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revision 643, Fri May 12 08:29:15 2000 UTC revision 756, Thu Dec 14 16:01:33 2000 UTC
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13  Description:  Description:
14  ----------------------------------------------------------------------  ----------------------------------------------------------------------
15  Name: Matthias Blume  Name: Matthias Blume
16    Date: 2000/12/15 00:01:05 JST
17    Tag: blume-20001215-dirtool
18    Description:
19    
20    - "dir" tool added.
21    - improvements and cleanup to Tools structure
22    - documentation updates
23    
24    ----------------------------------------------------------------------
25    Name: Allen Leung
26    Date: Thu Dec 14 03:45:24 EST 2000
27    Description:
28    Tag:  leunga-20001214-int-inf
29    Description:
30    
31       In IntInf, added these standard functions, which are missing from our
32    implementation:
33    
34        andb : int * int -> int
35        xorb : int * int -> int
36        orb  : int * int -> int
37        notb : int -> int
38         <<   : int * word -> int
39        ~>>  : int * word -> int
40    
41       Not tested, I hope they are correct.
42    
43    ----------------------------------------------------------------------
44    Name: Allen Leung
45    Date: Fri Dec  8 19:23:26 EST 2000
46    Description:
47    Tag:  leunga-20001208-nowhere
48    Description:
49    
50      Slight improvements to the 'nowhere' tool to handle OR-patterns,
51    to generate better error messages etc.  Plus a brief manual.
52    
53    ----------------------------------------------------------------------
54    Name: Lal George
55    Date: 2000/12/08 09:54:02 EST 2000
56    Tag: Release_110_31
57    Description:
58    
59    - Version 110.31
60    ----------------------------------------------------------------------
61    Name: Allen Leung
62    Date: Thu Dec  7 22:01:04 EST 2000
63    Tag:  leunga-20001207-cell-monster-hack
64    Description:
65    
66    Major MLRISC internal changes.  Affect all clients.
67    Summary:
68    
69    1.  Type CELLS.cell = int is now replaced by a datatype.
70        As a result, the old regmap is now gone.  Almost all interfaces
71        in MLRISC change as a consequence.
72    
73    2.  A new brand version of machine description tool (v3.0) that generates
74        modules expecting the new interface.  The old version is removed.
75    
76    3.  The RA interface has been further abstracted into two new functors.
77        RISC_RA and X86RA.  These functors have much simpler interfaces.
78        [See also directory MLRISC/demo.]
79    
80    4.  Some other new source->source code generation tools are available:
81    
82        a. MLRISC/Tools/RewriteGen -- generate rewriters from rules.
83        b. MLRISC/Tools/WhereGen -- expands conditional pattern matching rules.
84           I use this tool to generate the peephole optimizers---with the new
85           cell type changes, peephole rules are becoming difficult to write
86           without conditional pattern matching.
87    
88    5.  More Intmap -> IntHashTable change.  Previous changes by Matthias didn't
89        cover the entire MLRISC source tree so many things broke.
90    
91    6.  CM files have been moved to the subdirectory MLRISC/cm.
92        They are moved because there are a lot of them and they clutter up the
93        root dir.
94    
95    7.  More detailed documentation to come...
96    
97        NOTE: To rebuild from 110.30 (ftp distribution), you'll have to do
98        a makeml -rebuild first.  This is because of other other
99        changes that Matthias has made (see below).
100    
101    
102    ----------------------------------------------------------------------
103    Name: Matthias Blume
104    Date: 2000/11/30 23:12:00 JST
105    Tag: blume-20001130-filereorg
106    Description:
107    
108    Some manual updates and some file reorganizations in CM.
109    
110    ----------------------------------------------------------------------
111    Name: Matthias Blume
112    Date: 2000/11/24 17:45:00 JST
113    Tag: blume-20001124-link
114    Description:
115    
116    Drastically improved link traversal code for the case that the dynamic
117    value was already loaded at bootstrap time.  As a result, CM and CMB
118    now both load blazingly fast -- even on a very slow machine.  Also,
119    memory consumption has been further reduced by this.
120    
121    Warning: The format of the PIDMAP file has changed.  THerefore, to
122    bootstrap you have to do this:
123    
124    1. Run CMB.make
125    2. Make a symbolic link for the boot directory:
126         ln -s sml.boot.ARCH-OS xxx
127    3. "Rebuild" the boot directory:
128         ./makeml -boot xxx -rebuild sml ; rm xxx
129    4. Boot normally:
130          ./makeml
131    
132    ----------------------------------------------------------------------
133    Name: Matthias Blume
134    Date: 2000/11/21 21:20:00 JST
135    Tag: blume-20001121-tools
136    Description:
137    
138    Continued hacking on autoloading problem -- with success this time.
139    Also changed tool-plugin mechanism.  See new CM manual.
140    
141    ----------------------------------------------------------------------
142    Name: Matthias Blume
143    Date: 2000/11/19 14:30:00 JST
144    Tag:  blume-20001119-autoload
145    Description:
146    
147    Some hacking to make autoloading faster.  Success for CMB, no success
148    so far for CM.  There is a reduced structure CM' that autoloads faster.
149    (This is a temporary, non-documented hack to be eliminated again when
150    the general problem is solved.)
151    
152    ----------------------------------------------------------------------
153    Name: Matthias Blume
154    Date: 2000/11/17 14:10:00 JST
155    Tag: blume-20001117-pickle-lib
156    Description:
157    
158    1. Eliminated comp-lib.cm
159    2. Made pickle-lib.cm
160    3. Eliminated all uses of intset.sml (from comp-lib.cm)
161    4. Replaced all uses of intmap.{sig,sml} (from comp-lib.cm) with
162       equivalent constructs from smlnj-lib.cm (INtHashTable).
163    5. Point 4. also goes for those uses of intmap.* in MLRISC.
164       Duplicated intmap modules thrown out.
165    6. Hunted down all duplicated SCC code and replaced it with
166       equivalent stuff (GraphSCCFn from smlnj-lib.cm).
167    7. Rewrote Feedback module.
168    8. Moved sortedlist.sml into viscomp-lib.cm.  Eventually it
169       should be thrown out and equivalent modules from smlnj-lib.cm
170       should be used (IntRedBlackSet, IntListSet, ...).
