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Annotation of /sml/trunk/HISTORY

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1 : dbm 570 This is the HISTORY file for the Yale SML/NJ CVS repository.
2 :    
3 :     An entry should be made for _every_ commit to the repository.
4 :     The entries in this file will be used when creating the README
5 :     for new versions, so keep that in mind when writing the
6 :     description.
7 :    
8 :     The form of an entry should be:
9 :    
10 :     Name:
11 :     Date:
12 :     Tag: <post-commit CVS tag>
13 :     Description:
14 : george 824
15 : leunga 815 ----------------------------------------------------------------------
16 : blume 826 Name: Matthias Blume
17 : blume 833 Date: 2001/05/22 18:06:00 EDT
18 :     Tag: blume-20010522-targets
19 :     Description:
20 :    
21 :     Made install.sh use file config/targets.customized if it exists, falling
22 :     back to config/targets if it doesn't. This way one can have a customized
23 :     version of the targets file without touching the "real thing", thus
24 :     eliminating the constant fear of accidentally checking something bogus
25 :     back into the CVS repository... (File config/targets.customized must
26 :     not be added to the repository!)
27 :    
28 :     ----------------------------------------------------------------------
29 :     Name: Matthias Blume
30 : blume 832 Date: 2001/05/22 16:30:00 EDT
31 :     Tag: blume-20010522-minitut
32 :     Description:
33 :    
34 :     1. Bug fix in ml-nlffigen; now (hopefully) correctly handling
35 :     struct returns.
36 :     2. Added src/ml-nlffi-lib/Doc/mini-tutorial.txt. This is some very
37 :     incomplete, preliminary documentation for NLFFI.
38 :    
39 :     ----------------------------------------------------------------------
40 :     Name: Matthias Blume
41 : blume 829 Date: 2001/05/14 11:30:00 EDT
42 :     Tag: blume-20010514-script
43 :     Description:
44 :    
45 :     Some bugs in install script fixed.
46 :    
47 :     In addition to that I also made a slight change to the NLFFI API:
48 :     Functors generated by ml-nlffigen now take the dynamic library as a
49 :     straight functor argument, not as a suspended one. (The original
50 :     functor code used to force the suspension right away anyway, so there
51 :     was nothing gained by this complication of the interface.)
52 :    
53 :     ----------------------------------------------------------------------
54 :     Name: Matthias Blume
55 : blume 828 Date: 2001/05/11 14:35:00 EDT
56 :     Tag: blume-20010511-ml-nlffi
57 :     Description:
58 :    
59 :     I finally took the plunge and added my new FFI code to the main
60 :     repository. For x86-linux it is now ready for prime-time.
61 :    
62 :     There are two new subdirectories of "src":
63 :    
64 :     - ml-nlffi-lib:
65 :     The utility library for programs using the FFI interface.
66 :     Here is the implementation of $/c.cm and its associated low-level
67 :     partners $/c-int.cm and $/memory.cm.
68 :     - ml-nlffigen:
69 :     A stand-alone program for generating ML glue code from C source
70 :     code.
71 :    
72 :     Building ml-nlffigen requires $/ckit-lib.cm.
73 :    
74 :     The config/install.sh script has been updates to do the Right Thing
75 :     (hopefully).
76 :    
77 :     Notice that the source tree for the C-Kit will not be put under "src"
78 :     but directly under the installation root directory. (This is the
79 :     structure that currently exists on the CVS server when you check out
80 :     module "sml".) Fortunately, config/install.sh knows about this oddity.
81 :    
82 :     Bugs: No documentation yet.
83 :    
84 :     ----------------------------------------------------------------------
85 :     Name: Matthias Blume
86 : blume 826 Date: 2001/05/09 16:35:00 EDT
87 :     Tag: blume-20010509-cpscontract
88 :     Description:
89 :    
90 :     Fixed a bug in the accounting code in cpsopt/contract.sml. (The
91 :     wrapper/unwrapper elimination did not decrement usage counts and some
92 :     dead variables got overlooked by the dead-up logic.)
93 :    
94 :     ----------------------------------------------------------------------
95 : george 824 Name: Lal George
96 :     Date: 2001/05/08 17:26:09 EDT
97 :     Tag: george-20010508-omit-frameptr
98 :     Description:
99 :    
100 :     Changes to implement the omit-frame-pointer optimization to support
101 :     raw C calls. For now, there is only support on the Intel x86, but
102 :     other architectures will follow as more experience is gained with this.
103 :    
104 :    
105 :     ----------------------------------------------------------------------
106 : blume 818 Name: Matthias Blume
107 : blume 819 Date: 2001/05/07 14:40:00 EDT
108 :     Tag: blume-20010507-proxies
109 :     Description:
110 :    
111 :     I made into "proxy libraries" all libraries that qualify for such a
112 :     change. (A qualifying library is a library that has another library or
113 :     groups as its sole member and repeats that member's export list
114 :     verbatim. A proxy library avoids this repetition by omitting its export
115 :     list, effectively inheriting the list that its (only) member exports.
116 :     See the CM manual for more explanation.)
117 :     The main effect is that explicit export lists for these libraries
118 :     do not have to be kepts in sync, making maintenance a bit easier.
119 :    
120 :     I also added copyright notices to many .cm-files.
121 :    
122 :     Last but not least, I made a new set of bootfiles.
123 :    
124 :     ----------------------------------------------------------------------
125 :     Name: Matthias Blume
126 : blume 818 Date: 2001/05/04 17:00:00 EDT
127 :     Tag: blume-20010504-cm-lsplit
128 :     Description:
129 :    
130 :     0. John merged pending changes to $/smlnj-lib.cm
131 :    
132 :     1. Allen's previous change accidentally backed out of one of Lal's
133 :     earlier changes. I undid this mistake (re-introducing Lal's change).
134 :    
135 :     2. I used the new topOrder' function from graph-scc.sml (from $/smlnj-lib.cm)
136 :     within the compiler where applicable. There is some code simplification
137 :     because of that.
138 :    
139 :     3. The "split" phase (in FLINT) is now part of the default list of phases.
140 :     Compiler.Control.LambdaSplitting.* can be used to globally control the
141 :     lambda-splitting (cross-module-inlining) engine. In addition to that,
142 :     it can now also be controlled on a per-source basis: CM has been taught
143 :     a new tool parameter applicable to ML source files.
144 :    
145 :     - To turn lambda-splitting off completely:
146 :     local open Compiler.Control.LambdaSplitting in
147 :     val _ = set Off
148 :     end
149 :     - To make "no lambda-splitting" the global default (but allow per-source
150 :     overriding); this is the initial setting:
151 :     local open Compiler.Control.LambdaSplitting in
152 :     val _ = set (Default NONE)
153 :     end
154 :     - To make "lambda-splitting with aggressiveness a" the global default
155 :     (and allow per-source overriding):
156 :     local open Compiler.Control.LambdaSplitting in
157 :     val _ = set (Default (SOME a))
158 :     end
159 :    
160 :     - To turn lambda-splitting off for a given ML souce file (say: a.sml)
161 :     write (in the respective .cm-file):
162 :     a.sml (lambdasplitting:off)
163 :     - To turn lambda-splitting for a.sml on with minimal aggressiveness:
164 :     a.sml (lambdasplitting:on)
165 :     - To turn lambda-splitting for a.sml on with aggressiveness <a> (where
166 :     <a> is a decimal non-negative integer):
167 :     a.sml (lambdasplitting:<a>)
168 :     - To turn lambda-splitting for a.sml on with maximal aggressiveness:
169 :     a.sml (lambdasplitting:infinity)
170 :     - To use the global default for a.sml:
171 :     a.sml (lambdasplitting:default)
172 :     or simply
173 :     a.sml
174 :    
175 :     ----------------------------------------------------------------------
176 : leunga 815 Name: Allen Leung
177 :     Date: 2001/05/04 01:57:00 EDT
178 :     Tag: leunga-20010504-sync
179 :     Description:
180 : leunga 788
181 : leunga 815 MLRISC features.
182 :    
183 :     1. Fix to CMPXCHG instructions.
184 :     2. Changed RA interface to allow annotations in callbacks.
185 :     3. Added a new method to the stream interface to allow annotations updates.
186 :    
187 : george 749 ----------------------------------------------------------------------
188 : blume 812 Name: Matthias Blume
189 : blume 814 Date: 2001/05/01 11:45:00 EDT
190 :     Tag: blume-20010501-pcedittmp
191 :     Description:
192 :    
193 :     Changed install.sh to use the current working directory instead of
194 :     /usr/tmp for a temporary file (pcedittmp). The previous choice
195 :     of /usr/tmp caused trouble with MacOS X because of file premission
196 :     problems.
197 :    
198 :     ----------------------------------------------------------------------
199 :     Name: Matthias Blume
200 : blume 812 Date: 2001/04/20 11:10:00 EDT
201 :     Tag: blume-20010420-inMLflag
202 :     Description:
203 :    
204 :     - added vp_limitPtrMask to vproc-state.h
205 :     (for use by the raw-C-calls mechanism to implement proper interrupt
206 :     handling)
207 :     - made the ML compiler aware of various data-structure offsets so it
208 :     can generate code for accessing the vp_inML flag and vp_limitPtrMask
209 :     - tweaked mlriscGen.sml to have it emit interrupt-handling code for
210 :     raw C-calls
211 :    
212 :     ----------------------------------------------------------------------
213 : george 810 Name: Lal George
214 :     Date: 2001/04/20 09:15:28 EDT
215 :     Tag: george-20010420-macosX
216 :     Description:
217 :    
218 :     - Changes to port to Mac OS X; Darwin.
219 :    
220 :     - In the process I found that sqrt was broken on the PPC, because the
221 :     fsqrt instruction is not implemented.
222 :    
223 :     ----------------------------------------------------------------------
224 : blume 799 Name: Matthias Blume
225 : blume 808 Date: 2001/04/18 12:45:00 EDT
226 :     Tag: blume-20010418-ccalls
227 :     Description:
228 :    
229 :     - fixed two off-by-4 errors in the x86-specific c-calls implementation
230 :     (this bug prevented structure arguments containing pointers from being
231 :     passed correctly)
232 :     - changed the raw-C-call code in mlriscGen.sml in such a way that
233 :     structure arguments are represented as a pointer to the beginning
234 :     of the structure (instead of having a series of synthesized arguments,
235 :     one for each structure member)
236 :    
237 :     - made makeml script's verbosity level configurable via environment
238 :     variable (MAKEML_VERBOSITY)
239 :    
240 : blume 813 - eliminated placeholder implementations for f32l, w16s, i16s, and f32s
241 : blume 808 in rawmem-x86.sml; we are now using the real thing
242 :    
243 :     ----------------------------------------------------------------------
244 :     Name: Matthias Blume
245 : blume 806 Date: 2001/03/22 16:25:00 EST
246 :     Tag: blume-20010322-bootfiles
247 :     Description:
248 :    
249 :     Created a new set of bootfiles (for your automatic installation convenience).
250 :    
251 :     ----------------------------------------------------------------------
252 :     Name: Matthias Blume
253 : blume 805 Date: 2001/03/22 15:10:00 EST
254 :     Tag: blume-20010322-rawmem-parcm
255 :     Description:
256 :    
257 :     1. All "raw memory access" primitives for the new FFI are implemented now
258 :     (at least on the x86).
259 :     2. Some further cleanup of CM's parallel make mechanism.
260 :    
261 :     ----------------------------------------------------------------------
262 :     Name: Matthias Blume
263 : blume 801 Date: 2001/03/19 17:53:00 EST
264 :     Tag: blume-20010319-parallel
265 :     Description:
266 :    
267 :     Parallel make (using compile servers) now works again.
268 :    
269 :     To this end, CM.stabilize and CMB.make have been modified to work in
270 :     two passes when compile servers are attached:
271 :     1. Compile everything, do not perform stabilization; this pass
272 :     uses compile servers
273 :     2. Stabilize everything; this pass does not use compile servers
274 :     If there are no compile servers, the two passes are combined into one
275 :     (as before). Splitting the passes increases the inherent parallelism
276 :     in the dependency graph because the entire graph including all
277 :     libraries is available at the same time. This, in turn, improves
278 :     server utilization. The downside is that the master process will
279 :     have to do some extra work after compilation is done (because for
280 :     technical reasons it must re-read all the binfiles during stabilization).
281 :    
282 :     ----------------------------------------------------------------------
283 :     Name: Matthias Blume
284 : blume 800 Date: 2001/03/16 12:22:00 EST
285 :     Tag: blume-20010316-bootfiles
286 :     Description:
287 :    
288 :     Created a new set of bootfiles (for your automatic installation convenience).
289 :    
290 :     ----------------------------------------------------------------------
291 :     Name: Matthias Blume
292 : blume 799 Date: 2001/03/16 11:00:00 EST
293 :     Tag: blume-20010316-MLTREE-fixup
294 :     Description:
295 :    
296 :     This is a minor fixup for an (untagged) earlier commit by Allen.
297 :     (A file was missing).
298 :    
299 :     ----------------------------------------------------------------------
300 : leunga 788 Name: Allen Leung
301 : leunga 796 Date: Mon Mar 5 18:54:57 EST 2001
302 :     Tag: leunga-20010305-cut-support
303 :    
304 :     1. New support for alternative control-flow in MLTREE.
305 :     Currently we support
306 :    
307 :     FLOW_TO(CALL ...., [k1,...,kn])
308 :    
309 :     This is needed for 'cuts to' in C-- and try/handle-like constructs
310 :     in Moby
311 :    
312 :     New assembler flag "asm-show-cutsto" to turn on control-flow debugging.
313 :    
314 :     2. Register Allocator
315 :    
316 :     Changes in interface [from Fermin, John]
317 :    
318 :     3. Alpha 8-bit SLL support [Fermin]
319 :    
320 :     4. All architectures
321 :    
322 :     A new module (ClusterExpandCopies) for expanding parallel copies.
323 :    
324 :     ----------------------------------------------------------------------
325 :     Name: Allen Leung
326 : leunga 788 Date: 2001/02/27 23:07:00 EST
327 :     Tag: leunga-20010227-minor-stuff
328 :    
329 :     1. Alpha bug fix for CMOVNE
330 :     2. Handle mltree COND(..,FCMP ...,...)
331 :     3. Bug fix in simplifier
332 :    
333 :     ----------------------------------------------------------------------
334 : blume 777 Name: Matthias Blume
335 : blume 781 Date: 2001/01/30 17:50:00 EST
336 :     Tag: blume-20010130-sync
337 :     Description:
338 :    
339 :     This is just a minor update to sync my devel branch with the main brach.
340 :     The only visible change is the addition of some README files.
341 :    
342 :     ----------------------------------------------------------------------
343 :     Name: Matthias Blume
344 : blume 778 Date: 2001/01/12 23:30:00 JST
345 :     Tag: blume-20010112-bootfiles
346 :     Description:
347 :    
348 :     Made a new set of bootfiles that goes with the current state of the
349 :     repository.
350 :    
351 :     ----------------------------------------------------------------------
352 :     Name: Matthias Blume
353 : blume 777 Date: 2001/01/12 21:20:00 JST
354 :     Tag: blume-20010112-sync
355 :     Description:
356 :    
357 :     I am just flushing out some minor changes that had accumulated in
358 :     my private branch in order to sync with the main tree. (This is
359 :     mainly because I had CVS trouble when trying to merge _into_ my
360 :     private branch.)
361 :    
362 :     Most people should be completely unaffected by this.
