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-rw-r--r--dom/bindings/ErrorIPCUtils.h106
1 files changed, 106 insertions, 0 deletions
diff --git a/dom/bindings/ErrorIPCUtils.h b/dom/bindings/ErrorIPCUtils.h
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+/* -*- 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/. */
+
+#ifndef IPC_ErrorIPCUtils_h
+#define IPC_ErrorIPCUtils_h
+
+#include <utility>
+
+#include "ipc/EnumSerializer.h"
+#include "ipc/IPCMessageUtils.h"
+#include "mozilla/Assertions.h"
+#include "mozilla/ErrorResult.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(MessageWriter* aWriter, 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(aWriter, aParam.mResult);
+ WriteParam(aWriter, aParam.IsErrorWithMessage());
+ WriteParam(aWriter, aParam.IsDOMException());
+ if (aParam.IsErrorWithMessage()) {
+ aParam.SerializeMessage(aWriter);
+ } else if (aParam.IsDOMException()) {
+ aParam.SerializeDOMExceptionInfo(aWriter);
+ }
+ }
+
+ static void Write(MessageWriter* aWriter, paramType&& aParam) {
+ Write(aWriter, static_cast<const paramType&>(aParam));
+ aParam.SuppressException();
+ }
+
+ static bool Read(MessageReader* aReader, paramType* aResult) {
+ paramType readValue;
+ if (!ReadParam(aReader, &readValue.mResult)) {
+ return false;
+ }
+ bool hasMessage = false;
+ if (!ReadParam(aReader, &hasMessage)) {
+ return false;
+ }
+ bool hasDOMExceptionInfo = false;
+ if (!ReadParam(aReader, &hasDOMExceptionInfo)) {
+ return false;
+ }
+ if (hasMessage && hasDOMExceptionInfo) {
+ // Shouldn't have both!
+ return false;
+ }
+ if (hasMessage && !readValue.DeserializeMessage(aReader)) {
+ return false;
+ } else if (hasDOMExceptionInfo &&
+ !readValue.DeserializeDOMExceptionInfo(aReader)) {
+ return false;
+ }
+ *aResult = std::move(readValue);
+ return true;
+ }
+};
+
+template <>
+struct ParamTraits<mozilla::CopyableErrorResult> {
+ typedef mozilla::CopyableErrorResult paramType;
+
+ static void Write(MessageWriter* aWriter, const paramType& aParam) {
+ ParamTraits<mozilla::ErrorResult>::Write(aWriter, aParam);
+ }
+
+ static bool Read(MessageReader* aReader, paramType* aResult) {
+ // We can't cast *aResult to ErrorResult&, so cheat and just cast
+ // to ErrorResult*.
+ return ParamTraits<mozilla::ErrorResult>::Read(
+ aReader, reinterpret_cast<mozilla::ErrorResult*>(aResult));
+ }
+};
+
+} // namespace IPC
+
+#endif