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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 680 Name: Matthias Blume
16 : blume 682 Date: 2000/07/04 15:26:00
17 :     Tag: blume-20000704-trigger
18 :     Description:
19 :    
20 :     1. Improvements to CM manual.
21 :     2. SMLofNJ.Internals.BTrace.trigger reinstated as an alternative way
22 :     of getting a back-trace. The function, when called, raises an
23 :     internal exception which explicitly carries the full back-trace history,
24 :     so it is unaffected by any intervening handle-raise pairs ("trivial"
25 :     or not). The interactive loop will print that history once it arrives
26 :     at top level.
27 :     Short of having all exceptions implicitly carry the full history, the
28 :     recommended way of using this facility is:
29 :     - compile your program with instrumentation "on"
30 :     - run it, when it raises an exception, look at the history
31 :     - if the history is "cut off" because of some handler, go and modify
32 :     your program so that it explicitly calls BTrace.trigger
33 :     - recompile (still instrumented), and rerun; look at the full history
34 :    
35 :     ----------------------------------------------------------------------
36 :     Name: Matthias Blume
37 :     Date: 2000/07/03 15:36:00 JST
38 : blume 680 Tag: blume-20000702-manual
39 :     Description:
40 :    
41 :     Small corrections and updates to CM manual.
42 :    
43 :     ----------------------------------------------------------------------
44 : blume 682 Name: Matthias Blume
45 : blume 679 Date: 2000/06/29 16:04:00 JST
46 :     Tag: blume-20000629-yacctool
47 :     Description:
48 :    
49 :     Changes:
50 :    
51 :     1. Class "mlyacc" now takes separate arguments to pass options to
52 :     generated .sml- and .sig-files independently.
53 :     2. Corresponding CM manual updates.
54 :     3. BTrace module now also reports call sites. (However, for loop clusters
55 :     it only shows from where the cluster was entered.) There are associated
56 :     modifications to core.sml, internals.{sig,sml}, btrace.sml, and btimp.sml.
57 :    
58 :     ----------------------------------------------------------------------
59 : blume 675 Name: Matthias Blume
60 : blume 678 Date: 2000/06/27 16:51:00 JST
61 :     Tag: blume-20000627-noweb
62 :     Description:
63 :    
64 :     Changes:
65 :    
66 :     1. Implemented "subdir" and "witness" options for noweb tool.
67 :     This caused some slight internal changes in CM's tool implementation.
68 :     2. Fixed bug in "tool plugin" mechanism. This is essentially cleaning
69 :     some remaining issues from earlier path anchor changes.
70 :     3. Updated CM manual accordingly.
71 :    
72 :     4. Changed implementation of back-tracing so that I now consider it
73 :     ready for prime-time.
74 :    
75 :     In particular, you don't have to explicitly trigger the back-trace
76 :     anymore. Instead, if you are running BTrace-instrumented code and
77 :     there is an uncaught exception (regardless of whether or not it was
78 :     raised in instrumented code), the top-level evalloop will print
79 :     the back-trace.
80 :    
81 :     Features:
82 :    
83 :     - Instrumented and uninstrumented code work together seemlessly.
84 :     (Of course, uninstrumented code is never mentioned in actual
85 :     back-traces.)
86 :    
87 :     - Asymptotic time- and space-complexity of instrumented code is
88 :     equal to that of uninstrumented code. (This means that
89 :     tail-recursion is preserved by the instrumentation phase.)
90 :    
91 :     - Modules whose code has been instrumented in different sessions
92 :     work together without problem.
93 :    
94 :     - There is no penalty whatsoever on uninstrumented code.
95 :    
96 :     - There is no penalty on "raise" expressions, even in
97 :     instrumented code.
98 :    
99 :     A potential bug (or perhaps it is a feature, too):
100 :    
101 :     A back-trace reaches no further than the outermost instrumented
102 :     non-trivial "raise". Here, a "trivial" raise is one that is the
103 :     sole RHS of a "handle" rule. Thus, back-traces reach trough
104 :    
105 :     <exp> handle e => raise e
106 :    
107 :     and even
108 :    
109 :     <exp> handle Foo => raise Bar
110 :    
111 :     and, of course, through
112 :    
113 :     <exp> handle Foo => ...
114 :    
115 :     if the exception was not Foo.
116 :    
117 :     Back-traces always reach right through any un-instrumented code
118 :     including any of its "handle" expressions, trivial or not.
119 :    
120 :     To try this out, do the following:
121 :    
122 :     - Erase all existing binfiles for your program.
123 :     (You may keep binfiles for those modules where you think you
124 :     definitely don't need back-tracing.)
125 :     - Turn on back-trace instrumentation:
126 :     SMLofNJ.Internals.BTrace.mode (SOME true);
127 :     - Recompile your program. (I.e., run "CM.make" or "use".)
128 :     - You may now turn instrumentation off again (if you want):
129 :     SMLofNJ.Internals.BTrace.mode (SOME false);
130 :     - Run your program as usual. If it raises an exception that
131 :     reaches the interactive toplevel, then a back-trace will
132 :     automatically be printed. After that, the toplevel loop
133 :     will print the exception history as usual.
134 :    
135 :     ----------------------------------------------------------------------
136 :     Name: Matthias Blume
137 : blume 677 Date: 2000/06/26 09:56:46 JST
138 :     Tag: blume-20000626-setup
139 :     Description:
140 :    
141 :     CM: - setup-parameter to "sml" added; this can be used to run arbitrary
142 :     ML code before and after compiling a file (e.g., to set compiler
143 :     flags)
144 :    
145 :     Compiler: - improved btrace API (in core.sml, internals.{sig,sml})
146 :     - associated changes to btrace.sml (BTrace instrumentation pass)
147 :     - cleaner implementation of btimp.sml (BTrace tracing and report
148 :     module)
149 :    
150 :     CM manual: * new path encoding documented
151 :     * description of setup-parameter to "sml" added
152 :    
153 :     The biggest user-visible change to back-tracing is that it is no
154 :     longer necessary to compile all traced modules within the same
155 :     session. (This was a real limitation.)
156 :    
157 :     ----------------------------------------------------------------------
158 :     Name: Matthias Blume
159 : blume 676 Date: 2000/06/24 12:40:00 JST
160 :     Tag: blume-20000624-startup
161 :     Description:
162 :    
163 :     Fixes startup slowdown problem. (I was calling SrcPath.sync a _tad_
164 :     bit too often -- to put it mildly. :)
165 :    
166 :     ----------------------------------------------------------------------
167 :     Name: Matthias Blume
168 : blume 675 Date: 2000/06/23 18:20:00 JST
169 :     Tag: blume-20000623-btrace
170 :     Description:
171 :    
172 :     This updates adds a backtrace facility to aid programmers in debugging
173 :     their programs. This involves the following changes:
174 :    
175 :     1. Module system/smlnj/init/core.sml (structure _Core) now has hooks for
176 :     keeping track of the current call stack. When programs are compiled
177 :     in a special mode, the compiler will insert calls to these hooks
178 :     into the user program.
179 :     "Hook" means that it is possible for different implementations of
180 :     back-tracing to register themselves (at different times).
181 :    
182 :     2. compiler/MiscUtil/profile/btrace.sml implements the annotation phase
183 :     as an Absyn.dec->Absyn.dec rewrite. Normally this phase is turned off.
184 :     It can be turned on using this call:
185 :     SMLofNJ.Internals.BTrace.mode (SOME true);
186 :     Turning it off again:
187 :     SMLofNJ.Internals.BTrace.mode (SOME false);
188 :     Querying the current status:
189 :     SMLofNJ.Internals.BTrace.mode NONE;
190 :     Annotated programs are about twice as big as normal ones, and they
191 :     run a factor of 2 to 4 slower with a dummy back-trace plugin (one
192 :     where all hooks do nothing). The slowdown with a plugin that is
193 :     actually useful (such as the one supplied by default) is even greater,
194 :     but in the case of the default plugin it is still only an constant
195 :     factor (amortized).
196 :    
197 :     3. system/Basis/Implementation/NJ/internals.{sig,sml} have been augmented
198 :     with a sub-structure BTrace for controlling back-tracing. In particular,
199 :     the above-mentioned function "mode" controls whether the annotation
200 :     phase is invoked by the compiler. Another important function is
201 :     "trigger": when called it aborts the current execution and causes
202 :     the top-level loop to print a full back-trace.
203 :    
204 :     4. compiler/MiscUtil/profile/btimp.sml is the current default plugin
205 :     for back-tracing. It keeps track of the dynamic call stack and in
206 :     addition to that it keeps a partial history at each "level" of that
207 :     stack. For example, if a tail-calls b, b tail-calls c, and c tail-calls
208 :     d and b (at separate times, dynamically), then the report will show:
209 :    
210 :     GOTO d
211 :     /c
212 :     GOTO \b
213 :     CALL a
214 :    
215 :     This shows that there was an initial non-tail call of a, then a
216 :     tail-call to b or c, looping behavior in a cluster of functions that
217 :     consist of b and c, and then a goto from that cluster (i.e., either from
218 :     b or from c) to d.
219 :    
220 :     Note that (depending on the user program) the amount of information
221 :     that the back-trace module has to keep track of at each level is bounded
222 :     by a constant. Thus, the whole implementation has the same asymptotical
223 :     complexity as the original program (both in space and in time).
224 :    
225 :     5. compiler/TopLevel/interact/evalloop.sml has been modified to
226 :     handle the special exception SMLofNJ.Internals.BTrace.BTrace
227 :     which is raised by the "trigger" function mentioned above.
228 :    
229 :     Notes on usage:
230 :    
231 :     - Annotated code works well together with unannotated code:
232 :     Unannotated calls simply do not show up at all in the backtrace.
233 :    
234 :     - It is not a good idea to let modules that were annotated during
235 :     different sessions run at the same time. This is because the compiler
236 :     chooses small integers to identify individual functions, and there
237 :     will be clashes if different modules were compiled in separate sessions.
238 :     (Nothing will crash, and you will even be told about the clashes, but
239 :     back-trace information will in general not be useful.)
240 :    
241 :     - Back-tracing can be confused by callcc and capture.
