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47 lines
1.8 KiB
Scheme
47 lines
1.8 KiB
Scheme
;;;; (ice-9 debugger state) -- debugger state representation
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;;; Copyright (C) 2002 Free Software Foundation, Inc.
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;;;
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;; This library is free software; you can redistribute it and/or
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;; modify it under the terms of the GNU Lesser General Public
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;; License as published by the Free Software Foundation; either
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;; version 2.1 of the License, or (at your option) any later version.
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;;
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;; This library is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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;; Lesser General Public License for more details.
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;;
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;; You should have received a copy of the GNU Lesser General Public
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;; License along with this library; if not, write to the Free Software
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;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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(define-module (ice-9 debugger state)
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#:export (make-state
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state-stack
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state-index
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state-flags
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set-stack-index!))
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(define state-rtd (make-record-type "debugger-state" '(stack index flags)))
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(define state? (record-predicate state-rtd))
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(define make-state
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(let ((make-state-internal (record-constructor state-rtd
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'(stack index flags))))
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(lambda (stack index . flags)
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(make-state-internal stack index flags))))
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(define state-stack (record-accessor state-rtd 'stack))
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(define state-index (record-accessor state-rtd 'index))
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(define state-flags (record-accessor state-rtd 'flags))
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(define set-state-index! (record-modifier state-rtd 'index))
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(define (set-stack-index! state index)
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(let* ((stack (state-stack state))
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(ssize (stack-length stack)))
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(set-state-index! state
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(cond ((< index 0) 0)
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((>= index ssize) (- ssize 1))
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(else index)))))
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;;; (ice-9 debugger state) ends here.
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