Rename AtomicString to AtomString
[WebKit-https.git] / Source / JavaScriptCore / runtime / VM.cpp
1 /*
2  * Copyright (C) 2008-2019 Apple Inc. All rights reserved.
3  *
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6  * are met:
7  *
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12  *     documentation and/or other materials provided with the distribution. 
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14  *     its contributors may be used to endorse or promote products derived
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26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27  */
28
29 #include "config.h"
30 #include "VM.h"
31
32 #include "ArgList.h"
33 #include "ArrayBufferNeuteringWatchpointSet.h"
34 #include "BuiltinExecutables.h"
35 #include "BytecodeIntrinsicRegistry.h"
36 #include "CodeBlock.h"
37 #include "CodeCache.h"
38 #include "CommonIdentifiers.h"
39 #include "CommonSlowPaths.h"
40 #include "CustomGetterSetter.h"
41 #include "DFGWorklist.h"
42 #include "DirectEvalExecutable.h"
43 #include "Disassembler.h"
44 #include "DoublePredictionFuzzerAgent.h"
45 #include "Error.h"
46 #include "ErrorConstructor.h"
47 #include "ErrorInstance.h"
48 #include "EvalCodeBlock.h"
49 #include "Exception.h"
50 #include "ExecutableToCodeBlockEdge.h"
51 #include "FTLThunks.h"
52 #include "FastMallocAlignedMemoryAllocator.h"
53 #include "FunctionCodeBlock.h"
54 #include "FunctionConstructor.h"
55 #include "FunctionExecutable.h"
56 #include "GCActivityCallback.h"
57 #include "GetterSetter.h"
58 #include "GigacageAlignedMemoryAllocator.h"
59 #include "HasOwnPropertyCache.h"
60 #include "Heap.h"
61 #include "HeapIterationScope.h"
62 #include "HeapProfiler.h"
63 #include "HostCallReturnValue.h"
64 #include "Identifier.h"
65 #include "IncrementalSweeper.h"
66 #include "IndirectEvalExecutable.h"
67 #include "Interpreter.h"
68 #include "IntlCollatorConstructor.h"
69 #include "IntlDateTimeFormatConstructor.h"
70 #include "IntlNumberFormatConstructor.h"
71 #include "IntlPluralRulesConstructor.h"
72 #include "JITCode.h"
73 #include "JITWorklist.h"
74 #include "JSAPIValueWrapper.h"
75 #include "JSArray.h"
76 #include "JSArrayBufferConstructor.h"
77 #include "JSAsyncFunction.h"
78 #include "JSBigInt.h"
79 #include "JSBoundFunction.h"
80 #include "JSCInlines.h"
81 #include "JSCallbackFunction.h"
82 #include "JSCustomGetterSetterFunction.h"
83 #include "JSDestructibleObjectHeapCellType.h"
84 #include "JSFixedArray.h"
85 #include "JSFunction.h"
86 #include "JSGlobalObjectFunctions.h"
87 #include "JSImmutableButterfly.h"
88 #include "JSInternalPromiseDeferred.h"
89 #include "JSLock.h"
90 #include "JSMap.h"
91 #include "JSMapIterator.h"
92 #include "JSPromiseDeferred.h"
93 #include "JSPropertyNameEnumerator.h"
94 #include "JSScriptFetchParameters.h"
95 #include "JSScriptFetcher.h"
96 #include "JSSet.h"
97 #include "JSSetIterator.h"
98 #include "JSSourceCode.h"
99 #include "JSStringHeapCellType.h"
100 #include "JSTemplateObjectDescriptor.h"
101 #include "JSWeakMap.h"
102 #include "JSWeakSet.h"
103 #include "JSWebAssembly.h"
104 #include "JSWebAssemblyCodeBlock.h"
105 #include "JSWebAssemblyCodeBlockHeapCellType.h"
106 #include "JSWithScope.h"
107 #include "LLIntData.h"
108 #include "Lexer.h"
109 #include "Lookup.h"
110 #include "MinimumReservedZoneSize.h"
111 #include "ModuleProgramCodeBlock.h"
112 #include "ModuleProgramExecutable.h"
113 #include "NativeErrorConstructor.h"
114 #include "NativeExecutable.h"
115 #include "NativeStdFunctionCell.h"
116 #include "Nodes.h"
117 #include "ObjCCallbackFunction.h"
118 #include "Parser.h"
119 #include "ProfilerDatabase.h"
120 #include "ProgramCodeBlock.h"
121 #include "ProgramExecutable.h"
122 #include "PromiseDeferredTimer.h"
123 #include "PropertyMapHashTable.h"
124 #include "ProxyRevoke.h"
125 #include "RandomizingFuzzerAgent.h"
126 #include "RegExpCache.h"
127 #include "RegExpObject.h"
128 #include "RegisterAtOffsetList.h"
129 #include "RuntimeType.h"
130 #include "SamplingProfiler.h"
131 #include "ShadowChicken.h"
132 #include "SimpleTypedArrayController.h"
133 #include "SourceProviderCache.h"
134 #include "StackVisitor.h"
135 #include "StrictEvalActivation.h"
136 #include "StrongInlines.h"
137 #include "StructureInlines.h"
138 #include "TestRunnerUtils.h"
139 #include "ThunkGenerators.h"
140 #include "TypeProfiler.h"
141 #include "TypeProfilerLog.h"
142 #include "UnlinkedCodeBlock.h"
143 #include "VMEntryScope.h"
144 #include "VMInlines.h"
145 #include "VMInspector.h"
146 #include "VariableEnvironment.h"
147 #include "WasmWorklist.h"
148 #include "Watchdog.h"
149 #include "WeakGCMapInlines.h"
150 #include "WebAssemblyFunction.h"
151 #include "WebAssemblyFunctionHeapCellType.h"
152 #include "WebAssemblyWrapperFunction.h"
153 #include <wtf/ProcessID.h>
154 #include <wtf/ReadWriteLock.h>
155 #include <wtf/SimpleStats.h>
156 #include <wtf/StringPrintStream.h>
157 #include <wtf/Threading.h>
158 #include <wtf/text/AtomStringTable.h>
159 #include <wtf/text/SymbolRegistry.h>
160
161 #if ENABLE(C_LOOP)
162 #include "CLoopStack.h"
163 #include "CLoopStackInlines.h"
164 #endif
165
166 #if ENABLE(DFG_JIT)
167 #include "ConservativeRoots.h"
168 #endif
169
170 #if ENABLE(REGEXP_TRACING)
171 #include "RegExp.h"
172 #endif
173
174 namespace JSC {
175
176 #if ENABLE(JIT)
177 #if !ASSERT_DISABLED
178 bool VM::s_canUseJITIsSet = false;
179 #endif
180 bool VM::s_canUseJIT = false;
181 #endif
182
183 Atomic<unsigned> VM::s_numberOfIDs;
184
185 // Note: Platform.h will enforce that ENABLE(ASSEMBLER) is true if either
186 // ENABLE(JIT) or ENABLE(YARR_JIT) or both are enabled. The code below
187 // just checks for ENABLE(JIT) or ENABLE(YARR_JIT) with this premise in mind.
