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JSObject.h
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1704 lines (1441 loc) · 73.6 KB
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/*
* Copyright (C) 1999-2001 Harri Porten (porten@kde.org)
* Copyright (C) 2001 Peter Kelly (pmk@post.com)
* Copyright (C) 2003-2024 Apple Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#pragma once
#include <JavaScriptCore/ArrayConventions.h>
#include <JavaScriptCore/ArrayStorage.h>
#include <JavaScriptCore/Butterfly.h>
#include <JavaScriptCore/CPU.h>
#include <JavaScriptCore/CagedBarrierPtr.h>
#include <JavaScriptCore/CallFrame.h>
#include <JavaScriptCore/ClassInfo.h>
#include <JavaScriptCore/CustomGetterSetter.h>
#include <JavaScriptCore/DOMAttributeGetterSetter.h>
#include <JavaScriptCore/DeletePropertySlot.h>
#include <JavaScriptCore/Heap.h>
#include <JavaScriptCore/IndexingHeaderInlines.h>
#include <JavaScriptCore/Intrinsic.h>
#include <JavaScriptCore/JSCast.h>
#include <JavaScriptCore/MathCommon.h>
#include <JavaScriptCore/PropertySlot.h>
#include <JavaScriptCore/PropertyStorage.h>
#include <JavaScriptCore/PutDirectIndexMode.h>
#include <JavaScriptCore/PutPropertySlot.h>
#include <JavaScriptCore/Structure.h>
#include <JavaScriptCore/StructureTransitionTable.h>
#include <wtf/StdLibExtras.h>
WTF_ALLOW_UNSAFE_BUFFER_USAGE_BEGIN
namespace JSC {
namespace DOMJIT {
class Signature;
}
inline JSCell* getJSFunction(JSValue); // Defined in JSObjectInlines.h
class ArrayProfile;
class Exception;
class GetterSetter;
class InternalFunction;
class JSFunction;
class JSString;
class LLIntOffsetsExtractor;
class MarkedBlock;
class ObjectInitializationScope;
class PropertyDescriptor;
class PropertyNameArrayBuilder;
class Structure;
class ThrowScope;
class VM;
struct HashTable;
struct HashTableValue;
JS_EXPORT_PRIVATE Exception* throwTypeError(JSGlobalObject*, ThrowScope&, const String&);
extern JS_EXPORT_PRIVATE const ASCIILiteral NonExtensibleObjectPropertyDefineError;
extern JS_EXPORT_PRIVATE const ASCIILiteral ReadonlyPropertyWriteError;
extern JS_EXPORT_PRIVATE const ASCIILiteral ReadonlyPropertyChangeError;
extern JS_EXPORT_PRIVATE const ASCIILiteral UnableToDeletePropertyError;
extern JS_EXPORT_PRIVATE const ASCIILiteral UnconfigurablePropertyChangeAccessMechanismError;
extern JS_EXPORT_PRIVATE const ASCIILiteral UnconfigurablePropertyChangeConfigurabilityError;
extern JS_EXPORT_PRIVATE const ASCIILiteral UnconfigurablePropertyChangeEnumerabilityError;
extern JS_EXPORT_PRIVATE const ASCIILiteral UnconfigurablePropertyChangeWritabilityError;
extern JS_EXPORT_PRIVATE const ASCIILiteral PrototypeValueCanOnlyBeAnObjectOrNullTypeError;
class JSFinalObject;
#if ASSERT_ENABLED
#define JS_EXPORT_PRIVATE_IF_ASSERT_ENABLED JS_EXPORT_PRIVATE
#else
#define JS_EXPORT_PRIVATE_IF_ASSERT_ENABLED
#endif
class JSObject : public JSCell {
friend class BatchedTransitionOptimizer;
friend class JIT;
friend class JSCell;
friend class JSFinalObject;
friend class JSObjectWithButterfly;
friend class MarkedBlock;
enum PutMode : uint8_t {
PutModePut,
PutModeDefineOwnProperty,
};
public:
using Base = JSCell;
DECLARE_VISIT_CHILDREN_WITH_MODIFIER(JS_EXPORT_PRIVATE);
JS_EXPORT_PRIVATE static size_t estimatedSize(JSCell*, VM&);
JS_EXPORT_PRIVATE static void analyzeHeap(JSCell*, HeapAnalyzer&);
JS_EXPORT_PRIVATE static String calculatedClassName(JSObject*);
// This is the fully virtual [[GetPrototypeOf]] internal function defined
// in the ECMAScript 6 specification. Use this when doing a [[GetPrototypeOf]]
// operation as dictated in the specification.
JSValue getPrototype(JSGlobalObject*);
JS_EXPORT_PRIVATE static JSValue getPrototype(JSObject*, JSGlobalObject*);
// This gets the prototype directly off of the structure. This does not do
// dynamic dispatch on the getPrototype method table method. It is not valid
// to use this when performing a [[GetPrototypeOf]] operation in the specification.
// It is valid to use though when you know that you want to directly get it
// without consulting the method table. This is akin to getting the [[Prototype]]
// internal field directly as described in the specification.
JSValue getPrototypeDirect() const;
// This sets the prototype without checking for cycles and without
// doing dynamic dispatch on [[SetPrototypeOf]] operation in the specification.
// It is not valid to use this when performing a [[SetPrototypeOf]] operation in
// the specification. It is valid to use though when you know that you want to directly
// set it without consulting the method table and when you definitely won't
// introduce a cycle in the prototype chain. This is akin to setting the
// [[Prototype]] internal field directly as described in the specification.
