Register* JSStack::highAddress() const
{
ASSERT(wtfThreadData().stack().isGrowingDownward());
return reinterpret_cast<Register*>(wtfThreadData().stack().origin());
}
void Heap::collect(SweepToggle sweepToggle)
{
SamplingRegion samplingRegion("Garbage Collection");
GCPHASE(Collect);
ASSERT(globalData()->identifierTable == wtfThreadData().currentIdentifierTable());
ASSERT(m_isSafeToCollect);
JAVASCRIPTCORE_GC_BEGIN();
m_activityCallback->willCollect();
double lastGCStartTime = WTF::currentTime();
if (lastGCStartTime - m_lastCodeDiscardTime > minute) {
discardAllCompiledCode();
m_lastCodeDiscardTime = WTF::currentTime();
}
#if ENABLE(GGC)
bool fullGC = sweepToggle == DoSweep;
if (!fullGC)
fullGC = (capacity() > 4 * m_sizeAfterLastCollect);
#else
bool fullGC = true;
#endif
{
GCPHASE(Canonicalize);
canonicalizeCellLivenessData();
}
markRoots(fullGC);
{
GCPHASE(FinalizeUnconditionalFinalizers);
finalizeUnconditionalFinalizers();
}
{
GCPHASE(FinalizeWeakHandles);
m_weakSet.sweep();
m_globalData->smallStrings.finalizeSmallStrings();
}
JAVASCRIPTCORE_GC_MARKED();
{
GCPHASE(ResetAllocator);
resetAllocators();
}
{
GCPHASE(DeleteCodeBlocks);
m_dfgCodeBlocks.deleteUnmarkedJettisonedCodeBlocks();
}
if (sweepToggle == DoSweep) {
SamplingRegion samplingRegion("Garbage Collection: Sweeping");
GCPHASE(Sweeping);
sweep();
m_objectSpace.shrink();
m_weakSet.shrink();
}
// To avoid pathological GC churn in large heaps, we set the new allocation
// limit to be the current size of the heap. This heuristic
// is a bit arbitrary. Using the current size of the heap after this
// collection gives us a 2X multiplier, which is a 1:1 (heap size :
// new bytes allocated) proportion, and seems to work well in benchmarks.
size_t newSize = size();
if (fullGC) {
m_sizeAfterLastCollect = newSize;
m_bytesAllocatedLimit = max(newSize, m_minBytesPerCycle);
}
m_bytesAllocated = 0;
double lastGCEndTime = WTF::currentTime();
m_lastGCLength = lastGCEndTime - lastGCStartTime;
JAVASCRIPTCORE_GC_END();
}
Register* JSStack::lowAddress() const
{
ASSERT(wtfThreadData().stack().isGrowingDownward());
return reinterpret_cast<Register*>(m_vm.stackLimit());
}
JSGlueAPICallback::~JSGlueAPICallback()
{
wtfThreadData().setCurrentIdentifierTable(getThreadGlobalData()->identifierTable);
}
StackStats::LayoutCheckPoint::LayoutCheckPoint()
{
// While a layout checkpoint is not necessarily a checkpoint where we
// we will do a recursion check, it is a convenient spot for doing a
// probe to measure the height of stack usage.
//
// We'll do this probe before we commence with the layout checkpoint.
// This is because the probe also locks the sharedLock. By calling the
// probe first, we can avoid re-entering the lock.
StackStats::probe();
MutexLocker locker(*StackStats::s_sharedLock);
WTFThreadData* threadData = const_cast<WTFThreadData*>(&wtfThreadData());
StackStats::PerThreadStats& t = threadData->stackStats();
const StackBounds& stack = threadData->stack();
// Push this checkpoint:
m_prev = StackStats::s_topLayoutCheckPoint;
if (m_prev)
m_depth = m_prev->m_depth + 1;
else {
StackStats::s_firstLayoutCheckPoint = this;
m_depth = 0;
}
StackStats::s_topLayoutCheckPoint = this;
//
char* current = reinterpret_cast<char*>(this);
char* last = reinterpret_cast<char*>(m_prev);
char* root = reinterpret_cast<char*>(StackStats::s_firstLayoutCheckPoint);
bool needToLog = false;
int diff = last - current;
if (!last)
diff = 0;
int totalDiff = root - current;
if (!root)
totalDiff = 0;
// Update the stack height stats:
int height = t.m_stackStart - current;
if (height > StackStats::s_maxStackHeight) {
StackStats::s_maxStackHeight = height;
needToLog = true;
}
// Update the layout checkpoint diff stats:
if (diff > StackStats::s_maxLayoutCheckPointDiff) {
StackStats::s_maxLayoutCheckPointDiff = diff;
needToLog = true;
}
// Update the total layout checkpoint diff stats:
if (totalDiff > StackStats::s_maxTotalLayoutCheckPointDiff) {
StackStats::s_maxTotalLayoutCheckPointDiff = totalDiff;
needToLog = true;
}
#if ENABLE(VERBOSE_STACK_STATS)
needToLog = true; // always log.
#endif
if (needToLog)
dataLogF(" LAYOUT %p diff %d/%.1fk/max %.1fk | reentry %d/max %d | height %.1fk/max %.1fk | stack %p size %.1fk\n",
current, diff, diff / 1024.0, StackStats::s_maxLayoutCheckPointDiff / 1024.0,
m_depth, StackStats::s_maxLayoutReentryDepth,
totalDiff / 1024.0, StackStats::s_maxTotalLayoutCheckPointDiff / 1024.0,
stack.origin(), stack.size() / 1024.0);
}
void Heap::collect(SweepToggle sweepToggle)
{
#if ENABLE(ALLOCATION_LOGGING)
dataLogF("JSC GC starting collection.\n");
#endif
double before = 0;
if (Options::logGC()) {
dataLog("[GC", sweepToggle == DoSweep ? " (eager sweep)" : "", ": ");
before = currentTimeMS();
}
SamplingRegion samplingRegion("Garbage Collection");
RELEASE_ASSERT(!m_deferralDepth);
GCPHASE(Collect);
ASSERT(vm()->currentThreadIsHoldingAPILock());
RELEASE_ASSERT(vm()->identifierTable == wtfThreadData().currentIdentifierTable());
ASSERT(m_isSafeToCollect);
JAVASCRIPTCORE_GC_BEGIN();
RELEASE_ASSERT(m_operationInProgress == NoOperation);
m_deferralDepth++; // Make sure that we don't GC in this call.
m_vm->prepareToDiscardCode();
m_deferralDepth--; // Decrement deferal manually, so we don't GC when we do so, since we are already GCing!.
