Newer
Older
;;; -*- Mode: Lisp; Package: Debug; Log: code.log -*-
;;;
;;; **********************************************************************
;;; This code was written as part of the CMU Common Lisp project at
;;; Carnegie Mellon University, and has been placed in the public domain.
;;; If you want to use this code or any part of CMU Common Lisp, please contact
;;; Scott Fahlman or slisp-group@cs.cmu.edu.
;;;
(ext:file-comment
"$Header: /Volumes/share2/src/cmucl/cvs2git/cvsroot/src/code/debug.lisp,v 1.37 1993/08/20 00:15:58 ram Exp $")
;;; **********************************************************************
;;;
;;; CMU Common Lisp Debugger. This includes a basic command-line oriented
;;; debugger interface as well as support for Hemlock to deliver debugger
;;; commands to a slave Lisp.
;;; Written by Bill Chiles.
(in-package "DEBUG")
(export '(internal-debug *in-the-debugger* backtrace *flush-debug-errors*
*help-line-scroll-count* *stack-top-hint*
*auto-eval-in-frame* var arg
*only-block-start-locations* *print-location-kind*
(in-package "LISP")
(export '(invoke-debugger *debugger-hook*))
(in-package "DEBUG")
;;;
;;; Used to communicate to debug-loop that we are at a step breakpoint.
;;;
(define-condition step-condition (simple-condition))
(defparameter *debug-print-level* 3
"*PRINT-LEVEL* is bound to this value when debug prints a function call. If
null, use *PRINT-LEVEL*")
(defparameter *debug-print-length* 5
"*PRINT-LENGTH* is bound to this value when debug prints a function call. If
null, use *PRINT-LENGTH*.")
(defvar *in-the-debugger* nil
"This is T while in the debugger.")
(defvar *debug-command-level* 0
"Pushes and pops/exits inside the debugger change this.")
(defvar *stack-top-hint* nil
"If this is bound before the debugger is invoked, it is used as the stack
top by the debugger.")
(defvar *stack-top* nil)
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
(defvar *real-stack-top* nil)
(defvar *current-frame* nil)
;;; DEBUG-PROMPT -- Internal.
;;;
;;; This is the default for *debug-prompt*.
;;;
(defun debug-prompt ()
(let ((*standard-output* *debug-io*))
(terpri)
(prin1 (di:frame-number *current-frame*))
(dotimes (i *debug-command-level*) (princ "]"))
(princ " ")
(force-output)))
(defparameter *debug-prompt* #'debug-prompt
"This is a function of no arguments that prints the debugger prompt
on *debug-io*.")
(defconstant debug-help-string
"
The prompt is right square brackets, the number indicating how many
recursive command loops you are in.
Debug commands do not affect * and friends, but evaluation in the debug loop
do affect these variables.
Any command may be uniquely abbreviated.
Getting in and out of DEBUG:
Q throws to top level.
GO calls CONTINUE which tries to proceed with the restart 'continue.
RESTART invokes restart numbered as shown (prompt if not given).
ERROR prints the error condition and restart cases.
FLUSH toggles *flush-debug-errors*, which is initially t.
The name of any restart, or its number, is a valid command, and is the same
as using RESTART to invoke that restart.
Changing frames:
U up frame D down frame T top frame B bottom frame
F n goes to frame n.
Inspecting frames:
BACKTRACE [n] shows n frames going down the stack.
L lists locals in current function.
P, PP displays current function call.
SOURCE [n] displays frame's source form with n levels of enclosing forms.
VSOURCE [n] displays frame's source form without any ellipsis.
Breakpoints and steps:
LIST-LOCATIONS [{function | :c}] list the locations for breakpoints.
Specify :c for the current frame. Abbreviation: LL
LIST-BREAKPOINTS list the active breakpoints.
Abbreviations: LB, LBP
DELETE-BREAKPOINT [n] remove breakpoint n or all breakpoints.
Abbreviations: DEL, DBP
BREAKPOINT {n | :end | :start} [:break form] [:function function]
[{:print form}*] [:condition form] set a breakpoint.
Abbreviations: BR, BP
STEP [n] step to the next location or step n times.
Function and macro commands:
(DEBUG:DEBUG-RETURN expression)
returns expression's values from the current frame, exiting the debugger.
(DEBUG:ARG n)
returns the n'th argument, remaining in the debugger.
(DEBUG:VAR string-or-symbol [id])
returns the specified variable's value, remaining in the debugger.
See the CMU Common Lisp User's Manual for more information.
")
;;;; Breakpoint state:
(defvar *only-block-start-locations* nil
"When true, the LIST-LOCATIONS command only displays block start locations.
Otherwise, all locations are displayed.")
(defvar *print-location-kind* nil
"If true, list the code location type in the LIST-LOCATIONS command.")
;;; A list of the types of code-locations that should not be stepped to and
(defvar *bad-code-location-types* '(:call-site :internal-error))
(declaim (type list *bad-code-location-types*))
(defvar *possible-breakpoints*)
(declaim (type list *possible-breakpoints*))
;;; A list of the made and active breakpoints, each is a breakpoint-info
;;; structure.
;;;
(defvar *breakpoints* nil)
(declaim (type list *breakpoints*))
;;; A list of breakpoint-info structures of the made and active step
;;; breakpoints.
;;;
(defvar *step-breakpoints* nil)
(declaim (type list *step-breakpoints*))
;;; Number of times left to step.
;;;
(defvar *number-of-steps* 1)
(declaim (type integer *number-of-steps*))
;;; Used when listing and setting breakpoints.
(declaim (type (or list di:debug-function) *default-breakpoint-debug-function*))
;;;; Code location utilities:
;;; FIRST-CODE-LOCATION -- Internal.
;;;
;;; Returns the first code-location in the passed debug block
;;;
(defun first-code-location (debug-block)
(let ((found nil)
(first-code-location nil))
(di:do-debug-block-locations (code-location debug-block)
(unless found
(setf first-code-location code-location)
(setf found t)))
first-code-location))
;;; NEXT-CODE-LOCATIONS -- Internal.
;;;
(let ((debug-block (di:code-location-debug-block code-location))
(block-code-locations nil))
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
(unless (member (di:code-location-kind block-code-location)
*bad-code-location-types*)
(push block-code-location block-code-locations)))
(setf block-code-locations (nreverse block-code-locations))
(let* ((code-loc-list (rest (member code-location block-code-locations
:test #'di:code-location=)))
(next-list (cond (code-loc-list
(list (first code-loc-list)))
((map 'list #'first-code-location
(di:debug-block-successors debug-block)))
(t nil))))
(when (and (= (length next-list) 1)
(di:code-location= (first next-list) code-location))
(setf next-list (next-code-locations (first next-list))))
next-list)))
;;; POSSIBLE-BREAKPOINTS -- Internal.
