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DFGSpeculativeJIT.cpp
16313 lines (13407 loc) · 628 KB
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DFGSpeculativeJIT.cpp
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/*
* Copyright (C) 2011-2021 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "DFGSpeculativeJIT.h"
#if ENABLE(DFG_JIT)
#include "BinarySwitch.h"
#include "DFGAbstractInterpreterInlines.h"
#include "DFGArrayifySlowPathGenerator.h"
#include "DFGCallArrayAllocatorSlowPathGenerator.h"
#include "DFGCallCreateDirectArgumentsSlowPathGenerator.h"
#include "DFGCapabilities.h"
#include "DFGClobberize.h"
#include "DFGMayExit.h"
#include "DFGOSRExitFuzz.h"
#include "DFGSaneStringGetByValSlowPathGenerator.h"
#include "DFGSlowPathGenerator.h"
#include "DFGSnippetParams.h"
#include "DirectArguments.h"
#include "DisallowMacroScratchRegisterUsage.h"
#include "JITBitAndGenerator.h"
#include "JITBitOrGenerator.h"
#include "JITBitXorGenerator.h"
#include "JITDivGenerator.h"
#include "JITLeftShiftGenerator.h"
#include "JITRightShiftGenerator.h"
#include "JITSizeStatistics.h"
#include "JSArrayIterator.h"
#include "JSAsyncFunction.h"
#include "JSAsyncGeneratorFunction.h"
#include "JSBoundFunction.h"
#include "JSCInlines.h"
#include "JSGeneratorFunction.h"
#include "JSImmutableButterfly.h"
#include "JSLexicalEnvironment.h"
#include "JSMapIterator.h"
#include "JSPropertyNameEnumerator.h"
#include "JSSetIterator.h"
#include "LLIntThunks.h"
#include "ProbeContext.h"
#include "RegExpObject.h"
#include "ScopedArguments.h"
#include "TypeProfilerLog.h"
#include "WeakMapImpl.h"
#include <wtf/BitVector.h>
#include <wtf/Box.h>
#include <wtf/MathExtras.h>
namespace JSC { namespace DFG {
DEFINE_ALLOCATOR_WITH_HEAP_IDENTIFIER(SpeculativeJIT);
SpeculativeJIT::SpeculativeJIT(JITCompiler& jit)
: m_jit(jit)
, m_graph(m_jit.graph())
, m_currentNode(nullptr)
, m_lastGeneratedNode(LastNodeType)
, m_indexInBlock(0)
, m_generationInfo(m_graph.frameRegisterCount())
, m_compileOkay(true)
, m_state(m_graph)
, m_interpreter(m_graph, m_state)
, m_minifiedGraph(&jit.jitCode()->minifiedDFG)
{
}
SpeculativeJIT::~SpeculativeJIT()
{
}
void SpeculativeJIT::emitAllocateRawObject(GPRReg resultGPR, RegisteredStructure structure, GPRReg storageGPR, unsigned numElements, unsigned vectorLength)
{
ASSERT(!isCopyOnWrite(structure->indexingMode()));
IndexingType indexingType = structure->indexingType();
bool hasIndexingHeader = hasIndexedProperties(indexingType);
unsigned inlineCapacity = structure->inlineCapacity();
unsigned outOfLineCapacity = structure->outOfLineCapacity();
GPRTemporary scratch(this);
GPRTemporary scratch2(this);
GPRReg scratchGPR = scratch.gpr();
GPRReg scratch2GPR = scratch2.gpr();
ASSERT(vectorLength >= numElements);
vectorLength = Butterfly::optimalContiguousVectorLength(structure.get(), vectorLength);
JITCompiler::JumpList slowCases;
size_t size = 0;
if (hasIndexingHeader)
size += vectorLength * sizeof(JSValue) + sizeof(IndexingHeader);
size += outOfLineCapacity * sizeof(JSValue);
m_jit.move(TrustedImmPtr(nullptr), storageGPR);
VM& vm = this->vm();
if (size) {
if (Allocator allocator = vm.jsValueGigacageAuxiliarySpace().allocatorFor(size, AllocatorForMode::AllocatorIfExists)) {
m_jit.emitAllocate(storageGPR, JITAllocator::constant(allocator), scratchGPR, scratch2GPR, slowCases);
m_jit.addPtr(
TrustedImm32(outOfLineCapacity * sizeof(JSValue) + sizeof(IndexingHeader)),
storageGPR);
if (hasIndexingHeader)
m_jit.store32(TrustedImm32(vectorLength), MacroAssembler::Address(storageGPR, Butterfly::offsetOfVectorLength()));
} else
slowCases.append(m_jit.jump());
}
Allocator allocator;
if (structure->typeInfo().type() == JSType::ArrayType)
