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. ANSI justifies this specification by saying
54 The restriction against issuing a warning for type mismatches
55 between a slot-initform and the corresponding slot's :TYPE
56 option is necessary because a slot-initform must be specified
57 in order to specify slot options; in some cases, no suitable
59 In SBCL, as in CMU CL (or, for that matter, any compiler which
60 really understands Common Lisp types) a suitable default does
61 exist, in all cases, because the compiler understands the concept
62 of functions which never return (i.e. has return type NIL, e.g.
63 ERROR). Thus, as a portable workaround, you can use a call to
64 some known-never-to-return function as the default. E.g.
66 (BAR (ERROR "missing :BAR argument")
67 :TYPE SOME-TYPE-TOO-HAIRY-TO-CONSTRUCT-AN-INSTANCE-OF))
69 (DECLAIM (FTYPE () NIL) MISSING-ARG)
70 (DEFUN REQUIRED-ARG () ; workaround for SBCL non-ANSI slot init typing
71 (ERROR "missing required argument"))
73 (BAR (REQUIRED-ARG) :TYPE TRICKY-TYPE-OF-SOME-SORT)
74 (BLETCH (REQUIRED-ARG) :TYPE TRICKY-TYPE-OF-SOME-SORT)
75 (N-REFS-SO-FAR 0 :TYPE (INTEGER 0)))
76 Such code will compile without complaint and work correctly either
77 on SBCL or on a completely compliant Common Lisp system.
80 bogus warnings about undefined functions for magic functions like
81 SB!C::%%DEFUN and SB!C::%DEFCONSTANT when cross-compiling files
82 like src/code/float.lisp. Fixing this will probably require
83 straightening out enough bootstrap consistency issues that
84 the cross-compiler can run with *TYPE-SYSTEM-INITIALIZED*.
85 Instead, the cross-compiler runs in a slightly flaky state
86 which is sane enough to compile SBCL itself, but which is
87 also unstable in several ways, including its inability
88 to really grok function declarations.
91 The "byte compiling top-level form:" output ought to be condensed.
92 Perhaps any number of such consecutive lines ought to turn into a
93 single "byte compiling top-level forms:" line.
96 The way that the compiler munges types with arguments together
97 with types with no arguments (in e.g. TYPE-EXPAND) leads to
98 weirdness visible to the user:
99 (DEFTYPE FOO () 'FIXNUM)
101 (TYPEP 11 '(FOO)) => T, which seems weird
102 (TYPEP 11 'FIXNUM) => T
103 (TYPEP 11 '(FIXNUM)) signals an error, as it should
104 The situation is complicated by the presence of Common Lisp types
105 like UNSIGNED-BYTE (which can either be used in list form or alone)
106 so I'm not 100% sure that the behavior above is actually illegal.
107 But I'm 90+% sure, and the following related behavior,
109 treating the bare symbol AND as equivalent to '(AND), is specifically
110 forbidden (by the ANSI specification of the AND type).
113 It would be nice if the
115 (during macroexpansion)
116 said what macroexpansion was at fault, e.g.
118 (during macroexpansion of IN-PACKAGE,
119 during macroexpansion of DEFFOO)
122 The ANSI syntax for non-STANDARD method combination types in CLOS is
123 (DEFGENERIC FOO (X) (:METHOD-COMBINATION PROGN))
124 (DEFMETHOD FOO PROGN ((X BAR)) (PRINT 'NUMBER))
125 If you mess this up, omitting the PROGN qualifier in in DEFMETHOD,
126 (DEFGENERIC FOO (X) (:METHOD-COMBINATION PROGN))
127 (DEFMETHOD FOO ((X BAR)) (PRINT 'NUMBER))
128 the error mesage is not easy to understand:
129 INVALID-METHOD-ERROR was called outside the dynamic scope
130 of a method combination function (inside the body of
131 DEFINE-METHOD-COMBINATION or a method on the generic
132 function COMPUTE-EFFECTIVE-METHOD).
133 It would be better if it were more informative, a la
134 The method combination type for this method (STANDARD) does
135 not match the method combination type for the generic function
137 Also, after you make the mistake of omitting the PROGN qualifier
138 on a DEFMETHOD, doing a new DEFMETHOD with the correct qualifier
140 (DEFMETHOD FOO PROGN ((X BAR)) (PRINT 'NUMBER))
142 INVALID-METHOD-ERROR was called outside the dynamic scope
143 of a method combination function (inside the body of
144 DEFINE-METHOD-COMBINATION or a method on the generic
145 function COMPUTE-EFFECTIVE-METHOD).
146 This is not very helpful..
149 (SUBTYPEP '(FUNCTION (T BOOLEAN) NIL)
150 '(FUNCTION (FIXNUM FIXNUM) NIL)) => T, T
151 (Also, when this is fixed, we can enable the code in PROCLAIM which
152 checks for incompatible FTYPE redeclarations.)
155 from DTC on the CMU CL mailing list 25 Feb 2000:
156 ;;; Compiler fails when this file is compiled.
