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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 : george 1003 Date: yyyy/mm/dd
12 : dbm 570 Tag: <post-commit CVS tag>
13 :     Description:
14 : leunga 1142
15 : george 1136 ----------------------------------------------------------------------
16 : leunga 1296 Name: Allen Leung
17 :     Date: 2003/01/07 10:40:00 EST
18 :     Tag: leunga-20030107-int-rem
19 :     Description:
20 :    
21 :     Fixed a bug in Int.rem(x,y) where y is a power of 2 on x86.
22 :     The arguments to the SUBL instruction were swapped.
23 :    
24 :     ----------------------------------------------------------------------
25 : blume 1229 Name: Matthias Blume
26 : blume 1294 Date: 2002/12/12 16:25:00 EST
27 :     Tag: blume-20021212-risc-ra
28 :     Description:
29 :    
30 :     Fixed a serious bug in the rewrite code for FP spilling/reloading that
31 :     sent the RA into an infinite loop when floating point registers get
32 :     spilled. (Because of this bug, e.g., nucleic stopped compiling between
33 :     110.37 and 110.38.)
34 :     There was another set of potential problems related to the handling of
35 :     MLRISC annotations (but those did not yet cause real problems, apparently).
36 :    
37 :     ----------------------------------------------------------------------
38 :     Name: Matthias Blume
39 : blume 1291 Date: 2002/12/06 22:40:00 EST
40 :     Tag: blume-20021206-cm-fileid
41 :     Description:
42 :    
43 :     Added a call of SrcPath.sync at the beginning of Parse.parse (in CM).
44 :     This fixes the problem of CM getting confused by files that suddenly
45 :     change their identity (e.g., by getting unlinked and recreated by some
46 :     text editor such as vi). There might be a better/cheaper/cleaner way
47 :     of doing this, but for now this will have to do.
48 :    
49 :     ----------------------------------------------------------------------
50 :     Name: Matthias Blume
51 : blume 1288 Date: 2002/10/28 09:50:00 EST
52 :     Tag: blume-20021028-typecheck
53 :     Description:
54 :    
55 :     Exported structure Typecheck from $smlnj/viscomp/core.cm.
56 :    
57 :     ----------------------------------------------------------------------
58 :     Name: Matthias Blume
59 : blume 1282 Date: 2002/10/17 09:10:00 EDT
60 : blume 1279 Tag: Release_110_42
61 :     Description:
62 :    
63 : blume 1282 In good old tradition, there has been a slight hiccup so that we have
64 :     to patch 110.42 after the fact. The old release tag has been replaced
65 :     (see below).
66 :    
67 :     The change solves a problem with two competing approaches the
68 :     configuration problem regarding MacOS 10.1 vs. MacOS 10.2 which got in
69 :     each other's way.
70 :    
71 :     This change only affects the runtime system code and the installer script.
72 :     (No new bootfiles.)
73 :    
74 :     ----------------------------------------------------------------------
75 :     Name: Matthias Blume
76 :     Date: 2002/10/16 12:00:00 EDT
77 :     Tag: Release_110_42_removed
78 :     Description:
79 :    
80 : blume 1279 New working release. New bootfiles.
81 :    
82 :     ----------------------------------------------------------------------
83 :     Name: Matthias Blume
84 : blume 1273 Date: 2002/10/10 13:10:00 EDT
85 :     Tag: blume-20021010-ppc-divs
86 :     Description:
87 :    
88 :     The mltree operator DIVS must be implemented with an overflow check on
89 :     the PPC because the hardware indicates divide-by-zero using "overflow" as
90 :     well.
91 :    
92 :     ----------------------------------------------------------------------
93 :     Name: Matthias Blume
94 : blume 1261 Date: 2002/07/23 11:45:00
95 :     Tag: blume-20020723-smlnj-home
96 :     Description:
97 :    
98 :     Sml now senses the SMLNJ_HOME environment variable. If this is set,
99 :     then the bin dir is assumed to be in $SMLNJ_HOME/bin and (unless
100 :     CM_PATHCONFIG is also set), the path configuration file is assumed
101 :     to be in $SMLNJ_HOME/lib/pathconfig. This way one can easily move
102 :     the entire tree to some other place and everything will "just work".
103 :    
104 :     (Companion commands such as ml-build and ml-makedepend also sense this
105 :     variable.)
106 :    
107 :     ----------------------------------------------------------------------
108 :     Name: Matthias Blume
109 : blume 1259 Date: 2002/07/12 21:19:00 EDT
110 :     Tag: blume-20020712-liveness
111 :     Description:
112 :    
113 :     Exported two useful "step" functions from liveness module (MLRISC).
114 :    
115 :     ----------------------------------------------------------------------
116 :     Name: Matthias Blume
117 : blume 1253 Date: 2002/07/05 16:00 EDT
118 :     Tag: Release_110_41
119 :     Description:
120 :    
121 :     New working release. New bootfiles.
122 :    
123 :     ----------------------------------------------------------------------
124 :     Name: Matthias Blume
125 : blume 1250 Date: 2002/07/05 10:25:00 EDT
126 :     Tag: blume-20020705-btimp
127 :     Description:
128 :    
129 :     Exported structure BTImp from $smlnj/viscomp/debugprof.cm so that
130 :     other clients can set up backtracing support.
131 :    
132 :     ----------------------------------------------------------------------
133 :     Name: Matthias Blume
134 : blume 1249 Date: 2002/06/25 17:23:00 EDT
135 :     Tag: blume-20020625-fpmax
136 :     Description:
137 :    
138 :     Fixed a bug in translation of INLMAX (and INLMIN) for the floating-point
139 :     case. (The sense of the isNaN test was reversed -- which made min and
140 :     max always return their first argument.)
141 :    
142 :     ----------------------------------------------------------------------
143 :     Name: Matthias Blume
144 : blume 1240 Date: 2002/06/11
145 :     Tag: blume-20020611-unixpath
146 :     Description:
147 :    
148 :     Back-ported OS.Path.{from,to}UnixPath from idlbasis-devel branch.
149 :    
150 :     ----------------------------------------------------------------------
151 :     Name: Matthias Blume
152 : blume 1238 Date: 2002/06/10 16:35:00 EDT
153 :     Tag: blume-20020610-ieeereal
154 :     Description:
155 :    
156 :     I back-ported my implementation of IEEEReal.fromString from the
157 :     idlbasis-devel branch so that we can test it.
158 :    
159 :     Another small change is that ppDec tries to give more information
160 :     than just "<sig>" in the case of functors. However, this code is
161 :     broken in some mysterious way if the functor's body's signature
162 :     has not been declared by ascription but gets inferred from the
163 :     implementation. This needs fixing...
164 :    
165 :     ----------------------------------------------------------------------
166 :     Name: Matthias Blume
167 : blume 1229 Date: 2002/05/31
168 :     Tag: blume-20020531-btrace-mode
169 :     Description:
170 :    
171 :     Resurrected SMLofNJ.Internals.BTrace.mode. (It accidentally fell by
172 :     the wayside when I switched over to using Controls everywhere.)
173 :    
174 :     ----------------------------------------------------------------------
175 : george 1222 Name: Lal George
176 :     Date: 2002/05/23 12:21:40 EDT
177 :     Tag: george-20020523-visual-labels
178 :     Description:
179 :    
180 :     Labels are now displayed in the graphical output to make
181 :     the fall-through and target blocks obvious.
182 :    
183 :     ----------------------------------------------------------------------
184 : blume 1204 Name: Matthias Blume
185 : blume 1220 Date: 2002/05/22 11:03:00 EDT
186 :     Tag: blume-20020522-shrink
187 :     Description:
188 :    
189 :     John tweaked yesterday's fix for 1131 to handle an out-of-memory
190 :     situation that comes up when allocating huge arrays.
191 :    
192 :     ----------------------------------------------------------------------
193 :     Name: Matthias Blume
194 : blume 1215 Date: 2002/05/21 16:00:00 EDT
195 :     Tag: Release_110_40
196 :     Description:
197 :    
198 :     New working release (110.40). New bootfiles.
199 :    
200 :     [Also: John Reppy fixed GC bug 1131.]
201 :    
202 :     ----------------------------------------------------------------------
203 :     Name: Matthias Blume
204 : blume 1212 Date: 2002/05/21 12:35:00 EDT
205 :     Tag: blume-20020521-cmdoc
206 :     Description:
207 :    
208 :     CM documentation update.
209 :    
210 :     ----------------------------------------------------------------------
211 :     Name: Matthias Blume
212 : blume 1211 Date: 2002/05/21 10:55:00 EDT
213 :     Tag: blume-20020521-misc
214 :     Description:
215 :    
216 :     - John tweaked runtime to be silent on heap export (except when
217 :     GC messages are on).
218 :     - I added a few more things (cross-compiling versions of CMB) to
219 :     config/preloads (as suggestions).
220 :    
221 :     ----------------------------------------------------------------------
222 :     Name: Matthias Blume
223 : blume 1208 Date: 2002/05/20 22:25:00 EDT
224 :     Tag: blume-20020520-controls
225 :     Description:
226 :    
227 :     - Added ControlUtil structure to control-lib.cm.
228 :     - Use it throughout.
229 :     - Used Controls facility to define MLRISC controls (as opposed to
230 :     registering MLRISC control ref cells with Controls after the fact)
231 :     - Fixed messed-up controls priorities.
232 :    
233 :     * Removed again all the stuff from config/preloads that one wouldn't
234 :     be able to preload at the time the initial heap image is built.
235 :     (Many libraries, e.g., CML, do not exist yet at this time. The
236 :     only libraries that can be preloaded via config/preloads are those
237 :     that come bundled with the bootfiles.)
238 :    
239 :     ----------------------------------------------------------------------
240 :     Name: Matthias Blume
241 : blume 1204 Date: 2002/05/20 10:59:00 EDT
242 :     Tag: blume-20020520-preloads
243 :     Description:
244 :    
245 :     Added a lot of commented-out suggestions for things to be included
246 :     in config/preloads.
247 :    
248 :     ----------------------------------------------------------------------
249 : leunga 1203 Name: Allen Leung
250 :     Date: 2002/05/18 14:20:00 EDT
251 :     Tag: leunga-20020518-mdl
252 :     Description:
253 :    
254 :     o Made the mdl tool stuff compile and run again.
255 :     o I've disabled all the stuff that depends on RTL specifications; they
256 :     are all badly broken anyway.
257 :    
258 :     ----------------------------------------------------------------------
259 : blume 1201 Name: Matthias Blume
260 :     Date: 2002/05/17 16:49:00 EDT
261 :     Tag: blume-20020517-controls
262 :     Description:
263 :    
264 :     0. John Reppy made several modifications to the SML/NJ library.
265 :     In particular, there is a shiny new controls-lib.cm.
266 :    
267 :     1. Pushed new controls interface through compiler so that everything
268 :     compiles again.
269 :    
270 :     2. Added FormatComb and FORMAT_COMB to the CML version of the
271 :     SML/NJ library (so that CML compiles again).
272 :    
273 :     3. Modified init scripts because XXX_DEFAULT environment variables
274 :     are no longer with us. (Boot-time initialization is now done
275 :     using the same environment variables that are also used for
276 :     startup-time initialization of controls.)
277 :    
278 :     ----------------------------------------------------------------------
279 : george 1192 Name: Lal George
280 :     Date: 2002/05/15 09:20:10 EDT
281 :     Tag: george-20020515-pseudo-op-decls
282 :     Description:
283 :    
284 :     All pseudo-ops emitted before the first segment declaration
285 :     such as TEXT, DATA, and BSS directives are assumed to be global
286 :     declarations and are emitted first in the assembly file. This is
287 :     useful in a number of situations where one has pseudo-ops that are not
288 :     specific to any segment, and also works around the constraint that one
289 :     cannot have client pseudo-ops in the TEXT segment.
290 :    
291 :     Because no segment is associated with these declarations it is
292 :     an error to allocate any space or objects before the first segment
293 :     directive and an exception will be raised. However, we cannot make
294 :     this check for client pseudo-ops.
295 :    
296 :     These top level declarations are a field in the CFG graph_info.
297 :     In theory you can continue to add to this field after the CFG has been
298 :     built -- provided you know what you are doing;-)
299 :    
300 :     ----------------------------------------------------------------------
301 : blume 1175 Name: Matthias Blume
302 : blume 1190 Date: 2002/05/13 16:40:00 EDT
303 :     Tag: blume-20020513-pp-etc
304 :     Description:
305 :    
306 :     A few minor bugfixes:
307 :    
308 :     - Stopgap measure for bug recently reported by Elsa Gunter (ppDec).
309 :     (Bogus printouts for redefined bindings still occur. Compiler
310 :     bug should no longer occur now. We need to redo the prettyprinter
311 :     from scratch.)
312 :    
313 :     - CM pathname printer now also adds escape sequences for ( and )
314 :    
315 :     - commend and docu fixes for ml-nlffi
316 :    
317 :     ----------------------------------------------------------------------
318 :     Name: Matthias Blume
319 : blume 1189 Date: 2002/05/10 16:40:00 EDT
320 :     Tag: blume-20020510-erg-textio
321 :     Description:
322 :    
323 :     Applied the following bugfix provided by Emden Gansner:
324 :    
325 :     Output is corrupted when outputSubstr is used rather than output.
326 :    
327 :     The problem occurs when a substring
328 :    
329 :     ss = (s, dataStart, dataLen)
330 :    
331 :     where dataStart > 0, fills a stream buffer with avail bytes left.
332 :     avail bytes of s, starting at index dataStart, are copied into the
333 :     buffer, the buffer is flushed, and then the remaining dataLen-avail
334 :     bytes of ss are copied into the beginning of the buffer. Instead of
335 :     starting this copy at index dataStart+avail in s, the current code
336 :     starts the copy at index avail.
337 :    
338 :     Fix:
339 :     In text-io-fn.sml, change line 695 from
340 :     val needsFlush = copyVec(v, avail, dataLen-avail, buf, 0)
341 :     to
342 :     val needsFlush = copyVec(v, dataStart+avail, dataLen-avail, buf, 0)
343 :    
344 :     ----------------------------------------------------------------------
345 :     Name: Matthias Blume
346 : blume 1186 Date: 2002/04/12 13:55:00 EDT
347 :     Tag: blume-20020412-assyntax
348 :     Description:
349 :    
350 :     1. Grabbed newer assyntax.h from the XFree86 project.
351 :     2. Fiddled with how to compile X86.prim.asm without warnings.
352 :     3. (Very) Minor cleanup in CM.
353 :    
354 :     ----------------------------------------------------------------------
355 :     Name: Matthias Blume
356 : blume 1185 Date: 2002/04/01 (no joke!) 17:07:00 EST
357 :     Tag: blume-20020401-x86div
358 :     Description:
359 :    
360 :     Added full support for div/mod/rem/quot on the x86, using the machine
361 :     instruction's two results (without clumsily recomputing the remainder)
362 :     directly where appropriate.
363 :    
364 :     Some more extensive power-of-two support was added to the x86 instruction
365 :     selector (avoiding expensive divs, mods, and muls where they can be
366 :     replaced with cheaper shifts and masks). However, this sort of thing
367 :     ought to be done earlier, e.g., within the CPS optimizer so that
368 :     all architectures benefit from it.
369 :    
370 :     The compiler compiles to a fixed point, but changes might be somewhat
371 :     fragile nevertheless. Please, report any strange things that you might
372 :     see wrt. div/mod/quot/rem...
373 :    
374 :     ----------------------------------------------------------------------
375 :     Name: Matthias Blume
376 : blume 1184 Date: 2002/03/29 17:22:00
377 :     Tag: blume-20020329-div
378 :     Description:
379 :    
380 :     Fixed my broken div/mod logic. Unfortunately, this means that the
381 :     inline code for div/mod now has one more comparison than before.
382 :     Fast paths (quotient > 0 or remainder = 0) are not affected, though.
383 :     The problem was with quotient = 0, because that alone does not tell
384 :     us which way the rounding went. One then has to look at whether
385 :     remainder and divisor have the same sign... :(
386 :    
387 :     Anyway, I replaced the bootfiles with fresh ones...
388 :    
389 :     ----------------------------------------------------------------------
390 :     Name: Matthias Blume
391 : blume 1183 Date: 2002/03/29 14:10:00 EST
392 :     Tag: blume-20020329-inlprims
393 :     Description:
394 :    
395 :     NEW BOOTFILES!!! Version number bumped to 110.39.3.
396 :    
397 :     Primops have changed. This means that the bin/boot-file formats have
398 :     changed as well.
399 :    
400 :     To make sure that there is no confusion, I made a new version.
401 :    
402 :    
403 :     CHANGES:
404 :    
405 :     * removed REMT from mltree (remainder should never overflow).
406 :    
407 :     * added primops to deal with divisions of all flavors to the frontend
408 :    
409 :     * handled these primops all the way through so they map to their respective
410 :     MLRISC support
411 :    
412 :     * used these primops in the implementation of Int, Int32, Word, Word32
413 :    
414 :     * removed INLDIV, INLMOD, and INLREM as they are no longer necessary
415 :    
416 :     * parameterized INLMIN, INLMAX, and INLABS by a numkind
417 :    
418 :     * translate.sml now deals with all flavors of INL{MIN,MAX,ABS}, including
419 :     floating point
420 :    
421 :     * used INL{MIN,MAX,ABS} in the implementation of Int, Int32, Word, Word32,
422 :     and Real (but Real.abs maps to a separate floating-point-only primop)
423 :    
424 :    
425 :     TODO items:
426 :    
427 :     * Hacked Alpha32 instruction selection, disabling the selection of REMx
428 :     instructions because the machine instruction encoder cannot handle
429 :     them. (Hppa, PPC, and Sparc instruction selection did not handle
430 :     REM in the first place, and REM is supported by the x86 machine coder.)
431 :    
432 :     * Handle DIV and MOD with DIV_TO_NEGINF directly in the x86 instruction
433 :     selection phase. (The two can be streamlined because the hardware
434 :     delivers both quotient and remainder at the same time anyway.)
435 :    
436 :     * Think about what to do with "valOf(Int32.minInt) div ~1" and friends.
437 :     (Currently the behavior is inconsistent both across architectures and
438 :     wrt. the draft Basis spec.)
439 :    
440 :     * Word8 should eventually be handled natively, too.
441 :    
442 :     * There seems to be one serious bug in mltree-gen.sml. It appears, though,
443 :     as if there currently is no execution path that could trigger it in
444 :     SML/NJ. (The assumptions underlying functions arith and promotable do not
445 :     hold for things like multiplication and division.)
446 :    
447 :     ----------------------------------------------------------------------
448 :     Name: Matthias Blume
449 : blume 1181 Date: 2002/03/27 16:27:00 EST
450 :     Tag: blume-20020327-mlrisc-divisions
451 :     Description:
452 :    
453 :     Added support for all four division operations (ML's div, mod, quot,
454 :     and rem) to MLRISC. In the course of doing so, I also rationalized
455 :     the naming (no more annoying switch-around of DIV and QUOT), by
456 :     parameterizing the operation by div_rounding_mode (which can be either
457 :     DIV_TO_ZERO or DIV_TO_NEGINF).
458 :    
459 :     The generic MLTreeGen functor takes care of compiling all four
460 :     operations down to only round-to-zero div.
461 :    
462 :     Missing pieces:
463 :    
464 :     * Doing something smarter than relying on MLTreeGen on architectures
465 :     like, e.g., the x86 where hardware division delivers both quotient and
466 :     remainder at the same time. With this, the implementation of the
467 :     round-to-neginf operations could be further streamlined.
468 :    
469 :     * Remove inlining support for div/mod/rem from the frontend and replace it
470 :     with primops that get carried through to the backend. Do this for all
471 :     int and word types.
472 :    
473 :     ----------------------------------------------------------------------
474 :     Name: Matthias Blume
475 : blume 1180 Date: 2002/03/25 17:25:00 EST
476 :     Tag: blume-20020325-divmod
477 :     Description:
478 :    
479 :     I improved (hopefully without breaking them) the implementation of Int.div,
480 :     Int.mod, and Int.rem. For this, the code in translate.sml now takes
481 :     advantage of the following observations:
482 :    
483 :     Let q = x quot y r = x rem y
484 :     d = x div y m = x mod y
485 :    
486 :     where "quot" is the round-to-zero version of integer division that
487 :     hardware usually provides. Then we have:
488 :    
489 :     r = x - q * y where neither the * nor the - will overflow
490 :     d = if q >= 0 orelse x = q * y then q else q - 1
491 :     where neither the * nor the - will overflow
492 :     m = if q >= 0 orelse r = 0 then r else r + y
493 :     where the + will not overflow
494 :    
495 :     This results in substantial simplification of the generated code.
496 :     The following table shows the number of CFG nodes and edges generated
497 :     for
498 :     fun f (x, y) = x OPER y
499 :     (* with OPER \in div, mod, quot, rem *)
500 :    
501 :    
502 :     OPER | nodes(old) | edges(old) | nodes(new) | edges(new)
503 :     --------------------------------------------------------
504 :     div | 24 | 39 | 12 | 16
505 :     mod | 41 | 71 | 12 | 16
506 :     quot | 8 | 10 | 8 | 10
507 :     rem | 10 | 14 | 8 | 10
508 :    
509 :    
510 :     ----------------------------------------------------------------------
511 :     Name: Matthias Blume
512 : blume 1179 Date: 2002/03/25 22:06:00 EST
513 :     Tag: blume-20020325-cprotobug
514 :     Description:
515 :    
516 :     Fixed a bug in cproto (c prototype decoder).
517 :    
518 :     ----------------------------------------------------------------------
519 :     Name: Matthias Blume
520 : blume 1178 Date: 2002/03/25 16:00:00 EST
521 :     Tag: blume-20020325-raw-primops
522 :     Description:
523 :    
524 :     I did some cleanup to Allen's new primop code and
525 :     replaced yesterday's bootfiles with new ones.
526 :     (But they are stored in the same place.)
527 :    
528 :     ----------------------------------------------------------------------
529 :     Name: Matthias Blume
530 : blume 1175 Date: 2002/03/24 22:40:00 EST
531 :     Tag: blume-20020324-bootfiles
532 :     Description:
533 :    
534 :     Made the bootfiles that Allen asked for.
535 :    
536 :     ----------------------------------------------------------------------
537 : leunga 1174 Name: Allen Leung
538 :     Date: 2002/03/23 15:50:00 EST
539 :     Tag: leunga-20020323-flint-cps-rcc-primops
540 :     Description:
541 :    
542 :     1. Changes to FLINT primops:
543 :    
544 :     (* make a call to a C-function;
545 :     * The primop carries C function prototype information and specifies
546 :     * which of its (ML-) arguments are floating point. C prototype
547 :     * information is for use by the backend, ML information is for
548 :     * use by the CPS converter. *)
549 :     | RAW_CCALL of { c_proto: CTypes.c_proto,
550 :     ml_args: ccall_type list,
551 :     ml_res_opt: ccall_type option,
552 :     reentrant : bool
553 :     } option
554 :     (* Allocate uninitialized storage on the heap.
555 :     * The record is meant to hold short-lived C objects, i.e., they
556 :     * are not ML pointers. With the tag, the representation is
557 :     * the same as RECORD with tag tag_raw32 (sz=4), or tag_fblock (sz=8)
558 :     *)
559 :     | RAW_RECORD of {tag:bool,sz:int}
560 :     and ccall_type = CCALL_INT32 | CCALL_REAL64 | CCALL_ML_PTR
561 :    
562 :     2. These CPS primops are now overloaded:
563 :    
564 :     rawload of {kind:numkind}
565 :     rawstore of {kind:numkind}
566 :    
567 :     The one argument form is:
568 :    
569 :     rawload {kind} address
570 :    
571 :     The two argument form is:
572 :    
573 :     rawload {kind} [ml object, byte-offset]
574 :    
575 :     3. RAW_CCALL/RCC now takes two extra arguments:
576 :    
577 :     a. The first is whether the C call is reentrant, i.e., whether
578 :     ML state should be saved and restored.
579 :     b. The second argument is a string argument specifying the name of
580 :     library and the C function.
