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Diff of /sml/trunk/HISTORY

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revision 635, Tue May 2 15:09:12 2000 UTC revision 1076, Tue Feb 19 15:47:18 2002 UTC
# Line 8  Line 8 
8  The form of an entry should be:  The form of an entry should be:
9    
10  Name:  Name:
11  Date:  Date: yyyy/mm/dd
12  Tag: <post-commit CVS tag>  Tag: <post-commit CVS tag>
13  Description:  Description:
14    
15    ----------------------------------------------------------------------
16    Name: Matthias Blume
17    Date: 2002/02/19 10:48:00 EST
18    Tag: blume-20020219-pqfix
19    Description:
20    
21    Applied Chris Okasaki's bug fix for priority queues.
22    
23    ----------------------------------------------------------------------
24    Name: Matthias Blume
25    Date: 2002/02/15 17:05:00
26    Tag: Release_110_39
27    Description:
28    
29    Last-minute retagging is becoming a tradition... :-(
30    
31    This is the working release 110.39.
32    
33    ----------------------------------------------------------------------
34    Name: Matthias Blume
35    Date: 2002/02/15 16:00:00 EST
36    Tag: Release_110_39-orig
37    Description:
38    
39    Working release 110.39.  New bootfiles.
40    
41    (Update: There was a small bug in the installer so it wouldn't work
42    with all shells.  So I retagged. -Matthias)
43    
44    ----------------------------------------------------------------------
45    Name: Matthias Blume
46    Date: 2002/02/15 14:17:00 EST
47    Tag: blume-20020215-showbindings
48    Description:
49    
50    Added EnvRef.listBoundSymbols and CM.State.showBindings.  Especially
51    the latter can be useful for exploring what bindings are available at
52    the interactive prompt.  (The first function returns only the list
53    of symbols that are really bound, the second prints those but also the
54    ones that CM's autoloading mechanism knows about.)
55    
56    ----------------------------------------------------------------------
57    Name: Matthias Blume
58    Date: 2002/02/15 12:08:00 EST
59    Tag: blume-20020215-iptrs
60    Description:
61    
62    Two improvements to ml-nlffigen:
63    
64      1. Write files only if they do not exist or if their current contents
65         do not coincide with what's being written.  (That is, avoid messing
66         with the time stamps unless absolutely necessary.)
67    
68      2. Implement a "repository" mechanism for generated files related
69         to "incomplete pointer types".   See the README file for details.
70    
71    ----------------------------------------------------------------------
72    Name: Matthias Blume
73    Date: 2002/02/14 11:50:00 EST
74    Tag: blume-20020214-quote
75    Description:
76    
77    Added a type 't t_' to tag.sml (in ml-nlffi-lib.cm).  This is required
78    because of the new and improved tag generation scheme.  (Thanks to Allen
79    Leung for pointing it out.)
80    
81    ----------------------------------------------------------------------
82    Name: Lal George
83    Date: 2002/02/14 09:55:27 EST 2002
84    Tag: george-20020214-isabelle-bug
85    Description:
86    
87    Fixed the MLRISC bug sent by Markus Wenzel regarding the compilation
88    of Isabelle on the x86.
89    
90    From Allen:
91    -----------
92     I've found the problem:
93    
94         in ra-core.sml, I use the counter "blocked" to keep track of the
95         true number of elements in the freeze queue.  When the counter goes
96         to zero, I skip examining the queue.  But I've messed up the
97         bookkeeping in combine():
98    
99             else ();
100             case !ucol of
101               PSEUDO => (if !cntv > 0 then
102                     (if !cntu > 0 then blocked := !blocked - 1 else ();
103                                        ^^^^^^^^^^^^^^^^^^^^^^^
104                      moveu := mergeMoveList(!movev, !moveu)
105                     )
106                  else ();
107    
108         combine() is called to coalesce two nodes u and v.
