[Isolates] Merge crankshaft (r5922 from bleeding_edge).

src/ia32/deoptimizer-ia32.cc

+// 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"
+
+#include "codegen.h"
+#include "deoptimizer.h"
+#include "full-codegen.h"
+#include "safepoint-table.h"
+
+namespace v8 {
+namespace internal {
+
+
+int Deoptimizer::table_entry_size_ = 10;
+
+void Deoptimizer::DeoptimizeFunction(JSFunction* function) {
+  AssertNoAllocation no_allocation;
+
+  if (!function->IsOptimized()) return;
+
+  // Get the optimized code.
+  Code* code = function->code();
+
+  // Invalidate the relocation information, as it will become invalid by the
+  // code patching below, and is not needed any more.
+  code->InvalidateRelocation();
+
+  // For each return after a safepoint insert a absolute call to the
+  // corresponding deoptimization entry.
+  unsigned last_pc_offset = 0;
+  SafepointTable table(function->code());
+  for (unsigned i = 0; i < table.length(); i++) {
+    unsigned pc_offset = table.GetPcOffset(i);
+    int deoptimization_index = table.GetDeoptimizationIndex(i);
+    int gap_code_size = table.GetGapCodeSize(i);
+#ifdef DEBUG
+    // Destroy the code which is not supposed to run again.
+    unsigned instructions = pc_offset - last_pc_offset;
+    CodePatcher destroyer(code->instruction_start() + last_pc_offset,
+                          instructions);
+    for (unsigned i = 0; i < instructions; i++) {
+      destroyer.masm()->int3();
+    }
+#endif
+    last_pc_offset = pc_offset;
+    if (deoptimization_index != Safepoint::kNoDeoptimizationIndex) {
+      CodePatcher patcher(
+          code->instruction_start() + pc_offset + gap_code_size,
+          Assembler::kCallInstructionLength);
+      patcher.masm()->call(GetDeoptimizationEntry(deoptimization_index, LAZY),
+                           RelocInfo::NONE);
+      last_pc_offset += gap_code_size + Assembler::kCallInstructionLength;
+    }
+  }
+#ifdef DEBUG
+  // Destroy the code which is not supposed to run again.
+  unsigned instructions = code->safepoint_table_start() - last_pc_offset;
+  CodePatcher destroyer(code->instruction_start() + last_pc_offset,
+                        instructions);
+  for (unsigned i = 0; i < instructions; i++) {
+    destroyer.masm()->int3();
+  }
+#endif
+
+  // Add the deoptimizing code to the list.
+  DeoptimizingCodeListNode* node = new DeoptimizingCodeListNode(code);
+  DeoptimizerData* data = Isolate::Current()->deoptimizer_data();
+  node->set_next(data->deoptimizing_code_list_);
+  data->deoptimizing_code_list_ = node;
+
+  // Set the code for the function to non-optimized version.
+  function->ReplaceCode(function->shared()->code());
+
+  if (FLAG_trace_deopt) {
+    PrintF("[forced deoptimization: ");
+    function->PrintName();
+    PrintF(" / %x]\n", reinterpret_cast<uint32_t>(function));
+  }
+}
+
+
+void Deoptimizer::PatchStackCheckCode(RelocInfo* rinfo,
+                                      Code* replacement_code) {
+  // The stack check code matches the pattern (on ia32, for example):
+  //
+  //     cmp esp, <limit>
+  //     jae ok
+  //     call <stack guard>
+  // ok: ...
+  //
+  // We will patch the code to:
+  //
+  //     cmp esp, <limit>  ;; Not changed
+  //     nop
+  //     nop
+  //     call <on-stack replacment>
+  // ok:
+  Address call_target_address = rinfo->pc();
+  ASSERT(*(call_target_address - 3) == 0x73 &&  // jae
+         *(call_target_address - 2) == 0x05 &&  // offset
+         *(call_target_address - 1) == 0xe8);   // call
+  *(call_target_address - 3) = 0x90;  // nop
+  *(call_target_address - 2) = 0x90;  // nop
+  rinfo->set_target_address(replacement_code->entry());
+}
+
+
+void Deoptimizer::RevertStackCheckCode(RelocInfo* rinfo, Code* check_code) {
+  Address call_target_address = rinfo->pc();
+  ASSERT(*(call_target_address - 3) == 0x90 &&  // nop
+         *(call_target_address - 2) == 0x90 &&  // nop
+         *(call_target_address - 1) == 0xe8);   // call
+  *(call_target_address - 3) = 0x73;  // jae
+  *(call_target_address - 2) = 0x05;  // offset
+  rinfo->set_target_address(check_code->entry());
+}
+
+
+static int LookupBailoutId(DeoptimizationInputData* data, unsigned ast_id) {
+  ByteArray* translations = data->TranslationByteArray();
+  int length = data->DeoptCount();
+  for (int i = 0; i < length; i++) {
+    if (static_cast<unsigned>(data->AstId(i)->value()) == ast_id) {
+      TranslationIterator it(translations,  data->TranslationIndex(i)->value());
+      int value = it.Next();
+      ASSERT(Translation::BEGIN == static_cast<Translation::Opcode>(value));
+      // Read the number of frames.
