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Revision 1.16 - (hide annotations)
Fri Mar 11 14:25:22 1994 UTC (20 years, 1 month ago) by ram
Branch: MAIN
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Update for 17e
1 ram 1.15 Release notes for CMU Common Lisp 17e, 19 September 93
3 ram 1.16 17e is primarily a bug-fix release. This release is also available on
4     Hewlett-Packard 700-series workstations running HP/UX version 9.x.
5     The main missing feature on HP/UX is LOAD-FOREIGN.
6 ram 1.15
10     Enhancements:
11     -- The function EXT:PURIFY is now exported. This was formerly only
12     documented as usable via the :PURIFY argument to SAVE-LISP. Great
13     improvements in GC runtime and memory use can be obtained when PURIFY is
14     called after loading in large amounts of code or creating large
15     datastructures that are unlikely to become garbage.
16     -- EXT:PURIFY (and thus (EXT:SAVE-LISP ... :PURIFY T) now compact the
17     hashtables representing the global namespace. Formerly this feature was
18     undocumented and only used during the initial system build.
19     -- There is now a "runtime" version of the Lisp image which omits the
20     compiler and loads some other code byte compiled, giving a 60% size
21     reduction. See README file, "Runtime distribution" section.
22     -- Changed the byte-function and byte-closure funcallable-instances to use
23     &more args instead of a &rest arg (eliminating the main source of
24     grautitous consing in byte code.)
25     -- Allow pretty-printer to work without compiler loaded.
26     -- Improved (and thus changed) the SXHASH of lists and other composite
27     objects.
28     -- Added to *FEATURES* all of the ANSI CL features that seemed plausible.
29     Any non-ANSI compliance is now a bug, not a feature...
30     -- Picked up Miles' changes to apropos and apropos-list that allows one to
31     supply NIL for the package, meaning all packages.
33     Bug fixes:
34 ram 1.16 -- In SIGNAL, bind *break-on-signals* to NIL even before doing the type test
35     so that we don't wedge the error system if the type is malformed or
36     undefined.
37 ram 1.15 -- Fix arg ordering for GETF in new condition support. Default the name
38     slot in DEFMACRO-LAMBDA-LIST-BIND-ERRORS to NIL (instead of leaving it
39     unbound.)
40     -- In READ-N-BYTES, only signal EOF when we read and got 0 bytes, not
41     whenever read returns less than we wanted. Also, fix the case of small
42     reads with an empty buffer not to leave garbled buffer pointers if we have
43     to do more than one read. These bugs mostly affect the X interface and
44     its users (Garnet was having problems.)
45     -- Changed YES-OR-NO-P and Y-OR-N-P to force output.
46     -- Fixed COUNT :TEST-NOT to actually negate the test.
47     -- Fixed COERCE to call type-expand so that people can coerce to deftypes.
48     -- Rename STEP to DEBUG::SET-STEP-BREAKPOINT because step is supposed to be
49     the exported step macro, not some internal routine.
50     -- Fixed DEFPACKAGE to combine multiple use, export, and import options
51     correctly. Fixed the warning about no longer using some packages to
52     actually work.
53     -- Fixed GCD to correctly handle MOST-NEGATIVE-FIXNUM.
54     -- Flush Hemlock font change hack in default site-init.lisp, since it was
55     causing problems.
57     CLOS (PCL):
58     -- Add some hacks for coercing lisp:class objects to pcl:class.
60     -- Fix some problems with the LISP:CLASS class-precedence-list suddenly
61     becoming empty when a class is redefined.
62     -- Fixed SIMPLE-STRING to list STRING in the inherits list.
63 ram 1.16 -- Fix to update-instance-for-different-class.
64 ram 1.15
66     COMPILER:
68     Enhancements:
69     -- Added a type inference method for LOG's result type.
70     -- Added support for "more args" which are like rest args, but don't cons.
71     This is used for calling into annd out of byte-compiled core and in the
72     PROFILE package.
73     -- Increase *inline-expansion-limit* from 50 to 200. Change "inline
74     expansion count exceeded" warning to be a note. Don't inline expand in
75     interpreted code.
77     Bug fixes:
78 ram 1.16 -- Allow stream arg to compile-file.
79     -- Changed assert-definition-type to quietly ignore non function-types.
80     -- Allow stream arg to compile-file.
81     -- Deleted incorrect type declaration in process-1-ftype-proclamation.
82     Deleted test for function-type-p around call to assert-definition-type,
83     since this is now folded into the function. Previously several calls
84     weren't doing this necessary check.
85 ram 1.15 -- Fix a problem where spurious argument types could be inferred for optional
86     arguments in byte-compiled code (caused yes-or-no-p to fail.)
87     -- Fixed an internal error related to tail local calls.
88     -- Fixed assertion failure about COMPONENT-NEW-FUNCTIONS with some inline
89     expansions.
90     -- Fixed (TYPEP X '(REAL ...)) to actually test against REAL, not NUMBER.
91     -- Fixed a problem where top-level MULTIPLE-VALUE-CALL forms could cause an
92     assertion falure.
93     -- Don't try to compile flow-graph components that are unreachable. This
94     avoids some internal errors when unreachable local functions are
95     deleted.
96     -- Fix problem with byte-compiling PROGV getting an internal compiler error.
101     Misc extensions:
102     -- Added an executable-only optional to EXT:UNIX-NAMESTRING so that we can
103     expand path:foo into the first executable in the path named foo, not just
104     the first file
105     -- Changed RUN-PROGRAM to only try to run executables, and to flame out if it
106     can't be found in path:.
107     -- Profile: use &more instead of &rest to avoid consing the &rest arg list.
108     Fixed PROFILE:REPORT-TIME to not choke if any of the function names are
109     not symbols (e.g. setf functions).
111 ram 1.16 [NOTE: Motif server doesn't work on HP yet.]
112 ram 1.15 Motif interface:
113     -- Added an optional STYLE arg to the graphical inspector to make the
114     function consistent with its doc string (as well as the old inspector).
115     -- Tried to make starting the Motif server more robust, or at least give some
116     intelligible error message.
117     -- Added some extra protection against recursive invocation of the windowing
118     debugger.
119 ram 1.16 -- Don't try to invoke motif debugger if we didn't succeed in opening a
120     connection.
121     -- Print warning in status hook when server dies.
122     -- Made server fflush after all output so that we see output when it is run
123     on a pipe.
124 ram 1.15
125     Hemlock:
126     -- Add window-buffer-hook for echo area buffer to make absolutely sure we
127     can't change the eacho area window to point to another buffer.
128     -- Give a sensible error message if we can't find the slave utility (e.g.
129     lisp) to run.
130     -- Restored the behavior of scribe-file to cd to the directory of the .mss
131     file before running scribe.
132     -- Change default fonts to be courier, flushing all mention of 8x13.
133     Remove font-setting in default site-init file, since it was causing
134     problems.
135     -- Add FILE-POSITION method for region streams so that the compiler's read
136     error recovery works for "Editor Compile Defun", etc.
137     -- When reading a file, set BUFFER-WRITABLE to T before doing anything so
138     that we don't get spurious read-only errors.
141 ram 1.14 Release notes for CMU Common Lisp 17c, 19 September 93
142 ram 1.12
143 ram 1.14 17c is a new major release of CMU Common Lisp. An overview of changes:
144 ram 1.12 -- New structure object representation and class support in the type system.
145     -- PCL better integrated with CMU type system.
146     -- New CLX, PCL.
147     -- Numerous ANSI changes.
148     -- Byte-code compilation option offers more compact code.
149     -- Improvements in compiler source-level optimization, inline expansion and
150     instruction scheduling.
151     -- New fasl file format (you must recompile.)
152     -- Calling of SETF functions is now efficient.
153     -- Speed and space tuning in the compiler and runtime system.
154     -- New TTY debugger commands support stepping compiled code.
155     -- A graphical debugger and inspector based on a Motif interface.
156     -- Changes in the startup code and SAVE-LISP increase portability.
157 ram 1.14 -- Preliminary support for the HP Precision Architecture under HP-UX 9.0
158     (i.e. for HP 700 series.)
159     -- New User's manual. Note that the online Info document has not been
160     updated yet.
162 ram 1.12 And of course, bug fixes...
164     Basic runtime code changes:
166     ANSI cleanups:
167 ram 1.14 -- These functions are now defined:
173     -- The conditions FLOATING-POINT-INEXACT,
175     defined.
176     -- Logical pathnames are now implemented. (See "pathnames" below and the
177     user's manual.)
178     -- Allow :UNSPECIFIC and :WILD in all pathname slots where they should be
179     legal; don't always use a :MULTI-CHAR-WILD pattern.
180     -- Support for :COMPILE-TOP-LEVEL, :LOAD-TOP-LEVEL and :EXECUTE keywords to
181     EVAL-WHEN.
182 ram 1.12 -- #S readed no longer forces keywords into the keyword package.
183     -- Various changes to DEFSTRUCT described below.
184     -- IN-PACKAGE now prints a warning if any arguments other than the package
185     name are supplied and signals a correctable error if the package doesn't
186     exist yet.
187     -- DEFPACKAGE now tells you about inconsistencies between any existing package
188     and the DEFPACKAGE form.
189     -- Packages:
190 ram 1.14 - DELETE-PACKAGE function added according to X3J13/92 specification.
191 ram 1.12 Most operations on deleted packages signal an error.
192     - Changed IN-PACKAGE to conform to the new definition. But if you use an
193     old-style IN-PACKAGE, it will use the old behavior.
194     - Rewrote DEFPACKAGE to tell you about inconsistencies between the
195     package and the DEFPACKAGE form.
196     -- Conditions:
197 ram 1.14 - Changed conditions to be non-structure (but also non-PCL) instances
198     that support multiple inheritance and the other required CLOS
199     operations. Removed SIMPLE-CONDITION hacks for simulating multiple
200     inheritance.
