Diff of /sml/branches/primop-branch-3/NOTES/HISTORY

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	revision 1229, Fri May 31 21:10:34 2002 UTC	revision 1390, Wed Sep 24 20:34:06 2003 UTC
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13	Description:	Description:
14
15	----------------------------------------------------------------------	----------------------------------------------------------------------
16		Name: Matthias Blume (blume (at) tti - c (dot) org)
17		Date: 2003/09/24 15:35:00 CDT
18		Tag: blume-20030924-synsock
19		Description:
20
21		Added a signature SYNCHRONOUS_SOCKET to basis.cm.  This is like SOCKET
22		but excludes all non-blocking operations.  Defined SOCKET (in Basis)
23		and CML_SOCKET in terms of SYNCHRONOUS_SOCKET.  Removed superfluous
24		implementations of non-blocking operations from CML's Socket
25		structure.
26
27		----------------------------------------------------------------------
28		Name: Matthias Blume (blume (at) tti - c (dot) org)
29		Date: 2003/09/24 15:10:05 CDT
30		Tag: blume-20030924-sockets
31		Description:
32
33		1. Fixed SOCKET API and implementation to match Basis spec.
34		This required changing the internal representation of sockets to one
35		that remembers (for each socket file descriptor) whether it is currently
36		blocking or non-blocking.  This state is maintained lazily (i.e., a system
37		call is made only if the state actually needs to change).
38
39		2. OS-specific details of sockets were moved into separate files, thus
40		making it possible to unify the bulk of the socket implementations
41		between Unix and Win32.
42
43		3. CML's socket API changed accordingly.
44		(Note that we need to remove non-blocking functions from this API
45		since they are redundant in the case of CML!)
46
47		4. CML's socket implementation now makes use of non-blocking functions
48		provided by Basis, thus removing all OS-dependent code from this part
49		of CML.
50
51		5. Changed Real64.precision from 52 to 53.  Minor cleanup in Real64 code.
52
53		----------------------------------------------------------------------
54		Name: Matthias Blume (blume (at) tti - c (dot) org)
55		Date: 2003/09/22 12:10:00 CDT
56		Tag: blume-20030922-110_43_2
57		Description:
58
59		Made a new interim version and bootfiles for developer's bootstrapping
60		convenience.
61
62		110.43.2 -- NEW BOOTFILES
63
64		----------------------------------------------------------------------
65		Name: Matthias Blume (blume (at) tti - c (dot) org)
66		Date: 2003/09/19 15:55:00 CDT
67		Tag: blume-20030919-cmdir
68		Description:
69
70		1. new-install.sh -> install.sh
71		2. changed default CM "metadata" directory name to ".cm" (instead of "CM")
72		3. tweaked installer so that another name instead of .cm can be chosen
73		at install time (by setting the CM_DIR_ARC environment variable
74		during installation); once installation is complete, the name is
75		fixed
76
77		----------------------------------------------------------------------
78		Name: Matthias Blume (blume (at) tti - c (dot) org)
79		Date: 2003/09/18 16:00:00 CDT
80		Tag: blume-20030918-110_43_1
81		Description:
82
83		Made a new interim version and bootfiles for developer's bootstrapping
84		convenience.
85
86		110.43.1 -- NEW BOOTFILES
87
88		----------------------------------------------------------------------
89		Name: Matthias Blume (blume (at) tti - c (dot) org)
90		Date: 2003/09/18 15:20:00 CDT
91		Tag: blume-20030918-misc
92		Description:
93
94		1. Exported fractionsPerSecond etc. from TimeImp (but not from Time as
95		this seems to be controversial at the moment) and used those in
96		Posix.ProcEnv.times.
97
98		2. Added Time.{from,to}Nanoseconds to Time.
99
100		3. Improved Real.{from,to}LargeInt by avoiding needless calculations.
101		For example, fromLargeInt never needs to look at more than 3 "big
102		digits" to get its 53 bits of precision.
103
104		----------------------------------------------------------------------
105		Name: Matthias Blume (blume (at) tti - c (dot) org)
106		Date: 2003/09/17 16:30:00 CDT
107		Tag: blume-20030917-real32-slices
108		Description:
109
110		Added an entry to the primitive environment
111		(compiler/Semant/statenv/prim.sml) for int32->real64 conversion and
112		added code to compiler/CodeGen/main/mlriscGen.sml to implement it.
