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VM.h
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VM.h
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/*
* Copyright (C) 2008-2017 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.
* 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "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 OR ITS 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.
*/
#pragma once
#include "CallData.h"
#include "ConcurrentJSLock.h"
#include "ControlFlowProfiler.h"
#include "DateInstanceCache.h"
#include "DeleteAllCodeEffort.h"
#include "ExceptionEventLocation.h"
#include "ExecutableAllocator.h"
#include "FunctionHasExecutedCache.h"
#include "Heap.h"
#include "Intrinsic.h"
#include "JITThunks.h"
#include "JSCJSValue.h"
#include "JSDestructibleObjectSubspace.h"
#include "JSLock.h"
#include "JSSegmentedVariableObjectSubspace.h"
#include "JSStringSubspace.h"
#include "JSWebAssemblyCodeBlockSubspace.h"
#include "MacroAssemblerCodeRef.h"
#include "Microtask.h"
#include "NumericStrings.h"
#include "PrototypeMap.h"
#include "SmallStrings.h"
#include "Strong.h"
#include "Subspace.h"
#include "TemplateRegistryKeyTable.h"
#include "VMEntryRecord.h"
#include "VMTraps.h"
#include "Watchpoint.h"
#include <wtf/BumpPointerAllocator.h>
#include <wtf/CheckedArithmetic.h>
#include <wtf/DateMath.h>
#include <wtf/Deque.h>
#include <wtf/DoublyLinkedList.h>
#include <wtf/Forward.h>
#include <wtf/Gigacage.h>
#include <wtf/HashMap.h>
#include <wtf/HashSet.h>
#include <wtf/StackBounds.h>
#include <wtf/Stopwatch.h>
#include <wtf/ThreadSafeRefCounted.h>
#include <wtf/ThreadSpecific.h>
#include <wtf/text/SymbolRegistry.h>
#include <wtf/text/WTFString.h>
#if ENABLE(REGEXP_TRACING)
#include <wtf/ListHashSet.h>
#endif
#if ENABLE(EXCEPTION_SCOPE_VERIFICATION)
#include <wtf/StackTrace.h>
#endif
namespace WTF {
class SimpleStats;
} // namespace WTF
using WTF::SimpleStats;
namespace JSC {
class BuiltinExecutables;
class BytecodeIntrinsicRegistry;
class CodeBlock;
class CodeCache;
class CommonIdentifiers;
class CustomGetterSetter;
class DOMAttributeGetterSetter;
class ExecState;
class Exception;
class ExceptionScope;
class FastMallocAlignedMemoryAllocator;
class GigacageAlignedMemoryAllocator;
class HandleStack;
class TypeProfiler;
class TypeProfilerLog;
class HasOwnPropertyCache;
class HeapProfiler;
class Identifier;
class Interpreter;
class JSCustomGetterSetterFunction;
class JSGlobalObject;
class JSObject;
class JSRunLoopTimer;
class JSWebAssemblyInstance;
class LLIntOffsetsExtractor;
class NativeExecutable;
class PromiseDeferredTimer;
class RegExpCache;
class Register;
class RegisterAtOffsetList;
#if ENABLE(SAMPLING_PROFILER)
class SamplingProfiler;
#endif
class ShadowChicken;
class ScriptExecutable;
class SourceProvider;
class SourceProviderCache;
class StackFrame;
class Structure;
#if ENABLE(REGEXP_TRACING)
class RegExp;
#endif
class Symbol;
class TypedArrayController;
class UnlinkedCodeBlock;
class UnlinkedEvalCodeBlock;
class UnlinkedFunctionExecutable;
class UnlinkedProgramCodeBlock;
class UnlinkedModuleProgramCodeBlock;
class VirtualRegister;
class VMEntryScope;
class Watchdog;
class Watchpoint;
class WatchpointSet;
#if ENABLE(FTL_JIT)
namespace FTL {
class Thunks;
}
#endif // ENABLE(FTL_JIT)
namespace CommonSlowPaths {
struct ArityCheckData;
}
namespace Profiler {