allocator = allocatorForConcurrently<JSArray>(vm, JSArray::allocationSize(inlineCapacity), AllocatorForMode::AllocatorIfExists);
else
allocator = allocatorForConcurrently<JSFinalObject>(vm, JSFinalObject::allocationSize(inlineCapacity), AllocatorForMode::AllocatorIfExists);
if (allocator) {
emitAllocateJSObject(resultGPR, JITAllocator::constant(allocator), scratchGPR, TrustedImmPtr(structure), storageGPR, scratch2GPR, slowCases);
m_jit.emitInitializeInlineStorage(resultGPR, structure->inlineCapacity());
} else
slowCases.append(m_jit.jump());
// I want a slow path that also loads out the storage pointer, and that's
// what this custom CallArrayAllocatorSlowPathGenerator gives me. It's a lot
// of work for a very small piece of functionality. :-/
addSlowPathGenerator(makeUnique<CallArrayAllocatorSlowPathGenerator>(
slowCases, this, operationNewRawObject, resultGPR, storageGPR,
structure, vectorLength));
if (numElements < vectorLength) {
#if USE(JSVALUE64)
if (hasDouble(structure->indexingType()))
m_jit.move(TrustedImm64(bitwise_cast<int64_t>(PNaN)), scratchGPR);
else
m_jit.move(TrustedImm64(JSValue::encode(JSValue())), scratchGPR);
for (unsigned i = numElements; i < vectorLength; ++i)
m_jit.store64(scratchGPR, MacroAssembler::Address(storageGPR, sizeof(double) * i));
#else
EncodedValueDescriptor value;
if (hasDouble(structure->indexingType()))
value.asInt64 = JSValue::encode(JSValue(JSValue::EncodeAsDouble, PNaN));
else
value.asInt64 = JSValue::encode(JSValue());
for (unsigned i = numElements; i < vectorLength; ++i) {
m_jit.store32(TrustedImm32(value.asBits.tag), MacroAssembler::Address(storageGPR, sizeof(double) * i + OBJECT_OFFSETOF(JSValue, u.asBits.tag)));
m_jit.store32(TrustedImm32(value.asBits.payload), MacroAssembler::Address(storageGPR, sizeof(double) * i + OBJECT_OFFSETOF(JSValue, u.asBits.payload)));
}
#endif
}
if (hasIndexingHeader)
m_jit.store32(TrustedImm32(numElements), MacroAssembler::Address(storageGPR, Butterfly::offsetOfPublicLength()));
m_jit.emitInitializeOutOfLineStorage(storageGPR, structure->outOfLineCapacity());
m_jit.mutatorFence(vm);
}
void SpeculativeJIT::emitGetLength(InlineCallFrame* inlineCallFrame, GPRReg lengthGPR, bool includeThis)
{
if (inlineCallFrame && !inlineCallFrame->isVarargs())
m_jit.move(TrustedImm32(inlineCallFrame->argumentCountIncludingThis - !includeThis), lengthGPR);
else {
VirtualRegister argumentCountRegister = m_jit.argumentCount(inlineCallFrame);
m_jit.load32(JITCompiler::payloadFor(argumentCountRegister), lengthGPR);
if (!includeThis)
m_jit.sub32(TrustedImm32(1), lengthGPR);
}
}
void SpeculativeJIT::emitGetLength(CodeOrigin origin, GPRReg lengthGPR, bool includeThis)
{
emitGetLength(origin.inlineCallFrame(), lengthGPR, includeThis);
}
void SpeculativeJIT::emitGetCallee(CodeOrigin origin, GPRReg calleeGPR)
{
auto* inlineCallFrame = origin.inlineCallFrame();
if (inlineCallFrame) {
if (inlineCallFrame->isClosureCall) {
m_jit.loadPtr(
JITCompiler::addressFor(inlineCallFrame->calleeRecovery.virtualRegister()),
calleeGPR);
} else
m_jit.loadLinkableConstant(JITCompiler::LinkableConstant(m_graph, inlineCallFrame->calleeRecovery.constant().asCell()), calleeGPR);
} else
m_jit.loadPtr(JITCompiler::addressFor(CallFrameSlot::callee), calleeGPR);
}
void SpeculativeJIT::emitGetArgumentStart(CodeOrigin origin, GPRReg startGPR)
{
m_jit.addPtr(
TrustedImm32(
JITCompiler::argumentsStart(origin).offset() * static_cast<int>(sizeof(Register))),
GPRInfo::callFrameRegister, startGPR);
}
MacroAssembler::Jump SpeculativeJIT::emitOSRExitFuzzCheck()
{
if (!Options::useOSRExitFuzz()
|| !canUseOSRExitFuzzing(m_graph.baselineCodeBlockFor(m_origin.semantic))
|| !doOSRExitFuzzing())
