3 Bugs can be reported on the help mailing list
4 sbcl-help@lists.sourceforge.net
5 or on the development mailing list
6 sbcl-devel@lists.sourceforge.net
8 Please include enough information in a bug report that someone reading
9 it can reproduce the problem, i.e. don't write
10 Subject: apparent bug in PRINT-OBJECT (or *PRINT-LENGTH*?)
11 PRINT-OBJECT doesn't seem to work with *PRINT-LENGTH*. Is this a bug?
13 Subject: apparent bug in PRINT-OBJECT (or *PRINT-LENGTH*?)
14 In sbcl-1.2.3 running under OpenBSD 4.5 on my Alpha box, when
15 I compile and load the file
16 (DEFSTRUCT (FOO (:PRINT-OBJECT (LAMBDA (X Y)
17 (LET ((*PRINT-LENGTH* 4))
20 then at the command line type
22 the program loops endlessly instead of printing the object.
27 There is also some information on bugs in the manual page and
28 in the TODO file. Eventually more such information may move here.
30 The gaps in the number sequence belong to old bug descriptions which
31 have gone away (typically because they were fixed, but sometimes for
32 other reasons, e.g. because they were moved elsewhere).
35 KNOWN BUGS OF NO SPECIAL CLASS:
38 DEFSTRUCT almost certainly should overwrite the old LAYOUT information
39 instead of just punting when a contradictory structure definition
40 is loaded. As it is, if you redefine DEFSTRUCTs in a way which
41 changes their layout, you probably have to rebuild your entire
42 program, even if you know or guess enough about the internals of
43 SBCL to wager that this (undefined in ANSI) operation would be safe.
46 ANSI specifies that a type mismatch in a structure slot
47 initialization value should not cause a warning.
49 This one might not be fixed for a while because while we're big
50 believers in ANSI compatibility and all, (1) there's no obvious
51 simple way to do it (short of disabling all warnings for type
52 mismatches everywhere), and (2) there's a good portable
53 workaround, and (3) by their own reasoning, it looks as though
54 ANSI may have gotten it wrong. ANSI justifies this specification
56 The restriction against issuing a warning for type mismatches
57 between a slot-initform and the corresponding slot's :TYPE
58 option is necessary because a slot-initform must be specified
59 in order to specify slot options; in some cases, no suitable
61 However, in SBCL (as in CMU CL or, for that matter, any compiler
62 which really understands Common Lisp types) a suitable default
63 does exist, in all cases, because the compiler understands the
64 concept of functions which never return (i.e. has return type NIL).
65 Thus, as a portable workaround, you can use a call to some
66 known-never-to-return function as the default. E.g.
68 (BAR (ERROR "missing :BAR argument")
69 :TYPE SOME-TYPE-TOO-HAIRY-TO-CONSTRUCT-AN-INSTANCE-OF))
71 (DECLAIM (FTYPE (FUNCTION () NIL) MISSING-ARG))
72 (DEFUN REQUIRED-ARG () ; workaround for SBCL non-ANSI slot init typing
73 (ERROR "missing required argument"))
75 (BAR (REQUIRED-ARG) :TYPE TRICKY-TYPE-OF-SOME-SORT)
76 (BLETCH (REQUIRED-ARG) :TYPE TRICKY-TYPE-OF-SOME-SORT)
77 (N-REFS-SO-FAR 0 :TYPE (INTEGER 0)))
78 Such code should compile without complaint and work correctly either
79 on SBCL or on any other completely compliant Common Lisp system.
82 bogus warnings about undefined functions for magic functions like
83 SB!C::%%DEFUN and SB!C::%DEFCONSTANT when cross-compiling files
84 like src/code/float.lisp. Fixing this will probably require
85 straightening out enough bootstrap consistency issues that
86 the cross-compiler can run with *TYPE-SYSTEM-INITIALIZED*.
87 Instead, the cross-compiler runs in a slightly flaky state
88 which is sane enough to compile SBCL itself, but which is
89 also unstable in several ways, including its inability
90 to really grok function declarations.
92 As of sbcl-0.7.5, sbcl's cross-compiler does run with
93 *TYPE-SYSTEM-INITIALIZED*; however, this bug remains.
96 The "compiling top-level form:" output ought to be condensed.
97 Perhaps any number of such consecutive lines ought to turn into a
98 single "compiling top-level forms:" line.
101 The way that the compiler munges types with arguments together
102 with types with no arguments (in e.g. TYPE-EXPAND) leads to
103 weirdness visible to the user:
104 (DEFTYPE FOO () 'FIXNUM)
106 (TYPEP 11 '(FOO)) => T, which seems weird
107 (TYPEP 11 'FIXNUM) => T
108 (TYPEP 11 '(FIXNUM)) signals an error, as it should
109 The situation is complicated by the presence of Common Lisp types
110 like UNSIGNED-BYTE (which can either be used in list form or alone)
111 so I'm not 100% sure that the behavior above is actually illegal.
112 But I'm 90+% sure, and the following related behavior,
114 treating the bare symbol AND as equivalent to '(AND), is specifically
115 forbidden (by the ANSI specification of the AND type).
118 It would be nice if the
120 (during macroexpansion)
121 said what macroexpansion was at fault, e.g.
123 (during macroexpansion of IN-PACKAGE,
124 during macroexpansion of DEFFOO)
127 (SUBTYPEP '(FUNCTION (T BOOLEAN) NIL)
128 '(FUNCTION (FIXNUM FIXNUM) NIL)) => T, T
129 (Also, when this is fixed, we can enable the code in PROCLAIM which
130 checks for incompatible FTYPE redeclarations.)
133 (I *think* this is a bug. It certainly seems like strange behavior. But
134 the ANSI spec is scary, dark, and deep.. -- WHN)
135 (FORMAT NIL "~,1G" 1.4) => "1. "
136 (FORMAT NIL "~3,1G" 1.4) => "1. "
139 from Marco Antoniotti on cmucl-imp mailing list 1 Mar 2000:
141 (setf (find-class 'ccc1) (find-class 'ccc))
142 (defmethod zut ((c ccc1)) 123)
143 In sbcl-0.7.1.13, this gives an error,
144 There is no class named CCC1.
145 DTC's recommended workaround from the mailing list 3 Mar 2000:
146 (setf (pcl::find-class 'ccc1) (pcl::find-class 'ccc))
149 Sometimes (SB-EXT:QUIT) fails with
150 Argh! maximum interrupt nesting depth (4096) exceeded, exiting
151 Process inferior-lisp exited abnormally with code 1
152 I haven't noticed a repeatable case of this yet.
155 The printer doesn't report closures very well. This is true in
159 #<Closure Over Function "DEFUN STRUCTURE-SLOT-ACCESSOR" {134D1A1}>
160 It would be nice to make closures have a settable name slot,
161 and make things like DEFSTRUCT and FLET, which create closures,
162 set helpful values into this slot.
165 And as long as we're wishing, it would be awfully nice if INSPECT could
166 also report on closures, telling about the values of the bound variables.
169 The compiler assumes that any time a function of declared FTYPE
170 doesn't signal an error, its arguments were of the declared type.
