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revision 627, Tue Apr 25 20:40:35 2000 UTC revision 1201, Fri May 17 20:48:38 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: 2002/05/17 16:49:00 EDT
18    Tag: blume-20020517-controls
19    Description:
20    
21    0. John Reppy made several modifications to the SML/NJ library.
22       In particular, there is a shiny new controls-lib.cm.
23    
24    1. Pushed new controls interface through compiler so that everything
25       compiles again.
26    
27    2. Added FormatComb and FORMAT_COMB to the CML version of the
28       SML/NJ library (so that CML compiles again).
29    
30    3. Modified init scripts because XXX_DEFAULT environment variables
31       are no longer with us.  (Boot-time initialization is now done
32       using the same environment variables that are also used for
33       startup-time initialization of controls.)
34    
35    ----------------------------------------------------------------------
36    Name: Lal George
37    Date: 2002/05/15 09:20:10 EDT
38    Tag: george-20020515-pseudo-op-decls
39    Description:
40    
41            All pseudo-ops emitted before the first segment declaration
42    such as TEXT, DATA, and BSS directives are assumed to be global
43    declarations and are emitted first in the assembly file. This is
44    useful in a number of situations where one has pseudo-ops that are not
45    specific to any segment, and also works around the constraint that one
46    cannot have client pseudo-ops in the TEXT segment.
47    
48            Because no segment is associated with these declarations it is
49    an error to allocate any space or objects before the first segment
50    directive and an exception will be raised. However, we cannot make
51    this check for client pseudo-ops.
52    
53            These top level declarations are a field in the CFG graph_info.
54    In theory you can continue to add to this field after the CFG has been
55    built -- provided you know what you are doing;-)
56    
57    ----------------------------------------------------------------------
58    Name: Matthias Blume
59    Date: 2002/05/13 16:40:00 EDT
60    Tag: blume-20020513-pp-etc
61    Description:
62    
63    A few minor bugfixes:
64    
65      - Stopgap measure for bug recently reported by Elsa Gunter (ppDec).
66        (Bogus printouts for redefined bindings still occur.  Compiler
67        bug should no longer occur now.  We need to redo the prettyprinter
68        from scratch.)
69    
70      - CM pathname printer now also adds escape sequences for ( and )
71    
72      - commend and docu fixes for ml-nlffi
73    
74    ----------------------------------------------------------------------
75    Name: Matthias Blume
76    Date: 2002/05/10 16:40:00 EDT
77    Tag: blume-20020510-erg-textio
78    Description:
79    
80    Applied the following bugfix provided by Emden Gansner:
81    
82        Output is corrupted when outputSubstr is used rather than output.
83    
84        The problem occurs when a substring
85    
86            ss = (s, dataStart, dataLen)
87    
88        where dataStart > 0, fills a stream buffer with avail bytes left.
89        avail bytes of s, starting at index dataStart, are copied into the
90        buffer, the buffer is flushed, and then the remaining dataLen-avail
91        bytes of ss are copied into the beginning of the buffer. Instead of
92        starting this copy at index dataStart+avail in s, the current code
93        starts the copy at index avail.
94    
95        Fix:
96        In text-io-fn.sml, change line 695 from
97             val needsFlush = copyVec(v, avail, dataLen-avail, buf, 0)
98        to
99             val needsFlush = copyVec(v, dataStart+avail, dataLen-avail, buf, 0)
100    
101    ----------------------------------------------------------------------
102    Name: Matthias Blume
103    Date: 2002/04/12 13:55:00 EDT
104    Tag: blume-20020412-assyntax
105    Description:
106    
107    1. Grabbed newer assyntax.h from the XFree86 project.
108    2. Fiddled with how to compile X86.prim.asm without warnings.
109    3. (Very) Minor cleanup in CM.
110    
111    ----------------------------------------------------------------------
112    Name: Matthias Blume
113    Date: 2002/04/01 (no joke!) 17:07:00 EST
114    Tag: blume-20020401-x86div
115    Description:
116    
117    Added full support for div/mod/rem/quot on the x86, using the machine
118    instruction's two results (without clumsily recomputing the remainder)
119    directly where appropriate.
120    
121    Some more extensive power-of-two support was added to the x86 instruction
122    selector (avoiding expensive divs, mods, and muls where they can be
123    replaced with cheaper shifts and masks).  However, this sort of thing
124    ought to be done earlier, e.g., within the CPS optimizer so that
125    all architectures benefit from it.
126    
127    The compiler compiles to a fixed point, but changes might be somewhat
128    fragile nevertheless.  Please, report any strange things that you might
129    see wrt. div/mod/quot/rem...
130    
131    ----------------------------------------------------------------------
132    Name: Matthias Blume
133    Date: 2002/03/29 17:22:00
134    Tag: blume-20020329-div
135    Description:
136    
137    Fixed my broken div/mod logic.  Unfortunately, this means that the
138    inline code for div/mod now has one more comparison than before.
139    Fast paths (quotient > 0 or remainder = 0) are not affected, though.
140    The problem was with quotient = 0, because that alone does not tell
141    us which way the rounding went.  One then has to look at whether
142    remainder and divisor have the same sign...  :(
143    
144    Anyway, I replaced the bootfiles with fresh ones...
145    
146    ----------------------------------------------------------------------
147    Name: Matthias Blume
148    Date: 2002/03/29 14:10:00 EST
149    Tag: blume-20020329-inlprims
150    Description:
151    
152    NEW BOOTFILES!!!    Version number bumped to 110.39.3.
153    
154    Primops have changed. This means that the bin/boot-file formats have
155    changed as well.
156    
157    To make sure that there is no confusion, I made a new version.
158    
159    
160    CHANGES:
161    
162    * removed REMT from mltree (remainder should never overflow).
163    
164    * added primops to deal with divisions of all flavors to the frontend
165    
166    * handled these primops all the way through so they map to their respective
167      MLRISC support
168    
169    * used these primops in the implementation of Int, Int32, Word, Word32
170    
171    * removed INLDIV, INLMOD, and INLREM as they are no longer necessary
172    
173    * parameterized INLMIN, INLMAX, and INLABS by a numkind
174    
175    * translate.sml now deals with all flavors of INL{MIN,MAX,ABS}, including
176      floating point
177    
178    * used INL{MIN,MAX,ABS} in the implementation of Int, Int32, Word, Word32,
179      and Real (but Real.abs maps to a separate floating-point-only primop)
180    
181    
182    TODO items:
183    
184    * Hacked Alpha32 instruction selection, disabling the selection of REMx
185      instructions because the machine instruction encoder cannot handle
186      them.  (Hppa, PPC, and Sparc instruction selection did not handle
187      REM in the first place, and REM is supported by the x86 machine coder.)
188    
189    * Handle DIV and MOD with DIV_TO_NEGINF directly in the x86 instruction
190      selection phase.  (The two can be streamlined because the hardware
191      delivers both quotient and remainder at the same time anyway.)
192    
193    * Think about what to do with "valOf(Int32.minInt) div ~1" and friends.
194      (Currently the behavior is inconsistent both across architectures and
195      wrt. the draft Basis spec.)
196    
197    * Word8 should eventually be handled natively, too.
198    
199    * There seems to be one serious bug in mltree-gen.sml.  It appears, though,
200      as if there currently is no execution path that could trigger it in
201      SML/NJ.  (The assumptions underlying functions arith and promotable do not
202      hold for things like multiplication and division.)
203    
204    ----------------------------------------------------------------------
205    Name: Matthias Blume
206    Date: 2002/03/27 16:27:00 EST
207    Tag: blume-20020327-mlrisc-divisions
208    Description:
209    
210    Added support for all four division operations (ML's div, mod, quot,
211    and rem) to MLRISC.  In the course of doing so, I also rationalized
212    the naming (no more annoying switch-around of DIV and QUOT), by
213    parameterizing the operation by div_rounding_mode (which can be either
214    DIV_TO_ZERO or DIV_TO_NEGINF).
215    
216    The generic MLTreeGen functor takes care of compiling all four
217    operations down to only round-to-zero div.
218    
219    Missing pieces:
220    
221      * Doing something smarter than relying on MLTreeGen on architectures
222        like, e.g., the x86 where hardware division delivers both quotient and
223        remainder at the same time.  With this, the implementation of the
224        round-to-neginf operations could be further streamlined.
225    
226      * Remove inlining support for div/mod/rem from the frontend and replace it
227        with primops that get carried through to the backend.  Do this for all
228        int and word types.
229    
230    ----------------------------------------------------------------------
231    Name: Matthias Blume
232    Date: 2002/03/25 17:25:00 EST
233    Tag: blume-20020325-divmod
234    Description:
235    
236    I improved (hopefully without breaking them) the implementation of Int.div,
237    Int.mod, and Int.rem.   For this, the code in translate.sml now takes
238    advantage of the following observations:
239    
240      Let  q = x quot y      r = x rem y
241           d = x div  y      m = x mod y
242    
243    where "quot" is the round-to-zero version of integer division that
244    hardware usually provides.  Then we have:
245    
246         r = x - q * y        where neither the * nor the - will overflow
247         d = if q >= 0 orelse x = q * y then q else q - 1
248                              where neither the * nor the - will overflow
249         m = if q >= 0 orelse r = 0 then r else r + y
250                              where the + will not overflow
251    
252    This results in substantial simplification of the generated code.
253    The following table shows the number of CFG nodes and edges generated
254    for
255            fun f (x, y) = x OPER y
256            (* with OPER \in div, mod, quot, rem *)
257    
258    
259        OPER | nodes(old) | edges(old) | nodes(new) | edges(new)
260        --------------------------------------------------------
261         div |         24 |         39 |         12 |         16
262         mod |         41 |         71 |         12 |         16
263        quot |          8 |         10 |          8 |         10
264         rem |         10 |         14 |          8 |         10
265    
266    
267    ----------------------------------------------------------------------
268    Name: Matthias Blume
269    Date: 2002/03/25 22:06:00 EST
270    Tag: blume-20020325-cprotobug
271    Description:
272    
273    Fixed a bug in cproto (c prototype decoder).
274    
275    ----------------------------------------------------------------------
276    Name: Matthias Blume
277    Date: 2002/03/25 16:00:00 EST
278    Tag: blume-20020325-raw-primops
279    Description:
280    
281    I did some cleanup to Allen's new primop code and
282    replaced yesterday's bootfiles with new ones.
283    (But they are stored in the same place.)
284    
285    ----------------------------------------------------------------------
286    Name: Matthias Blume
287    Date: 2002/03/24 22:40:00 EST
288    Tag: blume-20020324-bootfiles
289    Description:
290    
291    Made the bootfiles that Allen asked for.
292    
293    ----------------------------------------------------------------------
294    Name: Allen Leung
295    Date: 2002/03/23 15:50:00 EST
296    Tag: leunga-20020323-flint-cps-rcc-primops
297    Description:
298    
299      1. Changes to FLINT primops:
300    
301        (* make a call to a C-function;
302         * The primop carries C function prototype information and specifies
303         * which of its (ML-) arguments are floating point. C prototype
304         * information is for use by the backend, ML information is for
305         * use by the CPS converter. *)
306      | RAW_CCALL of { c_proto: CTypes.c_proto,
307                       ml_args: ccall_type list,
308                       ml_res_opt: ccall_type option,
309                       reentrant : bool
310                     } option
311       (* Allocate uninitialized storage on the heap.
312        * The record is meant to hold short-lived C objects, i.e., they
313        * are not ML pointers.  With the tag, the representation is
314        * the same as RECORD with tag tag_raw32 (sz=4), or tag_fblock (sz=8)
315        *)
316      | RAW_RECORD of {tag:bool,sz:int}
317      and ccall_type = CCALL_INT32 | CCALL_REAL64 | CCALL_ML_PTR
318    
319      2.  These CPS primops are now overloaded:
320    
321           rawload of {kind:numkind}
322           rawstore of {kind:numkind}
323    
324          The one argument form is:
325    
326             rawload {kind} address
327    
328          The two argument form is:
329    
330             rawload {kind} [ml object, byte-offset]
331    
332      3. RAW_CCALL/RCC now takes two extra arguments:
333    
334         a. The first is whether the C call is reentrant, i.e., whether
335            ML state should be saved and restored.
336         b. The second argument is a string argument specifying the name of
337            library and the C function.
338    
339         These things are currently not handled in the code generator, yet.
340    
341      4. In CProto,
342    
343         An encoding type of "bool" means "ml object" and is mapped into
344         C prototype of PTR.  Note that "bool" is different than "string",
345         even though "string" is also mapped into PTR, because "bool"
346         is assigned an CPS type of BOGt, while "string" is assigned INT32t.
347    
348      5. Pickler/unpicker
349    
350         Changed to handle RAW_RECORD and newest RAW_CCALL
351    
352      6. MLRiscGen,
353    
354         1. Changed to handle the new rawload/rawstore/rawrecord operators.
355         2. Code for handling C Calls has been moved to a new module CPSCCalls,
356            in the file CodeGen/cpscompile/cps-c-calls.sml
357    
358      7. Added the conditional move operator
359    
360             condmove of branch
361    
362         to cps.  Generation of this is still buggy so it is currently
363         disabled.
364    
365    ----------------------------------------------------------------------
366    Name: Lal George
367    Date: 2002/03/22 14:18:25 EST
368    Tag: george-20020322-cps-branch-prob
369    Description:
370    
371    Implemented the Ball-Larus branch prediction-heuristics, and
372    incorporated graphical viewers for control flow graphs.
373    
374    Ball-Larus Heuristics:
375    ---------------------
376    See the file compiler/CodeGen/cpscompile/cpsBranchProb.sml.
377    
378    By design it uses the Dempster-Shafer theory for combining
379    probabilities.  For example, in the function:
380    
381        fun f(n,acc) = if n = 0 then acc else f(n-1, n*acc)
382    
383    the ball-larus heuristics predicts that the n=0 is unlikely
384    (OH-heuristic), and the 'then' branch is unlikely because of the
385    RH-heuristic -- giving the 'then' branch an even lower combined
386    probability using the Dempster-Shafer theory.
387    
388    Finally, John Reppy's loop analysis in MLRISC, further lowers the
389    probability of the 'then' branch because of the loop in the else
390    branch.
391    
392    
393    Graphical Viewing:
394    ------------------
395    I merely plugged in Allen's graphical viewers into the compiler. The
396    additional code is not much. At the top level, saying:
397    
398            Control.MLRISC.getFlag "cfg-graphical-view" := true;
399    
400    will display the graphical view of the control flow graph just before
401    back-patching.  daVinci must be in your path for this to work. If
402    daVinci is not available, then the default viewer can be changed
403    using:
404    
405            Control.MLRISC.getString "viewer"
406    
407    which can be set to "dot" or "vcg" for the corresponding viewers. Of
408    course, these viewers must be in your path.
409    
410    The above will display the compilation unit at the level of clusters,
411    many of which are small, boring, and un-interesting. Also setting:
412    
413            Control.MLRISC.getInt "cfg-graphical-view_size"
414    
415    will display clusters that are larger than the value set by the above.
416    
417    
418    ----------------------------------------------------------------------
419    Name: Matthias Blume
420    Date: 2002/03/21 22:20:00 EST
421    Tag: blume-20020321-kmp-bugfix
422    Description:
423    
424    Changed the interface to the KMP routine in PreString and fixed
425    a minor bug in one place where it was used.
426    
427    ----------------------------------------------------------------------
428    Name: Allen Leung
429    Date: 2002/03/21 20:30:00 EST
430    Tag: leunga-20020321-cfg
431    Description:
432    
433      Fixed a potential problem in cfg edge splitting.
434    
435    ----------------------------------------------------------------------
436    Name: Allen Leung
437    Date: 2002/03/21 17:15:00 EST
438    Tag: leunga-20020321-x86-fp-cfg
439    Description:
440    
441      1. Recoded the buggy parts of x86-fp.
442    
443         a. All the block reordering code has been removed.
444            We now depend on the block placement phases to do this work.
445    
446         b. Critical edge splitting code has been simplified and moved into the
447            CFG modules, as where they belong.
448    
449         Both of these were quite buggy and complex.  The code is now much, much
450         simpler.
451    
452      2. X86 backend.
453    
454         a. Added instructions for 64-bit support.  Instruction selection for
455            64-bit has not been committed, however, since that
456            requires changes to MLTREE which haven't been approved by
457            Lal and John.
458    
459         b. Added support for FUCOMI and FUCOMIP when generating code for
460            PentiumPro and above.  We only generate these instructions in
461            the fast-fp mode.
462    
463         c. Added cases for JP and JNP in X86FreqProps.
464    
465      3. CFG
466    
467         CFG now has a bunch of methods for edge splitting and merging.
468    
469      4. Machine description.
470    
471         John's simplification of MLTREE_BASIS.fcond broke a few machine
472         description things:
473    
474         rtl-build.{sig,sml} and hppa.mdl fixed.
475    
476         NOTE: the machine description stuff in the repository is still broken.
477               Again, I can't put my fixes in because that involves
478               changes to MLTREE.
479    
480    ----------------------------------------------------------------------
481    Name: Matthias Blume
482    Date: 2002/03/20 15:55:00 EST
483    Tag: blume-20020320-kmp
484    Description:
485    
486    Implemented Knuth-Morris-Pratt string matching in PreString and used
487    it for String.isSubstring, Substring.isSubstring, and
488    Substring.position.
489    
490    (Might need some stress-testing.  Simple examples worked fine.)
