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| -rw-r--r-- | dom/bindings/DOMJSClass.h | 634 |
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diff --git a/dom/bindings/DOMJSClass.h b/dom/bindings/DOMJSClass.h new file mode 100644 index 0000000000..12055fe6ba --- /dev/null +++ b/dom/bindings/DOMJSClass.h @@ -0,0 +1,634 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this file, + * You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#ifndef mozilla_dom_DOMJSClass_h +#define mozilla_dom_DOMJSClass_h + +#include "jsapi.h" +#include "jsfriendapi.h" +#include "js/Object.h" // JS::GetClass, JS::GetReservedSlot +#include "js/Wrapper.h" +#include "mozilla/Assertions.h" +#include "mozilla/Attributes.h" +#include "mozilla/OriginTrials.h" +#include "mozilla/Likely.h" + +#include "mozilla/dom/PrototypeList.h" // auto-generated +#include "mozilla/dom/WebIDLPrefs.h" // auto-generated + +class nsCycleCollectionParticipant; +class nsWrapperCache; +struct JSFunctionSpec; +struct JSPropertySpec; +struct JSStructuredCloneReader; +struct JSStructuredCloneWriter; +class nsIGlobalObject; + +// All DOM globals must have a slot at DOM_PROTOTYPE_SLOT. +#define DOM_PROTOTYPE_SLOT JSCLASS_GLOBAL_SLOT_COUNT + +// Keep this count up to date with any extra global slots added above. +#define DOM_GLOBAL_SLOTS 1 + +// We use these flag bits for the new bindings. +#define JSCLASS_DOM_GLOBAL JSCLASS_USERBIT1 +#define JSCLASS_IS_DOMIFACEANDPROTOJSCLASS JSCLASS_USERBIT2 + +namespace mozilla::dom { + +/** + * Returns true if code running in the given JSContext is allowed to access + * [SecureContext] API on the given JSObject. + * + * [SecureContext] API exposure is restricted to use by code in a Secure + * Contexts: + * + * https://w3c.github.io/webappsec-secure-contexts/ + * + * Since we want [SecureContext] exposure to depend on the privileges of the + * running code (rather than the privileges of an object's creator), this + * function checks to see whether the given JSContext's Realm is flagged + * as a Secure Context. That allows us to make sure that system principal code + * (which is marked as a Secure Context) can access Secure Context API on an + * object in a different realm, regardless of whether the other realm is a + * Secure Context or not. + * + * Checking the JSContext's Realm doesn't work for expanded principal + * globals accessing a Secure Context web page though (e.g. those used by frame + * scripts). To handle that we fall back to checking whether the JSObject came + * from a Secure Context. + * + * Note: We'd prefer this function to live in BindingUtils.h, but we need to + * call it in this header, and BindingUtils.h includes us (i.e. we'd have a + * circular dependency between headers if it lived there). + */ +inline bool IsSecureContextOrObjectIsFromSecureContext(JSContext* aCx, + JSObject* aObj) { + MOZ_ASSERT(!js::IsWrapper(aObj)); + return JS::GetIsSecureContext(js::GetContextRealm(aCx)) || + JS::GetIsSecureContext(js::GetNonCCWObjectRealm(aObj)); +} + +typedef bool (*ResolveOwnProperty)( + JSContext* cx, JS::Handle<JSObject*> wrapper, JS::Handle<JSObject*> obj, + JS::Handle<jsid> id, + JS::MutableHandle<mozilla::Maybe<JS::PropertyDescriptor>> desc); + +typedef bool (*EnumerateOwnProperties)(JSContext* cx, + JS::Handle<JSObject*> wrapper, + JS::Handle<JSObject*> obj, + JS::MutableHandleVector<jsid> props); + +typedef bool (*DeleteNamedProperty)(JSContext* cx, + JS::Handle<JSObject*> wrapper, + JS::Handle<JSObject*> obj, + JS::Handle<jsid> id, + JS::ObjectOpResult& opresult); + +// Returns true if the given global is of a type whose bit is set in +// aGlobalSet. +bool IsGlobalInExposureSet(JSContext* aCx, JSObject* aGlobal, + uint32_t aGlobalSet); + +struct ConstantSpec { + const char* name; + JS::Value value; +}; + +typedef bool (*PropertyEnabled)(JSContext* cx, JSObject* global); + +namespace GlobalNames { +// The names of our possible globals. These are the names of the actual +// interfaces, not of the global names used to refer to them in IDL [Exposed] +// annotations. +static