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Diff of /sml/trunk/HISTORY

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revision 1133, Tue Mar 12 03:56:23 2002 UTC revision 1291, Sat Dec 7 03:41:00 2002 UTC
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13  Description:  Description:
14    
15  ----------------------------------------------------------------------  ----------------------------------------------------------------------
16    Name: Matthias Blume
17    Date: 2002/12/06 22:40:00 EST
18    Tag: blume-20021206-cm-fileid
19    Description:
20    
21    Added a call of SrcPath.sync at the beginning of Parse.parse (in CM).
22    This fixes the problem of CM getting confused by files that suddenly
23    change their identity (e.g., by getting unlinked and recreated by some
24    text editor such as vi).  There might be a better/cheaper/cleaner way
25    of doing this, but for now this will have to do.
26    
27    ----------------------------------------------------------------------
28    Name: Matthias Blume
29    Date: 2002/10/28 09:50:00 EST
30    Tag: blume-20021028-typecheck
31    Description:
32    
33    Exported structure Typecheck from $smlnj/viscomp/core.cm.
34    
35    ----------------------------------------------------------------------
36    Name: Matthias Blume
37    Date: 2002/10/17 09:10:00 EDT
38    Tag: Release_110_42
39    Description:
40    
41    In good old tradition, there has been a slight hiccup so that we have
42    to patch 110.42 after the fact.   The old release tag has been replaced
43    (see below).
44    
45    The change solves a problem with two competing approaches the
46    configuration problem regarding MacOS 10.1 vs. MacOS 10.2 which got in
47    each other's way.
48    
49    This change only affects the runtime system code and the installer script.
50    (No new bootfiles.)
51    
52    ----------------------------------------------------------------------
53    Name: Matthias Blume
54    Date: 2002/10/16 12:00:00 EDT
55    Tag: Release_110_42_removed
56    Description:
57    
58    New working release.  New bootfiles.
59    
60    ----------------------------------------------------------------------
61    Name: Matthias Blume
62    Date: 2002/10/10 13:10:00 EDT
63    Tag: blume-20021010-ppc-divs
64    Description:
65    
66    The mltree operator DIVS must be implemented with an overflow check on
67    the PPC because the hardware indicates divide-by-zero using "overflow" as
68    well.
69    
70    ----------------------------------------------------------------------
71    Name: Matthias Blume
72    Date: 2002/07/23 11:45:00
73    Tag: blume-20020723-smlnj-home
74    Description:
75    
76    Sml now senses the SMLNJ_HOME environment variable.  If this is set,
77    then the bin dir is assumed to be in $SMLNJ_HOME/bin and (unless
78    CM_PATHCONFIG is also set), the path configuration file is assumed
79    to be in $SMLNJ_HOME/lib/pathconfig.  This way one can easily move
80    the entire tree to some other place and everything will "just work".
81    
82    (Companion commands such as ml-build and ml-makedepend also sense this
83    variable.)
84    
85    ----------------------------------------------------------------------
86    Name: Matthias Blume
87    Date: 2002/07/12 21:19:00 EDT
88    Tag: blume-20020712-liveness
89    Description:
90    
91    Exported two useful "step" functions from liveness module (MLRISC).
92    
93    ----------------------------------------------------------------------
94    Name: Matthias Blume
95    Date: 2002/07/05 16:00 EDT
96    Tag: Release_110_41
97    Description:
98    
99    New working release.  New bootfiles.
100    
101    ----------------------------------------------------------------------
102    Name: Matthias Blume
103    Date: 2002/07/05 10:25:00 EDT
104    Tag: blume-20020705-btimp
105    Description:
106    
107    Exported structure BTImp from $smlnj/viscomp/debugprof.cm so that
108    other clients can set up backtracing support.
109    
110    ----------------------------------------------------------------------
111    Name: Matthias Blume
112    Date: 2002/06/25 17:23:00 EDT
113    Tag: blume-20020625-fpmax
114    Description:
115    
116    Fixed a bug in translation of INLMAX (and INLMIN) for the floating-point
117    case.  (The sense of the isNaN test was reversed -- which made min and
118    max always return their first argument.)