113
114		Removed some of the "magic" constants in real64.sml and replaced them
115		with code that generates these values from their corresponding
116		integer counterparts.
117
118		Made all(?) the slice-related changes to the Basis and made everything
119		compile again...
120
121		----------------------------------------------------------------------
122		Name: Matthias Blume (blume (at) tti - c (dot) org)
123		Date: 2003/09/15 17:45:00 CDT
124		Tag: blume-20030915-rbase
125		Description:
126
127		Fixed bug in Real.fromLargeInt.
128
129		----------------------------------------------------------------------
130		Name: Matthias Blume (blume (at) tti - c (dot) org)
131		Date: 2003/09/13 18:11:00 CDT
132		Tag: blume-20030913-libinstall
133		Description:
134
135		Minor bugfix in config/libinstall (set anchor with path to
136		standalone tool after installing it, otherwise libraries that
137		need ml-lex or ml-yacc won't compile the first time the installer
138		runs).
139
140		----------------------------------------------------------------------
141		Name: Matthias Blume (blume (at) tti - c (dot) org)
142		Date: 2003/09/12 11:45:00 CDT
143		Tag: blume-20030912-various
144		Description:
145
146		- fixed bug in Real.toLargeInt
147		- fixed bug in Posix.ProcEnv.times
148		- changed inputLine functions to return an option
149		- minor installer improvements / bugfixes
150		- changed default @SMLalloc parameter for x86/celeron to 64k
151
152		----------------------------------------------------------------------
153		Name: Matthias Blume (blume (at) tti - c (dot) org)
154		Date: 2003/09/09 22:00:00 CDT
155		Tag: Release_110_43
156		Description:
157
158		New working release 110.43.  New bootfiles.
159
160		----------------------------------------------------------------------
161		Name: Matthias Blume (blume (at) tti - c (dot) org)
162		Date: 2003/09/09 19:20:00 CDT
163		Tag: blume-20030909-installer
164		Description:
165
166		Rewrote large parts of config/install.sh in SML (config/libinstall.sml).
167		Modified config/install.bat to take advantage of it.  Also modified
168		config/install.sh (and called it config/new-install.sh) to take advantage
169		of it on Unix systems.  (The SML code is (supposed to be) platform-
170		independent.)
171
172		The installer can now install everything under Win32
173		as well as under *nix as long as it compiles.
174
175		Other changes:
176
177		- made CML compile again under Win32
178		- made eXene compile under Win32 (by providing a fake structure UnixSock
179		and by using OS.Process.getEnv instead of Posix.ProcEnv.getenv)
180		- fixed a bug in nowhere: it assumed that type OS.Process.status is the
181		same as type int;  under Win32 it isn't
182		- fixed some slice-related problems in the win32-specific parts of CML
183		- added a functor argument "sameVol" to os-path-fn.sml in the Basis
184		(under Win32, the volume name is case-insensitive, and the
185		OS.Path code compares volume names for equality)
186
187		----------------------------------------------------------------------
188		Name: Matthias Blume (blume (at) tti - c (dot) org)
189		Date: 2003/09/08 11:55:00 CDT
190		Tag: blume-20030908-fullpath
191		Description:
192
193		Made Win32 version of OS.FileSys.fullPath return current directory
194		when given an empty string.  This is what the spec says, and incidentally,
195		CM depends on it.  (CM otherwise goes into an infinite loop in certain
196		cases when presented with the name of a non-existing .cm file.)
197
198		----------------------------------------------------------------------
199		Name: Matthias Blume (blume (at) tti - c (dot) org)
200		Date: 2003/09/04 16:30:00 CDT
201		Tag: blume-20030905-slices-etc
202		Description:
203
204		1. Changed interface to vectors and arrays in Basis to match
205		(draft) Basis spec.
206		2. Added signatures and implementations of slices according to
207		Basis spec.
208		3. Edited source code throughout the system to make it compile again
209		under 1. and 2.  (In some cases code had to be added to have it
210		match the new signatures.)
211		4. MLRISC should be backward-compatible: the copies of the originals
212		of files that needed to change under 3. were retained, the .cm files
213		check the compiler version number and use old versions when
214		appropriate.