class Database;
}
namespace DOMJIT {
class Signature;
}
struct HashTable;
struct Instruction;
struct LocalTimeOffsetCache {
LocalTimeOffsetCache()
: start(0.0)
, end(-1.0)
, increment(0.0)
, timeType(WTF::UTCTime)
{
}
void reset()
{
offset = LocalTimeOffset();
start = 0.0;
end = -1.0;
increment = 0.0;
timeType = WTF::UTCTime;
}
LocalTimeOffset offset;
double start;
double end;
double increment;
WTF::TimeType timeType;
};
class QueuedTask {
WTF_MAKE_NONCOPYABLE(QueuedTask);
WTF_MAKE_FAST_ALLOCATED;
public:
void run();
QueuedTask(VM& vm, JSGlobalObject* globalObject, Ref<Microtask>&& microtask)
: m_globalObject(vm, globalObject)
, m_microtask(WTFMove(microtask))
{
}
private:
Strong<JSGlobalObject> m_globalObject;
Ref<Microtask> m_microtask;
};
class ConservativeRoots;
#if COMPILER(MSVC)
#pragma warning(push)
#pragma warning(disable: 4200) // Disable "zero-sized array in struct/union" warning
#endif
struct ScratchBuffer {
ScratchBuffer()
{
u.m_activeLength = 0;
}
static ScratchBuffer* create(size_t size)
{
ScratchBuffer* result = new (fastMalloc(ScratchBuffer::allocationSize(size))) ScratchBuffer;
return result;
}
static size_t allocationSize(Checked<size_t> bufferSize) { return (sizeof(ScratchBuffer) + bufferSize).unsafeGet(); }
void setActiveLength(size_t activeLength) { u.m_activeLength = activeLength; }
size_t activeLength() const { return u.m_activeLength; };
size_t* addressOfActiveLength() { return &u.m_activeLength; };
void* dataBuffer() { return m_buffer; }
union {
size_t m_activeLength;
double pad; // Make sure m_buffer is double aligned.
} u;
#if CPU(MIPS) && (defined WTF_MIPS_ARCH_REV && WTF_MIPS_ARCH_REV == 2)
void* m_buffer[0] __attribute__((aligned(8)));
#else
void* m_buffer[0];
#endif
};
#if COMPILER(MSVC)
#pragma warning(pop)
#endif
class VM : public ThreadSafeRefCounted<VM>, public DoublyLinkedListNode<VM> {
public:
// WebCore has a one-to-one mapping of threads to VMs;
// either create() or createLeaked() should only be called once
// on a thread, this is the 'default' VM (it uses the
// thread's default string uniquing table from Thread::current()).
// API contexts created using the new context group aware interface
// create APIContextGroup objects which require less locking of JSC
// than the old singleton APIShared VM created for use by
// the original API.
enum VMType { Default, APIContextGroup, APIShared };
struct ClientData {
JS_EXPORT_PRIVATE virtual ~ClientData() = 0;
};
bool isSharedInstance() { return vmType == APIShared; }
bool usingAPI() { return vmType != Default; }
JS_EXPORT_PRIVATE static bool sharedInstanceExists();
JS_EXPORT_PRIVATE static VM& sharedInstance();
JS_EXPORT_PRIVATE static Ref<VM> create(HeapType = SmallHeap);
JS_EXPORT_PRIVATE static Ref<VM> createLeaked(HeapType = SmallHeap);
static Ref<VM> createContextGroup(HeapType = SmallHeap);
JS_EXPORT_PRIVATE ~VM();
Watchdog& ensureWatchdog();
Watchdog* watchdog() { return m_watchdog.get(); }
HeapProfiler* heapProfiler() const { return m_heapProfiler.get(); }
JS_EXPORT_PRIVATE HeapProfiler& ensureHeapProfiler();
#if ENABLE(SAMPLING_PROFILER)
SamplingProfiler* samplingProfiler() { return m_samplingProfiler.get(); }
JS_EXPORT_PRIVATE SamplingProfiler& ensureSamplingProfiler(RefPtr<Stopwatch>&&);
#endif
private:
RefPtr<JSLock> m_apiLock;
#if USE(CF)
// These need to be initialized before heap below.
