Move regexp implementation into its own folder.

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

Index: src/arm/regexp-macro-assembler-arm.cc
diff --git a/src/arm/regexp-macro-assembler-arm.cc b/src/arm/regexp-macro-assembler-arm.cc
deleted file mode 100644
index 9f4b4af42d593822a35043b2a017f460434d46dd..0000000000000000000000000000000000000000
--- a/src/arm/regexp-macro-assembler-arm.cc
+++ /dev/null
@@ -1,1199 +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_ARM
-
-#include "src/code-stubs.h"
-#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/arm/regexp-macro-assembler-arm.h"
-
-namespace v8 {
-namespace internal {
-
-#ifndef V8_INTERPRETED_REGEXP
-/*
- * This assembler uses the following register assignment convention
- * - r4 : Temporarily stores the index of capture start after a matching pass
- *        for a global regexp.
- * - r5 : Pointer to current code object (Code*) including heap object tag.
- * - r6 : Current position in input, as negative offset from end of string.
- *        Please notice that this is the byte offset, not the character offset!
- * - r7 : Currently loaded character. Must be loaded using
- *        LoadCurrentCharacter before using any of the dispatch methods.
- * - r8 : Points to tip of backtrack stack
- * - r9 : Unused, might be used by C code and expected unchanged.
- * - r10 : End of input (points to byte after last character in input).
- * - r11 : Frame pointer. Used to access arguments, local variables and
- *         RegExp registers.
- * - r12 : IP register, used by assembler. Very volatile.
- * - r13/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[56]  Isolate* isolate   (address of the current isolate)
- *  - fp[52]  direct_call        (if 1, direct call from JavaScript code,
- *                                if 0, call through the runtime system).
- *  - fp[48]  stack_area_base    (high end of the memory area to use as
- *                                backtracking stack).
- *  - fp[44]  capture array size (may fit multiple sets of matches)
- *  - fp[40]  int* capture_array (int[num_saved_registers_], for output).
- *  - fp[36]  secondary link/return address used by native call.
- *  --- sp when called ---
- *  - fp[32]  return address     (lr).
- *  - fp[28]  old frame pointer  (r11).
- *  - fp[0..24]  backup of registers r4..r10.
- *  --- 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 arm/simulator-arm.h.
- * When calling as a non-direct call (i.e., from C++ code), the return address
- * area is overwritten with the LR 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_)
-
-RegExpMacroAssemblerARM::RegExpMacroAssemblerARM(Isolate* isolate, Zone* zone,
-                                                 Mode mode,
-                                                 int registers_to_save)
-    : NativeRegExpMacroAssembler(isolate, zone),
-      masm_(new MacroAssembler(isolate, NULL, kRegExpCodeSize)),
-      mode_(mode),
-      num_registers_(registers_to_save),
-      num_saved_registers_(registers_to_save),
-      entry_label_(),
-      start_label_(),
-      success_label_(),
-      backtrack_label_(),
-      exit_label_() {
-  DCHECK_EQ(0, registers_to_save % 2);
-  __ jmp(&entry_label_);   // We'll write the entry code later.
-  __ bind(&start_label_);  // And then continue from here.
-}
-
-
-RegExpMacroAssemblerARM::~RegExpMacroAssemblerARM() {
-  delete masm_;
-  // Unuse labels in case we throw away the assembler without calling GetCode.
-  entry_label_.Unuse();
-  start_label_.Unuse();
-  success_label_.Unuse();
-  backtrack_label_.Unuse();
-  exit_label_.Unuse();
-  check_preempt_label_.Unuse();
-  stack_overflow_label_.Unuse();
-}
-
-
-int RegExpMacroAssemblerARM::stack_limit_slack()  {
-  return RegExpStack::kStackLimitSlack;
-}
-
-
-void RegExpMacroAssemblerARM::AdvanceCurrentPosition(int by) {
-  if (by != 0) {
-    __ add(current_input_offset(),
-           current_input_offset(), Operand(by * char_size()));
-  }
-}
-
-
-void RegExpMacroAssemblerARM::AdvanceRegister(int reg, int by) {
-  DCHECK(reg >= 0);
-  DCHECK(reg < num_registers_);
-  if (by != 0) {
-    __ ldr(r0, register_location(reg));
-    __ add(r0, r0, Operand(by));
-    __ str(r0, register_location(reg));
-  }
-}
-
-
-void RegExpMacroAssemblerARM::Backtrack() {
-  CheckPreemption();
-  // Pop Code* offset from backtrack stack, add Code* and jump to location.
-  Pop(r0);
-  __ add(pc, r0, Operand(code_pointer()));
-}
-
-
-void RegExpMacroAssemblerARM::Bind(Label* label) {
-  __ bind(label);
-}
-
-
-void RegExpMacroAssemblerARM::CheckCharacter(uint32_t c, Label* on_equal) {
-  __ cmp(current_character(), Operand(c));
-  BranchOrBacktrack(eq, on_equal);
-}
-
-
-void RegExpMacroAssemblerARM::CheckCharacterGT(uc16 limit, Label* on_greater) {
-  __ cmp(current_character(), Operand(limit));
-  BranchOrBacktrack(gt, on_greater);
-}
-
-
-void RegExpMacroAssemblerARM::CheckAtStart(Label* on_at_start) {
-  Label not_at_start;
-  // Did we start the match at the start of the string at all?
