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Diff of /sml/trunk/HISTORY

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revision 1168, Fri Mar 22 19:19:32 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  Name: Lal George
588  Date: 2002/03/22 14:18:25 EST  Date: 2002/03/22 14:18:25 EST
589  Tag: blume-20020321-cps-branch-prob  Tag: george-20020322-cps-branch-prob
590  Description:  Description:
591    
592  Implemented the Ball-Larus branch prediction-heuristic, and  Implemented the Ball-Larus branch prediction-heuristics, and
593  incorporated graphical viewers for control flow graphs.  incorporated graphical viewers for control flow graphs.
594    
595  Ball-Larus Heuristic:  Ball-Larus Heuristics:
596  ---------------------  ---------------------
597  See the file compiler/CodeGen/cpscompile/cpsBranchProb.sml.  See the file compiler/CodeGen/cpscompile/cpsBranchProb.sml.
598    
# Line 33  Line 604 
604  the ball-larus heuristics predicts that the n=0 is unlikely  the ball-larus heuristics predicts that the n=0 is unlikely
605  (OH-heuristic), and the 'then' branch is unlikely because of the  (OH-heuristic), and the 'then' branch is unlikely because of the
606  RH-heuristic -- giving the 'then' branch an even lower combined  RH-heuristic -- giving the 'then' branch an even lower combined
607  probability using the Dempster-Shater theory.  probability using the Dempster-Shafer theory.
608    
609  Finally, John Reppy's loop analysis in MLRISC, further lowers the  Finally, John Reppy's loop analysis in MLRISC, further lowers the
610  probability of the 'then' branch because of the loop in the else  probability of the 'then' branch because of the loop in the else

Legend:
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