m_operationInProgress = Collection;
m_extraMemoryUsage = 0;
m_activityCallback->willCollect();
double lastGCStartTime = WTF::monotonicallyIncreasingTime();
if (lastGCStartTime - m_lastCodeDiscardTime > minute) {
deleteAllCompiledCode();
m_lastCodeDiscardTime = WTF::monotonicallyIncreasingTime();
}
{
GCPHASE(Canonicalize);
m_objectSpace.canonicalizeCellLivenessData();
}
markRoots();
{
GCPHASE(ReapingWeakHandles);
m_objectSpace.reapWeakSets();
}
JAVASCRIPTCORE_GC_MARKED();
{
GCPHASE(SweepingArrayBuffers);
m_arrayBuffers.sweep();
}
{
m_blockSnapshot.resize(m_objectSpace.blocks().set().size());
MarkedBlockSnapshotFunctor functor(m_blockSnapshot);
m_objectSpace.forEachBlock(functor);
}
copyBackingStores();
{
GCPHASE(FinalizeUnconditionalFinalizers);
finalizeUnconditionalFinalizers();
}
{
GCPHASE(DeleteCodeBlocks);
deleteUnmarkedCompiledCode();
}
{
GCPHASE(DeleteSourceProviderCaches);
m_vm->clearSourceProviderCaches();
}
if (sweepToggle == DoSweep) {
SamplingRegion samplingRegion("Garbage Collection: Sweeping");
GCPHASE(Sweeping);
m_objectSpace.sweep();
m_objectSpace.shrink();
}
m_sweeper->startSweeping(m_blockSnapshot);
m_bytesAbandoned = 0;
{
GCPHASE(ResetAllocators);
m_objectSpace.resetAllocators();
}
size_t currentHeapSize = sizeAfterCollect();
if (Options::gcMaxHeapSize() && currentHeapSize > Options::gcMaxHeapSize())
HeapStatistics::exitWithFailure();
m_sizeAfterLastCollect = currentHeapSize;
// To avoid pathological GC churn in very small and very large heaps, we set
// the new allocation limit based on the current size of the heap, with a
// fixed minimum.
size_t maxHeapSize = max(minHeapSize(m_heapType, m_ramSize), proportionalHeapSize(currentHeapSize, m_ramSize));
m_bytesAllocatedLimit = maxHeapSize - currentHeapSize;
m_bytesAllocated = 0;
double lastGCEndTime = WTF::monotonicallyIncreasingTime();
m_lastGCLength = lastGCEndTime - lastGCStartTime;
if (Options::recordGCPauseTimes())
HeapStatistics::recordGCPauseTime(lastGCStartTime, lastGCEndTime);
RELEASE_ASSERT(m_operationInProgress == Collection);
m_operationInProgress = NoOperation;
JAVASCRIPTCORE_GC_END();
if (Options::useZombieMode())
zombifyDeadObjects();
if (Options::objectsAreImmortal())
markDeadObjects();
if (Options::showObjectStatistics())
HeapStatistics::showObjectStatistics(this);
if (Options::logGC()) {
double after = currentTimeMS();
dataLog(after - before, " ms, ", currentHeapSize / 1024, " kb]\n");
}
#if ENABLE(ALLOCATION_LOGGING)
dataLogF("JSC GC finishing collection.\n");
#endif
}
static Thread* createForCurrentThread()
{
return new Thread(getCurrentPlatformThread(), wtfThreadData().stack().origin());
}
VM::VM(VMType vmType, HeapType heapType)
: m_apiLock(adoptRef(new JSLock(this)))
#if ENABLE(ASSEMBLER)
, executableAllocator(*this)
#endif
, heap(this, heapType)
, vmType(vmType)
, clientData(0)
, topVMEntryFrame(nullptr)
, topCallFrame(CallFrame::noCaller())
, m_atomicStringTable(vmType == Default ? wtfThreadData().atomicStringTable() : new AtomicStringTable)
, propertyNames(nullptr)
, emptyList(new MarkedArgumentBuffer)
, stringCache(*this)
, prototypeMap(*this)
, keywords(std::make_unique<Keywords>(*this))
, interpreter(0)
, jsArrayClassInfo(JSArray::info())
, jsFinalObjectClassInfo(JSFinalObject::info())
, sizeOfLastScratchBuffer(0)
, entryScope(0)
, m_regExpCache(new RegExpCache(this))
#if ENABLE(REGEXP_TRACING)
, m_rtTraceList(new RTTraceList())
#endif
, m_newStringsSinceLastHashCons(0)
#if ENABLE(ASSEMBLER)
, m_canUseAssembler(enableAssembler(executableAllocator))
#endif
#if ENABLE(JIT)
, m_canUseJIT(m_canUseAssembler && Options::useJIT())
#endif
#if ENABLE(YARR_JIT)
, m_canUseRegExpJIT(m_canUseAssembler && Options::useRegExpJIT())
#endif
#if ENABLE(GC_VALIDATION)
, m_initializingObjectClass(0)
#endif
, m_stackPointerAtVMEntry(0)
, m_stackLimit(0)
#if !ENABLE(JIT)
, m_jsStackLimit(0)
#endif
#if ENABLE(FTL_JIT)
, m_ftlStackLimit(0)
, m_largestFTLStackSize(0)
#endif
, m_inDefineOwnProperty(false)
, m_codeCache(std::make_unique<CodeCache>())
, m_enabledProfiler(nullptr)
, m_builtinExecutables(std::make_unique<BuiltinExecutables>(*this))
, m_typeProfilerEnabledCount(0)
, m_controlFlowProfilerEnabledCount(0)
{
interpreter = new Interpreter(*this);
StackBounds stack = wtfThreadData().stack();
updateReservedZoneSize(Options::reservedZoneSize());
#if !ENABLE(JIT)
interpreter->stack().setReservedZoneSize(Options::reservedZoneSize());
#endif
setLastStackTop(stack.origin());
// Need to be careful to keep everything consistent here
JSLockHolder lock(this);
AtomicStringTable* existingEntryAtomicStringTable = wtfThreadData().setCurrentAtomicStringTable(m_atomicStringTable);
propertyNames = new CommonIdentifiers(this);
structureStructure.set(*this, Structure::createStructure(*this));
structureRareDataStructure.set(*this, StructureRareData::createStructure(*this, 0, jsNull()));
terminatedExecutionErrorStructure.set(*this, TerminatedExecutionError::createStructure(*this, 0, jsNull()));
stringStructure.set(*this, JSString::createStructure(*this, 0, jsNull()));
notAnObjectStructure.set(*this, JSNotAnObject::createStructure(*this, 0, jsNull()));
propertyNameEnumeratorStructure.set(*this, JSPropertyNameEnumerator::createStructure(*this, 0, jsNull()));
getterSetterStructure.set(*this, GetterSetter::createStructure(*this, 0, jsNull()));
customGetterSetterStructure.set(*this, CustomGetterSetter::createStructure(*this, 0, jsNull()));
apiWrapperStructure.set(*this, JSAPIValueWrapper::createStructure(*this, 0, jsNull()));
JSScopeStructure.set(*this, JSScope::createStructure(*this, 0, jsNull()));
executableStructure.set(*this, ExecutableBase::createStructure(*this, 0, jsNull()));
nativeExecutableStructure.set(*this, NativeExecutable::createStructure(*this, 0, jsNull()));
evalExecutableStructure.set(*this, EvalExecutable::createStructure(*this, 0, jsNull()));
programExecutableStructure.set(*this, ProgramExecutable::createStructure(*this, 0, jsNull()));
functionExecutableStructure.set(*this, FunctionExecutable::createStructure(*this, 0, jsNull()));
regExpStructure.set(*this, RegExp::createStructure(*this, 0, jsNull()));
symbolStructure.set(*this, Symbol::createStructure(*this, 0, jsNull()));
symbolTableStructure.set(*this, SymbolTable::createStructure(*this, 0, jsNull()));
