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DFGRepatch.cpp
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1310 lines (1093 loc) · 60.2 KB
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/*
* Copyright (C) 2011, 2012 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 "DFGRepatch.h"
#if ENABLE(DFG_JIT)
#include "DFGCCallHelpers.h"
#include "DFGScratchRegisterAllocator.h"
#include "DFGSpeculativeJIT.h"
#include "DFGThunks.h"
#include "GCAwareJITStubRoutine.h"
#include "LinkBuffer.h"
#include "Operations.h"
#include "PolymorphicPutByIdList.h"
#include "RepatchBuffer.h"
#include "StructureRareDataInlines.h"
#include <wtf/StringPrintStream.h>
namespace JSC { namespace DFG {
static void dfgRepatchCall(CodeBlock* codeblock, CodeLocationCall call, FunctionPtr newCalleeFunction)
{
RepatchBuffer repatchBuffer(codeblock);
repatchBuffer.relink(call, newCalleeFunction);
}
static void dfgRepatchByIdSelfAccess(CodeBlock* codeBlock, StructureStubInfo& stubInfo, Structure* structure, PropertyOffset offset, const FunctionPtr &slowPathFunction, bool compact)
{
RepatchBuffer repatchBuffer(codeBlock);
// Only optimize once!
repatchBuffer.relink(stubInfo.callReturnLocation, slowPathFunction);
// Patch the structure check & the offset of the load.
repatchBuffer.repatch(stubInfo.callReturnLocation.dataLabelPtrAtOffset(-(intptr_t)stubInfo.patch.dfg.deltaCheckImmToCall), structure);
repatchBuffer.setLoadInstructionIsActive(stubInfo.callReturnLocation.convertibleLoadAtOffset(stubInfo.patch.dfg.deltaCallToStorageLoad), isOutOfLineOffset(offset));
#if USE(JSVALUE64)
if (compact)
repatchBuffer.repatch(stubInfo.callReturnLocation.dataLabelCompactAtOffset(stubInfo.patch.dfg.deltaCallToLoadOrStore), offsetRelativeToPatchedStorage(offset));
else
repatchBuffer.repatch(stubInfo.callReturnLocation.dataLabel32AtOffset(stubInfo.patch.dfg.deltaCallToLoadOrStore), offsetRelativeToPatchedStorage(offset));
#elif USE(JSVALUE32_64)
if (compact) {
repatchBuffer.repatch(stubInfo.callReturnLocation.dataLabelCompactAtOffset(stubInfo.patch.dfg.deltaCallToTagLoadOrStore), offsetRelativeToPatchedStorage(offset) + OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.tag));
repatchBuffer.repatch(stubInfo.callReturnLocation.dataLabelCompactAtOffset(stubInfo.patch.dfg.deltaCallToPayloadLoadOrStore), offsetRelativeToPatchedStorage(offset) + OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.payload));
} else {
repatchBuffer.repatch(stubInfo.callReturnLocation.dataLabel32AtOffset(stubInfo.patch.dfg.deltaCallToTagLoadOrStore), offsetRelativeToPatchedStorage(offset) + OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.tag));
repatchBuffer.repatch(stubInfo.callReturnLocation.dataLabel32AtOffset(stubInfo.patch.dfg.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 DFG_ENABLE(JIT_ASSERT)
// 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 = jit.branchPtr(
MacroAssembler::Equal,
MacroAssembler::Address(scratchGPR, JSCell::structureOffset()),
MacroAssembler::TrustedImmPtr(structure));
jit.breakpoint();
ok.link(&jit);
#endif
return;
}
jit.move(MacroAssembler::TrustedImmPtr(object), scratchGPR);
failureCases.append(
jit.branchPtr(
MacroAssembler::NotEqual,
MacroAssembler::Address(scratchGPR, JSCell::structureOffset()),
MacroAssembler::TrustedImmPtr(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::canJumpReplacePatchableBranchPtrWithPatch()) {
repatchBuffer.replaceWithJump(
RepatchBuffer::startOfPatchableBranchPtrWithPatchOnAddress(
stubInfo.callReturnLocation.dataLabelPtrAtOffset(
-(intptr_t)stubInfo.patch.dfg.deltaCheckImmToCall)),
CodeLocationLabel(target));
return;
}
repatchBuffer.relink(
stubInfo.callReturnLocation.jumpAtOffset(
stubInfo.patch.dfg.deltaCallToStructCheck),
CodeLocationLabel(target));
}
static void emitRestoreScratch(MacroAssembler& stubJit, bool needToRestoreScratch, GPRReg scratchGPR, MacroAssembler::Jump& success, MacroAssembler::Jump& fail, MacroAssembler::JumpList failureCases)
{
if (needToRestoreScratch) {
stubJit.pop(scratchGPR);
success = stubJit.jump();
// link failure cases here, so we can pop scratchGPR, and then jump back.