109         I think I was thinking that if the move counts of u and v are both
110         greater than zero then after they are coalesced then one node is
111         removed from the freeze queue.  Apparently I was thinking that
112         both u and v are of low degree, but that's clearly not necessarily true.
113    
114    
115    02/12/2002:
116        Here's the patch.  HOL now compiles.
117    
118        I don't know how this impact on performance (compile
119        time or runtime).  This bug caused the RA (especially on the x86)
120        to go thru the potential spill phase when there are still nodes on the
121        freeze queue.
122    
123    
124    
125    
126    ----------------------------------------------------------------------
127    Name: Matthias Blume
128    Date: 2002/02/13 22:40:00 EST
129    Tag: blume-20020213-fptr-rtti
130    Description:
131    
132    Fixed a bug in ml-nlffigen that was introduced with one of the previous
133    updates.
134    
135    ----------------------------------------------------------------------
136    Name: Matthias Blume
137    Date: 2002/02/13 16:41:00 EST
138    Tag: blume-20020213-cmlpq
139    Description:
140    
141    Added new priority queue export symbols (which have just been added to
142    smlnj-lib.cm) to CML's version of smlnj-lib.cm.  (Otherwise CML would
143    not compile and the installer would choke.)
144    
145    ----------------------------------------------------------------------
146    Name: Matthias Blume
147    Date: 2002/02/13 16:15:00 EST
148    Tag: blume-20020213-various
149    Description:
150    
151    1. More tweaks to ml-nlffigen:
152    
153       - better internal datastructures (resulting in slight speedup)
154       - "-match" option requires exact match
155       - "localized" gensym counters (untagged structs/unions nested within
156         other structs/unions or within typedefs get a fresh counter; their
157         tag will be prefixed by a concatenation of their parents' tags)
158       - bug fixes (related to calculation of transitive closure of types
159         to be included in the output)
160    
161    2. Minor Basis updates:
162    
163       - added implementations for List.collate and Option.app
164    
165    ----------------------------------------------------------------------
166    Name: Matthias Blume
167    Date: 2002/02/11 15:55:00 EST
168    Tag: blume-20020211-gensym
169    Description:
170    
171    Added a "-gensym" option to command line of ml-nlffigen.  This can be
172    used to specify a "stem" -- a string that is inserted in all "gensym'd"
173    names (ML structure names that correspond to unnamed C structs, unions,
174    and enums), so that separate runs of ml-nlffigen do not clash.
175    
176    ----------------------------------------------------------------------
177    Name: Matthias Blume
178    Date: 2002/02/11 12:05:00 EST
179    Tag: blume-20020211-gensml
180    Description:
181    
182    A quick fix for a problem with GenSML (in the pgraph-util library):
183    Make generation of toplevel "local" optional.  (Strictly speaking,
184    signature definitions within "local" are not legal SML.)
185    
186    Other than that: updates to INSTALL and cm/TODO.
187    
188    ----------------------------------------------------------------------
189    Name: Matthias Blume
190    Date: 2002/02/08 15:00:00 EST
191    Tag: blume-20020208-uniquepid
192    Description:
193    
194    0. Version number has been bumped to 110.38.1.  NEW BOOTFILES!!!
195    
196    1. The installer (config/install.sh) has gotten smarter:
197    
198         - Configuration options are a bit easier to specify now
199           (in config/targets).
200         - Bug in recognizing .tar.bz2 files fixed.
201         - Installer automatically resolves dependencies between
202           configuration options (e.g., if you ask for eXene, you will
203           also get cml -- regardless whether you asked for it or not).
204         - Installer can run in "quieter mode" by setting the environment
205           variable INSTALL_QUIETLY to "true".  "Quieter" does not mean
206           "completely silent", though.
207         - Build HashCons library as part of smlnj-lib.
208    
209    2. A new scheme for assigning persistent identifiers to compilation
210       units (and, by extension, to types etc.) has been put into place.