119    
120    ----------------------------------------------------------------------
121    Name: Matthias Blume
122    Date: 2002/06/11
123    Tag: blume-20020611-unixpath
124    Description:
125    
126    Back-ported OS.Path.{from,to}UnixPath from idlbasis-devel branch.
127    
128    ----------------------------------------------------------------------
129    Name: Matthias Blume
130    Date: 2002/06/10 16:35:00 EDT
131    Tag: blume-20020610-ieeereal
132    Description:
133    
134    I back-ported my implementation of IEEEReal.fromString from the
135    idlbasis-devel branch so that we can test it.
136    
137    Another small change is that ppDec tries to give more information
138    than just "<sig>" in the case of functors.  However, this code is
139    broken in some mysterious way if the functor's body's signature
140    has not been declared by ascription but gets inferred from the
141    implementation.  This needs fixing...
142    
143    ----------------------------------------------------------------------
144    Name: Matthias Blume
145    Date: 2002/05/31
146    Tag: blume-20020531-btrace-mode
147    Description:
148    
149    Resurrected SMLofNJ.Internals.BTrace.mode.  (It accidentally fell by
150    the wayside when I switched over to using Controls everywhere.)
151    
152    ----------------------------------------------------------------------
153    Name: Lal George
154    Date: 2002/05/23 12:21:40 EDT
155    Tag: george-20020523-visual-labels
156    Description:
157    
158    Labels are now displayed in the graphical output to make
159    the fall-through and target blocks obvious.
160    
161    ----------------------------------------------------------------------
162    Name: Matthias Blume
163    Date: 2002/05/22 11:03:00 EDT
164    Tag: blume-20020522-shrink
165    Description:
166    
167    John tweaked yesterday's fix for 1131 to handle an out-of-memory
168    situation that comes up when allocating huge arrays.
169    
170    ----------------------------------------------------------------------
171    Name: Matthias Blume
172    Date: 2002/05/21 16:00:00 EDT
173    Tag: Release_110_40
174    Description:
175    
176    New working release (110.40).  New bootfiles.
177    
178    [Also: John Reppy fixed GC bug 1131.]
179    
180    ----------------------------------------------------------------------
181    Name: Matthias Blume
182    Date: 2002/05/21 12:35:00 EDT
183    Tag: blume-20020521-cmdoc
184    Description:
185    
186    CM documentation update.
187    
188    ----------------------------------------------------------------------
189    Name: Matthias Blume
190    Date: 2002/05/21 10:55:00 EDT
191    Tag: blume-20020521-misc
192    Description:
193    
194    - John tweaked runtime to be silent on heap export (except when
195      GC messages are on).
196    - I added a few more things (cross-compiling versions of CMB) to
197      config/preloads (as suggestions).
198    
199    ----------------------------------------------------------------------
200    Name: Matthias Blume
201    Date: 2002/05/20 22:25:00 EDT
202    Tag: blume-20020520-controls
203    Description:
204    
205    - Added ControlUtil structure to control-lib.cm.
206    - Use it throughout.
207    - Used Controls facility to define MLRISC controls (as opposed to
208      registering MLRISC control ref cells with Controls after the fact)
209    - Fixed messed-up controls priorities.
210    
211    * Removed again all the stuff from config/preloads that one wouldn't
212      be able to preload at the time the initial heap image is built.
213      (Many libraries, e.g., CML, do not exist yet at this time.  The
214       only libraries that can be preloaded via config/preloads are those
215       that come bundled with the bootfiles.)
216    
217    ----------------------------------------------------------------------
218    Name: Matthias Blume
219    Date: 2002/05/20 10:59:00 EDT
220    Tag: blume-20020520-preloads
221    Description:
222    
223    Added a lot of commented-out suggestions for things to be included
224    in config/preloads.
225    
226    ----------------------------------------------------------------------
227    Name: Allen Leung
228    Date: 2002/05/18 14:20:00 EDT
229    Tag: leunga-20020518-mdl
230    Description:
231    
232    o Made the mdl tool stuff compile and run again.
233    o I've disabled all the stuff that depends on RTL specifications; they
234      are all badly broken anyway.