-  __ ldr(r0, MemOperand(frame_pointer(), kStartIndex));
-  __ cmp(r0, Operand::Zero());
-  BranchOrBacktrack(ne, &not_at_start);
-
-  // If we did, are we still at the start of the input?
-  __ ldr(r1, MemOperand(frame_pointer(), kInputStart));
-  __ add(r0, end_of_input_address(), Operand(current_input_offset()));
-  __ cmp(r0, r1);
-  BranchOrBacktrack(eq, on_at_start);
-  __ bind(&not_at_start);
-}
-
-
-void RegExpMacroAssemblerARM::CheckNotAtStart(Label* on_not_at_start) {
-  // Did we start the match at the start of the string at all?
-  __ ldr(r0, MemOperand(frame_pointer(), kStartIndex));
-  __ cmp(r0, Operand::Zero());
-  BranchOrBacktrack(ne, on_not_at_start);
-  // If we did, are we still at the start of the input?
-  __ ldr(r1, MemOperand(frame_pointer(), kInputStart));
-  __ add(r0, end_of_input_address(), Operand(current_input_offset()));
-  __ cmp(r0, r1);
-  BranchOrBacktrack(ne, on_not_at_start);
-}
-
-
-void RegExpMacroAssemblerARM::CheckCharacterLT(uc16 limit, Label* on_less) {
-  __ cmp(current_character(), Operand(limit));
-  BranchOrBacktrack(lt, on_less);
-}
-
-
-void RegExpMacroAssemblerARM::CheckGreedyLoop(Label* on_equal) {
-  __ ldr(r0, MemOperand(backtrack_stackpointer(), 0));
-  __ cmp(current_input_offset(), r0);
-  __ add(backtrack_stackpointer(),
-         backtrack_stackpointer(), Operand(kPointerSize), LeaveCC, eq);
-  BranchOrBacktrack(eq, on_equal);
-}
-
-
-void RegExpMacroAssemblerARM::CheckNotBackReferenceIgnoreCase(
-    int start_reg,
-    Label* on_no_match) {
-  Label fallthrough;
-  __ ldr(r0, register_location(start_reg));  // Index of start of capture
-  __ ldr(r1, register_location(start_reg + 1));  // Index of end of capture
-  __ sub(r1, r1, r0, SetCC);  // Length of capture.
-
-  // If length is zero, either the capture is empty or it is not participating.
-  // In either case succeed immediately.
-  __ b(eq, &fallthrough);
-
-  // Check that there are enough characters left in the input.
-  __ cmn(r1, Operand(current_input_offset()));
-  BranchOrBacktrack(gt, on_no_match);
-
-  if (mode_ == LATIN1) {
-    Label success;
-    Label fail;
-    Label loop_check;
-
-    // r0 - offset of start of capture
-    // r1 - length of capture
-    __ add(r0, r0, Operand(end_of_input_address()));
-    __ add(r2, end_of_input_address(), Operand(current_input_offset()));
-    __ add(r1, r0, Operand(r1));
-
-    // r0 - Address of start of capture.
-    // r1 - Address of end of capture
-    // r2 - Address of current input position.
-
-    Label loop;
-    __ bind(&loop);
-    __ ldrb(r3, MemOperand(r0, char_size(), PostIndex));
-    __ ldrb(r4, MemOperand(r2, char_size(), PostIndex));
-    __ cmp(r4, r3);
-    __ b(eq, &loop_check);
-
-    // Mismatch, try case-insensitive match (converting letters to lower-case).
-    __ orr(r3, r3, Operand(0x20));  // Convert capture character to lower-case.
-    __ orr(r4, r4, Operand(0x20));  // Also convert input character.
-    __ cmp(r4, r3);
-    __ b(ne, &fail);
-    __ sub(r3, r3, Operand('a'));
-    __ cmp(r3, Operand('z' - 'a'));  // Is r3 a lowercase letter?
-    __ b(ls, &loop_check);  // In range 'a'-'z'.
-    // Latin-1: Check for values in range [224,254] but not 247.
-    __ sub(r3, r3, Operand(224 - 'a'));
-    __ cmp(r3, Operand(254 - 224));
-    __ b(hi, &fail);  // Weren't Latin-1 letters.
-    __ cmp(r3, Operand(247 - 224));  // Check for 247.
-    __ b(eq, &fail);
-
-    __ bind(&loop_check);
-    __ cmp(r0, r1);
-    __ b(lt, &loop);
-    __ jmp(&success);
-
-    __ bind(&fail);
-    BranchOrBacktrack(al, on_no_match);
-
-    __ bind(&success);
-    // Compute new value of character position after the matched part.
