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;;;; stuff originally from CMU CL's error.lisp which can or should
;;;; come late (mostly related to the CONDITION class itself)
;;;;
;;;; This software is part of the SBCL system. See the README file for
;;;; more information.
;;;;
;;;; This software is derived from the CMU CL system, which was
;;;; written at Carnegie Mellon University and released into the
;;;; public domain. The software is in the public domain and is
;;;; provided with absolutely no warranty. See the COPYING and CREDITS
;;;; files for more information.
(in-package "SB!KERNEL")
;;;; 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))))
;;;; the CONDITION class
(/show0 "condition.lisp 20")
(eval-when (:compile-toplevel :load-toplevel :execute)
(/show0 "condition.lisp 24")
(def!struct (condition-classoid (:include slot-classoid)
(:constructor make-condition-classoid))
;; list of CONDITION-SLOT structures for the direct slots of this
;; class
(slots nil :type list)
;; list of CONDITION-SLOT structures for all of the effective class
;; slots of this class
(class-slots nil :type list)
;; report function or NIL
(report nil :type (or function null))
;; list of alternating initargs and initforms
(default-initargs () :type list)
;; class precedence list as a list of CLASS objects, with all
;; non-CONDITION classes removed
(cpl () :type list)
;; a list of all the effective instance allocation slots of this
;; class that have a non-constant initform or default-initarg.
;; Values for these slots must be computed in the dynamic
;; environment of MAKE-CONDITION.
(hairy-slots nil :type list))
(/show0 "condition.lisp 49")
) ; EVAL-WHEN
(!defstruct-with-alternate-metaclass condition
:slot-names (actual-initargs assigned-slots)
:boa-constructor %make-condition-object
:superclass-name instance
:metaclass-name condition-classoid
:metaclass-constructor make-condition-classoid
:dd-type structure)
(defun make-condition-object (actual-initargs)
(%make-condition-object actual-initargs nil))
(defstruct (condition-slot (:copier nil))
(name (missing-arg) :type symbol)
;; list of all applicable initargs
(initargs (missing-arg) :type list)
;; names of reader and writer functions
(readers (missing-arg) :type list)
(writers (missing-arg) :type list)
;; true if :INITFORM was specified
(initform-p (missing-arg) :type (member t nil))
;; If this is a function, call it with no args. Otherwise, it's the
;; actual value.
(initform (missing-arg) :type t)
;; allocation of this slot, or NIL until defaulted
(allocation nil :type (member :instance :class nil))
;; If ALLOCATION is :CLASS, this is a cons whose car holds the value.
(cell nil :type (or cons null))
;; slot documentation
(documentation nil :type (or string null)))
;;; KLUDGE: It's not clear to me why CONDITION-CLASS has itself listed
;;; in its CPL, while other classes derived from CONDITION-CLASS don't
;;; have themselves listed in their CPLs. This behavior is inherited
;;; from CMU CL, and didn't seem to be explained there, and I haven't
;;; figured out whether it's right. -- WHN 19990612
(eval-when (:compile-toplevel :load-toplevel :execute)
(/show0 "condition.lisp 103")
(let ((condition-class (locally
;; KLUDGE: There's a DEFTRANSFORM
;; FIND-CLASSOID for constant class names
;; which creates fast but
;; non-cold-loadable, non-compact code. In
;; this context, we'd rather have compact,
;; cold-loadable code. -- WHN 19990928
(declare (notinline find-classoid))
(find-classoid 'condition))))
(setf (condition-classoid-cpl condition-class)
(list condition-class)))
(/show0 "condition.lisp 103"))
(setf (condition-classoid-report (locally
;; KLUDGE: There's a DEFTRANSFORM
;; FIND-CLASSOID for constant class
;; names which creates fast but
;; non-cold-loadable, non-compact
;; code. In this context, we'd
;; rather have compact,
;; cold-loadable code. -- WHN
;; 19990928
(declare (notinline find-classoid))
(find-classoid 'condition)))
(lambda (cond stream)
(format stream "Condition ~S was signalled." (type-of cond))))
(eval-when (:compile-toplevel :load-toplevel :execute)
(defun find-condition-layout (name parent-types)
(let* ((cpl (remove-duplicates
(reverse
(reduce #'append
(mapcar (lambda (x)
(condition-classoid-cpl
(find-classoid x)))
parent-types)))))
(cond-layout (info :type :compiler-layout 'condition))
(olayout (info :type :compiler-layout name))
;; FIXME: Does this do the right thing in case of multiple
;; inheritance? A quick look at DEFINE-CONDITION didn't make
;; it obvious what ANSI intends to be done in the case of
;; multiple inheritance, so it's not actually clear what the
;; right thing is..
(new-inherits
(order-layout-inherits (concatenate 'simple-vector
(layout-inherits cond-layout)
(mapcar #'classoid-layout cpl)))))
(if (and olayout
(not (mismatch (layout-inherits olayout) new-inherits)))
olayout
(make-layout :classoid (make-undefined-classoid name)
:inherits new-inherits
:depthoid -1
:length (layout-length cond-layout)))))
) ; EVAL-WHEN
;;; FIXME: ANSI's definition of DEFINE-CONDITION says
;;; Condition reporting is mediated through the PRINT-OBJECT method
;;; for the condition type in question, with *PRINT-ESCAPE* always
;;; being nil. Specifying (:REPORT REPORT-NAME) in the definition of
;;; a condition type C is equivalent to:
;;; (defmethod print-object ((x c) stream)
;;; (if *print-escape* (call-next-method) (report-name x stream)))
;;; The current code doesn't seem to quite match that.
