the program loops endlessly instead of printing the object.
-KNOWN BUGS RELATED TO THE IR1 INTERPRETER
-
-(Note: At some point, the pure interpreter (aka the "IR1 interpreter")
-will probably go away (replaced by constructs like
- (DEFUN EVAL (X) (FUNCALL (COMPILE NIL (LAMBDA ..)))))
-and at that time these bugs should go away automatically. Until then,
-they'll probably remain, since they're not considered urgent.
-After the IR1 interpreter goes away is also the preferred time
-to start systematically exterminating cases where debugging
-functionality (backtrace, breakpoint, etc.) breaks down, since
-getting rid of the IR1 interpreter will reduce the number of
-special cases we need to support.)
+NOTES:
-IR1-1:
- The FUNCTION special operator doesn't check properly whether its
- argument is a function name. E.g. (FUNCTION (X Y)) returns a value
- instead of failing with an error. (Later attempting to funcall the
- value does cause an error.)
+There is also some information on bugs in the manual page and
+in the TODO file. Eventually more such information may move here.
-IR1-2:
- COMPILED-FUNCTION-P bogusly reports T for interpreted functions:
- * (DEFUN FOO (X) (- 12 X))
- FOO
- * (COMPILED-FUNCTION-P #'FOO)
- T
+The gaps in the number sequence belong to old bug descriptions which
+have gone away (typically because they were fixed, but sometimes for
+other reasons, e.g. because they were moved elsewhere).
KNOWN BUGS OF NO SPECIAL CLASS:
-(Note:
- * There is also some information on bugs in the manual page and
- in the TODO file. Eventually more such information may move here.
- * The gaps in the number sequence belong to old bugs which were
- eliminated.)
-
2:
- DEFSTRUCT should almost certainly overwrite the old LAYOUT information
+ DEFSTRUCT almost certainly should overwrite the old LAYOUT information
instead of just punting when a contradictory structure definition
- is loaded.
+ is loaded. As it is, if you redefine DEFSTRUCTs in a way which
+ changes their layout, you probably have to rebuild your entire
+ program, even if you know or guess enough about the internals of
+ SBCL to wager that this (undefined in ANSI) operation would be safe.
3:
- It should cause a STYLE-WARNING, not a full WARNING, when a structure
- slot default value does not match the declared structure slot type.
- (The current behavior is consistent with SBCL's behavior elsewhere,
- and would not be a problem, except that the other behavior is
- specifically required by the ANSI spec.)
-
-4:
- It should cause a note, not a WARNING, when the system ignores
- an FTYPE proclamation for a slot accessor.
-
-5:
- Error reporting on various stream-requiring operations is not
- very good when the stream argument has the wrong type, because
- the operation tries to fall through to Gray stream code, and then
- dies because it's undefined. E.g.
- (PRINT-UNREADABLE-OBJECT (*STANDARD-OUTPUT* 1))
- gives the error message
- error in SB-KERNEL::UNDEFINED-SYMBOL-ERROR-HANDLER:
- The function SB-IMPL::STREAM-WRITE-STRING is undefined.
- It would be more useful and correct to signal a TYPE-ERROR:
- not a STREAM: 1
- (It wouldn't be terribly difficult to write stubs for all the
- Gray stream functions that the old CMU CL code expects, with
- each stub just raising the appropriate TYPE-ERROR.)
+ ANSI specifies that a type mismatch in a structure slot
+ initialization value should not cause a warning.
+WORKAROUND:
+ This one might not be fixed for a while because while we're big
+ believers in ANSI compatibility and all, (1) there's no obvious
+ simple way to do it (short of disabling all warnings for type
+ mismatches everywhere), and (2) there's a good portable
+ workaround. ANSI justifies this specification by saying
+ The restriction against issuing a warning for type mismatches
+ between a slot-initform and the corresponding slot's :TYPE
+ option is necessary because a slot-initform must be specified
+ in order to specify slot options; in some cases, no suitable
+ default may exist.
+ In SBCL, as in CMU CL (or, for that matter, any compiler which
+ really understands Common Lisp types) a suitable default does
+ exist, in all cases, because the compiler understands the concept
+ of functions which never return (i.e. has return type NIL, e.g.
+ ERROR). Thus, as a portable workaround, you can use a call to
+ some known-never-to-return function as the default. E.g.
+ (DEFSTRUCT FOO
+ (BAR (ERROR "missing :BAR argument")
+ :TYPE SOME-TYPE-TOO-HAIRY-TO-CONSTRUCT-AN-INSTANCE-OF))
+ or
+ (DECLAIM (FTYPE () NIL) MISSING-ARG)
+ (DEFUN REQUIRED-ARG () ; workaround for SBCL non-ANSI slot init typing
+ (ERROR "missing required argument"))
+ (DEFSTRUCT FOO
+ (BAR (REQUIRED-ARG) :TYPE TRICKY-TYPE-OF-SOME-SORT)
+ (BLETCH (REQUIRED-ARG) :TYPE TRICKY-TYPE-OF-SOME-SORT)
+ (N-REFS-SO-FAR 0 :TYPE (INTEGER 0)))
+ Such code will compile without complaint and work correctly either
+ on SBCL or on a completely compliant Common Lisp system.
6:
bogus warnings about undefined functions for magic functions like
SB!C::%%DEFUN and SB!C::%DEFCONSTANT when cross-compiling files
- like src/code/float.lisp
+ like src/code/float.lisp. Fixing this will probably require
+ straightening out enough bootstrap consistency issues that
+ the cross-compiler can run with *TYPE-SYSTEM-INITIALIZED*.
+ Instead, the cross-compiler runs in a slightly flaky state
+ which is sane enough to compile SBCL itself, but which is
+ also unstable in several ways, including its inability
+ to really grok function declarations.
7:
The "byte compiling top-level form:" output ought to be condensed.
Perhaps any number of such consecutive lines ought to turn into a
single "byte compiling top-level forms:" line.
-8:
- Compiling a file containing the erroneous program
- (DEFSTRUCT FOO
- A
- B)
- (DEFSTRUCT (BAR (:INCLUDE FOO))
- A
- B)
- gives only the not-very-useful message
- caught ERROR:
- (during macroexpansion)
- Condition PROGRAM-ERROR was signalled.
