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:
+3: "type checking of structure slots"
a:
ANSI specifies that a type mismatch in a structure slot
initialization value should not cause a warning.
an error may be signalled at read time and it would be good if
SBCL did it.
-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. 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.
-
- As of sbcl-0.7.5, sbcl's cross-compiler does run with
- *TYPE-SYSTEM-INITIALIZED*; however, this bug remains.
+ c: Reading of not initialized slot sometimes causes SEGV.
+
+ d:
+ (declaim (optimize (safety 3) (speed 1) (space 1)))
+ (defstruct foo
+ x y)
+ (defstruct (stringwise-foo (:include foo
+ (x "x" :type simple-string)
+ (y "y" :type simple-string))))
+ (defparameter *stringwise-foo*
+ (make-stringwise-foo))
+ (setf (foo-x *stringwise-foo*) 0)
+ (defun frob-stringwise-foo (sf)
+ (aref (stringwise-foo-x sf) 0))
+ (frob-stringwise-foo *stringwise-foo*)
+ SEGV.
7:
The "compiling top-level form:" output ought to be condensed.
(defmethod zut ((c ccc1)) 123)
In sbcl-0.7.1.13, this gives an error,
There is no class named CCC1.
- DTC's recommended workaround from the mailing list 3 Mar 2000:
- (setf (pcl::find-class 'ccc1) (pcl::find-class 'ccc))
+ In sbcl-0.pre8.20, this works, but prints style warnings about
+ undefined types.
27:
Sometimes (SB-EXT:QUIT) fails with
45:
a slew of floating-point-related errors reported by Peter Van Eynde
on July 25, 2000:
- b: SBCL's value for LEAST-POSITIVE-SHORT-FLOAT is bogus, and
- should probably be 1.4012985e-45. In SBCL,
+ b: SBCL's value for LEAST-POSITIVE-SHORT-FLOAT on the x86 is
+ bogus, and should probably be 1.4012985e-45. In SBCL,
(/ LEAST-POSITIVE-SHORT-FLOAT 2) returns a number smaller
than LEAST-POSITIVE-SHORT-FLOAT. Similar problems
exist for LEAST-NEGATIVE-SHORT-FLOAT, LEAST-POSITIVE-LONG-FLOAT,
(ADD-METHOD (FUNCTION FOO03) M)))
should give an error, but SBCL allows it.
-52:
- It has been reported (e.g. by Peter Van Eynde) that there are
- several metaobject protocol "errors". (In order to fix them, we might
- need to document exactly what metaobject protocol specification
- we're following -- the current code is just inherited from PCL.)
-
60:
The debugger LIST-LOCATIONS command doesn't work properly.
(partially alleviated in sbcl-0.7.9.32 by a fix by Matthew Danish to
make the temporary filename less easily guessable)
-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
(note the space between the comma and the point)
-
143:
(reported by Jesse Bouwman 2001-10-24 through the unfortunately
prominent SourceForge web/db bug tracking system, which is
expansion, leaving garbage consisting of infinished blocks of the
partially converted function.)
-157:
- Functions SUBTYPEP, TYPEP, UPGRADED-ARRAY-ELEMENT-TYPE, and
- UPGRADED-COMPLEX-PART-TYPE should have an optional environment argument.
- (reported by Alexey Dejneka sbcl-devel 2002-04-12)
+ (due to reordering of the compiler this example is compiled
+ successfully by 0.7.14, but the bug probably remains)
162:
(reported by Robert E. Brown 2002-04-16)
would be to put the check between evaluation of arguments, but it
could be tricky to check result types of PROG1, IF etc.
-228: "function-lambda-expression problems"
- in sbcl-0.7.9.6x, from the REPL:
- * (progn (declaim (inline foo)) (defun foo (x) x))
- FOO
- * (function-lambda-expression #'foo)
- (SB-C:LAMBDA-WITH-LEXENV NIL NIL NIL (X) (BLOCK FOO X)), NIL, FOO
- but this first return value is not suitable for input to FUNCTION or
- COMPILE, as required by ANSI.
-
229:
(subtypep 'function '(function)) => nil, t.
