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revision 607, Mon Apr 10 16:31:03 2000 UTC revision 961, Tue Oct 16 15:32:39 2001 UTC
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11  Date:  Date:
12  Tag: <post-commit CVS tag>  Tag: <post-commit CVS tag>
13  Description:  Description:
14    
15    ----------------------------------------------------------------------
16    Name: Matthias Blume
17    Date: 2001/10/16 11:32:00 EDT
18    Tag: blume-20011016-netbsd
19    Description:
20    
21    Underscore patch from Chris Richards (fixing problem with compiling
22    runtime system under recent NetBSD).
23    
24    ----------------------------------------------------------------------
25    Name: Allen Leung
26    Date: 2001/10/12 17:18:32 EDT 2001
27    Tag: leung-20011012-x86-printflowgraph
28    Description:
29    
30    X86RA now uses a valid (instead of dummy) PrintFlowgraph module.
31    
32    ----------------------------------------------------------------------
33    Name: Lal George
34    Date: 2001/10/11 23:51:34 EDT
35    Tag: george-20011011-too-many-instrs
36    Description:
37    
38    The representation of a program point never expected to see more
39    than 65536 instructions in a basic block!
40    
41    ----------------------------------------------------------------------
42    Name: Lal George
43    Date: 2001/10/09 09:41:37 EDT
44    Tag: george-20011008-mlrisc-labels
45    Description:
46    
47    Changed the machine description files to support printing of
48    local and global labels in assembly code, based on host assembler
49    conventions.
50    
51    ----------------------------------------------------------------------
52    Name: Matthias Blume
53    Date: 2001/09/25 15:25:00 EDT
54    Tag: blume-20010925-exninfo
55    Description:
56    
57    I provided a non-hook implementation of exnName (at the toplevel) and
58    made the "dummy" implementation of exnMessage (at the toplevel) more
59    useful: if nothing gets "hooked in", then at least you are going to
60    see the exception name and a message indicating why you don't see more.
61    
62    [For the time being, programs that need exnMessage and want to use
63    ml-build should either use General.exnMessage (strongly recommended) or
64    refer to structure General at some other point so that CM sees a
65    static dependency.]
66    
67    [Similar remarks go for "print" and "use":  If you want to use their
68    functionality in stand-alone programs generated by ml-build, then use
69    TextIO.output and Backend.Interact.useFile (from $smlnj/compiler.cm).]
70    
71    ----------------------------------------------------------------------
72    Name: Matthias Blume
73    Date: 2001/09/20 17:28:00 EDT
74    Tag: blume-20010920-slowfp
75    Description:
76    
77    Allen says that x86-fast-fp is not safe yet, so I turned it off again...
78    
79    ----------------------------------------------------------------------
80    Name: Matthias Blume
81    Date: 2001/09/20 17:20:00 EDT
82    Tag: blume-20010920-canonicalpaths
83    Description:
84    
85    0. Updated the BOOT file (something that I forgot to do earlier).
86    
87    1. Small internal change to CM so that it avoids "/../" in filenames
88       as much as possible (but only where it is safe).
89    
90    2. Changed config/_run-sml (resulting in a changed bin/.run-sml) so
91       that arguments that contain delimiters are passed through correctly.
92       This change also means that all "special" arguments of the form
93       @SMLxxx... must come first.
94    
95    3. Changed install script to put relative anchor names for tool commands
96       into pathconfig.
97    
98    ----------------------------------------------------------------------
99    Name: Matthias Blume
100    >>>>>>> 1.169
101    Date: 2001/09/18 15:35:00 EDT
102    Tag: blume-20010918-readme11036
103    Description:
104    
105    Added README files.
106    
107    ----------------------------------------------------------------------
108    Name: Matthias Blume
109    Date: 2001/09/18 11:45:00 EDT
110    Tag: Release_110_36 (retag)
111    Description:
112    
113    Fixed mistake in config/preloads. Retagged as 110.36.
114    
115    ----------------------------------------------------------------------
116    Name: Matthias Blume
117    Date: 2001/09/18 09:40:00 EDT
118    Tag: Release_110_36_orig (tag changed)
119    Description:
120    
121    New version (110.36).  New bootfiles.
122    
123    ----------------------------------------------------------------------
124    Name: Matthias Blume
125    Date: 2001/09/14 16:15:00 EDT
126    Tag: blume-20010914-x86fastfp
127    Description:
128    
129    John committed some changes that Allen made, in particular a (hopefully)
130    correctly working version of the x86-fp module.
131    
132    I changed the default setting of the Control.MLRISC.getFlag "x86-fast-fp"
133    flag to "true".  Everything seems to compile to a fixpoint ok, and
134    "mandelbrot" speeds up by about 15%.
135    
136    ----------------------------------------------------------------------
137    Name: Matthias Blume
138    Date: 2001/09/13 11:20:00 EDT
139    Tag: blume-20010913-minimal
140    Description:
141    
142    1. Stefan Monnier's patch to fix a miscompilation problem that
143       was brought to light by John Reppy's work on Moby.
144    
145    2. Implemented a minimal "structure Compiler" that contains just
146       "version" and "architecture".  The minimal version will be
147       available when the full version is not.  This is for backward-
148       compatibility with code that wants to test Compiler.version.
149    
150    ----------------------------------------------------------------------
151    Name: Matthias Blume
152    Date: 2001/08/28 14:03:00 EDT
153    Tag: blume-20010828-ml-lex
154    Description:
155    
156    Fix for bug 1581, received from Neophytos Michael.
157    
158    ----------------------------------------------------------------------
159    Name: Matthias Blume
160    Date: 2001/08/27 11:20:00 EDT
161    Tag: blume-20010827-readme11035
162    Description:
163    
164    Fleshed out the README file for 110.35.
165    
166    ----------------------------------------------------------------------
167    Name: Matthias Blume
168    Date: 2001/08/24 17:10:00 EDT
169    Tag: Release_110_35
170    Description:
171    
172    New version number (110.35).  New bootfiles.
173    
174    ----------------------------------------------------------------------
175    Name: Lal George
176    Date: 2001/08/24 13:47:18 EDT 2001
177    Tag: george-20010824-MLRISC-graphs
178    Description:
179    
180     removed clusters from MLRISC completely and replaced with graphs.
181    
182    ----------------------------------------------------------------------
183    Name: Matthias Blume
184    Date: 2001/08/23 17:50:00 EDT
185    Tag: blume-20010823-toplevel
186    Description:
187    
188    - some reorganization of the code that implements various kinds of
189      environments in the compiler (static, dynamic, symbolic, combined)
190    - re-implemented the EnvRef module so that evalStream works properly
191      (if the stream contains references to "use", "CM.make", etc.)
192    - cleaned up evalloop.sml and interact.sml (but they need more cleaning)
193    
194    ----------------------------------------------------------------------
195    Name: Matthias Blume
196    Date: 2001/08/20 15:50 EDT
197    Tag: blume20010820-slipup
198    Description:
199    
200    I forgot to commit a few files.  Here they are...
201    
202    ----------------------------------------------------------------------
203    Name: Matthias Blume
204    Date: 2001/08/20 15:35:00 EDT
205    Tag: blume-20010820-debugprof
206    Description:
207    
208    !!!! NEW BOOTFILES !!!!
209    
210    This is another round of reorganizing the compiler sources.  This
211    time the main goal was to factor out all the "instrumentation"
212    passes (for profiling and backtracing) into their own library.
213    The difficulty was to do it in such a way that it does not depend
214    on elaborate.cm but only on elabdata.cm.
215    
216    Therefore there have been further changes to both elaborate.cm and
217    elabdata.cm -- more "generic" things have been moved from the former
218    to the latter.  As a result, I was forced to split the assignment
219    of numbers indicating "primtyc"s into two portions: SML-generic and
220    SML/NJ-specific.  Since it would have been awkward to maintain,
221    I bit the bullet and actually _changed_ the mapping between these
222    numbers and primtycs.  The bottom line of this is that you need
223    a new set of bin- and bootfiles.
224    
225    I have built new bootfiles for all architectures, so doing a fresh
226    checkout and config/install.sh should be all you need.
227    
228    The newly created library's name is
229    
230        $smlnj/viscomp/debugprof.cm
231    
232    and its sources live under
233    
234        src/compiler/DebugProf
235    
236    ----------------------------------------------------------------------
237    Name: Matthias Blume
238    Date: 2001/08/15 17:15:00 EDT
239    Tag: blume-20010815-compreorg
240    Description:
241    
242    This is a first cut at reorganizing the CM libraries that make up the
243    core of the compiler.  The idea is to separate out pieces that could
244    be used independently by tools, e.g., the parser, the typechecker, etc.
245    
246    The current status is a step in this direction, but it is not quite
247    satisfactory yet.  Expect more changes in the future.
248    
249    Here is the current (new) organization...
250    
251        What used to be $smlnj/viscomp/core.cm is now divided into
252        six CM libraries:
253    
254             $smlnj/viscomp/basics.cm
255                           /parser.cm
256                           /elabdata.cm
257                           /elaborate.cm
258                           /execute.cm
259                           /core.cm
260    
261        The CM files for these libraries live under src/system/smlnj/viscomp.
262        All these libraries are proxy libraries that contain precisely
263        one CM library component.  Here are the locations of the components
264        (all within the src/compiler tree):
265    
266             Basics/basics.cm
267             Parse/parser.cm
268             ElabData/elabdata.cm
269             Elaborator/elaborate.cm
270             Execution/execute.cm
271             core.cm
272    
273         [This organization is the same that has been used already
274         for a while for the architecture-specific parts of the visible
275         compiler and for the old version of core.cm.]
276    
277         As you will notice, many source files have been moved from their
278         respective original locations to a new home in one of the above
279         subtrees.
280    
281         The division of labor between the new libraries is the following:
282    
283             basics.cm:
284                - Simple, basic definitions that pertain to many (or all) of
285                  the other libraries.
286             parser.cm:
287                - The SML parser, producing output of type Ast.dec.
288                - The type family for Ast is also defined and exported here.
289             elabdata.cm:
290                - The datatypes that describe input and output of the elaborator.
291                  This includes types, absyn, and static environments.
292             elaborator.cm:
293                - The SML/NJ type checker and elaborator.
294                  This maps an Ast.dec (with a given static environment) to
295                  an Absyn.dec (with a new static environment).
296                - This libraries implements certain modules that used to be
297                  structures as functors (to remove dependencies on FLINT).
298             execute.cm:
299                - Everything having to do with executing binary code objects.
300                - Dynamic environments.
301             core.cm:
302                - SML/NJ-specific instantiations of the elaborator and MLRISC.
303                - Top-level modules.
304                - FLINT (this should eventually become its own library)
305    
306    Notes:
307    
308    I am not 100% happy with the way I separated the elaborator (and its
309    data structures) from FLINT.  Two instances of the same problem:
310    
311        1. Data structures contain certain fields that carry FLINT-specific
312           information.  I hacked around this using exn and the property list
313           module from smlnj-lib.  But the fact that there are middle-end
314           specific fields around at all is a bit annoying.
315    
316        2. The elaborator calculates certain FLINT-related information.  I tried
317           to make this as abstract as I could using functorization, but, again,
318           the fact that the elaborator has to perform calculations on behalf
319           of the middle-end at all is not nice.
320    
321        3. Having to used exn and property lists is unfortunate because it
322           weakens type checking.  The other alternative (parameterizing
323           nearly *everything*) is not appealing, though.
324    
325    I removed the "rebinding =" warning hack because due to the new organization
326    it was awkward to maintain it.  As a result, the compiler now issues some of
327    these warnings when compiling init.cmi during bootstrap compilation. On
328    the plus side, you also get a warning when you do, for example:
329       val op = = Int32.+
330    which was not the case up to now.
331    
332    I placed "assign" and "deref" into the _Core structure so that the
333    code that deals with the "lazy" keyword can find them there.  This
334    removes the need for having access to the primitive environment
335    during elaboration.
336    
337    ----------------------------------------------------------------------
338    Name: Matthias Blume
339    Date: 2001/08/13
340    Tag: blume-20010813-closures
341    Description:
342    
343    This fix was sent to us by Zhong Shao.  It is supposed to improve the
344    performance of certain loops by avoiding needless closure allocation.
345    
346    ----------------------------------------------------------------------
347    Name: Lal George
348    Date: 2001/07/31 10:03:23 EDT 2001
349    Tag: george-20010731-x86-fmalloc
350    Description: Fixed bug in x86 calls
351    
352        There was a bug where call instructions would mysteriously
353        vanish. The call instruction had to be one that returned
354        a floating point value.
355    
356    ----------------------------------------------------------------------
357    Name: Lal George
358    Date: 2001/07/19 16:36:29 EDT 2001
359    Tag: george-20010719-simple-cells
360    Description:
361    
362    I have dramatically simplified the interface for CELLS in MLRISC.
363    
364    In summary, the cells interface is broken up into three parts:
365    
366      1. CellsBasis : CELLS_BASIS
367    
368            CellsBasis is a top level structure and common for all
369            architectures.  it contains the definitions of basic datatypes
370            and utility  functions over these types.
371    
372      2. functor Cells() : CELLS
373    
374            Cells generates an interface for CELLS that incorporates the
375            specific resources on the target architecture, such as the
376            presence of special register classes, their number and size,
377            and various useful substructures.
378    
379      3. <ARCH>CELLS
380    
381            e.g. SparcCells: SPARCCELLS
382    
383            <ARCH>CELLS usually contains additional bindings for special
384            registers  on the architecture, such as:
385    
386                    val r0 : cell           (* register zero *)
387                    val y : cell            (* Y register *)
388                    val psr : cell          (* processor status register *)
389                    ...
390    
391            The structure returned by applying the Cells functor is opened
392            in this interface.
393    
394    The main implication of all this is that the datatypes for cells is
395    split between CellsBasis and CELLS -- a fairly simple change for user
396    code.
397    
398    In the old scheme the CELLS interface had a definitional binding of
399    the form:
400    
401            signature CELLS = sig
402    
403               structure CellsBasis = CellsBasis
404    
405               ...
406    
407            end
408    
409    With all the sharing constraints that goes on in MLRISC, this old
410    design  quickly leads to errors such as:
411    
412            "structure definition spec inside of sharing ... "
413    
414    
415    and appears to require an unacceptable amount of sharing and where
416    constraint hackery.