158 ;;; Problem shows up in delete-block within ir1util.lisp. The assertion
159 ;;; (assert (member (functional-kind lambda) '(:let :mv-let :assignment)))
160 ;;; fails within bind node branch.
162 ;;; Note that if c::*check-consistency* is enabled then an un-reached
163 ;;; entry is also reported.
166 (declare (values nil))
183 (let ((ttt #'(lambda () (go cccc))))
184 (declare (special ttt))
185 (return-from bbbb nil))
188 (return-from bbbb nil))))))
191 (I *think* this is a bug. It certainly seems like strange behavior. But
192 the ANSI spec is scary, dark, and deep..)
193 (FORMAT NIL "~,1G" 1.4) => "1. "
194 (FORMAT NIL "~3,1G" 1.4) => "1. "
197 from Marco Antoniotti on cmucl-imp mailing list 1 Mar 2000:
199 (setf (find-class 'ccc1) (find-class 'ccc))
200 (defmethod zut ((c ccc1)) 123)
201 DTC's recommended workaround from the mailing list 3 Mar 2000:
202 (setf (pcl::find-class 'ccc1) (pcl::find-class 'ccc))
205 The ANSI spec, in section "22.3.5.2 Tilde Less-Than-Sign: Logical Block",
206 says that an error is signalled if ~W, ~_, ~<...~:>, ~I, or ~:T is used
207 inside "~<..~>" (without the colon modifier on the closing syntax).
208 However, SBCL doesn't do this:
209 * (FORMAT T "~<munge~wegnum~>" 12)
214 When too many files are opened, OPEN will fail with an
215 uninformative error message
216 error in function OPEN: error opening #P"/tmp/foo.lisp": NIL
217 instead of saying that too many files are open.
220 Right now, when COMPILE-FILE has a read error, it actually pops
221 you into the debugger before giving up on the file. It should
222 instead handle the error, perhaps issuing (and handling)
223 a secondary error "caught ERROR: unrecoverable error during compilation"
224 and then return with FAILURE-P true,
227 reported by Sam Steingold on the cmucl-imp mailing list 12 May 2000:
229 Also, there is another bug: `array-displacement' should return an array
230 or nil as first value (as per ANSI CL), while CMUCL declares it as
231 returning an array as first value always.
234 Sometimes (SB-EXT:QUIT) fails with
235 Argh! maximum interrupt nesting depth (4096) exceeded, exiting
236 Process inferior-lisp exited abnormally with code 1
237 I haven't noticed a repeatable case of this yet.
240 some sort of bug in inlining and RETURN-FROM in sbcl-0.6.5: Compiling
243 (BLOCK USED-BY-SOME-Y?
246 (UNLESS (REJECTED? Y)
247 (RETURN-FROM USED-BY-SOME-Y? T)))))
248 (DECLARE (INLINE FROB))
253 error in function SB-KERNEL:ASSERT-ERROR:
254 The assertion (EQ (SB-C::CONTINUATION-KIND SB-C::CONT) :BLOCK-START) failed.
255 This is still present in sbcl-0.6.8.
258 In some cases the compiler believes type declarations on array
259 elements without checking them, e.g.
260 (DECLAIM (OPTIMIZE (SAFETY 3) (SPEED 1) (SPACE 1)))
263 (DECLARE (TYPE (SIMPLE-ARRAY CONS 1) X))
264 (WHEN (CONSP (AREF X 0))
266 (BAR (VECTOR (MAKE-FOO :A 11 :B 12)))
269 in SBCL 0.6.5 (and also in CMU CL 18b). This does not happen for
270 all cases, e.g. the type assumption *is* checked if the array
271 elements are declared to be of some structure type instead of CONS.
274 The printer doesn't report closures very well. This is true in
278 #<Closure Over Function "DEFUN STRUCTURE-SLOT-ACCESSOR" {134D1A1}>
279 It would be nice to make closures have a settable name slot,
280 and make things like DEFSTRUCT and FLET, which create closures,
281 set helpful values into this slot.
284 And as long as we're wishing, it would be awfully nice if INSPECT could
285 also report on closures, telling about the values of the bound variables.
288 The compiler assumes that any time a function of declared FTYPE
289 doesn't signal an error, its arguments were of the declared type.
290 E.g. compiling and loading
291 (DECLAIM (OPTIMIZE (SAFETY 3)))
292 (DEFUN FACTORIAL (X) (GAMMA (1+ X)))
293 (DECLAIM (FTYPE (FUNCTION (UNSIGNED-BYTE) FACTORIAL)))
295 (COND ((> (FACTORIAL X) 1.0E6)
296 (FORMAT T "too big~%"))
298 (FORMAT T "exactly ~S~%" (FACTORIAL X)))
300 (FORMAT T "approximately ~S~%" (FACTORIAL X)))))
303 will cause the INTEGERP case to be selected, giving bogus output a la
305 This violates the "declarations are assertions" principle.
306 According to the ANSI spec, in the section "System Class FUNCTION",
307 this is a case of "lying to the compiler", but the lying is done
308 by the code which calls FACTORIAL with non-UNSIGNED-BYTE arguments,
309 not by the unexpectedly general definition of FACTORIAL. In any case,
310 "declarations are assertions" means that lying to the compiler should
311 cause an error to be signalled, and should not cause a bogus
312 result to be returned. Thus, the compiler should not assume
313 that arbitrary functions check their argument types. (It might
314 make sense to add another flag (CHECKED?) to DEFKNOWN to
315 identify functions which *do* check their argument types.)
