Google Git
Sign in
ara-mdk / platform / external / v8 / 9ac36c9faca11611ada13b4054edbaa0738661d0 / . / src / ia32 / code-stubs-ia32.cc
blob: 366b91ef60d861f929e5320a9714468878e768c3 [file] [log] [blame]
// Copyright 2010 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 defined(V8_TARGET_ARCH_IA32)
#include "code-stubs.h"
#include "bootstrapper.h"
#include "jsregexp.h"
#include "regexp-macro-assembler.h"
namespace v8 {
namespace internal {
#define __ ACCESS_MASM(masm)
void FastNewClosureStub::Generate(MacroAssembler* masm) {
// Create a new closure from the given function info in new
// space. Set the context to the current context in esi.
Label gc;
__ AllocateInNewSpace(JSFunction::kSize, eax, ebx, ecx, &gc, TAG_OBJECT);
// Get the function info from the stack.
__ mov(edx, Operand(esp, 1 * kPointerSize));
// Compute the function map in the current global context and set that
// as the map of the allocated object.
__ mov(ecx, Operand(esi, Context::SlotOffset(Context::GLOBAL_INDEX)));
__ mov(ecx, FieldOperand(ecx, GlobalObject::kGlobalContextOffset));
__ mov(ecx, Operand(ecx, Context::SlotOffset(Context::FUNCTION_MAP_INDEX)));
__ mov(FieldOperand(eax, JSObject::kMapOffset), ecx);
// Initialize the rest of the function. We don't have to update the
// write barrier because the allocated object is in new space.
__ mov(ebx, Immediate(Factory::empty_fixed_array()));
__ mov(FieldOperand(eax, JSObject::kPropertiesOffset), ebx);
__ mov(FieldOperand(eax, JSObject::kElementsOffset), ebx);
__ mov(FieldOperand(eax, JSFunction::kPrototypeOrInitialMapOffset),
Immediate(Factory::the_hole_value()));
__ mov(FieldOperand(eax, JSFunction::kSharedFunctionInfoOffset), edx);
__ mov(FieldOperand(eax, JSFunction::kContextOffset), esi);
__ mov(FieldOperand(eax, JSFunction::kLiteralsOffset), ebx);
// Initialize the code pointer in the function to be the one
// found in the shared function info object.
__ mov(edx, FieldOperand(edx, SharedFunctionInfo::kCodeOffset));
__ lea(edx, FieldOperand(edx, Code::kHeaderSize));
__ mov(FieldOperand(eax, JSFunction::kCodeEntryOffset), edx);
// Return and remove the on-stack parameter.
__ ret(1 * kPointerSize);
// Create a new closure through the slower runtime call.
__ bind(&gc);
__ pop(ecx); // Temporarily remove return address.
__ pop(edx);
__ push(esi);
__ push(edx);
__ push(ecx); // Restore return address.
__ TailCallRuntime(Runtime::kNewClosure, 2, 1);
}
void FastNewContextStub::Generate(MacroAssembler* masm) {
// Try to allocate the context in new space.
Label gc;
int length = slots_ + Context::MIN_CONTEXT_SLOTS;
__ AllocateInNewSpace((length * kPointerSize) + FixedArray::kHeaderSize,
eax, ebx, ecx, &gc, TAG_OBJECT);
// Get the function from the stack.
__ mov(ecx, Operand(esp, 1 * kPointerSize));
// Setup the object header.
__ mov(FieldOperand(eax, HeapObject::kMapOffset), Factory::context_map());
__ mov(FieldOperand(eax, Context::kLengthOffset),
Immediate(Smi::FromInt(length)));
// Setup the fixed slots.
__ xor_(ebx, Operand(ebx)); // Set to NULL.
__ mov(Operand(eax, Context::SlotOffset(Context::CLOSURE_INDEX)), ecx);
__ mov(Operand(eax, Context::SlotOffset(Context::FCONTEXT_INDEX)), eax);
__ mov(Operand(eax, Context::SlotOffset(Context::PREVIOUS_INDEX)), ebx);
__ mov(Operand(eax, Context::SlotOffset(Context::EXTENSION_INDEX)), ebx);
// Copy the global object from the surrounding context. We go through the
// context in the function (ecx) to match the allocation behavior we have
// in the runtime system (see Heap::AllocateFunctionContext).
__ mov(ebx, FieldOperand(ecx, JSFunction::kContextOffset));
__ mov(ebx, Operand(ebx, Context::SlotOffset(Context::GLOBAL_INDEX)));
__ mov(Operand(eax, Context::SlotOffset(Context::GLOBAL_INDEX)), ebx);
// Initialize the rest of the slots to undefined.
__ mov(ebx, Factory::undefined_value());
for (int i = Context::MIN_CONTEXT_SLOTS; i < length; i++) {
__ mov(Operand(eax, Context::SlotOffset(i)), ebx);
}
// Return and remove the on-stack parameter.
__ mov(esi, Operand(eax));
__ ret(1 * kPointerSize);
// Need to collect. Call into runtime system.
__ bind(&gc);
__ TailCallRuntime(Runtime::kNewContext, 1, 1);
}
void FastCloneShallowArrayStub::Generate(MacroAssembler* masm) {
// Stack layout on entry:
//
// [esp + kPointerSize]: constant elements.
// [esp + (2 * kPointerSize)]: literal index.
// [esp + (3 * kPointerSize)]: literals array.
// All sizes here are multiples of kPointerSize.
int elements_size = (length_ > 0) ? FixedArray::SizeFor(length_) : 0;
int size = JSArray::kSize + elements_size;
// Load boilerplate object into ecx and check if we need to create a
// boilerplate.
Label slow_case;
__ mov(ecx, Operand(esp, 3 * kPointerSize));
__ mov(eax, Operand(esp, 2 * kPointerSize));
STATIC_ASSERT(kPointerSize == 4);
STATIC_ASSERT(kSmiTagSize == 1);
STATIC_ASSERT(kSmiTag == 0);
__ mov(ecx, FieldOperand(ecx, eax, times_half_pointer_size,
FixedArray::kHeaderSize));
__ cmp(ecx, Factory::undefined_value());
__ j(equal, &slow_case);
if (FLAG_debug_code) {
const char* message;
Handle<Map> expected_map;
if (mode_ == CLONE_ELEMENTS) {
message = "Expected (writable) fixed array";
expected_map = Factory::fixed_array_map();
} else {
ASSERT(mode_ == COPY_ON_WRITE_ELEMENTS);
message = "Expected copy-on-write fixed array";
expected_map = Factory::fixed_cow_array_map();
}
__ push(ecx);
__ mov(ecx, FieldOperand(ecx, JSArray::kElementsOffset));
__ cmp(FieldOperand(ecx, HeapObject::kMapOffset), expected_map);
__ Assert(equal, message);
__ pop(ecx);
}
// Allocate both the JS array and the elements array in one big
// allocation. This avoids multiple limit checks.
__ AllocateInNewSpace(size, eax, ebx, edx, &slow_case, TAG_OBJECT);
// Copy the JS array part.
for (int i = 0; i < JSArray::kSize; i += kPointerSize) {
if ((i != JSArray::kElementsOffset) || (length_ == 0)) {
__ mov(ebx, FieldOperand(ecx, i));
__ mov(FieldOperand(eax, i), ebx);
}
}
if (length_ > 0) {
// Get hold of the elements array of the boilerplate and setup the
// elements pointer in the resulting object.
__ mov(ecx, FieldOperand(ecx, JSArray::kElementsOffset));
__ lea(edx, Operand(eax, JSArray::kSize));
__ mov(FieldOperand(eax, JSArray::kElementsOffset), edx);
// Copy the elements array.
for (int i = 0; i < elements_size; i += kPointerSize) {
__ mov(ebx, FieldOperand(ecx, i));
__ mov(FieldOperand(edx, i), ebx);
}
}
// Return and remove the on-stack parameters.
__ ret(3 * kPointerSize);
__ bind(&slow_case);
__ TailCallRuntime(Runtime::kCreateArrayLiteralShallow, 3, 1);
}
// NOTE: The stub does not handle the inlined cases (Smis, Booleans, undefined).
void ToBooleanStub::Generate(MacroAssembler* masm) {
Label false_result, true_result, not_string;
__ mov(eax, Operand(esp, 1 * kPointerSize));
// 'null' => false.
__ cmp(eax, Factory::null_value());
__ j(equal, &false_result);
// Get the map and type of the heap object.
__ mov(edx, FieldOperand(eax, HeapObject::kMapOffset));
__ movzx_b(ecx, FieldOperand(edx, Map::kInstanceTypeOffset));
// Undetectable => false.
__ test_b(FieldOperand(edx, Map::kBitFieldOffset),
1 << Map::kIsUndetectable);
__ j(not_zero, &false_result);
// JavaScript object => true.
__ CmpInstanceType(edx, FIRST_JS_OBJECT_TYPE);
__ j(above_equal, &true_result);
// String value => false iff empty.
__ CmpInstanceType(edx, FIRST_NONSTRING_TYPE);
__ j(above_equal, &not_string);
STATIC_ASSERT(kSmiTag == 0);
__ cmp(FieldOperand(eax, String::kLengthOffset), Immediate(0));
__ j(zero, &false_result);
__ jmp(&true_result);
__ bind(&not_string);
// HeapNumber => false iff +0, -0, or NaN.
__ cmp(edx, Factory::heap_number_map());
__ j(not_equal, &true_result);
__ fldz();
__ fld_d(FieldOperand(eax, HeapNumber::kValueOffset));
__ FCmp();
__ j(zero, &false_result);
// Fall through to |true_result|.
// Return 1/0 for true/false in eax.
__ bind(&true_result);
__ mov(eax, 1);
__ ret(1 * kPointerSize);
__ bind(&false_result);
__ mov(eax, 0);
__ ret(1 * kPointerSize);
}
const char* GenericBinaryOpStub::GetName() {
if (name_ != NULL) return name_;
const int kMaxNameLength = 100;
name_ = Bootstrapper::AllocateAutoDeletedArray(kMaxNameLength);
if (name_ == NULL) return "OOM";
const char* op_name = Token::Name(op_);
const char* overwrite_name;
switch (mode_) {
case NO_OVERWRITE: overwrite_name = "Alloc"; break;
case OVERWRITE_RIGHT: overwrite_name = "OverwriteRight"; break;
case OVERWRITE_LEFT: overwrite_name = "OverwriteLeft"; break;
default: overwrite_name = "UnknownOverwrite"; break;
}
OS::SNPrintF(Vector<char>(name_, kMaxNameLength),
"GenericBinaryOpStub_%s_%s%s_%s%s_%s_%s",
op_name,
overwrite_name,
(flags_ & NO_SMI_CODE_IN_STUB) ? "_NoSmiInStub" : "",
args_in_registers_ ? "RegArgs" : "StackArgs",
args_reversed_ ? "_R" : "",
static_operands_type_.ToString(),
BinaryOpIC::GetName(runtime_operands_type_));
return name_;
}
void GenericBinaryOpStub::GenerateCall(
MacroAssembler* masm,
Register left,
Register right) {
if (!ArgsInRegistersSupported()) {
// Pass arguments on the stack.
__ push(left);
__ push(right);
} else {
// The calling convention with registers is left in edx and right in eax.
Register left_arg = edx;
Register right_arg = eax;
if (!(left.is(left_arg) && right.is(right_arg))) {
if (left.is(right_arg) && right.is(left_arg)) {
if (IsOperationCommutative()) {
SetArgsReversed();
} else {
__ xchg(left, right);
}
} else if (left.is(left_arg)) {
__ mov(right_arg, right);
} else if (right.is(right_arg)) {
__ mov(left_arg, left);
} else if (left.is(right_arg)) {
if (IsOperationCommutative()) {
__ mov(left_arg, right);
SetArgsReversed();
} else {
// Order of moves important to avoid destroying left argument.
__ mov(left_arg, left);
__ mov(right_arg, right);
}
} else if (right.is(left_arg)) {
if (IsOperationCommutative()) {
__ mov(right_arg, left);
SetArgsReversed();
} else {
// Order of moves important to avoid destroying right argument.
__ mov(right_arg, right);
__ mov(left_arg, left);
}
} else {
// Order of moves is not important.
__ mov(left_arg, left);
__ mov(right_arg, right);
}
}
// Update flags to indicate that arguments are in registers.
SetArgsInRegisters();
__ IncrementCounter(&Counters::generic_binary_stub_calls_regs, 1);
}
// Call the stub.
__ CallStub(this);
}
void GenericBinaryOpStub::GenerateCall(
MacroAssembler* masm,
Register left,
Smi* right) {
if (!ArgsInRegistersSupported()) {
// Pass arguments on the stack.
__ push(left);
__ push(Immediate(right));
} else {
// The calling convention with registers is left in edx and right in eax.
Register left_arg = edx;
Register right_arg = eax;
if (left.is(left_arg)) {
__ mov(right_arg, Immediate(right));
} else if (left.is(right_arg) && IsOperationCommutative()) {
__ mov(left_arg, Immediate(right));
SetArgsReversed();
} else {
// For non-commutative operations, left and right_arg might be
// the same register. Therefore, the order of the moves is
// important here in order to not overwrite left before moving
// it to left_arg.
__ mov(left_arg, left);
__ mov(right_arg, Immediate(right));
}
// Update flags to indicate that arguments are in registers.
SetArgsInRegisters();
__ IncrementCounter(&Counters::generic_binary_stub_calls_regs, 1);
}
// Call the stub.
__ CallStub(this);
}
void GenericBinaryOpStub::GenerateCall(
MacroAssembler* masm,
Smi* left,
Register right) {
if (!ArgsInRegistersSupported()) {
// Pass arguments on the stack.
__ push(Immediate(left));
__ push(right);
} else {
// The calling convention with registers is left in edx and right in eax.
Register left_arg = edx;
Register right_arg = eax;
if (right.is(right_arg)) {
__ mov(left_arg, Immediate(left));
} else if (right.is(left_arg) && IsOperationCommutative()) {
__ mov(right_arg, Immediate(left));
SetArgsReversed();
} else {
// For non-commutative operations, right and left_arg might be
// the same register. Therefore, the order of the moves is
// important here in order to not overwrite right before moving
// it to right_arg.
__ mov(right_arg, right);
__ mov(left_arg, Immediate(left));
}
// Update flags to indicate that arguments are in registers.
SetArgsInRegisters();
__ IncrementCounter(&Counters::generic_binary_stub_calls_regs, 1);
}
// Call the stub.
__ CallStub(this);
}
class FloatingPointHelper : public AllStatic {
public:
enum ArgLocation {
ARGS_ON_STACK,
ARGS_IN_REGISTERS
};
// Code pattern for loading a floating point value. Input value must
// be either a smi or a heap number object (fp value). Requirements:
// operand in register number. Returns operand as floating point number
// on FPU stack.
static void LoadFloatOperand(MacroAssembler* masm, Register number);
// Code pattern for loading floating point values. Input values must
// be either smi or heap number objects (fp values). Requirements:
// operand_1 on TOS+1 or in edx, operand_2 on TOS+2 or in eax.
// Returns operands as floating point numbers on FPU stack.
static void LoadFloatOperands(MacroAssembler* masm,
Register scratch,
ArgLocation arg_location = ARGS_ON_STACK);
// Similar to LoadFloatOperand but assumes that both operands are smis.
// Expects operands in edx, eax.
static void LoadFloatSmis(MacroAssembler* masm, Register scratch);
// Test if operands are smi or number objects (fp). Requirements:
// operand_1 in eax, operand_2 in edx; falls through on float
// operands, jumps to the non_float label otherwise.
static void CheckFloatOperands(MacroAssembler* masm,
Label* non_float,
Register scratch);
// Takes the operands in edx and eax and loads them as integers in eax
// and ecx.
static void LoadAsIntegers(MacroAssembler* masm,
TypeInfo type_info,
bool use_sse3,
Label* operand_conversion_failure);
static void LoadNumbersAsIntegers(MacroAssembler* masm,
TypeInfo type_info,
bool use_sse3,
Label* operand_conversion_failure);
static void LoadUnknownsAsIntegers(MacroAssembler* masm,
bool use_sse3,
Label* operand_conversion_failure);
// Test if operands are smis or heap numbers and load them
// into xmm0 and xmm1 if they are. Operands are in edx and eax.
// Leaves operands unchanged.
static void LoadSSE2Operands(MacroAssembler* masm);
// Test if operands are numbers (smi or HeapNumber objects), and load
// them into xmm0 and xmm1 if they are. Jump to label not_numbers if
// either operand is not a number. Operands are in edx and eax.
// Leaves operands unchanged.
static void LoadSSE2Operands(MacroAssembler* masm, Label* not_numbers);
// Similar to LoadSSE2Operands but assumes that both operands are smis.
// Expects operands in edx, eax.
static void LoadSSE2Smis(MacroAssembler* masm, Register scratch);
};
void GenericBinaryOpStub::GenerateSmiCode(MacroAssembler* masm, Label* slow) {
// 1. Move arguments into edx, eax except for DIV and MOD, which need the
// dividend in eax and edx free for the division. Use eax, ebx for those.
Comment load_comment(masm, "-- Load arguments");
Register left = edx;
Register right = eax;
if (op_ == Token::DIV || op_ == Token::MOD) {
left = eax;
right = ebx;
if (HasArgsInRegisters()) {
__ mov(ebx, eax);
__ mov(eax, edx);
}
}
if (!HasArgsInRegisters()) {
__ mov(right, Operand(esp, 1 * kPointerSize));
__ mov(left, Operand(esp, 2 * kPointerSize));
}
if (static_operands_type_.IsSmi()) {
if (FLAG_debug_code) {
__ AbortIfNotSmi(left);
__ AbortIfNotSmi(right);
}
if (op_ == Token::BIT_OR) {
__ or_(right, Operand(left));
GenerateReturn(masm);
return;
} else if (op_ == Token::BIT_AND) {
__ and_(right, Operand(left));
GenerateReturn(masm);
return;
} else if (op_ == Token::BIT_XOR) {
__ xor_(right, Operand(left));
GenerateReturn(masm);
return;
}
}
// 2. Prepare the smi check of both operands by oring them together.
Comment smi_check_comment(masm, "-- Smi check arguments");
Label not_smis;
Register combined = ecx;
ASSERT(!left.is(combined) && !right.is(combined));
switch (op_) {
case Token::BIT_OR:
// Perform the operation into eax and smi check the result. Preserve
// eax in case the result is not a smi.
ASSERT(!left.is(ecx) && !right.is(ecx));
__ mov(ecx, right);
__ or_(right, Operand(left)); // Bitwise or is commutative.
combined = right;
break;
case Token::BIT_XOR:
case Token::BIT_AND:
case Token::ADD:
case Token::SUB:
case Token::MUL:
case Token::DIV:
case Token::MOD:
__ mov(combined, right);
__ or_(combined, Operand(left));
break;
case Token::SHL:
case Token::SAR:
case Token::SHR:
// Move the right operand into ecx for the shift operation, use eax
// for the smi check register.
ASSERT(!left.is(ecx) && !right.is(ecx));
__ mov(ecx, right);
__ or_(right, Operand(left));
combined = right;
break;
default:
break;
}
// 3. Perform the smi check of the operands.
STATIC_ASSERT(kSmiTag == 0); // Adjust zero check if not the case.
__ test(combined, Immediate(kSmiTagMask));
__ j(not_zero, &not_smis, not_taken);
// 4. Operands are both smis, perform the operation leaving the result in
// eax and check the result if necessary.
Comment perform_smi(masm, "-- Perform smi operation");
Label use_fp_on_smis;
switch (op_) {
case Token::BIT_OR:
// Nothing to do.
break;
case Token::BIT_XOR:
ASSERT(right.is(eax));
__ xor_(right, Operand(left)); // Bitwise xor is commutative.
break;
case Token::BIT_AND:
ASSERT(right.is(eax));
__ and_(right, Operand(left)); // Bitwise and is commutative.
break;
case Token::SHL:
// Remove tags from operands (but keep sign).
__ SmiUntag(left);
__ SmiUntag(ecx);
// Perform the operation.
__ shl_cl(left);
// Check that the *signed* result fits in a smi.
__ cmp(left, 0xc0000000);
__ j(sign, &use_fp_on_smis, not_taken);
// Tag the result and store it in register eax.
__ SmiTag(left);
__ mov(eax, left);
break;
case Token::SAR:
// Remove tags from operands (but keep sign).
__ SmiUntag(left);
__ SmiUntag(ecx);
// Perform the operation.
__ sar_cl(left);
// Tag the result and store it in register eax.
__ SmiTag(left);
__ mov(eax, left);
break;
case Token::SHR:
// Remove tags from operands (but keep sign).
__ SmiUntag(left);
__ SmiUntag(ecx);
// Perform the operation.
__ shr_cl(left);
// Check that the *unsigned* result fits in a smi.
// Neither of the two high-order bits can be set:
// - 0x80000000: high bit would be lost when smi tagging.
