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Diff of /sml/trunk/HISTORY

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revision 592, Mon Apr 3 07:04:12 2000 UTC revision 1211, Tue May 21 14:54:32 2002 UTC
# Line 8  Line 8 
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
17    Date: 2002/05/21 10:55:00 EDT
18    Tag: blume-20020521-misc
19    Description:
20    
21    - John tweaked runtime to be silent on heap export (except when
22      GC messages are on).
23    - I added a few more things (cross-compiling versions of CMB) to
24      config/preloads (as suggestions).
25    
26    ----------------------------------------------------------------------
27    Name: Matthias Blume
28    Date: 2002/05/20 22:25:00 EDT
29    Tag: blume-20020520-controls
30    Description:
31    
32    - Added ControlUtil structure to control-lib.cm.
33    - Use it throughout.
34    - Used Controls facility to define MLRISC controls (as opposed to
35      registering MLRISC control ref cells with Controls after the fact)
36    - Fixed messed-up controls priorities.
37    
38    * Removed again all the stuff from config/preloads that one wouldn't
39      be able to preload at the time the initial heap image is built.
40      (Many libraries, e.g., CML, do not exist yet at this time.  The
41       only libraries that can be preloaded via config/preloads are those
42       that come bundled with the bootfiles.)
43    
44    ----------------------------------------------------------------------
45    Name: Matthias Blume
46    Date: 2002/05/20 10:59:00 EDT
47    Tag: blume-20020520-preloads
48    Description:
49    
50    Added a lot of commented-out suggestions for things to be included
51    in config/preloads.
52    
53    ----------------------------------------------------------------------
54    Name: Allen Leung
55    Date: 2002/05/18 14:20:00 EDT
56    Tag: leunga-20020518-mdl
57    Description:
58    
59    o Made the mdl tool stuff compile and run again.
60    o I've disabled all the stuff that depends on RTL specifications; they
61      are all badly broken anyway.
62    
63    ----------------------------------------------------------------------
64    Name: Matthias Blume
65    Date: 2002/05/17 16:49:00 EDT
66    Tag: blume-20020517-controls
67    Description:
68    
69    0. John Reppy made several modifications to the SML/NJ library.
70       In particular, there is a shiny new controls-lib.cm.
71    
72    1. Pushed new controls interface through compiler so that everything
73       compiles again.
74    
75    2. Added FormatComb and FORMAT_COMB to the CML version of the
76       SML/NJ library (so that CML compiles again).
77    
78    3. Modified init scripts because XXX_DEFAULT environment variables
79       are no longer with us.  (Boot-time initialization is now done
80       using the same environment variables that are also used for
81       startup-time initialization of controls.)
82    
83    ----------------------------------------------------------------------
84    Name: Lal George
85    Date: 2002/05/15 09:20:10 EDT
86    Tag: george-20020515-pseudo-op-decls
87    Description:
88    
89            All pseudo-ops emitted before the first segment declaration
90    such as TEXT, DATA, and BSS directives are assumed to be global
91    declarations and are emitted first in the assembly file. This is
92    useful in a number of situations where one has pseudo-ops that are not
93    specific to any segment, and also works around the constraint that one
94    cannot have client pseudo-ops in the TEXT segment.
95    
96            Because no segment is associated with these declarations it is
97    an error to allocate any space or objects before the first segment
98    directive and an exception will be raised. However, we cannot make
99    this check for client pseudo-ops.
100    
101            These top level declarations are a field in the CFG graph_info.
102    In theory you can continue to add to this field after the CFG has been
103    built -- provided you know what you are doing;-)
104    
105    ----------------------------------------------------------------------
106    Name: Matthias Blume
107    Date: 2002/05/13 16:40:00 EDT
108    Tag: blume-20020513-pp-etc
109    Description:
110    
111    A few minor bugfixes:
112    
113      - Stopgap measure for bug recently reported by Elsa Gunter (ppDec).
114        (Bogus printouts for redefined bindings still occur.  Compiler
115        bug should no longer occur now.  We need to redo the prettyprinter
116        from scratch.)
117    
118      - CM pathname printer now also adds escape sequences for ( and )
119    
120      - commend and docu fixes for ml-nlffi
121    
122    ----------------------------------------------------------------------
123    Name: Matthias Blume
124    Date: 2002/05/10 16:40:00 EDT
125    Tag: blume-20020510-erg-textio
126    Description:
127    
128    Applied the following bugfix provided by Emden Gansner:
129    
130        Output is corrupted when outputSubstr is used rather than output.
131    
132        The problem occurs when a substring
133    
134            ss = (s, dataStart, dataLen)
135    
136        where dataStart > 0, fills a stream buffer with avail bytes left.
137        avail bytes of s, starting at index dataStart, are copied into the
138        buffer, the buffer is flushed, and then the remaining dataLen-avail
139        bytes of ss are copied into the beginning of the buffer. Instead of
140        starting this copy at index dataStart+avail in s, the current code
141        starts the copy at index avail.
142    
143        Fix:
144        In text-io-fn.sml, change line 695 from
145             val needsFlush = copyVec(v, avail, dataLen-avail, buf, 0)
146        to
147             val needsFlush = copyVec(v, dataStart+avail, dataLen-avail, buf, 0)
148    
149    ----------------------------------------------------------------------
150    Name: Matthias Blume
151    Date: 2002/04/12 13:55:00 EDT
152    Tag: blume-20020412-assyntax
153    Description:
154    
155    1. Grabbed newer assyntax.h from the XFree86 project.
156    2. Fiddled with how to compile X86.prim.asm without warnings.
157    3. (Very) Minor cleanup in CM.
158    
159    ----------------------------------------------------------------------
160    Name: Matthias Blume
161    Date: 2002/04/01 (no joke!) 17:07:00 EST
162    Tag: blume-20020401-x86div
163    Description:
164    
165    Added full support for div/mod/rem/quot on the x86, using the machine
166    instruction's two results (without clumsily recomputing the remainder)
167    directly where appropriate.
168    
169    Some more extensive power-of-two support was added to the x86 instruction
170    selector (avoiding expensive divs, mods, and muls where they can be
171    replaced with cheaper shifts and masks).  However, this sort of thing
172    ought to be done earlier, e.g., within the CPS optimizer so that
173    all architectures benefit from it.
174    
175    The compiler compiles to a fixed point, but changes might be somewhat
176    fragile nevertheless.  Please, report any strange things that you might
177    see wrt. div/mod/quot/rem...
178    
179    ----------------------------------------------------------------------
180    Name: Matthias Blume
181    Date: 2002/03/29 17:22:00
182    Tag: blume-20020329-div
183    Description:
184    
185    Fixed my broken div/mod logic.  Unfortunately, this means that the
186    inline code for div/mod now has one more comparison than before.
187    Fast paths (quotient > 0 or remainder = 0) are not affected, though.
188    The problem was with quotient = 0, because that alone does not tell
189    us which way the rounding went.  One then has to look at whether
190    remainder and divisor have the same sign...  :(
191    
192    Anyway, I replaced the bootfiles with fresh ones...
193    
194    ----------------------------------------------------------------------
195    Name: Matthias Blume
196    Date: 2002/03/29 14:10:00 EST
197    Tag: blume-20020329-inlprims
198    Description:
199    
200    NEW BOOTFILES!!!    Version number bumped to 110.39.3.
201    
202    Primops have changed. This means that the bin/boot-file formats have
203    changed as well.
204    
205    To make sure that there is no confusion, I made a new version.
206    
207    
208    CHANGES:
209    
210    * removed REMT from mltree (remainder should never overflow).
211    
212    * added primops to deal with divisions of all flavors to the frontend
213    
214    * handled these primops all the way through so they map to their respective
215      MLRISC support
216    
217    * used these primops in the implementation of Int, Int32, Word, Word32
218    
219    * removed INLDIV, INLMOD, and INLREM as they are no longer necessary
220    
221    * parameterized INLMIN, INLMAX, and INLABS by a numkind
222    
223    * translate.sml now deals with all flavors of INL{MIN,MAX,ABS}, including
224      floating point
225    
226    * used INL{MIN,MAX,ABS} in the implementation of Int, Int32, Word, Word32,
227      and Real (but Real.abs maps to a separate floating-point-only primop)
228    
229    
230    TODO items:
231    
232    * Hacked Alpha32 instruction selection, disabling the selection of REMx
233      instructions because the machine instruction encoder cannot handle
234      them.  (Hppa, PPC, and Sparc instruction selection did not handle
235      REM in the first place, and REM is supported by the x86 machine coder.)
236    
237    * Handle DIV and MOD with DIV_TO_NEGINF directly in the x86 instruction
238      selection phase.  (The two can be streamlined because the hardware
239      delivers both quotient and remainder at the same time anyway.)
240    
241    * Think about what to do with "valOf(Int32.minInt) div ~1" and friends.
242      (Currently the behavior is inconsistent both across architectures and
243      wrt. the draft Basis spec.)
244    
245    * Word8 should eventually be handled natively, too.
246    
247    * There seems to be one serious bug in mltree-gen.sml.  It appears, though,
248      as if there currently is no execution path that could trigger it in
249      SML/NJ.  (The assumptions underlying functions arith and promotable do not
250      hold for things like multiplication and division.)
251    
252    ----------------------------------------------------------------------
253    Name: Matthias Blume
254    Date: 2002/03/27 16:27:00 EST
255    Tag: blume-20020327-mlrisc-divisions
256    Description:
257    
258    Added support for all four division operations (ML's div, mod, quot,
259    and rem) to MLRISC.  In the course of doing so, I also rationalized
260    the naming (no more annoying switch-around of DIV and QUOT), by
261    parameterizing the operation by div_rounding_mode (which can be either
262    DIV_TO_ZERO or DIV_TO_NEGINF).
263    
264    The generic MLTreeGen functor takes care of compiling all four
265    operations down to only round-to-zero div.
266    
267    Missing pieces:
268    
269      * Doing something smarter than relying on MLTreeGen on architectures
270        like, e.g., the x86 where hardware division delivers both quotient and
271        remainder at the same time.  With this, the implementation of the
272        round-to-neginf operations could be further streamlined.
273    
274      * Remove inlining support for div/mod/rem from the frontend and replace it
275        with primops that get carried through to the backend.  Do this for all
276        int and word types.
277    
278    ----------------------------------------------------------------------
279    Name: Matthias Blume
280    Date: 2002/03/25 17:25:00 EST
281    Tag: blume-20020325-divmod
282    Description:
283    
284    I improved (hopefully without breaking them) the implementation of Int.div,
285    Int.mod, and Int.rem.   For this, the code in translate.sml now takes
286    advantage of the following observations:
287    
288      Let  q = x quot y      r = x rem y
289           d = x div  y      m = x mod y
290    
291    where "quot" is the round-to-zero version of integer division that
292    hardware usually provides.  Then we have:
293    
294         r = x - q * y        where neither the * nor the - will overflow
295         d = if q >= 0 orelse x = q * y then q else q - 1
296                              where neither the * nor the - will overflow
297         m = if q >= 0 orelse r = 0 then r else r + y
298                              where the + will not overflow
299    
300    This results in substantial simplification of the generated code.
301    The following table shows the number of CFG nodes and edges generated
302    for
303            fun f (x, y) = x OPER y
304            (* with OPER \in div, mod, quot, rem *)
305    
306    
307        OPER | nodes(old) | edges(old) | nodes(new) | edges(new)
308        --------------------------------------------------------
309         div |         24 |         39 |         12 |         16
310         mod |         41 |         71 |         12 |         16
311        quot |          8 |         10 |          8 |         10
312         rem |         10 |         14 |          8 |         10
313    
314    
315    ----------------------------------------------------------------------
316    Name: Matthias Blume
317    Date: 2002/03/25 22:06:00 EST
318    Tag: blume-20020325-cprotobug
319    Description:
320    
321    Fixed a bug in cproto (c prototype decoder).
322    
323    ----------------------------------------------------------------------
324    Name: Matthias Blume
325    Date: 2002/03/25 16:00:00 EST
326    Tag: blume-20020325-raw-primops
327    Description:
328    
329    I did some cleanup to Allen's new primop code and
330    replaced yesterday's bootfiles with new ones.
331    (But they are stored in the same place.)
332    
333    ----------------------------------------------------------------------
334    Name: Matthias Blume
335    Date: 2002/03/24 22:40:00 EST
336    Tag: blume-20020324-bootfiles
337    Description:
338    
339    Made the bootfiles that Allen asked for.
340    
341    ----------------------------------------------------------------------
342    Name: Allen Leung
343    Date: 2002/03/23 15:50:00 EST
344    Tag: leunga-20020323-flint-cps-rcc-primops
345    Description:
346    
347      1. Changes to FLINT primops:
348    
349        (* make a call to a C-function;
350         * The primop carries C function prototype information and specifies
351         * which of its (ML-) arguments are floating point. C prototype
352         * information is for use by the backend, ML information is for
353         * use by the CPS converter. *)
354      | RAW_CCALL of { c_proto: CTypes.c_proto,
355                       ml_args: ccall_type list,
356                       ml_res_opt: ccall_type option,
357                       reentrant : bool
358                     } option
359       (* Allocate uninitialized storage on the heap.
360        * The record is meant to hold short-lived C objects, i.e., they
361        * are not ML pointers.  With the tag, the representation is
362        * the same as RECORD with tag tag_raw32 (sz=4), or tag_fblock (sz=8)
363        *)
364      | RAW_RECORD of {tag:bool,sz:int}
365      and ccall_type = CCALL_INT32 | CCALL_REAL64 | CCALL_ML_PTR
366    
367      2.  These CPS primops are now overloaded:
368    
369           rawload of {kind:numkind}
370           rawstore of {kind:numkind}
371    
372          The one argument form is:
373    
374             rawload {kind} address
375    
376          The two argument form is:
377    
378             rawload {kind} [ml object, byte-offset]
379    
380      3. RAW_CCALL/RCC now takes two extra arguments:
381    
382         a. The first is whether the C call is reentrant, i.e., whether
383            ML state should be saved and restored.
384         b. The second argument is a string argument specifying the name of
385            library and the C function.
386    
387         These things are currently not handled in the code generator, yet.
388    
389      4. In CProto,
390    
391         An encoding type of "bool" means "ml object" and is mapped into
392         C prototype of PTR.  Note that "bool" is different than "string",
393         even though "string" is also mapped into PTR, because "bool"
394         is assigned an CPS type of BOGt, while "string" is assigned INT32t.
395    
396      5. Pickler/unpicker
397    
398         Changed to handle RAW_RECORD and newest RAW_CCALL
399    
400      6. MLRiscGen,
401    
402         1. Changed to handle the new rawload/rawstore/rawrecord operators.
403         2. Code for handling C Calls has been moved to a new module CPSCCalls,
404            in the file CodeGen/cpscompile/cps-c-calls.sml
405    
406      7. Added the conditional move operator
407    
408             condmove of branch
409    
410         to cps.  Generation of this is still buggy so it is currently
411         disabled.
412    
413    ----------------------------------------------------------------------
414    Name: Lal George
415    Date: 2002/03/22 14:18:25 EST
416    Tag: george-20020322-cps-branch-prob
417    Description:
418    
419    Implemented the Ball-Larus branch prediction-heuristics, and
420    incorporated graphical viewers for control flow graphs.
421    
422    Ball-Larus Heuristics:
423    ---------------------
424    See the file compiler/CodeGen/cpscompile/cpsBranchProb.sml.
425    
426    By design it uses the Dempster-Shafer theory for combining
427    probabilities.  For example, in the function:
428    
429        fun f(n,acc) = if n = 0 then acc else f(n-1, n*acc)
430    
431    the ball-larus heuristics predicts that the n=0 is unlikely
432    (OH-heuristic), and the 'then' branch is unlikely because of the
433    RH-heuristic -- giving the 'then' branch an even lower combined
434    probability using the Dempster-Shafer theory.
435    
436    Finally, John Reppy's loop analysis in MLRISC, further lowers the
437    probability of the 'then' branch because of the loop in the else
438    branch.
439    
440    
441    Graphical Viewing:
442    ------------------
443    I merely plugged in Allen's graphical viewers into the compiler. The
444    additional code is not much. At the top level, saying:
445    
446            Control.MLRISC.getFlag "cfg-graphical-view" := true;
447    
448    will display the graphical view of the control flow graph just before
449    back-patching.  daVinci must be in your path for this to work. If
450    daVinci is not available, then the default viewer can be changed
451    using:
452    
453            Control.MLRISC.getString "viewer"
454    
455    which can be set to "dot" or "vcg" for the corresponding viewers. Of
456    course, these viewers must be in your path.
457    
458    The above will display the compilation unit at the level of clusters,
459    many of which are small, boring, and un-interesting. Also setting:
460    
461            Control.MLRISC.getInt "cfg-graphical-view_size"
462    
463    will display clusters that are larger than the value set by the above.
464    
465    
466    ----------------------------------------------------------------------
467    Name: Matthias Blume
468    Date: 2002/03/21 22:20:00 EST
469    Tag: blume-20020321-kmp-bugfix
470    Description:
471    
472    Changed the interface to the KMP routine in PreString and fixed
473    a minor bug in one place where it was used.
474    
475    ----------------------------------------------------------------------
476    Name: Allen Leung
477    Date: 2002/03/21 20:30:00 EST
478    Tag: leunga-20020321-cfg
479    Description:
480    
481      Fixed a potential problem in cfg edge splitting.
482    
483    ----------------------------------------------------------------------
484    Name: Allen Leung
485    Date: 2002/03/21 17:15:00 EST
486    Tag: leunga-20020321-x86-fp-cfg
487    Description:
488    
489      1. Recoded the buggy parts of x86-fp.
