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[smlnj] Diff of /sml/trunk/HISTORY
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Diff of /sml/trunk/HISTORY

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revision 1085, Fri Feb 22 00:15:55 2002 UTC revision 1400, Wed Oct 1 22:06:25 2003 UTC
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13  Description:  Description:
14    
15  ----------------------------------------------------------------------  ----------------------------------------------------------------------
16    Name: Matthias Blume (blume (at) tti - c (dot) org)
17    Date: 2003/10/01 17:05:00 CDT
18    Tag: blume-20031001-lal-mlrisc
19    Description:
20    
21    MLRISC bug fix from Lal.
22    
23    ----------------------------------------------------------------------
24    Name: Matthias Blume (blume (at) tti - c (dot) org)
25    Date: 2003/09/30 16:10:00 CDT
26    Tag: blume-20030930-primio-bat
27    Description:
28    
29    1. Added openVector, nullRd, and nullWr to PRIM_IO.
30    2. Improved .bat files (for Win32 port) to make things work under Win95.
31       (thanks to Aaron S. Hawley for this one)
32    
33    ----------------------------------------------------------------------
34    Name: Matthias Blume (blume (at) tti - c (dot) org)
35    Date: 2003/09/26 16:05:00 CDT
36    Tag: blume-20030926-wrappriv
37    Description:
38    
39    Added missing wrapper for privilege "primitive" in $smlnj/viscomp/core.cm.
40    
41    ----------------------------------------------------------------------
42    Name: Matthias Blume (blume (at) tti - c (dot) org)
43    Date: 2003/09/26 15:00:00 CDT
44    Tag: blume-20030926-110_43_3
45    Description:
46    
47    - additional cleanup
48    - version number bump, NEW BOOTFILES
49    
50    ----------------------------------------------------------------------
51    Name: Matthias Blume (blume (at) tti - c (dot) org)
52    Date: 2003/09/26 12:00:00 CDT
53    Tag: blume-20030926-ppautoload
54    Description:
55    
56    I modified the read-eval-print loop so that the autoloader gets
57    invoked whenever the prettyprinter tries to look up a symbol that
58    is not currently defined in the toplevel environment but which
59    appears in CM's autoload registry.  As a result, we see far fewer of
60    those ?.Foo.Bar.xxx names in the prettyprinter's output.
61    
62    In addition to this I tried to clean up some pieces of the Basis
63    implementation (e.g., Socket, Word8Array) in order to prevent other
64    instances of these ?.Foo.Bar.xxx names from being printed.
65    
66    The mechanism that picks names for types still needs some work, though.
67    (Right now it seems that if there is a type A.t which is defined to
68    be B.u, but B is unavailable at toplevel, then A.t gets printed as
69    "?.B.u" although the perhaps more sensible solution would be to use
70    "A.t" in this case.  In other words, the prettyprinter should follow
71    a chain of DEFtycs not farther than there are corresponding toplevel
72    names in the current environment.)
73    
74    ----------------------------------------------------------------------
75    Name: Matthias Blume (blume (at) tti - c (dot) org)
76    Date: 2003/09/24 16:31:00 CDT
77    Tag: blume-20030924-installer
78    Description:
79    
80    Another installer tweak:  All the ML code for the installer is now
81    compiled during CMB.make and put into a little library called
82    $smlnj/installer.cm.  The installation then simply invokes
83    
84       sml -m $smlnj/installer.cm
85    
86    and everything happens automagically.
87    
88    Win32:  ML code senses value of environment variable SMLNJ_HOME.
89    Unix:   ML code senses values of environment variables ROOT, CONFIGDIR,
90            and BINDIR.
91    
92    The new scheme guarantees that the ML code responsible for the installation
93    is in sync with the APIs of the main system.  Also, the installer is
94    somewhat faster because the installer script is precompiled.
95    
96    ----------------------------------------------------------------------
97    Name: Matthias Blume (blume (at) tti - c (dot) org)
98    Date: 2003/09/24 15:35:00 CDT
99    Tag: blume-20030924-synsock
100    Description:
101    
102    Added a signature SYNCHRONOUS_SOCKET to basis.cm.  This is like SOCKET
103    but excludes all non-blocking operations.  Defined SOCKET (in Basis)
104    and CML_SOCKET in terms of SYNCHRONOUS_SOCKET.  Removed superfluous
105    implementations of non-blocking operations from CML's Socket
106    structure.
107    
108    ----------------------------------------------------------------------
109    Name: Matthias Blume (blume (at) tti - c (dot) org)
110    Date: 2003/09/24 15:10:05 CDT
111    Tag: blume-20030924-sockets
112    Description:
113    
114    1. Fixed SOCKET API and implementation to match Basis spec.
115       This required changing the internal representation of sockets to one
116       that remembers (for each socket file descriptor) whether it is currently
117       blocking or non-blocking.  This state is maintained lazily (i.e., a system
118       call is made only if the state actually needs to change).
119    
120    2. OS-specific details of sockets were moved into separate files, thus
121       making it possible to unify the bulk of the socket implementations
122       between Unix and Win32.
123    
124    3. CML's socket API changed accordingly.
125       (Note that we need to remove non-blocking functions from this API
126       since they are redundant in the case of CML!)
127    
128    4. CML's socket implementation now makes use of non-blocking functions
129       provided by Basis, thus removing all OS-dependent code from this part
130       of CML.
131    
132    5. Changed Real64.precision from 52 to 53.  Minor cleanup in Real64 code.
133    
134    ----------------------------------------------------------------------
135    Name: Matthias Blume (blume (at) tti - c (dot) org)
136    Date: 2003/09/22 12:10:00 CDT
137    Tag: blume-20030922-110_43_2
138    Description:
139    
140    Made a new interim version and bootfiles for developer's bootstrapping
141    convenience.
142    
143       110.43.2 -- NEW BOOTFILES
144    
145    ----------------------------------------------------------------------
146    Name: Matthias Blume (blume (at) tti - c (dot) org)
147    Date: 2003/09/19 15:55:00 CDT
148    Tag: blume-20030919-cmdir
149    Description:
150    
151    1. new-install.sh -> install.sh
152    2. changed default CM "metadata" directory name to ".cm" (instead of "CM")
153    3. tweaked installer so that another name instead of .cm can be chosen
154       at install time (by setting the CM_DIR_ARC environment variable
155       during installation); once installation is complete, the name is
156       fixed
157    
158    ----------------------------------------------------------------------
159    Name: Matthias Blume (blume (at) tti - c (dot) org)
160    Date: 2003/09/18 16:00:00 CDT
161    Tag: blume-20030918-110_43_1
162    Description:
163    
164    Made a new interim version and bootfiles for developer's bootstrapping
165    convenience.
166    
167       110.43.1 -- NEW BOOTFILES
168    
169    ----------------------------------------------------------------------
170    Name: Matthias Blume (blume (at) tti - c (dot) org)
171    Date: 2003/09/18 15:20:00 CDT
172    Tag: blume-20030918-misc
173    Description:
174    
175    1. Exported fractionsPerSecond etc. from TimeImp (but not from Time as
176       this seems to be controversial at the moment) and used those in
177       Posix.ProcEnv.times.
178    
179    2. Added Time.{from,to}Nanoseconds to Time.
180    
181    3. Improved Real.{from,to}LargeInt by avoiding needless calculations.
182       For example, fromLargeInt never needs to look at more than 3 "big
183       digits" to get its 53 bits of precision.
184    
185    ----------------------------------------------------------------------
186    Name: Matthias Blume (blume (at) tti - c (dot) org)
187    Date: 2003/09/17 16:30:00 CDT
188    Tag: blume-20030917-real32-slices
189    Description:
190    
191    Added an entry to the primitive environment
192    (compiler/Semant/statenv/prim.sml) for int32->real64 conversion and
193    added code to compiler/CodeGen/main/mlriscGen.sml to implement it.
194    
195    Removed some of the "magic" constants in real64.sml and replaced them
196    with code that generates these values from their corresponding
197    integer counterparts.
198    
199    Made all(?) the slice-related changes to the Basis and made everything
200    compile again...
201    
202    ----------------------------------------------------------------------
203    Name: Matthias Blume (blume (at) tti - c (dot) org)
204    Date: 2003/09/15 17:45:00 CDT
205    Tag: blume-20030915-rbase
206    Description:
207    
208    Fixed bug in Real.fromLargeInt.
209    
210    ----------------------------------------------------------------------
211    Name: Matthias Blume (blume (at) tti - c (dot) org)
212    Date: 2003/09/13 18:11:00 CDT
213    Tag: blume-20030913-libinstall
214    Description:
215    
216    Minor bugfix in config/libinstall (set anchor with path to
217    standalone tool after installing it, otherwise libraries that
218    need ml-lex or ml-yacc won't compile the first time the installer
219    runs).