188
189 #if ENABLE(ASSEMBLER)
190 static bool enableAssembler()
191 {
192     if (!Options::useJIT())
193         return false;
194
195     char* canUseJITString = getenv("JavaScriptCoreUseJIT");
196     if (canUseJITString && !atoi(canUseJITString))
197         return false;
198
199     ExecutableAllocator::initializeUnderlyingAllocator();
200     if (!ExecutableAllocator::singleton().isValid()) {
201         if (Options::crashIfCantAllocateJITMemory())
202             CRASH();
203         return false;
204     }
205
206     return true;
207 }
208 #endif // ENABLE(!ASSEMBLER)
209
210 bool VM::canUseAssembler()
211 {
212 #if ENABLE(ASSEMBLER)
213     static std::once_flag onceKey;
214     static bool enabled = false;
215     std::call_once(onceKey, [] {
216         enabled = enableAssembler();
217     });
218     return enabled;
219 #else
220     return false; // interpreter only
221 #endif
222 }
223
224 void VM::computeCanUseJIT()
225 {
226 #if ENABLE(JIT)
227 #if !ASSERT_DISABLED
228     RELEASE_ASSERT(!s_canUseJITIsSet);
229     s_canUseJITIsSet = true;
230 #endif
231     s_canUseJIT = VM::canUseAssembler() && Options::useJIT();
232 #endif
233 }
234
235 inline unsigned VM::nextID()
236 {
237     for (;;) {
238         unsigned currentNumberOfIDs = s_numberOfIDs.load();
239         unsigned newID = currentNumberOfIDs + 1;
240         if (s_numberOfIDs.compareExchangeWeak(currentNumberOfIDs, newID))
241             return newID;
242     }
243 }
244
245 static bool vmCreationShouldCrash = false;
246
247 VM::VM(VMType vmType, HeapType heapType)
248     : m_id(nextID())
249     , m_apiLock(adoptRef(new JSLock(this)))
250 #if USE(CF)
251     , m_runLoop(CFRunLoopGetCurrent())
252 #endif // USE(CF)
253     , heap(this, heapType)
254     , fastMallocAllocator(std::make_unique<FastMallocAlignedMemoryAllocator>())
255     , primitiveGigacageAllocator(std::make_unique<GigacageAlignedMemoryAllocator>(Gigacage::Primitive))
256     , jsValueGigacageAllocator(std::make_unique<GigacageAlignedMemoryAllocator>(Gigacage::JSValue))
257     , auxiliaryHeapCellType(std::make_unique<HeapCellType>(CellAttributes(DoesNotNeedDestruction, HeapCell::Auxiliary)))
258     , immutableButterflyHeapCellType(std::make_unique<HeapCellType>(CellAttributes(DoesNotNeedDestruction, HeapCell::JSCellWithInteriorPointers)))
259     , cellHeapCellType(std::make_unique<HeapCellType>(CellAttributes(DoesNotNeedDestruction, HeapCell::JSCell)))
260     , destructibleCellHeapCellType(std::make_unique<HeapCellType>(CellAttributes(NeedsDestruction, HeapCell::JSCell)))
261     , stringHeapCellType(std::make_unique<JSStringHeapCellType>())
262     , destructibleObjectHeapCellType(std::make_unique<JSDestructibleObjectHeapCellType>())
263 #if ENABLE(WEBASSEMBLY)
264     , webAssemblyCodeBlockHeapCellType(std::make_unique<JSWebAssemblyCodeBlockHeapCellType>())
265     , webAssemblyFunctionHeapCellType(std::make_unique<WebAssemblyFunctionHeapCellType>())
266 #endif
267     , primitiveGigacageAuxiliarySpace("Primitive Gigacage Auxiliary", heap, auxiliaryHeapCellType.get(), primitiveGigacageAllocator.get())
268     , jsValueGigacageAuxiliarySpace("JSValue Gigacage Auxiliary", heap, auxiliaryHeapCellType.get(), jsValueGigacageAllocator.get())
269     , immutableButterflyJSValueGigacageAuxiliarySpace("ImmutableButterfly Gigacage JSCellWithInteriorPointers", heap, immutableButterflyHeapCellType.get(), jsValueGigacageAllocator.get())
270     , cellSpace("JSCell", heap, cellHeapCellType.get(), fastMallocAllocator.get())
271     , jsValueGigacageCellSpace("JSValue Gigacage JSCell", heap, cellHeapCellType.get(), jsValueGigacageAllocator.get())
272     , destructibleCellSpace("Destructible JSCell", heap, destructibleCellHeapCellType.get(), fastMallocAllocator.get())
273     , stringSpace("JSString", heap, stringHeapCellType.get(), fastMallocAllocator.get())
274     , destructibleObjectSpace("JSDestructibleObject", heap, destructibleObjectHeapCellType.get(), fastMallocAllocator.get())
275     , eagerlySweptDestructibleObjectSpace("Eagerly Swept JSDestructibleObject", heap, destructibleObjectHeapCellType.get(), fastMallocAllocator.get())
276     , executableToCodeBlockEdgeSpace ISO_SUBSPACE_INIT(heap, cellHeapCellType.get(), ExecutableToCodeBlockEdge)
277     , functionSpace ISO_SUBSPACE_INIT(heap, cellHeapCellType.get(), JSFunction)
278     , internalFunctionSpace ISO_SUBSPACE_INIT(heap, destructibleObjectHeapCellType.get(), InternalFunction)
279     , nativeExecutableSpace ISO_SUBSPACE_INIT(heap, destructibleCellHeapCellType.get(), NativeExecutable)
280     , propertyTableSpace ISO_SUBSPACE_INIT(heap, destructibleCellHeapCellType.get(), PropertyTable)
281     , structureRareDataSpace ISO_SUBSPACE_INIT(heap, destructibleCellHeapCellType.get(), StructureRareData)
282     , structureSpace ISO_SUBSPACE_INIT(heap, destructibleCellHeapCellType.get(), Structure)
283     , symbolTableSpace ISO_SUBSPACE_INIT(heap, destructibleCellHeapCellType.get(), SymbolTable)
284     , executableToCodeBlockEdgesWithConstraints(executableToCodeBlockEdgeSpace)
285     , executableToCodeBlockEdgesWithFinalizers(executableToCodeBlockEdgeSpace)
286     , codeBlockSpace ISO_SUBSPACE_INIT(heap, destructibleCellHeapCellType.get(), CodeBlock)
287     , functionExecutableSpace ISO_SUBSPACE_INIT(heap, destructibleCellHeapCellType.get(), FunctionExecutable)
288     , programExecutableSpace ISO_SUBSPACE_INIT(heap, destructibleCellHeapCellType.get(), ProgramExecutable)
289     , unlinkedFunctionExecutableSpace ISO_SUBSPACE_INIT(heap, destructibleCellHeapCellType.get(), UnlinkedFunctionExecutable)
290     , vmType(vmType)
291     , clientData(0)
292     , topEntryFrame(nullptr)
293     , topCallFrame(CallFrame::noCaller())
294     , promiseDeferredTimer(std::make_unique<PromiseDeferredTimer>(*this))
295     , m_atomStringTable(vmType == Default ? Thread::current().atomStringTable() : new AtomStringTable)
296     , propertyNames(nullptr)
297     , emptyList(new ArgList)
298     , machineCodeBytesPerBytecodeWordForBaselineJIT(std::make_unique<SimpleStats>())
299     , customGetterSetterFunctionMap(*this)
300     , stringCache(*this)
301     , symbolImplToSymbolMap(*this)
302     , structureCache(*this)
303     , interpreter(0)
304     , entryScope(0)
305     , m_regExpCache(new RegExpCache(this))
306     , m_compactVariableMap(adoptRef(*(new CompactVariableMap)))
307 #if ENABLE(REGEXP_TRACING)
308     , m_rtTraceList(new RTTraceList())
309 #endif
310 #if ENABLE(GC_VALIDATION)
311     , m_initializingObjectClass(0)
312 #endif
313     , m_stackPointerAtVMEntry(0)
314     , m_codeCache(std::make_unique<CodeCache>())
315     , m_builtinExecutables(std::make_unique<BuiltinExecutables>(*this))
316     , m_typeProfilerEnabledCount(0)
