d: (fixed in 0.8.1.5)
-7:
- The "compiling top-level form:" output ought to be condensed.
- Perhaps any number of such consecutive lines ought to turn into a
- single "compiling top-level forms:" line.
-
-19:
- (I *think* this is a bug. It certainly seems like strange behavior. But
- the ANSI spec is scary, dark, and deep.. -- WHN)
- (FORMAT NIL "~,1G" 1.4) => "1. "
- (FORMAT NIL "~3,1G" 1.4) => "1. "
-
27:
Sometimes (SB-EXT:QUIT) fails with
Argh! maximum interrupt nesting depth (4096) exceeded, exiting
Process inferior-lisp exited abnormally with code 1
I haven't noticed a repeatable case of this yet.
-32:
- The printer doesn't report closures very well. This is true in
- CMU CL 18b as well:
- (defstruct foo bar)
- (print #'foo-bar)
- gives
- #<FUNCTION "CLOSURE" {406974D5}>
- It would be nice to make closures have a settable name slot,
- and make things like DEFSTRUCT and FLET, which create closures,
- set helpful values into this slot.
-
33:
And as long as we're wishing, it would be awfully nice if INSPECT could
also report on closures, telling about the values of the bound variables.
+ Currently INSPECT and DESCRIBE do show the values, but showing the
+ names of the bindings would be even nicer.
+
35:
The compiler assumes that any time a function of declared FTYPE
doesn't signal an error, its arguments were of the declared type.
so they could be supported after all. Very likely
SIGCONTEXT-FLOATING-POINT-MODES could now be supported, too.
-60:
- The debugger LIST-LOCATIONS command doesn't work properly.
- (How should it work properly?)
-
61:
Compiling and loading
(DEFUN FAIL (X) (THROW 'FAIL-TAG X))
holding... * is not equivalent to T in many cases, such as
(VECTOR *) /= (VECTOR T).
-95:
- The facility for dumping a running Lisp image to disk gets confused
- when run without the PURIFY option, and creates an unnecessarily large
- core file (apparently representing memory usage up to the previous
- high-water mark). Moreover, when the file is loaded, it confuses the
- GC, so that thereafter memory usage can never be reduced below that
- level.
-
- (As of 0.8.7.3 it's likely that the latter half of this bug is fixed.
- The interaction between gencgc and the variables used by
- save-lisp-and-die is still nonoptimal, though, so no respite from
- big core files yet)
-
98:
In sbcl-0.6.11.41 (and in all earlier SBCL, and in CMU
CL), out-of-line structure slot setters are horribly inefficient
a STYLE-WARNING for references to variables similar to locals might
be a good thing.)
-125:
- (as reported by Gabe Garza on cmucl-help 2001-09-21)
- (defvar *tmp* 3)
- (defun test-pred (x y)
- (eq x y))
- (defun test-case ()
- (let* ((x *tmp*)
- (func (lambda () x)))
- (print (eq func func))
- (print (test-pred func func))
- (delete func (list func))))
- Now calling (TEST-CASE) gives output
- NIL
- NIL
- (#<FUNCTION {500A9EF9}>)
- Evidently Python thinks of the lambda as a code transformation so
- much that it forgets that it's also an object.
-
135:
Ideally, uninterning a symbol would allow it, and its associated
FDEFINITION and PROCLAIM data, to be reclaimed by the GC. However,
classes). This means that at present erroneous attempts to use
WITH-SLOTS and the like on classes with metaclass STRUCTURE-CLASS
won't get the corresponding STYLE-WARNING.
+
+ [much later, in 2006-08] in fact it's no longer erroneous to use
+ WITH-SLOTS on structure-classes. However, including :METACLASS
+ STRUCTURE-CLASS in the class definition gives a whole bunch of
+ function redefinition warnings, so we're still not good to close
+ this bug...
+
c. (fixed in 0.8.4.23)
201: "Incautious type inference from compound types"
211: "keywords processing"
a. :ALLOW-OTHER-KEYS T should allow a function to receive an odd
number of keyword arguments.
- e. Compiling
-
- (flet ((foo (&key y) (list y)))
- (list (foo :y 1 :y 2)))
-
- issues confusing message
-
- ; in: LAMBDA NIL
- ; (FOO :Y 1 :Y 2)
- ;
- ; caught STYLE-WARNING:
- ; The variable #:G15 is defined but never used.
212: "Sequence functions and circular arguments"
COERCE, MERGE and CONCATENATE go into an infinite loop when given
This is probably the same bug as 162
-217: "Bad type operations with FUNCTION types"
- In sbcl.0.7.7:
-
- * (values-type-union (specifier-type '(function (base-char)))
- (specifier-type '(function (integer))))
-
- #<FUN-TYPE (FUNCTION (BASE-CHAR) *)>
-
- It causes insertion of wrong type assertions into generated
- code. E.g.
-
- (defun foo (x s)
- (let ((f (etypecase x
- (character #'write-char)
- (integer #'write-byte))))
- (funcall f x s)
- (etypecase x
- (character (write-char x s))
- (integer (write-byte x s)))))
-
- Then (FOO #\1 *STANDARD-OUTPUT*) signals type error.
-
- (In 0.7.9.1 the result type is (FUNCTION * *), so Python does not
- produce invalid code, but type checking is not accurate.)
-
-233: bugs in constraint propagation
- b.
- (declaim (optimize (speed 2) (safety 3)))
- (defun foo (x y)
- (if (typep (prog1 x (setq x y)) 'double-float)
- (+ x 1d0)
- (+ x 2)))
- (foo 1d0 5) => segmentation violation
-
235: "type system and inline expansion"
a.
(declaim (ftype (function (cons) number) acc))
(foo '(nil) '(t)) => NIL, T.
+ As of 0.9.15.41 this seems to be due to ACC being inlined only once
+ inside FOO, which results in the second call reusing the FUNCTIONAL
+ resulting from the first -- which doesn't check the type.
+
237: "Environment arguments to type functions"
a. Functions SUBTYPEP, TYPEP, UPGRADED-ARRAY-ELEMENT-TYPE, and
UPGRADED-COMPLEX-PART-TYPE now have an optional environment
(UNSIGNED-BYTE 8) will write to the stream one byte at a time,
rather than writing the sequence in one go, leading to severe
performance degradation.
+ As of sbcl-0.9.0.36, this is solved for fd-streams, so is less of a
+ problem in practice. (Fully fixing this would require adding a
+ ansi-stream-n-bout slot and associated methods to write a byte
+ sequence to ansi-stream, similar to the existing ansi-stream-sout
+ slot/functions.)
243: "STYLE-WARNING overenthusiasm for unused variables"
(observed from clx compilation)
(fixed in 0.8.2.51, but a test case would be good)
-278:
- a.