490    
491         a. All the block reordering code has been removed.
492            We now depend on the block placement phases to do this work.
493    
494         b. Critical edge splitting code has been simplified and moved into the
495            CFG modules, as where they belong.
496    
497         Both of these were quite buggy and complex.  The code is now much, much
498         simpler.
499    
500      2. X86 backend.
501    
502         a. Added instructions for 64-bit support.  Instruction selection for
503            64-bit has not been committed, however, since that
504            requires changes to MLTREE which haven't been approved by
505            Lal and John.
506    
507         b. Added support for FUCOMI and FUCOMIP when generating code for
508            PentiumPro and above.  We only generate these instructions in
509            the fast-fp mode.
510    
511         c. Added cases for JP and JNP in X86FreqProps.
512    
513      3. CFG
514    
515         CFG now has a bunch of methods for edge splitting and merging.
516    
517      4. Machine description.
518    
519         John's simplification of MLTREE_BASIS.fcond broke a few machine
520         description things:
521    
522         rtl-build.{sig,sml} and hppa.mdl fixed.
523    
524         NOTE: the machine description stuff in the repository is still broken.
525               Again, I can't put my fixes in because that involves
526               changes to MLTREE.
527    
528    ----------------------------------------------------------------------
529    Name: Matthias Blume
530    Date: 2002/03/20 15:55:00 EST
531    Tag: blume-20020320-kmp
532    Description:
533    
534    Implemented Knuth-Morris-Pratt string matching in PreString and used
535    it for String.isSubstring, Substring.isSubstring, and
536    Substring.position.
537    
538    (Might need some stress-testing.  Simple examples worked fine.)
539    
540    ----------------------------------------------------------------------
541    Name: Matthias Blume
542    Date: 2002/03/19 16:37:00 EST
543    Tag: blume-20020319-witnesses
544    Description:
545    
546    Added a structure C.W and functions convert/Ptr.convert to ml-nlffi-lib.
547    
548    This implements a generic mechanism for changing constness qualifiers
549    anywhere within big C types without resorting to outright "casts".
550    (So far, functions such as C.rw/C.ro or C.Ptr.rw/C.Ptr.ro only let you
551    modify the constness at the outermost level.)
552    The implementation of "convert" is based on the idea of "witness"
553    values -- values that are not used by the operation but whose types
554    "testify" to their applicability.  On the implementation side, "convert"
555    is simply a projection (returning its second curried argument).  With
556    cross-module inlining, it should not result in any machine code being
557    generated.
558    
559    ----------------------------------------------------------------------
560    Name: Matthias Blume
561    Date: 2002/03/15 16:40:00 EST
562    Tag: blume-20020315-basis
563    Description:
564    
565    Provided (preliminary?) implementations for
566    
567      {String,Substring}.{concatWith,isSuffix,isSubstring}
568    
569    and
570    
571      Substring.full
572    
573    Those are in the Basis spec but they were missing in SML/NJ.
574    
575    ----------------------------------------------------------------------
576    Name: Matthias Blume
577    Date: 2002/03/14 21:30:00 EST
578    Tag: blume-20020314-controls
579    Description:
580    
581    Controls:
582    ---------
583    
584    1. Factored out the recently-added Controls : CONTROLS stuff and put
585       it into its own library $/controls-lib.cm.  The source tree for
586       this is under src/smlnj-lib/Controls.
587    
588    2. Changed the names of types and functions in this interface, so they
589       make a bit more "sense":
590    
591          module -> registry
592          'a registry -> 'a group
593    
594    3. The interface now deals in ref cells only.  The getter/setter interface
595       is (mostly) gone.
596    
597    4. Added a function that lets one register an already-existing ref cell.
598    
599    5. Made the corresponding modifications to the rest of the code so that
600       everything compiles again.
601    
602    6. Changed the implementation of Controls.MLRISC back to something closer
603       to the original.  In particular, this module (and therefore MLRISC)
604       does not depend on Controls.  There now is some link-time code in
605       int-sys.sml that registers the MLRISC controls with the Controls
606       module.
607    
608    CM:
609    ---
610    
611      * One can now specify the lambda-split aggressiveness in init.cmi.
612    
613    ----------------------------------------------------------------------
614    Name: Allen Leung
615    Date: 2002/03/13 17:30:00 EST
616    Tag: leunga-20020313-x86-fp-unary
617    Description:
618    
619    Bug fix for:
620    
621    > leunga@weaselbane:~/Yale/tmp/sml-dist{21} bin/sml
622    > Standard ML of New Jersey v110.39.1 [FLINT v1.5], March 08, 2002
623    > - fun f(x,(y,z)) = Real.~ y;
624    > [autoloading]
625    > [autoloading done]
626    >       fchsl   (%eax), 184(%esp)
627    > Error: MLRisc bug: X86MCEmitter.emitInstr
628    >
629    > uncaught exception Error
630    >   raised at: ../MLRISC/control/mlriscErrormsg.sml:16.14-16.19
631    
632    The problem was that the code generator did not generate any fp registers
633    in this case, and the ra didn't know that it needed to run the X86FP phase to
634    translate the pseudo fp instruction.   This only happened with unary fp
635    operators in certain situations.
636    
637    ----------------------------------------------------------------------
638    Name: Matthias Blume
639    Date: 2002/03/13 14:00:00 EST
640    Tag: blume-20020313-overload-etc
641    Description:
642    
643    1. Added _overload as a synonym for overload for backward compatibility.
644       (Control.overloadKW must be true for either version to be accepted.)
645    
646    2. Fixed bug in install script that caused more things to be installed
647       than what was requested in config/targets.
648    
649    3. Made CM aware of the (_)overload construct so that autoloading
650       works.
651    
652    ----------------------------------------------------------------------
653    Name: Matthias Blume
654    Date: 2002/03/12 22:03:00 EST
655    Tag: blume-20020312-url
656    Description:
657    
658    Forgot to update BOOT and srcarchiveurl.
659    
660    ----------------------------------------------------------------------
661    Name: Matthias Blume
662    Date: 2002/03/12 17:30:00 EST
663    Tag: blume-20020312-version110392
664    Description:
665    
666    Yet another version number bump (because of small changes to the
667    binfile format).  Version number is now 110.39.2.  NEW BOOTFILES!
668    
669    Changes:
670    
671      The new pid generation scheme described a few weeks ago was overly
672      complicated.  I implemented a new mechanism that is simpler and
673      provides a bit more "stability":  Once CM has seen a compilation
674      unit, it keeps its identity constant (as long as you do not delete
675      those crucial CM/GUID/* files).  This means that when you change
676      an interface, compile, then go back to the old interface, and
677      compile again, you arrive at the original pid.
678    
679      There now also is a mechanism that instructs CM to use the plain
680      environment hash as a module's pid (effectively making its GUID
681      the empty string).  For this, "noguid" must be specified as an
682      option to the .sml file in question within its .cm file.
683      This is most useful for code that is being generated by tools such
684      as ml-nlffigen (because during development programmers tend to
685      erase the tool's entire output directory tree including CM's cached
686      GUIDs).  "noguid" is somewhat dangerous (since it can be used to locally
687      revert to the old, broken behavior of SML/NJ, but in specific cases
688      where there is no danger of interface confusion, its use is ok
689      (I think).
690    
691      ml-nlffigen by default generates "noguid" annotations.  They can be
692      turned off by specifying -guid in its command line.
693    
694    ----------------------------------------------------------------------
695    Name: Lal George
696    Date: 2002/03/12 12 14:42:36 EST
697    Tag: george-20020312-frequency-computation
698    Description:
699    
700    Integrated jump chaining and static block frequency into the
701    compiler. More details and numbers later.
702    
703    ----------------------------------------------------------------------
704    Name: Lal George
705    Date: 2002/03/11 11 22:38:53 EST
706    Tag: george-20020311-jump-chain-elim
707    Description:
708    
709    Tested the jump chain elimination on all architectures (except the
710    hppa).  This is on by default right now and is profitable for the
711    alpha and x86, however, it may not be profitable for the sparc and ppc
712    when compiling the compiler.
713    
714    The gc test will typically jump to a label at the end of the cluster,
715    where there is another jump to an external cluster containing the actual
716    code to invoke gc. This is to allow factoring of common gc invocation
717    sequences. That is to say, we generate:
718    
719            f:
720               testgc
721               ja   L1      % jump if above to L1
722    
723            L1:
724               jmp L2
725    
726    
727    After jump chain elimination the 'ja L1' instructions is converted to
728    'ja L2'. On the sparc and ppc, many of the 'ja L2' instructions may end
729    up being implemented in their long form (if L2 is far away) using:
730    
731            jbe     L3      % jump if below or equal to L3
732            jmp     L2
733         L3:
734            ...
735    
736    
737    For large compilation units L2  may be far away.
738    
739    
740    ----------------------------------------------------------------------
741    Name: Matthias Blume
742    Date: 2002/03/11 13:30:00 EST
743    Tag: blume-20020311-mltreeeval
744    Description:
745    
746    A functor parameter was missing.
747    
748    ----------------------------------------------------------------------
749    Name: Allen Leung
750    Date: 2002/03/11 10:30:00 EST
751    Tag: leunga-20020311-runtime-string0
752    Description:
753    
754       The representation of the empty string now points to a
755    legal null terminated C string instead of unit.  It is now possible
756    to convert an ML string into C string with InlineT.CharVector.getData.
757    This compiles into one single machine instruction.
758    
759    ----------------------------------------------------------------------
760    Name: Allen Leung
761    Date: 2002/03/10 23:55:00 EST
762    Tag: leunga-20020310-x86-call
763    Description:
764    
765       Added machine generation for CALL instruction (relative displacement mode)
766    
767    ----------------------------------------------------------------------
768    Name: Matthias Blume
769    Date: 2002/03/08 16:05:00
770    Tag: blume-20020308-entrypoints
771    Description:
772    
773    Version number bumped to 110.39.1.  NEW BOOTFILES!
774    
775    Entrypoints: non-zero offset into a code object where execution should begin.
776    
777    - Added the notion of an entrypoint to CodeObj.
778    - Added reading/writing of entrypoint info to Binfile.
779    - Made runtime system bootloader aware of entrypoints.
780    - Use the address of the label of the first function given to mlriscGen
781      as the entrypoint.  This address is currently always 0, but it will
782      not be 0 once we turn on block placement.
783    - Removed the linkage cluster code (which was The Other Way(tm) of dealing
784      with entry points) from mlriscGen.
785    
786    ----------------------------------------------------------------------
787    Name: Allen Leung
788    Date: 2002/03/07 20:45:00 EST
789    Tag: leunga-20020307-x86-cmov
790    Description:
791    
792       Bug fixes for CMOVcc on x86.
793    
794       1. Added machine code generation for CMOVcc
795       2. CMOVcc is now generated in preference over SETcc on PentiumPro or above.
796       3. CMOVcc cannot have an immediate operand as argument.
797    
798    ----------------------------------------------------------------------
799    Name: Matthias Blume
800    Date: 2002/03/07 16:15:00 EST
801    Tag: blume-20020307-controls
802    Description:
803    
804    This is a very large but mostly boring patch which makes (almost)
805    every tuneable compiler knob (i.e., pretty much everything under
806    Control.* plus a few other things) configurable via both the command
807    line and environment variables in the style CM did its configuration
808    until now.
809    
810    Try starting sml with '-h' (or, if you are brave, '-H')
811    
812    To this end, I added a structure Controls : CONTROLS to smlnj-lib.cm which
813    implements the underlying generic mechanism.
814    
815    The interface to some of the existing such facilities has changed somewhat.
816    For example, the MLRiscControl module now provides mkFoo instead of getFoo.
817    (The getFoo interface is still there for backward-compatibility, but its
818    use is deprecated.)
819    
820    The ml-build script passes -Cxxx=yyy command-line arguments through so
821    that one can now twiddle the compiler settings when using this "batch"
822    compiler.
823    
824    TODO items:
825    
826    We should go through and throw out all controls that are no longer
827    connected to anything.  Moreover, we should go through and provide
828    meaningful (and correct!) documentation strings for those controls
829    that still are connected.
830    
831    Currently, multiple calls to Controls.new are accepted (only the first
832    has any effect).  Eventually we should make sure that every control
833    is being made (via Controls.new) exactly once.  Future access can then
834    be done using Controls.acc.
835    
836    Finally, it would probably be a good idea to use the getter-setter
837    interface to controls rather than ref cells.  For the time being, both
838    styles are provided by the Controls module, but getter-setter pairs are
839    better if thread-safety is of any concern because they can be wrapped.
840    
841    *****************************************
842    
843    One bug fix: The function blockPlacement in three of the MLRISC
844    backpatch files used to be hard-wired to one of two possibilities at
845    link time (according to the value of the placementFlag).  But (I
846    think) it should rather sense the flag every time.
847    
848    *****************************************
849    
850    Other assorted changes (by other people who did not supply a HISTORY entry):
851    
852    1. the cross-module inliner now works much better (Monnier)
853    2. representation of weights, frequencies, and probabilities in MLRISC
854       changed in preparation of using those for weighted block placement
855       (Reppy, George)
856    
857    ----------------------------------------------------------------------
858    Name: Lal George
859    Date: 2002/03/07 14:44:24 EST 2002
860    Tag: george-20020307-weighted-block-placement
861    
862    Tested the weighted block placement optimization on all architectures
863    (except the hppa) using AMPL to generate the block and edge frequencies.
864    Changes were required in the machine properties to correctly
865    categorize trap instructions. There is an MLRISC flag
866    "weighted-block-placement" that can be used to enable weighted block
867    placement, but this will be ineffective without block/edge
868    frequencies (coming soon).
869    
870    
871    ----------------------------------------------------------------------
872    Name: Lal George
873    Date: 2002/03/05 17:24:48 EST
874    Tag: george-20020305-linkage-cluster
875    
876    In order to support the block placement optimization, a new cluster
877    is generated as the very first cluster (called the linkage cluster).
878    It contains a single jump to the 'real' entry point for the compilation
879    unit. Block placement has no effect on the linkage cluster itself, but
880    all the other clusters  have full freedom in the manner in which they
881    reorder blocks or functions.
882    
883    On the x86 the typical linkage code that is generated is:
884       ----------------------
885            .align 2
886       L0:
887            addl    $L1-L0, 72(%esp)
888            jmp     L1
889    
890    
891            .align  2
892       L1:
893       ----------------------
894    
895    72(%esp) is the memory location for the stdlink register. This
896    must contain the address of the CPS function being called. In the
897    above example, it contains the address of  L0; before
898    calling L1 (the real entry point for the compilation unit), it
899    must contain the address for L1, and hence
900    
901            addl $L1-L0, 72(%esp)
902    
903    I have tested this on all architectures except the hppa.The increase
904    in code size is of course negligible
905    
906    ----------------------------------------------------------------------
907    Name: Allen Leung
908    Date: 2002/03/03 13:20:00 EST
909    Tag: leunga-20020303-mlrisc-tools
910    
911      Added #[ ... ] expressions to mlrisc tools
912    
913    ----------------------------------------------------------------------
914    Name: Matthias Blume
915    Date: 2002/02/27 12:29:00 EST
916    Tag: blume-20020227-cdebug
917    Description:
918    
919    - made types in structure C and C_Debug to be equal
920    - got rid of code duplication (c-int.sml vs. c-int-debug.sml)
921    - there no longer is a C_Int_Debug (C_Debug is directly derived from C)
922    
923    ----------------------------------------------------------------------
924    Name: Matthias Blume
925    Date: 2002/02/26 12:00:00 EST
926    Tag: blume-20020226-ffi
927    Description:
928    
929    1. Fixed a minor bug in CM's "noweb" tool:
930       If numbering is turned off, then truly don't number (i.e., do not
931       supply the -L option to noweb).  The previous behavior was to supply
932       -L'' -- which caused noweb to use the "default" line numbering scheme.
933       Thanks to Chris Richards for pointing this out (and supplying the fix).
934    
935    2. Once again, I reworked some aspects of the FFI:
936    
937       A. The incomplete/complete type business:
938    
939       - Signatures POINTER_TO_INCOMPLETE_TYPE and accompanying functors are
940         gone!
941       - ML types representing an incomplete type are now *equal* to
942         ML types representing their corresponding complete types (just like
943         in C).  This is still safe because ml-nlffigen will not generate
944         RTTI for incomplete types, nor will it generate functions that
945         require access to such RTTI.   But when ML code generated from both
946         incomplete and complete versions of the C type meet, the ML types
947         are trivially interoperable.
948    
949         NOTE:  These changes restore the full generality of the translation
950         (which was previously lost when I eliminated functorization)!
951    
952       B. Enum types:
953    
954       - Structure C now has a type constructor "enum" that is similar to
955         how the "su" constructor works.  However, "enum" is not a phantom
956         type because each "T enum" has values (and is isomorphic to
957         MLRep.Signed.int).
958       - There are generic access operations for enum objects (using
959         MLRep.Signed.int).
960       - ml-nlffigen will generate a structure E_foo for each "enum foo".
961         * The structure contains the definition of type "mlrep" (the ML-side
962         representation type of the enum).  Normally, mlrep is the same
963         as "MLRep.Signed.int", but if ml-nlffigen was invoked with "-ec",
964         then mlrep will be defined as a datatype -- thus facilitating
965         pattern matching on mlrep values.
