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Update notes for ANSI fixes.
1 ========================== C M U C L 19 a =============================
5 The CMUCL project is pleased to announce the release of CMUCL 19a.
6 This is a major release which contains numerous enhancements and
7 bugfixes from the 18e release.
9 CMUCL is a free, high performance implementation of the Common Lisp
10 programming language which runs on most major Unix platforms. It
11 mainly conforms to the ANSI Common Lisp standard. CMUCL provides a
12 sophisticated native code compiler; a powerful foreign function
13 interface; an implementation of CLOS, the Common Lisp Object System,
14 which includes multimethods and a metaobject protocol; a source-level
15 debugger and code profiler; and an Emacs-like editor implemented in
16 Common Lisp. CMUCL is maintained by a team of volunteers collaborating
17 over the Internet, and is mostly in the public domain.
19 New in this release:
21 * Feature enhancements:
22 - Stack overflow checking added for FreeBSD/x86, Linux/x86 and
23 Solaris. Code that makes the control stack overflow (for
24 example due to unbounded recursion) will lead to a
25 STORAGE-ERROR being signaled, instead of making CMUCL crash.
26 - LISP:FIND-CLASS and LISP:CLASS-OF now return CLOS classes. The
28 LISP:STRUCTURE-CLASS name CLOS classes. It is no longer
29 necessary to SHADOWING-IMPORT these from PCL when doing MOP
30 programming, and it fixes some non-compliances as well.
31 - Package locks: a package whose EXT:PACKAGE-LOCK is enabled
32 non-NIL is protected against changes in its structure (list of
33 exported symbols, use-list etc). Symbols in a package whose
34 EXT:PACKAGE-DEFINITION-LOCK is enabled are protected against
35 redefinition.
36 - Weak hash tables have been added for x86 systems.
37 - Local functions are now named (FLET <name> ...) or
38 (LABELS <name> ...).
39 - Compiler checking control string and number of args to FORMAT,
40 ERROR and WARN.
41 - TRACE automatically using encapsulation when function-end
42 breakpoints cannot be used.
43 - INSPECT working on CLOS instances.
44 - Callbacks from foreign code to Lisp. Implemented for x86 and
45 sparc.
46 - Functions like GETHASH that are used in the implementation of
47 TRACE can now be traced. See also
49 - New facility for encapsulating functions, FWRAPPERS;
50 see also the CMUCL User Manual.
51 - TRACE and PROFILE have been reimplemented using fwrappers,
52 with the effect of tracing and profiling now working more
53 nicely together.
54 - When a profiled function is redefined, it is re-profiled.
55 - A basic implementation of simple-streams added. Some
56 functionality may be missing.
57 - UNIX:UNIX-LSEEK working with files > 2G on BSDs.
58 - Type declarations on local bindings of special variables no
59 longer being ignored.
60 - DISASSEMBLE disassembling closure/funcallable instance
61 functions.
62 - (SETF EXT:WEAK-POINTER-VALUE) has been added.
63 - CMUCL no longer entering an infinite loop when dumping
64 circular constant lists to fasl files.
65 - COMPILE-FILE-PATHNAME's BYTE-COMPILE keyword arg defaulting
67 - Added VOPs for CHAR=, CHAR<, and CHAR> when the second arg is a
68 constant character.
69 - Added missing VOPs for Sparc for array refs with a constant
70 index.
71 - Lisp binary will also look at the PATH envvar to find out it's
72 own location which is used to find other needed files.
73 - Byte-compiled code being executed ca. 1/3 faster.
74 - Heap overflow checking for x86 and solaris with gencgc. When
75 the heap is close to overflowing, a heap-overflow condition is
76 signaled. If an overflow happens again while debugging the
77 condition, the user is returned to top-level without warning.
78 Use lisp::*reserved-heap-pages* to set the number of pages to
79 reserve.
80 - C functions are displayed in backtraces now for x86/linux and
81 sparc. Previously, it just said "Foreign function call land".
82 (From Helmut Eller.)
83 - Source location recording is done better and handles macros
84 including things defined by defclass, defvar, and defgeneric.
85 From Helmut Eller.
86 - Modular arithmetic implemented for x86 and sparc. So
88 (ldb (byte 32 0) (+ x y))
90 is a simple machine add instruction if x and y are
91 (unsigned-byte 32).