220    
221    ----------------------------------------------------------------------
222    Name: Matthias Blume (blume (at) tti - c (dot) org)
223    Date: 2003/09/12 11:45:00 CDT
224    Tag: blume-20030912-various
225    Description:
226    
227     - fixed bug in Real.toLargeInt
228     - fixed bug in Posix.ProcEnv.times
229     - changed inputLine functions to return an option
230     - minor installer improvements / bugfixes
231     - changed default @SMLalloc parameter for x86/celeron to 64k
232    
233    ----------------------------------------------------------------------
234    Name: Matthias Blume (blume (at) tti - c (dot) org)
235    Date: 2003/09/09 22:00:00 CDT
236    Tag: Release_110_43
237    Description:
238    
239        New working release 110.43.  New bootfiles.
240    
241    ----------------------------------------------------------------------
242    Name: Matthias Blume (blume (at) tti - c (dot) org)
243    Date: 2003/09/09 19:20:00 CDT
244    Tag: blume-20030909-installer
245    Description:
246    
247    Rewrote large parts of config/install.sh in SML (config/libinstall.sml).
248    Modified config/install.bat to take advantage of it.  Also modified
249    config/install.sh (and called it config/new-install.sh) to take advantage
250    of it on Unix systems.  (The SML code is (supposed to be) platform-
251    independent.)
252    
253    The installer can now install everything under Win32
254    as well as under *nix as long as it compiles.
255    
256    Other changes:
257    
258      - made CML compile again under Win32
259      - made eXene compile under Win32 (by providing a fake structure UnixSock
260        and by using OS.Process.getEnv instead of Posix.ProcEnv.getenv)
261      - fixed a bug in nowhere: it assumed that type OS.Process.status is the
262        same as type int;  under Win32 it isn't
263      - fixed some slice-related problems in the win32-specific parts of CML
264      - added a functor argument "sameVol" to os-path-fn.sml in the Basis
265        (under Win32, the volume name is case-insensitive, and the
266        OS.Path code compares volume names for equality)
267    
268    ----------------------------------------------------------------------
269    Name: Matthias Blume (blume (at) tti - c (dot) org)
270    Date: 2003/09/08 11:55:00 CDT
271    Tag: blume-20030908-fullpath
272    Description:
273    
274    Made Win32 version of OS.FileSys.fullPath return current directory
275    when given an empty string.  This is what the spec says, and incidentally,
276    CM depends on it.  (CM otherwise goes into an infinite loop in certain
277    cases when presented with the name of a non-existing .cm file.)
278    
279    ----------------------------------------------------------------------
280    Name: Matthias Blume (blume (at) tti - c (dot) org)
281    Date: 2003/09/04 16:30:00 CDT
282    Tag: blume-20030905-slices-etc
283    Description:
284    
285      1. Changed interface to vectors and arrays in Basis to match
286         (draft) Basis spec.
287      2. Added signatures and implementations of slices according to
288         Basis spec.
289      3. Edited source code throughout the system to make it compile again
290         under 1. and 2.  (In some cases code had to be added to have it
291         match the new signatures.)
292      4. MLRISC should be backward-compatible: the copies of the originals
293         of files that needed to change under 3. were retained, the .cm files
294         check the compiler version number and use old versions when
295         appropriate.
296      5. Changed type of OS.FileSys.readDir and Posix.FileSys.readdir to
297         dirstream -> string option (in accordance with Basis spec).
298      6. When generating code that counts lines, ml-lex used function
299         CharVector.foldli, taking advantage of its old interface.
300         This has been replaced with the corresponding code from
301         CharVectorSlice.  (html-lex must be re-lexed!)
302      7. BitArray in smlnj-lib/Util has been extended/modified to match the
303         new MONO_ARRAY signature.  (Do we need BitArraySlice?)
304      8. Removed temporary additions (fromInternal, toInternal) from the
305         (now obsolete) IntInf in smlnj-lib/Util.
306      9. Cleaned up structure Byte.
307     10. Added localOffset, scan, and fromString to Date (according to spec).
308         Cleaned/corrected implementation of Date.
309         (Still need to check for correctness; implement better canonicalizeDate.)
310     11. Added "scan" to signature IEEE_REAL.
311     12. Some improvements to IntInf [in particular: efficiency-hack for
312         mod and rem when second operand is 2 (for parity checks).]
313     13. Changed representation of type Time.time, using a single IntInf.int
314         value counting microseconds.  This considerably simplified the
315         implementation of structure Time.  We now support negative time
316         values; scan and fromString handle signs.
317     14. Functor PrimIO now takes two additional arguments (VectorSlice and
318         ArraySlice).
319    
320    ----------------------------------------------------------------------
321    Name: Matthias Blume (blume (at) tti - c (dot) org)
322    Date: 2003/08/28 17:00:00 CDT
323    Tag: blume-20030828-intinf
324    Description:
325    
326    This is a major update which comes with a version number bump
327    (110.42.99 -- yes, we are really close to 110.43 :-), NEW BOOTFILES,
328    and an implementation of IntInf in the Basis.
329    
330    There are a fairly large number of related changes and updates throughout
331    the system:
332    
333    Basis:
334            - Implemented IntInf.
335            - Made LargeInt a projection of IntInf (by filtering through INTEGER).
336            - Added some missing Real64 operations, most notably Real.toLargeInt.
337            - Added FixedInt as a synonym for Int32.
338    
339    compiler:
340            * Added support for a built-in intinf type.
341              - literals
342              - pattern matching
343              - conversion shortcuts (Int32.fromLarge o Int.toLarge etc.)
344              - overloading on literals and operations
345    
346            This required adding a primitive type intinf, some additional
347            primops, and implementations for several non-trivial intinf
348            operations in Core.  (The intinf type is completely abstract
349            to the compiler; all operations get delegated back to the Core.)
350    
351            * Intinf equality is handled by polyequal.  However, the compiler
352            does not print its usual warning in this case (since polyequal
353            is the right thing to do there).
354    
355            * Improved the organization of structure InlineT.
356    
357            * A word about conversion primops:
358            If conversions involving intinf do not cancel out during
359            CPS contract, then the compiler must insert calls to Core functions.
360            Since all core access must be resolved already during the FLINT
361            translate phase, it would be too late a the time of CPS contract
362            to add new Core calls.  For this reason, conversion primops
363            for intinf carry two arguments:  1. the numeric argument that
364            they are supposed to convert, and 2. the Core function that
365            can help with this conversion if necessary.  If CPS contract
366            eliminates a primop, then the associated Core function becomes
367            dead and goes away.  Intinf conversion primops that do not get
368            eliminated by CPS contract get rewritten into calls of their
369            core functions by a separate, new phase.
370    
371    interactive system:
372            - Control.Print.intinfDepth controls max length of intinf constants
373            being printed. (Analogous to Control.Print.stringDepth.)
374            - Cleanup in printutil and pputil: got rid of unused stuff and
375            duplicates; replaced some of the code with code that makes better
376            use of library functionality.
377    
378    CM:
379            Bugfix: parse-errors in init group (system/smlnj/init/init.cmi)
380            are no longer silent.
381    
382    CKIT:
383            Fixed mismatched uses of Int32 and LargeInt.  I always decided
384            in favor of LargeInt -- which is now the same as IntInf.
385            CKIT-knowledgable people should check whether this is what's
386            intended and otherwise change things back to using Int32 or
387            FixedInt.
388    
389    Throughout the code:
390            Started using IntInf.int literals and built-in operations
391            (e.g., comparison with 0) where this seems appropriate.
392    
393    
394    ----------------------------------------------------------------------
395    Name: Dave MacQueen (dbm@cs.uchicago.edu)
396    Date: 2003/08/13 11:36:00 CDT
397    Tag: dbm-20030813-mcz-merge1
398    Description:
399    
400    Merging changes from the mcz-branch development branch into trunk.
401    These changes involve replacement of the emulated old prettyprinter
402    interface with direct use of the SML/NJ Lib PP library, and fixing
403    of a couple of bugs (895, 1186) relating to error messages.  A new
404    prettyprinter for ast datatypes (Elaborator/print/ppast.{sig,sml})
405    has been added.
406    
407    ----------------------------------------------------------------------
408    Name: Matthias Blume (blume (at) tti - c (dot) org)
409    Date: 2003/08/11 15:45:00 CDT
410    Tag: blume-20030811-windows
411    Description:
412    
413    Version number bumped to 110.42.9.  NEW BOOTFILES!!!
414    
415        http://smlnj.cs.uchicago.edu/dist/working/110.42.9/
416    
417    This patch restores SML/NJ's ability to run under win32.  There are a
418    number of changes, including fixes for several bugs that had gone
419    unnoticed until now:
420    
421      - uname "CYGWIN_NT*" is recognized as win32 (This is relevant only when
422        trying to run the win32 version from within cygwin.)
423    
424      - There are a number of simple .bat scripts that substitute for their
425        corresponding Unix shell-scripts.  (See below.)
426    
427      - The internals of ml-build have been modified slightly.  The main
428        difference is that instead of calling ".link-sml" (or link-sml.bat)
429        using OS.Process.system, the ML process delegates this task back
430        to the script.  Otherwise problems arise in mixed environments such
431        as Cygwin where scripts look and work like Unix scripts, but
432        where OS.Process.system cannot run them.
433    
434      - In CM, the srcpath pickler used native pathname syntax -- which
435        is incorrect in the case of cross-compilation.  The new pickle format
436        is independent of platform-specific naming conventions.
437    
438      - Path configuration files (such as lib/pathconfig) can now choose
439        between native and standard syntax.  Placing a line of the form
440    
441            standard!
442    
443        into the file causes all subsequent paths to be interpreted using
444        CM standard pathname syntax (= Unix conventions); a line
445    
446            native!
447    
448        switches back to native style.  This was needed so that
449        path config files can be written portably, see src/system/pathconfig.
