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revision 847, Mon Jun 25 16:11:22 2001 UTC revision 1096, Tue Feb 26 16:59:02 2002 UTC
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8  The form of an entry should be:  The form of an entry should be:
9    
10  Name:  Name:
11  Date:  Date: yyyy/mm/dd
12  Tag: <post-commit CVS tag>  Tag: <post-commit CVS tag>
13  Description:  Description:
14    
15  ----------------------------------------------------------------------  ----------------------------------------------------------------------
16  Name: Matthias Blume  Name: Matthias Blume
17    Date: 2002/02/26 12:00:00 EST
18    Tag: blume-20020226-ffi
19    Description:
20    
21    1. Fixed a minor bug in CM's "noweb" tool:
22       If numbering is turned off, then truly don't number (i.e., do not
23       supply the -L option to noweb).  The previous behavior was to supply
24       -L'' -- which caused noweb to use the "default" line numbering scheme.
25       Thanks to Chris Richards for pointing this out (and supplying the fix).
26    
27    2. Once again, I reworked some aspects of the FFI:
28    
29       A. The incomplete/complete type business:
30    
31       - Signatures POINTER_TO_INCOMPLETE_TYPE and accompanying functors are
32         gone!
33       - ML types representing an incomplete type are now *equal* to
34         ML types representing their corresponding complete types (just like
35         in C).  This is still safe because ml-nlffigen will not generate
36         RTTI for incomplete types, nor will it generate functions that
37         require access to such RTTI.   But when ML code generated from both
38         incomplete and complete versions of the C type meet, the ML types
39         are trivially interoperable.
40    
41         NOTE:  These changes restore the full generality of the translation
42         (which was previously lost when I eliminated functorization)!
43    
44       B. Enum types:
45    
46       - Structure C now has a type constructor "enum" that is similar to
47         how the "su" constructor works.  However, "enum" is not a phantom
48         type because each "T enum" has values (and is isomorphic to
49         MLRep.Signed.int).
50       - There are generic access operations for enum objects (using
51         MLRep.Signed.int).
52       - ml-nlffigen will generate a structure E_foo for each "enum foo".
53         * The structure contains the definition of type "mlrep" (the ML-side
54         representation type of the enum).  Normally, mlrep is the same
55         as "MLRep.Signed.int", but if ml-nlffigen was invoked with "-ec",
56         then mlrep will be defined as a datatype -- thus facilitating
57         pattern matching on mlrep values.
58         ("-ec" will be suppressed if there are duplicate values in an
59          enumeration.)
60         * Constructors ("-ec") or values (no "-ec") e_xxx of type mlrep
61         will be generated for each C enum constant xxx.
62         * Conversion functions m2i and i2m convert between mlrep and
63         MLRep.Signed.int.  (Without "-ec", these functions are identities.)
64         * Coversion functions c and ml convert between mlrep and "tag enum".
65         * Access functions (get/set) fetch and store mlrep values.
66       - By default (unless ml-nlffigen was invoked with "-nocollect"), unnamed
67         enumerations are merged into one single enumeration represented by
68         structure E_'.
69    
70    ----------------------------------------------------------------------
71    Name: Allen Leung
72    Date: 2002/02/25 04:45:00 EST
73    Tag: leunga-20020225-cps-spill
74    
75    This is a new implementation of the CPS spill phase.
76    The new phase is in the new file compiler/CodeGen/cpscompile/spill-new.sml
77    In case of problems, replace it with the old file spill.sml
78    
79    The current compiler runs into some serious performance problems when
80    constructing a large record.  This can happen when we try to compile a
81    structure with many items.  Even a very simple structure like the following
82    makes the compiler slow down.
83    
84        structure Foo = struct
85           val x_1 = 0w1 : Word32.int
86           val x_2 = 0w2 : Word32.int
87           val x_3 = 0w3 : Word32.int
88           ...
89           val x_N = 0wN : Word32.int
90        end
91    
92    The following table shows the compile time, from N=1000 to N=4000,
93    with the old compiler:
94    
95    N
96    1000   CPS 100 spill                           0.04u  0.00s  0.00g
97           MLRISC ra                               0.06u  0.00s  0.05g
98              (spills = 0 reloads = 0)
99           TOTAL                                   0.63u  0.07s  0.21g
100    
101    1100   CPS 100 spill                           8.25u  0.32s  0.64g
102           MLRISC ra                               5.68u  0.59s  3.93g
103              (spills = 0 reloads = 0)
104           TOTAL                                   14.71u  0.99s  4.81g
105    
106    1500   CPS 100 spill                           58.55u  2.34s  1.74g
107           MLRISC ra                               5.54u  0.65s  3.91g
108              (spills = 543 reloads = 1082)
109           TOTAL                                   65.40u  3.13s  6.00g
110    
111    2000   CPS 100 spill                           126.69u  4.84s  3.08g
112           MLRISC ra                               0.80u  0.10s  0.55g
113              (spills = 42 reloads = 84)
114           TOTAL                                   129.42u  5.10s  4.13g
115    
116    3000   CPS 100 spill                           675.59u  19.03s  11.64g
117           MLRISC ra                               2.69u  0.27s  1.38g
118              (spills = 62 reloads = 124)
119           TOTAL                                   682.48u  19.61s  13.99g
120    
121    4000   CPS 100 spill                           2362.82u  56.28s  43.60g
122           MLRISC ra                               4.96u  0.27s  2.72g
123              (spills = 85 reloads = 170)
124           TOTAL                                   2375.26u  57.21s  48.00g
125    
126    As you can see the old cps spill module suffers from some serious
127    performance problem but since I cannot decipher the old code fully,
128    innstead of patching the problems up, I'm reimplementing it
129    with a different algorithm.  The new code is more modular,
130    smaller when compiled, and substantially faster
131    (O(n log n) time and O(n) space).  Timing of the new spill module:
132    
133    4000  CPS 100 spill                           0.02u  0.00s  0.00g
134          MLRISC ra                               0.25u  0.02s  0.15g
135             (spills=1 reloads=3)
136          TOTAL                                   7.74u  0.34s  1.62g
137    
138    Implementation details:
139    
140    As far as I can tell, the purpose of the CPS spill module is to make sure the
141    number of live variables at any program point (the bandwidth)
142    does not exceed a certain limit, which is determined by the
143    size of the spill area.
144    
145    When the bandwidth is too large, we decrease the register pressure by
146    packing live variables into spill records.  How we achieve this is
147    completely different than what we did in the old code.
148    
149    First, there is something about the MLRiscGen code generator
150    that we should be aware of:
151    
152    o MLRiscGen performs code motion!
153    
154       In particular, it will move floating point computations and
155       address computations involving only the heap pointer to
156       their use sites (if there is only a single use).
157       What this means is that if we have a CPS record construction
158       statement
159    
160           RECORD(k,vl,w,e)
161    
162       we should never count the new record address w as live if w
163       has only one use (which is often the case).
164    
165       We should do something similar to floating point, but the transformation
166       there is much more complex, so I won't deal with that.
167    
168    Secondly, there are now two new cps primops at our disposal:
169    
170     1. rawrecord of record_kind option
171        This pure operator allocates some uninitialized storage from the heap.
172        There are two forms:
173    
174         rawrecord NONE [INT n]  allocates a tagless record of length n
175         rawrecord (SOME rk) [INT n] allocates a tagged record of length n
176                                     and initializes the tag.
177    
178     2. rawupdate of cty
179          rawupdate cty (v,i,x)
180          Assigns to x to the ith component of record v.
181          The storelist is not updated.
182    
183    We use these new primops for both spilling and increment record construction.
184    
185     1. Spilling.
186    
187        This is implemented with a linear scan algorithm (but generalized
188        to trees).  The algorithm will create a single spill record at the
189        beginning of the cps function and use rawupdate to spill to it,
190        and SELECT or SELp to reload from it.  So both spills and reloads
191        are fine-grain operations.  In contrast, in the old algorithm
192        "spills" have to be bundled together in records.