211       This fixes a long-standing bug where types and even dynamic values
212       can get internally confused, thereby compromising type safety
213       (abstraction) and dynamic correctness.  See
214    
215         http://cm.bell-labs.com/cm/cs/who/blume/pid-confusion.tgz
216    
217       for an example of how things could go wrong until now.
218    
219       The downside of the new scheme is that pids are not quite as
220       persistent as they used to be: CM will generate a fresh pid
221       for every compilation unit that it thinks it sees for the first
222       time.  That means that if you compile starting from a clean, fresh
223       source tree at two different times, you end up with different
224       binaries.
225    
226       Cutoff recompilation, however, has not been compromised because
227       CM keeps pid information in special caches between runs.
228    
229    ----------------------------------------------------------------------
230    Name: Lal George
231    Date: 2002/02/07 15:34:13 EST 2002
232    Tag: <none>
233    Description:
234    
235    Compilers that generate assembly code may produce  global labels
236    whose value is resolved at link time. The various peephole optimization
237    modules did not take this in account.
238    
239    TODO. The Labels.addrOf function should really return an option
240    type so that clients are forced to deal with this issue, rather
241    than an exception being raised.
242    
243    ----------------------------------------------------------------------
244    Name: Lal George
245    Date: 2002/02/06 13:55:02 EST
246    Tag: george-20020206-ra-breakup
247    Description:
248    
249    1. A bug fix from Allen.
250    
251        A typo causes extra fstp %st(0)'s to be generated at compensation
252        edges, which might cause stack underflow traps at runtime.  This
253        occurs in fft where there are extraneous fstps right before the 'into'
254        trap instruction (in this case they are harmless since none of the
255        integers overflow.)
256    
257    2. Pulled out various utility modules that were embedded in the modules
258       of the register allocator. I need these modules for other purposes, but
259       they are not complete enough to put into a library (just yet).
260    ----------------------------------------------------------------------
261    Name: Matthias Blume
262    Date: 2002/01/31 16:05:00 EST
263    Tag: blume-20020131-sparc-ccalls
264    Description:
265    
266    1. C-calls on Sparc needlessly allocated a huge chunk (96 bytes)
267       of extra stack space by mistake.  Fixed.
268    
269    2. Bug in logic of handling of command-line options in ml-nlffigen fixed.
270    
271    ----------------------------------------------------------------------
272    Name: Allen Leung
273    Date: 2002/01/30
274    Tag: leunga-20020130-nowhere-bug-fix
275    Description:
276    
277       MLRISC bug fixes:
278       1. Fixed a bindings computation bug in the 'nowhere' program generator tool.
279       2. MachineInt.fromString was negating its value.
280    
281    ----------------------------------------------------------------------
282    Name: Matthias Blume
283    Date: 2002/01/29
284    Tag: blume-20020129-INSTALL
285    Description:
286    
287    - Added somewhat detailed installation instructions (file INSTALL).
288    - Fixed curl-detection bug in config/install.sh.
289    - It is now possible to select the URL getter using the URLGETTER
290      environment variable:
291    
292          not set / "unknown"      --> automatic detection (script tries wget,
293                                       curl, and lynx)
294          "wget" / "curl" / "lynx" --> use the specified program (script "knows"
295                                       how to properly invoke them)
296          other                    --> use $URLGETTER directly, it must take
297                                       precisely two command-line arguments
298                                       (source URL and destination file name)
299    
300    ----------------------------------------------------------------------
301    Name: Matthias Blume
302    Date: 2002/01/28
303    Tag: blume-20020128-sparc-ccalls
304    Description:
305    
306    - Fixed problem with calculation of "used" registers in sparc-c-calls.
307    - Make use of the allocParam argument in sparc-c-calls.
308    
309    ----------------------------------------------------------------------
310    Name: Matthias Blume
311    Date: 2002/01/28
312    Tag: blume-20020128-allocParam
313    Description:
314    
315    John Reppy:  Changes c-calls API to accept client-callback for
316    allocating extra stack space.