450    
451      - Runtime system:
452    
453          - win32-filesys.c:  get_file_time and set_file_time now
454            access modification time, not creation time.
455    
456          - I/O code made aware of new array representation.
457    
458          - Bug fixes in X86.prim.masm.
459    
460       - src/system/makeml made aware of win32. (For use under cygwin
461            and other Unix-environments for windows.)
462    
463       - In Basis, fixed off-by-one error in win32-io.sml (function vecF)
464         which caused BinIO.inputAll to fail consistently.
465    
466    .bat scripts:
467    
468       Windows .bat scripts assume that SMLNJ_HOME is defined.
469    
470       - sml.bat, ml-yacc.bat, ml-lex.bat:  Driver scripts for standalone
471         applications (sml, ml-yacc, ml-lex).
472       - ml-build.bat: analogous to ml-build.
473       - config\install.bat:  Analogous to config/install.sh.  This requires
474         that SMLNJ_HOME is set and that Microsoft Visual C is ready to use.
475         (nmake etc. must be on the path, and vcvars32 must have been run.)
476         Moreover, sources for ml-lex and ml-yacc need to exist under src,
477         and the bootfile hierarchy must have been unpacked under
478         sml.boot.x86-win32.
479         The script is very primitive and does a poor job at error checking.
480         It only installs the base system, ml-lex, and ml-yacc.  No other
481         libraries are being installed (i.e., you get only those that
482         are part of the compiler.)
483       - link-sml.bat:  analogous to .link-sml, but not currently used
484    
485    Unrelated bug fixes:
486    
487      - ml-nlffigen now exports structures ST_* corresponding to incomplete
488        types.
489      - Added getDevice to PP/src/pp-debug-fn.sml.  (Would not compile
490        otherwise.)
491    
492    ----------------------------------------------------------------------
493    Name: Dave MacQueen (macqueen@cs.uchicago.edu)
494    Date: 2003/06/17
495    Tag: macqueen-20030617-bug895
496    Description:
497    
498    Modified compiler/Elaborator/print/pptype.sml to fix bug 895.
499    Tag will be used for new development branch (mcz-branch) for
500    use by MacQueen, (Lucasz) Zairek, and (George) Cao at uchicago.
501    
502    ----------------------------------------------------------------------
503    Name: Matthias Blume (blume (at) tti - c (dot) org)
504    Date: 2003/05/27 16:55:00 CDT
505    Tag: blume-20030527-polyeq
506    Description:
507    
508    Tried to eliminated most cases of polymorphic equality.
509    
510    ----------------------------------------------------------------------
511    Name: Matthias Blume (blume (at) tti - c (dot) org)
512    Date: 2003/05/21 17:45:00 CDT
513    Tag: blume-20030517-complete
514    Description:
515    
516    Two changes:
517    
518      1. Added a flag for controlling whether non-exhaustive bindings will
519         be treated as errors (default is false).
520      2. Cleaned up the *entire* source tree so that CMB.make goes through
521         without a single non-exhaustive match- or bind warning.
522    
523    ----------------------------------------------------------------------
524    Name: Matthias Blume (blume (at) tti - c (dot) org)
525    Date: 2003/05/17 10:20:00 CDT
526    Tag: blume-20030517-absyn
527    Description:
528    
529    1. Added cases for IF, WHILE, ANDALSO, and ORELSE to Absyn.
530    
531       This mainly affects the quality of error messages.  However, some
532       of the code is now more straightforward than before. (Treatment of
533       the above four constructs in translate.sml is much simpler than
534       the "macro-expansion" that was going on before.  Plus, the mach-
535       compiler no longer gets invoked just to be able to compile an
536       if-expression.)
537    
538    2. The ErrorMsg.Error exception is now caught and absorbed by the
539       interactive loop.
540    
541    ----------------------------------------------------------------------
542    Name: Allen Leung
543    Date: 2003/05/16 13:05:00 CDT
544    Tag: leunga-20030516-cygwin-runtime
545    Description:
546    
547        Ported the runtime system to cygwin, which uses the unix
548    x86-unix bin files.  Missing/buggy features:
549    
550       o getnetbyname, getnetbyaddr: these functions seem to be missing in
551         the Cygwin library.
552       o Ctrl-C handling may be flaky.
553       o Windows system calls and Windows I/O are not supported.
554    
555       A new set of binfiles is located at:
556    
557         http://www.dorsai.org/~leunga/boot.x86-unix.tgz
558    
559       This is only needed for bootstrapping the cygwin version of smlnj.
560       Other x86 versions can use the existing binfiles.
561    
562    ----------------------------------------------------------------------
563    Name: Matthias Blume
564    Date: 2003/04/08 15:42:00 CDT
565    Tag: blume-20030408-listpair
566    Description:
567    
568    1. Added a target 'mlrisc' to installer.
569    
570    2. Added missing elements to structure ListPair.
571    
572    ----------------------------------------------------------------------
573    Name: Allen Leung
574    Date: 2003/01/07 10:40:00 EST
575    Tag: leunga-20030107-int-rem
576    Description:
577    
578    Fixed a bug in Int.rem(x,y) where y is a power of 2 on x86.
579    The arguments to the SUBL instruction were swapped.
580    
581    ----------------------------------------------------------------------
582    Name: Matthias Blume
583    Date: 2002/12/12 16:25:00 EST
584    Tag: blume-20021212-risc-ra
585    Description:
586    
587    Fixed a serious bug in the rewrite code for FP spilling/reloading that
588    sent the RA into an infinite loop when floating point registers get
589    spilled.  (Because of this bug, e.g., nucleic stopped compiling between
590    110.37 and 110.38.)
591    There was another set of potential problems related to the handling of
592    MLRISC annotations (but those did not yet cause real problems, apparently).
593    
594    ----------------------------------------------------------------------
595    Name: Matthias Blume
596    Date: 2002/12/06 22:40:00 EST
597    Tag: blume-20021206-cm-fileid
598    Description:
599    
600    Added a call of SrcPath.sync at the beginning of Parse.parse (in CM).
601    This fixes the problem of CM getting confused by files that suddenly
602    change their identity (e.g., by getting unlinked and recreated by some
603    text editor such as vi).  There might be a better/cheaper/cleaner way
604    of doing this, but for now this will have to do.
605    
606    ----------------------------------------------------------------------
607    Name: Matthias Blume
608    Date: 2002/10/28 09:50:00 EST
609    Tag: blume-20021028-typecheck
610    Description:
611    
612    Exported structure Typecheck from $smlnj/viscomp/core.cm.
613    
614    ----------------------------------------------------------------------
615    Name: Matthias Blume
616    Date: 2002/10/17 09:10:00 EDT
617    Tag: Release_110_42
618    Description:
619    
620    In good old tradition, there has been a slight hiccup so that we have
621    to patch 110.42 after the fact.   The old release tag has been replaced
622    (see below).
623    
624    The change solves a problem with two competing approaches the
625    configuration problem regarding MacOS 10.1 vs. MacOS 10.2 which got in
626    each other's way.
627    
628    This change only affects the runtime system code and the installer script.
629    (No new bootfiles.)
630    
631    ----------------------------------------------------------------------
632    Name: Matthias Blume
633    Date: 2002/10/16 12:00:00 EDT
634    Tag: Release_110_42_removed
635    Description:
636    
637    New working release.  New bootfiles.
638    
639    ----------------------------------------------------------------------
640    Name: Matthias Blume
641    Date: 2002/10/10 13:10:00 EDT
642    Tag: blume-20021010-ppc-divs
643    Description:
644    
645    The mltree operator DIVS must be implemented with an overflow check on
646    the PPC because the hardware indicates divide-by-zero using "overflow" as
647    well.
648    
649    ----------------------------------------------------------------------
650    Name: Matthias Blume
651    Date: 2002/07/23 11:45:00
652    Tag: blume-20020723-smlnj-home
653    Description:
654    
655    Sml now senses the SMLNJ_HOME environment variable.  If this is set,
656    then the bin dir is assumed to be in $SMLNJ_HOME/bin and (unless
657    CM_PATHCONFIG is also set), the path configuration file is assumed
658    to be in $SMLNJ_HOME/lib/pathconfig.  This way one can easily move
659    the entire tree to some other place and everything will "just work".
660    
661    (Companion commands such as ml-build and ml-makedepend also sense this
662    variable.)
663    
664    ----------------------------------------------------------------------
665    Name: Matthias Blume
666    Date: 2002/07/12 21:19:00 EDT
667    Tag: blume-20020712-liveness
668    Description:
669    
670    Exported two useful "step" functions from liveness module (MLRISC).
671    
672    ----------------------------------------------------------------------
673    Name: Matthias Blume
674    Date: 2002/07/05 16:00 EDT
675    Tag: Release_110_41
676    Description:
677    
678    New working release.  New bootfiles.
679    
680    ----------------------------------------------------------------------
681    Name: Matthias Blume
682    Date: 2002/07/05 10:25:00 EDT
683    Tag: blume-20020705-btimp
684    Description:
685    
686    Exported structure BTImp from $smlnj/viscomp/debugprof.cm so that
687    other clients can set up backtracing support.
688    
689    ----------------------------------------------------------------------
690    Name: Matthias Blume
691    Date: 2002/06/25 17:23:00 EDT
692    Tag: blume-20020625-fpmax
693    Description:
694    
695    Fixed a bug in translation of INLMAX (and INLMIN) for the floating-point
696    case.  (The sense of the isNaN test was reversed -- which made min and
697    max always return their first argument.)
