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 (probably related to bug #70; maybe related to bug #109)
385 As reported by Carl Witty on submit@bugs.debian.org 1999-05-08,
387 (in-package "CL-USER")
388 (defun equal-terms (termx termy)
390 ((alpha-equal-bound-term-lists (listx listy)
391 (or (and (null listx) (null listy))
393 (let ((bindings-x (bindings-of-bound-term (car listx)))
394 (bindings-y (bindings-of-bound-term (car listy))))
395 (if (and (null bindings-x) (null bindings-y))
396 (alpha-equal-terms (term-of-bound-term (car listx))
397 (term-of-bound-term (car listy)))
398 (and (= (length bindings-x) (length bindings-y))
400 (enter-binding-pairs (bindings-of-bound-term (car listx))
401 (bindings-of-bound-term (car listy)))
402 (alpha-equal-terms (term-of-bound-term (car listx))
403 (term-of-bound-term (car listy)))
404 (exit-binding-pairs (bindings-of-bound-term (car listx))
405 (bindings-of-bound-term (car listy)))))))
406 (alpha-equal-bound-term-lists (cdr listx) (cdr listy)))))
408 (alpha-equal-terms (termx termy)
409 (if (and (variable-p termx)
411 (equal-bindings (id-of-variable-term termx)
412 (id-of-variable-term termy))
413 (and (equal-operators-p (operator-of-term termx) (operator-of-term termy))
414 (alpha-equal-bound-term-lists (bound-terms-of-term termx)
415 (bound-terms-of-term termy))))))
419 (with-variable-invocation (alpha-equal-terms termx termy))))))
420 causes an assertion failure
421 The assertion (EQ (C::LAMBDA-TAIL-SET C::CALLER)
422 (C::LAMBDA-TAIL-SET (C::LAMBDA-HOME C::CALLEE))) failed.
424 Bob Rogers reports (1999-07-28 on cmucl-imp@cons.org) a smaller test
425 case with the same problem:
426 (defun parse-fssp-alignment ()
427 ;; Given an FSSP alignment file named by the argument . . .
428 (labels ((get-fssp-char ()
432 ;; Stub body, enough to tickle the bug.
433 (list (read-fssp-char)
437 ANSI specifies that the RESULT-TYPE argument of CONCATENATE must be
438 a subtype of SEQUENCE, but CONCATENATE doesn't check this properly:
439 (CONCATENATE 'SIMPLE-ARRAY #(1 2) '(3)) => #(1 2 3)
440 This also leads to funny behavior when derived type specifiers
441 are used, as originally reported by Milan Zamazal for CMU CL (on the
442 Debian bugs mailing list (?) 2000-02-27), then reported by Martin
443 Atzmueller for SBCL (2000-10-01 on sbcl-devel@lists.sourceforge.net):
444 (DEFTYPE FOO () 'SIMPLE-ARRAY)
445 (CONCATENATE 'FOO #(1 2) '(3))
446 => #<ARRAY-TYPE SIMPLE-ARRAY> is a bad type specifier for
448 The derived type specifier FOO should act the same way as the
449 built-in type SIMPLE-ARRAY here, but it doesn't. That problem
450 doesn't seem to exist for sequence types:
451 (DEFTYPE BAR () 'SIMPLE-VECTOR)
452 (CONCATENATE 'BAR #(1 2) '(3)) => #(1 2 3)
453 See also bug #46a./b., and discussion and patch sbcl-devel and
457 As reported by Winton Davies on a CMU CL mailing list 2000-01-10,
458 and reported for SBCL by Martin Atzmueller 2000-10-20: (TRACE GETHASH)
459 crashes SBCL. In general tracing anything which is used in the
460 implementation of TRACE is likely to have the same problem.
463 (probably related to bug #65; maybe related to bug #109)
464 The compiler doesn't like &OPTIONAL arguments in LABELS and FLET
466 (DEFUN FIND-BEFORE (ITEM SEQUENCE &KEY (TEST #'EQL))
467 (LABELS ((FIND-ITEM (OBJ SEQ TEST &OPTIONAL (VAL NIL))
468 (LET ((ITEM (FIRST SEQ)))
471 ((FUNCALL TEST OBJ ITEM)
474 (FIND-ITEM OBJ (REST SEQ) TEST (NCONC VAL `(,ITEM))))))))
475 (FIND-ITEM ITEM SEQUENCE TEST)))
476 from David Young's bug report on cmucl-help@cons.org 30 Nov 2000
477 causes sbcl-0.6.9 to fail with
478 error in function SB-KERNEL:ASSERT-ERROR:
479 The assertion (EQ (SB-C::LAMBDA-TAIL-SET SB-C::CALLER)
480 (SB-C::LAMBDA-TAIL-SET
481 (SB-C::LAMBDA-HOME SB-C::CALLEE))) failed.
484 (DECLAIM (OPTIMIZE ..)) doesn't work properly inside LOCALLY forms.
487 As reported by Martin Atzmueller on sbcl-devel 26 Dec 2000,
488 ANSI says that WITH-OUTPUT-TO-STRING should have a keyword
489 :ELEMENT-TYPE, but in sbcl-0.6.9 this is not defined for
490 WITH-OUTPUT-TO-STRING.
493 ANSI says in one place that type declarations can be abbreviated even
494 when the type name is not a symbol, e.g.
