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/*
* Copyright (C) 2009 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS 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 "config.h"
#include "bindings/core/v8/V8ValueCache.h"
#include "bindings/core/v8/V8Binding.h"
#include "wtf/text/StringHash.h"
namespace blink {
StringCacheMapTraits::MapType* StringCacheMapTraits::MapFromWeakCallbackData(
const v8::WeakCallbackData<v8::String, WeakCallbackDataType>& data)
{
return &(V8PerIsolateData::from(data.GetIsolate())->stringCache()->m_stringCache);
}
void StringCacheMapTraits::Dispose(
v8::Isolate* isolate, v8::UniquePersistent<v8::String> value, StringImpl* key)
{
V8PerIsolateData::from(isolate)->stringCache()->InvalidateLastString();
key->deref();
}
StringCache::~StringCache()
{
// The MapType::Dispose callback calls StringCache::InvalidateLastString,
// which will only work while the destructor has not yet finished. Thus,
// we need to clear the map before the destructor has completed.
m_stringCache.Clear();
}
static v8::Local<v8::String> makeExternalString(const String& string, v8::Isolate* isolate)
{
if (string.is8Bit()) {
WebCoreStringResource8* stringResource = new WebCoreStringResource8(string);
v8::Local<v8::String> newString = v8::String::NewExternal(isolate, stringResource);
if (newString.IsEmpty())
delete stringResource;
return newString;
}
WebCoreStringResource16* stringResource = new WebCoreStringResource16(string);
v8::Local<v8::String> newString = v8::String::NewExternal(isolate, stringResource);
if (newString.IsEmpty())
delete stringResource;
return newString;
}
v8::Handle<v8::String> StringCache::v8ExternalStringSlow(v8::Isolate* isolate, StringImpl* stringImpl)
{
if (!stringImpl->length())
return v8::String::Empty(isolate);
StringCacheMapTraits::MapType::PersistentValueReference cachedV8String = m_stringCache.GetReference(stringImpl);
if (!cachedV8String.IsEmpty()) {
m_lastStringImpl = stringImpl;
m_lastV8String = cachedV8String;
return m_lastV8String.NewLocal(isolate);
}
return createStringAndInsertIntoCache(isolate, stringImpl);
}
void StringCache::setReturnValueFromStringSlow(v8::ReturnValue<v8::Value> returnValue, StringImpl* stringImpl)
{
if (!stringImpl->length()) {
returnValue.SetEmptyString();
return;
}
StringCacheMapTraits::MapType::PersistentValueReference cachedV8String = m_stringCache.GetReference(stringImpl);
if (!cachedV8String.IsEmpty()) {
m_lastStringImpl = stringImpl;
m_lastV8String = cachedV8String;
m_lastV8String.SetReturnValue(returnValue);
return;
}
returnValue.Set(createStringAndInsertIntoCache(returnValue.GetIsolate(), stringImpl));
}
v8::Local<v8::String> StringCache::createStringAndInsertIntoCache(v8::Isolate* isolate, StringImpl* stringImpl)
{
ASSERT(!m_stringCache.Contains(stringImpl));
ASSERT(stringImpl->length());
v8::Local<v8::String> newString = makeExternalString(String(stringImpl), isolate);
if (newString.IsEmpty())
return newString;
v8::UniquePersistent<v8::String> wrapper(isolate, newString);
stringImpl->ref();
wrapper.MarkIndependent();
m_stringCache.Set(stringImpl, wrapper.Pass(), &m_lastV8String);
m_lastStringImpl = stringImpl;
return newString;
}
void StringCache::InvalidateLastString()
{
m_lastStringImpl = nullptr;
m_lastV8String.Reset();
}
} // namespace blink
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