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Copy pathRepatch.cpp
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1602 lines (1357 loc) · 72.6 KB
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/*
* Copyright (C) 2011-2020 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 "BinarySwitch.h"
#include "CCallHelpers.h"
#include "CacheableIdentifierInlines.h"
#include "CallFrameShuffler.h"
#include "DFGOperations.h"
#include "DFGSpeculativeJIT.h"
#include "DOMJITGetterSetter.h"
#include "DirectArguments.h"
#include "ExecutableBaseInlines.h"
#include "FTLThunks.h"
#include "FullCodeOrigin.h"
#include "FunctionCodeBlock.h"
#include "GCAwareJITStubRoutine.h"
#include "GetterSetter.h"
#include "GetterSetterAccessCase.h"
#include "ICStats.h"
#include "InlineAccess.h"
#include "InstanceOfAccessCase.h"
#include "IntrinsicGetterAccessCase.h"
#include "JIT.h"
#include "JITInlines.h"
#include "JSCInlines.h"
#include "JSModuleNamespaceObject.h"
#include "JSWebAssembly.h"
#include "JSWebAssemblyModule.h"
#include "LinkBuffer.h"
#include "ModuleNamespaceAccessCase.h"
#include "PolymorphicAccess.h"
#include "ScopedArguments.h"
#include "ScratchRegisterAllocator.h"
#include "StackAlignment.h"
#include "StructureRareDataInlines.h"
#include "StructureStubClearingWatchpoint.h"
#include "StructureStubInfo.h"
#include "SuperSampler.h"
#include "ThunkGenerators.h"
#include "WebAssemblyFunction.h"
#include <wtf/CommaPrinter.h>
#include <wtf/ListDump.h>
#include <wtf/StringPrintStream.h>
namespace JSC {
static FunctionPtr<CFunctionPtrTag> readPutICCallTarget(CodeBlock* codeBlock, CodeLocationCall<JSInternalPtrTag> call)
{
#if ENABLE(FTL_JIT)
if (codeBlock->jitType() == JITType::FTLJIT) {
FunctionPtr<JITThunkPtrTag> target = MacroAssembler::readCallTarget<JITThunkPtrTag>(call);
MacroAssemblerCodePtr<JITThunkPtrTag> thunk = MacroAssemblerCodePtr<JITThunkPtrTag>::createFromExecutableAddress(target.executableAddress());
return codeBlock->vm().ftlThunks->keyForSlowPathCallThunk(thunk).callTarget().retagged<CFunctionPtrTag>();
}
#else
UNUSED_PARAM(codeBlock);
#endif // ENABLE(FTL_JIT)
FunctionPtr<OperationPtrTag> target = MacroAssembler::readCallTarget<OperationPtrTag>(call);
return target.retagged<CFunctionPtrTag>();
}
void ftlThunkAwareRepatchCall(CodeBlock* codeBlock, CodeLocationCall<JSInternalPtrTag> call, FunctionPtr<CFunctionPtrTag> newCalleeFunction)
{
#if ENABLE(FTL_JIT)
if (codeBlock->jitType() == JITType::FTLJIT) {
VM& vm = codeBlock->vm();
FTL::Thunks& thunks = *vm.ftlThunks;
FunctionPtr<JITThunkPtrTag> target = MacroAssembler::readCallTarget<JITThunkPtrTag>(call);
auto slowPathThunk = MacroAssemblerCodePtr<JITThunkPtrTag>::createFromExecutableAddress(target.executableAddress());
FTL::SlowPathCallKey key = thunks.keyForSlowPathCallThunk(slowPathThunk);
key = key.withCallTarget(newCalleeFunction);
MacroAssembler::repatchCall(call, FunctionPtr<JITThunkPtrTag>(thunks.getSlowPathCallThunk(vm, key).code()));
return;
}
#else // ENABLE(FTL_JIT)
UNUSED_PARAM(codeBlock);
#endif // ENABLE(FTL_JIT)
MacroAssembler::repatchCall(call, newCalleeFunction.retagged<OperationPtrTag>());
}
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;
}
if (!structure->propertyAccessesAreCacheable())
return GiveUpOnCache;
return AttemptToCache;
}
static bool forceICFailure(JSGlobalObject*)
{
return Options::forceICFailure();
}
ALWAYS_INLINE static void fireWatchpointsAndClearStubIfNeeded(VM& vm, StructureStubInfo& stubInfo, CodeBlock* codeBlock, AccessGenerationResult& result)
{
if (result.shouldResetStubAndFireWatchpoints()) {
result.fireWatchpoints(vm);
{
GCSafeConcurrentJSLocker locker(codeBlock->m_lock, vm.heap);
stubInfo.reset(locker, codeBlock);
}
}
}
inline FunctionPtr<CFunctionPtrTag> appropriateOptimizingGetByFunction(GetByKind kind)
{
switch (kind) {
case GetByKind::Normal:
return operationGetByIdOptimize;
case GetByKind::WithThis:
return operationGetByIdWithThisOptimize;
case GetByKind::Try:
return operationTryGetByIdOptimize;
case GetByKind::Direct:
return operationGetByIdDirectOptimize;
case GetByKind::NormalByVal:
return operationGetByValOptimize;
case GetByKind::PrivateName:
return operationGetPrivateNameOptimize;
case GetByKind::PrivateNameById:
return operationGetPrivateNameByIdOptimize;
}
RELEASE_ASSERT_NOT_REACHED();
}
inline FunctionPtr<CFunctionPtrTag> appropriateGetByFunction(GetByKind kind)
{
switch (kind) {
case GetByKind::Normal:
return operationGetById;
case GetByKind::WithThis:
return operationGetByIdWithThis;
case GetByKind::Try:
return operationTryGetById;
case GetByKind::Direct:
return operationGetByIdDirect;
case GetByKind::NormalByVal:
return operationGetByValGeneric;
case GetByKind::PrivateName:
return operationGetPrivateName;
case GetByKind::PrivateNameById:
return operationGetPrivateNameById;
}
RELEASE_ASSERT_NOT_REACHED();
}
static InlineCacheAction tryCacheGetBy(JSGlobalObject* globalObject, CodeBlock* codeBlock, JSValue baseValue, CacheableIdentifier propertyName, const PropertySlot& slot, StructureStubInfo& stubInfo, GetByKind kind)
{
VM& vm = globalObject->vm();
AccessGenerationResult result;
{
GCSafeConcurrentJSLocker locker(codeBlock->m_lock, globalObject->vm().heap);
if (forceICFailure(globalObject))
return GiveUpOnCache;
// FIXME: Cache property access for immediates.
