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;;; Guile VM frame functions
;;; Copyright (C) 2001 Free Software Foundation, Inc.
;;; Copyright (C) 2005 Ludovic Court�s <ludovic.courtes@laas.fr>
;;;
;;; 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 St, Fifth Floor, Boston, MA 02110-1301 USA
;;; Code:
(define-module (system vm frame)
:use-module ((system vm core) :renamer (symbol-prefix-proc 'vm:))
:export (frame-number frame-address
vm-current-frame-chain vm-last-frame-chain
print-frame print-frame-call))
;;;
;;; Frame chain
;;;
(define frame-number (make-object-property))
(define frame-address (make-object-property))
(define (vm-current-frame-chain vm)
(make-frame-chain (vm:vm-this-frame vm) (vm:vm:ip vm)))
(define (vm-last-frame-chain vm)
(make-frame-chain (vm:vm-last-frame vm) (vm:vm:ip vm)))
(define (make-frame-chain frame addr)
(let* ((link (vm:frame-dynamic-link frame))
(chain (if (eq? link #t)
'()
(cons frame (make-frame-chain
link (vm:frame-return-address frame))))))
(set! (frame-number frame) (length chain))
(set! (frame-address frame)
(- addr (program-base (vm:frame-program frame))))
chain))
;;;
;;; Pretty printing
;;;
(define (print-frame frame)
(format #t "#~A " (vm:frame-number frame))
(print-frame-call frame)
(newline))
(define (print-frame-call frame)
(define (abbrev x)
(cond ((list? x) (if (> (length x) 3)
(list (abbrev (car x)) (abbrev (cadr x)) '...)
(map abbrev x)))
((pair? x) (cons (abbrev (car x)) (abbrev (cdr x))))
((vector? x) (case (vector-length x)
((0) x)
((1) (vector (abbrev (vector-ref x 0))))
(else (vector (abbrev (vector-ref x 0)) '...))))
(else x)))
(write (abbrev (cons (program-name frame)
(vm:frame-arguments frame)))))
(define (program-name frame)
(let ((prog (vm:frame-program frame))
(link (vm:frame-dynamic-link frame)))
(or (object-property prog 'name)
(vm:frame-object-name link (1- (vm:frame-address link)) prog)
(hash-fold (lambda (s v d) (if (eq? prog (variable-ref v)) s d))
prog (module-obarray (current-module))))))
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