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[smlnj] Annotation of /sml/trunk/HISTORY
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Annotation of /sml/trunk/HISTORY

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1 : dbm 570 This is the HISTORY file for the Yale SML/NJ CVS repository.
2 :    
3 :     An entry should be made for _every_ commit to the repository.
4 :     The entries in this file will be used when creating the README
5 :     for new versions, so keep that in mind when writing the
6 :     description.
7 :    
8 :     The form of an entry should be:
9 :    
10 :     Name:
11 :     Date:
12 :     Tag: <post-commit CVS tag>
13 :     Description:
14 : leunga 591 ----------------------------------------------------------------------
15 : blume 675 Name: Matthias Blume
16 : blume 677 Date: 2000/06/26 09:56:46 JST
17 :     Tag: blume-20000626-setup
18 :     Description:
19 :    
20 :     CM: - setup-parameter to "sml" added; this can be used to run arbitrary
21 :     ML code before and after compiling a file (e.g., to set compiler
22 :     flags)
23 :    
24 :     Compiler: - improved btrace API (in core.sml, internals.{sig,sml})
25 :     - associated changes to btrace.sml (BTrace instrumentation pass)
26 :     - cleaner implementation of btimp.sml (BTrace tracing and report
27 :     module)
28 :    
29 :     CM manual: * new path encoding documented
30 :     * description of setup-parameter to "sml" added
31 :    
32 :     The biggest user-visible change to back-tracing is that it is no
33 :     longer necessary to compile all traced modules within the same
34 :     session. (This was a real limitation.)
35 :    
36 :     ----------------------------------------------------------------------
37 :     Name: Matthias Blume
38 : blume 676 Date: 2000/06/24 12:40:00 JST
39 :     Tag: blume-20000624-startup
40 :     Description:
41 :    
42 :     Fixes startup slowdown problem. (I was calling SrcPath.sync a _tad_
43 :     bit too often -- to put it mildly. :)
44 :    
45 :     ----------------------------------------------------------------------
46 :     Name: Matthias Blume
47 : blume 675 Date: 2000/06/23 18:20:00 JST
48 :     Tag: blume-20000623-btrace
49 :     Description:
50 :    
51 :     This updates adds a backtrace facility to aid programmers in debugging
52 :     their programs. This involves the following changes:
53 :    
54 :     1. Module system/smlnj/init/core.sml (structure _Core) now has hooks for
55 :     keeping track of the current call stack. When programs are compiled
56 :     in a special mode, the compiler will insert calls to these hooks
57 :     into the user program.
58 :     "Hook" means that it is possible for different implementations of
59 :     back-tracing to register themselves (at different times).
60 :    
61 :     2. compiler/MiscUtil/profile/btrace.sml implements the annotation phase
62 :     as an Absyn.dec->Absyn.dec rewrite. Normally this phase is turned off.
63 :     It can be turned on using this call:
64 :     SMLofNJ.Internals.BTrace.mode (SOME true);
65 :     Turning it off again:
66 :     SMLofNJ.Internals.BTrace.mode (SOME false);
67 :     Querying the current status:
68 :     SMLofNJ.Internals.BTrace.mode NONE;
69 :     Annotated programs are about twice as big as normal ones, and they
70 :     run a factor of 2 to 4 slower with a dummy back-trace plugin (one
71 :     where all hooks do nothing). The slowdown with a plugin that is
72 :     actually useful (such as the one supplied by default) is even greater,
73 :     but in the case of the default plugin it is still only an constant
74 :     factor (amortized).
75 :    
76 :     3. system/Basis/Implementation/NJ/internals.{sig,sml} have been augmented
77 :     with a sub-structure BTrace for controlling back-tracing. In particular,
78 :     the above-mentioned function "mode" controls whether the annotation
79 :     phase is invoked by the compiler. Another important function is
80 :     "trigger": when called it aborts the current execution and causes
81 :     the top-level loop to print a full back-trace.
82 :    
83 :     4. compiler/MiscUtil/profile/btimp.sml is the current default plugin
84 :     for back-tracing. It keeps track of the dynamic call stack and in
85 :     addition to that it keeps a partial history at each "level" of that
86 :     stack. For example, if a tail-calls b, b tail-calls c, and c tail-calls
87 :     d and b (at separate times, dynamically), then the report will show:
88 :    
89 :     GOTO d
90 :     /c
91 :     GOTO \b
92 :     CALL a
93 :    
94 :     This shows that there was an initial non-tail call of a, then a
95 :     tail-call to b or c, looping behavior in a cluster of functions that
96 :     consist of b and c, and then a goto from that cluster (i.e., either from
97 :     b or from c) to d.
98 :    
99 :     Note that (depending on the user program) the amount of information
100 :     that the back-trace module has to keep track of at each level is bounded
101 :     by a constant. Thus, the whole implementation has the same asymptotical
102 :     complexity as the original program (both in space and in time).
103 :    
104 :     5. compiler/TopLevel/interact/evalloop.sml has been modified to
105 :     handle the special exception SMLofNJ.Internals.BTrace.BTrace
106 :     which is raised by the "trigger" function mentioned above.
107 :    
108 :     Notes on usage:
109 :    
110 :     - Annotated code works well together with unannotated code:
111 :     Unannotated calls simply do not show up at all in the backtrace.
112 :    
113 :     - It is not a good idea to let modules that were annotated during
114 :     different sessions run at the same time. This is because the compiler
115 :     chooses small integers to identify individual functions, and there
116 :     will be clashes if different modules were compiled in separate sessions.
117 :     (Nothing will crash, and you will even be told about the clashes, but
118 :     back-trace information will in general not be useful.)
119 :    
120 :     - Back-tracing can be confused by callcc and capture.
121 :    
122 :     - The only way of getting a back-trace right now is to explicitly
123 :     invoke the "trigger" function from your user program. Eventually, we
124 :     should make every exception carry back-trace information (if
125 :     available). But since this creates more overhead at "raise"-time
126 :     (similar to the current exnHistory overhead), I have not yet
127 :     implemented this. (The implementation will be rather easy.) With
128 :     exceptions carrying back-trace information, this facility will be even
129 :     more useful because users don't need to modify their programs...
130 :    
131 :     - While it is possible to compile the compiler with back-trace
132 :     annotations turned on (I did it to get some confidence in
133 :     correctness), you must make absolutely sure that core.sml and
134 :     btimp.sml are compiled WITHOUT annotation! (core.sml cannot actually
135 :     be compiled with annotation because there is no core access yet, but
136 :     if you compile btimp.sml with annotation, then the system will go into
137 :     an infinite recursion and crash.)
138 :     Since CM currently does not know about BTrace, the only way to turn
139 :     annotations on and off for different modules of the compiler is to
140 :     interrupt CMB.make, change the settings, and re-invoke it. Of course,
141 :     this is awkward and clumsy.
142 :    
143 :     Sample sessions:
144 :    
145 :     Standard ML of New Jersey v110.28.1 [FLINT v1.5], June 5, 2000
146 :     - SMLofNJ.Internals.BTrace.mode (SOME true);
147 :     [autoloading]
148 :     [autoloading done]
149 :     val it = false : bool
150 :     - structure X = struct
151 :     - fun main n = let
152 :     - fun a (x, 0) = d x
153 :     - | a (x, n) = b (x, n - 1)
154 :     - and b (x, n) = c (x, n)
155 :     - and c (x, n) = a (x, n)
156 :     - and d x = e (x, 3)
157 :     - and e (x, 0) = f x
158 :     - | e (x, n) = e (x, n - 1)
159 :     - and f 0 = SMLofNJ.Internals.BTrace.trigger ()
160 :     - | f n = n * g (n - 1)
161 :     - and g n = a (n, 3)
162 :     - in
163 :     - f n
164 :     - end
165 :     - end;
166 :     structure X : sig val main : int -> int end
167 :     - X.main 3;
168 :     *** BACK-TRACE ***
169 :     GOTO stdIn:4.2-13.20: X.main[2].f
170 :     GOTO-( stdIn:4.2-13.20: X.main[2].e
171 :     GOTO stdIn:4.2-13.20: X.main[2].d
172 :     / stdIn:4.2-13.20: X.main[2].a
173 :     | stdIn:4.2-13.20: X.main[2].b
174 :     GOTO-\ stdIn:4.2-13.20: X.main[2].c
175 :     CALL stdIn:4.2-13.20: X.main[2].g
176 :     GOTO stdIn:4.2-13.20: X.main[2].f
177 :     GOTO-( stdIn:4.2-13.20: X.main[2].e
178 :     GOTO stdIn:4.2-13.20: X.main[2].d
179 :     / stdIn:4.2-13.20: X.main[2].a
180 :     | stdIn:4.2-13.20: X.main[2].b
181 :     GOTO-\ stdIn:4.2-13.20: X.main[2].c
182 :     CALL stdIn:4.2-13.20: X.main[2].g
183 :     GOTO stdIn:4.2-13.20: X.main[2].f
184 :     GOTO-( stdIn:4.2-13.20: X.main[2].e
185 :     GOTO stdIn:4.2-13.20: X.main[2].d
186 :     / stdIn:4.2-13.20: X.main[2].a
187 :     | stdIn:4.2-13.20: X.main[2].b
188 :     GOTO-\ stdIn:4.2-13.20: X.main[2].c
189 :     CALL stdIn:4.2-13.20: X.main[2].g
190 :     GOTO stdIn:4.2-13.20: X.main[2].f
191 :     CALL stdIn:2.15-17.4: X.main[2]
192 :     -
193 :    
194 :     (Note that because of a FLINt bug the above code currently does not
195 :     compile without BTrace turned on.)
