X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fcode%2Fdebug.lisp;h=19f3896848b8f73aa50165950015d7025e5322f6;hb=755ff8f53315160fcb2d92207dfe24ae7ed4d4c6;hp=422b573a742154f4e96e81a43f93f2fa3f5c1550;hpb=e02c32bd4d07a7d30c9a9d78be54f1f9f84f9877;p=sbcl.git diff --git a/src/code/debug.lisp b/src/code/debug.lisp index 422b573..19f3896 100644 --- a/src/code/debug.lisp +++ b/src/code/debug.lisp @@ -13,19 +13,36 @@ ;;;; variables and constants -(defvar *debug-print-level* 3 +;;; things to consider when tweaking these values: +;;; * We're afraid to just default them to NIL and NIL, in case the +;;; user inadvertently causes a hairy data structure to be printed +;;; when he inadvertently enters the debugger. +;;; * We don't want to truncate output too much. These days anyone +;;; can easily run their Lisp in a windowing system or under Emacs, +;;; so it's not the end of the world even if the worst case is a +;;; few thousand lines of output. +;;; * As condition :REPORT methods are converted to use the pretty +;;; printer, they acquire *PRINT-LEVEL* constraints, so e.g. under +;;; sbcl-0.7.1.28's old value of *DEBUG-PRINT-LEVEL*=3, an +;;; ARG-COUNT-ERROR printed as +;;; error while parsing arguments to DESTRUCTURING-BIND: +;;; invalid number of elements in +;;; # +;;; to satisfy lambda list +;;; #: +;;; exactly 2 expected, but 5 found +(defvar *debug-print-level* 5 #!+sb-doc "*PRINT-LEVEL* for the debugger") - -(defvar *debug-print-length* 5 +(defvar *debug-print-length* 7 #!+sb-doc "*PRINT-LENGTH* for the debugger") (defvar *debug-readtable* - ;; KLUDGE: This can't be initialized in a cold toplevel form, because the - ;; *STANDARD-READTABLE* isn't initialized until after cold toplevel forms - ;; have run. So instead we initialize it immediately after - ;; *STANDARD-READTABLE*. -- WHN 20000205 + ;; KLUDGE: This can't be initialized in a cold toplevel form, + ;; because the *STANDARD-READTABLE* isn't initialized until after + ;; cold toplevel forms have run. So instead we initialize it + ;; immediately after *STANDARD-READTABLE*. -- WHN 20000205 nil #!+sb-doc "*READTABLE* for the debugger") @@ -34,57 +51,55 @@ #!+sb-doc "This is T while in the debugger.") -(defvar *debug-command-level* 0 - #!+sb-doc - "Pushes and pops/exits inside the debugger change this.") +;;; nestedness inside debugger command loops +(defvar *debug-command-level* 0) + +;;; If this is bound before the debugger is invoked, it is used as the +;;; stack top by the debugger. +(defvar *stack-top-hint* nil) -(defvar *stack-top-hint* nil - #!+sb-doc - "If this is bound before the debugger is invoked, it is used as the stack - top by the debugger.") (defvar *stack-top* nil) (defvar *real-stack-top* nil) (defvar *current-frame* nil) -;;; the default for *DEBUG-PROMPT* -(defun debug-prompt () - (let ((*standard-output* *debug-io*)) - (terpri) - (prin1 (sb!di:frame-number *current-frame*)) - (dotimes (i *debug-command-level*) (princ "]")) - (princ " ") - (force-output))) - -(defparameter *debug-prompt* #'debug-prompt - #!+sb-doc - "a function of no arguments that prints the debugger prompt on *DEBUG-IO*") - +;;; Beginner-oriented help messages are important because you end up +;;; in the debugger whenever something bad happens, or if you try to +;;; get out of the system with Ctrl-C or (EXIT) or EXIT or whatever. +;;; But after memorizing them the wasted screen space gets annoying.. +(defvar *debug-beginner-help-p* t + "Should the debugger display beginner-oriented help messages?") + +(defun debug-prompt (stream) + (format stream + "~%~W~:[~;[~W~]] " + (sb!di:frame-number *current-frame*) + (> *debug-command-level* 1) + *debug-command-level*)) + (defparameter *debug-help-string* -"The prompt is right square brackets, the number indicating how many - recursive command loops you are in. -Any command may be uniquely abbreviated. +"The prompt is square brackets, with number(s) indicating the current control + stack level and, if you've entered the debugger recursively, how deeply + recursed you are. +Any command -- including the name of a restart -- may be uniquely abbreviated. The debugger rebinds various special variables for controlling i/o, sometimes to defaults (much like WITH-STANDARD-IO-SYNTAX does) and sometimes to its own special values, e.g. SB-DEBUG:*DEBUG-PRINT-LEVEL*. -Debug commands do not affect * and friends, but evaluation in the debug loop - do affect these variables. +Debug commands do not affect *, //, and similar variables, but evaluation in + the debug loop does affect these variables. SB-DEBUG:*FLUSH-DEBUG-ERRORS* controls whether errors at the debug prompt - drop you into deeper into the debugger. + drop you deeper into the debugger. Getting in and out of the debugger: - 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. - - The name of any restart, or its number, is a valid command, and is the same - as using RESTART to invoke that restart. + The number of any restart, or its name, or a unique abbreviation for its + name, 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 frame n + U up frame D down frame + B bottom frame F n frame n (n=0 for top frame) Inspecting frames: BACKTRACE [n] shows n frames going down the stack. @@ -93,8 +108,8 @@ Inspecting frames: 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. + 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 @@ -112,7 +127,12 @@ Function and macro commands: (SB-DEBUG:ARG n) Return the n'th argument in the current frame. (SB-DEBUG:VAR string-or-symbol [id]) - Returns the value of the specified variable in the current frame.") + Returns the value of the specified variable in the current frame. + +Other commands: + SLURP Discard all pending input on *STANDARD-INPUT*. (This can be + useful when the debugger was invoked to handle an error in + deeply nested input syntax, and now the reader is confused.)") ;;; This is used to communicate to DEBUG-LOOP that we are at a step breakpoint. (define-condition step-condition (simple-condition) ()) @@ -128,8 +148,8 @@ Function and macro commands: #!