1 files changed, 56 insertions, 0 deletions
diff --git a/gfx/src/gfxCrashReporterUtils.h b/gfx/src/gfxCrashReporterUtils.h
new file mode 100644
index 0000000000..30b670df61
--- /dev/null
+++ b/gfx/src/gfxCrashReporterUtils.h
@@ -0,0 +1,56 @@
+/* -*- 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 gfxCrashReporterUtils_h__
+#define gfxCrashReporterUtils_h__
+
+#include "nsString.h"
+
+namespace mozilla {
+
+/** \class ScopedGfxFeatureReporter
+ *
+ * On creation, adds "FeatureName?" to AppNotes
+ * On destruction, adds "FeatureName-", or "FeatureName+" if you called
+ * SetSuccessful().
+ *
+ * Any such string is added at most once to AppNotes, and is subsequently
+ * skipped.
+ *
+ * This ScopedGfxFeatureReporter class is designed to be fool-proof to use in
+ * functions that have many exit points. We don't want to encourage having
+ * function with many exit points. It just happens that our graphics features
+ * initialization functions are like that.
+ */
+class ScopedGfxFeatureReporter {
+ public:
+  explicit ScopedGfxFeatureReporter(const char* aFeature, bool aForce = false)
+      : mFeature(aFeature), mStatusChar('-'), mStatusNumber(0) {
+    WriteAppNote(aForce ? '!' : '?', 0);
+  }
+  ~ScopedGfxFeatureReporter() { WriteAppNote(mStatusChar, mStatusNumber); }
+  void SetSuccessful() { mStatusChar = '+'; }
+  void SetSuccessful(int32_t aNumber) {
+    mStatusChar = '+';
+    mStatusNumber = aNumber;
+  }
+
+  static void AppNote(const nsACString& aMessage);
+
+  class AppNoteWritingRunnable;
+
+ protected:
+  const char* mFeature;
+  char mStatusChar;
+  int32_t mStatusNumber;
+
+ private:
+  void WriteAppNote(char statusChar, int32_t statusNumber);
+};
+
+}  // end namespace mozilla
+
+#endif  // gfxCrashReporterUtils_h__