196 :    
197 :     Here is another example, using my modified Tiger compiler:
198 :    
199 :     Standard ML of New Jersey v110.28.1 [FLINT v1.5], June 5, 2000
200 :     - SMLofNJ.Internals.BTrace.mode (SOME true);
201 :     [autoloading]
202 :     [autoloading done]
203 :     val it = false : bool
204 :     - CM.make "sources.cm";
205 :     [autoloading]
206 :     ...
207 :     [autoloading done]
208 :     [scanning sources.cm]
209 :     [parsing (sources.cm):parse.sml]
210 :     [creating directory CM/SKEL ...]
211 :     [parsing (sources.cm):tiger.lex.sml]
212 :     ...
213 :     [wrote CM/sparc-unix/semant.sml]
214 :     [compiling (sources.cm):main.sml]
215 :     [wrote CM/sparc-unix/main.sml]
216 :     [New bindings added.]
217 :     val it = true : bool
218 :     - Main.compile ("../testcases/merge.tig", "foo.out");
219 :     *** BACK-TRACE ***
220 :     CALL lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trvar
221 :     CALL lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
222 :     CALL lib/semant.sml:289.3-295.22: SemantFun[2].transExp.trexp.check[2]
223 :     GOTO lib/semant.sml:289.3-295.22: SemantFun[2].transExp.trexp.check[2]
224 :     CALL lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
225 :     CALL lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
226 :     CALL lib/semant.sml:488.3-505.6: SemantFun[2].transDec.trdec[2].transBody[2]
227 :     / lib/semant.sml:411.65-543.8: SemantFun[2].transDec
228 :     CALL-\ lib/semant.sml:413.2-540.9: SemantFun[2].transDec.trdec[2]
229 :     CALL lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
230 :     CALL lib/semant.sml:8.52-558.4: SemantFun[2].transProg[2]
231 :     CALL main.sml:1.18-118.4: Main.compile[2]
232 :     -
233 :    
234 :     ----------------------------------------------------------------------
235 : blume 673 Name: Matthias Blumen
236 :     Date: 2000/06/21 18:00:00 JST
237 :     Tag: blume-20000621-manual
238 :     Description:
239 :    
240 :     CM manual update: Path environments documented.
241 :    
242 :     ----------------------------------------------------------------------
243 : blume 666 Name: Matthias Blume
244 : blume 672 Date: 2000/06/19 13:40:00
245 :     Tag: blume-20000619-manual
246 :     Description:
247 :    
248 :     CM manual and system/README update. This only covers the fact that
249 :     there are no more implicit anchors. (Path environments and the "bind"
250 :     option to "cm" have yet to be documented.)
251 :    
252 :     ----------------------------------------------------------------------
253 :     Name: Matthias Blume
254 : blume 671 Date: 2000/06/19 11:05:00 JST
255 :     Tag: blume-20000619-chdir-bugfix
256 :     Description:
257 :    
258 :     Fixed a bug in new SrcPath module that sometimes led to a bad chDir call.
259 :    
260 :     ----------------------------------------------------------------------
261 :     Name: Matthias Blume
262 : blume 670 Date: 2000/06/18 22:00:10 JST
263 :     Tag: blume-20000618-implicit-anchors-really-gone
264 :     Description:
265 :    
266 :     I updates the previous HISTORY entry where I forgot to mention that
267 :     implicit anchors are no longer with us.
268 :    
269 :     The current update also gets rid of the (now useless) controller
270 :     CM.Control.implicit_anchors.
271 :    
272 :     ----------------------------------------------------------------------
273 :     Name: Matthias Blume
274 : blume 666 Date: 2000/06/16 17:30:00 JST
275 :     Tag: blume-20000616-anchorenv
276 :     Description:
277 :    
278 :     This patch implements the long anticipated (just kidding :) "anchor
279 :     environment" mechanism. In the course of doing this, I also
280 :     re-implemented CM's internal "SrcPath" module from scratch. The new
281 :     one should be more robust in certain boundary cases. In any case, it
282 :     is a lot cleaner than its predecessor (IMHO).
283 :    
284 :     This time, although there is yet another boot file format change, I
285 :     kept the unpickler backward-compatible. As a result, no new bootfiles
286 :     are necessary and bootstrapping is straightforward. (You cannot read
287 :     new bootfiles into an old system, but the other way around is no
288 :     problem.)
289 :    
290 :     Visible changes:
291 :    
292 : blume 670 ** 0. Implicit path anchors (without the leading $-symbol) are no
293 :     longer recognized at all. This means that such path names are not
294 :     illegal either. For example, the name basis.cm simply refers to a
295 :     local file called "basis.cm" (i.e, the name is an ordinary path
296 :     relative to .cm-files directory). Or, to put it differently, only
297 :     names that start with $ are anchored paths.
298 : blume 666
299 : blume 670 ** 1. The $<singlearc> abbreviation for $/<singlearc> has finally
300 :     vanished.
301 :    
302 :     John (Reppy) had critizised this as soon as I originally proposed and
303 : blume 666 implemented it, but at that time I did not really deeply believe
304 :     him. :) Now I came full-circle because I need the $<singlearc> syntax
305 :     in another place where it cannot be seen as an abbreviation for
306 :     $/<singlearc>. To avoid the confusion, $<singlearc> now means what it
307 :     seems to mean (i.e., it "expands" into the corresponding anchor
308 :     value).
309 :    
310 :     However, when paths are used as members in CM description files, it
311 :     continues to be true that there must be at least another arc after the
312 :     anchor. This is now enforced separately during semantic analysis
313 : blume 670 (i.e., from a lexical/syntactical point of view, the notation is ok.)
314 : blume 666
315 :     ** 2. The "cm" class now accepts an option "bind". The option's value
316 :     is a sub-option list of precisely two items -- one labeled "anchor"
317 :     and the other one labeled "value". As you might expect, "anchor" is
318 :     used to specify an anchor name to be bound, and "value" specifies what
319 :     the anchor is being bound to.
320 :    
321 :     The value must be a directory name and can be given in either standard
322 :     syntax (including the possibility that it is itself an anchored path)
323 :     or native syntax.
324 :    
325 :     Examples:
326 :    
327 :     foo.cm (bind:(anchor:bar value:$mystuff/bar))
328 :     lib.cm (bind:(anchor:a value:"H:\\x\\y\\z")) (* only works under windows *)
329 :    
330 :     and so on.
331 :    
332 :     The meaning of this is that the .cm-file will be processed with an
333 :     augmented anchor environment where the given anchor(s) is/are bound to
334 :     the given values(s).
335 :    
336 :     The rationale for having this feature is this: Suppose you are trying
337 :     to use two different (already stable) libraries a.cm and b.cm (that
338 :     you perhaps didn't write yourself). Further, suppose each of these
339 :     two libraries internally uses its own auxiliary library $aux/lib.cm.
340 :     Normally you would now have a problem because the anchor "lib" can not
341 :     be bound to more than one value globally. Therefore, the project that
342 :     uses both a.cm and b.cm must locally redirect the anchor to some other
343 :     place:
344 :    
345 :     a.cm (bind:(anchor:lib value:/usr/lib/smlnj/a-stuff))
346 :     b.cm (bind:(anchor:lib value:/usr/lib/smlnj/b-stuff))
347 :    
348 :     This hard-wires $lib/aux.cm to /usr/lib/smlnj/a-stuff/aux.cm or
349 :     /usr/lib/smlnj/b-stuff/aux.cm, respectively.
350 :    
351 :     Hard-wiring path names is a bit inflexible (and CM will verbosely warn
352 :     you when you do so at the time of CM.stabilize). Therefore, you can
353 :     also use an anchored path as the value:
354 :    
355 :     a.cm (bind:(anchor:lib value:$a-lib))
356 :     b.cm (bind:(anchor:lib value:$b-lib))
357 :    
358 :     Now you can globally configure (using the usual CM.Anchor.anchor or
359 :     pathconfig machinery) bindings for "a-lib" and "b-lib". Since "lib"
360 :     itself is always locally bound, setting it globally is no longer
361 :     meaningful or necessary (but it does not hurt either). In fact, "lib"
362 :     can still be used as a global anchor for separate purposes. As a
363 :     matter of fact, one can locally define "lib" in terms of a global
364 :     "lib":
365 :    
366 :     a.cm (bind:(anchor:lib value:$lib/a))
367 :     b.cm (bind:(anchor:lib value:$lib/b))
368 :    
369 :     ** 3: The encoding of path names has changed. This affects the way
370 :     path names are shown in CM's progress report and also the internal
371 :     protocol encoding used for parallel make.
372 :    
373 :     The encoding now uses one or more ':'-separated segments. Each
374 :     segments corresponds to a file that has been specified relative to the
375 :     file given by its preceding segment. The first segment is either
376 :     relative to the CWD, absolute, or anchored. Each segment itself is
377 :     basically a Unix pathname; all segments but the first are relative.
378 :    
379 :     Example:
380 :    
381 :     $foo/bar/baz.cm:a/b/c.sml
382 :    
383 :     This path denotes the file bar/a/b/c.sml relative to the directory
384 :     denoted by anchor "foo". Notice that the encoding also includes
385 :     baz.cm which is the .cm-file that listed a/b/c.sml. As usual, such
386 :     paths are resolved relative to the .cm-files directory, so baz.cm must
387 :     be ignored to get the "real" pathname.