201     - DEFINE-CONDITION now corresponds to proposed ANSI CL, which is a subset
202     of DEFINE-CLASS syntax and is incompatible with the earlier KMP syntax.
203     Note that in particular, :INITARG and :READER options are now
204     effectively required on every slot.
205 ram 1.12 - SIMPLE-CONDITION-FORMAT-STRING renamed to
208     macro. This provides a way to say that restarts are relevant only to a
209     certain condition.
210 ram 1.14 - Added STYLE-WARNING and PARSE-ERROR conditions.
211 ram 1.12 - Added report method for END-OF-FILE and changed system code to signal
212     it.
213     - Added PRINT-NOT-READABLE condition and made people use it.
214     -- Remove some spurious LISP package exports, and add missing ones.
215 ram 1.14 Delete package setup for optional subsystems (hemlock, etc.)
216 ram 1.12 -- Renamed SPECIAL-FORM-P to SPECIAL-OPERATOR-P.
218     DEFINE-SETF-METHOD to DEFINE-SETF-EXPANDER. The old names are still
219     defined for CLtL1 compatability.
220     -- Added degenerate versions of STREAM-EXTERNAL-FORMAT,
221     FILE-STRING-LENGTH and the :EXTERNAL-FORMAT argument to OPEN.
222     -- Hash-table code largely rewritten. MAKE-HASH-TABLE now conforms to
223     the X3J13 spec. Hash-tables can now be dumped as constants in fasl files.
225     Bug fixes:
226     -- Made the "modules:" search-list (used by REQUIRE) default to the current
227     directory.
228     -- Do a BOUNDP check so that references to undefined types inside of a
229     WITH-COMPILATION-UNIT but outside of the compiler won't cause
230     undefined-variable errors.
231     -- Set up a default for modules: search-list.
232     -- Changed BACKQ-UNPARSE to check for improper lists instead of getting an
233 ram 1.14 internal error. Some meaningless backq forms will now pprint as:
234     "### illegal dotted backquote form ###".
235 ram 1.12 -- Added SIMPLE-STYLE-WARNING, and spiffed up the simple-condition hacks so
236     that (typep x 'simple-condition) works.
237     -- In LOAD-FOREIGN, use unix-namestring on each file before passing it to the
238     linker to get rid of search lists.
239     -- Fixed the printer to stop at the fill pointer for strings with fill
240     pointers.
241 ram 1.14 -- Fixed PPRINT-DO to not flame out if one of the binding lists is NIL.
242 ram 1.12 -- Fixed load to not always consider files with NIL type to be source files.
243     If the file exists as specified, then look at the header instead of trying
244     to default the type. If :CONTENTS is specified, then don't try defaulting
245     types.
246     -- Fixed FORMAT-EXP-AUX to correctly handle variable width fields when the
247     argument is negative.
248     -- Use ~C instead of ~A when printing float exponent marker so that
249     *PRINT-READABLY* doesn't mess things up.
250     -- Fixed CLEAR-INPUT on file descriptor streams to flush any unread chars.
251     -- Now that +0.0 and -0.0 are no longer EQL, fixed ATAN to deal with them
252     correctly.
253     -- Changed SAVE-LISP to pad the core file out to CORE_PAGESIZE bytes, so that
254     when we mmap it back it, we won't get bus errors if the real page size is
255     less then the CORE_PAGESIZE.
256     -- Really really fixed GET-SETF-METHOD-MULTIPLE-VALUE for local macros. Also,
257     in the recursive calls, people were not propagating the environment
258     through, and in some places were not recursing with the multiple-value
259     version.
260     -- Fixed FLOAT to float ratios precisely by using integer division instead of
261     float division. This fixes a problem where a bit or two was lost on
262     READing floats.
263 ram 1.14 -- In the Alien type= method for FUNCTION, call ALIEN-TYPE-= instead of
264     calling ALIEN-TYPE-P with two args. [Fix from Mike Clarkson.]
265 ram 1.12
266     Compiler changes:
268     Enhancements:
269 ram 1.14 -- If the argument to compile-file is already absolute, then don't bother
270     expanding it into the TRUENAME. This allows search-lists or logical
271     pathnames to be preserved in the defined-from info (for DESCRIBE, "Edit
272     Definition", etc.)
273     -- Signal a compile-time error for division by constant 0.
274 ram 1.12 -- Replaced the FORMAT transform with one that uses FORMATTER for more
275     complete handling of format directives. This is only enabled when
276     speed > space.
277     -- Compilation to a dense byte-code is now supported, see below.
278     -- Semantic analysis/optimization of function calls has been revamped so that
279     optimizations are done more consistently, especially when the call is a
280     funcall.
281     -- A new approach is now taken to inline expansion, allowing inlining to be
282     done in more cases. In particular:
283     - local functions from LABELS or block compilation can now be inlined,
284     - global function definitions made inside of a local macro or special
285     declaration can now be inlined.
286     Inline expansion is now divided into two separate parts:
287     - Semi-inline expansion introduces a local definition of a global
288     function that has an expansion available. This is now exactly
289     equivalent to block-compiling together with that DEFUN.
290     - Local call analysis introduces new copies of locally defined INLINE
291     functions. This duplication is limited by EXT:*INLINE-EXPANSION-LIMIT*
292     (default 50) to prevent indefinite expansion of recursive functions.
293     This limit may need to be increased for compilations containing many
294     legit inline expansions in order for all calls to be inlined.
295     -- SETF functions are now better supported. Calling a compile-time constant
296     SETF function is now just as efficient as calling a function named by a
297     symbol. This is done by resolving function names to "fdefinition objects"
298     at load time. SYMBOL-FUNCTION of a non-constant symbol is now somewhat
299     slower, since the fdefinition must be located by a table lookup.
300     -- Assembler and disassembler have been reimplemented yet again, giving
301     improved portability and scheduling.
302     -- Assembly optimization is now enabled, giving large speed/space improvements
303     on MIPS and some on SPARC. This optimization is done when speed >
304     compilation-speed (i.e. not by default) since it significantly slows
305     compilation.
306     -- [mips] Lots of tweeks in order to use NIL and 0 directly from the
307     registers holding them instead of copying them into a new register and
308     then using it.
309     -- New funcallable-instance support (for PCL, etc.) Now funcallable instance
310     functions must be specially compiled, which is indicated by creating them
312     -- Moved assumed-type recording of unknown function calls from the beginning
313     of IR1 to the end so that we have the best type information about the
314     arguments.
315     -- Generalized the static-mumble-offset routines to also consider nil a
316     static symbol at offset 0.
318     ANSI changes:
319     -- Make compiler error functions use the condition system. This ANSI cleanup
320     has two advantages:
321     1] compiler-warning and warn are now equivalent, so uses of WARN will be
322     counted in the warning total and given source context.
323     2] user handlers can be defined to notice or suppress output.
324     -- Made DYNAMIC-EXTENT declaration recognized & ignored.
325     -- Allow non-keyword keyword names when the &key keyword is specified
326     separately. In FUNCTION and VALUES types, allow non-keyword symbols; you
327     must now explicitly the ":" in order to get the usual keyword naming.
328     -- Compiler-macros are now supported. See DEFINE-COMPILER-MACRO.
329     -- Minor tweeks to conform to X3J13 cleanup MACRO-DECLARATIONS:MAKE-EXPLICIT.
330     -- Fixed SYMBOL-MACROLET to allow declarations as per X3J13 cleanup SYMBOL-
331     MACROLET-DECLARE:ALLOW. When declaring things about symbol macros, type
332     declarations just wrap (the type ...) around the expansion, special
333     declarations signal an error, and ignore/ignorable declarations are
334     ignored.
336     Tuning:
337 ram 1.14 -- Tuning based on instruction-counting profiling of the compiler --- added
338     missing declarations, etc. This also motivated some general
339     array/sequence optimizations (see below.)
340 ram 1.12 -- Added block compilation declarations. Moved some stuff around to get
341     better locality.
342     -- Changed IR1-ERROR-BAILOUT to do fewer special bindings.
343     -- Inline expand some simple utility functions.
344     -- Some changes to increase the sharing among some of the automatically
345     generated functions in the compiler backend.
347     Bug fixes:
348     -- [sparc,mips] Fixed a bug in default-unknown-values where it wouldn't
349     default the first unsupplied value to nil if more then 6 values where
350     supplied.
351     -- Structure slot accessors are no longer constant-folded, because that was
352     causing problems with some MAKE-LOAD-FORM hacks.
353 ram 1.14 -- Fixed numeric type inference to realize that contagion causes the result
355 ram 1.12 -- In FINALIZE-XEP-DEFINITION, if not the current global definition, just
356     leave the defined type alone, instead of clobbering it with FUNCTION. A
357     benefit of this is that COMPILE doesn't trash the function type.
358     -- Don't run the back-end(s) on components with no code.
359     -- Don't compile load-time-value lambdas if they've already been compiled
360     because they ended up in a non-top-level component. Also, the function
361     holding a load-time-value form also has a more sensible debug name.
362     -- Fixed a problem with ASSERT-DEFINITION-TYPE when we have a keyword arg
363     with a non-constant default.
364     -- Fixed several uses of FIND to use EQUAL instead of EQL to compare function
365     names, because (SETF mumble) is now a valid function name, and isn't
366     necessarily EQL.
367     -- Bind *GENSYM-COUNTER* around compilation that it doesn't get side
368     effected.
369     -- Fixed a bug in type inference which seems to have generally prevented
370     anything from being inferred about function result types.
371     -- Fixed several bugs related to the handling of "assignment" local functions
372     (that correspond to a tail-recursive loop.)
373     -- Added a hack to IF-IF optimization to hopefully prevent some spurious
374     unreachable code notes.
375     -- Fixed call to CONTINUATION-DERIVED-TYPE to be CONTINUATION-TYPE so that we
376     don't choke on values types in the functional position.
