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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))))