Move backend specific files to separate directories.

src/regexp-macro-assembler-ia32.cc

Index: src/regexp-macro-assembler-ia32.cc
diff --git a/src/regexp-macro-assembler-ia32.cc b/src/regexp-macro-assembler-ia32.cc
deleted file mode 100644
index 8c92091d23a540bfd15b4e1b27747d14a0115c2d..0000000000000000000000000000000000000000
--- a/src/regexp-macro-assembler-ia32.cc
+++ /dev/null
@@ -1,1390 +0,0 @@
-// Copyright 2008-2009 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 "unicode.h"
-#include "log.h"
-#include "ast.h"
-#include "regexp-stack.h"
-#include "macro-assembler.h"
-#include "regexp-macro-assembler.h"
-#include "macro-assembler-ia32.h"
-#include "regexp-macro-assembler-ia32.h"
-
-namespace v8 { namespace internal {
-
-/*
- * This assembler uses the following register assignment convention
- * - edx : current character. Must be loaded using LoadCurrentCharacter
- *         before using any of the dispatch methods.
- * - edi : current position in input, as negative offset from end of string.
- *         Please notice that this is the byte offset, not the character offset!
- * - esi : end of input (points to byte after last character in input).
- * - ebp : frame pointer. Used to access arguments, local variables and
- *         RegExp registers.
- * - esp : points to tip of C stack.
- * - ecx : points to tip of backtrack stack
- *
- * The registers eax, ebx and ecx are free to use for computations.
- *
- * Each call to a public method should retain this convention.
- * The stack will have the following structure:
- *       - stack_area_top     (High end of the memory area to use as
- *                             backtracking stack)
- *       - at_start           (if 1, start at start of string, if 0, don't)
- *       - int* capture_array (int[num_saved_registers_], for output).
- *       - end of input       (Address of end of string)
- *       - start of input     (Address of first character in string)
- *       - void* input_string (location of a handle containing the string)
- *       --- frame alignment (if applicable) ---
- *       - return address
- * ebp-> - old ebp
- *       - backup of caller esi
- *       - backup of caller edi
- *       - backup of caller ebx
- *       - Offset of location before start of input (effectively character
- *         position -1). Used to initialize capture registers to a non-position.
- *       - register 0  ebp[-4]  (Only positions must be stored in the first
- *       - register 1  ebp[-8]   num_saved_registers_ registers)
- *       - ...
- *
- * The first num_saved_registers_ registers are initialized to point to
- * "character -1" in the string (i.e., char_size() bytes before the first
- * character of the string). The remaining registers starts out as garbage.
- *
- * The data up to the return address must be placed there by the calling
- * code, e.g., by calling the code entry as cast to:
- * int (*match)(String* input_string,
- *              Address start,
- *              Address end,
- *              int* capture_output_array,
- *              bool at_start,
- *              byte* stack_area_top)
- */
-
-#define __ ACCESS_MASM(masm_)
-
-RegExpMacroAssemblerIA32::RegExpMacroAssemblerIA32(
-    Mode mode,
-    int registers_to_save)
-    : masm_(new MacroAssembler(NULL, kRegExpCodeSize)),
-      constants_(kRegExpConstantsSize),
-      mode_(mode),
-      num_registers_(registers_to_save),
-      num_saved_registers_(registers_to_save),
-      entry_label_(),
-      start_label_(),
-      success_label_(),
-      backtrack_label_(),
-      exit_label_() {
-  __ jmp(&entry_label_);   // We'll write the entry code later.
-  __ bind(&start_label_);  // And then continue from here.
-}
-
-
-RegExpMacroAssemblerIA32::~RegExpMacroAssemblerIA32() {
-  delete masm_;
-  // Unuse labels in case we throw away the assembler without calling GetCode.
-  entry_label_.Unuse();
-  start_label_.Unuse();
-  success_label_.Unuse();
-  backtrack_label_.Unuse();
-  exit_label_.Unuse();
-  check_preempt_label_.Unuse();
-  stack_overflow_label_.Unuse();
-}
-
-
-int RegExpMacroAssemblerIA32::stack_limit_slack()  {
-  return RegExpStack::kStackLimitSlack;
-}
-
-
-void RegExpMacroAssemblerIA32::AdvanceCurrentPosition(int by) {
-  if (by != 0) {
-    Label inside_string;
-    __ add(Operand(edi), Immediate(by * char_size()));
-  }
-}
-
-
-void RegExpMacroAssemblerIA32::AdvanceRegister(int reg, int by) {
-  ASSERT(reg >= 0);
-  ASSERT(reg < num_registers_);
-  if (by != 0) {
-    __ add(register_location(reg), Immediate(by));
-  }
-}
-
-
-void RegExpMacroAssemblerIA32::Backtrack() {
-  CheckPreemption();
-  // Pop Code* offset from backtrack stack, add Code* and jump to location.
-  Pop(ebx);
-  __ add(Operand(ebx), Immediate(masm_->CodeObject()));
-  __ jmp(Operand(ebx));
-}
-
-
-void RegExpMacroAssemblerIA32::Bind(Label* label) {
-  __ bind(label);
-}
-
-
-void RegExpMacroAssemblerIA32::CheckBitmap(uc16 start,
-                                           Label* bitmap,
-                                           Label* on_zero) {
-  UNIMPLEMENTED();
-}
-
-
-void RegExpMacroAssemblerIA32::CheckCharacter(uint32_t c, Label* on_equal) {
-  __ cmp(current_character(), c);
-  BranchOrBacktrack(equal, on_equal);
-}
-
-
-void RegExpMacroAssemblerIA32::CheckCharacterGT(uc16 limit, Label* on_greater) {
-  __ cmp(current_character(), limit);
-  BranchOrBacktrack(greater, on_greater);
-}
-
-
-void RegExpMacroAssemblerIA32::CheckAtStart(Label* on_at_start) {
-  Label not_at_start;
-  // Did we start the match at the start of the string at all?
-  __ cmp(Operand(ebp, kAtStart), Immediate(0));
-  BranchOrBacktrack(equal, &not_at_start);
-  // If we did, are we still at the start of the input?
-  __ lea(eax, Operand(esi, edi, times_1, 0));
-  __ cmp(eax, Operand(ebp, kInputStart));
-  BranchOrBacktrack(equal, on_at_start);
-  __ bind(&not_at_start);
-}
-
-
-void RegExpMacroAssemblerIA32::CheckNotAtStart(Label* on_not_at_start) {
-  // Did we start the match at the start of the string at all?
