webkitgtk-2.12.3webkitgtk-2.12.3

1 files changed, 407 insertions, 322 deletions

diff --git a/Source/JavaScriptCore/runtime/VM.cpp b/Source/JavaScriptCore/runtime/VM.cpp
index d7e50ed61..de96ca07f 100644
--- a/Source/JavaScriptCore/runtime/VM.cpp
+++ b/Source/JavaScriptCore/runtime/VM.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2008, 2011, 2013 Apple Inc. All rights reserved.
+ * Copyright (C) 2008, 2011, 2013-2016 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -10,7 +10,7 @@
  * 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
+ * 3.  Neither the name of Apple 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. 
  *
@@ -31,54 +31,78 @@
 
 #include "ArgList.h"
 #include "ArrayBufferNeuteringWatchpoint.h"
-#include "CallFrameInlines.h"
+#include "BuiltinExecutables.h"
+#include "BytecodeIntrinsicRegistry.h"
 #include "CodeBlock.h"
 #include "CodeCache.h"
 #include "CommonIdentifiers.h"
+#include "CommonSlowPaths.h"
+#include "CustomGetterSetter.h"
 #include "DFGLongLivedState.h"
 #include "DFGWorklist.h"
-#include "DebuggerActivation.h"
+#include "Disassembler.h"
 #include "ErrorInstance.h"
+#include "Exception.h"
 #include "FTLThunks.h"
 #include "FunctionConstructor.h"
 #include "GCActivityCallback.h"
+#include "GeneratorFrame.h"
 #include "GetterSetter.h"
 #include "Heap.h"
 #include "HeapIterationScope.h"
 #include "HostCallReturnValue.h"
 #include "Identifier.h"
 #include "IncrementalSweeper.h"
+#include "InferredTypeTable.h"
 #include "Interpreter.h"
+#include "JITCode.h"
 #include "JSAPIValueWrapper.h"
-#include "JSActivation.h"
 #include "JSArray.h"
+#include "JSCInlines.h"
 #include "JSFunction.h"
 #include "JSGlobalObjectFunctions.h"
+#include "JSInternalPromiseDeferred.h"
+#include "JSLexicalEnvironment.h"
 #include "JSLock.h"
-#include "JSNameScope.h"
 #include "JSNotAnObject.h"
 #include "JSPromiseDeferred.h"
-#include "JSPromiseReaction.h"
-#include "JSPropertyNameIterator.h"
+#include "JSPropertyNameEnumerator.h"
+#include "JSTemplateRegistryKey.h"
 #include "JSWithScope.h"
 #include "Lexer.h"
 #include "Lookup.h"
 #include "MapData.h"
+#include "NativeStdFunctionCell.h"
 #include "Nodes.h"
-#include "ParserArena.h"
+#include "Parser.h"
+#include "ProfilerDatabase.h"
+#include "PropertyMapHashTable.h"
 #include "RegExpCache.h"
 #include "RegExpObject.h"
+#include "RegisterAtOffsetList.h"
+#include "RuntimeType.h"
+#include "SamplingProfiler.h"
 #include "SimpleTypedArrayController.h"
 #include "SourceProviderCache.h"
+#include "StackVisitor.h"
 #include "StrictEvalActivation.h"
 #include "StrongInlines.h"
+#include "StructureInlines.h"
+#include "TypeProfiler.h"
+#include "TypeProfilerLog.h"
 #include "UnlinkedCodeBlock.h"
+#include "VMEntryScope.h"
+#include "Watchdog.h"
+#include "WeakGCMapInlines.h"
 #include "WeakMapData.h"
+#include <wtf/CurrentTime.h>
 #include <wtf/ProcessID.h>
 #include <wtf/RetainPtr.h>
 #include <wtf/StringPrintStream.h>
 #include <wtf/Threading.h>
 #include <wtf/WTFThreadData.h>
+#include <wtf/text/AtomicStringTable.h>
+#include <wtf/text/SymbolRegistry.h>
 
 #if ENABLE(DFG_JIT)
 #include "ConservativeRoots.h"
@@ -96,28 +120,6 @@ using namespace WTF;
 
 namespace JSC {
 
-extern const HashTable arrayConstructorTable;
-extern const HashTable arrayPrototypeTable;
-extern const HashTable booleanPrototypeTable;
-extern const HashTable jsonTable;
-extern const HashTable dataViewTable;
-extern const HashTable dateTable;
-extern const HashTable dateConstructorTable;
-extern const HashTable errorPrototypeTable;
-extern const HashTable globalObjectTable;
-extern const HashTable numberConstructorTable;
-extern const HashTable numberPrototypeTable;
-JS_EXPORTDATA extern const HashTable objectConstructorTable;
-extern const HashTable privateNamePrototypeTable;
-extern const HashTable regExpTable;
-extern const HashTable regExpConstructorTable;
-extern const HashTable regExpPrototypeTable;
-extern const HashTable stringConstructorTable;
-#if ENABLE(PROMISES)
-extern const HashTable promisePrototypeTable;
-extern const HashTable promiseConstructorTable;
-#endif
-
 // Note: Platform.h will enforce that ENABLE(ASSEMBLER) is true if either
 // ENABLE(JIT) or ENABLE(YARR_JIT) or both are enabled. The code below
 // just checks for ENABLE(JIT) or ENABLE(YARR_JIT) with this premise in mind.
@@ -134,20 +136,6 @@ static bool enableAssembler(ExecutableAllocator& executableAllocator)
         return false;
     }
 
