add loop counter v1

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>

src/muz_qe/dl_mk_loop_counter.h

@@ -0,0 +1,38 @@
+/*++
+Copyright (c) 2013 Microsoft Corporation
+
+Module Name:
+
+    dl_mk_loop_counter.h
+
+Abstract:
+
+    Add loop counter argument to relations.
+
+Author:
+
+    Nikolaj Bjorner (nbjorner) 2013-03-31
+
+Revision History:
+
+--*/
+#ifndef _DL_MK_LOOP_COUNTER_H_
+#define _DL_MK_LOOP_COUNTER_H_
+
+#include"dl_rule_transformer.h"
+
+namespace datalog {
+
+    class mk_loop_counter : public rule_transformer::plugin {
+        app_ref add_arg(ast_manager& m, app* fn, unsigned idx);        
+    public:
+        mk_loop_counter(context & ctx, unsigned priority = 33000);
+        ~mk_loop_counter();
+        
+        rule_set * operator()(rule_set const & source);
+    };
+
+};
+
+#endif /* _DL_MK_LOOP_COUNTER_H_ */
+