966         ("-ec" will be suppressed if there are duplicate values in an
967          enumeration.)
968         * Constructors ("-ec") or values (no "-ec") e_xxx of type mlrep
969         will be generated for each C enum constant xxx.
970         * Conversion functions m2i and i2m convert between mlrep and
971         MLRep.Signed.int.  (Without "-ec", these functions are identities.)
972         * Coversion functions c and ml convert between mlrep and "tag enum".
973         * Access functions (get/set) fetch and store mlrep values.
974       - By default (unless ml-nlffigen was invoked with "-nocollect"), unnamed
975         enumerations are merged into one single enumeration represented by
976         structure E_'.
977    
978    ----------------------------------------------------------------------
979    Name: Allen Leung
980    Date: 2002/02/25 04:45:00 EST
981    Tag: leunga-20020225-cps-spill
982    
983    This is a new implementation of the CPS spill phase.
984    The new phase is in the new file compiler/CodeGen/cpscompile/spill-new.sml
985    In case of problems, replace it with the old file spill.sml
986    
987    The current compiler runs into some serious performance problems when
988    constructing a large record.  This can happen when we try to compile a
989    structure with many items.  Even a very simple structure like the following
990    makes the compiler slow down.
991    
992        structure Foo = struct
993           val x_1 = 0w1 : Word32.int
994           val x_2 = 0w2 : Word32.int
995           val x_3 = 0w3 : Word32.int
996           ...
997           val x_N = 0wN : Word32.int
998        end
999    
1000    The following table shows the compile time, from N=1000 to N=4000,
1001    with the old compiler:
1002    
1003    N
1004    1000   CPS 100 spill                           0.04u  0.00s  0.00g
1005           MLRISC ra                               0.06u  0.00s  0.05g
1006              (spills = 0 reloads = 0)
1007           TOTAL                                   0.63u  0.07s  0.21g
1008    
1009    1100   CPS 100 spill                           8.25u  0.32s  0.64g
1010           MLRISC ra                               5.68u  0.59s  3.93g
1011              (spills = 0 reloads = 0)
1012           TOTAL                                   14.71u  0.99s  4.81g
1013    
1014    1500   CPS 100 spill                           58.55u  2.34s  1.74g
1015           MLRISC ra                               5.54u  0.65s  3.91g
1016              (spills = 543 reloads = 1082)
1017           TOTAL                                   65.40u  3.13s  6.00g
1018    
1019    2000   CPS 100 spill                           126.69u  4.84s  3.08g
1020           MLRISC ra                               0.80u  0.10s  0.55g
1021              (spills = 42 reloads = 84)
1022           TOTAL                                   129.42u  5.10s  4.13g
1023    
1024    3000   CPS 100 spill                           675.59u  19.03s  11.64g
1025           MLRISC ra                               2.69u  0.27s  1.38g
1026              (spills = 62 reloads = 124)
1027           TOTAL                                   682.48u  19.61s  13.99g
1028    
1029    4000   CPS 100 spill                           2362.82u  56.28s  43.60g
1030           MLRISC ra                               4.96u  0.27s  2.72g
1031              (spills = 85 reloads = 170)
1032           TOTAL                                   2375.26u  57.21s  48.00g
1033    
1034    As you can see the old cps spill module suffers from some serious
1035    performance problem.  But since I cannot decipher the old code fully,
1036    instead of patching the problems up, I'm reimplementing it
1037    with a different algorithm.  The new code is more modular,
1038    smaller when compiled, and substantially faster
1039    (O(n log n) time and O(n) space).  Timing of the new spill module:
1040    
1041    4000  CPS 100 spill                           0.02u  0.00s  0.00g
1042          MLRISC ra                               0.25u  0.02s  0.15g
1043             (spills=1 reloads=3)
1044          TOTAL                                   7.74u  0.34s  1.62g
1045    
1046    Implementation details:
1047    
1048    As far as I can tell, the purpose of the CPS spill module is to make sure the
1049    number of live variables at any program point (the bandwidth)
1050    does not exceed a certain limit, which is determined by the
1051    size of the spill area.
1052    
1053    When the bandwidth is too large, we decrease the register pressure by
1054    packing live variables into spill records.  How we achieve this is
1055    completely different than what we did in the old code.
1056    
1057    First, there is something about the MLRiscGen code generator
1058    that we should be aware of:
1059    
1060    o MLRiscGen performs code motion!
1061    
1062       In particular, it will move floating point computations and
1063       address computations involving only the heap pointer to
1064       their use sites (if there is only a single use).
1065       What this means is that if we have a CPS record construction
1066       statement
1067    
1068           RECORD(k,vl,w,e)
1069    
1070       we should never count the new record address w as live if w
1071       has only one use (which is often the case).
1072    
1073       We should do something similar to floating point, but the transformation
1074       there is much more complex, so I won't deal with that.
1075    
1076    Secondly, there are now two new cps primops at our disposal:
1077    
1078     1. rawrecord of record_kind option
1079        This pure operator allocates some uninitialized storage from the heap.
1080        There are two forms:
1081    
1082         rawrecord NONE [INT n]  allocates a tagless record of length n
1083         rawrecord (SOME rk) [INT n] allocates a tagged record of length n
1084                                     and initializes the tag.
1085    
1086     2. rawupdate of cty
1087          rawupdate cty (v,i,x)
1088          Assigns to x to the ith component of record v.
1089          The storelist is not updated.
1090    
1091    We use these new primops for both spilling and increment record construction.
1092    
1093     1. Spilling.
1094    
1095        This is implemented with a linear scan algorithm (but generalized
1096        to trees).  The algorithm will create a single spill record at the
1097        beginning of the cps function and use rawupdate to spill to it,
1098        and SELECT or SELp to reload from it.  So both spills and reloads
1099        are fine-grain operations.  In contrast, in the old algorithm
1100        "spills" have to be bundled together in records.
1101    
1102        Ideally, we should sink the spill record construction to where
1103        it is needed.  We can even split the spill record into multiple ones
1104        at the places where they are needed.  But CPS is not a good
1105        representation for global code motion, so I'll keep it simple and
1106        am not attempting this.
1107    
1108     2. Incremental record construction (aka record splitting).
1109    
1110        Long records with many component values which are simulatenously live
1111        (recall that single use record addresses are not considered to
1112         be live) are constructed with rawrecord and rawupdate.
1113        We allocate space on the heap with rawrecord first, then gradually
1114        fill it in with rawupdate.  This is the technique suggested to me
1115        by Matthias.
1116    
1117        Some restrictions on when this is applicable:
1118        1. It is not a VECTOR record.  The code generator currently does not handle
1119           this case. VECTOR record uses double indirection like arrays.
1120        2. All the record component values are defined in the same "basic block"
1121           as the record constructor.  This is to prevent speculative
1122           record construction.
1123    
1124    ----------------------------------------------------------------------
1125    Name: Allen Leung
1126    Date: 2002/02/22 01:02:00 EST
1127    Tag: leunga-20020222-mlrisc-tools
1128    
1129    Minor bug fixes in the parser and rewriter
1130    
1131    ----------------------------------------------------------------------
1132    Name: Allen Leung
1133    Date: 2002/02/21 20:20:00 EST
1134    Tag: leunga-20020221-peephole
1135    
1136    Regenerated the peephole files.  Some contained typos in the specification
1137    and some didn't compile because of pretty printing bugs in the old version
1138    of 'nowhere'.
1139    
1140    ----------------------------------------------------------------------
1141    Name: Allen Leung
1142    Date: 2002/02/19 20:20:00 EST
1143    Tag: leunga-20020219-mlrisc-tools
1144    Description:
1145    
1146       Minor bug fixes to the mlrisc-tools library:
1147    
1148       1.  Fixed up parsing colon suffixed keywords
1149       2.  Added the ability to shut the error messages up
1150       3.  Reimplemented the pretty printer and fixed up/improved
1151           the pretty printing of handle and -> types.
1152       4.  Fixed up generation of literal symbols in the nowhere tool.
1153       5.  Added some SML keywords to to sml.sty
1154    
1155    ----------------------------------------------------------------------
1156    Name: Matthias Blume
1157    Date: 2002/02/19 16:20:00 EST
1158    Tag: blume-20020219-cmffi
1159    Description:
1160    
1161    A wild mix of changes, some minor, some major:
1162    
1163    * All C FFI-related libraries are now anchored under $c:
1164        $/c.cm      --> $c/c.cm
1165        $/c-int.cm  --> $c/internals/c-int.cm
1166        $/memory.cm --> $c/memory/memory.cm
1167    
1168    * "make" tool (in CM) now treats its argument pathname slightly
1169      differently:
1170        1. If the native expansion is an absolute name, then before invoking
1171           the "make" command on it, CM will apply OS.Path.mkRelative
1172           (with relativeTo = OS.FileSys.getDir()) to it.
1173        2. The argument will be passed through to subsequent phases of CM
1174           processing without "going native".  In particular, if the argument
1175           was an anchored path, then "make" will not lose track of that anchor.
1176    
1177    * Compiler backends now "know" their respective C calling conventions
1178      instead of having to be told about it by ml-nlffigen.  This relieves
1179      ml-nlffigen from one of its burdens.
1180    
1181    * The X86Backend has been split into X86CCallBackend and X86StdCallBackend.
1182    
1183    * Export C_DEBUG and C_Debug from $c/c.cm.
1184    
1185    * C type encoding in ml-nlffi-lib has been improved to model the conceptual
1186      subtyping relationship between incomplete pointers and their complete
1187      counterparts.  For this, ('t, 'c) ptr has been changed to 'o ptr --
1188      with the convention of instantiating 'o with ('t, 'c) obj whenever
1189      the pointer target type is complete.  In the incomplete case, 'o
1190      will be instantiated with some "'c iobj" -- a type obtained by
1191      using one of the functors PointerToIncompleteType or PointerToCompleteType.
1192    
1193      Operations that work on both incomplete and complete pointer types are
1194      typed as taking an 'o ptr while operations that require the target to
1195      be known are typed as taking some ('t, 'c) obj ptr.
1196    
1197      voidptr is now a bit "more concrete", namely "type voidptr = void ptr'"
1198      where void is an eqtype without any values.  This makes it possible
1199      to work on voidptr values using functions meant to operate on light
1200      incomplete pointers.
1201    
1202    * As a result of the above, signature POINTER_TO_INCOMPLETE_TYPE has
1203      been vastly simplified.
1204    
1205    ----------------------------------------------------------------------
1206    Name: Matthias Blume
1207    Date: 2002/02/19 10:48:00 EST
1208    Tag: blume-20020219-pqfix
1209    Description:
1210    
1211    Applied Chris Okasaki's bug fix for priority queues.
1212    
1213    ----------------------------------------------------------------------
1214    Name: Matthias Blume
1215    Date: 2002/02/15 17:05:00
1216    Tag: Release_110_39
1217    Description:
1218    
1219    Last-minute retagging is becoming a tradition... :-(
1220    
1221    This is the working release 110.39.
1222    
1223    ----------------------------------------------------------------------
1224    Name: Matthias Blume
1225    Date: 2002/02/15 16:00:00 EST
1226    Tag: Release_110_39-orig
1227    Description:
1228    
1229    Working release 110.39.  New bootfiles.
1230    
1231    (Update: There was a small bug in the installer so it wouldn't work
1232    with all shells.  So I retagged. -Matthias)
1233    
1234    ----------------------------------------------------------------------
1235    Name: Matthias Blume
1236    Date: 2002/02/15 14:17:00 EST
1237    Tag: blume-20020215-showbindings
1238    Description:
1239    
1240    Added EnvRef.listBoundSymbols and CM.State.showBindings.  Especially
1241    the latter can be useful for exploring what bindings are available at
1242    the interactive prompt.  (The first function returns only the list
1243    of symbols that are really bound, the second prints those but also the
1244    ones that CM's autoloading mechanism knows about.)
1245    
1246    ----------------------------------------------------------------------
1247    Name: Matthias Blume
1248    Date: 2002/02/15 12:08:00 EST
1249    Tag: blume-20020215-iptrs
1250    Description:
1251    
1252    Two improvements to ml-nlffigen:
1253    
1254      1. Write files only if they do not exist or if their current contents
1255         do not coincide with what's being written.  (That is, avoid messing
1256         with the time stamps unless absolutely necessary.)
1257    
1258      2. Implement a "repository" mechanism for generated files related
1259         to "incomplete pointer types".   See the README file for details.
1260    
1261    ----------------------------------------------------------------------
1262    Name: Matthias Blume
1263    Date: 2002/02/14 11:50:00 EST
1264    Tag: blume-20020214-quote
1265    Description:
1266    
1267    Added a type 't t_' to tag.sml (in ml-nlffi-lib.cm).  This is required
1268    because of the new and improved tag generation scheme.  (Thanks to Allen
1269    Leung for pointing it out.)
1270    
1271    ----------------------------------------------------------------------
1272    Name: Lal George
1273    Date: 2002/02/14 09:55:27 EST 2002
1274    Tag: george-20020214-isabelle-bug
1275    Description:
1276    
1277    Fixed the MLRISC bug sent by Markus Wenzel regarding the compilation
1278    of Isabelle on the x86.
1279    
1280    From Allen:
1281    -----------
1282     I've found the problem:
1283    
1284         in ra-core.sml, I use the counter "blocked" to keep track of the
1285         true number of elements in the freeze queue.  When the counter goes
1286         to zero, I skip examining the queue.  But I've messed up the
1287         bookkeeping in combine():
1288    
1289             else ();
1290             case !ucol of
1291               PSEUDO => (if !cntv > 0 then
1292                     (if !cntu > 0 then blocked := !blocked - 1 else ();
1293                                        ^^^^^^^^^^^^^^^^^^^^^^^
1294                      moveu := mergeMoveList(!movev, !moveu)
1295                     )
1296                  else ();
1297    
1298         combine() is called to coalesce two nodes u and v.
1299         I think I was thinking that if the move counts of u and v are both
1300         greater than zero then after they are coalesced then one node is
1301         removed from the freeze queue.  Apparently I was thinking that
1302         both u and v are of low degree, but that's clearly not necessarily true.
1303    
1304    
1305    02/12/2002:
1306        Here's the patch.  HOL now compiles.
1307    
1308        I don't know how this impact on performance (compile
1309        time or runtime).  This bug caused the RA (especially on the x86)
1310        to go thru the potential spill phase when there are still nodes on the
1311        freeze queue.
1312    
1313    
1314    
1315    
1316    ----------------------------------------------------------------------
1317    Name: Matthias Blume
1318    Date: 2002/02/13 22:40:00 EST
1319    Tag: blume-20020213-fptr-rtti
1320    Description:
1321    
1322    Fixed a bug in ml-nlffigen that was introduced with one of the previous
1323    updates.
1324    
1325    ----------------------------------------------------------------------
1326    Name: Matthias Blume
1327    Date: 2002/02/13 16:41:00 EST
1328    Tag: blume-20020213-cmlpq
1329    Description:
1330    
1331    Added new priority queue export symbols (which have just been added to
1332    smlnj-lib.cm) to CML's version of smlnj-lib.cm.  (Otherwise CML would
1333    not compile and the installer would choke.)
1334    
1335    ----------------------------------------------------------------------
1336    Name: Matthias Blume
1337    Date: 2002/02/13 16:15:00 EST
1338    Tag: blume-20020213-various
1339    Description:
1340    
1341    1. More tweaks to ml-nlffigen:
1342    
1343       - better internal datastructures (resulting in slight speedup)
1344       - "-match" option requires exact match
1345       - "localized" gensym counters (untagged structs/unions nested within
1346         other structs/unions or within typedefs get a fresh counter; their
1347         tag will be prefixed by a concatenation of their parents' tags)
1348       - bug fixes (related to calculation of transitive closure of types
1349         to be included in the output)
1350    
1351    2. Minor Basis updates:
1352    
1353       - added implementations for List.collate and Option.app
1354    
1355    ----------------------------------------------------------------------
1356    Name: Matthias Blume
1357    Date: 2002/02/11 15:55:00 EST
1358    Tag: blume-20020211-gensym
1359    Description:
1360    
1361    Added a "-gensym" option to command line of ml-nlffigen.  This can be
1362    used to specify a "stem" -- a string that is inserted in all "gensym'd"
1363    names (ML structure names that correspond to unnamed C structs, unions,
1364    and enums), so that separate runs of ml-nlffigen do not clash.
1365    
1366    ----------------------------------------------------------------------
1367    Name: Matthias Blume
1368    Date: 2002/02/11 12:05:00 EST
1369    Tag: blume-20020211-gensml
1370    Description:
1371    
1372    A quick fix for a problem with GenSML (in the pgraph-util library):
1373    Make generation of toplevel "local" optional.  (Strictly speaking,
1374    signature definitions within "local" are not legal SML.)
1375    
1376    Other than that: updates to INSTALL and cm/TODO.
1377    
1378    ----------------------------------------------------------------------
1379    Name: Matthias Blume
1380    Date: 2002/02/08 15:00:00 EST
1381    Tag: blume-20020208-uniquepid
1382    Description:
1383    
1384    0. Version number has been bumped to 110.38.1.  NEW BOOTFILES!!!
1385    
1386    1. The installer (config/install.sh) has gotten smarter:
1387    
1388         - Configuration options are a bit easier to specify now
1389           (in config/targets).
1390         - Bug in recognizing .tar.bz2 files fixed.
1391         - Installer automatically resolves dependencies between
1392           configuration options (e.g., if you ask for eXene, you will
1393           also get cml -- regardless whether you asked for it or not).