HashSet<JSRunLoopTimer*> m_runLoopTimers;
RetainPtr<CFRunLoopRef> m_runLoop;
#endif
public:
Heap heap;
std::unique_ptr<FastMallocAlignedMemoryAllocator> fastMallocAllocator;
std::unique_ptr<GigacageAlignedMemoryAllocator> primitiveGigacageAllocator;
std::unique_ptr<GigacageAlignedMemoryAllocator> jsValueGigacageAllocator;
Subspace primitiveGigacageAuxiliarySpace; // Typed arrays, strings, bitvectors, etc go here.
Subspace jsValueGigacageAuxiliarySpace; // Butterflies, arrays of JSValues, etc go here.
// We make cross-cutting assumptions about typed arrays being in the primitive Gigacage and butterflies
// being in the JSValue gigacage. For some types, it's super obvious where they should go, and so we
// can hardcode that fact. But sometimes it's not clear, so we abstract it by having a Gigacage::Kind
// constant somewhere.
// FIXME: Maybe it would be better if everyone abstracted this?
// https://bugs.webkit.org/show_bug.cgi?id=175248
ALWAYS_INLINE Subspace& gigacageAuxiliarySpace(Gigacage::Kind kind)
{
switch (kind) {
case Gigacage::Primitive:
return primitiveGigacageAuxiliarySpace;
case Gigacage::JSValue:
return jsValueGigacageAuxiliarySpace;
}
RELEASE_ASSERT_NOT_REACHED();
return primitiveGigacageAuxiliarySpace;
}
// Whenever possible, use subspaceFor<CellType>(vm) to get one of these subspaces.
Subspace cellSpace;
Subspace destructibleCellSpace;
JSStringSubspace stringSpace;
JSDestructibleObjectSubspace destructibleObjectSpace;
JSDestructibleObjectSubspace eagerlySweptDestructibleObjectSpace;
JSSegmentedVariableObjectSubspace segmentedVariableObjectSpace;
#if ENABLE(WEBASSEMBLY)
JSWebAssemblyCodeBlockSubspace webAssemblyCodeBlockSpace;
#endif
VMType vmType;
ClientData* clientData;
VMEntryFrame* topVMEntryFrame;
// NOTE: When throwing an exception while rolling back the call frame, this may be equal to
// topVMEntryFrame.
// FIXME: This should be a void*, because it might not point to a CallFrame.
// https://bugs.webkit.org/show_bug.cgi?id=160441
ExecState* topCallFrame { nullptr };
// FIXME: Save this state elsewhere to allow PIC. https://bugs.webkit.org/show_bug.cgi?id=169773
JSWebAssemblyInstance* wasmContext { nullptr };
Strong<Structure> structureStructure;
Strong<Structure> structureRareDataStructure;
Strong<Structure> terminatedExecutionErrorStructure;
Strong<Structure> stringStructure;
Strong<Structure> propertyNameIteratorStructure;
Strong<Structure> propertyNameEnumeratorStructure;
Strong<Structure> customGetterSetterStructure;
Strong<Structure> domAttributeGetterSetterStructure;
Strong<Structure> scopedArgumentsTableStructure;
Strong<Structure> apiWrapperStructure;
Strong<Structure> nativeExecutableStructure;
Strong<Structure> evalExecutableStructure;
Strong<Structure> programExecutableStructure;
Strong<Structure> functionExecutableStructure;
#if ENABLE(WEBASSEMBLY)