242 :    
243 :     - The only way of getting a back-trace right now is to explicitly
244 :     invoke the "trigger" function from your user program. Eventually, we
245 :     should make every exception carry back-trace information (if
246 :     available). But since this creates more overhead at "raise"-time
247 :     (similar to the current exnHistory overhead), I have not yet
248 :     implemented this. (The implementation will be rather easy.) With
249 :     exceptions carrying back-trace information, this facility will be even
250 :     more useful because users don't need to modify their programs...
251 :    
252 :     - While it is possible to compile the compiler with back-trace
253 :     annotations turned on (I did it to get some confidence in
254 :     correctness), you must make absolutely sure that core.sml and
255 :     btimp.sml are compiled WITHOUT annotation! (core.sml cannot actually
256 :     be compiled with annotation because there is no core access yet, but
257 :     if you compile btimp.sml with annotation, then the system will go into
258 :     an infinite recursion and crash.)
259 :     Since CM currently does not know about BTrace, the only way to turn
260 :     annotations on and off for different modules of the compiler is to
261 :     interrupt CMB.make, change the settings, and re-invoke it. Of course,
262 :     this is awkward and clumsy.
263 :    
264 :     Sample sessions:
265 :    
266 :     Standard ML of New Jersey v110.28.1 [FLINT v1.5], June 5, 2000
267 :     - SMLofNJ.Internals.BTrace.mode (SOME true);
268 :     [autoloading]
269 :     [autoloading done]
270 :     val it = false : bool
271 :     - structure X = struct
272 :     - fun main n = let
273 :     - fun a (x, 0) = d x
274 :     - | a (x, n) = b (x, n - 1)
275 :     - and b (x, n) = c (x, n)
276 :     - and c (x, n) = a (x, n)
277 :     - and d x = e (x, 3)
278 :     - and e (x, 0) = f x
279 :     - | e (x, n) = e (x, n - 1)
280 :     - and f 0 = SMLofNJ.Internals.BTrace.trigger ()
281 :     - | f n = n * g (n - 1)
282 :     - and g n = a (n, 3)
283 :     - in
284 :     - f n
285 :     - end
286 :     - end;
287 :     structure X : sig val main : int -> int end
288 :     - X.main 3;
289 :     *** BACK-TRACE ***
290 :     GOTO stdIn:4.2-13.20: X.main[2].f
291 :     GOTO-( stdIn:4.2-13.20: X.main[2].e
292 :     GOTO stdIn:4.2-13.20: X.main[2].d
293 :     / stdIn:4.2-13.20: X.main[2].a
294 :     | stdIn:4.2-13.20: X.main[2].b
295 :     GOTO-\ stdIn:4.2-13.20: X.main[2].c
296 :     CALL stdIn:4.2-13.20: X.main[2].g
297 :     GOTO stdIn:4.2-13.20: X.main[2].f
298 :     GOTO-( stdIn:4.2-13.20: X.main[2].e
299 :     GOTO stdIn:4.2-13.20: X.main[2].d
300 :     / stdIn:4.2-13.20: X.main[2].a
301 :     | stdIn:4.2-13.20: X.main[2].b
302 :     GOTO-\ stdIn:4.2-13.20: X.main[2].c
303 :     CALL stdIn:4.2-13.20: X.main[2].g
304 :     GOTO stdIn:4.2-13.20: X.main[2].f
305 :     GOTO-( stdIn:4.2-13.20: X.main[2].e
306 :     GOTO stdIn:4.2-13.20: X.main[2].d
307 :     / stdIn:4.2-13.20: X.main[2].a
308 :     | stdIn:4.2-13.20: X.main[2].b
309 :     GOTO-\ stdIn:4.2-13.20: X.main[2].c
310 :     CALL stdIn:4.2-13.20: X.main[2].g
311 :     GOTO stdIn:4.2-13.20: X.main[2].f
312 :     CALL stdIn:2.15-17.4: X.main[2]
313 :     -
314 :    
315 :     (Note that because of a FLINt bug the above code currently does not
316 :     compile without BTrace turned on.)
317 :    
318 :     Here is another example, using my modified Tiger compiler:
319 :    
320 :     Standard ML of New Jersey v110.28.1 [FLINT v1.5], June 5, 2000
321 :     - SMLofNJ.Internals.BTrace.mode (SOME true);
322 :     [autoloading]
323 :     [autoloading done]
324 :     val it = false : bool
325 :     - CM.make "sources.cm";
326 :     [autoloading]
327 :     ...
328 :     [autoloading done]
329 :     [scanning sources.cm]
330 :     [parsing (sources.cm):parse.sml]
331 :     [creating directory CM/SKEL ...]
332 :     [parsing (sources.cm):tiger.lex.sml]
333 :     ...
334 :     [wrote CM/sparc-unix/semant.sml]
335 :     [compiling (sources.cm):main.sml]
336 :     [wrote CM/sparc-unix/main.sml]
337 :     [New bindings added.]
338 :     val it = true : bool
339 :     - Main.compile ("../testcases/merge.tig", "foo.out");
340 :     *** BACK-TRACE ***
341 :     CALL lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trvar
342 :     CALL lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
343 :     CALL lib/semant.sml:289.3-295.22: SemantFun[2].transExp.trexp.check[2]
344 :     GOTO lib/semant.sml:289.3-295.22: SemantFun[2].transExp.trexp.check[2]
345 :     CALL lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
346 :     CALL lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
347 :     CALL lib/semant.sml:488.3-505.6: SemantFun[2].transDec.trdec[2].transBody[2]
348 :     / lib/semant.sml:411.65-543.8: SemantFun[2].transDec
349 :     CALL-\ lib/semant.sml:413.2-540.9: SemantFun[2].transDec.trdec[2]
350 :     CALL lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
351 :     CALL lib/semant.sml:8.52-558.4: SemantFun[2].transProg[2]
352 :     CALL main.sml:1.18-118.4: Main.compile[2]
353 :     -
354 :    
355 :     ----------------------------------------------------------------------
356 : blume 673 Name: Matthias Blumen
357 :     Date: 2000/06/21 18:00:00 JST
358 :     Tag: blume-20000621-manual
359 :     Description:
360 :    
361 :     CM manual update: Path environments documented.
362 :    
363 :     ----------------------------------------------------------------------
364 : blume 666 Name: Matthias Blume
365 : blume 672 Date: 2000/06/19 13:40:00
366 :     Tag: blume-20000619-manual
367 :     Description:
368 :    
369 :     CM manual and system/README update. This only covers the fact that
370 :     there are no more implicit anchors. (Path environments and the "bind"
371 :     option to "cm" have yet to be documented.)
372 :    
373 :     ----------------------------------------------------------------------
374 :     Name: Matthias Blume
375 : blume 671 Date: 2000/06/19 11:05:00 JST
376 :     Tag: blume-20000619-chdir-bugfix
377 :     Description:
378 :    
379 :     Fixed a bug in new SrcPath module that sometimes led to a bad chDir call.
380 :    
381 :     ----------------------------------------------------------------------
382 :     Name: Matthias Blume
383 : blume 670 Date: 2000/06/18 22:00:10 JST
384 :     Tag: blume-20000618-implicit-anchors-really-gone
385 :     Description:
386 :    
387 :     I updates the previous HISTORY entry where I forgot to mention that
388 :     implicit anchors are no longer with us.
389 :    
390 :     The current update also gets rid of the (now useless) controller
391 :     CM.Control.implicit_anchors.
392 :    
393 :     ----------------------------------------------------------------------
394 :     Name: Matthias Blume
395 : blume 666 Date: 2000/06/16 17:30:00 JST
396 :     Tag: blume-20000616-anchorenv
397 :     Description:
398 :    
399 :     This patch implements the long anticipated (just kidding :) "anchor
400 :     environment" mechanism. In the course of doing this, I also
401 :     re-implemented CM's internal "SrcPath" module from scratch. The new
402 :     one should be more robust in certain boundary cases. In any case, it
403 :     is a lot cleaner than its predecessor (IMHO).
404 :    
405 :     This time, although there is yet another boot file format change, I
406 :     kept the unpickler backward-compatible. As a result, no new bootfiles
407 :     are necessary and bootstrapping is straightforward. (You cannot read
408 :     new bootfiles into an old system, but the other way around is no
409 :     problem.)
410 :    
411 :     Visible changes:
412 :    
413 : blume 670 ** 0. Implicit path anchors (without the leading $-symbol) are no
414 :     longer recognized at all. This means that such path names are not
415 :     illegal either. For example, the name basis.cm simply refers to a
416 :     local file called "basis.cm" (i.e, the name is an ordinary path
417 :     relative to .cm-files directory). Or, to put it differently, only
418 :     names that start with $ are anchored paths.
419 : blume 666
420 : blume 670 ** 1. The $<singlearc> abbreviation for $/<singlearc> has finally
421 :     vanished.
422 :    
423 :     John (Reppy) had critizised this as soon as I originally proposed and
424 : blume 666 implemented it, but at that time I did not really deeply believe
425 :     him. :) Now I came full-circle because I need the $<singlearc> syntax
426 :     in another place where it cannot be seen as an abbreviation for
427 :     $/<singlearc>. To avoid the confusion, $<singlearc> now means what it
428 :     seems to mean (i.e., it "expands" into the corresponding anchor
429 :     value).
430 :    
431 :     However, when paths are used as members in CM description files, it
432 :     continues to be true that there must be at least another arc after the
433 :     anchor. This is now enforced separately during semantic analysis
434 : blume 670 (i.e., from a lexical/syntactical point of view, the notation is ok.)
435 : blume 666
436 :     ** 2. The "cm" class now accepts an option "bind". The option's value
437 :     is a sub-option list of precisely two items -- one labeled "anchor"
438 :     and the other one labeled "value". As you might expect, "anchor" is
439 :     used to specify an anchor name to be bound, and "value" specifies what
440 :     the anchor is being bound to.
441 :    
442 :     The value must be a directory name and can be given in either standard
443 :     syntax (including the possibility that it is itself an anchored path)
444 :     or native syntax.
