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revision 627, Tue Apr 25 20:40:35 2000 UTC revision 701, Thu Aug 31 08:46:43 2000 UTC
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12  Tag: <post-commit CVS tag>  Tag: <post-commit CVS tag>
13  Description:  Description:
14  ----------------------------------------------------------------------  ----------------------------------------------------------------------
15    Name: Matthias Blume
16    Date: 2000/08/31 18:00:00 JST
17    Tag: blume-20000831-cvsbootfiles
18    Description:
19    
20    New URL for boot files (because the 110.29 files on the BL server do
21    now work correctly with my updated install scripts for yacc and lex).
22    
23    ----------------------------------------------------------------------
24    Name: Matthias Blume
25    Date: 2000/08/08 12:33:00 JST
26    Tag: blume-20000808-manual
27    Description:
28    
29    Tiny update to CM manual.
30    
31    ----------------------------------------------------------------------
32    Name: Allen Leung
33    Date: 2000/08/7 19:31:00
34    Tag: leunga-20000807-a-whole-bunch-of-stuff
35    
36      Moby, C--, SSA, x86, machine descriptions etc.  Should only affect C--
37    and Mobdy.
38    
39    1.  x86
40    
41       a.  Fixes to peephole module by John and Dan.
42       b.  Assembly fix to SETcc by Allen.
43       c.  Fix to c-call by John.
44       d.  Fix to spilling by John.  (This one deals with the missing FSTPT case)
45       e.  Instruction selection optimization to SETcc as suggested by John.
46    
47           For example,
48    
49            MV(32, x, COND(32, CMP(32, LT, a, b), LI 1, LI 0))
50    
51           should generate:
52    
53            MOVL a, x
54            SUBL b, x
55            SHRL 31, x
56    
57    2.  IR stuff
58    
59         A bunch of new DJ-graph related algorithms added.  These
60         speed up SSA construction.
61    
62    3.  SSA + Scheduling
63    
64         Added code for SSA and scheduling to the repository
65    
66    ----------------------------------------------------------------------
67    Name: Lal George
68    Date: 2000/07/27 11:53:14 EDT
69    
70    Tag: lal-20000727-linux-ppc
71    Description:
72    
73     Made changes to support Linux PPC.
74     p.s. I have confirmation that the 110.29 boot files work fine.
75    
76    ----------------------------------------------------------------------
77    Name: Matthias Blume
78    Date: 2000/07/27 17:40:00 JST
79    Tag: blume-20000727-scripts
80    Description:
81    
82    !!!! WARNING !!!!
83    You must recompile the runtime system!
84    !!!! WARNING !!!!
85    
86    This is basically another round of script-enhancements:
87    
88    1. sml, ml-build, and ml-makedepend accept options -D and -U to define
89       and undefine CM preprocessor symbols.
90    
91    2. ml-build avoids generating a new heap image if it finds that the
92       existing one is still ok.  (The condition is that no ML file had to
93       be recompiled and all ML files are found to be older that the heap
94       file.)
95    
96       To make this work smoothly, I also hacked the runtime system as
97       well as SMLofNJ.SysInfo to get access to the heap image suffix
98       (.sparc-solaris, ...) that is currently being used.
99    
100       Moreover, the signature of CM.mk_standalone has changed.  See the
101       CM manual.
102    
103    3. ml-makedepend accepts additional options -n, -a, and -o.  (See the
104       CM manual for details.)
105    
106    4. More CM manual updates:
107        - all of the above has been documented.
108        - there is now a section describing the (CM-related) command line
109          arguments that are accepted by the "sml" command
110    
111    ----------------------------------------------------------------------
112    Name: Matthias Blume
113    Date: 2000/07/25 16:20:00 JST
114    Tag: blume-20000725-makedepend
115    Description:
116    
117    Added a script called ml-makedepend.  This can be used in makefiles
118    for Unix' make in a way very similar to the "makedepend" command for
119    C.
120    
121    The script internally uses function CM.sources.
122    
123    Synopsis:
124    
125        ml-makedepend [-f makefile] cmfile targetname
126    
127    The default for the makefile is "makefile" (or "Makefile" should
128    "makefile" not exist).
129    
130    ml-makedepend adds a cmfile/targetname-specific section to this
131    makefile (after removing the previous version of this section).  The
132    section contains a single dependency specification with targetname on
133    the LHS (targetname is an arbitrary name), and a list of files derived
134    from the cmfile on the RHS.  Some of the files on the RHS are
135    ARCH/OPSYS-specific.  Therefore, ml-makedepend inserts references to
136    "make" variables $(ARCH) and $(OPSYS) in place of the corresponding
137    path names.  The makefile writer is responsible for making sure that
138    these variables have correct at the time "make" is invoked.
139    
140    ----------------------------------------------------------------------
141    Name: Matthias Blume
142    Date: 2000/07/22 23:30:00 JST
143    Tag: blume-20000722-urlupdate
144    Description:
145    
146    Changed BOOT and config/srcarchiveurl to point to BL server:
147    
148        ftp://ftp.research.bell-labs.com/dist/smlnj/working/110.29/
149    
150    ----------------------------------------------------------------------
151    Name: Matthias Blume
152    Date: 2000/07/18 18:00:00 JST
153    Tag: blume-20000718-Version_110_29
154    Description:
155    
156    1. Updated src/compiler/TopLevel/main/version.sml to version 110.29
157    
158    2. Updated config/version to 110.29
159    
160    3. Updated config/srcarchiveurl
161    
162    3. New boot files!
163       ftp://ftp.cs.princeton.edu/pub/people/blume/sml/110.29-autofetch
164    
165    ----------------------------------------------------------------------
166    Name: Matthias Blume
167    Date: 2000/07/11 13:58:00 JST
168    Tag: blume-20000711-doctypo
169    Description:
170    
171    Fixed a few typos in CM manual.
172    
173    ----------------------------------------------------------------------
174    Name: Allen Leung
175    Date: 2000/06/15 00:38:00
176    Tag: leunga-20000704-sparc-x86
177    
178    1. x86 peephole improvement sp += k; sp -= k => nop  [from John]
179    2. fix to x86 RET bug [found by Dan Grossman]
180    3. sparc assembly bug fix for ticc instructions [found by Fermin]
181    
182       Affects c-- and moby only
183    
184    ----------------------------------------------------------------------
185    Name: Matthias Blume
186    Date: 2000/07/04 15:26:00
187    Tag: blume-20000704-trigger
188    Description:
189    
190    1. Improvements to CM manual.
