JITPropertyAccess.cpp [plain text]
#include "config.h"
#include "JIT.h"
#if ENABLE(JIT)
#include "CodeBlock.h"
#include "JITInlineMethods.h"
#include "JITStubCall.h"
#include "JSArray.h"
#include "JSFunction.h"
#include "Interpreter.h"
#include "ResultType.h"
#include "SamplingTool.h"
#ifndef NDEBUG
#include <stdio.h>
#endif
using namespace std;
namespace JSC {
void JIT::emit_op_put_by_id(Instruction* currentInstruction)
{
compilePutByIdHotPath(currentInstruction[1].u.operand, &(m_codeBlock->identifier(currentInstruction[2].u.operand)), currentInstruction[3].u.operand, m_propertyAccessInstructionIndex++);
}
void JIT::emit_op_get_by_id(Instruction* currentInstruction)
{
compileGetByIdHotPath(currentInstruction[1].u.operand, currentInstruction[2].u.operand, &(m_codeBlock->identifier(currentInstruction[3].u.operand)), m_propertyAccessInstructionIndex++);
}
void JIT::emit_op_get_by_val(Instruction* currentInstruction)
{
emitGetVirtualRegisters(currentInstruction[2].u.operand, regT0, currentInstruction[3].u.operand, regT1);
emitJumpSlowCaseIfNotImmediateInteger(regT1);
#if USE(ALTERNATE_JSIMMEDIATE)
zeroExtend32ToPtr(regT1, regT1);
#else
emitFastArithImmToInt(regT1);
#endif
emitJumpSlowCaseIfNotJSCell(regT0);
addSlowCase(branchPtr(NotEqual, Address(regT0), ImmPtr(m_globalData->jsArrayVPtr)));
loadPtr(Address(regT0, FIELD_OFFSET(JSArray, m_storage)), regT2);
addSlowCase(branch32(AboveOrEqual, regT1, Address(regT0, FIELD_OFFSET(JSArray, m_fastAccessCutoff))));
loadPtr(BaseIndex(regT2, regT1, ScalePtr, FIELD_OFFSET(ArrayStorage, m_vector[0])), regT0);
emitPutVirtualRegister(currentInstruction[1].u.operand);
}
void JIT::emit_op_put_by_val(Instruction* currentInstruction)
{
emitGetVirtualRegisters(currentInstruction[1].u.operand, regT0, currentInstruction[2].u.operand, regT1);
emitJumpSlowCaseIfNotImmediateInteger(regT1);
#if USE(ALTERNATE_JSIMMEDIATE)
zeroExtend32ToPtr(regT1, regT1);
#else
emitFastArithImmToInt(regT1);
#endif
emitJumpSlowCaseIfNotJSCell(regT0);
addSlowCase(branchPtr(NotEqual, Address(regT0), ImmPtr(m_globalData->jsArrayVPtr)));
loadPtr(Address(regT0, FIELD_OFFSET(JSArray, m_storage)), regT2);
Jump inFastVector = branch32(Below, regT1, Address(regT0, FIELD_OFFSET(JSArray, m_fastAccessCutoff)));
addSlowCase(branch32(AboveOrEqual, regT1, Address(regT2, FIELD_OFFSET(ArrayStorage, m_vectorLength))));
addSlowCase(branchTestPtr(Zero, BaseIndex(regT2, regT1, ScalePtr, FIELD_OFFSET(ArrayStorage, m_vector[0]))));
inFastVector.link(this);
emitGetVirtualRegister(currentInstruction[3].u.operand, regT0);
storePtr(regT0, BaseIndex(regT2, regT1, ScalePtr, FIELD_OFFSET(ArrayStorage, m_vector[0])));
}
void JIT::emit_op_put_by_index(Instruction* currentInstruction)
{
JITStubCall stubCall(this, JITStubs::cti_op_put_by_index);
stubCall.addArgument(currentInstruction[1].u.operand, regT2);
stubCall.addArgument(Imm32(currentInstruction[2].u.operand));
stubCall.addArgument(currentInstruction[3].u.operand, regT2);
stubCall.call();
}
void JIT::emit_op_put_getter(Instruction* currentInstruction)
{
JITStubCall stubCall(this, JITStubs::cti_op_put_getter);
stubCall.addArgument(currentInstruction[1].u.operand, regT2);
stubCall.addArgument(ImmPtr(&m_codeBlock->identifier(currentInstruction[2].u.operand)));