235    
236    ----------------------------------------------------------------------
237    Name: Matthias Blume
238    Date: 2002/05/17 16:49:00 EDT
239    Tag: blume-20020517-controls
240    Description:
241    
242    0. John Reppy made several modifications to the SML/NJ library.
243       In particular, there is a shiny new controls-lib.cm.
244    
245    1. Pushed new controls interface through compiler so that everything
246       compiles again.
247    
248    2. Added FormatComb and FORMAT_COMB to the CML version of the
249       SML/NJ library (so that CML compiles again).
250    
251    3. Modified init scripts because XXX_DEFAULT environment variables
252       are no longer with us.  (Boot-time initialization is now done
253       using the same environment variables that are also used for
254       startup-time initialization of controls.)
255    
256    ----------------------------------------------------------------------
257    Name: Lal George
258    Date: 2002/05/15 09:20:10 EDT
259    Tag: george-20020515-pseudo-op-decls
260    Description:
261    
262            All pseudo-ops emitted before the first segment declaration
263    such as TEXT, DATA, and BSS directives are assumed to be global
264    declarations and are emitted first in the assembly file. This is
265    useful in a number of situations where one has pseudo-ops that are not
266    specific to any segment, and also works around the constraint that one
267    cannot have client pseudo-ops in the TEXT segment.
268    
269            Because no segment is associated with these declarations it is
270    an error to allocate any space or objects before the first segment
271    directive and an exception will be raised. However, we cannot make
272    this check for client pseudo-ops.
273    
274            These top level declarations are a field in the CFG graph_info.
275    In theory you can continue to add to this field after the CFG has been
276    built -- provided you know what you are doing;-)
277    
278    ----------------------------------------------------------------------
279    Name: Matthias Blume
280    Date: 2002/05/13 16:40:00 EDT
281    Tag: blume-20020513-pp-etc
282    Description:
283    
284    A few minor bugfixes:
285    
286      - Stopgap measure for bug recently reported by Elsa Gunter (ppDec).
287        (Bogus printouts for redefined bindings still occur.  Compiler
288        bug should no longer occur now.  We need to redo the prettyprinter
289        from scratch.)
290    
291      - CM pathname printer now also adds escape sequences for ( and )
292    
293      - commend and docu fixes for ml-nlffi
294    
295    ----------------------------------------------------------------------
296    Name: Matthias Blume
297    Date: 2002/05/10 16:40:00 EDT
298    Tag: blume-20020510-erg-textio
299    Description:
300    
301    Applied the following bugfix provided by Emden Gansner:
302    
303        Output is corrupted when outputSubstr is used rather than output.
304    
305        The problem occurs when a substring
306    
307            ss = (s, dataStart, dataLen)
308    
309        where dataStart > 0, fills a stream buffer with avail bytes left.
310        avail bytes of s, starting at index dataStart, are copied into the
311        buffer, the buffer is flushed, and then the remaining dataLen-avail
312        bytes of ss are copied into the beginning of the buffer. Instead of
313        starting this copy at index dataStart+avail in s, the current code
314        starts the copy at index avail.
315    
316        Fix:
317        In text-io-fn.sml, change line 695 from
318             val needsFlush = copyVec(v, avail, dataLen-avail, buf, 0)
319        to
320             val needsFlush = copyVec(v, dataStart+avail, dataLen-avail, buf, 0)
321    
322    ----------------------------------------------------------------------
323    Name: Matthias Blume
324    Date: 2002/04/12 13:55:00 EDT
325    Tag: blume-20020412-assyntax
326    Description:
327    
328    1. Grabbed newer assyntax.h from the XFree86 project.
329    2. Fiddled with how to compile X86.prim.asm without warnings.
330    3. (Very) Minor cleanup in CM.
331    
332    ----------------------------------------------------------------------
333    Name: Matthias Blume
334    Date: 2002/04/01 (no joke!) 17:07:00 EST
335    Tag: blume-20020401-x86div
336    Description:
337    
338    Added full support for div/mod/rem/quot on the x86, using the machine
339    instruction's two results (without clumsily recomputing the remainder)
340    directly where appropriate.