+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 +;;; 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*)) @@ -137,12 +157,12 @@ Function and macro commands: (defvar *possible-breakpoints*) (declaim (type list *possible-breakpoints*)) -;;; a list of the made and active breakpoints, each is a breakpoint-info -;;; structure +;;; 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 +;;; a list of BREAKPOINT-INFO structures of the made and active step ;;; breakpoints (defvar *step-breakpoints* nil) (declaim (type list *step-breakpoints*)) @@ -152,8 +172,8 @@ Function and macro commands: (declaim (type integer *number-of-steps*)) ;;; This is used when listing and setting breakpoints. -(defvar *default-breakpoint-debug-function* nil) -(declaim (type (or list sb!di:debug-function) *default-breakpoint-debug-function*)) +(defvar *default-breakpoint-debug-fun* nil) +(declaim (type (or list sb!di:debug-fun) *default-breakpoint-debug-fun*)) ;;;; code location utilities @@ -167,8 +187,8 @@ Function and macro commands: (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. +;;; 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)) @@ -189,11 +209,10 @@ Function and macro commands: (setf next-list (next-code-locations (first next-list)))) next-list))) -;;; Returns a list of code-locations of the possible breakpoints of the -;;; debug-function passed. -(defun possible-breakpoints (debug-function) +;;; 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-function-blocks (debug-block debug-function) + (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) @@ -203,11 +222,11 @@ Function and macro commands: (push code-location possible-breakpoints)))))) (nreverse possible-breakpoints))) -;;; 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. +;;; 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))) @@ -215,22 +234,23 @@ Function and macro commands: (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))))) + :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-function y-info) - (let ((y-place (breakpoint-info-place y-info)) - (y-breakpoint (breakpoint-info-breakpoint - y-info))) - (and (sb!di:debug-function-p y-place) - (eq x-debug-function 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 none for the user. + :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 +;;; none for the user. (defun maybe-block-start-location (loc) (if (sb!di:code-location-unknown-p loc) (let* ((block (sb!di:code-location-debug-block loc)) @@ -248,31 +268,32 @@ Function and macro commands: ;;;; the BREAKPOINT-INFO structure ;;; info about a made breakpoint -(defstruct breakpoint-info +(defstruct (breakpoint-info (:copier nil) + (:constructor %make-breakpoint-info)) ;; where we are going to stop - (place (required-argument) - :type (or sb!di:code-location sb!di:debug-function)) - ;; the breakpoint returned by sb!di:make-breakpoint - (breakpoint (required-argument) :type sb!di:breakpoint) - ;; the function returned from sb!di:preprocess-for-eval. If result is + (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) - ;; the function returned from sb!di:preprocess-for-eval. If result is + (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) - ;; 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) - ;; 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)) - -;;; Return a new BREAKPOINT-INFO structure with the info passed. -(defun create-breakpoint-info (place breakpoint code-location-number + (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* @@ -284,40 +305,40 @@ Function and macro commands: (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))) + (%make-breakpoint-info :place place + :breakpoint breakpoint + :code-location-selector code-location-selector + :breakpoint-number breakpoint-number + :break break + :condition condition + :print print))) -;;; Print 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))) + (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 - loc-number - (sb!di:debug-function-name (sb!di:code-location-debug-function - place)))) - (:function-start - (format t "~&~S: FUNCTION-START in ~S" bp-number - (sb!di:debug-function-name place))) - (:function-end - (format t "~&~S: FUNCTION-END in ~S" bp-number - (sb!di:debug-function-name place)))))) + (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)))))) -;;;; MAIN-HOOK-FUNCTION for steps and breakpoints - -;;; This must be passed as the hook function. It 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* - (sb!di:frame-debug-function current-frame)) +;;;; 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*))) @@ -341,7 +362,7 @@ Function and macro commands: (print-common-info () (build-string (with-output-to-string (*standard-output*) - (when function-end-cookie + (when fun-end-cookie (format t "~%Return values: ~S" return-vals)) (when condition (when (breakpoint-info-print bp-hit-info) @@ -382,7 +403,7 @@ Function and macro commands: (break string) (format t "~A" string))) (t - (break "error in main-hook-function: unknown breakpoint")))))) + (break "unknown breakpoint")))))) ;;; Set breakpoints at the next possible code-locations. After calling ;;; this, either (CONTINUE) if in the debugger or just let program flow @@ -404,17 +425,17 @@ Function and macro commands: (when bp-info (sb!di:deactivate-breakpoint (breakpoint-info-breakpoint bp-info)))) - (let ((bp (sb!di:make-breakpoint #'main-hook-function code-location + (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-function (sb!di:frame-debug-function *current-frame*)) - (bp (sb!di:make-breakpoint #'main-hook-function debug-function - :kind :function-end))) + (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-function bp 0) + (push (create-breakpoint-info debug-fun bp 0) *step-breakpoints*)))))))) ;;;; STEP @@ -433,7 +454,7 @@ Function and macro commands: (*standard-output* *debug-io*)) #!