- (defun foo ()
- (declare (optimize speed))
- (loop for i of-type (integer 0) from 0 by 2 below 10
- collect i))
-
- uses generic arithmetic.
-
- b. (fixed in 0.8.3.6)
+276:
+ b. The same as in a., but using MULTIPLE-VALUE-SETQ instead of SETQ.
+ c. (defvar *faa*)
+ (defmethod faa ((*faa* double-float))
+ (set '*faa* (when (< *faa* 0) (- *faa*)))
+ (1+ *faa*))
+ (faa 1d0) => type error
279: type propagation error -- correctly inferred type goes astray?
In sbcl-0.8.3 and sbcl-0.8.1.47, the warning
(see also bug 117)
-281: COMPUTE-EFFECTIVE-METHOD error signalling.
- (slightly obscured by a non-0 default value for
- SB-PCL::*MAX-EMF-PRECOMPUTE-METHODS*)
- It would be natural for COMPUTE-EFFECTIVE-METHOD to signal errors
- when it finds a method with invalid qualifiers. However, it
- shouldn't signal errors when any such methods are not applicable to
- the particular call being evaluated, and certainly it shouldn't when
- simply precomputing effective methods that may never be called.
- (setf sb-pcl::*max-emf-precompute-methods* 0)
- (defgeneric foo (x)
- (:method-combination +)
- (:method ((x symbol)) 1)
- (:method + ((x number)) x))
- (foo 1) -> ERROR, but should simply return 1
-
- The issue seems to be that construction of a discriminating function
- calls COMPUTE-EFFECTIVE-METHOD with methods that are not all applicable.
-
283: Thread safety: libc functions
There are places that we call unsafe-for-threading libc functions
that we should find alternatives for, or put locks around. Known or
- strongly suspected problems, as of 0.8.3.10: please update this
+ strongly suspected problems, as of 1.0.3.13: please update this
bug instead of creating new ones
- localtime() - called for timezone calculations in code/time.lisp
-
284: Thread safety: special variables
There are lots of special variables in SBCL, and I feel sure that at
least some of them are indicative of potentially thread-unsafe
(tail)-recursive simplification pass and transforms/VOPs for base
cases.
-287: PPC/Linux miscompilation or corruption in first GC
- When the runtime is compiled with -O3 on certain PPC/Linux machines, a
- segmentation fault is reported at the point of first triggered GC,
- during the compilation of DEFSTRUCT WRAPPER. As a temporary workaround,
- the runtime is no longer compiled with -O3 on PPC/Linux, but it is likely
- that this merely obscures, not solves, the underlying problem; as and when
- underlying problems are fixed, it would be worth trying again to provoke
- this problem.
-
288: fundamental cross-compilation issues (from old UGLINESS file)
Using host floating point numbers to represent target floating point
numbers, or host characters to represent target characters, is
the control word; however, this clobbers any change the user might
have made.
-296:
- (reported by Adam Warner, sbcl-devel 2003-09-23)
-
- The --load toplevel argument does not perform any sanitization of its
- argument. As a result, files with Lisp pathname pattern characters
- (#\* or #\?, for instance) or quotation marks can cause the system
- to perform arbitrary behaviour.
-
297:
LOOP with non-constant arithmetic step clauses suffers from overzealous
type constraint: code of the form
The problem is that both EVALs sequentially write to the same LVAR.
-305:
- (Reported by Dave Roberts.)
- Local INLINE/NOTINLINE declaration removes local FTYPE declaration:
-
- (defun quux (x)
- (declare (ftype (function () (integer 0 10)) fee)
- (inline fee))
- (1+ (fee)))
-
- uses generic arithmetic with INLINE and fixnum without.
-
306: "Imprecise unions of array types"
- a.(defun foo (x)
- (declare (optimize speed)
- (type (or (array cons) (array vector)) x))
- (elt (aref x 0) 0))
- (foo #((0))) => TYPE-ERROR
- relatedly,
+ a. fixed in SBCL 0.9.15.48
b.(subtypep
'array
around the same time regarding a call to LIST on sparc with 1000
arguments) and other implementation limit constants.
-311: "Tokeniser not thread-safe"
- (see also Robert Marlow sbcl-help "Multi threaded read chucking a
- spak" 2004-04-19)
- The tokenizer's use of *read-buffer* and *read-buffer-length* causes
- spurious errors should two threads attempt to tokenise at the same
- time.
-
314: "LOOP :INITIALLY clauses and scope of initializers"
reported by Bruno Haible sbcl-devel "various SBCL bugs" from CLISP
test suite, originally by Thomas F. Burdick.
Expected: (2 6 15 38)
Got: ERROR
-317: "FORMAT of floating point numbers"
- reported by Bruno Haible sbcl-devel "various SBCL bugs" from CLISP
- test suite.
- (format nil "~1F" 10) => "0." ; "10." expected
- (format nil "~0F" 10) => "0." ; "10." expected
- (format nil "~2F" 1234567.1) => "1000000." ; "1234567." expected
- it would be nice if whatever fixed this also untangled the two
- competing implementations of floating point printing (Steele and
- White, and Burger and Dybvig) present in src/code/print.lisp
-
318: "stack overflow in compiler warning with redefined class"
reported by Bruno Haible sbcl-devel "various SBCL bugs" from CLISP
test suite.
#(1 2 ((SB-IMPL::|,|) + 2 2) 4)
which probably isn't intentional.
-323: "REPLACE, BIT-BASH and large strings"
- The transform for REPLACE on simple-base-strings uses BIT-BASH, which
- at present has an upper limit in size. Consequently, in sbcl-0.8.10
- (defun foo ()
- (declare (optimize speed (safety 1)))
- (let ((x (make-string 140000000))
- (y (make-string 140000000)))
- (length (replace x y))))
- (foo)
- gives
- debugger invoked on a TYPE-ERROR in thread 2412:
- The value 1120000000 is not of type (MOD 536870911).
- (see also "more and better sequence transforms" sbcl-devel 2004-05-10)
-
324: "STREAMs and :ELEMENT-TYPE with large bytesize"
In theory, (open foo :element-type '(unsigned-byte <x>)) should work
for all positive integral <x>. At present, it only works for <x> up
Fixing this should also fix a subset of #328 -- update the
description with a new test-case then.