193    
194        Ideally, we should sink the spill record construction to where
195        it is needed.  We can even split the spill record into multiple ones
196        at the places where they are needed.  But CPS is not a good
197        representation for global code motion, so I'll keep it simple and
198        am not attempting this.
199    
200     2. Incremental record construction (aka record splitting).
201    
202        Long records with many component values which are simulatenously live
203        (recall that single use record addresses are not considered to
204         be live) are constructed with rawrecord and rawupdate.
205        We allocate space on the heap with rawrecord first, then gradually
206        fill it in with rawupdate.  This is the technique suggested to me
207        by Matthias.
208    
209        Some restrictions on when this is applicable:
210        1. It is not a VECTOR record.  The code generator currently does not handle
211           this case. VECTOR record uses double indirection like arrays.
212        2. All the record component values are defined in the same "basic block"
213           as the record constructor.  This is to prevent speculative
214           record construction.
215    
216    ----------------------------------------------------------------------
217    Name: Allen Leung
218    Date: 2002/02/22 01:02:00 EST
219    Tag: leunga-20020222-mlrisc-tools
220    
221    Minor bug fixes in the parser and rewriter
222    
223    ----------------------------------------------------------------------
224    Name: Allen Leung
225    Date: 2002/02/21 20:20:00 EST
226    Tag: leunga-20020221-peephole
227    
228    Regenerated the peephole files.  Some contained typos in the specification
229    and some didn't compile because of pretty printing bugs in the old version
230    of 'nowhere'.
231    
232    ----------------------------------------------------------------------
233    Name: Allen Leung
234    Date: 2002/02/19 20:20:00 EST
235    Tag: leunga-20020219-mlrisc-tools
236    Description:
237    
238       Minor bug fixes to the mlrisc-tools library:
239    
240       1.  Fixed up parsing colon suffixed keywords
241       2.  Added the ability to shut the error messages up
242       3.  Reimplemented the pretty printer and fixed up/improved
243           the pretty printing of handle and -> types.
244       4.  Fixed up generation of literal symbols in the nowhere tool.
245       5.  Added some SML keywords to to sml.sty
246    
247    ----------------------------------------------------------------------
248    Name: Matthias Blume
249    Date: 2002/02/19 16:20:00 EST
250    Tag: blume-20020219-cmffi
251    Description:
252    
253    A wild mix of changes, some minor, some major:
254    
255    * All C FFI-related libraries are now anchored under $c:
256        $/c.cm      --> $c/c.cm
257        $/c-int.cm  --> $c/internals/c-int.cm
258        $/memory.cm --> $c/memory/memory.cm
259    
260    * "make" tool (in CM) now treats its argument pathname slightly
261      differently:
262        1. If the native expansion is an absolute name, then before invoking
263           the "make" command on it, CM will apply OS.Path.mkRelative
264           (with relativeTo = OS.FileSys.getDir()) to it.
265        2. The argument will be passed through to subsequent phases of CM
266           processing without "going native".  In particular, if the argument
267           was an anchored path, then "make" will not lose track of that anchor.
268    
269    * Compiler backends now "know" their respective C calling conventions
270      instead of having to be told about it by ml-nlffigen.  This relieves
271      ml-nlffigen from one of its burdens.
272    
273    * The X86Backend has been split into X86CCallBackend and X86StdCallBackend.
274    
275    * Export C_DEBUG and C_Debug from $c/c.cm.
276    
277    * C type encoding in ml-nlffi-lib has been improved to model the conceptual
278      subtyping relationship between incomplete pointers and their complete
279      counterparts.  For this, ('t, 'c) ptr has been changed to 'o ptr --
280      with the convention of instantiating 'o with ('t, 'c) obj whenever
281      the pointer target type is complete.  In the incomplete case, 'o
282      will be instantiated with some "'c iobj" -- a type obtained by
283      using one of the functors PointerToIncompleteType or PointerToCompleteType.
284    
285      Operations that work on both incomplete and complete pointer types are
286      typed as taking an 'o ptr while operations that require the target to
287      be known are typed as taking some ('t, 'c) obj ptr.
288    
289      voidptr is now a bit "more concrete", namely "type voidptr = void ptr'"
290      where void is an eqtype without any values.  This makes it possible
291      to work on voidptr values using functions meant to operate on light
292      incomplete pointers.
293    
294    * As a result of the above, signature POINTER_TO_INCOMPLETE_TYPE has
295      been vastly simplified.
296    
297    ----------------------------------------------------------------------
298    Name: Matthias Blume
299    Date: 2002/02/19 10:48:00 EST
300    Tag: blume-20020219-pqfix
301    Description:
302    
303    Applied Chris Okasaki's bug fix for priority queues.
304    
305    ----------------------------------------------------------------------
306    Name: Matthias Blume
307    Date: 2002/02/15 17:05:00
308    Tag: Release_110_39
309    Description:
310    
311    Last-minute retagging is becoming a tradition... :-(
312    
313    This is the working release 110.39.
314    
315    ----------------------------------------------------------------------
316    Name: Matthias Blume
317    Date: 2002/02/15 16:00:00 EST
318    Tag: Release_110_39-orig
319    Description:
320    
321    Working release 110.39.  New bootfiles.
322    
323    (Update: There was a small bug in the installer so it wouldn't work
324    with all shells.  So I retagged. -Matthias)
325    
326    ----------------------------------------------------------------------
327    Name: Matthias Blume
328    Date: 2002/02/15 14:17:00 EST
329    Tag: blume-20020215-showbindings
330    Description:
331    
332    Added EnvRef.listBoundSymbols and CM.State.showBindings.  Especially
333    the latter can be useful for exploring what bindings are available at
334    the interactive prompt.  (The first function returns only the list
335    of symbols that are really bound, the second prints those but also the
336    ones that CM's autoloading mechanism knows about.)
337    
338    ----------------------------------------------------------------------
339    Name: Matthias Blume
340    Date: 2002/02/15 12:08:00 EST
341    Tag: blume-20020215-iptrs
342    Description:
343    
344    Two improvements to ml-nlffigen:
345    
346      1. Write files only if they do not exist or if their current contents
347         do not coincide with what's being written.  (That is, avoid messing
348         with the time stamps unless absolutely necessary.)
349    
350      2. Implement a "repository" mechanism for generated files related
351         to "incomplete pointer types".   See the README file for details.
352    
353    ----------------------------------------------------------------------
354    Name: Matthias Blume
355    Date: 2002/02/14 11:50:00 EST
356    Tag: blume-20020214-quote
357    Description:
358    
359    Added a type 't t_' to tag.sml (in ml-nlffi-lib.cm).  This is required
360    because of the new and improved tag generation scheme.  (Thanks to Allen
361    Leung for pointing it out.)
362    
363    ----------------------------------------------------------------------
364    Name: Lal George
365    Date: 2002/02/14 09:55:27 EST 2002
366    Tag: george-20020214-isabelle-bug
367    Description:
368    
369    Fixed the MLRISC bug sent by Markus Wenzel regarding the compilation
370    of Isabelle on the x86.
371    
372    From Allen:
373    -----------
374     I've found the problem:
375    
376         in ra-core.sml, I use the counter "blocked" to keep track of the
377         true number of elements in the freeze queue.  When the counter goes
378         to zero, I skip examining the queue.  But I've messed up the
379         bookkeeping in combine():
380    
381             else ();
382             case !ucol of
383               PSEUDO => (if !cntv > 0 then
384                     (if !cntu > 0 then blocked := !blocked - 1 else ();
385                                        ^^^^^^^^^^^^^^^^^^^^^^^
386                      moveu := mergeMoveList(!movev, !moveu)
387                     )
388                  else ();
389    
390         combine() is called to coalesce two nodes u and v.
391         I think I was thinking that if the move counts of u and v are both
392         greater than zero then after they are coalesced then one node is
393         removed from the freeze queue.  Apparently I was thinking that
394         both u and v are of low degree, but that's clearly not necessarily true.
395    
396    
397    02/12/2002:
398        Here's the patch.  HOL now compiles.
399    
400        I don't know how this impact on performance (compile
401        time or runtime).  This bug caused the RA (especially on the x86)
402        to go thru the potential spill phase when there are still nodes on the
403        freeze queue.
