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;;;; (ice-9 debugger state) -- debugger state representation
;;; Copyright (C) 2002, 2006 Free Software Foundation, Inc.
;;;
;;;; This library is free software; you can redistribute it and/or
;;;; modify it under the terms of the GNU Lesser General Public
;;;; License as published by the Free Software Foundation; either
;;;; version 3 of the License, or (at your option) any later version.
;;;;
;;;; This library 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
;;;; Lesser General Public License for more details.
;;;;
;;;; You should have received a copy of the GNU Lesser General Public
;;;; License along with this library; if not, write to the Free Software
;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
(define-module (ice-9 debugger state)
#:export (make-state
state-stack
state-index
state-flags
set-stack-index!))
(define state-rtd (make-record-type "debugger-state" '(stack index flags)))
(define state? (record-predicate state-rtd))
(define make-state
(let ((make-state-internal (record-constructor state-rtd
'(stack index flags))))
(lambda (stack index . flags)
(make-state-internal stack index flags))))
(define state-stack (record-accessor state-rtd 'stack))
(define state-index (record-accessor state-rtd 'index))
(define state-flags (record-accessor state-rtd 'flags))
(define set-state-index! (record-modifier state-rtd 'index))
(define (set-stack-index! state index)
(let* ((stack (state-stack state))
(ssize (stack-length stack)))
(set-state-index! state
(cond ((< index 0) 0)
((>= index ssize) (- ssize 1))
(else index)))))
;;; (ice-9 debugger state) ends here.
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