-337: MAKE-METHOD and user-defined method classes
- (reported by Bruno Haible sbcl-devel 2004-06-11)
-
- In the presence of
-
-(defclass user-method (standard-method) (myslot))
-(defmacro def-user-method (name &rest rest)
- (let* ((lambdalist-position (position-if #'listp rest))
- (qualifiers (subseq rest 0 lambdalist-position))
- (lambdalist (elt rest lambdalist-position))
- (body (subseq rest (+ lambdalist-position 1)))
- (required-part
- (subseq lambdalist 0 (or
- (position-if
- (lambda (x) (member x lambda-list-keywords))
- lambdalist)
- (length lambdalist))))
- (specializers (mapcar #'find-class
- (mapcar (lambda (x) (if (consp x) (second x) t))
- required-part)))
- (unspecialized-required-part
- (mapcar (lambda (x) (if (consp x) (first x) x)) required-part))
- (unspecialized-lambdalist
- (append unspecialized-required-part
- (subseq lambdalist (length required-part)))))
- `(PROGN
- (ADD-METHOD #',name
- (MAKE-INSTANCE 'USER-METHOD
- :QUALIFIERS ',qualifiers
- :LAMBDA-LIST ',unspecialized-lambdalist
- :SPECIALIZERS ',specializers
- :FUNCTION
- (LAMBDA (ARGUMENTS NEXT-METHODS-LIST)
- (FLET ((NEXT-METHOD-P () NEXT-METHODS-LIST)
- (CALL-NEXT-METHOD (&REST NEW-ARGUMENTS)
- (UNLESS NEW-ARGUMENTS (SETQ NEW-ARGUMENTS ARGUMENTS))
- (IF (NULL NEXT-METHODS-LIST)
- (ERROR "no next method for arguments ~:S" ARGUMENTS)
- (FUNCALL (SB-PCL:METHOD-FUNCTION
- (FIRST NEXT-METHODS-LIST))
- NEW-ARGUMENTS (REST NEXT-METHODS-LIST)))))
- (APPLY #'(LAMBDA ,unspecialized-lambdalist ,@body) ARGUMENTS)))))
- ',name)))
-
- (progn
- (defgeneric test-um03 (x))
- (defmethod test-um03 ((x integer))
- (list* 'integer x (not (null (next-method-p))) (call-next-method)))
- (def-user-method test-um03 ((x rational))
- (list* 'rational x (not (null (next-method-p))) (call-next-method)))
- (defmethod test-um03 ((x real))
- (list 'real x (not (null (next-method-p)))))
- (test-um03 17))
- works, but
-
- a.(progn
- (defgeneric test-um10 (x))
- (defmethod test-um10 ((x integer))
- (list* 'integer x (not (null (next-method-p))) (call-next-method)))
- (defmethod test-um10 ((x rational))
- (list* 'rational x (not (null (next-method-p))) (call-next-method)))
- (defmethod test-um10 ((x real))
- (list 'real x (not (null (next-method-p)))))
- (defmethod test-um10 :after ((x real)))
- (def-user-method test-um10 :around ((x integer))
- (list* 'around-integer x
- (not (null (next-method-p))) (call-next-method)))
- (defmethod test-um10 :around ((x rational))
- (list* 'around-rational x
- (not (null (next-method-p))) (call-next-method)))
- (defmethod test-um10 :around ((x real))
- (list* 'around-real x (not (null (next-method-p))) (call-next-method)))
- (test-um10 17))
- fails with a type error, and
-
- b.(progn
- (defgeneric test-um12 (x))
- (defmethod test-um12 ((x integer))
- (list* 'integer x (not (null (next-method-p))) (call-next-method)))
- (defmethod test-um12 ((x rational))
- (list* 'rational x (not (null (next-method-p))) (call-next-method)))
- (defmethod test-um12 ((x real))
- (list 'real x (not (null (next-method-p)))))
- (defmethod test-um12 :after ((x real)))
- (defmethod test-um12 :around ((x integer))
- (list* 'around-integer x
- (not (null (next-method-p))) (call-next-method)))
- (defmethod test-um12 :around ((x rational))
- (list* 'around-rational x
- (not (null (next-method-p))) (call-next-method)))
- (def-user-method test-um12 :around ((x real))
- (list* 'around-real x (not (null (next-method-p))) (call-next-method)))
- (test-um12 17))
- fails with NO-APPLICABLE-METHOD.
-
339: "DEFINE-METHOD-COMBINATION bugs"
(reported by Bruno Haible via the clisp test suite)
iii. supplied-p variables for &optional and &key arguments are not
bound.
- c. qualifier matching incorrect
- (progn
- (define-method-combination mc27 ()
- ((normal ())
- (ignored (:ignore :unused)))
- `(list 'result
- ,@(mapcar #'(lambda (method) `(call-method ,method)) normal)))
- (defgeneric test-mc27 (x)
- (:method-combination mc27)
- (:method :ignore ((x number)) (/ 0)))
- (test-mc27 7))
-
- should signal an invalid-method-error, as the :IGNORE (NUMBER)
- method is applicable, and yet matches neither of the method group
- qualifier patterns.
-
-341: PPRINT-LOGICAL-BLOCK / PPRINT-FILL / PPRINT-LINEAR sharing detection.
- (from Paul Dietz' test suite)
-
- CLHS on PPRINT-LINEAR and PPRINT-FILL (and PPRINT-TABULAR, though
- that's slightly different) states that these functions perform
- circular and shared structure detection on their object. Therefore,
-
- a.(let ((*print-circle* t))
- (pprint-linear *standard-output* (let ((x '(a))) (list x x))))
- should print "(#1=(A) #1#)"
-
- b.(let ((*print-circle* t))
- (pprint-linear *standard-output*
- (let ((x (cons nil nil))) (setf (cdr x) x) x)))
- should print "#1=(NIL . #1#)"
-
- (it is likely that the fault lies in PPRINT-LOGICAL-BLOCK, as
- suggested by the suggested implementation of PPRINT-TABULAR)
-
-343: MOP:COMPUTE-DISCRIMINATING-FUNCTION overriding causes error
- Even the simplest possible overriding of
- COMPUTE-DISCRIMINATING-FUNCTION, suggested in the PCL implementation
- as "canonical", does not work:
- (defclass my-generic-function (standard-generic-function) ()
- (:metaclass funcallable-standard-class))
- (defmethod compute-discriminating-function ((gf my-generic-function))
- (let ((dfun (call-next-method)))
- (lambda (&rest args)
- (apply dfun args))))
- (defgeneric foo (x)
- (:generic-function-class my-generic-function))
- (defmethod foo (x) (+ x x))
- (foo 5)
- signals an error. This error is the same even if the LAMBDA is
- replaced by (FUNCTION (SB-KERNEL:INSTANCE-LAMBDA ...)). Maybe the
- SET-FUNCALLABLE-INSTANCE-FUN scary stuff in
- src/code/target-defstruct.lisp is broken? This seems to be broken
- in CMUCL 18e, so it's not caused by a recent change.
+ c. (fixed in sbcl-0.9.15.15)
344: more (?) ROOM T problems (possibly part of bug 108)
In sbcl-0.8.12.51, and off and on leading up to it, the
The class named B is a forward referenced class.
The class named B is a direct superclass of the class named C.