93 * Numerous ANSI compliance fixes:
94 - Many bugs in CMUCL's type system detected by Paul Dietz'
95 ANSI test suite have been fixed.
96 - Non-keyword keyword names in lambda lists are now accepted.
97 - Condition slot initialization fixed for the case that two
98 or more slots have the same :INITARG.
99 - Initforms are now evaluated once only during condition slot
100 initialization.
101 - USE-VALUE, STORE-VALUE, CONTINUE behavior corrected in presence
102 of multiple restarts having the same name.
103 - RESTART-CASE's interaction with local macros fixed.
104 - Interaction of COMPUTE-RESTARTS and RESTART-CASE fixed in
105 presence of multiple restarts having the same name.
106 - Condition slot readers/writers are generic functions.
107 - &WHOLE, &REST, &BODY in macro lambda lists can be followed
108 by destructuring patterns. The previous behavior of &BODY
109 when followed by (<body> <declarations> <doc>) is available
110 through the new lambda-list keyword EXT:&PARSE-BODY.
111 - ELT now signals an error in safe code when used on lists
112 with an out-of-bounds index.
113 - Accessing arrays in compiled code with out-of-bounds indices
114 now signals a TYPE-ERROR.
115 - DECLARE no longer being a special operator.
116 - DEFINE-CONDITION accepts slot option :DOCUMENTATION.
117 - Behavior of (... &KEY &ALLOW-OTHER-KEYS) fixed for
118 DESTRUCTURING-BIND and macros.
119 - Stricter checking of keyword argument list in CLOS methods.
120 - &ENVIRONMENT variable bound bound before other vars, regardless
121 of where it appears in a lambda-list.
122 - VALUES types no longer accepting &KEY or &ALLOW-OTHER-KEYS.
123 - THE conforming to ANSI.
124 - SLOT-EXISTS-P can be used with conditions.
125 - REMOVE-METHOD always returning the generic function passed to it.
126 - Standard methods for STANDARD-OBJECT and STRUCTURE-OBJECT
127 defined on MAKE-LOAD-FORM.
129 - DEFSTRUCT recording slot-names as specified by users.
130 - Generic function call keyword argument checking according to
131 ANSI 7.6.5.
132 - CALL-NEXT-METHOD without arguments being called with original
133 arguments when method parameters are changed with SETQ.
134 - When CALL-NEXT-METHOD is called with arguments, an error is
135 signaled in safe code when the set of methods applicable to
136 CALL-NEXT-METHOD's arguments is different from the set of
137 methods applicable to the original method arguments.
138 - FIND-METHOD signaling an error when called with specializers
139 not corresponding to the number of required arguments of the
140 supplied generic function.
141 - TYPE-OF returning KEYWORD for keywords, STANDARD-CHAR for
142 standard characters, BOOLEAN for T, (INTEGER <N> <N>) for
143 integers N, non-list types for functions, and CLOS classes for
144 instances whose class doesn't have a proper name.
145 - Class precedence list of NULL not having SYMBOL before LIST,
146 precedence list of STANDARD-METHOD not having METHOD before
148 - ADD-METHOD returning its first argument, the generic function.
149 - DEFCLASS redefining a class with the given name only if the
150 name is the proper name of an existing class.
151 - KEYWORD package no longer having nickname "".
152 - COMMON-LISP-USER package no longer having nickname USER.
153 - COMMON-LISP package no longer having nickname LISP; LISP
154 and COMMON-LISP are now separate packages.
156 returning values specified by the standard when SLOT-UNBOUND
157 or SLOT-MISSING are called and return.
158 - NTH and NTHCDR accepting bignums as first argument.
159 - First arg of CERROR may be a function.
160 - Lambda-lists of the form (X . Y) in DESTRUCTURING-BIND and macros
161 are now equivalent to (X &REST Y).
162 - LAST, BUTLAST, NBUTLAST accepting bignum counts.
164 - FIXNUM no longer naming a function.
166 - Numerous LOOP fixes.
167 - On FreeBSD, CLtS-required floating-point conditions are signaled.
168 - The minimum rehash-threshold is 0.1, and is enforced silently.
169 This is to prevent overflows and divide-by-zero errors when
170 creating a hash-table with a too-small rehash-threshold.
171 - MACROLET now accepts declarations, as prescribed by ANSI CL.