317    me: Corresponding changes to mlriscGen (using a dummy argument that
318        does not change the current behavior).
319    
320    ----------------------------------------------------------------------
321    Name: Matthias Blume
322    Date: 2002/01/28 12:00:00
323    Tag: Release_110_38
324    Description:
325    
326    This time for real!!!
327    
328    ----------------------------------------------------------------------
329    Name: Matthias Blume
330    Date: 2002/01/28 10:56:00 EST
331    Tag: blume-20020128-retraction
332    Description:
333    
334    0. Retracted earlier 110.38.  (The Release_110_38 tag has been replaced
335       with blume-Release_110_38-retracted.)
336    
337    1. Fixed a problem with incorrect rounding modes in real64.sml.
338       (Thanks to Andrew Mccreight <andrew.mccreight@yale.edu>.)
339    
340    2. A bug in ml-nlffigen related to the handling of unnamed structs, unions,
341       and enums fixed.  The naming of corresponding ML identifiers should
342       now be consistent again.
343    
344    ----------------------------------------------------------------------
345    Name: Allen Leung
346    Date: 2002/01/27
347    Tag: leunga-20020127-nowhere
348    Description:
349    
350       Added a target called nowhere in the configuration scripts.
351       Enabling this will build the MLRISC 'nowhere' tool (for translating
352       programs with where-clauses into legal SML code) during installation.
353    
354    ----------------------------------------------------------------------
355    Name: Matthias Blume
356    Date: 2002/01/25 21:27:00 EST
357    Tag: blume-Release_110_38-retracted
358    Description:
359    
360    Call it a (working) release!  Version is 110.38. Bootfiles are ready.
361    
362    README will be added later.
363    
364    !!! NOTE:  Re-tagged as blume-Release_110_38-retracted. Original tag
365    (Release_110_38) removed.  Reason: Last-minute bug fixes.
366    
367    ----------------------------------------------------------------------
368    Name: Matthias Blume
369    Date: 2002/01/25
370    Tag: blume-20020125-ffi
371    Description:
372    
373    A large number of tweaks and improvements to ml-nlffi-lib and
374    ml-nlffigen:
375    
376       - ML represenation types have been streamlined
377       - getter and setter functions work with concrete values, not abstract
378         ones where possible
379       - ml-nlffigen command line more flexible (see README file there)
380       - some bugs have been fixed (hopefully)
381    
382    ----------------------------------------------------------------------
383    Name: Lal George
384    Date: 2002/01/24
385    Tag: george-20020124-risc-ra-interface
386    Description:
387    
388       There is a dramatic simplification in the interface to the
389       register allocator for RISC architectures as a result of making
390       parallel copy instructions explicit.
391    
392    ----------------------------------------------------------------------
393    Name: Matthias Blume
394    Date: 2002/01/22
395    Tag: blume-20020122-x86-ccalls
396    Description:
397    
398    Bug fix for c-calls on x86 (having to do with how char- and
399    short-arguments are being handled).
400    
401    ----------------------------------------------------------------------
402    Name: Matthias Blume
403    Date: 2002/01/21
404    Tag: blume-20020121-ff
405    Description:
406    
407    Another day of fiddling with the FFI...
408    
409    1. Bug fix/workaround:  CKIT does not complain about negative array
410       dimensions, so ml-nlffigen has to guard itself against this possibility.
411       (Otherwise a negative dimension would send it into an infinite loop.)
412    
413    2. Some of the abstract types (light objects, light pointers, most "base"
414       types) in structure C are now eqtypes.
415    
416    3. Added constructors and test functions for NULL function pointers.
417    
418    ----------------------------------------------------------------------
419    Name: Matthias Blume
420    Date: 2002/01/18
421    Tag: blume-20020118-ready-for-new-release
422    Description:
423    
424    Made config/srcarchiveurl point to a new place.  (Will provide boot
425    files shortly.)
