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Diff of /sml/trunk/HISTORY

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revision 695, Mon Aug 7 23:57:38 2000 UTC revision 1381, Wed Sep 17 21:28:41 2003 UTC
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8  The form of an entry should be:  The form of an entry should be:
9    
10  Name:  Name:
11  Date:  Date: yyyy/mm/dd
12  Tag: <post-commit CVS tag>  Tag: <post-commit CVS tag>
13  Description:  Description:
14    
15    ----------------------------------------------------------------------
16    Name:  Matthias Blume (blume (at) tti - c (dot) org)
17    Date: 2003/09/17 16:30:00 CDT
18    Tag: blume-20030917-real32-slices
19    Description:
20    
21    Added an entry to the primitive environment
22    (compiler/Semant/statenv/prim.sml) for int32->real64 conversion and
23    added code to compiler/CodeGen/main/mlriscGen.sml to implement it.
24    
25    Removed some of the "magic" constants in real64.sml and replaced them
26    with code that generates these values from their corresponding
27    integer counterparts.
28    
29    Made all(?) the slice-related changes to the Basis and made everything
30    compile again...
31    
32    ----------------------------------------------------------------------
33    Name: Matthias Blume (blume (at) tti - c (dot) org)
34    Date: 2003/09/15 17:45:00 CDT
35    Tag: blume-20030915-rbase
36    Description:
37    
38    Fixed bug in Real.fromLargeInt.
39    
40    ----------------------------------------------------------------------
41    Name: Matthias Blume (blume (at) tti - c (dot) org)
42    Date: 2003/09/13 18:11:00 CDT
43    Tag: blume-20030913-libinstall
44    Description:
45    
46    Minor bugfix in config/libinstall (set anchor with path to
47    standalone tool after installing it, otherwise libraries that
48    need ml-lex or ml-yacc won't compile the first time the installer
49    runs).
50    
51    ----------------------------------------------------------------------
52    Name: Matthias Blume (blume (at) tti - c (dot) org)
53    Date: 2003/09/12 11:45:00 CDT
54    Tag: blume-20030912-various
55    Description:
56    
57     - fixed bug in Real.toLargeInt
58     - fixed bug in Posix.ProcEnv.times
59     - changed inputLine functions to return an option
60     - minor installer improvements / bugfixes
61     - changed default @SMLalloc parameter for x86/celeron to 64k
62    
63    ----------------------------------------------------------------------
64    Name: Matthias Blume (blume (at) tti - c (dot) org)
65    Date: 2003/09/09 22:00:00 CDT
66    Tag: Release_110_43
67    Description:
68    
69        New working release 110.43.  New bootfiles.
70    
71    ----------------------------------------------------------------------
72    Name: Matthias Blume (blume (at) tti - c (dot) org)
73    Date: 2003/09/09 19:20:00 CDT
74    Tag: blume-20030909-installer
75    Description:
76    
77    Rewrote large parts of config/install.sh in SML (config/libinstall.sml).
78    Modified config/install.bat to take advantage of it.  Also modified
79    config/install.sh (and called it config/new-install.sh) to take advantage
80    of it on Unix systems.  (The SML code is (supposed to be) platform-
81    independent.)
82    
83    The installer can now install everything under Win32
84    as well as under *nix as long as it compiles.
85    
86    Other changes:
87    
88      - made CML compile again under Win32
89      - made eXene compile under Win32 (by providing a fake structure UnixSock
90        and by using OS.Process.getEnv instead of Posix.ProcEnv.getenv)
91      - fixed a bug in nowhere: it assumed that type OS.Process.status is the
92        same as type int;  under Win32 it isn't
93      - fixed some slice-related problems in the win32-specific parts of CML
94      - added a functor argument "sameVol" to os-path-fn.sml in the Basis
95        (under Win32, the volume name is case-insensitive, and the
96        OS.Path code compares volume names for equality)
97    
98    ----------------------------------------------------------------------
99    Name: Matthias Blume (blume (at) tti - c (dot) org)
100    Date: 2003/09/08 11:55:00 CDT
101    Tag: blume-20030908-fullpath
102    Description:
103    
104    Made Win32 version of OS.FileSys.fullPath return current directory
105    when given an empty string.  This is what the spec says, and incidentally,
106    CM depends on it.  (CM otherwise goes into an infinite loop in certain
107    cases when presented with the name of a non-existing .cm file.)
108    
109    ----------------------------------------------------------------------
110    Name: Matthias Blume (blume (at) tti - c (dot) org)
111    Date: 2003/09/04 16:30:00 CDT
112    Tag: blume-20030905-slices-etc
113    Description:
114    
115      1. Changed interface to vectors and arrays in Basis to match
116         (draft) Basis spec.
117      2. Added signatures and implementations of slices according to
118         Basis spec.
119      3. Edited source code throughout the system to make it compile again
120         under 1. and 2.  (In some cases code had to be added to have it
121         match the new signatures.)
122      4. MLRISC should be backward-compatible: the copies of the originals
123         of files that needed to change under 3. were retained, the .cm files
124         check the compiler version number and use old versions when
125         appropriate.
126      5. Changed type of OS.FileSys.readDir and Posix.FileSys.readdir to
127         dirstream -> string option (in accordance with Basis spec).
128      6. When generating code that counts lines, ml-lex used function
129         CharVector.foldli, taking advantage of its old interface.
130         This has been replaced with the corresponding code from
131         CharVectorSlice.  (html-lex must be re-lexed!)
132      7. BitArray in smlnj-lib/Util has been extended/modified to match the
133         new MONO_ARRAY signature.  (Do we need BitArraySlice?)
134      8. Removed temporary additions (fromInternal, toInternal) from the
135         (now obsolete) IntInf in smlnj-lib/Util.
136      9. Cleaned up structure Byte.
137     10. Added localOffset, scan, and fromString to Date (according to spec).
138         Cleaned/corrected implementation of Date.
139         (Still need to check for correctness; implement better canonicalizeDate.)
140     11. Added "scan" to signature IEEE_REAL.
141     12. Some improvements to IntInf [in particular: efficiency-hack for
142         mod and rem when second operand is 2 (for parity checks).]
143     13. Changed representation of type Time.time, using a single IntInf.int
144         value counting microseconds.  This considerably simplified the
145         implementation of structure Time.  We now support negative time
146         values; scan and fromString handle signs.
147     14. Functor PrimIO now takes two additional arguments (VectorSlice and
148         ArraySlice).
149    
150    ----------------------------------------------------------------------
151    Name: Matthias Blume (blume (at) tti - c (dot) org)
152    Date: 2003/08/28 17:00:00 CDT
153    Tag: blume-20030828-intinf
154    Description:
155    
156    This is a major update which comes with a version number bump
157    (110.42.99 -- yes, we are really close to 110.43 :-), NEW BOOTFILES,
158    and an implementation of IntInf in the Basis.
159    
160    There are a fairly large number of related changes and updates throughout
161    the system:
162    
163    Basis:
164            - Implemented IntInf.
165            - Made LargeInt a projection of IntInf (by filtering through INTEGER).
166            - Added some missing Real64 operations, most notably Real.toLargeInt.
167            - Added FixedInt as a synonym for Int32.
168    
169    compiler:
170            * Added support for a built-in intinf type.
171              - literals
172              - pattern matching
173              - conversion shortcuts (Int32.fromLarge o Int.toLarge etc.)
174              - overloading on literals and operations
175    
176            This required adding a primitive type intinf, some additional
177            primops, and implementations for several non-trivial intinf
178            operations in Core.  (The intinf type is completely abstract
179            to the compiler; all operations get delegated back to the Core.)
180    
181            * Intinf equality is handled by polyequal.  However, the compiler
182            does not print its usual warning in this case (since polyequal
183            is the right thing to do there).
184    
185            * Improved the organization of structure InlineT.
186    
187            * A word about conversion primops:
188            If conversions involving intinf do not cancel out during
189            CPS contract, then the compiler must insert calls to Core functions.
190            Since all core access must be resolved already during the FLINT
191            translate phase, it would be too late a the time of CPS contract
192            to add new Core calls.  For this reason, conversion primops
193            for intinf carry two arguments:  1. the numeric argument that
194            they are supposed to convert, and 2. the Core function that
195            can help with this conversion if necessary.  If CPS contract
196            eliminates a primop, then the associated Core function becomes
197            dead and goes away.  Intinf conversion primops that do not get
198            eliminated by CPS contract get rewritten into calls of their
199            core functions by a separate, new phase.
200    
201    interactive system:
202            - Control.Print.intinfDepth controls max length of intinf constants
203            being printed. (Analogous to Control.Print.stringDepth.)
204            - Cleanup in printutil and pputil: got rid of unused stuff and
205            duplicates; replaced some of the code with code that makes better
206            use of library functionality.
207    
208    CM:
209            Bugfix: parse-errors in init group (system/smlnj/init/init.cmi)
210            are no longer silent.
211    
212    CKIT:
213            Fixed mismatched uses of Int32 and LargeInt.  I always decided
214            in favor of LargeInt -- which is now the same as IntInf.
215            CKIT-knowledgable people should check whether this is what's
216            intended and otherwise change things back to using Int32 or
217            FixedInt.
218    
219    Throughout the code:
220            Started using IntInf.int literals and built-in operations
221            (e.g., comparison with 0) where this seems appropriate.
222    
223    
224    ----------------------------------------------------------------------
225    Name: Dave MacQueen (dbm@cs.uchicago.edu)
226    Date: 2003/08/13 11:36:00 CDT
227    Tag: dbm-20030813-mcz-merge1
228    Description:
229    
230    Merging changes from the mcz-branch development branch into trunk.
231    These changes involve replacement of the emulated old prettyprinter
232    interface with direct use of the SML/NJ Lib PP library, and fixing
233    of a couple of bugs (895, 1186) relating to error messages.  A new
234    prettyprinter for ast datatypes (Elaborator/print/ppast.{sig,sml})
235    has been added.
236    
237    ----------------------------------------------------------------------
238    Name: Matthias Blume (blume (at) tti - c (dot) org)
239    Date: 2003/08/11 15:45:00 CDT
240    Tag: blume-20030811-windows
241    Description:
242    
243    Version number bumped to 110.42.9.  NEW BOOTFILES!!!
244    
245        http://smlnj.cs.uchicago.edu/dist/working/110.42.9/
246    
247    This patch restores SML/NJ's ability to run under win32.  There are a
248    number of changes, including fixes for several bugs that had gone
249    unnoticed until now:
250    
251      - uname "CYGWIN_NT*" is recognized as win32 (This is relevant only when
252        trying to run the win32 version from within cygwin.)
253    
254      - There are a number of simple .bat scripts that substitute for their
255        corresponding Unix shell-scripts.  (See below.)
256    
257      - The internals of ml-build have been modified slightly.  The main
258        difference is that instead of calling ".link-sml" (or link-sml.bat)
259        using OS.Process.system, the ML process delegates this task back
260        to the script.  Otherwise problems arise in mixed environments such
261        as Cygwin where scripts look and work like Unix scripts, but
262        where OS.Process.system cannot run them.
263    
264      - In CM, the srcpath pickler used native pathname syntax -- which
265        is incorrect in the case of cross-compilation.  The new pickle format
266        is independent of platform-specific naming conventions.
267    
268      - Path configuration files (such as lib/pathconfig) can now choose
269        between native and standard syntax.  Placing a line of the form
270    
271            standard!
272    
273        into the file causes all subsequent paths to be interpreted using
274        CM standard pathname syntax (= Unix conventions); a line
275    
276            native!
277    
278        switches back to native style.  This was needed so that
279        path config files can be written portably, see src/system/pathconfig.
280    
281      - Runtime system:
282    
283          - win32-filesys.c:  get_file_time and set_file_time now
284            access modification time, not creation time.
285    
286          - I/O code made aware of new array representation.
287    
288          - Bug fixes in X86.prim.masm.
289    
290       - src/system/makeml made aware of win32. (For use under cygwin
291            and other Unix-environments for windows.)
292    
293       - In Basis, fixed off-by-one error in win32-io.sml (function vecF)
294         which caused BinIO.inputAll to fail consistently.
295    
296    .bat scripts:
297    
298       Windows .bat scripts assume that SMLNJ_HOME is defined.
299    
300       - sml.bat, ml-yacc.bat, ml-lex.bat:  Driver scripts for standalone
301         applications (sml, ml-yacc, ml-lex).
302       - ml-build.bat: analogous to ml-build.
303       - config\install.bat:  Analogous to config/install.sh.  This requires
304         that SMLNJ_HOME is set and that Microsoft Visual C is ready to use.
305         (nmake etc. must be on the path, and vcvars32 must have been run.)
306         Moreover, sources for ml-lex and ml-yacc need to exist under src,
307         and the bootfile hierarchy must have been unpacked under
308         sml.boot.x86-win32.
309         The script is very primitive and does a poor job at error checking.
310         It only installs the base system, ml-lex, and ml-yacc.  No other
311         libraries are being installed (i.e., you get only those that
312         are part of the compiler.)
313       - link-sml.bat:  analogous to .link-sml, but not currently used
314    
315    Unrelated bug fixes:
316    
317      - ml-nlffigen now exports structures ST_* corresponding to incomplete
318        types.
319      - Added getDevice to PP/src/pp-debug-fn.sml.  (Would not compile
320        otherwise.)
321    
322    ----------------------------------------------------------------------
323    Name: Dave MacQueen (macqueen@cs.uchicago.edu)
324    Date: 2003/06/17
325    Tag: macqueen-20030617-bug895
326    Description:
327    
328    Modified compiler/Elaborator/print/pptype.sml to fix bug 895.
329    Tag will be used for new development branch (mcz-branch) for
330    use by MacQueen, (Lucasz) Zairek, and (George) Cao at uchicago.
331    
332    ----------------------------------------------------------------------
333    Name: Matthias Blume (blume (at) tti - c (dot) org)
334    Date: 2003/05/27 16:55:00 CDT
335    Tag: blume-20030527-polyeq
336    Description:
337    
338    Tried to eliminated most cases of polymorphic equality.
339    
340    ----------------------------------------------------------------------
341    Name: Matthias Blume (blume (at) tti - c (dot) org)
342    Date: 2003/05/21 17:45:00 CDT
343    Tag: blume-20030517-complete
344    Description:
345    
346    Two changes:
347    
348      1. Added a flag for controlling whether non-exhaustive bindings will
349         be treated as errors (default is false).
350      2. Cleaned up the *entire* source tree so that CMB.make goes through
351         without a single non-exhaustive match- or bind warning.
352    
353    ----------------------------------------------------------------------
354    Name: Matthias Blume (blume (at) tti - c (dot) org)
355    Date: 2003/05/17 10:20:00 CDT
356    Tag: blume-20030517-absyn
357    Description:
358    
359    1. Added cases for IF, WHILE, ANDALSO, and ORELSE to Absyn.
360    
361       This mainly affects the quality of error messages.  However, some
362       of the code is now more straightforward than before. (Treatment of
363       the above four constructs in translate.sml is much simpler than
364       the "macro-expansion" that was going on before.  Plus, the mach-
365       compiler no longer gets invoked just to be able to compile an
366       if-expression.)
367    
368    2. The ErrorMsg.Error exception is now caught and absorbed by the
369       interactive loop.
370    
371    ----------------------------------------------------------------------
372    Name: Allen Leung
373    Date: 2003/05/16 13:05:00 CDT
374    Tag: leunga-20030516-cygwin-runtime
375    Description:
376    
377        Ported the runtime system to cygwin, which uses the unix
378    x86-unix bin files.  Missing/buggy features:
379    
380       o getnetbyname, getnetbyaddr: these functions seem to be missing in
381         the Cygwin library.
382       o Ctrl-C handling may be flaky.
383       o Windows system calls and Windows I/O are not supported.
384    
385       A new set of binfiles is located at:
386    
387         http://www.dorsai.org/~leunga/boot.x86-unix.tgz
388    
389       This is only needed for bootstrapping the cygwin version of smlnj.
390       Other x86 versions can use the existing binfiles.
391    
392    ----------------------------------------------------------------------
393    Name: Matthias Blume
394    Date: 2003/04/08 15:42:00 CDT
395    Tag: blume-20030408-listpair
396    Description:
397    
398    1. Added a target 'mlrisc' to installer.
399    
400    2. Added missing elements to structure ListPair.
401    
402    ----------------------------------------------------------------------
403    Name: Allen Leung
404    Date: 2003/01/07 10:40:00 EST
405    Tag: leunga-20030107-int-rem
406    Description:
407    
408    Fixed a bug in Int.rem(x,y) where y is a power of 2 on x86.
409    The arguments to the SUBL instruction were swapped.
410    
411    ----------------------------------------------------------------------
412    Name: Matthias Blume
413    Date: 2002/12/12 16:25:00 EST
414    Tag: blume-20021212-risc-ra
415    Description:
416    
417    Fixed a serious bug in the rewrite code for FP spilling/reloading that
418    sent the RA into an infinite loop when floating point registers get
419    spilled.  (Because of this bug, e.g., nucleic stopped compiling between
420    110.37 and 110.38.)
421    There was another set of potential problems related to the handling of
422    MLRISC annotations (but those did not yet cause real problems, apparently).
423    
424    ----------------------------------------------------------------------
425    Name: Matthias Blume
426    Date: 2002/12/06 22:40:00 EST
427    Tag: blume-20021206-cm-fileid
428    Description:
429    
430    Added a call of SrcPath.sync at the beginning of Parse.parse (in CM).
431    This fixes the problem of CM getting confused by files that suddenly
432    change their identity (e.g., by getting unlinked and recreated by some
433    text editor such as vi).  There might be a better/cheaper/cleaner way
434    of doing this, but for now this will have to do.
