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;;;; functions and macros to define and deal with internal errors
;;;; (i.e. problems that can be signaled from assembler code)
;;;; 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")
;;;; internal errors
(defvar *internal-errors*
#.(map 'vector #'cdr sb!c:*backend-internal-errors*))
(eval-when (:compile-toplevel :execute)
(sb!xc:defmacro deferr (name args &rest body)
(let* ((rest-pos (position '&rest args))
(required (if rest-pos (subseq args 0 rest-pos) args))
(fn-name (symbolicate name "-HANDLER")))
(with-unique-names (fp context sc-offsets)
`(progn
;; FIXME: Having a separate full DEFUN for each error doesn't
;; seem to add much value, and it takes a lot of space. Perhaps
;; we could do this dispatch with a big CASE statement instead?
(defun ,fn-name (name ,fp ,context ,sc-offsets)
;; FIXME: It would probably be good to do *STACK-TOP-HINT*
;; tricks to hide this internal error-handling logic from the
;; poor high level user, so his debugger tells him about
;; where his error was detected instead of telling him where
;; he ended up inside the system error-handling logic.
(declare (ignorable name ,fp ,context ,sc-offsets))
(let (,@(let ((offset -1))
(mapcar (lambda (var)
`(,var (sb!di::sub-access-debug-var-slot
,fp
(nth ,(incf offset)
,sc-offsets)
,context)))
required))
,@(when rest-pos
`((,(nth (1+ rest-pos) args)
(mapcar (lambda (sc-offset)
(sb!di::sub-access-debug-var-slot
,fp
sc-offset
,context))
(nthcdr ,rest-pos ,sc-offsets))))))
,@body))
(setf (svref *internal-errors* ,(error-number-or-lose name))
#',fn-name)))))
) ; EVAL-WHEN
(deferr unknown-error (&rest args)
(error "unknown error:~{ ~S~})" args))
(deferr object-not-fun-error (object)
(error 'type-error
:datum object
:expected-type 'function))
(deferr object-not-list-error (object)
(error 'type-error
:datum object
:expected-type 'list))
(deferr object-not-bignum-error (object)
(error 'type-error
:datum object
:expected-type 'bignum))
(deferr object-not-ratio-error (object)
(error 'type-error
:datum object
:expected-type 'ratio))
(deferr object-not-single-float-error (object)
(error 'type-error
:datum object
:expected-type 'single-float))
(deferr object-not-double-float-error (object)
(error 'type-error
:datum object
:expected-type 'double-float))
#!+long-float
(deferr object-not-long-float-error (object)
(error 'type-error
:datum object
:expected-type 'long-float))
(deferr object-not-simple-string-error (object)
(error 'type-error
:datum object
:expected-type 'simple-string))
(deferr object-not-fixnum-error (object)
(error 'type-error
:datum object
:expected-type 'fixnum))
(deferr object-not-vector-error (object)
(error 'type-error
:datum object
:expected-type 'vector))
(deferr object-not-string-error (object)
(error 'type-error
:datum object
:expected-type 'string))
(deferr object-not-base-string-error (object)
(error 'type-error
:datum object
:expected-type 'base-string))
(deferr object-not-vector-nil-error (object)
(error 'type-error
:datum object
:expected-type '(vector nil)))
#!+sb-unicode
(deferr object-not-character-string-error (object)
(error 'type-error
:datum object
:expected-type '(vector character)))
(deferr object-not-bit-vector-error (object)
(error 'type-error
:datum object
:expected-type 'bit-vector))
(deferr object-not-array-error (object)
(error 'type-error
:datum object
:expected-type 'array))
(deferr object-not-number-error (object)
(error 'type-error
:datum object
:expected-type 'number))
(deferr object-not-rational-error (object)
(error 'type-error
