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revision 602, Thu Apr 6 05:31:24 2000 UTC revision 692, Thu Jul 27 08:34:53 2000 UTC
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12  Tag: <post-commit CVS tag>  Tag: <post-commit CVS tag>
13  Description:  Description:
14  ----------------------------------------------------------------------  ----------------------------------------------------------------------
15    Name: Matthias Blume
16    Date: 2000/07/27 17:40:00 JST
17    Tag: blume-20000727-scripts
18    Description:
19    
20    !!!! WARNING !!!!
21    You must recompile the runtime system!
22    !!!! WARNING !!!!
23    
24    This is basically another round of script-enhancements:
25    
26    1. sml, ml-build, and ml-makedepend accept options -D and -U to define
27       and undefine CM preprocessor symbols.
28    
29    2. ml-build avoids generating a new heap image if it finds that the
30       existing one is still ok.  (The condition is that no ML file had to
31       be recompiled and all ML files are found to be older that the heap
32       file.)
33    
34       To make this work smoothly, I also hacked the runtime system as
35       well as SMLofNJ.SysInfo to get access to the heap image suffix
36       (.sparc-solaris, ...) that is currently being used.
37    
38       Moreover, the signature of CM.mk_standalone has changed.  See the
39       CM manual.
40    
41    3. ml-makedepend accepts additional options -n, -a, and -o.  (See the
42       CM manual for details.)
43    
44    4. More CM manual updates:
45        - all of the above has been documented.
46        - there is now a section describing the (CM-related) command line
47          arguments that are accepted by the "sml" command
48    
49    ----------------------------------------------------------------------
50    Name: Matthias Blume
51    Date: 2000/07/25 16:20:00 JST
52    Tag: blume-20000725-makedepend
53    Description:
54    
55    Added a script called ml-makedepend.  This can be used in makefiles
56    for Unix' make in a way very similar to the "makedepend" command for
57    C.
58    
59    The script internally uses function CM.sources.
60    
61    Synopsis:
62    
63        ml-makedepend [-f makefile] cmfile targetname
64    
65    The default for the makefile is "makefile" (or "Makefile" should
66    "makefile" not exist).
67    
68    ml-makedepend adds a cmfile/targetname-specific section to this
69    makefile (after removing the previous version of this section).  The
70    section contains a single dependency specification with targetname on
71    the LHS (targetname is an arbitrary name), and a list of files derived
72    from the cmfile on the RHS.  Some of the files on the RHS are
73    ARCH/OPSYS-specific.  Therefore, ml-makedepend inserts references to
74    "make" variables $(ARCH) and $(OPSYS) in place of the corresponding
75    path names.  The makefile writer is responsible for making sure that
76    these variables have correct at the time "make" is invoked.
77    
78    ----------------------------------------------------------------------
79    Name: Matthias Blume
80    Date: 2000/07/22 23:30:00 JST
81    Tag: blume-20000722-urlupdate
82    Description:
83    
84    Changed BOOT and config/srcarchiveurl to point to BL server:
85    
86        ftp://ftp.research.bell-labs.com/dist/smlnj/working/110.29/
87    
88    ----------------------------------------------------------------------
89    Name: Matthias Blume
90    Date: 2000/07/18 18:00:00 JST
91    Tag: blume-20000718-Version_110_29
92    Description:
93    
94    1. Updated src/compiler/TopLevel/main/version.sml to version 110.29
95    
96    2. Updated config/version to 110.29
97    
98    3. Updated config/srcarchiveurl
99    
100    3. New boot files!
101       ftp://ftp.cs.princeton.edu/pub/people/blume/sml/110.29-autofetch
102    
103    ----------------------------------------------------------------------
104    Name: Matthias Blume
105    Date: 2000/07/11 13:58:00 JST
106    Tag: blume-20000711-doctypo
107    Description:
108    
109    Fixed a few typos in CM manual.
110    
111    ----------------------------------------------------------------------
112    Name: Allen Leung
113    Date: 2000/06/15 00:38:00
114    Tag: leunga-20000704-sparc-x86
115    
116    1. x86 peephole improvement sp += k; sp -= k => nop  [from John]
117    2. fix to x86 RET bug [found by Dan Grossman]
118    3. sparc assembly bug fix for ticc instructions [found by Fermin]
119    
120       Affects c-- and moby only
121    
122    ----------------------------------------------------------------------
123    Name: Matthias Blume
124    Date: 2000/07/04 15:26:00
125    Tag: blume-20000704-trigger
126    Description:
127    
128    1. Improvements to CM manual.
129    2. SMLofNJ.Internals.BTrace.trigger reinstated as an alternative way
130       of getting a back-trace.  The function, when called, raises an
131       internal exception which explicitly carries the full back-trace history,
132       so it is unaffected by any intervening handle-raise pairs ("trivial"
133       or not).  The interactive loop will print that history once it arrives
134       at top level.
135       Short of having all exceptions implicitly carry the full history, the
136       recommended way of using this facility is:
137         - compile your program with instrumentation "on"
138         - run it, when it raises an exception, look at the history
139         - if the history is "cut off" because of some handler, go and modify
140           your program so that it explicitly calls BTrace.trigger
141         - recompile (still instrumented), and rerun; look at the full history
142    
143    ----------------------------------------------------------------------
144    Name: Matthias Blume
145    Date: 2000/07/03 15:36:00 JST
146    Tag: blume-20000702-manual
147    Description:
148    
149    Small corrections and updates to CM manual.
150    
151    ----------------------------------------------------------------------
152    Name: Matthias Blume
153    Date: 2000/06/29 16:04:00 JST
154    Tag: blume-20000629-yacctool
155    Description:
156    
157    Changes:
158    
159    1. Class "mlyacc" now takes separate arguments to pass options to
160       generated .sml- and .sig-files independently.
161    2. Corresponding CM manual updates.
162    3. BTrace module now also reports call sites.  (However, for loop clusters
163       it only shows from where the cluster was entered.)  There are associated
164       modifications to core.sml, internals.{sig,sml}, btrace.sml, and btimp.sml.
165    
166    ----------------------------------------------------------------------
167    Name: Matthias Blume
168    Date: 2000/06/27 16:51:00 JST
169    Tag: blume-20000627-noweb
170    Description:
171    
172    Changes:
173    
174     1. Implemented "subdir" and "witness" options for noweb tool.