495 (DECLAIM ((VECTOR T) *FOOVECTOR*))
496 SBCL doesn't support this. But ANSI says in another place that this
497 isn't allowed. So it's not clear this is a bug after all. (See the
498 e-mail on cmucl-help@cons.org on 2001-01-16 and 2001-01-17 from WHN
502 as pointed out by Dan Barlow on sbcl-devel 2000-07-02:
503 The PICK-TEMPORARY-FILE-NAME utility used by LOAD-FOREIGN uses
504 an easily guessable temporary filename in a way which might open
505 applications using LOAD-FOREIGN to hijacking by malicious users
506 on the same machine. Incantations for doing this safely are
507 floating around the net in various "how to write secure programs
508 despite Unix" documents, and it would be good to (1) fix this in
509 LOAD-FOREIGN, and (2) hunt for any other code which uses temporary
510 files and make it share the same new safe logic.
513 Functions are assigned names based on the context in which they're
514 defined. This is less than ideal for the functions which are
515 used to implement CLOS methods. E.g. the output of
516 (DESCRIBE 'PRINT-OBJECT) lists functions like
517 #<FUNCTION "DEF!STRUCT (TRACE-INFO (:MAKE-LOAD-FORM-FUN SB-KERNEL:JUST-DUMP-IT-NORMALLY) (:PRINT-OBJECT #))" {1020E49}>
519 #<FUNCTION "MACROLET ((FORCE-DELAYED-DEF!METHODS NIL #))" {1242871}>
520 It would be better if these functions' names always identified
521 them as methods, and identified their generic functions and
525 RANDOM-INTEGER-EXTRA-BITS=10 may not be large enough for the RANDOM
526 RNG to be high quality near RANDOM-FIXNUM-MAX; it looks as though
527 the mean of the distribution can be systematically O(0.1%) wrong.
528 Just increasing R-I-E-B is probably not a good solution, since
529 it would decrease efficiency more than is probably necessary. Perhaps
530 using some sort of accept/reject method would be better.
533 Internally the compiler sometimes evaluates
534 (sb-kernel:type/= (specifier-type '*) (specifier-type t))
535 (I stumbled across this when I added an
536 (assert (not (eq type1 *wild-type*)))
537 in the NAMED :SIMPLE-= type method.) '* isn't really a type, and
538 in a type context should probably be translated to T, and so it's
539 probably wrong to ask whether it's equal to the T type and then (using
540 the EQ type comparison in the NAMED :SIMPLE-= type method) return NIL.
541 (I haven't tried to investigate this bug enough to guess whether
542 there might be any user-level symptoms.)
545 Inconsistencies between derived and declared VALUES return types for
546 DEFUN aren't checked very well. E.g. the logic which successfully
547 catches problems like
548 (declaim (ftype (function (fixnum) float) foo))
550 (declare (type integer x))
551 (values x)) ; wrong return type, detected, gives warning, good!
553 (declaim (ftype (function (t) (values t t)) bar))
555 (values x)) ; wrong number of return values, no warning, bad!
556 The cause of this is seems to be that (1) the internal function
557 VALUES-TYPES-EQUAL-OR-INTERSECT used to make the check handles its
558 arguments symmetrically, and (2) when the type checking code was
559 written back when when SBCL's code was still CMU CL, the intent
561 (declaim (ftype (function (t) t) bar))
563 (values x x)) ; wrong number of return values; should give warning?
564 not be warned for, because a two-valued return value is considered
565 to be compatible with callers who expects a single value to be
566 returned. That intent is probably not appropriate for modern ANSI
567 Common Lisp, but fixing this might be complicated because of other
568 divergences between auld-style and new-style handling of
569 multiple-VALUES types. (Some issues related to this were discussed
570 on cmucl-imp at some length sometime in 2000.)
573 The facility for dumping a running Lisp image to disk gets confused
574 when run without the PURIFY option, and creates an unnecessarily large
575 core file (apparently representing memory usage up to the previous
576 high-water mark). Moreover, when the file is loaded, it confuses the
577 GC, so that thereafter memory usage can never be reduced below that
581 In sbcl-0.6.11.41 (and in all earlier SBCL, and in CMU
582 CL), out-of-line structure slot setters are horribly inefficient
583 whenever the type of the slot is declared, because out-of-line
584 structure slot setters are implemented as closures to save space,
585 so the compiler doesn't compile the type test into code, but
586 instead just saves the type in a lexical closure and interprets it
588 A proper solution involves deciding whether it's really worth
589 saving space by implementing structure slot accessors as closures.
590 (If it's not worth it, the problem vanishes automatically. If it
591 is worth it, there are hacks we could use to force type tests to
592 be compiled anyway, and even shared. E.g. we could implement
593 an EQUAL hash table mapping from types to compiled type tests,
594 and save the appropriate compiled type test as part of each lexical
595 closure; or we could make the lexical closures be placeholders
596 which overwrite their old definition as a lexical closure with
597 a new compiled definition the first time that they're called.)
598 As a workaround for the problem, #'(SETF FOO) expressions can
599 be replaced with (EFFICIENT-SETF-FUNCTION FOO), where
600 (defmacro efficient-setf-function (place-function-name)
601 (or #+sbcl (and (sb-impl::info :function :accessor-for place-function-name)
602 ;; a workaround for the problem, encouraging the
603 ;; inline expansion of the structure accessor, so
604 ;; that the compiler can optimize its type test
605 (let ((new-value (gensym "NEW-VALUE-"))
606 (structure-value (gensym "STRUCTURE-VALUE-")))
607 `(lambda (,new-value ,structure-value)
608 (setf (,place-function-name ,structure-value)
610 ;; no problem, can just use the ordinary expansion
611 `(function (setf ,place-function-name))))
614 There's apparently a bug in CEILING optimization which caused
615 Douglas Crosher to patch the CMU CL version. Martin Atzmueller
616 applied the patches to SBCL and they didn't seem to cause problems
617 (as reported sbcl-devel 2001-05-04). However, since the patches
618 modify nontrivial code which was apparently written incorrectly
619 the first time around, until regression tests are written I'm not
620 comfortable merging the patches in the CVS version of SBCL.
