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1771 lines (1470 loc) · 77.2 KB
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/*
* Copyright (C) 2011, 2012, 2013, 2014 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 "Repatch.h"
#if ENABLE(JIT)
#include "AccessorCallJITStubRoutine.h"
#include "CCallHelpers.h"
#include "DFGOperations.h"
#include "DFGSpeculativeJIT.h"
#include "FTLThunks.h"
#include "GCAwareJITStubRoutine.h"
#include "GetterSetter.h"
#include "JIT.h"
#include "JITInlines.h"
#include "LinkBuffer.h"
#include "JSCInlines.h"
#include "PolymorphicGetByIdList.h"
#include "PolymorphicPutByIdList.h"
#include "RegExpMatchesArray.h"
#include "RepatchBuffer.h"
#include "ScratchRegisterAllocator.h"
#include "StackAlignment.h"
#include "StructureRareDataInlines.h"
#include "StructureStubClearingWatchpoint.h"
#include "ThunkGenerators.h"
#include <wtf/StringPrintStream.h>
namespace JSC {
// Beware: in this code, it is not safe to assume anything about the following registers
// that would ordinarily have well-known values:
// - tagTypeNumberRegister
// - tagMaskRegister
static FunctionPtr readCallTarget(RepatchBuffer& repatchBuffer, CodeLocationCall call)
{
FunctionPtr result = MacroAssembler::readCallTarget(call);
#if ENABLE(FTL_JIT)
CodeBlock* codeBlock = repatchBuffer.codeBlock();
if (codeBlock->jitType() == JITCode::FTLJIT) {
return FunctionPtr(codeBlock->vm()->ftlThunks->keyForSlowPathCallThunk(
MacroAssemblerCodePtr::createFromExecutableAddress(
result.executableAddress())).callTarget());
}
#else
UNUSED_PARAM(repatchBuffer);
#endif // ENABLE(FTL_JIT)
return result;
}
static void repatchCall(RepatchBuffer& repatchBuffer, CodeLocationCall call, FunctionPtr newCalleeFunction)
{
#if ENABLE(FTL_JIT)
CodeBlock* codeBlock = repatchBuffer.codeBlock();
if (codeBlock->jitType() == JITCode::FTLJIT) {
VM& vm = *codeBlock->vm();
FTL::Thunks& thunks = *vm.ftlThunks;
FTL::SlowPathCallKey key = thunks.keyForSlowPathCallThunk(
MacroAssemblerCodePtr::createFromExecutableAddress(
MacroAssembler::readCallTarget(call).executableAddress()));
key = key.withCallTarget(newCalleeFunction.executableAddress());
newCalleeFunction = FunctionPtr(
thunks.getSlowPathCallThunk(vm, key).code().executableAddress());
}
#endif // ENABLE(FTL_JIT)
repatchBuffer.relink(call, newCalleeFunction);
}
static void repatchCall(CodeBlock* codeblock, CodeLocationCall call, FunctionPtr newCalleeFunction)
{
RepatchBuffer repatchBuffer(codeblock);
repatchCall(repatchBuffer, call, newCalleeFunction);
}
static void repatchByIdSelfAccess(VM& vm, CodeBlock* codeBlock, StructureStubInfo& stubInfo, Structure* structure, const Identifier& propertyName, PropertyOffset offset,
const FunctionPtr &slowPathFunction, bool compact)
{
if (structure->typeInfo().newImpurePropertyFiresWatchpoints())
vm.registerWatchpointForImpureProperty(propertyName, stubInfo.addWatchpoint(codeBlock));
RepatchBuffer repatchBuffer(codeBlock);
// Only optimize once!
repatchCall(repatchBuffer, stubInfo.callReturnLocation, slowPathFunction);
// Patch the structure check & the offset of the load.
repatchBuffer.repatch(stubInfo.callReturnLocation.dataLabel32AtOffset(-(intptr_t)stubInfo.patch.deltaCheckImmToCall), bitwise_cast<int32_t>(structure->id()));
repatchBuffer.setLoadInstructionIsActive(stubInfo.callReturnLocation.convertibleLoadAtOffset(stubInfo.patch.deltaCallToStorageLoad), isOutOfLineOffset(offset));
#if USE(JSVALUE64)
if (compact)
repatchBuffer.repatch(stubInfo.callReturnLocation.dataLabelCompactAtOffset(stubInfo.patch.deltaCallToLoadOrStore), offsetRelativeToPatchedStorage(offset));
else
repatchBuffer.repatch(stubInfo.callReturnLocation.dataLabel32AtOffset(stubInfo.patch.deltaCallToLoadOrStore), offsetRelativeToPatchedStorage(offset));
#elif USE(JSVALUE32_64)
if (compact) {
repatchBuffer.repatch(stubInfo.callReturnLocation.dataLabelCompactAtOffset(stubInfo.patch.deltaCallToTagLoadOrStore), offsetRelativeToPatchedStorage(offset) + OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.tag));
repatchBuffer.repatch(stubInfo.callReturnLocation.dataLabelCompactAtOffset(stubInfo.patch.deltaCallToPayloadLoadOrStore), offsetRelativeToPatchedStorage(offset) + OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.payload));
} else {
repatchBuffer.repatch(stubInfo.callReturnLocation.dataLabel32AtOffset(stubInfo.patch.deltaCallToTagLoadOrStore), offsetRelativeToPatchedStorage(offset) + OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.tag));
repatchBuffer.repatch(stubInfo.callReturnLocation.dataLabel32AtOffset(stubInfo.patch.deltaCallToPayloadLoadOrStore), offsetRelativeToPatchedStorage(offset) + OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.payload));
}
#endif
}
static void addStructureTransitionCheck(
JSCell* object, Structure* structure, CodeBlock* codeBlock, StructureStubInfo& stubInfo,
MacroAssembler& jit, MacroAssembler::JumpList& failureCases, GPRReg scratchGPR)
{
if (object->structure() == structure && structure->transitionWatchpointSetIsStillValid()) {
structure->addTransitionWatchpoint(stubInfo.addWatchpoint(codeBlock));
if (!ASSERT_DISABLED) {
// If we execute this code, the object must have the structure we expect. Assert
// this in debug modes.