317     , m_primitiveGigacageEnabled(IsWatched)
318     , m_controlFlowProfilerEnabledCount(0)
319 {
320     if (UNLIKELY(vmCreationShouldCrash))
321         CRASH_WITH_INFO(0x4242424220202020, 0xbadbeef0badbeef, 0x1234123412341234, 0x1337133713371337);
322
323     interpreter = new Interpreter(*this);
324     StackBounds stack = Thread::current().stack();
325     updateSoftReservedZoneSize(Options::softReservedZoneSize());
326     setLastStackTop(stack.origin());
327
328     JSRunLoopTimer::Manager::shared().registerVM(*this);
329
330     // Need to be careful to keep everything consistent here
331     JSLockHolder lock(this);
332     AtomStringTable* existingEntryAtomStringTable = Thread::current().setCurrentAtomStringTable(m_atomStringTable);
333     structureStructure.set(*this, Structure::createStructure(*this));
334     structureRareDataStructure.set(*this, StructureRareData::createStructure(*this, 0, jsNull()));
335     stringStructure.set(*this, JSString::createStructure(*this, 0, jsNull()));
336
337     smallStrings.initializeCommonStrings(*this);
338
339     propertyNames = new CommonIdentifiers(this);
340     terminatedExecutionErrorStructure.set(*this, TerminatedExecutionError::createStructure(*this, 0, jsNull()));
341     propertyNameEnumeratorStructure.set(*this, JSPropertyNameEnumerator::createStructure(*this, 0, jsNull()));
342     customGetterSetterStructure.set(*this, CustomGetterSetter::createStructure(*this, 0, jsNull()));
343     domAttributeGetterSetterStructure.set(*this, DOMAttributeGetterSetter::createStructure(*this, 0, jsNull()));
344     scopedArgumentsTableStructure.set(*this, ScopedArgumentsTable::createStructure(*this, 0, jsNull()));
345     apiWrapperStructure.set(*this, JSAPIValueWrapper::createStructure(*this, 0, jsNull()));
346     nativeExecutableStructure.set(*this, NativeExecutable::createStructure(*this, 0, jsNull()));
347     evalExecutableStructure.set(*this, EvalExecutable::createStructure(*this, 0, jsNull()));
348     programExecutableStructure.set(*this, ProgramExecutable::createStructure(*this, 0, jsNull()));
349     functionExecutableStructure.set(*this, FunctionExecutable::createStructure(*this, 0, jsNull()));
350 #if ENABLE(WEBASSEMBLY)
351     webAssemblyCodeBlockStructure.set(*this, JSWebAssemblyCodeBlock::createStructure(*this, 0, jsNull()));
352 #endif
353     moduleProgramExecutableStructure.set(*this, ModuleProgramExecutable::createStructure(*this, 0, jsNull()));
354     regExpStructure.set(*this, RegExp::createStructure(*this, 0, jsNull()));
355     symbolStructure.set(*this, Symbol::createStructure(*this, 0, jsNull()));
356     symbolTableStructure.set(*this, SymbolTable::createStructure(*this, 0, jsNull()));
357     fixedArrayStructure.set(*this, JSFixedArray::createStructure(*this, 0, jsNull()));
358
359     immutableButterflyStructures[arrayIndexFromIndexingType(CopyOnWriteArrayWithInt32) - NumberOfIndexingShapes].set(*this, JSImmutableButterfly::createStructure(*this, 0, jsNull(), CopyOnWriteArrayWithInt32));
360     immutableButterflyStructures[arrayIndexFromIndexingType(CopyOnWriteArrayWithDouble) - NumberOfIndexingShapes].set(*this, JSImmutableButterfly::createStructure(*this, 0, jsNull(), CopyOnWriteArrayWithDouble));
361     immutableButterflyStructures[arrayIndexFromIndexingType(CopyOnWriteArrayWithContiguous) - NumberOfIndexingShapes].set(*this, JSImmutableButterfly::createStructure(*this, 0, jsNull(), CopyOnWriteArrayWithContiguous));
362
363     sourceCodeStructure.set(*this, JSSourceCode::createStructure(*this, 0, jsNull()));
364     scriptFetcherStructure.set(*this, JSScriptFetcher::createStructure(*this, 0, jsNull()));
365     scriptFetchParametersStructure.set(*this, JSScriptFetchParameters::createStructure(*this, 0, jsNull()));
366     structureChainStructure.set(*this, StructureChain::createStructure(*this, 0, jsNull()));
367     sparseArrayValueMapStructure.set(*this, SparseArrayValueMap::createStructure(*this, 0, jsNull()));
368     templateObjectDescriptorStructure.set(*this, JSTemplateObjectDescriptor::createStructure(*this, 0, jsNull()));
369     arrayBufferNeuteringWatchpointStructure.set(*this, ArrayBufferNeuteringWatchpointSet::createStructure(*this));
370     unlinkedFunctionExecutableStructure.set(*this, UnlinkedFunctionExecutable::createStructure(*this, 0, jsNull()));
371     unlinkedProgramCodeBlockStructure.set(*this, UnlinkedProgramCodeBlock::createStructure(*this, 0, jsNull()));
372     unlinkedEvalCodeBlockStructure.set(*this, UnlinkedEvalCodeBlock::createStructure(*this, 0, jsNull()));
373     unlinkedFunctionCodeBlockStructure.set(*this, UnlinkedFunctionCodeBlock::createStructure(*this, 0, jsNull()));
374     unlinkedModuleProgramCodeBlockStructure.set(*this, UnlinkedModuleProgramCodeBlock::createStructure(*this, 0, jsNull()));
375     propertyTableStructure.set(*this, PropertyTable::createStructure(*this, 0, jsNull()));
376     functionRareDataStructure.set(*this, FunctionRareData::createStructure(*this, 0, jsNull()));
377     exceptionStructure.set(*this, Exception::createStructure(*this, 0, jsNull()));
378     promiseDeferredStructure.set(*this, JSPromiseDeferred::createStructure(*this, 0, jsNull()));
379     internalPromiseDeferredStructure.set(*this, JSInternalPromiseDeferred::createStructure(*this, 0, jsNull()));
380     nativeStdFunctionCellStructure.set(*this, NativeStdFunctionCell::createStructure(*this, 0, jsNull()));
381     programCodeBlockStructure.set(*this, ProgramCodeBlock::createStructure(*this, 0, jsNull()));
382     moduleProgramCodeBlockStructure.set(*this, ModuleProgramCodeBlock::createStructure(*this, 0, jsNull()));
383     evalCodeBlockStructure.set(*this, EvalCodeBlock::createStructure(*this, 0, jsNull()));
384     functionCodeBlockStructure.set(*this, FunctionCodeBlock::createStructure(*this, 0, jsNull()));
385     hashMapBucketSetStructure.set(*this, HashMapBucket<HashMapBucketDataKey>::createStructure(*this, 0, jsNull()));
386     hashMapBucketMapStructure.set(*this, HashMapBucket<HashMapBucketDataKeyValue>::createStructure(*this, 0, jsNull()));
387     bigIntStructure.set(*this, JSBigInt::createStructure(*this, 0, jsNull()));
388     executableToCodeBlockEdgeStructure.set(*this, ExecutableToCodeBlockEdge::createStructure(*this, nullptr, jsNull()));
389
390     // Eagerly initialize constant cells since the concurrent compiler can access them.
391     if (canUseJIT()) {
392         sentinelMapBucket();
393         sentinelSetBucket();
394     }
395
396     Thread::current().setCurrentAtomStringTable(existingEntryAtomStringTable);
397     
398 #if !ENABLE(C_LOOP)
399     initializeHostCallReturnValue(); // This is needed to convince the linker not to drop host call return support.
