// Copyright 2012 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#if V8_TARGET_ARCH_IA32
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#include "src/assembler-inl.h"
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#include "src/deoptimizer.h"
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#include "src/frame-constants.h"
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#include "src/register-configuration.h"
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#include "src/safepoint-table.h"
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namespace v8 {
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namespace internal {
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const int Deoptimizer::table_entry_size_ = 10;
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#define __ masm()->
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void Deoptimizer::TableEntryGenerator::Generate() {
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GeneratePrologue();
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// Save all general purpose registers before messing with them.
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const int kNumberOfRegisters = Register::kNumRegisters;
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const int kDoubleRegsSize = kDoubleSize * XMMRegister::kNumRegisters;
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__ sub(esp, Immediate(kDoubleRegsSize));
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const RegisterConfiguration* config = RegisterConfiguration::Default();
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for (int i = 0; i < config->num_allocatable_double_registers(); ++i) {
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int code = config->GetAllocatableDoubleCode(i);
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XMMRegister xmm_reg = XMMRegister::from_code(code);
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int offset = code * kDoubleSize;
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__ movsd(Operand(esp, offset), xmm_reg);
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}
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STATIC_ASSERT(kFloatSize == kPointerSize);
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const int kFloatRegsSize = kFloatSize * XMMRegister::kNumRegisters;
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__ sub(esp, Immediate(kFloatRegsSize));
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for (int i = 0; i < config->num_allocatable_float_registers(); ++i) {
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int code = config->GetAllocatableFloatCode(i);
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XMMRegister xmm_reg = XMMRegister::from_code(code);
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int offset = code * kFloatSize;
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__ movss(Operand(esp, offset), xmm_reg);
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}
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__ pushad();
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ExternalReference c_entry_fp_address =
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ExternalReference::Create(IsolateAddressId::kCEntryFPAddress, isolate());
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__ mov(masm()->StaticVariable(c_entry_fp_address), ebp);
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const int kSavedRegistersAreaSize =
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kNumberOfRegisters * kPointerSize + kDoubleRegsSize + kFloatRegsSize;
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// Get the bailout id from the stack.
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__ mov(ebx, Operand(esp, kSavedRegistersAreaSize));
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// Get the address of the location in the code object
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// and compute the fp-to-sp delta in register edx.
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__ mov(ecx, Operand(esp, kSavedRegistersAreaSize + 1 * kPointerSize));
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__ lea(edx, Operand(esp, kSavedRegistersAreaSize + 2 * kPointerSize));
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__ sub(edx, ebp);
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__ neg(edx);
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// Allocate a new deoptimizer object.
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__ PrepareCallCFunction(6, eax);
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__ mov(eax, Immediate(0));
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Label context_check;
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__ mov(edi, Operand(ebp, CommonFrameConstants::kContextOrFrameTypeOffset));
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__ JumpIfSmi(edi, &context_check);
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__ mov(eax, Operand(ebp, JavaScriptFrameConstants::kFunctionOffset));
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__ bind(&context_check);
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__ mov(Operand(esp, 0 * kPointerSize), eax); // Function.
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__ mov(Operand(esp, 1 * kPointerSize),
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Immediate(static_cast<int>(deopt_kind())));
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__ mov(Operand(esp, 2 * kPointerSize), ebx); // Bailout id.
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__ mov(Operand(esp, 3 * kPointerSize), ecx); // Code address or 0.
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__ mov(Operand(esp, 4 * kPointerSize), edx); // Fp-to-sp delta.
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__ mov(Operand(esp, 5 * kPointerSize),
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Immediate(ExternalReference::isolate_address(isolate())));
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{
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AllowExternalCallThatCantCauseGC scope(masm());
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__ CallCFunction(ExternalReference::new_deoptimizer_function(), 6);
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}
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// Preserve deoptimizer object in register eax and get the input
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// frame descriptor pointer.
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__ mov(ebx, Operand(eax, Deoptimizer::input_offset()));
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// Fill in the input registers.
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for (int i = kNumberOfRegisters - 1; i >= 0; i--) {
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int offset = (i * kPointerSize) + FrameDescription::registers_offset();
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__ pop(Operand(ebx, offset));
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}
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int float_regs_offset = FrameDescription::float_registers_offset();
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// Fill in the float input registers.
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for (int i = 0; i < XMMRegister::kNumRegisters; i++) {
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int dst_offset = i * kFloatSize + float_regs_offset;
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__ pop(Operand(ebx, dst_offset));
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}
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int double_regs_offset = FrameDescription::double_registers_offset();
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// Fill in the double input registers.
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for (int i = 0; i < config->num_allocatable_double_registers(); ++i) {
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int code = config->GetAllocatableDoubleCode(i);
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int dst_offset = code * kDoubleSize + double_regs_offset;
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int src_offset = code * kDoubleSize;
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__ movsd(xmm0, Operand(esp, src_offset));
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__ movsd(Operand(ebx, dst_offset), xmm0);
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}
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// Clear FPU all exceptions.
