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revision 648, Thu May 25 21:28:21 2000 UTC revision 721, Mon Nov 6 14:03:39 2000 UTC
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11  Date:  Date:
12  Tag: <post-commit CVS tag>  Tag: <post-commit CVS tag>
13  Description:  Description:
14    
15    ----------------------------------------------------------------------
16    Name: Lal George
17    Date: 2000/11/06 09:02:21 EST 2000
18    Tag: Release_110_30
19    Description:
20    
21    - Version 110.30
22    ----------------------------------------------------------------------
23    Name: Matthias Blume
24    Date: 2000/11/04 14:45:00
25    Tag: blume-20001104-mlbuild
26    Description:
27    
28    - Made ml-build faster on startup.
29    - Documentation fixes.
30    
31    ----------------------------------------------------------------------
32    Name: Matthias Blume
33    Date: 2000/11/02 17:00:00 JST
34    Tag: blume-20001102-condcomp
35    Description:
36    
37    - Small tweaks to pickler -- new BOOTFILES!
38    - Version bumped to 110.29.2.
39    - Added conditional compilation facility to init.cmi (see comment there).
40    ----------------------------------------------------------------------
41    Name: Allen Leung
42    Date: 2000/10/23 19:31:00
43    Tag: leunga-20001023-demo-ra
44    
45    1. Minor RA changes that improves spilling on x86 (affects Moby and C-- only)
46    2. Test programs for the graph library updated
47    3. Some new MLRISC demo programs added
48    
49    ----------------------------------------------------------------------
50    Name: Matthias Blume
51    Date: 2000/08/31 22:15:00 JST
52    Tag: blume-20001017-errmsg
53    Description:
54    
55    More error message grief: Where there used to be no messages, there
56    now were some that had bogus error regions.  Fixed.
57    
58    ----------------------------------------------------------------------
59    Name: Matthias Blume
60    Date: 2000/08/31 17:30:00 JST
61    Tag: blume-20001017-v110p29p1
62    Description:
63    
64    I made a version 110.29.1 with new bootfiles.
65    
66    Changes:  Modified pickler/unpickler for faster and leaner unpickling.
67              CM documentation changes and a small bugfix in CM's error reporting.
68    
69    ----------------------------------------------------------------------
70    Name: Lal George
71    Date: 2000/09/27 14:42:35 EDT
72    Tag: george-20000927-nodestatus
73    Description:
74    
75    Changed the type of the nodestatus, so that:
76    
77            SPILLED(~1)             is now SPILLED
78            SPILLED(m) where m>=0   is now MEMREG(m)
79            SPILLED(s) where s<~1   is now SPILL_LOC(~s)
80    
81    ----------------------------------------------------------------------
82    Name: Matthias Blume
83    Date: 2000/09/07 14:45:00 JST
84    Tag: blume-20000907-cmerrmsg
85    Description:
86    
87    Small tweak to CM to avoid getting ML syntax error messages twice.
88    
89    ----------------------------------------------------------------------
90    Name: Matthias Blume
91    Date: 2000/08/31 18:00:00 JST
92    Tag: blume-20000831-cvsbootfiles
93    Description:
94    
95    New URL for boot files (because the 110.29 files on the BL server do
96    now work correctly with my updated install scripts for yacc and lex).
97    
98    ----------------------------------------------------------------------
99    Name: Matthias Blume
100    Date: 2000/08/08 12:33:00 JST
101    Tag: blume-20000808-manual
102    Description:
103    
104    Tiny update to CM manual.
105    
106    ----------------------------------------------------------------------
107    Name: Allen Leung
108    Date: 2000/08/7 19:31:00
109    Tag: leunga-20000807-a-whole-bunch-of-stuff
110    
111      Moby, C--, SSA, x86, machine descriptions etc.  Should only affect C--
112    and Mobdy.
113    
114    1.  x86
115    
116       a.  Fixes to peephole module by John and Dan.
117       b.  Assembly fix to SETcc by Allen.
118       c.  Fix to c-call by John.
119       d.  Fix to spilling by John.  (This one deals with the missing FSTPT case)
120       e.  Instruction selection optimization to SETcc as suggested by John.
121    
122           For example,
123    
124            MV(32, x, COND(32, CMP(32, LT, a, b), LI 1, LI 0))
125    
126           should generate:
127    
128            MOVL a, x
129            SUBL b, x
130            SHRL 31, x
131    
132    2.  IR stuff
133    
134         A bunch of new DJ-graph related algorithms added.  These
135         speed up SSA construction.
136    
137    3.  SSA + Scheduling
138    
139         Added code for SSA and scheduling to the repository
140    
141    ----------------------------------------------------------------------
142    Name: Lal George
143    Date: 2000/07/27 11:53:14 EDT
144    
145    Tag: lal-20000727-linux-ppc
146    Description:
147    
148     Made changes to support Linux PPC.
149     p.s. I have confirmation that the 110.29 boot files work fine.
150    
151    ----------------------------------------------------------------------
152    Name: Matthias Blume
153    Date: 2000/07/27 17:40:00 JST
154    Tag: blume-20000727-scripts
155    Description:
156    
157    !!!! WARNING !!!!
