Diff of /sml/trunk/HISTORY

Parent Directory | Revision Log | Patch

	revision 645, Mon May 15 07:17:30 2000 UTC	revision 763, Sat Dec 23 09:20:02 2000 UTC
#	Line 12	Line 12
12	Tag: <post-commit CVS tag>	Tag: <post-commit CVS tag>
13	Description:	Description:
14	----------------------------------------------------------------------	----------------------------------------------------------------------
15		Name: Lal George
16		Date: 2000/12/22 22:22:58 EST 2000
17		Tag: Release_110_32
18		Description:
19
20		Infinite precision used throughout MLRISC.
21		see MLRISC/mltree/machine-int.sig
22
23		----------------------------------------------------------------------
24		Name: Matthias Blume
25		Date: 2000/12/22 23:16:00 JST
26		Tag: blume-20001222-warn
27		Description:
28
29		Corrected wording and formatting of some CM warning message which I
30		broke in my previous patch.
31
32		----------------------------------------------------------------------
33		Name: Matthias Blume
34		Date: 2000/12/22 21:20:00 JST
35		Tag: blume-20001222-anchorenv
36		Description:
37
38		Fixed CM's handling of anchor environments in connection with CMB.make.
39
40		----------------------------------------------------------------------
41		Name: Matthias Blume
42		Date: 2000/12/22 13:15:00 JST
43		Tag: blume-20001222-cleanup
44		Description:
45
46		Removed src/cm/ffi which does not (and did not) belong here.
47
48		----------------------------------------------------------------------
49		Name: Matthias Blume
50		Date: 2000/12/21 23:55:00 JST
51		Tag: blume-20001221-exn
52		Description:
53
54		Probably most important: CM no longer silently swallows all exceptions
55		in the compiler.
56		Plus: some other minor CM changes.  For example, CM now reports some
57		sizes for generated binfiles (code, data, envpickle, lambdapickle).
58
59		----------------------------------------------------------------------
60		Name: Matthias Blume
61		Date: 2000/12/15 00:01:05 JST
62		Tag: blume-20001215-dirtool
63		Description:
64
65		- "dir" tool added.
66		- improvements and cleanup to Tools structure
67		- documentation updates
68
69		----------------------------------------------------------------------
70		Name: Allen Leung
71		Date: Thu Dec 14 03:45:24 EST 2000
72		Description:
73		Tag:  leunga-20001214-int-inf
74		Description:
75
76		In IntInf, added these standard functions, which are missing from our
77		implementation:
78
79		andb : int * int -> int
80		xorb : int * int -> int
81		orb  : int * int -> int
82		notb : int -> int
83		<<   : int * word -> int
84		~>>  : int * word -> int
85
86		Not tested, I hope they are correct.
87
88		----------------------------------------------------------------------
89		Name: Allen Leung
90		Date: Fri Dec  8 19:23:26 EST 2000
91		Description:
92		Tag:  leunga-20001208-nowhere
93		Description:
94
95		Slight improvements to the 'nowhere' tool to handle OR-patterns,
96		to generate better error messages etc.  Plus a brief manual.
97
98		----------------------------------------------------------------------
99		Name: Lal George
100		Date: 2000/12/08 09:54:02 EST 2000
101		Tag: Release_110_31
102		Description:
103
104		- Version 110.31
105		----------------------------------------------------------------------
106		Name: Allen Leung
107		Date: Thu Dec  7 22:01:04 EST 2000
108		Tag:  leunga-20001207-cell-monster-hack
109		Description:
110
111		Major MLRISC internal changes.  Affect all clients.
112		Summary:
113
114		1.  Type CELLS.cell = int is now replaced by a datatype.
115		As a result, the old regmap is now gone.  Almost all interfaces
116		in MLRISC change as a consequence.
117
118		2.  A new brand version of machine description tool (v3.0) that generates
119		modules expecting the new interface.  The old version is removed.
120
121		3.  The RA interface has been further abstracted into two new functors.
122		RISC_RA and X86RA.  These functors have much simpler interfaces.
123		[See also directory MLRISC/demo.]
124
125		4.  Some other new source->source code generation tools are available:
126
127		a. MLRISC/Tools/RewriteGen -- generate rewriters from rules.
128		b. MLRISC/Tools/WhereGen -- expands conditional pattern matching rules.
129		I use this tool to generate the peephole optimizers---with the new
130		cell type changes, peephole rules are becoming difficult to write
131		without conditional pattern matching.
132
133		5.  More Intmap -> IntHashTable change.  Previous changes by Matthias didn't
134		cover the entire MLRISC source tree so many things broke.
135
136		6.  CM files have been moved to the subdirectory MLRISC/cm.
137		They are moved because there are a lot of them and they clutter up the
138		root dir.
139
140		7.  More detailed documentation to come...
141
142		NOTE: To rebuild from 110.30 (ftp distribution), you'll have to do
143		a makeml -rebuild first.  This is because of other other
144		changes that Matthias has made (see below).
145
146
147		----------------------------------------------------------------------
148		Name: Matthias Blume
149		Date: 2000/11/30 23:12:00 JST
150		Tag: blume-20001130-filereorg
151		Description:
152
153		Some manual updates and some file reorganizations in CM.
154
155		----------------------------------------------------------------------
156		Name: Matthias Blume
157		Date: 2000/11/24 17:45:00 JST
158		Tag: blume-20001124-link
159		Description:
160
161		Drastically improved link traversal code for the case that the dynamic
162		value was already loaded at bootstrap time.  As a result, CM and CMB
163		now both load blazingly fast -- even on a very slow machine.  Also,
164		memory consumption has been further reduced by this.
165
166		Warning: The format of the PIDMAP file has changed.  THerefore, to
167		bootstrap you have to do this:
168
169		1. Run CMB.make
170		2. Make a symbolic link for the boot directory:
171		ln -s sml.boot.ARCH-OS xxx
172		3. "Rebuild" the boot directory:
173		./makeml -boot xxx -rebuild sml ; rm xxx
174		4. Boot normally:
175		./makeml
176
177		----------------------------------------------------------------------
178		Name: Matthias Blume
179		Date: 2000/11/21 21:20:00 JST
180		Tag: blume-20001121-tools
181		Description:
182
183		Continued hacking on autoloading problem -- with success this time.
184		Also changed tool-plugin mechanism.  See new CM manual.
185
186		----------------------------------------------------------------------
187		Name: Matthias Blume
188		Date: 2000/11/19 14:30:00 JST
189		Tag:  blume-20001119-autoload
190		Description:
191
192		Some hacking to make autoloading faster.  Success for CMB, no success
193		so far for CM.  There is a reduced structure CM' that autoloads faster.
