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revision 836, Fri May 25 19:28:51 2001 UTC revision 918, Mon Aug 27 15:18:01 2001 UTC
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14    
15  ----------------------------------------------------------------------  ----------------------------------------------------------------------
16  Name: Matthias Blume  Name: Matthias Blume
17    Date: 2001/08/27 11:20:00 EDT
18    Tag: blume-20010827-readme11035
19    Description:
20    
21    Fleshed out the README file for 110.35.
22    
23    ----------------------------------------------------------------------
24    Name: Matthias Blume
25    Date: 2001/08/24 17:10:00 EDT
26    Tag: Release_110_35
27    Description:
28    
29    New version number (110.35).  New bootfiles.
30    
31    ----------------------------------------------------------------------
32    Name: Lal George
33    Date: 2001/08/24 13:47:18 EDT 2001
34    Tag: george-20010824-MLRISC-graphs
35    Description:
36    
37     removed clusters from MLRISC completely and replaced with graphs.
38    
39    ----------------------------------------------------------------------
40    Name: Matthias Blume
41    Date: 2001/08/23 17:50:00 EDT
42    Tag: blume-20010823-toplevel
43    Description:
44    
45    - some reorganization of the code that implements various kinds of
46      environments in the compiler (static, dynamic, symbolic, combined)
47    - re-implemented the EnvRef module so that evalStream works properly
48      (if the stream contains references to "use", "CM.make", etc.)
49    - cleaned up evalloop.sml and interact.sml (but they need more cleaning)
50    
51    ----------------------------------------------------------------------
52    Name: Matthias Blume
53    Date: 2001/08/20 15:50 EDT
54    Tag: blume20010820-slipup
55    Description:
56    
57    I forgot to commit a few files.  Here they are...
58    
59    ----------------------------------------------------------------------
60    Name: Matthias Blume
61    Date: 2001/08/20 15:35:00 EDT
62    Tag: blume-20010820-debugprof
63    Description:
64    
65    !!!! NEW BOOTFILES !!!!
66    
67    This is another round of reorganizing the compiler sources.  This
68    time the main goal was to factor out all the "instrumentation"
69    passes (for profiling and backtracing) into their own library.
70    The difficulty was to do it in such a way that it does not depend
71    on elaborate.cm but only on elabdata.cm.
72    
73    Therefore there have been further changes to both elaborate.cm and
74    elabdata.cm -- more "generic" things have been moved from the former
75    to the latter.  As a result, I was forced to split the assignment
76    of numbers indicating "primtyc"s into two portions: SML-generic and
77    SML/NJ-specific.  Since it would have been awkward to maintain,
78    I bit the bullet and actually _changed_ the mapping between these
79    numbers and primtycs.  The bottom line of this is that you need
80    a new set of bin- and bootfiles.
81    
82    I have built new bootfiles for all architectures, so doing a fresh
83    checkout and config/install.sh should be all you need.
84    
85    The newly created library's name is
86    
87        $smlnj/viscomp/debugprof.cm
88    
89    and its sources live under
90    
91        src/compiler/DebugProf
92    
93    ----------------------------------------------------------------------
94    Name: Matthias Blume
95    Date: 2001/08/15 17:15:00 EDT
96    Tag: blume-20010815-compreorg
97    Description:
98    
99    This is a first cut at reorganizing the CM libraries that make up the
100    core of the compiler.  The idea is to separate out pieces that could
101    be used independently by tools, e.g., the parser, the typechecker, etc.
102    
103    The current status is a step in this direction, but it is not quite
104    satisfactory yet.  Expect more changes in the future.
105    
106    Here is the current (new) organization...
107    
108        What used to be $smlnj/viscomp/core.cm is now divided into
109        six CM libraries:
110    
111             $smlnj/viscomp/basics.cm
112                           /parser.cm
113                           /elabdata.cm
114                           /elaborate.cm
115                           /execute.cm
116                           /core.cm
117    
118        The CM files for these libraries live under src/system/smlnj/viscomp.
119        All these libraries are proxy libraries that contain precisely
120        one CM library component.  Here are the locations of the components
121        (all within the src/compiler tree):
122    
123             Basics/basics.cm
124             Parse/parser.cm
125             ElabData/elabdata.cm
126             Elaborator/elaborate.cm
127             Execution/execute.cm
128             core.cm
129    
130         [This organization is the same that has been used already
131         for a while for the architecture-specific parts of the visible
132         compiler and for the old version of core.cm.]
