Move regexp implementation into its own folder.

src/ia32/regexp-macro-assembler-ia32.cc

Index: src/ia32/regexp-macro-assembler-ia32.cc
diff --git a/src/ia32/regexp-macro-assembler-ia32.cc b/src/ia32/regexp-macro-assembler-ia32.cc
deleted file mode 100644
index 36be56e46bcc71dcec68665bf2ba8621029704e1..0000000000000000000000000000000000000000
--- a/src/ia32/regexp-macro-assembler-ia32.cc
+++ /dev/null
@@ -1,1230 +0,0 @@
-// Copyright 2012 the V8 project authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "src/v8.h"
-
-#if V8_TARGET_ARCH_IA32
-
-#include "src/cpu-profiler.h"
-#include "src/log.h"
-#include "src/macro-assembler.h"
-#include "src/regexp-macro-assembler.h"
-#include "src/regexp-stack.h"
-#include "src/unicode.h"
-
-#include "src/ia32/regexp-macro-assembler-ia32.h"
-
-namespace v8 {
-namespace internal {
-
-#ifndef V8_INTERPRETED_REGEXP
-/*
- * This assembler uses the following register assignment convention
- * - edx : Current character.  Must be loaded using LoadCurrentCharacter
- *         before using any of the dispatch methods.  Temporarily stores the
- *         index of capture start after a matching pass for a global regexp.
- * - 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 and ebx are free to use for computations.
- *
- * Each call to a public method should retain this convention.
- * The stack will have the following structure:
- *       - Isolate* isolate     (address of the current isolate)
- *       - direct_call          (if 1, direct call from JavaScript code, if 0
- *                               call through the runtime system)
- *       - stack_area_base      (high end of the memory area to use as
- *                               backtracking stack)
- *       - capture array size   (may fit multiple sets of matches)
- *       - 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)
- *       - start index          (character index of start)
- *       - String* 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
- *       - success counter      (only for global regexps to count matches).
- *       - 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, by calling the code entry as cast to a function with the signature:
- * int (*match)(String* input_string,
- *              int start_index,
- *              Address start,
- *              Address end,
- *              int* capture_output_array,
- *              bool at_start,
- *              byte* stack_area_base,
- *              bool direct_call)
- */
-
-#define __ ACCESS_MASM(masm_)
-
-RegExpMacroAssemblerIA32::RegExpMacroAssemblerIA32(Isolate* isolate, Zone* zone,
-                                                   Mode mode,
-                                                   int registers_to_save)
-    : NativeRegExpMacroAssembler(isolate, zone),
-      masm_(new MacroAssembler(isolate, NULL, kRegExpCodeSize)),
-      mode_(mode),
-      num_registers_(registers_to_save),
-      num_saved_registers_(registers_to_save),
-      entry_label_(),
-      start_label_(),
-      success_label_(),
-      backtrack_label_(),
-      exit_label_() {
-  DCHECK_EQ(0, registers_to_save % 2);
-  __ 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) {
-    __ add(edi, Immediate(by * char_size()));
-  }
-}
-
-
-void RegExpMacroAssemblerIA32::AdvanceRegister(int reg, int by) {
-  DCHECK(reg >= 0);
-  DCHECK(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(ebx, Immediate(masm_->CodeObject()));
-  __ jmp(ebx);
-}
-
-
-void RegExpMacroAssemblerIA32::Bind(Label* label) {
-  __ bind(label);
-}
-
-
-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, kStartIndex), Immediate(0));
-  BranchOrBacktrack(not_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, kStartIndex), Immediate(0));
-  BranchOrBacktrack(not_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::CheckGreedyLoop(Label* on_equal) {
-  Label fallthrough;
-  __ cmp(edi, Operand(backtrack_stackpointer(), 0));
-  __ j(not_equal, &fallthrough);
-  __ add(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, 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);
-
-  // If length is zero, either the capture is empty or it is completely
-  // uncaptured. In either case succeed immediately.
-  __ j(equal, &fallthrough);
-
-  // Check that there are sufficient characters left in the input.
-  __ mov(eax, edi);
-  __ add(eax, ebx);
-  BranchOrBacktrack(greater, on_no_match);
-
-  if (mode_ == LATIN1) {
-    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, esi);  // Start of capture
-    __ add(edi, esi);  // Start of text to match against capture.