175        This caused some slight internal changes in CM's tool implementation.
176     2. Fixed bug in "tool plugin" mechanism.  This is essentially cleaning
177        some remaining issues from earlier path anchor changes.
178     3. Updated CM manual accordingly.
179    
180     4. Changed implementation of back-tracing so that I now consider it
181        ready for prime-time.
182    
183        In particular, you don't have to explicitly trigger the back-trace
184        anymore.  Instead, if you are running BTrace-instrumented code and
185        there is an uncaught exception (regardless of whether or not it was
186        raised in instrumented code), the top-level evalloop will print
187        the back-trace.
188    
189        Features:
190    
191          - Instrumented and uninstrumented code work together seemlessly.
192            (Of course, uninstrumented code is never mentioned in actual
193             back-traces.)
194    
195          - Asymptotic time- and space-complexity of instrumented code is
196            equal to that of uninstrumented code.  (This means that
197            tail-recursion is preserved by the instrumentation phase.)
198    
199          - Modules whose code has been instrumented in different sessions
200            work together without problem.
201    
202          - There is no penalty whatsoever on uninstrumented code.
203    
204          - There is no penalty on "raise" expressions, even in
205            instrumented code.
206    
207        A potential bug (or perhaps it is a feature, too):
208    
209          A back-trace reaches no further than the outermost instrumented
210          non-trivial "raise".  Here, a "trivial" raise is one that is the
211          sole RHS of a "handle" rule.  Thus, back-traces reach trough
212    
213               <exp> handle e => raise e
214    
215          and even
216    
217               <exp> handle Foo => raise Bar
218    
219          and, of course, through
220    
221               <exp> handle Foo => ...
222    
223         if the exception was not Foo.
224    
225         Back-traces always reach right through any un-instrumented code
226         including any of its "handle" expressions, trivial or not.
227    
228       To try this out, do the following:
229    
230         - Erase all existing binfiles for your program.
231           (You may keep binfiles for those modules where you think you
232            definitely don't need back-tracing.)
233         - Turn on back-trace instrumentation:
234              SMLofNJ.Internals.BTrace.mode (SOME true);
235         - Recompile your program.  (I.e., run "CM.make" or "use".)
236         - You may now turn instrumentation off again (if you want):
237              SMLofNJ.Internals.BTrace.mode (SOME false);
238         - Run your program as usual.  If it raises an exception that
239           reaches the interactive toplevel, then a back-trace will
240           automatically be printed.  After that, the toplevel loop
241           will print the exception history as usual.
242    
243    ----------------------------------------------------------------------
244    Name: Matthias Blume
245    Date: 2000/06/26 09:56:46 JST
246    Tag: blume-20000626-setup
247    Description:
248    
249    CM: - setup-parameter to "sml" added; this can be used to run arbitrary
250          ML code before and after compiling a file (e.g., to set compiler
251          flags)
252    
253    Compiler: - improved btrace API (in core.sml, internals.{sig,sml})
254              - associated changes to btrace.sml (BTrace instrumentation pass)
255              - cleaner implementation of btimp.sml (BTrace tracing and report
256                module)
257    
258    CM manual: * new path encoding documented
259               * description of setup-parameter to "sml" added
260    
261    The biggest user-visible change to back-tracing is that it is no
262    longer necessary to compile all traced modules within the same
263    session.  (This was a real limitation.)
264    
265    ----------------------------------------------------------------------
266    Name: Matthias Blume
267    Date: 2000/06/24 12:40:00 JST
268    Tag: blume-20000624-startup
269    Description:
270    
271    Fixes startup slowdown problem.  (I was calling SrcPath.sync a _tad_
272    bit too often -- to put it mildly. :)
273    
274    ----------------------------------------------------------------------
275    Name: Matthias Blume
276    Date: 2000/06/23 18:20:00 JST
277    Tag: blume-20000623-btrace
278    Description:
279    
280    This updates adds a backtrace facility to aid programmers in debugging
281    their programs.  This involves the following changes:
282    
283    1. Module system/smlnj/init/core.sml (structure _Core) now has hooks for
284       keeping track of the current call stack.  When programs are compiled
285       in a special mode, the compiler will insert calls to these hooks
286       into the user program.
287       "Hook" means that it is possible for different implementations of
288       back-tracing to register themselves (at different times).
289    
290    2. compiler/MiscUtil/profile/btrace.sml implements the annotation phase
291       as an Absyn.dec->Absyn.dec rewrite.  Normally this phase is turned off.
292       It can be turned on using this call:
293         SMLofNJ.Internals.BTrace.mode (SOME true);
294       Turning it off again:
295         SMLofNJ.Internals.BTrace.mode (SOME false);
296       Querying the current status:
297         SMLofNJ.Internals.BTrace.mode NONE;
298       Annotated programs are about twice as big as normal ones, and they
299       run a factor of 2 to 4 slower with a dummy back-trace plugin (one
300       where all hooks do nothing).  The slowdown with a plugin that is
301       actually useful (such as the one supplied by default) is even greater,
302       but in the case of the default plugin it is still only an constant
303       factor (amortized).
304    
305    3. system/Basis/Implementation/NJ/internals.{sig,sml} have been augmented
306       with a sub-structure BTrace for controlling back-tracing.  In particular,
307       the above-mentioned function "mode" controls whether the annotation
308       phase is invoked by the compiler.  Another important function is
309       "trigger": when called it aborts the current execution and causes
310       the top-level loop to print a full back-trace.
311    
312    4. compiler/MiscUtil/profile/btimp.sml is the current default plugin
313       for back-tracing.  It keeps track of the dynamic call stack and in
314       addition to that it keeps a partial history at each "level" of that
315       stack.  For example, if a tail-calls b, b tail-calls c, and c tail-calls
316       d and b (at separate times, dynamically), then the report will show:
317    
318       GOTO   d
319             /c
320       GOTO  \b
321       CALL   a
322    
323       This shows that there was an initial non-tail call of a, then a
324       tail-call to b or c, looping behavior in a cluster of functions that
325       consist of b and c, and then a goto from that cluster (i.e., either from
326       b or from c) to d.
327    
328       Note that (depending on the user program) the amount of information
329       that the back-trace module has to keep track of at each level is bounded
330       by a constant.  Thus, the whole implementation has the same asymptotical
331       complexity as the original program (both in space and in time).
