Move regexp implementation into its own folder.

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

Index: src/mips/regexp-macro-assembler-mips.cc
diff --git a/src/mips/regexp-macro-assembler-mips.cc b/src/mips/regexp-macro-assembler-mips.cc
deleted file mode 100644
index f29802130dfab880e0cf3910a8cc7f5be6893af7..0000000000000000000000000000000000000000
--- a/src/mips/regexp-macro-assembler-mips.cc
+++ /dev/null
@@ -1,1247 +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_MIPS
-
-#include "src/code-stubs.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/mips/regexp-macro-assembler-mips.h"
-
-namespace v8 {
-namespace internal {
-
-#ifndef V8_INTERPRETED_REGEXP
-/*
- * This assembler uses the following register assignment convention
- * - t7 : Temporarily stores the index of capture start after a matching pass
- *        for a global regexp.
- * - t1 : Pointer to current code object (Code*) including heap object tag.
- * - t2 : Current position in input, as negative offset from end of string.
- *        Please notice that this is the byte offset, not the character offset!
- * - t3 : Currently loaded character. Must be loaded using
- *        LoadCurrentCharacter before using any of the dispatch methods.
- * - t4 : Points to tip of backtrack stack
- * - t5 : Unused.
- * - t6 : End of input (points to byte after last character in input).
- * - fp : Frame pointer. Used to access arguments, local variables and
- *         RegExp registers.
- * - sp : Points to tip of C stack.
- *
- * The remaining registers are free for computations.
- * Each call to a public method should retain this convention.
- *
- * The stack will have the following structure:
- *
- *  - fp[64]  Isolate* isolate   (address of the current isolate)
- *  - fp[60]  direct_call  (if 1, direct call from JavaScript code,
- *                          if 0, call through the runtime system).
- *  - fp[56]  stack_area_base (High end of the memory area to use as
- *                             backtracking stack).
- *  - fp[52]  capture array size (may fit multiple sets of matches)
- *  - fp[48]  int* capture_array (int[num_saved_registers_], for output).
- *  - fp[44]  secondary link/return address used by native call.
- *  --- sp when called ---
- *  - fp[40]  return address      (lr).
- *  - fp[36]  old frame pointer   (r11).
- *  - fp[0..32]  backup of registers s0..s7.
- *  --- frame pointer ----
- *  - fp[-4]  end of input       (address of end of string).
- *  - fp[-8]  start of input     (address of first character in string).
- *  - fp[-12] start index        (character index of start).
- *  - fp[-16] void* input_string (location of a handle containing the string).
- *  - fp[-20] success counter    (only for global regexps to count matches).
- *  - fp[-24] Offset of location before start of input (effectively character
- *            position -1). Used to initialize capture registers to a
- *            non-position.
- *  - fp[-28] At start (if 1, we are starting at the start of the
- *    string, otherwise 0)
- *  - fp[-32] register 0         (Only positions must be stored in the first
- *  -         register 1          num_saved_registers_ registers)
- *  -         ...
- *  -         register num_registers-1
- *  --- sp ---
- *
- * 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 start out as garbage.
- *
- * The data up to the return address must be placed there by the calling
- * code and the remaining arguments are passed in registers, e.g. 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,
- *              Address secondary_return_address,  // Only used by native call.
- *              int* capture_output_array,
- *              byte* stack_area_base,
- *              bool direct_call = false)
- * The call is performed by NativeRegExpMacroAssembler::Execute()
- * (in regexp-macro-assembler.cc) via the CALL_GENERATED_REGEXP_CODE macro
- * in mips/simulator-mips.h.
- * When calling as a non-direct call (i.e., from C++ code), the return address
- * area is overwritten with the ra register by the RegExp code. When doing a
- * direct call from generated code, the return address is placed there by
- * the calling code, as in a normal exit frame.
- */
-
-#define __ ACCESS_MASM(masm_)
-
-RegExpMacroAssemblerMIPS::RegExpMacroAssemblerMIPS(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_(),
-      internal_failure_label_() {
-  DCHECK_EQ(0, registers_to_save % 2);
-  __ jmp(&entry_label_);   // We'll write the entry code later.
-  // If the code gets too big or corrupted, an internal exception will be
-  // raised, and we will exit right away.
-  __ bind(&internal_failure_label_);
-  __ li(v0, Operand(FAILURE));
-  __ Ret();
-  __ bind(&start_label_);  // And then continue from here.
-}
-
-
-RegExpMacroAssemblerMIPS::~RegExpMacroAssemblerMIPS() {
-  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();
-  internal_failure_label_.Unuse();
-}
-
-
-int RegExpMacroAssemblerMIPS::stack_limit_slack()  {
-  return RegExpStack::kStackLimitSlack;
-}
-
-
-void RegExpMacroAssemblerMIPS::AdvanceCurrentPosition(int by) {
-  if (by != 0) {
-    __ Addu(current_input_offset(),
-            current_input_offset(), Operand(by * char_size()));
-  }
-}
-
-
-void RegExpMacroAssemblerMIPS::AdvanceRegister(int reg, int by) {
-  DCHECK(reg >= 0);
-  DCHECK(reg < num_registers_);
-  if (by != 0) {
-    __ lw(a0, register_location(reg));
-    __ Addu(a0, a0, Operand(by));
-    __ sw(a0, register_location(reg));
-  }
-}
-
-
-void RegExpMacroAssemblerMIPS::Backtrack() {
-  CheckPreemption();
-  // Pop Code* offset from backtrack stack, add Code* and jump to location.