171 E.g. compiling and loading
172 (DECLAIM (OPTIMIZE (SAFETY 3)))
173 (DEFUN FACTORIAL (X) (GAMMA (1+ X)))
175 (DECLAIM (FTYPE (FUNCTION (UNSIGNED-BYTE)) FACTORIAL))
177 (COND ((> (FACTORIAL X) 1.0E6)
178 (FORMAT T "too big~%"))
180 (FORMAT T "exactly ~S~%" (FACTORIAL X)))
182 (FORMAT T "approximately ~S~%" (FACTORIAL X)))))
185 will cause the INTEGERP case to be selected, giving bogus output a la
187 This violates the "declarations are assertions" principle.
188 According to the ANSI spec, in the section "System Class FUNCTION",
189 this is a case of "lying to the compiler", but the lying is done
190 by the code which calls FACTORIAL with non-UNSIGNED-BYTE arguments,
191 not by the unexpectedly general definition of FACTORIAL. In any case,
192 "declarations are assertions" means that lying to the compiler should
193 cause an error to be signalled, and should not cause a bogus
194 result to be returned. Thus, the compiler should not assume
195 that arbitrary functions check their argument types. (It might
196 make sense to add another flag (CHECKED?) to DEFKNOWN to
197 identify functions which *do* check their argument types.)
198 (Also, verify that the compiler handles declared function
199 return types as assertions.)
202 TYPEP of VALUES types is sometimes implemented very inefficiently, e.g. in
203 (DEFTYPE INDEXOID () '(INTEGER 0 1000))
205 (DECLARE (TYPE INDEXOID X))
206 (THE (VALUES INDEXOID)
208 where the implementation of the type check in function FOO
209 includes a full call to %TYPEP. There are also some fundamental problems
210 with the interpretation of VALUES types (inherited from CMU CL, and
211 from the ANSI CL standard) as discussed on the cmucl-imp@cons.org
212 mailing list, e.g. in Robert Maclachlan's post of 21 Jun 2000.
215 The definitions of SIGCONTEXT-FLOAT-REGISTER and
216 %SET-SIGCONTEXT-FLOAT-REGISTER in x86-vm.lisp say they're not
217 supported on FreeBSD because the floating point state is not saved,
218 but at least as of FreeBSD 4.0, the floating point state *is* saved,
219 so they could be supported after all. Very likely
220 SIGCONTEXT-FLOATING-POINT-MODES could now be supported, too.
223 (as discussed by Douglas Crosher on the cmucl-imp mailing list ca.
224 Aug. 10, 2000): CMUCL currently interprets 'member as '(member); same
225 issue with 'union, 'and, 'or etc. So even though according to the
226 ANSI spec, bare 'MEMBER, 'AND, and 'OR are not legal types, CMUCL
227 (and now SBCL) interpret them as legal types.
230 a slew of floating-point-related errors reported by Peter Van Eynde
232 b: SBCL's value for LEAST-POSITIVE-SHORT-FLOAT is bogus, and
233 should probably be 1.4012985e-45. In SBCL,
234 (/ LEAST-POSITIVE-SHORT-FLOAT 2) returns a number smaller
235 than LEAST-POSITIVE-SHORT-FLOAT. Similar problems
236 exist for LEAST-NEGATIVE-SHORT-FLOAT, LEAST-POSITIVE-LONG-FLOAT,
237 and LEAST-NEGATIVE-LONG-FLOAT.
238 c: Many expressions generate floating infinity on x86/Linux:
243 PVE's regression tests want them to raise errors. sbcl-0.7.0.5
244 on x86/Linux generates the infinities instead. That might or
245 might not be conforming behavior, but it's also inconsistent,
246 which is almost certainly wrong. (Inconsistency: (/ 1 0.0)
247 should give the same result as (/ 1.0 0.0), but instead (/ 1 0.0)
248 generates SINGLE-FLOAT-POSITIVE-INFINITY and (/ 1.0 0.0)
250 d: (in section12.erg) various forms a la
251 (FLOAT 1 DOUBLE-FLOAT-EPSILON)
252 don't give the right behavior.
255 type safety errors reported by Peter Van Eynde July 25, 2000:
256 a: (COERCE (QUOTE (A B C)) (QUOTE (VECTOR * 4)))
258 In general lengths of array type specifications aren't
259 checked by COERCE, so it fails when the spec is
260 (VECTOR 4), (STRING 2), (SIMPLE-BIT-VECTOR 3), or whatever.
261 b: CONCATENATE has the same problem of not checking the length
262 of specified output array types. MAKE-SEQUENCE and MAP and
263 MERGE also have the same problem.
264 c: (COERCE 'AND 'FUNCTION) returns something related to
265 (MACRO-FUNCTION 'AND), but ANSI says it should raise an error.
266 h: (MAKE-CONCATENATED-STREAM (MAKE-STRING-OUTPUT-STREAM))
267 should signal TYPE-ERROR.
268 i: MAKE-TWO-WAY-STREAM doesn't check that its arguments can
269 be used for input and output as needed. It should fail with
270 TYPE-ERROR when handed e.g. the results of
271 MAKE-STRING-INPUT-STREAM or MAKE-STRING-OUTPUT-STREAM in
272 the inappropriate positions, but doesn't.
273 k: READ-BYTE is supposed to signal TYPE-ERROR when its argument is
274 not a binary input stream, but instead cheerfully reads from
275 character streams, e.g. (MAKE-STRING-INPUT-STREAM "abc").
278 DEFCLASS bugs reported by Peter Van Eynde July 25, 2000:
279 a: (DEFCLASS FOO () (A B A)) should signal a PROGRAM-ERROR, and
281 b: (DEFCLASS FOO () (A B A) (:DEFAULT-INITARGS X A X B)) should
282 signal a PROGRAM-ERROR, and doesn't.
283 c: (DEFCLASS FOO07 NIL ((A :ALLOCATION :CLASS :ALLOCATION :CLASS))),
284 and other DEFCLASS forms with duplicate specifications in their
285 slots, should signal a PROGRAM-ERROR, and doesn't.
286 d: (DEFGENERIC IF (X)) should signal a PROGRAM-ERROR, but instead
287 causes a COMPILER-ERROR.
290 SYMBOL-MACROLET bugs reported by Peter Van Eynde July 25, 2000:
291 c: SYMBOL-MACROLET should signal PROGRAM-ERROR if something
292 it binds is declared SPECIAL inside.
295 miscellaneous errors reported by Peter Van Eynde July 25, 2000:
297 (DEFGENERIC FOO02 (X))
298 (DEFMETHOD FOO02 ((X NUMBER)) T)
299 (LET ((M (FIND-METHOD (FUNCTION FOO02)
301 (LIST (FIND-CLASS (QUOTE NUMBER))))))
302 (REMOVE-METHOD (FUNCTION FOO02) M)
303 (DEFGENERIC FOO03 (X))
304 (ADD-METHOD (FUNCTION FOO03) M)))
305 should give an error, but SBCL allows it.
306 b: READ should probably return READER-ERROR, not the bare
307 arithmetic error, when input a la "1/0" or "1e1000" causes
311 It has been reported (e.g. by Peter Van Eynde) that there are
312 several metaobject protocol "errors". (In order to fix them, we might
313 need to document exactly what metaobject protocol specification
314 we're following -- the current code is just inherited from PCL.)
317 The implementation of #'+ returns its single argument without
318 type checking, e.g. (+ "illegal") => "illegal".
321 The debugger LIST-LOCATIONS command doesn't work properly.
324 Compiling and loading
325 (DEFUN FAIL (X) (THROW 'FAIL-TAG X))
327 then requesting a BACKTRACE at the debugger prompt gives no information
328 about where in the user program the problem occurred.