171    
172    Confirmed that compiler compiles to fixpoint.
173    
174    ----------------------------------------------------------------------
175    Name: Allen Leung
176    Date: 2000/11/10 18:00:00
177    Tag: leunga-20001110-new-x86-fp
178    
179    A new x86 floating point code generator has been added.
180    By default this is turned off.  To turn this on, do:
181    
182        CM.autoload "$smlnj/compiler.cm";
183        Compiler.Control.MLRISC.getFlag "x86-fast-fp" := true;
184    
185    Changes:
186    
187    1.  Changed FTAN to FPTAN so that the assembly output is correct.
188    2.  Changed the extension callback for FTANGENT to generate:
189    
190              fptan
191              fstp  %st(0)
192        instead of
193              fptan
194              fstpl ftempmem
195    
196    3.  Numerous assembly fixes for x86.
197    
198    5.  Cleaned up the machine code output module x86/x86MC.sml and added
199        support for a whole bunch of instructions and addressing modes:
200    
201          fadd/fsub/fsubr/fmul/fdiv/fdivr  %st, %st(n)
202          faddp/fsubp/fsubrp/fmulp/fdivp/fdivrp  %st, %st(n)
203          fadd/fsub/fsubr/fmul/fdiv/fdivr  %st(n), %st
204          fiadd/fisub/fisubr/fimul/fidiv/fidivr mem
205          fxch %st(n)
206          fld %st(n)
207          fst %st(n)
208          fst mem
209          fstp %st(n)
210          fucom %st(n)
211          fucomp %st(n)
212    
213        All these are now generated when the fast fp mode is turned on.
214    
215    6.  Removed the dedicated registers %st(0), ..., %st(7) from X86CpsRegs
216    
217    ----------------------------------------------------------------------
218    Name: Matthias Blume
219    Date: 2000/11/09 11:20:00 JST
220    Tag: blume-20001109-scc
221    Description:
222    
223    Eliminated some code duplication:
224    
225    1. Added "where" clause to GraphSCCFn in SML/NJ Library.
226       (Otherwise the functor is useless.)
227    2. Used GraphSCCFn where SCCUtilFun was used previously.
228    3. Got rid of SCCUtilFun (in comp-lib.cm).
229    
230    ----------------------------------------------------------------------
231    Name: Lal George
232    Date: 2000/11/06 09:02:21 EST 2000
233    Tag: Release_110_30
234    Description:
235    
236    - Version 110.30
237    ----------------------------------------------------------------------
238    Name: Matthias Blume
239    Date: 2000/11/04 14:45:00
240    Tag: blume-20001104-mlbuild
241    Description:
242    
243    - Made ml-build faster on startup.
244    - Documentation fixes.
245    
246    ----------------------------------------------------------------------
247    Name: Matthias Blume
248    Date: 2000/11/02 17:00:00 JST
249    Tag: blume-20001102-condcomp
250    Description:
251    
252    - Small tweaks to pickler -- new BOOTFILES!
253    - Version bumped to 110.29.2.
254    - Added conditional compilation facility to init.cmi (see comment there).
255    ----------------------------------------------------------------------
256    Name: Allen Leung
257    Date: 2000/10/23 19:31:00
258    Tag: leunga-20001023-demo-ra
259    
260    1. Minor RA changes that improves spilling on x86 (affects Moby and C-- only)
261    2. Test programs for the graph library updated
262    3. Some new MLRISC demo programs added
263    
264    ----------------------------------------------------------------------
265    Name: Matthias Blume
266    Date: 2000/08/31 22:15:00 JST
267    Tag: blume-20001017-errmsg
268    Description:
269    
270    More error message grief: Where there used to be no messages, there
271    now were some that had bogus error regions.  Fixed.
272    
273    ----------------------------------------------------------------------
274    Name: Matthias Blume
275    Date: 2000/08/31 17:30:00 JST
276    Tag: blume-20001017-v110p29p1
277    Description:
278    
279    I made a version 110.29.1 with new bootfiles.
280    
281    Changes:  Modified pickler/unpickler for faster and leaner unpickling.
282              CM documentation changes and a small bugfix in CM's error reporting.
283    
284    ----------------------------------------------------------------------
285    Name: Lal George
286    Date: 2000/09/27 14:42:35 EDT
287    Tag: george-20000927-nodestatus
288    Description:
289    
290    Changed the type of the nodestatus, so that:
291    
292            SPILLED(~1)             is now SPILLED
293            SPILLED(m) where m>=0   is now MEMREG(m)
294            SPILLED(s) where s<~1   is now SPILL_LOC(~s)
295    
296    ----------------------------------------------------------------------
297    Name: Matthias Blume
298    Date: 2000/09/07 14:45:00 JST
299    Tag: blume-20000907-cmerrmsg
300    Description:
301    
302    Small tweak to CM to avoid getting ML syntax error messages twice.
303    
304    ----------------------------------------------------------------------
305    Name: Matthias Blume
306    Date: 2000/08/31 18:00:00 JST
307    Tag: blume-20000831-cvsbootfiles
308    Description:
309    
310    New URL for boot files (because the 110.29 files on the BL server do
311    now work correctly with my updated install scripts for yacc and lex).
312    
313    ----------------------------------------------------------------------
314    Name: Matthias Blume
315    Date: 2000/08/08 12:33:00 JST
316    Tag: blume-20000808-manual
317    Description:
318    
319    Tiny update to CM manual.
320    
321    ----------------------------------------------------------------------
322    Name: Allen Leung
323    Date: 2000/08/7 19:31:00
324    Tag: leunga-20000807-a-whole-bunch-of-stuff
325    
326      Moby, C--, SSA, x86, machine descriptions etc.  Should only affect C--
327    and Mobdy.
328    
329    1.  x86
330    
331       a.  Fixes to peephole module by John and Dan.
332       b.  Assembly fix to SETcc by Allen.
333       c.  Fix to c-call by John.
334       d.  Fix to spilling by John.  (This one deals with the missing FSTPT case)
335       e.  Instruction selection optimization to SETcc as suggested by John.
336    
337           For example,
338    
339            MV(32, x, COND(32, CMP(32, LT, a, b), LI 1, LI 0))
340    
341           should generate:
342    
343            MOVL a, x
344            SUBL b, x
345            SHRL 31, x
346    
347    2.  IR stuff
348    
349         A bunch of new DJ-graph related algorithms added.  These
350         speed up SSA construction.