// - 0x40000000: this number would convert to negative when
// Smi tagging these two cases can only happen with shifts
// by 0 or 1 when handed a valid smi.
__ test(left, Immediate(0xc0000000));
__ j(not_zero, slow, not_taken);
// Tag the result and store it in register eax.
__ SmiTag(left);
__ mov(eax, left);
break;
case Token::ADD:
ASSERT(right.is(eax));
__ add(right, Operand(left)); // Addition is commutative.
__ j(overflow, &use_fp_on_smis, not_taken);
break;
case Token::SUB:
__ sub(left, Operand(right));
__ j(overflow, &use_fp_on_smis, not_taken);
__ mov(eax, left);
break;
case Token::MUL:
// If the smi tag is 0 we can just leave the tag on one operand.
STATIC_ASSERT(kSmiTag == 0); // Adjust code below if not the case.
// We can't revert the multiplication if the result is not a smi
// so save the right operand.
__ mov(ebx, right);
// Remove tag from one of the operands (but keep sign).
__ SmiUntag(right);
// Do multiplication.
__ imul(right, Operand(left)); // Multiplication is commutative.
__ j(overflow, &use_fp_on_smis, not_taken);
// Check for negative zero result. Use combined = left | right.
__ NegativeZeroTest(right, combined, &use_fp_on_smis);
break;
case Token::DIV:
// We can't revert the division if the result is not a smi so
// save the left operand.
__ mov(edi, left);
// Check for 0 divisor.
__ test(right, Operand(right));
__ j(zero, &use_fp_on_smis, not_taken);
// Sign extend left into edx:eax.
ASSERT(left.is(eax));
__ cdq();
// Divide edx:eax by right.
__ idiv(right);
// Check for the corner case of dividing the most negative smi by
// -1. We cannot use the overflow flag, since it is not set by idiv
// instruction.
STATIC_ASSERT(kSmiTag == 0 && kSmiTagSize == 1);
__ cmp(eax, 0x40000000);
__ j(equal, &use_fp_on_smis);
// Check for negative zero result. Use combined = left | right.
__ NegativeZeroTest(eax, combined, &use_fp_on_smis);
// Check that the remainder is zero.
__ test(edx, Operand(edx));
__ j(not_zero, &use_fp_on_smis);
// Tag the result and store it in register eax.
__ SmiTag(eax);
break;
case Token::MOD:
// Check for 0 divisor.
__ test(right, Operand(right));
__ j(zero, &not_smis, not_taken);
// Sign extend left into edx:eax.
ASSERT(left.is(eax));
__ cdq();
// Divide edx:eax by right.
__ idiv(right);
// Check for negative zero result. Use combined = left | right.
__ NegativeZeroTest(edx, combined, slow);
// Move remainder to register eax.
__ mov(eax, edx);
break;
default:
UNREACHABLE();
}
// 5. Emit return of result in eax.
GenerateReturn(masm);
// 6. For some operations emit inline code to perform floating point
// operations on known smis (e.g., if the result of the operation
// overflowed the smi range).
switch (op_) {
case Token::SHL: {
Comment perform_float(masm, "-- Perform float operation on smis");
__ bind(&use_fp_on_smis);
// Result we want is in left == edx, so we can put the allocated heap
// number in eax.
__ AllocateHeapNumber(eax, ecx, ebx, slow);
// Store the result in the HeapNumber and return.
if (CpuFeatures::IsSupported(SSE2)) {
CpuFeatures::Scope use_sse2(SSE2);
__ cvtsi2sd(xmm0, Operand(left));
__ movdbl(FieldOperand(eax, HeapNumber::kValueOffset), xmm0);
} else {
// It's OK to overwrite the right argument on the stack because we
// are about to return.
__ mov(Operand(esp, 1 * kPointerSize), left);
__ fild_s(Operand(esp, 1 * kPointerSize));
__ fstp_d(FieldOperand(eax, HeapNumber::kValueOffset));
}
GenerateReturn(masm);
break;
}
case Token::ADD:
case Token::SUB:
case Token::MUL:
case Token::DIV: {
Comment perform_float(masm, "-- Perform float operation on smis");
__ bind(&use_fp_on_smis);
// Restore arguments to edx, eax.
switch (op_) {
case Token::ADD:
// Revert right = right + left.
__ sub(right, Operand(left));
break;
case Token::SUB:
// Revert left = left - right.
__ add(left, Operand(right));
break;
case Token::MUL:
// Right was clobbered but a copy is in ebx.
__ mov(right, ebx);
break;
case Token::DIV:
// Left was clobbered but a copy is in edi. Right is in ebx for
// division.
__ mov(edx, edi);
__ mov(eax, right);
break;
default: UNREACHABLE();
break;
}
__ AllocateHeapNumber(ecx, ebx, no_reg, slow);
if (CpuFeatures::IsSupported(SSE2)) {
CpuFeatures::Scope use_sse2(SSE2);
FloatingPointHelper::LoadSSE2Smis(masm, ebx);
switch (op_) {
case Token::ADD: __ addsd(xmm0, xmm1); break;
case Token::SUB: __ subsd(xmm0, xmm1); break;
case Token::MUL: __ mulsd(xmm0, xmm1); break;
case Token::DIV: __ divsd(xmm0, xmm1); break;
default: UNREACHABLE();
}
__ movdbl(FieldOperand(ecx, HeapNumber::kValueOffset), xmm0);
} else { // SSE2 not available, use FPU.
FloatingPointHelper::LoadFloatSmis(masm, ebx);
switch (op_) {
case Token::ADD: __ faddp(1); break;
case Token::SUB: __ fsubp(1); break;
case Token::MUL: __ fmulp(1); break;
case Token::DIV: __ fdivp(1); break;
default: UNREACHABLE();
}
__ fstp_d(FieldOperand(ecx, HeapNumber::kValueOffset));
}
__ mov(eax, ecx);
GenerateReturn(masm);
break;
}
default:
break;
}
// 7. Non-smi operands, fall out to the non-smi code with the operands in
// edx and eax.
Comment done_comment(masm, "-- Enter non-smi code");
__ bind(&not_smis);
switch (op_) {
case Token::BIT_OR:
case Token::SHL:
case Token::SAR:
case Token::SHR:
// Right operand is saved in ecx and eax was destroyed by the smi
// check.
__ mov(eax, ecx);
break;
case Token::DIV:
case Token::MOD:
// Operands are in eax, ebx at this point.
__ mov(edx, eax);
__ mov(eax, ebx);
break;
default:
break;
}
}
void GenericBinaryOpStub::Generate(MacroAssembler* masm) {
Label call_runtime;
__ IncrementCounter(&Counters::generic_binary_stub_calls, 1);
// Generate fast case smi code if requested. This flag is set when the fast
// case smi code is not generated by the caller. Generating it here will speed
// up common operations.
if (ShouldGenerateSmiCode()) {
GenerateSmiCode(masm, &call_runtime);
} else if (op_ != Token::MOD) { // MOD goes straight to runtime.
if (!HasArgsInRegisters()) {
GenerateLoadArguments(masm);
}
}
// Floating point case.
if (ShouldGenerateFPCode()) {
switch (op_) {
case Token::ADD:
case Token::SUB:
case Token::MUL:
case Token::DIV: {
if (runtime_operands_type_ == BinaryOpIC::DEFAULT &&
HasSmiCodeInStub()) {
// Execution reaches this point when the first non-smi argument occurs
// (and only if smi code is generated). This is the right moment to
// patch to HEAP_NUMBERS state. The transition is attempted only for
// the four basic operations. The stub stays in the DEFAULT state
// forever for all other operations (also if smi code is skipped).
GenerateTypeTransition(masm);
break;
}
Label not_floats;
if (CpuFeatures::IsSupported(SSE2)) {
CpuFeatures::Scope use_sse2(SSE2);
if (static_operands_type_.IsNumber()) {
if (FLAG_debug_code) {
// Assert at runtime that inputs are only numbers.
__ AbortIfNotNumber(edx);
__ AbortIfNotNumber(eax);
}
if (static_operands_type_.IsSmi()) {
if (FLAG_debug_code) {
__ AbortIfNotSmi(edx);
__ AbortIfNotSmi(eax);
}
FloatingPointHelper::LoadSSE2Smis(masm, ecx);
} else {
FloatingPointHelper::LoadSSE2Operands(masm);
}
} else {
FloatingPointHelper::LoadSSE2Operands(masm, &not_floats);
}
switch (op_) {
case Token::ADD: __ addsd(xmm0, xmm1); break;
case Token::SUB: __ subsd(xmm0, xmm1); break;
case Token::MUL: __ mulsd(xmm0, xmm1); break;
case Token::DIV: __ divsd(xmm0, xmm1); break;
default: UNREACHABLE();
}
GenerateHeapResultAllocation(masm, &call_runtime);
__ movdbl(FieldOperand(eax, HeapNumber::kValueOffset), xmm0);
GenerateReturn(masm);
} else { // SSE2 not available, use FPU.
if (static_operands_type_.IsNumber()) {
if (FLAG_debug_code) {
// Assert at runtime that inputs are only numbers.
__ AbortIfNotNumber(edx);
__ AbortIfNotNumber(eax);
}
} else {
FloatingPointHelper::CheckFloatOperands(masm, &not_floats, ebx);
}
FloatingPointHelper::LoadFloatOperands(
masm,
ecx,
FloatingPointHelper::ARGS_IN_REGISTERS);
switch (op_) {
case Token::ADD: __ faddp(1); break;
case Token::SUB: __ fsubp(1); break;
case Token::MUL: __ fmulp(1); break;
case Token::DIV: __ fdivp(1); break;
default: UNREACHABLE();
}
Label after_alloc_failure;
GenerateHeapResultAllocation(masm, &after_alloc_failure);
__ fstp_d(FieldOperand(eax, HeapNumber::kValueOffset));
GenerateReturn(masm);
__ bind(&after_alloc_failure);
__ ffree();
__ jmp(&call_runtime);
}
__ bind(&not_floats);
if (runtime_operands_type_ == BinaryOpIC::DEFAULT &&
!HasSmiCodeInStub()) {
// Execution reaches this point when the first non-number argument
// occurs (and only if smi code is skipped from the stub, otherwise
// the patching has already been done earlier in this case branch).
// Try patching to STRINGS for ADD operation.
if (op_ == Token::ADD) {
GenerateTypeTransition(masm);
}
}
break;
}
case Token::MOD: {
// For MOD we go directly to runtime in the non-smi case.
break;
}
case Token::BIT_OR:
case Token::BIT_AND:
case Token::BIT_XOR:
case Token::SAR:
case Token::SHL:
case Token::SHR: {
Label non_smi_result;
FloatingPointHelper::LoadAsIntegers(masm,
static_operands_type_,
use_sse3_,
&call_runtime);
switch (op_) {
case Token::BIT_OR: __ or_(eax, Operand(ecx)); break;
case Token::BIT_AND: __ and_(eax, Operand(ecx)); break;
case Token::BIT_XOR: __ xor_(eax, Operand(ecx)); break;
case Token::SAR: __ sar_cl(eax); break;
case Token::SHL: __ shl_cl(eax); break;
case Token::SHR: __ shr_cl(eax); break;
default: UNREACHABLE();
}
if (op_ == Token::SHR) {
// Check if result is non-negative and fits in a smi.
__ test(eax, Immediate(0xc0000000));
__ j(not_zero, &call_runtime);
} else {
// Check if result fits in a smi.
__ cmp(eax, 0xc0000000);
__ j(negative, &non_smi_result);
}
// Tag smi result and return.
__ SmiTag(eax);
GenerateReturn(masm);
// All ops except SHR return a signed int32 that we load in
// a HeapNumber.
if (op_ != Token::SHR) {
__ bind(&non_smi_result);
// Allocate a heap number if needed.
__ mov(ebx, Operand(eax)); // ebx: result
Label skip_allocation;
switch (mode_) {
case OVERWRITE_LEFT:
case OVERWRITE_RIGHT:
// If the operand was an object, we skip the
// allocation of a heap number.
__ mov(eax, Operand(esp, mode_ == OVERWRITE_RIGHT ?
1 * kPointerSize : 2 * kPointerSize));
__ test(eax, Immediate(kSmiTagMask));
__ j(not_zero, &skip_allocation, not_taken);
// Fall through!
case NO_OVERWRITE:
__ AllocateHeapNumber(eax, ecx, edx, &call_runtime);
__ bind(&skip_allocation);
break;
default: UNREACHABLE();
}
// Store the result in the HeapNumber and return.
if (CpuFeatures::IsSupported(SSE2)) {
CpuFeatures::Scope use_sse2(SSE2);
__ cvtsi2sd(xmm0, Operand(ebx));
__ movdbl(FieldOperand(eax, HeapNumber::kValueOffset), xmm0);
} else {
__ mov(Operand(esp, 1 * kPointerSize), ebx);
__ fild_s(Operand(esp, 1 * kPointerSize));
__ fstp_d(FieldOperand(eax, HeapNumber::kValueOffset));
}
GenerateReturn(masm);
}
break;
}
default: UNREACHABLE(); break;
}
}
// If all else fails, use the runtime system to get the correct
// result. If arguments was passed in registers now place them on the
// stack in the correct order below the return address.
// Avoid hitting the string ADD code below when allocation fails in
// the floating point code above.
if (op_ != Token::ADD) {
__ bind(&call_runtime);
}
if (HasArgsInRegisters()) {
GenerateRegisterArgsPush(masm);
}
switch (op_) {
case Token::ADD: {
// Test for string arguments before calling runtime.
// If this stub has already generated FP-specific code then the arguments
// are already in edx, eax
if (!ShouldGenerateFPCode() && !HasArgsInRegisters()) {
GenerateLoadArguments(masm);
}
// Registers containing left and right operands respectively.
Register lhs, rhs;
if (HasArgsReversed()) {
lhs = eax;
rhs = edx;
} else {
lhs = edx;
rhs = eax;
}
// Test if left operand is a string.
Label lhs_not_string;
__ test(lhs, Immediate(kSmiTagMask));
__ j(zero, &lhs_not_string);
__ CmpObjectType(lhs, FIRST_NONSTRING_TYPE, ecx);
__ j(above_equal, &lhs_not_string);
StringAddStub string_add_left_stub(NO_STRING_CHECK_LEFT_IN_STUB);
__ TailCallStub(&string_add_left_stub);
Label call_runtime_with_args;
// Left operand is not a string, test right.
__ bind(&lhs_not_string);
__ test(rhs, Immediate(kSmiTagMask));
__ j(zero, &call_runtime_with_args);
__ CmpObjectType(rhs, FIRST_NONSTRING_TYPE, ecx);
__ j(above_equal, &call_runtime_with_args);
StringAddStub string_add_right_stub(NO_STRING_CHECK_RIGHT_IN_STUB);
__ TailCallStub(&string_add_right_stub);
// Neither argument is a string.
__ bind(&call_runtime);
if (HasArgsInRegisters()) {
GenerateRegisterArgsPush(masm);
}
__ bind(&call_runtime_with_args);
__ InvokeBuiltin(Builtins::ADD, JUMP_FUNCTION);
break;
}
case Token::SUB:
__ InvokeBuiltin(Builtins::SUB, JUMP_FUNCTION);
break;
case Token::MUL:
__ InvokeBuiltin(Builtins::MUL, JUMP_FUNCTION);
break;
case Token::DIV:
__ InvokeBuiltin(Builtins::DIV, JUMP_FUNCTION);
break;
case Token::MOD:
__ InvokeBuiltin(Builtins::MOD, JUMP_FUNCTION);
break;
case Token::BIT_OR:
__ InvokeBuiltin(Builtins::BIT_OR, JUMP_FUNCTION);
break;
case Token::BIT_AND:
__ InvokeBuiltin(Builtins::BIT_AND, JUMP_FUNCTION);
break;
case Token::BIT_XOR:
__ InvokeBuiltin(Builtins::BIT_XOR, JUMP_FUNCTION);
break;
case Token::SAR:
__ InvokeBuiltin(Builtins::SAR, JUMP_FUNCTION);
break;
case Token::SHL:
__ InvokeBuiltin(Builtins::SHL, JUMP_FUNCTION);
break;
case Token::SHR:
__ InvokeBuiltin(Builtins::SHR, JUMP_FUNCTION);
break;
default:
UNREACHABLE();
}
}
void GenericBinaryOpStub::GenerateHeapResultAllocation(MacroAssembler* masm,
Label* alloc_failure) {
Label skip_allocation;
OverwriteMode mode = mode_;
if (HasArgsReversed()) {
if (mode == OVERWRITE_RIGHT) {
mode = OVERWRITE_LEFT;
} else if (mode == OVERWRITE_LEFT) {
mode = OVERWRITE_RIGHT;
}
}
switch (mode) {
case OVERWRITE_LEFT: {
// If the argument in edx is already an object, we skip the
// allocation of a heap number.
__ test(edx, Immediate(kSmiTagMask));
__ j(not_zero, &skip_allocation, not_taken);
// Allocate a heap number for the result. Keep eax and edx intact
// for the possible runtime call.
__ AllocateHeapNumber(ebx, ecx, no_reg, alloc_failure);
// Now edx can be overwritten losing one of the arguments as we are
// now done and will not need it any more.
__ mov(edx, Operand(ebx));
__ bind(&skip_allocation);
// Use object in edx as a result holder
__ mov(eax, Operand(edx));
break;
}
case OVERWRITE_RIGHT:
// If the argument in eax is already an object, we skip the
// allocation of a heap number.
__ test(eax, Immediate(kSmiTagMask));
__ j(not_zero, &skip_allocation, not_taken);
// Fall through!
case NO_OVERWRITE:
// Allocate a heap number for the result. Keep eax and edx intact
// for the possible runtime call.
__ AllocateHeapNumber(ebx, ecx, no_reg, alloc_failure);
// Now eax can be overwritten losing one of the arguments as we are
// now done and will not need it any more.
__ mov(eax, ebx);
__ bind(&skip_allocation);
break;
default: UNREACHABLE();
}
}
void GenericBinaryOpStub::GenerateLoadArguments(MacroAssembler* masm) {
// If arguments are not passed in registers read them from the stack.
ASSERT(!HasArgsInRegisters());
__ mov(eax, Operand(esp, 1 * kPointerSize));
__ mov(edx, Operand(esp, 2 * kPointerSize));
}
void GenericBinaryOpStub::GenerateReturn(MacroAssembler* masm) {
// If arguments are not passed in registers remove them from the stack before
// returning.
if (!HasArgsInRegisters()) {
__ ret(2 * kPointerSize); // Remove both operands
} else {
__ ret(0);
}
}
void GenericBinaryOpStub::GenerateRegisterArgsPush(MacroAssembler* masm) {
ASSERT(HasArgsInRegisters());
__ pop(ecx);
if (HasArgsReversed()) {
__ push(eax);
__ push(edx);
} else {
__ push(edx);
__ push(eax);
}
__ push(ecx);
}
void GenericBinaryOpStub::GenerateTypeTransition(MacroAssembler* masm) {
// Ensure the operands are on the stack.
if (HasArgsInRegisters()) {
GenerateRegisterArgsPush(masm);
}
__ pop(ecx); // Save return address.
// Left and right arguments are now on top.
// Push this stub's key. Although the operation and the type info are
// encoded into the key, the encoding is opaque, so push them too.
__ push(Immediate(Smi::FromInt(MinorKey())));
__ push(Immediate(Smi::FromInt(op_)));
__ push(Immediate(Smi::FromInt(runtime_operands_type_)));
__ push(ecx); // Push return address.
// Patch the caller to an appropriate specialized stub and return the
// operation result to the caller of the stub.
__ TailCallExternalReference(
ExternalReference(IC_Utility(IC::kBinaryOp_Patch)),
5,
1);
}
Handle<Code> GetBinaryOpStub(int key, BinaryOpIC::TypeInfo type_info) {
GenericBinaryOpStub stub(key, type_info);
return stub.GetCode();
}
void TranscendentalCacheStub::Generate(MacroAssembler* masm) {
// Input on stack:
// esp[4]: argument (should be number).
// esp[0]: return address.
// Test that eax is a number.
Label runtime_call;
Label runtime_call_clear_stack;
Label input_not_smi;
Label loaded;
__ mov(eax, Operand(esp, kPointerSize));
__ test(eax, Immediate(kSmiTagMask));
__ j(not_zero, &input_not_smi);
// Input is a smi. Untag and load it onto the FPU stack.
// Then load the low and high words of the double into ebx, edx.
STATIC_ASSERT(kSmiTagSize == 1);
__ sar(eax, 1);
__ sub(Operand(esp), Immediate(2 * kPointerSize));
__ mov(Operand(esp, 0), eax);
__ fild_s(Operand(esp, 0));
__ fst_d(Operand(esp, 0));
__ pop(edx);
__ pop(ebx);
__ jmp(&loaded);
__ bind(&input_not_smi);
// Check if input is a HeapNumber.