failureCases.link(&stubJit);
stubJit.pop(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.dfg.deltaCallToDone), stubInfo.callReturnLocation.labelAtOffset(stubInfo.patch.dfg.deltaCallToSlowCase));
}
static void generateProtoChainAccessStub(ExecState* exec, StructureStubInfo& stubInfo, StructureChain* chain, size_t count, PropertyOffset offset, Structure* structure, CodeLocationLabel successLabel, CodeLocationLabel slowCaseLabel, RefPtr<JITStubRoutine>& stubRoutine)
{
VM* vm = &exec->vm();
MacroAssembler stubJit;
GPRReg baseGPR = static_cast<GPRReg>(stubInfo.patch.dfg.baseGPR);
#if USE(JSVALUE32_64)
GPRReg resultTagGPR = static_cast<GPRReg>(stubInfo.patch.dfg.valueTagGPR);
#endif
GPRReg resultGPR = static_cast<GPRReg>(stubInfo.patch.dfg.valueGPR);
GPRReg scratchGPR = RegisterSet(stubInfo.patch.dfg.usedRegisters).getFreeGPR();
bool needToRestoreScratch = false;
if (scratchGPR == InvalidGPRReg) {
#if USE(JSVALUE64)
scratchGPR = SpeculativeJIT::selectScratchGPR(baseGPR, resultGPR);
#else
scratchGPR = SpeculativeJIT::selectScratchGPR(baseGPR, resultGPR, resultTagGPR);
#endif
stubJit.push(scratchGPR);
needToRestoreScratch = true;
}
MacroAssembler::JumpList failureCases;
failureCases.append(stubJit.branchPtr(MacroAssembler::NotEqual, MacroAssembler::Address(baseGPR, JSCell::structureOffset()), MacroAssembler::TrustedImmPtr(structure)));
Structure* currStructure = structure;
WriteBarrier<Structure>* it = chain->head();
JSObject* protoObject = 0;
for (unsigned i = 0; i < count; ++i, ++it) {
protoObject = asObject(currStructure->prototypeForLookup(exec));
addStructureTransitionCheck(
protoObject, protoObject->structure(), exec->codeBlock(), stubInfo, stubJit,
failureCases, scratchGPR);
currStructure = it->get();
}
if (isInlineOffset(offset)) {
#if USE(JSVALUE64)
stubJit.load64(protoObject->locationForOffset(offset), resultGPR);
#elif USE(JSVALUE32_64)
stubJit.move(MacroAssembler::TrustedImmPtr(protoObject->locationForOffset(offset)), resultGPR);
stubJit.load32(MacroAssembler::Address(resultGPR, OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.tag)), resultTagGPR);
stubJit.load32(MacroAssembler::Address(resultGPR, OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.payload)), resultGPR);
#endif
} else {
stubJit.loadPtr(protoObject->butterflyAddress(), resultGPR);
#if USE(JSVALUE64)
stubJit.load64(MacroAssembler::Address(resultGPR, offsetInButterfly(offset) * sizeof(WriteBarrier<Unknown>)), resultGPR);
#elif USE(JSVALUE32_64)
stubJit.load32(MacroAssembler::Address(resultGPR, offsetInButterfly(offset) * sizeof(WriteBarrier<Unknown>) + OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.tag)), resultTagGPR);
stubJit.load32(MacroAssembler::Address(resultGPR, offsetInButterfly(offset) * sizeof(WriteBarrier<Unknown>) + OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.payload)), resultGPR);
#endif
}
MacroAssembler::Jump success, fail;
emitRestoreScratch(stubJit, needToRestoreScratch, scratchGPR, success, fail, failureCases);
LinkBuffer patchBuffer(*vm, &stubJit, exec->codeBlock());
linkRestoreScratch(patchBuffer, needToRestoreScratch, success, fail, failureCases, successLabel, slowCaseLabel);
stubRoutine = FINALIZE_CODE_FOR_DFG_STUB(
patchBuffer,
("DFG prototype chain access stub for %s, return point %p",
toCString(*exec->codeBlock()).data(), successLabel.executableAddress()));
}
static bool tryCacheGetByID(ExecState* exec, JSValue baseValue, const Identifier& propertyName, const PropertySlot& slot, StructureStubInfo& stubInfo)
{
// 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) && propertyName == exec->propertyNames().length) {
GPRReg baseGPR = static_cast<GPRReg>(stubInfo.patch.dfg.baseGPR);
#if USE(JSVALUE32_64)
GPRReg resultTagGPR = static_cast<GPRReg>(stubInfo.patch.dfg.valueTagGPR);
#endif
GPRReg resultGPR = static_cast<GPRReg>(stubInfo.patch.dfg.valueGPR);
GPRReg scratchGPR = RegisterSet(stubInfo.patch.dfg.usedRegisters).getFreeGPR();
bool needToRestoreScratch = false;
MacroAssembler stubJit;
if (scratchGPR == InvalidGPRReg) {
#if USE(JSVALUE64)
scratchGPR = SpeculativeJIT::selectScratchGPR(baseGPR, resultGPR);
#else
scratchGPR = SpeculativeJIT::selectScratchGPR(baseGPR, resultGPR, resultTagGPR);
#endif
stubJit.push(scratchGPR);
needToRestoreScratch = true;
}
MacroAssembler::JumpList failureCases;
stubJit.loadPtr(MacroAssembler::Address(baseGPR, JSCell::structureOffset()), scratchGPR);
stubJit.load8(MacroAssembler::Address(scratchGPR, Structure::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)));
#if USE(JSVALUE64)
stubJit.or64(GPRInfo::tagTypeNumberRegister, scratchGPR, resultGPR);
#elif USE(JSVALUE32_64)
stubJit.move(scratchGPR, resultGPR);
stubJit.move(JITCompiler::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_DFG_STUB(
patchBuffer,
("DFG GetById array length stub for %s, return point %p",
toCString(*exec->codeBlock()).data(), stubInfo.callReturnLocation.labelAtOffset(
stubInfo.patch.dfg.deltaCallToDone).executableAddress()));
RepatchBuffer repatchBuffer(codeBlock);
replaceWithJump(repatchBuffer, stubInfo, stubInfo.stubRoutine->code().code());
repatchBuffer.relink(stubInfo.callReturnLocation, operationGetById);
return true;
}
// FIXME: should support length access for String.