404    
405    
406    
407    
408    ----------------------------------------------------------------------
409    Name: Matthias Blume
410    Date: 2002/02/13 22:40:00 EST
411    Tag: blume-20020213-fptr-rtti
412    Description:
413    
414    Fixed a bug in ml-nlffigen that was introduced with one of the previous
415    updates.
416    
417    ----------------------------------------------------------------------
418    Name: Matthias Blume
419    Date: 2002/02/13 16:41:00 EST
420    Tag: blume-20020213-cmlpq
421    Description:
422    
423    Added new priority queue export symbols (which have just been added to
424    smlnj-lib.cm) to CML's version of smlnj-lib.cm.  (Otherwise CML would
425    not compile and the installer would choke.)
426    
427    ----------------------------------------------------------------------
428    Name: Matthias Blume
429    Date: 2002/02/13 16:15:00 EST
430    Tag: blume-20020213-various
431    Description:
432    
433    1. More tweaks to ml-nlffigen:
434    
435       - better internal datastructures (resulting in slight speedup)
436       - "-match" option requires exact match
437       - "localized" gensym counters (untagged structs/unions nested within
438         other structs/unions or within typedefs get a fresh counter; their
439         tag will be prefixed by a concatenation of their parents' tags)
440       - bug fixes (related to calculation of transitive closure of types
441         to be included in the output)
442    
443    2. Minor Basis updates:
444    
445       - added implementations for List.collate and Option.app
446    
447    ----------------------------------------------------------------------
448    Name: Matthias Blume
449    Date: 2002/02/11 15:55:00 EST
450    Tag: blume-20020211-gensym
451    Description:
452    
453    Added a "-gensym" option to command line of ml-nlffigen.  This can be
454    used to specify a "stem" -- a string that is inserted in all "gensym'd"
455    names (ML structure names that correspond to unnamed C structs, unions,
456    and enums), so that separate runs of ml-nlffigen do not clash.
457    
458    ----------------------------------------------------------------------
459    Name: Matthias Blume
460    Date: 2002/02/11 12:05:00 EST
461    Tag: blume-20020211-gensml
462    Description:
463    
464    A quick fix for a problem with GenSML (in the pgraph-util library):
465    Make generation of toplevel "local" optional.  (Strictly speaking,
466    signature definitions within "local" are not legal SML.)
467    
468    Other than that: updates to INSTALL and cm/TODO.
469    
470    ----------------------------------------------------------------------
471    Name: Matthias Blume
472    Date: 2002/02/08 15:00:00 EST
473    Tag: blume-20020208-uniquepid
474    Description:
475    
476    0. Version number has been bumped to 110.38.1.  NEW BOOTFILES!!!
477    
478    1. The installer (config/install.sh) has gotten smarter:
479    
480         - Configuration options are a bit easier to specify now
481           (in config/targets).
482         - Bug in recognizing .tar.bz2 files fixed.
483         - Installer automatically resolves dependencies between
484           configuration options (e.g., if you ask for eXene, you will
485           also get cml -- regardless whether you asked for it or not).
486         - Installer can run in "quieter mode" by setting the environment
487           variable INSTALL_QUIETLY to "true".  "Quieter" does not mean
488           "completely silent", though.
489         - Build HashCons library as part of smlnj-lib.
490    
491    2. A new scheme for assigning persistent identifiers to compilation
492       units (and, by extension, to types etc.) has been put into place.
493       This fixes a long-standing bug where types and even dynamic values
494       can get internally confused, thereby compromising type safety
495       (abstraction) and dynamic correctness.  See
496    
497         http://cm.bell-labs.com/cm/cs/who/blume/pid-confusion.tgz
498    
499       for an example of how things could go wrong until now.
500    
501       The downside of the new scheme is that pids are not quite as
502       persistent as they used to be: CM will generate a fresh pid
503       for every compilation unit that it thinks it sees for the first
504       time.  That means that if you compile starting from a clean, fresh
505       source tree at two different times, you end up with different
506       binaries.
507    
508       Cutoff recompilation, however, has not been compromised because
509       CM keeps pid information in special caches between runs.
510    
511    ----------------------------------------------------------------------
512    Name: Lal George
513    Date: 2002/02/07 15:34:13 EST 2002
514    Tag: <none>
515    Description:
516    
517    Compilers that generate assembly code may produce  global labels
518    whose value is resolved at link time. The various peephole optimization
519    modules did not take this in account.
520    
521    TODO. The Labels.addrOf function should really return an option
522    type so that clients are forced to deal with this issue, rather
523    than an exception being raised.
524    
525    ----------------------------------------------------------------------
526    Name: Lal George
527    Date: 2002/02/06 13:55:02 EST
528    Tag: george-20020206-ra-breakup
529    Description:
530    
531    1. A bug fix from Allen.
532    
533        A typo causes extra fstp %st(0)'s to be generated at compensation
534        edges, which might cause stack underflow traps at runtime.  This
535        occurs in fft where there are extraneous fstps right before the 'into'
536        trap instruction (in this case they are harmless since none of the
537        integers overflow.)
538    
539    2. Pulled out various utility modules that were embedded in the modules
540       of the register allocator. I need these modules for other purposes, but
541       they are not complete enough to put into a library (just yet).
542    ----------------------------------------------------------------------
543    Name: Matthias Blume
544    Date: 2002/01/31 16:05:00 EST
545    Tag: blume-20020131-sparc-ccalls
546    Description:
547    
548    1. C-calls on Sparc needlessly allocated a huge chunk (96 bytes)
549       of extra stack space by mistake.  Fixed.
550    
551    2. Bug in logic of handling of command-line options in ml-nlffigen fixed.
552    
553    ----------------------------------------------------------------------
554    Name: Allen Leung
555    Date: 2002/01/30
556    Tag: leunga-20020130-nowhere-bug-fix
557    Description:
558    
559       MLRISC bug fixes:
560       1. Fixed a bindings computation bug in the 'nowhere' program generator tool.
561       2. MachineInt.fromString was negating its value.
562    
563    ----------------------------------------------------------------------
564    Name: Matthias Blume
565    Date: 2002/01/29
566    Tag: blume-20020129-INSTALL
567    Description:
568    
569    - Added somewhat detailed installation instructions (file INSTALL).
570    - Fixed curl-detection bug in config/install.sh.
571    - It is now possible to select the URL getter using the URLGETTER
572      environment variable:
573    
574          not set / "unknown"      --> automatic detection (script tries wget,
575                                       curl, and lynx)
576          "wget" / "curl" / "lynx" --> use the specified program (script "knows"
577                                       how to properly invoke them)
578          other                    --> use $URLGETTER directly, it must take
579                                       precisely two command-line arguments
580                                       (source URL and destination file name)
581    
582    ----------------------------------------------------------------------
583    Name: Matthias Blume
584    Date: 2002/01/28
585    Tag: blume-20020128-sparc-ccalls
586    Description:
587    
588    - Fixed problem with calculation of "used" registers in sparc-c-calls.
589    - Make use of the allocParam argument in sparc-c-calls.
590    
591    ----------------------------------------------------------------------
592    Name: Matthias Blume
593    Date: 2002/01/28
594    Tag: blume-20020128-allocParam
595    Description:
596    
597    John Reppy:  Changes c-calls API to accept client-callback for
598    allocating extra stack space.
599    me: Corresponding changes to mlriscGen (using a dummy argument that
600        does not change the current behavior).
601    
602    ----------------------------------------------------------------------
603    Name: Matthias Blume
604    Date: 2002/01/28 12:00:00
605    Tag: Release_110_38
606    Description:
607    
608    This time for real!!!
609    
610    ----------------------------------------------------------------------
611    Name: Matthias Blume
612    Date: 2002/01/28 10:56:00 EST
613    Tag: blume-20020128-retraction
614    Description:
615    
616    0. Retracted earlier 110.38.  (The Release_110_38 tag has been replaced
617       with blume-Release_110_38-retracted.)
