operand(rdx, StandardFrameConstants::kContextOffset));
__ Cmp(rcx, Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR));
__ j(not_equal, &runtime);
// Patch the arguments.length and the parameters pointer.
StackArgumentsAccessor args(rsp, 3, ARGUMENTS_DONT_CONTAIN_RECEIVER);
__ movp(rcx, Operand(rdx, ArgumentsAdaptorFrameConstants::kLengthOffset));
__ movp(args.GetArgumentOperand(2), rcx);
__ SmiToInteger64(rcx, rcx);
__ lea(rdx, Operand(rdx, rcx, times_pointer_size,
StandardFrameConstants::kCallerSPOffset));
__ movp(args.GetArgumentOperand(1), rdx);
__ bind(&runtime);
__ TailCallRuntime(Runtime::kNewArgumentsFast, 3, 1);
}
void ArgumentsAccessStub::GenerateNewStrict(MacroAssembler* masm) {
// rsp[0] : return address
// rsp[8] : number of parameters
// rsp[16] : receiver displacement
// rsp[24] : function
// Check if the calling frame is an arguments adaptor frame.
Label adaptor_frame, try_allocate, runtime;
__ movp(rdx, Operand(rbp, StandardFrameConstants::kCallerFPOffset));
__ movp(rcx, Operand(rdx, StandardFrameConstants::kContextOffset));
__ Cmp(rcx, Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR));
__ j(equal, &adaptor_frame);
// Get the length from the frame.
StackArgumentsAccessor args(rsp, 3, ARGUMENTS_DONT_CONTAIN_RECEIVER);
__ movp(rcx, args.GetArgumentOperand(2));
__ SmiToInteger64(rcx, rcx);
__ jmp(&try_allocate);
// Patch the arguments.length and the parameters pointer.
__ bind(&adaptor_frame);
__ movp(rcx, Operand(rdx, ArgumentsAdaptorFrameConstants::kLengthOffset));
__ movp(args.GetArgumentOperand(2), rcx);
__ SmiToInteger64(rcx, rcx);
__ lea(rdx, Operand(rdx, rcx, times_pointer_size,
StandardFrameConstants::kCallerSPOffset));
__ movp(args.GetArgumentOperand(1), rdx);
// Try the new space allocation. Start out with computing the size of
// the arguments object and the elements array.
Label add_arguments_object;
__ bind(&try_allocate);
__ testq(rcx, rcx);
__ j(zero, &add_arguments_object, Label::kNear);
__ lea(rcx, Operand(rcx, times_pointer_size, FixedArray::kHeaderSize));
__ bind(&add_arguments_object);
__ addq(rcx, Immediate(Heap::kArgumentsObjectSizeStrict));
// Do the allocation of both objects in one go.
__ Allocate(rcx, rax, rdx, rbx, &runtime, TAG_OBJECT);
// Get the arguments boilerplate from the current native context.
__ movp(rdi, Operand(rsi, Context::SlotOffset(Context::GLOBAL_OBJECT_INDEX)));
__ movp(rdi, FieldOperand(rdi, GlobalObject::kNativeContextOffset));
const int offset =
Context::SlotOffset(Context::STRICT_MODE_ARGUMENTS_BOILERPLATE_INDEX);
__ movp(rdi, Operand(rdi, offset));
// Copy the JS object part.
for (int i = 0; i < JSObject::kHeaderSize; i += kPointerSize) {
__ movp(rbx, FieldOperand(rdi, i));
__ movp(FieldOperand(rax, i), rbx);
}
// Get the length (smi tagged) and set that as an in-object property too.
STATIC_ASSERT(Heap::kArgumentsLengthIndex == 0);
__ movp(rcx, args.GetArgumentOperand(2));
__ movp(FieldOperand(rax, JSObject::kHeaderSize +
Heap::kArgumentsLengthIndex * kPointerSize),
rcx);
// If there are no actual arguments, we're done.
Label done;
__ testq(rcx, rcx);
__ j(zero, &done);
// Get the parameters pointer from the stack.
__ movp(rdx, args.GetArgumentOperand(1));
// Set up the elements pointer in the allocated arguments object and
// initialize the header in the elements fixed array.
__ lea(rdi, Operand(rax, Heap::kArgumentsObjectSizeStrict));
__ movp(FieldOperand(rax, JSObject::kElementsOffset), rdi);
__ LoadRoot(kScratchRegister, Heap::kFixedArrayMapRootIndex);
__ movp(FieldOperand(rdi, FixedArray::kMapOffset), kScratchRegister);
__ movp(FieldOperand(rdi, FixedArray::kLengthOffset), rcx);
// Untag the length for the loop below.
__ SmiToInteger64(rcx, rcx);
// Copy the fixed array slots.
Label loop;
__ bind(&loop);
__ movp(rbx, Operand(rdx, -1 * kPointerSize)); // Skip receiver.
__ movp(FieldOperand(rdi, FixedArray::kHeaderSize), rbx);
__ addq(rdi, Immediate(kPointerSize));
__ subq(rdx, Immediate(kPointerSize));
__ decq(rcx);
__ j(not_zero, &loop);
// Return and remove the on-stack parameters.
__ bind(&done);
__ ret(3 * kPointerSize);
// Do the runtime call to allocate the arguments object.
__ bind(&runtime);
__ TailCallRuntime(Runtime::kNewStrictArgumentsFast, 3, 1);
}
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, 4, 1);
#else // V8_INTERPRETED_REGEXP
// Stack frame on entry.
// rsp[0] : return address
// rsp[8] : last_match_info (expected JSArray)
// rsp[16] : previous index
// rsp[24] : subject string
// rsp[32] : JSRegExp object
enum RegExpExecStubArgumentIndices {
JS_REG_EXP_OBJECT_ARGUMENT_INDEX,
SUBJECT_STRING_ARGUMENT_INDEX,
PREVIOUS_INDEX_ARGUMENT_INDEX,
LAST_MATCH_INFO_ARGUMENT_INDEX,
REG_EXP_EXEC_ARGUMENT_COUNT
};
StackArgumentsAccessor args(rsp, REG_EXP_EXEC_ARGUMENT_COUNT,
ARGUMENTS_DONT_CONTAIN_RECEIVER);
Label runtime;
// Ensure that a RegExp stack is allocated.
Isolate* isolate = masm->isolate();
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);
__ Load(kScratchRegister, address_of_regexp_stack_memory_size);
__ testq(kScratchRegister, kScratchRegister);
__ j(zero, &runtime);
// Check that the first argument is a JSRegExp object.
__ movp(rax, args.GetArgumentOperand(JS_REG_EXP_OBJECT_ARGUMENT_INDEX));
__ JumpIfSmi(rax, &runtime);
__ CmpObjectType(rax, JS_REGEXP_TYPE, kScratchRegister);
__ j(not_equal, &runtime);
// Check that the RegExp has been compiled (data contains a fixed array).
__ movp(rax, FieldOperand(rax, JSRegExp::kDataOffset));
if (FLAG_debug_code) {
Condition is_smi = masm->CheckSmi(rax);
__ Check(NegateCondition(is_smi),
kUnexpectedTypeForRegExpDataFixedArrayExpected);
__ CmpObjectType(rax, FIXED_ARRAY_TYPE, kScratchRegister);
__ Check(equal, kUnexpectedTypeForRegExpDataFixedArrayExpected);
}
// rax: RegExp data (FixedArray)
// Check the type of the RegExp. Only continue if type is JSRegExp::IRREGEXP.
__ SmiToInteger32(rbx, FieldOperand(rax, JSRegExp::kDataTagOffset));
__ cmpl(rbx, Immediate(JSRegExp::IRREGEXP));
__ j(not_equal, &runtime);
// rax: RegExp data (FixedArray)
// Check that the number of captures fit in the static offsets vector buffer.
__ SmiToInteger32(rdx,
FieldOperand(rax, JSRegExp::kIrregexpCaptureCountOffset));
// Check (number_of_captures + 1) * 2 <= offsets vector size
// Or number_of_captures <= offsets vector size / 2 - 1
STATIC_ASSERT(Isolate::kJSRegexpStaticOffsetsVectorSize >= 2);
__ cmpl(rdx, Immediate(Isolate::kJSRegexpStaticOffsetsVectorSize / 2 - 1));
__ j(above, &runtime);
// Reset offset for possibly sliced string.
__ Set(r14, 0);
__ movp(rdi, args.GetArgumentOperand(SUBJECT_STRING_ARGUMENT_INDEX));
__ JumpIfSmi(rdi, &runtime);
__ movp(r15, rdi); // Make a copy of the original subject string.
__ movp(rbx, FieldOperand(rdi, HeapObject::kMapOffset));
__ movzxbl(rbx, FieldOperand(rbx, Map::kInstanceTypeOffset));
// rax: RegExp data (FixedArray)
// rdi: subject string
// r15: subject string
// Handle subject string according to its encoding and representation:
// (1) Sequential two byte? If yes, go to (9).
// (2) Sequential one byte? If yes, go to (6).
// (3) Anything but sequential or cons? If yes, go to (7).
// (4) Cons string. If the string is flat, replace subject with first string.
// Otherwise bailout.
// (5a) Is subject sequential two byte? If yes, go to (9).
// (5b) Is subject external? If yes, go to (8).
// (6) One byte sequential. Load regexp code for one byte.
// (E) Carry on.
/// [...]
// Deferred code at the end of the stub:
// (7) Not a long external string? If yes, go to (10).
// (8) External string. Make it, offset-wise, look like a sequential string.
// (8a) Is the external string one byte? If yes, go to (6).
// (9) Two byte sequential. Load regexp code for one byte. Go to (E).
// (10) Short external string or not a string? If yes, bail out to runtime.
// (11) Sliced string. Replace subject with parent. Go to (5a).
Label seq_one_byte_string /* 6 */, seq_two_byte_string /* 9 */,
external_string /* 8 */, check_underlying /* 5a */,
not_seq_nor_cons /* 7 */, check_code /* E */,
not_long_external /* 10 */;
// (1) Sequential two byte? If yes, go to (9).
__ andb(rbx, Immediate(kIsNotStringMask |
kStringRepresentationMask |
kStringEncodingMask |
kShortExternalStringMask));
STATIC_ASSERT((kStringTag | kSeqStringTag | kTwoByteStringTag) == 0);
__ j(zero, &seq_two_byte_string); // Go to (9).
// (2) Sequential one byte? If yes, go to (6).
// Any other sequential string must be one byte.
__ andb(rbx, Immediate(kIsNotStringMask |
kStringRepresentationMask |
kShortExternalStringMask));
__ j(zero, &seq_one_byte_string, Label::kNear); // Go to (6).
// (3) Anything but sequential or cons? If yes, go to (7).
// We check whether the subject string is a cons, since sequential strings
// have already been covered.
STATIC_ASSERT(kConsStringTag < kExternalStringTag);
STATIC_ASSERT(kSlicedStringTag > kExternalStringTag);
STATIC_ASSERT(kIsNotStringMask > kExternalStringTag);
STATIC_ASSERT(kShortExternalStringTag > kExternalStringTag);
__ cmpq(rbx, Immediate(kExternalStringTag));
__ j(greater_equal, &not_seq_nor_cons); // Go to (7).
// (4) Cons string. Check that it's flat.
// Replace subject with first string and reload instance type.
__ CompareRoot(FieldOperand(rdi, ConsString::kSecondOffset),
Heap::kempty_stringRootIndex);
__ j(not_equal, &runtime);
__ movp(rdi, FieldOperand(rdi, ConsString::kFirstOffset));
__ bind(&check_underlying);
__ movp(rbx, FieldOperand(rdi, HeapObject::kMapOffset));
__ movp(rbx, FieldOperand(rbx, Map::kInstanceTypeOffset));
// (5a) Is subject sequential two byte? If yes, go to (9).
__ testb(rbx, Immediate(kStringRepresentationMask | kStringEncodingMask));
STATIC_ASSERT((kSeqStringTag | kTwoByteStringTag) == 0);
__ j(zero, &seq_two_byte_string); // Go to (9).
// (5b) Is subject external? If yes, go to (8).
__ testb(rbx, Immediate(kStringRepresentationMask));
// The underlying external string is never a short external string.
STATIC_CHECK(ExternalString::kMaxShortLength < ConsString::kMinLength);
STATIC_CHECK(ExternalString::kMaxShortLength < SlicedString::kMinLength);
__ j(not_zero, &external_string); // Go to (8)
// (6) One byte sequential. Load regexp code for one byte.
__ bind(&seq_one_byte_string);
// rax: RegExp data (FixedArray)
__ movp(r11, FieldOperand(rax, JSRegExp::kDataAsciiCodeOffset));
__ Set(rcx, 1); // Type is one byte.
// (E) Carry on. String handling is done.
__ bind(&check_code);
// r11: 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
// smi (code flushing support)
__ JumpIfSmi(r11, &runtime);
// rdi: sequential subject string (or look-alike, external string)
// r15: original subject string
// rcx: encoding of subject string (1 if ASCII, 0 if two_byte);
// r11: code
// Load used arguments before starting to push arguments for call to native
// RegExp code to avoid handling changing stack height.
// We have to use r15 instead of rdi to load the length because rdi might
// have been only made to look like a sequential string when it actually
// is an external string.
__ movp(rbx, args.GetArgumentOperand(PREVIOUS_INDEX_ARGUMENT_INDEX));
__ JumpIfNotSmi(rbx, &runtime);
__ SmiCompare(rbx, FieldOperand(r15, String::kLengthOffset));
__ j(above_equal, &runtime);
__ SmiToInteger64(rbx, rbx);
// rdi: subject string
// rbx: previous index
// rcx: encoding of subject string (1 if ASCII 0 if two_byte);
// r11: code
// All checks done. Now push arguments for native regexp code.
Counters* counters = masm->isolate()->counters();
__ IncrementCounter(counters->regexp_entry_native(), 1);
// Isolates: note we add an additional parameter here (isolate pointer).
static const int kRegExpExecuteArguments = 9;
int argument_slots_on_stack =
masm->ArgumentStackSlotsForCFunctionCall(kRegExpExecuteArguments);
__ EnterApiExitFrame(argument_slots_on_stack);
// Argument 9: Pass current isolate address.
__ LoadAddress(kScratchRegister,
ExternalReference::isolate_address(masm->isolate()));
__ movq(Operand(rsp, (argument_slots_on_stack - 1) * kRegisterSize),
kScratchRegister);
// Argument 8: Indicate that this is a direct call from JavaScript.
__ movq(Operand(rsp, (argument_slots_on_stack - 2) * kRegisterSize),
Immediate(1));
// Argument 7: Start (high end) of backtracking stack memory area.
__ Move(kScratchRegister, address_of_regexp_stack_memory_address);
__ movp(r9, Operand(kScratchRegister, 0));
__ Move(kScratchRegister, address_of_regexp_stack_memory_size);
__ addq(r9, Operand(kScratchRegister, 0));
__ movq(Operand(rsp, (argument_slots_on_stack - 3) * kRegisterSize), r9);
// Argument 6: Set the number of capture registers to zero to force global
// regexps to behave as non-global. This does not affect non-global regexps.
// Argument 6 is passed in r9 on Linux and on the stack on Windows.
#ifdef _WIN64
__ movq(Operand(rsp, (argument_slots_on_stack - 4) * kRegisterSize),
Immediate(0));
#else
__ Set(r9, 0);
#endif
// Argument 5: static offsets vector buffer.
__ LoadAddress(r8,
ExternalReference::address_of_static_offsets_vector(isolate));
// Argument 5 passed in r8 on Linux and on the stack on Windows.
#ifdef _WIN64
__ movq(Operand(rsp, (argument_slots_on_stack - 5) * kRegisterSize), r8);
#endif
// rdi: subject string
// rbx: previous index
// rcx: encoding of subject string (1 if ASCII 0 if two_byte);
// r11: code
// r14: slice offset
// r15: original subject string
// Argument 2: Previous index.
__ movp(arg_reg_2, rbx);
// Argument 4: End of string data
// Argument 3: Start of string data
Label setup_two_byte, setup_rest, got_length, length_not_from_slice;
// Prepare start and end index of the input.
// Load the length from the original sliced string if that is the case.
__ addq(rbx, r14);
__ SmiToInteger32(arg_reg_3, FieldOperand(r15, String::kLengthOffset));
__ addq(r14, arg_reg_3); // Using arg3 as scratch.
// rbx: start index of the input
// r14: end index of the input
// r15: original subject string
__ testb(rcx, rcx); // Last use of rcx as encoding of subject string.
__ j(zero, &setup_two_byte, Label::kNear);
__ lea(arg_reg_4,
FieldOperand(rdi, r14, times_1, SeqOneByteString::kHeaderSize));
__ lea(arg_reg_3,
FieldOperand(rdi, rbx, times_1, SeqOneByteString::kHeaderSize));
__ jmp(&setup_rest, Label::kNear);
__ bind(&setup_two_byte);
__ lea(arg_reg_4,
FieldOperand(rdi, r14, times_2, SeqTwoByteString::kHeaderSize));
__ lea(arg_reg_3,
FieldOperand(rdi, rbx, times_2, SeqTwoByteString::kHeaderSize));
__ bind(&setup_rest);
// Argument 1: Original subject string.
// The original subject is in the previous stack frame. Therefore we have to
// use rbp, which points exactly to one pointer size below the previous rsp.
// (Because creating a new stack frame pushes the previous rbp onto the stack
// and thereby moves up rsp by one kPointerSize.)
__ movp(arg_reg_1, r15);
// Locate the code entry and call it.
__ addq(r11, Immediate(Code::kHeaderSize - kHeapObjectTag));
__ call(r11);
__ LeaveApiExitFrame(true);
// Check the result.
Label success;
Label exception;
__ cmpl(rax, Immediate(1));
// We expect exactly one result since we force the called regexp to behave
// as non-global.
__ j(equal, &success, Label::kNear);
__ cmpl(rax, Immediate(NativeRegExpMacroAssembler::EXCEPTION));
__ j(equal, &exception);
__ cmpl(rax, Immediate(NativeRegExpMacroAssembler::FAILURE));
// If none of the above, it can only be retry.
// Handle that in the runtime system.
__ j(not_equal, &runtime);
// For failure return null.
__ LoadRoot(rax, Heap::kNullValueRootIndex);
__ ret(REG_EXP_EXEC_ARGUMENT_COUNT * kPointerSize);
// Load RegExp data.