structureChainStructure.set(*this, StructureChain::createStructure(*this, 0, jsNull()));
sparseArrayValueMapStructure.set(*this, SparseArrayValueMap::createStructure(*this, 0, jsNull()));
arrayBufferNeuteringWatchpointStructure.set(*this, ArrayBufferNeuteringWatchpoint::createStructure(*this));
unlinkedFunctionExecutableStructure.set(*this, UnlinkedFunctionExecutable::createStructure(*this, 0, jsNull()));
unlinkedProgramCodeBlockStructure.set(*this, UnlinkedProgramCodeBlock::createStructure(*this, 0, jsNull()));
unlinkedEvalCodeBlockStructure.set(*this, UnlinkedEvalCodeBlock::createStructure(*this, 0, jsNull()));
unlinkedFunctionCodeBlockStructure.set(*this, UnlinkedFunctionCodeBlock::createStructure(*this, 0, jsNull()));
propertyTableStructure.set(*this, PropertyTable::createStructure(*this, 0, jsNull()));
mapDataStructure.set(*this, MapData::createStructure(*this, 0, jsNull()));
weakMapDataStructure.set(*this, WeakMapData::createStructure(*this, 0, jsNull()));
#if ENABLE(PROMISES)
promiseDeferredStructure.set(*this, JSPromiseDeferred::createStructure(*this, 0, jsNull()));
promiseReactionStructure.set(*this, JSPromiseReaction::createStructure(*this, 0, jsNull()));
#endif
iterationTerminator.set(*this, JSFinalObject::create(*this, JSFinalObject::createStructure(*this, 0, jsNull(), 1)));
smallStrings.initializeCommonStrings(*this);
wtfThreadData().setCurrentAtomicStringTable(existingEntryAtomicStringTable);
#if ENABLE(JIT)
jitStubs = std::make_unique<JITThunks>();
arityCheckFailReturnThunks = std::make_unique<ArityCheckFailReturnThunks>();
#endif
arityCheckData = std::make_unique<CommonSlowPaths::ArityCheckData>();
#if ENABLE(FTL_JIT)
ftlThunks = std::make_unique<FTL::Thunks>();
#endif // ENABLE(FTL_JIT)
interpreter->initialize(this->canUseJIT());
#if ENABLE(JIT)
initializeHostCallReturnValue(); // This is needed to convince the linker not to drop host call return support.
#endif
heap.notifyIsSafeToCollect();
LLInt::Data::performAssertions(*this);
if (Options::enableProfiler()) {
m_perBytecodeProfiler = std::make_unique<Profiler::Database>(*this);
StringPrintStream pathOut;
const char* profilerPath = getenv("JSC_PROFILER_PATH");
if (profilerPath)
pathOut.print(profilerPath, "/");
pathOut.print("JSCProfile-", getCurrentProcessID(), "-", m_perBytecodeProfiler->databaseID(), ".json");
m_perBytecodeProfiler->registerToSaveAtExit(pathOut.toCString().data());
}
#if ENABLE(DFG_JIT)
if (canUseJIT())
dfgState = std::make_unique<DFG::LongLivedState>();
#endif
// Initialize this last, as a free way of asserting that VM initialization itself
// won't use this.
m_typedArrayController = adoptRef(new SimpleTypedArrayController());
if (Options::enableTypeProfiler())
enableTypeProfiler();
if (Options::enableControlFlowProfiler())
enableControlFlowProfiler();
}
JSGlueAPIEntry::JSGlueAPIEntry()
: m_lock(LockForReal)
, m_storedIdentifierTable(wtfThreadData().currentIdentifierTable())
{
wtfThreadData().setCurrentIdentifierTable(getThreadGlobalData()->identifierTable);
}
JSGlobalData::JSGlobalData(GlobalDataType globalDataType, ThreadStackType threadStackType)
: globalDataType(globalDataType)
, clientData(0)
, arrayTable(fastNew<HashTable>(JSC::arrayTable))
, dateTable(fastNew<HashTable>(JSC::dateTable))
, jsonTable(fastNew<HashTable>(JSC::jsonTable))
, mathTable(fastNew<HashTable>(JSC::mathTable))
, numberTable(fastNew<HashTable>(JSC::numberTable))
, objectConstructorTable(fastNew<HashTable>(JSC::objectConstructorTable))
, regExpTable(fastNew<HashTable>(JSC::regExpTable))
, regExpConstructorTable(fastNew<HashTable>(JSC::regExpConstructorTable))
, stringTable(fastNew<HashTable>(JSC::stringTable))
, identifierTable(globalDataType == Default ? wtfThreadData().currentIdentifierTable() : createIdentifierTable())
, propertyNames(new CommonIdentifiers(this))
, emptyList(new MarkedArgumentBuffer)
, lexer(new Lexer(this))
, parser(new Parser)
, interpreter(0)
, heap(this)
, globalObjectCount(0)
, dynamicGlobalObject(0)
, cachedUTCOffset(NaN)
, maxReentryDepth(threadStackType == ThreadStackTypeSmall ? MaxSmallThreadReentryDepth : MaxLargeThreadReentryDepth)
, m_regExpCache(new RegExpCache(this))
#if ENABLE(REGEXP_TRACING)
, m_rtTraceList(new RTTraceList())
#endif
#ifndef NDEBUG
, exclusiveThread(0)
#endif
{
activationStructure = JSActivation::createStructure(*this, jsNull());
interruptedExecutionErrorStructure = JSNonFinalObject::createStructure(*this, jsNull());
terminatedExecutionErrorStructure = JSNonFinalObject::createStructure(*this, jsNull());
staticScopeStructure = JSStaticScopeObject::createStructure(*this, jsNull());
strictEvalActivationStructure = StrictEvalActivation::createStructure(*this, jsNull());
stringStructure = JSString::createStructure(*this, jsNull());
notAnObjectStructure = JSNotAnObject::createStructure(*this, jsNull());
propertyNameIteratorStructure = JSPropertyNameIterator::createStructure(*this, jsNull());
getterSetterStructure = GetterSetter::createStructure(*this, jsNull());
apiWrapperStructure = JSAPIValueWrapper::createStructure(*this, jsNull());
scopeChainNodeStructure = ScopeChainNode::createStructure(*this, jsNull());
executableStructure = ExecutableBase::createStructure(*this, jsNull());
evalExecutableStructure = EvalExecutable::createStructure(*this, jsNull());
programExecutableStructure = ProgramExecutable::createStructure(*this, jsNull());
functionExecutableStructure = FunctionExecutable::createStructure(*this, jsNull());
dummyMarkableCellStructure = JSCell::createDummyStructure(*this);
interpreter = new Interpreter(*this);
if (globalDataType == Default)
m_stack = wtfThreadData().stack();
#if PLATFORM(MAC)
//startProfilerServerIfNeeded();
#endif
#if ENABLE(JIT) && ENABLE(INTERPRETER)
#if USE(CF)
CFStringRef canUseJITKey = CFStringCreateWithCString(0 , "JavaScriptCoreUseJIT", kCFStringEncodingMacRoman);
CFBooleanRef canUseJIT = (CFBooleanRef)CFPreferencesCopyAppValue(canUseJITKey, kCFPreferencesCurrentApplication);
if (canUseJIT) {
m_canUseJIT = kCFBooleanTrue == canUseJIT;
CFRelease(canUseJIT);
} else {
char* canUseJITString = getenv("JavaScriptCoreUseJIT");
m_canUseJIT = !canUseJITString || atoi(canUseJITString);
}
CFRelease(canUseJITKey);
#elif OS(UNIX)
char* canUseJITString = getenv("JavaScriptCoreUseJIT");