(def!method print-object ((x condition) stream)
(if *print-escape*
(print-unreadable-object (x stream :type t :identity t))
;; KLUDGE: A comment from CMU CL here said
;; 7/13/98 BUG? CPL is not sorted and results here depend on order of
;; superclasses in define-condition call!
(dolist (class (condition-classoid-cpl (classoid-of x))
(error "no REPORT? shouldn't happen!"))
(let ((report (condition-classoid-report class)))
(when report
(return (funcall report x stream)))))))
;;;; slots of CONDITION objects
(defvar *empty-condition-slot* '(empty))
(defun find-slot-default (class slot)
(let ((initargs (condition-slot-initargs slot))
(cpl (condition-classoid-cpl class)))
(dolist (class cpl)
(let ((default-initargs (condition-classoid-default-initargs class)))
(dolist (initarg initargs)
(let ((val (getf default-initargs initarg *empty-condition-slot*)))
(unless (eq val *empty-condition-slot*)
(return-from find-slot-default
(if (functionp val)
(funcall val)
val)))))))
(if (condition-slot-initform-p slot)
(let ((initform (condition-slot-initform slot)))
(if (functionp initform)
(funcall initform)
initform))
(error "unbound condition slot: ~S" (condition-slot-name slot)))))
(defun find-condition-class-slot (condition-class slot-name)
(dolist (sclass
(condition-classoid-cpl condition-class)
(error "There is no slot named ~S in ~S."
slot-name condition-class))
(dolist (slot (condition-classoid-slots sclass))
(when (eq (condition-slot-name slot) slot-name)
(return-from find-condition-class-slot slot)))))
(defun condition-writer-function (condition new-value name)
(dolist (cslot (condition-classoid-class-slots
(layout-classoid (%instance-layout condition)))
(setf (getf (condition-assigned-slots condition) name)
new-value))
(when (eq (condition-slot-name cslot) name)
(return (setf (car (condition-slot-cell cslot)) new-value)))))
(defun condition-reader-function (condition name)
(let ((class (layout-classoid (%instance-layout condition))))
(dolist (cslot (condition-classoid-class-slots class))
(when (eq (condition-slot-name cslot) name)
(return-from condition-reader-function
(car (condition-slot-cell cslot)))))
(let ((val (getf (condition-assigned-slots condition) name
*empty-condition-slot*)))
(if (eq val *empty-condition-slot*)
(let ((actual-initargs (condition-actual-initargs condition))
(slot (find-condition-class-slot class name)))
(unless slot
(error "missing slot ~S of ~S" name condition))
(do ((initargs actual-initargs (cddr initargs)))
((endp initargs)
(setf (getf (condition-assigned-slots condition) name)
(find-slot-default class slot)))
(when (member (car initargs) (condition-slot-initargs slot))
(return-from condition-reader-function
(setf (getf (condition-assigned-slots condition)
name)
(cadr initargs))))))
val))))
;;;; MAKE-CONDITION
(defun make-condition (thing &rest args)
#!+sb-doc
"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 (or (and (symbolp thing) (find-classoid thing nil))
thing))
(class (typecase thing
(condition-classoid thing)
(classoid
(error 'simple-type-error
:datum thing
:expected-type 'condition-class
:format-control "~S is not a condition class."
:format-arguments (list thing)))
(t
(error 'simple-type-error
:datum thing
:expected-type 'condition-class
:format-control "bad thing for class argument:~% ~S"
:format-arguments (list thing)))))
(res (make-condition-object args)))
(setf (%instance-layout res) (classoid-layout class))
;; Set any class slots with initargs present in this call.
(dolist (cslot (condition-classoid-class-slots class))
(dolist (initarg (condition-slot-initargs cslot))
(let ((val (getf args initarg *empty-condition-slot*)))
(unless (eq val *empty-condition-slot*)
(setf (car (condition-slot-cell cslot)) val)))))
;; Default any slots with non-constant defaults now.
(dolist (hslot (condition-classoid-hairy-slots class))
(when (dolist (initarg (condition-slot-initargs hslot) t)
(unless (eq (getf args initarg *empty-condition-slot*)
*empty-condition-slot*)
(return nil)))
(setf (getf (condition-assigned-slots res) (condition-slot-name hslot))
(find-slot-default class hslot))))
res))
;;;; DEFINE-CONDITION
(eval-when (:compile-toplevel :load-toplevel :execute)
(defun %compiler-define-condition (name direct-supers layout
all-readers all-writers)
(with-single-package-locked-error
(:symbol name "defining ~A as a condition")
(sb!xc:proclaim `(ftype (function (t) t) ,@all-readers))
(sb!xc:proclaim `(ftype (function (t t) t) ,@all-writers))
(multiple-value-bind (class old-layout)
(insured-find-classoid name
#'condition-classoid-p
#'make-condition-classoid)
(setf (layout-classoid layout) class)
(setf (classoid-direct-superclasses class)
(mapcar #'find-classoid direct-supers))
(cond ((not old-layout)
(register-layout layout))
((not *type-system-initialized*)
(setf (layout-classoid old-layout) class)
(setq layout old-layout)
(unless (eq (classoid-layout class) layout)
(register-layout layout)))
((redefine-layout-warning "current"
old-layout
"new"
(layout-length layout)
(layout-inherits layout)
(layout-depthoid layout)
(layout-n-untagged-slots layout))
(register-layout layout :invalidate t))
((not (classoid-layout class))
(register-layout layout)))
(setf (layout-info layout)
(locally
;; KLUDGE: There's a FIND-CLASS DEFTRANSFORM for constant class
;; names which creates fast but non-cold-loadable, non-compact
;; code. In this context, we'd rather have compact, cold-loadable
;; code. -- WHN 19990928
(declare (notinline find-classoid))
(layout-info (classoid-layout (find-classoid 'condition)))))
(setf (find-classoid name) class)
;; Initialize CPL slot.