331 The compiler is supposed to do type inference well enough that
334 ((SIMPLE-ARRAY SINGLE-FLOAT)
336 (DECLARE (TYPE (SIMPLE-ARRAY SINGLE-FLOAT) X))
339 is redundant. However, as reported by Juan Jose Garcia Ripoll for
340 CMU CL, it sometimes doesn't. Adding declarations is a pretty good
341 workaround for the problem for now, but can't be done by the TYPECASE
342 macros themselves, since it's too hard for the macro to detect
343 assignments to the variable within the clause.
344 Note: The compiler *is* smart enough to do the type inference in
345 many cases. This case, derived from a couple of MACROEXPAND-1
346 calls on Ripoll's original test case,
348 (DECLARE (OPTIMIZE SPEED (SAFETY 0)))
349 (COND ((TYPEP A '(SIMPLE-ARRAY SINGLE-FLOAT)) NIL
350 (LET ((LENGTH (ARRAY-TOTAL-SIZE A)))
351 (LET ((I 0) (G2554 LENGTH))
352 (DECLARE (TYPE REAL G2554) (TYPE REAL I))
355 (WHEN (>= I G2554) (GO SB-LOOP::END-LOOP))
356 (SETF (ROW-MAJOR-AREF A I) (- (ROW-MAJOR-AREF A I)))
357 (GO SB-LOOP::NEXT-LOOP)
358 SB-LOOP::END-LOOP))))))
359 demonstrates the problem; but the problem goes away if the TAGBODY
360 and GO forms are removed (leaving the SETF in ordinary, non-looping
361 code), or if the TAGBODY and GO forms are retained, but the
362 assigned value becomes 0.0 instead of (- (ROW-MAJOR-AREF A I)).
365 Paul Werkowski wrote on cmucl-imp@cons.org 2000-11-15
366 I am looking into this problem that showed up on the cmucl-help
367 list. It seems to me that the "implementation specific environment
368 hacking functions" found in pcl/walker.lisp are completely messed
369 up. The good thing is that they appear to be barely used within
370 PCL and the munged environment object is passed to cmucl only
371 in calls to macroexpand-1, which is probably why this case fails.
372 SBCL uses essentially the same code, so if the environment hacking
373 is screwed up, it affects us too.
376 Using the pretty-printer from the command prompt gives funny
377 results, apparently because the pretty-printer doesn't know
378 about user's command input, including the user's carriage return
379 that the user, and therefore the pretty-printer thinks that
380 the new output block should start indented 2 or more characters
381 rightward of the correct location.
384 ANSI specifies that the RESULT-TYPE argument of CONCATENATE must be
385 a subtype of SEQUENCE, but CONCATENATE doesn't check this properly:
386 (CONCATENATE 'SIMPLE-ARRAY #(1 2) '(3)) => #(1 2 3)
387 This also leads to funny behavior when derived type specifiers
388 are used, as originally reported by Milan Zamazal for CMU CL (on the
389 Debian bugs mailing list (?) 2000-02-27), then reported by Martin
390 Atzmueller for SBCL (2000-10-01 on sbcl-devel@lists.sourceforge.net):
391 (DEFTYPE FOO () 'SIMPLE-ARRAY)
392 (CONCATENATE 'FOO #(1 2) '(3))
393 => #<ARRAY-TYPE SIMPLE-ARRAY> is a bad type specifier for
395 The derived type specifier FOO should act the same way as the
396 built-in type SIMPLE-ARRAY here, but it doesn't. That problem
397 doesn't seem to exist for sequence types:
398 (DEFTYPE BAR () 'SIMPLE-VECTOR)
399 (CONCATENATE 'BAR #(1 2) '(3)) => #(1 2 3)
400 See also bug #46a./b., and discussion and patch sbcl-devel and
404 As reported by Winton Davies on a CMU CL mailing list 2000-01-10,
405 and reported for SBCL by Martin Atzmueller 2000-10-20: (TRACE GETHASH)
406 crashes SBCL. In general tracing anything which is used in the
407 implementation of TRACE is likely to have the same problem.
410 (DECLAIM (OPTIMIZE ..)) doesn't work properly inside LOCALLY forms.
413 As reported by Martin Atzmueller on sbcl-devel 26 Dec 2000,
414 ANSI says that WITH-OUTPUT-TO-STRING should have a keyword
415 :ELEMENT-TYPE, but in sbcl-0.6.9 this is not defined for
416 WITH-OUTPUT-TO-STRING.
419 ANSI says in one place that type declarations can be abbreviated even
420 when the type name is not a symbol, e.g.
421 (DECLAIM ((VECTOR T) *FOOVECTOR*))
422 SBCL doesn't support this. But ANSI says in another place that this
423 isn't allowed. So it's not clear this is a bug after all. (See the
424 e-mail on cmucl-help@cons.org on 2001-01-16 and 2001-01-17 from WHN
428 as pointed out by Dan Barlow on sbcl-devel 2000-07-02:
429 The PICK-TEMPORARY-FILE-NAME utility used by LOAD-FOREIGN uses
430 an easily guessable temporary filename in a way which might open
431 applications using LOAD-FOREIGN to hijacking by malicious users
432 on the same machine. Incantations for doing this safely are
433 floating around the net in various "how to write secure programs
434 despite Unix" documents, and it would be good to (1) fix this in
435 LOAD-FOREIGN, and (2) hunt for any other code which uses temporary
436 files and make it share the same new safe logic.
439 Functions are assigned names based on the context in which they're
440 defined. This is less than ideal for the functions which are
441 used to implement CLOS methods. E.g. the output of
442 (DESCRIBE 'PRINT-OBJECT) lists functions like
443 #<FUNCTION "DEF!STRUCT (TRACE-INFO (:MAKE-LOAD-FORM-FUN SB-KERNEL:JUST-DUMP-IT-NORMALLY) (:PRINT-OBJECT #))" {1020E49}>
445 #<FUNCTION "MACROLET ((FORCE-DELAYED-DEF!METHODS NIL #))" {1242871}>
446 It would be better if these functions' names always identified
447 them as methods, and identified their generic functions and
451 RANDOM-INTEGER-EXTRA-BITS=10 may not be large enough for the RANDOM
452 RNG to be high quality near RANDOM-FIXNUM-MAX; it looks as though
453 the mean of the distribution can be systematically O(0.1%) wrong.
454 Just increasing R-I-E-B is probably not a good solution, since
455 it would decrease efficiency more than is probably necessary. Perhaps
456 using some sort of accept/reject method would be better.
459 Internally the compiler sometimes evaluates
460 (sb-kernel:type/= (specifier-type '*) (specifier-type t))
461 (I stumbled across this when I added an
462 (assert (not (eq type1 *wild-type*)))
463 in the NAMED :SIMPLE-= type method.) '* isn't really a type, and
464 in a type context should probably be translated to T, and so it's
465 probably wrong to ask whether it's equal to the T type and then (using
466 the EQ type comparison in the NAMED :SIMPLE-= type method) return NIL.
467 (I haven't tried to investigate this bug enough to guess whether
468 there might be any user-level symptoms.)
471 Inconsistencies between derived and declared VALUES return types for
472 DEFUN aren't checked very well. E.g. the logic which successfully
473 catches problems like
474 (declaim (ftype (function (fixnum) float) foo))
476 (declare (type integer x))
477 (values x)) ; wrong return type, detected, gives warning, good!
