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Diff of /sml/trunk/HISTORY

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revision 590, Sat Apr 1 02:24:08 2000 UTC revision 1037, Sat Jan 26 02:27:14 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: 2001/01/25 21:27:00 EST
18    Tag: Release_110_38
19    Description:
20    
21    Call it a (working) release!  Version is 110.38. Bootfiles are ready.
22    
23    README will be added later.
24    
25    ----------------------------------------------------------------------
26    Name: Matthias Blume
27    Date: 2002/01/25
28    Tag: blume-20020125-ffi
29    Description:
30    
31    A large number of tweaks and improvements to ml-nlffi-lib and
32    ml-nlffigen:
33    
34       - ML represenation types have been streamlined
35       - getter and setter functions work with concrete values, not abstract
36         ones where possible
37       - ml-nlffigen command line more flexible (see README file there)
38       - some bugs have been fixed (hopefully)
39    
40    ----------------------------------------------------------------------
41    Name: Lal George
42    Date: 2002/01/24
43    Tag: george-20020124-risc-ra-interface
44    Description:
45    
46       There is a dramatic simplification in the interface to the
47       register allocator for RISC architectures as a result of making
48       parallel copy instructions explicit.
49    
50    ----------------------------------------------------------------------
51    Name: Matthias Blume
52    Date: 2002/01/22
53    Tag: blume-20020122-x86-ccalls
54    Description:
55    
56    Bug fix for c-calls on x86 (having to do with how char- and
57    short-arguments are being handled).
58    
59    ----------------------------------------------------------------------
60    Name: Matthias Blume
61    Date: 2002/01/21
62    Tag: blume-20020121-ff
63    Description:
64    
65    Another day of fiddling with the FFI...
66    
67    1. Bug fix/workaround:  CKIT does not complain about negative array
68       dimensions, so ml-nlffigen has to guard itself against this possibility.
69       (Otherwise a negative dimension would send it into an infinite loop.)
70    
71    2. Some of the abstract types (light objects, light pointers, most "base"
72       types) in structure C are now eqtypes.
73    
74    3. Added constructors and test functions for NULL function pointers.
75    
76    ----------------------------------------------------------------------
77    Name: Matthias Blume
78    Date: 2002/01/18
79    Tag: blume-20020118-ready-for-new-release
80    Description:
81    
82    Made config/srcarchiveurl point to a new place.  (Will provide boot
83    files shortly.)
84    
85    Maybe we christen this to be 110.38?
86    
87    ----------------------------------------------------------------------
88    Name: Matthias Blume
89    Date: 2002/01/18
90    Tag: blume-20020118-more-ffifiddle
91    Description:
92    
93    Today's FFI fiddling:
94    
95      - Provided a structure CGetSet with "convenient" versions of C.Get.* and
96        C.Set.* that use concrete (MLRep.*) arguments and results instead
97        of abstract ones.
98    
99      - Provided word-style bit operations etc. for "int" representation
100        types in MLRep.S<Foo>Bitops where <Foo> ranges over Char, Int, Short,
101        and Long.
102    
103    ----------------------------------------------------------------------
104    Name: Matthias Blume
105    Date: 2002/01/18
106    Tag: blume-20020118-use-x86-fp
107    Description:
108    
109    Now that x86-fast-fp seems to be working, I turned it back on again
110    by default.  (Seems to work fine now, even with the FFI.)
111    
112    Other than that, I added some documentation about the FFI to
113    src/ml-nlffigen/README and updated the FFI test examples in
114    src/ml-nlffi-lib/Tests/*.
115    
116    ----------------------------------------------------------------------
117    Name: Allen Leung
118    Date: 2002/01/17
119    Tag: leunga-20020117-x86-fast-fp-call
120    Description:
121    
122       1. Fixed a problem with handling return fp values when x86's fast fp
123          mode is turned on.
124    
125       2. Minor pretty printing fix for cellset.  Print %st(0) as %st(0) instead
126          of %f32.
127    
128       3. Added a constructor INT32lit to the ast of MLRISC tools.
129    
130    ----------------------------------------------------------------------
131    Name: Matthias Blume
132    Date: 2002/01/16
133    Tag: blume-20020116-ffifiddle
134    Description:
135    
136    More fiddling with the FFI interface:
137    
138     - Make constness 'c instead of rw wherever possible.  This eliminates
139       the need for certain explicit coercions.  (However, due to ML's
140       value polymorphism, there will still be many cases where explicit
141       coercions are necessary.  Phantom types are not the whole answer
142       to modeling a subtyping relationship in ML.)
143    
144     - ro/rw coersions for pointers added.  (Avoids the detour through */&.)
145    
146     - "printf" test example added to src/ml-nlffi-lib/Tests.  (Demonstrates
147       clumsy workaround for varargs problem.)
148    
149    ----------------------------------------------------------------------
150    Name: Lal George
151    Date: 2002/01/15
152    Tag: <none>
153    Description:
154    
155    1. Since COPY instructions are no longer native to the architecture,
156       a generic functor can be used to implement the expandCopies function.
157    
158    2. Allowed EXPORT and IMPORT pseudo-op declarations to appear inside a
159       TEXT segment.
160    
161    ----------------------------------------------------------------------
162    Name: Matthias Blume
163    Date: 2002/01/15
164    Tag: blume-20020115-ffiupdates
165    Description:
166    
167    1. Fix for bug resulting in single-precision float values being returned
168       incorrectly from FFI calls.
169    
170    2. Small modifications to C FFI API:
171    
172        - memory-allocation routines return straight objects (no options)
173          and raise an exception in out-of-memory situations
174        - unsafe extensions to cast between function pointers and pointers
175          from/to ints
176        - added structure C_Debug as an alternative to structure C where
177          pointer-dereferencing (|*| and |*!) always check for null-pointers
178        - added open_lib' to DynLinkage;  open_lib' works like open_lib
179          but also takes a (possibly empty) list of existing library handles
180          that the current library depends on
181    
182    ----------------------------------------------------------------------
183    Name: Matthias Blume
184    Date: 2002/01/10
185    Tag: blume-20020110-newffigen
186    Description:
187    
188    1. Updates to portable graph code.
189    
190    2. Major update to ml-nlffigen and ml-nlffi-lib.  Things are much
191       more scalable now so that even huge interfaces such as the one
192       for GTK compile in finite time and space. :-)
193       See src/ml-nlffigen/README for details on what's new.
194    
195    ----------------------------------------------------------------------
196    Name: Lal George
197    Date: 2001/01/09 14:31:35 EST 2002
198    Tag: george-20011206-rm-native-copy
199    Description:
200    
201            Removed the native COPY and FCOPY instructions
202            from all the architectures and replaced it with the
203            explicit COPY instruction from the previous commit.
204    
205            It is now possible to simplify many of the optimizations
206            modules that manipulate copies. This has not been
207            done in this change.
208    
209    ----------------------------------------------------------------------
210    Name: Lal George
211    Date: 2001/12/06 16:50:13 EST 2001
212    Tag: george-20011206-mlrisc-instruction
213    Description:
214    
215    Changed the representation of instructions from being fully abstract
216    to being partially concrete. That is to say:
217    
218      from
219            type instruction
220    
221      to
222            type instr                              (* machine instruction *)
223    
224            datatype instruction =
225                LIVE of {regs: C.cellset, spilled: C.cellset}
226              | KILL of {regs: C.cellset, spilled: C.cellset}
227              | COPYXXX of {k: CB.cellkind, dst: CB.cell list, src: CB.cell list}
228              | ANNOTATION of {i: instruction, a: Annotations.annotation}
229              | INSTR of instr
230    
231    This makes the handling of certain special instructions that appear on
232    all architectures easier and uniform.
233    
234    LIVE and KILL say that a list of registers are live or killed at the
235    program point where they appear. No spill code is generated when an
236    element of the 'regs' field is spilled, but the register is moved to
237    the 'spilled' (which is present, more for debugging than anything else).
238    
239    LIVE replaces the (now deprecated) DEFFREG instruction on the alpha.
240    We used to generate:
241    
242            DEFFREG f1
243            f1 := f2 + f3
244            trapb
245    
246    but now generate:
247    
248            f1 := f2 + f3
249            trapb
250            LIVE {regs=[f1,f2,f3], spilled=[]}
251    
252    Furthermore, the DEFFREG (hack) required that all floating point instruction
253    use all registers mentioned in the instruction. Therefore f1 := f2 + f3,
254    defines f1 and uses [f1,f2,f3]! This hack is no longer required resulting
255    in a cleaner alpha implementation. (Hopefully, intel will not get rid of
256    this architecture).
257    
258    COPYXXX is intended to replace the parallel COPY and FCOPY  available on
259    all the architectures. This will result in further simplification of the
260    register allocator that must be aware of them for coalescing purposes, and
261    will also simplify certain aspects of the machine description that provides
262    callbacks related to parallel copies.
263    
264    ANNOTATION should be obvious, and now INSTR represents the honest to God
265    machine instruction set!
266    
267    The <arch>/instructions/<arch>Instr.sml files define certain utility
268    functions for making porting easier -- essentially converting upper case
269    to lower case. All machine instructions (of type instr) are in upper case,
270    and the lower case form generates an MLRISC instruction. For example on
271    the alpha we have:
272    
273      datatype instr =
274         LDA of {r:cell, b:cell, d:operand}
275       | ...
276    
277      val lda : {r:cell, b:cell, d:operand} -> instruction
278        ...
279    
280    where lda is just (INSTR o LDA), etc.
281    
282    ----------------------------------------------------------------------
283    Name: Matthias Blume
284    Date: 2001/11/22 21:40:00 EST
285    Tag: Release_110_37
286    Description:
287    
288    Release 110.37.  This time for real.
289    
290    ----------------------------------------------------------------------
291    Name: Matthias Blume
292    Date: 2001/11/21 16:35:00 EST
293    Tag: blume-20011121-foot-in-mouth
294    Description:
295    
296    Removed the "Release_110_37" tag because of a serious bug.
297    This will be re-tagged once the bug is fixed.
298    
299    ----------------------------------------------------------------------
300    Name: Matthias Blume
301    Date: 2001/11/21 16:14:00 EST
302    Tag: blume-20011121-forgottenfile
303    Description:
304    
305    Forgot to add a file.  (Just a .tex-file -- part of
306    the CM manual source.)
307    
308    ----------------------------------------------------------------------
309    Name: Matthias Blume
310    Date: 2001/11/21 16:10:00 EST
311    Tag: blume-20011121-invalid_110_37
312    Description:
313    
314    Note: I removed the original tag "Release_110_37" from this commit
315          because we found a serious bug in all non-x86 backends.
316          - Matthias
317    
318    1. Modifications to the SML/NJ code generator and to the runtime system
319       so that code object name strings are directly inserted into code
320       objects at code generation time.  The only business the runtime system
321       has with this is now to read the name strings on occasions.
322       (The encoding of the name string has also changed somewhat.)
323    
324    2. CM now implements a simple "set calculus" for specifying export lists.
325       In particular, it is now possible to refer to the export lists of
326       other libraries/groups/sources and form unions as well as differences.
327       See the latest CM manual for details.
328    
329    3. An separate notion of "proxy" libraries has again be eliminated from
330       CM's model.  (Proxy libraries are now simply a special case of using
331       the export list calculus.)
332    
333    4. Some of the existing libraries now take advantage of the new set
334       calculus.
335       (Notice that not all libraries have been converted because some
336       of the existing .cm-files are supposed to be backward compatible
337       with 110.0.x.)
338    
339    5. Some cleanup in stand-alone programs.  (Don't use "exnMessage" -- use
340       "General.exnMessage"!  The former relies on a certain hook to be
341       initialized, and that often does not happen in the stand-alone case.)
342    
343    ----------------------------------------------------------------------
344    Name: Lal George
345    Date: 2001/11/21  13:56:18 EST
346    Tag: george-2001121-pseudo-ops
347    Description:
348    
349      Implemented a complete redesign of MLRISC pseudo-ops. Now there
350      ought to never be any question of incompatabilities with
351      pseudo-op syntax expected by host assemblers.
352    
353      For now, only modules supporting GAS syntax are implemented
354      but more should follow, such as MASM, and vendor assembler
355      syntax, e.g. IBM as, Sun as, etc.
356    
357    ----------------------------------------------------------------------
358    Name: Matthias Blume
359    Date: 2001/11/14 11:52:00 EST
360    Tag: blume-20011114-srcname
361    Description:
362    
363    1. Routed the name of the current source file to mlriscgen where it
364       should be directly emitted into the code object.  (This last part
365       is yet to be done.)
366    
367    2. Some cleanup of the pgraph code to make it match the proposal that
368       I put out the other day.  (The proposal notwithstanding, things are
369       still in flux here.)
370    
371    ----------------------------------------------------------------------
372    Name: Lal George
373    Date: 2001/11/14 09:44:04 EST
374    Tag:
375    Description:
376    
377      Fix for a backpatching bug reported by Allen.
378    
379      Because the boundary between short and long span-dependent
380      instructions is +/- 128, there are an astounding number of
381      span-dependent instructions whose size is over estimated.
382    
383      Allen came up with the idea of letting the size of span
384      dependent instructions be non-monotonic, for a maxIter
385      number of times, after which the size must be monotonically
386      increasing.
387    
388      This table shows the number of span-dependent instructions
389      whose size was over-estimated as a function of maxIter, for the
390      file Parse/parse/ml.grm.sml:
391    
392         maxIter            # of instructions:
393            10                      687
394            20                      438
395            30                      198
396            40                        0
397    
398      In compiling the compiler, there is no significant difference in
399      compilation speed between maxIter=10 and maxIter=40. Actually,
400      my measurements showed that maxIter=40 was a tad faster than
401      maxIter=10! Also 96% of the  files in the compiler reach a fix
402      point within 13 iterations, so fixing maxIter at 40, while high,
403      is okay.
404    
405    ----------------------------------------------------------------------
406    Name: Matthias Blume
407    Date: 2001/10/31 15:25:00 EST
408    Tag: blume-20011031-pgraph
409    Description:
410    
411    CKIT:
412    * Changed the "Function" constructor of type Ast.ctype to carry optional
413      argument identifiers.
414    * Changed the return type of TypeUtil.getFunction accordingly.
415    * Type equality ignores the argument names.
416    * TypeUtil.composite tries to preserve argument names but gives up quickly
417      if there is a mismatch.
418    
419    installation script:
420    * attempts to use "curl" if available (unless "wget" is available as well)
421    
422    CM:
423    * has an experimental implementation of "portable graphs" which I will
424      soon propose as an implementation-independent library format
425    * there are also new libraries $/pgraph.cm and $/pgraph-util.cm
426    
427    NLFFI-LIB:
428    * some cleanup (all cosmetic)
429    
430    NLFFIGEN:
431    * temporarily disabled the mechanism that suppresses ML output for
432      C definitions whose identifiers start with an underscore character
433    * generate val bindings for enum constants
434    * user can request that only one style (light or heavy) is being used;
435      default is to use both (command-line arguments: -heavy and -light)
436    * fixed bug in handling of function types involving incomplete pointers
437    * generate ML entry points that take record arguments (i.e., using
438      named arguments) for C functions that have a prototype with named
439      arguments
440      (see changes to CKIT)
441    
442    ----------------------------------------------------------------------
443    Name: Allen Leung
444    Date: 2001/10/27 20:34:00 EDT
445    Tag: leunga-20011027-x86-fast-fp-call
446    Description:
447    
448       Fixed the bug described in blume-20010920-slowfp.
449    
450       The fix involves
451          1. generating FCOPYs in FSTP in ia32-svid
452          2. marking a CALL with the appropriate annotation
453    
454    ----------------------------------------------------------------------
455    Name: Matthias Blume
456    Date: 2001/10/16 11:32:00 EDT
457    Tag: blume-20011016-netbsd
458    Description:
459    
460    Underscore patch from Chris Richards (fixing problem with compiling
461    runtime system under recent NetBSD).
462    
463    ----------------------------------------------------------------------
464    Name: Allen Leung
465    Date: 2001/10/12 17:18:32 EDT 2001
466    Tag: leung-20011012-x86-printflowgraph
467    Description:
468    
469    X86RA now uses a valid (instead of dummy) PrintFlowgraph module.
470    
471    ----------------------------------------------------------------------
472    Name: Lal George
473    Date: 2001/10/11 23:51:34 EDT
474    Tag: george-20011011-too-many-instrs
475    Description:
476    
477    The representation of a program point never expected to see more
478    than 65536 instructions in a basic block!
479    
480    ----------------------------------------------------------------------
481    Name: Lal George
482    Date: 2001/10/09 09:41:37 EDT
483    Tag: george-20011008-mlrisc-labels
484    Description:
485    
486    Changed the machine description files to support printing of
487    local and global labels in assembly code, based on host assembler
488    conventions.