(setf (condition-classoid-cpl class)
(remove-if-not #'condition-classoid-p
(std-compute-class-precedence-list class)))))
(values))
) ; EVAL-WHEN
;;; Compute the effective slots of CLASS, copying inherited slots and
;;; destructively modifying direct slots.
;;;
;;; FIXME: It'd be nice to explain why it's OK to destructively modify
;;; direct slots. Presumably it follows from the semantics of
;;; inheritance and redefinition of conditions, but finding the cite
;;; and documenting it here would be good. (Or, if this is not in fact
;;; ANSI-compliant, fixing it would also be good.:-)
(defun compute-effective-slots (class)
(collect ((res (copy-list (condition-classoid-slots class))))
(dolist (sclass (cdr (condition-classoid-cpl class)))
(dolist (sslot (condition-classoid-slots sclass))
(let ((found (find (condition-slot-name sslot) (res)
:key #'condition-slot-name)))
(cond (found
(setf (condition-slot-initargs found)
(union (condition-slot-initargs found)
(condition-slot-initargs sslot)))
(unless (condition-slot-initform-p found)
(setf (condition-slot-initform-p found)
(condition-slot-initform-p sslot))
(setf (condition-slot-initform found)
(condition-slot-initform sslot)))
(unless (condition-slot-allocation found)
(setf (condition-slot-allocation found)
(condition-slot-allocation sslot))))
(t
(res (copy-structure sslot)))))))
(res)))
;;; Early definitions of slot accessor creators.
;;;
;;; Slot accessors must be generic functions, but ANSI does not seem
;;; to specify any of them, and we cannot support it before end of
;;; warm init. So we use ordinary functions inside SBCL, and switch to
;;; GFs only at the end of building.
(declaim (notinline install-condition-slot-reader
install-condition-slot-writer))
(defun install-condition-slot-reader (name condition slot-name)
(declare (ignore condition))
(setf (fdefinition name)
(lambda (condition)
(condition-reader-function condition slot-name))))
(defun install-condition-slot-writer (name condition slot-name)
(declare (ignore condition))
(setf (fdefinition name)
(lambda (new-value condition)
(condition-writer-function condition new-value slot-name))))
(defun %define-condition (name parent-types layout slots documentation
report default-initargs all-readers all-writers)
(with-single-package-locked-error
(:symbol name "defining ~A as a condition")
(%compiler-define-condition name parent-types layout all-readers all-writers)
(let ((class (find-classoid name)))
(setf (condition-classoid-slots class) slots)
(setf (condition-classoid-report class) report)
(setf (condition-classoid-default-initargs class) default-initargs)
(setf (fdocumentation name 'type) documentation)
(dolist (slot slots)
;; Set up reader and writer functions.
(let ((slot-name (condition-slot-name slot)))
(dolist (reader (condition-slot-readers slot))
(install-condition-slot-reader reader name slot-name))
(dolist (writer (condition-slot-writers slot))
(install-condition-slot-writer writer name slot-name))))
;; Compute effective slots and set up the class and hairy slots
;; (subsets of the effective slots.)
(let ((eslots (compute-effective-slots class))
(e-def-initargs
(reduce #'append
(mapcar #'condition-classoid-default-initargs
(condition-classoid-cpl class)))))
(dolist (slot eslots)
(ecase (condition-slot-allocation slot)
(:class
(unless (condition-slot-cell slot)
(setf (condition-slot-cell slot)
(list (if (condition-slot-initform-p slot)
(let ((initform (condition-slot-initform slot)))
(if (functionp initform)
(funcall initform)
initform))
*empty-condition-slot*))))
(push slot (condition-classoid-class-slots class)))
((:instance nil)
(setf (condition-slot-allocation slot) :instance)
(when (or (functionp (condition-slot-initform slot))
(dolist (initarg (condition-slot-initargs slot) nil)
(when (functionp (getf e-def-initargs initarg))
(return t))))
(push slot (condition-classoid-hairy-slots class))))))))
name))
(defmacro define-condition (name (&rest parent-types) (&rest slot-specs)
&body options)
#!+sb-doc
"DEFINE-CONDITION Name (Parent-Type*) (Slot-Spec*) Option*
Define NAME as a condition type. This new type inherits slots and its
report function from the specified PARENT-TYPEs. A slot spec is a list of:
(slot-name :reader <rname> :initarg <iname> {Option Value}*
The DEFINE-CLASS slot options :ALLOCATION, :INITFORM, [slot] :DOCUMENTATION
and :TYPE and the overall options :DEFAULT-INITARGS and
[type] :DOCUMENTATION are also allowed.