__ bind(&success);
__ movp(rax, args.GetArgumentOperand(JS_REG_EXP_OBJECT_ARGUMENT_INDEX));
__ movp(rcx, FieldOperand(rax, JSRegExp::kDataOffset));
__ SmiToInteger32(rax,
FieldOperand(rcx, JSRegExp::kIrregexpCaptureCountOffset));
// Calculate number of capture registers (number_of_captures + 1) * 2.
__ leal(rdx, Operand(rax, rax, times_1, 2));
// rdx: Number of capture registers
// Check that the fourth object is a JSArray object.
__ movp(r15, args.GetArgumentOperand(LAST_MATCH_INFO_ARGUMENT_INDEX));
__ JumpIfSmi(r15, &runtime);
__ CmpObjectType(r15, JS_ARRAY_TYPE, kScratchRegister);
__ j(not_equal, &runtime);
// Check that the JSArray is in fast case.
__ movp(rbx, FieldOperand(r15, JSArray::kElementsOffset));
__ movp(rax, FieldOperand(rbx, HeapObject::kMapOffset));
__ CompareRoot(rax, Heap::kFixedArrayMapRootIndex);
__ j(not_equal, &runtime);
// Check that the last match info has space for the capture registers and the
// additional information. Ensure no overflow in add.
STATIC_ASSERT(FixedArray::kMaxLength < kMaxInt - FixedArray::kLengthOffset);
__ SmiToInteger32(rax, FieldOperand(rbx, FixedArray::kLengthOffset));
__ subl(rax, Immediate(RegExpImpl::kLastMatchOverhead));
__ cmpl(rdx, rax);
__ j(greater, &runtime);
// rbx: last_match_info backing store (FixedArray)
// rdx: number of capture registers
// Store the capture count.
__ Integer32ToSmi(kScratchRegister, rdx);
__ movp(FieldOperand(rbx, RegExpImpl::kLastCaptureCountOffset),
kScratchRegister);
// Store last subject and last input.
__ movp(rax, args.GetArgumentOperand(SUBJECT_STRING_ARGUMENT_INDEX));
__ movp(FieldOperand(rbx, RegExpImpl::kLastSubjectOffset), rax);
__ movp(rcx, rax);
__ RecordWriteField(rbx,
RegExpImpl::kLastSubjectOffset,
rax,
rdi,
kDontSaveFPRegs);
__ movp(rax, rcx);
__ movp(FieldOperand(rbx, RegExpImpl::kLastInputOffset), rax);
__ RecordWriteField(rbx,
RegExpImpl::kLastInputOffset,
rax,
rdi,
kDontSaveFPRegs);
// Get the static offsets vector filled by the native regexp code.
__ LoadAddress(rcx,
ExternalReference::address_of_static_offsets_vector(isolate));
// rbx: last_match_info backing store (FixedArray)
// rcx: offsets vector
// rdx: number of capture registers
Label next_capture, done;
// Capture register counter starts from number of capture registers and
// counts down until wraping after zero.
__ bind(&next_capture);
__ subq(rdx, Immediate(1));
__ j(negative, &done, Label::kNear);
// Read the value from the static offsets vector buffer and make it a smi.
__ movl(rdi, Operand(rcx, rdx, times_int_size, 0));
__ Integer32ToSmi(rdi, rdi);
// Store the smi value in the last match info.
__ movp(FieldOperand(rbx,
rdx,
times_pointer_size,
RegExpImpl::kFirstCaptureOffset),
rdi);
__ jmp(&next_capture);
__ bind(&done);
// Return last match info.
__ movp(rax, r15);
__ ret(REG_EXP_EXEC_ARGUMENT_COUNT * kPointerSize);
__ bind(&exception);
// 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.
ExternalReference pending_exception_address(
Isolate::kPendingExceptionAddress, isolate);
Operand pending_exception_operand =
masm->ExternalOperand(pending_exception_address, rbx);
__ movp(rax, pending_exception_operand);
__ LoadRoot(rdx, Heap::kTheHoleValueRootIndex);
__ cmpq(rax, rdx);
__ j(equal, &runtime);
__ movp(pending_exception_operand, rdx);
__ CompareRoot(rax, Heap::kTerminationExceptionRootIndex);
Label termination_exception;
__ j(equal, &termination_exception, Label::kNear);
__ Throw(rax);
__ bind(&termination_exception);
__ ThrowUncatchable(rax);
// Do the runtime call to execute the regexp.
__ bind(&runtime);
__ TailCallRuntime(Runtime::kRegExpExec, 4, 1);
// Deferred code for string handling.
// (7) Not a long external string? If yes, go to (10).
__ bind(&not_seq_nor_cons);
// Compare flags are still set from (3).
__ j(greater, &not_long_external, Label::kNear); // Go to (10).
// (8) External string. Short external strings have been ruled out.
__ bind(&external_string);
__ movp(rbx, FieldOperand(rdi, HeapObject::kMapOffset));
__ movzxbl(rbx, FieldOperand(rbx, 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.
__ testb(rbx, Immediate(kIsIndirectStringMask));
__ Assert(zero, kExternalStringExpectedButNotFound);
}
__ movp(rdi, FieldOperand(rdi, ExternalString::kResourceDataOffset));
// Move the pointer so that offset-wise, it looks like a sequential string.
STATIC_ASSERT(SeqTwoByteString::kHeaderSize == SeqOneByteString::kHeaderSize);
__ subq(rdi, Immediate(SeqTwoByteString::kHeaderSize - kHeapObjectTag));
STATIC_ASSERT(kTwoByteStringTag == 0);
// (8a) Is the external string one byte? If yes, go to (6).
__ testb(rbx, Immediate(kStringEncodingMask));
__ j(not_zero, &seq_one_byte_string); // Goto (6).
// rdi: subject string (flat two-byte)
// rax: RegExp data (FixedArray)
// (9) Two byte sequential. Load regexp code for one byte. Go to (E).
__ bind(&seq_two_byte_string);
__ movp(r11, FieldOperand(rax, JSRegExp::kDataUC16CodeOffset));
__ Set(rcx, 0); // Type is two byte.
__ jmp(&check_code); // Go to (E).
// (10) Not a string or a short external string? If yes, bail out to runtime.
__ bind(&not_long_external);
// Catch non-string subject or short external string.
STATIC_ASSERT(kNotStringTag != 0 && kShortExternalStringTag !=0);
__ testb(rbx, Immediate(kIsNotStringMask | kShortExternalStringMask));
__ j(not_zero, &runtime);
// (11) Sliced string. Replace subject with parent. Go to (5a).
// Load offset into r14 and replace subject string with parent.
__ SmiToInteger32(r14, FieldOperand(rdi, SlicedString::kOffsetOffset));
__ movp(rdi, FieldOperand(rdi, SlicedString::kParentOffset));
__ jmp(&check_underlying);
#endif // V8_INTERPRETED_REGEXP
}
static int NegativeComparisonResult(Condition cc) {
ASSERT(cc != equal);
ASSERT((cc == less) || (cc == less_equal)
|| (cc == greater) || (cc == greater_equal));
return (cc == greater || cc == greater_equal) ? LESS : GREATER;
}
static void CheckInputType(MacroAssembler* masm,
Register input,
CompareIC::State expected,
Label* fail) {
Label ok;
if (expected == CompareIC::SMI) {
__ JumpIfNotSmi(input, fail);
} else if (expected == CompareIC::NUMBER) {
__ JumpIfSmi(input, &ok);
__ CompareMap(input, masm->isolate()->factory()->heap_number_map());
__ j(not_equal, fail);
}
// 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);
}
static void BranchIfNotInternalizedString(MacroAssembler* masm,
Label* label,
Register object,
Register scratch) {
__ JumpIfSmi(object, label);
__ movp(scratch, FieldOperand(object, HeapObject::kMapOffset));
__ movzxbq(scratch,
FieldOperand(scratch, Map::kInstanceTypeOffset));
STATIC_ASSERT(kInternalizedTag == 0 && kStringTag == 0);
__ testb(scratch, Immediate(kIsNotStringMask | kIsNotInternalizedMask));
__ j(not_zero, label);
}
void ICCompareStub::GenerateGeneric(MacroAssembler* masm) {
Label check_unequal_objects, done;
Condition cc = GetCondition();
Factory* factory = masm->isolate()->factory();
Label miss;
CheckInputType(masm, rdx, left_, &miss);
CheckInputType(masm, rax, right_, &miss);
// Compare two smis.
Label non_smi, smi_done;
__ JumpIfNotBothSmi(rax, rdx, &non_smi);
__ subq(rdx, rax);
__ j(no_overflow, &smi_done);
__ not_(rdx); // Correct sign in case of overflow. rdx cannot be 0 here.
__ bind(&smi_done);
__ movp(rax, rdx);
__ ret(0);
__ bind(&non_smi);
// The compare stub returns a positive, negative, or zero 64-bit integer
// value in rax, corresponding to result of comparing the two inputs.
// 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.
// Two identical objects are equal unless they are both NaN or undefined.
{
Label not_identical;
__ cmpq(rax, rdx);
__ j(not_equal, &not_identical, Label::kNear);
if (cc != equal) {
// Check for undefined. undefined OP undefined is false even though
// undefined == undefined.
Label check_for_nan;
__ CompareRoot(rdx, Heap::kUndefinedValueRootIndex);
__ j(not_equal, &check_for_nan, Label::kNear);
__ Set(rax, NegativeComparisonResult(cc));
__ ret(0);
__ bind(&check_for_nan);
}
// Test for NaN. Sadly, we can't just compare to Factory::nan_value(),
// so we do the second best thing - test it ourselves.
Label heap_number;
// If it's not a heap number, then return equal for (in)equality operator.
__ Cmp(FieldOperand(rdx, HeapObject::kMapOffset),
factory->heap_number_map());
__ j(equal, &heap_number, Label::kNear);
if (cc != equal) {
// Call runtime on identical objects. Otherwise return equal.
__ CmpObjectType(rax, FIRST_SPEC_OBJECT_TYPE, rcx);
__ j(above_equal, &not_identical, Label::kNear);
}
__ Set(rax, EQUAL);
__ ret(0);
__ bind(&heap_number);
// It is a heap number, so return equal if it's not NaN.
// For NaN, return 1 for every condition except greater and
// greater-equal. Return -1 for them, so the comparison yields
// false for all conditions except not-equal.
__ Set(rax, EQUAL);
__ movsd(xmm0, FieldOperand(rdx, HeapNumber::kValueOffset));
__ ucomisd(xmm0, xmm0);
__ setcc(parity_even, rax);
// rax is 0 for equal non-NaN heapnumbers, 1 for NaNs.
if (cc == greater_equal || cc == greater) {
__ neg(rax);
}
__ ret(0);
__ bind(&not_identical);
}
if (cc == equal) { // Both strict and non-strict.
Label slow; // Fallthrough label.
// If we're doing a strict equality comparison, we don't have to do
// type conversion, so we generate code to do fast comparison for objects
// and oddballs. Non-smi numbers and strings still go through the usual
// slow-case code.
if (strict()) {
// If either is a Smi (we know that not both are), then they can only
// be equal if the other is a HeapNumber. If so, use the slow case.
{
Label not_smis;
__ SelectNonSmi(rbx, rax, rdx, &not_smis);
// Check if the non-smi operand is a heap number.
__ Cmp(FieldOperand(rbx, HeapObject::kMapOffset),
factory->heap_number_map());
// If heap number, handle it in the slow case.
__ j(equal, &slow);
// Return non-equal. ebx (the lower half of rbx) is not zero.
__ movp(rax, rbx);
__ ret(0);
__ bind(&not_smis);
}
// If either operand is a JSObject or an oddball value, then they are not
// equal since their pointers are different
// There is no test for undetectability in strict equality.
// If the first object is a JS object, we have done pointer comparison.
STATIC_ASSERT(LAST_TYPE == LAST_SPEC_OBJECT_TYPE);
Label first_non_object;
__ CmpObjectType(rax, FIRST_SPEC_OBJECT_TYPE, rcx);
__ j(below, &first_non_object, Label::kNear);
// Return non-zero (rax (not rax) is not zero)
Label return_not_equal;
STATIC_ASSERT(kHeapObjectTag != 0);
__ bind(&return_not_equal);
__ ret(0);
__ bind(&first_non_object);
// Check for oddballs: true, false, null, undefined.
__ CmpInstanceType(rcx, ODDBALL_TYPE);
__ j(equal, &return_not_equal);
__ CmpObjectType(rdx, FIRST_SPEC_OBJECT_TYPE, rcx);
__ j(above_equal, &return_not_equal);
// Check for oddballs: true, false, null, undefined.
__ CmpInstanceType(rcx, ODDBALL_TYPE);
__ j(equal, &return_not_equal);
// Fall through to the general case.
}
__ bind(&slow);
}
// Generate the number comparison code.
Label non_number_comparison;
Label unordered;
FloatingPointHelper::LoadSSE2UnknownOperands(masm, &non_number_comparison);
__ xorl(rax, rax);
__ xorl(rcx, rcx);
__ ucomisd(xmm0, xmm1);
// Don't base result on EFLAGS when a NaN is involved.
__ j(parity_even, &unordered, Label::kNear);
// Return a result of -1, 0, or 1, based on EFLAGS.
__ setcc(above, rax);
__ setcc(below, rcx);
__ subq(rax, rcx);
__ ret(0);
// If one of the numbers was NaN, then the result is always false.
// The cc is never not-equal.
__ bind(&unordered);
ASSERT(cc != not_equal);
if (cc == less || cc == less_equal) {
__ Set(rax, 1);
} else {
__ Set(rax, -1);
}
__ ret(0);
// The number comparison code did not provide a valid result.
__ bind(&non_number_comparison);
// Fast negative check for internalized-to-internalized equality.
Label check_for_strings;
if (cc == equal) {
BranchIfNotInternalizedString(
masm, &check_for_strings, rax, kScratchRegister);
BranchIfNotInternalizedString(
masm, &check_for_strings, rdx, kScratchRegister);
// We've already checked for object identity, so if both operands are
// internalized strings they aren't equal. Register rax (not rax) already
// holds a non-zero value, which indicates not equal, so just return.
__ ret(0);
}
__ bind(&check_for_strings);
__ JumpIfNotBothSequentialAsciiStrings(
rdx, rax, rcx, rbx, &check_unequal_objects);
// Inline comparison of ASCII strings.
if (cc == equal) {
StringCompareStub::GenerateFlatAsciiStringEquals(masm,
rdx,
rax,
rcx,
rbx);
} else {
StringCompareStub::GenerateCompareFlatAsciiStrings(masm,
rdx,
rax,
rcx,
rbx,
rdi,
r8);
}
#ifdef DEBUG
__ Abort(kUnexpectedFallThroughFromStringComparison);
#endif
__ bind(&check_unequal_objects);
if (cc == equal && !strict()) {
// Not strict equality. Objects are unequal if
// they are both JSObjects and not undetectable,
// and their pointers are different.
Label not_both_objects, return_unequal;
// At most one is a smi, so we can test for smi by adding the two.
// A smi plus a heap object has the low bit set, a heap object plus
// a heap object has the low bit clear.
STATIC_ASSERT(kSmiTag == 0);
STATIC_ASSERT(kSmiTagMask == 1);
__ lea(rcx, Operand(rax, rdx, times_1, 0));
__ testb(rcx, Immediate(kSmiTagMask));
__ j(not_zero, &not_both_objects, Label::kNear);
__ CmpObjectType(rax, FIRST_SPEC_OBJECT_TYPE, rbx);
__ j(below, &not_both_objects, Label::kNear);
__ CmpObjectType(rdx, FIRST_SPEC_OBJECT_TYPE, rcx);
__ j(below, &not_both_objects, Label::kNear);
__ testb(FieldOperand(rbx, Map::kBitFieldOffset),
Immediate(1 << Map::kIsUndetectable));
__ j(zero, &return_unequal, Label::kNear);
__ testb(FieldOperand(rcx, Map::kBitFieldOffset),
Immediate(1 << Map::kIsUndetectable));
__ j(zero, &return_unequal, Label::kNear);
// The objects are both undetectable, so they both compare as the value
// undefined, and are equal.
__ Set(rax, EQUAL);
__ bind(&return_unequal);
// Return non-equal by returning the non-zero object pointer in rax,
// or return equal if we fell through to here.
__ ret(0);
__ bind(&not_both_objects);
}
// Push arguments below the return address to prepare jump to builtin.
__ PopReturnAddressTo(rcx);
__ push(rdx);
__ push(rax);
// Figure out which native to call and setup the arguments.
Builtins::JavaScript builtin;
if (cc == equal) {
builtin = strict() ? Builtins::STRICT_EQUALS : Builtins::EQUALS;
} else {
builtin = Builtins::COMPARE;
__ Push(Smi::FromInt(NegativeComparisonResult(cc)));
}
__ PushReturnAddressFrom(rcx);
// Call the native; it returns -1 (less), 0 (equal), or 1 (greater)
// tagged as a small integer.
__ InvokeBuiltin(builtin, JUMP_FUNCTION);
__ bind(&miss);
GenerateMiss(masm);
}
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.
// rax : number of arguments to the construct function
// rbx : Feedback vector
// rdx : slot in feedback vector (Smi)
// rdi : the function to call
Isolate* isolate = masm->isolate();
Label initialize, done, miss, megamorphic, not_array_function,
done_no_smi_convert;
// Load the cache state into rcx.
__ SmiToInteger32(rdx, rdx);
__ movp(rcx, FieldOperand(rbx, rdx, times_pointer_size,
FixedArray::kHeaderSize));
// A monomorphic cache hit or an already megamorphic state: invoke the
// function without changing the state.
__ cmpq(rcx, rdi);
__ j(equal, &done);
__ Cmp(rcx, TypeFeedbackInfo::MegamorphicSentinel(isolate));
__ j(equal, &done);
// 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. Do a map check on the object in rcx.
Handle<Map> allocation_site_map =
masm->isolate()->factory()->allocation_site_map();
__ Cmp(FieldOperand(rcx, 0), allocation_site_map);
__ j(not_equal, &miss);
// Make sure the function is the Array() function
__ LoadGlobalFunction(Context::ARRAY_FUNCTION_INDEX, rcx);
__ cmpq(rdi, rcx);
__ j(not_equal, &megamorphic);
__ jmp(&done);
__ bind(&miss);
// A monomorphic miss (i.e, here the cache is not uninitialized) goes
// megamorphic.