698    
699    ----------------------------------------------------------------------
700    Name: Matthias Blume
701    Date: 2002/06/11
702    Tag: blume-20020611-unixpath
703    Description:
704    
705    Back-ported OS.Path.{from,to}UnixPath from idlbasis-devel branch.
706    
707    ----------------------------------------------------------------------
708    Name: Matthias Blume
709    Date: 2002/06/10 16:35:00 EDT
710    Tag: blume-20020610-ieeereal
711    Description:
712    
713    I back-ported my implementation of IEEEReal.fromString from the
714    idlbasis-devel branch so that we can test it.
715    
716    Another small change is that ppDec tries to give more information
717    than just "<sig>" in the case of functors.  However, this code is
718    broken in some mysterious way if the functor's body's signature
719    has not been declared by ascription but gets inferred from the
720    implementation.  This needs fixing...
721    
722    ----------------------------------------------------------------------
723    Name: Matthias Blume
724    Date: 2002/05/31
725    Tag: blume-20020531-btrace-mode
726    Description:
727    
728    Resurrected SMLofNJ.Internals.BTrace.mode.  (It accidentally fell by
729    the wayside when I switched over to using Controls everywhere.)
730    
731    ----------------------------------------------------------------------
732    Name: Lal George
733    Date: 2002/05/23 12:21:40 EDT
734    Tag: george-20020523-visual-labels
735    Description:
736    
737    Labels are now displayed in the graphical output to make
738    the fall-through and target blocks obvious.
739    
740    ----------------------------------------------------------------------
741    Name: Matthias Blume
742    Date: 2002/05/22 11:03:00 EDT
743    Tag: blume-20020522-shrink
744    Description:
745    
746    John tweaked yesterday's fix for 1131 to handle an out-of-memory
747    situation that comes up when allocating huge arrays.
748    
749    ----------------------------------------------------------------------
750    Name: Matthias Blume
751    Date: 2002/05/21 16:00:00 EDT
752    Tag: Release_110_40
753    Description:
754    
755    New working release (110.40).  New bootfiles.
756    
757    [Also: John Reppy fixed GC bug 1131.]
758    
759    ----------------------------------------------------------------------
760    Name: Matthias Blume
761    Date: 2002/05/21 12:35:00 EDT
762    Tag: blume-20020521-cmdoc
763    Description:
764    
765    CM documentation update.
766    
767    ----------------------------------------------------------------------
768    Name: Matthias Blume
769    Date: 2002/05/21 10:55:00 EDT
770    Tag: blume-20020521-misc
771    Description:
772    
773    - John tweaked runtime to be silent on heap export (except when
774      GC messages are on).
775    - I added a few more things (cross-compiling versions of CMB) to
776      config/preloads (as suggestions).
777    
778    ----------------------------------------------------------------------
779    Name: Matthias Blume
780    Date: 2002/05/20 22:25:00 EDT
781    Tag: blume-20020520-controls
782    Description:
783    
784    - Added ControlUtil structure to control-lib.cm.
785    - Use it throughout.
786    - Used Controls facility to define MLRISC controls (as opposed to
787      registering MLRISC control ref cells with Controls after the fact)
788    - Fixed messed-up controls priorities.
789    
790    * Removed again all the stuff from config/preloads that one wouldn't
791      be able to preload at the time the initial heap image is built.
792      (Many libraries, e.g., CML, do not exist yet at this time.  The
793       only libraries that can be preloaded via config/preloads are those
794       that come bundled with the bootfiles.)
795    
796    ----------------------------------------------------------------------
797    Name: Matthias Blume
798    Date: 2002/05/20 10:59:00 EDT
799    Tag: blume-20020520-preloads
800    Description:
801    
802    Added a lot of commented-out suggestions for things to be included
803    in config/preloads.
804    
805    ----------------------------------------------------------------------
806    Name: Allen Leung
807    Date: 2002/05/18 14:20:00 EDT
808    Tag: leunga-20020518-mdl
809    Description:
810    
811    o Made the mdl tool stuff compile and run again.
812    o I've disabled all the stuff that depends on RTL specifications; they
813      are all badly broken anyway.
814    
815    ----------------------------------------------------------------------
816    Name: Matthias Blume
817    Date: 2002/05/17 16:49:00 EDT
818    Tag: blume-20020517-controls
819    Description:
820    
821    0. John Reppy made several modifications to the SML/NJ library.
822       In particular, there is a shiny new controls-lib.cm.
823    
824    1. Pushed new controls interface through compiler so that everything
825       compiles again.
826    
827    2. Added FormatComb and FORMAT_COMB to the CML version of the
828       SML/NJ library (so that CML compiles again).
829    
830    3. Modified init scripts because XXX_DEFAULT environment variables
831       are no longer with us.  (Boot-time initialization is now done
832       using the same environment variables that are also used for
833       startup-time initialization of controls.)
834    
835    ----------------------------------------------------------------------
836    Name: Lal George
837    Date: 2002/05/15 09:20:10 EDT
838    Tag: george-20020515-pseudo-op-decls
839    Description:
840    
841            All pseudo-ops emitted before the first segment declaration
842    such as TEXT, DATA, and BSS directives are assumed to be global
843    declarations and are emitted first in the assembly file. This is
844    useful in a number of situations where one has pseudo-ops that are not
845    specific to any segment, and also works around the constraint that one
846    cannot have client pseudo-ops in the TEXT segment.
847    
848            Because no segment is associated with these declarations it is
849    an error to allocate any space or objects before the first segment
850    directive and an exception will be raised. However, we cannot make
851    this check for client pseudo-ops.
852    
853            These top level declarations are a field in the CFG graph_info.
854    In theory you can continue to add to this field after the CFG has been
855    built -- provided you know what you are doing;-)
856    
857    ----------------------------------------------------------------------
858    Name: Matthias Blume
859    Date: 2002/05/13 16:40:00 EDT
860    Tag: blume-20020513-pp-etc
861    Description:
862    
863    A few minor bugfixes:
864    
865      - Stopgap measure for bug recently reported by Elsa Gunter (ppDec).
866        (Bogus printouts for redefined bindings still occur.  Compiler
867        bug should no longer occur now.  We need to redo the prettyprinter
868        from scratch.)
869    
870      - CM pathname printer now also adds escape sequences for ( and )
871    
872      - commend and docu fixes for ml-nlffi
873    
874    ----------------------------------------------------------------------
875    Name: Matthias Blume
876    Date: 2002/05/10 16:40:00 EDT
877    Tag: blume-20020510-erg-textio
878    Description:
879    
880    Applied the following bugfix provided by Emden Gansner:
881    
882        Output is corrupted when outputSubstr is used rather than output.
883    
884        The problem occurs when a substring
885    
886            ss = (s, dataStart, dataLen)
887    
888        where dataStart > 0, fills a stream buffer with avail bytes left.
889        avail bytes of s, starting at index dataStart, are copied into the
890        buffer, the buffer is flushed, and then the remaining dataLen-avail
891        bytes of ss are copied into the beginning of the buffer. Instead of
892        starting this copy at index dataStart+avail in s, the current code
893        starts the copy at index avail.
894    
895        Fix:
896        In text-io-fn.sml, change line 695 from
897             val needsFlush = copyVec(v, avail, dataLen-avail, buf, 0)
898        to
899             val needsFlush = copyVec(v, dataStart+avail, dataLen-avail, buf, 0)
900    
901    ----------------------------------------------------------------------
902    Name: Matthias Blume
903    Date: 2002/04/12 13:55:00 EDT
904    Tag: blume-20020412-assyntax
905    Description:
906    
907    1. Grabbed newer assyntax.h from the XFree86 project.
908    2. Fiddled with how to compile X86.prim.asm without warnings.
909    3. (Very) Minor cleanup in CM.
910    
911    ----------------------------------------------------------------------
912    Name: Matthias Blume
913    Date: 2002/04/01 (no joke!) 17:07:00 EST
914    Tag: blume-20020401-x86div
915    Description:
916    
917    Added full support for div/mod/rem/quot on the x86, using the machine
918    instruction's two results (without clumsily recomputing the remainder)
919    directly where appropriate.
920    
921    Some more extensive power-of-two support was added to the x86 instruction
922    selector (avoiding expensive divs, mods, and muls where they can be
923    replaced with cheaper shifts and masks).  However, this sort of thing
924    ought to be done earlier, e.g., within the CPS optimizer so that
925    all architectures benefit from it.
926    
927    The compiler compiles to a fixed point, but changes might be somewhat
928    fragile nevertheless.  Please, report any strange things that you might
929    see wrt. div/mod/quot/rem...
930    
931    ----------------------------------------------------------------------
932    Name: Matthias Blume
933    Date: 2002/03/29 17:22:00
934    Tag: blume-20020329-div
935    Description:
936    
937    Fixed my broken div/mod logic.  Unfortunately, this means that the
938    inline code for div/mod now has one more comparison than before.
939    Fast paths (quotient > 0 or remainder = 0) are not affected, though.
940    The problem was with quotient = 0, because that alone does not tell
941    us which way the rounding went.  One then has to look at whether
942    remainder and divisor have the same sign...  :(
943    
944    Anyway, I replaced the bootfiles with fresh ones...
945    
946    ----------------------------------------------------------------------
947    Name: Matthias Blume
948    Date: 2002/03/29 14:10:00 EST
949    Tag: blume-20020329-inlprims
950    Description:
951    
952    NEW BOOTFILES!!!    Version number bumped to 110.39.3.
953    
954    Primops have changed. This means that the bin/boot-file formats have
955    changed as well.