;;;
;;; Returns a list of code-locations of the possible breakpoints of the
;;; debug-function passed.
;;;
(defun possible-breakpoints (debug-function)
(let ((possible-breakpoints nil))
(di:do-debug-function-blocks (debug-block debug-function)
(unless (di:debug-block-elsewhere-p debug-block)
(if *only-block-start-locations*
(push (first-code-location debug-block) possible-breakpoints)
(di:do-debug-block-locations (code-location debug-block)
(when (not (member (di:code-location-kind code-location)
*bad-code-location-types*))
(push code-location possible-breakpoints))))))
(nreverse possible-breakpoints)))
;;; LOCATION-IN-LIST -- Internal.
;;;
;;; Searches the info-list for the item passed (code-location, debug-function,
;;; or breakpoint-info). If the item passed is a debug function then kind will
;;; be compared if it was specified. The kind if also compared if a
;;; breakpoint-info is passed since it's in the breakpoint. The info structure
;;; is returned if found.
;;;
(defun location-in-list (place info-list &optional (kind nil))
(when (breakpoint-info-p place)
(setf kind (di:breakpoint-kind (breakpoint-info-breakpoint place)))
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
(setf place (breakpoint-info-place place)))
(cond ((di:code-location-p place)
(find place info-list
:key #'breakpoint-info-place
:test #'(lambda (x y) (and (di:code-location-p y)
(di:code-location= x y)))))
(t
(find place info-list
:test #'(lambda (x-debug-function y-info)
(let ((y-place (breakpoint-info-place y-info))
(y-breakpoint (breakpoint-info-breakpoint
y-info)))
(and (di:debug-function-p y-place)
(eq x-debug-function y-place)
(or (not kind)
(eq kind (di:breakpoint-kind
y-breakpoint))))))))))
;;; MAYBE-BLOCK-START-LOCATION -- Internal.
;;;
;;; If Loc is an unknown location, then try to find the block start location.
;;; Used by source printing to some information instead of none for the user.
;;;
(defun maybe-block-start-location (loc)
(if (di:code-location-unknown-p loc)
(let* ((block (di:code-location-debug-block loc))
(start (di:do-debug-block-locations (loc block)
(return loc))))
(cond ((and (not (di:debug-block-elsewhere-p block))
start)
(format t "~%Unknown location: using block start.~%")
start)
(t
loc)))
loc))
;;;; The BREAKPOINT-INFO structure:
;;; Hold info about made breakpoints
;;;
(defstruct breakpoint-info
;;
;; Where we are going to stop.
(place (required-argument) :type (or di:code-location di:debug-function))
;;
;; The breakpoint returned by di:make-breakpoint.
(breakpoint (required-argument) :type di:breakpoint)
;;
;; Function returned from di:preprocess-for-eval. If result is non-nil,
;; drop into the debugger.
(break #'identity :type function)
;;
;; Function returned from di:preprocess-for-eval. If result is non-nil,
;; eval (each) print and print results.
(condition #'identity :type function)
;;
;; List of functions from di:preprocess-for-eval to evaluate, results are
;; conditionally printed. Car of each element is the function, cdr is the
;; form it goes with.
(print nil :type list)
;;
;; The number used when listing the possible breakpoints within a function.
;; Could also be a symbol such as start or end.
(code-location-number (required-argument) :type (or symbol integer))
;;
;; The number used when listing the breakpoints active and to delete
;; breakpoints.
(breakpoint-number (required-argument) :type integer))
;;; CREATE-BREAKPOINT-INFO -- Internal.
;;;
;;; Returns a new breakpoint-info structure with the info passed.
;;;
(defun create-breakpoint-info (place breakpoint code-location-number
&key (break #'identity)
(condition #'identity) (print nil))
(setf *breakpoints*
(sort *breakpoints* #'< :key #'breakpoint-info-breakpoint-number))
(let ((breakpoint-number
(do ((i 1 (incf i)) (breakpoints *breakpoints* (rest breakpoints)))
((or (> i (length *breakpoints*))
(not (= i (breakpoint-info-breakpoint-number
(first breakpoints)))))
i))))
(make-breakpoint-info :place place :breakpoint breakpoint
:code-location-number code-location-number
:breakpoint-number breakpoint-number
:break break :condition condition :print print)))
;;; PRINT-BREAKPOINT-INFO -- Internal.
;;;
;;; Prints the breakpoint info for the breakpoint-info structure passed.
;;;
(defun print-breakpoint-info (breakpoint-info)
(let ((place (breakpoint-info-place breakpoint-info))
(bp-number (breakpoint-info-breakpoint-number breakpoint-info))
(loc-number (breakpoint-info-code-location-number breakpoint-info)))
(case (di:breakpoint-kind (breakpoint-info-breakpoint breakpoint-info))
(:code-location
(print-code-location-source-form place 0)
(format t "~&~S: ~S in ~S"
bp-number loc-number (di:debug-function-name
(di:code-location-debug-function place))))
(:function-start
(format t "~&~S: FUNCTION-START in ~S" bp-number
(di:debug-function-name place)))
(:function-end
(format t "~&~S: FUNCTION-END in ~S" bp-number
(di:debug-function-name place))))))
;;;; Main-hook-function for steps and breakpoints
;;; MAIN-HOOK-FUNCTION -- Internal.
;;;
;;; Must be passed as the hook function. Keeps track of where step
;;; breakpoints are.