-  Pop(a0);
-  __ Addu(a0, a0, code_pointer());
-  __ Jump(a0);
-}
-
-
-void RegExpMacroAssemblerMIPS::Bind(Label* label) {
-  __ bind(label);
-}
-
-
-void RegExpMacroAssemblerMIPS::CheckCharacter(uint32_t c, Label* on_equal) {
-  BranchOrBacktrack(on_equal, eq, current_character(), Operand(c));
-}
-
-
-void RegExpMacroAssemblerMIPS::CheckCharacterGT(uc16 limit, Label* on_greater) {
-  BranchOrBacktrack(on_greater, gt, current_character(), Operand(limit));
-}
-
-
-void RegExpMacroAssemblerMIPS::CheckAtStart(Label* on_at_start) {
-  Label not_at_start;
-  // Did we start the match at the start of the string at all?
-  __ lw(a0, MemOperand(frame_pointer(), kStartIndex));
-  BranchOrBacktrack(&not_at_start, ne, a0, Operand(zero_reg));
-
-  // If we did, are we still at the start of the input?
-  __ lw(a1, MemOperand(frame_pointer(), kInputStart));
-  __ Addu(a0, end_of_input_address(), Operand(current_input_offset()));
-  BranchOrBacktrack(on_at_start, eq, a0, Operand(a1));
-  __ bind(&not_at_start);
-}
-
-
-void RegExpMacroAssemblerMIPS::CheckNotAtStart(Label* on_not_at_start) {
-  // Did we start the match at the start of the string at all?
-  __ lw(a0, MemOperand(frame_pointer(), kStartIndex));
-  BranchOrBacktrack(on_not_at_start, ne, a0, Operand(zero_reg));
-  // If we did, are we still at the start of the input?
-  __ lw(a1, MemOperand(frame_pointer(), kInputStart));
-  __ Addu(a0, end_of_input_address(), Operand(current_input_offset()));
-  BranchOrBacktrack(on_not_at_start, ne, a0, Operand(a1));
-}
-
-
-void RegExpMacroAssemblerMIPS::CheckCharacterLT(uc16 limit, Label* on_less) {
-  BranchOrBacktrack(on_less, lt, current_character(), Operand(limit));
-}
-
-
-void RegExpMacroAssemblerMIPS::CheckGreedyLoop(Label* on_equal) {
-  Label backtrack_non_equal;
-  __ lw(a0, MemOperand(backtrack_stackpointer(), 0));
-  __ Branch(&backtrack_non_equal, ne, current_input_offset(), Operand(a0));
-  __ Addu(backtrack_stackpointer(),
-          backtrack_stackpointer(),
-          Operand(kPointerSize));
-  __ bind(&backtrack_non_equal);
-  BranchOrBacktrack(on_equal, eq, current_input_offset(), Operand(a0));
-}
-
-
-void RegExpMacroAssemblerMIPS::CheckNotBackReferenceIgnoreCase(
-    int start_reg,
-    Label* on_no_match) {
-  Label fallthrough;
-  __ lw(a0, register_location(start_reg));  // Index of start of capture.
-  __ lw(a1, register_location(start_reg + 1));  // Index of end of capture.
-  __ Subu(a1, a1, a0);  // Length of capture.
-
-  // If length is zero, either the capture is empty or it is not participating.
-  // In either case succeed immediately.
-  __ Branch(&fallthrough, eq, a1, Operand(zero_reg));
-
-  __ Addu(t5, a1, current_input_offset());
-  // Check that there are enough characters left in the input.
-  BranchOrBacktrack(on_no_match, gt, t5, Operand(zero_reg));
-
-  if (mode_ == LATIN1) {
-    Label success;
-    Label fail;
-    Label loop_check;
-
-    // a0 - offset of start of capture.
-    // a1 - length of capture.
-    __ Addu(a0, a0, Operand(end_of_input_address()));
-    __ Addu(a2, end_of_input_address(), Operand(current_input_offset()));
-    __ Addu(a1, a0, Operand(a1));
-
-    // a0 - Address of start of capture.
-    // a1 - Address of end of capture.
-    // a2 - Address of current input position.
-
-    Label loop;
-    __ bind(&loop);
-    __ lbu(a3, MemOperand(a0, 0));
-    __ addiu(a0, a0, char_size());
-    __ lbu(t0, MemOperand(a2, 0));
-    __ addiu(a2, a2, char_size());
-
-    __ Branch(&loop_check, eq, t0, Operand(a3));
-
-    // Mismatch, try case-insensitive match (converting letters to lower-case).
-    __ Or(a3, a3, Operand(0x20));  // Convert capture character to lower-case.
-    __ Or(t0, t0, Operand(0x20));  // Also convert input character.
-    __ Branch(&fail, ne, t0, Operand(a3));
-    __ Subu(a3, a3, Operand('a'));
-    __ Branch(&loop_check, ls, a3, Operand('z' - 'a'));
-    // Latin-1: Check for values in range [224,254] but not 247.
-    __ Subu(a3, a3, Operand(224 - 'a'));
-    // Weren't Latin-1 letters.
-    __ Branch(&fail, hi, a3, Operand(254 - 224));
-    // Check for 247.
-    __ Branch(&fail, eq, a3, Operand(247 - 224));
-
-    __ bind(&loop_check);
-    __ Branch(&loop, lt, a0, Operand(a1));
-    __ jmp(&success);
-
-    __ bind(&fail);
-    GoTo(on_no_match);
-
-    __ bind(&success);
-    // Compute new value of character position after the matched part.
-    __ Subu(current_input_offset(), a2, end_of_input_address());
-  } else {
-    DCHECK(mode_ == UC16);
-    // Put regexp engine registers on stack.
-    RegList regexp_registers_to_retain = current_input_offset().bit() |
-        current_character().bit() | backtrack_stackpointer().bit();
-    __ MultiPush(regexp_registers_to_retain);
-
-    int argument_count = 4;
-    __ PrepareCallCFunction(argument_count, a2);
-
-    // a0 - offset of start of capture.
-    // a1 - length of capture.
