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revision 660, Thu Jun 15 04:40:56 2000 UTC revision 734, Sun Nov 19 05:27:41 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: Matthias Blume
17    Date: 2000/11/19 14:30:00 JST
18    Tag:  blume-20001119-autoload
19    Description:
20    
21    Some hacking to make autoloading faster.  Success for CMB, no success
22    so far for CM.  There is a reduced structure CM' that autoloads faster.
23    (This is a temporary, non-documented hack to be eliminated again when
24    the general problem is solved.)
25    
26    ----------------------------------------------------------------------
27    Name: Matthias Blume
28    Date: 2000/11/17 14:10:00 JST
29    Tag: blume-20001117-pickle-lib
30    Description:
31    
32    1. Eliminated comp-lib.cm
33    2. Made pickle-lib.cm
34    3. Eliminated all uses of intset.sml (from comp-lib.cm)
35    4. Replaced all uses of intmap.{sig,sml} (from comp-lib.cm) with
36       equivalent constructs from smlnj-lib.cm (INtHashTable).
37    5. Point 4. also goes for those uses of intmap.* in MLRISC.
38       Duplicated intmap modules thrown out.
39    6. Hunted down all duplicated SCC code and replaced it with
40       equivalent stuff (GraphSCCFn from smlnj-lib.cm).
41    7. Rewrote Feedback module.
42    8. Moved sortedlist.sml into viscomp-lib.cm.  Eventually it
43       should be thrown out and equivalent modules from smlnj-lib.cm
44       should be used (IntRedBlackSet, IntListSet, ...).
45    
46    Confirmed that compiler compiles to fixpoint.
47    
48    ----------------------------------------------------------------------
49    Name: Allen Leung
50    Date: 2000/11/10 18:00:00
51    Tag: leunga-20001110-new-x86-fp
52    
53    A new x86 floating point code generator has been added.
54    By default this is turned off.  To turn this on, do:
55    
56        CM.autoload "$smlnj/compiler.cm";
57        Compiler.Control.MLRISC.getFlag "x86-fast-fp" := true;
58    
59    Changes:
60    
61    1.  Changed FTAN to FPTAN so that the assembly output is correct.
62    2.  Changed the extension callback for FTANGENT to generate:
63    
64              fptan
65              fstp  %st(0)
66        instead of
67              fptan
68              fstpl ftempmem
69    
70    3.  Numerous assembly fixes for x86.
71    
72    5.  Cleaned up the machine code output module x86/x86MC.sml and added
73        support for a whole bunch of instructions and addressing modes:
74    
75          fadd/fsub/fsubr/fmul/fdiv/fdivr  %st, %st(n)
76          faddp/fsubp/fsubrp/fmulp/fdivp/fdivrp  %st, %st(n)
77          fadd/fsub/fsubr/fmul/fdiv/fdivr  %st(n), %st
78          fiadd/fisub/fisubr/fimul/fidiv/fidivr mem
79          fxch %st(n)
80          fld %st(n)
81          fst %st(n)
82          fst mem
83          fstp %st(n)
84          fucom %st(n)
85          fucomp %st(n)
86    
87        All these are now generated when the fast fp mode is turned on.
88    
89    6.  Removed the dedicated registers %st(0), ..., %st(7) from X86CpsRegs
90    
91    ----------------------------------------------------------------------
92    Name: Matthias Blume
93    Date: 2000/11/09 11:20:00 JST
94    Tag: blume-20001109-scc
95    Description:
96    
97    Eliminated some code duplication:
98    
99    1. Added "where" clause to GraphSCCFn in SML/NJ Library.
100       (Otherwise the functor is useless.)
101    2. Used GraphSCCFn where SCCUtilFun was used previously.
102    3. Got rid of SCCUtilFun (in comp-lib.cm).
103    
104    ----------------------------------------------------------------------
105    Name: Lal George
106    Date: 2000/11/06 09:02:21 EST 2000
107    Tag: Release_110_30
108    Description:
109    
110    - Version 110.30
111    ----------------------------------------------------------------------
112    Name: Matthias Blume
113    Date: 2000/11/04 14:45:00
114    Tag: blume-20001104-mlbuild
115    Description:
116    
117    - Made ml-build faster on startup.
118    - Documentation fixes.