426    
427    Maybe we christen this to be 110.38?
428    
429    ----------------------------------------------------------------------
430    Name: Matthias Blume
431    Date: 2002/01/18
432    Tag: blume-20020118-more-ffifiddle
433    Description:
434    
435    Today's FFI fiddling:
436    
437      - Provided a structure CGetSet with "convenient" versions of C.Get.* and
438        C.Set.* that use concrete (MLRep.*) arguments and results instead
439        of abstract ones.
440    
441      - Provided word-style bit operations etc. for "int" representation
442        types in MLRep.S<Foo>Bitops where <Foo> ranges over Char, Int, Short,
443        and Long.
444    
445    ----------------------------------------------------------------------
446    Name: Matthias Blume
447    Date: 2002/01/18
448    Tag: blume-20020118-use-x86-fp
449    Description:
450    
451    Now that x86-fast-fp seems to be working, I turned it back on again
452    by default.  (Seems to work fine now, even with the FFI.)
453    
454    Other than that, I added some documentation about the FFI to
455    src/ml-nlffigen/README and updated the FFI test examples in
456    src/ml-nlffi-lib/Tests/*.
457    
458    ----------------------------------------------------------------------
459    Name: Allen Leung
460    Date: 2002/01/17
461    Tag: leunga-20020117-x86-fast-fp-call
462    Description:
463    
464       1. Fixed a problem with handling return fp values when x86's fast fp
465          mode is turned on.
466    
467       2. Minor pretty printing fix for cellset.  Print %st(0) as %st(0) instead
468          of %f32.
469    
470       3. Added a constructor INT32lit to the ast of MLRISC tools.
471    
472    ----------------------------------------------------------------------
473    Name: Matthias Blume
474    Date: 2002/01/16
475    Tag: blume-20020116-ffifiddle
476    Description:
477    
478    More fiddling with the FFI interface:
479    
480     - Make constness 'c instead of rw wherever possible.  This eliminates
481       the need for certain explicit coercions.  (However, due to ML's
482       value polymorphism, there will still be many cases where explicit
483       coercions are necessary.  Phantom types are not the whole answer
484       to modeling a subtyping relationship in ML.)
485    
486     - ro/rw coersions for pointers added.  (Avoids the detour through */&.)
487    
488     - "printf" test example added to src/ml-nlffi-lib/Tests.  (Demonstrates
489       clumsy workaround for varargs problem.)
490    
491    ----------------------------------------------------------------------
492    Name: Lal George
493    Date: 2002/01/15
494    Tag: <none>
495    Description:
496    
497    1. Since COPY instructions are no longer native to the architecture,
498       a generic functor can be used to implement the expandCopies function.
499    
500    2. Allowed EXPORT and IMPORT pseudo-op declarations to appear inside a
501       TEXT segment.
502    
503    ----------------------------------------------------------------------
504    Name: Matthias Blume
505    Date: 2002/01/15
506    Tag: blume-20020115-ffiupdates
507    Description:
508    
509    1. Fix for bug resulting in single-precision float values being returned
510       incorrectly from FFI calls.
511    
512    2. Small modifications to C FFI API:
513    
514        - memory-allocation routines return straight objects (no options)
515          and raise an exception in out-of-memory situations
516        - unsafe extensions to cast between function pointers and pointers
517          from/to ints
518        - added structure C_Debug as an alternative to structure C where
519          pointer-dereferencing (|*| and |*!) always check for null-pointers
520        - added open_lib' to DynLinkage;  open_lib' works like open_lib
521          but also takes a (possibly empty) list of existing library handles
522          that the current library depends on
523    
524    ----------------------------------------------------------------------
525    Name: Matthias Blume
526    Date: 2002/01/10
527    Tag: blume-20020110-newffigen
528    Description:
529    
530    1. Updates to portable graph code.