435    
436    ----------------------------------------------------------------------
437    Name: Matthias Blume
438    Date: 2002/10/28 09:50:00 EST
439    Tag: blume-20021028-typecheck
440    Description:
441    
442    Exported structure Typecheck from $smlnj/viscomp/core.cm.
443    
444    ----------------------------------------------------------------------
445    Name: Matthias Blume
446    Date: 2002/10/17 09:10:00 EDT
447    Tag: Release_110_42
448    Description:
449    
450    In good old tradition, there has been a slight hiccup so that we have
451    to patch 110.42 after the fact.   The old release tag has been replaced
452    (see below).
453    
454    The change solves a problem with two competing approaches the
455    configuration problem regarding MacOS 10.1 vs. MacOS 10.2 which got in
456    each other's way.
457    
458    This change only affects the runtime system code and the installer script.
459    (No new bootfiles.)
460    
461    ----------------------------------------------------------------------
462    Name: Matthias Blume
463    Date: 2002/10/16 12:00:00 EDT
464    Tag: Release_110_42_removed
465    Description:
466    
467    New working release.  New bootfiles.
468    
469    ----------------------------------------------------------------------
470    Name: Matthias Blume
471    Date: 2002/10/10 13:10:00 EDT
472    Tag: blume-20021010-ppc-divs
473    Description:
474    
475    The mltree operator DIVS must be implemented with an overflow check on
476    the PPC because the hardware indicates divide-by-zero using "overflow" as
477    well.
478    
479    ----------------------------------------------------------------------
480    Name: Matthias Blume
481    Date: 2002/07/23 11:45:00
482    Tag: blume-20020723-smlnj-home
483    Description:
484    
485    Sml now senses the SMLNJ_HOME environment variable.  If this is set,
486    then the bin dir is assumed to be in $SMLNJ_HOME/bin and (unless
487    CM_PATHCONFIG is also set), the path configuration file is assumed
488    to be in $SMLNJ_HOME/lib/pathconfig.  This way one can easily move
489    the entire tree to some other place and everything will "just work".
490    
491    (Companion commands such as ml-build and ml-makedepend also sense this
492    variable.)
493    
494    ----------------------------------------------------------------------
495    Name: Matthias Blume
496    Date: 2002/07/12 21:19:00 EDT
497    Tag: blume-20020712-liveness
498    Description:
499    
500    Exported two useful "step" functions from liveness module (MLRISC).
501    
502    ----------------------------------------------------------------------
503    Name: Matthias Blume
504    Date: 2002/07/05 16:00 EDT
505    Tag: Release_110_41
506    Description:
507    
508    New working release.  New bootfiles.
509    
510    ----------------------------------------------------------------------
511    Name: Matthias Blume
512    Date: 2002/07/05 10:25:00 EDT
513    Tag: blume-20020705-btimp
514    Description:
515    
516    Exported structure BTImp from $smlnj/viscomp/debugprof.cm so that
517    other clients can set up backtracing support.
518    
519    ----------------------------------------------------------------------
520    Name: Matthias Blume
521    Date: 2002/06/25 17:23:00 EDT
522    Tag: blume-20020625-fpmax
523    Description:
524    
525    Fixed a bug in translation of INLMAX (and INLMIN) for the floating-point
526    case.  (The sense of the isNaN test was reversed -- which made min and
527    max always return their first argument.)
528    
529    ----------------------------------------------------------------------
530    Name: Matthias Blume
531    Date: 2002/06/11
532    Tag: blume-20020611-unixpath
533    Description:
534    
535    Back-ported OS.Path.{from,to}UnixPath from idlbasis-devel branch.
536    
537    ----------------------------------------------------------------------
538    Name: Matthias Blume
539    Date: 2002/06/10 16:35:00 EDT
540    Tag: blume-20020610-ieeereal
541    Description:
542    
543    I back-ported my implementation of IEEEReal.fromString from the
544    idlbasis-devel branch so that we can test it.
545    
546    Another small change is that ppDec tries to give more information
547    than just "<sig>" in the case of functors.  However, this code is
548    broken in some mysterious way if the functor's body's signature
549    has not been declared by ascription but gets inferred from the
550    implementation.  This needs fixing...
551    
552    ----------------------------------------------------------------------
553    Name: Matthias Blume
554    Date: 2002/05/31
555    Tag: blume-20020531-btrace-mode
556    Description:
557    
558    Resurrected SMLofNJ.Internals.BTrace.mode.  (It accidentally fell by
559    the wayside when I switched over to using Controls everywhere.)
560    
561    ----------------------------------------------------------------------
562    Name: Lal George
563    Date: 2002/05/23 12:21:40 EDT
564    Tag: george-20020523-visual-labels
565    Description:
566    
567    Labels are now displayed in the graphical output to make
568    the fall-through and target blocks obvious.
569    
570    ----------------------------------------------------------------------
571    Name: Matthias Blume
572    Date: 2002/05/22 11:03:00 EDT
573    Tag: blume-20020522-shrink
574    Description:
575    
576    John tweaked yesterday's fix for 1131 to handle an out-of-memory
577    situation that comes up when allocating huge arrays.
578    
579    ----------------------------------------------------------------------
580    Name: Matthias Blume
581    Date: 2002/05/21 16:00:00 EDT
582    Tag: Release_110_40
583    Description:
584    
585    New working release (110.40).  New bootfiles.
586    
587    [Also: John Reppy fixed GC bug 1131.]
588    
589    ----------------------------------------------------------------------
590    Name: Matthias Blume
591    Date: 2002/05/21 12:35:00 EDT
592    Tag: blume-20020521-cmdoc
593    Description:
594    
595    CM documentation update.
596    
597    ----------------------------------------------------------------------
598    Name: Matthias Blume
599    Date: 2002/05/21 10:55:00 EDT
600    Tag: blume-20020521-misc
601    Description:
602    
603    - John tweaked runtime to be silent on heap export (except when
604      GC messages are on).
605    - I added a few more things (cross-compiling versions of CMB) to
606      config/preloads (as suggestions).
607    
608    ----------------------------------------------------------------------
609    Name: Matthias Blume
610    Date: 2002/05/20 22:25:00 EDT
611    Tag: blume-20020520-controls
612    Description:
613    
614    - Added ControlUtil structure to control-lib.cm.
615    - Use it throughout.
616    - Used Controls facility to define MLRISC controls (as opposed to
617      registering MLRISC control ref cells with Controls after the fact)
618    - Fixed messed-up controls priorities.
619    
620    * Removed again all the stuff from config/preloads that one wouldn't
621      be able to preload at the time the initial heap image is built.
622      (Many libraries, e.g., CML, do not exist yet at this time.  The
623       only libraries that can be preloaded via config/preloads are those
624       that come bundled with the bootfiles.)
625    
626    ----------------------------------------------------------------------
627    Name: Matthias Blume
628    Date: 2002/05/20 10:59:00 EDT
629    Tag: blume-20020520-preloads
630    Description:
631    
632    Added a lot of commented-out suggestions for things to be included
633    in config/preloads.
634    
635    ----------------------------------------------------------------------
636    Name: Allen Leung
637    Date: 2002/05/18 14:20:00 EDT
638    Tag: leunga-20020518-mdl
639    Description:
640    
641    o Made the mdl tool stuff compile and run again.
642    o I've disabled all the stuff that depends on RTL specifications; they
643      are all badly broken anyway.
644    
645    ----------------------------------------------------------------------
646    Name: Matthias Blume
647    Date: 2002/05/17 16:49:00 EDT
648    Tag: blume-20020517-controls
649    Description:
650    
651    0. John Reppy made several modifications to the SML/NJ library.
652       In particular, there is a shiny new controls-lib.cm.
653    
654    1. Pushed new controls interface through compiler so that everything
655       compiles again.
656    
657    2. Added FormatComb and FORMAT_COMB to the CML version of the
658       SML/NJ library (so that CML compiles again).
659    
660    3. Modified init scripts because XXX_DEFAULT environment variables
661       are no longer with us.  (Boot-time initialization is now done
662       using the same environment variables that are also used for
663       startup-time initialization of controls.)
664    
665    ----------------------------------------------------------------------
666    Name: Lal George
667    Date: 2002/05/15 09:20:10 EDT
668    Tag: george-20020515-pseudo-op-decls
669    Description:
670    
671            All pseudo-ops emitted before the first segment declaration
672    such as TEXT, DATA, and BSS directives are assumed to be global
673    declarations and are emitted first in the assembly file. This is
674    useful in a number of situations where one has pseudo-ops that are not
675    specific to any segment, and also works around the constraint that one
676    cannot have client pseudo-ops in the TEXT segment.
677    
678            Because no segment is associated with these declarations it is
679    an error to allocate any space or objects before the first segment
680    directive and an exception will be raised. However, we cannot make
681    this check for client pseudo-ops.
682    
683            These top level declarations are a field in the CFG graph_info.
684    In theory you can continue to add to this field after the CFG has been
685    built -- provided you know what you are doing;-)
686    
687    ----------------------------------------------------------------------
688    Name: Matthias Blume
689    Date: 2002/05/13 16:40:00 EDT
690    Tag: blume-20020513-pp-etc
691    Description:
692    
693    A few minor bugfixes:
694    
695      - Stopgap measure for bug recently reported by Elsa Gunter (ppDec).
696        (Bogus printouts for redefined bindings still occur.  Compiler
697        bug should no longer occur now.  We need to redo the prettyprinter
698        from scratch.)
699    
700      - CM pathname printer now also adds escape sequences for ( and )
701    
702      - commend and docu fixes for ml-nlffi
703    
704    ----------------------------------------------------------------------
705    Name: Matthias Blume
706    Date: 2002/05/10 16:40:00 EDT
707    Tag: blume-20020510-erg-textio
708    Description:
709    
710    Applied the following bugfix provided by Emden Gansner:
711    
712        Output is corrupted when outputSubstr is used rather than output.
713    
714        The problem occurs when a substring
715    
716            ss = (s, dataStart, dataLen)
717    
718        where dataStart > 0, fills a stream buffer with avail bytes left.
719        avail bytes of s, starting at index dataStart, are copied into the
720        buffer, the buffer is flushed, and then the remaining dataLen-avail
721        bytes of ss are copied into the beginning of the buffer. Instead of
722        starting this copy at index dataStart+avail in s, the current code
723        starts the copy at index avail.
724    
725        Fix:
726        In text-io-fn.sml, change line 695 from
727             val needsFlush = copyVec(v, avail, dataLen-avail, buf, 0)
728        to
729             val needsFlush = copyVec(v, dataStart+avail, dataLen-avail, buf, 0)
730    
731    ----------------------------------------------------------------------
732    Name: Matthias Blume
733    Date: 2002/04/12 13:55:00 EDT
734    Tag: blume-20020412-assyntax
735    Description:
736    
737    1. Grabbed newer assyntax.h from the XFree86 project.
738    2. Fiddled with how to compile X86.prim.asm without warnings.
739    3. (Very) Minor cleanup in CM.
740    
741    ----------------------------------------------------------------------
742    Name: Matthias Blume
743    Date: 2002/04/01 (no joke!) 17:07:00 EST
744    Tag: blume-20020401-x86div
745    Description:
746    
747    Added full support for div/mod/rem/quot on the x86, using the machine
748    instruction's two results (without clumsily recomputing the remainder)
749    directly where appropriate.
750    
751    Some more extensive power-of-two support was added to the x86 instruction
752    selector (avoiding expensive divs, mods, and muls where they can be
753    replaced with cheaper shifts and masks).  However, this sort of thing
754    ought to be done earlier, e.g., within the CPS optimizer so that
755    all architectures benefit from it.
756    
757    The compiler compiles to a fixed point, but changes might be somewhat
758    fragile nevertheless.  Please, report any strange things that you might
759    see wrt. div/mod/quot/rem...
760    
761    ----------------------------------------------------------------------
762    Name: Matthias Blume
763    Date: 2002/03/29 17:22:00
764    Tag: blume-20020329-div
765    Description:
766    
767    Fixed my broken div/mod logic.  Unfortunately, this means that the
768    inline code for div/mod now has one more comparison than before.
769    Fast paths (quotient > 0 or remainder = 0) are not affected, though.
770    The problem was with quotient = 0, because that alone does not tell
771    us which way the rounding went.  One then has to look at whether
772    remainder and divisor have the same sign...  :(
773    
774    Anyway, I replaced the bootfiles with fresh ones...
775    
776    ----------------------------------------------------------------------
777    Name: Matthias Blume
778    Date: 2002/03/29 14:10:00 EST
779    Tag: blume-20020329-inlprims
780    Description:
781    
782    NEW BOOTFILES!!!    Version number bumped to 110.39.3.
783    
784    Primops have changed. This means that the bin/boot-file formats have
785    changed as well.
786    
787    To make sure that there is no confusion, I made a new version.
788    
789    
790    CHANGES:
791    
792    * removed REMT from mltree (remainder should never overflow).
793    
794    * added primops to deal with divisions of all flavors to the frontend
795    
796    * handled these primops all the way through so they map to their respective
797      MLRISC support
798    
799    * used these primops in the implementation of Int, Int32, Word, Word32
800    
801    * removed INLDIV, INLMOD, and INLREM as they are no longer necessary
802    
803    * parameterized INLMIN, INLMAX, and INLABS by a numkind
804    
805    * translate.sml now deals with all flavors of INL{MIN,MAX,ABS}, including
806      floating point
807    
808    * used INL{MIN,MAX,ABS} in the implementation of Int, Int32, Word, Word32,
809      and Real (but Real.abs maps to a separate floating-point-only primop)
810    
811    
812    TODO items:
813    
814    * Hacked Alpha32 instruction selection, disabling the selection of REMx
815      instructions because the machine instruction encoder cannot handle
816      them.  (Hppa, PPC, and Sparc instruction selection did not handle
817      REM in the first place, and REM is supported by the x86 machine coder.)
818    
819    * Handle DIV and MOD with DIV_TO_NEGINF directly in the x86 instruction
820      selection phase.  (The two can be streamlined because the hardware
821      delivers both quotient and remainder at the same time anyway.)
822    
823    * Think about what to do with "valOf(Int32.minInt) div ~1" and friends.
824      (Currently the behavior is inconsistent both across architectures and
825      wrt. the draft Basis spec.)
826    
827    * Word8 should eventually be handled natively, too.
828    
829    * There seems to be one serious bug in mltree-gen.sml.  It appears, though,
830      as if there currently is no execution path that could trigger it in
831      SML/NJ.  (The assumptions underlying functions arith and promotable do not
832      hold for things like multiplication and division.)
833    
834    ----------------------------------------------------------------------
835    Name: Matthias Blume
836    Date: 2002/03/27 16:27:00 EST
837    Tag: blume-20020327-mlrisc-divisions
838    Description:
839    
840    Added support for all four division operations (ML's div, mod, quot,
841    and rem) to MLRISC.  In the course of doing so, I also rationalized
842    the naming (no more annoying switch-around of DIV and QUOT), by
843    parameterizing the operation by div_rounding_mode (which can be either
844    DIV_TO_ZERO or DIV_TO_NEGINF).
845    
846    The generic MLTreeGen functor takes care of compiling all four
847    operations down to only round-to-zero div.
848    
849    Missing pieces:
850    
851      * Doing something smarter than relying on MLTreeGen on architectures
852        like, e.g., the x86 where hardware division delivers both quotient and
853        remainder at the same time.  With this, the implementation of the
854        round-to-neginf operations could be further streamlined.
855    
856      * Remove inlining support for div/mod/rem from the frontend and replace it
857        with primops that get carried through to the backend.  Do this for all
858        int and word types.
859    
860    ----------------------------------------------------------------------
861    Name: Matthias Blume
862    Date: 2002/03/25 17:25:00 EST
863    Tag: blume-20020325-divmod
864    Description:
865    
866    I improved (hopefully without breaking them) the implementation of Int.div,
867    Int.mod, and Int.rem.   For this, the code in translate.sml now takes
868    advantage of the following observations:
869    
870      Let  q = x quot y      r = x rem y
871           d = x div  y      m = x mod y
872    
873    where "quot" is the round-to-zero version of integer division that
874    hardware usually provides.  Then we have:
875    
876         r = x - q * y        where neither the * nor the - will overflow
877         d = if q >= 0 orelse x = q * y then q else q - 1
878                              where neither the * nor the - will overflow
879         m = if q >= 0 orelse r = 0 then r else r + y
880                              where the + will not overflow
881    
882    This results in substantial simplification of the generated code.
883    The following table shows the number of CFG nodes and edges generated
884    for
885            fun f (x, y) = x OPER y
886            (* with OPER \in div, mod, quot, rem *)
887    
888    
889        OPER | nodes(old) | edges(old) | nodes(new) | edges(new)
890        --------------------------------------------------------
891         div |         24 |         39 |         12 |         16
892         mod |         41 |         71 |         12 |         16
893        quot |          8 |         10 |          8 |         10
894         rem |         10 |         14 |          8 |         10
895    
896    
897    ----------------------------------------------------------------------
898    Name: Matthias Blume
899    Date: 2002/03/25 22:06:00 EST
900    Tag: blume-20020325-cprotobug
901    Description:
902    
903    Fixed a bug in cproto (c prototype decoder).
904    
905    ----------------------------------------------------------------------
906    Name: Matthias Blume
907    Date: 2002/03/25 16:00:00 EST
908    Tag: blume-20020325-raw-primops
909    Description:
910    
911    I did some cleanup to Allen's new primop code and
912    replaced yesterday's bootfiles with new ones.
913    (But they are stored in the same place.)