119    
120    ----------------------------------------------------------------------
121    Name: Matthias Blume
122    Date: 2000/11/02 17:00:00 JST
123    Tag: blume-20001102-condcomp
124    Description:
125    
126    - Small tweaks to pickler -- new BOOTFILES!
127    - Version bumped to 110.29.2.
128    - Added conditional compilation facility to init.cmi (see comment there).
129    ----------------------------------------------------------------------
130    Name: Allen Leung
131    Date: 2000/10/23 19:31:00
132    Tag: leunga-20001023-demo-ra
133    
134    1. Minor RA changes that improves spilling on x86 (affects Moby and C-- only)
135    2. Test programs for the graph library updated
136    3. Some new MLRISC demo programs added
137    
138    ----------------------------------------------------------------------
139    Name: Matthias Blume
140    Date: 2000/08/31 22:15:00 JST
141    Tag: blume-20001017-errmsg
142    Description:
143    
144    More error message grief: Where there used to be no messages, there
145    now were some that had bogus error regions.  Fixed.
146    
147    ----------------------------------------------------------------------
148    Name: Matthias Blume
149    Date: 2000/08/31 17:30:00 JST
150    Tag: blume-20001017-v110p29p1
151    Description:
152    
153    I made a version 110.29.1 with new bootfiles.
154    
155    Changes:  Modified pickler/unpickler for faster and leaner unpickling.
156              CM documentation changes and a small bugfix in CM's error reporting.
157    
158    ----------------------------------------------------------------------
159    Name: Lal George
160    Date: 2000/09/27 14:42:35 EDT
161    Tag: george-20000927-nodestatus
162    Description:
163    
164    Changed the type of the nodestatus, so that:
165    
166            SPILLED(~1)             is now SPILLED
167            SPILLED(m) where m>=0   is now MEMREG(m)
168            SPILLED(s) where s<~1   is now SPILL_LOC(~s)
169    
170    ----------------------------------------------------------------------
171    Name: Matthias Blume
172    Date: 2000/09/07 14:45:00 JST
173    Tag: blume-20000907-cmerrmsg
174    Description:
175    
176    Small tweak to CM to avoid getting ML syntax error messages twice.
177    
178    ----------------------------------------------------------------------
179    Name: Matthias Blume
180    Date: 2000/08/31 18:00:00 JST
181    Tag: blume-20000831-cvsbootfiles
182    Description:
183    
184    New URL for boot files (because the 110.29 files on the BL server do
185    now work correctly with my updated install scripts for yacc and lex).
186    
187    ----------------------------------------------------------------------
188    Name: Matthias Blume
189    Date: 2000/08/08 12:33:00 JST
190    Tag: blume-20000808-manual
191    Description:
192    
193    Tiny update to CM manual.
194    
195    ----------------------------------------------------------------------
196    Name: Allen Leung
197    Date: 2000/08/7 19:31:00
198    Tag: leunga-20000807-a-whole-bunch-of-stuff
199    
200      Moby, C--, SSA, x86, machine descriptions etc.  Should only affect C--
201    and Mobdy.
202    
203    1.  x86
204    
205       a.  Fixes to peephole module by John and Dan.
206       b.  Assembly fix to SETcc by Allen.
207       c.  Fix to c-call by John.
208       d.  Fix to spilling by John.  (This one deals with the missing FSTPT case)
209       e.  Instruction selection optimization to SETcc as suggested by John.
210    
211           For example,
212    
213            MV(32, x, COND(32, CMP(32, LT, a, b), LI 1, LI 0))
214    
215           should generate:
216    
217            MOVL a, x
218            SUBL b, x
219            SHRL 31, x
220    
221    2.  IR stuff
222    
223         A bunch of new DJ-graph related algorithms added.  These
224         speed up SSA construction.
225    
226    3.  SSA + Scheduling
227    
228         Added code for SSA and scheduling to the repository
229    
230    ----------------------------------------------------------------------
231    Name: Lal George
232    Date: 2000/07/27 11:53:14 EDT
233    
234    Tag: lal-20000727-linux-ppc
235    Description:
236    
237     Made changes to support Linux PPC.
238     p.s. I have confirmation that the 110.29 boot files work fine.
239    
240    ----------------------------------------------------------------------
241    Name: Matthias Blume
242    Date: 2000/07/27 17:40:00 JST
243    Tag: blume-20000727-scripts
244    Description:
245    
246    !!!! WARNING !!!!