+ [ Is this actually a bug? DEFCLASS only replaces an existing class
+ when the class name is the proper name of that class, and in the
+ above code the class found by (FIND-CLASS 'A) does not have a
+ proper name. CSR, 2006-08-07 ]
+
353: debugger suboptimalities on x86
On x86 backtraces for undefined functions start with a bogus stack
frame, and backtraces for throws to unknown catch tags with a "no
(used on non-x86 platforms) being a more complete solution then what
is done on x86.
+ On x86/linux large portions of tests/debug.impure.lisp have been commented
+ out as failures. The probable culprit for these problems is in x86-call-context
+ (things work fine on x86/freebsd).
+
More generally, the debugger internals suffer from excessive x86/non-x86
conditionalization and OAOOMization: refactoring the common parts would
be good.
Has the XEP for TEST in the backtrace, not the TEST frame itself.
(sparc and x86 at least)
-355: change-class of generic-function
- (reported by Bruno Haible)
- The MOP doesn't support change-class on a generic-function. However, SBCL
- apparently supports it, since it doesn't give an error or warning when doing
- so so. Then, however, it produces wrong results for calls to this generic
- function.
- ;;; The effective-methods cache:
- (progn
- (defgeneric testgf35 (x))
- (defmethod testgf35 ((x integer))
- (cons 'integer (if (next-method-p) (call-next-method))))
- (defmethod testgf35 ((x real))
- (cons 'real (if (next-method-p) (call-next-method))))
- (defclass customized5-generic-function (standard-generic-function)
- ()
- (:metaclass sb-pcl:funcallable-standard-class))
- (defmethod sb-pcl:compute-effective-method ((gf customized5-generic-function) method-combination methods)
- `(REVERSE ,(call-next-method)))
- (list
- (testgf35 3)
- (progn
- (change-class #'testgf35 'customized5-generic-function)
- (testgf35 3))))
- Expected: ((INTEGER REAL) (REAL INTEGER))
- Got: ((INTEGER REAL) (INTEGER REAL))
- ;;; The discriminating-function cache:
- (progn
- (defgeneric testgf36 (x))
- (defmethod testgf36 ((x integer))
- (cons 'integer (if (next-method-p) (call-next-method))))
- (defmethod testgf36 ((x real))
- (cons 'real (if (next-method-p) (call-next-method))))
- (defclass customized6-generic-function (standard-generic-function)
- ()
- (:metaclass sb-pcl:funcallable-standard-class))
- (defmethod sb-pcl:compute-discriminating-function ((gf customized6-generic-function))
- (let ((orig-df (call-next-method)))
- #'(lambda (&rest arguments)
- (reverse (apply orig-df arguments)))))
- (list
- (testgf36 3)
- (progn
- (change-class #'testgf36 'customized6-generic-function)
- (testgf36 3))))
- Expected: ((INTEGER REAL) (REAL INTEGER))
- Got: ((INTEGER REAL) (INTEGER REAL))
+ Since SBCL 0.8.20.1 this is hidden unless *SHOW-ENTRY-POINT-DETAILS*
+ is true (instead there appear two TEST frames at least on ppc). The
+ underlying cause seems to be that SB-C::TAIL-ANNOTATE will not merge
+ the tail-call for the XEP, since Python has by that time proved that
+ the function can never return; same happens if the function holds an
+ unconditional call to ERROR.
356: PCL corruption
(reported by Bruno Haible)
Expected: #<STANDARD-CLASS TYPECHECKING-READER-CLASS>
Got: ERROR "The assertion SB-PCL::WRAPPERS failed."
+ [ This test case does not cause the error any more. However,
+ similar problems can be observed with
+
+ (defclass foo (standard-class) ()
+ (:metaclass sb-mop:funcallable-standard-class))
+ (sb-mop:finalize-inheritance (find-class 'foo))
+ ;; ERROR, ABORT
+ (defclass bar (standard-class) ())
+ (make-instance 'bar)
+ ]
+
357: defstruct inheritance of initforms
(reported by Bruno Haible)
When defstruct and defclass (with :metaclass structure-class) are mixed,
Expected: (t 3 -44 t 9 -88 t 20)
Got: (0 0 0 0 0 0 0 0)
-358: :DECLARE argument to ENSURE-GENERIC-FUNCTION
- (reported by Bruno Haible)
- According to ANSI CL, ensure-generic-function must accept a :DECLARE
- keyword argument. In SBCL 0.8.16 it does not.
- Test case:
- (progn
- (ensure-generic-function 'foo113 :declare '((optimize (speed 3))))
- (sb-pcl:generic-function-declarations #'foo113))
- Expected: ((OPTIMIZE (SPEED 3)))
- Got: ERROR
- Invalid initialization argument:
- :DECLARE
- in call for class #<SB-MOP:FUNCALLABLE-STANDARD-CLASS STANDARD-GENERIC-FUNCTION>.
- See also:
- The ANSI Standard, Section 7.1.2
-
- Bruno notes: The MOP specifies that ensure-generic-function accepts :DECLARATIONS.
- The easiest way to be compliant to both specs is to accept both (exclusively
- or cumulatively).
-
359: wrong default value for ensure-generic-function's :generic-function-class argument
(reported by Bruno Haible)
ANSI CL is silent on this, but the MOP's specification of ENSURE-GENERIC-FUNCTION says:
Expected: #<SB-MOP:FUNCALLABLE-STANDARD-CLASS STANDARD-GENERIC-FUNCTION>
Got: #<SB-MOP:FUNCALLABLE-STANDARD-CLASS MY-GENERIC-FUNCTION>
-360: CALL-METHOD not recognized in method-combination body
- (reported by Bruno Haible)
- This method combination, which adds 'redo' and 'return' restarts for each
- method invocation to standard method combination, gives an error in SBCL.
- (defun prompt-for-new-values ()
- (format *debug-io* "~&New values: ")
- (list (read *debug-io*)))
- (defun add-method-restarts (form method)
- (let ((block (gensym))
- (tag (gensym)))
- `(BLOCK ,block
- (TAGBODY
- ,tag
- (RETURN-FROM ,block
- (RESTART-CASE ,form
- (METHOD-REDO ()
- :REPORT (LAMBDA (STREAM) (FORMAT STREAM "Try calling ~S again." ,method))
- (GO ,tag))
- (METHOD-RETURN (L)
- :REPORT (LAMBDA (STREAM) (FORMAT STREAM "Specify return values for ~S call." ,method))
- :INTERACTIVE (LAMBDA () (PROMPT-FOR-NEW-VALUES))
- (RETURN-FROM ,block (VALUES-LIST L)))))))))
- (defun convert-effective-method (efm)
- (if (consp efm)
- (if (eq (car efm) 'CALL-METHOD)
- (let ((method-list (third efm)))
- (if (or (typep (first method-list) 'method) (rest method-list))
- ; Reduce the case of multiple methods to a single one.