// FIXME: Cache property access for immediates.
if (!baseValue.isCell())
return false;
JSCell* baseCell = baseValue.asCell();
Structure* structure = baseCell->structure();
if (!slot.isCacheable())
return false;
if (!structure->propertyAccessesAreCacheable())
return false;
// Optimize self access.
if (slot.slotBase() == baseValue) {
if ((slot.cachedPropertyType() != PropertySlot::Value)
|| !MacroAssembler::isCompactPtrAlignedAddressOffset(maxOffsetRelativeToPatchedStorage(slot.cachedOffset()))) {
dfgRepatchCall(codeBlock, stubInfo.callReturnLocation, operationGetByIdBuildList);
return true;
}
dfgRepatchByIdSelfAccess(codeBlock, stubInfo, structure, slot.cachedOffset(), operationGetByIdBuildList, true);
stubInfo.initGetByIdSelf(*vm, codeBlock->ownerExecutable(), structure);
return true;
}
if (structure->isDictionary())
return false;
// FIXME: optimize getters and setters
if (slot.cachedPropertyType() != PropertySlot::Value)
return false;
PropertyOffset offset = slot.cachedOffset();
size_t count = normalizePrototypeChainForChainAccess(exec, baseValue, slot.slotBase(), propertyName, offset);
if (count == InvalidPrototypeChain)
return false;
StructureChain* prototypeChain = structure->prototypeChain(exec);
ASSERT(slot.slotBase().isObject());
generateProtoChainAccessStub(exec, stubInfo, prototypeChain, count, offset, structure, stubInfo.callReturnLocation.labelAtOffset(stubInfo.patch.dfg.deltaCallToDone), stubInfo.callReturnLocation.labelAtOffset(stubInfo.patch.dfg.deltaCallToSlowCase), stubInfo.stubRoutine);
RepatchBuffer repatchBuffer(codeBlock);
replaceWithJump(repatchBuffer, stubInfo, stubInfo.stubRoutine->code().code());
repatchBuffer.relink(stubInfo.callReturnLocation, operationGetByIdProtoBuildList);
stubInfo.initGetByIdChain(*vm, codeBlock->ownerExecutable(), structure, prototypeChain, count, true);
return true;
}
void dfgRepatchGetByID(ExecState* exec, JSValue baseValue, const Identifier& propertyName, const PropertySlot& slot, StructureStubInfo& stubInfo)
{
bool cached = tryCacheGetByID(exec, baseValue, propertyName, slot, stubInfo);
if (!cached)
dfgRepatchCall(exec->codeBlock(), stubInfo.callReturnLocation, operationGetById);
}
static bool tryBuildGetByIDList(ExecState* exec, JSValue baseValue, const Identifier& ident, const PropertySlot& slot, StructureStubInfo& stubInfo)
{
if (!baseValue.isCell()
|| !slot.isCacheable()
|| baseValue.asCell()->structure()->isUncacheableDictionary()
|| slot.slotBase() != baseValue)
return false;
if (!stubInfo.patch.dfg.registersFlushed) {
// 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.cachedPropertyType() != PropertySlot::Value)
return false;
}
CodeBlock* codeBlock = exec->codeBlock();
JSCell* baseCell = baseValue.asCell();
Structure* structure = baseCell->structure();
VM* vm = &exec->vm();
ASSERT(slot.slotBase().isObject());
PolymorphicAccessStructureList* polymorphicStructureList;
int listIndex;
if (stubInfo.accessType == access_unset) {
ASSERT(!stubInfo.stubRoutine);
polymorphicStructureList = new PolymorphicAccessStructureList();
stubInfo.initGetByIdSelfList(polymorphicStructureList, 0);
listIndex = 0;
} else if (stubInfo.accessType == access_get_by_id_self) {
ASSERT(!stubInfo.stubRoutine);
polymorphicStructureList = new PolymorphicAccessStructureList(*vm, codeBlock->ownerExecutable(), JITStubRoutine::createSelfManagedRoutine(stubInfo.callReturnLocation.labelAtOffset(stubInfo.patch.dfg.deltaCallToSlowCase)), stubInfo.u.getByIdSelf.baseObjectStructure.get(), true);
stubInfo.initGetByIdSelfList(polymorphicStructureList, 1);
listIndex = 1;
} else {
polymorphicStructureList = stubInfo.u.getByIdSelfList.structureList;
listIndex = stubInfo.u.getByIdSelfList.listSize;
}
if (listIndex < POLYMORPHIC_LIST_CACHE_SIZE) {
stubInfo.u.getByIdSelfList.listSize++;
GPRReg baseGPR = static_cast<GPRReg>(stubInfo.patch.dfg.baseGPR);
#if USE(JSVALUE32_64)
GPRReg resultTagGPR = static_cast<GPRReg>(stubInfo.patch.dfg.valueTagGPR);
#endif
GPRReg resultGPR = static_cast<GPRReg>(stubInfo.patch.dfg.valueGPR);
GPRReg scratchGPR = RegisterSet(stubInfo.patch.dfg.usedRegisters).getFreeGPR();
CCallHelpers stubJit(vm, codeBlock);
MacroAssembler::Jump wrongStruct = stubJit.branchPtr(MacroAssembler::NotEqual, MacroAssembler::Address(baseGPR, JSCell::structureOffset()), MacroAssembler::TrustedImmPtr(structure));
// The strategy we use for stubs is as follows:
// 1) Call DFG helper that calls the getter.