363 :    
364 :     ----------------------------------------------------------------------
365 : leunga 775 Name: Allen Leung
366 :     Date: Thu Jan 11 21:03:00 EST 2001
367 :     Tag: leunga-20010111-labexp=mltree
368 :     Description:
369 :    
370 :     1. Removed the type LabelExp and replace it by MLTree.
371 :     2. Rewritten mltree-simplify with the pattern matcher tool.
372 :     3. There were some bugs in alpha code generator which would break
373 :     64-bit code generation.
374 :     4. Redo the tools to generate code with the
375 :     5. The CM files in MLRISC (and in src/system/smlnj/MLRISC)
376 :     are now generated by perl scripts.
377 :    
378 :     ----------------------------------------------------------------------
379 : blume 771 Name: Matthias Blume
380 : blume 774 Date: 2001/01/10 21:55:00 JST
381 :     Tag: blume-20010110-rcc
382 :     Description:
383 :    
384 :     The RCC stuff now seems to work (but only on the x86).
385 :     This required hacking of the c-calls interface (and -implementation) in
386 :     MLRISC.
387 :    
388 :     Normal compiler users should be unaffected.
389 :    
390 :     ----------------------------------------------------------------------
391 :     Name: Matthias Blume
392 : blume 773 Date: 2001/01/09 01:20:00 JST
393 :     Tag: blume-20010109-rcc
394 :     Description:
395 :    
396 :     This is a fairly big patch, flushing out a large number of pending
397 :     changes that I made to my development copy over the last couple of days.
398 :    
399 :     Of practical relevance at this moment is a workaround for a pickling
400 :     bug that Allen ran into the other day. The cause of the bug itself is
401 :     still unknown and it might be hard to fix it properly, but the
402 :     workaround has some merits of its own (namely somewhat reducing pickling
403 :     overhead for certain libraries). Therefore, I think this solution should
404 :     be satisfactory at this time.
405 :    
406 :     The rest of the changes (i.e., the vast majority) has to do with my
407 :     ongoing efforts of providing direct support for C function calls from
408 :     ML. At the moment there is a new primop "RAW_CCALL", typing magic
409 :     in types/cproto.sml (invoked from FLINT/trans/translate.sml), a new
410 :     case in the FLINT CPS datatype (RCC), changes to cps/convert.sml to
411 :     translate uses of RAW_CCALL into RCC, and changes to mlriscGen.sml to
412 :     handle RCC.
413 :    
414 :     The last part (the changes to mlriscGen.sml) are still known to be
415 :     wrong on the x86 and not implemented on all other architectures. But
416 :     the infrastructure is in place. I had to change a few functor
417 :     signatures in the backend to be able to route the CCalls interface
418 :     from MLRISC there, and I had to specialize the mltree type (on the
419 :     x86) to include the necessary extensions. (The extensions themselves
420 :     were already there and redy to go in MLRISC/x86).
421 :    
422 :     Everything should be very happy as soon as someone helps me with
423 :     mlriscGen.sml...
424 :    
425 :     In any case, nothing of this should matter to anyone as long as the
426 :     new primop is not being used (which is going to be the case unless you
427 :     find it where I hid it :). The rest of the compiler is completely
428 :     unaffected.
429 :    
430 :     ----------------------------------------------------------------------
431 :     Name: Matthias Blume
432 : blume 772 Date: 2001/01/05 00:30:00 JST
433 :     Tag: blume-20010105-primops
434 :     Description:
435 :    
436 :     Added some experimental support for work that I am doing right now.
437 :     These changes mostly concern added primops, but there is also a new
438 :     experimental C library in the runtime system (but currently not enabled
439 :     anywhere except on Linux/X86).
440 :    
441 :     In the course of adding primops (and playing with them), I discovered that
442 :     Zhong's INL_PRIM hack (no type info for certain primops) was, in fact, badly
443 :     broken. (Zhong was very right he labeled this stuff as "major gross hack".)
444 :     To recover, I made type information in INL_PRIM mandatory and changed
445 :     prim.sml as well as built-in.sml accordingly. The InLine structure now
446 :     has complete, correct type information (i.e., no bottom types).
447 :    
448 :     Since all these changes mean that we need new binfiles, I also bumped the
449 :     version number to 110.32.1.
450 :    
451 :     ----------------------------------------------------------------------
452 :     Name: Matthias Blume
453 : blume 771 Date: 2000/12/30 22:10:00 JST
454 :     Tag: blume-20001230-various
455 :     Description:
456 :    
457 :     Added proxy libraries for MLRISC and let MLRISC libraries refer
458 :     to each other using path anchors. (See CM manual for explanation.)
459 :    
460 :     Updated CM documentation.
461 :    
462 :     Fixed some bugs in CM.
463 :    
464 :     Implemented "proxy" libraries (= syntactic sugar for CM).
465 :    
466 :     Added "-quiet" option to makeml and changed runtime system accordingly.
467 :    
468 :     Added cleanup handler for exportML to reset timers and compiler stats.
469 :    
470 :     ----------------------------------------------------------------------
471 : george 761 Name: Lal George
472 :     Date: 2000/12/22 22:22:58 EST 2000
473 :     Tag: Release_110_32
474 :     Description:
475 :    
476 :     Infinite precision used throughout MLRISC.
477 :     see MLRISC/mltree/machine-int.sig
478 :    
479 :     ----------------------------------------------------------------------
480 : blume 756 Name: Matthias Blume
481 : blume 760 Date: 2000/12/22 23:16:00 JST
482 :     Tag: blume-20001222-warn
483 :     Description:
484 : blume 759
485 : blume 760 Corrected wording and formatting of some CM warning message which I
486 :     broke in my previous patch.
487 : blume 759
488 :     ----------------------------------------------------------------------
489 :     Name: Matthias Blume
490 : blume 763 Date: 2000/12/22 21:20:00 JST
491 :     Tag: blume-20001222-anchorenv
492 :     Description:
493 :    
494 :     Fixed CM's handling of anchor environments in connection with CMB.make.
495 :    
496 :     ----------------------------------------------------------------------
497 :     Name: Matthias Blume
498 : blume 758 Date: 2000/12/22 13:15:00 JST
499 :     Tag: blume-20001222-cleanup
500 :     Description:
501 :    
502 :     Removed src/cm/ffi which does not (and did not) belong here.
503 :    
504 :     ----------------------------------------------------------------------
505 :     Name: Matthias Blume
506 : blume 757 Date: 2000/12/21 23:55:00 JST
507 :     Tag: blume-20001221-exn
508 :     Description:
509 :    
510 :     Probably most important: CM no longer silently swallows all exceptions
511 :     in the compiler.
512 :     Plus: some other minor CM changes. For example, CM now reports some
513 :     sizes for generated binfiles (code, data, envpickle, lambdapickle).
514 :    
515 :     ----------------------------------------------------------------------
516 :     Name: Matthias Blume
517 : blume 756 Date: 2000/12/15 00:01:05 JST
518 :     Tag: blume-20001215-dirtool
519 :     Description:
520 :    
521 :     - "dir" tool added.
522 :     - improvements and cleanup to Tools structure
523 :     - documentation updates
524 :    
525 :     ----------------------------------------------------------------------
526 : leunga 752 Name: Allen Leung
527 : leunga 755 Date: Thu Dec 14 03:45:24 EST 2000
528 :     Description:
529 :     Tag: leunga-20001214-int-inf
530 :     Description:
531 :    
532 :     In IntInf, added these standard functions, which are missing from our
533 :     implementation:
534 :    
535 :     andb : int * int -> int
536 :     xorb : int * int -> int
537 :     orb : int * int -> int
538 :     notb : int -> int
539 :     << : int * word -> int
540 :     ~>> : int * word -> int
541 :    
542 :     Not tested, I hope they are correct.
543 :    
544 :     ----------------------------------------------------------------------
545 :     Name: Allen Leung
546 : leunga 752 Date: Fri Dec 8 19:23:26 EST 2000
547 :     Description:
548 :     Tag: leunga-20001208-nowhere
549 :     Description:
550 :    
551 :     Slight improvements to the 'nowhere' tool to handle OR-patterns,
552 :     to generate better error messages etc. Plus a brief manual.
553 :    
554 :     ----------------------------------------------------------------------
555 : george 749 Name: Lal George
556 :     Date: 2000/12/08 09:54:02 EST 2000
557 :     Tag: Release_110_31
558 :     Description:
559 : george 705
560 : george 749 - Version 110.31
561 : leunga 591 ----------------------------------------------------------------------
562 : leunga 744 Name: Allen Leung
563 :     Date: Thu Dec 7 22:01:04 EST 2000
564 :     Tag: leunga-20001207-cell-monster-hack
565 :     Description:
566 :    
567 :     Major MLRISC internal changes. Affect all clients.
568 :     Summary:
569 :    
570 :     1. Type CELLS.cell = int is now replaced by a datatype.
571 :     As a result, the old regmap is now gone. Almost all interfaces
572 :     in MLRISC change as a consequence.
573 :    
574 :     2. A new brand version of machine description tool (v3.0) that generates
575 :     modules expecting the new interface. The old version is removed.
576 :    
577 :     3. The RA interface has been further abstracted into two new functors.
578 :     RISC_RA and X86RA. These functors have much simpler interfaces.
579 :     [See also directory MLRISC/demo.]
580 :    
581 :     4. Some other new source->source code generation tools are available:
582 :    
583 :     a. MLRISC/Tools/RewriteGen -- generate rewriters from rules.
584 :     b. MLRISC/Tools/WhereGen -- expands conditional pattern matching rules.
585 :     I use this tool to generate the peephole optimizers---with the new
586 :     cell type changes, peephole rules are becoming difficult to write
587 :     without conditional pattern matching.
588 :    
589 :     5. More Intmap -> IntHashTable change. Previous changes by Matthias didn't
590 :     cover the entire MLRISC source tree so many things broke.
591 :    
592 :     6. CM files have been moved to the subdirectory MLRISC/cm.
593 :     They are moved because there are a lot of them and they clutter up the
594 :     root dir.
595 :    
596 :     7. More detailed documentation to come...
597 :    
598 :     NOTE: To rebuild from 110.30 (ftp distribution), you'll have to do
599 :     a makeml -rebuild first. This is because of other other
600 :     changes that Matthias has made (see below).
601 :    
602 :    
603 :     ----------------------------------------------------------------------
604 : blume 733 Name: Matthias Blume
605 : blume 742 Date: 2000/11/30 23:12:00 JST
606 :     Tag: blume-20001130-filereorg
607 :     Description:
608 :    
609 :     Some manual updates and some file reorganizations in CM.
610 :    
611 :     ----------------------------------------------------------------------
612 :     Name: Matthias Blume
613 : blume 737 Date: 2000/11/24 17:45:00 JST
614 :     Tag: blume-20001124-link
615 :     Description:
616 :    
617 :     Drastically improved link traversal code for the case that the dynamic
618 :     value was already loaded at bootstrap time. As a result, CM and CMB
619 :     now both load blazingly fast -- even on a very slow machine. Also,
620 :     memory consumption has been further reduced by this.
621 :    
622 :     Warning: The format of the PIDMAP file has changed. THerefore, to
623 :     bootstrap you have to do this:
624 :    
625 :     1. Run CMB.make
626 :     2. Make a symbolic link for the boot directory:
627 :     ln -s sml.boot.ARCH-OS xxx
628 :     3. "Rebuild" the boot directory:
629 :     ./makeml -boot xxx -rebuild sml ; rm xxx
630 :     4. Boot normally:
631 :     ./makeml
632 :    
633 :     ----------------------------------------------------------------------
634 :     Name: Matthias Blume
635 : blume 735 Date: 2000/11/21 21:20:00 JST
636 :     Tag: blume-20001121-tools
637 :     Description:
638 :    
639 :     Continued hacking on autoloading problem -- with success this time.
640 :     Also changed tool-plugin mechanism. See new CM manual.
641 :    
642 :     ----------------------------------------------------------------------
643 :     Name: Matthias Blume
644 : blume 734 Date: 2000/11/19 14:30:00 JST
645 :     Tag: blume-20001119-autoload
646 :     Description:
647 :    
648 :     Some hacking to make autoloading faster. Success for CMB, no success
649 :     so far for CM. There is a reduced structure CM' that autoloads faster.
650 :     (This is a temporary, non-documented hack to be eliminated again when
651 :     the general problem is solved.)
652 :    
653 :     ----------------------------------------------------------------------
654 :     Name: Matthias Blume
655 : blume 733 Date: 2000/11/17 14:10:00 JST
656 :     Tag: blume-20001117-pickle-lib
657 :     Description:
658 :    
659 :     1. Eliminated comp-lib.cm
660 :     2. Made pickle-lib.cm
661 :     3. Eliminated all uses of intset.sml (from comp-lib.cm)
662 :     4. Replaced all uses of intmap.{sig,sml} (from comp-lib.cm) with
663 :     equivalent constructs from smlnj-lib.cm (INtHashTable).
664 :     5. Point 4. also goes for those uses of intmap.* in MLRISC.
665 :     Duplicated intmap modules thrown out.
666 :     6. Hunted down all duplicated SCC code and replaced it with
667 :     equivalent stuff (GraphSCCFn from smlnj-lib.cm).
668 :     7. Rewrote Feedback module.
669 :     8. Moved sortedlist.sml into viscomp-lib.cm. Eventually it
670 :     should be thrown out and equivalent modules from smlnj-lib.cm
671 :     should be used (IntRedBlackSet, IntListSet, ...).
672 :    
673 :     Confirmed that compiler compiles to fixpoint.
674 :    
675 :     ----------------------------------------------------------------------
676 : leunga 731 Name: Allen Leung
677 :     Date: 2000/11/10 18:00:00
678 :     Tag: leunga-20001110-new-x86-fp
679 :    
680 :     A new x86 floating point code generator has been added.
681 :     By default this is turned off. To turn this on, do:
682 :    
683 :     CM.autoload "$smlnj/compiler.cm";
684 :     Compiler.Control.MLRISC.getFlag "x86-fast-fp" := true;
685 :    
686 :     Changes:
687 :    
688 :     1. Changed FTAN to FPTAN so that the assembly output is correct.
689 :     2. Changed the extension callback for FTANGENT to generate:
690 :    
691 :     fptan
692 :     fstp %st(0)
693 :     instead of
694 :     fptan
695 :     fstpl ftempmem
696 :    
697 :     3. Numerous assembly fixes for x86.
698 :    
699 :     5. Cleaned up the machine code output module x86/x86MC.sml and added
700 :     support for a whole bunch of instructions and addressing modes:
701 :    
702 :     fadd/fsub/fsubr/fmul/fdiv/fdivr %st, %st(n)
703 :     faddp/fsubp/fsubrp/fmulp/fdivp/fdivrp %st, %st(n)
704 :     fadd/fsub/fsubr/fmul/fdiv/fdivr %st(n), %st
705 :     fiadd/fisub/fisubr/fimul/fidiv/fidivr mem
706 :     fxch %st(n)
707 :     fld %st(n)
708 :     fst %st(n)
709 :     fst mem
710 :     fstp %st(n)
711 :     fucom %st(n)
712 :     fucomp %st(n)
713 :    
714 :     All these are now generated when the fast fp mode is turned on.
715 :    
716 :     6. Removed the dedicated registers %st(0), ..., %st(7) from X86CpsRegs
717 :    
718 :     ----------------------------------------------------------------------
719 : blume 729 Name: Matthias Blume
720 :     Date: 2000/11/09 11:20:00 JST
721 :     Tag: blume-20001109-scc
722 :     Description:
723 :    
724 :     Eliminated some code duplication:
725 :    
726 :     1. Added "where" clause to GraphSCCFn in SML/NJ Library.
