mirror of
https://github.com/mozilla/gecko-dev.git
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239 lines
7.7 KiB
C++
239 lines
7.7 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-*/
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_dom_DOMJSClass_h
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#define mozilla_dom_DOMJSClass_h
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#include "jsfriendapi.h"
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#include "mozilla/Assertions.h"
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#include "mozilla/dom/PrototypeList.h" // auto-generated
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#include "mozilla/dom/JSSlots.h"
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class nsCycleCollectionParticipant;
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// All DOM globals must have a slot at DOM_PROTOTYPE_SLOT.
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#define DOM_PROTOTYPE_SLOT JSCLASS_GLOBAL_SLOT_COUNT
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// Keep this count up to date with any extra global slots added above.
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#define DOM_GLOBAL_SLOTS 1
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// We use these flag bits for the new bindings.
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#define JSCLASS_DOM_GLOBAL JSCLASS_USERBIT1
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#define JSCLASS_IS_DOMIFACEANDPROTOJSCLASS JSCLASS_USERBIT2
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namespace mozilla {
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namespace dom {
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typedef bool
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(* ResolveOwnProperty)(JSContext* cx, JS::Handle<JSObject*> wrapper,
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JS::Handle<JSObject*> obj, JS::Handle<jsid> id,
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JS::MutableHandle<JSPropertyDescriptor> desc, unsigned flags);
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typedef bool
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(* EnumerateOwnProperties)(JSContext* cx, JS::Handle<JSObject*> wrapper,
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JS::Handle<JSObject*> obj,
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JS::AutoIdVector& props);
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struct ConstantSpec
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{
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const char* name;
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JS::Value value;
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};
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typedef bool (*PropertyEnabled)(JSContext* cx, JSObject* global);
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template<typename T>
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struct Prefable {
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inline bool isEnabled(JSContext* cx, JSObject* obj) const {
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return enabled &&
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(!enabledFunc ||
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enabledFunc(cx, js::GetGlobalForObjectCrossCompartment(obj)));
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}
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// A boolean indicating whether this set of specs is enabled
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bool enabled;
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// A function pointer to a function that can say the property is disabled
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// even if "enabled" is set to true. If the pointer is null the value of
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// "enabled" is used as-is.
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PropertyEnabled enabledFunc;
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// Array of specs, terminated in whatever way is customary for T.
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// Null to indicate a end-of-array for Prefable, when such an
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// indicator is needed.
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const T* specs;
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};
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struct NativeProperties
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{
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const Prefable<const JSFunctionSpec>* staticMethods;
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jsid* staticMethodIds;
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const JSFunctionSpec* staticMethodsSpecs;
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const Prefable<const JSPropertySpec>* staticAttributes;
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jsid* staticAttributeIds;
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const JSPropertySpec* staticAttributeSpecs;
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const Prefable<const JSFunctionSpec>* methods;
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jsid* methodIds;
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const JSFunctionSpec* methodsSpecs;
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const Prefable<const JSPropertySpec>* attributes;
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jsid* attributeIds;
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const JSPropertySpec* attributeSpecs;
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const Prefable<const JSPropertySpec>* unforgeableAttributes;
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jsid* unforgeableAttributeIds;
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const JSPropertySpec* unforgeableAttributeSpecs;
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const Prefable<const ConstantSpec>* constants;
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jsid* constantIds;
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const ConstantSpec* constantSpecs;
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};
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struct NativePropertiesHolder
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{
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const NativeProperties* regular;
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const NativeProperties* chromeOnly;
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};
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// Helper structure for Xrays for DOM binding objects. The same instance is used
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// for instances, interface objects and interface prototype objects of a
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// specific interface.
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struct NativePropertyHooks
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{
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// The hook to call for resolving indexed or named properties. May be null if
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// there can't be any.
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ResolveOwnProperty mResolveOwnProperty;
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// The hook to call for enumerating indexed or named properties. May be null
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// if there can't be any.
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EnumerateOwnProperties mEnumerateOwnProperties;
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// The property arrays for this interface.
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NativePropertiesHolder mNativeProperties;
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// This will be set to the ID of the interface prototype object for the
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// interface, if it has one. If it doesn't have one it will be set to
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// prototypes::id::_ID_Count.
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prototypes::ID mPrototypeID;
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// This will be set to the ID of the interface object for the interface, if it
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// has one. If it doesn't have one it will be set to
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// constructors::id::_ID_Count.