914    
915    ----------------------------------------------------------------------
916    Name: Matthias Blume
917    Date: 2002/03/24 22:40:00 EST
918    Tag: blume-20020324-bootfiles
919    Description:
920    
921    Made the bootfiles that Allen asked for.
922    
923    ----------------------------------------------------------------------
924    Name: Allen Leung
925    Date: 2002/03/23 15:50:00 EST
926    Tag: leunga-20020323-flint-cps-rcc-primops
927    Description:
928    
929      1. Changes to FLINT primops:
930    
931        (* make a call to a C-function;
932         * The primop carries C function prototype information and specifies
933         * which of its (ML-) arguments are floating point. C prototype
934         * information is for use by the backend, ML information is for
935         * use by the CPS converter. *)
936      | RAW_CCALL of { c_proto: CTypes.c_proto,
937                       ml_args: ccall_type list,
938                       ml_res_opt: ccall_type option,
939                       reentrant : bool
940                     } option
941       (* Allocate uninitialized storage on the heap.
942        * The record is meant to hold short-lived C objects, i.e., they
943        * are not ML pointers.  With the tag, the representation is
944        * the same as RECORD with tag tag_raw32 (sz=4), or tag_fblock (sz=8)
945        *)
946      | RAW_RECORD of {tag:bool,sz:int}
947      and ccall_type = CCALL_INT32 | CCALL_REAL64 | CCALL_ML_PTR
948    
949      2.  These CPS primops are now overloaded:
950    
951           rawload of {kind:numkind}
952           rawstore of {kind:numkind}
953    
954          The one argument form is:
955    
956             rawload {kind} address
957    
958          The two argument form is:
959    
960             rawload {kind} [ml object, byte-offset]
961    
962      3. RAW_CCALL/RCC now takes two extra arguments:
963    
964         a. The first is whether the C call is reentrant, i.e., whether
965            ML state should be saved and restored.
966         b. The second argument is a string argument specifying the name of
967            library and the C function.
968    
969         These things are currently not handled in the code generator, yet.
970    
971      4. In CProto,
972    
973         An encoding type of "bool" means "ml object" and is mapped into
974         C prototype of PTR.  Note that "bool" is different than "string",
975         even though "string" is also mapped into PTR, because "bool"
976         is assigned an CPS type of BOGt, while "string" is assigned INT32t.
977    
978      5. Pickler/unpicker
979    
980         Changed to handle RAW_RECORD and newest RAW_CCALL
981    
982      6. MLRiscGen,
983    
984         1. Changed to handle the new rawload/rawstore/rawrecord operators.
985         2. Code for handling C Calls has been moved to a new module CPSCCalls,
986            in the file CodeGen/cpscompile/cps-c-calls.sml
987    
988      7. Added the conditional move operator
989    
990             condmove of branch
991    
992         to cps.  Generation of this is still buggy so it is currently
993         disabled.
994    
995    ----------------------------------------------------------------------
996    Name: Lal George
997    Date: 2002/03/22 14:18:25 EST
998    Tag: george-20020322-cps-branch-prob
999    Description:
1000    
1001    Implemented the Ball-Larus branch prediction-heuristics, and
1002    incorporated graphical viewers for control flow graphs.
1003    
1004    Ball-Larus Heuristics:
1005    ---------------------
1006    See the file compiler/CodeGen/cpscompile/cpsBranchProb.sml.
1007    
1008    By design it uses the Dempster-Shafer theory for combining
1009    probabilities.  For example, in the function:
1010    
1011        fun f(n,acc) = if n = 0 then acc else f(n-1, n*acc)
1012    
1013    the ball-larus heuristics predicts that the n=0 is unlikely
1014    (OH-heuristic), and the 'then' branch is unlikely because of the
1015    RH-heuristic -- giving the 'then' branch an even lower combined
1016    probability using the Dempster-Shafer theory.
1017    
1018    Finally, John Reppy's loop analysis in MLRISC, further lowers the
1019    probability of the 'then' branch because of the loop in the else
1020    branch.
1021    
1022    
1023    Graphical Viewing:
1024    ------------------
1025    I merely plugged in Allen's graphical viewers into the compiler. The
1026    additional code is not much. At the top level, saying:
1027    
1028            Control.MLRISC.getFlag "cfg-graphical-view" := true;
1029    
1030    will display the graphical view of the control flow graph just before
1031    back-patching.  daVinci must be in your path for this to work. If
1032    daVinci is not available, then the default viewer can be changed
1033    using:
1034    
1035            Control.MLRISC.getString "viewer"
1036    
1037    which can be set to "dot" or "vcg" for the corresponding viewers. Of
1038    course, these viewers must be in your path.
1039    
1040    The above will display the compilation unit at the level of clusters,
1041    many of which are small, boring, and un-interesting. Also setting:
1042    
1043            Control.MLRISC.getInt "cfg-graphical-view_size"
1044    
1045    will display clusters that are larger than the value set by the above.
1046    
1047    
1048    ----------------------------------------------------------------------
1049    Name: Matthias Blume
1050    Date: 2002/03/21 22:20:00 EST
1051    Tag: blume-20020321-kmp-bugfix
1052    Description:
1053    
1054    Changed the interface to the KMP routine in PreString and fixed
1055    a minor bug in one place where it was used.
1056    
1057    ----------------------------------------------------------------------
1058    Name: Allen Leung
1059    Date: 2002/03/21 20:30:00 EST
1060    Tag: leunga-20020321-cfg
1061    Description:
1062    
1063      Fixed a potential problem in cfg edge splitting.
1064    
1065    ----------------------------------------------------------------------
1066    Name: Allen Leung
1067    Date: 2002/03/21 17:15:00 EST
1068    Tag: leunga-20020321-x86-fp-cfg
1069    Description:
1070    
1071      1. Recoded the buggy parts of x86-fp.
1072    
1073         a. All the block reordering code has been removed.
1074            We now depend on the block placement phases to do this work.
1075    
1076         b. Critical edge splitting code has been simplified and moved into the
1077            CFG modules, as where they belong.
1078    
1079         Both of these were quite buggy and complex.  The code is now much, much
1080         simpler.
1081    
1082      2. X86 backend.
1083    
1084         a. Added instructions for 64-bit support.  Instruction selection for
1085            64-bit has not been committed, however, since that
1086            requires changes to MLTREE which haven't been approved by
1087            Lal and John.
1088    
1089         b. Added support for FUCOMI and FUCOMIP when generating code for
1090            PentiumPro and above.  We only generate these instructions in
1091            the fast-fp mode.
1092    
1093         c. Added cases for JP and JNP in X86FreqProps.
1094    
1095      3. CFG
1096    
1097         CFG now has a bunch of methods for edge splitting and merging.
1098    
1099      4. Machine description.
1100    
1101         John's simplification of MLTREE_BASIS.fcond broke a few machine
1102         description things:
1103    
1104         rtl-build.{sig,sml} and hppa.mdl fixed.
1105    
1106         NOTE: the machine description stuff in the repository is still broken.
1107               Again, I can't put my fixes in because that involves
1108               changes to MLTREE.
1109    
1110    ----------------------------------------------------------------------
1111    Name: Matthias Blume
1112    Date: 2002/03/20 15:55:00 EST
1113    Tag: blume-20020320-kmp
1114    Description:
1115    
1116    Implemented Knuth-Morris-Pratt string matching in PreString and used
1117    it for String.isSubstring, Substring.isSubstring, and
1118    Substring.position.
1119    
1120    (Might need some stress-testing.  Simple examples worked fine.)
1121    
1122    ----------------------------------------------------------------------
1123    Name: Matthias Blume
1124    Date: 2002/03/19 16:37:00 EST
1125    Tag: blume-20020319-witnesses
1126    Description:
1127    
1128    Added a structure C.W and functions convert/Ptr.convert to ml-nlffi-lib.
1129    
1130    This implements a generic mechanism for changing constness qualifiers
1131    anywhere within big C types without resorting to outright "casts".
1132    (So far, functions such as C.rw/C.ro or C.Ptr.rw/C.Ptr.ro only let you
1133    modify the constness at the outermost level.)
1134    The implementation of "convert" is based on the idea of "witness"
1135    values -- values that are not used by the operation but whose types
1136    "testify" to their applicability.  On the implementation side, "convert"
1137    is simply a projection (returning its second curried argument).  With
1138    cross-module inlining, it should not result in any machine code being
1139    generated.
1140    
1141    ----------------------------------------------------------------------
1142    Name: Matthias Blume
1143    Date: 2002/03/15 16:40:00 EST
1144    Tag: blume-20020315-basis
1145    Description:
1146    
1147    Provided (preliminary?) implementations for
1148    
1149      {String,Substring}.{concatWith,isSuffix,isSubstring}
1150    
1151    and
1152    
1153      Substring.full
1154    
1155    Those are in the Basis spec but they were missing in SML/NJ.
1156    
1157    ----------------------------------------------------------------------
1158    Name: Matthias Blume
1159    Date: 2002/03/14 21:30:00 EST
1160    Tag: blume-20020314-controls
1161    Description:
1162    
1163    Controls:
1164    ---------
1165    
1166    1. Factored out the recently-added Controls : CONTROLS stuff and put
1167       it into its own library $/controls-lib.cm.  The source tree for
1168       this is under src/smlnj-lib/Controls.
1169    
1170    2. Changed the names of types and functions in this interface, so they
1171       make a bit more "sense":
1172    
1173          module -> registry
1174          'a registry -> 'a group
1175    
1176    3. The interface now deals in ref cells only.  The getter/setter interface
1177       is (mostly) gone.
1178    
1179    4. Added a function that lets one register an already-existing ref cell.
1180    
1181    5. Made the corresponding modifications to the rest of the code so that
1182       everything compiles again.
1183    
1184    6. Changed the implementation of Controls.MLRISC back to something closer
1185       to the original.  In particular, this module (and therefore MLRISC)
1186       does not depend on Controls.  There now is some link-time code in
1187       int-sys.sml that registers the MLRISC controls with the Controls
1188       module.
1189    
1190    CM:
1191    ---
1192    
1193      * One can now specify the lambda-split aggressiveness in init.cmi.
1194    
1195    ----------------------------------------------------------------------
1196    Name: Allen Leung
1197    Date: 2002/03/13 17:30:00 EST
1198    Tag: leunga-20020313-x86-fp-unary
1199    Description:
1200    
1201    Bug fix for:
1202    
1203    > leunga@weaselbane:~/Yale/tmp/sml-dist{21} bin/sml
1204    > Standard ML of New Jersey v110.39.1 [FLINT v1.5], March 08, 2002
1205    > - fun f(x,(y,z)) = Real.~ y;
1206    > [autoloading]
1207    > [autoloading done]
1208    >       fchsl   (%eax), 184(%esp)
1209    > Error: MLRisc bug: X86MCEmitter.emitInstr
1210    >
1211    > uncaught exception Error
1212    >   raised at: ../MLRISC/control/mlriscErrormsg.sml:16.14-16.19
1213    
1214    The problem was that the code generator did not generate any fp registers
1215    in this case, and the ra didn't know that it needed to run the X86FP phase to
1216    translate the pseudo fp instruction.   This only happened with unary fp
1217    operators in certain situations.
1218    
1219    ----------------------------------------------------------------------
1220    Name: Matthias Blume
1221    Date: 2002/03/13 14:00:00 EST
1222    Tag: blume-20020313-overload-etc
1223    Description:
1224    
1225    1. Added _overload as a synonym for overload for backward compatibility.
1226       (Control.overloadKW must be true for either version to be accepted.)
1227    
1228    2. Fixed bug in install script that caused more things to be installed
1229       than what was requested in config/targets.
1230    
1231    3. Made CM aware of the (_)overload construct so that autoloading
1232       works.
1233    
1234    ----------------------------------------------------------------------
1235    Name: Matthias Blume
1236    Date: 2002/03/12 22:03:00 EST
1237    Tag: blume-20020312-url
1238    Description:
1239    
1240    Forgot to update BOOT and srcarchiveurl.
1241    
1242    ----------------------------------------------------------------------
1243    Name: Matthias Blume
1244    Date: 2002/03/12 17:30:00 EST
1245    Tag: blume-20020312-version110392
1246    Description:
1247    
1248    Yet another version number bump (because of small changes to the
1249    binfile format).  Version number is now 110.39.2.  NEW BOOTFILES!
1250    
1251    Changes:
1252    
1253      The new pid generation scheme described a few weeks ago was overly
1254      complicated.  I implemented a new mechanism that is simpler and
1255      provides a bit more "stability":  Once CM has seen a compilation
1256      unit, it keeps its identity constant (as long as you do not delete
1257      those crucial CM/GUID/* files).  This means that when you change
1258      an interface, compile, then go back to the old interface, and
1259      compile again, you arrive at the original pid.
1260    
1261      There now also is a mechanism that instructs CM to use the plain
1262      environment hash as a module's pid (effectively making its GUID
1263      the empty string).  For this, "noguid" must be specified as an
1264      option to the .sml file in question within its .cm file.
1265      This is most useful for code that is being generated by tools such
1266      as ml-nlffigen (because during development programmers tend to
1267      erase the tool's entire output directory tree including CM's cached
1268      GUIDs).  "noguid" is somewhat dangerous (since it can be used to locally
1269      revert to the old, broken behavior of SML/NJ, but in specific cases
1270      where there is no danger of interface confusion, its use is ok
1271      (I think).
1272    
1273      ml-nlffigen by default generates "noguid" annotations.  They can be
1274      turned off by specifying -guid in its command line.
1275    
1276    ----------------------------------------------------------------------
1277    Name: Lal George
1278    Date: 2002/03/12 12 14:42:36 EST
1279    Tag: george-20020312-frequency-computation
1280    Description:
1281    
1282    Integrated jump chaining and static block frequency into the
1283    compiler. More details and numbers later.
1284    
1285    ----------------------------------------------------------------------
1286    Name: Lal George
1287    Date: 2002/03/11 11 22:38:53 EST
1288    Tag: george-20020311-jump-chain-elim
1289    Description:
1290    
1291    Tested the jump chain elimination on all architectures (except the
1292    hppa).  This is on by default right now and is profitable for the
1293    alpha and x86, however, it may not be profitable for the sparc and ppc
1294    when compiling the compiler.
1295    
1296    The gc test will typically jump to a label at the end of the cluster,
1297    where there is another jump to an external cluster containing the actual
1298    code to invoke gc. This is to allow factoring of common gc invocation
1299    sequences. That is to say, we generate:
1300    
1301            f:
1302               testgc
1303               ja   L1      % jump if above to L1
1304    
1305            L1:
1306               jmp L2
1307    
1308    
1309    After jump chain elimination the 'ja L1' instructions is converted to
1310    'ja L2'. On the sparc and ppc, many of the 'ja L2' instructions may end
1311    up being implemented in their long form (if L2 is far away) using:
1312    
1313            jbe     L3      % jump if below or equal to L3
1314            jmp     L2
1315         L3:
1316            ...
1317    
1318    
1319    For large compilation units L2  may be far away.
1320    
1321    
1322    ----------------------------------------------------------------------
1323    Name: Matthias Blume
1324    Date: 2002/03/11 13:30:00 EST
1325    Tag: blume-20020311-mltreeeval
1326    Description:
1327    
1328    A functor parameter was missing.
1329    
1330    ----------------------------------------------------------------------
1331    Name: Allen Leung
1332    Date: 2002/03/11 10:30:00 EST
1333    Tag: leunga-20020311-runtime-string0
1334    Description:
1335    
1336       The representation of the empty string now points to a
1337    legal null terminated C string instead of unit.  It is now possible
1338    to convert an ML string into C string with InlineT.CharVector.getData.
1339    This compiles into one single machine instruction.
1340    
1341    ----------------------------------------------------------------------
1342    Name: Allen Leung
1343    Date: 2002/03/10 23:55:00 EST
1344    Tag: leunga-20020310-x86-call
1345    Description:
1346    
1347       Added machine generation for CALL instruction (relative displacement mode)
1348    
1349    ----------------------------------------------------------------------
1350    Name: Matthias Blume
1351    Date: 2002/03/08 16:05:00
1352    Tag: blume-20020308-entrypoints
1353    Description:
1354    
1355    Version number bumped to 110.39.1.  NEW BOOTFILES!
1356    
1357    Entrypoints: non-zero offset into a code object where execution should begin.
1358    
1359    - Added the notion of an entrypoint to CodeObj.
1360    - Added reading/writing of entrypoint info to Binfile.
1361    - Made runtime system bootloader aware of entrypoints.
1362    - Use the address of the label of the first function given to mlriscGen
1363      as the entrypoint.  This address is currently always 0, but it will
1364      not be 0 once we turn on block placement.
1365    - Removed the linkage cluster code (which was The Other Way(tm) of dealing
1366      with entry points) from mlriscGen.
1367    
1368    ----------------------------------------------------------------------
1369    Name: Allen Leung
1370    Date: 2002/03/07 20:45:00 EST
1371    Tag: leunga-20020307-x86-cmov
1372    Description:
1373    
1374       Bug fixes for CMOVcc on x86.
1375    
1376       1. Added machine code generation for CMOVcc
1377       2. CMOVcc is now generated in preference over SETcc on PentiumPro or above.
1378       3. CMOVcc cannot have an immediate operand as argument.
1379    
1380    ----------------------------------------------------------------------
1381    Name: Matthias Blume
1382    Date: 2002/03/07 16:15:00 EST
1383    Tag: blume-20020307-controls
1384    Description:
1385    
1386    This is a very large but mostly boring patch which makes (almost)
1387    every tuneable compiler knob (i.e., pretty much everything under
1388    Control.* plus a few other things) configurable via both the command
1389    line and environment variables in the style CM did its configuration
1390    until now.