377     -- Fixed the handling of +/- 0.0:
378     - = is no longer converted to EQL, but is directly handled by the backend.
379     - EQL is converted into a raw comparison of the bits.
380 ram 1.14 -- Fixed several bugs which caused fatal compile-time errors.
381 ram 1.12 -- Fixed LET* to correctly use the internal policy (not the interface policy)
382     for all bindings, not just the first.
383     -- In local call VOPs, must load CALLEE-NFP with MAYBE-LOAD-STACK-TN, since it
384     might not be in a register.
385     -- When iterating over the lamdba-calls in unconverting tail calls, have
386     to ignore any deleted lambda.
387     -- Fixed listify-rest-arg. It was leaving a tagged pointer to unallocated
388     memory in a descriptor register, which would confuse the garbage collector
389     if this value was still around.
390     -- Compile and dump package manipulation forms before evaluating them, so
391     they are dumped with respect to the state of the package system before the
392     form was read, not after.
394     Sparc:
395     -- New pseudo-atomic speeds allocation.
396     -- Added checking for integer division by zero.
398     Mips:
399     -- Changed generic-= and generic-/= to not assume that EQ implies =,
400     because it doesn't in the case of NaNs.
401     -- Major rewrite of many things. Merged mumble-immediate SCs into the
402     immediate SC. Wrote several vops to use :constant arg types better.
403     Rewrote all the type testing stuff. New pseudo-atomic, allocators now
404     inline.
405     -- Fixed UNBIND-TO-HERE to not dereference past the end of the binding stack.
406     -- Changed to load the function from static-function-offset relative to NIL
407     instead of computing the symbol and then loading the function.
408     -- Added Miles' change to use JALI instead of LI/JR now that it exists.
409     -- Fixed a lifetime bug in full call. This only showed up if there were
410     either a variable number or > 6 arguments and the caller was large enough
411     that the compute-lra-from-code couldn't be done in one instruction.
413     Byte compilation:
415     Byte compilation reduces the size of the Lisp process by allowing rarely used
416 ram 1.14 functions to be compiled more compactly. In comparison with 16f, the basic
417     system image is about 20% smaller. The full system with Hemlock CLX, etc., is
418     also 19% smaller even though it contains new code (the Motif interface) because
419     a larger fraction of the extra systems are byte compiled.
420 ram 1.12
421 ram 1.14
422 ram 1.12 Byte compilation overview:
424     The decision to byte-compile or native compile can be done on a per-file or
425     per-code-object basis. COMPILE-FILE now has a :BYTE-COMPILE argument. If T,
426     we byte-compile everything and create a machine-independent fasl file
427     (dependent only on byte order, file type "bytef" or "lbytef".)
428     If :MAYBE (the default, from EXT:*BYTE-COMPILE-DEFAULT*), things are
429     byte-compiled when speed = 0 and debug <= 1. Top-level forms are byte-compiled
430     by default (controlled by ext:*byte-compile-top-level*.)
432     Byte compilation is roughly twice as fast native compilation. Byte compiled
433     code runs 50x--200x slower than native code, and is 6x more dense. This is
434     about 10x faster than the IR1 interpreter, which is itself considered fast in
435     comparison to other Common Lisp interpreters. Historical perspective: this is
436     about as fast as Spice Lisp on a PERQ.
438     Tuning:
439 ram 1.14 -- Tweaked GENSYM so that the CONCATENTATE is open-coded.
440     -- Tweaked WITH-ARRAY-DATA to test for (not (array-header-p )) instead of
441     (simple-array * (*)), since that's much faster. This helps all functions
442     that accept non-simple arrays.
443     -- Transform MEMBER, DELETE and ASSOC to MEMQ, ASSQ and DELQ when possible.
444     Inline expand vector & list POSITION, vector FILL and list DELETE-IF.
445     -- Add some INDEX declarations in simple-string concatenate/replace
446     transforms.
447 ram 1.12 -- made DIGIT-CHAR-P and DIGIT-WEIGHT maybe-inline.
448     -- Added declarations from efficiency notes in fd-stream, load, package,
449     reader, char and hash.
450     -- Revived the support for FAST-READ-CHAR and the STREAM-IN-BUFFER, which
451     allows READ-CHAR and READ-BYTE to be done with 0 function calls rather than
452     2.
453     -- Because of above two changes, both the reader and the fasloader are now
454     significantly faster (reader 2x.)
455     -- Default (non-frozen) structure type tests are now significantly faster (no
456     function calls), and somewhat smaller. This and the reader improvement
457     have sped up the compiler somewhat.
458     -- Many debug-info and compiler data structures are now annotated as pure,
459     alloing them to be put in read-only space. This reduces the amound of
460     stuff in static space, speeding GC.
461     -- Real-valued hash-table parameters (rehash-threshold etc.) are
462     canonicalized to single-floats.
463     -- Replaced ISQRT with a much faster version off the net.
464     -- serve-event now uses UNIX-FAST-SELECT, so it can can handle >32 file
465     descriptors and is more efficient.
466     -- Changed UNIX-FAST-SELECT to a macro so that it can be efficient. Changed
467     FD-SET stuff to be efficiently compilable.
468     -- Use an auxiliary function to make the condition for macro arg count
469     errors to save space in macro definitions.
470 ram 1.14 -- Byte compile the expander functions for all macros except those in the
471     cold load. Byte-compile various user-interface stuff like the debugger,
472     disassemble and structure print functions. Byte-compile most Hemlock
473     commands.
474 ram 1.12 -- Compile PCL's guts unsafe when #+SMALL.
475     -- Some gratuitous RANDOM tuning. Random double floats are now much, much
476     faster. Added transforms for RANDOM to type-specific functions (which can
477     then be inline-expanded).
479     DEFSTRUCT and classes:
481     The structure representation has been changed to point directly to a type
482     descriptor rather than to the symbol type name. This allows faster type tests
483     and better GC support. Also, structure redefinition is now much more
484     conservative; formerly, many cases where code was compiled using differing
485     versions of the same structure were quietly ignored or resulted in strange
486     behavior. Raw allocation of typed slots dramatically increase the efficiency
487     of float-valued slots. Much of DEFSTRUCT has been rewritten, and is now
488     believed to be ANSI complaint.
490     ANSI changes:
491     -- Default defstruct keyword constructors can no longer reference argument
492     values in slot init forms. BOA constructors can still do this, so defining
493     a BOA constructor with all keyword args will have the old effect.
494     -- Class objects are now implemented, see FIND-CLASS, CLASS-NAME, TYPEP,
495     CLASS-OF. TYPE-OF is now based on CLASS-OF, and returns slightly different
496     results than before.
497     -- STRUCTURE-CLASSes now exist. See also the STRUCTURE-OBJECT type.
498     -- BUILT-IN-CLASSes also exist. In some cases CLASS-OF (legally) returns
499     non-standard subclasses of the standard class, e.g. for a float vector, the
501     now DEFTYPEs.
503     Bug fix:
504     -- Typed structures now have the correct (though rather odd) semantics of
505     :offset and :named when inclusion is done.
507     Raw slots:
508     -- Structure slots of subtypes of SINGLE-FLOAT, DOUBLE-FLOAT and
509     (UNSIGNED-BYTE 32) are now allocated in non-descriptor storage, and can be
510     read/written without number-consing overhead.
512     Type tests:
513 ram 1.13 -- The default (non-frozen) structure type predicate is now significantly
514 ram 1.12 faster (no function call) in the case where the argument is a structure
515     of another type or the type is a supertype of the object's type. The code
516     is also somewhat smaller.
518 ram 1.14 Structure Redefinition:
519 ram 1.12 -- Handing of structure redefinition is now much more comprehensive.
520     -- Definitions are only considered incompatible when slots have moved or been
521     added, slot types are changed to a type that is not a subtype of the old
522     type, or the inheritance structure has changed. Previously any change at
523     all would produce a warning.
524 ram 1.13 -- When a change is incompatible, the default restart (CONTINUE) invalidates
525     old instances, constructors and predicate uses. When speed <= safety, a
526 ram 1.12 LAYOUT-INVALID error will be signalled when obsolete instances are passed
527     to a type test (e.g. for type checking.) Use of old code on new instances
528     or old instances when speed > safety > 0 will result in type errors.
529     Other restarts allow you to ignore the redefinition or to clobber the
530 ram 1.13 existing information, preserving the old code (in case the change is
531     actually compatible.)
532 ram 1.12 -- If the structure length or inheritance structure has changed, an error
533     is signalled when you load code that was compiled with a different
534     structure definition than the one currently in effect.
536 ram 1.14 Structure Internals:
537 ram 1.12 -- VM:STRUCTURE-USAGE renamed to VM:INSTANCE-USAGE. Internally, the structure
538     type and accessors have also been renamed, e.g.
540     -- The non-standard STRUCTURE type has become has become EXT:INSTANCE. To
541     (portably) test whether something is really a structure object, do
544     PCL:
545     The largest changes are:
546     -- PCL port revamped to re-integrate PCL classes with the type system and to
547     more efficiently dispatch on structure and built-in types. Some
548     miscellaneous tuning. CLOS symbols are now exported from the LISP package,
549     so you don't need to USE-PACKAGE PCL anymore.
551     PCL notes:
553 ram 1.14 The integration of PCL with the CMU CL type system has been substantially
554     improved. There are significant improvements in the speed of PCL generic
555     function dispatch of built-in and structure classes and TYPEP of PCL classes.
556     There should also be reduced run-time compilation (e.g. in the Motif
557     inspector) due to less use of non-precompiled dispatch functions.
558 ram 1.12
559 ram 1.14 The compiler now recognizes the PCL::CLASS declaration. This clues the
560     compiler in on PCL's knowledge of types (due to being a specialized argument
561     to a method.) CLOS class names are recognized as "real" types by the
562     compiler, not SATISFIES DEFTYPES. Note that LISP:CLASS is still not a PCL
563     class, so PCL needs to shadow CLASS and STANDARD-CLASS.