388 :    
389 :     To make this fact more obvious, CM puts the names of such "virtual
390 :     arcs" into parentheses when they appear in progress reports. (No
391 :     parentheses will appear in the internal protocol encoding.) Thus,
392 :     what you really see is:
393 :    
394 :     $foo/bar/(baz.cm):a/b/c.sml
395 :    
396 :     I find this notation to be much more informative than before.
397 :    
398 :     Another new feature of the encoding is that special characters
399 :     including parentheses, colons, (back)slashes, and white space are
400 :     written as \ddd (where ddd is the decimal encoding of the character).
401 :    
402 : blume 670 *** The CM manual still needs to be updated.
403 :    
404 : blume 666 ----------------------------------------------------------------------
405 : leunga 660 Name: Allen Leung
406 :     Date: 2000/06/15 00:38:00
407 :     Tag: leunga-20000615-x86-peephole
408 :    
409 :     x86 Peephole fix by Fermin. Affects c-- and moby only.
410 :    
411 :     ----------------------------------------------------------------------
412 : blume 658 Name: Matthias Blume
413 :     Date: 2000/06/12 11:40:00
414 :     Tag: blume-20000612-parmakefix
415 :     Description:
416 :    
417 :     More cleanup after changing the file naming scheme: This time I
418 :     repaired the parallel make mechanism for CMB.make which I broke earlier.
419 :    
420 :     ----------------------------------------------------------------------
421 : leunga 657 Name: Allen Leung
422 :     Date: 2000/06/09 01:25:00
423 :     Tag: leunga-20000609-various
424 :    
425 :     None of these things should affect normal SML/NJ operations
426 :    
427 :     1. Peephole improvements provided by Fermin (c--)
428 :     2. New annotation DEFUSE for adding extra dependence (moby)
429 :     3. New X86 LOCK instructions (moby)
430 :     4. New machine description language for reservation tables (scheduling)
431 :     5. Fixes to various optimization/analysis modules (branch chaining, dominator
432 :     trees etc.)
433 :     6. I've changed the CM files so that they can work with versions
434 :     110.0.6, 110.25 and 110.28
435 :    
436 :     ----------------------------------------------------------------------
437 : blume 652 Name: Matthias Blume
438 : blume 656 Date: 2000/06/09 12:40:00
439 :     Tag: blume-20000609-log
440 :     Description:
441 :    
442 :     - Removed all(?) remaining RCS Log entries from sources.
443 :    
444 :     - Fixed bug in ml-yacc and ml-lex sources (use explicit anchors for
445 :     anchored paths).
446 :    
447 :     ----------------------------------------------------------------------
448 :     Name: Matthias Blume
449 : blume 653 Date: 2000/06/07 17:00:00 JST
450 :     Tag: blume-20000607-no-implicit-anchors
451 :     Description:
452 :    
453 :     1. This update changes the default setting for
454 :     CM.Control.implicit_anchors from true to false. This means that
455 :     implicit anchors are no longer permitted by default. I also tried to
456 :     make sure that nothing else still relies on implicit anchors.
457 :     (This is the next step on the schedule towards a CM that does not even
458 :     have the notion of implicit anchors anymore.)
459 :    
460 :     2. More CM manual updates.
461 :    
462 :     3. I managed to track down and fix the pickling bug I mentioned last
463 :     time. Because of the previously existing workaround, this entails no
464 :     immediate practical changes.
465 :    
466 :     ----------------------------------------------------------------------
467 :     Name: Matthias Blume
468 : blume 652 Date: 2000/06/06 11:15:00 JST
469 :     Tag: blume-20000606-lazierpickle
470 :     Description:
471 :    
472 :     !!!! NEW BOOT FILES !!!!
473 :    
474 :     * The main purpose of this update is to make library pickles lazier in
475 :     order to reduce the initial space penalty for autoloading a library.
476 :     As a result, it is now possible to have $smlnj/compiler.cm
477 :     pre-registered. This should take care of the many complaints or
478 :     inquiries about missing structure Compiler. This required changes to
479 :     CM's internal data structures and small tweaks to some algorithms.
480 :    
481 :     As a neat additional effect, it is no longer necessary (for the sake
482 :     of lean heap image files) to distinguish between a "minimal" CM and a
483 :     "full" CM. Now, there is only one CM (i.e., the "full" version:
484 :     $smlnj/cm.cm aka $smlnj/cm/full.cm), and it is always available at the
485 :     interactive top level. ($smlnj/cm/minimal.cm is gone.)
486 :    
487 :     To make the life of compiler-hackers easier, "makeml" now also
488 :     pre-registers $smlnj/cmb.cm (aka $smlnj/cmb/current.cm). In other
489 :     words, after you bootstrap a new sml for the first time, you will not
490 :     have to autoload $smlnj/cmb.cm again afterwards. (The first time
491 :     around you will still have to do it, though.)
492 :    
493 :     * A second change consists of major updates to the CM manual. There
494 :     are now several appendices with summary information and also a full
495 :     specification of the CM description file syntax.
496 :    
497 :     * In directory src/system I added the script "allcross". This script
498 :     invokes sml and cross-compiles the compiler for all supported
499 :     architectures. (Useful when providing a new set of boot files.)
500 :    
501 :     * There seems to be a latent bug in my "lazy pickles" mechanism. I
502 :     added a small tweak to pickle-util.sml to work around this problem,
503 :     but it is not a proper fix yet. I will investigate further. (The
504 :     effect of the bug was an inflation of library pickle size.)
505 :    
506 :     * Version number increased to 110.28.1 (to avoid compatibility problems).
507 :    
508 :     ----------------------------------------------------------------------
509 : leunga 646 Name: Allen Leung
510 : leunga 648 Date: 2000/05/25 17:28 EDT
511 :     Tag: leunga-20000525-ra
512 :     Description:
513 :    
514 :     Fixed a bug in freezing phase of the register allocator.
515 :    
516 :     ----------------------------------------------------------------------
517 :     Name: Allen Leung
518 : leunga 647 Date: 2000/05/15 22:53 EDT
519 : leunga 646 Tag: leunga-20000515-alpha-x86-ra
520 :     Description:
521 :    
522 :     1. Alpha
523 :    
524 :     Slight cleanup. Removed the instruction SGNXL
525 :    
526 :     2. X86
527 :    
528 :     Added the following instructions to the instruction set:
529 :    
530 :     ROLx, RORx,
531 :     BTx, BTSx, BTLx, BTRx,
532 :     XCHGx, and variants with the LOCK prefix
533 :    
534 :     3. Register Allocation
535 :    
536 :     The module ra-rewrite-with-renaming has been improved.
537 :    
538 : leunga 647 These have no effect on SML/NJ.
539 :    
540 : leunga 646 ----------------------------------------------------------------------
541 : blume 642 Name: Matthias Blume
542 : blume 645 Date: 2000/05/15 16:20:00 JST
543 :     Tag: blume-20000515-lightrebuild
544 :     Description:
545 :    
546 :     1. I added an alternative to "-rebuild" to "makeml". The difference is
547 :     that prior to calling CMB.make' the CM-variable "LIGHT" will be
548 :     defined. In effect, the command will not build any cross-compiler
549 :     backends and therefore finish more quickly.
550 :    
551 :     The "fixpt" script also takes a "-light" switch to be able to use
552 :     this new facility while compiling for a fixpoint.
553 :    
554 :     2. I replaced all mentions of anchored paths in group owner specifications
555 :     with simple relative paths (usually starting with "..").
556 :     The rationale is that a library's internal workings should not be
557 :     compromised by the lack of some anchor. (An anchor is necessary
558 :     for someone who wants to refer to the library by an anchored path,
559 :     but it should not be necessary to build the same library in the first
560 :     place.)
561 :    
562 :     3. I changed the way CM's tool mechanism determines the shell command
563 :     string used for things like ml-yacc etc. so that it does not break
564 :     when CM.Control.implicit_anchors is turned off.
565 :    
566 :     ----------------------------------------------------------------------
567 :     Name: Matthias Blume
568 : blume 644 Date: 2000/05/12 18:20:00 JST
569 :     Tag: blume-20000512-ml-build
570 :     Description:
571 :    
572 :     Fixed a bug in config/_ml-build that prevented ml-yacc and ml-lex from
573 :     getting installed properly (by config/install.sh).
574 :    
575 :     ----------------------------------------------------------------------
576 :     Name: Matthias Blume
577 : blume 643 Date: 2000/05/12 17:30:00 JST
578 :     Tag: blume-20000512-anchors
579 :     Description:
580 :    
581 :     !!! NEW BOOT FILES !!!
582 :    
583 :     This change is in preparation of fading out support for "implicitly
584 :     anchored path names". I went through all sources and used the
585 :     explicit (and relatively new) $-notation. See system/README and the
586 :     CM manual for more info on this.
587 :    
588 :     I also modified the anchoring scheme for some things such as "smlnj",
589 :     "MLRISC", "cm", etc. to take advantage of the fact that explicit
590 :     anchors are more expressive: anchor name and first arc do not have to
591 :     coincide. This entails the following user-visible change:
592 :    
593 :     You have to write $smlnj/foo/bar instead of smlnj/foo/bar. In
594 :     particular, when you fire up sml with a command-line argument, say,
595 :     e.g.:
596 :    
597 :     sml '$smlnj/cmb.cm'
598 :    
599 :     At the ML toplevel prompt:
600 :    
601 :     CM.autoload "$smlnj/cmb.cm";
602 :    
603 :     There is also a new controller in CM.Control that can be used to turn
604 :     off all remaining support for implicit anchors by saying:
605 :    
606 :     CM.autoload "$smlnj/
607 :     #set CM.Control.implicit_anchors false;
608 :    
609 :     This causes CM to reject implicitly anchored paths. This is (for the
610 :     time being) less permissive than the "final" version where there will
611 :     be no more such implicit anchors and relative paths will be just that:
612 :     relative.
