Cap length of an array with spread to MIN_ARRAY_STORAGE_CONSTRUCTION_LENGTH.
[WebKit-https.git] / Source / JavaScriptCore / dfg / DFGSpeculativeJIT.cpp
1 /*
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11  *    documentation and/or other materials provided with the distribution.
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24  */
25
26 #include "config.h"
27 #include "DFGSpeculativeJIT.h"
28
29 #if ENABLE(DFG_JIT)
30
31 #include "BinarySwitch.h"
32 #include "DFGAbstractInterpreterInlines.h"
33 #include "DFGArrayifySlowPathGenerator.h"
34 #include "DFGCallArrayAllocatorSlowPathGenerator.h"
35 #include "DFGCallCreateDirectArgumentsSlowPathGenerator.h"
36 #include "DFGCapabilities.h"
37 #include "DFGMayExit.h"
38 #include "DFGOSRExitFuzz.h"
39 #include "DFGSaneStringGetByValSlowPathGenerator.h"
40 #include "DFGSlowPathGenerator.h"
41 #include "DFGSnippetParams.h"
42 #include "DirectArguments.h"
43 #include "JITAddGenerator.h"
44 #include "JITBitAndGenerator.h"
45 #include "JITBitOrGenerator.h"
46 #include "JITBitXorGenerator.h"
47 #include "JITDivGenerator.h"
48 #include "JITLeftShiftGenerator.h"
49 #include "JITMulGenerator.h"
50 #include "JITRightShiftGenerator.h"
51 #include "JITSubGenerator.h"
52 #include "JSAsyncFunction.h"
53 #include "JSAsyncGeneratorFunction.h"
54 #include "JSCInlines.h"
55 #include "JSFixedArray.h"
56 #include "JSGeneratorFunction.h"
57 #include "JSImmutableButterfly.h"
58 #include "JSLexicalEnvironment.h"
59 #include "JSPropertyNameEnumerator.h"
60 #include "LinkBuffer.h"
61 #include "RegExpObject.h"
62 #include "ScopedArguments.h"
63 #include "ScratchRegisterAllocator.h"
64 #include "SuperSampler.h"
65 #include "TypeProfilerLog.h"
66 #include "WeakMapImpl.h"
67 #include <wtf/BitVector.h>
68 #include <wtf/Box.h>
69 #include <wtf/MathExtras.h>
70
71 namespace JSC { namespace DFG {
72
73 SpeculativeJIT::SpeculativeJIT(JITCompiler& jit)
74     : m_jit(jit)
75     , m_graph(m_jit.graph())
76     , m_currentNode(0)
77     , m_lastGeneratedNode(LastNodeType)
78     , m_indexInBlock(0)
79     , m_generationInfo(m_jit.graph().frameRegisterCount())
80     , m_compileOkay(true)
81     , m_state(m_jit.graph())
82     , m_interpreter(m_jit.graph(), m_state)
83     , m_stream(&jit.jitCode()->variableEventStream)
84     , m_minifiedGraph(&jit.jitCode()->minifiedDFG)
85 {
86 }
87
88 SpeculativeJIT::~SpeculativeJIT()
89 {
90 }
91
92 void SpeculativeJIT::emitAllocateRawObject(GPRReg resultGPR, RegisteredStructure structure, GPRReg storageGPR, unsigned numElements, unsigned vectorLength)
93 {
94     ASSERT(!isCopyOnWrite(structure->indexingMode()));
95     IndexingType indexingType = structure->indexingType();
96     bool hasIndexingHeader = hasIndexedProperties(indexingType);
97
98     unsigned inlineCapacity = structure->inlineCapacity();
99     unsigned outOfLineCapacity = structure->outOfLineCapacity();
100     
101     GPRTemporary scratch(this);
102     GPRTemporary scratch2(this);
103     GPRReg scratchGPR = scratch.gpr();
104     GPRReg scratch2GPR = scratch2.gpr();
105
106     ASSERT(vectorLength >= numElements);
107     vectorLength = Butterfly::optimalContiguousVectorLength(structure.get(), vectorLength);
108     
109     JITCompiler::JumpList slowCases;
110
111     size_t size = 0;
112     if (hasIndexingHeader)
113         size += vectorLength * sizeof(JSValue) + sizeof(IndexingHeader);
114     size += outOfLineCapacity * sizeof(JSValue);
115
116     m_jit.move(TrustedImmPtr(nullptr), storageGPR);
117
118     if (size) {
119         if (Allocator allocator = m_jit.vm()->jsValueGigacageAuxiliarySpace.allocatorForNonVirtual(size, AllocatorForMode::AllocatorIfExists)) {
120             m_jit.emitAllocate(storageGPR, JITAllocator::constant(allocator), scratchGPR, scratch2GPR, slowCases);
121             
122             m_jit.addPtr(
123                 TrustedImm32(outOfLineCapacity * sizeof(JSValue) + sizeof(IndexingHeader)),
124                 storageGPR);
125             
126             if (hasIndexingHeader)
127                 m_jit.store32(TrustedImm32(vectorLength), MacroAssembler::Address(storageGPR, Butterfly::offsetOfVectorLength()));
128         } else
129             slowCases.append(m_jit.jump());
130     }
131
132     size_t allocationSize = JSFinalObject::allocationSize(inlineCapacity);
133     Allocator allocator = allocatorForNonVirtualConcurrently<JSFinalObject>(*m_jit.vm(), allocationSize, AllocatorForMode::AllocatorIfExists);
134     if (allocator) {
135         emitAllocateJSObject(resultGPR, JITAllocator::constant(allocator), scratchGPR, TrustedImmPtr(structure), storageGPR, scratch2GPR, slowCases);
136         m_jit.emitInitializeInlineStorage(resultGPR, structure->inlineCapacity());
137     } else
138         slowCases.append(m_jit.jump());
139
140     // I want a slow path that also loads out the storage pointer, and that's
141     // what this custom CallArrayAllocatorSlowPathGenerator gives me. It's a lot
142     // of work for a very small piece of functionality. :-/
143     addSlowPathGenerator(std::make_unique<CallArrayAllocatorSlowPathGenerator>(
144         slowCases, this, operationNewRawObject, resultGPR, storageGPR,
145         structure, vectorLength));
146
147     if (numElements < vectorLength) {
148 #if USE(JSVALUE64)
149         if (hasDouble(structure->indexingType()))
150             m_jit.move(TrustedImm64(bitwise_cast<int64_t>(PNaN)), scratchGPR);
151         else
152             m_jit.move(TrustedImm64(JSValue::encode(JSValue())), scratchGPR);
153         for (unsigned i = numElements; i < vectorLength; ++i)
154             m_jit.store64(scratchGPR, MacroAssembler::Address(storageGPR, sizeof(double) * i));
155 #else
156         EncodedValueDescriptor value;
157         if (hasDouble(structure->indexingType()))
158             value.asInt64 = JSValue::encode(JSValue(JSValue::EncodeAsDouble, PNaN));
159         else
160             value.asInt64 = JSValue::encode(JSValue());
161         for (unsigned i = numElements; i < vectorLength; ++i) {
162             m_jit.store32(TrustedImm32(value.asBits.tag), MacroAssembler::Address(storageGPR, sizeof(double) * i + OBJECT_OFFSETOF(JSValue, u.asBits.tag)));
163             m_jit.store32(TrustedImm32(value.asBits.payload), MacroAssembler::Address(storageGPR, sizeof(double) * i + OBJECT_OFFSETOF(JSValue, u.asBits.payload)));
164         }
165 #endif
166     }
167     
168     if (hasIndexingHeader)
169         m_jit.store32(TrustedImm32(numElements), MacroAssembler::Address(storageGPR, Butterfly::offsetOfPublicLength()));
170     
171     m_jit.emitInitializeOutOfLineStorage(storageGPR, structure->outOfLineCapacity());
172     
173     m_jit.mutatorFence(*m_jit.vm());
174 }
175
176 void SpeculativeJIT::emitGetLength(InlineCallFrame* inlineCallFrame, GPRReg lengthGPR, bool includeThis)
177 {
178     if (inlineCallFrame && !inlineCallFrame->isVarargs())
179         m_jit.move(TrustedImm32(inlineCallFrame->argumentCountIncludingThis - !includeThis), lengthGPR);
180     else {
181         VirtualRegister argumentCountRegister = m_jit.argumentCount(inlineCallFrame);
182         m_jit.load32(JITCompiler::payloadFor(argumentCountRegister), lengthGPR);
183         if (!includeThis)
184             m_jit.sub32(TrustedImm32(1), lengthGPR);
185     }
186 }
187
188 void SpeculativeJIT::emitGetLength(CodeOrigin origin, GPRReg lengthGPR, bool includeThis)
189 {
190     emitGetLength(origin.inlineCallFrame(), lengthGPR, includeThis);
191 }
192
193 void SpeculativeJIT::emitGetCallee(CodeOrigin origin, GPRReg calleeGPR)
194 {
195     auto* inlineCallFrame = origin.inlineCallFrame();
196     if (inlineCallFrame) {
197         if (inlineCallFrame->isClosureCall) {
198             m_jit.loadPtr(
199                 JITCompiler::addressFor(inlineCallFrame->calleeRecovery.virtualRegister()),
200                 calleeGPR);
201         } else {
202             m_jit.move(
203                 TrustedImmPtr::weakPointer(m_jit.graph(), inlineCallFrame->calleeRecovery.constant().asCell()),
204                 calleeGPR);
205         }
206     } else
207         m_jit.loadPtr(JITCompiler::addressFor(CallFrameSlot::callee), calleeGPR);
208 }
209
210 void SpeculativeJIT::emitGetArgumentStart(CodeOrigin origin, GPRReg startGPR)
211 {
212     m_jit.addPtr(
213         TrustedImm32(
214             JITCompiler::argumentsStart(origin).offset() * static_cast<int>(sizeof(Register))),
215         GPRInfo::callFrameRegister, startGPR);
216 }
217
218 MacroAssembler::Jump SpeculativeJIT::emitOSRExitFuzzCheck()
219 {
220     if (!Options::useOSRExitFuzz()
221         || !canUseOSRExitFuzzing(m_jit.graph().baselineCodeBlockFor(m_origin.semantic))
222         || !doOSRExitFuzzing())
223         return MacroAssembler::Jump();
224     
225     MacroAssembler::Jump result;
226     
227     m_jit.pushToSave(GPRInfo::regT0);
228     m_jit.load32(&g_numberOfOSRExitFuzzChecks, GPRInfo::regT0);
229     m_jit.add32(TrustedImm32(1), GPRInfo::regT0);
230     m_jit.store32(GPRInfo::regT0, &g_numberOfOSRExitFuzzChecks);
231     unsigned atOrAfter = Options::fireOSRExitFuzzAtOrAfter();
232     unsigned at = Options::fireOSRExitFuzzAt();
233     if (at || atOrAfter) {
234         unsigned threshold;
235         MacroAssembler::RelationalCondition condition;
236         if (atOrAfter) {
237             threshold = atOrAfter;
238             condition = MacroAssembler::Below;
239         } else {
240             threshold = at;
241             condition = MacroAssembler::NotEqual;
242         }
243         MacroAssembler::Jump ok = m_jit.branch32(
244             condition, GPRInfo::regT0, MacroAssembler::TrustedImm32(threshold));
245         m_jit.popToRestore(GPRInfo::regT0);
246         result = m_jit.jump();
247         ok.link(&m_jit);
248     }
249     m_jit.popToRestore(GPRInfo::regT0);
250     
251     return result;
252 }
253
254 void SpeculativeJIT::speculationCheck(ExitKind kind, JSValueSource jsValueSource, Node* node, MacroAssembler::Jump jumpToFail)
255 {
256     if (!m_compileOkay)
257         return;
258     JITCompiler::Jump fuzzJump = emitOSRExitFuzzCheck();
259     if (fuzzJump.isSet()) {
260         JITCompiler::JumpList jumpsToFail;
261         jumpsToFail.append(fuzzJump);
262         jumpsToFail.append(jumpToFail);
263         m_jit.appendExitInfo(jumpsToFail);
264     } else
265         m_jit.appendExitInfo(jumpToFail);
266     m_jit.jitCode()->appendOSRExit(OSRExit(kind, jsValueSource, m_jit.graph().methodOfGettingAValueProfileFor(m_currentNode, node), this, m_stream->size()));
267 }
268
269 void SpeculativeJIT::speculationCheck(ExitKind kind, JSValueSource jsValueSource, Node* node, const MacroAssembler::JumpList& jumpsToFail)
270 {
271     if (!m_compileOkay)
272         return;
273     JITCompiler::Jump fuzzJump = emitOSRExitFuzzCheck();
274     if (fuzzJump.isSet()) {
275         JITCompiler::JumpList myJumpsToFail;
276         myJumpsToFail.append(jumpsToFail);
277         myJumpsToFail.append(fuzzJump);
278         m_jit.appendExitInfo(myJumpsToFail);
279     } else
280         m_jit.appendExitInfo(jumpsToFail);
281     m_jit.jitCode()->appendOSRExit(OSRExit(kind, jsValueSource, m_jit.graph().methodOfGettingAValueProfileFor(m_currentNode, node), this, m_stream->size()));
282 }
283
284 OSRExitJumpPlaceholder SpeculativeJIT::speculationCheck(ExitKind kind, JSValueSource jsValueSource, Node* node)
285 {
286     if (!m_compileOkay)
287         return OSRExitJumpPlaceholder();
288     unsigned index = m_jit.jitCode()->osrExit.size();
289     m_jit.appendExitInfo();
290     m_jit.jitCode()->appendOSRExit(OSRExit(kind, jsValueSource, m_jit.graph().methodOfGettingAValueProfileFor(m_currentNode, node), this, m_stream->size()));
291     return OSRExitJumpPlaceholder(index);
292 }
293
294 OSRExitJumpPlaceholder SpeculativeJIT::speculationCheck(ExitKind kind, JSValueSource jsValueSource, Edge nodeUse)
295 {
296     return speculationCheck(kind, jsValueSource, nodeUse.node());
297 }
298
299 void SpeculativeJIT::speculationCheck(ExitKind kind, JSValueSource jsValueSource, Edge nodeUse, MacroAssembler::Jump jumpToFail)
300 {
301     speculationCheck(kind, jsValueSource, nodeUse.node(), jumpToFail);
302 }
303
304 void SpeculativeJIT::speculationCheck(ExitKind kind, JSValueSource jsValueSource, Edge nodeUse, const MacroAssembler::JumpList& jumpsToFail)
305 {
306     speculationCheck(kind, jsValueSource, nodeUse.node(), jumpsToFail);
307 }
308
309 void SpeculativeJIT::speculationCheck(ExitKind kind, JSValueSource jsValueSource, Node* node, MacroAssembler::Jump jumpToFail, const SpeculationRecovery& recovery)
310 {
311     if (!m_compileOkay)
312         return;
313     unsigned recoveryIndex = m_jit.jitCode()->appendSpeculationRecovery(recovery);
314     m_jit.appendExitInfo(jumpToFail);
315     m_jit.jitCode()->appendOSRExit(OSRExit(kind, jsValueSource, m_jit.graph().methodOfGettingAValueProfileFor(m_currentNode, node), this, m_stream->size(), recoveryIndex));
316 }
317
318 void SpeculativeJIT::speculationCheck(ExitKind kind, JSValueSource jsValueSource, Edge nodeUse, MacroAssembler::Jump jumpToFail, const SpeculationRecovery& recovery)
319 {
320     speculationCheck(kind, jsValueSource, nodeUse.node(), jumpToFail, recovery);
321 }
322
323 void SpeculativeJIT::emitInvalidationPoint(Node* node)
324 {
325     if (!m_compileOkay)
326         return;
327     OSRExitCompilationInfo& info = m_jit.appendExitInfo(JITCompiler::JumpList());
328     m_jit.jitCode()->appendOSRExit(OSRExit(
329         UncountableInvalidation, JSValueSource(), MethodOfGettingAValueProfile(),
330         this, m_stream->size()));
331     info.m_replacementSource = m_jit.watchpointLabel();
332     ASSERT(info.m_replacementSource.isSet());
333     noResult(node);
334 }
335
336 void SpeculativeJIT::unreachable(Node* node)
337 {
338     m_compileOkay = false;
339     m_jit.abortWithReason(DFGUnreachableNode, node->op());
340 }
341
342 void SpeculativeJIT::terminateSpeculativeExecution(ExitKind kind, JSValueRegs jsValueRegs, Node* node)
343 {
344     if (!m_compileOkay)
345         return;
346     speculationCheck(kind, jsValueRegs, node, m_jit.jump());
347     m_compileOkay = false;
348     if (verboseCompilationEnabled())
349         dataLog("Bailing compilation.\n");
350 }
351
352 void SpeculativeJIT::terminateSpeculativeExecution(ExitKind kind, JSValueRegs jsValueRegs, Edge nodeUse)
353 {
354     terminateSpeculativeExecution(kind, jsValueRegs, nodeUse.node());
355 }
356
357 void SpeculativeJIT::typeCheck(JSValueSource source, Edge edge, SpeculatedType typesPassedThrough, MacroAssembler::Jump jumpToFail, ExitKind exitKind)
358 {
359     ASSERT(needsTypeCheck(edge, typesPassedThrough));
360     m_interpreter.filter(edge, typesPassedThrough);
361     speculationCheck(exitKind, source, edge.node(), jumpToFail);
362 }
363
364 RegisterSet SpeculativeJIT::usedRegisters()
365 {
366     RegisterSet result;
367     
368     for (unsigned i = GPRInfo::numberOfRegisters; i--;) {
369         GPRReg gpr = GPRInfo::toRegister(i);
370         if (m_gprs.isInUse(gpr))
371             result.set(gpr);
372     }
373     for (unsigned i = FPRInfo::numberOfRegisters; i--;) {
374         FPRReg fpr = FPRInfo::toRegister(i);
375         if (m_fprs.isInUse(fpr))
376             result.set(fpr);
377     }
378     
379     // FIXME: This is overly conservative. We could subtract out those callee-saves that we
380     // actually saved.