194		(This is a temporary, non-documented hack to be eliminated again when
195		the general problem is solved.)
196
197		----------------------------------------------------------------------
198		Name: Matthias Blume
199		Date: 2000/11/17 14:10:00 JST
200		Tag: blume-20001117-pickle-lib
201		Description:
202
203		1. Eliminated comp-lib.cm
204		2. Made pickle-lib.cm
205		3. Eliminated all uses of intset.sml (from comp-lib.cm)
206		4. Replaced all uses of intmap.{sig,sml} (from comp-lib.cm) with
207		equivalent constructs from smlnj-lib.cm (INtHashTable).
208		5. Point 4. also goes for those uses of intmap.* in MLRISC.
209		Duplicated intmap modules thrown out.
210		6. Hunted down all duplicated SCC code and replaced it with
211		equivalent stuff (GraphSCCFn from smlnj-lib.cm).
212		7. Rewrote Feedback module.
213		8. Moved sortedlist.sml into viscomp-lib.cm.  Eventually it
214		should be thrown out and equivalent modules from smlnj-lib.cm
215		should be used (IntRedBlackSet, IntListSet, ...).
216
217		Confirmed that compiler compiles to fixpoint.
218
219		----------------------------------------------------------------------
220		Name: Allen Leung
221		Date: 2000/11/10 18:00:00
222		Tag: leunga-20001110-new-x86-fp
223
224		A new x86 floating point code generator has been added.
225		By default this is turned off.  To turn this on, do:
226
227		CM.autoload "$smlnj/compiler.cm";
228		Compiler.Control.MLRISC.getFlag "x86-fast-fp" := true;
229
230		Changes:
231
232		1.  Changed FTAN to FPTAN so that the assembly output is correct.
233		2.  Changed the extension callback for FTANGENT to generate:
234
235		fptan
236		fstp  %st(0)
237		instead of
238		fptan
239		fstpl ftempmem
240
241		3.  Numerous assembly fixes for x86.
242
243		5.  Cleaned up the machine code output module x86/x86MC.sml and added
244		support for a whole bunch of instructions and addressing modes:
245
246		fadd/fsub/fsubr/fmul/fdiv/fdivr  %st, %st(n)
247		faddp/fsubp/fsubrp/fmulp/fdivp/fdivrp  %st, %st(n)
248		fadd/fsub/fsubr/fmul/fdiv/fdivr  %st(n), %st
249		fiadd/fisub/fisubr/fimul/fidiv/fidivr mem
250		fxch %st(n)
251		fld %st(n)
252		fst %st(n)
253		fst mem
254		fstp %st(n)
255		fucom %st(n)
256		fucomp %st(n)
257
258		All these are now generated when the fast fp mode is turned on.
259
260		6.  Removed the dedicated registers %st(0), ..., %st(7) from X86CpsRegs
261
262		----------------------------------------------------------------------
263		Name: Matthias Blume
264		Date: 2000/11/09 11:20:00 JST
265		Tag: blume-20001109-scc
266		Description:
267
268		Eliminated some code duplication:
269
270		1. Added "where" clause to GraphSCCFn in SML/NJ Library.
271		(Otherwise the functor is useless.)
272		2. Used GraphSCCFn where SCCUtilFun was used previously.
273		3. Got rid of SCCUtilFun (in comp-lib.cm).
274
275		----------------------------------------------------------------------
276		Name: Lal George
277		Date: 2000/11/06 09:02:21 EST 2000
278		Tag: Release_110_30
279		Description:
280
281		- Version 110.30
282		----------------------------------------------------------------------
283		Name: Matthias Blume
284		Date: 2000/11/04 14:45:00
285		Tag: blume-20001104-mlbuild
286		Description:
287
288		- Made ml-build faster on startup.
289		- Documentation fixes.
290
291		----------------------------------------------------------------------
292		Name: Matthias Blume
293		Date: 2000/11/02 17:00:00 JST
294		Tag: blume-20001102-condcomp
295		Description:
296
297		- Small tweaks to pickler -- new BOOTFILES!
298		- Version bumped to 110.29.2.
299		- Added conditional compilation facility to init.cmi (see comment there).
300		----------------------------------------------------------------------
301		Name: Allen Leung
302		Date: 2000/10/23 19:31:00
303		Tag: leunga-20001023-demo-ra
304
305		1. Minor RA changes that improves spilling on x86 (affects Moby and C-- only)
306		2. Test programs for the graph library updated
307		3. Some new MLRISC demo programs added
308
309		----------------------------------------------------------------------
310		Name: Matthias Blume
311		Date: 2000/08/31 22:15:00 JST
312		Tag: blume-20001017-errmsg
313		Description:
314
315		More error message grief: Where there used to be no messages, there
316		now were some that had bogus error regions.  Fixed.
317
318		----------------------------------------------------------------------
319		Name: Matthias Blume
320		Date: 2000/08/31 17:30:00 JST
321		Tag: blume-20001017-v110p29p1
322		Description:
323
324		I made a version 110.29.1 with new bootfiles.
325
326		Changes:  Modified pickler/unpickler for faster and leaner unpickling.
327		CM documentation changes and a small bugfix in CM's error reporting.
328
329		----------------------------------------------------------------------
330		Name: Lal George
331		Date: 2000/09/27 14:42:35 EDT
332		Tag: george-20000927-nodestatus
333		Description:
334
335		Changed the type of the nodestatus, so that:
336
337		SPILLED(~1)             is now SPILLED
338		SPILLED(m) where m>=0   is now MEMREG(m)
339		SPILLED(s) where s<~1   is now SPILL_LOC(~s)
340
341		----------------------------------------------------------------------
342		Name: Matthias Blume
343		Date: 2000/09/07 14:45:00 JST
344		Tag: blume-20000907-cmerrmsg
345		Description:
346
347		Small tweak to CM to avoid getting ML syntax error messages twice.
348
349		----------------------------------------------------------------------
350		Name: Matthias Blume
351		Date: 2000/08/31 18:00:00 JST
352		Tag: blume-20000831-cvsbootfiles
353		Description:
354
355		New URL for boot files (because the 110.29 files on the BL server do
356		now work correctly with my updated install scripts for yacc and lex).