-#if USE(CF)
-#if COMPILER(GCC) && !COMPILER(CLANG)
-    // FIXME: remove this once the EWS have been upgraded to LLVM.
-    // Work around a bug of GCC with strict-aliasing.
-    RetainPtr<CFStringRef> canUseJITKeyRetain = adoptCF(CFStringCreateWithCString(0 , "JavaScriptCoreUseJIT", kCFStringEncodingMacRoman));
-    CFStringRef canUseJITKey = canUseJITKeyRetain.get();
-#else
-    CFStringRef canUseJITKey = CFSTR("JavaScriptCoreUseJIT");
-#endif // COMPILER(GCC) && !COMPILER(CLANG)
-    RetainPtr<CFTypeRef> canUseJIT = adoptCF(CFPreferencesCopyAppValue(canUseJITKey, kCFPreferencesCurrentApplication));
-    if (canUseJIT)
-        return kCFBooleanTrue == canUseJIT.get();
-#endif
-
 #if USE(CF) || OS(UNIX)
     char* canUseJITString = getenv("JavaScriptCoreUseJIT");
     return !canUseJITString || atoi(canUseJITString);
@@ -165,33 +153,14 @@ VM::VM(VMType vmType, HeapType heapType)
     , heap(this, heapType)
     , vmType(vmType)
     , clientData(0)
+    , topVMEntryFrame(nullptr)
     , topCallFrame(CallFrame::noCaller())
-    , 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)))
-#endif
-    , identifierTable(vmType == Default ? wtfThreadData().currentIdentifierTable() : createIdentifierTable())
-    , propertyNames(new CommonIdentifiers(this))
+    , m_atomicStringTable(vmType == Default ? wtfThreadData().atomicStringTable() : new AtomicStringTable)
+    , propertyNames(nullptr)
     , emptyList(new MarkedArgumentBuffer)
-    , parserArena(adoptPtr(new ParserArena))
-    , keywords(adoptPtr(new Keywords(*this)))
+    , customGetterSetterFunctionMap(*this)
+    , stringCache(*this)
+    , prototypeMap(*this)
     , interpreter(0)
     , jsArrayClassInfo(JSArray::info())
     , jsFinalObjectClassInfo(JSFinalObject::info())
@@ -201,8 +170,6 @@ VM::VM(VMType vmType, HeapType heapType)
 #if ENABLE(REGEXP_TRACING)
     , m_rtTraceList(new RTTraceList())
 #endif
-    , exclusiveThread(0)
-    , m_newStringsSinceLastHashCons(0)
 #if ENABLE(ASSEMBLER)
     , m_canUseAssembler(enableAssembler(executableAllocator))
 #endif
@@ -215,29 +182,43 @@ VM::VM(VMType vmType, HeapType heapType)
 #if ENABLE(GC_VALIDATION)
     , m_initializingObjectClass(0)
 #endif
+    , m_stackPointerAtVMEntry(0)
     , m_stackLimit(0)
-#if USE(SEPARATE_C_AND_JS_STACK)
+#if !ENABLE(JIT)
     , m_jsStackLimit(0)
 #endif
+#if ENABLE(FTL_JIT)
+    , m_ftlStackLimit(0)
+    , m_largestFTLStackSize(0)
+#endif
     , m_inDefineOwnProperty(false)
-    , m_codeCache(CodeCache::create())
+    , 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();
-    setStackLimit(stack.recursionLimit());
+    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);
-    IdentifierTable* existingEntryIdentifierTable = wtfThreadData().setCurrentIdentifierTable(identifierTable);
+    AtomicStringTable* existingEntryAtomicStringTable = wtfThreadData().setCurrentAtomicStringTable(m_atomicStringTable);
+    propertyNames = new CommonIdentifiers(this);
     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()));
+    propertyNameEnumeratorStructure.set(*this, JSPropertyNameEnumerator::createStructure(*this, 0, jsNull()));
     getterSetterStructure.set(*this, GetterSetter::createStructure(*this, 0, jsNull()));
+    customGetterSetterStructure.set(*this, CustomGetterSetter::createStructure(*this, 0, jsNull()));
+    scopedArgumentsTableStructure.set(*this, ScopedArgumentsTable::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()));
@@ -245,84 +226,138 @@ VM::VM(VMType vmType, HeapType heapType)
     evalExecutableStructure.set(*this, EvalExecutable::createStructure(*this, 0, jsNull()));
     programExecutableStructure.set(*this, ProgramExecutable::createStructure(*this, 0, jsNull()));
     functionExecutableStructure.set(*this, FunctionExecutable::createStructure(*this, 0, jsNull()));
+#if ENABLE(WEBASSEMBLY)
+    webAssemblyExecutableStructure.set(*this, WebAssemblyExecutable::createStructure(*this, 0, jsNull()));
+#endif
+    moduleProgramExecutableStructure.set(*this, ModuleProgramExecutable::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()));
+    templateRegistryKeyStructure.set(*this, JSTemplateRegistryKey::createStructure(*this, 0, jsNull()));
     arrayBufferNeuteringWatchpointStructure.set(*this, ArrayBufferNeuteringWatchpoint::createStructure(*this));
-    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()));
+    unlinkedModuleProgramCodeBlockStructure.set(*this, UnlinkedModuleProgramCodeBlock::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()));
+    inferredValueStructure.set(*this, InferredValue::createStructure(*this, 0, jsNull()));
+    inferredTypeStructure.set(*this, InferredType::createStructure(*this, 0, jsNull()));
+    inferredTypeTableStructure.set(*this, InferredTypeTable::createStructure(*this, 0, jsNull()));
+    functionRareDataStructure.set(*this, FunctionRareData::createStructure(*this, 0, jsNull()));
+    generatorFrameStructure.set(*this, GeneratorFrame::createStructure(*this, 0, jsNull()));
+    exceptionStructure.set(*this, Exception::createStructure(*this, 0, jsNull()));
     promiseDeferredStructure.set(*this, JSPromiseDeferred::createStructure(*this, 0, jsNull()));
-    promiseReactionStructure.set(*this, JSPromiseReaction::createStructure(*this, 0, jsNull()));
+    internalPromiseDeferredStructure.set(*this, JSInternalPromiseDeferred::createStructure(*this, 0, jsNull()));
+    programCodeBlockStructure.set(*this, ProgramCodeBlock::createStructure(*this, 0, jsNull()));
+    moduleProgramCodeBlockStructure.set(*this, ModuleProgramCodeBlock::createStructure(*this, 0, jsNull()));
+    evalCodeBlockStructure.set(*this, EvalCodeBlock::createStructure(*this, 0, jsNull()));
+    functionCodeBlockStructure.set(*this, FunctionCodeBlock::createStructure(*this, 0, jsNull()));
+#if ENABLE(WEBASSEMBLY)
+    webAssemblyCodeBlockStructure.set(*this, WebAssemblyCodeBlock::createStructure(*this, 0, jsNull()));
+#endif
+
     iterationTerminator.set(*this, JSFinalObject::create(*this, JSFinalObject::createStructure(*this, 0, jsNull(), 1)));
+    nativeStdFunctionCellStructure.set(*this, NativeStdFunctionCell::createStructure(*this, 0, jsNull()));
     smallStrings.initializeCommonStrings(*this);
 
