Move regexp implementation into its own folder.

src/x64/regexp-macro-assembler-x64.cc

Index: src/x64/regexp-macro-assembler-x64.cc
diff --git a/src/x64/regexp-macro-assembler-x64.cc b/src/x64/regexp-macro-assembler-x64.cc
deleted file mode 100644
index f1eb07207576d3721aae3b54c8f0dfa0a56c7d31..0000000000000000000000000000000000000000
--- a/src/x64/regexp-macro-assembler-x64.cc
+++ /dev/null
@@ -1,1362 +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_X64
-
-#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/x64/regexp-macro-assembler-x64.h"
-
-namespace v8 {
-namespace internal {
-
-#ifndef V8_INTERPRETED_REGEXP
-
-/*
- * This assembler uses the following register assignment convention
- * - rdx : Currently loaded character(s) as Latin1 or UC16.  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.
- * - rdi : Current position in input, as negative offset from end of string.
- *         Please notice that this is the byte offset, not the character
- *         offset!  Is always a 32-bit signed (negative) offset, but must be
- *         maintained sign-extended to 64 bits, since it is used as index.
- * - rsi : End of input (points to byte after last character in input),
- *         so that rsi+rdi points to the current character.
- * - rbp : Frame pointer.  Used to access arguments, local variables and
- *         RegExp registers.
- * - rsp : Points to tip of C stack.
- * - rcx : Points to tip of backtrack stack.  The backtrack stack contains
- *         only 32-bit values.  Most are offsets from some base (e.g., character
- *         positions from end of string or code location from Code* pointer).
- * - r8  : Code object pointer.  Used to convert between absolute and
- *         code-object-relative addresses.
- *
- * The registers rax, rbx, r9 and r11 are free to use for computations.
- * If changed to use r12+, they should be saved as callee-save registers.
- * The macro assembler special register r13 (kRootRegister) isn't special
- * during execution of RegExp code (it doesn't hold the value assumed when
- * creating JS code), so Root related macro operations can be used.
- *
- * Each call to a C++ method should retain these registers.
- *
- * The stack will have the following content, in some order, indexable from the
- * frame pointer (see, e.g., kStackHighEnd):
- *    - 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 (input string)
- *    - return address
- *    - backup of callee save registers (rbx, possibly rsi and rdi).
- *    - success counter      (only useful for global regexp to count matches)
- *    - Offset of location before start of input (effectively character
- *      position -1).  Used to initialize capture registers to a non-position.
- *    - At start of string (if 1, we are starting at the start of the
- *      string, otherwise 0)
- *    - register 0  rbp[-n]   (Only positions must be stored in the first
- *    - register 1  rbp[-n-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 uninitialized.
- *
- * The first seven values must be provided by the calling code by
- * calling the code's entry address cast to a function pointer with the
- * following 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_))
-
-RegExpMacroAssemblerX64::RegExpMacroAssemblerX64(Isolate* isolate, Zone* zone,
-                                                 Mode mode,
-                                                 int registers_to_save)
-    : NativeRegExpMacroAssembler(isolate, zone),
-      masm_(isolate, NULL, kRegExpCodeSize),
-      no_root_array_scope_(&masm_),
-      code_relative_fixup_positions_(4, zone),
-      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 when we know more.
-  __ bind(&start_label_);  // And then continue from here.
-}
-
-
-RegExpMacroAssemblerX64::~RegExpMacroAssemblerX64() {
-  // 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 RegExpMacroAssemblerX64::stack_limit_slack()  {
-  return RegExpStack::kStackLimitSlack;
-}
-
-
-void RegExpMacroAssemblerX64::AdvanceCurrentPosition(int by) {
-  if (by != 0) {
-    __ addq(rdi, Immediate(by * char_size()));
-  }
-}
-
-
-void RegExpMacroAssemblerX64::AdvanceRegister(int reg, int by) {
-  DCHECK(reg >= 0);
-  DCHECK(reg < num_registers_);
-  if (by != 0) {
-    __ addp(register_location(reg), Immediate(by));
-  }
-}
-
-
-void RegExpMacroAssemblerX64::Backtrack() {
-  CheckPreemption();
-  // Pop Code* offset from backtrack stack, add Code* and jump to location.
-  Pop(rbx);
-  __ addp(rbx, code_object_pointer());
-  __ jmp(rbx);
-}
-
-
-void RegExpMacroAssemblerX64::Bind(Label* label) {
-  __ bind(label);
-}
-
-
-void RegExpMacroAssemblerX64::CheckCharacter(uint32_t c, Label* on_equal) {
-  __ cmpl(current_character(), Immediate(c));
-  BranchOrBacktrack(equal, on_equal);
-}
-
-
-void RegExpMacroAssemblerX64::CheckCharacterGT(uc16 limit, Label* on_greater) {
-  __ cmpl(current_character(), Immediate(limit));
-  BranchOrBacktrack(greater, on_greater);
-}
-
-
-void RegExpMacroAssemblerX64::CheckAtStart(Label* on_at_start) {
-  Label not_at_start;
-  // Did we start the match at the start of the string at all?
-  __ cmpl(Operand(rbp, kStartIndex), Immediate(0));
-  BranchOrBacktrack(not_equal, &not_at_start);
-  // If we did, are we still at the start of the input?
-  __ leap(rax, Operand(rsi, rdi, times_1, 0));
-  __ cmpp(rax, Operand(rbp, kInputStart));
-  BranchOrBacktrack(equal, on_at_start);
-  __ bind(&not_at_start);
-}
-
-
-void RegExpMacroAssemblerX64::CheckNotAtStart(Label* on_not_at_start) {
-  // Did we start the match at the start of the string at all?