-    __ add(ebx, 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?
-    Label convert_capture;
-    __ j(below_equal, &convert_capture);  // In range 'a'-'z'.
-    // Latin-1: Check for values in range [224,254] but not 247.
-    __ sub(ecx, Immediate(224 - 'a'));
-    __ cmp(ecx, Immediate(254 - 224));
-    __ j(above, &fail);  // Weren't Latin-1 letters.
-    __ cmp(ecx, Immediate(247 - 224));  // Check for 247.
-    __ j(equal, &fail);
-    __ bind(&convert_capture);
-    // Also convert capture character.
-    __ movzx_b(ecx, Operand(edx, 0));
-    __ or_(ecx, 0x20);
-
-    __ cmp(eax, ecx);
-    __ j(not_equal, &fail);
-
-    __ bind(&loop_increment);
-    // Increment pointers into match and capture strings.
-    __ add(edx, Immediate(1));
-    __ add(edi, Immediate(1));
-    // Compare to end of match, and loop if not done.
-    __ cmp(edi, ebx);
-    __ j(below, &loop);
-    __ 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(esp, Immediate(kPointerSize));
-    // Compute new value of character position after the matched part.
-    __ sub(edi, esi);
-  } else {
-    DCHECK(mode_ == UC16);
-    // Save registers before calling C function.
-    __ push(esi);
-    __ push(edi);
-    __ push(backtrack_stackpointer());
-    __ push(ebx);
-
-    static const int argument_count = 4;
-    __ PrepareCallCFunction(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(!)
-    //   Isolate* isolate
-
-    // Set isolate.
-    __ mov(Operand(esp, 3 * kPointerSize),
-           Immediate(ExternalReference::isolate_address(isolate())));
-    // 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, esi);
-    __ mov(Operand(esp, 1 * kPointerSize), edi);
-    // Set byte_offset1.
-    // Start of capture, where edx already holds string-end negative offset.
-    __ add(edx, esi);
-    __ mov(Operand(esp, 0 * kPointerSize), edx);
-
-    {
-      AllowExternalCallThatCantCauseGC scope(masm_);
-      ExternalReference compare =
-          ExternalReference::re_case_insensitive_compare_uc16(isolate());
-      __ CallCFunction(compare, 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, eax);
-    BranchOrBacktrack(zero, on_no_match);
-    // On success, increment position by length of capture.
-    __ add(edi, 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, 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, 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, esi);  // Start of capture.
-  __ lea(ecx, Operand(eax, ebx, times_1, 0));  // End of match
-
-  Label loop;
-  __ bind(&loop);
-  if (mode_ == LATIN1) {
-    __ movzx_b(eax, Operand(edx, 0));
-    __ cmpb_al(Operand(ebx, 0));
-  } else {
-    DCHECK(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(edx, Immediate(char_size()));
-  __ add(ebx, Immediate(char_size()));
-  // Check if we have reached end of match area.
-  __ cmp(ebx, 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(edi, esi);
-  // Restore backtrack stackpointer.