-  __ cmp(Operand(ebp, kAtStart), Immediate(0));
-  BranchOrBacktrack(equal, on_not_at_start);
-  // If we did, are we still at the start of the input?
-  __ lea(eax, Operand(esi, edi, times_1, 0));
-  __ cmp(eax, Operand(ebp, kInputStart));
-  BranchOrBacktrack(not_equal, on_not_at_start);
-}
-
-
-void RegExpMacroAssemblerIA32::CheckCharacterLT(uc16 limit, Label* on_less) {
-  __ cmp(current_character(), limit);
-  BranchOrBacktrack(less, on_less);
-}
-
-
-void RegExpMacroAssemblerIA32::CheckCharacters(Vector<const uc16> str,
-                                               int cp_offset,
-                                               Label* on_failure,
-                                               bool check_end_of_string) {
-  int byte_length = str.length() * char_size();
-  int byte_offset = cp_offset * char_size();
-  if (check_end_of_string) {
-    // Check that there are at least str.length() characters left in the input.
-    __ cmp(Operand(edi), Immediate(-(byte_offset + byte_length)));
-    BranchOrBacktrack(greater, on_failure);
-  }
-
-  Label backtrack;
-  if (on_failure == NULL) {
-    // Avoid inlining the Backtrack macro for each test.
-    Label skip_backtrack;
-    __ jmp(&skip_backtrack);
-    __ bind(&backtrack);
-    Backtrack();
-    __ bind(&skip_backtrack);
-    on_failure = &backtrack;
-  }
-
-  for (int i = 0; i < str.length(); i++) {
-    if (mode_ == ASCII) {
-      __ cmpb(Operand(esi, edi, times_1, byte_offset + i),
-              static_cast<int8_t>(str[i]));
-    } else {
-      ASSERT(mode_ == UC16);
-      __ cmpw(Operand(esi, edi, times_1, byte_offset + i * sizeof(uc16)),
-              Immediate(str[i]));
-    }
-    BranchOrBacktrack(not_equal, on_failure);
-  }
-}
-
-
-void RegExpMacroAssemblerIA32::CheckGreedyLoop(Label* on_equal) {
-  Label fallthrough;
-  __ cmp(edi, Operand(backtrack_stackpointer(), 0));
-  __ j(not_equal, &fallthrough);
-  __ add(Operand(backtrack_stackpointer()), Immediate(kPointerSize));  // Pop.
-  BranchOrBacktrack(no_condition, on_equal);
-  __ bind(&fallthrough);
-}
-
-
-void RegExpMacroAssemblerIA32::CheckNotBackReferenceIgnoreCase(
-    int start_reg,
-    Label* on_no_match) {
-  Label fallthrough;
-  __ mov(edx, register_location(start_reg));  // Index of start of capture
-  __ mov(ebx, register_location(start_reg + 1));  // Index of end of capture
-  __ sub(ebx, Operand(edx));  // Length of capture.
-
-  // The length of a capture should not be negative. This can only happen
-  // if the end of the capture is unrecorded, or at a point earlier than
-  // the start of the capture.
-  BranchOrBacktrack(less, on_no_match, not_taken);
-
-  // If length is zero, either the capture is empty or it is completely
-  // uncaptured. In either case succeed immediately.
-  __ j(equal, &fallthrough);
-
-  if (mode_ == ASCII) {
-    Label success;
-    Label fail;
-    Label loop_increment;
-    // Save register contents to make the registers available below.
-    __ push(edi);
-    __ push(backtrack_stackpointer());
-    // After this, the eax, ecx, and edi registers are available.
-
-    __ add(edx, Operand(esi));  // Start of capture
-    __ add(edi, Operand(esi));  // Start of text to match against capture.
-    __ add(ebx, Operand(edi));  // End of text to match against capture.
-
-    Label loop;
-    __ bind(&loop);
-    __ movzx_b(eax, Operand(edi, 0));
-    __ cmpb_al(Operand(edx, 0));
-    __ j(equal, &loop_increment);
-
-    // Mismatch, try case-insensitive match (converting letters to lower-case).
-    __ or_(eax, 0x20);  // Convert match character to lower-case.
-    __ lea(ecx, Operand(eax, -'a'));
-    __ cmp(ecx, static_cast<int32_t>('z' - 'a'));  // Is eax a lowercase letter?
-    __ j(above, &fail);
-    // Also convert capture character.
-    __ movzx_b(ecx, Operand(edx, 0));
-    __ or_(ecx, 0x20);
-
-    __ cmp(eax, Operand(ecx));
-    __ j(not_equal, &fail);
-
-    __ bind(&loop_increment);
-    // Increment pointers into match and capture strings.
-    __ add(Operand(edx), Immediate(1));
-    __ add(Operand(edi), Immediate(1));
-    // Compare to end of match, and loop if not done.
-    __ cmp(edi, Operand(ebx));
-    __ j(below, &loop, taken);
-    __ jmp(&success);
-
-    __ bind(&fail);
-    // Restore original values before failing.
-    __ pop(backtrack_stackpointer());
-    __ pop(edi);
-    BranchOrBacktrack(no_condition, on_no_match);
-
-    __ bind(&success);
-    // Restore original value before continuing.
-    __ pop(backtrack_stackpointer());
-    // Drop original value of character position.
-    __ add(Operand(esp), Immediate(kPointerSize));
-    // Compute new value of character position after the matched part.
-    __ sub(edi, Operand(esi));
-  } else {
-    ASSERT(mode_ == UC16);
-    // Save registers before calling C function.
-    __ push(esi);
-    __ push(edi);
-    __ push(backtrack_stackpointer());
-    __ push(ebx);
-
-    const int argument_count = 3;
-    FrameAlign(argument_count, ecx);
-    // Put arguments into allocated stack area, last argument highest on stack.
-    // Parameters are
-    //   Address byte_offset1 - Address captured substring's start.
-    //   Address byte_offset2 - Address of current character position.
-    //   size_t byte_length - length of capture in bytes(!)
-
-    // Set byte_length.
-    __ mov(Operand(esp, 2 * kPointerSize), ebx);
-    // Set byte_offset2.
-    // Found by adding negative string-end offset of current position (edi)
-    // to end of string.
-    __ add(edi, Operand(esi));
-    __ mov(Operand(esp, 1 * kPointerSize), edi);
-    // Set byte_offset1.
-    // Start of capture, where edx already holds string-end negative offset.
-    __ add(edx, Operand(esi));
-    __ mov(Operand(esp, 0 * kPointerSize), edx);
-
-    Address function_address = FUNCTION_ADDR(&CaseInsensitiveCompareUC16);
-    CallCFunction(function_address, argument_count);
-    // Pop original values before reacting on result value.