(foo 4) => segmentation violation
(see usage of CONTINUATION-ASSERTED-TYPE in USE-RESULT-CONSTRAINTS)
+ (see also bug 236)
b.
(declaim (optimize (speed 2) (safety 3)))
(+ x 2)))
(foo 1d0 5) => segmentation violation
-234:
- (fixed in sbcl-0.7.10.36)
+235: "type system and inline expansion"
+ a.
+ (declaim (ftype (function (cons) number) acc))
+ (declaim (inline acc))
+ (defun acc (c)
+ (the number (car c)))
+
+ (defun foo (x y)
+ (values (locally (declare (optimize (safety 0)))
+ (acc x))
+ (locally (declare (optimize (safety 3)))
+ (acc y))))
+
+ (foo '(nil) '(t)) => NIL, T.
+
+ b. (reported by brown on #lisp 2003-01-21)
+
+ (defun find-it (x)
+ (declare (optimize (speed 3) (safety 0)))
+ (declare (notinline mapcar))
+ (let ((z (mapcar #'car x)))
+ (find 'foobar z)))
+
+ Without (DECLARE (NOTINLINE MAPCAR)), Python cannot derive that Z is
+ LIST.
+
+236: "THE semantics is broken"
+
+ (defun foo (a f)
+ (declare (optimize (speed 2) (safety 0)))
+ (+ 1d0
+ (the double-float
+ (multiple-value-prog1
+ (svref a 0)
+ (unless f (return-from foo 0))))))
+
+ (foo #(4) nil) => SEGV
+
+ VOP selection thinks that in unsafe code result type assertions
+ should be valid immediately. (See also bug 233a.)
+
+ The similar problem exists for TRULY-THE.
+
+237: "Environment arguments to type functions"
+ a. Functions SUBTYPEP, TYPEP, UPGRADED-ARRAY-ELEMENT-TYPE, and
+ UPGRADED-COMPLEX-PART-TYPE now have an optional environment
+ argument, but they ignore it completely. This is almost
+ certainly not correct.
+ b. Also, the compiler's optimizers for TYPEP have not been informed
+ about the new argument; consequently, they will not transform
+ calls of the form (TYPEP 1 'INTEGER NIL), even though this is
+ just as optimizeable as (TYPEP 1 'INTEGER).
+
+238: "REPL compiler overenthusiasm for CLOS code"
+ From the REPL,
+ * (defclass foo () ())
+ * (defmethod bar ((x foo) (foo foo)) (call-next-method))
+ causes approximately 100 lines of code deletion notes. Some
+ discussion on this issue happened under the title 'Three "interesting"
+ bugs in PCL', resulting in a fix for this oververbosity from the
+ compiler proper; however, the problem persists in the interactor
+ because the notion of original source is not preserved: for the
+ compiler, the original source of the above expression is (DEFMETHOD
+ BAR ((X FOO) (FOO FOO)) (CALL-NEXT-METHOD)), while by the time the
+ compiler gets its hands on the code needing compilation from the REPL,
+ it has been macroexpanded several times.
+
+241: "DEFCLASS mysteriously remembers uninterned accessor names."
+ (from tonyms on #lisp IRC 2003-02-25)
+ In sbcl-0.7.12.55, typing
+ (defclass foo () ((bar :accessor foo-bar)))
+ (profile foo-bar)
+ (unintern 'foo-bar)
+ (defclass foo () ((bar :accessor foo-bar)))
+ gives the error message
+ "#:FOO-BAR already names an ordinary function or a macro."
+ So it's somehow checking the uninterned old accessor name instead
+ of the new requested accessor name, which seems broken to me (WHN).
+
+242: "WRITE-SEQUENCE suboptimality"
+ (observed from clx performance)
+ In sbcl-0.7.13, WRITE-SEQUENCE of a sequence of type
+ (SIMPLE-ARRAY (UNSIGNED-BYTE 8) (*)) on a stream with element-type
+ (UNSIGNED-BYTE 8) will write to the stream one byte at a time,
+ rather than writing the sequence in one go, leading to severe
+ performance degradation.
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