JS_EXPORT_PRIVATE void setPrototypeDirect(VM&, JSValue prototype);
private:
// This is OrdinarySetPrototypeOf in the specification. Section 9.1.2.1
// https://tc39.github.io/ecma262/#sec-ordinarysetprototypeof
JS_EXPORT_PRIVATE bool setPrototypeWithCycleCheck(VM&, JSGlobalObject*, JSValue prototype, bool shouldThrowIfCantSet);
public:
// This is the fully virtual [[SetPrototypeOf]] internal function defined
// in the ECMAScript 6 specification. Use this when doing a [[SetPrototypeOf]]
// operation as dictated in the specification.
bool setPrototype(VM&, JSGlobalObject*, JSValue prototype, bool shouldThrowIfCantSet = false);
JS_EXPORT_PRIVATE static bool setPrototype(JSObject*, JSGlobalObject*, JSValue prototype, bool shouldThrowIfCantSet);
inline bool mayInterceptIndexedAccesses();
inline JSValue get(JSGlobalObject*, PropertyName) const; // Defined in JSObjectInlines.h
inline JSValue get(JSGlobalObject*, unsigned propertyName) const; // Defined in JSObjectInlines.h
JSValue get(JSGlobalObject*, uint64_t propertyName) const;
template<typename T, typename PropertyNameType>
inline T getAs(JSGlobalObject*, PropertyNameType) const; // Defined in JSObjectInlines.h
template<bool checkNullStructure = false>
bool getPropertySlot(JSGlobalObject*, PropertyName, PropertySlot&);
bool getPropertySlot(JSGlobalObject*, unsigned propertyName, PropertySlot&);
bool getPropertySlot(JSGlobalObject*, uint64_t propertyName, PropertySlot&);
template<typename CallbackWhenNoException> typename std::invoke_result<CallbackWhenNoException, bool, PropertySlot&>::type getPropertySlot(JSGlobalObject*, PropertyName, CallbackWhenNoException) const;
template<typename CallbackWhenNoException> typename std::invoke_result<CallbackWhenNoException, bool, PropertySlot&>::type getPropertySlot(JSGlobalObject*, PropertyName, PropertySlot&, CallbackWhenNoException) const;
template<typename PropertyNameType> JSValue getIfPropertyExists(JSGlobalObject*, const PropertyNameType&);
bool noSideEffectMayHaveNonIndexProperty(VM&, PropertyName);
enum class SortMode { Default, Ascending };
template<SortMode mode = SortMode::Default, typename Functor>
void forEachOwnIndexedProperty(JSGlobalObject*, const Functor&);
private:
static bool getOwnPropertySlotImpl(JSObject*, JSGlobalObject*, PropertyName, PropertySlot&);
public:
JS_EXPORT_PRIVATE_IF_ASSERT_ENABLED static bool getOwnPropertySlot(JSObject*, JSGlobalObject*, PropertyName, PropertySlot&);
JS_EXPORT_PRIVATE static bool getOwnPropertySlotByIndex(JSObject*, JSGlobalObject*, unsigned propertyName, PropertySlot&);
bool getOwnPropertySlotInline(JSGlobalObject*, PropertyName, PropertySlot&);
// The key difference between this and getOwnPropertySlot is that getOwnPropertySlot
// currently returns incorrect results for the DOM window (with non-own properties)
// being returned. Once this is fixed we should migrate code & remove this method.
JS_EXPORT_PRIVATE bool getOwnPropertyDescriptor(JSGlobalObject*, PropertyName, PropertyDescriptor&);
static bool getPrivateFieldSlot(JSObject*, JSGlobalObject*, PropertyName, PropertySlot&);
inline bool hasPrivateField(JSGlobalObject*, PropertyName);
inline bool getPrivateField(JSGlobalObject*, PropertyName, PropertySlot&);
inline void setPrivateField(JSGlobalObject*, PropertyName, JSValue, PutPropertySlot&);
inline void definePrivateField(JSGlobalObject*, PropertyName, JSValue, PutPropertySlot&);
inline bool hasPrivateBrand(JSGlobalObject*, JSValue brand);
inline void checkPrivateBrand(JSGlobalObject*, JSValue brand);
inline void setPrivateBrand(JSGlobalObject*, JSValue brand);
unsigned getArrayLength() const
{
if (!hasIndexedProperties(indexingType()))
return 0;
return butterfly()->publicLength();
}
unsigned getVectorLength()
{
if (!hasIndexedProperties(indexingType()))
return 0;
return butterfly()->vectorLength();
}
inline bool canHaveExistingOwnIndexedGetterSetterProperties(); // Defined in RenderObjectInlines.h
// This is only valid after using canPerformFastPropertyEnumerationCommon().
// This code is not checking getOwnPropertySlot override etc.
inline unsigned canHaveExistingOwnIndexedProperties() const; // Defined in RenderObjectInlines.h
static bool putInlineForJSObject(JSCell*, JSGlobalObject*, PropertyName, JSValue, PutPropertySlot&);
JS_EXPORT_PRIVATE static bool put(JSCell*, JSGlobalObject*, PropertyName, JSValue, PutPropertySlot&);
static bool NODELETE mightBeSpecialProperty(VM&, JSType, UniquedStringImpl*);
JS_EXPORT_PRIVATE NEVER_INLINE static bool definePropertyOnReceiver(JSGlobalObject*, PropertyName, JSValue, PutPropertySlot&);
// putByIndex assumes that the receiver is this JSCell object.
JS_EXPORT_PRIVATE static bool putByIndex(JSCell*, JSGlobalObject*, unsigned propertyName, JSValue, bool shouldThrow);
// This performs the ECMAScript Set() operation.
ALWAYS_INLINE bool putByIndexInline(JSGlobalObject* globalObject, unsigned propertyName, JSValue value, bool shouldThrow)
{
VM& vm = getVM(globalObject);
if (trySetIndexQuickly(vm, propertyName, value))
return true;
return methodTable()->putByIndex(this, globalObject, propertyName, value, shouldThrow);
}
ALWAYS_INLINE bool putByIndexInline(JSGlobalObject* globalObject, uint64_t propertyName, JSValue value, bool shouldThrow)
{
VM& vm = getVM(globalObject);
if (propertyName <= MAX_ARRAY_INDEX) [[likely]]
return putByIndexInline(globalObject, static_cast<uint32_t>(propertyName), value, shouldThrow);
ASSERT(propertyName <= maxSafeInteger());
PutPropertySlot slot(this, shouldThrow);
return methodTable()->put(this, globalObject, Identifier::from(vm, propertyName), value, slot);
}
// This is similar to the putDirect* methods:
// - the prototype chain is not consulted
// - accessors are not called.
