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Diff of /sml/trunk/HISTORY

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revision 758, Fri Dec 22 04:12:36 2000 UTC revision 1098, Wed Feb 27 17:29:47 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
17    Date: 2002/02/27 12:29:00 EST
18    Tag: blume-20020227-cdebug
19    Description:
20    
21    - made types in structure C and C_Debug to be equal
22    - got rid of code duplication (c-int.sml vs. c-int-debug.sml)
23    - there no longer is a C_Int_Debug (C_Debug is directly derived from C)
24    
25    ----------------------------------------------------------------------
26    Name: Matthias Blume
27    Date: 2002/02/26 12:00:00 EST
28    Tag: blume-20020226-ffi
29    Description:
30    
31    1. Fixed a minor bug in CM's "noweb" tool:
32       If numbering is turned off, then truly don't number (i.e., do not
33       supply the -L option to noweb).  The previous behavior was to supply
34       -L'' -- which caused noweb to use the "default" line numbering scheme.
35       Thanks to Chris Richards for pointing this out (and supplying the fix).
36    
37    2. Once again, I reworked some aspects of the FFI:
38    
39       A. The incomplete/complete type business:
40    
41       - Signatures POINTER_TO_INCOMPLETE_TYPE and accompanying functors are
42         gone!
43       - ML types representing an incomplete type are now *equal* to
44         ML types representing their corresponding complete types (just like
45         in C).  This is still safe because ml-nlffigen will not generate
46         RTTI for incomplete types, nor will it generate functions that
47         require access to such RTTI.   But when ML code generated from both
48         incomplete and complete versions of the C type meet, the ML types
49         are trivially interoperable.
50    
51         NOTE:  These changes restore the full generality of the translation
52         (which was previously lost when I eliminated functorization)!
53    
54       B. Enum types:
55    
56       - Structure C now has a type constructor "enum" that is similar to
57         how the "su" constructor works.  However, "enum" is not a phantom
58         type because each "T enum" has values (and is isomorphic to
59         MLRep.Signed.int).
60       - There are generic access operations for enum objects (using
61         MLRep.Signed.int).
62       - ml-nlffigen will generate a structure E_foo for each "enum foo".
63         * The structure contains the definition of type "mlrep" (the ML-side
64         representation type of the enum).  Normally, mlrep is the same
65         as "MLRep.Signed.int", but if ml-nlffigen was invoked with "-ec",
66         then mlrep will be defined as a datatype -- thus facilitating
67         pattern matching on mlrep values.
68         ("-ec" will be suppressed if there are duplicate values in an
69          enumeration.)
70         * Constructors ("-ec") or values (no "-ec") e_xxx of type mlrep
71         will be generated for each C enum constant xxx.
72         * Conversion functions m2i and i2m convert between mlrep and
73         MLRep.Signed.int.  (Without "-ec", these functions are identities.)
74         * Coversion functions c and ml convert between mlrep and "tag enum".
75         * Access functions (get/set) fetch and store mlrep values.
76       - By default (unless ml-nlffigen was invoked with "-nocollect"), unnamed
77         enumerations are merged into one single enumeration represented by
78         structure E_'.
79    
80    ----------------------------------------------------------------------
81    Name: Allen Leung
82    Date: 2002/02/25 04:45:00 EST
83    Tag: leunga-20020225-cps-spill
84    
85    This is a new implementation of the CPS spill phase.
86    The new phase is in the new file compiler/CodeGen/cpscompile/spill-new.sml
87    In case of problems, replace it with the old file spill.sml
88    
89    The current compiler runs into some serious performance problems when
90    constructing a large record.  This can happen when we try to compile a
91    structure with many items.  Even a very simple structure like the following
92    makes the compiler slow down.
93    
94        structure Foo = struct
95           val x_1 = 0w1 : Word32.int
96           val x_2 = 0w2 : Word32.int
97           val x_3 = 0w3 : Word32.int
98           ...
99           val x_N = 0wN : Word32.int
100        end
101    
102    The following table shows the compile time, from N=1000 to N=4000,
103    with the old compiler:
104    
105    N
106    1000   CPS 100 spill                           0.04u  0.00s  0.00g
107           MLRISC ra                               0.06u  0.00s  0.05g
108              (spills = 0 reloads = 0)
109           TOTAL                                   0.63u  0.07s  0.21g
110    
111    1100   CPS 100 spill                           8.25u  0.32s  0.64g
112           MLRISC ra                               5.68u  0.59s  3.93g
113              (spills = 0 reloads = 0)
114           TOTAL                                   14.71u  0.99s  4.81g
115    
116    1500   CPS 100 spill                           58.55u  2.34s  1.74g
117           MLRISC ra                               5.54u  0.65s  3.91g
118              (spills = 543 reloads = 1082)
119           TOTAL                                   65.40u  3.13s  6.00g
120    
121    2000   CPS 100 spill                           126.69u  4.84s  3.08g
122           MLRISC ra                               0.80u  0.10s  0.55g
123              (spills = 42 reloads = 84)
124           TOTAL                                   129.42u  5.10s  4.13g
125    
126    3000   CPS 100 spill                           675.59u  19.03s  11.64g
127           MLRISC ra                               2.69u  0.27s  1.38g
128              (spills = 62 reloads = 124)
129           TOTAL                                   682.48u  19.61s  13.99g
130    
131    4000   CPS 100 spill                           2362.82u  56.28s  43.60g
132           MLRISC ra                               4.96u  0.27s  2.72g
133              (spills = 85 reloads = 170)
134           TOTAL                                   2375.26u  57.21s  48.00g
135    
136    As you can see the old cps spill module suffers from some serious
137    performance problem but since I cannot decipher the old code fully,
138    innstead of patching the problems up, I'm reimplementing it
139    with a different algorithm.  The new code is more modular,
140    smaller when compiled, and substantially faster
141    (O(n log n) time and O(n) space).  Timing of the new spill module:
142    
143    4000  CPS 100 spill                           0.02u  0.00s  0.00g
144          MLRISC ra                               0.25u  0.02s  0.15g
145             (spills=1 reloads=3)
146          TOTAL                                   7.74u  0.34s  1.62g
147    
148    Implementation details:
149    
150    As far as I can tell, the purpose of the CPS spill module is to make sure the
151    number of live variables at any program point (the bandwidth)
152    does not exceed a certain limit, which is determined by the
153    size of the spill area.
154    
155    When the bandwidth is too large, we decrease the register pressure by
156    packing live variables into spill records.  How we achieve this is
157    completely different than what we did in the old code.
158    
159    First, there is something about the MLRiscGen code generator
160    that we should be aware of:
161    
162    o MLRiscGen performs code motion!
163    
164       In particular, it will move floating point computations and
165       address computations involving only the heap pointer to
166       their use sites (if there is only a single use).
167       What this means is that if we have a CPS record construction
168       statement
169    
170           RECORD(k,vl,w,e)
171    
172       we should never count the new record address w as live if w
173       has only one use (which is often the case).
174    
175       We should do something similar to floating point, but the transformation
176       there is much more complex, so I won't deal with that.
177    
178    Secondly, there are now two new cps primops at our disposal:
179    
180     1. rawrecord of record_kind option
181        This pure operator allocates some uninitialized storage from the heap.
182        There are two forms:
183    
184         rawrecord NONE [INT n]  allocates a tagless record of length n
185         rawrecord (SOME rk) [INT n] allocates a tagged record of length n
186                                     and initializes the tag.
187    
188     2. rawupdate of cty
189          rawupdate cty (v,i,x)
190          Assigns to x to the ith component of record v.
191          The storelist is not updated.
192    
193    We use these new primops for both spilling and increment record construction.
194    
195     1. Spilling.
196    
197        This is implemented with a linear scan algorithm (but generalized
198        to trees).  The algorithm will create a single spill record at the
199        beginning of the cps function and use rawupdate to spill to it,
200        and SELECT or SELp to reload from it.  So both spills and reloads
201        are fine-grain operations.  In contrast, in the old algorithm
202        "spills" have to be bundled together in records.
203    
204        Ideally, we should sink the spill record construction to where
205        it is needed.  We can even split the spill record into multiple ones
206        at the places where they are needed.  But CPS is not a good
207        representation for global code motion, so I'll keep it simple and
208        am not attempting this.
209    
210     2. Incremental record construction (aka record splitting).
211    
212        Long records with many component values which are simulatenously live
213        (recall that single use record addresses are not considered to
214         be live) are constructed with rawrecord and rawupdate.
215        We allocate space on the heap with rawrecord first, then gradually
216        fill it in with rawupdate.  This is the technique suggested to me
217        by Matthias.
218    
219        Some restrictions on when this is applicable:
220        1. It is not a VECTOR record.  The code generator currently does not handle
221           this case. VECTOR record uses double indirection like arrays.
222        2. All the record component values are defined in the same "basic block"
223           as the record constructor.  This is to prevent speculative
224           record construction.
225    
226    ----------------------------------------------------------------------
227    Name: Allen Leung
228    Date: 2002/02/22 01:02:00 EST
229    Tag: leunga-20020222-mlrisc-tools
230    
231    Minor bug fixes in the parser and rewriter
232    
233    ----------------------------------------------------------------------
234    Name: Allen Leung
235    Date: 2002/02/21 20:20:00 EST
236    Tag: leunga-20020221-peephole
237    
238    Regenerated the peephole files.  Some contained typos in the specification
239    and some didn't compile because of pretty printing bugs in the old version
240    of 'nowhere'.
241    
242    ----------------------------------------------------------------------
243    Name: Allen Leung
244    Date: 2002/02/19 20:20:00 EST
245    Tag: leunga-20020219-mlrisc-tools
246    Description:
247    
248       Minor bug fixes to the mlrisc-tools library:
249    
250       1.  Fixed up parsing colon suffixed keywords
251       2.  Added the ability to shut the error messages up
252       3.  Reimplemented the pretty printer and fixed up/improved
253           the pretty printing of handle and -> types.
254       4.  Fixed up generation of literal symbols in the nowhere tool.
255       5.  Added some SML keywords to to sml.sty
256    
257    ----------------------------------------------------------------------
258    Name: Matthias Blume
259    Date: 2002/02/19 16:20:00 EST
260    Tag: blume-20020219-cmffi
261    Description:
262    
263    A wild mix of changes, some minor, some major:
264    
265    * All C FFI-related libraries are now anchored under $c:
266        $/c.cm      --> $c/c.cm
267        $/c-int.cm  --> $c/internals/c-int.cm
268        $/memory.cm --> $c/memory/memory.cm
269    
270    * "make" tool (in CM) now treats its argument pathname slightly
271      differently:
272        1. If the native expansion is an absolute name, then before invoking
273           the "make" command on it, CM will apply OS.Path.mkRelative
274           (with relativeTo = OS.FileSys.getDir()) to it.
275        2. The argument will be passed through to subsequent phases of CM
276           processing without "going native".  In particular, if the argument
277           was an anchored path, then "make" will not lose track of that anchor.
278    
279    * Compiler backends now "know" their respective C calling conventions
280      instead of having to be told about it by ml-nlffigen.  This relieves
281      ml-nlffigen from one of its burdens.
282    
283    * The X86Backend has been split into X86CCallBackend and X86StdCallBackend.
284    
285    * Export C_DEBUG and C_Debug from $c/c.cm.
286    
287    * C type encoding in ml-nlffi-lib has been improved to model the conceptual
288      subtyping relationship between incomplete pointers and their complete
289      counterparts.  For this, ('t, 'c) ptr has been changed to 'o ptr --
290      with the convention of instantiating 'o with ('t, 'c) obj whenever
291      the pointer target type is complete.  In the incomplete case, 'o
292      will be instantiated with some "'c iobj" -- a type obtained by
293      using one of the functors PointerToIncompleteType or PointerToCompleteType.