381     // https://bugs.webkit.org/show_bug.cgi?id=185686
382     result.merge(RegisterSet::stubUnavailableRegisters());
383     
384     return result;
385 }
386
387 void SpeculativeJIT::addSlowPathGenerator(std::unique_ptr<SlowPathGenerator> slowPathGenerator)
388 {
389     m_slowPathGenerators.append(WTFMove(slowPathGenerator));
390 }
391
392 void SpeculativeJIT::addSlowPathGeneratorLambda(Function<void()>&& lambda)
393 {
394     m_slowPathLambdas.append(SlowPathLambda{ WTFMove(lambda), m_currentNode, static_cast<unsigned>(m_stream->size()) });
395 }
396
397 void SpeculativeJIT::runSlowPathGenerators(PCToCodeOriginMapBuilder& pcToCodeOriginMapBuilder)
398 {
399     for (auto& slowPathGenerator : m_slowPathGenerators) {
400         pcToCodeOriginMapBuilder.appendItem(m_jit.labelIgnoringWatchpoints(), slowPathGenerator->origin().semantic);
401         slowPathGenerator->generate(this);
402     }
403     for (auto& slowPathLambda : m_slowPathLambdas) {
404         Node* currentNode = slowPathLambda.currentNode;
405         m_currentNode = currentNode;
406         m_outOfLineStreamIndex = slowPathLambda.streamIndex;
407         pcToCodeOriginMapBuilder.appendItem(m_jit.labelIgnoringWatchpoints(), currentNode->origin.semantic);
408         slowPathLambda.generator();
409         m_outOfLineStreamIndex = WTF::nullopt;
410     }
411 }
412
413 void SpeculativeJIT::clearGenerationInfo()
414 {
415     for (unsigned i = 0; i < m_generationInfo.size(); ++i)
416         m_generationInfo[i] = GenerationInfo();
417     m_gprs = RegisterBank<GPRInfo>();
418     m_fprs = RegisterBank<FPRInfo>();
419 }
420
421 SilentRegisterSavePlan SpeculativeJIT::silentSavePlanForGPR(VirtualRegister spillMe, GPRReg source)
422 {
423     GenerationInfo& info = generationInfoFromVirtualRegister(spillMe);
424     Node* node = info.node();
425     DataFormat registerFormat = info.registerFormat();
426     ASSERT(registerFormat != DataFormatNone);
427     ASSERT(registerFormat != DataFormatDouble);
428         
429     SilentSpillAction spillAction;
430     SilentFillAction fillAction;
431         
432     if (!info.needsSpill())
433         spillAction = DoNothingForSpill;
434     else {
435 #if USE(JSVALUE64)
436         ASSERT(info.gpr() == source);
437         if (registerFormat == DataFormatInt32)
438             spillAction = Store32Payload;
439         else if (registerFormat == DataFormatCell || registerFormat == DataFormatStorage)
440             spillAction = StorePtr;
441         else if (registerFormat == DataFormatInt52 || registerFormat == DataFormatStrictInt52)
442             spillAction = Store64;
443         else {
444             ASSERT(registerFormat & DataFormatJS);
445             spillAction = Store64;
446         }
447 #elif USE(JSVALUE32_64)
448         if (registerFormat & DataFormatJS) {
449             ASSERT(info.tagGPR() == source || info.payloadGPR() == source);
450             spillAction = source == info.tagGPR() ? Store32Tag : Store32Payload;
451         } else {
452             ASSERT(info.gpr() == source);
453             spillAction = Store32Payload;
454         }
455 #endif
456     }
457         
458     if (registerFormat == DataFormatInt32) {
459         ASSERT(info.gpr() == source);
460         ASSERT(isJSInt32(info.registerFormat()));
461         if (node->hasConstant()) {
462             ASSERT(node->isInt32Constant());
463             fillAction = SetInt32Constant;
464         } else
465             fillAction = Load32Payload;
466     } else if (registerFormat == DataFormatBoolean) {
467 #if USE(JSVALUE64)
468         RELEASE_ASSERT_NOT_REACHED();
469 #if COMPILER_QUIRK(CONSIDERS_UNREACHABLE_CODE)
470         fillAction = DoNothingForFill;
471 #endif
472 #elif USE(JSVALUE32_64)
473         ASSERT(info.gpr() == source);
474         if (node->hasConstant()) {
475             ASSERT(node->isBooleanConstant());
476             fillAction = SetBooleanConstant;
477         } else
478             fillAction = Load32Payload;
479 #endif
480     } else if (registerFormat == DataFormatCell) {
481         ASSERT(info.gpr() == source);
482         if (node->hasConstant()) {
483             DFG_ASSERT(m_jit.graph(), m_currentNode, node->isCellConstant());
484             node->asCell(); // To get the assertion.
485             fillAction = SetCellConstant;
486         } else {
487 #if USE(JSVALUE64)
488             fillAction = LoadPtr;
489 #else
490             fillAction = Load32Payload;
491 #endif
492         }
493     } else if (registerFormat == DataFormatStorage) {
494         ASSERT(info.gpr() == source);
495         fillAction = LoadPtr;
496     } else if (registerFormat == DataFormatInt52) {
497         if (node->hasConstant())
498             fillAction = SetInt52Constant;
499         else if (info.spillFormat() == DataFormatInt52)
500             fillAction = Load64;
501         else if (info.spillFormat() == DataFormatStrictInt52)
502             fillAction = Load64ShiftInt52Left;
503         else if (info.spillFormat() == DataFormatNone)
504             fillAction = Load64;
505         else {
506             RELEASE_ASSERT_NOT_REACHED();
507 #if COMPILER_QUIRK(CONSIDERS_UNREACHABLE_CODE)
508             fillAction = Load64; // Make GCC happy.
509 #endif
510         }
511     } else if (registerFormat == DataFormatStrictInt52) {
512         if (node->hasConstant())
513             fillAction = SetStrictInt52Constant;
514         else if (info.spillFormat() == DataFormatInt52)
515             fillAction = Load64ShiftInt52Right;
516         else if (info.spillFormat() == DataFormatStrictInt52)
517             fillAction = Load64;
518         else if (info.spillFormat() == DataFormatNone)
519             fillAction = Load64;
520         else {
521             RELEASE_ASSERT_NOT_REACHED();
522 #if COMPILER_QUIRK(CONSIDERS_UNREACHABLE_CODE)
523             fillAction = Load64; // Make GCC happy.
524 #endif
525         }
526     } else {
527         ASSERT(registerFormat & DataFormatJS);
528 #if USE(JSVALUE64)
529         ASSERT(info.gpr() == source);
530         if (node->hasConstant()) {
531             if (node->isCellConstant())
532                 fillAction = SetTrustedJSConstant;
533             else
534                 fillAction = SetJSConstant;
535         } else if (info.spillFormat() == DataFormatInt32) {
536             ASSERT(registerFormat == DataFormatJSInt32);
537             fillAction = Load32PayloadBoxInt;
538         } else
539             fillAction = Load64;
540 #else
541         ASSERT(info.tagGPR() == source || info.payloadGPR() == source);
542         if (node->hasConstant())
543             fillAction = info.tagGPR() == source ? SetJSConstantTag : SetJSConstantPayload;
544         else if (info.payloadGPR() == source)
545             fillAction = Load32Payload;
546         else { // Fill the Tag
547             switch (info.spillFormat()) {
548             case DataFormatInt32:
549                 ASSERT(registerFormat == DataFormatJSInt32);
550                 fillAction = SetInt32Tag;
551                 break;
552             case DataFormatCell:
553                 ASSERT(registerFormat == DataFormatJSCell);
554                 fillAction = SetCellTag;
555                 break;
556             case DataFormatBoolean:
557                 ASSERT(registerFormat == DataFormatJSBoolean);
558                 fillAction = SetBooleanTag;
559                 break;
560             default:
561                 fillAction = Load32Tag;
562                 break;
563             }
564         }
565 #endif
566     }
567         
568     return SilentRegisterSavePlan(spillAction, fillAction, node, source);
569 }
570     
571 SilentRegisterSavePlan SpeculativeJIT::silentSavePlanForFPR(VirtualRegister spillMe, FPRReg source)
572 {
573     GenerationInfo& info = generationInfoFromVirtualRegister(spillMe);
574     Node* node = info.node();
575     ASSERT(info.registerFormat() == DataFormatDouble);
576
577     SilentSpillAction spillAction;
578     SilentFillAction fillAction;
579         
580     if (!info.needsSpill())
581         spillAction = DoNothingForSpill;
582     else {
583         ASSERT(!node->hasConstant());
584         ASSERT(info.spillFormat() == DataFormatNone);
585         ASSERT(info.fpr() == source);
586         spillAction = StoreDouble;
587     }
588         
589 #if USE(JSVALUE64)
590     if (node->hasConstant()) {
591         node->asNumber(); // To get the assertion.
592         fillAction = SetDoubleConstant;
593     } else {
594         ASSERT(info.spillFormat() == DataFormatNone || info.spillFormat() == DataFormatDouble);
595         fillAction = LoadDouble;
596     }
597 #elif USE(JSVALUE32_64)
598     ASSERT(info.registerFormat() == DataFormatDouble);
599     if (node->hasConstant()) {
600         node->asNumber(); // To get the assertion.
601         fillAction = SetDoubleConstant;
602     } else
603         fillAction = LoadDouble;
604 #endif
605
606     return SilentRegisterSavePlan(spillAction, fillAction, node, source);
607 }
608     
609 void SpeculativeJIT::silentSpill(const SilentRegisterSavePlan& plan)
610 {
611     switch (plan.spillAction()) {
612     case DoNothingForSpill:
613         break;
614     case Store32Tag:
615         m_jit.store32(plan.gpr(), JITCompiler::tagFor(plan.node()->virtualRegister()));
616         break;
617     case Store32Payload:
618         m_jit.store32(plan.gpr(), JITCompiler::payloadFor(plan.node()->virtualRegister()));
619         break;
620     case StorePtr:
621         m_jit.storePtr(plan.gpr(), JITCompiler::addressFor(plan.node()->virtualRegister()));
622         break;
623 #if USE(JSVALUE64)
624     case Store64:
625         m_jit.store64(plan.gpr(), JITCompiler::addressFor(plan.node()->virtualRegister()));
626         break;
627 #endif
628     case StoreDouble:
629         m_jit.storeDouble(plan.fpr(), JITCompiler::addressFor(plan.node()->virtualRegister()));
630         break;
631     default:
632         RELEASE_ASSERT_NOT_REACHED();
633     }
634 }
635     
636 void SpeculativeJIT::silentFill(const SilentRegisterSavePlan& plan)
637 {
638     switch (plan.fillAction()) {
639     case DoNothingForFill:
640         break;
641     case SetInt32Constant:
642         m_jit.move(Imm32(plan.node()->asInt32()), plan.gpr());
643         break;
644 #if USE(JSVALUE64)
645     case SetInt52Constant:
646         m_jit.move(Imm64(plan.node()->asAnyInt() << JSValue::int52ShiftAmount), plan.gpr());
647         break;
648     case SetStrictInt52Constant:
649         m_jit.move(Imm64(plan.node()->asAnyInt()), plan.gpr());
650         break;
651 #endif // USE(JSVALUE64)
652     case SetBooleanConstant:
653         m_jit.move(TrustedImm32(plan.node()->asBoolean()), plan.gpr());
654         break;
655     case SetCellConstant:
656         ASSERT(plan.node()->constant()->value().isCell());
657         m_jit.move(TrustedImmPtr(plan.node()->constant()), plan.gpr());
658         break;
659 #if USE(JSVALUE64)
660     case SetTrustedJSConstant:
661         m_jit.move(valueOfJSConstantAsImm64(plan.node()).asTrustedImm64(), plan.gpr());
662         break;
663     case SetJSConstant:
664         m_jit.move(valueOfJSConstantAsImm64(plan.node()), plan.gpr());
665         break;
666     case SetDoubleConstant:
667         m_jit.moveDouble(Imm64(reinterpretDoubleToInt64(plan.node()->asNumber())), plan.fpr());
668         break;
669     case Load32PayloadBoxInt:
670         m_jit.load32(JITCompiler::payloadFor(plan.node()->virtualRegister()), plan.gpr());
671         m_jit.or64(GPRInfo::tagTypeNumberRegister, plan.gpr());
672         break;
673     case Load32PayloadConvertToInt52:
674         m_jit.load32(JITCompiler::payloadFor(plan.node()->virtualRegister()), plan.gpr());
675         m_jit.signExtend32ToPtr(plan.gpr(), plan.gpr());
676         m_jit.lshift64(TrustedImm32(JSValue::int52ShiftAmount), plan.gpr());
677         break;
678     case Load32PayloadSignExtend:
679         m_jit.load32(JITCompiler::payloadFor(plan.node()->virtualRegister()), plan.gpr());
680         m_jit.signExtend32ToPtr(plan.gpr(), plan.gpr());
681         break;
682 #else
683     case SetJSConstantTag:
684         m_jit.move(Imm32(plan.node()->asJSValue().tag()), plan.gpr());
685         break;
686     case SetJSConstantPayload:
687         m_jit.move(Imm32(plan.node()->asJSValue().payload()), plan.gpr());
688         break;
689     case SetInt32Tag:
690         m_jit.move(TrustedImm32(JSValue::Int32Tag), plan.gpr());
691         break;
692     case SetCellTag:
693         m_jit.move(TrustedImm32(JSValue::CellTag), plan.gpr());
694         break;
695     case SetBooleanTag:
696         m_jit.move(TrustedImm32(JSValue::BooleanTag), plan.gpr());
697         break;
698     case SetDoubleConstant:
699         m_jit.loadDouble(TrustedImmPtr(m_jit.addressOfDoubleConstant(plan.node())), plan.fpr());
700         break;
701 #endif
702     case Load32Tag:
703         m_jit.load32(JITCompiler::tagFor(plan.node()->virtualRegister()), plan.gpr());
704         break;
705     case Load32Payload:
706         m_jit.load32(JITCompiler::payloadFor(plan.node()->virtualRegister()), plan.gpr());
707         break;
708     case LoadPtr:
709         m_jit.loadPtr(JITCompiler::addressFor(plan.node()->virtualRegister()), plan.gpr());
710         break;
711 #if USE(JSVALUE64)
712     case Load64:
713         m_jit.load64(JITCompiler::addressFor(plan.node()->virtualRegister()), plan.gpr());
714         break;
715     case Load64ShiftInt52Right:
716         m_jit.load64(JITCompiler::addressFor(plan.node()->virtualRegister()), plan.gpr());
717         m_jit.rshift64(TrustedImm32(JSValue::int52ShiftAmount), plan.gpr());
718         break;
719     case Load64ShiftInt52Left:
720         m_jit.load64(JITCompiler::addressFor(plan.node()->virtualRegister()), plan.gpr());
721         m_jit.lshift64(TrustedImm32(JSValue::int52ShiftAmount), plan.gpr());
722         break;
723 #endif
724     case LoadDouble:
725         m_jit.loadDouble(JITCompiler::addressFor(plan.node()->virtualRegister()), plan.fpr());
726         break;
727     default:
728         RELEASE_ASSERT_NOT_REACHED();
729     }
730 }
731
732 JITCompiler::JumpList SpeculativeJIT::jumpSlowForUnwantedArrayMode(GPRReg tempGPR, ArrayMode arrayMode)
733 {
734     JITCompiler::JumpList result;
735
736     IndexingType indexingModeMask = IsArray | IndexingShapeMask;
737     if (arrayMode.action() == Array::Write)
738         indexingModeMask |= CopyOnWrite;
739
740     switch (arrayMode.type()) {
741     case Array::Int32:
742     case Array::Double:
743     case Array::Contiguous:
744     case Array::Undecided:
745     case Array::ArrayStorage: {
746         IndexingType shape = arrayMode.shapeMask();
747         switch (arrayMode.arrayClass()) {
748         case Array::OriginalArray:
749         case Array::OriginalCopyOnWriteArray:
750             RELEASE_ASSERT_NOT_REACHED();
751             return result;
752
753         case Array::Array:
754             m_jit.and32(TrustedImm32(indexingModeMask), tempGPR);
755             result.append(m_jit.branch32(
756                 MacroAssembler::NotEqual, tempGPR, TrustedImm32(IsArray | shape)));
757             return result;
758
759         case Array::NonArray:
760         case Array::OriginalNonArray:
761             m_jit.and32(TrustedImm32(indexingModeMask), tempGPR);
762             result.append(m_jit.branch32(
763                 MacroAssembler::NotEqual, tempGPR, TrustedImm32(shape)));
764             return result;
765
766         case Array::PossiblyArray:
767             m_jit.and32(TrustedImm32(indexingModeMask & ~IsArray), tempGPR);
768             result.append(m_jit.branch32(MacroAssembler::NotEqual, tempGPR, TrustedImm32(shape)));
769             return result;
770         }
771
772         RELEASE_ASSERT_NOT_REACHED();
773         return result;
774     }
775
776     case Array::SlowPutArrayStorage: {
777         ASSERT(!arrayMode.isJSArrayWithOriginalStructure());
778
779         switch (arrayMode.arrayClass()) {
780         case Array::OriginalArray:
781         case Array::OriginalCopyOnWriteArray:
782             RELEASE_ASSERT_NOT_REACHED();
783             return result;
784
785         case Array::Array:
786             result.append(
787                 m_jit.branchTest32(
788                     MacroAssembler::Zero, tempGPR, MacroAssembler::TrustedImm32(IsArray)));
789             break;
790
791         case Array::NonArray:
792         case Array::OriginalNonArray:
793             result.append(
794                 m_jit.branchTest32(
795                     MacroAssembler::NonZero, tempGPR, MacroAssembler::TrustedImm32(IsArray)));
796             break;
797
798         case Array::PossiblyArray:
799             break;
800         }
801
802         m_jit.and32(TrustedImm32(IndexingShapeMask), tempGPR);
803         m_jit.sub32(TrustedImm32(ArrayStorageShape), tempGPR);
804         result.append(
805             m_jit.branch32(
806                 MacroAssembler::Above, tempGPR,
807                 TrustedImm32(SlowPutArrayStorageShape - ArrayStorageShape)));
808         return result;
809     }
810     default:
811         CRASH();
812         break;
813     }
814     
815     return result;
816 }
817
818 void SpeculativeJIT::checkArray(Node* node)
819 {
820     ASSERT(node->arrayMode().isSpecific());
821     ASSERT(!node->arrayMode().doesConversion());
822     
823     SpeculateCellOperand base(this, node->child1());
824     GPRReg baseReg = base.gpr();
825     
826     if (node->arrayMode().alreadyChecked(m_jit.graph(), node, m_state.forNode(node->child1()))) {
827         noResult(m_currentNode);
828         return;
829     }
830     
831     switch (node->arrayMode().type()) {
832     case Array::AnyTypedArray:
833     case Array::String:
834         RELEASE_ASSERT_NOT_REACHED(); // Should have been a Phantom(String:)
835         return;
836     case Array::Int32:
837     case Array::Double:
838     case Array::Contiguous:
839     case Array::Undecided:
840     case Array::ArrayStorage:
841     case Array::SlowPutArrayStorage: {
842         GPRTemporary temp(this);
843         GPRReg tempGPR = temp.gpr();
844         m_jit.load8(MacroAssembler::Address(baseReg, JSCell::indexingTypeAndMiscOffset()), tempGPR);
845         speculationCheck(
846             BadIndexingType, JSValueSource::unboxedCell(baseReg), 0,
847             jumpSlowForUnwantedArrayMode(tempGPR, node->arrayMode()));
848         
849         noResult(m_currentNode);
850         return;
851     }
852     case Array::DirectArguments:
853         speculateCellTypeWithoutTypeFiltering(node->child1(), baseReg, DirectArgumentsType);
854         noResult(m_currentNode);
855         return;
856     case Array::ScopedArguments:
857         speculateCellTypeWithoutTypeFiltering(node->child1(), baseReg, ScopedArgumentsType);
858         noResult(m_currentNode);
859         return;
860     default:
861         speculateCellTypeWithoutTypeFiltering(
862             node->child1(), baseReg,
863             typeForTypedArrayType(node->arrayMode().typedArrayType()));
864         noResult(m_currentNode);
865         return;
866     }
867 }
868
869 void SpeculativeJIT::arrayify(Node* node, GPRReg baseReg, GPRReg propertyReg)
870 {
871     ASSERT(node->arrayMode().doesConversion());
872     
873     GPRTemporary temp(this);
874     GPRTemporary structure;
875     GPRReg tempGPR = temp.gpr();
876     GPRReg structureGPR = InvalidGPRReg;
877     
878     if (node->op() != ArrayifyToStructure) {
879         GPRTemporary realStructure(this);
880         structure.adopt(realStructure);
881         structureGPR = structure.gpr();
882     }
883         
884     // We can skip all that comes next if we already have array storage.
