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Diff of /sml/trunk/HISTORY

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revision 1158, Fri Mar 22 01:21:25 2002 UTC revision 1282, Thu Oct 17 13:07:53 2002 UTC
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13  Description:  Description:
14    
15  ----------------------------------------------------------------------  ----------------------------------------------------------------------
16    Name: Matthias Blume
17    Date: 2002/10/17 09:10:00 EDT
18    Tag: Release_110_42
19    Description:
20    
21    In good old tradition, there has been a slight hiccup so that we have
22    to patch 110.42 after the fact.   The old release tag has been replaced
23    (see below).
24    
25    The change solves a problem with two competing approaches the
26    configuration problem regarding MacOS 10.1 vs. MacOS 10.2 which got in
27    each other's way.
28    
29    This change only affects the runtime system code and the installer script.
30    (No new bootfiles.)
31    
32    ----------------------------------------------------------------------
33    Name: Matthias Blume
34    Date: 2002/10/16 12:00:00 EDT
35    Tag: Release_110_42_removed
36    Description:
37    
38    New working release.  New bootfiles.
39    
40    ----------------------------------------------------------------------
41    Name: Matthias Blume
42    Date: 2002/10/10 13:10:00 EDT
43    Tag: blume-20021010-ppc-divs
44    Description:
45    
46    The mltree operator DIVS must be implemented with an overflow check on
47    the PPC because the hardware indicates divide-by-zero using "overflow" as
48    well.
49    
50    ----------------------------------------------------------------------
51    Name: Matthias Blume
52    Date: 2002/07/23 11:45:00
53    Tag: blume-20020723-smlnj-home
54    Description:
55    
56    Sml now senses the SMLNJ_HOME environment variable.  If this is set,
57    then the bin dir is assumed to be in $SMLNJ_HOME/bin and (unless
58    CM_PATHCONFIG is also set), the path configuration file is assumed
59    to be in $SMLNJ_HOME/lib/pathconfig.  This way one can easily move
60    the entire tree to some other place and everything will "just work".
61    
62    (Companion commands such as ml-build and ml-makedepend also sense this
63    variable.)
64    
65    ----------------------------------------------------------------------
66    Name: Matthias Blume
67    Date: 2002/07/12 21:19:00 EDT
68    Tag: blume-20020712-liveness
69    Description:
70    
71    Exported two useful "step" functions from liveness module (MLRISC).
72    
73    ----------------------------------------------------------------------
74    Name: Matthias Blume
75    Date: 2002/07/05 16:00 EDT
76    Tag: Release_110_41
77    Description:
78    
79    New working release.  New bootfiles.
80    
81    ----------------------------------------------------------------------
82    Name: Matthias Blume
83    Date: 2002/07/05 10:25:00 EDT
84    Tag: blume-20020705-btimp
85    Description:
86    
87    Exported structure BTImp from $smlnj/viscomp/debugprof.cm so that
88    other clients can set up backtracing support.
89    
90    ----------------------------------------------------------------------
91    Name: Matthias Blume
92    Date: 2002/06/25 17:23:00 EDT
93    Tag: blume-20020625-fpmax
94    Description:
95    
96    Fixed a bug in translation of INLMAX (and INLMIN) for the floating-point
97    case.  (The sense of the isNaN test was reversed -- which made min and
98    max always return their first argument.)
99    
100    ----------------------------------------------------------------------
101    Name: Matthias Blume
102    Date: 2002/06/11
103    Tag: blume-20020611-unixpath
104    Description:
105    
106    Back-ported OS.Path.{from,to}UnixPath from idlbasis-devel branch.
107    
108    ----------------------------------------------------------------------
109    Name: Matthias Blume
110    Date: 2002/06/10 16:35:00 EDT
111    Tag: blume-20020610-ieeereal
112    Description:
113    
114    I back-ported my implementation of IEEEReal.fromString from the
115    idlbasis-devel branch so that we can test it.
