PRINT, P displays current function call.
SOURCE [n] displays frame's source form with n levels of enclosing forms.
-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.
+Stepping:
+ STEP
+ [EXPERIMENTAL] Selects the CONTINUE restart if one exists and starts
+ single-stepping. Single stepping affects only code compiled with
+ under high DEBUG optimization quality. See User Manul for details.
Function and macro commands:
(SB-DEBUG:ARG n)
useful when the debugger was invoked to handle an error in
deeply nested input syntax, and now the reader is confused.)")
\f
-;;; This is used to communicate to DEBUG-LOOP that we are at a step breakpoint.
-(define-condition step-condition (simple-condition) ())
-\f
-;;;; breakpoint state
-
-(defvar *only-block-start-locations* nil
- #!+sb-doc
- "When true, the LIST-LOCATIONS command only displays block start locations.
- Otherwise, all locations are displayed.")
-
-(defvar *print-location-kind* nil
- #!+sb-doc
- "When 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 should not be listed when listing breakpoints
-(defvar *bad-code-location-types* '(:call-site :internal-error))
-(declaim (type list *bad-code-location-types*))
-
-;;; code locations of the possible breakpoints
-(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*))
-
-;;; the number of times left to step
-(defvar *number-of-steps* 1)
-(declaim (type integer *number-of-steps*))
-
-;;; This is used when listing and setting breakpoints.
-(defvar *default-breakpoint-debug-fun* nil)
-(declaim (type (or list sb!di:debug-fun) *default-breakpoint-debug-fun*))
-\f
-;;;; code location utilities
-
-;;; Return the first code-location in the passed debug block.
-(defun first-code-location (debug-block)
- (let ((found nil)
- (first-code-location nil))
- (sb!di:do-debug-block-locations (code-location debug-block)
- (unless found
- (setf first-code-location code-location)
- (setf found t)))
- first-code-location))
-
-;;; Return a list of the next code-locations following the one passed.
-;;; One of the *BAD-CODE-LOCATION-TYPES* will not be returned.
-(defun next-code-locations (code-location)
- (let ((debug-block (sb!di:code-location-debug-block code-location))
- (block-code-locations nil))
- (sb!di:do-debug-block-locations (block-code-location debug-block)
- (unless (member (sb!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 #'sb!di:code-location=)))
- (next-list (cond (code-loc-list
- (list (first code-loc-list)))
- ((map 'list #'first-code-location
- (sb!di:debug-block-successors debug-block)))
- (t nil))))
- (when (and (= (length next-list) 1)
- (sb!di:code-location= (first next-list) code-location))
- (setf next-list (next-code-locations (first next-list))))
- next-list)))
-
-;;; Return a list of code-locations of the possible breakpoints of DEBUG-FUN.
-(defun possible-breakpoints (debug-fun)
- (let ((possible-breakpoints nil))
- (sb!di:do-debug-fun-blocks (debug-block debug-fun)
- (unless (sb!di:debug-block-elsewhere-p debug-block)
- (if *only-block-start-locations*
- (push (first-code-location debug-block) possible-breakpoints)
- (sb!di:do-debug-block-locations (code-location debug-block)
- (when (not (member (sb!di:code-location-kind code-location)
- *bad-code-location-types*))
- (push code-location possible-breakpoints))))))
- (nreverse possible-breakpoints)))
-
-;;; Search the info-list for the item passed (CODE-LOCATION,
-;;; DEBUG-FUN, 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 (sb!di:breakpoint-kind (breakpoint-info-breakpoint place)))
- (setf place (breakpoint-info-place place)))
- (cond ((sb!di:code-location-p place)
- (find place info-list
- :key #'breakpoint-info-place
- :test (lambda (x y) (and (sb!di:code-location-p y)
- (sb!di:code-location= x y)))))
- (t
- (find place info-list
- :test (lambda (x-debug-fun y-info)
- (let ((y-place (breakpoint-info-place y-info))
- (y-breakpoint (breakpoint-info-breakpoint
- y-info)))
- (and (sb!di:debug-fun-p y-place)
- (eq x-debug-fun y-place)
- (or (not kind)
- (eq kind (sb!di:breakpoint-kind
- y-breakpoint))))))))))
;;; If LOC is an unknown location, then try to find the block start
;;; location. Used by source printing to some information instead of
loc)))
loc))
\f
-;;;; the BREAKPOINT-INFO structure
-
-;;; info about a made breakpoint
-(defstruct (breakpoint-info (:copier nil)
- (:constructor %make-breakpoint-info))
- ;; where we are going to stop
- (place (missing-arg)
- :type (or sb!di:code-location sb!di:debug-fun)
- :read-only t)
- ;; the breakpoint returned by SB!DI:MAKE-BREAKPOINT
- (breakpoint (missing-arg) :type sb!di:breakpoint :read-only t)
- ;; the function returned from SB!DI:PREPROCESS-FOR-EVAL. If result is
- ;; non-NIL, drop into the debugger.
