/usr/share/guile/3.0/ice-9
Edit: /usr/share/guile/3.0/ice-9/scm-style-repl.scm (11900B)
;;;; 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
;;;;
(define-module (ice-9 scm-style-repl)
#:use-module (ice-9 save-stack)
#:export (scm-repl-silent
scm-repl-print-unspecified
scm-repl-verbose
scm-repl-prompt
assert-repl-silence
assert-repl-print-unspecified
assert-repl-verbosity
default-pre-unwind-handler
bad-throw
error-catching-loop
error-catching-repl
scm-style-repl
handle-system-error))
(define scm-repl-silent #f)
(define (assert-repl-silence v) (set! scm-repl-silent v))
(define scm-repl-print-unspecified #f)
(define (assert-repl-print-unspecified v) (set! scm-repl-print-unspecified v))
(define scm-repl-verbose #f)
(define (assert-repl-verbosity v) (set! scm-repl-verbose v))
(define scm-repl-prompt "guile> ")
;; bad-throw is the hook that is called upon a throw to a an unhandled
;; key (unless the throw has four arguments, in which case
;; it's usually interpreted as an error throw.)
;; If the key has a default handler (a throw-handler-default property),
;; it is applied to the throw.
;;
(define (bad-throw key . args)
(let ((default (symbol-property key 'throw-handler-default)))
(or (and default (apply default key args))
(apply error "unhandled-exception:" key args))))
(define (default-pre-unwind-handler key . args)
;; Narrow by two more frames: this one, and the throw handler.
(save-stack 2)
(apply throw key args))
(define has-shown-debugger-hint? #f)
(define (error-catching-loop thunk)
(let ((status #f)
(interactive #t))
(define (loop first)
(let ((next
(catch #t
(lambda ()
(call-with-unblocked-asyncs
(lambda ()
(first)
;; This line is needed because mark
;; doesn't do closures quite right.
;; Unreferenced locals should be
;; collected.
(set! first #f)
(let loop ((v (thunk)))
(loop (thunk)))
#f)))
(lambda (key . args)
(case key
((quit)
(set! status args)
#f)
((switch-repl)
(apply throw 'switch-repl args))
((abort)
;; This is one of the closures that require
;; (set! first #f) above
;;
(lambda ()
(run-hook abort-hook)
(force-output (current-output-port))
(display "ABORT: " (current-error-port))
(write args (current-error-port))
(newline (current-error-port))
(if interactive
(begin
(if (and
(not has-shown-debugger-hint?)
(not (memq 'backtrace
(debug-options-interface)))
(stack? (fluid-ref the-last-stack)))
(begin
(newline (current-error-port))
(display
"Type \"(backtrace)\" to get more information or \"(debug)\" to enter the debugger.\n"
(current-error-port))
(set! has-shown-debugger-hint? #t)))
(force-output (current-error-port)))
(begin
(primitive-exit 1)))
(set! stack-saved? #f)))
(else
;; This is the other cons-leak closure...
(lambda ()
(cond ((= (length args) 4)
(apply handle-system-error key args))
(else
(apply bad-throw key args)))))))
default-pre-unwind-handler)))
(if next (loop next) status)))
(set! ensure-batch-mode! (lambda ()
(set! interactive #f)
(restore-signals)))
(set! batch-mode? (lambda () (not interactive)))
(call-with-blocked-asyncs
(lambda () (loop (lambda () #t))))))
(define (error-catching-repl r e p)
(error-catching-loop
(lambda ()
(call-with-values (lambda () (e (r)))
(lambda the-values (for-each p the-values))))))
(define (scm-style-repl)
(letrec (
(start-gc-rt #f)
(start-rt #f)
(repl-report-start-timing (lambda ()
(set! start-gc-rt (gc-run-time))
(set! start-rt (get-internal-run-time))))
(repl-report (lambda ()
(display ";;; ")
(display (inexact->exact
(* 1000 (/ (- (get-internal-run-time) start-rt)
internal-time-units-per-second))))
(display " msec (")
(display (inexact->exact
(* 1000 (/ (- (gc-run-time) start-gc-rt)
internal-time-units-per-second))))
(display " msec in gc)\n")))
(consume-trailing-whitespace
(lambda ()
(let ((ch (peek-char)))
(cond
((eof-object? ch))
((or (char=? ch #\space) (char=? ch #\tab))
(read-char)
(consume-trailing-whitespace))
((char=? ch #\newline)
(read-char))))))
(-read (lambda ()
(let ((val
(let ((prompt (cond ((string? scm-repl-prompt)
scm-repl-prompt)
((thunk? scm-repl-prompt)
(scm-repl-prompt))
(scm-repl-prompt "> ")
(else ""))))
(repl-reader prompt))))
;; As described in R4RS, the READ procedure updates the
;; port to point to the first character past the end of
;; the external representation of the object. This
;; means that it doesn't consume the newline typically
;; found after an expression. This means that, when
;; debugging Guile with GDB, GDB gets the newline, which
;; it often interprets as a "continue" command, making
;; breakpoints kind of useless. So, consume any
;; trailing newline here, as well as any whitespace
;; before it.
;; But not if EOF, for control-D.
(if (not (eof-object? val))
(consume-trailing-whitespace))
(run-hook after-read-hook)
(if (eof-object? val)
(begin
(repl-report-start-timing)
(if scm-repl-verbose
(begin
(newline)
(display ";;; EOF -- quitting")
(newline)))
(quit 0)))
val)))
(-eval (lambda (sourc)
(repl-report-start-timing)
(run-hook before-eval-hook sourc)
(let ((val (start-stack 'repl-stack
;; If you change this procedure
;; (primitive-eval), please also
;; modify the repl-stack case in
;; save-stack so that stack cutting
;; continues to work.
(primitive-eval sourc))))
(run-hook after-eval-hook sourc)
val)))
(-print (let ((maybe-print (lambda (result)
(if (or scm-repl-print-unspecified
(not (unspecified? result)))
(begin
(write result)
(newline))))))
(lambda (result)
(if (not scm-repl-silent)
(begin
(run-hook before-print-hook result)
(maybe-print result)
(run-hook after-print-hook result)
(if scm-repl-verbose
(repl-report))
(force-output))))))
(-quit (lambda (args)
(if scm-repl-verbose
(begin
(display ";;; QUIT executed, repl exitting")
(newline)
(repl-report)))
args)))
(let ((status (error-catching-repl -read
-eval
-print)))
(-quit status))))
(define (handle-system-error key . args)
(let ((cep (current-error-port)))
(cond ((not (stack? (fluid-ref the-last-stack))))
((memq 'backtrace (debug-options-interface))
(let ((highlights (if (or (eq? key 'wrong-type-arg)
(eq? key 'out-of-range))
(list-ref args 3)
'())))
(run-hook before-backtrace-hook)
(newline cep)
(display "Backtrace:\n")
(display-backtrace (fluid-ref the-last-stack) cep
#f #f highlights)
(newline cep)
(run-hook after-backtrace-hook))))
(run-hook before-error-hook)
(apply display-error (fluid-ref the-last-stack) cep args)
(run-hook after-error-hook)
(force-output cep)
(throw 'abort key)))