613 :    
614 :     The next step (version after next version?) will be to make the
615 :     default for CM.Control.implicit_anchors false. After the dust has
616 :     settled, I can then produce the "final" version of this...
617 :    
618 :     Note: Since bootstrapping is a bit tricky, I provided new boot files.
619 :    
620 :     ----------------------------------------------------------------------
621 :     Name: Matthias Blume
622 : blume 642 Date: 2000/05/11 16:30:00 JST
623 :     Tag: blume-20000511-sources
624 :     Description:
625 :    
626 :     The main change is that I added function CM.sources as a generalized
627 :     version of the earlier CM.makedepend. This entails the following
628 :     additional changes:
629 :    
630 :     - CM.makedepend has been dropped.
631 :    
632 :     - CM manual has been updated.
633 :    
634 :     - TOOLS signature and API have been changed.
635 :    
636 :     ----------------------------------------------------------------------
637 : leunga 640 Name: Allen Leung
638 : leunga 641 Date: 2000/05/10 21:17 EDT
639 :     Tag: leunga-20000510-moby-c--ssa
640 :     Description:
641 :    
642 :     Various bug fixes and new features for C--, Moby and MLRISC optimizations.
643 :     None of these affect SML/NJ.
644 :    
645 :     1. Register Allocation
646 :    
647 :     a. A new ra spilling module (ra/ra-spill-with-renaming) is implemented.
648 :     This module tries to remove local (i.e. basic block level) redundancies
649 :     during spilling.
650 :    
651 :     b. A new framework for performing region based register allocation.
652 :     Not yet entirely functional.
653 :    
654 :     2. X86
655 :    
656 :     a. DefUse for POP was missing the stack pointer [found by Lal]
657 :     b. Reload for CALL was incorrect in X86Spill [found by John]
658 :     c. Various fixes in X86Spill so that it can be used correctly for
659 :     the new spilling module.
660 :    
661 :     3. SSA/IR
662 :    
663 :     a. New module ir/dj-dataflow.sml implements elimination based
664 :     data flow analysis.
665 :    
666 :     4. MLRiscGen
667 :    
668 :     a. Fix for gc type annotation
669 :    
670 :     5. MDGen
671 :    
672 :     Various fixes for machine description -> ml code translation. For ssa
673 :     only.
674 :    
675 :     ----------------------------------------------------------------------
676 :     Name: Allen Leung
677 : leunga 640 Date: 2000/05/08 22:17 EDT
678 :     Tag: leunga-20000508-labexp
679 :     Description:
680 :    
681 :     Fermin has found a few assembly problems with constant expressions
682 :     generated in LabelExp. Mostly, the problems involve extra parentheses,
683 :     which choke on dumb assemblers. This is his fix.
684 :    
685 :     ----------------------------------------------------------------------
686 : dbm 635 Name: Dave MacQueen
687 :     Date: 2000/04/09 14:00 EDT
688 :     Tag: dbm-20000502-Version_110_28
689 :     Description:
690 :    
691 :     1. Updated src/compiler/TopLevel/main/version.sml to version 110.28
692 :    
693 :     2. Updated config/version to 110.28
694 :    
695 :     3. Updated config/srcarchiveurl
696 :    
697 :     3. New boot files!
698 :     ftp://ftp.research.bell-labs.com/dist/smlnj/working/110.28/
699 :    
700 :     ----------------------------------------------------------------------
701 : blume 634 Name: Matthias Blume
702 :     Date: 2000/05/01 19:05:00 JST
703 :     Tag: blume-20000501-noweb
704 :     Description:
705 :    
706 :     A new noweb tool has been added. The existing system is entirely
707 :     unaffected by this, but some CM users have asked for renewed noweb
708 :     support. Everything is documented in the CM manual.
709 :    
710 :     New (plugin) libraries:
711 :    
712 :     noweb-tool.cm
713 :     nw-ext.cm
714 :    
715 :     ----------------------------------------------------------------------
716 : dbm 633 Name: Dave MacQueen
717 :     Date: 2000/04/30 12:40PM EDT
718 :     Tag: dbm-20000430-bug_fixes
719 :     Description:
720 :    
721 :     1. Fix for bug 1498
722 :     smlnj/src/system/Basis/Implementation/Unsafe/object.sig
723 :     smlnj/src/system/Basis/Implementation/Unsafe/object.sml
724 :     added toRealArray function
725 :     smlnj/src/compiler/MiscUtil/print/ppobj.sml
726 :     added check for tag Obj.RealArray to array printing case in ppObj
727 :    
728 :     2. Fix for bug 1510
729 :     smlnj/src/compiler/Semant/types/typesutil.sml
730 :     fixed definition of dummyargs (used by equalTycon) so that
731 :     dummy args are distinct types
732 :    
733 :     ----------------------------------------------------------------------
734 : blume 629 Name: Matthias Blume
735 : blume 632 Date: 2000/04/30 01:00:00 JST
736 :     Tag: blume-20000430-versions
737 :     Description:
738 :    
739 :     1. CM version numbering added. This is an implementation of Lal's
740 :     proposal for adding version numbers and version checking to .cm
741 :     files. Lal said that his proposal was just that -- a proposal.
742 :     For the time being I went ahead and implemented it so that people
743 :     can comment on it. Everything is completely backward-compatible
744 :     (except for the stable library format, i.e., new bootfiles!).
745 :    
746 :     As usual, see the CM manual for details.
747 :    
748 :     2. An alternative syntax for anchored paths has been implemented.
749 :     Dave has recently voiced the same concerns that I had when I did
750 :     this, so there should be some support. My take is that eventually
751 :     I will let support for the current syntax (where anchors are
752 :     "implicit") fade out in favor of the new, explicit syntax.
753 :     In order to be backward-compatible, both old and new syntax are
754 :     currently supported.
755 :    
756 :     Again, see the CM manual for details.
757 :    
758 :     3. Parallel make is trying to be slightly smarter: When the master
759 :     process finds a "bottleneck", i.e., when there is only one
760 :     compilation unit that can be compiled and everybody else is
761 :     waiting on it, then it will simply compile it directly instead
762 :     of clumsily telling one of the slaves to do it.
763 :    
764 :     4. Support for "unsharing" added. This is necessary in order to be
765 :     able to have two different versions of the same library running
766 :     at the same time (e.g., for trying out a new MLRISC while still
767 :     having the old MLRISC linked into the current compiler, etc.)
768 :     See the CM manual.
769 :    
770 :     5. Simple "makedepend" functionality added for generating Makefile
771 :     dependency information. (This is rather crude at the moment.
772 :     Expect some changes here in the future.)
773 :    
774 :     6. ".fun" added as a recognized suffix for ML files. Also documented
775 :     explicitly in the manual that the fallback behavior (unknown suffix
776 :     -> ML file) is not an official feature!
777 :    
778 :     7. Small changes to the pickler for stable libraries.
779 :    
780 :     8. Several internal changes to CM (for cleanup/improvement).
781 :    
782 :    
783 :     !!!! NEW BINFILES !!!!
784 :    
785 :     ----------------------------------------------------------------------
786 :     Name: Matthias Blume
787 : blume 631 Date: 2000/04/28 17:30:00 JST
788 :     Tag: blume-20000428-pathconfig
789 :     Description:
790 :    
791 :     1. I changed config/install.sh to remove duplicate entries from the
792 :     lib/pathconfig file at the end. Moreover, the final version of
793 :     lib/pathconfig is sorted alphabetically. The same (sorting) is done
794 :     in src/system/installml.
795 :    
796 :     2. The config/install.sh script now consistently uses relative
797 :     pathnames in lib/pathconfig whenever the anchor is in the lib
798 :     directory. (So far this was true for the libraries that come
799 :     pre-compiled and bundled as part of the bootfiles but not for
800 :     libraries that are compiled by the script itself.)
801 :    
802 :     ----------------------------------------------------------------------
803 :     Name: Matthias Blume
804 : blume 629 Date: 2000/04/26 13:10:00 JST
805 :     Tag: blume-20000426-fun_suffix
806 :     Description:
807 :    
808 :     Added ".fun" as a recognized file name suffix (for ML code).
809 :    
810 :     ----------------------------------------------------------------------
811 : leunga 628 Name: Allen Leung
812 :     Date: 2000/04/25 17:00:00 EST
813 :     Tag: leunga-20000425-alpha-ra
814 :     Description:
815 :    
816 :     1. Alpha
817 :    
818 :     PSEUDOARITH was missing in AlphaRewrite. This causes an endless loop
819 :     in C--.
820 :    
821 :     2. RA
822 :    
823 :     Added a flag "ra-dump-size" to print out the size of the flowgraph
824 :     and the interference graph.
825 :    
826 :     ----------------------------------------------------------------------
827 : dbm 627 Name: Dave MacQueen
828 :     Date: 2000/04/25/
829 :     Tag: dbm-20000425-mlyacc_doc_examples
830 :     Description:
831 :     Updated mlyacc.tex sections 5 and 7 for SML '97 and CM.
832 :     Updated all three examples in src/ml-yacc/examples to run
833 :     under 110.* using CM.make.