__ Cmp(rcx, TypeFeedbackInfo::UninitializedSentinel(isolate));
__ j(equal, &initialize);
// MegamorphicSentinel is an immortal immovable object (undefined) so no
// write-barrier is needed.
__ bind(&megamorphic);
__ Move(FieldOperand(rbx, rdx, times_pointer_size, FixedArray::kHeaderSize),
TypeFeedbackInfo::MegamorphicSentinel(isolate));
__ jmp(&done);
// An uninitialized cache is patched with the function or sentinel to
// indicate the ElementsKind if function is the Array constructor.
__ bind(&initialize);
// Make sure the function is the Array() function
__ LoadGlobalFunction(Context::ARRAY_FUNCTION_INDEX, rcx);
__ cmpq(rdi, rcx);
__ j(not_equal, &not_array_function);
// The target function is the Array constructor,
// Create an AllocationSite if we don't already have it, store it in the slot.
{
FrameScope scope(masm, StackFrame::INTERNAL);
// Arguments register must be smi-tagged to call out.
__ Integer32ToSmi(rax, rax);
__ push(rax);
__ push(rdi);
__ Integer32ToSmi(rdx, rdx);
__ push(rdx);
__ push(rbx);
CreateAllocationSiteStub create_stub;
__ CallStub(&create_stub);
__ pop(rbx);
__ pop(rdx);
__ pop(rdi);
__ pop(rax);
__ SmiToInteger32(rax, rax);
}
__ jmp(&done_no_smi_convert);
__ bind(&not_array_function);
__ movp(FieldOperand(rbx, rdx, times_pointer_size, FixedArray::kHeaderSize),
rdi);
// We won't need rdx or rbx anymore, just save rdi
__ push(rdi);
__ push(rbx);
__ push(rdx);
__ RecordWriteArray(rbx, rdi, rdx, kDontSaveFPRegs,
EMIT_REMEMBERED_SET, OMIT_SMI_CHECK);
__ pop(rdx);
__ pop(rbx);
__ pop(rdi);
__ bind(&done);
__ Integer32ToSmi(rdx, rdx);
__ bind(&done_no_smi_convert);
}
void CallFunctionStub::Generate(MacroAssembler* masm) {
// rbx : feedback vector
// rdx : (only if rbx is not the megamorphic symbol) slot in feedback
// vector (Smi)
// rdi : the function to call
Isolate* isolate = masm->isolate();
Label slow, non_function, wrap, cont;
StackArgumentsAccessor args(rsp, argc_);
if (NeedsChecks()) {
// Check that the function really is a JavaScript function.
__ JumpIfSmi(rdi, &non_function);
// Goto slow case if we do not have a function.
__ CmpObjectType(rdi, JS_FUNCTION_TYPE, rcx);
__ j(not_equal, &slow);
if (RecordCallTarget()) {
GenerateRecordCallTarget(masm);
}
}
// Fast-case: Just invoke the function.
ParameterCount actual(argc_);
if (CallAsMethod()) {
if (NeedsChecks()) {
// Do not transform the receiver for strict mode functions.
__ movp(rcx, FieldOperand(rdi, JSFunction::kSharedFunctionInfoOffset));
__ testb(FieldOperand(rcx, SharedFunctionInfo::kStrictModeByteOffset),
Immediate(1 << SharedFunctionInfo::kStrictModeBitWithinByte));
__ j(not_equal, &cont);
// Do not transform the receiver for natives.
// SharedFunctionInfo is already loaded into rcx.
__ testb(FieldOperand(rcx, SharedFunctionInfo::kNativeByteOffset),
Immediate(1 << SharedFunctionInfo::kNativeBitWithinByte));
__ j(not_equal, &cont);
}
// Load the receiver from the stack.
__ movp(rax, args.GetReceiverOperand());
if (NeedsChecks()) {
__ JumpIfSmi(rax, &wrap);
__ CmpObjectType(rax, FIRST_SPEC_OBJECT_TYPE, rcx);
__ j(below, &wrap);
} else {
__ jmp(&wrap);
}
__ bind(&cont);
}
__ InvokeFunction(rdi, actual, JUMP_FUNCTION, NullCallWrapper());
if (NeedsChecks()) {
// Slow-case: Non-function called.
__ bind(&slow);
if (RecordCallTarget()) {
// If there is a call target cache, mark it megamorphic in the
// non-function case. MegamorphicSentinel is an immortal immovable
// object (megamorphic symbol) so no write barrier is needed.
__ SmiToInteger32(rdx, rdx);
__ Move(FieldOperand(rbx, rdx, times_pointer_size,
FixedArray::kHeaderSize),
TypeFeedbackInfo::MegamorphicSentinel(isolate));
__ Integer32ToSmi(rdx, rdx);
}
// Check for function proxy.
__ CmpInstanceType(rcx, JS_FUNCTION_PROXY_TYPE);
__ j(not_equal, &non_function);
__ PopReturnAddressTo(rcx);
__ push(rdi); // put proxy as additional argument under return address
__ PushReturnAddressFrom(rcx);
__ Set(rax, argc_ + 1);
__ Set(rbx, 0);
__ GetBuiltinEntry(rdx, Builtins::CALL_FUNCTION_PROXY);
{
Handle<Code> adaptor =
masm->isolate()->builtins()->ArgumentsAdaptorTrampoline();
__ jmp(adaptor, RelocInfo::CODE_TARGET);
}
// CALL_NON_FUNCTION expects the non-function callee as receiver (instead
// of the original receiver from the call site).
__ bind(&non_function);
__ movp(args.GetReceiverOperand(), rdi);
__ Set(rax, argc_);
__ Set(rbx, 0);
__ GetBuiltinEntry(rdx, Builtins::CALL_NON_FUNCTION);
Handle<Code> adaptor =
isolate->builtins()->ArgumentsAdaptorTrampoline();
__ Jump(adaptor, RelocInfo::CODE_TARGET);
}
if (CallAsMethod()) {
__ bind(&wrap);
// Wrap the receiver and patch it back onto the stack.
{ FrameScope frame_scope(masm, StackFrame::INTERNAL);
__ push(rdi);
__ push(rax);
__ InvokeBuiltin(Builtins::TO_OBJECT, CALL_FUNCTION);
__ pop(rdi);
}
__ movp(args.GetReceiverOperand(), rax);
__ jmp(&cont);
}
}
void CallConstructStub::Generate(MacroAssembler* masm) {
// rax : number of arguments
// rbx : feedback vector
// rdx : (only if rbx is not the megamorphic symbol) slot in feedback
// vector (Smi)
// rdi : constructor function
Label slow, non_function_call;
// Check that function is not a smi.
__ JumpIfSmi(rdi, &non_function_call);
// Check that function is a JSFunction.
__ CmpObjectType(rdi, JS_FUNCTION_TYPE, rcx);
__ j(not_equal, &slow);
if (RecordCallTarget()) {
GenerateRecordCallTarget(masm);
}
// Jump to the function-specific construct stub.
Register jmp_reg = rcx;
__ movp(jmp_reg, FieldOperand(rdi, JSFunction::kSharedFunctionInfoOffset));
__ movp(jmp_reg, FieldOperand(jmp_reg,
SharedFunctionInfo::kConstructStubOffset));
__ lea(jmp_reg, FieldOperand(jmp_reg, Code::kHeaderSize));
__ jmp(jmp_reg);
// rdi: called object
// rax: number of arguments
// rcx: object map
Label do_call;
__ bind(&slow);
__ CmpInstanceType(rcx, JS_FUNCTION_PROXY_TYPE);
__ j(not_equal, &non_function_call);
__ GetBuiltinEntry(rdx, Builtins::CALL_FUNCTION_PROXY_AS_CONSTRUCTOR);
__ jmp(&do_call);
__ bind(&non_function_call);
__ GetBuiltinEntry(rdx, Builtins::CALL_NON_FUNCTION_AS_CONSTRUCTOR);
__ bind(&do_call);
// Set expected number of arguments to zero (not changing rax).
__ Set(rbx, 0);
__ Jump(masm->isolate()->builtins()->ArgumentsAdaptorTrampoline(),
RelocInfo::CODE_TARGET);
}
bool CEntryStub::NeedsImmovableCode() {
return false;
}
void CodeStub::GenerateStubsAheadOfTime(Isolate* isolate) {
CEntryStub::GenerateAheadOfTime(isolate);
StoreBufferOverflowStub::GenerateFixedRegStubsAheadOfTime(isolate);
StubFailureTrampolineStub::GenerateAheadOfTime(isolate);
// It is important that the store buffer overflow stubs are generated first.
ArrayConstructorStubBase::GenerateStubsAheadOfTime(isolate);
CreateAllocationSiteStub::GenerateAheadOfTime(isolate);
BinaryOpICStub::GenerateAheadOfTime(isolate);
BinaryOpICWithAllocationSiteStub::GenerateAheadOfTime(isolate);
}
void CodeStub::GenerateFPStubs(Isolate* isolate) {
}
void CEntryStub::GenerateAheadOfTime(Isolate* isolate) {
CEntryStub stub(1, kDontSaveFPRegs);
stub.GetCode(isolate);
CEntryStub save_doubles(1, kSaveFPRegs);
save_doubles.GetCode(isolate);
}
static void JumpIfOOM(MacroAssembler* masm,
Register value,
Register scratch,
Label* oom_label) {
__ movp(scratch, value);
STATIC_ASSERT(Failure::OUT_OF_MEMORY_EXCEPTION == 3);
STATIC_ASSERT(kFailureTag == 3);
__ and_(scratch, Immediate(0xf));
__ cmpq(scratch, Immediate(0xf));
__ j(equal, oom_label);
}
void CEntryStub::GenerateCore(MacroAssembler* masm,
Label* throw_normal_exception,
Label* throw_termination_exception,
Label* throw_out_of_memory_exception,
bool do_gc,
bool always_allocate_scope) {
// rax: result parameter for PerformGC, if any.
// rbx: pointer to C function (C callee-saved).
// rbp: frame pointer (restored after C call).
// rsp: stack pointer (restored after C call).
// r14: number of arguments including receiver (C callee-saved).
// r15: pointer to the first argument (C callee-saved).
// This pointer is reused in LeaveExitFrame(), so it is stored in a
// callee-saved register.
// Simple results returned in rax (both AMD64 and Win64 calling conventions).
// Complex results must be written to address passed as first argument.
// AMD64 calling convention: a struct of two pointers in rax+rdx
// Check stack alignment.
if (FLAG_debug_code) {
__ CheckStackAlignment();
}
if (do_gc) {
// Pass failure code returned from last attempt as first argument to
// PerformGC. No need to use PrepareCallCFunction/CallCFunction here as the
// stack is known to be aligned. This function takes one argument which is
// passed in register.
__ Move(arg_reg_2, ExternalReference::isolate_address(masm->isolate()));
__ movp(arg_reg_1, rax);
__ Move(kScratchRegister,
ExternalReference::perform_gc_function(masm->isolate()));
__ call(kScratchRegister);
}
ExternalReference scope_depth =
ExternalReference::heap_always_allocate_scope_depth(masm->isolate());
if (always_allocate_scope) {
Operand scope_depth_operand = masm->ExternalOperand(scope_depth);
__ incl(scope_depth_operand);
}
// Call C function.
#ifdef _WIN64
// Windows 64-bit ABI passes arguments in rcx, rdx, r8, r9.
// Pass argv and argc as two parameters. The arguments object will
// be created by stubs declared by DECLARE_RUNTIME_FUNCTION().
if (result_size_ < 2) {
// Pass a pointer to the Arguments object as the first argument.
// Return result in single register (rax).
__ movp(rcx, r14); // argc.
__ movp(rdx, r15); // argv.
__ Move(r8, ExternalReference::isolate_address(masm->isolate()));
} else {
ASSERT_EQ(2, result_size_);
// Pass a pointer to the result location as the first argument.
__ lea(rcx, StackSpaceOperand(2));
// Pass a pointer to the Arguments object as the second argument.
__ movp(rdx, r14); // argc.
__ movp(r8, r15); // argv.
__ Move(r9, ExternalReference::isolate_address(masm->isolate()));
}
#else // _WIN64
// GCC passes arguments in rdi, rsi, rdx, rcx, r8, r9.
__ movp(rdi, r14); // argc.
__ movp(rsi, r15); // argv.
__ Move(rdx, ExternalReference::isolate_address(masm->isolate()));
#endif
__ call(rbx);
// Result is in rax - do not destroy this register!
if (always_allocate_scope) {
Operand scope_depth_operand = masm->ExternalOperand(scope_depth);
__ decl(scope_depth_operand);
}
// Check for failure result.
Label failure_returned;
STATIC_ASSERT(((kFailureTag + 1) & kFailureTagMask) == 0);
#ifdef _WIN64
// If return value is on the stack, pop it to registers.
if (result_size_ > 1) {
ASSERT_EQ(2, result_size_);
// Read result values stored on stack. Result is stored
// above the four argument mirror slots and the two
// Arguments object slots.
__ movq(rax, Operand(rsp, 6 * kRegisterSize));
__ movq(rdx, Operand(rsp, 7 * kRegisterSize));
}
#endif
__ lea(rcx, Operand(rax, 1));
// Lower 2 bits of rcx are 0 iff rax has failure tag.
__ testl(rcx, Immediate(kFailureTagMask));
__ j(zero, &failure_returned);
// Exit the JavaScript to C++ exit frame.
__ LeaveExitFrame(save_doubles_);
__ ret(0);
// Handling of failure.
__ bind(&failure_returned);
Label retry;
// If the returned exception is RETRY_AFTER_GC continue at retry label
STATIC_ASSERT(Failure::RETRY_AFTER_GC == 0);
__ testl(rax, Immediate(((1 << kFailureTypeTagSize) - 1) << kFailureTagSize));
__ j(zero, &retry, Label::kNear);
// Special handling of out of memory exceptions.
JumpIfOOM(masm, rax, kScratchRegister, throw_out_of_memory_exception);
// Retrieve the pending exception.
ExternalReference pending_exception_address(
Isolate::kPendingExceptionAddress, masm->isolate());
Operand pending_exception_operand =
masm->ExternalOperand(pending_exception_address);
__ movp(rax, pending_exception_operand);
// See if we just retrieved an OOM exception.
JumpIfOOM(masm, rax, kScratchRegister, throw_out_of_memory_exception);
// Clear the pending exception.
pending_exception_operand =
masm->ExternalOperand(pending_exception_address);
__ LoadRoot(rdx, Heap::kTheHoleValueRootIndex);
__ movp(pending_exception_operand, rdx);
// Special handling of termination exceptions which are uncatchable
// by javascript code.
__ CompareRoot(rax, Heap::kTerminationExceptionRootIndex);
__ j(equal, throw_termination_exception);
// Handle normal exception.
__ jmp(throw_normal_exception);
// Retry.
__ bind(&retry);
}
void CEntryStub::Generate(MacroAssembler* masm) {
// rax: number of arguments including receiver
// rbx: pointer to C function (C callee-saved)
// rbp: frame pointer of calling JS frame (restored after C call)
// rsp: stack pointer (restored after C call)
// rsi: current context (restored)
// NOTE: Invocations of builtins may return failure objects
// instead of a proper result. The builtin entry handles
// this by performing a garbage collection and retrying the
// builtin once.
ProfileEntryHookStub::MaybeCallEntryHook(masm);
// Enter the exit frame that transitions from JavaScript to C++.
#ifdef _WIN64
int arg_stack_space = (result_size_ < 2 ? 2 : 4);
#else
int arg_stack_space = 0;
#endif
__ EnterExitFrame(arg_stack_space, save_doubles_);
// rax: Holds the context at this point, but should not be used.
// On entry to code generated by GenerateCore, it must hold
// a failure result if the collect_garbage argument to GenerateCore
// is true. This failure result can be the result of code
// generated by a previous call to GenerateCore. The value
// of rax is then passed to Runtime::PerformGC.
// rbx: pointer to builtin function (C callee-saved).
// rbp: frame pointer of exit frame (restored after C call).
// rsp: stack pointer (restored after C call).
// r14: number of arguments including receiver (C callee-saved).
// r15: argv pointer (C callee-saved).
Label throw_normal_exception;
Label throw_termination_exception;
Label throw_out_of_memory_exception;
// Call into the runtime system.
GenerateCore(masm,
&throw_normal_exception,
&throw_termination_exception,
&throw_out_of_memory_exception,
false,
false);
// Do space-specific GC and retry runtime call.
GenerateCore(masm,
&throw_normal_exception,
&throw_termination_exception,
&throw_out_of_memory_exception,
true,
false);
// Do full GC and retry runtime call one final time.
Failure* failure = Failure::InternalError();
__ Move(rax, failure, Assembler::RelocInfoNone());
GenerateCore(masm,
&throw_normal_exception,
&throw_termination_exception,
&throw_out_of_memory_exception,
true,
true);
__ bind(&throw_out_of_memory_exception);
// Set external caught exception to false.
Isolate* isolate = masm->isolate();
ExternalReference external_caught(Isolate::kExternalCaughtExceptionAddress,
isolate);
__ Set(rax, static_cast<int64_t>(false));
__ Store(external_caught, rax);
// Set pending exception and rax to out of memory exception.
ExternalReference pending_exception(Isolate::kPendingExceptionAddress,
isolate);
Label already_have_failure;
JumpIfOOM(masm, rax, kScratchRegister, &already_have_failure);
__ Move(rax, Failure::OutOfMemoryException(0x1), Assembler::RelocInfoNone());
__ bind(&already_have_failure);
__ Store(pending_exception, rax);
// Fall through to the next label.
__ bind(&throw_termination_exception);
__ ThrowUncatchable(rax);
__ bind(&throw_normal_exception);
__ Throw(rax);
}
void JSEntryStub::GenerateBody(MacroAssembler* masm, bool is_construct) {
Label invoke, handler_entry, exit;
Label not_outermost_js, not_outermost_js_2;
ProfileEntryHookStub::MaybeCallEntryHook(masm);
{ // NOLINT. Scope block confuses linter.
MacroAssembler::NoRootArrayScope uninitialized_root_register(masm);
// Set up frame.