__ mov(ebx, FieldOperand(eax, HeapObject::kMapOffset));
__ cmp(Operand(ebx), Immediate(Factory::heap_number_map()));
__ j(not_equal, &runtime_call);
// Input is a HeapNumber. Push it on the FPU stack and load its
// low and high words into ebx, edx.
__ fld_d(FieldOperand(eax, HeapNumber::kValueOffset));
__ mov(edx, FieldOperand(eax, HeapNumber::kExponentOffset));
__ mov(ebx, FieldOperand(eax, HeapNumber::kMantissaOffset));
__ bind(&loaded);
// ST[0] == double value
// ebx = low 32 bits of double value
// edx = high 32 bits of double value
// Compute hash (the shifts are arithmetic):
// h = (low ^ high); h ^= h >> 16; h ^= h >> 8; h = h & (cacheSize - 1);
__ mov(ecx, ebx);
__ xor_(ecx, Operand(edx));
__ mov(eax, ecx);
__ sar(eax, 16);
__ xor_(ecx, Operand(eax));
__ mov(eax, ecx);
__ sar(eax, 8);
__ xor_(ecx, Operand(eax));
ASSERT(IsPowerOf2(TranscendentalCache::kCacheSize));
__ and_(Operand(ecx), Immediate(TranscendentalCache::kCacheSize - 1));
// ST[0] == double value.
// ebx = low 32 bits of double value.
// edx = high 32 bits of double value.
// ecx = TranscendentalCache::hash(double value).
__ mov(eax,
Immediate(ExternalReference::transcendental_cache_array_address()));
// Eax points to cache array.
__ mov(eax, Operand(eax, type_ * sizeof(TranscendentalCache::caches_[0])));
// Eax points to the cache for the type type_.
// If NULL, the cache hasn't been initialized yet, so go through runtime.
__ test(eax, Operand(eax));
__ j(zero, &runtime_call_clear_stack);
#ifdef DEBUG
// Check that the layout of cache elements match expectations.
{ TranscendentalCache::Element test_elem[2];
char* elem_start = reinterpret_cast<char*>(&test_elem[0]);
char* elem2_start = reinterpret_cast<char*>(&test_elem[1]);
char* elem_in0 = reinterpret_cast<char*>(&(test_elem[0].in[0]));
char* elem_in1 = reinterpret_cast<char*>(&(test_elem[0].in[1]));
char* elem_out = reinterpret_cast<char*>(&(test_elem[0].output));
CHECK_EQ(12, elem2_start - elem_start); // Two uint_32's and a pointer.
CHECK_EQ(0, elem_in0 - elem_start);
CHECK_EQ(kIntSize, elem_in1 - elem_start);
CHECK_EQ(2 * kIntSize, elem_out - elem_start);
}
#endif
// Find the address of the ecx'th entry in the cache, i.e., &eax[ecx*12].
__ lea(ecx, Operand(ecx, ecx, times_2, 0));
__ lea(ecx, Operand(eax, ecx, times_4, 0));
// Check if cache matches: Double value is stored in uint32_t[2] array.
Label cache_miss;
__ cmp(ebx, Operand(ecx, 0));
__ j(not_equal, &cache_miss);
__ cmp(edx, Operand(ecx, kIntSize));
__ j(not_equal, &cache_miss);
// Cache hit!
__ mov(eax, Operand(ecx, 2 * kIntSize));
__ fstp(0);
__ ret(kPointerSize);
__ bind(&cache_miss);
// Update cache with new value.
// We are short on registers, so use no_reg as scratch.
// This gives slightly larger code.
__ AllocateHeapNumber(eax, edi, no_reg, &runtime_call_clear_stack);
GenerateOperation(masm);
__ mov(Operand(ecx, 0), ebx);
__ mov(Operand(ecx, kIntSize), edx);
__ mov(Operand(ecx, 2 * kIntSize), eax);
__ fstp_d(FieldOperand(eax, HeapNumber::kValueOffset));
__ ret(kPointerSize);
__ bind(&runtime_call_clear_stack);
__ fstp(0);
__ bind(&runtime_call);
__ TailCallExternalReference(ExternalReference(RuntimeFunction()), 1, 1);
}
Runtime::FunctionId TranscendentalCacheStub::RuntimeFunction() {
switch (type_) {
// Add more cases when necessary.
case TranscendentalCache::SIN: return Runtime::kMath_sin;
case TranscendentalCache::COS: return Runtime::kMath_cos;
default:
UNIMPLEMENTED();
return Runtime::kAbort;
}
}
void TranscendentalCacheStub::GenerateOperation(MacroAssembler* masm) {
// Only free register is edi.
Label done;
ASSERT(type_ == TranscendentalCache::SIN ||
type_ == TranscendentalCache::COS);
// More transcendental types can be added later.
// Both fsin and fcos require arguments in the range +/-2^63 and
// return NaN for infinities and NaN. They can share all code except
// the actual fsin/fcos operation.
Label in_range;
// If argument is outside the range -2^63..2^63, fsin/cos doesn't
// work. We must reduce it to the appropriate range.
__ mov(edi, edx);
__ and_(Operand(edi), Immediate(0x7ff00000)); // Exponent only.
int supported_exponent_limit =
(63 + HeapNumber::kExponentBias) << HeapNumber::kExponentShift;
__ cmp(Operand(edi), Immediate(supported_exponent_limit));
__ j(below, &in_range, taken);
// Check for infinity and NaN. Both return NaN for sin.
__ cmp(Operand(edi), Immediate(0x7ff00000));
Label non_nan_result;
__ j(not_equal, &non_nan_result, taken);
// Input is +/-Infinity or NaN. Result is NaN.
__ fstp(0);
// NaN is represented by 0x7ff8000000000000.
__ push(Immediate(0x7ff80000));
__ push(Immediate(0));
__ fld_d(Operand(esp, 0));
__ add(Operand(esp), Immediate(2 * kPointerSize));
__ jmp(&done);
__ bind(&non_nan_result);
// Use fpmod to restrict argument to the range +/-2*PI.
__ mov(edi, eax); // Save eax before using fnstsw_ax.
__ fldpi();
__ fadd(0);
__ fld(1);
// FPU Stack: input, 2*pi, input.
{
Label no_exceptions;
__ fwait();
__ fnstsw_ax();
// Clear if Illegal Operand or Zero Division exceptions are set.
__ test(Operand(eax), Immediate(5));
__ j(zero, &no_exceptions);
__ fnclex();
__ bind(&no_exceptions);
}
// Compute st(0) % st(1)
{
Label partial_remainder_loop;
__ bind(&partial_remainder_loop);
__ fprem1();
__ fwait();
__ fnstsw_ax();
__ test(Operand(eax), Immediate(0x400 /* C2 */));
// If C2 is set, computation only has partial result. Loop to
// continue computation.
__ j(not_zero, &partial_remainder_loop);
}
// FPU Stack: input, 2*pi, input % 2*pi
__ fstp(2);
__ fstp(0);
__ mov(eax, edi); // Restore eax (allocated HeapNumber pointer).
// FPU Stack: input % 2*pi
__ bind(&in_range);
switch (type_) {
case TranscendentalCache::SIN:
__ fsin();
break;
case TranscendentalCache::COS:
__ fcos();
break;
default:
UNREACHABLE();
}
__ bind(&done);
}
// Get the integer part of a heap number. Surprisingly, all this bit twiddling
// is faster than using the built-in instructions on floating point registers.
// Trashes edi and ebx. Dest is ecx. Source cannot be ecx or one of the
// trashed registers.
void IntegerConvert(MacroAssembler* masm,
Register source,
TypeInfo type_info,
bool use_sse3,
Label* conversion_failure) {
ASSERT(!source.is(ecx) && !source.is(edi) && !source.is(ebx));
Label done, right_exponent, normal_exponent;
Register scratch = ebx;
Register scratch2 = edi;
if (type_info.IsInteger32() && CpuFeatures::IsEnabled(SSE2)) {
CpuFeatures::Scope scope(SSE2);
__ cvttsd2si(ecx, FieldOperand(source, HeapNumber::kValueOffset));
return;
}
if (!type_info.IsInteger32() || !use_sse3) {
// Get exponent word.
__ mov(scratch, FieldOperand(source, HeapNumber::kExponentOffset));
// Get exponent alone in scratch2.
__ mov(scratch2, scratch);
__ and_(scratch2, HeapNumber::kExponentMask);
}
if (use_sse3) {
CpuFeatures::Scope scope(SSE3);
if (!type_info.IsInteger32()) {
// Check whether the exponent is too big for a 64 bit signed integer.
static const uint32_t kTooBigExponent =
(HeapNumber::kExponentBias + 63) << HeapNumber::kExponentShift;
__ cmp(Operand(scratch2), Immediate(kTooBigExponent));
__ j(greater_equal, conversion_failure);
}
// Load x87 register with heap number.
__ fld_d(FieldOperand(source, HeapNumber::kValueOffset));
// Reserve space for 64 bit answer.
__ sub(Operand(esp), Immediate(sizeof(uint64_t))); // Nolint.
// Do conversion, which cannot fail because we checked the exponent.
__ fisttp_d(Operand(esp, 0));
__ mov(ecx, Operand(esp, 0)); // Load low word of answer into ecx.
__ add(Operand(esp), Immediate(sizeof(uint64_t))); // Nolint.
} else {
// Load ecx with zero. We use this either for the final shift or
// for the answer.
__ xor_(ecx, Operand(ecx));
// Check whether the exponent matches a 32 bit signed int that cannot be
// represented by a Smi. A non-smi 32 bit integer is 1.xxx * 2^30 so the
// exponent is 30 (biased). This is the exponent that we are fastest at and
// also the highest exponent we can handle here.
const uint32_t non_smi_exponent =
(HeapNumber::kExponentBias + 30) << HeapNumber::kExponentShift;
__ cmp(Operand(scratch2), Immediate(non_smi_exponent));
// If we have a match of the int32-but-not-Smi exponent then skip some
// logic.
__ j(equal, &right_exponent);
// If the exponent is higher than that then go to slow case. This catches
// numbers that don't fit in a signed int32, infinities and NaNs.
__ j(less, &normal_exponent);
{
// Handle a big exponent. The only reason we have this code is that the
// >>> operator has a tendency to generate numbers with an exponent of 31.
const uint32_t big_non_smi_exponent =
(HeapNumber::kExponentBias + 31) << HeapNumber::kExponentShift;
__ cmp(Operand(scratch2), Immediate(big_non_smi_exponent));
__ j(not_equal, conversion_failure);
// We have the big exponent, typically from >>>. This means the number is
// in the range 2^31 to 2^32 - 1. Get the top bits of the mantissa.
__ mov(scratch2, scratch);
__ and_(scratch2, HeapNumber::kMantissaMask);
// Put back the implicit 1.
__ or_(scratch2, 1 << HeapNumber::kExponentShift);
// Shift up the mantissa bits to take up the space the exponent used to
// take. We just orred in the implicit bit so that took care of one and
// we want to use the full unsigned range so we subtract 1 bit from the
// shift distance.
const int big_shift_distance = HeapNumber::kNonMantissaBitsInTopWord - 1;
__ shl(scratch2, big_shift_distance);
// Get the second half of the double.
__ mov(ecx, FieldOperand(source, HeapNumber::kMantissaOffset));
// Shift down 21 bits to get the most significant 11 bits or the low
// mantissa word.
__ shr(ecx, 32 - big_shift_distance);
__ or_(ecx, Operand(scratch2));
// We have the answer in ecx, but we may need to negate it.
__ test(scratch, Operand(scratch));
__ j(positive, &done);
__ neg(ecx);
__ jmp(&done);
}
__ bind(&normal_exponent);
// Exponent word in scratch, exponent part of exponent word in scratch2.
// Zero in ecx.
// We know the exponent is smaller than 30 (biased). If it is less than
// 0 (biased) then the number is smaller in magnitude than 1.0 * 2^0, ie
// it rounds to zero.
const uint32_t zero_exponent =
(HeapNumber::kExponentBias + 0) << HeapNumber::kExponentShift;
__ sub(Operand(scratch2), Immediate(zero_exponent));
// ecx already has a Smi zero.
__ j(less, &done);
// We have a shifted exponent between 0 and 30 in scratch2.
__ shr(scratch2, HeapNumber::kExponentShift);
__ mov(ecx, Immediate(30));
__ sub(ecx, Operand(scratch2));
__ bind(&right_exponent);
// Here ecx is the shift, scratch is the exponent word.
// Get the top bits of the mantissa.
__ and_(scratch, HeapNumber::kMantissaMask);
// Put back the implicit 1.
__ or_(scratch, 1 << HeapNumber::kExponentShift);
// Shift up the mantissa bits to take up the space the exponent used to
// take. We have kExponentShift + 1 significant bits int he low end of the
// word. Shift them to the top bits.
const int shift_distance = HeapNumber::kNonMantissaBitsInTopWord - 2;
__ shl(scratch, shift_distance);
// Get the second half of the double. For some exponents we don't
// actually need this because the bits get shifted out again, but
// it's probably slower to test than just to do it.
__ mov(scratch2, FieldOperand(source, HeapNumber::kMantissaOffset));
// Shift down 22 bits to get the most significant 10 bits or the low
// mantissa word.
__ shr(scratch2, 32 - shift_distance);
__ or_(scratch2, Operand(scratch));
// Move down according to the exponent.
__ shr_cl(scratch2);
// Now the unsigned answer is in scratch2. We need to move it to ecx and
// we may need to fix the sign.
Label negative;
__ xor_(ecx, Operand(ecx));
__ cmp(ecx, FieldOperand(source, HeapNumber::kExponentOffset));
__ j(greater, &negative);
__ mov(ecx, scratch2);
__ jmp(&done);
__ bind(&negative);
__ sub(ecx, Operand(scratch2));
__ bind(&done);
}
}
// Input: edx, eax are the left and right objects of a bit op.
// Output: eax, ecx are left and right integers for a bit op.
void FloatingPointHelper::LoadNumbersAsIntegers(MacroAssembler* masm,
TypeInfo type_info,
bool use_sse3,
Label* conversion_failure) {
// Check float operands.
Label arg1_is_object, check_undefined_arg1;
Label arg2_is_object, check_undefined_arg2;
Label load_arg2, done;
if (!type_info.IsDouble()) {
if (!type_info.IsSmi()) {
__ test(edx, Immediate(kSmiTagMask));
__ j(not_zero, &arg1_is_object);
} else {
if (FLAG_debug_code) __ AbortIfNotSmi(edx);
}
__ SmiUntag(edx);
__ jmp(&load_arg2);
}
__ bind(&arg1_is_object);
// Get the untagged integer version of the edx heap number in ecx.
IntegerConvert(masm, edx, type_info, use_sse3, conversion_failure);
__ mov(edx, ecx);
// Here edx has the untagged integer, eax has a Smi or a heap number.
__ bind(&load_arg2);
if (!type_info.IsDouble()) {
// Test if arg2 is a Smi.
if (!type_info.IsSmi()) {
__ test(eax, Immediate(kSmiTagMask));
__ j(not_zero, &arg2_is_object);
} else {
if (FLAG_debug_code) __ AbortIfNotSmi(eax);
}
__ SmiUntag(eax);
__ mov(ecx, eax);
__ jmp(&done);
}
__ bind(&arg2_is_object);
// Get the untagged integer version of the eax heap number in ecx.
IntegerConvert(masm, eax, type_info, use_sse3, conversion_failure);
__ bind(&done);
__ mov(eax, edx);
}
// Input: edx, eax are the left and right objects of a bit op.
// Output: eax, ecx are left and right integers for a bit op.
void FloatingPointHelper::LoadUnknownsAsIntegers(MacroAssembler* masm,
bool use_sse3,
Label* conversion_failure) {
// Check float operands.
Label arg1_is_object, check_undefined_arg1;
Label arg2_is_object, check_undefined_arg2;
Label load_arg2, done;
// Test if arg1 is a Smi.
__ test(edx, Immediate(kSmiTagMask));
__ j(not_zero, &arg1_is_object);
__ SmiUntag(edx);
__ jmp(&load_arg2);
// If the argument is undefined it converts to zero (ECMA-262, section 9.5).
__ bind(&check_undefined_arg1);
__ cmp(edx, Factory::undefined_value());
__ j(not_equal, conversion_failure);
__ mov(edx, Immediate(0));
__ jmp(&load_arg2);
__ bind(&arg1_is_object);
__ mov(ebx, FieldOperand(edx, HeapObject::kMapOffset));
__ cmp(ebx, Factory::heap_number_map());
__ j(not_equal, &check_undefined_arg1);
// Get the untagged integer version of the edx heap number in ecx.
IntegerConvert(masm,
edx,
TypeInfo::Unknown(),
use_sse3,
conversion_failure);
__ mov(edx, ecx);
// Here edx has the untagged integer, eax has a Smi or a heap number.
__ bind(&load_arg2);
// Test if arg2 is a Smi.
__ test(eax, Immediate(kSmiTagMask));
__ j(not_zero, &arg2_is_object);
__ SmiUntag(eax);
__ mov(ecx, eax);
__ jmp(&done);
// If the argument is undefined it converts to zero (ECMA-262, section 9.5).
__ bind(&check_undefined_arg2);
__ cmp(eax, Factory::undefined_value());
__ j(not_equal, conversion_failure);
__ mov(ecx, Immediate(0));
__ jmp(&done);
__ bind(&arg2_is_object);
__ mov(ebx, FieldOperand(eax, HeapObject::kMapOffset));
__ cmp(ebx, Factory::heap_number_map());
__ j(not_equal, &check_undefined_arg2);
// Get the untagged integer version of the eax heap number in ecx.
IntegerConvert(masm,
eax,
TypeInfo::Unknown(),
use_sse3,
conversion_failure);
__ bind(&done);
__ mov(eax, edx);
}
void FloatingPointHelper::LoadAsIntegers(MacroAssembler* masm,
TypeInfo type_info,
bool use_sse3,
Label* conversion_failure) {
if (type_info.IsNumber()) {
LoadNumbersAsIntegers(masm, type_info, use_sse3, conversion_failure);
} else {
LoadUnknownsAsIntegers(masm, use_sse3, conversion_failure);
}
}
void FloatingPointHelper::LoadFloatOperand(MacroAssembler* masm,
Register number) {
Label load_smi, done;
__ test(number, Immediate(kSmiTagMask));
__ j(zero, &load_smi, not_taken);
__ fld_d(FieldOperand(number, HeapNumber::kValueOffset));
__ jmp(&done);
__ bind(&load_smi);
__ SmiUntag(number);
__ push(number);
__ fild_s(Operand(esp, 0));
__ pop(number);
__ bind(&done);
}
void FloatingPointHelper::LoadSSE2Operands(MacroAssembler* masm) {
Label load_smi_edx, load_eax, load_smi_eax, done;
// Load operand in edx into xmm0.
__ test(edx, Immediate(kSmiTagMask));
__ j(zero, &load_smi_edx, not_taken); // Argument in edx is a smi.
__ movdbl(xmm0, FieldOperand(edx, HeapNumber::kValueOffset));
__ bind(&load_eax);
// Load operand in eax into xmm1.
__ test(eax, Immediate(kSmiTagMask));
__ j(zero, &load_smi_eax, not_taken); // Argument in eax is a smi.
__ movdbl(xmm1, FieldOperand(eax, HeapNumber::kValueOffset));
__ jmp(&done);
__ bind(&load_smi_edx);
__ SmiUntag(edx); // Untag smi before converting to float.
__ cvtsi2sd(xmm0, Operand(edx));
__ SmiTag(edx); // Retag smi for heap number overwriting test.
__ jmp(&load_eax);
__ bind(&load_smi_eax);
__ SmiUntag(eax); // Untag smi before converting to float.
__ cvtsi2sd(xmm1, Operand(eax));
__ SmiTag(eax); // Retag smi for heap number overwriting test.
__ bind(&done);
}
void FloatingPointHelper::LoadSSE2Operands(MacroAssembler* masm,
Label* not_numbers) {
Label load_smi_edx, load_eax, load_smi_eax, load_float_eax, done;
// Load operand in edx into xmm0, or branch to not_numbers.
__ test(edx, Immediate(kSmiTagMask));
__ j(zero, &load_smi_edx, not_taken); // Argument in edx is a smi.
__ cmp(FieldOperand(edx, HeapObject::kMapOffset), Factory::heap_number_map());
__ j(not_equal, not_numbers); // Argument in edx is not a number.
__ movdbl(xmm0, FieldOperand(edx, HeapNumber::kValueOffset));
__ bind(&load_eax);
// Load operand in eax into xmm1, or branch to not_numbers.
