(in-package "SB!KERNEL")
\f
+;;;; miscellaneous support utilities
+
+;;; Signalling an error when trying to print an error condition is
+;;; generally a PITA, so whatever the failure encountered when
+;;; wondering about FILE-POSITION within a condition printer, 'tis
+;;; better silently to give up than to try to complain.
+(defun file-position-or-nil-for-error (stream &optional (pos nil posp))
+ ;; Arguably FILE-POSITION shouldn't be signalling errors at all; but
+ ;; "NIL if this cannot be determined" in the ANSI spec doesn't seem
+ ;; absolutely unambiguously to prohibit errors when, e.g., STREAM
+ ;; has been closed so that FILE-POSITION is a nonsense question. So
+ ;; my (WHN) impression is that the conservative approach is to
+ ;; IGNORE-ERRORS. (I encountered this failure from within a homebrew
+ ;; defsystemish operation where the ERROR-STREAM had been CL:CLOSEd,
+ ;; I think by nonlocally exiting through a WITH-OPEN-FILE, by the
+ ;; time an error was reported.)
+ (if posp
+ (ignore-errors (file-position stream pos))
+ (ignore-errors (file-position stream))))
+\f
;;;; the CONDITION class
(/show0 "condition.lisp 20")
"Make an instance of a condition object using the specified initargs."
;; Note: ANSI specifies no exceptional situations in this function.
;; signalling simple-type-error would not be wrong.
- (let* ((thing (if (symbolp thing)
- (find-classoid thing)
+ (let* ((thing (or (and (symbolp thing) (find-classoid thing nil))
thing))
(class (typecase thing
(condition-classoid thing)
(:report
(lambda (condition stream)
(let* ((error-stream (stream-error-stream condition))
- (pos (file-position error-stream)))
+ (pos (file-position-or-nil-for-error error-stream)))
(let (lineno colno)
(when (and pos
(< pos sb!xc:array-dimension-limit)
(file-position error-stream :start))
(let ((string
(make-string pos
- :element-type (stream-element-type error-stream))))
+ :element-type (stream-element-type
+ error-stream))))
(when (= pos (read-sequence string error-stream))
(setq lineno (1+ (count #\Newline string))
colno (- pos
(or (position #\Newline string :from-end t) -1)
1))))
- (file-position error-stream pos))
+ (file-position-or-nil-for-error error-stream pos))
(format stream
"READER-ERROR ~@[at ~W ~]~
~@[(line ~W~]~@[, column ~W) ~]~
(def!method print-object :around ((o reference-condition) s)
(call-next-method)
(unless (or *print-escape* *print-readably*)
- (when *print-condition-references*
+ (when (and *print-condition-references*
+ (reference-condition-references o))
(format s "~&See also:~%")
(pprint-logical-block (s nil :per-line-prefix " ")
(do* ((rs (reference-condition-references o) (cdr rs))
(define-condition extension-failure (reference-condition simple-error)
())
+(define-condition structure-initarg-not-keyword
+ (reference-condition simple-style-warning)
+ ()
+ (:default-initargs :references (list '(:ansi-cl :section (2 4 8 13)))))
+
#!+sb-package-locks
(progn
SB-EXT:PACKAGE-LOCKED-ERROR-SYMBOL."))
) ; progn
+
+(define-condition undefined-alien-error (error) ())
+
+(define-condition undefined-alien-variable-error (undefined-alien-error) ()
+ (:report
+ (lambda (condition stream)
+ (declare (ignore condition))
+ (format stream "Attempt to access an undefined alien variable."))))
+
+(define-condition undefined-alien-function-error (undefined-alien-error) ()
+ (:report
+ (lambda (condition stream)
+ (declare (ignore condition))
+ (format stream "Attempt to call an undefined alien function."))))
+
\f
;;;; various other (not specified by ANSI) CONDITIONs
;;;;
(lambda (condition stream)
(let ((error-stream (stream-error-stream condition)))
(format stream "READER-ERROR ~@[at ~W ~]on ~S:~%~?~%Original error: ~A"
- (file-position error-stream) error-stream
+ (file-position-or-nil-for-error error-stream) error-stream
(reader-error-format-control condition)
(reader-error-format-arguments condition)
(reader-impossible-number-error-error condition))))))