1394         - Installer can run in "quieter mode" by setting the environment
1395           variable INSTALL_QUIETLY to "true".  "Quieter" does not mean
1396           "completely silent", though.
1397         - Build HashCons library as part of smlnj-lib.
1398    
1399    2. A new scheme for assigning persistent identifiers to compilation
1400       units (and, by extension, to types etc.) has been put into place.
1401       This fixes a long-standing bug where types and even dynamic values
1402       can get internally confused, thereby compromising type safety
1403       (abstraction) and dynamic correctness.  See
1404    
1405         http://cm.bell-labs.com/cm/cs/who/blume/pid-confusion.tgz
1406    
1407       for an example of how things could go wrong until now.
1408    
1409       The downside of the new scheme is that pids are not quite as
1410       persistent as they used to be: CM will generate a fresh pid
1411       for every compilation unit that it thinks it sees for the first
1412       time.  That means that if you compile starting from a clean, fresh
1413       source tree at two different times, you end up with different
1414       binaries.
1415    
1416       Cutoff recompilation, however, has not been compromised because
1417       CM keeps pid information in special caches between runs.
1418    
1419    ----------------------------------------------------------------------
1420    Name: Lal George
1421    Date: 2002/02/07 15:34:13 EST 2002
1422    Tag: <none>
1423    Description:
1424    
1425    Compilers that generate assembly code may produce  global labels
1426    whose value is resolved at link time. The various peephole optimization
1427    modules did not take this in account.
1428    
1429    TODO. The Labels.addrOf function should really return an option
1430    type so that clients are forced to deal with this issue, rather
1431    than an exception being raised.
1432    
1433    ----------------------------------------------------------------------
1434    Name: Lal George
1435    Date: 2002/02/06 13:55:02 EST
1436    Tag: george-20020206-ra-breakup
1437    Description:
1438    
1439    1. A bug fix from Allen.
1440    
1441        A typo causes extra fstp %st(0)'s to be generated at compensation
1442        edges, which might cause stack underflow traps at runtime.  This
1443        occurs in fft where there are extraneous fstps right before the 'into'
1444        trap instruction (in this case they are harmless since none of the
1445        integers overflow.)
1446    
1447    2. Pulled out various utility modules that were embedded in the modules
1448       of the register allocator. I need these modules for other purposes, but
1449       they are not complete enough to put into a library (just yet).
1450    ----------------------------------------------------------------------
1451    Name: Matthias Blume
1452    Date: 2002/01/31 16:05:00 EST
1453    Tag: blume-20020131-sparc-ccalls
1454    Description:
1455    
1456    1. C-calls on Sparc needlessly allocated a huge chunk (96 bytes)
1457       of extra stack space by mistake.  Fixed.
1458    
1459    2. Bug in logic of handling of command-line options in ml-nlffigen fixed.
1460    
1461    ----------------------------------------------------------------------
1462    Name: Allen Leung
1463    Date: 2002/01/30
1464    Tag: leunga-20020130-nowhere-bug-fix
1465    Description:
1466    
1467       MLRISC bug fixes:
1468       1. Fixed a bindings computation bug in the 'nowhere' program generator tool.
1469       2. MachineInt.fromString was negating its value.
1470    
1471    ----------------------------------------------------------------------
1472    Name: Matthias Blume
1473    Date: 2002/01/29
1474    Tag: blume-20020129-INSTALL
1475    Description:
1476    
1477    - Added somewhat detailed installation instructions (file INSTALL).
1478    - Fixed curl-detection bug in config/install.sh.
1479    - It is now possible to select the URL getter using the URLGETTER
1480      environment variable:
1481    
1482          not set / "unknown"      --> automatic detection (script tries wget,
1483                                       curl, and lynx)
1484          "wget" / "curl" / "lynx" --> use the specified program (script "knows"
1485                                       how to properly invoke them)
1486          other                    --> use $URLGETTER directly, it must take
1487                                       precisely two command-line arguments
1488                                       (source URL and destination file name)
1489    
1490    ----------------------------------------------------------------------
1491    Name: Matthias Blume
1492    Date: 2002/01/28
1493    Tag: blume-20020128-sparc-ccalls
1494    Description:
1495    
1496    - Fixed problem with calculation of "used" registers in sparc-c-calls.
1497    - Make use of the allocParam argument in sparc-c-calls.
1498    
1499    ----------------------------------------------------------------------
1500    Name: Matthias Blume
1501    Date: 2002/01/28
1502    Tag: blume-20020128-allocParam
1503    Description:
1504    
1505    John Reppy:  Changes c-calls API to accept client-callback for
1506    allocating extra stack space.
1507    me: Corresponding changes to mlriscGen (using a dummy argument that
1508        does not change the current behavior).
1509    
1510    ----------------------------------------------------------------------
1511    Name: Matthias Blume
1512    Date: 2002/01/28 12:00:00
1513    Tag: Release_110_38
1514    Description:
1515    
1516    This time for real!!!
1517    
1518    ----------------------------------------------------------------------
1519    Name: Matthias Blume
1520    Date: 2002/01/28 10:56:00 EST
1521    Tag: blume-20020128-retraction
1522    Description:
1523    
1524    0. Retracted earlier 110.38.  (The Release_110_38 tag has been replaced
1525       with blume-Release_110_38-retracted.)
1526    
1527    1. Fixed a problem with incorrect rounding modes in real64.sml.
1528       (Thanks to Andrew Mccreight <andrew.mccreight@yale.edu>.)
1529    
1530    2. A bug in ml-nlffigen related to the handling of unnamed structs, unions,
1531       and enums fixed.  The naming of corresponding ML identifiers should
1532       now be consistent again.
1533    
1534    ----------------------------------------------------------------------
1535    Name: Allen Leung
1536    Date: 2002/01/27
1537    Tag: leunga-20020127-nowhere
1538    Description:
1539    
1540       Added a target called nowhere in the configuration scripts.
1541       Enabling this will build the MLRISC 'nowhere' tool (for translating
1542       programs with where-clauses into legal SML code) during installation.
1543    
1544    ----------------------------------------------------------------------
1545    Name: Matthias Blume
1546    Date: 2002/01/25 21:27:00 EST
1547    Tag: blume-Release_110_38-retracted
1548    Description:
1549    
1550    Call it a (working) release!  Version is 110.38. Bootfiles are ready.
1551    
1552    README will be added later.
1553    
1554    !!! NOTE:  Re-tagged as blume-Release_110_38-retracted. Original tag
1555    (Release_110_38) removed.  Reason: Last-minute bug fixes.
1556    
1557    ----------------------------------------------------------------------
1558    Name: Matthias Blume
1559    Date: 2002/01/25
1560    Tag: blume-20020125-ffi
1561    Description:
1562    
1563    A large number of tweaks and improvements to ml-nlffi-lib and
1564    ml-nlffigen:
1565    
1566       - ML represenation types have been streamlined
1567       - getter and setter functions work with concrete values, not abstract
1568         ones where possible
1569       - ml-nlffigen command line more flexible (see README file there)
1570       - some bugs have been fixed (hopefully)
1571    
1572    ----------------------------------------------------------------------
1573    Name: Lal George
1574    Date: 2002/01/24
1575    Tag: george-20020124-risc-ra-interface
1576    Description:
1577    
1578       There is a dramatic simplification in the interface to the
1579       register allocator for RISC architectures as a result of making
1580       parallel copy instructions explicit.
1581    
1582    ----------------------------------------------------------------------
1583    Name: Matthias Blume
1584    Date: 2002/01/22
1585    Tag: blume-20020122-x86-ccalls
1586    Description:
1587    
1588    Bug fix for c-calls on x86 (having to do with how char- and
1589    short-arguments are being handled).
1590    
1591    ----------------------------------------------------------------------
1592    Name: Matthias Blume
1593    Date: 2002/01/21
1594    Tag: blume-20020121-ff
1595    Description:
1596    
1597    Another day of fiddling with the FFI...
1598    
1599    1. Bug fix/workaround:  CKIT does not complain about negative array
1600       dimensions, so ml-nlffigen has to guard itself against this possibility.
1601       (Otherwise a negative dimension would send it into an infinite loop.)
1602    
1603    2. Some of the abstract types (light objects, light pointers, most "base"
1604       types) in structure C are now eqtypes.
1605    
1606    3. Added constructors and test functions for NULL function pointers.
1607    
1608    ----------------------------------------------------------------------
1609    Name: Matthias Blume
1610    Date: 2002/01/18
1611    Tag: blume-20020118-ready-for-new-release
1612    Description:
1613    
1614    Made config/srcarchiveurl point to a new place.  (Will provide boot
1615    files shortly.)
1616    
1617    Maybe we christen this to be 110.38?
1618    
1619    ----------------------------------------------------------------------
1620    Name: Matthias Blume
1621    Date: 2002/01/18
1622    Tag: blume-20020118-more-ffifiddle
1623    Description:
1624    
1625    Today's FFI fiddling:
1626    
1627      - Provided a structure CGetSet with "convenient" versions of C.Get.* and
1628        C.Set.* that use concrete (MLRep.*) arguments and results instead
1629        of abstract ones.
1630    
1631      - Provided word-style bit operations etc. for "int" representation
1632        types in MLRep.S<Foo>Bitops where <Foo> ranges over Char, Int, Short,
1633        and Long.
1634    
1635    ----------------------------------------------------------------------
1636    Name: Matthias Blume
1637    Date: 2002/01/18
1638    Tag: blume-20020118-use-x86-fp
1639    Description:
1640    
1641    Now that x86-fast-fp seems to be working, I turned it back on again
1642    by default.  (Seems to work fine now, even with the FFI.)
1643    
1644    Other than that, I added some documentation about the FFI to
1645    src/ml-nlffigen/README and updated the FFI test examples in
1646    src/ml-nlffi-lib/Tests/*.
1647    
1648    ----------------------------------------------------------------------
1649    Name: Allen Leung
1650    Date: 2002/01/17
1651    Tag: leunga-20020117-x86-fast-fp-call
1652    Description:
1653    
1654       1. Fixed a problem with handling return fp values when x86's fast fp
1655          mode is turned on.
1656    
1657       2. Minor pretty printing fix for cellset.  Print %st(0) as %st(0) instead
1658          of %f32.
1659    
1660       3. Added a constructor INT32lit to the ast of MLRISC tools.
1661    
1662    ----------------------------------------------------------------------
1663    Name: Matthias Blume
1664    Date: 2002/01/16
1665    Tag: blume-20020116-ffifiddle
1666    Description:
1667    
1668    More fiddling with the FFI interface:
1669    
1670     - Make constness 'c instead of rw wherever possible.  This eliminates
1671       the need for certain explicit coercions.  (However, due to ML's
1672       value polymorphism, there will still be many cases where explicit
1673       coercions are necessary.  Phantom types are not the whole answer
1674       to modeling a subtyping relationship in ML.)
1675    
1676     - ro/rw coersions for pointers added.  (Avoids the detour through */&.)
1677    
1678     - "printf" test example added to src/ml-nlffi-lib/Tests.  (Demonstrates
1679       clumsy workaround for varargs problem.)
1680    
1681    ----------------------------------------------------------------------
1682    Name: Lal George
1683    Date: 2002/01/15
1684    Tag: <none>
1685    Description:
1686    
1687    1. Since COPY instructions are no longer native to the architecture,
1688       a generic functor can be used to implement the expandCopies function.
1689    
1690    2. Allowed EXPORT and IMPORT pseudo-op declarations to appear inside a
1691       TEXT segment.
1692    
1693    ----------------------------------------------------------------------
1694    Name: Matthias Blume
1695    Date: 2002/01/15
1696    Tag: blume-20020115-ffiupdates
1697    Description:
1698    
1699    1. Fix for bug resulting in single-precision float values being returned
1700       incorrectly from FFI calls.
1701    
1702    2. Small modifications to C FFI API:
1703    
1704        - memory-allocation routines return straight objects (no options)
1705          and raise an exception in out-of-memory situations
1706        - unsafe extensions to cast between function pointers and pointers
1707          from/to ints
1708        - added structure C_Debug as an alternative to structure C where
1709          pointer-dereferencing (|*| and |*!) always check for null-pointers
1710        - added open_lib' to DynLinkage;  open_lib' works like open_lib
1711          but also takes a (possibly empty) list of existing library handles
1712          that the current library depends on
1713    
1714    ----------------------------------------------------------------------
1715    Name: Matthias Blume
1716    Date: 2002/01/10
1717    Tag: blume-20020110-newffigen
1718    Description:
1719    
1720    1. Updates to portable graph code.
1721    
1722    2. Major update to ml-nlffigen and ml-nlffi-lib.  Things are much
1723       more scalable now so that even huge interfaces such as the one
1724       for GTK compile in finite time and space. :-)
1725       See src/ml-nlffigen/README for details on what's new.
1726    
1727    ----------------------------------------------------------------------
1728    Name: Lal George
1729    Date: 2001/01/09 14:31:35 EST 2002
1730    Tag: george-20011206-rm-native-copy
1731    Description:
1732    
1733            Removed the native COPY and FCOPY instructions
1734            from all the architectures and replaced it with the
1735            explicit COPY instruction from the previous commit.
1736    
1737            It is now possible to simplify many of the optimizations
1738            modules that manipulate copies. This has not been
1739            done in this change.
1740    
1741    ----------------------------------------------------------------------
1742    Name: Lal George
1743    Date: 2001/12/06 16:50:13 EST 2001
1744    Tag: george-20011206-mlrisc-instruction
1745    Description:
1746    
1747    Changed the representation of instructions from being fully abstract
1748    to being partially concrete. That is to say:
1749    
1750      from
1751            type instruction
1752    
1753      to
1754            type instr                              (* machine instruction *)
1755    
1756            datatype instruction =
1757                LIVE of {regs: C.cellset, spilled: C.cellset}
1758              | KILL of {regs: C.cellset, spilled: C.cellset}
1759              | COPYXXX of {k: CB.cellkind, dst: CB.cell list, src: CB.cell list}
1760              | ANNOTATION of {i: instruction, a: Annotations.annotation}
1761              | INSTR of instr
1762    
1763    This makes the handling of certain special instructions that appear on
1764    all architectures easier and uniform.
1765    
1766    LIVE and KILL say that a list of registers are live or killed at the
1767    program point where they appear. No spill code is generated when an
1768    element of the 'regs' field is spilled, but the register is moved to
1769    the 'spilled' (which is present, more for debugging than anything else).
1770    
1771    LIVE replaces the (now deprecated) DEFFREG instruction on the alpha.
1772    We used to generate:
1773    
1774            DEFFREG f1
1775            f1 := f2 + f3
1776            trapb
1777    
1778    but now generate:
1779    
1780            f1 := f2 + f3
1781            trapb
1782            LIVE {regs=[f1,f2,f3], spilled=[]}
1783    
1784    Furthermore, the DEFFREG (hack) required that all floating point instruction
1785    use all registers mentioned in the instruction. Therefore f1 := f2 + f3,
1786    defines f1 and uses [f1,f2,f3]! This hack is no longer required resulting
1787    in a cleaner alpha implementation. (Hopefully, intel will not get rid of
1788    this architecture).
1789    
1790    COPYXXX is intended to replace the parallel COPY and FCOPY  available on
1791    all the architectures. This will result in further simplification of the
1792    register allocator that must be aware of them for coalescing purposes, and
1793    will also simplify certain aspects of the machine description that provides
1794    callbacks related to parallel copies.
1795    
1796    ANNOTATION should be obvious, and now INSTR represents the honest to God
1797    machine instruction set!
1798    
1799    The <arch>/instructions/<arch>Instr.sml files define certain utility
1800    functions for making porting easier -- essentially converting upper case
1801    to lower case. All machine instructions (of type instr) are in upper case,
1802    and the lower case form generates an MLRISC instruction. For example on
1803    the alpha we have:
1804    
1805      datatype instr =
1806         LDA of {r:cell, b:cell, d:operand}
1807       | ...
1808    
1809      val lda : {r:cell, b:cell, d:operand} -> instruction
1810        ...
1811    
1812    where lda is just (INSTR o LDA), etc.
1813    
1814    ----------------------------------------------------------------------
1815    Name: Matthias Blume
1816    Date: 2001/11/22 21:40:00 EST
1817    Tag: Release_110_37
1818    Description:
1819    
1820    Release 110.37.  This time for real.
1821    
1822    ----------------------------------------------------------------------
1823    Name: Matthias Blume
1824    Date: 2001/11/21 16:35:00 EST
1825    Tag: blume-20011121-foot-in-mouth
1826    Description:
1827    
1828    Removed the "Release_110_37" tag because of a serious bug.
1829    This will be re-tagged once the bug is fixed.
1830    
1831    ----------------------------------------------------------------------
1832    Name: Matthias Blume
1833    Date: 2001/11/21 16:14:00 EST
1834    Tag: blume-20011121-forgottenfile
1835    Description:
1836    
1837    Forgot to add a file.  (Just a .tex-file -- part of
1838    the CM manual source.)
1839    
1840    ----------------------------------------------------------------------
1841    Name: Matthias Blume
1842    Date: 2001/11/21 16:10:00 EST
1843    Tag: blume-20011121-invalid_110_37
1844    Description:
1845    
1846    Note: I removed the original tag "Release_110_37" from this commit
1847          because we found a serious bug in all non-x86 backends.
1848          - Matthias
1849    
1850    1. Modifications to the SML/NJ code generator and to the runtime system
1851       so that code object name strings are directly inserted into code
1852       objects at code generation time.  The only business the runtime system
1853       has with this is now to read the name strings on occasions.