357
358		----------------------------------------------------------------------
359		Name: Matthias Blume
360		Date: 2000/08/08 12:33:00 JST
361		Tag: blume-20000808-manual
362		Description:
363
364		Tiny update to CM manual.
365
366		----------------------------------------------------------------------
367		Name: Allen Leung
368		Date: 2000/08/7 19:31:00
369		Tag: leunga-20000807-a-whole-bunch-of-stuff
370
371		Moby, C--, SSA, x86, machine descriptions etc.  Should only affect C--
372		and Mobdy.
373
374		1.  x86
375
376		a.  Fixes to peephole module by John and Dan.
377		b.  Assembly fix to SETcc by Allen.
378		c.  Fix to c-call by John.
379		d.  Fix to spilling by John.  (This one deals with the missing FSTPT case)
380		e.  Instruction selection optimization to SETcc as suggested by John.
381
382		For example,
383
384		MV(32, x, COND(32, CMP(32, LT, a, b), LI 1, LI 0))
385
386		should generate:
387
388		MOVL a, x
389		SUBL b, x
390		SHRL 31, x
391
392		2.  IR stuff
393
394		A bunch of new DJ-graph related algorithms added.  These
395		speed up SSA construction.
396
397		3.  SSA + Scheduling
398
399		Added code for SSA and scheduling to the repository
400
401		----------------------------------------------------------------------
402		Name: Lal George
403		Date: 2000/07/27 11:53:14 EDT
404
405		Tag: lal-20000727-linux-ppc
406		Description:
407
408		Made changes to support Linux PPC.
409		p.s. I have confirmation that the 110.29 boot files work fine.
410
411		----------------------------------------------------------------------
412		Name: Matthias Blume
413		Date: 2000/07/27 17:40:00 JST
414		Tag: blume-20000727-scripts
415		Description:
416
417		!!!! WARNING !!!!
418		You must recompile the runtime system!
419		!!!! WARNING !!!!
420
421		This is basically another round of script-enhancements:
422
423		1. sml, ml-build, and ml-makedepend accept options -D and -U to define
424		and undefine CM preprocessor symbols.
425
426		2. ml-build avoids generating a new heap image if it finds that the
427		existing one is still ok.  (The condition is that no ML file had to
428		be recompiled and all ML files are found to be older that the heap
429		file.)
430
431		To make this work smoothly, I also hacked the runtime system as
432		well as SMLofNJ.SysInfo to get access to the heap image suffix
433		(.sparc-solaris, ...) that is currently being used.
434
435		Moreover, the signature of CM.mk_standalone has changed.  See the
436		CM manual.
437
438		3. ml-makedepend accepts additional options -n, -a, and -o.  (See the
439		CM manual for details.)
440
441		4. More CM manual updates:
442		- all of the above has been documented.
443		- there is now a section describing the (CM-related) command line
444		arguments that are accepted by the "sml" command
445
446		----------------------------------------------------------------------
447		Name: Matthias Blume
448		Date: 2000/07/25 16:20:00 JST
449		Tag: blume-20000725-makedepend
450		Description:
451
452		Added a script called ml-makedepend.  This can be used in makefiles
453		for Unix' make in a way very similar to the "makedepend" command for
454		C.
455
456		The script internally uses function CM.sources.
457
458		Synopsis:
459
460		ml-makedepend [-f makefile] cmfile targetname
461
462		The default for the makefile is "makefile" (or "Makefile" should
463		"makefile" not exist).
464
465		ml-makedepend adds a cmfile/targetname-specific section to this
466		makefile (after removing the previous version of this section).  The
467		section contains a single dependency specification with targetname on
468		the LHS (targetname is an arbitrary name), and a list of files derived
469		from the cmfile on the RHS.  Some of the files on the RHS are
470		ARCH/OPSYS-specific.  Therefore, ml-makedepend inserts references to
471		"make" variables $(ARCH) and $(OPSYS) in place of the corresponding
472		path names.  The makefile writer is responsible for making sure that
473		these variables have correct at the time "make" is invoked.
474
475		----------------------------------------------------------------------
476		Name: Matthias Blume
477		Date: 2000/07/22 23:30:00 JST
478		Tag: blume-20000722-urlupdate
479		Description:
480
481		Changed BOOT and config/srcarchiveurl to point to BL server:
482
483		ftp://ftp.research.bell-labs.com/dist/smlnj/working/110.29/
484
485		----------------------------------------------------------------------
486		Name: Matthias Blume
487		Date: 2000/07/18 18:00:00 JST
488		Tag: blume-20000718-Version_110_29
489		Description:
490
491		1. Updated src/compiler/TopLevel/main/version.sml to version 110.29
492
493		2. Updated config/version to 110.29
494
495		3. Updated config/srcarchiveurl
496
497		3. New boot files!
498		ftp://ftp.cs.princeton.edu/pub/people/blume/sml/110.29-autofetch
499
500		----------------------------------------------------------------------
501		Name: Matthias Blume
502		Date: 2000/07/11 13:58:00 JST
503		Tag: blume-20000711-doctypo
504		Description:
505
506		Fixed a few typos in CM manual.
507
508		----------------------------------------------------------------------
509		Name: Allen Leung
510		Date: 2000/06/15 00:38:00
511		Tag: leunga-20000704-sparc-x86
512
513		1. x86 peephole improvement sp += k; sp -= k => nop  [from John]
514		2. fix to x86 RET bug [found by Dan Grossman]
515		3. sparc assembly bug fix for ticc instructions [found by Fermin]
516
517		Affects c-- and moby only
518
519		----------------------------------------------------------------------
520		Name: Matthias Blume
521		Date: 2000/07/04 15:26:00
522		Tag: blume-20000704-trigger
523		Description:
524
525		1. Improvements to CM manual.
526		2. SMLofNJ.Internals.BTrace.trigger reinstated as an alternative way
527		of getting a back-trace.  The function, when called, raises an
528		internal exception which explicitly carries the full back-trace history,
529		so it is unaffected by any intervening handle-raise pairs ("trivial"
530		or not).  The interactive loop will print that history once it arrives
531		at top level.