+      value = it.Next();
+      if (value == 1) return i;
+    }
+  }
+  UNREACHABLE();
+  return -1;
+}
+
+
+void Deoptimizer::DoComputeOsrOutputFrame() {
+  DeoptimizationInputData* data = DeoptimizationInputData::cast(
+      optimized_code_->deoptimization_data());
+  unsigned ast_id = data->OsrAstId()->value();
+  // TODO(kasperl): This should not be the bailout_id_. It should be
+  // the ast id. Confusing.
+  ASSERT(bailout_id_ == ast_id);
+
+  int bailout_id = LookupBailoutId(data, ast_id);
+  unsigned translation_index = data->TranslationIndex(bailout_id)->value();
+  ByteArray* translations = data->TranslationByteArray();
+
+  TranslationIterator iterator(translations, translation_index);
+  Translation::Opcode opcode =
+      static_cast<Translation::Opcode>(iterator.Next());
+  ASSERT(Translation::BEGIN == opcode);
+  USE(opcode);
+  int count = iterator.Next();
+  ASSERT(count == 1);
+  USE(count);
+
+  opcode = static_cast<Translation::Opcode>(iterator.Next());
+  USE(opcode);
+  ASSERT(Translation::FRAME == opcode);
+  unsigned node_id = iterator.Next();
+  USE(node_id);
+  ASSERT(node_id == ast_id);
+  JSFunction* function = JSFunction::cast(ComputeLiteral(iterator.Next()));
+  USE(function);
+  ASSERT(function == function_);
+  unsigned height = iterator.Next();
+  unsigned height_in_bytes = height * kPointerSize;
+  USE(height_in_bytes);
+
+  unsigned fixed_size = ComputeFixedSize(function_);
+  unsigned input_frame_size = input_->GetFrameSize();
+  ASSERT(fixed_size + height_in_bytes == input_frame_size);
+
+  unsigned stack_slot_size = optimized_code_->stack_slots() * kPointerSize;
+  unsigned outgoing_height = data->ArgumentsStackHeight(bailout_id)->value();
+  unsigned outgoing_size = outgoing_height * kPointerSize;
+  unsigned output_frame_size = fixed_size + stack_slot_size + outgoing_size;
+  ASSERT(outgoing_size == 0);  // OSR does not happen in the middle of a call.
+
+  if (FLAG_trace_osr) {
+    PrintF("[on-stack replacement: begin 0x%08" V8PRIxPTR " ",
+           reinterpret_cast<intptr_t>(function_));
+    function_->PrintName();
+    PrintF(" => node=%u, frame=%d->%d]\n",
+           ast_id,
+           input_frame_size,
+           output_frame_size);
+  }
+
+  // There's only one output frame in the OSR case.
+  output_count_ = 1;
+  output_ = new FrameDescription*[1];
+  output_[0] = new(output_frame_size) FrameDescription(
+      output_frame_size, function_);
+
+  // Clear the incoming parameters in the optimized frame to avoid
+  // confusing the garbage collector.
+  unsigned output_offset = output_frame_size - kPointerSize;
+  int parameter_count = function_->shared()->formal_parameter_count() + 1;
+  for (int i = 0; i < parameter_count; ++i) {
+    output_[0]->SetFrameSlot(output_offset, 0);
+    output_offset -= kPointerSize;
+  }
+
+  // Translate the incoming parameters. This may overwrite some of the
+  // incoming argument slots we've just cleared.
