| 1 | ;;;; (ice-9 debugger state) -- debugger state representation |
| 2 | |
| 3 | ;;; Copyright (C) 2002, 2006 Free Software Foundation, Inc. |
| 4 | ;;; |
| 5 | ;; This library is free software; you can redistribute it and/or |
| 6 | ;; modify it under the terms of the GNU Lesser General Public |
| 7 | ;; License as published by the Free Software Foundation; either |
| 8 | ;; version 2.1 of the License, or (at your option) any later version. |
| 9 | ;; |
| 10 | ;; This library is distributed in the hope that it will be useful, |
| 11 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | ;; Lesser General Public License for more details. |
| 14 | ;; |
| 15 | ;; You should have received a copy of the GNU Lesser General Public |
| 16 | ;; License along with this library; if not, write to the Free Software |
| 17 | ;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 18 | |
| 19 | (define-module (ice-9 debugger state) |
| 20 | #:export (make-state |
| 21 | state-stack |
| 22 | state-index |
| 23 | state-flags |
| 24 | set-stack-index!)) |
| 25 | |
| 26 | (define state-rtd (make-record-type "debugger-state" '(stack index flags))) |
| 27 | (define state? (record-predicate state-rtd)) |
| 28 | (define make-state |
| 29 | (let ((make-state-internal (record-constructor state-rtd |
| 30 | '(stack index flags)))) |
| 31 | (lambda (stack index . flags) |
| 32 | (make-state-internal stack index flags)))) |
| 33 | (define state-stack (record-accessor state-rtd 'stack)) |
| 34 | (define state-index (record-accessor state-rtd 'index)) |
| 35 | (define state-flags (record-accessor state-rtd 'flags)) |
| 36 | |
| 37 | (define set-state-index! (record-modifier state-rtd 'index)) |
| 38 | |
| 39 | (define (set-stack-index! state index) |
| 40 | (let* ((stack (state-stack state)) |
| 41 | (ssize (stack-length stack))) |
| 42 | (set-state-index! state |
| 43 | (cond ((< index 0) 0) |
| 44 | ((>= index ssize) (- ssize 1)) |
| 45 | (else index))))) |
| 46 | |
| 47 | ;;; (ice-9 debugger state) ends here. |