445 :    
446 :     Examples:
447 :    
448 :     foo.cm (bind:(anchor:bar value:$mystuff/bar))
449 :     lib.cm (bind:(anchor:a value:"H:\\x\\y\\z")) (* only works under windows *)
450 :    
451 :     and so on.
452 :    
453 :     The meaning of this is that the .cm-file will be processed with an
454 :     augmented anchor environment where the given anchor(s) is/are bound to
455 :     the given values(s).
456 :    
457 :     The rationale for having this feature is this: Suppose you are trying
458 :     to use two different (already stable) libraries a.cm and b.cm (that
459 :     you perhaps didn't write yourself). Further, suppose each of these
460 :     two libraries internally uses its own auxiliary library $aux/lib.cm.
461 :     Normally you would now have a problem because the anchor "lib" can not
462 :     be bound to more than one value globally. Therefore, the project that
463 :     uses both a.cm and b.cm must locally redirect the anchor to some other
464 :     place:
465 :    
466 :     a.cm (bind:(anchor:lib value:/usr/lib/smlnj/a-stuff))
467 :     b.cm (bind:(anchor:lib value:/usr/lib/smlnj/b-stuff))
468 :    
469 :     This hard-wires $lib/aux.cm to /usr/lib/smlnj/a-stuff/aux.cm or
470 :     /usr/lib/smlnj/b-stuff/aux.cm, respectively.
471 :    
472 :     Hard-wiring path names is a bit inflexible (and CM will verbosely warn
473 :     you when you do so at the time of CM.stabilize). Therefore, you can
474 :     also use an anchored path as the value:
475 :    
476 :     a.cm (bind:(anchor:lib value:$a-lib))
477 :     b.cm (bind:(anchor:lib value:$b-lib))
478 :    
479 :     Now you can globally configure (using the usual CM.Anchor.anchor or
480 :     pathconfig machinery) bindings for "a-lib" and "b-lib". Since "lib"
481 :     itself is always locally bound, setting it globally is no longer
482 :     meaningful or necessary (but it does not hurt either). In fact, "lib"
483 :     can still be used as a global anchor for separate purposes. As a
484 :     matter of fact, one can locally define "lib" in terms of a global
485 :     "lib":
486 :    
487 :     a.cm (bind:(anchor:lib value:$lib/a))
488 :     b.cm (bind:(anchor:lib value:$lib/b))
489 :    
490 :     ** 3: The encoding of path names has changed. This affects the way
491 :     path names are shown in CM's progress report and also the internal
492 :     protocol encoding used for parallel make.
493 :    
494 :     The encoding now uses one or more ':'-separated segments. Each
495 :     segments corresponds to a file that has been specified relative to the
496 :     file given by its preceding segment. The first segment is either
497 :     relative to the CWD, absolute, or anchored. Each segment itself is
498 :     basically a Unix pathname; all segments but the first are relative.
499 :    
500 :     Example:
501 :    
502 :     $foo/bar/baz.cm:a/b/c.sml
503 :    
504 :     This path denotes the file bar/a/b/c.sml relative to the directory
505 :     denoted by anchor "foo". Notice that the encoding also includes
506 :     baz.cm which is the .cm-file that listed a/b/c.sml. As usual, such
507 :     paths are resolved relative to the .cm-files directory, so baz.cm must
508 :     be ignored to get the "real" pathname.
509 :    
510 :     To make this fact more obvious, CM puts the names of such "virtual
511 :     arcs" into parentheses when they appear in progress reports. (No
512 :     parentheses will appear in the internal protocol encoding.) Thus,
513 :     what you really see is:
514 :    
515 :     $foo/bar/(baz.cm):a/b/c.sml
516 :    
517 :     I find this notation to be much more informative than before.
518 :    
519 :     Another new feature of the encoding is that special characters
520 :     including parentheses, colons, (back)slashes, and white space are
521 :     written as \ddd (where ddd is the decimal encoding of the character).
522 :    
523 : blume 670 *** The CM manual still needs to be updated.
524 :    
525 : blume 666 ----------------------------------------------------------------------
526 : leunga 660 Name: Allen Leung
527 :     Date: 2000/06/15 00:38:00
528 :     Tag: leunga-20000615-x86-peephole
529 :    
530 :     x86 Peephole fix by Fermin. Affects c-- and moby only.
531 :    
532 :     ----------------------------------------------------------------------
533 : blume 658 Name: Matthias Blume
534 :     Date: 2000/06/12 11:40:00
535 :     Tag: blume-20000612-parmakefix
536 :     Description:
537 :    
538 :     More cleanup after changing the file naming scheme: This time I
539 :     repaired the parallel make mechanism for CMB.make which I broke earlier.
540 :    
541 :     ----------------------------------------------------------------------
542 : leunga 657 Name: Allen Leung
543 :     Date: 2000/06/09 01:25:00
544 :     Tag: leunga-20000609-various
545 :    
546 :     None of these things should affect normal SML/NJ operations
547 :    
548 :     1. Peephole improvements provided by Fermin (c--)
549 :     2. New annotation DEFUSE for adding extra dependence (moby)
550 :     3. New X86 LOCK instructions (moby)
551 :     4. New machine description language for reservation tables (scheduling)
552 :     5. Fixes to various optimization/analysis modules (branch chaining, dominator
553 :     trees etc.)
554 :     6. I've changed the CM files so that they can work with versions
555 :     110.0.6, 110.25 and 110.28
556 :    
557 :     ----------------------------------------------------------------------
558 : blume 652 Name: Matthias Blume
559 : blume 656 Date: 2000/06/09 12:40:00
560 :     Tag: blume-20000609-log
561 :     Description:
562 :    
563 :     - Removed all(?) remaining RCS Log entries from sources.
564 :    
565 :     - Fixed bug in ml-yacc and ml-lex sources (use explicit anchors for
566 :     anchored paths).
567 :    
568 :     ----------------------------------------------------------------------
569 :     Name: Matthias Blume
570 : blume 653 Date: 2000/06/07 17:00:00 JST
571 :     Tag: blume-20000607-no-implicit-anchors
572 :     Description:
573 :    
574 :     1. This update changes the default setting for
575 :     CM.Control.implicit_anchors from true to false. This means that
576 :     implicit anchors are no longer permitted by default. I also tried to
577 :     make sure that nothing else still relies on implicit anchors.
578 :     (This is the next step on the schedule towards a CM that does not even
579 :     have the notion of implicit anchors anymore.)
580 :    
581 :     2. More CM manual updates.
582 :    
583 :     3. I managed to track down and fix the pickling bug I mentioned last
584 :     time. Because of the previously existing workaround, this entails no
585 :     immediate practical changes.
586 :    
587 :     ----------------------------------------------------------------------
588 :     Name: Matthias Blume
589 : blume 652 Date: 2000/06/06 11:15:00 JST
590 :     Tag: blume-20000606-lazierpickle
591 :     Description:
592 :    
593 :     !!!! NEW BOOT FILES !!!!
594 :    
595 :     * The main purpose of this update is to make library pickles lazier in
596 :     order to reduce the initial space penalty for autoloading a library.
597 :     As a result, it is now possible to have $smlnj/compiler.cm
598 :     pre-registered. This should take care of the many complaints or
599 :     inquiries about missing structure Compiler. This required changes to
600 :     CM's internal data structures and small tweaks to some algorithms.
601 :    
602 :     As a neat additional effect, it is no longer necessary (for the sake
603 :     of lean heap image files) to distinguish between a "minimal" CM and a
604 :     "full" CM. Now, there is only one CM (i.e., the "full" version:
605 :     $smlnj/cm.cm aka $smlnj/cm/full.cm), and it is always available at the
606 :     interactive top level. ($smlnj/cm/minimal.cm is gone.)
607 :    
608 :     To make the life of compiler-hackers easier, "makeml" now also
609 :     pre-registers $smlnj/cmb.cm (aka $smlnj/cmb/current.cm). In other
610 :     words, after you bootstrap a new sml for the first time, you will not
611 :     have to autoload $smlnj/cmb.cm again afterwards. (The first time
612 :     around you will still have to do it, though.)
613 :    
614 :     * A second change consists of major updates to the CM manual. There
615 :     are now several appendices with summary information and also a full
616 :     specification of the CM description file syntax.
617 :    
618 :     * In directory src/system I added the script "allcross". This script
619 :     invokes sml and cross-compiles the compiler for all supported
620 :     architectures. (Useful when providing a new set of boot files.)
621 :    
622 :     * There seems to be a latent bug in my "lazy pickles" mechanism. I
623 :     added a small tweak to pickle-util.sml to work around this problem,
624 :     but it is not a proper fix yet. I will investigate further. (The
625 :     effect of the bug was an inflation of library pickle size.)
626 :    
627 :     * Version number increased to 110.28.1 (to avoid compatibility problems).
628 :    
629 :     ----------------------------------------------------------------------
630 : leunga 646 Name: Allen Leung
631 : leunga 648 Date: 2000/05/25 17:28 EDT
632 :     Tag: leunga-20000525-ra
633 :     Description:
634 :    
635 :     Fixed a bug in freezing phase of the register allocator.
636 :    
637 :     ----------------------------------------------------------------------
638 :     Name: Allen Leung
639 : leunga 647 Date: 2000/05/15 22:53 EDT
640 : leunga 646 Tag: leunga-20000515-alpha-x86-ra
641 :     Description:
642 :    
643 :     1. Alpha
644 :    
645 :     Slight cleanup. Removed the instruction SGNXL
646 :    
647 :     2. X86
648 :    
649 :     Added the following instructions to the instruction set:
650 :    
651 :     ROLx, RORx,
652 :     BTx, BTSx, BTLx, BTRx,
653 :     XCHGx, and variants with the LOCK prefix
654 :    
655 :     3. Register Allocation
656 :    
657 :     The module ra-rewrite-with-renaming has been improved.
658 :    
659 : leunga 647 These have no effect on SML/NJ.