__ push(rbp);
__ movp(rbp, rsp);
// Push the stack frame type marker twice.
int marker = is_construct ? StackFrame::ENTRY_CONSTRUCT : StackFrame::ENTRY;
// Scratch register is neither callee-save, nor an argument register on any
// platform. It's free to use at this point.
// Cannot use smi-register for loading yet.
__ Move(kScratchRegister, Smi::FromInt(marker), Assembler::RelocInfoNone());
__ push(kScratchRegister); // context slot
__ push(kScratchRegister); // function slot
// Save callee-saved registers (X64/Win64 calling conventions).
__ push(r12);
__ push(r13);
__ push(r14);
__ push(r15);
#ifdef _WIN64
__ push(rdi); // Only callee save in Win64 ABI, argument in AMD64 ABI.
__ push(rsi); // Only callee save in Win64 ABI, argument in AMD64 ABI.
#endif
__ push(rbx);
#ifdef _WIN64
// On Win64 XMM6-XMM15 are callee-save
__ subq(rsp, Immediate(EntryFrameConstants::kXMMRegistersBlockSize));
__ movdqu(Operand(rsp, EntryFrameConstants::kXMMRegisterSize * 0), xmm6);
__ movdqu(Operand(rsp, EntryFrameConstants::kXMMRegisterSize * 1), xmm7);
__ movdqu(Operand(rsp, EntryFrameConstants::kXMMRegisterSize * 2), xmm8);
__ movdqu(Operand(rsp, EntryFrameConstants::kXMMRegisterSize * 3), xmm9);
__ movdqu(Operand(rsp, EntryFrameConstants::kXMMRegisterSize * 4), xmm10);
__ movdqu(Operand(rsp, EntryFrameConstants::kXMMRegisterSize * 5), xmm11);
__ movdqu(Operand(rsp, EntryFrameConstants::kXMMRegisterSize * 6), xmm12);
__ movdqu(Operand(rsp, EntryFrameConstants::kXMMRegisterSize * 7), xmm13);
__ movdqu(Operand(rsp, EntryFrameConstants::kXMMRegisterSize * 8), xmm14);
__ movdqu(Operand(rsp, EntryFrameConstants::kXMMRegisterSize * 9), xmm15);
#endif
// Set up the roots and smi constant registers.
// Needs to be done before any further smi loads.
__ InitializeSmiConstantRegister();
__ InitializeRootRegister();
}
Isolate* isolate = masm->isolate();
// Save copies of the top frame descriptor on the stack.
ExternalReference c_entry_fp(Isolate::kCEntryFPAddress, isolate);
{
Operand c_entry_fp_operand = masm->ExternalOperand(c_entry_fp);
__ push(c_entry_fp_operand);
}
// If this is the outermost JS call, set js_entry_sp value.
ExternalReference js_entry_sp(Isolate::kJSEntrySPAddress, isolate);
__ Load(rax, js_entry_sp);
__ testq(rax, rax);
__ j(not_zero, &not_outermost_js);
__ Push(Smi::FromInt(StackFrame::OUTERMOST_JSENTRY_FRAME));
__ movp(rax, rbp);
__ Store(js_entry_sp, rax);
Label cont;
__ jmp(&cont);
__ bind(&not_outermost_js);
__ Push(Smi::FromInt(StackFrame::INNER_JSENTRY_FRAME));
__ bind(&cont);
// Jump to a faked try block that does the invoke, with a faked catch
// block that sets the pending exception.
__ jmp(&invoke);
__ 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.
ExternalReference pending_exception(Isolate::kPendingExceptionAddress,
isolate);
__ Store(pending_exception, rax);
__ Move(rax, Failure::Exception(), Assembler::RelocInfoNone());
__ jmp(&exit);
// Invoke: Link this frame into the handler chain. There's only one
// handler block in this code object, so its index is 0.
__ bind(&invoke);
__ PushTryHandler(StackHandler::JS_ENTRY, 0);
// Clear any pending exceptions.
__ LoadRoot(rax, Heap::kTheHoleValueRootIndex);
__ Store(pending_exception, rax);
// Fake a receiver (NULL).
__ push(Immediate(0)); // receiver
// Invoke the function by calling through JS entry trampoline builtin and
// pop the faked function when we return. We load the address from an
// external reference instead of inlining the call target address directly
// in the code, because the builtin stubs may not have been generated yet
// at the time this code is generated.
if (is_construct) {
ExternalReference construct_entry(Builtins::kJSConstructEntryTrampoline,
isolate);
__ Load(rax, construct_entry);
} else {
ExternalReference entry(Builtins::kJSEntryTrampoline, isolate);
__ Load(rax, entry);
}
__ lea(kScratchRegister, FieldOperand(rax, Code::kHeaderSize));
__ call(kScratchRegister);
// Unlink this frame from the handler chain.
__ PopTryHandler();
__ bind(&exit);
// Check if the current stack frame is marked as the outermost JS frame.
__ pop(rbx);
__ Cmp(rbx, Smi::FromInt(StackFrame::OUTERMOST_JSENTRY_FRAME));
__ j(not_equal, &not_outermost_js_2);
__ Move(kScratchRegister, js_entry_sp);
__ movp(Operand(kScratchRegister, 0), Immediate(0));
__ bind(&not_outermost_js_2);
// Restore the top frame descriptor from the stack.
{ Operand c_entry_fp_operand = masm->ExternalOperand(c_entry_fp);
__ pop(c_entry_fp_operand);
}
// Restore callee-saved registers (X64 conventions).
#ifdef _WIN64
// On Win64 XMM6-XMM15 are callee-save
__ movdqu(xmm6, Operand(rsp, EntryFrameConstants::kXMMRegisterSize * 0));
__ movdqu(xmm7, Operand(rsp, EntryFrameConstants::kXMMRegisterSize * 1));
__ movdqu(xmm8, Operand(rsp, EntryFrameConstants::kXMMRegisterSize * 2));
__ movdqu(xmm9, Operand(rsp, EntryFrameConstants::kXMMRegisterSize * 3));
__ movdqu(xmm10, Operand(rsp, EntryFrameConstants::kXMMRegisterSize * 4));
__ movdqu(xmm11, Operand(rsp, EntryFrameConstants::kXMMRegisterSize * 5));
__ movdqu(xmm12, Operand(rsp, EntryFrameConstants::kXMMRegisterSize * 6));
__ movdqu(xmm13, Operand(rsp, EntryFrameConstants::kXMMRegisterSize * 7));
__ movdqu(xmm14, Operand(rsp, EntryFrameConstants::kXMMRegisterSize * 8));
__ movdqu(xmm15, Operand(rsp, EntryFrameConstants::kXMMRegisterSize * 9));
__ addq(rsp, Immediate(EntryFrameConstants::kXMMRegistersBlockSize));
#endif
__ pop(rbx);
#ifdef _WIN64
// Callee save on in Win64 ABI, arguments/volatile in AMD64 ABI.
__ pop(rsi);
__ pop(rdi);
#endif
__ pop(r15);
__ pop(r14);
__ pop(r13);
__ pop(r12);
__ addq(rsp, Immediate(2 * kPointerSize)); // remove markers
// Restore frame pointer and return.
__ pop(rbp);
__ ret(0);
}
void InstanceofStub::Generate(MacroAssembler* masm) {
// Implements "value instanceof function" operator.
// Expected input state with no inline cache:
// rsp[0] : return address
// rsp[8] : function pointer
// rsp[16] : value
// Expected input state with an inline one-element cache:
// rsp[0] : return address
// rsp[8] : offset from return address to location of inline cache
// rsp[16] : function pointer
// rsp[24] : value
// Returns a bitwise zero to indicate that the value
// is and instance of the function and anything else to
// indicate that the value is not an instance.
static const int kOffsetToMapCheckValue = 2;
static const int kOffsetToResultValue = 18;
// The last 4 bytes of the instruction sequence
// movq(rdi, FieldOperand(rax, HeapObject::kMapOffset))
// Move(kScratchRegister, Factory::the_hole_value())
// in front of the hole value address.
static const unsigned int kWordBeforeMapCheckValue = 0xBA49FF78;
// The last 4 bytes of the instruction sequence
// __ j(not_equal, &cache_miss);
// __ LoadRoot(ToRegister(instr->result()), Heap::kTheHoleValueRootIndex);
// before the offset of the hole value in the root array.
static const unsigned int kWordBeforeResultValue = 0x458B4906;
// Only the inline check flag is supported on X64.
ASSERT(flags_ == kNoFlags || HasCallSiteInlineCheck());
int extra_argument_offset = HasCallSiteInlineCheck() ? 1 : 0;
// Get the object - go slow case if it's a smi.
Label slow;
StackArgumentsAccessor args(rsp, 2 + extra_argument_offset,
ARGUMENTS_DONT_CONTAIN_RECEIVER);
__ movp(rax, args.GetArgumentOperand(0));
__ JumpIfSmi(rax, &slow);
// Check that the left hand is a JS object. Leave its map in rax.
__ CmpObjectType(rax, FIRST_SPEC_OBJECT_TYPE, rax);
__ j(below, &slow);
__ CmpInstanceType(rax, LAST_SPEC_OBJECT_TYPE);
__ j(above, &slow);
// Get the prototype of the function.
__ movp(rdx, args.GetArgumentOperand(1));
// rdx is function, rax is map.
// If there is a call site cache don't look in the global cache, but do the
// real lookup and update the call site cache.
if (!HasCallSiteInlineCheck()) {
// Look up the function and the map in the instanceof cache.
Label miss;
__ CompareRoot(rdx, Heap::kInstanceofCacheFunctionRootIndex);
__ j(not_equal, &miss, Label::kNear);
__ CompareRoot(rax, Heap::kInstanceofCacheMapRootIndex);
__ j(not_equal, &miss, Label::kNear);
__ LoadRoot(rax, Heap::kInstanceofCacheAnswerRootIndex);
__ ret(2 * kPointerSize);
__ bind(&miss);
}
__ TryGetFunctionPrototype(rdx, rbx, &slow, true);
// Check that the function prototype is a JS object.
__ JumpIfSmi(rbx, &slow);
__ CmpObjectType(rbx, FIRST_SPEC_OBJECT_TYPE, kScratchRegister);
__ j(below, &slow);
__ CmpInstanceType(kScratchRegister, LAST_SPEC_OBJECT_TYPE);
__ j(above, &slow);
// Register mapping:
// rax is object map.
// rdx is function.
// rbx is function prototype.
if (!HasCallSiteInlineCheck()) {
__ StoreRoot(rdx, Heap::kInstanceofCacheFunctionRootIndex);
__ StoreRoot(rax, Heap::kInstanceofCacheMapRootIndex);
} else {
// Get return address and delta to inlined map check.
__ movq(kScratchRegister, StackOperandForReturnAddress(0));
__ subq(kScratchRegister, args.GetArgumentOperand(2));
if (FLAG_debug_code) {
__ movl(rdi, Immediate(kWordBeforeMapCheckValue));
__ cmpl(Operand(kScratchRegister, kOffsetToMapCheckValue - 4), rdi);
__ Assert(equal, kInstanceofStubUnexpectedCallSiteCacheCheck);
}
__ movp(kScratchRegister,
Operand(kScratchRegister, kOffsetToMapCheckValue));
__ movp(Operand(kScratchRegister, 0), rax);
}
__ movp(rcx, FieldOperand(rax, Map::kPrototypeOffset));
// Loop through the prototype chain looking for the function prototype.
Label loop, is_instance, is_not_instance;
__ LoadRoot(kScratchRegister, Heap::kNullValueRootIndex);
__ bind(&loop);
__ cmpq(rcx, rbx);
__ j(equal, &is_instance, Label::kNear);
__ cmpq(rcx, kScratchRegister);
// The code at is_not_instance assumes that kScratchRegister contains a
// non-zero GCable value (the null object in this case).
__ j(equal, &is_not_instance, Label::kNear);
__ movp(rcx, FieldOperand(rcx, HeapObject::kMapOffset));
__ movp(rcx, FieldOperand(rcx, Map::kPrototypeOffset));
__ jmp(&loop);
__ bind(&is_instance);
if (!HasCallSiteInlineCheck()) {
__ xorl(rax, rax);
// Store bitwise zero in the cache. This is a Smi in GC terms.
STATIC_ASSERT(kSmiTag == 0);
__ StoreRoot(rax, Heap::kInstanceofCacheAnswerRootIndex);
} else {
// Store offset of true in the root array at the inline check site.
int true_offset = 0x100 +
(Heap::kTrueValueRootIndex << kPointerSizeLog2) - kRootRegisterBias;
// Assert it is a 1-byte signed value.
ASSERT(true_offset >= 0 && true_offset < 0x100);
__ movl(rax, Immediate(true_offset));
__ movq(kScratchRegister, StackOperandForReturnAddress(0));
__ subq(kScratchRegister, args.GetArgumentOperand(2));
__ movb(Operand(kScratchRegister, kOffsetToResultValue), rax);
if (FLAG_debug_code) {
__ movl(rax, Immediate(kWordBeforeResultValue));
__ cmpl(Operand(kScratchRegister, kOffsetToResultValue - 4), rax);
__ Assert(equal, kInstanceofStubUnexpectedCallSiteCacheMov);
}
__ Set(rax, 0);
}
__ ret((2 + extra_argument_offset) * kPointerSize);
__ bind(&is_not_instance);
if (!HasCallSiteInlineCheck()) {
// We have to store a non-zero value in the cache.
__ StoreRoot(kScratchRegister, Heap::kInstanceofCacheAnswerRootIndex);
} else {
// Store offset of false in the root array at the inline check site.
int false_offset = 0x100 +
(Heap::kFalseValueRootIndex << kPointerSizeLog2) - kRootRegisterBias;
// Assert it is a 1-byte signed value.
ASSERT(false_offset >= 0 && false_offset < 0x100);
__ movl(rax, Immediate(false_offset));
__ movq(kScratchRegister, StackOperandForReturnAddress(0));
__ subq(kScratchRegister, args.GetArgumentOperand(2));
__ movb(Operand(kScratchRegister, kOffsetToResultValue), rax);
if (FLAG_debug_code) {
__ movl(rax, Immediate(kWordBeforeResultValue));
__ cmpl(Operand(kScratchRegister, kOffsetToResultValue - 4), rax);
__ Assert(equal, kInstanceofStubUnexpectedCallSiteCacheMov);
}
}
__ ret((2 + extra_argument_offset) * kPointerSize);
// Slow-case: Go through the JavaScript implementation.
__ bind(&slow);
if (HasCallSiteInlineCheck()) {
// Remove extra value from the stack.
__ PopReturnAddressTo(rcx);
__ pop(rax);
__ PushReturnAddressFrom(rcx);
}
__ InvokeBuiltin(Builtins::INSTANCE_OF, JUMP_FUNCTION);
}
// Passing arguments in registers is not supported.
Register InstanceofStub::left() { return no_reg; }
Register InstanceofStub::right() { return no_reg; }
// -------------------------------------------------------------------------
// StringCharCodeAtGenerator
void StringCharCodeAtGenerator::GenerateFast(MacroAssembler* masm) {
Label flat_string;
Label ascii_string;
Label got_char_code;
Label sliced_string;
// If the receiver is a smi trigger the non-string case.
__ JumpIfSmi(object_, receiver_not_string_);
// Fetch the instance type of the receiver into result register.
__ movp(result_, FieldOperand(object_, HeapObject::kMapOffset));
__ movzxbl(result_, FieldOperand(result_, Map::kInstanceTypeOffset));
// If the receiver is not a string trigger the non-string case.
__ testb(result_, Immediate(kIsNotStringMask));
__ j(not_zero, 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.
__ SmiCompare(index_, FieldOperand(object_, String::kLengthOffset));
__ j(above_equal, index_out_of_range_);
__ SmiToInteger32(index_, index_);
StringCharLoadGenerator::Generate(
masm, object_, index_, result_, &call_runtime_);
__ Integer32ToSmi(result_, result_);
__ bind(&exit_);
}
void StringCharCodeAtGenerator::GenerateSlow(
MacroAssembler* masm,
const RuntimeCallHelper& call_helper) {
__ Abort(kUnexpectedFallthroughToCharCodeAtSlowCase);
Factory* factory = masm->isolate()->factory();
// Index is not a smi.
__ bind(&index_not_smi_);
// If index is a heap number, try converting it to an integer.
__ CheckMap(index_,
factory->heap_number_map(),
index_not_number_,
DONT_DO_SMI_CHECK);
call_helper.BeforeCall(masm);
__ push(object_);
__ push(index_); // Consumed by runtime conversion function.
if (index_flags_ == STRING_INDEX_IS_NUMBER) {
__ CallRuntime(Runtime::kNumberToIntegerMapMinusZero, 1);
} else {
ASSERT(index_flags_ == STRING_INDEX_IS_ARRAY_INDEX);
// NumberToSmi discards numbers that are not exact integers.
__ CallRuntime(Runtime::kNumberToSmi, 1);
}
if (!index_.is(rax)) {
// Save the conversion result before the pop instructions below
// have a chance to overwrite it.
__ movp(index_, rax);
}
__ pop(object_);
// Reload the instance type.
__ movp(result_, FieldOperand(object_, HeapObject::kMapOffset));
__ movzxbl(result_, FieldOperand(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.
__ jmp(&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);
__ push(object_);
__ Integer32ToSmi(index_, index_);
__ push(index_);
__ CallRuntime(Runtime::kStringCharCodeAt, 2);
if (!result_.is(rax)) {
__ movp(result_, rax);
}
call_helper.AfterCall(masm);
__ jmp(&exit_);
__ Abort(kUnexpectedFallthroughFromCharCodeAtSlowCase);
}
// -------------------------------------------------------------------------
// StringCharFromCodeGenerator
void StringCharFromCodeGenerator::GenerateFast(MacroAssembler* masm) {
// Fast case of Heap::LookupSingleCharacterStringFromCode.