-    __ pop(ebx);
-    __ pop(backtrack_stackpointer());
-    __ pop(edi);
-    __ pop(esi);
-
-    // Check if function returned non-zero for success or zero for failure.
-    __ or_(eax, Operand(eax));
-    BranchOrBacktrack(zero, on_no_match);
-    // On success, increment position by length of capture.
-    __ add(edi, Operand(ebx));
-  }
-  __ bind(&fallthrough);
-}
-
-
-void RegExpMacroAssemblerIA32::CheckNotBackReference(
-    int start_reg,
-    Label* on_no_match) {
-  Label fallthrough;
-  Label success;
-  Label fail;
-
-  // Find length of back-referenced capture.
-  __ mov(edx, register_location(start_reg));
-  __ mov(eax, register_location(start_reg + 1));
-  __ sub(eax, Operand(edx));  // Length to check.
-  // Fail on partial or illegal capture (start of capture after end of capture).
-  BranchOrBacktrack(less, on_no_match);
-  // Succeed on empty capture (including no capture)
-  __ j(equal, &fallthrough);
-
-  // Check that there are sufficient characters left in the input.
-  __ mov(ebx, edi);
-  __ add(ebx, Operand(eax));
-  BranchOrBacktrack(greater, on_no_match);
-
-  // Save register to make it available below.
-  __ push(backtrack_stackpointer());
-
-  // Compute pointers to match string and capture string
-  __ lea(ebx, Operand(esi, edi, times_1, 0));  // Start of match.
-  __ add(edx, Operand(esi));  // Start of capture.
-  __ lea(ecx, Operand(eax, ebx, times_1, 0));  // End of match
-
-  Label loop;
-  __ bind(&loop);
-  if (mode_ == ASCII) {
-    __ movzx_b(eax, Operand(edx, 0));
-    __ cmpb_al(Operand(ebx, 0));
-  } else {
-    ASSERT(mode_ == UC16);
-    __ movzx_w(eax, Operand(edx, 0));
-    __ cmpw_ax(Operand(ebx, 0));
-  }
-  __ j(not_equal, &fail);
-  // Increment pointers into capture and match string.
-  __ add(Operand(edx), Immediate(char_size()));
-  __ add(Operand(ebx), Immediate(char_size()));
-  // Check if we have reached end of match area.
-  __ cmp(ebx, Operand(ecx));
-  __ j(below, &loop);
-  __ jmp(&success);
-
-  __ bind(&fail);
-  // Restore backtrack stackpointer.
-  __ pop(backtrack_stackpointer());
-  BranchOrBacktrack(no_condition, on_no_match);
-
-  __ bind(&success);
-  // Move current character position to position after match.
-  __ mov(edi, ecx);
-  __ sub(Operand(edi), esi);
-  // Restore backtrack stackpointer.
-  __ pop(backtrack_stackpointer());
-
-  __ bind(&fallthrough);
-}
-
-
-void RegExpMacroAssemblerIA32::CheckNotRegistersEqual(int reg1,
-                                                      int reg2,
-                                                      Label* on_not_equal) {
-  __ mov(eax, register_location(reg1));
-  __ cmp(eax, register_location(reg2));
-  BranchOrBacktrack(not_equal, on_not_equal);
-}
-
-
-void RegExpMacroAssemblerIA32::CheckNotCharacter(uint32_t c,
-                                                 Label* on_not_equal) {
-  __ cmp(current_character(), c);
-  BranchOrBacktrack(not_equal, on_not_equal);
-}
-
-
-void RegExpMacroAssemblerIA32::CheckCharacterAfterAnd(uint32_t c,
-                                                      uint32_t mask,
-                                                      Label* on_equal) {
-  __ mov(eax, current_character());
-  __ and_(eax, mask);
-  __ cmp(eax, c);
-  BranchOrBacktrack(equal, on_equal);
-}
-
-
-void RegExpMacroAssemblerIA32::CheckNotCharacterAfterAnd(uint32_t c,
-                                                         uint32_t mask,
-                                                         Label* on_not_equal) {
-  __ mov(eax, current_character());
-  __ and_(eax, mask);
-  __ cmp(eax, c);
-  BranchOrBacktrack(not_equal, on_not_equal);
-}
-
-
-void RegExpMacroAssemblerIA32::CheckNotCharacterAfterMinusAnd(
-    uc16 c,
-    uc16 minus,
-    uc16 mask,
-    Label* on_not_equal) {
-  ASSERT(minus < String::kMaxUC16CharCode);
-  __ lea(eax, Operand(current_character(), -minus));
-  __ and_(eax, mask);
-  __ cmp(eax, c);
-  BranchOrBacktrack(not_equal, on_not_equal);
-}
-
-
-bool RegExpMacroAssemblerIA32::CheckSpecialCharacterClass(uc16 type,
-                                                          int cp_offset,
-                                                          bool check_offset,
-                                                          Label* on_no_match) {
-  // Range checks (c in min..max) are generally implemented by an unsigned
-  // (c - min) <= (max - min) check
-  switch (type) {
-  case 's':
-    // Match space-characters
-    if (mode_ == ASCII) {
-      // ASCII space characters are '\t'..'\r' and ' '.
-      if (check_offset) {
-        LoadCurrentCharacter(cp_offset, on_no_match);
-      } else {
-        LoadCurrentCharacterUnchecked(cp_offset, 1);
-      }
-      Label success;
-      __ cmp(current_character(), ' ');
-      __ j(equal, &success);
-      // Check range 0x09..0x0d
-      __ sub(Operand(current_character()), Immediate('\t'));
-      __ cmp(current_character(), '\r' - '\t');
-      BranchOrBacktrack(above, on_no_match);
-      __ bind(&success);
-      return true;
-    }
-    return false;
-  case 'S':
-    // Match non-space characters.
-    if (check_offset) {
-      LoadCurrentCharacter(cp_offset, on_no_match, 1);
-    } else {
-      LoadCurrentCharacterUnchecked(cp_offset, 1);
-    }
-    if (mode_ == ASCII) {
-      // ASCII space characters are '\t'..'\r' and ' '.