294    
295      Operations that work on both incomplete and complete pointer types are
296      typed as taking an 'o ptr while operations that require the target to
297      be known are typed as taking some ('t, 'c) obj ptr.
298    
299      voidptr is now a bit "more concrete", namely "type voidptr = void ptr'"
300      where void is an eqtype without any values.  This makes it possible
301      to work on voidptr values using functions meant to operate on light
302      incomplete pointers.
303    
304    * As a result of the above, signature POINTER_TO_INCOMPLETE_TYPE has
305      been vastly simplified.
306    
307    ----------------------------------------------------------------------
308    Name: Matthias Blume
309    Date: 2002/02/19 10:48:00 EST
310    Tag: blume-20020219-pqfix
311    Description:
312    
313    Applied Chris Okasaki's bug fix for priority queues.
314    
315    ----------------------------------------------------------------------
316    Name: Matthias Blume
317    Date: 2002/02/15 17:05:00
318    Tag: Release_110_39
319    Description:
320    
321    Last-minute retagging is becoming a tradition... :-(
322    
323    This is the working release 110.39.
324    
325    ----------------------------------------------------------------------
326    Name: Matthias Blume
327    Date: 2002/02/15 16:00:00 EST
328    Tag: Release_110_39-orig
329    Description:
330    
331    Working release 110.39.  New bootfiles.
332    
333    (Update: There was a small bug in the installer so it wouldn't work
334    with all shells.  So I retagged. -Matthias)
335    
336    ----------------------------------------------------------------------
337    Name: Matthias Blume
338    Date: 2002/02/15 14:17:00 EST
339    Tag: blume-20020215-showbindings
340    Description:
341    
342    Added EnvRef.listBoundSymbols and CM.State.showBindings.  Especially
343    the latter can be useful for exploring what bindings are available at
344    the interactive prompt.  (The first function returns only the list
345    of symbols that are really bound, the second prints those but also the
346    ones that CM's autoloading mechanism knows about.)
347    
348    ----------------------------------------------------------------------
349    Name: Matthias Blume
350    Date: 2002/02/15 12:08:00 EST
351    Tag: blume-20020215-iptrs
352    Description:
353    
354    Two improvements to ml-nlffigen:
355    
356      1. Write files only if they do not exist or if their current contents
357         do not coincide with what's being written.  (That is, avoid messing
358         with the time stamps unless absolutely necessary.)
359    
360      2. Implement a "repository" mechanism for generated files related
361         to "incomplete pointer types".   See the README file for details.
362    
363    ----------------------------------------------------------------------
364    Name: Matthias Blume
365    Date: 2002/02/14 11:50:00 EST
366    Tag: blume-20020214-quote
367    Description:
368    
369    Added a type 't t_' to tag.sml (in ml-nlffi-lib.cm).  This is required
370    because of the new and improved tag generation scheme.  (Thanks to Allen
371    Leung for pointing it out.)
372    
373    ----------------------------------------------------------------------
374    Name: Lal George
375    Date: 2002/02/14 09:55:27 EST 2002
376    Tag: george-20020214-isabelle-bug
377    Description:
378    
379    Fixed the MLRISC bug sent by Markus Wenzel regarding the compilation
380    of Isabelle on the x86.
381    
382    From Allen:
383    -----------
384     I've found the problem:
385    
386         in ra-core.sml, I use the counter "blocked" to keep track of the
387         true number of elements in the freeze queue.  When the counter goes
388         to zero, I skip examining the queue.  But I've messed up the
389         bookkeeping in combine():
390    
391             else ();
392             case !ucol of
393               PSEUDO => (if !cntv > 0 then
394                     (if !cntu > 0 then blocked := !blocked - 1 else ();
395                                        ^^^^^^^^^^^^^^^^^^^^^^^
396                      moveu := mergeMoveList(!movev, !moveu)
397                     )
398                  else ();
399    
400         combine() is called to coalesce two nodes u and v.
401         I think I was thinking that if the move counts of u and v are both
402         greater than zero then after they are coalesced then one node is
403         removed from the freeze queue.  Apparently I was thinking that
404         both u and v are of low degree, but that's clearly not necessarily true.
405    
406    
407    02/12/2002:
408        Here's the patch.  HOL now compiles.
409    
410        I don't know how this impact on performance (compile
411        time or runtime).  This bug caused the RA (especially on the x86)
412        to go thru the potential spill phase when there are still nodes on the
413        freeze queue.
414    
415    
416    
417    
418    ----------------------------------------------------------------------
419    Name: Matthias Blume
420    Date: 2002/02/13 22:40:00 EST
421    Tag: blume-20020213-fptr-rtti
422    Description:
423    
424    Fixed a bug in ml-nlffigen that was introduced with one of the previous
425    updates.
426    
427    ----------------------------------------------------------------------
428    Name: Matthias Blume
429    Date: 2002/02/13 16:41:00 EST
430    Tag: blume-20020213-cmlpq
431    Description:
432    
433    Added new priority queue export symbols (which have just been added to
434    smlnj-lib.cm) to CML's version of smlnj-lib.cm.  (Otherwise CML would
435    not compile and the installer would choke.)
436    
437    ----------------------------------------------------------------------
438    Name: Matthias Blume
439    Date: 2002/02/13 16:15:00 EST
440    Tag: blume-20020213-various
441    Description:
442    
443    1. More tweaks to ml-nlffigen:
444    
445       - better internal datastructures (resulting in slight speedup)
446       - "-match" option requires exact match
447       - "localized" gensym counters (untagged structs/unions nested within
448         other structs/unions or within typedefs get a fresh counter; their
449         tag will be prefixed by a concatenation of their parents' tags)
450       - bug fixes (related to calculation of transitive closure of types
451         to be included in the output)
452    
453    2. Minor Basis updates:
454    
455       - added implementations for List.collate and Option.app
456    
457    ----------------------------------------------------------------------
458    Name: Matthias Blume
459    Date: 2002/02/11 15:55:00 EST
460    Tag: blume-20020211-gensym
461    Description:
462    
463    Added a "-gensym" option to command line of ml-nlffigen.  This can be
464    used to specify a "stem" -- a string that is inserted in all "gensym'd"
465    names (ML structure names that correspond to unnamed C structs, unions,
466    and enums), so that separate runs of ml-nlffigen do not clash.
467    
468    ----------------------------------------------------------------------
469    Name: Matthias Blume
470    Date: 2002/02/11 12:05:00 EST
471    Tag: blume-20020211-gensml
472    Description:
473    
474    A quick fix for a problem with GenSML (in the pgraph-util library):
475    Make generation of toplevel "local" optional.  (Strictly speaking,
476    signature definitions within "local" are not legal SML.)
477    
478    Other than that: updates to INSTALL and cm/TODO.
479    
480    ----------------------------------------------------------------------
481    Name: Matthias Blume
482    Date: 2002/02/08 15:00:00 EST
483    Tag: blume-20020208-uniquepid
484    Description:
485    
486    0. Version number has been bumped to 110.38.1.  NEW BOOTFILES!!!
487    
488    1. The installer (config/install.sh) has gotten smarter:
489    
490         - Configuration options are a bit easier to specify now
491           (in config/targets).
492         - Bug in recognizing .tar.bz2 files fixed.
493         - Installer automatically resolves dependencies between
494           configuration options (e.g., if you ask for eXene, you will
495           also get cml -- regardless whether you asked for it or not).
496         - Installer can run in "quieter mode" by setting the environment
497           variable INSTALL_QUIETLY to "true".  "Quieter" does not mean
498           "completely silent", though.
499         - Build HashCons library as part of smlnj-lib.
500    
501    2. A new scheme for assigning persistent identifiers to compilation
502       units (and, by extension, to types etc.) has been put into place.
503       This fixes a long-standing bug where types and even dynamic values
504       can get internally confused, thereby compromising type safety
505       (abstraction) and dynamic correctness.  See
506    
507         http://cm.bell-labs.com/cm/cs/who/blume/pid-confusion.tgz
508    
509       for an example of how things could go wrong until now.
510    
511       The downside of the new scheme is that pids are not quite as
512       persistent as they used to be: CM will generate a fresh pid
513       for every compilation unit that it thinks it sees for the first
514       time.  That means that if you compile starting from a clean, fresh
515       source tree at two different times, you end up with different
516       binaries.
517    
518       Cutoff recompilation, however, has not been compromised because
519       CM keeps pid information in special caches between runs.
520    
521    ----------------------------------------------------------------------
522    Name: Lal George
523    Date: 2002/02/07 15:34:13 EST 2002
524    Tag: <none>
525    Description:
526    
527    Compilers that generate assembly code may produce  global labels
528    whose value is resolved at link time. The various peephole optimization
529    modules did not take this in account.
530    
531    TODO. The Labels.addrOf function should really return an option
532    type so that clients are forced to deal with this issue, rather
533    than an exception being raised.
534    
535    ----------------------------------------------------------------------
536    Name: Lal George
537    Date: 2002/02/06 13:55:02 EST
538    Tag: george-20020206-ra-breakup
539    Description:
540    
541    1. A bug fix from Allen.
542    
543        A typo causes extra fstp %st(0)'s to be generated at compensation
544        edges, which might cause stack underflow traps at runtime.  This
545        occurs in fft where there are extraneous fstps right before the 'into'
546        trap instruction (in this case they are harmless since none of the
547        integers overflow.)
548    
549    2. Pulled out various utility modules that were embedded in the modules
550       of the register allocator. I need these modules for other purposes, but
551       they are not complete enough to put into a library (just yet).
552    ----------------------------------------------------------------------
553    Name: Matthias Blume
554    Date: 2002/01/31 16:05:00 EST
555    Tag: blume-20020131-sparc-ccalls
556    Description:
557    
558    1. C-calls on Sparc needlessly allocated a huge chunk (96 bytes)
559       of extra stack space by mistake.  Fixed.
560    
561    2. Bug in logic of handling of command-line options in ml-nlffigen fixed.
562    
563    ----------------------------------------------------------------------
564    Name: Allen Leung
565    Date: 2002/01/30
566    Tag: leunga-20020130-nowhere-bug-fix
567    Description:
568    
569       MLRISC bug fixes:
570       1. Fixed a bindings computation bug in the 'nowhere' program generator tool.
571       2. MachineInt.fromString was negating its value.
572    
573    ----------------------------------------------------------------------
574    Name: Matthias Blume
575    Date: 2002/01/29
576    Tag: blume-20020129-INSTALL
577    Description:
578    
579    - Added somewhat detailed installation instructions (file INSTALL).
580    - Fixed curl-detection bug in config/install.sh.
581    - It is now possible to select the URL getter using the URLGETTER
582      environment variable:
583    
584          not set / "unknown"      --> automatic detection (script tries wget,
585                                       curl, and lynx)
586          "wget" / "curl" / "lynx" --> use the specified program (script "knows"
587                                       how to properly invoke them)
588          other                    --> use $URLGETTER directly, it must take
589                                       precisely two command-line arguments
590                                       (source URL and destination file name)
591    
592    ----------------------------------------------------------------------
593    Name: Matthias Blume
594    Date: 2002/01/28
595    Tag: blume-20020128-sparc-ccalls
596    Description:
597    
598    - Fixed problem with calculation of "used" registers in sparc-c-calls.
599    - Make use of the allocParam argument in sparc-c-calls.
600    
601    ----------------------------------------------------------------------
602    Name: Matthias Blume
603    Date: 2002/01/28
604    Tag: blume-20020128-allocParam
605    Description:
606    
607    John Reppy:  Changes c-calls API to accept client-callback for
608    allocating extra stack space.