417    
418    I think this error message (the interaction of definitional specs and
419    sharing) requires more explanation on our web page.
420    
421    ----------------------------------------------------------------------
422    Name: Matthias Blume
423    Date: 2001/07/19 15:00:00 EDT
424    Tag: blume-20010719-libreorg
425    Description:
426    
427    This update puts together a fairly extensive but straightforward change
428    to the way the libraries that implement the interactive system are
429    organized:
430    
431       The biggest change is the elimination of structure Compiler.  As a
432       replacement for this structure, there is now a CM library
433       (known as $smlnj/compiler.cm or $smlnj/compiler/current.cm)
434       that exports all the substructures of the original structure Compiler
435       directly.  So instead of saying Compiler.Foo.bar one now simply
436       says Foo.bar.  (The CM libraries actually export a collection of
437       structures that is richer than the collection of substructures of
438       structure Compiler.)
439    
440       To make the transition smooth, there is a separate library called
441       $smlnj/compiler/compiler.cm which puts together and exports the
442       original structure Compiler (or at least something very close to it).
443    
444       There are five members of the original structure Compiler
445       that are not exported directly but which instead became members
446       of a new structure Backend (described by signature BACKEND).  These are:
447       structure Profile (: PROFILE), structure Compile (: COMPILE), structure
448       Interact (: INTERACT), structure Machine (: MACHINE), and val
449       architecture (: string).
450    
451       Structure Compiler.Version has become structure CompilerVersion.
452    
453       Cross-compilers for alpha32, hppa, ppc, sparc, and x86 are provided
454       by $smlnj/compiler/<arch>.cm where <arch> is alpha32, hppa, ppc, sparc,
455       or x86, respectively.
456       Each of these exports the same frontend structures that
457       $smlnj/compiler.cm exports.  But they do not have a structure Backend
458       and instead export some structure <Arch>Backend where <Arch> is Alpha32,
459       Hppa, PPC, Sparc, or X86, respectively.
460    
461       Library $smlnj/compiler/all.cm exports the union of the exports of
462       $smlnj/compiler/<arch>.cm
463    
464       There are no structures <Arch>Compiler anymore, use
465       $smlnj/compiler/<arch>.cm instead.
466    
467       Library host-compiler-0.cm is gone.  Instead, the internal library
468       that instantiates CM is now called cm0.cm.  Selection of the host
469       compiler (backend) is no longer done here but. (Responsibility for it
470       now lies with $smlnj/compiler/current.cm.  This seems to be more
471       logical.)
472    
473       Many individual files have been moved or renamed.  Some files have
474       been split into multiple files, and some "dead" files have been deleted.
475    
476    Aside from these changes to library organization, there are also changes
477    to the way the code itself is organized:
478    
479       Structure Binfile has been re-implemented in such a way that it no
480       longer needs any knowledge of the compiler.  It exclusively deals
481       with the details of binfile layout.  It no longer invokes the
482       compiler (for the purpose of creating new prospective binfile
483       content), and it no longer has any knowledge of how to interpret
484       pickles.
485    
486       Structure Compile (: COMPILE) has been stripped down to the bare
487       essentials of compilation.  It no longer deals with linking/execution.
488       The interface has been cleaned up considerably.
489    
490       Utility routines for dealing with linking and execution have been
491       moved into their own substructures.
492    
493       (The ultimate goal of these changes is to provide a light-weight
494       binfile loader/linker (at least for, e.g., stable libraries) that
495       does not require CM or the compiler to be present.)
496    
497    CM documentation has been updated to reflect the changes to library
498    organization.
499    
500    ----------------------------------------------------------------------
501    Name: Matthias Blume
502    Date: 2001/07/10 17:30:00 EDT
503    Tag: Release_110_34
504    Description:
505    
506    Minor tweak to 110.34 (re-tagged):
507    
508      - README.html file added to CVS repository
509      - runtime compiles properly under FreeBSD 3.X and 4.X
510    
511    ----------------------------------------------------------------------
512    Name: Matthias Blume
513    Date: 2001/07/10 17:30:00 EDT
514    Tag: Release_110_34
515    Description:
516    
517    New version number (110.34). New bootfiles.
518    
519    ----------------------------------------------------------------------
520    Name: Matthias Blume
521    Date: 2001/07/09 16:00:00 EDT
522    Tag: blume-20010709-more-varargs
523    Description:
524    
525    I changed the handling of varargs in ml-nlffigen again:
526    The ellipsis ... will now simply be ignored (with an accompanying warning).
527    
528    The immediate effect is that you can actually call a varargs function
529    from ML -- but you can't actually supply any arguments beyond the ones
530    specified explicitly.  (For example, you can call printf with its format
531    string, but you cannot pass additional arguments.)
532    
533    This behavior is only marginally more useful than the one before, but
534    it has the advantage that a function or, more importantly, a function
535    type never gets dropped on the floor, thus avoiding follow-up problems with
536    other types that refer to the offending one.
537    
538    ----------------------------------------------------------------------
539    Name: Matthias Blume
540    Date: 2001/07/09 11:25:00 EDT
541    Tag: blume-20010709-varargs
542    Description:
543    
544    1. ckit-lib.cm now exports structure Error
545    2. ml-nlffigen reports occurences of "..." (i.e., varargs function types)
546       with a warning accompanied by a source location.  Moreover, it
547       merely skips the offending function or type and proceeds with the
548       rest of its work.u  As a result, one can safely feed C code containing
549       "..." to ml-nlffigen.
550    3. There are some internal improvements to CM, providing slightly
551       more general string substitutions in the tools subsystem.
552    
553    ----------------------------------------------------------------------
554    Name: Matthias Blume
555    Date: 2001/06/27 15:10:00 EDT
556    Tag: blume-20010627-concur
557    Description:
558    
559    Fixed a small bug in CM's handling of parallel compilation.
560    (You could observe the bug by Control-C-interrupting an ordinary
561    CMB.make or CM.stabilize and then attaching some compile servers.
562    The result was that all of a sudden the previously interrupted
563    compilation would continue on its own.  This was because of
564    an over-optimization: CM did not bother to clean out certain queues
565    when no servers were attached "anyway", resulting in the contents
566    of these queues to grab control when new servers did get attached.)
567    
568    There is also another minor update to the CM manual.
569    
570    ----------------------------------------------------------------------
571    Name: Matthias Blume
572    Date: 2001/06/26 16:15:00 EDT
573    Tag: blume-20010626-cmdoc
574    Description:
575    
576    Minor typo fixed in CM manual (syntax diagram for libraries).
577    
578    ----------------------------------------------------------------------
579    Name: Matthias Blume
580    Date: 2001/06/25 22:55:00 EDT
581    Tag: blume-20010625-x86pc
582    Description:
583    
584    Fixed a nasty bug in the X86 assembly code that caused signal
585    handlers to fail (crash) randomly.
586    
587    ----------------------------------------------------------------------
588    Name: Matthias Blume
589    Date: 2001/06/25 12:05:00 EDT
590    Tag: blume-20010625-nlffigen
591    Description:
592    
593    This update fixes a number of minor bugs in ml-nlffigen as reported by
594    Nick Carter <nbc@andrew.cmu.edu>.
595    
596      1. Silly but ok typedefs of the form "typedef void myvoid;" are now accepted.
597      2. Default names for generated files are now derived from the name of
598         the C file *without its directory*.  In particular, this causes generated
599         files to be placed locally even if the C file is in some system directory.
600      3. Default names for generated signatures and structures are also derived
601         from the C file name without its directory.  This avoids silly things
602         like "structure GL/GL".
603         (Other silly names are still possible because ml-nlffigen does not do
604          a thorough check of whether generated names are legal ML identifiers.
605          When in doubt, use command line arguments to force particular names.)
606    
607    ----------------------------------------------------------------------
608    Name: Matthias Blume
609    Date: 2001/06/21 12:25:00 EDT
610    Tag: blume-20010621-eXene
611    Description:
612    
613    eXene now compiles and (sort of) works again.
614    
615    The library name (for version > 110.33) is $/eXene.cm.
616    
617    I also added an new example in src/eXene/examples/nbody.  See the
618    README file there for details.
619    
620    ----------------------------------------------------------------------
621    Name: Matthias Blume
622    Date: 2001/06/20 16:40:00 EDT
623    Tag: blume-20010620-cml
624    Description:
625    
626    CML now compiles and works again.
627    
628    Libraries (for version > 110.33):
629    
630      $cml/cml.cm            Main CML library.
631      $cml/basis.cm          CML's version of $/basis.cm.
632      $cml/cml-internal.cm   Internal helper library.
633      $cml/core-cml.cm       Internal helper library.
634      $cml-lib/trace-cml.cm  Tracing facility.
635      $cml-lib/smlnj-lib.cm  CML's version of $/smlnj-lib.cm
636    
637    The installer (config/install.sh) has been taught how to properly
638    install this stuff.
639    
640    ----------------------------------------------------------------------
641    Name: Matthias Blume
642    Date: 2001/06/19 17:55:00 EDT
643    Tag: blume-20010619-instantiate
644    Description:
645    
646    This un-breaks the fix for bug 1432.
647    (The bug was originally fixed in 110.9 but I broke it again some
648    time after that.)
649    
650    ----------------------------------------------------------------------
651    Name: Matthias Blume
652    Date: 2001/06/19 17:25:00 EDT
653    Tag: blume-20010619-signals
654    Description:
655    
656    This should (hopefully) fix the long-standing signal handling bug.
657    (The runtime system was constructing a continuation record with an
658    incorrect descriptor which would cause the GC to drop data on the floor...)
659    
660    ----------------------------------------------------------------------
661    Name: Matthias Blume
662    Date: 2001/06/15 15:05:00 EDT
663    Tag: blume-20010615-moresparc
664    Description:
665    
666    Here is a short late-hour update related to Sparc c-calls:
667    
668     -- made handling of double-word arguments a bit smarter
669    
670     -- instruction selection phase tries to collapse certain clumsily
671        constructed ML-Trees; typical example:
672    
673            ADD(ty,ADD(_,e,LI d1),LI d2)  ->  ADD(ty,e,LI(d1+d2))
674    
675        This currently has no further impact on SML/NJ since mlriscGen does
676        not seem to generate such patterns in the first place, and c-calls
677        (which did generate them in the beginning) has meanwhile been fixed
678        so as to avoid them as well.
679    
680    ----------------------------------------------------------------------
681    Name: Matthias Blume
682    Date: 2001/06/15 15:05:00 EDT
683    Tag: blume-20010615-sparc
684    Description:
685    
686    The purpose of this update is to provide an implementation of NLFFI
687    on Sparc machines.
688    
689    Here are the changes in detail:
690    
691       * src/MLRISC/sparc/c-calls/sparc-c-calls.sml is a new file containing
692       the Sparc implementation of the c-calls API.
693       * The Sparc backend of SML/NJ has been modified to uniformely use %fp
694       for accessing the ML frame.  Thus, we have a real frame pointer and
695       can freely modify %sp without need for an omit-frame-ptr phase.
696       The vfp logic in src/compiler/CodeGen/* has been changed to accomodate
697       this case.
698       * ml-nlffigen has been taught to produce code for different architectures
699       and calling conventions.
700       * In a way similar to what was done in the x86 case, the Sparc
701       backend uses its own specific extension to mltree.  (For example,
702       it needs to be able to generate UNIMP instructions which are part
703       of the calling convention.)
704       * ml-nlffi-lib was reorganized to make it more modular (in particular,
705       to make it easier to plug in new machine- and os-dependent parts).
706    
707    There are some other fairly unrelated bug fixes and cleanups as well:
708    
709       * I further hacked the .cm files for MLRISC tools (like MDLGen) so
710       that they properly share their libraries with existing SML/NJ libraries.
711       * I fixed a minor cosmetic bug in CM, supressing certain spurious
712       follow-up error messages.
713       * Updates to CM/CMB documentation.
714    
715    TODO items:
716    
717       * MLRISC should use a different register as its asmTemp on the Sparc.
718         (The current %o2 is a really bad choice because it is part of the
719         calling conventions, so things might interfere in unexpected ways.)
720    
721    ----------------------------------------------------------------------
722    Name: Matthias Blume
723    Date: 2001/06/07
724    Tag: blume-20010607-calls
725    Description:
726    
727    A number of internal changes related to C calls and calling conventions:
728    
729    1. ML-Tree CALL statements now carry a "pops" field.  It indicates the
730       number of bytes popped implicitly (by the callee).  In most cases
731       this field is 0 but on x86/win32 it is some non-zero value.  This
732       is information provided for the benefit of the "omit-frameptr" pass.
733    2. The CALL instruction on the x86 carries a similar "pops" field.
734       The instruction selection phase copies its value from the ML-Tree
735       CALL statement.
736    3. On all other architectures, the instruction selection phase checks
737       whether "pops=0" and complains if not.
738    4. The c-calls implementation for x86 now accepts two calling conventions:
739       "ccall" and "stdcall".  When "ccall" is selected, the caller cleans
740       up after the call and pops is set to 0.  For "stdcall", the caller
741       does nothing, leaving the cleanup to the callee; pops is set to
742       the number of bytes that were pushed onto the stack.
743    5. The cproto decoder (compiler/Semant/types/cproto.sml) now can
744       distinguish between "ccall" and "stdcall".
745    6. The UNIMP instruction has been added to the supported Sparc instruction
746       set. (This is needed for implementing the official C calling convention
747       on this architecture.)
748    7. I fixed some of the .cm files under src/MLRISC/Tools to make them
749       work with the latest CM.
750    
751    ----------------------------------------------------------------------
752    Name: Matthias Blume
753    Date: 2001/06/05 15:10:00 EDT
754    Tag: blume-20010605-cm-index
755    Description:
756    
757    0. The "lambdasplit" parameter for class "sml" in CM has been documented.
758    
759    1. CM can now generate "index files".  These are human-readable files
760       that list on a per-.cm-file basis each toplevel symbol defined or
761       imported.  The location of the index file for
762       <p>/<d>.cm is <p>/CM/INDEX/<d>.cm.
763       To enable index-file generation, set CM.Control.generate_index to true
764       or export an environment-symbol: export CM_GENERATE_INDEX=true.
765    
766       The CM manual has been updated accordingly.
767    
768    2. I made some slight modifications to the c-calls API in MLRISC.
769    
770         a) There is now a callback to support saving/restoring of
771            dedicated but caller-save registers around the actual call
772            instruction.