247    You must recompile the runtime system!
248    !!!! WARNING !!!!
249    
250    This is basically another round of script-enhancements:
251    
252    1. sml, ml-build, and ml-makedepend accept options -D and -U to define
253       and undefine CM preprocessor symbols.
254    
255    2. ml-build avoids generating a new heap image if it finds that the
256       existing one is still ok.  (The condition is that no ML file had to
257       be recompiled and all ML files are found to be older that the heap
258       file.)
259    
260       To make this work smoothly, I also hacked the runtime system as
261       well as SMLofNJ.SysInfo to get access to the heap image suffix
262       (.sparc-solaris, ...) that is currently being used.
263    
264       Moreover, the signature of CM.mk_standalone has changed.  See the
265       CM manual.
266    
267    3. ml-makedepend accepts additional options -n, -a, and -o.  (See the
268       CM manual for details.)
269    
270    4. More CM manual updates:
271        - all of the above has been documented.
272        - there is now a section describing the (CM-related) command line
273          arguments that are accepted by the "sml" command
274    
275    ----------------------------------------------------------------------
276    Name: Matthias Blume
277    Date: 2000/07/25 16:20:00 JST
278    Tag: blume-20000725-makedepend
279    Description:
280    
281    Added a script called ml-makedepend.  This can be used in makefiles
282    for Unix' make in a way very similar to the "makedepend" command for
283    C.
284    
285    The script internally uses function CM.sources.
286    
287    Synopsis:
288    
289        ml-makedepend [-f makefile] cmfile targetname
290    
291    The default for the makefile is "makefile" (or "Makefile" should
292    "makefile" not exist).
293    
294    ml-makedepend adds a cmfile/targetname-specific section to this
295    makefile (after removing the previous version of this section).  The
296    section contains a single dependency specification with targetname on
297    the LHS (targetname is an arbitrary name), and a list of files derived
298    from the cmfile on the RHS.  Some of the files on the RHS are
299    ARCH/OPSYS-specific.  Therefore, ml-makedepend inserts references to
300    "make" variables $(ARCH) and $(OPSYS) in place of the corresponding
301    path names.  The makefile writer is responsible for making sure that
302    these variables have correct at the time "make" is invoked.
303    
304    ----------------------------------------------------------------------
305    Name: Matthias Blume
306    Date: 2000/07/22 23:30:00 JST
307    Tag: blume-20000722-urlupdate
308    Description:
309    
310    Changed BOOT and config/srcarchiveurl to point to BL server:
311    
312        ftp://ftp.research.bell-labs.com/dist/smlnj/working/110.29/
313    
314    ----------------------------------------------------------------------
315    Name: Matthias Blume
316    Date: 2000/07/18 18:00:00 JST
317    Tag: blume-20000718-Version_110_29
318    Description:
319    
320    1. Updated src/compiler/TopLevel/main/version.sml to version 110.29
321    
322    2. Updated config/version to 110.29
323    
324    3. Updated config/srcarchiveurl
325    
326    3. New boot files!
327       ftp://ftp.cs.princeton.edu/pub/people/blume/sml/110.29-autofetch
328    
329    ----------------------------------------------------------------------
330    Name: Matthias Blume
331    Date: 2000/07/11 13:58:00 JST
332    Tag: blume-20000711-doctypo
333    Description:
334    
335    Fixed a few typos in CM manual.
336    
337    ----------------------------------------------------------------------
338    Name: Allen Leung
339    Date: 2000/06/15 00:38:00
340    Tag: leunga-20000704-sparc-x86
341    
342    1. x86 peephole improvement sp += k; sp -= k => nop  [from John]
343    2. fix to x86 RET bug [found by Dan Grossman]
344    3. sparc assembly bug fix for ticc instructions [found by Fermin]
345    
346       Affects c-- and moby only
347    
348    ----------------------------------------------------------------------
349    Name: Matthias Blume
350    Date: 2000/07/04 15:26:00
351    Tag: blume-20000704-trigger
352    Description:
353    
354    1. Improvements to CM manual.
355    2. SMLofNJ.Internals.BTrace.trigger reinstated as an alternative way
356       of getting a back-trace.  The function, when called, raises an
357       internal exception which explicitly carries the full back-trace history,
358       so it is unaffected by any intervening handle-raise pairs ("trivial"
359       or not).  The interactive loop will print that history once it arrives
360       at top level.