-    __ sub(current_input_offset(), r2, end_of_input_address());
-  } else {
-    DCHECK(mode_ == UC16);
-    int argument_count = 4;
-    __ PrepareCallCFunction(argument_count, r2);
-
-    // r0 - offset of start of capture
-    // r1 - length of capture
-
-    // Put arguments into arguments registers.
-    // Parameters are
-    //   r0: Address byte_offset1 - Address captured substring's start.
-    //   r1: Address byte_offset2 - Address of current character position.
-    //   r2: size_t byte_length - length of capture in bytes(!)
-    //   r3: Isolate* isolate
-
-    // Address of start of capture.
-    __ add(r0, r0, Operand(end_of_input_address()));
-    // Length of capture.
-    __ mov(r2, Operand(r1));
-    // Save length in callee-save register for use on return.
-    __ mov(r4, Operand(r1));
-    // Address of current input position.
-    __ add(r1, current_input_offset(), Operand(end_of_input_address()));
-    // Isolate.
-    __ mov(r3, Operand(ExternalReference::isolate_address(isolate())));
-
-    {
-      AllowExternalCallThatCantCauseGC scope(masm_);
-      ExternalReference function =
-          ExternalReference::re_case_insensitive_compare_uc16(isolate());
-      __ CallCFunction(function, argument_count);
-    }
-
-    // Check if function returned non-zero for success or zero for failure.
-    __ cmp(r0, Operand::Zero());
-    BranchOrBacktrack(eq, on_no_match);
-    // On success, increment position by length of capture.
-    __ add(current_input_offset(), current_input_offset(), Operand(r4));
-  }
-
-  __ bind(&fallthrough);
-}
-
-
-void RegExpMacroAssemblerARM::CheckNotBackReference(
-    int start_reg,
-    Label* on_no_match) {
-  Label fallthrough;
-  Label success;
-
-  // Find length of back-referenced capture.
-  __ ldr(r0, register_location(start_reg));
-  __ ldr(r1, register_location(start_reg + 1));
-  __ sub(r1, r1, r0, SetCC);  // Length to check.
-  // Succeed on empty capture (including no capture).
-  __ b(eq, &fallthrough);
-
-  // Check that there are enough characters left in the input.
-  __ cmn(r1, Operand(current_input_offset()));
-  BranchOrBacktrack(gt, on_no_match);
-
-  // Compute pointers to match string and capture string
-  __ add(r0, r0, Operand(end_of_input_address()));
-  __ add(r2, end_of_input_address(), Operand(current_input_offset()));
-  __ add(r1, r1, Operand(r0));
-
-  Label loop;
-  __ bind(&loop);
-  if (mode_ == LATIN1) {
-    __ ldrb(r3, MemOperand(r0, char_size(), PostIndex));
-    __ ldrb(r4, MemOperand(r2, char_size(), PostIndex));
-  } else {
-    DCHECK(mode_ == UC16);
-    __ ldrh(r3, MemOperand(r0, char_size(), PostIndex));
-    __ ldrh(r4, MemOperand(r2, char_size(), PostIndex));
-  }
-  __ cmp(r3, r4);
-  BranchOrBacktrack(ne, on_no_match);
-  __ cmp(r0, r1);
-  __ b(lt, &loop);
-
-  // Move current character position to position after match.
-  __ sub(current_input_offset(), r2, end_of_input_address());
-  __ bind(&fallthrough);
-}
-
-
-void RegExpMacroAssemblerARM::CheckNotCharacter(unsigned c,
-                                                Label* on_not_equal) {
-  __ cmp(current_character(), Operand(c));
-  BranchOrBacktrack(ne, on_not_equal);
-}
-
-
-void RegExpMacroAssemblerARM::CheckCharacterAfterAnd(uint32_t c,
-                                                     uint32_t mask,
-                                                     Label* on_equal) {
-  if (c == 0) {
-    __ tst(current_character(), Operand(mask));
-  } else {
-    __ and_(r0, current_character(), Operand(mask));
-    __ cmp(r0, Operand(c));
-  }
-  BranchOrBacktrack(eq, on_equal);
-}
-
-
-void RegExpMacroAssemblerARM::CheckNotCharacterAfterAnd(unsigned c,
-                                                        unsigned mask,
-                                                        Label* on_not_equal) {
-  if (c == 0) {
-    __ tst(current_character(), Operand(mask));
-  } else {
-    __ and_(r0, current_character(), Operand(mask));
-    __ cmp(r0, Operand(c));
-  }
-  BranchOrBacktrack(ne, on_not_equal);
-}
-
-
-void RegExpMacroAssemblerARM::CheckNotCharacterAfterMinusAnd(
-    uc16 c,
-    uc16 minus,
-    uc16 mask,
-    Label* on_not_equal) {
-  DCHECK(minus < String::kMaxUtf16CodeUnit);
-  __ sub(r0, current_character(), Operand(minus));
-  __ and_(r0, r0, Operand(mask));
-  __ cmp(r0, Operand(c));
-  BranchOrBacktrack(ne, on_not_equal);
-}
-
-
-void RegExpMacroAssemblerARM::CheckCharacterInRange(
-    uc16 from,
-    uc16 to,
-    Label* on_in_range) {
-  __ sub(r0, current_character(), Operand(from));
-  __ cmp(r0, Operand(to - from));
-  BranchOrBacktrack(ls, on_in_range);  // Unsigned lower-or-same condition.