489    
490    ----------------------------------------------------------------------
491    Name: Matthias Blume
492    Date: 2001/09/25 15:25:00 EDT
493    Tag: blume-20010925-exninfo
494    Description:
495    
496    I provided a non-hook implementation of exnName (at the toplevel) and
497    made the "dummy" implementation of exnMessage (at the toplevel) more
498    useful: if nothing gets "hooked in", then at least you are going to
499    see the exception name and a message indicating why you don't see more.
500    
501    [For the time being, programs that need exnMessage and want to use
502    ml-build should either use General.exnMessage (strongly recommended) or
503    refer to structure General at some other point so that CM sees a
504    static dependency.]
505    
506    [Similar remarks go for "print" and "use":  If you want to use their
507    functionality in stand-alone programs generated by ml-build, then use
508    TextIO.output and Backend.Interact.useFile (from $smlnj/compiler.cm).]
509    
510    ----------------------------------------------------------------------
511    Name: Matthias Blume
512    Date: 2001/09/20 17:28:00 EDT
513    Tag: blume-20010920-slowfp
514    Description:
515    
516    Allen says that x86-fast-fp is not safe yet, so I turned it off again...
517    
518    ----------------------------------------------------------------------
519    Name: Matthias Blume
520    Date: 2001/09/20 17:20:00 EDT
521    Tag: blume-20010920-canonicalpaths
522    Description:
523    
524    0. Updated the BOOT file (something that I forgot to do earlier).
525    
526    1. Small internal change to CM so that it avoids "/../" in filenames
527       as much as possible (but only where it is safe).
528    
529    2. Changed config/_run-sml (resulting in a changed bin/.run-sml) so
530       that arguments that contain delimiters are passed through correctly.
531       This change also means that all "special" arguments of the form
532       @SMLxxx... must come first.
533    
534    3. Changed install script to put relative anchor names for tool commands
535       into pathconfig.
536    
537    ----------------------------------------------------------------------
538    Name: Matthias Blume
539    >>>>>>> 1.169
540    Date: 2001/09/18 15:35:00 EDT
541    Tag: blume-20010918-readme11036
542    Description:
543    
544    Added README files.
545    
546    ----------------------------------------------------------------------
547    Name: Matthias Blume
548    Date: 2001/09/18 11:45:00 EDT
549    Tag: Release_110_36 (retag)
550    Description:
551    
552    Fixed mistake in config/preloads. Retagged as 110.36.
553    
554    ----------------------------------------------------------------------
555    Name: Matthias Blume
556    Date: 2001/09/18 09:40:00 EDT
557    Tag: Release_110_36_orig (tag changed)
558    Description:
559    
560    New version (110.36).  New bootfiles.
561    
562    ----------------------------------------------------------------------
563    Name: Matthias Blume
564    Date: 2001/09/14 16:15:00 EDT
565    Tag: blume-20010914-x86fastfp
566    Description:
567    
568    John committed some changes that Allen made, in particular a (hopefully)
569    correctly working version of the x86-fp module.
570    
571    I changed the default setting of the Control.MLRISC.getFlag "x86-fast-fp"
572    flag to "true".  Everything seems to compile to a fixpoint ok, and
573    "mandelbrot" speeds up by about 15%.
574    
575    ----------------------------------------------------------------------
576    Name: Matthias Blume
577    Date: 2001/09/13 11:20:00 EDT
578    Tag: blume-20010913-minimal
579    Description:
580    
581    1. Stefan Monnier's patch to fix a miscompilation problem that
582       was brought to light by John Reppy's work on Moby.
583    
584    2. Implemented a minimal "structure Compiler" that contains just
585       "version" and "architecture".  The minimal version will be
586       available when the full version is not.  This is for backward-
587       compatibility with code that wants to test Compiler.version.
588    
589    ----------------------------------------------------------------------
590    Name: Matthias Blume
591    Date: 2001/08/28 14:03:00 EDT
592    Tag: blume-20010828-ml-lex
593    Description:
594    
595    Fix for bug 1581, received from Neophytos Michael.
596    
597    ----------------------------------------------------------------------
598    Name: Matthias Blume
599    Date: 2001/08/27 11:20:00 EDT
600    Tag: blume-20010827-readme11035
601    Description:
602    
603    Fleshed out the README file for 110.35.
604    
605    ----------------------------------------------------------------------
606    Name: Matthias Blume
607    Date: 2001/08/24 17:10:00 EDT
608    Tag: Release_110_35
609    Description:
610    
611    New version number (110.35).  New bootfiles.
612    
613    ----------------------------------------------------------------------
614    Name: Lal George
615    Date: 2001/08/24 13:47:18 EDT 2001
616    Tag: george-20010824-MLRISC-graphs
617    Description:
618    
619     removed clusters from MLRISC completely and replaced with graphs.
620    
621    ----------------------------------------------------------------------
622    Name: Matthias Blume
623    Date: 2001/08/23 17:50:00 EDT
624    Tag: blume-20010823-toplevel
625    Description:
626    
627    - some reorganization of the code that implements various kinds of
628      environments in the compiler (static, dynamic, symbolic, combined)
629    - re-implemented the EnvRef module so that evalStream works properly
630      (if the stream contains references to "use", "CM.make", etc.)
631    - cleaned up evalloop.sml and interact.sml (but they need more cleaning)
632    
633    ----------------------------------------------------------------------
634    Name: Matthias Blume
635    Date: 2001/08/20 15:50 EDT
636    Tag: blume20010820-slipup
637    Description:
638    
639    I forgot to commit a few files.  Here they are...
640    
641    ----------------------------------------------------------------------
642    Name: Matthias Blume
643    Date: 2001/08/20 15:35:00 EDT
644    Tag: blume-20010820-debugprof
645    Description:
646    
647    !!!! NEW BOOTFILES !!!!
648    
649    This is another round of reorganizing the compiler sources.  This
650    time the main goal was to factor out all the "instrumentation"
651    passes (for profiling and backtracing) into their own library.
652    The difficulty was to do it in such a way that it does not depend
653    on elaborate.cm but only on elabdata.cm.
654    
655    Therefore there have been further changes to both elaborate.cm and
656    elabdata.cm -- more "generic" things have been moved from the former
657    to the latter.  As a result, I was forced to split the assignment
658    of numbers indicating "primtyc"s into two portions: SML-generic and
659    SML/NJ-specific.  Since it would have been awkward to maintain,
660    I bit the bullet and actually _changed_ the mapping between these
661    numbers and primtycs.  The bottom line of this is that you need
662    a new set of bin- and bootfiles.
663    
664    I have built new bootfiles for all architectures, so doing a fresh
665    checkout and config/install.sh should be all you need.
666    
667    The newly created library's name is
668    
669        $smlnj/viscomp/debugprof.cm
670    
671    and its sources live under
672    
673        src/compiler/DebugProf
674    
675    ----------------------------------------------------------------------
676    Name: Matthias Blume
677    Date: 2001/08/15 17:15:00 EDT
678    Tag: blume-20010815-compreorg
679    Description:
680    
681    This is a first cut at reorganizing the CM libraries that make up the
682    core of the compiler.  The idea is to separate out pieces that could
683    be used independently by tools, e.g., the parser, the typechecker, etc.
684    
685    The current status is a step in this direction, but it is not quite
686    satisfactory yet.  Expect more changes in the future.
687    
688    Here is the current (new) organization...
689    
690        What used to be $smlnj/viscomp/core.cm is now divided into
691        six CM libraries:
692    
693             $smlnj/viscomp/basics.cm
694                           /parser.cm
695                           /elabdata.cm
696                           /elaborate.cm
697                           /execute.cm
698                           /core.cm
699    
700        The CM files for these libraries live under src/system/smlnj/viscomp.
701        All these libraries are proxy libraries that contain precisely
702        one CM library component.  Here are the locations of the components
703        (all within the src/compiler tree):
704    
705             Basics/basics.cm
706             Parse/parser.cm
707             ElabData/elabdata.cm
708             Elaborator/elaborate.cm
709             Execution/execute.cm
710             core.cm
711    
712         [This organization is the same that has been used already
713         for a while for the architecture-specific parts of the visible
714         compiler and for the old version of core.cm.]
715    
716         As you will notice, many source files have been moved from their
717         respective original locations to a new home in one of the above
718         subtrees.
719    
720         The division of labor between the new libraries is the following:
721    
722             basics.cm:
723                - Simple, basic definitions that pertain to many (or all) of
724                  the other libraries.
725             parser.cm:
726                - The SML parser, producing output of type Ast.dec.
727                - The type family for Ast is also defined and exported here.
728             elabdata.cm:
729                - The datatypes that describe input and output of the elaborator.
730                  This includes types, absyn, and static environments.
731             elaborator.cm:
732                - The SML/NJ type checker and elaborator.
733                  This maps an Ast.dec (with a given static environment) to
734                  an Absyn.dec (with a new static environment).
735                - This libraries implements certain modules that used to be
736                  structures as functors (to remove dependencies on FLINT).
737             execute.cm:
738                - Everything having to do with executing binary code objects.
739                - Dynamic environments.
740             core.cm:
741                - SML/NJ-specific instantiations of the elaborator and MLRISC.
742                - Top-level modules.
743                - FLINT (this should eventually become its own library)
744    
745    Notes:
746    
747    I am not 100% happy with the way I separated the elaborator (and its
748    data structures) from FLINT.  Two instances of the same problem:
749    
750        1. Data structures contain certain fields that carry FLINT-specific
751           information.  I hacked around this using exn and the property list
752           module from smlnj-lib.  But the fact that there are middle-end
753           specific fields around at all is a bit annoying.
754    
755        2. The elaborator calculates certain FLINT-related information.  I tried
756           to make this as abstract as I could using functorization, but, again,
757           the fact that the elaborator has to perform calculations on behalf
758           of the middle-end at all is not nice.
759    
760        3. Having to used exn and property lists is unfortunate because it
761           weakens type checking.  The other alternative (parameterizing
762           nearly *everything*) is not appealing, though.
763    
764    I removed the "rebinding =" warning hack because due to the new organization
765    it was awkward to maintain it.  As a result, the compiler now issues some of
766    these warnings when compiling init.cmi during bootstrap compilation. On
767    the plus side, you also get a warning when you do, for example:
768       val op = = Int32.+
769    which was not the case up to now.
770    
771    I placed "assign" and "deref" into the _Core structure so that the
772    code that deals with the "lazy" keyword can find them there.  This
773    removes the need for having access to the primitive environment
774    during elaboration.
775    
776    ----------------------------------------------------------------------
777    Name: Matthias Blume
778    Date: 2001/08/13
779    Tag: blume-20010813-closures
780    Description:
781    
782    This fix was sent to us by Zhong Shao.  It is supposed to improve the
783    performance of certain loops by avoiding needless closure allocation.
784    
785    ----------------------------------------------------------------------
786    Name: Lal George
787    Date: 2001/07/31 10:03:23 EDT 2001
788    Tag: george-20010731-x86-fmalloc
789    Description: Fixed bug in x86 calls
790    
791        There was a bug where call instructions would mysteriously
792        vanish. The call instruction had to be one that returned
793        a floating point value.
794    
795    ----------------------------------------------------------------------
796    Name: Lal George
797    Date: 2001/07/19 16:36:29 EDT 2001
798    Tag: george-20010719-simple-cells
799    Description:
800    
801    I have dramatically simplified the interface for CELLS in MLRISC.
802    
803    In summary, the cells interface is broken up into three parts:
804    
805      1. CellsBasis : CELLS_BASIS
806    
807            CellsBasis is a top level structure and common for all
808            architectures.  it contains the definitions of basic datatypes
809            and utility  functions over these types.
810    
811      2. functor Cells() : CELLS
812    
813            Cells generates an interface for CELLS that incorporates the
814            specific resources on the target architecture, such as the
815            presence of special register classes, their number and size,
816            and various useful substructures.
817    
818      3. <ARCH>CELLS
819    
820            e.g. SparcCells: SPARCCELLS
821    
822            <ARCH>CELLS usually contains additional bindings for special
823            registers  on the architecture, such as:
824    
825                    val r0 : cell           (* register zero *)
826                    val y : cell            (* Y register *)
827                    val psr : cell          (* processor status register *)
828                    ...
829    
830            The structure returned by applying the Cells functor is opened
831            in this interface.
832    
833    The main implication of all this is that the datatypes for cells is
834    split between CellsBasis and CELLS -- a fairly simple change for user
835    code.
836    
837    In the old scheme the CELLS interface had a definitional binding of
838    the form:
839    
840            signature CELLS = sig
841    
842               structure CellsBasis = CellsBasis
843    
844               ...
845    
846            end
847    
848    With all the sharing constraints that goes on in MLRISC, this old
849    design  quickly leads to errors such as:
850    
851            "structure definition spec inside of sharing ... "
852    
853    
854    and appears to require an unacceptable amount of sharing and where
855    constraint hackery.
856    
857    I think this error message (the interaction of definitional specs and
858    sharing) requires more explanation on our web page.
859    
860    ----------------------------------------------------------------------
861    Name: Matthias Blume
862    Date: 2001/07/19 15:00:00 EDT
863    Tag: blume-20010719-libreorg
864    Description:
865    
866    This update puts together a fairly extensive but straightforward change
867    to the way the libraries that implement the interactive system are
868    organized:
869    
870       The biggest change is the elimination of structure Compiler.  As a
871       replacement for this structure, there is now a CM library
872       (known as $smlnj/compiler.cm or $smlnj/compiler/current.cm)
873       that exports all the substructures of the original structure Compiler
874       directly.  So instead of saying Compiler.Foo.bar one now simply
875       says Foo.bar.  (The CM libraries actually export a collection of
876       structures that is richer than the collection of substructures of
877       structure Compiler.)
878    
879       To make the transition smooth, there is a separate library called
880       $smlnj/compiler/compiler.cm which puts together and exports the
881       original structure Compiler (or at least something very close to it).
882    
883       There are five members of the original structure Compiler
884       that are not exported directly but which instead became members
885       of a new structure Backend (described by signature BACKEND).  These are:
886       structure Profile (: PROFILE), structure Compile (: COMPILE), structure
887       Interact (: INTERACT), structure Machine (: MACHINE), and val
888       architecture (: string).
889    
890       Structure Compiler.Version has become structure CompilerVersion.
891    
892       Cross-compilers for alpha32, hppa, ppc, sparc, and x86 are provided
893       by $smlnj/compiler/<arch>.cm where <arch> is alpha32, hppa, ppc, sparc,
894       or x86, respectively.
895       Each of these exports the same frontend structures that
896       $smlnj/compiler.cm exports.  But they do not have a structure Backend
897       and instead export some structure <Arch>Backend where <Arch> is Alpha32,
898       Hppa, PPC, Sparc, or X86, respectively.
899    
900       Library $smlnj/compiler/all.cm exports the union of the exports of
901       $smlnj/compiler/<arch>.cm
902    
903       There are no structures <Arch>Compiler anymore, use
904       $smlnj/compiler/<arch>.cm instead.
905    
906       Library host-compiler-0.cm is gone.  Instead, the internal library
907       that instantiates CM is now called cm0.cm.  Selection of the host
908       compiler (backend) is no longer done here but. (Responsibility for it
909       now lies with $smlnj/compiler/current.cm.  This seems to be more
910       logical.)
911    
912       Many individual files have been moved or renamed.  Some files have
913       been split into multiple files, and some "dead" files have been deleted.
914    
915    Aside from these changes to library organization, there are also changes
916    to the way the code itself is organized:
917    
918       Structure Binfile has been re-implemented in such a way that it no
919       longer needs any knowledge of the compiler.  It exclusively deals
920       with the details of binfile layout.  It no longer invokes the
921       compiler (for the purpose of creating new prospective binfile
922       content), and it no longer has any knowledge of how to interpret
923       pickles.
924    
925       Structure Compile (: COMPILE) has been stripped down to the bare
926       essentials of compilation.  It no longer deals with linking/execution.
927       The interface has been cleaned up considerably.
928    
929       Utility routines for dealing with linking and execution have been
930       moved into their own substructures.
931    
932       (The ultimate goal of these changes is to provide a light-weight
933       binfile loader/linker (at least for, e.g., stable libraries) that
934       does not require CM or the compiler to be present.)
935    
936    CM documentation has been updated to reflect the changes to library
937    organization.
938    
939    ----------------------------------------------------------------------
940    Name: Matthias Blume
941    Date: 2001/07/10 17:30:00 EDT
942    Tag: Release_110_34
943    Description:
944    
945    Minor tweak to 110.34 (re-tagged):
946    
947      - README.html file added to CVS repository
948      - runtime compiles properly under FreeBSD 3.X and 4.X
949    
950    ----------------------------------------------------------------------
951    Name: Matthias Blume
952    Date: 2001/07/10 17:30:00 EDT
953    Tag: Release_110_34
954    Description:
955    
956    New version number (110.34). New bootfiles.
957    
958    ----------------------------------------------------------------------
959    Name: Matthias Blume
960    Date: 2001/07/09 16:00:00 EDT
961    Tag: blume-20010709-more-varargs
962    Description:
963    
964    I changed the handling of varargs in ml-nlffigen again:
965    The ellipsis ... will now simply be ignored (with an accompanying warning).
966    
967    The immediate effect is that you can actually call a varargs function
968    from ML -- but you can't actually supply any arguments beyond the ones
969    specified explicitly.  (For example, you can call printf with its format
970    string, but you cannot pass additional arguments.)