+sb-doc "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 + debugger, the current frame is indicated by the prompt. COUNT is how many frames to show." (fresh-line *standard-output*) (do ((frame (if *in-the-debugger* *current-frame* (sb!di:top-frame)) @@ -448,8 +469,8 @@ Function and macro commands: (eval-when (:compile-toplevel :execute) -;;; This is a convenient way to express what to do for each type of lambda-list -;;; element. +;;; This is a convenient way to express what to do for each type of +;;; lambda-list element. (sb!xc:defmacro lambda-list-element-dispatch (element &key required @@ -466,7 +487,7 @@ Function and macro commands: (:rest ,@rest) (:keyword ,@keyword))) (symbol - (assert (eq ,element :deleted)) + (aver (eq ,element :deleted)) ,@deleted))) (sb!xc:defmacro lambda-var-dispatch (variable location deleted valid other) @@ -480,49 +501,66 @@ Function and macro commands: ) ; 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. +;;; the arg list is unavailable, some arg is unavailable or unused, etc. (defstruct (unprintable-object (:constructor make-unprintable-object (string)) (:print-object (lambda (x s) - (print-unreadable-object (x s :type t) + (print-unreadable-object (x s) (write-string (unprintable-object-string x) - s))))) + s)))) + (:copier nil)) string) -;;; Print frame with verbosity level 1. If we hit a rest-arg, then +;;; Print FRAME with verbosity level 1. If we hit a &REST arg, then ;;; print as many of the values as possible, punting the loop over ;;; lambda-list variables since any other arguments will be in the -;;; rest-arg's list of values. +;;; &REST arg's list of values. (defun print-frame-call-1 (frame) - (let* ((d-fun (sb!di:frame-debug-function frame)) - (loc (sb!di:frame-code-location frame)) - (results (list (sb!di:debug-function-name d-fun)))) + (let ((debug-fun (sb!di:frame-debug-fun frame)) + (loc (sb!di:frame-code-location frame)) + (reversed-args nil)) + + ;; Construct function arguments in REVERSED-ARGS. (handler-case - (dolist (ele (sb!di:debug-function-lambda-list d-fun)) + (dolist (ele (sb!di:debug-fun-lambda-list debug-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)) + :required ((push (frame-call-arg ele loc frame) reversed-args)) + :optional ((push (frame-call-arg (second ele) loc frame) + reversed-args)) + :keyword ((push (second ele) reversed-args) + (push (frame-call-arg (third ele) loc frame) + reversed-args)) + :deleted ((push (frame-call-arg ele loc frame) reversed-args)) :rest ((lambda-var-dispatch (second ele) loc nil (progn - (setf results + (setf reversed-args (append (reverse (sb!di:debug-var-value (second ele) frame)) - results)) + reversed-args)) (return)) - (push (make-unprintable-object "unavailable &REST arg") - results))))) + (push (make-unprintable-object + "unavailable &REST argument") + reversed-args))))) (sb!di:lambda-list-unavailable () - (push (make-unprintable-object "lambda list unavailable") results))) - (prin1 (mapcar #'ensure-printable-object (nreverse results))) - (when (sb!di:debug-function-kind d-fun) + (push (make-unprintable-object "lambda list unavailable") + reversed-args))) + + (pprint-logical-block (*standard-output* nil :prefix "(" :suffix ")") + (let ((args (nreverse (mapcar #'ensure-printable-object reversed-args)))) + ;; Since we go to some trouble to make nice informative function + ;; names like (PRINT-OBJECT :AROUND (CLOWN T)), let's make sure + ;; that they aren't truncated by *PRINT-LENGTH* and *PRINT-LEVEL*. + (let ((*print-length* nil) + (*print-level* nil)) + (prin1 (ensure-printable-object (sb!di:debug-fun-name debug-fun)))) + ;; For the function arguments, we can just print normally. + (format t "~{ ~_~S~}" args))) + + (when (sb!di:debug-fun-kind debug-fun) (write-char #\[) - (prin1 (sb!di:debug-function-kind d-fun)) + (prin1 (sb!di:debug-fun-kind debug-fun)) (write-char #\])))) (defun ensure-printable-object (object) @@ -536,13 +574,13 @@ Function and macro commands: (defun frame-call-arg (var location frame) (lambda-var-dispatch var location - (make-unprintable-object "unused arg") + (make-unprintable-object "unused argument") (sb!di:debug-var-value var frame) - (make-unprintable-object "unavailable arg"))) + (make-unprintable-object "unavailable argument"))) -;;; 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 +;;; 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-FUN's name, and one ;;; indicates displaying call-like, one-liner format with argument ;;; values. (defun print-frame-call (frame &key (verbosity 1) (number nil)) @@ -578,18 +616,7 @@ Function and macro commands: ;;; These are bound on each invocation of INVOKE-DEBUGGER. (defvar *debug-restarts*) (defvar *debug-condition*) - -;;; Print *DEBUG-CONDITION*, taking care to avoid recursive invocation -;;; of the debugger in case of a problem (e.g. a bug in the PRINT-OBJECT -;;; method for *DEBUG-CONDITION*). -(defun princ-debug-condition-carefully (stream) - (handler-case (princ *debug-condition* stream) - (error (condition) - (format stream - " (caught ~S when trying to print ~S)" - (type-of condition) - '*debug-condition*))) - *debug-condition*) +(defvar *nested-debug-condition*) (defun invoke-debugger (condition) #!+sb-doc @@ -597,26 +624,32 @@ Function and macro commands: (let ((old-hook *debugger-hook*)) (when old-hook (let ((*debugger-hook* nil)) - (funcall hook condition hook)))) - (sb!unix:unix-sigsetmask 0) - (let ((original-package *package*)) ; protected from WITH-STANDARD-IO-SYNTAX + (funcall old-hook condition old-hook)))) + ;; FIXME: No-one seems to know what this is for. Nothing is noticeably + ;; broken on sunos... + #!-sunos (sb!unix:unix-sigsetmask 0) + + ;; Elsewhere in the system, we use the SANE-PACKAGE function for + ;; this, but here causing an exception just as we're trying to handle + ;; an exception would be confusing, so instead we use a special hack. + (unless (and (packagep *package*) + (package-name *package*)) + (setf *package* (find-package :cl-user)) + (format *error-output* + "The value of ~S was not an undeleted PACKAGE. It has been +reset to ~S." + '*package* *package*)) + (let (;; Save *PACKAGE* to protect it from WITH-STANDARD-IO-SYNTAX. + (original-package *package*)) (with-standard-io-syntax (let* ((*debug-condition* condition) (*debug-restarts* (compute-restarts condition)) - ;; FIXME: The next two bindings seem flaky, violating the - ;; principle of least surprise. But in order to fix them, - ;; we'd need to go through all the i/o statements in the - ;; debugger, since a lot of them do their thing on - ;; *STANDARD-INPUT* and *STANDARD-OUTPUT* instead of - ;; *DEBUG-IO*. - (*standard-input* *debug-io*) ; in case of setq - (*standard-output* *debug-io*) ; '' '' '' '' ;; We want the i/o subsystem to be in a known, useful ;; state, regardless of where the debugger was invoked in ;; the program. WITH-STANDARD-IO-SYNTAX does some of that, ;; but ;; 1. It doesn't affect our internal special variables - ;; like *CURRENT-LEVEL*. + ;; like *CURRENT-LEVEL-IN-PRINT*. ;; 2. It isn't customizable. ;; 3. It doesn't set *PRINT-READABLY* or *PRINT-PRETTY* ;; to the same value as the toplevel default. @@ -624,64 +657,124 @@ Function and macro commands: ;; helpful behavior for a debugger. ;; We try to remedy all these problems with explicit ;; rebindings here. - (sb!kernel:*current-level* 0) + (sb!kernel:*current-level-in-print* 0) (*print-length* *debug-print-length*) (*print-level* *debug-print-level*) (*readtable* *debug-readtable*) (*print-readably* nil) (*print-pretty* t) - (*package* original-package)) - #!+sb-show (sb!conditions::show-condition *debug-condition* - *error-output*) - (format *error-output* - "~2&debugger invoked on ~S of type ~S:~% " - '*debug-condition* - (type-of *debug-condition*)) - (princ-debug-condition-carefully *error-output*) - (terpri *error-output*) - (let (;; FIXME: like the bindings of *STANDARD-INPUT* and - ;; *STANDARD-OUTPUT* above.. + (*package* original-package) + (*nested-debug-condition* nil)) + + ;; Before we start our own output, finish any pending output. + ;; Otherwise, if the user tried to track the progress of + ;; his program using PRINT statements, he'd tend to lose + ;; the last line of output or so, and get confused. + (flush-standard-output-streams) + + ;; (The initial output here goes to *ERROR-OUTPUT*, because the + ;; initial output is not interactive, just an error message, + ;; and when people redirect *ERROR-OUTPUT*, they could + ;; reasonably expect to see error messages logged there, + ;; regardless of what the debugger does afterwards.) + (handler-case + (format *error-output* + "~2&~@~%" + (type-of *debug-condition*) + *debug-condition*) + (error (condition) + (setf *nested-debug-condition* condition) + (let ((ndc-type (type-of *nested-debug-condition*))) + (format *error-output* + "~&~@<(A ~S was caught when trying to print ~S when ~ + entering the debugger. Printing was aborted and the ~ + ~S was stored in ~S.)~@:>~%" + ndc-type + '*debug-condition* + ndc-type + '*nested-debug-condition*)) + (when (typep condition 'cell-error) + ;; what we really want to know when it's e.g. an UNBOUND-VARIABLE: + (format *error-output* + "~&(CELL-ERROR-NAME ~S) = ~S~%" + '*debug-condition* + (cell-error-name *debug-condition*))))) + + ;; After the initial error/condition/whatever announcement to + ;; *ERROR-OUTPUT*, we become interactive, and should talk on + ;; *DEBUG-IO* from now on. (KLUDGE: This is a normative + ;; statement, not a description of reality.:-| There's a lot of + ;; older debugger code which was written to do i/o on whatever + ;; stream was in fashion at the time, and not all of it has + ;; been converted to behave this way. -- WHN 2000-11-16) + (let (;; FIXME: Rebinding *STANDARD-OUTPUT* here seems wrong, + ;; violating the principle of least surprise, and making + ;; it impossible for the user to do reasonable things + ;; like using PRINT at the debugger prompt to send output + ;; to the program's ordinary (possibly + ;; redirected-to-a-file) *STANDARD-OUTPUT*. (CMU CL + ;; used to rebind *STANDARD-INPUT* here too, but that's + ;; been fixed already.) + (*standard-output* *debug-io*) + ;; This seems reasonable: e.g. if the user has redirected + ;; *ERROR-OUTPUT* to some log file, it's probably wrong + ;; to send errors which occur in interactive debugging to + ;; that file, and right to send them to *DEBUG-IO*. (*error-output* *debug-io*)) (unless (typep condition 'step-condition) - (show-restarts *debug-restarts* *error-output*)) + (when *debug-beginner-help-p* + (format *debug-io* + "~%~@~2%" + '*debug-condition* + '*debug-beginner-help-p*)) + (show-restarts *debug-restarts* *debug-io*)) (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))) - (when name - (let ((len (length (princ-to-string name)))) - (when (> len max-name-len) - (setf max-name-len len)))))) - (unless (zerop max-name-len) - (incf max-name-len 3)) - (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))))) - -;;; This calls DEBUG-LOOP, performing some simple initializations before doing -;;; so. INVOKE-DEBUGGER calls this to actually get into the debugger. -;;; SB!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 show-restarts (restarts s) + (cond ((null restarts) + (format s + "~&(no restarts: If you didn't do this on purpose, ~ + please report it as a bug.)~%")) + (t + (format s "~&restarts:~%") + (let ((count 0) + (names-used '(nil)) + (max-name-len 0)) + (dolist (restart restarts) + (let ((name (restart-name restart))) + (when name + (let ((len (length (princ-to-string name)))) + (when (> len max-name-len) + (setf max-name-len len)))))) + (unless (zerop max-name-len) + (incf max-name-len 3)) + (dolist (restart restarts) + (let ((name (restart-name restart))) + (cond ((member name names-used) + (format s "~& ~2D: ~V@T~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)))))) + +;;; This calls DEBUG-LOOP, performing some simple initializations +;;; before doing so. INVOKE-DEBUGGER calls this to actually get into +;;; the debugger. SB!KERNEL::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) - (clear-input *debug-io*) - (format *debug-io* - "~&Within the debugger, you can type HELP for help.~%")) + (clear-input *debug-io*)) #!-mp (debug-loop) #!