- (The specific message which says that the problem was duplicate
- slot names gets lost.)
-
-9:
- The handling of IGNORE declarations on lambda list arguments of
- DEFMETHOD is at least weird, and in fact seems broken and useless.
- I should fix up another layer of binding, declared IGNORABLE, for
- typed lambda list arguments.
-
10:
The way that the compiler munges types with arguments together
with types with no arguments (in e.g. TYPE-EXPAND) leads to
The situation is complicated by the presence of Common Lisp types
like UNSIGNED-BYTE (which can either be used in list form or alone)
so I'm not 100% sure that the behavior above is actually illegal.
- But I'm 90+% sure, and someday perhaps I'll be motivated to look it up..
+ But I'm 90+% sure, and the following related behavior,
+ (TYPEP 11 'AND) => T
+ treating the bare symbol AND as equivalent to '(AND), is specifically
+ forbidden (by the ANSI specification of the AND type).
11:
It would be nice if the
(during macroexpansion of IN-PACKAGE,
during macroexpansion of DEFFOO)
-12:
- The type system doesn't understand the KEYWORD type very well:
- (SUBTYPEP 'KEYWORD 'SYMBOL) => NIL, NIL
- It might be possible to fix this by changing the definition of
- KEYWORD to (AND SYMBOL (SATISFIES KEYWORDP)), but the type system
- would need to be a bit smarter about AND types, too:
- (SUBTYPEP '(AND SYMBOL KEYWORD) 'SYMBOL) => NIL, NIL
- (The type system does know something about AND types already,
- (SUBTYPEP '(AND INTEGER FLOAT) 'NUMBER) => T, T
- (SUBTYPEP '(AND INTEGER FIXNUM) 'NUMBER) =>T, T
- so likely this is a small patch.)
-
-13:
- Floating point infinities are screwed up. [When I was converting CMU CL
- to SBCL, I was looking for complexity to delete, and I thought it was safe
- to just delete support for floating point infinities. It wasn't: they're
- generated by the floating point hardware even when we remove support
- for them in software. -- WHN] Support for them should be restored.
-
-14:
- The ANSI syntax for non-STANDARD method combination types in CLOS is
- (DEFGENERIC FOO (X) (:METHOD-COMBINATION PROGN))
- (DEFMETHOD FOO PROGN ((X BAR)) (PRINT 'NUMBER))
- If you mess this up, omitting the PROGN qualifier in in DEFMETHOD,
- (DEFGENERIC FOO (X) (:METHOD-COMBINATION PROGN))
- (DEFMETHOD FOO ((X BAR)) (PRINT 'NUMBER))
- the error mesage is not easy to understand:
- INVALID-METHOD-ERROR was called outside the dynamic scope
- of a method combination function (inside the body of
- DEFINE-METHOD-COMBINATION or a method on the generic
- function COMPUTE-EFFECTIVE-METHOD).
- It would be better if it were more informative, a la
- The method combination type for this method (STANDARD) does
- not match the method combination type for the generic function
- (PROGN).
- Also, after you make the mistake of omitting the PROGN qualifier
- on a DEFMETHOD, doing a new DEFMETHOD with the correct qualifier
- no longer works:
- (DEFMETHOD FOO PROGN ((X BAR)) (PRINT 'NUMBER))
- gives
- INVALID-METHOD-ERROR was called outside the dynamic scope
- of a method combination function (inside the body of
- DEFINE-METHOD-COMBINATION or a method on the generic
- function COMPUTE-EFFECTIVE-METHOD).
- This is not very helpful..
-
15:
(SUBTYPEP '(FUNCTION (T BOOLEAN) NIL)
'(FUNCTION (FIXNUM FIXNUM) NIL)) => T, T
(Also, when this is fixed, we can enable the code in PROCLAIM which
checks for incompatible FTYPE redeclarations.)
-16:
- The ANSI spec says that CONS can be a compound type spec, e.g.
- (CONS FIXNUM REAL). SBCL doesn't support this.
-
-17:
- from Paolo Amoroso on the CMU CL mailing list 27 Feb 2000:
-I use CMU CL 18b under Linux. When COMPILE-FILE is supplied a physical
-pathname, the type of the corresponding compiled file is X86F:
- * (compile-file "/home/paolo/lisp/tools/foo")
- Python version 1.0, VM version Intel x86 on 27 FEB 0 06:00:46 pm.
- Compiling: /home/paolo/lisp/tools/foo.lisp 27 FEB 0 05:57:42 pm
- Converted SQUARE.
- Compiling DEFUN SQUARE:
- Byte Compiling Top-Level Form:
- /home/paolo/lisp/tools/foo.x86f written.
- Compilation finished in 0:00:00.
- #p"/home/paolo/lisp/tools/foo.x86f"
- NIL
- NIL
-But when the function is called with a logical pathname, the file type
-becomes FASL:
- * (compile-file "tools:foo")
- Python version 1.0, VM version Intel x86 on 27 FEB 0 06:01:04 pm.
- Compiling: /home/paolo/lisp/tools/foo.lisp 27 FEB 0 05:57:42 pm
- Converted SQUARE.
- Compiling DEFUN SQUARE:
- Byte Compiling Top-Level Form:
- TOOLS:FOO.FASL written.
- Compilation finished in 0:00:00.
- #p"/home/paolo/lisp/tools/foo.fasl"
- NIL
- NIL
-
18:
from DTC on the CMU CL mailing list 25 Feb 2000:
;;; Compiler fails when this file is compiled.
DTC's recommended workaround from the mailing list 3 Mar 2000:
(setf (pcl::find-class 'ccc1) (pcl::find-class 'ccc))
-21:
- There's probably a bug in the compiler handling of special variables
- in closures, inherited from the CMU CL code, as reported on the
- CMU CL mailing list. There's a patch for this on the CMU CL
- mailing list too:
- Message-ID: <38C8E188.A1E38B5E@jeack.com.au>
- Date: Fri, 10 Mar 2000 22:50:32 +1100
- From: "Douglas T. Crosher" <dtc@jeack.com.au>
-
22:
The ANSI spec, in section "22.3.5.2 Tilde Less-Than-Sign: Logical Block",
says that an error is signalled if ~W, ~_, ~<...~:>, ~I, or ~:T is used
a secondary error "caught ERROR: unrecoverable error during compilation"
and then return with FAILURE-P true,
-25:
- from CMU CL mailing list 01 May 2000
-
-I realize I can take care of this by doing (proclaim (ignore pcl::.slots1.))