773         b) One can optionally specify a comment-annotation for the
774            call instruction.
775    
776    3. SML/NJ (mlriscGen.sml) uses this new API for the rawccall primop.
777       (For example, the comment annotation shows the C prototype of
778        the function being called.)
779    
780    ----------------------------------------------------------------------
781    Name: Matthias Blume
782    Date: 2001/06/01 13:30:00 EDT
783    Tag: blume-20010601-nlffi-cleanup
784    Description:
785    
786    This is mostly a cleanup of MLFFI stuff:
787    
788       - some signature files have been put into a more exposed place
789       - the ugly 'f type parameter is gone (simplifies types tremendously!)
790       - ml-nlffigen changed accordingly
791       - tutorial updated
792    
793    Other changes:
794    
795       - author's affiliation in CM manual(s) updated
796       - some more recognized keywords added to Allen's sml.sty
797    
798    ----------------------------------------------------------------------
799    Name: Matthias Blume
800    Date: 2001/05/25 15:30:00 EDT
801    Tag: blume-20010525-iptr
802    Description:
803    
804      - put the official 110.33-README (as it appears on the ftp server) under
805        CVS
806      - fixed a small bug related to incomplete pointer types in
807        ml-nlffigen
808      - small cosmetic change to the ml-nlffi-lib's "arr" type constructor
809        (it does not need the 'f type parameter)
810    
811    ----------------------------------------------------------------------
812    Name: Matthias Blume
813    Date: 2001/05/23 14:30:00 EDT
814    Tag: Release_110_33
815    Description:
816    
817    New version number (110.33).  New bootfiles.
818    
819    ----------------------------------------------------------------------
820    Name: Matthias Blume
821    Date: 2001/05/22 18:06:00 EDT
822    Tag: blume-20010522-targets
823    Description:
824    
825    Made install.sh use file config/targets.customized if it exists, falling
826    back to config/targets if it doesn't.  This way one can have a customized
827    version of the targets file without touching the "real thing", thus
828    eliminating the constant fear of accidentally checking something bogus
829    back into the CVS repository...  (File config/targets.customized must
830    not be added to the repository!)
831    
832    ----------------------------------------------------------------------
833    Name: Matthias Blume
834    Date: 2001/05/22 16:30:00 EDT
835    Tag: blume-20010522-minitut
836    Description:
837    
838    1. Bug fix in ml-nlffigen; now (hopefully) correctly handling
839       struct returns.
840    2. Added src/ml-nlffi-lib/Doc/mini-tutorial.txt.  This is some very
841       incomplete, preliminary documentation for NLFFI.
842    
843    ----------------------------------------------------------------------
844    Name: Matthias Blume
845    Date: 2001/05/14 11:30:00 EDT
846    Tag: blume-20010514-script
847    Description:
848    
849    Some bugs in install script fixed.
850    
851    In addition to that I also made a slight change to the NLFFI API:
852    Functors generated by ml-nlffigen now take the dynamic library as a
853    straight functor argument, not as a suspended one.  (The original
854    functor code used to force the suspension right away anyway, so there
855    was nothing gained by this complication of the interface.)
856    
857    ----------------------------------------------------------------------
858    Name: Matthias Blume
859    Date: 2001/05/11 14:35:00 EDT
860    Tag: blume-20010511-ml-nlffi
861    Description:
862    
863    I finally took the plunge and added my new FFI code to the main
864    repository.  For x86-linux it is now ready for prime-time.
865    
866    There are two new subdirectories of "src":
867    
868      - ml-nlffi-lib:
869           The utility library for programs using the FFI interface.
870           Here is the implementation of $/c.cm and its associated low-level
871           partners $/c-int.cm and $/memory.cm.
872      - ml-nlffigen:
873           A stand-alone program for generating ML glue code from C source
874           code.
875    
876    Building ml-nlffigen requires $/ckit-lib.cm.
877    
878    The config/install.sh script has been updates to do the Right Thing
879    (hopefully).
880    
881    Notice that the source tree for the C-Kit will not be put under "src"
882    but directly under the installation root directory.  (This is the
883    structure that currently exists on the CVS server when you check out
884    module "sml".)  Fortunately, config/install.sh knows about this oddity.
885    
886    Bugs: No documentation yet.
887    
888    ----------------------------------------------------------------------
889    Name: Matthias Blume
890    Date: 2001/05/09 16:35:00 EDT
891    Tag: blume-20010509-cpscontract
892    Description:
893    
894    Fixed a bug in the accounting code in cpsopt/contract.sml.  (The
895    wrapper/unwrapper elimination did not decrement usage counts and some
896    dead variables got overlooked by the dead-up logic.)
897    
898    ----------------------------------------------------------------------
899    Name: Lal George
900    Date: 2001/05/08  17:26:09 EDT
901    Tag: george-20010508-omit-frameptr
902    Description:
903    
904    Changes to implement the omit-frame-pointer optimization to support
905    raw C calls. For now, there is only support on the Intel x86, but
906    other architectures will follow as more experience is gained with this.
907    
908    
909    ----------------------------------------------------------------------
910    Name: Matthias Blume
911    Date: 2001/05/07 14:40:00 EDT
912    Tag: blume-20010507-proxies
913    Description:
914    
915    I made into "proxy libraries" all libraries that qualify for such a
916    change.  (A qualifying library is a library that has another library or
917    groups as its sole member and repeats that member's export list
918    verbatim.  A proxy library avoids this repetition by omitting its export
919    list, effectively inheriting the list that its (only) member exports.
920    See the CM manual for more explanation.)
921    The main effect is that explicit export lists for these libraries
922    do not have to be kepts in sync, making maintenance a bit easier.
923    
924    I also added copyright notices to many .cm-files.
925    
926    Last but not least, I made a new set of bootfiles.
927    
928    ----------------------------------------------------------------------
929    Name: Matthias Blume
930    Date: 2001/05/04 17:00:00 EDT
931    Tag: blume-20010504-cm-lsplit
932    Description:
933    
934    0. John merged pending changes to $/smlnj-lib.cm
935    
936    1. Allen's previous change accidentally backed out of one of Lal's
937       earlier changes.  I undid this mistake (re-introducing Lal's change).
938    
939    2. I used the new topOrder' function from graph-scc.sml (from $/smlnj-lib.cm)
940       within the compiler where applicable.  There is some code simplification
941       because of that.
942    
943    3. The "split" phase (in FLINT) is now part of the default list of phases.
944       Compiler.Control.LambdaSplitting.* can be used to globally control the
945       lambda-splitting (cross-module-inlining) engine.  In addition to that,
946       it can now also be controlled on a per-source basis: CM has been taught
947       a new tool parameter applicable to ML source files.
948    
949       - To turn lambda-splitting off completely:
950            local open Compiler.Control.LambdaSplitting in
951                val _ = set Off
952            end
953       - To make "no lambda-splitting" the global default (but allow per-source
954         overriding); this is the initial setting:
955            local open Compiler.Control.LambdaSplitting in
956                val _ = set (Default NONE)
957            end
958       - To make "lambda-splitting with aggressiveness a" the global default
959         (and allow per-source overriding):
960            local open Compiler.Control.LambdaSplitting in
961                val _ = set (Default (SOME a))
962            end
963    
964       - To turn lambda-splitting off for a given ML souce file (say: a.sml)
965         write (in the respective .cm-file):
966            a.sml (lambdasplitting:off)
967       - To turn lambda-splitting for a.sml on with minimal aggressiveness:
968            a.sml (lambdasplitting:on)
969       - To turn lambda-splitting for a.sml on with aggressiveness <a> (where
970         <a> is a decimal non-negative integer):
971            a.sml (lambdasplitting:<a>)
972       - To turn lambda-splitting for a.sml on with maximal aggressiveness:
973            a.sml (lambdasplitting:infinity)
974       - To use the global default for a.sml:
975            a.sml (lambdasplitting:default)
976         or simply
977            a.sml
978    
979    ----------------------------------------------------------------------
980    Name: Allen Leung
981    Date: 2001/05/04 01:57:00 EDT
982    Tag: leunga-20010504-sync
983    Description:
984    
985      MLRISC features.
986    
987      1. Fix to CMPXCHG instructions.
988      2. Changed RA interface to allow annotations in callbacks.
989      3. Added a new method to the stream interface to allow annotations updates.
990    
991    ----------------------------------------------------------------------
992    Name: Matthias Blume
993    Date: 2001/05/01 11:45:00 EDT
994    Tag: blume-20010501-pcedittmp
995    Description:
996    
997    Changed install.sh to use the current working directory instead of
998    /usr/tmp for a temporary file (pcedittmp).  The previous choice
999    of /usr/tmp caused trouble with MacOS X because of file premission
1000    problems.
1001    
1002    ----------------------------------------------------------------------
1003    Name: Matthias Blume
1004    Date: 2001/04/20 11:10:00 EDT
1005    Tag: blume-20010420-inMLflag
1006    Description:
1007    
1008     - added vp_limitPtrMask to vproc-state.h
1009       (for use by the raw-C-calls mechanism to implement proper interrupt
1010        handling)
1011     - made the ML compiler aware of various data-structure offsets so it
1012       can generate code for accessing the vp_inML flag and vp_limitPtrMask
1013     - tweaked mlriscGen.sml to have it emit interrupt-handling code for
1014       raw C-calls
1015    
1016    ----------------------------------------------------------------------
1017    Name: Lal George
1018    Date: 2001/04/20 09:15:28 EDT
1019    Tag: george-20010420-macosX
1020    Description:
1021    
1022     - Changes to port to Mac OS X; Darwin.
1023    
1024     - In the process I found that sqrt was broken on the PPC, because the
1025       fsqrt instruction is not implemented.
1026    
1027    ----------------------------------------------------------------------
1028    Name: Matthias Blume
1029    Date: 2001/04/18 12:45:00 EDT
1030    Tag: blume-20010418-ccalls
1031    Description:
1032    
1033     - fixed two off-by-4 errors in the x86-specific c-calls implementation
1034       (this bug prevented structure arguments containing pointers from being
1035        passed correctly)
1036     - changed the raw-C-call code in mlriscGen.sml in such a way that
1037       structure arguments are represented as a pointer to the beginning
1038       of the structure (instead of having a series of synthesized arguments,
1039       one for each structure member)
1040    
1041     - made makeml script's verbosity level configurable via environment
1042       variable (MAKEML_VERBOSITY)
1043    
1044     - eliminated placeholder implementations for f32l, w16s, i16s, and f32s
1045       in rawmem-x86.sml; we are now using the real thing
1046    
1047    ----------------------------------------------------------------------
1048    Name: Matthias Blume
1049    Date: 2001/03/22 16:25:00 EST
1050    Tag: blume-20010322-bootfiles
1051    Description:
1052    
1053    Created a new set of bootfiles (for your automatic installation convenience).
1054    
1055    ----------------------------------------------------------------------
1056    Name: Matthias Blume
1057    Date: 2001/03/22 15:10:00 EST
1058    Tag: blume-20010322-rawmem-parcm
1059    Description:
1060    
1061    1. All "raw memory access" primitives for the new FFI are implemented now
1062       (at least on the x86).
1063    2. Some further cleanup of CM's parallel make mechanism.
1064    
1065    ----------------------------------------------------------------------
1066    Name: Matthias Blume
1067    Date: 2001/03/19 17:53:00 EST
1068    Tag: blume-20010319-parallel
1069    Description:
1070    
1071    Parallel make (using compile servers) now works again.
1072    
1073    To this end, CM.stabilize and CMB.make have been modified to work in
1074    two passes when compile servers are attached:
1075       1. Compile everything, do not perform stabilization; this pass
1076          uses compile servers
1077       2. Stabilize everything; this pass does not use compile servers
1078    If there are no compile servers, the two passes are combined into one
1079    (as before).  Splitting the passes increases the inherent parallelism
1080    in the dependency graph because the entire graph including all
1081    libraries is available at the same time.  This, in turn, improves
1082    server utilization.  The downside is that the master process will
1083    have to do some extra work after compilation is done (because for
1084    technical reasons it must re-read all the binfiles during stabilization).
1085    
1086    ----------------------------------------------------------------------
1087    Name: Matthias Blume
1088    Date: 2001/03/16 12:22:00 EST
1089    Tag: blume-20010316-bootfiles
1090    Description:
1091    
1092    Created a new set of bootfiles (for your automatic installation convenience).
1093    
1094    ----------------------------------------------------------------------
1095    Name: Matthias Blume
1096    Date: 2001/03/16 11:00:00 EST
1097    Tag: blume-20010316-MLTREE-fixup
1098    Description:
1099    
1100    This is a minor fixup for an (untagged) earlier commit by Allen.
1101    (A file was missing).
1102    
1103    ----------------------------------------------------------------------
1104    Name: Allen Leung
1105    Date: Mon Mar  5 18:54:57 EST 2001
1106    Tag: leunga-20010305-cut-support
1107    
1108    1. New support for alternative control-flow in MLTREE.
1109       Currently we support
1110    
1111          FLOW_TO(CALL ...., [k1,...,kn])
1112    
1113       This is needed for 'cuts to' in C-- and try/handle-like constructs
1114       in Moby
1115    
1116       New assembler flag "asm-show-cutsto" to turn on control-flow debugging.
1117    
1118    2. Register Allocator
1119    
1120       Changes in interface [from Fermin, John]
1121    
1122    3. Alpha 8-bit SLL support [Fermin]
1123    
1124    4. All architectures
1125    
1126       A new module (ClusterExpandCopies) for expanding parallel copies.
1127    
1128    ----------------------------------------------------------------------
1129    Name: Allen Leung
1130    Date: 2001/02/27 23:07:00 EST
1131    Tag: leunga-20010227-minor-stuff
1132    
1133    1. Alpha bug fix for CMOVNE
1134    2. Handle mltree COND(..,FCMP ...,...)
1135    3. Bug fix in simplifier
1136    
1137    ----------------------------------------------------------------------
1138    Name: Matthias Blume
1139    Date: 2001/01/30 17:50:00 EST
1140    Tag: blume-20010130-sync
1141    Description:
1142    
1143    This is just a minor update to sync my devel branch with the main brach.
1144    The only visible change is the addition of some README files.
1145    
1146    ----------------------------------------------------------------------
1147    Name: Matthias Blume
1148    Date: 2001/01/12 23:30:00 JST
1149    Tag: blume-20010112-bootfiles
1150    Description:
1151    
1152    Made a new set of bootfiles that goes with the current state of the
1153    repository.