const uint32_t Window = 1u << 0; +static const uint32_t DedicatedWorkerGlobalScope = 1u << 1; +static const uint32_t SharedWorkerGlobalScope = 1u << 2; +static const uint32_t ServiceWorkerGlobalScope = 1u << 3; +static const uint32_t WorkerDebuggerGlobalScope = 1u << 4; +static const uint32_t AudioWorkletGlobalScope = 1u << 5; +static const uint32_t PaintWorkletGlobalScope = 1u << 6; +static const uint32_t ShadowRealmGlobalScope = 1u << 7; + +static constexpr uint32_t kCount = 8; +} // namespace GlobalNames + +struct PrefableDisablers { + inline bool isEnabled(JSContext* cx, JS::Handle<JSObject*> obj) const { + if (nonExposedGlobals && + IsGlobalInExposureSet(cx, JS::GetNonCCWObjectGlobal(obj), + nonExposedGlobals)) { + return false; + } + if (prefIndex != WebIDLPrefIndex::NoPref && + !sWebIDLPrefs[uint16_t(prefIndex)]()) { + return false; + } + if (secureContext && !IsSecureContextOrObjectIsFromSecureContext(cx, obj)) { + return false; + } + if (trial != OriginTrial(0) && + !OriginTrials::IsEnabled(cx, JS::GetNonCCWObjectGlobal(obj), trial)) { + // TODO(emilio): Perhaps reconsider the interaction between [Trial=""] and + // [Pref=""]. + // + // In particular, it might be desirable to only check the trial if there + // is no pref or the pref is disabled. + return false; + } + if (enabledFunc && !enabledFunc(cx, JS::GetNonCCWObjectGlobal(obj))) { + return false; + } + return true; + } + + // Index into the array of StaticPrefs + const WebIDLPrefIndex prefIndex; + + // Bitmask of global names that we should not be exposed in. + const uint16_t nonExposedGlobals : GlobalNames::kCount; + + // A boolean indicating whether a Secure Context is required. + const uint16_t secureContext : 1; + + // An origin trial controlling the feature. This can be made a bitfield too if + // needed. + const OriginTrial trial; + + // A function pointer to a function that can say the property is disabled + // even if "enabled" is set to true. If the pointer is null the value of + // "enabled" is used as-is. + const PropertyEnabled enabledFunc; +}; + +template <typename T> +struct Prefable { + inline bool isEnabled(JSContext* cx, JS::Handle<JSObject*> obj) const { + MOZ_ASSERT(!js::IsWrapper(obj)); + if (MOZ_LIKELY(!disablers)) { + return true; + } + return disablers->isEnabled(cx, obj); + } + + // Things that can disable this set of specs. |nullptr| means "cannot be + // disabled". + const PrefableDisablers* const disablers; + + // Array of specs, terminated in whatever way is customary for T. + // Null to indicate a end-of-array for Prefable, when such an + // indicator is needed. + const T* const specs; +}; + +enum PropertyType { + eStaticMethod, + eStaticAttribute, + eMethod, + eAttribute, + eUnforgeableMethod, + eUnforgeableAttribute, + eConstant, + ePropertyTypeCount +}; + +#define NUM_BITS_PROPERTY_INFO_TYPE 3 +#define NUM_BITS_PROPERTY_INFO_PREF_INDEX 13 +#define NUM_BITS_PROPERTY_INFO_SPEC_INDEX 16 + +struct PropertyInfo { + private: + // MSVC generates static initializers if we store a jsid here, even if + // PropertyInfo has a constexpr constructor. See bug 1460341 and bug 1464036. + uintptr_t mIdBits; + + public: + // One of PropertyType, will be used for accessing the corresponding Duo in + // NativePropertiesN.duos[]. + uint32_t type : NUM_BITS_PROPERTY_INFO_TYPE; + // The index to the corresponding Preable in Duo.mPrefables[]. + uint32_t prefIndex : NUM_BITS_PROPERTY_INFO_PREF_INDEX; + // The index to the corresponding spec in Duo.mPrefables[prefIndex].specs[]. + uint32_t specIndex : NUM_BITS_PROPERTY_INFO_SPEC_INDEX; + + void SetId(jsid aId) { + static_assert(sizeof(jsid) == sizeof(mIdBits), + "jsid should fit in mIdBits"); + mIdBits = aId.asRawBits(); + } + MOZ_ALWAYS_INLINE jsid Id() const { return jsid::fromRawBits(mIdBits); } + + bool IsStaticMethod() const { return type == eStaticMethod; } + + static int Compare(const PropertyInfo& aInfo1, const PropertyInfo& aInfo2) { + // IdToIndexComparator needs to be updated if the order here is changed! + if (MOZ_UNLIKELY(aInfo1.mIdBits == aInfo2.mIdBits)) { + MOZ_ASSERT((aInfo1.type == eMethod || aInfo1.type == eStaticMethod) && + (aInfo2.type == eMethod || aInfo2.type == eStaticMethod)); + + bool isStatic1 = aInfo1.IsStaticMethod(); + + MOZ_ASSERT(isStatic1 != aInfo2.IsStaticMethod(), + "We shouldn't have 2 static methods with the same name!"); + + return isStatic1 ? -1 : 1; + } + + return aInfo1.mIdBits < aInfo2.mIdBits ? -1 : 1; + } +}; + +static_assert( + ePropertyTypeCount <= 1ull << NUM_BITS_PROPERTY_INFO_TYPE, + "We have property type count that is > (1 << NUM_BITS_PROPERTY_INFO_TYPE)"); + +// Conceptually, NativeProperties has seven (Prefable<T>*, PropertyInfo*) duos +// (where T is one of JSFunctionSpec, JSPropertySpec, or ConstantSpec), one for +// each of: static methods and attributes, methods and attributes, unforgeable +// methods and attributes, and constants. +// +// That's 14 pointers, but in most instances most of the duos are all null, and +// there are many instances. To save space we use a variable-length type, +// NativePropertiesN<N>, to hold the data and getters to access it. It has N +// actual duos (stored in duos[]), plus four bits for each of the 7 possible +// duos: 1 bit that states if that duo is present, and 3 that state that duo's +// offset (if present) in duos[]. +// +// All duo accesses should be done via the getters, which contain assertions +// that check we don't overrun the end of the struct. (The duo data members are +// public only so they can be statically initialized.) These assertions should +// never fail so long as (a) accesses to the variable-length part are guarded by +// appropriate Has*() calls, and (b) all instances are well-formed, i.e. the +// value of N matches the number of mHas* members that are true. +// +// We store all the property ids a NativePropertiesN owns in a single array of +// PropertyInfo structs. Each struct contains an id and the information needed +// to find the corresponding Prefable for the enabled check, as well as the +// information needed to find the correct property descriptor in the +// Prefable. We also store an array of indices into the PropertyInfo array, +// sorted by bits of the corresponding jsid. Given a jsid, this allows us to +// binary search for the index of the corresponding PropertyInfo, if any. +// +// Finally, we define a typedef of NativePropertiesN<7>, NativeProperties, which +// we use as a "base" type used to refer to all instances of NativePropertiesN. +// (7 is used because that's the maximum valid parameter, though any other +// value 1..6 could also be used.) This is reasonable because of the +// aforementioned assertions in the getters. Upcast() is used to convert +// specific instances to this "base" type. +// +// An example +// ---------- +// NativeProperties points to various things, and it can be hard to keep track. +// The following example shows the layout. +// +// Imagine an example interface, with: +// - 10 properties +// - 6 methods, 3 with no disablers struct, 2 sharing the same disablers +// struct, 1 using a different disablers struct +// - 4 attributes, all with no disablers +// - The property order is such that those using the same disablers structs are +// together. (This is not guaranteed, but it makes the example simpler.) +// +// Each PropertyInfo also contain indices into sMethods/sMethods_specs (for +// method infos) and sAttributes/sAttributes_specs (for attributes), which let +// them find their spec, but these are not shown. +// +// sNativeProperties sNativeProperties_ sNativeProperties_ +// ---- sortedPropertyIndices[10] propertyInfos[10] +// - <several scalar fields> ---- ---- +// - sortedPropertyIndices ----> <10 indices> +--> 0 info (method) +// - duos[2] ---- | 1 info (method) +// ----(methods) | 2 info (method) +// 0 - mPrefables -------> points to sMethods below | 3 info (method) +// - mPropertyInfos ------------------------------+ 4 info (method) +// 1 - mPrefables -------> points to sAttributes below 5 info (method) +// - mPropertyInfos ---------------------------------> 6 info (attr) +// ---- 