__ test(eax, Immediate(kSmiTagMask));
__ j(zero, &load_smi_eax, not_taken); // Argument in eax is a smi.
__ cmp(FieldOperand(eax, HeapObject::kMapOffset), Factory::heap_number_map());
__ j(equal, &load_float_eax);
__ jmp(not_numbers); // Argument in eax is not a number.
__ bind(&load_smi_edx);
__ SmiUntag(edx); // Untag smi before converting to float.
__ cvtsi2sd(xmm0, Operand(edx));
__ SmiTag(edx); // Retag smi for heap number overwriting test.
__ jmp(&load_eax);
__ bind(&load_smi_eax);
__ SmiUntag(eax); // Untag smi before converting to float.
__ cvtsi2sd(xmm1, Operand(eax));
__ SmiTag(eax); // Retag smi for heap number overwriting test.
__ jmp(&done);
__ bind(&load_float_eax);
__ movdbl(xmm1, FieldOperand(eax, HeapNumber::kValueOffset));
__ bind(&done);
}
void FloatingPointHelper::LoadSSE2Smis(MacroAssembler* masm,
Register scratch) {
const Register left = edx;
const Register right = eax;
__ mov(scratch, left);
ASSERT(!scratch.is(right)); // We're about to clobber scratch.
__ SmiUntag(scratch);
__ cvtsi2sd(xmm0, Operand(scratch));
__ mov(scratch, right);
__ SmiUntag(scratch);
__ cvtsi2sd(xmm1, Operand(scratch));
}
void FloatingPointHelper::LoadFloatOperands(MacroAssembler* masm,
Register scratch,
ArgLocation arg_location) {
Label load_smi_1, load_smi_2, done_load_1, done;
if (arg_location == ARGS_IN_REGISTERS) {
__ mov(scratch, edx);
} else {
__ mov(scratch, Operand(esp, 2 * kPointerSize));
}
__ test(scratch, Immediate(kSmiTagMask));
__ j(zero, &load_smi_1, not_taken);
__ fld_d(FieldOperand(scratch, HeapNumber::kValueOffset));
__ bind(&done_load_1);
if (arg_location == ARGS_IN_REGISTERS) {
__ mov(scratch, eax);
} else {
__ mov(scratch, Operand(esp, 1 * kPointerSize));
}
__ test(scratch, Immediate(kSmiTagMask));
__ j(zero, &load_smi_2, not_taken);
__ fld_d(FieldOperand(scratch, HeapNumber::kValueOffset));
__ jmp(&done);
__ bind(&load_smi_1);
__ SmiUntag(scratch);
__ push(scratch);
__ fild_s(Operand(esp, 0));
__ pop(scratch);
__ jmp(&done_load_1);
__ bind(&load_smi_2);
__ SmiUntag(scratch);
__ push(scratch);
__ fild_s(Operand(esp, 0));
__ pop(scratch);
__ bind(&done);
}
void FloatingPointHelper::LoadFloatSmis(MacroAssembler* masm,
Register scratch) {
const Register left = edx;
const Register right = eax;
__ mov(scratch, left);
ASSERT(!scratch.is(right)); // We're about to clobber scratch.
__ SmiUntag(scratch);
__ push(scratch);
__ fild_s(Operand(esp, 0));
__ mov(scratch, right);
__ SmiUntag(scratch);
__ mov(Operand(esp, 0), scratch);
__ fild_s(Operand(esp, 0));
__ pop(scratch);
}
void FloatingPointHelper::CheckFloatOperands(MacroAssembler* masm,
Label* non_float,
Register scratch) {
Label test_other, done;
// Test if both operands are floats or smi -> scratch=k_is_float;
// Otherwise scratch = k_not_float.
__ test(edx, Immediate(kSmiTagMask));
__ j(zero, &test_other, not_taken); // argument in edx is OK
__ mov(scratch, FieldOperand(edx, HeapObject::kMapOffset));
__ cmp(scratch, Factory::heap_number_map());
__ j(not_equal, non_float); // argument in edx is not a number -> NaN
__ bind(&test_other);
__ test(eax, Immediate(kSmiTagMask));
__ j(zero, &done); // argument in eax is OK
__ mov(scratch, FieldOperand(eax, HeapObject::kMapOffset));
__ cmp(scratch, Factory::heap_number_map());
__ j(not_equal, non_float); // argument in eax is not a number -> NaN
// Fall-through: Both operands are numbers.
__ bind(&done);
}
void GenericUnaryOpStub::Generate(MacroAssembler* masm) {
Label slow, done;
if (op_ == Token::SUB) {
// Check whether the value is a smi.
Label try_float;
__ test(eax, Immediate(kSmiTagMask));
__ j(not_zero, &try_float, not_taken);
if (negative_zero_ == kStrictNegativeZero) {
// Go slow case if the value of the expression is zero
// to make sure that we switch between 0 and -0.
__ test(eax, Operand(eax));
__ j(zero, &slow, not_taken);
}
// The value of the expression is a smi that is not zero. Try
// optimistic subtraction '0 - value'.
Label undo;
__ mov(edx, Operand(eax));
__ Set(eax, Immediate(0));
__ sub(eax, Operand(edx));
__ j(no_overflow, &done, taken);
// Restore eax and go slow case.
__ bind(&undo);
__ mov(eax, Operand(edx));
__ jmp(&slow);
// Try floating point case.
__ bind(&try_float);
__ mov(edx, FieldOperand(eax, HeapObject::kMapOffset));
__ cmp(edx, Factory::heap_number_map());
__ j(not_equal, &slow);
if (overwrite_ == UNARY_OVERWRITE) {
__ mov(edx, FieldOperand(eax, HeapNumber::kExponentOffset));
__ xor_(edx, HeapNumber::kSignMask); // Flip sign.
__ mov(FieldOperand(eax, HeapNumber::kExponentOffset), edx);
} else {
__ mov(edx, Operand(eax));
// edx: operand
__ AllocateHeapNumber(eax, ebx, ecx, &undo);
// eax: allocated 'empty' number
__ mov(ecx, FieldOperand(edx, HeapNumber::kExponentOffset));
__ xor_(ecx, HeapNumber::kSignMask); // Flip sign.
__ mov(FieldOperand(eax, HeapNumber::kExponentOffset), ecx);
__ mov(ecx, FieldOperand(edx, HeapNumber::kMantissaOffset));
__ mov(FieldOperand(eax, HeapNumber::kMantissaOffset), ecx);
}
} else if (op_ == Token::BIT_NOT) {
// Check if the operand is a heap number.
__ mov(edx, FieldOperand(eax, HeapObject::kMapOffset));
__ cmp(edx, Factory::heap_number_map());
__ j(not_equal, &slow, not_taken);
// Convert the heap number in eax to an untagged integer in ecx.
IntegerConvert(masm,
eax,
TypeInfo::Unknown(),
CpuFeatures::IsSupported(SSE3),
&slow);
// Do the bitwise operation and check if the result fits in a smi.
Label try_float;
__ not_(ecx);
__ cmp(ecx, 0xc0000000);
__ j(sign, &try_float, not_taken);
// Tag the result as a smi and we're done.
STATIC_ASSERT(kSmiTagSize == 1);
__ lea(eax, Operand(ecx, times_2, kSmiTag));
__ jmp(&done);
// Try to store the result in a heap number.
__ bind(&try_float);
if (overwrite_ == UNARY_NO_OVERWRITE) {
// Allocate a fresh heap number, but don't overwrite eax until
// we're sure we can do it without going through the slow case
// that needs the value in eax.
__ AllocateHeapNumber(ebx, edx, edi, &slow);
__ mov(eax, Operand(ebx));
}
if (CpuFeatures::IsSupported(SSE2)) {
CpuFeatures::Scope use_sse2(SSE2);
__ cvtsi2sd(xmm0, Operand(ecx));
__ movdbl(FieldOperand(eax, HeapNumber::kValueOffset), xmm0);
} else {
__ push(ecx);
__ fild_s(Operand(esp, 0));
__ pop(ecx);
__ fstp_d(FieldOperand(eax, HeapNumber::kValueOffset));
}
} else {
UNIMPLEMENTED();
}
// Return from the stub.
__ bind(&done);
__ StubReturn(1);
// Handle the slow case by jumping to the JavaScript builtin.
__ bind(&slow);
__ pop(ecx); // pop return address.
__ push(eax);
__ push(ecx); // push return address
switch (op_) {
case Token::SUB:
__ InvokeBuiltin(Builtins::UNARY_MINUS, JUMP_FUNCTION);
break;
case Token::BIT_NOT:
__ InvokeBuiltin(Builtins::BIT_NOT, JUMP_FUNCTION);
break;
default:
UNREACHABLE();
}
}
void ArgumentsAccessStub::GenerateReadElement(MacroAssembler* masm) {
// The key is in edx and the parameter count is in eax.
// The displacement is used for skipping the frame pointer on the
// stack. It is the offset of the last parameter (if any) relative
// to the frame pointer.
static const int kDisplacement = 1 * kPointerSize;
// Check that the key is a smi.
Label slow;
__ test(edx, Immediate(kSmiTagMask));
__ j(not_zero, &slow, not_taken);
// Check if the calling frame is an arguments adaptor frame.
Label adaptor;
__ mov(ebx, Operand(ebp, StandardFrameConstants::kCallerFPOffset));
__ mov(ecx, Operand(ebx, StandardFrameConstants::kContextOffset));
__ cmp(Operand(ecx), Immediate(Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR)));
__ j(equal, &adaptor);
// Check index against formal parameters count limit passed in
// through register eax. Use unsigned comparison to get negative
// check for free.
__ cmp(edx, Operand(eax));
__ j(above_equal, &slow, not_taken);
// Read the argument from the stack and return it.
STATIC_ASSERT(kSmiTagSize == 1);
STATIC_ASSERT(kSmiTag == 0); // Shifting code depends on these.
__ lea(ebx, Operand(ebp, eax, times_2, 0));
__ neg(edx);
__ mov(eax, Operand(ebx, edx, times_2, kDisplacement));
__ ret(0);
// 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);
__ mov(ecx, Operand(ebx, ArgumentsAdaptorFrameConstants::kLengthOffset));
__ cmp(edx, Operand(ecx));
__ j(above_equal, &slow, not_taken);
// Read the argument from the stack and return it.
STATIC_ASSERT(kSmiTagSize == 1);
STATIC_ASSERT(kSmiTag == 0); // Shifting code depends on these.
__ lea(ebx, Operand(ebx, ecx, times_2, 0));
__ neg(edx);
__ mov(eax, Operand(ebx, edx, times_2, kDisplacement));
__ ret(0);
// Slow-case: Handle non-smi or out-of-bounds access to arguments
// by calling the runtime system.
__ bind(&slow);
__ pop(ebx); // Return address.
__ push(edx);
__ push(ebx);
__ TailCallRuntime(Runtime::kGetArgumentsProperty, 1, 1);
}
void ArgumentsAccessStub::GenerateNewObject(MacroAssembler* masm) {
// esp[0] : return address
// esp[4] : number of parameters
// esp[8] : receiver displacement
// esp[16] : function
// The displacement is used for skipping the return address and the
// frame pointer on the stack. It is the offset of the last
// parameter (if any) relative to the frame pointer.
static const int kDisplacement = 2 * kPointerSize;
// Check if the calling frame is an arguments adaptor frame.
Label adaptor_frame, try_allocate, runtime;
__ mov(edx, Operand(ebp, StandardFrameConstants::kCallerFPOffset));
__ mov(ecx, Operand(edx, StandardFrameConstants::kContextOffset));
__ cmp(Operand(ecx), Immediate(Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR)));
__ j(equal, &adaptor_frame);
// Get the length from the frame.
__ mov(ecx, Operand(esp, 1 * kPointerSize));
__ jmp(&try_allocate);
// Patch the arguments.length and the parameters pointer.
__ bind(&adaptor_frame);
__ mov(ecx, Operand(edx, ArgumentsAdaptorFrameConstants::kLengthOffset));
__ mov(Operand(esp, 1 * kPointerSize), ecx);
__ lea(edx, Operand(edx, ecx, times_2, kDisplacement));
__ mov(Operand(esp, 2 * kPointerSize), edx);
// 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);
__ test(ecx, Operand(ecx));
__ j(zero, &add_arguments_object);
__ lea(ecx, Operand(ecx, times_2, FixedArray::kHeaderSize));
__ bind(&add_arguments_object);
__ add(Operand(ecx), Immediate(Heap::kArgumentsObjectSize));
// Do the allocation of both objects in one go.
__ AllocateInNewSpace(ecx, eax, edx, ebx, &runtime, TAG_OBJECT);
// Get the arguments boilerplate from the current (global) context.
int offset = Context::SlotOffset(Context::ARGUMENTS_BOILERPLATE_INDEX);
__ mov(edi, Operand(esi, Context::SlotOffset(Context::GLOBAL_INDEX)));
__ mov(edi, FieldOperand(edi, GlobalObject::kGlobalContextOffset));
__ mov(edi, Operand(edi, offset));
// Copy the JS object part.
for (int i = 0; i < JSObject::kHeaderSize; i += kPointerSize) {
__ mov(ebx, FieldOperand(edi, i));
__ mov(FieldOperand(eax, i), ebx);
}
// Setup the callee in-object property.
STATIC_ASSERT(Heap::arguments_callee_index == 0);
__ mov(ebx, Operand(esp, 3 * kPointerSize));
__ mov(FieldOperand(eax, JSObject::kHeaderSize), ebx);
// Get the length (smi tagged) and set that as an in-object property too.
STATIC_ASSERT(Heap::arguments_length_index == 1);
__ mov(ecx, Operand(esp, 1 * kPointerSize));
__ mov(FieldOperand(eax, JSObject::kHeaderSize + kPointerSize), ecx);
// If there are no actual arguments, we're done.
Label done;
__ test(ecx, Operand(ecx));
__ j(zero, &done);
// Get the parameters pointer from the stack.
__ mov(edx, Operand(esp, 2 * kPointerSize));
// Setup the elements pointer in the allocated arguments object and
// initialize the header in the elements fixed array.
__ lea(edi, Operand(eax, Heap::kArgumentsObjectSize));
__ mov(FieldOperand(eax, JSObject::kElementsOffset), edi);
__ mov(FieldOperand(edi, FixedArray::kMapOffset),
Immediate(Factory::fixed_array_map()));
__ mov(FieldOperand(edi, FixedArray::kLengthOffset), ecx);
// Untag the length for the loop below.
__ SmiUntag(ecx);
// Copy the fixed array slots.
Label loop;
__ bind(&loop);
__ mov(ebx, Operand(edx, -1 * kPointerSize)); // Skip receiver.
__ mov(FieldOperand(edi, FixedArray::kHeaderSize), ebx);
__ add(Operand(edi), Immediate(kPointerSize));
__ sub(Operand(edx), Immediate(kPointerSize));
__ dec(ecx);
__ 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::kNewArgumentsFast, 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
if (!FLAG_regexp_entry_native) {
__ TailCallRuntime(Runtime::kRegExpExec, 4, 1);
return;
}
// Stack frame on entry.
// esp[0]: return address
// esp[4]: last_match_info (expected JSArray)
// esp[8]: previous index
// esp[12]: subject string
// esp[16]: JSRegExp object
static const int kLastMatchInfoOffset = 1 * kPointerSize;
static const int kPreviousIndexOffset = 2 * kPointerSize;
static const int kSubjectOffset = 3 * kPointerSize;
static const int kJSRegExpOffset = 4 * kPointerSize;
Label runtime, invoke_regexp;
// Ensure that a RegExp stack is allocated.
ExternalReference address_of_regexp_stack_memory_address =
ExternalReference::address_of_regexp_stack_memory_address();
ExternalReference address_of_regexp_stack_memory_size =
ExternalReference::address_of_regexp_stack_memory_size();
__ mov(ebx, Operand::StaticVariable(address_of_regexp_stack_memory_size));
__ test(ebx, Operand(ebx));
__ j(zero, &runtime, not_taken);
// Check that the first argument is a JSRegExp object.
__ mov(eax, Operand(esp, kJSRegExpOffset));
STATIC_ASSERT(kSmiTag == 0);
__ test(eax, Immediate(kSmiTagMask));
__ j(zero, &runtime);
__ CmpObjectType(eax, JS_REGEXP_TYPE, ecx);
__ j(not_equal, &runtime);
// Check that the RegExp has been compiled (data contains a fixed array).
__ mov(ecx, FieldOperand(eax, JSRegExp::kDataOffset));
if (FLAG_debug_code) {
__ test(ecx, Immediate(kSmiTagMask));
__ Check(not_zero, "Unexpected type for RegExp data, FixedArray expected");
__ CmpObjectType(ecx, FIXED_ARRAY_TYPE, ebx);
__ Check(equal, "Unexpected type for RegExp data, FixedArray expected");
}
// ecx: RegExp data (FixedArray)
// Check the type of the RegExp. Only continue if type is JSRegExp::IRREGEXP.
__ mov(ebx, FieldOperand(ecx, JSRegExp::kDataTagOffset));
__ cmp(Operand(ebx), Immediate(Smi::FromInt(JSRegExp::IRREGEXP)));
__ j(not_equal, &runtime);
// ecx: RegExp data (FixedArray)
// Check that the number of captures fit in the static offsets vector buffer.
__ mov(edx, FieldOperand(ecx, JSRegExp::kIrregexpCaptureCountOffset));
// Calculate number of capture registers (number_of_captures + 1) * 2. This
// uses the asumption that smis are 2 * their untagged value.
STATIC_ASSERT(kSmiTag == 0);
STATIC_ASSERT(kSmiTagSize + kSmiShiftSize == 1);
__ add(Operand(edx), Immediate(2)); // edx was a smi.
// Check that the static offsets vector buffer is large enough.
__ cmp(edx, OffsetsVector::kStaticOffsetsVectorSize);
__ j(above, &runtime);
// ecx: RegExp data (FixedArray)
// edx: Number of capture registers
// Check that the second argument is a string.
__ mov(eax, Operand(esp, kSubjectOffset));
__ test(eax, Immediate(kSmiTagMask));
__ j(zero, &runtime);
Condition is_string = masm->IsObjectStringType(eax, ebx, ebx);
__ j(NegateCondition(is_string), &runtime);
// Get the length of the string to ebx.
__ mov(ebx, FieldOperand(eax, String::kLengthOffset));
// ebx: Length of subject string as a smi
// ecx: RegExp data (FixedArray)
// edx: Number of capture registers
// Check that the third argument is a positive smi less than the subject
// string length. A negative value will be greater (unsigned comparison).
__ mov(eax, Operand(esp, kPreviousIndexOffset));
__ test(eax, Immediate(kSmiTagMask));
__ j(not_zero, &runtime);
__ cmp(eax, Operand(ebx));
__ j(above_equal, &runtime);
// ecx: RegExp data (FixedArray)
// edx: Number of capture registers
// Check that the fourth object is a JSArray object.
__ mov(eax, Operand(esp, kLastMatchInfoOffset));
__ test(eax, Immediate(kSmiTagMask));
__ j(zero, &runtime);
__ CmpObjectType(eax, JS_ARRAY_TYPE, ebx);
__ j(not_equal, &runtime);
// Check that the JSArray is in fast case.
__ mov(ebx, FieldOperand(eax, JSArray::kElementsOffset));
__ mov(eax, FieldOperand(ebx, HeapObject::kMapOffset));
__ cmp(eax, Factory::fixed_array_map());
__ j(not_equal, &runtime);
// Check that the last match info has space for the capture registers and the
// additional information.
__ mov(eax, FieldOperand(ebx, FixedArray::kLengthOffset));
__ SmiUntag(eax);
__ add(Operand(edx), Immediate(RegExpImpl::kLastMatchOverhead));
__ cmp(edx, Operand(eax));
__ j(greater, &runtime);
// ecx: RegExp data (FixedArray)
// Check the representation and encoding of the subject string.
Label seq_ascii_string, seq_two_byte_string, check_code;
__ mov(eax, Operand(esp, kSubjectOffset));
__ mov(ebx, FieldOperand(eax, HeapObject::kMapOffset));
__ movzx_b(ebx, FieldOperand(ebx, Map::kInstanceTypeOffset));
// First check for flat two byte string.
__ and_(ebx,
kIsNotStringMask | kStringRepresentationMask | kStringEncodingMask);
STATIC_ASSERT((kStringTag | kSeqStringTag | kTwoByteStringTag) == 0);
__ j(zero, &seq_two_byte_string);
// Any other flat string must be a flat ascii string.
__ test(Operand(ebx),
Immediate(kIsNotStringMask | kStringRepresentationMask));
__ j(zero, &seq_ascii_string);
// Check for flat cons string.
// A flat cons string is a cons string where the second part is the empty
// string. In that case the subject string is just the first part of the cons
// string. Also in this case the first part of the cons string is known to be
// a sequential string or an external string.
STATIC_ASSERT(kExternalStringTag != 0);
STATIC_ASSERT((kConsStringTag & kExternalStringTag) == 0);
__ test(Operand(ebx),
Immediate(kIsNotStringMask | kExternalStringTag));
__ j(not_zero, &runtime);
// String is a cons string.
__ mov(edx, FieldOperand(eax, ConsString::kSecondOffset));
__ cmp(Operand(edx), Factory::empty_string());
__ j(not_equal, &runtime);
__ mov(eax, FieldOperand(eax, ConsString::kFirstOffset));
__ mov(ebx, FieldOperand(eax, HeapObject::kMapOffset));
// String is a cons string with empty second part.