581 :    
582 :     These things are currently not handled in the code generator, yet.
583 :    
584 :     4. In CProto,
585 :    
586 :     An encoding type of "bool" means "ml object" and is mapped into
587 :     C prototype of PTR. Note that "bool" is different than "string",
588 :     even though "string" is also mapped into PTR, because "bool"
589 :     is assigned an CPS type of BOGt, while "string" is assigned INT32t.
590 :    
591 :     5. Pickler/unpicker
592 :    
593 :     Changed to handle RAW_RECORD and newest RAW_CCALL
594 :    
595 :     6. MLRiscGen,
596 :    
597 :     1. Changed to handle the new rawload/rawstore/rawrecord operators.
598 :     2. Code for handling C Calls has been moved to a new module CPSCCalls,
599 :     in the file CodeGen/cpscompile/cps-c-calls.sml
600 :    
601 :     7. Added the conditional move operator
602 :    
603 :     condmove of branch
604 :    
605 :     to cps. Generation of this is still buggy so it is currently
606 :     disabled.
607 :    
608 :     ----------------------------------------------------------------------
609 : george 1168 Name: Lal George
610 :     Date: 2002/03/22 14:18:25 EST
611 : george 1171 Tag: george-20020322-cps-branch-prob
612 : george 1168 Description:
613 :    
614 : george 1171 Implemented the Ball-Larus branch prediction-heuristics, and
615 : george 1168 incorporated graphical viewers for control flow graphs.
616 :    
617 : george 1171 Ball-Larus Heuristics:
618 : george 1168 ---------------------
619 :     See the file compiler/CodeGen/cpscompile/cpsBranchProb.sml.
620 :    
621 :     By design it uses the Dempster-Shafer theory for combining
622 :     probabilities. For example, in the function:
623 :    
624 :     fun f(n,acc) = if n = 0 then acc else f(n-1, n*acc)
625 :    
626 :     the ball-larus heuristics predicts that the n=0 is unlikely
627 :     (OH-heuristic), and the 'then' branch is unlikely because of the
628 :     RH-heuristic -- giving the 'then' branch an even lower combined
629 : george 1171 probability using the Dempster-Shafer theory.
630 : george 1168
631 :     Finally, John Reppy's loop analysis in MLRISC, further lowers the
632 :     probability of the 'then' branch because of the loop in the else
633 :     branch.
634 :    
635 :    
636 :     Graphical Viewing:
637 :     ------------------
638 :     I merely plugged in Allen's graphical viewers into the compiler. The
639 :     additional code is not much. At the top level, saying:
640 :    
641 :     Control.MLRISC.getFlag "cfg-graphical-view" := true;
642 :    
643 :     will display the graphical view of the control flow graph just before
644 :     back-patching. daVinci must be in your path for this to work. If
645 :     daVinci is not available, then the default viewer can be changed
646 :     using:
647 :    
648 :     Control.MLRISC.getString "viewer"
649 :    
650 :     which can be set to "dot" or "vcg" for the corresponding viewers. Of
651 :     course, these viewers must be in your path.
652 :    
653 :     The above will display the compilation unit at the level of clusters,
654 :     many of which are small, boring, and un-interesting. Also setting:
655 :    
656 :     Control.MLRISC.getInt "cfg-graphical-view_size"
657 :    
658 :     will display clusters that are larger than the value set by the above.
659 :    
660 :    
661 :     ----------------------------------------------------------------------
662 : blume 1159 Name: Matthias Blume
663 :     Date: 2002/03/21 22:20:00 EST
664 :     Tag: blume-20020321-kmp-bugfix
665 :     Description:
666 :    
667 :     Changed the interface to the KMP routine in PreString and fixed
668 :     a minor bug in one place where it was used.
669 :    
670 :     ----------------------------------------------------------------------
671 : leunga 1156 Name: Allen Leung
672 : leunga 1158 Date: 2002/03/21 20:30:00 EST
673 :     Tag: leunga-20020321-cfg
674 :     Description:
675 :    
676 :     Fixed a potential problem in cfg edge splitting.
677 :    
678 :     ----------------------------------------------------------------------
679 :     Name: Allen Leung
680 : leunga 1156 Date: 2002/03/21 17:15:00 EST
681 :     Tag: leunga-20020321-x86-fp-cfg
682 :     Description:
683 :    
684 :     1. Recoded the buggy parts of x86-fp.
685 :    
686 :     a. All the block reordering code has been removed.
687 :     We now depend on the block placement phases to do this work.
688 :    
689 :     b. Critical edge splitting code has been simplified and moved into the
690 :     CFG modules, as where they belong.
691 :    
692 :     Both of these were quite buggy and complex. The code is now much, much
693 :     simpler.
694 :    
695 :     2. X86 backend.
696 :    
697 :     a. Added instructions for 64-bit support. Instruction selection for
698 :     64-bit has not been committed, however, since that
699 :     requires changes to MLTREE which haven't been approved by
700 :     Lal and John.
701 :    
702 :     b. Added support for FUCOMI and FUCOMIP when generating code for
703 :     PentiumPro and above. We only generate these instructions in
704 :     the fast-fp mode.
705 :    
706 :     c. Added cases for JP and JNP in X86FreqProps.
707 :    
708 :     3. CFG
709 :    
710 :     CFG now has a bunch of methods for edge splitting and merging.
711 :    
712 :     4. Machine description.
713 :    
714 :     John's simplification of MLTREE_BASIS.fcond broke a few machine
715 :     description things:
716 :    
717 :     rtl-build.{sig,sml} and hppa.mdl fixed.
718 :    
719 :     NOTE: the machine description stuff in the repository is still broken.
720 :     Again, I can't put my fixes in because that involves
721 :     changes to MLTREE.
722 :    
723 :     ----------------------------------------------------------------------
724 : blume 1145 Name: Matthias Blume
725 : blume 1155 Date: 2002/03/20 15:55:00 EST
726 :     Tag: blume-20020320-kmp
727 :     Description:
728 :    
729 :     Implemented Knuth-Morris-Pratt string matching in PreString and used
730 :     it for String.isSubstring, Substring.isSubstring, and
731 :     Substring.position.
732 :    
733 :     (Might need some stress-testing. Simple examples worked fine.)
734 :    
735 :     ----------------------------------------------------------------------
736 :     Name: Matthias Blume
737 : blume 1152 Date: 2002/03/19 16:37:00 EST
738 :     Tag: blume-20020319-witnesses
739 :     Description:
740 :    
741 :     Added a structure C.W and functions convert/Ptr.convert to ml-nlffi-lib.
742 :    
743 :     This implements a generic mechanism for changing constness qualifiers
744 :     anywhere within big C types without resorting to outright "casts".
745 :     (So far, functions such as C.rw/C.ro or C.Ptr.rw/C.Ptr.ro only let you
746 :     modify the constness at the outermost level.)
747 :     The implementation of "convert" is based on the idea of "witness"
748 :     values -- values that are not used by the operation but whose types
749 :     "testify" to their applicability. On the implementation side, "convert"
750 :     is simply a projection (returning its second curried argument). With
751 :     cross-module inlining, it should not result in any machine code being
752 :     generated.
753 :    
754 :     ----------------------------------------------------------------------
755 :     Name: Matthias Blume
756 : blume 1148 Date: 2002/03/15 16:40:00 EST
757 :     Tag: blume-20020315-basis
758 :     Description:
759 :    
760 :     Provided (preliminary?) implementations for
761 :    
762 :     {String,Substring}.{concatWith,isSuffix,isSubstring}
763 :    
764 :     and
765 :    
766 :     Substring.full
767 :    
768 :     Those are in the Basis spec but they were missing in SML/NJ.
769 :    
770 :     ----------------------------------------------------------------------
771 :     Name: Matthias Blume
772 : blume 1145 Date: 2002/03/14 21:30:00 EST
773 :     Tag: blume-20020314-controls
774 :     Description:
775 :    
776 :     Controls:
777 :     ---------
778 :    
779 :     1. Factored out the recently-added Controls : CONTROLS stuff and put
780 :     it into its own library $/controls-lib.cm. The source tree for
781 :     this is under src/smlnj-lib/Controls.
782 :    
783 :     2. Changed the names of types and functions in this interface, so they
784 :     make a bit more "sense":
785 :    
786 :     module -> registry
787 :     'a registry -> 'a group
788 :    
789 :     3. The interface now deals in ref cells only. The getter/setter interface
790 :     is (mostly) gone.
791 :    
792 :     4. Added a function that lets one register an already-existing ref cell.
793 :    
794 :     5. Made the corresponding modifications to the rest of the code so that
795 :     everything compiles again.
796 :    
797 :     6. Changed the implementation of Controls.MLRISC back to something closer
798 :     to the original. In particular, this module (and therefore MLRISC)
799 :     does not depend on Controls. There now is some link-time code in
800 :     int-sys.sml that registers the MLRISC controls with the Controls
801 :     module.
802 :    
803 :     CM:
804 :     ---
805 :    
806 :     * One can now specify the lambda-split aggressiveness in init.cmi.
807 :    
808 :     ----------------------------------------------------------------------
809 : leunga 1142 Name: Allen Leung
810 :     Date: 2002/03/13 17:30:00 EST
811 :     Tag: leunga-20020313-x86-fp-unary
812 :     Description:
813 :    
814 :     Bug fix for:
815 :    
816 :     > leunga@weaselbane:~/Yale/tmp/sml-dist{21} bin/sml
817 :     > Standard ML of New Jersey v110.39.1 [FLINT v1.5], March 08, 2002
818 :     > - fun f(x,(y,z)) = Real.~ y;
819 :     > [autoloading]
820 :     > [autoloading done]
821 :     > fchsl (%eax), 184(%esp)
822 :     > Error: MLRisc bug: X86MCEmitter.emitInstr
823 :     >
824 :     > uncaught exception Error
825 :     > raised at: ../MLRISC/control/mlriscErrormsg.sml:16.14-16.19
826 :    
827 :     The problem was that the code generator did not generate any fp registers
828 :     in this case, and the ra didn't know that it needed to run the X86FP phase to
829 :     translate the pseudo fp instruction. This only happened with unary fp
830 :     operators in certain situations.
831 :    
832 :     ----------------------------------------------------------------------
833 : blume 1137 Name: Matthias Blume
834 : blume 1140 Date: 2002/03/13 14:00:00 EST
835 :     Tag: blume-20020313-overload-etc
836 :     Description:
837 :    
838 :     1. Added _overload as a synonym for overload for backward compatibility.
839 :     (Control.overloadKW must be true for either version to be accepted.)
840 :    
841 :     2. Fixed bug in install script that caused more things to be installed
842 :     than what was requested in config/targets.
843 :    
844 :     3. Made CM aware of the (_)overload construct so that autoloading
845 :     works.
846 :    
847 :     ----------------------------------------------------------------------
848 :     Name: Matthias Blume
849 : blume 1138 Date: 2002/03/12 22:03:00 EST
850 :     Tag: blume-20020312-url
851 :     Description:
852 :    
853 :     Forgot to update BOOT and srcarchiveurl.
854 :    
855 :     ----------------------------------------------------------------------
856 :     Name: Matthias Blume
857 : blume 1137 Date: 2002/03/12 17:30:00 EST
858 :     Tag: blume-20020312-version110392
859 :     Description:
860 :    
861 :     Yet another version number bump (because of small changes to the
862 :     binfile format). Version number is now 110.39.2. NEW BOOTFILES!
863 :    
864 :     Changes:
865 :    
866 :     The new pid generation scheme described a few weeks ago was overly
867 :     complicated. I implemented a new mechanism that is simpler and
868 :     provides a bit more "stability": Once CM has seen a compilation
869 :     unit, it keeps its identity constant (as long as you do not delete
870 :     those crucial CM/GUID/* files). This means that when you change
871 : blume 1145 an interface, compile, then go back to the old interface, and
872 : blume 1137 compile again, you arrive at the original pid.
873 :    
874 :     There now also is a mechanism that instructs CM to use the plain
875 :     environment hash as a module's pid (effectively making its GUID
876 :     the empty string). For this, "noguid" must be specified as an
877 :     option to the .sml file in question within its .cm file.
878 :     This is most useful for code that is being generated by tools such
879 :     as ml-nlffigen (because during development programmers tend to
880 :     erase the tool's entire output directory tree including CM's cached
881 :     GUIDs). "noguid" is somewhat dangerous (since it can be used to locally
882 :     revert to the old, broken behavior of SML/NJ, but in specific cases
883 :     where there is no danger of interface confusion, its use is ok
884 :     (I think).
885 :    
886 :     ml-nlffigen by default generates "noguid" annotations. They can be
887 :     turned off by specifying -guid in its command line.
888 :    
889 :     ----------------------------------------------------------------------
890 : george 1136 Name: Lal George
891 :     Date: 2002/03/12 12 14:42:36 EST
892 :     Tag: george-20020312-frequency-computation
893 :     Description:
894 :    
895 :     Integrated jump chaining and static block frequency into the
896 :     compiler. More details and numbers later.
897 : leunga 1025
898 : george 1003 ----------------------------------------------------------------------
899 : george 1133 Name: Lal George
900 :     Date: 2002/03/11 11 22:38:53 EST
901 :     Tag: george-20020311-jump-chain-elim
902 :     Description:
903 :    
904 :     Tested the jump chain elimination on all architectures (except the
905 :     hppa). This is on by default right now and is profitable for the
906 :     alpha and x86, however, it may not be profitable for the sparc and ppc
907 :     when compiling the compiler.
908 :    
909 :     The gc test will typically jump to a label at the end of the cluster,
910 :     where there is another jump to an external cluster containing the actual
911 :     code to invoke gc. This is to allow factoring of common gc invocation
912 :     sequences. That is to say, we generate:
913 :    
914 :     f:
915 :     testgc
916 :     ja L1 % jump if above to L1
917 :    
918 :     L1:
919 :     jmp L2
920 :    
921 :    
922 :     After jump chain elimination the 'ja L1' instructions is converted to
923 :     'ja L2'. On the sparc and ppc, many of the 'ja L2' instructions may end
924 :     up being implemented in their long form (if L2 is far away) using:
925 :    
926 :     jbe L3 % jump if below or equal to L3
927 :     jmp L2
928 :     L3:
929 :     ...
930 :    
931 :    
932 :     For large compilation units L2 may be far away.
933 :    
934 :    
935 :     ----------------------------------------------------------------------
936 : blume 1132 Name: Matthias Blume
937 :     Date: 2002/03/11 13:30:00 EST
938 :     Tag: blume-20020311-mltreeeval
939 :     Description:
940 :    
941 :     A functor parameter was missing.
942 :    
943 :     ----------------------------------------------------------------------
944 : leunga 1130 Name: Allen Leung
945 : leunga 1131 Date: 2002/03/11 10:30:00 EST
946 : leunga 1142 Tag: leunga-20020311-runtime-string0
947 : leunga 1131 Description:
948 :    
949 :     The representation of the empty string now points to a
950 :     legal null terminated C string instead of unit. It is now possible
951 :     to convert an ML string into C string with InlineT.CharVector.getData.
952 :     This compiles into one single machine instruction.
953 :    
954 :     ----------------------------------------------------------------------
955 :     Name: Allen Leung
956 : leunga 1130 Date: 2002/03/10 23:55:00 EST
957 :     Tag: leunga-20020310-x86-call
958 :     Description:
959 :    
960 :     Added machine generation for CALL instruction (relative displacement mode)
961 :    
962 :     ----------------------------------------------------------------------
963 : blume 1128 Name: Matthias Blume
964 :     Date: 2002/03/08 16:05:00
965 :     Tag: blume-20020308-entrypoints
966 :     Description:
967 :    
968 :     Version number bumped to 110.39.1. NEW BOOTFILES!
969 :    
970 :     Entrypoints: non-zero offset into a code object where execution should begin.
971 :    
972 :     - Added the notion of an entrypoint to CodeObj.
973 :     - Added reading/writing of entrypoint info to Binfile.
974 :     - Made runtime system bootloader aware of entrypoints.
975 :     - Use the address of the label of the first function given to mlriscGen
976 :     as the entrypoint. This address is currently always 0, but it will
977 :     not be 0 once we turn on block placement.
978 :     - Removed the linkage cluster code (which was The Other Way(tm) of dealing
979 :     with entry points) from mlriscGen.
980 :    
981 :     ----------------------------------------------------------------------
982 : leunga 1127 Name: Allen Leung
983 :     Date: 2002/03/07 20:45:00 EST
984 :     Tag: leunga-20020307-x86-cmov
985 :     Description:
986 :    
987 :     Bug fixes for CMOVcc on x86.
988 :    
989 :     1. Added machine code generation for CMOVcc
990 :     2. CMOVcc is now generated in preference over SETcc on PentiumPro or above.
991 :     3. CMOVcc cannot have an immediate operand as argument.
992 :    
993 :     ----------------------------------------------------------------------
994 : blume 1126 Name: Matthias Blume
995 :     Date: 2002/03/07 16:15:00 EST
996 :     Tag: blume-20020307-controls
997 :     Description:
998 :    
999 :     This is a very large but mostly boring patch which makes (almost)
1000 :     every tuneable compiler knob (i.e., pretty much everything under
1001 :     Control.* plus a few other things) configurable via both the command
1002 :     line and environment variables in the style CM did its configuration
1003 :     until now.
1004 :    
1005 :     Try starting sml with '-h' (or, if you are brave, '-H')
1006 :    
1007 :     To this end, I added a structure Controls : CONTROLS to smlnj-lib.cm which
1008 :     implements the underlying generic mechanism.
1009 :    
1010 :     The interface to some of the existing such facilities has changed somewhat.
1011 :     For example, the MLRiscControl module now provides mkFoo instead of getFoo.
1012 :     (The getFoo interface is still there for backward-compatibility, but its
1013 :     use is deprecated.)
1014 :    
1015 :     The ml-build script passes -Cxxx=yyy command-line arguments through so
1016 :     that one can now twiddle the compiler settings when using this "batch"
1017 :     compiler.
1018 :    
1019 :     TODO items:
1020 :    
1021 :     We should go through and throw out all controls that are no longer
1022 :     connected to anything. Moreover, we should go through and provide
1023 :     meaningful (and correct!) documentation strings for those controls
1024 :     that still are connected.
1025 :    
1026 :     Currently, multiple calls to Controls.new are accepted (only the first
1027 :     has any effect). Eventually we should make sure that every control
1028 :     is being made (via Controls.new) exactly once. Future access can then
1029 :     be done using Controls.acc.
1030 :    
1031 :     Finally, it would probably be a good idea to use the getter-setter
1032 :     interface to controls rather than ref cells. For the time being, both
1033 :     styles are provided by the Controls module, but getter-setter pairs are
1034 :     better if thread-safety is of any concern because they can be wrapped.
1035 :    
1036 :     *****************************************
1037 :    
1038 :     One bug fix: The function blockPlacement in three of the MLRISC
1039 :     backpatch files used to be hard-wired to one of two possibilities at
1040 :     link time (according to the value of the placementFlag). But (I
1041 :     think) it should rather sense the flag every time.
1042 :    
1043 :     *****************************************
1044 :    
1045 :     Other assorted changes (by other people who did not supply a HISTORY entry):
1046 :    
1047 :     1. the cross-module inliner now works much better (Monnier)
1048 :     2. representation of weights, frequencies, and probabilities in MLRISC
1049 :     changed in preparation of using those for weighted block placement
1050 :     (Reppy, George)
1051 :    
1052 :     ----------------------------------------------------------------------
1053 : george 1116 Name: Lal George
1054 : george 1124 Date: 2002/03/07 14:44:24 EST 2002
1055 :     Tag: george-20020307-weighted-block-placement
1056 :    
1057 :     Tested the weighted block placement optimization on all architectures
1058 :     (except the hppa) using AMPL to generate the block and edge frequencies.
1059 :     Changes were required in the machine properties to correctly
1060 :     categorize trap instructions. There is an MLRISC flag
1061 :     "weighted-block-placement" that can be used to enable weighted block
1062 :     placement, but this will be ineffective without block/edge
1063 :     frequencies (coming soon).
1064 :    
1065 :    
1066 :     ----------------------------------------------------------------------
1067 :     Name: Lal George
1068 : george 1116 Date: 2002/03/05 17:24:48 EST
1069 :     Tag: george-20020305-linkage-cluster
1070 :    
1071 : george 1124 In order to support the block placement optimization, a new cluster
1072 :     is generated as the very first cluster (called the linkage cluster).
1073 :     It contains a single jump to the 'real' entry point for the compilation
1074 :     unit. Block placement has no effect on the linkage cluster itself, but
1075 :     all the other clusters have full freedom in the manner in which they
1076 :     reorder blocks or functions.
1077 : george 1116
1078 :     On the x86 the typical linkage code that is generated is:
1079 :     ----------------------
1080 :     .align 2
1081 :     L0:
1082 :     addl $L1-L0, 72(%esp)
1083 : george 1124 jmp L1
1084 : george 1116
1085 :    
1086 :     .align 2
1087 :     L1:
1088 :     ----------------------
1089 :    
1090 :     72(%esp) is the memory location for the stdlink register. This
1091 :     must contain the address of the CPS function being called. In the
1092 : george 1124 above example, it contains the address of L0; before
1093 : george 1116 calling L1 (the real entry point for the compilation unit), it
1094 :     must contain the address for L1, and hence
1095 :    
1096 :     addl $L1-L0, 72(%esp)
1097 :    
1098 : george 1124 I have tested this on all architectures except the hppa.The increase
1099 :     in code size is of course negligible
1100 : george 1116
1101 :     ----------------------------------------------------------------------
1102 : leunga 1115 Name: Allen Leung
1103 :     Date: 2002/03/03 13:20:00 EST
1104 :     Tag: leunga-20020303-mlrisc-tools
1105 :    
1106 :     Added #[ ... ] expressions to mlrisc tools
1107 :    
1108 :     ----------------------------------------------------------------------
1109 : blume 1096 Name: Matthias Blume
1110 : blume 1098 Date: 2002/02/27 12:29:00 EST
1111 :     Tag: blume-20020227-cdebug
1112 :     Description:
1113 :    
1114 :     - made types in structure C and C_Debug to be equal
1115 :     - got rid of code duplication (c-int.sml vs. c-int-debug.sml)
1116 :     - there no longer is a C_Int_Debug (C_Debug is directly derived from C)
1117 :    
1118 :     ----------------------------------------------------------------------
1119 :     Name: Matthias Blume
1120 : blume 1096 Date: 2002/02/26 12:00:00 EST
1121 :     Tag: blume-20020226-ffi
1122 :     Description:
1123 :    
1124 :     1. Fixed a minor bug in CM's "noweb" tool:
1125 :     If numbering is turned off, then truly don't number (i.e., do not
1126 :     supply the -L option to noweb). The previous behavior was to supply
1127 :     -L'' -- which caused noweb to use the "default" line numbering scheme.
1128 :     Thanks to Chris Richards for pointing this out (and supplying the fix).
1129 :    
1130 :     2. Once again, I reworked some aspects of the FFI:
1131 :    
1132 :     A. The incomplete/complete type business:
1133 :    
1134 :     - Signatures POINTER_TO_INCOMPLETE_TYPE and accompanying functors are
1135 :     gone!
1136 :     - ML types representing an incomplete type are now *equal* to
1137 :     ML types representing their corresponding complete types (just like
1138 :     in C). This is still safe because ml-nlffigen will not generate
1139 :     RTTI for incomplete types, nor will it generate functions that
1140 :     require access to such RTTI. But when ML code generated from both
1141 :     incomplete and complete versions of the C type meet, the ML types
1142 :     are trivially interoperable.
1143 :    
1144 :     NOTE: These changes restore the full generality of the translation
1145 :     (which was previously lost when I eliminated functorization)!
1146 :    
1147 :     B. Enum types:
1148 :    
1149 :     - Structure C now has a type constructor "enum" that is similar to
1150 :     how the "su" constructor works. However, "enum" is not a phantom
1151 :     type because each "T enum" has values (and is isomorphic to
1152 :     MLRep.Signed.int).
1153 :     - There are generic access operations for enum objects (using
1154 :     MLRep.Signed.int).