623 (DESCRIBE 'SB-ALIEN:DEF-ALIEN-TYPE) reports the macro argument list
627 in #<PACKAGE "SB-ALIEN">.
628 Macro-function: #<FUNCTION "DEF!MACRO DEF-ALIEN-TYPE" {19F4A39}>
629 Macro arguments: (#:whole-470 #:environment-471)
630 On Sat, May 26, 2001 09:45:57 AM CDT it was compiled from:
631 /usr/stuff/sbcl/src/code/host-alieneval.lisp
632 Created: Monday, March 12, 2001 07:47:43 AM CST
635 (TIME (ROOM T)) reports more than 200 Mbytes consed even for
636 a clean, just-started SBCL system. And it seems to be right:
637 (ROOM T) can bring a small computer to its knees for a *long*
638 time trying to GC afterwards. Surely there's some more economical
639 way to implement (ROOM T).
642 reported by Martin Atzmueller 2001-06-25; originally from CMU CL bugs
644 ;;; This file fails to compile.
645 ;;; Maybe this bug is related to bugs #65, #70 in the BUGS file.
646 (in-package :cl-user)
652 ;; Uncomment and it works
655 In SBCL 0.6.12.42, the problem is
656 internal error, failed AVER:
657 "(COMMON-LISP:EQ (SB!C::LAMBDA-TAIL-SET SB!C::CALLER)
658 (SB!C::LAMBDA-TAIL-SET (SB!C::LAMBDA-HOME SB!C::CALLEE)))"
661 reported by Martin Atzmueller 2001-06-25; originally from CMU CL bugs
663 ;;; The compiler is flushing the argument type test, and the default
664 ;;; case in the cond, so that calling with say a fixnum 0 causes a
666 (declaim (optimize (safety 2) (speed 3)))
668 (declare (type (or string stream) x))
669 (cond ((typep x 'string) 'string)
670 ((typep x 'stream) 'stream)
673 The symptom in sbcl-0.6.12.42 on OpenBSD is actually (TST 0)=>STREAM
674 (not the SIGBUS reported in the comment) but that's broken too;
675 type declarations are supposed to be treated as assertions unless
676 SAFETY 0, so we should be getting a TYPE-ERROR.
679 reported by Martin Atzmueller 2001-06-25; originally from CMU CL bugs
681 (in-package :cl-user)
682 ;;; From: David Gadbois <gadbois@cyc.com>
684 ;;; Logical pathnames aren't externalizable.
686 (let ((tempfile "/tmp/test.lisp"))
687 (setf (logical-pathname-translations "XXX")
688 '(("XXX:**;*.*" "/tmp/**/*.*")))
689 (with-open-file (out tempfile :direction :output)
690 (write-string "(defvar *path* #P\"XXX:XXX;FOO.LISP\")" out))
691 (compile-file tempfile))
692 The error message in sbcl-0.6.12.42 is
694 ; (while making load form for #<SB-IMPL::LOGICAL-HOST "XXX">)
695 ; A logical host can't be dumped as a constant: #<SB-IMPL::LOGICAL-HOST "XXX">
698 reported by Martin Atzmueller 2001-06-25; originally from CMU CL bugs
700 (in-package :cl-user)
701 ;;; The following invokes a compiler error.
702 (declaim (optimize (speed 2) (debug 3)))
705 (unwind-protect nil)))
709 The error message in sbcl-0.6.12.42 is
710 internal error, failed AVER:
711 "(COMMON-LISP:EQ (SB!C::TN-ENVIRONMENT SB!C:TN) SB!C::TN-ENV)"
714 When the compiler inline expands functions, it may be that different
715 kinds of return values are generated from different code branches.
716 E.g. an inline expansion of POSITION generates integer results
717 from one branch, and NIL results from another. When that inline
718 expansion is used in a context where only one of those results
721 (aref *a1* (position x *a2*)))
722 and the compiler can't prove that the unacceptable branch is
723 never taken, then bogus type mismatch warnings can be generated.
724 If you need to suppress the type mismatch warnings, you can
725 suppress the inline expansion,
727 #+sbcl (declare (notinline position)) ; to suppress bug 117 bogowarnings
728 (aref *a1* (position x *a2*)))
729 or, sometimes, suppress them by declaring the result to be of an
732 (aref *a1* (the integer (position x *a2*))))
734 This is not a new compiler problem in 0.7.0, but the new compiler
735 transforms for FIND, POSITION, FIND-IF, and POSITION-IF make it
736 more conspicuous. If you don't need performance from these functions,
737 and the bogus warnings are a nuisance for you, you can return to
738 your pre-0.7.0 state of grace with
739 #+sbcl (declaim (notinline find position find-if position-if)) ; bug 117..
742 as reported by Eric Marsden on cmucl-imp@cons.org 2001-08-14:
743 (= (FLOAT 1 DOUBLE-FLOAT-EPSILON)
744 (+ (FLOAT 1 DOUBLE-FLOAT-EPSILON) DOUBLE-FLOAT-EPSILON)) => T
745 when of course it should be NIL. (He says it only fails for X86,
746 not SPARC; dunno about Alpha.)