834 :    
835 :     ----------------------------------------------------------------------
836 : leunga 624 Name: Allen Leung
837 :     Date: 2000/04/20 23:04:00 EST
838 :     Tag: leunga-20000420-ssa-c---stuff
839 :     Description:
840 :    
841 :     This update synchronizes my repository with Yale's. Most of these
842 :     changes, however, do not affect SML/NJ at all (the RA is an exception).
843 :    
844 :     1. Register Allocator
845 :    
846 :     a. An improvement in the interference graph construction:
847 :     Given a copy
848 :    
849 :     s <- t
850 :    
851 : leunga 628 no interference edge between s and t is added for this definition of s.
852 : leunga 624
853 :     b. I've added two new spill heuristic modules that Fermin and I developed
854 :     (in the new library RA.cm). These are unused in SML/NJ but maybe
855 :     useful for others (Moby?)
856 :    
857 :     2. X86
858 :    
859 :     a. Various fixes in the backend provided by Fermin [C--] and Lal.
860 :    
861 :     3. Alpha
862 :    
863 :     a. Added the BSR instruction and code generation that goes with it [C--]
864 :     b. Other fixes too numerous to recount provided by Fermin [C--]
865 :    
866 :     4. Regmaps
867 :    
868 :     a. The regmaps are not initialized with the identity physical bindings
869 :     at creation time. This is unneeded.
870 :    
871 :     5. MLRISC Optimizations
872 :    
873 :     a. The DJ-Graph module can now compute the iterated dominance frontiers
874 :     intersects with liveness incrementally in linear time! Woohoo!
875 :     This is now used in my new SSA construction algorithm.
876 :    
877 :     b. THe branch reorganization module is now smarter about linear chains of
878 :     basic blocks.
879 :    
880 :    
881 :     ----------------------------------------------------------------------
882 : blume 615 Name: Matthias Blume
883 :     Date: 2000/04/12 13:52:00 JST
884 :     Tag: blume_main_v110p27_1
885 :     Description:
886 :    
887 :     Changed install.sh script to handle archive files without version number
888 :     and to use "boot.<arch>-<os>" instead of "sml.boot.<arch>-<os>" for the
889 :     name of the boot file archive.
890 :    
891 :     ----------------------------------------------------------------------
892 : dbm 607 Name: Dave MacQueen
893 :     Date: 2000/04/09 14:00 EDT
894 :     Tag: dbm-20000410-Version_110_27
895 :     Description:
896 :    
897 :     1. Updated src/compiler/TopLevel/main/version.sml to version 110.27
898 :    
899 :     2. Updated src/config/version to 110.27
900 :    
901 :     3. New boot files!
902 :    
903 :     ----------------------------------------------------------------------
904 : leunga 606 Name: Allen Leung
905 :     Date: 2000/04/09 19:09:00 EST
906 :     Tag: leunga-20000409-misc
907 :     Description:
908 :    
909 :     1. Yet another fix for x86 assembly for idivl, imull, mull and friends.
910 :    
911 :     2. Miscellaneous improvements to MLRISC (unused in sml/nj)
912 :    
913 :     ----------------------------------------------------------------------
914 : monnier 605 Name: Stefan
915 :     Date: 2000/04/07 10:00:00 EDT
916 :     Tag: monnier-20000406-branch-handling
917 :     Description:
918 :    
919 :     Improved handling of branches (mostly those generated from
920 :     polymorphic equality), removed switchoff and changed the
921 :     default optimization settings (more cpsopt and less flintopt).
922 :    
923 :     ----------------------------------------------------------------------
924 : leunga 601 Name: Allen Leung
925 : leunga 602 Date: 2000/04/06 01:30:00 EST
926 :     Tag: leunga-20000406-peephole-x86-SSA-2
927 :     Description:
928 :    
929 :     Forgot a few files.
930 :    
931 :     ----------------------------------------------------------------------
932 :     Name: Allen Leung
933 : leunga 601 Date: 2000/04/06 00:36:00 EST
934 :     Tag: leunga-20000406-peephole-x86-SSA
935 :     Description:
936 :    
937 :     1. New Peephole code
938 :    
939 :     2. Minor improvement to X86 instruction selection
940 :    
941 :     3. Various fixes to SSA and machine description -> code translator
942 :    
943 :     ----------------------------------------------------------------------
944 : blume 595 Name: Matthias Blume
945 :     Date: 2000/04/05 12:30:00 JST
946 :     Tag: blume_main_v110p26p2_3
947 :     Description:
948 :    
949 :     This update just merges three minor cosmetic updates to CM's sources
950 :     to get ready for the 110.27 code freeze on Friday. No functionality
951 :     has changed.
952 :    
953 :     ----------------------------------------------------------------------
954 : leunga 593 Name: Allen Leung
955 : leunga 594 Date: 2000/04/04 19:39:00 EST
956 :     Tag: leunga-20000404-x86-asm
957 :     Description:
958 :    
959 :     1. Fixed a problem in X86 assembly.
960 :    
961 :     Things like
962 :    
963 :     jmp %eax
964 :     jmp (%eax)
965 :    
966 :     should be output as
967 :    
968 :     jmp *%eax
969 :     jmp *(%eax)
970 :    
971 :     2. Assembly output
972 :    
973 :     Added a new flag
974 :    
975 :     "asm-indent-copies" (default to false)
976 :    
977 :     When this flag is on, parallel copies will be indented an extra level.
978 :    
979 :     ----------------------------------------------------------------------
980 :     Name: Allen Leung
981 : leunga 593 Date: 2000/04/04 03:18:00 EST
982 :     Tag: leunga-20000404-C--Moby
983 :     Description:
984 :    
985 :     All of these fixes are related to C--, Moby, and my own optimization
986 :     stuff; so they shouldn't affect SML/NJ.
987 :    
988 :     1. X86
989 :    
990 :     Various fixes related floating point, and extensions.
991 :    
992 :     2. Alpha
993 :    
994 :     Some extra patterns related to loads with signed/zero extension
995 :     provided by Fermin.
996 :    
997 :     3. Assembly
998 :    
999 : monnier 659 When generating assembly, resolve the value of client defined constants,
1000 : leunga 593 instead of generating symbolic values. This is controlled by the
1001 :     new flag "asm-resolve-constants", which is default to true.
1002 :    
1003 :     4. Machine Descriptions
1004 :    
1005 :     a. The precedence parser was slightly broken when parsing infixr symbols.
1006 :     b. The type generalizing code had the bound variables reversed, resulting
1007 :     in a problem during arity raising.
1008 :     c. Various fixes in machine descriptions.
1009 :    
1010 :     ----------------------------------------------------------------------
1011 : blume 592 Name: Matthias Blume
1012 :     Date: 2000/04/03 16:05:00 JST
1013 :     Tag: blume_main_v110p26p2_2
1014 :     Description:
1015 :    
1016 :     I eliminated coreEnv from compInfo. Access to the "Core" structure is
1017 :     now done via the ordinary static environment that is context to each
1018 :     compilation unit.
1019 :    
1020 :     To this end, I arranged that instead of "structure Core" as "structure
1021 :     _Core" is bound in the pervasive environment. Core access is done via
1022 : monnier 659 _Core (which can never be accidentally rebound because _Core is not a
1023 : blume 592 legal surface-syntax symbol).
1024 :    
1025 :     The current solution is much cleaner because the core environment is
1026 :     now simply part of the pervasive environment which is part of every
1027 :     compilation unit's context anyway. In particular, this eliminates all
1028 :     special-case handling that was necessary until now in order to deal
1029 :     with dynamic and symbolic parts of the core environment.
1030 :    
1031 :     Remaining hackery (to bind the "magic" symbol _Core) is localized in the
1032 : monnier 659 compilation manager's bootstrap compiler (actually: in the "init group"
1033 : blume 592 handling). See the comments in src/system/smlnj/init/init.cmi for
1034 :     more details.
1035 :    
1036 :     I also tried to track down all mentions of "Core" (as string argument
1037 :     to Symbol.strSymbol) in the compiler and replaced them with a
1038 :     reference to the new CoreSym.coreSym. Seems cleaner since the actual
1039 :     name appears in one place only.
1040 :    
1041 :     Binfile and bootfile format have not changed, but the switchover from
1042 :     the old "init.cmi" to the new one is a bit tricky, so I supplied new
1043 :     bootfiles anyway.
1044 :    
1045 :     ----------------------------------------------------------------------
1046 : leunga 591 Name: Allen Leung
1047 :     Date: 2000/04/02 21:17:00 EST
1048 :     Tag: leunga-20000402-mltree
1049 :     Description:
1050 : leunga 585
1051 : leunga 591 1. Renamed the constructor CALL in MLTREE by popular demand.
1052 :     2. Added a bunch of files from my repository. These are currently
1053 :     used by other non-SMLNJ backends.
1054 :    
1055 : leunga 576 ----------------------------------------------------------------------
1056 : leunga 590 Name: Allen Leung
1057 :     Date: 2000/03/31 21:15:00 EST
1058 :     Tag: leunga-20000331-aliasing
1059 :     Description:
1060 :    
1061 :     This update contains a rewritten (and hopefully more correct) module
1062 :     for extracting aliasing information from CPS.
1063 :    
1064 :     To turn on this feature:
1065 :    
1066 :     Compiler.Control.CG.memDisambiguate := true
1067 :    
1068 :     To pretty print the region information with assembly
1069 :    
1070 :     Compiler.Control.MLRISC.getFlag "asm-show-region" := true;
1071 :    
1072 :     To control how many levels of aliasing information are printed, use:
1073 :    
1074 :     Compiler.Control.MLRISC.getInt "points-to-show-level" := n
1075 :    
1076 :     The default of n is 3.