885     MacroAssembler::JumpList slowPath;
886     
887     if (node->op() == ArrayifyToStructure) {
888         ASSERT(!isCopyOnWrite(node->structure()->indexingMode()));
889         ASSERT((node->structure()->indexingType() & IndexingShapeMask) == node->arrayMode().shapeMask());
890         slowPath.append(m_jit.branchWeakStructure(
891             JITCompiler::NotEqual,
892             JITCompiler::Address(baseReg, JSCell::structureIDOffset()),
893             node->structure()));
894     } else {
895         m_jit.load8(
896             MacroAssembler::Address(baseReg, JSCell::indexingTypeAndMiscOffset()), tempGPR);
897         
898         slowPath.append(jumpSlowForUnwantedArrayMode(tempGPR, node->arrayMode()));
899     }
900     
901     addSlowPathGenerator(std::make_unique<ArrayifySlowPathGenerator>(
902         slowPath, this, node, baseReg, propertyReg, tempGPR, structureGPR));
903     
904     noResult(m_currentNode);
905 }
906
907 void SpeculativeJIT::arrayify(Node* node)
908 {
909     ASSERT(node->arrayMode().isSpecific());
910     
911     SpeculateCellOperand base(this, node->child1());
912     
913     if (!node->child2()) {
914         arrayify(node, base.gpr(), InvalidGPRReg);
915         return;
916     }
917     
918     SpeculateInt32Operand property(this, node->child2());
919     
920     arrayify(node, base.gpr(), property.gpr());
921 }
922
923 GPRReg SpeculativeJIT::fillStorage(Edge edge)
924 {
925     VirtualRegister virtualRegister = edge->virtualRegister();
926     GenerationInfo& info = generationInfoFromVirtualRegister(virtualRegister);
927     
928     switch (info.registerFormat()) {
929     case DataFormatNone: {
930         if (info.spillFormat() == DataFormatStorage) {
931             GPRReg gpr = allocate();
932             m_gprs.retain(gpr, virtualRegister, SpillOrderSpilled);
933             m_jit.loadPtr(JITCompiler::addressFor(virtualRegister), gpr);
934             info.fillStorage(*m_stream, gpr);
935             return gpr;
936         }
937         
938         // Must be a cell; fill it as a cell and then return the pointer.
939         return fillSpeculateCell(edge);
940     }
941         
942     case DataFormatStorage: {
943         GPRReg gpr = info.gpr();
944         m_gprs.lock(gpr);
945         return gpr;
946     }
947         
948     default:
949         return fillSpeculateCell(edge);
950     }
951 }
952
953 void SpeculativeJIT::useChildren(Node* node)
954 {
955     if (node->flags() & NodeHasVarArgs) {
956         for (unsigned childIdx = node->firstChild(); childIdx < node->firstChild() + node->numChildren(); childIdx++) {
957             if (!!m_jit.graph().m_varArgChildren[childIdx])
958                 use(m_jit.graph().m_varArgChildren[childIdx]);
959         }
960     } else {
961         Edge child1 = node->child1();
962         if (!child1) {
963             ASSERT(!node->child2() && !node->child3());
964             return;
965         }
966         use(child1);
967         
968         Edge child2 = node->child2();
969         if (!child2) {
970             ASSERT(!node->child3());
971             return;
972         }
973         use(child2);
974         
975         Edge child3 = node->child3();
976         if (!child3)
977             return;
978         use(child3);
979     }
980 }
981
982 void SpeculativeJIT::compileGetById(Node* node, AccessType accessType)
983 {
984     ASSERT(accessType == AccessType::Get || accessType == AccessType::GetDirect || accessType == AccessType::TryGet);
985
986     switch (node->child1().useKind()) {
987     case CellUse: {
988         SpeculateCellOperand base(this, node->child1());
989         JSValueRegsTemporary result(this, Reuse, base);
990
991         JSValueRegs baseRegs = JSValueRegs::payloadOnly(base.gpr());
992         JSValueRegs resultRegs = result.regs();
993
994         base.use();
995
996         cachedGetById(node->origin.semantic, baseRegs, resultRegs, node->identifierNumber(), JITCompiler::Jump(), NeedToSpill, accessType);
997
998         jsValueResult(resultRegs, node, DataFormatJS, UseChildrenCalledExplicitly);
999         break;
1000     }
1001
1002     case UntypedUse: {
1003         JSValueOperand base(this, node->child1());
1004         JSValueRegsTemporary result(this, Reuse, base);
1005
1006         JSValueRegs baseRegs = base.jsValueRegs();
1007         JSValueRegs resultRegs = result.regs();
1008
1009         base.use();
1010
1011         JITCompiler::Jump notCell = m_jit.branchIfNotCell(baseRegs);
1012
1013         cachedGetById(node->origin.semantic, baseRegs, resultRegs, node->identifierNumber(), notCell, NeedToSpill, accessType);
1014
1015         jsValueResult(resultRegs, node, DataFormatJS, UseChildrenCalledExplicitly);
1016         break;
1017     }
1018
1019     default:
1020         DFG_CRASH(m_jit.graph(), node, "Bad use kind");
1021         break;
1022     }
1023 }
1024
1025 void SpeculativeJIT::compileGetByIdFlush(Node* node, AccessType accessType)
1026 {
1027     switch (node->child1().useKind()) {
1028     case CellUse: {
1029         SpeculateCellOperand base(this, node->child1());
1030         JSValueRegs baseRegs = JSValueRegs::payloadOnly(base.gpr());
1031
1032         JSValueRegsFlushedCallResult result(this);
1033         JSValueRegs resultRegs = result.regs();
1034
1035         base.use();
1036
1037         flushRegisters();
1038
1039         cachedGetById(node->origin.semantic, baseRegs, resultRegs, node->identifierNumber(), JITCompiler::Jump(), DontSpill, accessType);
1040
1041         jsValueResult(resultRegs, node, DataFormatJS, UseChildrenCalledExplicitly);
1042         break;
1043     }
1044
1045     case UntypedUse: {
1046         JSValueOperand base(this, node->child1());
1047         JSValueRegs baseRegs = base.jsValueRegs();
1048
1049         JSValueRegsFlushedCallResult result(this);
1050         JSValueRegs resultRegs = result.regs();
1051
1052         base.use();
1053
1054         flushRegisters();
1055
1056         JITCompiler::Jump notCell = m_jit.branchIfNotCell(baseRegs);
1057
1058         cachedGetById(node->origin.semantic, baseRegs, resultRegs, node->identifierNumber(), notCell, DontSpill, accessType);
1059
1060         jsValueResult(resultRegs, node, DataFormatJS, UseChildrenCalledExplicitly);
1061         break;
1062     }
1063
1064     default:
1065         DFG_CRASH(m_jit.graph(), node, "Bad use kind");
1066         break;
1067     }
1068 }
1069
1070 void SpeculativeJIT::compileInById(Node* node)
1071 {
1072     SpeculateCellOperand base(this, node->child1());
1073     JSValueRegsTemporary result(this, Reuse, base, PayloadWord);
1074
1075     GPRReg baseGPR = base.gpr();
1076     JSValueRegs resultRegs = result.regs();
1077
1078     base.use();
1079
1080     CodeOrigin codeOrigin = node->origin.semantic;
1081     CallSiteIndex callSite = m_jit.recordCallSiteAndGenerateExceptionHandlingOSRExitIfNeeded(codeOrigin, m_stream->size());
1082     RegisterSet usedRegisters = this->usedRegisters();
1083     JITInByIdGenerator gen(
1084         m_jit.codeBlock(), codeOrigin, callSite, usedRegisters, identifierUID(node->identifierNumber()),
1085         JSValueRegs::payloadOnly(baseGPR), resultRegs);
1086     gen.generateFastPath(m_jit);
1087
1088     auto slowPath = slowPathCall(
1089         gen.slowPathJump(), this, operationInByIdOptimize,
1090         NeedToSpill, ExceptionCheckRequirement::CheckNeeded,
1091         resultRegs, gen.stubInfo(), CCallHelpers::CellValue(baseGPR), identifierUID(node->identifierNumber()));
1092
1093     m_jit.addInById(gen, slowPath.get());
1094     addSlowPathGenerator(WTFMove(slowPath));
1095
1096     blessedBooleanResult(resultRegs.payloadGPR(), node, UseChildrenCalledExplicitly);
1097 }
1098
1099 void SpeculativeJIT::compileInByVal(Node* node)
1100 {
1101     SpeculateCellOperand base(this, node->child1());
1102     JSValueOperand key(this, node->child2());
1103
1104     GPRReg baseGPR = base.gpr();
1105     JSValueRegs regs = key.jsValueRegs();
1106
1107     base.use();
1108     key.use();
1109
1110     flushRegisters();
1111     JSValueRegsFlushedCallResult result(this);
1112     JSValueRegs resultRegs = result.regs();
1113     callOperation(operationInByVal, resultRegs, baseGPR, regs);
1114     m_jit.exceptionCheck();
1115     blessedBooleanResult(resultRegs.payloadGPR(), node, UseChildrenCalledExplicitly);
1116 }
1117
1118 void SpeculativeJIT::compileDeleteById(Node* node)
1119 {
1120     JSValueOperand value(this, node->child1());
1121     GPRFlushedCallResult result(this);
1122
1123     JSValueRegs valueRegs = value.jsValueRegs();
1124     GPRReg resultGPR = result.gpr();
1125
1126     value.use();
1127
1128     flushRegisters();
1129     callOperation(operationDeleteById, resultGPR, valueRegs, identifierUID(node->identifierNumber()));
1130     m_jit.exceptionCheck();
1131
1132     unblessedBooleanResult(resultGPR, node, UseChildrenCalledExplicitly);
1133 }
1134
1135 void SpeculativeJIT::compileDeleteByVal(Node* node)
1136 {
1137     JSValueOperand base(this, node->child1());
1138     JSValueOperand key(this, node->child2());
1139     GPRFlushedCallResult result(this);
1140
1141     JSValueRegs baseRegs = base.jsValueRegs();
1142     JSValueRegs keyRegs = key.jsValueRegs();
1143     GPRReg resultGPR = result.gpr();
1144
1145     base.use();
1146     key.use();
1147
1148     flushRegisters();
1149     callOperation(operationDeleteByVal, resultGPR, baseRegs, keyRegs);
1150     m_jit.exceptionCheck();
1151
1152     unblessedBooleanResult(resultGPR, node, UseChildrenCalledExplicitly);
1153 }
1154
1155 void SpeculativeJIT::compilePushWithScope(Node* node)
1156 {
1157     SpeculateCellOperand currentScope(this, node->child1());
1158     GPRReg currentScopeGPR = currentScope.gpr();
1159
1160     GPRFlushedCallResult result(this);
1161     GPRReg resultGPR = result.gpr();
1162
1163     auto objectEdge = node->child2();
1164     if (objectEdge.useKind() == ObjectUse) {
1165         SpeculateCellOperand object(this, objectEdge);
1166         GPRReg objectGPR = object.gpr();
1167         speculateObject(objectEdge, objectGPR);
1168
1169         flushRegisters();
1170         callOperation(operationPushWithScopeObject, resultGPR, currentScopeGPR, objectGPR);
1171         // No exception check here as we did not have to call toObject().
1172     } else {
1173         ASSERT(objectEdge.useKind() == UntypedUse);
1174         JSValueOperand object(this, objectEdge);
1175         JSValueRegs objectRegs = object.jsValueRegs();
1176
1177         flushRegisters();
1178         callOperation(operationPushWithScope, resultGPR, currentScopeGPR, objectRegs);
1179         m_jit.exceptionCheck();
1180     }
1181     
1182     cellResult(resultGPR, node);
1183 }
1184
1185 bool SpeculativeJIT::nonSpeculativeStrictEq(Node* node, bool invert)
1186 {
1187     unsigned branchIndexInBlock = detectPeepHoleBranch();
1188     if (branchIndexInBlock != UINT_MAX) {
1189         Node* branchNode = m_block->at(branchIndexInBlock);
1190
1191         ASSERT(node->adjustedRefCount() == 1);
1192         
1193         nonSpeculativePeepholeStrictEq(node, branchNode, invert);
1194     
1195         m_indexInBlock = branchIndexInBlock;
1196         m_currentNode = branchNode;
1197         
1198         return true;
1199     }
1200     
1201     nonSpeculativeNonPeepholeStrictEq(node, invert);
1202     
1203     return false;
1204 }
1205
1206 static const char* dataFormatString(DataFormat format)
1207 {
1208     // These values correspond to the DataFormat enum.
1209     const char* strings[] = {
1210         "[  ]",
1211         "[ i]",
1212         "[ d]",
1213         "[ c]",
1214         "Err!",
1215         "Err!",
1216         "Err!",
1217         "Err!",
1218         "[J ]",
1219         "[Ji]",
1220         "[Jd]",
1221         "[Jc]",
1222         "Err!",
1223         "Err!",
1224         "Err!",
1225         "Err!",
1226     };
1227     return strings[format];
1228 }
1229
1230 void SpeculativeJIT::dump(const char* label)
1231 {
1232     if (label)
1233         dataLogF("<%s>\n", label);
1234
1235     dataLogF("  gprs:\n");
1236     m_gprs.dump();
1237     dataLogF("  fprs:\n");
1238     m_fprs.dump();
1239     dataLogF("  VirtualRegisters:\n");
1240     for (unsigned i = 0; i < m_generationInfo.size(); ++i) {
1241         GenerationInfo& info = m_generationInfo[i];
1242         if (info.alive())
1243             dataLogF("    % 3d:%s%s", i, dataFormatString(info.registerFormat()), dataFormatString(info.spillFormat()));
1244         else
1245             dataLogF("    % 3d:[__][__]", i);
1246         if (info.registerFormat() == DataFormatDouble)
1247             dataLogF(":fpr%d\n", info.fpr());
1248         else if (info.registerFormat() != DataFormatNone
1249 #if USE(JSVALUE32_64)
1250             && !(info.registerFormat() & DataFormatJS)
1251 #endif
1252             ) {
1253             ASSERT(info.gpr() != InvalidGPRReg);
1254             dataLogF(":%s\n", GPRInfo::debugName(info.gpr()));
1255         } else
1256             dataLogF("\n");
1257     }
1258     if (label)
1259         dataLogF("</%s>\n", label);
1260 }
1261
1262 GPRTemporary::GPRTemporary()
1263     : m_jit(0)
1264     , m_gpr(InvalidGPRReg)
1265 {
1266 }
1267
1268 GPRTemporary::GPRTemporary(SpeculativeJIT* jit)
1269     : m_jit(jit)
1270     , m_gpr(InvalidGPRReg)
1271 {
1272     m_gpr = m_jit->allocate();
1273 }
1274
1275 GPRTemporary::GPRTemporary(SpeculativeJIT* jit, GPRReg specific)
1276     : m_jit(jit)
1277     , m_gpr(InvalidGPRReg)
1278 {
1279     m_gpr = m_jit->allocate(specific);
1280 }
1281
1282 #if USE(JSVALUE32_64)
1283 GPRTemporary::GPRTemporary(
1284     SpeculativeJIT* jit, ReuseTag, JSValueOperand& op1, WhichValueWord which)
1285     : m_jit(jit)
1286     , m_gpr(InvalidGPRReg)
1287 {
1288     if (!op1.isDouble() && m_jit->canReuse(op1.node()))
1289         m_gpr = m_jit->reuse(op1.gpr(which));
1290     else
1291         m_gpr = m_jit->allocate();
1292 }
1293 #else // USE(JSVALUE32_64)
1294 GPRTemporary::GPRTemporary(SpeculativeJIT* jit, ReuseTag, JSValueOperand& op1, WhichValueWord)
1295     : GPRTemporary(jit, Reuse, op1)
1296 {
1297 }
1298 #endif
1299
1300 JSValueRegsTemporary::JSValueRegsTemporary() { }
1301
1302 JSValueRegsTemporary::JSValueRegsTemporary(SpeculativeJIT* jit)
1303 #if USE(JSVALUE64)
1304     : m_gpr(jit)
1305 #else
1306     : m_payloadGPR(jit)
1307     , m_tagGPR(jit)
1308 #endif
1309 {
1310 }
1311
1312 #if USE(JSVALUE64)
1313 template<typename T>
1314 JSValueRegsTemporary::JSValueRegsTemporary(SpeculativeJIT* jit, ReuseTag, T& operand, WhichValueWord)
1315     : m_gpr(jit, Reuse, operand)
1316 {
1317 }
1318 #else
1319 template<typename T>
1320 JSValueRegsTemporary::JSValueRegsTemporary(SpeculativeJIT* jit, ReuseTag, T& operand, WhichValueWord resultWord)
1321 {
1322     if (resultWord == PayloadWord) {
1323         m_payloadGPR = GPRTemporary(jit, Reuse, operand);
1324         m_tagGPR = GPRTemporary(jit);
1325     } else {
1326         m_payloadGPR = GPRTemporary(jit);
1327         m_tagGPR = GPRTemporary(jit, Reuse, operand);
1328     }
1329 }
1330 #endif
1331
1332 #if USE(JSVALUE64)
1333 JSValueRegsTemporary::JSValueRegsTemporary(SpeculativeJIT* jit, ReuseTag, JSValueOperand& operand)
1334 {
1335     m_gpr = GPRTemporary(jit, Reuse, operand);
1336 }
1337 #else
1338 JSValueRegsTemporary::JSValueRegsTemporary(SpeculativeJIT* jit, ReuseTag, JSValueOperand& operand)
1339 {
1340     if (jit->canReuse(operand.node())) {
1341         m_payloadGPR = GPRTemporary(jit, Reuse, operand, PayloadWord);
1342         m_tagGPR = GPRTemporary(jit, Reuse, operand, TagWord);
1343     } else {
1344         m_payloadGPR = GPRTemporary(jit);