__ JumpIfNotSmi(code_, &slow_case_);
__ SmiCompare(code_, Smi::FromInt(String::kMaxOneByteCharCode));
__ j(above, &slow_case_);
__ LoadRoot(result_, Heap::kSingleCharacterStringCacheRootIndex);
SmiIndex index = masm->SmiToIndex(kScratchRegister, code_, kPointerSizeLog2);
__ movp(result_, FieldOperand(result_, index.reg, index.scale,
FixedArray::kHeaderSize));
__ CompareRoot(result_, Heap::kUndefinedValueRootIndex);
__ j(equal, &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::kCharFromCode, 1);
if (!result_.is(rax)) {
__ movp(result_, rax);
}
call_helper.AfterCall(masm);
__ jmp(&exit_);
__ Abort(kUnexpectedFallthroughFromCharFromCodeSlowCase);
}
void StringHelper::GenerateCopyCharactersREP(MacroAssembler* masm,
Register dest,
Register src,
Register count,
bool ascii) {
// Copy characters using rep movs of doublewords. Align destination on 4 byte
// boundary before starting rep movs. Copy remaining characters after running
// rep movs.
// Count is positive int32, dest and src are character pointers.
ASSERT(dest.is(rdi)); // rep movs destination
ASSERT(src.is(rsi)); // rep movs source
ASSERT(count.is(rcx)); // rep movs count
// Nothing to do for zero characters.
Label done;
__ testl(count, count);
__ j(zero, &done, Label::kNear);
// Make count the number of bytes to copy.
if (!ascii) {
STATIC_ASSERT(2 == sizeof(uc16));
__ addl(count, count);
}
// Don't enter the rep movs if there are less than 4 bytes to copy.
Label last_bytes;
__ testl(count, Immediate(~(kPointerSize - 1)));
__ j(zero, &last_bytes, Label::kNear);
// Copy from edi to esi using rep movs instruction.
__ movl(kScratchRegister, count);
__ shr(count, Immediate(kPointerSizeLog2)); // Number of doublewords to copy.
__ repmovsq();
// Find number of bytes left.
__ movl(count, kScratchRegister);
__ and_(count, Immediate(kPointerSize - 1));
// Check if there are more bytes to copy.
__ bind(&last_bytes);
__ testl(count, count);
__ j(zero, &done, Label::kNear);
// Copy remaining characters.
Label loop;
__ bind(&loop);
__ movb(kScratchRegister, Operand(src, 0));
__ movb(Operand(dest, 0), kScratchRegister);
__ incq(src);
__ incq(dest);
__ decl(count);
__ j(not_zero, &loop);
__ bind(&done);
}
void StringHelper::GenerateHashInit(MacroAssembler* masm,
Register hash,
Register character,
Register scratch) {
// hash = (seed + character) + ((seed + character) << 10);
__ LoadRoot(scratch, Heap::kHashSeedRootIndex);
__ SmiToInteger32(scratch, scratch);
__ addl(scratch, character);
__ movl(hash, scratch);
__ shll(scratch, Immediate(10));
__ addl(hash, scratch);
// hash ^= hash >> 6;
__ movl(scratch, hash);
__ shrl(scratch, Immediate(6));
__ xorl(hash, scratch);
}
void StringHelper::GenerateHashAddCharacter(MacroAssembler* masm,
Register hash,
Register character,
Register scratch) {
// hash += character;
__ addl(hash, character);
// hash += hash << 10;
__ movl(scratch, hash);
__ shll(scratch, Immediate(10));
__ addl(hash, scratch);
// hash ^= hash >> 6;
__ movl(scratch, hash);
__ shrl(scratch, Immediate(6));
__ xorl(hash, scratch);
}
void StringHelper::GenerateHashGetHash(MacroAssembler* masm,
Register hash,
Register scratch) {
// hash += hash << 3;
__ leal(hash, Operand(hash, hash, times_8, 0));
// hash ^= hash >> 11;
__ movl(scratch, hash);
__ shrl(scratch, Immediate(11));
__ xorl(hash, scratch);
// hash += hash << 15;
__ movl(scratch, hash);
__ shll(scratch, Immediate(15));
__ addl(hash, scratch);
__ andl(hash, Immediate(String::kHashBitMask));
// if (hash == 0) hash = 27;
Label hash_not_zero;
__ j(not_zero, &hash_not_zero);
__ Set(hash, StringHasher::kZeroHash);
__ bind(&hash_not_zero);
}
void SubStringStub::Generate(MacroAssembler* masm) {
Label runtime;
// Stack frame on entry.
// rsp[0] : return address
// rsp[8] : to
// rsp[16] : from
// rsp[24] : string
enum SubStringStubArgumentIndices {
STRING_ARGUMENT_INDEX,
FROM_ARGUMENT_INDEX,
TO_ARGUMENT_INDEX,
SUB_STRING_ARGUMENT_COUNT
};
StackArgumentsAccessor args(rsp, SUB_STRING_ARGUMENT_COUNT,
ARGUMENTS_DONT_CONTAIN_RECEIVER);
// Make sure first argument is a string.
__ movp(rax, args.GetArgumentOperand(STRING_ARGUMENT_INDEX));
STATIC_ASSERT(kSmiTag == 0);
__ testl(rax, Immediate(kSmiTagMask));
__ j(zero, &runtime);
Condition is_string = masm->IsObjectStringType(rax, rbx, rbx);
__ j(NegateCondition(is_string), &runtime);
// rax: string
// rbx: instance type
// Calculate length of sub string using the smi values.
__ movp(rcx, args.GetArgumentOperand(TO_ARGUMENT_INDEX));
__ movp(rdx, args.GetArgumentOperand(FROM_ARGUMENT_INDEX));
__ JumpUnlessBothNonNegativeSmi(rcx, rdx, &runtime);
__ SmiSub(rcx, rcx, rdx); // Overflow doesn't happen.
__ cmpq(rcx, FieldOperand(rax, String::kLengthOffset));
Label not_original_string;
// Shorter than original string's length: an actual substring.
__ j(below, &not_original_string, Label::kNear);
// Longer than original string's length or negative: unsafe arguments.
__ j(above, &runtime);
// Return original string.
Counters* counters = masm->isolate()->counters();
__ IncrementCounter(counters->sub_string_native(), 1);
__ ret(SUB_STRING_ARGUMENT_COUNT * kPointerSize);
__ bind(&not_original_string);
Label single_char;
__ SmiCompare(rcx, Smi::FromInt(1));
__ j(equal, &single_char);
__ SmiToInteger32(rcx, rcx);
// rax: string
// rbx: instance type
// rcx: sub string length
// rdx: from index (smi)
// Deal with different string types: update the index if necessary
// and put the underlying string into edi.
Label underlying_unpacked, sliced_string, seq_or_external_string;
// If the string is not indirect, it can only be sequential or external.
STATIC_ASSERT(kIsIndirectStringMask == (kSlicedStringTag & kConsStringTag));
STATIC_ASSERT(kIsIndirectStringMask != 0);
__ testb(rbx, Immediate(kIsIndirectStringMask));
__ j(zero, &seq_or_external_string, Label::kNear);
__ testb(rbx, Immediate(kSlicedNotConsMask));
__ j(not_zero, &sliced_string, Label::kNear);
// Cons string. Check whether it is flat, then fetch first part.
// Flat cons strings have an empty second part.
__ CompareRoot(FieldOperand(rax, ConsString::kSecondOffset),
Heap::kempty_stringRootIndex);
__ j(not_equal, &runtime);
__ movp(rdi, FieldOperand(rax, ConsString::kFirstOffset));
// Update instance type.
__ movp(rbx, FieldOperand(rdi, HeapObject::kMapOffset));
__ movzxbl(rbx, FieldOperand(rbx, Map::kInstanceTypeOffset));
__ jmp(&underlying_unpacked, Label::kNear);
__ bind(&sliced_string);
// Sliced string. Fetch parent and correct start index by offset.
__ addq(rdx, FieldOperand(rax, SlicedString::kOffsetOffset));
__ movp(rdi, FieldOperand(rax, SlicedString::kParentOffset));
// Update instance type.
__ movp(rbx, FieldOperand(rdi, HeapObject::kMapOffset));
__ movzxbl(rbx, FieldOperand(rbx, Map::kInstanceTypeOffset));
__ jmp(&underlying_unpacked, Label::kNear);
__ bind(&seq_or_external_string);
// Sequential or external string. Just move string to the correct register.
__ movp(rdi, rax);
__ bind(&underlying_unpacked);
if (FLAG_string_slices) {
Label copy_routine;
// rdi: underlying subject string
// rbx: instance type of underlying subject string
// rdx: adjusted start index (smi)
// rcx: length
// If coming from the make_two_character_string path, the string
// is too short to be sliced anyways.
__ cmpq(rcx, Immediate(SlicedString::kMinLength));
// Short slice. Copy instead of slicing.
__ j(less, &copy_routine);
// Allocate new sliced string. At this point we do not reload the instance
// type including the string encoding because we simply rely on the info
// provided by the original string. It does not matter if the original
// string's encoding is wrong because we always have to recheck encoding of
// the newly created string's parent anyways due to externalized strings.
Label two_byte_slice, set_slice_header;
STATIC_ASSERT((kStringEncodingMask & kOneByteStringTag) != 0);
STATIC_ASSERT((kStringEncodingMask & kTwoByteStringTag) == 0);
__ testb(rbx, Immediate(kStringEncodingMask));
__ j(zero, &two_byte_slice, Label::kNear);
__ AllocateAsciiSlicedString(rax, rbx, r14, &runtime);
__ jmp(&set_slice_header, Label::kNear);
__ bind(&two_byte_slice);
__ AllocateTwoByteSlicedString(rax, rbx, r14, &runtime);
__ bind(&set_slice_header);
__ Integer32ToSmi(rcx, rcx);
__ movp(FieldOperand(rax, SlicedString::kLengthOffset), rcx);
__ movp(FieldOperand(rax, SlicedString::kHashFieldOffset),
Immediate(String::kEmptyHashField));
__ movp(FieldOperand(rax, SlicedString::kParentOffset), rdi);
__ movp(FieldOperand(rax, SlicedString::kOffsetOffset), rdx);
__ IncrementCounter(counters->sub_string_native(), 1);
__ ret(3 * kPointerSize);
__ bind(&copy_routine);
}
// rdi: underlying subject string
// rbx: instance type of underlying subject string
// rdx: adjusted start index (smi)
// rcx: length
// The subject string can only be external or sequential string of either
// encoding at this point.
Label two_byte_sequential, sequential_string;
STATIC_ASSERT(kExternalStringTag != 0);
STATIC_ASSERT(kSeqStringTag == 0);
__ testb(rbx, Immediate(kExternalStringTag));
__ j(zero, &sequential_string);
// Handle external string.
// Rule out short external strings.
STATIC_CHECK(kShortExternalStringTag != 0);
__ testb(rbx, Immediate(kShortExternalStringMask));
__ j(not_zero, &runtime);
__ movp(rdi, FieldOperand(rdi, ExternalString::kResourceDataOffset));
// Move the pointer so that offset-wise, it looks like a sequential string.
STATIC_ASSERT(SeqTwoByteString::kHeaderSize == SeqOneByteString::kHeaderSize);
__ subq(rdi, Immediate(SeqTwoByteString::kHeaderSize - kHeapObjectTag));
__ bind(&sequential_string);
STATIC_ASSERT((kOneByteStringTag & kStringEncodingMask) != 0);
__ testb(rbx, Immediate(kStringEncodingMask));
__ j(zero, &two_byte_sequential);
// Allocate the result.
__ AllocateAsciiString(rax, rcx, r11, r14, r15, &runtime);
// rax: result string
// rcx: result string length
__ movp(r14, rsi); // esi used by following code.
{ // Locate character of sub string start.
SmiIndex smi_as_index = masm->SmiToIndex(rdx, rdx, times_1);
__ lea(rsi, Operand(rdi, smi_as_index.reg, smi_as_index.scale,
SeqOneByteString::kHeaderSize - kHeapObjectTag));
}
// Locate first character of result.
__ lea(rdi, FieldOperand(rax, SeqOneByteString::kHeaderSize));
// rax: result string
// rcx: result length
// rdi: first character of result
// rsi: character of sub string start
// r14: original value of rsi
StringHelper::GenerateCopyCharactersREP(masm, rdi, rsi, rcx, true);
__ movp(rsi, r14); // Restore rsi.
__ IncrementCounter(counters->sub_string_native(), 1);
__ ret(SUB_STRING_ARGUMENT_COUNT * kPointerSize);
__ bind(&two_byte_sequential);
// Allocate the result.
__ AllocateTwoByteString(rax, rcx, r11, r14, r15, &runtime);
// rax: result string
// rcx: result string length
__ movp(r14, rsi); // esi used by following code.
{ // Locate character of sub string start.
SmiIndex smi_as_index = masm->SmiToIndex(rdx, rdx, times_2);
__ lea(rsi, Operand(rdi, smi_as_index.reg, smi_as_index.scale,
SeqOneByteString::kHeaderSize - kHeapObjectTag));
}
// Locate first character of result.
__ lea(rdi, FieldOperand(rax, SeqTwoByteString::kHeaderSize));
// rax: result string
// rcx: result length
// rdi: first character of result
// rsi: character of sub string start
// r14: original value of rsi
StringHelper::GenerateCopyCharactersREP(masm, rdi, rsi, rcx, false);
__ movp(rsi, r14); // Restore esi.
__ IncrementCounter(counters->sub_string_native(), 1);
__ ret(SUB_STRING_ARGUMENT_COUNT * kPointerSize);
// Just jump to runtime to create the sub string.
__ bind(&runtime);
__ TailCallRuntime(Runtime::kSubString, 3, 1);
__ bind(&single_char);
// rax: string
// rbx: instance type
// rcx: sub string length (smi)
// rdx: from index (smi)
StringCharAtGenerator generator(
rax, rdx, rcx, rax, &runtime, &runtime, &runtime, STRING_INDEX_IS_NUMBER);
generator.GenerateFast(masm);
__ ret(SUB_STRING_ARGUMENT_COUNT * kPointerSize);
generator.SkipSlow(masm, &runtime);
}
void StringCompareStub::GenerateFlatAsciiStringEquals(MacroAssembler* masm,
Register left,
Register right,
Register scratch1,
Register scratch2) {
Register length = scratch1;
// Compare lengths.
Label check_zero_length;
__ movp(length, FieldOperand(left, String::kLengthOffset));
__ SmiCompare(length, FieldOperand(right, String::kLengthOffset));
__ j(equal, &check_zero_length, Label::kNear);
__ Move(rax, Smi::FromInt(NOT_EQUAL));
__ ret(0);
// Check if the length is zero.
Label compare_chars;
__ bind(&check_zero_length);
STATIC_ASSERT(kSmiTag == 0);
__ SmiTest(length);
__ j(not_zero, &compare_chars, Label::kNear);
__ Move(rax, Smi::FromInt(EQUAL));
__ ret(0);
// Compare characters.
__ bind(&compare_chars);
Label strings_not_equal;
GenerateAsciiCharsCompareLoop(masm, left, right, length, scratch2,
&strings_not_equal, Label::kNear);
// Characters are equal.
__ Move(rax, Smi::FromInt(EQUAL));
__ ret(0);
// Characters are not equal.
__ bind(&strings_not_equal);
__ Move(rax, Smi::FromInt(NOT_EQUAL));
__ ret(0);
}
void StringCompareStub::GenerateCompareFlatAsciiStrings(MacroAssembler* masm,
Register left,
Register right,
Register scratch1,
Register scratch2,
Register scratch3,
Register scratch4) {
// Ensure that you can always subtract a string length from a non-negative
// number (e.g. another length).
STATIC_ASSERT(String::kMaxLength < 0x7fffffff);
// Find minimum length and length difference.
__ movp(scratch1, FieldOperand(left, String::kLengthOffset));
__ movp(scratch4, scratch1);
__ SmiSub(scratch4,
scratch4,
FieldOperand(right, String::kLengthOffset));
// Register scratch4 now holds left.length - right.length.
const Register length_difference = scratch4;
Label left_shorter;
__ j(less, &left_shorter, Label::kNear);
// The right string isn't longer that the left one.
// Get the right string's length by subtracting the (non-negative) difference
// from the left string's length.
__ SmiSub(scratch1, scratch1, length_difference);
__ bind(&left_shorter);
// Register scratch1 now holds Min(left.length, right.length).
const Register min_length = scratch1;
Label compare_lengths;
// If min-length is zero, go directly to comparing lengths.
__ SmiTest(min_length);
__ j(zero, &compare_lengths, Label::kNear);
// Compare loop.
Label result_not_equal;
GenerateAsciiCharsCompareLoop(masm, left, right, min_length, scratch2,
&result_not_equal,
// In debug-code mode, SmiTest below might push
// the target label outside the near range.
Label::kFar);
// Completed loop without finding different characters.
// Compare lengths (precomputed).
__ bind(&compare_lengths);
__ SmiTest(length_difference);
Label length_not_equal;
__ j(not_zero, &length_not_equal, Label::kNear);
// Result is EQUAL.
__ Move(rax, Smi::FromInt(EQUAL));
__ ret(0);
Label result_greater;
Label result_less;
__ bind(&length_not_equal);
__ j(greater, &result_greater, Label::kNear);
__ jmp(&result_less, Label::kNear);
__ bind(&result_not_equal);
// Unequal comparison of left to right, either character or length.
__ j(above, &result_greater, Label::kNear);
__ bind(&result_less);
// Result is LESS.
__ Move(rax, Smi::FromInt(LESS));
__ ret(0);
// Result is GREATER.
__ bind(&result_greater);
__ Move(rax, Smi::FromInt(GREATER));
__ ret(0);
}
void StringCompareStub::GenerateAsciiCharsCompareLoop(
MacroAssembler* masm,
Register left,
Register right,
Register length,
Register scratch,
Label* chars_not_equal,
Label::Distance near_jump) {
// 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.
__ SmiToInteger32(length, length);
__ lea(left,
FieldOperand(left, length, times_1, SeqOneByteString::kHeaderSize));
__ lea(right,
FieldOperand(right, length, times_1, SeqOneByteString::kHeaderSize));
__ neg(length);
Register index = length; // index = -length;
// Compare loop.
Label loop;
__ bind(&loop);
__ movb(scratch, Operand(left, index, times_1, 0));
__ cmpb(scratch, Operand(right, index, times_1, 0));
__ j(not_equal, chars_not_equal, near_jump);
__ incq(index);
__ j(not_zero, &loop);
}
void StringCompareStub::Generate(MacroAssembler* masm) {
Label runtime;
// Stack frame on entry.