158    You must recompile the runtime system!
159    !!!! WARNING !!!!
160    
161    This is basically another round of script-enhancements:
162    
163    1. sml, ml-build, and ml-makedepend accept options -D and -U to define
164       and undefine CM preprocessor symbols.
165    
166    2. ml-build avoids generating a new heap image if it finds that the
167       existing one is still ok.  (The condition is that no ML file had to
168       be recompiled and all ML files are found to be older that the heap
169       file.)
170    
171       To make this work smoothly, I also hacked the runtime system as
172       well as SMLofNJ.SysInfo to get access to the heap image suffix
173       (.sparc-solaris, ...) that is currently being used.
174    
175       Moreover, the signature of CM.mk_standalone has changed.  See the
176       CM manual.
177    
178    3. ml-makedepend accepts additional options -n, -a, and -o.  (See the
179       CM manual for details.)
180    
181    4. More CM manual updates:
182        - all of the above has been documented.
183        - there is now a section describing the (CM-related) command line
184          arguments that are accepted by the "sml" command
185    
186    ----------------------------------------------------------------------
187    Name: Matthias Blume
188    Date: 2000/07/25 16:20:00 JST
189    Tag: blume-20000725-makedepend
190    Description:
191    
192    Added a script called ml-makedepend.  This can be used in makefiles
193    for Unix' make in a way very similar to the "makedepend" command for
194    C.
195    
196    The script internally uses function CM.sources.
197    
198    Synopsis:
199    
200        ml-makedepend [-f makefile] cmfile targetname
201    
202    The default for the makefile is "makefile" (or "Makefile" should
203    "makefile" not exist).
204    
205    ml-makedepend adds a cmfile/targetname-specific section to this
206    makefile (after removing the previous version of this section).  The
207    section contains a single dependency specification with targetname on
208    the LHS (targetname is an arbitrary name), and a list of files derived
209    from the cmfile on the RHS.  Some of the files on the RHS are
210    ARCH/OPSYS-specific.  Therefore, ml-makedepend inserts references to
211    "make" variables $(ARCH) and $(OPSYS) in place of the corresponding
212    path names.  The makefile writer is responsible for making sure that
213    these variables have correct at the time "make" is invoked.
214    
215    ----------------------------------------------------------------------
216    Name: Matthias Blume
217    Date: 2000/07/22 23:30:00 JST
218    Tag: blume-20000722-urlupdate
219    Description:
220    
221    Changed BOOT and config/srcarchiveurl to point to BL server:
222    
223        ftp://ftp.research.bell-labs.com/dist/smlnj/working/110.29/
224    
225    ----------------------------------------------------------------------
226    Name: Matthias Blume
227    Date: 2000/07/18 18:00:00 JST
228    Tag: blume-20000718-Version_110_29
229    Description:
230    
231    1. Updated src/compiler/TopLevel/main/version.sml to version 110.29
232    
233    2. Updated config/version to 110.29
234    
235    3. Updated config/srcarchiveurl
236    
237    3. New boot files!
238       ftp://ftp.cs.princeton.edu/pub/people/blume/sml/110.29-autofetch
239    
240    ----------------------------------------------------------------------
241    Name: Matthias Blume
242    Date: 2000/07/11 13:58:00 JST
243    Tag: blume-20000711-doctypo
244    Description:
245    
246    Fixed a few typos in CM manual.
247    
248    ----------------------------------------------------------------------
249    Name: Allen Leung
250    Date: 2000/06/15 00:38:00
251    Tag: leunga-20000704-sparc-x86
252    
253    1. x86 peephole improvement sp += k; sp -= k => nop  [from John]
254    2. fix to x86 RET bug [found by Dan Grossman]
255    3. sparc assembly bug fix for ticc instructions [found by Fermin]
256    
257       Affects c-- and moby only
258    
259    ----------------------------------------------------------------------
260    Name: Matthias Blume
261    Date: 2000/07/04 15:26:00
262    Tag: blume-20000704-trigger
263    Description:
264    
265    1. Improvements to CM manual.
266    2. SMLofNJ.Internals.BTrace.trigger reinstated as an alternative way
267       of getting a back-trace.  The function, when called, raises an
268       internal exception which explicitly carries the full back-trace history,
269       so it is unaffected by any intervening handle-raise pairs ("trivial"
270       or not).  The interactive loop will print that history once it arrives
271       at top level.
272       Short of having all exceptions implicitly carry the full history, the
273       recommended way of using this facility is:
274         - compile your program with instrumentation "on"
275         - run it, when it raises an exception, look at the history
276         - if the history is "cut off" because of some handler, go and modify
277           your program so that it explicitly calls BTrace.trigger
278         - recompile (still instrumented), and rerun; look at the full history
279    
280    ----------------------------------------------------------------------
281    Name: Matthias Blume
282    Date: 2000/07/03 15:36:00 JST
283    Tag: blume-20000702-manual
284    Description:
285    
286    Small corrections and updates to CM manual.
287    
288    ----------------------------------------------------------------------
289    Name: Matthias Blume
290    Date: 2000/06/29 16:04:00 JST
291    Tag: blume-20000629-yacctool
292    Description:
293    
294    Changes:
295    
296    1. Class "mlyacc" now takes separate arguments to pass options to
297       generated .sml- and .sig-files independently.