// - it will ignore extensibility and read-only properties if PutDirectIndexLikePutDirect is passed as the mode (the default).
// This method creates a property with attributes writable, enumerable and configurable all set to true if attributes is zero,
// otherwise, it creates a property with the provided attributes. Semantically, this is performing defineOwnProperty.
bool putDirectIndex(JSGlobalObject* globalObject, unsigned propertyName, JSValue value, unsigned attributes, PutDirectIndexMode mode)
{
ASSERT(!value.isCustomGetterSetterSlow());
auto canSetIndexQuicklyForPutDirect = [&] () -> bool {
switch (indexingMode()) {
case ALL_BLANK_INDEXING_TYPES:
case ALL_UNDECIDED_INDEXING_TYPES:
return false;
case ALL_WRITABLE_INT32_INDEXING_TYPES:
case ALL_WRITABLE_DOUBLE_INDEXING_TYPES:
case ALL_WRITABLE_CONTIGUOUS_INDEXING_TYPES:
case ALL_ARRAY_STORAGE_INDEXING_TYPES:
return propertyName < butterfly()->vectorLength();
default:
if (isCopyOnWrite(indexingMode()))
return false;
RELEASE_ASSERT_NOT_REACHED();
return false;
}
};
if (!attributes && canSetIndexQuicklyForPutDirect()) {
setIndexQuickly(getVM(globalObject), propertyName, value);
return true;
}
return putDirectIndexSlowOrBeyondVectorLength(globalObject, propertyName, value, attributes, mode);
}
// This is semantically equivalent to performing defineOwnProperty(propertyName, {configurable:true, writable:true, enumerable:true, value:value}).
bool putDirectIndex(JSGlobalObject* globalObject, unsigned propertyName, JSValue value)
{
return putDirectIndex(globalObject, propertyName, value, 0, PutDirectIndexLikePutDirect);
}
ALWAYS_INLINE bool putDirectIndex(JSGlobalObject* globalObject, uint64_t propertyName, JSValue value, unsigned attributes, PutDirectIndexMode mode)
{
if (propertyName <= MAX_ARRAY_INDEX) [[likely]]
return putDirectIndex(globalObject, static_cast<uint32_t>(propertyName), value, attributes, mode);
return putDirect(getVM(globalObject), Identifier::from(getVM(globalObject), propertyName), value, attributes);
}
// A generally non-throwing version of putDirect and putDirectIndex.
// However, it's only guaranteed to not throw based on what the receiver is.
// For example, if the receiver is a ProxyObject, this is not guaranteed, since
// it may call into arbitrary JS code. It's the responsibility of the user of
// this API to ensure that the receiver object is a well known type if they
// want to ensure that this won't throw an exception.
JS_EXPORT_PRIVATE bool putDirectMayBeIndex(JSGlobalObject*, PropertyName, JSValue);
bool hasIndexingHeader() const
{
return structure()->hasIndexingHeader(this);
}
bool canGetIndexQuicklyForTypedArray(unsigned) const;
JSValue getIndexQuicklyForTypedArray(unsigned, ArrayProfile* = nullptr) const;
bool canGetIndexQuickly(unsigned i) const
{
const Butterfly* butterfly = this->butterfly();
switch (indexingType()) {
case ALL_BLANK_INDEXING_TYPES:
return canGetIndexQuicklyForTypedArray(i);
case ALL_UNDECIDED_INDEXING_TYPES:
return false;
case ALL_INT32_INDEXING_TYPES:
case ALL_CONTIGUOUS_INDEXING_TYPES:
return i < butterfly->vectorLength() && butterfly->contiguous().at(this, i);
case ALL_DOUBLE_INDEXING_TYPES: {
if (i >= butterfly->vectorLength())
return false;
double value = butterfly->contiguousDouble().at(this, i);
if (value != value)
return false;
return true;
}
case ALL_ARRAY_STORAGE_INDEXING_TYPES:
return i < butterfly->arrayStorage()->vectorLength() && butterfly->arrayStorage()->m_vector[i];
default:
RELEASE_ASSERT_NOT_REACHED();
return false;
}
}
bool canGetIndexQuickly(uint64_t i) const
{
ASSERT(i <= maxSafeInteger());
if (i <= MAX_ARRAY_INDEX) [[likely]]
return canGetIndexQuickly(static_cast<uint32_t>(i));
return false;
}
JSValue getIndexQuickly(unsigned i) const
{
const Butterfly* butterfly = this->butterfly();
switch (indexingType()) {
case ALL_INT32_INDEXING_TYPES:
return jsNumber(butterfly->contiguous().at(this, i).get().asInt32());
case ALL_CONTIGUOUS_INDEXING_TYPES:
return butterfly->contiguous().at(this, i).get();
case ALL_DOUBLE_INDEXING_TYPES:
return JSValue(JSValue::EncodeAsDouble, butterfly->contiguousDouble().at(this, i));
case ALL_ARRAY_STORAGE_INDEXING_TYPES:
return butterfly->arrayStorage()->m_vector[i].get();
case ALL_BLANK_INDEXING_TYPES:
return getIndexQuicklyForTypedArray(i);
default:
RELEASE_ASSERT_NOT_REACHED();
return JSValue();
}
}
// Uses the (optional) array profile to set the m_mayBeLargeTypedArray bit when relevant
JSValue tryGetIndexQuickly(unsigned i, ArrayProfile* arrayProfile = nullptr) const
{
const Butterfly* butterfly = this->butterfly();
switch (indexingType()) {
case ALL_BLANK_INDEXING_TYPES:
if (canGetIndexQuicklyForTypedArray(i))
return getIndexQuicklyForTypedArray(i, arrayProfile);
break;
case ALL_UNDECIDED_INDEXING_TYPES:
break;
case ALL_INT32_INDEXING_TYPES:
if (i < butterfly->publicLength()) {