return MacroAssembler::Jump();
MacroAssembler::Jump result;
m_jit.pushToSave(GPRInfo::regT0);
m_jit.load32(&g_numberOfOSRExitFuzzChecks, GPRInfo::regT0);
m_jit.add32(TrustedImm32(1), GPRInfo::regT0);
m_jit.store32(GPRInfo::regT0, &g_numberOfOSRExitFuzzChecks);
unsigned atOrAfter = Options::fireOSRExitFuzzAtOrAfter();
unsigned at = Options::fireOSRExitFuzzAt();
if (at || atOrAfter) {
unsigned threshold;
MacroAssembler::RelationalCondition condition;
if (atOrAfter) {
threshold = atOrAfter;
condition = MacroAssembler::Below;
} else {
threshold = at;
condition = MacroAssembler::NotEqual;
}
MacroAssembler::Jump ok = m_jit.branch32(
condition, GPRInfo::regT0, MacroAssembler::TrustedImm32(threshold));
m_jit.popToRestore(GPRInfo::regT0);
result = m_jit.jump();
ok.link(&m_jit);
}
m_jit.popToRestore(GPRInfo::regT0);
return result;
}
void SpeculativeJIT::speculationCheck(ExitKind kind, JSValueSource jsValueSource, Node* node, MacroAssembler::Jump jumpToFail)
{
if (!m_compileOkay)
return;
JITCompiler::Jump fuzzJump = emitOSRExitFuzzCheck();
if (fuzzJump.isSet()) {
JITCompiler::JumpList jumpsToFail;
jumpsToFail.append(fuzzJump);
jumpsToFail.append(jumpToFail);
m_jit.appendExitInfo(jumpsToFail);
} else
m_jit.appendExitInfo(jumpToFail);
m_jit.appendOSRExit(OSRExit(kind, jsValueSource, m_graph.methodOfGettingAValueProfileFor(m_currentNode, node), this, m_stream.size()));
}
void SpeculativeJIT::speculationCheck(ExitKind kind, JSValueSource jsValueSource, Node* node, const MacroAssembler::JumpList& jumpsToFail)
{
if (!m_compileOkay)
return;
JITCompiler::Jump fuzzJump = emitOSRExitFuzzCheck();
if (fuzzJump.isSet()) {
JITCompiler::JumpList myJumpsToFail;
myJumpsToFail.append(jumpsToFail);
myJumpsToFail.append(fuzzJump);
m_jit.appendExitInfo(myJumpsToFail);
} else
m_jit.appendExitInfo(jumpsToFail);
m_jit.appendOSRExit(OSRExit(kind, jsValueSource, m_graph.methodOfGettingAValueProfileFor(m_currentNode, node), this, m_stream.size()));
}
OSRExitJumpPlaceholder SpeculativeJIT::speculationCheck(ExitKind kind, JSValueSource jsValueSource, Node* node)
{
if (!m_compileOkay)
return OSRExitJumpPlaceholder();
unsigned index = m_jit.m_osrExit.size();
m_jit.appendExitInfo();
m_jit.appendOSRExit(OSRExit(kind, jsValueSource, m_graph.methodOfGettingAValueProfileFor(m_currentNode, node), this, m_stream.size()));
return OSRExitJumpPlaceholder(index);
}
OSRExitJumpPlaceholder SpeculativeJIT::speculationCheck(ExitKind kind, JSValueSource jsValueSource, Edge nodeUse)
{
return speculationCheck(kind, jsValueSource, nodeUse.node());
}
void SpeculativeJIT::speculationCheck(ExitKind kind, JSValueSource jsValueSource, Edge nodeUse, MacroAssembler::Jump jumpToFail)
{
speculationCheck(kind, jsValueSource, nodeUse.node(), jumpToFail);
}
void SpeculativeJIT::speculationCheck(ExitKind kind, JSValueSource jsValueSource, Edge nodeUse, const MacroAssembler::JumpList& jumpsToFail)
{
speculationCheck(kind, jsValueSource, nodeUse.node(), jumpsToFail);
}
void SpeculativeJIT::speculationCheck(ExitKind kind, JSValueSource jsValueSource, Node* node, MacroAssembler::Jump jumpToFail, const SpeculationRecovery& recovery)
{
if (!m_compileOkay)
return;
unsigned recoveryIndex = m_jit.appendSpeculationRecovery(recovery);
m_jit.appendExitInfo(jumpToFail);
m_jit.appendOSRExit(OSRExit(kind, jsValueSource, m_graph.methodOfGettingAValueProfileFor(m_currentNode, node), this, m_stream.size(), recoveryIndex));
}
void SpeculativeJIT::speculationCheck(ExitKind kind, JSValueSource jsValueSource, Edge nodeUse, MacroAssembler::Jump jumpToFail, const SpeculationRecovery& recovery)
{
speculationCheck(kind, jsValueSource, nodeUse.node(), jumpToFail, recovery);
}
void SpeculativeJIT::compileInvalidationPoint(Node* node)
{