;;;
(defun main-hook-function (current-frame breakpoint &optional return-vals
function-end-cookie)
(setf *default-breakpoint-debug-function*
(di:frame-debug-function current-frame))
(dolist (step-info *step-breakpoints*)
(di:delete-breakpoint (breakpoint-info-breakpoint step-info))
(let ((bp-info (location-in-list step-info *breakpoints*)))
(when bp-info
(di:activate-breakpoint (breakpoint-info-breakpoint bp-info)))))
(let ((*stack-top-hint* current-frame)
(step-hit-info
(location-in-list (di:breakpoint-what breakpoint)
*step-breakpoints* (di:breakpoint-kind breakpoint)))
(bp-hit-info
(location-in-list (di:breakpoint-what breakpoint)
*breakpoints* (di:breakpoint-kind breakpoint)))
(break)
(condition)
(string ""))
(setf *step-breakpoints* nil)
(labels ((build-string (str)
(setf string (concatenate 'string string str)))
(print-common-info ()
(build-string
(with-output-to-string (*standard-output*)
(when function-end-cookie
(format t "~%Return values: ~S" return-vals))
(when condition
(when (breakpoint-info-print bp-hit-info)
(format t "~%")
(print-frame-call current-frame))
(dolist (print (breakpoint-info-print bp-hit-info))
(format t "~& ~S = ~S" (rest print)
(funcall (first print) current-frame))))))))
(when bp-hit-info
(setf break (funcall (breakpoint-info-break bp-hit-info)
current-frame))
(setf condition (funcall (breakpoint-info-condition bp-hit-info)
current-frame)))
(cond ((and bp-hit-info step-hit-info (= 1 *number-of-steps*))
(build-string (format nil "~&*Step (to a breakpoint)*"))
(print-common-info)
(break string))
((and bp-hit-info step-hit-info break)
(build-string (format nil "~&*Step (to a breakpoint)*"))
(print-common-info)
(break string))
((and bp-hit-info step-hit-info)
(print-common-info)
(format t "~A" string)
(decf *number-of-steps*)
(step current-frame))
((and step-hit-info (= 1 *number-of-steps*))
(build-string "*Step*")
(break (make-condition 'step-condition :format-control string)))
(step-hit-info
(decf *number-of-steps*)
(step current-frame))
(bp-hit-info
(when break
(build-string (format nil "~&*Breakpoint hit*")))
(print-common-info)
(if break
(break string)
(format t "~A" string)))
(t
(break "Error in main-hook-function: unknown breakpoint"))))))
;;; STEP -- Internal.
;;;
;;; Sets breakpoints at the next possible code-locations. After calling
;;; this either (continue) if in the debugger or just let program flow
;;; return if in a hook function.
(defun step (frame)
(cond
((di:debug-block-elsewhere-p (di:code-location-debug-block
(di:frame-code-location frame)))
(let* ((code-location (di:frame-code-location frame))
(next-code-locations (next-code-locations code-location)))
(cond
(next-code-locations
(dolist (code-location next-code-locations)
(let ((bp-info (location-in-list code-location *breakpoints*)))
(when bp-info
(di:deactivate-breakpoint (breakpoint-info-breakpoint bp-info))))
(let ((bp (di:make-breakpoint #'main-hook-function code-location
:kind :code-location)))
(di:activate-breakpoint bp)
(push (create-breakpoint-info code-location bp 0)
*step-breakpoints*))))
(t
(let* ((debug-function (di:frame-debug-function *current-frame*))
(bp (di:make-breakpoint #'main-hook-function debug-function
:kind :function-end)))
(push (create-breakpoint-info debug-function bp 0)
*step-breakpoints*))))))))
;;;; Backtrace:
;;; BACKTRACE -- Public.
;;;
(defun backtrace (&optional (count most-positive-fixnum)
(*standard-output* *debug-io*))
"Show a listing of the call stack going down from the current frame. In the
debugger, the current frame is indicated by the prompt. Count is how many
frames to show."
(let ((*print-length* (or *debug-print-length* *print-length*))
(*print-level* (or *debug-print-level* *print-level*)))
(fresh-line *standard-output*)
(do ((frame (if *in-the-debugger* *current-frame* (di:top-frame))
(di:frame-down frame))
(count count (1- count)))
((or (null frame) (zerop count))
(values))
(print-frame-call frame :number t))))
;;;; Frame printing:
(eval-when (compile eval)
;;;
;;; This is a convenient way to express what to do for each type of lambda-list
;;; element.
;;;
(defmacro lambda-list-element-dispatch (element &key required optional rest
keyword deleted)
`(etypecase ,element
(di:debug-variable
,@required)
(cons
(ecase (car ,element)
(:optional ,@optional)
(:rest ,@rest)
(:keyword ,@keyword)))
(symbol
(assert (eq ,element :deleted))
,@deleted)))
(defmacro lambda-var-dispatch (variable location deleted valid other)
(let ((var (gensym)))
`(let ((,var ,variable))
(cond ((eq ,var :deleted) ,deleted)
((eq (di:debug-variable-validity ,var ,location) :valid) ,valid)
) ;EVAL-WHEN
;;; This is used in constructing arg lists for debugger printing when the arg
;;; list is unavailable, some arg is unavailable or unused, etc.
;;;
(defstruct (unprintable-object
(:constructor make-unprintable-object (string))
(:print-function (lambda (x s d)
(declare (ignore d))
(format s "#<~A>"
(unprintable-object-string x)))))
string)
;;; PRINT-FRAME-CALL-1 -- Internal.
;;;
;;; This prints frame with verbosity level 1. If we hit a rest-arg,
;;; punting the loop over lambda-list variables since any other arguments
;;; will be in the rest-arg's list of values.
;;;
(defun print-frame-call-1 (frame)
(let* ((d-fun (di:frame-debug-function frame))
(loc (di:frame-code-location frame))
(results (list (di:debug-function-name d-fun))))
(handler-case
(dolist (ele (di:debug-function-lambda-list d-fun))
(lambda-list-element-dispatch ele
:required ((push (frame-call-arg ele loc frame) results))
:optional ((push (frame-call-arg (second ele) loc frame) results))
:keyword ((push (second ele) results)
(push (frame-call-arg (third ele) loc frame) results))
:deleted ((push (frame-call-arg ele loc frame) results))
:rest ((lambda-var-dispatch (second ele) loc
nil
(progn
(setf results
(append (reverse (di:debug-variable-value
(second ele) frame))
results))
(return))
(push (make-unprintable-object "unavaliable-rest-arg")
()
(push (make-unprintable-object "lambda-list-unavailable") results)))
(prin1 (nreverse results))
(when (di:debug-function-kind d-fun)
(prin1 (di:debug-function-kind d-fun))
;;;
(defun frame-call-arg (var location frame)
(lambda-var-dispatch var location
(make-unprintable-object "unused-arg")
(di:debug-variable-value var frame)
;;; PRINT-FRAME-CALL -- Interface
;;;
;;; This prints a representation of the function call causing frame to exist.
;;; Verbosity indicates the level of information to output; zero indicates just
;;; printing the debug-function's name, and one indicates displaying call-like,
;;; one-liner format with argument values.