- ; Make the call to the next-method explicit.
- (convert-effective-method
- `(CALL-METHOD ,(second efm)
- ((MAKE-METHOD
- (CALL-METHOD ,(first method-list) ,(rest method-list))))))
- ; Now the case of at most one method.
- (if (typep (second efm) 'method)
- ; Wrap the method call in a RESTART-CASE.
- (add-method-restarts
- (cons (convert-effective-method (car efm))
- (convert-effective-method (cdr efm)))
- (second efm))
- ; Normal recursive processing.
- (cons (convert-effective-method (car efm))
- (convert-effective-method (cdr efm))))))
- (cons (convert-effective-method (car efm))
- (convert-effective-method (cdr efm))))
- efm))
- (define-method-combination standard-with-restarts ()
- ((around (:around))
- (before (:before))
- (primary () :required t)
- (after (:after)))
- (flet ((call-methods-sequentially (methods)
- (mapcar #'(lambda (method)
- `(CALL-METHOD ,method))
- methods)))
- (let ((form (if (or before after (rest primary))
- `(MULTIPLE-VALUE-PROG1
- (PROGN
- ,@(call-methods-sequentially before)
- (CALL-METHOD ,(first primary) ,(rest primary)))
- ,@(call-methods-sequentially (reverse after)))
- `(CALL-METHOD ,(first primary)))))
- (when around
- (setq form
- `(CALL-METHOD ,(first around)
- (,@(rest around) (MAKE-METHOD ,form)))))
- (convert-effective-method form))))
- (defgeneric testgf16 (x) (:method-combination standard-with-restarts))
- (defclass testclass16a () ())
- (defclass testclass16b (testclass16a) ())
- (defclass testclass16c (testclass16a) ())
- (defclass testclass16d (testclass16b testclass16c) ())
- (defmethod testgf16 ((x testclass16a))
- (list 'a
- (not (null (find-restart 'method-redo)))
- (not (null (find-restart 'method-return)))))
- (defmethod testgf16 ((x testclass16b))
- (cons 'b (call-next-method)))
- (defmethod testgf16 ((x testclass16c))
- (cons 'c (call-next-method)))
- (defmethod testgf16 ((x testclass16d))
- (cons 'd (call-next-method)))
- (testgf16 (make-instance 'testclass16d))
-
- Expected: (D B C A T T)
- Got: ERROR CALL-METHOD outside of a effective method form
-
- This is a bug because ANSI CL HyperSpec/Body/locmac_call-m__make-method
- says
- "The macro call-method invokes the specified method, supplying it with
- arguments and with definitions for call-next-method and for next-method-p.
- If the invocation of call-method is lexically inside of a make-method,
- the arguments are those that were supplied to that method. Otherwise
- the arguments are those that were supplied to the generic function."
- and the example uses nothing more than these two cases (as you can see by
- doing (trace convert-effective-method)).
-
-361: initialize-instance of standard-reader-method ignores :function argument
- (reported by Bruno Haible)
- Pass a custom :function argument to initialize-instance of a
- standard-reader-method instance, but it has no effect.
- ;; Check that it's possible to define reader methods that do typechecking.
- (progn
- (defclass typechecking-reader-method (sb-pcl:standard-reader-method)
- ())
- (defmethod initialize-instance ((method typechecking-reader-method) &rest initargs
- &key slot-definition)
- (let ((name (sb-pcl:slot-definition-name slot-definition))
- (type (sb-pcl:slot-definition-type slot-definition)))
- (apply #'call-next-method method
- :function #'(lambda (args next-methods)
- (declare (ignore next-methods))
- (apply #'(lambda (instance)
- (let ((value (slot-value instance name)))
- (unless (typep value type)
- (error "Slot ~S of ~S is not of type ~S: ~S"
- name instance type value))
- value))
- args))
- initargs)))
- (defclass typechecking-reader-class (standard-class)
- ())
- (defmethod sb-pcl:validate-superclass ((c1 typechecking-reader-class) (c2 standard-class))
- t)
- (defmethod reader-method-class ((class typechecking-reader-class) direct-slot &rest args)
- (find-class 'typechecking-reader-method))
- (defclass testclass25 ()
- ((pair :type (cons symbol (cons symbol null)) :initarg :pair :accessor testclass25-pair))
- (:metaclass typechecking-reader-class))
- (macrolet ((succeeds (form)
- `(not (nth-value 1 (ignore-errors ,form)))))
- (let ((p (list 'abc 'def))
- (x (make-instance 'testclass25)))
- (list (succeeds (make-instance 'testclass25 :pair '(seventeen 17)))
- (succeeds (setf (testclass25-pair x) p))
- (succeeds (setf (second p) 456))
- (succeeds (testclass25-pair x))
- (succeeds (slot-value x 'pair))))))
- Expected: (t t t nil t)
- Got: (t t t t t)
-
- (inspect (first (sb-pcl:generic-function-methods #'testclass25-pair)))
- shows that the method was created with a FAST-FUNCTION slot but with a
- FUNCTION slot of NIL.
-
362: missing error when a slot-definition is created without a name
(reported by Bruno Haible)
The MOP says about slot-definition initialization:
Expected: ERROR
Got: #<SB-MOP:STANDARD-DIRECT-SLOT-DEFINITION FOO>
-364: does not support class objects as specializer names
- (reported by Bruno Haible)
- According to ANSI CL 7.6.2, class objects are valid specializer names,
- and "Parameter specializer names are used in macros intended as the
- user-level interface (defmethod)". DEFMETHOD's syntax section doesn't
- mention this possibility in the BNF for parameter-specializer-name;
- however, this appears to be an editorial omission, since the CLHS
- mentions issue CLASS-OBJECT-SPECIALIZER:AFFIRM as being approved
- by X3J13. SBCL doesn't support it:
- (defclass foo () ())
- (defmethod goo ((x #.(find-class 'foo))) x)
- Expected: #<STANDARD-METHOD GOO (#<STANDARD-CLASS FOO>)>
- Got: ERROR "#<STANDARD-CLASS FOO> is not a legal class name."
-
-365: mixin on generic-function subclass
- (reported by Bruno Haible)
- a mixin class
- (defclass prioritized-dispatcher ()
- ((dependents :type list :initform nil)))
- on a generic-function subclass:
- (defclass prioritized-generic-function (prioritized-dispatcher standard-generic-function)
- ()
- (:metaclass sb-pcl:funcallable-standard-class))
- SBCL gives an error on this, telling to define a method on SB-MOP:VALIDATE-SUPERCLASS. If done,
- (defmethod sb-pcl:validate-superclass ((c1 sb-pcl:funcallable-standard-class)
- (c2 (eql (find-class 'prioritized-dispatcher))))
- t)
- then, however,
- (defclass prioritized-generic-function (prioritized-dispatcher standard-generic-function)
- ()
- (:metaclass sb-pcl:funcallable-standard-class))
- => debugger invoked on a SIMPLE-ERROR in thread 6687:
- layout depth conflict: #(#<SB-KERNEL:LAYOUT for T {500E1E9}> ...)