564 ram 1.12
565     Fixed the #< print function to flame out if *PRINT-READABLY* is true.
567 ram 1.14 Supply missing :INITIAL-ELEMENT NIL in MAKE-ARRAY call which can result in a
568     "0 is not a list" or "segment violation" error on redefining a class.
569 ram 1.12
570 ram 1.14 September-16-92-PCL-e has been incorporated into the CMU CL sources thanks
571     to Rick Harris. Merge fix to pessimization of GFs with many standard class
572     specializers but also some EQL or built-in class specializers.
574 ram 1.12 Graphical debugger/Motif toolkit:
576     We have implemented a new interface to Motif which is functionally similar to
577     CLM, but works better in CMU CL. See:
578     doc/motif-toolkit.doc
579     doc/motif-internals.doc
581     This motif interface has been used to write a new inspector and graphical
582     debugger. There is also a Lisp control panel with a simple file management
583     facility, apropos and inspector dialogs, and controls for setting global
584     options.
586     Call INTERFACE:LISP-CONTROL-PANEL to create the control panel. When
587     INTERFACE:*INTERFACE-STYLE* is :GRAPHICS (the default) and the DISPLAY
588     environment variable is defined, the graphical inspector and debugger will be
589     invoked by INSPECT or when an error is signalled. Possible values are
590     :GRAPHICS and :TTY. If the value is :GRAPHICS, but there is no X display,
591     then we quietly use the TTY interface.
593     Debugger:
595     The command-line debugger now implements the breakpoint and step commands
596     described in the manual:
597     LIST-LOCATIONS [{function | :c}] list the locations for breakpoints.
598     Specify :c for the current frame. Abbreviation: LL
599     LIST-BREAKPOINTS list the active breakpoints.
600     Abbreviations: LB, LBP
601     DELETE-BREAKPOINT [n] remove breakpoint n or all breakpoints.
602     Abbreviations: DEL, DBP
603     BREAKPOINT {n | :end | :start} [:break form] [:function function]
604     [{:print form}*] [:condition form] set a breakpoint.
605     Abbreviations: BR, BP
606     STEP [n] step to the next location or step n times.
608     These commands provide a degree of support for stepping and setting
609     breakpoints inside compiled functions. The variables
611     verbosity of LIST-LOCATIONS.
613     Enhancements:
614     -- Changed PRINT-FRAME-CALL to print the source if verbosity >= 2 and
615     the source is available.
616     -- Changed source location printing to cache information so that it is much
617     faster when many locations in the same function are printed. The source
618     file is now only printed when the file changes from one printing to the
619     next.
621     Bug fixes:
622     -- Added explicit error checking to the debugger so that we don't get an
623     internal error (bus error in unsafe code, etc.) when attempting to display
624     source from a file that has been excessively modified.
625     -- Bind *BREAK-ON-SIGNALS* to NIL when we call BREAK in SIGNAL so that the
626     debugger doesn't recurse on itself.
627     -- Changed HANDLE-BREAKPOINT in the debugger to allow breakpoints that nobody
628     wants. This can happen if a function-end breakpoint was deactivated while
629     the function was on the stack, because there is no way to convert the
630     bogus-lra back into the real lra.
631     -- Fixed COMPUTE-CALLING-FRAME to not try using %CODE-DEBUG-INFO on
632     things that arn't code components.
633     -- Instead of doing after breakpoints in Lisp, use the new C function
634     breakpoint_do_displaced_inst. That way the C code can do different things
635     on different machines (like use single stepping if available).
637 ram 1.14
638 ram 1.12 Misc changes:
640     CLX:
641     We are now distributing version R5.01 of the CLX X library. Among other
642     changes, this is supposed to support the cookie-based host authentication
643 ram 1.14 used by OpenWindows. Now compiled with the :CLX-ANSI-COMMON-LISP feature.
644 ram 1.12
645 ram 1.14 Pathnames:
646     -- Logical pathnames are now implemented and wildcard matching has been
647     generalized to make them useful. Any namestring beginning with HOST:
648     (where HOST is a defined logical host) will be parsed as a logical
649     pathname. If the prefix is not a defined logical host, it will be still
650     be parsed as a CMU CL "search list."
651     -- Pattern-matching on :WILD-INFERIORS is now implemented, but the
652     Unix code treats it pretty much like :WILD.
653     -- More error cases are detected in TRANSLATE-PATHNAME.
654     -- See new user's manual for CMU CL specific documentation.
656 ram 1.12 Stream internals:
657     -- Deleted read-line methods. For simplicity, this rather unimportant
658     operation is now implemented using read-char.
659     -- READ-N-BYTES eof-error-p nil is now mostly non-blocking (it only reads what
660     is in the buffer, or what unix-read returns if the buffer is empty.) To be
661     sure it won't block, you must guard it with a LISTEN.
663     Extensions:
664 ram 1.14 -- Changed the stream arg to DISASSEMBLE to be a keyword to avoid optional &
665     keyword lossage.
666 ram 1.12 -- Changed PROFILE:PROFILE argument count determination to parse the function
667     type and look at it, instead of trying to fake it. Among other things,
668     this allows efficient profiling of functions with FTYPE declarations even
669     when compilation policy has caused the function-object's type to be
670     dropped.
671 ram 1.14 -- Add :CALLERS option to PROFILE which records the most common callers
672     of each profiled function.
673     -- Add new "CPROFILE" package which does instruction-counting profiling with
674     the compiler's assistance.
675 ram 1.12 -- Fixed DI:FUNCTION-DEBUG-FUNCTION to work on closures.
676     -- Added EXT:DO-HASH.
677     -- User-defined hashtable tests are now supported. There is a function
678     DEFINE-HASH-TABLE-TEST that takes three arguments: the symbol name of the
679     hash table test, the test function, and the hash function. It updates
680     *hash-table-tests*, which is now internal. The test function takes two
681     objects and returns true iff they are the same. The hash function takes
682     one object and returns two values: the (positive fixnum) hash value and
683     true if the hashing depends on pointer values and will have to be redone if
684     the object moves.
685     -- Added weak hash-table support.
686     - Removed (setf weak-pointer-value) and made make-weak-pointer itself the
687     compiler primitive in order to simplify the gengc port.
688     - Added stuff to fake scavenger hooks in the non-gengc system.
689 ram 1.14 -- Moved the RUN-PROGRAM fork/exec stuff into C, for ease in porting.
690 ram 1.12
691     Hemlock:
692     -- In DELETE-BREAKPOINTS-BUFFER-HOOK, if no wire (server died), then
693     don't do anything.
694     -- Changed BEEP flashing to use SLEEP 0.1 instead of DISPLAY-FINISH-OUTPUT
695     because this was causing recursive entry of CLX.
696 ram 1.14 -- Fixed from debugger edit command "can't edit source" message not
697     spuriously reinvoke the debugger when invoked from the command line.
698     -- Fix initialization of print-representation attribute so that characters
699     >127 don't cause text to mysteriously disappear.
700     -- Flush carefully-add-font-path call. If people want library:fonts/ in
701     their font-path, they can put it there. This should eliminate the Hemlock
702     initialization error which would happen when using X remotely.
704 ram 1.12
705     Changed SAVE-LISP to no longer save the stacks. Instead, when the core is
706     restored, a (supplied) initial function is invoked which can do whatever kind
707     of setup it wants. This makes a saved lisp totally independent of the
708     location of the C stack, and eliminates the "environment too big" error that
709     happened in some SUNOS environments. A consequence of this is that calling
710     SAVE-LISP terminates the currently running Lisp.
712     SunOS/SPARC:
713     Changed software-version to use /usr/bin/uname instead of stringing the
714     kernel.
716     Removed the load of bit-bash, because we don't want to have to support the
717     assemble routine versions.
719     Significant revamping of startup code (lisp now, not ldb.) The new startup
720     code has better breakpoint support and improved portability.
722 ram 1.14 Added :CMU17 to the features list so that PCL can tell if it is in a
723 ram 1.12 version 16 or a version 17 series core.
726 ram 1.11 Release notes for CMU Common Lisp 16f, 11 December 92
728     The changes between 16e and 16f are almost exclusively bug-fixes. When we
729     announce a version 17 beta, 16f will probably become the default release
730     (replacing 15e). The PCL has been upgraded from "March 92 (2a)" to
731     "March 92 (2c)", which provides some bug-fixes; also, all of the patches in
732     the March-92-PCL-bugs file have been applied.
734     Enhancements:
735     -- PROVIDE & REQUIRE are now back in the system, since proposed ANSI CL has
736     reinstated them as deprecated features. See the doc strings for these
737     functions and EXT:DEFMODULE.
738     -- The SPARC dynamic heap size limit has been doubled from 64meg to 128meg.
740     Pretty printer:
741     -- Fixed a bug in pprint-let that caused to to barf on (let (nil) ...).
742     -- Fixed pprint-lambda-list to print a space before the dot when the tail of
743     the lambda list is shared. In other words, print (foo . #1=(bar baz))
744     instead of (foo. #1=(bar baz)).
745     -- Added an additional use of ~^ in pprint-flet so that (flet (nil) ...)
746     doesn't flame out.
747     -- Make pretty printer properly process pprint tabs when output is forced.
748     -- In format pprint logical blocks, fixed ~^ to act like
749     PPRINT-EXIT-IF-LIST-EXHAUSTED instead of blowing out to some containing
750     directive.
752     Compiler:
753     -- Fixed compiler internal error with dead-code deletion of top-level code.
754     -- Bind *gensym-counter* instead of setting it so that compiling doesn't
755     globally reset the gensym counter.
756     -- Fixed problem with interpreted LOAD-TIME-VALUE causing undefined function
757     VALUE-CELL-REF errors.
758     -- Preserve the arglist in interpreted functions for DESCRIBE, etc.