The :REPORT option is peculiar to DEFINE-CONDITION. Its argument is either
a string or a two-argument lambda or function name. If a function, the
function is called with the condition and stream to report the condition.
If a string, the string is printed.
Condition types are classes, but (as allowed by ANSI and not as described in
CLtL2) are neither STANDARD-OBJECTs nor STRUCTURE-OBJECTs. WITH-SLOTS and
SLOT-VALUE may not be used on condition objects."
(let* ((parent-types (or parent-types '(condition)))
(layout (find-condition-layout name parent-types))
(documentation nil)
(report nil)
(default-initargs ()))
(collect ((slots)
(all-readers nil append)
(all-writers nil append))
(dolist (spec slot-specs)
(when (keywordp spec)
(warn "Keyword slot name indicates probable syntax error:~% ~S"
spec))
(let* ((spec (if (consp spec) spec (list spec)))
(slot-name (first spec))
(allocation :instance)
(initform-p nil)
documentation
initform)
(collect ((initargs)
(readers)
(writers))
(do ((options (rest spec) (cddr options)))
((null options))
(unless (and (consp options) (consp (cdr options)))
(error "malformed condition slot spec:~% ~S." spec))
(let ((arg (second options)))
(case (first options)
(:reader (readers arg))
(:writer (writers arg))
(:accessor
(readers arg)
(writers `(setf ,arg)))
(:initform
(when initform-p
(error "more than one :INITFORM in ~S" spec))
(setq initform-p t)
(setq initform arg))
(:initarg (initargs arg))
(:allocation
(setq allocation arg))
(:documentation
(when documentation
(error "more than one :DOCUMENTATION in ~S" spec))
(unless (stringp arg)
(error "slot :DOCUMENTATION argument is not a string: ~S"
arg))
(setq documentation arg))
(:type)
(t
(error "unknown slot option:~% ~S" (first options))))))
(all-readers (readers))
(all-writers (writers))
(slots `(make-condition-slot
:name ',slot-name
:initargs ',(initargs)
:readers ',(readers)
:writers ',(writers)
:initform-p ',initform-p
:documentation ',documentation
:initform
,(if (constantp initform)
`',(eval initform)
`#'(lambda () ,initform)))))))
(dolist (option options)
(unless (consp option)
(error "bad option:~% ~S" option))
(case (first option)
(:documentation (setq documentation (second option)))
(:report
(let ((arg (second option)))
(setq report
(if (stringp arg)
`#'(lambda (condition stream)
(declare (ignore condition))
(write-string ,arg stream))
`#'(lambda (condition stream)
(funcall #',arg condition stream))))))
(:default-initargs
(do ((initargs (rest option) (cddr initargs)))
((endp initargs))
(let ((val (second initargs)))
(setq default-initargs
(list* `',(first initargs)
(if (constantp val)
`',(eval val)
`#'(lambda () ,val))
default-initargs)))))
(t
(error "unknown option: ~S" (first option)))))
`(progn
(eval-when (:compile-toplevel)
(%compiler-define-condition ',name ',parent-types ',layout
',(all-readers) ',(all-writers)))
(eval-when (:load-toplevel :execute)
(%define-condition ',name
',parent-types
',layout
(list ,@(slots))
,documentation
,report
(list ,@default-initargs)
',(all-readers)
',(all-writers)))))))
;;;; DESCRIBE on CONDITIONs
;;; a function to be used as the guts of DESCRIBE-OBJECT (CONDITION T)
;;; eventually (once we get CLOS up and running so that we can define
;;; methods)
(defun describe-condition (condition stream)
(format stream
"~&~@<~S ~_is a ~S. ~_Its slot values are ~_~S.~:>~%"
condition
(type-of condition)
(concatenate 'list
(condition-actual-initargs condition)
(condition-assigned-slots condition))))
;;;; various CONDITIONs specified by ANSI
(define-condition serious-condition (condition) ())
(define-condition error (serious-condition) ())
(define-condition warning (condition) ())
(define-condition style-warning (warning) ())
(defun simple-condition-printer (condition stream)
(apply #'format
stream
(simple-condition-format-control condition)
(simple-condition-format-arguments condition)))
(define-condition simple-condition ()
((format-control :reader simple-condition-format-control
:initarg :format-control
:type format-control)
(format-arguments :reader simple-condition-format-arguments
:initarg :format-arguments
:initform '()
:type list))
(:report simple-condition-printer))
(define-condition simple-warning (simple-condition warning) ())
(define-condition simple-error (simple-condition error) ())
;;; not specified by ANSI, but too useful not to have around.