-    wtfThreadData().setCurrentIdentifierTable(existingEntryIdentifierTable);
+    wtfThreadData().setCurrentAtomicStringTable(existingEntryAtomicStringTable);
 
 #if ENABLE(JIT)
-    jitStubs = adoptPtr(new JITThunks());
+    jitStubs = std::make_unique<JITThunks>();
+    allCalleeSaveRegisterOffsets = std::make_unique<RegisterAtOffsetList>(RegisterSet::vmCalleeSaveRegisters(), RegisterAtOffsetList::ZeroBased);
 #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());
+    interpreter->initialize();
     
 #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));
+    if (Options::useProfiler()) {
+        m_perBytecodeProfiler = std::make_unique<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());
     }
 
+    callFrameForCatch = nullptr;
+
 #if ENABLE(DFG_JIT)
     if (canUseJIT())
-        dfgState = adoptPtr(new DFG::LongLivedState());
+        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());
+
+    m_bytecodeIntrinsicRegistry = std::make_unique<BytecodeIntrinsicRegistry>(*this);
+
+    if (Options::useTypeProfiler())
+        enableTypeProfiler();
+    if (Options::useControlFlowProfiler())
+        enableControlFlowProfiler();
+#if ENABLE(SAMPLING_PROFILER)
+    if (Options::useSamplingProfiler()) {
+        setShouldBuildPCToCodeOriginMapping();
+        m_samplingProfiler = adoptRef(new SamplingProfiler(*this, Stopwatch::create()));
+        m_samplingProfiler->start();
+    }
+#endif // ENABLE(SAMPLING_PROFILER)
+
+    if (Options::alwaysGeneratePCToCodeOriginMap())
+        setShouldBuildPCToCodeOriginMapping();
+
+    if (Options::watchdog()) {
+        std::chrono::milliseconds timeoutMillis(Options::watchdog());
+        Watchdog& watchdog = ensureWatchdog();
+        watchdog.setTimeLimit(timeoutMillis);
+    }
 }
 
 VM::~VM()
 {
     // Never GC, ever again.
     heap.incrementDeferralDepth();
+
+#if ENABLE(SAMPLING_PROFILER)
+    if (m_samplingProfiler)
+        m_samplingProfiler->shutdown();
+#endif // ENABLE(SAMPLING_PROFILER)
     
 #if ENABLE(DFG_JIT)
     // Make sure concurrent compilations are done, but don't install them, since there is
     // no point to doing so.
-    if (worklist) {
-        worklist->waitUntilAllPlansForVMAreReady(*this);
-        worklist->removeAllReadyPlansForVM(*this);
+    for (unsigned i = DFG::numberOfWorklists(); i--;) {
+        if (DFG::Worklist* worklist = DFG::worklistForIndexOrNull(i)) {
+            worklist->waitUntilAllPlansForVMAreReady(*this);
+            worklist->removeAllReadyPlansForVM(*this);
+        }
     }
 #endif // ENABLE(DFG_JIT)
     
-    // Clear this first to ensure that nobody tries to remove themselves from it.
-    m_perBytecodeProfiler.clear();
+    waitForAsynchronousDisassembly();
     
+    // Clear this first to ensure that nobody tries to remove themselves from it.
+    m_perBytecodeProfiler = nullptr;
+
     ASSERT(m_apiLock->currentThreadIsHoldingLock());
     m_apiLock->willDestroyVM(this);
     heap.lastChanceToFinalize();
@@ -332,33 +367,11 @@ VM::~VM()
     interpreter = reinterpret_cast<Interpreter*>(0xbbadbeef);
 #endif
 