1077 :    
1078 :     ----------------------------------------------------------------------
1079 : dbm 589 Name: David MacQueen
1080 :     Date: 2000/03/31 11:15:00 EST
1081 :     Tag: dbm-20000331-runtime_fix
1082 :     Description:
1083 :    
1084 :     This update contains:
1085 :    
1086 :     1. runtime/c-lib/c-libraries.c
1087 :     includes added in revision 1.2 caused compilation errors on hppa-hpux
1088 :    
1089 :     2. fix for bug 1556
1090 :     system/Basis/Implementation/NJ/internal-signals.sml
1091 :    
1092 :     ----------------------------------------------------------------------
1093 : blume 587 Name: Matthias Blume
1094 : blume 588 Date: 2000/03/31 18:00:00 JST
1095 :     Tag: blume_main_v110p26p2_1
1096 :     Description:
1097 :    
1098 :     This update contains:
1099 :    
1100 :     1. A small change to CM's handling of stable libraries:
1101 :     CM now maintains one "global" modmap that is used for all stable
1102 :     libraries. The use of such a global modmap maximizes sharing and
1103 :     minimizes the need for re-traversing parts of environments during
1104 :     modmap construction. (However, this has minor impact since modmap
1105 :     construction seems to account for just one percent or less of total
1106 :     compile time.)
1107 :    
1108 :     2. I added a "genmap" phase to the statistics. This is where I got the
1109 :     "one percent" number (see above).
1110 :    
1111 :     3. CM's new tool parameter mechanism just became _even_ better. :)
1112 :     - The parser understands named parameters and recursive options.
1113 :     - The "make" and "shell" tools use these new features.
1114 :     (This makes it a lot easier to cascade these tools.)
1115 :     - There is a small syntax change: named parameters use a
1116 :    
1117 :     <name> : ( <option> ... ) or
1118 :     <name> : <string>
1119 :    
1120 :     syntax. Previously, named parameters were implemented in an
1121 :     ad-hoc fashion by each tool individually (by parsing strings)
1122 :     and had the form
1123 :    
1124 :     <name>=<string>
1125 :    
1126 :     See the CM manual for a full description of these issues.
1127 :    
1128 :     ----------------------------------------------------------------------
1129 :     Name: Matthias Blume
1130 : blume 587 Date: 2000/03/30 18:00:00 JST
1131 :     Tag: blume_main_v110p26p2_0
1132 :     Description:
1133 :    
1134 :     !!!!! WARNING !!!!!!
1135 :     !! New binfiles !!
1136 :     !!!!!!!!!!!!!!!!!!!!
1137 :    
1138 :     This update contains:
1139 :    
1140 :     1. Moderate changes to CM:
1141 :    
1142 :     - Changes to CM's tools mechanism. In particular, it is now possible
1143 :     to have tools that accept additional "command line" parameters
1144 :     (specified in the .cm file at each instance where the tool's class is
1145 :     used).
1146 :    
1147 : monnier 659 This was done to accommodate the new "make" and "shell" tools which
1148 :     facilitate fairly seamless hookup to portions of code managed using
1149 : blume 587 Makefiles or Shell scripts.
1150 :    
1151 :     There are no classes "shared" or "private" anymore. Instead, the
1152 :     sharing annotation is now a parameter to the "sml" class.
1153 :    
1154 :     There is a bit of generic machinery for implementing one's own
1155 :     tools that accept command-line parameters. However, I am not yet fully
1156 :     satisfied with that part, so expect changes here in the future.
1157 :    
1158 :     All existing tools are described in the CM manual.
1159 :    
1160 : monnier 659 - Slightly better error handling. (CM now suppresses many followup
1161 : blume 587 error messages that tended to be more annoying than helpful.)
1162 :    
1163 :     2. Major changes to the compiler's static environment data structures.
1164 :    
1165 :     - no CMStaticEnv anymore.
1166 :     - no CMEnv, no "BareEnvironment" (actually, _only_ BareEnvironment,
1167 :     but it is called Environment), no conversions between different
1168 :     kinds of static environments
1169 :    
1170 :     - There is still a notion of a "modmap", but such modmaps are generated
1171 :     on demand at the time when they are needed. This sounds slow, but I
1172 :     sped up the code that generates modmaps enough for this not to lead to
1173 :     a slowdown of the compiler (at least I didn't detect any).
1174 :    
1175 :     - To facilitate rapid modmap generation, static environments now
1176 :     contain an (optional) "modtree" structure. Modtree annotations are
1177 :     constructed by the unpickler during unpickling. (This means that
1178 :     the elaborator does not have to worry about modtrees at all.)
1179 :     Modtrees have the advantage that they are compositional in the same
1180 :     way as the environment data structure itself is compositional.
1181 :     As a result, modtrees never hang on to parts of an environment that
1182 :     has already been rendered "stale" by filtering or rebinding.
1183 :    
1184 :     - I went through many, many trials and errors before arriving at the
1185 :     current solution. (The initial idea of "linkpaths" did not work.)
1186 :     But the result of all this is that I have touched a lot of files that
1187 :     depend on the "modules" and "types" data structures (most of the
1188 :     elaborator). There were a lot of changes during my "linkpath" trials
1189 :     that could have been reverted to their original state but weren't.
1190 :     Please, don't be too harsh on me for messing with this code a bit more
1191 :     than what was strictly necessary... (I _did_ resist the tempation
1192 :     of doing any "global reformatting" to avoid an untimely death at
1193 :     Dave's hands. :)
1194 :    
1195 :     - One positive aspect of the previous point: At least I made sure that
1196 :     all files that I touched now compile without warnings (other than
1197 :     "polyEqual").
1198 :    
1199 :     - compiler now tends to run "leaner" (i.e., ties up less memory in
1200 :     redundant modmaps)
1201 :    
1202 :     ----------------------------------------------------------------------
1203 : leunga 580 Name: Allen Leung
1204 : leunga 585 Date: 2000/03/29 18:00:00
1205 :     Tag: leunga-20000327-mlriscGen_hppa_alpha_x86
1206 : leunga 586 Boot files (optional): ftp://react-ilp.cs.nyu.edu/leunga/110.26.1-sml.boot.x86-unix-20000330.tar.gz
1207 : leunga 585 Description:
1208 :    
1209 :     This update contains *MAJOR* changes to the way code is generated from CPS
1210 :     in the module mlriscGen, and in various backend modules.
1211 :    
1212 :     CHANGES
1213 :     =======
1214 :    
1215 :     1. MLRiscGen: forward propagation fix.
1216 :    
1217 :     There was a bug in forward propagation introduced at about the same time
1218 :     as the MLRISC x86 backend, which prohibits coalescing to be
1219 :     performed effectively in loops.
1220 :    
1221 :     Effect: speed up of loops in RISC architectures.
1222 :     By itself, this actually slowed down certain benchmarks on the x86.
1223 :    
1224 :     2. MLRiscGen: forward propagating addresses from consing.
1225 :    
1226 :     I've changed the way consing code is generated. Basically I separated
1227 :     out the initialization part:
1228 :    
1229 :     store tag, offset(allocptr)
1230 :     store elem1, offset+4(allocptr)
1231 :     store elem2, offset+8(allocptr)
1232 :     ...
1233 :     store elemn, offset+4n(allocptr)
1234 :    
1235 :     and the address computation part:
1236 :    
1237 :     celladdr <- offset+4+alloctpr
1238 :    
1239 :     and move the address computation part
1240 :    
1241 :     Effect: register pressure is generally lower as a result. This
1242 :     makes compilation of certain expressions much faster, such as
1243 :     long lists with non-trivial elements.
1244 :    
1245 :     [(0,0), (0,0), .... (0,0)]
1246 :    
1247 :     3. MLRiscGen: base pointer elimination.
1248 :    
1249 :     As part of the linkage mechanism, we generate the sequence:
1250 :    
1251 :     L: ... <- start of the code fragment
1252 :    
1253 :     L1:
1254 :     base pointer <- linkreg - L1 + L
1255 :    
1256 :     The base pointer was then used for computing relocatable addresses
1257 :     in the code fragment. Frequently (such as in lots of continuations)
1258 :     this is not needed. We now eliminate this sequence whenever possible.
1259 :    
1260 :     For compile time efficiency, I'm using a very stupid local heuristic.
1261 :     But in general, this should be done as a control flow analysis.
1262 :    
1263 :     Effect: Smaller code size. Speed up of most programs.
1264 :    
1265 :     4. Hppa back end
1266 :    
1267 :     Long jumps in span dependence resolution used to depend on the existence
1268 :     of the base pointer.
1269 :    
1270 :     A jump to a long label L was expanded into the following sequence:
1271 :    
1272 :     LDIL %hi(L-8192), %r29
1273 :     LDO %lo(L-8192)(%r29), %r29
1274 :     ADD %r29, baseptr, %r29
1275 :     BV,n %r0(%r29)
1276 :    
1277 :     In the presence of change (3) above, this will not work. I've changed
1278 :     it so that the following sequence of instructions are generated, which
1279 :     doesn't mention the base pointer at all:
1280 :    
1281 :     BL,n L', %r29 /* branch and link, L' + 4 -> %r29 */
1282 :     L': ADDIL L-(L'+4), %r29 /* Compute address of L */
1283 :     BV,n %r0(%r29) /* Jump */
1284 :    
1285 :     5. Alpha back end
1286 :    
1287 :     New alpha instructions LDB/LDW have been added, as per Fermin's
1288 :     suggestions. This is unrelated to all other changes.