318 DEFMETHOD doesn't check the syntax of &REST argument lists properly,
319 accepting &REST even when it's not followed by an argument name:
320 (DEFMETHOD FOO ((X T) &REST) NIL)
323 TYPEP of VALUES types is sometimes implemented very inefficiently, e.g. in
324 (DEFTYPE INDEXOID () '(INTEGER 0 1000))
326 (DECLARE (TYPE INDEXOID X))
327 (THE (VALUES INDEXOID)
329 where the implementation of the type check in function FOO
330 includes a full call to %TYPEP. There are also some fundamental problems
331 with the interpretation of VALUES types (inherited from CMU CL, and
332 from the ANSI CL standard) as discussed on the cmucl-imp@cons.org
333 mailing list, e.g. in Robert Maclachlan's post of 21 Jun 2000.
336 The definitions of SIGCONTEXT-FLOAT-REGISTER and
337 %SET-SIGCONTEXT-FLOAT-REGISTER in x86-vm.lisp say they're not
338 supported on FreeBSD because the floating point state is not saved,
339 but at least as of FreeBSD 4.0, the floating point state *is* saved,
340 so they could be supported after all. Very likely
341 SIGCONTEXT-FLOATING-POINT-MODES could now be supported, too.
344 (as discussed by Douglas Crosher on the cmucl-imp mailing list ca.
345 Aug. 10, 2000): CMUCL currently interprets 'member as '(member); same
346 issue with 'union, 'and, 'or etc. So even though according to the
347 ANSI spec, bare 'MEMBER, 'AND, and 'OR are not legal types, CMUCL
348 (and now SBCL) interpret them as legal types.
351 ANSI specifies DEFINE-SYMBOL-MACRO, but it's not defined in SBCL.
352 CMU CL added it ca. Aug 13, 2000, after some discussion on the mailing
353 list, and it is probably possible to use substantially the same
354 patches to add it to SBCL.
357 a slew of floating-point-related errors reported by Peter Van Eynde
359 a: (SQRT -9.0) fails, because SB-KERNEL::COMPLEX-SQRT is undefined.
360 Similarly, COMPLEX-ASIN, COMPLEX-ACOS, COMPLEX-ACOSH, and others
362 b: SBCL's value for LEAST-POSITIVE-SHORT-FLOAT is bogus, and
363 should probably be 1.4012985e-45. In SBCL,
364 (/ LEAST-POSITIVE-SHORT-FLOAT 2) returns a number smaller
365 than LEAST-POSITIVE-SHORT-FLOAT. Similar problems
366 exist for LEAST-NEGATIVE-SHORT-FLOAT, LEAST-POSITIVE-LONG-FLOAT,
367 and LEAST-NEGATIVE-LONG-FLOAT.
368 c: Many expressions generate floating infinity:
373 PVE's regression tests want them to raise errors. SBCL
374 generates the infinities instead, which may or may not be
375 conforming behavior, but then blow it by being unable to
376 output the infinities, since support for infinities is generally
377 broken, and in particular SB-IMPL::OUTPUT-FLOAT-INFINITY is
379 d: (in section12.erg) various forms a la
380 (FLOAT 1 DOUBLE-FLOAT-EPSILON)
381 don't give the right behavior.
384 type safety errors reported by Peter Van Eynde July 25, 2000:
385 a: (COERCE (QUOTE (A B C)) (QUOTE (VECTOR * 4)))
387 In general lengths of array type specifications aren't
388 checked by COERCE, so it fails when the spec is
389 (VECTOR 4), (STRING 2), (SIMPLE-BIT-VECTOR 3), or whatever.
390 b: CONCATENATE has the same problem of not checking the length
391 of specified output array types. MAKE-SEQUENCE and MAP and
392 MERGE also have the same problem.
393 c: (COERCE 'AND 'FUNCTION) returns something related to
394 (MACRO-FUNCTION 'AND), but ANSI says it should raise an error.
395 d: ELT signals SIMPLE-ERROR if its index argument
396 isn't a valid index for its sequence argument, but should
397 signal TYPE-ERROR instead.
398 e: FILE-LENGTH is supposed to signal a type error when its
399 argument is not a stream associated with a file, but doesn't.
400 f: (FLOAT-RADIX 2/3) should signal an error instead of
402 g: (LOAD "*.lsp") should signal FILE-ERROR.
403 h: (MAKE-CONCATENATED-STREAM (MAKE-STRING-OUTPUT-STREAM))
404 should signal TYPE-ERROR.