215		5. Changed type of OS.FileSys.readDir and Posix.FileSys.readdir to
216		dirstream -> string option (in accordance with Basis spec).
217		6. When generating code that counts lines, ml-lex used function
218		CharVector.foldli, taking advantage of its old interface.
219		This has been replaced with the corresponding code from
220		CharVectorSlice.  (html-lex must be re-lexed!)
221		7. BitArray in smlnj-lib/Util has been extended/modified to match the
222		new MONO_ARRAY signature.  (Do we need BitArraySlice?)
223		8. Removed temporary additions (fromInternal, toInternal) from the
224		(now obsolete) IntInf in smlnj-lib/Util.
225		9. Cleaned up structure Byte.
226		10. Added localOffset, scan, and fromString to Date (according to spec).
227		Cleaned/corrected implementation of Date.
228		(Still need to check for correctness; implement better canonicalizeDate.)
229		11. Added "scan" to signature IEEE_REAL.
230		12. Some improvements to IntInf [in particular: efficiency-hack for
231		mod and rem when second operand is 2 (for parity checks).]
232		13. Changed representation of type Time.time, using a single IntInf.int
233		value counting microseconds.  This considerably simplified the
234		implementation of structure Time.  We now support negative time
235		values; scan and fromString handle signs.
236		14. Functor PrimIO now takes two additional arguments (VectorSlice and
237		ArraySlice).
238
239		----------------------------------------------------------------------
240		Name: Matthias Blume (blume (at) tti - c (dot) org)
241		Date: 2003/08/28 17:00:00 CDT
242		Tag: blume-20030828-intinf
243		Description:
244
245		This is a major update which comes with a version number bump
246		(110.42.99 -- yes, we are really close to 110.43 :-), NEW BOOTFILES,
247		and an implementation of IntInf in the Basis.
248
249		There are a fairly large number of related changes and updates throughout
250		the system:
251
252		Basis:
253		- Implemented IntInf.
254		- Made LargeInt a projection of IntInf (by filtering through INTEGER).
255		- Added some missing Real64 operations, most notably Real.toLargeInt.
256		- Added FixedInt as a synonym for Int32.
257
258		compiler:
259		* Added support for a built-in intinf type.
260		- literals
261		- pattern matching
262		- conversion shortcuts (Int32.fromLarge o Int.toLarge etc.)
263		- overloading on literals and operations
264
265		This required adding a primitive type intinf, some additional
266		primops, and implementations for several non-trivial intinf
267		operations in Core.  (The intinf type is completely abstract
268		to the compiler; all operations get delegated back to the Core.)
269
270		* Intinf equality is handled by polyequal.  However, the compiler
271		does not print its usual warning in this case (since polyequal
272		is the right thing to do there).
273
274		* Improved the organization of structure InlineT.
275
276		* A word about conversion primops:
277		If conversions involving intinf do not cancel out during
278		CPS contract, then the compiler must insert calls to Core functions.
279		Since all core access must be resolved already during the FLINT
280		translate phase, it would be too late a the time of CPS contract
281		to add new Core calls.  For this reason, conversion primops
282		for intinf carry two arguments:  1. the numeric argument that
283		they are supposed to convert, and 2. the Core function that
284		can help with this conversion if necessary.  If CPS contract
285		eliminates a primop, then the associated Core function becomes
286		dead and goes away.  Intinf conversion primops that do not get
287		eliminated by CPS contract get rewritten into calls of their
288		core functions by a separate, new phase.
289
290		interactive system:
291		- Control.Print.intinfDepth controls max length of intinf constants
292		being printed. (Analogous to Control.Print.stringDepth.)
293		- Cleanup in printutil and pputil: got rid of unused stuff and
294		duplicates; replaced some of the code with code that makes better
295		use of library functionality.
296
297		CM:
298		Bugfix: parse-errors in init group (system/smlnj/init/init.cmi)
299		are no longer silent.
300
301		CKIT:
302		Fixed mismatched uses of Int32 and LargeInt.  I always decided
303		in favor of LargeInt -- which is now the same as IntInf.
304		CKIT-knowledgable people should check whether this is what's
305		intended and otherwise change things back to using Int32 or
306		FixedInt.
307
308		Throughout the code:
309		Started using IntInf.int literals and built-in operations
310		(e.g., comparison with 0) where this seems appropriate.
