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diff --git a/mixlib/mix_predicate.h b/mixlib/mix_predicate.h
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+/* -*-c-*- ---------------- mix_predicate.h :
+ * Predicates and lists of predicates testing vm status.
+ * ------------------------------------------------------------------
+ *  Last change: Time-stamp: <2001-07-13 22:32:42 jao>
+ * ------------------------------------------------------------------
+ * Copyright (C) 2001 Free Software Foundation, Inc.
+ *  
+ * This program 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 of the License, or
+ * (at your option) any later version.
+ *  
+ * This program 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *  
+ */
+
+
+#ifndef MIX_PREDICATE_H
+#define MIX_PREDICATE_H
+
+#include "mix.h"
+#include "mix_types.h"
+#include "mix_ins.h"
+
+/* the predicate type */
+typedef struct mix_predicate_t mix_predicate_t;
+
+/* predicate types */
+typedef enum {
+  MIX_PRED_REG_A,
+  MIX_PRED_REG_X,
+  MIX_PRED_REG_J,
+  MIX_PRED_REG_I1,
+  MIX_PRED_REG_I2,
+  MIX_PRED_REG_I3,
+  MIX_PRED_REG_I4,
+  MIX_PRED_REG_I5,
+  MIX_PRED_REG_I6,
+  MIX_PRED_OVER,
+  MIX_PRED_CMP,
+  MIX_PRED_MEM
+} mix_predicate_type_t;
+
+/* create predicates based on vm status */
+extern mix_predicate_t *
+mix_predicate_new (mix_predicate_type_t type);
+
+/* delete a predicate */
+extern void
+mix_predicate_delete (mix_predicate_t *predicate);
+
+/* change mem address of a MIX_PRED_MEM predicate */
+extern void
+mix_predicate_set_mem_address (mix_predicate_t *predicate,
+			       mix_address_t address);
+
+/* get message about predicate evaluation */
+extern const gchar *
+mix_predicate_get_message (const mix_predicate_t *predicate);
+
+/* test a predicate */
+#include "mix_vm.h"
+
+extern gboolean
+mix_predicate_eval(mix_predicate_t *pred, const mix_vm_t *vm);
+
+#endif /* MIX_PREDICATE_H */
+