660 :    
661 : leunga 646 ----------------------------------------------------------------------
662 : blume 642 Name: Matthias Blume
663 : blume 645 Date: 2000/05/15 16:20:00 JST
664 :     Tag: blume-20000515-lightrebuild
665 :     Description:
666 :    
667 :     1. I added an alternative to "-rebuild" to "makeml". The difference is
668 :     that prior to calling CMB.make' the CM-variable "LIGHT" will be
669 :     defined. In effect, the command will not build any cross-compiler
670 :     backends and therefore finish more quickly.
671 :    
672 :     The "fixpt" script also takes a "-light" switch to be able to use
673 :     this new facility while compiling for a fixpoint.
674 :    
675 :     2. I replaced all mentions of anchored paths in group owner specifications
676 :     with simple relative paths (usually starting with "..").
677 :     The rationale is that a library's internal workings should not be
678 :     compromised by the lack of some anchor. (An anchor is necessary
679 :     for someone who wants to refer to the library by an anchored path,
680 :     but it should not be necessary to build the same library in the first
681 :     place.)
682 :    
683 :     3. I changed the way CM's tool mechanism determines the shell command
684 :     string used for things like ml-yacc etc. so that it does not break
685 :     when CM.Control.implicit_anchors is turned off.
686 :    
687 :     ----------------------------------------------------------------------
688 :     Name: Matthias Blume
689 : blume 644 Date: 2000/05/12 18:20:00 JST
690 :     Tag: blume-20000512-ml-build
691 :     Description:
692 :    
693 :     Fixed a bug in config/_ml-build that prevented ml-yacc and ml-lex from
694 :     getting installed properly (by config/install.sh).
695 :    
696 :     ----------------------------------------------------------------------
697 :     Name: Matthias Blume
698 : blume 643 Date: 2000/05/12 17:30:00 JST
699 :     Tag: blume-20000512-anchors
700 :     Description:
701 :    
702 :     !!! NEW BOOT FILES !!!
703 :    
704 :     This change is in preparation of fading out support for "implicitly
705 :     anchored path names". I went through all sources and used the
706 :     explicit (and relatively new) $-notation. See system/README and the
707 :     CM manual for more info on this.
708 :    
709 :     I also modified the anchoring scheme for some things such as "smlnj",
710 :     "MLRISC", "cm", etc. to take advantage of the fact that explicit
711 :     anchors are more expressive: anchor name and first arc do not have to
712 :     coincide. This entails the following user-visible change:
713 :    
714 :     You have to write $smlnj/foo/bar instead of smlnj/foo/bar. In
715 :     particular, when you fire up sml with a command-line argument, say,
716 :     e.g.:
717 :    
718 :     sml '$smlnj/cmb.cm'
719 :    
720 :     At the ML toplevel prompt:
721 :    
722 :     CM.autoload "$smlnj/cmb.cm";
723 :    
724 :     There is also a new controller in CM.Control that can be used to turn
725 :     off all remaining support for implicit anchors by saying:
726 :    
727 :     CM.autoload "$smlnj/
728 :     #set CM.Control.implicit_anchors false;
729 :    
730 :     This causes CM to reject implicitly anchored paths. This is (for the
731 :     time being) less permissive than the "final" version where there will
732 :     be no more such implicit anchors and relative paths will be just that:
733 :     relative.
734 :    
735 :     The next step (version after next version?) will be to make the
736 :     default for CM.Control.implicit_anchors false. After the dust has
737 :     settled, I can then produce the "final" version of this...
738 :    
739 :     Note: Since bootstrapping is a bit tricky, I provided new boot files.
740 :    
741 :     ----------------------------------------------------------------------
742 :     Name: Matthias Blume
743 : blume 642 Date: 2000/05/11 16:30:00 JST
744 :     Tag: blume-20000511-sources
745 :     Description:
746 :    
747 :     The main change is that I added function CM.sources as a generalized
748 :     version of the earlier CM.makedepend. This entails the following
749 :     additional changes:
750 :    
751 :     - CM.makedepend has been dropped.
752 :    
753 :     - CM manual has been updated.
754 :    
755 :     - TOOLS signature and API have been changed.
756 :    
757 :     ----------------------------------------------------------------------
758 : leunga 640 Name: Allen Leung
759 : leunga 641 Date: 2000/05/10 21:17 EDT
760 :     Tag: leunga-20000510-moby-c--ssa
761 :     Description:
762 :    
763 :     Various bug fixes and new features for C--, Moby and MLRISC optimizations.
764 :     None of these affect SML/NJ.
765 :    
766 :     1. Register Allocation
767 :    
768 :     a. A new ra spilling module (ra/ra-spill-with-renaming) is implemented.
769 :     This module tries to remove local (i.e. basic block level) redundancies
770 :     during spilling.
771 :    
772 :     b. A new framework for performing region based register allocation.
773 :     Not yet entirely functional.
774 :    
775 :     2. X86
776 :    
777 :     a. DefUse for POP was missing the stack pointer [found by Lal]
778 :     b. Reload for CALL was incorrect in X86Spill [found by John]
779 :     c. Various fixes in X86Spill so that it can be used correctly for
780 :     the new spilling module.
781 :    
782 :     3. SSA/IR
783 :    
784 :     a. New module ir/dj-dataflow.sml implements elimination based
785 :     data flow analysis.
786 :    
787 :     4. MLRiscGen
788 :    
789 :     a. Fix for gc type annotation
790 :    
791 :     5. MDGen
792 :    
793 :     Various fixes for machine description -> ml code translation. For ssa
794 :     only.
795 :    
796 :     ----------------------------------------------------------------------
797 :     Name: Allen Leung
798 : leunga 640 Date: 2000/05/08 22:17 EDT
799 :     Tag: leunga-20000508-labexp
800 :     Description:
801 :    
802 :     Fermin has found a few assembly problems with constant expressions
803 :     generated in LabelExp. Mostly, the problems involve extra parentheses,
804 :     which choke on dumb assemblers. This is his fix.
805 :    
806 :     ----------------------------------------------------------------------
807 : dbm 635 Name: Dave MacQueen
808 :     Date: 2000/04/09 14:00 EDT
809 :     Tag: dbm-20000502-Version_110_28
810 :     Description:
811 :    
812 :     1. Updated src/compiler/TopLevel/main/version.sml to version 110.28
813 :    
814 :     2. Updated config/version to 110.28
815 :    
816 :     3. Updated config/srcarchiveurl
817 :    
818 :     3. New boot files!
819 :     ftp://ftp.research.bell-labs.com/dist/smlnj/working/110.28/
820 :    
821 :     ----------------------------------------------------------------------
822 : blume 634 Name: Matthias Blume
823 :     Date: 2000/05/01 19:05:00 JST
824 :     Tag: blume-20000501-noweb
825 :     Description:
826 :    
827 :     A new noweb tool has been added. The existing system is entirely
828 :     unaffected by this, but some CM users have asked for renewed noweb
829 :     support. Everything is documented in the CM manual.
830 :    
831 :     New (plugin) libraries:
832 :    
833 :     noweb-tool.cm
834 :     nw-ext.cm
835 :    
836 :     ----------------------------------------------------------------------
837 : dbm 633 Name: Dave MacQueen
838 :     Date: 2000/04/30 12:40PM EDT
839 :     Tag: dbm-20000430-bug_fixes
840 :     Description:
841 :    
842 :     1. Fix for bug 1498
843 :     smlnj/src/system/Basis/Implementation/Unsafe/object.sig
844 :     smlnj/src/system/Basis/Implementation/Unsafe/object.sml
845 :     added toRealArray function
846 :     smlnj/src/compiler/MiscUtil/print/ppobj.sml
847 :     added check for tag Obj.RealArray to array printing case in ppObj
848 :    
849 :     2. Fix for bug 1510
850 :     smlnj/src/compiler/Semant/types/typesutil.sml
851 :     fixed definition of dummyargs (used by equalTycon) so that
852 :     dummy args are distinct types
853 :    
854 :     ----------------------------------------------------------------------
855 : blume 629 Name: Matthias Blume
856 : blume 632 Date: 2000/04/30 01:00:00 JST
857 :     Tag: blume-20000430-versions
858 :     Description:
859 :    
860 :     1. CM version numbering added. This is an implementation of Lal's
861 :     proposal for adding version numbers and version checking to .cm
862 :     files. Lal said that his proposal was just that -- a proposal.
863 :     For the time being I went ahead and implemented it so that people
864 :     can comment on it. Everything is completely backward-compatible
865 :     (except for the stable library format, i.e., new bootfiles!).
866 :    
867 :     As usual, see the CM manual for details.
868 :    
869 :     2. An alternative syntax for anchored paths has been implemented.
870 :     Dave has recently voiced the same concerns that I had when I did
871 :     this, so there should be some support. My take is that eventually
872 :     I will let support for the current syntax (where anchors are
873 :     "implicit") fade out in favor of the new, explicit syntax.
874 :     In order to be backward-compatible, both old and new syntax are
875 :     currently supported.
876 :    
877 :     Again, see the CM manual for details.
878 :    
879 :     3. Parallel make is trying to be slightly smarter: When the master
880 :     process finds a "bottleneck", i.e., when there is only one
881 :     compilation unit that can be compiled and everybody else is
882 :     waiting on it, then it will simply compile it directly instead
883 :     of clumsily telling one of the slaves to do it.
884 :    
885 :     4. Support for "unsharing" added. This is necessary in order to be
886 :     able to have two different versions of the same library running
887 :     at the same time (e.g., for trying out a new MLRISC while still
888 :     having the old MLRISC linked into the current compiler, etc.)
889 :     See the CM manual.
890 :    
891 :     5. Simple "makedepend" functionality added for generating Makefile
892 :     dependency information. (This is rather crude at the moment.
893 :     Expect some changes here in the future.)
894 :    
895 :     6. ".fun" added as a recognized suffix for ML files. Also documented
896 :     explicitly in the manual that the fallback behavior (unknown suffix
897 :     -> ML file) is not an official feature!
898 :    
899 :     7. Small changes to the pickler for stable libraries.
900 :    
901 :     8. Several internal changes to CM (for cleanup/improvement).
902 :    
903 :    
904 :     !!!! NEW BINFILES !!!!
