1 files changed, 62 insertions, 0 deletions
diff --git a/dom/media/doctor/DDLogObject.h b/dom/media/doctor/DDLogObject.h
new file mode 100644
index 0000000000..d16d601eb2
--- /dev/null
+++ b/dom/media/doctor/DDLogObject.h
@@ -0,0 +1,62 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* 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 DDLogObject_h_
+#define DDLogObject_h_
+
+#include "nsString.h"
+
+namespace mozilla {
+
+// DDLogObject identifies a C++ object by its pointer and its class name (as
+// provided in a DDLoggedTypeTrait.)
+// Note that a DDLogObject could have the exact same pointer&type as a previous
+// one, so extra information is needed to distinguish them, see DDLifetime.
+class DDLogObject {
+ public:
+  // Default-initialization with null pointer.
+  DDLogObject() : mTypeName("<unset>"), mPointer(nullptr) {}
+
+  // Construction with given non-null type name and pointer.
+  DDLogObject(const char* aTypeName, const void* aPointer)
+      : mTypeName(aTypeName), mPointer(aPointer) {
+    MOZ_ASSERT(aTypeName);
+    MOZ_ASSERT(aPointer);
+  }
+
+  // Sets this DDLogObject to an actual object.
+  void Set(const char* aTypeName, const void* aPointer) {
+    MOZ_ASSERT(aTypeName);
+    MOZ_ASSERT(aPointer);
+    mTypeName = aTypeName;
+    mPointer = aPointer;
+  }
+
+  // Object pointer, used for identification purposes only.
+  const void* Pointer() const { return mPointer; }
+
+  // Type name. Should only be accessed after non-null pointer initialization.
+  const char* TypeName() const {
+    MOZ_ASSERT(mPointer);
+    return mTypeName;
+  }
+
+  bool operator==(const DDLogObject& a) const {
+    return mPointer == a.mPointer && (!mPointer || mTypeName == a.mTypeName);
+  }
+
+  // Print the type name and pointer, e.g.: "MediaDecoder[136078200]".
+  void AppendPrintf(nsCString& mString) const;
+  nsCString Printf() const;
+
+ private:
+  const char* mTypeName;
+  const void* mPointer;
+};
+
+}  // namespace mozilla
+
+#endif  // DDLogObject_h_