-
-    // Put arguments into arguments registers.
-    // Parameters are
-    //   a0: Address byte_offset1 - Address captured substring's start.
-    //   a1: Address byte_offset2 - Address of current character position.
-    //   a2: size_t byte_length - length of capture in bytes(!).
-    //   a3: Isolate* isolate.
-
-    // Address of start of capture.
-    __ Addu(a0, a0, Operand(end_of_input_address()));
-    // Length of capture.
-    __ mov(a2, a1);
-    // Save length in callee-save register for use on return.
-    __ mov(s3, a1);
-    // Address of current input position.
-    __ Addu(a1, current_input_offset(), Operand(end_of_input_address()));
-    // Isolate.
-    __ li(a3, Operand(ExternalReference::isolate_address(masm_->isolate())));
-
-    {
-      AllowExternalCallThatCantCauseGC scope(masm_);
-      ExternalReference function =
-          ExternalReference::re_case_insensitive_compare_uc16(masm_->isolate());
-      __ CallCFunction(function, argument_count);
-    }
-
-    // Restore regexp engine registers.
-    __ MultiPop(regexp_registers_to_retain);
-    __ li(code_pointer(), Operand(masm_->CodeObject()), CONSTANT_SIZE);
-    __ lw(end_of_input_address(), MemOperand(frame_pointer(), kInputEnd));
-
-    // Check if function returned non-zero for success or zero for failure.
-    BranchOrBacktrack(on_no_match, eq, v0, Operand(zero_reg));
-    // On success, increment position by length of capture.
-    __ Addu(current_input_offset(), current_input_offset(), Operand(s3));
-  }
-
-  __ bind(&fallthrough);
-}
-
-
-void RegExpMacroAssemblerMIPS::CheckNotBackReference(
-    int start_reg,
-    Label* on_no_match) {
-  Label fallthrough;
-  Label success;
-
-  // Find length of back-referenced capture.
-  __ lw(a0, register_location(start_reg));
-  __ lw(a1, register_location(start_reg + 1));
-  __ Subu(a1, a1, a0);  // Length to check.
-  // Succeed on empty capture (including no capture).
-  __ Branch(&fallthrough, eq, a1, Operand(zero_reg));
-
-  __ Addu(t5, a1, current_input_offset());
-  // Check that there are enough characters left in the input.
-  BranchOrBacktrack(on_no_match, gt, t5, Operand(zero_reg));
-
-  // Compute pointers to match string and capture string.
-  __ Addu(a0, a0, Operand(end_of_input_address()));
-  __ Addu(a2, end_of_input_address(), Operand(current_input_offset()));
-  __ Addu(a1, a1, Operand(a0));
-
-  Label loop;
-  __ bind(&loop);
-  if (mode_ == LATIN1) {
-    __ lbu(a3, MemOperand(a0, 0));
-    __ addiu(a0, a0, char_size());
-    __ lbu(t0, MemOperand(a2, 0));
-    __ addiu(a2, a2, char_size());
-  } else {
-    DCHECK(mode_ == UC16);
-    __ lhu(a3, MemOperand(a0, 0));
-    __ addiu(a0, a0, char_size());
-    __ lhu(t0, MemOperand(a2, 0));
-    __ addiu(a2, a2, char_size());
-  }
-  BranchOrBacktrack(on_no_match, ne, a3, Operand(t0));
-  __ Branch(&loop, lt, a0, Operand(a1));
-
-  // Move current character position to position after match.
-  __ Subu(current_input_offset(), a2, end_of_input_address());
-  __ bind(&fallthrough);
-}
-
-
-void RegExpMacroAssemblerMIPS::CheckNotCharacter(uint32_t c,
-                                                 Label* on_not_equal) {
-  BranchOrBacktrack(on_not_equal, ne, current_character(), Operand(c));
-}
-
-
-void RegExpMacroAssemblerMIPS::CheckCharacterAfterAnd(uint32_t c,
-                                                      uint32_t mask,
-                                                      Label* on_equal) {
-  __ And(a0, current_character(), Operand(mask));
-  Operand rhs = (c == 0) ? Operand(zero_reg) : Operand(c);
-  BranchOrBacktrack(on_equal, eq, a0, rhs);
-}
-
-
-void RegExpMacroAssemblerMIPS::CheckNotCharacterAfterAnd(uint32_t c,
-                                                         uint32_t mask,
-                                                         Label* on_not_equal) {
-  __ And(a0, current_character(), Operand(mask));
-  Operand rhs = (c == 0) ? Operand(zero_reg) : Operand(c);
-  BranchOrBacktrack(on_not_equal, ne, a0, rhs);
-}
-
-
-void RegExpMacroAssemblerMIPS::CheckNotCharacterAfterMinusAnd(
-    uc16 c,
-    uc16 minus,
-    uc16 mask,
-    Label* on_not_equal) {
-  DCHECK(minus < String::kMaxUtf16CodeUnit);
-  __ Subu(a0, current_character(), Operand(minus));
-  __ And(a0, a0, Operand(mask));
-  BranchOrBacktrack(on_not_equal, ne, a0, Operand(c));
-}
-
-
-void RegExpMacroAssemblerMIPS::CheckCharacterInRange(
-    uc16 from,
-    uc16 to,
-    Label* on_in_range) {
-  __ Subu(a0, current_character(), Operand(from));
-  // Unsigned lower-or-same condition.
-  BranchOrBacktrack(on_in_range, ls, a0, Operand(to - from));
-}
-
-
-void RegExpMacroAssemblerMIPS::CheckCharacterNotInRange(
-    uc16 from,
-    uc16 to,
-    Label* on_not_in_range) {
-  __ Subu(a0, current_character(), Operand(from));
-  // Unsigned higher condition.