618    
619    1. Fixed a problem with incorrect rounding modes in real64.sml.
620       (Thanks to Andrew Mccreight <andrew.mccreight@yale.edu>.)
621    
622    2. A bug in ml-nlffigen related to the handling of unnamed structs, unions,
623       and enums fixed.  The naming of corresponding ML identifiers should
624       now be consistent again.
625    
626    ----------------------------------------------------------------------
627    Name: Allen Leung
628    Date: 2002/01/27
629    Tag: leunga-20020127-nowhere
630    Description:
631    
632       Added a target called nowhere in the configuration scripts.
633       Enabling this will build the MLRISC 'nowhere' tool (for translating
634       programs with where-clauses into legal SML code) during installation.
635    
636    ----------------------------------------------------------------------
637    Name: Matthias Blume
638    Date: 2002/01/25 21:27:00 EST
639    Tag: blume-Release_110_38-retracted
640    Description:
641    
642    Call it a (working) release!  Version is 110.38. Bootfiles are ready.
643    
644    README will be added later.
645    
646    !!! NOTE:  Re-tagged as blume-Release_110_38-retracted. Original tag
647    (Release_110_38) removed.  Reason: Last-minute bug fixes.
648    
649    ----------------------------------------------------------------------
650    Name: Matthias Blume
651    Date: 2002/01/25
652    Tag: blume-20020125-ffi
653    Description:
654    
655    A large number of tweaks and improvements to ml-nlffi-lib and
656    ml-nlffigen:
657    
658       - ML represenation types have been streamlined
659       - getter and setter functions work with concrete values, not abstract
660         ones where possible
661       - ml-nlffigen command line more flexible (see README file there)
662       - some bugs have been fixed (hopefully)
663    
664    ----------------------------------------------------------------------
665    Name: Lal George
666    Date: 2002/01/24
667    Tag: george-20020124-risc-ra-interface
668    Description:
669    
670       There is a dramatic simplification in the interface to the
671       register allocator for RISC architectures as a result of making
672       parallel copy instructions explicit.
673    
674    ----------------------------------------------------------------------
675    Name: Matthias Blume
676    Date: 2002/01/22
677    Tag: blume-20020122-x86-ccalls
678    Description:
679    
680    Bug fix for c-calls on x86 (having to do with how char- and
681    short-arguments are being handled).
682    
683    ----------------------------------------------------------------------
684    Name: Matthias Blume
685    Date: 2002/01/21
686    Tag: blume-20020121-ff
687    Description:
688    
689    Another day of fiddling with the FFI...
690    
691    1. Bug fix/workaround:  CKIT does not complain about negative array
692       dimensions, so ml-nlffigen has to guard itself against this possibility.
693       (Otherwise a negative dimension would send it into an infinite loop.)
694    
695    2. Some of the abstract types (light objects, light pointers, most "base"
696       types) in structure C are now eqtypes.
697    
698    3. Added constructors and test functions for NULL function pointers.
699    
700    ----------------------------------------------------------------------
701    Name: Matthias Blume
702    Date: 2002/01/18
703    Tag: blume-20020118-ready-for-new-release
704    Description:
705    
706    Made config/srcarchiveurl point to a new place.  (Will provide boot
707    files shortly.)
708    
709    Maybe we christen this to be 110.38?
710    
711    ----------------------------------------------------------------------
712    Name: Matthias Blume
713    Date: 2002/01/18
714    Tag: blume-20020118-more-ffifiddle
715    Description:
716    
717    Today's FFI fiddling:
718    
719      - Provided a structure CGetSet with "convenient" versions of C.Get.* and
720        C.Set.* that use concrete (MLRep.*) arguments and results instead
721        of abstract ones.
722    
723      - Provided word-style bit operations etc. for "int" representation
724        types in MLRep.S<Foo>Bitops where <Foo> ranges over Char, Int, Short,
725        and Long.
726    
727    ----------------------------------------------------------------------
728    Name: Matthias Blume
729    Date: 2002/01/18
730    Tag: blume-20020118-use-x86-fp
731    Description:
732    
733    Now that x86-fast-fp seems to be working, I turned it back on again
734    by default.  (Seems to work fine now, even with the FFI.)
735    
736    Other than that, I added some documentation about the FFI to
737    src/ml-nlffigen/README and updated the FFI test examples in
738    src/ml-nlffi-lib/Tests/*.
739    
740    ----------------------------------------------------------------------
741    Name: Allen Leung
742    Date: 2002/01/17
743    Tag: leunga-20020117-x86-fast-fp-call
744    Description:
745    
746       1. Fixed a problem with handling return fp values when x86's fast fp
747          mode is turned on.
748    
749       2. Minor pretty printing fix for cellset.  Print %st(0) as %st(0) instead
750          of %f32.
751    
752       3. Added a constructor INT32lit to the ast of MLRISC tools.
753    
754    ----------------------------------------------------------------------
755    Name: Matthias Blume
756    Date: 2002/01/16
757    Tag: blume-20020116-ffifiddle
758    Description:
759    
760    More fiddling with the FFI interface:
761    
762     - Make constness 'c instead of rw wherever possible.  This eliminates
763       the need for certain explicit coercions.  (However, due to ML's
764       value polymorphism, there will still be many cases where explicit
765       coercions are necessary.  Phantom types are not the whole answer
766       to modeling a subtyping relationship in ML.)
767    
768     - ro/rw coersions for pointers added.  (Avoids the detour through */&.)
769    
770     - "printf" test example added to src/ml-nlffi-lib/Tests.  (Demonstrates
771       clumsy workaround for varargs problem.)
772    
773    ----------------------------------------------------------------------
774    Name: Lal George
775    Date: 2002/01/15
776    Tag: <none>
777    Description:
778    
779    1. Since COPY instructions are no longer native to the architecture,
780       a generic functor can be used to implement the expandCopies function.
781    
782    2. Allowed EXPORT and IMPORT pseudo-op declarations to appear inside a
783       TEXT segment.
784    
785    ----------------------------------------------------------------------
786    Name: Matthias Blume
787    Date: 2002/01/15
788    Tag: blume-20020115-ffiupdates
789    Description:
790    
791    1. Fix for bug resulting in single-precision float values being returned
792       incorrectly from FFI calls.
793    
794    2. Small modifications to C FFI API:
795    
796        - memory-allocation routines return straight objects (no options)
797          and raise an exception in out-of-memory situations
798        - unsafe extensions to cast between function pointers and pointers
799          from/to ints
800        - added structure C_Debug as an alternative to structure C where
801          pointer-dereferencing (|*| and |*!) always check for null-pointers
802        - added open_lib' to DynLinkage;  open_lib' works like open_lib
803          but also takes a (possibly empty) list of existing library handles
804          that the current library depends on
805    
806    ----------------------------------------------------------------------
807    Name: Matthias Blume
808    Date: 2002/01/10
809    Tag: blume-20020110-newffigen
810    Description:
811    
812    1. Updates to portable graph code.
813    
814    2. Major update to ml-nlffigen and ml-nlffi-lib.  Things are much
815       more scalable now so that even huge interfaces such as the one
816       for GTK compile in finite time and space. :-)
817       See src/ml-nlffigen/README for details on what's new.
818    
819    ----------------------------------------------------------------------
820    Name: Lal George
821    Date: 2001/01/09 14:31:35 EST 2002
822    Tag: george-20011206-rm-native-copy
823    Description:
824    
825            Removed the native COPY and FCOPY instructions
826            from all the architectures and replaced it with the
827            explicit COPY instruction from the previous commit.
828    
829            It is now possible to simplify many of the optimizations
830            modules that manipulate copies. This has not been
831            done in this change.