7 info (attr) +// ---- 8 info (attr) +// 9 info (attr) +// ---- +// +// sMethods has three entries (excluding the terminator) because there are +// three disablers structs. The {nullptr,nullptr} serves as the terminator. +// There are also END terminators within sMethod_specs; the need for these +// terminators (as opposed to a length) is deeply embedded in SpiderMonkey. +// Disablers structs are suffixed with the index of the first spec they cover. +// +// sMethods sMethods_specs +// ---- ---- +// 0 - nullptr +----> 0 spec +// - specs ----------------------+ 1 spec +// 1 - disablers ---> disablers4 2 spec +// - specs ------------------------+ 3 END +// 2 - disablers ---> disablers7 +--> 4 spec +// - specs ----------------------+ 5 spec +// 3 - nullptr | 6 END +// - nullptr +----> 7 spec +// ---- 8 END +// +// sAttributes has a single entry (excluding the terminator) because all of the +// specs lack disablers. +// +// sAttributes sAttributes_specs +// ---- ---- +// 0 - nullptr +----> 0 spec +// - specs ----------------------+ 1 spec +// 1 - nullptr 2 spec +// - nullptr 3 spec +// ---- 4 END +// ---- +template <int N> +struct NativePropertiesN { + // Duo structs are stored in the duos[] array, and each element in the array + // could require a different T. Therefore, we can't use the correct type for + // mPrefables. Instead we use void* and cast to the correct type in the + // getters. + struct Duo { + const /*Prefable<const T>*/ void* const mPrefables; + PropertyInfo* const mPropertyInfos; + }; + + constexpr const NativePropertiesN<7>* Upcast() const { + return reinterpret_cast<const NativePropertiesN<7>*>(this); + } + + const PropertyInfo* PropertyInfos() const { return duos[0].mPropertyInfos; } + +#define DO(SpecT, FieldName) \ + public: \ + /* The bitfields indicating the duo's presence and (if present) offset. */ \ + const uint32_t mHas##FieldName##s : 1; \ + const uint32_t m##FieldName##sOffset : 3; \ + \ + private: \ + const Duo* FieldName##sDuo() const { \ + MOZ_ASSERT(Has##FieldName##s()); \ + return &duos[m##FieldName##sOffset]; \ + } \ + \ + public: \ + bool Has##FieldName##s() const { return mHas##FieldName##s; } \ + const Prefable<const SpecT>* FieldName##s() const { \ + return static_cast<const Prefable<const SpecT>*>( \ + FieldName##sDuo()->mPrefables); \ + } \ + PropertyInfo* FieldName##PropertyInfos() const { \ + return FieldName##sDuo()->mPropertyInfos; \ + } + + DO(JSFunctionSpec, StaticMethod) + DO(JSPropertySpec, StaticAttribute) + DO(JSFunctionSpec, Method) + DO(JSPropertySpec, Attribute) + DO(JSFunctionSpec, UnforgeableMethod) + DO(JSPropertySpec, UnforgeableAttribute) + DO(ConstantSpec, Constant) + +#undef DO + + // The index to the iterator method in MethodPropertyInfos() array. + const int16_t iteratorAliasMethodIndex; + // The number of PropertyInfo structs that the duos manage. This is the total + // count across all duos. + const uint16_t propertyInfoCount; + // The sorted indices array from sorting property ids, which will be used when + // we binary search for a property. + uint16_t* sortedPropertyIndices; + + const Duo duos[N]; +}; + +// Ensure the struct has the expected size. The 8 is for the bitfields plus +// iteratorAliasMethodIndex and idsLength; the rest is for the idsSortedIndex, +// and duos[]. +static_assert(sizeof(NativePropertiesN<1>) == 8 + 3 * sizeof(void*), "1 size"); +static_assert(sizeof(NativePropertiesN<2>) == 8 + 5 * sizeof(void*), "2 size"); +static_assert(sizeof(NativePropertiesN<3>) == 8 + 7 * sizeof(void*), "3 size"); +static_assert(sizeof(NativePropertiesN<4>) == 8 + 9 * sizeof(void*), "4 size"); +static_assert(sizeof(NativePropertiesN<5>) == 8 + 11 * sizeof(void*), "5 size"); +static_assert(sizeof(NativePropertiesN<6>) == 8 + 13 * sizeof(void*), "6 size"); +static_assert(sizeof(NativePropertiesN<7>) == 8 + 15 * sizeof(void*), "7 size"); + +// The "base" type. +typedef NativePropertiesN<7> NativeProperties; + +struct NativePropertiesHolder { + const NativeProperties* regular; + const NativeProperties* chromeOnly; + // Points