-      __ cmp(current_character(), ' ');
-      BranchOrBacktrack(equal, on_no_match);
-      __ sub(Operand(current_character()), Immediate('\t'));
-      __ cmp(current_character(), '\r' - '\t');
-      BranchOrBacktrack(below_equal, on_no_match);
-      return true;
-    }
-    return false;
-  case 'd':
-    // Match ASCII digits ('0'..'9')
-    if (check_offset) {
-      LoadCurrentCharacter(cp_offset, on_no_match, 1);
-    } else {
-      LoadCurrentCharacterUnchecked(cp_offset, 1);
-    }
-    __ sub(Operand(current_character()), Immediate('0'));
-    __ cmp(current_character(), '9' - '0');
-    BranchOrBacktrack(above, on_no_match);
-    return true;
-  case 'D':
-    // Match non ASCII-digits
-    if (check_offset) {
-      LoadCurrentCharacter(cp_offset, on_no_match, 1);
-    } else {
-      LoadCurrentCharacterUnchecked(cp_offset, 1);
-    }
-    __ sub(Operand(current_character()), Immediate('0'));
-    __ cmp(current_character(), '9' - '0');
-    BranchOrBacktrack(below_equal, on_no_match);
-    return true;
-  case '.': {
-    // Match non-newlines (not 0x0a('\n'), 0x0d('\r'), 0x2028 and 0x2029)
-    if (check_offset) {
-      LoadCurrentCharacter(cp_offset, on_no_match, 1);
-    } else {
-      LoadCurrentCharacterUnchecked(cp_offset, 1);
-    }
-    __ xor_(Operand(current_character()), Immediate(0x01));
-    // See if current character is '\n'^1 or '\r'^1, i.e., 0x0b or 0x0c
-    __ sub(Operand(current_character()), Immediate(0x0b));
-    __ cmp(current_character(), 0x0c - 0x0b);
-    BranchOrBacktrack(below_equal, on_no_match);
-    if (mode_ == UC16) {
-      // Compare original value to 0x2028 and 0x2029, using the already
-      // computed (current_char ^ 0x01 - 0x0b). I.e., check for
-      // 0x201d (0x2028 - 0x0b) or 0x201e.
-      __ sub(Operand(current_character()), Immediate(0x2028 - 0x0b));
-      __ cmp(current_character(), 1);
-      BranchOrBacktrack(below_equal, on_no_match);
-    }
-    return true;
-  }
-  case '*':
-    // Match any character.
-    if (check_offset) {
-      CheckPosition(cp_offset, on_no_match);
-    }
-    return true;
-  // No custom implementation (yet): w, W, s(UC16), S(UC16).
-  default:
-    return false;
-  }
-}
-
-void RegExpMacroAssemblerIA32::DispatchHalfNibbleMap(
-    uc16 start,
-    Label* half_nibble_map,
-    const Vector<Label*>& destinations) {
-  UNIMPLEMENTED();
-}
-
-
-void RegExpMacroAssemblerIA32::DispatchByteMap(
-    uc16 start,
-    Label* byte_map,
-    const Vector<Label*>& destinations) {
-  UNIMPLEMENTED();
-}
-
-
-void RegExpMacroAssemblerIA32::DispatchHighByteMap(
-    byte start,
-    Label* byte_map,
-    const Vector<Label*>& destinations) {
-  UNIMPLEMENTED();
-}
-
-
-void RegExpMacroAssemblerIA32::EmitOrLink(Label* label) {
-  UNIMPLEMENTED();  // Has no use.
-}
-
-
-void RegExpMacroAssemblerIA32::Fail() {
-  ASSERT(FAILURE == 0);  // Return value for failure is zero.
-  __ xor_(eax, Operand(eax));  // zero eax.
-  __ jmp(&exit_label_);
-}
-
-
-Handle<Object> RegExpMacroAssemblerIA32::GetCode(Handle<String> source) {
-  // Finalize code - write the entry point code now we know how many
-  // registers we need.
-
-  // Entry code:
-  __ bind(&entry_label_);
-  // Start new stack frame.
-  __ push(ebp);
-  __ mov(ebp, esp);
-  // Save callee-save registers. Order here should correspond to order of
-  // kBackup_ebx etc.
-  __ push(esi);
-  __ push(edi);
-  __ push(ebx);  // Callee-save on MacOS.
-  __ push(Immediate(0));  // Make room for "input start - 1" constant.
-
-  // Check if we have space on the stack for registers.
-  Label retry_stack_check;
-  Label stack_limit_hit;
-  Label stack_ok;
-
-  __ bind(&retry_stack_check);
-  ExternalReference stack_guard_limit =
-      ExternalReference::address_of_stack_guard_limit();
-  __ mov(ecx, esp);
-  __ sub(ecx, Operand::StaticVariable(stack_guard_limit));
-  // Handle it if the stack pointer is already below the stack limit.
-  __ j(below_equal, &stack_limit_hit, not_taken);
-  // Check if there is room for the variable number of registers above
-  // the stack limit.
-  __ cmp(ecx, num_registers_ * kPointerSize);
-  __ j(above_equal, &stack_ok, taken);
-  // Exit with OutOfMemory exception. There is not enough space on the stack
-  // for our working registers.
-  __ mov(eax, EXCEPTION);
-  __ jmp(&exit_label_);
-
-  __ bind(&stack_limit_hit);
-  CallCheckStackGuardState(ebx);
-  __ or_(eax, Operand(eax));
-  // If returned value is non-zero, we exit with the returned value as result.
-  // Otherwise it was a preemption and we just check the limit again.
-  __ j(equal, &retry_stack_check);
-  // Return value was non-zero. Exit with exception or retry.
-  __ jmp(&exit_label_);
-
-  __ bind(&stack_ok);
-
-  // Allocate space on stack for registers.
-  __ sub(Operand(esp), Immediate(num_registers_ * kPointerSize));
-  // Load string length.
-  __ mov(esi, Operand(ebp, kInputEnd));
-  // Load input position.
-  __ mov(edi, Operand(ebp, kInputStart));
-  // Set up edi to be negative offset from string end.
-  __ sub(edi, Operand(esi));
-  if (num_saved_registers_ > 0) {
-    // Fill saved registers with initial value = start offset - 1
-    // Fill in stack push order, to avoid accessing across an unwritten
-    // page (a problem on Windows).
-    __ mov(ecx, kRegisterZero);
-    // Set eax to address of char before start of input
-    // (effectively string position -1).
-    __ lea(eax, Operand(edi, -char_size()));
-    // Store this value in a local variable, for use when clearing
-    // position registers.
-    __ mov(Operand(ebp, kInputStartMinusOne), eax);
-    Label init_loop;
-    __ bind(&init_loop);
-    __ mov(Operand(ebp, ecx, times_1, +0), eax);
-    __ sub(Operand(ecx), Immediate(kPointerSize));
-    __ cmp(ecx, kRegisterZero - num_saved_registers_ * kPointerSize);
-    __ j(greater, &init_loop);
-  }
-  // Ensure that we have written to each stack page, in order. Skipping a page
-  // on Windows can cause segmentation faults. Assuming page size is 4k.
