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	1	/*
	2	* Copyright (C) 2008, 2009 Apple Inc. All rights reserved.
	3	*
	4	* Redistribution and use in source and binary forms, with or without
	5	* modification, are permitted provided that the following conditions
	6	* are met:
	7	*
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer.
	10	* 2. Redistributions in binary form must reproduce the above copyright
	11	* notice, this list of conditions and the following disclaimer in the
	12	* documentation and/or other materials provided with the distribution.
	13	* 3. Neither the name of Apple Inc. ("Apple") nor the names of
	14	* its contributors may be used to endorse or promote products derived
	15	* from this software without specific prior written permission.
	16	*
	17	* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
	18	* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
	19	* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
	20	* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
	21	* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
	22	* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
	23	* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
	24	* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	27	*/
	28
	29	#ifndef EvalCodeCache_h
	30	#define EvalCodeCache_h
	31
	32	#include "Executable.h"
	33	#include "JSGlobalObject.h"
	34	#include "Options.h"
	35	#include "SourceCode.h"
	36	#include <wtf/HashMap.h>
	37	#include <wtf/RefPtr.h>
	38	#include <wtf/text/StringHash.h>
	39
	40	namespace JSC {
	41
	42	class SlotVisitor;
	43
	44	class EvalCodeCache {
	45	public:
	46	EvalExecutable* tryGet(bool inStrictContext, const String& evalSource, JSScope* scope)
	47	{
	48	if (!inStrictContext && evalSource.length() < Options::maximumEvalCacheableSourceLength() && scope->begin()->isVariableObject())
	49	return m_cacheMap.get(evalSource.impl()).get();
	50	return 0;
	51	}
	52
	53	EvalExecutable* getSlow(ExecState* exec, ScriptExecutable* owner, bool inStrictContext, ThisTDZMode thisTDZMode, const String& evalSource, JSScope* scope)
	54	{
	55	EvalExecutable* evalExecutable = EvalExecutable::create(exec, makeSource(evalSource), inStrictContext, thisTDZMode);
	56	if (!evalExecutable)
	57	return 0;
	58
	59	if (!inStrictContext && evalSource.length() < Options::maximumEvalCacheableSourceLength() && scope->begin()->isVariableObject() && m_cacheMap.size() < maxCacheEntries)
	60	m_cacheMap.set(evalSource.impl(), WriteBarrier<EvalExecutable>(exec->vm(), owner, evalExecutable));
	61
	62	return evalExecutable;
	63	}
	64
	65	bool isEmpty() const { return m_cacheMap.isEmpty(); }
	66
	67	void visitAggregate(SlotVisitor&);
	68
	69	void clear()
	70	{
	71	m_cacheMap.clear();
	72	}
	73
	74	private:
	75	static const int maxCacheEntries = 64;
	76
	77	typedef HashMap<RefPtr<StringImpl>, WriteBarrier<EvalExecutable>> EvalCacheMap;
	78	EvalCacheMap m_cacheMap;
	79	};
	80
	81	} // namespace JSC
	82
	83	#endif // EvalCodeCache_h