stubCall.addArgument(currentInstruction[3].u.operand, regT2);
stubCall.call();
}
void JIT::emit_op_put_setter(Instruction* currentInstruction)
{
JITStubCall stubCall(this, JITStubs::cti_op_put_setter);
stubCall.addArgument(currentInstruction[1].u.operand, regT2);
stubCall.addArgument(ImmPtr(&m_codeBlock->identifier(currentInstruction[2].u.operand)));
stubCall.addArgument(currentInstruction[3].u.operand, regT2);
stubCall.call();
}
void JIT::emit_op_del_by_id(Instruction* currentInstruction)
{
JITStubCall stubCall(this, JITStubs::cti_op_del_by_id);
stubCall.addArgument(currentInstruction[2].u.operand, regT2);
stubCall.addArgument(ImmPtr(&m_codeBlock->identifier(currentInstruction[3].u.operand)));
stubCall.call(currentInstruction[1].u.operand);
}
#if !ENABLE(JIT_OPTIMIZE_PROPERTY_ACCESS)
void JIT::compileGetByIdHotPath(int resultVReg, int baseVReg, Identifier* ident, unsigned)
{
emitGetVirtualRegister(baseVReg, regT0);
JITStubCall stubCall(this, JITStubs::cti_op_get_by_id_generic);
stubCall.addArgument(regT0);
stubCall.addArgument(ImmPtr(ident));
stubCall.call(resultVReg);
}
void JIT::compileGetByIdSlowCase(int, int, Identifier*, Vector<SlowCaseEntry>::iterator&, unsigned)
{
ASSERT_NOT_REACHED();
}
void JIT::compilePutByIdHotPath(int baseVReg, Identifier* ident, int valueVReg, unsigned)
{
emitGetVirtualRegisters(baseVReg, regT0, valueVReg, regT1);
JITStubCall stubCall(this, JITStubs::cti_op_put_by_id_generic);
stubCall.addArgument(regT0);
stubCall.addArgument(ImmPtr(ident));
stubCall.addArgument(regT1);
stubCall.call();
}
void JIT::compilePutByIdSlowCase(int, Identifier*, int, Vector<SlowCaseEntry>::iterator&, unsigned)
{
ASSERT_NOT_REACHED();
}
#else // !ENABLE(JIT_OPTIMIZE_PROPERTY_ACCESS)
void JIT::compileGetByIdHotPath(int resultVReg, int baseVReg, Identifier*, unsigned propertyAccessInstructionIndex)
{
emitGetVirtualRegister(baseVReg, regT0);
emitJumpSlowCaseIfNotJSCell(regT0, baseVReg);
Label hotPathBegin(this);
m_propertyAccessCompilationInfo[propertyAccessInstructionIndex].hotPathBegin = hotPathBegin;
DataLabelPtr structureToCompare;
Jump structureCheck = branchPtrWithPatch(NotEqual, Address(regT0, FIELD_OFFSET(JSCell, m_structure)), structureToCompare, ImmPtr(reinterpret_cast<void*>(patchGetByIdDefaultStructure)));
addSlowCase(structureCheck);
ASSERT(differenceBetween(hotPathBegin, structureToCompare) == patchOffsetGetByIdStructure);
ASSERT(differenceBetween(hotPathBegin, structureCheck) == patchOffsetGetByIdBranchToSlowCase);
Label externalLoad(this);
loadPtr(Address(regT0, FIELD_OFFSET(JSObject, m_externalStorage)), regT0);
Label externalLoadComplete(this);
ASSERT(differenceBetween(hotPathBegin, externalLoad) == patchOffsetGetByIdExternalLoad);
ASSERT(differenceBetween(externalLoad, externalLoadComplete) == patchLengthGetByIdExternalLoad);
DataLabel32 displacementLabel = loadPtrWithAddressOffsetPatch(Address(regT0, patchGetByIdDefaultOffset), regT0);
ASSERT(differenceBetween(hotPathBegin, displacementLabel) == patchOffsetGetByIdPropertyMapOffset);
Label putResult(this);
ASSERT(differenceBetween(hotPathBegin, putResult) == patchOffsetGetByIdPutResult);
emitPutVirtualRegister(resultVReg);
}
void JIT::compileGetByIdSlowCase(int resultVReg, int baseVReg, Identifier* ident, Vector<SlowCaseEntry>::iterator& iter, unsigned propertyAccessInstructionIndex)
