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/*
* Copyright (C) 2013-2025 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 "JITOperations.h"
WTF_ALLOW_UNSAFE_BUFFER_USAGE_BEGIN
#if ENABLE(JIT)
#include "ArithProfile.h"
#include "ArrayConstructor.h"
#include "CacheableIdentifierInlines.h"
#include "CodeBlockInlines.h"
#include "CommonSlowPathsInlines.h"
#include "DFGDriver.h"
#include "DFGOSREntry.h"
#include "DFGThunks.h"
#include "Debugger.h"
#include "EnsureStillAliveHere.h"
#include "ExceptionFuzz.h"
#include "FrameTracers.h"
#include "GetterSetter.h"
#include "ICStats.h"
#include "InlineCacheCompiler.h"
#include "Interpreter.h"
#include "JIT.h"
#include "JITExceptions.h"
#include "JITThunks.h"
#include "JITToDFGDeferredCompilationCallback.h"
#include "JITWorklist.h"
#include "JSArrayIterator.h"
#include "JSAsyncFunction.h"
#include "JSAsyncFunctionGenerator.h"
#include "JSAsyncGenerator.h"
#include "JSAsyncGeneratorFunction.h"
#include "JSBoundFunction.h"
#include "JSCInlines.h"
#include "JSCPtrTag.h"
#include "JSGeneratorFunction.h"
#include "JSGlobalObjectFunctions.h"
#include "JSLexicalEnvironmentInlines.h"
#include "JSMapIterator.h"
#include "JSPromise.h"
#include "JSRemoteFunction.h"
#include "JSSentinel.h"
#include "JSSetIterator.h"
#include "JSStringIteratorInlines.h"
#include "JSWithScope.h"
#include "JumpTable.h"
#include "LLIntEntrypoint.h"
#include "MegamorphicCache.h"
#include "ObjectConstructor.h"
#include "PropertyInlineCache.h"
#include "PropertyName.h"
#include "PropertyNameInlines.h"
#include "RegExpObject.h"
#include "RepatchInlines.h"
#include "ShadowChicken.h"
#include "SuperSampler.h"
#include "ThunkGenerators.h"
#include "TypeProfilerLog.h"
#include "VMInlines.h"
#include "VMTrapsInlines.h"
IGNORE_WARNINGS_BEGIN("frame-address")
namespace JSC {
ALWAYS_INLINE ICSlowPathCallFrameTracer::ICSlowPathCallFrameTracer(VM& vm, CallFrame* callFrame, PropertyInlineCache* propertyCache)
#if ASSERT_ENABLED
: m_vm(vm)
#endif
{
UNUSED_PARAM(vm);
UNUSED_PARAM(callFrame);
ASSERT(callFrame);
ASSERT(reinterpret_cast<void*>(callFrame) < reinterpret_cast<void*>(vm.topEntryFrame));
assertStackPointerIsAligned();
#if USE(BUILTIN_FRAME_ADDRESS)
// If ASSERT_ENABLED and USE(BUILTIN_FRAME_ADDRESS), prepareCallOperation() will put the frame pointer into vm.topCallFrame.
// We can ensure here that a call to prepareCallOperation() (or its equivalent) is not missing by comparing vm.topCallFrame to
// the result of __builtin_frame_address which is passed in as callFrame.
ASSERT(vm.topCallFrame == callFrame);
vm.topCallFrame = callFrame;
#endif
callFrame->setCallSiteIndex(propertyCache->callSiteIndex);
}
ALWAYS_INLINE JSValue profiledAdd(JSGlobalObject* globalObject, JSValue op1, JSValue op2, BinaryArithProfile& arithProfile)
{
arithProfile.observeLHSAndRHS(op1, op2);
JSValue result = jsAdd(globalObject, op1, op2);
arithProfile.observeResult(result);
return result;
}
JSC_DEFINE_NOEXCEPT_JIT_OPERATION(operationThrowStackOverflowError, void, (CodeBlock* codeBlock))
{
// We pass in our own code block, because the callframe hasn't been populated.
VM& vm = codeBlock->vm();
CallFrame* callFrame = DECLARE_CALL_FRAME(vm);
JITOperationPrologueCallFrameTracer tracer(vm, callFrame);
auto scope = DECLARE_THROW_SCOPE(vm);
callFrame->convertToZombieFrame(vm, codeBlock);
throwStackOverflowError(codeBlock->globalObject(), scope);
}
JSC_DEFINE_NOEXCEPT_JIT_OPERATION(operationThrowStackOverflowErrorFromThunk, void, (JSGlobalObject* globalObject))
{
VM& vm = globalObject->vm();
CallFrame* callFrame = DECLARE_CALL_FRAME(vm);
JITOperationPrologueCallFrameTracer tracer(vm, callFrame);
auto scope = DECLARE_THROW_SCOPE(vm);
throwStackOverflowError(globalObject, scope);
genericUnwind(vm, callFrame);
ASSERT(vm.targetMachinePCForThrow);
}
JSC_DEFINE_NOEXCEPT_JIT_OPERATION(operationThrowOutOfMemoryError, void, (VM* vmPointer))
{
VM& vm = *vmPointer;
CallFrame* callFrame = DECLARE_CALL_FRAME(vm);
JITOperationPrologueCallFrameTracer tracer(vm, callFrame);
auto scope = DECLARE_THROW_SCOPE(vm);
CodeBlock* codeBlock = callFrame->codeBlock();
if (JSC::JITCode::isOptimizingJIT(codeBlock->jitType()))
codeBlock = baselineCodeBlockForOriginAndBaselineCodeBlock(callFrame->codeOrigin(), codeBlock->baselineAlternative());
JSGlobalObject* globalObject = codeBlock->globalObject();
scope.throwException(globalObject, createOutOfMemoryError(globalObject));
}
static JSValue getWrappedValue(JSGlobalObject* globalObject, JSGlobalObject* targetGlobalObject, JSValue value)
{
VM& vm = globalObject->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
if (!value.isObject())
RELEASE_AND_RETURN(scope, value);
if (value.isCallable())
RELEASE_AND_RETURN(scope, JSRemoteFunction::tryCreate(targetGlobalObject, vm, static_cast<JSObject*>(value.asCell())));
throwTypeError(globalObject, scope, "value passing between realms must be callable or primitive"_s);
return jsUndefined();
}
JSC_DEFINE_JIT_OPERATION(operationGetWrappedValueForTarget, EncodedJSValue, (JSRemoteFunction* callee, EncodedJSValue encodedValue))
{
JSGlobalObject* globalObject = callee->realm();
VM& vm = globalObject->vm();
CallFrame* callFrame = DECLARE_CALL_FRAME(vm);
JITOperationPrologueCallFrameTracer tracer(vm, callFrame);
auto scope = DECLARE_THROW_SCOPE(vm);
ASSERT(isRemoteFunction(callee));
JSGlobalObject* targetGlobalObject = callee->targetFunction()->realm();
OPERATION_RETURN(scope, JSValue::encode(getWrappedValue(globalObject, targetGlobalObject, JSValue::decode(encodedValue))));
}
JSC_DEFINE_JIT_OPERATION(operationGetWrappedValueForCaller, EncodedJSValue, (JSRemoteFunction* callee, EncodedJSValue encodedValue))
{
JSGlobalObject* globalObject = callee->realm();
VM& vm = globalObject->vm();
CallFrame* callFrame = DECLARE_CALL_FRAME(vm);
JITOperationPrologueCallFrameTracer tracer(vm, callFrame);
auto scope = DECLARE_THROW_SCOPE(vm);
ASSERT(isRemoteFunction(callee));
OPERATION_RETURN(scope, JSValue::encode(getWrappedValue(globalObject, globalObject, JSValue::decode(encodedValue))));
}
static inline UGPRPair materializeTargetCode(VM& vm, JSFunction* targetFunction)
{
auto throwScope = DECLARE_THROW_SCOPE(vm);
ExecutableBase* executable = targetFunction->executable();
// Force the executable to cache its arity entrypoint.
