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78 lines
2.4 KiB
Scheme
78 lines
2.4 KiB
Scheme
;;; Guile VM frame functions
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;; Copyright (C) 2001 Free Software Foundation, Inc.
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;; This program is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2, or (at your option)
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;; any later version.
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;;
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;; This program 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
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;; GNU General Public License for more details.
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;;
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;; You should have received a copy of the GNU General Public License
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;; along with this program; see the file COPYING. If not, write to
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;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;;; Code:
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(define-module (system vm frame)
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:use-module (system vm core))
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;;;
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;;; Frame chain
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;;;
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(define-public frame-number (make-object-property))
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(define-public frame-address (make-object-property))
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(define-public (vm-current-frame-chain vm)
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(make-frame-chain (vm-this-frame vm) (vm:ip vm)))
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(define-public (vm-last-frame-chain vm)
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(make-frame-chain (vm-last-frame vm) (vm:ip vm)))
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(define (make-frame-chain frame addr)
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(let* ((link (frame-dynamic-link frame))
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(chain (if (eq? link #t)
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'()
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(cons frame (make-frame-chain
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link (frame-return-address frame))))))
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(set! (frame-number frame) (length chain))
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(set! (frame-address frame) (- addr (program-base (frame-program frame))))
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chain))
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;;;
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;;; Pretty printing
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;;;
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(define-public (print-frame frame)
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(format #t "#~A " (frame-number frame))
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(print-frame-call frame)
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(newline))
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(define-public (print-frame-call frame)
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(define (abbrev x)
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(cond ((list? x) (if (> (length x) 3)
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(list (abbrev (car x)) (abbrev (cadr x)) '...)
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(map abbrev x)))
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((pair? x) (cons (abbrev (car x)) (abbrev (cdr x))))
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((vector? x) (case (vector-length x)
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((0) x)
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((1) (vector (abbrev (vector-ref x 0))))
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(else (vector (abbrev (vector-ref x 0)) '...))))
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(else x)))
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(write (abbrev (cons (program-name frame) (frame-arguments frame)))))
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(define (program-name frame)
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(let ((prog (frame-program frame))
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(link (frame-dynamic-link frame)))
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(or (object-property prog 'name)
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(frame-object-name link (1- (frame-address link)) prog)
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(hash-fold (lambda (s v d) (if (eq? prog (variable-ref v)) s d))
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prog (module-obarray (current-module))))))
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