971    
972    This behavior is only marginally more useful than the one before, but
973    it has the advantage that a function or, more importantly, a function
974    type never gets dropped on the floor, thus avoiding follow-up problems with
975    other types that refer to the offending one.
976    
977    ----------------------------------------------------------------------
978    Name: Matthias Blume
979    Date: 2001/07/09 11:25:00 EDT
980    Tag: blume-20010709-varargs
981    Description:
982    
983    1. ckit-lib.cm now exports structure Error
984    2. ml-nlffigen reports occurences of "..." (i.e., varargs function types)
985       with a warning accompanied by a source location.  Moreover, it
986       merely skips the offending function or type and proceeds with the
987       rest of its work.u  As a result, one can safely feed C code containing
988       "..." to ml-nlffigen.
989    3. There are some internal improvements to CM, providing slightly
990       more general string substitutions in the tools subsystem.
991    
992    ----------------------------------------------------------------------
993    Name: Matthias Blume
994    Date: 2001/06/27 15:10:00 EDT
995    Tag: blume-20010627-concur
996    Description:
997    
998    Fixed a small bug in CM's handling of parallel compilation.
999    (You could observe the bug by Control-C-interrupting an ordinary
1000    CMB.make or CM.stabilize and then attaching some compile servers.
1001    The result was that all of a sudden the previously interrupted
1002    compilation would continue on its own.  This was because of
1003    an over-optimization: CM did not bother to clean out certain queues
1004    when no servers were attached "anyway", resulting in the contents
1005    of these queues to grab control when new servers did get attached.)
1006    
1007    There is also another minor update to the CM manual.
1008    
1009    ----------------------------------------------------------------------
1010    Name: Matthias Blume
1011    Date: 2001/06/26 16:15:00 EDT
1012    Tag: blume-20010626-cmdoc
1013    Description:
1014    
1015    Minor typo fixed in CM manual (syntax diagram for libraries).
1016    
1017    ----------------------------------------------------------------------
1018    Name: Matthias Blume
1019    Date: 2001/06/25 22:55:00 EDT
1020    Tag: blume-20010625-x86pc
1021    Description:
1022    
1023    Fixed a nasty bug in the X86 assembly code that caused signal
1024    handlers to fail (crash) randomly.
1025    
1026    ----------------------------------------------------------------------
1027    Name: Matthias Blume
1028    Date: 2001/06/25 12:05:00 EDT
1029    Tag: blume-20010625-nlffigen
1030    Description:
1031    
1032    This update fixes a number of minor bugs in ml-nlffigen as reported by
1033    Nick Carter <nbc@andrew.cmu.edu>.
1034    
1035      1. Silly but ok typedefs of the form "typedef void myvoid;" are now accepted.
1036      2. Default names for generated files are now derived from the name of
1037         the C file *without its directory*.  In particular, this causes generated
1038         files to be placed locally even if the C file is in some system directory.
1039      3. Default names for generated signatures and structures are also derived
1040         from the C file name without its directory.  This avoids silly things
1041         like "structure GL/GL".
1042         (Other silly names are still possible because ml-nlffigen does not do
1043          a thorough check of whether generated names are legal ML identifiers.
1044          When in doubt, use command line arguments to force particular names.)
1045    
1046    ----------------------------------------------------------------------
1047    Name: Matthias Blume
1048    Date: 2001/06/21 12:25:00 EDT
1049    Tag: blume-20010621-eXene
1050    Description:
1051    
1052    eXene now compiles and (sort of) works again.
1053    
1054    The library name (for version > 110.33) is $/eXene.cm.
1055    
1056    I also added an new example in src/eXene/examples/nbody.  See the
1057    README file there for details.
1058    
1059    ----------------------------------------------------------------------
1060    Name: Matthias Blume
1061    Date: 2001/06/20 16:40:00 EDT
1062    Tag: blume-20010620-cml
1063    Description:
1064    
1065    CML now compiles and works again.
1066    
1067    Libraries (for version > 110.33):
1068    
1069      $cml/cml.cm            Main CML library.
1070      $cml/basis.cm          CML's version of $/basis.cm.
1071      $cml/cml-internal.cm   Internal helper library.
1072      $cml/core-cml.cm       Internal helper library.
1073      $cml-lib/trace-cml.cm  Tracing facility.
1074      $cml-lib/smlnj-lib.cm  CML's version of $/smlnj-lib.cm
1075    
1076    The installer (config/install.sh) has been taught how to properly
1077    install this stuff.
1078    
1079    ----------------------------------------------------------------------
1080    Name: Matthias Blume
1081    Date: 2001/06/19 17:55:00 EDT
1082    Tag: blume-20010619-instantiate
1083    Description:
1084    
1085    This un-breaks the fix for bug 1432.
1086    (The bug was originally fixed in 110.9 but I broke it again some
1087    time after that.)
1088    
1089    ----------------------------------------------------------------------
1090    Name: Matthias Blume
1091    Date: 2001/06/19 17:25:00 EDT
1092    Tag: blume-20010619-signals
1093    Description:
1094    
1095    This should (hopefully) fix the long-standing signal handling bug.
1096    (The runtime system was constructing a continuation record with an
1097    incorrect descriptor which would cause the GC to drop data on the floor...)
1098    
1099    ----------------------------------------------------------------------
1100    Name: Matthias Blume
1101    Date: 2001/06/15 15:05:00 EDT
1102    Tag: blume-20010615-moresparc
1103    Description:
1104    
1105    Here is a short late-hour update related to Sparc c-calls:
1106    
1107     -- made handling of double-word arguments a bit smarter
1108    
1109     -- instruction selection phase tries to collapse certain clumsily
1110        constructed ML-Trees; typical example:
1111    
1112            ADD(ty,ADD(_,e,LI d1),LI d2)  ->  ADD(ty,e,LI(d1+d2))
1113    
1114        This currently has no further impact on SML/NJ since mlriscGen does
1115        not seem to generate such patterns in the first place, and c-calls
1116        (which did generate them in the beginning) has meanwhile been fixed
1117        so as to avoid them as well.
1118    
1119    ----------------------------------------------------------------------
1120    Name: Matthias Blume
1121    Date: 2001/06/15 15:05:00 EDT
1122    Tag: blume-20010615-sparc
1123    Description:
1124    
1125    The purpose of this update is to provide an implementation of NLFFI
1126    on Sparc machines.
1127    
1128    Here are the changes in detail:
1129    
1130       * src/MLRISC/sparc/c-calls/sparc-c-calls.sml is a new file containing
1131       the Sparc implementation of the c-calls API.
1132       * The Sparc backend of SML/NJ has been modified to uniformely use %fp
1133       for accessing the ML frame.  Thus, we have a real frame pointer and
1134       can freely modify %sp without need for an omit-frame-ptr phase.
1135       The vfp logic in src/compiler/CodeGen/* has been changed to accomodate
1136       this case.
1137       * ml-nlffigen has been taught to produce code for different architectures
1138       and calling conventions.
1139       * In a way similar to what was done in the x86 case, the Sparc
1140       backend uses its own specific extension to mltree.  (For example,
1141       it needs to be able to generate UNIMP instructions which are part
1142       of the calling convention.)
1143       * ml-nlffi-lib was reorganized to make it more modular (in particular,
1144       to make it easier to plug in new machine- and os-dependent parts).
1145    
1146    There are some other fairly unrelated bug fixes and cleanups as well:
1147    
1148       * I further hacked the .cm files for MLRISC tools (like MDLGen) so
1149       that they properly share their libraries with existing SML/NJ libraries.
1150       * I fixed a minor cosmetic bug in CM, supressing certain spurious
1151       follow-up error messages.
1152       * Updates to CM/CMB documentation.
1153    
1154    TODO items:
1155    
1156       * MLRISC should use a different register as its asmTemp on the Sparc.
1157         (The current %o2 is a really bad choice because it is part of the
1158         calling conventions, so things might interfere in unexpected ways.)
1159    
1160    ----------------------------------------------------------------------
1161    Name: Matthias Blume
1162    Date: 2001/06/07
1163    Tag: blume-20010607-calls
1164    Description:
1165    
1166    A number of internal changes related to C calls and calling conventions:
1167    
1168    1. ML-Tree CALL statements now carry a "pops" field.  It indicates the
1169       number of bytes popped implicitly (by the callee).  In most cases
1170       this field is 0 but on x86/win32 it is some non-zero value.  This
1171       is information provided for the benefit of the "omit-frameptr" pass.
1172    2. The CALL instruction on the x86 carries a similar "pops" field.
1173       The instruction selection phase copies its value from the ML-Tree
1174       CALL statement.
1175    3. On all other architectures, the instruction selection phase checks
1176       whether "pops=0" and complains if not.
1177    4. The c-calls implementation for x86 now accepts two calling conventions:
1178       "ccall" and "stdcall".  When "ccall" is selected, the caller cleans
1179       up after the call and pops is set to 0.  For "stdcall", the caller
1180       does nothing, leaving the cleanup to the callee; pops is set to
1181       the number of bytes that were pushed onto the stack.
1182    5. The cproto decoder (compiler/Semant/types/cproto.sml) now can
1183       distinguish between "ccall" and "stdcall".
1184    6. The UNIMP instruction has been added to the supported Sparc instruction
1185       set. (This is needed for implementing the official C calling convention
1186       on this architecture.)
1187    7. I fixed some of the .cm files under src/MLRISC/Tools to make them
1188       work with the latest CM.
1189    
1190    ----------------------------------------------------------------------
1191    Name: Matthias Blume
1192    Date: 2001/06/05 15:10:00 EDT
1193    Tag: blume-20010605-cm-index
1194    Description:
1195    
1196    0. The "lambdasplit" parameter for class "sml" in CM has been documented.
1197    
1198    1. CM can now generate "index files".  These are human-readable files
1199       that list on a per-.cm-file basis each toplevel symbol defined or
1200       imported.  The location of the index file for
1201       <p>/<d>.cm is <p>/CM/INDEX/<d>.cm.
1202       To enable index-file generation, set CM.Control.generate_index to true
1203       or export an environment-symbol: export CM_GENERATE_INDEX=true.
1204    
1205       The CM manual has been updated accordingly.
1206    
1207    2. I made some slight modifications to the c-calls API in MLRISC.
1208    
1209         a) There is now a callback to support saving/restoring of
1210            dedicated but caller-save registers around the actual call
1211            instruction.
1212         b) One can optionally specify a comment-annotation for the
1213            call instruction.
1214    
1215    3. SML/NJ (mlriscGen.sml) uses this new API for the rawccall primop.
1216       (For example, the comment annotation shows the C prototype of
1217        the function being called.)
1218    
1219    ----------------------------------------------------------------------
1220    Name: Matthias Blume
1221    Date: 2001/06/01 13:30:00 EDT
1222    Tag: blume-20010601-nlffi-cleanup
1223    Description:
1224    
1225    This is mostly a cleanup of MLFFI stuff:
1226    
1227       - some signature files have been put into a more exposed place
1228       - the ugly 'f type parameter is gone (simplifies types tremendously!)
1229       - ml-nlffigen changed accordingly
1230       - tutorial updated
1231    
1232    Other changes:
1233    
1234       - author's affiliation in CM manual(s) updated
1235       - some more recognized keywords added to Allen's sml.sty
1236    
1237    ----------------------------------------------------------------------
1238    Name: Matthias Blume
1239    Date: 2001/05/25 15:30:00 EDT
1240    Tag: blume-20010525-iptr
1241    Description:
1242    
1243      - put the official 110.33-README (as it appears on the ftp server) under
1244        CVS
1245      - fixed a small bug related to incomplete pointer types in
1246        ml-nlffigen
1247      - small cosmetic change to the ml-nlffi-lib's "arr" type constructor
1248        (it does not need the 'f type parameter)
1249    
1250    ----------------------------------------------------------------------
1251    Name: Matthias Blume
1252    Date: 2001/05/23 14:30:00 EDT
1253    Tag: Release_110_33
1254    Description:
1255    
1256    New version number (110.33).  New bootfiles.
1257    
1258    ----------------------------------------------------------------------
1259    Name: Matthias Blume
1260    Date: 2001/05/22 18:06:00 EDT
1261    Tag: blume-20010522-targets
1262    Description:
1263    
1264    Made install.sh use file config/targets.customized if it exists, falling
1265    back to config/targets if it doesn't.  This way one can have a customized
1266    version of the targets file without touching the "real thing", thus
1267    eliminating the constant fear of accidentally checking something bogus
1268    back into the CVS repository...  (File config/targets.customized must
1269    not be added to the repository!)
1270    
1271    ----------------------------------------------------------------------
1272    Name: Matthias Blume
1273    Date: 2001/05/22 16:30:00 EDT
1274    Tag: blume-20010522-minitut
1275    Description:
1276    
1277    1. Bug fix in ml-nlffigen; now (hopefully) correctly handling
1278       struct returns.
1279    2. Added src/ml-nlffi-lib/Doc/mini-tutorial.txt.  This is some very
1280       incomplete, preliminary documentation for NLFFI.
1281    
1282    ----------------------------------------------------------------------
1283    Name: Matthias Blume
1284    Date: 2001/05/14 11:30:00 EDT
1285    Tag: blume-20010514-script
1286    Description:
1287    
1288    Some bugs in install script fixed.
1289    
1290    In addition to that I also made a slight change to the NLFFI API:
1291    Functors generated by ml-nlffigen now take the dynamic library as a
1292    straight functor argument, not as a suspended one.  (The original
1293    functor code used to force the suspension right away anyway, so there
1294    was nothing gained by this complication of the interface.)
1295    
1296    ----------------------------------------------------------------------
1297    Name: Matthias Blume
1298    Date: 2001/05/11 14:35:00 EDT
1299    Tag: blume-20010511-ml-nlffi
1300    Description:
1301    
1302    I finally took the plunge and added my new FFI code to the main
1303    repository.  For x86-linux it is now ready for prime-time.
1304    
1305    There are two new subdirectories of "src":
1306    
1307      - ml-nlffi-lib:
1308           The utility library for programs using the FFI interface.
1309           Here is the implementation of $/c.cm and its associated low-level
1310           partners $/c-int.cm and $/memory.cm.
1311      - ml-nlffigen:
1312           A stand-alone program for generating ML glue code from C source
1313           code.
1314    
1315    Building ml-nlffigen requires $/ckit-lib.cm.
1316    
1317    The config/install.sh script has been updates to do the Right Thing
1318    (hopefully).
1319    
1320    Notice that the source tree for the C-Kit will not be put under "src"
1321    but directly under the installation root directory.  (This is the
1322    structure that currently exists on the CVS server when you check out
1323    module "sml".)  Fortunately, config/install.sh knows about this oddity.
1324    
1325    Bugs: No documentation yet.
1326    
1327    ----------------------------------------------------------------------
1328    Name: Matthias Blume
1329    Date: 2001/05/09 16:35:00 EDT
1330    Tag: blume-20010509-cpscontract
1331    Description:
1332    
1333    Fixed a bug in the accounting code in cpsopt/contract.sml.  (The
1334    wrapper/unwrapper elimination did not decrement usage counts and some
1335    dead variables got overlooked by the dead-up logic.)
1336    
1337    ----------------------------------------------------------------------
1338    Name: Lal George
1339    Date: 2001/05/08  17:26:09 EDT
1340    Tag: george-20010508-omit-frameptr
1341    Description:
1342    
1343    Changes to implement the omit-frame-pointer optimization to support
1344    raw C calls. For now, there is only support on the Intel x86, but
1345    other architectures will follow as more experience is gained with this.
1346    
1347    
1348    ----------------------------------------------------------------------
1349    Name: Matthias Blume
1350    Date: 2001/05/07 14:40:00 EDT
1351    Tag: blume-20010507-proxies
1352    Description:
1353    
1354    I made into "proxy libraries" all libraries that qualify for such a
1355    change.  (A qualifying library is a library that has another library or
1356    groups as its sole member and repeats that member's export list
1357    verbatim.  A proxy library avoids this repetition by omitting its export
1358    list, effectively inheriting the list that its (only) member exports.
1359    See the CM manual for more explanation.)
1360    The main effect is that explicit export lists for these libraries
1361    do not have to be kepts in sync, making maintenance a bit easier.
1362    
1363    I also added copyright notices to many .cm-files.
1364    
1365    Last but not least, I made a new set of bootfiles.
1366    
1367    ----------------------------------------------------------------------
1368    Name: Matthias Blume
1369    Date: 2001/05/04 17:00:00 EDT
1370    Tag: blume-20010504-cm-lsplit
1371    Description:
1372    
1373    0. John merged pending changes to $/smlnj-lib.cm
1374    
1375    1. Allen's previous change accidentally backed out of one of Lal's
1376       earlier changes.  I undid this mistake (re-introducing Lal's change).