{
DeferTraps deferTraps(vm); // We can't jettison any code until after we link the call.
CodeBlock* codeBlockSlot = nullptr;
if (!executable->isHostFunction()) {
JSScope* scope = targetFunction->scopeUnchecked();
FunctionExecutable* functionExecutable = static_cast<FunctionExecutable*>(executable);
functionExecutable->prepareForExecution<FunctionExecutable>(vm, targetFunction, scope, CodeSpecializationKind::CodeForCall, codeBlockSlot);
RETURN_IF_EXCEPTION(throwScope, encodeResult(nullptr, nullptr));
}
return encodeResult(executable->entrypointFor(CodeSpecializationKind::CodeForCall, ArityCheckMode::MustCheckArity).taggedPtr(), codeBlockSlot);
}
}
JSC_DEFINE_JIT_OPERATION(operationMaterializeBoundFunctionTargetCode, UGPRPair, (JSBoundFunction* callee))
{
JSGlobalObject* globalObject = callee->realm();
VM& vm = globalObject->vm();
CallFrame* callFrame = DECLARE_CALL_FRAME(vm);
JITOperationPrologueCallFrameTracer tracer(vm, callFrame);
auto scope = DECLARE_THROW_SCOPE(vm);
auto* targetFunction = uncheckedDowncast<JSFunction>(callee->targetFunction()); // We call this function only when JSBoundFunction's target is JSFunction.
OPERATION_RETURN(scope, materializeTargetCode(vm, targetFunction));
}
JSC_DEFINE_JIT_OPERATION(operationMaterializeRemoteFunctionTargetCode, UGPRPair, (JSRemoteFunction* callee))
{
JSGlobalObject* globalObject = callee->realm();
VM& vm = globalObject->vm();
CallFrame* callFrame = DECLARE_CALL_FRAME(vm);
JITOperationPrologueCallFrameTracer tracer(vm, callFrame);
auto scope = DECLARE_THROW_SCOPE(vm);
ASSERT(isRemoteFunction(callee));
auto* targetFunction = uncheckedDowncast<JSFunction>(callee->targetFunction()); // We call this function only when JSRemoteFunction's target is JSFunction.
OPERATION_RETURN(scope, materializeTargetCode(vm, targetFunction));
}
JSC_DEFINE_JIT_OPERATION(operationThrowRemoteFunctionException, EncodedJSValue, (JSRemoteFunction* callee))
{
JSGlobalObject* globalObject = callee->realm();
VM& vm = globalObject->vm();
CallFrame* callFrame = DECLARE_CALL_FRAME(vm);
JITOperationPrologueCallFrameTracer tracer(vm, callFrame);
auto scope = DECLARE_THROW_SCOPE(vm);
ASSERT(isRemoteFunction(callee));
Exception* exception = scope.exception();
// We should only be here when "rethrowing" an exception
RELEASE_ASSERT(exception);
JSValue exceptionValue = exception->value();
if (!scope.tryClearException()) [[unlikely]] {
scope.release();
OPERATION_RETURN(scope, encodedJSValue());
}
String exceptionString = exceptionValue.toWTFString(globalObject);
if (!scope.tryClearException()) [[unlikely]] {
scope.release();
OPERATION_RETURN(scope, encodedJSValue());
}
if (exceptionString.length())
OPERATION_RETURN(scope, throwVMTypeError(globalObject, scope, exceptionString));
OPERATION_RETURN(scope, throwVMTypeError(globalObject, scope));
}
JSC_DEFINE_JIT_OPERATION(operationThrowIteratorResultIsNotObject, void, (JSGlobalObject* globalObject))
{
VM& vm = globalObject->vm();
CallFrame* callFrame = DECLARE_CALL_FRAME(vm);
JITOperationPrologueCallFrameTracer tracer(vm, callFrame);
auto scope = DECLARE_THROW_SCOPE(vm);
throwTypeError(globalObject, scope, "Iterator result interface is not an object."_s);
OPERATION_RETURN(scope);
}
JSC_DEFINE_JIT_OPERATION(operationTryGetByIdGaveUp, EncodedJSValue, (EncodedJSValue base, PropertyInlineCache* propertyCache))
{
JSGlobalObject* globalObject = propertyCache->globalObject();
VM& vm = globalObject->vm();
CallFrame* callFrame = DECLARE_CALL_FRAME(vm);
ICSlowPathCallFrameTracer tracer(vm, callFrame, propertyCache);
auto scope = DECLARE_THROW_SCOPE(vm);
propertyCache->tookSlowPath = true;
CacheableIdentifier identifier = propertyCache->identifier();
JSValue baseValue = JSValue::decode(base);
PropertySlot slot(baseValue, PropertySlot::InternalMethodType::VMInquiry, &vm);
baseValue.getPropertySlot(globalObject, identifier, slot);
OPERATION_RETURN(scope, JSValue::encode(slot.getPureResult()));
}
JSC_DEFINE_JIT_OPERATION(operationTryGetByIdGeneric, EncodedJSValue, (JSGlobalObject* globalObject, EncodedJSValue base, uintptr_t rawCacheableIdentifier))
{
VM& vm = globalObject->vm();
CallFrame* callFrame = DECLARE_CALL_FRAME(vm);
JITOperationPrologueCallFrameTracer tracer(vm, callFrame);
auto scope = DECLARE_THROW_SCOPE(vm);
CacheableIdentifier identifier = CacheableIdentifier::createFromRawBits(rawCacheableIdentifier);
JSValue baseValue = JSValue::decode(base);
PropertySlot slot(baseValue, PropertySlot::InternalMethodType::VMInquiry, &vm);
baseValue.getPropertySlot(globalObject, identifier, slot);
OPERATION_RETURN(scope, JSValue::encode(slot.getPureResult()));
}
JSC_DEFINE_JIT_OPERATION(operationTryGetByIdOptimize, EncodedJSValue, (EncodedJSValue base, PropertyInlineCache* propertyCache))
{
JSGlobalObject* globalObject = propertyCache->globalObject();
VM& vm = globalObject->vm();
CallFrame* callFrame = DECLARE_CALL_FRAME(vm);