;;;
(defun print-frame-call (frame &key
((:print-length *print-length*)
(or *debug-print-length* *print-length*))
((:print-level *print-level*)
(or *debug-print-level* *print-level*))
(verbosity 1)
(cond
((zerop verbosity)
(when number
(format t "~&~S: " (di:frame-number frame)))
(format t "~S" frame))
(t
(when number
(format t "~&~S: " (di:frame-number frame)))
(print-frame-call-1 frame)))
(when (>= verbosity 2)
(let ((loc (di:frame-code-location frame)))
(handler-case
(progn
(di:code-location-debug-block loc)
(format t "~%Source: ")
(print-code-location-source-form loc 0))
(di:debug-condition (ignore) ignore)
(error (cond) (format t "Error finding source: ~A" cond))))))
"This is either nil or a function of two arguments, a condition and the value
of *debugger-hook*. This function can either handle the condition or return
which causes the standard debugger to execute. The system passes the value
of this variable to the function because it binds *debugger-hook* to nil
around the invocation.")
;;; These are bound on each invocation of INVOKE-DEBUGGER.
;;;
(defvar *debug-restarts*)
(defvar *debug-condition*)
;;; INVOKE-DEBUGGER -- Public.
;;;
(defun invoke-debugger (condition)
"The CMU Common Lisp debugger. Type h for help."
(when *debugger-hook*
(let ((hook *debugger-hook*)
(*debugger-hook* nil))
(funcall hook condition hook)))
(unix:unix-sigsetmask 0)
(let* ((*debug-condition* condition)
(*debug-restarts* (compute-restarts condition))
(*standard-input* *debug-io*) ;in case of setq
(*standard-output* *debug-io*) ;'' '' '' ''
(*error-output* *debug-io*)
(kernel:*current-level* 0)
(*read-eval* t))
(format *error-output* "~2&~A~2&" *debug-condition*)
(unless (typep condition 'step-condition)
(show-restarts *debug-restarts* *error-output*))
(internal-debug)))
;;;
(defun show-restarts (restarts &optional (s *error-output*))
(when restarts
(format s "~&Restarts:~%")
(let ((count 0)
(names-used '(nil))
(max-name-len 0))
(dolist (restart restarts)
(let ((name (restart-name restart)))
(let ((len (length (princ-to-string name))))
(when (> len max-name-len)
(setf max-name-len len))))))
(unless (zerop max-name-len)
(dolist (restart restarts)
(let ((name (restart-name restart)))
(cond ((member name names-used)
(format s "~& ~2D: ~@VT~A~%" count max-name-len restart))
(t
(format s "~& ~2D: [~VA] ~A~%"
count (- max-name-len 3) name restart)
(push name names-used))))
(incf count)))))
;;; INTERNAL-DEBUG -- Internal Interface.
;;;
;;; This calls DEBUG-LOOP, performing some simple initializations before doing
;;; so. INVOKE-DEBUGGER calls this to actually get into the debugger.
;;; CONDITIONS::ERROR-ERROR calls this in emergencies to get into a debug
;;; prompt as quickly as possible with as little risk as possible for stepping
;;; on whatever is causing recursive errors.
(defun internal-debug ()
(let ((*in-the-debugger* t)
(*read-suppress* nil))
(unless (typep *debug-condition* 'step-condition)
(format *debug-io* "~2&Debug (type H for help)~2%"))
;;;; Debug-loop.
(defvar *flush-debug-errors* t
"When set, avoid calling INVOKE-DEBUGGER recursively when errors occur while
executing in the debugger. The 'flush' command toggles this.")
(defun debug-loop ()
(let* ((*debug-command-level* (1+ *debug-command-level*))
(*real-stack-top* (di:top-frame))
(*stack-top* (or *stack-top-hint* *real-stack-top*))
(*stack-top-hint* nil)
(*current-frame* *stack-top*))
(handler-bind ((di:debug-condition #'(lambda (condition)
(princ condition *debug-io*)
(throw 'debug-loop-catcher nil))))
(fresh-line)
(print-frame-call *current-frame* :verbosity 2)
(loop
(catch 'debug-loop-catcher
(handler-bind ((error #'(lambda (condition)
(clear-input *debug-io*)
(princ condition)
(format t "~&Error flushed ...")
(throw 'debug-loop-catcher nil)))))
;; Must bind level for restart function created by
;; WITH-SIMPLE-RESTART.
(let ((level *debug-command-level*)
(restart-commands (make-restart-commands)))
(with-simple-restart (abort "Return to debug level ~D." level)
(funcall *debug-prompt*)
(let ((input (ext:get-stream-command *debug-io*)))
(cond (input
(let ((cmd-fun (debug-command-p
(ext:stream-command-name input)
restart-commands)))
(cond
((not cmd-fun)
(error "Unknown stream-command -- ~S." input))
((consp cmd-fun)
(error "Ambiguous debugger command: ~S." cmd-fun))
(t
(apply cmd-fun (ext:stream-command-args input))))))
(t
(let* ((exp (read))
(cmd-fun (debug-command-p exp restart-commands)))
(cond ((not cmd-fun)
(debug-eval-print exp))
((consp cmd-fun)
(format t "~&Your command, ~S, is ambiguous:~%"
exp)
(dolist (ele cmd-fun)
(format t " ~A~%" ele)))
(t
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
(funcall cmd-fun)))))))))))))))
(defvar *auto-eval-in-frame* t
"When set (the default), evaluations in the debugger's command loop occur
relative to the current frame's environment without the need of debugger
forms that explicitly control this kind of evaluation.")
(defun debug-eval-print (exp)
(setq +++ ++ ++ + + - - exp)
(let* ((values (multiple-value-list
(if (and (fboundp 'eval:internal-eval) *auto-eval-in-frame*)
(di:eval-in-frame *current-frame* -)
(eval -))))
(*standard-output* *debug-io*))
(fresh-line)
(if values (prin1 (car values)))
(dolist (x (cdr values))
(fresh-line)
(prin1 x))
(setq /// // // / / values)
(setq *** ** ** * * (car values))
;; Make sure nobody passes back an unbound marker.
(unless (boundp '*)
(setq * nil)
(fresh-line)
(princ "Setting * to NIL -- was unbound marker."))))
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
;;;; Debug loop functions.
;;; These commands are function, not really commands, so users can get their
;;; hands on the values returned.