1377    
1378    2. I used the new topOrder' function from graph-scc.sml (from $/smlnj-lib.cm)
1379       within the compiler where applicable.  There is some code simplification
1380       because of that.
1381    
1382    3. The "split" phase (in FLINT) is now part of the default list of phases.
1383       Compiler.Control.LambdaSplitting.* can be used to globally control the
1384       lambda-splitting (cross-module-inlining) engine.  In addition to that,
1385       it can now also be controlled on a per-source basis: CM has been taught
1386       a new tool parameter applicable to ML source files.
1387    
1388       - To turn lambda-splitting off completely:
1389            local open Compiler.Control.LambdaSplitting in
1390                val _ = set Off
1391            end
1392       - To make "no lambda-splitting" the global default (but allow per-source
1393         overriding); this is the initial setting:
1394            local open Compiler.Control.LambdaSplitting in
1395                val _ = set (Default NONE)
1396            end
1397       - To make "lambda-splitting with aggressiveness a" the global default
1398         (and allow per-source overriding):
1399            local open Compiler.Control.LambdaSplitting in
1400                val _ = set (Default (SOME a))
1401            end
1402    
1403       - To turn lambda-splitting off for a given ML souce file (say: a.sml)
1404         write (in the respective .cm-file):
1405            a.sml (lambdasplitting:off)
1406       - To turn lambda-splitting for a.sml on with minimal aggressiveness:
1407            a.sml (lambdasplitting:on)
1408       - To turn lambda-splitting for a.sml on with aggressiveness <a> (where
1409         <a> is a decimal non-negative integer):
1410            a.sml (lambdasplitting:<a>)
1411       - To turn lambda-splitting for a.sml on with maximal aggressiveness:
1412            a.sml (lambdasplitting:infinity)
1413       - To use the global default for a.sml:
1414            a.sml (lambdasplitting:default)
1415         or simply
1416            a.sml
1417    
1418    ----------------------------------------------------------------------
1419    Name: Allen Leung
1420    Date: 2001/05/04 01:57:00 EDT
1421    Tag: leunga-20010504-sync
1422    Description:
1423    
1424      MLRISC features.
1425    
1426      1. Fix to CMPXCHG instructions.
1427      2. Changed RA interface to allow annotations in callbacks.
1428      3. Added a new method to the stream interface to allow annotations updates.
1429    
1430    ----------------------------------------------------------------------
1431    Name: Matthias Blume
1432    Date: 2001/05/01 11:45:00 EDT
1433    Tag: blume-20010501-pcedittmp
1434    Description:
1435    
1436    Changed install.sh to use the current working directory instead of
1437    /usr/tmp for a temporary file (pcedittmp).  The previous choice
1438    of /usr/tmp caused trouble with MacOS X because of file premission
1439    problems.
1440    
1441    ----------------------------------------------------------------------
1442    Name: Matthias Blume
1443    Date: 2001/04/20 11:10:00 EDT
1444    Tag: blume-20010420-inMLflag
1445    Description:
1446    
1447     - added vp_limitPtrMask to vproc-state.h
1448       (for use by the raw-C-calls mechanism to implement proper interrupt
1449        handling)
1450     - made the ML compiler aware of various data-structure offsets so it
1451       can generate code for accessing the vp_inML flag and vp_limitPtrMask
1452     - tweaked mlriscGen.sml to have it emit interrupt-handling code for
1453       raw C-calls
1454    
1455    ----------------------------------------------------------------------
1456    Name: Lal George
1457    Date: 2001/04/20 09:15:28 EDT
1458    Tag: george-20010420-macosX
1459    Description:
1460    
1461     - Changes to port to Mac OS X; Darwin.
1462    
1463     - In the process I found that sqrt was broken on the PPC, because the
1464       fsqrt instruction is not implemented.
1465    
1466    ----------------------------------------------------------------------
1467    Name: Matthias Blume
1468    Date: 2001/04/18 12:45:00 EDT
1469    Tag: blume-20010418-ccalls
1470    Description:
1471    
1472     - fixed two off-by-4 errors in the x86-specific c-calls implementation
1473       (this bug prevented structure arguments containing pointers from being
1474        passed correctly)
1475     - changed the raw-C-call code in mlriscGen.sml in such a way that
1476       structure arguments are represented as a pointer to the beginning
1477       of the structure (instead of having a series of synthesized arguments,
1478       one for each structure member)
1479    
1480     - made makeml script's verbosity level configurable via environment
1481       variable (MAKEML_VERBOSITY)
1482    
1483     - eliminated placeholder implementations for f32l, w16s, i16s, and f32s
1484       in rawmem-x86.sml; we are now using the real thing
1485    
1486    ----------------------------------------------------------------------
1487    Name: Matthias Blume
1488    Date: 2001/03/22 16:25:00 EST
1489    Tag: blume-20010322-bootfiles
1490    Description:
1491    
1492    Created a new set of bootfiles (for your automatic installation convenience).
1493    
1494    ----------------------------------------------------------------------
1495    Name: Matthias Blume
1496    Date: 2001/03/22 15:10:00 EST
1497    Tag: blume-20010322-rawmem-parcm
1498    Description:
1499    
1500    1. All "raw memory access" primitives for the new FFI are implemented now
1501       (at least on the x86).
1502    2. Some further cleanup of CM's parallel make mechanism.
1503    
1504    ----------------------------------------------------------------------
1505    Name: Matthias Blume
1506    Date: 2001/03/19 17:53:00 EST
1507    Tag: blume-20010319-parallel
1508    Description:
1509    
1510    Parallel make (using compile servers) now works again.
1511    
1512    To this end, CM.stabilize and CMB.make have been modified to work in
1513    two passes when compile servers are attached:
1514       1. Compile everything, do not perform stabilization; this pass
1515          uses compile servers
1516       2. Stabilize everything; this pass does not use compile servers
1517    If there are no compile servers, the two passes are combined into one
1518    (as before).  Splitting the passes increases the inherent parallelism
1519    in the dependency graph because the entire graph including all
1520    libraries is available at the same time.  This, in turn, improves
1521    server utilization.  The downside is that the master process will
1522    have to do some extra work after compilation is done (because for
1523    technical reasons it must re-read all the binfiles during stabilization).
1524    
1525    ----------------------------------------------------------------------
1526    Name: Matthias Blume
1527    Date: 2001/03/16 12:22:00 EST
1528    Tag: blume-20010316-bootfiles
1529    Description:
1530    
1531    Created a new set of bootfiles (for your automatic installation convenience).
1532    
1533    ----------------------------------------------------------------------
1534    Name: Matthias Blume
1535    Date: 2001/03/16 11:00:00 EST
1536    Tag: blume-20010316-MLTREE-fixup
1537    Description:
1538    
1539    This is a minor fixup for an (untagged) earlier commit by Allen.
1540    (A file was missing).
1541    
1542    ----------------------------------------------------------------------
1543    Name: Allen Leung
1544    Date: Mon Mar  5 18:54:57 EST 2001
1545    Tag: leunga-20010305-cut-support
1546    
1547    1. New support for alternative control-flow in MLTREE.
1548       Currently we support
1549    
1550          FLOW_TO(CALL ...., [k1,...,kn])
1551    
1552       This is needed for 'cuts to' in C-- and try/handle-like constructs
1553       in Moby
1554    
1555       New assembler flag "asm-show-cutsto" to turn on control-flow debugging.
1556    
1557    2. Register Allocator
1558    
1559       Changes in interface [from Fermin, John]
1560    
1561    3. Alpha 8-bit SLL support [Fermin]
1562    
1563    4. All architectures
1564    
1565       A new module (ClusterExpandCopies) for expanding parallel copies.
1566    
1567    ----------------------------------------------------------------------
1568    Name: Allen Leung
1569    Date: 2001/02/27 23:07:00 EST
1570    Tag: leunga-20010227-minor-stuff
1571    
1572    1. Alpha bug fix for CMOVNE
1573    2. Handle mltree COND(..,FCMP ...,...)
1574    3. Bug fix in simplifier
1575    
1576    ----------------------------------------------------------------------
1577    Name: Matthias Blume
1578    Date: 2001/01/30 17:50:00 EST
1579    Tag: blume-20010130-sync
1580    Description:
1581    
1582    This is just a minor update to sync my devel branch with the main brach.
1583    The only visible change is the addition of some README files.
1584    
1585    ----------------------------------------------------------------------
1586    Name: Matthias Blume
1587    Date: 2001/01/12 23:30:00 JST
1588    Tag: blume-20010112-bootfiles
1589    Description:
1590    
1591    Made a new set of bootfiles that goes with the current state of the
1592    repository.
1593    
1594    ----------------------------------------------------------------------
1595    Name: Matthias Blume
1596    Date: 2001/01/12 21:20:00 JST
1597    Tag: blume-20010112-sync
1598    Description:
1599    
1600    I am just flushing out some minor changes that had accumulated in
1601    my private branch in order to sync with the main tree.  (This is
1602    mainly because I had CVS trouble when trying to merge _into_ my
1603    private branch.)
1604    
1605    Most people should be completely unaffected by this.
1606    
1607    ----------------------------------------------------------------------
1608    Name: Allen Leung
1609    Date: Thu Jan 11 21:03:00 EST 2001
1610    Tag: leunga-20010111-labexp=mltree
1611    Description:
1612    
1613    1.  Removed the type LabelExp and replace it by MLTree.
1614    2.  Rewritten mltree-simplify with the pattern matcher tool.
1615    3.  There were some bugs in alpha code generator which would break
1616        64-bit code generation.
1617    4.  Redo the tools to generate code with the
1618    5.  The CM files in MLRISC (and in src/system/smlnj/MLRISC)
1619        are now generated by perl scripts.
1620    
1621    ----------------------------------------------------------------------
1622    Name: Matthias Blume
1623    Date: 2001/01/10 21:55:00 JST
1624    Tag: blume-20010110-rcc
1625    Description:
1626    
1627    The RCC stuff now seems to work (but only on the x86).
1628    This required hacking of the c-calls interface (and -implementation) in
1629    MLRISC.
1630    
1631    Normal compiler users should be unaffected.
1632    
1633    ----------------------------------------------------------------------
1634    Name: Matthias Blume
1635    Date: 2001/01/09 01:20:00 JST
1636    Tag: blume-20010109-rcc
1637    Description:
1638    
1639    This is a fairly big patch, flushing out a large number of pending
1640    changes that I made to my development copy over the last couple of days.
1641    
1642    Of practical relevance at this moment is a workaround for a pickling
1643    bug that Allen ran into the other day.  The cause of the bug itself is
1644    still unknown and it might be hard to fix it properly, but the
1645    workaround has some merits of its own (namely somewhat reducing pickling
1646    overhead for certain libraries).  Therefore, I think this solution should
1647    be satisfactory at this time.
1648    
1649    The rest of the changes (i.e., the vast majority) has to do with my
1650    ongoing efforts of providing direct support for C function calls from
1651    ML.  At the moment there is a new primop "RAW_CCALL", typing magic
1652    in types/cproto.sml (invoked from FLINT/trans/translate.sml), a new
1653    case in the FLINT CPS datatype (RCC), changes to cps/convert.sml to
1654    translate uses of RAW_CCALL into RCC, and changes to mlriscGen.sml to
1655    handle RCC.
1656    
1657    The last part (the changes to mlriscGen.sml) are still known to be
1658    wrong on the x86 and not implemented on all other architectures.  But
1659    the infrastructure is in place. I had to change a few functor
1660    signatures in the backend to be able to route the CCalls interface
1661    from MLRISC there, and I had to specialize the mltree type (on the
1662    x86) to include the necessary extensions. (The extensions themselves
1663    were already there and redy to go in MLRISC/x86).
1664    
1665    Everything should be very happy as soon as someone helps me with
1666    mlriscGen.sml...
1667    
1668    In any case, nothing of this should matter to anyone as long as the
1669    new primop is not being used (which is going to be the case unless you
1670    find it where I hid it :). The rest of the compiler is completely
1671    unaffected.
1672    
1673    ----------------------------------------------------------------------
1674    Name: Matthias Blume
1675    Date: 2001/01/05 00:30:00 JST
1676    Tag: blume-20010105-primops
1677    Description:
1678    
1679    Added some experimental support for work that I am doing right now.
1680    These changes mostly concern added primops, but there is also a new
1681    experimental C library in the runtime system (but currently not enabled
1682    anywhere except on Linux/X86).
1683    
1684    In the course of adding primops (and playing with them), I discovered that
1685    Zhong's INL_PRIM hack (no type info for certain primops) was, in fact, badly
1686    broken.  (Zhong was very right he labeled this stuff as "major gross hack".)
1687    To recover, I made type information in INL_PRIM mandatory and changed
1688    prim.sml as well as built-in.sml accordingly.  The InLine structure now
1689    has complete, correct type information (i.e., no bottom types).
1690    
1691    Since all these changes mean that we need new binfiles, I also bumped the
1692    version number to 110.32.1.
1693    
1694    ----------------------------------------------------------------------
1695    Name: Matthias Blume
1696    Date: 2000/12/30 22:10:00 JST
1697    Tag: blume-20001230-various
1698    Description:
1699    
1700    Added proxy libraries for MLRISC and let MLRISC libraries refer
1701    to each other using path anchors.  (See CM manual for explanation.)
1702    
1703    Updated CM documentation.
1704    
1705    Fixed some bugs in CM.
1706    
1707    Implemented "proxy" libraries (= syntactic sugar for CM).
1708    
1709    Added "-quiet" option to makeml and changed runtime system accordingly.
1710    
1711    Added cleanup handler for exportML to reset timers and compiler stats.
1712    
1713    ----------------------------------------------------------------------
1714    Name: Lal George
1715    Date: 2000/12/22 22:22:58 EST 2000
1716    Tag: Release_110_32
1717    Description:
1718    
1719            Infinite precision used throughout MLRISC.
1720            see MLRISC/mltree/machine-int.sig
1721    
1722    ----------------------------------------------------------------------
1723    Name: Matthias Blume
1724    Date: 2000/12/22 23:16:00 JST
1725    Tag: blume-20001222-warn
1726    Description:
1727    
1728    Corrected wording and formatting of some CM warning message which I
1729    broke in my previous patch.
1730    
1731    ----------------------------------------------------------------------
1732    Name: Matthias Blume
1733    Date: 2000/12/22 21:20:00 JST
1734    Tag: blume-20001222-anchorenv
1735    Description:
1736    
1737    Fixed CM's handling of anchor environments in connection with CMB.make.
1738    
1739    ----------------------------------------------------------------------
1740    Name: Matthias Blume
1741    Date: 2000/12/22 13:15:00 JST
1742    Tag: blume-20001222-cleanup
1743    Description:
1744    
1745    Removed src/cm/ffi which does not (and did not) belong here.
1746    
1747    ----------------------------------------------------------------------
1748    Name: Matthias Blume
1749    Date: 2000/12/21 23:55:00 JST
1750    Tag: blume-20001221-exn
1751    Description:
1752    
1753    Probably most important: CM no longer silently swallows all exceptions
1754    in the compiler.
1755    Plus: some other minor CM changes.  For example, CM now reports some
1756    sizes for generated binfiles (code, data, envpickle, lambdapickle).
1757    
1758    ----------------------------------------------------------------------
1759    Name: Matthias Blume
1760    Date: 2000/12/15 00:01:05 JST
1761    Tag: blume-20001215-dirtool
1762    Description:
1763    
1764    - "dir" tool added.
1765    - improvements and cleanup to Tools structure
1766    - documentation updates
1767    
1768    ----------------------------------------------------------------------
1769    Name: Allen Leung
1770    Date: Thu Dec 14 03:45:24 EST 2000
1771    Description:
1772    Tag:  leunga-20001214-int-inf
1773    Description:
1774    
1775       In IntInf, added these standard functions, which are missing from our
1776    implementation:
1777    
1778        andb : int * int -> int
1779        xorb : int * int -> int
1780        orb  : int * int -> int
1781        notb : int -> int
1782         <<   : int * word -> int
1783        ~>>  : int * word -> int
1784    
1785       Not tested, I hope they are correct.
1786    
1787    ----------------------------------------------------------------------
1788    Name: Allen Leung
1789    Date: Fri Dec  8 19:23:26 EST 2000
1790    Description:
1791    Tag:  leunga-20001208-nowhere
1792    Description:
1793    
1794      Slight improvements to the 'nowhere' tool to handle OR-patterns,
1795    to generate better error messages etc.  Plus a brief manual.
1796    
1797    ----------------------------------------------------------------------
1798    Name: Lal George
1799    Date: 2000/12/08 09:54:02 EST 2000
1800    Tag: Release_110_31
1801    Description:
1802    
1803    - Version 110.31
1804    ----------------------------------------------------------------------
1805    Name: Allen Leung
1806    Date: Thu Dec  7 22:01:04 EST 2000
1807    Tag:  leunga-20001207-cell-monster-hack
1808    Description:
1809    
1810    Major MLRISC internal changes.  Affect all clients.
1811    Summary:
1812    
1813    1.  Type CELLS.cell = int is now replaced by a datatype.