-  __ cmpl(Operand(rbp, kStartIndex), Immediate(0));
-  BranchOrBacktrack(not_equal, on_not_at_start);
-  // If we did, are we still at the start of the input?
-  __ leap(rax, Operand(rsi, rdi, times_1, 0));
-  __ cmpp(rax, Operand(rbp, kInputStart));
-  BranchOrBacktrack(not_equal, on_not_at_start);
-}
-
-
-void RegExpMacroAssemblerX64::CheckCharacterLT(uc16 limit, Label* on_less) {
-  __ cmpl(current_character(), Immediate(limit));
-  BranchOrBacktrack(less, on_less);
-}
-
-
-void RegExpMacroAssemblerX64::CheckGreedyLoop(Label* on_equal) {
-  Label fallthrough;
-  __ cmpl(rdi, Operand(backtrack_stackpointer(), 0));
-  __ j(not_equal, &fallthrough);
-  Drop();
-  BranchOrBacktrack(no_condition, on_equal);
-  __ bind(&fallthrough);
-}
-
-
-void RegExpMacroAssemblerX64::CheckNotBackReferenceIgnoreCase(
-    int start_reg,
-    Label* on_no_match) {
-  Label fallthrough;
-  ReadPositionFromRegister(rdx, start_reg);  // Offset of start of capture
-  ReadPositionFromRegister(rbx, start_reg + 1);  // Offset of end of capture
-  __ subp(rbx, rdx);  // Length of capture.
-
-  // -----------------------
-  // rdx  = Start offset of capture.
-  // rbx = Length of capture
-
-  // If length is negative, this code will fail (it's a symptom of a partial or
-  // illegal capture where start of capture after end of capture).
-  // This must not happen (no back-reference can reference a capture that wasn't
-  // closed before in the reg-exp, and we must not generate code that can cause
-  // this condition).
-
-  // If length is zero, either the capture is empty or it is nonparticipating.
-  // In either case succeed immediately.
-  __ j(equal, &fallthrough);
-
-  // -----------------------
-  // rdx - Start of capture
-  // rbx - length of capture
-  // Check that there are sufficient characters left in the input.
-  __ movl(rax, rdi);
-  __ addl(rax, rbx);
-  BranchOrBacktrack(greater, on_no_match);
-
-  if (mode_ == LATIN1) {
-    Label loop_increment;
-    if (on_no_match == NULL) {
-      on_no_match = &backtrack_label_;
-    }
-
-    __ leap(r9, Operand(rsi, rdx, times_1, 0));
-    __ leap(r11, Operand(rsi, rdi, times_1, 0));
-    __ addp(rbx, r9);  // End of capture
-    // ---------------------
-    // r11 - current input character address
-    // r9 - current capture character address
-    // rbx - end of capture
-
-    Label loop;
-    __ bind(&loop);
-    __ movzxbl(rdx, Operand(r9, 0));
-    __ movzxbl(rax, Operand(r11, 0));
-    // al - input character
-    // dl - capture character
-    __ cmpb(rax, rdx);
-    __ j(equal, &loop_increment);
-
-    // Mismatch, try case-insensitive match (converting letters to lower-case).
-    // I.e., if or-ing with 0x20 makes values equal and in range 'a'-'z', it's
-    // a match.
-    __ orp(rax, Immediate(0x20));  // Convert match character to lower-case.
-    __ orp(rdx, Immediate(0x20));  // Convert capture character to lower-case.
-    __ cmpb(rax, rdx);
-    __ j(not_equal, on_no_match);  // Definitely not equal.
-    __ subb(rax, Immediate('a'));
-    __ cmpb(rax, Immediate('z' - 'a'));
-    __ j(below_equal, &loop_increment);  // In range 'a'-'z'.
-    // Latin-1: Check for values in range [224,254] but not 247.
-    __ subb(rax, Immediate(224 - 'a'));
-    __ cmpb(rax, Immediate(254 - 224));
-    __ j(above, on_no_match);  // Weren't Latin-1 letters.
-    __ cmpb(rax, Immediate(247 - 224));  // Check for 247.
-    __ j(equal, on_no_match);
-    __ bind(&loop_increment);
-    // Increment pointers into match and capture strings.
-    __ addp(r11, Immediate(1));
-    __ addp(r9, Immediate(1));
-    // Compare to end of capture, and loop if not done.
-    __ cmpp(r9, rbx);
-    __ j(below, &loop);
-
-    // Compute new value of character position after the matched part.
-    __ movp(rdi, r11);
-    __ subq(rdi, rsi);
-  } else {
-    DCHECK(mode_ == UC16);
-    // Save important/volatile registers before calling C function.
-#ifndef _WIN64
-    // Caller save on Linux and callee save in Windows.
-    __ pushq(rsi);
-    __ pushq(rdi);
-#endif
-    __ pushq(backtrack_stackpointer());
-
-    static const int num_arguments = 4;
-    __ PrepareCallCFunction(num_arguments);
-
-    // Put arguments into parameter registers. 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
-#ifdef _WIN64
-    // Compute and set byte_offset1 (start of capture).
-    __ leap(rcx, Operand(rsi, rdx, times_1, 0));
-    // Set byte_offset2.
-    __ leap(rdx, Operand(rsi, rdi, times_1, 0));
-    // Set byte_length.
-    __ movp(r8, rbx);
-    // Isolate.
-    __ LoadAddress(r9, ExternalReference::isolate_address(isolate()));
-#else  // AMD64 calling convention
-    // Compute byte_offset2 (current position = rsi+rdi).
-    __ leap(rax, Operand(rsi, rdi, times_1, 0));
-    // Compute and set byte_offset1 (start of capture).
