import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

dom/bindings/SimpleGlobalObject.cpp

@@ -0,0 +1,176 @@
+/* -*- 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/. */
+
+#include "mozilla/dom/SimpleGlobalObject.h"
+
+#include "jsapi.h"
+#include "js/Class.h"
+
+#include "nsJSPrincipals.h"
+#include "nsNullPrincipal.h"
+#include "nsThreadUtils.h"
+#include "nsContentUtils.h"
+
+#include "xpcprivate.h"
+
+#include "mozilla/dom/ScriptSettings.h"
+
+namespace mozilla {
+namespace dom {
+
+NS_IMPL_CYCLE_COLLECTION_CLASS(SimpleGlobalObject)
+
+NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(SimpleGlobalObject)
+  NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
+  tmp->UnlinkHostObjectURIs();
+NS_IMPL_CYCLE_COLLECTION_UNLINK_END
+
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(SimpleGlobalObject)
+
+  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
+  tmp->TraverseHostObjectURIs(cb);
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
+
+NS_IMPL_CYCLE_COLLECTION_TRACE_WRAPPERCACHE(SimpleGlobalObject)
+
+NS_IMPL_CYCLE_COLLECTING_ADDREF(SimpleGlobalObject)
+NS_IMPL_CYCLE_COLLECTING_RELEASE(SimpleGlobalObject)
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(SimpleGlobalObject)
+  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
+  NS_INTERFACE_MAP_ENTRY(nsIGlobalObject)
+NS_INTERFACE_MAP_END
+
+static void
+SimpleGlobal_finalize(js::FreeOp *fop, JSObject *obj)
+{
+  SimpleGlobalObject* globalObject =
+    static_cast<SimpleGlobalObject*>(JS_GetPrivate(obj));
+  NS_RELEASE(globalObject);
+}
+
+static void
+SimpleGlobal_moved(JSObject *obj, const JSObject *old)
+{
+  SimpleGlobalObject* globalObject =
+    static_cast<SimpleGlobalObject*>(JS_GetPrivate(obj));
+  globalObject->UpdateWrapper(obj, old);
+}
+
+static const js::ClassOps SimpleGlobalClassOps = {
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    JS_EnumerateStandardClasses,
+    JS_ResolveStandardClass,
+    JS_MayResolveStandardClass,
+    SimpleGlobal_finalize,
+    nullptr,
+    nullptr,
+    nullptr,
+    JS_GlobalObjectTraceHook,
+};
+
+static const js::ClassExtension SimpleGlobalClassExtension = {
+  nullptr,
+  SimpleGlobal_moved
+};
+
+const js::Class SimpleGlobalClass = {
+    "",
+    JSCLASS_GLOBAL_FLAGS |
+    JSCLASS_HAS_PRIVATE |
+    JSCLASS_PRIVATE_IS_NSISUPPORTS |
+    JSCLASS_FOREGROUND_FINALIZE,
+    &SimpleGlobalClassOps,
+    JS_NULL_CLASS_SPEC,
+    &SimpleGlobalClassExtension,
+    JS_NULL_OBJECT_OPS
+};
+
+// static
+JSObject*
+SimpleGlobalObject::Create(GlobalType globalType, JS::Handle<JS::Value> proto)
+{
+  // We can't root our return value with our AutoJSAPI because the rooting
+  // analysis thinks ~AutoJSAPI can GC.  So we need to root in a scope outside
+  // the lifetime of the AutoJSAPI.
+  JS::Rooted<JSObject*> global(RootingCx());
+
+  { // Scope to ensure the AutoJSAPI destructor runs before we end up returning
+    AutoJSAPI jsapi;
+    jsapi.Init();
+    JSContext* cx = jsapi.cx();
+
+    JS::CompartmentOptions options;
+    options.creationOptions().setInvisibleToDebugger(true);
+
+    if (NS_IsMainThread()) {
+      nsCOMPtr<nsIPrincipal> principal = nsNullPrincipal::Create();
+      options.creationOptions().setTrace(xpc::TraceXPCGlobal);
+      global = xpc::CreateGlobalObject(cx, js::Jsvalify(&SimpleGlobalClass),
+                                       nsJSPrincipals::get(principal),
+                                       options);
+    } else {
+      global = JS_NewGlobalObject(cx, js::Jsvalify(&SimpleGlobalClass),
+                                  nullptr,
+                                  JS::DontFireOnNewGlobalHook, options);
+    }
+
+    if (!global) {
+      jsapi.ClearException();
+      return nullptr;
+    }
+
+    JSAutoCompartment ac(cx, global);
+
+    // It's important to create the nsIGlobalObject for our new global before we
+    // start trying to wrap things like the prototype into its compartment,
+    // because the wrap operation relies on the global having its
+    // nsIGlobalObject already.
+    RefPtr<SimpleGlobalObject> globalObject =
+      new SimpleGlobalObject(global, globalType);
+
+    // Pass on ownership of globalObject to |global|.
+    JS_SetPrivate(global, globalObject.forget().take());
+
+    if (proto.isObjectOrNull()) {
+      JS::Rooted<JSObject*> protoObj(cx, proto.toObjectOrNull());
+      if (!JS_WrapObject(cx, &protoObj)) {
+        jsapi.ClearException();
+        return nullptr;
+      }
+
+      if (!JS_SplicePrototype(cx, global, protoObj)) {
+        jsapi.ClearException();
+        return nullptr;
+      }
+    } else if (!proto.isUndefined()) {
+      // Bogus proto.
+      return nullptr;
+    }
+
+    JS_FireOnNewGlobalObject(cx, global);
+  }
+
+  return global;
+}
+
+// static
+SimpleGlobalObject::GlobalType
+SimpleGlobalObject::SimpleGlobalType(JSObject* obj)
+{
+  if (js::GetObjectClass(obj) != &SimpleGlobalClass) {
+    return SimpleGlobalObject::GlobalType::NotSimpleGlobal;
+  }
+
+  SimpleGlobalObject* globalObject =
+    static_cast<SimpleGlobalObject*>(JS_GetPrivate(obj));
+  return globalObject->Type();
+}
+
+} // namespace mozilla
+} // namespace dom