400 #endif
401     
402     Gigacage::addPrimitiveDisableCallback(primitiveGigacageDisabledCallback, this);
403
404     heap.notifyIsSafeToCollect();
405     
406     LLInt::Data::performAssertions(*this);
407     
408     if (UNLIKELY(Options::useProfiler())) {
409         m_perBytecodeProfiler = std::make_unique<Profiler::Database>(*this);
410
411         StringPrintStream pathOut;
412         const char* profilerPath = getenv("JSC_PROFILER_PATH");
413         if (profilerPath)
414             pathOut.print(profilerPath, "/");
415         pathOut.print("JSCProfile-", getCurrentProcessID(), "-", m_perBytecodeProfiler->databaseID(), ".json");
416         m_perBytecodeProfiler->registerToSaveAtExit(pathOut.toCString().data());
417     }
418
419     callFrameForCatch = nullptr;
420
421     // Initialize this last, as a free way of asserting that VM initialization itself
422     // won't use this.
423     m_typedArrayController = adoptRef(new SimpleTypedArrayController());
424
425     m_bytecodeIntrinsicRegistry = std::make_unique<BytecodeIntrinsicRegistry>(*this);
426
427     if (Options::useTypeProfiler())
428         enableTypeProfiler();
429     if (Options::useControlFlowProfiler())
430         enableControlFlowProfiler();
431 #if ENABLE(SAMPLING_PROFILER)
432     if (Options::useSamplingProfiler()) {
433         setShouldBuildPCToCodeOriginMapping();
434         Ref<Stopwatch> stopwatch = Stopwatch::create();
435         stopwatch->start();
436         m_samplingProfiler = adoptRef(new SamplingProfiler(*this, WTFMove(stopwatch)));
437         if (Options::samplingProfilerPath())
438             m_samplingProfiler->registerForReportAtExit();
439         m_samplingProfiler->start();
440     }
441 #endif // ENABLE(SAMPLING_PROFILER)
442
443     if (Options::useRandomizingFuzzerAgent())
444         setFuzzerAgent(std::make_unique<RandomizingFuzzerAgent>(*this));
445     else if (Options::useDoublePredictionFuzzerAgent())
446         setFuzzerAgent(std::make_unique<DoublePredictionFuzzerAgent>(*this));
447
448     if (Options::alwaysGeneratePCToCodeOriginMap())
449         setShouldBuildPCToCodeOriginMapping();
450
451     if (Options::watchdog()) {
452         Watchdog& watchdog = ensureWatchdog();
453         watchdog.setTimeLimit(Seconds::fromMilliseconds(Options::watchdog()));
454     }
455
456 #if ENABLE(JIT)
457     // Make sure that any stubs that the JIT is going to use are initialized in non-compilation threads.
458     if (canUseJIT()) {
459         jitStubs = std::make_unique<JITThunks>();
460 #if ENABLE(FTL_JIT)
461         ftlThunks = std::make_unique<FTL::Thunks>();
462 #endif // ENABLE(FTL_JIT)
463         getCTIInternalFunctionTrampolineFor(CodeForCall);
464         getCTIInternalFunctionTrampolineFor(CodeForConstruct);
465     }
466 #endif
467
468     if (Options::forceDebuggerBytecodeGeneration() || Options::alwaysUseShadowChicken())
469         ensureShadowChicken();
470
471     VMInspector::instance().add(this);
472 }
473
474 static ReadWriteLock s_destructionLock;
475
476 void waitForVMDestruction()
477 {
478     auto locker = holdLock(s_destructionLock.write());
479 }
480
481 VM::~VM()
482 {
483     auto destructionLocker = holdLock(s_destructionLock.read());
484     
485     Gigacage::removePrimitiveDisableCallback(primitiveGigacageDisabledCallback, this);
486     promiseDeferredTimer->stopRunningTasks();
487 #if ENABLE(WEBASSEMBLY)
488     if (Wasm::Worklist* worklist = Wasm::existingWorklistOrNull())
489         worklist->stopAllPlansForContext(wasmContext);
490 #endif
491     if (UNLIKELY(m_watchdog))
492         m_watchdog->willDestroyVM(this);
493     m_traps.willDestroyVM();
494     VMInspector::instance().remove(this);
495
496     // Never GC, ever again.
497     heap.incrementDeferralDepth();
498
499 #if ENABLE(SAMPLING_PROFILER)
500     if (m_samplingProfiler) {
501         m_samplingProfiler->reportDataToOptionFile();
502         m_samplingProfiler->shutdown();
503     }
504 #endif // ENABLE(SAMPLING_PROFILER)
505     
506 #if ENABLE(JIT)
507     if (JITWorklist* worklist = JITWorklist::existingGlobalWorklistOrNull())
508         worklist->completeAllForVM(*this);
509 #endif // ENABLE(JIT)
510
511 #if ENABLE(DFG_JIT)
512     // Make sure concurrent compilations are done, but don't install them, since there is
513     // no point to doing so.
514     for (unsigned i = DFG::numberOfWorklists(); i--;) {
515         if (DFG::Worklist* worklist = DFG::existingWorklistForIndexOrNull(i)) {
516             worklist->removeNonCompilingPlansForVM(*this);
517             worklist->waitUntilAllPlansForVMAreReady(*this);
518             worklist->removeAllReadyPlansForVM(*this);
519         }
520     }
521 #endif // ENABLE(DFG_JIT)
522     
523     waitForAsynchronousDisassembly();
524     
525     // Clear this first to ensure that nobody tries to remove themselves from it.
526     m_perBytecodeProfiler = nullptr;
527
528     ASSERT(currentThreadIsHoldingAPILock());
529     m_apiLock->willDestroyVM(this);
530     smallStrings.setIsInitialized(false);
531     heap.lastChanceToFinalize();
532
533     JSRunLoopTimer::Manager::shared().unregisterVM(*this);
534     
535     delete interpreter;
536 #ifndef NDEBUG
537     interpreter = reinterpret_cast<Interpreter*>(0xbbadbeef);
538 #endif
539
540     delete emptyList;
541
542     delete propertyNames;
543     if (vmType != Default)
544         delete m_atomStringTable;
545
546     delete clientData;
547     delete m_regExpCache;
548
549 #if ENABLE(REGEXP_TRACING)
550     delete m_rtTraceList;
551 #endif
552
553 #if ENABLE(DFG_JIT)
554     for (unsigned i = 0; i < m_scratchBuffers.size(); ++i)
555         fastFree(m_scratchBuffers[i]);
556 #endif
557 }
558
559 void VM::primitiveGigacageDisabledCallback(void* argument)
560 {
561     static_cast<VM*>(argument)->primitiveGigacageDisabled();
562 }
563
564 void VM::primitiveGigacageDisabled()
565 {
566     if (m_apiLock->currentThreadIsHoldingLock()) {
567         m_primitiveGigacageEnabled.fireAll(*this, "Primitive gigacage disabled");
568         return;
569     }
570  
571     // This is totally racy, and that's OK. The point is, it's up to the user to ensure that they pass the
572     // uncaged buffer in a nicely synchronized manner.