-  __ pop(backtrack_stackpointer());
-
-  __ bind(&fallthrough);
-}
-
-
-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) {
-  if (c == 0) {
-    __ test(current_character(), Immediate(mask));
-  } else {
-    __ mov(eax, mask);
-    __ and_(eax, current_character());
-    __ cmp(eax, c);
-  }
-  BranchOrBacktrack(equal, on_equal);
-}
-
-
-void RegExpMacroAssemblerIA32::CheckNotCharacterAfterAnd(uint32_t c,
-                                                         uint32_t mask,
-                                                         Label* on_not_equal) {
-  if (c == 0) {
-    __ test(current_character(), Immediate(mask));
-  } else {
-    __ mov(eax, mask);
-    __ and_(eax, current_character());
-    __ cmp(eax, c);
-  }
-  BranchOrBacktrack(not_equal, on_not_equal);
-}
-
-
-void RegExpMacroAssemblerIA32::CheckNotCharacterAfterMinusAnd(
-    uc16 c,
-    uc16 minus,
-    uc16 mask,
-    Label* on_not_equal) {
-  DCHECK(minus < String::kMaxUtf16CodeUnit);
-  __ lea(eax, Operand(current_character(), -minus));
-  if (c == 0) {
-    __ test(eax, Immediate(mask));
-  } else {
-    __ and_(eax, mask);
-    __ cmp(eax, c);
-  }
-  BranchOrBacktrack(not_equal, on_not_equal);
-}
-
-
-void RegExpMacroAssemblerIA32::CheckCharacterInRange(
-    uc16 from,
-    uc16 to,
-    Label* on_in_range) {
-  __ lea(eax, Operand(current_character(), -from));
-  __ cmp(eax, to - from);
-  BranchOrBacktrack(below_equal, on_in_range);
-}
-
-
-void RegExpMacroAssemblerIA32::CheckCharacterNotInRange(
-    uc16 from,
-    uc16 to,
-    Label* on_not_in_range) {
-  __ lea(eax, Operand(current_character(), -from));
-  __ cmp(eax, to - from);
-  BranchOrBacktrack(above, on_not_in_range);
-}
-
-
-void RegExpMacroAssemblerIA32::CheckBitInTable(
-    Handle<ByteArray> table,
-    Label* on_bit_set) {
-  __ mov(eax, Immediate(table));
-  Register index = current_character();
-  if (mode_ != LATIN1 || kTableMask != String::kMaxOneByteCharCode) {
-    __ mov(ebx, kTableSize - 1);
-    __ and_(ebx, current_character());
-    index = ebx;
-  }
-  __ cmpb(FieldOperand(eax, index, times_1, ByteArray::kHeaderSize), 0);
-  BranchOrBacktrack(not_equal, on_bit_set);
-}
-
-
-bool RegExpMacroAssemblerIA32::CheckSpecialCharacterClass(uc16 type,
-                                                          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_ == LATIN1) {
-      // One byte space characters are '\t'..'\r', ' ' and \u00a0.
-      Label success;
-      __ cmp(current_character(), ' ');
-      __ j(equal, &success, Label::kNear);
-      // Check range 0x09..0x0d
-      __ lea(eax, Operand(current_character(), -'\t'));
-      __ cmp(eax, '\r' - '\t');
-      __ j(below_equal, &success, Label::kNear);
-      // \u00a0 (NBSP).
-      __ cmp(eax, 0x00a0 - '\t');
-      BranchOrBacktrack(not_equal, on_no_match);
-      __ bind(&success);
-      return true;
-    }
-    return false;
-  case 'S':
-    // The emitted code for generic character classes is good enough.
-    return false;
-  case 'd':
-    // Match ASCII digits ('0'..'9')
-    __ lea(eax, Operand(current_character(), -'0'));
-    __ cmp(eax, '9' - '0');
-    BranchOrBacktrack(above, on_no_match);
-    return true;
-  case 'D':
-    // Match non ASCII-digits
-    __ lea(eax, Operand(current_character(), -'0'));
-    __ cmp(eax, '9' - '0');
-    BranchOrBacktrack(below_equal, on_no_match);
-    return true;
-  case '.': {
-    // Match non-newlines (not 0x0a('\n'), 0x0d('\r'), 0x2028 and 0x2029)
-    __ mov(eax, current_character());
-    __ xor_(eax, Immediate(0x01));
-    // See if current character is '\n'^1 or '\r'^1, i.e., 0x0b or 0x0c
-    __ sub(eax, Immediate(0x0b));
-    __ cmp(eax, 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(eax, Immediate(0x2028 - 0x0b));
-      __ cmp(eax, 0x2029 - 0x2028);
-      BranchOrBacktrack(below_equal, on_no_match);
-    }
-    return true;
-  }
-  case 'w': {
-    if (mode_ != LATIN1) {
-      // Table is 256 entries, so all Latin1 characters can be tested.
-      __ cmp(current_character(), Immediate('z'));
-      BranchOrBacktrack(above, on_no_match);
-    }
-    DCHECK_EQ(0, word_character_map[0]);  // Character '\0' is not a word char.