116    
117    Another small change is that ppDec tries to give more information
118    than just "<sig>" in the case of functors.  However, this code is
119    broken in some mysterious way if the functor's body's signature
120    has not been declared by ascription but gets inferred from the
121    implementation.  This needs fixing...
122    
123    ----------------------------------------------------------------------
124    Name: Matthias Blume
125    Date: 2002/05/31
126    Tag: blume-20020531-btrace-mode
127    Description:
128    
129    Resurrected SMLofNJ.Internals.BTrace.mode.  (It accidentally fell by
130    the wayside when I switched over to using Controls everywhere.)
131    
132    ----------------------------------------------------------------------
133    Name: Lal George
134    Date: 2002/05/23 12:21:40 EDT
135    Tag: george-20020523-visual-labels
136    Description:
137    
138    Labels are now displayed in the graphical output to make
139    the fall-through and target blocks obvious.
140    
141    ----------------------------------------------------------------------
142    Name: Matthias Blume
143    Date: 2002/05/22 11:03:00 EDT
144    Tag: blume-20020522-shrink
145    Description:
146    
147    John tweaked yesterday's fix for 1131 to handle an out-of-memory
148    situation that comes up when allocating huge arrays.
149    
150    ----------------------------------------------------------------------
151    Name: Matthias Blume
152    Date: 2002/05/21 16:00:00 EDT
153    Tag: Release_110_40
154    Description:
155    
156    New working release (110.40).  New bootfiles.
157    
158    [Also: John Reppy fixed GC bug 1131.]
159    
160    ----------------------------------------------------------------------
161    Name: Matthias Blume
162    Date: 2002/05/21 12:35:00 EDT
163    Tag: blume-20020521-cmdoc
164    Description:
165    
166    CM documentation update.
167    
168    ----------------------------------------------------------------------
169    Name: Matthias Blume
170    Date: 2002/05/21 10:55:00 EDT
171    Tag: blume-20020521-misc
172    Description:
173    
174    - John tweaked runtime to be silent on heap export (except when
175      GC messages are on).
176    - I added a few more things (cross-compiling versions of CMB) to
177      config/preloads (as suggestions).
178    
179    ----------------------------------------------------------------------
180    Name: Matthias Blume
181    Date: 2002/05/20 22:25:00 EDT
182    Tag: blume-20020520-controls
183    Description:
184    
185    - Added ControlUtil structure to control-lib.cm.
186    - Use it throughout.
187    - Used Controls facility to define MLRISC controls (as opposed to
188      registering MLRISC control ref cells with Controls after the fact)
189    - Fixed messed-up controls priorities.
190    
191    * Removed again all the stuff from config/preloads that one wouldn't
192      be able to preload at the time the initial heap image is built.
193      (Many libraries, e.g., CML, do not exist yet at this time.  The
194       only libraries that can be preloaded via config/preloads are those
195       that come bundled with the bootfiles.)
196    
197    ----------------------------------------------------------------------
198    Name: Matthias Blume
199    Date: 2002/05/20 10:59:00 EDT
200    Tag: blume-20020520-preloads
201    Description:
202    
203    Added a lot of commented-out suggestions for things to be included
204    in config/preloads.
205    
206    ----------------------------------------------------------------------
207    Name: Allen Leung
208    Date: 2002/05/18 14:20:00 EDT
209    Tag: leunga-20020518-mdl
210    Description:
211    
212    o Made the mdl tool stuff compile and run again.
213    o I've disabled all the stuff that depends on RTL specifications; they
214      are all badly broken anyway.
215    
216    ----------------------------------------------------------------------
217    Name: Matthias Blume
218    Date: 2002/05/17 16:49:00 EDT
219    Tag: blume-20020517-controls
220    Description:
221    
222    0. John Reppy made several modifications to the SML/NJ library.
223       In particular, there is a shiny new controls-lib.cm.
224    
225    1. Pushed new controls interface through compiler so that everything
226       compiles again.