351    
352    3.  SSA + Scheduling
353    
354         Added code for SSA and scheduling to the repository
355    
356    ----------------------------------------------------------------------
357    Name: Lal George
358    Date: 2000/07/27 11:53:14 EDT
359    
360    Tag: lal-20000727-linux-ppc
361    Description:
362    
363     Made changes to support Linux PPC.
364     p.s. I have confirmation that the 110.29 boot files work fine.
365    
366    ----------------------------------------------------------------------
367    Name: Matthias Blume
368    Date: 2000/07/27 17:40:00 JST
369    Tag: blume-20000727-scripts
370    Description:
371    
372    !!!! WARNING !!!!
373    You must recompile the runtime system!
374    !!!! WARNING !!!!
375    
376    This is basically another round of script-enhancements:
377    
378    1. sml, ml-build, and ml-makedepend accept options -D and -U to define
379       and undefine CM preprocessor symbols.
380    
381    2. ml-build avoids generating a new heap image if it finds that the
382       existing one is still ok.  (The condition is that no ML file had to
383       be recompiled and all ML files are found to be older that the heap
384       file.)
385    
386       To make this work smoothly, I also hacked the runtime system as
387       well as SMLofNJ.SysInfo to get access to the heap image suffix
388       (.sparc-solaris, ...) that is currently being used.
389    
390       Moreover, the signature of CM.mk_standalone has changed.  See the
391       CM manual.
392    
393    3. ml-makedepend accepts additional options -n, -a, and -o.  (See the
394       CM manual for details.)
395    
396    4. More CM manual updates:
397        - all of the above has been documented.
398        - there is now a section describing the (CM-related) command line
399          arguments that are accepted by the "sml" command
400    
401    ----------------------------------------------------------------------
402    Name: Matthias Blume
403    Date: 2000/07/25 16:20:00 JST
404    Tag: blume-20000725-makedepend
405    Description:
406    
407    Added a script called ml-makedepend.  This can be used in makefiles
408    for Unix' make in a way very similar to the "makedepend" command for
409    C.
410    
411    The script internally uses function CM.sources.
412    
413    Synopsis:
414    
415        ml-makedepend [-f makefile] cmfile targetname
416    
417    The default for the makefile is "makefile" (or "Makefile" should
418    "makefile" not exist).
419    
420    ml-makedepend adds a cmfile/targetname-specific section to this
421    makefile (after removing the previous version of this section).  The
422    section contains a single dependency specification with targetname on
423    the LHS (targetname is an arbitrary name), and a list of files derived
424    from the cmfile on the RHS.  Some of the files on the RHS are
425    ARCH/OPSYS-specific.  Therefore, ml-makedepend inserts references to
426    "make" variables $(ARCH) and $(OPSYS) in place of the corresponding
427    path names.  The makefile writer is responsible for making sure that
428    these variables have correct at the time "make" is invoked.
429    
430    ----------------------------------------------------------------------
431    Name: Matthias Blume
432    Date: 2000/07/22 23:30:00 JST
433    Tag: blume-20000722-urlupdate
434    Description:
435    
436    Changed BOOT and config/srcarchiveurl to point to BL server:
437    
438        ftp://ftp.research.bell-labs.com/dist/smlnj/working/110.29/
439    
440    ----------------------------------------------------------------------
441    Name: Matthias Blume
442    Date: 2000/07/18 18:00:00 JST
443    Tag: blume-20000718-Version_110_29
444    Description:
445    
446    1. Updated src/compiler/TopLevel/main/version.sml to version 110.29
447    
448    2. Updated config/version to 110.29
449    
450    3. Updated config/srcarchiveurl
451    
452    3. New boot files!
453       ftp://ftp.cs.princeton.edu/pub/people/blume/sml/110.29-autofetch
454    
455    ----------------------------------------------------------------------
456    Name: Matthias Blume
457    Date: 2000/07/11 13:58:00 JST
458    Tag: blume-20000711-doctypo
459    Description:
460    
461    Fixed a few typos in CM manual.
462    
463    ----------------------------------------------------------------------
464    Name: Allen Leung
465    Date: 2000/06/15 00:38:00
466    Tag: leunga-20000704-sparc-x86
467    
468    1. x86 peephole improvement sp += k; sp -= k => nop  [from John]
469    2. fix to x86 RET bug [found by Dan Grossman]
470    3. sparc assembly bug fix for ticc instructions [found by Fermin]
471    
472       Affects c-- and moby only
473    
474    ----------------------------------------------------------------------
475    Name: Matthias Blume
476    Date: 2000/07/04 15:26:00
477    Tag: blume-20000704-trigger
478    Description:
479    
480    1. Improvements to CM manual.
481    2. SMLofNJ.Internals.BTrace.trigger reinstated as an alternative way
482       of getting a back-trace.  The function, when called, raises an
483       internal exception which explicitly carries the full back-trace history,
484       so it is unaffected by any intervening handle-raise pairs ("trivial"
485       or not).  The interactive loop will print that history once it arrives
486       at top level.
487       Short of having all exceptions implicitly carry the full history, the
488       recommended way of using this facility is:
489         - compile your program with instrumentation "on"
490         - run it, when it raises an exception, look at the history
491         - if the history is "cut off" because of some handler, go and modify
492           your program so that it explicitly calls BTrace.trigger
493         - recompile (still instrumented), and rerun; look at the full history
494    
495    ----------------------------------------------------------------------
496    Name: Matthias Blume
497    Date: 2000/07/03 15:36:00 JST
498    Tag: blume-20000702-manual
499    Description:
500    
501    Small corrections and updates to CM manual.
502    
503    ----------------------------------------------------------------------
504    Name: Matthias Blume
505    Date: 2000/06/29 16:04:00 JST
506    Tag: blume-20000629-yacctool
507    Description:
508    
509    Changes:
510    
511    1. Class "mlyacc" now takes separate arguments to pass options to
512       generated .sml- and .sig-files independently.
513    2. Corresponding CM manual updates.
514    3. BTrace module now also reports call sites.  (However, for loop clusters
515       it only shows from where the cluster was entered.)  There are associated
516       modifications to core.sml, internals.{sig,sml}, btrace.sml, and btimp.sml.
517    
518    ----------------------------------------------------------------------
519    Name: Matthias Blume
520    Date: 2000/06/27 16:51:00 JST
521    Tag: blume-20000627-noweb
522    Description:
523    
524    Changes:
525    
526     1. Implemented "subdir" and "witness" options for noweb tool.