-    __ leap(rdi, Operand(rsi, rdx, times_1, 0));
-    // Set byte_offset2.
-    __ movp(rsi, rax);
-    // Set byte_length.
-    __ movp(rdx, rbx);
-    // Isolate.
-    __ LoadAddress(rcx, ExternalReference::isolate_address(isolate()));
-#endif
-
-    { // NOLINT: Can't find a way to open this scope without confusing the
-      // linter.
-      AllowExternalCallThatCantCauseGC scope(&masm_);
-      ExternalReference compare =
-          ExternalReference::re_case_insensitive_compare_uc16(isolate());
-      __ CallCFunction(compare, num_arguments);
-    }
-
-    // Restore original values before reacting on result value.
-    __ Move(code_object_pointer(), masm_.CodeObject());
-    __ popq(backtrack_stackpointer());
-#ifndef _WIN64
-    __ popq(rdi);
-    __ popq(rsi);
-#endif
-
-    // Check if function returned non-zero for success or zero for failure.
-    __ testp(rax, rax);
-    BranchOrBacktrack(zero, on_no_match);
-    // On success, increment position by length of capture.
-    // Requires that rbx is callee save (true for both Win64 and AMD64 ABIs).
-    __ addq(rdi, rbx);
-  }
-  __ bind(&fallthrough);
-}
-
-
-void RegExpMacroAssemblerX64::CheckNotBackReference(
-    int start_reg,
-    Label* on_no_match) {
-  Label fallthrough;
-
-  // Find length of back-referenced capture.
-  ReadPositionFromRegister(rdx, start_reg);  // Offset of start of capture
-  ReadPositionFromRegister(rax, start_reg + 1);  // Offset of end of capture
-  __ subp(rax, rdx);  // Length to check.
-
-  // Fail on partial or illegal capture (start of capture after end of capture).
-  // This must not happen (no back-reference can reference a capture that wasn't
-  // closed before in the reg-exp).
-  __ Check(greater_equal, kInvalidCaptureReferenced);
-
-  // Succeed on empty capture (including non-participating capture)
-  __ j(equal, &fallthrough);
-
-  // -----------------------
-  // rdx - Start of capture
-  // rax - length of capture
-
-  // Check that there are sufficient characters left in the input.
-  __ movl(rbx, rdi);
-  __ addl(rbx, rax);
-  BranchOrBacktrack(greater, on_no_match);
-
-  // Compute pointers to match string and capture string
-  __ leap(rbx, Operand(rsi, rdi, times_1, 0));  // Start of match.
-  __ addp(rdx, rsi);  // Start of capture.
-  __ leap(r9, Operand(rdx, rax, times_1, 0));  // End of capture
-
-  // -----------------------
-  // rbx - current capture character address.
-  // rbx - current input character address .
-  // r9 - end of input to match (capture length after rbx).
-
-  Label loop;
-  __ bind(&loop);
-  if (mode_ == LATIN1) {
-    __ movzxbl(rax, Operand(rdx, 0));
-    __ cmpb(rax, Operand(rbx, 0));
-  } else {
-    DCHECK(mode_ == UC16);
-    __ movzxwl(rax, Operand(rdx, 0));
-    __ cmpw(rax, Operand(rbx, 0));
-  }
-  BranchOrBacktrack(not_equal, on_no_match);
-  // Increment pointers into capture and match string.
-  __ addp(rbx, Immediate(char_size()));
-  __ addp(rdx, Immediate(char_size()));
-  // Check if we have reached end of match area.
-  __ cmpp(rdx, r9);
-  __ j(below, &loop);
-
-  // Success.
-  // Set current character position to position after match.
-  __ movp(rdi, rbx);
-  __ subq(rdi, rsi);
-
-  __ bind(&fallthrough);
-}
-
-
-void RegExpMacroAssemblerX64::CheckNotCharacter(uint32_t c,
-                                                Label* on_not_equal) {
-  __ cmpl(current_character(), Immediate(c));
-  BranchOrBacktrack(not_equal, on_not_equal);
-}
-
-
-void RegExpMacroAssemblerX64::CheckCharacterAfterAnd(uint32_t c,
-                                                     uint32_t mask,
-                                                     Label* on_equal) {
-  if (c == 0) {
-    __ testl(current_character(), Immediate(mask));
-  } else {
-    __ movl(rax, Immediate(mask));
-    __ andp(rax, current_character());
-    __ cmpl(rax, Immediate(c));
-  }
-  BranchOrBacktrack(equal, on_equal);
-}
-
-
-void RegExpMacroAssemblerX64::CheckNotCharacterAfterAnd(uint32_t c,
-                                                        uint32_t mask,
-                                                        Label* on_not_equal) {
-  if (c == 0) {
-    __ testl(current_character(), Immediate(mask));
-  } else {
-    __ movl(rax, Immediate(mask));
-    __ andp(rax, current_character());
-    __ cmpl(rax, Immediate(c));
-  }
-  BranchOrBacktrack(not_equal, on_not_equal);
-}
-
-
-void RegExpMacroAssemblerX64::CheckNotCharacterAfterMinusAnd(
-    uc16 c,
-    uc16 minus,
-    uc16 mask,
-    Label* on_not_equal) {
-  DCHECK(minus < String::kMaxUtf16CodeUnit);
-  __ leap(rax, Operand(current_character(), -minus));
-  __ andp(rax, Immediate(mask));
-  __ cmpl(rax, Immediate(c));
-  BranchOrBacktrack(not_equal, on_not_equal);
-}
-
-
-void RegExpMacroAssemblerX64::CheckCharacterInRange(