+  int input_offset = input_frame_size - kPointerSize;
+  bool ok = true;
+  int limit = input_offset - (parameter_count * kPointerSize);
+  while (ok && input_offset > limit) {
+    ok = DoOsrTranslateCommand(&iterator, &input_offset);
+  }
+
+  // There are no translation commands for the caller's pc and fp, the
+  // context, and the function.  Set them up explicitly.
+  for (int i = 0; ok && i < 4; i++) {
+    uint32_t input_value = input_->GetFrameSlot(input_offset);
+    if (FLAG_trace_osr) {
+      PrintF("    [esp + %d] <- 0x%08x ; [esp + %d] (fixed part)\n",
+             output_offset,
+             input_value,
+             input_offset);
+    }
+    output_[0]->SetFrameSlot(output_offset, input_->GetFrameSlot(input_offset));
+    input_offset -= kPointerSize;
+    output_offset -= kPointerSize;
+  }
+
+  // Translate the rest of the frame.
+  while (ok && input_offset >= 0) {
+    ok = DoOsrTranslateCommand(&iterator, &input_offset);
+  }
+
+  // If translation of any command failed, continue using the input frame.
+  if (!ok) {
+    delete output_[0];
+    output_[0] = input_;
+    output_[0]->SetPc(reinterpret_cast<uint32_t>(from_));
+  } else {
+    // Setup the frame pointer and the context pointer.
+    output_[0]->SetRegister(ebp.code(), input_->GetRegister(ebp.code()));
+    output_[0]->SetRegister(esi.code(), input_->GetRegister(esi.code()));
+
+    unsigned pc_offset = data->OsrPcOffset()->value();
+    uint32_t pc = reinterpret_cast<uint32_t>(
+        optimized_code_->entry() + pc_offset);
+    output_[0]->SetPc(pc);
+  }
+  Code* continuation =
+      Isolate::Current()->builtins()->builtin(Builtins::NotifyOSR);
+  output_[0]->SetContinuation(
+      reinterpret_cast<uint32_t>(continuation->entry()));
+
+  if (FLAG_trace_osr) {
+    PrintF("[on-stack replacement translation %s: 0x%08" V8PRIxPTR " ",
+           ok ? "finished" : "aborted",
+           reinterpret_cast<intptr_t>(function));
+    function->PrintName();
+    PrintF(" => pc=0x%0x]\n", output_[0]->GetPc());
+  }
+}
+
+
+void Deoptimizer::DoComputeFrame(TranslationIterator* iterator,
+                                 int frame_index) {
+  // Read the ast node id, function, and frame height for this output frame.
+  Translation::Opcode opcode =
+      static_cast<Translation::Opcode>(iterator->Next());
+  USE(opcode);
+  ASSERT(Translation::FRAME == opcode);
+  int node_id = iterator->Next();
+  JSFunction* function = JSFunction::cast(ComputeLiteral(iterator->Next()));
+  unsigned height = iterator->Next();
+  unsigned height_in_bytes = height * kPointerSize;
+  if (FLAG_trace_deopt) {
+    PrintF("  translating ");
+    function->PrintName();
+    PrintF(" => node=%d, height=%d\n", node_id, height_in_bytes);
+  }
+
+  // The 'fixed' part of the frame consists of the incoming parameters and
+  // the part described by JavaScriptFrameConstants.
+  unsigned fixed_frame_size = ComputeFixedSize(function);
+  unsigned input_frame_size = input_->GetFrameSize();
+  unsigned output_frame_size = height_in_bytes + fixed_frame_size;
+
+  // Allocate and store the output frame description.
+  FrameDescription* output_frame =
+      new(output_frame_size) FrameDescription(output_frame_size, function);
+
+  bool is_bottommost = (0 == frame_index);
+  bool is_topmost = (output_count_ - 1 == frame_index);
+  ASSERT(frame_index >= 0 && frame_index < output_count_);
+  ASSERT(output_[frame_index] == NULL);
+  output_[frame_index] = output_frame;
+
+  // The top address for the bottommost output frame can be computed from
+  // the input frame pointer and the output frame's height.  For all
+  // subsequent output frames, it can be computed from the previous one's
+  // top address and the current frame's size.
+  uint32_t top_address;
+  if (is_bottommost) {
+    // 2 = context and function in the frame.
+    top_address =
+        input_->GetRegister(ebp.code()) - (2 * kPointerSize) - height_in_bytes;
+  } else {
+    top_address = output_[frame_index - 1]->GetTop() - output_frame_size;
+  }
+  output_frame->SetTop(top_address);
+
+  // Compute the incoming parameter translation.