ICSlowPathCallFrameTracer tracer(vm, callFrame, propertyCache);
auto scope = DECLARE_THROW_SCOPE(vm);
CacheableIdentifier identifier = propertyCache->identifier();
JSValue baseValue = JSValue::decode(base);
PropertySlot slot(baseValue, PropertySlot::InternalMethodType::VMInquiry, &vm);
baseValue.getPropertySlot(globalObject, identifier, slot);
OPERATION_RETURN_IF_EXCEPTION(scope, encodedJSValue());
CodeBlock* codeBlock = callFrame->codeBlock();
if (propertyCache->considerRepatchingCacheBy(vm, codeBlock, baseValue.structureOrNull(), identifier) && !slot.isTaintedByOpaqueObject() && (slot.isCacheableValue() || slot.isCacheableGetter() || slot.isUnset()))
repatchGetBy(globalObject, codeBlock, baseValue, identifier, slot, *propertyCache, GetByKind::TryById, /* isNonStringPrimitiveKey */ false);
OPERATION_RETURN(scope, JSValue::encode(slot.getPureResult()));
}
JSC_DEFINE_JIT_OPERATION(operationGetByIdDirectGaveUp, EncodedJSValue, (EncodedJSValue base, PropertyInlineCache* propertyCache))
{
JSGlobalObject* globalObject = propertyCache->globalObject();
VM& vm = globalObject->vm();
CallFrame* callFrame = DECLARE_CALL_FRAME(vm);
ICSlowPathCallFrameTracer tracer(vm, callFrame, propertyCache);
auto scope = DECLARE_THROW_SCOPE(vm);
propertyCache->tookSlowPath = true;
CacheableIdentifier identifier = propertyCache->identifier();
JSValue baseValue = JSValue::decode(base);
PropertySlot slot(baseValue, PropertySlot::InternalMethodType::GetOwnProperty);
bool found = baseValue.getOwnPropertySlot(globalObject, identifier, slot);
OPERATION_RETURN_IF_EXCEPTION(scope, encodedJSValue());
OPERATION_RETURN(scope, JSValue::encode(found ? slot.getValue(globalObject, identifier) : jsUndefined()));
}
JSC_DEFINE_JIT_OPERATION(operationGetByIdDirectGeneric, EncodedJSValue, (JSGlobalObject* globalObject, EncodedJSValue base, uintptr_t rawCacheableIdentifier))
{
VM& vm = globalObject->vm();
CallFrame* callFrame = DECLARE_CALL_FRAME(vm);
JITOperationPrologueCallFrameTracer tracer(vm, callFrame);
auto scope = DECLARE_THROW_SCOPE(vm);
CacheableIdentifier identifier = CacheableIdentifier::createFromRawBits(rawCacheableIdentifier);
JSValue baseValue = JSValue::decode(base);
PropertySlot slot(baseValue, PropertySlot::InternalMethodType::GetOwnProperty);
bool found = baseValue.getOwnPropertySlot(globalObject, identifier, slot);
OPERATION_RETURN_IF_EXCEPTION(scope, encodedJSValue());
OPERATION_RETURN(scope, JSValue::encode(found ? slot.getValue(globalObject, identifier) : jsUndefined()));
}
JSC_DEFINE_JIT_OPERATION(operationGetByIdDirectOptimize, EncodedJSValue, (EncodedJSValue base, PropertyInlineCache* propertyCache))
{
JSGlobalObject* globalObject = propertyCache->globalObject();
VM& vm = globalObject->vm();
CallFrame* callFrame = DECLARE_CALL_FRAME(vm);
ICSlowPathCallFrameTracer tracer(vm, callFrame, propertyCache);
auto scope = DECLARE_THROW_SCOPE(vm);
CacheableIdentifier identifier = propertyCache->identifier();
JSValue baseValue = JSValue::decode(base);
PropertySlot slot(baseValue, PropertySlot::InternalMethodType::GetOwnProperty);
bool found = baseValue.getOwnPropertySlot(globalObject, identifier, slot);
OPERATION_RETURN_IF_EXCEPTION(scope, encodedJSValue());
CodeBlock* codeBlock = callFrame->codeBlock();
if (propertyCache->considerRepatchingCacheBy(vm, codeBlock, baseValue.structureOrNull(), identifier))
repatchGetBy(globalObject, codeBlock, baseValue, identifier, slot, *propertyCache, GetByKind::ByIdDirect, /* isNonStringPrimitiveKey */ false);
OPERATION_RETURN(scope, JSValue::encode(found ? slot.getValue(globalObject, identifier) : jsUndefined()));
}
static ALWAYS_INLINE JSValue getByIdMegamorphic(JSGlobalObject* globalObject, VM& vm, CallFrame* callFrame, PropertyInlineCache* propertyCache, JSValue baseValue, JSValue thisValue, CacheableIdentifier identifier, GetByKind kind)
{
auto* uid = identifier.uid();
PropertySlot slot(thisValue, PropertySlot::InternalMethodType::Get);
JSObject* baseObject = nullptr;
if (!baseValue.isObject()) [[unlikely]] {
if (!baseValue.isString()) [[unlikely]] {
if (propertyCache && propertyCache->considerRepatchingCacheMegamorphic(vm))
repatchGetBySlowPathCall(callFrame->codeBlock(), *propertyCache, kind);
return baseValue.get(globalObject, uid, slot);
}
baseObject = globalObject->stringPrototype();
} else
baseObject = asObject(baseValue);
JSObject* object = baseObject;
bool shouldGiveUp = false;
bool cacheable = true;
while (true) {
if (TypeInfo::overridesGetOwnPropertySlot(object->inlineTypeFlags()) && object->type() != ArrayType && object->type() != JSFunctionType && object->type() != DerivedStringObjectType && object != globalObject->arrayPrototype()) [[unlikely]] {
if (propertyCache && propertyCache->considerRepatchingCacheMegamorphic(vm))
repatchGetBySlowPathCall(callFrame->codeBlock(), *propertyCache, kind);