748 Also, "the same problem exists for LONG-FLOAT-EPSILON,
749 DOUBLE-FLOAT-NEGATIVE-EPSILON, LONG-FLOAT-NEGATIVE-EPSILON (though
750 for the -negative- the + is replaced by a - in the test)."
752 Raymond Toy comments that this is tricky on the X86 since its FPU
753 uses 80-bit precision internally.
756 The compiler incorrectly figures the return type of
757 (DEFUN FOO (FRAME UP-FRAME)
764 This problem exists in CMU CL 18c too. When I reported it on
765 cmucl-imp@cons.org, Raymond Toy replied 23 Aug 2001 with
766 a partial explanation, but no fix has been found yet.
769 Even in sbcl-0.pre7.x, which is supposed to be free of the old
770 non-ANSI behavior of treating the function return type inferred
771 from the current function definition as a declaration of the
772 return type from any function of that name, the return type of NIL
773 is attached to FOO in 120a above, and used to optimize code which
777 There was some sort of screwup in handling of
778 (IF (NOT (IGNORE-ERRORS ..))). E.g.
780 (if (not (ignore-errors
781 (make-pathname :host "foo" :directory "!bla" :name "bar")))
783 (error "notunlessnot")))
784 The (NOT (IGNORE-ERRORS ..)) form evaluates to T, so this should be
785 printing "ok", but instead it's going to the ERROR. This problem
786 seems to've been introduced by MNA's HANDLER-CASE patch (sbcl-devel
787 2001-07-17) and as a workaround (put in sbcl-0.pre7.14.flaky4.12)
788 I reverted back to the old weird HANDLER-CASE code. However, I
789 think the problem looks like a compiler bug in handling RETURN-FROM,
790 so I left the MNA-patched code in HANDLER-CASE (suppressed with
791 #+NIL) and I'd like to go back to see whether this really is
792 a compiler bug before I delete this BUGS entry.
795 The *USE-IMPLEMENTATION-TYPES* hack causes bugs, particularly
796 (IN-PACKAGE :SB-KERNEL)
797 (TYPE= (SPECIFIER-TYPE '(VECTOR T))
798 (SPECIFIER-TYPE '(VECTOR UNDEFTYPE)))
799 Then because of this, the compiler bogusly optimizes
800 (TYPEP #(11) '(SIMPLE-ARRAY UNDEF-TYPE 1))
801 to T. Unfortunately, just setting *USE-IMPLEMENTATION-TYPES* to
802 NIL around sbcl-0.pre7.14.flaky4.12 didn't work: the compiler complained
803 about type mismatches (probably harmlessly, another instance of bug 117);
804 and then cold init died with a segmentation fault.
807 As of version 0.pre7.14, SBCL's implementation of MACROLET makes
808 the entire lexical environment at the point of MACROLET available
809 in the bodies of the macroexpander functions. In particular, it
810 allows the function bodies (which run at compile time) to try to
811 access lexical variables (which are only defined at runtime).
812 It doesn't even issue a warning, which is bad.
814 The SBCL behavior arguably conforms to the ANSI spec (since the
815 spec says that the behavior is undefined, ergo anything conforms).
816 However, it would be better to issue a compile-time error.
817 Unfortunately I (WHN) don't see any simple way to detect this
818 condition in order to issue such an error, so for the meantime
819 SBCL just does this weird broken "conforming" thing.
821 The ANSI standard says, in the definition of the special operator
823 The macro-expansion functions defined by MACROLET are defined
824 in the lexical environment in which the MACROLET form appears.
825 Declarations and MACROLET and SYMBOL-MACROLET definitions affect
826 the local macro definitions in a MACROLET, but the consequences
827 are undefined if the local macro definitions reference any
828 local variable or function bindings that are visible in that
830 Then it seems to contradict itself by giving the example
832 (macrolet ((fudge (z)
833 ;The parameters x and flag are not accessible
834 ; at this point; a reference to flag would be to
835 ; the global variable of that name.
836 ` (if flag (* ,z ,z) ,z)))
837 ;The parameters x and flag are accessible here.
841 The comment "a reference to flag would be to the global variable
842 of the same name" sounds like good behavior for the system to have.
843 but actual specification quoted above says that the actual behavior
847 (as reported by Gabe Garza on cmucl-help 2001-09-21)
849 (defun test-pred (x y)
853 (func (lambda () x)))
854 (print (eq func func))
855 (print (test-pred func func))
856 (delete func (list func))))
857 Now calling (TEST-CASE) gives output
860 (#<FUNCTION {500A9EF9}>)
861 Evidently Python thinks of the lambda as a code transformation so
862 much that it forgets that it's also an object.
865 The DEFSTRUCT section of the ANSI spec, in the :CONC-NAME section,
866 specifies a precedence rule for name collisions between slot accessors of
867 structure classes related by inheritance. As of 0.7.0, SBCL still
871 insufficient syntax checking in MACROLET:
873 (macrolet ((defmacro bar (z) `(+ z z)))
875 shouldn't compile without error (because of the extra DEFMACRO symbol).