133    
134         As you will notice, many source files have been moved from their
135         respective original locations to a new home in one of the above
136         subtrees.
137    
138         The division of labor between the new libraries is the following:
139    
140             basics.cm:
141                - Simple, basic definitions that pertain to many (or all) of
142                  the other libraries.
143             parser.cm:
144                - The SML parser, producing output of type Ast.dec.
145                - The type family for Ast is also defined and exported here.
146             elabdata.cm:
147                - The datatypes that describe input and output of the elaborator.
148                  This includes types, absyn, and static environments.
149             elaborator.cm:
150                - The SML/NJ type checker and elaborator.
151                  This maps an Ast.dec (with a given static environment) to
152                  an Absyn.dec (with a new static environment).
153                - This libraries implements certain modules that used to be
154                  structures as functors (to remove dependencies on FLINT).
155             execute.cm:
156                - Everything having to do with executing binary code objects.
157                - Dynamic environments.
158             core.cm:
159                - SML/NJ-specific instantiations of the elaborator and MLRISC.
160                - Top-level modules.
161                - FLINT (this should eventually become its own library)
162    
163    Notes:
164    
165    I am not 100% happy with the way I separated the elaborator (and its
166    data structures) from FLINT.  Two instances of the same problem:
167    
168        1. Data structures contain certain fields that carry FLINT-specific
169           information.  I hacked around this using exn and the property list
170           module from smlnj-lib.  But the fact that there are middle-end
171           specific fields around at all is a bit annoying.
172    
173        2. The elaborator calculates certain FLINT-related information.  I tried
174           to make this as abstract as I could using functorization, but, again,
175           the fact that the elaborator has to perform calculations on behalf
176           of the middle-end at all is not nice.
177    
178        3. Having to used exn and property lists is unfortunate because it
179           weakens type checking.  The other alternative (parameterizing
180           nearly *everything*) is not appealing, though.
181    
182    I removed the "rebinding =" warning hack because due to the new organization
183    it was awkward to maintain it.  As a result, the compiler now issues some of
184    these warnings when compiling init.cmi during bootstrap compilation. On
185    the plus side, you also get a warning when you do, for example:
186       val op = = Int32.+
187    which was not the case up to now.
188    
189    I placed "assign" and "deref" into the _Core structure so that the
190    code that deals with the "lazy" keyword can find them there.  This
191    removes the need for having access to the primitive environment
192    during elaboration.
193    
194    ----------------------------------------------------------------------
195    Name: Matthias Blume
196    Date: 2001/08/13
197    Tag: blume-20010813-closures
198    Description:
199    
200    This fix was sent to us by Zhong Shao.  It is supposed to improve the
201    performance of certain loops by avoiding needless closure allocation.
202    
203    ----------------------------------------------------------------------
204    Name: Lal George
205    Date: 2001/07/31 10:03:23 EDT 2001
206    Tag: george-20010731-x86-fmalloc
207    Description: Fixed bug in x86 calls
208    
209        There was a bug where call instructions would mysteriously
210        vanish. The call instruction had to be one that returned
211        a floating point value.
212    
213    ----------------------------------------------------------------------
214    Name: Lal George
215    Date: 2001/07/19 16:36:29 EDT 2001
216    Tag: george-20010719-simple-cells
217    Description:
218    
219    I have dramatically simplified the interface for CELLS in MLRISC.
220    
221    In summary, the cells interface is broken up into three parts:
222    
223      1. CellsBasis : CELLS_BASIS
224    
225            CellsBasis is a top level structure and common for all
226            architectures.  it contains the definitions of basic datatypes
227            and utility  functions over these types.
228    
229      2. functor Cells() : CELLS
230    
231            Cells generates an interface for CELLS that incorporates the
232            specific resources on the target architecture, such as the
233            presence of special register classes, their number and size,
234            and various useful substructures.