Strong<Structure> webAssemblyCodeBlockStructure;
#endif
Strong<Structure> moduleProgramExecutableStructure;
Strong<Structure> regExpStructure;
Strong<Structure> symbolStructure;
Strong<Structure> symbolTableStructure;
Strong<Structure> fixedArrayStructure;
Strong<Structure> sourceCodeStructure;
Strong<Structure> scriptFetcherStructure;
Strong<Structure> structureChainStructure;
Strong<Structure> sparseArrayValueMapStructure;
Strong<Structure> templateRegistryKeyStructure;
Strong<Structure> arrayBufferNeuteringWatchpointStructure;
Strong<Structure> unlinkedFunctionExecutableStructure;
Strong<Structure> unlinkedProgramCodeBlockStructure;
Strong<Structure> unlinkedEvalCodeBlockStructure;
Strong<Structure> unlinkedFunctionCodeBlockStructure;
Strong<Structure> unlinkedModuleProgramCodeBlockStructure;
Strong<Structure> propertyTableStructure;
Strong<Structure> inferredValueStructure;
Strong<Structure> inferredTypeStructure;
Strong<Structure> inferredTypeTableStructure;
Strong<Structure> functionRareDataStructure;
Strong<Structure> exceptionStructure;
Strong<Structure> promiseDeferredStructure;
Strong<Structure> internalPromiseDeferredStructure;
Strong<Structure> nativeStdFunctionCellStructure;
Strong<Structure> programCodeBlockStructure;
Strong<Structure> moduleProgramCodeBlockStructure;
Strong<Structure> evalCodeBlockStructure;
Strong<Structure> functionCodeBlockStructure;
Strong<Structure> hashMapBucketSetStructure;
Strong<Structure> hashMapBucketMapStructure;
Strong<JSCell> emptyPropertyNameEnumerator;
std::unique_ptr<PromiseDeferredTimer> promiseDeferredTimer;
JSCell* currentlyDestructingCallbackObject;
const ClassInfo* currentlyDestructingCallbackObjectClassInfo;
AtomicStringTable* m_atomicStringTable;
WTF::SymbolRegistry m_symbolRegistry;
TemplateRegistryKeyTable m_templateRegistryKeytable;
CommonIdentifiers* propertyNames;
const ArgList* emptyList;
SmallStrings smallStrings;
NumericStrings numericStrings;
DateInstanceCache dateInstanceCache;
std::unique_ptr<SimpleStats> machineCodeBytesPerBytecodeWordForBaselineJIT;
WeakGCMap<std::pair<CustomGetterSetter*, int>, JSCustomGetterSetterFunction> customGetterSetterFunctionMap;
WeakGCMap<StringImpl*, JSString, PtrHash<StringImpl*>> stringCache;
Strong<JSString> lastCachedString;
AtomicStringTable* atomicStringTable() const { return m_atomicStringTable; }
WTF::SymbolRegistry& symbolRegistry() { return m_symbolRegistry; }
TemplateRegistryKeyTable& templateRegistryKeyTable() { return m_templateRegistryKeytable; }
WeakGCMap<SymbolImpl*, Symbol, PtrHash<SymbolImpl*>> symbolImplToSymbolMap;
enum class DeletePropertyMode {
// Default behaviour of deleteProperty, matching the spec.
Default,
// This setting causes deleteProperty to force deletion of all
// properties including those that are non-configurable (DontDelete).