479 (declaim (ftype (function (t) (values t t)) bar))
481 (values x)) ; wrong number of return values, no warning, bad!
482 The cause of this is seems to be that (1) the internal function
483 VALUES-TYPES-EQUAL-OR-INTERSECT used to make the check handles its
484 arguments symmetrically, and (2) when the type checking code was
485 written back when when SBCL's code was still CMU CL, the intent
487 (declaim (ftype (function (t) t) bar))
489 (values x x)) ; wrong number of return values; should give warning?
490 not be warned for, because a two-valued return value is considered
491 to be compatible with callers who expects a single value to be
492 returned. That intent is probably not appropriate for modern ANSI
493 Common Lisp, but fixing this might be complicated because of other
494 divergences between auld-style and new-style handling of
495 multiple-VALUES types. (Some issues related to this were discussed
496 on cmucl-imp at some length sometime in 2000.)
499 The facility for dumping a running Lisp image to disk gets confused
500 when run without the PURIFY option, and creates an unnecessarily large
501 core file (apparently representing memory usage up to the previous
502 high-water mark). Moreover, when the file is loaded, it confuses the
503 GC, so that thereafter memory usage can never be reduced below that
507 In sbcl-0.6.11.41 (and in all earlier SBCL, and in CMU
508 CL), out-of-line structure slot setters are horribly inefficient
509 whenever the type of the slot is declared, because out-of-line
510 structure slot setters are implemented as closures to save space,
511 so the compiler doesn't compile the type test into code, but
512 instead just saves the type in a lexical closure and interprets it
514 A proper solution involves deciding whether it's really worth
515 saving space by implementing structure slot accessors as closures.
516 (If it's not worth it, the problem vanishes automatically. If it
517 is worth it, there are hacks we could use to force type tests to
518 be compiled anyway, and even shared. E.g. we could implement
519 an EQUAL hash table mapping from types to compiled type tests,
520 and save the appropriate compiled type test as part of each lexical
521 closure; or we could make the lexical closures be placeholders
522 which overwrite their old definition as a lexical closure with
523 a new compiled definition the first time that they're called.)
524 As a workaround for the problem, #'(SETF FOO) expressions can
525 be replaced with (EFFICIENT-SETF-FUNCTION FOO), where
526 (defmacro efficient-setf-function (place-function-name)
527 (or #+sbcl (and (sb-impl::info :function :accessor-for place-function-name)
528 ;; a workaround for the problem, encouraging the
529 ;; inline expansion of the structure accessor, so
530 ;; that the compiler can optimize its type test
531 (let ((new-value (gensym "NEW-VALUE-"))
532 (structure-value (gensym "STRUCTURE-VALUE-")))
533 `(lambda (,new-value ,structure-value)
534 (setf (,place-function-name ,structure-value)
536 ;; no problem, can just use the ordinary expansion
537 `(function (setf ,place-function-name))))
540 There's apparently a bug in CEILING optimization which caused
541 Douglas Crosher to patch the CMU CL version. Martin Atzmueller
542 applied the patches to SBCL and they didn't seem to cause problems
543 (as reported sbcl-devel 2001-05-04). However, since the patches
544 modify nontrivial code which was apparently written incorrectly
545 the first time around, until regression tests are written I'm not
546 comfortable merging the patches in the CVS version of SBCL.
549 (DESCRIBE 'SB-ALIEN:DEF-ALIEN-TYPE) reports the macro argument list
553 in #<PACKAGE "SB-ALIEN">.
554 Macro-function: #<FUNCTION "DEF!MACRO DEF-ALIEN-TYPE" {19F4A39}>
555 Macro arguments: (#:whole-470 #:environment-471)
556 On Sat, May 26, 2001 09:45:57 AM CDT it was compiled from:
557 /usr/stuff/sbcl/src/code/host-alieneval.lisp
558 Created: Monday, March 12, 2001 07:47:43 AM CST
561 (TIME (ROOM T)) reports more than 200 Mbytes consed even for
562 a clean, just-started SBCL system. And it seems to be right:
563 (ROOM T) can bring a small computer to its knees for a *long*
564 time trying to GC afterwards. Surely there's some more economical
565 way to implement (ROOM T).
568 reported by Martin Atzmueller 2001-06-25; originally from CMU CL bugs
570 ;;; The compiler is flushing the argument type test, and the default
571 ;;; case in the cond, so that calling with say a fixnum 0 causes a
573 (declaim (optimize (safety 2) (speed 3)))
575 (declare (type (or string stream) x))
576 (cond ((typep x 'string) 'string)
577 ((typep x 'stream) 'stream)
580 The symptom in sbcl-0.6.12.42 on OpenBSD is actually (TST 0)=>STREAM
581 (not the SIGBUS reported in the comment) but that's broken too;
582 type declarations are supposed to be treated as assertions unless
583 SAFETY 0, so we should be getting a TYPE-ERROR.
586 reported by Martin Atzmueller 2001-06-25; originally from CMU CL bugs
588 (in-package :cl-user)
589 ;;; The following invokes a compiler error.
590 (declaim (optimize (speed 2) (debug 3)))
593 (unwind-protect nil)))
597 The error message in sbcl-0.6.12.42 is
598 internal error, failed AVER:
599 "(COMMON-LISP:EQ (SB!C::TN-ENVIRONMENT SB!C:TN) SB!C::TN-ENV)"
602 When the compiler inline expands functions, it may be that different
603 kinds of return values are generated from different code branches.
604 E.g. an inline expansion of POSITION generates integer results
605 from one branch, and NIL results from another. When that inline
606 expansion is used in a context where only one of those results
609 (aref *a1* (position x *a2*)))
610 and the compiler can't prove that the unacceptable branch is
611 never taken, then bogus type mismatch warnings can be generated.
612 If you need to suppress the type mismatch warnings, you can
613 suppress the inline expansion,
615 #+sbcl (declare (notinline position)) ; to suppress bug 117 bogowarnings
616 (aref *a1* (position x *a2*)))
617 or, sometimes, suppress them by declaring the result to be of an
620 (aref *a1* (the integer (position x *a2*))))
622 This is not a new compiler problem in 0.7.0, but the new compiler
623 transforms for FIND, POSITION, FIND-IF, and POSITION-IF make it
624 more conspicuous. If you don't need performance from these functions,
625 and the bogus warnings are a nuisance for you, you can return to
626 your pre-0.7.0 state of grace with
627 #+sbcl (declaim (notinline find position find-if position-if)) ; bug 117..
630 as reported by Eric Marsden on cmucl-imp@cons.org 2001-08-14:
631 (= (FLOAT 1 DOUBLE-FLOAT-EPSILON)
632 (+ (FLOAT 1 DOUBLE-FLOAT-EPSILON) DOUBLE-FLOAT-EPSILON)) => T
633 when of course it should be NIL. (He says it only fails for X86,
634 not SPARC; dunno about Alpha.)
636 Also, "the same problem exists for LONG-FLOAT-EPSILON,
637 DOUBLE-FLOAT-NEGATIVE-EPSILON, LONG-FLOAT-NEGATIVE-EPSILON (though
638 for the -negative- the + is replaced by a - in the test)."
640 Raymond Toy comments that this is tricky on the X86 since its FPU
641 uses 80-bit precision internally.