to a static bool that's set to true once the regular and chromeOnly + // NativeProperties have been inited. This is a pointer to a bool instead of + // a bool value because NativePropertiesHolder is stored by value in + // a static const NativePropertyHooks. + bool* inited; +}; + +struct NativeNamedOrIndexedPropertyHooks { + // The hook to call for resolving indexed or named properties. + ResolveOwnProperty mResolveOwnProperty; + // The hook to call for enumerating indexed or named properties. + EnumerateOwnProperties mEnumerateOwnProperties; + // The hook to call to delete a named property. May be null if there are no + // named properties or no named property deleter. On success (true return) + // the "found" argument will be set to true if there was in fact such a named + // property and false otherwise. If it's set to false, the caller is expected + // to proceed with whatever deletion behavior it would have if there were no + // named properties involved at all (i.e. if the hook were null). If it's set + // to true, it will indicate via opresult whether the delete actually + // succeeded. + DeleteNamedProperty mDeleteNamedProperty; +}; + +// Helper structure for Xrays for DOM binding objects. The same instance is used +// for instances, interface objects and interface prototype objects of a +// specific interface. +struct NativePropertyHooks { + const NativeNamedOrIndexedPropertyHooks* mIndexedOrNamedNativeProperties; + + // The property arrays for this interface. + NativePropertiesHolder mNativeProperties; + + // This will be set to the ID of the interface prototype object for the + // interface, if it has one. If it doesn't have one it will be set to + // prototypes::id::_ID_Count. + prototypes::ID mPrototypeID; + + // This will be set to the ID of the interface object for the interface, if it + // has one. If it doesn't have one it will be set to + // constructors::id::_ID_Count. + constructors::ID mConstructorID; + + // The JSClass to use for expandos on our Xrays. Can be null, in which case + // Xrays will use a default class of their choice. + const JSClass* mXrayExpandoClass; +}; + +enum DOMObjectType : uint8_t { + eInstance, + eGlobalInstance, + eInterface, + eInterfacePrototype, + eGlobalInterfacePrototype, + eNamespace, + eNamedPropertiesObject +}; + +inline bool IsInstance(DOMObjectType type) { + return type == eInstance || type == eGlobalInstance; +} + +inline bool IsInterfacePrototype(DOMObjectType type) { + return type == eInterfacePrototype || type == eGlobalInterfacePrototype; +} + +typedef JSObject* (*AssociatedGlobalGetter)(JSContext* aCx, + JS::Handle<JSObject*> aObj); + +typedef JSObject* (*ProtoGetter)(JSContext* aCx); + +/** + * Returns a handle to the relevant WebIDL prototype object for the current + * compartment global (which may be a handle to null on out of memory). Once + * allocated, the prototype object is guaranteed to exist as long as the global + * does, since the global traces its array of WebIDL prototypes and + * constructors. + */ +typedef JS::Handle<JSObject*> (*ProtoHandleGetter)(JSContext* aCx); + +/** + * Serializes a WebIDL object for structured cloning. aObj may not be in the + * compartment of aCx in cases when we were working with a cross-compartment + * wrapper. aObj is expected to be an object of the DOMJSClass that we got the + * serializer from. + */ +typedef bool (*WebIDLSerializer)(JSContext* aCx, + JSStructuredCloneWriter* aWriter, + JS::Handle<JSObject*> aObj); + +/** + * Deserializes a WebIDL object from a structured clone serialization. + */ +typedef JSObject* (*WebIDLDeserializer)(JSContext* aCx, + nsIGlobalObject* aGlobal, + JSStructuredCloneReader* aReader); + +typedef nsWrapperCache* (*WrapperCacheGetter)(JS::Handle<JSObject*> aObj); + +// Special JSClass for reflected DOM objects. +struct DOMJSClass { + // It would be nice to just inherit from JSClass, but that precludes pure + // compile-time initialization of the form |DOMJSClass = {...