1854       (The encoding of the name string has also changed somewhat.)
1855    
1856    2. CM now implements a simple "set calculus" for specifying export lists.
1857       In particular, it is now possible to refer to the export lists of
1858       other libraries/groups/sources and form unions as well as differences.
1859       See the latest CM manual for details.
1860    
1861    3. An separate notion of "proxy" libraries has again be eliminated from
1862       CM's model.  (Proxy libraries are now simply a special case of using
1863       the export list calculus.)
1864    
1865    4. Some of the existing libraries now take advantage of the new set
1866       calculus.
1867       (Notice that not all libraries have been converted because some
1868       of the existing .cm-files are supposed to be backward compatible
1869       with 110.0.x.)
1870    
1871    5. Some cleanup in stand-alone programs.  (Don't use "exnMessage" -- use
1872       "General.exnMessage"!  The former relies on a certain hook to be
1873       initialized, and that often does not happen in the stand-alone case.)
1874    
1875    ----------------------------------------------------------------------
1876    Name: Lal George
1877    Date: 2001/11/21  13:56:18 EST
1878    Tag: george-2001121-pseudo-ops
1879    Description:
1880    
1881      Implemented a complete redesign of MLRISC pseudo-ops. Now there
1882      ought to never be any question of incompatabilities with
1883      pseudo-op syntax expected by host assemblers.
1884    
1885      For now, only modules supporting GAS syntax are implemented
1886      but more should follow, such as MASM, and vendor assembler
1887      syntax, e.g. IBM as, Sun as, etc.
1888    
1889    ----------------------------------------------------------------------
1890    Name: Matthias Blume
1891    Date: 2001/11/14 11:52:00 EST
1892    Tag: blume-20011114-srcname
1893    Description:
1894    
1895    1. Routed the name of the current source file to mlriscgen where it
1896       should be directly emitted into the code object.  (This last part
1897       is yet to be done.)
1898    
1899    2. Some cleanup of the pgraph code to make it match the proposal that
1900       I put out the other day.  (The proposal notwithstanding, things are
1901       still in flux here.)
1902    
1903    ----------------------------------------------------------------------
1904    Name: Lal George
1905    Date: 2001/11/14 09:44:04 EST
1906    Tag:
1907    Description:
1908    
1909      Fix for a backpatching bug reported by Allen.
1910    
1911      Because the boundary between short and long span-dependent
1912      instructions is +/- 128, there are an astounding number of
1913      span-dependent instructions whose size is over estimated.
1914    
1915      Allen came up with the idea of letting the size of span
1916      dependent instructions be non-monotonic, for a maxIter
1917      number of times, after which the size must be monotonically
1918      increasing.
1919    
1920      This table shows the number of span-dependent instructions
1921      whose size was over-estimated as a function of maxIter, for the
1922      file Parse/parse/ml.grm.sml:
1923    
1924         maxIter            # of instructions:
1925            10                      687
1926            20                      438
1927            30                      198
1928            40                        0
1929    
1930      In compiling the compiler, there is no significant difference in
1931      compilation speed between maxIter=10 and maxIter=40. Actually,
1932      my measurements showed that maxIter=40 was a tad faster than
1933      maxIter=10! Also 96% of the  files in the compiler reach a fix
1934      point within 13 iterations, so fixing maxIter at 40, while high,
1935      is okay.
1936    
1937    ----------------------------------------------------------------------
1938    Name: Matthias Blume
1939    Date: 2001/10/31 15:25:00 EST
1940    Tag: blume-20011031-pgraph
1941    Description:
1942    
1943    CKIT:
1944    * Changed the "Function" constructor of type Ast.ctype to carry optional
1945      argument identifiers.
1946    * Changed the return type of TypeUtil.getFunction accordingly.
1947    * Type equality ignores the argument names.
1948    * TypeUtil.composite tries to preserve argument names but gives up quickly
1949      if there is a mismatch.
1950    
1951    installation script:
1952    * attempts to use "curl" if available (unless "wget" is available as well)
1953    
1954    CM:
1955    * has an experimental implementation of "portable graphs" which I will
1956      soon propose as an implementation-independent library format
1957    * there are also new libraries $/pgraph.cm and $/pgraph-util.cm
1958    
1959    NLFFI-LIB:
1960    * some cleanup (all cosmetic)
1961    
1962    NLFFIGEN:
1963    * temporarily disabled the mechanism that suppresses ML output for
1964      C definitions whose identifiers start with an underscore character
1965    * generate val bindings for enum constants
1966    * user can request that only one style (light or heavy) is being used;
1967      default is to use both (command-line arguments: -heavy and -light)
1968    * fixed bug in handling of function types involving incomplete pointers
1969    * generate ML entry points that take record arguments (i.e., using
1970      named arguments) for C functions that have a prototype with named
1971      arguments
1972      (see changes to CKIT)
1973    
1974    ----------------------------------------------------------------------
1975    Name: Allen Leung
1976    Date: 2001/10/27 20:34:00 EDT
1977    Tag: leunga-20011027-x86-fast-fp-call
1978    Description:
1979    
1980       Fixed the bug described in blume-20010920-slowfp.
1981    
1982       The fix involves
1983          1. generating FCOPYs in FSTP in ia32-svid
1984          2. marking a CALL with the appropriate annotation
1985    
1986    ----------------------------------------------------------------------
1987    Name: Matthias Blume
1988    Date: 2001/10/16 11:32:00 EDT
1989    Tag: blume-20011016-netbsd
1990    Description:
1991    
1992    Underscore patch from Chris Richards (fixing problem with compiling
1993    runtime system under recent NetBSD).
1994    
1995    ----------------------------------------------------------------------
1996    Name: Allen Leung
1997    Date: 2001/10/12 17:18:32 EDT 2001
1998    Tag: leung-20011012-x86-printflowgraph
1999    Description:
2000    
2001    X86RA now uses a valid (instead of dummy) PrintFlowgraph module.
2002    
2003    ----------------------------------------------------------------------
2004    Name: Lal George
2005    Date: 2001/10/11 23:51:34 EDT
2006    Tag: george-20011011-too-many-instrs
2007    Description:
2008    
2009    The representation of a program point never expected to see more
2010    than 65536 instructions in a basic block!
2011    
2012    ----------------------------------------------------------------------
2013    Name: Lal George
2014    Date: 2001/10/09 09:41:37 EDT
2015    Tag: george-20011008-mlrisc-labels
2016    Description:
2017    
2018    Changed the machine description files to support printing of
2019    local and global labels in assembly code, based on host assembler
2020    conventions.
2021    
2022    ----------------------------------------------------------------------
2023    Name: Matthias Blume
2024    Date: 2001/09/25 15:25:00 EDT
2025    Tag: blume-20010925-exninfo
2026    Description:
2027    
2028    I provided a non-hook implementation of exnName (at the toplevel) and
2029    made the "dummy" implementation of exnMessage (at the toplevel) more
2030    useful: if nothing gets "hooked in", then at least you are going to
2031    see the exception name and a message indicating why you don't see more.
2032    
2033    [For the time being, programs that need exnMessage and want to use
2034    ml-build should either use General.exnMessage (strongly recommended) or
2035    refer to structure General at some other point so that CM sees a
2036    static dependency.]
2037    
2038    [Similar remarks go for "print" and "use":  If you want to use their
2039    functionality in stand-alone programs generated by ml-build, then use
2040    TextIO.output and Backend.Interact.useFile (from $smlnj/compiler.cm).]
2041    
2042    ----------------------------------------------------------------------
2043    Name: Matthias Blume
2044    Date: 2001/09/20 17:28:00 EDT
2045    Tag: blume-20010920-slowfp
2046    Description:
2047    
2048    Allen says that x86-fast-fp is not safe yet, so I turned it off again...
2049    
2050    ----------------------------------------------------------------------
2051    Name: Matthias Blume
2052    Date: 2001/09/20 17:20:00 EDT
2053    Tag: blume-20010920-canonicalpaths
2054    Description:
2055    
2056    0. Updated the BOOT file (something that I forgot to do earlier).
2057    
2058    1. Small internal change to CM so that it avoids "/../" in filenames
2059       as much as possible (but only where it is safe).
2060    
2061    2. Changed config/_run-sml (resulting in a changed bin/.run-sml) so
2062       that arguments that contain delimiters are passed through correctly.
2063       This change also means that all "special" arguments of the form
2064       @SMLxxx... must come first.
2065    
2066    3. Changed install script to put relative anchor names for tool commands
2067       into pathconfig.
2068    
2069    ----------------------------------------------------------------------
2070    Name: Matthias Blume
2071    Date: 2001/09/18 15:35:00 EDT
2072    Tag: blume-20010918-readme11036
2073    Description:
2074    
2075    Added README files.
2076    
2077    ----------------------------------------------------------------------
2078    Name: Matthias Blume
2079    Date: 2001/09/18 11:45:00 EDT
2080    Tag: Release_110_36 (retag)
2081    Description:
2082    
2083    Fixed mistake in config/preloads. Retagged as 110.36.
2084    
2085    ----------------------------------------------------------------------
2086    Name: Matthias Blume
2087    Date: 2001/09/18 09:40:00 EDT
2088    Tag: Release_110_36_orig (tag changed)
2089    Description:
2090    
2091    New version (110.36).  New bootfiles.
2092    
2093    ----------------------------------------------------------------------
2094    Name: Matthias Blume
2095    Date: 2001/09/14 16:15:00 EDT
2096    Tag: blume-20010914-x86fastfp
2097    Description:
2098    
2099    John committed some changes that Allen made, in particular a (hopefully)
2100    correctly working version of the x86-fp module.
2101    
2102    I changed the default setting of the Control.MLRISC.getFlag "x86-fast-fp"
2103    flag to "true".  Everything seems to compile to a fixpoint ok, and
2104    "mandelbrot" speeds up by about 15%.
2105    
2106    ----------------------------------------------------------------------
2107    Name: Matthias Blume
2108    Date: 2001/09/13 11:20:00 EDT
2109    Tag: blume-20010913-minimal
2110    Description:
2111    
2112    1. Stefan Monnier's patch to fix a miscompilation problem that
2113       was brought to light by John Reppy's work on Moby.
2114    
2115    2. Implemented a minimal "structure Compiler" that contains just
2116       "version" and "architecture".  The minimal version will be
2117       available when the full version is not.  This is for backward-
2118       compatibility with code that wants to test Compiler.version.
2119    
2120    ----------------------------------------------------------------------
2121    Name: Matthias Blume
2122    Date: 2001/08/28 14:03:00 EDT
2123    Tag: blume-20010828-ml-lex
2124    Description:
2125    
2126    Fix for bug 1581, received from Neophytos Michael.
2127    
2128    ----------------------------------------------------------------------
2129    Name: Matthias Blume
2130    Date: 2001/08/27 11:20:00 EDT
2131    Tag: blume-20010827-readme11035
2132    Description:
2133    
2134    Fleshed out the README file for 110.35.
2135    
2136    ----------------------------------------------------------------------
2137    Name: Matthias Blume
2138    Date: 2001/08/24 17:10:00 EDT
2139    Tag: Release_110_35
2140    Description:
2141    
2142    New version number (110.35).  New bootfiles.
2143    
2144    ----------------------------------------------------------------------
2145    Name: Lal George
2146    Date: 2001/08/24 13:47:18 EDT 2001
2147    Tag: george-20010824-MLRISC-graphs
2148    Description:
2149    
2150     removed clusters from MLRISC completely and replaced with graphs.
2151    
2152    ----------------------------------------------------------------------
2153    Name: Matthias Blume
2154    Date: 2001/08/23 17:50:00 EDT
2155    Tag: blume-20010823-toplevel
2156    Description:
2157    
2158    - some reorganization of the code that implements various kinds of
2159      environments in the compiler (static, dynamic, symbolic, combined)
2160    - re-implemented the EnvRef module so that evalStream works properly
2161      (if the stream contains references to "use", "CM.make", etc.)
2162    - cleaned up evalloop.sml and interact.sml (but they need more cleaning)
2163    
2164    ----------------------------------------------------------------------
2165    Name: Matthias Blume
2166    Date: 2001/08/20 15:50 EDT
2167    Tag: blume20010820-slipup
2168    Description:
2169    
2170    I forgot to commit a few files.  Here they are...
2171    
2172    ----------------------------------------------------------------------
2173    Name: Matthias Blume
2174    Date: 2001/08/20 15:35:00 EDT
2175    Tag: blume-20010820-debugprof
2176    Description:
2177    
2178    !!!! NEW BOOTFILES !!!!
2179    
2180    This is another round of reorganizing the compiler sources.  This
2181    time the main goal was to factor out all the "instrumentation"
2182    passes (for profiling and backtracing) into their own library.
2183    The difficulty was to do it in such a way that it does not depend
2184    on elaborate.cm but only on elabdata.cm.
2185    
2186    Therefore there have been further changes to both elaborate.cm and
2187    elabdata.cm -- more "generic" things have been moved from the former
2188    to the latter.  As a result, I was forced to split the assignment
2189    of numbers indicating "primtyc"s into two portions: SML-generic and
2190    SML/NJ-specific.  Since it would have been awkward to maintain,
2191    I bit the bullet and actually _changed_ the mapping between these
2192    numbers and primtycs.  The bottom line of this is that you need
2193    a new set of bin- and bootfiles.
2194    
2195    I have built new bootfiles for all architectures, so doing a fresh
2196    checkout and config/install.sh should be all you need.
2197    
2198    The newly created library's name is
2199    
2200        $smlnj/viscomp/debugprof.cm
2201    
2202    and its sources live under
2203    
2204        src/compiler/DebugProf
2205    
2206    ----------------------------------------------------------------------
2207    Name: Matthias Blume
2208    Date: 2001/08/15 17:15:00 EDT
2209    Tag: blume-20010815-compreorg
2210    Description:
2211    
2212    This is a first cut at reorganizing the CM libraries that make up the
2213    core of the compiler.  The idea is to separate out pieces that could
2214    be used independently by tools, e.g., the parser, the typechecker, etc.
2215    
2216    The current status is a step in this direction, but it is not quite
2217    satisfactory yet.  Expect more changes in the future.
2218    
2219    Here is the current (new) organization...
2220    
2221        What used to be $smlnj/viscomp/core.cm is now divided into
2222        six CM libraries:
2223    
2224             $smlnj/viscomp/basics.cm
2225                           /parser.cm
2226                           /elabdata.cm
2227                           /elaborate.cm
2228                           /execute.cm
2229                           /core.cm
2230    
2231        The CM files for these libraries live under src/system/smlnj/viscomp.
2232        All these libraries are proxy libraries that contain precisely
2233        one CM library component.  Here are the locations of the components
2234        (all within the src/compiler tree):
2235    
2236             Basics/basics.cm
2237             Parse/parser.cm
2238             ElabData/elabdata.cm
2239             Elaborator/elaborate.cm
2240             Execution/execute.cm
2241             core.cm
2242    
2243         [This organization is the same that has been used already
2244         for a while for the architecture-specific parts of the visible
2245         compiler and for the old version of core.cm.]
2246    
2247         As you will notice, many source files have been moved from their
2248         respective original locations to a new home in one of the above
2249         subtrees.
2250    
2251         The division of labor between the new libraries is the following:
2252    
2253             basics.cm:
2254                - Simple, basic definitions that pertain to many (or all) of
2255                  the other libraries.
2256             parser.cm:
2257                - The SML parser, producing output of type Ast.dec.
2258                - The type family for Ast is also defined and exported here.
2259             elabdata.cm:
2260                - The datatypes that describe input and output of the elaborator.
2261                  This includes types, absyn, and static environments.
2262             elaborator.cm:
2263                - The SML/NJ type checker and elaborator.
2264                  This maps an Ast.dec (with a given static environment) to
2265                  an Absyn.dec (with a new static environment).
2266                - This libraries implements certain modules that used to be
2267                  structures as functors (to remove dependencies on FLINT).
2268             execute.cm:
2269                - Everything having to do with executing binary code objects.
2270                - Dynamic environments.
2271             core.cm:
2272                - SML/NJ-specific instantiations of the elaborator and MLRISC.
2273                - Top-level modules.
2274                - FLINT (this should eventually become its own library)
2275    
2276    Notes:
2277    
2278    I am not 100% happy with the way I separated the elaborator (and its
2279    data structures) from FLINT.  Two instances of the same problem:
2280    
2281        1. Data structures contain certain fields that carry FLINT-specific
2282           information.  I hacked around this using exn and the property list
2283           module from smlnj-lib.  But the fact that there are middle-end
2284           specific fields around at all is a bit annoying.
2285    
2286        2. The elaborator calculates certain FLINT-related information.  I tried
2287           to make this as abstract as I could using functorization, but, again,
2288           the fact that the elaborator has to perform calculations on behalf
2289           of the middle-end at all is not nice.
2290    
2291        3. Having to used exn and property lists is unfortunate because it
2292           weakens type checking.  The other alternative (parameterizing
2293           nearly *everything*) is not appealing, though.
2294    
2295    I removed the "rebinding =" warning hack because due to the new organization
2296    it was awkward to maintain it.  As a result, the compiler now issues some of
2297    these warnings when compiling init.cmi during bootstrap compilation. On
2298    the plus side, you also get a warning when you do, for example:
2299       val op = = Int32.+
2300    which was not the case up to now.
2301    
2302    I placed "assign" and "deref" into the _Core structure so that the
2303    code that deals with the "lazy" keyword can find them there.  This
2304    removes the need for having access to the primitive environment
2305    during elaboration.