191    2. SMLofNJ.Internals.BTrace.trigger reinstated as an alternative way
192       of getting a back-trace.  The function, when called, raises an
193       internal exception which explicitly carries the full back-trace history,
194       so it is unaffected by any intervening handle-raise pairs ("trivial"
195       or not).  The interactive loop will print that history once it arrives
196       at top level.
197       Short of having all exceptions implicitly carry the full history, the
198       recommended way of using this facility is:
199         - compile your program with instrumentation "on"
200         - run it, when it raises an exception, look at the history
201         - if the history is "cut off" because of some handler, go and modify
202           your program so that it explicitly calls BTrace.trigger
203         - recompile (still instrumented), and rerun; look at the full history
204    
205    ----------------------------------------------------------------------
206    Name: Matthias Blume
207    Date: 2000/07/03 15:36:00 JST
208    Tag: blume-20000702-manual
209    Description:
210    
211    Small corrections and updates to CM manual.
212    
213    ----------------------------------------------------------------------
214    Name: Matthias Blume
215    Date: 2000/06/29 16:04:00 JST
216    Tag: blume-20000629-yacctool
217    Description:
218    
219    Changes:
220    
221    1. Class "mlyacc" now takes separate arguments to pass options to
222       generated .sml- and .sig-files independently.
223    2. Corresponding CM manual updates.
224    3. BTrace module now also reports call sites.  (However, for loop clusters
225       it only shows from where the cluster was entered.)  There are associated
226       modifications to core.sml, internals.{sig,sml}, btrace.sml, and btimp.sml.
227    
228    ----------------------------------------------------------------------
229    Name: Matthias Blume
230    Date: 2000/06/27 16:51:00 JST
231    Tag: blume-20000627-noweb
232    Description:
233    
234    Changes:
235    
236     1. Implemented "subdir" and "witness" options for noweb tool.
237        This caused some slight internal changes in CM's tool implementation.
238     2. Fixed bug in "tool plugin" mechanism.  This is essentially cleaning
239        some remaining issues from earlier path anchor changes.
240     3. Updated CM manual accordingly.
241    
242     4. Changed implementation of back-tracing so that I now consider it
243        ready for prime-time.
244    
245        In particular, you don't have to explicitly trigger the back-trace
246        anymore.  Instead, if you are running BTrace-instrumented code and
247        there is an uncaught exception (regardless of whether or not it was
248        raised in instrumented code), the top-level evalloop will print
249        the back-trace.
250    
251        Features:
252    
253          - Instrumented and uninstrumented code work together seemlessly.
254            (Of course, uninstrumented code is never mentioned in actual
255             back-traces.)
256    
257          - Asymptotic time- and space-complexity of instrumented code is
258            equal to that of uninstrumented code.  (This means that
259            tail-recursion is preserved by the instrumentation phase.)
260    
261          - Modules whose code has been instrumented in different sessions
262            work together without problem.
263    
264          - There is no penalty whatsoever on uninstrumented code.
265    
266          - There is no penalty on "raise" expressions, even in
267            instrumented code.
268    
269        A potential bug (or perhaps it is a feature, too):
270    
271          A back-trace reaches no further than the outermost instrumented
272          non-trivial "raise".  Here, a "trivial" raise is one that is the
273          sole RHS of a "handle" rule.  Thus, back-traces reach trough
274    
275               <exp> handle e => raise e
276    
277          and even
278    
279               <exp> handle Foo => raise Bar
280    
281          and, of course, through
282    
283               <exp> handle Foo => ...
284    
285         if the exception was not Foo.
286    
287         Back-traces always reach right through any un-instrumented code
288         including any of its "handle" expressions, trivial or not.
289    
290       To try this out, do the following:
291    
292         - Erase all existing binfiles for your program.
293           (You may keep binfiles for those modules where you think you
294            definitely don't need back-tracing.)
295         - Turn on back-trace instrumentation:
296              SMLofNJ.Internals.BTrace.mode (SOME true);
297         - Recompile your program.  (I.e., run "CM.make" or "use".)
298         - You may now turn instrumentation off again (if you want):
299              SMLofNJ.Internals.BTrace.mode (SOME false);
300         - Run your program as usual.  If it raises an exception that
301           reaches the interactive toplevel, then a back-trace will
302           automatically be printed.  After that, the toplevel loop
303           will print the exception history as usual.
304    
305    ----------------------------------------------------------------------
306    Name: Matthias Blume
307    Date: 2000/06/26 09:56:46 JST
308    Tag: blume-20000626-setup
309    Description:
310    
311    CM: - setup-parameter to "sml" added; this can be used to run arbitrary
312          ML code before and after compiling a file (e.g., to set compiler
313          flags)
314    
315    Compiler: - improved btrace API (in core.sml, internals.{sig,sml})
316              - associated changes to btrace.sml (BTrace instrumentation pass)
317              - cleaner implementation of btimp.sml (BTrace tracing and report
318                module)
319    
320    CM manual: * new path encoding documented
321               * description of setup-parameter to "sml" added
322    
323    The biggest user-visible change to back-tracing is that it is no
324    longer necessary to compile all traced modules within the same
325    session.  (This was a real limitation.)
326    
327    ----------------------------------------------------------------------
328    Name: Matthias Blume
329    Date: 2000/06/24 12:40:00 JST
330    Tag: blume-20000624-startup
331    Description:
332    
333    Fixes startup slowdown problem.  (I was calling SrcPath.sync a _tad_
334    bit too often -- to put it mildly. :)
335    
336    ----------------------------------------------------------------------
337    Name: Matthias Blume
338    Date: 2000/06/23 18:20:00 JST
339    Tag: blume-20000623-btrace
340    Description:
341    
342    This updates adds a backtrace facility to aid programmers in debugging
343    their programs.  This involves the following changes:
344    
345    1. Module system/smlnj/init/core.sml (structure _Core) now has hooks for
346       keeping track of the current call stack.  When programs are compiled
347       in a special mode, the compiler will insert calls to these hooks
348       into the user program.