JSValue result = butterfly->contiguous().at(this, i).get();
ASSERT(result.isInt32() || !result);
return result;
}
break;
case ALL_CONTIGUOUS_INDEXING_TYPES:
if (i < butterfly->publicLength())
return butterfly->contiguous().at(this, i).get();
break;
case ALL_DOUBLE_INDEXING_TYPES: {
if (i >= butterfly->publicLength())
break;
double result = butterfly->contiguousDouble().at(this, i);
if (result != result)
break;
return JSValue(JSValue::EncodeAsDouble, result);
}
case ALL_ARRAY_STORAGE_INDEXING_TYPES:
if (i < butterfly->arrayStorage()->vectorLength())
return butterfly->arrayStorage()->m_vector[i].get();
break;
default:
RELEASE_ASSERT_NOT_REACHED();
break;
}
return JSValue();
}
JSValue tryGetIndexQuickly(uint64_t i) const
{
ASSERT(i <= maxSafeInteger());
if (i <= MAX_ARRAY_INDEX) [[likely]]
return tryGetIndexQuickly(static_cast<uint32_t>(i));
return JSValue();
}
JSValue getDirectIndex(JSGlobalObject* globalObject, unsigned i)
{
if (JSValue result = tryGetIndexQuickly(i))
return result;
PropertySlot slot(this, PropertySlot::InternalMethodType::Get);
if (methodTable()->getOwnPropertySlotByIndex(this, globalObject, i, slot))
return slot.getValue(globalObject, i);
return JSValue();
}
JSValue getIndex(JSGlobalObject* globalObject, uint64_t i) const
{
if (JSValue result = tryGetIndexQuickly(i))
return result;
return get(globalObject, i);
}
void setIndexQuicklyForTypedArray(unsigned, JSValue);
void setIndexQuicklyForArrayStorageIndexingType(VM&, unsigned, JSValue);
// Return true to indicate success
// Use the (optional) array profile to set the m_mayBeLargeTypedArray bit when relevant
bool trySetIndexQuicklyForTypedArray(unsigned, JSValue, ArrayProfile*);
bool trySetIndexQuickly(VM& vm, unsigned i, JSValue v, ArrayProfile* arrayProfile = nullptr)
{
Butterfly* butterfly = this->butterfly();
switch (indexingMode()) {
case ALL_BLANK_INDEXING_TYPES:
return trySetIndexQuicklyForTypedArray(i, v, arrayProfile);
case ALL_UNDECIDED_INDEXING_TYPES:
return false;
case ALL_WRITABLE_INT32_INDEXING_TYPES: {
if (i >= butterfly->vectorLength())
return false;
if (!v.isInt32()) {
convertInt32ToDoubleOrContiguousWhilePerformingSetIndex(vm, i, v);
return true;
}
[[fallthrough]];
}
case ALL_WRITABLE_CONTIGUOUS_INDEXING_TYPES: {
if (i >= butterfly->vectorLength())
return false;
butterfly->contiguous().at(this, i).setWithoutWriteBarrier(v);
if (i >= butterfly->publicLength())
butterfly->setPublicLength(i + 1);
vm.writeBarrier(this, v);
return true;
}
case ALL_WRITABLE_DOUBLE_INDEXING_TYPES: {
if (i >= butterfly->vectorLength())
return false;
if (!v.isNumber()) {
convertDoubleToContiguousWhilePerformingSetIndex(vm, i, v);
return true;
}
double value = v.asNumber();
if (value != value) {
convertDoubleToContiguousWhilePerformingSetIndex(vm, i, v);
return true;
}
butterfly->contiguousDouble().at(this, i) = value;
if (i >= butterfly->publicLength())
butterfly->setPublicLength(i + 1);
return true;
}
case NonArrayWithArrayStorage:
case ArrayWithArrayStorage:
if (i >= butterfly->vectorLength())
return false;
setIndexQuicklyForArrayStorageIndexingType(vm, i, v);
return true;
case NonArrayWithSlowPutArrayStorage:
case ArrayWithSlowPutArrayStorage:
if (i >= butterfly->arrayStorage()->vectorLength() || !butterfly->arrayStorage()->m_vector[i])
return false;
setIndexQuicklyForArrayStorageIndexingType(vm, i, v);
return true;
default:
RELEASE_ASSERT(isCopyOnWrite(indexingMode()));
return false;
}
}
void setIndexQuickly(VM& vm, unsigned i, JSValue v)
{
Butterfly* butterfly = this->butterfly();
ASSERT(!isCopyOnWrite(indexingMode()));
switch (indexingType()) {
case ALL_INT32_INDEXING_TYPES: {
ASSERT(i < butterfly->vectorLength());
if (!v.isInt32()) {
convertInt32ToDoubleOrContiguousWhilePerformingSetIndex(vm, i, v);
return;
}
[[fallthrough]];
}
case ALL_CONTIGUOUS_INDEXING_TYPES: {
ASSERT(i < butterfly->vectorLength());
butterfly->contiguous().at(this, i).setWithoutWriteBarrier(v);
if (i >= butterfly->publicLength())
butterfly->setPublicLength(i + 1);
vm.writeBarrier(this, v);
break;
}
case ALL_DOUBLE_INDEXING_TYPES: {
ASSERT(i < butterfly->vectorLength());
if (!v.isNumber()) {
convertDoubleToContiguousWhilePerformingSetIndex(vm, i, v);
return;
}
double value = v.asNumber();
if (value != value) {
convertDoubleToContiguousWhilePerformingSetIndex(vm, i, v);
return;
}
butterfly->contiguousDouble().at(this, i) = value;
if (i >= butterfly->publicLength())
butterfly->setPublicLength(i + 1);
break;
}
case ALL_ARRAY_STORAGE_INDEXING_TYPES:
setIndexQuicklyForArrayStorageIndexingType(vm, i, v);
break;
case ALL_BLANK_INDEXING_TYPES:
setIndexQuicklyForTypedArray(i, v);
break;
default:
RELEASE_ASSERT_NOT_REACHED();
}
}
inline void initializeIndex(ObjectInitializationScope&, unsigned, JSValue); // Defined in JSObjectInlines.h
// NOTE: Clients of this method may call it more than once for any index, and this is supposed
// to work.