-  BranchOrBacktrack(on_not_in_range, hi, a0, Operand(to - from));
-}
-
-
-void RegExpMacroAssemblerMIPS::CheckBitInTable(
-    Handle<ByteArray> table,
-    Label* on_bit_set) {
-  __ li(a0, Operand(table));
-  if (mode_ != LATIN1 || kTableMask != String::kMaxOneByteCharCode) {
-    __ And(a1, current_character(), Operand(kTableSize - 1));
-    __ Addu(a0, a0, a1);
-  } else {
-    __ Addu(a0, a0, current_character());
-  }
-
-  __ lbu(a0, FieldMemOperand(a0, ByteArray::kHeaderSize));
-  BranchOrBacktrack(on_bit_set, ne, a0, Operand(zero_reg));
-}
-
-
-bool RegExpMacroAssemblerMIPS::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;
-      __ Branch(&success, eq, current_character(), Operand(' '));
-      // Check range 0x09..0x0d.
-      __ Subu(a0, current_character(), Operand('\t'));
-      __ Branch(&success, ls, a0, Operand('\r' - '\t'));
-      // \u00a0 (NBSP).
-      BranchOrBacktrack(on_no_match, ne, a0, Operand(0x00a0 - '\t'));
-      __ bind(&success);
-      return true;
-    }
-    return false;
-  case 'S':
-    // The emitted code for generic character classes is good enough.
-    return false;
-  case 'd':
-    // Match Latin1 digits ('0'..'9').
-    __ Subu(a0, current_character(), Operand('0'));
-    BranchOrBacktrack(on_no_match, hi, a0, Operand('9' - '0'));
-    return true;
-  case 'D':
-    // Match non Latin1-digits.
-    __ Subu(a0, current_character(), Operand('0'));
-    BranchOrBacktrack(on_no_match, ls, a0, Operand('9' - '0'));
-    return true;
-  case '.': {
-    // Match non-newlines (not 0x0a('\n'), 0x0d('\r'), 0x2028 and 0x2029).
-    __ Xor(a0, current_character(), Operand(0x01));
-    // See if current character is '\n'^1 or '\r'^1, i.e., 0x0b or 0x0c.
-    __ Subu(a0, a0, Operand(0x0b));
-    BranchOrBacktrack(on_no_match, ls, a0, Operand(0x0c - 0x0b));
-    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.
-      __ Subu(a0, a0, Operand(0x2028 - 0x0b));
-      BranchOrBacktrack(on_no_match, ls, a0, Operand(1));
-    }
-    return true;
-  }
-  case 'n': {
-    // Match newlines (0x0a('\n'), 0x0d('\r'), 0x2028 and 0x2029).
-    __ Xor(a0, current_character(), Operand(0x01));
-    // See if current character is '\n'^1 or '\r'^1, i.e., 0x0b or 0x0c.
-    __ Subu(a0, a0, Operand(0x0b));
-    if (mode_ == LATIN1) {
-      BranchOrBacktrack(on_no_match, hi, a0, Operand(0x0c - 0x0b));
-    } else {
-      Label done;
-      BranchOrBacktrack(&done, ls, a0, Operand(0x0c - 0x0b));
-      // Compare original value to 0x2028 and 0x2029, using the already
-      // computed (current_char ^ 0x01 - 0x0b). I.e., check for
-      // 0x201d (0x2028 - 0x0b) or 0x201e.
-      __ Subu(a0, a0, Operand(0x2028 - 0x0b));
-      BranchOrBacktrack(on_no_match, hi, a0, Operand(1));
-      __ bind(&done);
-    }
-    return true;
-  }
-  case 'w': {
-    if (mode_ != LATIN1) {
-      // Table is 256 entries, so all Latin1 characters can be tested.
-      BranchOrBacktrack(on_no_match, hi, current_character(), Operand('z'));
-    }
-    ExternalReference map = ExternalReference::re_word_character_map();
-    __ li(a0, Operand(map));
-    __ Addu(a0, a0, current_character());
-    __ lbu(a0, MemOperand(a0, 0));
-    BranchOrBacktrack(on_no_match, eq, a0, Operand(zero_reg));
-    return true;
-  }
-  case 'W': {
-    Label done;
-    if (mode_ != LATIN1) {
-      // Table is 256 entries, so all Latin1 characters can be tested.
-      __ Branch(&done, hi, current_character(), Operand('z'));
-    }
-    ExternalReference map = ExternalReference::re_word_character_map();
-    __ li(a0, Operand(map));
-    __ Addu(a0, a0, current_character());
-    __ lbu(a0, MemOperand(a0, 0));
-    BranchOrBacktrack(on_no_match, ne, a0, Operand(zero_reg));
-    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 RegExpMacroAssemblerMIPS::Fail() {
-  __ li(v0, Operand(FAILURE));
-  __ jmp(&exit_label_);
-}
-
-
-Handle<HeapObject> RegExpMacroAssemblerMIPS::GetCode(Handle<String> source) {
-  Label return_v0;
-  if (masm_->has_exception()) {
-    // If the code gets corrupted due to long regular expressions and lack of
-    // space on trampolines, an internal exception flag is set. If this case
-    // is detected, we will jump into exit sequence right away.
-    __ bind_to(&entry_label_, internal_failure_label_.pos());
-  } else {
-    // 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.
-    // Push arguments
-    // Save callee-save registers.
-    // Start new stack frame.
-    // Store link register in existing stack-cell.
-    // Order here should correspond to order of offset constants in header file.
-    RegList registers_to_retain = s0.bit() | s1.bit() | s2.bit() |
-        s3.bit() | s4.bit() | s5.bit() | s6.bit() | s7.bit() | fp.bit();
-    RegList argument_registers = a0.bit() | a1.bit() | a2.bit() | a3.bit();
-    __ MultiPush(argument_registers | registers_to_retain | ra.bit());
-    // Set frame pointer in space for it if this is not a direct call
-    // from generated code.