727 :     (Otherwise the functor is useless.)
728 :     2. Used GraphSCCFn where SCCUtilFun was used previously.
729 :     3. Got rid of SCCUtilFun (in comp-lib.cm).
730 :    
731 :     ----------------------------------------------------------------------
732 : george 721 Name: Lal George
733 :     Date: 2000/11/06 09:02:21 EST 2000
734 :     Tag: Release_110_30
735 :     Description:
736 :    
737 :     - Version 110.30
738 :     ----------------------------------------------------------------------
739 : blume 715 Name: Matthias Blume
740 : blume 716 Date: 2000/11/04 14:45:00
741 :     Tag: blume-20001104-mlbuild
742 :     Description:
743 :    
744 :     - Made ml-build faster on startup.
745 :     - Documentation fixes.
746 :    
747 :     ----------------------------------------------------------------------
748 :     Name: Matthias Blume
749 : blume 715 Date: 2000/11/02 17:00:00 JST
750 :     Tag: blume-20001102-condcomp
751 :     Description:
752 :    
753 :     - Small tweaks to pickler -- new BOOTFILES!
754 :     - Version bumped to 110.29.2.
755 :     - Added conditional compilation facility to init.cmi (see comment there).
756 :     ----------------------------------------------------------------------
757 : leunga 713 Name: Allen Leung
758 :     Date: 2000/10/23 19:31:00
759 :     Tag: leunga-20001023-demo-ra
760 :    
761 :     1. Minor RA changes that improves spilling on x86 (affects Moby and C-- only)
762 :     2. Test programs for the graph library updated
763 :     3. Some new MLRISC demo programs added
764 :    
765 :     ----------------------------------------------------------------------
766 : blume 710 Name: Matthias Blume
767 : blume 711 Date: 2000/08/31 22:15:00 JST
768 :     Tag: blume-20001017-errmsg
769 :     Description:
770 :    
771 :     More error message grief: Where there used to be no messages, there
772 :     now were some that had bogus error regions. Fixed.
773 :    
774 :     ----------------------------------------------------------------------
775 :     Name: Matthias Blume
776 : blume 710 Date: 2000/08/31 17:30:00 JST
777 :     Tag: blume-20001017-v110p29p1
778 :     Description:
779 :    
780 :     I made a version 110.29.1 with new bootfiles.
781 :    
782 :     Changes: Modified pickler/unpickler for faster and leaner unpickling.
783 :     CM documentation changes and a small bugfix in CM's error reporting.
784 :    
785 :     ----------------------------------------------------------------------
786 : george 705 Name: Lal George
787 :     Date: 2000/09/27 14:42:35 EDT
788 :     Tag: george-20000927-nodestatus
789 :     Description:
790 :    
791 :     Changed the type of the nodestatus, so that:
792 :    
793 :     SPILLED(~1) is now SPILLED
794 :     SPILLED(m) where m>=0 is now MEMREG(m)
795 :     SPILLED(s) where s<~1 is now SPILL_LOC(~s)
796 :    
797 :     ----------------------------------------------------------------------
798 : blume 697 Name: Matthias Blume
799 : blume 703 Date: 2000/09/07 14:45:00 JST
800 :     Tag: blume-20000907-cmerrmsg
801 :     Description:
802 :    
803 :     Small tweak to CM to avoid getting ML syntax error messages twice.
804 :    
805 :     ----------------------------------------------------------------------
806 :     Name: Matthias Blume
807 : blume 701 Date: 2000/08/31 18:00:00 JST
808 :     Tag: blume-20000831-cvsbootfiles
809 :     Description:
810 :    
811 :     New URL for boot files (because the 110.29 files on the BL server do
812 :     now work correctly with my updated install scripts for yacc and lex).
813 :    
814 :     ----------------------------------------------------------------------
815 :     Name: Matthias Blume
816 : blume 697 Date: 2000/08/08 12:33:00 JST
817 :     Tag: blume-20000808-manual
818 :     Description:
819 :    
820 :     Tiny update to CM manual.
821 :    
822 :     ----------------------------------------------------------------------
823 : leunga 695 Name: Allen Leung
824 :     Date: 2000/08/7 19:31:00
825 :     Tag: leunga-20000807-a-whole-bunch-of-stuff
826 :    
827 :     Moby, C--, SSA, x86, machine descriptions etc. Should only affect C--
828 :     and Mobdy.
829 :    
830 :     1. x86
831 :    
832 :     a. Fixes to peephole module by John and Dan.
833 :     b. Assembly fix to SETcc by Allen.
834 :     c. Fix to c-call by John.
835 :     d. Fix to spilling by John. (This one deals with the missing FSTPT case)
836 :     e. Instruction selection optimization to SETcc as suggested by John.
837 :    
838 :     For example,
839 :    
840 :     MV(32, x, COND(32, CMP(32, LT, a, b), LI 1, LI 0))
841 :    
842 :     should generate:
843 :    
844 :     MOVL a, x
845 :     SUBL b, x
846 :     SHRL 31, x
847 :    
848 :     2. IR stuff
849 :    
850 :     A bunch of new DJ-graph related algorithms added. These
851 :     speed up SSA construction.
852 :    
853 :     3. SSA + Scheduling
854 :    
855 :     Added code for SSA and scheduling to the repository
856 :    
857 :     ----------------------------------------------------------------------
858 : george 694 Name: Lal George
859 :     Date: 2000/07/27 11:53:14 EDT
860 :    
861 :     Tag: lal-20000727-linux-ppc
862 :     Description:
863 :    
864 :     Made changes to support Linux PPC.
865 :     p.s. I have confirmation that the 110.29 boot files work fine.
866 :    
867 :     ----------------------------------------------------------------------
868 : blume 684 Name: Matthias Blume
869 : blume 692 Date: 2000/07/27 17:40:00 JST
870 :     Tag: blume-20000727-scripts
871 :     Description:
872 :    
873 :     !!!! WARNING !!!!
874 :     You must recompile the runtime system!
875 :     !!!! WARNING !!!!
876 :    
877 :     This is basically another round of script-enhancements:
878 :    
879 :     1. sml, ml-build, and ml-makedepend accept options -D and -U to define
880 :     and undefine CM preprocessor symbols.
881 :    
882 :     2. ml-build avoids generating a new heap image if it finds that the
883 :     existing one is still ok. (The condition is that no ML file had to
884 :     be recompiled and all ML files are found to be older that the heap
885 :     file.)
886 :    
887 :     To make this work smoothly, I also hacked the runtime system as
888 :     well as SMLofNJ.SysInfo to get access to the heap image suffix
889 :     (.sparc-solaris, ...) that is currently being used.
890 :    
891 :     Moreover, the signature of CM.mk_standalone has changed. See the
892 :     CM manual.
893 :    
894 :     3. ml-makedepend accepts additional options -n, -a, and -o. (See the
895 :     CM manual for details.)
896 :    
897 :     4. More CM manual updates:
898 :     - all of the above has been documented.
899 :     - there is now a section describing the (CM-related) command line
900 :     arguments that are accepted by the "sml" command
901 :    
902 :     ----------------------------------------------------------------------
903 :     Name: Matthias Blume
904 : blume 691 Date: 2000/07/25 16:20:00 JST
905 :     Tag: blume-20000725-makedepend
906 :     Description:
907 :    
908 :     Added a script called ml-makedepend. This can be used in makefiles
909 :     for Unix' make in a way very similar to the "makedepend" command for
910 :     C.
911 :    
912 :     The script internally uses function CM.sources.
913 :    
914 :     Synopsis:
915 :    
916 :     ml-makedepend [-f makefile] cmfile targetname
917 :    
918 :     The default for the makefile is "makefile" (or "Makefile" should
919 :     "makefile" not exist).
920 :    
921 :     ml-makedepend adds a cmfile/targetname-specific section to this
922 :     makefile (after removing the previous version of this section). The
923 :     section contains a single dependency specification with targetname on
924 :     the LHS (targetname is an arbitrary name), and a list of files derived
925 :     from the cmfile on the RHS. Some of the files on the RHS are
926 :     ARCH/OPSYS-specific. Therefore, ml-makedepend inserts references to
927 :     "make" variables $(ARCH) and $(OPSYS) in place of the corresponding
928 :     path names. The makefile writer is responsible for making sure that
929 :     these variables have correct at the time "make" is invoked.
930 :    
931 :     ----------------------------------------------------------------------
932 :     Name: Matthias Blume
933 : blume 690 Date: 2000/07/22 23:30:00 JST
934 :     Tag: blume-20000722-urlupdate
935 :     Description:
936 :    
937 :     Changed BOOT and config/srcarchiveurl to point to BL server:
938 :    
939 :     ftp://ftp.research.bell-labs.com/dist/smlnj/working/110.29/
940 :    
941 :     ----------------------------------------------------------------------
942 :     Name: Matthias Blume
943 : blume 686 Date: 2000/07/18 18:00:00 JST
944 :     Tag: blume-20000718-Version_110_29
945 :     Description:
946 :    
947 :     1. Updated src/compiler/TopLevel/main/version.sml to version 110.29
948 :    
949 :     2. Updated config/version to 110.29
950 :    
951 :     3. Updated config/srcarchiveurl
952 :    
953 :     3. New boot files!
954 :     ftp://ftp.cs.princeton.edu/pub/people/blume/sml/110.29-autofetch
955 :    
956 :     ----------------------------------------------------------------------
957 :     Name: Matthias Blume
958 : blume 684 Date: 2000/07/11 13:58:00 JST
959 :     Tag: blume-20000711-doctypo
960 :     Description:
961 :    
962 :     Fixed a few typos in CM manual.
963 :    
964 :     ----------------------------------------------------------------------
965 : leunga 683 Name: Allen Leung
966 :     Date: 2000/06/15 00:38:00
967 :     Tag: leunga-20000704-sparc-x86
968 :    
969 :     1. x86 peephole improvement sp += k; sp -= k => nop [from John]
970 :     2. fix to x86 RET bug [found by Dan Grossman]
971 :     3. sparc assembly bug fix for ticc instructions [found by Fermin]
972 :    
973 :     Affects c-- and moby only
974 :    
975 :     ----------------------------------------------------------------------
976 : blume 680 Name: Matthias Blume
977 : blume 682 Date: 2000/07/04 15:26:00
978 :     Tag: blume-20000704-trigger
979 :     Description:
980 :    
981 :     1. Improvements to CM manual.
982 :     2. SMLofNJ.Internals.BTrace.trigger reinstated as an alternative way
983 :     of getting a back-trace. The function, when called, raises an
984 :     internal exception which explicitly carries the full back-trace history,
985 :     so it is unaffected by any intervening handle-raise pairs ("trivial"
986 :     or not). The interactive loop will print that history once it arrives
987 :     at top level.
988 :     Short of having all exceptions implicitly carry the full history, the
989 :     recommended way of using this facility is:
990 :     - compile your program with instrumentation "on"
991 :     - run it, when it raises an exception, look at the history
992 :     - if the history is "cut off" because of some handler, go and modify
993 :     your program so that it explicitly calls BTrace.trigger
994 :     - recompile (still instrumented), and rerun; look at the full history
995 :    
996 :     ----------------------------------------------------------------------
997 :     Name: Matthias Blume
998 :     Date: 2000/07/03 15:36:00 JST
999 : blume 680 Tag: blume-20000702-manual
1000 :     Description:
1001 :    
1002 :     Small corrections and updates to CM manual.
1003 :    
1004 :     ----------------------------------------------------------------------
1005 : blume 682 Name: Matthias Blume
1006 : blume 679 Date: 2000/06/29 16:04:00 JST
1007 :     Tag: blume-20000629-yacctool
1008 :     Description:
1009 :    
1010 :     Changes:
1011 :    
1012 :     1. Class "mlyacc" now takes separate arguments to pass options to
1013 :     generated .sml- and .sig-files independently.
1014 :     2. Corresponding CM manual updates.
1015 :     3. BTrace module now also reports call sites. (However, for loop clusters
1016 :     it only shows from where the cluster was entered.) There are associated
1017 :     modifications to core.sml, internals.{sig,sml}, btrace.sml, and btimp.sml.
1018 :    
1019 :     ----------------------------------------------------------------------
1020 : blume 675 Name: Matthias Blume
1021 : blume 678 Date: 2000/06/27 16:51:00 JST
1022 :     Tag: blume-20000627-noweb
1023 :     Description:
1024 :    
1025 :     Changes:
1026 :    
1027 :     1. Implemented "subdir" and "witness" options for noweb tool.
1028 :     This caused some slight internal changes in CM's tool implementation.
1029 :     2. Fixed bug in "tool plugin" mechanism. This is essentially cleaning
1030 :     some remaining issues from earlier path anchor changes.
1031 :     3. Updated CM manual accordingly.
1032 :    
1033 :     4. Changed implementation of back-tracing so that I now consider it
1034 :     ready for prime-time.
1035 :    
1036 :     In particular, you don't have to explicitly trigger the back-trace
1037 :     anymore. Instead, if you are running BTrace-instrumented code and
1038 :     there is an uncaught exception (regardless of whether or not it was
1039 :     raised in instrumented code), the top-level evalloop will print
1040 :     the back-trace.
1041 :    
1042 :     Features:
1043 :    
1044 :     - Instrumented and uninstrumented code work together seemlessly.
1045 :     (Of course, uninstrumented code is never mentioned in actual
1046 :     back-traces.)
1047 :    
1048 :     - Asymptotic time- and space-complexity of instrumented code is
1049 :     equal to that of uninstrumented code. (This means that
1050 :     tail-recursion is preserved by the instrumentation phase.)
1051 :    
1052 :     - Modules whose code has been instrumented in different sessions
1053 :     work together without problem.
1054 :    
1055 :     - There is no penalty whatsoever on uninstrumented code.
1056 :    
1057 :     - There is no penalty on "raise" expressions, even in
1058 :     instrumented code.
1059 :    
1060 :     A potential bug (or perhaps it is a feature, too):
1061 :    
1062 :     A back-trace reaches no further than the outermost instrumented
1063 :     non-trivial "raise". Here, a "trivial" raise is one that is the
1064 :     sole RHS of a "handle" rule. Thus, back-traces reach trough
1065 :    
1066 :     <exp> handle e => raise e
1067 :    
1068 :     and even
1069 :    
1070 :     <exp> handle Foo => raise Bar
1071 :    
1072 :     and, of course, through
1073 :    
1074 :     <exp> handle Foo => ...
1075 :    
1076 :     if the exception was not Foo.
1077 :    
1078 :     Back-traces always reach right through any un-instrumented code
1079 :     including any of its "handle" expressions, trivial or not.
1080 :    
1081 :     To try this out, do the following:
1082 :    
1083 :     - Erase all existing binfiles for your program.
1084 :     (You may keep binfiles for those modules where you think you
1085 :     definitely don't need back-tracing.)
1086 :     - Turn on back-trace instrumentation:
1087 :     SMLofNJ.Internals.BTrace.mode (SOME true);
1088 :     - Recompile your program. (I.e., run "CM.make" or "use".)
1089 :     - You may now turn instrumentation off again (if you want):
1090 :     SMLofNJ.Internals.BTrace.mode (SOME false);
1091 :     - Run your program as usual. If it raises an exception that
1092 :     reaches the interactive toplevel, then a back-trace will
1093 :     automatically be printed. After that, the toplevel loop
1094 :     will print the exception history as usual.