532		Short of having all exceptions implicitly carry the full history, the
533		recommended way of using this facility is:
534		- compile your program with instrumentation "on"
535		- run it, when it raises an exception, look at the history
536		- if the history is "cut off" because of some handler, go and modify
537		your program so that it explicitly calls BTrace.trigger
538		- recompile (still instrumented), and rerun; look at the full history
539
540		----------------------------------------------------------------------
541		Name: Matthias Blume
542		Date: 2000/07/03 15:36:00 JST
543		Tag: blume-20000702-manual
544		Description:
545
546		Small corrections and updates to CM manual.
547
548		----------------------------------------------------------------------
549		Name: Matthias Blume
550		Date: 2000/06/29 16:04:00 JST
551		Tag: blume-20000629-yacctool
552		Description:
553
554		Changes:
555
556		1. Class "mlyacc" now takes separate arguments to pass options to
557		generated .sml- and .sig-files independently.
558		2. Corresponding CM manual updates.
559		3. BTrace module now also reports call sites.  (However, for loop clusters
560		it only shows from where the cluster was entered.)  There are associated
561		modifications to core.sml, internals.{sig,sml}, btrace.sml, and btimp.sml.
562
563		----------------------------------------------------------------------
564		Name: Matthias Blume
565		Date: 2000/06/27 16:51:00 JST
566		Tag: blume-20000627-noweb
567		Description:
568
569		Changes:
570
571		1. Implemented "subdir" and "witness" options for noweb tool.
572		This caused some slight internal changes in CM's tool implementation.
573		2. Fixed bug in "tool plugin" mechanism.  This is essentially cleaning
574		some remaining issues from earlier path anchor changes.
575		3. Updated CM manual accordingly.
576
577		4. Changed implementation of back-tracing so that I now consider it
578		ready for prime-time.
579
580		In particular, you don't have to explicitly trigger the back-trace
581		anymore.  Instead, if you are running BTrace-instrumented code and
582		there is an uncaught exception (regardless of whether or not it was
583		raised in instrumented code), the top-level evalloop will print
584		the back-trace.
585
586		Features:
587
588		- Instrumented and uninstrumented code work together seemlessly.
589		(Of course, uninstrumented code is never mentioned in actual
590		back-traces.)
591
592		- Asymptotic time- and space-complexity of instrumented code is
593		equal to that of uninstrumented code.  (This means that
594		tail-recursion is preserved by the instrumentation phase.)
595
596		- Modules whose code has been instrumented in different sessions
597		work together without problem.
598
599		- There is no penalty whatsoever on uninstrumented code.
600
601		- There is no penalty on "raise" expressions, even in
602		instrumented code.
603
604		A potential bug (or perhaps it is a feature, too):
605
606		A back-trace reaches no further than the outermost instrumented
607		non-trivial "raise".  Here, a "trivial" raise is one that is the
608		sole RHS of a "handle" rule.  Thus, back-traces reach trough
609
610		<exp> handle e => raise e
611
612		and even
613
614		<exp> handle Foo => raise Bar
615
616		and, of course, through
617
618		<exp> handle Foo => ...
619
620		if the exception was not Foo.
621
622		Back-traces always reach right through any un-instrumented code
623		including any of its "handle" expressions, trivial or not.
624
625		To try this out, do the following:
626
627		- Erase all existing binfiles for your program.
628		(You may keep binfiles for those modules where you think you
629		definitely don't need back-tracing.)
630		- Turn on back-trace instrumentation:
631		SMLofNJ.Internals.BTrace.mode (SOME true);
632		- Recompile your program.  (I.e., run "CM.make" or "use".)
633		- You may now turn instrumentation off again (if you want):
634		SMLofNJ.Internals.BTrace.mode (SOME false);
635		- Run your program as usual.  If it raises an exception that
636		reaches the interactive toplevel, then a back-trace will
637		automatically be printed.  After that, the toplevel loop
638		will print the exception history as usual.
639
640		----------------------------------------------------------------------
641		Name: Matthias Blume
642		Date: 2000/06/26 09:56:46 JST
643		Tag: blume-20000626-setup
644		Description:
645
646		CM: - setup-parameter to "sml" added; this can be used to run arbitrary
647		ML code before and after compiling a file (e.g., to set compiler
648		flags)
649
650		Compiler: - improved btrace API (in core.sml, internals.{sig,sml})
651		- associated changes to btrace.sml (BTrace instrumentation pass)
652		- cleaner implementation of btimp.sml (BTrace tracing and report
653		module)
654
655		CM manual: * new path encoding documented
656		* description of setup-parameter to "sml" added
657
658		The biggest user-visible change to back-tracing is that it is no
659		longer necessary to compile all traced modules within the same
660		session.  (This was a real limitation.)
661
662		----------------------------------------------------------------------
663		Name: Matthias Blume
664		Date: 2000/06/24 12:40:00 JST
665		Tag: blume-20000624-startup
666		Description:
667
668		Fixes startup slowdown problem.  (I was calling SrcPath.sync a _tad_
669		bit too often -- to put it mildly. :)
670
671		----------------------------------------------------------------------
672		Name: Matthias Blume
673		Date: 2000/06/23 18:20:00 JST
674		Tag: blume-20000623-btrace
675		Description:
676
677		This updates adds a backtrace facility to aid programmers in debugging
678		their programs.  This involves the following changes:
679
680		1. Module system/smlnj/init/core.sml (structure _Core) now has hooks for
681		keeping track of the current call stack.  When programs are compiled
682		in a special mode, the compiler will insert calls to these hooks
683		into the user program.
684		"Hook" means that it is possible for different implementations of
685		back-tracing to register themselves (at different times).
686
687		2. compiler/MiscUtil/profile/btrace.sml implements the annotation phase
688		as an Absyn.dec->Absyn.dec rewrite.  Normally this phase is turned off.
689		It can be turned on using this call:
690		SMLofNJ.Internals.BTrace.mode (SOME true);
691		Turning it off again:
692		SMLofNJ.Internals.BTrace.mode (SOME false);
693		Querying the current status:
694		SMLofNJ.Internals.BTrace.mode NONE;
695		Annotated programs are about twice as big as normal ones, and they
696		run a factor of 2 to 4 slower with a dummy back-trace plugin (one
697		where all hooks do nothing).  The slowdown with a plugin that is
698		actually useful (such as the one supplied by default) is even greater,
699		but in the case of the default plugin it is still only an constant
700		factor (amortized).