361       Short of having all exceptions implicitly carry the full history, the
362       recommended way of using this facility is:
363         - compile your program with instrumentation "on"
364         - run it, when it raises an exception, look at the history
365         - if the history is "cut off" because of some handler, go and modify
366           your program so that it explicitly calls BTrace.trigger
367         - recompile (still instrumented), and rerun; look at the full history
368    
369    ----------------------------------------------------------------------
370    Name: Matthias Blume
371    Date: 2000/07/03 15:36:00 JST
372    Tag: blume-20000702-manual
373    Description:
374    
375    Small corrections and updates to CM manual.
376    
377    ----------------------------------------------------------------------
378    Name: Matthias Blume
379    Date: 2000/06/29 16:04:00 JST
380    Tag: blume-20000629-yacctool
381    Description:
382    
383    Changes:
384    
385    1. Class "mlyacc" now takes separate arguments to pass options to
386       generated .sml- and .sig-files independently.
387    2. Corresponding CM manual updates.
388    3. BTrace module now also reports call sites.  (However, for loop clusters
389       it only shows from where the cluster was entered.)  There are associated
390       modifications to core.sml, internals.{sig,sml}, btrace.sml, and btimp.sml.
391    
392    ----------------------------------------------------------------------
393    Name: Matthias Blume
394    Date: 2000/06/27 16:51:00 JST
395    Tag: blume-20000627-noweb
396    Description:
397    
398    Changes:
399    
400     1. Implemented "subdir" and "witness" options for noweb tool.
401        This caused some slight internal changes in CM's tool implementation.
402     2. Fixed bug in "tool plugin" mechanism.  This is essentially cleaning
403        some remaining issues from earlier path anchor changes.
404     3. Updated CM manual accordingly.
405    
406     4. Changed implementation of back-tracing so that I now consider it
407        ready for prime-time.
408    
409        In particular, you don't have to explicitly trigger the back-trace
410        anymore.  Instead, if you are running BTrace-instrumented code and
411        there is an uncaught exception (regardless of whether or not it was
412        raised in instrumented code), the top-level evalloop will print
413        the back-trace.
414    
415        Features:
416    
417          - Instrumented and uninstrumented code work together seemlessly.
418            (Of course, uninstrumented code is never mentioned in actual
419             back-traces.)
420    
421          - Asymptotic time- and space-complexity of instrumented code is
422            equal to that of uninstrumented code.  (This means that
423            tail-recursion is preserved by the instrumentation phase.)
424    
425          - Modules whose code has been instrumented in different sessions
426            work together without problem.
427    
428          - There is no penalty whatsoever on uninstrumented code.
429    
430          - There is no penalty on "raise" expressions, even in
431            instrumented code.
432    
433        A potential bug (or perhaps it is a feature, too):
434    
435          A back-trace reaches no further than the outermost instrumented
436          non-trivial "raise".  Here, a "trivial" raise is one that is the
437          sole RHS of a "handle" rule.  Thus, back-traces reach trough
438    
439               <exp> handle e => raise e
440    
441          and even
442    
443               <exp> handle Foo => raise Bar
444    
445          and, of course, through
446    
447               <exp> handle Foo => ...
448    
449         if the exception was not Foo.
450    
451         Back-traces always reach right through any un-instrumented code
452         including any of its "handle" expressions, trivial or not.
453    
454       To try this out, do the following:
455    
456         - Erase all existing binfiles for your program.
457           (You may keep binfiles for those modules where you think you
458            definitely don't need back-tracing.)
459         - Turn on back-trace instrumentation:
460              SMLofNJ.Internals.BTrace.mode (SOME true);
461         - Recompile your program.  (I.e., run "CM.make" or "use".)
462         - You may now turn instrumentation off again (if you want):
463              SMLofNJ.Internals.BTrace.mode (SOME false);
464         - Run your program as usual.  If it raises an exception that
465           reaches the interactive toplevel, then a back-trace will
466           automatically be printed.  After that, the toplevel loop
467           will print the exception history as usual.