-    ExternalReference word_map = ExternalReference::re_word_character_map();
-    __ test_b(current_character(),
-              Operand::StaticArray(current_character(), times_1, word_map));
-    BranchOrBacktrack(zero, on_no_match);
-    return true;
-  }
-  case 'W': {
-    Label done;
-    if (mode_ != LATIN1) {
-      // Table is 256 entries, so all Latin1 characters can be tested.
-      __ cmp(current_character(), Immediate('z'));
-      __ j(above, &done);
-    }
-    DCHECK_EQ(0, word_character_map[0]);  // Character '\0' is not a word char.
-    ExternalReference word_map = ExternalReference::re_word_character_map();
-    __ test_b(current_character(),
-              Operand::StaticArray(current_character(), times_1, word_map));
-    BranchOrBacktrack(not_zero, on_no_match);
-    if (mode_ != LATIN1) {
-      __ bind(&done);
-    }
-    return true;
-  }
-  // Non-standard classes (with no syntactic shorthand) used internally.
-  case '*':
-    // Match any character.
-    return true;
-  case 'n': {
-    // Match newlines (0x0a('\n'), 0x0d('\r'), 0x2028 or 0x2029).
-    // The opposite of '.'.
-    __ mov(eax, current_character());
-    __ xor_(eax, Immediate(0x01));
-    // See if current character is '\n'^1 or '\r'^1, i.e., 0x0b or 0x0c
-    __ sub(eax, Immediate(0x0b));
-    __ cmp(eax, 0x0c - 0x0b);
-    if (mode_ == LATIN1) {
-      BranchOrBacktrack(above, on_no_match);
-    } else {
-      Label done;
-      BranchOrBacktrack(below_equal, &done);
-      DCHECK_EQ(UC16, mode_);
-      // 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(eax, Immediate(0x2028 - 0x0b));
-      __ cmp(eax, 1);
-      BranchOrBacktrack(above, on_no_match);
-      __ bind(&done);
-    }
-    return true;
-  }
-  // No custom implementation (yet): s(UC16), S(UC16).
-  default:
-    return false;
-  }
-}
-
-
-void RegExpMacroAssemblerIA32::Fail() {
-  STATIC_ASSERT(FAILURE == 0);  // Return value for failure is zero.
-  if (!global()) {
-    __ Move(eax, Immediate(FAILURE));
-  }
-  __ jmp(&exit_label_);
-}
-
-
-Handle<HeapObject> RegExpMacroAssemblerIA32::GetCode(Handle<String> source) {
-  Label return_eax;
-  // Finalize code - write the entry point code now we know how many
-  // registers we need.
-
-  // Entry code:
-  __ bind(&entry_label_);
-
-  // Tell the system that we have a stack frame.  Because the type is MANUAL, no
-  // code is generated.
-  FrameScope scope(masm_, StackFrame::MANUAL);
-
-  // Actually emit code to start a 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));  // Number of successful matches in a global regexp.
-  __ push(Immediate(0));  // Make room for "input start - 1" constant.
-
-  // Check if we have space on the stack for registers.
-  Label stack_limit_hit;
-  Label stack_ok;
-
-  ExternalReference stack_limit =
-      ExternalReference::address_of_stack_limit(isolate());
-  __ mov(ecx, esp);
-  __ sub(ecx, Operand::StaticVariable(stack_limit));
-  // Handle it if the stack pointer is already below the stack limit.
-  __ j(below_equal, &stack_limit_hit);
-  // 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);
-  // Exit with OutOfMemory exception. There is not enough space on the stack
-  // for our working registers.
-  __ mov(eax, EXCEPTION);
-  __ jmp(&return_eax);
-
-  __ bind(&stack_limit_hit);
-  CallCheckStackGuardState(ebx);
-  __ or_(eax, eax);
-  // If returned value is non-zero, we exit with the returned value as result.
-  __ j(not_zero, &return_eax);
-
-  __ bind(&stack_ok);
-  // Load start index for later use.
-  __ mov(ebx, Operand(ebp, kStartIndex));
-
-  // Allocate space on stack for registers.
-  __ sub(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, esi);
-
-  // Set eax to address of char before start of the string.
-  // (effectively string position -1).
-  __ neg(ebx);
-  if (mode_ == UC16) {
-    __ lea(eax, Operand(edi, ebx, times_2, -char_size()));
-  } else {
-    __ lea(eax, Operand(edi, ebx, times_1, -char_size()));
-  }
-  // Store this value in a local variable, for use when clearing
-  // position registers.