+mp (sb!mp:without-scheduling (debug-loop)))) @@ -700,30 +793,36 @@ Function and macro commands: (*stack-top* (or *stack-top-hint* *real-stack-top*)) (*stack-top-hint* nil) (*current-frame* *stack-top*)) - (handler-bind ((sb!di:debug-condition (lambda (condition) - (princ condition *debug-io*) - (throw 'debug-loop-catcher nil)))) + (handler-bind ((sb!di:debug-condition + (lambda (condition) + (princ condition *debug-io*) + (/show0 "handling d-c by THROWing DEBUG-LOOP-CATCHER") + (throw 'debug-loop-catcher nil)))) (fresh-line) (print-frame-call *current-frame* :verbosity 2) (loop (catch 'debug-loop-catcher - (handler-bind ((error #'(lambda (condition) - (when *flush-debug-errors* - (clear-input *debug-io*) - (princ condition) - ;; FIXME: Doing input on *DEBUG-IO* - ;; and output on T seems broken. - (format t - "~&error flushed (because ~ - ~S is set)" - '*flush-debug-errors*) - (throw 'debug-loop-catcher nil))))) - ;; We have to bind level for the restart function created by + (handler-bind ((error (lambda (condition) + (when *flush-debug-errors* + (clear-input *debug-io*) + (princ condition) + ;; FIXME: Doing input on *DEBUG-IO* + ;; and output on T seems broken. + (format t + "~&error flushed (because ~ + ~S is set)" + '*flush-debug-errors*) + (/show0 "throwing DEBUG-LOOP-CATCHER") + (throw 'debug-loop-catcher nil))))) + ;; We have to bind LEVEL for the 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*) + (with-simple-restart (abort + "Reduce debugger level (to debug level ~W)." + level) + (debug-prompt *debug-io*) + (force-output *debug-io*) (let ((input (sb!int:get-stream-command *debug-io*))) (cond (input (let ((cmd-fun (debug-command-p @@ -738,7 +837,7 @@ Function and macro commands: (apply cmd-fun (sb!int:stream-command-args input)))))) (t - (let* ((exp (read)) + (let* ((exp (read *debug-io*)) (cmd-fun (debug-command-p exp restart-commands))) (cond ((not cmd-fun) @@ -752,20 +851,14 @@ Function and macro commands: (t (funcall cmd-fun))))))))))))))) -(defvar *auto-eval-in-frame* t - #!+sb-doc - "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.") - ;;; FIXME: We could probably use INTERACTIVE-EVAL for much of this logic. -(defun debug-eval-print (exp) - (setq +++ ++ ++ + + - - exp) - (let* ((values (multiple-value-list - (if (and (fboundp 'compile) *auto-eval-in-frame*) - (sb!di:eval-in-frame *current-frame* -) - (eval -)))) +(defun debug-eval-print (expr) + (/noshow "entering DEBUG-EVAL-PRINT" expr) + (/noshow (fboundp 'compile)) + (setq +++ ++ ++ + + - - expr) + (let* ((values (multiple-value-list (eval -))) (*standard-output* *debug-io*)) + (/noshow "done with EVAL in DEBUG-EVAL-PRINT") (fresh-line) (if values (prin1 (car values))) (dolist (x (cdr values)) @@ -777,31 +870,29 @@ Function and macro commands: (unless (boundp '*) (setq * nil) (fresh-line) - ;; FIXME: Perhaps this shouldn't be WARN (for fear of complicating - ;; the debugging situation?) but at least it should go to *ERROR-OUTPUT*. - ;; (And probably it should just be WARN.) + ;; FIXME: The way INTERACTIVE-EVAL does this seems better. (princ "Setting * to NIL (was unbound marker).")))) ;;;; debug loop functions -;;; These commands are functions, not really commands, so that users can get -;;; their hands on the values returned. +;;; These commands are functions, not really commands, so that users +;;; can get their hands on the values returned. (eval-when (:execute :compile-toplevel) (sb!xc:defmacro define-var-operation (ref-or-set &optional value-var) `(let* ((temp (etypecase name - (symbol (sb!di:debug-function-symbol-variables - (sb!di:frame-debug-function *current-frame*) + (symbol (sb!di:debug-fun-symbol-vars + (sb!di:frame-debug-fun *current-frame*) name)) (simple-string (sb!di:ambiguous-debug-vars - (sb!di:frame-debug-function *current-frame*) + (sb!di:frame-debug-fun *current-frame*) name)))) (location (sb!di:frame-code-location *current-frame*)) ;; Let's only deal with valid variables. - (vars (remove-if-not #'(lambda (v) - (eq (sb!di:debug-var-validity v location) - :valid)) + (vars (remove-if-not (lambda (v) + (eq (sb!di:debug-var-validity v location) + :valid)) temp))) (declare (list vars)) (cond ((null vars) @@ -814,8 +905,8 @@ Function and macro commands: `(setf (sb!di:debug-var-value (car vars) *current-frame*) ,value-var)))) (t - ;; Since we have more than one, first see whether we have any - ;; variables that exactly match the specification. + ;; Since we have more than one, first see whether we have + ;; any variables that exactly match the specification. (let* ((name (etypecase name (symbol (symbol-name name)) (simple-string name))) @@ -837,26 +928,27 @@ Function and macro commands: (:set `(setf (sb!di:debug-var-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. + ;; 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= (sb!di:debug-var-symbol-name v) - (sb!di:debug-var-symbol-name (car vars)))) + (lambda (v) + (string= (sb!di:debug-var-symbol-name v) + (sb!di:debug-var-symbol-name (car vars)))) (cdr vars))) (error "specification ambiguous:~%~{ ~A~%~}" (mapcar #'sb!di:debug-var-symbol-name (delete-duplicates vars :test #'string= :key #'sb!di:debug-var-symbol-name)))) - ;; All names are the same, so see whether the user ID'ed one of - ;; them. + ;; All names are the same, so see whether the user + ;; ID'ed one of them. (id-supplied (let ((v (find id vars :key #'sb!di:debug-var-id))) (unless v (error - "invalid variable ID, ~D: should have been one of ~S" + "invalid variable ID, ~W: should have been one of ~S" id (mapcar #'sb!di:debug-var-id vars))) ,(ecase ref-or-set @@ -872,9 +964,11 @@ Function and macro commands: ) ; EVAL-WHEN +;;; FIXME: This doesn't work. It would be real nice we could make it +;;; work! Alas, it doesn't seem to work in CMU CL X86 either.. (defun var (name &optional (id 0 id-supplied)) #!+sb-doc - "Returns a variable's value if possible. Name is a simple-string or symbol. + "Return 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 @@ -893,11 +987,11 @@ Function and macro commands: (defun (setf var) (value name &optional (id 0 id-supplied)) (define-var-operation :set value)) -;;; This returns the COUNT'th arg as the user sees it from args, the result of -;;; SB!DI:DEBUG-FUNCTION-LAMBDA-LIST. If this returns a potential -;;; DEBUG-VAR 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. +;;; This returns the COUNT'th arg as the user sees it from args, the +;;; result of SB!DI:DEBUG-FUN-LAMBDA-LIST. If this returns a +;;; potential DEBUG-VAR 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. (declaim (ftype (function (index list)) nth-arg)) (defun nth-arg (count args) (let ((n count)) @@ -914,7 +1008,8 @@ Function and macro commands: :rest ((let ((var (second ele))) (lambda-var-dispatch var (sb!di:frame-code-location *current-frame*) - (error "unused REST-arg before n'th argument") + (error "unused &REST argument before n'th +argument") (dolist (value (sb!di:debug-var-value var *current-frame*) (error @@ -923,17 +1018,17 @@ Function and macro commands: (if (zerop n) (return-from nth-arg (values value nil)) (decf n))) - (error "invalid REST-arg before n'th argument"))))) + (error "invalid &REST argument before n'th argument"))))) (decf n)))) (defun arg (n) #!