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[bpt/guile.git] / ice-9 / debugger / state.scm

;;;; (ice-9 debugger state) -- debugger state representation

;;; Copyright (C) 2002 Free Software Foundation, Inc.
;;;
;;; This program is free software; you can redistribute it and/or
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;;; General Public License for more details.
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;;; to produce an executable, this does not by itself cause the
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(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.