468    
469    ----------------------------------------------------------------------
470    Name: Matthias Blume
471    Date: 2000/06/26 09:56:46 JST
472    Tag: blume-20000626-setup
473    Description:
474    
475    CM: - setup-parameter to "sml" added; this can be used to run arbitrary
476          ML code before and after compiling a file (e.g., to set compiler
477          flags)
478    
479    Compiler: - improved btrace API (in core.sml, internals.{sig,sml})
480              - associated changes to btrace.sml (BTrace instrumentation pass)
481              - cleaner implementation of btimp.sml (BTrace tracing and report
482                module)
483    
484    CM manual: * new path encoding documented
485               * description of setup-parameter to "sml" added
486    
487    The biggest user-visible change to back-tracing is that it is no
488    longer necessary to compile all traced modules within the same
489    session.  (This was a real limitation.)
490    
491    ----------------------------------------------------------------------
492    Name: Matthias Blume
493    Date: 2000/06/24 12:40:00 JST
494    Tag: blume-20000624-startup
495    Description:
496    
497    Fixes startup slowdown problem.  (I was calling SrcPath.sync a _tad_
498    bit too often -- to put it mildly. :)
499    
500    ----------------------------------------------------------------------
501    Name: Matthias Blume
502    Date: 2000/06/23 18:20:00 JST
503    Tag: blume-20000623-btrace
504    Description:
505    
506    This updates adds a backtrace facility to aid programmers in debugging
507    their programs.  This involves the following changes:
508    
509    1. Module system/smlnj/init/core.sml (structure _Core) now has hooks for
510       keeping track of the current call stack.  When programs are compiled
511       in a special mode, the compiler will insert calls to these hooks
512       into the user program.
513       "Hook" means that it is possible for different implementations of
514       back-tracing to register themselves (at different times).
515    
516    2. compiler/MiscUtil/profile/btrace.sml implements the annotation phase
517       as an Absyn.dec->Absyn.dec rewrite.  Normally this phase is turned off.
518       It can be turned on using this call:
519         SMLofNJ.Internals.BTrace.mode (SOME true);
520       Turning it off again:
521         SMLofNJ.Internals.BTrace.mode (SOME false);
522       Querying the current status:
523         SMLofNJ.Internals.BTrace.mode NONE;
524       Annotated programs are about twice as big as normal ones, and they
525       run a factor of 2 to 4 slower with a dummy back-trace plugin (one
526       where all hooks do nothing).  The slowdown with a plugin that is
527       actually useful (such as the one supplied by default) is even greater,
528       but in the case of the default plugin it is still only an constant
529       factor (amortized).
530    
531    3. system/Basis/Implementation/NJ/internals.{sig,sml} have been augmented
532       with a sub-structure BTrace for controlling back-tracing.  In particular,
533       the above-mentioned function "mode" controls whether the annotation
534       phase is invoked by the compiler.  Another important function is
535       "trigger": when called it aborts the current execution and causes
536       the top-level loop to print a full back-trace.
537    
538    4. compiler/MiscUtil/profile/btimp.sml is the current default plugin
539       for back-tracing.  It keeps track of the dynamic call stack and in
540       addition to that it keeps a partial history at each "level" of that
541       stack.  For example, if a tail-calls b, b tail-calls c, and c tail-calls
542       d and b (at separate times, dynamically), then the report will show:
543    
544       GOTO   d
545             /c
546       GOTO  \b
547       CALL   a
548    
549       This shows that there was an initial non-tail call of a, then a
550       tail-call to b or c, looping behavior in a cluster of functions that
551       consist of b and c, and then a goto from that cluster (i.e., either from
552       b or from c) to d.
553    
554       Note that (depending on the user program) the amount of information
555       that the back-trace module has to keep track of at each level is bounded
556       by a constant.  Thus, the whole implementation has the same asymptotical
557       complexity as the original program (both in space and in time).
558    
559    5. compiler/TopLevel/interact/evalloop.sml has been modified to
560       handle the special exception SMLofNJ.Internals.BTrace.BTrace
561       which is raised by the "trigger" function mentioned above.
562    
563    Notes on usage:
564    
565    - Annotated code works well together with unannotated code:
566    Unannotated calls simply do not show up at all in the backtrace.
567    
568    - It is not a good idea to let modules that were annotated during
569    different sessions run at the same time.  This is because the compiler
570    chooses small integers to identify individual functions, and there
571    will be clashes if different modules were compiled in separate sessions.
572    (Nothing will crash, and you will even be told about the clashes, but
573    back-trace information will in general not be useful.)
574    
575    - Back-tracing can be confused by callcc and capture.