:datum object
:expected-type 'rational))
(deferr object-not-float-error (object)
(error 'type-error
:datum object
:expected-type 'float))
(deferr object-not-real-error (object)
(error 'type-error
:datum object
:expected-type 'real))
(deferr object-not-integer-error (object)
(error 'type-error
:datum object
:expected-type 'integer))
(deferr object-not-cons-error (object)
(error 'type-error
:datum object
:expected-type 'cons))
(deferr object-not-symbol-error (object)
(error 'type-error
:datum object
:expected-type 'symbol))
(deferr undefined-fun-error (fdefn-or-symbol)
(error 'undefined-function
:name (etypecase fdefn-or-symbol
(symbol fdefn-or-symbol)
(fdefn (fdefn-name fdefn-or-symbol)))))
(deferr invalid-arg-count-error (nargs)
(error 'simple-program-error
:format-control "invalid number of arguments: ~S"
:format-arguments (list nargs)))
(deferr bogus-arg-to-values-list-error (list)
(error 'simple-type-error
:datum list
:expected-type 'list
:format-control
"~@<attempt to use VALUES-LIST on a dotted list: ~2I~_~S~:>"
:format-arguments (list list)))
(deferr unbound-symbol-error (symbol)
(error 'unbound-variable :name symbol))
(deferr object-not-character-error (object)
(error 'type-error
:datum object
:expected-type 'character))
(deferr object-not-sap-error (object)
(error 'type-error
:datum object
:expected-type 'system-area-pointer))
(deferr invalid-unwind-error ()
(error 'simple-control-error
:format-control
"attempt to RETURN-FROM a block or GO to a tag that no longer exists"
))
(deferr unseen-throw-tag-error (tag)
(error 'simple-control-error
:format-control "attempt to THROW to a tag that does not exist: ~S"
:format-arguments (list tag)))
(deferr nil-fun-returned-error (function)
(error 'simple-control-error
:format-control
"A function with declared result type NIL returned:~% ~S"
:format-arguments (list function)))
(deferr nil-array-accessed-error (array)
(error 'nil-array-accessed-error
:datum array :expected-type '(not (array nil))))
(deferr division-by-zero-error (this that)
(error 'division-by-zero
:operation 'division
:operands (list this that)))
(deferr object-not-type-error (object type)
(if (invalid-array-p object)
(invalid-array-error object)
(error (if (and (%instancep object)
(layout-invalid (%instance-layout object)))
'layout-invalid
'type-error)
:datum object
:expected-type type)))
(deferr layout-invalid-error (object layout)
(error 'layout-invalid
:datum object
:expected-type (layout-classoid layout)))
(deferr odd-key-args-error ()
(error 'simple-program-error
:format-control "odd number of &KEY arguments"))
(deferr unknown-key-arg-error (key-name)
(error 'simple-program-error
:format-control "unknown &KEY argument: ~S"
:format-arguments (list key-name)))
(deferr invalid-array-index-error (array bound index)
(invalid-array-index-error array index bound))
(deferr object-not-simple-array-error (object)
(error 'type-error
:datum object
:expected-type 'simple-array))
(deferr object-not-signed-byte-32-error (object)
(error 'type-error
:datum object
:expected-type '(signed-byte 32)))
(deferr object-not-unsigned-byte-32-error (object)
(error 'type-error
:datum object
:expected-type '(unsigned-byte 32)))
(deferr tls-exhausted-error ()
;; There is nothing we can do about it. A number of entries in the
;; tls could be reserved and made available for recovery but since
;; tls indices are never reused it would be kind of silly and
;; without it signalling an error is more than likely to end in a
;; recursive error.
(%primitive print "Thread local storage exhausted.")