1814        As a result, the old regmap is now gone.  Almost all interfaces
1815        in MLRISC change as a consequence.
1816    
1817    2.  A new brand version of machine description tool (v3.0) that generates
1818        modules expecting the new interface.  The old version is removed.
1819    
1820    3.  The RA interface has been further abstracted into two new functors.
1821        RISC_RA and X86RA.  These functors have much simpler interfaces.
1822        [See also directory MLRISC/demo.]
1823    
1824    4.  Some other new source->source code generation tools are available:
1825    
1826        a. MLRISC/Tools/RewriteGen -- generate rewriters from rules.
1827        b. MLRISC/Tools/WhereGen -- expands conditional pattern matching rules.
1828           I use this tool to generate the peephole optimizers---with the new
1829           cell type changes, peephole rules are becoming difficult to write
1830           without conditional pattern matching.
1831    
1832    5.  More Intmap -> IntHashTable change.  Previous changes by Matthias didn't
1833        cover the entire MLRISC source tree so many things broke.
1834    
1835    6.  CM files have been moved to the subdirectory MLRISC/cm.
1836        They are moved because there are a lot of them and they clutter up the
1837        root dir.
1838    
1839    7.  More detailed documentation to come...
1840    
1841        NOTE: To rebuild from 110.30 (ftp distribution), you'll have to do
1842        a makeml -rebuild first.  This is because of other other
1843        changes that Matthias has made (see below).
1844    
1845    
1846    ----------------------------------------------------------------------
1847    Name: Matthias Blume
1848    Date: 2000/11/30 23:12:00 JST
1849    Tag: blume-20001130-filereorg
1850    Description:
1851    
1852    Some manual updates and some file reorganizations in CM.
1853    
1854    ----------------------------------------------------------------------
1855    Name: Matthias Blume
1856    Date: 2000/11/24 17:45:00 JST
1857    Tag: blume-20001124-link
1858    Description:
1859    
1860    Drastically improved link traversal code for the case that the dynamic
1861    value was already loaded at bootstrap time.  As a result, CM and CMB
1862    now both load blazingly fast -- even on a very slow machine.  Also,
1863    memory consumption has been further reduced by this.
1864    
1865    Warning: The format of the PIDMAP file has changed.  THerefore, to
1866    bootstrap you have to do this:
1867    
1868    1. Run CMB.make
1869    2. Make a symbolic link for the boot directory:
1870         ln -s sml.boot.ARCH-OS xxx
1871    3. "Rebuild" the boot directory:
1872         ./makeml -boot xxx -rebuild sml ; rm xxx
1873    4. Boot normally:
1874          ./makeml
1875    
1876    ----------------------------------------------------------------------
1877    Name: Matthias Blume
1878    Date: 2000/11/21 21:20:00 JST
1879    Tag: blume-20001121-tools
1880    Description:
1881    
1882    Continued hacking on autoloading problem -- with success this time.
1883    Also changed tool-plugin mechanism.  See new CM manual.
1884    
1885    ----------------------------------------------------------------------
1886    Name: Matthias Blume
1887    Date: 2000/11/19 14:30:00 JST
1888    Tag:  blume-20001119-autoload
1889    Description:
1890    
1891    Some hacking to make autoloading faster.  Success for CMB, no success
1892    so far for CM.  There is a reduced structure CM' that autoloads faster.
1893    (This is a temporary, non-documented hack to be eliminated again when
1894    the general problem is solved.)
1895    
1896    ----------------------------------------------------------------------
1897    Name: Matthias Blume
1898    Date: 2000/11/17 14:10:00 JST
1899    Tag: blume-20001117-pickle-lib
1900    Description:
1901    
1902    1. Eliminated comp-lib.cm
1903    2. Made pickle-lib.cm
1904    3. Eliminated all uses of intset.sml (from comp-lib.cm)
1905    4. Replaced all uses of intmap.{sig,sml} (from comp-lib.cm) with
1906       equivalent constructs from smlnj-lib.cm (INtHashTable).
1907    5. Point 4. also goes for those uses of intmap.* in MLRISC.
1908       Duplicated intmap modules thrown out.
1909    6. Hunted down all duplicated SCC code and replaced it with
1910       equivalent stuff (GraphSCCFn from smlnj-lib.cm).
1911    7. Rewrote Feedback module.
1912    8. Moved sortedlist.sml into viscomp-lib.cm.  Eventually it
1913       should be thrown out and equivalent modules from smlnj-lib.cm
1914       should be used (IntRedBlackSet, IntListSet, ...).
1915    
1916    Confirmed that compiler compiles to fixpoint.
1917    
1918    ----------------------------------------------------------------------
1919    Name: Allen Leung
1920    Date: 2000/11/10 18:00:00
1921    Tag: leunga-20001110-new-x86-fp
1922    
1923    A new x86 floating point code generator has been added.
1924    By default this is turned off.  To turn this on, do:
1925    
1926        CM.autoload "$smlnj/compiler.cm";
1927        Compiler.Control.MLRISC.getFlag "x86-fast-fp" := true;
1928    
1929    Changes:
1930    
1931    1.  Changed FTAN to FPTAN so that the assembly output is correct.
1932    2.  Changed the extension callback for FTANGENT to generate:
1933    
1934              fptan
1935              fstp  %st(0)
1936        instead of
1937              fptan
1938              fstpl ftempmem
1939    
1940    3.  Numerous assembly fixes for x86.
1941    
1942    5.  Cleaned up the machine code output module x86/x86MC.sml and added
1943        support for a whole bunch of instructions and addressing modes:
1944    
1945          fadd/fsub/fsubr/fmul/fdiv/fdivr  %st, %st(n)
1946          faddp/fsubp/fsubrp/fmulp/fdivp/fdivrp  %st, %st(n)
1947          fadd/fsub/fsubr/fmul/fdiv/fdivr  %st(n), %st
1948          fiadd/fisub/fisubr/fimul/fidiv/fidivr mem
1949          fxch %st(n)
1950          fld %st(n)
1951          fst %st(n)
1952          fst mem
1953          fstp %st(n)
1954          fucom %st(n)
1955          fucomp %st(n)
1956    
1957        All these are now generated when the fast fp mode is turned on.
1958    
1959    6.  Removed the dedicated registers %st(0), ..., %st(7) from X86CpsRegs
1960    
1961    ----------------------------------------------------------------------
1962    Name: Matthias Blume
1963    Date: 2000/11/09 11:20:00 JST
1964    Tag: blume-20001109-scc
1965    Description:
1966    
1967    Eliminated some code duplication:
1968    
1969    1. Added "where" clause to GraphSCCFn in SML/NJ Library.
1970       (Otherwise the functor is useless.)
1971    2. Used GraphSCCFn where SCCUtilFun was used previously.
1972    3. Got rid of SCCUtilFun (in comp-lib.cm).
1973    
1974    ----------------------------------------------------------------------
1975    Name: Lal George
1976    Date: 2000/11/06 09:02:21 EST 2000
1977    Tag: Release_110_30
1978    Description:
1979    
1980    - Version 110.30
1981    ----------------------------------------------------------------------
1982    Name: Matthias Blume
1983    Date: 2000/11/04 14:45:00
1984    Tag: blume-20001104-mlbuild
1985    Description:
1986    
1987    - Made ml-build faster on startup.
1988    - Documentation fixes.
1989    
1990    ----------------------------------------------------------------------
1991    Name: Matthias Blume
1992    Date: 2000/11/02 17:00:00 JST
1993    Tag: blume-20001102-condcomp
1994    Description:
1995    
1996    - Small tweaks to pickler -- new BOOTFILES!
1997    - Version bumped to 110.29.2.
1998    - Added conditional compilation facility to init.cmi (see comment there).
1999    ----------------------------------------------------------------------
2000    Name: Allen Leung
2001    Date: 2000/10/23 19:31:00
2002    Tag: leunga-20001023-demo-ra
2003    
2004    1. Minor RA changes that improves spilling on x86 (affects Moby and C-- only)
2005    2. Test programs for the graph library updated
2006    3. Some new MLRISC demo programs added
2007    
2008    ----------------------------------------------------------------------
2009    Name: Matthias Blume
2010    Date: 2000/08/31 22:15:00 JST
2011    Tag: blume-20001017-errmsg
2012    Description:
2013    
2014    More error message grief: Where there used to be no messages, there
2015    now were some that had bogus error regions.  Fixed.
2016    
2017    ----------------------------------------------------------------------
2018    Name: Matthias Blume
2019    Date: 2000/08/31 17:30:00 JST
2020    Tag: blume-20001017-v110p29p1
2021    Description:
2022    
2023    I made a version 110.29.1 with new bootfiles.
2024    
2025    Changes:  Modified pickler/unpickler for faster and leaner unpickling.
2026              CM documentation changes and a small bugfix in CM's error reporting.
2027    
2028    ----------------------------------------------------------------------
2029    Name: Lal George
2030    Date: 2000/09/27 14:42:35 EDT
2031    Tag: george-20000927-nodestatus
2032    Description:
2033    
2034    Changed the type of the nodestatus, so that:
2035    
2036            SPILLED(~1)             is now SPILLED
2037            SPILLED(m) where m>=0   is now MEMREG(m)
2038            SPILLED(s) where s<~1   is now SPILL_LOC(~s)
2039    
2040    ----------------------------------------------------------------------
2041    Name: Matthias Blume
2042    Date: 2000/09/07 14:45:00 JST
2043    Tag: blume-20000907-cmerrmsg
2044    Description:
2045    
2046    Small tweak to CM to avoid getting ML syntax error messages twice.
2047    
2048    ----------------------------------------------------------------------
2049    Name: Matthias Blume
2050    Date: 2000/08/31 18:00:00 JST
2051    Tag: blume-20000831-cvsbootfiles
2052    Description:
2053    
2054    New URL for boot files (because the 110.29 files on the BL server do
2055    now work correctly with my updated install scripts for yacc and lex).
2056    
2057    ----------------------------------------------------------------------
2058    Name: Matthias Blume
2059    Date: 2000/08/08 12:33:00 JST
2060    Tag: blume-20000808-manual
2061    Description:
2062    
2063    Tiny update to CM manual.
2064    
2065    ----------------------------------------------------------------------
2066    Name: Allen Leung
2067    Date: 2000/08/7 19:31:00
2068    Tag: leunga-20000807-a-whole-bunch-of-stuff
2069    
2070      Moby, C--, SSA, x86, machine descriptions etc.  Should only affect C--
2071    and Mobdy.
2072    
2073    1.  x86
2074    
2075       a.  Fixes to peephole module by John and Dan.
2076       b.  Assembly fix to SETcc by Allen.
2077       c.  Fix to c-call by John.
2078       d.  Fix to spilling by John.  (This one deals with the missing FSTPT case)
2079       e.  Instruction selection optimization to SETcc as suggested by John.
2080    
2081           For example,
2082    
2083            MV(32, x, COND(32, CMP(32, LT, a, b), LI 1, LI 0))
2084    
2085           should generate:
2086    
2087            MOVL a, x
2088            SUBL b, x
2089            SHRL 31, x
2090    
2091    2.  IR stuff
2092    
2093         A bunch of new DJ-graph related algorithms added.  These
2094         speed up SSA construction.
2095    
2096    3.  SSA + Scheduling
2097    
2098         Added code for SSA and scheduling to the repository
2099    
2100    ----------------------------------------------------------------------
2101    Name: Lal George
2102    Date: 2000/07/27 11:53:14 EDT
2103    
2104    Tag: lal-20000727-linux-ppc
2105    Description:
2106    
2107     Made changes to support Linux PPC.
2108     p.s. I have confirmation that the 110.29 boot files work fine.
2109    
2110    ----------------------------------------------------------------------
2111    Name: Matthias Blume
2112    Date: 2000/07/27 17:40:00 JST
2113    Tag: blume-20000727-scripts
2114    Description:
2115    
2116    !!!! WARNING !!!!
2117    You must recompile the runtime system!
2118    !!!! WARNING !!!!
2119    
2120    This is basically another round of script-enhancements:
2121    
2122    1. sml, ml-build, and ml-makedepend accept options -D and -U to define
2123       and undefine CM preprocessor symbols.
2124    
2125    2. ml-build avoids generating a new heap image if it finds that the
2126       existing one is still ok.  (The condition is that no ML file had to
2127       be recompiled and all ML files are found to be older that the heap
2128       file.)
2129    
2130       To make this work smoothly, I also hacked the runtime system as
2131       well as SMLofNJ.SysInfo to get access to the heap image suffix
2132       (.sparc-solaris, ...) that is currently being used.
2133    
2134       Moreover, the signature of CM.mk_standalone has changed.  See the
2135       CM manual.
2136    
2137    3. ml-makedepend accepts additional options -n, -a, and -o.  (See the
2138       CM manual for details.)
2139    
2140    4. More CM manual updates:
2141        - all of the above has been documented.
2142        - there is now a section describing the (CM-related) command line
2143          arguments that are accepted by the "sml" command
2144    
2145    ----------------------------------------------------------------------
2146    Name: Matthias Blume
2147    Date: 2000/07/25 16:20:00 JST
2148    Tag: blume-20000725-makedepend
2149    Description:
2150    
2151    Added a script called ml-makedepend.  This can be used in makefiles
2152    for Unix' make in a way very similar to the "makedepend" command for
2153    C.
2154    
2155    The script internally uses function CM.sources.
2156    
2157    Synopsis:
2158    
2159        ml-makedepend [-f makefile] cmfile targetname
2160    
2161    The default for the makefile is "makefile" (or "Makefile" should
2162    "makefile" not exist).
2163    
2164    ml-makedepend adds a cmfile/targetname-specific section to this
2165    makefile (after removing the previous version of this section).  The
2166    section contains a single dependency specification with targetname on
2167    the LHS (targetname is an arbitrary name), and a list of files derived
2168    from the cmfile on the RHS.  Some of the files on the RHS are
2169    ARCH/OPSYS-specific.  Therefore, ml-makedepend inserts references to
2170    "make" variables $(ARCH) and $(OPSYS) in place of the corresponding
2171    path names.  The makefile writer is responsible for making sure that
2172    these variables have correct at the time "make" is invoked.
2173    
2174    ----------------------------------------------------------------------
2175    Name: Matthias Blume
2176    Date: 2000/07/22 23:30:00 JST
2177    Tag: blume-20000722-urlupdate
2178    Description:
2179    
2180    Changed BOOT and config/srcarchiveurl to point to BL server:
2181    
2182        ftp://ftp.research.bell-labs.com/dist/smlnj/working/110.29/
2183    
2184    ----------------------------------------------------------------------
2185    Name: Matthias Blume
2186    Date: 2000/07/18 18:00:00 JST
2187    Tag: blume-20000718-Version_110_29
2188    Description:
2189    
2190    1. Updated src/compiler/TopLevel/main/version.sml to version 110.29
2191    
2192    2. Updated config/version to 110.29
2193    
2194    3. Updated config/srcarchiveurl
2195    
2196    3. New boot files!
2197       ftp://ftp.cs.princeton.edu/pub/people/blume/sml/110.29-autofetch
2198    
2199    ----------------------------------------------------------------------
2200    Name: Matthias Blume
2201    Date: 2000/07/11 13:58:00 JST
2202    Tag: blume-20000711-doctypo
2203    Description:
2204    
2205    Fixed a few typos in CM manual.
2206    
2207    ----------------------------------------------------------------------
2208    Name: Allen Leung
2209    Date: 2000/06/15 00:38:00
2210    Tag: leunga-20000704-sparc-x86
2211    
2212    1. x86 peephole improvement sp += k; sp -= k => nop  [from John]
2213    2. fix to x86 RET bug [found by Dan Grossman]
2214    3. sparc assembly bug fix for ticc instructions [found by Fermin]
2215    
2216       Affects c-- and moby only
2217    
2218    ----------------------------------------------------------------------
2219    Name: Matthias Blume
2220    Date: 2000/07/04 15:26:00
2221    Tag: blume-20000704-trigger
2222    Description:
2223    
2224    1. Improvements to CM manual.
2225    2. SMLofNJ.Internals.BTrace.trigger reinstated as an alternative way
2226       of getting a back-trace.  The function, when called, raises an
2227       internal exception which explicitly carries the full back-trace history,
2228       so it is unaffected by any intervening handle-raise pairs ("trivial"
2229       or not).  The interactive loop will print that history once it arrives
2230       at top level.
2231       Short of having all exceptions implicitly carry the full history, the
2232       recommended way of using this facility is:
2233         - compile your program with instrumentation "on"
2234         - run it, when it raises an exception, look at the history
2235         - if the history is "cut off" because of some handler, go and modify
2236           your program so that it explicitly calls BTrace.trigger
2237         - recompile (still instrumented), and rerun; look at the full history
2238    
2239    ----------------------------------------------------------------------
2240    Name: Matthias Blume
2241    Date: 2000/07/03 15:36:00 JST
2242    Tag: blume-20000702-manual
2243    Description:
2244    
2245    Small corrections and updates to CM manual.
2246    
2247    ----------------------------------------------------------------------
2248    Name: Matthias Blume
2249    Date: 2000/06/29 16:04:00 JST
2250    Tag: blume-20000629-yacctool
2251    Description:
2252    
2253    Changes:
2254    
2255    1. Class "mlyacc" now takes separate arguments to pass options to
2256       generated .sml- and .sig-files independently.