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// TODO(ulan): Find out why the TOP register is not zero here in some cases,
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// and check that the generated code never deoptimizes with unbalanced stack.
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__ fnclex();
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// Remove the bailout id, return address and the double registers.
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__ add(esp, Immediate(kDoubleRegsSize + 2 * kPointerSize));
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// Compute a pointer to the unwinding limit in register ecx; that is
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// the first stack slot not part of the input frame.
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__ mov(ecx, Operand(ebx, FrameDescription::frame_size_offset()));
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__ add(ecx, esp);
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// Unwind the stack down to - but not including - the unwinding
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// limit and copy the contents of the activation frame to the input
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// frame description.
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__ lea(edx, Operand(ebx, FrameDescription::frame_content_offset()));
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Label pop_loop_header;
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__ jmp(&pop_loop_header);
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Label pop_loop;
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__ bind(&pop_loop);
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__ pop(Operand(edx, 0));
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__ add(edx, Immediate(sizeof(uint32_t)));
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__ bind(&pop_loop_header);
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__ cmp(ecx, esp);
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__ j(not_equal, &pop_loop);
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// Compute the output frame in the deoptimizer.
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__ push(eax);
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__ PrepareCallCFunction(1, ebx);
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__ mov(Operand(esp, 0 * kPointerSize), eax);
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{
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AllowExternalCallThatCantCauseGC scope(masm());
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__ CallCFunction(ExternalReference::compute_output_frames_function(), 1);
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}
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__ pop(eax);
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__ mov(esp, Operand(eax, Deoptimizer::caller_frame_top_offset()));
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// Replace the current (input) frame with the output frames.
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Label outer_push_loop, inner_push_loop,
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outer_loop_header, inner_loop_header;
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// Outer loop state: eax = current FrameDescription**, edx = one past the
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// last FrameDescription**.
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__ mov(edx, Operand(eax, Deoptimizer::output_count_offset()));
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__ mov(eax, Operand(eax, Deoptimizer::output_offset()));
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__ lea(edx, Operand(eax, edx, times_4, 0));
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__ jmp(&outer_loop_header);
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__ bind(&outer_push_loop);
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// Inner loop state: ebx = current FrameDescription*, ecx = loop index.
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__ mov(ebx, Operand(eax, 0));
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__ mov(ecx, Operand(ebx, FrameDescription::frame_size_offset()));
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__ jmp(&inner_loop_header);
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__ bind(&inner_push_loop);
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__ sub(ecx, Immediate(sizeof(uint32_t)));
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__ push(Operand(ebx, ecx, times_1, FrameDescription::frame_content_offset()));
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__ bind(&inner_loop_header);
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__ test(ecx, ecx);
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__ j(not_zero, &inner_push_loop);
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__ add(eax, Immediate(kPointerSize));
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__ bind(&outer_loop_header);
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__ cmp(eax, edx);
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__ j(below, &outer_push_loop);
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// In case of a failed STUB, we have to restore the XMM registers.
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for (int i = 0; i < config->num_allocatable_double_registers(); ++i) {
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int code = config->GetAllocatableDoubleCode(i);
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XMMRegister xmm_reg = XMMRegister::from_code(code);
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int src_offset = code * kDoubleSize + double_regs_offset;
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__ movsd(xmm_reg, Operand(ebx, src_offset));
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}
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// Push pc and continuation from the last output frame.
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__ push(Operand(ebx, FrameDescription::pc_offset()));
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__ push(Operand(ebx, FrameDescription::continuation_offset()));
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// Push the registers from the last output frame.
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for (int i = 0; i < kNumberOfRegisters; i++) {
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int offset = (i * kPointerSize) + FrameDescription::registers_offset();
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__ push(Operand(ebx, offset));
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}
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// Restore the registers from the stack.
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__ popad();
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// Return to the continuation point.
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__ ret(0);
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}
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void Deoptimizer::TableEntryGenerator::GeneratePrologue() {
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// Create a sequence of deoptimization entries.
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Label done;
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for (int i = 0; i < count(); i++) {
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int start = masm()->pc_offset();
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USE(start);
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__ push_imm32(i);
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__ jmp(&done);
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DCHECK(masm()->pc_offset() - start == table_entry_size_);
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}
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__ bind(&done);
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}
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bool Deoptimizer::PadTopOfStackRegister() { return false; }
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void FrameDescription::SetCallerPc(unsigned offset, intptr_t value) {
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SetFrameSlot(offset, value);
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}
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void FrameDescription::SetCallerFp(unsigned offset, intptr_t value) {
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SetFrameSlot(offset, value);
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}
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void FrameDescription::SetCallerConstantPool(unsigned offset, intptr_t value) {
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// No embedded constant pool support.
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UNREACHABLE();
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}
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#undef __
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} // namespace internal
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} // namespace v8
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#endif // V8_TARGET_ARCH_IA32
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