1391    
1392    Try starting sml with '-h' (or, if you are brave, '-H')
1393    
1394    To this end, I added a structure Controls : CONTROLS to smlnj-lib.cm which
1395    implements the underlying generic mechanism.
1396    
1397    The interface to some of the existing such facilities has changed somewhat.
1398    For example, the MLRiscControl module now provides mkFoo instead of getFoo.
1399    (The getFoo interface is still there for backward-compatibility, but its
1400    use is deprecated.)
1401    
1402    The ml-build script passes -Cxxx=yyy command-line arguments through so
1403    that one can now twiddle the compiler settings when using this "batch"
1404    compiler.
1405    
1406    TODO items:
1407    
1408    We should go through and throw out all controls that are no longer
1409    connected to anything.  Moreover, we should go through and provide
1410    meaningful (and correct!) documentation strings for those controls
1411    that still are connected.
1412    
1413    Currently, multiple calls to Controls.new are accepted (only the first
1414    has any effect).  Eventually we should make sure that every control
1415    is being made (via Controls.new) exactly once.  Future access can then
1416    be done using Controls.acc.
1417    
1418    Finally, it would probably be a good idea to use the getter-setter
1419    interface to controls rather than ref cells.  For the time being, both
1420    styles are provided by the Controls module, but getter-setter pairs are
1421    better if thread-safety is of any concern because they can be wrapped.
1422    
1423    *****************************************
1424    
1425    One bug fix: The function blockPlacement in three of the MLRISC
1426    backpatch files used to be hard-wired to one of two possibilities at
1427    link time (according to the value of the placementFlag).  But (I
1428    think) it should rather sense the flag every time.
1429    
1430    *****************************************
1431    
1432    Other assorted changes (by other people who did not supply a HISTORY entry):
1433    
1434    1. the cross-module inliner now works much better (Monnier)
1435    2. representation of weights, frequencies, and probabilities in MLRISC
1436       changed in preparation of using those for weighted block placement
1437       (Reppy, George)
1438    
1439    ----------------------------------------------------------------------
1440    Name: Lal George
1441    Date: 2002/03/07 14:44:24 EST 2002
1442    Tag: george-20020307-weighted-block-placement
1443    
1444    Tested the weighted block placement optimization on all architectures
1445    (except the hppa) using AMPL to generate the block and edge frequencies.
1446    Changes were required in the machine properties to correctly
1447    categorize trap instructions. There is an MLRISC flag
1448    "weighted-block-placement" that can be used to enable weighted block
1449    placement, but this will be ineffective without block/edge
1450    frequencies (coming soon).
1451    
1452    
1453    ----------------------------------------------------------------------
1454    Name: Lal George
1455    Date: 2002/03/05 17:24:48 EST
1456    Tag: george-20020305-linkage-cluster
1457    
1458    In order to support the block placement optimization, a new cluster
1459    is generated as the very first cluster (called the linkage cluster).
1460    It contains a single jump to the 'real' entry point for the compilation
1461    unit. Block placement has no effect on the linkage cluster itself, but
1462    all the other clusters  have full freedom in the manner in which they
1463    reorder blocks or functions.
1464    
1465    On the x86 the typical linkage code that is generated is:
1466       ----------------------
1467            .align 2
1468       L0:
1469            addl    $L1-L0, 72(%esp)
1470            jmp     L1
1471    
1472    
1473            .align  2
1474       L1:
1475       ----------------------
1476    
1477    72(%esp) is the memory location for the stdlink register. This
1478    must contain the address of the CPS function being called. In the
1479    above example, it contains the address of  L0; before
1480    calling L1 (the real entry point for the compilation unit), it
1481    must contain the address for L1, and hence
1482    
1483            addl $L1-L0, 72(%esp)
1484    
1485    I have tested this on all architectures except the hppa.The increase
1486    in code size is of course negligible
1487    
1488    ----------------------------------------------------------------------
1489    Name: Allen Leung
1490    Date: 2002/03/03 13:20:00 EST
1491    Tag: leunga-20020303-mlrisc-tools
1492    
1493      Added #[ ... ] expressions to mlrisc tools
1494    
1495    ----------------------------------------------------------------------
1496    Name: Matthias Blume
1497    Date: 2002/02/27 12:29:00 EST
1498    Tag: blume-20020227-cdebug
1499    Description:
1500    
1501    - made types in structure C and C_Debug to be equal
1502    - got rid of code duplication (c-int.sml vs. c-int-debug.sml)
1503    - there no longer is a C_Int_Debug (C_Debug is directly derived from C)
1504    
1505    ----------------------------------------------------------------------
1506    Name: Matthias Blume
1507    Date: 2002/02/26 12:00:00 EST
1508    Tag: blume-20020226-ffi
1509    Description:
1510    
1511    1. Fixed a minor bug in CM's "noweb" tool:
1512       If numbering is turned off, then truly don't number (i.e., do not
1513       supply the -L option to noweb).  The previous behavior was to supply
1514       -L'' -- which caused noweb to use the "default" line numbering scheme.
1515       Thanks to Chris Richards for pointing this out (and supplying the fix).
1516    
1517    2. Once again, I reworked some aspects of the FFI:
1518    
1519       A. The incomplete/complete type business:
1520    
1521       - Signatures POINTER_TO_INCOMPLETE_TYPE and accompanying functors are
1522         gone!
1523       - ML types representing an incomplete type are now *equal* to
1524         ML types representing their corresponding complete types (just like
1525         in C).  This is still safe because ml-nlffigen will not generate
1526         RTTI for incomplete types, nor will it generate functions that
1527         require access to such RTTI.   But when ML code generated from both
1528         incomplete and complete versions of the C type meet, the ML types
1529         are trivially interoperable.
1530    
1531         NOTE:  These changes restore the full generality of the translation
1532         (which was previously lost when I eliminated functorization)!
1533    
1534       B. Enum types:
1535    
1536       - Structure C now has a type constructor "enum" that is similar to
1537         how the "su" constructor works.  However, "enum" is not a phantom
1538         type because each "T enum" has values (and is isomorphic to
1539         MLRep.Signed.int).
1540       - There are generic access operations for enum objects (using
1541         MLRep.Signed.int).
1542       - ml-nlffigen will generate a structure E_foo for each "enum foo".
1543         * The structure contains the definition of type "mlrep" (the ML-side
1544         representation type of the enum).  Normally, mlrep is the same
1545         as "MLRep.Signed.int", but if ml-nlffigen was invoked with "-ec",
1546         then mlrep will be defined as a datatype -- thus facilitating
1547         pattern matching on mlrep values.
1548         ("-ec" will be suppressed if there are duplicate values in an
1549          enumeration.)
1550         * Constructors ("-ec") or values (no "-ec") e_xxx of type mlrep
1551         will be generated for each C enum constant xxx.
1552         * Conversion functions m2i and i2m convert between mlrep and
1553         MLRep.Signed.int.  (Without "-ec", these functions are identities.)
1554         * Coversion functions c and ml convert between mlrep and "tag enum".
1555         * Access functions (get/set) fetch and store mlrep values.
1556       - By default (unless ml-nlffigen was invoked with "-nocollect"), unnamed
1557         enumerations are merged into one single enumeration represented by
1558         structure E_'.
1559    
1560    ----------------------------------------------------------------------
1561    Name: Allen Leung
1562    Date: 2002/02/25 04:45:00 EST
1563    Tag: leunga-20020225-cps-spill
1564    
1565    This is a new implementation of the CPS spill phase.
1566    The new phase is in the new file compiler/CodeGen/cpscompile/spill-new.sml
1567    In case of problems, replace it with the old file spill.sml
1568    
1569    The current compiler runs into some serious performance problems when
1570    constructing a large record.  This can happen when we try to compile a
1571    structure with many items.  Even a very simple structure like the following
1572    makes the compiler slow down.
1573    
1574        structure Foo = struct
1575           val x_1 = 0w1 : Word32.int
1576           val x_2 = 0w2 : Word32.int
1577           val x_3 = 0w3 : Word32.int
1578           ...
1579           val x_N = 0wN : Word32.int
1580        end
1581    
1582    The following table shows the compile time, from N=1000 to N=4000,
1583    with the old compiler:
1584    
1585    N
1586    1000   CPS 100 spill                           0.04u  0.00s  0.00g
1587           MLRISC ra                               0.06u  0.00s  0.05g
1588              (spills = 0 reloads = 0)
1589           TOTAL                                   0.63u  0.07s  0.21g
1590    
1591    1100   CPS 100 spill                           8.25u  0.32s  0.64g
1592           MLRISC ra                               5.68u  0.59s  3.93g
1593              (spills = 0 reloads = 0)
1594           TOTAL                                   14.71u  0.99s  4.81g
1595    
1596    1500   CPS 100 spill                           58.55u  2.34s  1.74g
1597           MLRISC ra                               5.54u  0.65s  3.91g
1598              (spills = 543 reloads = 1082)
1599           TOTAL                                   65.40u  3.13s  6.00g
1600    
1601    2000   CPS 100 spill                           126.69u  4.84s  3.08g
1602           MLRISC ra                               0.80u  0.10s  0.55g
1603              (spills = 42 reloads = 84)
1604           TOTAL                                   129.42u  5.10s  4.13g
1605    
1606    3000   CPS 100 spill                           675.59u  19.03s  11.64g
1607           MLRISC ra                               2.69u  0.27s  1.38g
1608              (spills = 62 reloads = 124)
1609           TOTAL                                   682.48u  19.61s  13.99g
1610    
1611    4000   CPS 100 spill                           2362.82u  56.28s  43.60g
1612           MLRISC ra                               4.96u  0.27s  2.72g
1613              (spills = 85 reloads = 170)
1614           TOTAL                                   2375.26u  57.21s  48.00g
1615    
1616    As you can see the old cps spill module suffers from some serious
1617    performance problem.  But since I cannot decipher the old code fully,
1618    instead of patching the problems up, I'm reimplementing it
1619    with a different algorithm.  The new code is more modular,
1620    smaller when compiled, and substantially faster
1621    (O(n log n) time and O(n) space).  Timing of the new spill module:
1622    
1623    4000  CPS 100 spill                           0.02u  0.00s  0.00g
1624          MLRISC ra                               0.25u  0.02s  0.15g
1625             (spills=1 reloads=3)
1626          TOTAL                                   7.74u  0.34s  1.62g
1627    
1628    Implementation details:
1629    
1630    As far as I can tell, the purpose of the CPS spill module is to make sure the
1631    number of live variables at any program point (the bandwidth)
1632    does not exceed a certain limit, which is determined by the
1633    size of the spill area.
1634    
1635    When the bandwidth is too large, we decrease the register pressure by
1636    packing live variables into spill records.  How we achieve this is
1637    completely different than what we did in the old code.
1638    
1639    First, there is something about the MLRiscGen code generator
1640    that we should be aware of:
1641    
1642    o MLRiscGen performs code motion!
1643    
1644       In particular, it will move floating point computations and
1645       address computations involving only the heap pointer to
1646       their use sites (if there is only a single use).
1647       What this means is that if we have a CPS record construction
1648       statement
1649    
1650           RECORD(k,vl,w,e)
1651    
1652       we should never count the new record address w as live if w
1653       has only one use (which is often the case).
1654    
1655       We should do something similar to floating point, but the transformation
1656       there is much more complex, so I won't deal with that.
1657    
1658    Secondly, there are now two new cps primops at our disposal:
1659    
1660     1. rawrecord of record_kind option
1661        This pure operator allocates some uninitialized storage from the heap.
1662        There are two forms:
1663    
1664         rawrecord NONE [INT n]  allocates a tagless record of length n
1665         rawrecord (SOME rk) [INT n] allocates a tagged record of length n
1666                                     and initializes the tag.
1667    
1668     2. rawupdate of cty
1669          rawupdate cty (v,i,x)
1670          Assigns to x to the ith component of record v.
1671          The storelist is not updated.
1672    
1673    We use these new primops for both spilling and increment record construction.
1674    
1675     1. Spilling.
1676    
1677        This is implemented with a linear scan algorithm (but generalized
1678        to trees).  The algorithm will create a single spill record at the
1679        beginning of the cps function and use rawupdate to spill to it,
1680        and SELECT or SELp to reload from it.  So both spills and reloads
1681        are fine-grain operations.  In contrast, in the old algorithm
1682        "spills" have to be bundled together in records.
1683    
1684        Ideally, we should sink the spill record construction to where
1685        it is needed.  We can even split the spill record into multiple ones
1686        at the places where they are needed.  But CPS is not a good
1687        representation for global code motion, so I'll keep it simple and
1688        am not attempting this.
1689    
1690     2. Incremental record construction (aka record splitting).
1691    
1692        Long records with many component values which are simulatenously live
1693        (recall that single use record addresses are not considered to
1694         be live) are constructed with rawrecord and rawupdate.
1695        We allocate space on the heap with rawrecord first, then gradually
1696        fill it in with rawupdate.  This is the technique suggested to me
1697        by Matthias.
1698    
1699        Some restrictions on when this is applicable:
1700        1. It is not a VECTOR record.  The code generator currently does not handle
1701           this case. VECTOR record uses double indirection like arrays.
1702        2. All the record component values are defined in the same "basic block"
1703           as the record constructor.  This is to prevent speculative
1704           record construction.
1705    
1706    ----------------------------------------------------------------------
1707    Name: Allen Leung
1708    Date: 2002/02/22 01:02:00 EST
1709    Tag: leunga-20020222-mlrisc-tools
1710    
1711    Minor bug fixes in the parser and rewriter
1712    
1713    ----------------------------------------------------------------------
1714    Name: Allen Leung
1715    Date: 2002/02/21 20:20:00 EST
1716    Tag: leunga-20020221-peephole
1717    
1718    Regenerated the peephole files.  Some contained typos in the specification
1719    and some didn't compile because of pretty printing bugs in the old version
1720    of 'nowhere'.
1721    
1722    ----------------------------------------------------------------------
1723    Name: Allen Leung
1724    Date: 2002/02/19 20:20:00 EST
1725    Tag: leunga-20020219-mlrisc-tools
1726    Description:
1727    
1728       Minor bug fixes to the mlrisc-tools library:
1729    
1730       1.  Fixed up parsing colon suffixed keywords
1731       2.  Added the ability to shut the error messages up
1732       3.  Reimplemented the pretty printer and fixed up/improved
1733           the pretty printing of handle and -> types.
1734       4.  Fixed up generation of literal symbols in the nowhere tool.
1735       5.  Added some SML keywords to to sml.sty
1736    
1737    ----------------------------------------------------------------------
1738    Name: Matthias Blume
1739    Date: 2002/02/19 16:20:00 EST
1740    Tag: blume-20020219-cmffi
1741    Description:
1742    
1743    A wild mix of changes, some minor, some major:
1744    
1745    * All C FFI-related libraries are now anchored under $c:
1746        $/c.cm      --> $c/c.cm
1747        $/c-int.cm  --> $c/internals/c-int.cm
1748        $/memory.cm --> $c/memory/memory.cm
1749    
1750    * "make" tool (in CM) now treats its argument pathname slightly
1751      differently:
1752        1. If the native expansion is an absolute name, then before invoking
1753           the "make" command on it, CM will apply OS.Path.mkRelative
1754           (with relativeTo = OS.FileSys.getDir()) to it.
1755        2. The argument will be passed through to subsequent phases of CM
1756           processing without "going native".  In particular, if the argument
1757           was an anchored path, then "make" will not lose track of that anchor.
1758    
1759    * Compiler backends now "know" their respective C calling conventions
1760      instead of having to be told about it by ml-nlffigen.  This relieves
1761      ml-nlffigen from one of its burdens.
1762    
1763    * The X86Backend has been split into X86CCallBackend and X86StdCallBackend.
1764    
1765    * Export C_DEBUG and C_Debug from $c/c.cm.
1766    
1767    * C type encoding in ml-nlffi-lib has been improved to model the conceptual
1768      subtyping relationship between incomplete pointers and their complete
1769      counterparts.  For this, ('t, 'c) ptr has been changed to 'o ptr --
1770      with the convention of instantiating 'o with ('t, 'c) obj whenever
1771      the pointer target type is complete.  In the incomplete case, 'o
1772      will be instantiated with some "'c iobj" -- a type obtained by
1773      using one of the functors PointerToIncompleteType or PointerToCompleteType.
1774    
1775      Operations that work on both incomplete and complete pointer types are
1776      typed as taking an 'o ptr while operations that require the target to
1777      be known are typed as taking some ('t, 'c) obj ptr.
1778    
1779      voidptr is now a bit "more concrete", namely "type voidptr = void ptr'"
1780      where void is an eqtype without any values.  This makes it possible
1781      to work on voidptr values using functions meant to operate on light
1782      incomplete pointers.
1783    
1784    * As a result of the above, signature POINTER_TO_INCOMPLETE_TYPE has
1785      been vastly simplified.
1786    
1787    ----------------------------------------------------------------------
1788    Name: Matthias Blume
1789    Date: 2002/02/19 10:48:00 EST
1790    Tag: blume-20020219-pqfix
1791    Description:
1792    
1793    Applied Chris Okasaki's bug fix for priority queues.
1794    
1795    ----------------------------------------------------------------------
1796    Name: Matthias Blume
1797    Date: 2002/02/15 17:05:00
1798    Tag: Release_110_39
1799    Description:
1800    
1801    Last-minute retagging is becoming a tradition... :-(
1802    
1803    This is the working release 110.39.
1804    
1805    ----------------------------------------------------------------------
1806    Name: Matthias Blume
1807    Date: 2002/02/15 16:00:00 EST
1808    Tag: Release_110_39-orig
1809    Description:
1810    
1811    Working release 110.39.  New bootfiles.
1812    
1813    (Update: There was a small bug in the installer so it wouldn't work
1814    with all shells.  So I retagged. -Matthias)
1815    
1816    ----------------------------------------------------------------------
1817    Name: Matthias Blume
1818    Date: 2002/02/15 14:17:00 EST
1819    Tag: blume-20020215-showbindings
1820    Description:
1821    
1822    Added EnvRef.listBoundSymbols and CM.State.showBindings.  Especially
1823    the latter can be useful for exploring what bindings are available at
1824    the interactive prompt.  (The first function returns only the list
1825    of symbols that are really bound, the second prints those but also the
1826    ones that CM's autoloading mechanism knows about.)