(define-condition simple-style-warning (simple-condition style-warning) ())
(define-condition storage-condition (serious-condition) ())
(define-condition type-error (error)
((datum :reader type-error-datum :initarg :datum)
(expected-type :reader type-error-expected-type :initarg :expected-type))
(:report
(lambda (condition stream)
(format stream
"~@<The value ~2I~:_~S ~I~_is not of type ~2I~_~S.~:>"
(type-error-datum condition)
(type-error-expected-type condition)))))
(define-condition simple-type-error (simple-condition type-error) ())
(define-condition program-error (error) ())
(define-condition parse-error (error) ())
(define-condition control-error (error) ())
(define-condition stream-error (error)
((stream :reader stream-error-stream :initarg :stream)))
(define-condition end-of-file (stream-error) ()
(:report
(lambda (condition stream)
(format stream
"end of file on ~S"
(stream-error-stream condition)))))
(define-condition file-error (error)
((pathname :reader file-error-pathname :initarg :pathname))
(:report
(lambda (condition stream)
(format stream "error on file ~S" (file-error-pathname condition)))))
(define-condition package-error (error)
((package :reader package-error-package :initarg :package)))
(define-condition cell-error (error)
((name :reader cell-error-name :initarg :name)))
(define-condition unbound-variable (cell-error) ()
(:report
(lambda (condition stream)
(format stream
"The variable ~S is unbound."
(cell-error-name condition)))))
(define-condition undefined-function (cell-error) ()
(:report
(lambda (condition stream)
(format stream
"The function ~S is undefined."
(cell-error-name condition)))))
(define-condition special-form-function (undefined-function) ()
(:report
(lambda (condition stream)
(format stream
"Cannot FUNCALL the SYMBOL-FUNCTION of special operator ~S."
(cell-error-name condition)))))
(define-condition arithmetic-error (error)
((operation :reader arithmetic-error-operation
:initarg :operation
:initform nil)
(operands :reader arithmetic-error-operands
:initarg :operands))
(:report (lambda (condition stream)
(format stream
"arithmetic error ~S signalled"
(type-of condition))
(when (arithmetic-error-operation condition)
(format stream
"~%Operation was ~S, operands ~S."
(arithmetic-error-operation condition)
(arithmetic-error-operands condition))))))
(define-condition division-by-zero (arithmetic-error) ())
(define-condition floating-point-overflow (arithmetic-error) ())
(define-condition floating-point-underflow (arithmetic-error) ())
(define-condition floating-point-inexact (arithmetic-error) ())
(define-condition floating-point-invalid-operation (arithmetic-error) ())
(define-condition print-not-readable (error)
((object :reader print-not-readable-object :initarg :object))
(:report
(lambda (condition stream)
(let ((obj (print-not-readable-object condition))
(*print-array* nil))
(format stream "~S cannot be printed readably." obj)))))
(define-condition reader-error (parse-error stream-error)
((format-control
:reader reader-error-format-control
:initarg :format-control)
(format-arguments
:reader reader-error-format-arguments
:initarg :format-arguments
:initform '()))
(:report
(lambda (condition stream)
(let* ((error-stream (stream-error-stream condition))
(pos (file-position-or-nil-for-error error-stream)))
(let (lineno colno)
(when (and pos
(< pos sb!xc:array-dimension-limit)
;; KLUDGE: lseek() (which is what FILE-POSITION
;; reduces to on file-streams) is undefined on
;; "some devices", which in practice means that it
;; can claim to succeed on /dev/stdin on Darwin
;; and Solaris. This is obviously bad news,
;; because the READ-SEQUENCE below will then
;; block, not complete, and the report will never
;; be printed. As a workaround, we exclude
;; interactive streams from this attempt to report
;; positions. -- CSR, 2003-08-21
(not (interactive-stream-p error-stream))
(file-position error-stream :start))
(let ((string
(make-string pos
: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-or-nil-for-error error-stream pos))
(format stream
"READER-ERROR ~@[at ~W ~]~
~@[(line ~W~]~@[, column ~W) ~]~
on ~S:~%~?"
pos lineno colno error-stream
(reader-error-format-control condition)
(reader-error-format-arguments condition)))))))
;;;; special SBCL extension conditions
;;; an error apparently caused by a bug in SBCL itself
;;;
;;; Note that we don't make any serious effort to use this condition
;;; for *all* errors in SBCL itself. E.g. type errors and array
;;; indexing errors can occur in functions called from SBCL code, and
;;; will just end up as ordinary TYPE-ERROR or invalid index error,
;;; because the signalling code has no good way to know that the
;;; underlying problem is a bug in SBCL. But in the fairly common case
;;; that the signalling code does know that it's found a bug in SBCL,
;;; this condition is appropriate, reusing boilerplate and helping
;;; users to recognize it as an SBCL bug.
(define-condition bug (simple-error)
()
(:report
(lambda (condition stream)
(format stream
"~@< ~? ~:@_~?~:>"
(simple-condition-format-control condition)
(simple-condition-format-arguments condition)
"~@<This is probably a bug in SBCL itself. (Alternatively, ~
SBCL might have been corrupted by bad user code, e.g. by an ~
undefined Lisp operation like ~S, or by stray pointers from ~
alien code or from unsafe Lisp code; or there might be a bug ~
in the OS or hardware that SBCL is running on.) If it seems to ~
be a bug in SBCL itself, the maintainers would like to know ~
about it. Bug reports are welcome on the SBCL ~
mailing lists, which you can find at ~
<http://sbcl.sourceforge.net/>.~:@>"
'((fmakunbound 'compile))))))
(define-condition simple-storage-condition (storage-condition simple-condition) ())
;;; a condition for use in stubs for operations which aren't supported
;;; on some platforms
;;;
;;; E.g. in sbcl-0.7.0.5, it might be appropriate to do something like
;;; #-(or freebsd linux)
;;; (defun load-foreign (&rest rest)
;;; (error 'unsupported-operator :name 'load-foreign))
;;; #+(or freebsd linux)
;;; (defun load-foreign ... actual definition ...)