531    
532    2. Major update to ml-nlffigen and ml-nlffi-lib.  Things are much
533       more scalable now so that even huge interfaces such as the one
534       for GTK compile in finite time and space. :-)
535       See src/ml-nlffigen/README for details on what's new.
536    
537    ----------------------------------------------------------------------
538    Name: Lal George
539    Date: 2001/01/09 14:31:35 EST 2002
540    Tag: george-20011206-rm-native-copy
541    Description:
542    
543            Removed the native COPY and FCOPY instructions
544            from all the architectures and replaced it with the
545            explicit COPY instruction from the previous commit.
546    
547            It is now possible to simplify many of the optimizations
548            modules that manipulate copies. This has not been
549            done in this change.
550    
551    ----------------------------------------------------------------------
552    Name: Lal George
553    Date: 2001/12/06 16:50:13 EST 2001
554    Tag: george-20011206-mlrisc-instruction
555    Description:
556    
557    Changed the representation of instructions from being fully abstract
558    to being partially concrete. That is to say:
559    
560      from
561            type instruction
562    
563      to
564            type instr                              (* machine instruction *)
565    
566            datatype instruction =
567                LIVE of {regs: C.cellset, spilled: C.cellset}
568              | KILL of {regs: C.cellset, spilled: C.cellset}
569              | COPYXXX of {k: CB.cellkind, dst: CB.cell list, src: CB.cell list}
570              | ANNOTATION of {i: instruction, a: Annotations.annotation}
571              | INSTR of instr
572    
573    This makes the handling of certain special instructions that appear on
574    all architectures easier and uniform.
575    
576    LIVE and KILL say that a list of registers are live or killed at the
577    program point where they appear. No spill code is generated when an
578    element of the 'regs' field is spilled, but the register is moved to
579    the 'spilled' (which is present, more for debugging than anything else).
580    
581    LIVE replaces the (now deprecated) DEFFREG instruction on the alpha.
582    We used to generate:
583    
584            DEFFREG f1
585            f1 := f2 + f3
586            trapb
587    
588    but now generate:
589    
590            f1 := f2 + f3
591            trapb
592            LIVE {regs=[f1,f2,f3], spilled=[]}
593    
594    Furthermore, the DEFFREG (hack) required that all floating point instruction
595    use all registers mentioned in the instruction. Therefore f1 := f2 + f3,
596    defines f1 and uses [f1,f2,f3]! This hack is no longer required resulting
597    in a cleaner alpha implementation. (Hopefully, intel will not get rid of
598    this architecture).
599    
600    COPYXXX is intended to replace the parallel COPY and FCOPY  available on
601    all the architectures. This will result in further simplification of the
602    register allocator that must be aware of them for coalescing purposes, and
603    will also simplify certain aspects of the machine description that provides
604    callbacks related to parallel copies.
605    
606    ANNOTATION should be obvious, and now INSTR represents the honest to God
607    machine instruction set!
608    
609    The <arch>/instructions/<arch>Instr.sml files define certain utility
610    functions for making porting easier -- essentially converting upper case
611    to lower case. All machine instructions (of type instr) are in upper case,
612    and the lower case form generates an MLRISC instruction. For example on
613    the alpha we have:
614    
615      datatype instr =
616         LDA of {r:cell, b:cell, d:operand}
617       | ...
618    
619      val lda : {r:cell, b:cell, d:operand} -> instruction
620        ...
621    
622    where lda is just (INSTR o LDA), etc.
623    
624    ----------------------------------------------------------------------
625    Name: Matthias Blume
626    Date: 2001/11/22 21:40:00 EST
627    Tag: Release_110_37
628    Description:
629    
630    Release 110.37.  This time for real.
631    
632    ----------------------------------------------------------------------
633    Name: Matthias Blume
634    Date: 2001/11/21 16:35:00 EST
635    Tag: blume-20011121-foot-in-mouth
636    Description:
637    
638    Removed the "Release_110_37" tag because of a serious bug.
639    This will be re-tagged once the bug is fixed.
640    
641    ----------------------------------------------------------------------
642    Name: Matthias Blume
643    Date: 2001/11/21 16:14:00 EST
644    Tag: blume-20011121-forgottenfile
645    Description:
646    
647    Forgot to add a file.  (Just a .tex-file -- part of
648    the CM manual source.)