// 2) Check if there was an exception, and if there was, call yet another
// helper.
bool isDirect = false;
MacroAssembler::Call operationCall;
MacroAssembler::Call handlerCall;
FunctionPtr operationFunction;
MacroAssembler::Jump success;
if (slot.cachedPropertyType() == PropertySlot::Getter
|| slot.cachedPropertyType() == PropertySlot::Custom) {
if (slot.cachedPropertyType() == PropertySlot::Getter) {
ASSERT(scratchGPR != InvalidGPRReg);
ASSERT(baseGPR != scratchGPR);
if (isInlineOffset(slot.cachedOffset())) {
#if USE(JSVALUE64)
stubJit.load64(MacroAssembler::Address(baseGPR, offsetRelativeToBase(slot.cachedOffset())), scratchGPR);
#else
stubJit.load32(MacroAssembler::Address(baseGPR, offsetRelativeToBase(slot.cachedOffset())), scratchGPR);
#endif
} else {
stubJit.loadPtr(MacroAssembler::Address(baseGPR, JSObject::butterflyOffset()), scratchGPR);
#if USE(JSVALUE64)
stubJit.load64(MacroAssembler::Address(scratchGPR, offsetRelativeToBase(slot.cachedOffset())), scratchGPR);
#else
stubJit.load32(MacroAssembler::Address(scratchGPR, offsetRelativeToBase(slot.cachedOffset())), scratchGPR);
#endif
}
stubJit.setupArgumentsWithExecState(baseGPR, scratchGPR);
operationFunction = operationCallGetter;
} else {
stubJit.setupArgumentsWithExecState(
baseGPR,
MacroAssembler::TrustedImmPtr(FunctionPtr(slot.customGetter()).executableAddress()),
MacroAssembler::TrustedImmPtr(const_cast<Identifier*>(&ident)));
operationFunction = operationCallCustomGetter;
}
// 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->codeOriginIndexForDFG()),
CCallHelpers::tagFor(static_cast<VirtualRegister>(JSStack::ArgumentCount)));
operationCall = stubJit.call();
#if USE(JSVALUE64)
stubJit.move(GPRInfo::returnValueGPR, resultGPR);
#else
stubJit.setupResults(resultGPR, resultTagGPR);
#endif
success = stubJit.emitExceptionCheck(CCallHelpers::InvertedExceptionCheck);
stubJit.setupArgumentsWithExecState(
MacroAssembler::TrustedImmPtr(&stubInfo));
handlerCall = stubJit.call();
stubJit.jump(GPRInfo::returnValueGPR2);
} else {
if (isInlineOffset(slot.cachedOffset())) {
#if USE(JSVALUE64)
stubJit.load64(MacroAssembler::Address(baseGPR, offsetRelativeToBase(slot.cachedOffset())), resultGPR);
#else
if (baseGPR == resultTagGPR) {
stubJit.load32(MacroAssembler::Address(baseGPR, offsetRelativeToBase(slot.cachedOffset()) + OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.payload)), resultGPR);
stubJit.load32(MacroAssembler::Address(baseGPR, offsetRelativeToBase(slot.cachedOffset()) + OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.tag)), resultTagGPR);
} else {
stubJit.load32(MacroAssembler::Address(baseGPR, offsetRelativeToBase(slot.cachedOffset()) + OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.tag)), resultTagGPR);
stubJit.load32(MacroAssembler::Address(baseGPR, offsetRelativeToBase(slot.cachedOffset()) + OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.payload)), resultGPR);
}
#endif
} else {
stubJit.loadPtr(MacroAssembler::Address(baseGPR, JSObject::butterflyOffset()), resultGPR);
#if USE(JSVALUE64)
stubJit.load64(MacroAssembler::Address(resultGPR, offsetRelativeToBase(slot.cachedOffset())), resultGPR);
#else
stubJit.load32(MacroAssembler::Address(resultGPR, offsetRelativeToBase(slot.cachedOffset()) + OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.tag)), resultTagGPR);
stubJit.load32(MacroAssembler::Address(resultGPR, offsetRelativeToBase(slot.cachedOffset()) + OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.payload)), resultGPR);
#endif
}
success = stubJit.jump();
isDirect = true;
}
LinkBuffer patchBuffer(*vm, &stubJit, codeBlock);
CodeLocationLabel lastProtoBegin;
if (listIndex)
lastProtoBegin = CodeLocationLabel(polymorphicStructureList->list[listIndex - 1].stubRoutine->code().code());
else
lastProtoBegin = stubInfo.callReturnLocation.labelAtOffset(stubInfo.patch.dfg.deltaCallToSlowCase);