m_canUseJIT = !canUseJITString || atoi(canUseJITString);
#else
m_canUseJIT = true;
#endif
#endif
#if ENABLE(JIT)
#if ENABLE(INTERPRETER)
if (m_canUseJIT)
m_canUseJIT = executableAllocator.isValid();
#endif
jitStubs = new JITThunks(this);
#endif
}
bool checkSyntax(VM& vm, const SourceCode& source, ParserError& error)
{
JSLockHolder lock(vm);
RELEASE_ASSERT(vm.atomicStringTable() == wtfThreadData().atomicStringTable());
return !!parse<ProgramNode>(&vm, source, 0, Identifier(), JSParseNormal, JSParseProgramCode, error);
}
VM::VM(VMType vmType, HeapType heapType)
: m_apiLock(adoptRef(new JSLock(this)))
#if ENABLE(ASSEMBLER)
, executableAllocator(*this)
#endif
, heap(this, heapType)
, vmType(vmType)
, clientData(0)
, topCallFrame(CallFrame::noCaller()->removeHostCallFrameFlag())
, arrayConstructorTable(adoptPtr(new HashTable(JSC::arrayConstructorTable)))
, arrayPrototypeTable(adoptPtr(new HashTable(JSC::arrayPrototypeTable)))
, booleanPrototypeTable(adoptPtr(new HashTable(JSC::booleanPrototypeTable)))
, dataViewTable(adoptPtr(new HashTable(JSC::dataViewTable)))
, dateTable(adoptPtr(new HashTable(JSC::dateTable)))
, dateConstructorTable(adoptPtr(new HashTable(JSC::dateConstructorTable)))
, errorPrototypeTable(adoptPtr(new HashTable(JSC::errorPrototypeTable)))
, globalObjectTable(adoptPtr(new HashTable(JSC::globalObjectTable)))
, jsonTable(adoptPtr(new HashTable(JSC::jsonTable)))
, numberConstructorTable(adoptPtr(new HashTable(JSC::numberConstructorTable)))
, numberPrototypeTable(adoptPtr(new HashTable(JSC::numberPrototypeTable)))
, objectConstructorTable(adoptPtr(new HashTable(JSC::objectConstructorTable)))
, privateNamePrototypeTable(adoptPtr(new HashTable(JSC::privateNamePrototypeTable)))
, regExpTable(adoptPtr(new HashTable(JSC::regExpTable)))
, regExpConstructorTable(adoptPtr(new HashTable(JSC::regExpConstructorTable)))
, regExpPrototypeTable(adoptPtr(new HashTable(JSC::regExpPrototypeTable)))
, stringConstructorTable(adoptPtr(new HashTable(JSC::stringConstructorTable)))
#if ENABLE(PROMISES)
, promisePrototypeTable(adoptPtr(new HashTable(JSC::promisePrototypeTable)))
, promiseConstructorTable(adoptPtr(new HashTable(JSC::promiseConstructorTable)))
, promiseResolverPrototypeTable(adoptPtr(new HashTable(JSC::promiseResolverPrototypeTable)))
#endif
, identifierTable(vmType == Default ? wtfThreadData().currentIdentifierTable() : createIdentifierTable())
, propertyNames(new CommonIdentifiers(this))
, emptyList(new MarkedArgumentBuffer)
, parserArena(adoptPtr(new ParserArena))
, keywords(adoptPtr(new Keywords(this)))
, interpreter(0)
, jsArrayClassInfo(JSArray::info())
, jsFinalObjectClassInfo(JSFinalObject::info())
#if ENABLE(DFG_JIT)
, sizeOfLastScratchBuffer(0)
#endif
, dynamicGlobalObject(0)
, m_enabledProfiler(0)
, m_regExpCache(new RegExpCache(this))
#if ENABLE(REGEXP_TRACING)
, m_rtTraceList(new RTTraceList())
#endif
, exclusiveThread(0)
, m_newStringsSinceLastHashCons(0)
#if ENABLE(ASSEMBLER)
, m_canUseAssembler(enableAssembler(executableAllocator))
#endif
#if ENABLE(JIT)
, m_canUseJIT(m_canUseAssembler && Options::useJIT())
#endif
#if ENABLE(YARR_JIT)
, m_canUseRegExpJIT(m_canUseAssembler && Options::useRegExpJIT())
#endif
#if ENABLE(GC_VALIDATION)
, m_initializingObjectClass(0)
#endif
, m_inDefineOwnProperty(false)
, m_codeCache(CodeCache::create())
{
interpreter = new Interpreter(*this);
// Need to be careful to keep everything consistent here
JSLockHolder lock(this);
IdentifierTable* existingEntryIdentifierTable = wtfThreadData().setCurrentIdentifierTable(identifierTable);
structureStructure.set(*this, Structure::createStructure(*this));
structureRareDataStructure.set(*this, StructureRareData::createStructure(*this, 0, jsNull()));
debuggerActivationStructure.set(*this, DebuggerActivation::createStructure(*this, 0, jsNull()));
terminatedExecutionErrorStructure.set(*this, TerminatedExecutionError::createStructure(*this, 0, jsNull()));
stringStructure.set(*this, JSString::createStructure(*this, 0, jsNull()));
notAnObjectStructure.set(*this, JSNotAnObject::createStructure(*this, 0, jsNull()));
propertyNameIteratorStructure.set(*this, JSPropertyNameIterator::createStructure(*this, 0, jsNull()));
getterSetterStructure.set(*this, GetterSetter::createStructure(*this, 0, jsNull()));
apiWrapperStructure.set(*this, JSAPIValueWrapper::createStructure(*this, 0, jsNull()));
JSScopeStructure.set(*this, JSScope::createStructure(*this, 0, jsNull()));
executableStructure.set(*this, ExecutableBase::createStructure(*this, 0, jsNull()));
nativeExecutableStructure.set(*this, NativeExecutable::createStructure(*this, 0, jsNull()));
evalExecutableStructure.set(*this, EvalExecutable::createStructure(*this, 0, jsNull()));
programExecutableStructure.set(*this, ProgramExecutable::createStructure(*this, 0, jsNull()));
functionExecutableStructure.set(*this, FunctionExecutable::createStructure(*this, 0, jsNull()));
regExpStructure.set(*this, RegExp::createStructure(*this, 0, jsNull()));
sharedSymbolTableStructure.set(*this, SharedSymbolTable::createStructure(*this, 0, jsNull()));
structureChainStructure.set(*this, StructureChain::createStructure(*this, 0, jsNull()));
sparseArrayValueMapStructure.set(*this, SparseArrayValueMap::createStructure(*this, 0, jsNull()));
withScopeStructure.set(*this, JSWithScope::createStructure(*this, 0, jsNull()));
unlinkedFunctionExecutableStructure.set(*this, UnlinkedFunctionExecutable::createStructure(*this, 0, jsNull()));
unlinkedProgramCodeBlockStructure.set(*this, UnlinkedProgramCodeBlock::createStructure(*this, 0, jsNull()));
unlinkedEvalCodeBlockStructure.set(*this, UnlinkedEvalCodeBlock::createStructure(*this, 0, jsNull()));
unlinkedFunctionCodeBlockStructure.set(*this, UnlinkedFunctionCodeBlock::createStructure(*this, 0, jsNull()));
propertyTableStructure.set(*this, PropertyTable::createStructure(*this, 0, jsNull()));
smallStrings.initializeCommonStrings(*this);
wtfThreadData().setCurrentIdentifierTable(existingEntryIdentifierTable);
#if ENABLE(JIT)
jitStubs = adoptPtr(new JITThunks());
performPlatformSpecificJITAssertions(this);
#endif
interpreter->initialize(this->canUseJIT());
#if ENABLE(JIT)
initializeHostCallReturnValue(); // This is needed to convince the linker not to drop host call return support.