-    __ Addu(frame_pointer(), sp, Operand(4 * kPointerSize));
-    __ mov(a0, zero_reg);
-    __ push(a0);  // Make room for success counter and initialize it to 0.
-    __ push(a0);  // Make room for "position - 1" constant (value irrelevant).
-
-    // 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(masm_->isolate());
-    __ li(a0, Operand(stack_limit));
-    __ lw(a0, MemOperand(a0));
-    __ Subu(a0, sp, a0);
-    // Handle it if the stack pointer is already below the stack limit.
-    __ Branch(&stack_limit_hit, le, a0, Operand(zero_reg));
-    // Check if there is room for the variable number of registers above
-    // the stack limit.
-    __ Branch(&stack_ok, hs, a0, Operand(num_registers_ * kPointerSize));
-    // Exit with OutOfMemory exception. There is not enough space on the stack
-    // for our working registers.
-    __ li(v0, Operand(EXCEPTION));
-    __ jmp(&return_v0);
-
-    __ bind(&stack_limit_hit);
-    CallCheckStackGuardState(a0);
-    // If returned value is non-zero, we exit with the returned value as result.
-    __ Branch(&return_v0, ne, v0, Operand(zero_reg));
-
-    __ bind(&stack_ok);
-    // Allocate space on stack for registers.
-    __ Subu(sp, sp, Operand(num_registers_ * kPointerSize));
-    // Load string end.
-    __ lw(end_of_input_address(), MemOperand(frame_pointer(), kInputEnd));
-    // Load input start.
-    __ lw(a0, MemOperand(frame_pointer(), kInputStart));
-    // Find negative length (offset of start relative to end).
-    __ Subu(current_input_offset(), a0, end_of_input_address());
-    // Set a0 to address of char before start of the input string
-    // (effectively string position -1).
-    __ lw(a1, MemOperand(frame_pointer(), kStartIndex));
-    __ Subu(a0, current_input_offset(), Operand(char_size()));
-    __ sll(t5, a1, (mode_ == UC16) ? 1 : 0);
-    __ Subu(a0, a0, t5);
-    // Store this value in a local variable, for use when clearing
-    // position registers.
-    __ sw(a0, MemOperand(frame_pointer(), kInputStartMinusOne));
-
-    // Initialize code pointer register
-    __ li(code_pointer(), Operand(masm_->CodeObject()), CONSTANT_SIZE);
-
-    Label load_char_start_regexp, start_regexp;
-    // Load newline if index is at start, previous character otherwise.
-    __ Branch(&load_char_start_regexp, ne, a1, Operand(zero_reg));
-    __ li(current_character(), Operand('\n'));
-    __ jmp(&start_regexp);
-
-    // 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.
-      if (num_saved_registers_ > 8) {
-        // Address of register 0.
-        __ Addu(a1, frame_pointer(), Operand(kRegisterZero));
-        __ li(a2, Operand(num_saved_registers_));
-        Label init_loop;
-        __ bind(&init_loop);
-        __ sw(a0, MemOperand(a1));
-        __ Addu(a1, a1, Operand(-kPointerSize));
-        __ Subu(a2, a2, Operand(1));
-        __ Branch(&init_loop, ne, a2, Operand(zero_reg));
-      } else {
-        for (int i = 0; i < num_saved_registers_; i++) {
-          __ sw(a0, register_location(i));
-        }
-      }
-    }
-
-    // Initialize backtrack stack pointer.
-    __ lw(backtrack_stackpointer(), MemOperand(frame_pointer(), 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.
-        __ lw(a1, MemOperand(frame_pointer(), kInputStart));
-        __ lw(a0, MemOperand(frame_pointer(), kRegisterOutput));
-        __ lw(a2, MemOperand(frame_pointer(), kStartIndex));
-        __ Subu(a1, end_of_input_address(), a1);
-        // a1 is length of input in bytes.
-        if (mode_ == UC16) {
-          __ srl(a1, a1, 1);
-        }
-        // a1 is length of input in characters.
-        __ Addu(a1, a1, Operand(a2));
-        // a1 is length of string in characters.
-
-        DCHECK_EQ(0, num_saved_registers_ % 2);
-        // Always an even number of capture registers. This allows us to
-        // unroll the loop once to add an operation between a load of a register
-        // and the following use of that register.
-        for (int i = 0; i < num_saved_registers_; i += 2) {
-          __ lw(a2, register_location(i));
-          __ lw(a3, register_location(i + 1));
-          if (i == 0 && global_with_zero_length_check()) {
-            // Keep capture start in a4 for the zero-length check later.
-            __ mov(t7, a2);
-          }
-          if (mode_ == UC16) {
-            __ sra(a2, a2, 1);
-            __ Addu(a2, a2, a1);
-            __ sra(a3, a3, 1);
-            __ Addu(a3, a3, a1);
-          } else {
-            __ Addu(a2, a1, Operand(a2));
-            __ Addu(a3, a1, Operand(a3));
-          }
-          __ sw(a2, MemOperand(a0));
-          __ Addu(a0, a0, kPointerSize);
-          __ sw(a3, MemOperand(a0));
-          __ Addu(a0, a0, kPointerSize);
-        }
-      }
-
-      if (global()) {
-        // Restart matching if the regular expression is flagged as global.
-        __ lw(a0, MemOperand(frame_pointer(), kSuccessfulCaptures));
-        __ lw(a1, MemOperand(frame_pointer(), kNumOutputRegisters));
-        __ lw(a2, MemOperand(frame_pointer(), kRegisterOutput));
-        // Increment success counter.
-        __ Addu(a0, a0, 1);
-        __ sw(a0, MemOperand(frame_pointer(), kSuccessfulCaptures));
-        // Capture results have been stored, so the number of remaining global
-        // output registers is reduced by the number of stored captures.