-
- Further discussion on this: http://thread.gmane.org/gmane.lisp.steel-bank.general/491
-
-366: cannot define two generic functions with user-defined class
- (reported by Bruno Haible)
- it is possible to define one generic function class and an instance
- of it. But attempting to do the same thing again, in the same session,
- leads to a "Control stack exhausted" error. Test case:
- (defclass my-generic-function-1 (standard-generic-function)
- ()
- (:metaclass sb-pcl:funcallable-standard-class))
- (defgeneric testgf-1 (x) (:generic-function-class my-generic-function-1)
- (:method ((x integer)) (cons 'integer nil)))
- (defclass my-generic-function-2 (standard-generic-function)
- ()
- (:metaclass sb-pcl:funcallable-standard-class))
- (defgeneric testgf-2 (x) (:generic-function-class my-generic-function-2)
- (:method ((x integer)) (cons 'integer nil)))
- => SB-KERNEL::CONTROL-STACK-EXHAUSTED
-
+369: unlike-an-intersection behavior of VALUES-TYPE-INTERSECTION
+ In sbcl-0.8.18.2, the identity $(x \cap y \cap y)=(x \cap y)$
+ does not hold for VALUES-TYPE-INTERSECTION, even for types which
+ can be intersected exactly, so that ASSERTs fail in this test case:
+ (in-package :cl-user)
+ (let ((types (mapcar #'sb-c::values-specifier-type
+ '((values (vector package) &optional)
+ (values (vector package) &rest t)
+ (values (vector hash-table) &rest t)
+ (values (vector hash-table) &optional)
+ (values t &optional)
+ (values t &rest t)
+ (values nil &optional)
+ (values nil &rest t)
+ (values sequence &optional)
+ (values sequence &rest t)
+ (values list &optional)
+ (values list &rest t)))))
+ (dolist (x types)
+ (dolist (y types)
+ (let ((i (sb-c::values-type-intersection x y)))
+ (assert (sb-c::type= i (sb-c::values-type-intersection i x)))
+ (assert (sb-c::type= i (sb-c::values-type-intersection i y)))))))
+
+370: reader misbehaviour on large-exponent floats
+ (read-from-string "1.0s1000000000000000000000000000000000000000")
+ causes the reader to attempt to create a very large bignum (which it
+ will then attempt to coerce to a rational). While this isn't
+ completely wrong, it is probably not ideal -- checking the floating
+ point control word state and then returning the relevant float
+ (most-positive-short-float or short-float-infinity) or signalling an
+ error immediately would seem to make more sense.
+
+372: floating-point overflow not signalled on ppc/darwin
+ The following assertions in float.pure.lisp fail on ppc/darwin
+ (Mac OS X version 10.3.7):
+ (assert (raises-error? (scale-float 1.0 most-positive-fixnum)
+ floating-point-overflow))
+ (assert (raises-error? (scale-float 1.0d0 (1+ most-positive-fixnum))
+ floating-point-overflow)))
+ as the SCALE-FLOAT just returns
+ #.SB-EXT:SINGLE/DOUBLE-FLOAT-POSITIVE-INFINITY. These tests have been
+ disabled on Darwin for now.
+
+377: Memory fault error reporting
+ On those architectures where :C-STACK-IS-CONTROL-STACK is in
+ *FEATURES*, we handle SIG_MEMORY_FAULT (SEGV or BUS) on an altstack,
+ so we cannot handle the signal directly (as in interrupt_handle_now())
+ in the case when the signal comes from some external agent (the user
+ using kill(1), or a fault in some foreign code, for instance). As
+ of sbcl-0.8.20.20, this is fixed by calling
+ arrange_return_to_lisp_function() to a new error-signalling
+ function, but as a result the error reporting is poor: we cannot
+ even tell the user at which address the fault occurred. We should
+ arrange such that arguments can be passed to the function called from
+ arrange_return_to_lisp_function(), but this looked hard to do in
+ general without suffering from memory leaks.
+
+379: TRACE :ENCAPSULATE NIL broken on ppc/darwin
+ See commented-out test-case in debug.impure.lisp.
+
+380: Accessor redefinition fails because of old accessor name
+ When redefining an accessor, SB-PCL::FIX-SLOT-ACCESSORS may try to
+ find the generic function named by the old accessor name using
+ ENSURE-GENERIC-FUNCTION and then remove the old accessor's method in
+ the GF. If the old name does not name a function, or if the old name
+ does not name a generic function, no attempt to find the GF or remove
+ any methods is made.
+
+ However, if an unrelated GF with an incompatible lambda list exists,
+ the class redefinition will fail when SB-PCL::REMOVE-READER-METHOD
+ tries to find and remove a method with an incompatible lambda list
+ from the unrelated generic function.
+
+381: incautious calls to EQUAL in fasl dumping
+ Compiling
+ (frob #(#1=(a #1#)))
+ (frob #(#1=(b #1#)))
+ (frob #(#1=(a #1#)))
+ in sbcl-0.9.0 causes CONTROL-STACK-EXHAUSTED. My (WHN) impression
+ is that this follows from the use of (MAKE-HASH-TABLE :TEST 'EQUAL)
+ to detect sharing, in which case fixing it might require either
+ getting less ambitious about detecting shared list structure, or
+ implementing the moral equivalent of EQUAL hash tables in a
+ cycle-tolerant way.
+
+382: externalization unexpectedly changes array simplicity
+ COMPILE-FILE and LOAD
+ (defun foo ()
+ (let ((x #.(make-array 4 :fill-pointer 0)))
+ (values (eval `(typep ',x 'simple-array))
+ (typep x 'simple-array))))
+ then (FOO) => T, NIL.
+
+ Similar problems exist with SIMPLE-ARRAY-P, ARRAY-HEADER accessors
+ and all array dimension functions.
+
+383: ASH'ing non-constant zeros
+ Compiling
+ (lambda (b)
+ (declare (type (integer -2 14) b))
+ (declare (ignorable b))
+ (ash (imagpart b) 57))
+ on PPC (and other platforms, presumably) gives an error during the
+ emission of FASH-ASH-LEFT/FIXNUM=>FIXNUM as the assembler attempts to
+ stuff a too-large constant into the immediate field of a PPC
+ instruction. Either the VOP should be fixed or the compiler should be
+ taught how to transform this case away, paying particular attention
+ to side-effects that might occur in the arguments to ASH.