332    
333    5. compiler/TopLevel/interact/evalloop.sml has been modified to
334       handle the special exception SMLofNJ.Internals.BTrace.BTrace
335       which is raised by the "trigger" function mentioned above.
336    
337    Notes on usage:
338    
339    - Annotated code works well together with unannotated code:
340    Unannotated calls simply do not show up at all in the backtrace.
341    
342    - It is not a good idea to let modules that were annotated during
343    different sessions run at the same time.  This is because the compiler
344    chooses small integers to identify individual functions, and there
345    will be clashes if different modules were compiled in separate sessions.
346    (Nothing will crash, and you will even be told about the clashes, but
347    back-trace information will in general not be useful.)
348    
349    - Back-tracing can be confused by callcc and capture.
350    
351    - The only way of getting a back-trace right now is to explicitly
352    invoke the "trigger" function from your user program.  Eventually, we
353    should make every exception carry back-trace information (if
354    available).  But since this creates more overhead at "raise"-time
355    (similar to the current exnHistory overhead), I have not yet
356    implemented this.  (The implementation will be rather easy.)  With
357    exceptions carrying back-trace information, this facility will be even
358    more useful because users don't need to modify their programs...
359    
360    - While it is possible to compile the compiler with back-trace
361    annotations turned on (I did it to get some confidence in
362    correctness), you must make absolutely sure that core.sml and
363    btimp.sml are compiled WITHOUT annotation!  (core.sml cannot actually
364    be compiled with annotation because there is no core access yet, but
365    if you compile btimp.sml with annotation, then the system will go into
366    an infinite recursion and crash.)
367    Since CM currently does not know about BTrace, the only way to turn
368    annotations on and off for different modules of the compiler is to
369    interrupt CMB.make, change the settings, and re-invoke it.  Of course,
370    this is awkward and clumsy.
371    
372    Sample sessions:
373    
374    Standard ML of New Jersey v110.28.1 [FLINT v1.5], June 5, 2000
375    - SMLofNJ.Internals.BTrace.mode (SOME true);
376    [autoloading]
377    [autoloading done]
378    val it = false : bool
379    - structure X = struct
380    -     fun main n = let
381    -         fun a (x, 0) = d x
382    -           | a (x, n) = b (x, n - 1)
383    -         and b (x, n) = c (x, n)
384    -         and c (x, n) = a (x, n)
385    -         and d x = e (x, 3)
386    -         and e (x, 0) = f x
387    -           | e (x, n) = e (x, n - 1)
388    -         and f 0 = SMLofNJ.Internals.BTrace.trigger ()
389    -           | f n = n * g (n - 1)
390    -         and g n = a (n, 3)
391    -     in
392    -         f n
393    -     end
394    - end;
395    structure X : sig val main : int -> int end
396    - X.main 3;
397    *** BACK-TRACE ***
398    GOTO   stdIn:4.2-13.20: X.main[2].f
399    GOTO-( stdIn:4.2-13.20: X.main[2].e
400    GOTO   stdIn:4.2-13.20: X.main[2].d
401         / stdIn:4.2-13.20: X.main[2].a
402         | stdIn:4.2-13.20: X.main[2].b
403    GOTO-\ stdIn:4.2-13.20: X.main[2].c
404    CALL   stdIn:4.2-13.20: X.main[2].g
405    GOTO   stdIn:4.2-13.20: X.main[2].f
406    GOTO-( stdIn:4.2-13.20: X.main[2].e
407    GOTO   stdIn:4.2-13.20: X.main[2].d
408         / stdIn:4.2-13.20: X.main[2].a
409         | stdIn:4.2-13.20: X.main[2].b
410    GOTO-\ stdIn:4.2-13.20: X.main[2].c
411    CALL   stdIn:4.2-13.20: X.main[2].g
412    GOTO   stdIn:4.2-13.20: X.main[2].f
413    GOTO-( stdIn:4.2-13.20: X.main[2].e
414    GOTO   stdIn:4.2-13.20: X.main[2].d
415         / stdIn:4.2-13.20: X.main[2].a
416         | stdIn:4.2-13.20: X.main[2].b
417    GOTO-\ stdIn:4.2-13.20: X.main[2].c
418    CALL   stdIn:4.2-13.20: X.main[2].g
419    GOTO   stdIn:4.2-13.20: X.main[2].f
420    CALL   stdIn:2.15-17.4: X.main[2]
421    -
422    
423    (Note that because of a FLINt bug the above code currently does not
424    compile without BTrace turned on.)
425    
426    Here is another example, using my modified Tiger compiler:
427    
428    Standard ML of New Jersey v110.28.1 [FLINT v1.5], June 5, 2000
429    - SMLofNJ.Internals.BTrace.mode (SOME true);
430    [autoloading]
431    [autoloading done]
432    val it = false : bool
433    - CM.make "sources.cm";
434    [autoloading]
435    ...
436    [autoloading done]
437    [scanning sources.cm]
438    [parsing (sources.cm):parse.sml]
439    [creating directory CM/SKEL ...]
440    [parsing (sources.cm):tiger.lex.sml]
441    ...
442    [wrote CM/sparc-unix/semant.sml]
443    [compiling (sources.cm):main.sml]
444    [wrote CM/sparc-unix/main.sml]
445    [New bindings added.]
446    val it = true : bool
447    - Main.compile ("../testcases/merge.tig", "foo.out");
448    *** BACK-TRACE ***
449    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trvar
450    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
451    CALL   lib/semant.sml:289.3-295.22: SemantFun[2].transExp.trexp.check[2]
452    GOTO   lib/semant.sml:289.3-295.22: SemantFun[2].transExp.trexp.check[2]
453    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
454    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
455    CALL   lib/semant.sml:488.3-505.6: SemantFun[2].transDec.trdec[2].transBody[2]
456         / lib/semant.sml:411.65-543.8: SemantFun[2].transDec
457    CALL-\ lib/semant.sml:413.2-540.9: SemantFun[2].transDec.trdec[2]
458    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
459    CALL   lib/semant.sml:8.52-558.4: SemantFun[2].transProg[2]
460    CALL   main.sml:1.18-118.4: Main.compile[2]
461    -
462    
463    ----------------------------------------------------------------------
464    Name: Matthias Blumen
465    Date: 2000/06/21 18:00:00 JST
466    Tag: blume-20000621-manual
467    Description:
468    
469    CM manual update: Path environments documented.
470    
471    ----------------------------------------------------------------------
472    Name: Matthias Blume
473    Date: 2000/06/19 13:40:00
474    Tag: blume-20000619-manual
475    Description:
476    
477    CM manual and system/README update.  This only covers the fact that
478    there are no more implicit anchors.  (Path environments and the "bind"
479    option to "cm" have yet to be documented.)
