| ;;; -*- mode: scheme; coding: utf-8; -*- | |
| ;;;; Copyright (C) 1995,1996,1997,1998,1999,2000,2001,2002,2003,2004,2005,2006,2007,2008,2009,2010,2014 | |
| ;;;; Free Software Foundation, Inc. | |
| ;;;; | |
| ;;;; This library is free software; you can redistribute it and/or | |
| ;;;; modify it under the terms of the GNU Lesser General Public | |
| ;;;; License as published by the Free Software Foundation; either | |
| ;;;; version 3 of the License, or (at your option) any later version. | |
| ;;;; | |
| ;;;; This library 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 | |
| ;;;; Lesser General Public License for more details. | |
| ;;;; | |
| ;;;; You should have received a copy of the GNU Lesser General Public | |
| ;;;; License along with this library; if not, write to the Free Software | |
| ;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
| ;;;; | |
| ;;; Commentary: | |
| ;;; An older approack to debugging, in which the user installs a pre-unwind | |
| ;;; handler that saves the stack at the time of the error. The last stack can | |
| ;;; then be debugged later. | |
| ;;; | |
| ;;; Code: | |
| (define-module (ice-9 save-stack) | |
| ;; Replace deprecated root-module bindings, if present. | |
| #:export (stack-saved? | |
| the-last-stack | |
| save-stack)) | |
| ;; FIXME: stack-saved? is broken in the presence of threads. | |
| (define stack-saved? #f) | |
| (define the-last-stack (make-fluid)) | |
| (define (save-stack . narrowing) | |
| (if (not stack-saved?) | |
| (begin | |
| (let ((stacks (fluid-ref %stacks))) | |
| (fluid-set! the-last-stack | |
| ;; (make-stack obj inner outer inner outer ...) | |
| ;; | |
| ;; In this case, cut away the make-stack frame, the | |
| ;; save-stack frame, and then narrow as specified by the | |
| ;; user, delimited by the nearest start-stack invocation, | |
| ;; if any. | |
| (apply make-stack #t | |
| 2 | |
| (if (pair? stacks) (cdr stacks) 0) | |
| narrowing))) | |
| (set! stack-saved? #t)))) | |