609    me: Corresponding changes to mlriscGen (using a dummy argument that
610        does not change the current behavior).
611    
612    ----------------------------------------------------------------------
613    Name: Matthias Blume
614    Date: 2002/01/28 12:00:00
615    Tag: Release_110_38
616    Description:
617    
618    This time for real!!!
619    
620    ----------------------------------------------------------------------
621    Name: Matthias Blume
622    Date: 2002/01/28 10:56:00 EST
623    Tag: blume-20020128-retraction
624    Description:
625    
626    0. Retracted earlier 110.38.  (The Release_110_38 tag has been replaced
627       with blume-Release_110_38-retracted.)
628    
629    1. Fixed a problem with incorrect rounding modes in real64.sml.
630       (Thanks to Andrew Mccreight <andrew.mccreight@yale.edu>.)
631    
632    2. A bug in ml-nlffigen related to the handling of unnamed structs, unions,
633       and enums fixed.  The naming of corresponding ML identifiers should
634       now be consistent again.
635    
636    ----------------------------------------------------------------------
637    Name: Allen Leung
638    Date: 2002/01/27
639    Tag: leunga-20020127-nowhere
640    Description:
641    
642       Added a target called nowhere in the configuration scripts.
643       Enabling this will build the MLRISC 'nowhere' tool (for translating
644       programs with where-clauses into legal SML code) during installation.
645    
646    ----------------------------------------------------------------------
647    Name: Matthias Blume
648    Date: 2002/01/25 21:27:00 EST
649    Tag: blume-Release_110_38-retracted
650    Description:
651    
652    Call it a (working) release!  Version is 110.38. Bootfiles are ready.
653    
654    README will be added later.
655    
656    !!! NOTE:  Re-tagged as blume-Release_110_38-retracted. Original tag
657    (Release_110_38) removed.  Reason: Last-minute bug fixes.
658    
659    ----------------------------------------------------------------------
660    Name: Matthias Blume
661    Date: 2002/01/25
662    Tag: blume-20020125-ffi
663    Description:
664    
665    A large number of tweaks and improvements to ml-nlffi-lib and
666    ml-nlffigen:
667    
668       - ML represenation types have been streamlined
669       - getter and setter functions work with concrete values, not abstract
670         ones where possible
671       - ml-nlffigen command line more flexible (see README file there)
672       - some bugs have been fixed (hopefully)
673    
674    ----------------------------------------------------------------------
675    Name: Lal George
676    Date: 2002/01/24
677    Tag: george-20020124-risc-ra-interface
678    Description:
679    
680       There is a dramatic simplification in the interface to the
681       register allocator for RISC architectures as a result of making
682       parallel copy instructions explicit.
683    
684    ----------------------------------------------------------------------
685    Name: Matthias Blume
686    Date: 2002/01/22
687    Tag: blume-20020122-x86-ccalls
688    Description:
689    
690    Bug fix for c-calls on x86 (having to do with how char- and
691    short-arguments are being handled).
692    
693    ----------------------------------------------------------------------
694    Name: Matthias Blume
695    Date: 2002/01/21
696    Tag: blume-20020121-ff
697    Description:
698    
699    Another day of fiddling with the FFI...
700    
701    1. Bug fix/workaround:  CKIT does not complain about negative array
702       dimensions, so ml-nlffigen has to guard itself against this possibility.
703       (Otherwise a negative dimension would send it into an infinite loop.)
704    
705    2. Some of the abstract types (light objects, light pointers, most "base"
706       types) in structure C are now eqtypes.
707    
708    3. Added constructors and test functions for NULL function pointers.
709    
710    ----------------------------------------------------------------------
711    Name: Matthias Blume
712    Date: 2002/01/18
713    Tag: blume-20020118-ready-for-new-release
714    Description:
715    
716    Made config/srcarchiveurl point to a new place.  (Will provide boot
717    files shortly.)
718    
719    Maybe we christen this to be 110.38?
720    
721    ----------------------------------------------------------------------
722    Name: Matthias Blume
723    Date: 2002/01/18
724    Tag: blume-20020118-more-ffifiddle
725    Description:
726    
727    Today's FFI fiddling:
728    
729      - Provided a structure CGetSet with "convenient" versions of C.Get.* and
730        C.Set.* that use concrete (MLRep.*) arguments and results instead
731        of abstract ones.
732    
733      - Provided word-style bit operations etc. for "int" representation
734        types in MLRep.S<Foo>Bitops where <Foo> ranges over Char, Int, Short,
735        and Long.
736    
737    ----------------------------------------------------------------------
738    Name: Matthias Blume
739    Date: 2002/01/18
740    Tag: blume-20020118-use-x86-fp
741    Description:
742    
743    Now that x86-fast-fp seems to be working, I turned it back on again
744    by default.  (Seems to work fine now, even with the FFI.)
745    
746    Other than that, I added some documentation about the FFI to
747    src/ml-nlffigen/README and updated the FFI test examples in
748    src/ml-nlffi-lib/Tests/*.
749    
750    ----------------------------------------------------------------------
751    Name: Allen Leung
752    Date: 2002/01/17
753    Tag: leunga-20020117-x86-fast-fp-call
754    Description:
755    
756       1. Fixed a problem with handling return fp values when x86's fast fp
757          mode is turned on.
758    
759       2. Minor pretty printing fix for cellset.  Print %st(0) as %st(0) instead
760          of %f32.
761    
762       3. Added a constructor INT32lit to the ast of MLRISC tools.
763    
764    ----------------------------------------------------------------------
765    Name: Matthias Blume
766    Date: 2002/01/16
767    Tag: blume-20020116-ffifiddle
768    Description:
769    
770    More fiddling with the FFI interface:
771    
772     - Make constness 'c instead of rw wherever possible.  This eliminates
773       the need for certain explicit coercions.  (However, due to ML's
774       value polymorphism, there will still be many cases where explicit
775       coercions are necessary.  Phantom types are not the whole answer
776       to modeling a subtyping relationship in ML.)
777    
778     - ro/rw coersions for pointers added.  (Avoids the detour through */&.)
779    
780     - "printf" test example added to src/ml-nlffi-lib/Tests.  (Demonstrates
781       clumsy workaround for varargs problem.)
782    
783    ----------------------------------------------------------------------
784    Name: Lal George
785    Date: 2002/01/15
786    Tag: <none>
787    Description:
788    
789    1. Since COPY instructions are no longer native to the architecture,
790       a generic functor can be used to implement the expandCopies function.
791    
792    2. Allowed EXPORT and IMPORT pseudo-op declarations to appear inside a
793       TEXT segment.
794    
795    ----------------------------------------------------------------------
796    Name: Matthias Blume
797    Date: 2002/01/15
798    Tag: blume-20020115-ffiupdates
799    Description:
800    
801    1. Fix for bug resulting in single-precision float values being returned
802       incorrectly from FFI calls.
803    
804    2. Small modifications to C FFI API:
805    
806        - memory-allocation routines return straight objects (no options)
807          and raise an exception in out-of-memory situations
808        - unsafe extensions to cast between function pointers and pointers
809          from/to ints
810        - added structure C_Debug as an alternative to structure C where
811          pointer-dereferencing (|*| and |*!) always check for null-pointers
812        - added open_lib' to DynLinkage;  open_lib' works like open_lib
813          but also takes a (possibly empty) list of existing library handles
814          that the current library depends on
815    
816    ----------------------------------------------------------------------
817    Name: Matthias Blume
818    Date: 2002/01/10
819    Tag: blume-20020110-newffigen
820    Description:
821    
822    1. Updates to portable graph code.
823    
824    2. Major update to ml-nlffigen and ml-nlffi-lib.  Things are much
825       more scalable now so that even huge interfaces such as the one
826       for GTK compile in finite time and space. :-)
827       See src/ml-nlffigen/README for details on what's new.
828    
829    ----------------------------------------------------------------------
830    Name: Lal George
831    Date: 2001/01/09 14:31:35 EST 2002
832    Tag: george-20011206-rm-native-copy
833    Description:
834    
835            Removed the native COPY and FCOPY instructions
836            from all the architectures and replaced it with the
837            explicit COPY instruction from the previous commit.
838    
839            It is now possible to simplify many of the optimizations
840            modules that manipulate copies. This has not been
841            done in this change.
842    
843    ----------------------------------------------------------------------
844    Name: Lal George
845    Date: 2001/12/06 16:50:13 EST 2001
846    Tag: george-20011206-mlrisc-instruction
847    Description:
848    
849    Changed the representation of instructions from being fully abstract
850    to being partially concrete. That is to say:
851    
852      from
853            type instruction
854    
855      to
856            type instr                              (* machine instruction *)
857    
858            datatype instruction =
859                LIVE of {regs: C.cellset, spilled: C.cellset}
860              | KILL of {regs: C.cellset, spilled: C.cellset}
861              | COPYXXX of {k: CB.cellkind, dst: CB.cell list, src: CB.cell list}
862              | ANNOTATION of {i: instruction, a: Annotations.annotation}
863              | INSTR of instr
864    
865    This makes the handling of certain special instructions that appear on
866    all architectures easier and uniform.
867    
868    LIVE and KILL say that a list of registers are live or killed at the
869    program point where they appear. No spill code is generated when an
870    element of the 'regs' field is spilled, but the register is moved to
871    the 'spilled' (which is present, more for debugging than anything else).
872    
873    LIVE replaces the (now deprecated) DEFFREG instruction on the alpha.
874    We used to generate:
875    
876            DEFFREG f1
877            f1 := f2 + f3
878            trapb
879    
880    but now generate:
881    
882            f1 := f2 + f3
883            trapb
884            LIVE {regs=[f1,f2,f3], spilled=[]}
885    
886    Furthermore, the DEFFREG (hack) required that all floating point instruction
887    use all registers mentioned in the instruction. Therefore f1 := f2 + f3,
888    defines f1 and uses [f1,f2,f3]! This hack is no longer required resulting
889    in a cleaner alpha implementation. (Hopefully, intel will not get rid of
890    this architecture).
891    
892    COPYXXX is intended to replace the parallel COPY and FCOPY  available on
893    all the architectures. This will result in further simplification of the
894    register allocator that must be aware of them for coalescing purposes, and
895    will also simplify certain aspects of the machine description that provides
896    callbacks related to parallel copies.
897    
898    ANNOTATION should be obvious, and now INSTR represents the honest to God
899    machine instruction set!
900    
901    The <arch>/instructions/<arch>Instr.sml files define certain utility
902    functions for making porting easier -- essentially converting upper case
903    to lower case. All machine instructions (of type instr) are in upper case,
904    and the lower case form generates an MLRISC instruction. For example on
905    the alpha we have:
906    
907      datatype instr =
908         LDA of {r:cell, b:cell, d:operand}
909       | ...
910    
911      val lda : {r:cell, b:cell, d:operand} -> instruction
912        ...
913    
914    where lda is just (INSTR o LDA), etc.
915    
916    ----------------------------------------------------------------------
917    Name: Matthias Blume
918    Date: 2001/11/22 21:40:00 EST
919    Tag: Release_110_37
920    Description:
921    
922    Release 110.37.  This time for real.
923    
924    ----------------------------------------------------------------------
925    Name: Matthias Blume
926    Date: 2001/11/21 16:35:00 EST
927    Tag: blume-20011121-foot-in-mouth
928    Description:
929    
930    Removed the "Release_110_37" tag because of a serious bug.
931    This will be re-tagged once the bug is fixed.
932    
933    ----------------------------------------------------------------------
934    Name: Matthias Blume
935    Date: 2001/11/21 16:14:00 EST
936    Tag: blume-20011121-forgottenfile
937    Description:
938    
939    Forgot to add a file.  (Just a .tex-file -- part of
940    the CM manual source.)