527        This caused some slight internal changes in CM's tool implementation.
528     2. Fixed bug in "tool plugin" mechanism.  This is essentially cleaning
529        some remaining issues from earlier path anchor changes.
530     3. Updated CM manual accordingly.
531    
532     4. Changed implementation of back-tracing so that I now consider it
533        ready for prime-time.
534    
535        In particular, you don't have to explicitly trigger the back-trace
536        anymore.  Instead, if you are running BTrace-instrumented code and
537        there is an uncaught exception (regardless of whether or not it was
538        raised in instrumented code), the top-level evalloop will print
539        the back-trace.
540    
541        Features:
542    
543          - Instrumented and uninstrumented code work together seemlessly.
544            (Of course, uninstrumented code is never mentioned in actual
545             back-traces.)
546    
547          - Asymptotic time- and space-complexity of instrumented code is
548            equal to that of uninstrumented code.  (This means that
549            tail-recursion is preserved by the instrumentation phase.)
550    
551          - Modules whose code has been instrumented in different sessions
552            work together without problem.
553    
554          - There is no penalty whatsoever on uninstrumented code.
555    
556          - There is no penalty on "raise" expressions, even in
557            instrumented code.
558    
559        A potential bug (or perhaps it is a feature, too):
560    
561          A back-trace reaches no further than the outermost instrumented
562          non-trivial "raise".  Here, a "trivial" raise is one that is the
563          sole RHS of a "handle" rule.  Thus, back-traces reach trough
564    
565               <exp> handle e => raise e
566    
567          and even
568    
569               <exp> handle Foo => raise Bar
570    
571          and, of course, through
572    
573               <exp> handle Foo => ...
574    
575         if the exception was not Foo.
576    
577         Back-traces always reach right through any un-instrumented code
578         including any of its "handle" expressions, trivial or not.
579    
580       To try this out, do the following:
581    
582         - Erase all existing binfiles for your program.
583           (You may keep binfiles for those modules where you think you
584            definitely don't need back-tracing.)
585         - Turn on back-trace instrumentation:
586              SMLofNJ.Internals.BTrace.mode (SOME true);
587         - Recompile your program.  (I.e., run "CM.make" or "use".)
588         - You may now turn instrumentation off again (if you want):
589              SMLofNJ.Internals.BTrace.mode (SOME false);
590         - Run your program as usual.  If it raises an exception that
591           reaches the interactive toplevel, then a back-trace will
592           automatically be printed.  After that, the toplevel loop
593           will print the exception history as usual.
594    
595    ----------------------------------------------------------------------
596    Name: Matthias Blume
597    Date: 2000/06/26 09:56:46 JST
598    Tag: blume-20000626-setup
599    Description:
600    
601    CM: - setup-parameter to "sml" added; this can be used to run arbitrary
602          ML code before and after compiling a file (e.g., to set compiler
603          flags)
604    
605    Compiler: - improved btrace API (in core.sml, internals.{sig,sml})
606              - associated changes to btrace.sml (BTrace instrumentation pass)
607              - cleaner implementation of btimp.sml (BTrace tracing and report
608                module)
609    
610    CM manual: * new path encoding documented
611               * description of setup-parameter to "sml" added
612    
613    The biggest user-visible change to back-tracing is that it is no
614    longer necessary to compile all traced modules within the same
615    session.  (This was a real limitation.)
616    
617    ----------------------------------------------------------------------
618    Name: Matthias Blume
619    Date: 2000/06/24 12:40:00 JST
620    Tag: blume-20000624-startup
621    Description:
622    
623    Fixes startup slowdown problem.  (I was calling SrcPath.sync a _tad_
624    bit too often -- to put it mildly. :)
625    
626    ----------------------------------------------------------------------
627    Name: Matthias Blume
628    Date: 2000/06/23 18:20:00 JST
629    Tag: blume-20000623-btrace
630    Description:
631    
632    This updates adds a backtrace facility to aid programmers in debugging
633    their programs.  This involves the following changes:
634    
635    1. Module system/smlnj/init/core.sml (structure _Core) now has hooks for
636       keeping track of the current call stack.  When programs are compiled
637       in a special mode, the compiler will insert calls to these hooks
638       into the user program.
639       "Hook" means that it is possible for different implementations of
640       back-tracing to register themselves (at different times).
641    
642    2. compiler/MiscUtil/profile/btrace.sml implements the annotation phase
643       as an Absyn.dec->Absyn.dec rewrite.  Normally this phase is turned off.
644       It can be turned on using this call:
645         SMLofNJ.Internals.BTrace.mode (SOME true);
646       Turning it off again:
647         SMLofNJ.Internals.BTrace.mode (SOME false);
648       Querying the current status:
649         SMLofNJ.Internals.BTrace.mode NONE;
650       Annotated programs are about twice as big as normal ones, and they
651       run a factor of 2 to 4 slower with a dummy back-trace plugin (one
652       where all hooks do nothing).  The slowdown with a plugin that is
653       actually useful (such as the one supplied by default) is even greater,
654       but in the case of the default plugin it is still only an constant
655       factor (amortized).
656    
657    3. system/Basis/Implementation/NJ/internals.{sig,sml} have been augmented
658       with a sub-structure BTrace for controlling back-tracing.  In particular,
659       the above-mentioned function "mode" controls whether the annotation
660       phase is invoked by the compiler.  Another important function is
661       "trigger": when called it aborts the current execution and causes
662       the top-level loop to print a full back-trace.
663    
664    4. compiler/MiscUtil/profile/btimp.sml is the current default plugin
665       for back-tracing.  It keeps track of the dynamic call stack and in
666       addition to that it keeps a partial history at each "level" of that
667       stack.  For example, if a tail-calls b, b tail-calls c, and c tail-calls
668       d and b (at separate times, dynamically), then the report will show:
669    
670       GOTO   d
671             /c
672       GOTO  \b
673       CALL   a
674    
675       This shows that there was an initial non-tail call of a, then a
676       tail-call to b or c, looping behavior in a cluster of functions that
677       consist of b and c, and then a goto from that cluster (i.e., either from
678       b or from c) to d.
679    
680       Note that (depending on the user program) the amount of information
681       that the back-trace module has to keep track of at each level is bounded
682       by a constant.  Thus, the whole implementation has the same asymptotical
683       complexity as the original program (both in space and in time).
684    
685    5. compiler/TopLevel/interact/evalloop.sml has been modified to
686       handle the special exception SMLofNJ.Internals.BTrace.BTrace
687       which is raised by the "trigger" function mentioned above.