298    2. Corresponding CM manual updates.
299    3. BTrace module now also reports call sites.  (However, for loop clusters
300       it only shows from where the cluster was entered.)  There are associated
301       modifications to core.sml, internals.{sig,sml}, btrace.sml, and btimp.sml.
302    
303    ----------------------------------------------------------------------
304    Name: Matthias Blume
305    Date: 2000/06/27 16:51:00 JST
306    Tag: blume-20000627-noweb
307    Description:
308    
309    Changes:
310    
311     1. Implemented "subdir" and "witness" options for noweb tool.
312        This caused some slight internal changes in CM's tool implementation.
313     2. Fixed bug in "tool plugin" mechanism.  This is essentially cleaning
314        some remaining issues from earlier path anchor changes.
315     3. Updated CM manual accordingly.
316    
317     4. Changed implementation of back-tracing so that I now consider it
318        ready for prime-time.
319    
320        In particular, you don't have to explicitly trigger the back-trace
321        anymore.  Instead, if you are running BTrace-instrumented code and
322        there is an uncaught exception (regardless of whether or not it was
323        raised in instrumented code), the top-level evalloop will print
324        the back-trace.
325    
326        Features:
327    
328          - Instrumented and uninstrumented code work together seemlessly.
329            (Of course, uninstrumented code is never mentioned in actual
330             back-traces.)
331    
332          - Asymptotic time- and space-complexity of instrumented code is
333            equal to that of uninstrumented code.  (This means that
334            tail-recursion is preserved by the instrumentation phase.)
335    
336          - Modules whose code has been instrumented in different sessions
337            work together without problem.
338    
339          - There is no penalty whatsoever on uninstrumented code.
340    
341          - There is no penalty on "raise" expressions, even in
342            instrumented code.
343    
344        A potential bug (or perhaps it is a feature, too):
345    
346          A back-trace reaches no further than the outermost instrumented
347          non-trivial "raise".  Here, a "trivial" raise is one that is the
348          sole RHS of a "handle" rule.  Thus, back-traces reach trough
349    
350               <exp> handle e => raise e
351    
352          and even
353    
354               <exp> handle Foo => raise Bar
355    
356          and, of course, through
357    
358               <exp> handle Foo => ...
359    
360         if the exception was not Foo.
361    
362         Back-traces always reach right through any un-instrumented code
363         including any of its "handle" expressions, trivial or not.
364    
365       To try this out, do the following:
366    
367         - Erase all existing binfiles for your program.
368           (You may keep binfiles for those modules where you think you
369            definitely don't need back-tracing.)
370         - Turn on back-trace instrumentation:
371              SMLofNJ.Internals.BTrace.mode (SOME true);
372         - Recompile your program.  (I.e., run "CM.make" or "use".)
373         - You may now turn instrumentation off again (if you want):
374              SMLofNJ.Internals.BTrace.mode (SOME false);
375         - Run your program as usual.  If it raises an exception that
376           reaches the interactive toplevel, then a back-trace will
377           automatically be printed.  After that, the toplevel loop
378           will print the exception history as usual.
379    
380    ----------------------------------------------------------------------
381    Name: Matthias Blume
382    Date: 2000/06/26 09:56:46 JST
383    Tag: blume-20000626-setup
384    Description:
385    
386    CM: - setup-parameter to "sml" added; this can be used to run arbitrary
387          ML code before and after compiling a file (e.g., to set compiler
388          flags)
389    
390    Compiler: - improved btrace API (in core.sml, internals.{sig,sml})
391              - associated changes to btrace.sml (BTrace instrumentation pass)
392              - cleaner implementation of btimp.sml (BTrace tracing and report
393                module)
394    
395    CM manual: * new path encoding documented
396               * description of setup-parameter to "sml" added
397    
398    The biggest user-visible change to back-tracing is that it is no
399    longer necessary to compile all traced modules within the same
400    session.  (This was a real limitation.)
401    
402    ----------------------------------------------------------------------
403    Name: Matthias Blume
404    Date: 2000/06/24 12:40:00 JST
405    Tag: blume-20000624-startup
406    Description:
407    
408    Fixes startup slowdown problem.  (I was calling SrcPath.sync a _tad_
409    bit too often -- to put it mildly. :)
410    
411    ----------------------------------------------------------------------
412    Name: Matthias Blume
413    Date: 2000/06/23 18:20:00 JST
414    Tag: blume-20000623-btrace
415    Description:
416    
417    This updates adds a backtrace facility to aid programmers in debugging
418    their programs.  This involves the following changes:
419    
420    1. Module system/smlnj/init/core.sml (structure _Core) now has hooks for
421       keeping track of the current call stack.  When programs are compiled
422       in a special mode, the compiler will insert calls to these hooks
423       into the user program.
424       "Hook" means that it is possible for different implementations of
425       back-tracing to register themselves (at different times).
426    
427    2. compiler/MiscUtil/profile/btrace.sml implements the annotation phase
428       as an Absyn.dec->Absyn.dec rewrite.  Normally this phase is turned off.
