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;;;; Guile Debugger
;;; Copyright (C) 1999, 2001, 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 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
(define-module (ice-9 debugger)
#:use-module (ice-9 debugger command-loop)
#:use-module (ice-9 debugger state)
#:use-module (ice-9 debugger utils)
#:use-module (ice-9 debugging traps)
#:use-module (ice-9 format)
#:export (debug-stack
debug
debug-last-error
debugger-error
debugger-quit
debugger-input-port
debugger-output-port
debug-on-error)
#:no-backtrace)
;;; The old (ice-9 debugger) has been factored into its constituent
;;; parts:
;;;
;;; (ice-9 debugger) - public interface to all of the following
;;;
;;; (... commands) - procedures implementing the guts of the commands
;;; provided by the interactive debugger
;;;
;;; (... command-loop) - binding these commands into the interactive
;;; debugger command loop
;;;
;;; (... state) - implementation of an object that tracks current
;;; debugger state
;;;
;;; (... utils) - utilities for printing out frame and stack
;;; information in various formats
;;;
;;; The division between (... commands) and (... command-loop) exists
;;; because I (NJ) have another generic command loop implementation
;;; under development, and I want to be able to switch easily between
;;; that and the command loop implementation here. Thus the
;;; procedures in this file delegate to a debugger command loop
;;; implementation via the `debugger-command-loop-*' interface. The
;;; (ice-9 debugger command-loop) implementation can be replaced by
;;; any other that implements the `debugger-command-loop-*' interface
;;; simply by changing the relevant #:use-module line above.
;;;
;;; - Neil Jerram <neil@ossau.uklinux.net> 2002-10-26, updated 2005-07-09
(define *not-yet-introduced* #t)
(define (debug-stack stack . flags)
"Invoke the Guile debugger to explore the specified @var{stack}.
@var{flags}, if present, are keywords indicating characteristics of
the debugging session: the valid keywords are as follows.
@table @code
@item #:continuable
Indicates that the debugger is being invoked from a context (such as
an evaluator trap handler) where it is possible to return from the
debugger and continue normal code execution. This enables the
@dfn{continuing execution} commands, for example @code{continue} and
@code{step}.
@item #:with-introduction
Indicates that the debugger should display an introductory message.
@end table"
(start-stack 'debugger
(let ((state (apply make-state stack 0 flags)))
(with-input-from-port (debugger-input-port)
(lambda ()
(with-output-to-port (debugger-output-port)
(lambda ()
(if (or *not-yet-introduced*
(memq #:with-introduction flags))
(let ((ssize (stack-length stack)))
(display "This is the Guile debugger -- for help, type `help'.\n")
(set! *not-yet-introduced* #f)
(if (= ssize 1)
(display "There is 1 frame on the stack.\n\n")
(format #t "There are ~A frames on the stack.\n\n" ssize))))
(write-state-short state)
(debugger-command-loop state))))))))
(define (debug)
"Invoke the Guile debugger to explore the context of the last error."
(let ((stack (fluid-ref the-last-stack)))
(if stack
(debug-stack stack)
(display "Nothing to debug.\n"))))
(define debug-last-error debug)
(define (debugger-error message)
"Signal a debugger usage error with message @var{message}."
(debugger-command-loop-error message))
(define (debugger-quit)
"Exit the debugger."
(debugger-command-loop-quit))
;;; {Debugger Input and Output Ports}
(define debugger-input-port
(let ((input-port (current-input-port)))
(make-procedure-with-setter
(lambda () input-port)
(lambda (port) (set! input-port port)))))
(define debugger-output-port
(let ((output-port (current-output-port)))
(make-procedure-with-setter
(lambda () output-port)
(lambda (port) (set! output-port port)))))
;;; {Debug on Error}
(define (debug-on-error syms)
"Enable or disable debug on error."
(set! pre-unwind-handler-dispatch
(if syms
(lambda (key . args)
(if (memq key syms)
(begin
(debug-stack (make-stack #t pre-unwind-handler-dispatch)
#:with-introduction
#:continuable)
(throw 'abort key)))
(apply default-pre-unwind-handler key args))
default-pre-unwind-handler)))
;;; Also provide a `debug-trap' entry point. This maps from a
;;; trap-context to a debug-stack call.
(define-public (debug-trap trap-context)
"Invoke the Guile debugger to explore the stack at the specified @var{trap-context}."
(let* ((stack (tc:stack trap-context))
(flags1 (let ((trap-type (tc:type trap-context)))
(case trap-type
((#:return #:error)
(list trap-type
(tc:return-value trap-context)))
(else
(list trap-type)))))
(flags (if (tc:continuation trap-context)
(cons #:continuable flags1)
flags1)))
(apply debug-stack stack flags)))
;;; (ice-9 debugger) ends here.
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