688    
689    Notes on usage:
690    
691    - Annotated code works well together with unannotated code:
692    Unannotated calls simply do not show up at all in the backtrace.
693    
694    - It is not a good idea to let modules that were annotated during
695    different sessions run at the same time.  This is because the compiler
696    chooses small integers to identify individual functions, and there
697    will be clashes if different modules were compiled in separate sessions.
698    (Nothing will crash, and you will even be told about the clashes, but
699    back-trace information will in general not be useful.)
700    
701    - Back-tracing can be confused by callcc and capture.
702    
703    - The only way of getting a back-trace right now is to explicitly
704    invoke the "trigger" function from your user program.  Eventually, we
705    should make every exception carry back-trace information (if
706    available).  But since this creates more overhead at "raise"-time
707    (similar to the current exnHistory overhead), I have not yet
708    implemented this.  (The implementation will be rather easy.)  With
709    exceptions carrying back-trace information, this facility will be even
710    more useful because users don't need to modify their programs...
711    
712    - While it is possible to compile the compiler with back-trace
713    annotations turned on (I did it to get some confidence in
714    correctness), you must make absolutely sure that core.sml and
715    btimp.sml are compiled WITHOUT annotation!  (core.sml cannot actually
716    be compiled with annotation because there is no core access yet, but
717    if you compile btimp.sml with annotation, then the system will go into
718    an infinite recursion and crash.)
719    Since CM currently does not know about BTrace, the only way to turn
720    annotations on and off for different modules of the compiler is to
721    interrupt CMB.make, change the settings, and re-invoke it.  Of course,
722    this is awkward and clumsy.
723    
724    Sample sessions:
725    
726    Standard ML of New Jersey v110.28.1 [FLINT v1.5], June 5, 2000
727    - SMLofNJ.Internals.BTrace.mode (SOME true);
728    [autoloading]
729    [autoloading done]
730    val it = false : bool
731    - structure X = struct
732    -     fun main n = let
733    -         fun a (x, 0) = d x
734    -           | a (x, n) = b (x, n - 1)
735    -         and b (x, n) = c (x, n)
736    -         and c (x, n) = a (x, n)
737    -         and d x = e (x, 3)
738    -         and e (x, 0) = f x
739    -           | e (x, n) = e (x, n - 1)
740    -         and f 0 = SMLofNJ.Internals.BTrace.trigger ()
741    -           | f n = n * g (n - 1)
742    -         and g n = a (n, 3)
743    -     in
744    -         f n
745    -     end
746    - end;
747    structure X : sig val main : int -> int end
748    - X.main 3;
749    *** BACK-TRACE ***
750    GOTO   stdIn:4.2-13.20: X.main[2].f
751    GOTO-( stdIn:4.2-13.20: X.main[2].e
752    GOTO   stdIn:4.2-13.20: X.main[2].d
753         / stdIn:4.2-13.20: X.main[2].a
754         | stdIn:4.2-13.20: X.main[2].b
755    GOTO-\ stdIn:4.2-13.20: X.main[2].c
756    CALL   stdIn:4.2-13.20: X.main[2].g
757    GOTO   stdIn:4.2-13.20: X.main[2].f
758    GOTO-( stdIn:4.2-13.20: X.main[2].e
759    GOTO   stdIn:4.2-13.20: X.main[2].d
760         / stdIn:4.2-13.20: X.main[2].a
761         | stdIn:4.2-13.20: X.main[2].b
762    GOTO-\ stdIn:4.2-13.20: X.main[2].c
763    CALL   stdIn:4.2-13.20: X.main[2].g
764    GOTO   stdIn:4.2-13.20: X.main[2].f
765    GOTO-( stdIn:4.2-13.20: X.main[2].e
766    GOTO   stdIn:4.2-13.20: X.main[2].d
767         / stdIn:4.2-13.20: X.main[2].a
768         | stdIn:4.2-13.20: X.main[2].b
769    GOTO-\ stdIn:4.2-13.20: X.main[2].c
770    CALL   stdIn:4.2-13.20: X.main[2].g
771    GOTO   stdIn:4.2-13.20: X.main[2].f
772    CALL   stdIn:2.15-17.4: X.main[2]
773    -
774    
775    (Note that because of a FLINt bug the above code currently does not
776    compile without BTrace turned on.)
777    
778    Here is another example, using my modified Tiger compiler:
779    
780    Standard ML of New Jersey v110.28.1 [FLINT v1.5], June 5, 2000
781    - SMLofNJ.Internals.BTrace.mode (SOME true);
782    [autoloading]
783    [autoloading done]
784    val it = false : bool
785    - CM.make "sources.cm";
786    [autoloading]
787    ...
788    [autoloading done]
789    [scanning sources.cm]
790    [parsing (sources.cm):parse.sml]
791    [creating directory CM/SKEL ...]
792    [parsing (sources.cm):tiger.lex.sml]
793    ...
794    [wrote CM/sparc-unix/semant.sml]
795    [compiling (sources.cm):main.sml]
796    [wrote CM/sparc-unix/main.sml]
797    [New bindings added.]
798    val it = true : bool
799    - Main.compile ("../testcases/merge.tig", "foo.out");
800    *** BACK-TRACE ***
801    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trvar
802    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
803    CALL   lib/semant.sml:289.3-295.22: SemantFun[2].transExp.trexp.check[2]
804    GOTO   lib/semant.sml:289.3-295.22: SemantFun[2].transExp.trexp.check[2]
805    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
806    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
807    CALL   lib/semant.sml:488.3-505.6: SemantFun[2].transDec.trdec[2].transBody[2]
808         / lib/semant.sml:411.65-543.8: SemantFun[2].transDec
809    CALL-\ lib/semant.sml:413.2-540.9: SemantFun[2].transDec.trdec[2]
810    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
811    CALL   lib/semant.sml:8.52-558.4: SemantFun[2].transProg[2]
812    CALL   main.sml:1.18-118.4: Main.compile[2]
813    -
814    
815    ----------------------------------------------------------------------
816    Name: Matthias Blumen
817    Date: 2000/06/21 18:00:00 JST
818    Tag: blume-20000621-manual
819    Description:
820    
821    CM manual update: Path environments documented.
822    
823    ----------------------------------------------------------------------
824    Name: Matthias Blume
825    Date: 2000/06/19 13:40:00
826    Tag: blume-20000619-manual
827    Description:
828    
829    CM manual and system/README update.  This only covers the fact that
830    there are no more implicit anchors.  (Path environments and the "bind"
831    option to "cm" have yet to be documented.)