-}
-
-
-void RegExpMacroAssemblerARM::CheckCharacterNotInRange(
-    uc16 from,
-    uc16 to,
-    Label* on_not_in_range) {
-  __ sub(r0, current_character(), Operand(from));
-  __ cmp(r0, Operand(to - from));
-  BranchOrBacktrack(hi, on_not_in_range);  // Unsigned higher condition.
-}
-
-
-void RegExpMacroAssemblerARM::CheckBitInTable(
-    Handle<ByteArray> table,
-    Label* on_bit_set) {
-  __ mov(r0, Operand(table));
-  if (mode_ != LATIN1 || kTableMask != String::kMaxOneByteCharCode) {
-    __ and_(r1, current_character(), Operand(kTableSize - 1));
-    __ add(r1, r1, Operand(ByteArray::kHeaderSize - kHeapObjectTag));
-  } else {
-    __ add(r1,
-           current_character(),
-           Operand(ByteArray::kHeaderSize - kHeapObjectTag));
-  }
-  __ ldrb(r0, MemOperand(r0, r1));
-  __ cmp(r0, Operand::Zero());
-  BranchOrBacktrack(ne, on_bit_set);
-}
-
-
-bool RegExpMacroAssemblerARM::CheckSpecialCharacterClass(uc16 type,
-                                                         Label* on_no_match) {
-  // Range checks (c in min..max) are generally implemented by an unsigned
-  // (c - min) <= (max - min) check
-  switch (type) {
-  case 's':
-    // Match space-characters
-    if (mode_ == LATIN1) {
-      // One byte space characters are '\t'..'\r', ' ' and \u00a0.
-      Label success;
-      __ cmp(current_character(), Operand(' '));
-      __ b(eq, &success);
-      // Check range 0x09..0x0d
-      __ sub(r0, current_character(), Operand('\t'));
-      __ cmp(r0, Operand('\r' - '\t'));
-      __ b(ls, &success);
-      // \u00a0 (NBSP).
-      __ cmp(r0, Operand(0x00a0 - '\t'));
-      BranchOrBacktrack(ne, 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')
-    __ sub(r0, current_character(), Operand('0'));
-    __ cmp(r0, Operand('9' - '0'));
-    BranchOrBacktrack(hi, on_no_match);
-    return true;
-  case 'D':
-    // Match non ASCII-digits
-    __ sub(r0, current_character(), Operand('0'));
-    __ cmp(r0, Operand('9' - '0'));
-    BranchOrBacktrack(ls, on_no_match);
-    return true;
-  case '.': {
-    // Match non-newlines (not 0x0a('\n'), 0x0d('\r'), 0x2028 and 0x2029)
-    __ eor(r0, current_character(), Operand(0x01));
-    // See if current character is '\n'^1 or '\r'^1, i.e., 0x0b or 0x0c
-    __ sub(r0, r0, Operand(0x0b));
-    __ cmp(r0, Operand(0x0c - 0x0b));
-    BranchOrBacktrack(ls, on_no_match);
-    if (mode_ == UC16) {
-      // Compare original value to 0x2028 and 0x2029, using the already
-      // computed (current_char ^ 0x01 - 0x0b). I.e., check for
-      // 0x201d (0x2028 - 0x0b) or 0x201e.
-      __ sub(r0, r0, Operand(0x2028 - 0x0b));
-      __ cmp(r0, Operand(1));
-      BranchOrBacktrack(ls, on_no_match);
-    }
-    return true;
-  }
-  case 'n': {
-    // Match newlines (0x0a('\n'), 0x0d('\r'), 0x2028 and 0x2029)
-    __ eor(r0, current_character(), Operand(0x01));
-    // See if current character is '\n'^1 or '\r'^1, i.e., 0x0b or 0x0c
-    __ sub(r0, r0, Operand(0x0b));
-    __ cmp(r0, Operand(0x0c - 0x0b));
-    if (mode_ == LATIN1) {
-      BranchOrBacktrack(hi, on_no_match);
-    } else {
-      Label done;
-      __ b(ls, &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.
-      __ sub(r0, r0, Operand(0x2028 - 0x0b));
-      __ cmp(r0, Operand(1));
-      BranchOrBacktrack(hi, on_no_match);
-      __ bind(&done);
-    }
-    return true;
-  }
-  case 'w': {
-    if (mode_ != LATIN1) {
-      // Table is 256 entries, so all Latin1 characters can be tested.
-      __ cmp(current_character(), Operand('z'));
-      BranchOrBacktrack(hi, on_no_match);
-    }
-    ExternalReference map = ExternalReference::re_word_character_map();
-    __ mov(r0, Operand(map));
-    __ ldrb(r0, MemOperand(r0, current_character()));
-    __ cmp(r0, Operand::Zero());
-    BranchOrBacktrack(eq, on_no_match);
-    return true;
-  }
-  case 'W': {
-    Label done;
-    if (mode_ != LATIN1) {
-      // Table is 256 entries, so all Latin1 characters can be tested.