235    
236      3. <ARCH>CELLS
237    
238            e.g. SparcCells: SPARCCELLS
239    
240            <ARCH>CELLS usually contains additional bindings for special
241            registers  on the architecture, such as:
242    
243                    val r0 : cell           (* register zero *)
244                    val y : cell            (* Y register *)
245                    val psr : cell          (* processor status register *)
246                    ...
247    
248            The structure returned by applying the Cells functor is opened
249            in this interface.
250    
251    The main implication of all this is that the datatypes for cells is
252    split between CellsBasis and CELLS -- a fairly simple change for user
253    code.
254    
255    In the old scheme the CELLS interface had a definitional binding of
256    the form:
257    
258            signature CELLS = sig
259    
260               structure CellsBasis = CellsBasis
261    
262               ...
263    
264            end
265    
266    With all the sharing constraints that goes on in MLRISC, this old
267    design  quickly leads to errors such as:
268    
269            "structure definition spec inside of sharing ... "
270    
271    
272    and appears to require an unacceptable amount of sharing and where
273    constraint hackery.
274    
275    I think this error message (the interaction of definitional specs and
276    sharing) requires more explanation on our web page.
277    
278    ----------------------------------------------------------------------
279    Name: Matthias Blume
280    Date: 2001/07/19 15:00:00 EDT
281    Tag: blume-20010719-libreorg
282    Description:
283    
284    This update puts together a fairly extensive but straightforward change
285    to the way the libraries that implement the interactive system are
286    organized:
287    
288       The biggest change is the elimination of structure Compiler.  As a
289       replacement for this structure, there is now a CM library
290       (known as $smlnj/compiler.cm or $smlnj/compiler/current.cm)
291       that exports all the substructures of the original structure Compiler
292       directly.  So instead of saying Compiler.Foo.bar one now simply
293       says Foo.bar.  (The CM libraries actually export a collection of
294       structures that is richer than the collection of substructures of
295       structure Compiler.)
296    
297       To make the transition smooth, there is a separate library called
298       $smlnj/compiler/compiler.cm which puts together and exports the
299       original structure Compiler (or at least something very close to it).
300    
301       There are five members of the original structure Compiler
302       that are not exported directly but which instead became members
303       of a new structure Backend (described by signature BACKEND).  These are:
304       structure Profile (: PROFILE), structure Compile (: COMPILE), structure
305       Interact (: INTERACT), structure Machine (: MACHINE), and val
306       architecture (: string).
307    
308       Structure Compiler.Version has become structure CompilerVersion.
309    
310       Cross-compilers for alpha32, hppa, ppc, sparc, and x86 are provided
311       by $smlnj/compiler/<arch>.cm where <arch> is alpha32, hppa, ppc, sparc,
312       or x86, respectively.
313       Each of these exports the same frontend structures that
314       $smlnj/compiler.cm exports.  But they do not have a structure Backend
315       and instead export some structure <Arch>Backend where <Arch> is Alpha32,
316       Hppa, PPC, Sparc, or X86, respectively.
317    
318       Library $smlnj/compiler/all.cm exports the union of the exports of
319       $smlnj/compiler/<arch>.cm
320    
321       There are no structures <Arch>Compiler anymore, use
322       $smlnj/compiler/<arch>.cm instead.
323    
324       Library host-compiler-0.cm is gone.  Instead, the internal library
325       that instantiates CM is now called cm0.cm.  Selection of the host
326       compiler (backend) is no longer done here but. (Responsibility for it
327       now lies with $smlnj/compiler/current.cm.  This seems to be more
328       logical.)
329    
330       Many individual files have been moved or renamed.  Some files have
331       been split into multiple files, and some "dead" files have been deleted.
332    
333    Aside from these changes to library organization, there are also changes
334    to the way the code itself is organized:
335    
336       Structure Binfile has been re-implemented in such a way that it no
337       longer needs any knowledge of the compiler.  It exclusively deals
338       with the details of binfile layout.  It no longer invokes the
339       compiler (for the purpose of creating new prospective binfile
340       content), and it no longer has any knowledge of how to interpret
341       pickles.
342    
343       Structure Compile (: COMPILE) has been stripped down to the bare
344       essentials of compilation.  It no longer deals with linking/execution.
345       The interface has been cleaned up considerably.
346    
347       Utility routines for dealing with linking and execution have been
348       moved into their own substructures.