- (break #'identity :type function :read-only t)
- ;; the function returned from SB!DI:PREPROCESS-FOR-EVAL. If result is
- ;; non-NIL, eval (each) print and print results.
- (condition #'identity :type function :read-only t)
- ;; the list of functions from SB!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 :read-only t)
- ;; the number used when listing the possible breakpoints within a
- ;; function; or could also be a symbol such as START or END
- (code-location-selector (missing-arg) :type (or symbol integer) :read-only t)
- ;; the number used when listing the active breakpoints, and when
- ;; deleting breakpoints
- (breakpoint-number (missing-arg) :type integer :read-only t))
-
-(defun create-breakpoint-info (place breakpoint code-location-selector
- &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-selector code-location-selector
- :breakpoint-number breakpoint-number
- :break break
- :condition condition
- :print print)))
-
-(defun print-breakpoint-info (breakpoint-info)
- (let ((place (breakpoint-info-place breakpoint-info))
- (bp-number (breakpoint-info-breakpoint-number breakpoint-info)))
- (case (sb!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
- (breakpoint-info-code-location-selector breakpoint-info)
- (sb!di:debug-fun-name (sb!di:code-location-debug-fun place))))
- (:fun-start
- (format t "~&~S: FUN-START in ~S" bp-number
- (sb!di:debug-fun-name place)))
- (:fun-end
- (format t "~&~S: FUN-END in ~S" bp-number
- (sb!di:debug-fun-name place))))))
-\f
-;;;; MAIN-HOOK-FUN for steps and breakpoints
-
-;;; This must be passed as the hook function. It keeps track of where
-;;; STEP breakpoints are.
-(defun main-hook-fun (current-frame breakpoint &optional return-vals
- fun-end-cookie)
- (setf *default-breakpoint-debug-fun*
- (sb!di:frame-debug-fun current-frame))
- (dolist (step-info *step-breakpoints*)
- (sb!di:delete-breakpoint (breakpoint-info-breakpoint step-info))
- (let ((bp-info (location-in-list step-info *breakpoints*)))
- (when bp-info
- (sb!di:activate-breakpoint (breakpoint-info-breakpoint bp-info)))))
- (let ((*stack-top-hint* current-frame)
- (step-hit-info
- (location-in-list (sb!di:breakpoint-what breakpoint)
- *step-breakpoints*
- (sb!di:breakpoint-kind breakpoint)))
- (bp-hit-info
- (location-in-list (sb!di:breakpoint-what breakpoint)
- *breakpoints*
- (sb!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 fun-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*)
- (set-step-breakpoint 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*)
- (set-step-breakpoint 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 "unknown breakpoint"))))))
-\f
-;;; Set 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 set-step-breakpoint (frame)
- (cond
- ((sb!di:debug-block-elsewhere-p (sb!di:code-location-debug-block
- (sb!di:frame-code-location frame)))
- ;; FIXME: FORMAT T is used for error output here and elsewhere in
- ;; the debug code.
- (format t "cannot step, in elsewhere code~%"))
- (t
- (let* ((code-location (sb!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
- (sb!di:deactivate-breakpoint (breakpoint-info-breakpoint
- bp-info))))
- (let ((bp (sb!di:make-breakpoint #'main-hook-fun code-location
- :kind :code-location)))
- (sb!di:activate-breakpoint bp)
- (push (create-breakpoint-info code-location bp 0)
- *step-breakpoints*))))
- (t
- (let* ((debug-fun (sb!di:frame-debug-fun *current-frame*))
- (bp (sb!di:make-breakpoint #'main-hook-fun debug-fun
- :kind :fun-end)))
- (sb!di:activate-breakpoint bp)
- (push (create-breakpoint-info debug-fun bp 0)
- *step-breakpoints*))))))))
-\f
-;;;; STEP
-
-;;; ANSI specifies that this macro shall exist, even if only as a
-;;; trivial placeholder like this.
-(defmacro step (form)
- "This is a trivial placeholder implementation of the CL:STEP macro required
- by the ANSI spec, simply expanding to `(LET () ,FORM). A more featureful
- version would be welcome, we just haven't written it."
- `(let ()
- ,form))
-\f
;;;; BACKTRACE
(defun backtrace (&optional (count most-positive-fixnum)
(svref translations form-num)
context)))))
\f
-;;; breakpoint and step commands
-
-;;; Step to the next code-location.
+;;; step to the next steppable form
(!def-debug-command "STEP" ()
- (setf *number-of-steps* (read-if-available 1))
- (set-step-breakpoint *current-frame*)
- (continue *debug-condition*)
- (error "couldn't continue"))
-
-;;; List possible breakpoint locations, which ones are active, and
-;;; where the CONTINUE restart will transfer control. Set
-;;; *POSSIBLE-BREAKPOINTS* to the code-locations which can then be
-;;; used by sbreakpoint.