if (!baseValue.isCell())
return GiveUpOnCache;
JSCell* baseCell = baseValue.asCell();
const bool isPrivate = kind == GetByKind::PrivateName || kind == GetByKind::PrivateNameById;
std::unique_ptr<AccessCase> newCase;
if (propertyName == vm.propertyNames->length) {
if (isJSArray(baseCell)) {
if (stubInfo.cacheType() == CacheType::Unset
&& slot.slotBase() == baseCell
&& InlineAccess::isCacheableArrayLength(stubInfo, jsCast<JSArray*>(baseCell))) {
bool generatedCodeInline = InlineAccess::generateArrayLength(stubInfo, jsCast<JSArray*>(baseCell));
if (generatedCodeInline) {
ftlThunkAwareRepatchCall(codeBlock, stubInfo.slowPathCallLocation, appropriateOptimizingGetByFunction(kind));
stubInfo.initArrayLength(locker);
return RetryCacheLater;
}
}
newCase = AccessCase::create(vm, codeBlock, AccessCase::ArrayLength, propertyName);
} else if (isJSString(baseCell)) {
if (stubInfo.cacheType() == CacheType::Unset && InlineAccess::isCacheableStringLength(stubInfo)) {
bool generatedCodeInline = InlineAccess::generateStringLength(stubInfo);
if (generatedCodeInline) {
ftlThunkAwareRepatchCall(codeBlock, stubInfo.slowPathCallLocation, appropriateOptimizingGetByFunction(kind));
stubInfo.initStringLength(locker);
return RetryCacheLater;
}
}
newCase = AccessCase::create(vm, codeBlock, AccessCase::StringLength, propertyName);
} else if (DirectArguments* arguments = jsDynamicCast<DirectArguments*>(vm, baseCell)) {
// If there were overrides, then we can handle this as a normal property load! Guarding
// this with such a check enables us to add an IC case for that load if needed.
if (!arguments->overrodeThings())
newCase = AccessCase::create(vm, codeBlock, AccessCase::DirectArgumentsLength, propertyName);
} else if (ScopedArguments* arguments = jsDynamicCast<ScopedArguments*>(vm, baseCell)) {
// Ditto.
if (!arguments->overrodeThings())
newCase = AccessCase::create(vm, codeBlock, AccessCase::ScopedArgumentsLength, propertyName);
}
}
if (!propertyName.isSymbol() && baseCell->inherits<JSModuleNamespaceObject>(vm) && !slot.isUnset()) {
if (auto moduleNamespaceSlot = slot.moduleNamespaceSlot())
newCase = ModuleNamespaceAccessCase::create(vm, codeBlock, propertyName, jsCast<JSModuleNamespaceObject*>(baseCell), moduleNamespaceSlot->environment, ScopeOffset(moduleNamespaceSlot->scopeOffset));
}
if (!newCase) {
if (!slot.isCacheable() && !slot.isUnset())
return GiveUpOnCache;
ObjectPropertyConditionSet conditionSet;
Structure* structure = baseCell->structure(vm);
bool loadTargetFromProxy = false;
if (baseCell->type() == PureForwardingProxyType) {
if (isPrivate)
return GiveUpOnCache;
baseValue = jsCast<JSProxy*>(baseCell)->target();
baseCell = baseValue.asCell();
structure = baseCell->structure(vm);
loadTargetFromProxy = true;
}
InlineCacheAction action = actionForCell(vm, baseCell);
if (action != AttemptToCache)
return action;
// Optimize self access.
if (stubInfo.cacheType() == CacheType::Unset
&& slot.isCacheableValue()
&& slot.slotBase() == baseValue
&& !slot.watchpointSet()
&& !structure->needImpurePropertyWatchpoint()
&& !loadTargetFromProxy) {
bool generatedCodeInline = InlineAccess::generateSelfPropertyAccess(stubInfo, structure, slot.cachedOffset());
if (generatedCodeInline) {
LOG_IC((ICEvent::GetBySelfPatch, structure->classInfo(), Identifier::fromUid(vm, propertyName.uid()), slot.slotBase() == baseValue));
structure->startWatchingPropertyForReplacements(vm, slot.cachedOffset());
ftlThunkAwareRepatchCall(codeBlock, stubInfo.slowPathCallLocation, appropriateOptimizingGetByFunction(kind));
stubInfo.initGetByIdSelf(locker, codeBlock, structure, slot.cachedOffset(), propertyName);
return RetryCacheLater;
}
}
std::unique_ptr<PolyProtoAccessChain> prototypeAccessChain;
PropertyOffset offset = slot.isUnset() ? invalidOffset : slot.cachedOffset();
if (slot.isCustom() && slot.slotBase() == baseValue) {
// To cache self customs, we must disallow dictionaries because we
// need to be informed if the custom goes away since we cache the
// constant function pointer.