832    
833    ----------------------------------------------------------------------
834    Name: Matthias Blume
835    Date: 2000/06/19 11:05:00 JST
836    Tag: blume-20000619-chdir-bugfix
837    Description:
838    
839    Fixed a bug in new SrcPath module that sometimes led to a bad chDir call.
840    
841    ----------------------------------------------------------------------
842    Name: Matthias Blume
843    Date: 2000/06/18 22:00:10 JST
844    Tag: blume-20000618-implicit-anchors-really-gone
845    Description:
846    
847    I updates the previous HISTORY entry where I forgot to mention that
848    implicit anchors are no longer with us.
849    
850    The current update also gets rid of the (now useless) controller
851    CM.Control.implicit_anchors.
852    
853    ----------------------------------------------------------------------
854    Name: Matthias Blume
855    Date: 2000/06/16 17:30:00 JST
856    Tag: blume-20000616-anchorenv
857    Description:
858    
859    This patch implements the long anticipated (just kidding :) "anchor
860    environment" mechanism.  In the course of doing this, I also
861    re-implemented CM's internal "SrcPath" module from scratch.  The new
862    one should be more robust in certain boundary cases.  In any case, it
863    is a lot cleaner than its predecessor (IMHO).
864    
865    This time, although there is yet another boot file format change, I
866    kept the unpickler backward-compatible.  As a result, no new bootfiles
867    are necessary and bootstrapping is straightforward.  (You cannot read
868    new bootfiles into an old system, but the other way around is no
869    problem.)
870    
871    Visible changes:
872    
873    ** 0. Implicit path anchors (without the leading $-symbol) are no
874    longer recognized at all. This means that such path names are not
875    illegal either.  For example, the name basis.cm simply refers to a
876    local file called "basis.cm" (i.e, the name is an ordinary path
877    relative to .cm-files directory).  Or, to put it differently, only
878    names that start with $ are anchored paths.
879    
880    ** 1. The $<singlearc> abbreviation for $/<singlearc> has finally
881    vanished.
882    
883    John (Reppy) had critizised this as soon as I originally proposed and
884    implemented it, but at that time I did not really deeply believe
885    him. :) Now I came full-circle because I need the $<singlearc> syntax
886    in another place where it cannot be seen as an abbreviation for
887    $/<singlearc>.  To avoid the confusion, $<singlearc> now means what it
888    seems to mean (i.e., it "expands" into the corresponding anchor
889    value).
890    
891    However, when paths are used as members in CM description files, it
892    continues to be true that there must be at least another arc after the
893    anchor.  This is now enforced separately during semantic analysis
894    (i.e., from a lexical/syntactical point of view, the notation is ok.)
895    
896    ** 2. The "cm" class now accepts an option "bind".  The option's value
897    is a sub-option list of precisely two items -- one labeled "anchor"
898    and the other one labeled "value".  As you might expect, "anchor" is
899    used to specify an anchor name to be bound, and "value" specifies what
900    the anchor is being bound to.
901    
902    The value must be a directory name and can be given in either standard
903    syntax (including the possibility that it is itself an anchored path)
904    or native syntax.
905    
906    Examples:
907    
908       foo.cm (bind:(anchor:bar value:$mystuff/bar))
909       lib.cm (bind:(anchor:a value:"H:\\x\\y\\z"))  (* only works under windows *)
910    
911    and so on.
912    
913    The meaning of this is that the .cm-file will be processed with an
914    augmented anchor environment where the given anchor(s) is/are bound to
915    the given values(s).
916    
917    The rationale for having this feature is this: Suppose you are trying
918    to use two different (already stable) libraries a.cm and b.cm (that
919    you perhaps didn't write yourself).  Further, suppose each of these
920    two libraries internally uses its own auxiliary library $aux/lib.cm.
921    Normally you would now have a problem because the anchor "lib" can not
922    be bound to more than one value globally.  Therefore, the project that
923    uses both a.cm and b.cm must locally redirect the anchor to some other
924    place:
925    
926       a.cm (bind:(anchor:lib value:/usr/lib/smlnj/a-stuff))
927       b.cm (bind:(anchor:lib value:/usr/lib/smlnj/b-stuff))
928    
929    This hard-wires $lib/aux.cm to /usr/lib/smlnj/a-stuff/aux.cm or
930    /usr/lib/smlnj/b-stuff/aux.cm, respectively.
931    
932    Hard-wiring path names is a bit inflexible (and CM will verbosely warn
933    you when you do so at the time of CM.stabilize).  Therefore, you can
934    also use an anchored path as the value:
935    
936      a.cm (bind:(anchor:lib value:$a-lib))
937      b.cm (bind:(anchor:lib value:$b-lib))
938    
939    Now you can globally configure (using the usual CM.Anchor.anchor or
940    pathconfig machinery) bindings for "a-lib" and "b-lib".  Since "lib"
941    itself is always locally bound, setting it globally is no longer
942    meaningful or necessary (but it does not hurt either).  In fact, "lib"
943    can still be used as a global anchor for separate purposes.  As a
944    matter of fact, one can locally define "lib" in terms of a global
945    "lib":
946    
947      a.cm (bind:(anchor:lib value:$lib/a))
948      b.cm (bind:(anchor:lib value:$lib/b))
949    
950    ** 3: The encoding of path names has changed.  This affects the way
951    path names are shown in CM's progress report and also the internal
952    protocol encoding used for parallel make.
953    
954    The encoding now uses one or more ':'-separated segments.  Each
955    segments corresponds to a file that has been specified relative to the
956    file given by its preceding segment.  The first segment is either
957    relative to the CWD, absolute, or anchored.  Each segment itself is
958    basically a Unix pathname; all segments but the first are relative.
959    
960    Example:
961    
962       $foo/bar/baz.cm:a/b/c.sml
963    
964    This path denotes the file bar/a/b/c.sml relative to the directory
965    denoted by anchor "foo".  Notice that the encoding also includes
966    baz.cm which is the .cm-file that listed a/b/c.sml.  As usual, such
967    paths are resolved relative to the .cm-files directory, so baz.cm must
968    be ignored to get the "real" pathname.