429       It can be turned on using this call:
430         SMLofNJ.Internals.BTrace.mode (SOME true);
431       Turning it off again:
432         SMLofNJ.Internals.BTrace.mode (SOME false);
433       Querying the current status:
434         SMLofNJ.Internals.BTrace.mode NONE;
435       Annotated programs are about twice as big as normal ones, and they
436       run a factor of 2 to 4 slower with a dummy back-trace plugin (one
437       where all hooks do nothing).  The slowdown with a plugin that is
438       actually useful (such as the one supplied by default) is even greater,
439       but in the case of the default plugin it is still only an constant
440       factor (amortized).
441    
442    3. system/Basis/Implementation/NJ/internals.{sig,sml} have been augmented
443       with a sub-structure BTrace for controlling back-tracing.  In particular,
444       the above-mentioned function "mode" controls whether the annotation
445       phase is invoked by the compiler.  Another important function is
446       "trigger": when called it aborts the current execution and causes
447       the top-level loop to print a full back-trace.
448    
449    4. compiler/MiscUtil/profile/btimp.sml is the current default plugin
450       for back-tracing.  It keeps track of the dynamic call stack and in
451       addition to that it keeps a partial history at each "level" of that
452       stack.  For example, if a tail-calls b, b tail-calls c, and c tail-calls
453       d and b (at separate times, dynamically), then the report will show:
454    
455       GOTO   d
456             /c
457       GOTO  \b
458       CALL   a
459    
460       This shows that there was an initial non-tail call of a, then a
461       tail-call to b or c, looping behavior in a cluster of functions that
462       consist of b and c, and then a goto from that cluster (i.e., either from
463       b or from c) to d.
464    
465       Note that (depending on the user program) the amount of information
466       that the back-trace module has to keep track of at each level is bounded
467       by a constant.  Thus, the whole implementation has the same asymptotical
468       complexity as the original program (both in space and in time).
469    
470    5. compiler/TopLevel/interact/evalloop.sml has been modified to
471       handle the special exception SMLofNJ.Internals.BTrace.BTrace
472       which is raised by the "trigger" function mentioned above.
473    
474    Notes on usage:
475    
476    - Annotated code works well together with unannotated code:
477    Unannotated calls simply do not show up at all in the backtrace.
478    
479    - It is not a good idea to let modules that were annotated during
480    different sessions run at the same time.  This is because the compiler
481    chooses small integers to identify individual functions, and there
482    will be clashes if different modules were compiled in separate sessions.
483    (Nothing will crash, and you will even be told about the clashes, but
484    back-trace information will in general not be useful.)
485    
486    - Back-tracing can be confused by callcc and capture.
487    
488    - The only way of getting a back-trace right now is to explicitly
489    invoke the "trigger" function from your user program.  Eventually, we
490    should make every exception carry back-trace information (if
491    available).  But since this creates more overhead at "raise"-time
492    (similar to the current exnHistory overhead), I have not yet
493    implemented this.  (The implementation will be rather easy.)  With
494    exceptions carrying back-trace information, this facility will be even
495    more useful because users don't need to modify their programs...
496    
497    - While it is possible to compile the compiler with back-trace
498    annotations turned on (I did it to get some confidence in
499    correctness), you must make absolutely sure that core.sml and
500    btimp.sml are compiled WITHOUT annotation!  (core.sml cannot actually
501    be compiled with annotation because there is no core access yet, but
502    if you compile btimp.sml with annotation, then the system will go into
503    an infinite recursion and crash.)
504    Since CM currently does not know about BTrace, the only way to turn
505    annotations on and off for different modules of the compiler is to
506    interrupt CMB.make, change the settings, and re-invoke it.  Of course,
507    this is awkward and clumsy.
508    
509    Sample sessions:
510    
511    Standard ML of New Jersey v110.28.1 [FLINT v1.5], June 5, 2000
512    - SMLofNJ.Internals.BTrace.mode (SOME true);
513    [autoloading]
514    [autoloading done]
515    val it = false : bool
516    - structure X = struct
517    -     fun main n = let
518    -         fun a (x, 0) = d x
519    -           | a (x, n) = b (x, n - 1)
520    -         and b (x, n) = c (x, n)
521    -         and c (x, n) = a (x, n)
522    -         and d x = e (x, 3)
523    -         and e (x, 0) = f x
524    -           | e (x, n) = e (x, n - 1)
525    -         and f 0 = SMLofNJ.Internals.BTrace.trigger ()
526    -           | f n = n * g (n - 1)
527    -         and g n = a (n, 3)
528    -     in
529    -         f n
530    -     end
531    - end;
532    structure X : sig val main : int -> int end
533    - X.main 3;
534    *** BACK-TRACE ***
535    GOTO   stdIn:4.2-13.20: X.main[2].f
536    GOTO-( stdIn:4.2-13.20: X.main[2].e
537    GOTO   stdIn:4.2-13.20: X.main[2].d
538         / stdIn:4.2-13.20: X.main[2].a
539         | stdIn:4.2-13.20: X.main[2].b
540    GOTO-\ stdIn:4.2-13.20: X.main[2].c
541    CALL   stdIn:4.2-13.20: X.main[2].g
542    GOTO   stdIn:4.2-13.20: X.main[2].f
543    GOTO-( stdIn:4.2-13.20: X.main[2].e
544    GOTO   stdIn:4.2-13.20: X.main[2].d
545         / stdIn:4.2-13.20: X.main[2].a
546         | stdIn:4.2-13.20: X.main[2].b
547    GOTO-\ stdIn:4.2-13.20: X.main[2].c
548    CALL   stdIn:4.2-13.20: X.main[2].g
549    GOTO   stdIn:4.2-13.20: X.main[2].f
550    GOTO-( stdIn:4.2-13.20: X.main[2].e
551    GOTO   stdIn:4.2-13.20: X.main[2].d
552         / stdIn:4.2-13.20: X.main[2].a
553         | stdIn:4.2-13.20: X.main[2].b
554    GOTO-\ stdIn:4.2-13.20: X.main[2].c
555    CALL   stdIn:4.2-13.20: X.main[2].g
556    GOTO   stdIn:4.2-13.20: X.main[2].f
557    CALL   stdIn:2.15-17.4: X.main[2]
558    -
559    
560    (Note that because of a FLINt bug the above code currently does not
561    compile without BTrace turned on.)