227    
228    2. Added FormatComb and FORMAT_COMB to the CML version of the
229       SML/NJ library (so that CML compiles again).
230    
231    3. Modified init scripts because XXX_DEFAULT environment variables
232       are no longer with us.  (Boot-time initialization is now done
233       using the same environment variables that are also used for
234       startup-time initialization of controls.)
235    
236    ----------------------------------------------------------------------
237    Name: Lal George
238    Date: 2002/05/15 09:20:10 EDT
239    Tag: george-20020515-pseudo-op-decls
240    Description:
241    
242            All pseudo-ops emitted before the first segment declaration
243    such as TEXT, DATA, and BSS directives are assumed to be global
244    declarations and are emitted first in the assembly file. This is
245    useful in a number of situations where one has pseudo-ops that are not
246    specific to any segment, and also works around the constraint that one
247    cannot have client pseudo-ops in the TEXT segment.
248    
249            Because no segment is associated with these declarations it is
250    an error to allocate any space or objects before the first segment
251    directive and an exception will be raised. However, we cannot make
252    this check for client pseudo-ops.
253    
254            These top level declarations are a field in the CFG graph_info.
255    In theory you can continue to add to this field after the CFG has been
256    built -- provided you know what you are doing;-)
257    
258    ----------------------------------------------------------------------
259    Name: Matthias Blume
260    Date: 2002/05/13 16:40:00 EDT
261    Tag: blume-20020513-pp-etc
262    Description:
263    
264    A few minor bugfixes:
265    
266      - Stopgap measure for bug recently reported by Elsa Gunter (ppDec).
267        (Bogus printouts for redefined bindings still occur.  Compiler
268        bug should no longer occur now.  We need to redo the prettyprinter
269        from scratch.)
270    
271      - CM pathname printer now also adds escape sequences for ( and )
272    
273      - commend and docu fixes for ml-nlffi
274    
275    ----------------------------------------------------------------------
276    Name: Matthias Blume
277    Date: 2002/05/10 16:40:00 EDT
278    Tag: blume-20020510-erg-textio
279    Description:
280    
281    Applied the following bugfix provided by Emden Gansner:
282    
283        Output is corrupted when outputSubstr is used rather than output.
284    
285        The problem occurs when a substring
286    
287            ss = (s, dataStart, dataLen)
288    
289        where dataStart > 0, fills a stream buffer with avail bytes left.
290        avail bytes of s, starting at index dataStart, are copied into the
291        buffer, the buffer is flushed, and then the remaining dataLen-avail
292        bytes of ss are copied into the beginning of the buffer. Instead of
293        starting this copy at index dataStart+avail in s, the current code
294        starts the copy at index avail.
295    
296        Fix:
297        In text-io-fn.sml, change line 695 from
298             val needsFlush = copyVec(v, avail, dataLen-avail, buf, 0)
299        to
300             val needsFlush = copyVec(v, dataStart+avail, dataLen-avail, buf, 0)
301    
302    ----------------------------------------------------------------------
303    Name: Matthias Blume
304    Date: 2002/04/12 13:55:00 EDT
305    Tag: blume-20020412-assyntax
306    Description:
307    
308    1. Grabbed newer assyntax.h from the XFree86 project.
309    2. Fiddled with how to compile X86.prim.asm without warnings.
310    3. (Very) Minor cleanup in CM.
311    
312    ----------------------------------------------------------------------
313    Name: Matthias Blume
314    Date: 2002/04/01 (no joke!) 17:07:00 EST
315    Tag: blume-20020401-x86div
316    Description:
317    
318    Added full support for div/mod/rem/quot on the x86, using the machine
319    instruction's two results (without clumsily recomputing the remainder)
320    directly where appropriate.
321    
322    Some more extensive power-of-two support was added to the x86 instruction
323    selector (avoiding expensive divs, mods, and muls where they can be
324    replaced with cheaper shifts and masks).  However, this sort of thing
325    ought to be done earlier, e.g., within the CPS optimizer so that
326    all architectures benefit from it.