1095 :    
1096 :     ----------------------------------------------------------------------
1097 :     Name: Matthias Blume
1098 : blume 677 Date: 2000/06/26 09:56:46 JST
1099 :     Tag: blume-20000626-setup
1100 :     Description:
1101 :    
1102 :     CM: - setup-parameter to "sml" added; this can be used to run arbitrary
1103 :     ML code before and after compiling a file (e.g., to set compiler
1104 :     flags)
1105 :    
1106 :     Compiler: - improved btrace API (in core.sml, internals.{sig,sml})
1107 :     - associated changes to btrace.sml (BTrace instrumentation pass)
1108 :     - cleaner implementation of btimp.sml (BTrace tracing and report
1109 :     module)
1110 :    
1111 :     CM manual: * new path encoding documented
1112 :     * description of setup-parameter to "sml" added
1113 :    
1114 :     The biggest user-visible change to back-tracing is that it is no
1115 :     longer necessary to compile all traced modules within the same
1116 :     session. (This was a real limitation.)
1117 :    
1118 :     ----------------------------------------------------------------------
1119 :     Name: Matthias Blume
1120 : blume 676 Date: 2000/06/24 12:40:00 JST
1121 :     Tag: blume-20000624-startup
1122 :     Description:
1123 :    
1124 :     Fixes startup slowdown problem. (I was calling SrcPath.sync a _tad_
1125 :     bit too often -- to put it mildly. :)
1126 :    
1127 :     ----------------------------------------------------------------------
1128 :     Name: Matthias Blume
1129 : blume 675 Date: 2000/06/23 18:20:00 JST
1130 :     Tag: blume-20000623-btrace
1131 :     Description:
1132 :    
1133 :     This updates adds a backtrace facility to aid programmers in debugging
1134 :     their programs. This involves the following changes:
1135 :    
1136 :     1. Module system/smlnj/init/core.sml (structure _Core) now has hooks for
1137 :     keeping track of the current call stack. When programs are compiled
1138 :     in a special mode, the compiler will insert calls to these hooks
1139 :     into the user program.
1140 :     "Hook" means that it is possible for different implementations of
1141 :     back-tracing to register themselves (at different times).
1142 :    
1143 :     2. compiler/MiscUtil/profile/btrace.sml implements the annotation phase
1144 :     as an Absyn.dec->Absyn.dec rewrite. Normally this phase is turned off.
1145 :     It can be turned on using this call:
1146 :     SMLofNJ.Internals.BTrace.mode (SOME true);
1147 :     Turning it off again:
1148 :     SMLofNJ.Internals.BTrace.mode (SOME false);
1149 :     Querying the current status:
1150 :     SMLofNJ.Internals.BTrace.mode NONE;
1151 :     Annotated programs are about twice as big as normal ones, and they
1152 :     run a factor of 2 to 4 slower with a dummy back-trace plugin (one
1153 :     where all hooks do nothing). The slowdown with a plugin that is
1154 :     actually useful (such as the one supplied by default) is even greater,
1155 :     but in the case of the default plugin it is still only an constant
1156 :     factor (amortized).
1157 :    
1158 :     3. system/Basis/Implementation/NJ/internals.{sig,sml} have been augmented
1159 :     with a sub-structure BTrace for controlling back-tracing. In particular,
1160 :     the above-mentioned function "mode" controls whether the annotation
1161 :     phase is invoked by the compiler. Another important function is
1162 :     "trigger": when called it aborts the current execution and causes
1163 :     the top-level loop to print a full back-trace.
1164 :    
1165 :     4. compiler/MiscUtil/profile/btimp.sml is the current default plugin
1166 :     for back-tracing. It keeps track of the dynamic call stack and in
1167 :     addition to that it keeps a partial history at each "level" of that
1168 :     stack. For example, if a tail-calls b, b tail-calls c, and c tail-calls
1169 :     d and b (at separate times, dynamically), then the report will show:
1170 :    
1171 :     GOTO d
1172 :     /c
1173 :     GOTO \b
1174 :     CALL a
1175 :    
1176 :     This shows that there was an initial non-tail call of a, then a
1177 :     tail-call to b or c, looping behavior in a cluster of functions that
1178 :     consist of b and c, and then a goto from that cluster (i.e., either from
1179 :     b or from c) to d.
1180 :    
1181 :     Note that (depending on the user program) the amount of information
1182 :     that the back-trace module has to keep track of at each level is bounded
1183 :     by a constant. Thus, the whole implementation has the same asymptotical
1184 :     complexity as the original program (both in space and in time).
1185 :    
1186 :     5. compiler/TopLevel/interact/evalloop.sml has been modified to
1187 :     handle the special exception SMLofNJ.Internals.BTrace.BTrace
1188 :     which is raised by the "trigger" function mentioned above.
1189 :    
1190 :     Notes on usage:
1191 :    
1192 :     - Annotated code works well together with unannotated code:
1193 :     Unannotated calls simply do not show up at all in the backtrace.
1194 :    
1195 :     - It is not a good idea to let modules that were annotated during
1196 :     different sessions run at the same time. This is because the compiler
1197 :     chooses small integers to identify individual functions, and there
1198 :     will be clashes if different modules were compiled in separate sessions.
1199 :     (Nothing will crash, and you will even be told about the clashes, but
1200 :     back-trace information will in general not be useful.)
1201 :    
1202 :     - Back-tracing can be confused by callcc and capture.
1203 :    
1204 :     - The only way of getting a back-trace right now is to explicitly
1205 :     invoke the "trigger" function from your user program. Eventually, we
1206 :     should make every exception carry back-trace information (if
1207 :     available). But since this creates more overhead at "raise"-time
1208 :     (similar to the current exnHistory overhead), I have not yet
1209 :     implemented this. (The implementation will be rather easy.) With
1210 :     exceptions carrying back-trace information, this facility will be even
1211 :     more useful because users don't need to modify their programs...
1212 :    
1213 :     - While it is possible to compile the compiler with back-trace
1214 :     annotations turned on (I did it to get some confidence in
1215 :     correctness), you must make absolutely sure that core.sml and
1216 :     btimp.sml are compiled WITHOUT annotation! (core.sml cannot actually
1217 :     be compiled with annotation because there is no core access yet, but
1218 :     if you compile btimp.sml with annotation, then the system will go into
1219 :     an infinite recursion and crash.)
1220 :     Since CM currently does not know about BTrace, the only way to turn
1221 :     annotations on and off for different modules of the compiler is to
1222 :     interrupt CMB.make, change the settings, and re-invoke it. Of course,
1223 :     this is awkward and clumsy.
1224 :    
1225 :     Sample sessions:
1226 :    
1227 :     Standard ML of New Jersey v110.28.1 [FLINT v1.5], June 5, 2000
1228 :     - SMLofNJ.Internals.BTrace.mode (SOME true);
1229 :     [autoloading]
1230 :     [autoloading done]
1231 :     val it = false : bool
1232 :     - structure X = struct
1233 :     - fun main n = let
1234 :     - fun a (x, 0) = d x
1235 :     - | a (x, n) = b (x, n - 1)
1236 :     - and b (x, n) = c (x, n)
1237 :     - and c (x, n) = a (x, n)
1238 :     - and d x = e (x, 3)
1239 :     - and e (x, 0) = f x
1240 :     - | e (x, n) = e (x, n - 1)
1241 :     - and f 0 = SMLofNJ.Internals.BTrace.trigger ()
1242 :     - | f n = n * g (n - 1)
1243 :     - and g n = a (n, 3)
1244 :     - in
1245 :     - f n
1246 :     - end
1247 :     - end;
1248 :     structure X : sig val main : int -> int end
1249 :     - X.main 3;
1250 :     *** BACK-TRACE ***
1251 :     GOTO stdIn:4.2-13.20: X.main[2].f
1252 :     GOTO-( stdIn:4.2-13.20: X.main[2].e
1253 :     GOTO stdIn:4.2-13.20: X.main[2].d
1254 :     / stdIn:4.2-13.20: X.main[2].a
1255 :     | stdIn:4.2-13.20: X.main[2].b
1256 :     GOTO-\ stdIn:4.2-13.20: X.main[2].c
1257 :     CALL stdIn:4.2-13.20: X.main[2].g
1258 :     GOTO stdIn:4.2-13.20: X.main[2].f
1259 :     GOTO-( stdIn:4.2-13.20: X.main[2].e
1260 :     GOTO stdIn:4.2-13.20: X.main[2].d
1261 :     / stdIn:4.2-13.20: X.main[2].a
1262 :     | stdIn:4.2-13.20: X.main[2].b
1263 :     GOTO-\ stdIn:4.2-13.20: X.main[2].c
1264 :     CALL stdIn:4.2-13.20: X.main[2].g
1265 :     GOTO stdIn:4.2-13.20: X.main[2].f
1266 :     GOTO-( stdIn:4.2-13.20: X.main[2].e
1267 :     GOTO stdIn:4.2-13.20: X.main[2].d
1268 :     / stdIn:4.2-13.20: X.main[2].a
1269 :     | stdIn:4.2-13.20: X.main[2].b
1270 :     GOTO-\ stdIn:4.2-13.20: X.main[2].c
1271 :     CALL stdIn:4.2-13.20: X.main[2].g
1272 :     GOTO stdIn:4.2-13.20: X.main[2].f
1273 :     CALL stdIn:2.15-17.4: X.main[2]
1274 :     -
1275 :    
1276 :     (Note that because of a FLINt bug the above code currently does not
1277 :     compile without BTrace turned on.)
1278 :    
1279 :     Here is another example, using my modified Tiger compiler:
1280 :    
1281 :     Standard ML of New Jersey v110.28.1 [FLINT v1.5], June 5, 2000
1282 :     - SMLofNJ.Internals.BTrace.mode (SOME true);
1283 :     [autoloading]
1284 :     [autoloading done]
1285 :     val it = false : bool
1286 :     - CM.make "sources.cm";
1287 :     [autoloading]
1288 :     ...
1289 :     [autoloading done]
1290 :     [scanning sources.cm]
1291 :     [parsing (sources.cm):parse.sml]
1292 :     [creating directory CM/SKEL ...]
1293 :     [parsing (sources.cm):tiger.lex.sml]
1294 :     ...
1295 :     [wrote CM/sparc-unix/semant.sml]
1296 :     [compiling (sources.cm):main.sml]
1297 :     [wrote CM/sparc-unix/main.sml]
1298 :     [New bindings added.]
1299 :     val it = true : bool
1300 :     - Main.compile ("../testcases/merge.tig", "foo.out");
1301 :     *** BACK-TRACE ***
1302 :     CALL lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trvar
1303 :     CALL lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
1304 :     CALL lib/semant.sml:289.3-295.22: SemantFun[2].transExp.trexp.check[2]
1305 :     GOTO lib/semant.sml:289.3-295.22: SemantFun[2].transExp.trexp.check[2]
1306 :     CALL lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
1307 :     CALL lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
1308 :     CALL lib/semant.sml:488.3-505.6: SemantFun[2].transDec.trdec[2].transBody[2]
1309 :     / lib/semant.sml:411.65-543.8: SemantFun[2].transDec
1310 :     CALL-\ lib/semant.sml:413.2-540.9: SemantFun[2].transDec.trdec[2]
1311 :     CALL lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
1312 :     CALL lib/semant.sml:8.52-558.4: SemantFun[2].transProg[2]
1313 :     CALL main.sml:1.18-118.4: Main.compile[2]
1314 :     -
1315 :    
1316 :     ----------------------------------------------------------------------
1317 : blume 673 Name: Matthias Blumen
1318 :     Date: 2000/06/21 18:00:00 JST
1319 :     Tag: blume-20000621-manual
1320 :     Description:
1321 :    
1322 :     CM manual update: Path environments documented.
1323 :    
1324 :     ----------------------------------------------------------------------
1325 : blume 666 Name: Matthias Blume
1326 : blume 672 Date: 2000/06/19 13:40:00
1327 :     Tag: blume-20000619-manual
1328 :     Description:
1329 :    
1330 :     CM manual and system/README update. This only covers the fact that
1331 :     there are no more implicit anchors. (Path environments and the "bind"
1332 :     option to "cm" have yet to be documented.)
1333 :    
1334 :     ----------------------------------------------------------------------
1335 :     Name: Matthias Blume
1336 : blume 671 Date: 2000/06/19 11:05:00 JST
1337 :     Tag: blume-20000619-chdir-bugfix
1338 :     Description:
1339 :    
1340 :     Fixed a bug in new SrcPath module that sometimes led to a bad chDir call.
1341 :    
1342 :     ----------------------------------------------------------------------
1343 :     Name: Matthias Blume
1344 : blume 670 Date: 2000/06/18 22:00:10 JST
1345 :     Tag: blume-20000618-implicit-anchors-really-gone
1346 :     Description:
1347 :    
1348 :     I updates the previous HISTORY entry where I forgot to mention that
1349 :     implicit anchors are no longer with us.
1350 :    
1351 :     The current update also gets rid of the (now useless) controller
1352 :     CM.Control.implicit_anchors.
1353 :    
1354 :     ----------------------------------------------------------------------
1355 :     Name: Matthias Blume
1356 : blume 666 Date: 2000/06/16 17:30:00 JST
1357 :     Tag: blume-20000616-anchorenv
1358 :     Description:
1359 :    
1360 :     This patch implements the long anticipated (just kidding :) "anchor
1361 :     environment" mechanism. In the course of doing this, I also
1362 :     re-implemented CM's internal "SrcPath" module from scratch. The new
1363 :     one should be more robust in certain boundary cases. In any case, it
1364 :     is a lot cleaner than its predecessor (IMHO).
1365 :    
1366 :     This time, although there is yet another boot file format change, I
1367 :     kept the unpickler backward-compatible. As a result, no new bootfiles
1368 :     are necessary and bootstrapping is straightforward. (You cannot read
1369 :     new bootfiles into an old system, but the other way around is no
1370 :     problem.)
1371 :    
1372 :     Visible changes:
1373 :    
1374 : blume 670 ** 0. Implicit path anchors (without the leading $-symbol) are no
1375 :     longer recognized at all. This means that such path names are not
1376 :     illegal either. For example, the name basis.cm simply refers to a
1377 :     local file called "basis.cm" (i.e, the name is an ordinary path
1378 :     relative to .cm-files directory). Or, to put it differently, only
1379 :     names that start with $ are anchored paths.
1380 : blume 666
1381 : blume 670 ** 1. The $<singlearc> abbreviation for $/<singlearc> has finally
1382 :     vanished.
1383 :    
1384 :     John (Reppy) had critizised this as soon as I originally proposed and
1385 : blume 666 implemented it, but at that time I did not really deeply believe
1386 :     him. :) Now I came full-circle because I need the $<singlearc> syntax
1387 :     in another place where it cannot be seen as an abbreviation for
1388 :     $/<singlearc>. To avoid the confusion, $<singlearc> now means what it
1389 :     seems to mean (i.e., it "expands" into the corresponding anchor
1390 :     value).
1391 :    
1392 :     However, when paths are used as members in CM description files, it
1393 :     continues to be true that there must be at least another arc after the
1394 :     anchor. This is now enforced separately during semantic analysis
1395 : blume 670 (i.e., from a lexical/syntactical point of view, the notation is ok.)