311
312
313		----------------------------------------------------------------------
314		Name: Dave MacQueen (dbm@cs.uchicago.edu)
315		Date: 2003/08/13 11:36:00 CDT
316		Tag: dbm-20030813-mcz-merge1
317		Description:
318
319		Merging changes from the mcz-branch development branch into trunk.
320		These changes involve replacement of the emulated old prettyprinter
321		interface with direct use of the SML/NJ Lib PP library, and fixing
322		of a couple of bugs (895, 1186) relating to error messages.  A new
323		prettyprinter for ast datatypes (Elaborator/print/ppast.{sig,sml})
324		has been added.
325
326		----------------------------------------------------------------------
327		Name: Matthias Blume (blume (at) tti - c (dot) org)
328		Date: 2003/08/11 15:45:00 CDT
329		Tag: blume-20030811-windows
330		Description:
331
332		Version number bumped to 110.42.9.  NEW BOOTFILES!!!
333
334		http://smlnj.cs.uchicago.edu/dist/working/110.42.9/
335
336		This patch restores SML/NJ's ability to run under win32.  There are a
337		number of changes, including fixes for several bugs that had gone
338		unnoticed until now:
339
340		- uname "CYGWIN_NT*" is recognized as win32 (This is relevant only when
341		trying to run the win32 version from within cygwin.)
342
343		- There are a number of simple .bat scripts that substitute for their
344		corresponding Unix shell-scripts.  (See below.)
345
346		- The internals of ml-build have been modified slightly.  The main
347		difference is that instead of calling ".link-sml" (or link-sml.bat)
348		using OS.Process.system, the ML process delegates this task back
349		to the script.  Otherwise problems arise in mixed environments such
350		as Cygwin where scripts look and work like Unix scripts, but
351		where OS.Process.system cannot run them.
352
353		- In CM, the srcpath pickler used native pathname syntax -- which
354		is incorrect in the case of cross-compilation.  The new pickle format
355		is independent of platform-specific naming conventions.
356
357		- Path configuration files (such as lib/pathconfig) can now choose
358		between native and standard syntax.  Placing a line of the form
359
360		standard!
361
362		into the file causes all subsequent paths to be interpreted using
363		CM standard pathname syntax (= Unix conventions); a line
364
365		native!
366
367		switches back to native style.  This was needed so that
368		path config files can be written portably, see src/system/pathconfig.
369
370		- Runtime system:
371
372		- win32-filesys.c:  get_file_time and set_file_time now
373		access modification time, not creation time.
374
375		- I/O code made aware of new array representation.
376
377		- Bug fixes in X86.prim.masm.
378
379		- src/system/makeml made aware of win32. (For use under cygwin
380		and other Unix-environments for windows.)
381
382		- In Basis, fixed off-by-one error in win32-io.sml (function vecF)
383		which caused BinIO.inputAll to fail consistently.
384
385		.bat scripts:
386
387		Windows .bat scripts assume that SMLNJ_HOME is defined.
388
389		- sml.bat, ml-yacc.bat, ml-lex.bat:  Driver scripts for standalone
390		applications (sml, ml-yacc, ml-lex).
391		- ml-build.bat: analogous to ml-build.
392		- config\install.bat:  Analogous to config/install.sh.  This requires
393		that SMLNJ_HOME is set and that Microsoft Visual C is ready to use.
394		(nmake etc. must be on the path, and vcvars32 must have been run.)
395		Moreover, sources for ml-lex and ml-yacc need to exist under src,
396		and the bootfile hierarchy must have been unpacked under
397		sml.boot.x86-win32.
398		The script is very primitive and does a poor job at error checking.
399		It only installs the base system, ml-lex, and ml-yacc.  No other
400		libraries are being installed (i.e., you get only those that
401		are part of the compiler.)
402		- link-sml.bat:  analogous to .link-sml, but not currently used
403
404		Unrelated bug fixes:
405
406		- ml-nlffigen now exports structures ST_* corresponding to incomplete
407		types.
408		- Added getDevice to PP/src/pp-debug-fn.sml.  (Would not compile
409		otherwise.)
410
411		----------------------------------------------------------------------
412		Name: Dave MacQueen (macqueen@cs.uchicago.edu)
413		Date: 2003/06/17
414		Tag: macqueen-20030617-bug895
415		Description:
416
417		Modified compiler/Elaborator/print/pptype.sml to fix bug 895.
418		Tag will be used for new development branch (mcz-branch) for
419		use by MacQueen, (Lucasz) Zairek, and (George) Cao at uchicago.