+  int parameter_count = function->shared()->formal_parameter_count() + 1;
+  unsigned output_offset = output_frame_size;
+  unsigned input_offset = input_frame_size;
+  for (int i = 0; i < parameter_count; ++i) {
+    output_offset -= kPointerSize;
+    DoTranslateCommand(iterator, frame_index, output_offset);
+  }
+  input_offset -= (parameter_count * kPointerSize);
+
+  // There are no translation commands for the caller's pc and fp, the
+  // context, and the function.  Synthesize their values and set them up
+  // explicitly.
+  //
+  // The caller's pc for the bottommost output frame is the same as in the
+  // input frame.  For all subsequent output frames, it can be read from the
+  // previous one.  This frame's pc can be computed from the non-optimized
+  // function code and AST id of the bailout.
+  output_offset -= kPointerSize;
+  input_offset -= kPointerSize;
+  uint32_t value;
+  if (is_bottommost) {
+    value = input_->GetFrameSlot(input_offset);
+  } else {
+    value = output_[frame_index - 1]->GetPc();
+  }
+  output_frame->SetFrameSlot(output_offset, value);
+  if (FLAG_trace_deopt) {
+    PrintF("    0x%08x: [top + %d] <- 0x%08x ; caller's pc\n",
+           top_address + output_offset, output_offset, value);
+  }
+
+  // The caller's frame pointer for the bottommost output frame is the same
+  // as in the input frame.  For all subsequent output frames, it can be
+  // read from the previous one.  Also compute and set this frame's frame
+  // pointer.
+  output_offset -= kPointerSize;
+  input_offset -= kPointerSize;
+  if (is_bottommost) {
+    value = input_->GetFrameSlot(input_offset);
+  } else {
+    value = output_[frame_index - 1]->GetFp();
+  }
+  output_frame->SetFrameSlot(output_offset, value);
+  unsigned fp_value = top_address + output_offset;
+  ASSERT(!is_bottommost || input_->GetRegister(ebp.code()) == fp_value);
+  output_frame->SetFp(fp_value);
+  if (is_topmost) output_frame->SetRegister(ebp.code(), fp_value);
+  if (FLAG_trace_deopt) {
+    PrintF("    0x%08x: [top + %d] <- 0x%08x ; caller's fp\n",
+           fp_value, output_offset, value);
+  }
+
+  // The context can be gotten from the function so long as we don't
+  // optimize functions that need local contexts.
+  output_offset -= kPointerSize;
+  input_offset -= kPointerSize;
+  value = reinterpret_cast<uint32_t>(function->context());
+  // The context for the bottommost output frame should also agree with the
+  // input frame.
+  ASSERT(!is_bottommost || input_->GetFrameSlot(input_offset) == value);
+  output_frame->SetFrameSlot(output_offset, value);
+  if (is_topmost) output_frame->SetRegister(esi.code(), value);
+  if (FLAG_trace_deopt) {
+    PrintF("    0x%08x: [top + %d] <- 0x%08x ; context\n",
+           top_address + output_offset, output_offset, value);
+  }
+
+  // The function was mentioned explicitly in the BEGIN_FRAME.
+  output_offset -= kPointerSize;
+  input_offset -= kPointerSize;
+  value = reinterpret_cast<uint32_t>(function);
+  // The function for the bottommost output frame should also agree with the
+  // input frame.
+  ASSERT(!is_bottommost || input_->GetFrameSlot(input_offset) == value);
+  output_frame->SetFrameSlot(output_offset, value);
+  if (FLAG_trace_deopt) {
+    PrintF("    0x%08x: [top + %d] <- 0x%08x ; function\n",
+           top_address + output_offset, output_offset, value);
+  }
+
+  // Translate the rest of the frame.
+  for (unsigned i = 0; i < height; ++i) {
+    output_offset -= kPointerSize;
+    DoTranslateCommand(iterator, frame_index, output_offset);
+  }
+  ASSERT(0 == output_offset);
+
+  // Compute this frame's PC, state, and continuation.
