1 files changed, 39 insertions, 0 deletions
diff --git a/xpcom/base/nsISizeOf.h b/xpcom/base/nsISizeOf.h
new file mode 100644
index 0000000000..7d0ef4d74f
--- /dev/null
+++ b/xpcom/base/nsISizeOf.h
@@ -0,0 +1,39 @@
+/* -*- 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 nsISizeOf_h___
+#define nsISizeOf_h___
+
+#include "mozilla/MemoryReporting.h"
+#include "nsISupports.h"
+
+#define NS_ISIZEOF_IID                               \
+  {                                                  \
+    0x61d05579, 0xd7ec, 0x485c, {                    \
+      0xa4, 0x0c, 0x31, 0xc7, 0x9a, 0x5c, 0xf9, 0xf3 \
+    }                                                \
+  }
+
+class nsISizeOf : public nsISupports {
+ public:
+  NS_DECLARE_STATIC_IID_ACCESSOR(NS_ISIZEOF_IID)
+
+  /**
+   * Measures the size of the things pointed to by the object.
+   */
+  virtual size_t SizeOfExcludingThis(
+      mozilla::MallocSizeOf aMallocSizeOf) const = 0;
+
+  /**
+   * Like SizeOfExcludingThis, but also includes the size of the object itself.
+   */
+  virtual size_t SizeOfIncludingThis(
+      mozilla::MallocSizeOf aMallocSizeOf) const = 0;
+};
+
+NS_DEFINE_STATIC_IID_ACCESSOR(nsISizeOf, NS_ISIZEOF_IID)
+
+#endif /* nsISizeOf_h___ */