349       "Hook" means that it is possible for different implementations of
350       back-tracing to register themselves (at different times).
351    
352    2. compiler/MiscUtil/profile/btrace.sml implements the annotation phase
353       as an Absyn.dec->Absyn.dec rewrite.  Normally this phase is turned off.
354       It can be turned on using this call:
355         SMLofNJ.Internals.BTrace.mode (SOME true);
356       Turning it off again:
357         SMLofNJ.Internals.BTrace.mode (SOME false);
358       Querying the current status:
359         SMLofNJ.Internals.BTrace.mode NONE;
360       Annotated programs are about twice as big as normal ones, and they
361       run a factor of 2 to 4 slower with a dummy back-trace plugin (one
362       where all hooks do nothing).  The slowdown with a plugin that is
363       actually useful (such as the one supplied by default) is even greater,
364       but in the case of the default plugin it is still only an constant
365       factor (amortized).
366    
367    3. system/Basis/Implementation/NJ/internals.{sig,sml} have been augmented
368       with a sub-structure BTrace for controlling back-tracing.  In particular,
369       the above-mentioned function "mode" controls whether the annotation
370       phase is invoked by the compiler.  Another important function is
371       "trigger": when called it aborts the current execution and causes
372       the top-level loop to print a full back-trace.
373    
374    4. compiler/MiscUtil/profile/btimp.sml is the current default plugin
375       for back-tracing.  It keeps track of the dynamic call stack and in
376       addition to that it keeps a partial history at each "level" of that
377       stack.  For example, if a tail-calls b, b tail-calls c, and c tail-calls
378       d and b (at separate times, dynamically), then the report will show:
379    
380       GOTO   d
381             /c
382       GOTO  \b
383       CALL   a
384    
385       This shows that there was an initial non-tail call of a, then a
386       tail-call to b or c, looping behavior in a cluster of functions that
387       consist of b and c, and then a goto from that cluster (i.e., either from
388       b or from c) to d.
389    
390       Note that (depending on the user program) the amount of information
391       that the back-trace module has to keep track of at each level is bounded
392       by a constant.  Thus, the whole implementation has the same asymptotical
393       complexity as the original program (both in space and in time).
394    
395    5. compiler/TopLevel/interact/evalloop.sml has been modified to
396       handle the special exception SMLofNJ.Internals.BTrace.BTrace
397       which is raised by the "trigger" function mentioned above.
398    
399    Notes on usage:
400    
401    - Annotated code works well together with unannotated code:
402    Unannotated calls simply do not show up at all in the backtrace.
403    
404    - It is not a good idea to let modules that were annotated during
405    different sessions run at the same time.  This is because the compiler
406    chooses small integers to identify individual functions, and there
407    will be clashes if different modules were compiled in separate sessions.
408    (Nothing will crash, and you will even be told about the clashes, but
409    back-trace information will in general not be useful.)
410    
411    - Back-tracing can be confused by callcc and capture.
412    
413    - The only way of getting a back-trace right now is to explicitly
414    invoke the "trigger" function from your user program.  Eventually, we
415    should make every exception carry back-trace information (if
416    available).  But since this creates more overhead at "raise"-time
417    (similar to the current exnHistory overhead), I have not yet
418    implemented this.  (The implementation will be rather easy.)  With
419    exceptions carrying back-trace information, this facility will be even
420    more useful because users don't need to modify their programs...
421    
422    - While it is possible to compile the compiler with back-trace
423    annotations turned on (I did it to get some confidence in
424    correctness), you must make absolutely sure that core.sml and
425    btimp.sml are compiled WITHOUT annotation!  (core.sml cannot actually
426    be compiled with annotation because there is no core access yet, but
427    if you compile btimp.sml with annotation, then the system will go into
428    an infinite recursion and crash.)
429    Since CM currently does not know about BTrace, the only way to turn
430    annotations on and off for different modules of the compiler is to
431    interrupt CMB.make, change the settings, and re-invoke it.  Of course,
432    this is awkward and clumsy.
433    
434    Sample sessions:
435    
436    Standard ML of New Jersey v110.28.1 [FLINT v1.5], June 5, 2000
437    - SMLofNJ.Internals.BTrace.mode (SOME true);
438    [autoloading]
439    [autoloading done]
440    val it = false : bool
441    - structure X = struct
442    -     fun main n = let
443    -         fun a (x, 0) = d x
444    -           | a (x, n) = b (x, n - 1)
445    -         and b (x, n) = c (x, n)
446    -         and c (x, n) = a (x, n)
447    -         and d x = e (x, 3)
448    -         and e (x, 0) = f x
449    -           | e (x, n) = e (x, n - 1)
450    -         and f 0 = SMLofNJ.Internals.BTrace.trigger ()
451    -           | f n = n * g (n - 1)
452    -         and g n = a (n, 3)
453    -     in
454    -         f n
455    -     end
456    - end;
457    structure X : sig val main : int -> int end
458    - X.main 3;
459    *** BACK-TRACE ***
460    GOTO   stdIn:4.2-13.20: X.main[2].f
461    GOTO-( stdIn:4.2-13.20: X.main[2].e
462    GOTO   stdIn:4.2-13.20: X.main[2].d
463         / stdIn:4.2-13.20: X.main[2].a
464         | stdIn:4.2-13.20: X.main[2].b
465    GOTO-\ stdIn:4.2-13.20: X.main[2].c
466    CALL   stdIn:4.2-13.20: X.main[2].g
467    GOTO   stdIn:4.2-13.20: X.main[2].f
468    GOTO-( stdIn:4.2-13.20: X.main[2].e
469    GOTO   stdIn:4.2-13.20: X.main[2].d
470         / stdIn:4.2-13.20: X.main[2].a
471         | stdIn:4.2-13.20: X.main[2].b
472    GOTO-\ stdIn:4.2-13.20: X.main[2].c
473    CALL   stdIn:4.2-13.20: X.main[2].g
474    GOTO   stdIn:4.2-13.20: X.main[2].f
475    GOTO-( stdIn:4.2-13.20: X.main[2].e
476    GOTO   stdIn:4.2-13.20: X.main[2].d
477         / stdIn:4.2-13.20: X.main[2].a
478         | stdIn:4.2-13.20: X.main[2].b
479    GOTO-\ stdIn:4.2-13.20: X.main[2].c
480    CALL   stdIn:4.2-13.20: X.main[2].g
481    GOTO   stdIn:4.2-13.20: X.main[2].f
482    CALL   stdIn:2.15-17.4: X.main[2]
483    -
484    
485    (Note that because of a FLINt bug the above code currently does not
486    compile without BTrace turned on.)