956    
957    To make sure that there is no confusion, I made a new version.
958    
959    
960    CHANGES:
961    
962    * removed REMT from mltree (remainder should never overflow).
963    
964    * added primops to deal with divisions of all flavors to the frontend
965    
966    * handled these primops all the way through so they map to their respective
967      MLRISC support
968    
969    * used these primops in the implementation of Int, Int32, Word, Word32
970    
971    * removed INLDIV, INLMOD, and INLREM as they are no longer necessary
972    
973    * parameterized INLMIN, INLMAX, and INLABS by a numkind
974    
975    * translate.sml now deals with all flavors of INL{MIN,MAX,ABS}, including
976      floating point
977    
978    * used INL{MIN,MAX,ABS} in the implementation of Int, Int32, Word, Word32,
979      and Real (but Real.abs maps to a separate floating-point-only primop)
980    
981    
982    TODO items:
983    
984    * Hacked Alpha32 instruction selection, disabling the selection of REMx
985      instructions because the machine instruction encoder cannot handle
986      them.  (Hppa, PPC, and Sparc instruction selection did not handle
987      REM in the first place, and REM is supported by the x86 machine coder.)
988    
989    * Handle DIV and MOD with DIV_TO_NEGINF directly in the x86 instruction
990      selection phase.  (The two can be streamlined because the hardware
991      delivers both quotient and remainder at the same time anyway.)
992    
993    * Think about what to do with "valOf(Int32.minInt) div ~1" and friends.
994      (Currently the behavior is inconsistent both across architectures and
995      wrt. the draft Basis spec.)
996    
997    * Word8 should eventually be handled natively, too.
998    
999    * There seems to be one serious bug in mltree-gen.sml.  It appears, though,
1000      as if there currently is no execution path that could trigger it in
1001      SML/NJ.  (The assumptions underlying functions arith and promotable do not
1002      hold for things like multiplication and division.)
1003    
1004    ----------------------------------------------------------------------
1005    Name: Matthias Blume
1006    Date: 2002/03/27 16:27:00 EST
1007    Tag: blume-20020327-mlrisc-divisions
1008    Description:
1009    
1010    Added support for all four division operations (ML's div, mod, quot,
1011    and rem) to MLRISC.  In the course of doing so, I also rationalized
1012    the naming (no more annoying switch-around of DIV and QUOT), by
1013    parameterizing the operation by div_rounding_mode (which can be either
1014    DIV_TO_ZERO or DIV_TO_NEGINF).
1015    
1016    The generic MLTreeGen functor takes care of compiling all four
1017    operations down to only round-to-zero div.
1018    
1019    Missing pieces:
1020    
1021      * Doing something smarter than relying on MLTreeGen on architectures
1022        like, e.g., the x86 where hardware division delivers both quotient and
1023        remainder at the same time.  With this, the implementation of the
1024        round-to-neginf operations could be further streamlined.
1025    
1026      * Remove inlining support for div/mod/rem from the frontend and replace it
1027        with primops that get carried through to the backend.  Do this for all
1028        int and word types.
1029    
1030    ----------------------------------------------------------------------
1031    Name: Matthias Blume
1032    Date: 2002/03/25 17:25:00 EST
1033    Tag: blume-20020325-divmod
1034    Description:
1035    
1036    I improved (hopefully without breaking them) the implementation of Int.div,
1037    Int.mod, and Int.rem.   For this, the code in translate.sml now takes
1038    advantage of the following observations:
1039    
1040      Let  q = x quot y      r = x rem y
1041           d = x div  y      m = x mod y
1042    
1043    where "quot" is the round-to-zero version of integer division that
1044    hardware usually provides.  Then we have:
1045    
1046         r = x - q * y        where neither the * nor the - will overflow
1047         d = if q >= 0 orelse x = q * y then q else q - 1
1048                              where neither the * nor the - will overflow
1049         m = if q >= 0 orelse r = 0 then r else r + y
1050                              where the + will not overflow
1051    
1052    This results in substantial simplification of the generated code.
1053    The following table shows the number of CFG nodes and edges generated
1054    for
1055            fun f (x, y) = x OPER y
1056            (* with OPER \in div, mod, quot, rem *)
1057    
1058    
1059        OPER | nodes(old) | edges(old) | nodes(new) | edges(new)
1060        --------------------------------------------------------
1061         div |         24 |         39 |         12 |         16
1062         mod |         41 |         71 |         12 |         16
1063        quot |          8 |         10 |          8 |         10
1064         rem |         10 |         14 |          8 |         10
1065    
1066    
1067    ----------------------------------------------------------------------
1068    Name: Matthias Blume
1069    Date: 2002/03/25 22:06:00 EST
1070    Tag: blume-20020325-cprotobug
1071    Description:
1072    
1073    Fixed a bug in cproto (c prototype decoder).
1074    
1075    ----------------------------------------------------------------------
1076    Name: Matthias Blume
1077    Date: 2002/03/25 16:00:00 EST
1078    Tag: blume-20020325-raw-primops
1079    Description:
1080    
1081    I did some cleanup to Allen's new primop code and
1082    replaced yesterday's bootfiles with new ones.
1083    (But they are stored in the same place.)
1084    
1085    ----------------------------------------------------------------------
1086    Name: Matthias Blume
1087    Date: 2002/03/24 22:40:00 EST
1088    Tag: blume-20020324-bootfiles
1089    Description:
1090    
1091    Made the bootfiles that Allen asked for.
1092    
1093    ----------------------------------------------------------------------
1094    Name: Allen Leung
1095    Date: 2002/03/23 15:50:00 EST
1096    Tag: leunga-20020323-flint-cps-rcc-primops
1097    Description:
1098    
1099      1. Changes to FLINT primops:
1100    
1101        (* make a call to a C-function;
1102         * The primop carries C function prototype information and specifies
1103         * which of its (ML-) arguments are floating point. C prototype
1104         * information is for use by the backend, ML information is for
1105         * use by the CPS converter. *)
1106      | RAW_CCALL of { c_proto: CTypes.c_proto,
1107                       ml_args: ccall_type list,
1108                       ml_res_opt: ccall_type option,
1109                       reentrant : bool
1110                     } option
1111       (* Allocate uninitialized storage on the heap.
1112        * The record is meant to hold short-lived C objects, i.e., they
1113        * are not ML pointers.  With the tag, the representation is
1114        * the same as RECORD with tag tag_raw32 (sz=4), or tag_fblock (sz=8)
1115        *)
1116      | RAW_RECORD of {tag:bool,sz:int}
1117      and ccall_type = CCALL_INT32 | CCALL_REAL64 | CCALL_ML_PTR
1118    
1119      2.  These CPS primops are now overloaded:
1120    
1121           rawload of {kind:numkind}
1122           rawstore of {kind:numkind}
1123    
1124          The one argument form is:
1125    
1126             rawload {kind} address
1127    
1128          The two argument form is:
1129    
1130             rawload {kind} [ml object, byte-offset]
1131    
1132      3. RAW_CCALL/RCC now takes two extra arguments:
1133    
1134         a. The first is whether the C call is reentrant, i.e., whether
1135            ML state should be saved and restored.
1136         b. The second argument is a string argument specifying the name of
1137            library and the C function.
1138    
1139         These things are currently not handled in the code generator, yet.
1140    
1141      4. In CProto,
1142    
1143         An encoding type of "bool" means "ml object" and is mapped into
1144         C prototype of PTR.  Note that "bool" is different than "string",
1145         even though "string" is also mapped into PTR, because "bool"
1146         is assigned an CPS type of BOGt, while "string" is assigned INT32t.
1147    
1148      5. Pickler/unpicker
1149    
1150         Changed to handle RAW_RECORD and newest RAW_CCALL
1151    
1152      6. MLRiscGen,
1153    
1154         1. Changed to handle the new rawload/rawstore/rawrecord operators.
1155         2. Code for handling C Calls has been moved to a new module CPSCCalls,
1156            in the file CodeGen/cpscompile/cps-c-calls.sml
1157    
1158      7. Added the conditional move operator
1159    
1160             condmove of branch
1161    
1162         to cps.  Generation of this is still buggy so it is currently
1163         disabled.
1164    
1165    ----------------------------------------------------------------------
1166    Name: Lal George
1167    Date: 2002/03/22 14:18:25 EST
1168    Tag: george-20020322-cps-branch-prob
1169    Description:
1170    
1171    Implemented the Ball-Larus branch prediction-heuristics, and
1172    incorporated graphical viewers for control flow graphs.
1173    
1174    Ball-Larus Heuristics:
1175    ---------------------
1176    See the file compiler/CodeGen/cpscompile/cpsBranchProb.sml.
1177    
1178    By design it uses the Dempster-Shafer theory for combining
1179    probabilities.  For example, in the function:
1180    
1181        fun f(n,acc) = if n = 0 then acc else f(n-1, n*acc)
1182    
1183    the ball-larus heuristics predicts that the n=0 is unlikely
1184    (OH-heuristic), and the 'then' branch is unlikely because of the
1185    RH-heuristic -- giving the 'then' branch an even lower combined
1186    probability using the Dempster-Shafer theory.
