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diff --git a/mixguile/mixguile-vm-stat.scm b/mixguile/mixguile-vm-stat.scm
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+;; -*-scheme-*- -------------- mixguile-vm-stat.scm :
+;  mixvm status functions
+;  ------------------------------------------------------------------
+;   $Id: mixguile-vm-stat.scm,v 1.4 2005/09/20 19:43:14 jao Exp $
+;  ------------------------------------------------------------------
+;  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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+;   
+;;
+
+;; possible status index
+(define mix-status-values (vector 'MIX_ERROR
+				  'MIX_BREAK
+				  'MIX_COND_BREAK
+				  'MIX_HALTED
+				  'MIX_RUNNING
+				  'MIX_LOADED
+				  'MIX_EMPTY))
+;; return status as a simbol
+(define mix-vm-status (lambda () (vector-ref mix-status-values (mixvm-status))))
+
+;; check for a given status
+(define mix-vm-status?
+  (lambda (status) (eq? status (mix-vm-status))))
+
+;; predicates for each possible status
+(define mix-vm-error? (lambda () (mix-vm-status? 'MIX_ERROR)))
+(define mix-vm-break? (lambda () (mix-vm-status? 'MIX_BREAK)))
+(define mix-vm-cond-break? (lambda () (mix-vm-status? 'MIX_COND_BREAK)))
+(define mix-vm-halted? (lambda () (mix-vm-status? 'MIX_HALTED)))
+(define mix-vm-running? (lambda () (mix-vm-status? 'MIX_RUNNING)))
+(define mix-vm-loaded? (lambda () (mix-vm-status? 'MIX_LOADED)))
+(define mix-vm-empty? (lambda () (mix-vm-status? 'MIX_EMPTY)))
+
+
+;; define hooks on break conditions
+
+(define mix-make-conditional-hook
+  (lambda (test hook)
+    (lambda (arglist)
+      (if (test) (hook (mix-src-line-no) (mix-loc))))))
+
+(define mix-add-run-next-hook
+  (lambda (hook)
+    (mix-add-post-hook 'run hook)
+    (mix-add-post-hook 'next hook)))
+    
+
+(define mix-add-break-hook
+  (lambda (hook)
+    (mix-add-run-next-hook (mix-make-conditional-hook mix-vm-break? hook))))
+
+(define mix-add-cond-break-hook
+  (lambda (hook)
+    (mix-add-run-next-hook (mix-make-conditional-hook
+			    mix-vm-cond-break? hook))))
+
+