759     -- Gag bound-but-not-referenced warnings when the EXT:INHIBIT-WARNINGS
760     optimize quality is 3.
761     -- Fixed a problem with register allocation conflict analysis which appeared
762     when a function was called with ~>= 50 arguments.
763     -- Fixed bug with optimization of tail local calls.
764     -- Fixed interpreted PROCLAIM/DECLAIM to ignore
765     START-BLOCK, END-BLOCK and declared DECLARATION declarations.
766     Changed the unrecognized proclamation error to be a warning.
767     -- Fixed float heap allocation to not wedge when the store causes a trap
768     (SPARC only.)
770     Trace:
771     -- Added pretty-printer directives so that arg lists and results print better.
772     -- Fixed UNTRACE not to flame out when untracing untraced functions.
773     -- Fixed bug with redefining function traced with encapsulation (e.g.
774     interpreted functions.
776     Misc bug fixes:
777     -- Fixed I/O timeout handling (e.g. for CLX) to correctly borrow from the
778     timeout seconds when computing the new value for the timeout microseconds.
779     -- Restored proper (prompt) handling of queued CLX events in SERVE-EVENT
780     -- Alien enums always take up an int to be compatable with C. Also,
781     sort the from-alist so that enum aliens are unparsed in a canonical
782     format.
783     -- When doing macro destructuring, check to see if some part of a lambda-list
784     is a LIST before checking to see if it is a SYMBOL, because we want NIL to
785     act like the empty list, and not an attempt to bind NIL.
786     -- Fixed PACKAGE-ERROR to have a PACKAGE slot instead of a PATHNAME slot.
787     -- Changed DOLIST not to introduce the spurious let around the result form
788     when there is no result form. Also, just read the var in the spurious
789     let, instead of using IGNORABLE, since the var might be special.
790     -- In complex DEFSETF, don't bother creating temp vars for constants. This
791     is necessary so that keywords stay keywords, and are not changed to
792     gensyms.
794     Enhancements:
795     -- Changed the backquote expanded functions (backq-list, ...) from being
796     inline functions to compiler-macros, since although the optimizer does
797     eventually get the right code, it has to work awful hard. Changed BREAK
798     to accept a condition as well as a format string.
799     -- Exported EXT:CONNECT-TO-UNIX-SOCKET and EXT:CREATE-UNIX-SOCKET, which had
800     been forgotten before. Added code to CONNECT-TO-UNIX-SOCKET so that Unix
801     domain sockets are available for connecting to other processes.
802     -- Removed sys:*task-data* and sys:*task-notify* because they aren't used
803     even under Mach.
807 ram 1.10 Release notes for CMU Common Lisp 16e, 5 August 92
809     16e is primarily a bug-fix release. The main changes from 16d are:
810     -- CLOS support is from March 92 PCL (2a). This is a new version of PCL
811     developed by Richard Harris which incorporates many bug-fixes and ANSI
812     compliance cleanups. He has also back-merged the CMU changes into his
813     sources so that we can release future PCLs without time-consuming merging.
814 ram 1.11 On the downside, there are a couple of new bugs (discrimination on
815     pcl::structure-object doesn't always work; generic functions which contain
816     methods which discriminate on both null and list sometimes do not work).
817     Patches for these bugs are available in March-92-PCL-bugs in the CMU CL
818     release area and by anonymous ftp from host parcftp.xerox.com
819     (, in the directory pub/pcl/.
820 ram 1.10 -- TRACE has been reimplemented, has a new syntax and new features.
821     -- The hardcopy and info documentation has been updated. Note that it
822     describes some debugger capabilities (breakpoints) which won't appear
823     until version 17.
825     The fasl file format is the same as for 16d, but some code may need to be
826     recompiled. In particular, the expansion of PPRINT-LOGICAL-BLOCK has changed.
829     March 92 PCL highlights: (see notes.text in the sources for details)
830     -- This version of PCL is much closer than previous versions of PCL to the
831     metaobject protocol specified in "The Art of the Metaobject Protocol",
832     chapters 5 and 6, by Gregor Kiczales, Jim des Riveres, and Daniel G.
833     Bobrow.
834     -- You can use structure-class as a metaclass to create new classes.
835     Classes created this way create and evaluate defstruct forms which
836     have generated symbols for the structure accessors and constructor.
837     -- Various optimization of instance variable access, both inside and outside
838     of methods.
839     -- More work (lookups and precompilation) is done at compile and load time,
840     rather than run-time.
843     New TRACE:
845     Trace has been substantially rewritten, and has a new syntax as well as new
846     functionality:
847     -- Tracing of compiled functions is now implemented using breakpoints.
848     Breakpoints destructively modify the code object, causing all calls to the
849     function to be trapped, instead of only those calls that indirect through
850     the symbol. This makes TRACE more useful for debugging programs that use
851     data structures containing function values, since you can now trace
852     anonymous functions and macros. Also, the breakpoint stops the function
853     after the arguments have been parsed, so arguments can accessed by name in
854     the debugger or in TRACE options.
855     -- Depending on the ENCAPSULATE option and DEBUG:*TRACE-ENCAPSULATE-DEFAULT*,
856     encapsulation may be used instead. This is the default for closures,
857     generic functions and interpreted functions.
858     -- TRACE options are no longer set off by extra parens, and you can specify
859     global trace options which affect all functions traced by a particular
860     call to TRACE.
861     -- Conditional breakpoints now work much better than before.
862     -- *DEBUG-PRINT-LEVEL*, -LENGTH* are used instead of a separate
863     *TRACE-PRINT-LEVEL*, etc.
865     Here is the documentation string (see also the hardcopy/info documentation):
866     TRACE {Option Global-Value}* {Name {Option Value}*}*
867     TRACE is a debugging tool that prints information when specified functions
868     are called. In its simplest form:
869     (trace Name-1 Name-2 ...)
871     TRACE causes a printout on *TRACE-OUTPUT* each time that one of the named
872     functions is entered or returns (the Names are not evaluated.) The output
873     is indented according to the number of pending traced calls, and this trace
874     depth is printed at the beginning of each line of output.
876     Options allow modification of the default behavior. Each option is a pair
877     of an option keyword and a value form. Options may be interspersed with
878     function names. Options only affect tracing of the function whose name they
879     appear immediately after. Global options are specified before the first
880     name, and affect all functions traced by a given use of TRACE.
882     The following options are defined:
884     :CONDITION Form
886     :CONDITION-ALL Form
887     If :CONDITION is specified, then TRACE does nothing unless Form
888     evaluates to true at the time of the call. :CONDITION-AFTER is
889     similar, but suppresses the initial printout, and is tested when the
890     function returns. :CONDITION-ALL tries both before and after.
892     :WHEREIN Names
893     If specified, Names is a function name or list of names. TRACE does
894     nothing unless a call to one of those functions encloses the call to
895     this function (i.e. it would appear in a backtrace.) Anonymous
896     functions have string names like "DEFUN FOO".
898     :BREAK Form
899     :BREAK-AFTER Form
900     :BREAK-ALL Form
901     If specified, and Form evaluates to true, then the debugger is invoked
902     at the start of the function, at the end of the function, or both,
903     according to the respective option.
905     :PRINT Form
906     :PRINT-AFTER Form
907     :PRINT-ALL Form
908     In addition to the usual prinout, he result of evaluating Form is
909     printed at the start of the function, at the end of the function, or
910     both, according to the respective option. Multiple print options cause
911     multiple values to be printed.
913     :FUNCTION Function-Form
914     This is a not really an option, but rather another way of specifying
915     what function to trace. The Function-Form is evaluated immediately,
916     and the resulting function is traced.
919     If T, the tracing is done via encapsulation (redefining the function
920     name) rather than by modifying the function. :DEFAULT is the default,
921     and means to use encapsulation for interpreted functions and funcallable
922     instances, breakpoints otherwise. When encapsulation is used, forms are
923     *not* evaluated in the function's lexical environment, but DEBUG:ARG can
924     still be used.
926     :CONDITION, :BREAK and :PRINT forms are evaluated in the lexical environment
927     of the called function; DEBUG:VAR and DEBUG:ARG can be used. The -AFTER and
928     -ALL forms are evaluated in the null environment.
931     Assorted bug fixes and enhancements:
933     System code:
934     -- Changed default base file name for LOAD-FOREIGN to be argv[0] rather than
935     being hard-wired to "lisp".
936     -- Fixed a bad declaration which caused garbage collection to fail if more
937     than MOST-POSITIVE-FIXNUM bytes had been consed since process creation.
938     -- Changed GET-INTERNAL-RUN-TIME to use UNIX-FAST-GETRUSAGE to avoid
939     number-consing and generic arithmetic. Also, rearranged the computation
940     so that the time is correctly computed for up to 457 days, instead of only
941     71 minutes.
942     -- Merged Miles' fix to MAKE-PATHNAME so that it knows the difference between
943     an arg being NIL and being unsupplied.
944     -- Some partial fixes to circular printing (the #1=#1# bug).
945     PPRINT-LOGICAL-BLOCK no longer checks the list argument for CAR
946     circularity, now that OUTPUT-OBJECT does it for us.
947     -- Fixed reader dispatch macro characters to be case-insensitive, and to
948     disallow digits as sub-characters.
949     -- Changed #A reader to allow arbitrary sequences instead of just lists.
950     -- RUN-PROGRAM now gives a proper error message when "fork" fails (i.e. too
951 ram 1.11 many processes.)
952     -- Fixed a bug in initialization of saved cores which caused the old
953     environment to be left on the end of EXT:*ENVIRONMENT-LIST*. One symptom
954     was that RUN-PROGRAM would run programs with strange environment values
955     based on those in effect at the time the core was saved. In particular,
956     Lisp subprocesses (i.e. Hemlock slaves) might get the wrong value of
957     CMUCLLIB, which caused the slave to die before connecting.
958 ram 1.10 -- SYSTEM:SERVE-EVENT (and XLIB:EVENT-CASE, etc.) now correctly handle
959     non-integer timeouts. Added declarations to improve the efficiency of
960     event handling.