1154    
1155    ----------------------------------------------------------------------
1156    Name: Matthias Blume
1157    Date: 2001/01/12 21:20:00 JST
1158    Tag: blume-20010112-sync
1159    Description:
1160    
1161    I am just flushing out some minor changes that had accumulated in
1162    my private branch in order to sync with the main tree.  (This is
1163    mainly because I had CVS trouble when trying to merge _into_ my
1164    private branch.)
1165    
1166    Most people should be completely unaffected by this.
1167    
1168    ----------------------------------------------------------------------
1169    Name: Allen Leung
1170    Date: Thu Jan 11 21:03:00 EST 2001
1171    Tag: leunga-20010111-labexp=mltree
1172    Description:
1173    
1174    1.  Removed the type LabelExp and replace it by MLTree.
1175    2.  Rewritten mltree-simplify with the pattern matcher tool.
1176    3.  There were some bugs in alpha code generator which would break
1177        64-bit code generation.
1178    4.  Redo the tools to generate code with the
1179    5.  The CM files in MLRISC (and in src/system/smlnj/MLRISC)
1180        are now generated by perl scripts.
1181    
1182    ----------------------------------------------------------------------
1183    Name: Matthias Blume
1184    Date: 2001/01/10 21:55:00 JST
1185    Tag: blume-20010110-rcc
1186    Description:
1187    
1188    The RCC stuff now seems to work (but only on the x86).
1189    This required hacking of the c-calls interface (and -implementation) in
1190    MLRISC.
1191    
1192    Normal compiler users should be unaffected.
1193    
1194    ----------------------------------------------------------------------
1195    Name: Matthias Blume
1196    Date: 2001/01/09 01:20:00 JST
1197    Tag: blume-20010109-rcc
1198    Description:
1199    
1200    This is a fairly big patch, flushing out a large number of pending
1201    changes that I made to my development copy over the last couple of days.
1202    
1203    Of practical relevance at this moment is a workaround for a pickling
1204    bug that Allen ran into the other day.  The cause of the bug itself is
1205    still unknown and it might be hard to fix it properly, but the
1206    workaround has some merits of its own (namely somewhat reducing pickling
1207    overhead for certain libraries).  Therefore, I think this solution should
1208    be satisfactory at this time.
1209    
1210    The rest of the changes (i.e., the vast majority) has to do with my
1211    ongoing efforts of providing direct support for C function calls from
1212    ML.  At the moment there is a new primop "RAW_CCALL", typing magic
1213    in types/cproto.sml (invoked from FLINT/trans/translate.sml), a new
1214    case in the FLINT CPS datatype (RCC), changes to cps/convert.sml to
1215    translate uses of RAW_CCALL into RCC, and changes to mlriscGen.sml to
1216    handle RCC.
1217    
1218    The last part (the changes to mlriscGen.sml) are still known to be
1219    wrong on the x86 and not implemented on all other architectures.  But
1220    the infrastructure is in place. I had to change a few functor
1221    signatures in the backend to be able to route the CCalls interface
1222    from MLRISC there, and I had to specialize the mltree type (on the
1223    x86) to include the necessary extensions. (The extensions themselves
1224    were already there and redy to go in MLRISC/x86).
1225    
1226    Everything should be very happy as soon as someone helps me with
1227    mlriscGen.sml...
1228    
1229    In any case, nothing of this should matter to anyone as long as the
1230    new primop is not being used (which is going to be the case unless you
1231    find it where I hid it :). The rest of the compiler is completely
1232    unaffected.
1233    
1234    ----------------------------------------------------------------------
1235    Name: Matthias Blume
1236    Date: 2001/01/05 00:30:00 JST
1237    Tag: blume-20010105-primops
1238    Description:
1239    
1240    Added some experimental support for work that I am doing right now.
1241    These changes mostly concern added primops, but there is also a new
1242    experimental C library in the runtime system (but currently not enabled
1243    anywhere except on Linux/X86).
1244    
1245    In the course of adding primops (and playing with them), I discovered that
1246    Zhong's INL_PRIM hack (no type info for certain primops) was, in fact, badly
1247    broken.  (Zhong was very right he labeled this stuff as "major gross hack".)
1248    To recover, I made type information in INL_PRIM mandatory and changed
1249    prim.sml as well as built-in.sml accordingly.  The InLine structure now
1250    has complete, correct type information (i.e., no bottom types).
1251    
1252    Since all these changes mean that we need new binfiles, I also bumped the
1253    version number to 110.32.1.
1254    
1255    ----------------------------------------------------------------------
1256    Name: Matthias Blume
1257    Date: 2000/12/30 22:10:00 JST
1258    Tag: blume-20001230-various
1259    Description:
1260    
1261    Added proxy libraries for MLRISC and let MLRISC libraries refer
1262    to each other using path anchors.  (See CM manual for explanation.)
1263    
1264    Updated CM documentation.
1265    
1266    Fixed some bugs in CM.
1267    
1268    Implemented "proxy" libraries (= syntactic sugar for CM).
1269    
1270    Added "-quiet" option to makeml and changed runtime system accordingly.
1271    
1272    Added cleanup handler for exportML to reset timers and compiler stats.
1273    
1274    ----------------------------------------------------------------------
1275    Name: Lal George
1276    Date: 2000/12/22 22:22:58 EST 2000
1277    Tag: Release_110_32
1278    Description:
1279    
1280            Infinite precision used throughout MLRISC.
1281            see MLRISC/mltree/machine-int.sig
1282    
1283    ----------------------------------------------------------------------
1284    Name: Matthias Blume
1285    Date: 2000/12/22 23:16:00 JST
1286    Tag: blume-20001222-warn
1287    Description:
1288    
1289    Corrected wording and formatting of some CM warning message which I
1290    broke in my previous patch.
1291    
1292    ----------------------------------------------------------------------
1293    Name: Matthias Blume
1294    Date: 2000/12/22 21:20:00 JST
1295    Tag: blume-20001222-anchorenv
1296    Description:
1297    
1298    Fixed CM's handling of anchor environments in connection with CMB.make.
1299    
1300    ----------------------------------------------------------------------
1301    Name: Matthias Blume
1302    Date: 2000/12/22 13:15:00 JST
1303    Tag: blume-20001222-cleanup
1304    Description:
1305    
1306    Removed src/cm/ffi which does not (and did not) belong here.
1307    
1308    ----------------------------------------------------------------------
1309    Name: Matthias Blume
1310    Date: 2000/12/21 23:55:00 JST
1311    Tag: blume-20001221-exn
1312    Description:
1313    
1314    Probably most important: CM no longer silently swallows all exceptions
1315    in the compiler.
1316    Plus: some other minor CM changes.  For example, CM now reports some
1317    sizes for generated binfiles (code, data, envpickle, lambdapickle).
1318    
1319    ----------------------------------------------------------------------
1320    Name: Matthias Blume
1321    Date: 2000/12/15 00:01:05 JST
1322    Tag: blume-20001215-dirtool
1323    Description:
1324    
1325    - "dir" tool added.
1326    - improvements and cleanup to Tools structure
1327    - documentation updates
1328    
1329    ----------------------------------------------------------------------
1330    Name: Allen Leung
1331    Date: Thu Dec 14 03:45:24 EST 2000
1332    Description:
1333    Tag:  leunga-20001214-int-inf
1334    Description:
1335    
1336       In IntInf, added these standard functions, which are missing from our
1337    implementation:
1338    
1339        andb : int * int -> int
1340        xorb : int * int -> int
1341        orb  : int * int -> int
1342        notb : int -> int
1343         <<   : int * word -> int
1344        ~>>  : int * word -> int
1345    
1346       Not tested, I hope they are correct.
1347    
1348    ----------------------------------------------------------------------
1349    Name: Allen Leung
1350    Date: Fri Dec  8 19:23:26 EST 2000
1351    Description:
1352    Tag:  leunga-20001208-nowhere
1353    Description:
1354    
1355      Slight improvements to the 'nowhere' tool to handle OR-patterns,
1356    to generate better error messages etc.  Plus a brief manual.
1357    
1358    ----------------------------------------------------------------------
1359    Name: Lal George
1360    Date: 2000/12/08 09:54:02 EST 2000
1361    Tag: Release_110_31
1362    Description:
1363    
1364    - Version 110.31
1365    ----------------------------------------------------------------------
1366    Name: Allen Leung
1367    Date: Thu Dec  7 22:01:04 EST 2000
1368    Tag:  leunga-20001207-cell-monster-hack
1369    Description:
1370    
1371    Major MLRISC internal changes.  Affect all clients.
1372    Summary:
1373    
1374    1.  Type CELLS.cell = int is now replaced by a datatype.
1375        As a result, the old regmap is now gone.  Almost all interfaces
1376        in MLRISC change as a consequence.
1377    
1378    2.  A new brand version of machine description tool (v3.0) that generates
1379        modules expecting the new interface.  The old version is removed.
1380    
1381    3.  The RA interface has been further abstracted into two new functors.
1382        RISC_RA and X86RA.  These functors have much simpler interfaces.
1383        [See also directory MLRISC/demo.]
1384    
1385    4.  Some other new source->source code generation tools are available:
1386    
1387        a. MLRISC/Tools/RewriteGen -- generate rewriters from rules.
1388        b. MLRISC/Tools/WhereGen -- expands conditional pattern matching rules.
1389           I use this tool to generate the peephole optimizers---with the new
1390           cell type changes, peephole rules are becoming difficult to write
1391           without conditional pattern matching.
1392    
1393    5.  More Intmap -> IntHashTable change.  Previous changes by Matthias didn't
1394        cover the entire MLRISC source tree so many things broke.
1395    
1396    6.  CM files have been moved to the subdirectory MLRISC/cm.
1397        They are moved because there are a lot of them and they clutter up the
1398        root dir.
1399    
1400    7.  More detailed documentation to come...
1401    
1402        NOTE: To rebuild from 110.30 (ftp distribution), you'll have to do
1403        a makeml -rebuild first.  This is because of other other
1404        changes that Matthias has made (see below).
1405    
1406    
1407    ----------------------------------------------------------------------
1408    Name: Matthias Blume
1409    Date: 2000/11/30 23:12:00 JST
1410    Tag: blume-20001130-filereorg
1411    Description:
1412    
1413    Some manual updates and some file reorganizations in CM.
1414    
1415    ----------------------------------------------------------------------
1416    Name: Matthias Blume
1417    Date: 2000/11/24 17:45:00 JST
1418    Tag: blume-20001124-link
1419    Description:
1420    
1421    Drastically improved link traversal code for the case that the dynamic
1422    value was already loaded at bootstrap time.  As a result, CM and CMB
1423    now both load blazingly fast -- even on a very slow machine.  Also,
1424    memory consumption has been further reduced by this.
1425    
1426    Warning: The format of the PIDMAP file has changed.  THerefore, to
1427    bootstrap you have to do this:
1428    
1429    1. Run CMB.make
1430    2. Make a symbolic link for the boot directory:
1431         ln -s sml.boot.ARCH-OS xxx
1432    3. "Rebuild" the boot directory:
1433         ./makeml -boot xxx -rebuild sml ; rm xxx
1434    4. Boot normally:
1435          ./makeml
1436    
1437    ----------------------------------------------------------------------
1438    Name: Matthias Blume
1439    Date: 2000/11/21 21:20:00 JST
1440    Tag: blume-20001121-tools
1441    Description:
1442    
1443    Continued hacking on autoloading problem -- with success this time.
1444    Also changed tool-plugin mechanism.  See new CM manual.
1445    
1446    ----------------------------------------------------------------------
1447    Name: Matthias Blume
1448    Date: 2000/11/19 14:30:00 JST
1449    Tag:  blume-20001119-autoload
1450    Description:
1451    
1452    Some hacking to make autoloading faster.  Success for CMB, no success
1453    so far for CM.  There is a reduced structure CM' that autoloads faster.
1454    (This is a temporary, non-documented hack to be eliminated again when
1455    the general problem is solved.)
1456    
1457    ----------------------------------------------------------------------
1458    Name: Matthias Blume
1459    Date: 2000/11/17 14:10:00 JST
1460    Tag: blume-20001117-pickle-lib
1461    Description:
1462    
1463    1. Eliminated comp-lib.cm
1464    2. Made pickle-lib.cm
1465    3. Eliminated all uses of intset.sml (from comp-lib.cm)
1466    4. Replaced all uses of intmap.{sig,sml} (from comp-lib.cm) with
1467       equivalent constructs from smlnj-lib.cm (INtHashTable).
1468    5. Point 4. also goes for those uses of intmap.* in MLRISC.
1469       Duplicated intmap modules thrown out.
1470    6. Hunted down all duplicated SCC code and replaced it with
1471       equivalent stuff (GraphSCCFn from smlnj-lib.cm).
1472    7. Rewrote Feedback module.
1473    8. Moved sortedlist.sml into viscomp-lib.cm.  Eventually it
1474       should be thrown out and equivalent modules from smlnj-lib.cm
1475       should be used (IntRedBlackSet, IntListSet, ...).
1476    
1477    Confirmed that compiler compiles to fixpoint.
1478    
1479    ----------------------------------------------------------------------
1480    Name: Allen Leung
1481    Date: 2000/11/10 18:00:00
1482    Tag: leunga-20001110-new-x86-fp
1483    
1484    A new x86 floating point code generator has been added.
1485    By default this is turned off.  To turn this on, do:
1486    
1487        CM.autoload "$smlnj/compiler.cm";
1488        Compiler.Control.MLRISC.getFlag "x86-fast-fp" := true;
1489    
1490    Changes:
1491    
1492    1.  Changed FTAN to FPTAN so that the assembly output is correct.
1493    2.  Changed the extension callback for FTANGENT to generate:
1494    
1495              fptan
1496              fstp  %st(0)
1497        instead of
1498              fptan
1499              fstpl ftempmem
1500    
1501    3.  Numerous assembly fixes for x86.
