--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/debug.h	Mon Aug 13 08:45:50 2007 +0200
@@ -0,0 +1,81 @@
+/* Debugging aids -- togglable assertions.
+   Copyright (C) 1994 Free Software Foundation, Inc.
+
+This file is part of XEmacs.
+
+XEmacs is free software; you can redistribute it and/or modify it
+under the terms of the GNU General Public License as published by the
+Free Software Foundation; either version 2, or (at your option) any
+later version.
+
+XEmacs is distributed in the hope that it will be useful, but WITHOUT
+ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with XEmacs; see the file COPYING.  If not, write to
+the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+
+/* Synched up with: Not in FSF. */
+
+/* Written by Chuck Thompson */
+
+#ifndef _XEMACS_DEBUG_H_
+#define _XEMACS_DEBUG_H_
+
+#define DEBUG_STDERR	1
+#define DEBUG_ABORT	2
+
+#ifdef DEBUG_XEMACS
+
+#include <stdio.h>
+
+struct debug_classes
+{
+  unsigned int redisplay :1;
+  unsigned int buffers :1;
+  unsigned int extents :1;
+  unsigned int faces :1;
+  unsigned int windows :1;
+  unsigned int frames :1;
+  unsigned int devices :1;
+  unsigned int byte_code :1;
+
+  unsigned int types_of_redisplay;
+  unsigned int types_of_buffers;
+  unsigned int types_of_extents;
+  unsigned int types_of_faces;
+  unsigned int types_of_windows;
+  unsigned int types_of_frames;
+  unsigned int types_of_devices;
+  unsigned int types_of_byte_code;
+};
+
+extern Lisp_Object Qredisplay, Qbuffers, Qextents, Qfaces;
+extern Lisp_Object Qwindows, Qframes, Qdevices, Qbyte_code;
+extern struct debug_classes active_debug_classes;
+
+#define DASSERT(class, desired_type, action, assertion) do		\
+{									\
+  if (active_debug_classes.##class					\
+      && (active_debug_classes.types_of_##class & desired_type))	\
+    {									\
+      if (! (assertion))						\
+	{								\
+	  if (action == DEBUG_STDERR)					\
+	    stderr_out ("Assertion failed in %s at line %d\n",		\
+			__FILE__, __LINE__);		       		\
+	  else								\
+	    abort ();							\
+	}								\
+    }									\
+} while (0)
+#else /* !DEBUG_XEMACS */
+
+#define DASSERT(class, desired_type, action, assertion)	((void) 0)
+
+#endif /* !DEBUG_XEMACS */
+
+#endif /* _XEMACS_DEBUG_H_ */