480    
481    ----------------------------------------------------------------------
482    Name: Matthias Blume
483    Date: 2000/06/19 11:05:00 JST
484    Tag: blume-20000619-chdir-bugfix
485    Description:
486    
487    Fixed a bug in new SrcPath module that sometimes led to a bad chDir call.
488    
489    ----------------------------------------------------------------------
490    Name: Matthias Blume
491    Date: 2000/06/18 22:00:10 JST
492    Tag: blume-20000618-implicit-anchors-really-gone
493    Description:
494    
495    I updates the previous HISTORY entry where I forgot to mention that
496    implicit anchors are no longer with us.
497    
498    The current update also gets rid of the (now useless) controller
499    CM.Control.implicit_anchors.
500    
501    ----------------------------------------------------------------------
502    Name: Matthias Blume
503    Date: 2000/06/16 17:30:00 JST
504    Tag: blume-20000616-anchorenv
505    Description:
506    
507    This patch implements the long anticipated (just kidding :) "anchor
508    environment" mechanism.  In the course of doing this, I also
509    re-implemented CM's internal "SrcPath" module from scratch.  The new
510    one should be more robust in certain boundary cases.  In any case, it
511    is a lot cleaner than its predecessor (IMHO).
512    
513    This time, although there is yet another boot file format change, I
514    kept the unpickler backward-compatible.  As a result, no new bootfiles
515    are necessary and bootstrapping is straightforward.  (You cannot read
516    new bootfiles into an old system, but the other way around is no
517    problem.)
518    
519    Visible changes:
520    
521    ** 0. Implicit path anchors (without the leading $-symbol) are no
522    longer recognized at all. This means that such path names are not
523    illegal either.  For example, the name basis.cm simply refers to a
524    local file called "basis.cm" (i.e, the name is an ordinary path
525    relative to .cm-files directory).  Or, to put it differently, only
526    names that start with $ are anchored paths.
527    
528    ** 1. The $<singlearc> abbreviation for $/<singlearc> has finally
529    vanished.
530    
531    John (Reppy) had critizised this as soon as I originally proposed and
532    implemented it, but at that time I did not really deeply believe
533    him. :) Now I came full-circle because I need the $<singlearc> syntax
534    in another place where it cannot be seen as an abbreviation for
535    $/<singlearc>.  To avoid the confusion, $<singlearc> now means what it
536    seems to mean (i.e., it "expands" into the corresponding anchor
537    value).
538    
539    However, when paths are used as members in CM description files, it
540    continues to be true that there must be at least another arc after the
541    anchor.  This is now enforced separately during semantic analysis
542    (i.e., from a lexical/syntactical point of view, the notation is ok.)
543    
544    ** 2. The "cm" class now accepts an option "bind".  The option's value
545    is a sub-option list of precisely two items -- one labeled "anchor"
546    and the other one labeled "value".  As you might expect, "anchor" is
547    used to specify an anchor name to be bound, and "value" specifies what
548    the anchor is being bound to.
549    
550    The value must be a directory name and can be given in either standard
551    syntax (including the possibility that it is itself an anchored path)
552    or native syntax.
553    
554    Examples:
555    
556       foo.cm (bind:(anchor:bar value:$mystuff/bar))
557       lib.cm (bind:(anchor:a value:"H:\\x\\y\\z"))  (* only works under windows *)
558    
559    and so on.
560    
561    The meaning of this is that the .cm-file will be processed with an
562    augmented anchor environment where the given anchor(s) is/are bound to
563    the given values(s).
564    
565    The rationale for having this feature is this: Suppose you are trying
566    to use two different (already stable) libraries a.cm and b.cm (that
567    you perhaps didn't write yourself).  Further, suppose each of these
568    two libraries internally uses its own auxiliary library $aux/lib.cm.
569    Normally you would now have a problem because the anchor "lib" can not
570    be bound to more than one value globally.  Therefore, the project that
571    uses both a.cm and b.cm must locally redirect the anchor to some other
572    place:
573    
574       a.cm (bind:(anchor:lib value:/usr/lib/smlnj/a-stuff))
575       b.cm (bind:(anchor:lib value:/usr/lib/smlnj/b-stuff))
576    
577    This hard-wires $lib/aux.cm to /usr/lib/smlnj/a-stuff/aux.cm or
578    /usr/lib/smlnj/b-stuff/aux.cm, respectively.
579    
580    Hard-wiring path names is a bit inflexible (and CM will verbosely warn
581    you when you do so at the time of CM.stabilize).  Therefore, you can
582    also use an anchored path as the value:
583    
584      a.cm (bind:(anchor:lib value:$a-lib))
585      b.cm (bind:(anchor:lib value:$b-lib))
586    
587    Now you can globally configure (using the usual CM.Anchor.anchor or
588    pathconfig machinery) bindings for "a-lib" and "b-lib".  Since "lib"
589    itself is always locally bound, setting it globally is no longer
590    meaningful or necessary (but it does not hurt either).  In fact, "lib"
591    can still be used as a global anchor for separate purposes.  As a
592    matter of fact, one can locally define "lib" in terms of a global
593    "lib":
594    
595      a.cm (bind:(anchor:lib value:$lib/a))
596      b.cm (bind:(anchor:lib value:$lib/b))
597    
598    ** 3: The encoding of path names has changed.  This affects the way
599    path names are shown in CM's progress report and also the internal
600    protocol encoding used for parallel make.
601    
602    The encoding now uses one or more ':'-separated segments.  Each
603    segments corresponds to a file that has been specified relative to the
604    file given by its preceding segment.  The first segment is either
605    relative to the CWD, absolute, or anchored.  Each segment itself is
606    basically a Unix pathname; all segments but the first are relative.
607    
608    Example:
609    
610       $foo/bar/baz.cm:a/b/c.sml
611    
612    This path denotes the file bar/a/b/c.sml relative to the directory
613    denoted by anchor "foo".  Notice that the encoding also includes
614    baz.cm which is the .cm-file that listed a/b/c.sml.  As usual, such
615    paths are resolved relative to the .cm-files directory, so baz.cm must
616    be ignored to get the "real" pathname.