2306    
2307    ----------------------------------------------------------------------
2308    Name: Matthias Blume
2309    Date: 2001/08/13
2310    Tag: blume-20010813-closures
2311    Description:
2312    
2313    This fix was sent to us by Zhong Shao.  It is supposed to improve the
2314    performance of certain loops by avoiding needless closure allocation.
2315    
2316    ----------------------------------------------------------------------
2317    Name: Lal George
2318    Date: 2001/07/31 10:03:23 EDT 2001
2319    Tag: george-20010731-x86-fmalloc
2320    Description: Fixed bug in x86 calls
2321    
2322        There was a bug where call instructions would mysteriously
2323        vanish. The call instruction had to be one that returned
2324        a floating point value.
2325    
2326    ----------------------------------------------------------------------
2327    Name: Lal George
2328    Date: 2001/07/19 16:36:29 EDT 2001
2329    Tag: george-20010719-simple-cells
2330    Description:
2331    
2332    I have dramatically simplified the interface for CELLS in MLRISC.
2333    
2334    In summary, the cells interface is broken up into three parts:
2335    
2336      1. CellsBasis : CELLS_BASIS
2337    
2338            CellsBasis is a top level structure and common for all
2339            architectures.  it contains the definitions of basic datatypes
2340            and utility  functions over these types.
2341    
2342      2. functor Cells() : CELLS
2343    
2344            Cells generates an interface for CELLS that incorporates the
2345            specific resources on the target architecture, such as the
2346            presence of special register classes, their number and size,
2347            and various useful substructures.
2348    
2349      3. <ARCH>CELLS
2350    
2351            e.g. SparcCells: SPARCCELLS
2352    
2353            <ARCH>CELLS usually contains additional bindings for special
2354            registers  on the architecture, such as:
2355    
2356                    val r0 : cell           (* register zero *)
2357                    val y : cell            (* Y register *)
2358                    val psr : cell          (* processor status register *)
2359                    ...
2360    
2361            The structure returned by applying the Cells functor is opened
2362            in this interface.
2363    
2364    The main implication of all this is that the datatypes for cells is
2365    split between CellsBasis and CELLS -- a fairly simple change for user
2366    code.
2367    
2368    In the old scheme the CELLS interface had a definitional binding of
2369    the form:
2370    
2371            signature CELLS = sig
2372    
2373               structure CellsBasis = CellsBasis
2374    
2375               ...
2376    
2377            end
2378    
2379    With all the sharing constraints that goes on in MLRISC, this old
2380    design  quickly leads to errors such as:
2381    
2382            "structure definition spec inside of sharing ... "
2383    
2384    
2385    and appears to require an unacceptable amount of sharing and where
2386    constraint hackery.
2387    
2388    I think this error message (the interaction of definitional specs and
2389    sharing) requires more explanation on our web page.
2390    
2391    ----------------------------------------------------------------------
2392    Name: Matthias Blume
2393    Date: 2001/07/19 15:00:00 EDT
2394    Tag: blume-20010719-libreorg
2395    Description:
2396    
2397    This update puts together a fairly extensive but straightforward change
2398    to the way the libraries that implement the interactive system are
2399    organized:
2400    
2401       The biggest change is the elimination of structure Compiler.  As a
2402       replacement for this structure, there is now a CM library
2403       (known as $smlnj/compiler.cm or $smlnj/compiler/current.cm)
2404       that exports all the substructures of the original structure Compiler
2405       directly.  So instead of saying Compiler.Foo.bar one now simply
2406       says Foo.bar.  (The CM libraries actually export a collection of
2407       structures that is richer than the collection of substructures of
2408       structure Compiler.)
2409    
2410       To make the transition smooth, there is a separate library called
2411       $smlnj/compiler/compiler.cm which puts together and exports the
2412       original structure Compiler (or at least something very close to it).
2413    
2414       There are five members of the original structure Compiler
2415       that are not exported directly but which instead became members
2416       of a new structure Backend (described by signature BACKEND).  These are:
2417       structure Profile (: PROFILE), structure Compile (: COMPILE), structure
2418       Interact (: INTERACT), structure Machine (: MACHINE), and val
2419       architecture (: string).
2420    
2421       Structure Compiler.Version has become structure CompilerVersion.
2422    
2423       Cross-compilers for alpha32, hppa, ppc, sparc, and x86 are provided
2424       by $smlnj/compiler/<arch>.cm where <arch> is alpha32, hppa, ppc, sparc,
2425       or x86, respectively.
2426       Each of these exports the same frontend structures that
2427       $smlnj/compiler.cm exports.  But they do not have a structure Backend
2428       and instead export some structure <Arch>Backend where <Arch> is Alpha32,
2429       Hppa, PPC, Sparc, or X86, respectively.
2430    
2431       Library $smlnj/compiler/all.cm exports the union of the exports of
2432       $smlnj/compiler/<arch>.cm
2433    
2434       There are no structures <Arch>Compiler anymore, use
2435       $smlnj/compiler/<arch>.cm instead.
2436    
2437       Library host-compiler-0.cm is gone.  Instead, the internal library
2438       that instantiates CM is now called cm0.cm.  Selection of the host
2439       compiler (backend) is no longer done here but. (Responsibility for it
2440       now lies with $smlnj/compiler/current.cm.  This seems to be more
2441       logical.)
2442    
2443       Many individual files have been moved or renamed.  Some files have
2444       been split into multiple files, and some "dead" files have been deleted.
2445    
2446    Aside from these changes to library organization, there are also changes
2447    to the way the code itself is organized:
2448    
2449       Structure Binfile has been re-implemented in such a way that it no
2450       longer needs any knowledge of the compiler.  It exclusively deals
2451       with the details of binfile layout.  It no longer invokes the
2452       compiler (for the purpose of creating new prospective binfile
2453       content), and it no longer has any knowledge of how to interpret
2454       pickles.
2455    
2456       Structure Compile (: COMPILE) has been stripped down to the bare
2457       essentials of compilation.  It no longer deals with linking/execution.
2458       The interface has been cleaned up considerably.
2459    
2460       Utility routines for dealing with linking and execution have been
2461       moved into their own substructures.
2462    
2463       (The ultimate goal of these changes is to provide a light-weight
2464       binfile loader/linker (at least for, e.g., stable libraries) that
2465       does not require CM or the compiler to be present.)
2466    
2467    CM documentation has been updated to reflect the changes to library
2468    organization.
2469    
2470    ----------------------------------------------------------------------
2471    Name: Matthias Blume
2472    Date: 2001/07/10 17:30:00 EDT
2473    Tag: Release_110_34
2474    Description:
2475    
2476    Minor tweak to 110.34 (re-tagged):
2477    
2478      - README.html file added to CVS repository
2479      - runtime compiles properly under FreeBSD 3.X and 4.X
2480    
2481    ----------------------------------------------------------------------
2482    Name: Matthias Blume
2483    Date: 2001/07/10 17:30:00 EDT
2484    Tag: Release_110_34
2485    Description:
2486    
2487    New version number (110.34). New bootfiles.
2488    
2489    ----------------------------------------------------------------------
2490    Name: Matthias Blume
2491    Date: 2001/07/09 16:00:00 EDT
2492    Tag: blume-20010709-more-varargs
2493    Description:
2494    
2495    I changed the handling of varargs in ml-nlffigen again:
2496    The ellipsis ... will now simply be ignored (with an accompanying warning).
2497    
2498    The immediate effect is that you can actually call a varargs function
2499    from ML -- but you can't actually supply any arguments beyond the ones
2500    specified explicitly.  (For example, you can call printf with its format
2501    string, but you cannot pass additional arguments.)
2502    
2503    This behavior is only marginally more useful than the one before, but
2504    it has the advantage that a function or, more importantly, a function
2505    type never gets dropped on the floor, thus avoiding follow-up problems with
2506    other types that refer to the offending one.
2507    
2508    ----------------------------------------------------------------------
2509    Name: Matthias Blume
2510    Date: 2001/07/09 11:25:00 EDT
2511    Tag: blume-20010709-varargs
2512    Description:
2513    
2514    1. ckit-lib.cm now exports structure Error
2515    2. ml-nlffigen reports occurences of "..." (i.e., varargs function types)
2516       with a warning accompanied by a source location.  Moreover, it
2517       merely skips the offending function or type and proceeds with the
2518       rest of its work.u  As a result, one can safely feed C code containing
2519       "..." to ml-nlffigen.
2520    3. There are some internal improvements to CM, providing slightly
2521       more general string substitutions in the tools subsystem.
2522    
2523    ----------------------------------------------------------------------
2524    Name: Matthias Blume
2525    Date: 2001/06/27 15:10:00 EDT
2526    Tag: blume-20010627-concur
2527    Description:
2528    
2529    Fixed a small bug in CM's handling of parallel compilation.
2530    (You could observe the bug by Control-C-interrupting an ordinary
2531    CMB.make or CM.stabilize and then attaching some compile servers.
2532    The result was that all of a sudden the previously interrupted
2533    compilation would continue on its own.  This was because of
2534    an over-optimization: CM did not bother to clean out certain queues
2535    when no servers were attached "anyway", resulting in the contents
2536    of these queues to grab control when new servers did get attached.)
2537    
2538    There is also another minor update to the CM manual.
2539    
2540    ----------------------------------------------------------------------
2541    Name: Matthias Blume
2542    Date: 2001/06/26 16:15:00 EDT
2543    Tag: blume-20010626-cmdoc
2544    Description:
2545    
2546    Minor typo fixed in CM manual (syntax diagram for libraries).
2547    
2548    ----------------------------------------------------------------------
2549    Name: Matthias Blume
2550    Date: 2001/06/25 22:55:00 EDT
2551    Tag: blume-20010625-x86pc
2552    Description:
2553    
2554    Fixed a nasty bug in the X86 assembly code that caused signal
2555    handlers to fail (crash) randomly.
2556    
2557    ----------------------------------------------------------------------
2558    Name: Matthias Blume
2559    Date: 2001/06/25 12:05:00 EDT
2560    Tag: blume-20010625-nlffigen
2561    Description:
2562    
2563    This update fixes a number of minor bugs in ml-nlffigen as reported by
2564    Nick Carter <nbc@andrew.cmu.edu>.
2565    
2566      1. Silly but ok typedefs of the form "typedef void myvoid;" are now accepted.
2567      2. Default names for generated files are now derived from the name of
2568         the C file *without its directory*.  In particular, this causes generated
2569         files to be placed locally even if the C file is in some system directory.
2570      3. Default names for generated signatures and structures are also derived
2571         from the C file name without its directory.  This avoids silly things
2572         like "structure GL/GL".
2573         (Other silly names are still possible because ml-nlffigen does not do
2574          a thorough check of whether generated names are legal ML identifiers.
2575          When in doubt, use command line arguments to force particular names.)
2576    
2577    ----------------------------------------------------------------------
2578    Name: Matthias Blume
2579    Date: 2001/06/21 12:25:00 EDT
2580    Tag: blume-20010621-eXene
2581    Description:
2582    
2583    eXene now compiles and (sort of) works again.
2584    
2585    The library name (for version > 110.33) is $/eXene.cm.
2586    
2587    I also added an new example in src/eXene/examples/nbody.  See the
2588    README file there for details.
2589    
2590    ----------------------------------------------------------------------
2591    Name: Matthias Blume
2592    Date: 2001/06/20 16:40:00 EDT
2593    Tag: blume-20010620-cml
2594    Description:
2595    
2596    CML now compiles and works again.
2597    
2598    Libraries (for version > 110.33):
2599    
2600      $cml/cml.cm            Main CML library.
2601      $cml/basis.cm          CML's version of $/basis.cm.
2602      $cml/cml-internal.cm   Internal helper library.
2603      $cml/core-cml.cm       Internal helper library.
2604      $cml-lib/trace-cml.cm  Tracing facility.
2605      $cml-lib/smlnj-lib.cm  CML's version of $/smlnj-lib.cm
2606    
2607    The installer (config/install.sh) has been taught how to properly
2608    install this stuff.
2609    
2610    ----------------------------------------------------------------------
2611    Name: Matthias Blume
2612    Date: 2001/06/19 17:55:00 EDT
2613    Tag: blume-20010619-instantiate
2614    Description:
2615    
2616    This un-breaks the fix for bug 1432.
2617    (The bug was originally fixed in 110.9 but I broke it again some
2618    time after that.)
2619    
2620    ----------------------------------------------------------------------
2621    Name: Matthias Blume
2622    Date: 2001/06/19 17:25:00 EDT
2623    Tag: blume-20010619-signals
2624    Description:
2625    
2626    This should (hopefully) fix the long-standing signal handling bug.
2627    (The runtime system was constructing a continuation record with an
2628    incorrect descriptor which would cause the GC to drop data on the floor...)
2629    
2630    ----------------------------------------------------------------------
2631    Name: Matthias Blume
2632    Date: 2001/06/15 15:05:00 EDT
2633    Tag: blume-20010615-moresparc
2634    Description:
2635    
2636    Here is a short late-hour update related to Sparc c-calls:
2637    
2638     -- made handling of double-word arguments a bit smarter
2639    
2640     -- instruction selection phase tries to collapse certain clumsily
2641        constructed ML-Trees; typical example:
2642    
2643            ADD(ty,ADD(_,e,LI d1),LI d2)  ->  ADD(ty,e,LI(d1+d2))
2644    
2645        This currently has no further impact on SML/NJ since mlriscGen does
2646        not seem to generate such patterns in the first place, and c-calls
2647        (which did generate them in the beginning) has meanwhile been fixed
2648        so as to avoid them as well.
2649    
2650    ----------------------------------------------------------------------
2651    Name: Matthias Blume
2652    Date: 2001/06/15 15:05:00 EDT
2653    Tag: blume-20010615-sparc
2654    Description:
2655    
2656    The purpose of this update is to provide an implementation of NLFFI
2657    on Sparc machines.
2658    
2659    Here are the changes in detail:
2660    
2661       * src/MLRISC/sparc/c-calls/sparc-c-calls.sml is a new file containing
2662       the Sparc implementation of the c-calls API.
2663       * The Sparc backend of SML/NJ has been modified to uniformely use %fp
2664       for accessing the ML frame.  Thus, we have a real frame pointer and
2665       can freely modify %sp without need for an omit-frame-ptr phase.
2666       The vfp logic in src/compiler/CodeGen/* has been changed to accomodate
2667       this case.
2668       * ml-nlffigen has been taught to produce code for different architectures
2669       and calling conventions.
2670       * In a way similar to what was done in the x86 case, the Sparc
2671       backend uses its own specific extension to mltree.  (For example,
2672       it needs to be able to generate UNIMP instructions which are part
2673       of the calling convention.)
2674       * ml-nlffi-lib was reorganized to make it more modular (in particular,
2675       to make it easier to plug in new machine- and os-dependent parts).
2676    
2677    There are some other fairly unrelated bug fixes and cleanups as well:
2678    
2679       * I further hacked the .cm files for MLRISC tools (like MDLGen) so
2680       that they properly share their libraries with existing SML/NJ libraries.
2681       * I fixed a minor cosmetic bug in CM, supressing certain spurious
2682       follow-up error messages.
2683       * Updates to CM/CMB documentation.
2684    
2685    TODO items:
2686    
2687       * MLRISC should use a different register as its asmTemp on the Sparc.
2688         (The current %o2 is a really bad choice because it is part of the
2689         calling conventions, so things might interfere in unexpected ways.)
2690    
2691    ----------------------------------------------------------------------
2692    Name: Matthias Blume
2693    Date: 2001/06/07
2694    Tag: blume-20010607-calls
2695    Description:
2696    
2697    A number of internal changes related to C calls and calling conventions:
2698    
2699    1. ML-Tree CALL statements now carry a "pops" field.  It indicates the
2700       number of bytes popped implicitly (by the callee).  In most cases
2701       this field is 0 but on x86/win32 it is some non-zero value.  This
2702       is information provided for the benefit of the "omit-frameptr" pass.
2703    2. The CALL instruction on the x86 carries a similar "pops" field.
2704       The instruction selection phase copies its value from the ML-Tree
2705       CALL statement.
2706    3. On all other architectures, the instruction selection phase checks
2707       whether "pops=0" and complains if not.
2708    4. The c-calls implementation for x86 now accepts two calling conventions:
2709       "ccall" and "stdcall".  When "ccall" is selected, the caller cleans
2710       up after the call and pops is set to 0.  For "stdcall", the caller
2711       does nothing, leaving the cleanup to the callee; pops is set to
2712       the number of bytes that were pushed onto the stack.
2713    5. The cproto decoder (compiler/Semant/types/cproto.sml) now can
2714       distinguish between "ccall" and "stdcall".
2715    6. The UNIMP instruction has been added to the supported Sparc instruction
2716       set. (This is needed for implementing the official C calling convention
2717       on this architecture.)
2718    7. I fixed some of the .cm files under src/MLRISC/Tools to make them
2719       work with the latest CM.
2720    
2721    ----------------------------------------------------------------------
2722    Name: Matthias Blume
2723    Date: 2001/06/05 15:10:00 EDT
2724    Tag: blume-20010605-cm-index
2725    Description:
2726    
2727    0. The "lambdasplit" parameter for class "sml" in CM has been documented.
2728    
2729    1. CM can now generate "index files".  These are human-readable files
2730       that list on a per-.cm-file basis each toplevel symbol defined or
2731       imported.  The location of the index file for
2732       <p>/<d>.cm is <p>/CM/INDEX/<d>.cm.