IgnoreConfigurable
};
DeletePropertyMode deletePropertyMode()
{
return m_deletePropertyMode;
}
class DeletePropertyModeScope {
public:
DeletePropertyModeScope(VM& vm, DeletePropertyMode mode)
: m_vm(vm)
, m_previousMode(vm.m_deletePropertyMode)
{
m_vm.m_deletePropertyMode = mode;
}
~DeletePropertyModeScope()
{
m_vm.m_deletePropertyMode = m_previousMode;
}
private:
VM& m_vm;
DeletePropertyMode m_previousMode;
};
#if ENABLE(JIT)
bool canUseJIT() { return m_canUseJIT; }
#else
bool canUseJIT() { return false; } // interpreter only
#endif
#if ENABLE(YARR_JIT)
bool canUseRegExpJIT() { return m_canUseRegExpJIT; }
#else
bool canUseRegExpJIT() { return false; } // interpreter only
#endif
SourceProviderCache* addSourceProviderCache(SourceProvider*);
void clearSourceProviderCaches();
PrototypeMap prototypeMap;
typedef HashMap<RefPtr<SourceProvider>, RefPtr<SourceProviderCache>> SourceProviderCacheMap;
SourceProviderCacheMap sourceProviderCacheMap;
Interpreter* interpreter;
#if ENABLE(JIT)
std::unique_ptr<JITThunks> jitStubs;
MacroAssemblerCodeRef getCTIStub(ThunkGenerator generator)
{
return jitStubs->ctiStub(this, generator);
}
static RegisterAtOffsetList* getAllCalleeSaveRegisterOffsets();
#endif // ENABLE(JIT)
std::unique_ptr<CommonSlowPaths::ArityCheckData> arityCheckData;
#if ENABLE(FTL_JIT)
std::unique_ptr<FTL::Thunks> ftlThunks;
#endif
NativeExecutable* getHostFunction(NativeFunction, NativeFunction constructor, const String& name);
NativeExecutable* getHostFunction(NativeFunction, Intrinsic, NativeFunction constructor, const DOMJIT::Signature*, const String& name);
static ptrdiff_t exceptionOffset()
{
return OBJECT_OFFSETOF(VM, m_exception);
}
static ptrdiff_t callFrameForCatchOffset()
{
return OBJECT_OFFSETOF(VM, callFrameForCatch);
}
static ptrdiff_t targetMachinePCForThrowOffset()
{
return OBJECT_OFFSETOF(VM, targetMachinePCForThrow);
}
static ptrdiff_t topVMEntryFrameOffset()
{
return OBJECT_OFFSETOF(VM, topVMEntryFrame);
}
void restorePreviousException(Exception* exception) { setException(exception); }
void clearLastException() { m_lastException = nullptr; }
ExecState** addressOfCallFrameForCatch() { return &callFrameForCatch; }
JSCell** addressOfException() { return reinterpret_cast<JSCell**>(&m_exception); }
Exception* lastException() const { return m_lastException; }
JSCell** addressOfLastException() { return reinterpret_cast<JSCell**>(&m_lastException); }
void setFailNextNewCodeBlock() { m_failNextNewCodeBlock = true; }
bool getAndClearFailNextNewCodeBlock()
{
bool result = m_failNextNewCodeBlock;
m_failNextNewCodeBlock = false;
return result;
}
ALWAYS_INLINE Structure* getStructure(StructureID id)
{
return heap.structureIDTable().get(decontaminate(id));
}
void* stackPointerAtVMEntry() const { return m_stackPointerAtVMEntry; }
void setStackPointerAtVMEntry(void*);
size_t softReservedZoneSize() const { return m_currentSoftReservedZoneSize; }
size_t updateSoftReservedZoneSize(size_t softReservedZoneSize);
static size_t committedStackByteCount();
inline bool ensureStackCapacityFor(Register* newTopOfStack);
void* stackLimit() { return m_stackLimit; }
void* softStackLimit() { return m_softStackLimit; }
void** addressOfSoftStackLimit() { return &m_softStackLimit; }
#if !ENABLE(JIT)
void* cloopStackLimit() { return m_cloopStackLimit; }
void setCLoopStackLimit(void* limit) { m_cloopStackLimit = limit; }
#endif
inline bool isSafeToRecurseSoft() const;
bool isSafeToRecurse() const
{
return isSafeToRecurse(m_stackLimit);
}
void* lastStackTop() { return m_lastStackTop; }
void setLastStackTop(void*);
void firePrimitiveGigacageEnabledIfNecessary()
{
if (m_needToFirePrimitiveGigacageEnabled) {
m_needToFirePrimitiveGigacageEnabled = false;
m_primitiveGigacageEnabled.fireAll(*this, "Primitive gigacage disabled asynchronously");
}
}
JSValue hostCallReturnValue;
unsigned varargsLength;
ExecState* newCallFrameReturnValue;
ExecState* callFrameForCatch;
void* targetMachinePCForThrow;
Instruction* targetInterpreterPCForThrow;
uint32_t osrExitIndex;
void* osrExitJumpDestination;
bool isExecutingInRegExpJIT { false };
// The threading protocol here is as follows:
// - You can call scratchBufferForSize from any thread.