-      __ cmp(current_character(), Operand('z'));
-      __ b(hi, &done);
-    }
-    ExternalReference map = ExternalReference::re_word_character_map();
-    __ mov(r0, Operand(map));
-    __ ldrb(r0, MemOperand(r0, current_character()));
-    __ cmp(r0, Operand::Zero());
-    BranchOrBacktrack(ne, 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 RegExpMacroAssemblerARM::Fail() {
-  __ mov(r0, Operand(FAILURE));
-  __ jmp(&exit_label_);
-}
-
-
-Handle<HeapObject> RegExpMacroAssemblerARM::GetCode(Handle<String> source) {
-  Label return_r0;
-  // 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 = r4.bit() | r5.bit() | r6.bit() |
-      r7.bit() | r8.bit() | r9.bit() | r10.bit() | fp.bit();
-  RegList argument_registers = r0.bit() | r1.bit() | r2.bit() | r3.bit();
-  __ stm(db_w, sp, argument_registers | registers_to_retain | lr.bit());
-  // Set frame pointer in space for it if this is not a direct call
-  // from generated code.
-  __ add(frame_pointer(), sp, Operand(4 * kPointerSize));
-  __ mov(r0, Operand::Zero());
-  __ push(r0);  // Make room for success counter and initialize it to 0.
-  __ push(r0);  // Make room for "position - 1" constant (value is 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(isolate());
-  __ mov(r0, Operand(stack_limit));
-  __ ldr(r0, MemOperand(r0));
-  __ sub(r0, sp, r0, SetCC);
-  // Handle it if the stack pointer is already below the stack limit.
-  __ b(ls, &stack_limit_hit);
-  // Check if there is room for the variable number of registers above
-  // the stack limit.
-  __ cmp(r0, Operand(num_registers_ * kPointerSize));
-  __ b(hs, &stack_ok);
-  // Exit with OutOfMemory exception. There is not enough space on the stack
-  // for our working registers.
-  __ mov(r0, Operand(EXCEPTION));
-  __ jmp(&return_r0);
-
-  __ bind(&stack_limit_hit);
-  CallCheckStackGuardState(r0);
-  __ cmp(r0, Operand::Zero());
-  // If returned value is non-zero, we exit with the returned value as result.
-  __ b(ne, &return_r0);
-
-  __ bind(&stack_ok);
-
-  // Allocate space on stack for registers.
-  __ sub(sp, sp, Operand(num_registers_ * kPointerSize));
-  // Load string end.
-  __ ldr(end_of_input_address(), MemOperand(frame_pointer(), kInputEnd));
-  // Load input start.
-  __ ldr(r0, MemOperand(frame_pointer(), kInputStart));
-  // Find negative length (offset of start relative to end).
-  __ sub(current_input_offset(), r0, end_of_input_address());
-  // Set r0 to address of char before start of the input string
-  // (effectively string position -1).
-  __ ldr(r1, MemOperand(frame_pointer(), kStartIndex));
-  __ sub(r0, current_input_offset(), Operand(char_size()));
-  __ sub(r0, r0, Operand(r1, LSL, (mode_ == UC16) ? 1 : 0));
-  // Store this value in a local variable, for use when clearing
-  // position registers.
-  __ str(r0, MemOperand(frame_pointer(), kInputStartMinusOne));
-
-  // Initialize code pointer register
-  __ mov(code_pointer(), Operand(masm_->CodeObject()));
-
-  Label load_char_start_regexp, start_regexp;
-  // Load newline if index is at start, previous character otherwise.
-  __ cmp(r1, Operand::Zero());
-  __ b(ne, &load_char_start_regexp);
-  __ mov(current_character(), Operand('\n'), LeaveCC, eq);
-  __ 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.
-      __ add(r1, frame_pointer(), Operand(kRegisterZero));
-      __ mov(r2, Operand(num_saved_registers_));
-      Label init_loop;
-      __ bind(&init_loop);
-      __ str(r0, MemOperand(r1, kPointerSize, NegPostIndex));
-      __ sub(r2, r2, Operand(1), SetCC);
-      __ b(ne, &init_loop);
-    } else {
-      for (int i = 0; i < num_saved_registers_; i++) {
-        __ str(r0, register_location(i));
-      }
-    }
-  }
-
-  // Initialize backtrack stack pointer.
-  __ ldr(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
-      __ ldr(r1, MemOperand(frame_pointer(), kInputStart));
-      __ ldr(r0, MemOperand(frame_pointer(), kRegisterOutput));
-      __ ldr(r2, MemOperand(frame_pointer(), kStartIndex));
-      __ sub(r1, end_of_input_address(), r1);
-      // r1 is length of input in bytes.
-      if (mode_ == UC16) {
-        __ mov(r1, Operand(r1, LSR, 1));
-      }
-      // r1 is length of input in characters.