ALWAYS_INLINE void initializeIndex(ObjectInitializationScope&, unsigned, JSValue, IndexingType); // Defined in JSObjectInlines.h
inline void initializeIndexWithoutBarrier(ObjectInitializationScope&, unsigned, JSValue); // Defined in JSObjectInlines.h
// This version of initializeIndex is for cases where you know that you will not need any
// barriers. This implies not having any data format conversions.
ALWAYS_INLINE void initializeIndexWithoutBarrier(ObjectInitializationScope&, unsigned, JSValue, IndexingType); // Defined in JSObjectInlines.h
bool hasSparseMap()
{
switch (indexingType()) {
case ALL_BLANK_INDEXING_TYPES:
case ALL_UNDECIDED_INDEXING_TYPES:
case ALL_INT32_INDEXING_TYPES:
case ALL_DOUBLE_INDEXING_TYPES:
case ALL_CONTIGUOUS_INDEXING_TYPES:
return false;
case ALL_ARRAY_STORAGE_INDEXING_TYPES:
return !!butterfly()->arrayStorage()->m_sparseMap;
default:
RELEASE_ASSERT_NOT_REACHED();
return false;
}
}
bool inSparseIndexingMode()
{
switch (indexingType()) {
case ALL_BLANK_INDEXING_TYPES:
case ALL_UNDECIDED_INDEXING_TYPES:
case ALL_INT32_INDEXING_TYPES:
case ALL_DOUBLE_INDEXING_TYPES:
case ALL_CONTIGUOUS_INDEXING_TYPES:
return false;
case ALL_ARRAY_STORAGE_INDEXING_TYPES:
return butterfly()->arrayStorage()->inSparseMode();
default:
RELEASE_ASSERT_NOT_REACHED();
return false;
}
}
void enterDictionaryIndexingMode(VM&);
// putDirect is effectively an unchecked vesion of 'defineOwnProperty':
// - the prototype chain is not consulted
// - accessors are not called.
// - attributes will be respected (after the call the property will exist with the given attributes)
// - the property name is assumed to not be an index.
bool putDirect(VM&, PropertyName, JSValue, unsigned attributes = 0);
bool putDirect(VM&, PropertyName, JSValue, unsigned attributes, PutPropertySlot&);
bool putDirect(VM&, PropertyName, JSValue, PutPropertySlot&);
void putDirectWithoutTransition(VM&, PropertyName, JSValue, unsigned attributes = 0);
bool putDirectNonIndexAccessor(VM&, PropertyName, GetterSetter*, unsigned attributes);
void putDirectNonIndexAccessorWithoutTransition(VM&, PropertyName, GetterSetter*, unsigned attributes);
bool putDirectAccessor(JSGlobalObject*, PropertyName, GetterSetter*, unsigned attributes);
JS_EXPORT_PRIVATE bool putDirectCustomAccessor(VM&, PropertyName, JSValue, unsigned attributes);
void putDirectCustomGetterSetterWithoutTransition(VM&, PropertyName, JSValue, unsigned attributes);
bool putGetter(JSGlobalObject*, PropertyName, JSValue, unsigned attributes);
bool putSetter(JSGlobalObject*, PropertyName, JSValue, unsigned attributes);
JS_EXPORT_PRIVATE bool hasProperty(JSGlobalObject*, PropertyName) const;
JS_EXPORT_PRIVATE bool hasProperty(JSGlobalObject*, unsigned propertyName) const;
bool hasProperty(JSGlobalObject*, uint64_t propertyName) const;
bool hasEnumerableProperty(JSGlobalObject*, PropertyName) const;
bool hasEnumerableProperty(JSGlobalObject*, unsigned propertyName) const;
bool hasOwnProperty(JSGlobalObject*, PropertyName, PropertySlot&) const;
bool hasOwnProperty(JSGlobalObject*, PropertyName) const;
bool hasOwnProperty(JSGlobalObject*, unsigned) const;
JS_EXPORT_PRIVATE static bool deleteProperty(JSCell*, JSGlobalObject*, PropertyName, DeletePropertySlot&);
JS_EXPORT_PRIVATE static bool deletePropertyByIndex(JSCell*, JSGlobalObject*, unsigned propertyName);
bool deleteProperty(JSGlobalObject*, PropertyName);
bool deleteProperty(JSGlobalObject*, uint32_t propertyName);
bool deleteProperty(JSGlobalObject*, uint64_t propertyName);
JSValue ordinaryToPrimitive(JSGlobalObject*, PreferredPrimitiveType) const;
JS_EXPORT_PRIVATE bool hasInstance(JSGlobalObject*, JSValue value, JSValue hasInstanceValue);
JS_EXPORT_PRIVATE bool hasInstance(JSGlobalObject*, JSValue);
static bool defaultHasInstance(JSGlobalObject*, JSValue, JSValue prototypeProperty);
static constexpr unsigned maximumPrototypeChainDepth = 40000;
JS_EXPORT_PRIVATE void getPropertyNames(JSGlobalObject*, PropertyNameArrayBuilder&, DontEnumPropertiesMode);
JS_EXPORT_PRIVATE static void getOwnPropertyNames(JSObject*, JSGlobalObject*, PropertyNameArrayBuilder&, DontEnumPropertiesMode);
JS_EXPORT_PRIVATE static void NODELETE getOwnSpecialPropertyNames(JSObject*, JSGlobalObject*, PropertyNameArrayBuilder&, DontEnumPropertiesMode);
JS_EXPORT_PRIVATE void getOwnIndexedPropertyNames(JSGlobalObject*, PropertyNameArrayBuilder&, DontEnumPropertiesMode);
JS_EXPORT_PRIVATE void getOwnNonIndexPropertyNames(JSGlobalObject*, PropertyNameArrayBuilder&, DontEnumPropertiesMode);
void getNonReifiedStaticPropertyNames(VM&, PropertyNameArrayBuilder&, DontEnumPropertiesMode);
JS_EXPORT_PRIVATE uint32_t getEnumerableLength();
JS_EXPORT_PRIVATE JSValue toPrimitive(JSGlobalObject*, PreferredPrimitiveType = NoPreference) const;
JS_EXPORT_PRIVATE double toNumber(JSGlobalObject*) const;
JS_EXPORT_PRIVATE JSString* toString(JSGlobalObject*) const;
// This get function only looks at the property map.