jit.move(MacroAssembler::TrustedImmPtr(object), scratchGPR);
MacroAssembler::Jump ok = branchStructure(
jit,
MacroAssembler::Equal,
MacroAssembler::Address(scratchGPR, JSCell::structureIDOffset()),
structure);
jit.abortWithReason(RepatchIneffectiveWatchpoint);
ok.link(&jit);
}
return;
}
jit.move(MacroAssembler::TrustedImmPtr(object), scratchGPR);
failureCases.append(
branchStructure(jit,
MacroAssembler::NotEqual,
MacroAssembler::Address(scratchGPR, JSCell::structureIDOffset()),
structure));
}
static void addStructureTransitionCheck(
JSValue prototype, CodeBlock* codeBlock, StructureStubInfo& stubInfo,
MacroAssembler& jit, MacroAssembler::JumpList& failureCases, GPRReg scratchGPR)
{
if (prototype.isNull())
return;
ASSERT(prototype.isCell());
addStructureTransitionCheck(
prototype.asCell(), prototype.asCell()->structure(), codeBlock, stubInfo, jit,
failureCases, scratchGPR);
}
static void replaceWithJump(RepatchBuffer& repatchBuffer, StructureStubInfo& stubInfo, const MacroAssemblerCodePtr target)
{
if (MacroAssembler::canJumpReplacePatchableBranch32WithPatch()) {
repatchBuffer.replaceWithJump(
RepatchBuffer::startOfPatchableBranch32WithPatchOnAddress(
stubInfo.callReturnLocation.dataLabel32AtOffset(
-(intptr_t)stubInfo.patch.deltaCheckImmToCall)),
CodeLocationLabel(target));
return;
}
repatchBuffer.relink(
stubInfo.callReturnLocation.jumpAtOffset(
stubInfo.patch.deltaCallToJump),
CodeLocationLabel(target));
}
static void emitRestoreScratch(MacroAssembler& stubJit, bool needToRestoreScratch, GPRReg scratchGPR, MacroAssembler::Jump& success, MacroAssembler::Jump& fail, MacroAssembler::JumpList failureCases)
{
if (needToRestoreScratch) {
stubJit.popToRestore(scratchGPR);
success = stubJit.jump();
// link failure cases here, so we can pop scratchGPR, and then jump back.
failureCases.link(&stubJit);
stubJit.popToRestore(scratchGPR);
fail = stubJit.jump();
return;
}
success = stubJit.jump();
}
static void linkRestoreScratch(LinkBuffer& patchBuffer, bool needToRestoreScratch, MacroAssembler::Jump success, MacroAssembler::Jump fail, MacroAssembler::JumpList failureCases, CodeLocationLabel successLabel, CodeLocationLabel slowCaseBegin)
{
patchBuffer.link(success, successLabel);
if (needToRestoreScratch) {
patchBuffer.link(fail, slowCaseBegin);
return;
}
// link failure cases directly back to normal path
patchBuffer.link(failureCases, slowCaseBegin);
}
static void linkRestoreScratch(LinkBuffer& patchBuffer, bool needToRestoreScratch, StructureStubInfo& stubInfo, MacroAssembler::Jump success, MacroAssembler::Jump fail, MacroAssembler::JumpList failureCases)
{
linkRestoreScratch(patchBuffer, needToRestoreScratch, success, fail, failureCases, stubInfo.callReturnLocation.labelAtOffset(stubInfo.patch.deltaCallToDone), stubInfo.callReturnLocation.labelAtOffset(stubInfo.patch.deltaCallToSlowCase));
}
enum ByIdStubKind {
GetValue,
CallGetter,
CallCustomGetter,
CallSetter,
CallCustomSetter
};
static const char* toString(ByIdStubKind kind)
{
switch (kind) {
case GetValue:
return "GetValue";
case CallGetter:
return "CallGetter";
case CallCustomGetter:
return "CallCustomGetter";
case CallSetter:
return "CallSetter";
case CallCustomSetter:
return "CallCustomSetter";
default:
RELEASE_ASSERT_NOT_REACHED();
return nullptr;
}
}
static ByIdStubKind kindFor(const PropertySlot& slot)
{
if (slot.isCacheableValue())
return GetValue;
if (slot.isCacheableCustom())
return CallCustomGetter;
RELEASE_ASSERT(slot.isCacheableGetter());
return CallGetter;
}
static FunctionPtr customFor(const PropertySlot& slot)
{
if (!slot.isCacheableCustom())
return FunctionPtr();
return FunctionPtr(slot.customGetter());
}
static ByIdStubKind kindFor(const PutPropertySlot& slot)
{
RELEASE_ASSERT(!slot.isCacheablePut());
if (slot.isCacheableSetter())
return CallSetter;
RELEASE_ASSERT(slot.isCacheableCustom());
return CallCustomSetter;
}
static FunctionPtr customFor(const PutPropertySlot& slot)
{
if (!slot.isCacheableCustom())
return FunctionPtr();
return FunctionPtr(slot.customSetter());
}
static void generateByIdStub(
ExecState* exec, ByIdStubKind kind, const Identifier& propertyName,