617    
618    To make this fact more obvious, CM puts the names of such "virtual
619    arcs" into parentheses when they appear in progress reports. (No
620    parentheses will appear in the internal protocol encoding.)  Thus,
621    what you really see is:
622    
623      $foo/bar/(baz.cm):a/b/c.sml
624    
625    I find this notation to be much more informative than before.
626    
627    Another new feature of the encoding is that special characters
628    including parentheses, colons, (back)slashes, and white space are
629    written as \ddd (where ddd is the decimal encoding of the character).
630    
631    *** The CM manual still needs to be updated.
632    
633    ----------------------------------------------------------------------
634    Name: Allen Leung
635    Date: 2000/06/15 00:38:00
636    Tag: leunga-20000615-x86-peephole
637    
638    x86 Peephole fix by Fermin.  Affects c-- and moby only.
639    
640    ----------------------------------------------------------------------
641    Name: Matthias Blume
642    Date: 2000/06/12 11:40:00
643    Tag: blume-20000612-parmakefix
644    Description:
645    
646    More cleanup after changing the file naming scheme: This time I
647    repaired the parallel make mechanism for CMB.make which I broke earlier.
648    
649    ----------------------------------------------------------------------
650    Name: Allen Leung
651    Date: 2000/06/09 01:25:00
652    Tag: leunga-20000609-various
653    
654    None of these things should affect normal SML/NJ operations
655    
656    1. Peephole improvements provided by Fermin (c--)
657    2. New annotation DEFUSE for adding extra dependence (moby)
658    3. New X86 LOCK instructions (moby)
659    4. New machine description language for reservation tables (scheduling)
660    5. Fixes to various optimization/analysis modules (branch chaining, dominator
661       trees etc.)
662    6. I've changed the CM files so that they can work with versions
663       110.0.6, 110.25 and 110.28
664    
665    ----------------------------------------------------------------------
666    Name: Matthias Blume
667    Date: 2000/06/09 12:40:00
668    Tag: blume-20000609-log
669    Description:
670    
671    - Removed all(?) remaining RCS Log entries from sources.
672    
673    - Fixed bug in ml-yacc and ml-lex sources (use explicit anchors for
674      anchored paths).
675    
676    ----------------------------------------------------------------------
677    Name: Matthias Blume
678    Date: 2000/06/07 17:00:00 JST
679    Tag: blume-20000607-no-implicit-anchors
680    Description:
681    
682    1. This update changes the default setting for
683    CM.Control.implicit_anchors from true to false.  This means that
684    implicit anchors are no longer permitted by default.  I also tried to
685    make sure that nothing else still relies on implicit anchors.
686    (This is the next step on the schedule towards a CM that does not even
687    have the notion of implicit anchors anymore.)
688    
689    2. More CM manual updates.
690    
691    3. I managed to track down and fix the pickling bug I mentioned last
692    time.  Because of the previously existing workaround, this entails no
693    immediate practical changes.
694    
695    ----------------------------------------------------------------------
696    Name: Matthias Blume
697    Date: 2000/06/06 11:15:00 JST
698    Tag: blume-20000606-lazierpickle
699    Description:
700    
701    !!!! NEW BOOT FILES !!!!
702    
703    * The main purpose of this update is to make library pickles lazier in
704    order to reduce the initial space penalty for autoloading a library.
705    As a result, it is now possible to have $smlnj/compiler.cm
706    pre-registered.  This should take care of the many complaints or
707    inquiries about missing structure Compiler.  This required changes to
708    CM's internal data structures and small tweaks to some algorithms.
709    
710    As a neat additional effect, it is no longer necessary (for the sake
711    of lean heap image files) to distinguish between a "minimal" CM and a
712    "full" CM.  Now, there is only one CM (i.e., the "full" version:
713    $smlnj/cm.cm aka $smlnj/cm/full.cm), and it is always available at the
714    interactive top level. ($smlnj/cm/minimal.cm is gone.)
715    
716    To make the life of compiler-hackers easier, "makeml" now also
717    pre-registers $smlnj/cmb.cm (aka $smlnj/cmb/current.cm).  In other
718    words, after you bootstrap a new sml for the first time, you will not
719    have to autoload $smlnj/cmb.cm again afterwards.  (The first time
720    around you will still have to do it, though.)
721    
722    * A second change consists of major updates to the CM manual.  There
723    are now several appendices with summary information and also a full
724    specification of the CM description file syntax.
725    
726    * In directory src/system I added the script "allcross".  This script
727    invokes sml and cross-compiles the compiler for all supported
728    architectures.  (Useful when providing a new set of boot files.)
729    
730    * There seems to be a latent bug in my "lazy pickles" mechanism.  I
731    added a small tweak to pickle-util.sml to work around this problem,
732    but it is not a proper fix yet.  I will investigate further.  (The
733    effect of the bug was an inflation of library pickle size.)
734    
735    * Version number increased to 110.28.1 (to avoid compatibility problems).
736    
737    ----------------------------------------------------------------------
738    Name: Allen Leung
739    Date: 2000/05/25 17:28 EDT
740    Tag: leunga-20000525-ra
741    Description:
742    
743      Fixed a bug in freezing phase of the register allocator.
744    
745    ----------------------------------------------------------------------
746    Name: Allen Leung
747    Date: 2000/05/15 22:53 EDT
748    Tag: leunga-20000515-alpha-x86-ra
749    Description:
750    
751      1. Alpha
752    
753          Slight cleanup.  Removed the instruction SGNXL
754    
755      2. X86
756    
757          Added the following instructions to the instruction set:
758    
759            ROLx, RORx,
760            BTx, BTSx, BTLx, BTRx,
761            XCHGx, and variants with the LOCK prefix
762    
763      3. Register Allocation
764    
765          The module ra-rewrite-with-renaming has been improved.
766    
767      These have no effect on SML/NJ.
768    
769    ----------------------------------------------------------------------
770    Name: Matthias Blume
771    Date: 2000/05/15 16:20:00 JST
772    Tag: blume-20000515-lightrebuild
773    Description:
774    
775    1. I added an alternative to "-rebuild" to "makeml".  The difference is
776       that prior to calling CMB.make' the CM-variable "LIGHT" will be
777       defined.  In effect, the command will not build any cross-compiler
778       backends and therefore finish more quickly.