644 Even in sbcl-0.pre7.x, which is supposed to be free of the old
645 non-ANSI behavior of treating the function return type inferred
646 from the current function definition as a declaration of the
647 return type from any function of that name, the return type of NIL
648 is attached to FOO in 120a above, and used to optimize code which
652 There was some sort of screwup in handling of
653 (IF (NOT (IGNORE-ERRORS ..))). E.g.
655 (if (not (ignore-errors
656 (make-pathname :host "foo"
660 (error "notunlessnot")))
661 The (NOT (IGNORE-ERRORS ..)) form evaluates to T, so this should be
662 printing "ok", but instead it's going to the ERROR. This problem
663 seems to've been introduced by MNA's HANDLER-CASE patch (sbcl-devel
664 2001-07-17) and as a workaround (put in sbcl-0.pre7.14.flaky4.12)
665 I reverted back to the old weird HANDLER-CASE code. However, I
666 think the problem looks like a compiler bug in handling RETURN-FROM,
667 so I left the MNA-patched code in HANDLER-CASE (suppressed with
668 #+NIL) and I'd like to go back to see whether this really is
669 a compiler bug before I delete this BUGS entry.
672 As of version 0.pre7.14, SBCL's implementation of MACROLET makes
673 the entire lexical environment at the point of MACROLET available
674 in the bodies of the macroexpander functions. In particular, it
675 allows the function bodies (which run at compile time) to try to
676 access lexical variables (which are only defined at runtime).
677 It doesn't even issue a warning, which is bad.
679 The SBCL behavior arguably conforms to the ANSI spec (since the
680 spec says that the behavior is undefined, ergo anything conforms).
681 However, it would be better to issue a compile-time error.
682 Unfortunately I (WHN) don't see any simple way to detect this
683 condition in order to issue such an error, so for the meantime
684 SBCL just does this weird broken "conforming" thing.
686 The ANSI standard says, in the definition of the special operator
688 The macro-expansion functions defined by MACROLET are defined
689 in the lexical environment in which the MACROLET form appears.
690 Declarations and MACROLET and SYMBOL-MACROLET definitions affect
691 the local macro definitions in a MACROLET, but the consequences
692 are undefined if the local macro definitions reference any
693 local variable or function bindings that are visible in that
695 Then it seems to contradict itself by giving the example
697 (macrolet ((fudge (z)
698 ;The parameters x and flag are not accessible
699 ; at this point; a reference to flag would be to
700 ; the global variable of that name.
701 ` (if flag (* ,z ,z) ,z)))
702 ;The parameters x and flag are accessible here.
706 The comment "a reference to flag would be to the global variable
707 of the same name" sounds like good behavior for the system to have.
708 but actual specification quoted above says that the actual behavior
712 (as reported by Gabe Garza on cmucl-help 2001-09-21)
714 (defun test-pred (x y)
718 (func (lambda () x)))
719 (print (eq func func))
720 (print (test-pred func func))
721 (delete func (list func))))
722 Now calling (TEST-CASE) gives output
725 (#<FUNCTION {500A9EF9}>)
726 Evidently Python thinks of the lambda as a code transformation so
727 much that it forgets that it's also an object.
730 The DEFSTRUCT section of the ANSI spec, in the :CONC-NAME section,
731 specifies a precedence rule for name collisions between slot accessors of
732 structure classes related by inheritance. As of 0.7.0, SBCL still
736 insufficient syntax checking in MACROLET:
738 (macrolet ((defmacro bar (z) `(+ z z)))
740 shouldn't compile without error (because of the extra DEFMACRO symbol).
743 As of sbcl-0.pre7.86.flaky7.3, the cross-compiler, and probably
744 the CL:COMPILE function (which is based on the same %COMPILE
745 mechanism) get confused by
747 (labels ((sxhash-number (x)
749 (fixnum (sxhash x)) ; through DEFTRANSFORM
750 (integer (sb!bignum:sxhash-bignum x))
751 (single-float (sxhash x)) ; through DEFTRANSFORM
752 (double-float (sxhash x)) ; through DEFTRANSFORM
753 #!+long-float (long-float (error "stub: no LONG-FLOAT"))
754 (ratio (let ((result 127810327))
755 (declare (type fixnum result))
756 (mixf result (sxhash-number (numerator x)))
757 (mixf result (sxhash-number (denominator x)))
759 (complex (let ((result 535698211))
760 (declare (type fixnum result))
761 (mixf result (sxhash-number (realpart x)))
762 (mixf result (sxhash-number (imagpart x)))
764 (sxhash-recurse (x &optional (depthoid +max-hash-depthoid+))
765 (declare (type index depthoid))
769 (mix (sxhash-recurse (car x) (1- depthoid))
770 (sxhash-recurse (cdr x) (1- depthoid)))
773 (if (typep x 'structure-object)
775 (sxhash ; through DEFTRANSFORM
776 (class-name (layout-class (%instance-layout x)))))
778 (symbol (sxhash x)) ; through DEFTRANSFORM
779 (number (sxhash-number x))
782 (simple-string (sxhash x)) ; through DEFTRANSFORM
783 (string (%sxhash-substring x))
784 (bit-vector (let ((result 410823708))
785 (declare (type fixnum result))
786 (dotimes (i (min depthoid (length x)))
787 (mixf result (aref x i)))
789 (t (logxor 191020317 (sxhash (array-rank x))))))
792 (sxhash (char-code x)))) ; through DEFTRANSFORM
795 complaining "function called with two arguments, but wants exactly
796 one" about SXHASH-RECURSE. (This might not be strictly a new bug,
797 since IIRC post-fork CMU CL has also had problems with &OPTIONAL
798 arguments in FLET/LABELS: it might be an old Python bug which is
799 only exercised by the new arrangement of the SBCL compiler.)
802 Ideally, uninterning a symbol would allow it, and its associated
803 FDEFINITION and PROCLAIM data, to be reclaimed by the GC. However,
804 at least as of sbcl-0.7.0, this isn't the case. Information about
805 FDEFINITIONs and PROCLAIMed properties is stored in globaldb.lisp
806 essentially in ordinary (non-weak) hash tables keyed by symbols.
807 Thus, once a system has an entry in this system, it tends to live
808 forever, even when it is uninterned and all other references to it
812 (reported by Arnaud Rouanet on cmucl-imp 2001-12-18)
813 (defmethod foo ((x integer))
815 (defmethod foo :around ((x integer))
818 Now (FOO 3) should return 3, but instead it returns 4.
821 (reported by Alexey Dejneka sbcl-devel 2002-01-03)
823 SUBTYPEP does not work well with redefined classes:
832 * (defclass b (a) ())
845 This bug was fixed in sbcl-0.7.4.1 by invalidating the PCL wrapper
846 class upon redefinition. Unfortunately, doing so causes bug #176 to
847 appear. Pending further investication, one or other of these bugs
848 might be present at any given time.
851 Pretty-printing nested backquotes doesn't work right, as
852 reported by Alexey Dejneka sbcl-devel 2002-01-13:
854 ``(FOO SB-IMPL::BACKQ-COMMA-AT S)
855 * (lisp-implementation-version)
859 (as reported by Lynn Quam on cmucl-imp ca. 2002-01-16)
860 %NATURALIZE-C-STRING conses a lot, like 16 bytes per byte
861 of the naturalized string. We could probably port the patches
862 from the cmucl-imp mailing list.