1155 :     - ml-nlffigen will generate a structure E_foo for each "enum foo".
1156 :     * The structure contains the definition of type "mlrep" (the ML-side
1157 :     representation type of the enum). Normally, mlrep is the same
1158 :     as "MLRep.Signed.int", but if ml-nlffigen was invoked with "-ec",
1159 :     then mlrep will be defined as a datatype -- thus facilitating
1160 :     pattern matching on mlrep values.
1161 :     ("-ec" will be suppressed if there are duplicate values in an
1162 :     enumeration.)
1163 :     * Constructors ("-ec") or values (no "-ec") e_xxx of type mlrep
1164 :     will be generated for each C enum constant xxx.
1165 :     * Conversion functions m2i and i2m convert between mlrep and
1166 :     MLRep.Signed.int. (Without "-ec", these functions are identities.)
1167 :     * Coversion functions c and ml convert between mlrep and "tag enum".
1168 :     * Access functions (get/set) fetch and store mlrep values.
1169 :     - By default (unless ml-nlffigen was invoked with "-nocollect"), unnamed
1170 :     enumerations are merged into one single enumeration represented by
1171 :     structure E_'.
1172 :    
1173 :     ----------------------------------------------------------------------
1174 : leunga 1080 Name: Allen Leung
1175 : leunga 1094 Date: 2002/02/25 04:45:00 EST
1176 :     Tag: leunga-20020225-cps-spill
1177 :    
1178 :     This is a new implementation of the CPS spill phase.
1179 :     The new phase is in the new file compiler/CodeGen/cpscompile/spill-new.sml
1180 :     In case of problems, replace it with the old file spill.sml
1181 :    
1182 :     The current compiler runs into some serious performance problems when
1183 :     constructing a large record. This can happen when we try to compile a
1184 :     structure with many items. Even a very simple structure like the following
1185 :     makes the compiler slow down.
1186 :    
1187 :     structure Foo = struct
1188 :     val x_1 = 0w1 : Word32.int
1189 :     val x_2 = 0w2 : Word32.int
1190 :     val x_3 = 0w3 : Word32.int
1191 :     ...
1192 :     val x_N = 0wN : Word32.int
1193 :     end
1194 :    
1195 :     The following table shows the compile time, from N=1000 to N=4000,
1196 :     with the old compiler:
1197 :    
1198 :     N
1199 :     1000 CPS 100 spill 0.04u 0.00s 0.00g
1200 :     MLRISC ra 0.06u 0.00s 0.05g
1201 :     (spills = 0 reloads = 0)
1202 :     TOTAL 0.63u 0.07s 0.21g
1203 :    
1204 :     1100 CPS 100 spill 8.25u 0.32s 0.64g
1205 :     MLRISC ra 5.68u 0.59s 3.93g
1206 :     (spills = 0 reloads = 0)
1207 :     TOTAL 14.71u 0.99s 4.81g
1208 :    
1209 :     1500 CPS 100 spill 58.55u 2.34s 1.74g
1210 :     MLRISC ra 5.54u 0.65s 3.91g
1211 :     (spills = 543 reloads = 1082)
1212 :     TOTAL 65.40u 3.13s 6.00g
1213 :    
1214 :     2000 CPS 100 spill 126.69u 4.84s 3.08g
1215 :     MLRISC ra 0.80u 0.10s 0.55g
1216 :     (spills = 42 reloads = 84)
1217 :     TOTAL 129.42u 5.10s 4.13g
1218 :    
1219 :     3000 CPS 100 spill 675.59u 19.03s 11.64g
1220 :     MLRISC ra 2.69u 0.27s 1.38g
1221 :     (spills = 62 reloads = 124)
1222 :     TOTAL 682.48u 19.61s 13.99g
1223 :    
1224 :     4000 CPS 100 spill 2362.82u 56.28s 43.60g
1225 :     MLRISC ra 4.96u 0.27s 2.72g
1226 :     (spills = 85 reloads = 170)
1227 :     TOTAL 2375.26u 57.21s 48.00g
1228 :    
1229 :     As you can see the old cps spill module suffers from some serious
1230 : leunga 1115 performance problem. But since I cannot decipher the old code fully,
1231 :     instead of patching the problems up, I'm reimplementing it
1232 : leunga 1094 with a different algorithm. The new code is more modular,
1233 :     smaller when compiled, and substantially faster
1234 :     (O(n log n) time and O(n) space). Timing of the new spill module:
1235 :    
1236 :     4000 CPS 100 spill 0.02u 0.00s 0.00g
1237 :     MLRISC ra 0.25u 0.02s 0.15g
1238 :     (spills=1 reloads=3)
1239 :     TOTAL 7.74u 0.34s 1.62g
1240 :    
1241 :     Implementation details:
1242 :    
1243 :     As far as I can tell, the purpose of the CPS spill module is to make sure the
1244 :     number of live variables at any program point (the bandwidth)
1245 :     does not exceed a certain limit, which is determined by the
1246 :     size of the spill area.
1247 :    
1248 :     When the bandwidth is too large, we decrease the register pressure by
1249 :     packing live variables into spill records. How we achieve this is
1250 :     completely different than what we did in the old code.
1251 :    
1252 :     First, there is something about the MLRiscGen code generator
1253 :     that we should be aware of:
1254 :    
1255 :     o MLRiscGen performs code motion!
1256 :    
1257 :     In particular, it will move floating point computations and
1258 :     address computations involving only the heap pointer to
1259 :     their use sites (if there is only a single use).
1260 :     What this means is that if we have a CPS record construction
1261 :     statement
1262 :    
1263 :     RECORD(k,vl,w,e)
1264 :    
1265 :     we should never count the new record address w as live if w
1266 :     has only one use (which is often the case).
1267 :    
1268 :     We should do something similar to floating point, but the transformation
1269 :     there is much more complex, so I won't deal with that.
1270 :    
1271 :     Secondly, there are now two new cps primops at our disposal:
1272 :    
1273 :     1. rawrecord of record_kind option
1274 :     This pure operator allocates some uninitialized storage from the heap.
1275 :     There are two forms:
1276 :    
1277 :     rawrecord NONE [INT n] allocates a tagless record of length n
1278 :     rawrecord (SOME rk) [INT n] allocates a tagged record of length n
1279 :     and initializes the tag.
1280 :    
1281 :     2. rawupdate of cty
1282 :     rawupdate cty (v,i,x)
1283 :     Assigns to x to the ith component of record v.
1284 :     The storelist is not updated.
1285 :    
1286 :     We use these new primops for both spilling and increment record construction.
1287 :    
1288 :     1. Spilling.
1289 :    
1290 :     This is implemented with a linear scan algorithm (but generalized
1291 :     to trees). The algorithm will create a single spill record at the
1292 :     beginning of the cps function and use rawupdate to spill to it,
1293 :     and SELECT or SELp to reload from it. So both spills and reloads
1294 :     are fine-grain operations. In contrast, in the old algorithm
1295 :     "spills" have to be bundled together in records.
1296 :    
1297 :     Ideally, we should sink the spill record construction to where
1298 :     it is needed. We can even split the spill record into multiple ones
1299 :     at the places where they are needed. But CPS is not a good
1300 :     representation for global code motion, so I'll keep it simple and
1301 :     am not attempting this.
1302 :    
1303 :     2. Incremental record construction (aka record splitting).
1304 :    
1305 :     Long records with many component values which are simulatenously live
1306 :     (recall that single use record addresses are not considered to
1307 :     be live) are constructed with rawrecord and rawupdate.
1308 :     We allocate space on the heap with rawrecord first, then gradually
1309 :     fill it in with rawupdate. This is the technique suggested to me
1310 :     by Matthias.
1311 :    
1312 :     Some restrictions on when this is applicable:
1313 :     1. It is not a VECTOR record. The code generator currently does not handle
1314 :     this case. VECTOR record uses double indirection like arrays.
1315 :     2. All the record component values are defined in the same "basic block"
1316 :     as the record constructor. This is to prevent speculative
1317 :     record construction.
1318 :    
1319 :     ----------------------------------------------------------------------
1320 :     Name: Allen Leung
1321 : leunga 1086 Date: 2002/02/22 01:02:00 EST
1322 :     Tag: leunga-20020222-mlrisc-tools
1323 :    
1324 :     Minor bug fixes in the parser and rewriter
1325 :    
1326 :     ----------------------------------------------------------------------
1327 :     Name: Allen Leung
1328 : leunga 1085 Date: 2002/02/21 20:20:00 EST
1329 :     Tag: leunga-20020221-peephole
1330 :    
1331 :     Regenerated the peephole files. Some contained typos in the specification
1332 :     and some didn't compile because of pretty printing bugs in the old version
1333 :     of 'nowhere'.
1334 :    
1335 :     ----------------------------------------------------------------------
1336 :     Name: Allen Leung
1337 : leunga 1079 Date: 2002/02/19 20:20:00 EST
1338 :     Tag: leunga-20020219-mlrisc-tools
1339 :     Description:
1340 :    
1341 :     Minor bug fixes to the mlrisc-tools library:
1342 :    
1343 :     1. Fixed up parsing colon suffixed keywords
1344 :     2. Added the ability to shut the error messages up
1345 :     3. Reimplemented the pretty printer and fixed up/improved
1346 :     the pretty printing of handle and -> types.
1347 :     4. Fixed up generation of literal symbols in the nowhere tool.
1348 :     5. Added some SML keywords to to sml.sty
1349 :    
1350 :     ----------------------------------------------------------------------
1351 :     Name: Matthias Blume
1352 : blume 1078 Date: 2002/02/19 16:20:00 EST
1353 :     Tag: blume-20020219-cmffi
1354 :     Description:
1355 :    
1356 :     A wild mix of changes, some minor, some major:
1357 :    
1358 :     * All C FFI-related libraries are now anchored under $c:
1359 :     $/c.cm --> $c/c.cm
1360 :     $/c-int.cm --> $c/internals/c-int.cm
1361 :     $/memory.cm --> $c/memory/memory.cm
1362 :    
1363 :     * "make" tool (in CM) now treats its argument pathname slightly
1364 :     differently:
1365 :     1. If the native expansion is an absolute name, then before invoking
1366 :     the "make" command on it, CM will apply OS.Path.mkRelative
1367 :     (with relativeTo = OS.FileSys.getDir()) to it.
1368 :     2. The argument will be passed through to subsequent phases of CM
1369 :     processing without "going native". In particular, if the argument
1370 :     was an anchored path, then "make" will not lose track of that anchor.
1371 :    
1372 :     * Compiler backends now "know" their respective C calling conventions
1373 :     instead of having to be told about it by ml-nlffigen. This relieves
1374 :     ml-nlffigen from one of its burdens.
1375 :    
1376 :     * The X86Backend has been split into X86CCallBackend and X86StdCallBackend.
1377 :    
1378 :     * Export C_DEBUG and C_Debug from $c/c.cm.
1379 :    
1380 :     * C type encoding in ml-nlffi-lib has been improved to model the conceptual
1381 :     subtyping relationship between incomplete pointers and their complete
1382 :     counterparts. For this, ('t, 'c) ptr has been changed to 'o ptr --
1383 :     with the convention of instantiating 'o with ('t, 'c) obj whenever
1384 :     the pointer target type is complete. In the incomplete case, 'o
1385 :     will be instantiated with some "'c iobj" -- a type obtained by
1386 :     using one of the functors PointerToIncompleteType or PointerToCompleteType.
1387 :    
1388 :     Operations that work on both incomplete and complete pointer types are
1389 :     typed as taking an 'o ptr while operations that require the target to
1390 :     be known are typed as taking some ('t, 'c) obj ptr.
1391 :    
1392 :     voidptr is now a bit "more concrete", namely "type voidptr = void ptr'"
1393 :     where void is an eqtype without any values. This makes it possible
1394 :     to work on voidptr values using functions meant to operate on light
1395 :     incomplete pointers.
1396 :    
1397 :     * As a result of the above, signature POINTER_TO_INCOMPLETE_TYPE has
1398 :     been vastly simplified.
1399 :    
1400 :     ----------------------------------------------------------------------
1401 :     Name: Matthias Blume
1402 : blume 1076 Date: 2002/02/19 10:48:00 EST
1403 :     Tag: blume-20020219-pqfix
1404 :     Description:
1405 :    
1406 :     Applied Chris Okasaki's bug fix for priority queues.
1407 :    
1408 :     ----------------------------------------------------------------------
1409 :     Name: Matthias Blume
1410 : blume 1073 Date: 2002/02/15 17:05:00
1411 : blume 1069 Tag: Release_110_39
1412 :     Description:
1413 :    
1414 : blume 1073 Last-minute retagging is becoming a tradition... :-(
1415 :    
1416 :     This is the working release 110.39.
1417 :    
1418 :     ----------------------------------------------------------------------
1419 :     Name: Matthias Blume
1420 :     Date: 2002/02/15 16:00:00 EST
1421 :     Tag: Release_110_39-orig
1422 :     Description:
1423 :    
1424 : blume 1069 Working release 110.39. New bootfiles.
1425 :    
1426 : blume 1073 (Update: There was a small bug in the installer so it wouldn't work
1427 :     with all shells. So I retagged. -Matthias)
1428 :    
1429 : blume 1069 ----------------------------------------------------------------------
1430 :     Name: Matthias Blume
1431 : blume 1068 Date: 2002/02/15 14:17:00 EST
1432 :     Tag: blume-20020215-showbindings
1433 :     Description:
1434 :    
1435 :     Added EnvRef.listBoundSymbols and CM.State.showBindings. Especially
1436 :     the latter can be useful for exploring what bindings are available at
1437 :     the interactive prompt. (The first function returns only the list
1438 :     of symbols that are really bound, the second prints those but also the
1439 :     ones that CM's autoloading mechanism knows about.)
1440 :    
1441 :     ----------------------------------------------------------------------
1442 :     Name: Matthias Blume
1443 : blume 1067 Date: 2002/02/15 12:08:00 EST
1444 :     Tag: blume-20020215-iptrs
1445 :     Description:
1446 :    
1447 :     Two improvements to ml-nlffigen:
1448 :    
1449 :     1. Write files only if they do not exist or if their current contents
1450 :     do not coincide with what's being written. (That is, avoid messing
1451 :     with the time stamps unless absolutely necessary.)
1452 :    
1453 :     2. Implement a "repository" mechanism for generated files related
1454 :     to "incomplete pointer types". See the README file for details.
1455 :    
1456 :     ----------------------------------------------------------------------
1457 :     Name: Matthias Blume
1458 : blume 1066 Date: 2002/02/14 11:50:00 EST
1459 :     Tag: blume-20020214-quote
1460 :     Description:
1461 :    
1462 :     Added a type 't t_' to tag.sml (in ml-nlffi-lib.cm). This is required
1463 :     because of the new and improved tag generation scheme. (Thanks to Allen
1464 :     Leung for pointing it out.)
1465 :    
1466 :     ----------------------------------------------------------------------
1467 : george 1065 Name: Lal George
1468 :     Date: 2002/02/14 09:55:27 EST 2002
1469 :     Tag: george-20020214-isabelle-bug
1470 :     Description:
1471 :    
1472 :     Fixed the MLRISC bug sent by Markus Wenzel regarding the compilation
1473 :     of Isabelle on the x86.
1474 :    
1475 :     From Allen:
1476 :     -----------
1477 :     I've found the problem:
1478 :    
1479 :     in ra-core.sml, I use the counter "blocked" to keep track of the
1480 :     true number of elements in the freeze queue. When the counter goes
1481 :     to zero, I skip examining the queue. But I've messed up the
1482 :     bookkeeping in combine():
1483 :    
1484 :     else ();
1485 :     case !ucol of
1486 :     PSEUDO => (if !cntv > 0 then
1487 :     (if !cntu > 0 then blocked := !blocked - 1 else ();
1488 :     ^^^^^^^^^^^^^^^^^^^^^^^
1489 :     moveu := mergeMoveList(!movev, !moveu)
1490 :     )
1491 :     else ();
1492 :    
1493 :     combine() is called to coalesce two nodes u and v.
1494 :     I think I was thinking that if the move counts of u and v are both
1495 :     greater than zero then after they are coalesced then one node is
1496 :     removed from the freeze queue. Apparently I was thinking that
1497 :     both u and v are of low degree, but that's clearly not necessarily true.
1498 :    
1499 :    
1500 :     02/12/2002:
1501 :     Here's the patch. HOL now compiles.
1502 :    
1503 :     I don't know how this impact on performance (compile
1504 :     time or runtime). This bug caused the RA (especially on the x86)
1505 :     to go thru the potential spill phase when there are still nodes on the
1506 :     freeze queue.
1507 :    
1508 :    
1509 :    
1510 :    
1511 :     ----------------------------------------------------------------------
1512 : blume 1058 Name: Matthias Blume
1513 : blume 1064 Date: 2002/02/13 22:40:00 EST
1514 :     Tag: blume-20020213-fptr-rtti
1515 :     Description:
1516 :    
1517 :     Fixed a bug in ml-nlffigen that was introduced with one of the previous
1518 :     updates.
1519 :    
1520 :     ----------------------------------------------------------------------
1521 :     Name: Matthias Blume
1522 : blume 1063 Date: 2002/02/13 16:41:00 EST
1523 :     Tag: blume-20020213-cmlpq
1524 :     Description:
1525 :    
1526 :     Added new priority queue export symbols (which have just been added to
1527 :     smlnj-lib.cm) to CML's version of smlnj-lib.cm. (Otherwise CML would
1528 :     not compile and the installer would choke.)
1529 :    
1530 :     ----------------------------------------------------------------------
1531 :     Name: Matthias Blume
1532 : blume 1062 Date: 2002/02/13 16:15:00 EST
1533 :     Tag: blume-20020213-various
1534 :     Description:
1535 :    
1536 :     1. More tweaks to ml-nlffigen:
1537 :    
1538 :     - better internal datastructures (resulting in slight speedup)
1539 :     - "-match" option requires exact match
1540 :     - "localized" gensym counters (untagged structs/unions nested within
1541 :     other structs/unions or within typedefs get a fresh counter; their
1542 :     tag will be prefixed by a concatenation of their parents' tags)
1543 :     - bug fixes (related to calculation of transitive closure of types
1544 :     to be included in the output)
1545 :    
1546 :     2. Minor Basis updates:
1547 :    
1548 :     - added implementations for List.collate and Option.app
1549 :    
1550 :     ----------------------------------------------------------------------
1551 :     Name: Matthias Blume
1552 : blume 1060 Date: 2002/02/11 15:55:00 EST
1553 :     Tag: blume-20020211-gensym
1554 :     Description:
1555 :    
1556 :     Added a "-gensym" option to command line of ml-nlffigen. This can be
1557 :     used to specify a "stem" -- a string that is inserted in all "gensym'd"
1558 :     names (ML structure names that correspond to unnamed C structs, unions,
1559 :     and enums), so that separate runs of ml-nlffigen do not clash.
1560 :    
1561 :     ----------------------------------------------------------------------
1562 :     Name: Matthias Blume
1563 : blume 1059 Date: 2002/02/11 12:05:00 EST
1564 :     Tag: blume-20020211-gensml
1565 :     Description:
1566 :    
1567 :     A quick fix for a problem with GenSML (in the pgraph-util library):
1568 :     Make generation of toplevel "local" optional. (Strictly speaking,
1569 :     signature definitions within "local" are not legal SML.)
1570 :    
1571 :     Other than that: updates to INSTALL and cm/TODO.
1572 :    
1573 :     ----------------------------------------------------------------------
1574 :     Name: Matthias Blume
1575 : blume 1058 Date: 2002/02/08 15:00:00 EST
1576 :     Tag: blume-20020208-uniquepid
1577 :     Description:
1578 :    
1579 :     0. Version number has been bumped to 110.38.1. NEW BOOTFILES!!!
1580 :    
1581 :     1. The installer (config/install.sh) has gotten smarter:
1582 :    
1583 :     - Configuration options are a bit easier to specify now
1584 :     (in config/targets).
1585 :     - Bug in recognizing .tar.bz2 files fixed.
1586 :     - Installer automatically resolves dependencies between
1587 :     configuration options (e.g., if you ask for eXene, you will
1588 :     also get cml -- regardless whether you asked for it or not).
1589 :     - Installer can run in "quieter mode" by setting the environment
1590 :     variable INSTALL_QUIETLY to "true". "Quieter" does not mean
1591 :     "completely silent", though.
1592 :     - Build HashCons library as part of smlnj-lib.
1593 :    
1594 :     2. A new scheme for assigning persistent identifiers to compilation
1595 :     units (and, by extension, to types etc.) has been put into place.
1596 :     This fixes a long-standing bug where types and even dynamic values
1597 :     can get internally confused, thereby compromising type safety
1598 :     (abstraction) and dynamic correctness. See
1599 :    
1600 :     http://cm.bell-labs.com/cm/cs/who/blume/pid-confusion.tgz
1601 :    
1602 :     for an example of how things could go wrong until now.
1603 :    
1604 :     The downside of the new scheme is that pids are not quite as
1605 :     persistent as they used to be: CM will generate a fresh pid
1606 :     for every compilation unit that it thinks it sees for the first
1607 :     time. That means that if you compile starting from a clean, fresh
1608 :     source tree at two different times, you end up with different
1609 :     binaries.
1610 :    
1611 :     Cutoff recompilation, however, has not been compromised because
1612 :     CM keeps pid information in special caches between runs.
1613 :    
1614 :     ----------------------------------------------------------------------
1615 : george 1053 Name: Lal George
1616 : george 1055 Date: 2002/02/07 15:34:13 EST 2002
1617 :     Tag: <none>
1618 :     Description:
1619 :    
1620 :     Compilers that generate assembly code may produce global labels
1621 :     whose value is resolved at link time. The various peephole optimization
1622 :     modules did not take this in account.
1623 :    
1624 :     TODO. The Labels.addrOf function should really return an option
1625 :     type so that clients are forced to deal with this issue, rather
1626 :     than an exception being raised.
1627 :    
1628 :     ----------------------------------------------------------------------
1629 :     Name: Lal George
1630 : george 1053 Date: 2002/02/06 13:55:02 EST
1631 :     Tag: george-20020206-ra-breakup
1632 :     Description:
1633 :    
1634 :     1. A bug fix from Allen.
1635 :    
1636 :     A typo causes extra fstp %st(0)'s to be generated at compensation
1637 :     edges, which might cause stack underflow traps at runtime. This
1638 :     occurs in fft where there are extraneous fstps right before the 'into'
1639 :     trap instruction (in this case they are harmless since none of the
1640 :     integers overflow.)
1641 :    
1642 : george 1054 2. Pulled out various utility modules that were embedded in the modules
1643 : george 1053 of the register allocator. I need these modules for other purposes, but
1644 : george 1054 they are not complete enough to put into a library (just yet).
1645 : george 1053 ----------------------------------------------------------------------
1646 : blume 1049 Name: Matthias Blume
1647 :     Date: 2002/01/31 16:05:00 EST
1648 :     Tag: blume-20020131-sparc-ccalls
1649 :     Description:
1650 :    
1651 :     1. C-calls on Sparc needlessly allocated a huge chunk (96 bytes)
1652 :     of extra stack space by mistake. Fixed.
1653 :    
1654 :     2. Bug in logic of handling of command-line options in ml-nlffigen fixed.
1655 :    
1656 :     ----------------------------------------------------------------------
1657 : leunga 1048 Name: Allen Leung
1658 :     Date: 2002/01/30
1659 :     Tag: leunga-20020130-nowhere-bug-fix
1660 :     Description:
1661 :    
1662 :     MLRISC bug fixes:
1663 :     1. Fixed a bindings computation bug in the 'nowhere' program generator tool.
1664 :     2. MachineInt.fromString was negating its value.
1665 :    
1666 :     ----------------------------------------------------------------------
1667 : blume 1039 Name: Matthias Blume
1668 : blume 1047 Date: 2002/01/29
1669 :     Tag: blume-20020129-INSTALL
1670 :     Description:
1671 :    
1672 :     - Added somewhat detailed installation instructions (file INSTALL).
1673 :     - Fixed curl-detection bug in config/install.sh.
