Newer
Older
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))
(let* ((name
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(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, or it is nil).
(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))))
;;
;; Use %Invoke-Restart-Interactively because the dynamic
;; environment when the debugger invokes the restart can be
;; different from the dynamic environment when the debugger
;; computes active restarts. If this is the case,
;; Invoke-Restart-Interactively might find that the restart
;; being invoked is not currently active and signal a
;; Control-Error.
(let ((restart-fun
(lambda ()
(conditions::%invoke-restart-interactively restart))))
(push (cons (format nil "~d" num) restart-fun) commands)
(unless (or (null (restart-name restart))
(find name commands :key #'car :test #'string=))
(push (cons name 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.")))))
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(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~%" (safe-condition-message *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 "~S~:[#~D~;~*~] = ~S~%"
(di:debug-variable-symbol 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)
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(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*))
;;; To suppress the read-time evaluation #. macro during source read
;;; the *readtable* is modified. The *readtable* is cached to avoid
;;; copying it each time, and invalidated when the
;;; *cached-debug-source* has changed.
(defvar *cached-readtable* nil)
(declaim (type (or readtable null) *cached-readtable*))
(pushnew #'(lambda ()
(setq *cached-debug-source* nil *cached-source-stream* nil
*cached-readtable* nil))
;;; 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))))))
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;;; 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)))
(setq *cached-readtable* nil)
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(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*)))))
(unless *cached-readtable*
(setq *cached-readtable* (copy-readtable))
(set-dispatch-macro-character
#\# #\.
#'(lambda (stream sub-char &rest rest)
(declare (ignore rest sub-char))
(let ((token (read stream t nil t)))
(format nil "#.~s" token)))
*cached-readtable*))
(let ((*readtable* *cached-readtable*))
(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))
(set-step-breakpoint *current-frame*)
(continue *debug-condition*)
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(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*
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(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 (ed::ts-stream-p *terminal-io*)
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(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))