905 :    
906 :     ----------------------------------------------------------------------
907 :     Name: Matthias Blume
908 : blume 631 Date: 2000/04/28 17:30:00 JST
909 :     Tag: blume-20000428-pathconfig
910 :     Description:
911 :    
912 :     1. I changed config/install.sh to remove duplicate entries from the
913 :     lib/pathconfig file at the end. Moreover, the final version of
914 :     lib/pathconfig is sorted alphabetically. The same (sorting) is done
915 :     in src/system/installml.
916 :    
917 :     2. The config/install.sh script now consistently uses relative
918 :     pathnames in lib/pathconfig whenever the anchor is in the lib
919 :     directory. (So far this was true for the libraries that come
920 :     pre-compiled and bundled as part of the bootfiles but not for
921 :     libraries that are compiled by the script itself.)
922 :    
923 :     ----------------------------------------------------------------------
924 :     Name: Matthias Blume
925 : blume 629 Date: 2000/04/26 13:10:00 JST
926 :     Tag: blume-20000426-fun_suffix
927 :     Description:
928 :    
929 :     Added ".fun" as a recognized file name suffix (for ML code).
930 :    
931 :     ----------------------------------------------------------------------
932 : leunga 628 Name: Allen Leung
933 :     Date: 2000/04/25 17:00:00 EST
934 :     Tag: leunga-20000425-alpha-ra
935 :     Description:
936 :    
937 :     1. Alpha
938 :    
939 :     PSEUDOARITH was missing in AlphaRewrite. This causes an endless loop
940 :     in C--.
941 :    
942 :     2. RA
943 :    
944 :     Added a flag "ra-dump-size" to print out the size of the flowgraph
945 :     and the interference graph.
946 :    
947 :     ----------------------------------------------------------------------
948 : dbm 627 Name: Dave MacQueen
949 :     Date: 2000/04/25/
950 :     Tag: dbm-20000425-mlyacc_doc_examples
951 :     Description:
952 :     Updated mlyacc.tex sections 5 and 7 for SML '97 and CM.
953 :     Updated all three examples in src/ml-yacc/examples to run
954 :     under 110.* using CM.make.
955 :    
956 :     ----------------------------------------------------------------------
957 : leunga 624 Name: Allen Leung
958 :     Date: 2000/04/20 23:04:00 EST
959 :     Tag: leunga-20000420-ssa-c---stuff
960 :     Description:
961 :    
962 :     This update synchronizes my repository with Yale's. Most of these
963 :     changes, however, do not affect SML/NJ at all (the RA is an exception).
964 :    
965 :     1. Register Allocator
966 :    
967 :     a. An improvement in the interference graph construction:
968 :     Given a copy
969 :    
970 :     s <- t
971 :    
972 : leunga 628 no interference edge between s and t is added for this definition of s.
973 : leunga 624
974 :     b. I've added two new spill heuristic modules that Fermin and I developed
975 :     (in the new library RA.cm). These are unused in SML/NJ but maybe
976 :     useful for others (Moby?)
977 :    
978 :     2. X86
979 :    
980 :     a. Various fixes in the backend provided by Fermin [C--] and Lal.
981 :    
982 :     3. Alpha
983 :    
984 :     a. Added the BSR instruction and code generation that goes with it [C--]
985 :     b. Other fixes too numerous to recount provided by Fermin [C--]
986 :    
987 :     4. Regmaps
988 :    
989 :     a. The regmaps are not initialized with the identity physical bindings
990 :     at creation time. This is unneeded.
991 :    
992 :     5. MLRISC Optimizations
993 :    
994 :     a. The DJ-Graph module can now compute the iterated dominance frontiers
995 :     intersects with liveness incrementally in linear time! Woohoo!
996 :     This is now used in my new SSA construction algorithm.
997 :    
998 :     b. THe branch reorganization module is now smarter about linear chains of
999 :     basic blocks.
1000 :    
1001 :    
1002 :     ----------------------------------------------------------------------
1003 : blume 615 Name: Matthias Blume
1004 :     Date: 2000/04/12 13:52:00 JST
1005 :     Tag: blume_main_v110p27_1
1006 :     Description:
1007 :    
1008 :     Changed install.sh script to handle archive files without version number
1009 :     and to use "boot.<arch>-<os>" instead of "sml.boot.<arch>-<os>" for the
1010 :     name of the boot file archive.
1011 :    
1012 :     ----------------------------------------------------------------------
1013 : dbm 607 Name: Dave MacQueen
1014 :     Date: 2000/04/09 14:00 EDT
1015 :     Tag: dbm-20000410-Version_110_27
1016 :     Description:
1017 :    
1018 :     1. Updated src/compiler/TopLevel/main/version.sml to version 110.27
1019 :    
1020 :     2. Updated src/config/version to 110.27
1021 :    
1022 :     3. New boot files!
1023 :    
1024 :     ----------------------------------------------------------------------
1025 : leunga 606 Name: Allen Leung
1026 :     Date: 2000/04/09 19:09:00 EST
1027 :     Tag: leunga-20000409-misc
1028 :     Description:
1029 :    
1030 :     1. Yet another fix for x86 assembly for idivl, imull, mull and friends.
1031 :    
1032 :     2. Miscellaneous improvements to MLRISC (unused in sml/nj)
1033 :    
1034 :     ----------------------------------------------------------------------
1035 : monnier 605 Name: Stefan
1036 :     Date: 2000/04/07 10:00:00 EDT
1037 :     Tag: monnier-20000406-branch-handling
1038 :     Description:
1039 :    
1040 :     Improved handling of branches (mostly those generated from
1041 :     polymorphic equality), removed switchoff and changed the
1042 :     default optimization settings (more cpsopt and less flintopt).
1043 :    
1044 :     ----------------------------------------------------------------------
1045 : leunga 601 Name: Allen Leung
1046 : leunga 602 Date: 2000/04/06 01:30:00 EST
1047 :     Tag: leunga-20000406-peephole-x86-SSA-2
1048 :     Description:
1049 :    
1050 :     Forgot a few files.
1051 :    
1052 :     ----------------------------------------------------------------------
1053 :     Name: Allen Leung
1054 : leunga 601 Date: 2000/04/06 00:36:00 EST
1055 :     Tag: leunga-20000406-peephole-x86-SSA
1056 :     Description:
1057 :    
1058 :     1. New Peephole code
1059 :    
1060 :     2. Minor improvement to X86 instruction selection
1061 :    
1062 :     3. Various fixes to SSA and machine description -> code translator
1063 :    
1064 :     ----------------------------------------------------------------------
1065 : blume 595 Name: Matthias Blume
1066 :     Date: 2000/04/05 12:30:00 JST
1067 :     Tag: blume_main_v110p26p2_3
1068 :     Description:
1069 :    
1070 :     This update just merges three minor cosmetic updates to CM's sources
1071 :     to get ready for the 110.27 code freeze on Friday. No functionality
1072 :     has changed.
1073 :    
1074 :     ----------------------------------------------------------------------
1075 : leunga 593 Name: Allen Leung
1076 : leunga 594 Date: 2000/04/04 19:39:00 EST
1077 :     Tag: leunga-20000404-x86-asm
1078 :     Description:
1079 :    
1080 :     1. Fixed a problem in X86 assembly.
1081 :    
1082 :     Things like
1083 :    
1084 :     jmp %eax
1085 :     jmp (%eax)
1086 :    
1087 :     should be output as
1088 :    
1089 :     jmp *%eax
1090 :     jmp *(%eax)
1091 :    
1092 :     2. Assembly output
1093 :    
1094 :     Added a new flag
1095 :    
1096 :     "asm-indent-copies" (default to false)
1097 :    
1098 :     When this flag is on, parallel copies will be indented an extra level.
1099 :    
1100 :     ----------------------------------------------------------------------
1101 :     Name: Allen Leung
1102 : leunga 593 Date: 2000/04/04 03:18:00 EST
1103 :     Tag: leunga-20000404-C--Moby
1104 :     Description:
1105 :    
1106 :     All of these fixes are related to C--, Moby, and my own optimization
1107 :     stuff; so they shouldn't affect SML/NJ.
1108 :    
1109 :     1. X86
1110 :    
1111 :     Various fixes related floating point, and extensions.
1112 :    
1113 :     2. Alpha
1114 :    
1115 :     Some extra patterns related to loads with signed/zero extension
1116 :     provided by Fermin.
1117 :    
1118 :     3. Assembly
1119 :    
1120 : monnier 659 When generating assembly, resolve the value of client defined constants,
1121 : leunga 593 instead of generating symbolic values. This is controlled by the
1122 :     new flag "asm-resolve-constants", which is default to true.
1123 :    
1124 :     4. Machine Descriptions
1125 :    
1126 :     a. The precedence parser was slightly broken when parsing infixr symbols.
1127 :     b. The type generalizing code had the bound variables reversed, resulting
1128 :     in a problem during arity raising.
1129 :     c. Various fixes in machine descriptions.
1130 :    
1131 :     ----------------------------------------------------------------------
1132 : blume 592 Name: Matthias Blume
1133 :     Date: 2000/04/03 16:05:00 JST
1134 :     Tag: blume_main_v110p26p2_2
1135 :     Description:
1136 :    
1137 :     I eliminated coreEnv from compInfo. Access to the "Core" structure is
1138 :     now done via the ordinary static environment that is context to each
1139 :     compilation unit.
1140 :    
1141 :     To this end, I arranged that instead of "structure Core" as "structure
1142 :     _Core" is bound in the pervasive environment. Core access is done via
1143 : monnier 659 _Core (which can never be accidentally rebound because _Core is not a
1144 : blume 592 legal surface-syntax symbol).
1145 :    
1146 :     The current solution is much cleaner because the core environment is
1147 :     now simply part of the pervasive environment which is part of every
1148 :     compilation unit's context anyway. In particular, this eliminates all
1149 :     special-case handling that was necessary until now in order to deal
1150 :     with dynamic and symbolic parts of the core environment.
1151 :    
1152 :     Remaining hackery (to bind the "magic" symbol _Core) is localized in the
1153 : monnier 659 compilation manager's bootstrap compiler (actually: in the "init group"
1154 : blume 592 handling). See the comments in src/system/smlnj/init/init.cmi for
1155 :     more details.