if (object->getNonIndexPropertySlot(globalObject, uid, slot))
return slot.getValue(globalObject, uid);
return jsUndefined();
}
Structure* structure = object->structure();
bool hasProperty = object->getOwnNonIndexPropertySlot(vm, structure, uid, slot);
structure = object->structure(); // Reload it again since static-class-table can cause transition. But this transition only affects on this Structure.
if (!structure->propertyAccessesAreCacheable()) {
shouldGiveUp = true;
cacheable = false;
}
if (hasProperty) {
if (cacheable && slot.isCacheableValue() && slot.cachedOffset() <= MegamorphicCache::maxOffset) [[likely]] {
if (slot.slotBase() == baseObject || !baseObject->structure()->isDictionary())
vm.megamorphicCache()->initAsHit(baseObject->structureID(), uid, slot.slotBase(), slot.cachedOffset(), slot.slotBase() == baseValue);
else {
if (baseObject->structure()->hasBeenFlattenedBefore()) [[unlikely]] {
if (propertyCache && propertyCache->considerRepatchingCacheMegamorphic(vm))
repatchGetBySlowPathCall(callFrame->codeBlock(), *propertyCache, kind);
}
}
} else {
if (shouldGiveUp && propertyCache && propertyCache->considerRepatchingCacheMegamorphic(vm))
repatchGetBySlowPathCall(callFrame->codeBlock(), *propertyCache, kind);
}
return slot.getValue(globalObject, uid);
}
if (!structure->propertyAccessesAreCacheableForAbsence()) {
shouldGiveUp = true;
cacheable = false;
}
cacheable &= structure->hasMonoProto();
JSValue prototype = object->getPrototypeDirect();
if (!prototype.isObject()) {
if (cacheable) [[likely]] {
if (!baseObject->structure()->isDictionary()) [[likely]] {
vm.megamorphicCache()->initAsMiss(baseObject->structureID(), uid);
return jsUndefined();
}
if (!baseObject->structure()->hasBeenFlattenedBefore()) [[likely]]
return jsUndefined();
}
if (shouldGiveUp && propertyCache && propertyCache->considerRepatchingCacheMegamorphic(vm))
repatchGetBySlowPathCall(callFrame->codeBlock(), *propertyCache, kind);
return jsUndefined();
}
object = asObject(prototype);
}
}
JSC_DEFINE_JIT_OPERATION(operationGetByIdMegamorphic, EncodedJSValue, (EncodedJSValue base, PropertyInlineCache* propertyCache))
{
JSGlobalObject* globalObject = propertyCache->globalObject();
VM& vm = globalObject->vm();
CallFrame* callFrame = DECLARE_CALL_FRAME(vm);
ICSlowPathCallFrameTracer tracer(vm, callFrame, propertyCache);
auto scope = DECLARE_THROW_SCOPE(vm);
JSValue baseValue = JSValue::decode(base);
CacheableIdentifier identifier = propertyCache->identifier();
OPERATION_RETURN(scope, JSValue::encode(getByIdMegamorphic(globalObject, vm, callFrame, propertyCache, baseValue, baseValue, identifier, GetByKind::ById)));
}
JSC_DEFINE_JIT_OPERATION(operationGetByIdMegamorphicGeneric, EncodedJSValue, (JSGlobalObject* globalObject, EncodedJSValue base, uintptr_t rawCacheableIdentifier))
{
VM& vm = globalObject->vm();
CallFrame* callFrame = DECLARE_CALL_FRAME(vm);
JITOperationPrologueCallFrameTracer tracer(vm, callFrame);
auto scope = DECLARE_THROW_SCOPE(vm);
JSValue baseValue = JSValue::decode(base);
CacheableIdentifier identifier = CacheableIdentifier::createFromRawBits(rawCacheableIdentifier);
OPERATION_RETURN(scope, JSValue::encode(getByIdMegamorphic(globalObject, vm, callFrame, nullptr, baseValue, baseValue, identifier, GetByKind::ById)));
}
JSC_DEFINE_JIT_OPERATION(operationGetByIdGaveUp, EncodedJSValue, (EncodedJSValue base, PropertyInlineCache* propertyCache))
{
SuperSamplerScope superSamplerScope(false);
JSGlobalObject* globalObject = propertyCache->globalObject();
VM& vm = globalObject->vm();
CallFrame* callFrame = DECLARE_CALL_FRAME(vm);
ICSlowPathCallFrameTracer tracer(vm, callFrame, propertyCache);
auto scope = DECLARE_THROW_SCOPE(vm);
propertyCache->tookSlowPath = true;
JSValue baseValue = JSValue::decode(base);
PropertySlot slot(baseValue, PropertySlot::InternalMethodType::Get);
CacheableIdentifier identifier = propertyCache->identifier();
JSValue result = baseValue.get(globalObject, identifier, slot);
LOG_IC((ICEvent::OperationGetByIdGaveUp, baseValue.classInfoOrNull(), baseValue == slot.slotBase()));
OPERATION_RETURN(scope, JSValue::encode(result));
}
JSC_DEFINE_JIT_OPERATION(operationGetByIdGeneric, EncodedJSValue, (JSGlobalObject* globalObject, EncodedJSValue base, uintptr_t rawCacheableIdentifier))
{
SuperSamplerScope superSamplerScope(false);
VM& vm = globalObject->vm();
CallFrame* callFrame = DECLARE_CALL_FRAME(vm);
JITOperationPrologueCallFrameTracer tracer(vm, callFrame);
auto scope = DECLARE_THROW_SCOPE(vm);
JSValue baseValue = JSValue::decode(base);
PropertySlot slot(baseValue, PropertySlot::InternalMethodType::Get);
CacheableIdentifier identifier = CacheableIdentifier::createFromRawBits(rawCacheableIdentifier);
JSValue result = baseValue.get(globalObject, identifier, slot);
LOG_IC((ICEvent::OperationGetByIdGeneric, baseValue.classInfoOrNull(), baseValue == slot.slotBase()));