573     m_needToFirePrimitiveGigacageEnabled = true;
574 }
575
576 void VM::setLastStackTop(void* lastStackTop)
577
578     m_lastStackTop = lastStackTop;
579 }
580
581 Ref<VM> VM::createContextGroup(HeapType heapType)
582 {
583     return adoptRef(*new VM(APIContextGroup, heapType));
584 }
585
586 Ref<VM> VM::create(HeapType heapType)
587 {
588     return adoptRef(*new VM(Default, heapType));
589 }
590
591 bool VM::sharedInstanceExists()
592 {
593     return sharedInstanceInternal();
594 }
595
596 VM& VM::sharedInstance()
597 {
598     GlobalJSLock globalLock;
599     VM*& instance = sharedInstanceInternal();
600     if (!instance)
601         instance = adoptRef(new VM(APIShared, SmallHeap)).leakRef();
602     return *instance;
603 }
604
605 VM*& VM::sharedInstanceInternal()
606 {
607     static VM* sharedInstance;
608     return sharedInstance;
609 }
610
611 Watchdog& VM::ensureWatchdog()
612 {
613     if (!m_watchdog)
614         m_watchdog = adoptRef(new Watchdog(this));
615     return *m_watchdog;
616 }
617
618 HeapProfiler& VM::ensureHeapProfiler()
619 {
620     if (!m_heapProfiler)
621         m_heapProfiler = std::make_unique<HeapProfiler>(*this);
622     return *m_heapProfiler;
623 }
624
625 #if ENABLE(SAMPLING_PROFILER)
626 SamplingProfiler& VM::ensureSamplingProfiler(RefPtr<Stopwatch>&& stopwatch)
627 {
628     if (!m_samplingProfiler)
629         m_samplingProfiler = adoptRef(new SamplingProfiler(*this, WTFMove(stopwatch)));
630     return *m_samplingProfiler;
631 }
632 #endif // ENABLE(SAMPLING_PROFILER)
633
634 #if ENABLE(JIT)
635 static ThunkGenerator thunkGeneratorForIntrinsic(Intrinsic intrinsic)
636 {
637     switch (intrinsic) {
638     case CharCodeAtIntrinsic:
639         return charCodeAtThunkGenerator;
640     case CharAtIntrinsic:
641         return charAtThunkGenerator;
642     case Clz32Intrinsic:
643         return clz32ThunkGenerator;
644     case FromCharCodeIntrinsic:
645         return fromCharCodeThunkGenerator;
646     case SqrtIntrinsic:
647         return sqrtThunkGenerator;
648     case AbsIntrinsic:
649         return absThunkGenerator;
650     case FloorIntrinsic:
651         return floorThunkGenerator;
652     case CeilIntrinsic:
653         return ceilThunkGenerator;
654     case TruncIntrinsic:
655         return truncThunkGenerator;
656     case RoundIntrinsic:
657         return roundThunkGenerator;
658     case ExpIntrinsic:
659         return expThunkGenerator;
660     case LogIntrinsic:
661         return logThunkGenerator;
662     case IMulIntrinsic:
663         return imulThunkGenerator;
664     case RandomIntrinsic:
665         return randomThunkGenerator;
666     case BoundThisNoArgsFunctionCallIntrinsic:
667         return boundThisNoArgsFunctionCallGenerator;
668     default:
669         return nullptr;
670     }
671 }
672
673 #endif // ENABLE(JIT)
674
675 NativeExecutable* VM::getHostFunction(NativeFunction function, NativeFunction constructor, const String& name)
676 {
677     return getHostFunction(function, NoIntrinsic, constructor, nullptr, name);
678 }
679
680 static Ref<NativeJITCode> jitCodeForCallTrampoline()
681 {
682     static NativeJITCode* result;
683     static std::once_flag onceKey;
684     std::call_once(onceKey, [&] {
685         result = new NativeJITCode(LLInt::getCodeRef<JSEntryPtrTag>(llint_native_call_trampoline), JITType::HostCallThunk, NoIntrinsic);
686     });
687     return makeRef(*result);
688 }
689
690 static Ref<NativeJITCode> jitCodeForConstructTrampoline()
691 {
692     static NativeJITCode* result;
693     static std::once_flag onceKey;
694     std::call_once(onceKey, [&] {
695         result = new NativeJITCode(LLInt::getCodeRef<JSEntryPtrTag>(llint_native_construct_trampoline), JITType::HostCallThunk, NoIntrinsic);
696     });
697     return makeRef(*result);
698 }
699
700 NativeExecutable* VM::getHostFunction(NativeFunction function, Intrinsic intrinsic, NativeFunction constructor, const DOMJIT::Signature* signature, const String& name)
701 {
702 #if ENABLE(JIT)
703     if (canUseJIT()) {
704         return jitStubs->hostFunctionStub(
705             this, function, constructor,
706             intrinsic != NoIntrinsic ? thunkGeneratorForIntrinsic(intrinsic) : 0,
707             intrinsic, signature, name);
708     }
709 #endif // ENABLE(JIT)
710     UNUSED_PARAM(intrinsic);
711     UNUSED_PARAM(signature);
712     return NativeExecutable::create(*this, jitCodeForCallTrampoline(), function, jitCodeForConstructTrampoline(), constructor, name);
713 }
714
715 MacroAssemblerCodePtr<JSEntryPtrTag> VM::getCTIInternalFunctionTrampolineFor(CodeSpecializationKind kind)
716 {
717 #if ENABLE(JIT)
718     if (canUseJIT()) {
719         if (kind == CodeForCall)
720             return jitStubs->ctiInternalFunctionCall(this).retagged<JSEntryPtrTag>();
721         return jitStubs->ctiInternalFunctionConstruct(this).retagged<JSEntryPtrTag>();
722     }
723 #endif
724     if (kind == CodeForCall)
725         return LLInt::getCodePtr<JSEntryPtrTag>(llint_internal_function_call_trampoline);
726     return LLInt::getCodePtr<JSEntryPtrTag>(llint_internal_function_construct_trampoline);
727 }
728
729 VM::ClientData::~ClientData()
730 {
731 }
732
733 void VM::resetDateCache()
734 {
735     localTimeOffsetCache.reset();
736     cachedDateString = String();
737     cachedDateStringValue = std::numeric_limits<double>::quiet_NaN();
738     dateInstanceCache.reset();
739 }
740
741 void VM::whenIdle(Function<void()>&& callback)
742 {
743     if (!entryScope) {
744         callback();
745         return;
746     }
747
748     entryScope->addDidPopListener(WTFMove(callback));
749 }
750
751 void VM::deleteAllLinkedCode(DeleteAllCodeEffort effort)
752 {
753     whenIdle([=] () {
754         heap.deleteAllCodeBlocks(effort);
755     });
756 }
757
758 void VM::deleteAllCode(DeleteAllCodeEffort effort)
759 {
760     whenIdle([=] () {
761         m_codeCache->clear();
762         m_regExpCache->deleteAllCode();
763         heap.deleteAllCodeBlocks(effort);
764         heap.deleteAllUnlinkedCodeBlocks(effort);
765         heap.reportAbandonedObjectGraph();
766     });
767 }
768
769 void VM::shrinkFootprintWhenIdle()
770 {
771     whenIdle([=] () {
772         sanitizeStackForVM(this);
773         deleteAllCode(DeleteAllCodeIfNotCollecting);
774         heap.collectNow(Synchronousness::Sync, CollectionScope::Full);
775         // FIXME: Consider stopping various automatic threads here.
776         // https://bugs.webkit.org/show_bug.cgi?id=185447
777         WTF::releaseFastMallocFreeMemory();
778     });
779 }
780
781 SourceProviderCache* VM::addSourceProviderCache(SourceProvider* sourceProvider)
782 {
783     auto addResult = sourceProviderCacheMap.add(sourceProvider, nullptr);
784     if (addResult.isNewEntry)
785         addResult.iterator->value = adoptRef(new SourceProviderCache);
786     return addResult.iterator->value.get();
787 }
788
789 void VM::clearSourceProviderCaches()
790 {
791     sourceProviderCacheMap.clear();
792 }
793
794 Exception* VM::throwException(ExecState* exec, Exception* exception)
795 {
796     ASSERT(exec == topCallFrame || exec->isGlobalExec() || exec == exec->lexicalGlobalObject()->callFrameAtDebuggerEntry());
797     CallFrame* throwOriginFrame = exec->isGlobalExec() ? exec : topJSCallFrame();
798
799     if (Options::breakOnThrow()) {
800         CodeBlock* codeBlock = throwOriginFrame ? throwOriginFrame->codeBlock() : nullptr;
801         dataLog("Throwing exception in call frame ", RawPointer(throwOriginFrame), " for code block ", codeBlock, "\n");
802         CRASH();
803     }
804
805     interpreter->notifyDebuggerOfExceptionToBeThrown(*this, throwOriginFrame, exception);
806
807     setException(exception);
808
809 #if ENABLE(EXCEPTION_SCOPE_VERIFICATION)
810     m_nativeStackTraceOfLastThrow = StackTrace::captureStackTrace(Options::unexpectedExceptionStackTraceLimit());
811     m_throwingThread = &Thread::current();
812 #endif
813     return exception;
814 }
815
816 Exception* VM::throwException(ExecState* exec, JSValue thrownValue)
817 {
818     VM& vm = *this;
819     Exception* exception = jsDynamicCast<Exception*>(vm, thrownValue);
820     if (!exception)
821         exception = Exception::create(*this, thrownValue);
822
823     return throwException(exec, exception);
824 }
825
826 Exception* VM::throwException(ExecState* exec, JSObject* error)
827 {
828     return throwException(exec, JSValue(error));
829 }
830
831 void VM::setStackPointerAtVMEntry(void* sp)
832 {
833     m_stackPointerAtVMEntry = sp;
834     updateStackLimits();
835 }
836
837 size_t VM::updateSoftReservedZoneSize(size_t softReservedZoneSize)
838 {
839     size_t oldSoftReservedZoneSize = m_currentSoftReservedZoneSize;
840     m_currentSoftReservedZoneSize = softReservedZoneSize;
841 #if ENABLE(C_LOOP)
842     interpreter->cloopStack().setSoftReservedZoneSize(softReservedZoneSize);
843 #endif
844
845     updateStackLimits();
846
847     return oldSoftReservedZoneSize;
848 }
849
850 #if OS(WINDOWS)
851 // On Windows the reserved stack space consists of committed memory, a guard page, and uncommitted memory,
852 // where the guard page is a barrier between committed and uncommitted memory.