701
702		3. system/Basis/Implementation/NJ/internals.{sig,sml} have been augmented
703		with a sub-structure BTrace for controlling back-tracing.  In particular,
704		the above-mentioned function "mode" controls whether the annotation
705		phase is invoked by the compiler.  Another important function is
706		"trigger": when called it aborts the current execution and causes
707		the top-level loop to print a full back-trace.
708
709		4. compiler/MiscUtil/profile/btimp.sml is the current default plugin
710		for back-tracing.  It keeps track of the dynamic call stack and in
711		addition to that it keeps a partial history at each "level" of that
712		stack.  For example, if a tail-calls b, b tail-calls c, and c tail-calls
713		d and b (at separate times, dynamically), then the report will show:
714
715		GOTO   d
716		/c
717		GOTO  \b
718		CALL   a
719
720		This shows that there was an initial non-tail call of a, then a
721		tail-call to b or c, looping behavior in a cluster of functions that
722		consist of b and c, and then a goto from that cluster (i.e., either from
723		b or from c) to d.
724
725		Note that (depending on the user program) the amount of information
726		that the back-trace module has to keep track of at each level is bounded
727		by a constant.  Thus, the whole implementation has the same asymptotical
728		complexity as the original program (both in space and in time).
729
730		5. compiler/TopLevel/interact/evalloop.sml has been modified to
731		handle the special exception SMLofNJ.Internals.BTrace.BTrace
732		which is raised by the "trigger" function mentioned above.
733
734		Notes on usage:
735
736		- Annotated code works well together with unannotated code:
737		Unannotated calls simply do not show up at all in the backtrace.
738
739		- It is not a good idea to let modules that were annotated during
740		different sessions run at the same time.  This is because the compiler
741		chooses small integers to identify individual functions, and there
742		will be clashes if different modules were compiled in separate sessions.
743		(Nothing will crash, and you will even be told about the clashes, but
744		back-trace information will in general not be useful.)
745
746		- Back-tracing can be confused by callcc and capture.
747
748		- The only way of getting a back-trace right now is to explicitly
749		invoke the "trigger" function from your user program.  Eventually, we
750		should make every exception carry back-trace information (if
751		available).  But since this creates more overhead at "raise"-time
752		(similar to the current exnHistory overhead), I have not yet
753		implemented this.  (The implementation will be rather easy.)  With
754		exceptions carrying back-trace information, this facility will be even
755		more useful because users don't need to modify their programs...
756
757		- While it is possible to compile the compiler with back-trace
758		annotations turned on (I did it to get some confidence in
759		correctness), you must make absolutely sure that core.sml and
760		btimp.sml are compiled WITHOUT annotation!  (core.sml cannot actually
761		be compiled with annotation because there is no core access yet, but
762		if you compile btimp.sml with annotation, then the system will go into
763		an infinite recursion and crash.)
764		Since CM currently does not know about BTrace, the only way to turn
765		annotations on and off for different modules of the compiler is to
766		interrupt CMB.make, change the settings, and re-invoke it.  Of course,
767		this is awkward and clumsy.
768
769		Sample sessions:
770
771		Standard ML of New Jersey v110.28.1 [FLINT v1.5], June 5, 2000
772		- SMLofNJ.Internals.BTrace.mode (SOME true);
773		[autoloading]
774		[autoloading done]
775		val it = false : bool
776		- structure X = struct
777		-     fun main n = let
778		-         fun a (x, 0) = d x
779		-           | a (x, n) = b (x, n - 1)
780		-         and b (x, n) = c (x, n)
781		-         and c (x, n) = a (x, n)
782		-         and d x = e (x, 3)
783		-         and e (x, 0) = f x
784		-           | e (x, n) = e (x, n - 1)
785		-         and f 0 = SMLofNJ.Internals.BTrace.trigger ()
786		-           | f n = n * g (n - 1)
787		-         and g n = a (n, 3)
788		-     in
789		-         f n
790		-     end
791		- end;
792		structure X : sig val main : int -> int end
793		- X.main 3;
794		*** BACK-TRACE ***
795		GOTO   stdIn:4.2-13.20: X.main[2].f
796		GOTO-( stdIn:4.2-13.20: X.main[2].e
797		GOTO   stdIn:4.2-13.20: X.main[2].d
798		/ stdIn:4.2-13.20: X.main[2].a
799		| stdIn:4.2-13.20: X.main[2].b
800		GOTO-\ stdIn:4.2-13.20: X.main[2].c
801		CALL   stdIn:4.2-13.20: X.main[2].g
802		GOTO   stdIn:4.2-13.20: X.main[2].f
803		GOTO-( stdIn:4.2-13.20: X.main[2].e
804		GOTO   stdIn:4.2-13.20: X.main[2].d
805		/ stdIn:4.2-13.20: X.main[2].a
806		| stdIn:4.2-13.20: X.main[2].b
807		GOTO-\ stdIn:4.2-13.20: X.main[2].c
808		CALL   stdIn:4.2-13.20: X.main[2].g
809		GOTO   stdIn:4.2-13.20: X.main[2].f
810		GOTO-( stdIn:4.2-13.20: X.main[2].e
811		GOTO   stdIn:4.2-13.20: X.main[2].d
812		/ stdIn:4.2-13.20: X.main[2].a
813		| stdIn:4.2-13.20: X.main[2].b
814		GOTO-\ stdIn:4.2-13.20: X.main[2].c
815		CALL   stdIn:4.2-13.20: X.main[2].g
816		GOTO   stdIn:4.2-13.20: X.main[2].f
817		CALL   stdIn:2.15-17.4: X.main[2]
818		-
819
820		(Note that because of a FLINt bug the above code currently does not
821		compile without BTrace turned on.)
822
823		Here is another example, using my modified Tiger compiler:
824
825		Standard ML of New Jersey v110.28.1 [FLINT v1.5], June 5, 2000
826		- SMLofNJ.Internals.BTrace.mode (SOME true);
827		[autoloading]
828		[autoloading done]
829		val it = false : bool
830		- CM.make "sources.cm";
831		[autoloading]
832		...
833		[autoloading done]
834		[scanning sources.cm]
835		[parsing (sources.cm):parse.sml]
836		[creating directory CM/SKEL ...]
837		[parsing (sources.cm):tiger.lex.sml]
838		...