1187    
1188    Finally, John Reppy's loop analysis in MLRISC, further lowers the
1189    probability of the 'then' branch because of the loop in the else
1190    branch.
1191    
1192    
1193    Graphical Viewing:
1194    ------------------
1195    I merely plugged in Allen's graphical viewers into the compiler. The
1196    additional code is not much. At the top level, saying:
1197    
1198            Control.MLRISC.getFlag "cfg-graphical-view" := true;
1199    
1200    will display the graphical view of the control flow graph just before
1201    back-patching.  daVinci must be in your path for this to work. If
1202    daVinci is not available, then the default viewer can be changed
1203    using:
1204    
1205            Control.MLRISC.getString "viewer"
1206    
1207    which can be set to "dot" or "vcg" for the corresponding viewers. Of
1208    course, these viewers must be in your path.
1209    
1210    The above will display the compilation unit at the level of clusters,
1211    many of which are small, boring, and un-interesting. Also setting:
1212    
1213            Control.MLRISC.getInt "cfg-graphical-view_size"
1214    
1215    will display clusters that are larger than the value set by the above.
1216    
1217    
1218    ----------------------------------------------------------------------
1219    Name: Matthias Blume
1220    Date: 2002/03/21 22:20:00 EST
1221    Tag: blume-20020321-kmp-bugfix
1222    Description:
1223    
1224    Changed the interface to the KMP routine in PreString and fixed
1225    a minor bug in one place where it was used.
1226    
1227    ----------------------------------------------------------------------
1228    Name: Allen Leung
1229    Date: 2002/03/21 20:30:00 EST
1230    Tag: leunga-20020321-cfg
1231    Description:
1232    
1233      Fixed a potential problem in cfg edge splitting.
1234    
1235    ----------------------------------------------------------------------
1236    Name: Allen Leung
1237    Date: 2002/03/21 17:15:00 EST
1238    Tag: leunga-20020321-x86-fp-cfg
1239    Description:
1240    
1241      1. Recoded the buggy parts of x86-fp.
1242    
1243         a. All the block reordering code has been removed.
1244            We now depend on the block placement phases to do this work.
1245    
1246         b. Critical edge splitting code has been simplified and moved into the
1247            CFG modules, as where they belong.
1248    
1249         Both of these were quite buggy and complex.  The code is now much, much
1250         simpler.
1251    
1252      2. X86 backend.
1253    
1254         a. Added instructions for 64-bit support.  Instruction selection for
1255            64-bit has not been committed, however, since that
1256            requires changes to MLTREE which haven't been approved by
1257            Lal and John.
1258    
1259         b. Added support for FUCOMI and FUCOMIP when generating code for
1260            PentiumPro and above.  We only generate these instructions in
1261            the fast-fp mode.
1262    
1263         c. Added cases for JP and JNP in X86FreqProps.
1264    
1265      3. CFG
1266    
1267         CFG now has a bunch of methods for edge splitting and merging.
1268    
1269      4. Machine description.
1270    
1271         John's simplification of MLTREE_BASIS.fcond broke a few machine
1272         description things:
1273    
1274         rtl-build.{sig,sml} and hppa.mdl fixed.
1275    
1276         NOTE: the machine description stuff in the repository is still broken.
1277               Again, I can't put my fixes in because that involves
1278               changes to MLTREE.
1279    
1280    ----------------------------------------------------------------------
1281    Name: Matthias Blume
1282    Date: 2002/03/20 15:55:00 EST
1283    Tag: blume-20020320-kmp
1284    Description:
1285    
1286    Implemented Knuth-Morris-Pratt string matching in PreString and used
1287    it for String.isSubstring, Substring.isSubstring, and
1288    Substring.position.
1289    
1290    (Might need some stress-testing.  Simple examples worked fine.)
1291    
1292    ----------------------------------------------------------------------
1293    Name: Matthias Blume
1294    Date: 2002/03/19 16:37:00 EST
1295    Tag: blume-20020319-witnesses
1296    Description:
1297    
1298    Added a structure C.W and functions convert/Ptr.convert to ml-nlffi-lib.
1299    
1300    This implements a generic mechanism for changing constness qualifiers
1301    anywhere within big C types without resorting to outright "casts".
1302    (So far, functions such as C.rw/C.ro or C.Ptr.rw/C.Ptr.ro only let you
1303    modify the constness at the outermost level.)
1304    The implementation of "convert" is based on the idea of "witness"
1305    values -- values that are not used by the operation but whose types
1306    "testify" to their applicability.  On the implementation side, "convert"
1307    is simply a projection (returning its second curried argument).  With
1308    cross-module inlining, it should not result in any machine code being
1309    generated.
1310    
1311    ----------------------------------------------------------------------
1312    Name: Matthias Blume
1313    Date: 2002/03/15 16:40:00 EST
1314    Tag: blume-20020315-basis
1315    Description:
1316    
1317    Provided (preliminary?) implementations for
1318    
1319      {String,Substring}.{concatWith,isSuffix,isSubstring}
1320    
1321    and
1322    
1323      Substring.full
1324    
1325    Those are in the Basis spec but they were missing in SML/NJ.
1326    
1327    ----------------------------------------------------------------------
1328    Name: Matthias Blume
1329    Date: 2002/03/14 21:30:00 EST
1330    Tag: blume-20020314-controls
1331    Description:
1332    
1333    Controls:
1334    ---------
1335    
1336    1. Factored out the recently-added Controls : CONTROLS stuff and put
1337       it into its own library $/controls-lib.cm.  The source tree for
1338       this is under src/smlnj-lib/Controls.
1339    
1340    2. Changed the names of types and functions in this interface, so they
1341       make a bit more "sense":
1342    
1343          module -> registry
1344          'a registry -> 'a group
1345    
1346    3. The interface now deals in ref cells only.  The getter/setter interface
1347       is (mostly) gone.
1348    
1349    4. Added a function that lets one register an already-existing ref cell.
1350    
1351    5. Made the corresponding modifications to the rest of the code so that
1352       everything compiles again.
1353    
1354    6. Changed the implementation of Controls.MLRISC back to something closer
1355       to the original.  In particular, this module (and therefore MLRISC)
1356       does not depend on Controls.  There now is some link-time code in
1357       int-sys.sml that registers the MLRISC controls with the Controls
1358       module.
1359    
1360    CM:
1361    ---
1362    
1363      * One can now specify the lambda-split aggressiveness in init.cmi.
1364    
1365    ----------------------------------------------------------------------
1366    Name: Allen Leung
1367    Date: 2002/03/13 17:30:00 EST
1368    Tag: leunga-20020313-x86-fp-unary
1369    Description:
1370    
1371    Bug fix for:
1372    
1373    > leunga@weaselbane:~/Yale/tmp/sml-dist{21} bin/sml
1374    > Standard ML of New Jersey v110.39.1 [FLINT v1.5], March 08, 2002
1375    > - fun f(x,(y,z)) = Real.~ y;
1376    > [autoloading]
1377    > [autoloading done]
1378    >       fchsl   (%eax), 184(%esp)
1379    > Error: MLRisc bug: X86MCEmitter.emitInstr
1380    >
1381    > uncaught exception Error
1382    >   raised at: ../MLRISC/control/mlriscErrormsg.sml:16.14-16.19
1383    
1384    The problem was that the code generator did not generate any fp registers
1385    in this case, and the ra didn't know that it needed to run the X86FP phase to
1386    translate the pseudo fp instruction.   This only happened with unary fp
1387    operators in certain situations.
1388    
1389    ----------------------------------------------------------------------
1390    Name: Matthias Blume
1391    Date: 2002/03/13 14:00:00 EST
1392    Tag: blume-20020313-overload-etc
1393    Description:
1394    
1395    1. Added _overload as a synonym for overload for backward compatibility.
1396       (Control.overloadKW must be true for either version to be accepted.)
1397    
1398    2. Fixed bug in install script that caused more things to be installed
1399       than what was requested in config/targets.
1400    
1401    3. Made CM aware of the (_)overload construct so that autoloading
1402       works.
1403    
1404    ----------------------------------------------------------------------
1405    Name: Matthias Blume
1406    Date: 2002/03/12 22:03:00 EST
1407    Tag: blume-20020312-url
1408    Description:
1409    
1410    Forgot to update BOOT and srcarchiveurl.
1411    
1412    ----------------------------------------------------------------------
1413    Name: Matthias Blume
1414    Date: 2002/03/12 17:30:00 EST
1415    Tag: blume-20020312-version110392
1416    Description:
1417    
1418    Yet another version number bump (because of small changes to the
1419    binfile format).  Version number is now 110.39.2.  NEW BOOTFILES!
1420    
1421    Changes:
1422    
1423      The new pid generation scheme described a few weeks ago was overly
1424      complicated.  I implemented a new mechanism that is simpler and
1425      provides a bit more "stability":  Once CM has seen a compilation
1426      unit, it keeps its identity constant (as long as you do not delete
1427      those crucial CM/GUID/* files).  This means that when you change
1428      an interface, compile, then go back to the old interface, and
1429      compile again, you arrive at the original pid.
1430    
1431      There now also is a mechanism that instructs CM to use the plain
1432      environment hash as a module's pid (effectively making its GUID
1433      the empty string).  For this, "noguid" must be specified as an
1434      option to the .sml file in question within its .cm file.