853 // When data from the guard page is read or written, the guard page is moved, and memory is committed.
854 // This is how the system grows the stack.
855 // When using the C stack on Windows we need to precommit the needed stack space.
856 // Otherwise we might crash later if we access uncommitted stack memory.
857 // This can happen if we allocate stack space larger than the page guard size (4K).
858 // The system does not get the chance to move the guard page, and commit more memory,
859 // and we crash if uncommitted memory is accessed.
860 // The MSVC compiler fixes this by inserting a call to the _chkstk() function,
861 // when needed, see http://support.microsoft.com/kb/100775.
862 // By touching every page up to the stack limit with a dummy operation,
863 // we force the system to move the guard page, and commit memory.
864
865 static void preCommitStackMemory(void* stackLimit)
866 {
867     const int pageSize = 4096;
868     for (volatile char* p = reinterpret_cast<char*>(&stackLimit); p > stackLimit; p -= pageSize) {
869         char ch = *p;
870         *p = ch;
871     }
872 }
873 #endif
874
875 inline void VM::updateStackLimits()
876 {
877 #if OS(WINDOWS)
878     void* lastSoftStackLimit = m_softStackLimit;
879 #endif
880
881     const StackBounds& stack = Thread::current().stack();
882     size_t reservedZoneSize = Options::reservedZoneSize();
883     // We should have already ensured that Options::reservedZoneSize() >= minimumReserveZoneSize at
884     // options initialization time, and the option value should not have been changed thereafter.
885     // We don't have the ability to assert here that it hasn't changed, but we can at least assert
886     // that the value is sane.
887     RELEASE_ASSERT(reservedZoneSize >= minimumReservedZoneSize);
888
889     if (m_stackPointerAtVMEntry) {
890         ASSERT(stack.isGrowingDownward());
891         char* startOfStack = reinterpret_cast<char*>(m_stackPointerAtVMEntry);
892         m_softStackLimit = stack.recursionLimit(startOfStack, Options::maxPerThreadStackUsage(), m_currentSoftReservedZoneSize);
893         m_stackLimit = stack.recursionLimit(startOfStack, Options::maxPerThreadStackUsage(), reservedZoneSize);
894     } else {
895         m_softStackLimit = stack.recursionLimit(m_currentSoftReservedZoneSize);
896         m_stackLimit = stack.recursionLimit(reservedZoneSize);
897     }
898
899 #if OS(WINDOWS)
900     // We only need to precommit stack memory dictated by the VM::m_softStackLimit limit.
901     // This is because VM::m_softStackLimit applies to stack usage by LLINT asm or JIT
902     // generated code which can allocate stack space that the C++ compiler does not know
903     // about. As such, we have to precommit that stack memory manually.
904     //
905     // In contrast, we do not need to worry about VM::m_stackLimit because that limit is
906     // used exclusively by C++ code, and the C++ compiler will automatically commit the
907     // needed stack pages.
908     if (lastSoftStackLimit != m_softStackLimit)
909         preCommitStackMemory(m_softStackLimit);
910 #endif
911 }
912
913 #if ENABLE(DFG_JIT)
914 void VM::gatherScratchBufferRoots(ConservativeRoots& conservativeRoots)
915 {
916     auto lock = holdLock(m_scratchBufferLock);
917     for (auto* scratchBuffer : m_scratchBuffers) {
918         if (scratchBuffer->activeLength()) {
919             void* bufferStart = scratchBuffer->dataBuffer();
920             conservativeRoots.add(bufferStart, static_cast<void*>(static_cast<char*>(bufferStart) + scratchBuffer->activeLength()));
921         }
922     }
923 }
924 #endif
925
926 void logSanitizeStack(VM* vm)
927 {
928     if (Options::verboseSanitizeStack() && vm->topCallFrame) {
929         int dummy;
930         auto& stackBounds = Thread::current().stack();
931         dataLog(
932             "Sanitizing stack for VM = ", RawPointer(vm), " with top call frame at ", RawPointer(vm->topCallFrame),
933             ", current stack pointer at ", RawPointer(&dummy), ", in ",
934             pointerDump(vm->topCallFrame->codeBlock()), ", last code origin = ",
935             vm->topCallFrame->codeOrigin(), ", last stack top = ", RawPointer(vm->lastStackTop()), ", in stack range [", RawPointer(stackBounds.origin()), ", ", RawPointer(stackBounds.end()), "]\n");
936     }
937 }
938
939 #if ENABLE(YARR_JIT_ALL_PARENS_EXPRESSIONS)
940 char* VM::acquireRegExpPatternContexBuffer()
941 {
942     m_regExpPatternContextLock.lock();
943     ASSERT(m_regExpPatternContextLock.isLocked());
944     if (!m_regExpPatternContexBuffer)
945         m_regExpPatternContexBuffer = makeUniqueArray<char>(VM::patternContextBufferSize);
946     return m_regExpPatternContexBuffer.get();
947 }
948
949 void VM::releaseRegExpPatternContexBuffer()
950 {
951     ASSERT(m_regExpPatternContextLock.isLocked());
952
953     m_regExpPatternContextLock.unlock();
954 }
955 #endif
956
957 #if ENABLE(REGEXP_TRACING)
958 void VM::addRegExpToTrace(RegExp* regExp)
959 {
960     gcProtect(regExp);
961     m_rtTraceList->add(regExp);
962 }
963
964 void VM::dumpRegExpTrace()
965 {
966     // The first RegExp object is ignored.  It is create by the RegExpPrototype ctor and not used.