1156 :    
1157 :     I also tried to track down all mentions of "Core" (as string argument
1158 :     to Symbol.strSymbol) in the compiler and replaced them with a
1159 :     reference to the new CoreSym.coreSym. Seems cleaner since the actual
1160 :     name appears in one place only.
1161 :    
1162 :     Binfile and bootfile format have not changed, but the switchover from
1163 :     the old "init.cmi" to the new one is a bit tricky, so I supplied new
1164 :     bootfiles anyway.
1165 :    
1166 :     ----------------------------------------------------------------------
1167 : leunga 591 Name: Allen Leung
1168 :     Date: 2000/04/02 21:17:00 EST
1169 :     Tag: leunga-20000402-mltree
1170 :     Description:
1171 : leunga 585
1172 : leunga 591 1. Renamed the constructor CALL in MLTREE by popular demand.
1173 :     2. Added a bunch of files from my repository. These are currently
1174 :     used by other non-SMLNJ backends.
1175 :    
1176 : leunga 576 ----------------------------------------------------------------------
1177 : leunga 590 Name: Allen Leung
1178 :     Date: 2000/03/31 21:15:00 EST
1179 :     Tag: leunga-20000331-aliasing
1180 :     Description:
1181 :    
1182 :     This update contains a rewritten (and hopefully more correct) module
1183 :     for extracting aliasing information from CPS.
1184 :    
1185 :     To turn on this feature:
1186 :    
1187 :     Compiler.Control.CG.memDisambiguate := true
1188 :    
1189 :     To pretty print the region information with assembly
1190 :    
1191 :     Compiler.Control.MLRISC.getFlag "asm-show-region" := true;
1192 :    
1193 :     To control how many levels of aliasing information are printed, use:
1194 :    
1195 :     Compiler.Control.MLRISC.getInt "points-to-show-level" := n
1196 :    
1197 :     The default of n is 3.
1198 :    
1199 :     ----------------------------------------------------------------------
1200 : dbm 589 Name: David MacQueen
1201 :     Date: 2000/03/31 11:15:00 EST
1202 :     Tag: dbm-20000331-runtime_fix
1203 :     Description:
1204 :    
1205 :     This update contains:
1206 :    
1207 :     1. runtime/c-lib/c-libraries.c
1208 :     includes added in revision 1.2 caused compilation errors on hppa-hpux
1209 :    
1210 :     2. fix for bug 1556
1211 :     system/Basis/Implementation/NJ/internal-signals.sml
1212 :    
1213 :     ----------------------------------------------------------------------
1214 : blume 587 Name: Matthias Blume
1215 : blume 588 Date: 2000/03/31 18:00:00 JST
1216 :     Tag: blume_main_v110p26p2_1
1217 :     Description:
1218 :    
1219 :     This update contains:
1220 :    
1221 :     1. A small change to CM's handling of stable libraries:
1222 :     CM now maintains one "global" modmap that is used for all stable
1223 :     libraries. The use of such a global modmap maximizes sharing and
1224 :     minimizes the need for re-traversing parts of environments during
1225 :     modmap construction. (However, this has minor impact since modmap
1226 :     construction seems to account for just one percent or less of total
1227 :     compile time.)
1228 :    
1229 :     2. I added a "genmap" phase to the statistics. This is where I got the
1230 :     "one percent" number (see above).
1231 :    
1232 :     3. CM's new tool parameter mechanism just became _even_ better. :)
1233 :     - The parser understands named parameters and recursive options.
1234 :     - The "make" and "shell" tools use these new features.
1235 :     (This makes it a lot easier to cascade these tools.)
1236 :     - There is a small syntax change: named parameters use a
1237 :    
1238 :     <name> : ( <option> ... ) or
1239 :     <name> : <string>
1240 :    
1241 :     syntax. Previously, named parameters were implemented in an
1242 :     ad-hoc fashion by each tool individually (by parsing strings)
1243 :     and had the form
1244 :    
1245 :     <name>=<string>
1246 :    
1247 :     See the CM manual for a full description of these issues.
1248 :    
1249 :     ----------------------------------------------------------------------
1250 :     Name: Matthias Blume
1251 : blume 587 Date: 2000/03/30 18:00:00 JST
1252 :     Tag: blume_main_v110p26p2_0
1253 :     Description:
1254 :    
1255 :     !!!!! WARNING !!!!!!
1256 :     !! New binfiles !!
1257 :     !!!!!!!!!!!!!!!!!!!!
1258 :    
1259 :     This update contains:
1260 :    
1261 :     1. Moderate changes to CM:
1262 :    
1263 :     - Changes to CM's tools mechanism. In particular, it is now possible
1264 :     to have tools that accept additional "command line" parameters
1265 :     (specified in the .cm file at each instance where the tool's class is
1266 :     used).
1267 :    
1268 : monnier 659 This was done to accommodate the new "make" and "shell" tools which
1269 :     facilitate fairly seamless hookup to portions of code managed using
1270 : blume 587 Makefiles or Shell scripts.
1271 :    
1272 :     There are no classes "shared" or "private" anymore. Instead, the
1273 :     sharing annotation is now a parameter to the "sml" class.
1274 :    
1275 :     There is a bit of generic machinery for implementing one's own
1276 :     tools that accept command-line parameters. However, I am not yet fully
1277 :     satisfied with that part, so expect changes here in the future.
1278 :    
1279 :     All existing tools are described in the CM manual.
1280 :    
1281 : monnier 659 - Slightly better error handling. (CM now suppresses many followup
1282 : blume 587 error messages that tended to be more annoying than helpful.)
1283 :    
1284 :     2. Major changes to the compiler's static environment data structures.
1285 :    
1286 :     - no CMStaticEnv anymore.
1287 :     - no CMEnv, no "BareEnvironment" (actually, _only_ BareEnvironment,
1288 :     but it is called Environment), no conversions between different
1289 :     kinds of static environments
1290 :    
1291 :     - There is still a notion of a "modmap", but such modmaps are generated
1292 :     on demand at the time when they are needed. This sounds slow, but I
1293 :     sped up the code that generates modmaps enough for this not to lead to
1294 :     a slowdown of the compiler (at least I didn't detect any).
1295 :    
1296 :     - To facilitate rapid modmap generation, static environments now
1297 :     contain an (optional) "modtree" structure. Modtree annotations are
1298 :     constructed by the unpickler during unpickling. (This means that
1299 :     the elaborator does not have to worry about modtrees at all.)
1300 :     Modtrees have the advantage that they are compositional in the same
1301 :     way as the environment data structure itself is compositional.
1302 :     As a result, modtrees never hang on to parts of an environment that
1303 :     has already been rendered "stale" by filtering or rebinding.
1304 :    
1305 :     - I went through many, many trials and errors before arriving at the
1306 :     current solution. (The initial idea of "linkpaths" did not work.)
1307 :     But the result of all this is that I have touched a lot of files that
1308 :     depend on the "modules" and "types" data structures (most of the
1309 :     elaborator). There were a lot of changes during my "linkpath" trials
1310 :     that could have been reverted to their original state but weren't.
1311 :     Please, don't be too harsh on me for messing with this code a bit more
1312 :     than what was strictly necessary... (I _did_ resist the tempation
1313 :     of doing any "global reformatting" to avoid an untimely death at
1314 :     Dave's hands. :)
1315 :    
1316 :     - One positive aspect of the previous point: At least I made sure that
1317 :     all files that I touched now compile without warnings (other than
1318 :     "polyEqual").
1319 :    
1320 :     - compiler now tends to run "leaner" (i.e., ties up less memory in
1321 :     redundant modmaps)
1322 :    
1323 :     ----------------------------------------------------------------------
1324 : leunga 580 Name: Allen Leung
1325 : leunga 585 Date: 2000/03/29 18:00:00
1326 :     Tag: leunga-20000327-mlriscGen_hppa_alpha_x86
1327 : leunga 586 Boot files (optional): ftp://react-ilp.cs.nyu.edu/leunga/110.26.1-sml.boot.x86-unix-20000330.tar.gz
1328 : leunga 585 Description:
1329 :    
1330 :     This update contains *MAJOR* changes to the way code is generated from CPS
1331 :     in the module mlriscGen, and in various backend modules.
1332 :    
1333 :     CHANGES
1334 :     =======
1335 :    
1336 :     1. MLRiscGen: forward propagation fix.
1337 :    
1338 :     There was a bug in forward propagation introduced at about the same time
1339 :     as the MLRISC x86 backend, which prohibits coalescing to be
1340 :     performed effectively in loops.
1341 :    
1342 :     Effect: speed up of loops in RISC architectures.
1343 :     By itself, this actually slowed down certain benchmarks on the x86.
1344 :    
1345 :     2. MLRiscGen: forward propagating addresses from consing.
1346 :    
1347 :     I've changed the way consing code is generated. Basically I separated
1348 :     out the initialization part:
1349 :    
1350 :     store tag, offset(allocptr)
1351 :     store elem1, offset+4(allocptr)
1352 :     store elem2, offset+8(allocptr)
1353 :     ...
1354 :     store elemn, offset+4n(allocptr)
1355 :    
1356 :     and the address computation part:
1357 :    
1358 :     celladdr <- offset+4+alloctpr
1359 :    
1360 :     and move the address computation part
1361 :    
1362 :     Effect: register pressure is generally lower as a result. This
1363 :     makes compilation of certain expressions much faster, such as
1364 :     long lists with non-trivial elements.
1365 :    
1366 :     [(0,0), (0,0), .... (0,0)]
1367 :    
1368 :     3. MLRiscGen: base pointer elimination.
1369 :    
1370 :     As part of the linkage mechanism, we generate the sequence:
1371 :    
1372 :     L: ... <- start of the code fragment
1373 :    
1374 :     L1:
1375 :     base pointer <- linkreg - L1 + L
1376 :    
1377 :     The base pointer was then used for computing relocatable addresses
1378 :     in the code fragment. Frequently (such as in lots of continuations)
1379 :     this is not needed. We now eliminate this sequence whenever possible.
1380 :    
1381 :     For compile time efficiency, I'm using a very stupid local heuristic.