{
linkSlowCaseIfNotJSCell(iter, baseVReg);
linkSlowCase(iter);
#ifndef NDEBUG
Label coldPathBegin(this);
#endif
JITStubCall stubCall(this, JITStubs::cti_op_get_by_id);
stubCall.addArgument(regT0);
stubCall.addArgument(ImmPtr(ident));
Call call = stubCall.call(resultVReg);
ASSERT(differenceBetween(coldPathBegin, call) == patchOffsetGetByIdSlowCaseCall);
m_propertyAccessCompilationInfo[propertyAccessInstructionIndex].callReturnLocation = call;
}
void JIT::compilePutByIdHotPath(int baseVReg, Identifier*, int valueVReg, unsigned propertyAccessInstructionIndex)
{
emitGetVirtualRegisters(baseVReg, regT0, valueVReg, regT1);
emitJumpSlowCaseIfNotJSCell(regT0, baseVReg);
Label hotPathBegin(this);
m_propertyAccessCompilationInfo[propertyAccessInstructionIndex].hotPathBegin = hotPathBegin;
DataLabelPtr structureToCompare;
addSlowCase(branchPtrWithPatch(NotEqual, Address(regT0, FIELD_OFFSET(JSCell, m_structure)), structureToCompare, ImmPtr(reinterpret_cast<void*>(patchGetByIdDefaultStructure))));
ASSERT(differenceBetween(hotPathBegin, structureToCompare) == patchOffsetPutByIdStructure);
Label externalLoad(this);
loadPtr(Address(regT0, FIELD_OFFSET(JSObject, m_externalStorage)), regT0);
Label externalLoadComplete(this);
ASSERT(differenceBetween(hotPathBegin, externalLoad) == patchOffsetPutByIdExternalLoad);
ASSERT(differenceBetween(externalLoad, externalLoadComplete) == patchLengthPutByIdExternalLoad);
DataLabel32 displacementLabel = storePtrWithAddressOffsetPatch(regT1, Address(regT0, patchGetByIdDefaultOffset));
ASSERT(differenceBetween(hotPathBegin, displacementLabel) == patchOffsetPutByIdPropertyMapOffset);
}
void JIT::compilePutByIdSlowCase(int baseVReg, Identifier* ident, int, Vector<SlowCaseEntry>::iterator& iter, unsigned propertyAccessInstructionIndex)
{
linkSlowCaseIfNotJSCell(iter, baseVReg);
linkSlowCase(iter);
JITStubCall stubCall(this, JITStubs::cti_op_put_by_id);
stubCall.addArgument(regT0);
stubCall.addArgument(ImmPtr(ident));
stubCall.addArgument(regT1);
Call call = stubCall.call();
m_propertyAccessCompilationInfo[propertyAccessInstructionIndex].callReturnLocation = call;
}
void JIT::compilePutDirectOffset(RegisterID base, RegisterID value, Structure* structure, size_t cachedOffset)
{
int offset = cachedOffset * sizeof(JSValue);
if (structure->isUsingInlineStorage())
offset += FIELD_OFFSET(JSObject, m_inlineStorage);
else
loadPtr(Address(base, FIELD_OFFSET(JSObject, m_externalStorage)), base);
storePtr(value, Address(base, offset));
}
void JIT::compileGetDirectOffset(RegisterID base, RegisterID result, Structure* structure, size_t cachedOffset)
{
int offset = cachedOffset * sizeof(JSValue);
if (structure->isUsingInlineStorage())
offset += FIELD_OFFSET(JSObject, m_inlineStorage);
else
loadPtr(Address(base, FIELD_OFFSET(JSObject, m_externalStorage)), base);
loadPtr(Address(base, offset), result);
}
void JIT::compileGetDirectOffset(JSObject* base, RegisterID temp, RegisterID result, size_t cachedOffset)
{
if (base->isUsingInlineStorage())
loadPtr(static_cast<void*>(&base->m_inlineStorage[cachedOffset]), result);
else {
PropertyStorage* protoPropertyStorage = &base->m_externalStorage;
loadPtr(static_cast<void*>(protoPropertyStorage), temp);
loadPtr(Address(temp, cachedOffset * sizeof(JSValue)), result);