#endif
heap.notifyIsSafeToCollect();
LLInt::Data::performAssertions(*this);
if (Options::enableProfiler()) {
m_perBytecodeProfiler = adoptPtr(new Profiler::Database(*this));
StringPrintStream pathOut;
#if !OS(WINCE)
const char* profilerPath = getenv("JSC_PROFILER_PATH");
if (profilerPath)
pathOut.print(profilerPath, "/");
#endif
pathOut.print("JSCProfile-", getCurrentProcessID(), "-", m_perBytecodeProfiler->databaseID(), ".json");
m_perBytecodeProfiler->registerToSaveAtExit(pathOut.toCString().data());
}
#if ENABLE(DFG_JIT)
if (canUseJIT())
dfgState = adoptPtr(new DFG::LongLivedState());
#endif
// Initialize this last, as a free way of asserting that VM initialization itself
// won't use this.
m_typedArrayController = adoptRef(new SimpleTypedArrayController());
}
NEVER_INLINE void Heap::collectImpl(HeapOperation collectionType, void* stackOrigin, void* stackTop, MachineThreads::RegisterState& calleeSavedRegisters)
{
#if ENABLE(ALLOCATION_LOGGING)
dataLogF("JSC GC starting collection.\n");
#endif
double before = 0;
if (Options::logGC()) {
dataLog("[GC: ");
before = currentTimeMS();
}
SamplingRegion samplingRegion("Garbage Collection");
if (vm()->typeProfiler()) {
DeferGCForAWhile awhile(*this);
vm()->typeProfilerLog()->processLogEntries(ASCIILiteral("GC"));
}
RELEASE_ASSERT(!m_deferralDepth);
ASSERT(vm()->currentThreadIsHoldingAPILock());
RELEASE_ASSERT(vm()->atomicStringTable() == wtfThreadData().atomicStringTable());
ASSERT(m_isSafeToCollect);
JAVASCRIPTCORE_GC_BEGIN();
RELEASE_ASSERT(m_operationInProgress == NoOperation);
suspendCompilerThreads();
willStartCollection(collectionType);
GCPHASE(Collect);
double gcStartTime = WTF::monotonicallyIncreasingTime();
if (m_verifier) {
// Verify that live objects from the last GC cycle haven't been corrupted by
// mutators before we begin this new GC cycle.
m_verifier->verify(HeapVerifier::Phase::BeforeGC);
m_verifier->initializeGCCycle();
m_verifier->gatherLiveObjects(HeapVerifier::Phase::BeforeMarking);
}
flushOldStructureIDTables();
stopAllocation();
flushWriteBarrierBuffer();
markRoots(gcStartTime, stackOrigin, stackTop, calleeSavedRegisters);
if (m_verifier) {
m_verifier->gatherLiveObjects(HeapVerifier::Phase::AfterMarking);
m_verifier->verify(HeapVerifier::Phase::AfterMarking);
}
JAVASCRIPTCORE_GC_MARKED();
if (vm()->typeProfiler())
vm()->typeProfiler()->invalidateTypeSetCache();
reapWeakHandles();
pruneStaleEntriesFromWeakGCMaps();
sweepArrayBuffers();
snapshotMarkedSpace();
copyBackingStores();
finalizeUnconditionalFinalizers();
removeDeadCompilerWorklistEntries();
deleteUnmarkedCompiledCode();
deleteSourceProviderCaches();
notifyIncrementalSweeper();
rememberCurrentlyExecutingCodeBlocks();
resetAllocators();
updateAllocationLimits();
didFinishCollection(gcStartTime);
resumeCompilerThreads();
if (m_verifier) {
m_verifier->trimDeadObjects();
m_verifier->verify(HeapVerifier::Phase::AfterGC);
}
if (Options::logGC()) {
double after = currentTimeMS();
dataLog(after - before, " ms]\n");
}
}
void Identifier::checkCurrentIdentifierTable(JSGlobalData* globalData)
{
// Check the identifier table accessible through the threadspecific matches the
// globalData's identifier table.
