1;;; -*- mode: scheme; coding: utf-8; -*- 2 3;;;; Copyright (C) 1995,1996,1997,1998,1999,2000,2001,2002,2003,2004,2005,2006,2007,2008,2009,2010,2014 4;;;; Free Software Foundation, Inc. 5;;;; 6;;;; This library is free software; you can redistribute it and/or 7;;;; modify it under the terms of the GNU Lesser General Public 8;;;; License as published by the Free Software Foundation; either 9;;;; version 3 of the License, or (at your option) any later version. 10;;;; 11;;;; This library is distributed in the hope that it will be useful, 12;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of 13;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14;;;; Lesser General Public License for more details. 15;;;; 16;;;; You should have received a copy of the GNU Lesser General Public 17;;;; License along with this library; if not, write to the Free Software 18;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 19;;;; 20 21 22 23;;; Commentary: 24 25;;; An older approack to debugging, in which the user installs a pre-unwind 26;;; handler that saves the stack at the time of the error. The last stack can 27;;; then be debugged later. 28;;; 29 30;;; Code: 31 32(define-module (ice-9 save-stack) 33 ;; Replace deprecated root-module bindings, if present. 34 #:export (stack-saved? 35 the-last-stack 36 save-stack)) 37 38;; FIXME: stack-saved? is broken in the presence of threads. 39(define stack-saved? #f) 40 41(define the-last-stack (make-fluid)) 42 43(define (save-stack . narrowing) 44 (if (not stack-saved?) 45 (begin 46 (let ((stacks (fluid-ref %stacks))) 47 (fluid-set! the-last-stack 48 ;; (make-stack obj inner outer inner outer ...) 49 ;; 50 ;; In this case, cut away the make-stack frame, the 51 ;; save-stack frame, and then narrow as specified by the 52 ;; user, delimited by the nearest start-stack invocation, 53 ;; if any. 54 (apply make-stack #t 55 2 56 (if (pair? stacks) (cdr stacks) 0) 57 narrowing))) 58 (set! stack-saved? #t)))) 59