}
}
static JSObject* resizePropertyStorage(JSObject* baseObject, int32_t oldSize, int32_t newSize)
{
baseObject->allocatePropertyStorage(oldSize, newSize);
return baseObject;
}
static inline bool transitionWillNeedStorageRealloc(Structure* oldStructure, Structure* newStructure)
{
return oldStructure->propertyStorageCapacity() != newStructure->propertyStorageCapacity();
}
void JIT::privateCompilePutByIdTransition(StructureStubInfo* stubInfo, Structure* oldStructure, Structure* newStructure, size_t cachedOffset, StructureChain* chain, ProcessorReturnAddress returnAddress)
{
JumpList failureCases;
failureCases.append(emitJumpIfNotJSCell(regT0));
failureCases.append(branchPtr(NotEqual, Address(regT0, FIELD_OFFSET(JSCell, m_structure)), ImmPtr(oldStructure)));
JumpList successCases;
loadPtr(Address(regT0, FIELD_OFFSET(JSCell, m_structure)), regT2);
failureCases.append(branch32(NotEqual, Address(regT2, FIELD_OFFSET(Structure, m_typeInfo) + FIELD_OFFSET(TypeInfo, m_type)), Imm32(ObjectType)));
loadPtr(Address(regT2, FIELD_OFFSET(Structure, m_prototype)), regT2);
for (RefPtr<Structure>* it = chain->head(); *it; ++it) {
successCases.append(branchPtr(Equal, regT2, ImmPtr(JSValue::encode(jsNull()))));
failureCases.append(branchPtr(NotEqual, Address(regT2, FIELD_OFFSET(JSCell, m_structure)), ImmPtr(it->get())));
loadPtr(Address(regT2, FIELD_OFFSET(JSCell, m_structure)), regT2);
failureCases.append(branch32(NotEqual, Address(regT2, FIELD_OFFSET(Structure, m_typeInfo) + FIELD_OFFSET(TypeInfo, m_type)), Imm32(ObjectType)));
loadPtr(Address(regT2, FIELD_OFFSET(Structure, m_prototype)), regT2);
}
successCases.link(this);
Call callTarget;
bool willNeedStorageRealloc = transitionWillNeedStorageRealloc(oldStructure, newStructure);
if (willNeedStorageRealloc) {
pop(X86::ebx);
#if PLATFORM(X86_64)
ASSERT(regT0 != X86::edx);
ASSERT(regT0 != X86::esi);
ASSERT(regT0 != X86::edi);
move(Imm32(newStructure->propertyStorageCapacity()), X86::edx);
move(Imm32(oldStructure->propertyStorageCapacity()), X86::esi);
move(regT0, X86::edi);
callTarget = call();
#else
push(Imm32(newStructure->propertyStorageCapacity()));
push(Imm32(oldStructure->propertyStorageCapacity()));
push(regT0);
callTarget = call();
addPtr(Imm32(3 * sizeof(void*)), X86::esp);
#endif
emitGetJITStubArg(3, regT1);
push(X86::ebx);
}
sub32(Imm32(1), AbsoluteAddress(oldStructure->addressOfCount()));
add32(Imm32(1), AbsoluteAddress(newStructure->addressOfCount()));
storePtr(ImmPtr(newStructure), Address(regT0, FIELD_OFFSET(JSCell, m_structure)));
compilePutDirectOffset(regT0, regT1, newStructure, cachedOffset);
ret();
ASSERT(!failureCases.empty());
failureCases.link(this);
restoreArgumentReferenceForTrampoline();
Call failureCall = tailRecursiveCall();
void* code = m_assembler.executableCopy(m_codeBlock->executablePool());
PatchBuffer patchBuffer(code);
patchBuffer.link(failureCall, JITStubs::cti_op_put_by_id_fail);
if (willNeedStorageRealloc)
patchBuffer.link(callTarget, resizePropertyStorage);
stubInfo->stubRoutine = patchBuffer.entry();
returnAddress.relinkCallerToFunction(code);
}
void JIT::patchGetByIdSelf(StructureStubInfo* stubInfo, Structure* structure, size_t cachedOffset, ProcessorReturnAddress returnAddress)
{
returnAddress.relinkCallerToFunction(JITStubs::cti_op_get_by_id_self_fail);
