1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
|
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: set ts=8 sts=2 et sw=2 tw=80:
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef js_Realm_h
#define js_Realm_h
#include "js/shadow/Realm.h" // JS::shadow::Realm
#include "jspubtd.h"
#include "js/GCAPI.h"
#include "js/GCPolicyAPI.h"
#include "js/TypeDecls.h" // forward-declaration of JS::Realm
namespace js {
namespace gc {
JS_PUBLIC_API void TraceRealm(JSTracer* trc, JS::Realm* realm,
const char* name);
JS_PUBLIC_API bool RealmNeedsSweep(JS::Realm* realm);
} // namespace gc
} // namespace js
namespace JS {
// Each Realm holds a strong reference to its GlobalObject, and vice versa.
template <>
struct GCPolicy<Realm*> : public NonGCPointerPolicy<Realm*> {
static void trace(JSTracer* trc, Realm** vp, const char* name) {
if (*vp) {
::js::gc::TraceRealm(trc, *vp, name);
}
}
static bool needsSweep(Realm** vp) {
return *vp && ::js::gc::RealmNeedsSweep(*vp);
}
};
// Get the current realm, if any. The ECMAScript spec calls this "the current
// Realm Record".
extern JS_PUBLIC_API Realm* GetCurrentRealmOrNull(JSContext* cx);
// Return the compartment that contains a given realm.
inline JS::Compartment* GetCompartmentForRealm(Realm* realm) {
return shadow::Realm::get(realm)->compartment();
}
// Return an object's realm. All objects except cross-compartment wrappers are
// created in a particular realm, which never changes. Returns null if obj is
// a cross-compartment wrapper.
extern JS_PUBLIC_API Realm* GetObjectRealmOrNull(JSObject* obj);
// Get the value of the "private data" internal field of the given Realm.
// This field is initially null and is set using SetRealmPrivate.
// It's a pointer to embeddding-specific data that SpiderMonkey never uses.
extern JS_PUBLIC_API void* GetRealmPrivate(Realm* realm);
// Set the "private data" internal field of the given Realm.
extern JS_PUBLIC_API void SetRealmPrivate(Realm* realm, void* data);
typedef void (*DestroyRealmCallback)(JSFreeOp* fop, Realm* realm);
// Set the callback SpiderMonkey calls just before garbage-collecting a realm.
// Embeddings can use this callback to free private data associated with the
// realm via SetRealmPrivate.
//
// By the time this is called, the global object for the realm has already been
// collected.
extern JS_PUBLIC_API void SetDestroyRealmCallback(
JSContext* cx, DestroyRealmCallback callback);
using RealmNameCallback = void (*)(JSContext* cx, Realm* realm, char* buf,
size_t bufsize,
const JS::AutoRequireNoGC& nogc);
// Set the callback SpiderMonkey calls to get the name of a realm, for
// diagnostic output.
extern JS_PUBLIC_API void SetRealmNameCallback(JSContext* cx,
RealmNameCallback callback);
// Get the global object for the given realm. This only returns nullptr during
// GC, between collecting the global object and destroying the Realm.
extern JS_PUBLIC_API JSObject* GetRealmGlobalOrNull(Realm* realm);
// Initialize standard JS class constructors, prototypes, and any top-level
// functions and constants associated with the standard classes (e.g. isNaN
// for Number).
extern JS_PUBLIC_API bool InitRealmStandardClasses(JSContext* cx);
/*
* Ways to get various per-Realm objects. All the getters declared below operate
* on the JSContext's current Realm.
*/
extern JS_PUBLIC_API JSObject* GetRealmObjectPrototype(JSContext* cx);
extern JS_PUBLIC_API JSObject* GetRealmFunctionPrototype(JSContext* cx);
extern JS_PUBLIC_API JSObject* GetRealmArrayPrototype(JSContext* cx);
extern JS_PUBLIC_API JSObject* GetRealmErrorPrototype(JSContext* cx);
extern JS_PUBLIC_API JSObject* GetRealmIteratorPrototype(JSContext* cx);
// Implements https://tc39.github.io/ecma262/#sec-getfunctionrealm
// 7.3.22 GetFunctionRealm ( obj )
//
// WARNING: may return a realm in a different compartment!
//
// Will throw an exception and return nullptr when a security wrapper or revoked
// proxy is encountered.
extern JS_PUBLIC_API Realm* GetFunctionRealm(JSContext* cx,
HandleObject objArg);
} // namespace JS
#endif // js_Realm_h
|