1345         m_tagGPR = GPRTemporary(jit);
1346     }
1347 }
1348 #endif
1349
1350 JSValueRegsTemporary::~JSValueRegsTemporary() { }
1351
1352 JSValueRegs JSValueRegsTemporary::regs()
1353 {
1354 #if USE(JSVALUE64)
1355     return JSValueRegs(m_gpr.gpr());
1356 #else
1357     return JSValueRegs(m_tagGPR.gpr(), m_payloadGPR.gpr());
1358 #endif
1359 }
1360
1361 void GPRTemporary::adopt(GPRTemporary& other)
1362 {
1363     ASSERT(!m_jit);
1364     ASSERT(m_gpr == InvalidGPRReg);
1365     ASSERT(other.m_jit);
1366     ASSERT(other.m_gpr != InvalidGPRReg);
1367     m_jit = other.m_jit;
1368     m_gpr = other.m_gpr;
1369     other.m_jit = 0;
1370     other.m_gpr = InvalidGPRReg;
1371 }
1372
1373 FPRTemporary::FPRTemporary(FPRTemporary&& other)
1374 {
1375     ASSERT(other.m_jit);
1376     ASSERT(other.m_fpr != InvalidFPRReg);
1377     m_jit = other.m_jit;
1378     m_fpr = other.m_fpr;
1379
1380     other.m_jit = nullptr;
1381 }
1382
1383 FPRTemporary::FPRTemporary(SpeculativeJIT* jit)
1384     : m_jit(jit)
1385     , m_fpr(InvalidFPRReg)
1386 {
1387     m_fpr = m_jit->fprAllocate();
1388 }
1389
1390 FPRTemporary::FPRTemporary(SpeculativeJIT* jit, SpeculateDoubleOperand& op1)
1391     : m_jit(jit)
1392     , m_fpr(InvalidFPRReg)
1393 {
1394     if (m_jit->canReuse(op1.node()))
1395         m_fpr = m_jit->reuse(op1.fpr());
1396     else
1397         m_fpr = m_jit->fprAllocate();
1398 }
1399
1400 FPRTemporary::FPRTemporary(SpeculativeJIT* jit, SpeculateDoubleOperand& op1, SpeculateDoubleOperand& op2)
1401     : m_jit(jit)
1402     , m_fpr(InvalidFPRReg)
1403 {
1404     if (m_jit->canReuse(op1.node()))
1405         m_fpr = m_jit->reuse(op1.fpr());
1406     else if (m_jit->canReuse(op2.node()))
1407         m_fpr = m_jit->reuse(op2.fpr());
1408     else if (m_jit->canReuse(op1.node(), op2.node()) && op1.fpr() == op2.fpr())
1409         m_fpr = m_jit->reuse(op1.fpr());
1410     else
1411         m_fpr = m_jit->fprAllocate();
1412 }
1413
1414 #if USE(JSVALUE32_64)
1415 FPRTemporary::FPRTemporary(SpeculativeJIT* jit, JSValueOperand& op1)
1416     : m_jit(jit)
1417     , m_fpr(InvalidFPRReg)
1418 {
1419     if (op1.isDouble() && m_jit->canReuse(op1.node()))
1420         m_fpr = m_jit->reuse(op1.fpr());
1421     else
1422         m_fpr = m_jit->fprAllocate();
1423 }
1424 #endif
1425
1426 void SpeculativeJIT::compilePeepHoleDoubleBranch(Node* node, Node* branchNode, JITCompiler::DoubleCondition condition)
1427 {
1428     BasicBlock* taken = branchNode->branchData()->taken.block;
1429     BasicBlock* notTaken = branchNode->branchData()->notTaken.block;
1430
1431     if (taken == nextBlock()) {
1432         condition = MacroAssembler::invert(condition);
1433         std::swap(taken, notTaken);
1434     }
1435
1436     SpeculateDoubleOperand op1(this, node->child1());
1437     SpeculateDoubleOperand op2(this, node->child2());
1438     
1439     branchDouble(condition, op1.fpr(), op2.fpr(), taken);
1440     jump(notTaken);
1441 }
1442
1443 void SpeculativeJIT::compilePeepHoleObjectEquality(Node* node, Node* branchNode)
1444 {
1445     BasicBlock* taken = branchNode->branchData()->taken.block;
1446     BasicBlock* notTaken = branchNode->branchData()->notTaken.block;
1447
1448     MacroAssembler::RelationalCondition condition = MacroAssembler::Equal;
1449     
1450     if (taken == nextBlock()) {
1451         condition = MacroAssembler::NotEqual;
1452         BasicBlock* tmp = taken;
1453         taken = notTaken;
1454         notTaken = tmp;
1455     }
1456
1457     SpeculateCellOperand op1(this, node->child1());
1458     SpeculateCellOperand op2(this, node->child2());
1459     
1460     GPRReg op1GPR = op1.gpr();
1461     GPRReg op2GPR = op2.gpr();
1462     
1463     if (masqueradesAsUndefinedWatchpointIsStillValid()) {
1464         if (m_state.forNode(node->child1()).m_type & ~SpecObject) {
1465             speculationCheck(
1466                 BadType, JSValueSource::unboxedCell(op1GPR), node->child1(), m_jit.branchIfNotObject(op1GPR));
1467         }
1468         if (m_state.forNode(node->child2()).m_type & ~SpecObject) {
1469             speculationCheck(
1470                 BadType, JSValueSource::unboxedCell(op2GPR), node->child2(), m_jit.branchIfNotObject(op2GPR));
1471         }
1472     } else {
1473         if (m_state.forNode(node->child1()).m_type & ~SpecObject) {
1474             speculationCheck(
1475                 BadType, JSValueSource::unboxedCell(op1GPR), node->child1(),
1476                 m_jit.branchIfNotObject(op1GPR));
1477         }
1478         speculationCheck(BadType, JSValueSource::unboxedCell(op1GPR), node->child1(),
1479             m_jit.branchTest8(
1480                 MacroAssembler::NonZero, 
1481                 MacroAssembler::Address(op1GPR, JSCell::typeInfoFlagsOffset()), 
1482                 MacroAssembler::TrustedImm32(MasqueradesAsUndefined)));
1483
1484         if (m_state.forNode(node->child2()).m_type & ~SpecObject) {
1485             speculationCheck(
1486                 BadType, JSValueSource::unboxedCell(op2GPR), node->child2(),
1487                 m_jit.branchIfNotObject(op2GPR));
1488         }
1489         speculationCheck(BadType, JSValueSource::unboxedCell(op2GPR), node->child2(),
1490             m_jit.branchTest8(
1491                 MacroAssembler::NonZero, 
1492                 MacroAssembler::Address(op2GPR, JSCell::typeInfoFlagsOffset()), 
1493                 MacroAssembler::TrustedImm32(MasqueradesAsUndefined)));
1494     }
1495
1496     branchPtr(condition, op1GPR, op2GPR, taken);
1497     jump(notTaken);
1498 }
1499
1500 void SpeculativeJIT::compilePeepHoleBooleanBranch(Node* node, Node* branchNode, JITCompiler::RelationalCondition condition)
1501 {
1502     BasicBlock* taken = branchNode->branchData()->taken.block;
1503     BasicBlock* notTaken = branchNode->branchData()->notTaken.block;
1504
1505     // The branch instruction will branch to the taken block.
1506     // If taken is next, switch taken with notTaken & invert the branch condition so we can fall through.
1507     if (taken == nextBlock()) {
1508         condition = JITCompiler::invert(condition);
1509         BasicBlock* tmp = taken;
1510         taken = notTaken;
1511         notTaken = tmp;
1512     }
1513
1514     if (node->child1()->isInt32Constant()) {
1515         int32_t imm = node->child1()->asInt32();
1516         SpeculateBooleanOperand op2(this, node->child2());
1517         branch32(condition, JITCompiler::Imm32(imm), op2.gpr(), taken);
1518     } else if (node->child2()->isInt32Constant()) {
1519         SpeculateBooleanOperand op1(this, node->child1());
1520         int32_t imm = node->child2()->asInt32();
1521         branch32(condition, op1.gpr(), JITCompiler::Imm32(imm), taken);
1522     } else {
1523         SpeculateBooleanOperand op1(this, node->child1());
1524         SpeculateBooleanOperand op2(this, node->child2());
1525         branch32(condition, op1.gpr(), op2.gpr(), taken);
1526     }
1527
1528     jump(notTaken);
1529 }
1530
1531 void SpeculativeJIT::compileStringSlice(Node* node)
1532 {
1533     SpeculateCellOperand string(this, node->child1());
1534
1535     GPRReg stringGPR = string.gpr();
1536
1537     speculateString(node->child1(), stringGPR);
1538
1539     SpeculateInt32Operand start(this, node->child2());
1540     GPRReg startGPR = start.gpr();
1541
1542     Optional<SpeculateInt32Operand> end;
1543     Optional<GPRReg> endGPR;
1544     if (node->child3()) {
1545         end.emplace(this, node->child3());
1546         endGPR.emplace(end->gpr());
1547     }
1548
1549     GPRTemporary temp(this);
1550     GPRReg tempGPR = temp.gpr();
1551
1552     m_jit.loadPtr(CCallHelpers::Address(stringGPR, JSString::offsetOfValue()), tempGPR);
1553     auto isRope = m_jit.branchIfRopeStringImpl(tempGPR);
1554
1555     GPRTemporary temp2(this);
1556     GPRTemporary startIndex(this);
1557
1558     GPRReg temp2GPR = temp2.gpr();
1559     GPRReg startIndexGPR = startIndex.gpr();
1560     {
1561         m_jit.load32(MacroAssembler::Address(tempGPR, StringImpl::lengthMemoryOffset()), temp2GPR);
1562
1563         emitPopulateSliceIndex(node->child2(), startGPR, temp2GPR, startIndexGPR);
1564
1565         if (node->child3())
1566             emitPopulateSliceIndex(node->child3(), endGPR.value(), temp2GPR, tempGPR);
1567         else
1568             m_jit.move(temp2GPR, tempGPR);
1569     }
1570
1571     CCallHelpers::JumpList doneCases;
1572     CCallHelpers::JumpList slowCases;
1573
1574     auto nonEmptyCase = m_jit.branch32(MacroAssembler::Below, startIndexGPR, tempGPR);
1575     m_jit.move(TrustedImmPtr::weakPointer(m_jit.graph(), jsEmptyString(&vm())), tempGPR);
1576     doneCases.append(m_jit.jump());
1577
1578     nonEmptyCase.link(&m_jit);
1579     m_jit.sub32(startIndexGPR, tempGPR); // the size of the sliced string.
1580     slowCases.append(m_jit.branch32(MacroAssembler::NotEqual, tempGPR, TrustedImm32(1)));
1581
1582     // Refill StringImpl* here.
1583     m_jit.loadPtr(MacroAssembler::Address(stringGPR, JSString::offsetOfValue()), temp2GPR);
1584     m_jit.loadPtr(MacroAssembler::Address(temp2GPR, StringImpl::dataOffset()), tempGPR);
1585
1586     // Load the character into scratchReg
1587     m_jit.zeroExtend32ToPtr(startIndexGPR, startIndexGPR);
1588     auto is16Bit = m_jit.branchTest32(MacroAssembler::Zero, MacroAssembler::Address(temp2GPR, StringImpl::flagsOffset()), TrustedImm32(StringImpl::flagIs8Bit()));
1589
1590     m_jit.load8(MacroAssembler::BaseIndex(tempGPR, startIndexGPR, MacroAssembler::TimesOne, 0), tempGPR);
1591     auto cont8Bit = m_jit.jump();
1592
1593     is16Bit.link(&m_jit);
1594     m_jit.load16(MacroAssembler::BaseIndex(tempGPR, startIndexGPR, MacroAssembler::TimesTwo, 0), tempGPR);
1595
1596     auto bigCharacter = m_jit.branch32(MacroAssembler::Above, tempGPR, TrustedImm32(maxSingleCharacterString));
1597
1598     // 8 bit string values don't need the isASCII check.
1599     cont8Bit.link(&m_jit);
1600
1601     m_jit.lshift32(MacroAssembler::TrustedImm32(sizeof(void*) == 4 ? 2 : 3), tempGPR);
1602     m_jit.addPtr(TrustedImmPtr(m_jit.vm()->smallStrings.singleCharacterStrings()), tempGPR);
1603     m_jit.loadPtr(tempGPR, tempGPR);
1604
1605     addSlowPathGenerator(slowPathCall(bigCharacter, this, operationSingleCharacterString, tempGPR, tempGPR));
1606
1607     addSlowPathGenerator(slowPathCall(slowCases, this, operationStringSubstr, tempGPR, stringGPR, startIndexGPR, tempGPR));
1608
1609     if (endGPR)
1610         addSlowPathGenerator(slowPathCall(isRope, this, operationStringSlice, tempGPR, stringGPR, startGPR, *endGPR));
1611     else
1612         addSlowPathGenerator(slowPathCall(isRope, this, operationStringSlice, tempGPR, stringGPR, startGPR, TrustedImm32(std::numeric_limits<int32_t>::max())));
1613
1614     doneCases.link(&m_jit);
1615     cellResult(tempGPR, node);
1616 }
1617
1618 void SpeculativeJIT::compileToLowerCase(Node* node)
1619 {
1620     ASSERT(node->op() == ToLowerCase);
1621     SpeculateCellOperand string(this, node->child1());
1622     GPRTemporary temp(this);
1623     GPRTemporary index(this);
1624     GPRTemporary charReg(this);
1625     GPRTemporary length(this);
1626
1627     GPRReg stringGPR = string.gpr();
1628     GPRReg tempGPR = temp.gpr();
1629     GPRReg indexGPR = index.gpr();
1630     GPRReg charGPR = charReg.gpr();
1631     GPRReg lengthGPR = length.gpr();
1632
1633     speculateString(node->child1(), stringGPR);
1634
1635     CCallHelpers::JumpList slowPath;
1636
1637     m_jit.move(TrustedImmPtr(nullptr), indexGPR);
1638
1639     m_jit.loadPtr(MacroAssembler::Address(stringGPR, JSString::offsetOfValue()), tempGPR);
1640     slowPath.append(m_jit.branchIfRopeStringImpl(tempGPR));
1641     slowPath.append(m_jit.branchTest32(
1642         MacroAssembler::Zero, MacroAssembler::Address(tempGPR, StringImpl::flagsOffset()),
1643         MacroAssembler::TrustedImm32(StringImpl::flagIs8Bit())));
1644     m_jit.load32(MacroAssembler::Address(tempGPR, StringImpl::lengthMemoryOffset()), lengthGPR);
1645     m_jit.loadPtr(MacroAssembler::Address(tempGPR, StringImpl::dataOffset()), tempGPR);
1646
1647     auto loopStart = m_jit.label();
1648     auto loopDone = m_jit.branch32(CCallHelpers::AboveOrEqual, indexGPR, lengthGPR);
1649     m_jit.load8(MacroAssembler::BaseIndex(tempGPR, indexGPR, MacroAssembler::TimesOne), charGPR);
1650     slowPath.append(m_jit.branchTest32(CCallHelpers::NonZero, charGPR, TrustedImm32(~0x7F)));
1651     m_jit.sub32(TrustedImm32('A'), charGPR);
1652     slowPath.append(m_jit.branch32(CCallHelpers::BelowOrEqual, charGPR, TrustedImm32('Z' - 'A')));
1653
1654     m_jit.add32(TrustedImm32(1), indexGPR);
1655     m_jit.jump().linkTo(loopStart, &m_jit);
1656     
1657     slowPath.link(&m_jit);
1658     silentSpillAllRegisters(lengthGPR);
1659     callOperation(operationToLowerCase, lengthGPR, stringGPR, indexGPR);
1660     silentFillAllRegisters();
1661     m_jit.exceptionCheck();
1662     auto done = m_jit.jump();
1663
1664     loopDone.link(&m_jit);
1665     m_jit.move(stringGPR, lengthGPR);
1666
1667     done.link(&m_jit);
1668     cellResult(lengthGPR, node);
1669 }
1670
1671 void SpeculativeJIT::compilePeepHoleInt32Branch(Node* node, Node* branchNode, JITCompiler::RelationalCondition condition)
1672 {
1673     BasicBlock* taken = branchNode->branchData()->taken.block;
1674     BasicBlock* notTaken = branchNode->branchData()->notTaken.block;
1675
1676     // The branch instruction will branch to the taken block.
1677     // If taken is next, switch taken with notTaken & invert the branch condition so we can fall through.
1678     if (taken == nextBlock()) {
1679         condition = JITCompiler::invert(condition);
1680         BasicBlock* tmp = taken;
1681         taken = notTaken;
1682         notTaken = tmp;
1683     }
1684
1685     if (node->child1()->isInt32Constant()) {
1686         int32_t imm = node->child1()->asInt32();
1687         SpeculateInt32Operand op2(this, node->child2());
1688         branch32(condition, JITCompiler::Imm32(imm), op2.gpr(), taken);
1689     } else if (node->child2()->isInt32Constant()) {
1690         SpeculateInt32Operand op1(this, node->child1());
1691         int32_t imm = node->child2()->asInt32();
1692         branch32(condition, op1.gpr(), JITCompiler::Imm32(imm), taken);
1693     } else {
1694         SpeculateInt32Operand op1(this, node->child1());
1695         SpeculateInt32Operand op2(this, node->child2());
1696         branch32(condition, op1.gpr(), op2.gpr(), taken);
1697     }
1698
1699     jump(notTaken);
1700 }
1701
1702 // Returns true if the compare is fused with a subsequent branch.
1703 bool SpeculativeJIT::compilePeepHoleBranch(Node* node, MacroAssembler::RelationalCondition condition, MacroAssembler::DoubleCondition doubleCondition, S_JITOperation_EJJ operation)
1704 {
1705     // Fused compare & branch.
1706     unsigned branchIndexInBlock = detectPeepHoleBranch();
1707     if (branchIndexInBlock != UINT_MAX) {
1708         Node* branchNode = m_block->at(branchIndexInBlock);
1709
1710         // detectPeepHoleBranch currently only permits the branch to be the very next node,
1711         // so can be no intervening nodes to also reference the compare. 
1712         ASSERT(node->adjustedRefCount() == 1);
1713
1714         if (node->isBinaryUseKind(Int32Use))
1715             compilePeepHoleInt32Branch(node, branchNode, condition);
1716 #if USE(JSVALUE64)
1717         else if (node->isBinaryUseKind(Int52RepUse))
1718             compilePeepHoleInt52Branch(node, branchNode, condition);
1719 #endif // USE(JSVALUE64)
1720         else if (node->isBinaryUseKind(StringUse) || node->isBinaryUseKind(StringIdentUse)) {
1721             // Use non-peephole comparison, for now.