-but seeing as .slots0. is not-exported, shouldn't it be ignored within the
-+expansion
-when not used?
-
-In: DEFMETHOD FOO-BAR-BAZ (RESOURCE-TYPE)
- (DEFMETHOD FOO-BAR-BAZ
- ((SELF RESOURCE-TYPE))
- (SETF (SLOT-VALUE SELF 'NAME) 3))
---> BLOCK MACROLET PCL::FAST-LEXICAL-METHOD-FUNCTIONS
---> PCL::BIND-FAST-LEXICAL-METHOD-MACROS MACROLET
---> PCL::BIND-LEXICAL-METHOD-FUNCTIONS LET PCL::BIND-ARGS LET* PCL::PV-BINDING
---> PCL::PV-BINDING1 PCL::PV-ENV LET
-==>
- (LET ((PCL::.SLOTS0. #))
- (PROGN SELF)
- (BLOCK FOO-BAR-BAZ
- (LET #
- #)))
-Warning: Variable PCL::.SLOTS0. defined but never used.
-
-Compilation unit finished.
- 1 warning
-
-#<Standard-Method FOO-BAR-BAZ (RESOURCE-TYPE) {480918FD}>
-
26:
reported by Sam Steingold on the cmucl-imp mailing list 12 May 2000:
-
-Also, there is another bug: `array-displacement' should return an array
-or nil as first value (as per ANSI CL), while CMUCL declares it as
-returning an array as first value always.
+ Also, there is another bug: `array-displacement' should return an
+ array or nil as first value (as per ANSI CL), while CMUCL declares
+ it as returning an array as first value always.
+ (Actually, I think the old CMU CL version in SBCL never returns NIL,
+ i.e. it's not just a declaration problem, but the definition doesn't
+ behave ANSIly.)
27:
Sometimes (SB-EXT:QUIT) fails with
Process inferior-lisp exited abnormally with code 1
I haven't noticed a repeatable case of this yet.
-28:
- The system accepts DECLAIM in most places where DECLARE would be
- accepted, without even issuing a warning. ANSI allows this, but since
- it's fairly easy to mistype DECLAIM instead of DECLARE, and the
- meaning is rather different, and it's unlikely that the user
- has a good reason for doing DECLAIM not at top level, it would be
- good to issue a STYLE-WARNING when this happens. A possible
- fix would be to issue STYLE-WARNINGs for DECLAIMs not at top level,
- or perhaps to issue STYLE-WARNINGs for any EVAL-WHEN not at top level.
-
29:
some sort of bug in inlining and RETURN-FROM in sbcl-0.6.5: Compiling
(DEFUN BAR? (X)
The assertion (EQ (SB-C::CONTINUATION-KIND SB-C::CONT) :BLOCK-START) failed.
This is still present in sbcl-0.6.8.
-30:
- The CMU CL reader code takes liberties in binding the standard read table
- when reading the names of characters. Tim Moore posted a patch to the
- CMU CL mailing list Mon, 22 May 2000 21:30:41 -0700.
-
31:
In some cases the compiler believes type declarations on array
elements without checking them, e.g.
And as long as we're wishing, it would be awfully nice if INSPECT could
also report on closures, telling about the values of the bound variables.
-34:
- as reported by Robert Strandh on the CMU CL mailing list 12 Jun 2000:
- $ cat xx.lisp
- (defconstant +a-constant+ (make-instance 'a-class))
- (defconstant +another-constant+ (vector +a-constant+))
- $ lisp
- CMU Common Lisp release x86-linux 2.4.19 8 February 2000 build 456,
- running on
- bobby
- Send bug reports and questions to your local CMU CL maintainer,
- or to pvaneynd@debian.org
- or to cmucl-help@cons.org. (prefered)
- type (help) for help, (quit) to exit, and (demo) to see the demos
- Loaded subsystems:
- Python 1.0, target Intel x86
- CLOS based on PCL version: September 16 92 PCL (f)
- * (defclass a-class () ())
- #<STANDARD-CLASS A-CLASS {48027BD5}>
- * (compile-file "xx.lisp")
- Python version 1.0, VM version Intel x86 on 12 JUN 00 08:12:55 am.
- Compiling:
- /home/strandh/Research/Functional/Common-Lisp/CLIM/Development/McCLIM
- /xx.lisp 12 JUN 00 07:47:14 am
- Compiling Load Time Value of (PCL::GET-MAKE-INSTANCE-FUNCTION-SYMBOL
- '(A-CLASS NIL NIL)):
- Byte Compiling Top-Level Form:
- Error in function C::DUMP-STRUCTURE: Attempt to dump invalid
- structure:
- #<A-CLASS {4803A5B5}>
- How did this happen?
-
35:
The compiler assumes that any time a function of declared FTYPE
doesn't signal an error, its arguments were of the declared type.
make sense to add another flag (CHECKED?) to DEFKNOWN to
identify functions which *do* check their argument types.)
-36:
- As pointed out by Martin Cracauer on the CMU CL mailing list
- 13 Jun 2000, the :FILE-LENGTH operation for
- FD-STREAM-MISC-ROUTINE is broken for large files: it says
- (THE INDEX SIZE) even though SIZE can be larger than INDEX.