327    
328    The compiler compiles to a fixed point, but changes might be somewhat
329    fragile nevertheless.  Please, report any strange things that you might
330    see wrt. div/mod/quot/rem...
331    
332    ----------------------------------------------------------------------
333    Name: Matthias Blume
334    Date: 2002/03/29 17:22:00
335    Tag: blume-20020329-div
336    Description:
337    
338    Fixed my broken div/mod logic.  Unfortunately, this means that the
339    inline code for div/mod now has one more comparison than before.
340    Fast paths (quotient > 0 or remainder = 0) are not affected, though.
341    The problem was with quotient = 0, because that alone does not tell
342    us which way the rounding went.  One then has to look at whether
343    remainder and divisor have the same sign...  :(
344    
345    Anyway, I replaced the bootfiles with fresh ones...
346    
347    ----------------------------------------------------------------------
348    Name: Matthias Blume
349    Date: 2002/03/29 14:10:00 EST
350    Tag: blume-20020329-inlprims
351    Description:
352    
353    NEW BOOTFILES!!!    Version number bumped to 110.39.3.
354    
355    Primops have changed. This means that the bin/boot-file formats have
356    changed as well.
357    
358    To make sure that there is no confusion, I made a new version.
359    
360    
361    CHANGES:
362    
363    * removed REMT from mltree (remainder should never overflow).
364    
365    * added primops to deal with divisions of all flavors to the frontend
366    
367    * handled these primops all the way through so they map to their respective
368      MLRISC support
369    
370    * used these primops in the implementation of Int, Int32, Word, Word32
371    
372    * removed INLDIV, INLMOD, and INLREM as they are no longer necessary
373    
374    * parameterized INLMIN, INLMAX, and INLABS by a numkind
375    
376    * translate.sml now deals with all flavors of INL{MIN,MAX,ABS}, including
377      floating point
378    
379    * used INL{MIN,MAX,ABS} in the implementation of Int, Int32, Word, Word32,
380      and Real (but Real.abs maps to a separate floating-point-only primop)
381    
382    
383    TODO items:
384    
385    * Hacked Alpha32 instruction selection, disabling the selection of REMx
386      instructions because the machine instruction encoder cannot handle
387      them.  (Hppa, PPC, and Sparc instruction selection did not handle
388      REM in the first place, and REM is supported by the x86 machine coder.)
389    
390    * Handle DIV and MOD with DIV_TO_NEGINF directly in the x86 instruction
391      selection phase.  (The two can be streamlined because the hardware
392      delivers both quotient and remainder at the same time anyway.)
393    
394    * Think about what to do with "valOf(Int32.minInt) div ~1" and friends.
395      (Currently the behavior is inconsistent both across architectures and
396      wrt. the draft Basis spec.)
397    
398    * Word8 should eventually be handled natively, too.
399    
400    * There seems to be one serious bug in mltree-gen.sml.  It appears, though,
401      as if there currently is no execution path that could trigger it in
402      SML/NJ.  (The assumptions underlying functions arith and promotable do not
403      hold for things like multiplication and division.)
404    
405    ----------------------------------------------------------------------
406    Name: Matthias Blume
407    Date: 2002/03/27 16:27:00 EST
408    Tag: blume-20020327-mlrisc-divisions
409    Description:
410    
411    Added support for all four division operations (ML's div, mod, quot,
412    and rem) to MLRISC.  In the course of doing so, I also rationalized
413    the naming (no more annoying switch-around of DIV and QUOT), by
414    parameterizing the operation by div_rounding_mode (which can be either
415    DIV_TO_ZERO or DIV_TO_NEGINF).
416    
417    The generic MLTreeGen functor takes care of compiling all four
418    operations down to only round-to-zero div.