if (!m_compileOkay)
return;
#if USE(JSVALUE64)
if (m_graph.m_plan.isUnlinked()) {
auto exitJump = m_jit.branchTest8(CCallHelpers::NonZero, CCallHelpers::Address(GPRInfo::constantsRegister, JITData::offsetOfIsInvalidated()));
speculationCheck(UncountableInvalidation, JSValueRegs(), nullptr, exitJump);
noResult(node);
return;
}
#endif
OSRExitCompilationInfo& info = m_jit.appendExitInfo(JITCompiler::JumpList());
m_jit.appendOSRExit(OSRExit(
UncountableInvalidation, JSValueSource(), MethodOfGettingAValueProfile(),
this, m_stream.size()));
info.m_replacementSource = m_jit.watchpointLabel();
RELEASE_ASSERT(info.m_replacementSource.isSet());
noResult(node);
}
void SpeculativeJIT::unreachable(Node* node)
{
m_compileOkay = false;
m_jit.abortWithReason(DFGUnreachableNode, node->op());
}
void SpeculativeJIT::terminateSpeculativeExecution(ExitKind kind, JSValueRegs jsValueRegs, Node* node)
{
if (!m_compileOkay)
return;
speculationCheck(kind, jsValueRegs, node, m_jit.jump());
m_compileOkay = false;
if (verboseCompilationEnabled())
dataLog("Bailing compilation.\n");
}
void SpeculativeJIT::terminateSpeculativeExecution(ExitKind kind, JSValueRegs jsValueRegs, Edge nodeUse)
{
terminateSpeculativeExecution(kind, jsValueRegs, nodeUse.node());
}
void SpeculativeJIT::typeCheck(JSValueSource source, Edge edge, SpeculatedType typesPassedThrough, MacroAssembler::Jump jumpToFail, ExitKind exitKind)
{
ASSERT(needsTypeCheck(edge, typesPassedThrough));
m_interpreter.filter(edge, typesPassedThrough);
speculationCheck(exitKind, source, edge.node(), jumpToFail);
}
void SpeculativeJIT::typeCheck(JSValueSource source, Edge edge, SpeculatedType typesPassedThrough, MacroAssembler::JumpList jumpListToFail, ExitKind exitKind)
{
ASSERT(needsTypeCheck(edge, typesPassedThrough));
m_interpreter.filter(edge, typesPassedThrough);
speculationCheck(exitKind, source, edge.node(), jumpListToFail);
}
RegisterSet SpeculativeJIT::usedRegisters()
{
RegisterSet result;
for (unsigned i = GPRInfo::numberOfRegisters; i--;) {
GPRReg gpr = GPRInfo::toRegister(i);
if (m_gprs.isInUse(gpr))
result.set(gpr);
}
for (unsigned i = FPRInfo::numberOfRegisters; i--;) {
FPRReg fpr = FPRInfo::toRegister(i);
if (m_fprs.isInUse(fpr))
result.set(fpr);
}
// FIXME: This is overly conservative. We could subtract out those callee-saves that we
// actually saved.
// https://bugs.webkit.org/show_bug.cgi?id=185686
result.merge(RegisterSet::stubUnavailableRegisters());
return result;
}
void SpeculativeJIT::addSlowPathGenerator(std::unique_ptr<SlowPathGenerator> slowPathGenerator)
{
m_slowPathGenerators.append(WTFMove(slowPathGenerator));
}
void SpeculativeJIT::addSlowPathGeneratorLambda(Function<void()>&& lambda)
{
m_slowPathLambdas.append(SlowPathLambda { WTFMove(lambda), m_currentNode, static_cast<unsigned>(m_stream.size()) });
}
void SpeculativeJIT::runSlowPathGenerators(PCToCodeOriginMapBuilder& pcToCodeOriginMapBuilder)
{
auto markSlowPathIfNeeded = [&] (Node* node) {
std::optional<JITSizeStatistics::Marker> sizeMarker;
if (UNLIKELY(Options::dumpDFGJITSizeStatistics())) {
String id = makeString("DFG_slow_", m_graph.opName(node->op()));
sizeMarker = vm().jitSizeStatistics->markStart(id, m_jit);
}
return sizeMarker;
};
for (auto& slowPathGenerator : m_slowPathGenerators) {
pcToCodeOriginMapBuilder.appendItem(m_jit.labelIgnoringWatchpoints(), slowPathGenerator->origin().semantic);
auto sizeMarker = markSlowPathIfNeeded(slowPathGenerator->currentNode());
slowPathGenerator->generate(this);
if (UNLIKELY(sizeMarker))
vm().jitSizeStatistics->markEnd(WTFMove(*sizeMarker), m_jit);
}
for (auto& slowPathLambda : m_slowPathLambdas) {
Node* currentNode = slowPathLambda.currentNode;
m_currentNode = currentNode;