OPERATION_RETURN(scope, JSValue::encode(result));
}
JSC_DEFINE_JIT_OPERATION(operationGetByIdOptimize, EncodedJSValue, (EncodedJSValue base, PropertyInlineCache* propertyCache))
{
SuperSamplerScope superSamplerScope(false);
JSGlobalObject* globalObject = propertyCache->globalObject();
VM& vm = globalObject->vm();
CallFrame* callFrame = DECLARE_CALL_FRAME(vm);
ICSlowPathCallFrameTracer tracer(vm, callFrame, propertyCache);
auto scope = DECLARE_THROW_SCOPE(vm);
CacheableIdentifier identifier = propertyCache->identifier();
JSValue baseValue = JSValue::decode(base);
OPERATION_RETURN(scope, JSValue::encode(baseValue.getPropertySlot(globalObject, identifier, [&] (bool found, PropertySlot& slot) -> JSValue {
LOG_IC((ICEvent::OperationGetByIdOptimize, baseValue.classInfoOrNull(), baseValue == slot.slotBase()));
CodeBlock* codeBlock = callFrame->codeBlock();
if (propertyCache->considerRepatchingCacheBy(vm, codeBlock, baseValue.structureOrNull(), identifier))
repatchGetBy(globalObject, codeBlock, baseValue, identifier, slot, *propertyCache, GetByKind::ById, /* isNonStringPrimitiveKey */ false);
return found ? slot.getValue(globalObject, identifier) : jsUndefined();
})));
}
JSC_DEFINE_JIT_OPERATION(operationGetByIdWithThisGaveUp, EncodedJSValue, (EncodedJSValue base, EncodedJSValue thisEncoded, PropertyInlineCache* propertyCache))
{
SuperSamplerScope superSamplerScope(false);
JSGlobalObject* globalObject = propertyCache->globalObject();
VM& vm = globalObject->vm();
CallFrame* callFrame = DECLARE_CALL_FRAME(vm);
ICSlowPathCallFrameTracer tracer(vm, callFrame, propertyCache);
auto scope = DECLARE_THROW_SCOPE(vm);
propertyCache->tookSlowPath = true;
CacheableIdentifier identifier = propertyCache->identifier();
JSValue baseValue = JSValue::decode(base);
JSValue thisValue = JSValue::decode(thisEncoded);
PropertySlot slot(thisValue, PropertySlot::InternalMethodType::Get);
JSValue result = baseValue.get(globalObject, identifier, slot);
LOG_IC((ICEvent::OperationGetByIdWithThisGaveUp, baseValue.classInfoOrNull(), baseValue == slot.slotBase()));
OPERATION_RETURN(scope, JSValue::encode(result));
}
JSC_DEFINE_JIT_OPERATION(operationGetByIdWithThisGeneric, EncodedJSValue, (JSGlobalObject* globalObject, EncodedJSValue base, EncodedJSValue thisEncoded, uintptr_t rawCacheableIdentifier))
{
SuperSamplerScope superSamplerScope(false);
VM& vm = globalObject->vm();
CallFrame* callFrame = DECLARE_CALL_FRAME(vm);
JITOperationPrologueCallFrameTracer tracer(vm, callFrame);
auto scope = DECLARE_THROW_SCOPE(vm);
CacheableIdentifier identifier = CacheableIdentifier::createFromRawBits(rawCacheableIdentifier);
JSValue baseValue = JSValue::decode(base);
JSValue thisValue = JSValue::decode(thisEncoded);
PropertySlot slot(thisValue, PropertySlot::InternalMethodType::Get);
JSValue result = baseValue.get(globalObject, identifier, slot);
LOG_IC((ICEvent::OperationGetByIdWithThisGeneric, baseValue.classInfoOrNull(), baseValue == slot.slotBase()));
OPERATION_RETURN(scope, JSValue::encode(result));
}
JSC_DEFINE_JIT_OPERATION(operationGetByIdWithThisOptimize, EncodedJSValue, (EncodedJSValue base, EncodedJSValue thisEncoded, PropertyInlineCache* propertyCache))
{
SuperSamplerScope superSamplerScope(false);
JSGlobalObject* globalObject = propertyCache->globalObject();
VM& vm = globalObject->vm();
CallFrame* callFrame = DECLARE_CALL_FRAME(vm);
ICSlowPathCallFrameTracer tracer(vm, callFrame, propertyCache);
auto scope = DECLARE_THROW_SCOPE(vm);
CacheableIdentifier identifier = propertyCache->identifier();
JSValue baseValue = JSValue::decode(base);
JSValue thisValue = JSValue::decode(thisEncoded);
PropertySlot slot(thisValue, PropertySlot::InternalMethodType::Get);
OPERATION_RETURN(scope, JSValue::encode(baseValue.getPropertySlot(globalObject, identifier, slot, [&] (bool found, PropertySlot& slot) -> JSValue {
LOG_IC((ICEvent::OperationGetByIdWithThisOptimize, baseValue.classInfoOrNull(), baseValue == slot.slotBase()));
CodeBlock* codeBlock = callFrame->codeBlock();
if (propertyCache->considerRepatchingCacheBy(vm, codeBlock, baseValue.structureOrNull(), identifier))
repatchGetBy(globalObject, codeBlock, baseValue, identifier, slot, *propertyCache, GetByKind::ByIdWithThis, /* isNonStringPrimitiveKey */ false);
return found ? slot.getValue(globalObject, identifier) : jsUndefined();
})));
}
JSC_DEFINE_JIT_OPERATION(operationGetByIdWithThisMegamorphic, EncodedJSValue, (EncodedJSValue base, EncodedJSValue encodedThis, PropertyInlineCache* propertyCache))
{
JSGlobalObject* globalObject = propertyCache->globalObject();
VM& vm = globalObject->vm();
CallFrame* callFrame = DECLARE_CALL_FRAME(vm);
ICSlowPathCallFrameTracer tracer(vm, callFrame, propertyCache);
auto scope = DECLARE_THROW_SCOPE(vm);
CacheableIdentifier identifier = propertyCache->identifier();