487    
488    Here is another example, using my modified Tiger compiler:
489    
490    Standard ML of New Jersey v110.28.1 [FLINT v1.5], June 5, 2000
491    - SMLofNJ.Internals.BTrace.mode (SOME true);
492    [autoloading]
493    [autoloading done]
494    val it = false : bool
495    - CM.make "sources.cm";
496    [autoloading]
497    ...
498    [autoloading done]
499    [scanning sources.cm]
500    [parsing (sources.cm):parse.sml]
501    [creating directory CM/SKEL ...]
502    [parsing (sources.cm):tiger.lex.sml]
503    ...
504    [wrote CM/sparc-unix/semant.sml]
505    [compiling (sources.cm):main.sml]
506    [wrote CM/sparc-unix/main.sml]
507    [New bindings added.]
508    val it = true : bool
509    - Main.compile ("../testcases/merge.tig", "foo.out");
510    *** BACK-TRACE ***
511    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trvar
512    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
513    CALL   lib/semant.sml:289.3-295.22: SemantFun[2].transExp.trexp.check[2]
514    GOTO   lib/semant.sml:289.3-295.22: SemantFun[2].transExp.trexp.check[2]
515    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
516    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
517    CALL   lib/semant.sml:488.3-505.6: SemantFun[2].transDec.trdec[2].transBody[2]
518         / lib/semant.sml:411.65-543.8: SemantFun[2].transDec
519    CALL-\ lib/semant.sml:413.2-540.9: SemantFun[2].transDec.trdec[2]
520    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
521    CALL   lib/semant.sml:8.52-558.4: SemantFun[2].transProg[2]
522    CALL   main.sml:1.18-118.4: Main.compile[2]
523    -
524    
525    ----------------------------------------------------------------------
526    Name: Matthias Blumen
527    Date: 2000/06/21 18:00:00 JST
528    Tag: blume-20000621-manual
529    Description:
530    
531    CM manual update: Path environments documented.
532    
533    ----------------------------------------------------------------------
534    Name: Matthias Blume
535    Date: 2000/06/19 13:40:00
536    Tag: blume-20000619-manual
537    Description:
538    
539    CM manual and system/README update.  This only covers the fact that
540    there are no more implicit anchors.  (Path environments and the "bind"
541    option to "cm" have yet to be documented.)
542    
543    ----------------------------------------------------------------------
544    Name: Matthias Blume
545    Date: 2000/06/19 11:05:00 JST
546    Tag: blume-20000619-chdir-bugfix
547    Description:
548    
549    Fixed a bug in new SrcPath module that sometimes led to a bad chDir call.
550    
551    ----------------------------------------------------------------------
552    Name: Matthias Blume
553    Date: 2000/06/18 22:00:10 JST
554    Tag: blume-20000618-implicit-anchors-really-gone
555    Description:
556    
557    I updates the previous HISTORY entry where I forgot to mention that
558    implicit anchors are no longer with us.
559    
560    The current update also gets rid of the (now useless) controller
561    CM.Control.implicit_anchors.
562    
563    ----------------------------------------------------------------------
564    Name: Matthias Blume
565    Date: 2000/06/16 17:30:00 JST
566    Tag: blume-20000616-anchorenv
567    Description:
568    
569    This patch implements the long anticipated (just kidding :) "anchor
570    environment" mechanism.  In the course of doing this, I also
571    re-implemented CM's internal "SrcPath" module from scratch.  The new
572    one should be more robust in certain boundary cases.  In any case, it
573    is a lot cleaner than its predecessor (IMHO).
574    
575    This time, although there is yet another boot file format change, I
576    kept the unpickler backward-compatible.  As a result, no new bootfiles
577    are necessary and bootstrapping is straightforward.  (You cannot read
578    new bootfiles into an old system, but the other way around is no
579    problem.)
580    
581    Visible changes:
582    
583    ** 0. Implicit path anchors (without the leading $-symbol) are no
584    longer recognized at all. This means that such path names are not
585    illegal either.  For example, the name basis.cm simply refers to a
586    local file called "basis.cm" (i.e, the name is an ordinary path
587    relative to .cm-files directory).  Or, to put it differently, only
588    names that start with $ are anchored paths.
589    
590    ** 1. The $<singlearc> abbreviation for $/<singlearc> has finally
591    vanished.
592    
593    John (Reppy) had critizised this as soon as I originally proposed and
594    implemented it, but at that time I did not really deeply believe
595    him. :) Now I came full-circle because I need the $<singlearc> syntax
596    in another place where it cannot be seen as an abbreviation for
597    $/<singlearc>.  To avoid the confusion, $<singlearc> now means what it
598    seems to mean (i.e., it "expands" into the corresponding anchor
599    value).
600    
601    However, when paths are used as members in CM description files, it
602    continues to be true that there must be at least another arc after the
603    anchor.  This is now enforced separately during semantic analysis
604    (i.e., from a lexical/syntactical point of view, the notation is ok.)
605    
606    ** 2. The "cm" class now accepts an option "bind".  The option's value
607    is a sub-option list of precisely two items -- one labeled "anchor"
608    and the other one labeled "value".  As you might expect, "anchor" is
609    used to specify an anchor name to be bound, and "value" specifies what
610    the anchor is being bound to.
611    
612    The value must be a directory name and can be given in either standard
613    syntax (including the possibility that it is itself an anchored path)
614    or native syntax.
615    
616    Examples:
617    
618       foo.cm (bind:(anchor:bar value:$mystuff/bar))
619       lib.cm (bind:(anchor:a value:"H:\\x\\y\\z"))  (* only works under windows *)
620    
621    and so on.
622    
623    The meaning of this is that the .cm-file will be processed with an
624    augmented anchor environment where the given anchor(s) is/are bound to
625    the given values(s).