-    uc16 from,
-    uc16 to,
-    Label* on_in_range) {
-  __ leal(rax, Operand(current_character(), -from));
-  __ cmpl(rax, Immediate(to - from));
-  BranchOrBacktrack(below_equal, on_in_range);
-}
-
-
-void RegExpMacroAssemblerX64::CheckCharacterNotInRange(
-    uc16 from,
-    uc16 to,
-    Label* on_not_in_range) {
-  __ leal(rax, Operand(current_character(), -from));
-  __ cmpl(rax, Immediate(to - from));
-  BranchOrBacktrack(above, on_not_in_range);
-}
-
-
-void RegExpMacroAssemblerX64::CheckBitInTable(
-    Handle<ByteArray> table,
-    Label* on_bit_set) {
-  __ Move(rax, table);
-  Register index = current_character();
-  if (mode_ != LATIN1 || kTableMask != String::kMaxOneByteCharCode) {
-    __ movp(rbx, current_character());
-    __ andp(rbx, Immediate(kTableMask));
-    index = rbx;
-  }
-  __ cmpb(FieldOperand(rax, index, times_1, ByteArray::kHeaderSize),
-          Immediate(0));
-  BranchOrBacktrack(not_equal, on_bit_set);
-}
-
-
-bool RegExpMacroAssemblerX64::CheckSpecialCharacterClass(uc16 type,
-                                                         Label* on_no_match) {
-  // Range checks (c in min..max) are generally implemented by an unsigned
-  // (c - min) <= (max - min) check, using the sequence:
-  //   leap(rax, Operand(current_character(), -min)) or sub(rax, Immediate(min))
-  //   cmp(rax, Immediate(max - min))
-  switch (type) {
-  case 's':
-    // Match space-characters
-    if (mode_ == LATIN1) {
-      // One byte space characters are '\t'..'\r', ' ' and \u00a0.
-      Label success;
-      __ cmpl(current_character(), Immediate(' '));
-      __ j(equal, &success, Label::kNear);
-      // Check range 0x09..0x0d
-      __ leap(rax, Operand(current_character(), -'\t'));
-      __ cmpl(rax, Immediate('\r' - '\t'));
-      __ j(below_equal, &success, Label::kNear);
-      // \u00a0 (NBSP).
-      __ cmpl(rax, Immediate(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')
-    __ leap(rax, Operand(current_character(), -'0'));
-    __ cmpl(rax, Immediate('9' - '0'));
-    BranchOrBacktrack(above, on_no_match);
-    return true;
-  case 'D':
-    // Match non ASCII-digits
-    __ leap(rax, Operand(current_character(), -'0'));
-    __ cmpl(rax, Immediate('9' - '0'));
-    BranchOrBacktrack(below_equal, on_no_match);
-    return true;
-  case '.': {
-    // Match non-newlines (not 0x0a('\n'), 0x0d('\r'), 0x2028 and 0x2029)
-    __ movl(rax, current_character());
-    __ xorp(rax, Immediate(0x01));
-    // See if current character is '\n'^1 or '\r'^1, i.e., 0x0b or 0x0c
-    __ subl(rax, Immediate(0x0b));
-    __ cmpl(rax, Immediate(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.
-      __ subl(rax, Immediate(0x2028 - 0x0b));
-      __ cmpl(rax, Immediate(0x2029 - 0x2028));
-      BranchOrBacktrack(below_equal, on_no_match);
-    }
-    return true;
-  }
-  case 'n': {
-    // Match newlines (0x0a('\n'), 0x0d('\r'), 0x2028 and 0x2029)
-    __ movl(rax, current_character());
-    __ xorp(rax, Immediate(0x01));
-    // See if current character is '\n'^1 or '\r'^1, i.e., 0x0b or 0x0c
-    __ subl(rax, Immediate(0x0b));
-    __ cmpl(rax, Immediate(0x0c - 0x0b));
-    if (mode_ == LATIN1) {
-      BranchOrBacktrack(above, on_no_match);
-    } else {
-      Label done;
-      BranchOrBacktrack(below_equal, &done);
-      // Compare original value to 0x2028 and 0x2029, using the already
-      // computed (current_char ^ 0x01 - 0x0b). I.e., check for
-      // 0x201d (0x2028 - 0x0b) or 0x201e.
-      __ subl(rax, Immediate(0x2028 - 0x0b));
-      __ cmpl(rax, Immediate(0x2029 - 0x2028));
-      BranchOrBacktrack(above, on_no_match);
-      __ bind(&done);
-    }
-    return true;
-  }
-  case 'w': {
-    if (mode_ != LATIN1) {
-      // Table is 256 entries, so all Latin1 characters can be tested.
-      __ cmpl(current_character(), Immediate('z'));
-      BranchOrBacktrack(above, on_no_match);
-    }
-    __ Move(rbx, ExternalReference::re_word_character_map());
-    DCHECK_EQ(0, word_character_map[0]);  // Character '\0' is not a word char.
-    __ testb(Operand(rbx, current_character(), times_1, 0),
-             current_character());
-    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.
-      __ cmpl(current_character(), Immediate('z'));
-      __ j(above, &done);
-    }
-    __ Move(rbx, ExternalReference::re_word_character_map());
-    DCHECK_EQ(0, word_character_map[0]);  // Character '\0' is not a word char.
-    __ testb(Operand(rbx, current_character(), times_1, 0),
-             current_character());
-    BranchOrBacktrack(not_zero, on_no_match);
-    if (mode_ != LATIN1) {
-      __ bind(&done);
-    }
-    return true;
-  }
-
-  case '*':
-    // Match any character.
-    return true;
-  // No custom implementation (yet): s(UC16), S(UC16).