491    
492    ----------------------------------------------------------------------
493    Name: Matthias Blume
494    Date: 2002/03/19 16:37:00 EST
495    Tag: blume-20020319-witnesses
496    Description:
497    
498    Added a structure C.W and functions convert/Ptr.convert to ml-nlffi-lib.
499    
500    This implements a generic mechanism for changing constness qualifiers
501    anywhere within big C types without resorting to outright "casts".
502    (So far, functions such as C.rw/C.ro or C.Ptr.rw/C.Ptr.ro only let you
503    modify the constness at the outermost level.)
504    The implementation of "convert" is based on the idea of "witness"
505    values -- values that are not used by the operation but whose types
506    "testify" to their applicability.  On the implementation side, "convert"
507    is simply a projection (returning its second curried argument).  With
508    cross-module inlining, it should not result in any machine code being
509    generated.
510    
511    ----------------------------------------------------------------------
512    Name: Matthias Blume
513    Date: 2002/03/15 16:40:00 EST
514    Tag: blume-20020315-basis
515    Description:
516    
517    Provided (preliminary?) implementations for
518    
519      {String,Substring}.{concatWith,isSuffix,isSubstring}
520    
521    and
522    
523      Substring.full
524    
525    Those are in the Basis spec but they were missing in SML/NJ.
526    
527    ----------------------------------------------------------------------
528    Name: Matthias Blume
529    Date: 2002/03/14 21:30:00 EST
530    Tag: blume-20020314-controls
531    Description:
532    
533    Controls:
534    ---------
535    
536    1. Factored out the recently-added Controls : CONTROLS stuff and put
537       it into its own library $/controls-lib.cm.  The source tree for
538       this is under src/smlnj-lib/Controls.
539    
540    2. Changed the names of types and functions in this interface, so they
541       make a bit more "sense":
542    
543          module -> registry
544          'a registry -> 'a group
545    
546    3. The interface now deals in ref cells only.  The getter/setter interface
547       is (mostly) gone.
548    
549    4. Added a function that lets one register an already-existing ref cell.
550    
551    5. Made the corresponding modifications to the rest of the code so that
552       everything compiles again.
553    
554    6. Changed the implementation of Controls.MLRISC back to something closer
555       to the original.  In particular, this module (and therefore MLRISC)
556       does not depend on Controls.  There now is some link-time code in
557       int-sys.sml that registers the MLRISC controls with the Controls
558       module.
559    
560    CM:
561    ---
562    
563      * One can now specify the lambda-split aggressiveness in init.cmi.
564    
565    ----------------------------------------------------------------------
566    Name: Allen Leung
567    Date: 2002/03/13 17:30:00 EST
568    Tag: leunga-20020313-x86-fp-unary
569    Description:
570    
571    Bug fix for:
572    
573    > leunga@weaselbane:~/Yale/tmp/sml-dist{21} bin/sml
574    > Standard ML of New Jersey v110.39.1 [FLINT v1.5], March 08, 2002
575    > - fun f(x,(y,z)) = Real.~ y;
576    > [autoloading]
577    > [autoloading done]
578    >       fchsl   (%eax), 184(%esp)
579    > Error: MLRisc bug: X86MCEmitter.emitInstr
580    >
581    > uncaught exception Error
582    >   raised at: ../MLRISC/control/mlriscErrormsg.sml:16.14-16.19
583    
584    The problem was that the code generator did not generate any fp registers
585    in this case, and the ra didn't know that it needed to run the X86FP phase to
586    translate the pseudo fp instruction.   This only happened with unary fp
587    operators in certain situations.
588    
589    ----------------------------------------------------------------------
590    Name: Matthias Blume
591    Date: 2002/03/13 14:00:00 EST
592    Tag: blume-20020313-overload-etc
593    Description:
594    
595    1. Added _overload as a synonym for overload for backward compatibility.
596       (Control.overloadKW must be true for either version to be accepted.)
597    
598    2. Fixed bug in install script that caused more things to be installed
599       than what was requested in config/targets.
600    
601    3. Made CM aware of the (_)overload construct so that autoloading
602       works.
603    
604    ----------------------------------------------------------------------
605    Name: Matthias Blume
606    Date: 2002/03/12 22:03:00 EST
607    Tag: blume-20020312-url
608    Description:
609    
610    Forgot to update BOOT and srcarchiveurl.
611    
612    ----------------------------------------------------------------------
613    Name: Matthias Blume
614    Date: 2002/03/12 17:30:00 EST
615    Tag: blume-20020312-version110392
616    Description:
617    
618    Yet another version number bump (because of small changes to the
619    binfile format).  Version number is now 110.39.2.  NEW BOOTFILES!
620    
621    Changes:
622    
623      The new pid generation scheme described a few weeks ago was overly
624      complicated.  I implemented a new mechanism that is simpler and
625      provides a bit more "stability":  Once CM has seen a compilation
626      unit, it keeps its identity constant (as long as you do not delete
627      those crucial CM/GUID/* files).  This means that when you change
628      an interface, compile, then go back to the old interface, and
629      compile again, you arrive at the original pid.
630    
631      There now also is a mechanism that instructs CM to use the plain
632      environment hash as a module's pid (effectively making its GUID
633      the empty string).  For this, "noguid" must be specified as an
634      option to the .sml file in question within its .cm file.
635      This is most useful for code that is being generated by tools such
636      as ml-nlffigen (because during development programmers tend to
637      erase the tool's entire output directory tree including CM's cached
638      GUIDs).  "noguid" is somewhat dangerous (since it can be used to locally
639      revert to the old, broken behavior of SML/NJ, but in specific cases
640      where there is no danger of interface confusion, its use is ok
641      (I think).
642    
643      ml-nlffigen by default generates "noguid" annotations.  They can be
644      turned off by specifying -guid in its command line.
645    
646    ----------------------------------------------------------------------
647    Name: Lal George
648    Date: 2002/03/12 12 14:42:36 EST
649    Tag: george-20020312-frequency-computation
650    Description:
651    
652    Integrated jump chaining and static block frequency into the
653    compiler. More details and numbers later.
654    
655    ----------------------------------------------------------------------
656    Name: Lal George
657    Date: 2002/03/11 11 22:38:53 EST
658    Tag: george-20020311-jump-chain-elim
659    Description:
660    
661    Tested the jump chain elimination on all architectures (except the
662    hppa).  This is on by default right now and is profitable for the
663    alpha and x86, however, it may not be profitable for the sparc and ppc
664    when compiling the compiler.
665    
666    The gc test will typically jump to a label at the end of the cluster,
667    where there is another jump to an external cluster containing the actual
668    code to invoke gc. This is to allow factoring of common gc invocation
669    sequences. That is to say, we generate:
670    
671            f:
672               testgc
673               ja   L1      % jump if above to L1
674    
675            L1:
676               jmp L2
677    
678    
679    After jump chain elimination the 'ja L1' instructions is converted to
680    'ja L2'. On the sparc and ppc, many of the 'ja L2' instructions may end
681    up being implemented in their long form (if L2 is far away) using:
682    
683            jbe     L3      % jump if below or equal to L3
684            jmp     L2
685         L3:
686            ...
687    
688    
689    For large compilation units L2  may be far away.
690    
691    
692    ----------------------------------------------------------------------
693    Name: Matthias Blume
694    Date: 2002/03/11 13:30:00 EST
695    Tag: blume-20020311-mltreeeval
696    Description:
697    
698    A functor parameter was missing.
699    
700    ----------------------------------------------------------------------
701    Name: Allen Leung
702    Date: 2002/03/11 10:30:00 EST
703    Tag: leunga-20020311-runtime-string0
704    Description:
705    
706       The representation of the empty string now points to a
707    legal null terminated C string instead of unit.  It is now possible
708    to convert an ML string into C string with InlineT.CharVector.getData.
709    This compiles into one single machine instruction.
710    
711    ----------------------------------------------------------------------
712    Name: Allen Leung
713    Date: 2002/03/10 23:55:00 EST
714    Tag: leunga-20020310-x86-call
715    Description:
716    
717       Added machine generation for CALL instruction (relative displacement mode)
718    
719    ----------------------------------------------------------------------
720    Name: Matthias Blume
721    Date: 2002/03/08 16:05:00
722    Tag: blume-20020308-entrypoints
723    Description:
724    
725    Version number bumped to 110.39.1.  NEW BOOTFILES!
726    
727    Entrypoints: non-zero offset into a code object where execution should begin.
728    
729    - Added the notion of an entrypoint to CodeObj.
730    - Added reading/writing of entrypoint info to Binfile.
731    - Made runtime system bootloader aware of entrypoints.
732    - Use the address of the label of the first function given to mlriscGen
733      as the entrypoint.  This address is currently always 0, but it will
734      not be 0 once we turn on block placement.
735    - Removed the linkage cluster code (which was The Other Way(tm) of dealing
736      with entry points) from mlriscGen.
737    
738    ----------------------------------------------------------------------
739    Name: Allen Leung
740    Date: 2002/03/07 20:45:00 EST
741    Tag: leunga-20020307-x86-cmov
742    Description:
743    
744       Bug fixes for CMOVcc on x86.
745    
746       1. Added machine code generation for CMOVcc
747       2. CMOVcc is now generated in preference over SETcc on PentiumPro or above.
748       3. CMOVcc cannot have an immediate operand as argument.
749    
750    ----------------------------------------------------------------------
751    Name: Matthias Blume
752    Date: 2002/03/07 16:15:00 EST
753    Tag: blume-20020307-controls
754    Description:
755    
756    This is a very large but mostly boring patch which makes (almost)
757    every tuneable compiler knob (i.e., pretty much everything under
758    Control.* plus a few other things) configurable via both the command
759    line and environment variables in the style CM did its configuration
760    until now.
761    
762    Try starting sml with '-h' (or, if you are brave, '-H')
763    
764    To this end, I added a structure Controls : CONTROLS to smlnj-lib.cm which
765    implements the underlying generic mechanism.
766    
767    The interface to some of the existing such facilities has changed somewhat.
768    For example, the MLRiscControl module now provides mkFoo instead of getFoo.
769    (The getFoo interface is still there for backward-compatibility, but its
770    use is deprecated.)
771    
772    The ml-build script passes -Cxxx=yyy command-line arguments through so
773    that one can now twiddle the compiler settings when using this "batch"
774    compiler.
775    
776    TODO items:
777    
778    We should go through and throw out all controls that are no longer
779    connected to anything.  Moreover, we should go through and provide
780    meaningful (and correct!) documentation strings for those controls
781    that still are connected.
782    
783    Currently, multiple calls to Controls.new are accepted (only the first
784    has any effect).  Eventually we should make sure that every control
785    is being made (via Controls.new) exactly once.  Future access can then
786    be done using Controls.acc.
787    
788    Finally, it would probably be a good idea to use the getter-setter
789    interface to controls rather than ref cells.  For the time being, both
790    styles are provided by the Controls module, but getter-setter pairs are
791    better if thread-safety is of any concern because they can be wrapped.
792    
793    *****************************************
794    
795    One bug fix: The function blockPlacement in three of the MLRISC
796    backpatch files used to be hard-wired to one of two possibilities at
797    link time (according to the value of the placementFlag).  But (I
798    think) it should rather sense the flag every time.
799    
800    *****************************************
801    
802    Other assorted changes (by other people who did not supply a HISTORY entry):
803    
804    1. the cross-module inliner now works much better (Monnier)
805    2. representation of weights, frequencies, and probabilities in MLRISC
806       changed in preparation of using those for weighted block placement
807       (Reppy, George)
808    
809    ----------------------------------------------------------------------
810    Name: Lal George
811    Date: 2002/03/07 14:44:24 EST 2002
812    Tag: george-20020307-weighted-block-placement
813    
814    Tested the weighted block placement optimization on all architectures
815    (except the hppa) using AMPL to generate the block and edge frequencies.
816    Changes were required in the machine properties to correctly
817    categorize trap instructions. There is an MLRISC flag
818    "weighted-block-placement" that can be used to enable weighted block
819    placement, but this will be ineffective without block/edge
820    frequencies (coming soon).
821    
822    
823    ----------------------------------------------------------------------
824    Name: Lal George
825    Date: 2002/03/05 17:24:48 EST
826    Tag: george-20020305-linkage-cluster
827    
828    In order to support the block placement optimization, a new cluster
829    is generated as the very first cluster (called the linkage cluster).
830    It contains a single jump to the 'real' entry point for the compilation
831    unit. Block placement has no effect on the linkage cluster itself, but
832    all the other clusters  have full freedom in the manner in which they
833    reorder blocks or functions.
834    
835    On the x86 the typical linkage code that is generated is:
836       ----------------------
837            .align 2
838       L0:
839            addl    $L1-L0, 72(%esp)
840            jmp     L1
841    
842    
843            .align  2
844       L1:
845       ----------------------
846    
847    72(%esp) is the memory location for the stdlink register. This
848    must contain the address of the CPS function being called. In the
849    above example, it contains the address of  L0; before
850    calling L1 (the real entry point for the compilation unit), it
851    must contain the address for L1, and hence
852    
853            addl $L1-L0, 72(%esp)
854    
855    I have tested this on all architectures except the hppa.The increase
856    in code size is of course negligible
857    
858    ----------------------------------------------------------------------
859    Name: Allen Leung
860    Date: 2002/03/03 13:20:00 EST
861    Tag: leunga-20020303-mlrisc-tools
862    
863      Added #[ ... ] expressions to mlrisc tools
864    
865    ----------------------------------------------------------------------
866    Name: Matthias Blume
867    Date: 2002/02/27 12:29:00 EST
868    Tag: blume-20020227-cdebug
869    Description:
870    
871    - made types in structure C and C_Debug to be equal
872    - got rid of code duplication (c-int.sml vs. c-int-debug.sml)
873    - there no longer is a C_Int_Debug (C_Debug is directly derived from C)
874    
875    ----------------------------------------------------------------------
876    Name: Matthias Blume
877    Date: 2002/02/26 12:00:00 EST
878    Tag: blume-20020226-ffi
879    Description:
880    
881    1. Fixed a minor bug in CM's "noweb" tool:
882       If numbering is turned off, then truly don't number (i.e., do not
883       supply the -L option to noweb).  The previous behavior was to supply
884       -L'' -- which caused noweb to use the "default" line numbering scheme.
885       Thanks to Chris Richards for pointing this out (and supplying the fix).
886    
887    2. Once again, I reworked some aspects of the FFI:
888    
889       A. The incomplete/complete type business:
890    
891       - Signatures POINTER_TO_INCOMPLETE_TYPE and accompanying functors are
892         gone!
893       - ML types representing an incomplete type are now *equal* to
894         ML types representing their corresponding complete types (just like
895         in C).  This is still safe because ml-nlffigen will not generate
896         RTTI for incomplete types, nor will it generate functions that
897         require access to such RTTI.   But when ML code generated from both
898         incomplete and complete versions of the C type meet, the ML types
899         are trivially interoperable.
900    
901         NOTE:  These changes restore the full generality of the translation
902         (which was previously lost when I eliminated functorization)!
903    
904       B. Enum types:
905    
906       - Structure C now has a type constructor "enum" that is similar to
907         how the "su" constructor works.  However, "enum" is not a phantom
908         type because each "T enum" has values (and is isomorphic to
909         MLRep.Signed.int).
910       - There are generic access operations for enum objects (using
911         MLRep.Signed.int).
912       - ml-nlffigen will generate a structure E_foo for each "enum foo".
913         * The structure contains the definition of type "mlrep" (the ML-side
914         representation type of the enum).  Normally, mlrep is the same
915         as "MLRep.Signed.int", but if ml-nlffigen was invoked with "-ec",
916         then mlrep will be defined as a datatype -- thus facilitating
917         pattern matching on mlrep values.
918         ("-ec" will be suppressed if there are duplicate values in an
919          enumeration.)
920         * Constructors ("-ec") or values (no "-ec") e_xxx of type mlrep
921         will be generated for each C enum constant xxx.
922         * Conversion functions m2i and i2m convert between mlrep and
923         MLRep.Signed.int.  (Without "-ec", these functions are identities.)
924         * Coversion functions c and ml convert between mlrep and "tag enum".
925         * Access functions (get/set) fetch and store mlrep values.
926       - By default (unless ml-nlffigen was invoked with "-nocollect"), unnamed
927         enumerations are merged into one single enumeration represented by
928         structure E_'.
929    
930    ----------------------------------------------------------------------
931    Name: Allen Leung
932    Date: 2002/02/25 04:45:00 EST
933    Tag: leunga-20020225-cps-spill
934    
935    This is a new implementation of the CPS spill phase.
936    The new phase is in the new file compiler/CodeGen/cpscompile/spill-new.sml
937    In case of problems, replace it with the old file spill.sml
938    
939    The current compiler runs into some serious performance problems when
940    constructing a large record.  This can happen when we try to compile a
941    structure with many items.  Even a very simple structure like the following
942    makes the compiler slow down.
943    
944        structure Foo = struct
945           val x_1 = 0w1 : Word32.int
946           val x_2 = 0w2 : Word32.int
947           val x_3 = 0w3 : Word32.int
948           ...