OPERATION_RETURN(scope, JSValue::encode(getByIdMegamorphic(globalObject, vm, callFrame, propertyCache, JSValue::decode(base), JSValue::decode(encodedThis), identifier, GetByKind::ByIdWithThis)));
}
JSC_DEFINE_JIT_OPERATION(operationGetByIdWithThisMegamorphicGeneric, EncodedJSValue, (JSGlobalObject* globalObject, EncodedJSValue base, EncodedJSValue encodedThis, uintptr_t rawCacheableIdentifier))
{
VM& vm = globalObject->vm();
CallFrame* callFrame = DECLARE_CALL_FRAME(vm);
JITOperationPrologueCallFrameTracer tracer(vm, callFrame);
auto scope = DECLARE_THROW_SCOPE(vm);
CacheableIdentifier identifier = CacheableIdentifier::createFromRawBits(rawCacheableIdentifier);
OPERATION_RETURN(scope, JSValue::encode(getByIdMegamorphic(globalObject, vm, callFrame, nullptr, JSValue::decode(base), JSValue::decode(encodedThis), identifier, GetByKind::ByIdWithThis)));
}
JSC_DEFINE_JIT_OPERATION(operationInByIdGaveUp, EncodedJSValue, (EncodedJSValue base, PropertyInlineCache* propertyCache))
{
SuperSamplerScope superSamplerScope(false);
JSGlobalObject* globalObject = propertyCache->globalObject();
VM& vm = globalObject->vm();
CallFrame* callFrame = DECLARE_CALL_FRAME(vm);
ICSlowPathCallFrameTracer tracer(vm, callFrame, propertyCache);
auto scope = DECLARE_THROW_SCOPE(vm);
propertyCache->tookSlowPath = true;
CacheableIdentifier identifier = propertyCache->identifier();
JSValue baseValue = JSValue::decode(base);
if (!baseValue.isObject()) {
throwException(globalObject, scope, createInvalidInParameterError(globalObject, baseValue));
OPERATION_RETURN(scope, JSValue::encode(jsUndefined()));
}
JSObject* baseObject = asObject(baseValue);
LOG_IC((ICEvent::OperationInByIdGeneric, baseObject->classInfo()));
scope.release();
PropertySlot slot(baseObject, PropertySlot::InternalMethodType::HasProperty);
OPERATION_RETURN(scope, JSValue::encode(jsBoolean(baseObject->getPropertySlot(globalObject, identifier, slot))));
}
JSC_DEFINE_JIT_OPERATION(operationInByIdOptimize, EncodedJSValue, (EncodedJSValue base, PropertyInlineCache* propertyCache))
{
SuperSamplerScope superSamplerScope(false);
JSGlobalObject* globalObject = propertyCache->globalObject();
VM& vm = globalObject->vm();
CallFrame* callFrame = DECLARE_CALL_FRAME(vm);
ICSlowPathCallFrameTracer tracer(vm, callFrame, propertyCache);
auto scope = DECLARE_THROW_SCOPE(vm);
CacheableIdentifier identifier = propertyCache->identifier();
JSValue baseValue = JSValue::decode(base);
if (!baseValue.isObject()) {
throwException(globalObject, scope, createInvalidInParameterError(globalObject, baseValue));
OPERATION_RETURN(scope, JSValue::encode(jsUndefined()));
}
JSObject* baseObject = asObject(baseValue);
LOG_IC((ICEvent::OperationInByIdOptimize, baseObject->classInfo()));
PropertySlot slot(baseObject, PropertySlot::InternalMethodType::HasProperty);
bool found = baseObject->getPropertySlot(globalObject, identifier, slot);
OPERATION_RETURN_IF_EXCEPTION(scope, encodedJSValue());
CodeBlock* codeBlock = callFrame->codeBlock();
if (propertyCache->considerRepatchingCacheBy(vm, codeBlock, baseObject->structure(), identifier))
repatchInBy(globalObject, codeBlock, baseObject, identifier, found, slot, *propertyCache, InByKind::ById);
OPERATION_RETURN(scope, JSValue::encode(jsBoolean(found)));
}
static ALWAYS_INLINE JSValue inByIdMegamorphic(JSGlobalObject* globalObject, VM& vm, CallFrame* callFrame, PropertyInlineCache* propertyCache, JSValue baseValue, CacheableIdentifier identifier)
{
constexpr bool verbose = false;
auto scope = DECLARE_THROW_SCOPE(vm);
auto* uid = identifier.uid();
PropertySlot slot(baseValue, PropertySlot::InternalMethodType::HasProperty);
if (!baseValue.isObject()) [[unlikely]] {
if (propertyCache && propertyCache->considerRepatchingCacheMegamorphic(vm)) {
dataLogLnIf(verbose, " ", __LINE__);
repatchInBySlowPathCall(callFrame->codeBlock(), *propertyCache, InByKind::ById);
}
throwException(globalObject, scope, createInvalidInParameterError(globalObject, baseValue));
return jsUndefined();
}
JSObject* baseObject = asObject(baseValue);
JSObject* object = baseObject;
bool shouldGiveUp = false;
bool cacheable = true;
while (true) {
if (TypeInfo::overridesGetOwnPropertySlot(object->inlineTypeFlags()) && object->type() != ArrayType && object->type() != JSFunctionType && object != globalObject->arrayPrototype()) [[unlikely]] {
if (propertyCache && propertyCache->considerRepatchingCacheMegamorphic(vm)) {
dataLogLnIf(verbose, " ", __LINE__);
repatchInBySlowPathCall(callFrame->codeBlock(), *propertyCache, InByKind::ById);
}
RELEASE_AND_RETURN(scope, jsBoolean(object->getNonIndexPropertySlot(globalObject, uid, slot)));
}
Structure* structure = object->structure();
bool hasProperty = object->getOwnNonIndexPropertySlot(vm, structure, uid, slot);
structure = object->structure(); // Reload it again since static-class-table can cause transition. But this transition only affects on this Structure.