-  __ mov(Operand(ebp, kInputStartMinusOne), eax);
-
-#if V8_OS_WIN
-  // Ensure that we write 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.
-  }
-#endif  // V8_OS_WIN
-
-  Label load_char_start_regexp, start_regexp;
-  // Load newline if index is at start, previous character otherwise.
-  __ cmp(Operand(ebp, kStartIndex), Immediate(0));
-  __ j(not_equal, &load_char_start_regexp, Label::kNear);
-  __ mov(current_character(), '\n');
-  __ jmp(&start_regexp, Label::kNear);
-
-  // Global regexp restarts matching here.
-  __ bind(&load_char_start_regexp);
-  // Load previous char as initial value of current character register.
-  LoadCurrentCharacterUnchecked(-1, 1);
-  __ bind(&start_regexp);
-
-  // Initialize on-stack registers.
-  if (num_saved_registers_ > 0) {  // Always is, if generated from a regexp.
-    // 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).
-    if (num_saved_registers_ > 8) {
-      __ mov(ecx, kRegisterZero);
-      Label init_loop;
-      __ bind(&init_loop);
-      __ mov(Operand(ebp, ecx, times_1, 0), eax);
-      __ sub(ecx, Immediate(kPointerSize));
-      __ cmp(ecx, kRegisterZero - num_saved_registers_ * kPointerSize);
-      __ j(greater, &init_loop);
-    } else {  // Unroll the loop.
-      for (int i = 0; i < num_saved_registers_; i++) {
-        __ mov(register_location(i), eax);
-      }
-    }
-  }
-
-  // Initialize backtrack stack pointer.
-  __ mov(backtrack_stackpointer(), Operand(ebp, kStackHighEnd));
-
-  __ 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));
-      __ mov(edx, Operand(ebp, kStartIndex));
-      __ sub(ecx, Operand(ebp, kInputStart));
-      if (mode_ == UC16) {
-        __ lea(ecx, Operand(ecx, edx, times_2, 0));
-      } else {
-        __ add(ecx, edx);
-      }
-      for (int i = 0; i < num_saved_registers_; i++) {
-        __ mov(eax, register_location(i));
-        if (i == 0 && global_with_zero_length_check()) {
-          // Keep capture start in edx for the zero-length check later.
-          __ mov(edx, eax);
-        }
-        // Convert to index from start of string, not end.
-        __ add(eax, ecx);
-        if (mode_ == UC16) {
-          __ sar(eax, 1);  // Convert byte index to character index.
-        }
-        __ mov(Operand(ebx, i * kPointerSize), eax);
-      }
-    }
-
-    if (global()) {
-    // Restart matching if the regular expression is flagged as global.
-      // Increment success counter.
-      __ inc(Operand(ebp, kSuccessfulCaptures));
-      // Capture results have been stored, so the number of remaining global
-      // output registers is reduced by the number of stored captures.
-      __ mov(ecx, Operand(ebp, kNumOutputRegisters));
-      __ sub(ecx, Immediate(num_saved_registers_));
-      // Check whether we have enough room for another set of capture results.
-      __ cmp(ecx, Immediate(num_saved_registers_));
-      __ j(less, &exit_label_);
-
-      __ mov(Operand(ebp, kNumOutputRegisters), ecx);
-      // Advance the location for output.
-      __ add(Operand(ebp, kRegisterOutput),
-             Immediate(num_saved_registers_ * kPointerSize));
-
-      // Prepare eax to initialize registers with its value in the next run.
-      __ mov(eax, Operand(ebp, kInputStartMinusOne));
-
-      if (global_with_zero_length_check()) {
-        // Special case for zero-length matches.
-        // edx: capture start index
-        __ cmp(edi, edx);
-        // Not a zero-length match, restart.
-        __ j(not_equal, &load_char_start_regexp);
-        // edi (offset from the end) is zero if we already reached the end.
-        __ test(edi, edi);
-        __ j(zero, &exit_label_, Label::kNear);
-        // Advance current position after a zero-length match.