1289 :    
1290 :     6. X86 back end
1291 :    
1292 :     I've changed andl to testl in the floating point test sequence
1293 :     whenever appropriate. The Intel optimization guide states that
1294 : monnier 659 testl is preferable to andl.
1295 : leunga 585
1296 :     7. RA (x86 only)
1297 :    
1298 :     I've improved the spill propagation algorithm, using an approximation
1299 :     of maximal weighted independent sets. This seems to be necessary to
1300 :     alleviate the negative effect in light of the slow down in (1).
1301 :    
1302 :     I'll write down the algorithm one of these days.
1303 :    
1304 :     8. MLRiscGen: frequencies
1305 :    
1306 :     I've added an annotation that states that all call gc blocks have zero
1307 :     execution frequencies. This improves register allocation on the x86.
1308 :    
1309 :     BENCHMARKS
1310 :     ==========
1311 :    
1312 :     I've only perform the comparison on 110.25.
1313 :    
1314 :     The platforms are:
1315 :    
1316 :     HPPA A four processor HP machine (E9000) with 5G of memory.
1317 :     X86 A 300Hhz Pentium II with 128M of memory, and
1318 :     SPARC An Ultra sparc 2 with 512M of memory.
1319 :    
1320 :     I used the following parameters for the SML benchmarks:
1321 :    
1322 :     @SMLalloc
1323 :     HPPA 256k
1324 :     SPARC 512k
1325 :     X86 256k
1326 :    
1327 :     COMPILATION TIME
1328 :     ----------------
1329 :     Here are the numbers comparing the compilation times of the compilers.
1330 :     I've only compared 110.25 compiling the new sources versus
1331 :     a fixpoint version of the new compiler compiling the same.
1332 :    
1333 :     110.25 New
1334 :     Total Time in RA Spill+Reload Total Time In RA Spill+Reload
1335 :     HPPA 627s 116s 2684+3584 599s 95s 1003+1879
1336 :     SPARC 892s 173s 2891+3870 708s 116s 1004+1880
1337 :     X86 999s 315s 94006+130691 987s 296s 108877+141957
1338 :    
1339 :     110.25 New
1340 :     Code Size Code Size
1341 :     HPPA 8596736 8561421
1342 :     SPARC 8974299 8785143
1343 :     X86 9029180 8716783
1344 :    
1345 :     So in summary, things are at least as good as before. Dramatic
1346 :     reduction in compilation is obtained on the Sparc; I can't explain it,
1347 :     but it is reproducible. Perhaps someone should try to reproduce this
1348 :     on their own machines.
1349 :    
1350 :     SML BENCHMARKS
1351 :     --------------
1352 :    
1353 :     On the average, all benchmarks perform at least as well as before.
1354 :    
1355 :     HPPA Compilation Time Spill+Reload Run Time
1356 :     110.25 New 110.25 New 110.25 New
1357 :    
1358 :     barnesHut 3.158 3.015 4.75% 1+1 0+0 2.980 2.922 2.00%
1359 :     boyer 6.152 5.708 7.77% 0+0 0+0 0.218 0.213 2.34%
1360 :     count-graphs 1.168 1.120 4.32% 0+0 0+0 22.705 23.073 -1.60%
1361 :     fft 0.877 0.792 10.74% 1+3 1+3 0.602 0.587 2.56%
1362 :     knuthBendix 3.180 2.857 11.32% 0+0 0+0 0.675 0.662 2.02%
1363 :     lexgen 6.190 5.290 17.01% 0+0 0+0 0.913 0.788 15.86%
1364 :     life 0.803 0.703 14.22% 25+25 0+0 0.153 0.140 9.52%
1365 :     logic 2.048 2.007 2.08% 6+6 1+1 4.133 4.008 3.12%
1366 :     mandelbrot 0.077 0.080 -4.17% 0+0 0+0 0.765 0.712 7.49%
1367 :     mlyacc 22.932 20.937 9.53% 154+181 32+57 0.468 0.430 8.91%
1368 :     nucleic 5.183 5.060 2.44% 2+2 0+0 0.125 0.120 4.17%
1369 :     ratio-regions 3.357 3.142 6.84% 0+0 0+0 116.225 113.173 2.70%
1370 :     ray 1.283 1.290 -0.52% 0+0 0+0 2.887 2.855 1.11%
1371 :     simple 6.307 6.032 4.56% 28+30 5+7 3.705 3.658 1.28%
1372 :     tsp 0.888 0.862 3.09% 0+0 0+0 7.040 6.893 2.13%
1373 :     vliw 24.378 23.455 3.94% 106+127 25+45 2.758 2.707 1.91%
1374 :     --------------------------------------------------------------------------
1375 :     Average 6.12% 4.09%
1376 :    
1377 :     SPARC Compilation Time Spill+Reload Run Time
1378 :     110.25 New 110.25 New 110.25 New
1379 :    
1380 :     barnesHut 3.778 3.592 5.20% 2+2 0+0 3.648 3.453 5.65%
1381 :     boyer 6.632 6.110 8.54% 0+0 0+0 0.258 0.242 6.90%
1382 :     count-graphs 1.435 1.325 8.30% 0+0 0+0 33.672 34.737 -3.07%
1383 :     fft 0.980 0.940 4.26% 3+9 2+6 0.838 0.827 1.41%
1384 :     knuthBendix 3.590 3.138 14.39% 0+0 0+0 0.962 0.967 -0.52%
1385 :     lexgen 6.593 6.072 8.59% 1+1 0+0 1.077 1.078 -0.15%
1386 :     life 0.972 0.868 11.90% 26+26 0+0 0.143 0.140 2.38%
1387 :     logic 2.525 2.387 5.80% 7+7 1+1 5.625 5.158 9.05%
1388 :     mandelbrot 0.090 0.093 -3.57% 0+0 0+0 0.855 0.728 17.39%
1389 :     mlyacc 26.732 23.827 12.19% 162+189 32+57 0.550 0.560 -1.79%
1390 :     nucleic 6.233 6.197 0.59% 3+3 0+0 0.163 0.173 -5.77%
1391 :     ratio-regions 3.780 3.507 7.79% 0+0 0+0 133.993 131.035 2.26%
1392 :     ray 1.595 1.550 2.90% 1+1 0+0 3.440 3.418 0.63%
1393 :     simple 6.972 6.487 7.48% 29+32 5+7 3.523 3.525 -0.05%
1394 :     tsp 1.115 1.063 4.86% 0+0 0+0 7.393 7.265 1.77%
1395 :     vliw 27.765 24.818 11.87% 110+135 25+45 2.265 2.135 6.09%
1396 :     ----------------------------------------------------------------------------
1397 :     Average 6.94% 2.64%
1398 :    
1399 :     X86 Compilation Time Spill+Reload Run Time
1400 :     110.25 New 110.25 New 110.25 New
1401 :    
1402 :     barnesHut 5.530 5.420 2.03% 593+893 597+915 3.532 3.440 2.66%
1403 :     boyer 8.768 7.747 13.19% 493+199 301+289 0.327 0.297 10.11%
1404 :     count-graphs 2.040 2.010 1.49% 298+394 315+457 26.578 28.660 -7.26%
1405 :     fft 1.327 1.302 1.92% 112+209 115+210 1.055 0.962 9.71%
1406 :     knuthBendix 5.218 5.475 -4.69% 451+598 510+650 0.928 0.932 -0.36%
1407 :     lexgen 9.970 9.623 3.60% 1014+841 1157+885 0.947 0.928 1.97%
1408 :     life 1.183 1.183 0.00% 162+182 145+148 0.127 0.103 22.58%
1409 :     logic 3.285 3.512 -6.45% 514+684 591+836 5.682 5.577 1.88%
1410 :     mandelbrot 0.147 0.143 2.33% 38+41 33+54 0.703 0.690 1.93%
1411 :     mlyacc 35.457 32.763 8.22% 3496+4564 3611+4860 0.552 0.550 0.30%
1412 :     nucleic 7.100 6.888 3.07% 239+168 201+158 0.175 0.173 0.96%
1413 :     ratio-regions 6.388 6.843 -6.65% 1182+257 981+300 120.142 120.345 -0.17%
1414 :     ray 2.332 2.338 -0.29% 346+398 402+494 3.593 3.540 1.51%
1415 :     simple 9.912 9.903 0.08% 1475+941 1579+1168 3.057 3.178 -3.83%
1416 :     tsp 1.623 1.532 5.98% 266+200 250+211 8.045 7.878 2.12%
1417 :     vliw 33.947 35.470 -4.29% 2629+2774 2877+3171 2.072 1.890 9.61%
1418 :     ----------------------------------------------------------------------------
1419 :     Average 1.22% 3.36%
1420 :    
1421 :     ----------------------------------------------------------------------
1422 :     Name: Allen Leung
1423 : leunga 583 Date: 2000/03/23 16:25:00
1424 :     Tag: leunga-20000323-fix_x86_alpha
1425 :     Description:
1426 :    
1427 :     1. X86 fixes/changes
1428 :    
1429 :     a. The old code generated for SETcc was completely wrong.
1430 :     The Intel optimization guide is VERY misleading.
1431 :    
1432 :     2. ALPHA fixes/changes
1433 :    
1434 :     a. Added the instructions LDBU, LDWU, STB, STW as per Fermin's suggestion.
1435 :     b. Added a new mode byteWordLoadStores to the functor parameter to Alpha()
1436 :     c. Added reassociation code for address computation.