865 (reported by Jesse Bouwman 2001-10-24 through the unfortunately
866 prominent SourceForge web/db bug tracking system, which is
867 unfortunately not a reliable way to get a timely response from
868 the SBCL maintainers)
869 In the course of trying to build a test case for an
870 application error, I encountered this behavior:
871 If you start up sbcl, and then lay on CTRL-C for a
872 minute or two, the lisp process will eventually say:
873 %PRIMITIVE HALT called; the party is over.
874 and throw you into the monitor. If I start up lisp,
875 attach to the process with strace, and then do the same
876 (abusive) thing, I get instead:
877 access failure in heap page not marked as write-protected
878 and the monitor again. I don't know enough to have the
879 faintest idea of what is going on here.
880 This is with sbcl 6.12, uname -a reports:
881 Linux prep 2.2.19 #4 SMP Tue Apr 24 13:59:52 CDT 2001 i686 unknown
882 I (WHN) have verified that the same thing occurs on sbcl-0.pre7.141
883 under OpenBSD 2.9 on my X86 laptop. Do be patient when you try it:
884 it took more than two minutes (but less than five) for me.
887 (This was once known as IR1-4, but it lived on even after the
888 IR1 interpreter went to the big bit bucket in the sky.)
889 The system accepts DECLAIM in most places where DECLARE would be
890 accepted, without even issuing a warning. ANSI allows this, but since
891 it's fairly easy to mistype DECLAIM instead of DECLARE, and the
892 meaning is rather different, and it's unlikely that the user
893 has a good reason for doing DECLAIM not at top level, it would be
894 good to issue a STYLE-WARNING when this happens. A possible
895 fix would be to issue STYLE-WARNINGs for DECLAIMs not at top level,
896 or perhaps to issue STYLE-WARNINGs for any EVAL-WHEN not at top level.
897 [This is considered an IR1-interpreter-related bug because until
898 EVAL-WHEN is rewritten, which won't happen until after the IR1
899 interpreter is gone, the system's notion of what's a top-level form
900 and what's not will remain too confused to fix this problem.]
903 ANSI allows types `(COMPLEX ,FOO) to use very hairy values for
904 FOO, e.g. (COMPLEX (AND REAL (SATISFIES ODDP))). The old CMU CL
905 COMPLEX implementation didn't deal with this, and hasn't been
906 upgraded to do so. (This doesn't seem to be a high priority
907 conformance problem, since seems hard to construct useful code
911 Floating point errors are reported poorly. E.g. on x86 OpenBSD
914 debugger invoked on condition of type SB-KERNEL:FLOATING-POINT-EXCEPTION:
915 An arithmetic error SB-KERNEL:FLOATING-POINT-EXCEPTION was signalled.
916 No traps are enabled? How can this be?
917 It should be possible to be much more specific (overflow, division
918 by zero, etc.) and of course the "How can this be?" should be fixable.
920 See also bugs #45.c and #183
923 In sbcl-0.7.1.3 on x86, COMPILE-FILE on the file
924 (in-package :cl-user)
927 (defstruct foo bar bletch)
929 (labels ((kidify1 (kid)
937 (declare (inline kid-frob))
940 (the simple-vector (foo-bar perd)))))
942 debugger invoked on condition of type TYPE-ERROR:
943 The value NIL is not of type SB-C::NODE.
944 The location of this failure has moved around as various related
945 issues were cleaned up. As of sbcl-0.7.1.9, it occurs in
946 NODE-BLOCK called by LAMBDA-COMPONENT called by IR2-CONVERT-CLOSURE.
949 (essentially the same problem as a CMU CL bug reported by Martin
950 Cracauer on cmucl-imp 2002-02-19)
951 There is a hole in structure slot type checking. Compiling and LOADing
952 (declaim (optimize safety))
954 (bla 0 :type fixnum))
956 (let ((foo (make-foo)))
957 (setf (foo-bla foo) '(1 . 1))
958 (format t "Is ~a of type ~a a cons? => ~a~%"
960 (type-of (foo-bla foo))
961 (consp (foo-bla foo)))))
963 should signal an error, but in sbcl-0.7.1.21 instead gives the output
964 Is (1 . 1) of type CONS a cons? => NIL
965 without signalling an error.
968 Functions SUBTYPEP, TYPEP, UPGRADED-ARRAY-ELEMENT-TYPE, and
969 UPGRADED-COMPLEX-PART-TYPE should have an optional environment argument.
970 (reported by Alexey Dejneka sbcl-devel 2002-04-12)
973 (reported by Robert E. Brown 2002-04-16)
974 When a function is called with too few arguments, causing the
975 debugger to be entered, the uninitialized slots in the bad call frame
976 seem to cause GCish problems, being interpreted as tagged data even
977 though they're not. In particular, executing ROOM in the
978 debugger at that point causes AVER failures:
981 * (lisp-implementation-version)
987 failed AVER: "(SAP= CURRENT END)"
988 (Christophe Rhodes reports that this doesn't occur on the SPARC, which
989 isn't too surprising since there are many differences in stack
990 implementation and GC conservatism between the X86 and other ports.)
994 (in-package :cl-user)
996 (defmethod permanentize ((uustk uustk))
997 (flet ((frob (hash-table test-for-deletion)
999 (obj-entry.stale? (oe)
1000 (destructuring-bind (key . datum) oe
1001 (declare (type simple-vector key))
1002 (deny0 (void? datum))
1003 (some #'stale? key))))
1004 (declare (inline frob obj-entry.stale?))
1005 (frob (uustk.args-hash->obj-alist uustk)
1007 (frob (uustk.hash->memoized-objs-list uustk)
1010 in sbcl-0.7.3.11 causes an assertion failure,
1013 (AND (NULL (BLOCK-SUCC B))
1014 (NOT (BLOCK-DELETE-P B))
1015 (NOT (EQ B (COMPONENT-HEAD #)))))"
1018 In sbcl-0.7.3.11, compiling the (illegal) code
1019 (in-package :cl-user)
1020 (defmethod prove ((uustk uustk))
1021 (zap ((frob () nil))
1023 gives the (not terribly clear) error message
1025 ; (during macroexpansion of (DEFMETHOD PROVE ...))
1026 ; can't get template for (FROB NIL NIL)
1027 The problem seems to be that the code walker used by the DEFMETHOD
1028 macro is unhappy with the illegal syntax in the method body, and
1029 is giving an unclear error message.
1032 (reported by Dan Barlow on sbcl-devel 2002-05-10)
1033 In sbcl-0.7.3.12, doing
1034 (defstruct foo bar baz)
1035 (compile nil (lambda (x) (or x (foo-baz x))))
1037 debugger invoked on condition of type SB-INT:BUG:
1038 full call to SB-KERNEL:%INSTANCE-REF
1039 This is probably a bug in SBCL itself. [...]
1040 Since this is a reasonable user error, it shouldn't be reported as
1044 (reported by Pierre Mai while investigating bug 47):
1045 (DEFCLASS FOO () ((A :SILLY T)))
1046 signals a SIMPLE-ERROR, not a PROGRAM-ERROR.
1049 sbcl's treatment of at least macro lambda lists is too permissive;
1050 e.g., in sbcl-0.7.3.7:
1051 (defmacro foo (&rest rest bar) `(,bar ,rest))
1052 (macroexpand '(foo quux zot)) -> (QUUX (QUUX ZOT))
1053 whereas section 3.4.4 of the CLHS doesn't allow required parameters
1054 to come after the rest argument.