ASSERT(!!lastProtoBegin);
patchBuffer.link(wrongStruct, lastProtoBegin);
patchBuffer.link(success, stubInfo.callReturnLocation.labelAtOffset(stubInfo.patch.dfg.deltaCallToDone));
if (!isDirect) {
patchBuffer.link(operationCall, operationFunction);
patchBuffer.link(handlerCall, lookupExceptionHandlerInStub);
}
RefPtr<JITStubRoutine> stubRoutine =
createJITStubRoutine(
FINALIZE_DFG_CODE(
patchBuffer,
("DFG GetById polymorphic list access for %s, return point %p",
toCString(*exec->codeBlock()).data(), stubInfo.callReturnLocation.labelAtOffset(
stubInfo.patch.dfg.deltaCallToDone).executableAddress())),
*vm,
codeBlock->ownerExecutable(),
slot.cachedPropertyType() == PropertySlot::Getter
|| slot.cachedPropertyType() == PropertySlot::Custom);
polymorphicStructureList->list[listIndex].set(*vm, codeBlock->ownerExecutable(), stubRoutine, structure, isDirect);
RepatchBuffer repatchBuffer(codeBlock);
repatchBuffer.relink(
stubInfo.callReturnLocation.jumpAtOffset(
stubInfo.patch.dfg.deltaCallToStructCheck),
CodeLocationLabel(stubRoutine->code().code()));
if (listIndex < (POLYMORPHIC_LIST_CACHE_SIZE - 1))
return true;
}
return false;
}
void dfgBuildGetByIDList(ExecState* exec, JSValue baseValue, const Identifier& propertyName, const PropertySlot& slot, StructureStubInfo& stubInfo)
{
bool dontChangeCall = tryBuildGetByIDList(exec, baseValue, propertyName, slot, stubInfo);
if (!dontChangeCall)
dfgRepatchCall(exec->codeBlock(), stubInfo.callReturnLocation, operationGetById);
}
static bool tryBuildGetByIDProtoList(ExecState* exec, JSValue baseValue, const Identifier& propertyName, const PropertySlot& slot, StructureStubInfo& stubInfo)
{
if (!baseValue.isCell()
|| !slot.isCacheable()
|| baseValue.asCell()->structure()->isDictionary()
|| baseValue.asCell()->structure()->typeInfo().prohibitsPropertyCaching()
|| slot.slotBase() == baseValue
|| slot.cachedPropertyType() != PropertySlot::Value)
return false;
ASSERT(slot.slotBase().isObject());
PropertyOffset offset = slot.cachedOffset();
size_t count = normalizePrototypeChainForChainAccess(exec, baseValue, slot.slotBase(), propertyName, offset);
if (count == InvalidPrototypeChain)
return false;
Structure* structure = baseValue.asCell()->structure();
StructureChain* prototypeChain = structure->prototypeChain(exec);
CodeBlock* codeBlock = exec->codeBlock();
VM* vm = &exec->vm();
PolymorphicAccessStructureList* polymorphicStructureList;
int listIndex = 1;
if (stubInfo.accessType == access_get_by_id_chain) {
ASSERT(!!stubInfo.stubRoutine);
polymorphicStructureList = new PolymorphicAccessStructureList(*vm, codeBlock->ownerExecutable(), stubInfo.stubRoutine, stubInfo.u.getByIdChain.baseObjectStructure.get(), stubInfo.u.getByIdChain.chain.get(), true);
stubInfo.stubRoutine.clear();
stubInfo.initGetByIdProtoList(polymorphicStructureList, 1);
} else {
ASSERT(stubInfo.accessType == access_get_by_id_proto_list);
polymorphicStructureList = stubInfo.u.getByIdProtoList.structureList;
listIndex = stubInfo.u.getByIdProtoList.listSize;
}
if (listIndex < POLYMORPHIC_LIST_CACHE_SIZE) {
stubInfo.u.getByIdProtoList.listSize++;
CodeLocationLabel lastProtoBegin = CodeLocationLabel(polymorphicStructureList->list[listIndex - 1].stubRoutine->code().code());
ASSERT(!!lastProtoBegin);
RefPtr<JITStubRoutine> stubRoutine;
generateProtoChainAccessStub(exec, stubInfo, prototypeChain, count, offset, structure, stubInfo.callReturnLocation.labelAtOffset(stubInfo.patch.dfg.deltaCallToDone), lastProtoBegin, stubRoutine);
polymorphicStructureList->list[listIndex].set(*vm, codeBlock->ownerExecutable(), stubRoutine, structure, true);
RepatchBuffer repatchBuffer(codeBlock);
replaceWithJump(repatchBuffer, stubInfo, stubRoutine->code().code());
if (listIndex < (POLYMORPHIC_LIST_CACHE_SIZE - 1))
return true;
}
return false;
}
void dfgBuildGetByIDProtoList(ExecState* exec, JSValue baseValue, const Identifier& propertyName, const PropertySlot& slot, StructureStubInfo& stubInfo)