// - You can only set the ScratchBuffer's activeLength from the main thread.
ScratchBuffer* scratchBufferForSize(size_t size);
EncodedJSValue* exceptionFuzzingBuffer(size_t size)
{
ASSERT(Options::useExceptionFuzz());
if (!m_exceptionFuzzBuffer)
m_exceptionFuzzBuffer = MallocPtr<EncodedJSValue>::malloc(size);
return m_exceptionFuzzBuffer.get();
}
void gatherConservativeRoots(ConservativeRoots&);
VMEntryScope* entryScope;
JSObject* stringRecursionCheckFirstObject { nullptr };
HashSet<JSObject*> stringRecursionCheckVisitedObjects;
LocalTimeOffsetCache localTimeOffsetCache;
String cachedDateString;
double cachedDateStringValue;
std::unique_ptr<Profiler::Database> m_perBytecodeProfiler;
RefPtr<TypedArrayController> m_typedArrayController;
RegExpCache* m_regExpCache;
BumpPointerAllocator m_regExpAllocator;
ConcurrentJSLock m_regExpAllocatorLock;
std::unique_ptr<HasOwnPropertyCache> m_hasOwnPropertyCache;
ALWAYS_INLINE HasOwnPropertyCache* hasOwnPropertyCache() { return m_hasOwnPropertyCache.get(); }
HasOwnPropertyCache* ensureHasOwnPropertyCache();
#if ENABLE(REGEXP_TRACING)
typedef ListHashSet<RegExp*> RTTraceList;
RTTraceList* m_rtTraceList;
#endif
JS_EXPORT_PRIVATE void resetDateCache();
RegExpCache* regExpCache() { return m_regExpCache; }
#if ENABLE(REGEXP_TRACING)
void addRegExpToTrace(RegExp*);
#endif
JS_EXPORT_PRIVATE void dumpRegExpTrace();
bool isCollectorBusyOnCurrentThread() { return heap.isCurrentThreadBusy(); }
#if ENABLE(GC_VALIDATION)
bool isInitializingObject() const;
void setInitializingObjectClass(const ClassInfo*);
#endif
bool currentThreadIsHoldingAPILock() const { return m_apiLock->currentThreadIsHoldingLock(); }
JSLock& apiLock() { return *m_apiLock; }
CodeCache* codeCache() { return m_codeCache.get(); }
JS_EXPORT_PRIVATE void whenIdle(std::function<void()>);
JS_EXPORT_PRIVATE void deleteAllCode(DeleteAllCodeEffort);
JS_EXPORT_PRIVATE void deleteAllLinkedCode(DeleteAllCodeEffort);
WatchpointSet* ensureWatchpointSetForImpureProperty(const Identifier&);
void registerWatchpointForImpureProperty(const Identifier&, Watchpoint*);
// FIXME: Use AtomicString once it got merged with Identifier.