-    arrayPrototypeTable->deleteTable();
-    arrayConstructorTable->deleteTable();
-    booleanPrototypeTable->deleteTable();
-    dataViewTable->deleteTable();
-    dateTable->deleteTable();
-    dateConstructorTable->deleteTable();
-    errorPrototypeTable->deleteTable();
-    globalObjectTable->deleteTable();
-    jsonTable->deleteTable();
-    numberConstructorTable->deleteTable();
-    numberPrototypeTable->deleteTable();
-    objectConstructorTable->deleteTable();
-    privateNamePrototypeTable->deleteTable();
-    regExpTable->deleteTable();
-    regExpConstructorTable->deleteTable();
-    regExpPrototypeTable->deleteTable();
-    stringConstructorTable->deleteTable();
-#if ENABLE(PROMISES)
-    promisePrototypeTable->deleteTable();
-    promiseConstructorTable->deleteTable();
-#endif
-
     delete emptyList;
 
     delete propertyNames;
     if (vmType != Default)
-        deleteIdentifierTable(identifierTable);
+        delete m_atomicStringTable;
 
     delete clientData;
     delete m_regExpCache;
@@ -372,17 +385,22 @@ VM::~VM()
 #endif
 }
 
-PassRefPtr<VM> VM::createContextGroup(HeapType heapType)
+void VM::setLastStackTop(void* lastStackTop)
+{ 
+    m_lastStackTop = lastStackTop;
+}
+
+Ref<VM> VM::createContextGroup(HeapType heapType)
 {
-    return adoptRef(new VM(APIContextGroup, heapType));
+    return adoptRef(*new VM(APIContextGroup, heapType));
 }
 
-PassRefPtr<VM> VM::create(HeapType heapType)
+Ref<VM> VM::create(HeapType heapType)
 {
-    return adoptRef(new VM(Default, heapType));
+    return adoptRef(*new VM(Default, heapType));
 }
 
-PassRefPtr<VM> VM::createLeaked(HeapType heapType)
+Ref<VM> VM::createLeaked(HeapType heapType)
 {
     return create(heapType);
 }
@@ -396,10 +414,8 @@ VM& VM::sharedInstance()
 {
     GlobalJSLock globalLock;
     VM*& instance = sharedInstanceInternal();
-    if (!instance) {
+    if (!instance)
         instance = adoptRef(new VM(APIShared, SmallHeap)).leakRef();
-        instance->makeUsableFromMultipleThreads();
-    }
     return *instance;
 }
 
@@ -409,6 +425,32 @@ VM*& VM::sharedInstanceInternal()
     return sharedInstance;
 }
 
+Watchdog& VM::ensureWatchdog()
+{
+    if (!m_watchdog) {
+        m_watchdog = adoptRef(new Watchdog());
+        
+        // The LLINT peeks into the Watchdog object directly. In order to do that,
+        // the LLINT assumes that the internal shape of a std::unique_ptr is the
+        // same as a plain C++ pointer, and loads the address of Watchdog from it.
+        RELEASE_ASSERT(*reinterpret_cast<Watchdog**>(&m_watchdog) == m_watchdog.get());
+
+        // And if we've previously compiled any functions, we need to revert
+        // them because they don't have the needed polling checks for the watchdog
+        // yet.
+        deleteAllCode();
+    }
+    return *m_watchdog;
+}
+
+#if ENABLE(SAMPLING_PROFILER)
+void VM::ensureSamplingProfiler(RefPtr<Stopwatch>&& stopwatch)
+{
+    if (!m_samplingProfiler)
+        m_samplingProfiler = adoptRef(new SamplingProfiler(*this, WTFMove(stopwatch)));
+}
+#endif // ENABLE(SAMPLING_PROFILER)
+
 #if ENABLE(JIT)
 static ThunkGenerator thunkGeneratorForIntrinsic(Intrinsic intrinsic)
 {
@@ -417,6 +459,8 @@ static ThunkGenerator thunkGeneratorForIntrinsic(Intrinsic intrinsic)
         return charCodeAtThunkGenerator;
     case CharAtIntrinsic:
         return charAtThunkGenerator;
+    case Clz32Intrinsic:
+        return clz32ThunkGenerator;
     case FromCharCodeIntrinsic:
         return fromCharCodeThunkGenerator;
     case SqrtIntrinsic:
@@ -437,33 +481,31 @@ static ThunkGenerator thunkGeneratorForIntrinsic(Intrinsic intrinsic)
         return logThunkGenerator;
     case IMulIntrinsic:
         return imulThunkGenerator;
-    case ArrayIteratorNextKeyIntrinsic:
-        return arrayIteratorNextKeyThunkGenerator;
-    case ArrayIteratorNextValueIntrinsic:
-        return arrayIteratorNextValueThunkGenerator;
+    case RandomIntrinsic:
+        return randomThunkGenerator;
     default:
         return 0;
     }
 }
 