m_outOfLineStreamIndex = slowPathLambda.streamIndex;
pcToCodeOriginMapBuilder.appendItem(m_jit.labelIgnoringWatchpoints(), currentNode->origin.semantic);
auto sizeMarker = markSlowPathIfNeeded(currentNode);
slowPathLambda.generator();
m_outOfLineStreamIndex = std::nullopt;
if (UNLIKELY(sizeMarker))
vm().jitSizeStatistics->markEnd(WTFMove(*sizeMarker), m_jit);
}
}
void SpeculativeJIT::clearGenerationInfo()
{
for (unsigned i = 0; i < m_generationInfo.size(); ++i)
m_generationInfo[i] = GenerationInfo();
m_gprs = RegisterBank<GPRInfo>();
m_fprs = RegisterBank<FPRInfo>();
}
SilentRegisterSavePlan SpeculativeJIT::silentSavePlanForGPR(VirtualRegister spillMe, GPRReg source)
{
GenerationInfo& info = generationInfoFromVirtualRegister(spillMe);
Node* node = info.node();
DataFormat registerFormat = info.registerFormat();
ASSERT(registerFormat != DataFormatNone);
ASSERT(registerFormat != DataFormatDouble);
SilentSpillAction spillAction;
SilentFillAction fillAction;
if (!info.needsSpill())
spillAction = DoNothingForSpill;
else {
#if USE(JSVALUE64)
ASSERT(info.gpr() == source);
if (registerFormat == DataFormatInt32)
spillAction = Store32Payload;
else if (registerFormat == DataFormatCell || registerFormat == DataFormatStorage)
spillAction = StorePtr;
else if (registerFormat == DataFormatInt52 || registerFormat == DataFormatStrictInt52)
spillAction = Store64;
else {
ASSERT(registerFormat & DataFormatJS);
spillAction = Store64;
}
#elif USE(JSVALUE32_64)
if (registerFormat & DataFormatJS) {
ASSERT(info.tagGPR() == source || info.payloadGPR() == source);
spillAction = source == info.tagGPR() ? Store32Tag : Store32Payload;
} else {
ASSERT(info.gpr() == source);
spillAction = Store32Payload;
}
#endif
}
if (registerFormat == DataFormatInt32) {
ASSERT(info.gpr() == source);
ASSERT(isJSInt32(info.registerFormat()));
if (node->hasConstant()) {
ASSERT(node->isInt32Constant());
fillAction = SetInt32Constant;
} else
fillAction = Load32Payload;
} else if (registerFormat == DataFormatBoolean) {
#if USE(JSVALUE64)
RELEASE_ASSERT_NOT_REACHED();
#if COMPILER_QUIRK(CONSIDERS_UNREACHABLE_CODE)
fillAction = DoNothingForFill;
#endif
#elif USE(JSVALUE32_64)
ASSERT(info.gpr() == source);
if (node->hasConstant()) {
ASSERT(node->isBooleanConstant());
fillAction = SetBooleanConstant;
} else
fillAction = Load32Payload;
#endif
} else if (registerFormat == DataFormatCell) {
ASSERT(info.gpr() == source);
if (node->hasConstant()) {
DFG_ASSERT(m_graph, m_currentNode, node->isCellConstant());
node->asCell(); // To get the assertion.
fillAction = SetCellConstant;
} else {
#if USE(JSVALUE64)
fillAction = LoadPtr;
#else
fillAction = Load32Payload;
#endif
}
} else if (registerFormat == DataFormatStorage) {
ASSERT(info.gpr() == source);
fillAction = LoadPtr;
} else if (registerFormat == DataFormatInt52) {
if (node->hasConstant())
fillAction = SetInt52Constant;
else if (info.spillFormat() == DataFormatInt52)
fillAction = Load64;
else if (info.spillFormat() == DataFormatStrictInt52)
fillAction = Load64ShiftInt52Left;
else if (info.spillFormat() == DataFormatNone)
fillAction = Load64;
else {
RELEASE_ASSERT_NOT_REACHED();
#if COMPILER_QUIRK(CONSIDERS_UNREACHABLE_CODE)
fillAction = Load64; // Make GCC happy.
#endif
}
} else if (registerFormat == DataFormatStrictInt52) {
if (node->hasConstant())
fillAction = SetStrictInt52Constant;
else if (info.spillFormat() == DataFormatInt52)
fillAction = Load64ShiftInt52Right;
else if (info.spillFormat() == DataFormatStrictInt52)
fillAction = Load64;
else if (info.spillFormat() == DataFormatNone)
fillAction = Load64;
else {
RELEASE_ASSERT_NOT_REACHED();
#if COMPILER_QUIRK(CONSIDERS_UNREACHABLE_CODE)
fillAction = Load64; // Make GCC happy.
