1 ;;;; miscellaneous error stuff that needs to be in the cold load
3 ;;;; This software is part of the SBCL system. See the README file for
6 ;;;; This software is derived from the CMU CL system, which was
7 ;;;; written at Carnegie Mellon University and released into the
8 ;;;; public domain. The software is in the public domain and is
9 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
10 ;;;; files for more information.
12 (in-package "SB!KERNEL")
14 (!defvar
*break-on-signals
* nil
15 "When (TYPEP condition *BREAK-ON-SIGNALS*) is true, then calls to SIGNAL will
16 enter the debugger prior to signalling that condition.")
18 (defun maybe-break-on-signal (condition)
19 (let ((old-bos *break-on-signals
*)
20 (bos-actually-breaking nil
))
22 (let ((break-on-signals *break-on-signals
*)
23 (*break-on-signals
* nil
))
24 ;; The rebinding encloses the TYPEP so that a bogus
25 ;; type specifier will not lead to infinite recursion when
27 (when (typep condition break-on-signals
)
28 (setf bos-actually-breaking t
)
29 (break "~A~%BREAK was entered because of *BREAK-ON-SIGNALS* ~
30 (now rebound to NIL)."
32 ;; Give the user a chance to unset *BREAK-ON-SIGNALS* on the
35 ;; (e.g.: Consider a long compilation. After a failed compile
36 ;; the user sets *BREAK-ON-SIGNALS* to T, and select the
37 ;; RECOMPILE restart. Once the user diagnoses and fixes the
38 ;; problem, he selects RECOMPILE again... and discovers that
39 ;; he's entered the *BREAK-ON-SIGNALS* hell with no escape,
40 ;; unless we provide this restart.)
45 (if bos-actually-breaking
46 "Return from BREAK and assign a new value to ~
48 "Assign a new value to *BREAK-ON-SIGNALS* and ~
49 continue with signal handling.")))
55 "Enter new value for *BREAK-ON-SIGNALS*. ~
56 Current value is ~S.~%~
59 (force-output *query-io
*)
60 (let ((*break-on-signals
* nil
))
61 (setf new-value
(eval (read *query-io
*)))
62 (if (typep new-value
'type-specifier
)
65 "~S is not a valid value for *BREAK-ON-SIGNALS* ~
66 (must be a type-specifier).~%"
69 (setf *break-on-signals
* new-value
)))))
71 (defun signal (datum &rest arguments
)
72 "Invokes the signal facility on a condition formed from DATUM and
73 ARGUMENTS. If the condition is not handled, NIL is returned. If
74 (TYPEP condition *BREAK-ON-SIGNALS*) is true, the debugger is invoked
75 before any signalling is done."
76 (declare (explicit-check))
77 (%signal
(apply #'coerce-to-condition datum
'simple-condition
'signal arguments
)))
78 (defun %signal
(condition)
79 (let ((handler-clusters *handler-clusters
*)
80 (sb!debug
:*stack-top-hint
* (or sb
!debug
:*stack-top-hint
* '%signal
)))
81 (when *break-on-signals
*
82 (maybe-break-on-signal condition
))
83 (do ((cluster (pop handler-clusters
) (pop handler-clusters
)))
86 ;; Remove CLUSTER from *HANDLER-CLUSTERS*: if a condition is
87 ;; signaled in either the type test, i.e. (the function (car
88 ;; handler)), or the handler, (the function (cdr handler)), the
89 ;; recursive SIGNAL call should not consider CLUSTER as doing
90 ;; would lead to infinite recursive SIGNAL calls.
91 (let ((*handler-clusters
* handler-clusters
))
92 (dolist (handler cluster
)
93 (macrolet ((cast-to-fun (f possibly-symbolp
)
94 ;; For efficiency the cases are tested in this order:
95 ;; - FUNCTIONP is just a lowtag test
96 ;; - FDEFN-P is a lowtag + widetag.
97 ;; Avoiding a SYMBOLP test is fine because
98 ;; SYMBOL-FUNCTION rejects bogosity anyway.
100 (cond ((functionp f
) f
)
101 (,(if possibly-symbolp
`(fdefn-p f
) 't
)
102 (sb!c
:safe-fdefn-fun f
))
103 ,@(if possibly-symbolp
104 `((t (symbol-function f
))))))))
105 (let ((test (car (truly-the cons handler
))))
106 (when (if (%instancep test
) ; a condition classoid cell
107 (classoid-cell-typep test condition
)
108 (funcall (cast-to-fun test nil
) condition
))
109 (funcall (cast-to-fun (cdr handler
) t
) condition
)))))))))
111 ;;;; working with *CURRENT-ERROR-DEPTH* and *MAXIMUM-ERROR-DEPTH*
113 ;;; counts of nested errors (with internal errors double-counted)
114 (defvar *maximum-error-depth
*) ; this gets set to 10 in !COLD-INIT
115 (!defvar
*current-error-depth
* 0)
117 ;;; INFINITE-ERROR-PROTECT is used by ERROR and friends to keep us out
119 (defmacro infinite-error-protect
(&rest forms
)
120 `(let ((*current-error-depth
* (infinite-error-protector)))
121 (/show0
"in INFINITE-ERROR-PROTECT, incremented error depth")
122 ;; This is almost totally unhelpful. Running with #!+sb-show does not mean
123 ;; that you care to see an additional 16K characters of output
124 ;; each time this macro is used when no error is actually happening.