1502    
1503    5.  Cleaned up the machine code output module x86/x86MC.sml and added
1504        support for a whole bunch of instructions and addressing modes:
1505    
1506          fadd/fsub/fsubr/fmul/fdiv/fdivr  %st, %st(n)
1507          faddp/fsubp/fsubrp/fmulp/fdivp/fdivrp  %st, %st(n)
1508          fadd/fsub/fsubr/fmul/fdiv/fdivr  %st(n), %st
1509          fiadd/fisub/fisubr/fimul/fidiv/fidivr mem
1510          fxch %st(n)
1511          fld %st(n)
1512          fst %st(n)
1513          fst mem
1514          fstp %st(n)
1515          fucom %st(n)
1516          fucomp %st(n)
1517    
1518        All these are now generated when the fast fp mode is turned on.
1519    
1520    6.  Removed the dedicated registers %st(0), ..., %st(7) from X86CpsRegs
1521    
1522    ----------------------------------------------------------------------
1523    Name: Matthias Blume
1524    Date: 2000/11/09 11:20:00 JST
1525    Tag: blume-20001109-scc
1526    Description:
1527    
1528    Eliminated some code duplication:
1529    
1530    1. Added "where" clause to GraphSCCFn in SML/NJ Library.
1531       (Otherwise the functor is useless.)
1532    2. Used GraphSCCFn where SCCUtilFun was used previously.
1533    3. Got rid of SCCUtilFun (in comp-lib.cm).
1534    
1535    ----------------------------------------------------------------------
1536    Name: Lal George
1537    Date: 2000/11/06 09:02:21 EST 2000
1538    Tag: Release_110_30
1539    Description:
1540    
1541    - Version 110.30
1542    ----------------------------------------------------------------------
1543    Name: Matthias Blume
1544    Date: 2000/11/04 14:45:00
1545    Tag: blume-20001104-mlbuild
1546    Description:
1547    
1548    - Made ml-build faster on startup.
1549    - Documentation fixes.
1550    
1551    ----------------------------------------------------------------------
1552    Name: Matthias Blume
1553    Date: 2000/11/02 17:00:00 JST
1554    Tag: blume-20001102-condcomp
1555    Description:
1556    
1557    - Small tweaks to pickler -- new BOOTFILES!
1558    - Version bumped to 110.29.2.
1559    - Added conditional compilation facility to init.cmi (see comment there).
1560    ----------------------------------------------------------------------
1561    Name: Allen Leung
1562    Date: 2000/10/23 19:31:00
1563    Tag: leunga-20001023-demo-ra
1564    
1565    1. Minor RA changes that improves spilling on x86 (affects Moby and C-- only)
1566    2. Test programs for the graph library updated
1567    3. Some new MLRISC demo programs added
1568    
1569    ----------------------------------------------------------------------
1570    Name: Matthias Blume
1571    Date: 2000/08/31 22:15:00 JST
1572    Tag: blume-20001017-errmsg
1573    Description:
1574    
1575    More error message grief: Where there used to be no messages, there
1576    now were some that had bogus error regions.  Fixed.
1577    
1578    ----------------------------------------------------------------------
1579    Name: Matthias Blume
1580    Date: 2000/08/31 17:30:00 JST
1581    Tag: blume-20001017-v110p29p1
1582    Description:
1583    
1584    I made a version 110.29.1 with new bootfiles.
1585    
1586    Changes:  Modified pickler/unpickler for faster and leaner unpickling.
1587              CM documentation changes and a small bugfix in CM's error reporting.
1588    
1589    ----------------------------------------------------------------------
1590    Name: Lal George
1591    Date: 2000/09/27 14:42:35 EDT
1592    Tag: george-20000927-nodestatus
1593    Description:
1594    
1595    Changed the type of the nodestatus, so that:
1596    
1597            SPILLED(~1)             is now SPILLED
1598            SPILLED(m) where m>=0   is now MEMREG(m)
1599            SPILLED(s) where s<~1   is now SPILL_LOC(~s)
1600    
1601    ----------------------------------------------------------------------
1602    Name: Matthias Blume
1603    Date: 2000/09/07 14:45:00 JST
1604    Tag: blume-20000907-cmerrmsg
1605    Description:
1606    
1607    Small tweak to CM to avoid getting ML syntax error messages twice.
1608    
1609    ----------------------------------------------------------------------
1610    Name: Matthias Blume
1611    Date: 2000/08/31 18:00:00 JST
1612    Tag: blume-20000831-cvsbootfiles
1613    Description:
1614    
1615    New URL for boot files (because the 110.29 files on the BL server do
1616    now work correctly with my updated install scripts for yacc and lex).
1617    
1618    ----------------------------------------------------------------------
1619    Name: Matthias Blume
1620    Date: 2000/08/08 12:33:00 JST
1621    Tag: blume-20000808-manual
1622    Description:
1623    
1624    Tiny update to CM manual.
1625    
1626    ----------------------------------------------------------------------
1627    Name: Allen Leung
1628    Date: 2000/08/7 19:31:00
1629    Tag: leunga-20000807-a-whole-bunch-of-stuff
1630    
1631      Moby, C--, SSA, x86, machine descriptions etc.  Should only affect C--
1632    and Mobdy.
1633    
1634    1.  x86
1635    
1636       a.  Fixes to peephole module by John and Dan.
1637       b.  Assembly fix to SETcc by Allen.
1638       c.  Fix to c-call by John.
1639       d.  Fix to spilling by John.  (This one deals with the missing FSTPT case)
1640       e.  Instruction selection optimization to SETcc as suggested by John.
1641    
1642           For example,
1643    
1644            MV(32, x, COND(32, CMP(32, LT, a, b), LI 1, LI 0))
1645    
1646           should generate:
1647    
1648            MOVL a, x
1649            SUBL b, x
1650            SHRL 31, x
1651    
1652    2.  IR stuff
1653    
1654         A bunch of new DJ-graph related algorithms added.  These
1655         speed up SSA construction.
1656    
1657    3.  SSA + Scheduling
1658    
1659         Added code for SSA and scheduling to the repository
1660    
1661    ----------------------------------------------------------------------
1662    Name: Lal George
1663    Date: 2000/07/27 11:53:14 EDT
1664    
1665    Tag: lal-20000727-linux-ppc
1666    Description:
1667    
1668     Made changes to support Linux PPC.
1669     p.s. I have confirmation that the 110.29 boot files work fine.
1670    
1671    ----------------------------------------------------------------------
1672    Name: Matthias Blume
1673    Date: 2000/07/27 17:40:00 JST
1674    Tag: blume-20000727-scripts
1675    Description:
1676    
1677    !!!! WARNING !!!!
1678    You must recompile the runtime system!
1679    !!!! WARNING !!!!
1680    
1681    This is basically another round of script-enhancements:
1682    
1683    1. sml, ml-build, and ml-makedepend accept options -D and -U to define
1684       and undefine CM preprocessor symbols.
1685    
1686    2. ml-build avoids generating a new heap image if it finds that the
1687       existing one is still ok.  (The condition is that no ML file had to
1688       be recompiled and all ML files are found to be older that the heap
1689       file.)
1690    
1691       To make this work smoothly, I also hacked the runtime system as
1692       well as SMLofNJ.SysInfo to get access to the heap image suffix
1693       (.sparc-solaris, ...) that is currently being used.
1694    
1695       Moreover, the signature of CM.mk_standalone has changed.  See the
1696       CM manual.
1697    
1698    3. ml-makedepend accepts additional options -n, -a, and -o.  (See the
1699       CM manual for details.)
1700    
1701    4. More CM manual updates:
1702        - all of the above has been documented.
1703        - there is now a section describing the (CM-related) command line
1704          arguments that are accepted by the "sml" command
1705    
1706    ----------------------------------------------------------------------
1707    Name: Matthias Blume
1708    Date: 2000/07/25 16:20:00 JST
1709    Tag: blume-20000725-makedepend
1710    Description:
1711    
1712    Added a script called ml-makedepend.  This can be used in makefiles
1713    for Unix' make in a way very similar to the "makedepend" command for
1714    C.
1715    
1716    The script internally uses function CM.sources.
1717    
1718    Synopsis:
1719    
1720        ml-makedepend [-f makefile] cmfile targetname
1721    
1722    The default for the makefile is "makefile" (or "Makefile" should
1723    "makefile" not exist).
1724    
1725    ml-makedepend adds a cmfile/targetname-specific section to this
1726    makefile (after removing the previous version of this section).  The
1727    section contains a single dependency specification with targetname on
1728    the LHS (targetname is an arbitrary name), and a list of files derived
1729    from the cmfile on the RHS.  Some of the files on the RHS are
1730    ARCH/OPSYS-specific.  Therefore, ml-makedepend inserts references to
1731    "make" variables $(ARCH) and $(OPSYS) in place of the corresponding
1732    path names.  The makefile writer is responsible for making sure that
1733    these variables have correct at the time "make" is invoked.
1734    
1735    ----------------------------------------------------------------------
1736    Name: Matthias Blume
1737    Date: 2000/07/22 23:30:00 JST
1738    Tag: blume-20000722-urlupdate
1739    Description:
1740    
1741    Changed BOOT and config/srcarchiveurl to point to BL server:
1742    
1743        ftp://ftp.research.bell-labs.com/dist/smlnj/working/110.29/
1744    
1745    ----------------------------------------------------------------------
1746    Name: Matthias Blume
1747    Date: 2000/07/18 18:00:00 JST
1748    Tag: blume-20000718-Version_110_29
1749    Description:
1750    
1751    1. Updated src/compiler/TopLevel/main/version.sml to version 110.29
1752    
1753    2. Updated config/version to 110.29
1754    
1755    3. Updated config/srcarchiveurl
1756    
1757    3. New boot files!
1758       ftp://ftp.cs.princeton.edu/pub/people/blume/sml/110.29-autofetch
1759    
1760    ----------------------------------------------------------------------
1761    Name: Matthias Blume
1762    Date: 2000/07/11 13:58:00 JST
1763    Tag: blume-20000711-doctypo
1764    Description:
1765    
1766    Fixed a few typos in CM manual.
1767    
1768    ----------------------------------------------------------------------
1769    Name: Allen Leung
1770    Date: 2000/06/15 00:38:00
1771    Tag: leunga-20000704-sparc-x86
1772    
1773    1. x86 peephole improvement sp += k; sp -= k => nop  [from John]
1774    2. fix to x86 RET bug [found by Dan Grossman]
1775    3. sparc assembly bug fix for ticc instructions [found by Fermin]
1776    
1777       Affects c-- and moby only
1778    
1779    ----------------------------------------------------------------------
1780    Name: Matthias Blume
1781    Date: 2000/07/04 15:26:00
1782    Tag: blume-20000704-trigger
1783    Description:
1784    
1785    1. Improvements to CM manual.
1786    2. SMLofNJ.Internals.BTrace.trigger reinstated as an alternative way
1787       of getting a back-trace.  The function, when called, raises an
1788       internal exception which explicitly carries the full back-trace history,
1789       so it is unaffected by any intervening handle-raise pairs ("trivial"
1790       or not).  The interactive loop will print that history once it arrives
1791       at top level.
1792       Short of having all exceptions implicitly carry the full history, the
1793       recommended way of using this facility is:
1794         - compile your program with instrumentation "on"
1795         - run it, when it raises an exception, look at the history
1796         - if the history is "cut off" because of some handler, go and modify
1797           your program so that it explicitly calls BTrace.trigger
1798         - recompile (still instrumented), and rerun; look at the full history
1799    
1800    ----------------------------------------------------------------------
1801    Name: Matthias Blume
1802    Date: 2000/07/03 15:36:00 JST
1803    Tag: blume-20000702-manual
1804    Description:
1805    
1806    Small corrections and updates to CM manual.
1807    
1808    ----------------------------------------------------------------------
1809    Name: Matthias Blume
1810    Date: 2000/06/29 16:04:00 JST
1811    Tag: blume-20000629-yacctool
1812    Description:
1813    
1814    Changes:
1815    
1816    1. Class "mlyacc" now takes separate arguments to pass options to
1817       generated .sml- and .sig-files independently.
1818    2. Corresponding CM manual updates.
1819    3. BTrace module now also reports call sites.  (However, for loop clusters
1820       it only shows from where the cluster was entered.)  There are associated
1821       modifications to core.sml, internals.{sig,sml}, btrace.sml, and btimp.sml.
1822    
1823    ----------------------------------------------------------------------
1824    Name: Matthias Blume
1825    Date: 2000/06/27 16:51:00 JST
1826    Tag: blume-20000627-noweb
1827    Description:
1828    
1829    Changes:
1830    
1831     1. Implemented "subdir" and "witness" options for noweb tool.
1832        This caused some slight internal changes in CM's tool implementation.
1833     2. Fixed bug in "tool plugin" mechanism.  This is essentially cleaning
1834        some remaining issues from earlier path anchor changes.
1835     3. Updated CM manual accordingly.
1836    
1837     4. Changed implementation of back-tracing so that I now consider it
1838        ready for prime-time.
1839    
1840        In particular, you don't have to explicitly trigger the back-trace
1841        anymore.  Instead, if you are running BTrace-instrumented code and
1842        there is an uncaught exception (regardless of whether or not it was
1843        raised in instrumented code), the top-level evalloop will print
1844        the back-trace.
1845    
1846        Features:
1847    
1848          - Instrumented and uninstrumented code work together seemlessly.
1849            (Of course, uninstrumented code is never mentioned in actual
1850             back-traces.)
1851    
1852          - Asymptotic time- and space-complexity of instrumented code is
1853            equal to that of uninstrumented code.  (This means that
1854            tail-recursion is preserved by the instrumentation phase.)
1855    
1856          - Modules whose code has been instrumented in different sessions
1857            work together without problem.
1858    
1859          - There is no penalty whatsoever on uninstrumented code.
1860    
1861          - There is no penalty on "raise" expressions, even in
1862            instrumented code.
1863    
1864        A potential bug (or perhaps it is a feature, too):
1865    
1866          A back-trace reaches no further than the outermost instrumented
1867          non-trivial "raise".  Here, a "trivial" raise is one that is the
1868          sole RHS of a "handle" rule.  Thus, back-traces reach trough
1869    
1870               <exp> handle e => raise e
1871    
1872          and even
1873    
1874               <exp> handle Foo => raise Bar
1875    
1876          and, of course, through
1877    
1878               <exp> handle Foo => ...
1879    
1880         if the exception was not Foo.
1881    
1882         Back-traces always reach right through any un-instrumented code
1883         including any of its "handle" expressions, trivial or not.
1884    
1885       To try this out, do the following:
1886    
1887         - Erase all existing binfiles for your program.
