mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
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125 lines
3.9 KiB
C++
125 lines
3.9 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 "jsapi.h"
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#include "jsfriendapi.h"
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#include "mozilla/dom/PrototypeList.h" // auto-generated
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class nsCycleCollectionParticipant;
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// We use slot 0 for holding the raw object. This is safe for both
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// globals and non-globals.
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#define DOM_OBJECT_SLOT 0
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// We use slot 1 for holding the expando object. This is not safe for globals
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// until bug 760095 is fixed, so that bug blocks converting Window to new
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// bindings.
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#define DOM_XRAY_EXPANDO_SLOT 1
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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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// We use these flag bits for the new bindings.
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#define JSCLASS_DOM_GLOBAL JSCLASS_USERBIT1
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// NOTE: This is baked into the Ion JIT as 0 in codegen for LGetDOMProperty and
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// LSetDOMProperty. Those constants need to be changed accordingly if this value
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// changes.
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#define DOM_PROTO_INSTANCE_CLASS_SLOT 0
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namespace mozilla {
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namespace dom {
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typedef bool
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(* ResolveProperty)(JSContext* cx, JSObject* wrapper, jsid id, bool set,
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JSPropertyDescriptor* desc);
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typedef bool
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(* EnumerateProperties)(JSContext* cx, JSObject* wrapper,
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JS::AutoIdVector& props);
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struct NativePropertyHooks
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{
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ResolveProperty mResolveOwnProperty;
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ResolveProperty mResolveProperty;
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EnumerateProperties mEnumerateOwnProperties;
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EnumerateProperties mEnumerateProperties;
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const NativePropertyHooks *mProtoHooks;
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};
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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[prototypes::id::_ID_Count];
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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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// 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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JSClass mBase;
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DOMClass mClass;
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static DOMJSClass* FromJSClass(JSClass* base) {
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MOZ_ASSERT(base->flags & JSCLASS_IS_DOMJSCLASS);
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return reinterpret_cast<DOMJSClass*>(base);
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}
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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 DOMJSClass* FromJSClass(js::Class* base) {
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return FromJSClass(Jsvalify(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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JSClass* ToJSClass() { 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 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<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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