405 i: MAKE-TWO-WAY-STREAM doesn't check that its arguments can
406 be used for input and output as needed. It should fail with
407 TYPE-ERROR when handed e.g. the results of
408 MAKE-STRING-INPUT-STREAM or MAKE-STRING-OUTPUT-STREAM in
409 the inappropriate positions, but doesn't.
410 j: (PARSE-NAMESTRING (COERCE (LIST #\f #\o #\o (CODE-CHAR 0) #\4 #\8)
412 should probably signal an error instead of making a pathname with
414 k: READ-BYTE is supposed to signal TYPE-ERROR when its argument is
415 not a binary input stream, but instead cheerfully reads from
416 character streams, e.g. (MAKE-STRING-INPUT-STREAM "abc").
419 DEFCLASS bugs reported by Peter Van Eynde July 25, 2000:
420 a: (DEFCLASS FOO () (A B A)) should signal a PROGRAM-ERROR, and
422 b: (DEFCLASS FOO () (A B A) (:DEFAULT-INITARGS X A X B)) should
423 signal a PROGRAM-ERROR, and doesn't.
424 c: (DEFCLASS FOO07 NIL ((A :ALLOCATION :CLASS :ALLOCATION :CLASS))),
425 and other DEFCLASS forms with duplicate specifications in their
426 slots, should signal a PROGRAM-ERROR, and doesn't.
427 d: (DEFGENERIC IF (X)) should signal a PROGRAM-ERROR, but instead
428 causes a COMPILER-ERROR.
431 SYMBOL-MACROLET bugs reported by Peter Van Eynde July 25, 2000:
432 a: (SYMBOL-MACROLET ((T TRUE)) ..) should probably signal
433 PROGRAM-ERROR, but SBCL accepts it instead.
434 b: SYMBOL-MACROLET should refuse to bind something which is
435 declared as a global variable, signalling PROGRAM-ERROR.
436 c: SYMBOL-MACROLET should signal PROGRAM-ERROR if something
437 it binds is declared SPECIAL inside.
440 LOOP bugs reported by Peter Van Eynde July 25, 2000:
441 a: (LOOP WITH (A B) DO (PRINT 1)) is a syntax error according to
442 the definition of WITH clauses given in the ANSI spec, but
443 compiles and runs happily in SBCL.
444 b: a messy one involving package iteration:
445 interpreted Form: (LET ((PACKAGE (MAKE-PACKAGE "LOOP-TEST"))) (INTERN "blah" PACKAGE) (LET ((BLAH2 (INTERN "blah2" PACKAGE))) (EXPORT BLAH2 PACKAGE)) (LIST (SORT (LOOP FOR SYM BEING EACH PRESENT-SYMBOL OF PACKAGE FOR SYM-NAME = (SYMBOL-NAME SYM) COLLECT SYM-NAME) (FUNCTION STRING<)) (SORT (LOOP FOR SYM BEING EACH EXTERNAL-SYMBOL OF PACKAGE FOR SYM-NAME = (SYMBOL-NAME SYM) COLLECT SYM-NAME) (FUNCTION STRING<))))
446 Should be: (("blah" "blah2") ("blah2"))
447 SBCL: (("blah") ("blah2"))
448 * (LET ((X 1)) (LOOP FOR I BY (INCF X) FROM X TO 10 COLLECT I))
449 doesn't work -- SBCL's LOOP says BY isn't allowed in a FOR clause.
452 type system errors reported by Peter Van Eynde July 25, 2000:
453 a: (SUBTYPEP 'BIGNUM 'INTEGER) => NIL, NIL
454 but should be (VALUES T T) instead.
455 b: (SUBTYPEP 'EXTENDED-CHAR 'CHARACTER) => NIL, NIL
456 but should be (VALUES T T) instead.
457 c: (SUBTYPEP '(INTEGER (0) (0)) 'NIL) dies with nested errors.
458 d: In general, the system doesn't like '(INTEGER (0) (0)) -- it
459 blows up at the level of SPECIFIER-TYPE with
460 "Lower bound (0) is greater than upper bound (0)." Probably
461 SPECIFIER-TYPE should return NIL instead.
462 e: (TYPEP 0 '(COMPLEX (EQL 0)) fails with
463 "Component type for Complex is not numeric: (EQL 0)."
464 This might be easy to fix; the type system already knows
465 that (SUBTYPEP '(EQL 0) 'NUMBER) is true.
466 f: The type system doesn't know about the condition system,
467 so that e.g. (TYPEP 'SIMPLE-ERROR 'ERROR)=>NIL.
468 g: The type system isn't all that smart about relationships
469 between hairy types, as shown in the type.erg test results,
470 e.g. (SUBTYPEP 'CONS '(NOT ATOM)) => NIL, NIL.