1888           (You may keep binfiles for those modules where you think you
1889            definitely don't need back-tracing.)
1890         - Turn on back-trace instrumentation:
1891              SMLofNJ.Internals.BTrace.mode (SOME true);
1892         - Recompile your program.  (I.e., run "CM.make" or "use".)
1893         - You may now turn instrumentation off again (if you want):
1894              SMLofNJ.Internals.BTrace.mode (SOME false);
1895         - Run your program as usual.  If it raises an exception that
1896           reaches the interactive toplevel, then a back-trace will
1897           automatically be printed.  After that, the toplevel loop
1898           will print the exception history as usual.
1899    
1900    ----------------------------------------------------------------------
1901    Name: Matthias Blume
1902    Date: 2000/06/26 09:56:46 JST
1903    Tag: blume-20000626-setup
1904    Description:
1905    
1906    CM: - setup-parameter to "sml" added; this can be used to run arbitrary
1907          ML code before and after compiling a file (e.g., to set compiler
1908          flags)
1909    
1910    Compiler: - improved btrace API (in core.sml, internals.{sig,sml})
1911              - associated changes to btrace.sml (BTrace instrumentation pass)
1912              - cleaner implementation of btimp.sml (BTrace tracing and report
1913                module)
1914    
1915    CM manual: * new path encoding documented
1916               * description of setup-parameter to "sml" added
1917    
1918    The biggest user-visible change to back-tracing is that it is no
1919    longer necessary to compile all traced modules within the same
1920    session.  (This was a real limitation.)
1921    
1922    ----------------------------------------------------------------------
1923    Name: Matthias Blume
1924    Date: 2000/06/24 12:40:00 JST
1925    Tag: blume-20000624-startup
1926    Description:
1927    
1928    Fixes startup slowdown problem.  (I was calling SrcPath.sync a _tad_
1929    bit too often -- to put it mildly. :)
1930    
1931    ----------------------------------------------------------------------
1932    Name: Matthias Blume
1933    Date: 2000/06/23 18:20:00 JST
1934    Tag: blume-20000623-btrace
1935    Description:
1936    
1937    This updates adds a backtrace facility to aid programmers in debugging
1938    their programs.  This involves the following changes:
1939    
1940    1. Module system/smlnj/init/core.sml (structure _Core) now has hooks for
1941       keeping track of the current call stack.  When programs are compiled
1942       in a special mode, the compiler will insert calls to these hooks
1943       into the user program.
1944       "Hook" means that it is possible for different implementations of
1945       back-tracing to register themselves (at different times).
1946    
1947    2. compiler/MiscUtil/profile/btrace.sml implements the annotation phase
1948       as an Absyn.dec->Absyn.dec rewrite.  Normally this phase is turned off.
1949       It can be turned on using this call:
1950         SMLofNJ.Internals.BTrace.mode (SOME true);
1951       Turning it off again:
1952         SMLofNJ.Internals.BTrace.mode (SOME false);
1953       Querying the current status:
1954         SMLofNJ.Internals.BTrace.mode NONE;
1955       Annotated programs are about twice as big as normal ones, and they
1956       run a factor of 2 to 4 slower with a dummy back-trace plugin (one
1957       where all hooks do nothing).  The slowdown with a plugin that is
1958       actually useful (such as the one supplied by default) is even greater,
1959       but in the case of the default plugin it is still only an constant
1960       factor (amortized).
1961    
1962    3. system/Basis/Implementation/NJ/internals.{sig,sml} have been augmented
1963       with a sub-structure BTrace for controlling back-tracing.  In particular,
1964       the above-mentioned function "mode" controls whether the annotation
1965       phase is invoked by the compiler.  Another important function is
1966       "trigger": when called it aborts the current execution and causes
1967       the top-level loop to print a full back-trace.
1968    
1969    4. compiler/MiscUtil/profile/btimp.sml is the current default plugin
1970       for back-tracing.  It keeps track of the dynamic call stack and in
1971       addition to that it keeps a partial history at each "level" of that
1972       stack.  For example, if a tail-calls b, b tail-calls c, and c tail-calls
1973       d and b (at separate times, dynamically), then the report will show:
1974    
1975       GOTO   d
1976             /c
1977       GOTO  \b
1978       CALL   a
1979    
1980       This shows that there was an initial non-tail call of a, then a
1981       tail-call to b or c, looping behavior in a cluster of functions that
1982       consist of b and c, and then a goto from that cluster (i.e., either from
1983       b or from c) to d.
1984    
1985       Note that (depending on the user program) the amount of information
1986       that the back-trace module has to keep track of at each level is bounded
1987       by a constant.  Thus, the whole implementation has the same asymptotical
1988       complexity as the original program (both in space and in time).
1989    
1990    5. compiler/TopLevel/interact/evalloop.sml has been modified to
1991       handle the special exception SMLofNJ.Internals.BTrace.BTrace
1992       which is raised by the "trigger" function mentioned above.
1993    
1994    Notes on usage:
1995    
1996    - Annotated code works well together with unannotated code:
1997    Unannotated calls simply do not show up at all in the backtrace.
1998    
1999    - It is not a good idea to let modules that were annotated during
2000    different sessions run at the same time.  This is because the compiler
2001    chooses small integers to identify individual functions, and there
2002    will be clashes if different modules were compiled in separate sessions.
2003    (Nothing will crash, and you will even be told about the clashes, but
2004    back-trace information will in general not be useful.)
2005    
2006    - Back-tracing can be confused by callcc and capture.
2007    
2008    - The only way of getting a back-trace right now is to explicitly
2009    invoke the "trigger" function from your user program.  Eventually, we
2010    should make every exception carry back-trace information (if
2011    available).  But since this creates more overhead at "raise"-time
2012    (similar to the current exnHistory overhead), I have not yet
2013    implemented this.  (The implementation will be rather easy.)  With
2014    exceptions carrying back-trace information, this facility will be even
2015    more useful because users don't need to modify their programs...
2016    
2017    - While it is possible to compile the compiler with back-trace
2018    annotations turned on (I did it to get some confidence in
2019    correctness), you must make absolutely sure that core.sml and
2020    btimp.sml are compiled WITHOUT annotation!  (core.sml cannot actually
2021    be compiled with annotation because there is no core access yet, but
2022    if you compile btimp.sml with annotation, then the system will go into
2023    an infinite recursion and crash.)
2024    Since CM currently does not know about BTrace, the only way to turn
2025    annotations on and off for different modules of the compiler is to
2026    interrupt CMB.make, change the settings, and re-invoke it.  Of course,
2027    this is awkward and clumsy.
2028    
2029    Sample sessions:
2030    
2031    Standard ML of New Jersey v110.28.1 [FLINT v1.5], June 5, 2000
2032    - SMLofNJ.Internals.BTrace.mode (SOME true);
2033    [autoloading]
2034    [autoloading done]
2035    val it = false : bool
2036    - structure X = struct
2037    -     fun main n = let
2038    -         fun a (x, 0) = d x
2039    -           | a (x, n) = b (x, n - 1)
2040    -         and b (x, n) = c (x, n)
2041    -         and c (x, n) = a (x, n)
2042    -         and d x = e (x, 3)
2043    -         and e (x, 0) = f x
2044    -           | e (x, n) = e (x, n - 1)
2045    -         and f 0 = SMLofNJ.Internals.BTrace.trigger ()
2046    -           | f n = n * g (n - 1)
2047    -         and g n = a (n, 3)
2048    -     in
2049    -         f n
2050    -     end
2051    - end;
2052    structure X : sig val main : int -> int end
2053    - X.main 3;
2054    *** BACK-TRACE ***
2055    GOTO   stdIn:4.2-13.20: X.main[2].f
2056    GOTO-( stdIn:4.2-13.20: X.main[2].e
2057    GOTO   stdIn:4.2-13.20: X.main[2].d
2058         / stdIn:4.2-13.20: X.main[2].a
2059         | stdIn:4.2-13.20: X.main[2].b
2060    GOTO-\ stdIn:4.2-13.20: X.main[2].c
2061    CALL   stdIn:4.2-13.20: X.main[2].g
2062    GOTO   stdIn:4.2-13.20: X.main[2].f
2063    GOTO-( stdIn:4.2-13.20: X.main[2].e
2064    GOTO   stdIn:4.2-13.20: X.main[2].d
2065         / stdIn:4.2-13.20: X.main[2].a
2066         | stdIn:4.2-13.20: X.main[2].b
2067    GOTO-\ stdIn:4.2-13.20: X.main[2].c
2068    CALL   stdIn:4.2-13.20: X.main[2].g
2069    GOTO   stdIn:4.2-13.20: X.main[2].f
2070    GOTO-( stdIn:4.2-13.20: X.main[2].e
2071    GOTO   stdIn:4.2-13.20: X.main[2].d
2072         / stdIn:4.2-13.20: X.main[2].a
2073         | stdIn:4.2-13.20: X.main[2].b
2074    GOTO-\ stdIn:4.2-13.20: X.main[2].c
2075    CALL   stdIn:4.2-13.20: X.main[2].g
2076    GOTO   stdIn:4.2-13.20: X.main[2].f
2077    CALL   stdIn:2.15-17.4: X.main[2]
2078    -
2079    
2080    (Note that because of a FLINt bug the above code currently does not
2081    compile without BTrace turned on.)
2082    
2083    Here is another example, using my modified Tiger compiler:
2084    
2085    Standard ML of New Jersey v110.28.1 [FLINT v1.5], June 5, 2000
2086    - SMLofNJ.Internals.BTrace.mode (SOME true);
2087    [autoloading]
2088    [autoloading done]
2089    val it = false : bool
2090    - CM.make "sources.cm";
2091    [autoloading]
2092    ...
2093    [autoloading done]
2094    [scanning sources.cm]
2095    [parsing (sources.cm):parse.sml]
2096    [creating directory CM/SKEL ...]
2097    [parsing (sources.cm):tiger.lex.sml]
2098    ...
2099    [wrote CM/sparc-unix/semant.sml]
2100    [compiling (sources.cm):main.sml]
2101    [wrote CM/sparc-unix/main.sml]
2102    [New bindings added.]
2103    val it = true : bool
2104    - Main.compile ("../testcases/merge.tig", "foo.out");
2105    *** BACK-TRACE ***
2106    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trvar
2107    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
2108    CALL   lib/semant.sml:289.3-295.22: SemantFun[2].transExp.trexp.check[2]
2109    GOTO   lib/semant.sml:289.3-295.22: SemantFun[2].transExp.trexp.check[2]
2110    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
2111    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
2112    CALL   lib/semant.sml:488.3-505.6: SemantFun[2].transDec.trdec[2].transBody[2]
2113         / lib/semant.sml:411.65-543.8: SemantFun[2].transDec
2114    CALL-\ lib/semant.sml:413.2-540.9: SemantFun[2].transDec.trdec[2]
2115    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
2116    CALL   lib/semant.sml:8.52-558.4: SemantFun[2].transProg[2]
2117    CALL   main.sml:1.18-118.4: Main.compile[2]
2118    -
2119    
2120    ----------------------------------------------------------------------
2121    Name: Matthias Blumen
2122    Date: 2000/06/21 18:00:00 JST
2123    Tag: blume-20000621-manual
2124    Description:
2125    
2126    CM manual update: Path environments documented.
2127    
2128    ----------------------------------------------------------------------
2129    Name: Matthias Blume
2130    Date: 2000/06/19 13:40:00
2131    Tag: blume-20000619-manual
2132    Description:
2133    
2134    CM manual and system/README update.  This only covers the fact that
2135    there are no more implicit anchors.  (Path environments and the "bind"
2136    option to "cm" have yet to be documented.)
2137    
2138    ----------------------------------------------------------------------
2139    Name: Matthias Blume
2140    Date: 2000/06/19 11:05:00 JST
2141    Tag: blume-20000619-chdir-bugfix
2142    Description:
2143    
2144    Fixed a bug in new SrcPath module that sometimes led to a bad chDir call.
2145    
2146    ----------------------------------------------------------------------
2147    Name: Matthias Blume
2148    Date: 2000/06/18 22:00:10 JST
2149    Tag: blume-20000618-implicit-anchors-really-gone
2150    Description:
2151    
2152    I updates the previous HISTORY entry where I forgot to mention that
2153    implicit anchors are no longer with us.
2154    
2155    The current update also gets rid of the (now useless) controller
2156    CM.Control.implicit_anchors.
2157    
2158    ----------------------------------------------------------------------
2159    Name: Matthias Blume
2160    Date: 2000/06/16 17:30:00 JST
2161    Tag: blume-20000616-anchorenv
2162    Description:
2163    
2164    This patch implements the long anticipated (just kidding :) "anchor
2165    environment" mechanism.  In the course of doing this, I also
2166    re-implemented CM's internal "SrcPath" module from scratch.  The new
2167    one should be more robust in certain boundary cases.  In any case, it
2168    is a lot cleaner than its predecessor (IMHO).
2169    
2170    This time, although there is yet another boot file format change, I
2171    kept the unpickler backward-compatible.  As a result, no new bootfiles
2172    are necessary and bootstrapping is straightforward.  (You cannot read
2173    new bootfiles into an old system, but the other way around is no
2174    problem.)
2175    
2176    Visible changes:
2177    
2178    ** 0. Implicit path anchors (without the leading $-symbol) are no
2179    longer recognized at all. This means that such path names are not
2180    illegal either.  For example, the name basis.cm simply refers to a
2181    local file called "basis.cm" (i.e, the name is an ordinary path
2182    relative to .cm-files directory).  Or, to put it differently, only
2183    names that start with $ are anchored paths.
2184    
2185    ** 1. The $<singlearc> abbreviation for $/<singlearc> has finally
2186    vanished.
2187    
2188    John (Reppy) had critizised this as soon as I originally proposed and
2189    implemented it, but at that time I did not really deeply believe
2190    him. :) Now I came full-circle because I need the $<singlearc> syntax
2191    in another place where it cannot be seen as an abbreviation for
2192    $/<singlearc>.  To avoid the confusion, $<singlearc> now means what it
2193    seems to mean (i.e., it "expands" into the corresponding anchor
2194    value).
2195    
2196    However, when paths are used as members in CM description files, it
2197    continues to be true that there must be at least another arc after the
2198    anchor.  This is now enforced separately during semantic analysis
2199    (i.e., from a lexical/syntactical point of view, the notation is ok.)