1827    
1828    ----------------------------------------------------------------------
1829    Name: Matthias Blume
1830    Date: 2002/02/15 12:08:00 EST
1831    Tag: blume-20020215-iptrs
1832    Description:
1833    
1834    Two improvements to ml-nlffigen:
1835    
1836      1. Write files only if they do not exist or if their current contents
1837         do not coincide with what's being written.  (That is, avoid messing
1838         with the time stamps unless absolutely necessary.)
1839    
1840      2. Implement a "repository" mechanism for generated files related
1841         to "incomplete pointer types".   See the README file for details.
1842    
1843    ----------------------------------------------------------------------
1844    Name: Matthias Blume
1845    Date: 2002/02/14 11:50:00 EST
1846    Tag: blume-20020214-quote
1847    Description:
1848    
1849    Added a type 't t_' to tag.sml (in ml-nlffi-lib.cm).  This is required
1850    because of the new and improved tag generation scheme.  (Thanks to Allen
1851    Leung for pointing it out.)
1852    
1853    ----------------------------------------------------------------------
1854    Name: Lal George
1855    Date: 2002/02/14 09:55:27 EST 2002
1856    Tag: george-20020214-isabelle-bug
1857    Description:
1858    
1859    Fixed the MLRISC bug sent by Markus Wenzel regarding the compilation
1860    of Isabelle on the x86.
1861    
1862    From Allen:
1863    -----------
1864     I've found the problem:
1865    
1866         in ra-core.sml, I use the counter "blocked" to keep track of the
1867         true number of elements in the freeze queue.  When the counter goes
1868         to zero, I skip examining the queue.  But I've messed up the
1869         bookkeeping in combine():
1870    
1871             else ();
1872             case !ucol of
1873               PSEUDO => (if !cntv > 0 then
1874                     (if !cntu > 0 then blocked := !blocked - 1 else ();
1875                                        ^^^^^^^^^^^^^^^^^^^^^^^
1876                      moveu := mergeMoveList(!movev, !moveu)
1877                     )
1878                  else ();
1879    
1880         combine() is called to coalesce two nodes u and v.
1881         I think I was thinking that if the move counts of u and v are both
1882         greater than zero then after they are coalesced then one node is
1883         removed from the freeze queue.  Apparently I was thinking that
1884         both u and v are of low degree, but that's clearly not necessarily true.
1885    
1886    
1887    02/12/2002:
1888        Here's the patch.  HOL now compiles.
1889    
1890        I don't know how this impact on performance (compile
1891        time or runtime).  This bug caused the RA (especially on the x86)
1892        to go thru the potential spill phase when there are still nodes on the
1893        freeze queue.
1894    
1895    
1896    
1897    
1898    ----------------------------------------------------------------------
1899    Name: Matthias Blume
1900    Date: 2002/02/13 22:40:00 EST
1901    Tag: blume-20020213-fptr-rtti
1902    Description:
1903    
1904    Fixed a bug in ml-nlffigen that was introduced with one of the previous
1905    updates.
1906    
1907    ----------------------------------------------------------------------
1908    Name: Matthias Blume
1909    Date: 2002/02/13 16:41:00 EST
1910    Tag: blume-20020213-cmlpq
1911    Description:
1912    
1913    Added new priority queue export symbols (which have just been added to
1914    smlnj-lib.cm) to CML's version of smlnj-lib.cm.  (Otherwise CML would
1915    not compile and the installer would choke.)
1916    
1917    ----------------------------------------------------------------------
1918    Name: Matthias Blume
1919    Date: 2002/02/13 16:15:00 EST
1920    Tag: blume-20020213-various
1921    Description:
1922    
1923    1. More tweaks to ml-nlffigen:
1924    
1925       - better internal datastructures (resulting in slight speedup)
1926       - "-match" option requires exact match
1927       - "localized" gensym counters (untagged structs/unions nested within
1928         other structs/unions or within typedefs get a fresh counter; their
1929         tag will be prefixed by a concatenation of their parents' tags)
1930       - bug fixes (related to calculation of transitive closure of types
1931         to be included in the output)
1932    
1933    2. Minor Basis updates:
1934    
1935       - added implementations for List.collate and Option.app
1936    
1937    ----------------------------------------------------------------------
1938    Name: Matthias Blume
1939    Date: 2002/02/11 15:55:00 EST
1940    Tag: blume-20020211-gensym
1941    Description:
1942    
1943    Added a "-gensym" option to command line of ml-nlffigen.  This can be
1944    used to specify a "stem" -- a string that is inserted in all "gensym'd"
1945    names (ML structure names that correspond to unnamed C structs, unions,
1946    and enums), so that separate runs of ml-nlffigen do not clash.
1947    
1948    ----------------------------------------------------------------------
1949    Name: Matthias Blume
1950    Date: 2002/02/11 12:05:00 EST
1951    Tag: blume-20020211-gensml
1952    Description:
1953    
1954    A quick fix for a problem with GenSML (in the pgraph-util library):
1955    Make generation of toplevel "local" optional.  (Strictly speaking,
1956    signature definitions within "local" are not legal SML.)
1957    
1958    Other than that: updates to INSTALL and cm/TODO.
1959    
1960    ----------------------------------------------------------------------
1961    Name: Matthias Blume
1962    Date: 2002/02/08 15:00:00 EST
1963    Tag: blume-20020208-uniquepid
1964    Description:
1965    
1966    0. Version number has been bumped to 110.38.1.  NEW BOOTFILES!!!
1967    
1968    1. The installer (config/install.sh) has gotten smarter:
1969    
1970         - Configuration options are a bit easier to specify now
1971           (in config/targets).
1972         - Bug in recognizing .tar.bz2 files fixed.
1973         - Installer automatically resolves dependencies between
1974           configuration options (e.g., if you ask for eXene, you will
1975           also get cml -- regardless whether you asked for it or not).
1976         - Installer can run in "quieter mode" by setting the environment
1977           variable INSTALL_QUIETLY to "true".  "Quieter" does not mean
1978           "completely silent", though.
1979         - Build HashCons library as part of smlnj-lib.
1980    
1981    2. A new scheme for assigning persistent identifiers to compilation
1982       units (and, by extension, to types etc.) has been put into place.
1983       This fixes a long-standing bug where types and even dynamic values
1984       can get internally confused, thereby compromising type safety
1985       (abstraction) and dynamic correctness.  See
1986    
1987         http://cm.bell-labs.com/cm/cs/who/blume/pid-confusion.tgz
1988    
1989       for an example of how things could go wrong until now.
1990    
1991       The downside of the new scheme is that pids are not quite as
1992       persistent as they used to be: CM will generate a fresh pid
1993       for every compilation unit that it thinks it sees for the first
1994       time.  That means that if you compile starting from a clean, fresh
1995       source tree at two different times, you end up with different
1996       binaries.
1997    
1998       Cutoff recompilation, however, has not been compromised because
1999       CM keeps pid information in special caches between runs.
2000    
2001    ----------------------------------------------------------------------
2002    Name: Lal George
2003    Date: 2002/02/07 15:34:13 EST 2002
2004    Tag: <none>
2005    Description:
2006    
2007    Compilers that generate assembly code may produce  global labels
2008    whose value is resolved at link time. The various peephole optimization
2009    modules did not take this in account.
2010    
2011    TODO. The Labels.addrOf function should really return an option
2012    type so that clients are forced to deal with this issue, rather
2013    than an exception being raised.
2014    
2015    ----------------------------------------------------------------------
2016    Name: Lal George
2017    Date: 2002/02/06 13:55:02 EST
2018    Tag: george-20020206-ra-breakup
2019    Description:
2020    
2021    1. A bug fix from Allen.
2022    
2023        A typo causes extra fstp %st(0)'s to be generated at compensation
2024        edges, which might cause stack underflow traps at runtime.  This
2025        occurs in fft where there are extraneous fstps right before the 'into'
2026        trap instruction (in this case they are harmless since none of the
2027        integers overflow.)
2028    
2029    2. Pulled out various utility modules that were embedded in the modules
2030       of the register allocator. I need these modules for other purposes, but
2031       they are not complete enough to put into a library (just yet).
2032    ----------------------------------------------------------------------
2033    Name: Matthias Blume
2034    Date: 2002/01/31 16:05:00 EST
2035    Tag: blume-20020131-sparc-ccalls
2036    Description:
2037    
2038    1. C-calls on Sparc needlessly allocated a huge chunk (96 bytes)
2039       of extra stack space by mistake.  Fixed.
2040    
2041    2. Bug in logic of handling of command-line options in ml-nlffigen fixed.
2042    
2043    ----------------------------------------------------------------------
2044    Name: Allen Leung
2045    Date: 2002/01/30
2046    Tag: leunga-20020130-nowhere-bug-fix
2047    Description:
2048    
2049       MLRISC bug fixes:
2050       1. Fixed a bindings computation bug in the 'nowhere' program generator tool.
2051       2. MachineInt.fromString was negating its value.
2052    
2053    ----------------------------------------------------------------------
2054    Name: Matthias Blume
2055    Date: 2002/01/29
2056    Tag: blume-20020129-INSTALL
2057    Description:
2058    
2059    - Added somewhat detailed installation instructions (file INSTALL).
2060    - Fixed curl-detection bug in config/install.sh.
2061    - It is now possible to select the URL getter using the URLGETTER
2062      environment variable:
2063    
2064          not set / "unknown"      --> automatic detection (script tries wget,
2065                                       curl, and lynx)
2066          "wget" / "curl" / "lynx" --> use the specified program (script "knows"
2067                                       how to properly invoke them)
2068          other                    --> use $URLGETTER directly, it must take
2069                                       precisely two command-line arguments
2070                                       (source URL and destination file name)
2071    
2072    ----------------------------------------------------------------------
2073    Name: Matthias Blume
2074    Date: 2002/01/28
2075    Tag: blume-20020128-sparc-ccalls
2076    Description:
2077    
2078    - Fixed problem with calculation of "used" registers in sparc-c-calls.
2079    - Make use of the allocParam argument in sparc-c-calls.
2080    
2081    ----------------------------------------------------------------------
2082    Name: Matthias Blume
2083    Date: 2002/01/28
2084    Tag: blume-20020128-allocParam
2085    Description:
2086    
2087    John Reppy:  Changes c-calls API to accept client-callback for
2088    allocating extra stack space.
2089    me: Corresponding changes to mlriscGen (using a dummy argument that
2090        does not change the current behavior).
2091    
2092    ----------------------------------------------------------------------
2093    Name: Matthias Blume
2094    Date: 2002/01/28 12:00:00
2095    Tag: Release_110_38
2096    Description:
2097    
2098    This time for real!!!
2099    
2100    ----------------------------------------------------------------------
2101    Name: Matthias Blume
2102    Date: 2002/01/28 10:56:00 EST
2103    Tag: blume-20020128-retraction
2104    Description:
2105    
2106    0. Retracted earlier 110.38.  (The Release_110_38 tag has been replaced
2107       with blume-Release_110_38-retracted.)
2108    
2109    1. Fixed a problem with incorrect rounding modes in real64.sml.
2110       (Thanks to Andrew Mccreight <andrew.mccreight@yale.edu>.)
2111    
2112    2. A bug in ml-nlffigen related to the handling of unnamed structs, unions,
2113       and enums fixed.  The naming of corresponding ML identifiers should
2114       now be consistent again.
2115    
2116    ----------------------------------------------------------------------
2117    Name: Allen Leung
2118    Date: 2002/01/27
2119    Tag: leunga-20020127-nowhere
2120    Description:
2121    
2122       Added a target called nowhere in the configuration scripts.
2123       Enabling this will build the MLRISC 'nowhere' tool (for translating
2124       programs with where-clauses into legal SML code) during installation.
2125    
2126    ----------------------------------------------------------------------
2127    Name: Matthias Blume
2128    Date: 2002/01/25 21:27:00 EST
2129    Tag: blume-Release_110_38-retracted
2130    Description:
2131    
2132    Call it a (working) release!  Version is 110.38. Bootfiles are ready.
2133    
2134    README will be added later.
2135    
2136    !!! NOTE:  Re-tagged as blume-Release_110_38-retracted. Original tag
2137    (Release_110_38) removed.  Reason: Last-minute bug fixes.
2138    
2139    ----------------------------------------------------------------------
2140    Name: Matthias Blume
2141    Date: 2002/01/25
2142    Tag: blume-20020125-ffi
2143    Description:
2144    
2145    A large number of tweaks and improvements to ml-nlffi-lib and
2146    ml-nlffigen:
2147    
2148       - ML represenation types have been streamlined
2149       - getter and setter functions work with concrete values, not abstract
2150         ones where possible
2151       - ml-nlffigen command line more flexible (see README file there)
2152       - some bugs have been fixed (hopefully)
2153    
2154    ----------------------------------------------------------------------
2155    Name: Lal George
2156    Date: 2002/01/24
2157    Tag: george-20020124-risc-ra-interface
2158    Description:
2159    
2160       There is a dramatic simplification in the interface to the
2161       register allocator for RISC architectures as a result of making
2162       parallel copy instructions explicit.
2163    
2164    ----------------------------------------------------------------------
2165    Name: Matthias Blume
2166    Date: 2002/01/22
2167    Tag: blume-20020122-x86-ccalls
2168    Description:
2169    
2170    Bug fix for c-calls on x86 (having to do with how char- and
2171    short-arguments are being handled).
2172    
2173    ----------------------------------------------------------------------
2174    Name: Matthias Blume
2175    Date: 2002/01/21
2176    Tag: blume-20020121-ff
2177    Description:
2178    
2179    Another day of fiddling with the FFI...
2180    
2181    1. Bug fix/workaround:  CKIT does not complain about negative array
2182       dimensions, so ml-nlffigen has to guard itself against this possibility.
2183       (Otherwise a negative dimension would send it into an infinite loop.)
2184    
2185    2. Some of the abstract types (light objects, light pointers, most "base"
2186       types) in structure C are now eqtypes.
2187    
2188    3. Added constructors and test functions for NULL function pointers.
2189    
2190    ----------------------------------------------------------------------
2191    Name: Matthias Blume
2192    Date: 2002/01/18
2193    Tag: blume-20020118-ready-for-new-release
2194    Description:
2195    
2196    Made config/srcarchiveurl point to a new place.  (Will provide boot
2197    files shortly.)
2198    
2199    Maybe we christen this to be 110.38?
2200    
2201    ----------------------------------------------------------------------
2202    Name: Matthias Blume
2203    Date: 2002/01/18
2204    Tag: blume-20020118-more-ffifiddle
2205    Description:
2206    
2207    Today's FFI fiddling:
2208    
2209      - Provided a structure CGetSet with "convenient" versions of C.Get.* and
2210        C.Set.* that use concrete (MLRep.*) arguments and results instead
2211        of abstract ones.
2212    
2213      - Provided word-style bit operations etc. for "int" representation
2214        types in MLRep.S<Foo>Bitops where <Foo> ranges over Char, Int, Short,
2215        and Long.
2216    
2217    ----------------------------------------------------------------------
2218    Name: Matthias Blume
2219    Date: 2002/01/18
2220    Tag: blume-20020118-use-x86-fp
2221    Description:
2222    
2223    Now that x86-fast-fp seems to be working, I turned it back on again
2224    by default.  (Seems to work fine now, even with the FFI.)
2225    
2226    Other than that, I added some documentation about the FFI to
2227    src/ml-nlffigen/README and updated the FFI test examples in
2228    src/ml-nlffi-lib/Tests/*.
2229    
2230    ----------------------------------------------------------------------
2231    Name: Allen Leung
2232    Date: 2002/01/17
2233    Tag: leunga-20020117-x86-fast-fp-call
2234    Description:
2235    
2236       1. Fixed a problem with handling return fp values when x86's fast fp
2237          mode is turned on.
2238    
2239       2. Minor pretty printing fix for cellset.  Print %st(0) as %st(0) instead
2240          of %f32.
2241    
2242       3. Added a constructor INT32lit to the ast of MLRISC tools.
2243    
2244    ----------------------------------------------------------------------
2245    Name: Matthias Blume
2246    Date: 2002/01/16
2247    Tag: blume-20020116-ffifiddle
2248    Description:
2249    
2250    More fiddling with the FFI interface:
2251    
2252     - Make constness 'c instead of rw wherever possible.  This eliminates
2253       the need for certain explicit coercions.  (However, due to ML's
2254       value polymorphism, there will still be many cases where explicit
2255       coercions are necessary.  Phantom types are not the whole answer
2256       to modeling a subtyping relationship in ML.)
2257    
2258     - ro/rw coersions for pointers added.  (Avoids the detour through */&.)
2259    
2260     - "printf" test example added to src/ml-nlffi-lib/Tests.  (Demonstrates
2261       clumsy workaround for varargs problem.)
2262    
2263    ----------------------------------------------------------------------
2264    Name: Lal George
2265    Date: 2002/01/15
2266    Tag: <none>
2267    Description:
2268    
2269    1. Since COPY instructions are no longer native to the architecture,
2270       a generic functor can be used to implement the expandCopies function.