1057 The compiler sometimes tries to constant-fold expressions before
1058 it checks to see whether they can be reached. This can lead to
1059 bogus warnings about errors in the constant folding, e.g. in code
1062 (WRITE-STRING (> X 0) "+" "0"))
1063 compiled in a context where the compiler can prove that X is NIL,
1064 and the compiler complains that (> X 0) causes a type error because
1065 NIL isn't a valid argument to #'>. Until sbcl-0.7.4.10 or so this
1066 caused a full WARNING, which made the bug really annoying because then
1067 COMPILE and COMPILE-FILE returned FAILURE-P=T for perfectly legal
1068 code. Since then the warning has been downgraded to STYLE-WARNING,
1069 so it's still a bug but at least it's a little less annoying.
1072 reported by Alexey Dejneka 08 Jun 2002 in sbcl-devel:
1073 Playing with McCLIM, I've received an error "Unbound variable WRAPPER
1074 in SB-PCL::CHECK-WRAPPER-VALIDITY".
1075 (defun check-wrapper-validity (instance)
1076 (let* ((owrapper (wrapper-of instance)))
1077 (if (not (invalid-wrapper-p owrapper))
1079 (let* ((state (wrapper-state wrapper)) ; !!!
1081 I've tried to replace it with OWRAPPER, but now OBSOLETE-INSTANCE-TRAP
1082 breaks with "NIL is not of type SB-KERNEL:LAYOUT".
1084 partial fix: The undefined variable WRAPPER resulted from an error
1085 in recent refactoring, as can be seen by comparing to the code in e.g.
1086 sbcl-0.7.2. Replacing WRAPPER with OWRAPPER (done by WHN in sbcl-0.7.4.22)
1087 should bring the code back to its behavior as of sbcl-0.7.2, but
1088 that still leaves the OBSOLETE-INSTANCE-TRAP bug. An example of
1089 input which triggers that bug is
1091 (let ((lastname (intern (format nil "C~D" (1- i))))
1092 (name (intern (format nil "C~D" i))))
1093 (eval `(defclass ,name
1094 (,@(if (= i 0) nil (list lastname)))
1096 (eval `(defmethod initialize-instance :after ((x ,name) &rest any)
1097 (declare (ignore any))))))
1099 (defclass c0 (b) ())
1100 (make-instance 'c19)
1104 178: "AVER failure compiling confused THEs in FUNCALL"
1105 In sbcl-0.7.4.24, compiling
1107 (funcall (the function (the standard-object x))))
1110 "(AND (EQ (IR2-CONTINUATION-PRIMITIVE-TYPE 2CONT) FUNCTION-PTYPE) (EQ CHECK T))"
1111 This variant compiles OK, though:
1112 (defun bug178alternative (x)
1113 (funcall (the nil x)))
1115 181: "bad type specifier drops compiler into debugger"
1117 (in-package :cl-user)
1119 (declare (type 0 x))
1122 bad thing to be a type specifier: 0
1123 which seems fine, but also enters the debugger (instead of having
1124 the compiler handle the error, convert it into a COMPILER-ERROR, and
1125 continue compiling) which seems wrong.
1127 183: "IEEE floating point issues"
1128 Even where floating point handling is being dealt with relatively
1129 well (as of sbcl-0.7.5, on sparc/sunos and alpha; see bug #146), the
1130 accrued-exceptions and current-exceptions part of the fp control
1131 word don't seem to bear much relation to reality. E.g. on
1135 debugger invoked on condition of type DIVISION-BY-ZERO:
1136 arithmetic error DIVISION-BY-ZERO signalled
1137 0] (sb-vm::get-floating-point-modes)
1139 (:TRAPS (:OVERFLOW :INVALID :DIVIDE-BY-ZERO)
1140 :ROUNDING-MODE :NEAREST
1141 :CURRENT-EXCEPTIONS NIL
1142 :ACCRUED-EXCEPTIONS (:INEXACT)
1145 * (sb-vm::get-floating-point-modes)
1146 (:TRAPS (:OVERFLOW :INVALID :DIVIDE-BY-ZERO)
1147 :ROUNDING-MODE :NEAREST
1148 :CURRENT-EXCEPTIONS (:INEXACT)
1149 :ACCRUED-EXCEPTIONS (:INEXACT)
1152 185: "top-level forms at the REPL"
1153 * (locally (defstruct foo (a 0 :type fixnum)))
1156 ; (in macroexpansion of (SB-KERNEL::%DELAYED-GET-COMPILER-LAYOUT BAR))
1157 however, compiling and loading the same expression in a file works
1160 187: "type inference confusion around DEFTRANSFORM time"
1161 (reported even more verbosely on sbcl-devel 2002-06-28 as "strange
1162 bug in DEFTRANSFORM")
1163 After the file below is compiled and loaded in sbcl-0.7.5, executing
1164 (TCX (MAKE-ARRAY 4 :FILL-POINTER 2) 0)
1165 at the REPL returns an adjustable vector, which is wrong. Presumably
1166 somehow the DERIVE-TYPE information for the output values of %WAD is
1167 being mispropagated as a type constraint on the input values of %WAD,
1168 and so causing the type test to be optimized away. It's unclear how
1169 hand-expanding the DEFTRANSFORM would change this, but it suggests
1170 the DEFTRANSFORM machinery (or at least the way DEFTRANSFORMs are
1171 invoked at a particular phase) is involved.
1172 (cl:in-package :sb-c)
1173 (eval-when (:compile-toplevel)
1174 ;;; standin for %DATA-VECTOR-AND-INDEX
1175 (defknown %dvai (array index)
1177 (foldable flushable))
1178 (deftransform %dvai ((array index)
1182 (let* ((atype (continuation-type array))
1183 (eltype (array-type-specialized-element-type atype)))
1184 (when (eq eltype *wild-type*)
1185 (give-up-ir1-transform
1186 "specialized array element type not known at compile-time"))
1187 (when (not (array-type-complexp atype))
1188 (give-up-ir1-transform "SIMPLE array!"))
1189 `(if (array-header-p array)
1190 (%wad array index nil)
1191 (values array index))))
1192 ;;; standin for %WITH-ARRAY-DATA
1193 (defknown %wad (array index (or index null))
1194 (values (simple-array * (*)) index index index)
1195 (foldable flushable))
1196 ;;; (Commenting out this optimizer causes the bug to go away.)
1197 (defoptimizer (%wad derive-type) ((array start end))
1198 (let ((atype (continuation-type array)))
1199 (when (array-type-p atype)
1200 (values-specifier-type
1201 `(values (simple-array ,(type-specifier
1202 (array-type-specialized-element-type atype))
1204 index index index)))))
1206 (defun %wad (array start end)
1207 (format t "~&in %WAD~%")
1208 (%with-array-data array start end))
1209 (cl:in-package :cl-user)
1211 (declare (type (vector t) v))
1212 (declare (notinline sb-kernel::%with-array-data))
1213 ;; (Hand-expending DEFTRANSFORM %DVAI here also causes the bug to
1217 188: "compiler performance fiasco involving type inference and UNION-TYPE"
1218 (In sbcl-0.7.6.10, DEFTRANSFORM CONCATENATE was commented out until this
1219 bug could be fixed properly, so you won't see the bug unless you restore
1220 the DEFTRANSFORM by hand.) In sbcl-0.7.5.11 on a 700 MHz Pentium III,
1224 (declare (optimize (safety 3)))
1225 (declare (optimize (compilation-speed 2)))
1226 (declare (optimize (speed 1) (debug 1) (space 1)))
1227 (let ((fn "if-this-file-exists-the-universe-is-strange"))
1228 (load fn :if-does-not-exist nil)
1229 (load (concatenate 'string fn ".lisp") :if-does-not-exist nil)
1230 (load (concatenate 'string fn ".fasl") :if-does-not-exist nil)
1231 (load (concatenate 'string fn ".misc-garbage")
1232 :if-does-not-exist nil)))))
1234 134.552 seconds of real time
1235 133.35156 seconds of user run time
1236 0.03125 seconds of system run time
1237 [Run times include 2.787 seconds GC run time.]