FunctionPtr custom, StructureStubInfo& stubInfo, StructureChain* chain, size_t count,
PropertyOffset offset, Structure* structure, bool loadTargetFromProxy, WatchpointSet* watchpointSet,
CodeLocationLabel successLabel, CodeLocationLabel slowCaseLabel, RefPtr<JITStubRoutine>& stubRoutine)
{
VM* vm = &exec->vm();
GPRReg baseGPR = static_cast<GPRReg>(stubInfo.patch.baseGPR);
JSValueRegs valueRegs = JSValueRegs(
#if USE(JSVALUE32_64)
static_cast<GPRReg>(stubInfo.patch.valueTagGPR),
#endif
static_cast<GPRReg>(stubInfo.patch.valueGPR));
GPRReg scratchGPR = TempRegisterSet(stubInfo.patch.usedRegisters).getFreeGPR();
bool needToRestoreScratch = scratchGPR == InvalidGPRReg;
RELEASE_ASSERT(!needToRestoreScratch || kind == GetValue);
CCallHelpers stubJit(&exec->vm(), exec->codeBlock());
if (needToRestoreScratch) {
scratchGPR = AssemblyHelpers::selectScratchGPR(
baseGPR, valueRegs.tagGPR(), valueRegs.payloadGPR());
stubJit.pushToSave(scratchGPR);
needToRestoreScratch = true;
}
MacroAssembler::JumpList failureCases;
GPRReg baseForGetGPR;
if (loadTargetFromProxy) {
baseForGetGPR = valueRegs.payloadGPR();
failureCases.append(stubJit.branch8(
MacroAssembler::NotEqual,
MacroAssembler::Address(baseGPR, JSCell::typeInfoTypeOffset()),
MacroAssembler::TrustedImm32(PureForwardingProxyType)));
stubJit.loadPtr(MacroAssembler::Address(baseGPR, JSProxy::targetOffset()), scratchGPR);
failureCases.append(branchStructure(stubJit,
MacroAssembler::NotEqual,
MacroAssembler::Address(scratchGPR, JSCell::structureIDOffset()),
structure));
} else {
baseForGetGPR = baseGPR;
failureCases.append(branchStructure(stubJit,
MacroAssembler::NotEqual,
MacroAssembler::Address(baseForGetGPR, JSCell::structureIDOffset()),
structure));
}
CodeBlock* codeBlock = exec->codeBlock();
if (structure->typeInfo().newImpurePropertyFiresWatchpoints())
vm->registerWatchpointForImpureProperty(propertyName, stubInfo.addWatchpoint(codeBlock));
if (watchpointSet)
watchpointSet->add(stubInfo.addWatchpoint(codeBlock));
Structure* currStructure = structure;
JSObject* protoObject = 0;
if (chain) {
WriteBarrier<Structure>* it = chain->head();
for (unsigned i = 0; i < count; ++i, ++it) {
protoObject = asObject(currStructure->prototypeForLookup(exec));
Structure* protoStructure = protoObject->structure();
if (protoStructure->typeInfo().newImpurePropertyFiresWatchpoints())
vm->registerWatchpointForImpureProperty(propertyName, stubInfo.addWatchpoint(codeBlock));
addStructureTransitionCheck(
protoObject, protoStructure, codeBlock, stubInfo, stubJit,
failureCases, scratchGPR);
currStructure = it->get();
}
}
GPRReg baseForAccessGPR;
if (chain) {
// We could have clobbered scratchGPR earlier, so we have to reload from baseGPR to get the target.
if (loadTargetFromProxy)
stubJit.loadPtr(MacroAssembler::Address(baseGPR, JSProxy::targetOffset()), baseForGetGPR);
stubJit.move(MacroAssembler::TrustedImmPtr(protoObject), scratchGPR);
baseForAccessGPR = scratchGPR;
} else {
// For proxy objects, we need to do all the Structure checks before moving the baseGPR into
// baseForGetGPR because if we fail any of the checks then we would have the wrong value in baseGPR
// on the slow path.
if (loadTargetFromProxy)
stubJit.move(scratchGPR, baseForGetGPR);
baseForAccessGPR = baseForGetGPR;
}
GPRReg loadedValueGPR = InvalidGPRReg;
if (kind != CallCustomGetter && kind != CallCustomSetter) {
if (kind == GetValue)
loadedValueGPR = valueRegs.payloadGPR();
else
loadedValueGPR = scratchGPR;
GPRReg storageGPR;
if (isInlineOffset(offset))
storageGPR = baseForAccessGPR;
else {
stubJit.loadPtr(MacroAssembler::Address(baseForAccessGPR, JSObject::butterflyOffset()), loadedValueGPR);
storageGPR = loadedValueGPR;
}
#if USE(JSVALUE64)
stubJit.load64(MacroAssembler::Address(storageGPR, offsetRelativeToBase(offset)), loadedValueGPR);
#else
if (kind == GetValue)
stubJit.load32(MacroAssembler::Address(storageGPR, offsetRelativeToBase(offset) + TagOffset), valueRegs.tagGPR());
stubJit.load32(MacroAssembler::Address(storageGPR, offsetRelativeToBase(offset) + PayloadOffset), loadedValueGPR);
#endif
}
// Stuff for custom getters.