1674 :     - It is now possible to select the URL getter using the URLGETTER
1675 :     environment variable:
1676 :    
1677 :     not set / "unknown" --> automatic detection (script tries wget,
1678 :     curl, and lynx)
1679 :     "wget" / "curl" / "lynx" --> use the specified program (script "knows"
1680 :     how to properly invoke them)
1681 :     other --> use $URLGETTER directly, it must take
1682 :     precisely two command-line arguments
1683 :     (source URL and destination file name)
1684 :    
1685 :     ----------------------------------------------------------------------
1686 :     Name: Matthias Blume
1687 : blume 1044 Date: 2002/01/28
1688 : blume 1045 Tag: blume-20020128-sparc-ccalls
1689 :     Description:
1690 :    
1691 :     - Fixed problem with calculation of "used" registers in sparc-c-calls.
1692 :     - Make use of the allocParam argument in sparc-c-calls.
1693 :    
1694 :     ----------------------------------------------------------------------
1695 :     Name: Matthias Blume
1696 :     Date: 2002/01/28
1697 : blume 1044 Tag: blume-20020128-allocParam
1698 :     Description:
1699 :    
1700 :     John Reppy: Changes c-calls API to accept client-callback for
1701 :     allocating extra stack space.
1702 :     me: Corresponding changes to mlriscGen (using a dummy argument that
1703 :     does not change the current behavior).
1704 :    
1705 :     ----------------------------------------------------------------------
1706 :     Name: Matthias Blume
1707 : blume 1040 Date: 2002/01/28 12:00:00
1708 :     Tag: Release_110_38
1709 :     Description:
1710 :    
1711 :     This time for real!!!
1712 :    
1713 :     ----------------------------------------------------------------------
1714 :     Name: Matthias Blume
1715 : blume 1039 Date: 2002/01/28 10:56:00 EST
1716 :     Tag: blume-20020128-retraction
1717 :     Description:
1718 :    
1719 :     0. Retracted earlier 110.38. (The Release_110_38 tag has been replaced
1720 :     with blume-Release_110_38-retracted.)
1721 :    
1722 :     1. Fixed a problem with incorrect rounding modes in real64.sml.
1723 :     (Thanks to Andrew Mccreight <andrew.mccreight@yale.edu>.)
1724 :    
1725 :     2. A bug in ml-nlffigen related to the handling of unnamed structs, unions,
1726 :     and enums fixed. The naming of corresponding ML identifiers should
1727 :     now be consistent again.
1728 :    
1729 :     ----------------------------------------------------------------------
1730 : leunga 1038 Name: Allen Leung
1731 :     Date: 2002/01/27
1732 :     Tag: leunga-20020127-nowhere
1733 :     Description:
1734 :    
1735 :     Added a target called nowhere in the configuration scripts.
1736 :     Enabling this will build the MLRISC 'nowhere' tool (for translating
1737 :     programs with where-clauses into legal SML code) during installation.
1738 :    
1739 :     ----------------------------------------------------------------------
1740 : blume 1036 Name: Matthias Blume
1741 : leunga 1038 Date: 2002/01/25 21:27:00 EST
1742 : blume 1039 Tag: blume-Release_110_38-retracted
1743 : blume 1037 Description:
1744 :    
1745 :     Call it a (working) release! Version is 110.38. Bootfiles are ready.
1746 :    
1747 :     README will be added later.
1748 :    
1749 : blume 1039 !!! NOTE: Re-tagged as blume-Release_110_38-retracted. Original tag
1750 :     (Release_110_38) removed. Reason: Last-minute bug fixes.
1751 :    
1752 : blume 1037 ----------------------------------------------------------------------
1753 :     Name: Matthias Blume
1754 : blume 1036 Date: 2002/01/25
1755 :     Tag: blume-20020125-ffi
1756 :     Description:
1757 :    
1758 :     A large number of tweaks and improvements to ml-nlffi-lib and
1759 :     ml-nlffigen:
1760 :    
1761 :     - ML represenation types have been streamlined
1762 :     - getter and setter functions work with concrete values, not abstract
1763 :     ones where possible
1764 :     - ml-nlffigen command line more flexible (see README file there)
1765 :     - some bugs have been fixed (hopefully)
1766 :    
1767 :     ----------------------------------------------------------------------
1768 : george 1034 Name: Lal George
1769 :     Date: 2002/01/24
1770 :     Tag: george-20020124-risc-ra-interface
1771 :     Description:
1772 :    
1773 :     There is a dramatic simplification in the interface to the
1774 :     register allocator for RISC architectures as a result of making
1775 :     parallel copy instructions explicit.
1776 :    
1777 :     ----------------------------------------------------------------------
1778 : blume 1028 Name: Matthias Blume
1779 : blume 1032 Date: 2002/01/22
1780 :     Tag: blume-20020122-x86-ccalls
1781 :     Description:
1782 :    
1783 :     Bug fix for c-calls on x86 (having to do with how char- and
1784 :     short-arguments are being handled).
1785 :    
1786 :     ----------------------------------------------------------------------
1787 :     Name: Matthias Blume
1788 : blume 1031 Date: 2002/01/21
1789 :     Tag: blume-20020121-ff
1790 :     Description:
1791 :    
1792 :     Another day of fiddling with the FFI...
1793 :    
1794 :     1. Bug fix/workaround: CKIT does not complain about negative array
1795 :     dimensions, so ml-nlffigen has to guard itself against this possibility.
1796 :     (Otherwise a negative dimension would send it into an infinite loop.)
1797 :    
1798 :     2. Some of the abstract types (light objects, light pointers, most "base"
1799 :     types) in structure C are now eqtypes.
1800 :    
1801 :     3. Added constructors and test functions for NULL function pointers.
1802 :    
1803 :     ----------------------------------------------------------------------
1804 :     Name: Matthias Blume
1805 : blume 1028 Date: 2002/01/18
1806 : blume 1030 Tag: blume-20020118-ready-for-new-release
1807 :     Description:
1808 :    
1809 :     Made config/srcarchiveurl point to a new place. (Will provide boot
1810 :     files shortly.)
1811 :    
1812 :     Maybe we christen this to be 110.38?
1813 :    
1814 :     ----------------------------------------------------------------------
1815 :     Name: Matthias Blume
1816 :     Date: 2002/01/18
1817 : blume 1029 Tag: blume-20020118-more-ffifiddle
1818 :     Description:
1819 :    
1820 :     Today's FFI fiddling:
1821 :    
1822 :     - Provided a structure CGetSet with "convenient" versions of C.Get.* and
1823 :     C.Set.* that use concrete (MLRep.*) arguments and results instead
1824 :     of abstract ones.
1825 :    
1826 :     - Provided word-style bit operations etc. for "int" representation
1827 :     types in MLRep.S<Foo>Bitops where <Foo> ranges over Char, Int, Short,
1828 :     and Long.
1829 :    
1830 :     ----------------------------------------------------------------------
1831 :     Name: Matthias Blume
1832 :     Date: 2002/01/18
1833 : blume 1028 Tag: blume-20020118-use-x86-fp
1834 :     Description:
1835 :    
1836 :     Now that x86-fast-fp seems to be working, I turned it back on again
1837 :     by default. (Seems to work fine now, even with the FFI.)
1838 :    
1839 :     Other than that, I added some documentation about the FFI to
1840 :     src/ml-nlffigen/README and updated the FFI test examples in
1841 :     src/ml-nlffi-lib/Tests/*.
1842 :    
1843 :     ----------------------------------------------------------------------
1844 : leunga 1025 Name: Allen Leung
1845 :     Date: 2002/01/17
1846 :     Tag: leunga-20020117-x86-fast-fp-call
1847 :     Description:
1848 :    
1849 :     1. Fixed a problem with handling return fp values when x86's fast fp
1850 :     mode is turned on.
1851 :    
1852 :     2. Minor pretty printing fix for cellset. Print %st(0) as %st(0) instead
1853 :     of %f32.
1854 :    
1855 :     3. Added a constructor INT32lit to the ast of MLRISC tools.
1856 :    
1857 :     ----------------------------------------------------------------------
1858 : blume 1021 Name: Matthias Blume
1859 :     Date: 2002/01/16
1860 :     Tag: blume-20020116-ffifiddle
1861 :     Description:
1862 :    
1863 :     More fiddling with the FFI interface:
1864 :    
1865 :     - Make constness 'c instead of rw wherever possible. This eliminates
1866 :     the need for certain explicit coercions. (However, due to ML's
1867 :     value polymorphism, there will still be many cases where explicit
1868 :     coercions are necessary. Phantom types are not the whole answer
1869 :     to modeling a subtyping relationship in ML.)
1870 :    
1871 :     - ro/rw coersions for pointers added. (Avoids the detour through */&.)
1872 :    
1873 :     - "printf" test example added to src/ml-nlffi-lib/Tests. (Demonstrates
1874 :     clumsy workaround for varargs problem.)
1875 :    
1876 :     ----------------------------------------------------------------------
1877 : george 1016 Name: Lal George
1878 :     Date: 2002/01/15
1879 :     Tag: <none>
1880 :     Description:
1881 :    
1882 :     1. Since COPY instructions are no longer native to the architecture,
1883 :     a generic functor can be used to implement the expandCopies function.
1884 :    
1885 :     2. Allowed EXPORT and IMPORT pseudo-op declarations to appear inside a
1886 :     TEXT segment.
1887 :    
1888 :     ----------------------------------------------------------------------
1889 : blume 1011 Name: Matthias Blume
1890 : blume 1015 Date: 2002/01/15
1891 :     Tag: blume-20020115-ffiupdates
1892 :     Description:
1893 :    
1894 :     1. Fix for bug resulting in single-precision float values being returned
1895 :     incorrectly from FFI calls.
1896 :    
1897 :     2. Small modifications to C FFI API:
1898 :    
1899 :     - memory-allocation routines return straight objects (no options)
1900 :     and raise an exception in out-of-memory situations
1901 :     - unsafe extensions to cast between function pointers and pointers
1902 :     from/to ints
1903 :     - added structure C_Debug as an alternative to structure C where
1904 :     pointer-dereferencing (|*| and |*!) always check for null-pointers
1905 :     - added open_lib' to DynLinkage; open_lib' works like open_lib
1906 :     but also takes a (possibly empty) list of existing library handles
1907 :     that the current library depends on
1908 :    
1909 :     ----------------------------------------------------------------------
1910 :     Name: Matthias Blume
1911 : blume 1011 Date: 2002/01/10
1912 :     Tag: blume-20020110-newffigen
1913 :     Description:
1914 :    
1915 :     1. Updates to portable graph code.
1916 :    
1917 :     2. Major update to ml-nlffigen and ml-nlffi-lib. Things are much
1918 :     more scalable now so that even huge interfaces such as the one
1919 :     for GTK compile in finite time and space. :-)
1920 :     See src/ml-nlffigen/README for details on what's new.
1921 :    
1922 :     ----------------------------------------------------------------------
1923 : george 1003 Name: Lal George
1924 : george 1009 Date: 2001/01/09 14:31:35 EST 2002
1925 :     Tag: george-20011206-rm-native-copy
1926 :     Description:
1927 :    
1928 :     Removed the native COPY and FCOPY instructions
1929 :     from all the architectures and replaced it with the
1930 :     explicit COPY instruction from the previous commit.
1931 :    
1932 :     It is now possible to simplify many of the optimizations
1933 :     modules that manipulate copies. This has not been
1934 :     done in this change.
1935 :    
1936 :     ----------------------------------------------------------------------
1937 :     Name: Lal George
1938 : george 1003 Date: 2001/12/06 16:50:13 EST 2001
1939 :     Tag: george-20011206-mlrisc-instruction
1940 :     Description:
1941 : george 824
1942 : george 1003 Changed the representation of instructions from being fully abstract
1943 :     to being partially concrete. That is to say:
1944 :    
1945 :     from
1946 :     type instruction
1947 :    
1948 :     to
1949 :     type instr (* machine instruction *)
1950 :    
1951 :     datatype instruction =
1952 :     LIVE of {regs: C.cellset, spilled: C.cellset}
1953 :     | KILL of {regs: C.cellset, spilled: C.cellset}
1954 :     | COPYXXX of {k: CB.cellkind, dst: CB.cell list, src: CB.cell list}
1955 :     | ANNOTATION of {i: instruction, a: Annotations.annotation}
1956 :     | INSTR of instr
1957 :    
1958 :     This makes the handling of certain special instructions that appear on
1959 :     all architectures easier and uniform.
1960 :    
1961 :     LIVE and KILL say that a list of registers are live or killed at the
1962 :     program point where they appear. No spill code is generated when an
1963 :     element of the 'regs' field is spilled, but the register is moved to
1964 :     the 'spilled' (which is present, more for debugging than anything else).
1965 :    
1966 :     LIVE replaces the (now deprecated) DEFFREG instruction on the alpha.
1967 :     We used to generate:
1968 :    
1969 :     DEFFREG f1
1970 :     f1 := f2 + f3
1971 :     trapb
1972 :    
1973 :     but now generate:
1974 :    
1975 :     f1 := f2 + f3
1976 :     trapb
1977 :     LIVE {regs=[f1,f2,f3], spilled=[]}
1978 :    
1979 :     Furthermore, the DEFFREG (hack) required that all floating point instruction
1980 :     use all registers mentioned in the instruction. Therefore f1 := f2 + f3,
1981 :     defines f1 and uses [f1,f2,f3]! This hack is no longer required resulting
1982 :     in a cleaner alpha implementation. (Hopefully, intel will not get rid of
1983 :     this architecture).
1984 :    
1985 :     COPYXXX is intended to replace the parallel COPY and FCOPY available on
1986 :     all the architectures. This will result in further simplification of the
1987 :     register allocator that must be aware of them for coalescing purposes, and
1988 :     will also simplify certain aspects of the machine description that provides
1989 :     callbacks related to parallel copies.
1990 :    
1991 :     ANNOTATION should be obvious, and now INSTR represents the honest to God
1992 :     machine instruction set!
1993 :    
1994 :     The <arch>/instructions/<arch>Instr.sml files define certain utility
1995 :     functions for making porting easier -- essentially converting upper case
1996 :     to lower case. All machine instructions (of type instr) are in upper case,
1997 :     and the lower case form generates an MLRISC instruction. For example on
1998 :     the alpha we have:
1999 :    
2000 :     datatype instr =
2001 :     LDA of {r:cell, b:cell, d:operand}
2002 :     | ...
2003 :    
2004 :     val lda : {r:cell, b:cell, d:operand} -> instruction
2005 :     ...
2006 :    
2007 :     where lda is just (INSTR o LDA), etc.
2008 :    
2009 : leunga 815 ----------------------------------------------------------------------
2010 : blume 986 Name: Matthias Blume
2011 : blume 993 Date: 2001/11/22 21:40:00 EST
2012 :     Tag: Release_110_37
2013 :     Description:
2014 :    
2015 :     Release 110.37. This time for real.
2016 :    
2017 :     ----------------------------------------------------------------------
2018 :     Name: Matthias Blume
2019 : blume 988 Date: 2001/11/21 16:35:00 EST
2020 :     Tag: blume-20011121-foot-in-mouth
2021 :     Description:
2022 :    
2023 :     Removed the "Release_110_37" tag because of a serious bug.
2024 :     This will be re-tagged once the bug is fixed.
2025 :    
2026 :     ----------------------------------------------------------------------
2027 :     Name: Matthias Blume
2028 : blume 987 Date: 2001/11/21 16:14:00 EST
2029 :     Tag: blume-20011121-forgottenfile
2030 :     Description:
2031 :    
2032 :     Forgot to add a file. (Just a .tex-file -- part of
2033 :     the CM manual source.)
2034 :    
2035 :     ----------------------------------------------------------------------
2036 :     Name: Matthias Blume
2037 : blume 986 Date: 2001/11/21 16:10:00 EST
2038 : blume 988 Tag: blume-20011121-invalid_110_37
2039 : blume 986 Description:
2040 :    
2041 : blume 988 Note: I removed the original tag "Release_110_37" from this commit
2042 :     because we found a serious bug in all non-x86 backends.
2043 :     - Matthias
2044 :    
2045 : blume 986 1. Modifications to the SML/NJ code generator and to the runtime system
2046 :     so that code object name strings are directly inserted into code
2047 :     objects at code generation time. The only business the runtime system
2048 :     has with this is now to read the name strings on occasions.
2049 :     (The encoding of the name string has also changed somewhat.)
2050 :    
2051 :     2. CM now implements a simple "set calculus" for specifying export lists.
2052 :     In particular, it is now possible to refer to the export lists of
2053 :     other libraries/groups/sources and form unions as well as differences.
2054 :     See the latest CM manual for details.
2055 :    
2056 :     3. An separate notion of "proxy" libraries has again be eliminated from
2057 :     CM's model. (Proxy libraries are now simply a special case of using
2058 :     the export list calculus.)
2059 :    
2060 :     4. Some of the existing libraries now take advantage of the new set
2061 :     calculus.
2062 :     (Notice that not all libraries have been converted because some
2063 :     of the existing .cm-files are supposed to be backward compatible
2064 :     with 110.0.x.)
2065 :    
2066 :     5. Some cleanup in stand-alone programs. (Don't use "exnMessage" -- use
2067 :     "General.exnMessage"! The former relies on a certain hook to be
2068 :     initialized, and that often does not happen in the stand-alone case.)
2069 :    
2070 :     ----------------------------------------------------------------------
2071 : george 984 Name: Lal George
2072 :     Date: 2001/11/21 13:56:18 EST
2073 :     Tag: george-2001121-pseudo-ops
2074 :     Description:
2075 :    
2076 :     Implemented a complete redesign of MLRISC pseudo-ops. Now there
2077 :     ought to never be any question of incompatabilities with
2078 :     pseudo-op syntax expected by host assemblers.
2079 :    
2080 :     For now, only modules supporting GAS syntax are implemented
2081 :     but more should follow, such as MASM, and vendor assembler
2082 :     syntax, e.g. IBM as, Sun as, etc.
2083 :    
2084 :     ----------------------------------------------------------------------
2085 : blume 977 Name: Matthias Blume
2086 :     Date: 2001/11/14 11:52:00 EST
2087 :     Tag: blume-20011114-srcname
2088 :     Description:
2089 :    
2090 :     1. Routed the name of the current source file to mlriscgen where it
2091 :     should be directly emitted into the code object. (This last part
2092 :     is yet to be done.)
2093 :    
2094 :     2. Some cleanup of the pgraph code to make it match the proposal that
2095 :     I put out the other day. (The proposal notwithstanding, things are
2096 :     still in flux here.)
2097 :    
2098 :     ----------------------------------------------------------------------
2099 : george 976 Name: Lal George
2100 :     Date: 2001/11/14 09:44:04 EST
2101 :     Tag:
2102 :     Description:
2103 :    
2104 :     Fix for a backpatching bug reported by Allen.
2105 :    
2106 :     Because the boundary between short and long span-dependent
2107 :     instructions is +/- 128, there are an astounding number of
2108 :     span-dependent instructions whose size is over estimated.
2109 :    
2110 :     Allen came up with the idea of letting the size of span
2111 :     dependent instructions be non-monotonic, for a maxIter
2112 :     number of times, after which the size must be monotonically
2113 :     increasing.
2114 :    
2115 :     This table shows the number of span-dependent instructions
2116 :     whose size was over-estimated as a function of maxIter, for the
2117 :     file Parse/parse/ml.grm.sml:
2118 :    
2119 :     maxIter # of instructions:
2120 :     10 687
2121 :     20 438
2122 :     30 198
2123 :     40 0
2124 :    
2125 :     In compiling the compiler, there is no significant difference in
2126 :     compilation speed between maxIter=10 and maxIter=40. Actually,
2127 :     my measurements showed that maxIter=40 was a tad faster than
2128 :     maxIter=10! Also 96% of the files in the compiler reach a fix
2129 :     point within 13 iterations, so fixing maxIter at 40, while high,
2130 :     is okay.
2131 :    
2132 :     ----------------------------------------------------------------------
2133 : blume 975 Name: Matthias Blume
2134 :     Date: 2001/10/31 15:25:00 EST
2135 :     Tag: blume-20011031-pgraph
2136 :     Description:
2137 :    
2138 :     CKIT:
2139 :     * Changed the "Function" constructor of type Ast.ctype to carry optional
2140 :     argument identifiers.
2141 :     * Changed the return type of TypeUtil.getFunction accordingly.
2142 :     * Type equality ignores the argument names.
2143 :     * TypeUtil.composite tries to preserve argument names but gives up quickly
2144 :     if there is a mismatch.
2145 :    
2146 :     installation script:
2147 :     * attempts to use "curl" if available (unless "wget" is available as well)
2148 :    
2149 :     CM:
2150 :     * has an experimental implementation of "portable graphs" which I will
2151 :     soon propose as an implementation-independent library format
2152 :     * there are also new libraries $/pgraph.cm and $/pgraph-util.cm
2153 :    
2154 :     NLFFI-LIB:
2155 :     * some cleanup (all cosmetic)
2156 :    
2157 :     NLFFIGEN:
2158 :     * temporarily disabled the mechanism that suppresses ML output for
2159 :     C definitions whose identifiers start with an underscore character
2160 :     * generate val bindings for enum constants
2161 :     * user can request that only one style (light or heavy) is being used;
2162 :     default is to use both (command-line arguments: -heavy and -light)
2163 :     * fixed bug in handling of function types involving incomplete pointers
2164 :     * generate ML entry points that take record arguments (i.e., using
2165 :     named arguments) for C functions that have a prototype with named
2166 :     arguments
2167 :     (see changes to CKIT)
2168 :    
2169 :     ----------------------------------------------------------------------
2170 : leunga 972 Name: Allen Leung
2171 :     Date: 2001/10/27 20:34:00 EDT
2172 :     Tag: leunga-20011027-x86-fast-fp-call
2173 :     Description:
2174 :    
2175 :     Fixed the bug described in blume-20010920-slowfp.
2176 :    
2177 :     The fix involves
2178 :     1. generating FCOPYs in FSTP in ia32-svid
2179 :     2. marking a CALL with the appropriate annotation
2180 :    
2181 :     ----------------------------------------------------------------------
2182 : blume 961 Name: Matthias Blume
2183 :     Date: 2001/10/16 11:32:00 EDT
2184 :     Tag: blume-20011016-netbsd
2185 :     Description:
2186 :    
2187 :     Underscore patch from Chris Richards (fixing problem with compiling
2188 :     runtime system under recent NetBSD).
2189 :    
2190 :     ----------------------------------------------------------------------
2191 : george 959 Name: Allen Leung
2192 :     Date: 2001/10/12 17:18:32 EDT 2001
2193 :     Tag: leung-20011012-x86-printflowgraph
2194 :     Description:
2195 :    
2196 :     X86RA now uses a valid (instead of dummy) PrintFlowgraph module.
2197 :    
2198 :     ----------------------------------------------------------------------
2199 : george 952 Name: Lal George
2200 : george 958 Date: 2001/10/11 23:51:34 EDT
2201 :     Tag: george-20011011-too-many-instrs
2202 :     Description:
2203 :    
2204 :     The representation of a program point never expected to see more
2205 :     than 65536 instructions in a basic block!
2206 :    
2207 :     ----------------------------------------------------------------------
2208 :     Name: Lal George
2209 : george 952 Date: 2001/10/09 09:41:37 EDT
2210 :     Tag: george-20011008-mlrisc-labels
2211 :     Description:
2212 :    
2213 :     Changed the machine description files to support printing of
2214 :     local and global labels in assembly code, based on host assembler
2215 :     conventions.
2216 :    
2217 :     ----------------------------------------------------------------------
2218 : blume 916 Name: Matthias Blume
2219 : blume 939 Date: 2001/09/25 15:25:00 EDT
2220 :     Tag: blume-20010925-exninfo
2221 :     Description:
2222 :    
2223 :     I provided a non-hook implementation of exnName (at the toplevel) and
2224 :     made the "dummy" implementation of exnMessage (at the toplevel) more
2225 :     useful: if nothing gets "hooked in", then at least you are going to
2226 :     see the exception name and a message indicating why you don't see more.