420
421		----------------------------------------------------------------------
422		Name: Matthias Blume (blume (at) tti - c (dot) org)
423		Date: 2003/05/27 16:55:00 CDT
424		Tag: blume-20030527-polyeq
425		Description:
426
427		Tried to eliminated most cases of polymorphic equality.
428
429		----------------------------------------------------------------------
430		Name: Matthias Blume (blume (at) tti - c (dot) org)
431		Date: 2003/05/21 17:45:00 CDT
432		Tag: blume-20030517-complete
433		Description:
434
435		Two changes:
436
437		1. Added a flag for controlling whether non-exhaustive bindings will
438		be treated as errors (default is false).
439		2. Cleaned up the *entire* source tree so that CMB.make goes through
440		without a single non-exhaustive match- or bind warning.
441
442		----------------------------------------------------------------------
443		Name: Matthias Blume (blume (at) tti - c (dot) org)
444		Date: 2003/05/17 10:20:00 CDT
445		Tag: blume-20030517-absyn
446		Description:
447
448		1. Added cases for IF, WHILE, ANDALSO, and ORELSE to Absyn.
449
450		This mainly affects the quality of error messages.  However, some
451		of the code is now more straightforward than before. (Treatment of
452		the above four constructs in translate.sml is much simpler than
453		the "macro-expansion" that was going on before.  Plus, the mach-
454		compiler no longer gets invoked just to be able to compile an
455		if-expression.)
456
457		2. The ErrorMsg.Error exception is now caught and absorbed by the
458		interactive loop.
459
460		----------------------------------------------------------------------
461		Name: Allen Leung
462		Date: 2003/05/16 13:05:00 CDT
463		Tag: leunga-20030516-cygwin-runtime
464		Description:
465
466		Ported the runtime system to cygwin, which uses the unix
467		x86-unix bin files.  Missing/buggy features:
468
469		o getnetbyname, getnetbyaddr: these functions seem to be missing in
470		the Cygwin library.
471		o Ctrl-C handling may be flaky.
472		o Windows system calls and Windows I/O are not supported.
473
474		A new set of binfiles is located at:
475
476		http://www.dorsai.org/~leunga/boot.x86-unix.tgz
477
478		This is only needed for bootstrapping the cygwin version of smlnj.
479		Other x86 versions can use the existing binfiles.
480
481		----------------------------------------------------------------------
482		Name: Matthias Blume
483		Date: 2003/04/08 15:42:00 CDT
484		Tag: blume-20030408-listpair
485		Description:
486
487		1. Added a target 'mlrisc' to installer.
488
489		2. Added missing elements to structure ListPair.
490
491		----------------------------------------------------------------------
492		Name: Allen Leung
493		Date: 2003/01/07 10:40:00 EST
494		Tag: leunga-20030107-int-rem
495		Description:
496
497		Fixed a bug in Int.rem(x,y) where y is a power of 2 on x86.
498		The arguments to the SUBL instruction were swapped.
499
500		----------------------------------------------------------------------
501		Name: Matthias Blume
502		Date: 2002/12/12 16:25:00 EST
503		Tag: blume-20021212-risc-ra
504		Description:
505
506		Fixed a serious bug in the rewrite code for FP spilling/reloading that
507		sent the RA into an infinite loop when floating point registers get
508		spilled.  (Because of this bug, e.g., nucleic stopped compiling between
509		110.37 and 110.38.)
510		There was another set of potential problems related to the handling of
511		MLRISC annotations (but those did not yet cause real problems, apparently).
512
513		----------------------------------------------------------------------
514		Name: Matthias Blume
515		Date: 2002/12/06 22:40:00 EST
516		Tag: blume-20021206-cm-fileid
517		Description:
518
519		Added a call of SrcPath.sync at the beginning of Parse.parse (in CM).
520		This fixes the problem of CM getting confused by files that suddenly
521		change their identity (e.g., by getting unlinked and recreated by some
522		text editor such as vi).  There might be a better/cheaper/cleaner way
523		of doing this, but for now this will have to do.