MacroAssembler::Call operationCall;
MacroAssembler::Call handlerCall;
// Stuff for JS getters.
MacroAssembler::DataLabelPtr addressOfLinkFunctionCheck;
MacroAssembler::Call fastPathCall;
MacroAssembler::Call slowPathCall;
std::unique_ptr<CallLinkInfo> callLinkInfo;
MacroAssembler::Jump success, fail;
if (kind != GetValue) {
// Need to make sure that whenever this call is made in the future, we remember the
// place that we made it from. It just so happens to be the place that we are at
// right now!
stubJit.store32(MacroAssembler::TrustedImm32(exec->locationAsRawBits()),
CCallHelpers::tagFor(static_cast<VirtualRegister>(JSStack::ArgumentCount)));
if (kind == CallGetter || kind == CallSetter) {
// Create a JS call using a JS call inline cache. Assume that:
//
// - SP is aligned and represents the extent of the calling compiler's stack usage.
//
// - FP is set correctly (i.e. it points to the caller's call frame header).
//
// - SP - FP is an aligned difference.
//
// - Any byte between FP (exclusive) and SP (inclusive) could be live in the calling
// code.
//
// Therefore, we temporarily grow the stack for the purpose of the call and then
// shrink it after.
callLinkInfo = std::make_unique<CallLinkInfo>();
callLinkInfo->callType = CallLinkInfo::Call;
callLinkInfo->codeOrigin = stubInfo.codeOrigin;
callLinkInfo->calleeGPR = loadedValueGPR;
MacroAssembler::JumpList done;
// There is a 'this' argument but nothing else.
unsigned numberOfParameters = 1;
// ... unless we're calling a setter.
if (kind == CallSetter)
numberOfParameters++;
// Get the accessor; if there ain't one then the result is jsUndefined().
if (kind == CallSetter) {
stubJit.loadPtr(
MacroAssembler::Address(loadedValueGPR, GetterSetter::offsetOfSetter()),
loadedValueGPR);
} else {
stubJit.loadPtr(
MacroAssembler::Address(loadedValueGPR, GetterSetter::offsetOfGetter()),
loadedValueGPR);
}
MacroAssembler::Jump returnUndefined = stubJit.branchTestPtr(
MacroAssembler::Zero, loadedValueGPR);
unsigned numberOfRegsForCall =
JSStack::CallFrameHeaderSize + numberOfParameters;
unsigned numberOfBytesForCall =
numberOfRegsForCall * sizeof(Register) - sizeof(CallerFrameAndPC);
unsigned alignedNumberOfBytesForCall =
WTF::roundUpToMultipleOf(stackAlignmentBytes(), numberOfBytesForCall);
stubJit.subPtr(
MacroAssembler::TrustedImm32(alignedNumberOfBytesForCall),
MacroAssembler::stackPointerRegister);
MacroAssembler::Address calleeFrame = MacroAssembler::Address(
MacroAssembler::stackPointerRegister,
-static_cast<ptrdiff_t>(sizeof(CallerFrameAndPC)));
stubJit.store32(
MacroAssembler::TrustedImm32(numberOfParameters),
calleeFrame.withOffset(
JSStack::ArgumentCount * sizeof(Register) + PayloadOffset));
stubJit.storeCell(
loadedValueGPR, calleeFrame.withOffset(JSStack::Callee * sizeof(Register)));
stubJit.storeCell(
baseForGetGPR,
calleeFrame.withOffset(
virtualRegisterForArgument(0).offset() * sizeof(Register)));
if (kind == CallSetter) {
stubJit.storeValue(
valueRegs,
calleeFrame.withOffset(
virtualRegisterForArgument(1).offset() * sizeof(Register)));
}
MacroAssembler::Jump slowCase = stubJit.branchPtrWithPatch(
MacroAssembler::NotEqual, loadedValueGPR, addressOfLinkFunctionCheck,
MacroAssembler::TrustedImmPtr(0));
// loadedValueGPR is already burned. We can reuse it. From here on we assume that
// any volatile register will be clobbered anyway.