-NativeExecutable* VM::getHostFunction(NativeFunction function, NativeFunction constructor)
+NativeExecutable* VM::getHostFunction(NativeFunction function, NativeFunction constructor, const String& name)
 {
-    return jitStubs->hostFunctionStub(this, function, constructor);
+    return jitStubs->hostFunctionStub(this, function, constructor, name);
 }
-NativeExecutable* VM::getHostFunction(NativeFunction function, Intrinsic intrinsic)
+NativeExecutable* VM::getHostFunction(NativeFunction function, Intrinsic intrinsic, const String& name)
 {
     ASSERT(canUseJIT());
-    return jitStubs->hostFunctionStub(this, function, intrinsic != NoIntrinsic ? thunkGeneratorForIntrinsic(intrinsic) : 0, intrinsic);
+    return jitStubs->hostFunctionStub(this, function, intrinsic != NoIntrinsic ? thunkGeneratorForIntrinsic(intrinsic) : 0, intrinsic, name);
 }
 
 #else // !ENABLE(JIT)
 
-NativeExecutable* VM::getHostFunction(NativeFunction function, NativeFunction constructor)
+NativeExecutable* VM::getHostFunction(NativeFunction function, NativeFunction constructor, const String& name)
 {
     return NativeExecutable::create(*this,
-        MacroAssemblerCodeRef::createLLIntCodeRef(llint_native_call_trampoline), function,
-        MacroAssemblerCodeRef::createLLIntCodeRef(llint_native_construct_trampoline), constructor,
-        NoIntrinsic);
+        adoptRef(new NativeJITCode(MacroAssemblerCodeRef::createLLIntCodeRef(llint_native_call_trampoline), JITCode::HostCallThunk)), function,
+        adoptRef(new NativeJITCode(MacroAssemblerCodeRef::createLLIntCodeRef(llint_native_construct_trampoline), JITCode::HostCallThunk)), constructor,
+        NoIntrinsic, name);
 }
 
 #endif // !ENABLE(JIT)
@@ -476,7 +518,7 @@ void VM::resetDateCache()
 {
     localTimeOffsetCache.reset();
     cachedDateString = String();
-    cachedDateStringValue = QNaN;
+    cachedDateStringValue = std::numeric_limits<double>::quiet_NaN();
     dateInstanceCache.reset();
 }
 
@@ -490,22 +532,33 @@ void VM::stopSampling()
     interpreter->stopSampling();
 }
 
-void VM::prepareToDiscardCode()
+void VM::whenIdle(std::function<void()> callback)
 {
-#if ENABLE(DFG_JIT)
-    if (!worklist)
+    if (!entryScope) {
+        callback();
         return;
-    
-    worklist->completeAllPlansForVM(*this);
-#endif
+    }
+
+    entryScope->addDidPopListener(callback);
 }
 
-void VM::discardAllCode()
+void VM::deleteAllLinkedCode()
 {
-    prepareToDiscardCode();
-    m_codeCache->clear();
-    heap.deleteAllCompiledCode();
-    heap.reportAbandonedObjectGraph();
+    whenIdle([this]() {
+        heap.deleteAllCodeBlocks();
+        heap.reportAbandonedObjectGraph();
+    });
+}
+
+void VM::deleteAllCode()
+{
+    whenIdle([this]() {
+        m_codeCache->clear();
+        m_regExpCache->deleteAllCode();
+        heap.deleteAllCodeBlocks();
+        heap.deleteAllUnlinkedCodeBlocks();
+        heap.reportAbandonedObjectGraph();
+    });
 }
 
 void VM::dumpSampleData(ExecState* exec)
@@ -529,187 +582,115 @@ void VM::clearSourceProviderCaches()
     sourceProviderCacheMap.clear();
 }
 
-struct StackPreservingRecompiler : public MarkedBlock::VoidFunctor {
-    HashSet<FunctionExecutable*> currentlyExecutingFunctions;
-    void operator()(JSCell* cell)
-    {
-        if (!cell->inherits(FunctionExecutable::info()))
-            return;
-        FunctionExecutable* executable = jsCast<FunctionExecutable*>(cell);
-        if (currentlyExecutingFunctions.contains(executable))
-            return;
-        executable->clearCodeIfNotCompiling();
-    }
-};
-
-void VM::releaseExecutableMemory()
+void VM::throwException(ExecState* exec, Exception* exception)
 {
-    prepareToDiscardCode();
-    
-    if (entryScope) {
-        StackPreservingRecompiler recompiler;
-        HeapIterationScope iterationScope(heap);
-        HashSet<JSCell*> roots;
-        heap.getConservativeRegisterRoots(roots);
-        HashSet<JSCell*>::iterator end = roots.end();
-        for (HashSet<JSCell*>::iterator ptr = roots.begin(); ptr != end; ++ptr) {
-            ScriptExecutable* executable = 0;
-            JSCell* cell = *ptr;
-            if (cell->inherits(ScriptExecutable::info()))
-                executable = static_cast<ScriptExecutable*>(*ptr);
-            else if (cell->inherits(JSFunction::info())) {
-                JSFunction* function = jsCast<JSFunction*>(*ptr);
-                if (function->isHostFunction())
-                    continue;
-                executable = function->jsExecutable();
-            } else
-                continue;
-            ASSERT(executable->inherits(ScriptExecutable::info()));
-            executable->unlinkCalls();
-            if (executable->inherits(FunctionExecutable::info()))
-                recompiler.currentlyExecutingFunctions.add(static_cast<FunctionExecutable*>(executable));
-                
-        }
-        heap.objectSpace().forEachLiveCell<StackPreservingRecompiler>(iterationScope, recompiler);
+    if (Options::breakOnThrow()) {
+        dataLog("In call frame ", RawPointer(exec), " for code block ", *exec->codeBlock(), "\n");
+        CRASH();
     }
-    m_regExpCache->invalidateCode();
-    heap.collectAllGarbage();
-}
 