+  Code* non_optimized_code = function->shared()->code();
+  FixedArray* raw_data = non_optimized_code->deoptimization_data();
+  DeoptimizationOutputData* data = DeoptimizationOutputData::cast(raw_data);
+  Address start = non_optimized_code->instruction_start();
+  unsigned pc_and_state = GetOutputInfo(data, node_id, function->shared());
+  unsigned pc_offset = FullCodeGenerator::PcField::decode(pc_and_state);
+  uint32_t pc_value = reinterpret_cast<uint32_t>(start + pc_offset);
+  output_frame->SetPc(pc_value);
+
+  FullCodeGenerator::State state =
+      FullCodeGenerator::StateField::decode(pc_and_state);
+  output_frame->SetState(Smi::FromInt(state));
+
+  // Set the continuation for the topmost frame.
+  if (is_topmost) {
+    Builtins* builtins = isolate_->builtins();
+    Code* continuation = (bailout_type_ == EAGER)
+        ? builtins->builtin(Builtins::NotifyDeoptimized)
+        : builtins->builtin(Builtins::NotifyLazyDeoptimized);
+    output_frame->SetContinuation(
+        reinterpret_cast<uint32_t>(continuation->entry()));
+  }
+
+  if (output_count_ - 1 == frame_index) iterator->Done();
+}
+
+
+#define __ masm()->
+
+void Deoptimizer::EntryGenerator::Generate() {
+  GeneratePrologue();
+  CpuFeatures::Scope scope(SSE2);
+
+  // Save all general purpose registers before messing with them.
+  const int kNumberOfRegisters = Register::kNumRegisters;
+
+  const int kDoubleRegsSize = kDoubleSize *
+                              XMMRegister::kNumAllocatableRegisters;
+  __ sub(Operand(esp), Immediate(kDoubleRegsSize));
+  for (int i = 0; i < XMMRegister::kNumAllocatableRegisters; ++i) {
+    XMMRegister xmm_reg = XMMRegister::FromAllocationIndex(i);
+    int offset = i * kDoubleSize;
+    __ movdbl(Operand(esp, offset), xmm_reg);
+  }
+
+  __ pushad();
+
+  const int kSavedRegistersAreaSize = kNumberOfRegisters * kPointerSize +
+                                      kDoubleRegsSize;
+
+  // Get the bailout id from the stack.
+  __ mov(ebx, Operand(esp, kSavedRegistersAreaSize));
+
+  // Get the address of the location in the code object if possible
+  // and compute the fp-to-sp delta in register edx.
+  if (type() == EAGER) {
+    __ Set(ecx, Immediate(0));
+    __ lea(edx, Operand(esp, kSavedRegistersAreaSize + 1 * kPointerSize));
+  } else {
+    __ mov(ecx, Operand(esp, kSavedRegistersAreaSize + 1 * kPointerSize));
+    __ lea(edx, Operand(esp, kSavedRegistersAreaSize + 2 * kPointerSize));
+  }
+  __ sub(edx, Operand(ebp));
+  __ neg(edx);
+
+  // Allocate a new deoptimizer object.
+  __ PrepareCallCFunction(5, eax);
+  __ mov(eax, Operand(ebp, JavaScriptFrameConstants::kFunctionOffset));
+  __ mov(Operand(esp, 0 * kPointerSize), eax);  // Function.
+  __ mov(Operand(esp, 1 * kPointerSize), Immediate(type()));  // Bailout type.
+  __ mov(Operand(esp, 2 * kPointerSize), ebx);  // Bailout id.
+  __ mov(Operand(esp, 3 * kPointerSize), ecx);  // Code address or 0.
+  __ mov(Operand(esp, 4 * kPointerSize), edx);  // Fp-to-sp delta.
+  __ CallCFunction(ExternalReference::new_deoptimizer_function(), 5);
+
+  // Preserve deoptimizer object in register eax and get the input
+  // frame descriptor pointer.
+  __ mov(ebx, Operand(eax, Deoptimizer::input_offset()));
+
+  // Fill in the input registers.
+  for (int i = 0; i < kNumberOfRegisters; i++) {
+    int offset = (i * kIntSize) + FrameDescription::registers_offset();
+    __ mov(ecx, Operand(esp, (kNumberOfRegisters - 1 - i) * kPointerSize));
+    __ mov(Operand(ebx, offset), ecx);
+  }
+
+  // Fill in the double input registers.
+  int double_regs_offset = FrameDescription::double_registers_offset();
+  for (int i = 0; i < XMMRegister::kNumAllocatableRegisters; ++i) {
+    int dst_offset = i * kDoubleSize + double_regs_offset;
+    int src_offset = i * kDoubleSize + kNumberOfRegisters * kPointerSize;
+    __ movdbl(xmm0, Operand(esp, src_offset));
+    __ movdbl(Operand(ebx, dst_offset), xmm0);
+  }
+
+  // Remove the bailout id and the general purpose registers from the stack.