341    
342    Some more extensive power-of-two support was added to the x86 instruction
343    selector (avoiding expensive divs, mods, and muls where they can be
344    replaced with cheaper shifts and masks).  However, this sort of thing
345    ought to be done earlier, e.g., within the CPS optimizer so that
346    all architectures benefit from it.
347    
348    The compiler compiles to a fixed point, but changes might be somewhat
349    fragile nevertheless.  Please, report any strange things that you might
350    see wrt. div/mod/quot/rem...
351    
352    ----------------------------------------------------------------------
353    Name: Matthias Blume
354    Date: 2002/03/29 17:22:00
355    Tag: blume-20020329-div
356    Description:
357    
358    Fixed my broken div/mod logic.  Unfortunately, this means that the
359    inline code for div/mod now has one more comparison than before.
360    Fast paths (quotient > 0 or remainder = 0) are not affected, though.
361    The problem was with quotient = 0, because that alone does not tell
362    us which way the rounding went.  One then has to look at whether
363    remainder and divisor have the same sign...  :(
364    
365    Anyway, I replaced the bootfiles with fresh ones...
366    
367    ----------------------------------------------------------------------
368    Name: Matthias Blume
369    Date: 2002/03/29 14:10:00 EST
370    Tag: blume-20020329-inlprims
371    Description:
372    
373    NEW BOOTFILES!!!    Version number bumped to 110.39.3.
374    
375    Primops have changed. This means that the bin/boot-file formats have
376    changed as well.
377    
378    To make sure that there is no confusion, I made a new version.
379    
380    
381    CHANGES:
382    
383    * removed REMT from mltree (remainder should never overflow).
384    
385    * added primops to deal with divisions of all flavors to the frontend
386    
387    * handled these primops all the way through so they map to their respective
388      MLRISC support
389    
390    * used these primops in the implementation of Int, Int32, Word, Word32
391    
392    * removed INLDIV, INLMOD, and INLREM as they are no longer necessary
393    
394    * parameterized INLMIN, INLMAX, and INLABS by a numkind
395    
396    * translate.sml now deals with all flavors of INL{MIN,MAX,ABS}, including
397      floating point
398    
399    * used INL{MIN,MAX,ABS} in the implementation of Int, Int32, Word, Word32,
400      and Real (but Real.abs maps to a separate floating-point-only primop)
401    
402    
403    TODO items:
404    
405    * Hacked Alpha32 instruction selection, disabling the selection of REMx
406      instructions because the machine instruction encoder cannot handle
407      them.  (Hppa, PPC, and Sparc instruction selection did not handle
408      REM in the first place, and REM is supported by the x86 machine coder.)
409    
410    * Handle DIV and MOD with DIV_TO_NEGINF directly in the x86 instruction
411      selection phase.  (The two can be streamlined because the hardware
412      delivers both quotient and remainder at the same time anyway.)
413    
414    * Think about what to do with "valOf(Int32.minInt) div ~1" and friends.
415      (Currently the behavior is inconsistent both across architectures and
416      wrt. the draft Basis spec.)
417    
418    * Word8 should eventually be handled natively, too.
419    
420    * There seems to be one serious bug in mltree-gen.sml.  It appears, though,
421      as if there currently is no execution path that could trigger it in
422      SML/NJ.  (The assumptions underlying functions arith and promotable do not
423      hold for things like multiplication and division.)
424    
425    ----------------------------------------------------------------------
426    Name: Matthias Blume
427    Date: 2002/03/27 16:27:00 EST
428    Tag: blume-20020327-mlrisc-divisions
429    Description:
430    
431    Added support for all four division operations (ML's div, mod, quot,
432    and rem) to MLRISC.  In the course of doing so, I also rationalized
433    the naming (no more annoying switch-around of DIV and QUOT), by
434    parameterizing the operation by div_rounding_mode (which can be either
435    DIV_TO_ZERO or DIV_TO_NEGINF).
436    
437    The generic MLTreeGen functor takes care of compiling all four
438    operations down to only round-to-zero div.
439    
440    Missing pieces:
441    
442      * Doing something smarter than relying on MLTreeGen on architectures
443        like, e.g., the x86 where hardware division delivers both quotient and
444        remainder at the same time.  With this, the implementation of the
445        round-to-neginf operations could be further streamlined.