1722             return false;
1723         } else if (node->isBinaryUseKind(DoubleRepUse))
1724             compilePeepHoleDoubleBranch(node, branchNode, doubleCondition);
1725         else if (node->op() == CompareEq) {
1726             if (node->isBinaryUseKind(BooleanUse))
1727                 compilePeepHoleBooleanBranch(node, branchNode, condition);
1728             else if (node->isBinaryUseKind(SymbolUse))
1729                 compilePeepHoleSymbolEquality(node, branchNode);
1730             else if (node->isBinaryUseKind(ObjectUse))
1731                 compilePeepHoleObjectEquality(node, branchNode);
1732             else if (node->isBinaryUseKind(ObjectUse, ObjectOrOtherUse))
1733                 compilePeepHoleObjectToObjectOrOtherEquality(node->child1(), node->child2(), branchNode);
1734             else if (node->isBinaryUseKind(ObjectOrOtherUse, ObjectUse))
1735                 compilePeepHoleObjectToObjectOrOtherEquality(node->child2(), node->child1(), branchNode);
1736             else if (!needsTypeCheck(node->child1(), SpecOther))
1737                 nonSpeculativePeepholeBranchNullOrUndefined(node->child2(), branchNode);
1738             else if (!needsTypeCheck(node->child2(), SpecOther))
1739                 nonSpeculativePeepholeBranchNullOrUndefined(node->child1(), branchNode);
1740             else {
1741                 nonSpeculativePeepholeBranch(node, branchNode, condition, operation);
1742                 return true;
1743             }
1744         } else {
1745             nonSpeculativePeepholeBranch(node, branchNode, condition, operation);
1746             return true;
1747         }
1748
1749         use(node->child1());
1750         use(node->child2());
1751         m_indexInBlock = branchIndexInBlock;
1752         m_currentNode = branchNode;
1753         return true;
1754     }
1755     return false;
1756 }
1757
1758 void SpeculativeJIT::noticeOSRBirth(Node* node)
1759 {
1760     if (!node->hasVirtualRegister())
1761         return;
1762     
1763     VirtualRegister virtualRegister = node->virtualRegister();
1764     GenerationInfo& info = generationInfoFromVirtualRegister(virtualRegister);
1765     
1766     info.noticeOSRBirth(*m_stream, node, virtualRegister);
1767 }
1768
1769 void SpeculativeJIT::compileMovHint(Node* node)
1770 {
1771     ASSERT(node->containsMovHint() && node->op() != ZombieHint);
1772     
1773     Node* child = node->child1().node();
1774     noticeOSRBirth(child);
1775     
1776     m_stream->appendAndLog(VariableEvent::movHint(MinifiedID(child), node->unlinkedLocal()));
1777 }
1778
1779 void SpeculativeJIT::bail(AbortReason reason)
1780 {
1781     if (verboseCompilationEnabled())
1782         dataLog("Bailing compilation.\n");
1783     m_compileOkay = true;
1784     m_jit.abortWithReason(reason, m_lastGeneratedNode);
1785     clearGenerationInfo();
1786 }
1787
1788 void SpeculativeJIT::compileCurrentBlock()
1789 {
1790     ASSERT(m_compileOkay);
1791     
1792     if (!m_block)
1793         return;
1794     
1795     ASSERT(m_block->isReachable);
1796     
1797     m_jit.blockHeads()[m_block->index] = m_jit.label();
1798
1799     if (!m_block->intersectionOfCFAHasVisited) {
1800         // Don't generate code for basic blocks that are unreachable according to CFA.
1801         // But to be sure that nobody has generated a jump to this block, drop in a
1802         // breakpoint here.
1803         m_jit.abortWithReason(DFGUnreachableBasicBlock);
1804         return;
1805     }
1806
1807     if (m_block->isCatchEntrypoint) {
1808         m_jit.addPtr(CCallHelpers::TrustedImm32(-(m_jit.graph().frameRegisterCount() * sizeof(Register))), GPRInfo::callFrameRegister,  CCallHelpers::stackPointerRegister);
1809         if (Options::zeroStackFrame())
1810             m_jit.clearStackFrame(GPRInfo::callFrameRegister, CCallHelpers::stackPointerRegister, GPRInfo::regT0, m_jit.graph().frameRegisterCount() * sizeof(Register));
1811         m_jit.emitSaveCalleeSaves();
1812         m_jit.emitMaterializeTagCheckRegisters();
1813         m_jit.emitPutToCallFrameHeader(m_jit.codeBlock(), CallFrameSlot::codeBlock);
1814     }
1815
1816     m_stream->appendAndLog(VariableEvent::reset());
1817     
1818     m_jit.jitAssertHasValidCallFrame();
1819     m_jit.jitAssertTagsInPlace();
1820     m_jit.jitAssertArgumentCountSane();
1821
1822     m_state.reset();
1823     m_state.beginBasicBlock(m_block);
1824     
1825     for (size_t i = m_block->variablesAtHead.size(); i--;) {
1826         int operand = m_block->variablesAtHead.operandForIndex(i);
1827         Node* node = m_block->variablesAtHead[i];
1828         if (!node)
1829             continue; // No need to record dead SetLocal's.
1830         
1831         VariableAccessData* variable = node->variableAccessData();
1832         DataFormat format;
1833         if (!node->refCount())
1834             continue; // No need to record dead SetLocal's.
1835         format = dataFormatFor(variable->flushFormat());
1836         m_stream->appendAndLog(
1837             VariableEvent::setLocal(
1838                 VirtualRegister(operand),
1839                 variable->machineLocal(),
1840                 format));
1841     }
1842
1843     m_origin = NodeOrigin();
1844     
1845     for (m_indexInBlock = 0; m_indexInBlock < m_block->size(); ++m_indexInBlock) {
1846         m_currentNode = m_block->at(m_indexInBlock);
1847         
1848         // We may have hit a contradiction that the CFA was aware of but that the JIT
1849         // didn't cause directly.
1850         if (!m_state.isValid()) {
1851             bail(DFGBailedAtTopOfBlock);
1852             return;
1853         }
1854
1855         m_interpreter.startExecuting();
1856         m_interpreter.executeKnownEdgeTypes(m_currentNode);
1857         m_jit.setForNode(m_currentNode);
1858         m_origin = m_currentNode->origin;
1859         m_lastGeneratedNode = m_currentNode->op();
1860         
1861         ASSERT(m_currentNode->shouldGenerate());
1862         
1863         if (verboseCompilationEnabled()) {
1864             dataLogF(
1865                 "SpeculativeJIT generating Node @%d (bc#%u) at JIT offset 0x%x",
1866                 (int)m_currentNode->index(),
1867                 m_currentNode->origin.semantic.bytecodeIndex(), m_jit.debugOffset());
1868             dataLog("\n");
1869         }
1870
1871         if (Options::validateDFGExceptionHandling() && (mayExit(m_jit.graph(), m_currentNode) != DoesNotExit || m_currentNode->isTerminal()))
1872             m_jit.jitReleaseAssertNoException(*m_jit.vm());
1873
1874         m_jit.pcToCodeOriginMapBuilder().appendItem(m_jit.labelIgnoringWatchpoints(), m_origin.semantic);
1875
1876         compile(m_currentNode);
1877         
1878         if (belongsInMinifiedGraph(m_currentNode->op()))
1879             m_minifiedGraph->append(MinifiedNode::fromNode(m_currentNode));
1880         
1881 #if ENABLE(DFG_REGISTER_ALLOCATION_VALIDATION)
1882         m_jit.clearRegisterAllocationOffsets();
1883 #endif
1884         
1885         if (!m_compileOkay) {
1886             bail(DFGBailedAtEndOfNode);
1887             return;
1888         }
1889         
1890         // Make sure that the abstract state is rematerialized for the next node.
1891         m_interpreter.executeEffects(m_indexInBlock);
1892     }
1893     
1894     // Perform the most basic verification that children have been used correctly.
1895     if (!ASSERT_DISABLED) {
1896         for (auto& info : m_generationInfo)
1897             RELEASE_ASSERT(!info.alive());
1898     }
1899 }
1900
1901 // If we are making type predictions about our arguments then
1902 // we need to check that they are correct on function entry.
1903 void SpeculativeJIT::checkArgumentTypes()
1904 {
1905     ASSERT(!m_currentNode);
1906     m_origin = NodeOrigin(CodeOrigin(0), CodeOrigin(0), true);
1907
1908     auto& arguments = m_jit.graph().m_rootToArguments.find(m_jit.graph().block(0))->value;
1909     for (int i = 0; i < m_jit.codeBlock()->numParameters(); ++i) {
1910         Node* node = arguments[i];
1911         if (!node) {
1912             // The argument is dead. We don't do any checks for such arguments.
1913             continue;
1914         }
1915         
1916         ASSERT(node->op() == SetArgument);
1917         ASSERT(node->shouldGenerate());
1918
1919         VariableAccessData* variableAccessData = node->variableAccessData();
1920         FlushFormat format = variableAccessData->flushFormat();
1921         
1922         if (format == FlushedJSValue)
1923             continue;
1924         
1925         VirtualRegister virtualRegister = variableAccessData->local();
1926
1927         JSValueSource valueSource = JSValueSource(JITCompiler::addressFor(virtualRegister));
1928         
1929 #if USE(JSVALUE64)
1930         switch (format) {
1931         case FlushedInt32: {
1932             speculationCheck(BadType, valueSource, node, m_jit.branch64(MacroAssembler::Below, JITCompiler::addressFor(virtualRegister), GPRInfo::tagTypeNumberRegister));
1933             break;
1934         }
1935         case FlushedBoolean: {
1936             GPRTemporary temp(this);
1937             m_jit.load64(JITCompiler::addressFor(virtualRegister), temp.gpr());
1938             m_jit.xor64(TrustedImm32(static_cast<int32_t>(ValueFalse)), temp.gpr());
1939             speculationCheck(BadType, valueSource, node, m_jit.branchTest64(MacroAssembler::NonZero, temp.gpr(), TrustedImm32(static_cast<int32_t>(~1))));
1940             break;
1941         }
1942         case FlushedCell: {
1943             speculationCheck(BadType, valueSource, node, m_jit.branchTest64(MacroAssembler::NonZero, JITCompiler::addressFor(virtualRegister), GPRInfo::tagMaskRegister));
1944             break;
1945         }
1946         default:
1947             RELEASE_ASSERT_NOT_REACHED();
1948             break;
1949         }
1950 #else
1951         switch (format) {
1952         case FlushedInt32: {
1953             speculationCheck(BadType, valueSource, node, m_jit.branch32(MacroAssembler::NotEqual, JITCompiler::tagFor(virtualRegister), TrustedImm32(JSValue::Int32Tag)));
1954             break;
1955         }
1956         case FlushedBoolean: {
1957             speculationCheck(BadType, valueSource, node, m_jit.branch32(MacroAssembler::NotEqual, JITCompiler::tagFor(virtualRegister), TrustedImm32(JSValue::BooleanTag)));
1958             break;
1959         }
1960         case FlushedCell: {
1961             speculationCheck(BadType, valueSource, node, m_jit.branch32(MacroAssembler::NotEqual, JITCompiler::tagFor(virtualRegister), TrustedImm32(JSValue::CellTag)));
1962             break;
1963         }
1964         default:
1965             RELEASE_ASSERT_NOT_REACHED();
1966             break;
1967         }
1968 #endif
1969     }
1970
1971     m_origin = NodeOrigin();
1972 }
1973
1974 bool SpeculativeJIT::compile()
1975 {
1976     checkArgumentTypes();
1977     
1978     ASSERT(!m_currentNode);
1979     for (BlockIndex blockIndex = 0; blockIndex < m_jit.graph().numBlocks(); ++blockIndex) {
1980         m_jit.setForBlockIndex(blockIndex);
1981         m_block = m_jit.graph().block(blockIndex);
1982         compileCurrentBlock();
1983     }
1984     linkBranches();
1985     return true;
1986 }
1987
1988 void SpeculativeJIT::createOSREntries()
1989 {
1990     for (BlockIndex blockIndex = 0; blockIndex < m_jit.graph().numBlocks(); ++blockIndex) {
1991         BasicBlock* block = m_jit.graph().block(blockIndex);
1992         if (!block)
1993             continue;
1994         if (block->isOSRTarget || block->isCatchEntrypoint) {
1995             // Currently we don't have OSR entry trampolines. We could add them
1996             // here if need be.
1997             m_osrEntryHeads.append(m_jit.blockHeads()[blockIndex]);
1998         }
1999     }
2000 }
2001
2002 void SpeculativeJIT::linkOSREntries(LinkBuffer& linkBuffer)
2003 {
2004     unsigned osrEntryIndex = 0;
2005     for (BlockIndex blockIndex = 0; blockIndex < m_jit.graph().numBlocks(); ++blockIndex) {
2006         BasicBlock* block = m_jit.graph().block(blockIndex);
2007         if (!block)
2008             continue;
2009         if (!block->isOSRTarget && !block->isCatchEntrypoint)
2010             continue;
2011         if (block->isCatchEntrypoint) {
2012             auto& argumentsVector = m_jit.graph().m_rootToArguments.find(block)->value;
2013             Vector<FlushFormat> argumentFormats;
2014             argumentFormats.reserveInitialCapacity(argumentsVector.size());
2015             for (Node* setArgument : argumentsVector) {
2016                 if (setArgument) {
2017                     FlushFormat flushFormat = setArgument->variableAccessData()->flushFormat();
2018                     ASSERT(flushFormat == FlushedInt32 || flushFormat == FlushedCell || flushFormat == FlushedBoolean || flushFormat == FlushedJSValue);
2019                     argumentFormats.uncheckedAppend(flushFormat);
2020                 } else
2021                     argumentFormats.uncheckedAppend(DeadFlush);
2022             }
2023             m_jit.noticeCatchEntrypoint(*block, m_osrEntryHeads[osrEntryIndex++], linkBuffer, WTFMove(argumentFormats));
2024         } else {
2025             ASSERT(block->isOSRTarget);
2026             m_jit.noticeOSREntry(*block, m_osrEntryHeads[osrEntryIndex++], linkBuffer);
2027         }
2028     }
2029
2030     m_jit.jitCode()->finalizeOSREntrypoints();
2031     m_jit.jitCode()->common.finalizeCatchEntrypoints();
2032
2033     ASSERT(osrEntryIndex == m_osrEntryHeads.size());
2034     
2035     if (verboseCompilationEnabled()) {
2036         DumpContext dumpContext;
2037         dataLog("OSR Entries:\n");
2038         for (OSREntryData& entryData : m_jit.jitCode()->osrEntry)
2039             dataLog("    ", inContext(entryData, &dumpContext), "\n");
2040         if (!dumpContext.isEmpty())
2041             dumpContext.dump(WTF::dataFile());
2042     }
2043 }
2044     
2045 void SpeculativeJIT::compileCheckTraps(Node* node)
2046 {
2047     ASSERT(Options::usePollingTraps());
2048     GPRTemporary unused(this);
2049     GPRReg unusedGPR = unused.gpr();
2050
2051     JITCompiler::Jump needTrapHandling = m_jit.branchTest8(JITCompiler::NonZero,
2052         JITCompiler::AbsoluteAddress(m_jit.vm()->needTrapHandlingAddress()));
2053
2054     addSlowPathGenerator(slowPathCall(needTrapHandling, this, operationHandleTraps, unusedGPR));
2055     noResult(node);
2056 }
2057
2058 void SpeculativeJIT::compileDoublePutByVal(Node* node, SpeculateCellOperand& base, SpeculateStrictInt32Operand& property)
2059 {
2060     Edge child3 = m_jit.graph().varArgChild(node, 2);
2061     Edge child4 = m_jit.graph().varArgChild(node, 3);
2062
2063     ArrayMode arrayMode = node->arrayMode();
2064     
2065     GPRReg baseReg = base.gpr();
2066     GPRReg propertyReg = property.gpr();
2067     
2068     SpeculateDoubleOperand value(this, child3);
2069
2070     FPRReg valueReg = value.fpr();
2071     
2072     DFG_TYPE_CHECK(
2073         JSValueRegs(), child3, SpecFullRealNumber,
2074         m_jit.branchIfNaN(valueReg));
2075     
2076     if (!m_compileOkay)
2077         return;
2078     
2079     StorageOperand storage(this, child4);
2080     GPRReg storageReg = storage.gpr();
2081
2082     if (node->op() == PutByValAlias) {
2083         // Store the value to the array.