779    
780       The "fixpt" script also takes a "-light" switch to be able to use
781       this new facility while compiling for a fixpoint.
782    
783    2. I replaced all mentions of anchored paths in group owner specifications
784       with simple relative paths (usually starting with "..").
785       The rationale is that a library's internal workings should not be
786       compromised by the lack of some anchor.  (An anchor is necessary
787       for someone who wants to refer to the library by an anchored path,
788       but it should not be necessary to build the same library in the first
789       place.)
790    
791    3. I changed the way CM's tool mechanism determines the shell command
792       string used for things like ml-yacc etc. so that it does not break
793       when CM.Control.implicit_anchors is turned off.
794    
795    ----------------------------------------------------------------------
796    Name: Matthias Blume
797    Date: 2000/05/12 18:20:00 JST
798    Tag: blume-20000512-ml-build
799    Description:
800    
801    Fixed a bug in config/_ml-build that prevented ml-yacc and ml-lex from
802    getting installed properly (by config/install.sh).
803    
804    ----------------------------------------------------------------------
805    Name: Matthias Blume
806    Date: 2000/05/12 17:30:00 JST
807    Tag: blume-20000512-anchors
808    Description:
809    
810    !!! NEW BOOT FILES !!!
811    
812    This change is in preparation of fading out support for "implicitly
813    anchored path names".  I went through all sources and used the
814    explicit (and relatively new) $-notation.  See system/README and the
815    CM manual for more info on this.
816    
817    I also modified the anchoring scheme for some things such as "smlnj",
818    "MLRISC", "cm", etc. to take advantage of the fact that explicit
819    anchors are more expressive: anchor name and first arc do not have to
820    coincide.  This entails the following user-visible change:
821    
822    You have to write $smlnj/foo/bar instead of smlnj/foo/bar.  In
823    particular, when you fire up sml with a command-line argument, say,
824    e.g.:
825    
826       sml '$smlnj/cmb.cm'
827    
828    At the ML toplevel prompt:
829    
830       CM.autoload "$smlnj/cmb.cm";
831    
832    There is also a new controller in CM.Control that can be used to turn
833    off all remaining support for implicit anchors by saying:
834    
835        CM.autoload "$smlnj/
836        #set CM.Control.implicit_anchors false;
837    
838    This causes CM to reject implicitly anchored paths.  This is (for the
839    time being) less permissive than the "final" version where there will
840    be no more such implicit anchors and relative paths will be just that:
841    relative.
842    
843    The next step (version after next version?) will be to make the
844    default for CM.Control.implicit_anchors false.  After the dust has
845    settled, I can then produce the "final" version of this...
846    
847    Note: Since bootstrapping is a bit tricky, I provided new boot files.
848    
849    ----------------------------------------------------------------------
850    Name: Matthias Blume
851    Date: 2000/05/11 16:30:00 JST
852    Tag: blume-20000511-sources
853    Description:
854    
855    The main change is that I added function CM.sources as a generalized
856    version of the earlier CM.makedepend.  This entails the following
857    additional changes:
858    
859      - CM.makedepend has been dropped.
860    
861      - CM manual has been updated.
862    
863      - TOOLS signature and API have been changed.
864    
865    ----------------------------------------------------------------------
866    Name: Allen Leung
867    Date: 2000/05/10 21:17 EDT
868    Tag: leunga-20000510-moby-c--ssa
869    Description:
870    
871      Various bug fixes and new features for C--, Moby and MLRISC optimizations.
872    None of these affect SML/NJ.
873    
874    1. Register Allocation
875    
876        a. A new ra spilling module (ra/ra-spill-with-renaming) is implemented.
877           This module tries to remove local (i.e. basic block level) redundancies
878           during spilling.
879    
880        b. A new framework for performing region based register allocation.
881           Not yet entirely functional.
882    
883    2. X86
884    
885       a. DefUse for POP was missing the stack pointer [found by Lal]
886       b. Reload for CALL was incorrect in X86Spill [found by John]
887       c. Various fixes in X86Spill so that it can be used correctly for
888          the new spilling module.
889    
890    3. SSA/IR
891    
892       a. New module ir/dj-dataflow.sml implements elimination based
893          data flow analysis.
894    
895    4. MLRiscGen
896    
897       a. Fix for gc type annotation
898    
899    5. MDGen
900    
901       Various fixes for machine description -> ml code translation.  For ssa
902       only.
903    
904    ----------------------------------------------------------------------
905    Name: Allen Leung
906    Date: 2000/05/08 22:17 EDT
907    Tag: leunga-20000508-labexp
908    Description:
909    
910      Fermin has found a few assembly problems with constant expressions
911      generated in LabelExp.  Mostly, the problems involve extra parentheses,
912      which choke on dumb assemblers.  This is his fix.
913    
914    ----------------------------------------------------------------------
915    Name: Dave MacQueen
916    Date: 2000/04/09 14:00 EDT
917    Tag: dbm-20000502-Version_110_28
918    Description:
919    
920    1. Updated src/compiler/TopLevel/main/version.sml to version 110.28
921    
922    2. Updated config/version to 110.28
923    
924    3. Updated config/srcarchiveurl
925    
926    3. New boot files!
927       ftp://ftp.research.bell-labs.com/dist/smlnj/working/110.28/
928    
929    ----------------------------------------------------------------------
930    Name: Matthias Blume
931    Date: 2000/05/01 19:05:00 JST
932    Tag: blume-20000501-noweb
933    Description:
934    
935    A new noweb tool has been added.  The existing system is entirely
936    unaffected by this, but some CM users have asked for renewed noweb
937    support.  Everything is documented in the CM manual.
938    
939    New (plugin) libraries:
940    
941       noweb-tool.cm
942       nw-ext.cm
943    
944    ----------------------------------------------------------------------
945    Name: Dave MacQueen
946    Date: 2000/04/30 12:40PM EDT
947    Tag: dbm-20000430-bug_fixes
948    Description:
949    
950    1. Fix for bug 1498
951       smlnj/src/system/Basis/Implementation/Unsafe/object.sig
952       smlnj/src/system/Basis/Implementation/Unsafe/object.sml
953         added toRealArray function
954       smlnj/src/compiler/MiscUtil/print/ppobj.sml
955         added check for tag Obj.RealArray to array printing case in ppObj
956    
957    2. Fix for bug 1510
958       smlnj/src/compiler/Semant/types/typesutil.sml
959         fixed definition of dummyargs (used by equalTycon) so that
960         dummy args are distinct types
961    
962    ----------------------------------------------------------------------
963    Name: Matthias Blume
964    Date: 2000/04/30 01:00:00 JST
965    Tag: blume-20000430-versions
966    Description:
967    
968    1. CM version numbering added.  This is an implementation of Lal's
969       proposal for adding version numbers and version checking to .cm
970       files.  Lal said that his proposal was just that -- a proposal.