// rsp[0] : return address
// rsp[8] : right string
// rsp[16] : left string
StackArgumentsAccessor args(rsp, 2, ARGUMENTS_DONT_CONTAIN_RECEIVER);
__ movp(rdx, args.GetArgumentOperand(0)); // left
__ movp(rax, args.GetArgumentOperand(1)); // right
// Check for identity.
Label not_same;
__ cmpq(rdx, rax);
__ j(not_equal, &not_same, Label::kNear);
__ Move(rax, Smi::FromInt(EQUAL));
Counters* counters = masm->isolate()->counters();
__ IncrementCounter(counters->string_compare_native(), 1);
__ ret(2 * kPointerSize);
__ bind(&not_same);
// Check that both are sequential ASCII strings.
__ JumpIfNotBothSequentialAsciiStrings(rdx, rax, rcx, rbx, &runtime);
// Inline comparison of ASCII strings.
__ IncrementCounter(counters->string_compare_native(), 1);
// Drop arguments from the stack
__ PopReturnAddressTo(rcx);
__ addq(rsp, Immediate(2 * kPointerSize));
__ PushReturnAddressFrom(rcx);
GenerateCompareFlatAsciiStrings(masm, rdx, rax, rcx, rbx, rdi, r8);
// Call the runtime; it returns -1 (less), 0 (equal), or 1 (greater)
// tagged as a small integer.
__ bind(&runtime);
__ TailCallRuntime(Runtime::kStringCompare, 2, 1);
}
void ArrayPushStub::Generate(MacroAssembler* masm) {
int argc = arguments_count();
StackArgumentsAccessor args(rsp, argc);
if (argc == 0) {
// Noop, return the length.
__ movp(rax, FieldOperand(rdx, JSArray::kLengthOffset));
__ ret((argc + 1) * kPointerSize);
return;
}
Isolate* isolate = masm->isolate();
if (argc != 1) {
__ TailCallExternalReference(
ExternalReference(Builtins::c_ArrayPush, isolate), argc + 1, 1);
return;
}
Label call_builtin, attempt_to_grow_elements, with_write_barrier;
// Get the elements array of the object.
__ movp(rdi, FieldOperand(rdx, JSArray::kElementsOffset));
if (IsFastSmiOrObjectElementsKind(elements_kind())) {
// Check that the elements are in fast mode and writable.
__ Cmp(FieldOperand(rdi, HeapObject::kMapOffset),
isolate->factory()->fixed_array_map());
__ j(not_equal, &call_builtin);
}
// Get the array's length into rax and calculate new length.
__ SmiToInteger32(rax, FieldOperand(rdx, JSArray::kLengthOffset));
STATIC_ASSERT(FixedArray::kMaxLength < Smi::kMaxValue);
__ addl(rax, Immediate(argc));
// Get the elements' length into rcx.
__ SmiToInteger32(rcx, FieldOperand(rdi, FixedArray::kLengthOffset));
// Check if we could survive without allocation.
__ cmpl(rax, rcx);
if (IsFastSmiOrObjectElementsKind(elements_kind())) {
__ j(greater, &attempt_to_grow_elements);
// Check if value is a smi.
__ movp(rcx, args.GetArgumentOperand(1));
__ JumpIfNotSmi(rcx, &with_write_barrier);
// Store the value.
__ movp(FieldOperand(rdi,
rax,
times_pointer_size,
FixedArray::kHeaderSize - argc * kPointerSize),
rcx);
} else {
__ j(greater, &call_builtin);
__ movp(rcx, args.GetArgumentOperand(1));
__ StoreNumberToDoubleElements(
rcx, rdi, rax, xmm0, &call_builtin, argc * kDoubleSize);
}
// Save new length.
__ Integer32ToSmiField(FieldOperand(rdx, JSArray::kLengthOffset), rax);
__ Integer32ToSmi(rax, rax); // Return new length as smi.
__ ret((argc + 1) * kPointerSize);
if (IsFastDoubleElementsKind(elements_kind())) {
__ bind(&call_builtin);
__ TailCallExternalReference(
ExternalReference(Builtins::c_ArrayPush, isolate), argc + 1, 1);
return;
}
__ bind(&with_write_barrier);
if (IsFastSmiElementsKind(elements_kind())) {
if (FLAG_trace_elements_transitions) __ jmp(&call_builtin);
__ Cmp(FieldOperand(rcx, HeapObject::kMapOffset),
isolate->factory()->heap_number_map());
__ j(equal, &call_builtin);
ElementsKind target_kind = IsHoleyElementsKind(elements_kind())
? FAST_HOLEY_ELEMENTS : FAST_ELEMENTS;
__ movp(rbx, ContextOperand(rsi, Context::GLOBAL_OBJECT_INDEX));
__ movp(rbx, FieldOperand(rbx, GlobalObject::kNativeContextOffset));
__ movp(rbx, ContextOperand(rbx, Context::JS_ARRAY_MAPS_INDEX));
const int header_size = FixedArrayBase::kHeaderSize;
// Verify that the object can be transitioned in place.
const int origin_offset = header_size + elements_kind() * kPointerSize;
__ movp(rdi, FieldOperand(rbx, origin_offset));
__ cmpq(rdi, FieldOperand(rdx, HeapObject::kMapOffset));
__ j(not_equal, &call_builtin);
const int target_offset = header_size + target_kind * kPointerSize;
__ movp(rbx, FieldOperand(rbx, target_offset));
ElementsTransitionGenerator::GenerateMapChangeElementsTransition(
masm, DONT_TRACK_ALLOCATION_SITE, NULL);
__ movp(rdi, FieldOperand(rdx, JSArray::kElementsOffset));
}
// Save new length.
__ Integer32ToSmiField(FieldOperand(rdx, JSArray::kLengthOffset), rax);
// Store the value.
__ lea(rdx, FieldOperand(rdi,
rax, times_pointer_size,
FixedArray::kHeaderSize - argc * kPointerSize));
__ movp(Operand(rdx, 0), rcx);
__ RecordWrite(rdi, rdx, rcx, kDontSaveFPRegs, EMIT_REMEMBERED_SET,
OMIT_SMI_CHECK);
__ Integer32ToSmi(rax, rax); // Return new length as smi.
__ ret((argc + 1) * kPointerSize);
__ bind(&attempt_to_grow_elements);
if (!FLAG_inline_new) {
__ bind(&call_builtin);
__ TailCallExternalReference(
ExternalReference(Builtins::c_ArrayPush, isolate), argc + 1, 1);
return;
}
__ movp(rbx, args.GetArgumentOperand(1));
// Growing elements that are SMI-only requires special handling in case the
// new element is non-Smi. For now, delegate to the builtin.
Label no_fast_elements_check;
__ JumpIfSmi(rbx, &no_fast_elements_check);
__ movp(rcx, FieldOperand(rdx, HeapObject::kMapOffset));
__ CheckFastObjectElements(rcx, &call_builtin, Label::kFar);
__ bind(&no_fast_elements_check);
ExternalReference new_space_allocation_top =
ExternalReference::new_space_allocation_top_address(isolate);
ExternalReference new_space_allocation_limit =
ExternalReference::new_space_allocation_limit_address(isolate);
const int kAllocationDelta = 4;
ASSERT(kAllocationDelta >= argc);
// Load top.
__ Load(rcx, new_space_allocation_top);
// Check if it's the end of elements.
__ lea(rdx, FieldOperand(rdi,
rax, times_pointer_size,
FixedArray::kHeaderSize - argc * kPointerSize));
__ cmpq(rdx, rcx);
__ j(not_equal, &call_builtin);
__ addq(rcx, Immediate(kAllocationDelta * kPointerSize));
Operand limit_operand = masm->ExternalOperand(new_space_allocation_limit);
__ cmpq(rcx, limit_operand);
__ j(above, &call_builtin);
// We fit and could grow elements.
__ Store(new_space_allocation_top, rcx);
// Push the argument...
__ movp(Operand(rdx, 0), rbx);
// ... and fill the rest with holes.
__ LoadRoot(kScratchRegister, Heap::kTheHoleValueRootIndex);
for (int i = 1; i < kAllocationDelta; i++) {
__ movp(Operand(rdx, i * kPointerSize), kScratchRegister);
}
if (IsFastObjectElementsKind(elements_kind())) {
// We know the elements array is in new space so we don't need the
// remembered set, but we just pushed a value onto it so we may have to tell
// the incremental marker to rescan the object that we just grew. We don't
// need to worry about the holes because they are in old space and already
// marked black.
__ RecordWrite(rdi, rdx, rbx, kDontSaveFPRegs, OMIT_REMEMBERED_SET);
}
// Restore receiver to rdx as finish sequence assumes it's here.
__ movp(rdx, args.GetReceiverOperand());
// Increment element's and array's sizes.
__ SmiAddConstant(FieldOperand(rdi, FixedArray::kLengthOffset),
Smi::FromInt(kAllocationDelta));
// Make new length a smi before returning it.
__ Integer32ToSmi(rax, rax);
__ movp(FieldOperand(rdx, JSArray::kLengthOffset), rax);
__ ret((argc + 1) * kPointerSize);
__ bind(&call_builtin);
__ TailCallExternalReference(
ExternalReference(Builtins::c_ArrayPush, isolate), argc + 1, 1);
}
void BinaryOpICWithAllocationSiteStub::Generate(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- rdx : left
// -- rax : right
// -- rsp[0] : return address
// -----------------------------------
Isolate* isolate = masm->isolate();
// Load rcx 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(rcx, handle(isolate->heap()->undefined_value()));
// Make sure that we actually patched the allocation site.
if (FLAG_debug_code) {
__ testb(rcx, Immediate(kSmiTagMask));
__ Assert(not_equal, kExpectedAllocationSite);
__ Cmp(FieldOperand(rcx, HeapObject::kMapOffset),
isolate->factory()->allocation_site_map());
__ Assert(equal, kExpectedAllocationSite);
}
// Tail call into the stub that handles binary operations with allocation
// sites.
BinaryOpWithAllocationSiteStub stub(state_);
__ TailCallStub(&stub);
}
void ICCompareStub::GenerateSmis(MacroAssembler* masm) {
ASSERT(state_ == CompareIC::SMI);
Label miss;
__ JumpIfNotBothSmi(rdx, rax, &miss, Label::kNear);
if (GetCondition() == equal) {
// For equality we do not care about the sign of the result.
__ subq(rax, rdx);
} else {
Label done;
__ subq(rdx, rax);
__ j(no_overflow, &done, Label::kNear);
// Correct sign of result in case of overflow.
__ not_(rdx);
__ bind(&done);
__ movp(rax, rdx);
}
__ ret(0);
__ bind(&miss);
GenerateMiss(masm);
}
void ICCompareStub::GenerateNumbers(MacroAssembler* masm) {
ASSERT(state_ == CompareIC::NUMBER);
Label generic_stub;
Label unordered, maybe_undefined1, maybe_undefined2;
Label miss;
if (left_ == CompareIC::SMI) {
__ JumpIfNotSmi(rdx, &miss);
}
if (right_ == CompareIC::SMI) {
__ JumpIfNotSmi(rax, &miss);
}
// Load left and right operand.
Label done, left, left_smi, right_smi;
__ JumpIfSmi(rax, &right_smi, Label::kNear);
__ CompareMap(rax, masm->isolate()->factory()->heap_number_map());
__ j(not_equal, &maybe_undefined1, Label::kNear);
__ movsd(xmm1, FieldOperand(rax, HeapNumber::kValueOffset));
__ jmp(&left, Label::kNear);
__ bind(&right_smi);
__ SmiToInteger32(rcx, rax); // Can't clobber rax yet.
__ Cvtlsi2sd(xmm1, rcx);
__ bind(&left);
__ JumpIfSmi(rdx, &left_smi, Label::kNear);
__ CompareMap(rdx, masm->isolate()->factory()->heap_number_map());
__ j(not_equal, &maybe_undefined2, Label::kNear);
__ movsd(xmm0, FieldOperand(rdx, HeapNumber::kValueOffset));
__ jmp(&done);
__ bind(&left_smi);
__ SmiToInteger32(rcx, rdx); // Can't clobber rdx yet.
__ Cvtlsi2sd(xmm0, rcx);
__ bind(&done);
// Compare operands
__ ucomisd(xmm0, xmm1);
// Don't base result on EFLAGS when a NaN is involved.
__ j(parity_even, &unordered, Label::kNear);
// Return a result of -1, 0, or 1, based on EFLAGS.
// Performing mov, because xor would destroy the flag register.
__ movl(rax, Immediate(0));
__ movl(rcx, Immediate(0));
__ setcc(above, rax); // Add one to zero if carry clear and not equal.
__ sbbq(rax, rcx); // Subtract one if below (aka. carry set).
__ ret(0);
__ bind(&unordered);
__ bind(&generic_stub);
ICCompareStub stub(op_, CompareIC::GENERIC, CompareIC::GENERIC,
CompareIC::GENERIC);
__ jmp(stub.GetCode(masm->isolate()), RelocInfo::CODE_TARGET);
__ bind(&maybe_undefined1);
if (Token::IsOrderedRelationalCompareOp(op_)) {
__ Cmp(rax, masm->isolate()->factory()->undefined_value());
__ j(not_equal, &miss);
__ JumpIfSmi(rdx, &unordered);
__ CmpObjectType(rdx, HEAP_NUMBER_TYPE, rcx);
__ j(not_equal, &maybe_undefined2, Label::kNear);
__ jmp(&unordered);
}
__ bind(&maybe_undefined2);
if (Token::IsOrderedRelationalCompareOp(op_)) {
__ Cmp(rdx, masm->isolate()->factory()->undefined_value());
__ j(equal, &unordered);
}
__ bind(&miss);
GenerateMiss(masm);
}
void ICCompareStub::GenerateInternalizedStrings(MacroAssembler* masm) {
ASSERT(state_ == CompareIC::INTERNALIZED_STRING);
ASSERT(GetCondition() == equal);
// Registers containing left and right operands respectively.
Register left = rdx;
Register right = rax;
Register tmp1 = rcx;
Register tmp2 = rbx;
// Check that both operands are heap objects.
Label miss;
Condition cond = masm->CheckEitherSmi(left, right, tmp1);
__ j(cond, &miss, Label::kNear);
// Check that both operands are internalized strings.
__ movp(tmp1, FieldOperand(left, HeapObject::kMapOffset));
__ movp(tmp2, FieldOperand(right, HeapObject::kMapOffset));
__ movzxbq(tmp1, FieldOperand(tmp1, Map::kInstanceTypeOffset));
__ movzxbq(tmp2, FieldOperand(tmp2, Map::kInstanceTypeOffset));
STATIC_ASSERT(kInternalizedTag == 0 && kStringTag == 0);
__ or_(tmp1, tmp2);
__ testb(tmp1, Immediate(kIsNotStringMask | kIsNotInternalizedMask));
__ j(not_zero, &miss, Label::kNear);
// Internalized strings are compared by identity.
Label done;
__ cmpq(left, right);
// Make sure rax is non-zero. At this point input operands are
// guaranteed to be non-zero.
ASSERT(right.is(rax));
__ j(not_equal, &done, Label::kNear);
STATIC_ASSERT(EQUAL == 0);
STATIC_ASSERT(kSmiTag == 0);
__ Move(rax, Smi::FromInt(EQUAL));
__ bind(&done);
__ ret(0);
__ bind(&miss);
GenerateMiss(masm);
}
void ICCompareStub::GenerateUniqueNames(MacroAssembler* masm) {
ASSERT(state_ == CompareIC::UNIQUE_NAME);
ASSERT(GetCondition() == equal);
// Registers containing left and right operands respectively.
Register left = rdx;
Register right = rax;
Register tmp1 = rcx;
Register tmp2 = rbx;
// Check that both operands are heap objects.
Label miss;
Condition cond = masm->CheckEitherSmi(left, right, tmp1);
__ j(cond, &miss, Label::kNear);
// Check that both operands are unique names. This leaves the instance
// types loaded in tmp1 and tmp2.
__ movp(tmp1, FieldOperand(left, HeapObject::kMapOffset));
__ movp(tmp2, FieldOperand(right, HeapObject::kMapOffset));
__ movzxbq(tmp1, FieldOperand(tmp1, Map::kInstanceTypeOffset));
__ movzxbq(tmp2, FieldOperand(tmp2, Map::kInstanceTypeOffset));
__ JumpIfNotUniqueName(tmp1, &miss, Label::kNear);
__ JumpIfNotUniqueName(tmp2, &miss, Label::kNear);
// Unique names are compared by identity.
Label done;
__ cmpq(left, right);
// Make sure rax is non-zero. At this point input operands are
// guaranteed to be non-zero.
ASSERT(right.is(rax));
__ j(not_equal, &done, Label::kNear);
STATIC_ASSERT(EQUAL == 0);
STATIC_ASSERT(kSmiTag == 0);
__ Move(rax, Smi::FromInt(EQUAL));
__ bind(&done);
__ ret(0);
__ bind(&miss);
GenerateMiss(masm);
}
void ICCompareStub::GenerateStrings(MacroAssembler* masm) {
ASSERT(state_ == CompareIC::STRING);
Label miss;
bool equality = Token::IsEqualityOp(op_);
// Registers containing left and right operands respectively.
Register left = rdx;
Register right = rax;
Register tmp1 = rcx;
Register tmp2 = rbx;
Register tmp3 = rdi;
// Check that both operands are heap objects.
Condition cond = masm->CheckEitherSmi(left, right, tmp1);
__ j(cond, &miss);
// Check that both operands are strings. This leaves the instance
// types loaded in tmp1 and tmp2.
__ movp(tmp1, FieldOperand(left, HeapObject::kMapOffset));
__ movp(tmp2, FieldOperand(right, HeapObject::kMapOffset));
__ movzxbq(tmp1, FieldOperand(tmp1, Map::kInstanceTypeOffset));
__ movzxbq(tmp2, FieldOperand(tmp2, Map::kInstanceTypeOffset));
__ movp(tmp3, tmp1);
STATIC_ASSERT(kNotStringTag != 0);
__ or_(tmp3, tmp2);
__ testb(tmp3, Immediate(kIsNotStringMask));
__ j(not_zero, &miss);
// Fast check for identical strings.
Label not_same;
__ cmpq(left, right);
__ j(not_equal, &not_same, Label::kNear);
STATIC_ASSERT(EQUAL == 0);
STATIC_ASSERT(kSmiTag == 0);
__ Move(rax, Smi::FromInt(EQUAL));
__ ret(0);
// Handle not identical strings.