// eax: first part of cons string.
// ebx: map of first part of cons string.
// Is first part a flat two byte string?
__ test_b(FieldOperand(ebx, Map::kInstanceTypeOffset),
kStringRepresentationMask | kStringEncodingMask);
STATIC_ASSERT((kSeqStringTag | kTwoByteStringTag) == 0);
__ j(zero, &seq_two_byte_string);
// Any other flat string must be ascii.
__ test_b(FieldOperand(ebx, Map::kInstanceTypeOffset),
kStringRepresentationMask);
__ j(not_zero, &runtime);
__ bind(&seq_ascii_string);
// eax: subject string (flat ascii)
// ecx: RegExp data (FixedArray)
__ mov(edx, FieldOperand(ecx, JSRegExp::kDataAsciiCodeOffset));
__ Set(edi, Immediate(1)); // Type is ascii.
__ jmp(&check_code);
__ bind(&seq_two_byte_string);
// eax: subject string (flat two byte)
// ecx: RegExp data (FixedArray)
__ mov(edx, FieldOperand(ecx, JSRegExp::kDataUC16CodeOffset));
__ Set(edi, Immediate(0)); // Type is two byte.
__ bind(&check_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
// the hole.
__ CmpObjectType(edx, CODE_TYPE, ebx);
__ j(not_equal, &runtime);
// eax: subject string
// edx: code
// edi: encoding of subject string (1 if ascii, 0 if two_byte);
// Load used arguments before starting to push arguments for call to native
// RegExp code to avoid handling changing stack height.
__ mov(ebx, Operand(esp, kPreviousIndexOffset));
__ SmiUntag(ebx); // Previous index from smi.
// eax: subject string
// ebx: previous index
// edx: code
// edi: encoding of subject string (1 if ascii 0 if two_byte);
// All checks done. Now push arguments for native regexp code.
__ IncrementCounter(&Counters::regexp_entry_native, 1);
static const int kRegExpExecuteArguments = 7;
__ PrepareCallCFunction(kRegExpExecuteArguments, ecx);
// Argument 7: Indicate that this is a direct call from JavaScript.
__ mov(Operand(esp, 6 * kPointerSize), Immediate(1));
// Argument 6: Start (high end) of backtracking stack memory area.
__ mov(ecx, Operand::StaticVariable(address_of_regexp_stack_memory_address));
__ add(ecx, Operand::StaticVariable(address_of_regexp_stack_memory_size));
__ mov(Operand(esp, 5 * kPointerSize), ecx);
// Argument 5: static offsets vector buffer.
__ mov(Operand(esp, 4 * kPointerSize),
Immediate(ExternalReference::address_of_static_offsets_vector()));
// Argument 4: End of string data
// Argument 3: Start of string data
Label setup_two_byte, setup_rest;
__ test(edi, Operand(edi));
__ mov(edi, FieldOperand(eax, String::kLengthOffset));
__ j(zero, &setup_two_byte);
__ SmiUntag(edi);
__ lea(ecx, FieldOperand(eax, edi, times_1, SeqAsciiString::kHeaderSize));
__ mov(Operand(esp, 3 * kPointerSize), ecx); // Argument 4.
__ lea(ecx, FieldOperand(eax, ebx, times_1, SeqAsciiString::kHeaderSize));
__ mov(Operand(esp, 2 * kPointerSize), ecx); // Argument 3.
__ jmp(&setup_rest);
__ bind(&setup_two_byte);
STATIC_ASSERT(kSmiTag == 0);
STATIC_ASSERT(kSmiTagSize == 1); // edi is smi (powered by 2).
__ lea(ecx, FieldOperand(eax, edi, times_1, SeqTwoByteString::kHeaderSize));
__ mov(Operand(esp, 3 * kPointerSize), ecx); // Argument 4.
__ lea(ecx, FieldOperand(eax, ebx, times_2, SeqTwoByteString::kHeaderSize));
__ mov(Operand(esp, 2 * kPointerSize), ecx); // Argument 3.
__ bind(&setup_rest);
// Argument 2: Previous index.
__ mov(Operand(esp, 1 * kPointerSize), ebx);
// Argument 1: Subject string.
__ mov(Operand(esp, 0 * kPointerSize), eax);
// Locate the code entry and call it.
__ add(Operand(edx), Immediate(Code::kHeaderSize - kHeapObjectTag));
__ CallCFunction(edx, kRegExpExecuteArguments);
// Check the result.
Label success;
__ cmp(eax, NativeRegExpMacroAssembler::SUCCESS);
__ j(equal, &success, taken);
Label failure;
__ cmp(eax, NativeRegExpMacroAssembler::FAILURE);
__ j(equal, &failure, taken);
__ cmp(eax, NativeRegExpMacroAssembler::EXCEPTION);
// If not exception it can only be retry. Handle that in the runtime system.
__ j(not_equal, &runtime);
// Result must now be exception. If there is no pending exception already a
// stack overflow (on the backtrack stack) was detected in RegExp code but
// haven't created the exception yet. Handle that in the runtime system.
// TODO(592): Rerunning the RegExp to get the stack overflow exception.
ExternalReference pending_exception(Top::k_pending_exception_address);
__ mov(eax,
Operand::StaticVariable(ExternalReference::the_hole_value_location()));
__ cmp(eax, Operand::StaticVariable(pending_exception));
__ j(equal, &runtime);
__ bind(&failure);
// For failure and exception return null.
__ mov(Operand(eax), Factory::null_value());
__ ret(4 * kPointerSize);
// Load RegExp data.
__ bind(&success);
__ mov(eax, Operand(esp, kJSRegExpOffset));
__ mov(ecx, FieldOperand(eax, JSRegExp::kDataOffset));
__ mov(edx, FieldOperand(ecx, JSRegExp::kIrregexpCaptureCountOffset));
// Calculate number of capture registers (number_of_captures + 1) * 2.
STATIC_ASSERT(kSmiTag == 0);
STATIC_ASSERT(kSmiTagSize + kSmiShiftSize == 1);
__ add(Operand(edx), Immediate(2)); // edx was a smi.
// edx: Number of capture registers
// Load last_match_info which is still known to be a fast case JSArray.
__ mov(eax, Operand(esp, kLastMatchInfoOffset));
__ mov(ebx, FieldOperand(eax, JSArray::kElementsOffset));
// ebx: last_match_info backing store (FixedArray)
// edx: number of capture registers
// Store the capture count.
__ SmiTag(edx); // Number of capture registers to smi.
__ mov(FieldOperand(ebx, RegExpImpl::kLastCaptureCountOffset), edx);
__ SmiUntag(edx); // Number of capture registers back from smi.
// Store last subject and last input.
__ mov(eax, Operand(esp, kSubjectOffset));
__ mov(FieldOperand(ebx, RegExpImpl::kLastSubjectOffset), eax);
__ mov(ecx, ebx);
__ RecordWrite(ecx, RegExpImpl::kLastSubjectOffset, eax, edi);
__ mov(eax, Operand(esp, kSubjectOffset));
__ mov(FieldOperand(ebx, RegExpImpl::kLastInputOffset), eax);
__ mov(ecx, ebx);
__ RecordWrite(ecx, RegExpImpl::kLastInputOffset, eax, edi);
// Get the static offsets vector filled by the native regexp code.
ExternalReference address_of_static_offsets_vector =
ExternalReference::address_of_static_offsets_vector();
__ mov(ecx, Immediate(address_of_static_offsets_vector));
// ebx: last_match_info backing store (FixedArray)
// ecx: offsets vector
// edx: 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);
__ sub(Operand(edx), Immediate(1));
__ j(negative, &done);
// Read the value from the static offsets vector buffer.
__ mov(edi, Operand(ecx, edx, times_int_size, 0));
__ SmiTag(edi);
// Store the smi value in the last match info.
__ mov(FieldOperand(ebx,
edx,
times_pointer_size,
RegExpImpl::kFirstCaptureOffset),
edi);
__ jmp(&next_capture);
__ bind(&done);
// Return last match info.
__ mov(eax, Operand(esp, kLastMatchInfoOffset));
__ ret(4 * kPointerSize);
// Do the runtime call to execute the regexp.
__ bind(&runtime);
__ TailCallRuntime(Runtime::kRegExpExec, 4, 1);
#endif // V8_INTERPRETED_REGEXP
}
void NumberToStringStub::GenerateLookupNumberStringCache(MacroAssembler* masm,
Register object,
Register result,
Register scratch1,
Register scratch2,
bool object_is_smi,
Label* not_found) {
// Use of registers. Register result is used as a temporary.
Register number_string_cache = result;
Register mask = scratch1;
Register scratch = scratch2;
// Load the number string cache.
ExternalReference roots_address = ExternalReference::roots_address();
__ mov(scratch, Immediate(Heap::kNumberStringCacheRootIndex));
__ mov(number_string_cache,
Operand::StaticArray(scratch, times_pointer_size, roots_address));
// Make the hash mask from the length of the number string cache. It
// contains two elements (number and string) for each cache entry.
__ mov(mask, FieldOperand(number_string_cache, FixedArray::kLengthOffset));
__ shr(mask, kSmiTagSize + 1); // Untag length and divide it by two.
__ sub(Operand(mask), Immediate(1)); // Make mask.
// Calculate the entry in the number string cache. The hash value in the
// number string cache for smis is just the smi value, and the hash for
// doubles is the xor of the upper and lower words. See
// Heap::GetNumberStringCache.
Label smi_hash_calculated;
Label load_result_from_cache;
if (object_is_smi) {
__ mov(scratch, object);
__ SmiUntag(scratch);
} else {
Label not_smi, hash_calculated;
STATIC_ASSERT(kSmiTag == 0);
__ test(object, Immediate(kSmiTagMask));
__ j(not_zero, &not_smi);
__ mov(scratch, object);
__ SmiUntag(scratch);
__ jmp(&smi_hash_calculated);
__ bind(&not_smi);
__ cmp(FieldOperand(object, HeapObject::kMapOffset),
Factory::heap_number_map());
__ j(not_equal, not_found);
STATIC_ASSERT(8 == kDoubleSize);
__ mov(scratch, FieldOperand(object, HeapNumber::kValueOffset));
__ xor_(scratch, FieldOperand(object, HeapNumber::kValueOffset + 4));
// Object is heap number and hash is now in scratch. Calculate cache index.
__ and_(scratch, Operand(mask));
Register index = scratch;
Register probe = mask;
__ mov(probe,
FieldOperand(number_string_cache,
index,
times_twice_pointer_size,
FixedArray::kHeaderSize));
__ test(probe, Immediate(kSmiTagMask));
__ j(zero, not_found);
if (CpuFeatures::IsSupported(SSE2)) {
CpuFeatures::Scope fscope(SSE2);
__ movdbl(xmm0, FieldOperand(object, HeapNumber::kValueOffset));
__ movdbl(xmm1, FieldOperand(probe, HeapNumber::kValueOffset));
__ ucomisd(xmm0, xmm1);
} else {
__ fld_d(FieldOperand(object, HeapNumber::kValueOffset));
__ fld_d(FieldOperand(probe, HeapNumber::kValueOffset));
__ FCmp();
}
__ j(parity_even, not_found); // Bail out if NaN is involved.
__ j(not_equal, not_found); // The cache did not contain this value.
__ jmp(&load_result_from_cache);
}
__ bind(&smi_hash_calculated);
// Object is smi and hash is now in scratch. Calculate cache index.
__ and_(scratch, Operand(mask));
Register index = scratch;
// Check if the entry is the smi we are looking for.
__ cmp(object,
FieldOperand(number_string_cache,
index,
times_twice_pointer_size,
FixedArray::kHeaderSize));
__ j(not_equal, not_found);
// Get the result from the cache.
__ bind(&load_result_from_cache);
__ mov(result,
FieldOperand(number_string_cache,
index,
times_twice_pointer_size,
FixedArray::kHeaderSize + kPointerSize));
__ IncrementCounter(&Counters::number_to_string_native, 1);
}
void NumberToStringStub::Generate(MacroAssembler* masm) {
Label runtime;
__ mov(ebx, Operand(esp, kPointerSize));
// Generate code to lookup number in the number string cache.
GenerateLookupNumberStringCache(masm, ebx, eax, ecx, edx, false, &runtime);
__ ret(1 * kPointerSize);
__ bind(&runtime);
// Handle number to string in the runtime system if not found in the cache.
__ TailCallRuntime(Runtime::kNumberToStringSkipCache, 1, 1);
}
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;
}
void CompareStub::Generate(MacroAssembler* masm) {
ASSERT(lhs_.is(no_reg) && rhs_.is(no_reg));
Label check_unequal_objects, done;
// 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.
// Identical objects can be compared fast, but there are some tricky cases
// for NaN and undefined.
{
Label not_identical;
__ cmp(eax, Operand(edx));
__ j(not_equal, &not_identical);
if (cc_ != equal) {
// Check for undefined. undefined OP undefined is false even though
// undefined == undefined.
Label check_for_nan;
__ cmp(edx, Factory::undefined_value());
__ j(not_equal, &check_for_nan);
__ Set(eax, Immediate(Smi::FromInt(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.
// Note: if cc_ != equal, never_nan_nan_ is not used.
if (never_nan_nan_ && (cc_ == equal)) {
__ Set(eax, Immediate(Smi::FromInt(EQUAL)));
__ ret(0);
} else {
Label heap_number;
__ cmp(FieldOperand(edx, HeapObject::kMapOffset),
Immediate(Factory::heap_number_map()));
__ j(equal, &heap_number);
if (cc_ != equal) {
// Call runtime on identical JSObjects. Otherwise return equal.
__ CmpObjectType(eax, FIRST_JS_OBJECT_TYPE, ecx);
__ j(above_equal, &not_identical);
}
__ Set(eax, Immediate(Smi::FromInt(EQUAL)));
__ ret(0);
__ bind(&heap_number);
// It is a heap number, so return non-equal if it's NaN and equal if
// it's not NaN.
// The representation of NaN values has all exponent bits (52..62) set,
// and not all mantissa bits (0..51) clear.
// We only accept QNaNs, which have bit 51 set.
// Read top bits of double representation (second word of value).
// Value is a QNaN if value & kQuietNaNMask == kQuietNaNMask, i.e.,
// all bits in the mask are set. We only need to check the word
// that contains the exponent and high bit of the mantissa.
STATIC_ASSERT(((kQuietNaNHighBitsMask << 1) & 0x80000000u) != 0);
__ mov(edx, FieldOperand(edx, HeapNumber::kExponentOffset));
__ xor_(eax, Operand(eax));
// Shift value and mask so kQuietNaNHighBitsMask applies to topmost
// bits.
__ add(edx, Operand(edx));
__ cmp(edx, kQuietNaNHighBitsMask << 1);
if (cc_ == equal) {
STATIC_ASSERT(EQUAL != 1);
__ setcc(above_equal, eax);
__ ret(0);
} else {
Label nan;
__ j(above_equal, &nan);
__ Set(eax, Immediate(Smi::FromInt(EQUAL)));
__ ret(0);
__ bind(&nan);
__ Set(eax, Immediate(Smi::FromInt(NegativeComparisonResult(cc_))));
__ ret(0);
}
}
__ bind(&not_identical);
}
// Strict equality can quickly decide whether objects are equal.
// Non-strict object equality is slower, so it is handled later in the stub.
if (cc_ == equal && strict_) {
Label slow; // Fallthrough label.
Label not_smis;
// 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 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.
STATIC_ASSERT(kSmiTag == 0);
ASSERT_EQ(0, Smi::FromInt(0));
__ mov(ecx, Immediate(kSmiTagMask));
__ and_(ecx, Operand(eax));
__ test(ecx, Operand(edx));
__ j(not_zero, &not_smis);
// One operand is a smi.
// Check whether the non-smi is a heap number.
STATIC_ASSERT(kSmiTagMask == 1);
// ecx still holds eax & kSmiTag, which is either zero or one.
__ sub(Operand(ecx), Immediate(0x01));
__ mov(ebx, edx);
__ xor_(ebx, Operand(eax));
__ and_(ebx, Operand(ecx)); // ebx holds either 0 or eax ^ edx.
__ xor_(ebx, Operand(eax));
// if eax was smi, ebx is now edx, else eax.
// Check if the non-smi operand is a heap number.
__ cmp(FieldOperand(ebx, HeapObject::kMapOffset),
Immediate(Factory::heap_number_map()));
// If heap number, handle it in the slow case.
__ j(equal, &slow);
// Return non-equal (ebx is not zero)
__ mov(eax, ebx);
__ 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.
// Get the type of the first operand.
// If the first object is a JS object, we have done pointer comparison.
Label first_non_object;
STATIC_ASSERT(LAST_TYPE == JS_FUNCTION_TYPE);
__ CmpObjectType(eax, FIRST_JS_OBJECT_TYPE, ecx);
__ j(below, &first_non_object);
// Return non-zero (eax 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(ecx, ODDBALL_TYPE);
__ j(equal, &return_not_equal);
__ CmpObjectType(edx, FIRST_JS_OBJECT_TYPE, ecx);
__ j(above_equal, &return_not_equal);
// Check for oddballs: true, false, null, undefined.
__ CmpInstanceType(ecx, ODDBALL_TYPE);
__ j(equal, &return_not_equal);
// Fall through to the general case.
__ bind(&slow);
}
// Generate the number comparison code.
if (include_number_compare_) {
Label non_number_comparison;
Label unordered;
if (CpuFeatures::IsSupported(SSE2)) {
CpuFeatures::Scope use_sse2(SSE2);
CpuFeatures::Scope use_cmov(CMOV);
FloatingPointHelper::LoadSSE2Operands(masm, &non_number_comparison);
__ ucomisd(xmm0, xmm1);
// Don't base result on EFLAGS when a NaN is involved.
__ j(parity_even, &unordered, not_taken);
// Return a result of -1, 0, or 1, based on EFLAGS.
__ mov(eax, 0); // equal
__ mov(ecx, Immediate(Smi::FromInt(1)));
__ cmov(above, eax, Operand(ecx));
__ mov(ecx, Immediate(Smi::FromInt(-1)));
__ cmov(below, eax, Operand(ecx));
__ ret(0);
} else {
FloatingPointHelper::CheckFloatOperands(
masm, &non_number_comparison, ebx);
FloatingPointHelper::LoadFloatOperand(masm, eax);
FloatingPointHelper::LoadFloatOperand(masm, edx);
__ FCmp();
// Don't base result on EFLAGS when a NaN is involved.
__ j(parity_even, &unordered, not_taken);
Label below_label, above_label;
// Return a result of -1, 0, or 1, based on EFLAGS.
__ j(below, &below_label, not_taken);
__ j(above, &above_label, not_taken);
__ xor_(eax, Operand(eax));
__ ret(0);
__ bind(&below_label);
__ mov(eax, Immediate(Smi::FromInt(-1)));
__ ret(0);
__ bind(&above_label);
__ mov(eax, Immediate(Smi::FromInt(1)));
__ 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) {
__ mov(eax, Immediate(Smi::FromInt(1)));
} else {
__ mov(eax, Immediate(Smi::FromInt(-1)));
}
__ ret(0);
// The number comparison code did not provide a valid result.
__ bind(&non_number_comparison);
}
// Fast negative check for symbol-to-symbol equality.
Label check_for_strings;
if (cc_ == equal) {
BranchIfNonSymbol(masm, &check_for_strings, eax, ecx);
BranchIfNonSymbol(masm, &check_for_strings, edx, ecx);
// We've already checked for object identity, so if both operands
// are symbols they aren't equal. Register eax already holds a
// non-zero value, which indicates not equal, so just return.
__ ret(0);
}
__ bind(&check_for_strings);
__ JumpIfNotBothSequentialAsciiStrings(edx, eax, ecx, ebx,
&check_unequal_objects);
// Inline comparison of ascii strings.
StringCompareStub::GenerateCompareFlatAsciiStrings(masm,
edx,
eax,
ecx,
ebx,
edi);
#ifdef DEBUG
__ Abort("Unexpected fall-through from string comparison");
#endif
__ bind(&check_unequal_objects);
if (cc_ == equal && !strict_) {
// Non-strict equality. Objects are unequal if
// they are both JSObjects and not undetectable,
// and their pointers are different.
Label not_both_objects;
Label 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(ecx, Operand(eax, edx, times_1, 0));
__ test(ecx, Immediate(kSmiTagMask));
__ j(not_zero, &not_both_objects);
__ CmpObjectType(eax, FIRST_JS_OBJECT_TYPE, ecx);
__ j(below, &not_both_objects);
__ CmpObjectType(edx, FIRST_JS_OBJECT_TYPE, ebx);
__ j(below, &not_both_objects);
// We do not bail out after this point. Both are JSObjects, and
// they are equal if and only if both are undetectable.
// The and of the undetectable flags is 1 if and only if they are equal.