562    
563    Here is another example, using my modified Tiger compiler:
564    
565    Standard ML of New Jersey v110.28.1 [FLINT v1.5], June 5, 2000
566    - SMLofNJ.Internals.BTrace.mode (SOME true);
567    [autoloading]
568    [autoloading done]
569    val it = false : bool
570    - CM.make "sources.cm";
571    [autoloading]
572    ...
573    [autoloading done]
574    [scanning sources.cm]
575    [parsing (sources.cm):parse.sml]
576    [creating directory CM/SKEL ...]
577    [parsing (sources.cm):tiger.lex.sml]
578    ...
579    [wrote CM/sparc-unix/semant.sml]
580    [compiling (sources.cm):main.sml]
581    [wrote CM/sparc-unix/main.sml]
582    [New bindings added.]
583    val it = true : bool
584    - Main.compile ("../testcases/merge.tig", "foo.out");
585    *** BACK-TRACE ***
586    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trvar
587    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
588    CALL   lib/semant.sml:289.3-295.22: SemantFun[2].transExp.trexp.check[2]
589    GOTO   lib/semant.sml:289.3-295.22: SemantFun[2].transExp.trexp.check[2]
590    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
591    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
592    CALL   lib/semant.sml:488.3-505.6: SemantFun[2].transDec.trdec[2].transBody[2]
593         / lib/semant.sml:411.65-543.8: SemantFun[2].transDec
594    CALL-\ lib/semant.sml:413.2-540.9: SemantFun[2].transDec.trdec[2]
595    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
596    CALL   lib/semant.sml:8.52-558.4: SemantFun[2].transProg[2]
597    CALL   main.sml:1.18-118.4: Main.compile[2]
598    -
599    
600    ----------------------------------------------------------------------
601    Name: Matthias Blumen
602    Date: 2000/06/21 18:00:00 JST
603    Tag: blume-20000621-manual
604    Description:
605    
606    CM manual update: Path environments documented.
607    
608    ----------------------------------------------------------------------
609    Name: Matthias Blume
610    Date: 2000/06/19 13:40:00
611    Tag: blume-20000619-manual
612    Description:
613    
614    CM manual and system/README update.  This only covers the fact that
615    there are no more implicit anchors.  (Path environments and the "bind"
616    option to "cm" have yet to be documented.)
617    
618    ----------------------------------------------------------------------
619    Name: Matthias Blume
620    Date: 2000/06/19 11:05:00 JST
621    Tag: blume-20000619-chdir-bugfix
622    Description:
623    
624    Fixed a bug in new SrcPath module that sometimes led to a bad chDir call.
625    
626    ----------------------------------------------------------------------
627    Name: Matthias Blume
628    Date: 2000/06/18 22:00:10 JST
629    Tag: blume-20000618-implicit-anchors-really-gone
630    Description:
631    
632    I updates the previous HISTORY entry where I forgot to mention that
633    implicit anchors are no longer with us.
634    
635    The current update also gets rid of the (now useless) controller
636    CM.Control.implicit_anchors.
637    
638    ----------------------------------------------------------------------
639    Name: Matthias Blume
640    Date: 2000/06/16 17:30:00 JST
641    Tag: blume-20000616-anchorenv
642    Description:
643    
644    This patch implements the long anticipated (just kidding :) "anchor
645    environment" mechanism.  In the course of doing this, I also
646    re-implemented CM's internal "SrcPath" module from scratch.  The new
647    one should be more robust in certain boundary cases.  In any case, it
648    is a lot cleaner than its predecessor (IMHO).
649    
650    This time, although there is yet another boot file format change, I
651    kept the unpickler backward-compatible.  As a result, no new bootfiles
652    are necessary and bootstrapping is straightforward.  (You cannot read
653    new bootfiles into an old system, but the other way around is no
654    problem.)