stubJit.loadPtr(
MacroAssembler::Address(loadedValueGPR, JSFunction::offsetOfScopeChain()),
loadedValueGPR);
stubJit.storeCell(
loadedValueGPR, calleeFrame.withOffset(JSStack::ScopeChain * sizeof(Register)));
fastPathCall = stubJit.nearCall();
stubJit.addPtr(
MacroAssembler::TrustedImm32(alignedNumberOfBytesForCall),
MacroAssembler::stackPointerRegister);
if (kind == CallGetter)
stubJit.setupResults(valueRegs);
done.append(stubJit.jump());
slowCase.link(&stubJit);
stubJit.move(loadedValueGPR, GPRInfo::regT0);
#if USE(JSVALUE32_64)
stubJit.move(MacroAssembler::TrustedImm32(JSValue::CellTag), GPRInfo::regT1);
#endif
stubJit.move(MacroAssembler::TrustedImmPtr(callLinkInfo.get()), GPRInfo::regT2);
slowPathCall = stubJit.nearCall();
stubJit.addPtr(
MacroAssembler::TrustedImm32(alignedNumberOfBytesForCall),
MacroAssembler::stackPointerRegister);
if (kind == CallGetter)
stubJit.setupResults(valueRegs);
done.append(stubJit.jump());
returnUndefined.link(&stubJit);
if (kind == CallGetter)
stubJit.moveTrustedValue(jsUndefined(), valueRegs);
done.link(&stubJit);
} else {
// getter: EncodedJSValue (*GetValueFunc)(ExecState*, JSObject* slotBase, EncodedJSValue thisValue, PropertyName);
// setter: void (*PutValueFunc)(ExecState*, JSObject* base, EncodedJSValue thisObject, EncodedJSValue value);
#if USE(JSVALUE64)
if (kind == CallCustomGetter)
stubJit.setupArgumentsWithExecState(baseForAccessGPR, baseForGetGPR, MacroAssembler::TrustedImmPtr(propertyName.impl()));
else
stubJit.setupArgumentsWithExecState(baseForAccessGPR, baseForGetGPR, valueRegs.gpr());
#else
if (kind == CallCustomGetter)
stubJit.setupArgumentsWithExecState(baseForAccessGPR, baseForGetGPR, MacroAssembler::TrustedImm32(JSValue::CellTag), MacroAssembler::TrustedImmPtr(propertyName.impl()));
else
stubJit.setupArgumentsWithExecState(baseForAccessGPR, baseForGetGPR, MacroAssembler::TrustedImm32(JSValue::CellTag), valueRegs.payloadGPR(), valueRegs.tagGPR());
#endif
stubJit.storePtr(GPRInfo::callFrameRegister, &vm->topCallFrame);
operationCall = stubJit.call();
if (kind == CallCustomGetter)
stubJit.setupResults(valueRegs);
MacroAssembler::Jump noException = stubJit.emitExceptionCheck(CCallHelpers::InvertedExceptionCheck);
stubJit.setupArguments(CCallHelpers::TrustedImmPtr(vm), GPRInfo::callFrameRegister);
handlerCall = stubJit.call();
stubJit.jumpToExceptionHandler();
noException.link(&stubJit);
}
}
emitRestoreScratch(stubJit, needToRestoreScratch, scratchGPR, success, fail, failureCases);
LinkBuffer patchBuffer(*vm, stubJit, exec->codeBlock());
linkRestoreScratch(patchBuffer, needToRestoreScratch, success, fail, failureCases, successLabel, slowCaseLabel);
if (kind == CallCustomGetter || kind == CallCustomSetter) {
patchBuffer.link(operationCall, custom);
patchBuffer.link(handlerCall, lookupExceptionHandler);
} else if (kind == CallGetter || kind == CallSetter) {
callLinkInfo->hotPathOther = patchBuffer.locationOfNearCall(fastPathCall);
callLinkInfo->hotPathBegin = patchBuffer.locationOf(addressOfLinkFunctionCheck);
callLinkInfo->callReturnLocation = patchBuffer.locationOfNearCall(slowPathCall);
ThunkGenerator generator = linkThunkGeneratorFor(
CodeForCall, RegisterPreservationNotRequired);
patchBuffer.link(
slowPathCall, CodeLocationLabel(vm->getCTIStub(generator).code()));
}
MacroAssemblerCodeRef code = FINALIZE_CODE_FOR(
exec->codeBlock(), patchBuffer,
("%s access stub for %s, return point %p",
toString(kind), toCString(*exec->codeBlock()).data(),
successLabel.executableAddress()));
if (kind == CallGetter || kind == CallSetter)
stubRoutine = adoptRef(new AccessorCallJITStubRoutine(code, *vm, WTF::move(callLinkInfo)));
else
stubRoutine = createJITStubRoutine(code, *vm, codeBlock->ownerExecutable(), true);
}
enum InlineCacheAction {
GiveUpOnCache,
RetryCacheLater,
AttemptToCache
};
static InlineCacheAction actionForCell(VM& vm, JSCell* cell)
{
Structure* structure = cell->structure(vm);
TypeInfo typeInfo = structure->typeInfo();
if (typeInfo.prohibitsPropertyCaching())
return GiveUpOnCache;
if (structure->isUncacheableDictionary()) {
if (structure->hasBeenFlattenedBefore())
return GiveUpOnCache;
// Flattening could have changed the offset, so return early for another try.
asObject(cell)->flattenDictionaryObject(vm);
return RetryCacheLater;
}
ASSERT(!structure->isUncacheableDictionary());
if (typeInfo.hasImpureGetOwnPropertySlot() && !typeInfo.newImpurePropertyFiresWatchpoints())
return GiveUpOnCache;
return AttemptToCache;
}
static InlineCacheAction tryCacheGetByID(ExecState* exec, JSValue baseValue, const Identifier& propertyName, const PropertySlot& slot, StructureStubInfo& stubInfo)
{
if (Options::forceICFailure())
return GiveUpOnCache;
// FIXME: Write a test that proves we need to check for recursion here just
// like the interpreter does, then add a check for recursion.