;;;
(eval-when (eval compile)
(defmacro define-var-operation (ref-or-set &optional value-var)
`(let* ((temp (etypecase name
(symbol (di:debug-function-symbol-variables
(di:frame-debug-function *current-frame*)
name))
(simple-string (di:ambiguous-debug-variables
(di:frame-debug-function *current-frame*)
name))))
(location (di:frame-code-location *current-frame*))
;; Let's only deal with valid variables.
(vars (remove-if-not #'(lambda (v)
(eq (di:debug-variable-validity v location)
:valid))
temp)))
(declare (list vars))
(cond ((null vars)
(error "No known valid variables match ~S." name))
((= (length vars) 1)
,(ecase ref-or-set
(:ref
'(di:debug-variable-value (car vars) *current-frame*))
(:set
`(setf (di:debug-variable-value (car vars) *current-frame*)
,value-var))))
(t
;; Since we have more than one, first see if we have any
;; variables that exactly match the specification.
(let* ((name (etypecase name
(symbol (symbol-name name))
(simple-string name)))
(exact (remove-if-not #'(lambda (v)
(string= (di:debug-variable-name v)
name))
vars))
(vars (or exact vars)))
(declare (simple-string name)
(list exact vars))
(cond
;; Check now for only having one variable.
((= (length vars) 1)
,(ecase ref-or-set
(:ref
'(di:debug-variable-value (car vars) *current-frame*))
(:set
`(setf (di:debug-variable-value (car vars) *current-frame*)
,value-var))))
;; If there weren't any exact matches, flame about ambiguity
;; unless all the variables have the same name.
((and (not exact)
(find-if-not
#'(lambda (v)
(string= (di:debug-variable-name v)
(di:debug-variable-name (car vars))))
(cdr vars)))
(error "Specification ambiguous:~%~{ ~A~%~}"
(mapcar #'di:debug-variable-name
(delete-duplicates
vars :test #'string=
:key #'di:debug-variable-name))))
;; All names are the same, so see if the user ID'ed one of them.
(id-supplied
(let ((v (find id vars :key #'di:debug-variable-id)))
(unless v
(error "Invalid variable ID, ~D, should have been one of ~S."
'(di:debug-variable-value v *current-frame*))
(:set
`(setf (di:debug-variable-value v *current-frame*)
,value-var)))))
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
(t
(error "Specify variable ID to disambiguate ~S. Use one of ~S."
name (mapcar #'di:debug-variable-id vars)))))))))
) ;EVAL-WHEN
;;; VAR -- Public.
;;;
(defun var (name &optional (id 0 id-supplied))
"Returns a variable's value if possible. Name is a simple-string or symbol.
If it is a simple-string, it is an initial substring of the variable's name.
If name is a symbol, it has the same name and package as the variable whose
value this function returns. If the symbol is uninterned, then the variable
has the same name as the symbol, but it has no package.
If name is the initial substring of variables with different names, then
this return no values after displaying the ambiguous names. If name
determines multiple variables with the same name, then you must use the
optional id argument to specify which one you want. If you left id
unspecified, then this returns no values after displaying the distinguishing
id values.
The result of this function is limited to the availability of variable
information. This is SETF'able."
(define-var-operation :ref))
;;;
(defun (setf var) (value name &optional (id 0 id-supplied))
(define-var-operation :set value))
;;; ARG -- Public.
;;;
(defun arg (n)
"Returns the n'th argument's value if possible. Argument zero is the first
argument in a frame's default printed representation. Count keyword/value
pairs as separate arguments."
(multiple-value-bind
(var lambda-var-p)
(nth-arg n (handler-case (di:debug-function-lambda-list
(di:frame-debug-function *current-frame*))
(di:lambda-list-unavailable ()
(error "No argument values are available."))))
(if lambda-var-p
(lambda-var-dispatch var (di:frame-code-location *current-frame*)
(error "Unused arguments have no values.")
(error "Invalid argument value."))
;;; NTH-ARG -- Internal.
;;;
;;; This returns the n'th arg as the user sees it from args, the result of
;;; DI:DEBUG-FUNCTION-LAMBDA-LIST. If this returns a potential debug-variable
;;; from the lambda-list, then the second value is t. If this returns a
;;; keyword symbol or a value from a rest arg, then the second value is nil.
;;;
(defun nth-arg (count args)
(let ((n count))
(dolist (ele args (error "Argument specification out of range -- ~S." n))
(lambda-list-element-dispatch ele
:optional ((if (zerop n) (return (values (second ele) t))))
:keyword ((cond ((zerop n)
(return (values (second ele) nil)))
((zerop (decf n))
(return (values (third ele) t)))))
:deleted ((if (zerop n) (return (values ele t))))
:rest ((let ((var (second ele)))
(lambda-var-dispatch var
(di:frame-code-location *current-frame*)
(error "Unused rest-arg before n'th argument.")
(dolist (value
(di:debug-variable-value var *current-frame*)
(error "Argument specification out of range -- ~S."
n))
(if (zerop n)
(return-from nth-arg (values value nil))
(decf n)))
(error "Invalid rest-arg before n'th argument.")))))
(decf n))))
;;;; Debug loop command definition:
(defvar *debug-commands* nil)
;;; DEF-DEBUG-COMMAND -- Internal.
;;;
;;; Interface to *debug-commands*. No required arguments in args are
;;; permitted.
;;;
(defmacro def-debug-command (name args &rest body)
(let ((fun-name (intern (concatenate 'simple-string name "-DEBUG-COMMAND"))))
`(progn
(when (assoc ,name *debug-commands* :test #'string=)
(setf *debug-commands*
(remove ,name *debug-commands* :key #'car :test #'string=)))
(defun ,fun-name ,args
(unless *in-the-debugger*
(error "Invoking debugger command while outside the debugger."))
,@body)
(push (cons ,name #',fun-name) *debug-commands*)
',fun-name)))
;;; DEF-DEBUG-COMMAND-ALIAS -- Internal.
;;;
(defun def-debug-command-alias (new-name existing-name)
(let ((pair (assoc existing-name *debug-commands* :test #'string=)))
(unless pair (error "Unknown debug command name -- ~S" existing-name))
(push (cons new-name (cdr pair)) *debug-commands*))
new-name)
;;; DEBUG-COMMAND-P -- Internal.
;;;
;;; This takes a symbol and uses its name to find a debugger command, using
;;; initial substring matching. It returns the command function if form
;;; identifies only one command, but if form is ambiguous, this returns a list
;;; of the command names. If there are no matches, this returns nil. Whenever
;;; the loop that looks for a set of possibilities encounters an exact name
;;; match, we return that command function immediately.