626    
627    The rationale for having this feature is this: Suppose you are trying
628    to use two different (already stable) libraries a.cm and b.cm (that
629    you perhaps didn't write yourself).  Further, suppose each of these
630    two libraries internally uses its own auxiliary library $aux/lib.cm.
631    Normally you would now have a problem because the anchor "lib" can not
632    be bound to more than one value globally.  Therefore, the project that
633    uses both a.cm and b.cm must locally redirect the anchor to some other
634    place:
635    
636       a.cm (bind:(anchor:lib value:/usr/lib/smlnj/a-stuff))
637       b.cm (bind:(anchor:lib value:/usr/lib/smlnj/b-stuff))
638    
639    This hard-wires $lib/aux.cm to /usr/lib/smlnj/a-stuff/aux.cm or
640    /usr/lib/smlnj/b-stuff/aux.cm, respectively.
641    
642    Hard-wiring path names is a bit inflexible (and CM will verbosely warn
643    you when you do so at the time of CM.stabilize).  Therefore, you can
644    also use an anchored path as the value:
645    
646      a.cm (bind:(anchor:lib value:$a-lib))
647      b.cm (bind:(anchor:lib value:$b-lib))
648    
649    Now you can globally configure (using the usual CM.Anchor.anchor or
650    pathconfig machinery) bindings for "a-lib" and "b-lib".  Since "lib"
651    itself is always locally bound, setting it globally is no longer
652    meaningful or necessary (but it does not hurt either).  In fact, "lib"
653    can still be used as a global anchor for separate purposes.  As a
654    matter of fact, one can locally define "lib" in terms of a global
655    "lib":
656    
657      a.cm (bind:(anchor:lib value:$lib/a))
658      b.cm (bind:(anchor:lib value:$lib/b))
659    
660    ** 3: The encoding of path names has changed.  This affects the way
661    path names are shown in CM's progress report and also the internal
662    protocol encoding used for parallel make.
663    
664    The encoding now uses one or more ':'-separated segments.  Each
665    segments corresponds to a file that has been specified relative to the
666    file given by its preceding segment.  The first segment is either
667    relative to the CWD, absolute, or anchored.  Each segment itself is
668    basically a Unix pathname; all segments but the first are relative.
669    
670    Example:
671    
672       $foo/bar/baz.cm:a/b/c.sml
673    
674    This path denotes the file bar/a/b/c.sml relative to the directory
675    denoted by anchor "foo".  Notice that the encoding also includes
676    baz.cm which is the .cm-file that listed a/b/c.sml.  As usual, such
677    paths are resolved relative to the .cm-files directory, so baz.cm must
678    be ignored to get the "real" pathname.
679    
680    To make this fact more obvious, CM puts the names of such "virtual
681    arcs" into parentheses when they appear in progress reports. (No
682    parentheses will appear in the internal protocol encoding.)  Thus,
683    what you really see is:
684    
685      $foo/bar/(baz.cm):a/b/c.sml
686    
687    I find this notation to be much more informative than before.
688    
689    Another new feature of the encoding is that special characters
690    including parentheses, colons, (back)slashes, and white space are
691    written as \ddd (where ddd is the decimal encoding of the character).
692    
693    *** The CM manual still needs to be updated.
694    
695    ----------------------------------------------------------------------
696    Name: Allen Leung
697    Date: 2000/06/15 00:38:00
698    Tag: leunga-20000615-x86-peephole
699    
700    x86 Peephole fix by Fermin.  Affects c-- and moby only.
701    
702    ----------------------------------------------------------------------
703    Name: Matthias Blume
704    Date: 2000/06/12 11:40:00
705    Tag: blume-20000612-parmakefix
706    Description:
707    
708    More cleanup after changing the file naming scheme: This time I
709    repaired the parallel make mechanism for CMB.make which I broke earlier.
710    
711    ----------------------------------------------------------------------
712    Name: Allen Leung
713    Date: 2000/06/09 01:25:00
714    Tag: leunga-20000609-various
715    
716    None of these things should affect normal SML/NJ operations
717    
718    1. Peephole improvements provided by Fermin (c--)
719    2. New annotation DEFUSE for adding extra dependence (moby)
720    3. New X86 LOCK instructions (moby)
721    4. New machine description language for reservation tables (scheduling)
722    5. Fixes to various optimization/analysis modules (branch chaining, dominator
723       trees etc.)
724    6. I've changed the CM files so that they can work with versions
725       110.0.6, 110.25 and 110.28
726    
727    ----------------------------------------------------------------------
728    Name: Matthias Blume
729    Date: 2000/06/09 12:40:00
730    Tag: blume-20000609-log
731    Description:
732    
733    - Removed all(?) remaining RCS Log entries from sources.
734    
735    - Fixed bug in ml-yacc and ml-lex sources (use explicit anchors for
736      anchored paths).
737    
738    ----------------------------------------------------------------------
739    Name: Matthias Blume
740    Date: 2000/06/07 17:00:00 JST
741    Tag: blume-20000607-no-implicit-anchors
742    Description:
743    
744    1. This update changes the default setting for
745    CM.Control.implicit_anchors from true to false.  This means that
746    implicit anchors are no longer permitted by default.  I also tried to
747    make sure that nothing else still relies on implicit anchors.
748    (This is the next step on the schedule towards a CM that does not even
749    have the notion of implicit anchors anymore.)
750    
751    2. More CM manual updates.
752    
753    3. I managed to track down and fix the pickling bug I mentioned last
754    time.  Because of the previously existing workaround, this entails no
755    immediate practical changes.
756    
757    ----------------------------------------------------------------------
758    Name: Matthias Blume
759    Date: 2000/06/06 11:15:00 JST
760    Tag: blume-20000606-lazierpickle
761    Description:
762    
763    !!!! NEW BOOT FILES !!!!
764    
765    * The main purpose of this update is to make library pickles lazier in
766    order to reduce the initial space penalty for autoloading a library.
767    As a result, it is now possible to have $smlnj/compiler.cm
768    pre-registered.  This should take care of the many complaints or
769    inquiries about missing structure Compiler.  This required changes to
770    CM's internal data structures and small tweaks to some algorithms.
771    
772    As a neat additional effect, it is no longer necessary (for the sake
773    of lean heap image files) to distinguish between a "minimal" CM and a
774    "full" CM.  Now, there is only one CM (i.e., the "full" version:
775    $smlnj/cm.cm aka $smlnj/cm/full.cm), and it is always available at the
776    interactive top level. ($smlnj/cm/minimal.cm is gone.)