349    
350       (The ultimate goal of these changes is to provide a light-weight
351       binfile loader/linker (at least for, e.g., stable libraries) that
352       does not require CM or the compiler to be present.)
353    
354    CM documentation has been updated to reflect the changes to library
355    organization.
356    
357    ----------------------------------------------------------------------
358    Name: Matthias Blume
359    Date: 2001/07/10 17:30:00 EDT
360    Tag: Release_110_34
361    Description:
362    
363    Minor tweak to 110.34 (re-tagged):
364    
365      - README.html file added to CVS repository
366      - runtime compiles properly under FreeBSD 3.X and 4.X
367    
368    ----------------------------------------------------------------------
369    Name: Matthias Blume
370    Date: 2001/07/10 17:30:00 EDT
371    Tag: Release_110_34
372    Description:
373    
374    New version number (110.34). New bootfiles.
375    
376    ----------------------------------------------------------------------
377    Name: Matthias Blume
378    Date: 2001/07/09 16:00:00 EDT
379    Tag: blume-20010709-more-varargs
380    Description:
381    
382    I changed the handling of varargs in ml-nlffigen again:
383    The ellipsis ... will now simply be ignored (with an accompanying warning).
384    
385    The immediate effect is that you can actually call a varargs function
386    from ML -- but you can't actually supply any arguments beyond the ones
387    specified explicitly.  (For example, you can call printf with its format
388    string, but you cannot pass additional arguments.)
389    
390    This behavior is only marginally more useful than the one before, but
391    it has the advantage that a function or, more importantly, a function
392    type never gets dropped on the floor, thus avoiding follow-up problems with
393    other types that refer to the offending one.
394    
395    ----------------------------------------------------------------------
396    Name: Matthias Blume
397    Date: 2001/07/09 11:25:00 EDT
398    Tag: blume-20010709-varargs
399    Description:
400    
401    1. ckit-lib.cm now exports structure Error
402    2. ml-nlffigen reports occurences of "..." (i.e., varargs function types)
403       with a warning accompanied by a source location.  Moreover, it
404       merely skips the offending function or type and proceeds with the
405       rest of its work.u  As a result, one can safely feed C code containing
406       "..." to ml-nlffigen.
407    3. There are some internal improvements to CM, providing slightly
408       more general string substitutions in the tools subsystem.
409    
410    ----------------------------------------------------------------------
411    Name: Matthias Blume
412    Date: 2001/06/27 15:10:00 EDT
413    Tag: blume-20010627-concur
414    Description:
415    
416    Fixed a small bug in CM's handling of parallel compilation.
417    (You could observe the bug by Control-C-interrupting an ordinary
418    CMB.make or CM.stabilize and then attaching some compile servers.
419    The result was that all of a sudden the previously interrupted
420    compilation would continue on its own.  This was because of
421    an over-optimization: CM did not bother to clean out certain queues
422    when no servers were attached "anyway", resulting in the contents
423    of these queues to grab control when new servers did get attached.)
424    
425    There is also another minor update to the CM manual.
426    
427    ----------------------------------------------------------------------
428    Name: Matthias Blume
429    Date: 2001/06/26 16:15:00 EDT
430    Tag: blume-20010626-cmdoc
431    Description:
432    
433    Minor typo fixed in CM manual (syntax diagram for libraries).
434    
435    ----------------------------------------------------------------------
436    Name: Matthias Blume
437    Date: 2001/06/25 22:55:00 EDT
438    Tag: blume-20010625-x86pc
439    Description:
440    
441    Fixed a nasty bug in the X86 assembly code that caused signal
442    handlers to fail (crash) randomly.
443    
444    ----------------------------------------------------------------------
445    Name: Matthias Blume
446    Date: 2001/06/25 12:05:00 EDT
447    Tag: blume-20010625-nlffigen
448    Description:
449    
450    This update fixes a number of minor bugs in ml-nlffigen as reported by
451    Nick Carter <nbc@andrew.cmu.edu>.
452    
453      1. Silly but ok typedefs of the form "typedef void myvoid;" are now accepted.
454      2. Default names for generated files are now derived from the name of
455         the C file *without its directory*.  In particular, this causes generated
456         files to be placed locally even if the C file is in some system directory.