949           val x_N = 0wN : Word32.int
950        end
951    
952    The following table shows the compile time, from N=1000 to N=4000,
953    with the old compiler:
954    
955    N
956    1000   CPS 100 spill                           0.04u  0.00s  0.00g
957           MLRISC ra                               0.06u  0.00s  0.05g
958              (spills = 0 reloads = 0)
959           TOTAL                                   0.63u  0.07s  0.21g
960    
961    1100   CPS 100 spill                           8.25u  0.32s  0.64g
962           MLRISC ra                               5.68u  0.59s  3.93g
963              (spills = 0 reloads = 0)
964           TOTAL                                   14.71u  0.99s  4.81g
965    
966    1500   CPS 100 spill                           58.55u  2.34s  1.74g
967           MLRISC ra                               5.54u  0.65s  3.91g
968              (spills = 543 reloads = 1082)
969           TOTAL                                   65.40u  3.13s  6.00g
970    
971    2000   CPS 100 spill                           126.69u  4.84s  3.08g
972           MLRISC ra                               0.80u  0.10s  0.55g
973              (spills = 42 reloads = 84)
974           TOTAL                                   129.42u  5.10s  4.13g
975    
976    3000   CPS 100 spill                           675.59u  19.03s  11.64g
977           MLRISC ra                               2.69u  0.27s  1.38g
978              (spills = 62 reloads = 124)
979           TOTAL                                   682.48u  19.61s  13.99g
980    
981    4000   CPS 100 spill                           2362.82u  56.28s  43.60g
982           MLRISC ra                               4.96u  0.27s  2.72g
983              (spills = 85 reloads = 170)
984           TOTAL                                   2375.26u  57.21s  48.00g
985    
986    As you can see the old cps spill module suffers from some serious
987    performance problem.  But since I cannot decipher the old code fully,
988    instead of patching the problems up, I'm reimplementing it
989    with a different algorithm.  The new code is more modular,
990    smaller when compiled, and substantially faster
991    (O(n log n) time and O(n) space).  Timing of the new spill module:
992    
993    4000  CPS 100 spill                           0.02u  0.00s  0.00g
994          MLRISC ra                               0.25u  0.02s  0.15g
995             (spills=1 reloads=3)
996          TOTAL                                   7.74u  0.34s  1.62g
997    
998    Implementation details:
999    
1000    As far as I can tell, the purpose of the CPS spill module is to make sure the
1001    number of live variables at any program point (the bandwidth)
1002    does not exceed a certain limit, which is determined by the
1003    size of the spill area.
1004    
1005    When the bandwidth is too large, we decrease the register pressure by
1006    packing live variables into spill records.  How we achieve this is
1007    completely different than what we did in the old code.
1008    
1009    First, there is something about the MLRiscGen code generator
1010    that we should be aware of:
1011    
1012    o MLRiscGen performs code motion!
1013    
1014       In particular, it will move floating point computations and
1015       address computations involving only the heap pointer to
1016       their use sites (if there is only a single use).
1017       What this means is that if we have a CPS record construction
1018       statement
1019    
1020           RECORD(k,vl,w,e)
1021    
1022       we should never count the new record address w as live if w
1023       has only one use (which is often the case).
1024    
1025       We should do something similar to floating point, but the transformation
1026       there is much more complex, so I won't deal with that.
1027    
1028    Secondly, there are now two new cps primops at our disposal:
1029    
1030     1. rawrecord of record_kind option
1031        This pure operator allocates some uninitialized storage from the heap.
1032        There are two forms:
1033    
1034         rawrecord NONE [INT n]  allocates a tagless record of length n
1035         rawrecord (SOME rk) [INT n] allocates a tagged record of length n
1036                                     and initializes the tag.
1037    
1038     2. rawupdate of cty
1039          rawupdate cty (v,i,x)
1040          Assigns to x to the ith component of record v.
1041          The storelist is not updated.
1042    
1043    We use these new primops for both spilling and increment record construction.
1044    
1045     1. Spilling.
1046    
1047        This is implemented with a linear scan algorithm (but generalized
1048        to trees).  The algorithm will create a single spill record at the
1049        beginning of the cps function and use rawupdate to spill to it,
1050        and SELECT or SELp to reload from it.  So both spills and reloads
1051        are fine-grain operations.  In contrast, in the old algorithm
1052        "spills" have to be bundled together in records.
1053    
1054        Ideally, we should sink the spill record construction to where
1055        it is needed.  We can even split the spill record into multiple ones
1056        at the places where they are needed.  But CPS is not a good
1057        representation for global code motion, so I'll keep it simple and
1058        am not attempting this.
1059    
1060     2. Incremental record construction (aka record splitting).
1061    
1062        Long records with many component values which are simulatenously live
1063        (recall that single use record addresses are not considered to
1064         be live) are constructed with rawrecord and rawupdate.
1065        We allocate space on the heap with rawrecord first, then gradually
1066        fill it in with rawupdate.  This is the technique suggested to me
1067        by Matthias.
1068    
1069        Some restrictions on when this is applicable:
1070        1. It is not a VECTOR record.  The code generator currently does not handle
1071           this case. VECTOR record uses double indirection like arrays.
1072        2. All the record component values are defined in the same "basic block"
1073           as the record constructor.  This is to prevent speculative
1074           record construction.
1075    
1076    ----------------------------------------------------------------------
1077    Name: Allen Leung
1078    Date: 2002/02/22 01:02:00 EST
1079    Tag: leunga-20020222-mlrisc-tools
1080    
1081    Minor bug fixes in the parser and rewriter
1082    
1083    ----------------------------------------------------------------------
1084    Name: Allen Leung
1085    Date: 2002/02/21 20:20:00 EST
1086    Tag: leunga-20020221-peephole
1087    
1088    Regenerated the peephole files.  Some contained typos in the specification
1089    and some didn't compile because of pretty printing bugs in the old version
1090    of 'nowhere'.
1091    
1092    ----------------------------------------------------------------------
1093    Name: Allen Leung
1094    Date: 2002/02/19 20:20:00 EST
1095    Tag: leunga-20020219-mlrisc-tools
1096    Description:
1097    
1098       Minor bug fixes to the mlrisc-tools library:
1099    
1100       1.  Fixed up parsing colon suffixed keywords
1101       2.  Added the ability to shut the error messages up
1102       3.  Reimplemented the pretty printer and fixed up/improved
1103           the pretty printing of handle and -> types.
1104       4.  Fixed up generation of literal symbols in the nowhere tool.
1105       5.  Added some SML keywords to to sml.sty
1106    
1107    ----------------------------------------------------------------------
1108    Name: Matthias Blume
1109    Date: 2002/02/19 16:20:00 EST
1110    Tag: blume-20020219-cmffi
1111    Description:
1112    
1113    A wild mix of changes, some minor, some major:
1114    
1115    * All C FFI-related libraries are now anchored under $c:
1116        $/c.cm      --> $c/c.cm
1117        $/c-int.cm  --> $c/internals/c-int.cm
1118        $/memory.cm --> $c/memory/memory.cm
1119    
1120    * "make" tool (in CM) now treats its argument pathname slightly
1121      differently:
1122        1. If the native expansion is an absolute name, then before invoking
1123           the "make" command on it, CM will apply OS.Path.mkRelative
1124           (with relativeTo = OS.FileSys.getDir()) to it.
1125        2. The argument will be passed through to subsequent phases of CM
1126           processing without "going native".  In particular, if the argument
1127           was an anchored path, then "make" will not lose track of that anchor.
1128    
1129    * Compiler backends now "know" their respective C calling conventions
1130      instead of having to be told about it by ml-nlffigen.  This relieves
1131      ml-nlffigen from one of its burdens.
1132    
1133    * The X86Backend has been split into X86CCallBackend and X86StdCallBackend.
1134    
1135    * Export C_DEBUG and C_Debug from $c/c.cm.
1136    
1137    * C type encoding in ml-nlffi-lib has been improved to model the conceptual
1138      subtyping relationship between incomplete pointers and their complete
1139      counterparts.  For this, ('t, 'c) ptr has been changed to 'o ptr --
1140      with the convention of instantiating 'o with ('t, 'c) obj whenever
1141      the pointer target type is complete.  In the incomplete case, 'o
1142      will be instantiated with some "'c iobj" -- a type obtained by
1143      using one of the functors PointerToIncompleteType or PointerToCompleteType.
1144    
1145      Operations that work on both incomplete and complete pointer types are
1146      typed as taking an 'o ptr while operations that require the target to
1147      be known are typed as taking some ('t, 'c) obj ptr.
1148    
1149      voidptr is now a bit "more concrete", namely "type voidptr = void ptr'"
1150      where void is an eqtype without any values.  This makes it possible
1151      to work on voidptr values using functions meant to operate on light
1152      incomplete pointers.
1153    
1154    * As a result of the above, signature POINTER_TO_INCOMPLETE_TYPE has
1155      been vastly simplified.
1156    
1157    ----------------------------------------------------------------------
1158    Name: Matthias Blume
1159    Date: 2002/02/19 10:48:00 EST
1160    Tag: blume-20020219-pqfix
1161    Description:
1162    
1163    Applied Chris Okasaki's bug fix for priority queues.
1164    
1165    ----------------------------------------------------------------------
1166    Name: Matthias Blume
1167    Date: 2002/02/15 17:05:00
1168    Tag: Release_110_39
1169    Description:
1170    
1171    Last-minute retagging is becoming a tradition... :-(
1172    
1173    This is the working release 110.39.
1174    
1175    ----------------------------------------------------------------------
1176    Name: Matthias Blume
1177    Date: 2002/02/15 16:00:00 EST
1178    Tag: Release_110_39-orig
1179    Description:
1180    
1181    Working release 110.39.  New bootfiles.
1182    
1183    (Update: There was a small bug in the installer so it wouldn't work
1184    with all shells.  So I retagged. -Matthias)
1185    
1186    ----------------------------------------------------------------------
1187    Name: Matthias Blume
1188    Date: 2002/02/15 14:17:00 EST
1189    Tag: blume-20020215-showbindings
1190    Description:
1191    
1192    Added EnvRef.listBoundSymbols and CM.State.showBindings.  Especially
1193    the latter can be useful for exploring what bindings are available at
1194    the interactive prompt.  (The first function returns only the list
1195    of symbols that are really bound, the second prints those but also the
1196    ones that CM's autoloading mechanism knows about.)
1197    
1198    ----------------------------------------------------------------------
1199    Name: Matthias Blume
1200    Date: 2002/02/15 12:08:00 EST
1201    Tag: blume-20020215-iptrs
1202    Description:
1203    
1204    Two improvements to ml-nlffigen:
1205    
1206      1. Write files only if they do not exist or if their current contents
1207         do not coincide with what's being written.  (That is, avoid messing
1208         with the time stamps unless absolutely necessary.)
1209    
1210      2. Implement a "repository" mechanism for generated files related
1211         to "incomplete pointer types".   See the README file for details.
1212    
1213    ----------------------------------------------------------------------
1214    Name: Matthias Blume
1215    Date: 2002/02/14 11:50:00 EST
1216    Tag: blume-20020214-quote
1217    Description:
1218    
1219    Added a type 't t_' to tag.sml (in ml-nlffi-lib.cm).  This is required
1220    because of the new and improved tag generation scheme.  (Thanks to Allen
1221    Leung for pointing it out.)
1222    
1223    ----------------------------------------------------------------------
1224    Name: Lal George
1225    Date: 2002/02/14 09:55:27 EST 2002
1226    Tag: george-20020214-isabelle-bug
1227    Description:
1228    
1229    Fixed the MLRISC bug sent by Markus Wenzel regarding the compilation
1230    of Isabelle on the x86.
1231    
1232    From Allen:
1233    -----------
1234     I've found the problem:
1235    
1236         in ra-core.sml, I use the counter "blocked" to keep track of the
1237         true number of elements in the freeze queue.  When the counter goes
1238         to zero, I skip examining the queue.  But I've messed up the
1239         bookkeeping in combine():
1240    
1241             else ();
1242             case !ucol of
1243               PSEUDO => (if !cntv > 0 then
1244                     (if !cntu > 0 then blocked := !blocked - 1 else ();
1245                                        ^^^^^^^^^^^^^^^^^^^^^^^
1246                      moveu := mergeMoveList(!movev, !moveu)
1247                     )
1248                  else ();
1249    
1250         combine() is called to coalesce two nodes u and v.
1251         I think I was thinking that if the move counts of u and v are both
1252         greater than zero then after they are coalesced then one node is
1253         removed from the freeze queue.  Apparently I was thinking that
1254         both u and v are of low degree, but that's clearly not necessarily true.
1255    
1256    
1257    02/12/2002:
1258        Here's the patch.  HOL now compiles.
1259    
1260        I don't know how this impact on performance (compile
1261        time or runtime).  This bug caused the RA (especially on the x86)
1262        to go thru the potential spill phase when there are still nodes on the
1263        freeze queue.
1264    
1265    
1266    
1267    
1268    ----------------------------------------------------------------------
1269    Name: Matthias Blume
1270    Date: 2002/02/13 22:40:00 EST
1271    Tag: blume-20020213-fptr-rtti
1272    Description:
1273    
1274    Fixed a bug in ml-nlffigen that was introduced with one of the previous
1275    updates.
1276    
1277    ----------------------------------------------------------------------
1278    Name: Matthias Blume
1279    Date: 2002/02/13 16:41:00 EST
1280    Tag: blume-20020213-cmlpq
1281    Description:
1282    
1283    Added new priority queue export symbols (which have just been added to
1284    smlnj-lib.cm) to CML's version of smlnj-lib.cm.  (Otherwise CML would
1285    not compile and the installer would choke.)
1286    
1287    ----------------------------------------------------------------------
1288    Name: Matthias Blume
1289    Date: 2002/02/13 16:15:00 EST
1290    Tag: blume-20020213-various
1291    Description:
1292    
1293    1. More tweaks to ml-nlffigen:
1294    
1295       - better internal datastructures (resulting in slight speedup)
1296       - "-match" option requires exact match
1297       - "localized" gensym counters (untagged structs/unions nested within
1298         other structs/unions or within typedefs get a fresh counter; their
1299         tag will be prefixed by a concatenation of their parents' tags)
1300       - bug fixes (related to calculation of transitive closure of types
1301         to be included in the output)
1302    
1303    2. Minor Basis updates:
1304    
1305       - added implementations for List.collate and Option.app
1306    
1307    ----------------------------------------------------------------------
1308    Name: Matthias Blume
1309    Date: 2002/02/11 15:55:00 EST
1310    Tag: blume-20020211-gensym
1311    Description:
1312    
1313    Added a "-gensym" option to command line of ml-nlffigen.  This can be
1314    used to specify a "stem" -- a string that is inserted in all "gensym'd"
1315    names (ML structure names that correspond to unnamed C structs, unions,
1316    and enums), so that separate runs of ml-nlffigen do not clash.
1317    
1318    ----------------------------------------------------------------------
1319    Name: Matthias Blume
1320    Date: 2002/02/11 12:05:00 EST
1321    Tag: blume-20020211-gensml
1322    Description:
1323    
1324    A quick fix for a problem with GenSML (in the pgraph-util library):
1325    Make generation of toplevel "local" optional.  (Strictly speaking,
1326    signature definitions within "local" are not legal SML.)
1327    
1328    Other than that: updates to INSTALL and cm/TODO.
1329    
1330    ----------------------------------------------------------------------
1331    Name: Matthias Blume
1332    Date: 2002/02/08 15:00:00 EST
1333    Tag: blume-20020208-uniquepid
1334    Description:
1335    
1336    0. Version number has been bumped to 110.38.1.  NEW BOOTFILES!!!
1337    
1338    1. The installer (config/install.sh) has gotten smarter:
1339    
1340         - Configuration options are a bit easier to specify now
1341           (in config/targets).
1342         - Bug in recognizing .tar.bz2 files fixed.
1343         - Installer automatically resolves dependencies between
1344           configuration options (e.g., if you ask for eXene, you will
1345           also get cml -- regardless whether you asked for it or not).
1346         - Installer can run in "quieter mode" by setting the environment
1347           variable INSTALL_QUIETLY to "true".  "Quieter" does not mean
1348           "completely silent", though.
1349         - Build HashCons library as part of smlnj-lib.
1350    
1351    2. A new scheme for assigning persistent identifiers to compilation
1352       units (and, by extension, to types etc.) has been put into place.
1353       This fixes a long-standing bug where types and even dynamic values
1354       can get internally confused, thereby compromising type safety
1355       (abstraction) and dynamic correctness.  See
1356    
1357         http://cm.bell-labs.com/cm/cs/who/blume/pid-confusion.tgz
1358    
1359       for an example of how things could go wrong until now.
1360    
1361       The downside of the new scheme is that pids are not quite as
1362       persistent as they used to be: CM will generate a fresh pid
1363       for every compilation unit that it thinks it sees for the first
1364       time.  That means that if you compile starting from a clean, fresh
1365       source tree at two different times, you end up with different
1366       binaries.
1367    
1368       Cutoff recompilation, however, has not been compromised because
1369       CM keeps pid information in special caches between runs.
1370    
1371    ----------------------------------------------------------------------
1372    Name: Lal George
1373    Date: 2002/02/07 15:34:13 EST 2002
1374    Tag: <none>
1375    Description:
1376    
1377    Compilers that generate assembly code may produce  global labels
1378    whose value is resolved at link time. The various peephole optimization
1379    modules did not take this in account.
1380    
1381    TODO. The Labels.addrOf function should really return an option
1382    type so that clients are forced to deal with this issue, rather
1383    than an exception being raised.
1384    
1385    ----------------------------------------------------------------------
1386    Name: Lal George
1387    Date: 2002/02/06 13:55:02 EST
1388    Tag: george-20020206-ra-breakup
1389    Description:
1390    
1391    1. A bug fix from Allen.