446    
447      * Remove inlining support for div/mod/rem from the frontend and replace it
448        with primops that get carried through to the backend.  Do this for all
449        int and word types.
450    
451    ----------------------------------------------------------------------
452    Name: Matthias Blume
453    Date: 2002/03/25 17:25:00 EST
454    Tag: blume-20020325-divmod
455    Description:
456    
457    I improved (hopefully without breaking them) the implementation of Int.div,
458    Int.mod, and Int.rem.   For this, the code in translate.sml now takes
459    advantage of the following observations:
460    
461      Let  q = x quot y      r = x rem y
462           d = x div  y      m = x mod y
463    
464    where "quot" is the round-to-zero version of integer division that
465    hardware usually provides.  Then we have:
466    
467         r = x - q * y        where neither the * nor the - will overflow
468         d = if q >= 0 orelse x = q * y then q else q - 1
469                              where neither the * nor the - will overflow
470         m = if q >= 0 orelse r = 0 then r else r + y
471                              where the + will not overflow
472    
473    This results in substantial simplification of the generated code.
474    The following table shows the number of CFG nodes and edges generated
475    for
476            fun f (x, y) = x OPER y
477            (* with OPER \in div, mod, quot, rem *)
478    
479    
480        OPER | nodes(old) | edges(old) | nodes(new) | edges(new)
481        --------------------------------------------------------
482         div |         24 |         39 |         12 |         16
483         mod |         41 |         71 |         12 |         16
484        quot |          8 |         10 |          8 |         10
485         rem |         10 |         14 |          8 |         10
486    
487    
488    ----------------------------------------------------------------------
489    Name: Matthias Blume
490    Date: 2002/03/25 22:06:00 EST
491    Tag: blume-20020325-cprotobug
492    Description:
493    
494    Fixed a bug in cproto (c prototype decoder).
495    
496    ----------------------------------------------------------------------
497    Name: Matthias Blume
498    Date: 2002/03/25 16:00:00 EST
499    Tag: blume-20020325-raw-primops
500    Description:
501    
502    I did some cleanup to Allen's new primop code and
503    replaced yesterday's bootfiles with new ones.
504    (But they are stored in the same place.)
505    
506    ----------------------------------------------------------------------
507    Name: Matthias Blume
508    Date: 2002/03/24 22:40:00 EST
509    Tag: blume-20020324-bootfiles
510    Description:
511    
512    Made the bootfiles that Allen asked for.
513    
514    ----------------------------------------------------------------------
515    Name: Allen Leung
516    Date: 2002/03/23 15:50:00 EST
517    Tag: leunga-20020323-flint-cps-rcc-primops
518    Description:
519    
520      1. Changes to FLINT primops:
521    
522        (* make a call to a C-function;
523         * The primop carries C function prototype information and specifies
524         * which of its (ML-) arguments are floating point. C prototype
525         * information is for use by the backend, ML information is for
526         * use by the CPS converter. *)
527      | RAW_CCALL of { c_proto: CTypes.c_proto,
528                       ml_args: ccall_type list,
529                       ml_res_opt: ccall_type option,
530                       reentrant : bool
531                     } option
532       (* Allocate uninitialized storage on the heap.
533        * The record is meant to hold short-lived C objects, i.e., they
534        * are not ML pointers.  With the tag, the representation is
535        * the same as RECORD with tag tag_raw32 (sz=4), or tag_fblock (sz=8)
536        *)
537      | RAW_RECORD of {tag:bool,sz:int}
538      and ccall_type = CCALL_INT32 | CCALL_REAL64 | CCALL_ML_PTR
539    
540      2.  These CPS primops are now overloaded:
541    
542           rawload of {kind:numkind}
543           rawstore of {kind:numkind}
544    
545          The one argument form is:
546    
547             rawload {kind} address
548    
549          The two argument form is:
550    
551             rawload {kind} [ml object, byte-offset]
552    
553      3. RAW_CCALL/RCC now takes two extra arguments:
554    
555         a. The first is whether the C call is reentrant, i.e., whether
556            ML state should be saved and restored.
557         b. The second argument is a string argument specifying the name of
558            library and the C function.