125 #|
#!+sb-show
(sb!debug
:print-backtrace
:count
8) ; arbitrary truncation |#
128 ;;; a helper function for INFINITE-ERROR-PROTECT
129 (defun infinite-error-protector ()
130 (/show0
"entering INFINITE-ERROR-PROTECTOR, *CURRENT-ERROR-DEPTH*=..")
131 (/hexstr
*current-error-depth
*)
132 ;; *MAXIMUM-ERROR-DEPTH* is not bound during cold-init, and testing BOUNDP
133 ;; is superfluous since REALP will return false either way.
134 (let ((cur (locally (declare (optimize (safety 0))) *current-error-depth
*))
135 (max (locally (declare (optimize (safety 0))) *maximum-error-depth
*)))
136 (cond ((or (not (fixnump cur
)) (not (fixnump max
)))
137 (%primitive print
"Argh! corrupted error depth, halting")
138 (%primitive sb
!c
:halt
))
140 (/show0
"*MAXIMUM-ERROR-DEPTH*=..")
142 (/show0
"in INFINITE-ERROR-PROTECTOR, calling ERROR-ERROR")
143 (sb!impl
::error-error
"Help! "
146 "SB-KERNEL:*MAXIMUM-ERROR-DEPTH* exceeded."))
148 (/show0
"returning normally from INFINITE-ERROR-PROTECTOR")
149 (1+ *current-error-depth
*)))))
151 (defun error (datum &rest arguments
)
152 "Invoke the signal facility on a condition formed from DATUM and ARGUMENTS.
153 If the condition is not handled, the debugger is invoked."
154 (/show0
"entering ERROR, argument list=..")
157 (/show0
"cold-printing ERROR arguments one by one..")
158 #!+sb-show
(dolist (argument arguments
)
159 (sb!impl
::cold-print argument
))
160 (/show0
"done cold-printing ERROR arguments")
162 (infinite-error-protect
163 (let ((condition (apply #'coerce-to-condition datum
'simple-error
'error
165 (sb!debug
:*stack-top-hint
* (or sb
!debug
:*stack-top-hint
* 'error
)))
166 (/show0
"signalling CONDITION from within ERROR")
168 (/show0
"done signalling CONDITION within ERROR")
169 (invoke-debugger condition
))))
171 (defun cerror (continue-string datum
&rest arguments
)
172 (infinite-error-protect
174 (continue "~A" (apply #'format nil continue-string arguments
))
175 (let ((condition (apply #'coerce-to-condition datum
176 'simple-error
'cerror arguments
)))
177 (with-condition-restarts condition
(list (find-restart 'continue
))
178 (let ((sb!debug
:*stack-top-hint
* (or sb
!debug
:*stack-top-hint
* 'cerror
)))
180 (invoke-debugger condition
))))))
183 ;;; like BREAK, but without rebinding *DEBUGGER-HOOK* to NIL, so that
184 ;;; we can use it in system code (e.g. in SIGINT handling) without
185 ;;; messing up --disable-debugger mode (which works by setting
186 ;;; *DEBUGGER-HOOK*); or for that matter, without messing up ordinary
187 ;;; applications which try to do similar things with *DEBUGGER-HOOK*
188 (defun %break
(what &optional
(datum "break") &rest arguments
)
189 (infinite-error-protect
190 (with-simple-restart (continue "Return from ~S." what
)
191 (let ((sb!debug
:*stack-top-hint
* (or sb
!debug
:*stack-top-hint
* '%break
)))
193 (apply #'coerce-to-condition datum
'simple-condition what arguments
)))))
196 (defun break (&optional
(datum "break") &rest arguments
)
197 "Print a message and invoke the debugger without allowing any possibility
198 of condition handling occurring."
199 (let ((*debugger-hook
* nil
) ; as specifically required by ANSI
200 (sb!debug
:*stack-top-hint
* (or sb
!debug
:*stack-top-hint
* 'break
)))
201 (apply #'%break
'break datum arguments
)))
203 ;;; These functions definitions are for cold-init.
204 ;;; The real definitions are found in 'condition.lisp'
205 (defvar *!cold-warn-action
* nil
)
206 (defun warn (datum &rest arguments
)
207 (when (and (stringp datum
) (plusp (mismatch "defining setf macro" datum
)))
208 (return-from warn nil
))
209 (let ((action (cond ((boundp '*!cold-warn-action
*) *!cold-warn-action
*)
211 '(asterisks-around-constant-variable-name
212 redefinition-with-defun
)))
214 (when (member action
'(lose print
))
215 (let ((*package
* *cl-package
*))
216 (write-string "cold WARN: datum=") ; WRITE could be too broken as yet
217 (write (get-lisp-obj-address datum
) :radix t
:base
16)
221 (write (get-lisp-obj-address arguments
) :radix t
:base
16)
223 (when (eq action
'lose
) (sb!sys
:%primitive sb
!c
:halt
))))
224 (defun style-warn (datum &rest arguments
)
225 (declare (notinline warn
))
226 (apply 'warn datum arguments
))