-  default:
-    return false;
-  }
-}
-
-
-void RegExpMacroAssemblerX64::Fail() {
-  STATIC_ASSERT(FAILURE == 0);  // Return value for failure is zero.
-  if (!global()) {
-    __ Set(rax, FAILURE);
-  }
-  __ jmp(&exit_label_);
-}
-
-
-Handle<HeapObject> RegExpMacroAssemblerX64::GetCode(Handle<String> source) {
-  Label return_rax;
-  // 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
-  // is generated.
-  FrameScope scope(&masm_, StackFrame::MANUAL);
-
-  // Actually emit code to start a new stack frame.
-  __ pushq(rbp);
-  __ movp(rbp, rsp);
-  // Save parameters and callee-save registers. Order here should correspond
-  //  to order of kBackup_ebx etc.
-#ifdef _WIN64
-  // MSVC passes arguments in rcx, rdx, r8, r9, with backing stack slots.
-  // Store register parameters in pre-allocated stack slots,
-  __ movq(Operand(rbp, kInputString), rcx);
-  __ movq(Operand(rbp, kStartIndex), rdx);  // Passed as int32 in edx.
-  __ movq(Operand(rbp, kInputStart), r8);
-  __ movq(Operand(rbp, kInputEnd), r9);
-  // Callee-save on Win64.
-  __ pushq(rsi);
-  __ pushq(rdi);
-  __ pushq(rbx);
-#else
-  // GCC passes arguments in rdi, rsi, rdx, rcx, r8, r9 (and then on stack).
-  // Push register parameters on stack for reference.
-  DCHECK_EQ(kInputString, -1 * kRegisterSize);
-  DCHECK_EQ(kStartIndex, -2 * kRegisterSize);
-  DCHECK_EQ(kInputStart, -3 * kRegisterSize);
-  DCHECK_EQ(kInputEnd, -4 * kRegisterSize);
-  DCHECK_EQ(kRegisterOutput, -5 * kRegisterSize);
-  DCHECK_EQ(kNumOutputRegisters, -6 * kRegisterSize);
-  __ pushq(rdi);
-  __ pushq(rsi);
-  __ pushq(rdx);
-  __ pushq(rcx);
-  __ pushq(r8);
-  __ pushq(r9);
-
-  __ pushq(rbx);  // Callee-save
-#endif
-
-  __ 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());
-  __ movp(rcx, rsp);
-  __ Move(kScratchRegister, stack_limit);
-  __ subp(rcx, Operand(kScratchRegister, 0));
-  // 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.
-  __ cmpp(rcx, Immediate(num_registers_ * kPointerSize));
-  __ j(above_equal, &stack_ok);
-  // Exit with OutOfMemory exception. There is not enough space on the stack
-  // for our working registers.
-  __ Set(rax, EXCEPTION);
-  __ jmp(&return_rax);
-
-  __ bind(&stack_limit_hit);
-  __ Move(code_object_pointer(), masm_.CodeObject());
-  CallCheckStackGuardState();  // Preserves no registers beside rbp and rsp.
-  __ testp(rax, rax);
-  // If returned value is non-zero, we exit with the returned value as result.
-  __ j(not_zero, &return_rax);
-
-  __ bind(&stack_ok);
-
-  // Allocate space on stack for registers.
-  __ subp(rsp, Immediate(num_registers_ * kPointerSize));
-  // Load string length.
-  __ movp(rsi, Operand(rbp, kInputEnd));
-  // Load input position.
-  __ movp(rdi, Operand(rbp, kInputStart));
-  // Set up rdi to be negative offset from string end.
-  __ subq(rdi, rsi);
-  // Set rax to address of char before start of the string
-  // (effectively string position -1).
-  __ movp(rbx, Operand(rbp, kStartIndex));
-  __ negq(rbx);
-  if (mode_ == UC16) {
-    __ leap(rax, Operand(rdi, rbx, times_2, -char_size()));
-  } else {
-    __ leap(rax, Operand(rdi, rbx, times_1, -char_size()));
-  }
-  // Store this value in a local variable, for use when clearing
-  // position registers.
-  __ movp(Operand(rbp, kInputStartMinusOne), rax);
-
-#if V8_OS_WIN
-  // 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) {
-    __ movp(register_location(i), rax);  // One write every page.
-  }
-#endif  // V8_OS_WIN
-
-  // Initialize code object pointer.
-  __ Move(code_object_pointer(), masm_.CodeObject());
-
-  Label load_char_start_regexp, start_regexp;
-  // Load newline if index is at start, previous character otherwise.
-  __ cmpl(Operand(rbp, kStartIndex), Immediate(0));
-  __ j(not_equal, &load_char_start_regexp, Label::kNear);
-  __ Set(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) {
-    // 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) {
-      __ Set(rcx, kRegisterZero);
-      Label init_loop;
-      __ bind(&init_loop);
-      __ movp(Operand(rbp, rcx, times_1, 0), rax);
-      __ subq(rcx, Immediate(kPointerSize));
-      __ cmpq(rcx,
-              Immediate(kRegisterZero - num_saved_registers_ * kPointerSize));
-      __ j(greater, &init_loop);
-    } else {  // Unroll the loop.
-      for (int i = 0; i < num_saved_registers_; i++) {
-        __ movp(register_location(i), rax);
-      }
-    }
-  }
-
-  // Initialize backtrack stack pointer.