172 - MAKE-PATHNAME signals an error on invalid combinations
173 (:absolute or :wild-inferiors followed by :back or :up).
174 - PEEK-CHAR skips whitespace based on the readtable instead of
175 using hard-wired values.
176 - PEEK-CHAR signals an end-of-file error if necessary when
177 RECURSIVE-P is true.
178 - FILE-LENGTH now signals a TYPE-ERROR when the stream is not a
179 stream associated with a file.
180 - Floats are now printed and read accurately, preserving
181 read/print consistency. (Was sometimes off by a bit in the
182 least significant bit.)
183 - Printing of rationals should generate correct results now for
184 all cases of *print-base* and *print-radix*.
185 - Symbol printer should print better with unusual settings of
186 *print-case* and friends.
188 * Numerous bugfixes:
189 - NSET-EXCLUSIVE-OR returns the same results as SET-EXCLUSIVE-OR
190 wrt to duplicate elements.
191 - Forms like (MULTIPLE-VALUE-BIND 'LIST) no longer trapping
192 an internal compiler error when compiled.
194 - Compiler eliminating some type checks in safe code.
195 - Byte-compiler and -interpreter not handling C:&MORE.
196 - Some TYPE-ERRORs being signaled with unbound slots, which
197 made them undisplayable.
198 - Structure predicates no longer signaling an error when applied
199 to obsolete instances.
200 - A DEFTRANSFORM for array bounds checking had an off-by-1 error.
201 - Compiler was not properly deriving the type of FTRUNCATE in all
202 cases.
203 - Fixed error wherein certain uses of 2 arg ATAN caused a
204 compiler error on x86.
205 - Compiler wrongly signaling a type error in VOLATILE-INFO-LOOKUP or
206 COMPACT-INFO-LOOKUP for hash values equal to MOST-POSITIVE-FIXNUM.
207 - FFLOOR and FCEILING return types sometimes being inferred as
208 being the nil type.
209 - PARSE-TIME accepting GMT offsets with a leading plus sign.
210 - UNIX-MMAP not accepting a null fd, preventing anonymous
211 mappings.
212 - SIGPROF having the wrong value on GNU/Linux.
213 - Wrong byte-code being generated for (APPLY #'+ <X> <Y>) and
214 similar cases.
215 - GCD sometimes returning a negative value.
216 - LCM sometimes returning a negative value, or signaling division-by-zero.
217 - FLOAT sometimes returning a float of the wrong type.
218 - ROOM should handle the large heaps now without overflowing
219 internal counters or signaling type errors. Columns should
220 line up better too.
221 - READ-SEQUENCE was returning too soon when reading from files
222 into simple-strings even though there were data available.
223 - READ-SEQUENCE was returning the wrong value when reading into
224 simple-strings and when the :START value was not zero.
226 * Other changes:
227 - CREATE-REQUEST-SERVER has an additional :reuse-address keyword
228 argument.
229 - Removed obsolete alias from MAKE-VECTOR to MAKE-ARRAY
230 - the signature of *COMPILER-NOTIFICATION-FUNCTION* has changed;
231 it now has an extra argument that describes the nature of the
232 error or warning.
233 - File versioning occurs when the version component is :NEWEST,
234 and Emacs style file versions are created: foo.bar.~N~, where
235 the larger N is newer. foo.bar is the newest version.
236 - Converting namestrings to pathnames now get a version component
237 of NIL instead of :NEWEST.
238 - *DEFAULT-PATHNAME-DEFAULTS* has a version component of
239 :UNSPECIFIC instead of :NEWEST so versioning is disabled by
240 default to preserve current behavior. Set the version to
241 :NEWEST to create versions.
242 - LDB backtrace on x86.
243 - DYNAMIC-EXTENT support on x86 and sparc. Stack-allocation can
244 be controlled by the setting of
246 Manual. Be warned that all bets are off if a stack-allocated
247 object or parts of it escape; CMUCL might crash or format your
248 hard disk.
249 - Generational GC (gencgc) available for Sparc/Solaris on an
250 experimental basis. Despite the name and feature, it is not
251 conservative.
252 - Search in /usr/lib/cmucl for the lisp core file as well, to
253 support x86/Linux
254 - The trap for floating-point underflow is turned off by default
255 for all platforms now.