2257    2. Corresponding CM manual updates.
2258    3. BTrace module now also reports call sites.  (However, for loop clusters
2259       it only shows from where the cluster was entered.)  There are associated
2260       modifications to core.sml, internals.{sig,sml}, btrace.sml, and btimp.sml.
2261    
2262    ----------------------------------------------------------------------
2263    Name: Matthias Blume
2264    Date: 2000/06/27 16:51:00 JST
2265    Tag: blume-20000627-noweb
2266    Description:
2267    
2268    Changes:
2269    
2270     1. Implemented "subdir" and "witness" options for noweb tool.
2271        This caused some slight internal changes in CM's tool implementation.
2272     2. Fixed bug in "tool plugin" mechanism.  This is essentially cleaning
2273        some remaining issues from earlier path anchor changes.
2274     3. Updated CM manual accordingly.
2275    
2276     4. Changed implementation of back-tracing so that I now consider it
2277        ready for prime-time.
2278    
2279        In particular, you don't have to explicitly trigger the back-trace
2280        anymore.  Instead, if you are running BTrace-instrumented code and
2281        there is an uncaught exception (regardless of whether or not it was
2282        raised in instrumented code), the top-level evalloop will print
2283        the back-trace.
2284    
2285        Features:
2286    
2287          - Instrumented and uninstrumented code work together seemlessly.
2288            (Of course, uninstrumented code is never mentioned in actual
2289             back-traces.)
2290    
2291          - Asymptotic time- and space-complexity of instrumented code is
2292            equal to that of uninstrumented code.  (This means that
2293            tail-recursion is preserved by the instrumentation phase.)
2294    
2295          - Modules whose code has been instrumented in different sessions
2296            work together without problem.
2297    
2298          - There is no penalty whatsoever on uninstrumented code.
2299    
2300          - There is no penalty on "raise" expressions, even in
2301            instrumented code.
2302    
2303        A potential bug (or perhaps it is a feature, too):
2304    
2305          A back-trace reaches no further than the outermost instrumented
2306          non-trivial "raise".  Here, a "trivial" raise is one that is the
2307          sole RHS of a "handle" rule.  Thus, back-traces reach trough
2308    
2309               <exp> handle e => raise e
2310    
2311          and even
2312    
2313               <exp> handle Foo => raise Bar
2314    
2315          and, of course, through
2316    
2317               <exp> handle Foo => ...
2318    
2319         if the exception was not Foo.
2320    
2321         Back-traces always reach right through any un-instrumented code
2322         including any of its "handle" expressions, trivial or not.
2323    
2324       To try this out, do the following:
2325    
2326         - Erase all existing binfiles for your program.
2327           (You may keep binfiles for those modules where you think you
2328            definitely don't need back-tracing.)
2329         - Turn on back-trace instrumentation:
2330              SMLofNJ.Internals.BTrace.mode (SOME true);
2331         - Recompile your program.  (I.e., run "CM.make" or "use".)
2332         - You may now turn instrumentation off again (if you want):
2333              SMLofNJ.Internals.BTrace.mode (SOME false);
2334         - Run your program as usual.  If it raises an exception that
2335           reaches the interactive toplevel, then a back-trace will
2336           automatically be printed.  After that, the toplevel loop
2337           will print the exception history as usual.
2338    
2339    ----------------------------------------------------------------------
2340    Name: Matthias Blume
2341    Date: 2000/06/26 09:56:46 JST
2342    Tag: blume-20000626-setup
2343    Description:
2344    
2345    CM: - setup-parameter to "sml" added; this can be used to run arbitrary
2346          ML code before and after compiling a file (e.g., to set compiler
2347          flags)
2348    
2349    Compiler: - improved btrace API (in core.sml, internals.{sig,sml})
2350              - associated changes to btrace.sml (BTrace instrumentation pass)
2351              - cleaner implementation of btimp.sml (BTrace tracing and report
2352                module)
2353    
2354    CM manual: * new path encoding documented
2355               * description of setup-parameter to "sml" added
2356    
2357    The biggest user-visible change to back-tracing is that it is no
2358    longer necessary to compile all traced modules within the same
2359    session.  (This was a real limitation.)
2360    
2361    ----------------------------------------------------------------------
2362    Name: Matthias Blume
2363    Date: 2000/06/24 12:40:00 JST
2364    Tag: blume-20000624-startup
2365    Description:
2366    
2367    Fixes startup slowdown problem.  (I was calling SrcPath.sync a _tad_
2368    bit too often -- to put it mildly. :)
2369    
2370    ----------------------------------------------------------------------
2371    Name: Matthias Blume
2372    Date: 2000/06/23 18:20:00 JST
2373    Tag: blume-20000623-btrace
2374    Description:
2375    
2376    This updates adds a backtrace facility to aid programmers in debugging
2377    their programs.  This involves the following changes:
2378    
2379    1. Module system/smlnj/init/core.sml (structure _Core) now has hooks for
2380       keeping track of the current call stack.  When programs are compiled
2381       in a special mode, the compiler will insert calls to these hooks
2382       into the user program.
2383       "Hook" means that it is possible for different implementations of
2384       back-tracing to register themselves (at different times).
2385    
2386    2. compiler/MiscUtil/profile/btrace.sml implements the annotation phase
2387       as an Absyn.dec->Absyn.dec rewrite.  Normally this phase is turned off.
2388       It can be turned on using this call:
2389         SMLofNJ.Internals.BTrace.mode (SOME true);
2390       Turning it off again:
2391         SMLofNJ.Internals.BTrace.mode (SOME false);
2392       Querying the current status:
2393         SMLofNJ.Internals.BTrace.mode NONE;
2394       Annotated programs are about twice as big as normal ones, and they
2395       run a factor of 2 to 4 slower with a dummy back-trace plugin (one
2396       where all hooks do nothing).  The slowdown with a plugin that is
2397       actually useful (such as the one supplied by default) is even greater,
2398       but in the case of the default plugin it is still only an constant
2399       factor (amortized).
2400    
2401    3. system/Basis/Implementation/NJ/internals.{sig,sml} have been augmented
2402       with a sub-structure BTrace for controlling back-tracing.  In particular,
2403       the above-mentioned function "mode" controls whether the annotation
2404       phase is invoked by the compiler.  Another important function is
2405       "trigger": when called it aborts the current execution and causes
2406       the top-level loop to print a full back-trace.
2407    
2408    4. compiler/MiscUtil/profile/btimp.sml is the current default plugin
2409       for back-tracing.  It keeps track of the dynamic call stack and in
2410       addition to that it keeps a partial history at each "level" of that
2411       stack.  For example, if a tail-calls b, b tail-calls c, and c tail-calls
2412       d and b (at separate times, dynamically), then the report will show:
2413    
2414       GOTO   d
2415             /c
2416       GOTO  \b
2417       CALL   a
2418    
2419       This shows that there was an initial non-tail call of a, then a
2420       tail-call to b or c, looping behavior in a cluster of functions that
2421       consist of b and c, and then a goto from that cluster (i.e., either from
2422       b or from c) to d.
2423    
2424       Note that (depending on the user program) the amount of information
2425       that the back-trace module has to keep track of at each level is bounded
2426       by a constant.  Thus, the whole implementation has the same asymptotical
2427       complexity as the original program (both in space and in time).
2428    
2429    5. compiler/TopLevel/interact/evalloop.sml has been modified to
2430       handle the special exception SMLofNJ.Internals.BTrace.BTrace
2431       which is raised by the "trigger" function mentioned above.
2432    
2433    Notes on usage:
2434    
2435    - Annotated code works well together with unannotated code:
2436    Unannotated calls simply do not show up at all in the backtrace.
2437    
2438    - It is not a good idea to let modules that were annotated during
2439    different sessions run at the same time.  This is because the compiler
2440    chooses small integers to identify individual functions, and there
2441    will be clashes if different modules were compiled in separate sessions.
2442    (Nothing will crash, and you will even be told about the clashes, but
2443    back-trace information will in general not be useful.)
2444    
2445    - Back-tracing can be confused by callcc and capture.
2446    
2447    - The only way of getting a back-trace right now is to explicitly
2448    invoke the "trigger" function from your user program.  Eventually, we
2449    should make every exception carry back-trace information (if
2450    available).  But since this creates more overhead at "raise"-time
2451    (similar to the current exnHistory overhead), I have not yet
2452    implemented this.  (The implementation will be rather easy.)  With
2453    exceptions carrying back-trace information, this facility will be even
2454    more useful because users don't need to modify their programs...
2455    
2456    - While it is possible to compile the compiler with back-trace
2457    annotations turned on (I did it to get some confidence in
2458    correctness), you must make absolutely sure that core.sml and
2459    btimp.sml are compiled WITHOUT annotation!  (core.sml cannot actually
2460    be compiled with annotation because there is no core access yet, but
2461    if you compile btimp.sml with annotation, then the system will go into
2462    an infinite recursion and crash.)
2463    Since CM currently does not know about BTrace, the only way to turn
2464    annotations on and off for different modules of the compiler is to
2465    interrupt CMB.make, change the settings, and re-invoke it.  Of course,
2466    this is awkward and clumsy.
2467    
2468    Sample sessions:
2469    
2470    Standard ML of New Jersey v110.28.1 [FLINT v1.5], June 5, 2000
2471    - SMLofNJ.Internals.BTrace.mode (SOME true);
2472    [autoloading]
2473    [autoloading done]
2474    val it = false : bool
2475    - structure X = struct
2476    -     fun main n = let
2477    -         fun a (x, 0) = d x
2478    -           | a (x, n) = b (x, n - 1)
2479    -         and b (x, n) = c (x, n)
2480    -         and c (x, n) = a (x, n)
2481    -         and d x = e (x, 3)
2482    -         and e (x, 0) = f x
2483    -           | e (x, n) = e (x, n - 1)
2484    -         and f 0 = SMLofNJ.Internals.BTrace.trigger ()
2485    -           | f n = n * g (n - 1)
2486    -         and g n = a (n, 3)
2487    -     in
2488    -         f n
2489    -     end
2490    - end;
2491    structure X : sig val main : int -> int end
2492    - X.main 3;
2493    *** BACK-TRACE ***
2494    GOTO   stdIn:4.2-13.20: X.main[2].f
2495    GOTO-( stdIn:4.2-13.20: X.main[2].e
2496    GOTO   stdIn:4.2-13.20: X.main[2].d
2497         / stdIn:4.2-13.20: X.main[2].a
2498         | stdIn:4.2-13.20: X.main[2].b
2499    GOTO-\ stdIn:4.2-13.20: X.main[2].c
2500    CALL   stdIn:4.2-13.20: X.main[2].g
2501    GOTO   stdIn:4.2-13.20: X.main[2].f
2502    GOTO-( stdIn:4.2-13.20: X.main[2].e
2503    GOTO   stdIn:4.2-13.20: X.main[2].d
2504         / stdIn:4.2-13.20: X.main[2].a
2505         | stdIn:4.2-13.20: X.main[2].b
2506    GOTO-\ stdIn:4.2-13.20: X.main[2].c
2507    CALL   stdIn:4.2-13.20: X.main[2].g
2508    GOTO   stdIn:4.2-13.20: X.main[2].f
2509    GOTO-( stdIn:4.2-13.20: X.main[2].e
2510    GOTO   stdIn:4.2-13.20: X.main[2].d
2511         / stdIn:4.2-13.20: X.main[2].a
2512         | stdIn:4.2-13.20: X.main[2].b
2513    GOTO-\ stdIn:4.2-13.20: X.main[2].c
2514    CALL   stdIn:4.2-13.20: X.main[2].g
2515    GOTO   stdIn:4.2-13.20: X.main[2].f
2516    CALL   stdIn:2.15-17.4: X.main[2]
2517    -
2518    
2519    (Note that because of a FLINt bug the above code currently does not
2520    compile without BTrace turned on.)
2521    
2522    Here is another example, using my modified Tiger compiler:
2523    
2524    Standard ML of New Jersey v110.28.1 [FLINT v1.5], June 5, 2000
2525    - SMLofNJ.Internals.BTrace.mode (SOME true);
2526    [autoloading]
2527    [autoloading done]
2528    val it = false : bool
2529    - CM.make "sources.cm";
2530    [autoloading]
2531    ...
2532    [autoloading done]
2533    [scanning sources.cm]
2534    [parsing (sources.cm):parse.sml]
2535    [creating directory CM/SKEL ...]
2536    [parsing (sources.cm):tiger.lex.sml]
2537    ...
2538    [wrote CM/sparc-unix/semant.sml]
2539    [compiling (sources.cm):main.sml]
2540    [wrote CM/sparc-unix/main.sml]
2541    [New bindings added.]
2542    val it = true : bool
2543    - Main.compile ("../testcases/merge.tig", "foo.out");
2544    *** BACK-TRACE ***
2545    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trvar
2546    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
2547    CALL   lib/semant.sml:289.3-295.22: SemantFun[2].transExp.trexp.check[2]
2548    GOTO   lib/semant.sml:289.3-295.22: SemantFun[2].transExp.trexp.check[2]
2549    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
2550    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
2551    CALL   lib/semant.sml:488.3-505.6: SemantFun[2].transDec.trdec[2].transBody[2]
2552         / lib/semant.sml:411.65-543.8: SemantFun[2].transDec
2553    CALL-\ lib/semant.sml:413.2-540.9: SemantFun[2].transDec.trdec[2]
2554    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
2555    CALL   lib/semant.sml:8.52-558.4: SemantFun[2].transProg[2]
2556    CALL   main.sml:1.18-118.4: Main.compile[2]
2557    -
2558    
2559    ----------------------------------------------------------------------
2560    Name: Matthias Blumen
2561    Date: 2000/06/21 18:00:00 JST
2562    Tag: blume-20000621-manual
2563    Description:
2564    
2565    CM manual update: Path environments documented.
2566    
2567    ----------------------------------------------------------------------
2568    Name: Matthias Blume
2569    Date: 2000/06/19 13:40:00
2570    Tag: blume-20000619-manual
2571    Description:
2572    
2573    CM manual and system/README update.  This only covers the fact that
2574    there are no more implicit anchors.  (Path environments and the "bind"
2575    option to "cm" have yet to be documented.)
2576    
2577    ----------------------------------------------------------------------
2578    Name: Matthias Blume
2579    Date: 2000/06/19 11:05:00 JST
2580    Tag: blume-20000619-chdir-bugfix
2581    Description:
2582    
2583    Fixed a bug in new SrcPath module that sometimes led to a bad chDir call.
2584    
2585    ----------------------------------------------------------------------
2586    Name: Matthias Blume
2587    Date: 2000/06/18 22:00:10 JST
2588    Tag: blume-20000618-implicit-anchors-really-gone
2589    Description:
2590    
2591    I updates the previous HISTORY entry where I forgot to mention that
2592    implicit anchors are no longer with us.
2593    
2594    The current update also gets rid of the (now useless) controller
2595    CM.Control.implicit_anchors.
2596    
2597    ----------------------------------------------------------------------
2598    Name: Matthias Blume
2599    Date: 2000/06/16 17:30:00 JST
2600    Tag: blume-20000616-anchorenv
2601    Description:
2602    
2603    This patch implements the long anticipated (just kidding :) "anchor
2604    environment" mechanism.  In the course of doing this, I also
2605    re-implemented CM's internal "SrcPath" module from scratch.  The new
2606    one should be more robust in certain boundary cases.  In any case, it
2607    is a lot cleaner than its predecessor (IMHO).
2608    
2609    This time, although there is yet another boot file format change, I
2610    kept the unpickler backward-compatible.  As a result, no new bootfiles
2611    are necessary and bootstrapping is straightforward.  (You cannot read
2612    new bootfiles into an old system, but the other way around is no
2613    problem.)
2614    
2615    Visible changes:
2616    
2617    ** 0. Implicit path anchors (without the leading $-symbol) are no
2618    longer recognized at all. This means that such path names are not
2619    illegal either.  For example, the name basis.cm simply refers to a
2620    local file called "basis.cm" (i.e, the name is an ordinary path
2621    relative to .cm-files directory).  Or, to put it differently, only
2622    names that start with $ are anchored paths.
2623    
2624    ** 1. The $<singlearc> abbreviation for $/<singlearc> has finally
2625    vanished.
2626    
2627    John (Reppy) had critizised this as soon as I originally proposed and
2628    implemented it, but at that time I did not really deeply believe
2629    him. :) Now I came full-circle because I need the $<singlearc> syntax
2630    in another place where it cannot be seen as an abbreviation for
2631    $/<singlearc>.  To avoid the confusion, $<singlearc> now means what it
2632    seems to mean (i.e., it "expands" into the corresponding anchor
2633    value).