839		[wrote CM/sparc-unix/semant.sml]
840		[compiling (sources.cm):main.sml]
841		[wrote CM/sparc-unix/main.sml]
842		[New bindings added.]
843		val it = true : bool
844		- Main.compile ("../testcases/merge.tig", "foo.out");
845		*** BACK-TRACE ***
846		CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trvar
847		CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
848		CALL   lib/semant.sml:289.3-295.22: SemantFun[2].transExp.trexp.check[2]
849		GOTO   lib/semant.sml:289.3-295.22: SemantFun[2].transExp.trexp.check[2]
850		CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
851		CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
852		CALL   lib/semant.sml:488.3-505.6: SemantFun[2].transDec.trdec[2].transBody[2]
853		/ lib/semant.sml:411.65-543.8: SemantFun[2].transDec
854		CALL-\ lib/semant.sml:413.2-540.9: SemantFun[2].transDec.trdec[2]
855		CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
856		CALL   lib/semant.sml:8.52-558.4: SemantFun[2].transProg[2]
857		CALL   main.sml:1.18-118.4: Main.compile[2]
858		-
859
860		----------------------------------------------------------------------
861		Name: Matthias Blumen
862		Date: 2000/06/21 18:00:00 JST
863		Tag: blume-20000621-manual
864		Description:
865
866		CM manual update: Path environments documented.
867
868		----------------------------------------------------------------------
869		Name: Matthias Blume
870		Date: 2000/06/19 13:40:00
871		Tag: blume-20000619-manual
872		Description:
873
874		CM manual and system/README update.  This only covers the fact that
875		there are no more implicit anchors.  (Path environments and the "bind"
876		option to "cm" have yet to be documented.)
877
878		----------------------------------------------------------------------
879		Name: Matthias Blume
880		Date: 2000/06/19 11:05:00 JST
881		Tag: blume-20000619-chdir-bugfix
882		Description:
883
884		Fixed a bug in new SrcPath module that sometimes led to a bad chDir call.
885
886		----------------------------------------------------------------------
887		Name: Matthias Blume
888		Date: 2000/06/18 22:00:10 JST
889		Tag: blume-20000618-implicit-anchors-really-gone
890		Description:
891
892		I updates the previous HISTORY entry where I forgot to mention that
893		implicit anchors are no longer with us.
894
895		The current update also gets rid of the (now useless) controller
896		CM.Control.implicit_anchors.
897
898		----------------------------------------------------------------------
899		Name: Matthias Blume
900		Date: 2000/06/16 17:30:00 JST
901		Tag: blume-20000616-anchorenv
902		Description:
903
904		This patch implements the long anticipated (just kidding :) "anchor
905		environment" mechanism.  In the course of doing this, I also
906		re-implemented CM's internal "SrcPath" module from scratch.  The new
907		one should be more robust in certain boundary cases.  In any case, it
908		is a lot cleaner than its predecessor (IMHO).
909
910		This time, although there is yet another boot file format change, I
911		kept the unpickler backward-compatible.  As a result, no new bootfiles
912		are necessary and bootstrapping is straightforward.  (You cannot read
913		new bootfiles into an old system, but the other way around is no
914		problem.)
915
916		Visible changes:
917
918		** 0. Implicit path anchors (without the leading $-symbol) are no
919		longer recognized at all. This means that such path names are not
920		illegal either.  For example, the name basis.cm simply refers to a
921		local file called "basis.cm" (i.e, the name is an ordinary path
922		relative to .cm-files directory).  Or, to put it differently, only
923		names that start with $ are anchored paths.
924
925		** 1. The $<singlearc> abbreviation for $/<singlearc> has finally
926		vanished.
927
928		John (Reppy) had critizised this as soon as I originally proposed and
929		implemented it, but at that time I did not really deeply believe
930		him. :) Now I came full-circle because I need the $<singlearc> syntax
931		in another place where it cannot be seen as an abbreviation for
932		$/<singlearc>.  To avoid the confusion, $<singlearc> now means what it
933		seems to mean (i.e., it "expands" into the corresponding anchor
934		value).
935
936		However, when paths are used as members in CM description files, it
937		continues to be true that there must be at least another arc after the
938		anchor.  This is now enforced separately during semantic analysis
939		(i.e., from a lexical/syntactical point of view, the notation is ok.)
940
941		** 2. The "cm" class now accepts an option "bind".  The option's value
942		is a sub-option list of precisely two items -- one labeled "anchor"
943		and the other one labeled "value".  As you might expect, "anchor" is
944		used to specify an anchor name to be bound, and "value" specifies what
945		the anchor is being bound to.
946
947		The value must be a directory name and can be given in either standard
948		syntax (including the possibility that it is itself an anchored path)
949		or native syntax.
950
951		Examples:
952
953		foo.cm (bind:(anchor:bar value:$mystuff/bar))
954		lib.cm (bind:(anchor:a value:"H:\\x\\y\\z"))  (* only works under windows *)
955
956		and so on.
957
958		The meaning of this is that the .cm-file will be processed with an
959		augmented anchor environment where the given anchor(s) is/are bound to
960		the given values(s).
961
962		The rationale for having this feature is this: Suppose you are trying
963		to use two different (already stable) libraries a.cm and b.cm (that
964		you perhaps didn't write yourself).  Further, suppose each of these
965		two libraries internally uses its own auxiliary library $aux/lib.cm.
966		Normally you would now have a problem because the anchor "lib" can not
967		be bound to more than one value globally.  Therefore, the project that
968		uses both a.cm and b.cm must locally redirect the anchor to some other
969		place:
970
971		a.cm (bind:(anchor:lib value:/usr/lib/smlnj/a-stuff))
972		b.cm (bind:(anchor:lib value:/usr/lib/smlnj/b-stuff))
973
974		This hard-wires $lib/aux.cm to /usr/lib/smlnj/a-stuff/aux.cm or
975		/usr/lib/smlnj/b-stuff/aux.cm, respectively.