1382 :     But in general, this should be done as a control flow analysis.
1383 :    
1384 :     Effect: Smaller code size. Speed up of most programs.
1385 :    
1386 :     4. Hppa back end
1387 :    
1388 :     Long jumps in span dependence resolution used to depend on the existence
1389 :     of the base pointer.
1390 :    
1391 :     A jump to a long label L was expanded into the following sequence:
1392 :    
1393 :     LDIL %hi(L-8192), %r29
1394 :     LDO %lo(L-8192)(%r29), %r29
1395 :     ADD %r29, baseptr, %r29
1396 :     BV,n %r0(%r29)
1397 :    
1398 :     In the presence of change (3) above, this will not work. I've changed
1399 :     it so that the following sequence of instructions are generated, which
1400 :     doesn't mention the base pointer at all:
1401 :    
1402 :     BL,n L', %r29 /* branch and link, L' + 4 -> %r29 */
1403 :     L': ADDIL L-(L'+4), %r29 /* Compute address of L */
1404 :     BV,n %r0(%r29) /* Jump */
1405 :    
1406 :     5. Alpha back end
1407 :    
1408 :     New alpha instructions LDB/LDW have been added, as per Fermin's
1409 :     suggestions. This is unrelated to all other changes.
1410 :    
1411 :     6. X86 back end
1412 :    
1413 :     I've changed andl to testl in the floating point test sequence
1414 :     whenever appropriate. The Intel optimization guide states that
1415 : monnier 659 testl is preferable to andl.
1416 : leunga 585
1417 :     7. RA (x86 only)
1418 :    
1419 :     I've improved the spill propagation algorithm, using an approximation
1420 :     of maximal weighted independent sets. This seems to be necessary to
1421 :     alleviate the negative effect in light of the slow down in (1).
1422 :    
1423 :     I'll write down the algorithm one of these days.
1424 :    
1425 :     8. MLRiscGen: frequencies
1426 :    
1427 :     I've added an annotation that states that all call gc blocks have zero
1428 :     execution frequencies. This improves register allocation on the x86.
1429 :    
1430 :     BENCHMARKS
1431 :     ==========
1432 :    
1433 :     I've only perform the comparison on 110.25.
1434 :    
1435 :     The platforms are:
1436 :    
1437 :     HPPA A four processor HP machine (E9000) with 5G of memory.
1438 :     X86 A 300Hhz Pentium II with 128M of memory, and
1439 :     SPARC An Ultra sparc 2 with 512M of memory.
1440 :    
1441 :     I used the following parameters for the SML benchmarks:
1442 :    
1443 :     @SMLalloc
1444 :     HPPA 256k
1445 :     SPARC 512k
1446 :     X86 256k
1447 :    
1448 :     COMPILATION TIME
1449 :     ----------------
1450 :     Here are the numbers comparing the compilation times of the compilers.
1451 :     I've only compared 110.25 compiling the new sources versus
1452 :     a fixpoint version of the new compiler compiling the same.
1453 :    
1454 :     110.25 New
1455 :     Total Time in RA Spill+Reload Total Time In RA Spill+Reload
1456 :     HPPA 627s 116s 2684+3584 599s 95s 1003+1879
1457 :     SPARC 892s 173s 2891+3870 708s 116s 1004+1880
1458 :     X86 999s 315s 94006+130691 987s 296s 108877+141957
1459 :    
1460 :     110.25 New
1461 :     Code Size Code Size
1462 :     HPPA 8596736 8561421
1463 :     SPARC 8974299 8785143
1464 :     X86 9029180 8716783
1465 :    
1466 :     So in summary, things are at least as good as before. Dramatic
1467 :     reduction in compilation is obtained on the Sparc; I can't explain it,
1468 :     but it is reproducible. Perhaps someone should try to reproduce this
1469 :     on their own machines.
1470 :    
1471 :     SML BENCHMARKS
1472 :     --------------
1473 :    
1474 :     On the average, all benchmarks perform at least as well as before.
1475 :    
1476 :     HPPA Compilation Time Spill+Reload Run Time
1477 :     110.25 New 110.25 New 110.25 New
1478 :    
1479 :     barnesHut 3.158 3.015 4.75% 1+1 0+0 2.980 2.922 2.00%
1480 :     boyer 6.152 5.708 7.77% 0+0 0+0 0.218 0.213 2.34%
1481 :     count-graphs 1.168 1.120 4.32% 0+0 0+0 22.705 23.073 -1.60%
1482 :     fft 0.877 0.792 10.74% 1+3 1+3 0.602 0.587 2.56%
1483 :     knuthBendix 3.180 2.857 11.32% 0+0 0+0 0.675 0.662 2.02%
1484 :     lexgen 6.190 5.290 17.01% 0+0 0+0 0.913 0.788 15.86%
1485 :     life 0.803 0.703 14.22% 25+25 0+0 0.153 0.140 9.52%
1486 :     logic 2.048 2.007 2.08% 6+6 1+1 4.133 4.008 3.12%
1487 :     mandelbrot 0.077 0.080 -4.17% 0+0 0+0 0.765 0.712 7.49%
1488 :     mlyacc 22.932 20.937 9.53% 154+181 32+57 0.468 0.430 8.91%
1489 :     nucleic 5.183 5.060 2.44% 2+2 0+0 0.125 0.120 4.17%
1490 :     ratio-regions 3.357 3.142 6.84% 0+0 0+0 116.225 113.173 2.70%
1491 :     ray 1.283 1.290 -0.52% 0+0 0+0 2.887 2.855 1.11%
1492 :     simple 6.307 6.032 4.56% 28+30 5+7 3.705 3.658 1.28%
1493 :     tsp 0.888 0.862 3.09% 0+0 0+0 7.040 6.893 2.13%
1494 :     vliw 24.378 23.455 3.94% 106+127 25+45 2.758 2.707 1.91%
1495 :     --------------------------------------------------------------------------
1496 :     Average 6.12% 4.09%
1497 :    
1498 :     SPARC Compilation Time Spill+Reload Run Time
1499 :     110.25 New 110.25 New 110.25 New
1500 :    
1501 :     barnesHut 3.778 3.592 5.20% 2+2 0+0 3.648 3.453 5.65%
1502 :     boyer 6.632 6.110 8.54% 0+0 0+0 0.258 0.242 6.90%
1503 :     count-graphs 1.435 1.325 8.30% 0+0 0+0 33.672 34.737 -3.07%
1504 :     fft 0.980 0.940 4.26% 3+9 2+6 0.838 0.827 1.41%
1505 :     knuthBendix 3.590 3.138 14.39% 0+0 0+0 0.962 0.967 -0.52%
1506 :     lexgen 6.593 6.072 8.59% 1+1 0+0 1.077 1.078 -0.15%
1507 :     life 0.972 0.868 11.90% 26+26 0+0 0.143 0.140 2.38%
1508 :     logic 2.525 2.387 5.80% 7+7 1+1 5.625 5.158 9.05%
1509 :     mandelbrot 0.090 0.093 -3.57% 0+0 0+0 0.855 0.728 17.39%
1510 :     mlyacc 26.732 23.827 12.19% 162+189 32+57 0.550 0.560 -1.79%
1511 :     nucleic 6.233 6.197 0.59% 3+3 0+0 0.163 0.173 -5.77%
1512 :     ratio-regions 3.780 3.507 7.79% 0+0 0+0 133.993 131.035 2.26%
1513 :     ray 1.595 1.550 2.90% 1+1 0+0 3.440 3.418 0.63%
1514 :     simple 6.972 6.487 7.48% 29+32 5+7 3.523 3.525 -0.05%
1515 :     tsp 1.115 1.063 4.86% 0+0 0+0 7.393 7.265 1.77%
1516 :     vliw 27.765 24.818 11.87% 110+135 25+45 2.265 2.135 6.09%
1517 :     ----------------------------------------------------------------------------
1518 :     Average 6.94% 2.64%
1519 :    
1520 :     X86 Compilation Time Spill+Reload Run Time
1521 :     110.25 New 110.25 New 110.25 New
1522 :    
1523 :     barnesHut 5.530 5.420 2.03% 593+893 597+915 3.532 3.440 2.66%
1524 :     boyer 8.768 7.747 13.19% 493+199 301+289 0.327 0.297 10.11%
1525 :     count-graphs 2.040 2.010 1.49% 298+394 315+457 26.578 28.660 -7.26%
1526 :     fft 1.327 1.302 1.92% 112+209 115+210 1.055 0.962 9.71%
1527 :     knuthBendix 5.218 5.475 -4.69% 451+598 510+650 0.928 0.932 -0.36%
1528 :     lexgen 9.970 9.623 3.60% 1014+841 1157+885 0.947 0.928 1.97%
1529 :     life 1.183 1.183 0.00% 162+182 145+148 0.127 0.103 22.58%
1530 :     logic 3.285 3.512 -6.45% 514+684 591+836 5.682 5.577 1.88%
1531 :     mandelbrot 0.147 0.143 2.33% 38+41 33+54 0.703 0.690 1.93%
1532 :     mlyacc 35.457 32.763 8.22% 3496+4564 3611+4860 0.552 0.550 0.30%
1533 :     nucleic 7.100 6.888 3.07% 239+168 201+158 0.175 0.173 0.96%
1534 :     ratio-regions 6.388 6.843 -6.65% 1182+257 981+300 120.142 120.345 -0.17%
1535 :     ray 2.332 2.338 -0.29% 346+398 402+494 3.593 3.540 1.51%
1536 :     simple 9.912 9.903 0.08% 1475+941 1579+1168 3.057 3.178 -3.83%
1537 :     tsp 1.623 1.532 5.98% 266+200 250+211 8.045 7.878 2.12%
1538 :     vliw 33.947 35.470 -4.29% 2629+2774 2877+3171 2.072 1.890 9.61%
1539 :     ----------------------------------------------------------------------------
1540 :     Average 1.22% 3.36%
1541 :    
1542 :     ----------------------------------------------------------------------
1543 :     Name: Allen Leung
1544 : leunga 583 Date: 2000/03/23 16:25:00
1545 :     Tag: leunga-20000323-fix_x86_alpha
1546 :     Description:
1547 :    
1548 :     1. X86 fixes/changes
1549 :    
1550 :     a. The old code generated for SETcc was completely wrong.