JS_EXPORT_PRIVATE void addImpureProperty(const String&);
InlineWatchpointSet& primitiveGigacageEnabled() { return m_primitiveGigacageEnabled; }
BuiltinExecutables* builtinExecutables() { return m_builtinExecutables.get(); }
bool enableTypeProfiler();
bool disableTypeProfiler();
TypeProfilerLog* typeProfilerLog() { return m_typeProfilerLog.get(); }
TypeProfiler* typeProfiler() { return m_typeProfiler.get(); }
JS_EXPORT_PRIVATE void dumpTypeProfilerData();
FunctionHasExecutedCache* functionHasExecutedCache() { return &m_functionHasExecutedCache; }
ControlFlowProfiler* controlFlowProfiler() { return m_controlFlowProfiler.get(); }
bool enableControlFlowProfiler();
bool disableControlFlowProfiler();
void queueMicrotask(JSGlobalObject&, Ref<Microtask>&&);
JS_EXPORT_PRIVATE void drainMicrotasks();
void setGlobalConstRedeclarationShouldThrow(bool globalConstRedeclarationThrow) { m_globalConstRedeclarationShouldThrow = globalConstRedeclarationThrow; }
ALWAYS_INLINE bool globalConstRedeclarationShouldThrow() const { return m_globalConstRedeclarationShouldThrow; }
void setShouldBuildPCToCodeOriginMapping() { m_shouldBuildPCToCodeOriginMapping = true; }
bool shouldBuilderPCToCodeOriginMapping() const { return m_shouldBuildPCToCodeOriginMapping; }
BytecodeIntrinsicRegistry& bytecodeIntrinsicRegistry() { return *m_bytecodeIntrinsicRegistry; }
ShadowChicken& shadowChicken() { return *m_shadowChicken; }
template<typename Func>
void logEvent(CodeBlock*, const char* summary, const Func& func);
std::optional<RefPtr<Thread>> ownerThread() const { return m_apiLock->ownerThread(); }
VMTraps& traps() { return m_traps; }
void handleTraps(ExecState* exec, VMTraps::Mask mask = VMTraps::Mask::allEventTypes()) { m_traps.handleTraps(exec, mask); }
bool needTrapHandling() { return m_traps.needTrapHandling(); }
bool needTrapHandling(VMTraps::Mask mask) { return m_traps.needTrapHandling(mask); }
void* needTrapHandlingAddress() { return m_traps.needTrapHandlingAddress(); }
void notifyNeedDebuggerBreak() { m_traps.fireTrap(VMTraps::NeedDebuggerBreak); }
void notifyNeedTermination() { m_traps.fireTrap(VMTraps::NeedTermination); }
void notifyNeedWatchdogCheck() { m_traps.fireTrap(VMTraps::NeedWatchdogCheck); }
#if ENABLE(EXCEPTION_SCOPE_VERIFICATION)
StackTrace* nativeStackTraceOfLastThrow() const { return m_nativeStackTraceOfLastThrow.get(); }
ThreadIdentifier throwingThread() const { return m_throwingThread; }
#endif
#if USE(CF)
CFRunLoopRef runLoop() const { return m_runLoop.get(); }
void registerRunLoopTimer(JSRunLoopTimer*);
void unregisterRunLoopTimer(JSRunLoopTimer*);
JS_EXPORT_PRIVATE void setRunLoop(CFRunLoopRef);
#endif // USE(CF)
private:
friend class LLIntOffsetsExtractor;
VM(VMType, HeapType);
static VM*& sharedInstanceInternal();
void createNativeThunk();
void updateStackLimits();
bool isSafeToRecurse(void* stackLimit) const
{
ASSERT(Thread::current().stack().isGrowingDownward());
void* curr = reinterpret_cast<void*>(&curr);
return curr >= stackLimit;
}
void setException(Exception* exception)
{
m_exception = exception;
m_lastException = exception;
}
Exception* exception() const
{
#if ENABLE(EXCEPTION_SCOPE_VERIFICATION)
m_needExceptionCheck = false;
#endif
return m_exception;
}
void clearException()
{
#if ENABLE(EXCEPTION_SCOPE_VERIFICATION)
m_needExceptionCheck = false;
m_nativeStackTraceOfLastThrow = nullptr;
m_throwingThread = 0;
#endif
m_exception = nullptr;
}
#if !ENABLE(JIT)