473 miscellaneous errors reported by Peter Van Eynde July 25, 2000:
475 (DEFGENERIC FOO02 (X))
476 (DEFMETHOD FOO02 ((X NUMBER)) T)
477 (LET ((M (FIND-METHOD (FUNCTION FOO02)
479 (LIST (FIND-CLASS (QUOTE NUMBER))))))
480 (REMOVE-METHOD (FUNCTION FOO02) M)
481 (DEFGENERIC FOO03 (X))
482 (ADD-METHOD (FUNCTION FOO03) M)))
483 should give an error, but SBCL allows it.
484 b: READ should probably return READER-ERROR, not the bare
485 arithmetic error, when input a la "1/0" or "1e1000" causes
489 It has been reported (e.g. by Peter Van Eynde) that there are
490 several metaobject protocol "errors". (In order to fix them, we might
491 need to document exactly what metaobject protocol specification
492 we're following -- the current code is just inherited from PCL.)
495 another error from Peter Van Eynde 5 September 2000:
496 (FORMAT NIL "~F" "FOO") should work, but instead reports an error.
497 PVE submitted a patch to deal with this bug, but it exposes other
498 comparably serious bugs, so I didn't apply it. It looks as though
499 the FORMAT code needs a fair amount of rewriting in order to comply
500 with the various details of the ANSI spec.
503 The implementation of #'+ returns its single argument without
504 type checking, e.g. (+ "illegal") => "illegal".
507 In sbcl-0.6.7, there is no doc string for CL:PUSH, probably
508 because it's defined with the DEFMACRO-MUNDANELY macro and something
509 is wrong with doc string setting in that macro.
512 Attempting to use COMPILE on something defined by DEFMACRO fails:
513 (DEFMACRO FOO (X) (CONS X X))
515 Error in function C::GET-LAMBDA-TO-COMPILE:
516 #<Closure Over Function "DEFUN (SETF MACRO-FUNCTION)" {480E21B1}> was defined in a non-null environment.
519 (SUBTYPEP '(AND ZILCH INTEGER) 'ZILCH) => NIL, NIL
520 Note: I looked into fixing this in 0.6.11.15, but gave up. The
521 problem seems to be that there are two relevant type methods for
522 the subtypep operation, HAIRY :COMPLEX-SUBTYPEP-ARG2 and
523 INTERSECTION :COMPLEX-SUBTYPEP-ARG1, and only the first is
524 called. This could be fixed, but type dispatch is messy and
525 confusing enough already, I don't want to complicate it further.
526 Perhaps someday we can make CLOS cross-compiled (instead of compiled
527 after bootstrapping) so that we don't need to have the type system
528 available before CLOS, and then we can rewrite the type methods to
529 CLOS methods, and then expressing the solutions to stuff like this
530 should become much more straightforward. -- WHN 2001-03-14
533 CL:*DEFAULT-PATHNAME-DEFAULTS* doesn't behave as ANSI suggests (reflecting
534 current working directory). And there's no supported way to update
535 or query the current working directory (a la Unix "chdir" and "pwd"),
536 which is functionality that ILISP needs (and currently gets with low-level
540 The debugger LIST-LOCATIONS command doesn't work properly.
543 Compiling and loading
544 (DEFUN FAIL (X) (THROW 'FAIL-TAG X))
546 then requesting a BACKTRACE at the debugger prompt gives no information
547 about where in the user program the problem occurred.
550 The compiler is supposed to do type inference well enough that
553 ((SIMPLE-ARRAY SINGLE-FLOAT)
555 (DECLARE (TYPE (SIMPLE-ARRAY SINGLE-FLOAT) X))
558 is redundant. However, as reported by Juan Jose Garcia Ripoll for
559 CMU CL, it sometimes doesn't. Adding declarations is a pretty good
560 workaround for the problem for now, but can't be done by the TYPECASE
561 macros themselves, since it's too hard for the macro to detect
562 assignments to the variable within the clause.
563 Note: The compiler *is* smart enough to do the type inference in
564 many cases. This case, derived from a couple of MACROEXPAND-1
565 calls on Ripoll's original test case,
567 (DECLARE (OPTIMIZE SPEED (SAFETY 0)))
568 (COND ((TYPEP A '(SIMPLE-ARRAY SINGLE-FLOAT)) NIL
569 (LET ((LENGTH (ARRAY-TOTAL-SIZE A)))
570 (LET ((I 0) (G2554 LENGTH))
571 (DECLARE (TYPE REAL G2554) (TYPE REAL I))
574 (WHEN (>= I G2554) (GO SB-LOOP::END-LOOP))
575 (SETF (ROW-MAJOR-AREF A I) (- (ROW-MAJOR-AREF A I)))
576 (GO SB-LOOP::NEXT-LOOP)
577 SB-LOOP::END-LOOP))))))
578 demonstrates the problem; but the problem goes away if the TAGBODY
579 and GO forms are removed (leaving the SETF in ordinary, non-looping
580 code), or if the TAGBODY and GO forms are retained, but the
581 assigned value becomes 0.0 instead of (- (ROW-MAJOR-AREF A I)).
