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2104ae00bb
This needs to be on the compartment to prevent creating duplicate wrapped natives. We now also allocate these objects in the compartment's first global for consistency and to prevent leaks. XPCWrappedNativeScope also stores the content XBL scope. I considered moving this to RealmPrivate, but given the fate of in-content XBL I went with the simpler option of keeping it on XPCWrappedNativeScope and release-asserting we have a single realm in the XBL case. Because XPCWrappedNativeScope no longer stores a global object, we no longer need XPCWrappedNativeScope::TraceSelf, XPCWrappedNativeProto::TraceInside and XPC_WN_Proto_Trace. Differential Revision: https://phabricator.services.mozilla.com/D14849 --HG-- extra : moz-landing-system : lando
123 lines
4.2 KiB
C++
123 lines
4.2 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* vim: set ts=8 sts=2 et sw=2 tw=80:
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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
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef js_Realm_h
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#define js_Realm_h
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#include "jspubtd.h"
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#include "js/GCPolicyAPI.h"
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#include "js/TypeDecls.h" // forward-declaration of JS::Realm
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namespace js {
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namespace gc {
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JS_PUBLIC_API void TraceRealm(JSTracer* trc, JS::Realm* realm,
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const char* name);
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JS_PUBLIC_API bool RealmNeedsSweep(JS::Realm* realm);
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JS_PUBLIC_API bool AllRealmsNeedSweep(JS::Compartment* comp);
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} // namespace gc
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} // namespace js
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namespace JS {
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// Each Realm holds a strong reference to its GlobalObject, and vice versa.
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template <>
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struct GCPolicy<Realm*> : public NonGCPointerPolicy<Realm*> {
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static void trace(JSTracer* trc, Realm** vp, const char* name) {
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if (*vp) {
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::js::gc::TraceRealm(trc, *vp, name);
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}
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}
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static bool needsSweep(Realm** vp) {
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return *vp && ::js::gc::RealmNeedsSweep(*vp);
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}
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};
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// Get the current realm, if any. The ECMAScript spec calls this "the current
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// Realm Record".
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extern JS_PUBLIC_API Realm* GetCurrentRealmOrNull(JSContext* cx);
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namespace shadow {
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class Realm {
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protected:
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JS::Compartment* compartment_;
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explicit Realm(JS::Compartment* comp) : compartment_(comp) {}
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public:
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JS::Compartment* compartment() { return compartment_; }
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static shadow::Realm* get(JS::Realm* realm) {
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return reinterpret_cast<shadow::Realm*>(realm);
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}
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};
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}; // namespace shadow
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// Return the compartment that contains a given realm.
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inline JS::Compartment* GetCompartmentForRealm(Realm* realm) {
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return shadow::Realm::get(realm)->compartment();
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}
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// Return an object's realm. All objects except cross-compartment wrappers are
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// created in a particular realm, which never changes. Returns null if obj is
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// a cross-compartment wrapper.
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extern JS_PUBLIC_API Realm* GetObjectRealmOrNull(JSObject* obj);
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// Get the value of the "private data" internal field of the given Realm.
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// This field is initially null and is set using SetRealmPrivate.
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// It's a pointer to embeddding-specific data that SpiderMonkey never uses.
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extern JS_PUBLIC_API void* GetRealmPrivate(Realm* realm);
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// Set the "private data" internal field of the given Realm.
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extern JS_PUBLIC_API void SetRealmPrivate(Realm* realm, void* data);
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typedef void (*DestroyRealmCallback)(JSFreeOp* fop, Realm* realm);
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// Set the callback SpiderMonkey calls just before garbage-collecting a realm.
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// Embeddings can use this callback to free private data associated with the
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// realm via SetRealmPrivate.
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//
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// By the time this is called, the global object for the realm has already been
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// collected.
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extern JS_PUBLIC_API void SetDestroyRealmCallback(
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JSContext* cx, DestroyRealmCallback callback);
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typedef void (*RealmNameCallback)(JSContext* cx, Handle<Realm*> realm,
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char* buf, size_t bufsize);
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// Set the callback SpiderMonkey calls to get the name of a realm, for
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// diagnostic output.
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extern JS_PUBLIC_API void SetRealmNameCallback(JSContext* cx,
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RealmNameCallback callback);
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// Get the global object for the given realm. This only returns nullptr during
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// GC, between collecting the global object and destroying the Realm.
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extern JS_PUBLIC_API JSObject* GetRealmGlobalOrNull(Handle<Realm*> realm);
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// Initialize standard JS class constructors, prototypes, and any top-level
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// functions and constants associated with the standard classes (e.g. isNaN
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// for Number).
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extern JS_PUBLIC_API bool InitRealmStandardClasses(JSContext* cx);
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/*
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* Ways to get various per-Realm objects. All the getters declared below operate
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* on the JSContext's current Realm.
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*/
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extern JS_PUBLIC_API JSObject* GetRealmObjectPrototype(JSContext* cx);
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extern JS_PUBLIC_API JSObject* GetRealmFunctionPrototype(JSContext* cx);
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extern JS_PUBLIC_API JSObject* GetRealmArrayPrototype(JSContext* cx);
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extern JS_PUBLIC_API JSObject* GetRealmErrorPrototype(JSContext* cx);
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extern JS_PUBLIC_API JSObject* GetRealmIteratorPrototype(JSContext* cx);
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} // namespace JS
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#endif // js_Realm_h
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