if (!prepareChainForCaching(globalObject, slot.slotBase(), slot.slotBase()))
return GiveUpOnCache;
}
if (slot.isUnset() || slot.slotBase() != baseValue) {
if (structure->typeInfo().prohibitsPropertyCaching())
return GiveUpOnCache;
if (structure->isDictionary()) {
if (structure->hasBeenFlattenedBefore())
return GiveUpOnCache;
structure->flattenDictionaryStructure(vm, jsCast<JSObject*>(baseCell));
return RetryCacheLater; // We may have changed property offsets.
}
if (slot.isUnset() && structure->typeInfo().getOwnPropertySlotIsImpureForPropertyAbsence())
return GiveUpOnCache;
// If a kind is GetByKind::Direct or GetByKind::PrivateName, we do not need to investigate prototype chains further.
// Cacheability just depends on the head structure.
if (kind != GetByKind::Direct && !isPrivate) {
auto cacheStatus = prepareChainForCaching(globalObject, baseCell, slot);
if (!cacheStatus)
return GiveUpOnCache;
if (cacheStatus->flattenedDictionary) {
// Property offsets may have changed due to flattening. We'll cache later.
return RetryCacheLater;
}
if (cacheStatus->usesPolyProto) {
prototypeAccessChain = PolyProtoAccessChain::create(globalObject, baseCell, slot);
if (!prototypeAccessChain)
return GiveUpOnCache;
RELEASE_ASSERT(slot.isCacheableCustom() || prototypeAccessChain->slotBaseStructure(vm, structure)->get(vm, propertyName.uid()) == offset);
} else {
// We use ObjectPropertyConditionSet instead for faster accesses.
prototypeAccessChain = nullptr;
// FIXME: Maybe this `if` should be inside generateConditionsForPropertyBlah.
// https://bugs.webkit.org/show_bug.cgi?id=185215
if (slot.isUnset()) {
conditionSet = generateConditionsForPropertyMiss(
vm, codeBlock, globalObject, structure, propertyName.uid());
} else if (!slot.isCacheableCustom()) {
conditionSet = generateConditionsForPrototypePropertyHit(
vm, codeBlock, globalObject, structure, slot.slotBase(),
propertyName.uid());
RELEASE_ASSERT(!conditionSet.isValid() || conditionSet.slotBaseCondition().offset() == offset);
} else {
conditionSet = generateConditionsForPrototypePropertyHitCustom(
vm, codeBlock, globalObject, structure, slot.slotBase(),
propertyName.uid(), slot.attributes());
}
if (!conditionSet.isValid())
return GiveUpOnCache;
}
}
}
JSFunction* getter = nullptr;
if (slot.isCacheableGetter())
getter = jsDynamicCast<JSFunction*>(vm, slot.getterSetter()->getter());
Optional<DOMAttributeAnnotation> domAttribute;
if (slot.isCacheableCustom() && slot.domAttribute())
domAttribute = slot.domAttribute();
if (kind == GetByKind::Try) {
AccessCase::AccessType type;
if (slot.isCacheableValue())
type = AccessCase::Load;
else if (slot.isUnset())
type = AccessCase::Miss;
else if (slot.isCacheableGetter())
type = AccessCase::GetGetter;
else
RELEASE_ASSERT_NOT_REACHED();
newCase = ProxyableAccessCase::create(vm, codeBlock, type, propertyName, offset, structure, conditionSet, loadTargetFromProxy, slot.watchpointSet(), WTFMove(prototypeAccessChain));
} else if (!loadTargetFromProxy && getter && IntrinsicGetterAccessCase::canEmitIntrinsicGetter(getter, structure))
newCase = IntrinsicGetterAccessCase::create(vm, codeBlock, propertyName, slot.cachedOffset(), structure, conditionSet, getter, WTFMove(prototypeAccessChain));
else {
if (isPrivate) {
RELEASE_ASSERT(!slot.isUnset());
constexpr bool isProxy = false;
if (!slot.isCacheable())
return GiveUpOnCache;
newCase = ProxyableAccessCase::create(vm, codeBlock, AccessCase::Load, propertyName, offset, structure,
conditionSet, isProxy, slot.watchpointSet(), WTFMove(prototypeAccessChain));
} else if (slot.isCacheableValue() || slot.isUnset()) {
newCase = ProxyableAccessCase::create(vm, codeBlock, slot.isUnset() ? AccessCase::Miss : AccessCase::Load,
propertyName, offset, structure, conditionSet, loadTargetFromProxy, slot.watchpointSet(), WTFMove(prototypeAccessChain));
} else {
AccessCase::AccessType type;
if (slot.isCacheableGetter())
type = AccessCase::Getter;
else if (slot.attributes() & PropertyAttribute::CustomAccessor)
type = AccessCase::CustomAccessorGetter;
else
type = AccessCase::CustomValueGetter;
if (kind == GetByKind::WithThis && type == AccessCase::CustomAccessorGetter && domAttribute)
return GiveUpOnCache;
newCase = GetterSetterAccessCase::create(
vm, codeBlock, type, propertyName, offset, structure, conditionSet, loadTargetFromProxy,
slot.watchpointSet(), slot.isCacheableCustom() ? FunctionPtr<CustomAccessorPtrTag>(slot.customGetter()) : nullptr,
slot.isCacheableCustom() && slot.slotBase() != baseValue ? slot.slotBase() : nullptr,
domAttribute, WTFMove(prototypeAccessChain));