967     RTTraceList::iterator iter = ++m_rtTraceList->begin();
968     
969     if (iter != m_rtTraceList->end()) {
970         dataLogF("\nRegExp Tracing\n");
971         dataLogF("Regular Expression                              8 Bit          16 Bit        match()    Matches    Average\n");
972         dataLogF(" <Match only / Match>                         JIT Addr      JIT Address       calls      found   String len\n");
973         dataLogF("----------------------------------------+----------------+----------------+----------+----------+-----------\n");
974     
975         unsigned reCount = 0;
976     
977         for (; iter != m_rtTraceList->end(); ++iter, ++reCount) {
978             (*iter)->printTraceData();
979             gcUnprotect(*iter);
980         }
981
982         dataLogF("%d Regular Expressions\n", reCount);
983     }
984     
985     m_rtTraceList->clear();
986 }
987 #else
988 void VM::dumpRegExpTrace()
989 {
990 }
991 #endif
992
993 WatchpointSet* VM::ensureWatchpointSetForImpureProperty(const Identifier& propertyName)
994 {
995     auto result = m_impurePropertyWatchpointSets.add(propertyName.string(), nullptr);
996     if (result.isNewEntry)
997         result.iterator->value = adoptRef(new WatchpointSet(IsWatched));
998     return result.iterator->value.get();
999 }
1000
1001 void VM::registerWatchpointForImpureProperty(const Identifier& propertyName, Watchpoint* watchpoint)
1002 {
1003     ensureWatchpointSetForImpureProperty(propertyName)->add(watchpoint);
1004 }
1005
1006 void VM::addImpureProperty(const String& propertyName)
1007 {
1008     if (RefPtr<WatchpointSet> watchpointSet = m_impurePropertyWatchpointSets.take(propertyName))
1009         watchpointSet->fireAll(*this, "Impure property added");
1010 }
1011
1012 template<typename Func>
1013 static bool enableProfilerWithRespectToCount(unsigned& counter, const Func& doEnableWork)
1014 {
1015     bool needsToRecompile = false;
1016     if (!counter) {
1017         doEnableWork();
1018         needsToRecompile = true;
1019     }
1020     counter++;
1021
1022     return needsToRecompile;
1023 }
1024
1025 template<typename Func>
1026 static bool disableProfilerWithRespectToCount(unsigned& counter, const Func& doDisableWork)
1027 {
1028     RELEASE_ASSERT(counter > 0);
1029     bool needsToRecompile = false;
1030     counter--;
1031     if (!counter) {
1032         doDisableWork();
1033         needsToRecompile = true;
1034     }
1035
1036     return needsToRecompile;
1037 }
1038
1039 bool VM::enableTypeProfiler()
1040 {
1041     auto enableTypeProfiler = [this] () {
1042         this->m_typeProfiler = std::make_unique<TypeProfiler>();
1043         this->m_typeProfilerLog = std::make_unique<TypeProfilerLog>(*this);
1044     };
1045
1046     return enableProfilerWithRespectToCount(m_typeProfilerEnabledCount, enableTypeProfiler);
1047 }
1048
1049 bool VM::disableTypeProfiler()
1050 {
1051     auto disableTypeProfiler = [this] () {
1052         this->m_typeProfiler.reset(nullptr);
1053         this->m_typeProfilerLog.reset(nullptr);
1054     };
1055
1056     return disableProfilerWithRespectToCount(m_typeProfilerEnabledCount, disableTypeProfiler);
1057 }
1058
1059 bool VM::enableControlFlowProfiler()
1060 {
1061     auto enableControlFlowProfiler = [this] () {
1062         this->m_controlFlowProfiler = std::make_unique<ControlFlowProfiler>();
1063     };
1064
1065     return enableProfilerWithRespectToCount(m_controlFlowProfilerEnabledCount, enableControlFlowProfiler);
1066 }
1067
1068 bool VM::disableControlFlowProfiler()
1069 {
1070     auto disableControlFlowProfiler = [this] () {
1071         this->m_controlFlowProfiler.reset(nullptr);
1072     };
1073
1074     return disableProfilerWithRespectToCount(m_controlFlowProfilerEnabledCount, disableControlFlowProfiler);
1075 }
1076
1077 void VM::dumpTypeProfilerData()
1078 {
1079     if (!typeProfiler())
1080         return;
1081
1082     typeProfilerLog()->processLogEntries(*this, "VM Dump Types"_s);
1083     typeProfiler()->dumpTypeProfilerData(*this);
1084 }
1085
1086 void VM::queueMicrotask(JSGlobalObject& globalObject, Ref<Microtask>&& task)
1087 {
1088     m_microtaskQueue.append(std::make_unique<QueuedTask>(*this, &globalObject, WTFMove(task)));
1089 }
1090
1091 void VM::drainMicrotasks()
1092 {
1093     while (!m_microtaskQueue.isEmpty()) {
1094         m_microtaskQueue.takeFirst()->run();
1095         if (m_onEachMicrotaskTick)
1096             m_onEachMicrotaskTick(*this);
1097     }
1098 }
1099
1100 void QueuedTask::run()
1101 {
1102     m_microtask->run(m_globalObject->globalExec());
1103 }
1104
1105 void sanitizeStackForVM(VM* vm)
1106 {
1107     logSanitizeStack(vm);
1108     if (vm->topCallFrame) {
1109         auto& stackBounds = Thread::current().stack();
1110         ASSERT(vm->currentThreadIsHoldingAPILock());
1111         ASSERT_UNUSED(stackBounds, stackBounds.contains(vm->lastStackTop()));
1112     }
1113 #if ENABLE(C_LOOP)
1114     vm->interpreter->cloopStack().sanitizeStack();
1115 #else
1116     sanitizeStackForVMImpl(vm);
1117 #endif
1118 }
1119
1120 size_t VM::committedStackByteCount()
1121 {
1122 #if !ENABLE(C_LOOP)
1123     // When using the C stack, we don't know how many stack pages are actually
1124     // committed. So, we use the current stack usage as an estimate.
1125     ASSERT(Thread::current().stack().isGrowingDownward());
1126     uint8_t* current = bitwise_cast<uint8_t*>(currentStackPointer());
1127     uint8_t* high = bitwise_cast<uint8_t*>(Thread::current().stack().origin());
1128     return high - current;
1129 #else
1130     return CLoopStack::committedByteCount();
1131 #endif
1132 }
1133
1134 #if ENABLE(C_LOOP)
1135 bool VM::ensureStackCapacityForCLoop(Register* newTopOfStack)
1136 {
1137     return interpreter->cloopStack().ensureCapacityFor(newTopOfStack);
1138 }
1139
1140 bool VM::isSafeToRecurseSoftCLoop() const
1141 {
1142     return interpreter->cloopStack().isSafeToRecurse();
1143 }
1144
1145 void* VM::currentCLoopStackPointer() const
1146 {
1147     return interpreter->cloopStack().currentStackPointer();
1148 }
1149 #endif // ENABLE(C_LOOP)
1150
1151 #if ENABLE(EXCEPTION_SCOPE_VERIFICATION)
1152 void VM::verifyExceptionCheckNeedIsSatisfied(unsigned recursionDepth, ExceptionEventLocation& location)
1153 {
1154     if (!Options::validateExceptionChecks())
1155         return;
1156
1157     if (UNLIKELY(m_needExceptionCheck)) {
1158         auto throwDepth = m_simulatedThrowPointRecursionDepth;
1159         auto& throwLocation = m_simulatedThrowPointLocation;
1160
1161         dataLog(
1162             "ERROR: Unchecked JS exception:\n"
1163             "    This scope can throw a JS exception: ", throwLocation, "\n"
1164             "        (ExceptionScope::m_recursionDepth was ", throwDepth, ")\n"
1165             "    But the exception was unchecked as of this scope: ", location, "\n"
1166             "        (ExceptionScope::m_recursionDepth was ", recursionDepth, ")\n"
1167             "\n");
1168
1169         StringPrintStream out;
1170         std::unique_ptr<StackTrace> currentTrace = StackTrace::captureStackTrace(Options::unexpectedExceptionStackTraceLimit());
1171
1172         if (Options::dumpSimulatedThrows()) {
1173             out.println("The simulated exception was thrown at:");
1174             m_nativeStackTraceOfLastSimulatedThrow->dump(out, "    ");
1175             out.println();
1176         }
1177         out.println("Unchecked exception detected at:");
1178         currentTrace->dump(out, "    ");
1179         out.println();
1180
1181         dataLog(out.toCString());
1182         RELEASE_ASSERT(!m_needExceptionCheck);
1183     }
1184 }
1185 #endif
1186
1187 #if USE(CF)
1188 void VM::setRunLoop(CFRunLoopRef runLoop)
1189 {
1190     ASSERT(runLoop);
1191     m_runLoop = runLoop;
1192     JSRunLoopTimer::Manager::shared().didChangeRunLoop(*this, runLoop);
1193 }
1194 #endif // USE(CF)
1195
1196 ScratchBuffer* VM::scratchBufferForSize(size_t size)
1197 {
1198     if (!size)
1199         return nullptr;
1200
1201     auto locker = holdLock(m_scratchBufferLock);
1202
1203     if (size > m_sizeOfLastScratchBuffer) {
1204         // Protect against a N^2 memory usage pathology by ensuring
1205         // that at worst, we get a geometric series, meaning that the
1206         // total memory usage is somewhere around
1207         // max(scratch buffer size) * 4.