584 Paul Werkowski wrote on cmucl-imp@cons.org 2000-11-15
585 I am looking into this problem that showed up on the cmucl-help
586 list. It seems to me that the "implementation specific environment
587 hacking functions" found in pcl/walker.lisp are completely messed
588 up. The good thing is that they appear to be barely used within
589 PCL and the munged environment object is passed to cmucl only
590 in calls to macroexpand-1, which is probably why this case fails.
591 SBCL uses essentially the same code, so if the environment hacking
592 is screwed up, it affects us too.
595 Using the pretty-printer from the command prompt gives funny
596 results, apparently because the pretty-printer doesn't know
597 about user's command input, including the user's carriage return
598 that the user, and therefore the pretty-printer thinks that
599 the new output block should start indented 2 or more characters
600 rightward of the correct location.
603 (probably related to bug #70)
604 As reported by Carl Witty on submit@bugs.debian.org 1999-05-08,
606 (in-package "CL-USER")
607 (defun equal-terms (termx termy)
609 ((alpha-equal-bound-term-lists (listx listy)
610 (or (and (null listx) (null listy))
612 (let ((bindings-x (bindings-of-bound-term (car listx)))
613 (bindings-y (bindings-of-bound-term (car listy))))
614 (if (and (null bindings-x) (null bindings-y))
615 (alpha-equal-terms (term-of-bound-term (car listx))
616 (term-of-bound-term (car listy)))
617 (and (= (length bindings-x) (length bindings-y))
619 (enter-binding-pairs (bindings-of-bound-term (car listx))
620 (bindings-of-bound-term (car listy)))
621 (alpha-equal-terms (term-of-bound-term (car listx))
622 (term-of-bound-term (car listy)))
623 (exit-binding-pairs (bindings-of-bound-term (car listx))
624 (bindings-of-bound-term (car listy)))))))
625 (alpha-equal-bound-term-lists (cdr listx) (cdr listy)))))
627 (alpha-equal-terms (termx termy)
628 (if (and (variable-p termx)
630 (equal-bindings (id-of-variable-term termx)
631 (id-of-variable-term termy))
632 (and (equal-operators-p (operator-of-term termx) (operator-of-term termy))
633 (alpha-equal-bound-term-lists (bound-terms-of-term termx)
634 (bound-terms-of-term termy))))))
638 (with-variable-invocation (alpha-equal-terms termx termy))))))
639 causes an assertion failure
640 The assertion (EQ (C::LAMBDA-TAIL-SET C::CALLER)
641 (C::LAMBDA-TAIL-SET (C::LAMBDA-HOME C::CALLEE))) failed.
643 Bob Rogers reports (1999-07-28 on cmucl-imp@cons.org) a smaller test
644 case with the same problem:
645 (defun parse-fssp-alignment ()
646 ;; Given an FSSP alignment file named by the argument . . .
647 (labels ((get-fssp-char ()
651 ;; Stub body, enough to tickle the bug.
652 (list (read-fssp-char)
656 ANSI specifies that the RESULT-TYPE argument of CONCATENATE must be
657 a subtype of SEQUENCE, but CONCATENATE doesn't check this properly:
658 (CONCATENATE 'SIMPLE-ARRAY #(1 2) '(3)) => #(1 2 3)
659 This also leads to funny behavior when derived type specifiers
660 are used, as originally reported by Milan Zamazal for CMU CL (on the
661 Debian bugs mailing list (?) 2000-02-27), then reported by Martin
662 Atzmueller for SBCL (2000-10-01 on sbcl-devel@lists.sourceforge.net):
663 (DEFTYPE FOO () 'SIMPLE-ARRAY)
664 (CONCATENATE 'FOO #(1 2) '(3))
665 => #<ARRAY-TYPE SIMPLE-ARRAY> is a bad type specifier for
667 The derived type specifier FOO should act the same way as the
668 built-in type SIMPLE-ARRAY here, but it doesn't. That problem
669 doesn't seem to exist for sequence types:
670 (DEFTYPE BAR () 'SIMPLE-VECTOR)
671 (CONCATENATE 'BAR #(1 2) '(3)) => #(1 2 3)
674 As reported by Winton Davies on a CMU CL mailing list 2000-01-10,
675 and reported for SBCL by Martin Atzmueller 2000-10-20: (TRACE GETHASH)
676 crashes SBCL. In general tracing anything which is used in the
677 implementation of TRACE is likely to have the same problem.
680 As reported by Daniel Solaz on cmucl-help@cons.org 2000-11-23,
681 SXHASH returns the same value for all non-STRUCTURE-OBJECT instances,
682 notably including all PCL instances. There's a limit to how much
683 SXHASH can do to return unique values for instances, but at least
684 it should probably look at the class name, the way that it does
685 for STRUCTURE-OBJECTs.
688 As reported by Martin Atzmueller on the sbcl-devel list 2000-11-22,
689 > There remains one issue, that is a bug in SBCL:
690 > According to my interpretation of the spec, the ":" and "@" modifiers
691 > should appear _after_ the comma-seperated arguments.