2634    
2635    However, when paths are used as members in CM description files, it
2636    continues to be true that there must be at least another arc after the
2637    anchor.  This is now enforced separately during semantic analysis
2638    (i.e., from a lexical/syntactical point of view, the notation is ok.)
2639    
2640    ** 2. The "cm" class now accepts an option "bind".  The option's value
2641    is a sub-option list of precisely two items -- one labeled "anchor"
2642    and the other one labeled "value".  As you might expect, "anchor" is
2643    used to specify an anchor name to be bound, and "value" specifies what
2644    the anchor is being bound to.
2645    
2646    The value must be a directory name and can be given in either standard
2647    syntax (including the possibility that it is itself an anchored path)
2648    or native syntax.
2649    
2650    Examples:
2651    
2652       foo.cm (bind:(anchor:bar value:$mystuff/bar))
2653       lib.cm (bind:(anchor:a value:"H:\\x\\y\\z"))  (* only works under windows *)
2654    
2655    and so on.
2656    
2657    The meaning of this is that the .cm-file will be processed with an
2658    augmented anchor environment where the given anchor(s) is/are bound to
2659    the given values(s).
2660    
2661    The rationale for having this feature is this: Suppose you are trying
2662    to use two different (already stable) libraries a.cm and b.cm (that
2663    you perhaps didn't write yourself).  Further, suppose each of these
2664    two libraries internally uses its own auxiliary library $aux/lib.cm.
2665    Normally you would now have a problem because the anchor "lib" can not
2666    be bound to more than one value globally.  Therefore, the project that
2667    uses both a.cm and b.cm must locally redirect the anchor to some other
2668    place:
2669    
2670       a.cm (bind:(anchor:lib value:/usr/lib/smlnj/a-stuff))
2671       b.cm (bind:(anchor:lib value:/usr/lib/smlnj/b-stuff))
2672    
2673    This hard-wires $lib/aux.cm to /usr/lib/smlnj/a-stuff/aux.cm or
2674    /usr/lib/smlnj/b-stuff/aux.cm, respectively.
2675    
2676    Hard-wiring path names is a bit inflexible (and CM will verbosely warn
2677    you when you do so at the time of CM.stabilize).  Therefore, you can
2678    also use an anchored path as the value:
2679    
2680      a.cm (bind:(anchor:lib value:$a-lib))
2681      b.cm (bind:(anchor:lib value:$b-lib))
2682    
2683    Now you can globally configure (using the usual CM.Anchor.anchor or
2684    pathconfig machinery) bindings for "a-lib" and "b-lib".  Since "lib"
2685    itself is always locally bound, setting it globally is no longer
2686    meaningful or necessary (but it does not hurt either).  In fact, "lib"
2687    can still be used as a global anchor for separate purposes.  As a
2688    matter of fact, one can locally define "lib" in terms of a global
2689    "lib":
2690    
2691      a.cm (bind:(anchor:lib value:$lib/a))
2692      b.cm (bind:(anchor:lib value:$lib/b))
2693    
2694    ** 3: The encoding of path names has changed.  This affects the way
2695    path names are shown in CM's progress report and also the internal
2696    protocol encoding used for parallel make.
2697    
2698    The encoding now uses one or more ':'-separated segments.  Each
2699    segments corresponds to a file that has been specified relative to the
2700    file given by its preceding segment.  The first segment is either
2701    relative to the CWD, absolute, or anchored.  Each segment itself is
2702    basically a Unix pathname; all segments but the first are relative.
2703    
2704    Example:
2705    
2706       $foo/bar/baz.cm:a/b/c.sml
2707    
2708    This path denotes the file bar/a/b/c.sml relative to the directory
2709    denoted by anchor "foo".  Notice that the encoding also includes
2710    baz.cm which is the .cm-file that listed a/b/c.sml.  As usual, such
2711    paths are resolved relative to the .cm-files directory, so baz.cm must
2712    be ignored to get the "real" pathname.
2713    
2714    To make this fact more obvious, CM puts the names of such "virtual
2715    arcs" into parentheses when they appear in progress reports. (No
2716    parentheses will appear in the internal protocol encoding.)  Thus,
2717    what you really see is:
2718    
2719      $foo/bar/(baz.cm):a/b/c.sml
2720    
2721    I find this notation to be much more informative than before.
2722    
2723    Another new feature of the encoding is that special characters
2724    including parentheses, colons, (back)slashes, and white space are
2725    written as \ddd (where ddd is the decimal encoding of the character).
2726    
2727    *** The CM manual still needs to be updated.
2728    
2729    ----------------------------------------------------------------------
2730    Name: Allen Leung
2731    Date: 2000/06/15 00:38:00
2732    Tag: leunga-20000615-x86-peephole
2733    
2734    x86 Peephole fix by Fermin.  Affects c-- and moby only.
2735    
2736    ----------------------------------------------------------------------
2737    Name: Matthias Blume
2738    Date: 2000/06/12 11:40:00
2739    Tag: blume-20000612-parmakefix
2740    Description:
2741    
2742    More cleanup after changing the file naming scheme: This time I
2743    repaired the parallel make mechanism for CMB.make which I broke earlier.
2744    
2745    ----------------------------------------------------------------------
2746    Name: Allen Leung
2747    Date: 2000/06/09 01:25:00
2748    Tag: leunga-20000609-various
2749    
2750    None of these things should affect normal SML/NJ operations
2751    
2752    1. Peephole improvements provided by Fermin (c--)
2753    2. New annotation DEFUSE for adding extra dependence (moby)
2754    3. New X86 LOCK instructions (moby)
2755    4. New machine description language for reservation tables (scheduling)
2756    5. Fixes to various optimization/analysis modules (branch chaining, dominator
2757       trees etc.)
2758    6. I've changed the CM files so that they can work with versions
2759       110.0.6, 110.25 and 110.28
2760    
2761    ----------------------------------------------------------------------
2762    Name: Matthias Blume
2763    Date: 2000/06/09 12:40:00
2764    Tag: blume-20000609-log
2765    Description:
2766    
2767    - Removed all(?) remaining RCS Log entries from sources.
2768    
2769    - Fixed bug in ml-yacc and ml-lex sources (use explicit anchors for
2770      anchored paths).
2771    
2772    ----------------------------------------------------------------------
2773    Name: Matthias Blume
2774    Date: 2000/06/07 17:00:00 JST
2775    Tag: blume-20000607-no-implicit-anchors
2776    Description:
2777    
2778    1. This update changes the default setting for
2779    CM.Control.implicit_anchors from true to false.  This means that
2780    implicit anchors are no longer permitted by default.  I also tried to
2781    make sure that nothing else still relies on implicit anchors.
2782    (This is the next step on the schedule towards a CM that does not even
2783    have the notion of implicit anchors anymore.)
2784    
2785    2. More CM manual updates.
2786    
2787    3. I managed to track down and fix the pickling bug I mentioned last
2788    time.  Because of the previously existing workaround, this entails no
2789    immediate practical changes.
2790    
2791    ----------------------------------------------------------------------
2792    Name: Matthias Blume
2793    Date: 2000/06/06 11:15:00 JST
2794    Tag: blume-20000606-lazierpickle
2795    Description:
2796    
2797    !!!! NEW BOOT FILES !!!!
2798    
2799    * The main purpose of this update is to make library pickles lazier in
2800    order to reduce the initial space penalty for autoloading a library.
2801    As a result, it is now possible to have $smlnj/compiler.cm
2802    pre-registered.  This should take care of the many complaints or
2803    inquiries about missing structure Compiler.  This required changes to
2804    CM's internal data structures and small tweaks to some algorithms.
2805    
2806    As a neat additional effect, it is no longer necessary (for the sake
2807    of lean heap image files) to distinguish between a "minimal" CM and a
2808    "full" CM.  Now, there is only one CM (i.e., the "full" version:
2809    $smlnj/cm.cm aka $smlnj/cm/full.cm), and it is always available at the
2810    interactive top level. ($smlnj/cm/minimal.cm is gone.)
2811    
2812    To make the life of compiler-hackers easier, "makeml" now also
2813    pre-registers $smlnj/cmb.cm (aka $smlnj/cmb/current.cm).  In other
2814    words, after you bootstrap a new sml for the first time, you will not
2815    have to autoload $smlnj/cmb.cm again afterwards.  (The first time
2816    around you will still have to do it, though.)
2817    
2818    * A second change consists of major updates to the CM manual.  There
2819    are now several appendices with summary information and also a full
2820    specification of the CM description file syntax.
2821    
2822    * In directory src/system I added the script "allcross".  This script
2823    invokes sml and cross-compiles the compiler for all supported
2824    architectures.  (Useful when providing a new set of boot files.)
2825    
2826    * There seems to be a latent bug in my "lazy pickles" mechanism.  I
2827    added a small tweak to pickle-util.sml to work around this problem,
2828    but it is not a proper fix yet.  I will investigate further.  (The
2829    effect of the bug was an inflation of library pickle size.)
2830    
2831    * Version number increased to 110.28.1 (to avoid compatibility problems).
2832    
2833    ----------------------------------------------------------------------
2834    Name: Allen Leung
2835    Date: 2000/05/25 17:28 EDT
2836    Tag: leunga-20000525-ra
2837    Description:
2838    
2839      Fixed a bug in freezing phase of the register allocator.
2840    
2841    ----------------------------------------------------------------------
2842    Name: Allen Leung
2843    Date: 2000/05/15 22:53 EDT
2844    Tag: leunga-20000515-alpha-x86-ra
2845    Description:
2846    
2847      1. Alpha
2848    
2849          Slight cleanup.  Removed the instruction SGNXL
2850    
2851      2. X86
2852    
2853          Added the following instructions to the instruction set:
2854    
2855            ROLx, RORx,
2856            BTx, BTSx, BTLx, BTRx,
2857            XCHGx, and variants with the LOCK prefix
2858    
2859      3. Register Allocation
2860    
2861          The module ra-rewrite-with-renaming has been improved.
2862    
2863      These have no effect on SML/NJ.
2864    
2865    ----------------------------------------------------------------------
2866    Name: Matthias Blume
2867    Date: 2000/05/15 16:20:00 JST
2868    Tag: blume-20000515-lightrebuild
2869    Description:
2870    
2871    1. I added an alternative to "-rebuild" to "makeml".  The difference is
2872       that prior to calling CMB.make' the CM-variable "LIGHT" will be
2873       defined.  In effect, the command will not build any cross-compiler
2874       backends and therefore finish more quickly.
2875    
2876       The "fixpt" script also takes a "-light" switch to be able to use
2877       this new facility while compiling for a fixpoint.
2878    
2879    2. I replaced all mentions of anchored paths in group owner specifications
2880       with simple relative paths (usually starting with "..").
2881       The rationale is that a library's internal workings should not be
2882       compromised by the lack of some anchor.  (An anchor is necessary
2883       for someone who wants to refer to the library by an anchored path,
2884       but it should not be necessary to build the same library in the first
2885       place.)
2886    
2887    3. I changed the way CM's tool mechanism determines the shell command
2888       string used for things like ml-yacc etc. so that it does not break
2889       when CM.Control.implicit_anchors is turned off.
2890    
2891    ----------------------------------------------------------------------
2892    Name: Matthias Blume
2893    Date: 2000/05/12 18:20:00 JST
2894    Tag: blume-20000512-ml-build
2895    Description:
2896    
2897    Fixed a bug in config/_ml-build that prevented ml-yacc and ml-lex from
2898    getting installed properly (by config/install.sh).
2899    
2900    ----------------------------------------------------------------------
2901    Name: Matthias Blume
2902    Date: 2000/05/12 17:30:00 JST
2903    Tag: blume-20000512-anchors
2904    Description:
2905    
2906    !!! NEW BOOT FILES !!!
2907    
2908    This change is in preparation of fading out support for "implicitly
2909    anchored path names".  I went through all sources and used the
2910    explicit (and relatively new) $-notation.  See system/README and the
2911    CM manual for more info on this.
2912    
2913    I also modified the anchoring scheme for some things such as "smlnj",
2914    "MLRISC", "cm", etc. to take advantage of the fact that explicit
2915    anchors are more expressive: anchor name and first arc do not have to
2916    coincide.  This entails the following user-visible change:
2917    
2918    You have to write $smlnj/foo/bar instead of smlnj/foo/bar.  In
2919    particular, when you fire up sml with a command-line argument, say,
2920    e.g.:
2921    
2922       sml '$smlnj/cmb.cm'
2923    
2924    At the ML toplevel prompt:
2925    
2926       CM.autoload "$smlnj/cmb.cm";
2927    
2928    There is also a new controller in CM.Control that can be used to turn
2929    off all remaining support for implicit anchors by saying:
2930    
2931        CM.autoload "$smlnj/
2932        #set CM.Control.implicit_anchors false;
2933    
2934    This causes CM to reject implicitly anchored paths.  This is (for the
2935    time being) less permissive than the "final" version where there will
2936    be no more such implicit anchors and relative paths will be just that:
2937    relative.
2938    
2939    The next step (version after next version?) will be to make the
2940    default for CM.Control.implicit_anchors false.  After the dust has
2941    settled, I can then produce the "final" version of this...
2942    
2943    Note: Since bootstrapping is a bit tricky, I provided new boot files.
2944    
2945    ----------------------------------------------------------------------
2946    Name: Matthias Blume
2947    Date: 2000/05/11 16:30:00 JST
2948    Tag: blume-20000511-sources
2949    Description:
2950    
2951    The main change is that I added function CM.sources as a generalized
2952    version of the earlier CM.makedepend.  This entails the following
2953    additional changes:
2954    
2955      - CM.makedepend has been dropped.
2956    
2957      - CM manual has been updated.
2958    
2959      - TOOLS signature and API have been changed.
2960    
2961    ----------------------------------------------------------------------
2962    Name: Allen Leung
2963    Date: 2000/05/10 21:17 EDT
2964    Tag: leunga-20000510-moby-c--ssa
2965    Description:
2966    
2967      Various bug fixes and new features for C--, Moby and MLRISC optimizations.
2968    None of these affect SML/NJ.
2969    
2970    1. Register Allocation
2971    
2972        a. A new ra spilling module (ra/ra-spill-with-renaming) is implemented.
2973           This module tries to remove local (i.e. basic block level) redundancies
2974           during spilling.
2975    
2976        b. A new framework for performing region based register allocation.
2977           Not yet entirely functional.
2978    
2979    2. X86
2980    
2981       a. DefUse for POP was missing the stack pointer [found by Lal]
2982       b. Reload for CALL was incorrect in X86Spill [found by John]
2983       c. Various fixes in X86Spill so that it can be used correctly for
2984          the new spilling module.
2985    
2986    3. SSA/IR
2987    
2988       a. New module ir/dj-dataflow.sml implements elimination based
2989          data flow analysis.
2990    
2991    4. MLRiscGen
2992    
2993       a. Fix for gc type annotation
2994    
2995    5. MDGen
2996    
2997       Various fixes for machine description -> ml code translation.  For ssa
2998       only.
2999    
3000    ----------------------------------------------------------------------
3001    Name: Allen Leung
3002    Date: 2000/05/08 22:17 EDT
3003    Tag: leunga-20000508-labexp
3004    Description:
3005    
3006      Fermin has found a few assembly problems with constant expressions
3007      generated in LabelExp.  Mostly, the problems involve extra parentheses,
3008      which choke on dumb assemblers.  This is his fix.
3009    
3010    ----------------------------------------------------------------------
3011    Name: Dave MacQueen
3012    Date: 2000/04/09 14:00 EDT
3013    Tag: dbm-20000502-Version_110_28
3014    Description:
3015    
3016    1. Updated src/compiler/TopLevel/main/version.sml to version 110.28
3017    
3018    2. Updated config/version to 110.28
3019    
3020    3. Updated config/srcarchiveurl
3021    
3022    3. New boot files!
3023       ftp://ftp.research.bell-labs.com/dist/smlnj/working/110.28/
3024    
3025    ----------------------------------------------------------------------
3026    Name: Matthias Blume
3027    Date: 2000/05/01 19:05:00 JST
3028    Tag: blume-20000501-noweb
3029    Description:
3030    
3031    A new noweb tool has been added.  The existing system is entirely
3032    unaffected by this, but some CM users have asked for renewed noweb
3033    support.  Everything is documented in the CM manual.
3034    
3035    New (plugin) libraries:
3036    
3037       noweb-tool.cm
3038       nw-ext.cm
3039    
3040    ----------------------------------------------------------------------
3041    Name: Dave MacQueen
3042    Date: 2000/04/30 12:40PM EDT
3043    Tag: dbm-20000430-bug_fixes
3044    Description:
3045    
3046    1. Fix for bug 1498
3047       smlnj/src/system/Basis/Implementation/Unsafe/object.sig
3048       smlnj/src/system/Basis/Implementation/Unsafe/object.sml
3049         added toRealArray function
3050       smlnj/src/compiler/MiscUtil/print/ppobj.sml
3051         added check for tag Obj.RealArray to array printing case in ppObj
3052    
3053    2. Fix for bug 1510
3054       smlnj/src/compiler/Semant/types/typesutil.sml
3055         fixed definition of dummyargs (used by equalTycon) so that
3056         dummy args are distinct types
3057    
3058    ----------------------------------------------------------------------
3059    Name: Matthias Blume
3060    Date: 2000/04/30 01:00:00 JST
3061    Tag: blume-20000430-versions
3062    Description:
3063    
3064    1. CM version numbering added.  This is an implementation of Lal's
3065       proposal for adding version numbers and version checking to .cm
3066       files.  Lal said that his proposal was just that -- a proposal.