419    
420    Missing pieces:
421    
422      * Doing something smarter than relying on MLTreeGen on architectures
423        like, e.g., the x86 where hardware division delivers both quotient and
424        remainder at the same time.  With this, the implementation of the
425        round-to-neginf operations could be further streamlined.
426    
427      * Remove inlining support for div/mod/rem from the frontend and replace it
428        with primops that get carried through to the backend.  Do this for all
429        int and word types.
430    
431    ----------------------------------------------------------------------
432    Name: Matthias Blume
433    Date: 2002/03/25 17:25:00 EST
434    Tag: blume-20020325-divmod
435    Description:
436    
437    I improved (hopefully without breaking them) the implementation of Int.div,
438    Int.mod, and Int.rem.   For this, the code in translate.sml now takes
439    advantage of the following observations:
440    
441      Let  q = x quot y      r = x rem y
442           d = x div  y      m = x mod y
443    
444    where "quot" is the round-to-zero version of integer division that
445    hardware usually provides.  Then we have:
446    
447         r = x - q * y        where neither the * nor the - will overflow
448         d = if q >= 0 orelse x = q * y then q else q - 1
449                              where neither the * nor the - will overflow
450         m = if q >= 0 orelse r = 0 then r else r + y
451                              where the + will not overflow
452    
453    This results in substantial simplification of the generated code.
454    The following table shows the number of CFG nodes and edges generated
455    for
456            fun f (x, y) = x OPER y
457            (* with OPER \in div, mod, quot, rem *)
458    
459    
460        OPER | nodes(old) | edges(old) | nodes(new) | edges(new)
461        --------------------------------------------------------
462         div |         24 |         39 |         12 |         16
463         mod |         41 |         71 |         12 |         16
464        quot |          8 |         10 |          8 |         10
465         rem |         10 |         14 |          8 |         10
466    
467    
468    ----------------------------------------------------------------------
469    Name: Matthias Blume
470    Date: 2002/03/25 22:06:00 EST
471    Tag: blume-20020325-cprotobug
472    Description:
473    
474    Fixed a bug in cproto (c prototype decoder).
475    
476    ----------------------------------------------------------------------
477    Name: Matthias Blume
478    Date: 2002/03/25 16:00:00 EST
479    Tag: blume-20020325-raw-primops
480    Description:
481    
482    I did some cleanup to Allen's new primop code and
483    replaced yesterday's bootfiles with new ones.
484    (But they are stored in the same place.)
485    
486    ----------------------------------------------------------------------
487    Name: Matthias Blume
488    Date: 2002/03/24 22:40:00 EST
489    Tag: blume-20020324-bootfiles
490    Description:
491    
492    Made the bootfiles that Allen asked for.
493    
494    ----------------------------------------------------------------------
495    Name: Allen Leung
496    Date: 2002/03/23 15:50:00 EST
497    Tag: leunga-20020323-flint-cps-rcc-primops
498    Description:
499    
500      1. Changes to FLINT primops:
501    
502        (* make a call to a C-function;
503         * The primop carries C function prototype information and specifies
504         * which of its (ML-) arguments are floating point. C prototype
505         * information is for use by the backend, ML information is for
506         * use by the CPS converter. *)
507      | RAW_CCALL of { c_proto: CTypes.c_proto,
508                       ml_args: ccall_type list,
509                       ml_res_opt: ccall_type option,
510                       reentrant : bool
511                     } option
512       (* Allocate uninitialized storage on the heap.
513        * The record is meant to hold short-lived C objects, i.e., they
514        * are not ML pointers.  With the tag, the representation is
515        * the same as RECORD with tag tag_raw32 (sz=4), or tag_fblock (sz=8)
516        *)
517      | RAW_RECORD of {tag:bool,sz:int}
518      and ccall_type = CCALL_INT32 | CCALL_REAL64 | CCALL_ML_PTR
519    
520      2.  These CPS primops are now overloaded:
521    
522           rawload of {kind:numkind}
523           rawstore of {kind:numkind}
524    
525          The one argument form is:
526    
527             rawload {kind} address
528    
529          The two argument form is:
530    
531             rawload {kind} [ml object, byte-offset]
532    
533      3. RAW_CCALL/RCC now takes two extra arguments:
534    
535         a. The first is whether the C call is reentrant, i.e., whether
536            ML state should be saved and restored.
537         b. The second argument is a string argument specifying the name of
538            library and the C function.
