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diff --git a/src/arch/instructions/undefined.h b/src/arch/instructions/undefined.h
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+
+/* Chrysalide - Outil d'analyse de fichiers binaires
+ * undefined.h - prototypes pour les instructions au comportement non défini
+ *
+ * Copyright (C) 2016-2019 Cyrille Bagard
+ *
+ *  This file is part of Chrysalide.
+ *
+ *  Chrysalide 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 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  Chrysalide 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 Chrysalide.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+
+#ifndef _ARCH_INSTRUCTIONS_UNDEFINED_H
+#define _ARCH_INSTRUCTIONS_UNDEFINED_H
+
+
+#include <glib-object.h>
+
+
+#include "../instruction.h"
+#include "../vmpa.h"
+
+
+
+#define G_TYPE_UNDEF_INSTRUCTION            g_undef_instruction_get_type()
+#define G_UNDEF_INSTRUCTION(obj)            (G_TYPE_CHECK_INSTANCE_CAST((obj), G_TYPE_UNDEF_INSTRUCTION, GUndefInstruction))
+#define G_IS_UNDEF_INSTRUCTION(obj)         (G_TYPE_CHECK_INSTANCE_TYPE((obj), G_TYPE_UNDEF_INSTRUCTION))
+#define G_UNDEF_INSTRUCTION_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST((klass), G_TYPE_UNDEF_INSTRUCTION, GUndefInstructionClass))
+#define G_IS_UNDEF_INSTRUCTION_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass), G_TYPE_UNDEF_INSTRUCTION))
+#define G_UNDEF_INSTRUCTION_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS((obj), G_TYPE_UNDEF_INSTRUCTION, GUndefInstructionClass))
+
+
+/* Définition générique d'une instruction au comportement non défini (instance) */
+typedef struct _GUndefInstruction GUndefInstruction;
+
+/* Définition générique d'une instruction au comportement non défini (classe) */
+typedef struct _GUndefInstructionClass GUndefInstructionClass;
+
+
+/* Etat précis de l'instruction */
+typedef enum _InstrExpectedBehavior
+{
+    IEB_NOP,
+    IEB_UNDEFINED,
+    IEB_UNPREDICTABLE,
+
+} InstrExpectedBehavior;
+
+
+/* Indique le type défini pour une instruction au comportement non défini. */
+GType g_undef_instruction_get_type(void);
+
+/* Crée une instruction au comportement nominalement indéfini. */
+GArchInstruction *g_undef_instruction_new(InstrExpectedBehavior);
+
+/* Indique le type de conséquences réél de l'instruction. */
+InstrExpectedBehavior g_undef_instruction_get_behavior(const GUndefInstruction *);
+
+
+
+#endif  /* _ARCH_INSTRUCTIONS_UNDEFINED_H */