559    
560         These things are currently not handled in the code generator, yet.
561    
562      4. In CProto,
563    
564         An encoding type of "bool" means "ml object" and is mapped into
565         C prototype of PTR.  Note that "bool" is different than "string",
566         even though "string" is also mapped into PTR, because "bool"
567         is assigned an CPS type of BOGt, while "string" is assigned INT32t.
568    
569      5. Pickler/unpicker
570    
571         Changed to handle RAW_RECORD and newest RAW_CCALL
572    
573      6. MLRiscGen,
574    
575         1. Changed to handle the new rawload/rawstore/rawrecord operators.
576         2. Code for handling C Calls has been moved to a new module CPSCCalls,
577            in the file CodeGen/cpscompile/cps-c-calls.sml
578    
579      7. Added the conditional move operator
580    
581             condmove of branch
582    
583         to cps.  Generation of this is still buggy so it is currently
584         disabled.
585    
586    ----------------------------------------------------------------------
587    Name: Lal George
588    Date: 2002/03/22 14:18:25 EST
589    Tag: george-20020322-cps-branch-prob
590    Description:
591    
592    Implemented the Ball-Larus branch prediction-heuristics, and
593    incorporated graphical viewers for control flow graphs.
594    
595    Ball-Larus Heuristics:
596    ---------------------
597    See the file compiler/CodeGen/cpscompile/cpsBranchProb.sml.
598    
599    By design it uses the Dempster-Shafer theory for combining
600    probabilities.  For example, in the function:
601    
602        fun f(n,acc) = if n = 0 then acc else f(n-1, n*acc)
603    
604    the ball-larus heuristics predicts that the n=0 is unlikely
605    (OH-heuristic), and the 'then' branch is unlikely because of the
606    RH-heuristic -- giving the 'then' branch an even lower combined
607    probability using the Dempster-Shafer theory.
608    
609    Finally, John Reppy's loop analysis in MLRISC, further lowers the
610    probability of the 'then' branch because of the loop in the else
611    branch.
612    
613    
614    Graphical Viewing:
615    ------------------
616    I merely plugged in Allen's graphical viewers into the compiler. The
617    additional code is not much. At the top level, saying:
618    
619            Control.MLRISC.getFlag "cfg-graphical-view" := true;
620    
621    will display the graphical view of the control flow graph just before
622    back-patching.  daVinci must be in your path for this to work. If
623    daVinci is not available, then the default viewer can be changed
624    using:
625    
626            Control.MLRISC.getString "viewer"
627    
628    which can be set to "dot" or "vcg" for the corresponding viewers. Of
629    course, these viewers must be in your path.
630    
631    The above will display the compilation unit at the level of clusters,
632    many of which are small, boring, and un-interesting. Also setting:
633    
634            Control.MLRISC.getInt "cfg-graphical-view_size"
635    
636    will display clusters that are larger than the value set by the above.
637    
638    
639    ----------------------------------------------------------------------
640    Name: Matthias Blume
641    Date: 2002/03/21 22:20:00 EST
642    Tag: blume-20020321-kmp-bugfix
643    Description:
644    
645    Changed the interface to the KMP routine in PreString and fixed
646    a minor bug in one place where it was used.
647    
648    ----------------------------------------------------------------------
649    Name: Allen Leung
650    Date: 2002/03/21 20:30:00 EST
651    Tag: leunga-20020321-cfg
652    Description:
653    
654      Fixed a potential problem in cfg edge splitting.
655    
656    ----------------------------------------------------------------------
657    Name: Allen Leung
658    Date: 2002/03/21 17:15:00 EST
659    Tag: leunga-20020321-x86-fp-cfg
660    Description:
661    
662      1. Recoded the buggy parts of x86-fp.
663    
664         a. All the block reordering code has been removed.
665            We now depend on the block placement phases to do this work.
666    
667         b. Critical edge splitting code has been simplified and moved into the
668            CFG modules, as where they belong.
669    
670         Both of these were quite buggy and complex.  The code is now much, much
671         simpler.