-        __ Subu(a1, a1, num_saved_registers_);
-        // Check whether we have enough room for another set of capture results.
-        __ mov(v0, a0);
-        __ Branch(&return_v0, lt, a1, Operand(num_saved_registers_));
-
-        __ sw(a1, MemOperand(frame_pointer(), kNumOutputRegisters));
-        // Advance the location for output.
-        __ Addu(a2, a2, num_saved_registers_ * kPointerSize);
-        __ sw(a2, MemOperand(frame_pointer(), kRegisterOutput));
-
-        // Prepare a0 to initialize registers with its value in the next run.
-        __ lw(a0, MemOperand(frame_pointer(), kInputStartMinusOne));
-
-        if (global_with_zero_length_check()) {
-          // Special case for zero-length matches.
-          // t7: capture start index
-          // Not a zero-length match, restart.
-          __ Branch(
-              &load_char_start_regexp, ne, current_input_offset(), Operand(t7));
-          // Offset from the end is zero if we already reached the end.
-          __ Branch(&exit_label_, eq, current_input_offset(),
-                    Operand(zero_reg));
-          // Advance current position after a zero-length match.
-          __ Addu(current_input_offset(),
-                  current_input_offset(),
-                  Operand((mode_ == UC16) ? 2 : 1));
-        }
-
-        __ Branch(&load_char_start_regexp);
-      } else {
-        __ li(v0, Operand(SUCCESS));
-      }
-    }
-    // Exit and return v0.
-    __ bind(&exit_label_);
-    if (global()) {
-      __ lw(v0, MemOperand(frame_pointer(), kSuccessfulCaptures));
-    }
-
-    __ bind(&return_v0);
-    // Skip sp past regexp registers and local variables..
-    __ mov(sp, frame_pointer());
-    // Restore registers s0..s7 and return (restoring ra to pc).
-    __ MultiPop(registers_to_retain | ra.bit());
-    __ Ret();
-
-    // 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_);
-      // Put regexp engine registers on stack.
-      RegList regexp_registers_to_retain = current_input_offset().bit() |
-          current_character().bit() | backtrack_stackpointer().bit();
-      __ MultiPush(regexp_registers_to_retain);
-      CallCheckStackGuardState(a0);
-      __ MultiPop(regexp_registers_to_retain);
-      // If returning non-zero, we should end execution with the given
-      // result as return value.
-      __ Branch(&return_v0, ne, v0, Operand(zero_reg));
-
-      // String might have moved: Reload end of string from frame.
-      __ lw(end_of_input_address(), MemOperand(frame_pointer(), kInputEnd));
-      __ li(code_pointer(), Operand(masm_->CodeObject()), CONSTANT_SIZE);
-      SafeReturn();
-    }
-
-    // Backtrack stack overflow code.
-    if (stack_overflow_label_.is_linked()) {
-      SafeCallTarget(&stack_overflow_label_);
-      // Reached if the backtrack-stack limit has been hit.
-      // Put regexp engine registers on stack first.
-      RegList regexp_registers = current_input_offset().bit() |
-          current_character().bit();
-      __ MultiPush(regexp_registers);
-      Label grow_failed;
-      // Call GrowStack(backtrack_stackpointer(), &stack_base)
-      static const int num_arguments = 3;
-      __ PrepareCallCFunction(num_arguments, a0);
-      __ mov(a0, backtrack_stackpointer());
-      __ Addu(a1, frame_pointer(), Operand(kStackHighEnd));
-      __ li(a2, Operand(ExternalReference::isolate_address(masm_->isolate())));
-      ExternalReference grow_stack =
-          ExternalReference::re_grow_stack(masm_->isolate());
-      __ CallCFunction(grow_stack, num_arguments);
-      // Restore regexp registers.
-      __ MultiPop(regexp_registers);
-      // If return NULL, we have failed to grow the stack, and
-      // must exit with a stack-overflow exception.
-      __ Branch(&exit_with_exception, eq, v0, Operand(zero_reg));
-      // Otherwise use return value as new stack pointer.
-      __ mov(backtrack_stackpointer(), v0);
-      // Restore saved registers and continue.
-      __ li(code_pointer(), Operand(masm_->CodeObject()), CONSTANT_SIZE);
-      __ lw(end_of_input_address(), MemOperand(frame_pointer(), kInputEnd));
-      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.