}
}
}
LOG_IC((ICEvent::GetByAddAccessCase, baseValue.classInfoOrNull(vm), Identifier::fromUid(vm, propertyName.uid()), slot.slotBase() == baseValue));
result = stubInfo.addAccessCase(locker, globalObject, codeBlock, ECMAMode::strict(), propertyName, WTFMove(newCase));
if (result.generatedSomeCode()) {
LOG_IC((ICEvent::GetByReplaceWithJump, baseValue.classInfoOrNull(vm), Identifier::fromUid(vm, propertyName.uid()), slot.slotBase() == baseValue));
RELEASE_ASSERT(result.code());
InlineAccess::rewireStubAsJump(stubInfo, CodeLocationLabel<JITStubRoutinePtrTag>(result.code()));
}
}
fireWatchpointsAndClearStubIfNeeded(vm, stubInfo, codeBlock, result);
return result.shouldGiveUpNow() ? GiveUpOnCache : RetryCacheLater;
}
void repatchGetBy(JSGlobalObject* globalObject, CodeBlock* codeBlock, JSValue baseValue, CacheableIdentifier propertyName, const PropertySlot& slot, StructureStubInfo& stubInfo, GetByKind kind)
{
SuperSamplerScope superSamplerScope(false);
if (tryCacheGetBy(globalObject, codeBlock, baseValue, propertyName, slot, stubInfo, kind) == GiveUpOnCache)
ftlThunkAwareRepatchCall(codeBlock, stubInfo.slowPathCallLocation, appropriateGetByFunction(kind));
}
static InlineCacheAction tryCacheArrayGetByVal(JSGlobalObject* globalObject, CodeBlock* codeBlock, JSValue baseValue, JSValue index, StructureStubInfo& stubInfo)
{
if (!baseValue.isCell())
return GiveUpOnCache;
if (!index.isInt32())
return RetryCacheLater;
VM& vm = globalObject->vm();
AccessGenerationResult result;
{
GCSafeConcurrentJSLocker locker(codeBlock->m_lock, globalObject->vm().heap);
JSCell* base = baseValue.asCell();
AccessCase::AccessType accessType;
if (base->type() == DirectArgumentsType)
accessType = AccessCase::IndexedDirectArgumentsLoad;
else if (base->type() == ScopedArgumentsType)
accessType = AccessCase::IndexedScopedArgumentsLoad;
else if (base->type() == StringType)
accessType = AccessCase::IndexedStringLoad;
else if (isTypedView(base->classInfo(vm)->typedArrayStorageType)) {
switch (base->classInfo(vm)->typedArrayStorageType) {
case TypeInt8:
accessType = AccessCase::IndexedTypedArrayInt8Load;
break;
case TypeUint8:
accessType = AccessCase::IndexedTypedArrayUint8Load;
break;
case TypeUint8Clamped:
accessType = AccessCase::IndexedTypedArrayUint8ClampedLoad;
break;
case TypeInt16:
accessType = AccessCase::IndexedTypedArrayInt16Load;
break;
case TypeUint16:
accessType = AccessCase::IndexedTypedArrayUint16Load;
break;
case TypeInt32:
accessType = AccessCase::IndexedTypedArrayInt32Load;
break;
case TypeUint32:
accessType = AccessCase::IndexedTypedArrayUint32Load;
break;
case TypeFloat32:
accessType = AccessCase::IndexedTypedArrayFloat32Load;
break;
case TypeFloat64:
accessType = AccessCase::IndexedTypedArrayFloat64Load;
break;
default:
RELEASE_ASSERT_NOT_REACHED();
}
} else {
IndexingType indexingShape = base->indexingType() & IndexingShapeMask;
switch (indexingShape) {
case Int32Shape:
accessType = AccessCase::IndexedInt32Load;
break;
case DoubleShape:
accessType = AccessCase::IndexedDoubleLoad;
break;
case ContiguousShape:
accessType = AccessCase::IndexedContiguousLoad;
break;
case ArrayStorageShape:
accessType = AccessCase::IndexedArrayStorageLoad;
break;
default:
return GiveUpOnCache;
}
}
result = stubInfo.addAccessCase(locker, globalObject, codeBlock, ECMAMode::strict(), nullptr, AccessCase::create(vm, codeBlock, accessType, nullptr));
if (result.generatedSomeCode()) {
LOG_IC((ICEvent::GetByReplaceWithJump, baseValue.classInfoOrNull(vm), Identifier()));
RELEASE_ASSERT(result.code());
InlineAccess::rewireStubAsJump(stubInfo, CodeLocationLabel<JITStubRoutinePtrTag>(result.code()));
}
}
fireWatchpointsAndClearStubIfNeeded(vm, stubInfo, codeBlock, result);
return result.shouldGiveUpNow() ? GiveUpOnCache : RetryCacheLater;
}
void repatchArrayGetByVal(JSGlobalObject* globalObject, CodeBlock* codeBlock, JSValue base, JSValue index, StructureStubInfo& stubInfo)
{
if (tryCacheArrayGetByVal(globalObject, codeBlock, base, index, stubInfo) == GiveUpOnCache)
ftlThunkAwareRepatchCall(codeBlock, stubInfo.slowPathCallLocation, operationGetByValGeneric);
}
static auto appropriateGenericPutByIdFunction(const PutPropertySlot &slot, PutKind putKind) -> decltype(&operationPutByIdDirectStrict)
{
switch (putKind) {
case PutKind::NotDirect:
if (slot.isStrictMode())
return operationPutByIdStrict;
return operationPutByIdNonStrict;
case PutKind::Direct:
if (slot.isStrictMode())
return operationPutByIdDirectStrict;
return operationPutByIdDirectNonStrict;
case PutKind::DirectPrivateFieldDefine:
ASSERT(slot.isStrictMode());
return operationPutByIdDefinePrivateFieldStrict;
case PutKind::DirectPrivateFieldSet:
ASSERT(slot.isStrictMode());
return operationPutByIdSetPrivateFieldStrict;
}
// Make win port compiler happy
RELEASE_ASSERT_NOT_REACHED();
return nullptr;
}
static auto appropriateOptimizingPutByIdFunction(const PutPropertySlot &slot, PutKind putKind) -> decltype(&operationPutByIdDirectStrictOptimize)
{
switch (putKind) {
case PutKind::NotDirect:
if (slot.isStrictMode())
return operationPutByIdStrictOptimize;
return operationPutByIdNonStrictOptimize;
case PutKind::Direct:
if (slot.isStrictMode())
return operationPutByIdDirectStrictOptimize;
return operationPutByIdDirectNonStrictOptimize;
case PutKind::DirectPrivateFieldDefine:
ASSERT(slot.isStrictMode());
return operationPutByIdDefinePrivateFieldStrictOptimize;
case PutKind::DirectPrivateFieldSet:
ASSERT(slot.isStrictMode());
return operationPutByIdSetPrivateFieldStrictOptimize;
}
// Make win port compiler happy
RELEASE_ASSERT_NOT_REACHED();
return nullptr;
}
static InlineCacheAction tryCachePutByID(JSGlobalObject* globalObject, CodeBlock* codeBlock, JSValue baseValue, Structure* oldStructure, CacheableIdentifier propertyName, const PutPropertySlot& slot, StructureStubInfo& stubInfo, PutKind putKind)
{
VM& vm = globalObject->vm();
AccessGenerationResult result;
Identifier ident = Identifier::fromUid(vm, propertyName.uid());
{
GCSafeConcurrentJSLocker locker(codeBlock->m_lock, globalObject->vm().heap);
if (forceICFailure(globalObject))
return GiveUpOnCache;
if (!baseValue.isCell())
return GiveUpOnCache;
if (!slot.isCacheablePut() && !slot.isCacheableCustom() && !slot.isCacheableSetter())
return GiveUpOnCache;
// FIXME: We should try to do something smarter here...
if (isCopyOnWrite(oldStructure->indexingMode()))
return GiveUpOnCache;
// We can't end up storing to a CoW on the prototype since it shouldn't own properties.
ASSERT(!isCopyOnWrite(slot.base()->indexingMode()));
if (!oldStructure->propertyAccessesAreCacheable())
return GiveUpOnCache;
JSCell* baseCell = baseValue.asCell();
bool isProxy = false;
if (baseCell->type() == PureForwardingProxyType) {
baseCell = jsCast<JSProxy*>(baseCell)->target();
baseValue = baseCell;
isProxy = true;
// We currently only cache Replace and JS/Custom Setters on JSProxy. We don't
// cache transitions because global objects will never share the same structure
// in our current implementation.
bool isCacheableProxy = (slot.isCacheablePut() && slot.type() == PutPropertySlot::ExistingProperty)
|| slot.isCacheableSetter()
|| slot.isCacheableCustom();
if (!isCacheableProxy)
return GiveUpOnCache;
}
if (isProxy && (putKind == PutKind::DirectPrivateFieldSet || putKind == PutKind::DirectPrivateFieldDefine))
return GiveUpOnCache;
std::unique_ptr<AccessCase> newCase;
if (slot.base() == baseValue && slot.isCacheablePut()) {
if (slot.type() == PutPropertySlot::ExistingProperty) {
// This assert helps catch bugs if we accidentally forget to disable caching
// when we transition then store to an existing property. This is common among
// paths that reify lazy properties. If we reify a lazy property and forget
// to disable caching, we may come down this path. The Replace IC does not
// know how to model these types of structure transitions (or any structure
// transition for that matter).
RELEASE_ASSERT(baseValue.asCell()->structure(vm) == oldStructure);
oldStructure->didCachePropertyReplacement(vm, slot.cachedOffset());
if (stubInfo.cacheType() == CacheType::Unset
&& InlineAccess::canGenerateSelfPropertyReplace(stubInfo, slot.cachedOffset())
&& !oldStructure->needImpurePropertyWatchpoint()
&& !isProxy) {
bool generatedCodeInline = InlineAccess::generateSelfPropertyReplace(stubInfo, oldStructure, slot.cachedOffset());
if (generatedCodeInline) {
LOG_IC((ICEvent::PutByIdSelfPatch, oldStructure->classInfo(), ident, slot.base() == baseValue));
ftlThunkAwareRepatchCall(codeBlock, stubInfo.slowPathCallLocation, appropriateOptimizingPutByIdFunction(slot, putKind));
stubInfo.initPutByIdReplace(locker, codeBlock, oldStructure, slot.cachedOffset(), propertyName);
return RetryCacheLater;
}
}
newCase = ProxyableAccessCase::create(vm, codeBlock, AccessCase::Replace, propertyName, slot.cachedOffset(), oldStructure, ObjectPropertyConditionSet(), isProxy);
} else {
ASSERT(!isProxy);
ASSERT(slot.type() == PutPropertySlot::NewProperty);
if (!oldStructure->isObject())
return GiveUpOnCache;
// If the old structure is dictionary, it means that this is one-on-one between an object and a structure.