672    
673      2. X86 backend.
674    
675         a. Added instructions for 64-bit support.  Instruction selection for
676            64-bit has not been committed, however, since that
677            requires changes to MLTREE which haven't been approved by
678            Lal and John.
679    
680         b. Added support for FUCOMI and FUCOMIP when generating code for
681            PentiumPro and above.  We only generate these instructions in
682            the fast-fp mode.
683    
684         c. Added cases for JP and JNP in X86FreqProps.
685    
686      3. CFG
687    
688         CFG now has a bunch of methods for edge splitting and merging.
689    
690      4. Machine description.
691    
692         John's simplification of MLTREE_BASIS.fcond broke a few machine
693         description things:
694    
695         rtl-build.{sig,sml} and hppa.mdl fixed.
696    
697         NOTE: the machine description stuff in the repository is still broken.
698               Again, I can't put my fixes in because that involves
699               changes to MLTREE.
700    
701    ----------------------------------------------------------------------
702    Name: Matthias Blume
703    Date: 2002/03/20 15:55:00 EST
704    Tag: blume-20020320-kmp
705    Description:
706    
707    Implemented Knuth-Morris-Pratt string matching in PreString and used
708    it for String.isSubstring, Substring.isSubstring, and
709    Substring.position.
710    
711    (Might need some stress-testing.  Simple examples worked fine.)
712    
713    ----------------------------------------------------------------------
714    Name: Matthias Blume
715    Date: 2002/03/19 16:37:00 EST
716    Tag: blume-20020319-witnesses
717    Description:
718    
719    Added a structure C.W and functions convert/Ptr.convert to ml-nlffi-lib.
720    
721    This implements a generic mechanism for changing constness qualifiers
722    anywhere within big C types without resorting to outright "casts".
723    (So far, functions such as C.rw/C.ro or C.Ptr.rw/C.Ptr.ro only let you
724    modify the constness at the outermost level.)
725    The implementation of "convert" is based on the idea of "witness"
726    values -- values that are not used by the operation but whose types
727    "testify" to their applicability.  On the implementation side, "convert"
728    is simply a projection (returning its second curried argument).  With
729    cross-module inlining, it should not result in any machine code being
730    generated.
731    
732    ----------------------------------------------------------------------
733    Name: Matthias Blume
734    Date: 2002/03/15 16:40:00 EST
735    Tag: blume-20020315-basis
736    Description:
737    
738    Provided (preliminary?) implementations for
739    
740      {String,Substring}.{concatWith,isSuffix,isSubstring}
741    
742    and
743    
744      Substring.full
745    
746    Those are in the Basis spec but they were missing in SML/NJ.
747    
748    ----------------------------------------------------------------------
749    Name: Matthias Blume
750    Date: 2002/03/14 21:30:00 EST
751    Tag: blume-20020314-controls
752    Description:
753    
754    Controls:
755    ---------
756    
757    1. Factored out the recently-added Controls : CONTROLS stuff and put
758       it into its own library $/controls-lib.cm.  The source tree for
759       this is under src/smlnj-lib/Controls.
760    
761    2. Changed the names of types and functions in this interface, so they
762       make a bit more "sense":
763    
764          module -> registry
765          'a registry -> 'a group
766    
767    3. The interface now deals in ref cells only.  The getter/setter interface
768       is (mostly) gone.
769    
770    4. Added a function that lets one register an already-existing ref cell.
771    
772    5. Made the corresponding modifications to the rest of the code so that
773       everything compiles again.
774    
775    6. Changed the implementation of Controls.MLRISC back to something closer
776       to the original.  In particular, this module (and therefore MLRISC)
777       does not depend on Controls.  There now is some link-time code in
778       int-sys.sml that registers the MLRISC controls with the Controls
779       module.
780    
781    CM:
782    ---
783    
784      * One can now specify the lambda-split aggressiveness in init.cmi.