1396 : blume 666
1397 :     ** 2. The "cm" class now accepts an option "bind". The option's value
1398 :     is a sub-option list of precisely two items -- one labeled "anchor"
1399 :     and the other one labeled "value". As you might expect, "anchor" is
1400 :     used to specify an anchor name to be bound, and "value" specifies what
1401 :     the anchor is being bound to.
1402 :    
1403 :     The value must be a directory name and can be given in either standard
1404 :     syntax (including the possibility that it is itself an anchored path)
1405 :     or native syntax.
1406 :    
1407 :     Examples:
1408 :    
1409 :     foo.cm (bind:(anchor:bar value:$mystuff/bar))
1410 :     lib.cm (bind:(anchor:a value:"H:\\x\\y\\z")) (* only works under windows *)
1411 :    
1412 :     and so on.
1413 :    
1414 :     The meaning of this is that the .cm-file will be processed with an
1415 :     augmented anchor environment where the given anchor(s) is/are bound to
1416 :     the given values(s).
1417 :    
1418 :     The rationale for having this feature is this: Suppose you are trying
1419 :     to use two different (already stable) libraries a.cm and b.cm (that
1420 :     you perhaps didn't write yourself). Further, suppose each of these
1421 :     two libraries internally uses its own auxiliary library $aux/lib.cm.
1422 :     Normally you would now have a problem because the anchor "lib" can not
1423 :     be bound to more than one value globally. Therefore, the project that
1424 :     uses both a.cm and b.cm must locally redirect the anchor to some other
1425 :     place:
1426 :    
1427 :     a.cm (bind:(anchor:lib value:/usr/lib/smlnj/a-stuff))
1428 :     b.cm (bind:(anchor:lib value:/usr/lib/smlnj/b-stuff))
1429 :    
1430 :     This hard-wires $lib/aux.cm to /usr/lib/smlnj/a-stuff/aux.cm or
1431 :     /usr/lib/smlnj/b-stuff/aux.cm, respectively.
1432 :    
1433 :     Hard-wiring path names is a bit inflexible (and CM will verbosely warn
1434 :     you when you do so at the time of CM.stabilize). Therefore, you can
1435 :     also use an anchored path as the value:
1436 :    
1437 :     a.cm (bind:(anchor:lib value:$a-lib))
1438 :     b.cm (bind:(anchor:lib value:$b-lib))
1439 :    
1440 :     Now you can globally configure (using the usual CM.Anchor.anchor or
1441 :     pathconfig machinery) bindings for "a-lib" and "b-lib". Since "lib"
1442 :     itself is always locally bound, setting it globally is no longer
1443 :     meaningful or necessary (but it does not hurt either). In fact, "lib"
1444 :     can still be used as a global anchor for separate purposes. As a
1445 :     matter of fact, one can locally define "lib" in terms of a global
1446 :     "lib":
1447 :    
1448 :     a.cm (bind:(anchor:lib value:$lib/a))
1449 :     b.cm (bind:(anchor:lib value:$lib/b))
1450 :    
1451 :     ** 3: The encoding of path names has changed. This affects the way
1452 :     path names are shown in CM's progress report and also the internal
1453 :     protocol encoding used for parallel make.
1454 :    
1455 :     The encoding now uses one or more ':'-separated segments. Each
1456 :     segments corresponds to a file that has been specified relative to the
1457 :     file given by its preceding segment. The first segment is either
1458 :     relative to the CWD, absolute, or anchored. Each segment itself is
1459 :     basically a Unix pathname; all segments but the first are relative.
1460 :    
1461 :     Example:
1462 :    
1463 :     $foo/bar/baz.cm:a/b/c.sml
1464 :    
1465 :     This path denotes the file bar/a/b/c.sml relative to the directory
1466 :     denoted by anchor "foo". Notice that the encoding also includes
1467 :     baz.cm which is the .cm-file that listed a/b/c.sml. As usual, such
1468 :     paths are resolved relative to the .cm-files directory, so baz.cm must
1469 :     be ignored to get the "real" pathname.
1470 :    
1471 :     To make this fact more obvious, CM puts the names of such "virtual
1472 :     arcs" into parentheses when they appear in progress reports. (No
1473 :     parentheses will appear in the internal protocol encoding.) Thus,
1474 :     what you really see is:
1475 :    
1476 :     $foo/bar/(baz.cm):a/b/c.sml
1477 :    
1478 :     I find this notation to be much more informative than before.
1479 :    
1480 :     Another new feature of the encoding is that special characters
1481 :     including parentheses, colons, (back)slashes, and white space are
1482 :     written as \ddd (where ddd is the decimal encoding of the character).
1483 :    
1484 : blume 670 *** The CM manual still needs to be updated.
1485 :    
1486 : blume 666 ----------------------------------------------------------------------
1487 : leunga 660 Name: Allen Leung
1488 :     Date: 2000/06/15 00:38:00
1489 :     Tag: leunga-20000615-x86-peephole
1490 :    
1491 :     x86 Peephole fix by Fermin. Affects c-- and moby only.
1492 :    
1493 :     ----------------------------------------------------------------------
1494 : blume 658 Name: Matthias Blume
1495 :     Date: 2000/06/12 11:40:00
1496 :     Tag: blume-20000612-parmakefix
1497 :     Description:
1498 :    
1499 :     More cleanup after changing the file naming scheme: This time I
1500 :     repaired the parallel make mechanism for CMB.make which I broke earlier.
1501 :    
1502 :     ----------------------------------------------------------------------
1503 : leunga 657 Name: Allen Leung
1504 :     Date: 2000/06/09 01:25:00
1505 :     Tag: leunga-20000609-various
1506 :    
1507 :     None of these things should affect normal SML/NJ operations
1508 :    
1509 :     1. Peephole improvements provided by Fermin (c--)
1510 :     2. New annotation DEFUSE for adding extra dependence (moby)
1511 :     3. New X86 LOCK instructions (moby)
1512 :     4. New machine description language for reservation tables (scheduling)
1513 :     5. Fixes to various optimization/analysis modules (branch chaining, dominator
1514 :     trees etc.)
1515 :     6. I've changed the CM files so that they can work with versions
1516 :     110.0.6, 110.25 and 110.28
1517 :    
1518 :     ----------------------------------------------------------------------
1519 : blume 652 Name: Matthias Blume
1520 : blume 656 Date: 2000/06/09 12:40:00
1521 :     Tag: blume-20000609-log
1522 :     Description:
1523 :    
1524 :     - Removed all(?) remaining RCS Log entries from sources.
1525 :    
1526 :     - Fixed bug in ml-yacc and ml-lex sources (use explicit anchors for
1527 :     anchored paths).
1528 :    
1529 :     ----------------------------------------------------------------------
1530 :     Name: Matthias Blume
1531 : blume 653 Date: 2000/06/07 17:00:00 JST
1532 :     Tag: blume-20000607-no-implicit-anchors
1533 :     Description:
1534 :    
1535 :     1. This update changes the default setting for
1536 :     CM.Control.implicit_anchors from true to false. This means that
1537 :     implicit anchors are no longer permitted by default. I also tried to
1538 :     make sure that nothing else still relies on implicit anchors.
1539 :     (This is the next step on the schedule towards a CM that does not even
1540 :     have the notion of implicit anchors anymore.)
1541 :    
1542 :     2. More CM manual updates.
1543 :    
1544 :     3. I managed to track down and fix the pickling bug I mentioned last
1545 :     time. Because of the previously existing workaround, this entails no
1546 :     immediate practical changes.
1547 :    
1548 :     ----------------------------------------------------------------------
1549 :     Name: Matthias Blume
1550 : blume 652 Date: 2000/06/06 11:15:00 JST
1551 :     Tag: blume-20000606-lazierpickle
1552 :     Description:
1553 :    
1554 :     !!!! NEW BOOT FILES !!!!
1555 :    
1556 :     * The main purpose of this update is to make library pickles lazier in
1557 :     order to reduce the initial space penalty for autoloading a library.
1558 :     As a result, it is now possible to have $smlnj/compiler.cm
1559 :     pre-registered. This should take care of the many complaints or
1560 :     inquiries about missing structure Compiler. This required changes to
1561 :     CM's internal data structures and small tweaks to some algorithms.
1562 :    
1563 :     As a neat additional effect, it is no longer necessary (for the sake
1564 :     of lean heap image files) to distinguish between a "minimal" CM and a
1565 :     "full" CM. Now, there is only one CM (i.e., the "full" version:
1566 :     $smlnj/cm.cm aka $smlnj/cm/full.cm), and it is always available at the
1567 :     interactive top level. ($smlnj/cm/minimal.cm is gone.)
1568 :    
1569 :     To make the life of compiler-hackers easier, "makeml" now also
1570 :     pre-registers $smlnj/cmb.cm (aka $smlnj/cmb/current.cm). In other
1571 :     words, after you bootstrap a new sml for the first time, you will not
1572 :     have to autoload $smlnj/cmb.cm again afterwards. (The first time
1573 :     around you will still have to do it, though.)
1574 :    
1575 :     * A second change consists of major updates to the CM manual. There
1576 :     are now several appendices with summary information and also a full
1577 :     specification of the CM description file syntax.
1578 :    
1579 :     * In directory src/system I added the script "allcross". This script
1580 :     invokes sml and cross-compiles the compiler for all supported
1581 :     architectures. (Useful when providing a new set of boot files.)
1582 :    
1583 :     * There seems to be a latent bug in my "lazy pickles" mechanism. I
1584 :     added a small tweak to pickle-util.sml to work around this problem,
1585 :     but it is not a proper fix yet. I will investigate further. (The
1586 :     effect of the bug was an inflation of library pickle size.)
1587 :    
1588 :     * Version number increased to 110.28.1 (to avoid compatibility problems).
1589 :    
1590 :     ----------------------------------------------------------------------
1591 : leunga 646 Name: Allen Leung
1592 : leunga 648 Date: 2000/05/25 17:28 EDT
1593 :     Tag: leunga-20000525-ra
1594 :     Description:
1595 :    
1596 :     Fixed a bug in freezing phase of the register allocator.
1597 :    
1598 :     ----------------------------------------------------------------------
1599 :     Name: Allen Leung
1600 : leunga 647 Date: 2000/05/15 22:53 EDT
1601 : leunga 646 Tag: leunga-20000515-alpha-x86-ra
1602 :     Description:
1603 :    
1604 :     1. Alpha
1605 :    
1606 :     Slight cleanup. Removed the instruction SGNXL
1607 :    
1608 :     2. X86
1609 :    
1610 :     Added the following instructions to the instruction set:
1611 :    
1612 :     ROLx, RORx,
1613 :     BTx, BTSx, BTLx, BTRx,
1614 :     XCHGx, and variants with the LOCK prefix
1615 :    
1616 :     3. Register Allocation
1617 :    
1618 :     The module ra-rewrite-with-renaming has been improved.
1619 :    
1620 : leunga 647 These have no effect on SML/NJ.
1621 :    
1622 : leunga 646 ----------------------------------------------------------------------
1623 : blume 642 Name: Matthias Blume
1624 : blume 645 Date: 2000/05/15 16:20:00 JST
1625 :     Tag: blume-20000515-lightrebuild
1626 :     Description:
1627 :    
1628 :     1. I added an alternative to "-rebuild" to "makeml". The difference is
1629 :     that prior to calling CMB.make' the CM-variable "LIGHT" will be
1630 :     defined. In effect, the command will not build any cross-compiler
1631 :     backends and therefore finish more quickly.
1632 :    
1633 :     The "fixpt" script also takes a "-light" switch to be able to use
1634 :     this new facility while compiling for a fixpoint.
1635 :    
1636 :     2. I replaced all mentions of anchored paths in group owner specifications
1637 :     with simple relative paths (usually starting with "..").
1638 :     The rationale is that a library's internal workings should not be
1639 :     compromised by the lack of some anchor. (An anchor is necessary
1640 :     for someone who wants to refer to the library by an anchored path,
1641 :     but it should not be necessary to build the same library in the first
1642 :     place.)
1643 :    
1644 :     3. I changed the way CM's tool mechanism determines the shell command
1645 :     string used for things like ml-yacc etc. so that it does not break
1646 :     when CM.Control.implicit_anchors is turned off.
1647 :    
1648 :     ----------------------------------------------------------------------
1649 :     Name: Matthias Blume
1650 : blume 644 Date: 2000/05/12 18:20:00 JST
1651 :     Tag: blume-20000512-ml-build
1652 :     Description:
1653 :    
1654 :     Fixed a bug in config/_ml-build that prevented ml-yacc and ml-lex from
1655 :     getting installed properly (by config/install.sh).
1656 :    
1657 :     ----------------------------------------------------------------------
1658 :     Name: Matthias Blume
1659 : blume 643 Date: 2000/05/12 17:30:00 JST
1660 :     Tag: blume-20000512-anchors
1661 :     Description:
1662 :    
1663 :     !!! NEW BOOT FILES !!!
1664 :    
1665 :     This change is in preparation of fading out support for "implicitly
1666 :     anchored path names". I went through all sources and used the
1667 :     explicit (and relatively new) $-notation. See system/README and the
1668 :     CM manual for more info on this.
1669 :    
1670 :     I also modified the anchoring scheme for some things such as "smlnj",
1671 :     "MLRISC", "cm", etc. to take advantage of the fact that explicit
1672 :     anchors are more expressive: anchor name and first arc do not have to
1673 :     coincide. This entails the following user-visible change:
1674 :    
1675 :     You have to write $smlnj/foo/bar instead of smlnj/foo/bar. In
1676 :     particular, when you fire up sml with a command-line argument, say,
1677 :     e.g.:
1678 :    
1679 :     sml '$smlnj/cmb.cm'
1680 :    
1681 :     At the ML toplevel prompt:
1682 :    
1683 :     CM.autoload "$smlnj/cmb.cm";
1684 :    
1685 :     There is also a new controller in CM.Control that can be used to turn
1686 :     off all remaining support for implicit anchors by saying:
1687 :    
1688 :     CM.autoload "$smlnj/
1689 :     #set CM.Control.implicit_anchors false;
1690 :    
1691 :     This causes CM to reject implicitly anchored paths. This is (for the
1692 :     time being) less permissive than the "final" version where there will
1693 :     be no more such implicit anchors and relative paths will be just that:
1694 :     relative.
1695 :    
1696 :     The next step (version after next version?) will be to make the
1697 :     default for CM.Control.implicit_anchors false. After the dust has
1698 :     settled, I can then produce the "final" version of this...
1699 :    
1700 :     Note: Since bootstrapping is a bit tricky, I provided new boot files.
1701 :    
1702 :     ----------------------------------------------------------------------
1703 :     Name: Matthias Blume
1704 : blume 642 Date: 2000/05/11 16:30:00 JST
1705 :     Tag: blume-20000511-sources
1706 :     Description:
1707 :    
1708 :     The main change is that I added function CM.sources as a generalized
1709 :     version of the earlier CM.makedepend. This entails the following
1710 :     additional changes:
1711 :    
1712 :     - CM.makedepend has been dropped.
1713 :    
1714 :     - CM manual has been updated.
1715 :    
1716 :     - TOOLS signature and API have been changed.
1717 :    
1718 :     ----------------------------------------------------------------------
1719 : leunga 640 Name: Allen Leung
1720 : leunga 641 Date: 2000/05/10 21:17 EDT
1721 :     Tag: leunga-20000510-moby-c--ssa
1722 :     Description:
1723 :    
1724 :     Various bug fixes and new features for C--, Moby and MLRISC optimizations.
1725 :     None of these affect SML/NJ.
