1 files changed, 82 insertions, 0 deletions
diff --git a/Backends/CairoBackend/src/CairoDebug.cs b/Backends/CairoBackend/src/CairoDebug.cs
new file mode 100644
index 00000000..890793da
--- /dev/null
+++ b/Backends/CairoBackend/src/CairoDebug.cs
@@ -0,0 +1,82 @@
+//
+// CairoDebug.cs
+//
+// Author:
+//   Michael Hutchinson (mhutch@xamarin.com)
+//
+// Copyright (C) 2013 Xamarin Inc. (http://www.xamarin.com)
+//
+// Permission is hereby granted, free of charge, to any person obtaining
+// a copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to
+// permit persons to whom the Software is furnished to do so, subject to
+// the following conditions:
+//
+// The above copyright notice and this permission notice shall be
+// included in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+//
+
+using System;
+
+namespace Crow.Drawing {
+
+	static class CairoDebug
+	{
+		static System.Collections.Generic.Dictionary<IntPtr,string> traces;
+
+		public static readonly bool Enabled;
+
+		static CairoDebug ()
+		{
+			var dbg = Environment.GetEnvironmentVariable ("MONO_CAIRO_DEBUG_DISPOSE");
+			if (dbg == null)
+				return;
+			Enabled = true;
+			traces = new System.Collections.Generic.Dictionary<IntPtr,string> ();
+		}
+
+		public static void OnAllocated (IntPtr obj)
+		{
+			if (!Enabled)
+				throw new InvalidOperationException ();
+
+			traces[obj] = Environment.StackTrace;
+		}
+
+		public static void OnDisposed<T> (IntPtr obj, bool disposing)
+		{
+			if (disposing && !Enabled)
+				throw new InvalidOperationException ();
+
+			if (Environment.HasShutdownStarted)
+				return;
+
+			if (!disposing) {
+				System.Diagnostics.Debug.WriteLine ("{0} is leaking, programmer is missing a call to Dispose", typeof(T).FullName);
+				if (Enabled) {
+					string val;
+					if (traces.TryGetValue (obj, out val)) {
+						System.Diagnostics.Debug.WriteLine ("Allocated from:");
+						System.Diagnostics.Debug.WriteLine (val);
+					}
+				} else {
+					System.Diagnostics.Debug.WriteLine ("Set MONO_CAIRO_DEBUG_DISPOSE to track allocation traces");
+				}
+			}
+
+			if (Enabled)
+				traces.Remove (obj);
+		}
+	}
+
+}