961     -- Fixed some bugs in UNIX-SELECT which could cause Lisp to hang when more
962     than 32 files were open. Also, improved efficiency in this case.
963     -- Merged Olssons fix to WITH-ENABLED-INTERRUPTS to not try to change
964     interrupt characters anymore.
965     -- A number of bug-fixes for breakpoint support in compiled code (but there
966     are still problems with arbitrary breakpoints.)
967     -- Fixed DI:FRAME-CATCHES
969     CLX:
970     -- Fixed the implementation-dependent pixarray copying routines (for
971     GET-IMAGE, etc.) so that they don't occasionally trash memory, and are
972     actually faster.
973     -- Fixed the definition of the ANGLE type (used by DRAW-ARC, etc.) to work
974     regardless of the kind of real number (single or double float, rational,
975     etc.)
976     -- Fixed several places in image operations where values that could really
977     be negative were declared to be non-negative.
979     Compiler:
980     -- Fixed a bug which caused an internal error whenever a call to random
981     was compiled and the argument type wasn't known to be either a float or
982     an integer.
983     -- Fixed a bug which caused an internal compiler error when a value that
984     wasn't used had an unproven type assertion.
985     -- Fixed some more dead-code deletion bugs.
986     -- Fixed a problem with the new "assignment" optimization of local function
987     call where the compiler could get assertion failures such as tail-sets not
988     being equal.
989     -- Fixed a few places where reoptimization wasn't being triggered when it
990     should have been.
991     -- You can now have a TAGBODY with more than one tag that is non-locally
992     exited to. Evidently this never worked...
993     -- Some changes in debug-info format related to breakpoint support.
995     Misc:
996     -- Fixed some Hemlock Dired commands to know that PATHNAME-DIRECTORY is
997     now a list, not a vector.
998     -- Fixed the bin/sample-wrapper script to use "$@" instead of $* so that
999     arguments are properly passed through.
1002 ram 1.9 Release notes for CMU Common Lisp 16d, 30 May 92
1003 ram 1.5
1004 ram 1.8 16d is our first version 16 general release, and incorporates many changes not
1005     present in the 15 series. It is currently fairly close to our current
1006     internal development (alpha) systems, and is thus less stable. The major
1007     changes are:
1008     New Aliens
1009     New pathnames
1010     New pretty printer
1011     New format
1012     R5.0 CLX.
1013     5/1/90 May Day PCL (REV 4b)
1014     Revised manual
1015 ram 1.5
1016 ram 1.8 The fasl file format is nominally compatible with version 15, but the pathname
1017     change affects any pathname constants in fasl files, which includes the
1018     defined-from information present in every fasl file. It is probably a good
1019     idea to recompile everything.
1020 ram 1.7
1021 ram 1.8 CLX and Hemlock are now optional. When CMU CL is installed, the maintainer can
1022     elect not to load CLX and Hemlock -- this saves 7 megabytes of disk and
1023     improves memory usage somewhat. See the installation section of the README
1024     file for details.
1025 ram 1.5
1026 ram 1.8 The ``CMU Common Lisp User's Manual'' has been updated to be more helpful for
1027     non-CMU users. The new manual also documents the new Alien facility for
1028     foreign function calls and data structure access. The manual is now formatted
1029     with Mike Clarkson's LaTeXinfo package, so a consistent version of the
1030     documentation is available online in Gnu info format. See `doc/cmu-user.ps'
1031     and `doc/cmu-user.info'.
1033 ram 1.5
1034 ram 1.8 General system code:
1035 ram 1.3
1036 ram 1.8 ANSI cleanups:
1037     -- ANSI Compiler macros are now implemented: see COMPILER-MACRO-FUNCTION,
1039     -- Fixed things that invoke *MACROEXPAND-HOOK* to coerce it to a function
1040     before calling it.
1041     -- Fixed MACRO-FUNCTION to take an environment argument.
1042     -- SYMBOL-MACROLET now accepts declarations.
1043     -- SHADOW now accepts strings in addition to symbols.
1045     -- IGNORABLE is now in the LISP package instead of the EXT package.
1046     -- ADJUST-ARRAY has been updated to allow adjusting of arrays which were
1047     not created with :adjustable non-nil to be adjusted to new dimensions.
1048     -- ADJUSTABLE-ARRAY-P has been updated correspondingly. It returns T if
1049     adjust ADJUST-ARRAY would return an EQ array.
1050     -- The BASE-CHARACTER type has been renamed to BASE-CHAR.
1051     -- The REAL type and REALP function are now implemented.
1052     -- Changed the default structure printer to print slot names as keywords
1053     instead of unqualified symbols.
1054 ram 1.3
1055 ram 1.8 Enhancements:
1056     -- Added MAYBE-INLINE declaration for GET, PUT, etc., so that these
1057     functions can be inline expanded according to the compilation policy.
1058     -- Added some type declarations so that GET-INTERNAL-REAL-TIME doesn't cons.
1059     -- Process the command line before printing the herald so that we can eval
1060     some form and quit without printing anything.
1061     -- SET now protects against setting T, NIL, and keywords. (SETF
1062     SYMBOL-FUNCTION) now expands into FSET, which protects against defining
1063     NIL.
1064     -- Substantially rearranged function describing to make it more consistent,
1065     and added support for describing interpreted functions.
1066     -- PURIFY is now called multiple times during system building to improve
1067     locality.
1068     -- (EVAL-WHEN (EVAL) ...) is now actually eval'ed.
1069 ram 1.3
1070     Bug fixes:
1071 ram 1.8 -- Fixed bug in NTH-VALUE where it expanded into bogus code unless ``n'' was
1072     a constant integer.
1073     -- Fixed FMAKUNBOUND to return the symbol instead of T.
1074     -- Allocate memory as executable so that the OS knows to maintain cache
1075     consistency.
1076     -- Changed DESCRIBE to allow T or NIL as the stream argument.
1077 ram 1.3
1078 ram 1.8 Load enhancements and cleanups:
1079     -- The initial value of *LOAD-VERBOSE* is now T. Additionally, LOAD no
1080     longer always binds *LOAD-VERBOSE* and *LOAD-PRINT*. Now it only
1081     binds them when :VERBOSE or :PRINT are explicity supplied. Therefore, you
1082     can set either of these in your init file and it will take effect.
1083     -- Normally when *LOAD-VERBOSE* is T, only the file name is printed.
1084     Formerly, the loaded stream was always printed, whereas now a stream is
1085     printed only when the stream is not a file stream.
1086     -- Added ANSI features *LOAD-TRUENAME*, *LOAD-PATHNAME* and *LOAD-PRINT*.
1087     -- As per ANSI, bind *READTABLE* to itself to make assignments file-local.
1088     -- Added new variables EXT:*SOURCE-FILE-TYPES* and EXT:*OBJECT-FILE-TYPES*.
1089     When no file type is specified, LOAD tries the types in these lists to
1090     locate the source and object files. LOAD now recognizes source types "l",
1091     "cl" and "lsp" in addition to "lisp".
1092     -- The compiler OPTIMIZE policy is now bound during load, so proclamations in
1093     a file don't leave the global policy clobbered when the load is finished.
1094     -- Changed the :IF-SOURCE-NEWER option to signal an error and use restarts,
1095     rather than PROMPT-FOR-Y-OR-N. Fixed the load source case to actually
1096     load the source, rather than loading the object as a source file...
1097     -- Changed load to deal with source files having NIL type more reasonably.
1098     -- If a wild pathname is given to LOAD, all files matched will be loaded.
1099     -- Proceeding from nonexistent file errors has been improved. It is no longer
1100     assumed that missing files are always source files. Added condition
1101     restarts for missing files.
1102     -- Improved formatting of error and warning messages.
1103 ram 1.3
1105 ram 1.8 Garbage collection:
1106     -- Changed the minimal ROOM output to include all easily computed information
1107     including whether GC is disabled. The verbose ROOM now conses less.
1108     -- Removed the :ENABLE-GC SAVE-LISP option, as it's no longer needed.
1109     Garbage collection is now correctly enabled in cores which have been saved
1110     and then restarted.
1111     -- Added EXT:BYTES-CONSED-BETWEEN-GCS, a function that returns (and sets when
1112     used with setf) *BYTES-CONSED-BETWEEN-GCS*. Additionally, it changes
1113     *GC-TRIGGER* immediately to reflect the new values of *bytes-consed...*.
1114     -- TIME now displays the GC run-time.
1115     -- Added EXT:*GC-RUN-TIME* with accumulates the INTERNAL-RUN-TIME spent doing
1116     garbage collection. Added declarations to make EXT:GET-BYTES-CONSED more
1117     efficient.
1118     -- The top-level REP loop now zeros the unused non-zero portion of the
1119     control stack to discourage spurious garbage retention.
1120     -- The garbage collector now closes open file streams when it reclaims them.
1121 ram 1.3
1123 ram 1.8 Packages:
1124     -- The LISP and USER packages have been renamed to COMMON-LISP and
1125     COMMON-LISP-USER. LISP and USER are nicknames, so they can still be used.
1126     -- The LISP package namespace has been cleaned up somewhat. For example,
1127     *DESCRIBE-PRINT-LEVEL* is no longer exported from LISP.
1128     -- The Mach/Unix division in the package system has been clarified a great
1129     deal. Unix specific features have been moved from the MACH package to the
1130     UNIX package. Mach specific features have been left in (or moved to) the
1131     MACH package. For example, all standard Unix syscalls are related
1132     definitions are un UNIX, whereas vm_statistics remains in MACH and GR-CALL
1133     has been moved to MACH.
