Upgrade V8 to version 4.9.385.28

https://chromium.googlesource.com/v8/v8/+/4.9.385.28

FPIIM-449

Change-Id: I4b2e74289d4bf3667f2f3dc8aa2e541f63e26eb4
diff --git a/src/regexp/arm/regexp-macro-assembler-arm.cc b/src/regexp/arm/regexp-macro-assembler-arm.cc
new file mode 100644
index 0000000..6fafdfb
--- /dev/null
+++ b/src/regexp/arm/regexp-macro-assembler-arm.cc
@@ -0,0 +1,1242 @@
+// 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.
+
+#if V8_TARGET_ARCH_ARM
+
+#include "src/regexp/arm/regexp-macro-assembler-arm.h"
+
+#include "src/code-stubs.h"
+#include "src/log.h"
+#include "src/macro-assembler.h"
+#include "src/profiler/cpu-profiler.h"
+#include "src/regexp/regexp-macro-assembler.h"
+#include "src/regexp/regexp-stack.h"
+#include "src/unicode.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
+ *            string start - 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,
+                               CodeObjectRequired::kYes)),
+      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) {
+  __ ldr(r1, MemOperand(frame_pointer(), kStringStartMinusOne));
+  __ add(r0, current_input_offset(), Operand(-char_size()));
+  __ cmp(r0, r1);
+  BranchOrBacktrack(eq, on_at_start);
+}
+
+
+void RegExpMacroAssemblerARM::CheckNotAtStart(int cp_offset,
+                                              Label* on_not_at_start) {
+  __ ldr(r1, MemOperand(frame_pointer(), kStringStartMinusOne));
+  __ add(r0, current_input_offset(),
+         Operand(-char_size() + cp_offset * char_size()));
+  __ 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, bool read_backward, 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.
+
+  // At this point, the capture registers are either both set or both cleared.
+  // If the capture length is zero, then the capture is either empty or cleared.
+  // Fall through in both cases.
+  __ b(eq, &fallthrough);
+
+  // Check that there are enough characters left in the input.
+  if (read_backward) {
+    __ ldr(r3, MemOperand(frame_pointer(), kStringStartMinusOne));
+    __ add(r3, r3, r1);
+    __ cmp(current_input_offset(), r3);
+    BranchOrBacktrack(le, on_no_match);
+  } else {
+    __ 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, end_of_input_address());
+    __ add(r2, end_of_input_address(), current_input_offset());
+    if (read_backward) {
+      __ sub(r2, r2, r1);  // Offset by length when matching backwards.
+    }
+    __ add(r1, r0, 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());
+    if (read_backward) {
+      __ ldr(r0, register_location(start_reg));  // Index of start of capture
+      __ ldr(r1, register_location(start_reg + 1));  // Index of end of capture
+      __ add(current_input_offset(), current_input_offset(), r0);
+      __ sub(current_input_offset(), current_input_offset(), r1);
+    }
+  } 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(), end_of_input_address());
+    if (read_backward) {
+      __ sub(r1, r1, r4);
+    }
+    // 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, advance position by length of capture.
+    if (read_backward) {
+      __ sub(current_input_offset(), current_input_offset(), r4);
+    } else {
+      __ add(current_input_offset(), current_input_offset(), r4);
+    }
+  }
+
+  __ bind(&fallthrough);
+}
+
+
+void RegExpMacroAssemblerARM::CheckNotBackReference(int start_reg,
+                                                    bool read_backward,
+                                                    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.
+
+  // At this point, the capture registers are either both set or both cleared.
+  // If the capture length is zero, then the capture is either empty or cleared.
+  // Fall through in both cases.
+  __ b(eq, &fallthrough);
+
+  // Check that there are enough characters left in the input.
+  if (read_backward) {
+    __ ldr(r3, MemOperand(frame_pointer(), kStringStartMinusOne));
+    __ add(r3, r3, r1);
+    __ cmp(current_input_offset(), r3);
+    BranchOrBacktrack(lt, on_no_match);
+  } else {
+    __ cmn(r1, Operand(current_input_offset()));
+    BranchOrBacktrack(gt, on_no_match);
+  }
+
+  // r0 - offset of start of capture
+  // r1 - length of capture
+  __ add(r0, r0, end_of_input_address());
+  __ add(r2, end_of_input_address(), current_input_offset());
+  if (read_backward) {
+    __ sub(r2, r2, r1);  // Offset by length when matching backwards.
+  }
+  __ add(r1, r0, r1);
+
+  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());
+  if (read_backward) {
+    __ ldr(r0, register_location(start_reg));      // Index of start of capture
+    __ ldr(r1, register_location(start_reg + 1));  // Index of end of capture
+    __ add(current_input_offset(), current_input_offset(), r0);
+    __ sub(current_input_offset(), current_input_offset(), r1);
+  }
+
+  __ 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 "string start - 1" constant.
+  // Check if we have space on the stack for registers.
+  Label stack_limit_hit;
+  Label stack_ok;
+
+  ExternalReference stack_limit =
+      ExternalReference::address_of_stack_limit(isolate());
+  __ mov(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(), kStringStartMinusOne));
+
+  // 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(), kStringStartMinusOne));
+
+      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<<30));  // Be sane! (And ensure negation works)
+  if (check_bounds) {
+    if (cp_offset >= 0) {
+      CheckPosition(cp_offset + characters - 1, on_end_of_input);
+    } else {
+      CheckPosition(cp_offset, 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(), kStringStartMinusOne));
+  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) {
+  if (cp_offset >= 0) {
+    __ cmp(current_input_offset(), Operand(-cp_offset * char_size()));
+    BranchOrBacktrack(ge, on_outside_input);
+  } else {
+    __ ldr(r1, MemOperand(frame_pointer(), kStringStartMinusOne));
+    __ add(r0, current_input_offset(), Operand(cp_offset * char_size()));
+    __ cmp(r0, r1);
+    BranchOrBacktrack(le, 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