3067       For the time being I went ahead and implemented it so that people
3068       can comment on it.  Everything is completely backward-compatible
3069       (except for the stable library format, i.e., new bootfiles!).
3070    
3071       As usual, see the CM manual for details.
3072    
3073    2. An alternative syntax for anchored paths has been implemented.
3074       Dave has recently voiced the same concerns that I had when I did
3075       this, so there should be some support.  My take is that eventually
3076       I will let support for the current syntax (where anchors are
3077       "implicit") fade out in favor of the new, explicit syntax.
3078       In order to be backward-compatible, both old and new syntax are
3079       currently supported.
3080    
3081       Again, see the CM manual for details.
3082    
3083    3. Parallel make is trying to be slightly smarter:  When the master
3084       process finds a "bottleneck", i.e., when there is only one
3085       compilation unit that can be compiled and everybody else is
3086       waiting on it, then it will simply compile it directly instead
3087       of clumsily telling one of the slaves to do it.
3088    
3089    4. Support for "unsharing" added.  This is necessary in order to be
3090       able to have two different versions of the same library running
3091       at the same time (e.g., for trying out a new MLRISC while still
3092       having the old MLRISC linked into the current compiler, etc.)
3093       See the CM manual.
3094    
3095    5. Simple "makedepend" functionality added for generating Makefile
3096       dependency information.  (This is rather crude at the moment.
3097       Expect some changes here in the future.)
3098    
3099    6. ".fun" added as a recognized suffix for ML files. Also documented
3100       explicitly in the manual that the fallback behavior (unknown suffix
3101       -> ML file) is not an official feature!
3102    
3103    7. Small changes to the pickler for stable libraries.
3104    
3105    8. Several internal changes to CM (for cleanup/improvement).
3106    
3107    
3108    !!!! NEW BINFILES !!!!
3109    
3110    ----------------------------------------------------------------------
3111    Name: Matthias Blume
3112    Date: 2000/04/28 17:30:00 JST
3113    Tag: blume-20000428-pathconfig
3114    Description:
3115    
3116    1. I changed config/install.sh to remove duplicate entries from the
3117       lib/pathconfig file at the end.  Moreover, the final version of
3118       lib/pathconfig is sorted alphabetically.  The same (sorting) is done
3119       in src/system/installml.
3120    
3121    2. The config/install.sh script now consistently uses relative
3122       pathnames in lib/pathconfig whenever the anchor is in the lib
3123       directory.  (So far this was true for the libraries that come
3124       pre-compiled and bundled as part of the bootfiles but not for
3125       libraries that are compiled by the script itself.)
3126    
3127    ----------------------------------------------------------------------
3128    Name: Matthias Blume
3129    Date: 2000/04/26 13:10:00 JST
3130    Tag: blume-20000426-fun_suffix
3131    Description:
3132    
3133    Added ".fun" as a recognized file name suffix (for ML code).
3134    
3135    ----------------------------------------------------------------------
3136    Name: Allen Leung
3137    Date: 2000/04/25 17:00:00 EST
3138    Tag: leunga-20000425-alpha-ra
3139    Description:
3140    
3141    1. Alpha
3142    
3143        PSEUDOARITH was missing in AlphaRewrite.  This causes an endless loop
3144    in C--.
3145    
3146    2. RA
3147    
3148       Added a flag "ra-dump-size" to print out the size of the flowgraph
3149       and the interference graph.
3150    
3151    ----------------------------------------------------------------------
3152    Name: Dave MacQueen
3153    Date: 2000/04/25/
3154    Tag: dbm-20000425-mlyacc_doc_examples
3155    Description:
3156      Updated mlyacc.tex sections 5 and 7 for SML '97 and CM.
3157      Updated all three examples in src/ml-yacc/examples to run
3158      under 110.* using CM.make.
3159    
3160    ----------------------------------------------------------------------
3161    Name: Allen Leung
3162    Date: 2000/04/20 23:04:00 EST
3163    Tag: leunga-20000420-ssa-c---stuff
3164    Description:
3165    
3166      This update synchronizes my repository with Yale's.  Most of these
3167    changes, however, do not affect SML/NJ at all (the RA is an exception).
3168    
3169    1. Register Allocator
3170    
3171       a. An improvement in the interference graph construction:
3172          Given a copy
3173    
3174                s <- t
3175    
3176          no interference edge between s and t is added for this definition of s.
3177    
3178       b. I've added two new spill heuristic modules that Fermin and I developed
3179          (in the new library RA.cm). These are unused in SML/NJ but maybe
3180          useful for others (Moby?)
3181    
3182    2. X86
3183    
3184       a. Various fixes in the backend provided by Fermin [C--] and Lal.
3185    
3186    3. Alpha
3187    
3188       a. Added the BSR instruction and code generation that goes with it [C--]
3189       b. Other fixes too numerous to recount provided by Fermin [C--]
3190    
3191    4. Regmaps
3192    
3193       a. The regmaps are not initialized with the identity physical bindings
3194          at creation time.  This is unneeded.
3195    
3196    5. MLRISC Optimizations
3197    
3198       a. The DJ-Graph module can now compute the iterated dominance frontiers
3199          intersects with liveness incrementally in linear time! Woohoo!
3200          This is now used in my new SSA construction algorithm.
3201    
3202       b. THe branch reorganization module is now smarter about linear chains of
3203          basic blocks.
3204    
3205    
3206    ----------------------------------------------------------------------
3207    Name: Matthias Blume
3208    Date: 2000/04/12 13:52:00 JST
3209    Tag: blume_main_v110p27_1
3210    Description:
3211    
3212    Changed install.sh script to handle archive files without version number
3213    and to use "boot.<arch>-<os>" instead of "sml.boot.<arch>-<os>" for the
3214    name of the boot file archive.
3215    
3216    ----------------------------------------------------------------------
3217    Name: Dave MacQueen
3218    Date: 2000/04/09 14:00 EDT
3219    Tag: dbm-20000410-Version_110_27
3220    Description:
3221    
3222    1. Updated src/compiler/TopLevel/main/version.sml to version 110.27
3223    
3224    2. Updated src/config/version to 110.27
3225    
3226    3. New boot files!
3227    
3228    ----------------------------------------------------------------------
3229    Name: Allen Leung
3230    Date: 2000/04/09 19:09:00 EST
3231    Tag: leunga-20000409-misc
3232    Description:
3233    
3234    1.  Yet another fix for x86 assembly for idivl, imull, mull and friends.
3235    
3236    2.  Miscellaneous improvements to MLRISC (unused in sml/nj)
3237    
3238    ----------------------------------------------------------------------
3239    Name: Stefan
3240    Date: 2000/04/07 10:00:00 EDT
3241    Tag: monnier-20000406-branch-handling
3242    Description:
3243    
3244    Improved handling of branches (mostly those generated from
3245    polymorphic equality), removed switchoff and changed the
3246    default optimization settings (more cpsopt and less flintopt).
3247    
3248    ----------------------------------------------------------------------
3249    Name: Allen Leung
3250    Date: 2000/04/06 01:30:00 EST
3251    Tag: leunga-20000406-peephole-x86-SSA-2
3252    Description:
3253    
3254       Forgot a few files.
3255    
3256    ----------------------------------------------------------------------
3257    Name: Allen Leung
3258    Date: 2000/04/06 00:36:00 EST
3259    Tag: leunga-20000406-peephole-x86-SSA
3260    Description:
3261    
3262    1.  New Peephole code
3263    
3264    2.  Minor improvement to X86 instruction selection
3265    
3266    3.  Various fixes to SSA and machine description -> code translator
3267    
3268    ----------------------------------------------------------------------
3269    Name: Matthias Blume
3270    Date: 2000/04/05 12:30:00 JST
3271    Tag: blume_main_v110p26p2_3
3272    Description:
3273    
3274    This update just merges three minor cosmetic updates to CM's sources
3275    to get ready for the 110.27 code freeze on Friday.  No functionality
3276    has changed.
3277    
3278    ----------------------------------------------------------------------
3279    Name: Allen Leung
3280    Date: 2000/04/04 19:39:00 EST
3281    Tag: leunga-20000404-x86-asm
3282    Description:
3283    
3284    1.  Fixed a problem in X86 assembly.
3285    
3286        Things like
3287    
3288           jmp %eax
3289           jmp (%eax)
3290    
3291        should be output as
3292    
3293           jmp *%eax
3294           jmp *(%eax)
3295    
3296    2.  Assembly output
3297    
3298          Added a new flag
3299    
3300              "asm-indent-copies" (default to false)
3301    
3302          When this flag is on, parallel copies will be indented an extra level.
3303    
3304    ----------------------------------------------------------------------
3305    Name: Allen Leung
3306    Date: 2000/04/04 03:18:00 EST
3307    Tag: leunga-20000404-C--Moby
3308    Description:
3309    
3310        All of these fixes are related to C--, Moby, and my own optimization
3311        stuff; so they shouldn't affect SML/NJ.
3312    
3313    1.  X86
3314    
3315        Various fixes related floating point, and extensions.
3316    
3317    2.  Alpha
3318    
3319        Some extra patterns related to loads with signed/zero extension
3320        provided by Fermin.
3321    
3322    3.  Assembly
3323    
3324        When generating assembly, resolve the value of client defined constants,
3325        instead of generating symbolic values.  This is controlled by the
3326        new flag "asm-resolve-constants", which is default to true.
3327    
3328    4.  Machine Descriptions
3329    
3330        a. The precedence parser was slightly broken when parsing infixr symbols.
3331        b. The type generalizing code had the bound variables reversed, resulting
3332           in a problem during arity raising.
3333        c. Various fixes in machine descriptions.
3334    
3335    ----------------------------------------------------------------------
3336    Name: Matthias Blume
3337    Date: 2000/04/03 16:05:00 JST
3338    Tag: blume_main_v110p26p2_2
3339    Description:
3340    
3341    I eliminated coreEnv from compInfo.  Access to the "Core" structure is
3342    now done via the ordinary static environment that is context to each
3343    compilation unit.
3344    
3345    To this end, I arranged that instead of "structure Core" as "structure
3346    _Core" is bound in the pervasive environment.  Core access is done via
3347    _Core (which can never be accidentally rebound because _Core is not a
3348    legal surface-syntax symbol).
3349    
3350    The current solution is much cleaner because the core environment is
3351    now simply part of the pervasive environment which is part of every
3352    compilation unit's context anyway.  In particular, this eliminates all
3353    special-case handling that was necessary until now in order to deal
3354    with dynamic and symbolic parts of the core environment.
3355    
3356    Remaining hackery (to bind the "magic" symbol _Core) is localized in the
3357    compilation manager's bootstrap compiler (actually: in the "init group"
3358    handling).  See the comments in src/system/smlnj/init/init.cmi for
3359    more details.
3360    
3361    I also tried to track down all mentions of "Core" (as string argument
3362    to Symbol.strSymbol) in the compiler and replaced them with a
3363    reference to the new CoreSym.coreSym.  Seems cleaner since the actual
3364    name appears in one place only.
3365    
3366    Binfile and bootfile format have not changed, but the switchover from
3367    the old "init.cmi" to the new one is a bit tricky, so I supplied new
3368    bootfiles anyway.
3369    
3370    ----------------------------------------------------------------------
3371    Name: Allen Leung
3372    Date: 2000/04/02 21:17:00 EST
3373    Tag: leunga-20000402-mltree
3374    Description:
3375    
3376       1. Renamed the constructor CALL in MLTREE by popular demand.
3377       2. Added a bunch of files from my repository.  These are currently
3378          used by other non-SMLNJ backends.
3379    
3380    ----------------------------------------------------------------------
3381  Name: Allen Leung  Name: Allen Leung
3382  Date: 2000/03/31 21:15:00 EST  Date: 2000/03/31 21:15:00 EST
3383  Tag: leunga-20000331-aliasing  Tag: leunga-20000331-aliasing
# Line 104  Line 3469 
3469     (specified in the .cm file at each instance where the tool's class is     (specified in the .cm file at each instance where the tool's class is
3470     used).     used).
3471    
3472     This was done to accomodate the new "make" and "shell" tools which     This was done to accommodate the new "make" and "shell" tools which
3473     facilitate fairly seemless hookup to portions of code managed using     facilitate fairly seamless hookup to portions of code managed using
3474     Makefiles or Shell scripts.     Makefiles or Shell scripts.
3475    
3476     There are no classes "shared" or "private" anymore.  Instead, the     There are no classes "shared" or "private" anymore.  Instead, the
# Line 117  Line 3482 
3482    
3483     All existing tools are described in the CM manual.     All existing tools are described in the CM manual.
3484    
3485     - Slightly better error handling.  (CM now surpresses many followup     - Slightly better error handling.  (CM now suppresses many followup
3486     error messages that tended to be more annoying than helpful.)     error messages that tended to be more annoying than helpful.)
3487    
3488  2. Major changes to the compiler's static environment data structures.  2. Major changes to the compiler's static environment data structures.
# Line 148  Line 3513 
3513       elaborator). There were a lot of changes during my "linkpath" trials       elaborator). There were a lot of changes during my "linkpath" trials
3514       that could have been reverted to their original state but weren't.       that could have been reverted to their original state but weren't.
3515       Please, don't be too harsh on me for messing with this code a bit more       Please, don't be too harsh on me for messing with this code a bit more
3516       than what was strictly necessary...  (I _did_ resist the tempation       than what was strictly necessary...  (I _did_ resist the temptation
3517       of doing any "global reformatting" to avoid an untimely death at       of doing any "global reformatting" to avoid an untimely death at
3518       Dave's hands. :)       Dave's hands. :)
3519    
# Line 251  Line 3616 
3616    
3617       I've changed andl to testl in the floating point test sequence       I've changed andl to testl in the floating point test sequence
3618       whenever appropriate.  The Intel optimization guide states that       whenever appropriate.  The Intel optimization guide states that
3619       testl is perferable to andl.       testl is preferable to andl.
3620    
3621  7. RA (x86 only)  7. RA (x86 only)
3622    
# Line 433  Line 3798 
3798    
3799  1. Tools.registerStdShellCmdTool (from smlnj/cm/tool.cm) takes an  1. Tools.registerStdShellCmdTool (from smlnj/cm/tool.cm) takes an
3800  additional argument called "template" which is an optional string that  additional argument called "template" which is an optional string that
3801  specifiel the layout of the tool command line.  See the CM manual for  specifies the layout of the tool command line.  See the CM manual for
3802  explanation.  explanation.
3803    
3804  2. A special-purpose tool can be "regisitered" by simply dropping the  2. A special-purpose tool can be "registered" by simply dropping the
3805  corresponding <...>-tool.cm (and/or <...>-ext.cm) into the same  corresponding <...>-tool.cm (and/or <...>-ext.cm) into the same
3806  directory where the .cm file lives that uses this tool.  (The  directory where the .cm file lives that uses this tool.  (The
3807  behavior/misfeature until now was to look for the tool description  behavior/misfeature until now was to look for the tool description
# Line 480  Line 3845 
3845  rebuild.  Having sets of the form <base><k>.{bin,boot}.<arch>-unix for  rebuild.  Having sets of the form <base><k>.{bin,boot}.<arch>-unix for
3846  <k>=1,2,... is normally not a good idea when invoking fixpt.  However,  <k>=1,2,... is normally not a good idea when invoking fixpt.  However,
3847  they might be the result of an earlier partial run of fixpt (which  they might be the result of an earlier partial run of fixpt (which
3848  perhaps got accidentially killed).  In this case, fixpt will quickly  perhaps got accidentally killed).  In this case, fixpt will quickly
3849  move through what exists before continuing where it left off earlier,  move through what exists before continuing where it left off earlier,
3850  and, thus, saves a lot of time.  and, thus, saves a lot of time.
3851    
# Line 530  Line 3895 
3895    it from that remote directory.    it from that remote directory.
3896    This should simplify installation further:  For machines that have    This should simplify installation further:  For machines that have
3897    access to the internet, just fetch <version>-config.tgz, unpack it,    access to the internet, just fetch <version>-config.tgz, unpack it,
3898    edit config/targets, and go (run config/install.sh).  The scipt will    edit config/targets, and go (run config/install.sh).  The script will
3899    fetch everything else that it might need all by itself.    fetch everything else that it might need all by itself.
3900    
3901    For CVS users, this mechanism is not relevant for source archives, but    For CVS users, this mechanism is not relevant for source archives, but

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