--- /dev/null
+;;;; (ice-9 debugger trc) -- tracing for Guile debugger code
+
+;;; Copyright (C) 2002, 2006 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 2.1 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
+
+(define-module (ice-9 debugger trc)
+ #:export (trc trc-syms trc-all trc-none trc-add trc-remove trc-port))
+
+(define *syms* #f)
+
+(define (trc-set! syms)
+ (set! *syms* syms))
+
+(define (trc-syms . syms)
+ (trc-set! syms))
+
+(define (trc-all)
+ (trc-set! #f))
+
+(define (trc-none)
+ (trc-set! '()))
+
+(define (trc-add sym)
+ (trc-set! (cons sym *syms*)))
+
+(define (trc-remove sym)
+ (trc-set! (delq1! sym *syms*)))
+
+(define (trc sym . args)
+ (if (or (not *syms*)
+ (memq sym *syms*))
+ (let ((port (trc-port)))
+ (write sym port)
+ (display ":" port)
+ (for-each (lambda (arg)
+ (display " " port)
+ (write arg port))
+ args)
+ (newline port))))
+
+(define trc-port
+ (let ((port (current-error-port)))
+ (make-procedure-with-setter
+ (lambda () port)
+ (lambda (p) (set! port p)))))
+
+;; Default to no tracing.
+(trc-none)
+
+;;; (ice-9 debugger trc) ends here.