1551 :     The Intel optimization guide is VERY misleading.
1552 :    
1553 :     2. ALPHA fixes/changes
1554 :    
1555 :     a. Added the instructions LDBU, LDWU, STB, STW as per Fermin's suggestion.
1556 :     b. Added a new mode byteWordLoadStores to the functor parameter to Alpha()
1557 :     c. Added reassociation code for address computation.
1558 :    
1559 :     ----------------------------------------------------------------------
1560 :     Name: Allen Leung
1561 : leunga 580 Date: 2000/03/22 01:23:00
1562 :     Tag: leunga-20000322-fix_x86_hppa_ra
1563 :     Description:
1564 :    
1565 :     1. X86 fixes/changes
1566 :    
1567 :     a. x86Rewrite bug with MUL3 (found by Lal)
1568 :     b. Added the instructions FSTS, FSTL
1569 :    
1570 :     2. PA-RISC fixes/changes
1571 :    
1572 :     a. B label should not be a delay slot candidate! Why did this work?
1573 :     b. ADDT(32, REG(32, r), LI n) now generates one instruction instead of two,
1574 :     as it should be.
1575 :     c. The assembly syntax for fstds and fstdd was wrong.
1576 :     d. Added the composite instruction COMICLR/LDO, which is the immediate
1577 :     operand variant of COMCLR/LDO.
1578 :    
1579 :     3. Generic MLRISC
1580 :    
1581 :     a. shuffle.sml rewritten to be slightly more efficient
1582 :     b. DIV bug in mltree-simplify fixed (found by Fermin)
1583 :    
1584 :     4. Register Allocator
1585 :    
1586 :     a. I now release the interference graph earlier during spilling.
1587 :     May improve memory usage.
1588 :    
1589 :     ----------------------------------------------------------------------
1590 : blume 577 Name: Matthias Blume
1591 : blume 578 Date: 2000/03/14 14:15:32
1592 :     Tag: blume_main_v110p26p1_2
1593 :     Description:
1594 :    
1595 :     1. Tools.registerStdShellCmdTool (from smlnj/cm/tool.cm) takes an
1596 :     additional argument called "template" which is an optional string that
1597 : monnier 659 specifies the layout of the tool command line. See the CM manual for
1598 : blume 578 explanation.
1599 :    
1600 : monnier 659 2. A special-purpose tool can be "registered" by simply dropping the
1601 : blume 578 corresponding <...>-tool.cm (and/or <...>-ext.cm) into the same
1602 :     directory where the .cm file lives that uses this tool. (The
1603 :     behavior/misfeature until now was to look for the tool description
1604 :     files in the current working directory.) As before, tool description
1605 :     files could also be anchored -- in which case they can live anywhere
1606 :     they like. Following the recent e-mail discussion, this change should
1607 :     make it easier to have special-purpose tools that are shipped together
1608 :     with the sources of the program that uses them.
1609 :    
1610 :     ----------------------------------------------------------------------
1611 :     Name: Matthias Blume
1612 : blume 577 Date: 2000/03/10 07:48:34
1613 :     Tag: blume_main_v110p26p1_1
1614 :     Description:
1615 :    
1616 :     I added a re-written version of Dave's fixpt script to src/system.
1617 :     Changes relative to the original version:
1618 :     - sh-ified (not everybody has ksh)
1619 :     - automatically figures out which architecture it runs on
1620 :     - uses ./makeml a bit more cleverly
1621 :     - never invokes ./installml (and, thus, does not clobber your
1622 :     good and working installation of sml in case something goes wrong)
1623 :     - accepts max iteration count using option "-iter <n>"
1624 :     - accepts a "base" name using option "-base <base>"
1625 :    
1626 :     It does not build any extraneous heap images but directly rebuilds
1627 :     bin- and boot-hierarchies using makeml's "-rebuild" switch. Finally,
1628 :     it can incorporate existing bin- and boot- hierarchies. For example,
1629 :     suppose the base is set to "sml" (which is the default). Then it
1630 :     successively builds
1631 :    
1632 :     sml.bin.<arch>-unix and sml.boot.<arch>-unix
1633 :     then sml1.bin.<arch>-unix and sml1.boot.<arch>-unix
1634 :     then sml2.bin.<arch>-unix and sml2.boot.<arch>-unix
1635 :     ...
1636 :     then sml<n>.bin.<arch>-unix and sml<n>.boot.<arch>-unix
1637 :    
1638 :     and so on. If any of these already exist, it will just use what's
1639 :     there. In particular, many people will have the initial set of bin
1640 :     and boot files around, so this saves time for at least one full
1641 :     rebuild. Having sets of the form <base><k>.{bin,boot}.<arch>-unix for
1642 :     <k>=1,2,... is normally not a good idea when invoking fixpt. However,
1643 :     they might be the result of an earlier partial run of fixpt (which
1644 : monnier 659 perhaps got accidentally killed). In this case, fixpt will quickly
1645 : blume 577 move through what exists before continuing where it left off earlier,
1646 :     and, thus, saves a lot of time.
1647 :    
1648 :     ----------------------------------------------------------------------
1649 : leunga 576 Name: Allen Leung
1650 :     Date: 00/03/10 02:20:00
1651 :     Tag: leunga-20000310-fix_x86_asm_ra
1652 :     Description:
1653 : dbm 570
1654 : leunga 576 More assembly output problems involving the indexed addressing mode
1655 :     on the x86 have been found and corrected. Thanks to Fermin Reig for the
1656 :     fix.
1657 :    
1658 :     The interface and implementation of the register allocator have been changed
1659 :     slightly to accommodate the possibility to skip the register allocation
1660 :     phases completely and go directly to memory allocation. This is needed
1661 :     for C-- use.
1662 :    
1663 : dbm 570 ----------------------------------------------------------------------
1664 : blume 572 Name: Matthias Blume
1665 : blume 575 Date: 00/03/09 10:23:53
1666 :     Tag: blume_main_v110p26p1_0
1667 :     Description:
1668 :    
1669 :     * Complete re-organization of library names. Many libraries have been
1670 :     consolidated so that they share the same path anchor. For example,
1671 :     all MLRISC-related libraries are anchored at MLRISC, most libraries that
1672 :     are SML/NJ-specific are under "smlnj". Notice that names like
1673 :     host-cmb.cm or host-compiler.cm no longer exist. See system/README
1674 :     for a complete description of the new naming scheme. Quick reference:
1675 :    
1676 :     host-cmb.cm -> smlnj/cmb.cm
1677 :     host-compiler.cm -> smlnj/compiler.cm
1678 :     full-cm.cm -> smlnj/cm.cm
1679 :     <arch>-<os>.cm -> smlnj/cmb/<arch>-<os>.cm
1680 :     <arch>-compiler.cm -> smlnj/compiler/<arch>.cm
1681 :    
1682 :     * Bug fixes in CM.
1683 :     - exceptions in user code are being passed through (i.e., reach top level)
1684 :     - more bugs in paranoia mode fixed
1685 :     - bug related to checking group owners fixed
1686 :    
1687 :     * New install.sh script that automagically fetches archive files:
1688 :     The new file config/srcarchiveurl must contain the URL of the
1689 :     (remote) directory that contains bin files (or other source archives).
1690 :     If install.sh does not find the archive locally, it tries to get
1691 :     it from that remote directory.
1692 :     This should simplify installation further: For machines that have
1693 :     access to the internet, just fetch <version>-config.tgz, unpack it,
1694 : monnier 659 edit config/targets, and go (run config/install.sh). The script will
1695 : blume 575 fetch everything else that it might need all by itself.
1696 :    
1697 :     For CVS users, this mechanism is not relevant for source archives, but
1698 :     it is convenient for getting new sets of binfiles.
1699 :    
1700 :     Archives should be tar files compressed with either gzip, compress, or
1701 :     bzip2. The script recognizes .tgz, .tar, tar.gz, tz, .tar.Z, and .tar.bz2.
1702 :    
1703 :     ----------------------------------------------------------------------
1704 :     Name: Matthias Blume
1705 : blume 572 Date: 2000/03/07 04:01:04
1706 :     Tag: blume_main_v110_26_2
1707 : dbm 570 Description:
1708 : blume 572 - size info in BOOTLIST
1709 :     * no fixed upper limits for number of bootfiles or length of
1710 :     bootfile names in runtime
1711 :     * falling back to old behavior if no BOOTLIST size info found
1712 :     - allocation size heuristics in .run-sml
1713 :     * tries to read cache size from /proc/cpuinfo (this is important for
1714 :     small-cache Celeron systems!)
1715 :     - install.sh robustified
1716 :     - CM manual updates
1717 :     - paranoid mode
1718 :     * no more CMB.deliver() (i.e., all done by CMB.make())
1719 :     * can re-use existing sml.boot.* files
1720 :     * init.cmi now treated as library
1721 :     * library stamps for consistency checks
1722 :     - sml.boot.<arch>-<os>/PIDMAP file
1723 :     * This file is read by the CM startup code. This is used to minimize
1724 :     the amount of dynamic state that needs to be stowed away for the
1725 :     purpose of sharing between interactive system and user code.
1726 :     - CM.Anchor.anchor instead of CM.Anchor.{set,cancel}
1727 :     * Upon request by Elsa. Anchors now controlled by get-set-pair
1728 :     like most other CM state variables.
1729 :     - Compiler.CMSA eliminated
1730 :     * No longer supported by CM anyway.
1731 :     - fixed bugs in pickler that kept biting Stefan
1732 :     * past refs to past refs (was caused by the possibility that
1733 :     ad-hoc sharing is more discriminating than hash-cons sharing)
1734 :     * integer overflow on LargeInt.minInt
1735 :     - ml-{lex,yacc} build scripts now use new mechanism
1736 :     for building standalone programs
1737 :     - fixed several gcc -Wall warnings that were caused by missing header
1738 :     files, missing initializations, etc., in runtime (not all warnings
1739 :     eliminated, though)

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