-
-37:
- In SBCL 0.6.5 (and CMU CL 18b) compiling and loading
- (in-package :cl-user)
- (declaim (optimize (safety 3)
- (debug 3)
- (compilation-speed 2)
- (space 1)
- (speed 2)
- #+nil (sb-ext:inhibit-warnings 2)))
- (declaim (ftype (function * (values)) emptyvalues))
- (defun emptyvalues (&rest rest) (declare (ignore rest)) (values))
- (defstruct foo x y)
- (defgeneric assertoid ((x t)))
- (defmethod assertoid ((x t)) "just a placeholder")
- (defun bar (ht)
- (declare (type hash-table ht))
- (let ((res
- (block blockname
- (progn
- (prog1
- (emptyvalues)
- (assertoid (hash-table-count ht)))))))
- (unless (typep res 'foo)
- (locally
- (common-lisp-user::bad-result-from-assertive-typed-fun
- 'bar
- res)))))
- then executing
- (bar (make-hash-table))
- causes the failure
- Error in KERNEL::UNDEFINED-SYMBOL-ERROR-HANDLER:
- the function C::%INSTANCE-TYPEP is undefined.
- %INSTANCE-TYPEP is always supposed to be IR1-transformed away, but for
- some reason -- the (VALUES) return value declaration? -- the optimizer is
- confused and compiles a full call to %INSTANCE-TYPEP (which doesn't exist
- as a function) instead.
-
-37a:
- The %INSTANCE-TYPEP problem in bug 37 comes up also when compiling
- and loading
- (IN-PACKAGE :CL-USER)
- (LOCALLY
- (DECLARE (OPTIMIZE (SAFETY 3) (SPEED 2) (SPACE 2)))
- (DECLAIM (FTYPE (FUNCTION (&REST T) (VALUES)) EMPTYVALUES))
- (DEFUN EMPTYVALUES (&REST REST)
- (DECLARE (IGNORE REST))
- (VALUES))
- (DEFSTRUCT DUMMYSTRUCT X Y)
- (DEFUN FROB-EMPTYVALUES (X)
- (LET ((RES (EMPTYVALUES X X X)))
- (UNLESS (TYPEP RES 'DUMMYSTRUCT)
- 'EXPECTED-RETURN-VALUE))))
- (ASSERT (EQ (FROB-EMPTYVALUES 11) 'EXPECTED-RETURN-VALUE))
-
-
38:
DEFMETHOD doesn't check the syntax of &REST argument lists properly,
accepting &REST even when it's not followed by an argument name:
(DEFMETHOD FOO ((X T) &REST) NIL)
-39:
- On the CMU CL mailing list 26 June 2000, Douglas Crosher wrote
-
- Hannu Rummukainen wrote:
- ...
- > There's something weird going on with the compilation of the attached
- > code. Compiling and loading the file in a fresh lisp, then invoking
- > (test-it) gives
- Thanks for the bug report, nice to have this one fixed. It was a bug
- in the x86 backend, the < VOP. A fix has been committed to the main
- source, see the file compiler/x86/float.lisp.
-
- Probably the same bug exists in SBCL.
-
-40:
- TYPEP treats the result of UPGRADED-ARRAY-ELEMENT-TYPE as gospel,
- so that (TYPEP (MAKE-ARRAY 3) '(VECTOR SOMETHING-NOT-DEFINED-YET))
- returns (VALUES T T). Probably it should be an error instead,
- complaining that the type SOMETHING-NOT-DEFINED-YET is not defined.
-
41:
TYPEP of VALUES types is sometimes implemented very inefficiently, e.g. in
(DEFTYPE INDEXOID () '(INTEGER 0 1000))
45:
a slew of floating-point-related errors reported by Peter Van Eynde
on July 25, 2000:
- a: (SQRT -9.0) fails, because SB-KERNEL::COMPLEX-SQRT is undefined.
- Similarly, COMPLEX-ASIN, COMPLEX-ACOS, COMPLEX-ACOSH, and others
- aren't found.
+ a: (fixed in sbcl-0.6.11.25)
b: SBCL's value for LEAST-POSITIVE-SHORT-FLOAT is bogus, and
should probably be 1.4012985e-45. In SBCL,
(/ LEAST-POSITIVE-SHORT-FLOAT 2) returns a number smaller
(EXPT 10.0d0 1000)
PVE's regression tests want them to raise errors. SBCL
generates the infinities instead, which may or may not be
- conforming behavior, but then blow it by being unable to
- output the infinities, since support for infinities is generally
- broken, and in particular SB-IMPL::OUTPUT-FLOAT-INFINITY is
- undefined.
+ conforming behavior.
d: (in section12.erg) various forms a la
(FLOAT 1 DOUBLE-FLOAT-EPSILON)
don't give the right behavior.
#<Closure Over Function "DEFUN (SETF MACRO-FUNCTION)" {480E21B1}> was defined in a non-null environment.
58:
- (SUBTYPEP '(AND ZILCH INTEGER) 'ZILCH)
- => NIL, NIL
+ (SUBTYPEP '(AND ZILCH INTEGER) 'ZILCH) => NIL, NIL
+ Note: I looked into fixing this in 0.6.11.15, but gave up. The
+ problem seems to be that there are two relevant type methods for
+ the subtypep operation, HAIRY :COMPLEX-SUBTYPEP-ARG2 and
+ INTERSECTION :COMPLEX-SUBTYPEP-ARG1, and only the first is
+ called. This could be fixed, but type dispatch is messy and
+ confusing enough already, I don't want to complicate it further.
+ Perhaps someday we can make CLOS cross-compiled (instead of compiled
+ after bootstrapping) so that we don't need to have the type system
+ available before CLOS, and then we can rewrite the type methods to
+ CLOS methods, and then expressing the solutions to stuff like this
+ should become much more straightforward. -- WHN 2001-03-14
59:
CL:*DEFAULT-PATHNAME-DEFAULTS* doesn't behave as ANSI suggests (reflecting
or query the current working directory (a la Unix "chdir" and "pwd"),
which is functionality that ILISP needs (and currently gets with low-level
hacks).
+ When this is fixed, probably the more-or-less-parallel Unix-level
+ hacks
+ DEFAULT-DIRECTORY
+ %SET-DEFAULT-DIRECTORY
+ etc.?
+ should go away. Also we need to figure out what's the proper way to
+ deal with the interaction of users assigning new values to
+ *DEFAULT-PATHNAME-DEFAULTS* and cores being saved and restored.
+ (Perhaps just make restoring from a save always overwrite the old
+ value with the new Unix-level default directory?)
60:
The debugger LIST-LOCATIONS command doesn't work properly.