941    
942    ----------------------------------------------------------------------
943    Name: Matthias Blume
944    Date: 2001/11/21 16:10:00 EST
945    Tag: blume-20011121-invalid_110_37
946    Description:
947    
948    Note: I removed the original tag "Release_110_37" from this commit
949          because we found a serious bug in all non-x86 backends.
950          - Matthias
951    
952    1. Modifications to the SML/NJ code generator and to the runtime system
953       so that code object name strings are directly inserted into code
954       objects at code generation time.  The only business the runtime system
955       has with this is now to read the name strings on occasions.
956       (The encoding of the name string has also changed somewhat.)
957    
958    2. CM now implements a simple "set calculus" for specifying export lists.
959       In particular, it is now possible to refer to the export lists of
960       other libraries/groups/sources and form unions as well as differences.
961       See the latest CM manual for details.
962    
963    3. An separate notion of "proxy" libraries has again be eliminated from
964       CM's model.  (Proxy libraries are now simply a special case of using
965       the export list calculus.)
966    
967    4. Some of the existing libraries now take advantage of the new set
968       calculus.
969       (Notice that not all libraries have been converted because some
970       of the existing .cm-files are supposed to be backward compatible
971       with 110.0.x.)
972    
973    5. Some cleanup in stand-alone programs.  (Don't use "exnMessage" -- use
974       "General.exnMessage"!  The former relies on a certain hook to be
975       initialized, and that often does not happen in the stand-alone case.)
976    
977    ----------------------------------------------------------------------
978    Name: Lal George
979    Date: 2001/11/21  13:56:18 EST
980    Tag: george-2001121-pseudo-ops
981    Description:
982    
983      Implemented a complete redesign of MLRISC pseudo-ops. Now there
984      ought to never be any question of incompatabilities with
985      pseudo-op syntax expected by host assemblers.
986    
987      For now, only modules supporting GAS syntax are implemented
988      but more should follow, such as MASM, and vendor assembler
989      syntax, e.g. IBM as, Sun as, etc.
990    
991    ----------------------------------------------------------------------
992    Name: Matthias Blume
993    Date: 2001/11/14 11:52:00 EST
994    Tag: blume-20011114-srcname
995    Description:
996    
997    1. Routed the name of the current source file to mlriscgen where it
998       should be directly emitted into the code object.  (This last part
999       is yet to be done.)
1000    
1001    2. Some cleanup of the pgraph code to make it match the proposal that
1002       I put out the other day.  (The proposal notwithstanding, things are
1003       still in flux here.)
1004    
1005    ----------------------------------------------------------------------
1006    Name: Lal George
1007    Date: 2001/11/14 09:44:04 EST
1008    Tag:
1009    Description:
1010    
1011      Fix for a backpatching bug reported by Allen.
1012    
1013      Because the boundary between short and long span-dependent
1014      instructions is +/- 128, there are an astounding number of
1015      span-dependent instructions whose size is over estimated.
1016    
1017      Allen came up with the idea of letting the size of span
1018      dependent instructions be non-monotonic, for a maxIter
1019      number of times, after which the size must be monotonically
1020      increasing.
1021    
1022      This table shows the number of span-dependent instructions
1023      whose size was over-estimated as a function of maxIter, for the
1024      file Parse/parse/ml.grm.sml:
1025    
1026         maxIter            # of instructions:
1027            10                      687
1028            20                      438
1029            30                      198
1030            40                        0
1031    
1032      In compiling the compiler, there is no significant difference in
1033      compilation speed between maxIter=10 and maxIter=40. Actually,
1034      my measurements showed that maxIter=40 was a tad faster than
1035      maxIter=10! Also 96% of the  files in the compiler reach a fix
1036      point within 13 iterations, so fixing maxIter at 40, while high,
1037      is okay.
1038    
1039    ----------------------------------------------------------------------
1040    Name: Matthias Blume
1041    Date: 2001/10/31 15:25:00 EST
1042    Tag: blume-20011031-pgraph
1043    Description:
1044    
1045    CKIT:
1046    * Changed the "Function" constructor of type Ast.ctype to carry optional
1047      argument identifiers.
1048    * Changed the return type of TypeUtil.getFunction accordingly.
1049    * Type equality ignores the argument names.
1050    * TypeUtil.composite tries to preserve argument names but gives up quickly
1051      if there is a mismatch.
1052    
1053    installation script:
1054    * attempts to use "curl" if available (unless "wget" is available as well)
1055    
1056    CM:
1057    * has an experimental implementation of "portable graphs" which I will
1058      soon propose as an implementation-independent library format
1059    * there are also new libraries $/pgraph.cm and $/pgraph-util.cm
1060    
1061    NLFFI-LIB:
1062    * some cleanup (all cosmetic)
1063    
1064    NLFFIGEN:
1065    * temporarily disabled the mechanism that suppresses ML output for
1066      C definitions whose identifiers start with an underscore character
1067    * generate val bindings for enum constants
1068    * user can request that only one style (light or heavy) is being used;
1069      default is to use both (command-line arguments: -heavy and -light)
1070    * fixed bug in handling of function types involving incomplete pointers
1071    * generate ML entry points that take record arguments (i.e., using
1072      named arguments) for C functions that have a prototype with named
1073      arguments
1074      (see changes to CKIT)
1075    
1076    ----------------------------------------------------------------------
1077    Name: Allen Leung
1078    Date: 2001/10/27 20:34:00 EDT
1079    Tag: leunga-20011027-x86-fast-fp-call
1080    Description:
1081    
1082       Fixed the bug described in blume-20010920-slowfp.
1083    
1084       The fix involves
1085          1. generating FCOPYs in FSTP in ia32-svid
1086          2. marking a CALL with the appropriate annotation
1087    
1088    ----------------------------------------------------------------------
1089    Name: Matthias Blume
1090    Date: 2001/10/16 11:32:00 EDT
1091    Tag: blume-20011016-netbsd
1092    Description:
1093    
1094    Underscore patch from Chris Richards (fixing problem with compiling
1095    runtime system under recent NetBSD).
1096    
1097    ----------------------------------------------------------------------
1098    Name: Allen Leung
1099    Date: 2001/10/12 17:18:32 EDT 2001
1100    Tag: leung-20011012-x86-printflowgraph
1101    Description:
1102    
1103    X86RA now uses a valid (instead of dummy) PrintFlowgraph module.
1104    
1105    ----------------------------------------------------------------------
1106    Name: Lal George
1107    Date: 2001/10/11 23:51:34 EDT
1108    Tag: george-20011011-too-many-instrs
1109    Description:
1110    
1111    The representation of a program point never expected to see more
1112    than 65536 instructions in a basic block!
1113    
1114    ----------------------------------------------------------------------
1115    Name: Lal George
1116    Date: 2001/10/09 09:41:37 EDT
1117    Tag: george-20011008-mlrisc-labels
1118    Description:
1119    
1120    Changed the machine description files to support printing of
1121    local and global labels in assembly code, based on host assembler
1122    conventions.
1123    
1124    ----------------------------------------------------------------------
1125    Name: Matthias Blume
1126    Date: 2001/09/25 15:25:00 EDT
1127    Tag: blume-20010925-exninfo
1128    Description:
1129    
1130    I provided a non-hook implementation of exnName (at the toplevel) and
1131    made the "dummy" implementation of exnMessage (at the toplevel) more
1132    useful: if nothing gets "hooked in", then at least you are going to
1133    see the exception name and a message indicating why you don't see more.
1134    
1135    [For the time being, programs that need exnMessage and want to use
1136    ml-build should either use General.exnMessage (strongly recommended) or
1137    refer to structure General at some other point so that CM sees a
1138    static dependency.]
1139    
1140    [Similar remarks go for "print" and "use":  If you want to use their
1141    functionality in stand-alone programs generated by ml-build, then use
1142    TextIO.output and Backend.Interact.useFile (from $smlnj/compiler.cm).]
1143    
1144    ----------------------------------------------------------------------
1145    Name: Matthias Blume
1146    Date: 2001/09/20 17:28:00 EDT
1147    Tag: blume-20010920-slowfp
1148    Description:
1149    
1150    Allen says that x86-fast-fp is not safe yet, so I turned it off again...
1151    
1152    ----------------------------------------------------------------------
1153    Name: Matthias Blume
1154    Date: 2001/09/20 17:20:00 EDT
1155    Tag: blume-20010920-canonicalpaths
1156    Description:
1157    
1158    0. Updated the BOOT file (something that I forgot to do earlier).
1159    
1160    1. Small internal change to CM so that it avoids "/../" in filenames
1161       as much as possible (but only where it is safe).
1162    
1163    2. Changed config/_run-sml (resulting in a changed bin/.run-sml) so
1164       that arguments that contain delimiters are passed through correctly.
1165       This change also means that all "special" arguments of the form
1166       @SMLxxx... must come first.
1167    
1168    3. Changed install script to put relative anchor names for tool commands
1169       into pathconfig.
1170    
1171    ----------------------------------------------------------------------
1172    Name: Matthias Blume
1173    Date: 2001/09/18 15:35:00 EDT
1174    Tag: blume-20010918-readme11036
1175    Description:
1176    
1177    Added README files.
1178    
1179    ----------------------------------------------------------------------
1180    Name: Matthias Blume
1181    Date: 2001/09/18 11:45:00 EDT
1182    Tag: Release_110_36 (retag)
1183    Description:
1184    
1185    Fixed mistake in config/preloads. Retagged as 110.36.
1186    
1187    ----------------------------------------------------------------------
1188    Name: Matthias Blume
1189    Date: 2001/09/18 09:40:00 EDT
1190    Tag: Release_110_36_orig (tag changed)
1191    Description:
1192    
1193    New version (110.36).  New bootfiles.
1194    
1195    ----------------------------------------------------------------------
1196    Name: Matthias Blume
1197    Date: 2001/09/14 16:15:00 EDT
1198    Tag: blume-20010914-x86fastfp
1199    Description:
1200    
1201    John committed some changes that Allen made, in particular a (hopefully)
1202    correctly working version of the x86-fp module.
1203    
1204    I changed the default setting of the Control.MLRISC.getFlag "x86-fast-fp"
1205    flag to "true".  Everything seems to compile to a fixpoint ok, and
1206    "mandelbrot" speeds up by about 15%.
1207    
1208    ----------------------------------------------------------------------
1209    Name: Matthias Blume
1210    Date: 2001/09/13 11:20:00 EDT
1211    Tag: blume-20010913-minimal
1212    Description:
1213    
1214    1. Stefan Monnier's patch to fix a miscompilation problem that
1215       was brought to light by John Reppy's work on Moby.
1216    
1217    2. Implemented a minimal "structure Compiler" that contains just
1218       "version" and "architecture".  The minimal version will be
1219       available when the full version is not.  This is for backward-
1220       compatibility with code that wants to test Compiler.version.
1221    
1222    ----------------------------------------------------------------------
1223    Name: Matthias Blume
1224    Date: 2001/08/28 14:03:00 EDT
1225    Tag: blume-20010828-ml-lex
1226    Description:
1227    
1228    Fix for bug 1581, received from Neophytos Michael.
1229    
1230    ----------------------------------------------------------------------
1231    Name: Matthias Blume
1232    Date: 2001/08/27 11:20:00 EDT
1233    Tag: blume-20010827-readme11035
1234    Description:
1235    
1236    Fleshed out the README file for 110.35.
1237    
1238    ----------------------------------------------------------------------
1239    Name: Matthias Blume
1240    Date: 2001/08/24 17:10:00 EDT
1241    Tag: Release_110_35
1242    Description:
1243    
1244    New version number (110.35).  New bootfiles.
1245    
1246    ----------------------------------------------------------------------
1247    Name: Lal George
1248    Date: 2001/08/24 13:47:18 EDT 2001
1249    Tag: george-20010824-MLRISC-graphs
1250    Description:
1251    
1252     removed clusters from MLRISC completely and replaced with graphs.