CodeBlock* codeBlock = exec->codeBlock();
VM* vm = &exec->vm();
if ((isJSArray(baseValue) || isRegExpMatchesArray(baseValue) || isJSString(baseValue)) && propertyName == exec->propertyNames().length) {
GPRReg baseGPR = static_cast<GPRReg>(stubInfo.patch.baseGPR);
#if USE(JSVALUE32_64)
GPRReg resultTagGPR = static_cast<GPRReg>(stubInfo.patch.valueTagGPR);
#endif
GPRReg resultGPR = static_cast<GPRReg>(stubInfo.patch.valueGPR);
MacroAssembler stubJit;
if (isJSArray(baseValue) || isRegExpMatchesArray(baseValue)) {
GPRReg scratchGPR = TempRegisterSet(stubInfo.patch.usedRegisters).getFreeGPR();
bool needToRestoreScratch = false;
if (scratchGPR == InvalidGPRReg) {
#if USE(JSVALUE64)
scratchGPR = AssemblyHelpers::selectScratchGPR(baseGPR, resultGPR);
#else
scratchGPR = AssemblyHelpers::selectScratchGPR(baseGPR, resultGPR, resultTagGPR);
#endif
stubJit.pushToSave(scratchGPR);
needToRestoreScratch = true;
}
MacroAssembler::JumpList failureCases;
stubJit.load8(MacroAssembler::Address(baseGPR, JSCell::indexingTypeOffset()), scratchGPR);
failureCases.append(stubJit.branchTest32(MacroAssembler::Zero, scratchGPR, MacroAssembler::TrustedImm32(IsArray)));
failureCases.append(stubJit.branchTest32(MacroAssembler::Zero, scratchGPR, MacroAssembler::TrustedImm32(IndexingShapeMask)));
stubJit.loadPtr(MacroAssembler::Address(baseGPR, JSObject::butterflyOffset()), scratchGPR);
stubJit.load32(MacroAssembler::Address(scratchGPR, ArrayStorage::lengthOffset()), scratchGPR);
failureCases.append(stubJit.branch32(MacroAssembler::LessThan, scratchGPR, MacroAssembler::TrustedImm32(0)));
stubJit.move(scratchGPR, resultGPR);
#if USE(JSVALUE64)
stubJit.or64(AssemblyHelpers::TrustedImm64(TagTypeNumber), resultGPR);
#elif USE(JSVALUE32_64)
stubJit.move(AssemblyHelpers::TrustedImm32(0xffffffff), resultTagGPR); // JSValue::Int32Tag
#endif
MacroAssembler::Jump success, fail;
emitRestoreScratch(stubJit, needToRestoreScratch, scratchGPR, success, fail, failureCases);
LinkBuffer patchBuffer(*vm, stubJit, codeBlock);
linkRestoreScratch(patchBuffer, needToRestoreScratch, stubInfo, success, fail, failureCases);
stubInfo.stubRoutine = FINALIZE_CODE_FOR_STUB(
exec->codeBlock(), patchBuffer,
("GetById array length stub for %s, return point %p",
toCString(*exec->codeBlock()).data(), stubInfo.callReturnLocation.labelAtOffset(
stubInfo.patch.deltaCallToDone).executableAddress()));
RepatchBuffer repatchBuffer(codeBlock);
replaceWithJump(repatchBuffer, stubInfo, stubInfo.stubRoutine->code().code());
repatchCall(repatchBuffer, stubInfo.callReturnLocation, operationGetById);
return RetryCacheLater;
}
// String.length case
MacroAssembler::Jump failure = stubJit.branch8(MacroAssembler::NotEqual, MacroAssembler::Address(baseGPR, JSCell::typeInfoTypeOffset()), MacroAssembler::TrustedImm32(StringType));
stubJit.load32(MacroAssembler::Address(baseGPR, JSString::offsetOfLength()), resultGPR);
#if USE(JSVALUE64)
stubJit.or64(AssemblyHelpers::TrustedImm64(TagTypeNumber), resultGPR);
#elif USE(JSVALUE32_64)
stubJit.move(AssemblyHelpers::TrustedImm32(0xffffffff), resultTagGPR); // JSValue::Int32Tag
#endif
MacroAssembler::Jump success = stubJit.jump();
LinkBuffer patchBuffer(*vm, stubJit, codeBlock);
patchBuffer.link(success, stubInfo.callReturnLocation.labelAtOffset(stubInfo.patch.deltaCallToDone));
patchBuffer.link(failure, stubInfo.callReturnLocation.labelAtOffset(stubInfo.patch.deltaCallToSlowCase));
stubInfo.stubRoutine = FINALIZE_CODE_FOR_STUB(
exec->codeBlock(), patchBuffer,
("GetById string length stub for %s, return point %p",
toCString(*exec->codeBlock()).data(), stubInfo.callReturnLocation.labelAtOffset(
stubInfo.patch.deltaCallToDone).executableAddress()));
RepatchBuffer repatchBuffer(codeBlock);
replaceWithJump(repatchBuffer, stubInfo, stubInfo.stubRoutine->code().code());
repatchCall(repatchBuffer, stubInfo.callReturnLocation, operationGetById);
return RetryCacheLater;
}
// FIXME: Cache property access for immediates.
if (!baseValue.isCell())
return GiveUpOnCache;
JSCell* baseCell = baseValue.asCell();
Structure* structure = baseCell->structure();
if (!slot.isCacheable())
return GiveUpOnCache;
InlineCacheAction action = actionForCell(*vm, baseCell);
if (action != AttemptToCache)
return action;
// Optimize self access.
