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;;; -*- 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))))
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