__ test_b(FieldOperand(ecx, Map::kBitFieldOffset),
1 << Map::kIsUndetectable);
__ j(zero, &return_unequal);
__ test_b(FieldOperand(ebx, Map::kBitFieldOffset),
1 << Map::kIsUndetectable);
__ j(zero, &return_unequal);
// The objects are both undetectable, so they both compare as the value
// undefined, and are equal.
__ Set(eax, Immediate(EQUAL));
__ bind(&return_unequal);
// Return non-equal by returning the non-zero object pointer in eax,
// or return equal if we fell through to here.
__ ret(0); // rax, rdx were pushed
__ bind(&not_both_objects);
}
// Push arguments below the return address.
__ pop(ecx);
__ push(edx);
__ push(eax);
// 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(Immediate(Smi::FromInt(NegativeComparisonResult(cc_))));
}
// Restore return address on the stack.
__ push(ecx);
// Call the native; it returns -1 (less), 0 (equal), or 1 (greater)
// tagged as a small integer.
__ InvokeBuiltin(builtin, JUMP_FUNCTION);
}
void CompareStub::BranchIfNonSymbol(MacroAssembler* masm,
Label* label,
Register object,
Register scratch) {
__ test(object, Immediate(kSmiTagMask));
__ j(zero, label);
__ mov(scratch, FieldOperand(object, HeapObject::kMapOffset));
__ movzx_b(scratch, FieldOperand(scratch, Map::kInstanceTypeOffset));
__ and_(scratch, kIsSymbolMask | kIsNotStringMask);
__ cmp(scratch, kSymbolTag | kStringTag);
__ j(not_equal, label);
}
void StackCheckStub::Generate(MacroAssembler* masm) {
// Because builtins always remove the receiver from the stack, we
// have to fake one to avoid underflowing the stack. The receiver
// must be inserted below the return address on the stack so we
// temporarily store that in a register.
__ pop(eax);
__ push(Immediate(Smi::FromInt(0)));
__ push(eax);
// Do tail-call to runtime routine.
__ TailCallRuntime(Runtime::kStackGuard, 1, 1);
}
void CallFunctionStub::Generate(MacroAssembler* masm) {
Label slow;
// If the receiver might be a value (string, number or boolean) check for this
// and box it if it is.
if (ReceiverMightBeValue()) {
// Get the receiver from the stack.
// +1 ~ return address
Label receiver_is_value, receiver_is_js_object;
__ mov(eax, Operand(esp, (argc_ + 1) * kPointerSize));
// Check if receiver is a smi (which is a number value).
__ test(eax, Immediate(kSmiTagMask));
__ j(zero, &receiver_is_value, not_taken);
// Check if the receiver is a valid JS object.
__ CmpObjectType(eax, FIRST_JS_OBJECT_TYPE, edi);
__ j(above_equal, &receiver_is_js_object);
// Call the runtime to box the value.
__ bind(&receiver_is_value);
__ EnterInternalFrame();
__ push(eax);
__ InvokeBuiltin(Builtins::TO_OBJECT, CALL_FUNCTION);
__ LeaveInternalFrame();
__ mov(Operand(esp, (argc_ + 1) * kPointerSize), eax);
__ bind(&receiver_is_js_object);
}
// Get the function to call from the stack.
// +2 ~ receiver, return address
__ mov(edi, Operand(esp, (argc_ + 2) * kPointerSize));
// Check that the function really is a JavaScript function.
__ test(edi, Immediate(kSmiTagMask));
__ j(zero, &slow, not_taken);
// Goto slow case if we do not have a function.
__ CmpObjectType(edi, JS_FUNCTION_TYPE, ecx);
__ j(not_equal, &slow, not_taken);
// Fast-case: Just invoke the function.
ParameterCount actual(argc_);
__ InvokeFunction(edi, actual, JUMP_FUNCTION);
// Slow-case: Non-function called.
__ bind(&slow);
// CALL_NON_FUNCTION expects the non-function callee as receiver (instead
// of the original receiver from the call site).
__ mov(Operand(esp, (argc_ + 1) * kPointerSize), edi);
__ Set(eax, Immediate(argc_));
__ Set(ebx, Immediate(0));
__ GetBuiltinEntry(edx, Builtins::CALL_NON_FUNCTION);
Handle<Code> adaptor(Builtins::builtin(Builtins::ArgumentsAdaptorTrampoline));
__ jmp(adaptor, RelocInfo::CODE_TARGET);
}
void CEntryStub::GenerateThrowTOS(MacroAssembler* masm) {
// eax holds the exception.
// Adjust this code if not the case.
STATIC_ASSERT(StackHandlerConstants::kSize == 4 * kPointerSize);
// Drop the sp to the top of the handler.
ExternalReference handler_address(Top::k_handler_address);
__ mov(esp, Operand::StaticVariable(handler_address));
// Restore next handler and frame pointer, discard handler state.
STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0);
__ pop(Operand::StaticVariable(handler_address));
STATIC_ASSERT(StackHandlerConstants::kFPOffset == 1 * kPointerSize);
__ pop(ebp);
__ pop(edx); // Remove state.
// Before returning we restore the context from the frame pointer if
// not NULL. The frame pointer is NULL in the exception handler of
// a JS entry frame.
__ xor_(esi, Operand(esi)); // Tentatively set context pointer to NULL.
Label skip;
__ cmp(ebp, 0);
__ j(equal, &skip, not_taken);
__ mov(esi, Operand(ebp, StandardFrameConstants::kContextOffset));
__ bind(&skip);
STATIC_ASSERT(StackHandlerConstants::kPCOffset == 3 * kPointerSize);
__ ret(0);
}
// If true, a Handle<T> passed by value is passed and returned by
// using the location_ field directly. If false, it is passed and
// returned as a pointer to a handle.
#ifdef USING_BSD_ABI
static const bool kPassHandlesDirectly = true;
#else
static const bool kPassHandlesDirectly = false;
#endif
void ApiGetterEntryStub::Generate(MacroAssembler* masm) {
Label empty_handle;
Label prologue;
Label promote_scheduled_exception;
__ EnterApiExitFrame(kStackSpace, kArgc);
STATIC_ASSERT(kArgc == 4);
if (kPassHandlesDirectly) {
// When handles as passed directly we don't have to allocate extra
// space for and pass an out parameter.
__ mov(Operand(esp, 0 * kPointerSize), ebx); // name.
__ mov(Operand(esp, 1 * kPointerSize), eax); // arguments pointer.
} else {
// The function expects three arguments to be passed but we allocate
// four to get space for the output cell. The argument slots are filled
// as follows:
//
// 3: output cell
// 2: arguments pointer
// 1: name
// 0: pointer to the output cell
//
// Note that this is one more "argument" than the function expects
// so the out cell will have to be popped explicitly after returning
// from the function.
__ mov(Operand(esp, 1 * kPointerSize), ebx); // name.
__ mov(Operand(esp, 2 * kPointerSize), eax); // arguments pointer.
__ mov(ebx, esp);
__ add(Operand(ebx), Immediate(3 * kPointerSize));
__ mov(Operand(esp, 0 * kPointerSize), ebx); // output
__ mov(Operand(esp, 3 * kPointerSize), Immediate(0)); // out cell.
}
// Call the api function!
__ call(fun()->address(), RelocInfo::RUNTIME_ENTRY);
// Check if the function scheduled an exception.
ExternalReference scheduled_exception_address =
ExternalReference::scheduled_exception_address();
__ cmp(Operand::StaticVariable(scheduled_exception_address),
Immediate(Factory::the_hole_value()));
__ j(not_equal, &promote_scheduled_exception, not_taken);
if (!kPassHandlesDirectly) {
// The returned value is a pointer to the handle holding the result.
// Dereference this to get to the location.
__ mov(eax, Operand(eax, 0));
}
// Check if the result handle holds 0.
__ test(eax, Operand(eax));
__ j(zero, &empty_handle, not_taken);
// It was non-zero. Dereference to get the result value.
__ mov(eax, Operand(eax, 0));
__ bind(&prologue);
__ LeaveExitFrame();
__ ret(0);
__ bind(&promote_scheduled_exception);
__ TailCallRuntime(Runtime::kPromoteScheduledException, 0, 1);
__ bind(&empty_handle);
// It was zero; the result is undefined.
__ mov(eax, Factory::undefined_value());
__ jmp(&prologue);
}
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,
int /* alignment_skew */) {
// eax: result parameter for PerformGC, if any
// ebx: pointer to C function (C callee-saved)
// ebp: frame pointer (restored after C call)
// esp: stack pointer (restored after C call)
// edi: number of arguments including receiver (C callee-saved)
// esi: pointer to the first argument (C callee-saved)
// Result returned in eax, or eax+edx if result_size_ is 2.
// 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 alignment is known to be correct. This function takes one argument
// which is passed on the stack, and we know that the stack has been
// prepared to pass at least one argument.
__ mov(Operand(esp, 0 * kPointerSize), eax); // Result.
__ call(FUNCTION_ADDR(Runtime::PerformGC), RelocInfo::RUNTIME_ENTRY);
}
ExternalReference scope_depth =
ExternalReference::heap_always_allocate_scope_depth();
if (always_allocate_scope) {
__ inc(Operand::StaticVariable(scope_depth));
}
// Call C function.
__ mov(Operand(esp, 0 * kPointerSize), edi); // argc.
__ mov(Operand(esp, 1 * kPointerSize), esi); // argv.
__ call(Operand(ebx));
// Result is in eax or edx:eax - do not destroy these registers!
if (always_allocate_scope) {
__ dec(Operand::StaticVariable(scope_depth));
}
// Make sure we're not trying to return 'the hole' from the runtime
// call as this may lead to crashes in the IC code later.
if (FLAG_debug_code) {
Label okay;
__ cmp(eax, Factory::the_hole_value());
__ j(not_equal, &okay);
__ int3();
__ bind(&okay);
}
// Check for failure result.
Label failure_returned;
STATIC_ASSERT(((kFailureTag + 1) & kFailureTagMask) == 0);
__ lea(ecx, Operand(eax, 1));
// Lower 2 bits of ecx are 0 iff eax has failure tag.
__ test(ecx, Immediate(kFailureTagMask));
__ j(zero, &failure_returned, not_taken);
// Exit the JavaScript to C++ exit frame.
__ LeaveExitFrame();
__ 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);
__ test(eax, Immediate(((1 << kFailureTypeTagSize) - 1) << kFailureTagSize));
__ j(zero, &retry, taken);
// Special handling of out of memory exceptions.
__ cmp(eax, reinterpret_cast<int32_t>(Failure::OutOfMemoryException()));
__ j(equal, throw_out_of_memory_exception);
// Retrieve the pending exception and clear the variable.
ExternalReference pending_exception_address(Top::k_pending_exception_address);
__ mov(eax, Operand::StaticVariable(pending_exception_address));
__ mov(edx,
Operand::StaticVariable(ExternalReference::the_hole_value_location()));
__ mov(Operand::StaticVariable(pending_exception_address), edx);
// Special handling of termination exceptions which are uncatchable
// by javascript code.
__ cmp(eax, Factory::termination_exception());
__ j(equal, throw_termination_exception);
// Handle normal exception.
__ jmp(throw_normal_exception);
// Retry.
__ bind(&retry);
}
void CEntryStub::GenerateThrowUncatchable(MacroAssembler* masm,
UncatchableExceptionType type) {
// Adjust this code if not the case.
STATIC_ASSERT(StackHandlerConstants::kSize == 4 * kPointerSize);
// Drop sp to the top stack handler.
ExternalReference handler_address(Top::k_handler_address);
__ mov(esp, Operand::StaticVariable(handler_address));
// Unwind the handlers until the ENTRY handler is found.
Label loop, done;
__ bind(&loop);
// Load the type of the current stack handler.
const int kStateOffset = StackHandlerConstants::kStateOffset;
__ cmp(Operand(esp, kStateOffset), Immediate(StackHandler::ENTRY));
__ j(equal, &done);
// Fetch the next handler in the list.
const int kNextOffset = StackHandlerConstants::kNextOffset;
__ mov(esp, Operand(esp, kNextOffset));
__ jmp(&loop);
__ bind(&done);
// Set the top handler address to next handler past the current ENTRY handler.
STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0);
__ pop(Operand::StaticVariable(handler_address));
if (type == OUT_OF_MEMORY) {
// Set external caught exception to false.
ExternalReference external_caught(Top::k_external_caught_exception_address);
__ mov(eax, false);
__ mov(Operand::StaticVariable(external_caught), eax);
// Set pending exception and eax to out of memory exception.
ExternalReference pending_exception(Top::k_pending_exception_address);
__ mov(eax, reinterpret_cast<int32_t>(Failure::OutOfMemoryException()));
__ mov(Operand::StaticVariable(pending_exception), eax);
}
// Clear the context pointer.
__ xor_(esi, Operand(esi));
// Restore fp from handler and discard handler state.
STATIC_ASSERT(StackHandlerConstants::kFPOffset == 1 * kPointerSize);
__ pop(ebp);
__ pop(edx); // State.
STATIC_ASSERT(StackHandlerConstants::kPCOffset == 3 * kPointerSize);
__ ret(0);
}
void CEntryStub::Generate(MacroAssembler* masm) {
// eax: number of arguments including receiver
// ebx: pointer to C function (C callee-saved)
// ebp: frame pointer (restored after C call)
// esp: stack pointer (restored after C call)
// esi: current context (C callee-saved)
// edi: JS function of the caller (C callee-saved)
// 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 (twice).
// Enter the exit frame that transitions from JavaScript to C++.
__ EnterExitFrame();
// eax: result parameter for PerformGC, if any (setup below)
// ebx: pointer to builtin function (C callee-saved)
// ebp: frame pointer (restored after C call)
// esp: stack pointer (restored after C call)
// edi: number of arguments including receiver (C callee-saved)
// esi: 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();
__ mov(eax, Immediate(reinterpret_cast<int32_t>(failure)));
GenerateCore(masm,
&throw_normal_exception,
&throw_termination_exception,
&throw_out_of_memory_exception,
true,
true);
__ bind(&throw_out_of_memory_exception);
GenerateThrowUncatchable(masm, OUT_OF_MEMORY);
__ bind(&throw_termination_exception);
GenerateThrowUncatchable(masm, TERMINATION);
__ bind(&throw_normal_exception);
GenerateThrowTOS(masm);
}
void JSEntryStub::GenerateBody(MacroAssembler* masm, bool is_construct) {
Label invoke, exit;
#ifdef ENABLE_LOGGING_AND_PROFILING
Label not_outermost_js, not_outermost_js_2;
#endif
// Setup frame.
__ push(ebp);
__ mov(ebp, Operand(esp));
// Push marker in two places.
int marker = is_construct ? StackFrame::ENTRY_CONSTRUCT : StackFrame::ENTRY;
__ push(Immediate(Smi::FromInt(marker))); // context slot
__ push(Immediate(Smi::FromInt(marker))); // function slot
// Save callee-saved registers (C calling conventions).
__ push(edi);
__ push(esi);
__ push(ebx);
// Save copies of the top frame descriptor on the stack.
ExternalReference c_entry_fp(Top::k_c_entry_fp_address);
__ push(Operand::StaticVariable(c_entry_fp));
#ifdef ENABLE_LOGGING_AND_PROFILING
// If this is the outermost JS call, set js_entry_sp value.
ExternalReference js_entry_sp(Top::k_js_entry_sp_address);
__ cmp(Operand::StaticVariable(js_entry_sp), Immediate(0));
__ j(not_equal, &not_outermost_js);
__ mov(Operand::StaticVariable(js_entry_sp), ebp);
__ bind(&not_outermost_js);
#endif
// Call a faked try-block that does the invoke.
__ call(&invoke);
// Caught exception: Store result (exception) in the pending
// exception field in the JSEnv and return a failure sentinel.
ExternalReference pending_exception(Top::k_pending_exception_address);
__ mov(Operand::StaticVariable(pending_exception), eax);
__ mov(eax, reinterpret_cast<int32_t>(Failure::Exception()));
__ jmp(&exit);
// Invoke: Link this frame into the handler chain.
__ bind(&invoke);
__ PushTryHandler(IN_JS_ENTRY, JS_ENTRY_HANDLER);
// Clear any pending exceptions.
__ mov(edx,
Operand::StaticVariable(ExternalReference::the_hole_value_location()));
__ mov(Operand::StaticVariable(pending_exception), edx);
// 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. Notice that we
// cannot store a reference to the trampoline code directly in this
// stub, because the builtin stubs may not have been generated yet.
if (is_construct) {
ExternalReference construct_entry(Builtins::JSConstructEntryTrampoline);
__ mov(edx, Immediate(construct_entry));
} else {
ExternalReference entry(Builtins::JSEntryTrampoline);
__ mov(edx, Immediate(entry));
}
__ mov(edx, Operand(edx, 0)); // deref address
__ lea(edx, FieldOperand(edx, Code::kHeaderSize));
__ call(Operand(edx));
// Unlink this frame from the handler chain.
__ pop(Operand::StaticVariable(ExternalReference(Top::k_handler_address)));
// Pop next_sp.
__ add(Operand(esp), Immediate(StackHandlerConstants::kSize - kPointerSize));
#ifdef ENABLE_LOGGING_AND_PROFILING
// If current EBP value is the same as js_entry_sp value, it means that
// the current function is the outermost.
__ cmp(ebp, Operand::StaticVariable(js_entry_sp));
__ j(not_equal, &not_outermost_js_2);
__ mov(Operand::StaticVariable(js_entry_sp), Immediate(0));
__ bind(&not_outermost_js_2);
#endif
// Restore the top frame descriptor from the stack.
__ bind(&exit);
__ pop(Operand::StaticVariable(ExternalReference(Top::k_c_entry_fp_address)));
// Restore callee-saved registers (C calling conventions).
__ pop(ebx);
__ pop(esi);
__ pop(edi);
__ add(Operand(esp), Immediate(2 * kPointerSize)); // remove markers
// Restore frame pointer and return.
__ pop(ebp);
__ ret(0);
}
void InstanceofStub::Generate(MacroAssembler* masm) {
// Get the object - go slow case if it's a smi.
Label slow;
__ mov(eax, Operand(esp, 2 * kPointerSize)); // 2 ~ return address, function
__ test(eax, Immediate(kSmiTagMask));
__ j(zero, &slow, not_taken);
// Check that the left hand is a JS object.
__ IsObjectJSObjectType(eax, eax, edx, &slow);
// Get the prototype of the function.
__ mov(edx, Operand(esp, 1 * kPointerSize)); // 1 ~ return address
// edx is function, eax is map.
// Look up the function and the map in the instanceof cache.
Label miss;
ExternalReference roots_address = ExternalReference::roots_address();
__ mov(ecx, Immediate(Heap::kInstanceofCacheFunctionRootIndex));
__ cmp(edx, Operand::StaticArray(ecx, times_pointer_size, roots_address));
__ j(not_equal, &miss);
__ mov(ecx, Immediate(Heap::kInstanceofCacheMapRootIndex));
__ cmp(eax, Operand::StaticArray(ecx, times_pointer_size, roots_address));
__ j(not_equal, &miss);
__ mov(ecx, Immediate(Heap::kInstanceofCacheAnswerRootIndex));
__ mov(eax, Operand::StaticArray(ecx, times_pointer_size, roots_address));
__ ret(2 * kPointerSize);
__ bind(&miss);
__ TryGetFunctionPrototype(edx, ebx, ecx, &slow);
// Check that the function prototype is a JS object.
__ test(ebx, Immediate(kSmiTagMask));
__ j(zero, &slow, not_taken);
__ IsObjectJSObjectType(ebx, ecx, ecx, &slow);
// Register mapping:
// eax is object map.
// edx is function.
// ebx is function prototype.
__ mov(ecx, Immediate(Heap::kInstanceofCacheMapRootIndex));
__ mov(Operand::StaticArray(ecx, times_pointer_size, roots_address), eax);
__ mov(ecx, Immediate(Heap::kInstanceofCacheFunctionRootIndex));
__ mov(Operand::StaticArray(ecx, times_pointer_size, roots_address), edx);
__ mov(ecx, FieldOperand(eax, Map::kPrototypeOffset));
// Loop through the prototype chain looking for the function prototype.
Label loop, is_instance, is_not_instance;
__ bind(&loop);
__ cmp(ecx, Operand(ebx));
__ j(equal, &is_instance);
__ cmp(Operand(ecx), Immediate(Factory::null_value()));
__ j(equal, &is_not_instance);
__ mov(ecx, FieldOperand(ecx, HeapObject::kMapOffset));
__ mov(ecx, FieldOperand(ecx, Map::kPrototypeOffset));
__ jmp(&loop);
__ bind(&is_instance);
__ Set(eax, Immediate(0));
__ mov(ecx, Immediate(Heap::kInstanceofCacheAnswerRootIndex));
__ mov(Operand::StaticArray(ecx, times_pointer_size, roots_address), eax);
__ ret(2 * kPointerSize);
__ bind(&is_not_instance);
__ Set(eax, Immediate(Smi::FromInt(1)));
__ mov(ecx, Immediate(Heap::kInstanceofCacheAnswerRootIndex));
__ mov(Operand::StaticArray(ecx, times_pointer_size, roots_address), eax);
__ ret(2 * kPointerSize);
// Slow-case: Go through the JavaScript implementation.