-  const int kPageSize = 4096;
-  const int kRegistersPerPage = kPageSize / kPointerSize;
-  for (int i = num_saved_registers_ + kRegistersPerPage - 1;
-      i < num_registers_;
-      i += kRegistersPerPage) {
-    __ mov(register_location(i), eax);  // One write every page.
-  }
-
-
-  // Initialize backtrack stack pointer.
-  __ mov(backtrack_stackpointer(), Operand(ebp, kStackHighEnd));
-  // Load previous char as initial value of current-character.
-  Label at_start;
-  __ cmp(Operand(ebp, kAtStart), Immediate(0));
-  __ j(not_equal, &at_start);
-  LoadCurrentCharacterUnchecked(-1, 1);  // Load previous char.
-  __ jmp(&start_label_);
-  __ bind(&at_start);
-  __ mov(current_character(), '\n');
-  __ jmp(&start_label_);
-
-
-  // Exit code:
-  if (success_label_.is_linked()) {
-    // Save captures when successful.
-    __ bind(&success_label_);
-    if (num_saved_registers_ > 0) {
-      // copy captures to output
-      __ mov(ebx, Operand(ebp, kRegisterOutput));
-      __ mov(ecx, Operand(ebp, kInputEnd));
-      __ sub(ecx, Operand(ebp, kInputStart));
-      for (int i = 0; i < num_saved_registers_; i++) {
-        __ mov(eax, register_location(i));
-        __ add(eax, Operand(ecx));  // Convert to index from start, not end.
-        if (mode_ == UC16) {
-          __ sar(eax, 1);  // Convert byte index to character index.
-        }
-        __ mov(Operand(ebx, i * kPointerSize), eax);
-      }
-    }
-    __ mov(eax, Immediate(SUCCESS));
-  }
-  // Exit and return eax
-  __ bind(&exit_label_);
-  // Skip esp past regexp registers.
-  __ lea(esp, Operand(ebp, kBackup_ebx));
-  // Restore callee-save registers.
-  __ pop(ebx);
-  __ pop(edi);
-  __ pop(esi);
-  // Exit function frame, restore previous one.
-  __ pop(ebp);
-  __ ret(0);
-
-  // Backtrack code (branch target for conditional backtracks).
-  if (backtrack_label_.is_linked()) {
-    __ bind(&backtrack_label_);
-    Backtrack();
-  }
-
-  Label exit_with_exception;
-
-  // Preempt-code
-  if (check_preempt_label_.is_linked()) {
-    __ bind(&check_preempt_label_);
-
-    __ push(backtrack_stackpointer());
-    __ push(edi);
-
-    Label retry;
-
-    __ bind(&retry);
-    CallCheckStackGuardState(ebx);
-    __ or_(eax, Operand(eax));
-    // If returning non-zero, we should end execution with the given
-    // result as return value.
-    __ j(not_zero, &exit_label_);
-    // Check if we are still preempted.
-    ExternalReference stack_guard_limit =
-        ExternalReference::address_of_stack_guard_limit();
-    __ cmp(esp, Operand::StaticVariable(stack_guard_limit));
-    __ j(below_equal, &retry);
-
-    __ pop(edi);
-    __ pop(backtrack_stackpointer());
-    // String might have moved: Reload esi from frame.
-    __ mov(esi, Operand(ebp, kInputEnd));
-    SafeReturn();
-  }
-
-  // Backtrack stack overflow code.
-  if (stack_overflow_label_.is_linked()) {
-    __ bind(&stack_overflow_label_);
-    // Reached if the backtrack-stack limit has been hit.
-
-    Label grow_failed;
-    // Save registers before calling C function
-    __ push(esi);
-    __ push(edi);
-
-    // Call GrowStack(backtrack_stackpointer())
-    int num_arguments = 2;
-    FrameAlign(num_arguments, ebx);
-    __ lea(eax, Operand(ebp, kStackHighEnd));
-    __ mov(Operand(esp, 1 * kPointerSize), eax);
-    __ mov(Operand(esp, 0 * kPointerSize), backtrack_stackpointer());
-    CallCFunction(FUNCTION_ADDR(&GrowStack), num_arguments);
-    // If return NULL, we have failed to grow the stack, and
-    // must exit with a stack-overflow exception.
-    __ or_(eax, Operand(eax));
-    __ j(equal, &exit_with_exception);
-    // Otherwise use return value as new stack pointer.
-    __ mov(backtrack_stackpointer(), eax);
-    // Restore saved registers and continue.
-    __ pop(edi);
-    __ pop(esi);
-    SafeReturn();
-  }
-
-  if (exit_with_exception.is_linked()) {
-    // If any of the code above needed to exit with an exception.
-    __ bind(&exit_with_exception);
-    // Exit with Result EXCEPTION(-1) to signal thrown exception.
-    __ mov(eax, EXCEPTION);
-    __ jmp(&exit_label_);
-  }
-
-  CodeDesc code_desc;
-  masm_->GetCode(&code_desc);
-  Handle<Code> code = Factory::NewCode(code_desc,
-                                       NULL,
-                                       Code::ComputeFlags(Code::REGEXP),
-                                       masm_->CodeObject());
-  LOG(RegExpCodeCreateEvent(*code, *source));
-  return Handle<Object>::cast(code);
-}
-
-
-void RegExpMacroAssemblerIA32::GoTo(Label* to) {
-  BranchOrBacktrack(no_condition, to);
-}
-
-
-void RegExpMacroAssemblerIA32::IfRegisterGE(int reg,
-                                            int comparand,
-                                            Label* if_ge) {
-  __ cmp(register_location(reg), Immediate(comparand));
-  BranchOrBacktrack(greater_equal, if_ge);
-}
-
-
-void RegExpMacroAssemblerIA32::IfRegisterLT(int reg,
-                                            int comparand,
-                                            Label* if_lt) {
-  __ cmp(register_location(reg), Immediate(comparand));
-  BranchOrBacktrack(less, if_lt);
-}
-
-
-void RegExpMacroAssemblerIA32::IfRegisterEqPos(int reg,
-                                               Label* if_eq) {
-  __ cmp(edi, register_location(reg));
-  BranchOrBacktrack(equal, if_eq);
-}
-
-
-RegExpMacroAssembler::IrregexpImplementation
-    RegExpMacroAssemblerIA32::Implementation() {
-  return kIA32Implementation;
-}
-
-
-void RegExpMacroAssemblerIA32::LoadCurrentCharacter(int cp_offset,
-                                                    Label* on_end_of_input,
-                                                    bool check_bounds,
-                                                    int characters) {
-  ASSERT(cp_offset >= -1);      // ^ and \b can look behind one character.
