1 files changed, 70 insertions, 0 deletions
diff --git a/js/src/vm/WindowProxy.cpp b/js/src/vm/WindowProxy.cpp
new file mode 100644
index 0000000000..60f8160ed4
--- /dev/null
+++ b/js/src/vm/WindowProxy.cpp
@@ -0,0 +1,70 @@
+/* -*- 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/. */
+
+/* WindowProxy and Window implementation, for the web browser embedding. */
+
+#include "js/friend/WindowProxy.h"
+
+#include "mozilla/Assertions.h"  // MOZ_ASSERT
+
+#include "js/Context.h"       // js::AssertHeapIsIdle
+#include "vm/GlobalObject.h"  // js::GlobalObject
+#include "vm/JSContext.h"     // JSContext, CHECK_THREAD
+#include "vm/JSObject.h"      // JSObject
+#include "vm/Runtime.h"       // JSRuntime
+
+#include "vm/JSContext-inl.h"  // JSContext::check
+#include "vm/JSObject-inl.h"   // JSObject::nonCCWGlobal
+
+using JS::Handle;
+
+void js::SetWindowProxyClass(JSContext* cx, const JSClass* clasp) {
+  MOZ_ASSERT(!cx->runtime()->maybeWindowProxyClass());
+  cx->runtime()->setWindowProxyClass(clasp);
+}
+
+void js::SetWindowProxy(JSContext* cx, Handle<JSObject*> global,
+                        Handle<JSObject*> windowProxy) {
+  AssertHeapIsIdle();
+  CHECK_THREAD(cx);
+
+  cx->check(global, windowProxy);
+  MOZ_ASSERT(IsWindowProxy(windowProxy));
+
+  GlobalObject& globalObj = global->as<GlobalObject>();
+  if (globalObj.maybeWindowProxy() != windowProxy) {
+    globalObj.setWindowProxy(windowProxy);
+    globalObj.lexicalEnvironment().setWindowProxyThisObject(windowProxy);
+  }
+}
+
+JSObject* js::ToWindowIfWindowProxy(JSObject* obj) {
+  if (IsWindowProxy(obj)) {
+    return &obj->nonCCWGlobal();
+  }
+
+  return obj;
+}
+
+JSObject* js::detail::ToWindowProxyIfWindowSlow(JSObject* obj) {
+  if (JSObject* windowProxy = obj->as<GlobalObject>().maybeWindowProxy()) {
+    return windowProxy;
+  }
+
+  return obj;
+}
+
+bool js::IsWindowProxy(JSObject* obj) {
+  // Note: simply checking `obj == obj->global().windowProxy()` is not
+  // sufficient: we may have transplanted the window proxy with a CCW.
+  // Check the Class to ensure we really have a window proxy.
+  return obj->getClass() ==
+         obj->runtimeFromAnyThread()->maybeWindowProxyClass();
+}
+
+bool js::detail::IsWindowSlow(JSObject* obj) {
+  return obj->as<GlobalObject>().maybeWindowProxy();
+}