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/*
* Copyright (C) 2012 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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
* 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 CodeCache_h
#define CodeCache_h
#include "CodeSpecializationKind.h"
#include "ParserModes.h"
#include "Strong.h"
#include "WeakRandom.h"
#include <wtf/FixedArray.h>
#include <wtf/Forward.h>
#include <wtf/PassOwnPtr.h>
#include <wtf/RandomNumber.h>
#include <wtf/text/WTFString.h>
namespace JSC {
class EvalExecutable;
class Identifier;
class ProgramExecutable;
class UnlinkedCodeBlock;
class UnlinkedEvalCodeBlock;
class UnlinkedFunctionCodeBlock;
class UnlinkedFunctionExecutable;
class UnlinkedProgramCodeBlock;
class JSGlobalData;
struct ParserError;
class SourceCode;
class SourceProvider;
template <typename KeyType, typename EntryType, int CacheSize> class CacheMap {
typedef typename HashMap<KeyType, unsigned>::iterator iterator;
public:
CacheMap()
: m_randomGenerator((static_cast<uint32_t>(randomNumber() * std::numeric_limits<uint32_t>::max())))
{
}
const EntryType* find(const KeyType& key)
{
iterator result = m_map.find(key);
if (result == m_map.end())
return 0;
return &m_data[result->value].second;
}
void add(const KeyType& key, const EntryType& value)
{
iterator result = m_map.find(key);
if (result != m_map.end()) {
m_data[result->value].second = value;
return;
}
size_t newIndex = m_randomGenerator.getUint32() % CacheSize;
if (m_data[newIndex].second)
m_map.remove(m_data[newIndex].first);
m_map.add(key, newIndex);
m_data[newIndex].first = key;
m_data[newIndex].second = value;
ASSERT(m_map.size() <= CacheSize);
}
private:
HashMap<KeyType, unsigned> m_map;
FixedArray<std::pair<KeyType, EntryType>, CacheSize> m_data;
WeakRandom m_randomGenerator;
};
class CodeCache {
public:
static PassOwnPtr<CodeCache> create() { return adoptPtr(new CodeCache); }
UnlinkedProgramCodeBlock* getProgramCodeBlock(JSGlobalData&, ProgramExecutable*, const SourceCode&, JSParserStrictness, DebuggerMode, ProfilerMode, ParserError&);
UnlinkedEvalCodeBlock* getEvalCodeBlock(JSGlobalData&, EvalExecutable*, const SourceCode&, JSParserStrictness, DebuggerMode, ProfilerMode, ParserError&);
UnlinkedFunctionCodeBlock* getFunctionCodeBlock(JSGlobalData&, UnlinkedFunctionExecutable*, const SourceCode&, CodeSpecializationKind, DebuggerMode, ProfilerMode, ParserError&);
UnlinkedFunctionExecutable* getFunctionExecutableFromGlobalCode(JSGlobalData&, const Identifier&, const SourceCode&, ParserError&);
void usedFunctionCode(JSGlobalData&, UnlinkedFunctionCodeBlock*);
~CodeCache();
enum CodeType { EvalType, ProgramType, FunctionType };
typedef std::pair<String, unsigned> CodeBlockKey;
typedef std::pair<String, String> GlobalFunctionKey;
private:
CodeCache();
UnlinkedFunctionCodeBlock* generateFunctionCodeBlock(JSGlobalData&, UnlinkedFunctionExecutable*, const SourceCode&, CodeSpecializationKind, DebuggerMode, ProfilerMode, ParserError&);
template <class UnlinkedCodeBlockType, class ExecutableType> inline UnlinkedCodeBlockType* getCodeBlock(JSGlobalData&, ExecutableType*, const SourceCode&, JSParserStrictness, DebuggerMode, ProfilerMode, ParserError&);
CodeBlockKey makeCodeBlockKey(const SourceCode&, CodeType, JSParserStrictness);
GlobalFunctionKey makeGlobalFunctionKey(const SourceCode&, const String&);
enum {
kMaxCodeBlockEntries = 1024,
kMaxGlobalFunctionEntries = 1024,
kMaxFunctionCodeBlocks = 1024
};
CacheMap<CodeBlockKey, Strong<UnlinkedCodeBlock>, kMaxCodeBlockEntries> m_cachedCodeBlocks;
CacheMap<GlobalFunctionKey, Strong<UnlinkedFunctionExecutable>, kMaxGlobalFunctionEntries> m_cachedGlobalFunctions;
CacheMap<UnlinkedFunctionCodeBlock*, Strong<UnlinkedFunctionCodeBlock>, kMaxFunctionCodeBlocks> m_cachedFunctionCode;
};
}
#endif
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