969    
970    To make this fact more obvious, CM puts the names of such "virtual
971    arcs" into parentheses when they appear in progress reports. (No
972    parentheses will appear in the internal protocol encoding.)  Thus,
973    what you really see is:
974    
975      $foo/bar/(baz.cm):a/b/c.sml
976    
977    I find this notation to be much more informative than before.
978    
979    Another new feature of the encoding is that special characters
980    including parentheses, colons, (back)slashes, and white space are
981    written as \ddd (where ddd is the decimal encoding of the character).
982    
983    *** The CM manual still needs to be updated.
984    
985    ----------------------------------------------------------------------
986    Name: Allen Leung
987    Date: 2000/06/15 00:38:00
988    Tag: leunga-20000615-x86-peephole
989    
990    x86 Peephole fix by Fermin.  Affects c-- and moby only.
991    
992    ----------------------------------------------------------------------
993    Name: Matthias Blume
994    Date: 2000/06/12 11:40:00
995    Tag: blume-20000612-parmakefix
996    Description:
997    
998    More cleanup after changing the file naming scheme: This time I
999    repaired the parallel make mechanism for CMB.make which I broke earlier.
1000    
1001    ----------------------------------------------------------------------
1002    Name: Allen Leung
1003    Date: 2000/06/09 01:25:00
1004    Tag: leunga-20000609-various
1005    
1006    None of these things should affect normal SML/NJ operations
1007    
1008    1. Peephole improvements provided by Fermin (c--)
1009    2. New annotation DEFUSE for adding extra dependence (moby)
1010    3. New X86 LOCK instructions (moby)
1011    4. New machine description language for reservation tables (scheduling)
1012    5. Fixes to various optimization/analysis modules (branch chaining, dominator
1013       trees etc.)
1014    6. I've changed the CM files so that they can work with versions
1015       110.0.6, 110.25 and 110.28
1016    
1017    ----------------------------------------------------------------------
1018    Name: Matthias Blume
1019    Date: 2000/06/09 12:40:00
1020    Tag: blume-20000609-log
1021    Description:
1022    
1023    - Removed all(?) remaining RCS Log entries from sources.
1024    
1025    - Fixed bug in ml-yacc and ml-lex sources (use explicit anchors for
1026      anchored paths).
1027    
1028    ----------------------------------------------------------------------
1029    Name: Matthias Blume
1030    Date: 2000/06/07 17:00:00 JST
1031    Tag: blume-20000607-no-implicit-anchors
1032    Description:
1033    
1034    1. This update changes the default setting for
1035    CM.Control.implicit_anchors from true to false.  This means that
1036    implicit anchors are no longer permitted by default.  I also tried to
1037    make sure that nothing else still relies on implicit anchors.
1038    (This is the next step on the schedule towards a CM that does not even
1039    have the notion of implicit anchors anymore.)
1040    
1041    2. More CM manual updates.
1042    
1043    3. I managed to track down and fix the pickling bug I mentioned last
1044    time.  Because of the previously existing workaround, this entails no
1045    immediate practical changes.
1046    
1047    ----------------------------------------------------------------------
1048    Name: Matthias Blume
1049    Date: 2000/06/06 11:15:00 JST
1050    Tag: blume-20000606-lazierpickle
1051    Description:
1052    
1053    !!!! NEW BOOT FILES !!!!
1054    
1055    * The main purpose of this update is to make library pickles lazier in
1056    order to reduce the initial space penalty for autoloading a library.
1057    As a result, it is now possible to have $smlnj/compiler.cm
1058    pre-registered.  This should take care of the many complaints or
1059    inquiries about missing structure Compiler.  This required changes to
1060    CM's internal data structures and small tweaks to some algorithms.
1061    
1062    As a neat additional effect, it is no longer necessary (for the sake
1063    of lean heap image files) to distinguish between a "minimal" CM and a
1064    "full" CM.  Now, there is only one CM (i.e., the "full" version:
1065    $smlnj/cm.cm aka $smlnj/cm/full.cm), and it is always available at the
1066    interactive top level. ($smlnj/cm/minimal.cm is gone.)
1067    
1068    To make the life of compiler-hackers easier, "makeml" now also
1069    pre-registers $smlnj/cmb.cm (aka $smlnj/cmb/current.cm).  In other
1070    words, after you bootstrap a new sml for the first time, you will not
1071    have to autoload $smlnj/cmb.cm again afterwards.  (The first time
1072    around you will still have to do it, though.)
1073    
1074    * A second change consists of major updates to the CM manual.  There
1075    are now several appendices with summary information and also a full
1076    specification of the CM description file syntax.
1077    
1078    * In directory src/system I added the script "allcross".  This script
1079    invokes sml and cross-compiles the compiler for all supported
1080    architectures.  (Useful when providing a new set of boot files.)
1081    
1082    * There seems to be a latent bug in my "lazy pickles" mechanism.  I
1083    added a small tweak to pickle-util.sml to work around this problem,
1084    but it is not a proper fix yet.  I will investigate further.  (The
1085    effect of the bug was an inflation of library pickle size.)
1086    
1087    * Version number increased to 110.28.1 (to avoid compatibility problems).
1088    
1089    ----------------------------------------------------------------------
1090    Name: Allen Leung
1091    Date: 2000/05/25 17:28 EDT
1092    Tag: leunga-20000525-ra
1093    Description:
1094    
1095      Fixed a bug in freezing phase of the register allocator.
1096    
1097    ----------------------------------------------------------------------
1098    Name: Allen Leung
1099    Date: 2000/05/15 22:53 EDT
1100    Tag: leunga-20000515-alpha-x86-ra
1101    Description:
1102    
1103      1. Alpha
1104    
1105          Slight cleanup.  Removed the instruction SGNXL
1106    
1107      2. X86
1108    
1109          Added the following instructions to the instruction set:
1110    
1111            ROLx, RORx,
1112            BTx, BTSx, BTLx, BTRx,
1113            XCHGx, and variants with the LOCK prefix
1114    
1115      3. Register Allocation
1116    
1117          The module ra-rewrite-with-renaming has been improved.
1118    
1119      These have no effect on SML/NJ.
1120    
1121    ----------------------------------------------------------------------
1122    Name: Matthias Blume
1123    Date: 2000/05/15 16:20:00 JST
1124    Tag: blume-20000515-lightrebuild
1125    Description:
1126    
1127    1. I added an alternative to "-rebuild" to "makeml".  The difference is
1128       that prior to calling CMB.make' the CM-variable "LIGHT" will be
1129       defined.  In effect, the command will not build any cross-compiler
1130       backends and therefore finish more quickly.