-      __ li(v0, Operand(EXCEPTION));
-      __ jmp(&return_v0);
-    }
-  }
-
-  CodeDesc code_desc;
-  masm_->GetCode(&code_desc);
-  Handle<Code> code = isolate()->factory()->NewCode(
-      code_desc, Code::ComputeFlags(Code::REGEXP), masm_->CodeObject());
-  LOG(masm_->isolate(), RegExpCodeCreateEvent(*code, *source));
-  return Handle<HeapObject>::cast(code);
-}
-
-
-void RegExpMacroAssemblerMIPS::GoTo(Label* to) {
-  if (to == NULL) {
-    Backtrack();
-    return;
-  }
-  __ jmp(to);
-  return;
-}
-
-
-void RegExpMacroAssemblerMIPS::IfRegisterGE(int reg,
-                                            int comparand,
-                                            Label* if_ge) {
-  __ lw(a0, register_location(reg));
-    BranchOrBacktrack(if_ge, ge, a0, Operand(comparand));
-}
-
-
-void RegExpMacroAssemblerMIPS::IfRegisterLT(int reg,
-                                            int comparand,
-                                            Label* if_lt) {
-  __ lw(a0, register_location(reg));
-  BranchOrBacktrack(if_lt, lt, a0, Operand(comparand));
-}
-
-
-void RegExpMacroAssemblerMIPS::IfRegisterEqPos(int reg,
-                                               Label* if_eq) {
-  __ lw(a0, register_location(reg));
-  BranchOrBacktrack(if_eq, eq, a0, Operand(current_input_offset()));
-}
-
-
-RegExpMacroAssembler::IrregexpImplementation
-    RegExpMacroAssemblerMIPS::Implementation() {
-  return kMIPSImplementation;
-}
-
-
-void RegExpMacroAssemblerMIPS::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 RegExpMacroAssemblerMIPS::PopCurrentPosition() {
-  Pop(current_input_offset());
-}
-
-
-void RegExpMacroAssemblerMIPS::PopRegister(int register_index) {
-  Pop(a0);
-  __ sw(a0, register_location(register_index));
-}
-
-
-void RegExpMacroAssemblerMIPS::PushBacktrack(Label* label) {
-  if (label->is_bound()) {
-    int target = label->pos();
-    __ li(a0, Operand(target + Code::kHeaderSize - kHeapObjectTag));
-  } else {
-    Assembler::BlockTrampolinePoolScope block_trampoline_pool(masm_);
-    Label after_constant;
-    __ Branch(&after_constant);
-    int offset = masm_->pc_offset();
-    int cp_offset = offset + Code::kHeaderSize - kHeapObjectTag;
-    __ emit(0);
-    masm_->label_at_put(label, offset);
-    __ bind(&after_constant);
-    if (is_int16(cp_offset)) {
-      __ lw(a0, MemOperand(code_pointer(), cp_offset));
-    } else {
-      __ Addu(a0, code_pointer(), cp_offset);
-      __ lw(a0, MemOperand(a0, 0));
-    }
-  }
-  Push(a0);
-  CheckStackLimit();
-}
-
-
-void RegExpMacroAssemblerMIPS::PushCurrentPosition() {
-  Push(current_input_offset());
-}
-
-
-void RegExpMacroAssemblerMIPS::PushRegister(int register_index,
-                                            StackCheckFlag check_stack_limit) {
-  __ lw(a0, register_location(register_index));
-  Push(a0);
-  if (check_stack_limit) CheckStackLimit();
-}
-
-
-void RegExpMacroAssemblerMIPS::ReadCurrentPositionFromRegister(int reg) {
-  __ lw(current_input_offset(), register_location(reg));
-}
-
-
-void RegExpMacroAssemblerMIPS::ReadStackPointerFromRegister(int reg) {
-  __ lw(backtrack_stackpointer(), register_location(reg));
-  __ lw(a0, MemOperand(frame_pointer(), kStackHighEnd));
-  __ Addu(backtrack_stackpointer(), backtrack_stackpointer(), Operand(a0));
-}
-
-
-void RegExpMacroAssemblerMIPS::SetCurrentPositionFromEnd(int by) {
-  Label after_position;
-  __ Branch(&after_position,
-            ge,
-            current_input_offset(),
-            Operand(-by * char_size()));
-  __ li(current_input_offset(), -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 RegExpMacroAssemblerMIPS::SetRegister(int register_index, int to) {
-  DCHECK(register_index >= num_saved_registers_);  // Reserved for positions!
-  __ li(a0, Operand(to));
-  __ sw(a0, register_location(register_index));
-}
-
-
-bool RegExpMacroAssemblerMIPS::Succeed() {
-  __ jmp(&success_label_);
-  return global();
-}
-
-
-void RegExpMacroAssemblerMIPS::WriteCurrentPositionToRegister(int reg,
-                                                              int cp_offset) {
-  if (cp_offset == 0) {
-    __ sw(current_input_offset(), register_location(reg));
-  } else {
-    __ Addu(a0, current_input_offset(), Operand(cp_offset * char_size()));
-    __ sw(a0, register_location(reg));
-  }
-}
-
-
-void RegExpMacroAssemblerMIPS::ClearRegisters(int reg_from, int reg_to) {
-  DCHECK(reg_from <= reg_to);
-  __ lw(a0, MemOperand(frame_pointer(), kInputStartMinusOne));
-  for (int reg = reg_from; reg <= reg_to; reg++) {
-    __ sw(a0, register_location(reg));
-  }
-}
-
-
-void RegExpMacroAssemblerMIPS::WriteStackPointerToRegister(int reg) {
-  __ lw(a1, MemOperand(frame_pointer(), kStackHighEnd));
-  __ Subu(a0, backtrack_stackpointer(), a1);
-  __ sw(a0, register_location(reg));
-}
-
-
-bool RegExpMacroAssemblerMIPS::CanReadUnaligned() {
-  return false;
-}
-
-
-// Private methods:
-
-void RegExpMacroAssemblerMIPS::CallCheckStackGuardState(Register scratch) {
-  int stack_alignment = base::OS::ActivationFrameAlignment();
-
-  // Align the stack pointer and save the original sp value on the stack.
-  __ mov(scratch, sp);
-  __ Subu(sp, sp, Operand(kPointerSize));
-  DCHECK(base::bits::IsPowerOfTwo32(stack_alignment));
-  __ And(sp, sp, Operand(-stack_alignment));
-  __ sw(scratch, MemOperand(sp));
-
-  __ mov(a2, frame_pointer());
-  // Code* of self.
-  __ li(a1, Operand(masm_->CodeObject()), CONSTANT_SIZE);
-
-  // We need to make room for the return address on the stack.
-  DCHECK(IsAligned(stack_alignment, kPointerSize));
-  __ Subu(sp, sp, Operand(stack_alignment));
-
-  // Stack pointer now points to cell where return address is to be written.
-  // Arguments are in registers, meaning we teat the return address as
-  // argument 5. Since DirectCEntryStub will handleallocating space for the C
-  // argument slots, we don't need to care about that here. This is how the
-  // stack will look (sp meaning the value of sp at this moment):
-  // [sp + 3] - empty slot if needed for alignment.