1392    
1393        A typo causes extra fstp %st(0)'s to be generated at compensation
1394        edges, which might cause stack underflow traps at runtime.  This
1395        occurs in fft where there are extraneous fstps right before the 'into'
1396        trap instruction (in this case they are harmless since none of the
1397        integers overflow.)
1398    
1399    2. Pulled out various utility modules that were embedded in the modules
1400       of the register allocator. I need these modules for other purposes, but
1401       they are not complete enough to put into a library (just yet).
1402    ----------------------------------------------------------------------
1403    Name: Matthias Blume
1404    Date: 2002/01/31 16:05:00 EST
1405    Tag: blume-20020131-sparc-ccalls
1406    Description:
1407    
1408    1. C-calls on Sparc needlessly allocated a huge chunk (96 bytes)
1409       of extra stack space by mistake.  Fixed.
1410    
1411    2. Bug in logic of handling of command-line options in ml-nlffigen fixed.
1412    
1413    ----------------------------------------------------------------------
1414    Name: Allen Leung
1415    Date: 2002/01/30
1416    Tag: leunga-20020130-nowhere-bug-fix
1417    Description:
1418    
1419       MLRISC bug fixes:
1420       1. Fixed a bindings computation bug in the 'nowhere' program generator tool.
1421       2. MachineInt.fromString was negating its value.
1422    
1423    ----------------------------------------------------------------------
1424    Name: Matthias Blume
1425    Date: 2002/01/29
1426    Tag: blume-20020129-INSTALL
1427    Description:
1428    
1429    - Added somewhat detailed installation instructions (file INSTALL).
1430    - Fixed curl-detection bug in config/install.sh.
1431    - It is now possible to select the URL getter using the URLGETTER
1432      environment variable:
1433    
1434          not set / "unknown"      --> automatic detection (script tries wget,
1435                                       curl, and lynx)
1436          "wget" / "curl" / "lynx" --> use the specified program (script "knows"
1437                                       how to properly invoke them)
1438          other                    --> use $URLGETTER directly, it must take
1439                                       precisely two command-line arguments
1440                                       (source URL and destination file name)
1441    
1442    ----------------------------------------------------------------------
1443    Name: Matthias Blume
1444    Date: 2002/01/28
1445    Tag: blume-20020128-sparc-ccalls
1446    Description:
1447    
1448    - Fixed problem with calculation of "used" registers in sparc-c-calls.
1449    - Make use of the allocParam argument in sparc-c-calls.
1450    
1451    ----------------------------------------------------------------------
1452    Name: Matthias Blume
1453    Date: 2002/01/28
1454    Tag: blume-20020128-allocParam
1455    Description:
1456    
1457    John Reppy:  Changes c-calls API to accept client-callback for
1458    allocating extra stack space.
1459    me: Corresponding changes to mlriscGen (using a dummy argument that
1460        does not change the current behavior).
1461    
1462    ----------------------------------------------------------------------
1463    Name: Matthias Blume
1464    Date: 2002/01/28 12:00:00
1465    Tag: Release_110_38
1466    Description:
1467    
1468    This time for real!!!
1469    
1470    ----------------------------------------------------------------------
1471    Name: Matthias Blume
1472    Date: 2002/01/28 10:56:00 EST
1473    Tag: blume-20020128-retraction
1474    Description:
1475    
1476    0. Retracted earlier 110.38.  (The Release_110_38 tag has been replaced
1477       with blume-Release_110_38-retracted.)
1478    
1479    1. Fixed a problem with incorrect rounding modes in real64.sml.
1480       (Thanks to Andrew Mccreight <andrew.mccreight@yale.edu>.)
1481    
1482    2. A bug in ml-nlffigen related to the handling of unnamed structs, unions,
1483       and enums fixed.  The naming of corresponding ML identifiers should
1484       now be consistent again.
1485    
1486    ----------------------------------------------------------------------
1487    Name: Allen Leung
1488    Date: 2002/01/27
1489    Tag: leunga-20020127-nowhere
1490    Description:
1491    
1492       Added a target called nowhere in the configuration scripts.
1493       Enabling this will build the MLRISC 'nowhere' tool (for translating
1494       programs with where-clauses into legal SML code) during installation.
1495    
1496    ----------------------------------------------------------------------
1497    Name: Matthias Blume
1498    Date: 2002/01/25 21:27:00 EST
1499    Tag: blume-Release_110_38-retracted
1500    Description:
1501    
1502    Call it a (working) release!  Version is 110.38. Bootfiles are ready.
1503    
1504    README will be added later.
1505    
1506    !!! NOTE:  Re-tagged as blume-Release_110_38-retracted. Original tag
1507    (Release_110_38) removed.  Reason: Last-minute bug fixes.
1508    
1509    ----------------------------------------------------------------------
1510    Name: Matthias Blume
1511    Date: 2002/01/25
1512    Tag: blume-20020125-ffi
1513    Description:
1514    
1515    A large number of tweaks and improvements to ml-nlffi-lib and
1516    ml-nlffigen:
1517    
1518       - ML represenation types have been streamlined
1519       - getter and setter functions work with concrete values, not abstract
1520         ones where possible
1521       - ml-nlffigen command line more flexible (see README file there)
1522       - some bugs have been fixed (hopefully)
1523    
1524    ----------------------------------------------------------------------
1525    Name: Lal George
1526    Date: 2002/01/24
1527    Tag: george-20020124-risc-ra-interface
1528    Description:
1529    
1530       There is a dramatic simplification in the interface to the
1531       register allocator for RISC architectures as a result of making
1532       parallel copy instructions explicit.
1533    
1534    ----------------------------------------------------------------------
1535    Name: Matthias Blume
1536    Date: 2002/01/22
1537    Tag: blume-20020122-x86-ccalls
1538    Description:
1539    
1540    Bug fix for c-calls on x86 (having to do with how char- and
1541    short-arguments are being handled).
1542    
1543    ----------------------------------------------------------------------
1544    Name: Matthias Blume
1545    Date: 2002/01/21
1546    Tag: blume-20020121-ff
1547    Description:
1548    
1549    Another day of fiddling with the FFI...
1550    
1551    1. Bug fix/workaround:  CKIT does not complain about negative array
1552       dimensions, so ml-nlffigen has to guard itself against this possibility.
1553       (Otherwise a negative dimension would send it into an infinite loop.)
1554    
1555    2. Some of the abstract types (light objects, light pointers, most "base"
1556       types) in structure C are now eqtypes.
1557    
1558    3. Added constructors and test functions for NULL function pointers.
1559    
1560    ----------------------------------------------------------------------
1561    Name: Matthias Blume
1562    Date: 2002/01/18
1563    Tag: blume-20020118-ready-for-new-release
1564    Description:
1565    
1566    Made config/srcarchiveurl point to a new place.  (Will provide boot
1567    files shortly.)
1568    
1569    Maybe we christen this to be 110.38?
1570    
1571    ----------------------------------------------------------------------
1572    Name: Matthias Blume
1573    Date: 2002/01/18
1574    Tag: blume-20020118-more-ffifiddle
1575    Description:
1576    
1577    Today's FFI fiddling:
1578    
1579      - Provided a structure CGetSet with "convenient" versions of C.Get.* and
1580        C.Set.* that use concrete (MLRep.*) arguments and results instead
1581        of abstract ones.
1582    
1583      - Provided word-style bit operations etc. for "int" representation
1584        types in MLRep.S<Foo>Bitops where <Foo> ranges over Char, Int, Short,
1585        and Long.
1586    
1587    ----------------------------------------------------------------------
1588    Name: Matthias Blume
1589    Date: 2002/01/18
1590    Tag: blume-20020118-use-x86-fp
1591    Description:
1592    
1593    Now that x86-fast-fp seems to be working, I turned it back on again
1594    by default.  (Seems to work fine now, even with the FFI.)
1595    
1596    Other than that, I added some documentation about the FFI to
1597    src/ml-nlffigen/README and updated the FFI test examples in
1598    src/ml-nlffi-lib/Tests/*.
1599    
1600    ----------------------------------------------------------------------
1601    Name: Allen Leung
1602    Date: 2002/01/17
1603    Tag: leunga-20020117-x86-fast-fp-call
1604    Description:
1605    
1606       1. Fixed a problem with handling return fp values when x86's fast fp
1607          mode is turned on.
1608    
1609       2. Minor pretty printing fix for cellset.  Print %st(0) as %st(0) instead
1610          of %f32.
1611    
1612       3. Added a constructor INT32lit to the ast of MLRISC tools.
1613    
1614    ----------------------------------------------------------------------
1615    Name: Matthias Blume
1616    Date: 2002/01/16
1617    Tag: blume-20020116-ffifiddle
1618    Description:
1619    
1620    More fiddling with the FFI interface:
1621    
1622     - Make constness 'c instead of rw wherever possible.  This eliminates
1623       the need for certain explicit coercions.  (However, due to ML's
1624       value polymorphism, there will still be many cases where explicit
1625       coercions are necessary.  Phantom types are not the whole answer
1626       to modeling a subtyping relationship in ML.)
1627    
1628     - ro/rw coersions for pointers added.  (Avoids the detour through */&.)
1629    
1630     - "printf" test example added to src/ml-nlffi-lib/Tests.  (Demonstrates
1631       clumsy workaround for varargs problem.)
1632    
1633    ----------------------------------------------------------------------
1634    Name: Lal George
1635    Date: 2002/01/15
1636    Tag: <none>
1637    Description:
1638    
1639    1. Since COPY instructions are no longer native to the architecture,
1640       a generic functor can be used to implement the expandCopies function.
1641    
1642    2. Allowed EXPORT and IMPORT pseudo-op declarations to appear inside a
1643       TEXT segment.
1644    
1645    ----------------------------------------------------------------------
1646    Name: Matthias Blume
1647    Date: 2002/01/15
1648    Tag: blume-20020115-ffiupdates
1649    Description:
1650    
1651    1. Fix for bug resulting in single-precision float values being returned
1652       incorrectly from FFI calls.
1653    
1654    2. Small modifications to C FFI API:
1655    
1656        - memory-allocation routines return straight objects (no options)
1657          and raise an exception in out-of-memory situations
1658        - unsafe extensions to cast between function pointers and pointers
1659          from/to ints
1660        - added structure C_Debug as an alternative to structure C where
1661          pointer-dereferencing (|*| and |*!) always check for null-pointers
1662        - added open_lib' to DynLinkage;  open_lib' works like open_lib
1663          but also takes a (possibly empty) list of existing library handles
1664          that the current library depends on
1665    
1666    ----------------------------------------------------------------------
1667    Name: Matthias Blume
1668    Date: 2002/01/10
1669    Tag: blume-20020110-newffigen
1670    Description:
1671    
1672    1. Updates to portable graph code.
1673    
1674    2. Major update to ml-nlffigen and ml-nlffi-lib.  Things are much
1675       more scalable now so that even huge interfaces such as the one
1676       for GTK compile in finite time and space. :-)
1677       See src/ml-nlffigen/README for details on what's new.
1678    
1679    ----------------------------------------------------------------------
1680    Name: Lal George
1681    Date: 2001/01/09 14:31:35 EST 2002
1682    Tag: george-20011206-rm-native-copy
1683    Description:
1684    
1685            Removed the native COPY and FCOPY instructions
1686            from all the architectures and replaced it with the
1687            explicit COPY instruction from the previous commit.
1688    
1689            It is now possible to simplify many of the optimizations
1690            modules that manipulate copies. This has not been
1691            done in this change.
1692    
1693    ----------------------------------------------------------------------
1694    Name: Lal George
1695    Date: 2001/12/06 16:50:13 EST 2001
1696    Tag: george-20011206-mlrisc-instruction
1697    Description:
1698    
1699    Changed the representation of instructions from being fully abstract
1700    to being partially concrete. That is to say:
1701    
1702      from
1703            type instruction
1704    
1705      to
1706            type instr                              (* machine instruction *)
1707    
1708            datatype instruction =
1709                LIVE of {regs: C.cellset, spilled: C.cellset}
1710              | KILL of {regs: C.cellset, spilled: C.cellset}
1711              | COPYXXX of {k: CB.cellkind, dst: CB.cell list, src: CB.cell list}
1712              | ANNOTATION of {i: instruction, a: Annotations.annotation}
1713              | INSTR of instr
1714    
1715    This makes the handling of certain special instructions that appear on
1716    all architectures easier and uniform.
1717    
1718    LIVE and KILL say that a list of registers are live or killed at the
1719    program point where they appear. No spill code is generated when an
1720    element of the 'regs' field is spilled, but the register is moved to
1721    the 'spilled' (which is present, more for debugging than anything else).
1722    
1723    LIVE replaces the (now deprecated) DEFFREG instruction on the alpha.
1724    We used to generate:
1725    
1726            DEFFREG f1
1727            f1 := f2 + f3
1728            trapb
1729    
1730    but now generate:
1731    
1732            f1 := f2 + f3
1733            trapb
1734            LIVE {regs=[f1,f2,f3], spilled=[]}
1735    
1736    Furthermore, the DEFFREG (hack) required that all floating point instruction
1737    use all registers mentioned in the instruction. Therefore f1 := f2 + f3,
1738    defines f1 and uses [f1,f2,f3]! This hack is no longer required resulting
1739    in a cleaner alpha implementation. (Hopefully, intel will not get rid of
1740    this architecture).
1741    
1742    COPYXXX is intended to replace the parallel COPY and FCOPY  available on
1743    all the architectures. This will result in further simplification of the
1744    register allocator that must be aware of them for coalescing purposes, and
1745    will also simplify certain aspects of the machine description that provides
1746    callbacks related to parallel copies.
1747    
1748    ANNOTATION should be obvious, and now INSTR represents the honest to God
1749    machine instruction set!
1750    
1751    The <arch>/instructions/<arch>Instr.sml files define certain utility
1752    functions for making porting easier -- essentially converting upper case
1753    to lower case. All machine instructions (of type instr) are in upper case,
1754    and the lower case form generates an MLRISC instruction. For example on
1755    the alpha we have:
1756    
1757      datatype instr =
1758         LDA of {r:cell, b:cell, d:operand}
1759       | ...
1760    
1761      val lda : {r:cell, b:cell, d:operand} -> instruction
1762        ...
1763    
1764    where lda is just (INSTR o LDA), etc.
1765    
1766    ----------------------------------------------------------------------
1767    Name: Matthias Blume
1768    Date: 2001/11/22 21:40:00 EST
1769    Tag: Release_110_37
1770    Description:
1771    
1772    Release 110.37.  This time for real.
1773    
1774    ----------------------------------------------------------------------
1775    Name: Matthias Blume
1776    Date: 2001/11/21 16:35:00 EST
1777    Tag: blume-20011121-foot-in-mouth
1778    Description:
1779    
1780    Removed the "Release_110_37" tag because of a serious bug.
1781    This will be re-tagged once the bug is fixed.
1782    
1783    ----------------------------------------------------------------------
1784    Name: Matthias Blume
1785    Date: 2001/11/21 16:14:00 EST
1786    Tag: blume-20011121-forgottenfile
1787    Description:
1788    
1789    Forgot to add a file.  (Just a .tex-file -- part of
1790    the CM manual source.)
1791    
1792    ----------------------------------------------------------------------
1793    Name: Matthias Blume
1794    Date: 2001/11/21 16:10:00 EST
1795    Tag: blume-20011121-invalid_110_37
1796    Description:
1797    
1798    Note: I removed the original tag "Release_110_37" from this commit
1799          because we found a serious bug in all non-x86 backends.
1800          - Matthias
1801    
1802    1. Modifications to the SML/NJ code generator and to the runtime system
1803       so that code object name strings are directly inserted into code
1804       objects at code generation time.  The only business the runtime system
1805       has with this is now to read the name strings on occasions.
1806       (The encoding of the name string has also changed somewhat.)
1807    
1808    2. CM now implements a simple "set calculus" for specifying export lists.
1809       In particular, it is now possible to refer to the export lists of
1810       other libraries/groups/sources and form unions as well as differences.
1811       See the latest CM manual for details.
1812    
1813    3. An separate notion of "proxy" libraries has again be eliminated from
1814       CM's model.  (Proxy libraries are now simply a special case of using
1815       the export list calculus.)
1816    
1817    4. Some of the existing libraries now take advantage of the new set
1818       calculus.
1819       (Notice that not all libraries have been converted because some
1820       of the existing .cm-files are supposed to be backward compatible
1821       with 110.0.x.)
1822    
1823    5. Some cleanup in stand-alone programs.  (Don't use "exnMessage" -- use
1824       "General.exnMessage"!  The former relies on a certain hook to be
1825       initialized, and that often does not happen in the stand-alone case.)
1826    
1827    ----------------------------------------------------------------------
1828    Name: Lal George
1829    Date: 2001/11/21  13:56:18 EST
1830    Tag: george-2001121-pseudo-ops
1831    Description:
1832    
1833      Implemented a complete redesign of MLRISC pseudo-ops. Now there
1834      ought to never be any question of incompatabilities with
1835      pseudo-op syntax expected by host assemblers.
1836    
1837      For now, only modules supporting GAS syntax are implemented
1838      but more should follow, such as MASM, and vendor assembler
1839      syntax, e.g. IBM as, Sun as, etc.
1840    
1841    ----------------------------------------------------------------------
1842    Name: Matthias Blume
1843    Date: 2001/11/14 11:52:00 EST
1844    Tag: blume-20011114-srcname
1845    Description:
1846    
1847    1. Routed the name of the current source file to mlriscgen where it
1848       should be directly emitted into the code object.  (This last part
1849       is yet to be done.)