-      __ add(r1, r1, Operand(r2));
-      // r1 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) {
-        __ ldr(r2, register_location(i));
-        __ ldr(r3, register_location(i + 1));
-        if (i == 0 && global_with_zero_length_check()) {
-          // Keep capture start in r4 for the zero-length check later.
-          __ mov(r4, r2);
-        }
-        if (mode_ == UC16) {
-          __ add(r2, r1, Operand(r2, ASR, 1));
-          __ add(r3, r1, Operand(r3, ASR, 1));
-        } else {
-          __ add(r2, r1, Operand(r2));
-          __ add(r3, r1, Operand(r3));
-        }
-        __ str(r2, MemOperand(r0, kPointerSize, PostIndex));
-        __ str(r3, MemOperand(r0, kPointerSize, PostIndex));
-      }
-    }
-
-    if (global()) {
-      // Restart matching if the regular expression is flagged as global.
-      __ ldr(r0, MemOperand(frame_pointer(), kSuccessfulCaptures));
-      __ ldr(r1, MemOperand(frame_pointer(), kNumOutputRegisters));
-      __ ldr(r2, MemOperand(frame_pointer(), kRegisterOutput));
-      // Increment success counter.
-      __ add(r0, r0, Operand(1));
-      __ str(r0, 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.
-      __ sub(r1, r1, Operand(num_saved_registers_));
-      // Check whether we have enough room for another set of capture results.
-      __ cmp(r1, Operand(num_saved_registers_));
-      __ b(lt, &return_r0);
-
-      __ str(r1, MemOperand(frame_pointer(), kNumOutputRegisters));
-      // Advance the location for output.
-      __ add(r2, r2, Operand(num_saved_registers_ * kPointerSize));
-      __ str(r2, MemOperand(frame_pointer(), kRegisterOutput));
-
-      // Prepare r0 to initialize registers with its value in the next run.
-      __ ldr(r0, MemOperand(frame_pointer(), kInputStartMinusOne));
-
-      if (global_with_zero_length_check()) {
-        // Special case for zero-length matches.
-        // r4: capture start index
-        __ cmp(current_input_offset(), r4);
-        // Not a zero-length match, restart.
-        __ b(ne, &load_char_start_regexp);
-        // Offset from the end is zero if we already reached the end.
-        __ cmp(current_input_offset(), Operand::Zero());
-        __ b(eq, &exit_label_);
-        // Advance current position after a zero-length match.
-        __ add(current_input_offset(),
-               current_input_offset(),
-               Operand((mode_ == UC16) ? 2 : 1));
-      }
-
-      __ b(&load_char_start_regexp);
-    } else {
-      __ mov(r0, Operand(SUCCESS));
-    }
-  }
-
-  // Exit and return r0
-  __ bind(&exit_label_);
-  if (global()) {
-    __ ldr(r0, MemOperand(frame_pointer(), kSuccessfulCaptures));
-  }
-
-  __ bind(&return_r0);
-  // Skip sp past regexp registers and local variables..
-  __ mov(sp, frame_pointer());
-  // Restore registers r4..r11 and return (restoring lr to pc).
-  __ ldm(ia_w, sp, registers_to_retain | pc.bit());
-
-  // 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_);
-
-    CallCheckStackGuardState(r0);
-    __ cmp(r0, Operand::Zero());
-    // If returning non-zero, we should end execution with the given
-    // result as return value.
-    __ b(ne, &return_r0);
-
-    // String might have moved: Reload end of string from frame.
-    __ ldr(end_of_input_address(), MemOperand(frame_pointer(), 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;
-
-    // Call GrowStack(backtrack_stackpointer(), &stack_base)
-    static const int num_arguments = 3;
-    __ PrepareCallCFunction(num_arguments, r0);
-    __ mov(r0, backtrack_stackpointer());
-    __ add(r1, frame_pointer(), Operand(kStackHighEnd));
-    __ mov(r2, Operand(ExternalReference::isolate_address(isolate())));
-    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.
-    __ cmp(r0, Operand::Zero());
-    __ b(eq, &exit_with_exception);
-    // Otherwise use return value as new stack pointer.
-    __ mov(backtrack_stackpointer(), r0);
-    // Restore saved registers and continue.
-    SafeReturn();
-  }
-
-  if (exit_with_exception.is_linked()) {
-    // If any of the code above needed to exit with an exception.
-    __ bind(&exit_with_exception);
-    // Exit with Result EXCEPTION(-1) to signal thrown exception.