bool ensureStackCapacityForCLoop(Register* newTopOfStack);
bool isSafeToRecurseSoftCLoop() const;
#endif // !ENABLE(JIT)
JS_EXPORT_PRIVATE void throwException(ExecState*, Exception*);
JS_EXPORT_PRIVATE JSValue throwException(ExecState*, JSValue);
JS_EXPORT_PRIVATE JSObject* throwException(ExecState*, JSObject*);
#if ENABLE(EXCEPTION_SCOPE_VERIFICATION)
void verifyExceptionCheckNeedIsSatisfied(unsigned depth, ExceptionEventLocation&);
#endif
static void primitiveGigacageDisabledCallback(void*);
void primitiveGigacageDisabled();
#if ENABLE(ASSEMBLER)
bool m_canUseAssembler;
#endif
#if ENABLE(JIT)
bool m_canUseJIT;
#endif
#if ENABLE(YARR_JIT)
bool m_canUseRegExpJIT;
#endif
#if ENABLE(GC_VALIDATION)
const ClassInfo* m_initializingObjectClass;
#endif
void* m_stackPointerAtVMEntry;
size_t m_currentSoftReservedZoneSize;
void* m_stackLimit { nullptr };
void* m_softStackLimit { nullptr };
#if !ENABLE(JIT)
void* m_cloopStackLimit { nullptr };
#endif
void* m_lastStackTop;
Exception* m_exception { nullptr };
Exception* m_lastException { nullptr };
#if ENABLE(EXCEPTION_SCOPE_VERIFICATION)
ExceptionScope* m_topExceptionScope { nullptr };
ExceptionEventLocation m_simulatedThrowPointLocation;
unsigned m_simulatedThrowPointRecursionDepth { 0 };
mutable bool m_needExceptionCheck { false };
std::unique_ptr<StackTrace> m_nativeStackTraceOfLastThrow;
ThreadIdentifier m_throwingThread;
#endif
bool m_failNextNewCodeBlock { false };
DeletePropertyMode m_deletePropertyMode { DeletePropertyMode::Default };
bool m_globalConstRedeclarationShouldThrow { true };
bool m_shouldBuildPCToCodeOriginMapping { false };
std::unique_ptr<CodeCache> m_codeCache;
std::unique_ptr<BuiltinExecutables> m_builtinExecutables;
HashMap<String, RefPtr<WatchpointSet>> m_impurePropertyWatchpointSets;
std::unique_ptr<TypeProfiler> m_typeProfiler;
std::unique_ptr<TypeProfilerLog> m_typeProfilerLog;
unsigned m_typeProfilerEnabledCount;
bool m_needToFirePrimitiveGigacageEnabled { false };
Lock m_scratchBufferLock;
Vector<ScratchBuffer*> m_scratchBuffers;
size_t m_sizeOfLastScratchBuffer { 0 };
InlineWatchpointSet m_primitiveGigacageEnabled;
FunctionHasExecutedCache m_functionHasExecutedCache;
std::unique_ptr<ControlFlowProfiler> m_controlFlowProfiler;
unsigned m_controlFlowProfilerEnabledCount;
Deque<std::unique_ptr<QueuedTask>> m_microtaskQueue;
MallocPtr<EncodedJSValue> m_exceptionFuzzBuffer;
VMTraps m_traps;
RefPtr<Watchdog> m_watchdog;
std::unique_ptr<HeapProfiler> m_heapProfiler;
#if ENABLE(SAMPLING_PROFILER)
RefPtr<SamplingProfiler> m_samplingProfiler;
#endif
std::unique_ptr<ShadowChicken> m_shadowChicken;
std::unique_ptr<BytecodeIntrinsicRegistry> m_bytecodeIntrinsicRegistry;
VM* m_prev; // Required by DoublyLinkedListNode.
VM* m_next; // Required by DoublyLinkedListNode.
// Friends for exception checking purpose only.
friend class Heap;
friend class CatchScope;
friend class ExceptionScope;
friend class ThrowScope;
friend class VMTraps;
friend class WTF::DoublyLinkedListNode<VM>;
};
#if ENABLE(GC_VALIDATION)
inline bool VM::isInitializingObject() const
{
return !!m_initializingObjectClass;
}
inline void VM::setInitializingObjectClass(const ClassInfo* initializingObjectClass)
{
m_initializingObjectClass = initializingObjectClass;
}
#endif
inline Heap* WeakSet::heap() const
{
return &m_vm->heap;
}
#if ENABLE(JIT)
extern "C" void sanitizeStackForVMImpl(VM*);
#endif
void sanitizeStackForVM(VM*);
void logSanitizeStack(VM*);
} // namespace JSC