-  ASSERT(cp_offset < (1<<30));  // Be sane! (And ensure negation works)
-  CheckPosition(cp_offset + characters - 1, on_end_of_input);
-  LoadCurrentCharacterUnchecked(cp_offset, characters);
-}
-
-
-void RegExpMacroAssemblerIA32::PopCurrentPosition() {
-  Pop(edi);
-}
-
-
-void RegExpMacroAssemblerIA32::PopRegister(int register_index) {
-  Pop(eax);
-  __ mov(register_location(register_index), eax);
-}
-
-
-void RegExpMacroAssemblerIA32::PushBacktrack(Label* label) {
-  Push(Immediate::CodeRelativeOffset(label));
-  CheckStackLimit();
-}
-
-
-void RegExpMacroAssemblerIA32::PushCurrentPosition() {
-  Push(edi);
-}
-
-
-void RegExpMacroAssemblerIA32::PushRegister(int register_index,
-                                            StackCheckFlag check_stack_limit) {
-  __ mov(eax, register_location(register_index));
-  Push(eax);
-  if (check_stack_limit) CheckStackLimit();
-}
-
-
-void RegExpMacroAssemblerIA32::ReadCurrentPositionFromRegister(int reg) {
-  __ mov(edi, register_location(reg));
-}
-
-
-void RegExpMacroAssemblerIA32::ReadStackPointerFromRegister(int reg) {
-  __ mov(backtrack_stackpointer(), register_location(reg));
-  __ add(backtrack_stackpointer(), Operand(ebp, kStackHighEnd));
-}
-
-
-void RegExpMacroAssemblerIA32::SetRegister(int register_index, int to) {
-  ASSERT(register_index >= num_saved_registers_);  // Reserved for positions!
-  __ mov(register_location(register_index), Immediate(to));
-}
-
-
-void RegExpMacroAssemblerIA32::Succeed() {
-  __ jmp(&success_label_);
-}
-
-
-void RegExpMacroAssemblerIA32::WriteCurrentPositionToRegister(int reg,
-                                                              int cp_offset) {
-  if (cp_offset == 0) {
-    __ mov(register_location(reg), edi);
-  } else {
-    __ lea(eax, Operand(edi, cp_offset * char_size()));
-    __ mov(register_location(reg), eax);
-  }
-}
-
-
-void RegExpMacroAssemblerIA32::ClearRegisters(int reg_from, int reg_to) {
-  ASSERT(reg_from <= reg_to);
-  __ mov(eax, Operand(ebp, kInputStartMinusOne));
-  for (int reg = reg_from; reg <= reg_to; reg++) {
-    __ mov(register_location(reg), eax);
-  }
-}
-
-
-void RegExpMacroAssemblerIA32::WriteStackPointerToRegister(int reg) {
-  __ mov(eax, backtrack_stackpointer());
-  __ sub(eax, Operand(ebp, kStackHighEnd));
-  __ mov(register_location(reg), eax);
-}
-
-
-RegExpMacroAssemblerIA32::Result RegExpMacroAssemblerIA32::Match(
-    Handle<Code> regexp_code,
-    Handle<String> subject,
-    int* offsets_vector,
-    int offsets_vector_length,
-    int previous_index) {
-
-  ASSERT(subject->IsFlat());
-  ASSERT(previous_index >= 0);
-  ASSERT(previous_index <= subject->length());
-
-  // No allocations before calling the regexp, but we can't use
-  // AssertNoAllocation, since regexps might be preempted, and another thread
-  // might do allocation anyway.
-
-  String* subject_ptr = *subject;
-  // Character offsets into string.
-  int start_offset = previous_index;
-  int end_offset = subject_ptr->length();
-
-  bool is_ascii = StringShape(*subject).IsAsciiRepresentation();
-
-  if (StringShape(subject_ptr).IsCons()) {
-    subject_ptr = ConsString::cast(subject_ptr)->first();
-  } else if (StringShape(subject_ptr).IsSliced()) {
-    SlicedString* slice = SlicedString::cast(subject_ptr);
-    start_offset += slice->start();
-    end_offset += slice->start();
-    subject_ptr = slice->buffer();
-  }
-  // Ensure that an underlying string has the same ascii-ness.
-  ASSERT(StringShape(subject_ptr).IsAsciiRepresentation() == is_ascii);
-  ASSERT(subject_ptr->IsExternalString() || subject_ptr->IsSeqString());
-  // String is now either Sequential or External
-  int char_size_shift = is_ascii ? 0 : 1;
-  int char_length = end_offset - start_offset;
-
-  const byte* input_start =
-      StringCharacterPosition(subject_ptr, start_offset);
-  int byte_length = char_length << char_size_shift;
-  const byte* input_end = input_start + byte_length;
-  RegExpMacroAssemblerIA32::Result res = Execute(*regexp_code,
-                                                 subject_ptr,
-                                                 start_offset,
-                                                 input_start,
-                                                 input_end,
-                                                 offsets_vector,
-                                                 previous_index == 0);
-
-  if (res == SUCCESS) {
-    // Capture values are relative to start_offset only.
-    // Convert them to be relative to start of string.
-    for (int i = 0; i < offsets_vector_length; i++) {
-      if (offsets_vector[i] >= 0) {
-        offsets_vector[i] += previous_index;
-      }
-    }
-  }
-
-  return res;
-}
-
-// Private methods:
-
-static unibrow::Mapping<unibrow::Ecma262Canonicalize> canonicalize;
-
-RegExpMacroAssemblerIA32::Result RegExpMacroAssemblerIA32::Execute(
-    Code* code,
-    String* input,
-    int start_offset,
-    const byte* input_start,
-    const byte* input_end,
-    int* output,
-    bool at_start) {
-  typedef int (*matcher)(String*, int, const byte*,
-                         const byte*, int*, int, Address);
-  matcher matcher_func = FUNCTION_CAST<matcher>(code->entry());
-
-  int at_start_val = at_start ? 1 : 0;
-
-  // Ensure that the minimum stack has been allocated.
-  RegExpStack stack;
-  Address stack_top = RegExpStack::stack_top();
-
-  int result = matcher_func(input,
-                            start_offset,
-                            input_start,
-                            input_end,
-                            output,
-                            at_start_val,
-                            stack_top);
-  ASSERT(result <= SUCCESS);
-  ASSERT(result >= RETRY);
-
-  if (result == EXCEPTION && !Top::has_pending_exception()) {
-    // We detected a stack overflow (on the backtrack stack) in RegExp code,
-    // but haven't created the exception yet.