{
bool dontChangeCall = tryBuildGetByIDProtoList(exec, baseValue, propertyName, slot, stubInfo);
if (!dontChangeCall)
dfgRepatchCall(exec->codeBlock(), stubInfo.callReturnLocation, operationGetById);
}
static V_DFGOperation_EJCI 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_DFGOperation_EJCI 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.dfg.baseGPR);
#if USE(JSVALUE32_64)
GPRReg valueTagGPR = static_cast<GPRReg>(stubInfo.patch.dfg.valueTagGPR);
#endif
GPRReg valueGPR = static_cast<GPRReg>(stubInfo.patch.dfg.valueGPR);
GPRReg scratchGPR = RegisterSet(stubInfo.patch.dfg.usedRegisters).getFreeGPR();
bool needToRestoreScratch = false;
#if ENABLE(WRITE_BARRIER_PROFILING)
GPRReg scratchGPR2;
const bool writeBarrierNeeded = true;
#else
const bool writeBarrierNeeded = false;
#endif
MacroAssembler stubJit;
if (scratchGPR == InvalidGPRReg && (writeBarrierNeeded || isOutOfLineOffset(slot.cachedOffset()))) {
#if USE(JSVALUE64)
scratchGPR = SpeculativeJIT::selectScratchGPR(baseGPR, valueGPR);
#else
scratchGPR = SpeculativeJIT::selectScratchGPR(baseGPR, valueGPR, valueTagGPR);
#endif
needToRestoreScratch = true;
stubJit.push(scratchGPR);
}
MacroAssembler::Jump badStructure = stubJit.branchPtr(
MacroAssembler::NotEqual,
MacroAssembler::Address(baseGPR, JSCell::structureOffset()),
MacroAssembler::TrustedImmPtr(structure));
#if ENABLE(WRITE_BARRIER_PROFILING)
#if USE(JSVALUE64)
scratchGPR2 = SpeculativeJIT::selectScratchGPR(baseGPR, valueGPR, scratchGPR);
#else
scratchGPR2 = SpeculativeJIT::selectScratchGPR(baseGPR, valueGPR, valueTagGPR, scratchGPR);
#endif
stubJit.push(scratchGPR2);
SpeculativeJIT::writeBarrier(stubJit, baseGPR, scratchGPR, scratchGPR2, WriteBarrierForPropertyAccess);
stubJit.pop(scratchGPR2);
#endif
#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()), scratchGPR);
stubJit.store64(valueGPR, MacroAssembler::Address(scratchGPR, 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()), scratchGPR);
stubJit.store32(valueGPR, MacroAssembler::Address(scratchGPR, offsetInButterfly(slot.cachedOffset()) * sizeof(JSValue) + OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.payload)));
stubJit.store32(valueTagGPR, MacroAssembler::Address(scratchGPR, offsetInButterfly(slot.cachedOffset()) * sizeof(JSValue) + OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.tag)));
}
#endif
MacroAssembler::Jump success;
MacroAssembler::Jump failure;
if (needToRestoreScratch) {
stubJit.pop(scratchGPR);
success = stubJit.jump();
badStructure.link(&stubJit);
stubJit.pop(scratchGPR);
failure = stubJit.jump();
} else {
success = stubJit.jump();
failure = badStructure;
}
LinkBuffer patchBuffer(*vm, &stubJit, exec->codeBlock());
patchBuffer.link(success, stubInfo.callReturnLocation.labelAtOffset(stubInfo.patch.dfg.deltaCallToDone));
patchBuffer.link(failure, failureLabel);
stubRoutine = FINALIZE_CODE_FOR_DFG_STUB(
patchBuffer,
("DFG PutById replace stub for %s, return point %p",
toCString(*exec->codeBlock()).data(), stubInfo.callReturnLocation.labelAtOffset(
stubInfo.patch.dfg.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.dfg.baseGPR);
#if USE(JSVALUE32_64)
GPRReg valueTagGPR = static_cast<GPRReg>(stubInfo.patch.dfg.valueTagGPR);
#endif
GPRReg valueGPR = static_cast<GPRReg>(stubInfo.patch.dfg.valueGPR);
ScratchRegisterAllocator allocator(stubInfo.patch.dfg.usedRegisters);
allocator.lock(baseGPR);
#if USE(JSVALUE32_64)
allocator.lock(valueTagGPR);
#endif
allocator.lock(valueGPR);
CCallHelpers stubJit(vm);
GPRReg scratchGPR1 = allocator.allocateScratchGPR();
ASSERT(scratchGPR1 != baseGPR);
ASSERT(scratchGPR1 != valueGPR);
bool needSecondScratch = false;
bool needThirdScratch = false;
#if ENABLE(WRITE_BARRIER_PROFILING)
needSecondScratch = true;
#endif
if (structure->outOfLineCapacity() != oldStructure->outOfLineCapacity()