JSValue getDirect(VM& vm, PropertyName propertyName) const
{
Structure* structure = this->structure();
PropertyOffset offset = structure->get(vm, propertyName);
checkOffset(offset, structure->inlineCapacity());
return offset != invalidOffset ? getDirect(offset) : JSValue();
}
JSValue getDirect(VM& vm, PropertyName propertyName, unsigned& attributes) const
{
Structure* structure = this->structure();
PropertyOffset offset = structure->get(vm, propertyName, attributes);
checkOffset(offset, structure->inlineCapacity());
return offset != invalidOffset ? getDirect(offset) : JSValue();
}
PropertyOffset getDirectOffset(VM& vm, PropertyName propertyName)
{
Structure* structure = this->structure();
PropertyOffset offset = structure->get(vm, propertyName);
checkOffset(offset, structure->inlineCapacity());
return offset;
}
PropertyOffset getDirectOffset(VM& vm, PropertyName propertyName, unsigned& attributes)
{
Structure* structure = this->structure();
PropertyOffset offset = structure->get(vm, propertyName, attributes);
checkOffset(offset, structure->inlineCapacity());
return offset;
}
bool hasInlineStorage() const { return structure()->hasInlineStorage(); }
ConstPropertyStorage inlineStorageUnsafe() const
{
return std::bit_cast<ConstPropertyStorage>(std::bit_cast<const char*>(this) + offsetOfInlineStorage());
}
PropertyStorage inlineStorageUnsafe()
{
return std::bit_cast<PropertyStorage>(std::bit_cast<char*>(this) + offsetOfInlineStorage());
}
ConstPropertyStorage inlineStorage() const
{
ASSERT(hasInlineStorage());
return inlineStorageUnsafe();
}
PropertyStorage inlineStorage()
{
ASSERT(hasInlineStorage());
return inlineStorageUnsafe();
}
const Butterfly* butterfly() const LIFETIME_BOUND
{
return const_cast<JSObject*>(this)->butterfly();
}
Butterfly* butterfly() LIFETIME_BOUND
{
// Access m_butterfly field of JSObjectWithButterfly regardless of whether this object is a derived class of JSObjectWithButterfly.
// This is safe as atom of GC heap allocation is 16 bytes, thus the butterfly field, offset from 8 byte, is always accessible.
// We intentionally load it regardless to make this function branchless. This is critical to keep this fast while we have butterfly-less objects.
auto* b = *std::bit_cast<Butterfly**>(std::bit_cast<char*>(this) + butterflyOffset());
if (type() == WebAssemblyGCObjectType) [[unlikely]]
b = nullptr;
return b;
}
ConstPropertyStorage outOfLineStorage() const { return butterfly()->propertyStorage(); }
PropertyStorage outOfLineStorage() { return butterfly()->propertyStorage(); }
ALWAYS_INLINE const WriteBarrierBase<Unknown>* locationForOffset(PropertyOffset offset) const
{
if (isInlineOffset(offset))
return &inlineStorage()[offsetInInlineStorage(offset)];
return &outOfLineStorage()[offsetInOutOfLineStorage(offset)];
}
ALWAYS_INLINE WriteBarrierBase<Unknown>* locationForOffset(PropertyOffset offset)
{
if (isInlineOffset(offset))
return &inlineStorage()[offsetInInlineStorage(offset)];
return &outOfLineStorage()[offsetInOutOfLineStorage(offset)];
}
void transitionTo(VM&, Structure*);
bool hasCustomProperties() { return structure()->didTransition(); }
bool hasNonReifiedStaticProperties()
{
return TypeInfo::hasStaticPropertyTable(inlineTypeFlags()) && !structure()->staticPropertiesReified();
}
// putOwnDataProperty has 'put' like semantics, however this method:
// - assumes the object contains no own getter/setter properties.
// - provides no special handling for __proto__
// - does not walk the prototype chain (to check for accessors or non-writable properties).
// This is used by JSLexicalEnvironment.
bool putOwnDataProperty(VM&, PropertyName, JSValue, PutPropertySlot&);
bool putOwnDataPropertyMayBeIndex(JSGlobalObject*, PropertyName, JSValue, PutPropertySlot&);
void putOwnDataPropertyBatching(VM&, UniquedStringImpl**, const EncodedJSValue*, unsigned size);
private:
void validatePutOwnDataProperty(VM&, PropertyName, JSValue);
public:
// Fast access to known property offsets.
