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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.
*/
#include "config.h"
#include "CodeCache.h"
#include "BytecodeGenerator.h"
#include "CodeSpecializationKind.h"
#include "Parser.h"
#include "StrongInlines.h"
#include "UnlinkedCodeBlock.h"
namespace JSC {
CodeCache::CodeCache()
: m_randomGenerator(static_cast<uint32_t>(randomNumber() * UINT32_MAX))
{
}
CodeCache::~CodeCache()
{
}
CodeCache::CodeBlockKey CodeCache::makeCodeBlockKey(const SourceCode& source, CodeCache::CodeType type, JSParserStrictness strictness)
{
return std::make_pair(source.toString(), (type << 1) | strictness);
}
template <typename T> struct CacheTypes { };
template <> struct CacheTypes<UnlinkedProgramCodeBlock> {
typedef JSC::ProgramNode RootNode;
static const CodeCache::CodeType codeType = CodeCache::ProgramType;
};
template <> struct CacheTypes<UnlinkedEvalCodeBlock> {
typedef JSC::EvalNode RootNode;
static const CodeCache::CodeType codeType = CodeCache::EvalType;
};
template <class UnlinkedCodeBlockType, class ExecutableType>
UnlinkedCodeBlockType* CodeCache::getCodeBlock(JSGlobalData& globalData, ExecutableType* executable, const SourceCode& source, JSParserStrictness strictness, DebuggerMode debuggerMode, ProfilerMode profilerMode, ParserError& error)
{
CodeBlockKey key = makeCodeBlockKey(source, CacheTypes<UnlinkedCodeBlockType>::codeType, strictness);
bool storeInCache = false;
if (debuggerMode == DebuggerOff && profilerMode == ProfilerOff) {
CodeBlockIndicesMap::iterator result = m_cachedCodeBlockIndices.find(key);
if (result != m_cachedCodeBlockIndices.end()) {
UnlinkedCodeBlockType* unlinkedCode = jsCast<UnlinkedCodeBlockType*>(m_cachedCodeBlocks[result->value].second.get());
unsigned firstLine = source.firstLine() + unlinkedCode->firstLine();
executable->recordParse(unlinkedCode->codeFeatures(), unlinkedCode->hasCapturedVariables(), firstLine, firstLine + unlinkedCode->lineCount());
return unlinkedCode;
}
storeInCache = true;
}
typedef typename CacheTypes<UnlinkedCodeBlockType>::RootNode RootNode;
RefPtr<RootNode> rootNode = parse<RootNode>(&globalData, source, 0, Identifier(), strictness, JSParseProgramCode, error);
if (!rootNode)
return 0;
executable->recordParse(rootNode->features(), rootNode->hasCapturedVariables(), rootNode->lineNo(), rootNode->lastLine());
UnlinkedCodeBlockType* unlinkedCode = UnlinkedCodeBlockType::create(&globalData, executable->executableInfo());
unlinkedCode->recordParse(rootNode->features(), rootNode->hasCapturedVariables(), rootNode->lineNo() - source.firstLine(), rootNode->lastLine() - rootNode->lineNo());
OwnPtr<BytecodeGenerator> generator(adoptPtr(new BytecodeGenerator(globalData, rootNode.get(), unlinkedCode, debuggerMode, profilerMode)));
error = generator->generate();
rootNode->destroyData();
if (error.m_type != ParserError::ErrorNone)
return 0;
if (storeInCache) {
size_t index = m_randomGenerator.getUint32() % kMaxCodeBlockEntries;
if (m_cachedCodeBlocks[index].second)
m_cachedCodeBlockIndices.remove(m_cachedCodeBlocks[index].first);
m_cachedCodeBlockIndices.set(key, index);
m_cachedCodeBlocks[index].second.set(globalData, unlinkedCode);
m_cachedCodeBlocks[index].first = key;
}
return unlinkedCode;
}
UnlinkedProgramCodeBlock* CodeCache::getProgramCodeBlock(JSGlobalData& globalData, ProgramExecutable* executable, const SourceCode& source, JSParserStrictness strictness, DebuggerMode debuggerMode, ProfilerMode profilerMode, ParserError& error)
{
return getCodeBlock<UnlinkedProgramCodeBlock>(globalData, executable, source, strictness, debuggerMode, profilerMode, error);
}
UnlinkedEvalCodeBlock* CodeCache::getEvalCodeBlock(JSGlobalData& globalData, EvalExecutable* executable, const SourceCode& source, JSParserStrictness strictness, DebuggerMode debuggerMode, ProfilerMode profilerMode, ParserError& error)