2084         GPRReg propertyReg = property.gpr();
2085         FPRReg valueReg = value.fpr();
2086         m_jit.storeDouble(valueReg, MacroAssembler::BaseIndex(storageReg, propertyReg, MacroAssembler::TimesEight));
2087         
2088         noResult(m_currentNode);
2089         return;
2090     }
2091     
2092     GPRTemporary temporary;
2093     GPRReg temporaryReg = temporaryRegisterForPutByVal(temporary, node);
2094
2095     MacroAssembler::Jump slowCase;
2096     
2097     if (arrayMode.isInBounds()) {
2098         speculationCheck(
2099             OutOfBounds, JSValueRegs(), 0,
2100             m_jit.branch32(MacroAssembler::AboveOrEqual, propertyReg, MacroAssembler::Address(storageReg, Butterfly::offsetOfPublicLength())));
2101     } else {
2102         MacroAssembler::Jump inBounds = m_jit.branch32(MacroAssembler::Below, propertyReg, MacroAssembler::Address(storageReg, Butterfly::offsetOfPublicLength()));
2103         
2104         slowCase = m_jit.branch32(MacroAssembler::AboveOrEqual, propertyReg, MacroAssembler::Address(storageReg, Butterfly::offsetOfVectorLength()));
2105         
2106         if (!arrayMode.isOutOfBounds())
2107             speculationCheck(OutOfBounds, JSValueRegs(), 0, slowCase);
2108         
2109         m_jit.add32(TrustedImm32(1), propertyReg, temporaryReg);
2110         m_jit.store32(temporaryReg, MacroAssembler::Address(storageReg, Butterfly::offsetOfPublicLength()));
2111
2112         inBounds.link(&m_jit);
2113     }
2114     
2115     m_jit.storeDouble(valueReg, MacroAssembler::BaseIndex(storageReg, propertyReg, MacroAssembler::TimesEight));
2116
2117     base.use();
2118     property.use();
2119     value.use();
2120     storage.use();
2121     
2122     if (arrayMode.isOutOfBounds()) {
2123         addSlowPathGenerator(
2124             slowPathCall(
2125                 slowCase, this,
2126                 m_jit.codeBlock()->isStrictMode()
2127                     ? (node->op() == PutByValDirect ? operationPutDoubleByValDirectBeyondArrayBoundsStrict : operationPutDoubleByValBeyondArrayBoundsStrict)
2128                     : (node->op() == PutByValDirect ? operationPutDoubleByValDirectBeyondArrayBoundsNonStrict : operationPutDoubleByValBeyondArrayBoundsNonStrict),
2129                 NoResult, baseReg, propertyReg, valueReg));
2130     }
2131
2132     noResult(m_currentNode, UseChildrenCalledExplicitly);
2133 }
2134
2135 void SpeculativeJIT::compileGetCharCodeAt(Node* node)
2136 {
2137     SpeculateCellOperand string(this, node->child1());
2138     SpeculateStrictInt32Operand index(this, node->child2());
2139     StorageOperand storage(this, node->child3());
2140
2141     GPRReg stringReg = string.gpr();
2142     GPRReg indexReg = index.gpr();
2143     GPRReg storageReg = storage.gpr();
2144     
2145     ASSERT(speculationChecked(m_state.forNode(node->child1()).m_type, SpecString));
2146
2147     GPRTemporary scratch(this);
2148     GPRReg scratchReg = scratch.gpr();
2149
2150     m_jit.loadPtr(MacroAssembler::Address(stringReg, JSString::offsetOfValue()), scratchReg);
2151     
2152     // unsigned comparison so we can filter out negative indices and indices that are too large
2153     speculationCheck(Uncountable, JSValueRegs(), 0, m_jit.branch32(MacroAssembler::AboveOrEqual, indexReg, CCallHelpers::Address(scratchReg, StringImpl::lengthMemoryOffset())));
2154
2155     // Load the character into scratchReg
2156     JITCompiler::Jump is16Bit = m_jit.branchTest32(MacroAssembler::Zero, MacroAssembler::Address(scratchReg, StringImpl::flagsOffset()), TrustedImm32(StringImpl::flagIs8Bit()));
2157
2158     m_jit.load8(MacroAssembler::BaseIndex(storageReg, indexReg, MacroAssembler::TimesOne, 0), scratchReg);
2159     JITCompiler::Jump cont8Bit = m_jit.jump();
2160
2161     is16Bit.link(&m_jit);
2162
2163     m_jit.load16(MacroAssembler::BaseIndex(storageReg, indexReg, MacroAssembler::TimesTwo, 0), scratchReg);
2164
2165     cont8Bit.link(&m_jit);
2166
2167     int32Result(scratchReg, m_currentNode);
2168 }
2169
2170 void SpeculativeJIT::compileGetByValOnString(Node* node)
2171 {
2172     SpeculateCellOperand base(this, m_graph.child(node, 0));
2173     SpeculateStrictInt32Operand property(this, m_graph.child(node, 1));
2174     StorageOperand storage(this, m_graph.child(node, 2));
2175     GPRReg baseReg = base.gpr();
2176     GPRReg propertyReg = property.gpr();
2177     GPRReg storageReg = storage.gpr();
2178
2179     GPRTemporary scratch(this);
2180     GPRReg scratchReg = scratch.gpr();
2181 #if USE(JSVALUE32_64)
2182     GPRTemporary resultTag;
2183     GPRReg resultTagReg = InvalidGPRReg;
2184     if (node->arrayMode().isOutOfBounds()) {
2185         GPRTemporary realResultTag(this);
2186         resultTag.adopt(realResultTag);
2187         resultTagReg = resultTag.gpr();
2188     }
2189 #endif
2190
2191     ASSERT(ArrayMode(Array::String, Array::Read).alreadyChecked(m_jit.graph(), node, m_state.forNode(m_graph.child(node, 0))));
2192
2193     // unsigned comparison so we can filter out negative indices and indices that are too large
2194     m_jit.loadPtr(MacroAssembler::Address(baseReg, JSString::offsetOfValue()), scratchReg);
2195     JITCompiler::Jump outOfBounds = m_jit.branch32(
2196         MacroAssembler::AboveOrEqual, propertyReg,
2197         MacroAssembler::Address(scratchReg, StringImpl::lengthMemoryOffset()));
2198     if (node->arrayMode().isInBounds())
2199         speculationCheck(OutOfBounds, JSValueRegs(), 0, outOfBounds);
2200
2201     // Load the character into scratchReg
2202     JITCompiler::Jump is16Bit = m_jit.branchTest32(MacroAssembler::Zero, MacroAssembler::Address(scratchReg, StringImpl::flagsOffset()), TrustedImm32(StringImpl::flagIs8Bit()));
2203
2204     m_jit.load8(MacroAssembler::BaseIndex(storageReg, propertyReg, MacroAssembler::TimesOne, 0), scratchReg);
2205     JITCompiler::Jump cont8Bit = m_jit.jump();
2206
2207     is16Bit.link(&m_jit);
2208
2209     m_jit.load16(MacroAssembler::BaseIndex(storageReg, propertyReg, MacroAssembler::TimesTwo, 0), scratchReg);
2210
2211     JITCompiler::Jump bigCharacter =
2212         m_jit.branch32(MacroAssembler::Above, scratchReg, TrustedImm32(maxSingleCharacterString));
2213
2214     // 8 bit string values don't need the isASCII check.
2215     cont8Bit.link(&m_jit);
2216
2217     m_jit.lshift32(MacroAssembler::TrustedImm32(sizeof(void*) == 4 ? 2 : 3), scratchReg);
2218     m_jit.addPtr(TrustedImmPtr(m_jit.vm()->smallStrings.singleCharacterStrings()), scratchReg);
2219     m_jit.loadPtr(scratchReg, scratchReg);
2220
2221     addSlowPathGenerator(
2222         slowPathCall(
2223             bigCharacter, this, operationSingleCharacterString, scratchReg, scratchReg));
2224
2225     if (node->arrayMode().isOutOfBounds()) {
2226 #if USE(JSVALUE32_64)
2227         m_jit.move(TrustedImm32(JSValue::CellTag), resultTagReg);
2228 #endif
2229
2230         JSGlobalObject* globalObject = m_jit.globalObjectFor(node->origin.semantic);
2231         bool prototypeChainIsSane = false;
2232         if (globalObject->stringPrototypeChainIsSane()) {
2233             // FIXME: This could be captured using a Speculation mode that means "out-of-bounds
2234             // loads return a trivial value". Something like SaneChainOutOfBounds. This should
2235             // speculate that we don't take negative out-of-bounds, or better yet, it should rely
2236             // on a stringPrototypeChainIsSane() guaranteeing that the prototypes have no negative
2237             // indexed properties either.
2238             // https://bugs.webkit.org/show_bug.cgi?id=144668
2239             m_jit.graph().registerAndWatchStructureTransition(globalObject->stringPrototype()->structure(*m_jit.vm()));
2240             m_jit.graph().registerAndWatchStructureTransition(globalObject->objectPrototype()->structure(*m_jit.vm()));
2241             prototypeChainIsSane = globalObject->stringPrototypeChainIsSane();
2242         }
2243         if (prototypeChainIsSane) {
2244 #if USE(JSVALUE64)
2245             addSlowPathGenerator(std::make_unique<SaneStringGetByValSlowPathGenerator>(
2246                 outOfBounds, this, JSValueRegs(scratchReg), baseReg, propertyReg));
2247 #else
2248             addSlowPathGenerator(std::make_unique<SaneStringGetByValSlowPathGenerator>(
2249                 outOfBounds, this, JSValueRegs(resultTagReg, scratchReg),
2250                 baseReg, propertyReg));
2251 #endif
2252         } else {
2253 #if USE(JSVALUE64)
2254             addSlowPathGenerator(
2255                 slowPathCall(
2256                     outOfBounds, this, operationGetByValStringInt,
2257                     scratchReg, baseReg, propertyReg));
2258 #else
2259             addSlowPathGenerator(
2260                 slowPathCall(
2261                     outOfBounds, this, operationGetByValStringInt,
2262                     JSValueRegs(resultTagReg, scratchReg), baseReg, propertyReg));
2263 #endif
2264         }
2265         
2266 #if USE(JSVALUE64)
2267         jsValueResult(scratchReg, m_currentNode);
2268 #else
2269         jsValueResult(resultTagReg, scratchReg, m_currentNode);
2270 #endif
2271     } else
2272         cellResult(scratchReg, m_currentNode);
2273 }
2274
2275 void SpeculativeJIT::compileFromCharCode(Node* node)
2276 {
2277     Edge& child = node->child1();
2278     if (child.useKind() == UntypedUse) {
2279         JSValueOperand opr(this, child);
2280         JSValueRegs oprRegs = opr.jsValueRegs();
2281
2282         flushRegisters();
2283         JSValueRegsFlushedCallResult result(this);
2284         JSValueRegs resultRegs = result.regs();
2285         callOperation(operationStringFromCharCodeUntyped, resultRegs, oprRegs);
2286         m_jit.exceptionCheck();
2287         
2288         jsValueResult(resultRegs, node);
2289         return;
2290     }
2291
2292     SpeculateStrictInt32Operand property(this, child);
2293     GPRReg propertyReg = property.gpr();
2294     GPRTemporary smallStrings(this);
2295     GPRTemporary scratch(this);
2296     GPRReg scratchReg = scratch.gpr();
2297     GPRReg smallStringsReg = smallStrings.gpr();
2298
2299     JITCompiler::JumpList slowCases;
2300     slowCases.append(m_jit.branch32(MacroAssembler::Above, propertyReg, TrustedImm32(maxSingleCharacterString)));
2301     m_jit.move(TrustedImmPtr(m_jit.vm()->smallStrings.singleCharacterStrings()), smallStringsReg);
2302     m_jit.loadPtr(MacroAssembler::BaseIndex(smallStringsReg, propertyReg, MacroAssembler::ScalePtr, 0), scratchReg);
2303
2304     slowCases.append(m_jit.branchTest32(MacroAssembler::Zero, scratchReg));
2305     addSlowPathGenerator(slowPathCall(slowCases, this, operationStringFromCharCode, scratchReg, propertyReg));
2306     cellResult(scratchReg, m_currentNode);
2307 }
2308
2309 GeneratedOperandType SpeculativeJIT::checkGeneratedTypeForToInt32(Node* node)
2310 {
2311     VirtualRegister virtualRegister = node->virtualRegister();
2312     GenerationInfo& info = generationInfoFromVirtualRegister(virtualRegister);
2313
2314     switch (info.registerFormat()) {
2315     case DataFormatStorage:
2316         RELEASE_ASSERT_NOT_REACHED();
2317
2318     case DataFormatBoolean:
2319     case DataFormatCell:
2320         terminateSpeculativeExecution(Uncountable, JSValueRegs(), 0);
2321         return GeneratedOperandTypeUnknown;
2322
2323     case DataFormatNone:
2324     case DataFormatJSCell:
2325     case DataFormatJS:
2326     case DataFormatJSBoolean:
2327     case DataFormatJSDouble:
2328         return GeneratedOperandJSValue;
2329
2330     case DataFormatJSInt32:
2331     case DataFormatInt32:
2332         return GeneratedOperandInteger;
2333
2334     default:
2335         RELEASE_ASSERT_NOT_REACHED();
2336         return GeneratedOperandTypeUnknown;
2337     }
2338 }
2339
2340 void SpeculativeJIT::compileValueToInt32(Node* node)
2341 {
2342     switch (node->child1().useKind()) {
2343 #if USE(JSVALUE64)
2344     case Int52RepUse: {
2345         SpeculateStrictInt52Operand op1(this, node->child1());
2346         GPRTemporary result(this, Reuse, op1);
2347         GPRReg op1GPR = op1.gpr();
2348         GPRReg resultGPR = result.gpr();
2349         m_jit.zeroExtend32ToPtr(op1GPR, resultGPR);
2350         int32Result(resultGPR, node, DataFormatInt32);
2351         return;
2352     }
2353 #endif // USE(JSVALUE64)
2354         
2355     case DoubleRepUse: {
2356         GPRTemporary result(this);
2357         SpeculateDoubleOperand op1(this, node->child1());
2358         FPRReg fpr = op1.fpr();
2359         GPRReg gpr = result.gpr();
2360 #if CPU(ARM64)
2361         if (MacroAssemblerARM64::supportsDoubleToInt32ConversionUsingJavaScriptSemantics())
2362             m_jit.convertDoubleToInt32UsingJavaScriptSemantics(fpr, gpr);
2363         else
2364 #endif
2365         {
2366             JITCompiler::Jump notTruncatedToInteger = m_jit.branchTruncateDoubleToInt32(fpr, gpr, JITCompiler::BranchIfTruncateFailed);
2367             addSlowPathGenerator(slowPathCall(notTruncatedToInteger, this,
2368                 hasSensibleDoubleToInt() ? operationToInt32SensibleSlow : operationToInt32, NeedToSpill, ExceptionCheckRequirement::CheckNotNeeded, gpr, fpr));
2369         }
2370         int32Result(gpr, node);
2371         return;
2372     }
2373     
2374     case NumberUse:
2375     case NotCellUse: {
2376         switch (checkGeneratedTypeForToInt32(node->child1().node())) {
2377         case GeneratedOperandInteger: {
2378             SpeculateInt32Operand op1(this, node->child1(), ManualOperandSpeculation);
2379             GPRTemporary result(this, Reuse, op1);
2380             m_jit.move(op1.gpr(), result.gpr());
2381             int32Result(result.gpr(), node, op1.format());
2382             return;
2383         }
2384         case GeneratedOperandJSValue: {
2385             GPRTemporary result(this);
2386 #if USE(JSVALUE64)
2387             JSValueOperand op1(this, node->child1(), ManualOperandSpeculation);
2388
2389             GPRReg gpr = op1.gpr();
2390             GPRReg resultGpr = result.gpr();
2391             FPRTemporary tempFpr(this);
2392             FPRReg fpr = tempFpr.fpr();
2393
2394             JITCompiler::Jump isInteger = m_jit.branchIfInt32(gpr);
2395             JITCompiler::JumpList converted;
2396
2397             if (node->child1().useKind() == NumberUse) {
2398                 DFG_TYPE_CHECK(
2399                     JSValueRegs(gpr), node->child1(), SpecBytecodeNumber,
2400                     m_jit.branchIfNotNumber(gpr));
2401             } else {
2402                 JITCompiler::Jump isNumber = m_jit.branchIfNumber(gpr);
2403                 
2404                 DFG_TYPE_CHECK(
2405                     JSValueRegs(gpr), node->child1(), ~SpecCellCheck, m_jit.branchIfCell(JSValueRegs(gpr)));
2406                 
2407                 // It's not a cell: so true turns into 1 and all else turns into 0.
2408                 m_jit.compare64(JITCompiler::Equal, gpr, TrustedImm32(ValueTrue), resultGpr);
2409                 converted.append(m_jit.jump());
2410                 
2411                 isNumber.link(&m_jit);
2412             }
2413
2414             // First, if we get here we have a double encoded as a JSValue
2415             unboxDouble(gpr, resultGpr, fpr);
2416 #if CPU(ARM64)
2417             if (MacroAssemblerARM64::supportsDoubleToInt32ConversionUsingJavaScriptSemantics())
2418                 m_jit.convertDoubleToInt32UsingJavaScriptSemantics(fpr, resultGpr);
2419             else
2420 #endif
2421             {
2422                 silentSpillAllRegisters(resultGpr);
2423                 callOperation(operationToInt32, resultGpr, fpr);
2424                 silentFillAllRegisters();
2425             }
2426
2427             converted.append(m_jit.jump());
2428
2429             isInteger.link(&m_jit);
2430             m_jit.zeroExtend32ToPtr(gpr, resultGpr);
2431
2432             converted.link(&m_jit);
2433 #else
2434             Node* childNode = node->child1().node();
2435             VirtualRegister virtualRegister = childNode->virtualRegister();
2436             GenerationInfo& info = generationInfoFromVirtualRegister(virtualRegister);
2437
2438             JSValueOperand op1(this, node->child1(), ManualOperandSpeculation);
2439
2440             GPRReg payloadGPR = op1.payloadGPR();
2441             GPRReg resultGpr = result.gpr();
2442         
2443             JITCompiler::JumpList converted;
2444
2445             if (info.registerFormat() == DataFormatJSInt32)
2446                 m_jit.move(payloadGPR, resultGpr);
2447             else {
2448                 GPRReg tagGPR = op1.tagGPR();
2449                 FPRTemporary tempFpr(this);
2450                 FPRReg fpr = tempFpr.fpr();
2451                 FPRTemporary scratch(this);
2452
2453                 JITCompiler::Jump isInteger = m_jit.branchIfInt32(tagGPR);
2454
2455                 if (node->child1().useKind() == NumberUse) {
2456                     DFG_TYPE_CHECK(
2457                         op1.jsValueRegs(), node->child1(), SpecBytecodeNumber,
2458                         m_jit.branch32(
2459                             MacroAssembler::AboveOrEqual, tagGPR,
2460                             TrustedImm32(JSValue::LowestTag)));
2461                 } else {
2462                     JITCompiler::Jump isNumber = m_jit.branch32(MacroAssembler::Below, tagGPR, TrustedImm32(JSValue::LowestTag));
2463                     
2464                     DFG_TYPE_CHECK(
2465                         op1.jsValueRegs(), node->child1(), ~SpecCell,
2466                         m_jit.branchIfCell(op1.jsValueRegs()));
2467                     
2468                     // It's not a cell: so true turns into 1 and all else turns into 0.