1726 :    
1727 :     1. Register Allocation
1728 :    
1729 :     a. A new ra spilling module (ra/ra-spill-with-renaming) is implemented.
1730 :     This module tries to remove local (i.e. basic block level) redundancies
1731 :     during spilling.
1732 :    
1733 :     b. A new framework for performing region based register allocation.
1734 :     Not yet entirely functional.
1735 :    
1736 :     2. X86
1737 :    
1738 :     a. DefUse for POP was missing the stack pointer [found by Lal]
1739 :     b. Reload for CALL was incorrect in X86Spill [found by John]
1740 :     c. Various fixes in X86Spill so that it can be used correctly for
1741 :     the new spilling module.
1742 :    
1743 :     3. SSA/IR
1744 :    
1745 :     a. New module ir/dj-dataflow.sml implements elimination based
1746 :     data flow analysis.
1747 :    
1748 :     4. MLRiscGen
1749 :    
1750 :     a. Fix for gc type annotation
1751 :    
1752 :     5. MDGen
1753 :    
1754 :     Various fixes for machine description -> ml code translation. For ssa
1755 :     only.
1756 :    
1757 :     ----------------------------------------------------------------------
1758 :     Name: Allen Leung
1759 : leunga 640 Date: 2000/05/08 22:17 EDT
1760 :     Tag: leunga-20000508-labexp
1761 :     Description:
1762 :    
1763 :     Fermin has found a few assembly problems with constant expressions
1764 :     generated in LabelExp. Mostly, the problems involve extra parentheses,
1765 :     which choke on dumb assemblers. This is his fix.
1766 :    
1767 :     ----------------------------------------------------------------------
1768 : dbm 635 Name: Dave MacQueen
1769 :     Date: 2000/04/09 14:00 EDT
1770 :     Tag: dbm-20000502-Version_110_28
1771 :     Description:
1772 :    
1773 :     1. Updated src/compiler/TopLevel/main/version.sml to version 110.28
1774 :    
1775 :     2. Updated config/version to 110.28
1776 :    
1777 :     3. Updated config/srcarchiveurl
1778 :    
1779 :     3. New boot files!
1780 :     ftp://ftp.research.bell-labs.com/dist/smlnj/working/110.28/
1781 :    
1782 :     ----------------------------------------------------------------------
1783 : blume 634 Name: Matthias Blume
1784 :     Date: 2000/05/01 19:05:00 JST
1785 :     Tag: blume-20000501-noweb
1786 :     Description:
1787 :    
1788 :     A new noweb tool has been added. The existing system is entirely
1789 :     unaffected by this, but some CM users have asked for renewed noweb
1790 :     support. Everything is documented in the CM manual.
1791 :    
1792 :     New (plugin) libraries:
1793 :    
1794 :     noweb-tool.cm
1795 :     nw-ext.cm
1796 :    
1797 :     ----------------------------------------------------------------------
1798 : dbm 633 Name: Dave MacQueen
1799 :     Date: 2000/04/30 12:40PM EDT
1800 :     Tag: dbm-20000430-bug_fixes
1801 :     Description:
1802 :    
1803 :     1. Fix for bug 1498
1804 :     smlnj/src/system/Basis/Implementation/Unsafe/object.sig
1805 :     smlnj/src/system/Basis/Implementation/Unsafe/object.sml
1806 :     added toRealArray function
1807 :     smlnj/src/compiler/MiscUtil/print/ppobj.sml
1808 :     added check for tag Obj.RealArray to array printing case in ppObj
1809 :    
1810 :     2. Fix for bug 1510
1811 :     smlnj/src/compiler/Semant/types/typesutil.sml
1812 :     fixed definition of dummyargs (used by equalTycon) so that
1813 :     dummy args are distinct types
1814 :    
1815 :     ----------------------------------------------------------------------
1816 : blume 629 Name: Matthias Blume
1817 : blume 632 Date: 2000/04/30 01:00:00 JST
1818 :     Tag: blume-20000430-versions
1819 :     Description:
1820 :    
1821 :     1. CM version numbering added. This is an implementation of Lal's
1822 :     proposal for adding version numbers and version checking to .cm
1823 :     files. Lal said that his proposal was just that -- a proposal.
1824 :     For the time being I went ahead and implemented it so that people
1825 :     can comment on it. Everything is completely backward-compatible
1826 :     (except for the stable library format, i.e., new bootfiles!).
1827 :    
1828 :     As usual, see the CM manual for details.
1829 :    
1830 :     2. An alternative syntax for anchored paths has been implemented.
1831 :     Dave has recently voiced the same concerns that I had when I did
1832 :     this, so there should be some support. My take is that eventually
1833 :     I will let support for the current syntax (where anchors are
1834 :     "implicit") fade out in favor of the new, explicit syntax.
1835 :     In order to be backward-compatible, both old and new syntax are
1836 :     currently supported.
1837 :    
1838 :     Again, see the CM manual for details.
1839 :    
1840 :     3. Parallel make is trying to be slightly smarter: When the master
1841 :     process finds a "bottleneck", i.e., when there is only one
1842 :     compilation unit that can be compiled and everybody else is
1843 :     waiting on it, then it will simply compile it directly instead
1844 :     of clumsily telling one of the slaves to do it.
1845 :    
1846 :     4. Support for "unsharing" added. This is necessary in order to be
1847 :     able to have two different versions of the same library running
1848 :     at the same time (e.g., for trying out a new MLRISC while still
1849 :     having the old MLRISC linked into the current compiler, etc.)
1850 :     See the CM manual.
1851 :    
1852 :     5. Simple "makedepend" functionality added for generating Makefile
1853 :     dependency information. (This is rather crude at the moment.
1854 :     Expect some changes here in the future.)
1855 :    
1856 :     6. ".fun" added as a recognized suffix for ML files. Also documented
1857 :     explicitly in the manual that the fallback behavior (unknown suffix
1858 :     -> ML file) is not an official feature!
1859 :    
1860 :     7. Small changes to the pickler for stable libraries.
1861 :    
1862 :     8. Several internal changes to CM (for cleanup/improvement).
1863 :    
1864 :    
1865 :     !!!! NEW BINFILES !!!!
1866 :    
1867 :     ----------------------------------------------------------------------
1868 :     Name: Matthias Blume
1869 : blume 631 Date: 2000/04/28 17:30:00 JST
1870 :     Tag: blume-20000428-pathconfig
1871 :     Description:
1872 :    
1873 :     1. I changed config/install.sh to remove duplicate entries from the
1874 :     lib/pathconfig file at the end. Moreover, the final version of
1875 :     lib/pathconfig is sorted alphabetically. The same (sorting) is done
1876 :     in src/system/installml.
1877 :    
1878 :     2. The config/install.sh script now consistently uses relative
1879 :     pathnames in lib/pathconfig whenever the anchor is in the lib
1880 :     directory. (So far this was true for the libraries that come
1881 :     pre-compiled and bundled as part of the bootfiles but not for
1882 :     libraries that are compiled by the script itself.)
1883 :    
1884 :     ----------------------------------------------------------------------
1885 :     Name: Matthias Blume
1886 : blume 629 Date: 2000/04/26 13:10:00 JST
1887 :     Tag: blume-20000426-fun_suffix
1888 :     Description:
1889 :    
1890 :     Added ".fun" as a recognized file name suffix (for ML code).
1891 :    
1892 :     ----------------------------------------------------------------------
1893 : leunga 628 Name: Allen Leung
1894 :     Date: 2000/04/25 17:00:00 EST
1895 :     Tag: leunga-20000425-alpha-ra
1896 :     Description:
1897 :    
1898 :     1. Alpha
1899 :    
1900 :     PSEUDOARITH was missing in AlphaRewrite. This causes an endless loop
1901 :     in C--.
1902 :    
1903 :     2. RA
1904 :    
1905 :     Added a flag "ra-dump-size" to print out the size of the flowgraph
1906 :     and the interference graph.
1907 :    
1908 :     ----------------------------------------------------------------------
1909 : dbm 627 Name: Dave MacQueen
1910 :     Date: 2000/04/25/
1911 :     Tag: dbm-20000425-mlyacc_doc_examples
1912 :     Description:
1913 :     Updated mlyacc.tex sections 5 and 7 for SML '97 and CM.
1914 :     Updated all three examples in src/ml-yacc/examples to run
1915 :     under 110.* using CM.make.
1916 :    
1917 :     ----------------------------------------------------------------------
1918 : leunga 624 Name: Allen Leung
1919 :     Date: 2000/04/20 23:04:00 EST
1920 :     Tag: leunga-20000420-ssa-c---stuff
1921 :     Description:
1922 :    
1923 :     This update synchronizes my repository with Yale's. Most of these
1924 :     changes, however, do not affect SML/NJ at all (the RA is an exception).
1925 :    
1926 :     1. Register Allocator
1927 :    
1928 :     a. An improvement in the interference graph construction:
1929 :     Given a copy
1930 :    
1931 :     s <- t
1932 :    
1933 : leunga 628 no interference edge between s and t is added for this definition of s.
1934 : leunga 624
1935 :     b. I've added two new spill heuristic modules that Fermin and I developed
1936 :     (in the new library RA.cm). These are unused in SML/NJ but maybe
1937 :     useful for others (Moby?)
1938 :    
1939 :     2. X86
1940 :    
1941 :     a. Various fixes in the backend provided by Fermin [C--] and Lal.
1942 :    
1943 :     3. Alpha
1944 :    
1945 :     a. Added the BSR instruction and code generation that goes with it [C--]
1946 :     b. Other fixes too numerous to recount provided by Fermin [C--]
1947 :    
1948 :     4. Regmaps
1949 :    
1950 :     a. The regmaps are not initialized with the identity physical bindings
1951 :     at creation time. This is unneeded.
1952 :    
1953 :     5. MLRISC Optimizations
1954 :    
1955 :     a. The DJ-Graph module can now compute the iterated dominance frontiers
1956 :     intersects with liveness incrementally in linear time! Woohoo!
1957 :     This is now used in my new SSA construction algorithm.
1958 :    
1959 :     b. THe branch reorganization module is now smarter about linear chains of
1960 :     basic blocks.
1961 :    
1962 :    
1963 :     ----------------------------------------------------------------------
1964 : blume 615 Name: Matthias Blume
1965 :     Date: 2000/04/12 13:52:00 JST
1966 :     Tag: blume_main_v110p27_1
1967 :     Description:
1968 :    
1969 :     Changed install.sh script to handle archive files without version number
1970 :     and to use "boot.<arch>-<os>" instead of "sml.boot.<arch>-<os>" for the
1971 :     name of the boot file archive.
1972 :    
1973 :     ----------------------------------------------------------------------
1974 : dbm 607 Name: Dave MacQueen
1975 :     Date: 2000/04/09 14:00 EDT
1976 :     Tag: dbm-20000410-Version_110_27
1977 :     Description:
1978 :    
1979 :     1. Updated src/compiler/TopLevel/main/version.sml to version 110.27
1980 :    
1981 :     2. Updated src/config/version to 110.27
1982 :    
1983 :     3. New boot files!
1984 :    
1985 :     ----------------------------------------------------------------------
1986 : leunga 606 Name: Allen Leung
1987 :     Date: 2000/04/09 19:09:00 EST
1988 :     Tag: leunga-20000409-misc
1989 :     Description:
1990 :    
1991 :     1. Yet another fix for x86 assembly for idivl, imull, mull and friends.
1992 :    
1993 :     2. Miscellaneous improvements to MLRISC (unused in sml/nj)
1994 :    
1995 :     ----------------------------------------------------------------------
1996 : monnier 605 Name: Stefan
1997 :     Date: 2000/04/07 10:00:00 EDT
1998 :     Tag: monnier-20000406-branch-handling
1999 :     Description:
2000 :    
2001 :     Improved handling of branches (mostly those generated from
2002 :     polymorphic equality), removed switchoff and changed the
2003 :     default optimization settings (more cpsopt and less flintopt).
2004 :    
2005 :     ----------------------------------------------------------------------
2006 : leunga 601 Name: Allen Leung
2007 : leunga 602 Date: 2000/04/06 01:30:00 EST
2008 :     Tag: leunga-20000406-peephole-x86-SSA-2
2009 :     Description:
2010 :    
2011 :     Forgot a few files.
2012 :    
2013 :     ----------------------------------------------------------------------
2014 :     Name: Allen Leung
2015 : leunga 601 Date: 2000/04/06 00:36:00 EST
2016 :     Tag: leunga-20000406-peephole-x86-SSA
2017 :     Description:
2018 :    
2019 :     1. New Peephole code
2020 :    
2021 :     2. Minor improvement to X86 instruction selection
2022 :    
2023 :     3. Various fixes to SSA and machine description -> code translator
2024 :    
2025 :     ----------------------------------------------------------------------
2026 : blume 595 Name: Matthias Blume
2027 :     Date: 2000/04/05 12:30:00 JST
2028 :     Tag: blume_main_v110p26p2_3
2029 :     Description:
2030 :    
2031 :     This update just merges three minor cosmetic updates to CM's sources
2032 :     to get ready for the 110.27 code freeze on Friday. No functionality
2033 :     has changed.
2034 :    
2035 :     ----------------------------------------------------------------------
2036 : leunga 593 Name: Allen Leung
2037 : leunga 594 Date: 2000/04/04 19:39:00 EST
2038 :     Tag: leunga-20000404-x86-asm
2039 :     Description:
2040 :    
2041 :     1. Fixed a problem in X86 assembly.
2042 :    
2043 :     Things like
2044 :    
2045 :     jmp %eax
2046 :     jmp (%eax)
2047 :    
2048 :     should be output as
2049 :    
2050 :     jmp *%eax
2051 :     jmp *(%eax)
2052 :    
2053 :     2. Assembly output
2054 :    
2055 :     Added a new flag
2056 :    
2057 :     "asm-indent-copies" (default to false)
2058 :    
2059 :     When this flag is on, parallel copies will be indented an extra level.
2060 :    
2061 :     ----------------------------------------------------------------------
2062 :     Name: Allen Leung
2063 : leunga 593 Date: 2000/04/04 03:18:00 EST
2064 :     Tag: leunga-20000404-C--Moby
2065 :     Description:
2066 :    
2067 :     All of these fixes are related to C--, Moby, and my own optimization
2068 :     stuff; so they shouldn't affect SML/NJ.
2069 :    
2070 :     1. X86
2071 :    
2072 :     Various fixes related floating point, and extensions.
2073 :    
2074 :     2. Alpha
2075 :    
2076 :     Some extra patterns related to loads with signed/zero extension
2077 :     provided by Fermin.
2078 :    
2079 :     3. Assembly
2080 :    
2081 : monnier 659 When generating assembly, resolve the value of client defined constants,
2082 : leunga 593 instead of generating symbolic values. This is controlled by the
2083 :     new flag "asm-resolve-constants", which is default to true.
2084 :    
2085 :     4. Machine Descriptions
2086 :    
2087 :     a. The precedence parser was slightly broken when parsing infixr symbols.
2088 :     b. The type generalizing code had the bound variables reversed, resulting
2089 :     in a problem during arity raising.
2090 :     c. Various fixes in machine descriptions.
2091 :    
2092 :     ----------------------------------------------------------------------
2093 : blume 592 Name: Matthias Blume
2094 :     Date: 2000/04/03 16:05:00 JST
2095 :     Tag: blume_main_v110p26p2_2
2096 :     Description:
2097 :    
2098 :     I eliminated coreEnv from compInfo. Access to the "Core" structure is
2099 :     now done via the ordinary static environment that is context to each
2100 :     compilation unit.