+  if (type() == EAGER) {
+    __ add(Operand(esp), Immediate(kSavedRegistersAreaSize + kPointerSize));
+  } else {
+    __ add(Operand(esp), Immediate(kSavedRegistersAreaSize + 2 * kPointerSize));
+  }
+
+  // Compute a pointer to the unwinding limit in register ecx; that is
+  // the first stack slot not part of the input frame.
+  __ mov(ecx, Operand(ebx, FrameDescription::frame_size_offset()));
+  __ add(ecx, Operand(esp));
+
+  // Unwind the stack down to - but not including - the unwinding
+  // limit and copy the contents of the activation frame to the input
+  // frame description.
+  __ lea(edx, Operand(ebx, FrameDescription::frame_content_offset()));
+  Label pop_loop;
+  __ bind(&pop_loop);
+  __ pop(Operand(edx, 0));
+  __ add(Operand(edx), Immediate(sizeof(uint32_t)));
+  __ cmp(ecx, Operand(esp));
+  __ j(not_equal, &pop_loop);
+
+  // Compute the output frame in the deoptimizer.
+  __ push(eax);
+  __ PrepareCallCFunction(1, ebx);
+  __ mov(Operand(esp, 0 * kPointerSize), eax);
+  __ CallCFunction(ExternalReference::compute_output_frames_function(), 1);
+  __ pop(eax);
+
+  // Replace the current frame with the output frames.
+  Label outer_push_loop, inner_push_loop;
+  // Outer loop state: eax = current FrameDescription**, edx = one past the
+  // last FrameDescription**.
+  __ mov(edx, Operand(eax, Deoptimizer::output_count_offset()));
+  __ mov(eax, Operand(eax, Deoptimizer::output_offset()));
+  __ lea(edx, Operand(eax, edx, times_4, 0));
+  __ bind(&outer_push_loop);
+  // Inner loop state: ebx = current FrameDescription*, ecx = loop index.
+  __ mov(ebx, Operand(eax, 0));
+  __ mov(ecx, Operand(ebx, FrameDescription::frame_size_offset()));
+  __ bind(&inner_push_loop);
+  __ sub(Operand(ecx), Immediate(sizeof(uint32_t)));
+  __ push(Operand(ebx, ecx, times_1, FrameDescription::frame_content_offset()));
+  __ test(ecx, Operand(ecx));
+  __ j(not_zero, &inner_push_loop);
+  __ add(Operand(eax), Immediate(kPointerSize));
+  __ cmp(eax, Operand(edx));
+  __ j(below, &outer_push_loop);
+
+  // In case of OSR, we have to restore the XMM registers.
+  if (type() == OSR) {
+    for (int i = 0; i < XMMRegister::kNumAllocatableRegisters; ++i) {
+      XMMRegister xmm_reg = XMMRegister::FromAllocationIndex(i);
+      int src_offset = i * kDoubleSize + double_regs_offset;
+      __ movdbl(xmm_reg, Operand(ebx, src_offset));
+    }
+  }
+
+  // Push state, pc, and continuation from the last output frame.
+  if (type() != OSR) {
+    __ push(Operand(ebx, FrameDescription::state_offset()));
+  }
+  __ push(Operand(ebx, FrameDescription::pc_offset()));
+  __ push(Operand(ebx, FrameDescription::continuation_offset()));
+
+
+  // Push the registers from the last output frame.
+  for (int i = 0; i < kNumberOfRegisters; i++) {
+    int offset = (i * kIntSize) + FrameDescription::registers_offset();
+    __ push(Operand(ebx, offset));
+  }
+
+  // Restore the registers from the stack.
+  __ popad();
+
+  // Return to the continuation point.
+  __ ret(0);
+}
+
+
+void Deoptimizer::TableEntryGenerator::GeneratePrologue() {
+  // Create a sequence of deoptimization entries.
+  Label done;
+  for (int i = 0; i < count(); i++) {
+    int start = masm()->pc_offset();
+    USE(start);
+    __ push_imm32(i);
+    __ jmp(&done);
+    ASSERT(masm()->pc_offset() - start == table_entry_size_);
+  }
+  __ bind(&done);
+}
+
+#undef __
+
+
+} }  // namespace v8::internal