ASSERT_UNUSED(globalData, globalData->identifierTable == wtfThreadData().currentIdentifierTable());
}
JSGlobalData::JSGlobalData(GlobalDataType globalDataType, ThreadStackType threadStackType, HeapSize heapSize)
: globalDataType(globalDataType)
, clientData(0)
, topCallFrame(CallFrame::noCaller())
, arrayConstructorTable(fastNew<HashTable>(JSC::arrayConstructorTable))
, arrayPrototypeTable(fastNew<HashTable>(JSC::arrayPrototypeTable))
, booleanPrototypeTable(fastNew<HashTable>(JSC::booleanPrototypeTable))
, dateTable(fastNew<HashTable>(JSC::dateTable))
, dateConstructorTable(fastNew<HashTable>(JSC::dateConstructorTable))
, errorPrototypeTable(fastNew<HashTable>(JSC::errorPrototypeTable))
, globalObjectTable(fastNew<HashTable>(JSC::globalObjectTable))
, jsonTable(fastNew<HashTable>(JSC::jsonTable))
, mathTable(fastNew<HashTable>(JSC::mathTable))
, numberConstructorTable(fastNew<HashTable>(JSC::numberConstructorTable))
, numberPrototypeTable(fastNew<HashTable>(JSC::numberPrototypeTable))
, objectConstructorTable(fastNew<HashTable>(JSC::objectConstructorTable))
, objectPrototypeTable(fastNew<HashTable>(JSC::objectPrototypeTable))
, regExpTable(fastNew<HashTable>(JSC::regExpTable))
, regExpConstructorTable(fastNew<HashTable>(JSC::regExpConstructorTable))
, regExpPrototypeTable(fastNew<HashTable>(JSC::regExpPrototypeTable))
, stringTable(fastNew<HashTable>(JSC::stringTable))
, stringConstructorTable(fastNew<HashTable>(JSC::stringConstructorTable))
, identifierTable(globalDataType == Default ? wtfThreadData().currentIdentifierTable() : createIdentifierTable())
, propertyNames(new CommonIdentifiers(this))
, emptyList(new MarkedArgumentBuffer)
#if ENABLE(ASSEMBLER)
, executableAllocator(*this)
#endif
, parserArena(adoptPtr(new ParserArena))
, keywords(adoptPtr(new Keywords(this)))
, interpreter(0)
, heap(this, heapSize)
#if ENABLE(DFG_JIT)
, sizeOfLastScratchBuffer(0)
#endif
, dynamicGlobalObject(0)
, cachedUTCOffset(std::numeric_limits<double>::quiet_NaN())
, maxReentryDepth(threadStackType == ThreadStackTypeSmall ? MaxSmallThreadReentryDepth : MaxLargeThreadReentryDepth)
, m_regExpCache(new RegExpCache(this))
#if ENABLE(REGEXP_TRACING)
, m_rtTraceList(new RTTraceList())
#endif
#ifndef NDEBUG
, exclusiveThread(0)
#endif
#if CPU(X86) && ENABLE(JIT)
, m_timeoutCount(512)
#endif
#if ENABLE(GC_VALIDATION)
, m_isInitializingObject(false)
#endif
{
interpreter = new Interpreter;
if (globalDataType == Default)
m_stack = wtfThreadData().stack();
// Need to be careful to keep everything consistent here
IdentifierTable* existingEntryIdentifierTable = wtfThreadData().setCurrentIdentifierTable(identifierTable);
JSLock lock(SilenceAssertionsOnly);
structureStructure.set(*this, Structure::createStructure(*this));
debuggerActivationStructure.set(*this, DebuggerActivation::createStructure(*this, 0, jsNull()));
activationStructure.set(*this, JSActivation::createStructure(*this, 0, jsNull()));
interruptedExecutionErrorStructure.set(*this, InterruptedExecutionError::createStructure(*this, 0, jsNull()));
terminatedExecutionErrorStructure.set(*this, TerminatedExecutionError::createStructure(*this, 0, jsNull()));
staticScopeStructure.set(*this, JSStaticScopeObject::createStructure(*this, 0, jsNull()));
strictEvalActivationStructure.set(*this, StrictEvalActivation::createStructure(*this, 0, jsNull()));
stringStructure.set(*this, JSString::createStructure(*this, 0, jsNull()));
notAnObjectStructure.set(*this, JSNotAnObject::createStructure(*this, 0, jsNull()));
propertyNameIteratorStructure.set(*this, JSPropertyNameIterator::createStructure(*this, 0, jsNull()));
getterSetterStructure.set(*this, GetterSetter::createStructure(*this, 0, jsNull()));
apiWrapperStructure.set(*this, JSAPIValueWrapper::createStructure(*this, 0, jsNull()));
scopeChainNodeStructure.set(*this, ScopeChainNode::createStructure(*this, 0, jsNull()));
executableStructure.set(*this, ExecutableBase::createStructure(*this, 0, jsNull()));
nativeExecutableStructure.set(*this, NativeExecutable::createStructure(*this, 0, jsNull()));
evalExecutableStructure.set(*this, EvalExecutable::createStructure(*this, 0, jsNull()));
programExecutableStructure.set(*this, ProgramExecutable::createStructure(*this, 0, jsNull()));
functionExecutableStructure.set(*this, FunctionExecutable::createStructure(*this, 0, jsNull()));
regExpStructure.set(*this, RegExp::createStructure(*this, 0, jsNull()));
structureChainStructure.set(*this, StructureChain::createStructure(*this, 0, jsNull()));
wtfThreadData().setCurrentIdentifierTable(existingEntryIdentifierTable);
#if ENABLE(JIT) && ENABLE(INTERPRETER)
#if USE(CF)
CFStringRef canUseJITKey = CFStringCreateWithCString(0 , "JavaScriptCoreUseJIT", kCFStringEncodingMacRoman);
CFBooleanRef canUseJIT = (CFBooleanRef)CFPreferencesCopyAppValue(canUseJITKey, kCFPreferencesCurrentApplication);
if (canUseJIT) {
m_canUseJIT = kCFBooleanTrue == canUseJIT;
CFRelease(canUseJIT);
} else {
char* canUseJITString = getenv("JavaScriptCoreUseJIT");
m_canUseJIT = !canUseJITString || atoi(canUseJITString);
}
CFRelease(canUseJITKey);
#elif OS(UNIX)
char* canUseJITString = getenv("JavaScriptCoreUseJIT");
m_canUseJIT = !canUseJITString || atoi(canUseJITString);
#else
m_canUseJIT = true;
#endif
#endif
#if ENABLE(JIT)
#if ENABLE(INTERPRETER)
if (m_canUseJIT)
m_canUseJIT = executableAllocator.isValid();
#endif
jitStubs = adoptPtr(new JITThunks(this));
#endif
interpreter->initialize(this->canUseJIT());
heap.notifyIsSafeToCollect();
}
JSGlueAPIEntry::~JSGlueAPIEntry()
{
wtfThreadData().setCurrentIdentifierTable(m_storedIdentifierTable);
}
JSGlobalData::JSGlobalData(GlobalDataType globalDataType, HeapType heapType)
:
#if ENABLE(ASSEMBLER)
executableAllocator(*this),
#endif
heap(this, heapType)
, globalDataType(globalDataType)
, clientData(0)
, topCallFrame(CallFrame::noCaller())
, arrayConstructorTable(fastNew<HashTable>(JSC::arrayConstructorTable))
, arrayPrototypeTable(fastNew<HashTable>(JSC::arrayPrototypeTable))
, booleanPrototypeTable(fastNew<HashTable>(JSC::booleanPrototypeTable))
, dateTable(fastNew<HashTable>(JSC::dateTable))
, dateConstructorTable(fastNew<HashTable>(JSC::dateConstructorTable))
, errorPrototypeTable(fastNew<HashTable>(JSC::errorPrototypeTable))
, globalObjectTable(fastNew<HashTable>(JSC::globalObjectTable))
, jsonTable(fastNew<HashTable>(JSC::jsonTable))
, mathTable(fastNew<HashTable>(JSC::mathTable))
, numberConstructorTable(fastNew<HashTable>(JSC::numberConstructorTable))
, numberPrototypeTable(fastNew<HashTable>(JSC::numberPrototypeTable))
, objectConstructorTable(fastNew<HashTable>(JSC::objectConstructorTable))