-  __ movp(backtrack_stackpointer(), Operand(rbp, 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
-      __ movp(rdx, Operand(rbp, kStartIndex));
-      __ movp(rbx, Operand(rbp, kRegisterOutput));
-      __ movp(rcx, Operand(rbp, kInputEnd));
-      __ subp(rcx, Operand(rbp, kInputStart));
-      if (mode_ == UC16) {
-        __ leap(rcx, Operand(rcx, rdx, times_2, 0));
-      } else {
-        __ addp(rcx, rdx);
-      }
-      for (int i = 0; i < num_saved_registers_; i++) {
-        __ movp(rax, register_location(i));
-        if (i == 0 && global_with_zero_length_check()) {
-          // Keep capture start in rdx for the zero-length check later.
-          __ movp(rdx, rax);
-        }
-        __ addp(rax, rcx);  // Convert to index from start, not end.
-        if (mode_ == UC16) {
-          __ sarp(rax, Immediate(1));  // Convert byte index to character index.
-        }
-        __ movl(Operand(rbx, i * kIntSize), rax);
-      }
-    }
-
-    if (global()) {
-      // Restart matching if the regular expression is flagged as global.
-      // Increment success counter.
-      __ incp(Operand(rbp, kSuccessfulCaptures));
-      // Capture results have been stored, so the number of remaining global
-      // output registers is reduced by the number of stored captures.
-      __ movsxlq(rcx, Operand(rbp, kNumOutputRegisters));
-      __ subp(rcx, Immediate(num_saved_registers_));
-      // Check whether we have enough room for another set of capture results.
-      __ cmpp(rcx, Immediate(num_saved_registers_));
-      __ j(less, &exit_label_);
-
-      __ movp(Operand(rbp, kNumOutputRegisters), rcx);
-      // Advance the location for output.
-      __ addp(Operand(rbp, kRegisterOutput),
-              Immediate(num_saved_registers_ * kIntSize));
-
-      // Prepare rax to initialize registers with its value in the next run.
-      __ movp(rax, Operand(rbp, kInputStartMinusOne));
-
-      if (global_with_zero_length_check()) {
-        // Special case for zero-length matches.
-        // rdx: capture start index
-        __ cmpp(rdi, rdx);
-        // Not a zero-length match, restart.
-        __ j(not_equal, &load_char_start_regexp);
-        // rdi (offset from the end) is zero if we already reached the end.
-        __ testp(rdi, rdi);
-        __ j(zero, &exit_label_, Label::kNear);
-        // Advance current position after a zero-length match.
-        if (mode_ == UC16) {
-          __ addq(rdi, Immediate(2));
-        } else {
-          __ incq(rdi);
-        }
-      }
-
-      __ jmp(&load_char_start_regexp);
-    } else {
-      __ movp(rax, Immediate(SUCCESS));
-    }
-  }
-
-  __ bind(&exit_label_);
-  if (global()) {
-    // Return the number of successful captures.
-    __ movp(rax, Operand(rbp, kSuccessfulCaptures));
-  }
-
-  __ bind(&return_rax);
-#ifdef _WIN64
-  // Restore callee save registers.
-  __ leap(rsp, Operand(rbp, kLastCalleeSaveRegister));
-  __ popq(rbx);
-  __ popq(rdi);
-  __ popq(rsi);
-  // Stack now at rbp.
-#else
-  // Restore callee save register.
-  __ movp(rbx, Operand(rbp, kBackup_rbx));
-  // Skip rsp to rbp.
-  __ movp(rsp, rbp);
-#endif
-  // Exit function frame, restore previous one.
-  __ popq(rbp);
-  __ 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_);
-
-    __ pushq(backtrack_stackpointer());
-    __ pushq(rdi);
-
-    CallCheckStackGuardState();
-    __ testp(rax, rax);
-    // If returning non-zero, we should end execution with the given
-    // result as return value.
-    __ j(not_zero, &return_rax);
-
-    // Restore registers.
-    __ Move(code_object_pointer(), masm_.CodeObject());
-    __ popq(rdi);
-    __ popq(backtrack_stackpointer());
-    // String might have moved: Reload esi from frame.
-    __ movp(rsi, Operand(rbp, 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
-#ifndef _WIN64
-    // Callee-save in Microsoft 64-bit ABI, but not in AMD64 ABI.
-    __ pushq(rsi);
-    __ pushq(rdi);
-#endif
-
-    // Call GrowStack(backtrack_stackpointer())
-    static const int num_arguments = 3;
-    __ PrepareCallCFunction(num_arguments);
-#ifdef _WIN64
-    // Microsoft passes parameters in rcx, rdx, r8.
-    // First argument, backtrack stackpointer, is already in rcx.
-    __ leap(rdx, Operand(rbp, kStackHighEnd));  // Second argument
-    __ LoadAddress(r8, ExternalReference::isolate_address(isolate()));
-#else
-    // AMD64 ABI passes parameters in rdi, rsi, rdx.
-    __ movp(rdi, backtrack_stackpointer());   // First argument.
-    __ leap(rsi, Operand(rbp, kStackHighEnd));  // Second argument.
-    __ LoadAddress(rdx, ExternalReference::isolate_address(isolate()));
-#endif
-    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.
-    __ testp(rax, rax);
-    __ j(equal, &exit_with_exception);
-    // Otherwise use return value as new stack pointer.
-    __ movp(backtrack_stackpointer(), rax);
-    // Restore saved registers and continue.
-    __ Move(code_object_pointer(), masm_.CodeObject());
-#ifndef _WIN64
-    __ popq(rdi);
-    __ popq(rsi);
-#endif
-    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.