-static void appendSourceToError(CallFrame* callFrame, ErrorInstance* exception, unsigned bytecodeOffset)
-{
-    exception->clearAppendSourceToMessage();
-    
-    if (!callFrame->codeBlock()->hasExpressionInfo())
-        return;
-    
-    int startOffset = 0;
-    int endOffset = 0;
-    int divotPoint = 0;
-    unsigned line = 0;
-    unsigned column = 0;
-    
-    CodeBlock* codeBlock = callFrame->codeBlock();
-    codeBlock->expressionRangeForBytecodeOffset(bytecodeOffset, divotPoint, startOffset, endOffset, line, column);
-    
-    int expressionStart = divotPoint - startOffset;
-    int expressionStop = divotPoint + endOffset;
-    
-    const String& sourceString = codeBlock->source()->source();
-    if (!expressionStop || expressionStart > static_cast<int>(sourceString.length()))
-        return;
-    
-    VM* vm = &callFrame->vm();
-    JSValue jsMessage = exception->getDirect(*vm, vm->propertyNames->message);
-    if (!jsMessage || !jsMessage.isString())
-        return;
-    
-    String message = asString(jsMessage)->value(callFrame);
-    
-    if (expressionStart < expressionStop)
-        message =  makeString(message, " (evaluating '", codeBlock->source()->getRange(expressionStart, expressionStop), "')");
-    else {
-        // No range information, so give a few characters of context.
-        const StringImpl* data = sourceString.impl();
-        int dataLength = sourceString.length();
-        int start = expressionStart;
-        int stop = expressionStart;
-        // Get up to 20 characters of context to the left and right of the divot, clamping to the line.
-        // Then strip whitespace.
-        while (start > 0 && (expressionStart - start < 20) && (*data)[start - 1] != '\n')
-            start--;
-        while (start < (expressionStart - 1) && isStrWhiteSpace((*data)[start]))
-            start++;
-        while (stop < dataLength && (stop - expressionStart < 20) && (*data)[stop] != '\n')
-            stop++;
-        while (stop > expressionStart && isStrWhiteSpace((*data)[stop - 1]))
-            stop--;
-        message = makeString(message, " (near '...", codeBlock->source()->getRange(start, stop), "...')");
-    }
-    
-    exception->putDirect(*vm, vm->propertyNames->message, jsString(vm, message));
+    ASSERT(exec == topCallFrame || exec == exec->lexicalGlobalObject()->globalExec() || exec == exec->vmEntryGlobalObject()->globalExec());
+
+    interpreter->notifyDebuggerOfExceptionToBeThrown(exec, exception);
+
+    setException(exception);
 }
-    
-JSValue VM::throwException(ExecState* exec, JSValue error)
+
+JSValue VM::throwException(ExecState* exec, JSValue thrownValue)
 {
-    ASSERT(exec == topCallFrame || exec == exec->lexicalGlobalObject()->globalExec() || exec == exec->vmEntryGlobalObject()->globalExec());
-    
-    Vector<StackFrame> stackTrace;
-    interpreter->getStackTrace(stackTrace);
-    m_exceptionStack = RefCountedArray<StackFrame>(stackTrace);
-    m_exception = error;
-    
-    if (stackTrace.isEmpty() || !error.isObject())
-        return error;
-    JSObject* exception = asObject(error);
-    
-    StackFrame stackFrame;
-    for (unsigned i = 0 ; i < stackTrace.size(); ++i) {
-        stackFrame = stackTrace.at(i);
-        if (stackFrame.bytecodeOffset)
-            break;
-    }
-    unsigned bytecodeOffset = stackFrame.bytecodeOffset;
-    if (!hasErrorInfo(exec, exception)) {
-        // FIXME: We should only really be adding these properties to VM generated exceptions,
-        // but the inspector currently requires these for all thrown objects.
-        unsigned line;
-        unsigned column;
-        stackFrame.computeLineAndColumn(line, column);
-        exception->putDirect(*this, Identifier(this, "line"), jsNumber(line), ReadOnly | DontDelete);
-        exception->putDirect(*this, Identifier(this, "column"), jsNumber(column), ReadOnly | DontDelete);
-        if (!stackFrame.sourceURL.isEmpty())
-            exception->putDirect(*this, Identifier(this, "sourceURL"), jsString(this, stackFrame.sourceURL), ReadOnly | DontDelete);
-    }
-    if (exception->isErrorInstance() && static_cast<ErrorInstance*>(exception)->appendSourceToMessage()) {
-        unsigned stackIndex = 0;
-        CallFrame* callFrame;
-        for (callFrame = exec; callFrame && !callFrame->codeBlock(); ) {
-            stackIndex++;
-            callFrame = callFrame->callerFrameSkippingVMEntrySentinel();
-        }
-        if (callFrame && callFrame->codeBlock()) {
-            stackFrame = stackTrace.at(stackIndex);
-            bytecodeOffset = stackFrame.bytecodeOffset;
-            appendSourceToError(callFrame, static_cast<ErrorInstance*>(exception), bytecodeOffset);
-        }
-    }
+    Exception* exception = jsDynamicCast<Exception*>(thrownValue);
+    if (!exception)
+        exception = Exception::create(*this, thrownValue);
 