457      3. Default names for generated signatures and structures are also derived
458         from the C file name without its directory.  This avoids silly things
459         like "structure GL/GL".
460         (Other silly names are still possible because ml-nlffigen does not do
461          a thorough check of whether generated names are legal ML identifiers.
462          When in doubt, use command line arguments to force particular names.)
463    
464    ----------------------------------------------------------------------
465    Name: Matthias Blume
466    Date: 2001/06/21 12:25:00 EDT
467    Tag: blume-20010621-eXene
468    Description:
469    
470    eXene now compiles and (sort of) works again.
471    
472    The library name (for version > 110.33) is $/eXene.cm.
473    
474    I also added an new example in src/eXene/examples/nbody.  See the
475    README file there for details.
476    
477    ----------------------------------------------------------------------
478    Name: Matthias Blume
479    Date: 2001/06/20 16:40:00 EDT
480    Tag: blume-20010620-cml
481    Description:
482    
483    CML now compiles and works again.
484    
485    Libraries (for version > 110.33):
486    
487      $cml/cml.cm            Main CML library.
488      $cml/basis.cm          CML's version of $/basis.cm.
489      $cml/cml-internal.cm   Internal helper library.
490      $cml/core-cml.cm       Internal helper library.
491      $cml-lib/trace-cml.cm  Tracing facility.
492      $cml-lib/smlnj-lib.cm  CML's version of $/smlnj-lib.cm
493    
494    The installer (config/install.sh) has been taught how to properly
495    install this stuff.
496    
497    ----------------------------------------------------------------------
498    Name: Matthias Blume
499    Date: 2001/06/19 17:55:00 EDT
500    Tag: blume-20010619-instantiate
501    Description:
502    
503    This un-breaks the fix for bug 1432.
504    (The bug was originally fixed in 110.9 but I broke it again some
505    time after that.)
506    
507    ----------------------------------------------------------------------
508    Name: Matthias Blume
509    Date: 2001/06/19 17:25:00 EDT
510    Tag: blume-20010619-signals
511    Description:
512    
513    This should (hopefully) fix the long-standing signal handling bug.
514    (The runtime system was constructing a continuation record with an
515    incorrect descriptor which would cause the GC to drop data on the floor...)
516    
517    ----------------------------------------------------------------------
518    Name: Matthias Blume
519    Date: 2001/06/15 15:05:00 EDT
520    Tag: blume-20010615-moresparc
521    Description:
522    
523    Here is a short late-hour update related to Sparc c-calls:
524    
525     -- made handling of double-word arguments a bit smarter
526    
527     -- instruction selection phase tries to collapse certain clumsily
528        constructed ML-Trees; typical example:
529    
530            ADD(ty,ADD(_,e,LI d1),LI d2)  ->  ADD(ty,e,LI(d1+d2))
531    
532        This currently has no further impact on SML/NJ since mlriscGen does
533        not seem to generate such patterns in the first place, and c-calls
534        (which did generate them in the beginning) has meanwhile been fixed
535        so as to avoid them as well.
536    
537    ----------------------------------------------------------------------
538    Name: Matthias Blume
539    Date: 2001/06/15 15:05:00 EDT
540    Tag: blume-20010615-sparc
541    Description:
542    
543    The purpose of this update is to provide an implementation of NLFFI
544    on Sparc machines.
545    
546    Here are the changes in detail:
547    
548       * src/MLRISC/sparc/c-calls/sparc-c-calls.sml is a new file containing
549       the Sparc implementation of the c-calls API.
550       * The Sparc backend of SML/NJ has been modified to uniformely use %fp
551       for accessing the ML frame.  Thus, we have a real frame pointer and
552       can freely modify %sp without need for an omit-frame-ptr phase.
553       The vfp logic in src/compiler/CodeGen/* has been changed to accomodate
554       this case.
555       * ml-nlffigen has been taught to produce code for different architectures
556       and calling conventions.
557       * In a way similar to what was done in the x86 case, the Sparc
558       backend uses its own specific extension to mltree.  (For example,
559       it needs to be able to generate UNIMP instructions which are part
560       of the calling convention.)
561       * ml-nlffi-lib was reorganized to make it more modular (in particular,
562       to make it easier to plug in new machine- and os-dependent parts).