2227 :    
2228 :     [For the time being, programs that need exnMessage and want to use
2229 :     ml-build should either use General.exnMessage (strongly recommended) or
2230 :     refer to structure General at some other point so that CM sees a
2231 :     static dependency.]
2232 :    
2233 :     [Similar remarks go for "print" and "use": If you want to use their
2234 :     functionality in stand-alone programs generated by ml-build, then use
2235 :     TextIO.output and Backend.Interact.useFile (from $smlnj/compiler.cm).]
2236 :    
2237 :     ----------------------------------------------------------------------
2238 :     Name: Matthias Blume
2239 : blume 938 Date: 2001/09/20 17:28:00 EDT
2240 :     Tag: blume-20010920-slowfp
2241 :     Description:
2242 :    
2243 :     Allen says that x86-fast-fp is not safe yet, so I turned it off again...
2244 :    
2245 :     ----------------------------------------------------------------------
2246 :     Name: Matthias Blume
2247 : blume 937 Date: 2001/09/20 17:20:00 EDT
2248 :     Tag: blume-20010920-canonicalpaths
2249 :     Description:
2250 :    
2251 :     0. Updated the BOOT file (something that I forgot to do earlier).
2252 :    
2253 :     1. Small internal change to CM so that it avoids "/../" in filenames
2254 :     as much as possible (but only where it is safe).
2255 :    
2256 :     2. Changed config/_run-sml (resulting in a changed bin/.run-sml) so
2257 :     that arguments that contain delimiters are passed through correctly.
2258 :     This change also means that all "special" arguments of the form
2259 :     @SMLxxx... must come first.
2260 :    
2261 :     3. Changed install script to put relative anchor names for tool commands
2262 :     into pathconfig.
2263 :    
2264 :     ----------------------------------------------------------------------
2265 :     Name: Matthias Blume
2266 : blume 932 Date: 2001/09/18 15:35:00 EDT
2267 :     Tag: blume-20010918-readme11036
2268 :     Description:
2269 :    
2270 :     Added README files.
2271 :    
2272 :     ----------------------------------------------------------------------
2273 :     Name: Matthias Blume
2274 : blume 929 Date: 2001/09/18 11:45:00 EDT
2275 :     Tag: Release_110_36 (retag)
2276 :     Description:
2277 :    
2278 :     Fixed mistake in config/preloads. Retagged as 110.36.
2279 :    
2280 :     ----------------------------------------------------------------------
2281 :     Name: Matthias Blume
2282 : blume 928 Date: 2001/09/18 09:40:00 EDT
2283 : blume 929 Tag: Release_110_36_orig (tag changed)
2284 : blume 928 Description:
2285 :    
2286 :     New version (110.36). New bootfiles.
2287 :    
2288 :     ----------------------------------------------------------------------
2289 :     Name: Matthias Blume
2290 : blume 927 Date: 2001/09/14 16:15:00 EDT
2291 :     Tag: blume-20010914-x86fastfp
2292 :     Description:
2293 :    
2294 :     John committed some changes that Allen made, in particular a (hopefully)
2295 :     correctly working version of the x86-fp module.
2296 :    
2297 :     I changed the default setting of the Control.MLRISC.getFlag "x86-fast-fp"
2298 :     flag to "true". Everything seems to compile to a fixpoint ok, and
2299 :     "mandelbrot" speeds up by about 15%.
2300 :    
2301 :     ----------------------------------------------------------------------
2302 :     Name: Matthias Blume
2303 : blume 923 Date: 2001/09/13 11:20:00 EDT
2304 :     Tag: blume-20010913-minimal
2305 :     Description:
2306 :    
2307 :     1. Stefan Monnier's patch to fix a miscompilation problem that
2308 :     was brought to light by John Reppy's work on Moby.
2309 :    
2310 :     2. Implemented a minimal "structure Compiler" that contains just
2311 :     "version" and "architecture". The minimal version will be
2312 :     available when the full version is not. This is for backward-
2313 :     compatibility with code that wants to test Compiler.version.
2314 :    
2315 :     ----------------------------------------------------------------------
2316 :     Name: Matthias Blume
2317 : blume 920 Date: 2001/08/28 14:03:00 EDT
2318 :     Tag: blume-20010828-ml-lex
2319 :     Description:
2320 :    
2321 :     Fix for bug 1581, received from Neophytos Michael.
2322 :    
2323 :     ----------------------------------------------------------------------
2324 :     Name: Matthias Blume
2325 : blume 918 Date: 2001/08/27 11:20:00 EDT
2326 :     Tag: blume-20010827-readme11035
2327 :     Description:
2328 :    
2329 :     Fleshed out the README file for 110.35.
2330 :    
2331 :     ----------------------------------------------------------------------
2332 :     Name: Matthias Blume
2333 : blume 916 Date: 2001/08/24 17:10:00 EDT
2334 :     Tag: Release_110_35
2335 :     Description:
2336 :    
2337 :     New version number (110.35). New bootfiles.
2338 :    
2339 :     ----------------------------------------------------------------------
2340 : george 915 Name: Lal George
2341 : george 909 Date: 2001/08/24 13:47:18 EDT 2001
2342 :     Tag: george-20010824-MLRISC-graphs
2343 :     Description:
2344 :    
2345 :     removed clusters from MLRISC completely and replaced with graphs.
2346 :    
2347 :     ----------------------------------------------------------------------
2348 :     Name: Matthias Blume
2349 : blume 905 Date: 2001/08/23 17:50:00 EDT
2350 :     Tag: blume-20010823-toplevel
2351 :     Description:
2352 :    
2353 :     - some reorganization of the code that implements various kinds of
2354 :     environments in the compiler (static, dynamic, symbolic, combined)
2355 :     - re-implemented the EnvRef module so that evalStream works properly
2356 :     (if the stream contains references to "use", "CM.make", etc.)
2357 :     - cleaned up evalloop.sml and interact.sml (but they need more cleaning)
2358 :    
2359 :     ----------------------------------------------------------------------
2360 :     Name: Matthias Blume
2361 : blume 904 Date: 2001/08/20 15:50 EDT
2362 :     Tag: blume20010820-slipup
2363 :     Description:
2364 :    
2365 :     I forgot to commit a few files. Here they are...
2366 :    
2367 :     ----------------------------------------------------------------------
2368 :     Name: Matthias Blume
2369 : blume 903 Date: 2001/08/20 15:35:00 EDT
2370 :     Tag: blume-20010820-debugprof
2371 :     Description:
2372 :    
2373 :     !!!! NEW BOOTFILES !!!!
2374 :    
2375 :     This is another round of reorganizing the compiler sources. This
2376 :     time the main goal was to factor out all the "instrumentation"
2377 :     passes (for profiling and backtracing) into their own library.
2378 :     The difficulty was to do it in such a way that it does not depend
2379 :     on elaborate.cm but only on elabdata.cm.
2380 :    
2381 :     Therefore there have been further changes to both elaborate.cm and
2382 :     elabdata.cm -- more "generic" things have been moved from the former
2383 :     to the latter. As a result, I was forced to split the assignment
2384 :     of numbers indicating "primtyc"s into two portions: SML-generic and
2385 :     SML/NJ-specific. Since it would have been awkward to maintain,
2386 :     I bit the bullet and actually _changed_ the mapping between these
2387 :     numbers and primtycs. The bottom line of this is that you need
2388 :     a new set of bin- and bootfiles.
2389 :    
2390 :     I have built new bootfiles for all architectures, so doing a fresh
2391 :     checkout and config/install.sh should be all you need.
2392 :    
2393 :     The newly created library's name is
2394 :    
2395 :     $smlnj/viscomp/debugprof.cm
2396 :    
2397 :     and its sources live under
2398 :    
2399 :     src/compiler/DebugProf
2400 :    
2401 :     ----------------------------------------------------------------------
2402 :     Name: Matthias Blume
2403 : blume 902 Date: 2001/08/15 17:15:00 EDT
2404 :     Tag: blume-20010815-compreorg
2405 :     Description:
2406 :    
2407 :     This is a first cut at reorganizing the CM libraries that make up the
2408 :     core of the compiler. The idea is to separate out pieces that could
2409 :     be used independently by tools, e.g., the parser, the typechecker, etc.
2410 :    
2411 :     The current status is a step in this direction, but it is not quite
2412 :     satisfactory yet. Expect more changes in the future.
2413 :    
2414 :     Here is the current (new) organization...
2415 :    
2416 :     What used to be $smlnj/viscomp/core.cm is now divided into
2417 :     six CM libraries:
2418 :    
2419 :     $smlnj/viscomp/basics.cm
2420 :     /parser.cm
2421 :     /elabdata.cm
2422 :     /elaborate.cm
2423 :     /execute.cm
2424 :     /core.cm
2425 :    
2426 :     The CM files for these libraries live under src/system/smlnj/viscomp.
2427 :     All these libraries are proxy libraries that contain precisely
2428 :     one CM library component. Here are the locations of the components
2429 :     (all within the src/compiler tree):
2430 :    
2431 :     Basics/basics.cm
2432 :     Parse/parser.cm
2433 :     ElabData/elabdata.cm
2434 :     Elaborator/elaborate.cm
2435 :     Execution/execute.cm
2436 :     core.cm
2437 :    
2438 :     [This organization is the same that has been used already
2439 :     for a while for the architecture-specific parts of the visible
2440 :     compiler and for the old version of core.cm.]
2441 :    
2442 :     As you will notice, many source files have been moved from their
2443 :     respective original locations to a new home in one of the above
2444 :     subtrees.
2445 :    
2446 :     The division of labor between the new libraries is the following:
2447 :    
2448 :     basics.cm:
2449 :     - Simple, basic definitions that pertain to many (or all) of
2450 :     the other libraries.
2451 :     parser.cm:
2452 :     - The SML parser, producing output of type Ast.dec.
2453 :     - The type family for Ast is also defined and exported here.
2454 :     elabdata.cm:
2455 :     - The datatypes that describe input and output of the elaborator.
2456 :     This includes types, absyn, and static environments.
2457 :     elaborator.cm:
2458 :     - The SML/NJ type checker and elaborator.
2459 :     This maps an Ast.dec (with a given static environment) to
2460 :     an Absyn.dec (with a new static environment).
2461 :     - This libraries implements certain modules that used to be
2462 :     structures as functors (to remove dependencies on FLINT).
2463 :     execute.cm:
2464 :     - Everything having to do with executing binary code objects.
2465 :     - Dynamic environments.
2466 :     core.cm:
2467 :     - SML/NJ-specific instantiations of the elaborator and MLRISC.
2468 :     - Top-level modules.
2469 :     - FLINT (this should eventually become its own library)
2470 :    
2471 :     Notes:
2472 :    
2473 :     I am not 100% happy with the way I separated the elaborator (and its
2474 :     data structures) from FLINT. Two instances of the same problem:
2475 :    
2476 :     1. Data structures contain certain fields that carry FLINT-specific
2477 :     information. I hacked around this using exn and the property list
2478 :     module from smlnj-lib. But the fact that there are middle-end
2479 :     specific fields around at all is a bit annoying.
2480 :    
2481 :     2. The elaborator calculates certain FLINT-related information. I tried
2482 :     to make this as abstract as I could using functorization, but, again,
2483 :     the fact that the elaborator has to perform calculations on behalf
2484 :     of the middle-end at all is not nice.
2485 :    
2486 :     3. Having to used exn and property lists is unfortunate because it
2487 :     weakens type checking. The other alternative (parameterizing
2488 :     nearly *everything*) is not appealing, though.
2489 :    
2490 :     I removed the "rebinding =" warning hack because due to the new organization
2491 :     it was awkward to maintain it. As a result, the compiler now issues some of
2492 :     these warnings when compiling init.cmi during bootstrap compilation. On
2493 :     the plus side, you also get a warning when you do, for example:
2494 :     val op = = Int32.+
2495 :     which was not the case up to now.
2496 :    
2497 :     I placed "assign" and "deref" into the _Core structure so that the
2498 :     code that deals with the "lazy" keyword can find them there. This
2499 :     removes the need for having access to the primitive environment
2500 :     during elaboration.
2501 :    
2502 :     ----------------------------------------------------------------------
2503 :     Name: Matthias Blume
2504 : blume 898 Date: 2001/08/13
2505 :     Tag: blume-20010813-closures
2506 :     Description:
2507 :    
2508 :     This fix was sent to us by Zhong Shao. It is supposed to improve the
2509 :     performance of certain loops by avoiding needless closure allocation.
2510 :    
2511 :     ----------------------------------------------------------------------
2512 : george 890 Name: Lal George
2513 : george 896 Date: 2001/07/31 10:03:23 EDT 2001
2514 :     Tag: george-20010731-x86-fmalloc
2515 :     Description: Fixed bug in x86 calls
2516 :    
2517 :     There was a bug where call instructions would mysteriously
2518 :     vanish. The call instruction had to be one that returned
2519 :     a floating point value.
2520 :    
2521 :     ----------------------------------------------------------------------
2522 :     Name: Lal George
2523 : george 890 Date: 2001/07/19 16:36:29 EDT 2001
2524 :     Tag: george-20010719-simple-cells
2525 :     Description:
2526 :    
2527 :     I have dramatically simplified the interface for CELLS in MLRISC.
2528 :    
2529 :     In summary, the cells interface is broken up into three parts:
2530 :    
2531 :     1. CellsBasis : CELLS_BASIS
2532 :    
2533 :     CellsBasis is a top level structure and common for all
2534 :     architectures. it contains the definitions of basic datatypes
2535 :     and utility functions over these types.
2536 :    
2537 :     2. functor Cells() : CELLS
2538 :    
2539 :     Cells generates an interface for CELLS that incorporates the
2540 :     specific resources on the target architecture, such as the
2541 :     presence of special register classes, their number and size,
2542 :     and various useful substructures.
2543 :    
2544 :     3. <ARCH>CELLS
2545 :    
2546 :     e.g. SparcCells: SPARCCELLS
2547 :    
2548 :     <ARCH>CELLS usually contains additional bindings for special
2549 :     registers on the architecture, such as:
2550 :    
2551 :     val r0 : cell (* register zero *)
2552 :     val y : cell (* Y register *)
2553 :     val psr : cell (* processor status register *)
2554 :     ...
2555 :    
2556 :     The structure returned by applying the Cells functor is opened
2557 :     in this interface.
2558 :    
2559 :     The main implication of all this is that the datatypes for cells is
2560 :     split between CellsBasis and CELLS -- a fairly simple change for user
2561 :     code.
2562 :    
2563 :     In the old scheme the CELLS interface had a definitional binding of
2564 :     the form:
2565 :    
2566 :     signature CELLS = sig
2567 :    
2568 :     structure CellsBasis = CellsBasis
2569 :    
2570 :     ...
2571 :    
2572 :     end
2573 :    
2574 :     With all the sharing constraints that goes on in MLRISC, this old
2575 :     design quickly leads to errors such as:
2576 :    
2577 :     "structure definition spec inside of sharing ... "
2578 :    
2579 :    
2580 :     and appears to require an unacceptable amount of sharing and where
2581 :     constraint hackery.
2582 :    
2583 :     I think this error message (the interaction of definitional specs and
2584 :     sharing) requires more explanation on our web page.
2585 :    
2586 :     ----------------------------------------------------------------------
2587 : blume 826 Name: Matthias Blume
2588 : blume 879 Date: 2001/07/19 15:00:00 EDT
2589 :     Tag: blume-20010719-libreorg
2590 :     Description:
2591 :    
2592 :     This update puts together a fairly extensive but straightforward change
2593 :     to the way the libraries that implement the interactive system are
2594 :     organized:
2595 :    
2596 :     The biggest change is the elimination of structure Compiler. As a
2597 :     replacement for this structure, there is now a CM library
2598 :     (known as $smlnj/compiler.cm or $smlnj/compiler/current.cm)
2599 :     that exports all the substructures of the original structure Compiler
2600 :     directly. So instead of saying Compiler.Foo.bar one now simply
2601 :     says Foo.bar. (The CM libraries actually export a collection of
2602 :     structures that is richer than the collection of substructures of
2603 :     structure Compiler.)
2604 :    
2605 :     To make the transition smooth, there is a separate library called
2606 :     $smlnj/compiler/compiler.cm which puts together and exports the
2607 :     original structure Compiler (or at least something very close to it).
2608 :    
2609 :     There are five members of the original structure Compiler
2610 :     that are not exported directly but which instead became members
2611 :     of a new structure Backend (described by signature BACKEND). These are:
2612 :     structure Profile (: PROFILE), structure Compile (: COMPILE), structure
2613 :     Interact (: INTERACT), structure Machine (: MACHINE), and val
2614 :     architecture (: string).
2615 :    
2616 :     Structure Compiler.Version has become structure CompilerVersion.
2617 :    
2618 :     Cross-compilers for alpha32, hppa, ppc, sparc, and x86 are provided
2619 :     by $smlnj/compiler/<arch>.cm where <arch> is alpha32, hppa, ppc, sparc,
2620 :     or x86, respectively.
2621 :     Each of these exports the same frontend structures that
2622 :     $smlnj/compiler.cm exports. But they do not have a structure Backend
2623 :     and instead export some structure <Arch>Backend where <Arch> is Alpha32,
2624 :     Hppa, PPC, Sparc, or X86, respectively.
2625 :    
2626 :     Library $smlnj/compiler/all.cm exports the union of the exports of
2627 :     $smlnj/compiler/<arch>.cm
2628 :    
2629 :     There are no structures <Arch>Compiler anymore, use
2630 :     $smlnj/compiler/<arch>.cm instead.
2631 :    
2632 :     Library host-compiler-0.cm is gone. Instead, the internal library
2633 :     that instantiates CM is now called cm0.cm. Selection of the host
2634 :     compiler (backend) is no longer done here but. (Responsibility for it
2635 :     now lies with $smlnj/compiler/current.cm. This seems to be more
2636 :     logical.)
2637 :    
2638 :     Many individual files have been moved or renamed. Some files have
2639 :     been split into multiple files, and some "dead" files have been deleted.
2640 :    
2641 :     Aside from these changes to library organization, there are also changes
2642 :     to the way the code itself is organized:
2643 :    
2644 :     Structure Binfile has been re-implemented in such a way that it no
2645 :     longer needs any knowledge of the compiler. It exclusively deals
2646 :     with the details of binfile layout. It no longer invokes the
2647 :     compiler (for the purpose of creating new prospective binfile
2648 :     content), and it no longer has any knowledge of how to interpret
2649 :     pickles.
2650 :    
2651 :     Structure Compile (: COMPILE) has been stripped down to the bare
2652 :     essentials of compilation. It no longer deals with linking/execution.
2653 :     The interface has been cleaned up considerably.
2654 :    
2655 :     Utility routines for dealing with linking and execution have been
2656 :     moved into their own substructures.
2657 :    
2658 :     (The ultimate goal of these changes is to provide a light-weight
2659 :     binfile loader/linker (at least for, e.g., stable libraries) that
2660 :     does not require CM or the compiler to be present.)
2661 :    
2662 :     CM documentation has been updated to reflect the changes to library
2663 :     organization.
2664 :    
2665 :     ----------------------------------------------------------------------
2666 :     Name: Matthias Blume
2667 : blume 875 Date: 2001/07/10 17:30:00 EDT
2668 :     Tag: Release_110_34
2669 :     Description:
2670 :    
2671 : blume 876 Minor tweak to 110.34 (re-tagged):
2672 :    
2673 :     - README.html file added to CVS repository
2674 :     - runtime compiles properly under FreeBSD 3.X and 4.X
2675 :    
2676 :     ----------------------------------------------------------------------
2677 :     Name: Matthias Blume
2678 :     Date: 2001/07/10 17:30:00 EDT
2679 :     Tag: Release_110_34
2680 :     Description:
2681 :    
2682 : blume 875 New version number (110.34). New bootfiles.
2683 :    
2684 :     ----------------------------------------------------------------------
2685 :     Name: Matthias Blume
2686 : blume 874 Date: 2001/07/09 16:00:00 EDT
2687 :     Tag: blume-20010709-more-varargs
2688 :     Description:
2689 :    
2690 :     I changed the handling of varargs in ml-nlffigen again:
2691 :     The ellipsis ... will now simply be ignored (with an accompanying warning).
2692 :    
2693 :     The immediate effect is that you can actually call a varargs function
2694 :     from ML -- but you can't actually supply any arguments beyond the ones
2695 :     specified explicitly. (For example, you can call printf with its format
2696 :     string, but you cannot pass additional arguments.)
2697 :    
2698 :     This behavior is only marginally more useful than the one before, but
2699 :     it has the advantage that a function or, more importantly, a function
2700 :     type never gets dropped on the floor, thus avoiding follow-up problems with
2701 :     other types that refer to the offending one.
2702 :    
2703 :     ----------------------------------------------------------------------
2704 :     Name: Matthias Blume
2705 : blume 873 Date: 2001/07/09 11:25:00 EDT
2706 :     Tag: blume-20010709-varargs
2707 :     Description:
2708 :    
2709 :     1. ckit-lib.cm now exports structure Error
2710 :     2. ml-nlffigen reports occurences of "..." (i.e., varargs function types)
2711 :     with a warning accompanied by a source location. Moreover, it
2712 :     merely skips the offending function or type and proceeds with the
2713 :     rest of its work.u As a result, one can safely feed C code containing
2714 :     "..." to ml-nlffigen.
2715 :     3. There are some internal improvements to CM, providing slightly
2716 :     more general string substitutions in the tools subsystem.
2717 :    
2718 :     ----------------------------------------------------------------------
2719 :     Name: Matthias Blume
2720 : blume 854 Date: 2001/06/27 15:10:00 EDT
2721 :     Tag: blume-20010627-concur
2722 :     Description:
2723 :    
2724 :     Fixed a small bug in CM's handling of parallel compilation.
2725 :     (You could observe the bug by Control-C-interrupting an ordinary
2726 :     CMB.make or CM.stabilize and then attaching some compile servers.
2727 :     The result was that all of a sudden the previously interrupted
2728 :     compilation would continue on its own. This was because of
2729 :     an over-optimization: CM did not bother to clean out certain queues
2730 :     when no servers were attached "anyway", resulting in the contents
2731 :     of these queues to grab control when new servers did get attached.)
2732 :    
2733 :     There is also another minor update to the CM manual.
2734 :    
2735 :     ----------------------------------------------------------------------
2736 :     Name: Matthias Blume
2737 : blume 853 Date: 2001/06/26 16:15:00 EDT
2738 :     Tag: blume-20010626-cmdoc
2739 :     Description:
2740 :    
2741 :     Minor typo fixed in CM manual (syntax diagram for libraries).
2742 :    
2743 :     ----------------------------------------------------------------------
2744 :     Name: Matthias Blume
2745 : blume 852 Date: 2001/06/25 22:55:00 EDT
2746 :     Tag: blume-20010625-x86pc
2747 :     Description:
2748 :    
2749 :     Fixed a nasty bug in the X86 assembly code that caused signal
2750 :     handlers to fail (crash) randomly.
2751 :    
2752 :     ----------------------------------------------------------------------
2753 :     Name: Matthias Blume
2754 : blume 846 Date: 2001/06/25 12:05:00 EDT
2755 :     Tag: blume-20010625-nlffigen
2756 :     Description:
2757 :    
2758 :     This update fixes a number of minor bugs in ml-nlffigen as reported by
2759 :     Nick Carter <nbc@andrew.cmu.edu>.
2760 :    
2761 :     1. Silly but ok typedefs of the form "typedef void myvoid;" are now accepted.
2762 :     2. Default names for generated files are now derived from the name of
2763 :     the C file *without its directory*. In particular, this causes generated
2764 :     files to be placed locally even if the C file is in some system directory.
2765 :     3. Default names for generated signatures and structures are also derived
2766 :     from the C file name without its directory. This avoids silly things
2767 :     like "structure GL/GL".
2768 :     (Other silly names are still possible because ml-nlffigen does not do
2769 : blume 847 a thorough check of whether generated names are legal ML identifiers.
2770 :     When in doubt, use command line arguments to force particular names.)