2101 :    
2102 :     To this end, I arranged that instead of "structure Core" as "structure
2103 :     _Core" is bound in the pervasive environment. Core access is done via
2104 : monnier 659 _Core (which can never be accidentally rebound because _Core is not a
2105 : blume 592 legal surface-syntax symbol).
2106 :    
2107 :     The current solution is much cleaner because the core environment is
2108 :     now simply part of the pervasive environment which is part of every
2109 :     compilation unit's context anyway. In particular, this eliminates all
2110 :     special-case handling that was necessary until now in order to deal
2111 :     with dynamic and symbolic parts of the core environment.
2112 :    
2113 :     Remaining hackery (to bind the "magic" symbol _Core) is localized in the
2114 : monnier 659 compilation manager's bootstrap compiler (actually: in the "init group"
2115 : blume 592 handling). See the comments in src/system/smlnj/init/init.cmi for
2116 :     more details.
2117 :    
2118 :     I also tried to track down all mentions of "Core" (as string argument
2119 :     to Symbol.strSymbol) in the compiler and replaced them with a
2120 :     reference to the new CoreSym.coreSym. Seems cleaner since the actual
2121 :     name appears in one place only.
2122 :    
2123 :     Binfile and bootfile format have not changed, but the switchover from
2124 :     the old "init.cmi" to the new one is a bit tricky, so I supplied new
2125 :     bootfiles anyway.
2126 :    
2127 :     ----------------------------------------------------------------------
2128 : leunga 591 Name: Allen Leung
2129 :     Date: 2000/04/02 21:17:00 EST
2130 :     Tag: leunga-20000402-mltree
2131 :     Description:
2132 : leunga 585
2133 : leunga 591 1. Renamed the constructor CALL in MLTREE by popular demand.
2134 :     2. Added a bunch of files from my repository. These are currently
2135 :     used by other non-SMLNJ backends.
2136 :    
2137 : leunga 576 ----------------------------------------------------------------------
2138 : leunga 590 Name: Allen Leung
2139 :     Date: 2000/03/31 21:15:00 EST
2140 :     Tag: leunga-20000331-aliasing
2141 :     Description:
2142 :    
2143 :     This update contains a rewritten (and hopefully more correct) module
2144 :     for extracting aliasing information from CPS.
2145 :    
2146 :     To turn on this feature:
2147 :    
2148 :     Compiler.Control.CG.memDisambiguate := true
2149 :    
2150 :     To pretty print the region information with assembly
2151 :    
2152 :     Compiler.Control.MLRISC.getFlag "asm-show-region" := true;
2153 :    
2154 :     To control how many levels of aliasing information are printed, use:
2155 :    
2156 :     Compiler.Control.MLRISC.getInt "points-to-show-level" := n
2157 :    
2158 :     The default of n is 3.
2159 :    
2160 :     ----------------------------------------------------------------------
2161 : dbm 589 Name: David MacQueen
2162 :     Date: 2000/03/31 11:15:00 EST
2163 :     Tag: dbm-20000331-runtime_fix
2164 :     Description:
2165 :    
2166 :     This update contains:
2167 :    
2168 :     1. runtime/c-lib/c-libraries.c
2169 :     includes added in revision 1.2 caused compilation errors on hppa-hpux
2170 :    
2171 :     2. fix for bug 1556
2172 :     system/Basis/Implementation/NJ/internal-signals.sml
2173 :    
2174 :     ----------------------------------------------------------------------
2175 : blume 587 Name: Matthias Blume
2176 : blume 588 Date: 2000/03/31 18:00:00 JST
2177 :     Tag: blume_main_v110p26p2_1
2178 :     Description:
2179 :    
2180 :     This update contains:
2181 :    
2182 :     1. A small change to CM's handling of stable libraries:
2183 :     CM now maintains one "global" modmap that is used for all stable
2184 :     libraries. The use of such a global modmap maximizes sharing and
2185 :     minimizes the need for re-traversing parts of environments during
2186 :     modmap construction. (However, this has minor impact since modmap
2187 :     construction seems to account for just one percent or less of total
2188 :     compile time.)
2189 :    
2190 :     2. I added a "genmap" phase to the statistics. This is where I got the
2191 :     "one percent" number (see above).
2192 :    
2193 :     3. CM's new tool parameter mechanism just became _even_ better. :)
2194 :     - The parser understands named parameters and recursive options.
2195 :     - The "make" and "shell" tools use these new features.
2196 :     (This makes it a lot easier to cascade these tools.)
2197 :     - There is a small syntax change: named parameters use a
2198 :    
2199 :     <name> : ( <option> ... ) or
2200 :     <name> : <string>
2201 :    
2202 :     syntax. Previously, named parameters were implemented in an
2203 :     ad-hoc fashion by each tool individually (by parsing strings)
2204 :     and had the form
2205 :    
2206 :     <name>=<string>
2207 :    
2208 :     See the CM manual for a full description of these issues.
2209 :    
2210 :     ----------------------------------------------------------------------
2211 :     Name: Matthias Blume
2212 : blume 587 Date: 2000/03/30 18:00:00 JST
2213 :     Tag: blume_main_v110p26p2_0
2214 :     Description:
2215 :    
2216 :     !!!!! WARNING !!!!!!
2217 :     !! New binfiles !!
2218 :     !!!!!!!!!!!!!!!!!!!!
2219 :    
2220 :     This update contains:
2221 :    
2222 :     1. Moderate changes to CM:
2223 :    
2224 :     - Changes to CM's tools mechanism. In particular, it is now possible
2225 :     to have tools that accept additional "command line" parameters
2226 :     (specified in the .cm file at each instance where the tool's class is
2227 :     used).
2228 :    
2229 : monnier 659 This was done to accommodate the new "make" and "shell" tools which
2230 :     facilitate fairly seamless hookup to portions of code managed using
2231 : blume 587 Makefiles or Shell scripts.
2232 :    
2233 :     There are no classes "shared" or "private" anymore. Instead, the
2234 :     sharing annotation is now a parameter to the "sml" class.
2235 :    
2236 :     There is a bit of generic machinery for implementing one's own
2237 :     tools that accept command-line parameters. However, I am not yet fully
2238 :     satisfied with that part, so expect changes here in the future.
2239 :    
2240 :     All existing tools are described in the CM manual.
2241 :    
2242 : monnier 659 - Slightly better error handling. (CM now suppresses many followup
2243 : blume 587 error messages that tended to be more annoying than helpful.)
2244 :    
2245 :     2. Major changes to the compiler's static environment data structures.
2246 :    
2247 :     - no CMStaticEnv anymore.
2248 :     - no CMEnv, no "BareEnvironment" (actually, _only_ BareEnvironment,
2249 :     but it is called Environment), no conversions between different
2250 :     kinds of static environments
2251 :    
2252 :     - There is still a notion of a "modmap", but such modmaps are generated
2253 :     on demand at the time when they are needed. This sounds slow, but I
2254 :     sped up the code that generates modmaps enough for this not to lead to
2255 :     a slowdown of the compiler (at least I didn't detect any).
2256 :    
2257 :     - To facilitate rapid modmap generation, static environments now
2258 :     contain an (optional) "modtree" structure. Modtree annotations are
2259 :     constructed by the unpickler during unpickling. (This means that
2260 :     the elaborator does not have to worry about modtrees at all.)
2261 :     Modtrees have the advantage that they are compositional in the same
2262 :     way as the environment data structure itself is compositional.
2263 :     As a result, modtrees never hang on to parts of an environment that
2264 :     has already been rendered "stale" by filtering or rebinding.
2265 :    
2266 :     - I went through many, many trials and errors before arriving at the
2267 :     current solution. (The initial idea of "linkpaths" did not work.)
2268 :     But the result of all this is that I have touched a lot of files that
2269 :     depend on the "modules" and "types" data structures (most of the
2270 :     elaborator). There were a lot of changes during my "linkpath" trials
2271 :     that could have been reverted to their original state but weren't.
2272 :     Please, don't be too harsh on me for messing with this code a bit more
2273 :     than what was strictly necessary... (I _did_ resist the tempation
2274 :     of doing any "global reformatting" to avoid an untimely death at
2275 :     Dave's hands. :)
2276 :    
2277 :     - One positive aspect of the previous point: At least I made sure that
2278 :     all files that I touched now compile without warnings (other than
2279 :     "polyEqual").
2280 :    
2281 :     - compiler now tends to run "leaner" (i.e., ties up less memory in
2282 :     redundant modmaps)
2283 :    
2284 :     ----------------------------------------------------------------------
2285 : leunga 580 Name: Allen Leung
2286 : leunga 585 Date: 2000/03/29 18:00:00
2287 :     Tag: leunga-20000327-mlriscGen_hppa_alpha_x86
2288 : leunga 586 Boot files (optional): ftp://react-ilp.cs.nyu.edu/leunga/110.26.1-sml.boot.x86-unix-20000330.tar.gz
2289 : leunga 585 Description:
2290 :    
2291 :     This update contains *MAJOR* changes to the way code is generated from CPS
2292 :     in the module mlriscGen, and in various backend modules.
2293 :    
2294 :     CHANGES
2295 :     =======
2296 :    
2297 :     1. MLRiscGen: forward propagation fix.
2298 :    
2299 :     There was a bug in forward propagation introduced at about the same time
2300 :     as the MLRISC x86 backend, which prohibits coalescing to be
2301 :     performed effectively in loops.
2302 :    
2303 :     Effect: speed up of loops in RISC architectures.
2304 :     By itself, this actually slowed down certain benchmarks on the x86.
2305 :    
2306 :     2. MLRiscGen: forward propagating addresses from consing.
2307 :    
2308 :     I've changed the way consing code is generated. Basically I separated
2309 :     out the initialization part:
2310 :    
2311 :     store tag, offset(allocptr)
2312 :     store elem1, offset+4(allocptr)
2313 :     store elem2, offset+8(allocptr)
2314 :     ...
2315 :     store elemn, offset+4n(allocptr)
2316 :    
2317 :     and the address computation part:
2318 :    
2319 :     celladdr <- offset+4+alloctpr
2320 :    
2321 :     and move the address computation part
2322 :    
2323 :     Effect: register pressure is generally lower as a result. This
2324 :     makes compilation of certain expressions much faster, such as
2325 :     long lists with non-trivial elements.
2326 :    
2327 :     [(0,0), (0,0), .... (0,0)]
2328 :    
2329 :     3. MLRiscGen: base pointer elimination.
2330 :    
2331 :     As part of the linkage mechanism, we generate the sequence:
2332 :    
2333 :     L: ... <- start of the code fragment
2334 :    
2335 :     L1:
2336 :     base pointer <- linkreg - L1 + L
2337 :    
2338 :     The base pointer was then used for computing relocatable addresses
2339 :     in the code fragment. Frequently (such as in lots of continuations)
2340 :     this is not needed. We now eliminate this sequence whenever possible.
2341 :    
2342 :     For compile time efficiency, I'm using a very stupid local heuristic.
2343 :     But in general, this should be done as a control flow analysis.
2344 :    
2345 :     Effect: Smaller code size. Speed up of most programs.
2346 :    
2347 :     4. Hppa back end
2348 :    
2349 :     Long jumps in span dependence resolution used to depend on the existence
2350 :     of the base pointer.
2351 :    
2352 :     A jump to a long label L was expanded into the following sequence:
2353 :    
2354 :     LDIL %hi(L-8192), %r29
2355 :     LDO %lo(L-8192)(%r29), %r29
2356 :     ADD %r29, baseptr, %r29
2357 :     BV,n %r0(%r29)
2358 :    
2359 :     In the presence of change (3) above, this will not work. I've changed
2360 :     it so that the following sequence of instructions are generated, which
2361 :     doesn't mention the base pointer at all:
2362 :    
2363 :     BL,n L', %r29 /* branch and link, L' + 4 -> %r29 */
2364 :     L': ADDIL L-(L'+4), %r29 /* Compute address of L */
2365 :     BV,n %r0(%r29) /* Jump */
2366 :    
2367 :     5. Alpha back end
2368 :    
2369 :     New alpha instructions LDB/LDW have been added, as per Fermin's
2370 :     suggestions. This is unrelated to all other changes.
2371 :    
2372 :     6. X86 back end
2373 :    
2374 :     I've changed andl to testl in the floating point test sequence
2375 :     whenever appropriate. The Intel optimization guide states that
2376 : monnier 659 testl is preferable to andl.
2377 : leunga 585
2378 :     7. RA (x86 only)
2379 :    
2380 :     I've improved the spill propagation algorithm, using an approximation
2381 :     of maximal weighted independent sets. This seems to be necessary to
2382 :     alleviate the negative effect in light of the slow down in (1).
2383 :    
2384 :     I'll write down the algorithm one of these days.
2385 :    
2386 :     8. MLRiscGen: frequencies
2387 :    
2388 :     I've added an annotation that states that all call gc blocks have zero
2389 :     execution frequencies. This improves register allocation on the x86.
2390 :    
2391 :     BENCHMARKS
2392 :     ==========
2393 :    
2394 :     I've only perform the comparison on 110.25.
2395 :    
2396 :     The platforms are:
2397 :    
2398 :     HPPA A four processor HP machine (E9000) with 5G of memory.
2399 :     X86 A 300Hhz Pentium II with 128M of memory, and
2400 :     SPARC An Ultra sparc 2 with 512M of memory.
2401 :    
2402 :     I used the following parameters for the SML benchmarks:
2403 :    
2404 :     @SMLalloc
2405 :     HPPA 256k
2406 :     SPARC 512k
2407 :     X86 256k
2408 :    
2409 :     COMPILATION TIME
2410 :     ----------------
2411 :     Here are the numbers comparing the compilation times of the compilers.
2412 :     I've only compared 110.25 compiling the new sources versus
2413 :     a fixpoint version of the new compiler compiling the same.
2414 :    
2415 :     110.25 New
2416 :     Total Time in RA Spill+Reload Total Time In RA Spill+Reload
2417 :     HPPA 627s 116s 2684+3584 599s 95s 1003+1879
2418 :     SPARC 892s 173s 2891+3870 708s 116s 1004+1880
2419 :     X86 999s 315s 94006+130691 987s 296s 108877+141957
2420 :    
2421 :     110.25 New
2422 :     Code Size Code Size
2423 :     HPPA 8596736 8561421
2424 :     SPARC 8974299 8785143
2425 :     X86 9029180 8716783
2426 :    
2427 :     So in summary, things are at least as good as before. Dramatic
2428 :     reduction in compilation is obtained on the Sparc; I can't explain it,
2429 :     but it is reproducible. Perhaps someone should try to reproduce this
2430 :     on their own machines.
2431 :    
2432 :     SML BENCHMARKS
2433 :     --------------
2434 :    
2435 :     On the average, all benchmarks perform at least as well as before.