(FAIL 12)
then requesting a BACKTRACE at the debugger prompt gives no information
about where in the user program the problem occurred.
+
+62:
+ The compiler is supposed to do type inference well enough that
+ the declaration in
+ (TYPECASE X
+ ((SIMPLE-ARRAY SINGLE-FLOAT)
+ (LOCALLY
+ (DECLARE (TYPE (SIMPLE-ARRAY SINGLE-FLOAT) X))
+ ..))
+ ..)
+ is redundant. However, as reported by Juan Jose Garcia Ripoll for
+ CMU CL, it sometimes doesn't. Adding declarations is a pretty good
+ workaround for the problem for now, but can't be done by the TYPECASE
+ macros themselves, since it's too hard for the macro to detect
+ assignments to the variable within the clause.
+ Note: The compiler *is* smart enough to do the type inference in
+ many cases. This case, derived from a couple of MACROEXPAND-1
+ calls on Ripoll's original test case,
+ (DEFUN NEGMAT (A)
+ (DECLARE (OPTIMIZE SPEED (SAFETY 0)))
+ (COND ((TYPEP A '(SIMPLE-ARRAY SINGLE-FLOAT)) NIL
+ (LET ((LENGTH (ARRAY-TOTAL-SIZE A)))
+ (LET ((I 0) (G2554 LENGTH))
+ (DECLARE (TYPE REAL G2554) (TYPE REAL I))
+ (TAGBODY
+ SB-LOOP::NEXT-LOOP
+ (WHEN (>= I G2554) (GO SB-LOOP::END-LOOP))
+ (SETF (ROW-MAJOR-AREF A I) (- (ROW-MAJOR-AREF A I)))
+ (GO SB-LOOP::NEXT-LOOP)
+ SB-LOOP::END-LOOP))))))
+ demonstrates the problem; but the problem goes away if the TAGBODY
+ and GO forms are removed (leaving the SETF in ordinary, non-looping
+ code), or if the TAGBODY and GO forms are retained, but the
+ assigned value becomes 0.0 instead of (- (ROW-MAJOR-AREF A I)).
+
+63:
+ Paul Werkowski wrote on cmucl-imp@cons.org 2000-11-15
+ I am looking into this problem that showed up on the cmucl-help
+ list. It seems to me that the "implementation specific environment
+ hacking functions" found in pcl/walker.lisp are completely messed
+ up. The good thing is that they appear to be barely used within
+ PCL and the munged environment object is passed to cmucl only
+ in calls to macroexpand-1, which is probably why this case fails.
+ SBCL uses essentially the same code, so if the environment hacking
+ is screwed up, it affects us too.
+
+64:
+ Using the pretty-printer from the command prompt gives funny
+ results, apparently because the pretty-printer doesn't know
+ about user's command input, including the user's carriage return
+ that the user, and therefore the pretty-printer thinks that
+ the new output block should start indented 2 or more characters
+ rightward of the correct location.
+
+65:
+ (probably related to bug #70)
+ As reported by Carl Witty on submit@bugs.debian.org 1999-05-08,
+ compiling this file
+(in-package "CL-USER")
+(defun equal-terms (termx termy)
+ (labels
+ ((alpha-equal-bound-term-lists (listx listy)
+ (or (and (null listx) (null listy))
+ (and listx listy
+ (let ((bindings-x (bindings-of-bound-term (car listx)))
+ (bindings-y (bindings-of-bound-term (car listy))))
+ (if (and (null bindings-x) (null bindings-y))
+ (alpha-equal-terms (term-of-bound-term (car listx))
+ (term-of-bound-term (car listy)))
+ (and (= (length bindings-x) (length bindings-y))
+ (prog2
+ (enter-binding-pairs (bindings-of-bound-term (car listx))
+ (bindings-of-bound-term (car listy)))
+ (alpha-equal-terms (term-of-bound-term (car listx))
+ (term-of-bound-term (car listy)))
+ (exit-binding-pairs (bindings-of-bound-term (car listx))
+ (bindings-of-bound-term (car listy)))))))
+ (alpha-equal-bound-term-lists (cdr listx) (cdr listy)))))
+
+ (alpha-equal-terms (termx termy)
+ (if (and (variable-p termx)
+ (variable-p termy))
+ (equal-bindings (id-of-variable-term termx)
+ (id-of-variable-term termy))
+ (and (equal-operators-p (operator-of-term termx) (operator-of-term termy))
+ (alpha-equal-bound-term-lists (bound-terms-of-term termx)
+ (bound-terms-of-term termy))))))
+
+ (or (eq termx termy)
+ (and termx termy
+ (with-variable-invocation (alpha-equal-terms termx termy))))))
+ causes an assertion failure
+ The assertion (EQ (C::LAMBDA-TAIL-SET C::CALLER)
+ (C::LAMBDA-TAIL-SET (C::LAMBDA-HOME C::CALLEE))) failed.
+
+ Bob Rogers reports (1999-07-28 on cmucl-imp@cons.org) a smaller test
+ case with the same problem:
+(defun parse-fssp-alignment ()
+ ;; Given an FSSP alignment file named by the argument . . .
+ (labels ((get-fssp-char ()
+ (get-fssp-char))
+ (read-fssp-char ()
+ (get-fssp-char)))
+ ;; Stub body, enough to tickle the bug.
+ (list (read-fssp-char)
+ (read-fssp-char))))
+
+66:
+ ANSI specifies that the RESULT-TYPE argument of CONCATENATE must be
+ a subtype of SEQUENCE, but CONCATENATE doesn't check this properly:
+ (CONCATENATE 'SIMPLE-ARRAY #(1 2) '(3)) => #(1 2 3)
+ This also leads to funny behavior when derived type specifiers
+ are used, as originally reported by Milan Zamazal for CMU CL (on the
+ Debian bugs mailing list (?) 2000-02-27), then reported by Martin
+ Atzmueller for SBCL (2000-10-01 on sbcl-devel@lists.sourceforge.net):
+ (DEFTYPE FOO () 'SIMPLE-ARRAY)
+ (CONCATENATE 'FOO #(1 2) '(3))
+ => #<ARRAY-TYPE SIMPLE-ARRAY> is a bad type specifier for
+ sequence functions.