2271    
2272    2. Allowed EXPORT and IMPORT pseudo-op declarations to appear inside a
2273       TEXT segment.
2274    
2275    ----------------------------------------------------------------------
2276    Name: Matthias Blume
2277    Date: 2002/01/15
2278    Tag: blume-20020115-ffiupdates
2279    Description:
2280    
2281    1. Fix for bug resulting in single-precision float values being returned
2282       incorrectly from FFI calls.
2283    
2284    2. Small modifications to C FFI API:
2285    
2286        - memory-allocation routines return straight objects (no options)
2287          and raise an exception in out-of-memory situations
2288        - unsafe extensions to cast between function pointers and pointers
2289          from/to ints
2290        - added structure C_Debug as an alternative to structure C where
2291          pointer-dereferencing (|*| and |*!) always check for null-pointers
2292        - added open_lib' to DynLinkage;  open_lib' works like open_lib
2293          but also takes a (possibly empty) list of existing library handles
2294          that the current library depends on
2295    
2296    ----------------------------------------------------------------------
2297    Name: Matthias Blume
2298    Date: 2002/01/10
2299    Tag: blume-20020110-newffigen
2300    Description:
2301    
2302    1. Updates to portable graph code.
2303    
2304    2. Major update to ml-nlffigen and ml-nlffi-lib.  Things are much
2305       more scalable now so that even huge interfaces such as the one
2306       for GTK compile in finite time and space. :-)
2307       See src/ml-nlffigen/README for details on what's new.
2308    
2309    ----------------------------------------------------------------------
2310    Name: Lal George
2311    Date: 2001/01/09 14:31:35 EST 2002
2312    Tag: george-20011206-rm-native-copy
2313    Description:
2314    
2315            Removed the native COPY and FCOPY instructions
2316            from all the architectures and replaced it with the
2317            explicit COPY instruction from the previous commit.
2318    
2319            It is now possible to simplify many of the optimizations
2320            modules that manipulate copies. This has not been
2321            done in this change.
2322    
2323    ----------------------------------------------------------------------
2324    Name: Lal George
2325    Date: 2001/12/06 16:50:13 EST 2001
2326    Tag: george-20011206-mlrisc-instruction
2327    Description:
2328    
2329    Changed the representation of instructions from being fully abstract
2330    to being partially concrete. That is to say:
2331    
2332      from
2333            type instruction
2334    
2335      to
2336            type instr                              (* machine instruction *)
2337    
2338            datatype instruction =
2339                LIVE of {regs: C.cellset, spilled: C.cellset}
2340              | KILL of {regs: C.cellset, spilled: C.cellset}
2341              | COPYXXX of {k: CB.cellkind, dst: CB.cell list, src: CB.cell list}
2342              | ANNOTATION of {i: instruction, a: Annotations.annotation}
2343              | INSTR of instr
2344    
2345    This makes the handling of certain special instructions that appear on
2346    all architectures easier and uniform.
2347    
2348    LIVE and KILL say that a list of registers are live or killed at the
2349    program point where they appear. No spill code is generated when an
2350    element of the 'regs' field is spilled, but the register is moved to
2351    the 'spilled' (which is present, more for debugging than anything else).
2352    
2353    LIVE replaces the (now deprecated) DEFFREG instruction on the alpha.
2354    We used to generate:
2355    
2356            DEFFREG f1
2357            f1 := f2 + f3
2358            trapb
2359    
2360    but now generate:
2361    
2362            f1 := f2 + f3
2363            trapb
2364            LIVE {regs=[f1,f2,f3], spilled=[]}
2365    
2366    Furthermore, the DEFFREG (hack) required that all floating point instruction
2367    use all registers mentioned in the instruction. Therefore f1 := f2 + f3,
2368    defines f1 and uses [f1,f2,f3]! This hack is no longer required resulting
2369    in a cleaner alpha implementation. (Hopefully, intel will not get rid of
2370    this architecture).
2371    
2372    COPYXXX is intended to replace the parallel COPY and FCOPY  available on
2373    all the architectures. This will result in further simplification of the
2374    register allocator that must be aware of them for coalescing purposes, and
2375    will also simplify certain aspects of the machine description that provides
2376    callbacks related to parallel copies.
2377    
2378    ANNOTATION should be obvious, and now INSTR represents the honest to God
2379    machine instruction set!
2380    
2381    The <arch>/instructions/<arch>Instr.sml files define certain utility
2382    functions for making porting easier -- essentially converting upper case
2383    to lower case. All machine instructions (of type instr) are in upper case,
2384    and the lower case form generates an MLRISC instruction. For example on
2385    the alpha we have:
2386    
2387      datatype instr =
2388         LDA of {r:cell, b:cell, d:operand}
2389       | ...
2390    
2391      val lda : {r:cell, b:cell, d:operand} -> instruction
2392        ...
2393    
2394    where lda is just (INSTR o LDA), etc.
2395    
2396    ----------------------------------------------------------------------
2397    Name: Matthias Blume
2398    Date: 2001/11/22 21:40:00 EST
2399    Tag: Release_110_37
2400    Description:
2401    
2402    Release 110.37.  This time for real.
2403    
2404    ----------------------------------------------------------------------
2405    Name: Matthias Blume
2406    Date: 2001/11/21 16:35:00 EST
2407    Tag: blume-20011121-foot-in-mouth
2408    Description:
2409    
2410    Removed the "Release_110_37" tag because of a serious bug.
2411    This will be re-tagged once the bug is fixed.
2412    
2413    ----------------------------------------------------------------------
2414    Name: Matthias Blume
2415    Date: 2001/11/21 16:14:00 EST
2416    Tag: blume-20011121-forgottenfile
2417    Description:
2418    
2419    Forgot to add a file.  (Just a .tex-file -- part of
2420    the CM manual source.)
2421    
2422    ----------------------------------------------------------------------
2423    Name: Matthias Blume
2424    Date: 2001/11/21 16:10:00 EST
2425    Tag: blume-20011121-invalid_110_37
2426    Description:
2427    
2428    Note: I removed the original tag "Release_110_37" from this commit
2429          because we found a serious bug in all non-x86 backends.
2430          - Matthias
2431    
2432    1. Modifications to the SML/NJ code generator and to the runtime system
2433       so that code object name strings are directly inserted into code
2434       objects at code generation time.  The only business the runtime system
2435       has with this is now to read the name strings on occasions.
2436       (The encoding of the name string has also changed somewhat.)
2437    
2438    2. CM now implements a simple "set calculus" for specifying export lists.
2439       In particular, it is now possible to refer to the export lists of
2440       other libraries/groups/sources and form unions as well as differences.
2441       See the latest CM manual for details.
2442    
2443    3. An separate notion of "proxy" libraries has again be eliminated from
2444       CM's model.  (Proxy libraries are now simply a special case of using
2445       the export list calculus.)
2446    
2447    4. Some of the existing libraries now take advantage of the new set
2448       calculus.
2449       (Notice that not all libraries have been converted because some
2450       of the existing .cm-files are supposed to be backward compatible
2451       with 110.0.x.)
2452    
2453    5. Some cleanup in stand-alone programs.  (Don't use "exnMessage" -- use
2454       "General.exnMessage"!  The former relies on a certain hook to be
2455       initialized, and that often does not happen in the stand-alone case.)
2456    
2457    ----------------------------------------------------------------------
2458    Name: Lal George
2459    Date: 2001/11/21  13:56:18 EST
2460    Tag: george-2001121-pseudo-ops
2461    Description:
2462    
2463      Implemented a complete redesign of MLRISC pseudo-ops. Now there
2464      ought to never be any question of incompatabilities with
2465      pseudo-op syntax expected by host assemblers.
2466    
2467      For now, only modules supporting GAS syntax are implemented
2468      but more should follow, such as MASM, and vendor assembler
2469      syntax, e.g. IBM as, Sun as, etc.
2470    
2471    ----------------------------------------------------------------------
2472    Name: Matthias Blume
2473    Date: 2001/11/14 11:52:00 EST
2474    Tag: blume-20011114-srcname
2475    Description:
2476    
2477    1. Routed the name of the current source file to mlriscgen where it
2478       should be directly emitted into the code object.  (This last part
2479       is yet to be done.)
2480    
2481    2. Some cleanup of the pgraph code to make it match the proposal that
2482       I put out the other day.  (The proposal notwithstanding, things are
2483       still in flux here.)
2484    
2485    ----------------------------------------------------------------------
2486    Name: Lal George
2487    Date: 2001/11/14 09:44:04 EST
2488    Tag:
2489    Description:
2490    
2491      Fix for a backpatching bug reported by Allen.
2492    
2493      Because the boundary between short and long span-dependent
2494      instructions is +/- 128, there are an astounding number of
2495      span-dependent instructions whose size is over estimated.
2496    
2497      Allen came up with the idea of letting the size of span
2498      dependent instructions be non-monotonic, for a maxIter
2499      number of times, after which the size must be monotonically
2500      increasing.
2501    
2502      This table shows the number of span-dependent instructions
2503      whose size was over-estimated as a function of maxIter, for the
2504      file Parse/parse/ml.grm.sml:
2505    
2506         maxIter            # of instructions:
2507            10                      687
2508            20                      438
2509            30                      198
2510            40                        0
2511    
2512      In compiling the compiler, there is no significant difference in
2513      compilation speed between maxIter=10 and maxIter=40. Actually,
2514      my measurements showed that maxIter=40 was a tad faster than
2515      maxIter=10! Also 96% of the  files in the compiler reach a fix
2516      point within 13 iterations, so fixing maxIter at 40, while high,
2517      is okay.
2518    
2519    ----------------------------------------------------------------------
2520    Name: Matthias Blume
2521    Date: 2001/10/31 15:25:00 EST
2522    Tag: blume-20011031-pgraph
2523    Description:
2524    
2525    CKIT:
2526    * Changed the "Function" constructor of type Ast.ctype to carry optional
2527      argument identifiers.
2528    * Changed the return type of TypeUtil.getFunction accordingly.
2529    * Type equality ignores the argument names.
2530    * TypeUtil.composite tries to preserve argument names but gives up quickly
2531      if there is a mismatch.
2532    
2533    installation script:
2534    * attempts to use "curl" if available (unless "wget" is available as well)
2535    
2536    CM:
2537    * has an experimental implementation of "portable graphs" which I will
2538      soon propose as an implementation-independent library format
2539    * there are also new libraries $/pgraph.cm and $/pgraph-util.cm
2540    
2541    NLFFI-LIB:
2542    * some cleanup (all cosmetic)
2543    
2544    NLFFIGEN:
2545    * temporarily disabled the mechanism that suppresses ML output for
2546      C definitions whose identifiers start with an underscore character
2547    * generate val bindings for enum constants
2548    * user can request that only one style (light or heavy) is being used;
2549      default is to use both (command-line arguments: -heavy and -light)
2550    * fixed bug in handling of function types involving incomplete pointers
2551    * generate ML entry points that take record arguments (i.e., using
2552      named arguments) for C functions that have a prototype with named
2553      arguments
2554      (see changes to CKIT)
2555    
2556    ----------------------------------------------------------------------
2557    Name: Allen Leung
2558    Date: 2001/10/27 20:34:00 EDT
2559    Tag: leunga-20011027-x86-fast-fp-call
2560    Description:
2561    
2562       Fixed the bug described in blume-20010920-slowfp.
2563    
2564       The fix involves
2565          1. generating FCOPYs in FSTP in ia32-svid
2566          2. marking a CALL with the appropriate annotation
2567    
2568    ----------------------------------------------------------------------
2569    Name: Matthias Blume
2570    Date: 2001/10/16 11:32:00 EDT
2571    Tag: blume-20011016-netbsd
2572    Description:
2573    
2574    Underscore patch from Chris Richards (fixing problem with compiling
2575    runtime system under recent NetBSD).
2576    
2577    ----------------------------------------------------------------------
2578    Name: Allen Leung
2579    Date: 2001/10/12 17:18:32 EDT 2001
2580    Tag: leung-20011012-x86-printflowgraph
2581    Description:
2582    
2583    X86RA now uses a valid (instead of dummy) PrintFlowgraph module.
2584    
2585    ----------------------------------------------------------------------
2586    Name: Lal George
2587    Date: 2001/10/11 23:51:34 EDT
2588    Tag: george-20011011-too-many-instrs
2589    Description:
2590    
2591    The representation of a program point never expected to see more
2592    than 65536 instructions in a basic block!
2593    
2594    ----------------------------------------------------------------------
2595    Name: Lal George
2596    Date: 2001/10/09 09:41:37 EDT
2597    Tag: george-20011008-mlrisc-labels
2598    Description:
2599    
2600    Changed the machine description files to support printing of
2601    local and global labels in assembly code, based on host assembler
2602    conventions.
2603    
2604    ----------------------------------------------------------------------
2605    Name: Matthias Blume
2606    Date: 2001/09/25 15:25:00 EDT
2607    Tag: blume-20010925-exninfo
2608    Description:
2609    
2610    I provided a non-hook implementation of exnName (at the toplevel) and
2611    made the "dummy" implementation of exnMessage (at the toplevel) more
2612    useful: if nothing gets "hooked in", then at least you are going to
2613    see the exception name and a message indicating why you don't see more.
2614    
2615    [For the time being, programs that need exnMessage and want to use
2616    ml-build should either use General.exnMessage (strongly recommended) or
2617    refer to structure General at some other point so that CM sees a
2618    static dependency.]
2619    
2620    [Similar remarks go for "print" and "use":  If you want to use their
2621    functionality in stand-alone programs generated by ml-build, then use
2622    TextIO.output and Backend.Interact.useFile (from $smlnj/compiler.cm).]
2623    
2624    ----------------------------------------------------------------------
2625    Name: Matthias Blume
2626    Date: 2001/09/20 17:28:00 EDT
2627    Tag: blume-20010920-slowfp
2628    Description:
2629    
2630    Allen says that x86-fast-fp is not safe yet, so I turned it off again...
2631    
2632    ----------------------------------------------------------------------
2633    Name: Matthias Blume
2634    Date: 2001/09/20 17:20:00 EDT
2635    Tag: blume-20010920-canonicalpaths
2636    Description:
2637    
2638    0. Updated the BOOT file (something that I forgot to do earlier).
2639    
2640    1. Small internal change to CM so that it avoids "/../" in filenames
2641       as much as possible (but only where it is safe).
2642    
2643    2. Changed config/_run-sml (resulting in a changed bin/.run-sml) so
2644       that arguments that contain delimiters are passed through correctly.
2645       This change also means that all "special" arguments of the form
2646       @SMLxxx... must come first.
2647    
2648    3. Changed install script to put relative anchor names for tool commands
2649       into pathconfig.
2650    
2651    ----------------------------------------------------------------------
2652    Name: Matthias Blume
2653    Date: 2001/09/18 15:35:00 EDT
2654    Tag: blume-20010918-readme11036
2655    Description:
2656    
2657    Added README files.
2658    
2659    ----------------------------------------------------------------------
2660    Name: Matthias Blume
2661    Date: 2001/09/18 11:45:00 EDT
2662    Tag: Release_110_36 (retag)
2663    Description:
2664    
2665    Fixed mistake in config/preloads. Retagged as 110.36.
2666    
2667    ----------------------------------------------------------------------
2668    Name: Matthias Blume
2669    Date: 2001/09/18 09:40:00 EDT
2670    Tag: Release_110_36_orig (tag changed)
2671    Description:
2672    
2673    New version (110.36).  New bootfiles.
2674    
2675    ----------------------------------------------------------------------
2676    Name: Matthias Blume
2677    Date: 2001/09/14 16:15:00 EDT
2678    Tag: blume-20010914-x86fastfp
2679    Description:
2680    
2681    John committed some changes that Allen made, in particular a (hopefully)
2682    correctly working version of the x86-fp module.
2683    
2684    I changed the default setting of the Control.MLRISC.getFlag "x86-fast-fp"
2685    flag to "true".  Everything seems to compile to a fixpoint ok, and
2686    "mandelbrot" speeds up by about 15%.
2687    
2688    ----------------------------------------------------------------------
2689    Name: Matthias Blume
2690    Date: 2001/09/13 11:20:00 EDT
2691    Tag: blume-20010913-minimal
2692    Description:
2693    
2694    1. Stefan Monnier's patch to fix a miscompilation problem that
2695       was brought to light by John Reppy's work on Moby.
2696    
2697    2. Implemented a minimal "structure Compiler" that contains just
2698       "version" and "architecture".  The minimal version will be
2699       available when the full version is not.  This is for backward-
2700       compatibility with code that wants to test Compiler.version.
2701    
2702    ----------------------------------------------------------------------
2703    Name: Matthias Blume
2704    Date: 2001/08/28 14:03:00 EDT
2705    Tag: blume-20010828-ml-lex
2706    Description:
2707    
2708    Fix for bug 1581, received from Neophytos Michael.
2709    
2710    ----------------------------------------------------------------------
2711    Name: Matthias Blume
2712    Date: 2001/08/27 11:20:00 EDT
2713    Tag: blume-20010827-readme11035
2714    Description:
2715    
2716    Fleshed out the README file for 110.35.
2717    
2718    ----------------------------------------------------------------------
2719    Name: Matthias Blume
2720    Date: 2001/08/24 17:10:00 EDT
2721    Tag: Release_110_35
2722    Description:
2723    
2724    New version number (110.35).  New bootfiles.
2725    
2726    ----------------------------------------------------------------------
2727    Name: Lal George
2728    Date: 2001/08/24 13:47:18 EDT 2001
2729    Tag: george-20010824-MLRISC-graphs
2730    Description:
2731    
2732     removed clusters from MLRISC completely and replaced with graphs.