576    
577    - The only way of getting a back-trace right now is to explicitly
578    invoke the "trigger" function from your user program.  Eventually, we
579    should make every exception carry back-trace information (if
580    available).  But since this creates more overhead at "raise"-time
581    (similar to the current exnHistory overhead), I have not yet
582    implemented this.  (The implementation will be rather easy.)  With
583    exceptions carrying back-trace information, this facility will be even
584    more useful because users don't need to modify their programs...
585    
586    - While it is possible to compile the compiler with back-trace
587    annotations turned on (I did it to get some confidence in
588    correctness), you must make absolutely sure that core.sml and
589    btimp.sml are compiled WITHOUT annotation!  (core.sml cannot actually
590    be compiled with annotation because there is no core access yet, but
591    if you compile btimp.sml with annotation, then the system will go into
592    an infinite recursion and crash.)
593    Since CM currently does not know about BTrace, the only way to turn
594    annotations on and off for different modules of the compiler is to
595    interrupt CMB.make, change the settings, and re-invoke it.  Of course,
596    this is awkward and clumsy.
597    
598    Sample sessions:
599    
600    Standard ML of New Jersey v110.28.1 [FLINT v1.5], June 5, 2000
601    - SMLofNJ.Internals.BTrace.mode (SOME true);
602    [autoloading]
603    [autoloading done]
604    val it = false : bool
605    - structure X = struct
606    -     fun main n = let
607    -         fun a (x, 0) = d x
608    -           | a (x, n) = b (x, n - 1)
609    -         and b (x, n) = c (x, n)
610    -         and c (x, n) = a (x, n)
611    -         and d x = e (x, 3)
612    -         and e (x, 0) = f x
613    -           | e (x, n) = e (x, n - 1)
614    -         and f 0 = SMLofNJ.Internals.BTrace.trigger ()
615    -           | f n = n * g (n - 1)
616    -         and g n = a (n, 3)
617    -     in
618    -         f n
619    -     end
620    - end;
621    structure X : sig val main : int -> int end
622    - X.main 3;
623    *** BACK-TRACE ***
624    GOTO   stdIn:4.2-13.20: X.main[2].f
625    GOTO-( stdIn:4.2-13.20: X.main[2].e
626    GOTO   stdIn:4.2-13.20: X.main[2].d
627         / stdIn:4.2-13.20: X.main[2].a
628         | stdIn:4.2-13.20: X.main[2].b
629    GOTO-\ stdIn:4.2-13.20: X.main[2].c
630    CALL   stdIn:4.2-13.20: X.main[2].g
631    GOTO   stdIn:4.2-13.20: X.main[2].f
632    GOTO-( stdIn:4.2-13.20: X.main[2].e
633    GOTO   stdIn:4.2-13.20: X.main[2].d
634         / stdIn:4.2-13.20: X.main[2].a
635         | stdIn:4.2-13.20: X.main[2].b
636    GOTO-\ stdIn:4.2-13.20: X.main[2].c
637    CALL   stdIn:4.2-13.20: X.main[2].g
638    GOTO   stdIn:4.2-13.20: X.main[2].f
639    GOTO-( stdIn:4.2-13.20: X.main[2].e
640    GOTO   stdIn:4.2-13.20: X.main[2].d
641         / stdIn:4.2-13.20: X.main[2].a
642         | stdIn:4.2-13.20: X.main[2].b
643    GOTO-\ stdIn:4.2-13.20: X.main[2].c
644    CALL   stdIn:4.2-13.20: X.main[2].g
645    GOTO   stdIn:4.2-13.20: X.main[2].f
646    CALL   stdIn:2.15-17.4: X.main[2]
647    -
648    
649    (Note that because of a FLINt bug the above code currently does not
650    compile without BTrace turned on.)
651    
652    Here is another example, using my modified Tiger compiler:
653    
654    Standard ML of New Jersey v110.28.1 [FLINT v1.5], June 5, 2000
655    - SMLofNJ.Internals.BTrace.mode (SOME true);
656    [autoloading]
657    [autoloading done]
658    val it = false : bool
659    - CM.make "sources.cm";
660    [autoloading]
661    ...
662    [autoloading done]
663    [scanning sources.cm]
664    [parsing (sources.cm):parse.sml]
665    [creating directory CM/SKEL ...]
666    [parsing (sources.cm):tiger.lex.sml]
667    ...