649    
650    ----------------------------------------------------------------------
651    Name: Matthias Blume
652    Date: 2001/11/21 16:10:00 EST
653    Tag: blume-20011121-invalid_110_37
654    Description:
655    
656    Note: I removed the original tag "Release_110_37" from this commit
657          because we found a serious bug in all non-x86 backends.
658          - Matthias
659    
660    1. Modifications to the SML/NJ code generator and to the runtime system
661       so that code object name strings are directly inserted into code
662       objects at code generation time.  The only business the runtime system
663       has with this is now to read the name strings on occasions.
664       (The encoding of the name string has also changed somewhat.)
665    
666    2. CM now implements a simple "set calculus" for specifying export lists.
667       In particular, it is now possible to refer to the export lists of
668       other libraries/groups/sources and form unions as well as differences.
669       See the latest CM manual for details.
670    
671    3. An separate notion of "proxy" libraries has again be eliminated from
672       CM's model.  (Proxy libraries are now simply a special case of using
673       the export list calculus.)
674    
675    4. Some of the existing libraries now take advantage of the new set
676       calculus.
677       (Notice that not all libraries have been converted because some
678       of the existing .cm-files are supposed to be backward compatible
679       with 110.0.x.)
680    
681    5. Some cleanup in stand-alone programs.  (Don't use "exnMessage" -- use
682       "General.exnMessage"!  The former relies on a certain hook to be
683       initialized, and that often does not happen in the stand-alone case.)
684    
685    ----------------------------------------------------------------------
686    Name: Lal George
687    Date: 2001/11/21  13:56:18 EST
688    Tag: george-2001121-pseudo-ops
689    Description:
690    
691      Implemented a complete redesign of MLRISC pseudo-ops. Now there
692      ought to never be any question of incompatabilities with
693      pseudo-op syntax expected by host assemblers.
694    
695      For now, only modules supporting GAS syntax are implemented
696      but more should follow, such as MASM, and vendor assembler
697      syntax, e.g. IBM as, Sun as, etc.
698    
699    ----------------------------------------------------------------------
700    Name: Matthias Blume
701    Date: 2001/11/14 11:52:00 EST
702    Tag: blume-20011114-srcname
703    Description:
704    
705    1. Routed the name of the current source file to mlriscgen where it
706       should be directly emitted into the code object.  (This last part
707       is yet to be done.)
708    
709    2. Some cleanup of the pgraph code to make it match the proposal that
710       I put out the other day.  (The proposal notwithstanding, things are
711       still in flux here.)
712    
713    ----------------------------------------------------------------------
714    Name: Lal George
715    Date: 2001/11/14 09:44:04 EST
716    Tag:
717    Description:
718    
719      Fix for a backpatching bug reported by Allen.
720    
721      Because the boundary between short and long span-dependent
722      instructions is +/- 128, there are an astounding number of
723      span-dependent instructions whose size is over estimated.
724    
725      Allen came up with the idea of letting the size of span
726      dependent instructions be non-monotonic, for a maxIter
727      number of times, after which the size must be monotonically
728      increasing.
729    
730      This table shows the number of span-dependent instructions
731      whose size was over-estimated as a function of maxIter, for the
732      file Parse/parse/ml.grm.sml:
733    
734         maxIter            # of instructions:
735            10                      687
736            20                      438
737            30                      198
738            40                        0
739    
740      In compiling the compiler, there is no significant difference in
741      compilation speed between maxIter=10 and maxIter=40. Actually,
742      my measurements showed that maxIter=40 was a tad faster than
743      maxIter=10! Also 96% of the  files in the compiler reach a fix
744      point within 13 iterations, so fixing maxIter at 40, while high,
745      is okay.