int offset = sizeof(JSValue) * cachedOffset;
if (structure->isUsingInlineStorage())
stubInfo->hotPathBegin.instructionAtOffset(patchOffsetGetByIdExternalLoad + patchLengthGetByIdExternalLoadPrefix).patchLoadToLEA();
stubInfo->hotPathBegin.dataLabelPtrAtOffset(patchOffsetGetByIdStructure).repatch(structure);
stubInfo->hotPathBegin.dataLabel32AtOffset(patchOffsetGetByIdPropertyMapOffset).repatch(offset);
}
void JIT::patchPutByIdReplace(StructureStubInfo* stubInfo, Structure* structure, size_t cachedOffset, ProcessorReturnAddress returnAddress)
{
returnAddress.relinkCallerToFunction(JITStubs::cti_op_put_by_id_generic);
int offset = sizeof(JSValue) * cachedOffset;
if (structure->isUsingInlineStorage())
stubInfo->hotPathBegin.instructionAtOffset(patchOffsetPutByIdExternalLoad + patchLengthPutByIdExternalLoadPrefix).patchLoadToLEA();
stubInfo->hotPathBegin.dataLabelPtrAtOffset(patchOffsetPutByIdStructure).repatch(structure);
stubInfo->hotPathBegin.dataLabel32AtOffset(patchOffsetPutByIdPropertyMapOffset).repatch(offset);
}
void JIT::privateCompilePatchGetArrayLength(ProcessorReturnAddress returnAddress)
{
StructureStubInfo* stubInfo = &m_codeBlock->getStubInfo(returnAddress);
returnAddress.relinkCallerToFunction(JITStubs::cti_op_get_by_id_array_fail);
Jump failureCases1 = branchPtr(NotEqual, Address(regT0), ImmPtr(m_globalData->jsArrayVPtr));
loadPtr(Address(regT0, FIELD_OFFSET(JSArray, m_storage)), regT2);
load32(Address(regT2, FIELD_OFFSET(ArrayStorage, m_length)), regT2);
Jump failureCases2 = branch32(Above, regT2, Imm32(JSImmediate::maxImmediateInt));
emitFastArithIntToImmNoCheck(regT2, regT0);
Jump success = jump();
void* code = m_assembler.executableCopy(m_codeBlock->executablePool());
PatchBuffer patchBuffer(code);
CodeLocationLabel slowCaseBegin = stubInfo->callReturnLocation.labelAtOffset(-patchOffsetGetByIdSlowCaseCall);
patchBuffer.link(failureCases1, slowCaseBegin);
patchBuffer.link(failureCases2, slowCaseBegin);
patchBuffer.link(success, stubInfo->hotPathBegin.labelAtOffset(patchOffsetGetByIdPutResult));
CodeLocationLabel entryLabel = patchBuffer.entry();
stubInfo->stubRoutine = entryLabel;
CodeLocationJump jumpLocation = stubInfo->hotPathBegin.jumpAtOffset(patchOffsetGetByIdBranchToSlowCase);
jumpLocation.relink(entryLabel);
}
void JIT::privateCompileGetByIdProto(StructureStubInfo* stubInfo, Structure* structure, Structure* prototypeStructure, size_t cachedOffset, ProcessorReturnAddress returnAddress, CallFrame* callFrame)
{
returnAddress.relinkCallerToFunction(JITStubs::cti_op_get_by_id_proto_list);
JSObject* protoObject = asObject(structure->prototypeForLookup(callFrame));
Jump failureCases1 = checkStructure(regT0, structure);
Structure** prototypeStructureAddress = &(protoObject->m_structure);
#if PLATFORM(X86_64)
move(ImmPtr(prototypeStructure), regT3);
Jump failureCases2 = branchPtr(NotEqual, AbsoluteAddress(prototypeStructureAddress), regT3);
#else
Jump failureCases2 = branchPtr(NotEqual, AbsoluteAddress(prototypeStructureAddress), ImmPtr(prototypeStructure));
#endif
compileGetDirectOffset(protoObject, regT1, regT0, cachedOffset);
Jump success = jump();
void* code = m_assembler.executableCopy(m_codeBlock->executablePool());
PatchBuffer patchBuffer(code);
