1 files changed, 68 insertions, 0 deletions
diff --git a/js/xpconnect/wrappers/WrapperFactory.h b/js/xpconnect/wrappers/WrapperFactory.h
new file mode 100644
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+++ b/js/xpconnect/wrappers/WrapperFactory.h
@@ -0,0 +1,68 @@
+/* -*- 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/. */
+
+#ifndef _xpc_WRAPPERFACTORY_H
+#define _xpc_WRAPPERFACTORY_H
+
+#include "jswrapper.h"
+
+namespace xpc {
+
+class WrapperFactory {
+  public:
+    enum { WAIVE_XRAY_WRAPPER_FLAG = js::Wrapper::LAST_USED_FLAG << 1,
+           IS_XRAY_WRAPPER_FLAG    = WAIVE_XRAY_WRAPPER_FLAG << 1 };
+
+    // Return true if any of any of the nested wrappers have the flag set.
+    static bool HasWrapperFlag(JSObject* wrapper, unsigned flag) {
+        unsigned flags = 0;
+        js::UncheckedUnwrap(wrapper, true, &flags);
+        return !!(flags & flag);
+    }
+
+    static bool IsXrayWrapper(JSObject* wrapper) {
+        return HasWrapperFlag(wrapper, IS_XRAY_WRAPPER_FLAG);
+    }
+
+    static bool HasWaiveXrayFlag(JSObject* wrapper) {
+        return HasWrapperFlag(wrapper, WAIVE_XRAY_WRAPPER_FLAG);
+    }
+
+    static bool IsCOW(JSObject* wrapper);
+
+    static JSObject* GetXrayWaiver(JS::HandleObject obj);
+    static JSObject* CreateXrayWaiver(JSContext* cx, JS::HandleObject obj);
+    static JSObject* WaiveXray(JSContext* cx, JSObject* obj);
+
+    // Computes whether we should allow the creation of an Xray waiver from
+    // |target| to |origin|.
+    static bool AllowWaiver(JSCompartment* target, JSCompartment* origin);
+
+    // Convenience method for the above, operating on a wrapper.
+    static bool AllowWaiver(JSObject* wrapper);
+
+    // Prepare a given object for wrapping in a new compartment.
+    static void PrepareForWrapping(JSContext* cx,
+                                   JS::HandleObject scope,
+                                   JS::HandleObject obj,
+                                   JS::HandleObject objectPassedToWrap,
+                                   JS::MutableHandleObject retObj);
+
+    // Rewrap an object that is about to cross compartment boundaries.
+    static JSObject* Rewrap(JSContext* cx,
+                            JS::HandleObject existing,
+                            JS::HandleObject obj);
+
+    // Wrap wrapped object into a waiver wrapper and then re-wrap it.
+    static bool WaiveXrayAndWrap(JSContext* cx, JS::MutableHandleValue vp);
+    static bool WaiveXrayAndWrap(JSContext* cx, JS::MutableHandleObject object);
+};
+
+extern const js::Wrapper XrayWaiver;
+
+} // namespace xpc
+
+#endif /* _xpc_WRAPPERFACTORY_H */