777    
778    To make the life of compiler-hackers easier, "makeml" now also
779    pre-registers $smlnj/cmb.cm (aka $smlnj/cmb/current.cm).  In other
780    words, after you bootstrap a new sml for the first time, you will not
781    have to autoload $smlnj/cmb.cm again afterwards.  (The first time
782    around you will still have to do it, though.)
783    
784    * A second change consists of major updates to the CM manual.  There
785    are now several appendices with summary information and also a full
786    specification of the CM description file syntax.
787    
788    * In directory src/system I added the script "allcross".  This script
789    invokes sml and cross-compiles the compiler for all supported
790    architectures.  (Useful when providing a new set of boot files.)
791    
792    * There seems to be a latent bug in my "lazy pickles" mechanism.  I
793    added a small tweak to pickle-util.sml to work around this problem,
794    but it is not a proper fix yet.  I will investigate further.  (The
795    effect of the bug was an inflation of library pickle size.)
796    
797    * Version number increased to 110.28.1 (to avoid compatibility problems).
798    
799    ----------------------------------------------------------------------
800    Name: Allen Leung
801    Date: 2000/05/25 17:28 EDT
802    Tag: leunga-20000525-ra
803    Description:
804    
805      Fixed a bug in freezing phase of the register allocator.
806    
807    ----------------------------------------------------------------------
808    Name: Allen Leung
809    Date: 2000/05/15 22:53 EDT
810    Tag: leunga-20000515-alpha-x86-ra
811    Description:
812    
813      1. Alpha
814    
815          Slight cleanup.  Removed the instruction SGNXL
816    
817      2. X86
818    
819          Added the following instructions to the instruction set:
820    
821            ROLx, RORx,
822            BTx, BTSx, BTLx, BTRx,
823            XCHGx, and variants with the LOCK prefix
824    
825      3. Register Allocation
826    
827          The module ra-rewrite-with-renaming has been improved.
828    
829      These have no effect on SML/NJ.
830    
831    ----------------------------------------------------------------------
832    Name: Matthias Blume
833    Date: 2000/05/15 16:20:00 JST
834    Tag: blume-20000515-lightrebuild
835    Description:
836    
837    1. I added an alternative to "-rebuild" to "makeml".  The difference is
838       that prior to calling CMB.make' the CM-variable "LIGHT" will be
839       defined.  In effect, the command will not build any cross-compiler
840       backends and therefore finish more quickly.
841    
842       The "fixpt" script also takes a "-light" switch to be able to use
843       this new facility while compiling for a fixpoint.
844    
845    2. I replaced all mentions of anchored paths in group owner specifications
846       with simple relative paths (usually starting with "..").
847       The rationale is that a library's internal workings should not be
848       compromised by the lack of some anchor.  (An anchor is necessary
849       for someone who wants to refer to the library by an anchored path,
850       but it should not be necessary to build the same library in the first
851       place.)
852    
853    3. I changed the way CM's tool mechanism determines the shell command
854       string used for things like ml-yacc etc. so that it does not break
855       when CM.Control.implicit_anchors is turned off.
856    
857    ----------------------------------------------------------------------
858    Name: Matthias Blume
859    Date: 2000/05/12 18:20:00 JST
860    Tag: blume-20000512-ml-build
861    Description:
862    
863    Fixed a bug in config/_ml-build that prevented ml-yacc and ml-lex from
864    getting installed properly (by config/install.sh).
865    
866    ----------------------------------------------------------------------
867    Name: Matthias Blume
868    Date: 2000/05/12 17:30:00 JST
869    Tag: blume-20000512-anchors
870    Description:
871    
872    !!! NEW BOOT FILES !!!
873    
874    This change is in preparation of fading out support for "implicitly
875    anchored path names".  I went through all sources and used the
876    explicit (and relatively new) $-notation.  See system/README and the
877    CM manual for more info on this.
878    
879    I also modified the anchoring scheme for some things such as "smlnj",
880    "MLRISC", "cm", etc. to take advantage of the fact that explicit
881    anchors are more expressive: anchor name and first arc do not have to
882    coincide.  This entails the following user-visible change:
883    
884    You have to write $smlnj/foo/bar instead of smlnj/foo/bar.  In
885    particular, when you fire up sml with a command-line argument, say,
886    e.g.:
887    
888       sml '$smlnj/cmb.cm'
889    
890    At the ML toplevel prompt:
891    
892       CM.autoload "$smlnj/cmb.cm";
893    
894    There is also a new controller in CM.Control that can be used to turn
895    off all remaining support for implicit anchors by saying:
896    
897        CM.autoload "$smlnj/
898        #set CM.Control.implicit_anchors false;
899    
900    This causes CM to reject implicitly anchored paths.  This is (for the
901    time being) less permissive than the "final" version where there will
902    be no more such implicit anchors and relative paths will be just that:
903    relative.
904    
905    The next step (version after next version?) will be to make the
906    default for CM.Control.implicit_anchors false.  After the dust has
907    settled, I can then produce the "final" version of this...
908    
909    Note: Since bootstrapping is a bit tricky, I provided new boot files.
910    
911    ----------------------------------------------------------------------
912    Name: Matthias Blume
913    Date: 2000/05/11 16:30:00 JST
914    Tag: blume-20000511-sources
915    Description:
916    
917    The main change is that I added function CM.sources as a generalized
918    version of the earlier CM.makedepend.  This entails the following
919    additional changes:
920    
921      - CM.makedepend has been dropped.
922    
923      - CM manual has been updated.
924    
925      - TOOLS signature and API have been changed.
926    
927    ----------------------------------------------------------------------
928    Name: Allen Leung
929    Date: 2000/05/10 21:17 EDT
930    Tag: leunga-20000510-moby-c--ssa
931    Description:
932    
933      Various bug fixes and new features for C--, Moby and MLRISC optimizations.
934    None of these affect SML/NJ.
935    
936    1. Register Allocation
937    
938        a. A new ra spilling module (ra/ra-spill-with-renaming) is implemented.
