contrib/sb-aclrepl/debug.lisp

   1 ;;;; Debugger for sb-aclrepl
   2 ;;;;
   3 ;;;; The documentation, which may or may not apply in its entirety at
   4 ;;;; any given time, for this functionality is on the ACL website:
   5 ;;;;   <http://www.franz.com/support/documentation/6.2/doc/top-level.htm>.
   6
   7 (cl:in-package :sb-aclrepl)
   8
   9 ;;; FIXME: These declaims violate package locks. Are they needed at
  10 ;;; all? Seems not.
  11 #+ignore
  12 (declaim (special
  13           sb-debug::*debug-command-level*
  14           sb-debug::*real-stack-top* sb-debug::*stack-top*
  15           sb-debug::*stack-top-hint* sb-debug::*current-frame*
  16           sb-debug::*flush-debug-errors*))
  17
  18 (defun debug-loop ()
  19   (let* ((sb-debug::*debug-command-level* (1+ sb-debug::*debug-command-level*))
  20          (sb-debug::*real-stack-top* (sb-di:top-frame))
  21          (sb-debug::*stack-top* (or sb-debug::*stack-top-hint*
  22                                     sb-debug::*real-stack-top*))
  23          (sb-debug::*stack-top-hint* nil)
  24          (sb-debug::*current-frame* sb-debug::*stack-top*)
  25          (continuable (continuable-break-p)))
  26     (handler-bind ((sb-di:debug-condition
  27                     (lambda (condition)
  28                       (princ condition sb-debug::*debug-io*)
  29                       (throw 'debug-loop-catcher nil))))
  30       (fresh-line)
  31       ;;(sb-debug::print-frame-call sb-debug::*current-frame* :verbosity 2)
  32       (loop ;; only valid to way to exit invoke-debugger is by a restart
  33        (catch 'debug-loop-catcher
  34          (handler-bind ((error (lambda (condition)
  35                                  (when sb-debug::*flush-debug-errors*
  36                                    (clear-input *debug-io*)
  37                                    (princ condition)
  38                                    ;; FIXME: Doing input on *DEBUG-IO*
  39                                    ;; and output on T seems broken.
  40                                    (format t
  41                                            "~&error flushed (because ~
  42                                              ~S is set)"
  43                                           'sb-debug::*flush-debug-errors*)
  44                                    (throw 'debug-loop-catcher nil)))))
  45
  46            (if (zerop *break-level*) ; restart added by SBCL
  47                (repl :continuable continuable)
  48                (let ((level *break-level*))
  49                  (with-simple-restart
  50                      (abort "~@<Reduce debugger level (to break level ~W).~@:>"
  51                             level)
  52                    (let ((sb-debug::*debug-restarts* (compute-restarts)))
  53                      (repl :continuable continuable)))))))
  54        (throw 'repl-catcher (values :debug :exit))
  55        ))))
  56
  57
  58 (defun continuable-break-p ()
  59   (when (eq 'continue
  60             (restart-name (car (compute-restarts))))
  61     t))
  62
  63 #+ignore
  64 (when (boundp 'sb-debug::*debug-loop-fun*)
  65   (setq sb-debug::*debug-loop-fun* #'debug-loop))
  66
  67 (defun print-restarts ()
  68   ;;  (format *output* "~&Restart actions (select using :continue)~%")
  69   (format *standard-output* "~&Restart actions (select using :continue)~%")
  70   (let ((restarts (compute-restarts)))
  71     (dotimes (i (length restarts))
  72       (format *standard-output* "~&~2D: ~A~%" i (nth i restarts)))))
  73
  74
  75 #+ignore
  76 (defun debugger (condition)
  77   "Enter the debugger."
  78   (let ((old-hook *debugger-hook*))
  79     (when old-hook
  80       (let ((*debugger-hook* nil))
  81         (funcall old-hook condition old-hook))))
  82   (%debugger condition))
  83
  84 #+ignore
  85 (when (boundp 'sb-debug::*invoke-debugger-fun*)
  86   (setq sb-debug::*invoke-debugger-fun* #'debugger))
  87
  88 #+ignore
  89 (defun print-condition (condition)
  90   (format *output* "~&Error: ~A~%" condition))
  91
  92 #+ignore
  93 (defun print-condition-type (condition)
  94   (format *output* "~&  [Condition type: ~A]~%" (type-of condition)))
  95
  96 #+ignore
  97 (defun %debugger (condition)
  98   (print-condition condition)
  99   (print-condition-type condition)
 100   (princ #\newline *output*)
 101   (print-restarts)
 102   (acldebug-loop))
 103
 104
 105 #+ignore
 106 (defun acldebug-loop ()
 107   (let ((continuable (continuable-break-p)))
 108     (if continuable
 109         (aclrepl :continuable t)
 110         (let ((level *break-level*))
 111           (with-simple-restart
 112               (abort "~@<Reduce debugger level (to debug level ~W).~@:>" level)
 113             (loop
 114              (repl)))))))
 115