878 As of sbcl-0.pre7.86.flaky7.3, the cross-compiler, and probably
879 the CL:COMPILE function (which is based on the same %COMPILE
880 mechanism) get confused by
882 (labels ((sxhash-number (x)
884 (fixnum (sxhash x)) ; through DEFTRANSFORM
885 (integer (sb!bignum:sxhash-bignum x))
886 (single-float (sxhash x)) ; through DEFTRANSFORM
887 (double-float (sxhash x)) ; through DEFTRANSFORM
888 #!+long-float (long-float (error "stub: no LONG-FLOAT"))
889 (ratio (let ((result 127810327))
890 (declare (type fixnum result))
891 (mixf result (sxhash-number (numerator x)))
892 (mixf result (sxhash-number (denominator x)))
894 (complex (let ((result 535698211))
895 (declare (type fixnum result))
896 (mixf result (sxhash-number (realpart x)))
897 (mixf result (sxhash-number (imagpart x)))
899 (sxhash-recurse (x &optional (depthoid +max-hash-depthoid+))
900 (declare (type index depthoid))
904 (mix (sxhash-recurse (car x) (1- depthoid))
905 (sxhash-recurse (cdr x) (1- depthoid)))
908 (if (typep x 'structure-object)
910 (sxhash ; through DEFTRANSFORM
911 (class-name (layout-class (%instance-layout x)))))
913 (symbol (sxhash x)) ; through DEFTRANSFORM
914 (number (sxhash-number x))
917 (simple-string (sxhash x)) ; through DEFTRANSFORM
918 (string (%sxhash-substring x))
919 (bit-vector (let ((result 410823708))
920 (declare (type fixnum result))
921 (dotimes (i (min depthoid (length x)))
922 (mixf result (aref x i)))
924 (t (logxor 191020317 (sxhash (array-rank x))))))
927 (sxhash (char-code x)))) ; through DEFTRANSFORM
930 complaining "function called with two arguments, but wants exactly
931 one" about SXHASH-RECURSE. (This might not be strictly a new bug,
932 since IIRC post-fork CMU CL has also had problems with &OPTIONAL
933 arguments in FLET/LABELS: it might be an old Python bug which is
934 only exercised by the new arrangement of the SBCL compiler.)
937 Ideally, uninterning a symbol would allow it, and its associated
938 FDEFINITION and PROCLAIM data, to be reclaimed by the GC. However,
939 at least as of sbcl-0.7.0, this isn't the case. Information about
940 FDEFINITIONs and PROCLAIMed properties is stored in globaldb.lisp
941 essentially in ordinary (non-weak) hash tables keyed by symbols.
942 Thus, once a system has an entry in this system, it tends to live
943 forever, even when it is uninterned and all other references to it
947 (reported by Arnaud Rouanet on cmucl-imp 2001-12-18)
948 (defmethod foo ((x integer))
950 (defmethod foo :around ((x integer))
953 Now (FOO 3) should return 3, but instead it returns 4.
956 (reported by Alexey Dejneka sbcl-devel 2002-01-03)
958 SUBTYPEP does not work well with redefined classes:
967 * (defclass b (a) ())
980 This bug was fixed in sbcl-0.7.4.1 by invalidating the PCL wrapper
981 class upon redefinition. Unfortunately, doing so causes bug #176 to
982 appear. Pending further investication, one or other of these bugs
983 might be present at any given time.
986 Pretty-printing nested backquotes doesn't work right, as
987 reported by Alexey Dejneka sbcl-devel 2002-01-13:
989 ``(FOO SB-IMPL::BACKQ-COMMA-AT S)
990 * (lisp-implementation-version)
994 (as reported by Lynn Quam on cmucl-imp ca. 2002-01-16)
995 %NATURALIZE-C-STRING conses a lot, like 16 bytes per byte
996 of the naturalized string. We could probably port the patches
997 from the cmucl-imp mailing list.
1000 (reported by Jesse Bouwman 2001-10-24 through the unfortunately
1001 prominent SourceForge web/db bug tracking system, which is
1002 unfortunately not a reliable way to get a timely response from
1003 the SBCL maintainers)
1004 In the course of trying to build a test case for an
1005 application error, I encountered this behavior:
1006 If you start up sbcl, and then lay on CTRL-C for a
1007 minute or two, the lisp process will eventually say:
1008 %PRIMITIVE HALT called; the party is over.
1009 and throw you into the monitor. If I start up lisp,
1010 attach to the process with strace, and then do the same
1011 (abusive) thing, I get instead:
1012 access failure in heap page not marked as write-protected
1013 and the monitor again. I don't know enough to have the
1014 faintest idea of what is going on here.
1015 This is with sbcl 6.12, uname -a reports:
1016 Linux prep 2.2.19 #4 SMP Tue Apr 24 13:59:52 CDT 2001 i686 unknown
1017 I (WHN) have verified that the same thing occurs on sbcl-0.pre7.141
1018 under OpenBSD 2.9 on my X86 laptop. Do be patient when you try it:
1019 it took more than two minutes (but less than five) for me.
1022 (This was once known as IR1-4, but it lived on even after the
1023 IR1 interpreter went to the big bit bucket in the sky.)
1024 The system accepts DECLAIM in most places where DECLARE would be
1025 accepted, without even issuing a warning. ANSI allows this, but since
1026 it's fairly easy to mistype DECLAIM instead of DECLARE, and the
1027 meaning is rather different, and it's unlikely that the user
1028 has a good reason for doing DECLAIM not at top level, it would be
1029 good to issue a STYLE-WARNING when this happens. A possible
1030 fix would be to issue STYLE-WARNINGs for DECLAIMs not at top level,
1031 or perhaps to issue STYLE-WARNINGs for any EVAL-WHEN not at top level.
1032 [This is considered an IR1-interpreter-related bug because until
1033 EVAL-WHEN is rewritten, which won't happen until after the IR1
1034 interpreter is gone, the system's notion of what's a top-level form
1035 and what's not will remain too confused to fix this problem.]