1850    
1851    2. Some cleanup of the pgraph code to make it match the proposal that
1852       I put out the other day.  (The proposal notwithstanding, things are
1853       still in flux here.)
1854    
1855    ----------------------------------------------------------------------
1856    Name: Lal George
1857    Date: 2001/11/14 09:44:04 EST
1858    Tag:
1859    Description:
1860    
1861      Fix for a backpatching bug reported by Allen.
1862    
1863      Because the boundary between short and long span-dependent
1864      instructions is +/- 128, there are an astounding number of
1865      span-dependent instructions whose size is over estimated.
1866    
1867      Allen came up with the idea of letting the size of span
1868      dependent instructions be non-monotonic, for a maxIter
1869      number of times, after which the size must be monotonically
1870      increasing.
1871    
1872      This table shows the number of span-dependent instructions
1873      whose size was over-estimated as a function of maxIter, for the
1874      file Parse/parse/ml.grm.sml:
1875    
1876         maxIter            # of instructions:
1877            10                      687
1878            20                      438
1879            30                      198
1880            40                        0
1881    
1882      In compiling the compiler, there is no significant difference in
1883      compilation speed between maxIter=10 and maxIter=40. Actually,
1884      my measurements showed that maxIter=40 was a tad faster than
1885      maxIter=10! Also 96% of the  files in the compiler reach a fix
1886      point within 13 iterations, so fixing maxIter at 40, while high,
1887      is okay.
1888    
1889    ----------------------------------------------------------------------
1890    Name: Matthias Blume
1891    Date: 2001/10/31 15:25:00 EST
1892    Tag: blume-20011031-pgraph
1893    Description:
1894    
1895    CKIT:
1896    * Changed the "Function" constructor of type Ast.ctype to carry optional
1897      argument identifiers.
1898    * Changed the return type of TypeUtil.getFunction accordingly.
1899    * Type equality ignores the argument names.
1900    * TypeUtil.composite tries to preserve argument names but gives up quickly
1901      if there is a mismatch.
1902    
1903    installation script:
1904    * attempts to use "curl" if available (unless "wget" is available as well)
1905    
1906    CM:
1907    * has an experimental implementation of "portable graphs" which I will
1908      soon propose as an implementation-independent library format
1909    * there are also new libraries $/pgraph.cm and $/pgraph-util.cm
1910    
1911    NLFFI-LIB:
1912    * some cleanup (all cosmetic)
1913    
1914    NLFFIGEN:
1915    * temporarily disabled the mechanism that suppresses ML output for
1916      C definitions whose identifiers start with an underscore character
1917    * generate val bindings for enum constants
1918    * user can request that only one style (light or heavy) is being used;
1919      default is to use both (command-line arguments: -heavy and -light)
1920    * fixed bug in handling of function types involving incomplete pointers
1921    * generate ML entry points that take record arguments (i.e., using
1922      named arguments) for C functions that have a prototype with named
1923      arguments
1924      (see changes to CKIT)
1925    
1926    ----------------------------------------------------------------------
1927    Name: Allen Leung
1928    Date: 2001/10/27 20:34:00 EDT
1929    Tag: leunga-20011027-x86-fast-fp-call
1930    Description:
1931    
1932       Fixed the bug described in blume-20010920-slowfp.
1933    
1934       The fix involves
1935          1. generating FCOPYs in FSTP in ia32-svid
1936          2. marking a CALL with the appropriate annotation
1937    
1938    ----------------------------------------------------------------------
1939    Name: Matthias Blume
1940    Date: 2001/10/16 11:32:00 EDT
1941    Tag: blume-20011016-netbsd
1942    Description:
1943    
1944    Underscore patch from Chris Richards (fixing problem with compiling
1945    runtime system under recent NetBSD).
1946    
1947    ----------------------------------------------------------------------
1948    Name: Allen Leung
1949    Date: 2001/10/12 17:18:32 EDT 2001
1950    Tag: leung-20011012-x86-printflowgraph
1951    Description:
1952    
1953    X86RA now uses a valid (instead of dummy) PrintFlowgraph module.
1954    
1955    ----------------------------------------------------------------------
1956    Name: Lal George
1957    Date: 2001/10/11 23:51:34 EDT
1958    Tag: george-20011011-too-many-instrs
1959    Description:
1960    
1961    The representation of a program point never expected to see more
1962    than 65536 instructions in a basic block!
1963    
1964    ----------------------------------------------------------------------
1965    Name: Lal George
1966    Date: 2001/10/09 09:41:37 EDT
1967    Tag: george-20011008-mlrisc-labels
1968    Description:
1969    
1970    Changed the machine description files to support printing of
1971    local and global labels in assembly code, based on host assembler
1972    conventions.
1973    
1974    ----------------------------------------------------------------------
1975    Name: Matthias Blume
1976    Date: 2001/09/25 15:25:00 EDT
1977    Tag: blume-20010925-exninfo
1978    Description:
1979    
1980    I provided a non-hook implementation of exnName (at the toplevel) and
1981    made the "dummy" implementation of exnMessage (at the toplevel) more
1982    useful: if nothing gets "hooked in", then at least you are going to
1983    see the exception name and a message indicating why you don't see more.
1984    
1985    [For the time being, programs that need exnMessage and want to use
1986    ml-build should either use General.exnMessage (strongly recommended) or
1987    refer to structure General at some other point so that CM sees a
1988    static dependency.]
1989    
1990    [Similar remarks go for "print" and "use":  If you want to use their
1991    functionality in stand-alone programs generated by ml-build, then use
1992    TextIO.output and Backend.Interact.useFile (from $smlnj/compiler.cm).]
1993    
1994    ----------------------------------------------------------------------
1995    Name: Matthias Blume
1996    Date: 2001/09/20 17:28:00 EDT
1997    Tag: blume-20010920-slowfp
1998    Description:
1999    
2000    Allen says that x86-fast-fp is not safe yet, so I turned it off again...
2001    
2002    ----------------------------------------------------------------------
2003    Name: Matthias Blume
2004    Date: 2001/09/20 17:20:00 EDT
2005    Tag: blume-20010920-canonicalpaths
2006    Description:
2007    
2008    0. Updated the BOOT file (something that I forgot to do earlier).
2009    
2010    1. Small internal change to CM so that it avoids "/../" in filenames
2011       as much as possible (but only where it is safe).
2012    
2013    2. Changed config/_run-sml (resulting in a changed bin/.run-sml) so
2014       that arguments that contain delimiters are passed through correctly.
2015       This change also means that all "special" arguments of the form
2016       @SMLxxx... must come first.
2017    
2018    3. Changed install script to put relative anchor names for tool commands
2019       into pathconfig.
2020    
2021    ----------------------------------------------------------------------
2022    Name: Matthias Blume
2023    Date: 2001/09/18 15:35:00 EDT
2024    Tag: blume-20010918-readme11036
2025    Description:
2026    
2027    Added README files.
2028    
2029    ----------------------------------------------------------------------
2030    Name: Matthias Blume
2031    Date: 2001/09/18 11:45:00 EDT
2032    Tag: Release_110_36 (retag)
2033    Description:
2034    
2035    Fixed mistake in config/preloads. Retagged as 110.36.
2036    
2037    ----------------------------------------------------------------------
2038    Name: Matthias Blume
2039    Date: 2001/09/18 09:40:00 EDT
2040    Tag: Release_110_36_orig (tag changed)
2041    Description:
2042    
2043    New version (110.36).  New bootfiles.
2044    
2045    ----------------------------------------------------------------------
2046    Name: Matthias Blume
2047    Date: 2001/09/14 16:15:00 EDT
2048    Tag: blume-20010914-x86fastfp
2049    Description:
2050    
2051    John committed some changes that Allen made, in particular a (hopefully)
2052    correctly working version of the x86-fp module.
2053    
2054    I changed the default setting of the Control.MLRISC.getFlag "x86-fast-fp"
2055    flag to "true".  Everything seems to compile to a fixpoint ok, and
2056    "mandelbrot" speeds up by about 15%.
2057    
2058    ----------------------------------------------------------------------
2059    Name: Matthias Blume
2060    Date: 2001/09/13 11:20:00 EDT
2061    Tag: blume-20010913-minimal
2062    Description:
2063    
2064    1. Stefan Monnier's patch to fix a miscompilation problem that
2065       was brought to light by John Reppy's work on Moby.
2066    
2067    2. Implemented a minimal "structure Compiler" that contains just
2068       "version" and "architecture".  The minimal version will be
2069       available when the full version is not.  This is for backward-
2070       compatibility with code that wants to test Compiler.version.
2071    
2072    ----------------------------------------------------------------------
2073    Name: Matthias Blume
2074    Date: 2001/08/28 14:03:00 EDT
2075    Tag: blume-20010828-ml-lex
2076    Description:
2077    
2078    Fix for bug 1581, received from Neophytos Michael.
2079    
2080    ----------------------------------------------------------------------
2081    Name: Matthias Blume
2082    Date: 2001/08/27 11:20:00 EDT
2083    Tag: blume-20010827-readme11035
2084    Description:
2085    
2086    Fleshed out the README file for 110.35.
2087    
2088    ----------------------------------------------------------------------
2089    Name: Matthias Blume
2090    Date: 2001/08/24 17:10:00 EDT
2091    Tag: Release_110_35
2092    Description:
2093    
2094    New version number (110.35).  New bootfiles.
2095    
2096    ----------------------------------------------------------------------
2097    Name: Lal George
2098    Date: 2001/08/24 13:47:18 EDT 2001
2099    Tag: george-20010824-MLRISC-graphs
2100    Description:
2101    
2102     removed clusters from MLRISC completely and replaced with graphs.
2103    
2104    ----------------------------------------------------------------------
2105    Name: Matthias Blume
2106    Date: 2001/08/23 17:50:00 EDT
2107    Tag: blume-20010823-toplevel
2108    Description:
2109    
2110    - some reorganization of the code that implements various kinds of
2111      environments in the compiler (static, dynamic, symbolic, combined)
2112    - re-implemented the EnvRef module so that evalStream works properly
2113      (if the stream contains references to "use", "CM.make", etc.)
2114    - cleaned up evalloop.sml and interact.sml (but they need more cleaning)
2115    
2116    ----------------------------------------------------------------------
2117    Name: Matthias Blume
2118    Date: 2001/08/20 15:50 EDT
2119    Tag: blume20010820-slipup
2120    Description:
2121    
2122    I forgot to commit a few files.  Here they are...
2123    
2124    ----------------------------------------------------------------------
2125    Name: Matthias Blume
2126    Date: 2001/08/20 15:35:00 EDT
2127    Tag: blume-20010820-debugprof
2128    Description:
2129    
2130    !!!! NEW BOOTFILES !!!!
2131    
2132    This is another round of reorganizing the compiler sources.  This
2133    time the main goal was to factor out all the "instrumentation"
2134    passes (for profiling and backtracing) into their own library.
2135    The difficulty was to do it in such a way that it does not depend
2136    on elaborate.cm but only on elabdata.cm.
2137    
2138    Therefore there have been further changes to both elaborate.cm and
2139    elabdata.cm -- more "generic" things have been moved from the former
2140    to the latter.  As a result, I was forced to split the assignment
2141    of numbers indicating "primtyc"s into two portions: SML-generic and
2142    SML/NJ-specific.  Since it would have been awkward to maintain,
2143    I bit the bullet and actually _changed_ the mapping between these
2144    numbers and primtycs.  The bottom line of this is that you need
2145    a new set of bin- and bootfiles.
2146    
2147    I have built new bootfiles for all architectures, so doing a fresh
2148    checkout and config/install.sh should be all you need.
2149    
2150    The newly created library's name is
2151    
2152        $smlnj/viscomp/debugprof.cm
2153    
2154    and its sources live under
2155    
2156        src/compiler/DebugProf
2157    
2158    ----------------------------------------------------------------------
2159    Name: Matthias Blume
2160    Date: 2001/08/15 17:15:00 EDT
2161    Tag: blume-20010815-compreorg
2162    Description:
2163    
2164    This is a first cut at reorganizing the CM libraries that make up the
2165    core of the compiler.  The idea is to separate out pieces that could
2166    be used independently by tools, e.g., the parser, the typechecker, etc.
2167    
2168    The current status is a step in this direction, but it is not quite
2169    satisfactory yet.  Expect more changes in the future.
2170    
2171    Here is the current (new) organization...
2172    
2173        What used to be $smlnj/viscomp/core.cm is now divided into
2174        six CM libraries:
2175    
2176             $smlnj/viscomp/basics.cm
2177                           /parser.cm
2178                           /elabdata.cm
2179                           /elaborate.cm
2180                           /execute.cm
2181                           /core.cm
2182    
2183        The CM files for these libraries live under src/system/smlnj/viscomp.
2184        All these libraries are proxy libraries that contain precisely
2185        one CM library component.  Here are the locations of the components
2186        (all within the src/compiler tree):
2187    
2188             Basics/basics.cm
2189             Parse/parser.cm
2190             ElabData/elabdata.cm
2191             Elaborator/elaborate.cm
2192             Execution/execute.cm
2193             core.cm
2194    
2195         [This organization is the same that has been used already
2196         for a while for the architecture-specific parts of the visible
2197         compiler and for the old version of core.cm.]
2198    
2199         As you will notice, many source files have been moved from their
2200         respective original locations to a new home in one of the above
2201         subtrees.
2202    
2203         The division of labor between the new libraries is the following:
2204    
2205             basics.cm:
2206                - Simple, basic definitions that pertain to many (or all) of
2207                  the other libraries.
2208             parser.cm:
2209                - The SML parser, producing output of type Ast.dec.
2210                - The type family for Ast is also defined and exported here.
2211             elabdata.cm:
2212                - The datatypes that describe input and output of the elaborator.
2213                  This includes types, absyn, and static environments.
2214             elaborator.cm:
2215                - The SML/NJ type checker and elaborator.
2216                  This maps an Ast.dec (with a given static environment) to
2217                  an Absyn.dec (with a new static environment).
2218                - This libraries implements certain modules that used to be
2219                  structures as functors (to remove dependencies on FLINT).
2220             execute.cm:
2221                - Everything having to do with executing binary code objects.
2222                - Dynamic environments.
2223             core.cm:
2224                - SML/NJ-specific instantiations of the elaborator and MLRISC.
2225                - Top-level modules.
2226                - FLINT (this should eventually become its own library)
2227    
2228    Notes:
2229    
2230    I am not 100% happy with the way I separated the elaborator (and its
2231    data structures) from FLINT.  Two instances of the same problem:
2232    
2233        1. Data structures contain certain fields that carry FLINT-specific
2234           information.  I hacked around this using exn and the property list
2235           module from smlnj-lib.  But the fact that there are middle-end
2236           specific fields around at all is a bit annoying.
2237    
2238        2. The elaborator calculates certain FLINT-related information.  I tried
2239           to make this as abstract as I could using functorization, but, again,
2240           the fact that the elaborator has to perform calculations on behalf
2241           of the middle-end at all is not nice.
2242    
2243        3. Having to used exn and property lists is unfortunate because it
2244           weakens type checking.  The other alternative (parameterizing
2245           nearly *everything*) is not appealing, though.
2246    
2247    I removed the "rebinding =" warning hack because due to the new organization
2248    it was awkward to maintain it.  As a result, the compiler now issues some of
2249    these warnings when compiling init.cmi during bootstrap compilation. On
2250    the plus side, you also get a warning when you do, for example:
2251       val op = = Int32.+
2252    which was not the case up to now.
2253    
2254    I placed "assign" and "deref" into the _Core structure so that the
2255    code that deals with the "lazy" keyword can find them there.  This
2256    removes the need for having access to the primitive environment
2257    during elaboration.
2258    
2259    ----------------------------------------------------------------------
2260    Name: Matthias Blume
2261    Date: 2001/08/13
2262    Tag: blume-20010813-closures
2263    Description:
2264    
2265    This fix was sent to us by Zhong Shao.  It is supposed to improve the
2266    performance of certain loops by avoiding needless closure allocation.
2267    
2268    ----------------------------------------------------------------------
2269    Name: Lal George
2270    Date: 2001/07/31 10:03:23 EDT 2001
2271    Tag: george-20010731-x86-fmalloc
2272    Description: Fixed bug in x86 calls
2273    
2274        There was a bug where call instructions would mysteriously
2275        vanish. The call instruction had to be one that returned
2276        a floating point value.
2277    
2278    ----------------------------------------------------------------------
2279    Name: Lal George
2280    Date: 2001/07/19 16:36:29 EDT 2001
2281    Tag: george-20010719-simple-cells
2282    Description:
2283    
2284    I have dramatically simplified the interface for CELLS in MLRISC.
2285    
2286    In summary, the cells interface is broken up into three parts:
2287    
2288      1. CellsBasis : CELLS_BASIS
2289    
2290            CellsBasis is a top level structure and common for all
2291            architectures.  it contains the definitions of basic datatypes
2292            and utility  functions over these types.
2293    
2294      2. functor Cells() : CELLS
2295    
2296            Cells generates an interface for CELLS that incorporates the
2297            specific resources on the target architecture, such as the
2298            presence of special register classes, their number and size,
2299            and various useful substructures.
2300    
2301      3. <ARCH>CELLS
2302    
2303            e.g. SparcCells: SPARCCELLS
2304    
2305            <ARCH>CELLS usually contains additional bindings for special
2306            registers  on the architecture, such as:
2307    
2308                    val r0 : cell           (* register zero *)
2309                    val y : cell            (* Y register *)
2310                    val psr : cell          (* processor status register *)
2311                    ...