__ bind(&slow);
__ InvokeBuiltin(Builtins::INSTANCE_OF, JUMP_FUNCTION);
}
int CompareStub::MinorKey() {
// Encode the three parameters in a unique 16 bit value. To avoid duplicate
// stubs the never NaN NaN condition is only taken into account if the
// condition is equals.
ASSERT(static_cast<unsigned>(cc_) < (1 << 12));
ASSERT(lhs_.is(no_reg) && rhs_.is(no_reg));
return ConditionField::encode(static_cast<unsigned>(cc_))
| RegisterField::encode(false) // lhs_ and rhs_ are not used
| StrictField::encode(strict_)
| NeverNanNanField::encode(cc_ == equal ? never_nan_nan_ : false)
| IncludeNumberCompareField::encode(include_number_compare_);
}
// Unfortunately you have to run without snapshots to see most of these
// names in the profile since most compare stubs end up in the snapshot.
const char* CompareStub::GetName() {
ASSERT(lhs_.is(no_reg) && rhs_.is(no_reg));
if (name_ != NULL) return name_;
const int kMaxNameLength = 100;
name_ = Bootstrapper::AllocateAutoDeletedArray(kMaxNameLength);
if (name_ == NULL) return "OOM";
const char* cc_name;
switch (cc_) {
case less: cc_name = "LT"; break;
case greater: cc_name = "GT"; break;
case less_equal: cc_name = "LE"; break;
case greater_equal: cc_name = "GE"; break;
case equal: cc_name = "EQ"; break;
case not_equal: cc_name = "NE"; break;
default: cc_name = "UnknownCondition"; break;
}
const char* strict_name = "";
if (strict_ && (cc_ == equal || cc_ == not_equal)) {
strict_name = "_STRICT";
}
const char* never_nan_nan_name = "";
if (never_nan_nan_ && (cc_ == equal || cc_ == not_equal)) {
never_nan_nan_name = "_NO_NAN";
}
const char* include_number_compare_name = "";
if (!include_number_compare_) {
include_number_compare_name = "_NO_NUMBER";
}
OS::SNPrintF(Vector<char>(name_, kMaxNameLength),
"CompareStub_%s%s%s%s",
cc_name,
strict_name,
never_nan_nan_name,
include_number_compare_name);
return name_;
}
// -------------------------------------------------------------------------
// StringCharCodeAtGenerator
void StringCharCodeAtGenerator::GenerateFast(MacroAssembler* masm) {
Label flat_string;
Label ascii_string;
Label got_char_code;
// If the receiver is a smi trigger the non-string case.
STATIC_ASSERT(kSmiTag == 0);
__ test(object_, Immediate(kSmiTagMask));
__ j(zero, receiver_not_string_);
// Fetch the instance type of the receiver into result register.
__ mov(result_, FieldOperand(object_, HeapObject::kMapOffset));
__ movzx_b(result_, FieldOperand(result_, Map::kInstanceTypeOffset));
// If the receiver is not a string trigger the non-string case.
__ test(result_, Immediate(kIsNotStringMask));
__ j(not_zero, receiver_not_string_);
// If the index is non-smi trigger the non-smi case.
STATIC_ASSERT(kSmiTag == 0);
__ test(index_, Immediate(kSmiTagMask));
__ j(not_zero, &index_not_smi_);
// Put smi-tagged index into scratch register.
__ mov(scratch_, index_);
__ bind(&got_smi_index_);
// Check for index out of range.
__ cmp(scratch_, FieldOperand(object_, String::kLengthOffset));
__ j(above_equal, index_out_of_range_);
// We need special handling for non-flat strings.
STATIC_ASSERT(kSeqStringTag == 0);
__ test(result_, Immediate(kStringRepresentationMask));
__ j(zero, &flat_string);
// Handle non-flat strings.
__ test(result_, Immediate(kIsConsStringMask));
__ j(zero, &call_runtime_);
// ConsString.
// Check whether the right hand side is the empty string (i.e. if
// this is really a flat string in a cons string). If that is not
// the case we would rather go to the runtime system now to flatten
// the string.
__ cmp(FieldOperand(object_, ConsString::kSecondOffset),
Immediate(Factory::empty_string()));
__ j(not_equal, &call_runtime_);
// Get the first of the two strings and load its instance type.
__ mov(object_, FieldOperand(object_, ConsString::kFirstOffset));
__ mov(result_, FieldOperand(object_, HeapObject::kMapOffset));
__ movzx_b(result_, FieldOperand(result_, Map::kInstanceTypeOffset));
// If the first cons component is also non-flat, then go to runtime.
STATIC_ASSERT(kSeqStringTag == 0);
__ test(result_, Immediate(kStringRepresentationMask));
__ j(not_zero, &call_runtime_);
// Check for 1-byte or 2-byte string.
__ bind(&flat_string);
STATIC_ASSERT(kAsciiStringTag != 0);
__ test(result_, Immediate(kStringEncodingMask));
__ j(not_zero, &ascii_string);
// 2-byte string.
// Load the 2-byte character code into the result register.
STATIC_ASSERT(kSmiTag == 0 && kSmiTagSize == 1);
__ movzx_w(result_, FieldOperand(object_,
scratch_, times_1, // Scratch is smi-tagged.
SeqTwoByteString::kHeaderSize));
__ jmp(&got_char_code);
// ASCII string.
// Load the byte into the result register.
__ bind(&ascii_string);
__ SmiUntag(scratch_);
__ movzx_b(result_, FieldOperand(object_,
scratch_, times_1,
SeqAsciiString::kHeaderSize));
__ bind(&got_char_code);
__ SmiTag(result_);
__ bind(&exit_);
}
void StringCharCodeAtGenerator::GenerateSlow(
MacroAssembler* masm, const RuntimeCallHelper& call_helper) {
__ Abort("Unexpected fallthrough to CharCodeAt slow case");
// 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_, true);
call_helper.BeforeCall(masm);
__ push(object_);
__ push(index_);
__ 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 (!scratch_.is(eax)) {
// Save the conversion result before the pop instructions below
// have a chance to overwrite it.
__ mov(scratch_, eax);
}
__ pop(index_);
__ pop(object_);
// Reload the instance type.
__ mov(result_, FieldOperand(object_, HeapObject::kMapOffset));
__ movzx_b(result_, FieldOperand(result_, Map::kInstanceTypeOffset));
call_helper.AfterCall(masm);
// If index is still not a smi, it must be out of range.
STATIC_ASSERT(kSmiTag == 0);
__ test(scratch_, Immediate(kSmiTagMask));
__ j(not_zero, 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_);
__ push(index_);
__ CallRuntime(Runtime::kStringCharCodeAt, 2);
if (!result_.is(eax)) {
__ mov(result_, eax);
}
call_helper.AfterCall(masm);
__ jmp(&exit_);
__ Abort("Unexpected fallthrough from CharCodeAt slow case");
}
// -------------------------------------------------------------------------
// StringCharFromCodeGenerator
void StringCharFromCodeGenerator::GenerateFast(MacroAssembler* masm) {
// Fast case of Heap::LookupSingleCharacterStringFromCode.
STATIC_ASSERT(kSmiTag == 0);
STATIC_ASSERT(kSmiShiftSize == 0);
ASSERT(IsPowerOf2(String::kMaxAsciiCharCode + 1));
__ test(code_,
Immediate(kSmiTagMask |
((~String::kMaxAsciiCharCode) << kSmiTagSize)));
__ j(not_zero, &slow_case_, not_taken);
__ Set(result_, Immediate(Factory::single_character_string_cache()));
STATIC_ASSERT(kSmiTag == 0);
STATIC_ASSERT(kSmiTagSize == 1);
STATIC_ASSERT(kSmiShiftSize == 0);
// At this point code register contains smi tagged ascii char code.
__ mov(result_, FieldOperand(result_,
code_, times_half_pointer_size,
FixedArray::kHeaderSize));
__ cmp(result_, Factory::undefined_value());
__ j(equal, &slow_case_, not_taken);
__ bind(&exit_);
}
void StringCharFromCodeGenerator::GenerateSlow(
MacroAssembler* masm, const RuntimeCallHelper& call_helper) {
__ Abort("Unexpected fallthrough to CharFromCode slow case");
__ bind(&slow_case_);
call_helper.BeforeCall(masm);
__ push(code_);
__ CallRuntime(Runtime::kCharFromCode, 1);
if (!result_.is(eax)) {
__ mov(result_, eax);
}
call_helper.AfterCall(masm);
__ jmp(&exit_);
__ Abort("Unexpected fallthrough from CharFromCode slow case");
}
// -------------------------------------------------------------------------
// StringCharAtGenerator
void StringCharAtGenerator::GenerateFast(MacroAssembler* masm) {
char_code_at_generator_.GenerateFast(masm);
char_from_code_generator_.GenerateFast(masm);
}
void StringCharAtGenerator::GenerateSlow(
MacroAssembler* masm, const RuntimeCallHelper& call_helper) {
char_code_at_generator_.GenerateSlow(masm, call_helper);
char_from_code_generator_.GenerateSlow(masm, call_helper);
}
void StringAddStub::Generate(MacroAssembler* masm) {
Label string_add_runtime, call_builtin;
Builtins::JavaScript builtin_id = Builtins::ADD;
// Load the two arguments.
__ mov(eax, Operand(esp, 2 * kPointerSize)); // First argument.
__ mov(edx, Operand(esp, 1 * kPointerSize)); // Second argument.
// Make sure that both arguments are strings if not known in advance.
if (flags_ == NO_STRING_ADD_FLAGS) {
__ test(eax, Immediate(kSmiTagMask));
__ j(zero, &string_add_runtime);
__ CmpObjectType(eax, FIRST_NONSTRING_TYPE, ebx);
__ j(above_equal, &string_add_runtime);
// First argument is a a string, test second.
__ test(edx, Immediate(kSmiTagMask));
__ j(zero, &string_add_runtime);
__ CmpObjectType(edx, FIRST_NONSTRING_TYPE, ebx);
__ j(above_equal, &string_add_runtime);
} else {
// Here at least one of the arguments is definitely a string.
// We convert the one that is not known to be a string.
if ((flags_ & NO_STRING_CHECK_LEFT_IN_STUB) == 0) {
ASSERT((flags_ & NO_STRING_CHECK_RIGHT_IN_STUB) != 0);
GenerateConvertArgument(masm, 2 * kPointerSize, eax, ebx, ecx, edi,
&call_builtin);
builtin_id = Builtins::STRING_ADD_RIGHT;
} else if ((flags_ & NO_STRING_CHECK_RIGHT_IN_STUB) == 0) {
ASSERT((flags_ & NO_STRING_CHECK_LEFT_IN_STUB) != 0);
GenerateConvertArgument(masm, 1 * kPointerSize, edx, ebx, ecx, edi,
&call_builtin);
builtin_id = Builtins::STRING_ADD_LEFT;
}
}
// Both arguments are strings.
// eax: first string
// edx: second string
// Check if either of the strings are empty. In that case return the other.
Label second_not_zero_length, both_not_zero_length;
__ mov(ecx, FieldOperand(edx, String::kLengthOffset));
STATIC_ASSERT(kSmiTag == 0);
__ test(ecx, Operand(ecx));
__ j(not_zero, &second_not_zero_length);
// Second string is empty, result is first string which is already in eax.
__ IncrementCounter(&Counters::string_add_native, 1);
__ ret(2 * kPointerSize);
__ bind(&second_not_zero_length);
__ mov(ebx, FieldOperand(eax, String::kLengthOffset));
STATIC_ASSERT(kSmiTag == 0);
__ test(ebx, Operand(ebx));
__ j(not_zero, &both_not_zero_length);
// First string is empty, result is second string which is in edx.
__ mov(eax, edx);
__ IncrementCounter(&Counters::string_add_native, 1);
__ ret(2 * kPointerSize);
// Both strings are non-empty.
// eax: first string
// ebx: length of first string as a smi
// ecx: length of second string as a smi
// edx: second string
// Look at the length of the result of adding the two strings.
Label string_add_flat_result, longer_than_two;
__ bind(&both_not_zero_length);
__ add(ebx, Operand(ecx));
STATIC_ASSERT(Smi::kMaxValue == String::kMaxLength);
// Handle exceptionally long strings in the runtime system.
__ j(overflow, &string_add_runtime);
// Use the runtime system when adding two one character strings, as it
// contains optimizations for this specific case using the symbol table.
__ cmp(Operand(ebx), Immediate(Smi::FromInt(2)));
__ j(not_equal, &longer_than_two);
// Check that both strings are non-external ascii strings.
__ JumpIfNotBothSequentialAsciiStrings(eax, edx, ebx, ecx,
&string_add_runtime);
// Get the two characters forming the new string.
__ movzx_b(ebx, FieldOperand(eax, SeqAsciiString::kHeaderSize));
__ movzx_b(ecx, FieldOperand(edx, SeqAsciiString::kHeaderSize));
// Try to lookup two character string in symbol table. If it is not found
// just allocate a new one.
Label make_two_character_string, make_two_character_string_no_reload;
StringHelper::GenerateTwoCharacterSymbolTableProbe(
masm, ebx, ecx, eax, edx, edi,
&make_two_character_string_no_reload, &make_two_character_string);
__ IncrementCounter(&Counters::string_add_native, 1);
__ ret(2 * kPointerSize);
// Allocate a two character string.
__ bind(&make_two_character_string);
// Reload the arguments.
__ mov(eax, Operand(esp, 2 * kPointerSize)); // First argument.
__ mov(edx, Operand(esp, 1 * kPointerSize)); // Second argument.
// Get the two characters forming the new string.
__ movzx_b(ebx, FieldOperand(eax, SeqAsciiString::kHeaderSize));
__ movzx_b(ecx, FieldOperand(edx, SeqAsciiString::kHeaderSize));
__ bind(&make_two_character_string_no_reload);
__ IncrementCounter(&Counters::string_add_make_two_char, 1);
__ AllocateAsciiString(eax, // Result.
2, // Length.
edi, // Scratch 1.
edx, // Scratch 2.
&string_add_runtime);
// Pack both characters in ebx.
__ shl(ecx, kBitsPerByte);
__ or_(ebx, Operand(ecx));
// Set the characters in the new string.
__ mov_w(FieldOperand(eax, SeqAsciiString::kHeaderSize), ebx);
__ IncrementCounter(&Counters::string_add_native, 1);
__ ret(2 * kPointerSize);
__ bind(&longer_than_two);
// Check if resulting string will be flat.
__ cmp(Operand(ebx), Immediate(Smi::FromInt(String::kMinNonFlatLength)));
__ j(below, &string_add_flat_result);
// If result is not supposed to be flat allocate a cons string object. If both
// strings are ascii the result is an ascii cons string.
Label non_ascii, allocated, ascii_data;
__ mov(edi, FieldOperand(eax, HeapObject::kMapOffset));
__ movzx_b(ecx, FieldOperand(edi, Map::kInstanceTypeOffset));
__ mov(edi, FieldOperand(edx, HeapObject::kMapOffset));
__ movzx_b(edi, FieldOperand(edi, Map::kInstanceTypeOffset));
__ and_(ecx, Operand(edi));
STATIC_ASSERT(kStringEncodingMask == kAsciiStringTag);
__ test(ecx, Immediate(kAsciiStringTag));
__ j(zero, &non_ascii);
__ bind(&ascii_data);
// Allocate an acsii cons string.
__ AllocateAsciiConsString(ecx, edi, no_reg, &string_add_runtime);
__ bind(&allocated);
// Fill the fields of the cons string.
if (FLAG_debug_code) __ AbortIfNotSmi(ebx);
__ mov(FieldOperand(ecx, ConsString::kLengthOffset), ebx);
__ mov(FieldOperand(ecx, ConsString::kHashFieldOffset),
Immediate(String::kEmptyHashField));
__ mov(FieldOperand(ecx, ConsString::kFirstOffset), eax);
__ mov(FieldOperand(ecx, ConsString::kSecondOffset), edx);
__ mov(eax, ecx);
__ IncrementCounter(&Counters::string_add_native, 1);
__ ret(2 * kPointerSize);
__ bind(&non_ascii);
// At least one of the strings is two-byte. Check whether it happens
// to contain only ascii characters.
// ecx: first instance type AND second instance type.
// edi: second instance type.
__ test(ecx, Immediate(kAsciiDataHintMask));
__ j(not_zero, &ascii_data);
__ mov(ecx, FieldOperand(eax, HeapObject::kMapOffset));
__ movzx_b(ecx, FieldOperand(ecx, Map::kInstanceTypeOffset));
__ xor_(edi, Operand(ecx));
STATIC_ASSERT(kAsciiStringTag != 0 && kAsciiDataHintTag != 0);
__ and_(edi, kAsciiStringTag | kAsciiDataHintTag);
__ cmp(edi, kAsciiStringTag | kAsciiDataHintTag);
__ j(equal, &ascii_data);
// Allocate a two byte cons string.
__ AllocateConsString(ecx, edi, no_reg, &string_add_runtime);
__ jmp(&allocated);
// Handle creating a flat result. First check that both strings are not
// external strings.
// eax: first string
// ebx: length of resulting flat string as a smi
// edx: second string
__ bind(&string_add_flat_result);
__ mov(ecx, FieldOperand(eax, HeapObject::kMapOffset));
__ movzx_b(ecx, FieldOperand(ecx, Map::kInstanceTypeOffset));
__ and_(ecx, kStringRepresentationMask);
__ cmp(ecx, kExternalStringTag);
__ j(equal, &string_add_runtime);
__ mov(ecx, FieldOperand(edx, HeapObject::kMapOffset));
__ movzx_b(ecx, FieldOperand(ecx, Map::kInstanceTypeOffset));
__ and_(ecx, kStringRepresentationMask);
__ cmp(ecx, kExternalStringTag);
__ j(equal, &string_add_runtime);
// Now check if both strings are ascii strings.
// eax: first string
// ebx: length of resulting flat string as a smi
// edx: second string
Label non_ascii_string_add_flat_result;
STATIC_ASSERT(kStringEncodingMask == kAsciiStringTag);
__ mov(ecx, FieldOperand(eax, HeapObject::kMapOffset));
__ test_b(FieldOperand(ecx, Map::kInstanceTypeOffset), kAsciiStringTag);
__ j(zero, &non_ascii_string_add_flat_result);
__ mov(ecx, FieldOperand(edx, HeapObject::kMapOffset));
__ test_b(FieldOperand(ecx, Map::kInstanceTypeOffset), kAsciiStringTag);
__ j(zero, &string_add_runtime);
// Both strings are ascii strings. As they are short they are both flat.
// ebx: length of resulting flat string as a smi
__ SmiUntag(ebx);
__ AllocateAsciiString(eax, ebx, ecx, edx, edi, &string_add_runtime);
// eax: result string
__ mov(ecx, eax);
// Locate first character of result.
__ add(Operand(ecx), Immediate(SeqAsciiString::kHeaderSize - kHeapObjectTag));
// Load first argument and locate first character.
__ mov(edx, Operand(esp, 2 * kPointerSize));
__ mov(edi, FieldOperand(edx, String::kLengthOffset));
__ SmiUntag(edi);
__ add(Operand(edx), Immediate(SeqAsciiString::kHeaderSize - kHeapObjectTag));
// eax: result string
// ecx: first character of result
// edx: first char of first argument
// edi: length of first argument
StringHelper::GenerateCopyCharacters(masm, ecx, edx, edi, ebx, true);
// Load second argument and locate first character.
__ mov(edx, Operand(esp, 1 * kPointerSize));
__ mov(edi, FieldOperand(edx, String::kLengthOffset));
__ SmiUntag(edi);
__ add(Operand(edx), Immediate(SeqAsciiString::kHeaderSize - kHeapObjectTag));
// eax: result string
// ecx: next character of result
// edx: first char of second argument
// edi: length of second argument
StringHelper::GenerateCopyCharacters(masm, ecx, edx, edi, ebx, true);
__ IncrementCounter(&Counters::string_add_native, 1);
__ ret(2 * kPointerSize);
// Handle creating a flat two byte result.
// eax: first string - known to be two byte
// ebx: length of resulting flat string as a smi
// edx: second string
__ bind(&non_ascii_string_add_flat_result);
__ mov(ecx, FieldOperand(edx, HeapObject::kMapOffset));
__ test_b(FieldOperand(ecx, Map::kInstanceTypeOffset), kAsciiStringTag);
__ j(not_zero, &string_add_runtime);
// Both strings are two byte strings. As they are short they are both
// flat.
__ SmiUntag(ebx);
__ AllocateTwoByteString(eax, ebx, ecx, edx, edi, &string_add_runtime);
// eax: result string
__ mov(ecx, eax);
// Locate first character of result.