1038 ANSI allows types `(COMPLEX ,FOO) to use very hairy values for
1039 FOO, e.g. (COMPLEX (AND REAL (SATISFIES ODDP))). The old CMU CL
1040 COMPLEX implementation didn't deal with this, and hasn't been
1041 upgraded to do so. (This doesn't seem to be a high priority
1042 conformance problem, since seems hard to construct useful code
1046 Floating point errors are reported poorly. E.g. on x86 OpenBSD
1049 debugger invoked on condition of type SB-KERNEL:FLOATING-POINT-EXCEPTION:
1050 An arithmetic error SB-KERNEL:FLOATING-POINT-EXCEPTION was signalled.
1051 No traps are enabled? How can this be?
1052 It should be possible to be much more specific (overflow, division
1053 by zero, etc.) and of course the "How can this be?" should be fixable.
1055 See also bugs #45.c and #183
1058 In sbcl-0.7.1.3 on x86, COMPILE-FILE on the file
1059 (in-package :cl-user)
1062 (defstruct foo bar bletch)
1064 (labels ((kidify1 (kid)
1069 (m+ (frobnicate kid)
1072 (declare (inline kid-frob))
1075 (the simple-vector (foo-bar perd)))))
1077 debugger invoked on condition of type TYPE-ERROR:
1078 The value NIL is not of type SB-C::NODE.
1079 The location of this failure has moved around as various related
1080 issues were cleaned up. As of sbcl-0.7.1.9, it occurs in
1081 NODE-BLOCK called by LAMBDA-COMPONENT called by IR2-CONVERT-CLOSURE.
1084 (essentially the same problem as a CMU CL bug reported by Martin
1085 Cracauer on cmucl-imp 2002-02-19)
1086 There is a hole in structure slot type checking. Compiling and LOADing
1087 (declaim (optimize safety))
1089 (bla 0 :type fixnum))
1091 (let ((foo (make-foo)))
1092 (setf (foo-bla foo) '(1 . 1))
1093 (format t "Is ~a of type ~a a cons? => ~a~%"
1095 (type-of (foo-bla foo))
1096 (consp (foo-bla foo)))))
1098 should signal an error, but in sbcl-0.7.1.21 instead gives the output
1099 Is (1 . 1) of type CONS a cons? => NIL
1100 without signalling an error.
1103 Functions SUBTYPEP, TYPEP, UPGRADED-ARRAY-ELEMENT-TYPE, and
1104 UPGRADED-COMPLEX-PART-TYPE should have an optional environment argument.
1105 (reported by Alexey Dejneka sbcl-devel 2002-04-12)
1108 (reported by Robert E. Brown 2002-04-16)
1109 When a function is called with too few arguments, causing the
1110 debugger to be entered, the uninitialized slots in the bad call frame
1111 seem to cause GCish problems, being interpreted as tagged data even
1112 though they're not. In particular, executing ROOM in the
1113 debugger at that point causes AVER failures:
1116 * (lisp-implementation-version)
1122 failed AVER: "(SAP= CURRENT END)"
1123 (Christophe Rhodes reports that this doesn't occur on the SPARC, which
1124 isn't too surprising since there are many differences in stack
1125 implementation and GC conservatism between the X86 and other ports.)
1128 Array types with element-types of some unknown type are falsely being
1129 assumed to be of type (ARRAY T) by the compiler in some cases. The
1130 following code demonstrates the problem:
1133 (declare (type (vector bar) x))
1135 (deftype bar () 'single-float)
1136 (foo (make-array 3 :element-type 'bar))
1137 -> TYPE-ERROR "The value #(0.0 0.0 0.0) is not of type (VECTOR BAR)."
1138 (typep (make-array 3 :element-type 'bar) '(vector bar))
1141 The easy solution is to make the functions which depend on knowing
1142 the upgraded-array-element-type (in compiler/array-tran and
1143 compiler/generic/vm-tran as of sbcl-0.7.3.x) be slightly smarter about
1144 unknown types; an alternative is to have the
1145 specialized-element-type slot in the ARRAY-TYPE structure be
1146 *WILD-TYPE* for UNKNOWN-TYPE element types.
1150 (in-package :cl-user)
1152 (defmethod permanentize ((uustk uustk))
1153 (flet ((frob (hash-table test-for-deletion)
1155 (obj-entry.stale? (oe)
1156 (destructuring-bind (key . datum) oe
1157 (declare (type simple-vector key))
1158 (deny0 (void? datum))
1159 (some #'stale? key))))
1160 (declare (inline frob obj-entry.stale?))
1161 (frob (uustk.args-hash->obj-alist uustk)
1163 (frob (uustk.hash->memoized-objs-list uustk)
1166 in sbcl-0.7.3.11 causes an assertion failure,
1169 (AND (NULL (BLOCK-SUCC B))
1170 (NOT (BLOCK-DELETE-P B))
1171 (NOT (EQ B (COMPONENT-HEAD #)))))"
1174 In sbcl-0.7.3.11, compiling the (illegal) code
1175 (in-package :cl-user)
1176 (defmethod prove ((uustk uustk))
1177 (zap ((frob () nil))
1179 gives the (not terribly clear) error message
1181 ; (during macroexpansion of (DEFMETHOD PROVE ...))
1182 ; can't get template for (FROB NIL NIL)
1183 The problem seems to be that the code walker used by the DEFMETHOD
1184 macro is unhappy with the illegal syntax in the method body, and
1185 is giving an unclear error message.