655    
656    Visible changes:
657    
658    ** 0. Implicit path anchors (without the leading $-symbol) are no
659    longer recognized at all. This means that such path names are not
660    illegal either.  For example, the name basis.cm simply refers to a
661    local file called "basis.cm" (i.e, the name is an ordinary path
662    relative to .cm-files directory).  Or, to put it differently, only
663    names that start with $ are anchored paths.
664    
665    ** 1. The $<singlearc> abbreviation for $/<singlearc> has finally
666    vanished.
667    
668    John (Reppy) had critizised this as soon as I originally proposed and
669    implemented it, but at that time I did not really deeply believe
670    him. :) Now I came full-circle because I need the $<singlearc> syntax
671    in another place where it cannot be seen as an abbreviation for
672    $/<singlearc>.  To avoid the confusion, $<singlearc> now means what it
673    seems to mean (i.e., it "expands" into the corresponding anchor
674    value).
675    
676    However, when paths are used as members in CM description files, it
677    continues to be true that there must be at least another arc after the
678    anchor.  This is now enforced separately during semantic analysis
679    (i.e., from a lexical/syntactical point of view, the notation is ok.)
680    
681    ** 2. The "cm" class now accepts an option "bind".  The option's value
682    is a sub-option list of precisely two items -- one labeled "anchor"
683    and the other one labeled "value".  As you might expect, "anchor" is
684    used to specify an anchor name to be bound, and "value" specifies what
685    the anchor is being bound to.
686    
687    The value must be a directory name and can be given in either standard
688    syntax (including the possibility that it is itself an anchored path)
689    or native syntax.
690    
691    Examples:
692    
693       foo.cm (bind:(anchor:bar value:$mystuff/bar))
694       lib.cm (bind:(anchor:a value:"H:\\x\\y\\z"))  (* only works under windows *)
695    
696    and so on.
697    
698    The meaning of this is that the .cm-file will be processed with an
699    augmented anchor environment where the given anchor(s) is/are bound to
700    the given values(s).
701    
702    The rationale for having this feature is this: Suppose you are trying
703    to use two different (already stable) libraries a.cm and b.cm (that
704    you perhaps didn't write yourself).  Further, suppose each of these
705    two libraries internally uses its own auxiliary library $aux/lib.cm.
706    Normally you would now have a problem because the anchor "lib" can not
707    be bound to more than one value globally.  Therefore, the project that
708    uses both a.cm and b.cm must locally redirect the anchor to some other
709    place:
710    
711       a.cm (bind:(anchor:lib value:/usr/lib/smlnj/a-stuff))
712       b.cm (bind:(anchor:lib value:/usr/lib/smlnj/b-stuff))
713    
714    This hard-wires $lib/aux.cm to /usr/lib/smlnj/a-stuff/aux.cm or
715    /usr/lib/smlnj/b-stuff/aux.cm, respectively.
716    
717    Hard-wiring path names is a bit inflexible (and CM will verbosely warn
718    you when you do so at the time of CM.stabilize).  Therefore, you can
719    also use an anchored path as the value:
720    
721      a.cm (bind:(anchor:lib value:$a-lib))
722      b.cm (bind:(anchor:lib value:$b-lib))
723    
724    Now you can globally configure (using the usual CM.Anchor.anchor or
725    pathconfig machinery) bindings for "a-lib" and "b-lib".  Since "lib"
726    itself is always locally bound, setting it globally is no longer
727    meaningful or necessary (but it does not hurt either).  In fact, "lib"
728    can still be used as a global anchor for separate purposes.  As a
729    matter of fact, one can locally define "lib" in terms of a global
730    "lib":
731    
732      a.cm (bind:(anchor:lib value:$lib/a))
733      b.cm (bind:(anchor:lib value:$lib/b))
734    
735    ** 3: The encoding of path names has changed.  This affects the way
736    path names are shown in CM's progress report and also the internal
737    protocol encoding used for parallel make.
738    
739    The encoding now uses one or more ':'-separated segments.  Each
740    segments corresponds to a file that has been specified relative to the
741    file given by its preceding segment.  The first segment is either
742    relative to the CWD, absolute, or anchored.  Each segment itself is
743    basically a Unix pathname; all segments but the first are relative.
744    
745    Example:
746    
747       $foo/bar/baz.cm:a/b/c.sml
748    
749    This path denotes the file bar/a/b/c.sml relative to the directory
750    denoted by anchor "foo".  Notice that the encoding also includes
751    baz.cm which is the .cm-file that listed a/b/c.sml.  As usual, such
752    paths are resolved relative to the .cm-files directory, so baz.cm must
753    be ignored to get the "real" pathname.
754    
755    To make this fact more obvious, CM puts the names of such "virtual
756    arcs" into parentheses when they appear in progress reports. (No
757    parentheses will appear in the internal protocol encoding.)  Thus,
758    what you really see is:
759    
760      $foo/bar/(baz.cm):a/b/c.sml
761    
762    I find this notation to be much more informative than before.
763    
764    Another new feature of the encoding is that special characters
765    including parentheses, colons, (back)slashes, and white space are
766    written as \ddd (where ddd is the decimal encoding of the character).
767    
768    *** The CM manual still needs to be updated.