2733    
2734    ----------------------------------------------------------------------
2735    Name: Matthias Blume
2736    Date: 2001/08/23 17:50:00 EDT
2737    Tag: blume-20010823-toplevel
2738    Description:
2739    
2740    - some reorganization of the code that implements various kinds of
2741      environments in the compiler (static, dynamic, symbolic, combined)
2742    - re-implemented the EnvRef module so that evalStream works properly
2743      (if the stream contains references to "use", "CM.make", etc.)
2744    - cleaned up evalloop.sml and interact.sml (but they need more cleaning)
2745    
2746    ----------------------------------------------------------------------
2747    Name: Matthias Blume
2748    Date: 2001/08/20 15:50 EDT
2749    Tag: blume20010820-slipup
2750    Description:
2751    
2752    I forgot to commit a few files.  Here they are...
2753    
2754    ----------------------------------------------------------------------
2755    Name: Matthias Blume
2756    Date: 2001/08/20 15:35:00 EDT
2757    Tag: blume-20010820-debugprof
2758    Description:
2759    
2760    !!!! NEW BOOTFILES !!!!
2761    
2762    This is another round of reorganizing the compiler sources.  This
2763    time the main goal was to factor out all the "instrumentation"
2764    passes (for profiling and backtracing) into their own library.
2765    The difficulty was to do it in such a way that it does not depend
2766    on elaborate.cm but only on elabdata.cm.
2767    
2768    Therefore there have been further changes to both elaborate.cm and
2769    elabdata.cm -- more "generic" things have been moved from the former
2770    to the latter.  As a result, I was forced to split the assignment
2771    of numbers indicating "primtyc"s into two portions: SML-generic and
2772    SML/NJ-specific.  Since it would have been awkward to maintain,
2773    I bit the bullet and actually _changed_ the mapping between these
2774    numbers and primtycs.  The bottom line of this is that you need
2775    a new set of bin- and bootfiles.
2776    
2777    I have built new bootfiles for all architectures, so doing a fresh
2778    checkout and config/install.sh should be all you need.
2779    
2780    The newly created library's name is
2781    
2782        $smlnj/viscomp/debugprof.cm
2783    
2784    and its sources live under
2785    
2786        src/compiler/DebugProf
2787    
2788    ----------------------------------------------------------------------
2789    Name: Matthias Blume
2790    Date: 2001/08/15 17:15:00 EDT
2791    Tag: blume-20010815-compreorg
2792    Description:
2793    
2794    This is a first cut at reorganizing the CM libraries that make up the
2795    core of the compiler.  The idea is to separate out pieces that could
2796    be used independently by tools, e.g., the parser, the typechecker, etc.
2797    
2798    The current status is a step in this direction, but it is not quite
2799    satisfactory yet.  Expect more changes in the future.
2800    
2801    Here is the current (new) organization...
2802    
2803        What used to be $smlnj/viscomp/core.cm is now divided into
2804        six CM libraries:
2805    
2806             $smlnj/viscomp/basics.cm
2807                           /parser.cm
2808                           /elabdata.cm
2809                           /elaborate.cm
2810                           /execute.cm
2811                           /core.cm
2812    
2813        The CM files for these libraries live under src/system/smlnj/viscomp.
2814        All these libraries are proxy libraries that contain precisely
2815        one CM library component.  Here are the locations of the components
2816        (all within the src/compiler tree):
2817    
2818             Basics/basics.cm
2819             Parse/parser.cm
2820             ElabData/elabdata.cm
2821             Elaborator/elaborate.cm
2822             Execution/execute.cm
2823             core.cm
2824    
2825         [This organization is the same that has been used already
2826         for a while for the architecture-specific parts of the visible
2827         compiler and for the old version of core.cm.]
2828    
2829         As you will notice, many source files have been moved from their
2830         respective original locations to a new home in one of the above
2831         subtrees.
2832    
2833         The division of labor between the new libraries is the following:
2834    
2835             basics.cm:
2836                - Simple, basic definitions that pertain to many (or all) of
2837                  the other libraries.
2838             parser.cm:
2839                - The SML parser, producing output of type Ast.dec.
2840                - The type family for Ast is also defined and exported here.
2841             elabdata.cm:
2842                - The datatypes that describe input and output of the elaborator.
2843                  This includes types, absyn, and static environments.
2844             elaborator.cm:
2845                - The SML/NJ type checker and elaborator.
2846                  This maps an Ast.dec (with a given static environment) to
2847                  an Absyn.dec (with a new static environment).
2848                - This libraries implements certain modules that used to be
2849                  structures as functors (to remove dependencies on FLINT).
2850             execute.cm:
2851                - Everything having to do with executing binary code objects.
2852                - Dynamic environments.
2853             core.cm:
2854                - SML/NJ-specific instantiations of the elaborator and MLRISC.
2855                - Top-level modules.
2856                - FLINT (this should eventually become its own library)
2857    
2858    Notes:
2859    
2860    I am not 100% happy with the way I separated the elaborator (and its
2861    data structures) from FLINT.  Two instances of the same problem:
2862    
2863        1. Data structures contain certain fields that carry FLINT-specific
2864           information.  I hacked around this using exn and the property list
2865           module from smlnj-lib.  But the fact that there are middle-end
2866           specific fields around at all is a bit annoying.
2867    
2868        2. The elaborator calculates certain FLINT-related information.  I tried
2869           to make this as abstract as I could using functorization, but, again,
2870           the fact that the elaborator has to perform calculations on behalf
2871           of the middle-end at all is not nice.
2872    
2873        3. Having to used exn and property lists is unfortunate because it
2874           weakens type checking.  The other alternative (parameterizing
2875           nearly *everything*) is not appealing, though.
2876    
2877    I removed the "rebinding =" warning hack because due to the new organization
2878    it was awkward to maintain it.  As a result, the compiler now issues some of
2879    these warnings when compiling init.cmi during bootstrap compilation. On
2880    the plus side, you also get a warning when you do, for example:
2881       val op = = Int32.+
2882    which was not the case up to now.
2883    
2884    I placed "assign" and "deref" into the _Core structure so that the
2885    code that deals with the "lazy" keyword can find them there.  This
2886    removes the need for having access to the primitive environment
2887    during elaboration.
2888    
2889    ----------------------------------------------------------------------
2890    Name: Matthias Blume
2891    Date: 2001/08/13
2892    Tag: blume-20010813-closures
2893    Description:
2894    
2895    This fix was sent to us by Zhong Shao.  It is supposed to improve the
2896    performance of certain loops by avoiding needless closure allocation.
2897    
2898    ----------------------------------------------------------------------
2899    Name: Lal George
2900    Date: 2001/07/31 10:03:23 EDT 2001
2901    Tag: george-20010731-x86-fmalloc
2902    Description: Fixed bug in x86 calls
2903    
2904        There was a bug where call instructions would mysteriously
2905        vanish. The call instruction had to be one that returned
2906        a floating point value.
2907    
2908    ----------------------------------------------------------------------
2909    Name: Lal George
2910    Date: 2001/07/19 16:36:29 EDT 2001
2911    Tag: george-20010719-simple-cells
2912    Description:
2913    
2914    I have dramatically simplified the interface for CELLS in MLRISC.
2915    
2916    In summary, the cells interface is broken up into three parts:
2917    
2918      1. CellsBasis : CELLS_BASIS
2919    
2920            CellsBasis is a top level structure and common for all
2921            architectures.  it contains the definitions of basic datatypes
2922            and utility  functions over these types.
2923    
2924      2. functor Cells() : CELLS
2925    
2926            Cells generates an interface for CELLS that incorporates the
2927            specific resources on the target architecture, such as the
2928            presence of special register classes, their number and size,
2929            and various useful substructures.
2930    
2931      3. <ARCH>CELLS
2932    
2933            e.g. SparcCells: SPARCCELLS
2934    
2935            <ARCH>CELLS usually contains additional bindings for special
2936            registers  on the architecture, such as:
2937    
2938                    val r0 : cell           (* register zero *)
2939                    val y : cell            (* Y register *)
2940                    val psr : cell          (* processor status register *)
2941                    ...
2942    
2943            The structure returned by applying the Cells functor is opened
2944            in this interface.
2945    
2946    The main implication of all this is that the datatypes for cells is
2947    split between CellsBasis and CELLS -- a fairly simple change for user
2948    code.
2949    
2950    In the old scheme the CELLS interface had a definitional binding of
2951    the form:
2952    
2953            signature CELLS = sig
2954    
2955               structure CellsBasis = CellsBasis
2956    
2957               ...
2958    
2959            end
2960    
2961    With all the sharing constraints that goes on in MLRISC, this old
2962    design  quickly leads to errors such as:
2963    
2964            "structure definition spec inside of sharing ... "
2965    
2966    
2967    and appears to require an unacceptable amount of sharing and where
2968    constraint hackery.
2969    
2970    I think this error message (the interaction of definitional specs and
2971    sharing) requires more explanation on our web page.
2972    
2973    ----------------------------------------------------------------------
2974    Name: Matthias Blume
2975    Date: 2001/07/19 15:00:00 EDT
2976    Tag: blume-20010719-libreorg
2977    Description:
2978    
2979    This update puts together a fairly extensive but straightforward change
2980    to the way the libraries that implement the interactive system are
2981    organized:
2982    
2983       The biggest change is the elimination of structure Compiler.  As a
2984       replacement for this structure, there is now a CM library
2985       (known as $smlnj/compiler.cm or $smlnj/compiler/current.cm)
2986       that exports all the substructures of the original structure Compiler
2987       directly.  So instead of saying Compiler.Foo.bar one now simply
2988       says Foo.bar.  (The CM libraries actually export a collection of
2989       structures that is richer than the collection of substructures of
2990       structure Compiler.)
2991    
2992       To make the transition smooth, there is a separate library called
2993       $smlnj/compiler/compiler.cm which puts together and exports the
2994       original structure Compiler (or at least something very close to it).
2995    
2996       There are five members of the original structure Compiler
2997       that are not exported directly but which instead became members
2998       of a new structure Backend (described by signature BACKEND).  These are:
2999       structure Profile (: PROFILE), structure Compile (: COMPILE), structure
3000       Interact (: INTERACT), structure Machine (: MACHINE), and val
3001       architecture (: string).
3002    
3003       Structure Compiler.Version has become structure CompilerVersion.
3004    
3005       Cross-compilers for alpha32, hppa, ppc, sparc, and x86 are provided
3006       by $smlnj/compiler/<arch>.cm where <arch> is alpha32, hppa, ppc, sparc,
3007       or x86, respectively.
3008       Each of these exports the same frontend structures that
3009       $smlnj/compiler.cm exports.  But they do not have a structure Backend
3010       and instead export some structure <Arch>Backend where <Arch> is Alpha32,
3011       Hppa, PPC, Sparc, or X86, respectively.
3012    
3013       Library $smlnj/compiler/all.cm exports the union of the exports of
3014       $smlnj/compiler/<arch>.cm
3015    
3016       There are no structures <Arch>Compiler anymore, use
3017       $smlnj/compiler/<arch>.cm instead.
3018    
3019       Library host-compiler-0.cm is gone.  Instead, the internal library
3020       that instantiates CM is now called cm0.cm.  Selection of the host
3021       compiler (backend) is no longer done here but. (Responsibility for it
3022       now lies with $smlnj/compiler/current.cm.  This seems to be more
3023       logical.)
3024    
3025       Many individual files have been moved or renamed.  Some files have
3026       been split into multiple files, and some "dead" files have been deleted.
3027    
3028    Aside from these changes to library organization, there are also changes
3029    to the way the code itself is organized:
3030    
3031       Structure Binfile has been re-implemented in such a way that it no
3032       longer needs any knowledge of the compiler.  It exclusively deals
3033       with the details of binfile layout.  It no longer invokes the
3034       compiler (for the purpose of creating new prospective binfile
3035       content), and it no longer has any knowledge of how to interpret
3036       pickles.
3037    
3038       Structure Compile (: COMPILE) has been stripped down to the bare
3039       essentials of compilation.  It no longer deals with linking/execution.
3040       The interface has been cleaned up considerably.
3041    
3042       Utility routines for dealing with linking and execution have been
3043       moved into their own substructures.
3044    
3045       (The ultimate goal of these changes is to provide a light-weight
3046       binfile loader/linker (at least for, e.g., stable libraries) that
3047       does not require CM or the compiler to be present.)
3048    
3049    CM documentation has been updated to reflect the changes to library
3050    organization.
3051    
3052    ----------------------------------------------------------------------
3053    Name: Matthias Blume
3054    Date: 2001/07/10 17:30:00 EDT
3055    Tag: Release_110_34
3056    Description:
3057    
3058    Minor tweak to 110.34 (re-tagged):
3059    
3060      - README.html file added to CVS repository
3061      - runtime compiles properly under FreeBSD 3.X and 4.X
3062    
3063    ----------------------------------------------------------------------
3064    Name: Matthias Blume
3065    Date: 2001/07/10 17:30:00 EDT
3066    Tag: Release_110_34
3067    Description:
3068    
3069    New version number (110.34). New bootfiles.
3070    
3071    ----------------------------------------------------------------------
3072    Name: Matthias Blume
3073    Date: 2001/07/09 16:00:00 EDT
3074    Tag: blume-20010709-more-varargs
3075    Description:
3076    
3077    I changed the handling of varargs in ml-nlffigen again:
3078    The ellipsis ... will now simply be ignored (with an accompanying warning).
3079    
3080    The immediate effect is that you can actually call a varargs function
3081    from ML -- but you can't actually supply any arguments beyond the ones
3082    specified explicitly.  (For example, you can call printf with its format
3083    string, but you cannot pass additional arguments.)
3084    
3085    This behavior is only marginally more useful than the one before, but
3086    it has the advantage that a function or, more importantly, a function
3087    type never gets dropped on the floor, thus avoiding follow-up problems with
3088    other types that refer to the offending one.
3089    
3090    ----------------------------------------------------------------------
3091    Name: Matthias Blume
3092    Date: 2001/07/09 11:25:00 EDT
3093    Tag: blume-20010709-varargs
3094    Description:
3095    
3096    1. ckit-lib.cm now exports structure Error
3097    2. ml-nlffigen reports occurences of "..." (i.e., varargs function types)
3098       with a warning accompanied by a source location.  Moreover, it
3099       merely skips the offending function or type and proceeds with the
3100       rest of its work.u  As a result, one can safely feed C code containing
3101       "..." to ml-nlffigen.
3102    3. There are some internal improvements to CM, providing slightly
3103       more general string substitutions in the tools subsystem.
3104    
3105    ----------------------------------------------------------------------
3106    Name: Matthias Blume
3107    Date: 2001/06/27 15:10:00 EDT
3108    Tag: blume-20010627-concur
3109    Description:
3110    
3111    Fixed a small bug in CM's handling of parallel compilation.
3112    (You could observe the bug by Control-C-interrupting an ordinary
3113    CMB.make or CM.stabilize and then attaching some compile servers.
3114    The result was that all of a sudden the previously interrupted
3115    compilation would continue on its own.  This was because of
3116    an over-optimization: CM did not bother to clean out certain queues
3117    when no servers were attached "anyway", resulting in the contents
3118    of these queues to grab control when new servers did get attached.)
3119    
3120    There is also another minor update to the CM manual.
3121    
3122    ----------------------------------------------------------------------
3123    Name: Matthias Blume
3124    Date: 2001/06/26 16:15:00 EDT
3125    Tag: blume-20010626-cmdoc
3126    Description:
3127    
3128    Minor typo fixed in CM manual (syntax diagram for libraries).
3129    
3130    ----------------------------------------------------------------------
3131    Name: Matthias Blume
3132    Date: 2001/06/25 22:55:00 EDT
3133    Tag: blume-20010625-x86pc
3134    Description:
3135    
3136    Fixed a nasty bug in the X86 assembly code that caused signal
3137    handlers to fail (crash) randomly.
3138    
3139    ----------------------------------------------------------------------
3140    Name: Matthias Blume
3141    Date: 2001/06/25 12:05:00 EDT
3142    Tag: blume-20010625-nlffigen
3143    Description:
3144    
3145    This update fixes a number of minor bugs in ml-nlffigen as reported by
3146    Nick Carter <nbc@andrew.cmu.edu>.
3147    
3148      1. Silly but ok typedefs of the form "typedef void myvoid;" are now accepted.
3149      2. Default names for generated files are now derived from the name of
3150         the C file *without its directory*.  In particular, this causes generated
3151         files to be placed locally even if the C file is in some system directory.
3152      3. Default names for generated signatures and structures are also derived
3153         from the C file name without its directory.  This avoids silly things
3154         like "structure GL/GL".
3155         (Other silly names are still possible because ml-nlffigen does not do
3156          a thorough check of whether generated names are legal ML identifiers.
3157          When in doubt, use command line arguments to force particular names.)
3158    
3159    ----------------------------------------------------------------------
3160    Name: Matthias Blume
3161    Date: 2001/06/21 12:25:00 EDT
3162    Tag: blume-20010621-eXene
3163    Description:
3164    
3165    eXene now compiles and (sort of) works again.
3166    
3167    The library name (for version > 110.33) is $/eXene.cm.
3168    
3169    I also added an new example in src/eXene/examples/nbody.  See the
3170    README file there for details.
3171    
3172    ----------------------------------------------------------------------
3173    Name: Matthias Blume
3174    Date: 2001/06/20 16:40:00 EDT
3175    Tag: blume-20010620-cml
3176    Description:
3177    
3178    CML now compiles and works again.
3179    
3180    Libraries (for version > 110.33):
3181    
3182      $cml/cml.cm            Main CML library.
3183      $cml/basis.cm          CML's version of $/basis.cm.
