1 files changed, 58 insertions, 0 deletions
diff --git a/dom/quota/QMResult.h b/dom/quota/QMResult.h
new file mode 100644
index 0000000000..f47c82584e
--- /dev/null
+++ b/dom/quota/QMResult.h
@@ -0,0 +1,58 @@
+/* -*- 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 DOM_QUOTA_QMRESULT_H_
+#define DOM_QUOTA_QMRESULT_H_
+
+#include "ErrorList.h"
+#include "mozilla/dom/quota/Config.h"
+#include "mozilla/dom/quota/ForwardDecls.h"
+
+namespace mozilla {
+
+#ifdef QM_ERROR_STACKS_ENABLED
+// A wrapped nsresult, primarily intended for use along with mozilla::Result
+// and QM_TRY macros. The wrapper contains stack id and frame id which are
+// reported in LogError besides the error result itself.
+//
+// XXX Document the general situation more, bug 1709777.
+class QMResult {
+  uint64_t mStackId;
+  uint32_t mFrameId;
+  nsresult mNSResult;
+
+ public:
+  QMResult() : QMResult(NS_OK) {}
+
+  explicit QMResult(nsresult aNSResult);
+
+  uint64_t StackId() const { return mStackId; }
+
+  uint32_t FrameId() const { return mFrameId; }
+
+  nsresult NSResult() const { return mNSResult; }
+
+  /**
+   * Propagate the result.
+   *
+   * This is used by GenericErrorResult<QMResult> to create a propagated
+   * result.
+   */
+  QMResult Propagate() const {
+    return QMResult{mStackId, mFrameId + 1, mNSResult};
+  }
+
+ private:
+  QMResult(uint64_t aStackId, uint32_t aFrameId, nsresult aNSResult)
+      : mStackId(aStackId), mFrameId(aFrameId), mNSResult(aNSResult) {}
+};
+#endif
+
+inline QMResult ToQMResult(nsresult aValue) { return QMResult(aValue); }
+
+}  // namespace mozilla
+
+#endif