1188 (reported by Dan Barlow on sbcl-devel 2002-05-10)
1189 In sbcl-0.7.3.12, doing
1190 (defstruct foo bar baz)
1191 (compile nil (lambda (x) (or x (foo-baz x))))
1193 debugger invoked on condition of type SB-INT:BUG:
1194 full call to SB-KERNEL:%INSTANCE-REF
1195 This is probably a bug in SBCL itself. [...]
1196 Since this is a reasonable user error, it shouldn't be reported as
1200 (reported by Pierre Mai while investigating bug 47):
1201 (DEFCLASS FOO () ((A :SILLY T)))
1202 signals a SIMPLE-ERROR, not a PROGRAM-ERROR.
1205 sbcl's treatment of at least macro lambda lists is too permissive;
1206 e.g., in sbcl-0.7.3.7:
1207 (defmacro foo (&rest rest bar) `(,bar ,rest))
1208 (macroexpand '(foo quux zot)) -> (QUUX (QUUX ZOT))
1209 whereas section 3.4.4 of the CLHS doesn't allow required parameters
1210 to come after the rest argument.
1213 The compiler sometimes tries to constant-fold expressions before
1214 it checks to see whether they can be reached. This can lead to
1215 bogus warnings about errors in the constant folding, e.g. in code
1218 (WRITE-STRING (> X 0) "+" "0"))
1219 compiled in a context where the compiler can prove that X is NIL,
1220 and the compiler complains that (> X 0) causes a type error because
1221 NIL isn't a valid argument to #'>. Until sbcl-0.7.4.10 or so this
1222 caused a full WARNING, which made the bug really annoying because then
1223 COMPILE and COMPILE-FILE returned FAILURE-P=T for perfectly legal
1224 code. Since then the warning has been downgraded to STYLE-WARNING,
1225 so it's still a bug but at least it's a little less annoying.
1228 The error message from attempting to use a #\Return format
1230 (format nil "~^M") ; replace "^M" with a literal #\Return
1231 debugger invoked on condition of type SB-FORMAT::FORMAT-ERROR:
1232 error in format: unknown format directive
1235 is not terribly helpful; this is more noticeable than parallel cases
1236 with e.g. #\Backspace because of the differing newline conventions
1237 on various operating systems. (reported by Harald Hanche-Olsen on
1238 cmucl-help 2002-05-31)
1241 reported by Alexey Dejneka 08 Jun 2002 in sbcl-devel:
1242 Playing with McCLIM, I've received an error "Unbound variable WRAPPER
1243 in SB-PCL::CHECK-WRAPPER-VALIDITY".
1244 (defun check-wrapper-validity (instance)
1245 (let* ((owrapper (wrapper-of instance)))
1246 (if (not (invalid-wrapper-p owrapper))
1248 (let* ((state (wrapper-state wrapper)) ; !!!
1250 I've tried to replace it with OWRAPPER, but now OBSOLETE-INSTANCE-TRAP
1251 breaks with "NIL is not of type SB-KERNEL:LAYOUT".
1253 partial fix: The undefined variable WRAPPER resulted from an error
1254 in recent refactoring, as can be seen by comparing to the code in e.g.
1255 sbcl-0.7.2. Replacing WRAPPER with OWRAPPER (done by WHN in sbcl-0.7.4.22)
1256 should bring the code back to its behavior as of sbcl-0.7.2, but
1257 that still leaves the OBSOLETE-INSTANCE-TRAP bug. An example of
1258 input which triggers that bug is
1260 (let ((lastname (intern (format nil "C~D" (1- i))))
1261 (name (intern (format nil "C~D" i))))
1262 (eval `(defclass ,name
1263 (,@(if (= i 0) nil (list lastname)))
1265 (eval `(defmethod initialize-instance :after ((x ,name) &rest any)
1266 (declare (ignore any))))))
1268 (defclass c0 (b) ())
1269 (make-instance 'c19)
1273 178: "AVER failure compiling confused THEs in FUNCALL"
1274 In sbcl-0.7.4.24, compiling
1276 (funcall (the function (the standard-object x))))
1279 "(AND (EQ (IR2-CONTINUATION-PRIMITIVE-TYPE 2CONT) FUNCTION-PTYPE) (EQ CHECK T))"
1280 This variant compiles OK, though:
1281 (defun bug178alternative (x)
1282 (funcall (the nil x)))
1284 181: "bad type specifier drops compiler into debugger"
1286 (in-package :cl-user)
1288 (declare (type 0 x))
1291 bad thing to be a type specifier: 0
1292 which seems fine, but also enters the debugger (instead of having
1293 the compiler handle the error, convert it into a COMPILER-ERROR, and
1294 continue compiling) which seems wrong.