832    
833    ----------------------------------------------------------------------
834    Name: Lal George
835    Date: 2001/12/06 16:50:13 EST 2001
836    Tag: george-20011206-mlrisc-instruction
837    Description:
838    
839    Changed the representation of instructions from being fully abstract
840    to being partially concrete. That is to say:
841    
842      from
843            type instruction
844    
845      to
846            type instr                              (* machine instruction *)
847    
848            datatype instruction =
849                LIVE of {regs: C.cellset, spilled: C.cellset}
850              | KILL of {regs: C.cellset, spilled: C.cellset}
851              | COPYXXX of {k: CB.cellkind, dst: CB.cell list, src: CB.cell list}
852              | ANNOTATION of {i: instruction, a: Annotations.annotation}
853              | INSTR of instr
854    
855    This makes the handling of certain special instructions that appear on
856    all architectures easier and uniform.
857    
858    LIVE and KILL say that a list of registers are live or killed at the
859    program point where they appear. No spill code is generated when an
860    element of the 'regs' field is spilled, but the register is moved to
861    the 'spilled' (which is present, more for debugging than anything else).
862    
863    LIVE replaces the (now deprecated) DEFFREG instruction on the alpha.
864    We used to generate:
865    
866            DEFFREG f1
867            f1 := f2 + f3
868            trapb
869    
870    but now generate:
871    
872            f1 := f2 + f3
873            trapb
874            LIVE {regs=[f1,f2,f3], spilled=[]}
875    
876    Furthermore, the DEFFREG (hack) required that all floating point instruction
877    use all registers mentioned in the instruction. Therefore f1 := f2 + f3,
878    defines f1 and uses [f1,f2,f3]! This hack is no longer required resulting
879    in a cleaner alpha implementation. (Hopefully, intel will not get rid of
880    this architecture).
881    
882    COPYXXX is intended to replace the parallel COPY and FCOPY  available on
883    all the architectures. This will result in further simplification of the
884    register allocator that must be aware of them for coalescing purposes, and
885    will also simplify certain aspects of the machine description that provides
886    callbacks related to parallel copies.
887    
888    ANNOTATION should be obvious, and now INSTR represents the honest to God
889    machine instruction set!
890    
891    The <arch>/instructions/<arch>Instr.sml files define certain utility
892    functions for making porting easier -- essentially converting upper case
893    to lower case. All machine instructions (of type instr) are in upper case,
894    and the lower case form generates an MLRISC instruction. For example on
895    the alpha we have:
896    
897      datatype instr =
898         LDA of {r:cell, b:cell, d:operand}
899       | ...
900    
901      val lda : {r:cell, b:cell, d:operand} -> instruction
902        ...
903    
904    where lda is just (INSTR o LDA), etc.
905    
906    ----------------------------------------------------------------------
907    Name: Matthias Blume
908    Date: 2001/11/22 21:40:00 EST
909    Tag: Release_110_37
910    Description:
911    
912    Release 110.37.  This time for real.
913    
914    ----------------------------------------------------------------------
915    Name: Matthias Blume
916    Date: 2001/11/21 16:35:00 EST
917    Tag: blume-20011121-foot-in-mouth
918    Description:
919    
920    Removed the "Release_110_37" tag because of a serious bug.
921    This will be re-tagged once the bug is fixed.
922    
923    ----------------------------------------------------------------------
924    Name: Matthias Blume
925    Date: 2001/11/21 16:14:00 EST
926    Tag: blume-20011121-forgottenfile
927    Description:
928    
929    Forgot to add a file.  (Just a .tex-file -- part of
930    the CM manual source.)
931    
932    ----------------------------------------------------------------------
933    Name: Matthias Blume
934    Date: 2001/11/21 16:10:00 EST
935    Tag: blume-20011121-invalid_110_37
936    Description:
937    
938    Note: I removed the original tag "Release_110_37" from this commit
939          because we found a serious bug in all non-x86 backends.
940          - Matthias
941    
942    1. Modifications to the SML/NJ code generator and to the runtime system
943       so that code object name strings are directly inserted into code
944       objects at code generation time.  The only business the runtime system
945       has with this is now to read the name strings on occasions.
946       (The encoding of the name string has also changed somewhat.)
947    
948    2. CM now implements a simple "set calculus" for specifying export lists.
949       In particular, it is now possible to refer to the export lists of
950       other libraries/groups/sources and form unions as well as differences.
951       See the latest CM manual for details.
952    
953    3. An separate notion of "proxy" libraries has again be eliminated from
954       CM's model.  (Proxy libraries are now simply a special case of using
955       the export list calculus.)
956    
957    4. Some of the existing libraries now take advantage of the new set
958       calculus.
959       (Notice that not all libraries have been converted because some
960       of the existing .cm-files are supposed to be backward compatible
961       with 110.0.x.)
962    
963    5. Some cleanup in stand-alone programs.  (Don't use "exnMessage" -- use
964       "General.exnMessage"!  The former relies on a certain hook to be
965       initialized, and that often does not happen in the stand-alone case.)
966    
967    ----------------------------------------------------------------------
968    Name: Lal George
969    Date: 2001/11/21  13:56:18 EST
970    Tag: george-2001121-pseudo-ops
971    Description:
972    
973      Implemented a complete redesign of MLRISC pseudo-ops. Now there
974      ought to never be any question of incompatabilities with
975      pseudo-op syntax expected by host assemblers.
976    
977      For now, only modules supporting GAS syntax are implemented
978      but more should follow, such as MASM, and vendor assembler
979      syntax, e.g. IBM as, Sun as, etc.
980    
981    ----------------------------------------------------------------------
982    Name: Matthias Blume
983    Date: 2001/11/14 11:52:00 EST
984    Tag: blume-20011114-srcname
985    Description:
986    
987    1. Routed the name of the current source file to mlriscgen where it
988       should be directly emitted into the code object.  (This last part
989       is yet to be done.)
990    
991    2. Some cleanup of the pgraph code to make it match the proposal that
992       I put out the other day.  (The proposal notwithstanding, things are
993       still in flux here.)
994    
995    ----------------------------------------------------------------------
996    Name: Lal George
997    Date: 2001/11/14 09:44:04 EST
998    Tag:
999    Description:
1000    
1001      Fix for a backpatching bug reported by Allen.
1002    
1003      Because the boundary between short and long span-dependent
1004      instructions is +/- 128, there are an astounding number of
1005      span-dependent instructions whose size is over estimated.
1006    
1007      Allen came up with the idea of letting the size of span
1008      dependent instructions be non-monotonic, for a maxIter
1009      number of times, after which the size must be monotonically
1010      increasing.
1011    
1012      This table shows the number of span-dependent instructions
1013      whose size was over-estimated as a function of maxIter, for the
1014      file Parse/parse/ml.grm.sml:
1015    
1016         maxIter            # of instructions:
1017            10                      687
1018            20                      438
1019            30                      198
1020            40                        0
1021    
1022      In compiling the compiler, there is no significant difference in
1023      compilation speed between maxIter=10 and maxIter=40. Actually,
1024      my measurements showed that maxIter=40 was a tad faster than
1025      maxIter=10! Also 96% of the  files in the compiler reach a fix
1026      point within 13 iterations, so fixing maxIter at 40, while high,
1027      is okay.
1028    
1029    ----------------------------------------------------------------------
1030    Name: Matthias Blume
1031    Date: 2001/10/31 15:25:00 EST
1032    Tag: blume-20011031-pgraph
1033    Description:
1034    
1035    CKIT:
1036    * Changed the "Function" constructor of type Ast.ctype to carry optional
1037      argument identifiers.
1038    * Changed the return type of TypeUtil.getFunction accordingly.
1039    * Type equality ignores the argument names.
1040    * TypeUtil.composite tries to preserve argument names but gives up quickly
1041      if there is a mismatch.