+sb-doc - "Returns the N'th argument's value if possible. Argument zero is the first + "Return 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 (sb!di:debug-function-lambda-list - (sb!di:frame-debug-function *current-frame*)) + (nth-arg n (handler-case (sb!di:debug-fun-lambda-list + (sb!di:frame-debug-fun *current-frame*)) (sb!di:lambda-list-unavailable () (error "No argument values are available.")))) (if lambda-var-p @@ -949,10 +1044,8 @@ Function and macro commands: ;;; Interface to *DEBUG-COMMANDS*. No required arguments in args are ;;; permitted. -;;; -;;; FIXME: This is not needed in the target Lisp system. -(defmacro def-debug-command (name args &rest body) - (let ((fun-name (intern (concatenate 'simple-string name "-DEBUG-COMMAND")))) +(defmacro !def-debug-command (name args &rest body) + (let ((fun-name (symbolicate name "-DEBUG-COMMAND"))) `(progn (setf *debug-commands* (remove ,name *debug-commands* :key #'car :test #'string=)) @@ -963,24 +1056,25 @@ Function and macro commands: (push (cons ,name #',fun-name) *debug-commands*) ',fun-name))) -(defun def-debug-command-alias (new-name existing-name) +(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) -;;; 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. +;;; 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. (defun debug-command-p (form &optional other-commands) (if (or (symbolp form) (integerp form)) (let* ((name (if (symbolp form) (symbol-name form) - (format nil "~D" form))) + (format nil "~W" form))) (len (length name)) (res nil)) (declare (simple-string name) @@ -1011,29 +1105,31 @@ Function and macro commands: ((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. +;;; Return 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). +;;; 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! (dolist (restart 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)))) - (incf num)) - commands)) + (let ((restart-fun + (lambda () + (/show0 "in restart-command closure, about to i-r-i") + (invoke-restart-interactively restart)))) + (push (cons (prin1-to-string num) restart-fun) commands) + (unless (or (null (restart-name restart)) + (find name commands :key #'car :test #'string=)) + (push (cons name restart-fun) commands)))) + (incf num)) + commands)) ;;;; frame-changing commands -(def-debug-command "UP" () +(!def-debug-command "UP" () (let ((next (sb!di:frame-up *current-frame*))) (cond (next (setf *current-frame* next) @@ -1041,7 +1137,7 @@ Function and macro commands: (t (format t "~&Top of stack."))))) -(def-debug-command "DOWN" () +(!def-debug-command "DOWN" () (let ((next (sb!di:frame-down *current-frame*))) (cond (next (setf *current-frame* next) @@ -1049,26 +1145,29 @@ Function and macro commands: (t (format t "~&Bottom of stack."))))) -(def-debug-command-alias "D" "DOWN") +(!def-debug-command-alias "D" "DOWN") -(def-debug-command "TOP" () - (do ((prev *current-frame* lead) - (lead (sb!di:frame-up *current-frame*) (sb!di:frame-up lead))) - ((null lead) - (setf *current-frame* prev) - (print-frame-call prev)))) +;;; CMU CL had this command, but SBCL doesn't, since it's redundant +;;; with "FRAME 0", and it interferes with abbreviations for the +;;; TOPLEVEL restart. +;;;(!def-debug-command "TOP" () +;;; (do ((prev *current-frame* lead) +;;; (lead (sb!di:frame-up *current-frame*) (sb!di:frame-up lead))) +;;; ((null lead) +;;; (setf *current-frame* prev) +;;; (print-frame-call prev)))) -(def-debug-command "BOTTOM" () +(!def-debug-command "BOTTOM" () (do ((prev *current-frame* lead) (lead (sb!di:frame-down *current-frame*) (sb!di:frame-down lead))) ((null lead) (setf *current-frame* prev) (print-frame-call prev)))) -(def-debug-command-alias "B" "BOTTOM") +(!def-debug-command-alias "B" "BOTTOM") -(def-debug-command "FRAME" (&optional - (n (read-prompting-maybe "frame number: "))) +(!def-debug-command "FRAME" (&optional + (n (read-prompting-maybe "frame number: "))) (setf *current-frame* (multiple-value-bind (next-frame-fun limit-string) (if (< n (sb!di:frame-number *current-frame*)) @@ -1087,35 +1186,47 @@ Function and macro commands: (return frame))))))) (print-frame-call *current-frame*)) -(def-debug-command-alias "F" "FRAME") +(!def-debug-command-alias "F" "FRAME") ;;;; commands for entering and leaving the debugger -(def-debug-command "QUIT" () - (throw 'sb!impl::top-level-catcher nil)) +;;; CMU CL supported this QUIT debug command, but SBCL provides this +;;; functionality with a restart instead. (The QUIT debug command was +;;; removed because it's confusing to have "quit" mean two different +;;; things in the system, "restart the top level REPL" in the debugger +;;; and "terminate the Lisp system" as the SB-EXT:QUIT function.) +;;; +;;;(!def-debug-command "QUIT" () +;;; (throw 'sb!impl::toplevel-catcher nil)) -(def-debug-command "GO" () - (continue *debug-condition*) - (error "There is no restart named CONTINUE.")) +;;; CMU CL supported this GO debug command, but SBCL doesn't -- in +;;; SBCL you just type the CONTINUE restart name instead (or "RESTART +;;; CONTINUE", that's OK too). + +;;;(!def-debug-command "GO" () +;;; (continue *debug-condition*) +;;; (error "There is no restart named CONTINUE.")) -(def-debug-command "RESTART" () +(!def-debug-command "RESTART" () + (/show0 "doing RESTART debug-command") (let ((num (read-if-available :prompt))) (when (eq num :prompt) - (show-restarts *debug-restarts*) + (show-restarts *debug-restarts* *debug-io*) (write-string "restart: ") (force-output) - (setf num (read *standard-input*))) + (setf num (read *debug-io*))) (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))))) + :test (lambda (sym1 sym2) + (string= (symbol-name sym1) + (symbol-name sym2))))) (t (format t "~S is invalid as a restart name.