(sb!impl::%halt))
(macrolet
((define-simple-array-internal-errors ()
`(progn
,@(map 'list
(lambda (saetp)
`(deferr ,(symbolicate
"OBJECT-NOT-"
(sb!vm:saetp-primitive-type-name saetp)
"-ERROR")
(object)
(error 'type-error
:datum object
:expected-type '(simple-array
,(sb!vm:saetp-specifier saetp)
(*)))))
sb!vm:*specialized-array-element-type-properties*))))
(define-simple-array-internal-errors))
(deferr object-not-complex-error (object)
(error 'type-error
:datum object
:expected-type 'complex))
(deferr object-not-complex-rational-error (object)
(error 'type-error
:datum object
:expected-type '(complex rational)))
(deferr object-not-complex-single-float-error (object)
(error 'type-error
:datum object
:expected-type '(complex single-float)))
(deferr object-not-complex-double-float-error (object)
(error 'type-error
:datum object
:expected-type '(complex double-float)))
#!+long-float
(deferr object-not-complex-long-float-error (object)
(error 'type-error
:datum object
:expected-type '(complex long-float)))
#!+sb-simd-pack
(deferr object-not-simd-pack-error (object)
(error 'type-error
:datum object
:expected-type 'simd-pack))
(deferr object-not-weak-pointer-error (object)
(error 'type-error
:datum object
:expected-type 'weak-pointer))
(deferr object-not-instance-error (object)
(error 'type-error
:datum object
:expected-type 'instance))
(deferr object-not-complex-vector-error (object)
(error 'type-error
:datum object
:expected-type '(and vector (not simple-array))))
;;;; fetching errorful function name
;;; This flag is used to prevent infinite recursive lossage when
;;; we can't find the caller for some reason.
(defvar *finding-name* nil)
(defun find-caller-name-and-frame ()
(if *finding-name*
(values "<error finding caller name -- already finding name>" nil)
(handler-case
(let* ((*finding-name* t)
(frame (sb!di:frame-down (sb!di:frame-down (sb!di:top-frame))))
(name (sb!di:debug-fun-name
(sb!di:frame-debug-fun frame))))
(sb!di:flush-frames-above frame)
(values name frame))
(error ()
(values "<error finding caller name -- trapped error>" nil))
(sb!di:debug-condition ()
(values "<error finding caller name -- trapped debug-condition>"
nil)))))
(defun find-interrupted-name-and-frame ()
(/show0 "entering FIND-INTERRUPTED-NAME-AND-FRAME")
(if *finding-name*
(values "<error finding interrupted name -- already finding name>" nil)
(handler-case
(let ((*finding-name* t))
(/show0 "in ordinary case")
(do ((frame (sb!di:top-frame) (sb!di:frame-down frame)))
((null frame)
(/show0 "null frame")
(values "<error finding interrupted name -- null frame>" nil))
(/show0 "at head of DO loop")
(when (and (sb!di::compiled-frame-p frame)
(sb!di::compiled-frame-escaped frame))
(sb!di:flush-frames-above frame)
(/show0 "returning from within DO loop")
(return (values (sb!di:debug-fun-name
(sb!di:frame-debug-fun frame))
frame)))))
(error ()
(/show0 "trapped ERROR")
(values "<error finding interrupted name -- trapped error>" nil))
(sb!di:debug-condition ()
(/show0 "trapped DEBUG-CONDITION")
(values "<error finding interrupted name -- trapped debug-condition>"
nil)))))
(defun find-caller-of-named-frame (name)
(unless *finding-name*
(handler-case
(let ((*finding-name* t))
(do ((frame (sb!di:top-frame) (sb!di:frame-down frame)))
((null frame))
(when (and (sb!di::compiled-frame-p frame)
(eq name (sb!di:debug-fun-name
(sb!di:frame-debug-fun frame))))
(let ((caller (sb!di:frame-down frame)))
(sb!di:flush-frames-above caller)
(return caller)))))
((or error sb!di:debug-condition) ()
nil)
(sb!di:debug-condition ()
nil))))
;;;; INTERNAL-ERROR signal handler
(defun internal-error (context continuable)
(declare (type system-area-pointer context))
(declare (ignore continuable))
(/show0 "entering INTERNAL-ERROR, CONTEXT=..")
(/hexstr context)
(infinite-error-protect
(/show0 "about to bind ALIEN-CONTEXT")
(let* ((alien-context (locally
(declare (optimize (inhibit-warnings 3)))
(sb!alien:sap-alien context (* os-context-t))))
#!+c-stack-is-control-stack
(*saved-fp-and-pcs*
(cons (cons (%make-lisp-obj (sb!vm:context-register
alien-context
sb!vm::cfp-offset))
(sb!vm:context-pc alien-context))
(when (boundp '*saved-fp-and-pcs*)
*saved-fp-and-pcs*))))
(declare (truly-dynamic-extent *saved-fp-and-pcs*))
(/show0 "about to bind ERROR-NUMBER and ARGUMENTS")
(multiple-value-bind (error-number arguments)
(sb!vm:internal-error-args alien-context)
;; There's a limit to how much error reporting we can usefully
;; do before initialization is complete, but try to be a little
;; bit helpful before we die.