2469                     JITCompiler::Jump isBoolean = m_jit.branchIfBoolean(tagGPR, InvalidGPRReg);
2470                     m_jit.move(TrustedImm32(0), resultGpr);
2471                     converted.append(m_jit.jump());
2472                     
2473                     isBoolean.link(&m_jit);
2474                     m_jit.move(payloadGPR, resultGpr);
2475                     converted.append(m_jit.jump());
2476                     
2477                     isNumber.link(&m_jit);
2478                 }
2479
2480                 unboxDouble(tagGPR, payloadGPR, fpr, scratch.fpr());
2481
2482                 silentSpillAllRegisters(resultGpr);
2483                 callOperation(operationToInt32, resultGpr, fpr);
2484                 silentFillAllRegisters();
2485
2486                 converted.append(m_jit.jump());
2487
2488                 isInteger.link(&m_jit);
2489                 m_jit.move(payloadGPR, resultGpr);
2490
2491                 converted.link(&m_jit);
2492             }
2493 #endif
2494             int32Result(resultGpr, node);
2495             return;
2496         }
2497         case GeneratedOperandTypeUnknown:
2498             RELEASE_ASSERT(!m_compileOkay);
2499             return;
2500         }
2501         RELEASE_ASSERT_NOT_REACHED();
2502         return;
2503     }
2504     
2505     default:
2506         ASSERT(!m_compileOkay);
2507         return;
2508     }
2509 }
2510
2511 void SpeculativeJIT::compileUInt32ToNumber(Node* node)
2512 {
2513     if (doesOverflow(node->arithMode())) {
2514         if (enableInt52()) {
2515             SpeculateInt32Operand op1(this, node->child1());
2516             GPRTemporary result(this, Reuse, op1);
2517             m_jit.zeroExtend32ToPtr(op1.gpr(), result.gpr());
2518             strictInt52Result(result.gpr(), node);
2519             return;
2520         }
2521         SpeculateInt32Operand op1(this, node->child1());
2522         FPRTemporary result(this);
2523             
2524         GPRReg inputGPR = op1.gpr();
2525         FPRReg outputFPR = result.fpr();
2526             
2527         m_jit.convertInt32ToDouble(inputGPR, outputFPR);
2528             
2529         JITCompiler::Jump positive = m_jit.branch32(MacroAssembler::GreaterThanOrEqual, inputGPR, TrustedImm32(0));
2530         m_jit.addDouble(JITCompiler::AbsoluteAddress(&AssemblyHelpers::twoToThe32), outputFPR);
2531         positive.link(&m_jit);
2532             
2533         doubleResult(outputFPR, node);
2534         return;
2535     }
2536     
2537     RELEASE_ASSERT(node->arithMode() == Arith::CheckOverflow);
2538
2539     SpeculateInt32Operand op1(this, node->child1());
2540     GPRTemporary result(this);
2541
2542     m_jit.move(op1.gpr(), result.gpr());
2543
2544     speculationCheck(Overflow, JSValueRegs(), 0, m_jit.branch32(MacroAssembler::LessThan, result.gpr(), TrustedImm32(0)));
2545
2546     int32Result(result.gpr(), node, op1.format());
2547 }
2548
2549 void SpeculativeJIT::compileDoubleAsInt32(Node* node)
2550 {
2551     SpeculateDoubleOperand op1(this, node->child1());
2552     FPRTemporary scratch(this);
2553     GPRTemporary result(this);
2554     
2555     FPRReg valueFPR = op1.fpr();
2556     FPRReg scratchFPR = scratch.fpr();
2557     GPRReg resultGPR = result.gpr();
2558
2559     JITCompiler::JumpList failureCases;
2560     RELEASE_ASSERT(shouldCheckOverflow(node->arithMode()));
2561     m_jit.branchConvertDoubleToInt32(
2562         valueFPR, resultGPR, failureCases, scratchFPR,
2563         shouldCheckNegativeZero(node->arithMode()));
2564     speculationCheck(Overflow, JSValueRegs(), 0, failureCases);
2565
2566     int32Result(resultGPR, node);
2567 }
2568
2569 void SpeculativeJIT::compileDoubleRep(Node* node)
2570 {
2571     switch (node->child1().useKind()) {
2572     case RealNumberUse: {
2573         JSValueOperand op1(this, node->child1(), ManualOperandSpeculation);
2574         FPRTemporary result(this);
2575         
2576         JSValueRegs op1Regs = op1.jsValueRegs();
2577         FPRReg resultFPR = result.fpr();
2578         
2579 #if USE(JSVALUE64)
2580         GPRTemporary temp(this);
2581         GPRReg tempGPR = temp.gpr();
2582         m_jit.unboxDoubleWithoutAssertions(op1Regs.gpr(), tempGPR, resultFPR);
2583 #else
2584         FPRTemporary temp(this);
2585         FPRReg tempFPR = temp.fpr();
2586         unboxDouble(op1Regs.tagGPR(), op1Regs.payloadGPR(), resultFPR, tempFPR);
2587 #endif
2588         
2589         JITCompiler::Jump done = m_jit.branchIfNotNaN(resultFPR);
2590         
2591         DFG_TYPE_CHECK(
2592             op1Regs, node->child1(), SpecBytecodeRealNumber, m_jit.branchIfNotInt32(op1Regs));
2593         m_jit.convertInt32ToDouble(op1Regs.payloadGPR(), resultFPR);
2594         
2595         done.link(&m_jit);
2596         
2597         doubleResult(resultFPR, node);
2598         return;
2599     }
2600     
2601     case NotCellUse:
2602     case NumberUse: {
2603         SpeculatedType possibleTypes = m_state.forNode(node->child1()).m_type;
2604         if (isInt32Speculation(possibleTypes)) {
2605             SpeculateInt32Operand op1(this, node->child1(), ManualOperandSpeculation);
2606             FPRTemporary result(this);
2607             m_jit.convertInt32ToDouble(op1.gpr(), result.fpr());
2608             doubleResult(result.fpr(), node);
2609             return;
2610         }
2611
2612         JSValueOperand op1(this, node->child1(), ManualOperandSpeculation);
2613         FPRTemporary result(this);
2614
2615 #if USE(JSVALUE64)
2616         GPRTemporary temp(this);
2617
2618         GPRReg op1GPR = op1.gpr();
2619         GPRReg tempGPR = temp.gpr();
2620         FPRReg resultFPR = result.fpr();
2621         JITCompiler::JumpList done;
2622
2623         JITCompiler::Jump isInteger = m_jit.branchIfInt32(op1GPR);
2624
2625         if (node->child1().useKind() == NotCellUse) {
2626             JITCompiler::Jump isNumber = m_jit.branchIfNumber(op1GPR);
2627             JITCompiler::Jump isUndefined = m_jit.branchIfUndefined(op1GPR);
2628
2629             static const double zero = 0;
2630             m_jit.loadDouble(TrustedImmPtr(&zero), resultFPR);
2631
2632             JITCompiler::Jump isNull = m_jit.branchIfNull(op1GPR);
2633             done.append(isNull);
2634
2635             DFG_TYPE_CHECK(JSValueRegs(op1GPR), node->child1(), ~SpecCellCheck,
2636                 m_jit.branchTest64(JITCompiler::Zero, op1GPR, TrustedImm32(static_cast<int32_t>(TagBitBool))));
2637
2638             JITCompiler::Jump isFalse = m_jit.branch64(JITCompiler::Equal, op1GPR, TrustedImm64(ValueFalse));
2639             static const double one = 1;
2640             m_jit.loadDouble(TrustedImmPtr(&one), resultFPR);
2641             done.append(m_jit.jump());
2642             done.append(isFalse);
2643
2644             isUndefined.link(&m_jit);
2645             static const double NaN = PNaN;
2646             m_jit.loadDouble(TrustedImmPtr(&NaN), resultFPR);
2647             done.append(m_jit.jump());
2648
2649             isNumber.link(&m_jit);
2650         } else if (needsTypeCheck(node->child1(), SpecBytecodeNumber)) {
2651             typeCheck(
2652                 JSValueRegs(op1GPR), node->child1(), SpecBytecodeNumber,
2653                 m_jit.branchIfNotNumber(op1GPR));
2654         }
2655
2656         unboxDouble(op1GPR, tempGPR, resultFPR);
2657         done.append(m_jit.jump());
2658     
2659         isInteger.link(&m_jit);
2660         m_jit.convertInt32ToDouble(op1GPR, resultFPR);
2661         done.link(&m_jit);
2662 #else // USE(JSVALUE64) -> this is the 32_64 case
2663         FPRTemporary temp(this);
2664     
2665         GPRReg op1TagGPR = op1.tagGPR();
2666         GPRReg op1PayloadGPR = op1.payloadGPR();
2667         FPRReg tempFPR = temp.fpr();
2668         FPRReg resultFPR = result.fpr();
2669         JITCompiler::JumpList done;
2670     
2671         JITCompiler::Jump isInteger = m_jit.branchIfInt32(op1TagGPR);
2672
2673         if (node->child1().useKind() == NotCellUse) {
2674             JITCompiler::Jump isNumber = m_jit.branch32(JITCompiler::Below, op1TagGPR, JITCompiler::TrustedImm32(JSValue::LowestTag + 1));
2675             JITCompiler::Jump isUndefined = m_jit.branchIfUndefined(op1TagGPR);
2676
2677             static const double zero = 0;
2678             m_jit.loadDouble(TrustedImmPtr(&zero), resultFPR);
2679
2680             JITCompiler::Jump isNull = m_jit.branchIfNull(op1TagGPR);
2681             done.append(isNull);
2682
2683             DFG_TYPE_CHECK(JSValueRegs(op1TagGPR, op1PayloadGPR), node->child1(), ~SpecCell, m_jit.branchIfNotBoolean(op1TagGPR, InvalidGPRReg));
2684
2685             JITCompiler::Jump isFalse = m_jit.branchTest32(JITCompiler::Zero, op1PayloadGPR, TrustedImm32(1));
2686             static const double one = 1;
2687             m_jit.loadDouble(TrustedImmPtr(&one), resultFPR);
2688             done.append(m_jit.jump());
2689             done.append(isFalse);
2690
2691             isUndefined.link(&m_jit);
2692             static const double NaN = PNaN;
2693             m_jit.loadDouble(TrustedImmPtr(&NaN), resultFPR);
2694             done.append(m_jit.jump());
2695
2696             isNumber.link(&m_jit);
2697         } else if (needsTypeCheck(node->child1(), SpecBytecodeNumber)) {
2698             // This check fails with Int32Tag, but it is OK since Int32 case is already excluded.
2699             typeCheck(
2700                 JSValueRegs(op1TagGPR, op1PayloadGPR), node->child1(), SpecBytecodeNumber,
2701                 m_jit.branch32(MacroAssembler::AboveOrEqual, op1TagGPR, TrustedImm32(JSValue::LowestTag)));
2702         }
2703
2704         unboxDouble(op1TagGPR, op1PayloadGPR, resultFPR, tempFPR);
2705         done.append(m_jit.jump());
2706     
2707         isInteger.link(&m_jit);
2708         m_jit.convertInt32ToDouble(op1PayloadGPR, resultFPR);
2709         done.link(&m_jit);
2710 #endif // USE(JSVALUE64)
2711     
2712         doubleResult(resultFPR, node);
2713         return;
2714     }
2715         
2716 #if USE(JSVALUE64)
2717     case Int52RepUse: {
2718         SpeculateStrictInt52Operand value(this, node->child1());
2719         FPRTemporary result(this);
2720         
2721         GPRReg valueGPR = value.gpr();
2722         FPRReg resultFPR = result.fpr();
2723
2724         m_jit.convertInt64ToDouble(valueGPR, resultFPR);
2725         
2726         doubleResult(resultFPR, node);
2727         return;
2728     }
2729 #endif // USE(JSVALUE64)
2730         
2731     default:
2732         RELEASE_ASSERT_NOT_REACHED();
2733         return;
2734     }
2735 }
2736
2737 void SpeculativeJIT::compileValueRep(Node* node)
2738 {
2739     switch (node->child1().useKind()) {
2740     case DoubleRepUse: {
2741         SpeculateDoubleOperand value(this, node->child1());
2742         JSValueRegsTemporary result(this);
2743         
2744         FPRReg valueFPR = value.fpr();
2745         JSValueRegs resultRegs = result.regs();
2746         
2747         // It's very tempting to in-place filter the value to indicate that it's not impure NaN
2748         // anymore. Unfortunately, this would be unsound. If it's a GetLocal or if the value was
2749         // subject to a prior SetLocal, filtering the value would imply that the corresponding
2750         // local was purified.
2751         if (needsTypeCheck(node->child1(), ~SpecDoubleImpureNaN))
2752             m_jit.purifyNaN(valueFPR);
2753
2754         boxDouble(valueFPR, resultRegs);
2755         
2756         jsValueResult(resultRegs, node);
2757         return;
2758     }
2759         
2760 #if USE(JSVALUE64)
2761     case Int52RepUse: {
2762         SpeculateStrictInt52Operand value(this, node->child1());
2763         GPRTemporary result(this);
2764         
2765         GPRReg valueGPR = value.gpr();
2766         GPRReg resultGPR = result.gpr();
2767         
2768         boxInt52(valueGPR, resultGPR, DataFormatStrictInt52);
2769         
2770         jsValueResult(resultGPR, node);
2771         return;
2772     }
2773 #endif // USE(JSVALUE64)
2774         
2775     default:
2776         RELEASE_ASSERT_NOT_REACHED();
2777         return;
2778     }
2779 }
2780
2781 static double clampDoubleToByte(double d)
2782 {
2783     d += 0.5;
2784     if (!(d > 0))
2785         d = 0;
2786     else if (d > 255)
2787         d = 255;
2788     return d;
2789 }
2790
2791 static void compileClampIntegerToByte(JITCompiler& jit, GPRReg result)
2792 {
2793     MacroAssembler::Jump inBounds = jit.branch32(MacroAssembler::BelowOrEqual, result, JITCompiler::TrustedImm32(0xff));
2794     MacroAssembler::Jump tooBig = jit.branch32(MacroAssembler::GreaterThan, result, JITCompiler::TrustedImm32(0xff));
2795     jit.xorPtr(result, result);
2796     MacroAssembler::Jump clamped = jit.jump();
2797     tooBig.link(&jit);
2798     jit.move(JITCompiler::TrustedImm32(255), result);
2799     clamped.link(&jit);
2800     inBounds.link(&jit);
2801 }
2802
2803 static void compileClampDoubleToByte(JITCompiler& jit, GPRReg result, FPRReg source, FPRReg scratch)
2804 {
2805     // Unordered compare so we pick up NaN
2806     static const double zero = 0;
2807     static const double byteMax = 255;
2808     static const double half = 0.5;
2809     jit.loadDouble(JITCompiler::TrustedImmPtr(&zero), scratch);
2810     MacroAssembler::Jump tooSmall = jit.branchDouble(MacroAssembler::DoubleLessThanOrEqualOrUnordered, source, scratch);
2811     jit.loadDouble(JITCompiler::TrustedImmPtr(&byteMax), scratch);
2812     MacroAssembler::Jump tooBig = jit.branchDouble(MacroAssembler::DoubleGreaterThan, source, scratch);
2813     
2814     jit.loadDouble(JITCompiler::TrustedImmPtr(&half), scratch);
2815     // FIXME: This should probably just use a floating point round!
2816     // https://bugs.webkit.org/show_bug.cgi?id=72054
2817     jit.addDouble(source, scratch);
2818     jit.truncateDoubleToInt32(scratch, result);   
2819     MacroAssembler::Jump truncatedInt = jit.jump();
2820     
2821     tooSmall.link(&jit);
2822     jit.xorPtr(result, result);
2823     MacroAssembler::Jump zeroed = jit.jump();
2824     
2825     tooBig.link(&jit);
2826     jit.move(JITCompiler::TrustedImm32(255), result);
2827     
2828     truncatedInt.link(&jit);
2829     zeroed.link(&jit);
2830
2831 }
2832
2833 JITCompiler::Jump SpeculativeJIT::jumpForTypedArrayOutOfBounds(Node* node, GPRReg baseGPR, GPRReg indexGPR)
2834 {
2835     if (node->op() == PutByValAlias)
2836         return JITCompiler::Jump();
2837     JSArrayBufferView* view = m_jit.graph().tryGetFoldableView(
2838         m_state.forNode(m_jit.graph().child(node, 0)).m_value, node->arrayMode());
2839     if (view) {
2840         uint32_t length = view->length();
2841         Node* indexNode = m_jit.graph().child(node, 1).node();
2842         if (indexNode->isInt32Constant() && indexNode->asUInt32() < length)
2843             return JITCompiler::Jump();
2844         return m_jit.branch32(
2845             MacroAssembler::AboveOrEqual, indexGPR, MacroAssembler::Imm32(length));
2846     }
2847     return m_jit.branch32(
2848         MacroAssembler::AboveOrEqual, indexGPR,
2849         MacroAssembler::Address(baseGPR, JSArrayBufferView::offsetOfLength()));
2850 }
2851
2852 void SpeculativeJIT::emitTypedArrayBoundsCheck(Node* node, GPRReg baseGPR, GPRReg indexGPR)
2853 {
2854     JITCompiler::Jump jump = jumpForTypedArrayOutOfBounds(node, baseGPR, indexGPR);
2855     if (!jump.isSet())
2856         return;
2857     speculationCheck(OutOfBounds, JSValueRegs(), 0, jump);
2858 }
2859
2860 JITCompiler::Jump SpeculativeJIT::jumpForTypedArrayIsNeuteredIfOutOfBounds(Node* node, GPRReg base, JITCompiler::Jump outOfBounds)
2861 {
2862     JITCompiler::Jump done;
2863     if (outOfBounds.isSet()) {
2864         done = m_jit.jump();
2865         if (node->arrayMode().isInBounds())
2866             speculationCheck(OutOfBounds, JSValueSource(), 0, outOfBounds);
2867         else {
2868             outOfBounds.link(&m_jit);
2869
2870             JITCompiler::Jump notWasteful = m_jit.branch32(
2871                 MacroAssembler::NotEqual,
2872                 MacroAssembler::Address(base, JSArrayBufferView::offsetOfMode()),
2873                 TrustedImm32(WastefulTypedArray));
2874
2875             JITCompiler::Jump hasNullVector = m_jit.branchTestPtr(
2876                 MacroAssembler::Zero,
2877                 MacroAssembler::Address(base, JSArrayBufferView::offsetOfVector()));
2878             speculationCheck(Uncountable, JSValueSource(), node, hasNullVector);
2879             notWasteful.link(&m_jit);
2880         }
2881     }
2882     return done;
2883 }
2884
2885 void SpeculativeJIT::loadFromIntTypedArray(GPRReg storageReg, GPRReg propertyReg, GPRReg resultReg, TypedArrayType type)
2886 {
2887     switch (elementSize(type)) {
2888     case 1:
2889         if (isSigned(type))
2890             m_jit.load8SignedExtendTo32(MacroAssembler::BaseIndex(storageReg, propertyReg, MacroAssembler::TimesOne), resultReg);
2891         else
2892             m_jit.load8(MacroAssembler::BaseIndex(storageReg, propertyReg, MacroAssembler::TimesOne), resultReg);
2893         break;
2894     case 2:
2895         if (isSigned(type))
2896             m_jit.load16SignedExtendTo32(MacroAssembler::BaseIndex(storageReg, propertyReg, MacroAssembler::TimesTwo), resultReg);
2897         else
2898             m_jit.load16(MacroAssembler::BaseIndex(storageReg, propertyReg, MacroAssembler::TimesTwo), resultReg);
2899         break;
2900     case 4:
2901         m_jit.load32(MacroAssembler::BaseIndex(storageReg, propertyReg, MacroAssembler::TimesFour), resultReg);
2902         break;
2903     default:
2904         CRASH();
2905     }
2906 }
2907
2908 void SpeculativeJIT::setIntTypedArrayLoadResult(Node* node, GPRReg resultReg, TypedArrayType type, bool canSpeculate)
2909 {
2910     if (elementSize(type) < 4 || isSigned(type)) {
2911         int32Result(resultReg, node);
2912         return;
2913     }
2914     
2915     ASSERT(elementSize(type) == 4 && !isSigned(type));
2916     if (node->shouldSpeculateInt32() && canSpeculate) {