1253    
1254    ----------------------------------------------------------------------
1255    Name: Matthias Blume
1256    Date: 2001/08/23 17:50:00 EDT
1257    Tag: blume-20010823-toplevel
1258    Description:
1259    
1260    - some reorganization of the code that implements various kinds of
1261      environments in the compiler (static, dynamic, symbolic, combined)
1262    - re-implemented the EnvRef module so that evalStream works properly
1263      (if the stream contains references to "use", "CM.make", etc.)
1264    - cleaned up evalloop.sml and interact.sml (but they need more cleaning)
1265    
1266    ----------------------------------------------------------------------
1267    Name: Matthias Blume
1268    Date: 2001/08/20 15:50 EDT
1269    Tag: blume20010820-slipup
1270    Description:
1271    
1272    I forgot to commit a few files.  Here they are...
1273    
1274    ----------------------------------------------------------------------
1275    Name: Matthias Blume
1276    Date: 2001/08/20 15:35:00 EDT
1277    Tag: blume-20010820-debugprof
1278    Description:
1279    
1280    !!!! NEW BOOTFILES !!!!
1281    
1282    This is another round of reorganizing the compiler sources.  This
1283    time the main goal was to factor out all the "instrumentation"
1284    passes (for profiling and backtracing) into their own library.
1285    The difficulty was to do it in such a way that it does not depend
1286    on elaborate.cm but only on elabdata.cm.
1287    
1288    Therefore there have been further changes to both elaborate.cm and
1289    elabdata.cm -- more "generic" things have been moved from the former
1290    to the latter.  As a result, I was forced to split the assignment
1291    of numbers indicating "primtyc"s into two portions: SML-generic and
1292    SML/NJ-specific.  Since it would have been awkward to maintain,
1293    I bit the bullet and actually _changed_ the mapping between these
1294    numbers and primtycs.  The bottom line of this is that you need
1295    a new set of bin- and bootfiles.
1296    
1297    I have built new bootfiles for all architectures, so doing a fresh
1298    checkout and config/install.sh should be all you need.
1299    
1300    The newly created library's name is
1301    
1302        $smlnj/viscomp/debugprof.cm
1303    
1304    and its sources live under
1305    
1306        src/compiler/DebugProf
1307    
1308    ----------------------------------------------------------------------
1309    Name: Matthias Blume
1310    Date: 2001/08/15 17:15:00 EDT
1311    Tag: blume-20010815-compreorg
1312    Description:
1313    
1314    This is a first cut at reorganizing the CM libraries that make up the
1315    core of the compiler.  The idea is to separate out pieces that could
1316    be used independently by tools, e.g., the parser, the typechecker, etc.
1317    
1318    The current status is a step in this direction, but it is not quite
1319    satisfactory yet.  Expect more changes in the future.
1320    
1321    Here is the current (new) organization...
1322    
1323        What used to be $smlnj/viscomp/core.cm is now divided into
1324        six CM libraries:
1325    
1326             $smlnj/viscomp/basics.cm
1327                           /parser.cm
1328                           /elabdata.cm
1329                           /elaborate.cm
1330                           /execute.cm
1331                           /core.cm
1332    
1333        The CM files for these libraries live under src/system/smlnj/viscomp.
1334        All these libraries are proxy libraries that contain precisely
1335        one CM library component.  Here are the locations of the components
1336        (all within the src/compiler tree):
1337    
1338             Basics/basics.cm
1339             Parse/parser.cm
1340             ElabData/elabdata.cm
1341             Elaborator/elaborate.cm
1342             Execution/execute.cm
1343             core.cm
1344    
1345         [This organization is the same that has been used already
1346         for a while for the architecture-specific parts of the visible
1347         compiler and for the old version of core.cm.]
1348    
1349         As you will notice, many source files have been moved from their
1350         respective original locations to a new home in one of the above
1351         subtrees.
1352    
1353         The division of labor between the new libraries is the following:
1354    
1355             basics.cm:
1356                - Simple, basic definitions that pertain to many (or all) of
1357                  the other libraries.
1358             parser.cm:
1359                - The SML parser, producing output of type Ast.dec.
1360                - The type family for Ast is also defined and exported here.
1361             elabdata.cm:
1362                - The datatypes that describe input and output of the elaborator.
1363                  This includes types, absyn, and static environments.
1364             elaborator.cm:
1365                - The SML/NJ type checker and elaborator.
1366                  This maps an Ast.dec (with a given static environment) to
1367                  an Absyn.dec (with a new static environment).
1368                - This libraries implements certain modules that used to be
1369                  structures as functors (to remove dependencies on FLINT).
1370             execute.cm:
1371                - Everything having to do with executing binary code objects.
1372                - Dynamic environments.
1373             core.cm:
1374                - SML/NJ-specific instantiations of the elaborator and MLRISC.
1375                - Top-level modules.
1376                - FLINT (this should eventually become its own library)
1377    
1378    Notes:
1379    
1380    I am not 100% happy with the way I separated the elaborator (and its
1381    data structures) from FLINT.  Two instances of the same problem:
1382    
1383        1. Data structures contain certain fields that carry FLINT-specific
1384           information.  I hacked around this using exn and the property list
1385           module from smlnj-lib.  But the fact that there are middle-end
1386           specific fields around at all is a bit annoying.
1387    
1388        2. The elaborator calculates certain FLINT-related information.  I tried
1389           to make this as abstract as I could using functorization, but, again,
1390           the fact that the elaborator has to perform calculations on behalf
1391           of the middle-end at all is not nice.
1392    
1393        3. Having to used exn and property lists is unfortunate because it
1394           weakens type checking.  The other alternative (parameterizing
1395           nearly *everything*) is not appealing, though.
1396    
1397    I removed the "rebinding =" warning hack because due to the new organization
1398    it was awkward to maintain it.  As a result, the compiler now issues some of
1399    these warnings when compiling init.cmi during bootstrap compilation. On
1400    the plus side, you also get a warning when you do, for example:
1401       val op = = Int32.+
1402    which was not the case up to now.
1403    
1404    I placed "assign" and "deref" into the _Core structure so that the
1405    code that deals with the "lazy" keyword can find them there.  This
1406    removes the need for having access to the primitive environment
1407    during elaboration.
1408    
1409    ----------------------------------------------------------------------
1410    Name: Matthias Blume
1411    Date: 2001/08/13
1412    Tag: blume-20010813-closures
1413    Description:
1414    
1415    This fix was sent to us by Zhong Shao.  It is supposed to improve the
1416    performance of certain loops by avoiding needless closure allocation.
1417    
1418    ----------------------------------------------------------------------
1419    Name: Lal George
1420    Date: 2001/07/31 10:03:23 EDT 2001
1421    Tag: george-20010731-x86-fmalloc
1422    Description: Fixed bug in x86 calls
1423    
1424        There was a bug where call instructions would mysteriously
1425        vanish. The call instruction had to be one that returned
1426        a floating point value.
1427    
1428    ----------------------------------------------------------------------
1429    Name: Lal George
1430    Date: 2001/07/19 16:36:29 EDT 2001
1431    Tag: george-20010719-simple-cells
1432    Description:
1433    
1434    I have dramatically simplified the interface for CELLS in MLRISC.
1435    
1436    In summary, the cells interface is broken up into three parts:
1437    
1438      1. CellsBasis : CELLS_BASIS
1439    
1440            CellsBasis is a top level structure and common for all
1441            architectures.  it contains the definitions of basic datatypes
1442            and utility  functions over these types.
1443    
1444      2. functor Cells() : CELLS
1445    
1446            Cells generates an interface for CELLS that incorporates the
1447            specific resources on the target architecture, such as the
1448            presence of special register classes, their number and size,
1449            and various useful substructures.
1450    
1451      3. <ARCH>CELLS
1452    
1453            e.g. SparcCells: SPARCCELLS
1454    
1455            <ARCH>CELLS usually contains additional bindings for special
1456            registers  on the architecture, such as:
1457    
1458                    val r0 : cell           (* register zero *)
1459                    val y : cell            (* Y register *)
1460                    val psr : cell          (* processor status register *)
1461                    ...
1462    
1463            The structure returned by applying the Cells functor is opened
1464            in this interface.
1465    
1466    The main implication of all this is that the datatypes for cells is
1467    split between CellsBasis and CELLS -- a fairly simple change for user
1468    code.
1469    
1470    In the old scheme the CELLS interface had a definitional binding of
1471    the form:
1472    
1473            signature CELLS = sig
1474    
1475               structure CellsBasis = CellsBasis
1476    
1477               ...
1478    
1479            end
1480    
1481    With all the sharing constraints that goes on in MLRISC, this old
1482    design  quickly leads to errors such as:
1483    
1484            "structure definition spec inside of sharing ... "
1485    
1486    
1487    and appears to require an unacceptable amount of sharing and where
1488    constraint hackery.
1489    
1490    I think this error message (the interaction of definitional specs and
1491    sharing) requires more explanation on our web page.
1492    
1493    ----------------------------------------------------------------------
1494    Name: Matthias Blume
1495    Date: 2001/07/19 15:00:00 EDT
1496    Tag: blume-20010719-libreorg
1497    Description:
1498    
1499    This update puts together a fairly extensive but straightforward change
1500    to the way the libraries that implement the interactive system are
1501    organized:
1502    
1503       The biggest change is the elimination of structure Compiler.  As a
1504       replacement for this structure, there is now a CM library
1505       (known as $smlnj/compiler.cm or $smlnj/compiler/current.cm)
1506       that exports all the substructures of the original structure Compiler
1507       directly.  So instead of saying Compiler.Foo.bar one now simply
1508       says Foo.bar.  (The CM libraries actually export a collection of
1509       structures that is richer than the collection of substructures of
1510       structure Compiler.)
1511    
1512       To make the transition smooth, there is a separate library called
1513       $smlnj/compiler/compiler.cm which puts together and exports the
1514       original structure Compiler (or at least something very close to it).
1515    
1516       There are five members of the original structure Compiler
1517       that are not exported directly but which instead became members
1518       of a new structure Backend (described by signature BACKEND).  These are:
1519       structure Profile (: PROFILE), structure Compile (: COMPILE), structure
1520       Interact (: INTERACT), structure Machine (: MACHINE), and val
1521       architecture (: string).
1522    
1523       Structure Compiler.Version has become structure CompilerVersion.
1524    
1525       Cross-compilers for alpha32, hppa, ppc, sparc, and x86 are provided
1526       by $smlnj/compiler/<arch>.cm where <arch> is alpha32, hppa, ppc, sparc,
1527       or x86, respectively.
1528       Each of these exports the same frontend structures that
1529       $smlnj/compiler.cm exports.  But they do not have a structure Backend
1530       and instead export some structure <Arch>Backend where <Arch> is Alpha32,
1531       Hppa, PPC, Sparc, or X86, respectively.
1532    
1533       Library $smlnj/compiler/all.cm exports the union of the exports of
1534       $smlnj/compiler/<arch>.cm
1535    
1536       There are no structures <Arch>Compiler anymore, use
1537       $smlnj/compiler/<arch>.cm instead.