1208         m_sizeOfLastScratchBuffer = size * 2;
1209
1210         ScratchBuffer* newBuffer = ScratchBuffer::create(m_sizeOfLastScratchBuffer);
1211         RELEASE_ASSERT(newBuffer);
1212         m_scratchBuffers.append(newBuffer);
1213     }
1214
1215     ScratchBuffer* result = m_scratchBuffers.last();
1216     return result;
1217 }
1218
1219 void VM::clearScratchBuffers()
1220 {
1221     auto lock = holdLock(m_scratchBufferLock);
1222     for (auto* scratchBuffer : m_scratchBuffers)
1223         scratchBuffer->setActiveLength(0);
1224 }
1225
1226 void VM::ensureShadowChicken()
1227 {
1228     if (m_shadowChicken)
1229         return;
1230     m_shadowChicken = std::make_unique<ShadowChicken>();
1231 }
1232
1233 #define DYNAMIC_ISO_SUBSPACE_DEFINE_MEMBER_SLOW(name, heapCellType, type) \
1234     IsoSubspace* VM::name##Slow() \
1235     { \
1236         ASSERT(!m_##name); \
1237         auto space = std::make_unique<IsoSubspace> ISO_SUBSPACE_INIT(heap, heapCellType, type); \
1238         WTF::storeStoreFence(); \
1239         m_##name = WTFMove(space); \
1240         return m_##name.get(); \
1241     }
1242
1243
1244 DYNAMIC_ISO_SUBSPACE_DEFINE_MEMBER_SLOW(boundFunctionSpace, cellHeapCellType.get(), JSBoundFunction)
1245 DYNAMIC_ISO_SUBSPACE_DEFINE_MEMBER_SLOW(callbackFunctionSpace, destructibleObjectHeapCellType.get(), JSCallbackFunction)
1246 DYNAMIC_ISO_SUBSPACE_DEFINE_MEMBER_SLOW(customGetterSetterFunctionSpace, cellHeapCellType.get(), JSCustomGetterSetterFunction)
1247 DYNAMIC_ISO_SUBSPACE_DEFINE_MEMBER_SLOW(errorInstanceSpace, destructibleObjectHeapCellType.get(), ErrorInstance)
1248 DYNAMIC_ISO_SUBSPACE_DEFINE_MEMBER_SLOW(nativeStdFunctionSpace, cellHeapCellType.get(), JSNativeStdFunction)
1249 DYNAMIC_ISO_SUBSPACE_DEFINE_MEMBER_SLOW(proxyRevokeSpace, destructibleObjectHeapCellType.get(), ProxyRevoke)
1250 DYNAMIC_ISO_SUBSPACE_DEFINE_MEMBER_SLOW(weakMapSpace, destructibleObjectHeapCellType.get(), JSWeakMap)
1251 DYNAMIC_ISO_SUBSPACE_DEFINE_MEMBER_SLOW(weakSetSpace, destructibleObjectHeapCellType.get(), JSWeakSet)
1252 #if JSC_OBJC_API_ENABLED
1253 DYNAMIC_ISO_SUBSPACE_DEFINE_MEMBER_SLOW(objCCallbackFunctionSpace, destructibleObjectHeapCellType.get(), ObjCCallbackFunction)
1254 #endif
1255 #if ENABLE(WEBASSEMBLY)
1256 DYNAMIC_ISO_SUBSPACE_DEFINE_MEMBER_SLOW(webAssemblyCodeBlockSpace, webAssemblyCodeBlockHeapCellType.get(), JSWebAssemblyCodeBlock)
1257 DYNAMIC_ISO_SUBSPACE_DEFINE_MEMBER_SLOW(webAssemblyFunctionSpace, webAssemblyFunctionHeapCellType.get(), WebAssemblyFunction)
1258 DYNAMIC_ISO_SUBSPACE_DEFINE_MEMBER_SLOW(webAssemblyWrapperFunctionSpace, cellHeapCellType.get(), WebAssemblyWrapperFunction)
1259 #endif
1260
1261 #undef DYNAMIC_ISO_SUBSPACE_DEFINE_MEMBER_SLOW
1262
1263 #define DYNAMIC_SPACE_AND_SET_DEFINE_MEMBER_SLOW(name, heapCellType, type) \
1264     IsoSubspace* VM::name##Slow() \
1265     { \
1266         ASSERT(!m_##name); \
1267         auto space = std::make_unique<SpaceAndSet> ISO_SUBSPACE_INIT(heap, heapCellType, type); \
1268         WTF::storeStoreFence(); \
1269         m_##name = WTFMove(space); \
1270         return &m_##name->space; \
1271     }
1272
1273 DYNAMIC_SPACE_AND_SET_DEFINE_MEMBER_SLOW(evalExecutableSpace, destructibleCellHeapCellType.get(), EvalExecutable)
1274 DYNAMIC_SPACE_AND_SET_DEFINE_MEMBER_SLOW(moduleProgramExecutableSpace, destructibleCellHeapCellType.get(), ModuleProgramExecutable)
1275
1276 #undef DYNAMIC_SPACE_AND_SET_DEFINE_MEMBER_SLOW
1277
1278 Structure* VM::setIteratorStructureSlow()
1279 {
1280     ASSERT(!m_setIteratorStructure);
1281     m_setIteratorStructure.set(*this, JSSetIterator::createStructure(*this, 0, jsNull()));
1282     return m_setIteratorStructure.get();
1283 }
1284
1285 Structure* VM::mapIteratorStructureSlow()
1286 {
1287     ASSERT(!m_mapIteratorStructure);
1288     m_mapIteratorStructure.set(*this, JSMapIterator::createStructure(*this, 0, jsNull()));
1289     return m_mapIteratorStructure.get();
1290 }
1291
1292 JSCell* VM::sentinelSetBucketSlow()
1293 {
1294     ASSERT(!m_sentinelSetBucket);
1295     auto* sentinel = JSSet::BucketType::createSentinel(*this);
1296     m_sentinelSetBucket.set(*this, sentinel);
1297     return sentinel;
1298 }
1299
1300 JSCell* VM::sentinelMapBucketSlow()
1301 {
1302     ASSERT(!m_sentinelMapBucket);
1303     auto* sentinel = JSMap::BucketType::createSentinel(*this);
1304     m_sentinelMapBucket.set(*this, sentinel);
1305     return sentinel;
1306 }
1307
1308 JSGlobalObject* VM::vmEntryGlobalObject(const CallFrame* callFrame) const
1309 {
1310     if (callFrame && callFrame->isGlobalExec()) {
1311         ASSERT(callFrame->callee().isCell() && callFrame->callee().asCell()->isObject());
1312         ASSERT(callFrame == callFrame->lexicalGlobalObject()->globalExec());
1313         return callFrame->lexicalGlobalObject();
1314     }
1315     ASSERT(entryScope);
1316     return entryScope->globalObject();
1317 }
1318
1319 void VM::setCrashOnVMCreation(bool shouldCrash)
1320 {
1321     vmCreationShouldCrash = shouldCrash;
1322 }
1323
1324 } // namespace JSC