1131    
1132       The "fixpt" script also takes a "-light" switch to be able to use
1133       this new facility while compiling for a fixpoint.
1134    
1135    2. I replaced all mentions of anchored paths in group owner specifications
1136       with simple relative paths (usually starting with "..").
1137       The rationale is that a library's internal workings should not be
1138       compromised by the lack of some anchor.  (An anchor is necessary
1139       for someone who wants to refer to the library by an anchored path,
1140       but it should not be necessary to build the same library in the first
1141       place.)
1142    
1143    3. I changed the way CM's tool mechanism determines the shell command
1144       string used for things like ml-yacc etc. so that it does not break
1145       when CM.Control.implicit_anchors is turned off.
1146    
1147    ----------------------------------------------------------------------
1148    Name: Matthias Blume
1149    Date: 2000/05/12 18:20:00 JST
1150    Tag: blume-20000512-ml-build
1151    Description:
1152    
1153    Fixed a bug in config/_ml-build that prevented ml-yacc and ml-lex from
1154    getting installed properly (by config/install.sh).
1155    
1156    ----------------------------------------------------------------------
1157    Name: Matthias Blume
1158  Date: 2000/05/12 17:30:00 JST  Date: 2000/05/12 17:30:00 JST
1159  Tag: blume-20000512-anchors  Tag: blume-20000512-anchors
1160  Description:  Description:
# Line 435  Line 1577 
1577    
1578  3.  Assembly  3.  Assembly
1579    
1580      When generating assemby, resolve the value of client defined constants,      When generating assembly, resolve the value of client defined constants,
1581      instead of generating symbolic values.  This is controlled by the      instead of generating symbolic values.  This is controlled by the
1582      new flag "asm-resolve-constants", which is default to true.      new flag "asm-resolve-constants", which is default to true.
1583    
# Line 458  Line 1600 
1600    
1601  To this end, I arranged that instead of "structure Core" as "structure  To this end, I arranged that instead of "structure Core" as "structure
1602  _Core" is bound in the pervasive environment.  Core access is done via  _Core" is bound in the pervasive environment.  Core access is done via
1603  _Core (which can never be accidentially rebound because _Core is not a  _Core (which can never be accidentally rebound because _Core is not a
1604  legal surface-syntax symbol).  legal surface-syntax symbol).
1605    
1606  The current solution is much cleaner because the core environment is  The current solution is much cleaner because the core environment is
# Line 468  Line 1610 
1610  with dynamic and symbolic parts of the core environment.  with dynamic and symbolic parts of the core environment.
1611    
1612  Remaining hackery (to bind the "magic" symbol _Core) is localized in the  Remaining hackery (to bind the "magic" symbol _Core) is localized in the
1613  compilation mananger's bootstrap compiler (actually: in the "init group"  compilation manager's bootstrap compiler (actually: in the "init group"
1614  handling).  See the comments in src/system/smlnj/init/init.cmi for  handling).  See the comments in src/system/smlnj/init/init.cmi for
1615  more details.  more details.
1616    
# Line 583  Line 1725 
1725     (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
1726     used).     used).
1727    
1728     This was done to accomodate the new "make" and "shell" tools which     This was done to accommodate the new "make" and "shell" tools which
1729     facilitate fairly seemless hookup to portions of code managed using     facilitate fairly seamless hookup to portions of code managed using
1730     Makefiles or Shell scripts.     Makefiles or Shell scripts.
1731    
1732     There are no classes "shared" or "private" anymore.  Instead, the     There are no classes "shared" or "private" anymore.  Instead, the
# Line 596  Line 1738 
1738    
1739     All existing tools are described in the CM manual.     All existing tools are described in the CM manual.
1740    
1741     - Slightly better error handling.  (CM now surpresses many followup     - Slightly better error handling.  (CM now suppresses many followup
1742     error messages that tended to be more annoying than helpful.)     error messages that tended to be more annoying than helpful.)
1743    
1744  2. Major changes to the compiler's static environment data structures.  2. Major changes to the compiler's static environment data structures.
# Line 730  Line 1872 
1872    
1873       I've changed andl to testl in the floating point test sequence       I've changed andl to testl in the floating point test sequence
1874       whenever appropriate.  The Intel optimization guide states that       whenever appropriate.  The Intel optimization guide states that
1875       testl is perferable to andl.       testl is preferable to andl.
1876    
1877  7. RA (x86 only)  7. RA (x86 only)
1878    
# Line 912  Line 2054 
2054    
2055  1. Tools.registerStdShellCmdTool (from smlnj/cm/tool.cm) takes an  1. Tools.registerStdShellCmdTool (from smlnj/cm/tool.cm) takes an
2056  additional argument called "template" which is an optional string that  additional argument called "template" which is an optional string that
2057  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
2058  explanation.  explanation.
2059    
2060  2. A special-purpose tool can be "regisitered" by simply dropping the  2. A special-purpose tool can be "registered" by simply dropping the
2061  corresponding <...>-tool.cm (and/or <...>-ext.cm) into the same  corresponding <...>-tool.cm (and/or <...>-ext.cm) into the same
2062  directory where the .cm file lives that uses this tool.  (The  directory where the .cm file lives that uses this tool.  (The
2063  behavior/misfeature until now was to look for the tool description  behavior/misfeature until now was to look for the tool description
# Line 959  Line 2101 
2101  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
2102  <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,
2103  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
2104  perhaps got accidentially killed).  In this case, fixpt will quickly  perhaps got accidentally killed).  In this case, fixpt will quickly
2105  move through what exists before continuing where it left off earlier,  move through what exists before continuing where it left off earlier,
2106  and, thus, saves a lot of time.  and, thus, saves a lot of time.
2107    
# Line 1009  Line 2151 
2151    it from that remote directory.    it from that remote directory.
2152    This should simplify installation further:  For machines that have    This should simplify installation further:  For machines that have
2153    access to the internet, just fetch <version>-config.tgz, unpack it,    access to the internet, just fetch <version>-config.tgz, unpack it,
2154    edit config/targets, and go (run config/install.sh).  The scipt will    edit config/targets, and go (run config/install.sh).  The script will
2155    fetch everything else that it might need all by itself.    fetch everything else that it might need all by itself.
2156    
2157    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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