{
return getCodeBlock<UnlinkedEvalCodeBlock>(globalData, executable, source, strictness, debuggerMode, profilerMode, error);
}
UnlinkedFunctionCodeBlock* CodeCache::generateFunctionCodeBlock(JSGlobalData& globalData, UnlinkedFunctionExecutable* executable, const SourceCode& source, CodeSpecializationKind kind, DebuggerMode debuggerMode, ProfilerMode profilerMode, ParserError& error)
{
RefPtr<FunctionBodyNode> body = parse<FunctionBodyNode>(&globalData, source, executable->parameters(), executable->name(), executable->isInStrictContext() ? JSParseStrict : JSParseNormal, JSParseFunctionCode, error);
if (!body) {
ASSERT(error.m_type != ParserError::ErrorNone);
return 0;
}
if (executable->forceUsesArguments())
body->setUsesArguments();
body->finishParsing(executable->parameters(), executable->name(), executable->functionNameIsInScopeToggle());
executable->recordParse(body->features(), body->hasCapturedVariables(), body->lineNo(), body->lastLine());
UnlinkedFunctionCodeBlock* result = UnlinkedFunctionCodeBlock::create(&globalData, FunctionCode, ExecutableInfo(body->needsActivation(), body->usesEval(), body->isStrictMode(), kind == CodeForConstruct));
OwnPtr<BytecodeGenerator> generator(adoptPtr(new BytecodeGenerator(globalData, body.get(), result, debuggerMode, profilerMode)));
error = generator->generate();
body->destroyData();
if (error.m_type != ParserError::ErrorNone)
return 0;
return result;
}
UnlinkedFunctionCodeBlock* CodeCache::getFunctionCodeBlock(JSGlobalData& globalData, UnlinkedFunctionExecutable* executable, const SourceCode& source, CodeSpecializationKind kind, DebuggerMode debuggerMode, ProfilerMode profilerMode, ParserError& error)
{
return generateFunctionCodeBlock(globalData, executable, source, kind, debuggerMode, profilerMode, error);
}
CodeCache::GlobalFunctionKey CodeCache::makeGlobalFunctionKey(const SourceCode& source, const String& name)
{
return GlobalFunctionKey(source.toString(), name);
}
UnlinkedFunctionExecutable* CodeCache::getFunctionExecutableFromGlobalCode(JSGlobalData& globalData, const Identifier& name, const SourceCode& source, ParserError& error)
{
GlobalFunctionKey key = makeGlobalFunctionKey(source, name.string());
GlobalFunctionIndicesMap::iterator result = m_cachedGlobalFunctionIndices.find(key);
if (result != m_cachedGlobalFunctionIndices.end())
return m_cachedGlobalFunctions[result->value].second.get();
RefPtr<ProgramNode> program = parse<ProgramNode>(&globalData, source, 0, Identifier(), JSParseNormal, JSParseProgramCode, error);
if (!program) {
ASSERT(error.m_type != ParserError::ErrorNone);
return 0;
}
// This function assumes an input string that would result in a single anonymous function expression.
StatementNode* exprStatement = program->singleStatement();
ASSERT(exprStatement);
ASSERT(exprStatement->isExprStatement());
ExpressionNode* funcExpr = static_cast<ExprStatementNode*>(exprStatement)->expr();
ASSERT(funcExpr);
ASSERT(funcExpr->isFuncExprNode());
FunctionBodyNode* body = static_cast<FuncExprNode*>(funcExpr)->body();
ASSERT(body);
ASSERT(body->ident().isNull());
UnlinkedFunctionExecutable* functionExecutable = UnlinkedFunctionExecutable::create(&globalData, source, body);
functionExecutable->m_nameValue.set(globalData, functionExecutable, jsString(&globalData, name.string()));
size_t index = m_randomGenerator.getUint32() % kMaxGlobalFunctionEntries;
if (m_cachedGlobalFunctions[index].second)
m_cachedGlobalFunctionIndices.remove(m_cachedGlobalFunctions[index].first);
m_cachedGlobalFunctionIndices.set(key, index);
m_cachedGlobalFunctions[index].second.set(globalData, functionExecutable);
m_cachedGlobalFunctions[index].first = key;
return functionExecutable;
}
}
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