1538    
1539       Library host-compiler-0.cm is gone.  Instead, the internal library
1540       that instantiates CM is now called cm0.cm.  Selection of the host
1541       compiler (backend) is no longer done here but. (Responsibility for it
1542       now lies with $smlnj/compiler/current.cm.  This seems to be more
1543       logical.)
1544    
1545       Many individual files have been moved or renamed.  Some files have
1546       been split into multiple files, and some "dead" files have been deleted.
1547    
1548    Aside from these changes to library organization, there are also changes
1549    to the way the code itself is organized:
1550    
1551       Structure Binfile has been re-implemented in such a way that it no
1552       longer needs any knowledge of the compiler.  It exclusively deals
1553       with the details of binfile layout.  It no longer invokes the
1554       compiler (for the purpose of creating new prospective binfile
1555       content), and it no longer has any knowledge of how to interpret
1556       pickles.
1557    
1558       Structure Compile (: COMPILE) has been stripped down to the bare
1559       essentials of compilation.  It no longer deals with linking/execution.
1560       The interface has been cleaned up considerably.
1561    
1562       Utility routines for dealing with linking and execution have been
1563       moved into their own substructures.
1564    
1565       (The ultimate goal of these changes is to provide a light-weight
1566       binfile loader/linker (at least for, e.g., stable libraries) that
1567       does not require CM or the compiler to be present.)
1568    
1569    CM documentation has been updated to reflect the changes to library
1570    organization.
1571    
1572    ----------------------------------------------------------------------
1573    Name: Matthias Blume
1574    Date: 2001/07/10 17:30:00 EDT
1575    Tag: Release_110_34
1576    Description:
1577    
1578    Minor tweak to 110.34 (re-tagged):
1579    
1580      - README.html file added to CVS repository
1581      - runtime compiles properly under FreeBSD 3.X and 4.X
1582    
1583    ----------------------------------------------------------------------
1584    Name: Matthias Blume
1585    Date: 2001/07/10 17:30:00 EDT
1586    Tag: Release_110_34
1587    Description:
1588    
1589    New version number (110.34). New bootfiles.
1590    
1591    ----------------------------------------------------------------------
1592    Name: Matthias Blume
1593    Date: 2001/07/09 16:00:00 EDT
1594    Tag: blume-20010709-more-varargs
1595    Description:
1596    
1597    I changed the handling of varargs in ml-nlffigen again:
1598    The ellipsis ... will now simply be ignored (with an accompanying warning).
1599    
1600    The immediate effect is that you can actually call a varargs function
1601    from ML -- but you can't actually supply any arguments beyond the ones
1602    specified explicitly.  (For example, you can call printf with its format
1603    string, but you cannot pass additional arguments.)
1604    
1605    This behavior is only marginally more useful than the one before, but
1606    it has the advantage that a function or, more importantly, a function
1607    type never gets dropped on the floor, thus avoiding follow-up problems with
1608    other types that refer to the offending one.
1609    
1610    ----------------------------------------------------------------------
1611    Name: Matthias Blume
1612    Date: 2001/07/09 11:25:00 EDT
1613    Tag: blume-20010709-varargs
1614    Description:
1615    
1616    1. ckit-lib.cm now exports structure Error
1617    2. ml-nlffigen reports occurences of "..." (i.e., varargs function types)
1618       with a warning accompanied by a source location.  Moreover, it
1619       merely skips the offending function or type and proceeds with the
1620       rest of its work.u  As a result, one can safely feed C code containing
1621       "..." to ml-nlffigen.
1622    3. There are some internal improvements to CM, providing slightly
1623       more general string substitutions in the tools subsystem.
1624    
1625    ----------------------------------------------------------------------
1626    Name: Matthias Blume
1627    Date: 2001/06/27 15:10:00 EDT
1628    Tag: blume-20010627-concur
1629    Description:
1630    
1631    Fixed a small bug in CM's handling of parallel compilation.
1632    (You could observe the bug by Control-C-interrupting an ordinary
1633    CMB.make or CM.stabilize and then attaching some compile servers.
1634    The result was that all of a sudden the previously interrupted
1635    compilation would continue on its own.  This was because of
1636    an over-optimization: CM did not bother to clean out certain queues
1637    when no servers were attached "anyway", resulting in the contents
1638    of these queues to grab control when new servers did get attached.)
1639    
1640    There is also another minor update to the CM manual.
1641    
1642    ----------------------------------------------------------------------
1643    Name: Matthias Blume
1644    Date: 2001/06/26 16:15:00 EDT
1645    Tag: blume-20010626-cmdoc
1646    Description:
1647    
1648    Minor typo fixed in CM manual (syntax diagram for libraries).
1649    
1650    ----------------------------------------------------------------------
1651    Name: Matthias Blume
1652    Date: 2001/06/25 22:55:00 EDT
1653    Tag: blume-20010625-x86pc
1654    Description:
1655    
1656    Fixed a nasty bug in the X86 assembly code that caused signal
1657    handlers to fail (crash) randomly.
1658    
1659    ----------------------------------------------------------------------
1660    Name: Matthias Blume
1661    Date: 2001/06/25 12:05:00 EDT
1662    Tag: blume-20010625-nlffigen
1663    Description:
1664    
1665    This update fixes a number of minor bugs in ml-nlffigen as reported by
1666    Nick Carter <nbc@andrew.cmu.edu>.
1667    
1668      1. Silly but ok typedefs of the form "typedef void myvoid;" are now accepted.
1669      2. Default names for generated files are now derived from the name of
1670         the C file *without its directory*.  In particular, this causes generated
1671         files to be placed locally even if the C file is in some system directory.
1672      3. Default names for generated signatures and structures are also derived
1673         from the C file name without its directory.  This avoids silly things
1674         like "structure GL/GL".
1675         (Other silly names are still possible because ml-nlffigen does not do
1676          a thorough check of whether generated names are legal ML identifiers.
1677          When in doubt, use command line arguments to force particular names.)
1678    
1679    ----------------------------------------------------------------------
1680    Name: Matthias Blume
1681    Date: 2001/06/21 12:25:00 EDT
1682    Tag: blume-20010621-eXene
1683    Description:
1684    
1685    eXene now compiles and (sort of) works again.
1686    
1687    The library name (for version > 110.33) is $/eXene.cm.
1688    
1689    I also added an new example in src/eXene/examples/nbody.  See the
1690    README file there for details.
1691    
1692    ----------------------------------------------------------------------
1693    Name: Matthias Blume
1694    Date: 2001/06/20 16:40:00 EDT
1695    Tag: blume-20010620-cml
1696    Description:
1697    
1698    CML now compiles and works again.
1699    
1700    Libraries (for version > 110.33):
1701    
1702      $cml/cml.cm            Main CML library.
1703      $cml/basis.cm          CML's version of $/basis.cm.
1704      $cml/cml-internal.cm   Internal helper library.
1705      $cml/core-cml.cm       Internal helper library.
1706      $cml-lib/trace-cml.cm  Tracing facility.
1707      $cml-lib/smlnj-lib.cm  CML's version of $/smlnj-lib.cm
1708    
1709    The installer (config/install.sh) has been taught how to properly
1710    install this stuff.
1711    
1712    ----------------------------------------------------------------------
1713    Name: Matthias Blume
1714    Date: 2001/06/19 17:55:00 EDT
1715    Tag: blume-20010619-instantiate
1716    Description:
1717    
1718    This un-breaks the fix for bug 1432.
1719    (The bug was originally fixed in 110.9 but I broke it again some
1720    time after that.)
1721    
1722    ----------------------------------------------------------------------
1723    Name: Matthias Blume
1724    Date: 2001/06/19 17:25:00 EDT
1725    Tag: blume-20010619-signals
1726    Description:
1727    
1728    This should (hopefully) fix the long-standing signal handling bug.
1729    (The runtime system was constructing a continuation record with an
1730    incorrect descriptor which would cause the GC to drop data on the floor...)
1731    
1732    ----------------------------------------------------------------------
1733    Name: Matthias Blume
1734    Date: 2001/06/15 15:05:00 EDT
1735    Tag: blume-20010615-moresparc
1736    Description:
1737    
1738    Here is a short late-hour update related to Sparc c-calls:
1739    
1740     -- made handling of double-word arguments a bit smarter
1741    
1742     -- instruction selection phase tries to collapse certain clumsily
1743        constructed ML-Trees; typical example:
1744    
1745            ADD(ty,ADD(_,e,LI d1),LI d2)  ->  ADD(ty,e,LI(d1+d2))
1746    
1747        This currently has no further impact on SML/NJ since mlriscGen does
1748        not seem to generate such patterns in the first place, and c-calls
1749        (which did generate them in the beginning) has meanwhile been fixed
1750        so as to avoid them as well.
1751    
1752    ----------------------------------------------------------------------
1753    Name: Matthias Blume
1754    Date: 2001/06/15 15:05:00 EDT
1755    Tag: blume-20010615-sparc
1756    Description:
1757    
1758    The purpose of this update is to provide an implementation of NLFFI
1759    on Sparc machines.
1760    
1761    Here are the changes in detail:
1762    
1763       * src/MLRISC/sparc/c-calls/sparc-c-calls.sml is a new file containing
1764       the Sparc implementation of the c-calls API.
1765       * The Sparc backend of SML/NJ has been modified to uniformely use %fp
1766       for accessing the ML frame.  Thus, we have a real frame pointer and
1767       can freely modify %sp without need for an omit-frame-ptr phase.
1768       The vfp logic in src/compiler/CodeGen/* has been changed to accomodate
1769       this case.
1770       * ml-nlffigen has been taught to produce code for different architectures
1771       and calling conventions.
1772       * In a way similar to what was done in the x86 case, the Sparc
1773       backend uses its own specific extension to mltree.  (For example,
1774       it needs to be able to generate UNIMP instructions which are part
1775       of the calling convention.)
1776       * ml-nlffi-lib was reorganized to make it more modular (in particular,
1777       to make it easier to plug in new machine- and os-dependent parts).
1778    
1779    There are some other fairly unrelated bug fixes and cleanups as well:
1780    
1781       * I further hacked the .cm files for MLRISC tools (like MDLGen) so
1782       that they properly share their libraries with existing SML/NJ libraries.
1783       * I fixed a minor cosmetic bug in CM, supressing certain spurious
1784       follow-up error messages.
1785       * Updates to CM/CMB documentation.
1786    
1787    TODO items:
1788    
1789       * MLRISC should use a different register as its asmTemp on the Sparc.
1790         (The current %o2 is a really bad choice because it is part of the
1791         calling conventions, so things might interfere in unexpected ways.)
1792    
1793    ----------------------------------------------------------------------
1794    Name: Matthias Blume
1795    Date: 2001/06/07
1796    Tag: blume-20010607-calls
1797    Description:
1798    
1799    A number of internal changes related to C calls and calling conventions:
1800    
1801    1. ML-Tree CALL statements now carry a "pops" field.  It indicates the
1802       number of bytes popped implicitly (by the callee).  In most cases
1803       this field is 0 but on x86/win32 it is some non-zero value.  This
1804       is information provided for the benefit of the "omit-frameptr" pass.
1805    2. The CALL instruction on the x86 carries a similar "pops" field.
1806       The instruction selection phase copies its value from the ML-Tree
1807       CALL statement.
1808    3. On all other architectures, the instruction selection phase checks
1809       whether "pops=0" and complains if not.
1810    4. The c-calls implementation for x86 now accepts two calling conventions:
1811       "ccall" and "stdcall".  When "ccall" is selected, the caller cleans
1812       up after the call and pops is set to 0.  For "stdcall", the caller
1813       does nothing, leaving the cleanup to the callee; pops is set to
1814       the number of bytes that were pushed onto the stack.
