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// Copyright 2009 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "v8.h"
#include "top.h"
#include "regexp-stack.h"
namespace v8 {
namespace internal {
RegExpStack::RegExpStack() {
// Initialize, if not already initialized.
RegExpStack::EnsureCapacity(0);
}
RegExpStack::~RegExpStack() {
// Reset the buffer if it has grown.
RegExpStack::Reset();
}
char* RegExpStack::ArchiveStack(char* to) {
size_t size = sizeof(thread_local_);
memcpy(reinterpret_cast<void*>(to),
&thread_local_,
size);
thread_local_ = ThreadLocal();
return to + size;
}
char* RegExpStack::RestoreStack(char* from) {
size_t size = sizeof(thread_local_);
memcpy(&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 (thread_local_.memory_size_ > 0) {
DeleteArray(thread_local_.memory_);
thread_local_ = ThreadLocal();
}
}
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>(size);
if (thread_local_.memory_size_ > 0) {
// Copy original memory into top of new memory.
memcpy(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_;
}
RegExpStack::ThreadLocal RegExpStack::thread_local_;
}} // namespace v8::internal
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