524
525		----------------------------------------------------------------------
526		Name: Matthias Blume
527		Date: 2002/10/28 09:50:00 EST
528		Tag: blume-20021028-typecheck
529		Description:
530
531		Exported structure Typecheck from $smlnj/viscomp/core.cm.
532
533		----------------------------------------------------------------------
534		Name: Matthias Blume
535		Date: 2002/10/17 09:10:00 EDT
536		Tag: Release_110_42
537		Description:
538
539		In good old tradition, there has been a slight hiccup so that we have
540		to patch 110.42 after the fact.   The old release tag has been replaced
541		(see below).
542
543		The change solves a problem with two competing approaches the
544		configuration problem regarding MacOS 10.1 vs. MacOS 10.2 which got in
545		each other's way.
546
547		This change only affects the runtime system code and the installer script.
548		(No new bootfiles.)
549
550		----------------------------------------------------------------------
551		Name: Matthias Blume
552		Date: 2002/10/16 12:00:00 EDT
553		Tag: Release_110_42_removed
554		Description:
555
556		New working release.  New bootfiles.
557
558		----------------------------------------------------------------------
559		Name: Matthias Blume
560		Date: 2002/10/10 13:10:00 EDT
561		Tag: blume-20021010-ppc-divs
562		Description:
563
564		The mltree operator DIVS must be implemented with an overflow check on
565		the PPC because the hardware indicates divide-by-zero using "overflow" as
566		well.
567
568		----------------------------------------------------------------------
569		Name: Matthias Blume
570		Date: 2002/07/23 11:45:00
571		Tag: blume-20020723-smlnj-home
572		Description:
573
574		Sml now senses the SMLNJ_HOME environment variable.  If this is set,
575		then the bin dir is assumed to be in $SMLNJ_HOME/bin and (unless
576		CM_PATHCONFIG is also set), the path configuration file is assumed
577		to be in $SMLNJ_HOME/lib/pathconfig.  This way one can easily move
578		the entire tree to some other place and everything will "just work".
579
580		(Companion commands such as ml-build and ml-makedepend also sense this
581		variable.)
582
583		----------------------------------------------------------------------
584		Name: Matthias Blume
585		Date: 2002/07/12 21:19:00 EDT
586		Tag: blume-20020712-liveness
587		Description:
588
589		Exported two useful "step" functions from liveness module (MLRISC).
590
591		----------------------------------------------------------------------
592		Name: Matthias Blume
593		Date: 2002/07/05 16:00 EDT
594		Tag: Release_110_41
595		Description:
596
597		New working release.  New bootfiles.
598
599		----------------------------------------------------------------------
600		Name: Matthias Blume
601		Date: 2002/07/05 10:25:00 EDT
602		Tag: blume-20020705-btimp
603		Description:
604
605		Exported structure BTImp from $smlnj/viscomp/debugprof.cm so that
606		other clients can set up backtracing support.
607
608		----------------------------------------------------------------------
609		Name: Matthias Blume
610		Date: 2002/06/25 17:23:00 EDT
611		Tag: blume-20020625-fpmax
612		Description:
613
614		Fixed a bug in translation of INLMAX (and INLMIN) for the floating-point
615		case.  (The sense of the isNaN test was reversed -- which made min and
616		max always return their first argument.)
617
618		----------------------------------------------------------------------
619		Name: Matthias Blume
620		Date: 2002/06/11
621		Tag: blume-20020611-unixpath
622		Description:
623
624		Back-ported OS.Path.{from,to}UnixPath from idlbasis-devel branch.
625
626		----------------------------------------------------------------------
627		Name: Matthias Blume
628		Date: 2002/06/10 16:35:00 EDT
629		Tag: blume-20020610-ieeereal
630		Description:
631
632		I back-ported my implementation of IEEEReal.fromString from the
633		idlbasis-devel branch so that we can test it.
634
635		Another small change is that ppDec tries to give more information
636		than just "<sig>" in the case of functors.  However, this code is
637		broken in some mysterious way if the functor's body's signature
638		has not been declared by ascription but gets inferred from the
639		implementation.  This needs fixing...
640
641		----------------------------------------------------------------------
642	Name: Matthias Blume	Name: Matthias Blume
643	Date: 2002/05/31	Date: 2002/05/31
644	Tag: blume-20020531-btrace-mode	Tag: blume-20020531-btrace-mode

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