;;; By signalling a standard condition in this case, we make it
;;; possible for test code to distinguish between (1) intentionally
;;; unimplemented and (2) unintentionally just screwed up somehow.
;;; (Before this condition was defined, test code tried to deal with
;;; this by checking for FBOUNDP, but that didn't work reliably. In
;;; sbcl-0.7.0, a a package screwup left the definition of
;;; LOAD-FOREIGN in the wrong package, so it was unFBOUNDP even on
;;; architectures where it was supposed to be supported, and the
;;; regression tests cheerfully passed because they assumed that
;;; unFBOUNDPness meant they were running on an system which didn't
;;; support the extension.)
(define-condition unsupported-operator (simple-error) ())
;;; (:ansi-cl :function remove)
;;; (:ansi-cl :section (a b c))
;;; (:ansi-cl :glossary "similar")
;;;
;;; (:sbcl :node "...")
;;; (:sbcl :variable *ed-functions*)
;;;
;;; FIXME: this is not the right place for this.
(defun print-reference (reference stream)
(ecase (car reference)
(:amop
(format stream "AMOP")
(format stream ", ")
(destructuring-bind (type data) (cdr reference)
(ecase type
(:generic-function (format stream "Generic Function ~S" data))
(:section (format stream "Section ~{~D~^.~}" data)))))
(:ansi-cl
(format stream "The ANSI Standard")
(format stream ", ")
(destructuring-bind (type data) (cdr reference)
(ecase type
(:function (format stream "Function ~S" data))
(:special-operator (format stream "Special Operator ~S" data))
(:macro (format stream "Macro ~S" data))
(:section (format stream "Section ~{~D~^.~}" data))
(:glossary (format stream "Glossary entry for ~S" data))
(:issue (format stream "writeup for Issue ~A" data)))))
(:sbcl
(format stream "The SBCL Manual")
(format stream ", ")
(destructuring-bind (type data) (cdr reference)
(ecase type
(:node (format stream "Node ~S" data))
(:variable (format stream "Variable ~S" data))
(:function (format stream "Function ~S" data)))))
;; FIXME: other documents (e.g. CLIM, Franz documentation :-)
))
(define-condition reference-condition ()
((references :initarg :references :reader reference-condition-references)))
(defvar *print-condition-references* t)
(def!method print-object :around ((o reference-condition) s)
(call-next-method)
(unless (or *print-escape* *print-readably*)
(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))
(r (car rs) (car rs)))
((null rs))
(print-reference r s)
(unless (null (cdr rs))
(terpri s)))))))
(define-condition duplicate-definition (reference-condition warning)
((name :initarg :name :reader duplicate-definition-name))
(:report (lambda (c s)
(format s "~@<Duplicate definition for ~S found in ~
one file.~@:>"
(duplicate-definition-name c))))
(:default-initargs :references (list '(:ansi-cl :section (3 2 2 3)))))
(define-condition package-at-variance (reference-condition simple-warning)
()
(:default-initargs :references (list '(:ansi-cl :macro defpackage))))
(define-condition defconstant-uneql (reference-condition error)
((name :initarg :name :reader defconstant-uneql-name)
(old-value :initarg :old-value :reader defconstant-uneql-old-value)
(new-value :initarg :new-value :reader defconstant-uneql-new-value))
(:report
(lambda (condition stream)
(format stream
"~@<The constant ~S is being redefined (from ~S to ~S)~@:>"
(defconstant-uneql-name condition)
(defconstant-uneql-old-value condition)
(defconstant-uneql-new-value condition))))
(:default-initargs :references (list '(:ansi-cl :macro defconstant)
'(:sbcl :node "Idiosyncrasies"))))
(define-condition array-initial-element-mismatch
(reference-condition simple-warning)
()
(:default-initargs
:references (list
'(:ansi-cl :function make-array)
'(:ansi-cl :function sb!xc:upgraded-array-element-type))))
(define-condition displaced-to-array-too-small-error
(reference-condition simple-error)
()
(:default-initargs
:references (list '(:ansi-cl :function adjust-array))))
(define-condition type-warning (reference-condition simple-warning)
()
(:default-initargs :references (list '(:sbcl :node "Handling of Types"))))
(define-condition local-argument-mismatch (reference-condition simple-warning)
()
(:default-initargs :references (list '(:ansi-cl :section (3 2 2 3)))))
(define-condition format-args-mismatch (reference-condition)
()
(:default-initargs :references (list '(:ansi-cl :section (22 3 10 2)))))
(define-condition format-too-few-args-warning
(format-args-mismatch simple-warning)
())
(define-condition format-too-many-args-warning
(format-args-mismatch simple-style-warning)
())
(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
(define-condition package-lock-violation (reference-condition package-error)
((format-control :initform nil :initarg :format-control
:reader package-error-format-control)
(format-arguments :initform nil :initarg :format-arguments
:reader package-error-format-arguments))
(:report
(lambda (condition stream)
(let ((control (package-error-format-control condition)))
(if control
(apply #'format stream
(format nil "~~@<Lock on package ~A violated when ~A.~~:@>"
(package-name (package-error-package condition))
control)
(package-error-format-arguments condition))
(format stream "~@<Lock on package ~A violated.~:@>"
(package-name (package-error-package condition)))))))
;; no :default-initargs -- reference-stuff provided by the
;; signalling form in target-package.lisp
#!+sb-doc
(:documentation
"Subtype of CL:PACKAGE-ERROR. A subtype of this error is signalled
when a package-lock is violated."))