1134 ram 1.3
1135 ram 1.8 SETF cleanups:
1136     -- Changed GET-SETF-METHOD-MULTIPLE-VALUE to try to macroexpand-1 the form
1137     when it's an atom in case it's a symbol-macro as per the X3J13 cleanup
1138     SYMBOL-MACROLET-SEMANTICS:SPECIAL-FORM. Now you can safely INCF, etc.
1139     symbol macros where the macroexpansion has side effects.
1140     -- Fixed SETF of GETF to evaluate the various parts in the correct order as
1142     -- X3J13 cleanup SETF-MULTIPLE-STORE-VARIABLES:
1143     Extend the semantics of the macros SETF, PSETF, SHIFTF, ROTATEF, and
1144     ASSERT to allow "places" whose SETF methods have more than one "store
1145     variable". In such cases, the macros accept as many values from the
1146     newvalue form as there are store variables. As usual, extra values
1147     are ignored and missing values default to NIL.
1148     -- Extended the long form of DEFSETF to allow the specification of more
1149     than one "store variable", with the obvious semantics.
1150     -- GET-SETF-METHOD signals an error if there would be more than one
1151     store-variable.
1152 ram 1.3
1153 ram 1.8
1154     Printer:
1155 ram 1.3
1156 ram 1.8 Almost all of the printing code has been rewritten/restructured to support
1157     all of the printing features added to the language. Some highlights:
1158     -- *PRINT-READABLY* is now supported.
1159     -- *PRINT-CIRCLE* works irrespective of *PRINT-PRETTY*. Note: the default
1160     structure printer currently does not work when *PRINT-CIRCLE* is true: you
1161     get #1=#1#.
1162     -- *PRINT-LEVEL* abbreviation now works automatically inside structure
1163     printers.
1164     -- XP has been replaced with a native pretty printer that is fully
1165     integrated with the rest of the system. This Supports the ANSI
1166     pretty-printing interface instead of the old Waters XP interface. Existing
1167     uses of the old interface will need to be updated to use the new names.
1168     -- The pretty-printer now unparses backquote forms on printing. To retain
1169     this information, the backqoute read macro no longer expands into LIST,
1170     CONS, etc. Internal functions are used instead.
1172     been added.
1173     -- All new format. Supports the FORMATTER macro and all the pretty-printing
1174     directives. FORMAT has extended to accept a function as the format control
1175     (as an alternative to a string.)
1176     -- Added support for READTABLE-CASE in symbol printing. Printing when
1177     *PRINT-CASE* is :CAPITALIZE and *PRINT-ESCAPE* is NIL is now slightly
1178     different than before. Added some missing array type declarations in
1179     symbol printing.
1180 ram 1.3
1181     Bug fixes:
1182 ram 1.8 -- Fixed a bug which caused some float printing format directives to
1183     infinitely loop when a fixed-width field overflowed.
1184     -- Specify stream when printing unbound marker.
1185     -- Fixed FORMAT to override printer control variables when printing float
1186     exponents so that they are always printed in decimal, etc.
1187 ram 1.3
1188 ram 1.8
1189     Reader:
1190 ram 1.3
1191 ram 1.8 ANSI Cleanups:
1192     -- *READ-EVAL* is now supported. If a #. is encountered while *READ-EVAL*
1193     is NIL (default T), an error is signaled. This intended to allow
1194     ``secure'' READ-based command interfaces to be written.
1195     -- READTABLE-CASE is now supported.
1196     -- The reader now signals the correct type of error when things go wrong
1197     instead of always signaling a simple-error.
1198     -- Changed the return value of SET-SYNTAX-FROM-CHAR from NIL to T as per X3J13
1199     cleanup RETURN-VALUES-UNSPECIFIED:SPECIFY. [Hard to believe nobody has
1200     complained about not conforming to this one.]
1201 ram 1.3
1202     Bug fixes:
1203 ram 1.8 -- Fixes to several bugs with respect to #+, #-. In particular, stacked
1204     conditionals like "#+foo #-bar baz" now work
1205     -- #n= and #n# now detect more error conditions and work on structures.
1206     -- # is now a non-terminating macro character, so foo#bar is read as a
1207     symbol.
1208     -- Added Ted's changes to make INTERNAL-READ-EXTENDED-TOKEN work when there
1209     are `|' escapes. The main significance of this is that #+nil '|foo;bar|
1210     and #:|foobar| now work properly. Also changed this function to recognize
1211     unquoted colons so that #:foo:bar will error, but not #:foo\:bar.
1212 ram 1.3
1213 ram 1.8 Enhancement:
1214     -- Export new variable *ignore-extra-close-parentheses* if true (the default),
1215     extra close parens are only a warning, not an error. Previously unmatched
1216     close parens were quietly ignored.
1217 ram 1.3
1219 ram 1.8 Pathnames:
1220 ram 1.2
1221 ram 1.8 This release supports all the new CltL2 pathname features except for logical
1222     pathnames. Following is an overview of the new pathname support.
1223 ram 1.2
1224 ram 1.8 Programs that actually conform to the CLtL1 pathname spec will have very few
1225     problems. However, the CLtL1 spec was extremely vague, and CMU CL did not
1226     make use of much of the allowed flexibility, so many technically non-portable
1227     programs previously worked under CMU CL.
1228 ram 1.2
1229 ram 1.8 The main incompatible changes from CLtL1 to CLtL2:
1230     -- Symbols are no longer acceptable filenames.
1231     -- PATHNAME-HOST may be any object.
1232     -- :UNSPECIFIC is now a legal pathname component.
1233     -- MERGE-PATHNAMES now recognizes relative pathnames and treats them
1234     specially.
1235 ram 1.2
1236 ram 1.8 The format of directories is now specified (to be a list in a certain format.)
1237     This required an incompatible change from the previous practice of using a
1238     vector PATHNAME-DIRECTORY and using "DEFAULT" or :ABSOLUTE in the
1239     PATHNAME-DEVICE to indicate relative and absolute pathnames.
1240 ram 1.2
1241 ram 1.8 In a related change, the CMU SEARCH-LIST extension was changed so that the
1242     search-list now appears in the PATHNAME-DIRECTORY as:
1243     (:ABSOLUTE #<Search-list "name"> ...)
1244 ram 1.2
1245 ram 1.8 Other changes to search-lists:
1246     -- (SETF SEARCH-LIST) now accepts a string or pathname, and converts it into
1247     a one-element list.
1248     -- Search-list elements are now canonicalized to pathnames rather than to
1249     strings.
1250     -- Instead of returning NIL, SEARCH-LIST now signals an error when it is
1251     called on an undefined search list.
1252     -- SEARCH-LIST-DEFINED-P is a predicate that tells if the search list is
1253     currently defined.
1254 ram 1.2
1255 ram 1.8 New features which are now supported:
1256     -- Wildcard pathnames are now fully supported. In addition to allowing :WILD
1257     in any pathname component, "extended wildcards" such as "foo*.*" are also
1258     supported. A consequence of this is that PATTERN objects may appear in
1259     wildcard pathname components instead of strings. See PATHNAME-MATCH-P and
1261     -- As a CMU CL extension, a wildcard pathname may be used as the argument to
1262     any filesystem interface (like OPEN) as long as it matches only one file.
1263     -- The pathname :COMMON case mechanism provides a way around the problems of
1264     portably specifying string pathname components in the presence of operating
1265     systems with differing preferred case in their filesystem. An uppercase
1266     string "LISP" is mapped to the "customary case" (lowercase on unix.)
1267     Lowercase is also inverted: "readme" becomes "README". Mixed case is left
1268     alone. Note that this mechanism is explicitly enabled by supplying :CASE
1269     :COMMON to functions such as MAKE-PATHNAME. The default is the old
1270     behavior (:CASE :LOCAL).
1271 ram 1.2
1272 ram 1.8 Also, DIRECTORY now actually returns the TRUENAME of each file (as it was
1273     always supposed to do.) If a matched file is a symbolic link, the truename may
1274     be a file in some other directory that doesn't even match the pattern. The old
1275     behavior can be obtained by specifying :FOLLOW-LINKS NIL.
1276 ram 1.2
1277 ram 1.8 The new wildcard pathname mechanism has not yet been used to replace the old
1278     single-wildcard matching in Hemlock DIRED, etc.
1279 ram 1.2
1280 ram 1.8
1281     Debugger:
1282     -- Added Miles' changes to keep errors and warnings on one line if they fit.
1283     -- The debugger now starts up with the error frame as the current frame, so
1284     it is no longer necessary to manually skip over internal frames resulting
1285     from the error system invocation.
1286     -- Fixed some debugger bugs that appeared when debugging interpreted code.
1287     -- Added ``DESCRIBE'' debugger command.
1288     -- Merged Miles' changes that allow the use of restart names as debugger
1289     commands.
1290     -- Changed SHOW-RESTARTS to also display the restart name (but only if it's
1291     not shadowed by a higher priority restart). Changed the restart command
1292     to look for restarts by name if a symbol is typed.
1293     -- Bind *CURRENT-LEVEL* to 0, *PRINT-READABLY* to nil, and *READ-EVAL* to T
1294     when entering the debugger to make sure things print as expected.
1295 ram 1.2
1296 ram 1.8 The debugger programmer (DEBUG-INTERNALS) interface is now documented in the
1297     User's Manual. This interface allows the coding of debuggers and debugger
1298     extensions without requiring an intimate understanding of the compiler and
1299     run-time system. Be warned that DI features (such as breakpoints) not used by
1300     the current debugger may not work very well (wait for version 17.)
1301 ram 1.2
1302 ram 1.8 Debug internals changes:
1303     -- DI:DEBUG-FUNCTION-FUNCTION is now implemented.
1304     -- Added DI:FLUSH-FRAMES-ABOVE for cleaning up frames to be bound to
1306 ram 1.2
1307 ram 1.8
1308     Defstruct:
1309 ram 1.2
1310 ram 1.8 Various fixes and enhancements to defstruct slot parsing and inclusion.