+ The derived type specifier FOO should act the same way as the
+ built-in type SIMPLE-ARRAY here, but it doesn't. That problem
+ doesn't seem to exist for sequence types:
+ (DEFTYPE BAR () 'SIMPLE-VECTOR)
+ (CONCATENATE 'BAR #(1 2) '(3)) => #(1 2 3)
+
+67:
+ As reported by Winton Davies on a CMU CL mailing list 2000-01-10,
+ and reported for SBCL by Martin Atzmueller 2000-10-20: (TRACE GETHASH)
+ crashes SBCL. In general tracing anything which is used in the
+ implementation of TRACE is likely to have the same problem.
+
+68:
+ As reported by Daniel Solaz on cmucl-help@cons.org 2000-11-23,
+ SXHASH returns the same value for all non-STRUCTURE-OBJECT instances,
+ notably including all PCL instances. There's a limit to how much
+ SXHASH can do to return unique values for instances, but at least
+ it should probably look at the class name, the way that it does
+ for STRUCTURE-OBJECTs.
+
+69:
+ As reported by Martin Atzmueller on the sbcl-devel list 2000-11-22,
+ > There remains one issue, that is a bug in SBCL:
+ > According to my interpretation of the spec, the ":" and "@" modifiers
+ > should appear _after_ the comma-seperated arguments.
+ > Well, SBCL (and CMUCL for that matter) accept
+ > (ASSERT (STRING= (FORMAT NIL "~:8D" 1) " 1"))
+ > where the correct way (IMHO) should be
+ > (ASSERT (STRING= (FORMAT NIL "~8:D" 1) " 1"))
+ Probably SBCL should stop accepting the "~:8D"-style format arguments,
+ or at least issue a warning.
+
+70:
+ (probably related to bug #65)
+ The compiler doesn't like &OPTIONAL arguments in LABELS and FLET
+ forms. E.g.
+ (DEFUN FIND-BEFORE (ITEM SEQUENCE &KEY (TEST #'EQL))
+ (LABELS ((FIND-ITEM (OBJ SEQ TEST &OPTIONAL (VAL NIL))
+ (LET ((ITEM (FIRST SEQ)))
+ (COND ((NULL SEQ)
+ (VALUES NIL NIL))
+ ((FUNCALL TEST OBJ ITEM)
+ (VALUES VAL SEQ))
+ (T
+ (FIND-ITEM OBJ (REST SEQ) TEST (NCONC VAL `(,ITEM))))))))
+ (FIND-ITEM ITEM SEQUENCE TEST)))
+ from David Young's bug report on cmucl-help@cons.org 30 Nov 2000
+ causes sbcl-0.6.9 to fail with
+ error in function SB-KERNEL:ASSERT-ERROR:
+ The assertion (EQ (SB-C::LAMBDA-TAIL-SET SB-C::CALLER)
+ (SB-C::LAMBDA-TAIL-SET
+ (SB-C::LAMBDA-HOME SB-C::CALLEE))) failed.
+
+71:
+ (DECLAIM (OPTIMIZE ..)) doesn't work. E.g. even after
+ (DECLAIM (OPTIMIZE (SPEED 3))), things are still optimized with
+ the previous SPEED policy. This bug will probably get fixed in
+ 0.6.9.x in a general cleanup of optimization policy.
+
+72:
+ (DECLAIM (OPTIMIZE ..)) doesn't work properly inside LOCALLY forms.
+
+74:
+ As noted in the ANSI specification for COERCE, (COERCE 3 'COMPLEX)
+ gives a result which isn't COMPLEX. The result type optimizer
+ for COERCE doesn't know this, perhaps because it was written before
+ ANSI threw this curveball: the optimizer thinks that COERCE always
+ returns a result of the specified type. Thus while the interpreted
+ function
+ (DEFUN TRICKY (X) (TYPEP (COERCE X 'COMPLEX) 'COMPLEX))
+ returns the correct result,
+ (TRICKY 3) => NIL
+ the compiled function
+ (COMPILE 'TRICKY)
+ does not:
+ (TRICKY 3) => T
+
+75:
+ As reported by Martin Atzmueller on sbcl-devel 26 Dec 2000,
+ ANSI says that WITH-OUTPUT-TO-STRING should have a keyword
+ :ELEMENT-TYPE, but in sbcl-0.6.9 this is not defined for
+ WITH-OUTPUT-TO-STRING.
+
+78:
+ ANSI says in one place that type declarations can be abbreviated even
+ when the type name is not a symbol, e.g.
+ (DECLAIM ((VECTOR T) *FOOVECTOR*))
+ SBCL doesn't support this. But ANSI says in another place that this
+ isn't allowed. So it's not clear this is a bug after all. (See the
+ e-mail on cmucl-help@cons.org on 2001-01-16 and 2001-01-17 from WHN
+ and Pierre Mai.)
+
+79:
+ as pointed out by Dan Barlow on sbcl-devel 2000-07-02:
+ The PICK-TEMPORARY-FILE-NAME utility used by LOAD-FOREIGN uses
+ an easily guessable temporary filename in a way which might open
+ applications using LOAD-FOREIGN to hijacking by malicious users
+ on the same machine. Incantations for doing this safely are
+ floating around the net in various "how to write secure programs
+ despite Unix" documents, and it would be good to (1) fix this in
+ LOAD-FOREIGN, and (2) hunt for any other code which uses temporary
+ files and make it share the same new safe logic.
+
+80:
+ (fixed early Feb 2001 by MNA)
+
+81:
+ As reported by wbuss@TELDA.NET (Wolfhard Buss) on cmucl-help
+ 2001-02-14,
+ According to CLHS
+ (loop with (a . b) of-type float = '(0.0 . 1.0)
+ and (c . d) of-type float = '(2.0 . 3.0)
+ return (list a b c d))
+ should evaluate to (0.0 1.0 2.0 3.0). cmucl-18c disagrees and
+ invokes the debugger: "B is not of type list".
+ SBCL does the same thing.