if (slot.slotBase() == baseValue
&& slot.isCacheableValue()
&& !slot.watchpointSet()
&& MacroAssembler::isCompactPtrAlignedAddressOffset(maxOffsetRelativeToPatchedStorage(slot.cachedOffset()))) {
repatchByIdSelfAccess(*vm, codeBlock, stubInfo, structure, propertyName, slot.cachedOffset(), operationGetByIdBuildList, true);
stubInfo.initGetByIdSelf(*vm, codeBlock->ownerExecutable(), structure);
return RetryCacheLater;
}
repatchCall(codeBlock, stubInfo.callReturnLocation, operationGetByIdBuildList);
return RetryCacheLater;
}
void repatchGetByID(ExecState* exec, JSValue baseValue, const Identifier& propertyName, const PropertySlot& slot, StructureStubInfo& stubInfo)
{
GCSafeConcurrentJITLocker locker(exec->codeBlock()->m_lock, exec->vm().heap);
if (tryCacheGetByID(exec, baseValue, propertyName, slot, stubInfo) == GiveUpOnCache)
repatchCall(exec->codeBlock(), stubInfo.callReturnLocation, operationGetById);
}
static void patchJumpToGetByIdStub(CodeBlock* codeBlock, StructureStubInfo& stubInfo, JITStubRoutine* stubRoutine)
{
RELEASE_ASSERT(stubInfo.accessType == access_get_by_id_list);
RepatchBuffer repatchBuffer(codeBlock);
if (stubInfo.u.getByIdList.list->didSelfPatching()) {
repatchBuffer.relink(
stubInfo.callReturnLocation.jumpAtOffset(
stubInfo.patch.deltaCallToJump),
CodeLocationLabel(stubRoutine->code().code()));
return;
}
replaceWithJump(repatchBuffer, stubInfo, stubRoutine->code().code());
}
static InlineCacheAction tryBuildGetByIDList(ExecState* exec, JSValue baseValue, const Identifier& ident, const PropertySlot& slot, StructureStubInfo& stubInfo)
{
if (!baseValue.isCell()
|| !slot.isCacheable())
return GiveUpOnCache;
JSCell* baseCell = baseValue.asCell();
bool loadTargetFromProxy = false;
if (baseCell->type() == PureForwardingProxyType) {
baseValue = jsCast<JSProxy*>(baseCell)->target();
baseCell = baseValue.asCell();
loadTargetFromProxy = true;
}
VM* vm = &exec->vm();
CodeBlock* codeBlock = exec->codeBlock();
InlineCacheAction action = actionForCell(*vm, baseCell);
if (action != AttemptToCache)
return action;
Structure* structure = baseCell->structure(*vm);
TypeInfo typeInfo = structure->typeInfo();
if (stubInfo.patch.spillMode == NeedToSpill) {
// We cannot do as much inline caching if the registers were not flushed prior to this GetById. In particular,
// non-Value cached properties require planting calls, which requires registers to have been flushed. Thus,
// if registers were not flushed, don't do non-Value caching.
if (!slot.isCacheableValue())
return GiveUpOnCache;
}
PropertyOffset offset = slot.cachedOffset();
StructureChain* prototypeChain = 0;
size_t count = 0;
if (slot.slotBase() != baseValue) {
if (typeInfo.prohibitsPropertyCaching() || structure->isDictionary())
return GiveUpOnCache;
count = normalizePrototypeChainForChainAccess(
exec, baseValue, slot.slotBase(), ident, offset);
if (count == InvalidPrototypeChain)
return GiveUpOnCache;
prototypeChain = structure->prototypeChain(exec);
}
PolymorphicGetByIdList* list = PolymorphicGetByIdList::from(stubInfo);
if (list->isFull()) {
// We need this extra check because of recursion.
return GiveUpOnCache;
}
RefPtr<JITStubRoutine> stubRoutine;
generateByIdStub(
exec, kindFor(slot), ident, customFor(slot), stubInfo, prototypeChain, count, offset,
structure, loadTargetFromProxy, slot.watchpointSet(),
stubInfo.callReturnLocation.labelAtOffset(stubInfo.patch.deltaCallToDone),
CodeLocationLabel(list->currentSlowPathTarget(stubInfo)), stubRoutine);
GetByIdAccess::AccessType accessType;
if (slot.isCacheableValue())
accessType = slot.watchpointSet() ? GetByIdAccess::WatchedStub : GetByIdAccess::SimpleStub;
else if (slot.isCacheableGetter())
accessType = GetByIdAccess::Getter;
else
accessType = GetByIdAccess::CustomGetter;
list->addAccess(GetByIdAccess(
*vm, codeBlock->ownerExecutable(), accessType, stubRoutine, structure,
prototypeChain, count));
patchJumpToGetByIdStub(codeBlock, stubInfo, stubRoutine.get());
return list->isFull() ? GiveUpOnCache : RetryCacheLater;
}
void buildGetByIDList(ExecState* exec, JSValue baseValue, const Identifier& propertyName, const PropertySlot& slot, StructureStubInfo& stubInfo)
{
GCSafeConcurrentJITLocker locker(exec->codeBlock()->m_lock, exec->vm().heap);
if (tryBuildGetByIDList(exec, baseValue, propertyName, slot, stubInfo) == GiveUpOnCache)
repatchCall(exec->codeBlock(), stubInfo.callReturnLocation, operationGetById);
}
static V_JITOperation_ESsiJJI appropriateGenericPutByIdFunction(const PutPropertySlot &slot, PutKind putKind)
{
if (slot.isStrictMode()) {
if (putKind == Direct)
return operationPutByIdDirectStrict;
return operationPutByIdStrict;