if (!structure->propertyAccessesAreCacheable()) {
shouldGiveUp = true;
cacheable = false;
}
if (hasProperty) {
if (cacheable && slot.isCacheable()) [[likely]] {
if (slot.slotBase() == baseObject || !baseObject->structure()->isDictionary())
vm.megamorphicCache()->initAsHasHit(baseObject->structureID(), uid);
else {
if (baseObject->structure()->hasBeenFlattenedBefore()) [[unlikely]] {
if (shouldGiveUp && propertyCache && propertyCache->considerRepatchingCacheMegamorphic(vm)) {
dataLogLnIf(verbose, " ", __LINE__);
repatchInBySlowPathCall(callFrame->codeBlock(), *propertyCache, InByKind::ById);
}
}
dataLogLnIf(verbose, " ", __LINE__);
}
} else {
if (shouldGiveUp && propertyCache && propertyCache->considerRepatchingCacheMegamorphic(vm)) {
dataLogLnIf(verbose, " ", __LINE__);
repatchInBySlowPathCall(callFrame->codeBlock(), *propertyCache, InByKind::ById);
}
}
return jsBoolean(true);
}
if (!structure->propertyAccessesAreCacheableForAbsence()) {
shouldGiveUp = true;
cacheable = false;
}
cacheable &= structure->hasMonoProto();
JSValue prototype = object->getPrototypeDirect();
if (!prototype.isObject()) {
if (cacheable) [[likely]] {
if (!baseObject->structure()->isDictionary()) [[likely]] {
vm.megamorphicCache()->initAsHasMiss(baseObject->structureID(), uid);
return jsBoolean(false);
}
if (!baseObject->structure()->hasBeenFlattenedBefore()) [[likely]]
return jsBoolean(false);
}
if (shouldGiveUp && propertyCache && propertyCache->considerRepatchingCacheMegamorphic(vm)) {
dataLogLnIf(verbose, " ", __LINE__);
repatchInBySlowPathCall(callFrame->codeBlock(), *propertyCache, InByKind::ById);
}
return jsBoolean(false);
}
object = asObject(prototype);
}
}
JSC_DEFINE_JIT_OPERATION(operationInByIdMegamorphic, EncodedJSValue, (EncodedJSValue base, PropertyInlineCache* propertyCache))
{
JSGlobalObject* globalObject = propertyCache->globalObject();
VM& vm = globalObject->vm();
CallFrame* callFrame = DECLARE_CALL_FRAME(vm);
ICSlowPathCallFrameTracer tracer(vm, callFrame, propertyCache);
auto scope = DECLARE_THROW_SCOPE(vm);
JSValue baseValue = JSValue::decode(base);
CacheableIdentifier identifier = propertyCache->identifier();
OPERATION_RETURN(scope, JSValue::encode(inByIdMegamorphic(globalObject, vm, callFrame, propertyCache, baseValue, identifier)));
}
JSC_DEFINE_JIT_OPERATION(operationInByIdMegamorphicGeneric, EncodedJSValue, (JSGlobalObject* globalObject, EncodedJSValue base, uintptr_t rawCacheableIdentifier))
{
VM& vm = globalObject->vm();
CallFrame* callFrame = DECLARE_CALL_FRAME(vm);
JITOperationPrologueCallFrameTracer tracer(vm, callFrame);
auto scope = DECLARE_THROW_SCOPE(vm);
JSValue baseValue = JSValue::decode(base);
CacheableIdentifier identifier = CacheableIdentifier::createFromRawBits(rawCacheableIdentifier);
OPERATION_RETURN(scope, JSValue::encode(inByIdMegamorphic(globalObject, vm, callFrame, nullptr, baseValue, identifier)));
}
JSC_DEFINE_JIT_OPERATION(operationInByValOptimize, EncodedJSValue, (EncodedJSValue encodedBase, EncodedJSValue encodedKey, PropertyInlineCache* propertyCache, ArrayProfile* profile))
{
SuperSamplerScope superSamplerScope(false);
JSGlobalObject* globalObject = propertyCache->globalObject();
VM& vm = globalObject->vm();
CallFrame* callFrame = DECLARE_CALL_FRAME(vm);
ICSlowPathCallFrameTracer tracer(vm, callFrame, propertyCache);
auto scope = DECLARE_THROW_SCOPE(vm);
JSValue baseValue = JSValue::decode(encodedBase);
JSValue key = JSValue::decode(encodedKey);
if (!baseValue.isObject()) {
throwException(globalObject, scope, createInvalidInParameterError(globalObject, baseValue));
OPERATION_RETURN(scope, encodedJSValue());
}
JSObject* baseObject = asObject(baseValue);
uint32_t i;
if (key.getUInt32(i)) {
if (profile)
profile->observeIndexedRead(baseObject, i);
CodeBlock* codeBlock = callFrame->codeBlock();
Structure* structure = baseValue.asCell()->structure();
if (propertyCache->considerRepatchingCacheGeneric(vm, codeBlock, structure)) {
if (profile)
profile->computeUpdatedPrediction(codeBlock, structure);
repatchArrayInByVal(globalObject, codeBlock, baseValue, key, *propertyCache, InByKind::ByVal);
}
OPERATION_RETURN(scope, JSValue::encode(jsBoolean(baseObject->hasProperty(globalObject, i))));
}
const Identifier propertyName = key.toPropertyKey(globalObject);
OPERATION_RETURN_IF_EXCEPTION(scope, encodedJSValue());
PropertySlot slot(baseObject, PropertySlot::InternalMethodType::HasProperty);
bool found = baseObject->getPropertySlot(globalObject, propertyName, slot);
OPERATION_RETURN_IF_EXCEPTION(scope, encodedJSValue());
if (CacheableIdentifier::isCacheableIdentifierCell(key) && (key.isSymbol() || !parseIndex(propertyName))) {