-    __ Set(rax, EXCEPTION);
-    __ jmp(&return_rax);
-  }
-
-  FixupCodeRelativePositions();
-
-  CodeDesc code_desc;
-  masm_.GetCode(&code_desc);
-  Isolate* isolate = this->isolate();
-  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 RegExpMacroAssemblerX64::GoTo(Label* to) {
-  BranchOrBacktrack(no_condition, to);
-}
-
-
-void RegExpMacroAssemblerX64::IfRegisterGE(int reg,
-                                           int comparand,
-                                           Label* if_ge) {
-  __ cmpp(register_location(reg), Immediate(comparand));
-  BranchOrBacktrack(greater_equal, if_ge);
-}
-
-
-void RegExpMacroAssemblerX64::IfRegisterLT(int reg,
-                                           int comparand,
-                                           Label* if_lt) {
-  __ cmpp(register_location(reg), Immediate(comparand));
-  BranchOrBacktrack(less, if_lt);
-}
-
-
-void RegExpMacroAssemblerX64::IfRegisterEqPos(int reg,
-                                              Label* if_eq) {
-  __ cmpp(rdi, register_location(reg));
-  BranchOrBacktrack(equal, if_eq);
-}
-
-
-RegExpMacroAssembler::IrregexpImplementation
-    RegExpMacroAssemblerX64::Implementation() {
-  return kX64Implementation;
-}
-
-
-void RegExpMacroAssemblerX64::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 RegExpMacroAssemblerX64::PopCurrentPosition() {
-  Pop(rdi);
-}
-
-
-void RegExpMacroAssemblerX64::PopRegister(int register_index) {
-  Pop(rax);
-  __ movp(register_location(register_index), rax);
-}
-
-
-void RegExpMacroAssemblerX64::PushBacktrack(Label* label) {
-  Push(label);
-  CheckStackLimit();
-}
-
-
-void RegExpMacroAssemblerX64::PushCurrentPosition() {
-  Push(rdi);
-}
-
-
-void RegExpMacroAssemblerX64::PushRegister(int register_index,
-                                           StackCheckFlag check_stack_limit) {
-  __ movp(rax, register_location(register_index));
-  Push(rax);
-  if (check_stack_limit) CheckStackLimit();
-}
-
-
-STATIC_ASSERT(kPointerSize == kInt64Size || kPointerSize == kInt32Size);
-
-
-void RegExpMacroAssemblerX64::ReadCurrentPositionFromRegister(int reg) {
-  if (kPointerSize == kInt64Size) {
-    __ movq(rdi, register_location(reg));
-  } else {
-    // Need sign extension for x32 as rdi might be used as an index register.
-    __ movsxlq(rdi, register_location(reg));
-  }
-}
-
-
-void RegExpMacroAssemblerX64::ReadPositionFromRegister(Register dst, int reg) {
-  if (kPointerSize == kInt64Size) {
-    __ movq(dst, register_location(reg));
-  } else {
-    // Need sign extension for x32 as dst might be used as an index register.
-    __ movsxlq(dst, register_location(reg));
-  }
-}
-
-
-void RegExpMacroAssemblerX64::ReadStackPointerFromRegister(int reg) {
-  __ movp(backtrack_stackpointer(), register_location(reg));
-  __ addp(backtrack_stackpointer(), Operand(rbp, kStackHighEnd));
-}
-
-
-void RegExpMacroAssemblerX64::SetCurrentPositionFromEnd(int by) {
-  Label after_position;
-  __ cmpp(rdi, Immediate(-by * char_size()));
-  __ j(greater_equal, &after_position, Label::kNear);
-  __ movq(rdi, Immediate(-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 RegExpMacroAssemblerX64::SetRegister(int register_index, int to) {
-  DCHECK(register_index >= num_saved_registers_);  // Reserved for positions!
-  __ movp(register_location(register_index), Immediate(to));
-}
-
-
-bool RegExpMacroAssemblerX64::Succeed() {
-  __ jmp(&success_label_);
-  return global();
-}
-
-
-void RegExpMacroAssemblerX64::WriteCurrentPositionToRegister(int reg,
-                                                             int cp_offset) {
-  if (cp_offset == 0) {
-    __ movp(register_location(reg), rdi);
-  } else {
-    __ leap(rax, Operand(rdi, cp_offset * char_size()));
-    __ movp(register_location(reg), rax);
-  }
-}
-
-
-void RegExpMacroAssemblerX64::ClearRegisters(int reg_from, int reg_to) {
-  DCHECK(reg_from <= reg_to);
-  __ movp(rax, Operand(rbp, kInputStartMinusOne));
-  for (int reg = reg_from; reg <= reg_to; reg++) {
-    __ movp(register_location(reg), rax);
-  }
-}
-
-
-void RegExpMacroAssemblerX64::WriteStackPointerToRegister(int reg) {
-  __ movp(rax, backtrack_stackpointer());
-  __ subp(rax, Operand(rbp, kStackHighEnd));
-  __ movp(register_location(reg), rax);
-}
-
-
-// Private methods:
-
-void RegExpMacroAssemblerX64::CallCheckStackGuardState() {
-  // This function call preserves no register values. Caller should
-  // store anything volatile in a C call or overwritten by this function.
-  static const int num_arguments = 3;
-  __ PrepareCallCFunction(num_arguments);
-#ifdef _WIN64
-  // Second argument: Code* of self. (Do this before overwriting r8).
-  __ movp(rdx, code_object_pointer());
-  // Third argument: RegExp code frame pointer.
-  __ movp(r8, rbp);
-  // First argument: Next address on the stack (will be address of
-  // return address).
-  __ leap(rcx, Operand(rsp, -kPointerSize));
-#else
-  // Third argument: RegExp code frame pointer.
-  __ movp(rdx, rbp);
-  // Second argument: Code* of self.
-  __ movp(rsi, code_object_pointer());
-  // First argument: Next address on the stack (will be address of
-  // return address).