1435      This is most useful for code that is being generated by tools such
1436      as ml-nlffigen (because during development programmers tend to
1437      erase the tool's entire output directory tree including CM's cached
1438      GUIDs).  "noguid" is somewhat dangerous (since it can be used to locally
1439      revert to the old, broken behavior of SML/NJ, but in specific cases
1440      where there is no danger of interface confusion, its use is ok
1441      (I think).
1442    
1443      ml-nlffigen by default generates "noguid" annotations.  They can be
1444      turned off by specifying -guid in its command line.
1445    
1446    ----------------------------------------------------------------------
1447    Name: Lal George
1448    Date: 2002/03/12 12 14:42:36 EST
1449    Tag: george-20020312-frequency-computation
1450    Description:
1451    
1452    Integrated jump chaining and static block frequency into the
1453    compiler. More details and numbers later.
1454    
1455    ----------------------------------------------------------------------
1456    Name: Lal George
1457    Date: 2002/03/11 11 22:38:53 EST
1458    Tag: george-20020311-jump-chain-elim
1459    Description:
1460    
1461    Tested the jump chain elimination on all architectures (except the
1462    hppa).  This is on by default right now and is profitable for the
1463    alpha and x86, however, it may not be profitable for the sparc and ppc
1464    when compiling the compiler.
1465    
1466    The gc test will typically jump to a label at the end of the cluster,
1467    where there is another jump to an external cluster containing the actual
1468    code to invoke gc. This is to allow factoring of common gc invocation
1469    sequences. That is to say, we generate:
1470    
1471            f:
1472               testgc
1473               ja   L1      % jump if above to L1
1474    
1475            L1:
1476               jmp L2
1477    
1478    
1479    After jump chain elimination the 'ja L1' instructions is converted to
1480    'ja L2'. On the sparc and ppc, many of the 'ja L2' instructions may end
1481    up being implemented in their long form (if L2 is far away) using:
1482    
1483            jbe     L3      % jump if below or equal to L3
1484            jmp     L2
1485         L3:
1486            ...
1487    
1488    
1489    For large compilation units L2  may be far away.
1490    
1491    
1492    ----------------------------------------------------------------------
1493    Name: Matthias Blume
1494    Date: 2002/03/11 13:30:00 EST
1495    Tag: blume-20020311-mltreeeval
1496    Description:
1497    
1498    A functor parameter was missing.
1499    
1500    ----------------------------------------------------------------------
1501    Name: Allen Leung
1502    Date: 2002/03/11 10:30:00 EST
1503    Tag: leunga-20020311-runtime-string0
1504    Description:
1505    
1506       The representation of the empty string now points to a
1507    legal null terminated C string instead of unit.  It is now possible
1508    to convert an ML string into C string with InlineT.CharVector.getData.
1509    This compiles into one single machine instruction.
1510    
1511    ----------------------------------------------------------------------
1512    Name: Allen Leung
1513    Date: 2002/03/10 23:55:00 EST
1514    Tag: leunga-20020310-x86-call
1515    Description:
1516    
1517       Added machine generation for CALL instruction (relative displacement mode)
1518    
1519    ----------------------------------------------------------------------
1520    Name: Matthias Blume
1521    Date: 2002/03/08 16:05:00
1522    Tag: blume-20020308-entrypoints
1523    Description:
1524    
1525    Version number bumped to 110.39.1.  NEW BOOTFILES!
1526    
1527    Entrypoints: non-zero offset into a code object where execution should begin.
1528    
1529    - Added the notion of an entrypoint to CodeObj.
1530    - Added reading/writing of entrypoint info to Binfile.
1531    - Made runtime system bootloader aware of entrypoints.
1532    - Use the address of the label of the first function given to mlriscGen
1533      as the entrypoint.  This address is currently always 0, but it will
1534      not be 0 once we turn on block placement.
1535    - Removed the linkage cluster code (which was The Other Way(tm) of dealing
1536      with entry points) from mlriscGen.
1537    
1538    ----------------------------------------------------------------------
1539    Name: Allen Leung
1540    Date: 2002/03/07 20:45:00 EST
1541    Tag: leunga-20020307-x86-cmov
1542    Description:
1543    
1544       Bug fixes for CMOVcc on x86.
1545    
1546       1. Added machine code generation for CMOVcc
1547       2. CMOVcc is now generated in preference over SETcc on PentiumPro or above.
1548       3. CMOVcc cannot have an immediate operand as argument.
1549    
1550    ----------------------------------------------------------------------
1551    Name: Matthias Blume
1552    Date: 2002/03/07 16:15:00 EST
1553    Tag: blume-20020307-controls
1554    Description:
1555    
1556    This is a very large but mostly boring patch which makes (almost)
1557    every tuneable compiler knob (i.e., pretty much everything under
1558    Control.* plus a few other things) configurable via both the command
1559    line and environment variables in the style CM did its configuration
1560    until now.
1561    
1562    Try starting sml with '-h' (or, if you are brave, '-H')
1563    
1564    To this end, I added a structure Controls : CONTROLS to smlnj-lib.cm which
1565    implements the underlying generic mechanism.
1566    
1567    The interface to some of the existing such facilities has changed somewhat.
1568    For example, the MLRiscControl module now provides mkFoo instead of getFoo.
1569    (The getFoo interface is still there for backward-compatibility, but its
1570    use is deprecated.)
1571    
1572    The ml-build script passes -Cxxx=yyy command-line arguments through so
1573    that one can now twiddle the compiler settings when using this "batch"
1574    compiler.
1575    
1576    TODO items:
1577    
1578    We should go through and throw out all controls that are no longer
1579    connected to anything.  Moreover, we should go through and provide
1580    meaningful (and correct!) documentation strings for those controls
1581    that still are connected.
1582    
1583    Currently, multiple calls to Controls.new are accepted (only the first
1584    has any effect).  Eventually we should make sure that every control
1585    is being made (via Controls.new) exactly once.  Future access can then
1586    be done using Controls.acc.
1587    
1588    Finally, it would probably be a good idea to use the getter-setter
1589    interface to controls rather than ref cells.  For the time being, both
1590    styles are provided by the Controls module, but getter-setter pairs are
1591    better if thread-safety is of any concern because they can be wrapped.
1592    
1593    *****************************************
1594    
1595    One bug fix: The function blockPlacement in three of the MLRISC
1596    backpatch files used to be hard-wired to one of two possibilities at
1597    link time (according to the value of the placementFlag).  But (I
1598    think) it should rather sense the flag every time.
1599    
1600    *****************************************
1601    
1602    Other assorted changes (by other people who did not supply a HISTORY entry):
1603    
1604    1. the cross-module inliner now works much better (Monnier)
1605    2. representation of weights, frequencies, and probabilities in MLRISC
1606       changed in preparation of using those for weighted block placement
1607       (Reppy, George)
1608    
1609    ----------------------------------------------------------------------
1610    Name: Lal George
1611    Date: 2002/03/07 14:44:24 EST 2002
1612    Tag: george-20020307-weighted-block-placement
1613    
1614    Tested the weighted block placement optimization on all architectures
1615    (except the hppa) using AMPL to generate the block and edge frequencies.
1616    Changes were required in the machine properties to correctly
1617    categorize trap instructions. There is an MLRISC flag
1618    "weighted-block-placement" that can be used to enable weighted block
1619    placement, but this will be ineffective without block/edge
1620    frequencies (coming soon).
1621    
1622    
1623    ----------------------------------------------------------------------
1624    Name: Lal George
1625    Date: 2002/03/05 17:24:48 EST
1626    Tag: george-20020305-linkage-cluster
1627    
1628    In order to support the block placement optimization, a new cluster
1629    is generated as the very first cluster (called the linkage cluster).
1630    It contains a single jump to the 'real' entry point for the compilation
1631    unit. Block placement has no effect on the linkage cluster itself, but
1632    all the other clusters  have full freedom in the manner in which they
1633    reorder blocks or functions.
1634    
1635    On the x86 the typical linkage code that is generated is:
1636       ----------------------
1637            .align 2
1638       L0:
1639            addl    $L1-L0, 72(%esp)
1640            jmp     L1
1641    
1642    
1643            .align  2
1644       L1:
1645       ----------------------
1646    
1647    72(%esp) is the memory location for the stdlink register. This
1648    must contain the address of the CPS function being called. In the
1649    above example, it contains the address of  L0; before
1650    calling L1 (the real entry point for the compilation unit), it
1651    must contain the address for L1, and hence
1652    
1653            addl $L1-L0, 72(%esp)
1654    
1655    I have tested this on all architectures except the hppa.The increase
1656    in code size is of course negligible
1657    
1658    ----------------------------------------------------------------------
1659    Name: Allen Leung
1660    Date: 2002/03/03 13:20:00 EST
1661    Tag: leunga-20020303-mlrisc-tools
1662    
1663      Added #[ ... ] expressions to mlrisc tools
1664    
1665    ----------------------------------------------------------------------
1666    Name: Matthias Blume
1667    Date: 2002/02/27 12:29:00 EST
1668    Tag: blume-20020227-cdebug
1669    Description:
1670    
1671    - made types in structure C and C_Debug to be equal
1672    - got rid of code duplication (c-int.sml vs. c-int-debug.sml)
1673    - there no longer is a C_Int_Debug (C_Debug is directly derived from C)
1674    
1675    ----------------------------------------------------------------------
1676    Name: Matthias Blume
1677    Date: 2002/02/26 12:00:00 EST
1678    Tag: blume-20020226-ffi
1679    Description:
1680    
1681    1. Fixed a minor bug in CM's "noweb" tool:
1682       If numbering is turned off, then truly don't number (i.e., do not
1683       supply the -L option to noweb).  The previous behavior was to supply
1684       -L'' -- which caused noweb to use the "default" line numbering scheme.