2771 : blume 846
2772 :     ----------------------------------------------------------------------
2773 :     Name: Matthias Blume
2774 : blume 845 Date: 2001/06/21 12:25:00 EDT
2775 :     Tag: blume-20010621-eXene
2776 :     Description:
2777 :    
2778 :     eXene now compiles and (sort of) works again.
2779 :    
2780 :     The library name (for version > 110.33) is $/eXene.cm.
2781 :    
2782 :     I also added an new example in src/eXene/examples/nbody. See the
2783 :     README file there for details.
2784 :    
2785 :     ----------------------------------------------------------------------
2786 :     Name: Matthias Blume
2787 : blume 844 Date: 2001/06/20 16:40:00 EDT
2788 :     Tag: blume-20010620-cml
2789 :     Description:
2790 :    
2791 :     CML now compiles and works again.
2792 :    
2793 :     Libraries (for version > 110.33):
2794 :    
2795 :     $cml/cml.cm Main CML library.
2796 :     $cml/basis.cm CML's version of $/basis.cm.
2797 :     $cml/cml-internal.cm Internal helper library.
2798 :     $cml/core-cml.cm Internal helper library.
2799 :     $cml-lib/trace-cml.cm Tracing facility.
2800 :     $cml-lib/smlnj-lib.cm CML's version of $/smlnj-lib.cm
2801 :    
2802 :     The installer (config/install.sh) has been taught how to properly
2803 :     install this stuff.
2804 :    
2805 :     ----------------------------------------------------------------------
2806 :     Name: Matthias Blume
2807 : blume 843 Date: 2001/06/19 17:55:00 EDT
2808 :     Tag: blume-20010619-instantiate
2809 :     Description:
2810 :    
2811 :     This un-breaks the fix for bug 1432.
2812 :     (The bug was originally fixed in 110.9 but I broke it again some
2813 :     time after that.)
2814 :    
2815 :     ----------------------------------------------------------------------
2816 :     Name: Matthias Blume
2817 : blume 842 Date: 2001/06/19 17:25:00 EDT
2818 :     Tag: blume-20010619-signals
2819 :     Description:
2820 :    
2821 :     This should (hopefully) fix the long-standing signal handling bug.
2822 :     (The runtime system was constructing a continuation record with an
2823 :     incorrect descriptor which would cause the GC to drop data on the floor...)
2824 :    
2825 :     ----------------------------------------------------------------------
2826 :     Name: Matthias Blume
2827 : blume 840 Date: 2001/06/15 15:05:00 EDT
2828 : blume 841 Tag: blume-20010615-moresparc
2829 :     Description:
2830 :    
2831 :     Here is a short late-hour update related to Sparc c-calls:
2832 :    
2833 :     -- made handling of double-word arguments a bit smarter
2834 :    
2835 :     -- instruction selection phase tries to collapse certain clumsily
2836 :     constructed ML-Trees; typical example:
2837 :    
2838 :     ADD(ty,ADD(_,e,LI d1),LI d2) -> ADD(ty,e,LI(d1+d2))
2839 :    
2840 :     This currently has no further impact on SML/NJ since mlriscGen does
2841 :     not seem to generate such patterns in the first place, and c-calls
2842 :     (which did generate them in the beginning) has meanwhile been fixed
2843 :     so as to avoid them as well.
2844 :    
2845 :     ----------------------------------------------------------------------
2846 :     Name: Matthias Blume
2847 :     Date: 2001/06/15 15:05:00 EDT
2848 : blume 840 Tag: blume-20010615-sparc
2849 :     Description:
2850 :    
2851 :     The purpose of this update is to provide an implementation of NLFFI
2852 :     on Sparc machines.
2853 :    
2854 :     Here are the changes in detail:
2855 :    
2856 :     * src/MLRISC/sparc/c-calls/sparc-c-calls.sml is a new file containing
2857 :     the Sparc implementation of the c-calls API.
2858 :     * The Sparc backend of SML/NJ has been modified to uniformely use %fp
2859 :     for accessing the ML frame. Thus, we have a real frame pointer and
2860 :     can freely modify %sp without need for an omit-frame-ptr phase.
2861 :     The vfp logic in src/compiler/CodeGen/* has been changed to accomodate
2862 :     this case.
2863 :     * ml-nlffigen has been taught to produce code for different architectures
2864 :     and calling conventions.
2865 :     * In a way similar to what was done in the x86 case, the Sparc
2866 :     backend uses its own specific extension to mltree. (For example,
2867 :     it needs to be able to generate UNIMP instructions which are part
2868 :     of the calling convention.)
2869 :     * ml-nlffi-lib was reorganized to make it more modular (in particular,
2870 :     to make it easier to plug in new machine- and os-dependent parts).
2871 :    
2872 :     There are some other fairly unrelated bug fixes and cleanups as well:
2873 :    
2874 :     * I further hacked the .cm files for MLRISC tools (like MDLGen) so
2875 :     that they properly share their libraries with existing SML/NJ libraries.
2876 :     * I fixed a minor cosmetic bug in CM, supressing certain spurious
2877 :     follow-up error messages.
2878 :     * Updates to CM/CMB documentation.
2879 :    
2880 :     TODO items:
2881 :    
2882 :     * MLRISC should use a different register as its asmTemp on the Sparc.
2883 :     (The current %o2 is a really bad choice because it is part of the
2884 :     calling conventions, so things might interfere in unexpected ways.)
2885 :    
2886 :     ----------------------------------------------------------------------
2887 :     Name: Matthias Blume
2888 : blume 839 Date: 2001/06/07
2889 :     Tag: blume-20010607-calls
2890 :     Description:
2891 :    
2892 :     A number of internal changes related to C calls and calling conventions:
2893 :    
2894 :     1. ML-Tree CALL statements now carry a "pops" field. It indicates the
2895 :     number of bytes popped implicitly (by the callee). In most cases
2896 :     this field is 0 but on x86/win32 it is some non-zero value. This
2897 :     is information provided for the benefit of the "omit-frameptr" pass.
2898 :     2. The CALL instruction on the x86 carries a similar "pops" field.
2899 :     The instruction selection phase copies its value from the ML-Tree
2900 :     CALL statement.
2901 :     3. On all other architectures, the instruction selection phase checks
2902 :     whether "pops=0" and complains if not.
2903 :     4. The c-calls implementation for x86 now accepts two calling conventions:
2904 :     "ccall" and "stdcall". When "ccall" is selected, the caller cleans
2905 :     up after the call and pops is set to 0. For "stdcall", the caller
2906 :     does nothing, leaving the cleanup to the callee; pops is set to
2907 :     the number of bytes that were pushed onto the stack.
2908 :     5. The cproto decoder (compiler/Semant/types/cproto.sml) now can
2909 :     distinguish between "ccall" and "stdcall".
2910 :     6. The UNIMP instruction has been added to the supported Sparc instruction
2911 :     set. (This is needed for implementing the official C calling convention
2912 :     on this architecture.)
2913 :     7. I fixed some of the .cm files under src/MLRISC/Tools to make them
2914 :     work with the latest CM.
2915 :    
2916 :     ----------------------------------------------------------------------
2917 :     Name: Matthias Blume
2918 : blume 838 Date: 2001/06/05 15:10:00 EDT
2919 :     Tag: blume-20010605-cm-index
2920 :     Description:
2921 :    
2922 :     0. The "lambdasplit" parameter for class "sml" in CM has been documented.
2923 :    
2924 :     1. CM can now generate "index files". These are human-readable files
2925 :     that list on a per-.cm-file basis each toplevel symbol defined or
2926 :     imported. The location of the index file for
2927 :     <p>/<d>.cm is <p>/CM/INDEX/<d>.cm.
2928 :     To enable index-file generation, set CM.Control.generate_index to true
2929 :     or export an environment-symbol: export CM_GENERATE_INDEX=true.
2930 :    
2931 :     The CM manual has been updated accordingly.
2932 :    
2933 :     2. I made some slight modifications to the c-calls API in MLRISC.
2934 :    
2935 :     a) There is now a callback to support saving/restoring of
2936 :     dedicated but caller-save registers around the actual call
2937 :     instruction.
2938 :     b) One can optionally specify a comment-annotation for the
2939 :     call instruction.
2940 :    
2941 :     3. SML/NJ (mlriscGen.sml) uses this new API for the rawccall primop.
2942 :     (For example, the comment annotation shows the C prototype of
2943 :     the function being called.)
2944 :    
2945 :     ----------------------------------------------------------------------
2946 :     Name: Matthias Blume
2947 : blume 837 Date: 2001/06/01 13:30:00 EDT
2948 :     Tag: blume-20010601-nlffi-cleanup
2949 :     Description:
2950 :    
2951 :     This is mostly a cleanup of MLFFI stuff:
2952 :    
2953 :     - some signature files have been put into a more exposed place
2954 :     - the ugly 'f type parameter is gone (simplifies types tremendously!)
2955 :     - ml-nlffigen changed accordingly
2956 :     - tutorial updated
2957 :    
2958 :     Other changes:
2959 :    
2960 :     - author's affiliation in CM manual(s) updated
2961 :     - some more recognized keywords added to Allen's sml.sty
2962 :    
2963 :     ----------------------------------------------------------------------
2964 :     Name: Matthias Blume
2965 : blume 836 Date: 2001/05/25 15:30:00 EDT
2966 :     Tag: blume-20010525-iptr
2967 :     Description:
2968 :    
2969 :     - put the official 110.33-README (as it appears on the ftp server) under
2970 :     CVS
2971 :     - fixed a small bug related to incomplete pointer types in
2972 :     ml-nlffigen
2973 :     - small cosmetic change to the ml-nlffi-lib's "arr" type constructor
2974 :     (it does not need the 'f type parameter)
2975 :    
2976 :     ----------------------------------------------------------------------
2977 :     Name: Matthias Blume
2978 : blume 834 Date: 2001/05/23 14:30:00 EDT
2979 :     Tag: Release_110_33
2980 :     Description:
2981 :    
2982 :     New version number (110.33). New bootfiles.
2983 :    
2984 :     ----------------------------------------------------------------------
2985 :     Name: Matthias Blume
2986 : blume 833 Date: 2001/05/22 18:06:00 EDT
2987 :     Tag: blume-20010522-targets
2988 :     Description:
2989 :    
2990 :     Made install.sh use file config/targets.customized if it exists, falling
2991 :     back to config/targets if it doesn't. This way one can have a customized
2992 :     version of the targets file without touching the "real thing", thus
2993 :     eliminating the constant fear of accidentally checking something bogus
2994 :     back into the CVS repository... (File config/targets.customized must
2995 :     not be added to the repository!)
2996 :    
2997 :     ----------------------------------------------------------------------
2998 :     Name: Matthias Blume
2999 : blume 832 Date: 2001/05/22 16:30:00 EDT
3000 :     Tag: blume-20010522-minitut
3001 :     Description:
3002 :    
3003 :     1. Bug fix in ml-nlffigen; now (hopefully) correctly handling
3004 :     struct returns.
3005 :     2. Added src/ml-nlffi-lib/Doc/mini-tutorial.txt. This is some very
3006 :     incomplete, preliminary documentation for NLFFI.
3007 :    
3008 :     ----------------------------------------------------------------------
3009 :     Name: Matthias Blume
3010 : blume 829 Date: 2001/05/14 11:30:00 EDT
3011 :     Tag: blume-20010514-script
3012 :     Description:
3013 :    
3014 :     Some bugs in install script fixed.
3015 :    
3016 :     In addition to that I also made a slight change to the NLFFI API:
3017 :     Functors generated by ml-nlffigen now take the dynamic library as a
3018 :     straight functor argument, not as a suspended one. (The original
3019 :     functor code used to force the suspension right away anyway, so there
3020 :     was nothing gained by this complication of the interface.)
3021 :    
3022 :     ----------------------------------------------------------------------
3023 :     Name: Matthias Blume
3024 : blume 828 Date: 2001/05/11 14:35:00 EDT
3025 :     Tag: blume-20010511-ml-nlffi
3026 :     Description:
3027 :    
3028 :     I finally took the plunge and added my new FFI code to the main
3029 :     repository. For x86-linux it is now ready for prime-time.
3030 :    
3031 :     There are two new subdirectories of "src":
3032 :    
3033 :     - ml-nlffi-lib:
3034 :     The utility library for programs using the FFI interface.
3035 :     Here is the implementation of $/c.cm and its associated low-level
3036 :     partners $/c-int.cm and $/memory.cm.
3037 :     - ml-nlffigen:
3038 :     A stand-alone program for generating ML glue code from C source
3039 :     code.
3040 :    
3041 :     Building ml-nlffigen requires $/ckit-lib.cm.
3042 :    
3043 :     The config/install.sh script has been updates to do the Right Thing
3044 :     (hopefully).
3045 :    
3046 :     Notice that the source tree for the C-Kit will not be put under "src"
3047 :     but directly under the installation root directory. (This is the
3048 :     structure that currently exists on the CVS server when you check out
3049 :     module "sml".) Fortunately, config/install.sh knows about this oddity.
3050 :    
3051 :     Bugs: No documentation yet.
3052 :    
3053 :     ----------------------------------------------------------------------
3054 :     Name: Matthias Blume
3055 : blume 826 Date: 2001/05/09 16:35:00 EDT
3056 :     Tag: blume-20010509-cpscontract
3057 :     Description:
3058 :    
3059 :     Fixed a bug in the accounting code in cpsopt/contract.sml. (The
3060 :     wrapper/unwrapper elimination did not decrement usage counts and some
3061 :     dead variables got overlooked by the dead-up logic.)
3062 :    
3063 :     ----------------------------------------------------------------------
3064 : george 824 Name: Lal George
3065 :     Date: 2001/05/08 17:26:09 EDT
3066 :     Tag: george-20010508-omit-frameptr
3067 :     Description:
3068 :    
3069 :     Changes to implement the omit-frame-pointer optimization to support
3070 :     raw C calls. For now, there is only support on the Intel x86, but
3071 :     other architectures will follow as more experience is gained with this.
3072 :    
3073 :    
3074 :     ----------------------------------------------------------------------
3075 : blume 818 Name: Matthias Blume
3076 : blume 819 Date: 2001/05/07 14:40:00 EDT
3077 :     Tag: blume-20010507-proxies
3078 :     Description:
3079 :    
3080 :     I made into "proxy libraries" all libraries that qualify for such a
3081 :     change. (A qualifying library is a library that has another library or
3082 :     groups as its sole member and repeats that member's export list
3083 :     verbatim. A proxy library avoids this repetition by omitting its export
3084 :     list, effectively inheriting the list that its (only) member exports.
3085 :     See the CM manual for more explanation.)
3086 :     The main effect is that explicit export lists for these libraries
3087 :     do not have to be kepts in sync, making maintenance a bit easier.
3088 :    
3089 :     I also added copyright notices to many .cm-files.
3090 :    
3091 :     Last but not least, I made a new set of bootfiles.
3092 :    
3093 :     ----------------------------------------------------------------------
3094 :     Name: Matthias Blume
3095 : blume 818 Date: 2001/05/04 17:00:00 EDT
3096 :     Tag: blume-20010504-cm-lsplit
3097 :     Description:
3098 :    
3099 :     0. John merged pending changes to $/smlnj-lib.cm
3100 :    
3101 :     1. Allen's previous change accidentally backed out of one of Lal's
3102 :     earlier changes. I undid this mistake (re-introducing Lal's change).
3103 :    
3104 :     2. I used the new topOrder' function from graph-scc.sml (from $/smlnj-lib.cm)
3105 :     within the compiler where applicable. There is some code simplification
3106 :     because of that.
3107 :    
3108 :     3. The "split" phase (in FLINT) is now part of the default list of phases.
3109 :     Compiler.Control.LambdaSplitting.* can be used to globally control the
3110 :     lambda-splitting (cross-module-inlining) engine. In addition to that,
3111 :     it can now also be controlled on a per-source basis: CM has been taught
3112 :     a new tool parameter applicable to ML source files.
3113 :    
3114 :     - To turn lambda-splitting off completely:
3115 :     local open Compiler.Control.LambdaSplitting in
3116 :     val _ = set Off
3117 :     end
3118 :     - To make "no lambda-splitting" the global default (but allow per-source
3119 :     overriding); this is the initial setting:
3120 :     local open Compiler.Control.LambdaSplitting in
3121 :     val _ = set (Default NONE)
3122 :     end
3123 :     - To make "lambda-splitting with aggressiveness a" the global default
3124 :     (and allow per-source overriding):
3125 :     local open Compiler.Control.LambdaSplitting in
3126 :     val _ = set (Default (SOME a))
3127 :     end
3128 :    
3129 :     - To turn lambda-splitting off for a given ML souce file (say: a.sml)
3130 :     write (in the respective .cm-file):
3131 :     a.sml (lambdasplitting:off)
3132 :     - To turn lambda-splitting for a.sml on with minimal aggressiveness:
3133 :     a.sml (lambdasplitting:on)
3134 :     - To turn lambda-splitting for a.sml on with aggressiveness <a> (where
3135 :     <a> is a decimal non-negative integer):
3136 :     a.sml (lambdasplitting:<a>)
3137 :     - To turn lambda-splitting for a.sml on with maximal aggressiveness:
3138 :     a.sml (lambdasplitting:infinity)
3139 :     - To use the global default for a.sml:
3140 :     a.sml (lambdasplitting:default)
3141 :     or simply
3142 :     a.sml
3143 :    
3144 :     ----------------------------------------------------------------------
3145 : leunga 815 Name: Allen Leung
3146 :     Date: 2001/05/04 01:57:00 EDT
3147 :     Tag: leunga-20010504-sync
3148 :     Description:
3149 : leunga 788
3150 : leunga 815 MLRISC features.
3151 :    
3152 :     1. Fix to CMPXCHG instructions.
3153 :     2. Changed RA interface to allow annotations in callbacks.
3154 :     3. Added a new method to the stream interface to allow annotations updates.
3155 :    
3156 : george 749 ----------------------------------------------------------------------
3157 : blume 812 Name: Matthias Blume
3158 : blume 814 Date: 2001/05/01 11:45:00 EDT
3159 :     Tag: blume-20010501-pcedittmp
3160 :     Description:
3161 :    
3162 :     Changed install.sh to use the current working directory instead of
3163 :     /usr/tmp for a temporary file (pcedittmp). The previous choice
3164 :     of /usr/tmp caused trouble with MacOS X because of file premission
3165 :     problems.
3166 :    
3167 :     ----------------------------------------------------------------------
3168 :     Name: Matthias Blume
3169 : blume 812 Date: 2001/04/20 11:10:00 EDT
3170 :     Tag: blume-20010420-inMLflag
3171 :     Description:
3172 :    
3173 :     - added vp_limitPtrMask to vproc-state.h
3174 :     (for use by the raw-C-calls mechanism to implement proper interrupt
3175 :     handling)
3176 :     - made the ML compiler aware of various data-structure offsets so it
3177 :     can generate code for accessing the vp_inML flag and vp_limitPtrMask
3178 :     - tweaked mlriscGen.sml to have it emit interrupt-handling code for
3179 :     raw C-calls
3180 :    
3181 :     ----------------------------------------------------------------------
3182 : george 810 Name: Lal George
3183 :     Date: 2001/04/20 09:15:28 EDT
3184 :     Tag: george-20010420-macosX
3185 :     Description:
3186 :    
3187 :     - Changes to port to Mac OS X; Darwin.
3188 :    
3189 :     - In the process I found that sqrt was broken on the PPC, because the
3190 :     fsqrt instruction is not implemented.
3191 :    
3192 :     ----------------------------------------------------------------------
3193 : blume 799 Name: Matthias Blume
3194 : blume 808 Date: 2001/04/18 12:45:00 EDT
3195 :     Tag: blume-20010418-ccalls
3196 :     Description:
3197 :    
3198 :     - fixed two off-by-4 errors in the x86-specific c-calls implementation
3199 :     (this bug prevented structure arguments containing pointers from being
3200 :     passed correctly)
3201 :     - changed the raw-C-call code in mlriscGen.sml in such a way that
3202 :     structure arguments are represented as a pointer to the beginning
3203 :     of the structure (instead of having a series of synthesized arguments,
3204 :     one for each structure member)
3205 :    
3206 :     - made makeml script's verbosity level configurable via environment
3207 :     variable (MAKEML_VERBOSITY)
3208 :    
3209 : blume 813 - eliminated placeholder implementations for f32l, w16s, i16s, and f32s
3210 : blume 808 in rawmem-x86.sml; we are now using the real thing
3211 :    
3212 :     ----------------------------------------------------------------------
3213 :     Name: Matthias Blume
3214 : blume 806 Date: 2001/03/22 16:25:00 EST
3215 :     Tag: blume-20010322-bootfiles
3216 :     Description:
3217 :    
3218 :     Created a new set of bootfiles (for your automatic installation convenience).
3219 :    
3220 :     ----------------------------------------------------------------------
3221 :     Name: Matthias Blume
3222 : blume 805 Date: 2001/03/22 15:10:00 EST
3223 :     Tag: blume-20010322-rawmem-parcm
3224 :     Description:
3225 :    
3226 :     1. All "raw memory access" primitives for the new FFI are implemented now
3227 :     (at least on the x86).
3228 :     2. Some further cleanup of CM's parallel make mechanism.
3229 :    
3230 :     ----------------------------------------------------------------------
3231 :     Name: Matthias Blume
3232 : blume 801 Date: 2001/03/19 17:53:00 EST
3233 :     Tag: blume-20010319-parallel
3234 :     Description:
3235 :    
3236 :     Parallel make (using compile servers) now works again.
3237 :    
3238 :     To this end, CM.stabilize and CMB.make have been modified to work in
3239 :     two passes when compile servers are attached:
3240 :     1. Compile everything, do not perform stabilization; this pass
3241 :     uses compile servers
3242 :     2. Stabilize everything; this pass does not use compile servers
3243 :     If there are no compile servers, the two passes are combined into one
3244 :     (as before). Splitting the passes increases the inherent parallelism
3245 :     in the dependency graph because the entire graph including all
3246 :     libraries is available at the same time. This, in turn, improves
3247 :     server utilization. The downside is that the master process will
3248 :     have to do some extra work after compilation is done (because for
3249 :     technical reasons it must re-read all the binfiles during stabilization).
3250 :    
3251 :     ----------------------------------------------------------------------
3252 :     Name: Matthias Blume
3253 : blume 800 Date: 2001/03/16 12:22:00 EST
3254 :     Tag: blume-20010316-bootfiles
3255 :     Description:
3256 :    
3257 :     Created a new set of bootfiles (for your automatic installation convenience).
3258 :    
3259 :     ----------------------------------------------------------------------
3260 :     Name: Matthias Blume
3261 : blume 799 Date: 2001/03/16 11:00:00 EST
3262 :     Tag: blume-20010316-MLTREE-fixup
3263 :     Description:
3264 :    
3265 :     This is a minor fixup for an (untagged) earlier commit by Allen.
3266 :     (A file was missing).
3267 :    
3268 :     ----------------------------------------------------------------------
3269 : leunga 788 Name: Allen Leung
3270 : leunga 796 Date: Mon Mar 5 18:54:57 EST 2001
3271 :     Tag: leunga-20010305-cut-support
3272 :    
3273 :     1. New support for alternative control-flow in MLTREE.
3274 :     Currently we support
3275 :    
3276 :     FLOW_TO(CALL ...., [k1,...,kn])
3277 :    
3278 :     This is needed for 'cuts to' in C-- and try/handle-like constructs
3279 :     in Moby
3280 :    
3281 :     New assembler flag "asm-show-cutsto" to turn on control-flow debugging.
3282 :    
3283 :     2. Register Allocator
3284 :    
3285 :     Changes in interface [from Fermin, John]
3286 :    
3287 :     3. Alpha 8-bit SLL support [Fermin]
3288 :    
3289 :     4. All architectures
3290 :    
3291 :     A new module (ClusterExpandCopies) for expanding parallel copies.
3292 :    
3293 :     ----------------------------------------------------------------------
3294 :     Name: Allen Leung
3295 : leunga 788 Date: 2001/02/27 23:07:00 EST
3296 :     Tag: leunga-20010227-minor-stuff
3297 :    
3298 :     1. Alpha bug fix for CMOVNE
3299 :     2. Handle mltree COND(..,FCMP ...,...)
