Bug 1275315 part 1. Add a Realm.h that defines getters for some standard prototype objects. r=waldo

js/public/Realm.h

@@ -0,0 +1,42 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * vim: set ts=8 sts=4 et sw=4 tw=99:
+ * 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/. */
+
+/*
+ * Ways to get various per-Realm objects. All the getters declared in this
+ * header operate on the Realm corresponding to the current compartment on the
+ * JSContext.
+ */
+
+#ifndef js_Realm_h
+#define js_Realm_h
+
+#include "jstypes.h"
+
+struct JSContext;
+class JSObject;
+
+namespace JS {
+
+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);
+
+} // namespace JS
+
+#endif // js_Realm_h
+
+

js/src/jsapi.h

@@ -31,6 +31,7 @@
 #include "js/HashTable.h"
 #include "js/Id.h"
 #include "js/Principals.h"
+#include "js/Realm.h"
 #include "js/RootingAPI.h"
 #include "js/TracingAPI.h"
 #include "js/Utility.h"

js/src/moz.build

@@ -130,6 +130,7 @@ EXPORTS.js += [
     '../public/ProfilingFrameIterator.h',
     '../public/ProfilingStack.h',
     '../public/Proxy.h',
+    '../public/Realm.h',
     '../public/RequiredDefines.h',
     '../public/RootingAPI.h',
     '../public/SliceBudget.h',
@@ -339,6 +340,7 @@ UNIFIED_SOURCES += [
     'vm/Printer.cpp',
     'vm/Probes.cpp',
     'vm/ProxyObject.cpp',
+    'vm/Realm.cpp',
     'vm/ReceiverGuard.cpp',
     'vm/RegExpObject.cpp',
     'vm/RegExpStatics.cpp',

js/src/vm/GlobalObject.h

@@ -343,6 +343,10 @@ class GlobalObject : public NativeObject
         return &self->getPrototype(JSProto_Object).toObject().as<NativeObject>();
     }
 
+    static NativeObject* getOrCreateObjectPrototype(JSContext* cx, Handle<GlobalObject*> global) {
+        return global->getOrCreateObjectPrototype(cx);
+    }
+
     NativeObject* getOrCreateFunctionPrototype(JSContext* cx) {
         if (functionObjectClassesInitialized())
             return &getPrototype(JSProto_Function).toObject().as<NativeObject>();
@@ -352,6 +356,10 @@ class GlobalObject : public NativeObject
         return &self->getPrototype(JSProto_Function).toObject().as<NativeObject>();
     }
 
+    static NativeObject* getOrCreateFunctionPrototype(JSContext* cx, Handle<GlobalObject*> global) {
+        return global->getOrCreateFunctionPrototype(cx);
+    }
+
     static NativeObject* getOrCreateArrayPrototype(JSContext* cx, Handle<GlobalObject*> global) {
         if (!ensureConstructor(cx, global, JSProto_Array))
             return nullptr;

js/src/vm/Realm.cpp

@@ -0,0 +1,48 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * vim: set ts=8 sts=4 et sw=4 tw=99:
+ * 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/. */
+
+#include "js/Realm.h"
+
+#include "jscntxt.h"
+
+#include "vm/GlobalObject.h"
+
+using namespace js;
+
+JS_PUBLIC_API(JSObject*)
+JS::GetRealmObjectPrototype(JSContext* cx)
+{
+    CHECK_REQUEST(cx);
+    return GlobalObject::getOrCreateObjectPrototype(cx, cx->global());
+}
+
+JS_PUBLIC_API(JSObject*)
+JS::GetRealmFunctionPrototype(JSContext* cx)
+{
+    CHECK_REQUEST(cx);
+    return GlobalObject::getOrCreateFunctionPrototype(cx, cx->global());
+}
+
+JS_PUBLIC_API(JSObject*)
+JS::GetRealmArrayPrototype(JSContext* cx)
+{
+    CHECK_REQUEST(cx);
+    return GlobalObject::getOrCreateArrayPrototype(cx, cx->global());
+}
+
+JS_PUBLIC_API(JSObject*)
+JS::GetRealmErrorPrototype(JSContext* cx)
+{
+    CHECK_REQUEST(cx);
+    return GlobalObject::getOrCreateCustomErrorPrototype(cx, cx->global(), JSEXN_ERR);
+}
+
+JS_PUBLIC_API(JSObject*)
+JS::GetRealmIteratorPrototype(JSContext* cx)
+{
+    CHECK_REQUEST(cx);
+    return GlobalObject::getOrCreateIteratorPrototype(cx, cx->global());
+}