769    
770    ----------------------------------------------------------------------
771    Name: Allen Leung
772    Date: 2000/06/15 00:38:00
773    Tag: leunga-20000615-x86-peephole
774    
775    x86 Peephole fix by Fermin.  Affects c-- and moby only.
776    
777    ----------------------------------------------------------------------
778    Name: Matthias Blume
779    Date: 2000/06/12 11:40:00
780    Tag: blume-20000612-parmakefix
781    Description:
782    
783    More cleanup after changing the file naming scheme: This time I
784    repaired the parallel make mechanism for CMB.make which I broke earlier.
785    
786    ----------------------------------------------------------------------
787    Name: Allen Leung
788    Date: 2000/06/09 01:25:00
789    Tag: leunga-20000609-various
790    
791    None of these things should affect normal SML/NJ operations
792    
793    1. Peephole improvements provided by Fermin (c--)
794    2. New annotation DEFUSE for adding extra dependence (moby)
795    3. New X86 LOCK instructions (moby)
796    4. New machine description language for reservation tables (scheduling)
797    5. Fixes to various optimization/analysis modules (branch chaining, dominator
798       trees etc.)
799    6. I've changed the CM files so that they can work with versions
800       110.0.6, 110.25 and 110.28
801    
802    ----------------------------------------------------------------------
803    Name: Matthias Blume
804    Date: 2000/06/09 12:40:00
805    Tag: blume-20000609-log
806    Description:
807    
808    - Removed all(?) remaining RCS Log entries from sources.
809    
810    - Fixed bug in ml-yacc and ml-lex sources (use explicit anchors for
811      anchored paths).
812    
813    ----------------------------------------------------------------------
814    Name: Matthias Blume
815    Date: 2000/06/07 17:00:00 JST
816    Tag: blume-20000607-no-implicit-anchors
817    Description:
818    
819    1. This update changes the default setting for
820    CM.Control.implicit_anchors from true to false.  This means that
821    implicit anchors are no longer permitted by default.  I also tried to
822    make sure that nothing else still relies on implicit anchors.
823    (This is the next step on the schedule towards a CM that does not even
824    have the notion of implicit anchors anymore.)
825    
826    2. More CM manual updates.
827    
828    3. I managed to track down and fix the pickling bug I mentioned last
829    time.  Because of the previously existing workaround, this entails no
830    immediate practical changes.
831    
832    ----------------------------------------------------------------------
833    Name: Matthias Blume
834    Date: 2000/06/06 11:15:00 JST
835    Tag: blume-20000606-lazierpickle
836    Description:
837    
838    !!!! NEW BOOT FILES !!!!
839    
840    * The main purpose of this update is to make library pickles lazier in
841    order to reduce the initial space penalty for autoloading a library.
842    As a result, it is now possible to have $smlnj/compiler.cm
843    pre-registered.  This should take care of the many complaints or
844    inquiries about missing structure Compiler.  This required changes to
845    CM's internal data structures and small tweaks to some algorithms.
846    
847    As a neat additional effect, it is no longer necessary (for the sake
848    of lean heap image files) to distinguish between a "minimal" CM and a
849    "full" CM.  Now, there is only one CM (i.e., the "full" version:
850    $smlnj/cm.cm aka $smlnj/cm/full.cm), and it is always available at the
851    interactive top level. ($smlnj/cm/minimal.cm is gone.)
852    
853    To make the life of compiler-hackers easier, "makeml" now also
854    pre-registers $smlnj/cmb.cm (aka $smlnj/cmb/current.cm).  In other
855    words, after you bootstrap a new sml for the first time, you will not
856    have to autoload $smlnj/cmb.cm again afterwards.  (The first time
857    around you will still have to do it, though.)
858    
859    * A second change consists of major updates to the CM manual.  There
860    are now several appendices with summary information and also a full
861    specification of the CM description file syntax.
862    
863    * In directory src/system I added the script "allcross".  This script
864    invokes sml and cross-compiles the compiler for all supported
865    architectures.  (Useful when providing a new set of boot files.)
866    
867    * There seems to be a latent bug in my "lazy pickles" mechanism.  I
868    added a small tweak to pickle-util.sml to work around this problem,
869    but it is not a proper fix yet.  I will investigate further.  (The
870    effect of the bug was an inflation of library pickle size.)
871    
872    * Version number increased to 110.28.1 (to avoid compatibility problems).
873    
874  ----------------------------------------------------------------------  ----------------------------------------------------------------------
875  Name: Allen Leung  Name: Allen Leung
876  Date: 2000/05/25 17:28 EDT  Date: 2000/05/25 17:28 EDT
# Line 502  Line 1362 
1362    
1363  3.  Assembly  3.  Assembly
1364    
1365      When generating assemby, resolve the value of client defined constants,      When generating assembly, resolve the value of client defined constants,
1366      instead of generating symbolic values.  This is controlled by the      instead of generating symbolic values.  This is controlled by the
1367      new flag "asm-resolve-constants", which is default to true.      new flag "asm-resolve-constants", which is default to true.