-  __ leap(rdi, Operand(rsp, -kRegisterSize));
-#endif
-  ExternalReference stack_check =
-      ExternalReference::re_check_stack_guard_state(isolate());
-  __ CallCFunction(stack_check, 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 RegExpMacroAssemblerX64::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 RegExpMacroAssemblerX64::register_location(int register_index) {
-  DCHECK(register_index < (1<<30));
-  if (num_registers_ <= register_index) {
-    num_registers_ = register_index + 1;
-  }
-  return Operand(rbp, kRegisterZero - register_index * kPointerSize);
-}
-
-
-void RegExpMacroAssemblerX64::CheckPosition(int cp_offset,
-                                            Label* on_outside_input) {
-  __ cmpl(rdi, Immediate(-cp_offset * char_size()));
-  BranchOrBacktrack(greater_equal, on_outside_input);
-}
-
-
-void RegExpMacroAssemblerX64::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 RegExpMacroAssemblerX64::SafeCall(Label* to) {
-  __ call(to);
-}
-
-
-void RegExpMacroAssemblerX64::SafeCallTarget(Label* label) {
-  __ bind(label);
-  __ subp(Operand(rsp, 0), code_object_pointer());
-}
-
-
-void RegExpMacroAssemblerX64::SafeReturn() {
-  __ addp(Operand(rsp, 0), code_object_pointer());
-  __ ret(0);
-}
-
-
-void RegExpMacroAssemblerX64::Push(Register source) {
-  DCHECK(!source.is(backtrack_stackpointer()));
-  // Notice: This updates flags, unlike normal Push.
-  __ subp(backtrack_stackpointer(), Immediate(kIntSize));
-  __ movl(Operand(backtrack_stackpointer(), 0), source);
-}
-
-
-void RegExpMacroAssemblerX64::Push(Immediate value) {
-  // Notice: This updates flags, unlike normal Push.
-  __ subp(backtrack_stackpointer(), Immediate(kIntSize));
-  __ movl(Operand(backtrack_stackpointer(), 0), value);
-}
-
-
-void RegExpMacroAssemblerX64::FixupCodeRelativePositions() {
-  for (int i = 0, n = code_relative_fixup_positions_.length(); i < n; i++) {
-    int position = code_relative_fixup_positions_[i];
-    // The position succeeds a relative label offset from position.
-    // Patch the relative offset to be relative to the Code object pointer
-    // instead.
-    int patch_position = position - kIntSize;
-    int offset = masm_.long_at(patch_position);
-    masm_.long_at_put(patch_position,
-                       offset
-                       + position
-                       + Code::kHeaderSize
-                       - kHeapObjectTag);
-  }
-  code_relative_fixup_positions_.Clear();
-}
-
-
-void RegExpMacroAssemblerX64::Push(Label* backtrack_target) {
-  __ subp(backtrack_stackpointer(), Immediate(kIntSize));
-  __ movl(Operand(backtrack_stackpointer(), 0), backtrack_target);
-  MarkPositionForCodeRelativeFixup();
-}
-
-
-void RegExpMacroAssemblerX64::Pop(Register target) {
-  DCHECK(!target.is(backtrack_stackpointer()));
-  __ movsxlq(target, Operand(backtrack_stackpointer(), 0));
-  // Notice: This updates flags, unlike normal Pop.
-  __ addp(backtrack_stackpointer(), Immediate(kIntSize));
-}
-
-
-void RegExpMacroAssemblerX64::Drop() {
-  __ addp(backtrack_stackpointer(), Immediate(kIntSize));
-}
-
-
-void RegExpMacroAssemblerX64::CheckPreemption() {
-  // Check for preemption.
-  Label no_preempt;
-  ExternalReference stack_limit =
-      ExternalReference::address_of_stack_limit(isolate());
-  __ load_rax(stack_limit);
-  __ cmpp(rsp, rax);
-  __ j(above, &no_preempt);
-
-  SafeCall(&check_preempt_label_);
-
-  __ bind(&no_preempt);
-}
-
-
-void RegExpMacroAssemblerX64::CheckStackLimit() {
-  Label no_stack_overflow;
-  ExternalReference stack_limit =
-      ExternalReference::address_of_regexp_stack_limit(isolate());
-  __ load_rax(stack_limit);
-  __ cmpp(backtrack_stackpointer(), rax);
-  __ j(above, &no_stack_overflow);
-
-  SafeCall(&stack_overflow_label_);
-
-  __ bind(&no_stack_overflow);
-}
-
-
-void RegExpMacroAssemblerX64::LoadCurrentCharacterUnchecked(int cp_offset,
-                                                            int characters) {
-  if (mode_ == LATIN1) {
-    if (characters == 4) {
-      __ movl(current_character(), Operand(rsi, rdi, times_1, cp_offset));
-    } else if (characters == 2) {
-      __ movzxwl(current_character(), Operand(rsi, rdi, times_1, cp_offset));
-    } else {
-      DCHECK(characters == 1);
-      __ movzxbl(current_character(), Operand(rsi, rdi, times_1, cp_offset));
-    }
-  } else {
-    DCHECK(mode_ == UC16);
-    if (characters == 2) {
-      __ movl(current_character(),
-              Operand(rsi, rdi, times_1, cp_offset * sizeof(uc16)));
-    } else {
-      DCHECK(characters == 1);
-      __ movzxwl(current_character(),
-                 Operand(rsi, rdi, times_1, cp_offset * sizeof(uc16)));
-    }
-  }
-}
-
-#undef __
-
-#endif  // V8_INTERPRETED_REGEXP
-
-}  // namespace internal
-}  // namespace v8
-
-#endif  // V8_TARGET_ARCH_X64