&& oldStructure->outOfLineCapacity()) {
needSecondScratch = true;
needThirdScratch = true;
}
GPRReg scratchGPR2;
if (needSecondScratch) {
scratchGPR2 = allocator.allocateScratchGPR();
ASSERT(scratchGPR2 != baseGPR);
ASSERT(scratchGPR2 != valueGPR);
ASSERT(scratchGPR2 != scratchGPR1);
} else
scratchGPR2 = InvalidGPRReg;
GPRReg scratchGPR3;
if (needThirdScratch) {
scratchGPR3 = allocator.allocateScratchGPR();
ASSERT(scratchGPR3 != baseGPR);
ASSERT(scratchGPR3 != valueGPR);
ASSERT(scratchGPR3 != scratchGPR1);
ASSERT(scratchGPR3 != scratchGPR2);
} else
scratchGPR3 = InvalidGPRReg;
allocator.preserveReusedRegistersByPushing(stubJit);
MacroAssembler::JumpList failureCases;
ASSERT(oldStructure->transitionWatchpointSetHasBeenInvalidated());
failureCases.append(stubJit.branchPtr(MacroAssembler::NotEqual, MacroAssembler::Address(baseGPR, JSCell::structureOffset()), MacroAssembler::TrustedImmPtr(oldStructure)));
addStructureTransitionCheck(
oldStructure->storedPrototype(), exec->codeBlock(), stubInfo, stubJit, failureCases,
scratchGPR1);
if (putKind == NotDirect) {
for (WriteBarrier<Structure>* it = prototypeChain->head(); *it; ++it) {
addStructureTransitionCheck(
(*it)->storedPrototype(), exec->codeBlock(), stubInfo, stubJit, failureCases,
scratchGPR1);
}
}
#if ENABLE(WRITE_BARRIER_PROFILING)
ASSERT(needSecondScratch);
ASSERT(scratchGPR2 != InvalidGPRReg);
// Must always emit this write barrier as the structure transition itself requires it
SpeculativeJIT::writeBarrier(stubJit, baseGPR, scratchGPR1, scratchGPR2, WriteBarrierForPropertyAccess);
#endif
MacroAssembler::JumpList slowPath;
bool scratchGPR1HasStorage = false;
if (structure->outOfLineCapacity() != oldStructure->outOfLineCapacity()) {
size_t newSize = structure->outOfLineCapacity() * sizeof(JSValue);
CopiedAllocator* copiedAllocator = &vm->heap.storageAllocator();
if (!oldStructure->outOfLineCapacity()) {
stubJit.loadPtr(&copiedAllocator->m_currentRemaining, scratchGPR1);
slowPath.append(stubJit.branchSubPtr(MacroAssembler::Signed, MacroAssembler::TrustedImm32(newSize), scratchGPR1));
stubJit.storePtr(scratchGPR1, &copiedAllocator->m_currentRemaining);
stubJit.negPtr(scratchGPR1);
stubJit.addPtr(MacroAssembler::AbsoluteAddress(&copiedAllocator->m_currentPayloadEnd), scratchGPR1);
stubJit.addPtr(MacroAssembler::TrustedImm32(sizeof(JSValue)), scratchGPR1);
} else {
size_t oldSize = oldStructure->outOfLineCapacity() * sizeof(JSValue);
ASSERT(newSize > oldSize);
stubJit.loadPtr(MacroAssembler::Address(baseGPR, JSObject::butterflyOffset()), scratchGPR3);
stubJit.loadPtr(&copiedAllocator->m_currentRemaining, scratchGPR1);
slowPath.append(stubJit.branchSubPtr(MacroAssembler::Signed, MacroAssembler::TrustedImm32(newSize), scratchGPR1));
stubJit.storePtr(scratchGPR1, &copiedAllocator->m_currentRemaining);
stubJit.negPtr(scratchGPR1);
stubJit.addPtr(MacroAssembler::AbsoluteAddress(&copiedAllocator->m_currentPayloadEnd), scratchGPR1);
stubJit.addPtr(MacroAssembler::TrustedImm32(sizeof(JSValue)), scratchGPR1);
// We have scratchGPR1 = new storage, scratchGPR3 = old storage, scratchGPR2 = available
for (ptrdiff_t offset = 0; offset < static_cast<ptrdiff_t>(oldSize); offset += sizeof(void*)) {
stubJit.loadPtr(MacroAssembler::Address(scratchGPR3, -(offset + sizeof(JSValue) + sizeof(void*))), scratchGPR2);
stubJit.storePtr(scratchGPR2, MacroAssembler::Address(scratchGPR1, -(offset + sizeof(JSValue) + sizeof(void*))));
}
}
stubJit.storePtr(scratchGPR1, MacroAssembler::Address(baseGPR, JSObject::butterflyOffset()));
scratchGPR1HasStorage = true;
}
stubJit.storePtr(MacroAssembler::TrustedImmPtr(structure), MacroAssembler::Address(baseGPR, JSCell::structureOffset()));
#if USE(JSVALUE64)
if (isInlineOffset(slot.cachedOffset()))
stubJit.store64(valueGPR, MacroAssembler::Address(baseGPR, JSObject::offsetOfInlineStorage() + offsetInInlineStorage(slot.cachedOffset()) * sizeof(JSValue)));