563    
564    There are some other fairly unrelated bug fixes and cleanups as well:
565    
566       * I further hacked the .cm files for MLRISC tools (like MDLGen) so
567       that they properly share their libraries with existing SML/NJ libraries.
568       * I fixed a minor cosmetic bug in CM, supressing certain spurious
569       follow-up error messages.
570       * Updates to CM/CMB documentation.
571    
572    TODO items:
573    
574       * MLRISC should use a different register as its asmTemp on the Sparc.
575         (The current %o2 is a really bad choice because it is part of the
576         calling conventions, so things might interfere in unexpected ways.)
577    
578    ----------------------------------------------------------------------
579    Name: Matthias Blume
580    Date: 2001/06/07
581    Tag: blume-20010607-calls
582    Description:
583    
584    A number of internal changes related to C calls and calling conventions:
585    
586    1. ML-Tree CALL statements now carry a "pops" field.  It indicates the
587       number of bytes popped implicitly (by the callee).  In most cases
588       this field is 0 but on x86/win32 it is some non-zero value.  This
589       is information provided for the benefit of the "omit-frameptr" pass.
590    2. The CALL instruction on the x86 carries a similar "pops" field.
591       The instruction selection phase copies its value from the ML-Tree
592       CALL statement.
593    3. On all other architectures, the instruction selection phase checks
594       whether "pops=0" and complains if not.
595    4. The c-calls implementation for x86 now accepts two calling conventions:
596       "ccall" and "stdcall".  When "ccall" is selected, the caller cleans
597       up after the call and pops is set to 0.  For "stdcall", the caller
598       does nothing, leaving the cleanup to the callee; pops is set to
599       the number of bytes that were pushed onto the stack.
600    5. The cproto decoder (compiler/Semant/types/cproto.sml) now can
601       distinguish between "ccall" and "stdcall".
602    6. The UNIMP instruction has been added to the supported Sparc instruction
603       set. (This is needed for implementing the official C calling convention
604       on this architecture.)
605    7. I fixed some of the .cm files under src/MLRISC/Tools to make them
606       work with the latest CM.
607    
608    ----------------------------------------------------------------------
609    Name: Matthias Blume
610    Date: 2001/06/05 15:10:00 EDT
611    Tag: blume-20010605-cm-index
612    Description:
613    
614    0. The "lambdasplit" parameter for class "sml" in CM has been documented.
615    
616    1. CM can now generate "index files".  These are human-readable files
617       that list on a per-.cm-file basis each toplevel symbol defined or
618       imported.  The location of the index file for
619       <p>/<d>.cm is <p>/CM/INDEX/<d>.cm.
620       To enable index-file generation, set CM.Control.generate_index to true
621       or export an environment-symbol: export CM_GENERATE_INDEX=true.
622    
623       The CM manual has been updated accordingly.
624    
625    2. I made some slight modifications to the c-calls API in MLRISC.
626    
627         a) There is now a callback to support saving/restoring of
628            dedicated but caller-save registers around the actual call
629            instruction.
630         b) One can optionally specify a comment-annotation for the
631            call instruction.
632    
633    3. SML/NJ (mlriscGen.sml) uses this new API for the rawccall primop.
634       (For example, the comment annotation shows the C prototype of
635        the function being called.)
636    
637    ----------------------------------------------------------------------
638    Name: Matthias Blume
639    Date: 2001/06/01 13:30:00 EDT
640    Tag: blume-20010601-nlffi-cleanup
641    Description:
642    
643    This is mostly a cleanup of MLFFI stuff:
644    
645       - some signature files have been put into a more exposed place
646       - the ugly 'f type parameter is gone (simplifies types tremendously!)
647       - ml-nlffigen changed accordingly
648       - tutorial updated
649    
650    Other changes:
651    
652       - author's affiliation in CM manual(s) updated
653       - some more recognized keywords added to Allen's sml.sty
654    
655    ----------------------------------------------------------------------
656    Name: Matthias Blume
657  Date: 2001/05/25 15:30:00 EDT  Date: 2001/05/25 15:30:00 EDT
658  Tag: blume-20010525-iptr  Tag: blume-20010525-iptr
659  Description:  Description:

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