;;;
(if (or (symbolp form) (integerp form))
(if (symbolp form)
(symbol-name form)
(format nil "~d" form)))
(len (length name))
(res nil))
(declare (simple-string name)
(fixnum len)
(list res))
;;
;; Find matching commands, punting if exact match.
(flet ((match-command (ele)
(let* ((str (car ele))
(str-len (length str)))
(declare (simple-string str)
(fixnum str-len))
(cond ((< str-len len))
((= str-len len)
(when (string= name str :end1 len :end2 len)
(return-from debug-command-p (cdr ele))))
((string= name str :end1 len :end2 len)
(push ele res))))))
(mapc #'match-command *debug-commands*)
(mapc #'match-command other-commands))
;;
((= (length res) 1)
(cdar res))
(t ;Just return the names.
(do ((cmds res (cdr cmds)))
((not cmds) res)
(setf (car cmds) (caar cmds))))))))
;;; Returns a list of debug commands (in the same format as *debug-commands*)
;;; that invoke each active restart.
;;;
;;; Two commands are made for each restart: one for the number, and one for
;;; the restart name (unless it's been shadowed by an earlier restart of the
;;; same name.
;;;
(defun make-restart-commands (&optional (restarts *debug-restarts*))
(let ((commands)
(num 0)) ; better be the same as show-restarts!
(let ((name (string (restart-name restart))))
(unless (find name commands :key #'car :test #'string=)
(let ((restart-fun
#'(lambda ()
(invoke-restart-interactively restart))))
(push (cons name restart-fun) commands)
(push (cons (format nil "~d" num) restart-fun) commands))))
commands))
;;;
;;; Frame changing commands.
;;;
(def-debug-command "UP" ()
(let ((next (di:frame-up *current-frame*)))
(cond (next
(setf *current-frame* next)
(print-frame-call next))
(t
(format t "~&Top of stack.")))))
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
(def-debug-command "DOWN" ()
(let ((next (di:frame-down *current-frame*)))
(cond (next
(setf *current-frame* next)
(print-frame-call next))
(t
(format t "~&Bottom of stack.")))))
(def-debug-command-alias "D" "DOWN")
(def-debug-command "TOP" ()
(do ((prev *current-frame* lead)
(lead (di:frame-up *current-frame*) (di:frame-up lead)))
((null lead)
(setf *current-frame* prev)
(print-frame-call prev))))
(def-debug-command "BOTTOM" ()
(do ((prev *current-frame* lead)
(lead (di:frame-down *current-frame*) (di:frame-down lead)))
((null lead)
(setf *current-frame* prev)
(print-frame-call prev))))
(n (read-prompting-maybe "Frame number: ")))
(let ((current (di:frame-number *current-frame*)))
(setf *current-frame*
(do ((prev *current-frame* lead)
(lead (di:frame-down *current-frame*)
((null lead)
(princ "Bottom of stack encountered.")
prev)
(when (= n (di:frame-number prev))
(return prev))))))
(print-frame-call
(setf *current-frame*
(do ((prev *current-frame* lead)
(lead (di:frame-up *current-frame*)
(di:frame-up lead)))
((null lead)
(princ "Top of stack encountered.")
prev)
(when (= n (di:frame-number prev))
(return prev)))))))))
(def-debug-command-alias "F" "FRAME")
;;; In and Out commands.
(def-debug-command "QUIT" ()
(continue *debug-condition*)
(def-debug-command "RESTART" ()
(let ((num (read-if-available :prompt)))
(when (eq num :prompt)
(show-restarts *debug-restarts*)
(write-string "Restart: ")
(force-output)
(setf num (read *standard-input*)))
(let ((restart (typecase num
(unsigned-byte
(nth num *debug-restarts*))
(symbol
(find num *debug-restarts* :key #'restart-name
:test #'(lambda (sym1 sym2)
(string= (symbol-name sym1)
(symbol-name sym2)))))
(format t "~S is invalid as a restart name.~%" num)
(return-from restart-debug-command nil)))))
(if restart
(invoke-restart-interactively restart)
"This controls how many lines the debugger's help command prints before
(def-debug-command "HELP" ()
(let ((start (1+ end))
(count *help-line-scroll-count*))
(loop
(setf end (position #\newline debug-help-string :start (1+ end)))
(cond ((or (not end) (= end len-1))
(setf end len)
(return))
((or (zerop (decf count)) (= end len))
(return))))
(write-string debug-help-string *standard-output*
:start start :end end))
(when (= end len) (return))
(format t "~%[RETURN FOR MORE, Q TO QUIT HELP TEXT]: ")
(force-output)
(let ((res (read-line)))
(when (or (string= res "q") (string= res "Q"))
(return))))))
(def-debug-command-alias "?" "HELP")
(def-debug-command "ERROR" ()
(format t "~A~%" *debug-condition*)
(show-restarts *debug-restarts*))
(def-debug-command "BACKTRACE" ()
(backtrace (read-if-available most-positive-fixnum)))
(def-debug-command "PRINT" ()
(print-frame-call *current-frame*))
(def-debug-command-alias "P" "PRINT")
(print-frame-call *current-frame* :print-level nil :print-length nil
:verbosity (read-if-available 2)))
(def-debug-command-alias "PP" "VPRINT")
(def-debug-command "LIST-LOCALS" ()
(let ((d-fun (di:frame-debug-function *current-frame*)))
(if (di:debug-variable-info-available d-fun)
(let ((*print-level* (or *debug-print-level* *print-level*))
(*print-length* (or *debug-print-length* *print-length*))
(location (di:frame-code-location *current-frame*))
(prefix (read-if-available nil))
(any-p nil)
(any-valid-p nil))
(dolist (v (di:ambiguous-debug-variables
(if prefix (string prefix) "")))
(setf any-p t)
(when (eq (di:debug-variable-validity v location) :valid)
(setf any-valid-p t)
(format t "~A~:[#~D~;~*~] = ~S~%"
(di:debug-variable-name v)
(zerop (di:debug-variable-id v))
(di:debug-variable-id v)
(di:debug-variable-value v *current-frame*))))
(cond
((not any-p)
(format t "No local variables ~@[starting with ~A ~]~
in function."
prefix))
((not any-valid-p)
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
(format t "All variables ~@[starting with ~A ~]currently ~
have invalid values."
prefix))))
(write-line "No variable information available."))))