, objectPrototypeTable(fastNew<HashTable>(JSC::objectPrototypeTable))
, privateNamePrototypeTable(fastNew<HashTable>(JSC::privateNamePrototypeTable))
, regExpTable(fastNew<HashTable>(JSC::regExpTable))
, regExpConstructorTable(fastNew<HashTable>(JSC::regExpConstructorTable))
, regExpPrototypeTable(fastNew<HashTable>(JSC::regExpPrototypeTable))
, stringTable(fastNew<HashTable>(JSC::stringTable))
, stringConstructorTable(fastNew<HashTable>(JSC::stringConstructorTable))
, identifierTable(globalDataType == Default ? wtfThreadData().currentIdentifierTable() : createIdentifierTable())
, propertyNames(new CommonIdentifiers(this))
, emptyList(new MarkedArgumentBuffer)
, parserArena(adoptPtr(new ParserArena))
, keywords(adoptPtr(new Keywords(this)))
, interpreter(0)
, jsArrayClassInfo(&JSArray::s_info)
, jsFinalObjectClassInfo(&JSFinalObject::s_info)
#if ENABLE(DFG_JIT)
, sizeOfLastScratchBuffer(0)
#endif
, dynamicGlobalObject(0)
, cachedUTCOffset(QNaN)
, m_enabledProfiler(0)
, m_regExpCache(new RegExpCache(this))
#if ENABLE(REGEXP_TRACING)
, m_rtTraceList(new RTTraceList())
#endif
#ifndef NDEBUG
, exclusiveThread(0)
#endif
#if CPU(X86) && ENABLE(JIT)
, m_timeoutCount(512)
#endif
, m_newStringsSinceLastHashConst(0)
#if ENABLE(ASSEMBLER)
, m_canUseAssembler(enableAssembler(executableAllocator))
#endif
#if ENABLE(JIT)
, m_canUseJIT(m_canUseAssembler && Options::useJIT())
#endif
#if ENABLE(YARR_JIT)
, m_canUseRegExpJIT(m_canUseAssembler && Options::useRegExpJIT())
#endif
#if ENABLE(GC_VALIDATION)
, m_initializingObjectClass(0)
#endif
, m_inDefineOwnProperty(false)
, m_codeCache(CodeCache::create())
{
interpreter = new Interpreter(*this);
// Need to be careful to keep everything consistent here
JSLockHolder lock(this);
IdentifierTable* existingEntryIdentifierTable = wtfThreadData().setCurrentIdentifierTable(identifierTable);
structureStructure.set(*this, Structure::createStructure(*this));
debuggerActivationStructure.set(*this, DebuggerActivation::createStructure(*this, 0, jsNull()));
interruptedExecutionErrorStructure.set(*this, InterruptedExecutionError::createStructure(*this, 0, jsNull()));
terminatedExecutionErrorStructure.set(*this, TerminatedExecutionError::createStructure(*this, 0, jsNull()));
stringStructure.set(*this, JSString::createStructure(*this, 0, jsNull()));
notAnObjectStructure.set(*this, JSNotAnObject::createStructure(*this, 0, jsNull()));
propertyNameIteratorStructure.set(*this, JSPropertyNameIterator::createStructure(*this, 0, jsNull()));
getterSetterStructure.set(*this, GetterSetter::createStructure(*this, 0, jsNull()));
apiWrapperStructure.set(*this, JSAPIValueWrapper::createStructure(*this, 0, jsNull()));
JSScopeStructure.set(*this, JSScope::createStructure(*this, 0, jsNull()));
executableStructure.set(*this, ExecutableBase::createStructure(*this, 0, jsNull()));
nativeExecutableStructure.set(*this, NativeExecutable::createStructure(*this, 0, jsNull()));
evalExecutableStructure.set(*this, EvalExecutable::createStructure(*this, 0, jsNull()));
programExecutableStructure.set(*this, ProgramExecutable::createStructure(*this, 0, jsNull()));
functionExecutableStructure.set(*this, FunctionExecutable::createStructure(*this, 0, jsNull()));
regExpStructure.set(*this, RegExp::createStructure(*this, 0, jsNull()));
sharedSymbolTableStructure.set(*this, SharedSymbolTable::createStructure(*this, 0, jsNull()));
structureChainStructure.set(*this, StructureChain::createStructure(*this, 0, jsNull()));
sparseArrayValueMapStructure.set(*this, SparseArrayValueMap::createStructure(*this, 0, jsNull()));
withScopeStructure.set(*this, JSWithScope::createStructure(*this, 0, jsNull()));
unlinkedFunctionExecutableStructure.set(*this, UnlinkedFunctionExecutable::createStructure(*this, 0, jsNull()));
unlinkedProgramCodeBlockStructure.set(*this, UnlinkedProgramCodeBlock::createStructure(*this, 0, jsNull()));
unlinkedEvalCodeBlockStructure.set(*this, UnlinkedEvalCodeBlock::createStructure(*this, 0, jsNull()));
unlinkedFunctionCodeBlockStructure.set(*this, UnlinkedFunctionCodeBlock::createStructure(*this, 0, jsNull()));
wtfThreadData().setCurrentIdentifierTable(existingEntryIdentifierTable);
#if ENABLE(JIT)
jitStubs = adoptPtr(new JITThunks(this));
#endif
interpreter->initialize(this->canUseJIT());
#if ENABLE(JIT)
initializeHostCallReturnValue(); // This is needed to convince the linker not to drop host call return support.
#endif
heap.notifyIsSafeToCollect();
LLInt::Data::performAssertions(*this);
if (Options::enableProfiler())
m_perBytecodeProfiler = adoptPtr(new Profiler::Database(*this));
}
JSGlueAPICallback::JSGlueAPICallback(ExecState* exec)
: m_dropLocks(exec)
{
wtfThreadData().resetCurrentIdentifierTable();
}
void Heap::collect(SweepToggle sweepToggle)
{
SamplingRegion samplingRegion("Garbage Collection");
GCPHASE(Collect);
ASSERT(globalData()->apiLock().currentThreadIsHoldingLock());
RELEASE_ASSERT(globalData()->identifierTable == wtfThreadData().currentIdentifierTable());
ASSERT(m_isSafeToCollect);
JAVASCRIPTCORE_GC_BEGIN();
RELEASE_ASSERT(m_operationInProgress == NoOperation);
m_operationInProgress = Collection;
m_activityCallback->willCollect();
double lastGCStartTime = WTF::currentTime();
if (lastGCStartTime - m_lastCodeDiscardTime > minute) {
deleteAllCompiledCode();
m_lastCodeDiscardTime = WTF::currentTime();
}
{
GCPHASE(Canonicalize);
m_objectSpace.canonicalizeCellLivenessData();
}
markRoots();
{
GCPHASE(ReapingWeakHandles);
m_objectSpace.reapWeakSets();
}
JAVASCRIPTCORE_GC_MARKED();
{
m_blockSnapshot.resize(m_objectSpace.blocks().set().size());
MarkedBlockSnapshotFunctor functor(m_blockSnapshot);
m_objectSpace.forEachBlock(functor);
}
copyBackingStores();
{
GCPHASE(FinalizeUnconditionalFinalizers);
finalizeUnconditionalFinalizers();
}
{
GCPHASE(finalizeSmallStrings);
m_globalData->smallStrings.finalizeSmallStrings();
}
{
GCPHASE(DeleteCodeBlocks);
deleteUnmarkedCompiledCode();
}
{
GCPHASE(DeleteSourceProviderCaches);
m_globalData->clearSourceProviderCaches();
}
if (sweepToggle == DoSweep) {
SamplingRegion samplingRegion("Garbage Collection: Sweeping");
GCPHASE(Sweeping);
m_objectSpace.sweep();
m_objectSpace.shrink();
}
m_sweeper->startSweeping(m_blockSnapshot);
m_bytesAbandoned = 0;
{
GCPHASE(ResetAllocators);
m_objectSpace.resetAllocators();
}
size_t currentHeapSize = size();
if (Options::gcMaxHeapSize() && currentHeapSize > Options::gcMaxHeapSize())
HeapStatistics::exitWithFailure();
m_sizeAfterLastCollect = currentHeapSize;
// To avoid pathological GC churn in very small and very large heaps, we set
// the new allocation limit based on the current size of the heap, with a
// fixed minimum.