2312    
2313            The structure returned by applying the Cells functor is opened
2314            in this interface.
2315    
2316    The main implication of all this is that the datatypes for cells is
2317    split between CellsBasis and CELLS -- a fairly simple change for user
2318    code.
2319    
2320    In the old scheme the CELLS interface had a definitional binding of
2321    the form:
2322    
2323            signature CELLS = sig
2324    
2325               structure CellsBasis = CellsBasis
2326    
2327               ...
2328    
2329            end
2330    
2331    With all the sharing constraints that goes on in MLRISC, this old
2332    design  quickly leads to errors such as:
2333    
2334            "structure definition spec inside of sharing ... "
2335    
2336    
2337    and appears to require an unacceptable amount of sharing and where
2338    constraint hackery.
2339    
2340    I think this error message (the interaction of definitional specs and
2341    sharing) requires more explanation on our web page.
2342    
2343    ----------------------------------------------------------------------
2344    Name: Matthias Blume
2345    Date: 2001/07/19 15:00:00 EDT
2346    Tag: blume-20010719-libreorg
2347    Description:
2348    
2349    This update puts together a fairly extensive but straightforward change
2350    to the way the libraries that implement the interactive system are
2351    organized:
2352    
2353       The biggest change is the elimination of structure Compiler.  As a
2354       replacement for this structure, there is now a CM library
2355       (known as $smlnj/compiler.cm or $smlnj/compiler/current.cm)
2356       that exports all the substructures of the original structure Compiler
2357       directly.  So instead of saying Compiler.Foo.bar one now simply
2358       says Foo.bar.  (The CM libraries actually export a collection of
2359       structures that is richer than the collection of substructures of
2360       structure Compiler.)
2361    
2362       To make the transition smooth, there is a separate library called
2363       $smlnj/compiler/compiler.cm which puts together and exports the
2364       original structure Compiler (or at least something very close to it).
2365    
2366       There are five members of the original structure Compiler
2367       that are not exported directly but which instead became members
2368       of a new structure Backend (described by signature BACKEND).  These are:
2369       structure Profile (: PROFILE), structure Compile (: COMPILE), structure
2370       Interact (: INTERACT), structure Machine (: MACHINE), and val
2371       architecture (: string).
2372    
2373       Structure Compiler.Version has become structure CompilerVersion.
2374    
2375       Cross-compilers for alpha32, hppa, ppc, sparc, and x86 are provided
2376       by $smlnj/compiler/<arch>.cm where <arch> is alpha32, hppa, ppc, sparc,
2377       or x86, respectively.
2378       Each of these exports the same frontend structures that
2379       $smlnj/compiler.cm exports.  But they do not have a structure Backend
2380       and instead export some structure <Arch>Backend where <Arch> is Alpha32,
2381       Hppa, PPC, Sparc, or X86, respectively.
2382    
2383       Library $smlnj/compiler/all.cm exports the union of the exports of
2384       $smlnj/compiler/<arch>.cm
2385    
2386       There are no structures <Arch>Compiler anymore, use
2387       $smlnj/compiler/<arch>.cm instead.
2388    
2389       Library host-compiler-0.cm is gone.  Instead, the internal library
2390       that instantiates CM is now called cm0.cm.  Selection of the host
2391       compiler (backend) is no longer done here but. (Responsibility for it
2392       now lies with $smlnj/compiler/current.cm.  This seems to be more
2393       logical.)
2394    
2395       Many individual files have been moved or renamed.  Some files have
2396       been split into multiple files, and some "dead" files have been deleted.
2397    
2398    Aside from these changes to library organization, there are also changes
2399    to the way the code itself is organized:
2400    
2401       Structure Binfile has been re-implemented in such a way that it no
2402       longer needs any knowledge of the compiler.  It exclusively deals
2403       with the details of binfile layout.  It no longer invokes the
2404       compiler (for the purpose of creating new prospective binfile
2405       content), and it no longer has any knowledge of how to interpret
2406       pickles.
2407    
2408       Structure Compile (: COMPILE) has been stripped down to the bare
2409       essentials of compilation.  It no longer deals with linking/execution.
2410       The interface has been cleaned up considerably.
2411    
2412       Utility routines for dealing with linking and execution have been
2413       moved into their own substructures.
2414    
2415       (The ultimate goal of these changes is to provide a light-weight
2416       binfile loader/linker (at least for, e.g., stable libraries) that
2417       does not require CM or the compiler to be present.)
2418    
2419    CM documentation has been updated to reflect the changes to library
2420    organization.
2421    
2422    ----------------------------------------------------------------------
2423    Name: Matthias Blume
2424    Date: 2001/07/10 17:30:00 EDT
2425    Tag: Release_110_34
2426    Description:
2427    
2428    Minor tweak to 110.34 (re-tagged):
2429    
2430      - README.html file added to CVS repository
2431      - runtime compiles properly under FreeBSD 3.X and 4.X
2432    
2433    ----------------------------------------------------------------------
2434    Name: Matthias Blume
2435    Date: 2001/07/10 17:30:00 EDT
2436    Tag: Release_110_34
2437    Description:
2438    
2439    New version number (110.34). New bootfiles.
2440    
2441    ----------------------------------------------------------------------
2442    Name: Matthias Blume
2443    Date: 2001/07/09 16:00:00 EDT
2444    Tag: blume-20010709-more-varargs
2445    Description:
2446    
2447    I changed the handling of varargs in ml-nlffigen again:
2448    The ellipsis ... will now simply be ignored (with an accompanying warning).
2449    
2450    The immediate effect is that you can actually call a varargs function
2451    from ML -- but you can't actually supply any arguments beyond the ones
2452    specified explicitly.  (For example, you can call printf with its format
2453    string, but you cannot pass additional arguments.)
2454    
2455    This behavior is only marginally more useful than the one before, but
2456    it has the advantage that a function or, more importantly, a function
2457    type never gets dropped on the floor, thus avoiding follow-up problems with
2458    other types that refer to the offending one.
2459    
2460    ----------------------------------------------------------------------
2461    Name: Matthias Blume
2462    Date: 2001/07/09 11:25:00 EDT
2463    Tag: blume-20010709-varargs
2464    Description:
2465    
2466    1. ckit-lib.cm now exports structure Error
2467    2. ml-nlffigen reports occurences of "..." (i.e., varargs function types)
2468       with a warning accompanied by a source location.  Moreover, it
2469       merely skips the offending function or type and proceeds with the
2470       rest of its work.u  As a result, one can safely feed C code containing
2471       "..." to ml-nlffigen.
2472    3. There are some internal improvements to CM, providing slightly
2473       more general string substitutions in the tools subsystem.
2474    
2475    ----------------------------------------------------------------------
2476    Name: Matthias Blume
2477    Date: 2001/06/27 15:10:00 EDT
2478    Tag: blume-20010627-concur
2479    Description:
2480    
2481    Fixed a small bug in CM's handling of parallel compilation.
2482    (You could observe the bug by Control-C-interrupting an ordinary
2483    CMB.make or CM.stabilize and then attaching some compile servers.
2484    The result was that all of a sudden the previously interrupted
2485    compilation would continue on its own.  This was because of
2486    an over-optimization: CM did not bother to clean out certain queues
2487    when no servers were attached "anyway", resulting in the contents
2488    of these queues to grab control when new servers did get attached.)
2489    
2490    There is also another minor update to the CM manual.
2491    
2492    ----------------------------------------------------------------------
2493    Name: Matthias Blume
2494    Date: 2001/06/26 16:15:00 EDT
2495    Tag: blume-20010626-cmdoc
2496    Description:
2497    
2498    Minor typo fixed in CM manual (syntax diagram for libraries).
2499    
2500    ----------------------------------------------------------------------
2501    Name: Matthias Blume
2502    Date: 2001/06/25 22:55:00 EDT
2503    Tag: blume-20010625-x86pc
2504    Description:
2505    
2506    Fixed a nasty bug in the X86 assembly code that caused signal
2507    handlers to fail (crash) randomly.
2508    
2509    ----------------------------------------------------------------------
2510    Name: Matthias Blume
2511    Date: 2001/06/25 12:05:00 EDT
2512    Tag: blume-20010625-nlffigen
2513    Description:
2514    
2515    This update fixes a number of minor bugs in ml-nlffigen as reported by
2516    Nick Carter <nbc@andrew.cmu.edu>.
2517    
2518      1. Silly but ok typedefs of the form "typedef void myvoid;" are now accepted.
2519      2. Default names for generated files are now derived from the name of
2520         the C file *without its directory*.  In particular, this causes generated
2521         files to be placed locally even if the C file is in some system directory.
2522      3. Default names for generated signatures and structures are also derived
2523         from the C file name without its directory.  This avoids silly things
2524         like "structure GL/GL".
2525         (Other silly names are still possible because ml-nlffigen does not do
2526          a thorough check of whether generated names are legal ML identifiers.
2527          When in doubt, use command line arguments to force particular names.)
2528    
2529    ----------------------------------------------------------------------
2530    Name: Matthias Blume
2531    Date: 2001/06/21 12:25:00 EDT
2532    Tag: blume-20010621-eXene
2533    Description:
2534    
2535    eXene now compiles and (sort of) works again.
2536    
2537    The library name (for version > 110.33) is $/eXene.cm.
2538    
2539    I also added an new example in src/eXene/examples/nbody.  See the
2540    README file there for details.
2541    
2542    ----------------------------------------------------------------------
2543    Name: Matthias Blume
2544    Date: 2001/06/20 16:40:00 EDT
2545    Tag: blume-20010620-cml
2546    Description:
2547    
2548    CML now compiles and works again.
2549    
2550    Libraries (for version > 110.33):
2551    
2552      $cml/cml.cm            Main CML library.
2553      $cml/basis.cm          CML's version of $/basis.cm.
2554      $cml/cml-internal.cm   Internal helper library.
2555      $cml/core-cml.cm       Internal helper library.
2556      $cml-lib/trace-cml.cm  Tracing facility.
2557      $cml-lib/smlnj-lib.cm  CML's version of $/smlnj-lib.cm
2558    
2559    The installer (config/install.sh) has been taught how to properly
2560    install this stuff.
2561    
2562    ----------------------------------------------------------------------
2563    Name: Matthias Blume
2564    Date: 2001/06/19 17:55:00 EDT
2565    Tag: blume-20010619-instantiate
2566    Description:
2567    
2568    This un-breaks the fix for bug 1432.
2569    (The bug was originally fixed in 110.9 but I broke it again some
2570    time after that.)
2571    
2572    ----------------------------------------------------------------------
2573    Name: Matthias Blume
2574    Date: 2001/06/19 17:25:00 EDT
2575    Tag: blume-20010619-signals
2576    Description:
2577    
2578    This should (hopefully) fix the long-standing signal handling bug.
2579    (The runtime system was constructing a continuation record with an
2580    incorrect descriptor which would cause the GC to drop data on the floor...)
2581    
2582    ----------------------------------------------------------------------
2583    Name: Matthias Blume
2584    Date: 2001/06/15 15:05:00 EDT
2585    Tag: blume-20010615-moresparc
2586    Description:
2587    
2588    Here is a short late-hour update related to Sparc c-calls:
2589    
2590     -- made handling of double-word arguments a bit smarter
2591    
2592     -- instruction selection phase tries to collapse certain clumsily
2593        constructed ML-Trees; typical example:
2594    
2595            ADD(ty,ADD(_,e,LI d1),LI d2)  ->  ADD(ty,e,LI(d1+d2))
2596    
2597        This currently has no further impact on SML/NJ since mlriscGen does
2598        not seem to generate such patterns in the first place, and c-calls
2599        (which did generate them in the beginning) has meanwhile been fixed
2600        so as to avoid them as well.
2601    
2602    ----------------------------------------------------------------------
2603    Name: Matthias Blume
2604    Date: 2001/06/15 15:05:00 EDT
2605    Tag: blume-20010615-sparc
2606    Description:
2607    
2608    The purpose of this update is to provide an implementation of NLFFI
2609    on Sparc machines.
2610    
2611    Here are the changes in detail:
2612    
2613       * src/MLRISC/sparc/c-calls/sparc-c-calls.sml is a new file containing
2614       the Sparc implementation of the c-calls API.
2615       * The Sparc backend of SML/NJ has been modified to uniformely use %fp
2616       for accessing the ML frame.  Thus, we have a real frame pointer and
2617       can freely modify %sp without need for an omit-frame-ptr phase.
2618       The vfp logic in src/compiler/CodeGen/* has been changed to accomodate
2619       this case.
2620       * ml-nlffigen has been taught to produce code for different architectures
2621       and calling conventions.
2622       * In a way similar to what was done in the x86 case, the Sparc
2623       backend uses its own specific extension to mltree.  (For example,
2624       it needs to be able to generate UNIMP instructions which are part
2625       of the calling convention.)
2626       * ml-nlffi-lib was reorganized to make it more modular (in particular,
2627       to make it easier to plug in new machine- and os-dependent parts).
2628    
2629    There are some other fairly unrelated bug fixes and cleanups as well:
2630    
2631       * I further hacked the .cm files for MLRISC tools (like MDLGen) so
2632       that they properly share their libraries with existing SML/NJ libraries.
2633       * I fixed a minor cosmetic bug in CM, supressing certain spurious
2634       follow-up error messages.
2635       * Updates to CM/CMB documentation.
2636    
2637    TODO items:
2638    
2639       * MLRISC should use a different register as its asmTemp on the Sparc.
2640         (The current %o2 is a really bad choice because it is part of the
2641         calling conventions, so things might interfere in unexpected ways.)
2642    
2643    ----------------------------------------------------------------------
2644    Name: Matthias Blume
2645    Date: 2001/06/07
2646    Tag: blume-20010607-calls
2647    Description:
2648    
2649    A number of internal changes related to C calls and calling conventions:
2650    
2651    1. ML-Tree CALL statements now carry a "pops" field.  It indicates the
2652       number of bytes popped implicitly (by the callee).  In most cases
2653       this field is 0 but on x86/win32 it is some non-zero value.  This
2654       is information provided for the benefit of the "omit-frameptr" pass.
2655    2. The CALL instruction on the x86 carries a similar "pops" field.
2656       The instruction selection phase copies its value from the ML-Tree
2657       CALL statement.
2658    3. On all other architectures, the instruction selection phase checks
2659       whether "pops=0" and complains if not.
2660    4. The c-calls implementation for x86 now accepts two calling conventions:
2661       "ccall" and "stdcall".  When "ccall" is selected, the caller cleans
2662       up after the call and pops is set to 0.  For "stdcall", the caller
2663       does nothing, leaving the cleanup to the callee; pops is set to
2664       the number of bytes that were pushed onto the stack.
2665    5. The cproto decoder (compiler/Semant/types/cproto.sml) now can
2666       distinguish between "ccall" and "stdcall".
2667    6. The UNIMP instruction has been added to the supported Sparc instruction
2668       set. (This is needed for implementing the official C calling convention
2669       on this architecture.)
2670    7. I fixed some of the .cm files under src/MLRISC/Tools to make them
2671       work with the latest CM.
2672    
2673    ----------------------------------------------------------------------
2674    Name: Matthias Blume
2675    Date: 2001/06/05 15:10:00 EDT
2676    Tag: blume-20010605-cm-index
2677    Description:
2678    
2679    0. The "lambdasplit" parameter for class "sml" in CM has been documented.
2680    
2681    1. CM can now generate "index files".  These are human-readable files
2682       that list on a per-.cm-file basis each toplevel symbol defined or
2683       imported.  The location of the index file for
2684       <p>/<d>.cm is <p>/CM/INDEX/<d>.cm.
2685       To enable index-file generation, set CM.Control.generate_index to true
2686       or export an environment-symbol: export CM_GENERATE_INDEX=true.
2687    
2688       The CM manual has been updated accordingly.
2689    
2690    2. I made some slight modifications to the c-calls API in MLRISC.
2691    
2692         a) There is now a callback to support saving/restoring of
2693            dedicated but caller-save registers around the actual call
2694            instruction.
2695         b) One can optionally specify a comment-annotation for the
2696            call instruction.
2697    
2698    3. SML/NJ (mlriscGen.sml) uses this new API for the rawccall primop.
2699       (For example, the comment annotation shows the C prototype of
2700        the function being called.)
2701    
2702    ----------------------------------------------------------------------
2703    Name: Matthias Blume
2704    Date: 2001/06/01 13:30:00 EDT
2705    Tag: blume-20010601-nlffi-cleanup
2706    Description:
2707    
2708    This is mostly a cleanup of MLFFI stuff:
2709    
2710       - some signature files have been put into a more exposed place
2711       - the ugly 'f type parameter is gone (simplifies types tremendously!)