1042    
1043    installation script:
1044    * attempts to use "curl" if available (unless "wget" is available as well)
1045    
1046    CM:
1047    * has an experimental implementation of "portable graphs" which I will
1048      soon propose as an implementation-independent library format
1049    * there are also new libraries $/pgraph.cm and $/pgraph-util.cm
1050    
1051    NLFFI-LIB:
1052    * some cleanup (all cosmetic)
1053    
1054    NLFFIGEN:
1055    * temporarily disabled the mechanism that suppresses ML output for
1056      C definitions whose identifiers start with an underscore character
1057    * generate val bindings for enum constants
1058    * user can request that only one style (light or heavy) is being used;
1059      default is to use both (command-line arguments: -heavy and -light)
1060    * fixed bug in handling of function types involving incomplete pointers
1061    * generate ML entry points that take record arguments (i.e., using
1062      named arguments) for C functions that have a prototype with named
1063      arguments
1064      (see changes to CKIT)
1065    
1066    ----------------------------------------------------------------------
1067    Name: Allen Leung
1068    Date: 2001/10/27 20:34:00 EDT
1069    Tag: leunga-20011027-x86-fast-fp-call
1070    Description:
1071    
1072       Fixed the bug described in blume-20010920-slowfp.
1073    
1074       The fix involves
1075          1. generating FCOPYs in FSTP in ia32-svid
1076          2. marking a CALL with the appropriate annotation
1077    
1078    ----------------------------------------------------------------------
1079    Name: Matthias Blume
1080    Date: 2001/10/16 11:32:00 EDT
1081    Tag: blume-20011016-netbsd
1082    Description:
1083    
1084    Underscore patch from Chris Richards (fixing problem with compiling
1085    runtime system under recent NetBSD).
1086    
1087    ----------------------------------------------------------------------
1088    Name: Allen Leung
1089    Date: 2001/10/12 17:18:32 EDT 2001
1090    Tag: leung-20011012-x86-printflowgraph
1091    Description:
1092    
1093    X86RA now uses a valid (instead of dummy) PrintFlowgraph module.
1094    
1095    ----------------------------------------------------------------------
1096    Name: Lal George
1097    Date: 2001/10/11 23:51:34 EDT
1098    Tag: george-20011011-too-many-instrs
1099    Description:
1100    
1101    The representation of a program point never expected to see more
1102    than 65536 instructions in a basic block!
1103    
1104    ----------------------------------------------------------------------
1105    Name: Lal George
1106    Date: 2001/10/09 09:41:37 EDT
1107    Tag: george-20011008-mlrisc-labels
1108    Description:
1109    
1110    Changed the machine description files to support printing of
1111    local and global labels in assembly code, based on host assembler
1112    conventions.
1113    
1114    ----------------------------------------------------------------------
1115    Name: Matthias Blume
1116    Date: 2001/09/25 15:25:00 EDT
1117    Tag: blume-20010925-exninfo
1118    Description:
1119    
1120    I provided a non-hook implementation of exnName (at the toplevel) and
1121    made the "dummy" implementation of exnMessage (at the toplevel) more
1122    useful: if nothing gets "hooked in", then at least you are going to
1123    see the exception name and a message indicating why you don't see more.
1124    
1125    [For the time being, programs that need exnMessage and want to use
1126    ml-build should either use General.exnMessage (strongly recommended) or
1127    refer to structure General at some other point so that CM sees a
1128    static dependency.]
1129    
1130    [Similar remarks go for "print" and "use":  If you want to use their
1131    functionality in stand-alone programs generated by ml-build, then use
1132    TextIO.output and Backend.Interact.useFile (from $smlnj/compiler.cm).]
1133    
1134    ----------------------------------------------------------------------
1135    Name: Matthias Blume
1136    Date: 2001/09/20 17:28:00 EDT
1137    Tag: blume-20010920-slowfp
1138    Description:
1139    
1140    Allen says that x86-fast-fp is not safe yet, so I turned it off again...
1141    
1142    ----------------------------------------------------------------------
1143    Name: Matthias Blume
1144    Date: 2001/09/20 17:20:00 EDT
1145    Tag: blume-20010920-canonicalpaths
1146    Description:
1147    
1148    0. Updated the BOOT file (something that I forgot to do earlier).
1149    
1150    1. Small internal change to CM so that it avoids "/../" in filenames
1151       as much as possible (but only where it is safe).
1152    
1153    2. Changed config/_run-sml (resulting in a changed bin/.run-sml) so
1154       that arguments that contain delimiters are passed through correctly.
1155       This change also means that all "special" arguments of the form
1156       @SMLxxx... must come first.
1157    
1158    3. Changed install script to put relative anchor names for tool commands
1159       into pathconfig.
1160    
1161    ----------------------------------------------------------------------
1162    Name: Matthias Blume
1163    Date: 2001/09/18 15:35:00 EDT
1164    Tag: blume-20010918-readme11036
1165    Description:
1166    
1167    Added README files.
1168    
1169    ----------------------------------------------------------------------
1170    Name: Matthias Blume
1171    Date: 2001/09/18 11:45:00 EDT
1172    Tag: Release_110_36 (retag)
1173    Description:
1174    
1175    Fixed mistake in config/preloads. Retagged as 110.36.
1176    
1177    ----------------------------------------------------------------------
1178    Name: Matthias Blume
1179    Date: 2001/09/18 09:40:00 EDT
1180    Tag: Release_110_36_orig (tag changed)
1181    Description:
1182    
1183    New version (110.36).  New bootfiles.
1184    
1185    ----------------------------------------------------------------------
1186    Name: Matthias Blume
1187    Date: 2001/09/14 16:15:00 EDT
1188    Tag: blume-20010914-x86fastfp
1189    Description:
1190    
1191    John committed some changes that Allen made, in particular a (hopefully)
1192    correctly working version of the x86-fp module.
1193    
1194    I changed the default setting of the Control.MLRISC.getFlag "x86-fast-fp"
1195    flag to "true".  Everything seems to compile to a fixpoint ok, and
1196    "mandelbrot" speeds up by about 15%.
1197    
1198    ----------------------------------------------------------------------
1199    Name: Matthias Blume
1200    Date: 2001/09/13 11:20:00 EDT
1201    Tag: blume-20010913-minimal
1202    Description:
1203    
1204    1. Stefan Monnier's patch to fix a miscompilation problem that
1205       was brought to light by John Reppy's work on Moby.
1206    
1207    2. Implemented a minimal "structure Compiler" that contains just
1208       "version" and "architecture".  The minimal version will be
1209       available when the full version is not.  This is for backward-
1210       compatibility with code that wants to test Compiler.version.
1211    
1212    ----------------------------------------------------------------------
1213    Name: Matthias Blume
1214    Date: 2001/08/28 14:03:00 EDT
1215    Tag: blume-20010828-ml-lex
1216    Description:
1217    
1218    Fix for bug 1581, received from Neophytos Michael.
1219    
1220    ----------------------------------------------------------------------
1221    Name: Matthias Blume
1222    Date: 2001/08/27 11:20:00 EDT
1223    Tag: blume-20010827-readme11035
1224    Description:
1225    
1226    Fleshed out the README file for 110.35.
1227    
1228    ----------------------------------------------------------------------
1229    Name: Matthias Blume
1230    Date: 2001/08/24 17:10:00 EDT
1231    Tag: Release_110_35
1232    Description:
1233    
1234    New version number (110.35).  New bootfiles.
1235    
1236    ----------------------------------------------------------------------
1237    Name: Lal George
1238    Date: 2001/08/24 13:47:18 EDT 2001
1239    Tag: george-20010824-MLRISC-graphs
1240    Description:
1241    
1242     removed clusters from MLRISC completely and replaced with graphs.
1243    
1244    ----------------------------------------------------------------------
1245    Name: Matthias Blume
1246    Date: 2001/08/23 17:50:00 EDT
1247    Tag: blume-20010823-toplevel
1248    Description:
1249    
1250    - some reorganization of the code that implements various kinds of
1251      environments in the compiler (static, dynamic, symbolic, combined)
1252    - re-implemented the EnvRef module so that evalStream works properly
1253      (if the stream contains references to "use", "CM.make", etc.)
1254    - cleaned up evalloop.sml and interact.sml (but they need more cleaning)
1255    
1256    ----------------------------------------------------------------------
1257    Name: Matthias Blume
1258    Date: 2001/08/20 15:50 EDT
1259    Tag: blume20010820-slipup
1260    Description:
1261    
1262    I forgot to commit a few files.  Here they are...
1263    
1264    ----------------------------------------------------------------------
1265    Name: Matthias Blume
1266    Date: 2001/08/20 15:35:00 EDT
1267    Tag: blume-20010820-debugprof
1268    Description:
1269    
1270    !!!! NEW BOOTFILES !!!!