__ bind(&not_same);
// Check that both strings are internalized strings. If they are, we're done
// because we already know they are not identical. We also know they are both
// strings.
if (equality) {
Label do_compare;
STATIC_ASSERT(kInternalizedTag == 0);
__ or_(tmp1, tmp2);
__ testb(tmp1, Immediate(kIsNotInternalizedMask));
__ j(not_zero, &do_compare, Label::kNear);
// Make sure rax is non-zero. At this point input operands are
// guaranteed to be non-zero.
ASSERT(right.is(rax));
__ ret(0);
__ bind(&do_compare);
}
// Check that both strings are sequential ASCII.
Label runtime;
__ JumpIfNotBothSequentialAsciiStrings(left, right, tmp1, tmp2, &runtime);
// Compare flat ASCII strings. Returns when done.
if (equality) {
StringCompareStub::GenerateFlatAsciiStringEquals(
masm, left, right, tmp1, tmp2);
} else {
StringCompareStub::GenerateCompareFlatAsciiStrings(
masm, left, right, tmp1, tmp2, tmp3, kScratchRegister);
}
// Handle more complex cases in runtime.
__ bind(&runtime);
__ PopReturnAddressTo(tmp1);
__ push(left);
__ push(right);
__ PushReturnAddressFrom(tmp1);
if (equality) {
__ TailCallRuntime(Runtime::kStringEquals, 2, 1);
} else {
__ TailCallRuntime(Runtime::kStringCompare, 2, 1);
}
__ bind(&miss);
GenerateMiss(masm);
}
void ICCompareStub::GenerateObjects(MacroAssembler* masm) {
ASSERT(state_ == CompareIC::OBJECT);
Label miss;
Condition either_smi = masm->CheckEitherSmi(rdx, rax);
__ j(either_smi, &miss, Label::kNear);
__ CmpObjectType(rax, JS_OBJECT_TYPE, rcx);
__ j(not_equal, &miss, Label::kNear);
__ CmpObjectType(rdx, JS_OBJECT_TYPE, rcx);
__ j(not_equal, &miss, Label::kNear);
ASSERT(GetCondition() == equal);
__ subq(rax, rdx);
__ ret(0);
__ bind(&miss);
GenerateMiss(masm);
}
void ICCompareStub::GenerateKnownObjects(MacroAssembler* masm) {
Label miss;
Condition either_smi = masm->CheckEitherSmi(rdx, rax);
__ j(either_smi, &miss, Label::kNear);
__ movp(rcx, FieldOperand(rax, HeapObject::kMapOffset));
__ movp(rbx, FieldOperand(rdx, HeapObject::kMapOffset));
__ Cmp(rcx, known_map_);
__ j(not_equal, &miss, Label::kNear);
__ Cmp(rbx, known_map_);
__ j(not_equal, &miss, Label::kNear);
__ subq(rax, rdx);
__ ret(0);
__ bind(&miss);
GenerateMiss(masm);
}
void ICCompareStub::GenerateMiss(MacroAssembler* masm) {
{
// Call the runtime system in a fresh internal frame.
ExternalReference miss =
ExternalReference(IC_Utility(IC::kCompareIC_Miss), masm->isolate());
FrameScope scope(masm, StackFrame::INTERNAL);
__ push(rdx);
__ push(rax);
__ push(rdx);
__ push(rax);
__ Push(Smi::FromInt(op_));
__ CallExternalReference(miss, 3);
// Compute the entry point of the rewritten stub.
__ lea(rdi, FieldOperand(rax, Code::kHeaderSize));
__ pop(rax);
__ pop(rdx);
}
// Do a tail call to the rewritten stub.
__ jmp(rdi);
}
void NameDictionaryLookupStub::GenerateNegativeLookup(MacroAssembler* masm,
Label* miss,
Label* done,
Register properties,
Handle<Name> name,
Register r0) {
ASSERT(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++) {
// r0 points to properties hash.
// Compute the masked index: (hash + i + i * i) & mask.
Register index = r0;
// Capacity is smi 2^n.
__ SmiToInteger32(index, FieldOperand(properties, kCapacityOffset));
__ decl(index);
__ and_(index,
Immediate(name->Hash() + NameDictionary::GetProbeOffset(i)));
// Scale the index by multiplying by the entry size.
ASSERT(NameDictionary::kEntrySize == 3);
__ lea(index, Operand(index, index, times_2, 0)); // index *= 3.
Register entity_name = r0;
// Having undefined at this place means the name is not contained.
ASSERT_EQ(kSmiTagSize, 1);
__ movp(entity_name, Operand(properties,
index,
times_pointer_size,
kElementsStartOffset - kHeapObjectTag));
__ Cmp(entity_name, masm->isolate()->factory()->undefined_value());
__ j(equal, done);
// Stop if found the property.
__ Cmp(entity_name, Handle<Name>(name));
__ j(equal, miss);
Label good;
// Check for the hole and skip.
__ CompareRoot(entity_name, Heap::kTheHoleValueRootIndex);
__ j(equal, &good, Label::kNear);
// Check if the entry name is not a unique name.
__ movp(entity_name, FieldOperand(entity_name, HeapObject::kMapOffset));
__ JumpIfNotUniqueName(FieldOperand(entity_name, Map::kInstanceTypeOffset),
miss);
__ bind(&good);
}
NameDictionaryLookupStub stub(properties, r0, r0, NEGATIVE_LOOKUP);
__ Push(Handle<Object>(name));
__ push(Immediate(name->Hash()));
__ CallStub(&stub);
__ testq(r0, r0);
__ j(not_zero, miss);
__ jmp(done);
}
// Probe the name dictionary in the |elements| register. Jump to the
// |done| label if a property with the given name is found leaving the
// index into the dictionary in |r1|. Jump to the |miss| label
// otherwise.
void NameDictionaryLookupStub::GeneratePositiveLookup(MacroAssembler* masm,
Label* miss,
Label* done,
Register elements,
Register name,
Register r0,
Register r1) {
ASSERT(!elements.is(r0));
ASSERT(!elements.is(r1));
ASSERT(!name.is(r0));
ASSERT(!name.is(r1));
__ AssertName(name);
__ SmiToInteger32(r0, FieldOperand(elements, kCapacityOffset));
__ decl(r0);
for (int i = 0; i < kInlinedProbes; i++) {
// Compute the masked index: (hash + i + i * i) & mask.
__ movl(r1, FieldOperand(name, Name::kHashFieldOffset));
__ shrl(r1, Immediate(Name::kHashShift));
if (i > 0) {
__ addl(r1, Immediate(NameDictionary::GetProbeOffset(i)));
}
__ and_(r1, r0);
// Scale the index by multiplying by the entry size.
ASSERT(NameDictionary::kEntrySize == 3);
__ lea(r1, Operand(r1, r1, times_2, 0)); // r1 = r1 * 3
// Check if the key is identical to the name.
__ cmpq(name, Operand(elements, r1, times_pointer_size,
kElementsStartOffset - kHeapObjectTag));
__ j(equal, done);
}
NameDictionaryLookupStub stub(elements, r0, r1, POSITIVE_LOOKUP);
__ push(name);
__ movl(r0, FieldOperand(name, Name::kHashFieldOffset));
__ shrl(r0, Immediate(Name::kHashShift));
__ push(r0);
__ CallStub(&stub);
__ testq(r0, r0);
__ j(zero, miss);
__ jmp(done);
}
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.
// Stack frame on entry:
// rsp[0 * kPointerSize] : return address.
// rsp[1 * kPointerSize] : key's hash.
// rsp[2 * kPointerSize] : key.
// Registers:
// dictionary_: NameDictionary to probe.
// result_: used as scratch.
// 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.
Label in_dictionary, maybe_in_dictionary, not_in_dictionary;
Register scratch = result_;
__ SmiToInteger32(scratch, FieldOperand(dictionary_, kCapacityOffset));
__ decl(scratch);
__ push(scratch);
// 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 null value).
StackArgumentsAccessor args(rsp, 2, ARGUMENTS_DONT_CONTAIN_RECEIVER,
kPointerSize);
for (int i = kInlinedProbes; i < kTotalProbes; i++) {
// Compute the masked index: (hash + i + i * i) & mask.
__ movp(scratch, args.GetArgumentOperand(1));
if (i > 0) {
__ addl(scratch, Immediate(NameDictionary::GetProbeOffset(i)));
}
__ and_(scratch, Operand(rsp, 0));
// Scale the index by multiplying by the entry size.
ASSERT(NameDictionary::kEntrySize == 3);
__ lea(index_, Operand(scratch, scratch, times_2, 0)); // index *= 3.
// Having undefined at this place means the name is not contained.
__ movp(scratch, Operand(dictionary_,
index_,
times_pointer_size,
kElementsStartOffset - kHeapObjectTag));
__ Cmp(scratch, masm->isolate()->factory()->undefined_value());
__ j(equal, &not_in_dictionary);
// Stop if found the property.
__ cmpq(scratch, args.GetArgumentOperand(0));
__ j(equal, &in_dictionary);
if (i != kTotalProbes - 1 && mode_ == NEGATIVE_LOOKUP) {
// If we hit a key that is not a unique name during negative
// lookup we have to bailout as this key might be equal to the
// key we are looking for.
// Check if the entry name is not a unique name.
__ movp(scratch, FieldOperand(scratch, HeapObject::kMapOffset));
__ JumpIfNotUniqueName(FieldOperand(scratch, Map::kInstanceTypeOffset),
&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) {
__ movp(scratch, Immediate(0));
__ Drop(1);
__ ret(2 * kPointerSize);
}
__ bind(&in_dictionary);
__ movp(scratch, Immediate(1));
__ Drop(1);
__ ret(2 * kPointerSize);
__ bind(&not_in_dictionary);
__ movp(scratch, Immediate(0));
__ Drop(1);
__ ret(2 * kPointerSize);
}
void StoreBufferOverflowStub::GenerateFixedRegStubsAheadOfTime(
Isolate* isolate) {
StoreBufferOverflowStub stub1(kDontSaveFPRegs);
stub1.GetCode(isolate);
StoreBufferOverflowStub stub2(kSaveFPRegs);
stub2.GetCode(isolate);
}
bool CodeStub::CanUseFPRegisters() {
return true; // Always have SSE2 on x64.
}
// 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 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 a compare instructions (a nop in this position) and the
// real branch when we start and stop incremental heap marking.
// See RecordWriteStub::Patch for details.
__ jmp(&skip_to_incremental_noncompacting, Label::kNear);
__ jmp(&skip_to_incremental_compacting, Label::kFar);
if (remembered_set_action_ == EMIT_REMEMBERED_SET) {
__ RememberedSetHelper(object_,
address_,
value_,
save_fp_regs_mode_,
MacroAssembler::kReturnAtEnd);
} else {
__ ret(0);
}
__ 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.
masm->set_byte_at(0, kTwoByteNopInstruction);
masm->set_byte_at(2, kFiveByteNopInstruction);
}
void RecordWriteStub::GenerateIncremental(MacroAssembler* masm, Mode mode) {
regs_.Save(masm);
if (remembered_set_action_ == EMIT_REMEMBERED_SET) {
Label dont_need_remembered_set;
__ movp(regs_.scratch0(), Operand(regs_.address(), 0));
__ JumpIfNotInNewSpace(regs_.scratch0(),
regs_.scratch0(),
&dont_need_remembered_set);
__ CheckPageFlag(regs_.object(),
regs_.scratch0(),
1 << MemoryChunk::SCAN_ON_SCAVENGE,
not_zero,
&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(0);
}
void RecordWriteStub::InformIncrementalMarker(MacroAssembler* masm) {
regs_.SaveCallerSaveRegisters(masm, save_fp_regs_mode_);
Register address =
arg_reg_1.is(regs_.address()) ? kScratchRegister : regs_.address();
ASSERT(!address.is(regs_.object()));
ASSERT(!address.is(arg_reg_1));
__ Move(address, regs_.address());
__ Move(arg_reg_1, regs_.object());
// TODO(gc) Can we just set address arg2 in the beginning?
__ Move(arg_reg_2, address);
__ LoadAddress(arg_reg_3,
ExternalReference::isolate_address(masm->isolate()));
int argument_count = 3;
AllowExternalCallThatCantCauseGC scope(masm);
__ PrepareCallCFunction(argument_count);
__ CallCFunction(
ExternalReference::incremental_marking_record_write_function(
masm->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_object;
__ movp(regs_.scratch0(), Immediate(~Page::kPageAlignmentMask));
__ and_(regs_.scratch0(), regs_.object());
__ movp(regs_.scratch1(),
Operand(regs_.scratch0(),
MemoryChunk::kWriteBarrierCounterOffset));
__ subq(regs_.scratch1(), Immediate(1));
__ movp(Operand(regs_.scratch0(),
MemoryChunk::kWriteBarrierCounterOffset),
regs_.scratch1());
__ j(negative, &need_incremental);
// 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,
Label::kNear);
regs_.Restore(masm);
if (on_no_need == kUpdateRememberedSetOnNoNeedToInformIncrementalMarker) {
__ RememberedSetHelper(object_,
address_,
value_,
save_fp_regs_mode_,
MacroAssembler::kReturnAtEnd);
} else {
__ ret(0);
}
__ bind(&on_black);
// Get the value from the slot.
__ movp(regs_.scratch0(), Operand(regs_.address(), 0));
if (mode == INCREMENTAL_COMPACTION) {
Label ensure_not_white;
__ CheckPageFlag(regs_.scratch0(), // Contains value.
regs_.scratch1(), // Scratch.
MemoryChunk::kEvacuationCandidateMask,
zero,
&ensure_not_white,
Label::kNear);
__ CheckPageFlag(regs_.object(),
regs_.scratch1(), // Scratch.
MemoryChunk::kSkipEvacuationSlotsRecordingMask,
zero,
&need_incremental);
__ bind(&ensure_not_white);
}
// We need an extra register for this, so we push the object register
// temporarily.
__ push(regs_.object());
__ EnsureNotWhite(regs_.scratch0(), // The value.
regs_.scratch1(), // Scratch.
regs_.object(), // Scratch.
&need_incremental_pop_object,
Label::kNear);
__ pop(regs_.object());
regs_.Restore(masm);
if (on_no_need == kUpdateRememberedSetOnNoNeedToInformIncrementalMarker) {
__ RememberedSetHelper(object_,
address_,
value_,
save_fp_regs_mode_,
MacroAssembler::kReturnAtEnd);
} else {
__ ret(0);
}
__ bind(&need_incremental_pop_object);
__ pop(regs_.object());
__ bind(&need_incremental);
// Fall through when we need to inform the incremental marker.
}
void StoreArrayLiteralElementStub::Generate(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- rax : element value to store
// -- rcx : element index as smi
// -- rsp[0] : return address
// -- rsp[8] : array literal index in function
// -- rsp[16] : array literal
// clobbers rbx, rdx, rdi
// -----------------------------------
Label element_done;
Label double_elements;
Label smi_element;
Label slow_elements;
Label fast_elements;
// Get array literal index, array literal and its map.
StackArgumentsAccessor args(rsp, 2, ARGUMENTS_DONT_CONTAIN_RECEIVER);
__ movp(rdx, args.GetArgumentOperand(1));
__ movp(rbx, args.GetArgumentOperand(0));
__ movp(rdi, FieldOperand(rbx, JSObject::kMapOffset));
__ CheckFastElements(rdi, &double_elements);
// FAST_*_SMI_ELEMENTS or FAST_*_ELEMENTS
__ JumpIfSmi(rax, &smi_element);
__ CheckFastSmiElements(rdi, &fast_elements);
// Store into the array literal requires a elements transition. Call into
// the runtime.
__ bind(&slow_elements);
__ PopReturnAddressTo(rdi);
__ push(rbx);
__ push(rcx);
__ push(rax);
__ movp(rbx, Operand(rbp, JavaScriptFrameConstants::kFunctionOffset));
__ push(FieldOperand(rbx, JSFunction::kLiteralsOffset));
__ push(rdx);
__ PushReturnAddressFrom(rdi);
__ TailCallRuntime(Runtime::kStoreArrayLiteralElement, 5, 1);
// Array literal has ElementsKind of FAST_*_ELEMENTS and value is an object.
__ bind(&fast_elements);
__ SmiToInteger32(kScratchRegister, rcx);
__ movp(rbx, FieldOperand(rbx, JSObject::kElementsOffset));
__ lea(rcx, FieldOperand(rbx, kScratchRegister, times_pointer_size,
FixedArrayBase::kHeaderSize));
__ movp(Operand(rcx, 0), rax);
// Update the write barrier for the array store.
__ RecordWrite(rbx, rcx, rax,
kDontSaveFPRegs,
EMIT_REMEMBERED_SET,
OMIT_SMI_CHECK);
__ ret(0);
// Array literal has ElementsKind of FAST_*_SMI_ELEMENTS or
// FAST_*_ELEMENTS, and value is Smi.
__ bind(&smi_element);
__ SmiToInteger32(kScratchRegister, rcx);
__ movp(rbx, FieldOperand(rbx, JSObject::kElementsOffset));
__ movp(FieldOperand(rbx, kScratchRegister, times_pointer_size,
FixedArrayBase::kHeaderSize), rax);
__ ret(0);
// Array literal has ElementsKind of FAST_DOUBLE_ELEMENTS.
__ bind(&double_elements);
__ movp(r9, FieldOperand(rbx, JSObject::kElementsOffset));
__ SmiToInteger32(r11, rcx);
__ StoreNumberToDoubleElements(rax,
r9,
r11,
xmm0,
&slow_elements);
__ ret(0);
}
void StubFailureTrampolineStub::Generate(MacroAssembler* masm) {
CEntryStub ces(1, fp_registers_ ? kSaveFPRegs : kDontSaveFPRegs);
__ Call(ces.GetCode(masm->isolate()), RelocInfo::CODE_TARGET);
int parameter_count_offset =
StubFailureTrampolineFrame::kCallerStackParameterCountFrameOffset;
__ movp(rbx, MemOperand(rbp, parameter_count_offset));
masm->LeaveFrame(StackFrame::STUB_FAILURE_TRAMPOLINE);
__ PopReturnAddressTo(rcx);
int additional_offset = function_mode_ == JS_FUNCTION_STUB_MODE
? kPointerSize
: 0;
__ lea(rsp, MemOperand(rsp, rbx, times_pointer_size, additional_offset));
__ jmp(rcx); // Return to IC Miss stub, continuation still on stack.
}
void ProfileEntryHookStub::MaybeCallEntryHook(MacroAssembler* masm) {
if (masm->isolate()->function_entry_hook() != NULL) {
ProfileEntryHookStub stub;
masm->CallStub(&stub);
}
}
void ProfileEntryHookStub::Generate(MacroAssembler* masm) {
// This stub can be called from essentially anywhere, so it needs to save
// all volatile and callee-save registers.
const size_t kNumSavedRegisters = 2;
__ push(arg_reg_1);
__ push(arg_reg_2);
// Calculate the original stack pointer and store it in the second arg.