// If this is NewProperty operation, generating IC for this does not offer any benefit because this transition never happens again.
if (oldStructure->isDictionary())
return RetryCacheLater;
PropertyOffset offset;
Structure* newStructure = Structure::addPropertyTransitionToExistingStructureConcurrently(oldStructure, ident.impl(), static_cast<unsigned>(PropertyAttribute::None), offset);
if (!newStructure || !newStructure->propertyAccessesAreCacheable())
return GiveUpOnCache;
// If JSObject::put is overridden by UserObject, UserObject::put performs side-effect on JSObject::put, and it neglects to mark the PutPropertySlot as non-cachaeble,
// then arbitrary structure transitions can happen during the put operation, and this generates wrong transition information here as if oldStructure -> newStructure.
// In reality, the transition is oldStructure -> something unknown structures -> baseValue's structure.
// To guard against the embedder's potentially incorrect UserObject::put implementation, we should check for this condition and if found, and give up on caching the put.
ASSERT(baseValue.asCell()->structure(vm) == newStructure);
if (baseValue.asCell()->structure(vm) != newStructure)
return GiveUpOnCache;
ASSERT(newStructure->previousID() == oldStructure);
ASSERT(!newStructure->isDictionary());
ASSERT(newStructure->isObject());
std::unique_ptr<PolyProtoAccessChain> prototypeAccessChain;
ObjectPropertyConditionSet conditionSet;
if (putKind == PutKind::NotDirect) {
auto cacheStatus = prepareChainForCaching(globalObject, baseCell, nullptr);
if (!cacheStatus)
return GiveUpOnCache;
if (cacheStatus->usesPolyProto) {
prototypeAccessChain = PolyProtoAccessChain::create(globalObject, baseCell, nullptr);
if (!prototypeAccessChain)
return GiveUpOnCache;
} else {
prototypeAccessChain = nullptr;
conditionSet = generateConditionsForPropertySetterMiss(
vm, codeBlock, globalObject, newStructure, ident.impl());
if (!conditionSet.isValid())
return GiveUpOnCache;
}
}
if (putKind == PutKind::DirectPrivateFieldDefine) {
ASSERT(ident.isPrivateName());
conditionSet = generateConditionsForPropertyMiss(vm, codeBlock, globalObject, newStructure, ident.impl());
if (!conditionSet.isValid())
return GiveUpOnCache;
}
newCase = AccessCase::createTransition(vm, codeBlock, propertyName, offset, oldStructure, newStructure, conditionSet, WTFMove(prototypeAccessChain));
}
} else if (slot.isCacheableCustom() || slot.isCacheableSetter()) {
if (slot.isCacheableCustom()) {
ObjectPropertyConditionSet conditionSet;
std::unique_ptr<PolyProtoAccessChain> prototypeAccessChain;
// We need to do this even if we're a self custom, since we must disallow dictionaries
// because we need to be informed if the custom goes away since we cache the constant
// function pointer.
auto cacheStatus = prepareChainForCaching(globalObject, baseCell, slot.base());
if (!cacheStatus)
return GiveUpOnCache;
if (slot.base() != baseValue) {
if (cacheStatus->usesPolyProto) {
prototypeAccessChain = PolyProtoAccessChain::create(globalObject, baseCell, slot.base());
if (!prototypeAccessChain)
return GiveUpOnCache;
} else {
prototypeAccessChain = nullptr;
conditionSet = generateConditionsForPrototypePropertyHitCustom(
vm, codeBlock, globalObject, oldStructure, slot.base(), ident.impl(), static_cast<unsigned>(PropertyAttribute::None));
if (!conditionSet.isValid())
return GiveUpOnCache;
}
}
newCase = GetterSetterAccessCase::create(
vm, codeBlock, slot.isCustomAccessor() ? AccessCase::CustomAccessorSetter : AccessCase::CustomValueSetter, oldStructure, propertyName,
invalidOffset, conditionSet, WTFMove(prototypeAccessChain), isProxy, slot.customSetter().retagged<CustomAccessorPtrTag>(), slot.base() != baseValue ? slot.base() : nullptr);
} else {
ASSERT(slot.isCacheableSetter());
ObjectPropertyConditionSet conditionSet;
std::unique_ptr<PolyProtoAccessChain> prototypeAccessChain;
PropertyOffset offset = slot.cachedOffset();
if (slot.base() != baseValue) {
auto cacheStatus = prepareChainForCaching(globalObject, baseCell, slot.base());
if (!cacheStatus)
return GiveUpOnCache;
if (cacheStatus->flattenedDictionary)
return RetryCacheLater;
if (cacheStatus->usesPolyProto) {
prototypeAccessChain = PolyProtoAccessChain::create(globalObject, baseCell, slot.base());
if (!prototypeAccessChain)
return GiveUpOnCache;
unsigned attributes;
offset = prototypeAccessChain->slotBaseStructure(vm, baseCell->structure(vm))->get(vm, ident.impl(), attributes);
if (!isValidOffset(offset) || !(attributes & PropertyAttribute::Accessor))
return RetryCacheLater;
} else {