1815    5. The cproto decoder (compiler/Semant/types/cproto.sml) now can
1816       distinguish between "ccall" and "stdcall".
1817    6. The UNIMP instruction has been added to the supported Sparc instruction
1818       set. (This is needed for implementing the official C calling convention
1819       on this architecture.)
1820    7. I fixed some of the .cm files under src/MLRISC/Tools to make them
1821       work with the latest CM.
1822    
1823    ----------------------------------------------------------------------
1824    Name: Matthias Blume
1825    Date: 2001/06/05 15:10:00 EDT
1826    Tag: blume-20010605-cm-index
1827    Description:
1828    
1829    0. The "lambdasplit" parameter for class "sml" in CM has been documented.
1830    
1831    1. CM can now generate "index files".  These are human-readable files
1832       that list on a per-.cm-file basis each toplevel symbol defined or
1833       imported.  The location of the index file for
1834       <p>/<d>.cm is <p>/CM/INDEX/<d>.cm.
1835       To enable index-file generation, set CM.Control.generate_index to true
1836       or export an environment-symbol: export CM_GENERATE_INDEX=true.
1837    
1838       The CM manual has been updated accordingly.
1839    
1840    2. I made some slight modifications to the c-calls API in MLRISC.
1841    
1842         a) There is now a callback to support saving/restoring of
1843            dedicated but caller-save registers around the actual call
1844            instruction.
1845         b) One can optionally specify a comment-annotation for the
1846            call instruction.
1847    
1848    3. SML/NJ (mlriscGen.sml) uses this new API for the rawccall primop.
1849       (For example, the comment annotation shows the C prototype of
1850        the function being called.)
1851    
1852    ----------------------------------------------------------------------
1853    Name: Matthias Blume
1854    Date: 2001/06/01 13:30:00 EDT
1855    Tag: blume-20010601-nlffi-cleanup
1856    Description:
1857    
1858    This is mostly a cleanup of MLFFI stuff:
1859    
1860       - some signature files have been put into a more exposed place
1861       - the ugly 'f type parameter is gone (simplifies types tremendously!)
1862       - ml-nlffigen changed accordingly
1863       - tutorial updated
1864    
1865    Other changes:
1866    
1867       - author's affiliation in CM manual(s) updated
1868       - some more recognized keywords added to Allen's sml.sty
1869    
1870    ----------------------------------------------------------------------
1871    Name: Matthias Blume
1872    Date: 2001/05/25 15:30:00 EDT
1873    Tag: blume-20010525-iptr
1874    Description:
1875    
1876      - put the official 110.33-README (as it appears on the ftp server) under
1877        CVS
1878      - fixed a small bug related to incomplete pointer types in
1879        ml-nlffigen
1880      - small cosmetic change to the ml-nlffi-lib's "arr" type constructor
1881        (it does not need the 'f type parameter)
1882    
1883    ----------------------------------------------------------------------
1884    Name: Matthias Blume
1885    Date: 2001/05/23 14:30:00 EDT
1886    Tag: Release_110_33
1887    Description:
1888    
1889    New version number (110.33).  New bootfiles.
1890    
1891    ----------------------------------------------------------------------
1892    Name: Matthias Blume
1893    Date: 2001/05/22 18:06:00 EDT
1894    Tag: blume-20010522-targets
1895    Description:
1896    
1897    Made install.sh use file config/targets.customized if it exists, falling
1898    back to config/targets if it doesn't.  This way one can have a customized
1899    version of the targets file without touching the "real thing", thus
1900    eliminating the constant fear of accidentally checking something bogus
1901    back into the CVS repository...  (File config/targets.customized must
1902    not be added to the repository!)
1903    
1904    ----------------------------------------------------------------------
1905    Name: Matthias Blume
1906    Date: 2001/05/22 16:30:00 EDT
1907    Tag: blume-20010522-minitut
1908    Description:
1909    
1910    1. Bug fix in ml-nlffigen; now (hopefully) correctly handling
1911       struct returns.
1912    2. Added src/ml-nlffi-lib/Doc/mini-tutorial.txt.  This is some very
1913       incomplete, preliminary documentation for NLFFI.
1914    
1915    ----------------------------------------------------------------------
1916    Name: Matthias Blume
1917    Date: 2001/05/14 11:30:00 EDT
1918    Tag: blume-20010514-script
1919    Description:
1920    
1921    Some bugs in install script fixed.
1922    
1923    In addition to that I also made a slight change to the NLFFI API:
1924    Functors generated by ml-nlffigen now take the dynamic library as a
1925    straight functor argument, not as a suspended one.  (The original
1926    functor code used to force the suspension right away anyway, so there
1927    was nothing gained by this complication of the interface.)
1928    
1929    ----------------------------------------------------------------------
1930    Name: Matthias Blume
1931    Date: 2001/05/11 14:35:00 EDT
1932    Tag: blume-20010511-ml-nlffi
1933    Description:
1934    
1935    I finally took the plunge and added my new FFI code to the main
1936    repository.  For x86-linux it is now ready for prime-time.
1937    
1938    There are two new subdirectories of "src":
1939    
1940      - ml-nlffi-lib:
1941           The utility library for programs using the FFI interface.
1942           Here is the implementation of $/c.cm and its associated low-level
1943           partners $/c-int.cm and $/memory.cm.
1944      - ml-nlffigen:
1945           A stand-alone program for generating ML glue code from C source
1946           code.
1947    
1948    Building ml-nlffigen requires $/ckit-lib.cm.
1949    
1950    The config/install.sh script has been updates to do the Right Thing
1951    (hopefully).
1952    
1953    Notice that the source tree for the C-Kit will not be put under "src"
1954    but directly under the installation root directory.  (This is the
1955    structure that currently exists on the CVS server when you check out
1956    module "sml".)  Fortunately, config/install.sh knows about this oddity.
1957    
1958    Bugs: No documentation yet.
1959    
1960    ----------------------------------------------------------------------
1961    Name: Matthias Blume
1962    Date: 2001/05/09 16:35:00 EDT
1963    Tag: blume-20010509-cpscontract
1964    Description:
1965    
1966    Fixed a bug in the accounting code in cpsopt/contract.sml.  (The
1967    wrapper/unwrapper elimination did not decrement usage counts and some
1968    dead variables got overlooked by the dead-up logic.)
1969    
1970    ----------------------------------------------------------------------
1971    Name: Lal George
1972    Date: 2001/05/08  17:26:09 EDT
1973    Tag: george-20010508-omit-frameptr
1974    Description:
1975    
1976    Changes to implement the omit-frame-pointer optimization to support
1977    raw C calls. For now, there is only support on the Intel x86, but
1978    other architectures will follow as more experience is gained with this.
1979    
1980    
1981    ----------------------------------------------------------------------
1982    Name: Matthias Blume
1983    Date: 2001/05/07 14:40:00 EDT
1984    Tag: blume-20010507-proxies
1985    Description:
1986    
1987    I made into "proxy libraries" all libraries that qualify for such a
1988    change.  (A qualifying library is a library that has another library or
1989    groups as its sole member and repeats that member's export list
1990    verbatim.  A proxy library avoids this repetition by omitting its export
1991    list, effectively inheriting the list that its (only) member exports.
1992    See the CM manual for more explanation.)
1993    The main effect is that explicit export lists for these libraries
1994    do not have to be kepts in sync, making maintenance a bit easier.
1995    
1996    I also added copyright notices to many .cm-files.
1997    
1998    Last but not least, I made a new set of bootfiles.
1999    
2000    ----------------------------------------------------------------------
2001    Name: Matthias Blume
2002    Date: 2001/05/04 17:00:00 EDT
2003    Tag: blume-20010504-cm-lsplit
2004    Description:
2005    
2006    0. John merged pending changes to $/smlnj-lib.cm
2007    
2008    1. Allen's previous change accidentally backed out of one of Lal's
2009       earlier changes.  I undid this mistake (re-introducing Lal's change).
2010    
2011    2. I used the new topOrder' function from graph-scc.sml (from $/smlnj-lib.cm)
2012       within the compiler where applicable.  There is some code simplification
2013       because of that.
2014    
2015    3. The "split" phase (in FLINT) is now part of the default list of phases.
2016       Compiler.Control.LambdaSplitting.* can be used to globally control the
2017       lambda-splitting (cross-module-inlining) engine.  In addition to that,
2018       it can now also be controlled on a per-source basis: CM has been taught
2019       a new tool parameter applicable to ML source files.
2020    
2021       - To turn lambda-splitting off completely:
2022            local open Compiler.Control.LambdaSplitting in
2023                val _ = set Off
2024            end
2025       - To make "no lambda-splitting" the global default (but allow per-source
2026         overriding); this is the initial setting:
2027            local open Compiler.Control.LambdaSplitting in
2028                val _ = set (Default NONE)
2029            end
2030       - To make "lambda-splitting with aggressiveness a" the global default
2031         (and allow per-source overriding):
2032            local open Compiler.Control.LambdaSplitting in
2033                val _ = set (Default (SOME a))
2034            end
2035    
2036       - To turn lambda-splitting off for a given ML souce file (say: a.sml)
2037         write (in the respective .cm-file):
2038            a.sml (lambdasplitting:off)
2039       - To turn lambda-splitting for a.sml on with minimal aggressiveness:
2040            a.sml (lambdasplitting:on)
2041       - To turn lambda-splitting for a.sml on with aggressiveness <a> (where
2042         <a> is a decimal non-negative integer):
2043            a.sml (lambdasplitting:<a>)
2044       - To turn lambda-splitting for a.sml on with maximal aggressiveness:
2045            a.sml (lambdasplitting:infinity)
2046       - To use the global default for a.sml:
2047            a.sml (lambdasplitting:default)
2048         or simply
2049            a.sml
2050    
2051    ----------------------------------------------------------------------
2052    Name: Allen Leung
2053    Date: 2001/05/04 01:57:00 EDT
2054    Tag: leunga-20010504-sync
2055    Description:
2056    
2057      MLRISC features.
2058    
2059      1. Fix to CMPXCHG instructions.
2060      2. Changed RA interface to allow annotations in callbacks.
2061      3. Added a new method to the stream interface to allow annotations updates.
2062    
2063    ----------------------------------------------------------------------
2064    Name: Matthias Blume
2065    Date: 2001/05/01 11:45:00 EDT
2066    Tag: blume-20010501-pcedittmp
2067    Description:
2068    
2069    Changed install.sh to use the current working directory instead of
2070    /usr/tmp for a temporary file (pcedittmp).  The previous choice
2071    of /usr/tmp caused trouble with MacOS X because of file premission
2072    problems.
2073    
2074    ----------------------------------------------------------------------
2075    Name: Matthias Blume
2076    Date: 2001/04/20 11:10:00 EDT
2077    Tag: blume-20010420-inMLflag
2078    Description:
2079    
2080     - added vp_limitPtrMask to vproc-state.h
2081       (for use by the raw-C-calls mechanism to implement proper interrupt
2082        handling)
2083     - made the ML compiler aware of various data-structure offsets so it
2084       can generate code for accessing the vp_inML flag and vp_limitPtrMask
2085     - tweaked mlriscGen.sml to have it emit interrupt-handling code for
2086       raw C-calls
2087    
2088    ----------------------------------------------------------------------
2089    Name: Lal George
2090    Date: 2001/04/20 09:15:28 EDT
2091    Tag: george-20010420-macosX
2092    Description:
2093    
2094     - Changes to port to Mac OS X; Darwin.
2095    
2096     - In the process I found that sqrt was broken on the PPC, because the
2097       fsqrt instruction is not implemented.