(define-condition package-locked-error (package-lock-violation) ()
#!+sb-doc
(:documentation
"Subtype of SB-EXT:PACKAGE-LOCK-VIOLATION. An error of this type is
signalled when an operation on a package violates a package lock."))
(define-condition symbol-package-locked-error (package-lock-violation)
((symbol :initarg :symbol :reader package-locked-error-symbol))
#!+sb-doc
(:documentation
"Subtype of SB-EXT:PACKAGE-LOCK-VIOLATION. An error of this type is
signalled when an operation on a symbol violates a package lock. The
symbol that caused the violation is accessed by the function
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."))))
;;;; various other (not specified by ANSI) CONDITIONs
;;;;
;;;; These might logically belong in other files; they're here, after
;;;; setup of CONDITION machinery, only because that makes it easier to
;;;; get cold init to work.
;;; OAOOM warning: see cross-condition.lisp
(define-condition encapsulated-condition (condition)
((condition :initarg :condition :reader encapsulated-condition)))
(define-condition values-type-error (type-error)
()
(:report
(lambda (condition stream)
(format stream
"~@<The values set ~2I~:_[~{~S~^ ~}] ~I~_is not of type ~2I~_~S.~:>"
(type-error-datum condition)
(type-error-expected-type condition)))))
;;; KLUDGE: a condition for floating point errors when we can't or
;;; won't figure out what type they are. (In FreeBSD and OpenBSD we
;;; don't know how, at least as of sbcl-0.6.7; in Linux we probably
;;; know how but the old code was broken by the conversion to POSIX
;;; signal handling and hasn't been fixed as of sbcl-0.6.7.)
;;;
;;; FIXME: Perhaps this should also be a base class for all
;;; floating point exceptions?
(define-condition floating-point-exception (arithmetic-error)
((flags :initarg :traps
:initform nil
:reader floating-point-exception-traps))
(:report (lambda (condition stream)
(format stream
"An arithmetic error ~S was signalled.~%"
(type-of condition))
(let ((traps (floating-point-exception-traps condition)))
(if traps
(format stream
"Trapping conditions are: ~%~{ ~S~^~}~%"
traps)
(write-line
"No traps are enabled? How can this be?"
stream))))))
(define-condition index-too-large-error (type-error)
()
(:report
(lambda (condition stream)
(format stream
"The index ~S is too large."
(type-error-datum condition)))))
(define-condition bounding-indices-bad-error (reference-condition type-error)
((object :reader bounding-indices-bad-object :initarg :object))
(:report
(lambda (condition stream)
(let* ((datum (type-error-datum condition))
(start (car datum))
(end (cdr datum))
(object (bounding-indices-bad-object condition)))
(etypecase object
(sequence
(format stream
"The bounding indices ~S and ~S are bad ~
for a sequence of length ~S."
start end (length object)))
(array
;; from WITH-ARRAY-DATA
(format stream
"The START and END parameters ~S and ~S are ~
bad for an array of total size ~S."
start end (array-total-size object)))))))
(:default-initargs
:references
(list '(:ansi-cl :glossary "bounding index designator")
'(:ansi-cl :issue "SUBSEQ-OUT-OF-BOUNDS:IS-AN-ERROR"))))
(define-condition nil-array-accessed-error (reference-condition type-error)
()
(:report (lambda (condition stream)
(declare (ignore condition))
(format stream
"An attempt to access an array of element-type ~
NIL was made. Congratulations!")))
(:default-initargs
:references (list '(:ansi-cl :function sb!xc:upgraded-array-element-type)
'(:ansi-cl :section (15 1 2 1))
'(:ansi-cl :section (15 1 2 2)))))
(define-condition io-timeout (stream-error)
((direction :reader io-timeout-direction :initarg :direction))
(:report
(lambda (condition stream)
(declare (type stream stream))
(format stream
"I/O timeout ~(~A~)ing ~S"
(io-timeout-direction condition)
(stream-error-stream condition)))))
(define-condition namestring-parse-error (parse-error)
((complaint :reader namestring-parse-error-complaint :initarg :complaint)
(args :reader namestring-parse-error-args :initarg :args :initform nil)
(namestring :reader namestring-parse-error-namestring :initarg :namestring)
(offset :reader namestring-parse-error-offset :initarg :offset))
(:report
(lambda (condition stream)
(format stream
"parse error in namestring: ~?~% ~A~% ~V@T^"
(namestring-parse-error-complaint condition)
(namestring-parse-error-args condition)
(namestring-parse-error-namestring condition)
(namestring-parse-error-offset condition)))))
(define-condition simple-package-error (simple-condition package-error) ())
(define-condition reader-package-error (reader-error) ())
(define-condition reader-eof-error (end-of-file)
((context :reader reader-eof-error-context :initarg :context))
(:report
(lambda (condition stream)
(format stream
"unexpected end of file on ~S ~A"
(stream-error-stream condition)
(reader-eof-error-context condition)))))
(define-condition reader-impossible-number-error (reader-error)
((error :reader reader-impossible-number-error-error :initarg :error))
(:report
(lambda (condition stream)
(let ((error-stream (stream-error-stream condition)))
(format stream "READER-ERROR ~@[at ~W ~]on ~S:~%~?~%Original error: ~A"
(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))))))
(define-condition timeout (serious-condition) ())
(define-condition declaration-type-conflict-error (reference-condition
simple-error)
()
(:default-initargs
:format-control "symbol ~S cannot be both the name of a type and the name of a declaration"
:references (list '(:ansi-cl :section (3 8 21)))))
;;; Single stepping conditions
(define-condition step-condition ()
((form :initarg :form :reader step-condition-form))
#!+sb-doc
(:documentation "Common base class of single-stepping conditions.