};|, since C++ + // only allows brace initialization for aggregate/POD types. + const JSClass mBase; + + // A list of interfaces that this object implements, in order of decreasing + // derivedness. + const prototypes::ID mInterfaceChain[MAX_PROTOTYPE_CHAIN_LENGTH]; + + // We store the DOM object in reserved slot with index DOM_OBJECT_SLOT or in + // the proxy private if we use a proxy object. + // Sometimes it's an nsISupports and sometimes it's not; this class tells + // us which it is. + const bool mDOMObjectIsISupports; + + const NativePropertyHooks* mNativeHooks; + + // A callback to find the associated global for our C++ object. Note that + // this is used in cases when that global is _changing_, so it will not match + // the global of the JSObject* passed in to this function! + AssociatedGlobalGetter mGetAssociatedGlobal; + ProtoHandleGetter mGetProto; + + // This stores the CC participant for the native, null if this class does not + // implement cycle collection or if it inherits from nsISupports (we can get + // the CC participant by QI'ing in that case). + nsCycleCollectionParticipant* mParticipant; + + // The serializer for this class if the relevant object is [Serializable]. + // Null otherwise. + WebIDLSerializer mSerializer; + + // A callback to get the wrapper cache for C++ objects that don't inherit from + // nsISupports, or null. + WrapperCacheGetter mWrapperCacheGetter; + + static const DOMJSClass* FromJSClass(const JSClass* base) { + MOZ_ASSERT(base->flags & JSCLASS_IS_DOMJSCLASS); + return reinterpret_cast<const DOMJSClass*>(base); + } + + const JSClass* ToJSClass() const { return &mBase; } +}; + +// Special JSClass for DOM interface and interface prototype objects. +struct DOMIfaceAndProtoJSClass { + // It would be nice to just inherit from JSClass, but that precludes pure + // compile-time initialization of the form + // |DOMJSInterfaceAndPrototypeClass = {...};|, since C++ only allows brace + // initialization for aggregate/POD types. + const JSClass mBase; + + // Either eInterface, eNamespace, eInterfacePrototype, + // eGlobalInterfacePrototype or eNamedPropertiesObject. + DOMObjectType mType; // uint8_t + + const prototypes::ID mPrototypeID; // uint16_t + const uint32_t mDepth; + + const NativePropertyHooks* mNativeHooks; + + ProtoGetter mGetParentProto; + + static const DOMIfaceAndProtoJSClass* FromJSClass(const JSClass* base) { + MOZ_ASSERT(base->flags & JSCLASS_IS_DOMIFACEANDPROTOJSCLASS); + return reinterpret_cast<const DOMIfaceAndProtoJSClass*>(base); + } + + const JSClass* ToJSClass() const { return &mBase; } +}; + +// Special JSClass for DOM interface objects. +struct DOMIfaceJSClass : public DOMIfaceAndProtoJSClass { + // Boolean indicating whether this object wants an isInstance property + // pointing to InterfaceIsInstance defined on it. Only ever true for the + // eInterface case. + bool wantsInterfaceIsInstance; + + // The value to return for Function.prototype.toString on this interface + // object. + const char* mFunToString; + + static const DOMIfaceJSClass* FromJSClass(const JSClass* base) { + const DOMIfaceAndProtoJSClass* clazz = + DOMIfaceAndProtoJSClass::FromJSClass(base); + MOZ_ASSERT(clazz->mType == eInterface || clazz->mType == eNamespace); + return static_cast<const DOMIfaceJSClass*>(clazz); + } +}; + +class ProtoAndIfaceCache; + +inline bool DOMGlobalHasProtoAndIFaceCache(JSObject* global) { + MOZ_DIAGNOSTIC_ASSERT(JS::GetClass(global)->flags & JSCLASS_DOM_GLOBAL); + // This can be undefined if we GC while creating the global + return !JS::GetReservedSlot(global, DOM_PROTOTYPE_SLOT).isUndefined(); +} + +inline bool HasProtoAndIfaceCache(JSObject* global) { + if (!(JS::GetClass(global)->flags & JSCLASS_DOM_GLOBAL)) { + return false; + } + return DOMGlobalHasProtoAndIFaceCache(global); +} + +inline ProtoAndIfaceCache* GetProtoAndIfaceCache(JSObject* global) { + MOZ_DIAGNOSTIC_ASSERT(JS::GetClass(global)->flags & JSCLASS_DOM_GLOBAL); + return static_cast<ProtoAndIfaceCache*>( + JS::GetReservedSlot(global, DOM_PROTOTYPE_SLOT).toPrivate()); +} + +} // namespace mozilla::dom + +#endif /* mozilla_dom_DOMJSClass_h */ |