1437 :    
1438 :     ----------------------------------------------------------------------
1439 :     Name: Allen Leung
1440 : leunga 580 Date: 2000/03/22 01:23:00
1441 :     Tag: leunga-20000322-fix_x86_hppa_ra
1442 :     Description:
1443 :    
1444 :     1. X86 fixes/changes
1445 :    
1446 :     a. x86Rewrite bug with MUL3 (found by Lal)
1447 :     b. Added the instructions FSTS, FSTL
1448 :    
1449 :     2. PA-RISC fixes/changes
1450 :    
1451 :     a. B label should not be a delay slot candidate! Why did this work?
1452 :     b. ADDT(32, REG(32, r), LI n) now generates one instruction instead of two,
1453 :     as it should be.
1454 :     c. The assembly syntax for fstds and fstdd was wrong.
1455 :     d. Added the composite instruction COMICLR/LDO, which is the immediate
1456 :     operand variant of COMCLR/LDO.
1457 :    
1458 :     3. Generic MLRISC
1459 :    
1460 :     a. shuffle.sml rewritten to be slightly more efficient
1461 :     b. DIV bug in mltree-simplify fixed (found by Fermin)
1462 :    
1463 :     4. Register Allocator
1464 :    
1465 :     a. I now release the interference graph earlier during spilling.
1466 :     May improve memory usage.
1467 :    
1468 :     ----------------------------------------------------------------------
1469 : blume 577 Name: Matthias Blume
1470 : blume 578 Date: 2000/03/14 14:15:32
1471 :     Tag: blume_main_v110p26p1_2
1472 :     Description:
1473 :    
1474 :     1. Tools.registerStdShellCmdTool (from smlnj/cm/tool.cm) takes an
1475 :     additional argument called "template" which is an optional string that
1476 : monnier 659 specifies the layout of the tool command line. See the CM manual for
1477 : blume 578 explanation.
1478 :    
1479 : monnier 659 2. A special-purpose tool can be "registered" by simply dropping the
1480 : blume 578 corresponding <...>-tool.cm (and/or <...>-ext.cm) into the same
1481 :     directory where the .cm file lives that uses this tool. (The
1482 :     behavior/misfeature until now was to look for the tool description
1483 :     files in the current working directory.) As before, tool description
1484 :     files could also be anchored -- in which case they can live anywhere
1485 :     they like. Following the recent e-mail discussion, this change should
1486 :     make it easier to have special-purpose tools that are shipped together
1487 :     with the sources of the program that uses them.
1488 :    
1489 :     ----------------------------------------------------------------------
1490 :     Name: Matthias Blume
1491 : blume 577 Date: 2000/03/10 07:48:34
1492 :     Tag: blume_main_v110p26p1_1
1493 :     Description:
1494 :    
1495 :     I added a re-written version of Dave's fixpt script to src/system.
1496 :     Changes relative to the original version:
1497 :     - sh-ified (not everybody has ksh)
1498 :     - automatically figures out which architecture it runs on
1499 :     - uses ./makeml a bit more cleverly
1500 :     - never invokes ./installml (and, thus, does not clobber your
1501 :     good and working installation of sml in case something goes wrong)
1502 :     - accepts max iteration count using option "-iter <n>"
1503 :     - accepts a "base" name using option "-base <base>"
1504 :    
1505 :     It does not build any extraneous heap images but directly rebuilds
1506 :     bin- and boot-hierarchies using makeml's "-rebuild" switch. Finally,
1507 :     it can incorporate existing bin- and boot- hierarchies. For example,
1508 :     suppose the base is set to "sml" (which is the default). Then it
1509 :     successively builds
1510 :    
1511 :     sml.bin.<arch>-unix and sml.boot.<arch>-unix
1512 :     then sml1.bin.<arch>-unix and sml1.boot.<arch>-unix
1513 :     then sml2.bin.<arch>-unix and sml2.boot.<arch>-unix
1514 :     ...
1515 :     then sml<n>.bin.<arch>-unix and sml<n>.boot.<arch>-unix
1516 :    
1517 :     and so on. If any of these already exist, it will just use what's
1518 :     there. In particular, many people will have the initial set of bin
1519 :     and boot files around, so this saves time for at least one full
1520 :     rebuild. Having sets of the form <base><k>.{bin,boot}.<arch>-unix for
1521 :     <k>=1,2,... is normally not a good idea when invoking fixpt. However,
1522 :     they might be the result of an earlier partial run of fixpt (which
1523 : monnier 659 perhaps got accidentally killed). In this case, fixpt will quickly
1524 : blume 577 move through what exists before continuing where it left off earlier,
1525 :     and, thus, saves a lot of time.
1526 :    
1527 :     ----------------------------------------------------------------------
1528 : leunga 576 Name: Allen Leung
1529 :     Date: 00/03/10 02:20:00
1530 :     Tag: leunga-20000310-fix_x86_asm_ra
1531 :     Description:
1532 : dbm 570
1533 : leunga 576 More assembly output problems involving the indexed addressing mode
1534 :     on the x86 have been found and corrected. Thanks to Fermin Reig for the
1535 :     fix.
1536 :    
1537 :     The interface and implementation of the register allocator have been changed
1538 :     slightly to accommodate the possibility to skip the register allocation
1539 :     phases completely and go directly to memory allocation. This is needed
1540 :     for C-- use.
1541 :    
1542 : dbm 570 ----------------------------------------------------------------------
1543 : blume 572 Name: Matthias Blume
1544 : blume 575 Date: 00/03/09 10:23:53
1545 :     Tag: blume_main_v110p26p1_0
1546 :     Description:
1547 :    
1548 :     * Complete re-organization of library names. Many libraries have been
1549 :     consolidated so that they share the same path anchor. For example,
1550 :     all MLRISC-related libraries are anchored at MLRISC, most libraries that
1551 :     are SML/NJ-specific are under "smlnj". Notice that names like
1552 :     host-cmb.cm or host-compiler.cm no longer exist. See system/README
1553 :     for a complete description of the new naming scheme. Quick reference:
1554 :    
1555 :     host-cmb.cm -> smlnj/cmb.cm
1556 :     host-compiler.cm -> smlnj/compiler.cm
1557 :     full-cm.cm -> smlnj/cm.cm
1558 :     <arch>-<os>.cm -> smlnj/cmb/<arch>-<os>.cm
1559 :     <arch>-compiler.cm -> smlnj/compiler/<arch>.cm
1560 :    
1561 :     * Bug fixes in CM.
1562 :     - exceptions in user code are being passed through (i.e., reach top level)
1563 :     - more bugs in paranoia mode fixed
1564 :     - bug related to checking group owners fixed
1565 :    
1566 :     * New install.sh script that automagically fetches archive files:
1567 :     The new file config/srcarchiveurl must contain the URL of the
1568 :     (remote) directory that contains bin files (or other source archives).
1569 :     If install.sh does not find the archive locally, it tries to get
1570 :     it from that remote directory.
1571 :     This should simplify installation further: For machines that have
1572 :     access to the internet, just fetch <version>-config.tgz, unpack it,
1573 : monnier 659 edit config/targets, and go (run config/install.sh). The script will
1574 : blume 575 fetch everything else that it might need all by itself.
1575 :    
1576 :     For CVS users, this mechanism is not relevant for source archives, but
1577 :     it is convenient for getting new sets of binfiles.
1578 :    
1579 :     Archives should be tar files compressed with either gzip, compress, or
1580 :     bzip2. The script recognizes .tgz, .tar, tar.gz, tz, .tar.Z, and .tar.bz2.
1581 :    
1582 :     ----------------------------------------------------------------------
1583 :     Name: Matthias Blume
1584 : blume 572 Date: 2000/03/07 04:01:04
1585 :     Tag: blume_main_v110_26_2
1586 : dbm 570 Description:
1587 : blume 572 - size info in BOOTLIST
1588 :     * no fixed upper limits for number of bootfiles or length of
1589 :     bootfile names in runtime
1590 :     * falling back to old behavior if no BOOTLIST size info found
1591 :     - allocation size heuristics in .run-sml
1592 :     * tries to read cache size from /proc/cpuinfo (this is important for
1593 :     small-cache Celeron systems!)
1594 :     - install.sh robustified
1595 :     - CM manual updates
1596 :     - paranoid mode
1597 :     * no more CMB.deliver() (i.e., all done by CMB.make())
1598 :     * can re-use existing sml.boot.* files
1599 :     * init.cmi now treated as library
1600 :     * library stamps for consistency checks
1601 :     - sml.boot.<arch>-<os>/PIDMAP file
1602 :     * This file is read by the CM startup code. This is used to minimize
1603 :     the amount of dynamic state that needs to be stowed away for the
1604 :     purpose of sharing between interactive system and user code.
1605 :     - CM.Anchor.anchor instead of CM.Anchor.{set,cancel}
1606 :     * Upon request by Elsa. Anchors now controlled by get-set-pair
1607 :     like most other CM state variables.
1608 :     - Compiler.CMSA eliminated
1609 :     * No longer supported by CM anyway.
1610 :     - fixed bugs in pickler that kept biting Stefan
1611 :     * past refs to past refs (was caused by the possibility that
1612 :     ad-hoc sharing is more discriminating than hash-cons sharing)
1613 :     * integer overflow on LargeInt.minInt
1614 :     - ml-{lex,yacc} build scripts now use new mechanism
1615 :     for building standalone programs
1616 :     - fixed several gcc -Wall warnings that were caused by missing header
1617 :     files, missing initializations, etc., in runtime (not all warnings
1618 :     eliminated, though)

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