-  // [sp + 2] - saved sp.
-  // [sp + 1] - second word reserved for return value.
-  // [sp + 0] - first word reserved for return value.
-
-  // a0 will point to the return address, placed by DirectCEntry.
-  __ mov(a0, sp);
-
-  ExternalReference stack_guard_check =
-      ExternalReference::re_check_stack_guard_state(masm_->isolate());
-  __ li(t9, Operand(stack_guard_check));
-  DirectCEntryStub stub(isolate());
-  stub.GenerateCall(masm_, t9);
-
-  // DirectCEntryStub allocated space for the C argument slots so we have to
-  // drop them with the return address from the stack with loading saved sp.
-  // At this point stack must look:
-  // [sp + 7] - empty slot if needed for alignment.
-  // [sp + 6] - saved sp.
-  // [sp + 5] - second word reserved for return value.
-  // [sp + 4] - first word reserved for return value.
-  // [sp + 3] - C argument slot.
-  // [sp + 2] - C argument slot.
-  // [sp + 1] - C argument slot.
-  // [sp + 0] - C argument slot.
-  __ lw(sp, MemOperand(sp, stack_alignment + kCArgsSlotsSize));
-
-  __ li(code_pointer(), Operand(masm_->CodeObject()));
-}
-
-
-// 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 RegExpMacroAssemblerMIPS::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));
-}
-
-
-MemOperand RegExpMacroAssemblerMIPS::register_location(int register_index) {
-  DCHECK(register_index < (1<<30));
-  if (num_registers_ <= register_index) {
-    num_registers_ = register_index + 1;
-  }
-  return MemOperand(frame_pointer(),
-                    kRegisterZero - register_index * kPointerSize);
-}
-
-
-void RegExpMacroAssemblerMIPS::CheckPosition(int cp_offset,
-                                             Label* on_outside_input) {
-  BranchOrBacktrack(on_outside_input,
-                    ge,
-                    current_input_offset(),
-                    Operand(-cp_offset * char_size()));
-}
-
-
-void RegExpMacroAssemblerMIPS::BranchOrBacktrack(Label* to,
-                                                 Condition condition,
-                                                 Register rs,
-                                                 const Operand& rt) {
-  if (condition == al) {  // Unconditional.
-    if (to == NULL) {
-      Backtrack();
-      return;
-    }
-    __ jmp(to);
-    return;
-  }
-  if (to == NULL) {
-    __ Branch(&backtrack_label_, condition, rs, rt);
-    return;
-  }
-  __ Branch(to, condition, rs, rt);
-}
-
-
-void RegExpMacroAssemblerMIPS::SafeCall(Label* to,
-                                        Condition cond,
-                                        Register rs,
-                                        const Operand& rt) {
-  __ BranchAndLink(to, cond, rs, rt);
-}
-
-
-void RegExpMacroAssemblerMIPS::SafeReturn() {
-  __ pop(ra);
-  __ Addu(t5, ra, Operand(masm_->CodeObject()));
-  __ Jump(t5);
-}
-
-
-void RegExpMacroAssemblerMIPS::SafeCallTarget(Label* name) {
-  __ bind(name);
-  __ Subu(ra, ra, Operand(masm_->CodeObject()));
-  __ push(ra);
-}
-
-
-void RegExpMacroAssemblerMIPS::Push(Register source) {
-  DCHECK(!source.is(backtrack_stackpointer()));
-  __ Addu(backtrack_stackpointer(),
-          backtrack_stackpointer(),
-          Operand(-kPointerSize));
-  __ sw(source, MemOperand(backtrack_stackpointer()));
-}
-
-
-void RegExpMacroAssemblerMIPS::Pop(Register target) {
-  DCHECK(!target.is(backtrack_stackpointer()));
-  __ lw(target, MemOperand(backtrack_stackpointer()));
-  __ Addu(backtrack_stackpointer(), backtrack_stackpointer(), kPointerSize);
-}
-
-
-void RegExpMacroAssemblerMIPS::CheckPreemption() {
-  // Check for preemption.
-  ExternalReference stack_limit =
-      ExternalReference::address_of_stack_limit(masm_->isolate());
-  __ li(a0, Operand(stack_limit));
-  __ lw(a0, MemOperand(a0));
-  SafeCall(&check_preempt_label_, ls, sp, Operand(a0));
-}
-
-
-void RegExpMacroAssemblerMIPS::CheckStackLimit() {
-  ExternalReference stack_limit =
-      ExternalReference::address_of_regexp_stack_limit(masm_->isolate());
-
-  __ li(a0, Operand(stack_limit));
-  __ lw(a0, MemOperand(a0));
-  SafeCall(&stack_overflow_label_, ls, backtrack_stackpointer(), Operand(a0));
-}
-
-
-void RegExpMacroAssemblerMIPS::LoadCurrentCharacterUnchecked(int cp_offset,
-                                                             int characters) {
-  Register offset = current_input_offset();
-  if (cp_offset != 0) {
-    // t7 is not being used to store the capture start index at this point.
-    __ Addu(t7, current_input_offset(), Operand(cp_offset * char_size()));
-    offset = t7;
-  }
-  // We assume that we cannot do unaligned loads on MIPS, so this function
-  // must only be used to load a single character at a time.
-  DCHECK(characters == 1);
-  __ Addu(t5, end_of_input_address(), Operand(offset));
-  if (mode_ == LATIN1) {
-    __ lbu(current_character(), MemOperand(t5, 0));
-  } else {
-    DCHECK(mode_ == UC16);
-    __ lhu(current_character(), MemOperand(t5, 0));
-  }
-}
-
-
-#undef __
-
-#endif  // V8_INTERPRETED_REGEXP
-
-}  // namespace internal
-}  // namespace v8
-
-#endif  // V8_TARGET_ARCH_MIPS