668    [wrote CM/sparc-unix/semant.sml]
669    [compiling (sources.cm):main.sml]
670    [wrote CM/sparc-unix/main.sml]
671    [New bindings added.]
672    val it = true : bool
673    - Main.compile ("../testcases/merge.tig", "foo.out");
674    *** BACK-TRACE ***
675    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trvar
676    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
677    CALL   lib/semant.sml:289.3-295.22: SemantFun[2].transExp.trexp.check[2]
678    GOTO   lib/semant.sml:289.3-295.22: SemantFun[2].transExp.trexp.check[2]
679    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
680    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
681    CALL   lib/semant.sml:488.3-505.6: SemantFun[2].transDec.trdec[2].transBody[2]
682         / lib/semant.sml:411.65-543.8: SemantFun[2].transDec
683    CALL-\ lib/semant.sml:413.2-540.9: SemantFun[2].transDec.trdec[2]
684    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
685    CALL   lib/semant.sml:8.52-558.4: SemantFun[2].transProg[2]
686    CALL   main.sml:1.18-118.4: Main.compile[2]
687    -
688    
689    ----------------------------------------------------------------------
690    Name: Matthias Blumen
691    Date: 2000/06/21 18:00:00 JST
692    Tag: blume-20000621-manual
693    Description:
694    
695    CM manual update: Path environments documented.
696    
697    ----------------------------------------------------------------------
698    Name: Matthias Blume
699    Date: 2000/06/19 13:40:00
700    Tag: blume-20000619-manual
701    Description:
702    
703    CM manual and system/README update.  This only covers the fact that
704    there are no more implicit anchors.  (Path environments and the "bind"
705    option to "cm" have yet to be documented.)
706    
707    ----------------------------------------------------------------------
708    Name: Matthias Blume
709    Date: 2000/06/19 11:05:00 JST
710    Tag: blume-20000619-chdir-bugfix
711    Description:
712    
713    Fixed a bug in new SrcPath module that sometimes led to a bad chDir call.
714    
715    ----------------------------------------------------------------------
716    Name: Matthias Blume
717    Date: 2000/06/18 22:00:10 JST
718    Tag: blume-20000618-implicit-anchors-really-gone
719    Description:
720    
721    I updates the previous HISTORY entry where I forgot to mention that
722    implicit anchors are no longer with us.
723    
724    The current update also gets rid of the (now useless) controller
725    CM.Control.implicit_anchors.
726    
727    ----------------------------------------------------------------------
728    Name: Matthias Blume
729    Date: 2000/06/16 17:30:00 JST
730    Tag: blume-20000616-anchorenv
731    Description:
732    
733    This patch implements the long anticipated (just kidding :) "anchor
734    environment" mechanism.  In the course of doing this, I also
735    re-implemented CM's internal "SrcPath" module from scratch.  The new
736    one should be more robust in certain boundary cases.  In any case, it
737    is a lot cleaner than its predecessor (IMHO).
738    
739    This time, although there is yet another boot file format change, I
740    kept the unpickler backward-compatible.  As a result, no new bootfiles
741    are necessary and bootstrapping is straightforward.  (You cannot read
742    new bootfiles into an old system, but the other way around is no
743    problem.)
744    
745    Visible changes:
746    
747    ** 0. Implicit path anchors (without the leading $-symbol) are no
748    longer recognized at all. This means that such path names are not
749    illegal either.  For example, the name basis.cm simply refers to a
750    local file called "basis.cm" (i.e, the name is an ordinary path
751    relative to .cm-files directory).  Or, to put it differently, only
752    names that start with $ are anchored paths.
753    
754    ** 1. The $<singlearc> abbreviation for $/<singlearc> has finally
755    vanished.
756    
757    John (Reppy) had critizised this as soon as I originally proposed and
758    implemented it, but at that time I did not really deeply believe
759    him. :) Now I came full-circle because I need the $<singlearc> syntax
760    in another place where it cannot be seen as an abbreviation for
761    $/<singlearc>.  To avoid the confusion, $<singlearc> now means what it
762    seems to mean (i.e., it "expands" into the corresponding anchor
763    value).
764    
765    However, when paths are used as members in CM description files, it
766    continues to be true that there must be at least another arc after the
767    anchor.  This is now enforced separately during semantic analysis
768    (i.e., from a lexical/syntactical point of view, the notation is ok.)