971       For the time being I went ahead and implemented it so that people
972       can comment on it.  Everything is completely backward-compatible
973       (except for the stable library format, i.e., new bootfiles!).
974    
975       As usual, see the CM manual for details.
976    
977    2. An alternative syntax for anchored paths has been implemented.
978       Dave has recently voiced the same concerns that I had when I did
979       this, so there should be some support.  My take is that eventually
980       I will let support for the current syntax (where anchors are
981       "implicit") fade out in favor of the new, explicit syntax.
982       In order to be backward-compatible, both old and new syntax are
983       currently supported.
984    
985       Again, see the CM manual for details.
986    
987    3. Parallel make is trying to be slightly smarter:  When the master
988       process finds a "bottleneck", i.e., when there is only one
989       compilation unit that can be compiled and everybody else is
990       waiting on it, then it will simply compile it directly instead
991       of clumsily telling one of the slaves to do it.
992    
993    4. Support for "unsharing" added.  This is necessary in order to be
994       able to have two different versions of the same library running
995       at the same time (e.g., for trying out a new MLRISC while still
996       having the old MLRISC linked into the current compiler, etc.)
997       See the CM manual.
998    
999    5. Simple "makedepend" functionality added for generating Makefile
1000       dependency information.  (This is rather crude at the moment.
1001       Expect some changes here in the future.)
1002    
1003    6. ".fun" added as a recognized suffix for ML files. Also documented
1004       explicitly in the manual that the fallback behavior (unknown suffix
1005       -> ML file) is not an official feature!
1006    
1007    7. Small changes to the pickler for stable libraries.
1008    
1009    8. Several internal changes to CM (for cleanup/improvement).
1010    
1011    
1012    !!!! NEW BINFILES !!!!
1013    
1014    ----------------------------------------------------------------------
1015    Name: Matthias Blume
1016    Date: 2000/04/28 17:30:00 JST
1017    Tag: blume-20000428-pathconfig
1018    Description:
1019    
1020    1. I changed config/install.sh to remove duplicate entries from the
1021       lib/pathconfig file at the end.  Moreover, the final version of
1022       lib/pathconfig is sorted alphabetically.  The same (sorting) is done
1023       in src/system/installml.
1024    
1025    2. The config/install.sh script now consistently uses relative
1026       pathnames in lib/pathconfig whenever the anchor is in the lib
1027       directory.  (So far this was true for the libraries that come
1028       pre-compiled and bundled as part of the bootfiles but not for
1029       libraries that are compiled by the script itself.)
1030    
1031    ----------------------------------------------------------------------
1032    Name: Matthias Blume
1033    Date: 2000/04/26 13:10:00 JST
1034    Tag: blume-20000426-fun_suffix
1035    Description:
1036    
1037    Added ".fun" as a recognized file name suffix (for ML code).
1038    
1039    ----------------------------------------------------------------------
1040    Name: Allen Leung
1041    Date: 2000/04/25 17:00:00 EST
1042    Tag: leunga-20000425-alpha-ra
1043    Description:
1044    
1045    1. Alpha
1046    
1047        PSEUDOARITH was missing in AlphaRewrite.  This causes an endless loop
1048    in C--.
1049    
1050    2. RA
1051    
1052       Added a flag "ra-dump-size" to print out the size of the flowgraph
1053       and the interference graph.
1054    
1055    ----------------------------------------------------------------------
1056    Name: Dave MacQueen
1057    Date: 2000/04/25/
1058    Tag: dbm-20000425-mlyacc_doc_examples
1059    Description:
1060      Updated mlyacc.tex sections 5 and 7 for SML '97 and CM.
1061      Updated all three examples in src/ml-yacc/examples to run
1062      under 110.* using CM.make.
1063    
1064    ----------------------------------------------------------------------
1065    Name: Allen Leung
1066    Date: 2000/04/20 23:04:00 EST
1067    Tag: leunga-20000420-ssa-c---stuff
1068    Description:
1069    
1070      This update synchronizes my repository with Yale's.  Most of these
1071    changes, however, do not affect SML/NJ at all (the RA is an exception).
1072    
1073    1. Register Allocator
1074    
1075       a. An improvement in the interference graph construction:
1076          Given a copy
1077    
1078                s <- t
1079    
1080          no interference edge between s and t is added for this definition of s.
1081    
1082       b. I've added two new spill heuristic modules that Fermin and I developed
1083          (in the new library RA.cm). These are unused in SML/NJ but maybe
1084          useful for others (Moby?)
1085    
1086    2. X86
1087    
1088       a. Various fixes in the backend provided by Fermin [C--] and Lal.
1089    
1090    3. Alpha
1091    
1092       a. Added the BSR instruction and code generation that goes with it [C--]
1093       b. Other fixes too numerous to recount provided by Fermin [C--]
1094    
1095    4. Regmaps
1096    
1097       a. The regmaps are not initialized with the identity physical bindings
1098          at creation time.  This is unneeded.
1099    
1100    5. MLRISC Optimizations
1101    
1102       a. The DJ-Graph module can now compute the iterated dominance frontiers
1103          intersects with liveness incrementally in linear time! Woohoo!
1104          This is now used in my new SSA construction algorithm.
1105    
1106       b. THe branch reorganization module is now smarter about linear chains of
1107          basic blocks.
1108    
1109    
1110    ----------------------------------------------------------------------
1111    Name: Matthias Blume
1112    Date: 2000/04/12 13:52:00 JST
1113    Tag: blume_main_v110p27_1
1114    Description:
1115    
1116    Changed install.sh script to handle archive files without version number
1117    and to use "boot.<arch>-<os>" instead of "sml.boot.<arch>-<os>" for the
1118    name of the boot file archive.
