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Diff of /sml/trunk/HISTORY

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revision 666, Fri Jun 16 08:27:00 2000 UTC revision 701, Thu Aug 31 08:46:43 2000 UTC
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13  Description:  Description:
14  ----------------------------------------------------------------------  ----------------------------------------------------------------------
15  Name: Matthias Blume  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  Date: 2000/06/16 17:30:00 JST
566  Tag: blume-20000616-anchorenv  Tag: blume-20000616-anchorenv
567  Description:  Description:
# Line 31  Line 580 
580    
581  Visible changes:  Visible changes:
582    
583  ** 1. The $<singlearc> abbreviation for $/<singlearc> for anchored  ** 0. Implicit path anchors (without the leading $-symbol) are no
584  paths has finally vanished.  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  John had critizised this as soon as I originally proposed and  ** 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  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  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  in another place where it cannot be seen as an abbreviation for
# Line 45  Line 601 
601  However, when paths are used as members in CM description files, it  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  continues to be true that there must be at least another arc after the
603  anchor.  This is now enforced separately during semantic analysis  anchor.  This is now enforced separately during semantic analysis
604  (i.e., form a lexical/syntactical point of view, the notation is ok.)  (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  ** 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"  is a sub-option list of precisely two items -- one labeled "anchor"
# Line 134  Line 690 
690  including parentheses, colons, (back)slashes, and white space are  including parentheses, colons, (back)slashes, and white space are
691  written as \ddd (where ddd is the decimal encoding of the character).  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  Name: Allen Leung
697  Date: 2000/06/15 00:38:00  Date: 2000/06/15 00:38:00

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