1368    
# Line 525  Line 1385 
1385    
1386  To this end, I arranged that instead of "structure Core" as "structure  To this end, I arranged that instead of "structure Core" as "structure
1387  _Core" is bound in the pervasive environment.  Core access is done via  _Core" is bound in the pervasive environment.  Core access is done via
1388  _Core (which can never be accidentially rebound because _Core is not a  _Core (which can never be accidentally rebound because _Core is not a
1389  legal surface-syntax symbol).  legal surface-syntax symbol).
1390    
1391  The current solution is much cleaner because the core environment is  The current solution is much cleaner because the core environment is
# Line 535  Line 1395 
1395  with dynamic and symbolic parts of the core environment.  with dynamic and symbolic parts of the core environment.
1396    
1397  Remaining hackery (to bind the "magic" symbol _Core) is localized in the  Remaining hackery (to bind the "magic" symbol _Core) is localized in the
1398  compilation mananger's bootstrap compiler (actually: in the "init group"  compilation manager's bootstrap compiler (actually: in the "init group"
1399  handling).  See the comments in src/system/smlnj/init/init.cmi for  handling).  See the comments in src/system/smlnj/init/init.cmi for
1400  more details.  more details.
1401    
# Line 650  Line 1510 
1510     (specified in the .cm file at each instance where the tool's class is     (specified in the .cm file at each instance where the tool's class is
1511     used).     used).
1512    
1513     This was done to accomodate the new "make" and "shell" tools which     This was done to accommodate the new "make" and "shell" tools which
1514     facilitate fairly seemless hookup to portions of code managed using     facilitate fairly seamless hookup to portions of code managed using
1515     Makefiles or Shell scripts.     Makefiles or Shell scripts.
1516    
1517     There are no classes "shared" or "private" anymore.  Instead, the     There are no classes "shared" or "private" anymore.  Instead, the
# Line 663  Line 1523 
1523    
1524     All existing tools are described in the CM manual.     All existing tools are described in the CM manual.
1525    
1526     - Slightly better error handling.  (CM now surpresses many followup     - Slightly better error handling.  (CM now suppresses many followup
1527     error messages that tended to be more annoying than helpful.)     error messages that tended to be more annoying than helpful.)
1528    
1529  2. Major changes to the compiler's static environment data structures.  2. Major changes to the compiler's static environment data structures.
# Line 797  Line 1657 
1657    
1658       I've changed andl to testl in the floating point test sequence       I've changed andl to testl in the floating point test sequence
1659       whenever appropriate.  The Intel optimization guide states that       whenever appropriate.  The Intel optimization guide states that
1660       testl is perferable to andl.       testl is preferable to andl.
1661    
1662  7. RA (x86 only)  7. RA (x86 only)
1663    
# Line 979  Line 1839 
1839    
1840  1. Tools.registerStdShellCmdTool (from smlnj/cm/tool.cm) takes an  1. Tools.registerStdShellCmdTool (from smlnj/cm/tool.cm) takes an
1841  additional argument called "template" which is an optional string that  additional argument called "template" which is an optional string that
1842  specifiel the layout of the tool command line.  See the CM manual for  specifies the layout of the tool command line.  See the CM manual for
1843  explanation.  explanation.
1844    
1845  2. A special-purpose tool can be "regisitered" by simply dropping the  2. A special-purpose tool can be "registered" by simply dropping the
1846  corresponding <...>-tool.cm (and/or <...>-ext.cm) into the same  corresponding <...>-tool.cm (and/or <...>-ext.cm) into the same
1847  directory where the .cm file lives that uses this tool.  (The  directory where the .cm file lives that uses this tool.  (The
1848  behavior/misfeature until now was to look for the tool description  behavior/misfeature until now was to look for the tool description
# Line 1026  Line 1886 
1886  rebuild.  Having sets of the form <base><k>.{bin,boot}.<arch>-unix for  rebuild.  Having sets of the form <base><k>.{bin,boot}.<arch>-unix for
1887  <k>=1,2,... is normally not a good idea when invoking fixpt.  However,  <k>=1,2,... is normally not a good idea when invoking fixpt.  However,
1888  they might be the result of an earlier partial run of fixpt (which  they might be the result of an earlier partial run of fixpt (which
1889  perhaps got accidentially killed).  In this case, fixpt will quickly  perhaps got accidentally killed).  In this case, fixpt will quickly
1890  move through what exists before continuing where it left off earlier,  move through what exists before continuing where it left off earlier,
1891  and, thus, saves a lot of time.  and, thus, saves a lot of time.
1892    
# Line 1076  Line 1936 
1936    it from that remote directory.    it from that remote directory.
1937    This should simplify installation further:  For machines that have    This should simplify installation further:  For machines that have
1938    access to the internet, just fetch <version>-config.tgz, unpack it,    access to the internet, just fetch <version>-config.tgz, unpack it,
1939    edit config/targets, and go (run config/install.sh).  The scipt will    edit config/targets, and go (run config/install.sh).  The script will
1940    fetch everything else that it might need all by itself.    fetch everything else that it might need all by itself.
1941    
1942    For CVS users, this mechanism is not relevant for source archives, but    For CVS users, this mechanism is not relevant for source archives, but

Legend:
Removed from v.648  
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  Added in v.721

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