3184      $cml/cml-internal.cm   Internal helper library.
3185      $cml/core-cml.cm       Internal helper library.
3186      $cml-lib/trace-cml.cm  Tracing facility.
3187      $cml-lib/smlnj-lib.cm  CML's version of $/smlnj-lib.cm
3188    
3189    The installer (config/install.sh) has been taught how to properly
3190    install this stuff.
3191    
3192    ----------------------------------------------------------------------
3193    Name: Matthias Blume
3194    Date: 2001/06/19 17:55:00 EDT
3195    Tag: blume-20010619-instantiate
3196    Description:
3197    
3198    This un-breaks the fix for bug 1432.
3199    (The bug was originally fixed in 110.9 but I broke it again some
3200    time after that.)
3201    
3202    ----------------------------------------------------------------------
3203    Name: Matthias Blume
3204    Date: 2001/06/19 17:25:00 EDT
3205    Tag: blume-20010619-signals
3206    Description:
3207    
3208    This should (hopefully) fix the long-standing signal handling bug.
3209    (The runtime system was constructing a continuation record with an
3210    incorrect descriptor which would cause the GC to drop data on the floor...)
3211    
3212    ----------------------------------------------------------------------
3213    Name: Matthias Blume
3214    Date: 2001/06/15 15:05:00 EDT
3215    Tag: blume-20010615-moresparc
3216    Description:
3217    
3218    Here is a short late-hour update related to Sparc c-calls:
3219    
3220     -- made handling of double-word arguments a bit smarter
3221    
3222     -- instruction selection phase tries to collapse certain clumsily
3223        constructed ML-Trees; typical example:
3224    
3225            ADD(ty,ADD(_,e,LI d1),LI d2)  ->  ADD(ty,e,LI(d1+d2))
3226    
3227        This currently has no further impact on SML/NJ since mlriscGen does
3228        not seem to generate such patterns in the first place, and c-calls
3229        (which did generate them in the beginning) has meanwhile been fixed
3230        so as to avoid them as well.
3231    
3232    ----------------------------------------------------------------------
3233    Name: Matthias Blume
3234    Date: 2001/06/15 15:05:00 EDT
3235    Tag: blume-20010615-sparc
3236    Description:
3237    
3238    The purpose of this update is to provide an implementation of NLFFI
3239    on Sparc machines.
3240    
3241    Here are the changes in detail:
3242    
3243       * src/MLRISC/sparc/c-calls/sparc-c-calls.sml is a new file containing
3244       the Sparc implementation of the c-calls API.
3245       * The Sparc backend of SML/NJ has been modified to uniformely use %fp
3246       for accessing the ML frame.  Thus, we have a real frame pointer and
3247       can freely modify %sp without need for an omit-frame-ptr phase.
3248       The vfp logic in src/compiler/CodeGen/* has been changed to accomodate
3249       this case.
3250       * ml-nlffigen has been taught to produce code for different architectures
3251       and calling conventions.
3252       * In a way similar to what was done in the x86 case, the Sparc
3253       backend uses its own specific extension to mltree.  (For example,
3254       it needs to be able to generate UNIMP instructions which are part
3255       of the calling convention.)
3256       * ml-nlffi-lib was reorganized to make it more modular (in particular,
3257       to make it easier to plug in new machine- and os-dependent parts).
3258    
3259    There are some other fairly unrelated bug fixes and cleanups as well:
3260    
3261       * I further hacked the .cm files for MLRISC tools (like MDLGen) so
3262       that they properly share their libraries with existing SML/NJ libraries.
3263       * I fixed a minor cosmetic bug in CM, supressing certain spurious
3264       follow-up error messages.
3265       * Updates to CM/CMB documentation.
3266    
3267    TODO items:
3268    
3269       * MLRISC should use a different register as its asmTemp on the Sparc.
3270         (The current %o2 is a really bad choice because it is part of the
3271         calling conventions, so things might interfere in unexpected ways.)
3272    
3273    ----------------------------------------------------------------------
3274    Name: Matthias Blume
3275    Date: 2001/06/07
3276    Tag: blume-20010607-calls
3277    Description:
3278    
3279    A number of internal changes related to C calls and calling conventions:
3280    
3281    1. ML-Tree CALL statements now carry a "pops" field.  It indicates the
3282       number of bytes popped implicitly (by the callee).  In most cases
3283       this field is 0 but on x86/win32 it is some non-zero value.  This
3284       is information provided for the benefit of the "omit-frameptr" pass.
3285    2. The CALL instruction on the x86 carries a similar "pops" field.
3286       The instruction selection phase copies its value from the ML-Tree
3287       CALL statement.
3288    3. On all other architectures, the instruction selection phase checks
3289       whether "pops=0" and complains if not.
3290    4. The c-calls implementation for x86 now accepts two calling conventions:
3291       "ccall" and "stdcall".  When "ccall" is selected, the caller cleans
3292       up after the call and pops is set to 0.  For "stdcall", the caller
3293       does nothing, leaving the cleanup to the callee; pops is set to
3294       the number of bytes that were pushed onto the stack.
3295    5. The cproto decoder (compiler/Semant/types/cproto.sml) now can
3296       distinguish between "ccall" and "stdcall".
3297    6. The UNIMP instruction has been added to the supported Sparc instruction
3298       set. (This is needed for implementing the official C calling convention
3299       on this architecture.)
3300    7. I fixed some of the .cm files under src/MLRISC/Tools to make them
3301       work with the latest CM.
3302    
3303    ----------------------------------------------------------------------
3304    Name: Matthias Blume
3305    Date: 2001/06/05 15:10:00 EDT
3306    Tag: blume-20010605-cm-index
3307    Description:
3308    
3309    0. The "lambdasplit" parameter for class "sml" in CM has been documented.
3310    
3311    1. CM can now generate "index files".  These are human-readable files
3312       that list on a per-.cm-file basis each toplevel symbol defined or
3313       imported.  The location of the index file for
3314       <p>/<d>.cm is <p>/CM/INDEX/<d>.cm.
3315       To enable index-file generation, set CM.Control.generate_index to true
3316       or export an environment-symbol: export CM_GENERATE_INDEX=true.
3317    
3318       The CM manual has been updated accordingly.
3319    
3320    2. I made some slight modifications to the c-calls API in MLRISC.
3321    
3322         a) There is now a callback to support saving/restoring of
3323            dedicated but caller-save registers around the actual call
3324            instruction.
3325         b) One can optionally specify a comment-annotation for the
3326            call instruction.
3327    
3328    3. SML/NJ (mlriscGen.sml) uses this new API for the rawccall primop.
3329       (For example, the comment annotation shows the C prototype of
3330        the function being called.)
3331    
3332    ----------------------------------------------------------------------
3333    Name: Matthias Blume
3334    Date: 2001/06/01 13:30:00 EDT
3335    Tag: blume-20010601-nlffi-cleanup
3336    Description:
3337    
3338    This is mostly a cleanup of MLFFI stuff:
3339    
3340       - some signature files have been put into a more exposed place
3341       - the ugly 'f type parameter is gone (simplifies types tremendously!)
3342       - ml-nlffigen changed accordingly
3343       - tutorial updated
3344    
3345    Other changes:
3346    
3347       - author's affiliation in CM manual(s) updated
3348       - some more recognized keywords added to Allen's sml.sty
3349    
3350    ----------------------------------------------------------------------
3351    Name: Matthias Blume
3352    Date: 2001/05/25 15:30:00 EDT
3353    Tag: blume-20010525-iptr
3354    Description:
3355    
3356      - put the official 110.33-README (as it appears on the ftp server) under
3357        CVS
3358      - fixed a small bug related to incomplete pointer types in
3359        ml-nlffigen
3360      - small cosmetic change to the ml-nlffi-lib's "arr" type constructor
3361        (it does not need the 'f type parameter)
3362    
3363    ----------------------------------------------------------------------
3364    Name: Matthias Blume
3365    Date: 2001/05/23 14:30:00 EDT
3366    Tag: Release_110_33
3367    Description:
3368    
3369    New version number (110.33).  New bootfiles.
3370    
3371    ----------------------------------------------------------------------
3372    Name: Matthias Blume
3373    Date: 2001/05/22 18:06:00 EDT
3374    Tag: blume-20010522-targets
3375    Description:
3376    
3377    Made install.sh use file config/targets.customized if it exists, falling
3378    back to config/targets if it doesn't.  This way one can have a customized
3379    version of the targets file without touching the "real thing", thus
3380    eliminating the constant fear of accidentally checking something bogus
3381    back into the CVS repository...  (File config/targets.customized must
3382    not be added to the repository!)
3383    
3384    ----------------------------------------------------------------------
3385    Name: Matthias Blume
3386    Date: 2001/05/22 16:30:00 EDT
3387    Tag: blume-20010522-minitut
3388    Description:
3389    
3390    1. Bug fix in ml-nlffigen; now (hopefully) correctly handling
3391       struct returns.
3392    2. Added src/ml-nlffi-lib/Doc/mini-tutorial.txt.  This is some very
3393       incomplete, preliminary documentation for NLFFI.
3394    
3395    ----------------------------------------------------------------------
3396    Name: Matthias Blume
3397    Date: 2001/05/14 11:30:00 EDT
3398    Tag: blume-20010514-script
3399    Description:
3400    
3401    Some bugs in install script fixed.
3402    
3403    In addition to that I also made a slight change to the NLFFI API:
3404    Functors generated by ml-nlffigen now take the dynamic library as a
3405    straight functor argument, not as a suspended one.  (The original
3406    functor code used to force the suspension right away anyway, so there
3407    was nothing gained by this complication of the interface.)
3408    
3409    ----------------------------------------------------------------------
3410    Name: Matthias Blume
3411    Date: 2001/05/11 14:35:00 EDT
3412    Tag: blume-20010511-ml-nlffi
3413    Description:
3414    
3415    I finally took the plunge and added my new FFI code to the main
3416    repository.  For x86-linux it is now ready for prime-time.
3417    
3418    There are two new subdirectories of "src":
3419    
3420      - ml-nlffi-lib:
3421           The utility library for programs using the FFI interface.
3422           Here is the implementation of $/c.cm and its associated low-level
3423           partners $/c-int.cm and $/memory.cm.
3424      - ml-nlffigen:
3425           A stand-alone program for generating ML glue code from C source
3426           code.
3427    
3428    Building ml-nlffigen requires $/ckit-lib.cm.
3429    
3430    The config/install.sh script has been updates to do the Right Thing
3431    (hopefully).
3432    
3433    Notice that the source tree for the C-Kit will not be put under "src"
3434    but directly under the installation root directory.  (This is the
3435    structure that currently exists on the CVS server when you check out
3436    module "sml".)  Fortunately, config/install.sh knows about this oddity.
3437    
3438    Bugs: No documentation yet.
3439    
3440    ----------------------------------------------------------------------
3441    Name: Matthias Blume
3442    Date: 2001/05/09 16:35:00 EDT
3443    Tag: blume-20010509-cpscontract
3444    Description:
3445    
3446    Fixed a bug in the accounting code in cpsopt/contract.sml.  (The
3447    wrapper/unwrapper elimination did not decrement usage counts and some
3448    dead variables got overlooked by the dead-up logic.)
3449    
3450    ----------------------------------------------------------------------
3451    Name: Lal George
3452    Date: 2001/05/08  17:26:09 EDT
3453    Tag: george-20010508-omit-frameptr
3454    Description:
3455    
3456    Changes to implement the omit-frame-pointer optimization to support
3457    raw C calls. For now, there is only support on the Intel x86, but
3458    other architectures will follow as more experience is gained with this.
3459    
3460    
3461    ----------------------------------------------------------------------
3462    Name: Matthias Blume
3463    Date: 2001/05/07 14:40:00 EDT
3464    Tag: blume-20010507-proxies
3465    Description:
3466    
3467    I made into "proxy libraries" all libraries that qualify for such a
3468    change.  (A qualifying library is a library that has another library or
3469    groups as its sole member and repeats that member's export list
3470    verbatim.  A proxy library avoids this repetition by omitting its export
3471    list, effectively inheriting the list that its (only) member exports.
3472    See the CM manual for more explanation.)
3473    The main effect is that explicit export lists for these libraries
3474    do not have to be kepts in sync, making maintenance a bit easier.
3475    
3476    I also added copyright notices to many .cm-files.
3477    
3478    Last but not least, I made a new set of bootfiles.
3479    
3480    ----------------------------------------------------------------------
3481    Name: Matthias Blume
3482    Date: 2001/05/04 17:00:00 EDT
3483    Tag: blume-20010504-cm-lsplit
3484    Description:
3485    
3486    0. John merged pending changes to $/smlnj-lib.cm
3487    
3488    1. Allen's previous change accidentally backed out of one of Lal's
3489       earlier changes.  I undid this mistake (re-introducing Lal's change).
3490    
3491    2. I used the new topOrder' function from graph-scc.sml (from $/smlnj-lib.cm)
3492       within the compiler where applicable.  There is some code simplification
3493       because of that.
3494    
3495    3. The "split" phase (in FLINT) is now part of the default list of phases.
3496       Compiler.Control.LambdaSplitting.* can be used to globally control the
3497       lambda-splitting (cross-module-inlining) engine.  In addition to that,
3498       it can now also be controlled on a per-source basis: CM has been taught
3499       a new tool parameter applicable to ML source files.
3500    
3501       - To turn lambda-splitting off completely:
3502            local open Compiler.Control.LambdaSplitting in
3503                val _ = set Off
3504            end
3505       - To make "no lambda-splitting" the global default (but allow per-source
3506         overriding); this is the initial setting:
3507            local open Compiler.Control.LambdaSplitting in
3508                val _ = set (Default NONE)
3509            end
3510       - To make "lambda-splitting with aggressiveness a" the global default
3511         (and allow per-source overriding):
3512            local open Compiler.Control.LambdaSplitting in
3513                val _ = set (Default (SOME a))
3514            end
3515    
3516       - To turn lambda-splitting off for a given ML souce file (say: a.sml)
3517         write (in the respective .cm-file):
3518            a.sml (lambdasplitting:off)
3519       - To turn lambda-splitting for a.sml on with minimal aggressiveness:
3520            a.sml (lambdasplitting:on)
3521       - To turn lambda-splitting for a.sml on with aggressiveness <a> (where
3522         <a> is a decimal non-negative integer):
3523            a.sml (lambdasplitting:<a>)
3524       - To turn lambda-splitting for a.sml on with maximal aggressiveness:
3525            a.sml (lambdasplitting:infinity)
3526       - To use the global default for a.sml:
3527            a.sml (lambdasplitting:default)
3528         or simply
3529            a.sml
3530    
3531    ----------------------------------------------------------------------
3532    Name: Allen Leung
3533    Date: 2001/05/04 01:57:00 EDT
3534    Tag: leunga-20010504-sync
3535    Description:
3536    
3537      MLRISC features.
3538    
3539      1. Fix to CMPXCHG instructions.
3540      2. Changed RA interface to allow annotations in callbacks.
3541      3. Added a new method to the stream interface to allow annotations updates.
3542    
3543    ----------------------------------------------------------------------
3544    Name: Matthias Blume
3545    Date: 2001/05/01 11:45:00 EDT
3546    Tag: blume-20010501-pcedittmp
3547    Description:
3548    
3549    Changed install.sh to use the current working directory instead of
3550    /usr/tmp for a temporary file (pcedittmp).  The previous choice
3551    of /usr/tmp caused trouble with MacOS X because of file premission
3552    problems.
3553    
3554    ----------------------------------------------------------------------
3555    Name: Matthias Blume
3556    Date: 2001/04/20 11:10:00 EDT
3557    Tag: blume-20010420-inMLflag
3558    Description:
3559    
3560     - added vp_limitPtrMask to vproc-state.h
3561       (for use by the raw-C-calls mechanism to implement proper interrupt
3562        handling)
3563     - made the ML compiler aware of various data-structure offsets so it
3564       can generate code for accessing the vp_inML flag and vp_limitPtrMask
3565     - tweaked mlriscGen.sml to have it emit interrupt-handling code for
3566       raw C-calls
3567    
3568    ----------------------------------------------------------------------
3569    Name: Lal George
3570    Date: 2001/04/20 09:15:28 EDT
3571    Tag: george-20010420-macosX
3572    Description:
3573    
3574     - Changes to port to Mac OS X; Darwin.
3575    
3576     - In the process I found that sqrt was broken on the PPC, because the
3577       fsqrt instruction is not implemented.
3578    
3579    ----------------------------------------------------------------------
3580    Name: Matthias Blume
3581    Date: 2001/04/18 12:45:00 EDT
3582    Tag: blume-20010418-ccalls
3583    Description:
3584    
3585     - fixed two off-by-4 errors in the x86-specific c-calls implementation
3586       (this bug prevented structure arguments containing pointers from being
3587        passed correctly)
3588     - changed the raw-C-call code in mlriscGen.sml in such a way that
3589       structure arguments are represented as a pointer to the beginning
3590       of the structure (instead of having a series of synthesized arguments,
3591       one for each structure member)
3592    
3593     - made makeml script's verbosity level configurable via environment
3594       variable (MAKEML_VERBOSITY)
3595    
3596     - eliminated placeholder implementations for f32l, w16s, i16s, and f32s
3597       in rawmem-x86.sml; we are now using the real thing
3598    
3599    ----------------------------------------------------------------------
3600    Name: Matthias Blume
3601    Date: 2001/03/22 16:25:00 EST
3602    Tag: blume-20010322-bootfiles
3603    Description:
3604    
3605    Created a new set of bootfiles (for your automatic installation convenience).
3606    
3607    ----------------------------------------------------------------------
3608    Name: Matthias Blume
3609