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73 lines
2.5 KiB
Scheme
73 lines
2.5 KiB
Scheme
;;; Guile VM tracer
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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 trace)
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:use-syntax (system base syntax)
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:use-module (system vm core)
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:use-module (ice-9 format)
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:export (vm-trace vm-trace-on vm-trace-off))
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(define (vm-trace vm objcode . opts)
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(dynamic-wind
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(lambda () (apply vm-trace-on vm opts))
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(lambda () (vm (objcode->program objcode)))
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(lambda () (apply vm-trace-off vm opts))))
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(define (vm-trace-on vm . opts)
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(set-vm-option! vm 'trace-first #t)
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(if (memq :b opts) (add-hook! (vm-next-hook vm) trace-next))
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(set-vm-option! vm 'trace-options opts)
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(add-hook! (vm-apply-hook vm) trace-apply)
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(add-hook! (vm-return-hook vm) trace-return))
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(define (vm-trace-off vm . opts)
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(if (memq :b opts) (remove-hook! (vm-next-hook vm) trace-next))
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(remove-hook! (vm-apply-hook vm) trace-apply)
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(remove-hook! (vm-return-hook vm) trace-return))
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(define (trace-next vm)
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(let ((frame (vm-current-frame vm)))
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(format #t "0x~8X ~20S" (vm:ip vm) (vm-fetch-code vm))
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(do ((opts (vm-option vm 'trace-options) (cdr opts)))
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((null? opts) (newline))
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(case (car opts)
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((:s) (format #t "~20S" (vm-fetch-stack vm)))
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((:v) (format #t "~20S" (frame-variables frame)))
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((:e) (format #t "~20A" (object->string (frame-external-link frame))))))))
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(define (trace-apply vm)
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(if (vm-option vm 'trace-first)
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(set-vm-option! vm 'trace-first #f) ;; skip the initial program
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(let ((frame (vm-current-frame vm)))
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(print-prefix (frame-dynamic-link frame))
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(write (frame->call frame))
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(newline))))
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(define (trace-return vm)
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(let ((frame (vm-current-frame vm)))
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(print-prefix (frame-dynamic-link frame))
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(write (car (vm-fetch-stack vm)))
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(newline)))
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(define (print-prefix frame)
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(and-let* ((link (frame-dynamic-link frame)))
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(display "| ")
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(print-prefix link)))
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