зеркало из https://github.com/mozilla/gecko-dev.git
143 строки
4.1 KiB
C++
143 строки
4.1 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* vim: set ts=8 sts=4 et sw=4 tw=99:
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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, const char* name);
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JS_PUBLIC_API bool RealmNeedsSweep(JS::Realm* realm);
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}
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}
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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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{
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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*
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GetCurrentRealmOrNull(JSContext* cx);
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namespace shadow {
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class Realm
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{
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protected:
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JS::Compartment* compartment_;
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explicit Realm(JS::Compartment* comp)
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: compartment_(comp)
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{}
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public:
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JS::Compartment* compartment() {
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return compartment_;
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}
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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*
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GetCompartmentForRealm(Realm* realm)
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{
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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*
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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*
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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
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SetRealmPrivate(Realm* realm, void* data);
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typedef void
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(* 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
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SetDestroyRealmCallback(JSContext* cx, DestroyRealmCallback callback);
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typedef void
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(* RealmNameCallback)(JSContext* cx, Handle<Realm*> realm, 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
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SetRealmNameCallback(JSContext* cx, 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*
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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
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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*
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GetRealmObjectPrototype(JSContext* cx);
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extern JS_PUBLIC_API JSObject*
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GetRealmFunctionPrototype(JSContext* cx);
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extern JS_PUBLIC_API JSObject*
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GetRealmArrayPrototype(JSContext* cx);
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extern JS_PUBLIC_API JSObject*
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GetRealmErrorPrototype(JSContext* cx);
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extern JS_PUBLIC_API JSObject*
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GetRealmIteratorPrototype(JSContext* cx);
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} // namespace JS
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#endif // js_Realm_h
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