692 > Well, SBCL (and CMUCL for that matter) accept
693 > (ASSERT (STRING= (FORMAT NIL "~:8D" 1) " 1"))
694 > where the correct way (IMHO) should be
695 > (ASSERT (STRING= (FORMAT NIL "~8:D" 1) " 1"))
696 Probably SBCL should stop accepting the "~:8D"-style format arguments,
697 or at least issue a warning.
700 (probably related to bug #65)
701 The compiler doesn't like &OPTIONAL arguments in LABELS and FLET
703 (DEFUN FIND-BEFORE (ITEM SEQUENCE &KEY (TEST #'EQL))
704 (LABELS ((FIND-ITEM (OBJ SEQ TEST &OPTIONAL (VAL NIL))
705 (LET ((ITEM (FIRST SEQ)))
708 ((FUNCALL TEST OBJ ITEM)
711 (FIND-ITEM OBJ (REST SEQ) TEST (NCONC VAL `(,ITEM))))))))
712 (FIND-ITEM ITEM SEQUENCE TEST)))
713 from David Young's bug report on cmucl-help@cons.org 30 Nov 2000
714 causes sbcl-0.6.9 to fail with
715 error in function SB-KERNEL:ASSERT-ERROR:
716 The assertion (EQ (SB-C::LAMBDA-TAIL-SET SB-C::CALLER)
717 (SB-C::LAMBDA-TAIL-SET
718 (SB-C::LAMBDA-HOME SB-C::CALLEE))) failed.
721 (DECLAIM (OPTIMIZE ..)) doesn't work. E.g. even after
722 (DECLAIM (OPTIMIZE (SPEED 3))), things are still optimized with
723 the previous SPEED policy. This bug will probably get fixed in
724 0.6.9.x in a general cleanup of optimization policy.
727 (DECLAIM (OPTIMIZE ..)) doesn't work properly inside LOCALLY forms.
730 As noted in the ANSI specification for COERCE, (COERCE 3 'COMPLEX)
731 gives a result which isn't COMPLEX. The result type optimizer
732 for COERCE doesn't know this, perhaps because it was written before
733 ANSI threw this curveball: the optimizer thinks that COERCE always
734 returns a result of the specified type. Thus while the interpreted
736 (DEFUN TRICKY (X) (TYPEP (COERCE X 'COMPLEX) 'COMPLEX))
737 returns the correct result,
739 the compiled function
745 As reported by Martin Atzmueller on sbcl-devel 26 Dec 2000,
746 ANSI says that WITH-OUTPUT-TO-STRING should have a keyword
747 :ELEMENT-TYPE, but in sbcl-0.6.9 this is not defined for
748 WITH-OUTPUT-TO-STRING.
751 ANSI says in one place that type declarations can be abbreviated even
752 when the type name is not a symbol, e.g.
753 (DECLAIM ((VECTOR T) *FOOVECTOR*))
754 SBCL doesn't support this. But ANSI says in another place that this
755 isn't allowed. So it's not clear this is a bug after all. (See the
756 e-mail on cmucl-help@cons.org on 2001-01-16 and 2001-01-17 from WHN
760 as pointed out by Dan Barlow on sbcl-devel 2000-07-02:
761 The PICK-TEMPORARY-FILE-NAME utility used by LOAD-FOREIGN uses
762 an easily guessable temporary filename in a way which might open
763 applications using LOAD-FOREIGN to hijacking by malicious users
764 on the same machine. Incantations for doing this safely are
765 floating around the net in various "how to write secure programs
766 despite Unix" documents, and it would be good to (1) fix this in
767 LOAD-FOREIGN, and (2) hunt for any other code which uses temporary
768 files and make it share the same new safe logic.
771 (fixed early Feb 2001 by MNA)
774 As reported by wbuss@TELDA.NET (Wolfhard Buss) on cmucl-help
777 (loop with (a . b) of-type float = '(0.0 . 1.0)
778 and (c . d) of-type float = '(2.0 . 3.0)
779 return (list a b c d))
780 should evaluate to (0.0 1.0 2.0 3.0). cmucl-18c disagrees and
781 invokes the debugger: "B is not of type list".
782 SBCL does the same thing.
785 Functions are assigned names based on the context in which they're
786 defined. This is less than ideal for the functions which are
787 used to implement CLOS methods. E.g. the output of
788 (DESCRIBE 'PRINT-OBJECT) lists functions like
789 #<FUNCTION "DEF!STRUCT (TRACE-INFO (:MAKE-LOAD-FORM-FUN SB-KERNEL:JUST-DUMP-IT-NORMALLY) (:PRINT-OBJECT #))" {1020E49}>
791 #<FUNCTION "MACROLET ((FORCE-DELAYED-DEF!METHODS NIL #))" {1242871}>
792 It would be better if these functions' names always identified
793 them as methods, and identified their generic functions and
797 RANDOM-INTEGER-EXTRA-BITS=10 may not be large enough for the RANDOM
798 RNG to be high quality near RANDOM-FIXNUM-MAX; it looks as though
799 the mean of the distribution can be systematically O(0.1%) wrong.