1685       Thanks to Chris Richards for pointing this out (and supplying the fix).
1686    
1687    2. Once again, I reworked some aspects of the FFI:
1688    
1689       A. The incomplete/complete type business:
1690    
1691       - Signatures POINTER_TO_INCOMPLETE_TYPE and accompanying functors are
1692         gone!
1693       - ML types representing an incomplete type are now *equal* to
1694         ML types representing their corresponding complete types (just like
1695         in C).  This is still safe because ml-nlffigen will not generate
1696         RTTI for incomplete types, nor will it generate functions that
1697         require access to such RTTI.   But when ML code generated from both
1698         incomplete and complete versions of the C type meet, the ML types
1699         are trivially interoperable.
1700    
1701         NOTE:  These changes restore the full generality of the translation
1702         (which was previously lost when I eliminated functorization)!
1703    
1704       B. Enum types:
1705    
1706       - Structure C now has a type constructor "enum" that is similar to
1707         how the "su" constructor works.  However, "enum" is not a phantom
1708         type because each "T enum" has values (and is isomorphic to
1709         MLRep.Signed.int).
1710       - There are generic access operations for enum objects (using
1711         MLRep.Signed.int).
1712       - ml-nlffigen will generate a structure E_foo for each "enum foo".
1713         * The structure contains the definition of type "mlrep" (the ML-side
1714         representation type of the enum).  Normally, mlrep is the same
1715         as "MLRep.Signed.int", but if ml-nlffigen was invoked with "-ec",
1716         then mlrep will be defined as a datatype -- thus facilitating
1717         pattern matching on mlrep values.
1718         ("-ec" will be suppressed if there are duplicate values in an
1719          enumeration.)
1720         * Constructors ("-ec") or values (no "-ec") e_xxx of type mlrep
1721         will be generated for each C enum constant xxx.
1722         * Conversion functions m2i and i2m convert between mlrep and
1723         MLRep.Signed.int.  (Without "-ec", these functions are identities.)
1724         * Coversion functions c and ml convert between mlrep and "tag enum".
1725         * Access functions (get/set) fetch and store mlrep values.
1726       - By default (unless ml-nlffigen was invoked with "-nocollect"), unnamed
1727         enumerations are merged into one single enumeration represented by
1728         structure E_'.
1729    
1730    ----------------------------------------------------------------------
1731    Name: Allen Leung
1732    Date: 2002/02/25 04:45:00 EST
1733    Tag: leunga-20020225-cps-spill
1734    
1735    This is a new implementation of the CPS spill phase.
1736    The new phase is in the new file compiler/CodeGen/cpscompile/spill-new.sml
1737    In case of problems, replace it with the old file spill.sml
1738    
1739    The current compiler runs into some serious performance problems when
1740    constructing a large record.  This can happen when we try to compile a
1741    structure with many items.  Even a very simple structure like the following
1742    makes the compiler slow down.
1743    
1744        structure Foo = struct
1745           val x_1 = 0w1 : Word32.int
1746           val x_2 = 0w2 : Word32.int
1747           val x_3 = 0w3 : Word32.int
1748           ...
1749           val x_N = 0wN : Word32.int
1750        end
1751    
1752    The following table shows the compile time, from N=1000 to N=4000,
1753    with the old compiler:
1754    
1755    N
1756    1000   CPS 100 spill                           0.04u  0.00s  0.00g
1757           MLRISC ra                               0.06u  0.00s  0.05g
1758              (spills = 0 reloads = 0)
1759           TOTAL                                   0.63u  0.07s  0.21g
1760    
1761    1100   CPS 100 spill                           8.25u  0.32s  0.64g
1762           MLRISC ra                               5.68u  0.59s  3.93g
1763              (spills = 0 reloads = 0)
1764           TOTAL                                   14.71u  0.99s  4.81g
1765    
1766    1500   CPS 100 spill                           58.55u  2.34s  1.74g
1767           MLRISC ra                               5.54u  0.65s  3.91g
1768              (spills = 543 reloads = 1082)
1769           TOTAL                                   65.40u  3.13s  6.00g
1770    
1771    2000   CPS 100 spill                           126.69u  4.84s  3.08g
1772           MLRISC ra                               0.80u  0.10s  0.55g
1773              (spills = 42 reloads = 84)
1774           TOTAL                                   129.42u  5.10s  4.13g
1775    
1776    3000   CPS 100 spill                           675.59u  19.03s  11.64g
1777           MLRISC ra                               2.69u  0.27s  1.38g
1778              (spills = 62 reloads = 124)
1779           TOTAL                                   682.48u  19.61s  13.99g
1780    
1781    4000   CPS 100 spill                           2362.82u  56.28s  43.60g
1782           MLRISC ra                               4.96u  0.27s  2.72g
1783              (spills = 85 reloads = 170)
1784           TOTAL                                   2375.26u  57.21s  48.00g
1785    
1786    As you can see the old cps spill module suffers from some serious
1787    performance problem.  But since I cannot decipher the old code fully,
1788    instead of patching the problems up, I'm reimplementing it
1789    with a different algorithm.  The new code is more modular,
1790    smaller when compiled, and substantially faster
1791    (O(n log n) time and O(n) space).  Timing of the new spill module:
1792    
1793    4000  CPS 100 spill                           0.02u  0.00s  0.00g
1794          MLRISC ra                               0.25u  0.02s  0.15g
1795             (spills=1 reloads=3)
1796          TOTAL                                   7.74u  0.34s  1.62g
1797    
1798    Implementation details:
1799    
1800    As far as I can tell, the purpose of the CPS spill module is to make sure the
1801    number of live variables at any program point (the bandwidth)
1802    does not exceed a certain limit, which is determined by the
1803    size of the spill area.
1804    
1805    When the bandwidth is too large, we decrease the register pressure by
1806    packing live variables into spill records.  How we achieve this is
1807    completely different than what we did in the old code.
1808    
1809    First, there is something about the MLRiscGen code generator
1810    that we should be aware of:
1811    
1812    o MLRiscGen performs code motion!
1813    
1814       In particular, it will move floating point computations and
1815       address computations involving only the heap pointer to
1816       their use sites (if there is only a single use).
1817       What this means is that if we have a CPS record construction
1818       statement
1819    
1820           RECORD(k,vl,w,e)
1821    
1822       we should never count the new record address w as live if w
1823       has only one use (which is often the case).
1824    
1825       We should do something similar to floating point, but the transformation
1826       there is much more complex, so I won't deal with that.
1827    
1828    Secondly, there are now two new cps primops at our disposal:
1829    
1830     1. rawrecord of record_kind option
1831        This pure operator allocates some uninitialized storage from the heap.
1832        There are two forms:
1833    
1834         rawrecord NONE [INT n]  allocates a tagless record of length n
1835         rawrecord (SOME rk) [INT n] allocates a tagged record of length n
1836                                     and initializes the tag.
1837    
1838     2. rawupdate of cty
1839          rawupdate cty (v,i,x)
1840          Assigns to x to the ith component of record v.
1841          The storelist is not updated.
1842    
1843    We use these new primops for both spilling and increment record construction.
1844    
1845     1. Spilling.
1846    
1847        This is implemented with a linear scan algorithm (but generalized
1848        to trees).  The algorithm will create a single spill record at the
1849        beginning of the cps function and use rawupdate to spill to it,
1850        and SELECT or SELp to reload from it.  So both spills and reloads
1851        are fine-grain operations.  In contrast, in the old algorithm
1852        "spills" have to be bundled together in records.
1853    
1854        Ideally, we should sink the spill record construction to where
1855        it is needed.  We can even split the spill record into multiple ones
1856        at the places where they are needed.  But CPS is not a good
1857        representation for global code motion, so I'll keep it simple and
1858        am not attempting this.
1859    
1860     2. Incremental record construction (aka record splitting).
1861    
1862        Long records with many component values which are simulatenously live
1863        (recall that single use record addresses are not considered to
1864         be live) are constructed with rawrecord and rawupdate.
1865        We allocate space on the heap with rawrecord first, then gradually
1866        fill it in with rawupdate.  This is the technique suggested to me
1867        by Matthias.
1868    
1869        Some restrictions on when this is applicable:
1870        1. It is not a VECTOR record.  The code generator currently does not handle
1871           this case. VECTOR record uses double indirection like arrays.
1872        2. All the record component values are defined in the same "basic block"
1873           as the record constructor.  This is to prevent speculative
1874           record construction.
1875    
1876    ----------------------------------------------------------------------
1877    Name: Allen Leung
1878    Date: 2002/02/22 01:02:00 EST
1879    Tag: leunga-20020222-mlrisc-tools
1880    
1881    Minor bug fixes in the parser and rewriter
1882    
1883    ----------------------------------------------------------------------
1884  Name: Allen Leung  Name: Allen Leung
1885  Date: 2002/02/21 20:20:00 EST  Date: 2002/02/21 20:20:00 EST
1886  Tag: leunga-20020221-peephole  Tag: leunga-20020221-peephole

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