else {
if (!scratchGPR1HasStorage)
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 {
if (!scratchGPR1HasStorage)
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();
failureCases.link(&stubJit);
allocator.restoreReusedRegistersByPopping(stubJit);
failure = stubJit.jump();
} else
success = stubJit.jump();
MacroAssembler::Call operationCall;
MacroAssembler::Jump successInSlowPath;
if (structure->outOfLineCapacity() != oldStructure->outOfLineCapacity()) {
slowPath.link(&stubJit);
allocator.restoreReusedRegistersByPopping(stubJit);
ScratchBuffer* scratchBuffer = vm->scratchBufferForSize(allocator.desiredScratchBufferSize());
allocator.preserveUsedRegistersToScratchBuffer(stubJit, scratchBuffer, scratchGPR1);
#if USE(JSVALUE64)
stubJit.setupArgumentsWithExecState(baseGPR, MacroAssembler::TrustedImmPtr(structure), MacroAssembler::TrustedImm32(slot.cachedOffset()), valueGPR);
#else
stubJit.setupArgumentsWithExecState(baseGPR, MacroAssembler::TrustedImmPtr(structure), MacroAssembler::TrustedImm32(slot.cachedOffset()), valueGPR, valueTagGPR);
#endif
operationCall = stubJit.call();
allocator.restoreUsedRegistersFromScratchBuffer(stubJit, scratchBuffer, scratchGPR1);
successInSlowPath = stubJit.jump();
}
LinkBuffer patchBuffer(*vm, &stubJit, exec->codeBlock());
patchBuffer.link(success, stubInfo.callReturnLocation.labelAtOffset(stubInfo.patch.dfg.deltaCallToDone));
if (allocator.didReuseRegisters())
patchBuffer.link(failure, failureLabel);
else
patchBuffer.link(failureCases, failureLabel);
if (structure->outOfLineCapacity() != oldStructure->outOfLineCapacity()) {
patchBuffer.link(operationCall, operationReallocateStorageAndFinishPut);
patchBuffer.link(successInSlowPath, stubInfo.callReturnLocation.labelAtOffset(stubInfo.patch.dfg.deltaCallToDone));
}
stubRoutine =
createJITStubRoutine(
FINALIZE_DFG_CODE(
patchBuffer,
("DFG PutById %stransition stub (%p -> %p) for %s, return point %p",
structure->outOfLineCapacity() != oldStructure->outOfLineCapacity() ? "reallocating " : "",
oldStructure, structure,
toCString(*exec->codeBlock()).data(), stubInfo.callReturnLocation.labelAtOffset(
stubInfo.patch.dfg.deltaCallToDone).executableAddress())),
*vm,
exec->codeBlock()->ownerExecutable(),
structure->outOfLineCapacity() != oldStructure->outOfLineCapacity(),
structure);
}
static bool tryCachePutByID(ExecState* exec, JSValue baseValue, const Identifier& ident, const PutPropertySlot& slot, StructureStubInfo& stubInfo, PutKind putKind)
{
CodeBlock* codeBlock = exec->codeBlock();
VM* vm = &exec->vm();
if (!baseValue.isCell())
return false;
JSCell* baseCell = baseValue.asCell();
Structure* structure = baseCell->structure();
Structure* oldStructure = structure->previousID();
if (!slot.isCacheable())
return false;
if (structure->isUncacheableDictionary())
return false;
// Optimize self access.
if (slot.base() == baseValue) {
if (slot.type() == PutPropertySlot::NewProperty) {
if (structure->isDictionary())
return false;
// Skip optimizing the case where we need a realloc, if we don't have
// enough registers to make it happen.
if (GPRInfo::numberOfRegisters < 6
&& oldStructure->outOfLineCapacity() != structure->outOfLineCapacity()
&& oldStructure->outOfLineCapacity())
return false;
// Skip optimizing the case where we need realloc, and the structure has
// indexing storage.
if (hasIndexingHeader(oldStructure->indexingType()))
return false;
if (normalizePrototypeChain(exec, baseCell) == InvalidPrototypeChain)
return false;
StructureChain* prototypeChain = structure->prototypeChain(exec);
emitPutTransitionStub(
exec, baseValue, ident, slot, stubInfo, putKind,
structure, oldStructure, prototypeChain,
stubInfo.callReturnLocation.labelAtOffset(stubInfo.patch.dfg.deltaCallToSlowCase),
stubInfo.stubRoutine);
RepatchBuffer repatchBuffer(codeBlock);
repatchBuffer.relink(
stubInfo.callReturnLocation.jumpAtOffset(