CodeBlock* codeBlock = callFrame->codeBlock();
CacheableIdentifier identifier = CacheableIdentifier::createFromCell(key.asCell());
if (propertyCache->considerRepatchingCacheBy(vm, codeBlock, baseObject->structure(), identifier))
repatchInBy(globalObject, codeBlock, baseObject, identifier, found, slot, *propertyCache, InByKind::ByVal);
}
OPERATION_RETURN(scope, JSValue::encode(jsBoolean(found)));
}
JSC_DEFINE_JIT_OPERATION(operationInByValGaveUp, EncodedJSValue, (EncodedJSValue base, EncodedJSValue key, PropertyInlineCache* propertyCache, ArrayProfile* arrayProfile))
{
SuperSamplerScope superSamplerScope(false);
JSGlobalObject* globalObject = propertyCache->globalObject();
VM& vm = globalObject->vm();
CallFrame* callFrame = DECLARE_CALL_FRAME(vm);
ICSlowPathCallFrameTracer tracer(vm, callFrame, propertyCache);
auto scope = DECLARE_THROW_SCOPE(vm);
propertyCache->tookSlowPath = true;
OPERATION_RETURN(scope, JSValue::encode(jsBoolean(CommonSlowPaths::opInByVal(globalObject, JSValue::decode(base), JSValue::decode(key), arrayProfile))));
}
static ALWAYS_INLINE JSValue inByValMegamorphic(JSGlobalObject* globalObject, VM& vm, CallFrame* callFrame, PropertyInlineCache* propertyCache, ArrayProfile* profile, JSValue baseValue, JSValue subscript)
{
constexpr bool verbose = false;
auto scope = DECLARE_THROW_SCOPE(vm);
if (!baseValue.isObject() || !CacheableIdentifier::isCacheableIdentifierCell(subscript)) [[unlikely]] {
dataLogLnIf(verbose, " ", __LINE__);
if (propertyCache && propertyCache->considerRepatchingCacheMegamorphic(vm)) {
repatchInBySlowPathCall(callFrame->codeBlock(), *propertyCache, InByKind::ByVal);
}
RELEASE_AND_RETURN(scope, jsBoolean(CommonSlowPaths::opInByVal(globalObject, baseValue, subscript, profile)));
}
Identifier propertyName = subscript.toPropertyKey(globalObject);
RETURN_IF_EXCEPTION(scope, { });
JSObject* baseObject = asObject(baseValue);
UniquedStringImpl* uid = propertyName.impl();
if (!canUseMegamorphicInById(vm, uid)) [[unlikely]] {
dataLogLnIf(verbose, " ", __LINE__);
if (propertyCache && propertyCache->considerRepatchingCacheMegamorphic(vm)) {
repatchInBySlowPathCall(callFrame->codeBlock(), *propertyCache, InByKind::ByVal);
}
if (profile)
profile->observeStructure(baseObject->structure());
RELEASE_AND_RETURN(scope, jsBoolean(baseObject->hasProperty(globalObject, uid)));
}
PropertySlot slot(baseValue, PropertySlot::InternalMethodType::HasProperty);
JSObject* object = baseObject;
bool shouldGiveUp = false;
bool cacheable = true;
while (true) {
if (TypeInfo::overridesGetOwnPropertySlot(object->inlineTypeFlags()) && object->type() != ArrayType && object->type() != JSFunctionType && object != globalObject->arrayPrototype()) [[unlikely]] {
dataLogLnIf(verbose, " ", __LINE__);
if (propertyCache && propertyCache->considerRepatchingCacheMegamorphic(vm)) {
repatchInBySlowPathCall(callFrame->codeBlock(), *propertyCache, InByKind::ByVal);
}
RELEASE_AND_RETURN(scope, jsBoolean(object->getNonIndexPropertySlot(globalObject, uid, slot)));
}
Structure* structure = object->structure();
bool hasProperty = object->getOwnNonIndexPropertySlot(vm, structure, uid, slot);
structure = object->structure(); // Reload it again since static-class-table can cause transition. But this transition only affects on this Structure.
if (!structure->propertyAccessesAreCacheable()) {
cacheable = false;
shouldGiveUp = true;
}
if (hasProperty) {
if (cacheable && slot.isCacheable()) [[likely]] {
if (slot.slotBase() == baseObject || !baseObject->structure()->isDictionary())
vm.megamorphicCache()->initAsHasHit(baseObject->structureID(), uid);
else {
if (baseObject->structure()->hasBeenFlattenedBefore()) [[unlikely]] {
dataLogLnIf(verbose, " ", __LINE__);
if (shouldGiveUp && propertyCache && propertyCache->considerRepatchingCacheMegamorphic(vm)) {
repatchInBySlowPathCall(callFrame->codeBlock(), *propertyCache, InByKind::ByVal);
}
}
}
} else {
dataLogLnIf(verbose, " ", __LINE__);
if (shouldGiveUp && propertyCache && propertyCache->considerRepatchingCacheMegamorphic(vm)) {
repatchInBySlowPathCall(callFrame->codeBlock(), *propertyCache, InByKind::ByVal);
}
}
return jsBoolean(true);
}
if (!structure->propertyAccessesAreCacheableForAbsence()) {
cacheable = false;
shouldGiveUp = true;
}
cacheable &= structure->hasMonoProto();
JSValue prototype = object->getPrototypeDirect();
if (!prototype.isObject()) {
if (cacheable) [[likely]] {
if (!baseObject->structure()->isDictionary()) [[likely]] {
vm.megamorphicCache()->initAsHasMiss(baseObject->structureID(), uid);
return jsBoolean(false);
}
if (!baseObject->structure()->hasBeenFlattenedBefore()) [[likely]]
return jsBoolean(false);
}
dataLogLnIf(verbose, " ", __LINE__);