ALWAYS_INLINE JSValue getDirect(PropertyOffset offset) const { return locationForOffset(offset)->get(); }
JSValue getDirect(Locker<JSCellLock>&, Concurrency, Structure* expectedStructure, PropertyOffset) const;
JSValue getDirectConcurrently(Locker<JSCellLock>&, Structure* expectedStructure, PropertyOffset) const;
void putDirectOffset(VM& vm, PropertyOffset offset, JSValue value) { locationForOffset(offset)->set(vm, this, value); }
void putDirectWithoutBarrier(PropertyOffset offset, JSValue value) { locationForOffset(offset)->setWithoutWriteBarrier(value); }
JS_EXPORT_PRIVATE bool putDirectNativeIntrinsicGetter(VM&, JSGlobalObject*, Identifier, NativeFunction, Intrinsic, unsigned attributes);
JS_EXPORT_PRIVATE void putDirectNativeIntrinsicGetterWithoutTransition(VM&, JSGlobalObject*, Identifier, NativeFunction, Intrinsic, unsigned attributes);
JS_EXPORT_PRIVATE bool putDirectNativeFunction(VM&, JSGlobalObject*, const PropertyName&, unsigned functionLength, NativeFunction, ImplementationVisibility, Intrinsic, unsigned attributes);
JS_EXPORT_PRIVATE bool putDirectNativeFunction(VM&, JSGlobalObject*, const PropertyName&, unsigned functionLength, NativeFunction, ImplementationVisibility, Intrinsic, const DOMJIT::Signature*, unsigned attributes);
JS_EXPORT_PRIVATE void putDirectNativeFunctionWithoutTransition(VM&, JSGlobalObject*, const PropertyName&, unsigned functionLength, NativeFunction, ImplementationVisibility, Intrinsic, unsigned attributes);
JS_EXPORT_PRIVATE JSFunction* putDirectBuiltinFunction(VM&, JSGlobalObject*, const PropertyName&, FunctionExecutable*, unsigned attributes);
JSFunction* putDirectBuiltinFunctionWithoutTransition(VM&, JSGlobalObject*, const PropertyName&, FunctionExecutable*, unsigned attributes);
JS_EXPORT_PRIVATE static bool defineOwnProperty(JSObject*, JSGlobalObject*, PropertyName, const PropertyDescriptor&, bool shouldThrow);
bool createDataProperty(JSGlobalObject*, PropertyName, JSValue, bool shouldThrow);
bool isEnvironment() const;
bool isGlobalObject() const;
bool isJSLexicalEnvironment() const;
bool isGlobalLexicalEnvironment() const;
bool isStrictEvalActivation() const;
bool isWithScope() const;
bool isErrorInstance() const;
JS_EXPORT_PRIVATE void seal(VM&);
JS_EXPORT_PRIVATE void freeze(VM&);
JS_EXPORT_PRIVATE static bool preventExtensions(JSObject*, JSGlobalObject*);
JS_EXPORT_PRIVATE static bool NODELETE isExtensible(JSObject*, JSGlobalObject*);
bool isSealed(VM& vm) { return structure()->isSealed(vm); }
bool isFrozen(VM& vm) { return structure()->isFrozen(vm); }
JS_EXPORT_PRIVATE bool NODELETE anyObjectInChainMayInterceptIndexedAccesses() const;
bool NODELETE needsSlowPutIndexing() const;
private:
TransitionKind NODELETE suggestedArrayStorageTransition() const;
public:
// You should only call isStructureExtensible() when:
// - Performing this check in a way that isn't described in the specification
// as calling the virtual [[IsExtensible]] trap.
// - When you're guaranteed that object->methodTable()->isExtensible isn't
// overridden.
ALWAYS_INLINE bool isStructureExtensible() { return structure()->isStructureExtensible(); }
// You should call this when performing [[IsExtensible]] trap in a place
// that is described in the specification. This performs the fully virtual
// [[IsExtensible]] trap.
bool isExtensible(JSGlobalObject*);
bool indexingShouldBeSparse()
{
return !isStructureExtensible()
|| structure()->typeInfo().interceptsGetOwnPropertySlotByIndexEvenWhenLengthIsNotZero();
}
bool staticPropertiesReified() { return structure()->staticPropertiesReified(); }
void reifyAllStaticProperties(JSGlobalObject*);
JS_EXPORT_PRIVATE Butterfly* allocateMoreOutOfLineStorage(VM&, size_t oldSize, size_t newSize);
// Call this when you do not need to change the structure.
inline void setButterfly(VM&, Butterfly*); // Defined in JSObjectInlines.h
// Call this if you do need to change the structure, or if you changed something about a structure
// in-place.
inline void nukeStructureAndSetButterfly(VM&, StructureID oldStructureID, Butterfly*); // Defined in JSObjectInlines.h
void setStructure(VM&, Structure*);
JS_EXPORT_PRIVATE void convertToDictionary(VM&);
JS_EXPORT_PRIVATE void convertToUncacheableDictionary(VM&);
void flattenDictionaryObject(VM& vm)
{
structure()->flattenDictionaryStructure(vm, this);
}
void shiftButterflyAfterFlattening(const GCSafeConcurrentJSLocker&, VM&, Structure* structure, size_t outOfLineCapacityAfter);
JSGlobalObject* realmMayBeNull() const
{
return structure()->realm();
}
JSGlobalObject* realm() const
{
SUPPRESS_FORWARD_DECL_ARG auto* result = realmMayBeNull();
RELEASE_ASSERT(result, "Do not call JSObject::realm() on objects with realmless structures (e.g., WebAssembly GC objects)");
ASSERT(!isGlobalObject() || ((JSObject*)result) == this);
return result;
}
void switchToSlowPutArrayStorage(VM&);
// The receiver is the prototype in this case. The following:
//
// asObject(foo->structure()->storedPrototype())->attemptToInterceptPutByIndexOnHoleForPrototype(...)