-        if (mode_ == UC16) {
-          __ add(edi, Immediate(2));
-        } else {
-          __ inc(edi);
-        }
-      }
-
-      __ jmp(&load_char_start_regexp);
-    } else {
-      __ mov(eax, Immediate(SUCCESS));
-    }
-  }
-
-  __ bind(&exit_label_);
-  if (global()) {
-    // Return the number of successful captures.
-    __ mov(eax, Operand(ebp, kSuccessfulCaptures));
-  }
-
-  __ bind(&return_eax);
-  // 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()) {
-    SafeCallTarget(&check_preempt_label_);
-
-    __ push(backtrack_stackpointer());
-    __ push(edi);
-
-    CallCheckStackGuardState(ebx);
-    __ or_(eax, eax);
-    // If returning non-zero, we should end execution with the given
-    // result as return value.
-    __ j(not_zero, &return_eax);
-
-    __ 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()) {
-    SafeCallTarget(&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())
-    static const int num_arguments = 3;
-    __ PrepareCallCFunction(num_arguments, ebx);
-    __ mov(Operand(esp, 2 * kPointerSize),
-           Immediate(ExternalReference::isolate_address(isolate())));
-    __ lea(eax, Operand(ebp, kStackHighEnd));
-    __ mov(Operand(esp, 1 * kPointerSize), eax);
-    __ mov(Operand(esp, 0 * kPointerSize), backtrack_stackpointer());
-    ExternalReference grow_stack =
-        ExternalReference::re_grow_stack(isolate());
-    __ CallCFunction(grow_stack, num_arguments);
-    // If return NULL, we have failed to grow the stack, and
-    // must exit with a stack-overflow exception.
-    __ or_(eax, 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(&return_eax);
-  }
-
-  CodeDesc code_desc;
-  masm_->GetCode(&code_desc);
-  Handle<Code> code =
-      isolate()->factory()->NewCode(code_desc,
-                                    Code::ComputeFlags(Code::REGEXP),
-                                    masm_->CodeObject());
-  PROFILE(isolate(), RegExpCodeCreateEvent(*code, *source));
-  return Handle<HeapObject>::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) {
-  DCHECK(cp_offset >= -1);      // ^ and \b can look behind one character.
-  DCHECK(cp_offset < (1<<30));  // Be sane! (And ensure negation works)
-  if (check_bounds) {
-    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::SetCurrentPositionFromEnd(int by)  {
-  Label after_position;
-  __ cmp(edi, -by * char_size());
-  __ j(greater_equal, &after_position, Label::kNear);
-  __ mov(edi, -by * char_size());
-  // On RegExp code entry (where this operation is used), the character before
-  // the current position is expected to be already loaded.
-  // We have advanced the position, so it's safe to read backwards.
-  LoadCurrentCharacterUnchecked(-1, 1);
-  __ bind(&after_position);
-}
-
-
-void RegExpMacroAssemblerIA32::SetRegister(int register_index, int to) {
-  DCHECK(register_index >= num_saved_registers_);  // Reserved for positions!