#endif
}
} else {
ASSERT(registerFormat & DataFormatJS);
#if USE(JSVALUE64)
ASSERT(info.gpr() == source);
if (node->hasConstant()) {
if (node->isCellConstant())
fillAction = SetTrustedJSConstant;
else
fillAction = SetJSConstant;
} else if (info.spillFormat() == DataFormatInt32) {
ASSERT(registerFormat == DataFormatJSInt32);
fillAction = Load32PayloadBoxInt;
} else
fillAction = Load64;
#else
ASSERT(info.tagGPR() == source || info.payloadGPR() == source);
if (node->hasConstant())
fillAction = info.tagGPR() == source ? SetJSConstantTag : SetJSConstantPayload;
else if (info.payloadGPR() == source)
fillAction = Load32Payload;
else { // Fill the Tag
switch (info.spillFormat()) {
case DataFormatInt32:
ASSERT(registerFormat == DataFormatJSInt32);
fillAction = SetInt32Tag;
break;
case DataFormatCell:
ASSERT(registerFormat == DataFormatJSCell);
fillAction = SetCellTag;
break;
case DataFormatBoolean:
ASSERT(registerFormat == DataFormatJSBoolean);
fillAction = SetBooleanTag;
break;
default:
fillAction = Load32Tag;
break;
}
}
#endif
}
return SilentRegisterSavePlan(spillAction, fillAction, node, source);
}
SilentRegisterSavePlan SpeculativeJIT::silentSavePlanForFPR(VirtualRegister spillMe, FPRReg source)
{
GenerationInfo& info = generationInfoFromVirtualRegister(spillMe);
Node* node = info.node();
ASSERT(info.registerFormat() == DataFormatDouble);
SilentSpillAction spillAction;
SilentFillAction fillAction;
if (!info.needsSpill())
spillAction = DoNothingForSpill;
else {
ASSERT(!node->hasConstant());
ASSERT(info.spillFormat() == DataFormatNone);
ASSERT(info.fpr() == source);
spillAction = StoreDouble;
}
#if USE(JSVALUE64)
if (node->hasConstant()) {
node->asNumber(); // To get the assertion.
fillAction = SetDoubleConstant;
} else {
ASSERT(info.spillFormat() == DataFormatNone || info.spillFormat() == DataFormatDouble);
fillAction = LoadDouble;
}
#elif USE(JSVALUE32_64)
ASSERT(info.registerFormat() == DataFormatDouble);
if (node->hasConstant()) {
node->asNumber(); // To get the assertion.
fillAction = SetDoubleConstant;
} else
fillAction = LoadDouble;
#endif
return SilentRegisterSavePlan(spillAction, fillAction, node, source);
}
void SpeculativeJIT::silentSpill(const SilentRegisterSavePlan& plan)
{
switch (plan.spillAction()) {
case DoNothingForSpill:
break;
case Store32Tag:
m_jit.store32(plan.gpr(), JITCompiler::tagFor(plan.node()->virtualRegister()));
break;
case Store32Payload:
m_jit.store32(plan.gpr(), JITCompiler::payloadFor(plan.node()->virtualRegister()));
break;
case StorePtr:
m_jit.storePtr(plan.gpr(), JITCompiler::addressFor(plan.node()->virtualRegister()));
break;
#if USE(JSVALUE64)
case Store64:
m_jit.store64(plan.gpr(), JITCompiler::addressFor(plan.node()->virtualRegister()));
break;
#endif
case StoreDouble:
m_jit.storeDouble(plan.fpr(), JITCompiler::addressFor(plan.node()->virtualRegister()));
break;
default:
RELEASE_ASSERT_NOT_REACHED();
}
}
void SpeculativeJIT::silentFill(const SilentRegisterSavePlan& plan)
{
switch (plan.fillAction()) {
case DoNothingForFill:
break;
case SetInt32Constant:
m_jit.move(Imm32(plan.node()->asInt32()), plan.gpr());
break;
#if USE(JSVALUE64)
case SetInt52Constant:
m_jit.move(Imm64(plan.node()->asAnyInt() << JSValue::int52ShiftAmount), plan.gpr());
break;
case SetStrictInt52Constant:
m_jit.move(Imm64(plan.node()->asAnyInt()), plan.gpr());
break;
#endif // USE(JSVALUE64)
case SetBooleanConstant:
m_jit.move(TrustedImm32(plan.node()->asBoolean()), plan.gpr());
break;
case SetCellConstant:
ASSERT(plan.node()->constant()->value().isCell());
m_jit.loadLinkableConstant(JITCompiler::LinkableConstant(m_graph, plan.node()->constant()->value().asCell()), plan.gpr());
break;
#if USE(JSVALUE64)
case SetTrustedJSConstant:
m_jit.move(valueOfJSConstantAsImm64(plan.node()).asTrustedImm64(), plan.gpr());
break;
case SetJSConstant:
m_jit.move(valueOfJSConstantAsImm64(plan.node()), plan.gpr());
break;
case SetDoubleConstant:
m_jit.moveDouble(Imm64(reinterpretDoubleToInt64(plan.node()->asNumber())), plan.fpr());
break;
case Load32PayloadBoxInt:
m_jit.load32(JITCompiler::payloadFor(plan.node()->virtualRegister()), plan.gpr());
m_jit.or64(GPRInfo::numberTagRegister, plan.gpr());
break;
case Load32PayloadConvertToInt52:
m_jit.load32(JITCompiler::payloadFor(plan.node()->virtualRegister()), plan.gpr());
m_jit.signExtend32ToPtr(plan.gpr(), plan.gpr());