1311     It now works to define structures such as:
1312     (defstruct super a)
1313     (defstruct (sub1 (:conc-name super)) one)
1314     (defstruct (sub2 (:conc-name super)) two)
1315     (super-a (make-sub1))
1316 ram 1.2
1317 ram 1.8 previously, a definition such as for SUB2 would define SUPER-A to be a
1318     SUB2-specific function, which could then no longer be used on other types. The
1319     spec doesn't clearly say that such a construct is legal, but its use seems
1320     fairly common.
1321 ram 1.2
1322 ram 1.8 Also, slot parsing is now more rigorous. Unrecognized slot options cause an
1323     error, as does a slot spec like: (defstruct foo (a :type t))
1324 ram 1.2
1325 ram 1.8 Fasl dumping of constant structures has been fixed to conform to X3J13. The
1326     main significance of this is that DEFSTRUCT structures are no longer dumpable
1327     by default. However, the generic function MAKE-LOAD-FORM isn't really used.
1328     Instead, a new defstruct option, :MAKE-LOAD-FORM-FUN, has been added that can
1329     be used to specify a function that acts like a MAKE-LOAD-FORM method. When we
1330     have a CLOS that supports STRUCTURE-CLASS, the default method for
1331     MAKE-LOAD-FORM will use this information instead of having the compiler use it
1332     directly. The old behavior can be enabled on a structure by structure basis by
1333     using the :MAKE-LOAD-FORM-FUN defstruct option:
1334     (defstruct (foo (:make-load-form-fun :just-dump-it-normally))
1335     ...)
1336 ram 1.2
1338 ram 1.8 Compiler:
1339 ram 1.1
1340 ram 1.8 Cleanups:
1341     -- Added the LOAD-TIME-VALUE support special form.
1342     -- Displaced or adjustable arrays and vectors with fill pointers can now be
1343     dumped in fasl files, but are converted to simple array with the same
1344     elements.
1345     -- Arrays of floats are left as arrays of floats instead of being
1346     converted into arrays of element-type T that just so happen to hold a
1347     bunch of floats.
1348     -- Changed IGNORE and IGNORABLE to recognize #'fn-name for declaring that
1349     local functions are not used. Exported IGNORABLE from LISP.
1350 ram 1.1
1351 ram 1.8 New optimizations:
1352     -- Iterations written using tail recursion are now optimized through a
1353     special-casing of local functions where all calls but one are
1354     tail-recursive self-calls. Such functions are compiled with no
1355     environment manipulation, resulting in the same code as explicit
1356     iteration.
1357     -- Loop rotation (Knuth "while" loop optimization) been added. This is the
1358     optimization that negates the loop exit test and places it at the end of
1359     the loop, and then jumps there at loop entry. Note that this is part of
1360     control optimization, and not simply a recoding of certain iteration
1361     macros. In fact, for historical reasons DO, etc. already had the exit
1362     test negated, but the compiler was cleverly un-negating the test.
1363     -- Flow analysis now recognizes function calls and special forms which do
1364     not yield any value because they unwind or signal an error. This results
1365     in improved code for error checks, since the compiler can get by with
1366     fewer unconditional branches. A function can be declared not to return by
1367     declaring its result type to be NIL (not to be confused with NULL). If a
1368     function declared NIL does return, an error will be signalled.
1369     -- Added derive-type methods for ASIN, ACOS, ACOSH, ATANH and SQRT which
1370     figure out whether the result type is real on the basis of the argument
1371     range. Also, the result of ATAN is always real, so we don't need a result
1372     type assertion.
1373     -- Added optimization which deletes MULTIPLE-VALUE-BINDs when all
1374     variables have been deleted.
1375     -- Eliminated some spurious checking of the result types of safe VOPs (such
1376     as the SPARC tadd for fixnum arithmetic.)
1377     -- Transform uses of the SEARCH generic sequence function on simple strings
1378     into a call to a more efficient string-specific function.
1379     -- Added multiplier recoding of (UNSIGNED-BYTE 32) multiplication. This
1380     converts 32 bit (or smaller) unsigned multiplication by any compile-time
1381     constant into a shift-add sequence. This is much faster when the constant
1382     is a near power of two or when general multiplication is slow (as on the
1383     SPARC.)
1384     -- Added comprehensive handling of arithmetic and logical identities when
1385     an arg is -1, 0 or +1.
1386     -- Added a RANDOM derive-type method: (random 13) is (integer 0 12).
1387 ram 1.1
1389     Enhancements:
1390 ram 1.8 -- Changed the compiler to temporarily increase *BYTES-CONSED-
1391     BETWEEN-GCS* by a factor of 4 during compilation of each top-level form,
1392     instead of turning off all garbage collection.
1393     -- Bind *PRINT-LINES* around compiler error output to
1395     -- Do not warn about undefined variables, functions or types when the
1396     INHIBIT-WARNINGS OPTIMIZE quality is 3.
1397     -- Some optimizations are now considered "important"; failure of important
1398     optimizations causes an efficiency note even when speed=inhibit-warnings
1399     (i.e. by default.)
1400     -- Print a error summary even when *COMPILE-VERBOSE* is false. (This is only
1401     printed when there are errors, so this doesn't seem a violation of the
1402     spirit of the spec.)
1403 ram 1.1
1404     Bug fixes:
1405 ram 1.8 -- Merged Miles' fix to disassembly of the MIPS coprocessor move instructions.
1406     -- Fixed spelling of "efficency" in exported variables such as
1408     -- Fixed some cases where incomplete optimization could happen.
1409     -- Fixed some arithmetic "identities" that failed to preserve the sign of
1410     -0.0.
1411     -- Fixed TYPES-INTERSECT to consider any supertype of T to definitely
1412     intersect with anything (even an unknown type.)
1413     -- Fixed a problem where inconsistent declarations could fail to be detected
1414     at compile time.
1415     -- Fixed the VALUES transform (which discards unused subforms) to work
1416     on (VALUES).
1417     -- More bug fixes to dead code deletion.
1418     -- Fixed a problem where a special binding would not be removed on exit from
1419     the scope if there was no code in the scope (e.g. it had all been
1420     deleted.)
1421     -- Fixed handling of named (DEFCONSTANT) constants so that EQ
1422     relationships are properly preserved.
1423 ram 1.1
1424 ram 1.8
1425     Extensions:
1426 ram 1.1
1427 ram 1.8 -- Export FEATUREP from EXT. This takes a feature expression and tests it
1428     against the value of *FEATURES*. Allow LISP:AND, LISP:OR, and LISP:NOT in
1429     features lists in addition to :AND, :OR, and :NOT. This makes featurep
1430     useful outside of #+ and #-.
1431     -- The encapsulation mechanism (similar to advise facilities) has been
1432     revamped to work on SETF function names as well as symbols.
1434     Returns whatever definition is stored for name, regardless of whether
1435     it is encapsulated. Unlike FDEFINITION, this does not strip off the
1436     encapsulation. This is SETF'able.
1438     Replaces the definition of name with a function that binds name's
1439     arguments a variable named argument-list, binds name's definition to a
1440     variable named basic-definition, and EVAL's body in that context. Type
1441     is whatever you would like to associate with this encapsulation for
1442     identification in case you need multiple encapsuations of the same
1443     name.
1445     Removes name's most recent encapsulation of the specified type.
1447     Returns t if name has an encapsulation of the given type, otherwise
1448     nil.
1450     A list of functions invoked by (SETF FDEFINITION) before storing the
1451     new value. Each hook function must take the function name and the
1452     new-value.
1453 ram 1.1
1454     Hemlock:
1455 ram 1.8 -- Fixed the :FILE branch of "Help on Parse" to trim leading directory
1456     components off the pathname if it wouldn't otherwise fit on the screen.
1457     -- Fixed GET-EDITOR-TTY-INPUT to not assume that UNIX-READ will always work.
1458     -- When we reallocate string table vectors to grow them, clear the old vector
1459     so that it won't hold onto garbage (in case the vector was in static space,
1460     but pointed to dynamic values.) This was a major cause of memory leakage
1461     in Hemlock.
1462     -- Added a (setf (ts-stream-char-pos stream) 0) to the accept-input function
1463     so that char-pos will be reset to zero whenever the user presses enter.
1464 ram 1.1
1465 ram 1.8 PCL:
1466     -- The version has been updated to "5/1/90 May Day PCL (REV 4b)".
1467     -- The Code walker now understands the real SYMBOL-MACROLET, and the PCL macro
1468     definition is no longer used.
1469     -- Fixed a bug in WALK-ARGLIST where it would ignore the rest of the current
1470     arglist if the current arg destructured. This was causing it to compile
1471     forms like:
1472     (macrolet ((foo ((a b) c) ...)) ...)
1473     as:
1474     (macrolet ((foo ((a b)) ...)) ...)
1475     note the loss of the arg c.
1476 ram 1.1
1477 ram 1.8
1478     System:
1479 ram 1.1
1480 ram 1.8 -- All the SAP-REF-<n> functions now take byte offsets. Previously, the
1481     16 and 32bit versions were scaled by the element size.
1482     -- Fixed UNIX-IOCTL to not flame out of the cmd is a ub-32 instead of a sb-32.
1484     -- Unix syscalls are now more restrictive in the kind of arguments that they
1485     accept. In particular, UNIX:UNIX-READ, etc., no longer automatically
1486     accept a vector (or string) argument. You must use VECTOR-SAP to convert
1487     the vector to a system area pointer. Note that WITHOUT-GCING should be
1488     wrapped around any syscall which is passed a pointer to the Lisp heap,
1489     since the object might otherwise move doing the syscall.
1490     -- Changed LOAD-FOREIGN to be exported from ALIEN. Changed it have keyword
1491     args instead of optionals. Deleted obsolete linker argument.

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