1296 183: "IEEE floating point issues"
1297 Even where floating point handling is being dealt with relatively
1298 well (as of sbcl-0.7.5, on sparc/sunos and alpha; see bug #146), the
1299 accrued-exceptions and current-exceptions part of the fp control
1300 word don't seem to bear much relation to reality. E.g. on
1304 debugger invoked on condition of type DIVISION-BY-ZERO:
1305 arithmetic error DIVISION-BY-ZERO signalled
1306 0] (sb-vm::get-floating-point-modes)
1308 (:TRAPS (:OVERFLOW :INVALID :DIVIDE-BY-ZERO)
1309 :ROUNDING-MODE :NEAREST
1310 :CURRENT-EXCEPTIONS NIL
1311 :ACCRUED-EXCEPTIONS (:INEXACT)
1314 * (sb-vm::get-floating-point-modes)
1315 (:TRAPS (:OVERFLOW :INVALID :DIVIDE-BY-ZERO)
1316 :ROUNDING-MODE :NEAREST
1317 :CURRENT-EXCEPTIONS (:INEXACT)
1318 :ACCRUED-EXCEPTIONS (:INEXACT)
1321 185: "top-level forms at the REPL"
1322 * (locally (defstruct foo (a 0 :type fixnum)))
1325 ; (in macroexpansion of (SB-KERNEL::%DELAYED-GET-COMPILER-LAYOUT BAR))
1326 however, compiling and loading the same expression in a file works
1329 187: "type inference confusion around DEFTRANSFORM time"
1330 (reported even more verbosely on sbcl-devel 2002-06-28 as "strange
1331 bug in DEFTRANSFORM")
1332 After the file below is compiled and loaded in sbcl-0.7.5, executing
1333 (TCX (MAKE-ARRAY 4 :FILL-POINTER 2) 0)
1334 at the REPL returns an adjustable vector, which is wrong. Presumably
1335 somehow the DERIVE-TYPE information for the output values of %WAD is
1336 being mispropagated as a type constraint on the input values of %WAD,
1337 and so causing the type test to be optimized away. It's unclear how
1338 hand-expanding the DEFTRANSFORM would change this, but it suggests
1339 the DEFTRANSFORM machinery (or at least the way DEFTRANSFORMs are
1340 invoked at a particular phase) is involved.
1341 (cl:in-package :sb-c)
1342 (eval-when (:compile-toplevel)
1343 ;;; standin for %DATA-VECTOR-AND-INDEX
1344 (defknown %dvai (array index)
1346 (foldable flushable))
1347 (deftransform %dvai ((array index)
1351 (let* ((atype (continuation-type array))
1352 (eltype (array-type-specialized-element-type atype)))
1353 (when (eq eltype *wild-type*)
1354 (give-up-ir1-transform
1355 "specialized array element type not known at compile-time"))
1356 (when (not (array-type-complexp atype))
1357 (give-up-ir1-transform "SIMPLE array!"))
1358 `(if (array-header-p array)
1359 (%wad array index nil)
1360 (values array index))))
1361 ;;; standin for %WITH-ARRAY-DATA
1362 (defknown %wad (array index (or index null))
1363 (values (simple-array * (*)) index index index)
1364 (foldable flushable))
1365 ;;; (Commenting out this optimizer causes the bug to go away.)
1366 (defoptimizer (%wad derive-type) ((array start end))
1367 (let ((atype (continuation-type array)))
1368 (when (array-type-p atype)
1369 (values-specifier-type
1370 `(values (simple-array ,(type-specifier
1371 (array-type-specialized-element-type atype))
1373 index index index)))))
1375 (defun %wad (array start end)
1376 (format t "~&in %WAD~%")
1377 (%with-array-data array start end))
1378 (cl:in-package :cl-user)
1380 (declare (type (vector t) v))
1381 (declare (notinline sb-kernel::%with-array-data))
1382 ;; (Hand-expending DEFTRANSFORM %DVAI here also causes the bug to
1386 188: "compiler performance fiasco involving type inference and UNION-TYPE"
1387 (In sbcl-0.7.6.10, DEFTRANSFORM CONCATENATE was commented out until this
1388 bug could be fixed properly, so you won't see the bug unless you restore
1389 the DEFTRANSFORM by hand.) In sbcl-0.7.5.11 on a 700 MHz Pentium III,
1393 (declare (optimize (safety 3)))
1394 (declare (optimize (compilation-speed 2)))
1395 (declare (optimize (speed 1) (debug 1) (space 1)))
1396 (let ((fn "if-this-file-exists-the-universe-is-strange"))
1397 (load fn :if-does-not-exist nil)
1398 (load (concatenate 'string fn ".lisp") :if-does-not-exist nil)
1399 (load (concatenate 'string fn ".fasl") :if-does-not-exist nil)
1400 (load (concatenate 'string fn ".misc-garbage")
1401 :if-does-not-exist nil)))))
1403 134.552 seconds of real time
1404 133.35156 seconds of user run time
1405 0.03125 seconds of system run time
1406 [Run times include 2.787 seconds GC run time.]
1408 246883368 bytes consed.
1409 BACKTRACE from Ctrl-C in the compilation shows that the compiler is
1410 thinking about type relationships involving types like
1412 (OR (INTEGER 576 576)
1423 190: "PPC/Linux pipe? buffer? bug"
1424 In sbcl-0.7.6, the run-program.test.sh test script sometimes hangs
1425 on the PPC/Linux platform, waiting for a zombie env process. This
1426 is a classic symptom of buffer filling and deadlock, but it seems
1427 only sporadically reproducible.
1429 191: "Miscellaneous PCL deficiencies"
1430 (reported by Alexey Dejenka sbcl-devel 2002-08-04)
1431 a. DEFCLASS does not inform the compiler about generated
1432 functions. Compiling a file with
1433 (DEFCLASS A-CLASS ()
1435 (DEFUN A-CLASS-X (A)
1436 (WITH-SLOTS (A-CLASS-X) A
1438 results in a STYLE-WARNING:
1440 SB-SLOT-ACCESSOR-NAME::|COMMON-LISP-USER A-CLASS-X slot READER|
1441 c. the examples in CLHS 7.6.5.1 (regarding generic function lambda
1442 lists and &KEY arguments) do not signal errors when they should.
1444 DEFUNCT CATEGORIES OF BUGS
1446 These labels were used for bugs related to the old IR1 interpreter.
1447 The # values reached 6 before the category was closed down.