2436 :    
2437 :     HPPA Compilation Time Spill+Reload Run Time
2438 :     110.25 New 110.25 New 110.25 New
2439 :    
2440 :     barnesHut 3.158 3.015 4.75% 1+1 0+0 2.980 2.922 2.00%
2441 :     boyer 6.152 5.708 7.77% 0+0 0+0 0.218 0.213 2.34%
2442 :     count-graphs 1.168 1.120 4.32% 0+0 0+0 22.705 23.073 -1.60%
2443 :     fft 0.877 0.792 10.74% 1+3 1+3 0.602 0.587 2.56%
2444 :     knuthBendix 3.180 2.857 11.32% 0+0 0+0 0.675 0.662 2.02%
2445 :     lexgen 6.190 5.290 17.01% 0+0 0+0 0.913 0.788 15.86%
2446 :     life 0.803 0.703 14.22% 25+25 0+0 0.153 0.140 9.52%
2447 :     logic 2.048 2.007 2.08% 6+6 1+1 4.133 4.008 3.12%
2448 :     mandelbrot 0.077 0.080 -4.17% 0+0 0+0 0.765 0.712 7.49%
2449 :     mlyacc 22.932 20.937 9.53% 154+181 32+57 0.468 0.430 8.91%
2450 :     nucleic 5.183 5.060 2.44% 2+2 0+0 0.125 0.120 4.17%
2451 :     ratio-regions 3.357 3.142 6.84% 0+0 0+0 116.225 113.173 2.70%
2452 :     ray 1.283 1.290 -0.52% 0+0 0+0 2.887 2.855 1.11%
2453 :     simple 6.307 6.032 4.56% 28+30 5+7 3.705 3.658 1.28%
2454 :     tsp 0.888 0.862 3.09% 0+0 0+0 7.040 6.893 2.13%
2455 :     vliw 24.378 23.455 3.94% 106+127 25+45 2.758 2.707 1.91%
2456 :     --------------------------------------------------------------------------
2457 :     Average 6.12% 4.09%
2458 :    
2459 :     SPARC Compilation Time Spill+Reload Run Time
2460 :     110.25 New 110.25 New 110.25 New
2461 :    
2462 :     barnesHut 3.778 3.592 5.20% 2+2 0+0 3.648 3.453 5.65%
2463 :     boyer 6.632 6.110 8.54% 0+0 0+0 0.258 0.242 6.90%
2464 :     count-graphs 1.435 1.325 8.30% 0+0 0+0 33.672 34.737 -3.07%
2465 :     fft 0.980 0.940 4.26% 3+9 2+6 0.838 0.827 1.41%
2466 :     knuthBendix 3.590 3.138 14.39% 0+0 0+0 0.962 0.967 -0.52%
2467 :     lexgen 6.593 6.072 8.59% 1+1 0+0 1.077 1.078 -0.15%
2468 :     life 0.972 0.868 11.90% 26+26 0+0 0.143 0.140 2.38%
2469 :     logic 2.525 2.387 5.80% 7+7 1+1 5.625 5.158 9.05%
2470 :     mandelbrot 0.090 0.093 -3.57% 0+0 0+0 0.855 0.728 17.39%
2471 :     mlyacc 26.732 23.827 12.19% 162+189 32+57 0.550 0.560 -1.79%
2472 :     nucleic 6.233 6.197 0.59% 3+3 0+0 0.163 0.173 -5.77%
2473 :     ratio-regions 3.780 3.507 7.79% 0+0 0+0 133.993 131.035 2.26%
2474 :     ray 1.595 1.550 2.90% 1+1 0+0 3.440 3.418 0.63%
2475 :     simple 6.972 6.487 7.48% 29+32 5+7 3.523 3.525 -0.05%
2476 :     tsp 1.115 1.063 4.86% 0+0 0+0 7.393 7.265 1.77%
2477 :     vliw 27.765 24.818 11.87% 110+135 25+45 2.265 2.135 6.09%
2478 :     ----------------------------------------------------------------------------
2479 :     Average 6.94% 2.64%
2480 :    
2481 :     X86 Compilation Time Spill+Reload Run Time
2482 :     110.25 New 110.25 New 110.25 New
2483 :    
2484 :     barnesHut 5.530 5.420 2.03% 593+893 597+915 3.532 3.440 2.66%
2485 :     boyer 8.768 7.747 13.19% 493+199 301+289 0.327 0.297 10.11%
2486 :     count-graphs 2.040 2.010 1.49% 298+394 315+457 26.578 28.660 -7.26%
2487 :     fft 1.327 1.302 1.92% 112+209 115+210 1.055 0.962 9.71%
2488 :     knuthBendix 5.218 5.475 -4.69% 451+598 510+650 0.928 0.932 -0.36%
2489 :     lexgen 9.970 9.623 3.60% 1014+841 1157+885 0.947 0.928 1.97%
2490 :     life 1.183 1.183 0.00% 162+182 145+148 0.127 0.103 22.58%
2491 :     logic 3.285 3.512 -6.45% 514+684 591+836 5.682 5.577 1.88%
2492 :     mandelbrot 0.147 0.143 2.33% 38+41 33+54 0.703 0.690 1.93%
2493 :     mlyacc 35.457 32.763 8.22% 3496+4564 3611+4860 0.552 0.550 0.30%
2494 :     nucleic 7.100 6.888 3.07% 239+168 201+158 0.175 0.173 0.96%
2495 :     ratio-regions 6.388 6.843 -6.65% 1182+257 981+300 120.142 120.345 -0.17%
2496 :     ray 2.332 2.338 -0.29% 346+398 402+494 3.593 3.540 1.51%
2497 :     simple 9.912 9.903 0.08% 1475+941 1579+1168 3.057 3.178 -3.83%
2498 :     tsp 1.623 1.532 5.98% 266+200 250+211 8.045 7.878 2.12%
2499 :     vliw 33.947 35.470 -4.29% 2629+2774 2877+3171 2.072 1.890 9.61%
2500 :     ----------------------------------------------------------------------------
2501 :     Average 1.22% 3.36%
2502 :    
2503 :     ----------------------------------------------------------------------
2504 :     Name: Allen Leung
2505 : leunga 583 Date: 2000/03/23 16:25:00
2506 :     Tag: leunga-20000323-fix_x86_alpha
2507 :     Description:
2508 :    
2509 :     1. X86 fixes/changes
2510 :    
2511 :     a. The old code generated for SETcc was completely wrong.
2512 :     The Intel optimization guide is VERY misleading.
2513 :    
2514 :     2. ALPHA fixes/changes
2515 :    
2516 :     a. Added the instructions LDBU, LDWU, STB, STW as per Fermin's suggestion.
2517 :     b. Added a new mode byteWordLoadStores to the functor parameter to Alpha()
2518 :     c. Added reassociation code for address computation.
2519 :    
2520 :     ----------------------------------------------------------------------
2521 :     Name: Allen Leung
2522 : leunga 580 Date: 2000/03/22 01:23:00
2523 :     Tag: leunga-20000322-fix_x86_hppa_ra
2524 :     Description:
2525 :    
2526 :     1. X86 fixes/changes
2527 :    
2528 :     a. x86Rewrite bug with MUL3 (found by Lal)
2529 :     b. Added the instructions FSTS, FSTL
2530 :    
2531 :     2. PA-RISC fixes/changes
2532 :    
2533 :     a. B label should not be a delay slot candidate! Why did this work?
2534 :     b. ADDT(32, REG(32, r), LI n) now generates one instruction instead of two,
2535 :     as it should be.
2536 :     c. The assembly syntax for fstds and fstdd was wrong.
2537 :     d. Added the composite instruction COMICLR/LDO, which is the immediate
2538 :     operand variant of COMCLR/LDO.
2539 :    
2540 :     3. Generic MLRISC
2541 :    
2542 :     a. shuffle.sml rewritten to be slightly more efficient
2543 :     b. DIV bug in mltree-simplify fixed (found by Fermin)
2544 :    
2545 :     4. Register Allocator
2546 :    
2547 :     a. I now release the interference graph earlier during spilling.
2548 :     May improve memory usage.
2549 :    
2550 :     ----------------------------------------------------------------------
2551 : blume 577 Name: Matthias Blume
2552 : blume 578 Date: 2000/03/14 14:15:32
2553 :     Tag: blume_main_v110p26p1_2
2554 :     Description:
2555 :    
2556 :     1. Tools.registerStdShellCmdTool (from smlnj/cm/tool.cm) takes an
2557 :     additional argument called "template" which is an optional string that
2558 : monnier 659 specifies the layout of the tool command line. See the CM manual for
2559 : blume 578 explanation.
2560 :    
2561 : monnier 659 2. A special-purpose tool can be "registered" by simply dropping the
2562 : blume 578 corresponding <...>-tool.cm (and/or <...>-ext.cm) into the same
2563 :     directory where the .cm file lives that uses this tool. (The
2564 :     behavior/misfeature until now was to look for the tool description
2565 :     files in the current working directory.) As before, tool description
2566 :     files could also be anchored -- in which case they can live anywhere
2567 :     they like. Following the recent e-mail discussion, this change should
2568 :     make it easier to have special-purpose tools that are shipped together
2569 :     with the sources of the program that uses them.
2570 :    
2571 :     ----------------------------------------------------------------------
2572 :     Name: Matthias Blume
2573 : blume 577 Date: 2000/03/10 07:48:34
2574 :     Tag: blume_main_v110p26p1_1
2575 :     Description:
2576 :    
2577 :     I added a re-written version of Dave's fixpt script to src/system.
2578 :     Changes relative to the original version:
2579 :     - sh-ified (not everybody has ksh)
2580 :     - automatically figures out which architecture it runs on
2581 :     - uses ./makeml a bit more cleverly
2582 :     - never invokes ./installml (and, thus, does not clobber your
2583 :     good and working installation of sml in case something goes wrong)
2584 :     - accepts max iteration count using option "-iter <n>"
2585 :     - accepts a "base" name using option "-base <base>"
2586 :    
2587 :     It does not build any extraneous heap images but directly rebuilds
2588 :     bin- and boot-hierarchies using makeml's "-rebuild" switch. Finally,
2589 :     it can incorporate existing bin- and boot- hierarchies. For example,
2590 :     suppose the base is set to "sml" (which is the default). Then it
2591 :     successively builds
2592 :    
2593 :     sml.bin.<arch>-unix and sml.boot.<arch>-unix
2594 :     then sml1.bin.<arch>-unix and sml1.boot.<arch>-unix
2595 :     then sml2.bin.<arch>-unix and sml2.boot.<arch>-unix
2596 :     ...
2597 :     then sml<n>.bin.<arch>-unix and sml<n>.boot.<arch>-unix
2598 :    
2599 :     and so on. If any of these already exist, it will just use what's
2600 :     there. In particular, many people will have the initial set of bin
2601 :     and boot files around, so this saves time for at least one full
2602 :     rebuild. Having sets of the form <base><k>.{bin,boot}.<arch>-unix for
2603 :     <k>=1,2,... is normally not a good idea when invoking fixpt. However,
2604 :     they might be the result of an earlier partial run of fixpt (which
2605 : monnier 659 perhaps got accidentally killed). In this case, fixpt will quickly
2606 : blume 577 move through what exists before continuing where it left off earlier,
2607 :     and, thus, saves a lot of time.
2608 :    
2609 :     ----------------------------------------------------------------------
2610 : leunga 576 Name: Allen Leung
2611 :     Date: 00/03/10 02:20:00
2612 :     Tag: leunga-20000310-fix_x86_asm_ra
2613 :     Description:
2614 : dbm 570
2615 : leunga 576 More assembly output problems involving the indexed addressing mode
2616 :     on the x86 have been found and corrected. Thanks to Fermin Reig for the
2617 :     fix.
2618 :    
2619 :     The interface and implementation of the register allocator have been changed
2620 :     slightly to accommodate the possibility to skip the register allocation
2621 :     phases completely and go directly to memory allocation. This is needed
2622 :     for C-- use.
2623 :    
2624 : dbm 570 ----------------------------------------------------------------------
2625 : blume 572 Name: Matthias Blume
2626 : blume 575 Date: 00/03/09 10:23:53
2627 :     Tag: blume_main_v110p26p1_0
2628 :     Description:
2629 :    
2630 :     * Complete re-organization of library names. Many libraries have been
2631 :     consolidated so that they share the same path anchor. For example,
2632 :     all MLRISC-related libraries are anchored at MLRISC, most libraries that
2633 :     are SML/NJ-specific are under "smlnj". Notice that names like
2634 :     host-cmb.cm or host-compiler.cm no longer exist. See system/README
2635 :     for a complete description of the new naming scheme. Quick reference:
2636 :    
2637 :     host-cmb.cm -> smlnj/cmb.cm
2638 :     host-compiler.cm -> smlnj/compiler.cm
2639 :     full-cm.cm -> smlnj/cm.cm
2640 :     <arch>-<os>.cm -> smlnj/cmb/<arch>-<os>.cm
2641 :     <arch>-compiler.cm -> smlnj/compiler/<arch>.cm
2642 :    
2643 :     * Bug fixes in CM.
2644 :     - exceptions in user code are being passed through (i.e., reach top level)
2645 :     - more bugs in paranoia mode fixed
2646 :     - bug related to checking group owners fixed
2647 :    
2648 :     * New install.sh script that automagically fetches archive files:
2649 :     The new file config/srcarchiveurl must contain the URL of the
2650 :     (remote) directory that contains bin files (or other source archives).
2651 :     If install.sh does not find the archive locally, it tries to get
2652 :     it from that remote directory.
2653 :     This should simplify installation further: For machines that have
2654 :     access to the internet, just fetch <version>-config.tgz, unpack it,
2655 : monnier 659 edit config/targets, and go (run config/install.sh). The script will
2656 : blume 575 fetch everything else that it might need all by itself.
2657 :    
2658 :     For CVS users, this mechanism is not relevant for source archives, but
2659 :     it is convenient for getting new sets of binfiles.
2660 :    
2661 :     Archives should be tar files compressed with either gzip, compress, or
2662 :     bzip2. The script recognizes .tgz, .tar, tar.gz, tz, .tar.Z, and .tar.bz2.
2663 :    
2664 :     ----------------------------------------------------------------------
2665 :     Name: Matthias Blume
2666 : blume 572 Date: 2000/03/07 04:01:04
2667 :     Tag: blume_main_v110_26_2
2668 : dbm 570 Description:
2669 : blume 572 - size info in BOOTLIST
2670 :     * no fixed upper limits for number of bootfiles or length of
2671 :     bootfile names in runtime
2672 :     * falling back to old behavior if no BOOTLIST size info found
2673 :     - allocation size heuristics in .run-sml
2674 :     * tries to read cache size from /proc/cpuinfo (this is important for
2675 :     small-cache Celeron systems!)
2676 :     - install.sh robustified
2677 :     - CM manual updates
2678 :     - paranoid mode
2679 :     * no more CMB.deliver() (i.e., all done by CMB.make())
2680 :     * can re-use existing sml.boot.* files
2681 :     * init.cmi now treated as library
2682 :     * library stamps for consistency checks
2683 :     - sml.boot.<arch>-<os>/PIDMAP file
2684 :     * This file is read by the CM startup code. This is used to minimize
2685 :     the amount of dynamic state that needs to be stowed away for the
2686 :     purpose of sharing between interactive system and user code.
2687 :     - CM.Anchor.anchor instead of CM.Anchor.{set,cancel}
2688 :     * Upon request by Elsa. Anchors now controlled by get-set-pair
2689 :     like most other CM state variables.
2690 :     - Compiler.CMSA eliminated
2691 :     * No longer supported by CM anyway.
2692 :     - fixed bugs in pickler that kept biting Stefan
2693 :     * past refs to past refs (was caused by the possibility that
2694 :     ad-hoc sharing is more discriminating than hash-cons sharing)
2695 :     * integer overflow on LargeInt.minInt
2696 :     - ml-{lex,yacc} build scripts now use new mechanism
2697 :     for building standalone programs
2698 :     - fixed several gcc -Wall warnings that were caused by missing header
2699 :     files, missing initializations, etc., in runtime (not all warnings
2700 :     eliminated, though)

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