939           This module tries to remove local (i.e. basic block level) redundancies
940           during spilling.
941    
942        b. A new framework for performing region based register allocation.
943           Not yet entirely functional.
944    
945    2. X86
946    
947       a. DefUse for POP was missing the stack pointer [found by Lal]
948       b. Reload for CALL was incorrect in X86Spill [found by John]
949       c. Various fixes in X86Spill so that it can be used correctly for
950          the new spilling module.
951    
952    3. SSA/IR
953    
954       a. New module ir/dj-dataflow.sml implements elimination based
955          data flow analysis.
956    
957    4. MLRiscGen
958    
959       a. Fix for gc type annotation
960    
961    5. MDGen
962    
963       Various fixes for machine description -> ml code translation.  For ssa
964       only.
965    
966    ----------------------------------------------------------------------
967    Name: Allen Leung
968    Date: 2000/05/08 22:17 EDT
969    Tag: leunga-20000508-labexp
970    Description:
971    
972      Fermin has found a few assembly problems with constant expressions
973      generated in LabelExp.  Mostly, the problems involve extra parentheses,
974      which choke on dumb assemblers.  This is his fix.
975    
976    ----------------------------------------------------------------------
977    Name: Dave MacQueen
978    Date: 2000/04/09 14:00 EDT
979    Tag: dbm-20000502-Version_110_28
980    Description:
981    
982    1. Updated src/compiler/TopLevel/main/version.sml to version 110.28
983    
984    2. Updated config/version to 110.28
985    
986    3. Updated config/srcarchiveurl
987    
988    3. New boot files!
989       ftp://ftp.research.bell-labs.com/dist/smlnj/working/110.28/
990    
991    ----------------------------------------------------------------------
992    Name: Matthias Blume
993    Date: 2000/05/01 19:05:00 JST
994    Tag: blume-20000501-noweb
995    Description:
996    
997    A new noweb tool has been added.  The existing system is entirely
998    unaffected by this, but some CM users have asked for renewed noweb
999    support.  Everything is documented in the CM manual.
1000    
1001    New (plugin) libraries:
1002    
1003       noweb-tool.cm
1004       nw-ext.cm
1005    
1006    ----------------------------------------------------------------------
1007    Name: Dave MacQueen
1008    Date: 2000/04/30 12:40PM EDT
1009    Tag: dbm-20000430-bug_fixes
1010    Description:
1011    
1012    1. Fix for bug 1498
1013       smlnj/src/system/Basis/Implementation/Unsafe/object.sig
1014       smlnj/src/system/Basis/Implementation/Unsafe/object.sml
1015         added toRealArray function
1016       smlnj/src/compiler/MiscUtil/print/ppobj.sml
1017         added check for tag Obj.RealArray to array printing case in ppObj
1018    
1019    2. Fix for bug 1510
1020       smlnj/src/compiler/Semant/types/typesutil.sml
1021         fixed definition of dummyargs (used by equalTycon) so that
1022         dummy args are distinct types
1023    
1024    ----------------------------------------------------------------------
1025    Name: Matthias Blume
1026    Date: 2000/04/30 01:00:00 JST
1027    Tag: blume-20000430-versions
1028    Description:
1029    
1030    1. CM version numbering added.  This is an implementation of Lal's
1031       proposal for adding version numbers and version checking to .cm
1032       files.  Lal said that his proposal was just that -- a proposal.
1033       For the time being I went ahead and implemented it so that people
1034       can comment on it.  Everything is completely backward-compatible
1035       (except for the stable library format, i.e., new bootfiles!).
1036    
1037       As usual, see the CM manual for details.
1038    
1039    2. An alternative syntax for anchored paths has been implemented.
1040       Dave has recently voiced the same concerns that I had when I did
1041       this, so there should be some support.  My take is that eventually
1042       I will let support for the current syntax (where anchors are
1043       "implicit") fade out in favor of the new, explicit syntax.
1044       In order to be backward-compatible, both old and new syntax are
1045       currently supported.
1046    
1047       Again, see the CM manual for details.
1048    
1049    3. Parallel make is trying to be slightly smarter:  When the master
1050       process finds a "bottleneck", i.e., when there is only one
1051       compilation unit that can be compiled and everybody else is
1052       waiting on it, then it will simply compile it directly instead
1053       of clumsily telling one of the slaves to do it.
1054    
1055    4. Support for "unsharing" added.  This is necessary in order to be
1056       able to have two different versions of the same library running
1057       at the same time (e.g., for trying out a new MLRISC while still
1058       having the old MLRISC linked into the current compiler, etc.)
1059       See the CM manual.
1060    
1061    5. Simple "makedepend" functionality added for generating Makefile
1062       dependency information.  (This is rather crude at the moment.
1063       Expect some changes here in the future.)
1064    
1065    6. ".fun" added as a recognized suffix for ML files. Also documented
1066       explicitly in the manual that the fallback behavior (unknown suffix
1067       -> ML file) is not an official feature!
1068    
1069    7. Small changes to the pickler for stable libraries.
1070    
1071    8. Several internal changes to CM (for cleanup/improvement).
1072    
1073    
1074    !!!! NEW BINFILES !!!!
1075    
1076    ----------------------------------------------------------------------
1077    Name: Matthias Blume
1078    Date: 2000/04/28 17:30:00 JST
1079    Tag: blume-20000428-pathconfig
1080    Description:
1081    
1082    1. I changed config/install.sh to remove duplicate entries from the
1083       lib/pathconfig file at the end.  Moreover, the final version of
1084       lib/pathconfig is sorted alphabetically.  The same (sorting) is done
1085       in src/system/installml.
1086    
1087    2. The config/install.sh script now consistently uses relative
1088       pathnames in lib/pathconfig whenever the anchor is in the lib
1089       directory.  (So far this was true for the libraries that come
1090       pre-compiled and bundled as part of the bootfiles but not for
1091       libraries that are compiled by the script itself.)
1092    
1093    ----------------------------------------------------------------------
1094    Name: Matthias Blume
1095    Date: 2000/04/26 13:10:00 JST
1096    Tag: blume-20000426-fun_suffix
1097    Description:
1098    
1099    Added ".fun" as a recognized file name suffix (for ML code).
1100    
1101    ----------------------------------------------------------------------
1102    Name: Allen Leung
1103    Date: 2000/04/25 17:00:00 EST
1104    Tag: leunga-20000425-alpha-ra
1105    Description:
1106    
1107    1. Alpha
1108    
1109        PSEUDOARITH was missing in AlphaRewrite.  This causes an endless loop
1110    in C--.