1271    
1272    This is another round of reorganizing the compiler sources.  This
1273    time the main goal was to factor out all the "instrumentation"
1274    passes (for profiling and backtracing) into their own library.
1275    The difficulty was to do it in such a way that it does not depend
1276    on elaborate.cm but only on elabdata.cm.
1277    
1278    Therefore there have been further changes to both elaborate.cm and
1279    elabdata.cm -- more "generic" things have been moved from the former
1280    to the latter.  As a result, I was forced to split the assignment
1281    of numbers indicating "primtyc"s into two portions: SML-generic and
1282    SML/NJ-specific.  Since it would have been awkward to maintain,
1283    I bit the bullet and actually _changed_ the mapping between these
1284    numbers and primtycs.  The bottom line of this is that you need
1285    a new set of bin- and bootfiles.
1286    
1287    I have built new bootfiles for all architectures, so doing a fresh
1288    checkout and config/install.sh should be all you need.
1289    
1290    The newly created library's name is
1291    
1292        $smlnj/viscomp/debugprof.cm
1293    
1294    and its sources live under
1295    
1296        src/compiler/DebugProf
1297    
1298    ----------------------------------------------------------------------
1299    Name: Matthias Blume
1300    Date: 2001/08/15 17:15:00 EDT
1301    Tag: blume-20010815-compreorg
1302    Description:
1303    
1304    This is a first cut at reorganizing the CM libraries that make up the
1305    core of the compiler.  The idea is to separate out pieces that could
1306    be used independently by tools, e.g., the parser, the typechecker, etc.
1307    
1308    The current status is a step in this direction, but it is not quite
1309    satisfactory yet.  Expect more changes in the future.
1310    
1311    Here is the current (new) organization...
1312    
1313        What used to be $smlnj/viscomp/core.cm is now divided into
1314        six CM libraries:
1315    
1316             $smlnj/viscomp/basics.cm
1317                           /parser.cm
1318                           /elabdata.cm
1319                           /elaborate.cm
1320                           /execute.cm
1321                           /core.cm
1322    
1323        The CM files for these libraries live under src/system/smlnj/viscomp.
1324        All these libraries are proxy libraries that contain precisely
1325        one CM library component.  Here are the locations of the components
1326        (all within the src/compiler tree):
1327    
1328             Basics/basics.cm
1329             Parse/parser.cm
1330             ElabData/elabdata.cm
1331             Elaborator/elaborate.cm
1332             Execution/execute.cm
1333             core.cm
1334    
1335         [This organization is the same that has been used already
1336         for a while for the architecture-specific parts of the visible
1337         compiler and for the old version of core.cm.]
1338    
1339         As you will notice, many source files have been moved from their
1340         respective original locations to a new home in one of the above
1341         subtrees.
1342    
1343         The division of labor between the new libraries is the following:
1344    
1345             basics.cm:
1346                - Simple, basic definitions that pertain to many (or all) of
1347                  the other libraries.
1348             parser.cm:
1349                - The SML parser, producing output of type Ast.dec.
1350                - The type family for Ast is also defined and exported here.
1351             elabdata.cm:
1352                - The datatypes that describe input and output of the elaborator.
1353                  This includes types, absyn, and static environments.
1354             elaborator.cm:
1355                - The SML/NJ type checker and elaborator.
1356                  This maps an Ast.dec (with a given static environment) to
1357                  an Absyn.dec (with a new static environment).
1358                - This libraries implements certain modules that used to be
1359                  structures as functors (to remove dependencies on FLINT).
1360             execute.cm:
1361                - Everything having to do with executing binary code objects.
1362                - Dynamic environments.
1363             core.cm:
1364                - SML/NJ-specific instantiations of the elaborator and MLRISC.
1365                - Top-level modules.
1366                - FLINT (this should eventually become its own library)
1367    
1368    Notes:
1369    
1370    I am not 100% happy with the way I separated the elaborator (and its
1371    data structures) from FLINT.  Two instances of the same problem:
1372    
1373        1. Data structures contain certain fields that carry FLINT-specific
1374           information.  I hacked around this using exn and the property list
1375           module from smlnj-lib.  But the fact that there are middle-end
1376           specific fields around at all is a bit annoying.
1377    
1378        2. The elaborator calculates certain FLINT-related information.  I tried
1379           to make this as abstract as I could using functorization, but, again,
1380           the fact that the elaborator has to perform calculations on behalf
1381           of the middle-end at all is not nice.
1382    
1383        3. Having to used exn and property lists is unfortunate because it
1384           weakens type checking.  The other alternative (parameterizing
1385           nearly *everything*) is not appealing, though.
1386    
1387    I removed the "rebinding =" warning hack because due to the new organization
1388    it was awkward to maintain it.  As a result, the compiler now issues some of
1389    these warnings when compiling init.cmi during bootstrap compilation. On
1390    the plus side, you also get a warning when you do, for example:
1391       val op = = Int32.+
1392    which was not the case up to now.
1393    
1394    I placed "assign" and "deref" into the _Core structure so that the
1395    code that deals with the "lazy" keyword can find them there.  This
1396    removes the need for having access to the primitive environment
1397    during elaboration.
1398    
1399    ----------------------------------------------------------------------
1400    Name: Matthias Blume
1401    Date: 2001/08/13
1402    Tag: blume-20010813-closures
1403    Description:
1404    
1405    This fix was sent to us by Zhong Shao.  It is supposed to improve the
1406    performance of certain loops by avoiding needless closure allocation.
1407    
1408    ----------------------------------------------------------------------
1409    Name: Lal George
1410    Date: 2001/07/31 10:03:23 EDT 2001
1411    Tag: george-20010731-x86-fmalloc
1412    Description: Fixed bug in x86 calls
1413    
1414        There was a bug where call instructions would mysteriously
1415        vanish. The call instruction had to be one that returned
1416        a floating point value.
1417    
1418    ----------------------------------------------------------------------
1419    Name: Lal George
1420    Date: 2001/07/19 16:36:29 EDT 2001
1421    Tag: george-20010719-simple-cells
1422    Description:
1423    
1424    I have dramatically simplified the interface for CELLS in MLRISC.
1425    
1426    In summary, the cells interface is broken up into three parts:
1427    
1428      1. CellsBasis : CELLS_BASIS
1429    
1430            CellsBasis is a top level structure and common for all
1431            architectures.  it contains the definitions of basic datatypes
1432            and utility  functions over these types.
1433    
1434      2. functor Cells() : CELLS
1435    
1436            Cells generates an interface for CELLS that incorporates the
1437            specific resources on the target architecture, such as the
1438            presence of special register classes, their number and size,
1439            and various useful substructures.
1440    
1441      3. <ARCH>CELLS
1442    
1443            e.g. SparcCells: SPARCCELLS
1444    
1445            <ARCH>CELLS usually contains additional bindings for special
1446            registers  on the architecture, such as:
1447    
1448                    val r0 : cell           (* register zero *)
1449                    val y : cell            (* Y register *)
1450                    val psr : cell          (* processor status register *)
1451                    ...
1452    
1453            The structure returned by applying the Cells functor is opened
1454            in this interface.
1455    
1456    The main implication of all this is that the datatypes for cells is
1457    split between CellsBasis and CELLS -- a fairly simple change for user
1458    code.
1459    
1460    In the old scheme the CELLS interface had a definitional binding of
1461    the form:
1462    
1463            signature CELLS = sig
1464    
1465               structure CellsBasis = CellsBasis
1466    
1467               ...
1468    
1469            end
1470    
1471    With all the sharing constraints that goes on in MLRISC, this old
1472    design  quickly leads to errors such as:
1473    
1474            "structure definition spec inside of sharing ... "
1475    
1476    
1477    and appears to require an unacceptable amount of sharing and where
1478    constraint hackery.
1479    
1480    I think this error message (the interaction of definitional specs and
1481    sharing) requires more explanation on our web page.