STEP-CONDITION-FORM holds a string representation of the form being
stepped."))
#!+sb-doc
(setf (fdocumentation 'step-condition-form 'function)
"Form associated with the STEP-CONDITION.")
(define-condition step-form-condition (step-condition)
((source-path :initarg :source-path :reader step-condition-source-path)
(pathname :initarg :pathname :reader step-condition-pathname))
#!+sb-doc
(:documentation "Condition signalled by code compiled with
single-stepping information when about to execute a form.
STEP-CONDITION-FORM holds the form, STEP-CONDITION-PATHNAME holds the
pathname of the original file or NIL, and STEP-CONDITION-SOURCE-PATH
holds the source-path to the original form within that file or NIL.
Associated with this condition are always the restarts STEP-INTO,
STEP-NEXT, and STEP-CONTINUE."))
#!+sb-doc
(setf (fdocumentation 'step-condition-source-path 'function)
"Source-path of the original form associated with the
STEP-FORM-CONDITION or NIL."
(fdocumentation 'step-condition-pathname 'function)
"Pathname of the original source-file associated with the
STEP-FORM-CONDITION or NIL.")
(define-condition step-result-condition (step-condition)
((result :initarg :result :reader step-condition-result)))
#!+sb-doc
(setf (fdocumentation 'step-condition-result 'function)
"Return values associated with STEP-VALUES-CONDITION as a list,
or the variable value associated with STEP-VARIABLE-CONDITION.")
(define-condition step-values-condition (step-result-condition)
()
#!+sb-doc
(:documentation "Condition signalled by code compiled with
single-stepping information after executing a form.
STEP-CONDITION-FORM holds the form, and STEP-CONDITION-RESULT holds
the values returned by the form as a list. No associated restarts."))
(define-condition step-variable-condition (step-result-condition)
()
#!+sb-doc
(:documentation "Condition signalled by code compiled with
single-stepping information when referencing a variable.
STEP-CONDITION-FORM hold the symbol, and STEP-CONDITION-RESULT holds
the value of the variable. No associated restarts."))
;;;; restart definitions
(define-condition abort-failure (control-error) ()
(:report
"An ABORT restart was found that failed to transfer control dynamically."))
(defun abort (&optional condition)
#!+sb-doc
"Transfer control to a restart named ABORT, signalling a CONTROL-ERROR if
none exists."
(invoke-restart (find-restart-or-control-error 'abort condition))
;; ABORT signals an error in case there was a restart named ABORT
;; that did not transfer control dynamically. This could happen with
;; RESTART-BIND.
(error 'abort-failure))
(defun muffle-warning (&optional condition)
#!+sb-doc
"Transfer control to a restart named MUFFLE-WARNING, signalling a
CONTROL-ERROR if none exists."
(invoke-restart (find-restart-or-control-error 'muffle-warning condition)))
(macrolet ((define-nil-returning-restart (name args doc)
#!-sb-doc (declare (ignore doc))
`(defun ,name (,@args &optional condition)
#!+sb-doc ,doc
;; FIXME: Perhaps this shared logic should be pulled out into
;; FLET MAYBE-INVOKE-RESTART? See whether it shrinks code..
(let ((restart (find-restart ',name condition)))
(when restart
(invoke-restart restart ,@args))))))
(define-nil-returning-restart continue ()
"Transfer control to a restart named CONTINUE, or return NIL if none exists.")
(define-nil-returning-restart store-value (value)
"Transfer control and VALUE to a restart named STORE-VALUE, or return NIL if
none exists.")
(define-nil-returning-restart use-value (value)
"Transfer control and VALUE to a restart named USE-VALUE, or return NIL if
none exists."))
;;; single-stepping restarts
(macrolet ((def (name doc)
#!-sb-doc (declare (ignore doc))
`(defun ,name (condition)
#!+sb-doc ,doc
(invoke-restart (find-restart-or-control-error ',name condition)))))
(def step-continue
"Transfers control to the STEP-CONTINUE restart associated with
the condition, continuing execution without stepping. Signals a
CONTROL-ERROR if the restart does not exist.")
(def step-next
"Transfers control to the STEP-NEXT restart associated with the
condition, executing the current form without stepping and continuing
stepping with the next form. Signals CONTROL-ERROR is the restart does
not exists.")
(def step-into
"Transfers control to the STEP-INTO restart associated with the
condition, stepping into the current form. Signals a CONTROL-ERROR is
the restart does not exist."))
(/show0 "condition.lisp end of file")