CodeLocationLabel slowCaseBegin = stubInfo->callReturnLocation.labelAtOffset(-patchOffsetGetByIdSlowCaseCall);
patchBuffer.link(failureCases1, slowCaseBegin);
patchBuffer.link(failureCases2, slowCaseBegin);
patchBuffer.link(success, stubInfo->hotPathBegin.labelAtOffset(patchOffsetGetByIdPutResult));
CodeLocationLabel entryLabel = patchBuffer.entry();
stubInfo->stubRoutine = entryLabel;
CodeLocationJump jumpLocation = stubInfo->hotPathBegin.jumpAtOffset(patchOffsetGetByIdBranchToSlowCase);
jumpLocation.relink(entryLabel);
}
void JIT::privateCompileGetByIdSelfList(StructureStubInfo* stubInfo, PolymorphicAccessStructureList* polymorphicStructures, int currentIndex, Structure* structure, size_t cachedOffset)
{
Jump failureCase = checkStructure(regT0, structure);
compileGetDirectOffset(regT0, regT0, structure, cachedOffset);
Jump success = jump();
void* code = m_assembler.executableCopy(m_codeBlock->executablePool());
ASSERT(code);
PatchBuffer patchBuffer(code);
CodeLocationLabel lastProtoBegin = polymorphicStructures->list[currentIndex - 1].stubRoutine;
if (!lastProtoBegin)
lastProtoBegin = stubInfo->callReturnLocation.labelAtOffset(-patchOffsetGetByIdSlowCaseCall);
patchBuffer.link(failureCase, lastProtoBegin);
patchBuffer.link(success, stubInfo->hotPathBegin.labelAtOffset(patchOffsetGetByIdPutResult));
CodeLocationLabel entryLabel = patchBuffer.entry();
structure->ref();
polymorphicStructures->list[currentIndex].set(entryLabel, structure);
CodeLocationJump jumpLocation = stubInfo->hotPathBegin.jumpAtOffset(patchOffsetGetByIdBranchToSlowCase);
jumpLocation.relink(entryLabel);
}
void JIT::privateCompileGetByIdProtoList(StructureStubInfo* stubInfo, PolymorphicAccessStructureList* prototypeStructures, int currentIndex, Structure* structure, Structure* prototypeStructure, size_t cachedOffset, CallFrame* callFrame)
{
JSObject* protoObject = asObject(structure->prototypeForLookup(callFrame));
Jump failureCases1 = checkStructure(regT0, structure);
Structure** prototypeStructureAddress = &(protoObject->m_structure);
#if PLATFORM(X86_64)
move(ImmPtr(prototypeStructure), regT3);
Jump failureCases2 = branchPtr(NotEqual, AbsoluteAddress(prototypeStructureAddress), regT3);
#else
Jump failureCases2 = branchPtr(NotEqual, AbsoluteAddress(prototypeStructureAddress), ImmPtr(prototypeStructure));
#endif
compileGetDirectOffset(protoObject, regT1, regT0, cachedOffset);
Jump success = jump();
void* code = m_assembler.executableCopy(m_codeBlock->executablePool());
PatchBuffer patchBuffer(code);
CodeLocationLabel lastProtoBegin = prototypeStructures->list[currentIndex - 1].stubRoutine;
patchBuffer.link(failureCases1, lastProtoBegin);
patchBuffer.link(failureCases2, lastProtoBegin);
patchBuffer.link(success, stubInfo->hotPathBegin.labelAtOffset(patchOffsetGetByIdPutResult));
CodeLocationLabel entryLabel = patchBuffer.entry();
structure->ref();
prototypeStructure->ref();
prototypeStructures->list[currentIndex].set(entryLabel, structure, prototypeStructure);
CodeLocationJump jumpLocation = stubInfo->hotPathBegin.jumpAtOffset(patchOffsetGetByIdBranchToSlowCase);
jumpLocation.relink(entryLabel);
}
void JIT::privateCompileGetByIdChainList(StructureStubInfo* stubInfo, PolymorphicAccessStructureList* prototypeStructures, int currentIndex, Structure* structure, StructureChain* chain, size_t count, size_t cachedOffset, CallFrame* callFrame)