-    Top::StackOverflow();
-  }
-  return static_cast<Result>(result);
-}
-
-
-int RegExpMacroAssemblerIA32::CaseInsensitiveCompareUC16(Address byte_offset1,
-                                                         Address byte_offset2,
-                                                         size_t byte_length) {
-  // This function is not allowed to cause a garbage collection.
-  // A GC might move the calling generated code and invalidate the
-  // return address on the stack.
-  ASSERT(byte_length % 2 == 0);
-  uc16* substring1 = reinterpret_cast<uc16*>(byte_offset1);
-  uc16* substring2 = reinterpret_cast<uc16*>(byte_offset2);
-  size_t length = byte_length >> 1;
-
-  for (size_t i = 0; i < length; i++) {
-    unibrow::uchar c1 = substring1[i];
-    unibrow::uchar c2 = substring2[i];
-    if (c1 != c2) {
-      canonicalize.get(c1, '\0', &c1);
-      if (c1 != c2) {
-        canonicalize.get(c2, '\0', &c2);
-        if (c1 != c2) {
-          return 0;
-        }
-      }
-    }
-  }
-  return 1;
-}
-
-
-void RegExpMacroAssemblerIA32::CallCheckStackGuardState(Register scratch) {
-  int num_arguments = 3;
-  FrameAlign(num_arguments, scratch);
-  // RegExp code frame pointer.
-  __ mov(Operand(esp, 2 * kPointerSize), ebp);
-  // Code* of self.
-  __ mov(Operand(esp, 1 * kPointerSize), Immediate(masm_->CodeObject()));
-  // Next address on the stack (will be address of return address).
-  __ lea(eax, Operand(esp, -kPointerSize));
-  __ mov(Operand(esp, 0 * kPointerSize), eax);
-  CallCFunction(FUNCTION_ADDR(&CheckStackGuardState), num_arguments);
-}
-
-
-// Helper function for reading a value out of a stack frame.
-template <typename T>
-static T& frame_entry(Address re_frame, int frame_offset) {
-  return reinterpret_cast<T&>(Memory::int32_at(re_frame + frame_offset));
-}
-
-
-const byte* RegExpMacroAssemblerIA32::StringCharacterPosition(String* subject,
-                                                              int start_index) {
-  // Not just flat, but ultra flat.
-  ASSERT(subject->IsExternalString() || subject->IsSeqString());
-  ASSERT(start_index >= 0);
-  ASSERT(start_index <= subject->length());
-  if (StringShape(subject).IsAsciiRepresentation()) {
-    const byte* address;
-    if (StringShape(subject).IsExternal()) {
-      const char* data = ExternalAsciiString::cast(subject)->resource()->data();
-      address = reinterpret_cast<const byte*>(data);
-    } else {
-      ASSERT(subject->IsSeqAsciiString());
-      char* data = SeqAsciiString::cast(subject)->GetChars();
-      address = reinterpret_cast<const byte*>(data);
-    }
-    return address + start_index;
-  }
-  const uc16* data;
-  if (StringShape(subject).IsExternal()) {
-    data = ExternalTwoByteString::cast(subject)->resource()->data();
-  } else {
-    ASSERT(subject->IsSeqTwoByteString());
-    data = SeqTwoByteString::cast(subject)->GetChars();
-  }
-  return reinterpret_cast<const byte*>(data + start_index);
-}
-
-
-int RegExpMacroAssemblerIA32::CheckStackGuardState(Address* return_address,
-                                                   Code* re_code,
-                                                   Address re_frame) {
-  if (StackGuard::IsStackOverflow()) {
-    Top::StackOverflow();
-    return EXCEPTION;
-  }
-
-  // If not real stack overflow the stack guard was used to interrupt
-  // execution for another purpose.
-
-  // Prepare for possible GC.
-  HandleScope handles;
-  Handle<Code> code_handle(re_code);
-
-  Handle<String> subject(frame_entry<String*>(re_frame, kInputString));
-  // Current string.
-  bool is_ascii = StringShape(*subject).IsAsciiRepresentation();
-
-  ASSERT(re_code->instruction_start() <= *return_address);
-  ASSERT(*return_address <=
-      re_code->instruction_start() + re_code->instruction_size());
-
-  Object* result = Execution::HandleStackGuardInterrupt();
-
-  if (*code_handle != re_code) {  // Return address no longer valid
-    int delta = *code_handle - re_code;
-    // Overwrite the return address on the stack.
-    *return_address += delta;
-  }
-
-  if (result->IsException()) {
-    return EXCEPTION;
-  }
-
-  // String might have changed.
-  if (StringShape(*subject).IsAsciiRepresentation() != is_ascii) {
-    // If we changed between an ASCII and an UC16 string, the specialized
-    // code cannot be used, and we need to restart regexp matching from
-    // scratch (including, potentially, compiling a new version of the code).
-    return RETRY;
-  }
-
-  // Otherwise, the content of the string might have moved. It must still
-  // be a sequential or external string with the same content.
-  // Update the start and end pointers in the stack frame to the current
-  // location (whether it has actually moved or not).
-  ASSERT(StringShape(*subject).IsSequential() ||
-      StringShape(*subject).IsExternal());
-
-  // The original start address of the characters to match.
-  const byte* start_address = frame_entry<const byte*>(re_frame, kInputStart);
-
-  // Find the current start address of the same character at the current string
-  // position.
-  int start_index = frame_entry<int>(re_frame, kStartIndex);
-  const byte* new_address = StringCharacterPosition(*subject, start_index);
-
-  if (start_address != new_address) {
-    // If there is a difference, update start and end addresses in the
-    // RegExp stack frame to match the new value.