976
977		Hard-wiring path names is a bit inflexible (and CM will verbosely warn
978		you when you do so at the time of CM.stabilize).  Therefore, you can
979		also use an anchored path as the value:
980
981		a.cm (bind:(anchor:lib value:$a-lib))
982		b.cm (bind:(anchor:lib value:$b-lib))
983
984		Now you can globally configure (using the usual CM.Anchor.anchor or
985		pathconfig machinery) bindings for "a-lib" and "b-lib".  Since "lib"
986		itself is always locally bound, setting it globally is no longer
987		meaningful or necessary (but it does not hurt either).  In fact, "lib"
988		can still be used as a global anchor for separate purposes.  As a
989		matter of fact, one can locally define "lib" in terms of a global
990		"lib":
991
992		a.cm (bind:(anchor:lib value:$lib/a))
993		b.cm (bind:(anchor:lib value:$lib/b))
994
995		** 3: The encoding of path names has changed.  This affects the way
996		path names are shown in CM's progress report and also the internal
997		protocol encoding used for parallel make.
998
999		The encoding now uses one or more ':'-separated segments.  Each
1000		segments corresponds to a file that has been specified relative to the
1001		file given by its preceding segment.  The first segment is either
1002		relative to the CWD, absolute, or anchored.  Each segment itself is
1003		basically a Unix pathname; all segments but the first are relative.
1004
1005		Example:
1006
1007		$foo/bar/baz.cm:a/b/c.sml
1008
1009		This path denotes the file bar/a/b/c.sml relative to the directory
1010		denoted by anchor "foo".  Notice that the encoding also includes
1011		baz.cm which is the .cm-file that listed a/b/c.sml.  As usual, such
1012		paths are resolved relative to the .cm-files directory, so baz.cm must
1013		be ignored to get the "real" pathname.
1014
1015		To make this fact more obvious, CM puts the names of such "virtual
1016		arcs" into parentheses when they appear in progress reports. (No
1017		parentheses will appear in the internal protocol encoding.)  Thus,
1018		what you really see is:
1019
1020		$foo/bar/(baz.cm):a/b/c.sml
1021
1022		I find this notation to be much more informative than before.
1023
1024		Another new feature of the encoding is that special characters
1025		including parentheses, colons, (back)slashes, and white space are
1026		written as \ddd (where ddd is the decimal encoding of the character).
1027
1028		*** The CM manual still needs to be updated.
1029
1030		----------------------------------------------------------------------
1031		Name: Allen Leung
1032		Date: 2000/06/15 00:38:00
1033		Tag: leunga-20000615-x86-peephole
1034
1035		x86 Peephole fix by Fermin.  Affects c-- and moby only.
1036
1037		----------------------------------------------------------------------
1038		Name: Matthias Blume
1039		Date: 2000/06/12 11:40:00
1040		Tag: blume-20000612-parmakefix
1041		Description:
1042
1043		More cleanup after changing the file naming scheme: This time I
1044		repaired the parallel make mechanism for CMB.make which I broke earlier.
1045
1046		----------------------------------------------------------------------
1047		Name: Allen Leung
1048		Date: 2000/06/09 01:25:00
1049		Tag: leunga-20000609-various
1050
1051		None of these things should affect normal SML/NJ operations
1052
1053		1. Peephole improvements provided by Fermin (c--)
1054		2. New annotation DEFUSE for adding extra dependence (moby)
1055		3. New X86 LOCK instructions (moby)
1056		4. New machine description language for reservation tables (scheduling)
1057		5. Fixes to various optimization/analysis modules (branch chaining, dominator
1058		trees etc.)
1059		6. I've changed the CM files so that they can work with versions
1060		110.0.6, 110.25 and 110.28
1061
1062		----------------------------------------------------------------------
1063		Name: Matthias Blume
1064		Date: 2000/06/09 12:40:00
1065		Tag: blume-20000609-log
1066		Description:
1067
1068		- Removed all(?) remaining RCS Log entries from sources.
1069
1070		- Fixed bug in ml-yacc and ml-lex sources (use explicit anchors for
1071		anchored paths).
1072
1073		----------------------------------------------------------------------
1074		Name: Matthias Blume
1075		Date: 2000/06/07 17:00:00 JST
1076		Tag: blume-20000607-no-implicit-anchors
1077		Description:
1078
1079		1. This update changes the default setting for
1080		CM.Control.implicit_anchors from true to false.  This means that
1081		implicit anchors are no longer permitted by default.  I also tried to
1082		make sure that nothing else still relies on implicit anchors.
1083		(This is the next step on the schedule towards a CM that does not even
1084		have the notion of implicit anchors anymore.)
1085
1086		2. More CM manual updates.
1087
1088		3. I managed to track down and fix the pickling bug I mentioned last
1089		time.  Because of the previously existing workaround, this entails no
1090		immediate practical changes.
1091
1092		----------------------------------------------------------------------
1093		Name: Matthias Blume
1094		Date: 2000/06/06 11:15:00 JST
1095		Tag: blume-20000606-lazierpickle
1096		Description:
1097
1098		!!!! NEW BOOT FILES !!!!
1099
1100		* The main purpose of this update is to make library pickles lazier in
1101		order to reduce the initial space penalty for autoloading a library.
1102		As a result, it is now possible to have $smlnj/compiler.cm
1103		pre-registered.  This should take care of the many complaints or
1104		inquiries about missing structure Compiler.  This required changes to
1105		CM's internal data structures and small tweaks to some algorithms.
1106
1107		As a neat additional effect, it is no longer necessary (for the sake
1108		of lean heap image files) to distinguish between a "minimal" CM and a
1109		"full" CM.  Now, there is only one CM (i.e., the "full" version:
1110		$smlnj/cm.cm aka $smlnj/cm/full.cm), and it is always available at the
1111		interactive top level. ($smlnj/cm/minimal.cm is gone.)
1112
1113		To make the life of compiler-hackers easier, "makeml" now also
1114		pre-registers $smlnj/cmb.cm (aka $smlnj/cmb/current.cm).  In other
1115		words, after you bootstrap a new sml for the first time, you will not
1116		have to autoload $smlnj/cmb.cm again afterwards.  (The first time
1117		around you will still have to do it, though.)
1118
1119		* A second change consists of major updates to the CM manual.  There
1120		are now several appendices with summary information and also a full
1121		specification of the CM description file syntax.
1122
1123		* In directory src/system I added the script "allcross".  This script
1124		invokes sml and cross-compiles the compiler for all supported
1125		architectures.  (Useful when providing a new set of boot files.)