prototypeAccessChain = nullptr;
conditionSet = generateConditionsForPrototypePropertyHit(
vm, codeBlock, globalObject, oldStructure, slot.base(), ident.impl());
if (!conditionSet.isValid())
return GiveUpOnCache;
if (!(conditionSet.slotBaseCondition().attributes() & PropertyAttribute::Accessor))
return GiveUpOnCache;
offset = conditionSet.slotBaseCondition().offset();
}
}
newCase = GetterSetterAccessCase::create(
vm, codeBlock, AccessCase::Setter, oldStructure, propertyName, offset, conditionSet, WTFMove(prototypeAccessChain), isProxy);
}
}
LOG_IC((ICEvent::PutByIdAddAccessCase, oldStructure->classInfo(), ident, slot.base() == baseValue));
result = stubInfo.addAccessCase(locker, globalObject, codeBlock, slot.isStrictMode() ? ECMAMode::strict() : ECMAMode::sloppy(), propertyName, WTFMove(newCase));
if (result.generatedSomeCode()) {
LOG_IC((ICEvent::PutByIdReplaceWithJump, oldStructure->classInfo(), ident, slot.base() == baseValue));
RELEASE_ASSERT(result.code());
InlineAccess::rewireStubAsJump(stubInfo, CodeLocationLabel<JITStubRoutinePtrTag>(result.code()));
}
}
fireWatchpointsAndClearStubIfNeeded(vm, stubInfo, codeBlock, result);
return result.shouldGiveUpNow() ? GiveUpOnCache : RetryCacheLater;
}
void repatchPutByID(JSGlobalObject* globalObject, CodeBlock* codeBlock, JSValue baseValue, Structure* oldStructure, CacheableIdentifier propertyName, const PutPropertySlot& slot, StructureStubInfo& stubInfo, PutKind putKind)
{
SuperSamplerScope superSamplerScope(false);
if (tryCachePutByID(globalObject, codeBlock, baseValue, oldStructure, propertyName, slot, stubInfo, putKind) == GiveUpOnCache)
ftlThunkAwareRepatchCall(codeBlock, stubInfo.slowPathCallLocation, appropriateGenericPutByIdFunction(slot, putKind));
}
static InlineCacheAction tryCacheDeleteBy(JSGlobalObject* globalObject, CodeBlock* codeBlock, DeletePropertySlot& slot, JSValue baseValue, Structure* oldStructure, CacheableIdentifier propertyName, StructureStubInfo& stubInfo, DelByKind, ECMAMode ecmaMode)
{
VM& vm = globalObject->vm();
AccessGenerationResult result;
{
GCSafeConcurrentJSLocker locker(codeBlock->m_lock, globalObject->vm().heap);
if (forceICFailure(globalObject))
return GiveUpOnCache;
ASSERT(oldStructure);
if (!baseValue.isObject() || !oldStructure->propertyAccessesAreCacheable() || oldStructure->isProxy())
return GiveUpOnCache;
if (!slot.isCacheableDelete())
return GiveUpOnCache;
if (baseValue.asCell()->structure()->isDictionary()) {
if (baseValue.asCell()->structure()->hasBeenFlattenedBefore())
return GiveUpOnCache;
jsCast<JSObject*>(baseValue)->flattenDictionaryObject(vm);
return RetryCacheLater;
}
if (oldStructure->isDictionary())
return RetryCacheLater;
std::unique_ptr<AccessCase> newCase;
if (slot.isDeleteHit()) {
PropertyOffset newOffset = invalidOffset;
Structure* newStructure = Structure::removePropertyTransitionFromExistingStructureConcurrently(oldStructure, propertyName.uid(), newOffset);
if (!newStructure)
return RetryCacheLater;
if (!newStructure->propertyAccessesAreCacheable() || newStructure->isDictionary())
return GiveUpOnCache;
ASSERT(newOffset == slot.cachedOffset());
ASSERT(newStructure->previousID() == oldStructure);
ASSERT(newStructure->transitionKind() == TransitionKind::PropertyDeletion);
ASSERT(newStructure->isObject());
ASSERT(isValidOffset(newOffset));
newCase = AccessCase::createDelete(vm, codeBlock, propertyName, newOffset, oldStructure, newStructure);
} else if (slot.isNonconfigurable()) {
if (ecmaMode.isStrict())
return GiveUpOnCache;
newCase = AccessCase::create(vm, codeBlock, AccessCase::DeleteNonConfigurable, propertyName, invalidOffset, oldStructure, { }, nullptr);
} else
newCase = AccessCase::create(vm, codeBlock, AccessCase::DeleteMiss, propertyName, invalidOffset, oldStructure, { }, nullptr);
result = stubInfo.addAccessCase(locker, globalObject, codeBlock, ecmaMode, propertyName, WTFMove(newCase));
if (result.generatedSomeCode()) {
RELEASE_ASSERT(result.code());
LOG_IC((ICEvent::DelByReplaceWithJump, oldStructure->classInfo(), Identifier::fromUid(vm, propertyName.uid())));
InlineAccess::rewireStubAsJump(stubInfo, CodeLocationLabel<JITStubRoutinePtrTag>(result.code()));
}
}
fireWatchpointsAndClearStubIfNeeded(vm, stubInfo, codeBlock, result);
return result.shouldGiveUpNow() ? GiveUpOnCache : RetryCacheLater;
}
void repatchDeleteBy(JSGlobalObject* globalObject, CodeBlock* codeBlock, DeletePropertySlot& slot, JSValue baseValue, Structure* oldStructure, CacheableIdentifier propertyName, StructureStubInfo& stubInfo, DelByKind kind, ECMAMode ecmaMode)
{
SuperSamplerScope superSamplerScope(false);
