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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.
*/
#ifndef V8ValueCache_h
#define V8ValueCache_h
#include <v8.h>
#include <wtf/HashMap.h>
#include <wtf/RefPtr.h>
#include <wtf/text/AtomicString.h>
#include <wtf/text/WTFString.h>
namespace WebCore {
class StringCache {
public:
StringCache() { }
v8::Local<v8::String> v8ExternalString(StringImpl* stringImpl, v8::Isolate* isolate)
{
if (m_lastStringImpl.get() == stringImpl && m_lastV8String.IsWeak())
return v8::Local<v8::String>::New(m_lastV8String);
return v8ExternalStringSlow(stringImpl, isolate);
}
void clearOnGC()
{
m_lastStringImpl = 0;
m_lastV8String.Clear();
}
void remove(StringImpl*);
void reportMemoryUsage(MemoryObjectInfo*) const;
private:
v8::Local<v8::String> v8ExternalStringSlow(StringImpl*, v8::Isolate*);
HashMap<StringImpl*, v8::String*> m_stringCache;
v8::Persistent<v8::String> m_lastV8String;
// Note: RefPtr is a must as we cache by StringImpl* equality, not identity
// hence lastStringImpl might be not a key of the cache (in sense of identity)
// and hence it's not refed on addition.
RefPtr<StringImpl> m_lastStringImpl;
};
const int numberOfCachedSmallIntegers = 64;
class IntegerCache {
public:
IntegerCache() : m_initialized(false) { };
~IntegerCache();
v8::Handle<v8::Integer> v8Integer(int value, v8::Isolate* isolate)
{
if (!m_initialized)
createSmallIntegers(isolate);
if (0 <= value && value < numberOfCachedSmallIntegers)
return m_smallIntegers[value];
return v8::Integer::New(value, isolate);
}
v8::Handle<v8::Integer> v8UnsignedInteger(unsigned value, v8::Isolate* isolate)
{
if (!m_initialized)
createSmallIntegers(isolate);
if (value < static_cast<unsigned>(numberOfCachedSmallIntegers))
return m_smallIntegers[value];
return v8::Integer::NewFromUnsigned(value, isolate);
}
private:
void createSmallIntegers(v8::Isolate*);
v8::Persistent<v8::Integer> m_smallIntegers[numberOfCachedSmallIntegers];
bool m_initialized;
};
} // namespace WebCore
#endif // V8ValueCache_h
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