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;;; Guile VM tracer
;; Copyright (C) 2001 Free Software Foundation, Inc.
;; 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, 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; see the file COPYING. If not, write to
;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
;;; Code:
(define-module (system vm trace)
#:use-syntax (system base syntax)
#:use-module (system vm vm)
#:use-module (system vm frame)
#:use-module (ice-9 format)
#:export (vm-trace vm-trace-on vm-trace-off))
(define (vm-trace vm objcode . opts)
(dynamic-wind
(lambda () (apply vm-trace-on vm opts))
(lambda () (vm-load vm objcode))
(lambda () (apply vm-trace-off vm opts))))
(define (vm-trace-on vm . opts)
(set-vm-option! vm 'trace-first #t)
(if (memq #:b opts) (add-hook! (vm-next-hook vm) trace-next))
(set-vm-option! vm 'trace-options opts)
(add-hook! (vm-apply-hook vm) trace-apply)
(add-hook! (vm-return-hook vm) trace-return))
(define (vm-trace-off vm . opts)
(if (memq #:b opts) (remove-hook! (vm-next-hook vm) trace-next))
(remove-hook! (vm-apply-hook vm) trace-apply)
(remove-hook! (vm-return-hook vm) trace-return))
(define (trace-next vm)
(define (puts x) (display #\tab) (write x))
(define (truncate! x n)
(if (> (length x) n)
(list-cdr-set! x (1- n) '(...))) x)
;; main
(format #t "0x~8X ~16S" (vm:ip vm) (vm-fetch-code vm))
(do ((opts (vm-option vm 'trace-options) (cdr opts)))
((null? opts) (newline))
(case (car opts)
((:s) (puts (truncate! (vm-fetch-stack vm) 3)))
((:l) (puts (vm-fetch-locals vm)))
((:e) (puts (vm-fetch-externals vm))))))
(define (trace-apply vm)
(if (vm-option vm 'trace-first)
(set-vm-option! vm 'trace-first #f)
(let ((chain (vm-current-frame-chain vm)))
(print-indent chain)
(print-frame-call (car chain))
(newline))))
(define (trace-return vm)
(let ((chain (vm-current-frame-chain vm)))
(print-indent chain)
(write (vm-return-value vm))
(newline)))
(define (print-indent chain)
(cond ((pair? (cdr chain))
(display "| ")
(print-indent (cdr chain)))))
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