~%" num) (return-from restart-debug-command nil))))) + (/show0 "got RESTART") (if restart (invoke-restart-interactively restart) ;; FIXME: Even if this isn't handled by WARN, it probably @@ -1126,33 +1237,33 @@ Function and macro commands: ;;;; information commands -(def-debug-command "HELP" () +(!def-debug-command "HELP" () ;; CMU CL had a little toy pager here, but "if you aren't running ;; ILISP (or a smart windowing system, or something) you deserve to ;; lose", so we've dropped it in SBCL. However, in case some ;; desperate holdout is running this on a dumb terminal somewhere, ;; we tell him where to find the message stored as a string. (format *debug-io* - "~&~a~2%(The HELP string is stored in ~S.)~%" + "~&~A~2%(The HELP string is stored in ~S.)~%" *debug-help-string* '*debug-help-string*)) -(def-debug-command-alias "?" "HELP") +(!def-debug-command-alias "?" "HELP") -(def-debug-command "ERROR" () - (format t "~A~%" *debug-condition*) - (show-restarts *debug-restarts*)) +(!def-debug-command "ERROR" () + (format *debug-io* "~A~%" *debug-condition*) + (show-restarts *debug-restarts* *debug-io*)) -(def-debug-command "BACKTRACE" () +(!def-debug-command "BACKTRACE" () (backtrace (read-if-available most-positive-fixnum))) -(def-debug-command "PRINT" () +(!def-debug-command "PRINT" () (print-frame-call *current-frame*)) -(def-debug-command-alias "P" "PRINT") +(!def-debug-command-alias "P" "PRINT") -(def-debug-command "LIST-LOCALS" () - (let ((d-fun (sb!di:frame-debug-function *current-frame*))) +(!def-debug-command "LIST-LOCALS" () + (let ((d-fun (sb!di:frame-debug-fun *current-frame*))) (if (sb!di:debug-var-info-available d-fun) (let ((*standard-output* *debug-io*) (location (sb!di:frame-code-location *current-frame*)) @@ -1165,7 +1276,7 @@ Function and macro commands: (setf any-p t) (when (eq (sb!di:debug-var-validity v location) :valid) (setf any-valid-p t) - (format t "~S~:[#~D~;~*~] = ~S~%" + (format t "~S~:[#~W~;~*~] = ~S~%" (sb!di:debug-var-symbol v) (zerop (sb!di:debug-var-id v)) (sb!di:debug-var-id v) @@ -1182,17 +1293,18 @@ Function and macro commands: prefix)))) (write-line "There is no variable information available.")))) -(def-debug-command-alias "L" "LIST-LOCALS") +(!def-debug-command-alias "L" "LIST-LOCALS") -(def-debug-command "SOURCE" () +(!def-debug-command "SOURCE" () (fresh-line) (print-code-location-source-form (sb!di:frame-code-location *current-frame*) (read-if-available 0))) ;;;; 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. +;;; We cache a stream to the last valid file debug source so that we +;;; won't have to repeatedly open the file. +;;; ;;; KLUDGE: This sounds like a bug, not a feature. Opening files is fast ;;; in the 1990s, so the benefit is negligible, less important than the ;;; potential of extra confusion if someone changes the source during @@ -1210,43 +1322,44 @@ Function and macro commands: (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)) - sb!int:*before-save-initializations*) - -;;; We also cache the last top-level form that we printed a source for so that -;;; we don't have to do repeated reads and calls to FORM-NUMBER-TRANSLATIONS. -(defvar *cached-top-level-form-offset* nil) -(declaim (type (or index null) *cached-top-level-form-offset*)) -(defvar *cached-top-level-form*) +(pushnew (lambda () + (setq *cached-debug-source* nil *cached-source-stream* nil + *cached-readtable* nil)) + *before-save-initializations*) + +;;; We also cache the last toplevel form that we printed a source for +;;; so that we don't have to do repeated reads and calls to +;;; FORM-NUMBER-TRANSLATIONS. +(defvar *cached-toplevel-form-offset* nil) +(declaim (type (or index null) *cached-toplevel-form-offset*)) +(defvar *cached-toplevel-form*) (defvar *cached-form-number-translations*) -;;; 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) +;;; 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-toplevel-form (location) (let ((d-source (sb!di:code-location-debug-source location))) (if (and (eq d-source *cached-debug-source*) - (eql (sb!di:code-location-top-level-form-offset location) - *cached-top-level-form-offset*)) - (values *cached-form-number-translations* *cached-top-level-form*) - (let* ((offset (sb!di:code-location-top-level-form-offset location)) + (eql (sb!di:code-location-toplevel-form-offset location) + *cached-toplevel-form-offset*)) + (values *cached-form-number-translations* *cached-toplevel-form*) + (let* ((offset (sb!di:code-location-toplevel-form-offset location)) (res (ecase (sb!di:debug-source-from d-source) - (:file (get-file-top-level-form location)) + (:file (get-file-toplevel-form location)) (:lisp (svref (sb!di:debug-source-name d-source) offset))))) - (setq *cached-top-level-form-offset* offset) + (setq *cached-toplevel-form-offset* offset) (values (setq *cached-form-number-translations* (sb!di:form-number-translations res offset)) - (setq *cached-top-level-form* res)))))) + (setq *cached-toplevel-form* res)))))) -;;; 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) +;;; Locate the source file (if it still exists) and grab 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-toplevel-form (location) (let* ((d-source (sb!di:code-location-debug-source location)) - (tlf-offset (sb!di:code-location-top-level-form-offset location)) + (tlf-offset (sb!di:code-location-toplevel-form-offset location)) (local-tlf-offset (- tlf-offset (sb!di:debug-source-root-number d-source))) (char-offset @@ -1285,10 +1398,10 @@ Function and macro commands: (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))) + (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*)))) @@ -1296,7 +1409,7 @@ Function and macro commands: (defun print-code-location-source-form (location context) (let* ((location (maybe-block-start-location location)) (form-num (sb!di:code-location-form-number location))) - (multiple-value-bind (translations form) (get-top-level-form location) + (multiple-value-bind (translations form) (get-toplevel-form location) (unless (< form-num (length translations)) (error "The source path no longer exists.")) (prin1 (sb!di:source-path-context form @@ -1306,33 +1419,34 @@ Function and macro commands: ;;; breakpoint and step commands ;;; Step to the next code-location. -(def-debug-command "STEP" () +(!