зеркало из https://github.com/mozilla/gecko-dev.git
134 строки
4.6 KiB
C++
134 строки
4.6 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/GCAPI.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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} // 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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using RealmNameCallback = void (*)(JSContext* cx, Realm* realm, char* buf,
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size_t bufsize,
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const JS::AutoRequireNoGC& nogc);
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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(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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// Implements https://tc39.github.io/ecma262/#sec-getfunctionrealm
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// 7.3.22 GetFunctionRealm ( obj )
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//
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// WARNING: may return a realm in a different compartment!
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//
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// Will throw an exception and return nullptr when a security wrapper or revoked
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// proxy is encountered.
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extern JS_PUBLIC_API Realm* GetFunctionRealm(JSContext* cx,
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HandleObject objArg);
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} // namespace JS
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#endif // js_Realm_h
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