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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 "V8ValueCache.h"
#include "V8Binding.h"
namespace WebCore {
static v8::Local<v8::String> makeExternalString(const String& string)
{
if (string.is8Bit() && string.containsOnlyASCII()) {
WebCoreStringResource8* stringResource = new WebCoreStringResource8(string);
v8::Local<v8::String> newString = v8::String::NewExternal(stringResource);
if (newString.IsEmpty())
delete stringResource;
return newString;
}
WebCoreStringResource16* stringResource = new WebCoreStringResource16(string);
v8::Local<v8::String> newString = v8::String::NewExternal(stringResource);
if (newString.IsEmpty())
delete stringResource;
return newString;
}
static void cachedStringCallback(v8::Persistent<v8::Value> wrapper, void* parameter)
{
StringImpl* stringImpl = static_cast<StringImpl*>(parameter);
V8PerIsolateData::current()->stringCache()->remove(stringImpl);
wrapper.Dispose();
wrapper.Clear();
stringImpl->deref();
}
void StringCache::remove(StringImpl* stringImpl)
{
ASSERT(m_stringCache.contains(stringImpl));
m_stringCache.remove(stringImpl);
// Make sure that already disposed m_lastV8String is not used in
// StringCache::v8ExternalString().
clearOnGC();
}
v8::Local<v8::String> StringCache::v8ExternalStringSlow(StringImpl* stringImpl, v8::Isolate* isolate)
{
if (!stringImpl->length())
return v8::String::Empty(isolate);
v8::String* cachedV8String = m_stringCache.get(stringImpl);
if (cachedV8String) {
v8::Persistent<v8::String> handle(cachedV8String);
if (handle.IsWeak()) {
m_lastStringImpl = stringImpl;
m_lastV8String = handle;
return v8::Local<v8::String>::New(handle);
}
}
v8::Local<v8::String> newString = makeExternalString(String(stringImpl));
if (newString.IsEmpty())
return newString;
v8::Persistent<v8::String> wrapper = v8::Persistent<v8::String>::New(newString);
if (wrapper.IsEmpty())
return newString;
stringImpl->ref();
wrapper.MarkIndependent();
wrapper.MakeWeak(stringImpl, cachedStringCallback);
m_stringCache.set(stringImpl, *wrapper);
m_lastStringImpl = stringImpl;
m_lastV8String = wrapper;
return newString;
}
void IntegerCache::createSmallIntegers(v8::Isolate* isolate)
{
ASSERT(!m_initialized);
// We initialize m_smallIntegers not in a constructor but in v8Integer(),
// because Integer::New() requires a HandleScope. At the point where
// IntegerCache is constructed, a HandleScope might not exist.
for (int value = 0; value < numberOfCachedSmallIntegers; value++)
m_smallIntegers[value] = v8::Persistent<v8::Integer>::New(v8::Integer::New(value, isolate));
m_initialized = true;
}
IntegerCache::~IntegerCache()
{
if (m_initialized) {
for (int value = 0; value < numberOfCachedSmallIntegers; value++) {
m_smallIntegers[value].Dispose();
m_smallIntegers[value].Clear();
}
m_initialized = false;
}
}
} // namespace WebCore
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