__ add(Operand(ecx),
Immediate(SeqTwoByteString::kHeaderSize - kHeapObjectTag));
// Load first argument and locate first character.
__ mov(edx, Operand(esp, 2 * kPointerSize));
__ mov(edi, FieldOperand(edx, String::kLengthOffset));
__ SmiUntag(edi);
__ add(Operand(edx),
Immediate(SeqTwoByteString::kHeaderSize - kHeapObjectTag));
// eax: result string
// ecx: first character of result
// edx: first char of first argument
// edi: length of first argument
StringHelper::GenerateCopyCharacters(masm, ecx, edx, edi, ebx, false);
// Load second argument and locate first character.
__ mov(edx, Operand(esp, 1 * kPointerSize));
__ mov(edi, FieldOperand(edx, String::kLengthOffset));
__ SmiUntag(edi);
__ add(Operand(edx), Immediate(SeqAsciiString::kHeaderSize - kHeapObjectTag));
// eax: result string
// ecx: next character of result
// edx: first char of second argument
// edi: length of second argument
StringHelper::GenerateCopyCharacters(masm, ecx, edx, edi, ebx, false);
__ IncrementCounter(&Counters::string_add_native, 1);
__ ret(2 * kPointerSize);
// Just jump to runtime to add the two strings.
__ bind(&string_add_runtime);
__ TailCallRuntime(Runtime::kStringAdd, 2, 1);
if (call_builtin.is_linked()) {
__ bind(&call_builtin);
__ InvokeBuiltin(builtin_id, JUMP_FUNCTION);
}
}
void StringAddStub::GenerateConvertArgument(MacroAssembler* masm,
int stack_offset,
Register arg,
Register scratch1,
Register scratch2,
Register scratch3,
Label* slow) {
// First check if the argument is already a string.
Label not_string, done;
__ test(arg, Immediate(kSmiTagMask));
__ j(zero, &not_string);
__ CmpObjectType(arg, FIRST_NONSTRING_TYPE, scratch1);
__ j(below, &done);
// Check the number to string cache.
Label not_cached;
__ bind(&not_string);
// Puts the cached result into scratch1.
NumberToStringStub::GenerateLookupNumberStringCache(masm,
arg,
scratch1,
scratch2,
scratch3,
false,
&not_cached);
__ mov(arg, scratch1);
__ mov(Operand(esp, stack_offset), arg);
__ jmp(&done);
// Check if the argument is a safe string wrapper.
__ bind(&not_cached);
__ test(arg, Immediate(kSmiTagMask));
__ j(zero, slow);
__ CmpObjectType(arg, JS_VALUE_TYPE, scratch1); // map -> scratch1.
__ j(not_equal, slow);
__ test_b(FieldOperand(scratch1, Map::kBitField2Offset),
1 << Map::kStringWrapperSafeForDefaultValueOf);
__ j(zero, slow);
__ mov(arg, FieldOperand(arg, JSValue::kValueOffset));
__ mov(Operand(esp, stack_offset), arg);
__ bind(&done);
}
void StringHelper::GenerateCopyCharacters(MacroAssembler* masm,
Register dest,
Register src,
Register count,
Register scratch,
bool ascii) {
Label loop;
__ bind(&loop);
// This loop just copies one character at a time, as it is only used for very
// short strings.
if (ascii) {
__ mov_b(scratch, Operand(src, 0));
__ mov_b(Operand(dest, 0), scratch);
__ add(Operand(src), Immediate(1));
__ add(Operand(dest), Immediate(1));
} else {
__ mov_w(scratch, Operand(src, 0));
__ mov_w(Operand(dest, 0), scratch);
__ add(Operand(src), Immediate(2));
__ add(Operand(dest), Immediate(2));
}
__ sub(Operand(count), Immediate(1));
__ j(not_zero, &loop);
}
void StringHelper::GenerateCopyCharactersREP(MacroAssembler* masm,
Register dest,
Register src,
Register count,
Register scratch,
bool ascii) {
// Copy characters using rep movs of doublewords.
// The destination is aligned on a 4 byte boundary because we are
// copying to the beginning of a newly allocated string.
ASSERT(dest.is(edi)); // rep movs destination
ASSERT(src.is(esi)); // rep movs source
ASSERT(count.is(ecx)); // rep movs count
ASSERT(!scratch.is(dest));
ASSERT(!scratch.is(src));
ASSERT(!scratch.is(count));
// Nothing to do for zero characters.
Label done;
__ test(count, Operand(count));
__ j(zero, &done);
// Make count the number of bytes to copy.
if (!ascii) {
__ shl(count, 1);
}
// Don't enter the rep movs if there are less than 4 bytes to copy.
Label last_bytes;
__ test(count, Immediate(~3));
__ j(zero, &last_bytes);
// Copy from edi to esi using rep movs instruction.
__ mov(scratch, count);
__ sar(count, 2); // Number of doublewords to copy.
__ cld();
__ rep_movs();
// Find number of bytes left.
__ mov(count, scratch);
__ and_(count, 3);
// Check if there are more bytes to copy.
__ bind(&last_bytes);
__ test(count, Operand(count));
__ j(zero, &done);
// Copy remaining characters.
Label loop;
__ bind(&loop);
__ mov_b(scratch, Operand(src, 0));
__ mov_b(Operand(dest, 0), scratch);
__ add(Operand(src), Immediate(1));
__ add(Operand(dest), Immediate(1));
__ sub(Operand(count), Immediate(1));
__ j(not_zero, &loop);
__ bind(&done);
}
void StringHelper::GenerateTwoCharacterSymbolTableProbe(MacroAssembler* masm,
Register c1,
Register c2,
Register scratch1,
Register scratch2,
Register scratch3,
Label* not_probed,
Label* not_found) {
// Register scratch3 is the general scratch register in this function.
Register scratch = scratch3;
// Make sure that both characters are not digits as such strings has a
// different hash algorithm. Don't try to look for these in the symbol table.
Label not_array_index;
__ mov(scratch, c1);
__ sub(Operand(scratch), Immediate(static_cast<int>('0')));
__ cmp(Operand(scratch), Immediate(static_cast<int>('9' - '0')));
__ j(above, &not_array_index);
__ mov(scratch, c2);
__ sub(Operand(scratch), Immediate(static_cast<int>('0')));
__ cmp(Operand(scratch), Immediate(static_cast<int>('9' - '0')));
__ j(below_equal, not_probed);
__ bind(&not_array_index);
// Calculate the two character string hash.
Register hash = scratch1;
GenerateHashInit(masm, hash, c1, scratch);
GenerateHashAddCharacter(masm, hash, c2, scratch);
GenerateHashGetHash(masm, hash, scratch);
// Collect the two characters in a register.
Register chars = c1;
__ shl(c2, kBitsPerByte);
__ or_(chars, Operand(c2));
// chars: two character string, char 1 in byte 0 and char 2 in byte 1.
// hash: hash of two character string.
// Load the symbol table.
Register symbol_table = c2;
ExternalReference roots_address = ExternalReference::roots_address();
__ mov(scratch, Immediate(Heap::kSymbolTableRootIndex));
__ mov(symbol_table,
Operand::StaticArray(scratch, times_pointer_size, roots_address));
// Calculate capacity mask from the symbol table capacity.
Register mask = scratch2;
__ mov(mask, FieldOperand(symbol_table, SymbolTable::kCapacityOffset));
__ SmiUntag(mask);
__ sub(Operand(mask), Immediate(1));
// Registers
// chars: two character string, char 1 in byte 0 and char 2 in byte 1.
// hash: hash of two character string
// symbol_table: symbol table
// mask: capacity mask
// scratch: -
// Perform a number of probes in the symbol table.
static const int kProbes = 4;
Label found_in_symbol_table;
Label next_probe[kProbes], next_probe_pop_mask[kProbes];
for (int i = 0; i < kProbes; i++) {
// Calculate entry in symbol table.
__ mov(scratch, hash);
if (i > 0) {
__ add(Operand(scratch), Immediate(SymbolTable::GetProbeOffset(i)));
}
__ and_(scratch, Operand(mask));
// Load the entry from the symbol table.
Register candidate = scratch; // Scratch register contains candidate.
STATIC_ASSERT(SymbolTable::kEntrySize == 1);
__ mov(candidate,
FieldOperand(symbol_table,
scratch,
times_pointer_size,
SymbolTable::kElementsStartOffset));
// If entry is undefined no string with this hash can be found.
__ cmp(candidate, Factory::undefined_value());
__ j(equal, not_found);
// If length is not 2 the string is not a candidate.
__ cmp(FieldOperand(candidate, String::kLengthOffset),
Immediate(Smi::FromInt(2)));
__ j(not_equal, &next_probe[i]);
// As we are out of registers save the mask on the stack and use that
// register as a temporary.
__ push(mask);
Register temp = mask;
// Check that the candidate is a non-external ascii string.
__ mov(temp, FieldOperand(candidate, HeapObject::kMapOffset));
__ movzx_b(temp, FieldOperand(temp, Map::kInstanceTypeOffset));
__ JumpIfInstanceTypeIsNotSequentialAscii(
temp, temp, &next_probe_pop_mask[i]);
// Check if the two characters match.
__ mov(temp, FieldOperand(candidate, SeqAsciiString::kHeaderSize));
__ and_(temp, 0x0000ffff);
__ cmp(chars, Operand(temp));
__ j(equal, &found_in_symbol_table);
__ bind(&next_probe_pop_mask[i]);
__ pop(mask);
__ bind(&next_probe[i]);
}
// No matching 2 character string found by probing.
__ jmp(not_found);
// Scratch register contains result when we fall through to here.
Register result = scratch;
__ bind(&found_in_symbol_table);
__ pop(mask); // Pop saved mask from the stack.
if (!result.is(eax)) {
__ mov(eax, result);
}
}
void StringHelper::GenerateHashInit(MacroAssembler* masm,
Register hash,
Register character,
Register scratch) {
// hash = character + (character << 10);
__ mov(hash, character);
__ shl(hash, 10);
__ add(hash, Operand(character));
// hash ^= hash >> 6;
__ mov(scratch, hash);
__ sar(scratch, 6);
__ xor_(hash, Operand(scratch));
}
void StringHelper::GenerateHashAddCharacter(MacroAssembler* masm,
Register hash,
Register character,
Register scratch) {
// hash += character;
__ add(hash, Operand(character));
// hash += hash << 10;
__ mov(scratch, hash);
__ shl(scratch, 10);
__ add(hash, Operand(scratch));
// hash ^= hash >> 6;
__ mov(scratch, hash);
__ sar(scratch, 6);
__ xor_(hash, Operand(scratch));
}
void StringHelper::GenerateHashGetHash(MacroAssembler* masm,
Register hash,
Register scratch) {
// hash += hash << 3;
__ mov(scratch, hash);
__ shl(scratch, 3);
__ add(hash, Operand(scratch));
// hash ^= hash >> 11;
__ mov(scratch, hash);
__ sar(scratch, 11);
__ xor_(hash, Operand(scratch));
// hash += hash << 15;
__ mov(scratch, hash);
__ shl(scratch, 15);
__ add(hash, Operand(scratch));
// if (hash == 0) hash = 27;
Label hash_not_zero;
__ test(hash, Operand(hash));
__ j(not_zero, &hash_not_zero);
__ mov(hash, Immediate(27));
__ bind(&hash_not_zero);
}
void SubStringStub::Generate(MacroAssembler* masm) {
Label runtime;
// Stack frame on entry.
// esp[0]: return address
// esp[4]: to
// esp[8]: from
// esp[12]: string
// Make sure first argument is a string.
__ mov(eax, Operand(esp, 3 * kPointerSize));
STATIC_ASSERT(kSmiTag == 0);
__ test(eax, Immediate(kSmiTagMask));
__ j(zero, &runtime);
Condition is_string = masm->IsObjectStringType(eax, ebx, ebx);
__ j(NegateCondition(is_string), &runtime);
// eax: string
// ebx: instance type
// Calculate length of sub string using the smi values.
Label result_longer_than_two;
__ mov(ecx, Operand(esp, 1 * kPointerSize)); // To index.
__ test(ecx, Immediate(kSmiTagMask));
__ j(not_zero, &runtime);
__ mov(edx, Operand(esp, 2 * kPointerSize)); // From index.
__ test(edx, Immediate(kSmiTagMask));
__ j(not_zero, &runtime);
__ sub(ecx, Operand(edx));
__ cmp(ecx, FieldOperand(eax, String::kLengthOffset));
Label return_eax;
__ j(equal, &return_eax);
// Special handling of sub-strings of length 1 and 2. One character strings
// are handled in the runtime system (looked up in the single character
// cache). Two character strings are looked for in the symbol cache.
__ SmiUntag(ecx); // Result length is no longer smi.
__ cmp(ecx, 2);
__ j(greater, &result_longer_than_two);
__ j(less, &runtime);
// Sub string of length 2 requested.
// eax: string
// ebx: instance type
// ecx: sub string length (value is 2)
// edx: from index (smi)
__ JumpIfInstanceTypeIsNotSequentialAscii(ebx, ebx, &runtime);
// Get the two characters forming the sub string.
__ SmiUntag(edx); // From index is no longer smi.
__ movzx_b(ebx, FieldOperand(eax, edx, times_1, SeqAsciiString::kHeaderSize));
__ movzx_b(ecx,
FieldOperand(eax, edx, times_1, SeqAsciiString::kHeaderSize + 1));
// Try to lookup two character string in symbol table.
Label make_two_character_string;
StringHelper::GenerateTwoCharacterSymbolTableProbe(
masm, ebx, ecx, eax, edx, edi,
&make_two_character_string, &make_two_character_string);
__ ret(3 * kPointerSize);
__ bind(&make_two_character_string);
// Setup registers for allocating the two character string.
__ mov(eax, Operand(esp, 3 * kPointerSize));
__ mov(ebx, FieldOperand(eax, HeapObject::kMapOffset));
__ movzx_b(ebx, FieldOperand(ebx, Map::kInstanceTypeOffset));
__ Set(ecx, Immediate(2));
__ bind(&result_longer_than_two);
// eax: string
// ebx: instance type
// ecx: result string length
// Check for flat ascii string
Label non_ascii_flat;
__ JumpIfInstanceTypeIsNotSequentialAscii(ebx, ebx, &non_ascii_flat);
// Allocate the result.
__ AllocateAsciiString(eax, ecx, ebx, edx, edi, &runtime);
// eax: result string
// ecx: result string length
__ mov(edx, esi); // esi used by following code.
// Locate first character of result.
__ mov(edi, eax);
__ add(Operand(edi), Immediate(SeqAsciiString::kHeaderSize - kHeapObjectTag));
// Load string argument and locate character of sub string start.
__ mov(esi, Operand(esp, 3 * kPointerSize));
__ add(Operand(esi), Immediate(SeqAsciiString::kHeaderSize - kHeapObjectTag));
__ mov(ebx, Operand(esp, 2 * kPointerSize)); // from
__ SmiUntag(ebx);
__ add(esi, Operand(ebx));
// eax: result string
// ecx: result length
// edx: original value of esi
// edi: first character of result
// esi: character of sub string start
StringHelper::GenerateCopyCharactersREP(masm, edi, esi, ecx, ebx, true);
__ mov(esi, edx); // Restore esi.
__ IncrementCounter(&Counters::sub_string_native, 1);
__ ret(3 * kPointerSize);
__ bind(&non_ascii_flat);
// eax: string
// ebx: instance type & kStringRepresentationMask | kStringEncodingMask
// ecx: result string length
// Check for flat two byte string
__ cmp(ebx, kSeqStringTag | kTwoByteStringTag);
__ j(not_equal, &runtime);
// Allocate the result.
__ AllocateTwoByteString(eax, ecx, ebx, edx, edi, &runtime);
// eax: result string
// ecx: result string length
__ mov(edx, esi); // esi used by following code.
// Locate first character of result.
__ mov(edi, eax);
__ add(Operand(edi),
Immediate(SeqTwoByteString::kHeaderSize - kHeapObjectTag));
// Load string argument and locate character of sub string start.
__ mov(esi, Operand(esp, 3 * kPointerSize));
__ add(Operand(esi),
Immediate(SeqTwoByteString::kHeaderSize - kHeapObjectTag));
__ mov(ebx, Operand(esp, 2 * kPointerSize)); // from
// As from is a smi it is 2 times the value which matches the size of a two
// byte character.
STATIC_ASSERT(kSmiTag == 0);
STATIC_ASSERT(kSmiTagSize + kSmiShiftSize == 1);
__ add(esi, Operand(ebx));
// eax: result string
// ecx: result length
// edx: original value of esi
// edi: first character of result
// esi: character of sub string start
StringHelper::GenerateCopyCharactersREP(masm, edi, esi, ecx, ebx, false);
__ mov(esi, edx); // Restore esi.
__ bind(&return_eax);
__ IncrementCounter(&Counters::sub_string_native, 1);
__ ret(3 * kPointerSize);
// Just jump to runtime to create the sub string.
__ bind(&runtime);
__ TailCallRuntime(Runtime::kSubString, 3, 1);
}
void StringCompareStub::GenerateCompareFlatAsciiStrings(MacroAssembler* masm,
Register left,
Register right,
Register scratch1,
Register scratch2,
Register scratch3) {
Label result_not_equal;
Label result_greater;
Label compare_lengths;
__ IncrementCounter(&Counters::string_compare_native, 1);
// Find minimum length.
Label left_shorter;
__ mov(scratch1, FieldOperand(left, String::kLengthOffset));
__ mov(scratch3, scratch1);
__ sub(scratch3, FieldOperand(right, String::kLengthOffset));
Register length_delta = scratch3;
__ j(less_equal, &left_shorter);
// Right string is shorter. Change scratch1 to be length of right string.
__ sub(scratch1, Operand(length_delta));
__ bind(&left_shorter);
Register min_length = scratch1;
// If either length is zero, just compare lengths.
__ test(min_length, Operand(min_length));
__ j(zero, &compare_lengths);
// Change index to run from -min_length to -1 by adding min_length
// to string start. This means that loop ends when index reaches zero,
// which doesn't need an additional compare.
__ SmiUntag(min_length);
__ lea(left,
FieldOperand(left,
min_length, times_1,
SeqAsciiString::kHeaderSize));
__ lea(right,
FieldOperand(right,
min_length, times_1,
SeqAsciiString::kHeaderSize));
__ neg(min_length);
Register index = min_length; // index = -min_length;
{
// Compare loop.
Label loop;
__ bind(&loop);
// Compare characters.
__ mov_b(scratch2, Operand(left, index, times_1, 0));
__ cmpb(scratch2, Operand(right, index, times_1, 0));
__ j(not_equal, &result_not_equal);
__ add(Operand(index), Immediate(1));
__ j(not_zero, &loop);
}
// Compare lengths - strings up to min-length are equal.
__ bind(&compare_lengths);
__ test(length_delta, Operand(length_delta));
__ j(not_zero, &result_not_equal);
// Result is EQUAL.
STATIC_ASSERT(EQUAL == 0);
STATIC_ASSERT(kSmiTag == 0);
__ Set(eax, Immediate(Smi::FromInt(EQUAL)));
__ ret(0);
__ bind(&result_not_equal);
__ j(greater, &result_greater);
// Result is LESS.
__ Set(eax, Immediate(Smi::FromInt(LESS)));
__ ret(0);
// Result is GREATER.
__ bind(&result_greater);
__ Set(eax, Immediate(Smi::FromInt(GREATER)));
__ ret(0);
}
void StringCompareStub::Generate(MacroAssembler* masm) {
Label runtime;
// Stack frame on entry.
// esp[0]: return address
// esp[4]: right string
// esp[8]: left string
__ mov(edx, Operand(esp, 2 * kPointerSize)); // left
__ mov(eax, Operand(esp, 1 * kPointerSize)); // right
Label not_same;
__ cmp(edx, Operand(eax));
__ j(not_equal, &not_same);
STATIC_ASSERT(EQUAL == 0);
STATIC_ASSERT(kSmiTag == 0);
__ Set(eax, Immediate(Smi::FromInt(EQUAL)));
__ IncrementCounter(&Counters::string_compare_native, 1);
__ ret(2 * kPointerSize);
__ bind(&not_same);
// Check that both objects are sequential ascii strings.
__ JumpIfNotBothSequentialAsciiStrings(edx, eax, ecx, ebx, &runtime);
// Compare flat ascii strings.
// Drop arguments from the stack.
__ pop(ecx);
__ add(Operand(esp), Immediate(2 * kPointerSize));
__ push(ecx);
GenerateCompareFlatAsciiStrings(masm, edx, eax, ecx, ebx, edi);
// Call the runtime; it returns -1 (less), 0 (equal), or 1 (greater)
// tagged as a small integer.
__ bind(&runtime);
__ TailCallRuntime(Runtime::kStringCompare, 2, 1);
}
#undef __
} } // namespace v8::internal
#endif // V8_TARGET_ARCH_IA32