1119    
1120    ----------------------------------------------------------------------
1121    Name: Dave MacQueen
1122    Date: 2000/04/09 14:00 EDT
1123    Tag: dbm-20000410-Version_110_27
1124    Description:
1125    
1126    1. Updated src/compiler/TopLevel/main/version.sml to version 110.27
1127    
1128    2. Updated src/config/version to 110.27
1129    
1130    3. New boot files!
1131    
1132    ----------------------------------------------------------------------
1133    Name: Allen Leung
1134    Date: 2000/04/09 19:09:00 EST
1135    Tag: leunga-20000409-misc
1136    Description:
1137    
1138    1.  Yet another fix for x86 assembly for idivl, imull, mull and friends.
1139    
1140    2.  Miscellaneous improvements to MLRISC (unused in sml/nj)
1141    
1142    ----------------------------------------------------------------------
1143    Name: Stefan
1144    Date: 2000/04/07 10:00:00 EDT
1145    Tag: monnier-20000406-branch-handling
1146    Description:
1147    
1148    Improved handling of branches (mostly those generated from
1149    polymorphic equality), removed switchoff and changed the
1150    default optimization settings (more cpsopt and less flintopt).
1151    
1152    ----------------------------------------------------------------------
1153  Name: Allen Leung  Name: Allen Leung
1154  Date: 2000/04/06 01:30:00 EST  Date: 2000/04/06 01:30:00 EST
1155  Tag: leunga-20000406-peephole-x86-SSA-2  Tag: leunga-20000406-peephole-x86-SSA-2
# Line 87  Line 1225 
1225    
1226  3.  Assembly  3.  Assembly
1227    
1228      When generating assemby, resolve the value of client defined constants,      When generating assembly, resolve the value of client defined constants,
1229      instead of generating symbolic values.  This is controlled by the      instead of generating symbolic values.  This is controlled by the
1230      new flag "asm-resolve-constants", which is default to true.      new flag "asm-resolve-constants", which is default to true.
1231    
# Line 110  Line 1248 
1248    
1249  To this end, I arranged that instead of "structure Core" as "structure  To this end, I arranged that instead of "structure Core" as "structure
1250  _Core" is bound in the pervasive environment.  Core access is done via  _Core" is bound in the pervasive environment.  Core access is done via
1251  _Core (which can never be accidentially rebound because _Core is not a  _Core (which can never be accidentally rebound because _Core is not a
1252  legal surface-syntax symbol).  legal surface-syntax symbol).
1253    
1254  The current solution is much cleaner because the core environment is  The current solution is much cleaner because the core environment is
# Line 120  Line 1258 
1258  with dynamic and symbolic parts of the core environment.  with dynamic and symbolic parts of the core environment.
1259    
1260  Remaining hackery (to bind the "magic" symbol _Core) is localized in the  Remaining hackery (to bind the "magic" symbol _Core) is localized in the
1261  compilation mananger's bootstrap compiler (actually: in the "init group"  compilation manager's bootstrap compiler (actually: in the "init group"
1262  handling).  See the comments in src/system/smlnj/init/init.cmi for  handling).  See the comments in src/system/smlnj/init/init.cmi for
1263  more details.  more details.
1264    
# Line 235  Line 1373 
1373     (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
1374     used).     used).
1375    
1376     This was done to accomodate the new "make" and "shell" tools which     This was done to accommodate the new "make" and "shell" tools which
1377     facilitate fairly seemless hookup to portions of code managed using     facilitate fairly seamless hookup to portions of code managed using
1378     Makefiles or Shell scripts.     Makefiles or Shell scripts.
1379    
1380     There are no classes "shared" or "private" anymore.  Instead, the     There are no classes "shared" or "private" anymore.  Instead, the
# Line 248  Line 1386 
1386    
1387     All existing tools are described in the CM manual.     All existing tools are described in the CM manual.
1388    
1389     - Slightly better error handling.  (CM now surpresses many followup     - Slightly better error handling.  (CM now suppresses many followup
1390     error messages that tended to be more annoying than helpful.)     error messages that tended to be more annoying than helpful.)
1391    
1392  2. Major changes to the compiler's static environment data structures.  2. Major changes to the compiler's static environment data structures.
# Line 382  Line 1520 
1520    
1521       I've changed andl to testl in the floating point test sequence       I've changed andl to testl in the floating point test sequence
1522       whenever appropriate.  The Intel optimization guide states that       whenever appropriate.  The Intel optimization guide states that
1523       testl is perferable to andl.       testl is preferable to andl.
1524    
1525  7. RA (x86 only)  7. RA (x86 only)
1526    
# Line 564  Line 1702 
1702    
1703  1. Tools.registerStdShellCmdTool (from smlnj/cm/tool.cm) takes an  1. Tools.registerStdShellCmdTool (from smlnj/cm/tool.cm) takes an
1704  additional argument called "template" which is an optional string that  additional argument called "template" which is an optional string that
1705  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
1706  explanation.  explanation.
1707    
1708  2. A special-purpose tool can be "regisitered" by simply dropping the  2. A special-purpose tool can be "registered" by simply dropping the
1709  corresponding <...>-tool.cm (and/or <...>-ext.cm) into the same  corresponding <...>-tool.cm (and/or <...>-ext.cm) into the same
1710  directory where the .cm file lives that uses this tool.  (The  directory where the .cm file lives that uses this tool.  (The
1711  behavior/misfeature until now was to look for the tool description  behavior/misfeature until now was to look for the tool description
# Line 611  Line 1749 
1749  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
1750  <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,
1751  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
1752  perhaps got accidentially killed).  In this case, fixpt will quickly  perhaps got accidentally killed).  In this case, fixpt will quickly
1753  move through what exists before continuing where it left off earlier,  move through what exists before continuing where it left off earlier,
1754  and, thus, saves a lot of time.  and, thus, saves a lot of time.
1755    
# Line 661  Line 1799 
1799    it from that remote directory.    it from that remote directory.
1800    This should simplify installation further:  For machines that have    This should simplify installation further:  For machines that have
1801    access to the internet, just fetch <version>-config.tgz, unpack it,    access to the internet, just fetch <version>-config.tgz, unpack it,
1802    edit config/targets, and go (run config/install.sh).  The scipt will    edit config/targets, and go (run config/install.sh).  The script will
1803    fetch everything else that it might need all by itself.    fetch everything else that it might need all by itself.
1804    
1805    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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