add misc/debugerror.h

misc/debugerror.h

@@ -0,0 +1,80 @@
+/**
+ * @file debugerror.h
+ * @author Ambroz Bizjak <ambrop7@gmail.com>
+ * 
+ * @section LICENSE
+ * 
+ * This file is part of BadVPN.
+ * 
+ * BadVPN is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ * 
+ * BadVPN 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 this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * 
+ * @section DESCRIPTION
+ * 
+ * Mechanism for ensuring an object is destroyed from inside an error handler.
+ */
+
+#ifndef BADVPN_MISC_DEBUGERROR_H
+#define BADVPN_MISC_DEBUGERROR_H
+
+#include <misc/dead.h>
+#include <misc/debug.h>
+
+#ifndef NDEBUG
+    #define DEBUGERROR(de, call) \
+        { \
+            ASSERT(!(de)->error) \
+            (de)->error = 1; \
+            DEAD_ENTER((de)->dead) \
+            (call); \
+            ASSERT(DEAD_KILLED) \
+            DEAD_LEAVE((de)->dead); \
+        }
+#else
+    #define DEBUGERROR(de, call) { (call); }
+#endif
+
+typedef struct {
+    #ifndef NDEBUG
+    dead_t dead;
+    int error;
+    #endif
+} DebugError;
+
+static void DebugError_Init (DebugError *o);
+static void DebugError_Free (DebugError *o);
+static void DebugError_AssertNoError (DebugError *o);
+
+void DebugError_Init (DebugError *o)
+{
+    #ifndef NDEBUG
+    DEAD_INIT(o->dead);
+    o->error = 0;
+    #endif
+}
+
+void DebugError_Free (DebugError *o)
+{
+    #ifndef NDEBUG
+    DEAD_KILL(o->dead);
+    #endif
+}
+
+void DebugError_AssertNoError (DebugError *o)
+{
+    #ifndef NDEBUG
+    ASSERT(!o->error)
+    #endif
+}
+
+#endif