1239 246883368 bytes consed.
1240 BACKTRACE from Ctrl-C in the compilation shows that the compiler is
1241 thinking about type relationships involving types like
1243 (OR (INTEGER 576 576)
1254 190: "PPC/Linux pipe? buffer? bug"
1255 In sbcl-0.7.6, the run-program.test.sh test script sometimes hangs
1256 on the PPC/Linux platform, waiting for a zombie env process. This
1257 is a classic symptom of buffer filling and deadlock, but it seems
1258 only sporadically reproducible.
1260 191: "Miscellaneous PCL deficiencies"
1261 (reported by Alexey Dejneka sbcl-devel 2002-08-04)
1262 a. DEFCLASS does not inform the compiler about generated
1263 functions. Compiling a file with
1264 (DEFCLASS A-CLASS ()
1266 (DEFUN A-CLASS-X (A)
1267 (WITH-SLOTS (A-CLASS-X) A
1269 results in a STYLE-WARNING:
1271 SB-SLOT-ACCESSOR-NAME::|COMMON-LISP-USER A-CLASS-X slot READER|
1273 APD's fix for this was checked in to sbcl-0.7.6.20, but Pierre
1274 Mai points out that the declamation of functions is in fact
1275 incorrect in some cases (most notably for structure
1276 classes). This means that at present erroneous attempts to use
1277 WITH-SLOTS and the like on classes with metaclass STRUCTURE-CLASS
1278 won't get the corresponding STYLE-WARNING.
1279 c. the examples in CLHS 7.6.5.1 (regarding generic function lambda
1280 lists and &KEY arguments) do not signal errors when they should.
1282 192: "Python treats free type declarations as promises."
1283 a. original report by Alexey Dejneka (on sbcl-devel 2002-08-26):
1284 (declaim (optimize (speed 0) (safety 3)))
1288 (locally (declare (single-float x))
1290 Now (F NIL) correctly gives a type error, but (F 100) gives
1291 a segmentation violation.
1292 b. same fundamental problem in a different way, easy to stumble
1293 across if you mistype and declare the wrong index in
1294 (DOTIMES (I ...) (DOTIMES (J ...) (DECLARE ...) ...)):
1295 (declaim (optimize (speed 1) (safety 3)))
1296 (defun trust-assertion (i)
1298 (declare (type (mod 4) i)) ; when commented out, behavior changes!
1301 (trust-assertion 6) ; prints nothing unless DECLARE is commented out
1303 193: "unhelpful CLOS error reporting when the primary method is missing"
1305 (defmethod foo :before ((x t)) (print x))
1306 is the only method defined on FOO, the error reporting when e.g.
1308 is relatively unhelpful:
1309 There is no primary method for the generic function
1310 #<STANDARD-GENERIC-FUNCTION FOO (1)>.
1311 with the offending argument nowhere visible in the backtrace. This
1312 continues even if there *are* primary methods, just not for the
1313 specified arg type, e.g.
1314 (defmethod foo ((x character)) (print x))
1315 (defmethod foo ((x string)) (print x))
1316 (defmethod foo ((x pathname)) ...)
1317 In that case it could be very helpful to know what argument value is
1318 falling through the cracks of the defined primary methods, but the
1319 error message stays the same (even BACKTRACE doesn't tell you what the
1320 bad argument value is).
1322 194: "no error from (THE REAL '(1 2 3)) in some cases"
1323 (Actually this entry is probably two separate bugs, as
1324 Alexey Dejneka commented on sbcl-devel 2002-09-03:)
1325 I don't think that placing these two bugs in one entry is
1326 a good idea: they have different explanations. The second
1327 (min 1 nil) is caused by flushing of unused code--IDENTITY
1328 can do nothing with it. So it is really bug 122. The first
1329 (min nil) is due to M-V-PROG1: substituting a continuation
1330 for the result, it forgets about type assertion. The purpose
1331 of IDENTITY is to save the restricted continuation from
1332 inaccurate transformations.
1334 (multiple-value-prog1 (progn (the real '(1 2 3))))
1335 returns (1 2 3) instead of signalling an error. Also in sbcl-0.7.7.9,
1336 a more complicated instance of this bug kept
1337 (IGNORE-ERRORS (MIN '(1 2 3))) from returning NIL as it should when
1338 the MIN source transform expanded to (THE REAL '(1 2 3)), because
1339 (IGNORE-ERRORS (THE REAL '(1 2 3))) returns (1 2 3).
1340 Alexey Dejneka pointed out that
1341 (IGNORE-ERRORS (IDENTITY (THE REAL '(1 2 3)))) works as it should.
1342 (IGNORE-ERRORS (VALUES (THE REAL '(1 2 3)))) also works as it should.
1343 Perhaps this is another case of VALUES type intersections behaving
1345 When I (WHN) tried to use the VALUES trick to work around this bug
1346 in the MIN source transform, it didn't work for
1347 (assert (null (ignore-errors (min 1 #(1 2 3)))))
1348 Hand-expanding the source transform, I get
1349 (assert (null (ignore-errors
1351 (arg2 (identity (the real #(1 2 3)))))
1352 (if (< arg1 arg2) arg1 arg2)))))
1353 which fails (i.e. the assertion fails, because the IGNORE-ERRORS
1354 doesn't report MIN signalling a type error). At the REPL
1355 (null (ignore-errors
1357 (arg2 (identity (the real #(1 2 3)))))
1358 (if (< arg1 arg2) arg1 arg2))))
1360 but when this expression is used as the body of (DEFUN FOO () ...)
1363 195: "confusing reporting of not-a-REAL TYPE-ERRORs from THE REAL"
1364 In sbcl-0.7.7.10, (THE REAL #(1 2 3)) signals a type error which
1365 prints as "This is not a (OR SINGLE-FLOAT DOUBLE-FLOAT RATIONAL)".
1366 The (OR SINGLE-FLOAT DOUBLE-FLOAT RATIONAL) representation of
1367 REAL is unnecessarily confusing, especially since it relies on
1368 internal implementation knowledge that even with SHORT-FLOAT
1369 and LONG-FLOAT left out of the union, this type is equal to REAL.
1370 So it'd be better just to say "This is not a REAL".
1372 196: "confusing error message for unREAL second arg to ATAN"
1373 (reported by Alexey Dejneka sbcl-devel 2002-09-04)
1376 debugger invoked on condition of type SIMPLE-TYPE-ERROR:
1377 Argument X is not a NUMBER: #C(1 2)
1378 (The actual type problem is that argument Y is not a REAL.)
1380 DEFUNCT CATEGORIES OF BUGS
1382 These labels were used for bugs related to the old IR1 interpreter.
1383 The # values reached 6 before the category was closed down.