-    const byte* end_address = frame_entry<const byte* >(re_frame, kInputEnd);
-    int byte_length = end_address - start_address;
-    frame_entry<const byte*>(re_frame, kInputStart) = new_address;
-    frame_entry<const byte*>(re_frame, kInputEnd) = new_address + byte_length;
-  }
-
-  return 0;
-}
-
-
-Address RegExpMacroAssemblerIA32::GrowStack(Address stack_pointer,
-                                            Address* stack_top) {
-  size_t size = RegExpStack::stack_capacity();
-  Address old_stack_top = RegExpStack::stack_top();
-  ASSERT(old_stack_top == *stack_top);
-  ASSERT(stack_pointer <= old_stack_top);
-  ASSERT(static_cast<size_t>(old_stack_top - stack_pointer) <= size);
-  Address new_stack_top = RegExpStack::EnsureCapacity(size * 2);
-  if (new_stack_top == NULL) {
-    return NULL;
-  }
-  *stack_top = new_stack_top;
-  return new_stack_top - (old_stack_top - stack_pointer);
-}
-
-
-Operand RegExpMacroAssemblerIA32::register_location(int register_index) {
-  ASSERT(register_index < (1<<30));
-  if (num_registers_ <= register_index) {
-    num_registers_ = register_index + 1;
-  }
-  return Operand(ebp, kRegisterZero - register_index * kPointerSize);
-}
-
-
-void RegExpMacroAssemblerIA32::CheckPosition(int cp_offset,
-                                             Label* on_outside_input) {
-  __ cmp(edi, -cp_offset * char_size());
-  BranchOrBacktrack(greater_equal, on_outside_input);
-}
-
-
-void RegExpMacroAssemblerIA32::BranchOrBacktrack(Condition condition,
-                                                 Label* to,
-                                                 Hint hint) {
-  if (condition < 0) {  // No condition
-    if (to == NULL) {
-      Backtrack();
-      return;
-    }
-    __ jmp(to);
-    return;
-  }
-  if (to == NULL) {
-    __ j(condition, &backtrack_label_, hint);
-    return;
-  }
-  __ j(condition, to, hint);
-}
-
-
-void RegExpMacroAssemblerIA32::SafeCall(Label* to) {
-  Label return_to;
-  __ push(Immediate::CodeRelativeOffset(&return_to));
-  __ jmp(to);
-  __ bind(&return_to);
-}
-
-
-void RegExpMacroAssemblerIA32::SafeReturn() {
-  __ pop(ebx);
-  __ add(Operand(ebx), Immediate(masm_->CodeObject()));
-  __ jmp(Operand(ebx));
-}
-
-
-void RegExpMacroAssemblerIA32::Push(Register source) {
-  ASSERT(!source.is(backtrack_stackpointer()));
-  // Notice: This updates flags, unlike normal Push.
-  __ sub(Operand(backtrack_stackpointer()), Immediate(kPointerSize));
-  __ mov(Operand(backtrack_stackpointer(), 0), source);
-}
-
-
-void RegExpMacroAssemblerIA32::Push(Immediate value) {
-  // Notice: This updates flags, unlike normal Push.
-  __ sub(Operand(backtrack_stackpointer()), Immediate(kPointerSize));
-  __ mov(Operand(backtrack_stackpointer(), 0), value);
-}
-
-
-void RegExpMacroAssemblerIA32::Pop(Register target) {
-  ASSERT(!target.is(backtrack_stackpointer()));
-  __ mov(target, Operand(backtrack_stackpointer(), 0));
-  // Notice: This updates flags, unlike normal Pop.
-  __ add(Operand(backtrack_stackpointer()), Immediate(kPointerSize));
-}
-
-
-void RegExpMacroAssemblerIA32::CheckPreemption() {
-  // Check for preemption.
-  Label no_preempt;
-  ExternalReference stack_guard_limit =
-      ExternalReference::address_of_stack_guard_limit();
-  __ cmp(esp, Operand::StaticVariable(stack_guard_limit));
-  __ j(above, &no_preempt, taken);
-
-  SafeCall(&check_preempt_label_);
-
-  __ bind(&no_preempt);
-}
-
-
-void RegExpMacroAssemblerIA32::CheckStackLimit() {
-  if (FLAG_check_stack) {
-    Label no_stack_overflow;
-    ExternalReference stack_limit =
-        ExternalReference::address_of_regexp_stack_limit();
-    __ cmp(backtrack_stackpointer(), Operand::StaticVariable(stack_limit));
-    __ j(above, &no_stack_overflow);
-
-    SafeCall(&stack_overflow_label_);
-
-    __ bind(&no_stack_overflow);
-  }
-}
-
-
-void RegExpMacroAssemblerIA32::FrameAlign(int num_arguments, Register scratch) {
-  // TODO(lrn): Since we no longer use the system stack arbitrarily (but we do
-  // use it, e.g., for SafeCall), we know the number of elements on the stack
-  // since the last frame alignment. We might be able to do this simpler then.
-  int frameAlignment = OS::ActivationFrameAlignment();
-  if (frameAlignment != 0) {
-    // Make stack end at alignment and make room for num_arguments words
-    // and the original value of esp.
-    __ mov(scratch, esp);
-    __ sub(Operand(esp), Immediate((num_arguments + 1) * kPointerSize));
-    ASSERT(IsPowerOf2(frameAlignment));
-    __ and_(esp, -frameAlignment);
-    __ mov(Operand(esp, num_arguments * kPointerSize), scratch);
-  } else {
-    __ sub(Operand(esp), Immediate(num_arguments * kPointerSize));
-  }
-}
-
-
-void RegExpMacroAssemblerIA32::CallCFunction(Address function_address,
-                                             int num_arguments) {
-  __ mov(Operand(eax), Immediate(reinterpret_cast<int32_t>(function_address)));
-  __ call(Operand(eax));
-  if (OS::ActivationFrameAlignment() != 0) {
-    __ mov(esp, Operand(esp, num_arguments * kPointerSize));
-  } else {
-    __ add(Operand(esp), Immediate(num_arguments * sizeof(int32_t)));
-  }
-}
-
-
-void RegExpMacroAssemblerIA32::LoadCurrentCharacterUnchecked(int cp_offset,
-                                                             int characters) {
-  if (mode_ == ASCII) {
-    if (characters == 4) {
-      __ mov(current_character(), Operand(esi, edi, times_1, cp_offset));
-    } else if (characters == 2) {
-      __ movzx_w(current_character(), Operand(esi, edi, times_1, cp_offset));
-    } else {
-      ASSERT(characters == 1);
-      __ movzx_b(current_character(), Operand(esi, edi, times_1, cp_offset));
-    }
-  } else {
-    ASSERT(mode_ == UC16);
-    if (characters == 2) {
-      __ mov(current_character(),
-             Operand(esi, edi, times_1, cp_offset * sizeof(uc16)));
-    } else {
-      ASSERT(characters == 1);
-      __ movzx_w(current_character(),
-                 Operand(esi, edi, times_1, cp_offset * sizeof(uc16)));
-    }
-  }
-}
-
-
-void RegExpMacroAssemblerIA32::LoadConstantBufferAddress(Register reg,
-                                                         ArraySlice* buffer) {
-  __ mov(reg, buffer->array());
-  __ add(Operand(reg), Immediate(buffer->base_offset()));
-}
-
-#undef __
-}}  // namespace v8::internal