-  __ mov(register_location(register_index), Immediate(to));
-}
-
-
-bool RegExpMacroAssemblerIA32::Succeed() {
-  __ jmp(&success_label_);
-  return global();
-}
-
-
-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) {
-  DCHECK(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);
-}
-
-
-// Private methods:
-
-void RegExpMacroAssemblerIA32::CallCheckStackGuardState(Register scratch) {
-  static const int num_arguments = 3;
-  __ PrepareCallCFunction(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);
-  ExternalReference check_stack_guard =
-      ExternalReference::re_check_stack_guard_state(isolate());
-  __ CallCFunction(check_stack_guard, 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));
-}
-
-
-template <typename T>
-static T* frame_entry_address(Address re_frame, int frame_offset) {
-  return reinterpret_cast<T*>(re_frame + frame_offset);
-}
-
-
-int RegExpMacroAssemblerIA32::CheckStackGuardState(Address* return_address,
-                                                   Code* re_code,
-                                                   Address re_frame) {
-  return NativeRegExpMacroAssembler::CheckStackGuardState(
-      frame_entry<Isolate*>(re_frame, kIsolate),
-      frame_entry<int>(re_frame, kStartIndex),
-      frame_entry<int>(re_frame, kDirectCall) == 1, return_address, re_code,
-      frame_entry_address<String*>(re_frame, kInputString),
-      frame_entry_address<const byte*>(re_frame, kInputStart),
-      frame_entry_address<const byte*>(re_frame, kInputEnd));
-}
-
-
-Operand RegExpMacroAssemblerIA32::register_location(int register_index) {
-  DCHECK(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) {
-  if (condition < 0) {  // No condition
-    if (to == NULL) {
-      Backtrack();
-      return;
-    }
-    __ jmp(to);
-    return;
-  }
-  if (to == NULL) {
-    __ j(condition, &backtrack_label_);
-    return;
-  }
-  __ j(condition, to);
-}
-
-
-void RegExpMacroAssemblerIA32::SafeCall(Label* to) {
-  Label return_to;
-  __ push(Immediate::CodeRelativeOffset(&return_to));
-  __ jmp(to);
-  __ bind(&return_to);
-}
-
-
-void RegExpMacroAssemblerIA32::SafeReturn() {
-  __ pop(ebx);
-  __ add(ebx, Immediate(masm_->CodeObject()));
-  __ jmp(ebx);
-}
-
-
-void RegExpMacroAssemblerIA32::SafeCallTarget(Label* name) {
-  __ bind(name);
-}
-
-
-void RegExpMacroAssemblerIA32::Push(Register source) {
-  DCHECK(!source.is(backtrack_stackpointer()));
-  // Notice: This updates flags, unlike normal Push.
-  __ sub(backtrack_stackpointer(), Immediate(kPointerSize));
-  __ mov(Operand(backtrack_stackpointer(), 0), source);
-}
-
-
-void RegExpMacroAssemblerIA32::Push(Immediate value) {
-  // Notice: This updates flags, unlike normal Push.
-  __ sub(backtrack_stackpointer(), Immediate(kPointerSize));
-  __ mov(Operand(backtrack_stackpointer(), 0), value);
-}
-
-
-void RegExpMacroAssemblerIA32::Pop(Register target) {
-  DCHECK(!target.is(backtrack_stackpointer()));
-  __ mov(target, Operand(backtrack_stackpointer(), 0));
-  // Notice: This updates flags, unlike normal Pop.
-  __ add(backtrack_stackpointer(), Immediate(kPointerSize));
-}
-
-
-void RegExpMacroAssemblerIA32::CheckPreemption() {
-  // Check for preemption.
-  Label no_preempt;
-  ExternalReference stack_limit =
-      ExternalReference::address_of_stack_limit(isolate());
-  __ cmp(esp, Operand::StaticVariable(stack_limit));
-  __ j(above, &no_preempt);
-
-  SafeCall(&check_preempt_label_);
-
-  __ bind(&no_preempt);
-}
-
-
-void RegExpMacroAssemblerIA32::CheckStackLimit() {
-  Label no_stack_overflow;
-  ExternalReference stack_limit =
-      ExternalReference::address_of_regexp_stack_limit(isolate());
-  __ cmp(backtrack_stackpointer(), Operand::StaticVariable(stack_limit));
-  __ j(above, &no_stack_overflow);
-
-  SafeCall(&stack_overflow_label_);
-
-  __ bind(&no_stack_overflow);
-}
-
-
-void RegExpMacroAssemblerIA32::LoadCurrentCharacterUnchecked(int cp_offset,
-                                                             int characters) {
-  if (mode_ == LATIN1) {
-    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 {
-      DCHECK(characters == 1);
-      __ movzx_b(current_character(), Operand(esi, edi, times_1, cp_offset));
-    }
-  } else {
-    DCHECK(mode_ == UC16);
-    if (characters == 2) {
-      __ mov(current_character(),
-             Operand(esi, edi, times_1, cp_offset * sizeof(uc16)));
-    } else {
-      DCHECK(characters == 1);
-      __ movzx_w(current_character(),
-                 Operand(esi, edi, times_1, cp_offset * sizeof(uc16)));
-    }
-  }
-}
-
-
-#undef __
-
-#endif  // V8_INTERPRETED_REGEXP
-
-}  // namespace internal
-}  // namespace v8
-
-#endif  // V8_TARGET_ARCH_IA32