785    
786    ----------------------------------------------------------------------
787    Name: Allen Leung
788    Date: 2002/03/13 17:30:00 EST
789    Tag: leunga-20020313-x86-fp-unary
790    Description:
791    
792    Bug fix for:
793    
794    > leunga@weaselbane:~/Yale/tmp/sml-dist{21} bin/sml
795    > Standard ML of New Jersey v110.39.1 [FLINT v1.5], March 08, 2002
796    > - fun f(x,(y,z)) = Real.~ y;
797    > [autoloading]
798    > [autoloading done]
799    >       fchsl   (%eax), 184(%esp)
800    > Error: MLRisc bug: X86MCEmitter.emitInstr
801    >
802    > uncaught exception Error
803    >   raised at: ../MLRISC/control/mlriscErrormsg.sml:16.14-16.19
804    
805    The problem was that the code generator did not generate any fp registers
806    in this case, and the ra didn't know that it needed to run the X86FP phase to
807    translate the pseudo fp instruction.   This only happened with unary fp
808    operators in certain situations.
809    
810    ----------------------------------------------------------------------
811    Name: Matthias Blume
812    Date: 2002/03/13 14:00:00 EST
813    Tag: blume-20020313-overload-etc
814    Description:
815    
816    1. Added _overload as a synonym for overload for backward compatibility.
817       (Control.overloadKW must be true for either version to be accepted.)
818    
819    2. Fixed bug in install script that caused more things to be installed
820       than what was requested in config/targets.
821    
822    3. Made CM aware of the (_)overload construct so that autoloading
823       works.
824    
825    ----------------------------------------------------------------------
826    Name: Matthias Blume
827    Date: 2002/03/12 22:03:00 EST
828    Tag: blume-20020312-url
829    Description:
830    
831    Forgot to update BOOT and srcarchiveurl.
832    
833    ----------------------------------------------------------------------
834    Name: Matthias Blume
835    Date: 2002/03/12 17:30:00 EST
836    Tag: blume-20020312-version110392
837    Description:
838    
839    Yet another version number bump (because of small changes to the
840    binfile format).  Version number is now 110.39.2.  NEW BOOTFILES!
841    
842    Changes:
843    
844      The new pid generation scheme described a few weeks ago was overly
845      complicated.  I implemented a new mechanism that is simpler and
846      provides a bit more "stability":  Once CM has seen a compilation
847      unit, it keeps its identity constant (as long as you do not delete
848      those crucial CM/GUID/* files).  This means that when you change
849      an interface, compile, then go back to the old interface, and
850      compile again, you arrive at the original pid.
851    
852      There now also is a mechanism that instructs CM to use the plain
853      environment hash as a module's pid (effectively making its GUID
854      the empty string).  For this, "noguid" must be specified as an
855      option to the .sml file in question within its .cm file.
856      This is most useful for code that is being generated by tools such
857      as ml-nlffigen (because during development programmers tend to
858      erase the tool's entire output directory tree including CM's cached
859      GUIDs).  "noguid" is somewhat dangerous (since it can be used to locally
860      revert to the old, broken behavior of SML/NJ, but in specific cases
861      where there is no danger of interface confusion, its use is ok
862      (I think).
863    
864      ml-nlffigen by default generates "noguid" annotations.  They can be
865      turned off by specifying -guid in its command line.
866    
867    ----------------------------------------------------------------------
868    Name: Lal George
869    Date: 2002/03/12 12 14:42:36 EST
870    Tag: george-20020312-frequency-computation
871    Description:
872    
873    Integrated jump chaining and static block frequency into the
874    compiler. More details and numbers later.
875    
876    ----------------------------------------------------------------------
877  Name: Lal George  Name: Lal George
878  Date: 2002/03/11 11 22:38:53 EST  Date: 2002/03/11 11 22:38:53 EST
879  Tag: george-20020311-jump-chain-elim  Tag: george-20020311-jump-chain-elim
# Line 60  Line 921 
921  ----------------------------------------------------------------------  ----------------------------------------------------------------------
922  Name: Allen Leung  Name: Allen Leung
923  Date: 2002/03/11 10:30:00 EST  Date: 2002/03/11 10:30:00 EST
924  Tag: leunga-20020310-runtime-string0  Tag: leunga-20020311-runtime-string0
925  Description:  Description:
926    
927     The representation of the empty string now points to a     The representation of the empty string now points to a

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