-    __ mov(r0, Operand(EXCEPTION));
-    __ jmp(&return_r0);
-  }
-
-  CodeDesc code_desc;
-  masm_->GetCode(&code_desc);
-  Handle<Code> code = isolate()->factory()->NewCode(
-      code_desc, Code::ComputeFlags(Code::REGEXP), masm_->CodeObject());
-  PROFILE(masm_->isolate(), RegExpCodeCreateEvent(*code, *source));
-  return Handle<HeapObject>::cast(code);
-}
-
-
-void RegExpMacroAssemblerARM::GoTo(Label* to) {
-  BranchOrBacktrack(al, to);
-}
-
-
-void RegExpMacroAssemblerARM::IfRegisterGE(int reg,
-                                           int comparand,
-                                           Label* if_ge) {
-  __ ldr(r0, register_location(reg));
-  __ cmp(r0, Operand(comparand));
-  BranchOrBacktrack(ge, if_ge);
-}
-
-
-void RegExpMacroAssemblerARM::IfRegisterLT(int reg,
-                                           int comparand,
-                                           Label* if_lt) {
-  __ ldr(r0, register_location(reg));
-  __ cmp(r0, Operand(comparand));
-  BranchOrBacktrack(lt, if_lt);
-}
-
-
-void RegExpMacroAssemblerARM::IfRegisterEqPos(int reg,
-                                              Label* if_eq) {
-  __ ldr(r0, register_location(reg));
-  __ cmp(r0, Operand(current_input_offset()));
-  BranchOrBacktrack(eq, if_eq);
-}
-
-
-RegExpMacroAssembler::IrregexpImplementation
-    RegExpMacroAssemblerARM::Implementation() {
-  return kARMImplementation;
-}
-
-
-void RegExpMacroAssemblerARM::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 RegExpMacroAssemblerARM::PopCurrentPosition() {
-  Pop(current_input_offset());
-}
-
-
-void RegExpMacroAssemblerARM::PopRegister(int register_index) {
-  Pop(r0);
-  __ str(r0, register_location(register_index));
-}
-
-
-void RegExpMacroAssemblerARM::PushBacktrack(Label* label) {
-  __ mov_label_offset(r0, label);
-  Push(r0);
-  CheckStackLimit();
-}
-
-
-void RegExpMacroAssemblerARM::PushCurrentPosition() {
-  Push(current_input_offset());
-}
-
-
-void RegExpMacroAssemblerARM::PushRegister(int register_index,
-                                           StackCheckFlag check_stack_limit) {
-  __ ldr(r0, register_location(register_index));
-  Push(r0);
-  if (check_stack_limit) CheckStackLimit();
-}
-
-
-void RegExpMacroAssemblerARM::ReadCurrentPositionFromRegister(int reg) {
-  __ ldr(current_input_offset(), register_location(reg));
-}
-
-
-void RegExpMacroAssemblerARM::ReadStackPointerFromRegister(int reg) {
-  __ ldr(backtrack_stackpointer(), register_location(reg));
-  __ ldr(r0, MemOperand(frame_pointer(), kStackHighEnd));
-  __ add(backtrack_stackpointer(), backtrack_stackpointer(), Operand(r0));
-}
-
-
-void RegExpMacroAssemblerARM::SetCurrentPositionFromEnd(int by) {
-  Label after_position;
-  __ cmp(current_input_offset(), Operand(-by * char_size()));
-  __ b(ge, &after_position);
-  __ mov(current_input_offset(), Operand(-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 RegExpMacroAssemblerARM::SetRegister(int register_index, int to) {
-  DCHECK(register_index >= num_saved_registers_);  // Reserved for positions!
-  __ mov(r0, Operand(to));
-  __ str(r0, register_location(register_index));
-}
-
-
-bool RegExpMacroAssemblerARM::Succeed() {
-  __ jmp(&success_label_);
-  return global();
-}
-
-
-void RegExpMacroAssemblerARM::WriteCurrentPositionToRegister(int reg,
-                                                             int cp_offset) {
-  if (cp_offset == 0) {
-    __ str(current_input_offset(), register_location(reg));
-  } else {
-    __ add(r0, current_input_offset(), Operand(cp_offset * char_size()));
-    __ str(r0, register_location(reg));
-  }
-}
-
-
-void RegExpMacroAssemblerARM::ClearRegisters(int reg_from, int reg_to) {
-  DCHECK(reg_from <= reg_to);
-  __ ldr(r0, MemOperand(frame_pointer(), kInputStartMinusOne));
-  for (int reg = reg_from; reg <= reg_to; reg++) {
-    __ str(r0, register_location(reg));
-  }
-}
-
-
-void RegExpMacroAssemblerARM::WriteStackPointerToRegister(int reg) {
-  __ ldr(r1, MemOperand(frame_pointer(), kStackHighEnd));
-  __ sub(r0, backtrack_stackpointer(), r1);
-  __ str(r0, register_location(reg));
-}
-
-
-// Private methods:
-
-void RegExpMacroAssemblerARM::CallCheckStackGuardState(Register scratch) {
-  __ PrepareCallCFunction(3, scratch);
-
-  // RegExp code frame pointer.
-  __ mov(r2, frame_pointer());
-  // Code* of self.
-  __ mov(r1, Operand(masm_->CodeObject()));
-
-  // We need to make room for the return address on the stack.
-  int stack_alignment = base::OS::ActivationFrameAlignment();
-  DCHECK(IsAligned(stack_alignment, kPointerSize));
-  __ sub(sp, sp, Operand(stack_alignment));
-
-  // r0 will point to the return address, placed by DirectCEntry.