800 Just increasing R-I-E-B is probably not a good solution, since
801 it would decrease efficiency more than is probably necessary. Perhaps
802 using some sort of accept/reject method would be better.
805 (SUBTYPEP '(SATISFIES SOME-UNDEFINED-FUN) NIL)=>NIL,T (should be NIL,NIL)
808 Internally the compiler sometimes evaluates
809 (sb-kernel:type/= (specifier-type '*) (specifier-type t))
810 (I stumbled across this when I added an
811 (assert (not (eq type1 *wild-type*)))
812 in the NAMED :SIMPLE-= type method.) '* isn't really a type, and
813 in a type context should probably be translated to T, and so it's
814 probably to ask whether it's equal to the T type and then (using the
815 EQ type comparison in the NAMED :SIMPLE-= type method) return NIL.
816 (I haven't tried to investigate this bug enough to guess whether
817 there might be any user-level symptoms.)
820 Despite what the manual says, (DECLAIM (SPEED 0)) doesn't cause
821 things to be byte compiled. This seems to be true in cmucl-2.4.19,
822 too: (COMPILE-FILE .. :BYTE-COMPILE T) causes byte-compilation,
823 but ordinary COMPILE-FILE of a file containing (DECLAIM (SPEED 0))
827 a latent cross-compilation/bootstrapping bug: The cross-compilation
828 host's CL:CHAR-CODE-LIMIT is used in target code in readtable.lisp
829 and possibly elsewhere. Instead, we should use the target system's
830 CHAR-CODE-LIMIT. This will probably cause problems if we try to
831 bootstrap on a system which uses a different value of CHAR-CODE-LIMIT
835 KNOWN BUGS RELATED TO THE IR1 INTERPRETER
837 (Note: At some point, the pure interpreter (actually a semi-pure
838 interpreter aka "the IR1 interpreter") will probably go away, replaced
840 (DEFUN EVAL (X) (FUNCALL (COMPILE NIL (LAMBDA ..)))))
841 and at that time these bugs should either go away automatically or
842 become more tractable to fix. Until then, they'll probably remain,
843 since some of them aren't considered urgent, and the rest are too hard
844 to fix as long as so many special cases remain. After the IR1
845 interpreter goes away is also the preferred time to start
846 systematically exterminating cases where debugging functionality
847 (backtrace, breakpoint, etc.) breaks down, since getting rid of the
848 IR1 interpreter will reduce the number of special cases we need to
852 The FUNCTION special operator doesn't check properly whether its
853 argument is a function name. E.g. (FUNCTION (X Y)) returns a value
854 instead of failing with an error. (Later attempting to funcall the
855 value does cause an error.)
858 COMPILED-FUNCTION-P bogusly reports T for interpreted functions:
859 * (DEFUN FOO (X) (- 12 X))
861 * (COMPILED-FUNCTION-P #'FOO)
866 (DEFVAR *SUPPRESS-P* T)
867 (EVAL '(UNLESS *SUPPRESS-P*
868 (EVAL-WHEN (:COMPILE-TOPLEVEL :LOAD-TOPLEVEL :EXECUTE)
869 (FORMAT T "surprise!"))))
870 prints "surprise!". Probably the entire EVAL-WHEN mechanism ought to be
871 rewritten from scratch to conform to the ANSI definition, abandoning
872 the *ALREADY-EVALED-THIS* hack which is used in sbcl-0.6.8.9 (and
873 in the original CMU CL source, too). This should be easier to do --
874 though still nontrivial -- once the various IR1 interpreter special
878 EVAL-WHEN's idea of what's a toplevel form is even more screwed up
879 than the example in IR1-3 would suggest, since COMPILE-FILE and
880 COMPILE both print both "right now!" messages when compiling the
884 (EVAL-WHEN (:COMPILE-TOPLEVEL :LOAD-TOPLEVEL :EXECUTE)
885 (PRINT "yes! right now!"))
888 (EVAL-WHEN (:COMPILE-TOPLEVEL :LOAD-TOPLEVEL :EXECUTE)
889 (PRINT "no! right now!"))
891 and while EVAL doesn't print the "right now!" messages, the first
892 FUNCALL on the value returned by EVAL causes both of them to be printed.
895 The system accepts DECLAIM in most places where DECLARE would be
896 accepted, without even issuing a warning. ANSI allows this, but since
897 it's fairly easy to mistype DECLAIM instead of DECLARE, and the
898 meaning is rather different, and it's unlikely that the user
899 has a good reason for doing DECLAIM not at top level, it would be
900 good to issue a STYLE-WARNING when this happens. A possible
901 fix would be to issue STYLE-WARNINGs for DECLAIMs not at top level,
902 or perhaps to issue STYLE-WARNINGs for any EVAL-WHEN not at top level.
903 [This is considered an IR1-interpreter-related bug because until
904 EVAL-WHEN is rewritten, which won't happen until after the IR1
905 interpreter is gone, the system's notion of what's a top-level form
906 and what's not will remain too confused to fix this problem.]