1482    
1483    ----------------------------------------------------------------------
1484    Name: Matthias Blume
1485    Date: 2001/07/19 15:00:00 EDT
1486    Tag: blume-20010719-libreorg
1487    Description:
1488    
1489    This update puts together a fairly extensive but straightforward change
1490    to the way the libraries that implement the interactive system are
1491    organized:
1492    
1493       The biggest change is the elimination of structure Compiler.  As a
1494       replacement for this structure, there is now a CM library
1495       (known as $smlnj/compiler.cm or $smlnj/compiler/current.cm)
1496       that exports all the substructures of the original structure Compiler
1497       directly.  So instead of saying Compiler.Foo.bar one now simply
1498       says Foo.bar.  (The CM libraries actually export a collection of
1499       structures that is richer than the collection of substructures of
1500       structure Compiler.)
1501    
1502       To make the transition smooth, there is a separate library called
1503       $smlnj/compiler/compiler.cm which puts together and exports the
1504       original structure Compiler (or at least something very close to it).
1505    
1506       There are five members of the original structure Compiler
1507       that are not exported directly but which instead became members
1508       of a new structure Backend (described by signature BACKEND).  These are:
1509       structure Profile (: PROFILE), structure Compile (: COMPILE), structure
1510       Interact (: INTERACT), structure Machine (: MACHINE), and val
1511       architecture (: string).
1512    
1513       Structure Compiler.Version has become structure CompilerVersion.
1514    
1515       Cross-compilers for alpha32, hppa, ppc, sparc, and x86 are provided
1516       by $smlnj/compiler/<arch>.cm where <arch> is alpha32, hppa, ppc, sparc,
1517       or x86, respectively.
1518       Each of these exports the same frontend structures that
1519       $smlnj/compiler.cm exports.  But they do not have a structure Backend
1520       and instead export some structure <Arch>Backend where <Arch> is Alpha32,
1521       Hppa, PPC, Sparc, or X86, respectively.
1522    
1523       Library $smlnj/compiler/all.cm exports the union of the exports of
1524       $smlnj/compiler/<arch>.cm
1525    
1526       There are no structures <Arch>Compiler anymore, use
1527       $smlnj/compiler/<arch>.cm instead.
1528    
1529       Library host-compiler-0.cm is gone.  Instead, the internal library
1530       that instantiates CM is now called cm0.cm.  Selection of the host
1531       compiler (backend) is no longer done here but. (Responsibility for it
1532       now lies with $smlnj/compiler/current.cm.  This seems to be more
1533       logical.)
1534    
1535       Many individual files have been moved or renamed.  Some files have
1536       been split into multiple files, and some "dead" files have been deleted.
1537    
1538    Aside from these changes to library organization, there are also changes
1539    to the way the code itself is organized:
1540    
1541       Structure Binfile has been re-implemented in such a way that it no
1542       longer needs any knowledge of the compiler.  It exclusively deals
1543       with the details of binfile layout.  It no longer invokes the
1544       compiler (for the purpose of creating new prospective binfile
1545       content), and it no longer has any knowledge of how to interpret
1546       pickles.
1547    
1548       Structure Compile (: COMPILE) has been stripped down to the bare
1549       essentials of compilation.  It no longer deals with linking/execution.
1550       The interface has been cleaned up considerably.
1551    
1552       Utility routines for dealing with linking and execution have been
1553       moved into their own substructures.
1554    
1555       (The ultimate goal of these changes is to provide a light-weight
1556       binfile loader/linker (at least for, e.g., stable libraries) that
1557       does not require CM or the compiler to be present.)
1558    
1559    CM documentation has been updated to reflect the changes to library
1560    organization.
1561    
1562    ----------------------------------------------------------------------
1563    Name: Matthias Blume
1564    Date: 2001/07/10 17:30:00 EDT
1565    Tag: Release_110_34
1566    Description:
1567    
1568    Minor tweak to 110.34 (re-tagged):
1569    
1570      - README.html file added to CVS repository
1571      - runtime compiles properly under FreeBSD 3.X and 4.X
1572    
1573    ----------------------------------------------------------------------
1574    Name: Matthias Blume
1575    Date: 2001/07/10 17:30:00 EDT
1576    Tag: Release_110_34
1577    Description:
1578    
1579    New version number (110.34). New bootfiles.
1580    
1581    ----------------------------------------------------------------------
1582    Name: Matthias Blume
1583    Date: 2001/07/09 16:00:00 EDT
1584    Tag: blume-20010709-more-varargs
1585    Description:
1586    
1587    I changed the handling of varargs in ml-nlffigen again:
1588    The ellipsis ... will now simply be ignored (with an accompanying warning).
1589    
1590    The immediate effect is that you can actually call a varargs function
1591    from ML -- but you can't actually supply any arguments beyond the ones
1592    specified explicitly.  (For example, you can call printf with its format
1593    string, but you cannot pass additional arguments.)
1594    
1595    This behavior is only marginally more useful than the one before, but
1596    it has the advantage that a function or, more importantly, a function
1597    type never gets dropped on the floor, thus avoiding follow-up problems with
1598    other types that refer to the offending one.
1599    
1600    ----------------------------------------------------------------------
1601    Name: Matthias Blume
1602    Date: 2001/07/09 11:25:00 EDT
1603    Tag: blume-20010709-varargs
1604    Description:
1605    
1606    1. ckit-lib.cm now exports structure Error
1607    2. ml-nlffigen reports occurences of "..." (i.e., varargs function types)
1608       with a warning accompanied by a source location.  Moreover, it
1609       merely skips the offending function or type and proceeds with the
1610       rest of its work.u  As a result, one can safely feed C code containing
1611       "..." to ml-nlffigen.
1612    3. There are some internal improvements to CM, providing slightly
1613       more general string substitutions in the tools subsystem.
1614    
1615    ----------------------------------------------------------------------
1616    Name: Matthias Blume
1617    Date: 2001/06/27 15:10:00 EDT
1618    Tag: blume-20010627-concur
1619    Description:
1620    
1621    Fixed a small bug in CM's handling of parallel compilation.
1622    (You could observe the bug by Control-C-interrupting an ordinary
1623    CMB.make or CM.stabilize and then attaching some compile servers.
1624    The result was that all of a sudden the previously interrupted
1625    compilation would continue on its own.  This was because of
1626    an over-optimization: CM did not bother to clean out certain queues
1627    when no servers were attached "anyway", resulting in the contents
1628    of these queues to grab control when new servers did get attached.)
1629    
1630    There is also another minor update to the CM manual.
1631    
1632    ----------------------------------------------------------------------
1633    Name: Matthias Blume
1634    Date: 2001/06/26 16:15:00 EDT
1635    Tag: blume-20010626-cmdoc
1636    Description:
1637    
1638    Minor typo fixed in CM manual (syntax diagram for libraries).
1639    
1640    ----------------------------------------------------------------------
1641    Name: Matthias Blume
1642    Date: 2001/06/25 22:55:00 EDT
1643    Tag: blume-20010625-x86pc
1644    Description:
1645    
1646    Fixed a nasty bug in the X86 assembly code that caused signal
1647    handlers to fail (crash) randomly.
1648    
1649    ----------------------------------------------------------------------
1650    Name: Matthias Blume
1651  Date: 2001/06/25 12:05:00 EDT  Date: 2001/06/25 12:05:00 EDT
1652  Tag: blume-20010625-nlffigen  Tag: blume-20010625-nlffigen
1653  Description:  Description:
# Line 2502  Line 4136 
4136       elaborator). There were a lot of changes during my "linkpath" trials       elaborator). There were a lot of changes during my "linkpath" trials
4137       that could have been reverted to their original state but weren't.       that could have been reverted to their original state but weren't.
4138       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
4139       than what was strictly necessary...  (I _did_ resist the tempation       than what was strictly necessary...  (I _did_ resist the temptation
4140       of doing any "global reformatting" to avoid an untimely death at       of doing any "global reformatting" to avoid an untimely death at
4141       Dave's hands. :)       Dave's hands. :)
4142    

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