-  __ mov(r0, sp);
-
-  ExternalReference stack_guard_check =
-      ExternalReference::re_check_stack_guard_state(isolate());
-  __ mov(ip, Operand(stack_guard_check));
-  DirectCEntryStub stub(isolate());
-  stub.GenerateCall(masm_, ip);
-
-  // Drop the return address from the stack.
-  __ add(sp, sp, Operand(stack_alignment));
-
-  DCHECK(stack_alignment != 0);
-  __ ldr(sp, MemOperand(sp, 0));
-
-  __ mov(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 RegExpMacroAssemblerARM::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 RegExpMacroAssemblerARM::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 RegExpMacroAssemblerARM::CheckPosition(int cp_offset,
-                                            Label* on_outside_input) {
-  __ cmp(current_input_offset(), Operand(-cp_offset * char_size()));
-  BranchOrBacktrack(ge, on_outside_input);
-}
-
-
-void RegExpMacroAssemblerARM::BranchOrBacktrack(Condition condition,
-                                                Label* to) {
-  if (condition == al) {  // Unconditional.
-    if (to == NULL) {
-      Backtrack();
-      return;
-    }
-    __ jmp(to);
-    return;
-  }
-  if (to == NULL) {
-    __ b(condition, &backtrack_label_);
-    return;
-  }
-  __ b(condition, to);
-}
-
-
-void RegExpMacroAssemblerARM::SafeCall(Label* to, Condition cond) {
-  __ bl(to, cond);
-}
-
-
-void RegExpMacroAssemblerARM::SafeReturn() {
-  __ pop(lr);
-  __ add(pc, lr, Operand(masm_->CodeObject()));
-}
-
-
-void RegExpMacroAssemblerARM::SafeCallTarget(Label* name) {
-  __ bind(name);
-  __ sub(lr, lr, Operand(masm_->CodeObject()));
-  __ push(lr);
-}
-
-
-void RegExpMacroAssemblerARM::Push(Register source) {
-  DCHECK(!source.is(backtrack_stackpointer()));
-  __ str(source,
-         MemOperand(backtrack_stackpointer(), kPointerSize, NegPreIndex));
-}
-
-
-void RegExpMacroAssemblerARM::Pop(Register target) {
-  DCHECK(!target.is(backtrack_stackpointer()));
-  __ ldr(target,
-         MemOperand(backtrack_stackpointer(), kPointerSize, PostIndex));
-}
-
-
-void RegExpMacroAssemblerARM::CheckPreemption() {
-  // Check for preemption.
-  ExternalReference stack_limit =
-      ExternalReference::address_of_stack_limit(isolate());
-  __ mov(r0, Operand(stack_limit));
-  __ ldr(r0, MemOperand(r0));
-  __ cmp(sp, r0);
-  SafeCall(&check_preempt_label_, ls);
-}
-
-
-void RegExpMacroAssemblerARM::CheckStackLimit() {
-  ExternalReference stack_limit =
-      ExternalReference::address_of_regexp_stack_limit(isolate());
-  __ mov(r0, Operand(stack_limit));
-  __ ldr(r0, MemOperand(r0));
-  __ cmp(backtrack_stackpointer(), Operand(r0));
-  SafeCall(&stack_overflow_label_, ls);
-}
-
-
-bool RegExpMacroAssemblerARM::CanReadUnaligned() {
-  return CpuFeatures::IsSupported(UNALIGNED_ACCESSES) && !slow_safe();
-}
-
-
-void RegExpMacroAssemblerARM::LoadCurrentCharacterUnchecked(int cp_offset,
-                                                            int characters) {
-  Register offset = current_input_offset();
-  if (cp_offset != 0) {
-    // r4 is not being used to store the capture start index at this point.
-    __ add(r4, current_input_offset(), Operand(cp_offset * char_size()));
-    offset = r4;
-  }
-  // The ldr, str, ldrh, strh instructions can do unaligned accesses, if the CPU
-  // and the operating system running on the target allow it.
-  // If unaligned load/stores are not supported then this function must only
-  // be used to load a single character at a time.
-  if (!CanReadUnaligned()) {
-    DCHECK(characters == 1);
-  }
-
-  if (mode_ == LATIN1) {
-    if (characters == 4) {
-      __ ldr(current_character(), MemOperand(end_of_input_address(), offset));
-    } else if (characters == 2) {
-      __ ldrh(current_character(), MemOperand(end_of_input_address(), offset));
-    } else {
-      DCHECK(characters == 1);
-      __ ldrb(current_character(), MemOperand(end_of_input_address(), offset));
-    }
-  } else {
-    DCHECK(mode_ == UC16);
-    if (characters == 2) {
-      __ ldr(current_character(), MemOperand(end_of_input_address(), offset));
-    } else {
-      DCHECK(characters == 1);
-      __ ldrh(current_character(), MemOperand(end_of_input_address(), offset));
-    }
-  }
-}
-
-
-#undef __
-
-#endif  // V8_INTERPRETED_REGEXP
-
-}  // namespace internal
-}  // namespace v8
-
-#endif  // V8_TARGET_ARCH_ARM