VM& vm = globalObject->vm();
if (tryCacheDeleteBy(globalObject, codeBlock, slot, baseValue, oldStructure, propertyName, stubInfo, kind, ecmaMode) == GiveUpOnCache) {
LOG_IC((ICEvent::DelByReplaceWithGeneric, baseValue.classInfoOrNull(globalObject->vm()), Identifier::fromUid(vm, propertyName.uid())));
if (kind == DelByKind::Normal)
ftlThunkAwareRepatchCall(codeBlock, stubInfo.slowPathCallLocation, operationDeleteByIdGeneric);
else
ftlThunkAwareRepatchCall(codeBlock, stubInfo.slowPathCallLocation, operationDeleteByValGeneric);
}
}
static InlineCacheAction tryCacheInByID(
JSGlobalObject* globalObject, CodeBlock* codeBlock, JSObject* base, CacheableIdentifier propertyName,
bool wasFound, const PropertySlot& slot, StructureStubInfo& stubInfo)
{
VM& vm = globalObject->vm();
AccessGenerationResult result;
Identifier ident = Identifier::fromUid(vm, propertyName.uid());
{
GCSafeConcurrentJSLocker locker(codeBlock->m_lock, vm.heap);
if (forceICFailure(globalObject))
return GiveUpOnCache;
if (!base->structure(vm)->propertyAccessesAreCacheable() || (!wasFound && !base->structure(vm)->propertyAccessesAreCacheableForAbsence()))
return GiveUpOnCache;
if (wasFound) {
if (!slot.isCacheable())
return GiveUpOnCache;
}
Structure* structure = base->structure(vm);
std::unique_ptr<PolyProtoAccessChain> prototypeAccessChain;
ObjectPropertyConditionSet conditionSet;
if (wasFound) {
InlineCacheAction action = actionForCell(vm, base);
if (action != AttemptToCache)
return action;
// Optimize self access.
if (stubInfo.cacheType() == CacheType::Unset
&& slot.isCacheableValue()
&& slot.slotBase() == base
&& !slot.watchpointSet()
&& !structure->needImpurePropertyWatchpoint()) {
bool generatedCodeInline = InlineAccess::generateSelfInAccess(stubInfo, structure);
if (generatedCodeInline) {
LOG_IC((ICEvent::InByIdSelfPatch, structure->classInfo(), ident, slot.slotBase() == base));
structure->startWatchingPropertyForReplacements(vm, slot.cachedOffset());
ftlThunkAwareRepatchCall(codeBlock, stubInfo.slowPathCallLocation, operationInByIdOptimize);
stubInfo.initInByIdSelf(locker, codeBlock, structure, slot.cachedOffset(), propertyName);
return RetryCacheLater;
}
}
if (slot.slotBase() != base) {
auto cacheStatus = prepareChainForCaching(globalObject, base, slot);
if (!cacheStatus)
return GiveUpOnCache;
if (cacheStatus->flattenedDictionary)
return RetryCacheLater;
if (cacheStatus->usesPolyProto) {
prototypeAccessChain = PolyProtoAccessChain::create(globalObject, base, slot);
if (!prototypeAccessChain)
return GiveUpOnCache;
RELEASE_ASSERT(slot.isCacheableCustom() || prototypeAccessChain->slotBaseStructure(vm, structure)->get(vm, propertyName.uid()) == slot.cachedOffset());
} else {
prototypeAccessChain = nullptr;
conditionSet = generateConditionsForPrototypePropertyHit(
vm, codeBlock, globalObject, structure, slot.slotBase(), ident.impl());
if (!conditionSet.isValid())
return GiveUpOnCache;
RELEASE_ASSERT(slot.isCacheableCustom() || conditionSet.slotBaseCondition().offset() == slot.cachedOffset());
}
}
} else {
auto cacheStatus = prepareChainForCaching(globalObject, base, nullptr);
if (!cacheStatus)
return GiveUpOnCache;
if (cacheStatus->usesPolyProto) {
prototypeAccessChain = PolyProtoAccessChain::create(globalObject, base, slot);
if (!prototypeAccessChain)
return GiveUpOnCache;
} else {
prototypeAccessChain = nullptr;
conditionSet = generateConditionsForPropertyMiss(
vm, codeBlock, globalObject, structure, ident.impl());
if (!conditionSet.isValid())
return GiveUpOnCache;
}
}
LOG_IC((ICEvent::InAddAccessCase, structure->classInfo(), ident, slot.slotBase() == base));
std::unique_ptr<AccessCase> newCase = AccessCase::create(
vm, codeBlock, wasFound ? AccessCase::InHit : AccessCase::InMiss, propertyName, wasFound ? slot.cachedOffset() : invalidOffset, structure, conditionSet, WTFMove(prototypeAccessChain));
result = stubInfo.addAccessCase(locker, globalObject, codeBlock, ECMAMode::strict(), propertyName, WTFMove(newCase));
if (result.generatedSomeCode()) {
LOG_IC((ICEvent::InReplaceWithJump, structure->classInfo(), ident, slot.slotBase() == base));
RELEASE_ASSERT(result.code());
InlineAccess::rewireStubAsJump(stubInfo, CodeLocationLabel<JITStubRoutinePtrTag>(result.code()));
}
}
fireWatchpointsAndClearStubIfNeeded(vm, stubInfo, codeBlock, result);
return result.shouldGiveUpNow() ? GiveUpOnCache : RetryCacheLater;
}
void repatchInByID(JSGlobalObject* globalObject, CodeBlock* codeBlock, JSObject* baseObject, CacheableIdentifier propertyName, bool wasFound, const PropertySlot& slot, StructureStubInfo& stubInfo)