256 - A continuable error is signaled when defining a logical
257 pathname host that has the same name as a search-list host.
258 - A better sxhash function for string is implemented on sparc.
259 This is based on the one-at-a-time hash from
260 http://burtleburtle.net/bob/hash/doobs.html.
262 * Numerous improvements to the PCL implementation of CLOS:
263 - Gerd's PCL has been added, which fixes numerous bugs and ANSI/
264 AMOP non-compliances, and adds various new optimizations (also
265 see the CMU User Manual).
266 - PCL's class hierarchy has been changed to conform to AMOP, for
267 instance, GENERIC-FUNCTION is now a subclass of
269 - ENSURE-CLASS-USING-CLASS's argument list has been changed
270 to conform to AMOP.
271 - COMPUTE-EFFECTIVE-SLOT-DEFINITION now takes a slot name as
272 argument, for AMOP compliance.
273 - SUBTYPEP works in presence of forward-referenced classes.
274 - Accessing slots of specialized parameters in (SETF
275 SLOT-VALUE-USING-CLASS) methods works.
277 AMOP compliant.
278 - ALLOCATE-INSTANCE working with structures defined with DEFSTRUCT.
280 (FOO 1) now signals an error.
281 - Methods with &OPTIONAL arguments detecting too many args.
282 - DEFMETHOD and DEFGENERIC detecting doubled lambda variables.
284 - SLOT-VALUE, (SETF SLOT-VALUE), SLOT-BOUNDP working with conditions.
285 - (SETF SLOT-VALUE) working on read-only structure slots like
286 in other implementations.
287 - The declaration identifiers SLOTS, AUTO-COMPILE,
288 NOT-AUTO-COMPILE have been moved from PCL to EXT.
289 - Support for inlineing methods in effective methods; see the
290 CMU User Manual.
291 - Wrong results could be returned from generic functions when
292 all methods returned constant values, and some methods were
293 qualified, or the generic function didn't use the standard
294 method combination.
295 - For standard method combination and method combinations defined
296 with the short form of DEFINE-METHOD-COMBINATION: If there are
297 no applicable primary methods when a generic function is
298 called, the generic function PCL:NO-PRIMARY-METHOD is called.
299 The default method of this generic function signals a
300 continuable error of type PCL:NO-PRIMARY-METHOD-ERROR.
301 - Effective methods are no longer precomputed at method load
302 time, if the generic function has more than
303 PCL:*MAX-EMF-PRECOMPUTATION-METHODS* methods (default 100).
304 - The loading of methods with invalid qualifiers no longer
305 signals an error, for standard's conformance. Instead, a
306 warning is printed at method load time. An error is
307 signaled if the generic function is called with arguments such
308 that the method is used.
309 - Redefining a generic function with a different method
310 combination now recomputes effective methods.
311 - Slot access and gf-call optimizations are no longer performed
312 for method parameters being assigned to in a method body, because
313 we can't tell what type of object the method parameter actually
314 contains.
316 * Improvements to Hemlock, the Emacs-like editor:
318 * Changes to rebuilding procedure:
319 - When rebuilding CMUCL, *features* do not need to be set by
320 hand. As files are loaded, the appropriate *features* are set
321 so that the resulting build has the same set of *features*.
322 There should also be fewer warnings about internals.h changing,
323 since that now just contains things in sys:*runtime-features*.
324 Use sys:register-lisp-feature and
325 sys:register-lisp-runtime-feature to set *features* and
326 sys:*runtime-features*, respectively.
327 - Pierre Mai's build-tools have been incorporated. The scripts
328 are in the src/tools directory. These are slightly modified
329 versions of his scripts. Should make building CMUCL easier.
331 * Deprecated features:
332 - EXT:ENCAPSULATE and associated functions; use fwrappers instead.
333 - The sparc port with the Cheney stop-and-copy garbage collector
334 will no longer be supported after this release. The supported
335 GC will be gencgc.
336 - The sparc port will only be supported on Ultrasparc machines
337 (Sparc V9).
339 This release is not binary compatible with code compiled using CMUCL
340 18e; you will need to recompile FASL files.
342 See <URL:http://www.cons.org/cmucl/> for download information,
343 guidelines on reporting bugs, and mailing list details.
346 We hope you enjoy using this release of CMUCL!

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