//
// is equivalent to:
//
// foo->attemptToInterceptPutByIndexOnHole(...);
bool attemptToInterceptPutByIndexOnHoleForPrototype(JSGlobalObject*, JSValue thisValue, unsigned propertyName, JSValue, bool shouldThrow, bool& putResult);
// Returns 0 if int32 storage cannot be created - either because
// indexing should be sparse, we're having a bad time, or because
// we already have a more general form of storage (double,
// contiguous, array storage).
ContiguousJSValues tryMakeWritableInt32(VM& vm)
{
if (hasInt32(indexingType()) && !isCopyOnWrite(indexingMode())) [[likely]]
return butterfly()->contiguousInt32();
return tryMakeWritableInt32Slow(vm);
}
// Returns 0 if double storage cannot be created - either because
// indexing should be sparse, we're having a bad time, or because
// we already have a more general form of storage (contiguous,
// or array storage).
ContiguousDoubles tryMakeWritableDouble(VM& vm)
{
if (hasDouble(indexingType()) && !isCopyOnWrite(indexingMode())) [[likely]]
return butterfly()->contiguousDouble();
return tryMakeWritableDoubleSlow(vm);
}
// Returns 0 if contiguous storage cannot be created - either because
// indexing should be sparse or because we're having a bad time.
ContiguousJSValues tryMakeWritableContiguous(VM& vm)
{
if (hasContiguous(indexingType()) && !isCopyOnWrite(indexingMode())) [[likely]]
return butterfly()->contiguous();
return tryMakeWritableContiguousSlow(vm);
}
// Ensure that the object is in a mode where it has array storage. Use
// this if you're about to perform actions that would have required the
// object to be converted to have array storage, if it didn't have it
// already.
ArrayStorage* ensureArrayStorage(VM& vm)
{
if (hasAnyArrayStorage(indexingType())) [[likely]]
return butterfly()->arrayStorage();
return ensureArrayStorageSlow(vm);
}
void ensureWritable(VM& vm)
{
if (isCopyOnWrite(indexingMode()))
convertFromCopyOnWrite(vm);
}
static constexpr size_t offsetOfInlineStorage();
static constexpr ptrdiff_t butterflyOffset()
{
return sizeof(JSObject);
}
void* butterflyAddress()
{
return std::bit_cast<char*>(this) + butterflyOffset();
}
JS_EXPORT_PRIVATE JSValue getMethod(JSGlobalObject*, CallData&, const Identifier&, const String& errorMessage);
bool canPerformFastPutInline(VM&, PropertyName);
bool canPerformFastPutInlineExcludingProto();
bool mayBePrototype() const;
void didBecomePrototype(VM&);
std::optional<Structure::PropertyHashEntry> findPropertyHashEntry(PropertyName) const;
DECLARE_EXPORT_INFO;
bool getOwnNonIndexPropertySlot(VM&, Structure*, PropertyName, PropertySlot&);
bool getNonIndexPropertySlot(JSGlobalObject*, PropertyName, PropertySlot&);
JS_EXPORT_PRIVATE NEVER_INLINE bool putInlineSlow(JSGlobalObject*, PropertyName, JSValue, PutPropertySlot&);
JS_EXPORT_PRIVATE NEVER_INLINE bool putInlineFastReplacingStaticPropertyIfNeeded(JSGlobalObject*, PropertyName, JSValue, PutPropertySlot&);
bool putInlineFast(JSGlobalObject*, PropertyName, JSValue, PutPropertySlot&);
protected:
#if ASSERT_ENABLED
void finishCreation(VM& vm)
{
Base::finishCreation(vm);
ASSERT(is<JSObject>(this));
ASSERT(structure()->hasPolyProto() || getPrototypeDirect().isNull() || Heap::heap(this) == Heap::heap(getPrototypeDirect()));
ASSERT(structure()->isObject());
ASSERT(classInfo());
}
#endif
inline static Structure* createStructure(VM&, JSGlobalObject*, JSValue);
// To instantiate objects you likely want JSFinalObject, below.
// To create derived types you likely want JSNonFinalObject, below.
JSObject(VM&, Structure*);
// Returns reference to butterfly field storage. Only valid for objects that have butterfly storage
// (JSObjectWithButterfly subclasses). Used by JSObject methods that manipulate butterfly storage.
ALWAYS_INLINE AuxiliaryBarrier<Butterfly*>& butterflyRef()
{
ASSERT(type() != WebAssemblyGCObjectType);
return *std::bit_cast<AuxiliaryBarrier<Butterfly*>*>(std::bit_cast<char*>(this) + butterflyOffset());
}
JSObject(CreatingWellDefinedBuiltinCellTag, StructureID structureID, int32_t blob)
: JSCell(CreatingWellDefinedBuiltinCell, structureID, blob)
{
}
// Call this if you know that the object is in a mode where it has array
// storage. This will assert otherwise.
ArrayStorage* arrayStorage()
{
ASSERT(hasAnyArrayStorage(indexingType()));
return butterfly()->arrayStorage();
}
// Call this if you want to predicate some actions on whether or not the
// object is in a mode where it has array storage.
ArrayStorage* arrayStorageOrNull()
{
switch (indexingType()) {
case ALL_ARRAY_STORAGE_INDEXING_TYPES:
return butterfly()->arrayStorage();
default:
return nullptr;
}
}
size_t butterflyTotalSize();
size_t butterflyPreCapacity();
Butterfly* createInitialUndecided(VM&, unsigned length);
ContiguousJSValues createInitialInt32(VM&, unsigned length);
ContiguousDoubles createInitialDouble(VM&, unsigned length);
ContiguousJSValues createInitialContiguous(VM&, unsigned length);
void convertUndecidedForValue(VM&, JSValue);
void createInitialForValueAndSet(VM&, unsigned index, JSValue);
void convertInt32ForValue(VM&, JSValue);
void convertDoubleForValue(VM&, JSValue);
void convertFromCopyOnWrite(VM&);
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