+
+82:
+ Functions are assigned names based on the context in which they're
+ defined. This is less than ideal for the functions which are
+ used to implement CLOS methods. E.g. the output of
+ (DESCRIBE 'PRINT-OBJECT) lists functions like
+ #<FUNCTION "DEF!STRUCT (TRACE-INFO (:MAKE-LOAD-FORM-FUN SB-KERNEL:JUST-DUMP-IT-NORMALLY) (:PRINT-OBJECT #))" {1020E49}>
+ and
+ #<FUNCTION "MACROLET ((FORCE-DELAYED-DEF!METHODS NIL #))" {1242871}>
+ It would be better if these functions' names always identified
+ them as methods, and identified their generic functions and
+ specializers.
+
+83:
+ RANDOM-INTEGER-EXTRA-BITS=10 may not be large enough for the RANDOM
+ RNG to be high quality near RANDOM-FIXNUM-MAX; it looks as though
+ the mean of the distribution can be systematically O(0.1%) wrong.
+ Just increasing R-I-E-B is probably not a good solution, since
+ it would decrease efficiency more than is probably necessary. Perhaps
+ using some sort of accept/reject method would be better.
+
+84:
+ (SUBTYPEP '(SATISFIES SOME-UNDEFINED-FUN) NIL)=>NIL,T (should be NIL,NIL)
+
+85:
+ Internally the compiler sometimes evaluates
+ (sb-kernel:type/= (specifier-type '*) (specifier-type t))
+ (I stumbled across this when I added an
+ (assert (not (eq type1 *wild-type*)))
+ in the NAMED :SIMPLE-= type method.) '* isn't really a type, and
+ in a type context should probably be translated to T, and so it's
+ probably to ask whether it's equal to the T type and then (using the
+ EQ type comparison in the NAMED :SIMPLE-= type method) return NIL.
+ (I haven't tried to investigate this bug enough to guess whether
+ there might be any user-level symptoms.)
+
+90:
+ a latent cross-compilation/bootstrapping bug: The cross-compilation
+ host's CL:CHAR-CODE-LIMIT is used in target code in readtable.lisp
+ and possibly elsewhere. Instead, we should use the target system's
+ CHAR-CODE-LIMIT. This will probably cause problems if we try to
+ bootstrap on a system which uses a different value of CHAR-CODE-LIMIT
+ than SBCL does.
+
+91:
+ (subtypep '(or (integer -1 1)
+ unsigned-byte)
+ '(or (rational -1 7)
+ unsigned-byte
+ (integer -1 1))) => NIL,T
+ An analogous problem with SINGLE-FLOAT and REAL types was fixed in
+ sbcl-0.6.11.22, but some peculiarites of the RATIO type make it
+ awkward to generalize the fix to INTEGER and RATIONAL. It's not
+ clear what's the best fix. (See the "bug in type handling" discussion
+ on cmucl-imp ca. 2001-03-22 and ca. 2001-02-12.)
+
+93:
+ In sbcl-0.6.11.26, (COMPILE 'IN-HOST-COMPILATION-MODE) in
+ src/cold/shared.lisp doesn't correctly translate the
+ interpreted function
+ (defun in-host-compilation-mode (fn)
+ (let ((*features* (cons :sb-xc-host *features*))
+ ;; the CROSS-FLOAT-INFINITY-KLUDGE, as documented in
+ ;; base-target-features.lisp-expr:
+ (*shebang-features* (set-difference *shebang-features*
+ '(:sb-propagate-float-type
+ :sb-propagate-fun-type))))
+ (with-additional-nickname ("SB-XC" "SB!XC")
+ (funcall fn))))
+ No error is reported by the compiler, but when the function is executed,
+ it causes an error
+ TYPE-ERROR in SB-KERNEL::OBJECT-NOT-TYPE-ERROR-HANDLER:
+ (:LINUX :X86 :IEEE-FLOATING-POINT :SB-CONSTRAIN-FLOAT-TYPE :SB-TEST
+ :SB-INTERPRETER :SB-DOC :UNIX ...) is not of type SYMBOL.
+
+94a:
+ Inconsistencies between derived and declared VALUES return types for
+ DEFUN aren't checked very well. E.g. the logic which successfully
+ catches problems like
+ (declaim (ftype (function (fixnum) float) foo))
+ (defun foo (x)
+ (declare (type integer x))
+ (values x)) ; wrong return type, detected, gives warning, good!
+ fails to catch
+ (declaim (ftype (function (t) (values t t)) bar))
+ (defun bar (x)
+ (values x)) ; wrong number of return values, no warning, bad!
+ The cause of this is seems to be that (1) the internal function
+ VALUES-TYPES-EQUAL-OR-INTERSECT used to make the check handles its
+ arguments symmetrically, and (2) when the type checking code was
+ written back when when SBCL's code was still CMU CL, the intent
+ was that this case
+ (declaim (ftype (function (t) t) bar))
+ (defun bar (x)
+ (values x x)) ; wrong number of return values; should give warning?
+ not be warned for, because a two-valued return value is considered
+ to be compatible with callers who expects a single value to be
+ returned. That intent is probably not appropriate for modern ANSI
+ Common Lisp, but fixing this might be complicated because of other
+ divergences between auld-style and new-style handling of
+ multiple-VALUES types. (Some issues related to this were discussed
+ on cmucl-imp at some length sometime in 2000.)
+
+95:
+ The facility for dumping a running Lisp image to disk gets confused
+ when run without the PURIFY option, and creates an unnecessarily large
+ core file (apparently representing memory usage up to the previous
+ high-water mark). Moreover, when the file is loaded, it confuses the
+ GC, so that thereafter memory usage can never be reduced below that
+ level.
+
+96:
+ The TRACE facility can't be used on some kinds of functions.
+ (Basically, the breakpoint facility was incompletely implemented
+ in the X86 port of CMU CL, and hasn't been fixed in SBCL.)
+
+98:
+ In sbcl-0.6.11.41 (and in all earlier SBCL, and in CMU
+ CL), out-of-line structure slot setters are horribly inefficient
+ whenever the type of the slot is declared, because out-of-line
+ structure slot setters are implemented as closures to save space,
+ so the compiler doesn't compile the type test into code, but
+ instead just saves the type in a lexical closure and interprets it
+ at runtime.