+
+384: Compiler runaway on very large character types
+
+ (compile nil '(lambda (x)
+ (declare (type (member #\a 1) x))
+ (the (member 1 nil) x)))
+
+ The types apparently normalize into a very large type, and the compiler
+ gets lost in REMOVE-DUPLICATES. Perhaps the latter should use
+ a better algorithm (one based on hash tables, say) on very long lists
+ when :TEST has its default value?
+
+ A simpler example:
+
+ (compile nil '(lambda (x) (the (not (eql #\a)) x)))
+
+ (partially fixed in 0.9.3.1, but a better representation for these
+ types is needed.)
+
+385:
+ (format nil "~4,1F" 0.001) => "0.00" (should be " 0.0");
+ (format nil "~4,1@F" 0.001) => "+.00" (should be "+0.0").
+
+386: SunOS/x86 stack exhaustion handling broken
+ According to <http://alfa.s145.xrea.com/sbcl/solaris-x86.html>, the
+ stack exhaustion checking (implemented with a write-protected guard
+ page) does not work on SunOS/x86.
+
+388:
+ (found by Dmitry Bogomolov)
+
+ (defclass foo () ((x :type (unsigned-byte 8))))
+ (defclass bar () ((x :type symbol)))
+ (defclass baz (foo bar) ())
+
+ causes error
+
+ SB-PCL::SPECIALIZER-APPLICABLE-USING-TYPE-P cannot handle the second argument
+ (UNSIGNED-BYTE 8).
+
+ [ Can't trigger this any more, as of 2006-08-07 ]
+
+389:
+ (reported several times on sbcl-devel, by Rick Taube, Brian Rowe and
+ others)
+
+ ROUND-NUMERIC-BOUND assumes that float types always have a FORMAT
+ specifying whether they're SINGLE or DOUBLE. This is true for types
+ computed by the type system itself, but the compiler type derivation
+ short-circuits this and constructs non-canonical types. A temporary
+ fix was made to ROUND-NUMERIC-BOUND for the sbcl-0.9.6 release, but
+ the right fix is to remove the abstraction violation in the
+ compiler's type deriver.
+
+393: Wrong error from methodless generic function
+ (DEFGENERIC FOO (X))
+ (FOO 1 2)
+ gives NO-APPLICABLE-METHOD rather than an argument count error.
+
+395: Unicode and streams
+ One of the remaining problems in SBCL's Unicode support is the lack
+ of generality in certain streams.
+ a. FILL-POINTER-STREAMs: SBCL refuses to write (e.g. using FORMAT)
+ to streams made from strings that aren't character strings with
+ fill-pointers:
+ (let ((v (make-array 5 :fill-pointer 0 :element-type 'standard-char)))
+ (format v "foo")
+ v)
+ should return a non-simple base string containing "foo" but
+ instead errors.
+
+ (reported on sbcl-help by "tichy")
+
+396: block-compilation bug
+ (let ((x 1))
+ (dotimes (y 10)
+ (let ((y y))
+ (when (funcall (eval #'(lambda (x) (eql x 2))) y)
+ (defun foo (z)
+ (incf x (incf y z))))))
+ (defun bar (z)
+ (foo z)
+ (values x)))
+ (bar 1) => 11, should be 4.
+
+397: SLEEP accuracy
+ The more interrupts arrive the less accurate SLEEP's timing gets.
+ (time (sb-thread:terminate-thread
+ (prog1 (sb-thread:make-thread (lambda ()
+ (loop
+ (princ #\!)
+ (force-output)
+ (sb-ext:gc))))
+ (sleep 1))))
+
+398: GC-unsafe SB-ALIEN string deporting
+ Translating a Lisp string to an alien string by taking a SAP to it
+ as done by the :DEPORT-GEN methods for C-STRING and UTF8-STRING
+ is not safe, since the Lisp string can move. For example the
+ following code will fail quickly on both cheneygc and pre-0.9.8.19
+ GENCGC:
+
+ (setf (bytes-consed-between-gcs) 4096)
+ (define-alien-routine "strcmp" int (s1 c-string) (s2 c-string))
+
+ (loop
+ (let ((string "hello, world"))
+ (assert (zerop (strcmp string string)))))
+
+ (This will appear to work on post-0.9.8.19 GENCGC, since
+ the GC no longer zeroes memory immediately after releasing
+ it after a minor GC. Either enabling the READ_PROTECT_FREE_PAGES
+ #define in gencgc.c or modifying the example so that a major
+ GC will occasionally be triggered would unmask the bug.)
+
+ On cheneygc the only solution would seem to be allocating some alien
+ memory, copying the data over, and arranging that it's freed once we
+ return. For GENCGC we could instead try to arrange that the string
+ from which the SAP is taken is always pinned.
+
+ For some more details see comments for (define-alien-type-method
+ (c-string :deport-gen) ...) in host-c-call.lisp.
+
+402: "DECLAIM DECLARATION does not inform the PCL code-walker"
+ reported by Vincent Arkesteijn:
+
+ (declaim (declaration foo))
+ (defgeneric bar (x))
+ (defmethod bar (x)
+ (declare (foo x))
+ x)
+
+ ==> WARNING: The declaration FOO is not understood by
+ SB-PCL::SPLIT-DECLARATIONS.
+ Please put FOO on one of the lists SB-PCL::*NON-VAR-DECLARATIONS*,
+ SB-PCL::*VAR-DECLARATIONS-WITH-ARG*, or
+ SB-PCL::*VAR-DECLARATIONS-WITHOUT-ARG*.
+ (Assuming it is a variable declaration without argument).
+
+403: FORMAT/PPRINT-LOGICAL-BLOCK of CONDITIONs ignoring *PRINT-CIRCLE*
+ In sbcl-0.9.13.34,
+ (defparameter *c*
+ (make-condition 'simple-error
+ :format-control "ow... ~S"
+ :format-arguments '(#1=(#1#))))
+ (setf *print-circle* t *print-level* 4)
+ (format nil "~@<~A~:@>" *c*)
+ gives
+ "ow... (((#)))"
+ where I (WHN) believe the correct result is "ow... #1=(#1#)",
+ like the result from (PRINC-TO-STRING *C*). The question of
+ what the correct result is is complicated by the hairy text in
+ the Hyperspec "22.3.5.2 Tilde Less-Than-Sign: Logical Block",
+ Other than the difference in its argument, ~@<...~:> is
+ exactly the same as ~<...~:> except that circularity detection
+ is not applied if ~@<...~:> is encountered at top level in a
+ format string.
+ But because the odd behavior happens even without the at-sign,
+ (format nil "~<~A~:@>" (list *c*)) ; => "ow... (((#)))"
+ and because something seemingly similar can happen even in
+ PPRINT-LOGICAL-BLOCK invoked directly without FORMAT,
+ (pprint-logical-block (*standard-output* '(some nonempty list))
+ (format *standard-output* "~A" '#1=(#1#)))
+ (which prints "(((#)))" to *STANDARD-OUTPUT*), I don't think
+ that the 22.3.5.2 trickiness is fundamental to the problem.