2917         speculationCheck(Overflow, JSValueRegs(), 0, m_jit.branch32(MacroAssembler::LessThan, resultReg, TrustedImm32(0)));
2918         int32Result(resultReg, node);
2919         return;
2920     }
2921     
2922 #if USE(JSVALUE64)
2923     if (node->shouldSpeculateAnyInt()) {
2924         m_jit.zeroExtend32ToPtr(resultReg, resultReg);
2925         strictInt52Result(resultReg, node);
2926         return;
2927     }
2928 #endif
2929     
2930     FPRTemporary fresult(this);
2931     m_jit.convertInt32ToDouble(resultReg, fresult.fpr());
2932     JITCompiler::Jump positive = m_jit.branch32(MacroAssembler::GreaterThanOrEqual, resultReg, TrustedImm32(0));
2933     m_jit.addDouble(JITCompiler::AbsoluteAddress(&AssemblyHelpers::twoToThe32), fresult.fpr());
2934     positive.link(&m_jit);
2935     doubleResult(fresult.fpr(), node);
2936 }
2937
2938 void SpeculativeJIT::compileGetByValOnIntTypedArray(Node* node, TypedArrayType type)
2939 {
2940     ASSERT(isInt(type));
2941     
2942     SpeculateCellOperand base(this, m_graph.varArgChild(node, 0));
2943     SpeculateStrictInt32Operand property(this, m_graph.varArgChild(node, 1));
2944     StorageOperand storage(this, m_graph.varArgChild(node, 2));
2945
2946     GPRReg baseReg = base.gpr();
2947     GPRReg propertyReg = property.gpr();
2948     GPRReg storageReg = storage.gpr();
2949
2950     GPRTemporary result(this);
2951     GPRReg resultReg = result.gpr();
2952
2953     ASSERT(node->arrayMode().alreadyChecked(m_jit.graph(), node, m_state.forNode(m_graph.varArgChild(node, 0))));
2954
2955     emitTypedArrayBoundsCheck(node, baseReg, propertyReg);
2956     loadFromIntTypedArray(storageReg, propertyReg, resultReg, type);
2957     bool canSpeculate = true;
2958     setIntTypedArrayLoadResult(node, resultReg, type, canSpeculate);
2959 }
2960
2961 bool SpeculativeJIT::getIntTypedArrayStoreOperand(
2962     GPRTemporary& value,
2963     GPRReg property,
2964 #if USE(JSVALUE32_64)
2965     GPRTemporary& propertyTag,
2966     GPRTemporary& valueTag,
2967 #endif
2968     Edge valueUse, JITCompiler::JumpList& slowPathCases, bool isClamped)
2969 {
2970     bool isAppropriateConstant = false;
2971     if (valueUse->isConstant()) {
2972         JSValue jsValue = valueUse->asJSValue();
2973         SpeculatedType expectedType = typeFilterFor(valueUse.useKind());
2974         SpeculatedType actualType = speculationFromValue(jsValue);
2975         isAppropriateConstant = (expectedType | actualType) == expectedType;
2976     }
2977     
2978     if (isAppropriateConstant) {
2979         JSValue jsValue = valueUse->asJSValue();
2980         if (!jsValue.isNumber()) {
2981             terminateSpeculativeExecution(Uncountable, JSValueRegs(), 0);
2982             return false;
2983         }
2984         double d = jsValue.asNumber();
2985         if (isClamped)
2986             d = clampDoubleToByte(d);
2987         GPRTemporary scratch(this);
2988         GPRReg scratchReg = scratch.gpr();
2989         m_jit.move(Imm32(toInt32(d)), scratchReg);
2990         value.adopt(scratch);
2991     } else {
2992         switch (valueUse.useKind()) {
2993         case Int32Use: {
2994             SpeculateInt32Operand valueOp(this, valueUse);
2995             GPRTemporary scratch(this);
2996             GPRReg scratchReg = scratch.gpr();
2997             m_jit.move(valueOp.gpr(), scratchReg);
2998             if (isClamped)
2999                 compileClampIntegerToByte(m_jit, scratchReg);
3000             value.adopt(scratch);
3001             break;
3002         }
3003             
3004 #if USE(JSVALUE64)
3005         case Int52RepUse: {
3006             SpeculateStrictInt52Operand valueOp(this, valueUse);
3007             GPRTemporary scratch(this);
3008             GPRReg scratchReg = scratch.gpr();
3009             m_jit.move(valueOp.gpr(), scratchReg);
3010             if (isClamped) {
3011                 MacroAssembler::Jump inBounds = m_jit.branch64(
3012                     MacroAssembler::BelowOrEqual, scratchReg, JITCompiler::TrustedImm64(0xff));
3013                 MacroAssembler::Jump tooBig = m_jit.branch64(
3014                     MacroAssembler::GreaterThan, scratchReg, JITCompiler::TrustedImm64(0xff));
3015                 m_jit.move(TrustedImm32(0), scratchReg);
3016                 MacroAssembler::Jump clamped = m_jit.jump();
3017                 tooBig.link(&m_jit);
3018                 m_jit.move(JITCompiler::TrustedImm32(255), scratchReg);
3019                 clamped.link(&m_jit);
3020                 inBounds.link(&m_jit);
3021             }
3022             value.adopt(scratch);
3023             break;
3024         }
3025 #endif // USE(JSVALUE64)
3026             
3027         case DoubleRepUse: {
3028             RELEASE_ASSERT(!isAtomicsIntrinsic(m_currentNode->op()));
3029             if (isClamped) {
3030                 SpeculateDoubleOperand valueOp(this, valueUse);
3031                 GPRTemporary result(this);
3032                 FPRTemporary floatScratch(this);
3033                 FPRReg fpr = valueOp.fpr();
3034                 GPRReg gpr = result.gpr();
3035                 compileClampDoubleToByte(m_jit, gpr, fpr, floatScratch.fpr());
3036                 value.adopt(result);
3037             } else {
3038 #if USE(JSVALUE32_64)
3039                 GPRTemporary realPropertyTag(this);
3040                 propertyTag.adopt(realPropertyTag);
3041                 GPRReg propertyTagGPR = propertyTag.gpr();
3042
3043                 GPRTemporary realValueTag(this);
3044                 valueTag.adopt(realValueTag);
3045                 GPRReg valueTagGPR = valueTag.gpr();
3046 #endif
3047                 SpeculateDoubleOperand valueOp(this, valueUse);
3048                 GPRTemporary result(this);
3049                 FPRReg fpr = valueOp.fpr();
3050                 GPRReg gpr = result.gpr();
3051                 MacroAssembler::Jump notNaN = m_jit.branchIfNotNaN(fpr);
3052                 m_jit.xorPtr(gpr, gpr);
3053                 MacroAssembler::JumpList fixed(m_jit.jump());
3054                 notNaN.link(&m_jit);
3055
3056                 fixed.append(m_jit.branchTruncateDoubleToInt32(
3057                     fpr, gpr, MacroAssembler::BranchIfTruncateSuccessful));
3058
3059 #if USE(JSVALUE64)
3060                 m_jit.or64(GPRInfo::tagTypeNumberRegister, property);
3061                 boxDouble(fpr, gpr);
3062 #else
3063                 UNUSED_PARAM(property);
3064                 m_jit.move(TrustedImm32(JSValue::Int32Tag), propertyTagGPR);
3065                 boxDouble(fpr, valueTagGPR, gpr);
3066 #endif
3067                 slowPathCases.append(m_jit.jump());
3068
3069                 fixed.link(&m_jit);
3070                 value.adopt(result);
3071             }
3072             break;
3073         }
3074             
3075         default:
3076             RELEASE_ASSERT_NOT_REACHED();
3077             break;
3078         }
3079     }
3080     return true;
3081 }
3082
3083 void SpeculativeJIT::compilePutByValForIntTypedArray(GPRReg base, GPRReg property, Node* node, TypedArrayType type)
3084 {
3085     ASSERT(isInt(type));
3086     
3087     StorageOperand storage(this, m_jit.graph().varArgChild(node, 3));
3088     GPRReg storageReg = storage.gpr();
3089     
3090     Edge valueUse = m_jit.graph().varArgChild(node, 2);
3091     
3092     GPRTemporary value;
3093 #if USE(JSVALUE32_64)
3094     GPRTemporary propertyTag;
3095     GPRTemporary valueTag;
3096 #endif
3097
3098     JITCompiler::JumpList slowPathCases;
3099     
3100     bool result = getIntTypedArrayStoreOperand(
3101         value, property,
3102 #if USE(JSVALUE32_64)
3103         propertyTag, valueTag,
3104 #endif
3105         valueUse, slowPathCases, isClamped(type));
3106     if (!result) {
3107         noResult(node);
3108         return;
3109     }
3110
3111     GPRReg valueGPR = value.gpr();
3112 #if USE(JSVALUE32_64)
3113     GPRReg propertyTagGPR = propertyTag.gpr();
3114     GPRReg valueTagGPR = valueTag.gpr();
3115 #endif
3116
3117     ASSERT_UNUSED(valueGPR, valueGPR != property);
3118     ASSERT(valueGPR != base);
3119     ASSERT(valueGPR != storageReg);
3120     JITCompiler::Jump outOfBounds = jumpForTypedArrayOutOfBounds(node, base, property);
3121
3122     switch (elementSize(type)) {
3123     case 1:
3124         m_jit.store8(value.gpr(), MacroAssembler::BaseIndex(storageReg, property, MacroAssembler::TimesOne));
3125         break;
3126     case 2:
3127         m_jit.store16(value.gpr(), MacroAssembler::BaseIndex(storageReg, property, MacroAssembler::TimesTwo));
3128         break;
3129     case 4:
3130         m_jit.store32(value.gpr(), MacroAssembler::BaseIndex(storageReg, property, MacroAssembler::TimesFour));
3131         break;
3132     default:
3133         CRASH();
3134     }
3135
3136     JITCompiler::Jump done = jumpForTypedArrayIsNeuteredIfOutOfBounds(node, base, outOfBounds);
3137     if (done.isSet())
3138         done.link(&m_jit);
3139
3140     if (!slowPathCases.empty()) {
3141 #if USE(JSVALUE64)
3142         if (node->op() == PutByValDirect) {
3143             addSlowPathGenerator(slowPathCall(
3144                 slowPathCases, this,
3145                 m_jit.isStrictModeFor(node->origin.semantic) ? operationPutByValDirectStrict : operationPutByValDirectNonStrict,
3146                 NoResult, base, property, valueGPR));
3147         } else {
3148             addSlowPathGenerator(slowPathCall(
3149                 slowPathCases, this,
3150                 m_jit.isStrictModeFor(node->origin.semantic) ? operationPutByValStrict : operationPutByValNonStrict,
3151                 NoResult, base, property, valueGPR));
3152         }
3153 #else // not USE(JSVALUE64)
3154         if (node->op() == PutByValDirect) {
3155             addSlowPathGenerator(slowPathCall(
3156                 slowPathCases, this,
3157                 m_jit.codeBlock()->isStrictMode() ? operationPutByValDirectCellStrict : operationPutByValDirectCellNonStrict,
3158                 NoResult, base, JSValueRegs(propertyTagGPR, property), JSValueRegs(valueTagGPR, valueGPR)));
3159         } else {
3160             addSlowPathGenerator(slowPathCall(
3161                 slowPathCases, this,
3162                 m_jit.codeBlock()->isStrictMode() ? operationPutByValCellStrict : operationPutByValCellNonStrict,
3163                 NoResult, base, JSValueRegs(propertyTagGPR, property), JSValueRegs(valueTagGPR, valueGPR)));
3164         }
3165 #endif
3166     }
3167     
3168     noResult(node);
3169 }
3170
3171 void SpeculativeJIT::compileGetByValOnFloatTypedArray(Node* node, TypedArrayType type)
3172 {
3173     ASSERT(isFloat(type));
3174     
3175     SpeculateCellOperand base(this, m_graph.varArgChild(node, 0));
3176     SpeculateStrictInt32Operand property(this, m_graph.varArgChild(node, 1));
3177     StorageOperand storage(this, m_graph.varArgChild(node, 2));
3178
3179     GPRReg baseReg = base.gpr();
3180     GPRReg propertyReg = property.gpr();
3181     GPRReg storageReg = storage.gpr();
3182
3183     ASSERT(node->arrayMode().alreadyChecked(m_jit.graph(), node, m_state.forNode(m_graph.varArgChild(node, 0))));
3184
3185     FPRTemporary result(this);
3186     FPRReg resultReg = result.fpr();
3187     emitTypedArrayBoundsCheck(node, baseReg, propertyReg);
3188     switch (elementSize(type)) {
3189     case 4:
3190         m_jit.loadFloat(MacroAssembler::BaseIndex(storageReg, propertyReg, MacroAssembler::TimesFour), resultReg);
3191         m_jit.convertFloatToDouble(resultReg, resultReg);
3192         break;
3193     case 8: {
3194         m_jit.loadDouble(MacroAssembler::BaseIndex(storageReg, propertyReg, MacroAssembler::TimesEight), resultReg);
3195         break;
3196     }
3197     default:
3198         RELEASE_ASSERT_NOT_REACHED();
3199     }
3200     
3201     doubleResult(resultReg, node);
3202 }
3203
3204 void SpeculativeJIT::compilePutByValForFloatTypedArray(GPRReg base, GPRReg property, Node* node, TypedArrayType type)
3205 {
3206     ASSERT(isFloat(type));
3207     
3208     StorageOperand storage(this, m_jit.graph().varArgChild(node, 3));
3209     GPRReg storageReg = storage.gpr();
3210     
3211     Edge baseUse = m_jit.graph().varArgChild(node, 0);
3212     Edge valueUse = m_jit.graph().varArgChild(node, 2);
3213
3214     SpeculateDoubleOperand valueOp(this, valueUse);
3215     FPRTemporary scratch(this);
3216     FPRReg valueFPR = valueOp.fpr();
3217     FPRReg scratchFPR = scratch.fpr();
3218
3219     ASSERT_UNUSED(baseUse, node->arrayMode().alreadyChecked(m_jit.graph(), node, m_state.forNode(baseUse)));
3220     
3221     MacroAssembler::Jump outOfBounds = jumpForTypedArrayOutOfBounds(node, base, property);
3222     
3223     switch (elementSize(type)) {
3224     case 4: {
3225         m_jit.moveDouble(valueFPR, scratchFPR);
3226         m_jit.convertDoubleToFloat(valueFPR, scratchFPR);
3227         m_jit.storeFloat(scratchFPR, MacroAssembler::BaseIndex(storageReg, property, MacroAssembler::TimesFour));
3228         break;
3229     }
3230     case 8:
3231         m_jit.storeDouble(valueFPR, MacroAssembler::BaseIndex(storageReg, property, MacroAssembler::TimesEight));
3232         break;
3233     default:
3234         RELEASE_ASSERT_NOT_REACHED();
3235     }
3236
3237     JITCompiler::Jump done = jumpForTypedArrayIsNeuteredIfOutOfBounds(node, base, outOfBounds);
3238     if (done.isSet())
3239         done.link(&m_jit);
3240     noResult(node);
3241 }
3242
3243 void SpeculativeJIT::compileGetByValForObjectWithString(Node* node)
3244 {
3245     SpeculateCellOperand arg1(this, m_graph.varArgChild(node, 0));
3246     SpeculateCellOperand arg2(this, m_graph.varArgChild(node, 1));
3247
3248     GPRReg arg1GPR = arg1.gpr();
3249     GPRReg arg2GPR = arg2.gpr();
3250
3251     speculateObject(m_graph.varArgChild(node, 0), arg1GPR);
3252     speculateString(m_graph.varArgChild(node, 1), arg2GPR);
3253
3254     flushRegisters();
3255     JSValueRegsFlushedCallResult result(this);
3256     JSValueRegs resultRegs = result.regs();
3257     callOperation(operationGetByValObjectString, resultRegs, arg1GPR, arg2GPR);
3258     m_jit.exceptionCheck();
3259
3260     jsValueResult(resultRegs, node);
3261 }
3262
3263 void SpeculativeJIT::compileGetByValForObjectWithSymbol(Node* node)
3264 {
3265     SpeculateCellOperand arg1(this, m_graph.varArgChild(node, 0));
3266     SpeculateCellOperand arg2(this, m_graph.varArgChild(node, 1));
3267
3268     GPRReg arg1GPR = arg1.gpr();
3269     GPRReg arg2GPR = arg2.gpr();
3270
3271     speculateObject(m_graph.varArgChild(node, 0), arg1GPR);
3272     speculateSymbol(m_graph.varArgChild(node, 1), arg2GPR);
3273
3274     flushRegisters();
3275     JSValueRegsFlushedCallResult result(this);
3276     JSValueRegs resultRegs = result.regs();
3277     callOperation(operationGetByValObjectSymbol, resultRegs, arg1GPR, arg2GPR);
3278     m_jit.exceptionCheck();
3279
3280     jsValueResult(resultRegs, node);
3281 }
3282
3283 void SpeculativeJIT::compilePutByValForCellWithString(Node* node, Edge& child1, Edge& child2, Edge& child3)
3284 {
3285     SpeculateCellOperand arg1(this, child1);
3286     SpeculateCellOperand arg2(this, child2);
3287     JSValueOperand arg3(this, child3);
3288
3289     GPRReg arg1GPR = arg1.gpr();
3290     GPRReg arg2GPR = arg2.gpr();
3291     JSValueRegs arg3Regs = arg3.jsValueRegs();
3292
3293     speculateString(child2, arg2GPR);
3294
3295     flushRegisters();
3296     callOperation(m_jit.isStrictModeFor(node->origin.semantic) ? operationPutByValCellStringStrict : operationPutByValCellStringNonStrict, arg1GPR, arg2GPR, arg3Regs);
3297     m_jit.exceptionCheck();
3298
3299     noResult(node);
3300 }
3301
3302 void SpeculativeJIT::compilePutByValForCellWithSymbol(Node* node, Edge& child1, Edge& child2, Edge& child3)
3303 {
3304     SpeculateCellOperand arg1(this, child1);
3305     SpeculateCellOperand arg2(this, child2);
3306     JSValueOperand arg3(this, child3);
3307
3308     GPRReg arg1GPR = arg1.gpr();
3309     GPRReg arg2GPR = arg2.gpr();
3310     JSValueRegs arg3Regs = arg3.jsValueRegs();
3311
3312     speculateSymbol(child2, arg2GPR);
3313
3314     flushRegisters();
3315     callOperation(m_jit.isStrictModeFor(node->origin.semantic) ? operationPutByValCellSymbolStrict : operationPutByValCellSymbolNonStrict, arg1GPR, arg2GPR, arg3Regs);
3316     m_jit.exceptionCheck();
3317
3318     noResult(node);
3319 }
3320
3321 void SpeculativeJIT::compileGetByValWithThis(Node* node)
3322 {
3323     JSValueOperand base(this, node->child1());
3324     JSValueRegs baseRegs = base.jsValueRegs();
3325     JSValueOperand thisValue(this, node->child2());
3326     JSValueRegs thisValueRegs = thisValue.jsValueRegs();
3327     JSValueOperand subscript(this, node->child3());
3328     JSValueRegs subscriptRegs = subscript.jsValueRegs();
3329
3330     flushRegisters();
3331     JSValueRegsFlushedCallResult result(this);
3332     JSValueRegs resultRegs = result.regs();
3333     callOperation(operationGetByValWithThis, resultRegs, baseRegs, thisValueRegs, subscriptRegs);
3334     m_jit.exceptionCheck();
3335
3336     jsValueResult(resultRegs, node);
3337 }
3338
3339 void SpeculativeJIT::compileCheckTypeInfoFlags(Node* node)
3340 {
3341     SpeculateCellOperand base(this, node->child1());
3342
3343     GPRReg baseGPR = base.gpr();
3344
3345     // FIXME: This only works for checking if a single bit is set. If we want to check more
3346     // than one bit at once, we'll need to fix this:
3347     // https://bugs.webkit.org/show_bug.cgi?id=185705
3348     speculationCheck(BadTypeInfoFlags, JSValueRegs(), 0, m_jit.branchTest8(MacroAssembler::Zero, MacroAssembler::Address(baseGPR, JSCell::typeInfoFlagsOffset()), MacroAssembler::TrustedImm32(node->typeInfoOperand())));
3349
3350     noResult(node);
3351 }
3352
3353 void SpeculativeJIT::compileParseInt(Node* node)
3354 {
3355     RELEASE_ASSERT(node->child1().useKind() == UntypedUse || node->child1().useKind() == StringUse);
3356     if (node->child2()) {
3357         SpeculateInt32Operand radix(this, node->child2());