+ A proper solution involves deciding whether it's really worth
+ saving space by implementing structure slot accessors as closures.
+ (If it's not worth it, the problem vanishes automatically. If it
+ is worth it, there are hacks we could use to force type tests to
+ be compiled anyway, and even shared. E.g. we could implement
+ an EQUAL hash table mapping from types to compiled type tests,
+ and save the appropriate compiled type test as part of each lexical
+ closure; or we could make the lexical closures be placeholders
+ which overwrite their old definition as a lexical closure with
+ a new compiled definition the first time that they're called.)
+ As a workaround for the problem, #'(SETF FOO) expressions can
+ be replaced with (EFFICIENT-SETF-FUNCTION FOO), where
+(defmacro efficient-setf-function (place-function-name)
+ (or #+sbcl (and (sb-impl::info :function :accessor-for place-function-name)
+ ;; a workaround for the problem, encouraging the
+ ;; inline expansion of the structure accessor, so
+ ;; that the compiler can optimize its type test
+ (let ((new-value (gensym "NEW-VALUE-"))
+ (structure-value (gensym "STRUCTURE-VALUE-")))
+ `(lambda (,new-value ,structure-value)
+ (setf (,place-function-name ,structure-value)
+ ,new-value))))
+ ;; no problem, can just use the ordinary expansion
+ `(function (setf ,place-function-name))))
+
+99:
+ DESCRIBE interacts poorly with *PRINT-CIRCLE*, e.g. the output from
+ (let ((*print-circle* t)) (describe (make-hash-table)))
+ is weird,
+ #<HASH-TABLE :TEST EQL :COUNT 0 {90BBFC5}> is an . (EQL)
+ Its SIZE is 16.
+ Its REHASH-SIZE is 1.5. Its REHASH-THRESHOLD is . (1.0)
+ It holds 0 key/value pairs.
+ where the ". (EQL)" and ". (1.0)" substrings are screwups.
+ (This is likely a pretty-printer problem which happens to
+ be exercised by DESCRIBE, not actually a DESCRIBE problem.)
+
+100:
+ There's apparently a bug in CEILING optimization which caused
+ Douglas Crosher to patch the CMU CL version. Martin Atzmueller
+ applied the patches to SBCL and they didn't seem to cause problems
+ (as reported sbcl-devel 2001-05-04). However, since the patches
+ modify nontrivial code which was apparently written incorrectly
+ the first time around, until regression tests are written I'm not
+ comfortable merging the patches in the CVS version of SBCL.
+
+
+KNOWN BUGS RELATED TO THE IR1 INTERPRETER
+
+(Note: At some point, the pure interpreter (actually a semi-pure
+interpreter aka "the IR1 interpreter") will probably go away, replaced
+by constructs like
+ (DEFUN EVAL (X) (FUNCALL (COMPILE NIL (LAMBDA ..)))))
+and at that time these bugs should either go away automatically or
+become more tractable to fix. Until then, they'll probably remain,
+since some of them aren't considered urgent, and the rest are too hard
+to fix as long as so many special cases remain. After the IR1
+interpreter goes away is also the preferred time to start
+systematically exterminating cases where debugging functionality
+(backtrace, breakpoint, etc.) breaks down, since getting rid of the
+IR1 interpreter will reduce the number of special cases we need to
+support.)
+
+IR1-1:
+ The FUNCTION special operator doesn't check properly whether its
+ argument is a function name. E.g. (FUNCTION (X Y)) returns a value
+ instead of failing with an error. (Later attempting to funcall the
+ value does cause an error.)
+
+IR1-2:
+ COMPILED-FUNCTION-P bogusly reports T for interpreted functions:
+ * (DEFUN FOO (X) (- 12 X))
+ FOO
+ * (COMPILED-FUNCTION-P #'FOO)
+ T
+
+IR1-3:
+ Executing
+ (DEFVAR *SUPPRESS-P* T)
+ (EVAL '(UNLESS *SUPPRESS-P*
+ (EVAL-WHEN (:COMPILE-TOPLEVEL :LOAD-TOPLEVEL :EXECUTE)
+ (FORMAT T "surprise!"))))
+ prints "surprise!". Probably the entire EVAL-WHEN mechanism ought to be
+ rewritten from scratch to conform to the ANSI definition, abandoning
+ the *ALREADY-EVALED-THIS* hack which is used in sbcl-0.6.8.9 (and
+ in the original CMU CL source, too). This should be easier to do --
+ though still nontrivial -- once the various IR1 interpreter special
+ cases are gone.
+
+IR1-3a:
+ EVAL-WHEN's idea of what's a toplevel form is even more screwed up
+ than the example in IR1-3 would suggest, since COMPILE-FILE and
+ COMPILE both print both "right now!" messages when compiling the
+ following code,
+ (LAMBDA (X)
+ (COND (X
+ (EVAL-WHEN (:COMPILE-TOPLEVEL :LOAD-TOPLEVEL :EXECUTE)
+ (PRINT "yes! right now!"))
+ "yes!")
+ (T
+ (EVAL-WHEN (:COMPILE-TOPLEVEL :LOAD-TOPLEVEL :EXECUTE)
+ (PRINT "no! right now!"))
+ "no!")))
+ and while EVAL doesn't print the "right now!" messages, the first
+ FUNCALL on the value returned by EVAL causes both of them to be printed.
+
+IR1-4:
+ The system accepts DECLAIM in most places where DECLARE would be
+ accepted, without even issuing a warning. ANSI allows this, but since
+ it's fairly easy to mistype DECLAIM instead of DECLARE, and the
+ meaning is rather different, and it's unlikely that the user
+ has a good reason for doing DECLAIM not at top level, it would be
+ good to issue a STYLE-WARNING when this happens. A possible
+ fix would be to issue STYLE-WARNINGs for DECLAIMs not at top level,
+ or perhaps to issue STYLE-WARNINGs for any EVAL-WHEN not at top level.
+ [This is considered an IR1-interpreter-related bug because until
+ EVAL-WHEN is rewritten, which won't happen until after the IR1
+ interpreter is gone, the system's notion of what's a top-level form
+ and what's not will remain too confused to fix this problem.]
projects / sbcl.git / blobdiff