Move regexp implementation into its own folder.

src/regexp-stack.cc

-// Copyright 2009 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"
-
-#include "src/regexp-stack.h"
-
-namespace v8 {
-namespace internal {
-
-RegExpStackScope::RegExpStackScope(Isolate* isolate)
-    : regexp_stack_(isolate->regexp_stack()) {
-  // Initialize, if not already initialized.
-  regexp_stack_->EnsureCapacity(0);
-}
-
-
-RegExpStackScope::~RegExpStackScope() {
-  // Reset the buffer if it has grown.
-  regexp_stack_->Reset();
-}
-
-
-RegExpStack::RegExpStack()
-    : isolate_(NULL) {
-}
-
-
-RegExpStack::~RegExpStack() {
-  thread_local_.Free();
-}
-
-
-char* RegExpStack::ArchiveStack(char* to) {
-  size_t size = sizeof(thread_local_);
-  MemCopy(reinterpret_cast<void*>(to), &thread_local_, size);
-  thread_local_ = ThreadLocal();
-  return to + size;
-}
-
-
-char* RegExpStack::RestoreStack(char* from) {
-  size_t size = sizeof(thread_local_);
-  MemCopy(&thread_local_, reinterpret_cast<void*>(from), size);
-  return from + size;
-}
-
-
-void RegExpStack::Reset() {
-  if (thread_local_.memory_size_ > kMinimumStackSize) {
-    DeleteArray(thread_local_.memory_);
-    thread_local_ = ThreadLocal();
-  }
-}
-
-
-void RegExpStack::ThreadLocal::Free() {
-  if (memory_size_ > 0) {
-    DeleteArray(memory_);
-    Clear();
-  }
-}
-
-
-Address RegExpStack::EnsureCapacity(size_t size) {
-  if (size > kMaximumStackSize) return NULL;
-  if (size < kMinimumStackSize) size = kMinimumStackSize;
-  if (thread_local_.memory_size_ < size) {
-    Address new_memory = NewArray<byte>(static_cast<int>(size));
-    if (thread_local_.memory_size_ > 0) {
-      // Copy original memory into top of new memory.
-      MemCopy(reinterpret_cast<void*>(new_memory + size -
-                                      thread_local_.memory_size_),
-              reinterpret_cast<void*>(thread_local_.memory_),
-              thread_local_.memory_size_);
-      DeleteArray(thread_local_.memory_);
-    }
-    thread_local_.memory_ = new_memory;
-    thread_local_.memory_size_ = size;
-    thread_local_.limit_ = new_memory + kStackLimitSlack * kPointerSize;
-  }
-  return thread_local_.memory_ + thread_local_.memory_size_;
-}
-
-
-}  // namespace internal
-}  // namespace v8