-    if (exception->hasProperty(exec, this->propertyNames->stack))
-        return error;
-    
-    exception->putDirect(*this, propertyNames->stack, interpreter->stackTraceAsString(topCallFrame, stackTrace), DontEnum);
-    return error;
+    throwException(exec, exception);
+    return JSValue(exception);
 }
-    
+
 JSObject* VM::throwException(ExecState* exec, JSObject* error)
 {
     return asObject(throwException(exec, JSValue(error)));
 }
-void VM::getExceptionInfo(JSValue& exception, RefCountedArray<StackFrame>& exceptionStack)
+
+void VM::setStackPointerAtVMEntry(void* sp)
 {
-    exception = m_exception;
-    exceptionStack = m_exceptionStack;
+    m_stackPointerAtVMEntry = sp;
+    updateStackLimit();
 }
-void VM::setExceptionInfo(JSValue& exception, RefCountedArray<StackFrame>& exceptionStack)
+
+size_t VM::updateReservedZoneSize(size_t reservedZoneSize)
 {
-    m_exception = exception;
-    m_exceptionStack = exceptionStack;
+    size_t oldReservedZoneSize = m_reservedZoneSize;
+    m_reservedZoneSize = reservedZoneSize;
+
+    updateStackLimit();
+
+    return oldReservedZoneSize;
 }
 
-void VM::clearException()
+#if PLATFORM(WIN)
+// On Windows the reserved stack space consists of committed memory, a guard page, and uncommitted memory,
+// where the guard page is a barrier between committed and uncommitted memory.
+// When data from the guard page is read or written, the guard page is moved, and memory is committed.
+// This is how the system grows the stack.
+// When using the C stack on Windows we need to precommit the needed stack space.
+// Otherwise we might crash later if we access uncommitted stack memory.
+// This can happen if we allocate stack space larger than the page guard size (4K).
+// The system does not get the chance to move the guard page, and commit more memory,
+// and we crash if uncommitted memory is accessed.
+// The MSVC compiler fixes this by inserting a call to the _chkstk() function,
+// when needed, see http://support.microsoft.com/kb/100775.
+// By touching every page up to the stack limit with a dummy operation,
+// we force the system to move the guard page, and commit memory.
+
+static void preCommitStackMemory(void* stackLimit)
 {
-    m_exception = JSValue();
+    const int pageSize = 4096;
+    for (volatile char* p = reinterpret_cast<char*>(&stackLimit); p > stackLimit; p -= pageSize) {
+        char ch = *p;
+        *p = ch;
+    }
 }
-void VM:: clearExceptionStack()
+#endif
+
+inline void VM::updateStackLimit()
 {
-    m_exceptionStack = RefCountedArray<StackFrame>();
+#if PLATFORM(WIN)
+    void* lastStackLimit = m_stackLimit;
+#endif
+
+    if (m_stackPointerAtVMEntry) {
+        ASSERT(wtfThreadData().stack().isGrowingDownward());
+        char* startOfStack = reinterpret_cast<char*>(m_stackPointerAtVMEntry);
+#if ENABLE(FTL_JIT)
+        m_stackLimit = wtfThreadData().stack().recursionLimit(startOfStack, Options::maxPerThreadStackUsage(), m_reservedZoneSize + m_largestFTLStackSize);
+        m_ftlStackLimit = wtfThreadData().stack().recursionLimit(startOfStack, Options::maxPerThreadStackUsage(), m_reservedZoneSize + 2 * m_largestFTLStackSize);
+#else
+        m_stackLimit = wtfThreadData().stack().recursionLimit(startOfStack, Options::maxPerThreadStackUsage(), m_reservedZoneSize);
+#endif
+    } else {
+#if ENABLE(FTL_JIT)
+        m_stackLimit = wtfThreadData().stack().recursionLimit(m_reservedZoneSize + m_largestFTLStackSize);
+        m_ftlStackLimit = wtfThreadData().stack().recursionLimit(m_reservedZoneSize + 2 * m_largestFTLStackSize);
+#else
+        m_stackLimit = wtfThreadData().stack().recursionLimit(m_reservedZoneSize);
+#endif
+    }
+
+#if PLATFORM(WIN)
+    if (lastStackLimit != m_stackLimit)
+        preCommitStackMemory(m_stackLimit);
+#endif
 }
 
-void releaseExecutableMemory(VM& vm)
+#if ENABLE(FTL_JIT)
+void VM::updateFTLLargestStackSize(size_t stackSize)
 {
-    vm.releaseExecutableMemory();
+    if (stackSize > m_largestFTLStackSize) {
+        m_largestFTLStackSize = stackSize;
+        updateStackLimit();
+    }
 }
+#endif
 
 #if ENABLE(DFG_JIT)
 void VM::gatherConservativeRoots(ConservativeRoots& conservativeRoots)
@@ -722,20 +703,24 @@ void VM::gatherConservativeRoots(ConservativeRoots& conservativeRoots)
         }
     }
 }
+#endif
 
-DFG::Worklist* VM::ensureWorklist()
+void logSanitizeStack(VM* vm)
 {
-    if (!DFG::enableConcurrentJIT())
-        return 0;
-    if (!worklist)
-        worklist = DFG::globalWorklist();
-    return worklist.get();
+    if (Options::verboseSanitizeStack() && vm->topCallFrame) {
+        int dummy;
+        dataLog(
+            "Sanitizing stack with top call frame at ", RawPointer(vm->topCallFrame),
+            ", current stack pointer at ", RawPointer(&dummy), ", in ",
+            pointerDump(vm->topCallFrame->codeBlock()), " and last code origin = ",
+            vm->topCallFrame->codeOrigin(), "\n");
+    }
 }
-#endif
 