size_t maxHeapSize = max(minHeapSize(m_heapType, m_ramSize), proportionalHeapSize(currentHeapSize, m_ramSize));
m_bytesAllocatedLimit = maxHeapSize - currentHeapSize;
m_bytesAllocated = 0;
double lastGCEndTime = WTF::currentTime();
m_lastGCLength = lastGCEndTime - lastGCStartTime;
if (Options::recordGCPauseTimes())
HeapStatistics::recordGCPauseTime(lastGCStartTime, lastGCEndTime);
RELEASE_ASSERT(m_operationInProgress == Collection);
m_operationInProgress = NoOperation;
JAVASCRIPTCORE_GC_END();
if (Options::useZombieMode())
zombifyDeadObjects();
if (Options::objectsAreImmortal())
markDeadObjects();
if (Options::showObjectStatistics())
HeapStatistics::showObjectStatistics(this);
}
JSGlobalData::JSGlobalData(GlobalDataType globalDataType, ThreadStackType threadStackType, HeapSize heapSize)
: heap(this, heapSize)
, globalDataType(globalDataType)
, clientData(0)
, topCallFrame(CallFrame::noCaller())
, arrayConstructorTable(fastNew<HashTable>(JSC::arrayConstructorTable))
, arrayPrototypeTable(fastNew<HashTable>(JSC::arrayPrototypeTable))
, booleanPrototypeTable(fastNew<HashTable>(JSC::booleanPrototypeTable))
, dateTable(fastNew<HashTable>(JSC::dateTable))
, dateConstructorTable(fastNew<HashTable>(JSC::dateConstructorTable))
, errorPrototypeTable(fastNew<HashTable>(JSC::errorPrototypeTable))
, globalObjectTable(fastNew<HashTable>(JSC::globalObjectTable))
, jsonTable(fastNew<HashTable>(JSC::jsonTable))
, mathTable(fastNew<HashTable>(JSC::mathTable))
, numberConstructorTable(fastNew<HashTable>(JSC::numberConstructorTable))
, numberPrototypeTable(fastNew<HashTable>(JSC::numberPrototypeTable))
, objectConstructorTable(fastNew<HashTable>(JSC::objectConstructorTable))
, objectPrototypeTable(fastNew<HashTable>(JSC::objectPrototypeTable))
, regExpTable(fastNew<HashTable>(JSC::regExpTable))
, regExpConstructorTable(fastNew<HashTable>(JSC::regExpConstructorTable))
, regExpPrototypeTable(fastNew<HashTable>(JSC::regExpPrototypeTable))
, stringTable(fastNew<HashTable>(JSC::stringTable))
, stringConstructorTable(fastNew<HashTable>(JSC::stringConstructorTable))
, identifierTable(globalDataType == Default ? wtfThreadData().currentIdentifierTable() : createIdentifierTable())
, propertyNames(new CommonIdentifiers(this))
, emptyList(new MarkedArgumentBuffer)
#if ENABLE(ASSEMBLER)
, executableAllocator(*this)
#endif
, parserArena(adoptPtr(new ParserArena))
, keywords(adoptPtr(new Keywords(this)))
, interpreter(0)
, jsArrayClassInfo(&JSArray::s_info)
, jsFinalObjectClassInfo(&JSFinalObject::s_info)
#if ENABLE(DFG_JIT)
, sizeOfLastScratchBuffer(0)
#endif
, dynamicGlobalObject(0)
, cachedUTCOffset(std::numeric_limits<double>::quiet_NaN())
, maxReentryDepth(threadStackType == ThreadStackTypeSmall ? MaxSmallThreadReentryDepth : MaxLargeThreadReentryDepth)
, m_regExpCache(new RegExpCache(this))
#if ENABLE(REGEXP_TRACING)
, m_rtTraceList(new RTTraceList())
#endif
#ifndef NDEBUG
, exclusiveThread(0)
#endif
#if CPU(X86) && ENABLE(JIT)
, m_timeoutCount(512)
#endif
#if ENABLE(ASSEMBLER) && (ENABLE(CLASSIC_INTERPRETER) || ENABLE(LLINT))
, m_canUseAssembler(enableAssembler(executableAllocator))
#endif
#if ENABLE(GC_VALIDATION)
, m_initializingObjectClass(0)
#endif
, m_inDefineOwnProperty(false)
{
interpreter = new Interpreter;
if (isSharedInstance())
turnOffVerifier();
// Need to be careful to keep everything consistent here
IdentifierTable* existingEntryIdentifierTable = wtfThreadData().setCurrentIdentifierTable(identifierTable);
JSLock lock(SilenceAssertionsOnly);
structureStructure.set(*this, Structure::createStructure(*this));
debuggerActivationStructure.set(*this, DebuggerActivation::createStructure(*this, 0, jsNull()));
activationStructure.set(*this, JSActivation::createStructure(*this, 0, jsNull()));
interruptedExecutionErrorStructure.set(*this, InterruptedExecutionError::createStructure(*this, 0, jsNull()));
terminatedExecutionErrorStructure.set(*this, TerminatedExecutionError::createStructure(*this, 0, jsNull()));
staticScopeStructure.set(*this, JSStaticScopeObject::createStructure(*this, 0, jsNull()));
strictEvalActivationStructure.set(*this, StrictEvalActivation::createStructure(*this, 0, jsNull()));
stringStructure.set(*this, JSString::createStructure(*this, 0, jsNull()));
notAnObjectStructure.set(*this, JSNotAnObject::createStructure(*this, 0, jsNull()));
propertyNameIteratorStructure.set(*this, JSPropertyNameIterator::createStructure(*this, 0, jsNull()));
getterSetterStructure.set(*this, GetterSetter::createStructure(*this, 0, jsNull()));
apiWrapperStructure.set(*this, JSAPIValueWrapper::createStructure(*this, 0, jsNull()));
scopeChainNodeStructure.set(*this, ScopeChainNode::createStructure(*this, 0, jsNull()));
executableStructure.set(*this, ExecutableBase::createStructure(*this, 0, jsNull()));
nativeExecutableStructure.set(*this, NativeExecutable::createStructure(*this, 0, jsNull()));
evalExecutableStructure.set(*this, EvalExecutable::createStructure(*this, 0, jsNull()));
programExecutableStructure.set(*this, ProgramExecutable::createStructure(*this, 0, jsNull()));
functionExecutableStructure.set(*this, FunctionExecutable::createStructure(*this, 0, jsNull()));
regExpStructure.set(*this, RegExp::createStructure(*this, 0, jsNull()));
structureChainStructure.set(*this, StructureChain::createStructure(*this, 0, jsNull()));
wtfThreadData().setCurrentIdentifierTable(existingEntryIdentifierTable);
#if ENABLE(JIT)
jitStubs = adoptPtr(new JITThunks(this));
#endif
interpreter->initialize(&llintData, this->canUseJIT());
initializeHostCallReturnValue(); // This is needed to convince the linker not to drop host call return support.
heap.notifyIsSafeToCollect();
llintData.performAssertions(*this);
}