__ lea(arg_reg_2,
Operand(rsp, kNumSavedRegisters * kRegisterSize + kPCOnStackSize));
// Calculate the function address to the first arg.
__ movp(arg_reg_1, Operand(rsp, kNumSavedRegisters * kRegisterSize));
__ subq(arg_reg_1, Immediate(Assembler::kShortCallInstructionLength));
// Save the remainder of the volatile registers.
masm->PushCallerSaved(kSaveFPRegs, arg_reg_1, arg_reg_2);
// Call the entry hook function.
__ Move(rax, FUNCTION_ADDR(masm->isolate()->function_entry_hook()),
Assembler::RelocInfoNone());
AllowExternalCallThatCantCauseGC scope(masm);
const int kArgumentCount = 2;
__ PrepareCallCFunction(kArgumentCount);
__ CallCFunction(rax, kArgumentCount);
// Restore volatile regs.
masm->PopCallerSaved(kSaveFPRegs, arg_reg_1, arg_reg_2);
__ pop(arg_reg_2);
__ pop(arg_reg_1);
__ Ret();
}
template<class T>
static void CreateArrayDispatch(MacroAssembler* masm,
AllocationSiteOverrideMode mode) {
if (mode == DISABLE_ALLOCATION_SITES) {
T stub(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) {
Label next;
ElementsKind kind = GetFastElementsKindFromSequenceIndex(i);
__ cmpl(rdx, Immediate(kind));
__ j(not_equal, &next);
T stub(kind);
__ TailCallStub(&stub);
__ bind(&next);
}
// If we reached this point there is a problem.
__ Abort(kUnexpectedElementsKindInArrayConstructor);
} else {
UNREACHABLE();
}
}
static void CreateArrayDispatchOneArgument(MacroAssembler* masm,
AllocationSiteOverrideMode mode) {
// rbx - allocation site (if mode != DISABLE_ALLOCATION_SITES)
// rdx - kind (if mode != DISABLE_ALLOCATION_SITES)
// rax - number of arguments
// rdi - constructor?
// rsp[0] - return address
// rsp[8] - last argument
Handle<Object> undefined_sentinel(
masm->isolate()->heap()->undefined_value(),
masm->isolate());
Label normal_sequence;
if (mode == DONT_OVERRIDE) {
ASSERT(FAST_SMI_ELEMENTS == 0);
ASSERT(FAST_HOLEY_SMI_ELEMENTS == 1);
ASSERT(FAST_ELEMENTS == 2);
ASSERT(FAST_HOLEY_ELEMENTS == 3);
ASSERT(FAST_DOUBLE_ELEMENTS == 4);
ASSERT(FAST_HOLEY_DOUBLE_ELEMENTS == 5);
// is the low bit set? If so, we are holey and that is good.
__ testb(rdx, Immediate(1));
__ j(not_zero, &normal_sequence);
}
// look at the first argument
StackArgumentsAccessor args(rsp, 1, ARGUMENTS_DONT_CONTAIN_RECEIVER);
__ movp(rcx, args.GetArgumentOperand(0));
__ testq(rcx, rcx);
__ j(zero, &normal_sequence);
if (mode == DISABLE_ALLOCATION_SITES) {
ElementsKind initial = GetInitialFastElementsKind();
ElementsKind holey_initial = GetHoleyElementsKind(initial);
ArraySingleArgumentConstructorStub stub_holey(holey_initial,
DISABLE_ALLOCATION_SITES);
__ TailCallStub(&stub_holey);
__ bind(&normal_sequence);
ArraySingleArgumentConstructorStub stub(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).
__ incl(rdx);
if (FLAG_debug_code) {
Handle<Map> allocation_site_map =
masm->isolate()->factory()->allocation_site_map();
__ Cmp(FieldOperand(rbx, 0), allocation_site_map);
__ Assert(equal, kExpectedAllocationSite);
}
// Save the resulting elements kind in type info. We can't just store r3
// 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);
__ SmiAddConstant(FieldOperand(rbx, AllocationSite::kTransitionInfoOffset),
Smi::FromInt(kFastElementsKindPackedToHoley));
__ bind(&normal_sequence);
int last_index = GetSequenceIndexFromFastElementsKind(
TERMINAL_FAST_ELEMENTS_KIND);
for (int i = 0; i <= last_index; ++i) {
Label next;
ElementsKind kind = GetFastElementsKindFromSequenceIndex(i);
__ cmpl(rdx, Immediate(kind));
__ j(not_equal, &next);
ArraySingleArgumentConstructorStub stub(kind);
__ TailCallStub(&stub);
__ bind(&next);
}
// 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(kind);
stub.GetCode(isolate);
if (AllocationSite::GetMode(kind) != DONT_TRACK_ALLOCATION_SITE) {
T stub1(kind, DISABLE_ALLOCATION_SITES);
stub1.GetCode(isolate);
}
}
}
void ArrayConstructorStubBase::GenerateStubsAheadOfTime(Isolate* isolate) {
ArrayConstructorStubAheadOfTimeHelper<ArrayNoArgumentConstructorStub>(
isolate);
ArrayConstructorStubAheadOfTimeHelper<ArraySingleArgumentConstructorStub>(
isolate);
ArrayConstructorStubAheadOfTimeHelper<ArrayNArgumentsConstructorStub>(
isolate);
}
void InternalArrayConstructorStubBase::GenerateStubsAheadOfTime(
Isolate* isolate) {
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(kinds[i]);
stubh1.GetCode(isolate);
InternalArraySingleArgumentConstructorStub stubh2(kinds[i]);
stubh2.GetCode(isolate);
InternalArrayNArgumentsConstructorStub stubh3(kinds[i]);
stubh3.GetCode(isolate);
}
}
void ArrayConstructorStub::GenerateDispatchToArrayStub(
MacroAssembler* masm,
AllocationSiteOverrideMode mode) {
if (argument_count_ == ANY) {
Label not_zero_case, not_one_case;
__ testq(rax, rax);
__ j(not_zero, &not_zero_case);
CreateArrayDispatch<ArrayNoArgumentConstructorStub>(masm, mode);
__ bind(&not_zero_case);
__ cmpl(rax, Immediate(1));
__ j(greater, &not_one_case);
CreateArrayDispatchOneArgument(masm, mode);
__ bind(&not_one_case);
CreateArrayDispatch<ArrayNArgumentsConstructorStub>(masm, mode);
} else if (argument_count_ == NONE) {
CreateArrayDispatch<ArrayNoArgumentConstructorStub>(masm, mode);
} else if (argument_count_ == ONE) {
CreateArrayDispatchOneArgument(masm, mode);
} else if (argument_count_ == MORE_THAN_ONE) {
CreateArrayDispatch<ArrayNArgumentsConstructorStub>(masm, mode);
} else {
UNREACHABLE();
}
}
void ArrayConstructorStub::Generate(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- rax : argc
// -- rbx : feedback vector (fixed array or megamorphic symbol)
// -- rdx : slot index (if ebx is fixed array)
// -- rdi : constructor
// -- rsp[0] : return address
// -- rsp[8] : last argument
// -----------------------------------
Handle<Object> megamorphic_sentinel =
TypeFeedbackInfo::MegamorphicSentinel(masm->isolate());
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.
__ movp(rcx, FieldOperand(rdi, JSFunction::kPrototypeOrInitialMapOffset));
// Will both indicate a NULL and a Smi.
STATIC_ASSERT(kSmiTag == 0);
Condition not_smi = NegateCondition(masm->CheckSmi(rcx));
__ Check(not_smi, kUnexpectedInitialMapForArrayFunction);
__ CmpObjectType(rcx, MAP_TYPE, rcx);
__ Check(equal, kUnexpectedInitialMapForArrayFunction);
// We should either have the megamorphic symbol in rbx or a valid
// fixed array.
Label okay_here;
Handle<Map> fixed_array_map = masm->isolate()->factory()->fixed_array_map();
__ Cmp(rbx, megamorphic_sentinel);
__ j(equal, &okay_here);
__ Cmp(FieldOperand(rbx, 0), fixed_array_map);
__ Assert(equal, kExpectedFixedArrayInRegisterRbx);
// rdx should be a smi if we don't have the megamorphic symbol in rbx.
__ AssertSmi(rdx);
__ bind(&okay_here);
}
Label no_info;
// If the feedback slot is the megamorphic sentinel, or contains anything
// other than an AllocationSite, call an array constructor that doesn't use
// AllocationSites.
__ Cmp(rbx, megamorphic_sentinel);
__ j(equal, &no_info);
__ SmiToInteger32(rdx, rdx);
__ movp(rbx, FieldOperand(rbx, rdx, times_pointer_size,
FixedArray::kHeaderSize));
__ Integer32ToSmi(rdx, rdx);
__ Cmp(FieldOperand(rbx, 0),
masm->isolate()->factory()->allocation_site_map());
__ j(not_equal, &no_info);
// Only look at the lower 16 bits of the transition info.
__ movp(rdx, FieldOperand(rbx, AllocationSite::kTransitionInfoOffset));
__ SmiToInteger32(rdx, rdx);
STATIC_ASSERT(AllocationSite::ElementsKindBits::kShift == 0);
__ and_(rdx, Immediate(AllocationSite::ElementsKindBits::kMask));
GenerateDispatchToArrayStub(masm, DONT_OVERRIDE);
__ bind(&no_info);
GenerateDispatchToArrayStub(masm, DISABLE_ALLOCATION_SITES);
}
void InternalArrayConstructorStub::GenerateCase(
MacroAssembler* masm, ElementsKind kind) {
Label not_zero_case, not_one_case;
Label normal_sequence;
__ testq(rax, rax);
__ j(not_zero, &not_zero_case);
InternalArrayNoArgumentConstructorStub stub0(kind);
__ TailCallStub(&stub0);
__ bind(&not_zero_case);
__ cmpl(rax, Immediate(1));
__ j(greater, &not_one_case);
if (IsFastPackedElementsKind(kind)) {
// We might need to create a holey array
// look at the first argument
StackArgumentsAccessor args(rsp, 1, ARGUMENTS_DONT_CONTAIN_RECEIVER);
__ movp(rcx, args.GetArgumentOperand(0));
__ testq(rcx, rcx);
__ j(zero, &normal_sequence);
InternalArraySingleArgumentConstructorStub
stub1_holey(GetHoleyElementsKind(kind));
__ TailCallStub(&stub1_holey);
}
__ bind(&normal_sequence);
InternalArraySingleArgumentConstructorStub stub1(kind);
__ TailCallStub(&stub1);
__ bind(&not_one_case);
InternalArrayNArgumentsConstructorStub stubN(kind);
__ TailCallStub(&stubN);
}
void InternalArrayConstructorStub::Generate(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- rax : argc
// -- rdi : constructor
// -- rsp[0] : return address
// -- rsp[8] : 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.
__ movp(rcx, FieldOperand(rdi, JSFunction::kPrototypeOrInitialMapOffset));
// Will both indicate a NULL and a Smi.
STATIC_ASSERT(kSmiTag == 0);
Condition not_smi = NegateCondition(masm->CheckSmi(rcx));
__ Check(not_smi, kUnexpectedInitialMapForArrayFunction);
__ CmpObjectType(rcx, MAP_TYPE, rcx);
__ Check(equal, kUnexpectedInitialMapForArrayFunction);
}
// Figure out the right elements kind
__ movp(rcx, FieldOperand(rdi, JSFunction::kPrototypeOrInitialMapOffset));
// Load the map's "bit field 2" into |result|. We only need the first byte,
// but the following masking takes care of that anyway.
__ movzxbq(rcx, FieldOperand(rcx, Map::kBitField2Offset));
// Retrieve elements_kind from bit field 2.
__ and_(rcx, Immediate(Map::kElementsKindMask));
__ shr(rcx, Immediate(Map::kElementsKindShift));
if (FLAG_debug_code) {
Label done;
__ cmpl(rcx, Immediate(FAST_ELEMENTS));
__ j(equal, &done);
__ cmpl(rcx, Immediate(FAST_HOLEY_ELEMENTS));
__ Assert(equal,
kInvalidElementsKindForInternalArrayOrInternalPackedArray);
__ bind(&done);
}
Label fast_elements_case;
__ cmpl(rcx, Immediate(FAST_ELEMENTS));
__ j(equal, &fast_elements_case);
GenerateCase(masm, FAST_HOLEY_ELEMENTS);
__ bind(&fast_elements_case);
GenerateCase(masm, FAST_ELEMENTS);
}
void CallApiFunctionStub::Generate(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- rax : callee
// -- rbx : call_data
// -- rcx : holder
// -- rdx : api_function_address
// -- rsi : context
// --
// -- rsp[0] : return address
// -- rsp[8] : last argument
// -- ...
// -- rsp[argc * 8] : first argument
// -- rsp[(argc + 1) * 8] : receiver
// -----------------------------------
Register callee = rax;
Register call_data = rbx;
Register holder = rcx;
Register api_function_address = rdx;
Register return_address = rdi;
Register context = rsi;
int argc = ArgumentBits::decode(bit_field_);
bool is_store = IsStoreBits::decode(bit_field_);
bool call_data_undefined = CallDataUndefinedBits::decode(bit_field_);
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::kArgsLength == 7);
__ PopReturnAddressTo(return_address);
// context save
__ push(context);
// load context from callee
__ movp(context, FieldOperand(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
__ Move(scratch,
ExternalReference::isolate_address(masm->isolate()));
__ push(scratch);
// holder
__ push(holder);
__ movp(scratch, rsp);
// Push return address back on stack.
__ PushReturnAddressFrom(return_address);
// Allocate the v8::Arguments structure in the arguments' space since
// it's not controlled by GC.
const int kApiStackSpace = 4;
__ PrepareCallApiFunction(kApiStackSpace);
// FunctionCallbackInfo::implicit_args_.
__ movp(StackSpaceOperand(0), scratch);
__ addq(scratch, Immediate((argc + FCA::kArgsLength - 1) * kPointerSize));
__ movp(StackSpaceOperand(1), scratch); // FunctionCallbackInfo::values_.
__ Set(StackSpaceOperand(2), argc); // FunctionCallbackInfo::length_.
// FunctionCallbackInfo::is_construct_call_.
__ Set(StackSpaceOperand(3), 0);
#if defined(__MINGW64__) || defined(_WIN64)
Register arguments_arg = rcx;
Register callback_arg = rdx;
#else
Register arguments_arg = rdi;
Register callback_arg = rsi;
#endif
// It's okay if api_function_address == callback_arg
// but not arguments_arg
ASSERT(!api_function_address.is(arguments_arg));
// v8::InvocationCallback's argument.
__ lea(arguments_arg, StackSpaceOperand(0));
Address thunk_address = FUNCTION_ADDR(&InvokeFunctionCallback);
// Accessor for FunctionCallbackInfo and first js arg.
StackArgumentsAccessor args_from_rbp(rbp, FCA::kArgsLength + 1,
ARGUMENTS_DONT_CONTAIN_RECEIVER);
Operand context_restore_operand = args_from_rbp.GetArgumentOperand(
FCA::kArgsLength - FCA::kContextSaveIndex);
// Stores return the first js argument
Operand return_value_operand = args_from_rbp.GetArgumentOperand(
is_store ? 0 : FCA::kArgsLength - FCA::kReturnValueOffset);
__ CallApiFunctionAndReturn(
api_function_address,
thunk_address,
callback_arg,
argc + FCA::kArgsLength + 1,
return_value_operand,
&context_restore_operand);
}
void CallApiGetterStub::Generate(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- rsp[0] : return address
// -- rsp[8] : name
// -- rsp[16 - kArgsLength*8] : PropertyCallbackArguments object
// -- ...
// -- r8 : api_function_address
// -----------------------------------
#if defined(__MINGW64__) || defined(_WIN64)
Register getter_arg = r8;
Register accessor_info_arg = rdx;
Register name_arg = rcx;
#else
Register getter_arg = rdx;
Register accessor_info_arg = rsi;
Register name_arg = rdi;
#endif
Register api_function_address = r8;
Register scratch = rax;
// v8::Arguments::values_ and handler for name.
const int kStackSpace = PropertyCallbackArguments::kArgsLength + 1;
// Allocate v8::AccessorInfo in non-GCed stack space.
const int kArgStackSpace = 1;
__ lea(name_arg, Operand(rsp, kPCOnStackSize));
__ PrepareCallApiFunction(kArgStackSpace);
__ lea(scratch, Operand(name_arg, 1 * kPointerSize));
// v8::PropertyAccessorInfo::args_.
__ movp(StackSpaceOperand(0), scratch);
// The context register (rsi) has been saved in PrepareCallApiFunction and
// could be used to pass arguments.
__ lea(accessor_info_arg, StackSpaceOperand(0));
Address thunk_address = FUNCTION_ADDR(&InvokeAccessorGetterCallback);
// It's okay if api_function_address == getter_arg
// but not accessor_info_arg or name_arg
ASSERT(!api_function_address.is(accessor_info_arg) &&
!api_function_address.is(name_arg));
// The name handler is counted as an argument.
StackArgumentsAccessor args(rbp, PropertyCallbackArguments::kArgsLength);
Operand return_value_operand = args.GetArgumentOperand(
PropertyCallbackArguments::kArgsLength - 1 -
PropertyCallbackArguments::kReturnValueOffset);
__ CallApiFunctionAndReturn(api_function_address,
thunk_address,
getter_arg,
kStackSpace,
return_value_operand,
NULL);
}
#undef __
} } // namespace v8::internal
#endif // V8_TARGET_ARCH_X64
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