2200    
2201    ** 2. The "cm" class now accepts an option "bind".  The option's value
2202    is a sub-option list of precisely two items -- one labeled "anchor"
2203    and the other one labeled "value".  As you might expect, "anchor" is
2204    used to specify an anchor name to be bound, and "value" specifies what
2205    the anchor is being bound to.
2206    
2207    The value must be a directory name and can be given in either standard
2208    syntax (including the possibility that it is itself an anchored path)
2209    or native syntax.
2210    
2211    Examples:
2212    
2213       foo.cm (bind:(anchor:bar value:$mystuff/bar))
2214       lib.cm (bind:(anchor:a value:"H:\\x\\y\\z"))  (* only works under windows *)
2215    
2216    and so on.
2217    
2218    The meaning of this is that the .cm-file will be processed with an
2219    augmented anchor environment where the given anchor(s) is/are bound to
2220    the given values(s).
2221    
2222    The rationale for having this feature is this: Suppose you are trying
2223    to use two different (already stable) libraries a.cm and b.cm (that
2224    you perhaps didn't write yourself).  Further, suppose each of these
2225    two libraries internally uses its own auxiliary library $aux/lib.cm.
2226    Normally you would now have a problem because the anchor "lib" can not
2227    be bound to more than one value globally.  Therefore, the project that
2228    uses both a.cm and b.cm must locally redirect the anchor to some other
2229    place:
2230    
2231       a.cm (bind:(anchor:lib value:/usr/lib/smlnj/a-stuff))
2232       b.cm (bind:(anchor:lib value:/usr/lib/smlnj/b-stuff))
2233    
2234    This hard-wires $lib/aux.cm to /usr/lib/smlnj/a-stuff/aux.cm or
2235    /usr/lib/smlnj/b-stuff/aux.cm, respectively.
2236    
2237    Hard-wiring path names is a bit inflexible (and CM will verbosely warn
2238    you when you do so at the time of CM.stabilize).  Therefore, you can
2239    also use an anchored path as the value:
2240    
2241      a.cm (bind:(anchor:lib value:$a-lib))
2242      b.cm (bind:(anchor:lib value:$b-lib))
2243    
2244    Now you can globally configure (using the usual CM.Anchor.anchor or
2245    pathconfig machinery) bindings for "a-lib" and "b-lib".  Since "lib"
2246    itself is always locally bound, setting it globally is no longer
2247    meaningful or necessary (but it does not hurt either).  In fact, "lib"
2248    can still be used as a global anchor for separate purposes.  As a
2249    matter of fact, one can locally define "lib" in terms of a global
2250    "lib":
2251    
2252      a.cm (bind:(anchor:lib value:$lib/a))
2253      b.cm (bind:(anchor:lib value:$lib/b))
2254    
2255    ** 3: The encoding of path names has changed.  This affects the way
2256    path names are shown in CM's progress report and also the internal
2257    protocol encoding used for parallel make.
2258    
2259    The encoding now uses one or more ':'-separated segments.  Each
2260    segments corresponds to a file that has been specified relative to the
2261    file given by its preceding segment.  The first segment is either
2262    relative to the CWD, absolute, or anchored.  Each segment itself is
2263    basically a Unix pathname; all segments but the first are relative.
2264    
2265    Example:
2266    
2267       $foo/bar/baz.cm:a/b/c.sml
2268    
2269    This path denotes the file bar/a/b/c.sml relative to the directory
2270    denoted by anchor "foo".  Notice that the encoding also includes
2271    baz.cm which is the .cm-file that listed a/b/c.sml.  As usual, such
2272    paths are resolved relative to the .cm-files directory, so baz.cm must
2273    be ignored to get the "real" pathname.
2274    
2275    To make this fact more obvious, CM puts the names of such "virtual
2276    arcs" into parentheses when they appear in progress reports. (No
2277    parentheses will appear in the internal protocol encoding.)  Thus,
2278    what you really see is:
2279    
2280      $foo/bar/(baz.cm):a/b/c.sml
2281    
2282    I find this notation to be much more informative than before.
2283    
2284    Another new feature of the encoding is that special characters
2285    including parentheses, colons, (back)slashes, and white space are
2286    written as \ddd (where ddd is the decimal encoding of the character).
2287    
2288    *** The CM manual still needs to be updated.
2289    
2290    ----------------------------------------------------------------------
2291    Name: Allen Leung
2292    Date: 2000/06/15 00:38:00
2293    Tag: leunga-20000615-x86-peephole
2294    
2295    x86 Peephole fix by Fermin.  Affects c-- and moby only.
2296    
2297    ----------------------------------------------------------------------
2298    Name: Matthias Blume
2299    Date: 2000/06/12 11:40:00
2300    Tag: blume-20000612-parmakefix
2301    Description:
2302    
2303    More cleanup after changing the file naming scheme: This time I
2304    repaired the parallel make mechanism for CMB.make which I broke earlier.
2305    
2306    ----------------------------------------------------------------------
2307    Name: Allen Leung
2308    Date: 2000/06/09 01:25:00
2309    Tag: leunga-20000609-various
2310    
2311    None of these things should affect normal SML/NJ operations
2312    
2313    1. Peephole improvements provided by Fermin (c--)
2314    2. New annotation DEFUSE for adding extra dependence (moby)
2315    3. New X86 LOCK instructions (moby)
2316    4. New machine description language for reservation tables (scheduling)
2317    5. Fixes to various optimization/analysis modules (branch chaining, dominator
2318       trees etc.)
2319    6. I've changed the CM files so that they can work with versions
2320       110.0.6, 110.25 and 110.28
2321    
2322    ----------------------------------------------------------------------
2323    Name: Matthias Blume
2324    Date: 2000/06/09 12:40:00
2325    Tag: blume-20000609-log
2326    Description:
2327    
2328    - Removed all(?) remaining RCS Log entries from sources.
2329    
2330    - Fixed bug in ml-yacc and ml-lex sources (use explicit anchors for
2331      anchored paths).
2332    
2333    ----------------------------------------------------------------------
2334    Name: Matthias Blume
2335    Date: 2000/06/07 17:00:00 JST
2336    Tag: blume-20000607-no-implicit-anchors
2337    Description:
2338    
2339    1. This update changes the default setting for
2340    CM.Control.implicit_anchors from true to false.  This means that
2341    implicit anchors are no longer permitted by default.  I also tried to
2342    make sure that nothing else still relies on implicit anchors.
2343    (This is the next step on the schedule towards a CM that does not even
2344    have the notion of implicit anchors anymore.)
2345    
2346    2. More CM manual updates.
2347    
2348    3. I managed to track down and fix the pickling bug I mentioned last
2349    time.  Because of the previously existing workaround, this entails no
2350    immediate practical changes.
2351    
2352    ----------------------------------------------------------------------
2353    Name: Matthias Blume
2354    Date: 2000/06/06 11:15:00 JST
2355    Tag: blume-20000606-lazierpickle
2356    Description:
2357    
2358    !!!! NEW BOOT FILES !!!!
2359    
2360    * The main purpose of this update is to make library pickles lazier in
2361    order to reduce the initial space penalty for autoloading a library.
2362    As a result, it is now possible to have $smlnj/compiler.cm
2363    pre-registered.  This should take care of the many complaints or
2364    inquiries about missing structure Compiler.  This required changes to
2365    CM's internal data structures and small tweaks to some algorithms.
2366    
2367    As a neat additional effect, it is no longer necessary (for the sake
2368    of lean heap image files) to distinguish between a "minimal" CM and a
2369    "full" CM.  Now, there is only one CM (i.e., the "full" version:
2370    $smlnj/cm.cm aka $smlnj/cm/full.cm), and it is always available at the
2371    interactive top level. ($smlnj/cm/minimal.cm is gone.)
2372    
2373    To make the life of compiler-hackers easier, "makeml" now also
2374    pre-registers $smlnj/cmb.cm (aka $smlnj/cmb/current.cm).  In other
2375    words, after you bootstrap a new sml for the first time, you will not
2376    have to autoload $smlnj/cmb.cm again afterwards.  (The first time
2377    around you will still have to do it, though.)
2378    
2379    * A second change consists of major updates to the CM manual.  There
2380    are now several appendices with summary information and also a full
2381    specification of the CM description file syntax.
2382    
2383    * In directory src/system I added the script "allcross".  This script
2384    invokes sml and cross-compiles the compiler for all supported
2385    architectures.  (Useful when providing a new set of boot files.)
2386    
2387    * There seems to be a latent bug in my "lazy pickles" mechanism.  I
2388    added a small tweak to pickle-util.sml to work around this problem,
2389    but it is not a proper fix yet.  I will investigate further.  (The
2390    effect of the bug was an inflation of library pickle size.)
2391    
2392    * Version number increased to 110.28.1 (to avoid compatibility problems).
2393    
2394    ----------------------------------------------------------------------
2395    Name: Allen Leung
2396    Date: 2000/05/25 17:28 EDT
2397    Tag: leunga-20000525-ra
2398    Description:
2399    
2400      Fixed a bug in freezing phase of the register allocator.
2401    
2402    ----------------------------------------------------------------------
2403    Name: Allen Leung
2404    Date: 2000/05/15 22:53 EDT
2405    Tag: leunga-20000515-alpha-x86-ra
2406    Description:
2407    
2408      1. Alpha
2409    
2410          Slight cleanup.  Removed the instruction SGNXL
2411    
2412      2. X86
2413    
2414          Added the following instructions to the instruction set:
2415    
2416            ROLx, RORx,
2417            BTx, BTSx, BTLx, BTRx,
2418            XCHGx, and variants with the LOCK prefix
2419    
2420      3. Register Allocation
2421    
2422          The module ra-rewrite-with-renaming has been improved.
2423    
2424      These have no effect on SML/NJ.
2425    
2426    ----------------------------------------------------------------------
2427    Name: Matthias Blume
2428    Date: 2000/05/15 16:20:00 JST
2429    Tag: blume-20000515-lightrebuild
2430    Description:
2431    
2432    1. I added an alternative to "-rebuild" to "makeml".  The difference is
2433       that prior to calling CMB.make' the CM-variable "LIGHT" will be
2434       defined.  In effect, the command will not build any cross-compiler
2435       backends and therefore finish more quickly.
2436    
2437       The "fixpt" script also takes a "-light" switch to be able to use
2438       this new facility while compiling for a fixpoint.
2439    
2440    2. I replaced all mentions of anchored paths in group owner specifications
2441       with simple relative paths (usually starting with "..").
2442       The rationale is that a library's internal workings should not be
2443       compromised by the lack of some anchor.  (An anchor is necessary
2444       for someone who wants to refer to the library by an anchored path,
2445       but it should not be necessary to build the same library in the first
2446       place.)
2447    
2448    3. I changed the way CM's tool mechanism determines the shell command
2449       string used for things like ml-yacc etc. so that it does not break
2450       when CM.Control.implicit_anchors is turned off.
2451    
2452    ----------------------------------------------------------------------
2453    Name: Matthias Blume
2454    Date: 2000/05/12 18:20:00 JST
2455    Tag: blume-20000512-ml-build
2456    Description:
2457    
2458    Fixed a bug in config/_ml-build that prevented ml-yacc and ml-lex from
2459    getting installed properly (by config/install.sh).
2460    
2461    ----------------------------------------------------------------------
2462    Name: Matthias Blume
2463    Date: 2000/05/12 17:30:00 JST
2464    Tag: blume-20000512-anchors
2465    Description:
2466    
2467    !!! NEW BOOT FILES !!!
2468    
2469    This change is in preparation of fading out support for "implicitly
2470    anchored path names".  I went through all sources and used the
2471    explicit (and relatively new) $-notation.  See system/README and the
2472    CM manual for more info on this.
2473    
2474    I also modified the anchoring scheme for some things such as "smlnj",
2475    "MLRISC", "cm", etc. to take advantage of the fact that explicit
2476    anchors are more expressive: anchor name and first arc do not have to
2477    coincide.  This entails the following user-visible change:
2478    
2479    You have to write $smlnj/foo/bar instead of smlnj/foo/bar.  In
2480    particular, when you fire up sml with a command-line argument, say,
2481    e.g.:
2482    
2483       sml '$smlnj/cmb.cm'
2484    
2485    At the ML toplevel prompt:
2486    
2487       CM.autoload "$smlnj/cmb.cm";
2488    
2489    There is also a new controller in CM.Control that can be used to turn
2490    off all remaining support for implicit anchors by saying:
2491    
2492        CM.autoload "$smlnj/
2493        #set CM.Control.implicit_anchors false;
2494    
2495    This causes CM to reject implicitly anchored paths.  This is (for the
2496    time being) less permissive than the "final" version where there will
2497    be no more such implicit anchors and relative paths will be just that:
2498    relative.
2499    
2500    The next step (version after next version?) will be to make the
2501    default for CM.Control.implicit_anchors false.  After the dust has
2502    settled, I can then produce the "final" version of this...
2503    
2504    Note: Since bootstrapping is a bit tricky, I provided new boot files.
2505    
2506    ----------------------------------------------------------------------
2507    Name: Matthias Blume
2508    Date: 2000/05/11 16:30:00 JST
2509    Tag: blume-20000511-sources
2510    Description:
2511    
2512    The main change is that I added function CM.sources as a generalized
2513    version of the earlier CM.makedepend.  This entails the following
2514    additional changes:
2515    
2516      - CM.makedepend has been dropped.
2517    
2518      - CM manual has been updated.
2519    
2520      - TOOLS signature and API have been changed.
2521    
2522    ----------------------------------------------------------------------
2523    Name: Allen Leung
2524    Date: 2000/05/10 21:17 EDT
2525    Tag: leunga-20000510-moby-c--ssa
2526    Description:
2527    
2528      Various bug fixes and new features for C--, Moby and MLRISC optimizations.
2529    None of these affect SML/NJ.
2530    
2531    1. Register Allocation
2532    
2533        a. A new ra spilling module (ra/ra-spill-with-renaming) is implemented.
2534           This module tries to remove local (i.e. basic block level) redundancies
2535           during spilling.
2536    
2537        b. A new framework for performing region based register allocation.
2538           Not yet entirely functional.
2539    
2540    2. X86
2541    
2542       a. DefUse for POP was missing the stack pointer [found by Lal]
2543       b. Reload for CALL was incorrect in X86Spill [found by John]
2544       c. Various fixes in X86Spill so that it can be used correctly for
2545          the new spilling module.