m_jit.lshift64(TrustedImm32(JSValue::int52ShiftAmount), plan.gpr());
break;
case Load32PayloadSignExtend:
m_jit.load32(JITCompiler::payloadFor(plan.node()->virtualRegister()), plan.gpr());
m_jit.signExtend32ToPtr(plan.gpr(), plan.gpr());
break;
#else
case SetJSConstantTag:
m_jit.move(Imm32(plan.node()->asJSValue().tag()), plan.gpr());
break;
case SetJSConstantPayload:
m_jit.move(Imm32(plan.node()->asJSValue().payload()), plan.gpr());
break;
case SetInt32Tag:
m_jit.move(TrustedImm32(JSValue::Int32Tag), plan.gpr());
break;
case SetCellTag:
m_jit.move(TrustedImm32(JSValue::CellTag), plan.gpr());
break;
case SetBooleanTag:
m_jit.move(TrustedImm32(JSValue::BooleanTag), plan.gpr());
break;
case SetDoubleConstant:
m_jit.loadDouble(TrustedImmPtr(m_jit.addressOfDoubleConstant(plan.node())), plan.fpr());
break;
#endif
case Load32Tag:
m_jit.load32(JITCompiler::tagFor(plan.node()->virtualRegister()), plan.gpr());
break;
case Load32Payload:
m_jit.load32(JITCompiler::payloadFor(plan.node()->virtualRegister()), plan.gpr());
break;
case LoadPtr:
m_jit.loadPtr(JITCompiler::addressFor(plan.node()->virtualRegister()), plan.gpr());
break;
#if USE(JSVALUE64)
case Load64:
m_jit.load64(JITCompiler::addressFor(plan.node()->virtualRegister()), plan.gpr());
break;
case Load64ShiftInt52Right:
m_jit.load64(JITCompiler::addressFor(plan.node()->virtualRegister()), plan.gpr());
m_jit.rshift64(TrustedImm32(JSValue::int52ShiftAmount), plan.gpr());
break;
case Load64ShiftInt52Left:
m_jit.load64(JITCompiler::addressFor(plan.node()->virtualRegister()), plan.gpr());
m_jit.lshift64(TrustedImm32(JSValue::int52ShiftAmount), plan.gpr());
break;
#endif
case LoadDouble:
m_jit.loadDouble(JITCompiler::addressFor(plan.node()->virtualRegister()), plan.fpr());
break;
default:
RELEASE_ASSERT_NOT_REACHED();
}
}
JITCompiler::JumpList SpeculativeJIT::jumpSlowForUnwantedArrayMode(GPRReg tempGPR, ArrayMode arrayMode)
{
JITCompiler::JumpList result;
IndexingType indexingModeMask = IsArray | IndexingShapeMask;
if (arrayMode.action() == Array::Write)
indexingModeMask |= CopyOnWrite;
switch (arrayMode.type()) {
case Array::Int32:
case Array::Double:
case Array::Contiguous:
case Array::Undecided:
case Array::ArrayStorage: {
IndexingType shape = arrayMode.shapeMask();
switch (arrayMode.arrayClass()) {
case Array::OriginalArray:
case Array::OriginalCopyOnWriteArray:
RELEASE_ASSERT_NOT_REACHED();
return result;
case Array::Array:
m_jit.and32(TrustedImm32(indexingModeMask), tempGPR);
result.append(m_jit.branch32(
MacroAssembler::NotEqual, tempGPR, TrustedImm32(IsArray | shape)));
return result;
case Array::NonArray:
case Array::OriginalNonArray:
m_jit.and32(TrustedImm32(indexingModeMask), tempGPR);
result.append(m_jit.branch32(
MacroAssembler::NotEqual, tempGPR, TrustedImm32(shape)));
return result;
case Array::PossiblyArray:
m_jit.and32(TrustedImm32(indexingModeMask & ~IsArray), tempGPR);
result.append(m_jit.branch32(MacroAssembler::NotEqual, tempGPR, TrustedImm32(shape)));
return result;
}
RELEASE_ASSERT_NOT_REACHED();
return result;
}
case Array::SlowPutArrayStorage: {
ASSERT(!arrayMode.isJSArrayWithOriginalStructure());
switch (arrayMode.arrayClass()) {
case Array::OriginalArray:
case Array::OriginalCopyOnWriteArray:
RELEASE_ASSERT_NOT_REACHED();
return result;
case Array::Array:
result.append(
m_jit.branchTest32(
MacroAssembler::Zero, tempGPR, MacroAssembler::TrustedImm32(IsArray)));
break;
case Array::NonArray:
case Array::OriginalNonArray:
result.append(
m_jit.branchTest32(
MacroAssembler::NonZero, tempGPR, MacroAssembler::TrustedImm32(IsArray)));
break;
case Array::PossiblyArray:
break;
}
m_jit.and32(TrustedImm32(IndexingShapeMask), tempGPR);
m_jit.sub32(TrustedImm32(ArrayStorageShape), tempGPR);
result.append(
m_jit.branch32(
MacroAssembler::Above, tempGPR,
TrustedImm32(SlowPutArrayStorageShape - ArrayStorageShape)));
return result;
}
default:
CRASH();
break;
}
return result;
}
void SpeculativeJIT::checkArray(Node* node)
{
ArrayMode arrayMode = node->arrayMode();
ASSERT(arrayMode.isSpecific());
ASSERT(!arrayMode.doesConversion());
SpeculateCellOperand base(this, node->child1());
GPRReg baseReg = base.gpr();
if (arrayMode.alreadyChecked(m_graph, node, m_state.forNode(node->child1()))) {
// We can purge Empty check completely in this case of CheckArrayOrEmpty since CellUse only accepts SpecCell | SpecEmpty.
