1 files changed, 84 insertions, 0 deletions
diff --git a/dom/bindings/ErrorIPCUtils.h b/dom/bindings/ErrorIPCUtils.h
new file mode 100644
index 000000000..0e60d8174
--- /dev/null
+++ b/dom/bindings/ErrorIPCUtils.h
@@ -0,0 +1,84 @@
+/* -*- 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 "ipc/IPCMessageUtils.h"
+#include "mozilla/ErrorResult.h"
+#include "mozilla/Assertions.h"
+#include "mozilla/Move.h"
+
+#ifndef IPC_ErrorIPCUtils_h
+#define IPC_ErrorIPCUtils_h
+
+namespace IPC {
+
+template<>
+struct ParamTraits<mozilla::dom::ErrNum> :
+  public ContiguousEnumSerializer<mozilla::dom::ErrNum,
+                                  mozilla::dom::ErrNum(0),
+                                  mozilla::dom::ErrNum(mozilla::dom::Err_Limit)> {};
+
+template<>
+struct ParamTraits<mozilla::ErrorResult>
+{
+  typedef mozilla::ErrorResult paramType;
+
+  static void Write(Message* aMsg, const paramType& aParam)
+  {
+    // It should be the case that mMightHaveUnreportedJSException can only be
+    // true when we're expecting a JS exception.  We cannot send such messages
+    // over the IPC channel since there is no sane way of transferring the JS
+    // value over to the other side.  Callers should never do that.
+    MOZ_ASSERT_IF(aParam.IsJSException(), aParam.mMightHaveUnreportedJSException);
+    if (aParam.IsJSException()
+#ifdef DEBUG
+        || aParam.mMightHaveUnreportedJSException
+#endif
+        ) {
+      MOZ_CRASH("Cannot encode an ErrorResult representing a Javascript exception");
+    }
+
+    WriteParam(aMsg, aParam.mResult);
+    WriteParam(aMsg, aParam.IsErrorWithMessage());
+    WriteParam(aMsg, aParam.IsDOMException());
+    if (aParam.IsErrorWithMessage()) {
+      aParam.SerializeMessage(aMsg);
+    } else if (aParam.IsDOMException()) {
+      aParam.SerializeDOMExceptionInfo(aMsg);
+    }
+  }
+
+  static bool Read(const Message* aMsg, PickleIterator* aIter, paramType* aResult)
+  {
+    paramType readValue;
+    if (!ReadParam(aMsg, aIter, &readValue.mResult)) {
+      return false;
+    }
+    bool hasMessage = false;
+    if (!ReadParam(aMsg, aIter, &hasMessage)) {
+      return false;
+    }
+    bool hasDOMExceptionInfo = false;
+    if (!ReadParam(aMsg, aIter, &hasDOMExceptionInfo)) {
+      return false;
+    }
+    if (hasMessage && hasDOMExceptionInfo) {
+      // Shouldn't have both!
+      return false;
+    }
+    if (hasMessage && !readValue.DeserializeMessage(aMsg, aIter)) {
+      return false;
+    } else if (hasDOMExceptionInfo &&
+               !readValue.DeserializeDOMExceptionInfo(aMsg, aIter)) {
+      return false;
+    }
+    *aResult = Move(readValue);
+    return true;
+  }
+};
+
+} // namespace IPC
+
+#endif