/* | |
* Copyright (C) 2008, 2009 Apple 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. | |
* 3. Neither the name of Apple Computer, Inc. ("Apple") 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 APPLE 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 OR ITS CONTRIBUTORS BE LIABLE FOR ANY | |
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*/ | |
#ifndef EvalCodeCache_h | |
#define EvalCodeCache_h | |
#include "Executable.h" | |
#include "JSGlobalObject.h" | |
#include "Nodes.h" | |
#include "Parser.h" | |
#include "SourceCode.h" | |
#include "UString.h" | |
#include <wtf/HashMap.h> | |
#include <wtf/RefPtr.h> | |
namespace JSC { | |
class EvalCodeCache { | |
public: | |
PassRefPtr<EvalExecutable> get(ExecState* exec, const UString& evalSource, ScopeChainNode* scopeChain, JSValue& exceptionValue) | |
{ | |
RefPtr<EvalExecutable> evalExecutable; | |
if (evalSource.size() < maxCacheableSourceLength && (*scopeChain->begin())->isVariableObject()) | |
evalExecutable = m_cacheMap.get(evalSource.rep()); | |
if (!evalExecutable) { | |
evalExecutable = EvalExecutable::create(exec, makeSource(evalSource)); | |
exceptionValue = evalExecutable->compile(exec, scopeChain); | |
if (exceptionValue) | |
return 0; | |
if (evalSource.size() < maxCacheableSourceLength && (*scopeChain->begin())->isVariableObject() && m_cacheMap.size() < maxCacheEntries) | |
m_cacheMap.set(evalSource.rep(), evalExecutable); | |
} | |
return evalExecutable.release(); | |
} | |
bool isEmpty() const { return m_cacheMap.isEmpty(); } | |
private: | |
static const int maxCacheableSourceLength = 256; | |
static const int maxCacheEntries = 64; | |
typedef HashMap<RefPtr<UString::Rep>, RefPtr<EvalExecutable> > EvalCacheMap; | |
EvalCacheMap m_cacheMap; | |
}; | |
} // namespace JSC | |
#endif // EvalCodeCache_h |