2712       - ml-nlffigen changed accordingly
2713       - tutorial updated
2714    
2715    Other changes:
2716    
2717       - author's affiliation in CM manual(s) updated
2718       - some more recognized keywords added to Allen's sml.sty
2719    
2720    ----------------------------------------------------------------------
2721    Name: Matthias Blume
2722    Date: 2001/05/25 15:30:00 EDT
2723    Tag: blume-20010525-iptr
2724    Description:
2725    
2726      - put the official 110.33-README (as it appears on the ftp server) under
2727        CVS
2728      - fixed a small bug related to incomplete pointer types in
2729        ml-nlffigen
2730      - small cosmetic change to the ml-nlffi-lib's "arr" type constructor
2731        (it does not need the 'f type parameter)
2732    
2733    ----------------------------------------------------------------------
2734    Name: Matthias Blume
2735    Date: 2001/05/23 14:30:00 EDT
2736    Tag: Release_110_33
2737    Description:
2738    
2739    New version number (110.33).  New bootfiles.
2740    
2741    ----------------------------------------------------------------------
2742    Name: Matthias Blume
2743    Date: 2001/05/22 18:06:00 EDT
2744    Tag: blume-20010522-targets
2745    Description:
2746    
2747    Made install.sh use file config/targets.customized if it exists, falling
2748    back to config/targets if it doesn't.  This way one can have a customized
2749    version of the targets file without touching the "real thing", thus
2750    eliminating the constant fear of accidentally checking something bogus
2751    back into the CVS repository...  (File config/targets.customized must
2752    not be added to the repository!)
2753    
2754    ----------------------------------------------------------------------
2755    Name: Matthias Blume
2756    Date: 2001/05/22 16:30:00 EDT
2757    Tag: blume-20010522-minitut
2758    Description:
2759    
2760    1. Bug fix in ml-nlffigen; now (hopefully) correctly handling
2761       struct returns.
2762    2. Added src/ml-nlffi-lib/Doc/mini-tutorial.txt.  This is some very
2763       incomplete, preliminary documentation for NLFFI.
2764    
2765    ----------------------------------------------------------------------
2766    Name: Matthias Blume
2767    Date: 2001/05/14 11:30:00 EDT
2768    Tag: blume-20010514-script
2769    Description:
2770    
2771    Some bugs in install script fixed.
2772    
2773    In addition to that I also made a slight change to the NLFFI API:
2774    Functors generated by ml-nlffigen now take the dynamic library as a
2775    straight functor argument, not as a suspended one.  (The original
2776    functor code used to force the suspension right away anyway, so there
2777    was nothing gained by this complication of the interface.)
2778    
2779    ----------------------------------------------------------------------
2780    Name: Matthias Blume
2781    Date: 2001/05/11 14:35:00 EDT
2782    Tag: blume-20010511-ml-nlffi
2783    Description:
2784    
2785    I finally took the plunge and added my new FFI code to the main
2786    repository.  For x86-linux it is now ready for prime-time.
2787    
2788    There are two new subdirectories of "src":
2789    
2790      - ml-nlffi-lib:
2791           The utility library for programs using the FFI interface.
2792           Here is the implementation of $/c.cm and its associated low-level
2793           partners $/c-int.cm and $/memory.cm.
2794      - ml-nlffigen:
2795           A stand-alone program for generating ML glue code from C source
2796           code.
2797    
2798    Building ml-nlffigen requires $/ckit-lib.cm.
2799    
2800    The config/install.sh script has been updates to do the Right Thing
2801    (hopefully).
2802    
2803    Notice that the source tree for the C-Kit will not be put under "src"
2804    but directly under the installation root directory.  (This is the
2805    structure that currently exists on the CVS server when you check out
2806    module "sml".)  Fortunately, config/install.sh knows about this oddity.
2807    
2808    Bugs: No documentation yet.
2809    
2810    ----------------------------------------------------------------------
2811    Name: Matthias Blume
2812    Date: 2001/05/09 16:35:00 EDT
2813    Tag: blume-20010509-cpscontract
2814    Description:
2815    
2816    Fixed a bug in the accounting code in cpsopt/contract.sml.  (The
2817    wrapper/unwrapper elimination did not decrement usage counts and some
2818    dead variables got overlooked by the dead-up logic.)
2819    
2820    ----------------------------------------------------------------------
2821    Name: Lal George
2822    Date: 2001/05/08  17:26:09 EDT
2823    Tag: george-20010508-omit-frameptr
2824    Description:
2825    
2826    Changes to implement the omit-frame-pointer optimization to support
2827    raw C calls. For now, there is only support on the Intel x86, but
2828    other architectures will follow as more experience is gained with this.
2829    
2830    
2831    ----------------------------------------------------------------------
2832    Name: Matthias Blume
2833    Date: 2001/05/07 14:40:00 EDT
2834    Tag: blume-20010507-proxies
2835    Description:
2836    
2837    I made into "proxy libraries" all libraries that qualify for such a
2838    change.  (A qualifying library is a library that has another library or
2839    groups as its sole member and repeats that member's export list
2840    verbatim.  A proxy library avoids this repetition by omitting its export
2841    list, effectively inheriting the list that its (only) member exports.
2842    See the CM manual for more explanation.)
2843    The main effect is that explicit export lists for these libraries
2844    do not have to be kepts in sync, making maintenance a bit easier.
2845    
2846    I also added copyright notices to many .cm-files.
2847    
2848    Last but not least, I made a new set of bootfiles.
2849    
2850    ----------------------------------------------------------------------
2851    Name: Matthias Blume
2852    Date: 2001/05/04 17:00:00 EDT
2853    Tag: blume-20010504-cm-lsplit
2854    Description:
2855    
2856    0. John merged pending changes to $/smlnj-lib.cm
2857    
2858    1. Allen's previous change accidentally backed out of one of Lal's
2859       earlier changes.  I undid this mistake (re-introducing Lal's change).
2860    
2861    2. I used the new topOrder' function from graph-scc.sml (from $/smlnj-lib.cm)
2862       within the compiler where applicable.  There is some code simplification
2863       because of that.
2864    
2865    3. The "split" phase (in FLINT) is now part of the default list of phases.
2866       Compiler.Control.LambdaSplitting.* can be used to globally control the
2867       lambda-splitting (cross-module-inlining) engine.  In addition to that,
2868       it can now also be controlled on a per-source basis: CM has been taught
2869       a new tool parameter applicable to ML source files.
2870    
2871       - To turn lambda-splitting off completely:
2872            local open Compiler.Control.LambdaSplitting in
2873                val _ = set Off
2874            end
2875       - To make "no lambda-splitting" the global default (but allow per-source
2876         overriding); this is the initial setting:
2877            local open Compiler.Control.LambdaSplitting in
2878                val _ = set (Default NONE)
2879            end
2880       - To make "lambda-splitting with aggressiveness a" the global default
2881         (and allow per-source overriding):
2882            local open Compiler.Control.LambdaSplitting in
2883                val _ = set (Default (SOME a))
2884            end
2885    
2886       - To turn lambda-splitting off for a given ML souce file (say: a.sml)
2887         write (in the respective .cm-file):
2888            a.sml (lambdasplitting:off)
2889       - To turn lambda-splitting for a.sml on with minimal aggressiveness:
2890            a.sml (lambdasplitting:on)
2891       - To turn lambda-splitting for a.sml on with aggressiveness <a> (where
2892         <a> is a decimal non-negative integer):
2893            a.sml (lambdasplitting:<a>)
2894       - To turn lambda-splitting for a.sml on with maximal aggressiveness:
2895            a.sml (lambdasplitting:infinity)
2896       - To use the global default for a.sml:
2897            a.sml (lambdasplitting:default)
2898         or simply
2899            a.sml
2900    
2901    ----------------------------------------------------------------------
2902    Name: Allen Leung
2903    Date: 2001/05/04 01:57:00 EDT
2904    Tag: leunga-20010504-sync
2905    Description:
2906    
2907      MLRISC features.
2908    
2909      1. Fix to CMPXCHG instructions.
2910      2. Changed RA interface to allow annotations in callbacks.
2911      3. Added a new method to the stream interface to allow annotations updates.
2912    
2913    ----------------------------------------------------------------------
2914    Name: Matthias Blume
2915    Date: 2001/05/01 11:45:00 EDT
2916    Tag: blume-20010501-pcedittmp
2917    Description:
2918    
2919    Changed install.sh to use the current working directory instead of
2920    /usr/tmp for a temporary file (pcedittmp).  The previous choice
2921    of /usr/tmp caused trouble with MacOS X because of file premission
2922    problems.
2923    
2924    ----------------------------------------------------------------------
2925    Name: Matthias Blume
2926    Date: 2001/04/20 11:10:00 EDT
2927    Tag: blume-20010420-inMLflag
2928    Description:
2929    
2930     - added vp_limitPtrMask to vproc-state.h
2931       (for use by the raw-C-calls mechanism to implement proper interrupt
2932        handling)
2933     - made the ML compiler aware of various data-structure offsets so it
2934       can generate code for accessing the vp_inML flag and vp_limitPtrMask
2935     - tweaked mlriscGen.sml to have it emit interrupt-handling code for
2936       raw C-calls
2937    
2938    ----------------------------------------------------------------------
2939    Name: Lal George
2940    Date: 2001/04/20 09:15:28 EDT
2941    Tag: george-20010420-macosX
2942    Description:
2943    
2944     - Changes to port to Mac OS X; Darwin.
2945    
2946     - In the process I found that sqrt was broken on the PPC, because the
2947       fsqrt instruction is not implemented.
2948    
2949    ----------------------------------------------------------------------
2950    Name: Matthias Blume
2951    Date: 2001/04/18 12:45:00 EDT
2952    Tag: blume-20010418-ccalls
2953    Description:
2954    
2955     - fixed two off-by-4 errors in the x86-specific c-calls implementation
2956       (this bug prevented structure arguments containing pointers from being
2957        passed correctly)
2958     - changed the raw-C-call code in mlriscGen.sml in such a way that
2959       structure arguments are represented as a pointer to the beginning
2960       of the structure (instead of having a series of synthesized arguments,
2961       one for each structure member)
2962    
2963     - made makeml script's verbosity level configurable via environment
2964       variable (MAKEML_VERBOSITY)
2965    
2966     - eliminated placeholder implementations for f32l, w16s, i16s, and f32s
2967       in rawmem-x86.sml; we are now using the real thing
2968    
2969    ----------------------------------------------------------------------
2970    Name: Matthias Blume
2971    Date: 2001/03/22 16:25:00 EST
2972    Tag: blume-20010322-bootfiles
2973    Description:
2974    
2975    Created a new set of bootfiles (for your automatic installation convenience).
2976    
2977    ----------------------------------------------------------------------
2978    Name: Matthias Blume
2979    Date: 2001/03/22 15:10:00 EST
2980    Tag: blume-20010322-rawmem-parcm
2981    Description:
2982    
2983    1. All "raw memory access" primitives for the new FFI are implemented now
2984       (at least on the x86).
2985    2. Some further cleanup of CM's parallel make mechanism.
2986    
2987    ----------------------------------------------------------------------
2988    Name: Matthias Blume
2989    Date: 2001/03/19 17:53:00 EST
2990    Tag: blume-20010319-parallel
2991    Description:
2992    
2993    Parallel make (using compile servers) now works again.
2994    
2995    To this end, CM.stabilize and CMB.make have been modified to work in
2996    two passes when compile servers are attached:
2997       1. Compile everything, do not perform stabilization; this pass
2998          uses compile servers
2999       2. Stabilize everything; this pass does not use compile servers
3000    If there are no compile servers, the two passes are combined into one
3001    (as before).  Splitting the passes increases the inherent parallelism
3002    in the dependency graph because the entire graph including all
3003    libraries is available at the same time.  This, in turn, improves
3004    server utilization.  The downside is that the master process will
3005    have to do some extra work after compilation is done (because for
3006    technical reasons it must re-read all the binfiles during stabilization).
3007    
3008    ----------------------------------------------------------------------
3009    Name: Matthias Blume
3010    Date: 2001/03/16 12:22:00 EST
3011    Tag: blume-20010316-bootfiles
3012    Description:
3013    
3014    Created a new set of bootfiles (for your automatic installation convenience).
3015    
3016    ----------------------------------------------------------------------
3017    Name: Matthias Blume
3018    Date: 2001/03/16 11:00:00 EST
3019    Tag: blume-20010316-MLTREE-fixup
3020    Description:
3021    
3022    This is a minor fixup for an (untagged) earlier commit by Allen.
3023    (A file was missing).
3024    
3025    ----------------------------------------------------------------------
3026    Name: Allen Leung
3027    Date: Mon Mar  5 18:54:57 EST 2001
3028    Tag: leunga-20010305-cut-support
3029    
3030    1. New support for alternative control-flow in MLTREE.
3031       Currently we support
3032    
3033          FLOW_TO(CALL ...., [k1,...,kn])
3034    
3035       This is needed for 'cuts to' in C-- and try/handle-like constructs
3036       in Moby
3037    
3038       New assembler flag "asm-show-cutsto" to turn on control-flow debugging.
3039    
3040    2. Register Allocator
3041    
3042       Changes in interface [from Fermin, John]
3043    
3044    3. Alpha 8-bit SLL support [Fermin]
3045    
3046    4. All architectures
3047    
3048       A new module (ClusterExpandCopies) for expanding parallel copies.
3049    
3050    ----------------------------------------------------------------------
3051    Name: Allen Leung
3052    Date: 2001/02/27 23:07:00 EST
3053    Tag: leunga-20010227-minor-stuff
3054    
3055    1. Alpha bug fix for CMOVNE
3056    2. Handle mltree COND(..,FCMP ...,...)
3057    3. Bug fix in simplifier
3058    
3059    ----------------------------------------------------------------------
3060    Name: Matthias Blume
3061    Date: 2001/01/30 17:50:00 EST
3062    Tag: blume-20010130-sync
3063    Description:
3064    
3065    This is just a minor update to sync my devel branch with the main brach.
3066    The only visible change is the addition of some README files.
3067    
3068    ----------------------------------------------------------------------
3069    Name: Matthias Blume
3070    Date: 2001/01/12 23:30:00 JST
3071    Tag: blume-20010112-bootfiles
3072    Description:
3073    
3074    Made a new set of bootfiles that goes with the current state of the
3075    repository.
3076    
3077    ----------------------------------------------------------------------
3078    Name: Matthias Blume
3079    Date: 2001/01/12 21:20:00 JST
3080    Tag: blume-20010112-sync
3081    Description:
3082    
3083    I am just flushing out some minor changes that had accumulated in
3084    my private branch in order to sync with the main tree.  (This is
3085    mainly because I had CVS trouble when trying to merge _into_ my
3086    private branch.)
3087    
3088    Most people should be completely unaffected by this.
3089    
3090    ----------------------------------------------------------------------
3091    Name: Allen Leung
3092    Date: Thu Jan 11 21:03:00 EST 2001
3093    Tag: leunga-20010111-labexp=mltree
3094    Description:
3095    
3096    1.  Removed the type LabelExp and replace it by MLTree.
3097    2.  Rewritten mltree-simplify with the pattern matcher tool.
3098    3.  There were some bugs in alpha code generator which would break
3099        64-bit code generation.
3100    4.  Redo the tools to generate code with the
3101    5.  The CM files in MLRISC (and in src/system/smlnj/MLRISC)
3102        are now generated by perl scripts.
3103    
3104    ----------------------------------------------------------------------
3105    Name: Matthias Blume
3106    Date: 2001/01/10 21:55:00 JST
3107    Tag: blume-20010110-rcc
3108    Description:
3109    
3110    The RCC stuff now seems to work (but only on the x86).
3111    This required hacking of the c-calls interface (and -implementation) in
3112    MLRISC.
3113    
3114    Normal compiler users should be unaffected.
3115    
3116    ----------------------------------------------------------------------
3117    Name: Matthias Blume
3118    Date: 2001/01/09 01:20:00 JST
3119    Tag: blume-20010109-rcc
3120    Description:
3121    
3122    This is a fairly big patch, flushing out a large number of pending
3123    changes that I made to my development copy over the last couple of days.
3124    
3125    Of practical relevance at this moment is a workaround for a pickling
3126    bug that Allen ran into the other day.  The cause of the bug itself is
3127    still unknown and it might be hard to fix it properly, but the
3128    workaround has some merits of its own (namely somewhat reducing pickling
3129    overhead for certain libraries).  Therefore, I think this solution should
3130    be satisfactory at this time.
3131    
3132    The rest of the changes (i.e., the vast majority) has to do with my
3133    ongoing efforts of providing direct support for C function calls from
3134    ML.  At the moment there is a new primop "RAW_CCALL", typing magic
3135    in types/cproto.sml (invoked from FLINT/trans/translate.sml), a new
3136    case in the FLINT CPS datatype (RCC), changes to cps/convert.sml to
3137    translate uses of RAW_CCALL into RCC, and changes to mlriscGen.sml to
3138    handle RCC.
3139    
3140    The last part (the changes to mlriscGen.sml) are still known to be
3141    wrong on the x86 and not implemented on all other architectures.  But
3142    the infrastructure is in place. I had to change a few functor
3143    signatures in the backend to be able to route the CCalls interface
3144    from MLRISC there, and I had to specialize the mltree type (on the
3145    x86) to include the necessary extensions. (The extensions themselves
3146    were already there and redy to go in MLRISC/x86).
3147    
3148    Everything should be very happy as soon as someone helps me with
3149    mlriscGen.sml...
3150    
3151    In any case, nothing of this should matter to anyone as long as the
3152    new primop is not being used (which is going to be the case unless you
3153    find it where I hid it :). The rest of the compiler is completely
3154    unaffected.
3155    
3156    ----------------------------------------------------------------------
3157    Name: Matthias Blume
3158    Date: 2001/01/05 00:30:00 JST
3159    Tag: blume-20010105-primops
3160    Description:
3161    
3162    Added some experimental support for work that I am doing right now.
3163    These changes mostly concern added primops, but there is also a new
3164    experimental C library in the runtime system (but currently not enabled
3165    anywhere except on Linux/X86).