 #if ENABLE(REGEXP_TRACING)
 void VM::addRegExpToTrace(RegExp* regExp)
 {
+    gcProtect(regExp);
     m_rtTraceList->add(regExp);
 }
 
@@ -746,14 +731,16 @@ void VM::dumpRegExpTrace()
     
     if (iter != m_rtTraceList->end()) {
         dataLogF("\nRegExp Tracing\n");
-        dataLogF("                                                            match()    matches\n");
-        dataLogF("Regular Expression                          JIT Address      calls      found\n");
-        dataLogF("----------------------------------------+----------------+----------+----------\n");
+        dataLogF("Regular Expression                              8 Bit          16 Bit        match()    Matches    Average\n");
+        dataLogF(" <Match only / Match>                         JIT Addr      JIT Address       calls      found   String len\n");
+        dataLogF("----------------------------------------+----------------+----------------+----------+----------+-----------\n");
     
         unsigned reCount = 0;
     
-        for (; iter != m_rtTraceList->end(); ++iter, ++reCount)
+        for (; iter != m_rtTraceList->end(); ++iter, ++reCount) {
             (*iter)->printTraceData();
+            gcUnprotect(*iter);
+        }
 
         dataLogF("%d Regular Expressions\n", reCount);
     }
@@ -777,15 +764,15 @@ void VM::registerWatchpointForImpureProperty(const Identifier& propertyName, Wat
 void VM::addImpureProperty(const String& propertyName)
 {
     if (RefPtr<WatchpointSet> watchpointSet = m_impurePropertyWatchpointSets.take(propertyName))
-        watchpointSet->fireAll();
+        watchpointSet->fireAll("Impure property added");
 }
 
 class SetEnabledProfilerFunctor {
 public:
     bool operator()(CodeBlock* codeBlock)
     {
-        if (codeBlock->jitType() == JITCode::DFGJIT)
-            codeBlock->jettison();
+        if (JITCode::isOptimizingJIT(codeBlock->jitType()))
+            codeBlock->jettison(Profiler::JettisonDueToLegacyProfiler);
         return false;
     }
 };
@@ -799,4 +786,102 @@ void VM::setEnabledProfiler(LegacyProfiler* profiler)
     }
 }
 
+static bool enableProfilerWithRespectToCount(unsigned& counter, std::function<void()> doEnableWork)
+{
+    bool needsToRecompile = false;
+    if (!counter) {
+        doEnableWork();
+        needsToRecompile = true;
+    }
+    counter++;
+
+    return needsToRecompile;
+}
+
+static bool disableProfilerWithRespectToCount(unsigned& counter, std::function<void()> doDisableWork)
+{
+    RELEASE_ASSERT(counter > 0);
+    bool needsToRecompile = false;
+    counter--;
+    if (!counter) {
+        doDisableWork();
+        needsToRecompile = true;
+    }
+
+    return needsToRecompile;
+}
+
+bool VM::enableTypeProfiler()
+{
+    auto enableTypeProfiler = [this] () {
+        this->m_typeProfiler = std::make_unique<TypeProfiler>();
+        this->m_typeProfilerLog = std::make_unique<TypeProfilerLog>();
+    };
+
+    return enableProfilerWithRespectToCount(m_typeProfilerEnabledCount, enableTypeProfiler);
+}
+
+bool VM::disableTypeProfiler()
+{
+    auto disableTypeProfiler = [this] () {
+        this->m_typeProfiler.reset(nullptr);
+        this->m_typeProfilerLog.reset(nullptr);
+    };
+
+    return disableProfilerWithRespectToCount(m_typeProfilerEnabledCount, disableTypeProfiler);
+}
+
+bool VM::enableControlFlowProfiler()
+{
+    auto enableControlFlowProfiler = [this] () {
+        this->m_controlFlowProfiler = std::make_unique<ControlFlowProfiler>();
+    };
+
+    return enableProfilerWithRespectToCount(m_controlFlowProfilerEnabledCount, enableControlFlowProfiler);
+}
+
+bool VM::disableControlFlowProfiler()
+{
+    auto disableControlFlowProfiler = [this] () {
+        this->m_controlFlowProfiler.reset(nullptr);
+    };
+
+    return disableProfilerWithRespectToCount(m_controlFlowProfilerEnabledCount, disableControlFlowProfiler);
+}
+
+void VM::dumpTypeProfilerData()
+{
+    if (!typeProfiler())
+        return;
+
+    typeProfilerLog()->processLogEntries(ASCIILiteral("VM Dump Types"));
+    typeProfiler()->dumpTypeProfilerData(*this);
+}
+
+void VM::queueMicrotask(JSGlobalObject* globalObject, PassRefPtr<Microtask> task)
+{
+    m_microtaskQueue.append(std::make_unique<QueuedTask>(*this, globalObject, task));
+}
+
+void VM::drainMicrotasks()
+{
+    while (!m_microtaskQueue.isEmpty())
+        m_microtaskQueue.takeFirst()->run();
+}
+
+void QueuedTask::run()
+{
+    m_microtask->run(m_globalObject->globalExec());
+}
+
+void sanitizeStackForVM(VM* vm)
+{
+    logSanitizeStack(vm);
+#if !ENABLE(JIT)
+    vm->interpreter->stack().sanitizeStack();
+#else
+    sanitizeStackForVMImpl(vm);
+#endif
+}
+
 } // namespace JSC