539    
540         These things are currently not handled in the code generator, yet.
541    
542      4. In CProto,
543    
544         An encoding type of "bool" means "ml object" and is mapped into
545         C prototype of PTR.  Note that "bool" is different than "string",
546         even though "string" is also mapped into PTR, because "bool"
547         is assigned an CPS type of BOGt, while "string" is assigned INT32t.
548    
549      5. Pickler/unpicker
550    
551         Changed to handle RAW_RECORD and newest RAW_CCALL
552    
553      6. MLRiscGen,
554    
555         1. Changed to handle the new rawload/rawstore/rawrecord operators.
556         2. Code for handling C Calls has been moved to a new module CPSCCalls,
557            in the file CodeGen/cpscompile/cps-c-calls.sml
558    
559      7. Added the conditional move operator
560    
561             condmove of branch
562    
563         to cps.  Generation of this is still buggy so it is currently
564         disabled.
565    
566    ----------------------------------------------------------------------
567    Name: Lal George
568    Date: 2002/03/22 14:18:25 EST
569    Tag: george-20020322-cps-branch-prob
570    Description:
571    
572    Implemented the Ball-Larus branch prediction-heuristics, and
573    incorporated graphical viewers for control flow graphs.
574    
575    Ball-Larus Heuristics:
576    ---------------------
577    See the file compiler/CodeGen/cpscompile/cpsBranchProb.sml.
578    
579    By design it uses the Dempster-Shafer theory for combining
580    probabilities.  For example, in the function:
581    
582        fun f(n,acc) = if n = 0 then acc else f(n-1, n*acc)
583    
584    the ball-larus heuristics predicts that the n=0 is unlikely
585    (OH-heuristic), and the 'then' branch is unlikely because of the
586    RH-heuristic -- giving the 'then' branch an even lower combined
587    probability using the Dempster-Shafer theory.
588    
589    Finally, John Reppy's loop analysis in MLRISC, further lowers the
590    probability of the 'then' branch because of the loop in the else
591    branch.
592    
593    
594    Graphical Viewing:
595    ------------------
596    I merely plugged in Allen's graphical viewers into the compiler. The
597    additional code is not much. At the top level, saying:
598    
599            Control.MLRISC.getFlag "cfg-graphical-view" := true;
600    
601    will display the graphical view of the control flow graph just before
602    back-patching.  daVinci must be in your path for this to work. If
603    daVinci is not available, then the default viewer can be changed
604    using:
605    
606            Control.MLRISC.getString "viewer"
607    
608    which can be set to "dot" or "vcg" for the corresponding viewers. Of
609    course, these viewers must be in your path.
610    
611    The above will display the compilation unit at the level of clusters,
612    many of which are small, boring, and un-interesting. Also setting:
613    
614            Control.MLRISC.getInt "cfg-graphical-view_size"
615    
616    will display clusters that are larger than the value set by the above.
617    
618    
619    ----------------------------------------------------------------------
620    Name: Matthias Blume
621    Date: 2002/03/21 22:20:00 EST
622    Tag: blume-20020321-kmp-bugfix
623    Description:
624    
625    Changed the interface to the KMP routine in PreString and fixed
626    a minor bug in one place where it was used.
627    
628    ----------------------------------------------------------------------
629  Name: Allen Leung  Name: Allen Leung
630  Date: 2002/03/21 20:30:00 EST  Date: 2002/03/21 20:30:00 EST
631  Tag: leunga-20020321-cfg  Tag: leunga-20020321-cfg

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