3300 :     3. Bug fix in simplifier
3301 :    
3302 :     ----------------------------------------------------------------------
3303 : blume 777 Name: Matthias Blume
3304 : blume 781 Date: 2001/01/30 17:50:00 EST
3305 :     Tag: blume-20010130-sync
3306 :     Description:
3307 :    
3308 :     This is just a minor update to sync my devel branch with the main brach.
3309 :     The only visible change is the addition of some README files.
3310 :    
3311 :     ----------------------------------------------------------------------
3312 :     Name: Matthias Blume
3313 : blume 778 Date: 2001/01/12 23:30:00 JST
3314 :     Tag: blume-20010112-bootfiles
3315 :     Description:
3316 :    
3317 :     Made a new set of bootfiles that goes with the current state of the
3318 :     repository.
3319 :    
3320 :     ----------------------------------------------------------------------
3321 :     Name: Matthias Blume
3322 : blume 777 Date: 2001/01/12 21:20:00 JST
3323 :     Tag: blume-20010112-sync
3324 :     Description:
3325 :    
3326 :     I am just flushing out some minor changes that had accumulated in
3327 :     my private branch in order to sync with the main tree. (This is
3328 :     mainly because I had CVS trouble when trying to merge _into_ my
3329 :     private branch.)
3330 :    
3331 :     Most people should be completely unaffected by this.
3332 :    
3333 :     ----------------------------------------------------------------------
3334 : leunga 775 Name: Allen Leung
3335 :     Date: Thu Jan 11 21:03:00 EST 2001
3336 :     Tag: leunga-20010111-labexp=mltree
3337 :     Description:
3338 :    
3339 :     1. Removed the type LabelExp and replace it by MLTree.
3340 :     2. Rewritten mltree-simplify with the pattern matcher tool.
3341 :     3. There were some bugs in alpha code generator which would break
3342 :     64-bit code generation.
3343 :     4. Redo the tools to generate code with the
3344 :     5. The CM files in MLRISC (and in src/system/smlnj/MLRISC)
3345 :     are now generated by perl scripts.
3346 :    
3347 :     ----------------------------------------------------------------------
3348 : blume 771 Name: Matthias Blume
3349 : blume 774 Date: 2001/01/10 21:55:00 JST
3350 :     Tag: blume-20010110-rcc
3351 :     Description:
3352 :    
3353 :     The RCC stuff now seems to work (but only on the x86).
3354 :     This required hacking of the c-calls interface (and -implementation) in
3355 :     MLRISC.
3356 :    
3357 :     Normal compiler users should be unaffected.
3358 :    
3359 :     ----------------------------------------------------------------------
3360 :     Name: Matthias Blume
3361 : blume 773 Date: 2001/01/09 01:20:00 JST
3362 :     Tag: blume-20010109-rcc
3363 :     Description:
3364 :    
3365 :     This is a fairly big patch, flushing out a large number of pending
3366 :     changes that I made to my development copy over the last couple of days.
3367 :    
3368 :     Of practical relevance at this moment is a workaround for a pickling
3369 :     bug that Allen ran into the other day. The cause of the bug itself is
3370 :     still unknown and it might be hard to fix it properly, but the
3371 :     workaround has some merits of its own (namely somewhat reducing pickling
3372 :     overhead for certain libraries). Therefore, I think this solution should
3373 :     be satisfactory at this time.
3374 :    
3375 :     The rest of the changes (i.e., the vast majority) has to do with my
3376 :     ongoing efforts of providing direct support for C function calls from
3377 :     ML. At the moment there is a new primop "RAW_CCALL", typing magic
3378 :     in types/cproto.sml (invoked from FLINT/trans/translate.sml), a new
3379 :     case in the FLINT CPS datatype (RCC), changes to cps/convert.sml to
3380 :     translate uses of RAW_CCALL into RCC, and changes to mlriscGen.sml to
3381 :     handle RCC.
3382 :    
3383 :     The last part (the changes to mlriscGen.sml) are still known to be
3384 :     wrong on the x86 and not implemented on all other architectures. But
3385 :     the infrastructure is in place. I had to change a few functor
3386 :     signatures in the backend to be able to route the CCalls interface
3387 :     from MLRISC there, and I had to specialize the mltree type (on the
3388 :     x86) to include the necessary extensions. (The extensions themselves
3389 :     were already there and redy to go in MLRISC/x86).
3390 :    
3391 :     Everything should be very happy as soon as someone helps me with
3392 :     mlriscGen.sml...
3393 :    
3394 :     In any case, nothing of this should matter to anyone as long as the
3395 :     new primop is not being used (which is going to be the case unless you
3396 :     find it where I hid it :). The rest of the compiler is completely
3397 :     unaffected.
3398 :    
3399 :     ----------------------------------------------------------------------
3400 :     Name: Matthias Blume
3401 : blume 772 Date: 2001/01/05 00:30:00 JST
3402 :     Tag: blume-20010105-primops
3403 :     Description:
3404 :    
3405 :     Added some experimental support for work that I am doing right now.
3406 :     These changes mostly concern added primops, but there is also a new
3407 :     experimental C library in the runtime system (but currently not enabled
3408 :     anywhere except on Linux/X86).
3409 :    
3410 :     In the course of adding primops (and playing with them), I discovered that
3411 :     Zhong's INL_PRIM hack (no type info for certain primops) was, in fact, badly
3412 :     broken. (Zhong was very right he labeled this stuff as "major gross hack".)
3413 :     To recover, I made type information in INL_PRIM mandatory and changed
3414 :     prim.sml as well as built-in.sml accordingly. The InLine structure now
3415 :     has complete, correct type information (i.e., no bottom types).
3416 :    
3417 :     Since all these changes mean that we need new binfiles, I also bumped the
3418 :     version number to 110.32.1.
3419 :    
3420 :     ----------------------------------------------------------------------
3421 :     Name: Matthias Blume
3422 : blume 771 Date: 2000/12/30 22:10:00 JST
3423 :     Tag: blume-20001230-various
3424 :     Description:
3425 :    
3426 :     Added proxy libraries for MLRISC and let MLRISC libraries refer
3427 :     to each other using path anchors. (See CM manual for explanation.)
3428 :    
3429 :     Updated CM documentation.
3430 :    
3431 :     Fixed some bugs in CM.
3432 :    
3433 :     Implemented "proxy" libraries (= syntactic sugar for CM).
3434 :    
3435 :     Added "-quiet" option to makeml and changed runtime system accordingly.
3436 :    
3437 :     Added cleanup handler for exportML to reset timers and compiler stats.
3438 :    
3439 :     ----------------------------------------------------------------------
3440 : george 761 Name: Lal George
3441 :     Date: 2000/12/22 22:22:58 EST 2000
3442 :     Tag: Release_110_32
3443 :     Description:
3444 :    
3445 :     Infinite precision used throughout MLRISC.
3446 :     see MLRISC/mltree/machine-int.sig
3447 :    
3448 :     ----------------------------------------------------------------------
3449 : blume 756 Name: Matthias Blume
3450 : blume 760 Date: 2000/12/22 23:16:00 JST
3451 :     Tag: blume-20001222-warn
3452 :     Description:
3453 : blume 759
3454 : blume 760 Corrected wording and formatting of some CM warning message which I
3455 :     broke in my previous patch.
3456 : blume 759
3457 :     ----------------------------------------------------------------------
3458 :     Name: Matthias Blume
3459 : blume 763 Date: 2000/12/22 21:20:00 JST
3460 :     Tag: blume-20001222-anchorenv
3461 :     Description:
3462 :    
3463 :     Fixed CM's handling of anchor environments in connection with CMB.make.
3464 :    
3465 :     ----------------------------------------------------------------------
3466 :     Name: Matthias Blume
3467 : blume 758 Date: 2000/12/22 13:15:00 JST
3468 :     Tag: blume-20001222-cleanup
3469 :     Description:
3470 :    
3471 :     Removed src/cm/ffi which does not (and did not) belong here.
3472 :    
3473 :     ----------------------------------------------------------------------
3474 :     Name: Matthias Blume
3475 : blume 757 Date: 2000/12/21 23:55:00 JST
3476 :     Tag: blume-20001221-exn
3477 :     Description:
3478 :    
3479 :     Probably most important: CM no longer silently swallows all exceptions
3480 :     in the compiler.
3481 :     Plus: some other minor CM changes. For example, CM now reports some
3482 :     sizes for generated binfiles (code, data, envpickle, lambdapickle).
3483 :    
3484 :     ----------------------------------------------------------------------
3485 :     Name: Matthias Blume
3486 : blume 756 Date: 2000/12/15 00:01:05 JST
3487 :     Tag: blume-20001215-dirtool
3488 :     Description:
3489 :    
3490 :     - "dir" tool added.
3491 :     - improvements and cleanup to Tools structure
3492 :     - documentation updates
3493 :    
3494 :     ----------------------------------------------------------------------
3495 : leunga 752 Name: Allen Leung
3496 : leunga 755 Date: Thu Dec 14 03:45:24 EST 2000
3497 :     Description:
3498 :     Tag: leunga-20001214-int-inf
3499 :     Description:
3500 :    
3501 :     In IntInf, added these standard functions, which are missing from our
3502 :     implementation:
3503 :    
3504 :     andb : int * int -> int
3505 :     xorb : int * int -> int
3506 :     orb : int * int -> int
3507 :     notb : int -> int
3508 :     << : int * word -> int
3509 :     ~>> : int * word -> int
3510 :    
3511 :     Not tested, I hope they are correct.
3512 :    
3513 :     ----------------------------------------------------------------------
3514 :     Name: Allen Leung
3515 : leunga 752 Date: Fri Dec 8 19:23:26 EST 2000
3516 :     Description:
3517 :     Tag: leunga-20001208-nowhere
3518 :     Description:
3519 :    
3520 :     Slight improvements to the 'nowhere' tool to handle OR-patterns,
3521 :     to generate better error messages etc. Plus a brief manual.
3522 :    
3523 :     ----------------------------------------------------------------------
3524 : george 749 Name: Lal George
3525 :     Date: 2000/12/08 09:54:02 EST 2000
3526 :     Tag: Release_110_31
3527 :     Description:
3528 : george 705
3529 : george 749 - Version 110.31
3530 : leunga 591 ----------------------------------------------------------------------
3531 : leunga 744 Name: Allen Leung
3532 :     Date: Thu Dec 7 22:01:04 EST 2000
3533 :     Tag: leunga-20001207-cell-monster-hack
3534 :     Description:
3535 :    
3536 :     Major MLRISC internal changes. Affect all clients.
3537 :     Summary:
3538 :    
3539 :     1. Type CELLS.cell = int is now replaced by a datatype.
3540 :     As a result, the old regmap is now gone. Almost all interfaces
3541 :     in MLRISC change as a consequence.
3542 :    
3543 :     2. A new brand version of machine description tool (v3.0) that generates
3544 :     modules expecting the new interface. The old version is removed.
3545 :    
3546 :     3. The RA interface has been further abstracted into two new functors.
3547 :     RISC_RA and X86RA. These functors have much simpler interfaces.
3548 :     [See also directory MLRISC/demo.]
3549 :    
3550 :     4. Some other new source->source code generation tools are available:
3551 :    
3552 :     a. MLRISC/Tools/RewriteGen -- generate rewriters from rules.
3553 :     b. MLRISC/Tools/WhereGen -- expands conditional pattern matching rules.
3554 :     I use this tool to generate the peephole optimizers---with the new
3555 :     cell type changes, peephole rules are becoming difficult to write
3556 :     without conditional pattern matching.
3557 :    
3558 :     5. More Intmap -> IntHashTable change. Previous changes by Matthias didn't
3559 :     cover the entire MLRISC source tree so many things broke.
3560 :    
3561 :     6. CM files have been moved to the subdirectory MLRISC/cm.
3562 :     They are moved because there are a lot of them and they clutter up the
3563 :     root dir.
3564 :    
3565 :     7. More detailed documentation to come...
3566 :    
3567 :     NOTE: To rebuild from 110.30 (ftp distribution), you'll have to do
3568 :     a makeml -rebuild first. This is because of other other
3569 :     changes that Matthias has made (see below).
3570 :    
3571 :    
3572 :     ----------------------------------------------------------------------
3573 : blume 733 Name: Matthias Blume
3574 : blume 742 Date: 2000/11/30 23:12:00 JST
3575 :     Tag: blume-20001130-filereorg
3576 :     Description:
3577 :    
3578 :     Some manual updates and some file reorganizations in CM.
3579 :    
3580 :     ----------------------------------------------------------------------
3581 :     Name: Matthias Blume
3582 : blume 737 Date: 2000/11/24 17:45:00 JST
3583 :     Tag: blume-20001124-link
3584 :     Description:
3585 :    
3586 :     Drastically improved link traversal code for the case that the dynamic
3587 :     value was already loaded at bootstrap time. As a result, CM and CMB
3588 :     now both load blazingly fast -- even on a very slow machine. Also,
3589 :     memory consumption has been further reduced by this.
3590 :    
3591 :     Warning: The format of the PIDMAP file has changed. THerefore, to
3592 :     bootstrap you have to do this:
3593 :    
3594 :     1. Run CMB.make
3595 :     2. Make a symbolic link for the boot directory:
3596 :     ln -s sml.boot.ARCH-OS xxx
3597 :     3. "Rebuild" the boot directory:
3598 :     ./makeml -boot xxx -rebuild sml ; rm xxx
3599 :     4. Boot normally:
3600 :     ./makeml
3601 :    
3602 :     ----------------------------------------------------------------------
3603 :     Name: Matthias Blume
3604 : blume 735 Date: 2000/11/21 21:20:00 JST
3605 :     Tag: blume-20001121-tools
3606 :     Description:
3607 :    
3608 :     Continued hacking on autoloading problem -- with success this time.
3609 :     Also changed tool-plugin mechanism. See new CM manual.
3610 :    
3611 :     ----------------------------------------------------------------------
3612 :     Name: Matthias Blume
3613 : blume 734 Date: 2000/11/19 14:30:00 JST
3614 :     Tag: blume-20001119-autoload
3615 :     Description:
3616 :    
3617 :     Some hacking to make autoloading faster. Success for CMB, no success
3618 :     so far for CM. There is a reduced structure CM' that autoloads faster.
3619 :     (This is a temporary, non-documented hack to be eliminated again when
3620 :     the general problem is solved.)
3621 :    
3622 :     ----------------------------------------------------------------------
3623 :     Name: Matthias Blume
3624 : blume 733 Date: 2000/11/17 14:10:00 JST
3625 :     Tag: blume-20001117-pickle-lib
3626 :     Description:
3627 :    
3628 :     1. Eliminated comp-lib.cm
3629 :     2. Made pickle-lib.cm
3630 :     3. Eliminated all uses of intset.sml (from comp-lib.cm)
3631 :     4. Replaced all uses of intmap.{sig,sml} (from comp-lib.cm) with
3632 :     equivalent constructs from smlnj-lib.cm (INtHashTable).
3633 :     5. Point 4. also goes for those uses of intmap.* in MLRISC.
3634 :     Duplicated intmap modules thrown out.
3635 :     6. Hunted down all duplicated SCC code and replaced it with
3636 :     equivalent stuff (GraphSCCFn from smlnj-lib.cm).
3637 :     7. Rewrote Feedback module.
3638 :     8. Moved sortedlist.sml into viscomp-lib.cm. Eventually it
3639 :     should be thrown out and equivalent modules from smlnj-lib.cm
3640 :     should be used (IntRedBlackSet, IntListSet, ...).
3641 :    
3642 :     Confirmed that compiler compiles to fixpoint.
3643 :    
3644 :     ----------------------------------------------------------------------
3645 : leunga 731 Name: Allen Leung
3646 :     Date: 2000/11/10 18:00:00
3647 :     Tag: leunga-20001110-new-x86-fp
3648 :    
3649 :     A new x86 floating point code generator has been added.
3650 :     By default this is turned off. To turn this on, do:
3651 :    
3652 :     CM.autoload "$smlnj/compiler.cm";
3653 :     Compiler.Control.MLRISC.getFlag "x86-fast-fp" := true;
3654 :    
3655 :     Changes:
3656 :    
3657 :     1. Changed FTAN to FPTAN so that the assembly output is correct.
3658 :     2. Changed the extension callback for FTANGENT to generate:
3659 :    
3660 :     fptan
3661 :     fstp %st(0)
3662 :     instead of
3663 :     fptan
3664 :     fstpl ftempmem
3665 :    
3666 :     3. Numerous assembly fixes for x86.
3667 :    
3668 :     5. Cleaned up the machine code output module x86/x86MC.sml and added
3669 :     support for a whole bunch of instructions and addressing modes:
3670 :    
3671 :     fadd/fsub/fsubr/fmul/fdiv/fdivr %st, %st(n)
3672 :     faddp/fsubp/fsubrp/fmulp/fdivp/fdivrp %st, %st(n)
3673 :     fadd/fsub/fsubr/fmul/fdiv/fdivr %st(n), %st
3674 :     fiadd/fisub/fisubr/fimul/fidiv/fidivr mem
3675 :     fxch %st(n)
3676 :     fld %st(n)
3677 :     fst %st(n)
3678 :     fst mem
3679 :     fstp %st(n)
3680 :     fucom %st(n)
3681 :     fucomp %st(n)
3682 :    
3683 :     All these are now generated when the fast fp mode is turned on.
3684 :    
3685 :     6. Removed the dedicated registers %st(0), ..., %st(7) from X86CpsRegs
3686 :    
3687 :     ----------------------------------------------------------------------
3688 : blume 729 Name: Matthias Blume
3689 :     Date: 2000/11/09 11:20:00 JST
3690 :     Tag: blume-20001109-scc
3691 :     Description:
3692 :    
3693 :     Eliminated some code duplication:
3694 :    
3695 :     1. Added "where" clause to GraphSCCFn in SML/NJ Library.
3696 :     (Otherwise the functor is useless.)
3697 :     2. Used GraphSCCFn where SCCUtilFun was used previously.
3698 :     3. Got rid of SCCUtilFun (in comp-lib.cm).
3699 :    
3700 :     ----------------------------------------------------------------------
3701 : george 721 Name: Lal George
3702 :     Date: 2000/11/06 09:02:21 EST 2000
3703 :     Tag: Release_110_30
3704 :     Description:
3705 :    
3706 :     - Version 110.30
3707 :     ----------------------------------------------------------------------
3708 : blume 715 Name: Matthias Blume
3709 : blume 716 Date: 2000/11/04 14:45:00
3710 :     Tag: blume-20001104-mlbuild
3711 :     Description:
3712 :    
3713 :     - Made ml-build faster on startup.
3714 :     - Documentation fixes.
3715 :    
3716 :     ----------------------------------------------------------------------
3717 :     Name: Matthias Blume
3718 : blume 715 Date: 2000/11/02 17:00:00 JST
3719 :     Tag: blume-20001102-condcomp
3720 :     Description:
3721 :    
3722 :     - Small tweaks to pickler -- new BOOTFILES!
3723 :     - Version bumped to 110.29.2.
3724 :     - Added conditional compilation facility to init.cmi (see comment there).
3725 :     ----------------------------------------------------------------------
3726 : leunga 713 Name: Allen Leung
3727 :     Date: 2000/10/23 19:31:00
3728 :     Tag: leunga-20001023-demo-ra
3729 :    
3730 :     1. Minor RA changes that improves spilling on x86 (affects Moby and C-- only)
3731 :     2. Test programs for the graph library updated
3732 :     3. Some new MLRISC demo programs added
3733 :    
3734 :     ----------------------------------------------------------------------
3735 : blume 710 Name: Matthias Blume
3736 : blume 711 Date: 2000/08/31 22:15:00 JST
3737 :     Tag: blume-20001017-errmsg
3738 :     Description:
3739 :    
3740 :     More error message grief: Where there used to be no messages, there
3741 :     now were some that had bogus error regions. Fixed.
3742 :    
3743 :     ----------------------------------------------------------------------
3744 :     Name: Matthias Blume
3745 : blume 710 Date: 2000/08/31 17:30:00 JST
3746 :     Tag: blume-20001017-v110p29p1
3747 :     Description:
3748 :    
3749 :     I made a version 110.29.1 with new bootfiles.
3750 :    
3751 :     Changes: Modified pickler/unpickler for faster and leaner unpickling.
3752 :     CM documentation changes and a small bugfix in CM's error reporting.
3753 :    
3754 :     ----------------------------------------------------------------------
3755 : george 705 Name: Lal George
3756 :     Date: 2000/09/27 14:42:35 EDT
3757 :     Tag: george-20000927-nodestatus
3758 :     Description:
3759 :    
3760 :     Changed the type of the nodestatus, so that:
3761 :    
3762 :     SPILLED(~1) is now SPILLED
3763 :     SPILLED(m) where m>=0 is now MEMREG(m)
3764 :     SPILLED(s) where s<~1 is now SPILL_LOC(~s)
3765 :    
3766 :     ----------------------------------------------------------------------
3767 : blume 697 Name: Matthias Blume
3768 : blume 703 Date: 2000/09/07 14:45:00 JST
3769 :     Tag: blume-20000907-cmerrmsg
3770 :     Description:
3771 :    
3772 :     Small tweak to CM to avoid getting ML syntax error messages twice.
3773 :    
3774 :     ----------------------------------------------------------------------
3775 :     Name: Matthias Blume
3776 : blume 701 Date: 2000/08/31 18:00:00 JST
3777 :     Tag: blume-20000831-cvsbootfiles
3778 :     Description:
3779 :    
3780 :     New URL for boot files (because the 110.29 files on the BL server do
3781 :     now work correctly with my updated install scripts for yacc and lex).
3782 :    
3783 :     ----------------------------------------------------------------------
3784 :     Name: Matthias Blume
3785 : blume 697 Date: 2000/08/08 12:33:00 JST
3786 :     Tag: blume-20000808-manual
3787 :     Description:
3788 :    
3789 :     Tiny update to CM manual.
3790 :    
3791 :     ----------------------------------------------------------------------
3792 : leunga 695 Name: Allen Leung
3793 :     Date: 2000/08/7 19:31:00
3794 :     Tag: leunga-20000807-a-whole-bunch-of-stuff
3795 :    
3796 :     Moby, C--, SSA, x86, machine descriptions etc. Should only affect C--
3797 :     and Mobdy.
3798 :    
3799 :     1. x86
3800 :    
3801 :     a. Fixes to peephole module by John and Dan.
3802 :     b. Assembly fix to SETcc by Allen.
3803 :     c. Fix to c-call by John.
3804 :     d. Fix to spilling by John. (This one deals with the missing FSTPT case)
3805 :     e. Instruction selection optimization to SETcc as suggested by John.
3806 :    
3807 :     For example,
3808 :    
3809 :     MV(32, x, COND(32, CMP(32, LT, a, b), LI 1, LI 0))
3810 :    
3811 :     should generate:
3812 :    
3813 :     MOVL a, x
3814 :     SUBL b, x
3815 :     SHRL 31, x
3816 :    
3817 :     2. IR stuff
3818 :    
3819 :     A bunch of new DJ-graph related algorithms added. These
3820 :     speed up SSA construction.
3821 :    
3822 :     3. SSA + Scheduling
3823 :    
3824 :     Added code for SSA and scheduling to the repository
3825 :    
3826 :     ----------------------------------------------------------------------
3827 : george 694 Name: Lal George
3828 :     Date: 2000/07/27 11:53:14 EDT
3829 :    
3830 :     Tag: lal-20000727-linux-ppc
3831 :     Description:
3832 :    
3833 :     Made changes to support Linux PPC.
3834 :     p.s. I have confirmation that the 110.29 boot files work fine.
3835 :    
3836 :     ----------------------------------------------------------------------
3837 : blume 684 Name: Matthias Blume
3838 : blume 692 Date: 2000/07/27 17:40:00 JST
3839 :     Tag: blume-20000727-scripts
3840 :     Description:
3841 :    
3842 :     !!!! WARNING !!!!
3843 :     You must recompile the runtime system!
3844 :     !!!! WARNING !!!!