2733       To enable index-file generation, set CM.Control.generate_index to true
2734       or export an environment-symbol: export CM_GENERATE_INDEX=true.
2735    
2736       The CM manual has been updated accordingly.
2737    
2738    2. I made some slight modifications to the c-calls API in MLRISC.
2739    
2740         a) There is now a callback to support saving/restoring of
2741            dedicated but caller-save registers around the actual call
2742            instruction.
2743         b) One can optionally specify a comment-annotation for the
2744            call instruction.
2745    
2746    3. SML/NJ (mlriscGen.sml) uses this new API for the rawccall primop.
2747       (For example, the comment annotation shows the C prototype of
2748        the function being called.)
2749    
2750    ----------------------------------------------------------------------
2751    Name: Matthias Blume
2752    Date: 2001/06/01 13:30:00 EDT
2753    Tag: blume-20010601-nlffi-cleanup
2754    Description:
2755    
2756    This is mostly a cleanup of MLFFI stuff:
2757    
2758       - some signature files have been put into a more exposed place
2759       - the ugly 'f type parameter is gone (simplifies types tremendously!)
2760       - ml-nlffigen changed accordingly
2761       - tutorial updated
2762    
2763    Other changes:
2764    
2765       - author's affiliation in CM manual(s) updated
2766       - some more recognized keywords added to Allen's sml.sty
2767    
2768    ----------------------------------------------------------------------
2769    Name: Matthias Blume
2770    Date: 2001/05/25 15:30:00 EDT
2771    Tag: blume-20010525-iptr
2772    Description:
2773    
2774      - put the official 110.33-README (as it appears on the ftp server) under
2775        CVS
2776      - fixed a small bug related to incomplete pointer types in
2777        ml-nlffigen
2778      - small cosmetic change to the ml-nlffi-lib's "arr" type constructor
2779        (it does not need the 'f type parameter)
2780    
2781    ----------------------------------------------------------------------
2782    Name: Matthias Blume
2783    Date: 2001/05/23 14:30:00 EDT
2784    Tag: Release_110_33
2785    Description:
2786    
2787    New version number (110.33).  New bootfiles.
2788    
2789    ----------------------------------------------------------------------
2790    Name: Matthias Blume
2791    Date: 2001/05/22 18:06:00 EDT
2792    Tag: blume-20010522-targets
2793    Description:
2794    
2795    Made install.sh use file config/targets.customized if it exists, falling
2796    back to config/targets if it doesn't.  This way one can have a customized
2797    version of the targets file without touching the "real thing", thus
2798    eliminating the constant fear of accidentally checking something bogus
2799    back into the CVS repository...  (File config/targets.customized must
2800    not be added to the repository!)
2801    
2802    ----------------------------------------------------------------------
2803    Name: Matthias Blume
2804    Date: 2001/05/22 16:30:00 EDT
2805    Tag: blume-20010522-minitut
2806    Description:
2807    
2808    1. Bug fix in ml-nlffigen; now (hopefully) correctly handling
2809       struct returns.
2810    2. Added src/ml-nlffi-lib/Doc/mini-tutorial.txt.  This is some very
2811       incomplete, preliminary documentation for NLFFI.
2812    
2813    ----------------------------------------------------------------------
2814    Name: Matthias Blume
2815    Date: 2001/05/14 11:30:00 EDT
2816    Tag: blume-20010514-script
2817    Description:
2818    
2819    Some bugs in install script fixed.
2820    
2821    In addition to that I also made a slight change to the NLFFI API:
2822    Functors generated by ml-nlffigen now take the dynamic library as a
2823    straight functor argument, not as a suspended one.  (The original
2824    functor code used to force the suspension right away anyway, so there
2825    was nothing gained by this complication of the interface.)
2826    
2827    ----------------------------------------------------------------------
2828    Name: Matthias Blume
2829    Date: 2001/05/11 14:35:00 EDT
2830    Tag: blume-20010511-ml-nlffi
2831    Description:
2832    
2833    I finally took the plunge and added my new FFI code to the main
2834    repository.  For x86-linux it is now ready for prime-time.
2835    
2836    There are two new subdirectories of "src":
2837    
2838      - ml-nlffi-lib:
2839           The utility library for programs using the FFI interface.
2840           Here is the implementation of $/c.cm and its associated low-level
2841           partners $/c-int.cm and $/memory.cm.
2842      - ml-nlffigen:
2843           A stand-alone program for generating ML glue code from C source
2844           code.
2845    
2846    Building ml-nlffigen requires $/ckit-lib.cm.
2847    
2848    The config/install.sh script has been updates to do the Right Thing
2849    (hopefully).
2850    
2851    Notice that the source tree for the C-Kit will not be put under "src"
2852    but directly under the installation root directory.  (This is the
2853    structure that currently exists on the CVS server when you check out
2854    module "sml".)  Fortunately, config/install.sh knows about this oddity.
2855    
2856    Bugs: No documentation yet.
2857    
2858    ----------------------------------------------------------------------
2859    Name: Matthias Blume
2860    Date: 2001/05/09 16:35:00 EDT
2861    Tag: blume-20010509-cpscontract
2862    Description:
2863    
2864    Fixed a bug in the accounting code in cpsopt/contract.sml.  (The
2865    wrapper/unwrapper elimination did not decrement usage counts and some
2866    dead variables got overlooked by the dead-up logic.)
2867    
2868    ----------------------------------------------------------------------
2869    Name: Lal George
2870    Date: 2001/05/08  17:26:09 EDT
2871    Tag: george-20010508-omit-frameptr
2872    Description:
2873    
2874    Changes to implement the omit-frame-pointer optimization to support
2875    raw C calls. For now, there is only support on the Intel x86, but
2876    other architectures will follow as more experience is gained with this.
2877    
2878    
2879    ----------------------------------------------------------------------
2880    Name: Matthias Blume
2881    Date: 2001/05/07 14:40:00 EDT
2882    Tag: blume-20010507-proxies
2883    Description:
2884    
2885    I made into "proxy libraries" all libraries that qualify for such a
2886    change.  (A qualifying library is a library that has another library or
2887    groups as its sole member and repeats that member's export list
2888    verbatim.  A proxy library avoids this repetition by omitting its export
2889    list, effectively inheriting the list that its (only) member exports.
2890    See the CM manual for more explanation.)
2891    The main effect is that explicit export lists for these libraries
2892    do not have to be kepts in sync, making maintenance a bit easier.
2893    
2894    I also added copyright notices to many .cm-files.
2895    
2896    Last but not least, I made a new set of bootfiles.
2897    
2898    ----------------------------------------------------------------------
2899    Name: Matthias Blume
2900    Date: 2001/05/04 17:00:00 EDT
2901    Tag: blume-20010504-cm-lsplit
2902    Description:
2903    
2904    0. John merged pending changes to $/smlnj-lib.cm
2905    
2906    1. Allen's previous change accidentally backed out of one of Lal's
2907       earlier changes.  I undid this mistake (re-introducing Lal's change).
2908    
2909    2. I used the new topOrder' function from graph-scc.sml (from $/smlnj-lib.cm)
2910       within the compiler where applicable.  There is some code simplification
2911       because of that.
2912    
2913    3. The "split" phase (in FLINT) is now part of the default list of phases.
2914       Compiler.Control.LambdaSplitting.* can be used to globally control the
2915       lambda-splitting (cross-module-inlining) engine.  In addition to that,
2916       it can now also be controlled on a per-source basis: CM has been taught
2917       a new tool parameter applicable to ML source files.
2918    
2919       - To turn lambda-splitting off completely:
2920            local open Compiler.Control.LambdaSplitting in
2921                val _ = set Off
2922            end
2923       - To make "no lambda-splitting" the global default (but allow per-source
2924         overriding); this is the initial setting:
2925            local open Compiler.Control.LambdaSplitting in
2926                val _ = set (Default NONE)
2927            end
2928       - To make "lambda-splitting with aggressiveness a" the global default
2929         (and allow per-source overriding):
2930            local open Compiler.Control.LambdaSplitting in
2931                val _ = set (Default (SOME a))
2932            end
2933    
2934       - To turn lambda-splitting off for a given ML souce file (say: a.sml)
2935         write (in the respective .cm-file):
2936            a.sml (lambdasplitting:off)
2937       - To turn lambda-splitting for a.sml on with minimal aggressiveness:
2938            a.sml (lambdasplitting:on)
2939       - To turn lambda-splitting for a.sml on with aggressiveness <a> (where
2940         <a> is a decimal non-negative integer):
2941            a.sml (lambdasplitting:<a>)
2942       - To turn lambda-splitting for a.sml on with maximal aggressiveness:
2943            a.sml (lambdasplitting:infinity)
2944       - To use the global default for a.sml:
2945            a.sml (lambdasplitting:default)
2946         or simply
2947            a.sml
2948    
2949    ----------------------------------------------------------------------
2950    Name: Allen Leung
2951    Date: 2001/05/04 01:57:00 EDT
2952    Tag: leunga-20010504-sync
2953    Description:
2954    
2955      MLRISC features.
2956    
2957      1. Fix to CMPXCHG instructions.
2958      2. Changed RA interface to allow annotations in callbacks.
2959      3. Added a new method to the stream interface to allow annotations updates.
2960    
2961    ----------------------------------------------------------------------
2962    Name: Matthias Blume
2963    Date: 2001/05/01 11:45:00 EDT
2964    Tag: blume-20010501-pcedittmp
2965    Description:
2966    
2967    Changed install.sh to use the current working directory instead of
2968    /usr/tmp for a temporary file (pcedittmp).  The previous choice
2969    of /usr/tmp caused trouble with MacOS X because of file premission
2970    problems.
2971    
2972    ----------------------------------------------------------------------
2973    Name: Matthias Blume
2974    Date: 2001/04/20 11:10:00 EDT
2975    Tag: blume-20010420-inMLflag
2976    Description:
2977    
2978     - added vp_limitPtrMask to vproc-state.h
2979       (for use by the raw-C-calls mechanism to implement proper interrupt
2980        handling)
2981     - made the ML compiler aware of various data-structure offsets so it
2982       can generate code for accessing the vp_inML flag and vp_limitPtrMask
2983     - tweaked mlriscGen.sml to have it emit interrupt-handling code for
2984       raw C-calls
2985    
2986    ----------------------------------------------------------------------
2987    Name: Lal George
2988    Date: 2001/04/20 09:15:28 EDT
2989    Tag: george-20010420-macosX
2990    Description:
2991    
2992     - Changes to port to Mac OS X; Darwin.
2993    
2994     - In the process I found that sqrt was broken on the PPC, because the
2995       fsqrt instruction is not implemented.
2996    
2997    ----------------------------------------------------------------------
2998    Name: Matthias Blume
2999    Date: 2001/04/18 12:45:00 EDT
3000    Tag: blume-20010418-ccalls
3001    Description:
3002    
3003     - fixed two off-by-4 errors in the x86-specific c-calls implementation
3004       (this bug prevented structure arguments containing pointers from being
3005        passed correctly)
3006     - changed the raw-C-call code in mlriscGen.sml in such a way that
3007       structure arguments are represented as a pointer to the beginning
3008       of the structure (instead of having a series of synthesized arguments,
3009       one for each structure member)
3010    
3011     - made makeml script's verbosity level configurable via environment
3012       variable (MAKEML_VERBOSITY)
3013    
3014     - eliminated placeholder implementations for f32l, w16s, i16s, and f32s
3015       in rawmem-x86.sml; we are now using the real thing
3016    
3017    ----------------------------------------------------------------------
3018    Name: Matthias Blume
3019    Date: 2001/03/22 16:25:00 EST
3020    Tag: blume-20010322-bootfiles
3021    Description:
3022    
3023    Created a new set of bootfiles (for your automatic installation convenience).
3024    
3025    ----------------------------------------------------------------------
3026    Name: Matthias Blume
3027    Date: 2001/03/22 15:10:00 EST
3028    Tag: blume-20010322-rawmem-parcm
3029    Description:
3030    
3031    1. All "raw memory access" primitives for the new FFI are implemented now
3032       (at least on the x86).
3033    2. Some further cleanup of CM's parallel make mechanism.
3034    
3035    ----------------------------------------------------------------------
3036    Name: Matthias Blume
3037    Date: 2001/03/19 17:53:00 EST
3038    Tag: blume-20010319-parallel
3039    Description:
3040    
3041    Parallel make (using compile servers) now works again.
3042    
3043    To this end, CM.stabilize and CMB.make have been modified to work in
3044    two passes when compile servers are attached:
3045       1. Compile everything, do not perform stabilization; this pass
3046          uses compile servers
3047       2. Stabilize everything; this pass does not use compile servers
3048    If there are no compile servers, the two passes are combined into one
3049    (as before).  Splitting the passes increases the inherent parallelism
3050    in the dependency graph because the entire graph including all
3051    libraries is available at the same time.  This, in turn, improves
3052    server utilization.  The downside is that the master process will
3053    have to do some extra work after compilation is done (because for
3054    technical reasons it must re-read all the binfiles during stabilization).
3055    
3056    ----------------------------------------------------------------------
3057    Name: Matthias Blume
3058    Date: 2001/03/16 12:22:00 EST
3059    Tag: blume-20010316-bootfiles
3060    Description:
3061    
3062    Created a new set of bootfiles (for your automatic installation convenience).
3063    
3064    ----------------------------------------------------------------------
3065    Name: Matthias Blume
3066    Date: 2001/03/16 11:00:00 EST
3067    Tag: blume-20010316-MLTREE-fixup
3068    Description:
3069    
3070    This is a minor fixup for an (untagged) earlier commit by Allen.
3071    (A file was missing).
3072    
3073    ----------------------------------------------------------------------
3074    Name: Allen Leung
3075    Date: Mon Mar  5 18:54:57 EST 2001
3076    Tag: leunga-20010305-cut-support
3077    
3078    1. New support for alternative control-flow in MLTREE.
3079       Currently we support
3080    
3081          FLOW_TO(CALL ...., [k1,...,kn])
3082    
3083       This is needed for 'cuts to' in C-- and try/handle-like constructs
3084       in Moby
3085    
3086       New assembler flag "asm-show-cutsto" to turn on control-flow debugging.
3087    
3088    2. Register Allocator
3089    
3090       Changes in interface [from Fermin, John]
3091    
3092    3. Alpha 8-bit SLL support [Fermin]
3093    
3094    4. All architectures
3095    
3096       A new module (ClusterExpandCopies) for expanding parallel copies.
3097    
3098    ----------------------------------------------------------------------
3099    Name: Allen Leung
3100    Date: 2001/02/27 23:07:00 EST
3101    Tag: leunga-20010227-minor-stuff
3102    
3103    1. Alpha bug fix for CMOVNE
3104    2. Handle mltree COND(..,FCMP ...,...)
3105    3. Bug fix in simplifier
3106    
3107    ----------------------------------------------------------------------
3108    Name: Matthias Blume
3109    Date: 2001/01/30 17:50:00 EST
3110    Tag: blume-20010130-sync
3111    Description:
3112    
3113    This is just a minor update to sync my devel branch with the main brach.
3114    The only visible change is the addition of some README files.
3115    
3116    ----------------------------------------------------------------------
3117    Name: Matthias Blume
3118    Date: 2001/01/12 23:30:00 JST
3119    Tag: blume-20010112-bootfiles
3120    Description:
3121    
3122    Made a new set of bootfiles that goes with the current state of the
3123    repository.
3124    
3125    ----------------------------------------------------------------------
3126    Name: Matthias Blume
3127    Date: 2001/01/12 21:20:00 JST
3128    Tag: blume-20010112-sync
3129    Description:
3130    
3131    I am just flushing out some minor changes that had accumulated in
3132    my private branch in order to sync with the main tree.  (This is
3133    mainly because I had CVS trouble when trying to merge _into_ my
3134    private branch.)
3135    
3136    Most people should be completely unaffected by this.
3137    
3138    ----------------------------------------------------------------------
3139    Name: Allen Leung
3140    Date: Thu Jan 11 21:03:00 EST 2001
3141    Tag: leunga-20010111-labexp=mltree
3142    Description:
3143    
3144    1.  Removed the type LabelExp and replace it by MLTree.
3145    2.  Rewritten mltree-simplify with the pattern matcher tool.
3146    3.  There were some bugs in alpha code generator which would break
3147        64-bit code generation.
3148    4.  Redo the tools to generate code with the
3149    5.  The CM files in MLRISC (and in src/system/smlnj/MLRISC)
3150        are now generated by perl scripts.
3151    
3152    ----------------------------------------------------------------------
3153    Name: Matthias Blume
3154    Date: 2001/01/10 21:55:00 JST
3155    Tag: blume-20010110-rcc
3156    Description:
3157    
3158    The RCC stuff now seems to work (but only on the x86).
3159    This required hacking of the c-calls interface (and -implementation) in
3160    MLRISC.
3161    
3162    Normal compiler users should be unaffected.
3163    
3164    ----------------------------------------------------------------------
3165    Name: Matthias Blume
3166    Date: 2001/01/09 01:20:00 JST
3167    Tag: blume-20010109-rcc
3168    Description:
3169    
3170    This is a fairly big patch, flushing out a large number of pending
3171    changes that I made to my development copy over the last couple of days.
3172    
3173    Of practical relevance at this moment is a workaround for a pickling
3174    bug that Allen ran into the other day.  The cause of the bug itself is
3175    still unknown and it might be hard to fix it properly, but the
3176    workaround has some merits of its own (namely somewhat reducing pickling
3177    overhead for certain libraries).  Therefore, I think this solution should
3178    be satisfactory at this time.