2098    
2099    ----------------------------------------------------------------------
2100    Name: Matthias Blume
2101    Date: 2001/04/18 12:45:00 EDT
2102    Tag: blume-20010418-ccalls
2103    Description:
2104    
2105     - fixed two off-by-4 errors in the x86-specific c-calls implementation
2106       (this bug prevented structure arguments containing pointers from being
2107        passed correctly)
2108     - changed the raw-C-call code in mlriscGen.sml in such a way that
2109       structure arguments are represented as a pointer to the beginning
2110       of the structure (instead of having a series of synthesized arguments,
2111       one for each structure member)
2112    
2113     - made makeml script's verbosity level configurable via environment
2114       variable (MAKEML_VERBOSITY)
2115    
2116     - eliminated placeholder implementations for f32l, w16s, i16s, and f32s
2117       in rawmem-x86.sml; we are now using the real thing
2118    
2119    ----------------------------------------------------------------------
2120    Name: Matthias Blume
2121    Date: 2001/03/22 16:25:00 EST
2122    Tag: blume-20010322-bootfiles
2123    Description:
2124    
2125    Created a new set of bootfiles (for your automatic installation convenience).
2126    
2127    ----------------------------------------------------------------------
2128    Name: Matthias Blume
2129    Date: 2001/03/22 15:10:00 EST
2130    Tag: blume-20010322-rawmem-parcm
2131    Description:
2132    
2133    1. All "raw memory access" primitives for the new FFI are implemented now
2134       (at least on the x86).
2135    2. Some further cleanup of CM's parallel make mechanism.
2136    
2137    ----------------------------------------------------------------------
2138    Name: Matthias Blume
2139    Date: 2001/03/19 17:53:00 EST
2140    Tag: blume-20010319-parallel
2141    Description:
2142    
2143    Parallel make (using compile servers) now works again.
2144    
2145    To this end, CM.stabilize and CMB.make have been modified to work in
2146    two passes when compile servers are attached:
2147       1. Compile everything, do not perform stabilization; this pass
2148          uses compile servers
2149       2. Stabilize everything; this pass does not use compile servers
2150    If there are no compile servers, the two passes are combined into one
2151    (as before).  Splitting the passes increases the inherent parallelism
2152    in the dependency graph because the entire graph including all
2153    libraries is available at the same time.  This, in turn, improves
2154    server utilization.  The downside is that the master process will
2155    have to do some extra work after compilation is done (because for
2156    technical reasons it must re-read all the binfiles during stabilization).
2157    
2158    ----------------------------------------------------------------------
2159    Name: Matthias Blume
2160    Date: 2001/03/16 12:22:00 EST
2161    Tag: blume-20010316-bootfiles
2162    Description:
2163    
2164    Created a new set of bootfiles (for your automatic installation convenience).
2165    
2166    ----------------------------------------------------------------------
2167    Name: Matthias Blume
2168    Date: 2001/03/16 11:00:00 EST
2169    Tag: blume-20010316-MLTREE-fixup
2170    Description:
2171    
2172    This is a minor fixup for an (untagged) earlier commit by Allen.
2173    (A file was missing).
2174    
2175    ----------------------------------------------------------------------
2176    Name: Allen Leung
2177    Date: Mon Mar  5 18:54:57 EST 2001
2178    Tag: leunga-20010305-cut-support
2179    
2180    1. New support for alternative control-flow in MLTREE.
2181       Currently we support
2182    
2183          FLOW_TO(CALL ...., [k1,...,kn])
2184    
2185       This is needed for 'cuts to' in C-- and try/handle-like constructs
2186       in Moby
2187    
2188       New assembler flag "asm-show-cutsto" to turn on control-flow debugging.
2189    
2190    2. Register Allocator
2191    
2192       Changes in interface [from Fermin, John]
2193    
2194    3. Alpha 8-bit SLL support [Fermin]
2195    
2196    4. All architectures
2197    
2198       A new module (ClusterExpandCopies) for expanding parallel copies.
2199    
2200    ----------------------------------------------------------------------
2201    Name: Allen Leung
2202    Date: 2001/02/27 23:07:00 EST
2203    Tag: leunga-20010227-minor-stuff
2204    
2205    1. Alpha bug fix for CMOVNE
2206    2. Handle mltree COND(..,FCMP ...,...)
2207    3. Bug fix in simplifier
2208    
2209    ----------------------------------------------------------------------
2210    Name: Matthias Blume
2211    Date: 2001/01/30 17:50:00 EST
2212    Tag: blume-20010130-sync
2213    Description:
2214    
2215    This is just a minor update to sync my devel branch with the main brach.
2216    The only visible change is the addition of some README files.
2217    
2218    ----------------------------------------------------------------------
2219    Name: Matthias Blume
2220    Date: 2001/01/12 23:30:00 JST
2221    Tag: blume-20010112-bootfiles
2222    Description:
2223    
2224    Made a new set of bootfiles that goes with the current state of the
2225    repository.
2226    
2227    ----------------------------------------------------------------------
2228    Name: Matthias Blume
2229    Date: 2001/01/12 21:20:00 JST
2230    Tag: blume-20010112-sync
2231    Description:
2232    
2233    I am just flushing out some minor changes that had accumulated in
2234    my private branch in order to sync with the main tree.  (This is
2235    mainly because I had CVS trouble when trying to merge _into_ my
2236    private branch.)
2237    
2238    Most people should be completely unaffected by this.
2239    
2240    ----------------------------------------------------------------------
2241    Name: Allen Leung
2242    Date: Thu Jan 11 21:03:00 EST 2001
2243    Tag: leunga-20010111-labexp=mltree
2244    Description:
2245    
2246    1.  Removed the type LabelExp and replace it by MLTree.
2247    2.  Rewritten mltree-simplify with the pattern matcher tool.
2248    3.  There were some bugs in alpha code generator which would break
2249        64-bit code generation.
2250    4.  Redo the tools to generate code with the
2251    5.  The CM files in MLRISC (and in src/system/smlnj/MLRISC)
2252        are now generated by perl scripts.
2253    
2254    ----------------------------------------------------------------------
2255    Name: Matthias Blume
2256    Date: 2001/01/10 21:55:00 JST
2257    Tag: blume-20010110-rcc
2258    Description:
2259    
2260    The RCC stuff now seems to work (but only on the x86).
2261    This required hacking of the c-calls interface (and -implementation) in
2262    MLRISC.
2263    
2264    Normal compiler users should be unaffected.
2265    
2266    ----------------------------------------------------------------------
2267    Name: Matthias Blume
2268    Date: 2001/01/09 01:20:00 JST
2269    Tag: blume-20010109-rcc
2270    Description:
2271    
2272    This is a fairly big patch, flushing out a large number of pending
2273    changes that I made to my development copy over the last couple of days.
2274    
2275    Of practical relevance at this moment is a workaround for a pickling
2276    bug that Allen ran into the other day.  The cause of the bug itself is
2277    still unknown and it might be hard to fix it properly, but the
2278    workaround has some merits of its own (namely somewhat reducing pickling
2279    overhead for certain libraries).  Therefore, I think this solution should
2280    be satisfactory at this time.
2281    
2282    The rest of the changes (i.e., the vast majority) has to do with my
2283    ongoing efforts of providing direct support for C function calls from
2284    ML.  At the moment there is a new primop "RAW_CCALL", typing magic
2285    in types/cproto.sml (invoked from FLINT/trans/translate.sml), a new
2286    case in the FLINT CPS datatype (RCC), changes to cps/convert.sml to
2287    translate uses of RAW_CCALL into RCC, and changes to mlriscGen.sml to
2288    handle RCC.
2289    
2290    The last part (the changes to mlriscGen.sml) are still known to be
2291    wrong on the x86 and not implemented on all other architectures.  But
2292    the infrastructure is in place. I had to change a few functor
2293    signatures in the backend to be able to route the CCalls interface
2294    from MLRISC there, and I had to specialize the mltree type (on the
2295    x86) to include the necessary extensions. (The extensions themselves
2296    were already there and redy to go in MLRISC/x86).
2297    
2298    Everything should be very happy as soon as someone helps me with
2299    mlriscGen.sml...
2300    
2301    In any case, nothing of this should matter to anyone as long as the
2302    new primop is not being used (which is going to be the case unless you
2303    find it where I hid it :). The rest of the compiler is completely
2304    unaffected.
2305    
2306    ----------------------------------------------------------------------
2307    Name: Matthias Blume
2308    Date: 2001/01/05 00:30:00 JST
2309    Tag: blume-20010105-primops
2310    Description:
2311    
2312    Added some experimental support for work that I am doing right now.
2313    These changes mostly concern added primops, but there is also a new
2314    experimental C library in the runtime system (but currently not enabled
2315    anywhere except on Linux/X86).
2316    
2317    In the course of adding primops (and playing with them), I discovered that
2318    Zhong's INL_PRIM hack (no type info for certain primops) was, in fact, badly
2319    broken.  (Zhong was very right he labeled this stuff as "major gross hack".)
2320    To recover, I made type information in INL_PRIM mandatory and changed
2321    prim.sml as well as built-in.sml accordingly.  The InLine structure now
2322    has complete, correct type information (i.e., no bottom types).
2323    
2324    Since all these changes mean that we need new binfiles, I also bumped the
2325    version number to 110.32.1.
2326    
2327    ----------------------------------------------------------------------
2328    Name: Matthias Blume
2329    Date: 2000/12/30 22:10:00 JST
2330    Tag: blume-20001230-various
2331    Description:
2332    
2333    Added proxy libraries for MLRISC and let MLRISC libraries refer
2334    to each other using path anchors.  (See CM manual for explanation.)
2335    
2336    Updated CM documentation.
2337    
2338    Fixed some bugs in CM.
2339    
2340    Implemented "proxy" libraries (= syntactic sugar for CM).
2341    
2342    Added "-quiet" option to makeml and changed runtime system accordingly.
2343    
2344    Added cleanup handler for exportML to reset timers and compiler stats.
2345    
2346    ----------------------------------------------------------------------
2347    Name: Lal George
2348    Date: 2000/12/22 22:22:58 EST 2000
2349    Tag: Release_110_32
2350    Description:
2351    
2352            Infinite precision used throughout MLRISC.
2353            see MLRISC/mltree/machine-int.sig
2354    
2355    ----------------------------------------------------------------------
2356    Name: Matthias Blume
2357    Date: 2000/12/22 23:16:00 JST
2358    Tag: blume-20001222-warn
2359    Description:
2360    
2361    Corrected wording and formatting of some CM warning message which I
2362    broke in my previous patch.
2363    
2364    ----------------------------------------------------------------------
2365    Name: Matthias Blume
2366    Date: 2000/12/22 21:20:00 JST
2367    Tag: blume-20001222-anchorenv
2368    Description:
2369    
2370    Fixed CM's handling of anchor environments in connection with CMB.make.
2371    
2372  ----------------------------------------------------------------------  ----------------------------------------------------------------------
2373  Name: Matthias Blume  Name: Matthias Blume
2374  Date: 2000/12/22 13:15:00 JST  Date: 2000/12/22 13:15:00 JST
# Line 1788  Line 4146 
4146       elaborator). There were a lot of changes during my "linkpath" trials       elaborator). There were a lot of changes during my "linkpath" trials
4147       that could have been reverted to their original state but weren't.       that could have been reverted to their original state but weren't.
4148       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
4149       than what was strictly necessary...  (I _did_ resist the tempation       than what was strictly necessary...  (I _did_ resist the temptation
4150       of doing any "global reformatting" to avoid an untimely death at       of doing any "global reformatting" to avoid an untimely death at
4151       Dave's hands. :)       Dave's hands. :)
4152    

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