1126
1127		* There seems to be a latent bug in my "lazy pickles" mechanism.  I
1128		added a small tweak to pickle-util.sml to work around this problem,
1129		but it is not a proper fix yet.  I will investigate further.  (The
1130		effect of the bug was an inflation of library pickle size.)
1131
1132		* Version number increased to 110.28.1 (to avoid compatibility problems).
1133
1134		----------------------------------------------------------------------
1135		Name: Allen Leung
1136		Date: 2000/05/25 17:28 EDT
1137		Tag: leunga-20000525-ra
1138		Description:
1139
1140		Fixed a bug in freezing phase of the register allocator.
1141
1142		----------------------------------------------------------------------
1143		Name: Allen Leung
1144		Date: 2000/05/15 22:53 EDT
1145		Tag: leunga-20000515-alpha-x86-ra
1146		Description:
1147
1148		1. Alpha
1149
1150		Slight cleanup.  Removed the instruction SGNXL
1151
1152		2. X86
1153
1154		Added the following instructions to the instruction set:
1155
1156		ROLx, RORx,
1157		BTx, BTSx, BTLx, BTRx,
1158		XCHGx, and variants with the LOCK prefix
1159
1160		3. Register Allocation
1161
1162		The module ra-rewrite-with-renaming has been improved.
1163
1164		These have no effect on SML/NJ.
1165
1166		----------------------------------------------------------------------
1167	Name: Matthias Blume	Name: Matthias Blume
1168	Date: 2000/05/15 16:20:00 JST	Date: 2000/05/15 16:20:00 JST
1169	Tag: blume-20000515-lightrebuild	Tag: blume-20000515-lightrebuild
#	Line 470	Line 1622
1622
1623	3.  Assembly	3.  Assembly
1624
1625	When generating assemby, resolve the value of client defined constants,	When generating assembly, resolve the value of client defined constants,
1626	instead of generating symbolic values.  This is controlled by the	instead of generating symbolic values.  This is controlled by the
1627	new flag "asm-resolve-constants", which is default to true.	new flag "asm-resolve-constants", which is default to true.
1628
#	Line 493	Line 1645
1645
1646	To this end, I arranged that instead of "structure Core" as "structure	To this end, I arranged that instead of "structure Core" as "structure
1647	_Core" is bound in the pervasive environment.  Core access is done via	_Core" is bound in the pervasive environment.  Core access is done via
1648	_Core (which can never be accidentially rebound because _Core is not a	_Core (which can never be accidentally rebound because _Core is not a
1649	legal surface-syntax symbol).	legal surface-syntax symbol).
1650
1651	The current solution is much cleaner because the core environment is	The current solution is much cleaner because the core environment is
#	Line 503	Line 1655
1655	with dynamic and symbolic parts of the core environment.	with dynamic and symbolic parts of the core environment.
1656
1657	Remaining hackery (to bind the "magic" symbol _Core) is localized in the	Remaining hackery (to bind the "magic" symbol _Core) is localized in the
1658	compilation mananger's bootstrap compiler (actually: in the "init group"	compilation manager's bootstrap compiler (actually: in the "init group"
1659	handling).  See the comments in src/system/smlnj/init/init.cmi for	handling).  See the comments in src/system/smlnj/init/init.cmi for
1660	more details.	more details.
1661
#	Line 618	Line 1770
1770	(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
1771	used).	used).
1772
1773	This was done to accomodate the new "make" and "shell" tools which	This was done to accommodate the new "make" and "shell" tools which
1774	facilitate fairly seemless hookup to portions of code managed using	facilitate fairly seamless hookup to portions of code managed using
1775	Makefiles or Shell scripts.	Makefiles or Shell scripts.
1776
1777	There are no classes "shared" or "private" anymore.  Instead, the	There are no classes "shared" or "private" anymore.  Instead, the
#	Line 631	Line 1783
1783
1784	All existing tools are described in the CM manual.	All existing tools are described in the CM manual.
1785
1786	- Slightly better error handling.  (CM now surpresses many followup	- Slightly better error handling.  (CM now suppresses many followup
1787	error messages that tended to be more annoying than helpful.)	error messages that tended to be more annoying than helpful.)
1788
1789	2. Major changes to the compiler's static environment data structures.	2. Major changes to the compiler's static environment data structures.
#	Line 765	Line 1917
1917
1918	I've changed andl to testl in the floating point test sequence	I've changed andl to testl in the floating point test sequence
1919	whenever appropriate.  The Intel optimization guide states that	whenever appropriate.  The Intel optimization guide states that
1920	testl is perferable to andl.	testl is preferable to andl.
1921
1922	7. RA (x86 only)	7. RA (x86 only)
1923
#	Line 947	Line 2099
2099
2100	1. Tools.registerStdShellCmdTool (from smlnj/cm/tool.cm) takes an	1. Tools.registerStdShellCmdTool (from smlnj/cm/tool.cm) takes an
2101	additional argument called "template" which is an optional string that	additional argument called "template" which is an optional string that
2102	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
2103	explanation.	explanation.
2104
2105	2. A special-purpose tool can be "regisitered" by simply dropping the	2. A special-purpose tool can be "registered" by simply dropping the
2106	corresponding <...>-tool.cm (and/or <...>-ext.cm) into the same	corresponding <...>-tool.cm (and/or <...>-ext.cm) into the same
2107	directory where the .cm file lives that uses this tool.  (The	directory where the .cm file lives that uses this tool.  (The
2108	behavior/misfeature until now was to look for the tool description	behavior/misfeature until now was to look for the tool description
#	Line 994	Line 2146
2146	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
2147	<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,
2148	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
2149	perhaps got accidentially killed).  In this case, fixpt will quickly	perhaps got accidentally killed).  In this case, fixpt will quickly
2150	move through what exists before continuing where it left off earlier,	move through what exists before continuing where it left off earlier,
2151	and, thus, saves a lot of time.	and, thus, saves a lot of time.
2152
#	Line 1044	Line 2196
2196	it from that remote directory.	it from that remote directory.
2197	This should simplify installation further:  For machines that have	This should simplify installation further:  For machines that have
2198	access to the internet, just fetch <version>-config.tgz, unpack it,	access to the internet, just fetch <version>-config.tgz, unpack it,
2199	edit config/targets, and go (run config/install.sh).  The scipt will	edit config/targets, and go (run config/install.sh).  The script will
2200	fetch everything else that it might need all by itself.	fetch everything else that it might need all by itself.
2201
2202	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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