(def-debug-command-alias "L" "LIST-LOCALS")
(def-debug-command "SOURCE" ()
(fresh-line)
(print-code-location-source-form (di:frame-code-location *current-frame*)
(read-if-available 0)))
(def-debug-command "VSOURCE" ()
(fresh-line)
(print-code-location-source-form (di:frame-code-location *current-frame*)
(read-if-available 0)
t))
;;;; Source location printing:
;;; We cache a stream to the last valid file debug source so that we won't have
;;; to repeatedly open the file.
;;;
(defvar *cached-debug-source* nil)
(declaim (type (or di:debug-source null) *cached-debug-source*))
(defvar *cached-source-stream* nil)
(declaim (type (or stream null) *cached-source-stream*))
(pushnew #'(lambda ()
;;; We also cache the last top-level form that we printed a source for so that
;;;
(defvar *cached-top-level-form-offset* nil)
(declaim (type (or kernel:index null) *cached-top-level-form-offset*))
(defvar *cached-top-level-form*)
(defvar *cached-form-number-translations*)
;;; GET-TOP-LEVEL-FORM -- Internal
;;;
;;; Given a code location, return the associated form-number translations
;;; and the actual top-level form. We check our cache --- if there is a miss,
;;; we dispatch on the kind of the debug source.
;;;
(defun get-top-level-form (location)
(let ((d-source (di:code-location-debug-source location)))
(if (and (eq d-source *cached-debug-source*)
(eql (di:code-location-top-level-form-offset location)
*cached-top-level-form-offset*))
(values *cached-form-number-translations* *cached-top-level-form*)
(res
(ecase (di:debug-source-from d-source)
(:file (get-file-top-level-form location))
((:lisp :stream)
(svref (di:debug-source-name d-source) offset)))))
(setq *cached-top-level-form-offset* offset)
(values (setq *cached-form-number-translations*
(setq *cached-top-level-form* res))))))
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
;;; GET-FILE-TOP-LEVEL-FORM -- Internal.
;;;
;;; Locates the source file (if it still exists) and grabs the top-level form.
;;; If the file is modified, we use the top-level-form offset instead of the
;;; recorded character offset.
;;;
(defun get-file-top-level-form (location)
(let* ((d-source (di:code-location-debug-source location))
(tlf-offset (di:code-location-top-level-form-offset location))
(local-tlf-offset (- tlf-offset
(di:debug-source-root-number d-source)))
(char-offset
(aref (or (di:debug-source-start-positions d-source)
(error "No start positions map."))
local-tlf-offset))
(name (di:debug-source-name d-source)))
(unless (eq d-source *cached-debug-source*)
(unless (and *cached-source-stream*
(equal (pathname *cached-source-stream*)
(pathname name)))
(when *cached-source-stream* (close *cached-source-stream*))
(setq *cached-source-stream* (open name :if-does-not-exist nil))
(unless *cached-source-stream*
(error "Source file no longer exists:~% ~A." (namestring name)))
(format t "~%; File: ~A~%" (namestring name)))
(setq *cached-debug-source*
(if (= (di:debug-source-created d-source) (file-write-date name))
d-source nil)))
(cond
((eq *cached-debug-source* d-source)
(file-position *cached-source-stream* char-offset))
(t
(format t "~%; File has been modified since compilation:~%; ~A~@
; Using form offset instead of character position.~%"
(namestring name))
(file-position *cached-source-stream* 0)
(let ((*read-suppress* t))
(dotimes (i local-tlf-offset)
(read *cached-source-stream*)))))
(read *cached-source-stream*)))
;;; PRINT-CODE-LOCATION-SOURCE-FORM -- Internal.
;;;
(defun print-code-location-source-form (location context &optional verbose)
(let* ((location (maybe-block-start-location location))
(*print-level* (if verbose
nil
(or *debug-print-level* *print-level*)))
(*print-length* (if verbose
nil
(or *debug-print-length* *print-length*)))
(form-num (di:code-location-form-number location)))
(multiple-value-bind (translations form)
(get-top-level-form location)
(unless (< form-num (length translations))
(error "Source path no longer exists."))
(prin1 (di:source-path-context form
(svref translations form-num)
context)))))
;;;
;;; Breakpoint and step commands.
;;;
;;; Steps to the next code-location
(def-debug-command "STEP" ()
(setf *number-of-steps* (read-if-available 1))
(step *current-frame*)
(continue *debug-condition*)
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
(error "Couldn't continue."))
;;; Lists possible breakpoint locations, which are active, and where go will
;;; continue. Sets *possible-breakpoints* to the code-locations which can then
;;; be used by sbreakpoint. Takes a function as an optional argument.
(def-debug-command "LIST-LOCATIONS" ()
(let ((df (read-if-available *default-breakpoint-debug-function*)))
(cond ((consp df)
(setf df (di:function-debug-function (eval df)))
(setf *default-breakpoint-debug-function* df))
((or (eq ':c df)
(not *default-breakpoint-debug-function*))
(setf df (di:frame-debug-function *current-frame*))
(setf *default-breakpoint-debug-function* df)))
(setf *possible-breakpoints* (possible-breakpoints df)))
(let ((continue-at (di:frame-code-location *current-frame*)))
(let ((active (location-in-list *default-breakpoint-debug-function*
*breakpoints* :function-start))
(here (di:code-location=
(di:debug-function-start-location
*default-breakpoint-debug-function*) continue-at)))
(when (or active here)
(format t "::FUNCTION-START ")
(when active (format t " *Active*"))
(when here (format t " *Continue here*"))))
(let ((prev-location nil)
(prev-num 0)
(this-num 0))
(flet ((flush ()
(when prev-location
(let ((this-num (1- this-num)))
(if (= prev-num this-num)
(format t "~&~D: " prev-num)
(format t "~&~D-~D: " prev-num this-num)))
(print-code-location-source-form prev-location 0)
(when *print-location-kind*
(format t "~S " (di:code-location-kind prev-location)))
(when (location-in-list prev-location *breakpoints*)
(format t " *Active*"))
(when (di:code-location= prev-location continue-at)
(format t " *Continue here*")))))
(dolist (code-location *possible-breakpoints*)
(when (or *print-location-kind*
(location-in-list code-location *breakpoints*)
(di:code-location= code-location continue-at)
(not prev-location)