{
ASSERT(count);
JumpList bucketsOfFail;
Jump baseObjectCheck = checkStructure(regT0, structure);
bucketsOfFail.append(baseObjectCheck);
Structure* currStructure = structure;
RefPtr<Structure>* chainEntries = chain->head();
JSObject* protoObject = 0;
for (unsigned i = 0; i < count; ++i) {
protoObject = asObject(currStructure->prototypeForLookup(callFrame));
currStructure = chainEntries[i].get();
Structure** prototypeStructureAddress = &(protoObject->m_structure);
#if PLATFORM(X86_64)
move(ImmPtr(currStructure), regT3);
bucketsOfFail.append(branchPtr(NotEqual, AbsoluteAddress(prototypeStructureAddress), regT3));
#else
bucketsOfFail.append(branchPtr(NotEqual, AbsoluteAddress(prototypeStructureAddress), ImmPtr(currStructure)));
#endif
}
ASSERT(protoObject);
compileGetDirectOffset(protoObject, regT1, regT0, cachedOffset);
Jump success = jump();
void* code = m_assembler.executableCopy(m_codeBlock->executablePool());
PatchBuffer patchBuffer(code);
CodeLocationLabel lastProtoBegin = prototypeStructures->list[currentIndex - 1].stubRoutine;
patchBuffer.link(bucketsOfFail, lastProtoBegin);
patchBuffer.link(success, stubInfo->hotPathBegin.labelAtOffset(patchOffsetGetByIdPutResult));
CodeLocationLabel entryLabel = patchBuffer.entry();
structure->ref();
chain->ref();
prototypeStructures->list[currentIndex].set(entryLabel, structure, chain);
CodeLocationJump jumpLocation = stubInfo->hotPathBegin.jumpAtOffset(patchOffsetGetByIdBranchToSlowCase);
jumpLocation.relink(entryLabel);
}
void JIT::privateCompileGetByIdChain(StructureStubInfo* stubInfo, Structure* structure, StructureChain* chain, size_t count, size_t cachedOffset, ProcessorReturnAddress returnAddress, CallFrame* callFrame)
{
returnAddress.relinkCallerToFunction(JITStubs::cti_op_get_by_id_proto_list);
ASSERT(count);
JumpList bucketsOfFail;
bucketsOfFail.append(checkStructure(regT0, structure));
Structure* currStructure = structure;
RefPtr<Structure>* chainEntries = chain->head();
JSObject* protoObject = 0;
for (unsigned i = 0; i < count; ++i) {
protoObject = asObject(currStructure->prototypeForLookup(callFrame));
currStructure = chainEntries[i].get();
Structure** prototypeStructureAddress = &(protoObject->m_structure);
#if PLATFORM(X86_64)
move(ImmPtr(currStructure), regT3);
bucketsOfFail.append(branchPtr(NotEqual, AbsoluteAddress(prototypeStructureAddress), regT3));
#else
bucketsOfFail.append(branchPtr(NotEqual, AbsoluteAddress(prototypeStructureAddress), ImmPtr(currStructure)));
#endif
}
ASSERT(protoObject);
compileGetDirectOffset(protoObject, regT1, regT0, cachedOffset);
Jump success = jump();
void* code = m_assembler.executableCopy(m_codeBlock->executablePool());
PatchBuffer patchBuffer(code);
patchBuffer.link(bucketsOfFail, stubInfo->callReturnLocation.labelAtOffset(-patchOffsetGetByIdSlowCaseCall));
patchBuffer.link(success, stubInfo->hotPathBegin.labelAtOffset(patchOffsetGetByIdPutResult));
CodeLocationLabel entryLabel = patchBuffer.entry();
stubInfo->stubRoutine = entryLabel;
CodeLocationJump jumpLocation = stubInfo->hotPathBegin.jumpAtOffset(patchOffsetGetByIdBranchToSlowCase);
jumpLocation.relink(entryLabel);
}
#endif // !ENABLE(JIT_OPTIMIZE_PROPERTY_ACCESS)
}
#endif // ENABLE(JIT)