2546    
2547    3. SSA/IR
2548    
2549       a. New module ir/dj-dataflow.sml implements elimination based
2550          data flow analysis.
2551    
2552    4. MLRiscGen
2553    
2554       a. Fix for gc type annotation
2555    
2556    5. MDGen
2557    
2558       Various fixes for machine description -> ml code translation.  For ssa
2559       only.
2560    
2561    ----------------------------------------------------------------------
2562    Name: Allen Leung
2563    Date: 2000/05/08 22:17 EDT
2564    Tag: leunga-20000508-labexp
2565    Description:
2566    
2567      Fermin has found a few assembly problems with constant expressions
2568      generated in LabelExp.  Mostly, the problems involve extra parentheses,
2569      which choke on dumb assemblers.  This is his fix.
2570    
2571    ----------------------------------------------------------------------
2572    Name: Dave MacQueen
2573    Date: 2000/04/09 14:00 EDT
2574    Tag: dbm-20000502-Version_110_28
2575    Description:
2576    
2577    1. Updated src/compiler/TopLevel/main/version.sml to version 110.28
2578    
2579    2. Updated config/version to 110.28
2580    
2581    3. Updated config/srcarchiveurl
2582    
2583    3. New boot files!
2584       ftp://ftp.research.bell-labs.com/dist/smlnj/working/110.28/
2585    
2586    ----------------------------------------------------------------------
2587    Name: Matthias Blume
2588    Date: 2000/05/01 19:05:00 JST
2589    Tag: blume-20000501-noweb
2590    Description:
2591    
2592    A new noweb tool has been added.  The existing system is entirely
2593    unaffected by this, but some CM users have asked for renewed noweb
2594    support.  Everything is documented in the CM manual.
2595    
2596    New (plugin) libraries:
2597    
2598       noweb-tool.cm
2599       nw-ext.cm
2600    
2601    ----------------------------------------------------------------------
2602    Name: Dave MacQueen
2603    Date: 2000/04/30 12:40PM EDT
2604    Tag: dbm-20000430-bug_fixes
2605    Description:
2606    
2607    1. Fix for bug 1498
2608       smlnj/src/system/Basis/Implementation/Unsafe/object.sig
2609       smlnj/src/system/Basis/Implementation/Unsafe/object.sml
2610         added toRealArray function
2611       smlnj/src/compiler/MiscUtil/print/ppobj.sml
2612         added check for tag Obj.RealArray to array printing case in ppObj
2613    
2614    2. Fix for bug 1510
2615       smlnj/src/compiler/Semant/types/typesutil.sml
2616         fixed definition of dummyargs (used by equalTycon) so that
2617         dummy args are distinct types
2618    
2619    ----------------------------------------------------------------------
2620    Name: Matthias Blume
2621    Date: 2000/04/30 01:00:00 JST
2622    Tag: blume-20000430-versions
2623    Description:
2624    
2625    1. CM version numbering added.  This is an implementation of Lal's
2626       proposal for adding version numbers and version checking to .cm
2627       files.  Lal said that his proposal was just that -- a proposal.
2628       For the time being I went ahead and implemented it so that people
2629       can comment on it.  Everything is completely backward-compatible
2630       (except for the stable library format, i.e., new bootfiles!).
2631    
2632       As usual, see the CM manual for details.
2633    
2634    2. An alternative syntax for anchored paths has been implemented.
2635       Dave has recently voiced the same concerns that I had when I did
2636       this, so there should be some support.  My take is that eventually
2637       I will let support for the current syntax (where anchors are
2638       "implicit") fade out in favor of the new, explicit syntax.
2639       In order to be backward-compatible, both old and new syntax are
2640       currently supported.
2641    
2642       Again, see the CM manual for details.
2643    
2644    3. Parallel make is trying to be slightly smarter:  When the master
2645       process finds a "bottleneck", i.e., when there is only one
2646       compilation unit that can be compiled and everybody else is
2647       waiting on it, then it will simply compile it directly instead
2648       of clumsily telling one of the slaves to do it.
2649    
2650    4. Support for "unsharing" added.  This is necessary in order to be
2651       able to have two different versions of the same library running
2652       at the same time (e.g., for trying out a new MLRISC while still
2653       having the old MLRISC linked into the current compiler, etc.)
2654       See the CM manual.
2655    
2656    5. Simple "makedepend" functionality added for generating Makefile
2657       dependency information.  (This is rather crude at the moment.
2658       Expect some changes here in the future.)
2659    
2660    6. ".fun" added as a recognized suffix for ML files. Also documented
2661       explicitly in the manual that the fallback behavior (unknown suffix
2662       -> ML file) is not an official feature!
2663    
2664    7. Small changes to the pickler for stable libraries.
2665    
2666    8. Several internal changes to CM (for cleanup/improvement).
2667    
2668    
2669    !!!! NEW BINFILES !!!!
2670    
2671    ----------------------------------------------------------------------
2672    Name: Matthias Blume
2673    Date: 2000/04/28 17:30:00 JST
2674    Tag: blume-20000428-pathconfig
2675    Description:
2676    
2677    1. I changed config/install.sh to remove duplicate entries from the
2678       lib/pathconfig file at the end.  Moreover, the final version of
2679       lib/pathconfig is sorted alphabetically.  The same (sorting) is done
2680       in src/system/installml.
2681    
2682    2. The config/install.sh script now consistently uses relative
2683       pathnames in lib/pathconfig whenever the anchor is in the lib
2684       directory.  (So far this was true for the libraries that come
2685       pre-compiled and bundled as part of the bootfiles but not for
2686       libraries that are compiled by the script itself.)
2687    
2688    ----------------------------------------------------------------------
2689    Name: Matthias Blume
2690    Date: 2000/04/26 13:10:00 JST
2691    Tag: blume-20000426-fun_suffix
2692    Description:
2693    
2694    Added ".fun" as a recognized file name suffix (for ML code).
2695    
2696    ----------------------------------------------------------------------
2697    Name: Allen Leung
2698    Date: 2000/04/25 17:00:00 EST
2699    Tag: leunga-20000425-alpha-ra
2700    Description:
2701    
2702    1. Alpha
2703    
2704        PSEUDOARITH was missing in AlphaRewrite.  This causes an endless loop
2705    in C--.
2706    
2707    2. RA
2708    
2709       Added a flag "ra-dump-size" to print out the size of the flowgraph
2710       and the interference graph.
2711    
2712    ----------------------------------------------------------------------
2713    Name: Dave MacQueen
2714    Date: 2000/04/25/
2715    Tag: dbm-20000425-mlyacc_doc_examples
2716    Description:
2717      Updated mlyacc.tex sections 5 and 7 for SML '97 and CM.
2718      Updated all three examples in src/ml-yacc/examples to run
2719      under 110.* using CM.make.
2720    
2721    ----------------------------------------------------------------------
2722    Name: Allen Leung
2723    Date: 2000/04/20 23:04:00 EST
2724    Tag: leunga-20000420-ssa-c---stuff
2725    Description:
2726    
2727      This update synchronizes my repository with Yale's.  Most of these
2728    changes, however, do not affect SML/NJ at all (the RA is an exception).
2729    
2730    1. Register Allocator
2731    
2732       a. An improvement in the interference graph construction:
2733          Given a copy
2734    
2735                s <- t
2736    
2737          no interference edge between s and t is added for this definition of s.
2738    
2739       b. I've added two new spill heuristic modules that Fermin and I developed
2740          (in the new library RA.cm). These are unused in SML/NJ but maybe
2741          useful for others (Moby?)
2742    
2743    2. X86
2744    
2745       a. Various fixes in the backend provided by Fermin [C--] and Lal.
2746    
2747    3. Alpha
2748    
2749       a. Added the BSR instruction and code generation that goes with it [C--]
2750       b. Other fixes too numerous to recount provided by Fermin [C--]
2751    
2752    4. Regmaps
2753    
2754       a. The regmaps are not initialized with the identity physical bindings
2755          at creation time.  This is unneeded.
2756    
2757    5. MLRISC Optimizations
2758    
2759       a. The DJ-Graph module can now compute the iterated dominance frontiers
2760          intersects with liveness incrementally in linear time! Woohoo!
2761          This is now used in my new SSA construction algorithm.
2762    
2763       b. THe branch reorganization module is now smarter about linear chains of
2764          basic blocks.
2765    
2766    
2767    ----------------------------------------------------------------------
2768    Name: Matthias Blume
2769    Date: 2000/04/12 13:52:00 JST
2770    Tag: blume_main_v110p27_1
2771    Description:
2772    
2773    Changed install.sh script to handle archive files without version number
2774    and to use "boot.<arch>-<os>" instead of "sml.boot.<arch>-<os>" for the
2775    name of the boot file archive.
2776    
2777  ----------------------------------------------------------------------  ----------------------------------------------------------------------
2778  Name: Dave MacQueen  Name: Dave MacQueen
2779  Date: 2000/04/09 14:00 EDT  Date: 2000/04/09 14:00 EDT
# Line 119  Line 2882 
2882    
2883  3.  Assembly  3.  Assembly
2884    
2885      When generating assemby, resolve the value of client defined constants,      When generating assembly, resolve the value of client defined constants,
2886      instead of generating symbolic values.  This is controlled by the      instead of generating symbolic values.  This is controlled by the
2887      new flag "asm-resolve-constants", which is default to true.      new flag "asm-resolve-constants", which is default to true.
2888    
# Line 142  Line 2905 
2905    
2906  To this end, I arranged that instead of "structure Core" as "structure  To this end, I arranged that instead of "structure Core" as "structure
2907  _Core" is bound in the pervasive environment.  Core access is done via  _Core" is bound in the pervasive environment.  Core access is done via
2908  _Core (which can never be accidentially rebound because _Core is not a  _Core (which can never be accidentally rebound because _Core is not a
2909  legal surface-syntax symbol).  legal surface-syntax symbol).
2910    
2911  The current solution is much cleaner because the core environment is  The current solution is much cleaner because the core environment is
# Line 152  Line 2915 
2915  with dynamic and symbolic parts of the core environment.  with dynamic and symbolic parts of the core environment.
2916    
2917  Remaining hackery (to bind the "magic" symbol _Core) is localized in the  Remaining hackery (to bind the "magic" symbol _Core) is localized in the
2918  compilation mananger's bootstrap compiler (actually: in the "init group"  compilation manager's bootstrap compiler (actually: in the "init group"
2919  handling).  See the comments in src/system/smlnj/init/init.cmi for  handling).  See the comments in src/system/smlnj/init/init.cmi for
2920  more details.  more details.
2921    
# Line 267  Line 3030 
3030     (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
3031     used).     used).
3032    
3033     This was done to accomodate the new "make" and "shell" tools which     This was done to accommodate the new "make" and "shell" tools which
3034     facilitate fairly seemless hookup to portions of code managed using     facilitate fairly seamless hookup to portions of code managed using
3035     Makefiles or Shell scripts.     Makefiles or Shell scripts.
3036    
3037     There are no classes "shared" or "private" anymore.  Instead, the     There are no classes "shared" or "private" anymore.  Instead, the
# Line 280  Line 3043 
3043    
3044     All existing tools are described in the CM manual.     All existing tools are described in the CM manual.
3045    
3046     - Slightly better error handling.  (CM now surpresses many followup     - Slightly better error handling.  (CM now suppresses many followup
3047     error messages that tended to be more annoying than helpful.)     error messages that tended to be more annoying than helpful.)
3048    
3049  2. Major changes to the compiler's static environment data structures.  2. Major changes to the compiler's static environment data structures.
# Line 311  Line 3074 
3074       elaborator). There were a lot of changes during my "linkpath" trials       elaborator). There were a lot of changes during my "linkpath" trials
3075       that could have been reverted to their original state but weren't.       that could have been reverted to their original state but weren't.
3076       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
3077       than what was strictly necessary...  (I _did_ resist the tempation       than what was strictly necessary...  (I _did_ resist the temptation
3078       of doing any "global reformatting" to avoid an untimely death at       of doing any "global reformatting" to avoid an untimely death at
3079       Dave's hands. :)       Dave's hands. :)
3080    
# Line 414  Line 3177 
3177    
3178       I've changed andl to testl in the floating point test sequence       I've changed andl to testl in the floating point test sequence
3179       whenever appropriate.  The Intel optimization guide states that       whenever appropriate.  The Intel optimization guide states that
3180       testl is perferable to andl.       testl is preferable to andl.
3181    
3182  7. RA (x86 only)  7. RA (x86 only)
3183    
# Line 596  Line 3359 
3359    
3360  1. Tools.registerStdShellCmdTool (from smlnj/cm/tool.cm) takes an  1. Tools.registerStdShellCmdTool (from smlnj/cm/tool.cm) takes an
3361  additional argument called "template" which is an optional string that  additional argument called "template" which is an optional string that
3362  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
3363  explanation.  explanation.
3364    
3365  2. A special-purpose tool can be "regisitered" by simply dropping the  2. A special-purpose tool can be "registered" by simply dropping the
3366  corresponding <...>-tool.cm (and/or <...>-ext.cm) into the same  corresponding <...>-tool.cm (and/or <...>-ext.cm) into the same
3367  directory where the .cm file lives that uses this tool.  (The  directory where the .cm file lives that uses this tool.  (The
3368  behavior/misfeature until now was to look for the tool description  behavior/misfeature until now was to look for the tool description
# Line 643  Line 3406 
3406  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
3407  <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,
3408  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
3409  perhaps got accidentially killed).  In this case, fixpt will quickly  perhaps got accidentally killed).  In this case, fixpt will quickly
3410  move through what exists before continuing where it left off earlier,  move through what exists before continuing where it left off earlier,
3411  and, thus, saves a lot of time.  and, thus, saves a lot of time.
3412    
# Line 693  Line 3456 
3456    it from that remote directory.    it from that remote directory.
3457    This should simplify installation further:  For machines that have    This should simplify installation further:  For machines that have
3458    access to the internet, just fetch <version>-config.tgz, unpack it,    access to the internet, just fetch <version>-config.tgz, unpack it,
3459    edit config/targets, and go (run config/install.sh).  The scipt will    edit config/targets, and go (run config/install.sh).  The script will
3460    fetch everything else that it might need all by itself.    fetch everything else that it might need all by itself.
3461    
3462    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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