-(!def-debug-command "LIST-LOCATIONS" ()
- (let ((df (read-if-available *default-breakpoint-debug-fun*)))
- (cond ((consp df)
- (setf df (sb!di:fun-debug-fun (eval df)))
- (setf *default-breakpoint-debug-fun* df))
- ((or (eq ':c df)
- (not *default-breakpoint-debug-fun*))
- (setf df (sb!di:frame-debug-fun *current-frame*))
- (setf *default-breakpoint-debug-fun* df)))
- (setf *possible-breakpoints* (possible-breakpoints df)))
- (let ((continue-at (sb!di:frame-code-location *current-frame*)))
- (let ((active (location-in-list *default-breakpoint-debug-fun*
- *breakpoints* :fun-start))
- (here (sb!di:code-location=
- (sb!di:debug-fun-start-location
- *default-breakpoint-debug-fun*) continue-at)))
- (when (or active here)
- (format t "::FUN-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 "~&~W: " prev-num)
- (format t "~&~W-~W: " prev-num this-num)))
- (print-code-location-source-form prev-location 0)
- (when *print-location-kind*
- (format t "~S " (sb!di:code-location-kind prev-location)))
- (when (location-in-list prev-location *breakpoints*)
- (format t " *Active*"))
- (when (sb!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*)
- (sb!di:code-location= code-location continue-at)
- (not prev-location)
- (not (eq (sb!di:code-location-debug-source code-location)
- (sb!di:code-location-debug-source prev-location)))
- (not (eq (sb!di:code-location-toplevel-form-offset
- code-location)
- (sb!di:code-location-toplevel-form-offset
- prev-location)))
- (not (eq (sb!di:code-location-form-number code-location)
- (sb!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-fun*
- *breakpoints*
- :fun-end)
- (format t "~&::FUN-END *Active* "))))
-
-(!def-debug-command-alias "LL" "LIST-LOCATIONS")
-
-;;; Set breakpoint at the given number.
-(!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-fun*))
- (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-fun*
- (sb!di:fun-debug-fun function))
- (setf place *default-breakpoint-debug-fun*)
- (setf *possible-breakpoints*
- (possible-breakpoints
- *default-breakpoint-debug-fun*))))))
- (setup-fun-start ()
- (let ((code-loc (sb!di:debug-fun-start-location place)))
- (setf bp (sb!di:make-breakpoint #'main-hook-fun
- place
- :kind :fun-start))
- (setf break (sb!di:preprocess-for-eval break code-loc))
- (setf condition (sb!di:preprocess-for-eval condition code-loc))
- (dolist (form print)
- (push (cons (sb!di:preprocess-for-eval form code-loc) form)
- print-functions))))
- (setup-fun-end ()
- (setf bp
- (sb!di:make-breakpoint #'main-hook-fun
- place
- :kind :fun-end))
- (setf break
- ;; FIXME: These and any other old (COERCE `(LAMBDA ..) ..)
- ;; forms should be converted to shiny new (LAMBDA ..) forms.
- ;; (Search the sources for "coerce.*\(lambda".)
- (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 (sb!di:make-breakpoint #'main-hook-fun place
- :kind :code-location))
- (dolist (form print)
- (push (cons
- (sb!di:preprocess-for-eval form place)
- form)
- print-functions))
- (setf break (sb!di:preprocess-for-eval break place))
- (setf condition (sb!di:preprocess-for-eval condition place))))
- (set-vars-from-command-line (get-command-line))
- (cond
- ((or (eq index :start) (eq index :s))
- (setup-fun-start))
- ((or (eq index :end) (eq index :e))
- (setup-fun-end))
- (t
- (setup-code-location)))
- (sb!di:activate-breakpoint bp)
- (let* ((new-bp-info (create-breakpoint-info place bp index
- :break break
- :print print-functions
- :condition condition))
- (old-bp-info (location-in-list new-bp-info *breakpoints*)))
- (when old-bp-info
- (sb!di:deactivate-breakpoint (breakpoint-info-breakpoint
- old-bp-info))
- (setf *breakpoints* (remove old-bp-info *breakpoints*))
- (format t "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 which are set.
-(!def-debug-command "LIST-BREAKPOINTS" ()
- (setf *breakpoints*
- (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 remove all breakpoints if no N 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
- (sb!di:delete-breakpoint (breakpoint-info-breakpoint bp-info))
- (setf *breakpoints* (remove bp-info *breakpoints*))
- (format t "breakpoint ~S removed~%" index))
- (index (format t "The breakpoint doesn't exist."))
+ (let ((restart (find-restart 'continue *debug-condition*)))
+ (cond (restart
+ (setf *stepping* t
+ *step* t)
+ (invoke-restart restart))
(t
- (dolist (ele *breakpoints*)
- (sb!di:delete-breakpoint (breakpoint-info-breakpoint ele)))
- (setf *breakpoints* nil)
- (format t "all breakpoints deleted~%")))))
+ (format *debug-io* "~&Non-continuable error, cannot step.~%")))))
-(!def-debug-command-alias "DBP" "DELETE-BREAKPOINT")
-\f
;;; miscellaneous commands
(!def-debug-command "DESCRIBE" ()
projects / sbcl.git / blobdiff