3179    
3180    The rest of the changes (i.e., the vast majority) has to do with my
3181    ongoing efforts of providing direct support for C function calls from
3182    ML.  At the moment there is a new primop "RAW_CCALL", typing magic
3183    in types/cproto.sml (invoked from FLINT/trans/translate.sml), a new
3184    case in the FLINT CPS datatype (RCC), changes to cps/convert.sml to
3185    translate uses of RAW_CCALL into RCC, and changes to mlriscGen.sml to
3186    handle RCC.
3187    
3188    The last part (the changes to mlriscGen.sml) are still known to be
3189    wrong on the x86 and not implemented on all other architectures.  But
3190    the infrastructure is in place. I had to change a few functor
3191    signatures in the backend to be able to route the CCalls interface
3192    from MLRISC there, and I had to specialize the mltree type (on the
3193    x86) to include the necessary extensions. (The extensions themselves
3194    were already there and redy to go in MLRISC/x86).
3195    
3196    Everything should be very happy as soon as someone helps me with
3197    mlriscGen.sml...
3198    
3199    In any case, nothing of this should matter to anyone as long as the
3200    new primop is not being used (which is going to be the case unless you
3201    find it where I hid it :). The rest of the compiler is completely
3202    unaffected.
3203    
3204    ----------------------------------------------------------------------
3205    Name: Matthias Blume
3206    Date: 2001/01/05 00:30:00 JST
3207    Tag: blume-20010105-primops
3208    Description:
3209    
3210    Added some experimental support for work that I am doing right now.
3211    These changes mostly concern added primops, but there is also a new
3212    experimental C library in the runtime system (but currently not enabled
3213    anywhere except on Linux/X86).
3214    
3215    In the course of adding primops (and playing with them), I discovered that
3216    Zhong's INL_PRIM hack (no type info for certain primops) was, in fact, badly
3217    broken.  (Zhong was very right he labeled this stuff as "major gross hack".)
3218    To recover, I made type information in INL_PRIM mandatory and changed
3219    prim.sml as well as built-in.sml accordingly.  The InLine structure now
3220    has complete, correct type information (i.e., no bottom types).
3221    
3222    Since all these changes mean that we need new binfiles, I also bumped the
3223    version number to 110.32.1.
3224    
3225    ----------------------------------------------------------------------
3226    Name: Matthias Blume
3227    Date: 2000/12/30 22:10:00 JST
3228    Tag: blume-20001230-various
3229    Description:
3230    
3231    Added proxy libraries for MLRISC and let MLRISC libraries refer
3232    to each other using path anchors.  (See CM manual for explanation.)
3233    
3234    Updated CM documentation.
3235    
3236    Fixed some bugs in CM.
3237    
3238    Implemented "proxy" libraries (= syntactic sugar for CM).
3239    
3240    Added "-quiet" option to makeml and changed runtime system accordingly.
3241    
3242    Added cleanup handler for exportML to reset timers and compiler stats.
3243    
3244    ----------------------------------------------------------------------
3245    Name: Lal George
3246    Date: 2000/12/22 22:22:58 EST 2000
3247    Tag: Release_110_32
3248    Description:
3249    
3250            Infinite precision used throughout MLRISC.
3251            see MLRISC/mltree/machine-int.sig
3252    
3253    ----------------------------------------------------------------------
3254    Name: Matthias Blume
3255    Date: 2000/12/22 23:16:00 JST
3256    Tag: blume-20001222-warn
3257    Description:
3258    
3259    Corrected wording and formatting of some CM warning message which I
3260    broke in my previous patch.
3261    
3262    ----------------------------------------------------------------------
3263    Name: Matthias Blume
3264    Date: 2000/12/22 21:20:00 JST
3265    Tag: blume-20001222-anchorenv
3266    Description:
3267    
3268    Fixed CM's handling of anchor environments in connection with CMB.make.
3269    
3270    ----------------------------------------------------------------------
3271    Name: Matthias Blume
3272    Date: 2000/12/22 13:15:00 JST
3273    Tag: blume-20001222-cleanup
3274    Description:
3275    
3276    Removed src/cm/ffi which does not (and did not) belong here.
3277    
3278    ----------------------------------------------------------------------
3279    Name: Matthias Blume
3280    Date: 2000/12/21 23:55:00 JST
3281    Tag: blume-20001221-exn
3282    Description:
3283    
3284    Probably most important: CM no longer silently swallows all exceptions
3285    in the compiler.
3286    Plus: some other minor CM changes.  For example, CM now reports some
3287    sizes for generated binfiles (code, data, envpickle, lambdapickle).
3288    
3289    ----------------------------------------------------------------------
3290    Name: Matthias Blume
3291    Date: 2000/12/15 00:01:05 JST
3292    Tag: blume-20001215-dirtool
3293    Description:
3294    
3295    - "dir" tool added.
3296    - improvements and cleanup to Tools structure
3297    - documentation updates
3298    
3299    ----------------------------------------------------------------------
3300    Name: Allen Leung
3301    Date: Thu Dec 14 03:45:24 EST 2000
3302    Description:
3303    Tag:  leunga-20001214-int-inf
3304    Description:
3305    
3306       In IntInf, added these standard functions, which are missing from our
3307    implementation:
3308    
3309        andb : int * int -> int
3310        xorb : int * int -> int
3311        orb  : int * int -> int
3312        notb : int -> int
3313         <<   : int * word -> int
3314        ~>>  : int * word -> int
3315    
3316       Not tested, I hope they are correct.
3317    
3318    ----------------------------------------------------------------------
3319    Name: Allen Leung
3320    Date: Fri Dec  8 19:23:26 EST 2000
3321    Description:
3322    Tag:  leunga-20001208-nowhere
3323    Description:
3324    
3325      Slight improvements to the 'nowhere' tool to handle OR-patterns,
3326    to generate better error messages etc.  Plus a brief manual.
3327    
3328    ----------------------------------------------------------------------
3329    Name: Lal George
3330    Date: 2000/12/08 09:54:02 EST 2000
3331    Tag: Release_110_31
3332    Description:
3333    
3334    - Version 110.31
3335    ----------------------------------------------------------------------
3336    Name: Allen Leung
3337    Date: Thu Dec  7 22:01:04 EST 2000
3338    Tag:  leunga-20001207-cell-monster-hack
3339    Description:
3340    
3341    Major MLRISC internal changes.  Affect all clients.
3342    Summary:
3343    
3344    1.  Type CELLS.cell = int is now replaced by a datatype.
3345        As a result, the old regmap is now gone.  Almost all interfaces
3346        in MLRISC change as a consequence.
3347    
3348    2.  A new brand version of machine description tool (v3.0) that generates
3349        modules expecting the new interface.  The old version is removed.
3350    
3351    3.  The RA interface has been further abstracted into two new functors.
3352        RISC_RA and X86RA.  These functors have much simpler interfaces.
3353        [See also directory MLRISC/demo.]
3354    
3355    4.  Some other new source->source code generation tools are available:
3356    
3357        a. MLRISC/Tools/RewriteGen -- generate rewriters from rules.
3358        b. MLRISC/Tools/WhereGen -- expands conditional pattern matching rules.
3359           I use this tool to generate the peephole optimizers---with the new
3360           cell type changes, peephole rules are becoming difficult to write
3361           without conditional pattern matching.
3362    
3363    5.  More Intmap -> IntHashTable change.  Previous changes by Matthias didn't
3364        cover the entire MLRISC source tree so many things broke.
3365    
3366    6.  CM files have been moved to the subdirectory MLRISC/cm.
3367        They are moved because there are a lot of them and they clutter up the
3368        root dir.
3369    
3370    7.  More detailed documentation to come...
3371    
3372        NOTE: To rebuild from 110.30 (ftp distribution), you'll have to do
3373        a makeml -rebuild first.  This is because of other other
3374        changes that Matthias has made (see below).
3375    
3376    
3377    ----------------------------------------------------------------------
3378    Name: Matthias Blume
3379    Date: 2000/11/30 23:12:00 JST
3380    Tag: blume-20001130-filereorg
3381    Description:
3382    
3383    Some manual updates and some file reorganizations in CM.
3384    
3385    ----------------------------------------------------------------------
3386    Name: Matthias Blume
3387    Date: 2000/11/24 17:45:00 JST
3388    Tag: blume-20001124-link
3389    Description:
3390    
3391    Drastically improved link traversal code for the case that the dynamic
3392    value was already loaded at bootstrap time.  As a result, CM and CMB
3393    now both load blazingly fast -- even on a very slow machine.  Also,
3394    memory consumption has been further reduced by this.
3395    
3396    Warning: The format of the PIDMAP file has changed.  THerefore, to
3397    bootstrap you have to do this:
3398    
3399    1. Run CMB.make
3400    2. Make a symbolic link for the boot directory:
3401         ln -s sml.boot.ARCH-OS xxx
3402    3. "Rebuild" the boot directory:
3403         ./makeml -boot xxx -rebuild sml ; rm xxx
3404    4. Boot normally:
3405          ./makeml
3406    
3407    ----------------------------------------------------------------------
3408    Name: Matthias Blume
3409    Date: 2000/11/21 21:20:00 JST
3410    Tag: blume-20001121-tools
3411    Description:
3412    
3413    Continued hacking on autoloading problem -- with success this time.
3414    Also changed tool-plugin mechanism.  See new CM manual.
3415    
3416    ----------------------------------------------------------------------
3417    Name: Matthias Blume
3418    Date: 2000/11/19 14:30:00 JST
3419    Tag:  blume-20001119-autoload
3420    Description:
3421    
3422    Some hacking to make autoloading faster.  Success for CMB, no success
3423    so far for CM.  There is a reduced structure CM' that autoloads faster.
3424    (This is a temporary, non-documented hack to be eliminated again when
3425    the general problem is solved.)
3426    
3427    ----------------------------------------------------------------------
3428    Name: Matthias Blume
3429    Date: 2000/11/17 14:10:00 JST
3430    Tag: blume-20001117-pickle-lib
3431    Description:
3432    
3433    1. Eliminated comp-lib.cm
3434    2. Made pickle-lib.cm
3435    3. Eliminated all uses of intset.sml (from comp-lib.cm)
3436    4. Replaced all uses of intmap.{sig,sml} (from comp-lib.cm) with
3437       equivalent constructs from smlnj-lib.cm (INtHashTable).
3438    5. Point 4. also goes for those uses of intmap.* in MLRISC.
3439       Duplicated intmap modules thrown out.
3440    6. Hunted down all duplicated SCC code and replaced it with
3441       equivalent stuff (GraphSCCFn from smlnj-lib.cm).
3442    7. Rewrote Feedback module.
3443    8. Moved sortedlist.sml into viscomp-lib.cm.  Eventually it
3444       should be thrown out and equivalent modules from smlnj-lib.cm
3445       should be used (IntRedBlackSet, IntListSet, ...).
3446    
3447    Confirmed that compiler compiles to fixpoint.
3448    
3449    ----------------------------------------------------------------------
3450    Name: Allen Leung
3451    Date: 2000/11/10 18:00:00
3452    Tag: leunga-20001110-new-x86-fp
3453    
3454    A new x86 floating point code generator has been added.
3455    By default this is turned off.  To turn this on, do:
3456    
3457        CM.autoload "$smlnj/compiler.cm";
3458        Compiler.Control.MLRISC.getFlag "x86-fast-fp" := true;
3459    
3460    Changes:
3461    
3462    1.  Changed FTAN to FPTAN so that the assembly output is correct.
3463    2.  Changed the extension callback for FTANGENT to generate:
3464    
3465              fptan
3466              fstp  %st(0)
3467        instead of
3468              fptan
3469              fstpl ftempmem
3470    
3471    3.  Numerous assembly fixes for x86.
3472    
3473    5.  Cleaned up the machine code output module x86/x86MC.sml and added
3474        support for a whole bunch of instructions and addressing modes:
3475    
3476          fadd/fsub/fsubr/fmul/fdiv/fdivr  %st, %st(n)
3477          faddp/fsubp/fsubrp/fmulp/fdivp/fdivrp  %st, %st(n)
3478          fadd/fsub/fsubr/fmul/fdiv/fdivr  %st(n), %st
3479          fiadd/fisub/fisubr/fimul/fidiv/fidivr mem
3480          fxch %st(n)
3481          fld %st(n)
3482          fst %st(n)
3483          fst mem
3484          fstp %st(n)
3485          fucom %st(n)
3486          fucomp %st(n)
3487    
3488        All these are now generated when the fast fp mode is turned on.
3489    
3490    6.  Removed the dedicated registers %st(0), ..., %st(7) from X86CpsRegs
3491    
3492    ----------------------------------------------------------------------
3493    Name: Matthias Blume
3494    Date: 2000/11/09 11:20:00 JST
3495    Tag: blume-20001109-scc
3496    Description:
3497    
3498    Eliminated some code duplication:
3499    
3500    1. Added "where" clause to GraphSCCFn in SML/NJ Library.
3501       (Otherwise the functor is useless.)
3502    2. Used GraphSCCFn where SCCUtilFun was used previously.
3503    3. Got rid of SCCUtilFun (in comp-lib.cm).
3504    
3505    ----------------------------------------------------------------------
3506    Name: Lal George
3507    Date: 2000/11/06 09:02:21 EST 2000
3508    Tag: Release_110_30
3509    Description:
3510    
3511    - Version 110.30
3512    ----------------------------------------------------------------------
3513    Name: Matthias Blume
3514    Date: 2000/11/04 14:45:00
3515    Tag: blume-20001104-mlbuild
3516    Description:
3517    
3518    - Made ml-build faster on startup.
3519    - Documentation fixes.
3520    
3521    ----------------------------------------------------------------------
3522    Name: Matthias Blume
3523    Date: 2000/11/02 17:00:00 JST
3524    Tag: blume-20001102-condcomp
3525    Description:
3526    
3527    - Small tweaks to pickler -- new BOOTFILES!
3528    - Version bumped to 110.29.2.
3529    - Added conditional compilation facility to init.cmi (see comment there).
3530    ----------------------------------------------------------------------
3531    Name: Allen Leung
3532    Date: 2000/10/23 19:31:00
3533    Tag: leunga-20001023-demo-ra
3534    
3535    1. Minor RA changes that improves spilling on x86 (affects Moby and C-- only)
3536    2. Test programs for the graph library updated
3537    3. Some new MLRISC demo programs added
3538    
3539    ----------------------------------------------------------------------
3540    Name: Matthias Blume
3541    Date: 2000/08/31 22:15:00 JST
3542    Tag: blume-20001017-errmsg
3543    Description:
3544    
3545    More error message grief: Where there used to be no messages, there
3546    now were some that had bogus error regions.  Fixed.
3547    
3548    ----------------------------------------------------------------------
3549    Name: Matthias Blume
3550    Date: 2000/08/31 17:30:00 JST
3551    Tag: blume-20001017-v110p29p1
3552    Description:
3553    
3554    I made a version 110.29.1 with new bootfiles.
3555    
3556    Changes:  Modified pickler/unpickler for faster and leaner unpickling.
3557              CM documentation changes and a small bugfix in CM's error reporting.
3558    
3559    ----------------------------------------------------------------------
3560    Name: Lal George
3561    Date: 2000/09/27 14:42:35 EDT
3562    Tag: george-20000927-nodestatus
3563    Description:
3564    
3565    Changed the type of the nodestatus, so that:
3566    
3567            SPILLED(~1)             is now SPILLED
3568            SPILLED(m) where m>=0   is now MEMREG(m)
3569            SPILLED(s) where s<~1   is now SPILL_LOC(~s)
3570    
3571    ----------------------------------------------------------------------
3572    Name: Matthias Blume
3573    Date: 2000/09/07 14:45:00 JST
3574    Tag: blume-20000907-cmerrmsg
3575    Description:
3576    
3577    Small tweak to CM to avoid getting ML syntax error messages twice.
3578    
3579    ----------------------------------------------------------------------
3580    Name: Matthias Blume
3581    Date: 2000/08/31 18:00:00 JST
3582    Tag: blume-20000831-cvsbootfiles
3583    Description:
3584    
3585    New URL for boot files (because the 110.29 files on the BL server do
3586    now work correctly with my updated install scripts for yacc and lex).
3587    
3588    ----------------------------------------------------------------------
3589    Name: Matthias Blume
3590    Date: 2000/08/08 12:33:00 JST
3591    Tag: blume-20000808-manual
3592    Description:
3593    
3594    Tiny update to CM manual.
3595    
3596    ----------------------------------------------------------------------
3597    Name: Allen Leung
3598    Date: 2000/08/7 19:31:00
3599    Tag: leunga-20000807-a-whole-bunch-of-stuff
3600    
3601      Moby, C--, SSA, x86, machine descriptions etc.  Should only affect C--
3602    and Mobdy.
3603    
3604    1.  x86
3605    
3606       a.  Fixes to peephole module by John and Dan.
3607       b.  Assembly fix to SETcc by Allen.
3608       c.  Fix to c-call by John.
3609       d.  Fix to spilling by John.  (This one deals with the missing FSTPT case)
3610       e.  Instruction selection optimization to SETcc as suggested by John.
3611    
3612           For example,
3613    
3614            MV(32, x, COND(32, CMP(32, LT, a, b), LI 1, LI 0))
3615    
3616           should generate:
3617    
3618            MOVL a, x
3619            SUBL b, x
3620            SHRL 31, x
3621