3166    
3167    In the course of adding primops (and playing with them), I discovered that
3168    Zhong's INL_PRIM hack (no type info for certain primops) was, in fact, badly
3169    broken.  (Zhong was very right he labeled this stuff as "major gross hack".)
3170    To recover, I made type information in INL_PRIM mandatory and changed
3171    prim.sml as well as built-in.sml accordingly.  The InLine structure now
3172    has complete, correct type information (i.e., no bottom types).
3173    
3174    Since all these changes mean that we need new binfiles, I also bumped the
3175    version number to 110.32.1.
3176    
3177    ----------------------------------------------------------------------
3178    Name: Matthias Blume
3179    Date: 2000/12/30 22:10:00 JST
3180    Tag: blume-20001230-various
3181    Description:
3182    
3183    Added proxy libraries for MLRISC and let MLRISC libraries refer
3184    to each other using path anchors.  (See CM manual for explanation.)
3185    
3186    Updated CM documentation.
3187    
3188    Fixed some bugs in CM.
3189    
3190    Implemented "proxy" libraries (= syntactic sugar for CM).
3191    
3192    Added "-quiet" option to makeml and changed runtime system accordingly.
3193    
3194    Added cleanup handler for exportML to reset timers and compiler stats.
3195    
3196    ----------------------------------------------------------------------
3197    Name: Lal George
3198    Date: 2000/12/22 22:22:58 EST 2000
3199    Tag: Release_110_32
3200    Description:
3201    
3202            Infinite precision used throughout MLRISC.
3203            see MLRISC/mltree/machine-int.sig
3204    
3205    ----------------------------------------------------------------------
3206    Name: Matthias Blume
3207    Date: 2000/12/22 23:16:00 JST
3208    Tag: blume-20001222-warn
3209    Description:
3210    
3211    Corrected wording and formatting of some CM warning message which I
3212    broke in my previous patch.
3213    
3214    ----------------------------------------------------------------------
3215    Name: Matthias Blume
3216    Date: 2000/12/22 21:20:00 JST
3217    Tag: blume-20001222-anchorenv
3218    Description:
3219    
3220    Fixed CM's handling of anchor environments in connection with CMB.make.
3221    
3222    ----------------------------------------------------------------------
3223    Name: Matthias Blume
3224    Date: 2000/12/22 13:15:00 JST
3225    Tag: blume-20001222-cleanup
3226    Description:
3227    
3228    Removed src/cm/ffi which does not (and did not) belong here.
3229    
3230    ----------------------------------------------------------------------
3231    Name: Matthias Blume
3232    Date: 2000/12/21 23:55:00 JST
3233    Tag: blume-20001221-exn
3234    Description:
3235    
3236    Probably most important: CM no longer silently swallows all exceptions
3237    in the compiler.
3238    Plus: some other minor CM changes.  For example, CM now reports some
3239    sizes for generated binfiles (code, data, envpickle, lambdapickle).
3240    
3241    ----------------------------------------------------------------------
3242    Name: Matthias Blume
3243    Date: 2000/12/15 00:01:05 JST
3244    Tag: blume-20001215-dirtool
3245    Description:
3246    
3247    - "dir" tool added.
3248    - improvements and cleanup to Tools structure
3249    - documentation updates
3250    
3251    ----------------------------------------------------------------------
3252    Name: Allen Leung
3253    Date: Thu Dec 14 03:45:24 EST 2000
3254    Description:
3255    Tag:  leunga-20001214-int-inf
3256    Description:
3257    
3258       In IntInf, added these standard functions, which are missing from our
3259    implementation:
3260    
3261        andb : int * int -> int
3262        xorb : int * int -> int
3263        orb  : int * int -> int
3264        notb : int -> int
3265         <<   : int * word -> int
3266        ~>>  : int * word -> int
3267    
3268       Not tested, I hope they are correct.
3269    
3270    ----------------------------------------------------------------------
3271    Name: Allen Leung
3272    Date: Fri Dec  8 19:23:26 EST 2000
3273    Description:
3274    Tag:  leunga-20001208-nowhere
3275    Description:
3276    
3277      Slight improvements to the 'nowhere' tool to handle OR-patterns,
3278    to generate better error messages etc.  Plus a brief manual.
3279    
3280    ----------------------------------------------------------------------
3281    Name: Lal George
3282    Date: 2000/12/08 09:54:02 EST 2000
3283    Tag: Release_110_31
3284    Description:
3285    
3286    - Version 110.31
3287    ----------------------------------------------------------------------
3288    Name: Allen Leung
3289    Date: Thu Dec  7 22:01:04 EST 2000
3290    Tag:  leunga-20001207-cell-monster-hack
3291    Description:
3292    
3293    Major MLRISC internal changes.  Affect all clients.
3294    Summary:
3295    
3296    1.  Type CELLS.cell = int is now replaced by a datatype.
3297        As a result, the old regmap is now gone.  Almost all interfaces
3298        in MLRISC change as a consequence.
3299    
3300    2.  A new brand version of machine description tool (v3.0) that generates
3301        modules expecting the new interface.  The old version is removed.
3302    
3303    3.  The RA interface has been further abstracted into two new functors.
3304        RISC_RA and X86RA.  These functors have much simpler interfaces.
3305        [See also directory MLRISC/demo.]
3306    
3307    4.  Some other new source->source code generation tools are available:
3308    
3309        a. MLRISC/Tools/RewriteGen -- generate rewriters from rules.
3310        b. MLRISC/Tools/WhereGen -- expands conditional pattern matching rules.
3311           I use this tool to generate the peephole optimizers---with the new
3312           cell type changes, peephole rules are becoming difficult to write
3313           without conditional pattern matching.
3314    
3315    5.  More Intmap -> IntHashTable change.  Previous changes by Matthias didn't
3316        cover the entire MLRISC source tree so many things broke.
3317    
3318    6.  CM files have been moved to the subdirectory MLRISC/cm.
3319        They are moved because there are a lot of them and they clutter up the
3320        root dir.
3321    
3322    7.  More detailed documentation to come...
3323    
3324        NOTE: To rebuild from 110.30 (ftp distribution), you'll have to do
3325        a makeml -rebuild first.  This is because of other other
3326        changes that Matthias has made (see below).
3327    
3328    
3329    ----------------------------------------------------------------------
3330    Name: Matthias Blume
3331    Date: 2000/11/30 23:12:00 JST
3332    Tag: blume-20001130-filereorg
3333    Description:
3334    
3335    Some manual updates and some file reorganizations in CM.
3336    
3337    ----------------------------------------------------------------------
3338    Name: Matthias Blume
3339    Date: 2000/11/24 17:45:00 JST
3340    Tag: blume-20001124-link
3341    Description:
3342    
3343    Drastically improved link traversal code for the case that the dynamic
3344    value was already loaded at bootstrap time.  As a result, CM and CMB
3345    now both load blazingly fast -- even on a very slow machine.  Also,
3346    memory consumption has been further reduced by this.
3347    
3348    Warning: The format of the PIDMAP file has changed.  THerefore, to
3349    bootstrap you have to do this:
3350    
3351    1. Run CMB.make
3352    2. Make a symbolic link for the boot directory:
3353         ln -s sml.boot.ARCH-OS xxx
3354    3. "Rebuild" the boot directory:
3355         ./makeml -boot xxx -rebuild sml ; rm xxx
3356    4. Boot normally:
3357          ./makeml
3358    
3359    ----------------------------------------------------------------------
3360    Name: Matthias Blume
3361    Date: 2000/11/21 21:20:00 JST
3362    Tag: blume-20001121-tools
3363    Description:
3364    
3365    Continued hacking on autoloading problem -- with success this time.
3366    Also changed tool-plugin mechanism.  See new CM manual.
3367    
3368    ----------------------------------------------------------------------
3369    Name: Matthias Blume
3370    Date: 2000/11/19 14:30:00 JST
3371    Tag:  blume-20001119-autoload
3372    Description:
3373    
3374    Some hacking to make autoloading faster.  Success for CMB, no success
3375    so far for CM.  There is a reduced structure CM' that autoloads faster.
3376    (This is a temporary, non-documented hack to be eliminated again when
3377    the general problem is solved.)
3378    
3379    ----------------------------------------------------------------------
3380    Name: Matthias Blume
3381    Date: 2000/11/17 14:10:00 JST
3382    Tag: blume-20001117-pickle-lib
3383    Description:
3384    
3385    1. Eliminated comp-lib.cm
3386    2. Made pickle-lib.cm
3387    3. Eliminated all uses of intset.sml (from comp-lib.cm)
3388    4. Replaced all uses of intmap.{sig,sml} (from comp-lib.cm) with
3389       equivalent constructs from smlnj-lib.cm (INtHashTable).
3390    5. Point 4. also goes for those uses of intmap.* in MLRISC.
3391       Duplicated intmap modules thrown out.
3392    6. Hunted down all duplicated SCC code and replaced it with
3393       equivalent stuff (GraphSCCFn from smlnj-lib.cm).
3394    7. Rewrote Feedback module.
3395    8. Moved sortedlist.sml into viscomp-lib.cm.  Eventually it
3396       should be thrown out and equivalent modules from smlnj-lib.cm
3397       should be used (IntRedBlackSet, IntListSet, ...).
3398    
3399    Confirmed that compiler compiles to fixpoint.
3400    
3401    ----------------------------------------------------------------------
3402    Name: Allen Leung
3403    Date: 2000/11/10 18:00:00
3404    Tag: leunga-20001110-new-x86-fp
3405    
3406    A new x86 floating point code generator has been added.
3407    By default this is turned off.  To turn this on, do:
3408    
3409        CM.autoload "$smlnj/compiler.cm";
3410        Compiler.Control.MLRISC.getFlag "x86-fast-fp" := true;
3411    
3412    Changes:
3413    
3414    1.  Changed FTAN to FPTAN so that the assembly output is correct.
3415    2.  Changed the extension callback for FTANGENT to generate:
3416    
3417              fptan
3418              fstp  %st(0)
3419        instead of
3420              fptan
3421              fstpl ftempmem
3422    
3423    3.  Numerous assembly fixes for x86.
3424    
3425    5.  Cleaned up the machine code output module x86/x86MC.sml and added
3426        support for a whole bunch of instructions and addressing modes:
3427    
3428          fadd/fsub/fsubr/fmul/fdiv/fdivr  %st, %st(n)
3429          faddp/fsubp/fsubrp/fmulp/fdivp/fdivrp  %st, %st(n)
3430          fadd/fsub/fsubr/fmul/fdiv/fdivr  %st(n), %st
3431          fiadd/fisub/fisubr/fimul/fidiv/fidivr mem
3432          fxch %st(n)
3433          fld %st(n)
3434          fst %st(n)
3435          fst mem
3436          fstp %st(n)
3437          fucom %st(n)
3438          fucomp %st(n)
3439    
3440        All these are now generated when the fast fp mode is turned on.
3441    
3442    6.  Removed the dedicated registers %st(0), ..., %st(7) from X86CpsRegs
3443    
3444    ----------------------------------------------------------------------
3445    Name: Matthias Blume
3446    Date: 2000/11/09 11:20:00 JST
3447    Tag: blume-20001109-scc
3448    Description:
3449    
3450    Eliminated some code duplication:
3451    
3452    1. Added "where" clause to GraphSCCFn in SML/NJ Library.
3453       (Otherwise the functor is useless.)
3454    2. Used GraphSCCFn where SCCUtilFun was used previously.
3455    3. Got rid of SCCUtilFun (in comp-lib.cm).
3456    
3457    ----------------------------------------------------------------------
3458    Name: Lal George
3459    Date: 2000/11/06 09:02:21 EST 2000
3460    Tag: Release_110_30
3461    Description:
3462    
3463    - Version 110.30
3464    ----------------------------------------------------------------------
3465    Name: Matthias Blume
3466    Date: 2000/11/04 14:45:00
3467    Tag: blume-20001104-mlbuild
3468    Description:
3469    
3470    - Made ml-build faster on startup.
3471    - Documentation fixes.
3472    
3473    ----------------------------------------------------------------------
3474    Name: Matthias Blume
3475    Date: 2000/11/02 17:00:00 JST
3476    Tag: blume-20001102-condcomp
3477    Description:
3478    
3479    - Small tweaks to pickler -- new BOOTFILES!
3480    - Version bumped to 110.29.2.
3481    - Added conditional compilation facility to init.cmi (see comment there).
3482    ----------------------------------------------------------------------
3483    Name: Allen Leung
3484    Date: 2000/10/23 19:31:00
3485    Tag: leunga-20001023-demo-ra
3486    
3487    1. Minor RA changes that improves spilling on x86 (affects Moby and C-- only)
3488    2. Test programs for the graph library updated
3489    3. Some new MLRISC demo programs added
3490    
3491    ----------------------------------------------------------------------
3492    Name: Matthias Blume
3493    Date: 2000/08/31 22:15:00 JST
3494    Tag: blume-20001017-errmsg
3495    Description:
3496    
3497    More error message grief: Where there used to be no messages, there
3498    now were some that had bogus error regions.  Fixed.
3499    
3500    ----------------------------------------------------------------------
3501    Name: Matthias Blume
3502    Date: 2000/08/31 17:30:00 JST
3503    Tag: blume-20001017-v110p29p1
3504    Description:
3505    
3506    I made a version 110.29.1 with new bootfiles.
3507    
3508    Changes:  Modified pickler/unpickler for faster and leaner unpickling.
3509              CM documentation changes and a small bugfix in CM's error reporting.
3510    
3511    ----------------------------------------------------------------------
3512    Name: Lal George
3513    Date: 2000/09/27 14:42:35 EDT
3514    Tag: george-20000927-nodestatus
3515    Description:
3516    
3517    Changed the type of the nodestatus, so that:
3518    
3519            SPILLED(~1)             is now SPILLED
3520            SPILLED(m) where m>=0   is now MEMREG(m)
3521            SPILLED(s) where s<~1   is now SPILL_LOC(~s)
3522    
3523    ----------------------------------------------------------------------
3524    Name: Matthias Blume
3525    Date: 2000/09/07 14:45:00 JST
3526    Tag: blume-20000907-cmerrmsg
3527    Description:
3528    
3529    Small tweak to CM to avoid getting ML syntax error messages twice.
3530    
3531    ----------------------------------------------------------------------
3532    Name: Matthias Blume
3533    Date: 2000/08/31 18:00:00 JST
3534    Tag: blume-20000831-cvsbootfiles
3535    Description:
3536    
3537    New URL for boot files (because the 110.29 files on the BL server do
3538    now work correctly with my updated install scripts for yacc and lex).
3539    
3540    ----------------------------------------------------------------------
3541    Name: Matthias Blume
3542    Date: 2000/08/08 12:33:00 JST
3543    Tag: blume-20000808-manual
3544    Description:
3545    
3546    Tiny update to CM manual.
3547    
3548    ----------------------------------------------------------------------
3549    Name: Allen Leung
3550    Date: 2000/08/7 19:31:00
3551    Tag: leunga-20000807-a-whole-bunch-of-stuff
3552    
3553      Moby, C--, SSA, x86, machine descriptions etc.  Should only affect C--
3554    and Mobdy.
3555    
3556    1.  x86
3557    
3558       a.  Fixes to peephole module by John and Dan.
3559       b.  Assembly fix to SETcc by Allen.
3560       c.  Fix to c-call by John.
3561       d.  Fix to spilling by John.  (This one deals with the missing FSTPT case)
3562       e.  Instruction selection optimization to SETcc as suggested by John.
3563    
3564           For example,
3565    
3566            MV(32, x, COND(32, CMP(32, LT, a, b), LI 1, LI 0))
3567    
3568           should generate:
3569    
3570            MOVL a, x
3571            SUBL b, x
3572            SHRL 31, x
3573    
3574    2.  IR stuff
3575    
3576         A bunch of new DJ-graph related algorithms added.  These
3577         speed up SSA construction.
3578    
3579    3.  SSA + Scheduling
3580    
3581         Added code for SSA and scheduling to the repository
3582    
3583    ----------------------------------------------------------------------
3584    Name: Lal George
3585    Date: 2000/07/27 11:53:14 EDT
3586    
3587    Tag: lal-20000727-linux-ppc
3588    Description:
3589    
3590     Made changes to support Linux PPC.
3591     p.s. I have confirmation that the 110.29 boot files work fine.
3592    
3593    ----------------------------------------------------------------------
3594    Name: Matthias Blume
3595    Date: 2000/07/27 17:40:00 JST
3596    Tag: blume-20000727-scripts
3597    Description:
3598    
3599    !!!! WARNING !!!!
3600    You must recompile the runtime system!
3601    !!!! WARNING !!!!
3602    
3603    This is basically another round of script-enhancements:
3604    
3605    1. sml, ml-build, and ml-makedepend accept options -D and -U to define
3606       and undefine CM preprocessor symbols.
3607    
3608    2. ml-build avoids generating a new heap image if it finds that the
3609       existing one is still ok.  (The condition is that no ML file had to
3610       be recompiled and all ML files are found to be older that the heap
3611       file.)
3612    
3613       To make this work smoothly, I also hacked the runtime system as
3614       well as SMLofNJ.SysInfo to get access to the heap image suffix
3615       (.sparc-solaris, ...) that is currently being used.
3616    
3617       Moreover, the signature of CM.mk_standalone has changed.  See the
3618       CM manual.
3619    
3620    3. ml-makedepend accepts additional options -n, -a, and -o.  (See the
3621       CM manual for details.)
3622