#if USE(JSVALUE64)
ASSERT(typeFilterFor(node->child1().useKind()) & SpecEmpty);
#endif
noResult(m_currentNode);
return;
}
std::optional<GPRTemporary> temp;
std::optional<GPRReg> tempGPR;
switch (arrayMode.type()) {
case Array::Int32:
case Array::Double:
case Array::Contiguous:
case Array::Undecided:
case Array::ArrayStorage:
case Array::SlowPutArrayStorage: {
temp.emplace(this);
tempGPR = temp->gpr();
break;
}
default:
break;
}
CCallHelpers::Jump isEmpty;
#if USE(JSVALUE64)
if (node->op() == CheckArrayOrEmpty) {
if (m_interpreter.forNode(node->child1()).m_type & SpecEmpty)
isEmpty = m_jit.branchIfEmpty(baseReg);
}
#endif
switch (arrayMode.type()) {
case Array::String:
RELEASE_ASSERT_NOT_REACHED(); // Should have been a Phantom(String:)
return;
case Array::Int32:
case Array::Double:
case Array::Contiguous:
case Array::Undecided:
case Array::ArrayStorage:
case Array::SlowPutArrayStorage: {
m_jit.load8(MacroAssembler::Address(baseReg, JSCell::indexingTypeAndMiscOffset()), tempGPR.value());
speculationCheck(
BadIndexingType, JSValueSource::unboxedCell(baseReg), nullptr,
jumpSlowForUnwantedArrayMode(tempGPR.value(), arrayMode));
break;
}
case Array::DirectArguments:
speculateCellTypeWithoutTypeFiltering(node->child1(), baseReg, DirectArgumentsType);
break;
case Array::ScopedArguments:
speculateCellTypeWithoutTypeFiltering(node->child1(), baseReg, ScopedArgumentsType);
break;
default: {
DFG_ASSERT(m_graph, node, arrayMode.isSomeTypedArrayView());
if (arrayMode.type() == Array::AnyTypedArray)
speculationCheck(BadType, JSValueSource::unboxedCell(baseReg), nullptr, m_jit.branchIfNotType(baseReg, JSTypeRange { JSType(FirstTypedArrayType), JSType(LastTypedArrayTypeExcludingDataView) }));
else
speculateCellTypeWithoutTypeFiltering(node->child1(), baseReg, typeForTypedArrayType(arrayMode.typedArrayType()));
break;
}
}
if (isEmpty.isSet())
isEmpty.link(&m_jit);
noResult(m_currentNode);
}
void SpeculativeJIT::arrayify(Node* node, GPRReg baseReg, GPRReg propertyReg)
{
ASSERT(node->arrayMode().doesConversion());
GPRTemporary temp(this);
GPRTemporary structure;
GPRReg tempGPR = temp.gpr();
GPRReg structureGPR = InvalidGPRReg;
if (node->op() != ArrayifyToStructure) {
GPRTemporary realStructure(this);
structure.adopt(realStructure);
structureGPR = structure.gpr();
}
// We can skip all that comes next if we already have array storage.
MacroAssembler::JumpList slowPath;
if (node->op() == ArrayifyToStructure) {
ASSERT(!isCopyOnWrite(node->structure()->indexingMode()));
ASSERT((node->structure()->indexingType() & IndexingShapeMask) == node->arrayMode().shapeMask());
slowPath.append(m_jit.branchWeakStructure(
JITCompiler::NotEqual,
JITCompiler::Address(baseReg, JSCell::structureIDOffset()),
node->structure()));
} else {
m_jit.load8(
MacroAssembler::Address(baseReg, JSCell::indexingTypeAndMiscOffset()), tempGPR);
slowPath.append(jumpSlowForUnwantedArrayMode(tempGPR, node->arrayMode()));
}
addSlowPathGenerator(makeUnique<ArrayifySlowPathGenerator>(
slowPath, this, node, baseReg, propertyReg, tempGPR, structureGPR));
noResult(m_currentNode);
}
void SpeculativeJIT::arrayify(Node* node)
{
ASSERT(node->arrayMode().isSpecific());
SpeculateCellOperand base(this, node->child1());
if (!node->child2()) {
arrayify(node, base.gpr(), InvalidGPRReg);
return;
}
SpeculateInt32Operand property(this, node->child2());
arrayify(node, base.gpr(), property.gpr());
}
GPRReg SpeculativeJIT::fillStorage(Edge edge)
{
VirtualRegister virtualRegister = edge->virtualRegister();
GenerationInfo& info = generationInfoFromVirtualRegister(virtualRegister);
switch (info.registerFormat()) {
case DataFormatNone: {
if (info.spillFormat() == DataFormatStorage) {