(not (eq (di:code-location-debug-source code-location)
(di:code-location-debug-source prev-location)))
(not (eq (di:code-location-top-level-form-offset
code-location)
(di:code-location-top-level-form-offset
prev-location)))
(not (eq (di:code-location-form-number code-location)
(di:code-location-form-number prev-location))))
(flush)
(setq prev-location code-location prev-num this-num))
(incf this-num))))
(when (location-in-list *default-breakpoint-debug-function* *breakpoints*
:function-end)
(format t "~&::FUNCTION-END *Active* "))))
(def-debug-command-alias "LL" "LIST-LOCATIONS")
;;; set breakpoint at # given
(def-debug-command "BREAKPOINT" ()
(let ((index (read-prompting-maybe "Location number, :start, or :end: "))
(break t)
(condition t)
(print nil)
(print-functions nil)
(function nil)
(bp)
(place *default-breakpoint-debug-function*))
(flet ((get-command-line ()
(let ((command-line nil)
(unique '(nil)))
(loop
(let ((next-input (read-if-available unique)))
(when (eq next-input unique) (return))
(push next-input command-line)))
(nreverse command-line)))
(set-vars-from-command-line (command-line)
(do ((arg (pop command-line) (pop command-line)))
((not arg))
(ecase arg
(:condition (setf condition (pop command-line)))
(:print (push (pop command-line) print))
(:break (setf break (pop command-line)))
(:function
(setf function (eval (pop command-line)))
(setf *default-breakpoint-debug-function*
(di:function-debug-function function))
(setf *possible-breakpoints*
(possible-breakpoints
*default-breakpoint-debug-function*))))))
(setup-function-start ()
:kind :function-start))
(setf break (di:preprocess-for-eval break code-loc))
(push (cons (di:preprocess-for-eval form code-loc) form)
print-functions))))
(setup-function-end ()
(setf bp
(di:make-breakpoint #'main-hook-function place
:kind :function-end))
(setf break
(coerce `(lambda (dummy)
(declare (ignore dummy)) ,break)
'function))
(setf condition (coerce `(lambda (dummy)
(declare (ignore dummy)) ,condition)
'function))
(dolist (form print)
(push (cons
(coerce `(lambda (dummy)
(declare (ignore dummy)) ,form) 'function)
form)
print-functions)))
(setup-code-location ()
(setf place (nth index *possible-breakpoints*))
(setf bp (di:make-breakpoint #'main-hook-function place
:kind :code-location))
(dolist (form print)
(push (cons
(di:preprocess-for-eval form place)
form)
print-functions))
(setf break (di:preprocess-for-eval break place))
(setf condition (di:preprocess-for-eval condition place))))
(set-vars-from-command-line (get-command-line))
(cond
((or (eq index :start) (eq index :s))
(setup-function-start))
((or (eq index :end) (eq index :e))
(setup-function-end))
(t
(setup-code-location)))
(di:activate-breakpoint bp)
(let* ((new-bp-info (create-breakpoint-info place bp index
:break break
:print print-functions
:condition condition))
(when old-bp-info
(di:deactivate-breakpoint (breakpoint-info-breakpoint old-bp-info))
(setf *breakpoints* (remove old-bp-info *breakpoints*))
(format t "Note: previous breakpoint removed.~%"))
(push new-bp-info *breakpoints*))
(print-breakpoint-info (first *breakpoints*))
(format t "~&Added."))))
(def-debug-command-alias "BP" "BREAKPOINT")
;;; list all breakpoints set
(def-debug-command "LIST-BREAKPOINTS" ()
(setf *breakpoints*
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
(sort *breakpoints* #'< :key #'breakpoint-info-breakpoint-number))
(dolist (info *breakpoints*)
(print-breakpoint-info info)))
(def-debug-command-alias "LB" "LIST-BREAKPOINTS")
(def-debug-command-alias "LBP" "LIST-BREAKPOINTS")
;;; remove breakpoint n or all if none given
(def-debug-command "DELETE-BREAKPOINT" ()
(let* ((index (read-if-available nil))
(bp-info
(find index *breakpoints* :key #'breakpoint-info-breakpoint-number)))
(cond (bp-info
(di:delete-breakpoint (breakpoint-info-breakpoint bp-info))
(setf *breakpoints* (remove bp-info *breakpoints*))
(format t "Breakpoint ~S removed.~%" index))
(index (format t "Breakpoint doesn't exist."))
(t
(dolist (ele *breakpoints*)
(di:delete-breakpoint (breakpoint-info-breakpoint ele)))
(setf *breakpoints* nil)
(format t "All breakpoints deleted.~%")))))
(def-debug-command-alias "DBP" "DELETE-BREAKPOINT")
;;;
;;; Miscellaneous commands.
;;;
(def-debug-command "FLUSH-ERRORS" ()
(if (setf *flush-debug-errors* (not *flush-debug-errors*))
(write-line "Errors now flushed.")
(write-line "Errors now create nested debug levels.")))
(def-debug-command "DESCRIBE" ()
(let* ((curloc (di:frame-code-location *current-frame*))
(debug-fun (di:code-location-debug-function curloc))
(function (di:debug-function-function debug-fun)))
(if function
(describe function)
(format t "Can't figure out the function for this frame."))))
;;;
;;; Editor commands.
;;;
(def-debug-command "EDIT-SOURCE" ()
(unless (typep *terminal-io* 'ed::ts-stream)
(error "The debugger's EDIT-SOURCE command only works in slave Lisps ~
connected to a Hemlock editor."))
(let* ((wire (ed::ts-stream-wire *terminal-io*))
(location (maybe-block-start-location
(di:frame-code-location *current-frame*)))
(d-source (di:code-location-debug-source location))
(name (di:debug-source-name d-source)))
(ecase (di:debug-source-from d-source)
(:file
(let* ((tlf-offset (di:code-location-top-level-form-offset location))
(local-tlf-offset (- tlf-offset
(di:debug-source-root-number d-source)))
(char-offset (aref (or (di:debug-source-start-positions d-source)
(error "No start positions map."))
local-tlf-offset)))
(wire:remote wire
(ed::edit-source-location (namestring name)
(di:debug-source-created d-source)
tlf-offset local-tlf-offset char-offset
(di:code-location-form-number location)))
(wire:wire-force-output wire)))
((:lisp :stream)
(wire:remote wire
(ed::cannot-edit-source-location))
(wire:wire-force-output wire)))))
;;;; Debug loop command utilities.
(defun read-prompting-maybe (prompt &optional (in *standard-input*)
(out *standard-output*))
(unless (ext:listen-skip-whitespace in)
(princ prompt out)
(force-output out))
(read in))
(defun read-if-available (default &optional (stream *standard-input*))
(if (ext:listen-skip-whitespace stream)
(read stream)
default))