}
if (putKind == Direct)
return operationPutByIdDirectNonStrict;
return operationPutByIdNonStrict;
}
static V_JITOperation_ESsiJJI appropriateListBuildingPutByIdFunction(const PutPropertySlot &slot, PutKind putKind)
{
if (slot.isStrictMode()) {
if (putKind == Direct)
return operationPutByIdDirectStrictBuildList;
return operationPutByIdStrictBuildList;
}
if (putKind == Direct)
return operationPutByIdDirectNonStrictBuildList;
return operationPutByIdNonStrictBuildList;
}
static void emitPutReplaceStub(
ExecState* exec,
JSValue,
const Identifier&,
const PutPropertySlot& slot,
StructureStubInfo& stubInfo,
PutKind,
Structure* structure,
CodeLocationLabel failureLabel,
RefPtr<JITStubRoutine>& stubRoutine)
{
VM* vm = &exec->vm();
GPRReg baseGPR = static_cast<GPRReg>(stubInfo.patch.baseGPR);
#if USE(JSVALUE32_64)
GPRReg valueTagGPR = static_cast<GPRReg>(stubInfo.patch.valueTagGPR);
#endif
GPRReg valueGPR = static_cast<GPRReg>(stubInfo.patch.valueGPR);
ScratchRegisterAllocator allocator(stubInfo.patch.usedRegisters);
allocator.lock(baseGPR);
#if USE(JSVALUE32_64)
allocator.lock(valueTagGPR);
#endif
allocator.lock(valueGPR);
GPRReg scratchGPR1 = allocator.allocateScratchGPR();
CCallHelpers stubJit(vm, exec->codeBlock());
allocator.preserveReusedRegistersByPushing(stubJit);
MacroAssembler::Jump badStructure = branchStructure(stubJit,
MacroAssembler::NotEqual,
MacroAssembler::Address(baseGPR, JSCell::structureIDOffset()),
structure);
#if USE(JSVALUE64)
if (isInlineOffset(slot.cachedOffset()))
stubJit.store64(valueGPR, MacroAssembler::Address(baseGPR, JSObject::offsetOfInlineStorage() + offsetInInlineStorage(slot.cachedOffset()) * sizeof(JSValue)));
else {
stubJit.loadPtr(MacroAssembler::Address(baseGPR, JSObject::butterflyOffset()), scratchGPR1);
stubJit.store64(valueGPR, MacroAssembler::Address(scratchGPR1, offsetInButterfly(slot.cachedOffset()) * sizeof(JSValue)));
}
#elif USE(JSVALUE32_64)
if (isInlineOffset(slot.cachedOffset())) {
stubJit.store32(valueGPR, MacroAssembler::Address(baseGPR, JSObject::offsetOfInlineStorage() + offsetInInlineStorage(slot.cachedOffset()) * sizeof(JSValue) + OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.payload)));
stubJit.store32(valueTagGPR, MacroAssembler::Address(baseGPR, JSObject::offsetOfInlineStorage() + offsetInInlineStorage(slot.cachedOffset()) * sizeof(JSValue) + OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.tag)));
} else {
stubJit.loadPtr(MacroAssembler::Address(baseGPR, JSObject::butterflyOffset()), scratchGPR1);
stubJit.store32(valueGPR, MacroAssembler::Address(scratchGPR1, offsetInButterfly(slot.cachedOffset()) * sizeof(JSValue) + OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.payload)));
stubJit.store32(valueTagGPR, MacroAssembler::Address(scratchGPR1, offsetInButterfly(slot.cachedOffset()) * sizeof(JSValue) + OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.tag)));
}
#endif
MacroAssembler::Jump success;
MacroAssembler::Jump failure;
if (allocator.didReuseRegisters()) {
allocator.restoreReusedRegistersByPopping(stubJit);
success = stubJit.jump();
badStructure.link(&stubJit);
allocator.restoreReusedRegistersByPopping(stubJit);
failure = stubJit.jump();
} else {
success = stubJit.jump();
failure = badStructure;
}
LinkBuffer patchBuffer(*vm, stubJit, exec->codeBlock());
patchBuffer.link(success, stubInfo.callReturnLocation.labelAtOffset(stubInfo.patch.deltaCallToDone));
patchBuffer.link(failure, failureLabel);
stubRoutine = FINALIZE_CODE_FOR_STUB(
exec->codeBlock(), patchBuffer,
("PutById replace stub for %s, return point %p",
toCString(*exec->codeBlock()).data(), stubInfo.callReturnLocation.labelAtOffset(
stubInfo.patch.deltaCallToDone).executableAddress()));
}
static void emitPutTransitionStub(
ExecState* exec,
JSValue,
const Identifier&,
const PutPropertySlot& slot,
StructureStubInfo& stubInfo,
PutKind putKind,
Structure* structure,
Structure* oldStructure,
StructureChain* prototypeChain,
CodeLocationLabel failureLabel,
RefPtr<JITStubRoutine>& stubRoutine)
{
VM* vm = &exec->vm();
GPRReg baseGPR = static_cast<GPRReg>(stubInfo.patch.baseGPR);
#if USE(JSVALUE32_64)
GPRReg valueTagGPR = static_cast<GPRReg>(stubInfo.patch.valueTagGPR);
#endif
GPRReg valueGPR = static_cast<GPRReg>(stubInfo.patch.valueGPR);
ScratchRegisterAllocator allocator(stubInfo.patch.usedRegisters);
allocator.lock(baseGPR);
#if USE(JSVALUE32_64)
allocator.lock(valueTagGPR);
#endif
allocator.lock(valueGPR);
CCallHelpers stubJit(vm);
bool needThirdScratch = false;
if (structure->outOfLineCapacity() != oldStructure->outOfLineCapacity()
&& oldStructure->outOfLineCapacity()) {
needThirdScratch = true;