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constructors::ID mConstructorID;
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// The NativePropertyHooks instance for the parent interface.
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const NativePropertyHooks* mProtoHooks;
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};
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enum DOMObjectType {
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eInstance,
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eInterface,
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eInterfacePrototype
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};
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typedef JSObject* (*ParentGetter)(JSContext* aCx, JS::Handle<JSObject*> aObj);
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/**
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* Returns a handle to the relevent WebIDL prototype object for the given global
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* (which may be a handle to null on out of memory). Once allocated, the
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* prototype object is guaranteed to exist as long as the global does, since the
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* global traces its array of WebIDL prototypes and constructors.
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*/
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typedef JS::Handle<JSObject*> (*ProtoGetter)(JSContext* aCx,
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JS::Handle<JSObject*> aGlobal);
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struct DOMClass
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{
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// A list of interfaces that this object implements, in order of decreasing
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// derivedness.
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const prototypes::ID mInterfaceChain[MAX_PROTOTYPE_CHAIN_LENGTH];
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// We store the DOM object in reserved slot with index DOM_OBJECT_SLOT or in
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// the proxy private if we use a proxy object.
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// Sometimes it's an nsISupports and sometimes it's not; this class tells
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// us which it is.
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const bool mDOMObjectIsISupports;
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const NativePropertyHooks* mNativeHooks;
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ParentGetter mGetParent;
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ProtoGetter mGetProto;
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// This stores the CC participant for the native, null if this class is for a
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// worker or for a native inheriting from nsISupports (we can get the CC
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// participant by QI'ing in that case).
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nsCycleCollectionParticipant* mParticipant;
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};
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// Special JSClass for reflected DOM objects.
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struct DOMJSClass
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{
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// It would be nice to just inherit from JSClass, but that precludes pure
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// compile-time initialization of the form |DOMJSClass = {...};|, since C++
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// only allows brace initialization for aggregate/POD types.
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const JSClass mBase;
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const DOMClass mClass;
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static const DOMJSClass* FromJSClass(const JSClass* base) {
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MOZ_ASSERT(base->flags & JSCLASS_IS_DOMJSCLASS);
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return reinterpret_cast<const DOMJSClass*>(base);
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}
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static const DOMJSClass* FromJSClass(const js::Class* base) {
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return FromJSClass(Jsvalify(base));
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}
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const JSClass* ToJSClass() const { return &mBase; }
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};
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// Special JSClass for DOM interface and interface prototype objects.
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struct DOMIfaceAndProtoJSClass
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{
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// It would be nice to just inherit from JSClass, but that precludes pure
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// compile-time initialization of the form
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// |DOMJSInterfaceAndPrototypeClass = {...};|, since C++ only allows brace
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// initialization for aggregate/POD types.
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const JSClass mBase;
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// Either eInterface or eInterfacePrototype
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DOMObjectType mType;
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const NativePropertyHooks* mNativeHooks;
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// The value to return for toString() on this interface or interface prototype
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// object.
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const char* mToString;
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const prototypes::ID mPrototypeID;
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const uint32_t mDepth;
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static const DOMIfaceAndProtoJSClass* FromJSClass(const JSClass* base) {
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MOZ_ASSERT(base->flags & JSCLASS_IS_DOMIFACEANDPROTOJSCLASS);
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return reinterpret_cast<const DOMIfaceAndProtoJSClass*>(base);
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}
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static const DOMIfaceAndProtoJSClass* FromJSClass(const js::Class* base) {
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return FromJSClass(Jsvalify(base));
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}
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const JSClass* ToJSClass() const { return &mBase; }
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};
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inline bool
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HasProtoAndIfaceArray(JSObject* global)
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{
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MOZ_ASSERT(js::GetObjectClass(global)->flags & JSCLASS_DOM_GLOBAL);
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// This can be undefined if we GC while creating the global
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return !js::GetReservedSlot(global, DOM_PROTOTYPE_SLOT).isUndefined();
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}
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inline JS::Heap<JSObject*>*
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GetProtoAndIfaceArray(JSObject* global)
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{
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MOZ_ASSERT(js::GetObjectClass(global)->flags & JSCLASS_DOM_GLOBAL);
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return static_cast<JS::Heap<JSObject*>*>(
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js::GetReservedSlot(global, DOM_PROTOTYPE_SLOT).toPrivate());
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}
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} // namespace dom
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} // namespace mozilla
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#endif /* mozilla_dom_DOMJSClass_h */
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