3845 :    
3846 :     This is basically another round of script-enhancements:
3847 :    
3848 :     1. sml, ml-build, and ml-makedepend accept options -D and -U to define
3849 :     and undefine CM preprocessor symbols.
3850 :    
3851 :     2. ml-build avoids generating a new heap image if it finds that the
3852 :     existing one is still ok. (The condition is that no ML file had to
3853 :     be recompiled and all ML files are found to be older that the heap
3854 :     file.)
3855 :    
3856 :     To make this work smoothly, I also hacked the runtime system as
3857 :     well as SMLofNJ.SysInfo to get access to the heap image suffix
3858 :     (.sparc-solaris, ...) that is currently being used.
3859 :    
3860 :     Moreover, the signature of CM.mk_standalone has changed. See the
3861 :     CM manual.
3862 :    
3863 :     3. ml-makedepend accepts additional options -n, -a, and -o. (See the
3864 :     CM manual for details.)
3865 :    
3866 :     4. More CM manual updates:
3867 :     - all of the above has been documented.
3868 :     - there is now a section describing the (CM-related) command line
3869 :     arguments that are accepted by the "sml" command
3870 :    
3871 :     ----------------------------------------------------------------------
3872 :     Name: Matthias Blume
3873 : blume 691 Date: 2000/07/25 16:20:00 JST
3874 :     Tag: blume-20000725-makedepend
3875 :     Description:
3876 :    
3877 :     Added a script called ml-makedepend. This can be used in makefiles
3878 :     for Unix' make in a way very similar to the "makedepend" command for
3879 :     C.
3880 :    
3881 :     The script internally uses function CM.sources.
3882 :    
3883 :     Synopsis:
3884 :    
3885 :     ml-makedepend [-f makefile] cmfile targetname
3886 :    
3887 :     The default for the makefile is "makefile" (or "Makefile" should
3888 :     "makefile" not exist).
3889 :    
3890 :     ml-makedepend adds a cmfile/targetname-specific section to this
3891 :     makefile (after removing the previous version of this section). The
3892 :     section contains a single dependency specification with targetname on
3893 :     the LHS (targetname is an arbitrary name), and a list of files derived
3894 :     from the cmfile on the RHS. Some of the files on the RHS are
3895 :     ARCH/OPSYS-specific. Therefore, ml-makedepend inserts references to
3896 :     "make" variables $(ARCH) and $(OPSYS) in place of the corresponding
3897 :     path names. The makefile writer is responsible for making sure that
3898 :     these variables have correct at the time "make" is invoked.
3899 :    
3900 :     ----------------------------------------------------------------------
3901 :     Name: Matthias Blume
3902 : blume 690 Date: 2000/07/22 23:30:00 JST
3903 :     Tag: blume-20000722-urlupdate
3904 :     Description:
3905 :    
3906 :     Changed BOOT and config/srcarchiveurl to point to BL server:
3907 :    
3908 :     ftp://ftp.research.bell-labs.com/dist/smlnj/working/110.29/
3909 :    
3910 :     ----------------------------------------------------------------------
3911 :     Name: Matthias Blume
3912 : blume 686 Date: 2000/07/18 18:00:00 JST
3913 :     Tag: blume-20000718-Version_110_29
3914 :     Description:
3915 :    
3916 :     1. Updated src/compiler/TopLevel/main/version.sml to version 110.29
3917 :    
3918 :     2. Updated config/version to 110.29
3919 :    
3920 :     3. Updated config/srcarchiveurl
3921 :    
3922 :     3. New boot files!
3923 :     ftp://ftp.cs.princeton.edu/pub/people/blume/sml/110.29-autofetch
3924 :    
3925 :     ----------------------------------------------------------------------
3926 :     Name: Matthias Blume
3927 : blume 684 Date: 2000/07/11 13:58:00 JST
3928 :     Tag: blume-20000711-doctypo
3929 :     Description:
3930 :    
3931 :     Fixed a few typos in CM manual.
3932 :    
3933 :     ----------------------------------------------------------------------
3934 : leunga 683 Name: Allen Leung
3935 :     Date: 2000/06/15 00:38:00
3936 :     Tag: leunga-20000704-sparc-x86
3937 :    
3938 :     1. x86 peephole improvement sp += k; sp -= k => nop [from John]
3939 :     2. fix to x86 RET bug [found by Dan Grossman]
3940 :     3. sparc assembly bug fix for ticc instructions [found by Fermin]
3941 :    
3942 :     Affects c-- and moby only
3943 :    
3944 :     ----------------------------------------------------------------------
3945 : blume 680 Name: Matthias Blume
3946 : blume 682 Date: 2000/07/04 15:26:00
3947 :     Tag: blume-20000704-trigger
3948 :     Description:
3949 :    
3950 :     1. Improvements to CM manual.
3951 :     2. SMLofNJ.Internals.BTrace.trigger reinstated as an alternative way
3952 :     of getting a back-trace. The function, when called, raises an
3953 :     internal exception which explicitly carries the full back-trace history,
3954 :     so it is unaffected by any intervening handle-raise pairs ("trivial"
3955 :     or not). The interactive loop will print that history once it arrives
3956 :     at top level.
3957 :     Short of having all exceptions implicitly carry the full history, the
3958 :     recommended way of using this facility is:
3959 :     - compile your program with instrumentation "on"
3960 :     - run it, when it raises an exception, look at the history
3961 :     - if the history is "cut off" because of some handler, go and modify
3962 :     your program so that it explicitly calls BTrace.trigger
3963 :     - recompile (still instrumented), and rerun; look at the full history
3964 :    
3965 :     ----------------------------------------------------------------------
3966 :     Name: Matthias Blume
3967 :     Date: 2000/07/03 15:36:00 JST
3968 : blume 680 Tag: blume-20000702-manual
3969 :     Description:
3970 :    
3971 :     Small corrections and updates to CM manual.
3972 :    
3973 :     ----------------------------------------------------------------------
3974 : blume 682 Name: Matthias Blume
3975 : blume 679 Date: 2000/06/29 16:04:00 JST
3976 :     Tag: blume-20000629-yacctool
3977 :     Description:
3978 :    
3979 :     Changes:
3980 :    
3981 :     1. Class "mlyacc" now takes separate arguments to pass options to
3982 :     generated .sml- and .sig-files independently.
3983 :     2. Corresponding CM manual updates.
3984 :     3. BTrace module now also reports call sites. (However, for loop clusters
3985 :     it only shows from where the cluster was entered.) There are associated
3986 :     modifications to core.sml, internals.{sig,sml}, btrace.sml, and btimp.sml.
3987 :    
3988 :     ----------------------------------------------------------------------
3989 : blume 675 Name: Matthias Blume
3990 : blume 678 Date: 2000/06/27 16:51:00 JST
3991 :     Tag: blume-20000627-noweb
3992 :     Description:
3993 :    
3994 :     Changes:
3995 :    
3996 :     1. Implemented "subdir" and "witness" options for noweb tool.
3997 :     This caused some slight internal changes in CM's tool implementation.
3998 :     2. Fixed bug in "tool plugin" mechanism. This is essentially cleaning
3999 :     some remaining issues from earlier path anchor changes.
4000 :     3. Updated CM manual accordingly.
4001 :    
4002 :     4. Changed implementation of back-tracing so that I now consider it
4003 :     ready for prime-time.
4004 :    
4005 :     In particular, you don't have to explicitly trigger the back-trace
4006 :     anymore. Instead, if you are running BTrace-instrumented code and
4007 :     there is an uncaught exception (regardless of whether or not it was
4008 :     raised in instrumented code), the top-level evalloop will print
4009 :     the back-trace.
4010 :    
4011 :     Features:
4012 :    
4013 :     - Instrumented and uninstrumented code work together seemlessly.
4014 :     (Of course, uninstrumented code is never mentioned in actual
4015 :     back-traces.)
4016 :    
4017 :     - Asymptotic time- and space-complexity of instrumented code is
4018 :     equal to that of uninstrumented code. (This means that
4019 :     tail-recursion is preserved by the instrumentation phase.)
4020 :    
4021 :     - Modules whose code has been instrumented in different sessions
4022 :     work together without problem.
4023 :    
4024 :     - There is no penalty whatsoever on uninstrumented code.
4025 :    
4026 :     - There is no penalty on "raise" expressions, even in
4027 :     instrumented code.
4028 :    
4029 :     A potential bug (or perhaps it is a feature, too):
4030 :    
4031 :     A back-trace reaches no further than the outermost instrumented
4032 :     non-trivial "raise". Here, a "trivial" raise is one that is the
4033 :     sole RHS of a "handle" rule. Thus, back-traces reach trough
4034 :    
4035 :     <exp> handle e => raise e
4036 :    
4037 :     and even
4038 :    
4039 :     <exp> handle Foo => raise Bar
4040 :    
4041 :     and, of course, through
4042 :    
4043 :     <exp> handle Foo => ...
4044 :    
4045 :     if the exception was not Foo.
4046 :    
4047 :     Back-traces always reach right through any un-instrumented code
4048 :     including any of its "handle" expressions, trivial or not.
4049 :    
4050 :     To try this out, do the following:
4051 :    
4052 :     - Erase all existing binfiles for your program.
4053 :     (You may keep binfiles for those modules where you think you
4054 :     definitely don't need back-tracing.)
4055 :     - Turn on back-trace instrumentation:
4056 :     SMLofNJ.Internals.BTrace.mode (SOME true);
4057 :     - Recompile your program. (I.e., run "CM.make" or "use".)
4058 :     - You may now turn instrumentation off again (if you want):
4059 :     SMLofNJ.Internals.BTrace.mode (SOME false);
4060 :     - Run your program as usual. If it raises an exception that
4061 :     reaches the interactive toplevel, then a back-trace will
4062 :     automatically be printed. After that, the toplevel loop
4063 :     will print the exception history as usual.
4064 :    
4065 :     ----------------------------------------------------------------------
4066 :     Name: Matthias Blume
4067 : blume 677 Date: 2000/06/26 09:56:46 JST
4068 :     Tag: blume-20000626-setup
4069 :     Description:
4070 :    
4071 :     CM: - setup-parameter to "sml" added; this can be used to run arbitrary
4072 :     ML code before and after compiling a file (e.g., to set compiler
4073 :     flags)
4074 :    
4075 :     Compiler: - improved btrace API (in core.sml, internals.{sig,sml})
4076 :     - associated changes to btrace.sml (BTrace instrumentation pass)
4077 :     - cleaner implementation of btimp.sml (BTrace tracing and report
4078 :     module)
4079 :    
4080 :     CM manual: * new path encoding documented
4081 :     * description of setup-parameter to "sml" added
4082 :    
4083 :     The biggest user-visible change to back-tracing is that it is no
4084 :     longer necessary to compile all traced modules within the same
4085 :     session. (This was a real limitation.)
4086 :    
4087 :     ----------------------------------------------------------------------
4088 :     Name: Matthias Blume
4089 : blume 676 Date: 2000/06/24 12:40:00 JST
4090 :     Tag: blume-20000624-startup
4091 :     Description:
4092 :    
4093 :     Fixes startup slowdown problem. (I was calling SrcPath.sync a _tad_
4094 :     bit too often -- to put it mildly. :)
4095 :    
4096 :     ----------------------------------------------------------------------
4097 :     Name: Matthias Blume
4098 : blume 675 Date: 2000/06/23 18:20:00 JST
4099 :     Tag: blume-20000623-btrace
4100 :     Description:
4101 :    
4102 :     This updates adds a backtrace facility to aid programmers in debugging
4103 :     their programs. This involves the following changes:
4104 :    
4105 :     1. Module system/smlnj/init/core.sml (structure _Core) now has hooks for
4106 :     keeping track of the current call stack. When programs are compiled
4107 :     in a special mode, the compiler will insert calls to these hooks
4108 :     into the user program.
4109 :     "Hook" means that it is possible for different implementations of
4110 :     back-tracing to register themselves (at different times).
4111 :    
4112 :     2. compiler/MiscUtil/profile/btrace.sml implements the annotation phase
4113 :     as an Absyn.dec->Absyn.dec rewrite. Normally this phase is turned off.
4114 :     It can be turned on using this call:
4115 :     SMLofNJ.Internals.BTrace.mode (SOME true);
4116 :     Turning it off again:
4117 :     SMLofNJ.Internals.BTrace.mode (SOME false);
4118 :     Querying the current status:
4119 :     SMLofNJ.Internals.BTrace.mode NONE;
4120 :     Annotated programs are about twice as big as normal ones, and they
4121 :     run a factor of 2 to 4 slower with a dummy back-trace plugin (one
4122 :     where all hooks do nothing). The slowdown with a plugin that is
4123 :     actually useful (such as the one supplied by default) is even greater,
4124 :     but in the case of the default plugin it is still only an constant
4125 :     factor (amortized).
4126 :    
4127 :     3. system/Basis/Implementation/NJ/internals.{sig,sml} have been augmented
4128 :     with a sub-structure BTrace for controlling back-tracing. In particular,
4129 :     the above-mentioned function "mode" controls whether the annotation
4130 :     phase is invoked by the compiler. Another important function is
4131 :     "trigger": when called it aborts the current execution and causes
4132 :     the top-level loop to print a full back-trace.
4133 :    
4134 :     4. compiler/MiscUtil/profile/btimp.sml is the current default plugin
4135 :     for back-tracing. It keeps track of the dynamic call stack and in
4136 :     addition to that it keeps a partial history at each "level" of that
4137 :     stack. For example, if a tail-calls b, b tail-calls c, and c tail-calls
4138 :     d and b (at separate times, dynamically), then the report will show:
4139 :    
4140 :     GOTO d
4141 :     /c
4142 :     GOTO \b
4143 :     CALL a
4144 :    
4145 :     This shows that there was an initial non-tail call of a, then a
4146 :     tail-call to b or c, looping behavior in a cluster of functions that
4147 :     consist of b and c, and then a goto from that cluster (i.e., either from
4148 :     b or from c) to d.
4149 :    
4150 :     Note that (depending on the user program) the amount of information
4151 :     that the back-trace module has to keep track of at each level is bounded
4152 :     by a constant. Thus, the whole implementation has the same asymptotical
4153 :     complexity as the original program (both in space and in time).
4154 :    
4155 :     5. compiler/TopLevel/interact/evalloop.sml has been modified to
4156 :     handle the special exception SMLofNJ.Internals.BTrace.BTrace
4157 :     which is raised by the "trigger" function mentioned above.
4158 :    
4159 :     Notes on usage:
4160 :    
4161 :     - Annotated code works well together with unannotated code:
4162 :     Unannotated calls simply do not show up at all in the backtrace.
4163 :    
4164 :     - It is not a good idea to let modules that were annotated during
4165 :     different sessions run at the same time. This is because the compiler
4166 :     chooses small integers to identify individual functions, and there
4167 :     will be clashes if different modules were compiled in separate sessions.
4168 :     (Nothing will crash, and you will even be told about the clashes, but
4169 :     back-trace information will in general not be useful.)
4170 :    
4171 :     - Back-tracing can be confused by callcc and capture.
4172 :    
4173 :     - The only way of getting a back-trace right now is to explicitly
4174 :     invoke the "trigger" function from your user program. Eventually, we
4175 :     should make every exception carry back-trace information (if
4176 :     available). But since this creates more overhead at "raise"-time
4177 :     (similar to the current exnHistory overhead), I have not yet
4178 :     implemented this. (The implementation will be rather easy.) With
4179 :     exceptions carrying back-trace information, this facility will be even
4180 :     more useful because users don't need to modify their programs...
4181 :    
4182 :     - While it is possible to compile the compiler with back-trace
4183 :     annotations turned on (I did it to get some confidence in
4184 :     correctness), you must make absolutely sure that core.sml and
4185 :     btimp.sml are compiled WITHOUT annotation! (core.sml cannot actually
4186 :     be compiled with annotation because there is no core access yet, but
4187 :     if you compile btimp.sml with annotation, then the system will go into
4188 :     an infinite recursion and crash.)
4189 :     Since CM currently does not know about BTrace, the only way to turn
4190 :     annotations on and off for different modules of the compiler is to
4191 :     interrupt CMB.make, change the settings, and re-invoke it. Of course,
4192 :     this is awkward and clumsy.
4193 :    
4194 :     Sample sessions:
4195 :    
4196 :     Standard ML of New Jersey v110.28.1 [FLINT v1.5], June 5, 2000
4197 :     - SMLofNJ.Internals.BTrace.mode (SOME true);
4198 :     [autoloading]
4199 :     [autoloading done]
4200 :     val it = false : bool
4201 :     - structure X = struct
4202 :     - fun main n = let
4203 :     - fun a (x, 0) = d x
4204 :     - | a (x, n) = b (x, n - 1)
4205 :     - and b (x, n) = c (x, n)
4206 :     - and c (x, n) = a (x, n)
4207 :     - and d x = e (x, 3)
4208 :     - and e (x, 0) = f x
4209 :     - | e (x, n) = e (x, n - 1)
4210 :     - and f 0 = SMLofNJ.Internals.BTrace.trigger ()
4211 :     - | f n = n * g (n - 1)
4212 :     - and g n = a (n, 3)
4213 :     - in
4214 :     - f n
4215 :     - end
4216 :     - end;
4217 :     structure X : sig val main : int -> int end
4218 :     - X.main 3;
4219 :     *** BACK-TRACE ***
4220 :     GOTO stdIn:4.2-13.20: X.main[2].f
4221 :     GOTO-( stdIn:4.2-13.20: X.main[2].e
4222 :     GOTO stdIn:4.2-13.20: X.main[2].d
4223 :     / stdIn:4.2-13.20: X.main[2].a
4224 :     | stdIn:4.2-13.20: X.main[2].b
4225 :     GOTO-\ stdIn:4.2-13.20: X.main[2].c
4226 :     CALL stdIn:4.2-13.20: X.main[2].g
4227 :     GOTO stdIn:4.2-13.20: X.main[2].f
4228 :     GOTO-( stdIn:4.2-13.20: X.main[2].e
4229 :     GOTO stdIn:4.2-13.20: X.main[2].d
4230 :     / stdIn:4.2-13.20: X.main[2].a
4231 :     | stdIn:4.2-13.20: X.main[2].b
4232 :     GOTO-\ stdIn:4.2-13.20: X.main[2].c
4233 :     CALL stdIn:4.2-13.20: X.main[2].g
4234 :     GOTO stdIn:4.2-13.20: X.main[2].f
4235 :     GOTO-( stdIn:4.2-13.20: X.main[2].e
4236 :     GOTO stdIn:4.2-13.20: X.main[2].d
4237 :     / stdIn:4.2-13.20: X.main[2].a
4238 :     | stdIn:4.2-13.20: X.main[2].b
4239 :     GOTO-\ stdIn:4.2-13.20: X.main[2].c
4240 :     CALL stdIn:4.2-13.20: X.main[2].g
4241 :     GOTO stdIn:4.2-13.20: X.main[2].f
4242 :     CALL stdIn:2.15-17.4: X.main[2]
4243 :     -
4244 :    
4245 :     (Note that because of a FLINt bug the above code currently does not
4246 :     compile without BTrace turned on.)
4247 :    
4248 :     Here is another example, using my modified Tiger compiler:
4249 :    
4250 :     Standard ML of New Jersey v110.28.1 [FLINT v1.5], June 5, 2000
4251 :     - SMLofNJ.Internals.BTrace.mode (SOME true);
4252 :     [autoloading]
4253 :     [autoloading done]
4254 :     val it = false : bool
4255 :     - CM.make "sources.cm";
4256 :     [autoloading]
4257 :     ...
4258 :     [autoloading done]
4259 :     [scanning sources.cm]
4260 :     [parsing (sources.cm):parse.sml]
4261 :     [creating directory CM/SKEL ...]
4262 :     [parsing (sources.cm):tiger.lex.sml]
4263 :     ...
4264 :     [wrote CM/sparc-unix/semant.sml]
4265 :     [compiling (sources.cm):main.sml]
4266 :     [wrote CM/sparc-unix/main.sml]
4267 :     [New bindings added.]
4268 :     val it = true : bool
4269 :     - Main.compile ("../testcases/merge.tig", "foo.out");
4270 :     *** BACK-TRACE ***
4271 :     CALL lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trvar
4272 :     CALL lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
4273 :     CALL lib/semant.sml:289.3-295.22: SemantFun[2].transExp.trexp.check[2]
4274 :     GOTO lib/semant.sml:289.3-295.22: SemantFun[2].transExp.trexp.check[2]
4275 :     CALL lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
4276 :     CALL lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
4277 :     CALL lib/semant.sml:488.3-505.6: SemantFun[2].transDec.trdec[2].transBody[2]
4278 :     / lib/semant.sml:411.65-543.8: SemantFun[2].transDec
4279 :     CALL-\ lib/semant.sml:413.2-540.9: SemantFun[2].transDec.trdec[2]
4280 :     CALL lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
4281 :     CALL lib/semant.sml:8.52-558.4: SemantFun[2].transProg[2]
4282 :     CALL main.sml:1.18-118.4: Main.compile[2]
4283 :     -
4284 :    
4285 :     ----------------------------------------------------------------------
4286 : blume 673 Name: Matthias Blumen
4287 :     Date: 2000/06/21 18:00:00 JST
4288 :     Tag: blume-20000621-manual
4289 :     Description:
4290 :    
4291 :     CM manual update: Path environments documented.
4292 :    
4293 :     ----------------------------------------------------------------------
4294 : blume 666 Name: Matthias Blume
4295 : blume 672 Date: 2000/06/19 13:40:00
4296 :     Tag: blume-20000619-manual
4297 :     Description:
4298 :    
4299 :     CM manual and system/README update. This only covers the fact that
4300 :     there are no more implicit anchors. (Path environments and the "bind"
4301 :     option to "cm" have yet to be documented.)
4302 :    
4303 :     ----------------------------------------------------------------------
4304 :     Name: Matthias Blume
4305 : blume 671 Date: 2000/06/19 11:05:00 JST
4306 :     Tag: blume-20000619-chdir-bugfix
4307 :     Description:
4308 :    
4309 :     Fixed a bug in new SrcPath module that sometimes led to a bad chDir call.
4310 :    
4311 :     ----------------------------------------------------------------------
4312 :     Name: Matthias Blume
4313 : blume 670 Date: 2000/06/18 22:00:10 JST
4314 :     Tag: blume-20000618-implicit-anchors-really-gone
4315 :     Description:
4316 :    
4317 :     I updates the previous HISTORY entry where I forgot to mention that
4318 :     implicit anchors are no longer with us.
4319 :    
4320 :     The current update also gets rid of the (now useless) controller
4321 :     CM.Control.implicit_anchors.
4322 :    
4323 :     ----------------------------------------------------------------------
4324 :     Name: Matthias Blume
4325 : blume 666 Date: 2000/06/16 17:30:00 JST
4326 :     Tag: blume-20000616-anchorenv
4327 :     Description:
4328 :    
4329 :     This patch implements the long anticipated (just kidding :) "anchor
4330 :     environment" mechanism. In the course of doing this, I also
4331 :     re-implemented CM's internal "SrcPath" module from scratch. The new
4332 :     one should be more robust in certain boundary cases. In any case, it
4333 :     is a lot cleaner than its predecessor (IMHO).
4334 :    
4335 :     This time, although there is yet another boot file format change, I
4336 :     kept the unpickler backward-compatible. As a result, no new bootfiles
4337 :     are necessary and bootstrapping is straightforward. (You cannot read
4338 :     new bootfiles into an old system, but the other way around is no
4339 :     problem.)
4340 :    
4341 :     Visible changes:
4342 :    
4343 : blume 670 ** 0. Implicit path anchors (without the leading $-symbol) are no
4344 :     longer recognized at all. This means that such path names are not
4345 :     illegal either. For example, the name basis.cm simply refers to a
4346 :     local file called "basis.cm" (i.e, the name is an ordinary path
4347 :     relative to .cm-files directory). Or, to put it differently, only
4348 :     names that start with $ are anchored paths.
4349 : blume 666
4350 : blume 670 ** 1. The $<singlearc> abbreviation for $/<singlearc> has finally
4351 :     vanished.
4352 : &nbs