+
+ My guess is that the problem is related to the logic around the MODE
+ argument to CHECK-FOR-CIRCULARITY, but I haven't reverse-engineered
+ enough of the intended meaning of the different MODE values to be
+ confident of this.
+
+404: nonstandard DWIMness in LOOP with unportably-ordered clauses
+ In sbcl-0.9.13, the code
+ (loop with stack = (make-array 2 :fill-pointer 2 :initial-element t)
+ for length = (length stack)
+ while (plusp length)
+ for element = (vector-pop stack)
+ collect element)
+ compiles without error or warning and returns (T T). Unfortunately,
+ it is inconsistent with the ANSI definition of the LOOP macro,
+ because it mixes up VARIABLE-CLAUSEs with MAIN-CLAUSEs. Furthermore,
+ SBCL's interpretation of the intended meaning is only one possible,
+ unportable interpretation of the noncompliant code; in CLISP 2.33.2,
+ the code compiles with a warning
+ LOOP: FOR clauses should occur before the loop's main body
+ and then fails at runtime with
+ VECTOR-POP: #() has length zero
+ perhaps because CLISP has shuffled the clauses into an
+ ANSI-compliant order before proceeding.
+
+405: a TYPE-ERROR in MERGE-LETS exercised at DEBUG 3
+ In sbcl-0.9.16.21 on linux/86, compiling
+ (declaim (optimize (debug 3)))
+ (defstruct foo bar)
+ (let ()
+ (flet ((i (x) (frob x (foo-bar foo))))
+ (i :five)))
+ causes a TYPE-ERROR
+ The value NIL is not of type SB-C::PHYSENV.
+ in MERGE-LETS.
+
+406: functional has external references -- failed aver
+ Given the following food in a single file
+ (eval-when (:compile-toplevel :load-toplevel :execute)
+ (defstruct foo3))
+ (defstruct bar
+ (foo #.(make-foo3)))
+ as of 0.9.18.11 the file compiler breaks on it:
+ failed AVER: "(NOT (FUNCTIONAL-HAS-EXTERNAL-REFERENCES-P CLAMBDA))"
+ Defining the missing MAKE-LOAD-FORM method makes the error go away.
+
+407: misoptimization of loop, COERCE 'FLOAT, and HANDLER-CASE for bignums
+ (reported by Ariel Badichi on sbcl-devel 2007-01-09)
+ 407a: In sbcl-1.0.1 on Linux x86,
+ (defun foo ()
+ (loop for n from (expt 2 1024) do
+ (handler-case
+ (coerce n 'single-float)
+ (simple-type-error ()
+ (format t "Got here.~%")
+ (return-from foo)))))
+ (foo)
+ causes an infinite loop, where handling the error would be expected.
+ 407b: In sbcl-1.0.1 on Linux x86,
+ (defun bar ()
+ (loop for n from (expt 2 1024) do
+ (handler-case
+ (format t "~E~%" (coerce n 'single-float))
+ (simple-type-error ()
+ (format t "Got here.~%")
+ (return-from bar)))))
+ fails to compile, with
+ Too large to be represented as a SINGLE-FLOAT: ...
+ from
+ 0: ((LABELS SB-BIGNUM::CHECK-EXPONENT) ...)
+ 1: ((LABELS SB-BIGNUM::FLOAT-FROM-BITS) ...)
+ 2: (SB-KERNEL:%SINGLE-FLOAT ...)
+ 3: (SB-C::BOUND-FUNC ...)
+ 4: (SB-C::%SINGLE-FLOAT-DERIVE-TYPE-AUX ...)
+
+408: SUBTYPEP confusion re. OR of SATISFIES of not-yet-defined predicate
+ As reported by Levente M\'{e}sz\'{a}ros sbcl-devel 2006-02-20,
+ (aver (equal (multiple-value-list
+ (subtypep '(or (satisfies x) string)
+ '(or (satisfies x) integer)))
+ '(nil nil)))
+ fails. Also, beneath that failure lurks another failure,
+ (aver (equal (multiple-value-list
+ (subtypep 'string
+ '(or (satisfies x) integer)))
+ '(nil nil)))
+ Having looked at this for an hour or so in sbcl-1.0.2, and
+ specifically having looked at the output from
+ laptop$ sbcl
+ * (let ((x 'string)
+ (y '(or (satisfies x) integer)))
+ (trace sb-kernel::union-complex-subtypep-arg2
+ sb-kernel::invoke-complex-subtypep-arg1-method
+ sb-kernel::type-union
+ sb-kernel::type-intersection
+ sb-kernel::type=)
+ (subtypep x y))
+ my (WHN) impression is that the problem is that the semantics of TYPE=
+ are wrong for what the UNION-COMPLEX-SUBTYPEP-ARG2 code is trying
+ to use it for. The comments on the definition of TYPE= probably
+ date back to CMU CL and seem to define it as a confusing thing:
+ its primary value is something like "certainly equal," and its
+ secondary value is something like "certain about that certainty."
+ I'm left uncertain how to fix UNION-COMPLEX-SUBTYPEP-ARG2 without
+ reducing its generality by removing the TYPE= cleverness. Possibly
+ the tempting TYPE/= relative defined next to it might be a
+ suitable replacement for the purpose. Probably, though, it would
+ be best to start by reverse engineering exactly what TYPE= and
+ TYPE/= do, and writing an explanation which is so clear that one
+ can see immediately what it's supposed to mean in odd cases like
+ (TYPE= '(SATISFIES X) 'INTEGER) when X isn't defined yet.
+
+409: MORE TYPE SYSTEM PROBLEMS
+ Found while investigating an optimization failure for extended
+ sequences. The extended sequence type implementation was altered to
+ work around the problem, but the fundamental problem remains, to wit:
+ (sb-kernel:type= (sb-kernel:specifier-type '(or float ratio))
+ (sb-kernel:specifier-type 'single-float))
+ returns NIL, NIL on sbcl-1.0.3.
+ (probably related to bug #408)
+
+410: read circularities and type declarations
+ Consider the definition
+ (defstruct foo (a 0 :type (not symbol)))
+ followed by
+ (setf *print-circle* t) ; just in case
+ (read-from-string "#1=#s(foo :a #1#)")
+ This gives a type error (#:G1 is not a (NOT SYMBOL)) because of the
+ implementation of read circularity, using a symbol as a marker for
+ the previously-referenced object.
+
+411: NAN issues on x86-64
+ Test :NAN-COMPARISONS in float.pure.lisp fails on x86-64, and has been
+ disabled on those platforms. Since x86 does not exhibit any problems
+ the problem is probably with the new FP implementation.
projects / sbcl.git / blobdiff