1111    
1112    2. RA
1113    
1114       Added a flag "ra-dump-size" to print out the size of the flowgraph
1115       and the interference graph.
1116    
1117    ----------------------------------------------------------------------
1118  Name: Dave MacQueen  Name: Dave MacQueen
1119  Date: 2000/04/25/  Date: 2000/04/25/
1120  Tag: dbm-20000425-mlyacc_doc_examples  Tag: dbm-20000425-mlyacc_doc_examples
# Line 36  Line 1139 
1139    
1140              s <- t              s <- t
1141    
1142        no interference edge between s and t are added for this definition of s.        no interference edge between s and t is added for this definition of s.
1143    
1144     b. I've added two new spill heuristic modules that Fermin and I developed     b. I've added two new spill heuristic modules that Fermin and I developed
1145        (in the new library RA.cm). These are unused in SML/NJ but maybe        (in the new library RA.cm). These are unused in SML/NJ but maybe
# Line 184  Line 1287 
1287    
1288  3.  Assembly  3.  Assembly
1289    
1290      When generating assemby, resolve the value of client defined constants,      When generating assembly, resolve the value of client defined constants,
1291      instead of generating symbolic values.  This is controlled by the      instead of generating symbolic values.  This is controlled by the
1292      new flag "asm-resolve-constants", which is default to true.      new flag "asm-resolve-constants", which is default to true.
1293    
# Line 207  Line 1310 
1310    
1311  To this end, I arranged that instead of "structure Core" as "structure  To this end, I arranged that instead of "structure Core" as "structure
1312  _Core" is bound in the pervasive environment.  Core access is done via  _Core" is bound in the pervasive environment.  Core access is done via
1313  _Core (which can never be accidentially rebound because _Core is not a  _Core (which can never be accidentally rebound because _Core is not a
1314  legal surface-syntax symbol).  legal surface-syntax symbol).
1315    
1316  The current solution is much cleaner because the core environment is  The current solution is much cleaner because the core environment is
# Line 217  Line 1320 
1320  with dynamic and symbolic parts of the core environment.  with dynamic and symbolic parts of the core environment.
1321    
1322  Remaining hackery (to bind the "magic" symbol _Core) is localized in the  Remaining hackery (to bind the "magic" symbol _Core) is localized in the
1323  compilation mananger's bootstrap compiler (actually: in the "init group"  compilation manager's bootstrap compiler (actually: in the "init group"
1324  handling).  See the comments in src/system/smlnj/init/init.cmi for  handling).  See the comments in src/system/smlnj/init/init.cmi for
1325  more details.  more details.
1326    
# Line 332  Line 1435 
1435     (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
1436     used).     used).
1437    
1438     This was done to accomodate the new "make" and "shell" tools which     This was done to accommodate the new "make" and "shell" tools which
1439     facilitate fairly seemless hookup to portions of code managed using     facilitate fairly seamless hookup to portions of code managed using
1440     Makefiles or Shell scripts.     Makefiles or Shell scripts.
1441    
1442     There are no classes "shared" or "private" anymore.  Instead, the     There are no classes "shared" or "private" anymore.  Instead, the
# Line 345  Line 1448 
1448    
1449     All existing tools are described in the CM manual.     All existing tools are described in the CM manual.
1450    
1451     - Slightly better error handling.  (CM now surpresses many followup     - Slightly better error handling.  (CM now suppresses many followup
1452     error messages that tended to be more annoying than helpful.)     error messages that tended to be more annoying than helpful.)
1453    
1454  2. Major changes to the compiler's static environment data structures.  2. Major changes to the compiler's static environment data structures.
# Line 479  Line 1582 
1582    
1583       I've changed andl to testl in the floating point test sequence       I've changed andl to testl in the floating point test sequence
1584       whenever appropriate.  The Intel optimization guide states that       whenever appropriate.  The Intel optimization guide states that
1585       testl is perferable to andl.       testl is preferable to andl.
1586    
1587  7. RA (x86 only)  7. RA (x86 only)
1588    
# Line 661  Line 1764 
1764    
1765  1. Tools.registerStdShellCmdTool (from smlnj/cm/tool.cm) takes an  1. Tools.registerStdShellCmdTool (from smlnj/cm/tool.cm) takes an
1766  additional argument called "template" which is an optional string that  additional argument called "template" which is an optional string that
1767  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
1768  explanation.  explanation.
1769    
1770  2. A special-purpose tool can be "regisitered" by simply dropping the  2. A special-purpose tool can be "registered" by simply dropping the
1771  corresponding <...>-tool.cm (and/or <...>-ext.cm) into the same  corresponding <...>-tool.cm (and/or <...>-ext.cm) into the same
1772  directory where the .cm file lives that uses this tool.  (The  directory where the .cm file lives that uses this tool.  (The
1773  behavior/misfeature until now was to look for the tool description  behavior/misfeature until now was to look for the tool description
# Line 708  Line 1811 
1811  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
1812  <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,
1813  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
1814  perhaps got accidentially killed).  In this case, fixpt will quickly  perhaps got accidentally killed).  In this case, fixpt will quickly
1815  move through what exists before continuing where it left off earlier,  move through what exists before continuing where it left off earlier,
1816  and, thus, saves a lot of time.  and, thus, saves a lot of time.
1817    
# Line 758  Line 1861 
1861    it from that remote directory.    it from that remote directory.
1862    This should simplify installation further:  For machines that have    This should simplify installation further:  For machines that have
1863    access to the internet, just fetch <version>-config.tgz, unpack it,    access to the internet, just fetch <version>-config.tgz, unpack it,
1864    edit config/targets, and go (run config/install.sh).  The scipt will    edit config/targets, and go (run config/install.sh).  The script will
1865    fetch everything else that it might need all by itself.    fetch everything else that it might need all by itself.
1866    
1867    For CVS users, this mechanism is not relevant for source archives, but    For CVS users, this mechanism is not relevant for source archives, but

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