769    
770    ** 2. The "cm" class now accepts an option "bind".  The option's value
771    is a sub-option list of precisely two items -- one labeled "anchor"
772    and the other one labeled "value".  As you might expect, "anchor" is
773    used to specify an anchor name to be bound, and "value" specifies what
774    the anchor is being bound to.
775    
776    The value must be a directory name and can be given in either standard
777    syntax (including the possibility that it is itself an anchored path)
778    or native syntax.
779    
780    Examples:
781    
782       foo.cm (bind:(anchor:bar value:$mystuff/bar))
783       lib.cm (bind:(anchor:a value:"H:\\x\\y\\z"))  (* only works under windows *)
784    
785    and so on.
786    
787    The meaning of this is that the .cm-file will be processed with an
788    augmented anchor environment where the given anchor(s) is/are bound to
789    the given values(s).
790    
791    The rationale for having this feature is this: Suppose you are trying
792    to use two different (already stable) libraries a.cm and b.cm (that
793    you perhaps didn't write yourself).  Further, suppose each of these
794    two libraries internally uses its own auxiliary library $aux/lib.cm.
795    Normally you would now have a problem because the anchor "lib" can not
796    be bound to more than one value globally.  Therefore, the project that
797    uses both a.cm and b.cm must locally redirect the anchor to some other
798    place:
799    
800       a.cm (bind:(anchor:lib value:/usr/lib/smlnj/a-stuff))
801       b.cm (bind:(anchor:lib value:/usr/lib/smlnj/b-stuff))
802    
803    This hard-wires $lib/aux.cm to /usr/lib/smlnj/a-stuff/aux.cm or
804    /usr/lib/smlnj/b-stuff/aux.cm, respectively.
805    
806    Hard-wiring path names is a bit inflexible (and CM will verbosely warn
807    you when you do so at the time of CM.stabilize).  Therefore, you can
808    also use an anchored path as the value:
809    
810      a.cm (bind:(anchor:lib value:$a-lib))
811      b.cm (bind:(anchor:lib value:$b-lib))
812    
813    Now you can globally configure (using the usual CM.Anchor.anchor or
814    pathconfig machinery) bindings for "a-lib" and "b-lib".  Since "lib"
815    itself is always locally bound, setting it globally is no longer
816    meaningful or necessary (but it does not hurt either).  In fact, "lib"
817    can still be used as a global anchor for separate purposes.  As a
818    matter of fact, one can locally define "lib" in terms of a global
819    "lib":
820    
821      a.cm (bind:(anchor:lib value:$lib/a))
822      b.cm (bind:(anchor:lib value:$lib/b))
823    
824    ** 3: The encoding of path names has changed.  This affects the way
825    path names are shown in CM's progress report and also the internal
826    protocol encoding used for parallel make.
827    
828    The encoding now uses one or more ':'-separated segments.  Each
829    segments corresponds to a file that has been specified relative to the
830    file given by its preceding segment.  The first segment is either
831    relative to the CWD, absolute, or anchored.  Each segment itself is
832    basically a Unix pathname; all segments but the first are relative.
833    
834    Example:
835    
836       $foo/bar/baz.cm:a/b/c.sml
837    
838    This path denotes the file bar/a/b/c.sml relative to the directory
839    denoted by anchor "foo".  Notice that the encoding also includes
840    baz.cm which is the .cm-file that listed a/b/c.sml.  As usual, such
841    paths are resolved relative to the .cm-files directory, so baz.cm must
842    be ignored to get the "real" pathname.
843    
844    To make this fact more obvious, CM puts the names of such "virtual
845    arcs" into parentheses when they appear in progress reports. (No
846    parentheses will appear in the internal protocol encoding.)  Thus,
847    what you really see is:
848    
849      $foo/bar/(baz.cm):a/b/c.sml
850    
851    I find this notation to be much more informative than before.
852    
853    Another new feature of the encoding is that special characters
854    including parentheses, colons, (back)slashes, and white space are
855    written as \ddd (where ddd is the decimal encoding of the character).
856    
857    *** The CM manual still needs to be updated.
858    
859  ----------------------------------------------------------------------  ----------------------------------------------------------------------
860  Name: Allen Leung  Name: Allen Leung
861  Date: 2000/06/15 00:38:00  Date: 2000/06/15 00:38:00

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