(/show0 "back from INTERNAL-ERROR-ARGS, ERROR-NUMBER=..")
(/hexstr error-number)
(/show0 "cold/low ARGUMENTS=..")
(/hexstr arguments)
(unless *cold-init-complete-p*
(%primitive print "can't recover from error in cold init, halting")
(%primitive sb!c:halt))
(with-interrupt-bindings
(multiple-value-bind (name sb!debug:*stack-top-hint*)
(find-interrupted-name-and-frame)
(/show0 "back from FIND-INTERRUPTED-NAME")
(let ((fp (int-sap (sb!vm:context-register alien-context
sb!vm::cfp-offset)))
(handler (and (< -1 error-number (length *internal-errors*))
(svref *internal-errors* error-number))))
(cond ((null handler)
(error 'simple-error
:format-control
"unknown internal error, ~D, args=~S"
:format-arguments
(list error-number
(mapcar (lambda (sc-offset)
(sb!di::sub-access-debug-var-slot
fp sc-offset alien-context))
arguments))))
((not (functionp handler))
(error 'simple-error
:format-control "internal error ~D: ~A; args=~S"
:format-arguments
(list error-number
handler
(mapcar (lambda (sc-offset)
(sb!di::sub-access-debug-var-slot
fp sc-offset alien-context))
arguments))))
(t
(funcall handler name fp alien-context arguments))))))))))
(defun control-stack-exhausted-error ()
(let ((sb!debug:*stack-top-hint* nil))
(infinite-error-protect
(format *error-output*
"Control stack guard page temporarily disabled: proceed with caution~%")
(error 'control-stack-exhausted))))
(defun binding-stack-exhausted-error ()
(let ((sb!debug:*stack-top-hint* nil))
(infinite-error-protect
(format *error-output*
"Binding stack guard page temporarily disabled: proceed with caution~%")
(error 'binding-stack-exhausted))))
(defun alien-stack-exhausted-error ()
(let ((sb!debug:*stack-top-hint* nil))
(infinite-error-protect
(format *error-output*
"Alien stack guard page temporarily disabled: proceed with caution~%")
(error 'alien-stack-exhausted))))
;;; KLUDGE: we keep a single HEAP-EXHAUSTED-ERROR object around, so
;;; that we don't need to allocate it when running out of
;;; memory. Similarly we pass the amounts in special variables as
;;; there may be multiple threads running into trouble at the same
;;; time. The condition is created by GC-REINIT.
(defvar *heap-exhausted-error-condition*)
(defvar *heap-exhausted-error-available-bytes*)
(defvar *heap-exhausted-error-requested-bytes*)
(defun heap-exhausted-error (available requested)
(infinite-error-protect
(let ((*heap-exhausted-error-available-bytes* available)
(*heap-exhausted-error-requested-bytes* requested))
(error *heap-exhausted-error-condition*))))
(defun undefined-alien-variable-error ()
(error 'undefined-alien-variable-error))
(defun undefined-alien-function-error ()
(error 'undefined-alien-function-error))
#!-win32
(define-alien-variable current-memory-fault-address unsigned)
#!-win32
(defun memory-fault-error ()
(error 'memory-fault-error
:address current-memory-fault-address))
;;; This is SIGTRAP / EXCEPTION_BREAKPOINT that runtime could not deal
;;; with. Prior to Windows we just had a Lisp side handler for
;;; SIGTRAP, but now we need to deal with this portably.
(defun unhandled-trap-error (context-sap)
(declare (type system-area-pointer context-sap))
(infinite-error-protect
(let ((context (sap-alien context-sap (* os-context-t))))
(error 'breakpoint-error
:context context
:address (sap-int (sb!vm:context-pc context))))))