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 GO -;;; will continue. 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-function*))) +;;; 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:function-debug-function (eval df))) - (setf *default-breakpoint-debug-function* df)) + (setf df (sb!di:fun-debug-fun (eval df))) + (setf *default-breakpoint-debug-fun* df)) ((or (eq ':c df) - (not *default-breakpoint-debug-function*)) - (setf df (sb!di:frame-debug-function *current-frame*)) - (setf *default-breakpoint-debug-function* 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-function* - *breakpoints* :function-start)) + (let ((active (location-in-list *default-breakpoint-debug-fun* + *breakpoints* :fun-start)) (here (sb!di:code-location= - (sb!di:debug-function-start-location - *default-breakpoint-debug-function*) continue-at))) + (sb!di:debug-fun-start-location + *default-breakpoint-debug-fun*) continue-at))) (when (or active here) - (format t "::FUNCTION-START ") + (format t "::FUN-START ") (when active (format t " *Active*")) (when here (format t " *Continue here*")))) @@ -1343,8 +1457,8 @@ Function and macro commands: (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))) + (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))) @@ -1360,9 +1474,9 @@ Function and macro commands: (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-top-level-form-offset + (not (eq (sb!di:code-location-toplevel-form-offset code-location) - (sb!di:code-location-top-level-form-offset + (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)))) @@ -1371,15 +1485,15 @@ Function and macro commands: (incf this-num)))) - (when (location-in-list *default-breakpoint-debug-function* + (when (location-in-list *default-breakpoint-debug-fun* *breakpoints* - :function-end) - (format t "~&::FUNCTION-END *Active* ")))) + :fun-end) + (format t "~&::FUN-END *Active* ")))) -(def-debug-command-alias "LL" "LIST-LOCATIONS") +(!def-debug-command-alias "LL" "LIST-LOCATIONS") ;;; Set breakpoint at the given number. -(def-debug-command "BREAKPOINT" () +(!def-debug-command "BREAKPOINT" () (let ((index (read-prompting-maybe "location number, :START, or :END: ")) (break t) (condition t) @@ -1387,7 +1501,7 @@ Function and macro commands: (print-functions nil) (function nil) (bp) - (place *default-breakpoint-debug-function*)) + (place *default-breakpoint-debug-fun*)) (flet ((get-command-line () (let ((command-line nil) (unique '(nil))) @@ -1405,27 +1519,27 @@ Function and macro commands: (:break (setf break (pop command-line))) (:function (setf function (eval (pop command-line))) - (setf *default-breakpoint-debug-function* - (sb!di:function-debug-function function)) - (setf place *default-breakpoint-debug-function*) + (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-function*)))))) - (setup-function-start () - (let ((code-loc (sb!di:debug-function-start-location place))) - (setf bp (sb!di:make-breakpoint #'main-hook-function + *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 :function-start)) + :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-function-end () + (setup-fun-end () (setf bp - (sb!di:make-breakpoint #'main-hook-function + (sb!di:make-breakpoint #'main-hook-fun place - :kind :function-end)) + :kind :fun-end)) (setf break ;; FIXME: These and any other old (COERCE `(LAMBDA ..) ..) ;; forms should be converted to shiny new (LAMBDA ..) forms. @@ -1444,8 +1558,7 @@ Function and macro commands: print-functions))) (setup-code-location () (setf place (nth index *possible-breakpoints*)) - (setf bp (sb!di:make-breakpoint #'main-hook-function - place + (setf bp (sb!di:make-breakpoint #'main-hook-fun place :kind :code-location)) (dolist (form print) (push (cons @@ -1457,9 +1570,9 @@ Function and macro commands: (set-vars-from-command-line (get-command-line)) (cond ((or (eq index :start) (eq index :s)) - (setup-function-start)) + (setup-fun-start)) ((or (eq index :end) (eq index :e)) - (setup-function-end)) + (setup-fun-end)) (t (setup-code-location))) (sb!di:activate-breakpoint bp) @@ -1477,20 +1590,20 @@ Function and macro commands: (print-breakpoint-info (first *breakpoints*)) (format t "~&added")))) -(def-debug-command-alias "BP" "BREAKPOINT") +(!def-debug-command-alias "BP" "BREAKPOINT") ;;; List all breakpoints which are set. -(def-debug-command "LIST-BREAKPOINTS" () +(!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") +(!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" () +(!def-debug-command "DELETE-BREAKPOINT" () (let* ((index (read-if-available nil)) (bp-info (find index *breakpoints* :key #'breakpoint-info-breakpoint-number))) @@ -1505,28 +1618,30 @@ Function and macro commands: (setf *breakpoints* nil) (format t "all breakpoints deleted~%"))))) -(def-debug-command-alias "DBP" "DELETE-BREAKPOINT") +(!def-debug-command-alias "DBP" "DELETE-BREAKPOINT") ;;; miscellaneous commands -(def-debug-command "DESCRIBE" () +(!def-debug-command "DESCRIBE" () (let* ((curloc (sb!di:frame-code-location *current-frame*)) - (debug-fun (sb!di:code-location-debug-function curloc)) - (function (sb!di:debug-function-function debug-fun))) + (debug-fun (sb!di:code-location-debug-fun curloc)) + (function (sb!di:debug-fun-fun debug-fun))) (if function (describe function) (format t "can't figure out the function for this frame")))) + +(!def-debug-command "SLURP" () + (loop while (read-char-no-hang *standard-input*))) ;;;; debug loop command utilities -(defun read-prompting-maybe (prompt &optional (in *standard-input*) - (out *standard-output*)) - (unless (sb!int:listen-skip-whitespace in) - (princ prompt out) - (force-output out)) - (read in)) +(defun read-prompting-maybe (prompt) + (unless (sb!int:listen-skip-whitespace *debug-io*) + (princ prompt) + (force-output)) + (read *debug-io*)) -(defun read-if-available (default &optional (stream *standard-input*)) - (if (sb!int:listen-skip-whitespace stream) - (read stream) +(defun read-if-available (default) + (if (sb!int:listen-skip-whitespace *debug-io*) + (read *debug-io*) default))