746    
747    ----------------------------------------------------------------------
748    Name: Matthias Blume
749    Date: 2001/10/31 15:25:00 EST
750    Tag: blume-20011031-pgraph
751    Description:
752    
753    CKIT:
754    * Changed the "Function" constructor of type Ast.ctype to carry optional
755      argument identifiers.
756    * Changed the return type of TypeUtil.getFunction accordingly.
757    * Type equality ignores the argument names.
758    * TypeUtil.composite tries to preserve argument names but gives up quickly
759      if there is a mismatch.
760    
761    installation script:
762    * attempts to use "curl" if available (unless "wget" is available as well)
763    
764    CM:
765    * has an experimental implementation of "portable graphs" which I will
766      soon propose as an implementation-independent library format
767    * there are also new libraries $/pgraph.cm and $/pgraph-util.cm
768    
769    NLFFI-LIB:
770    * some cleanup (all cosmetic)
771    
772    NLFFIGEN:
773    * temporarily disabled the mechanism that suppresses ML output for
774      C definitions whose identifiers start with an underscore character
775    * generate val bindings for enum constants
776    * user can request that only one style (light or heavy) is being used;
777      default is to use both (command-line arguments: -heavy and -light)
778    * fixed bug in handling of function types involving incomplete pointers
779    * generate ML entry points that take record arguments (i.e., using
780      named arguments) for C functions that have a prototype with named
781      arguments
782      (see changes to CKIT)
783    
784    ----------------------------------------------------------------------
785    Name: Allen Leung
786    Date: 2001/10/27 20:34:00 EDT
787    Tag: leunga-20011027-x86-fast-fp-call
788    Description:
789    
790       Fixed the bug described in blume-20010920-slowfp.
791    
792       The fix involves
793          1. generating FCOPYs in FSTP in ia32-svid
794          2. marking a CALL with the appropriate annotation
795    
796    ----------------------------------------------------------------------
797    Name: Matthias Blume
798    Date: 2001/10/16 11:32:00 EDT
799    Tag: blume-20011016-netbsd
800    Description:
801    
802    Underscore patch from Chris Richards (fixing problem with compiling
803    runtime system under recent NetBSD).
804    
805    ----------------------------------------------------------------------
806    Name: Allen Leung
807    Date: 2001/10/12 17:18:32 EDT 2001
808    Tag: leung-20011012-x86-printflowgraph
809    Description:
810    
811    X86RA now uses a valid (instead of dummy) PrintFlowgraph module.
812    
813    ----------------------------------------------------------------------
814    Name: Lal George
815    Date: 2001/10/11 23:51:34 EDT
816    Tag: george-20011011-too-many-instrs
817    Description:
818    
819    The representation of a program point never expected to see more
820    than 65536 instructions in a basic block!
821    
822    ----------------------------------------------------------------------
823    Name: Lal George
824    Date: 2001/10/09 09:41:37 EDT
825    Tag: george-20011008-mlrisc-labels
826    Description:
827    
828    Changed the machine description files to support printing of
829    local and global labels in assembly code, based on host assembler
830    conventions.
831    
832    ----------------------------------------------------------------------
833    Name: Matthias Blume
834    Date: 2001/09/25 15:25:00 EDT
835    Tag: blume-20010925-exninfo
836    Description:
837    
838    I provided a non-hook implementation of exnName (at the toplevel) and
839    made the "dummy" implementation of exnMessage (at the toplevel) more
840    useful: if nothing gets "hooked in", then at least you are going to
841    see the exception name and a message indicating why you don't see more.
842    
843    [For the time being, programs that need exnMessage and want to use
844    ml-build should either use General.exnMessage (strongly recommended) or
845    refer to structure General at some other point so that CM sees a
846    static dependency.]
847    
848    [Similar remarks go for "print" and "use":  If you want to use their
849    functionality in stand-alone programs generated by ml-build, then use
850    TextIO.output and Backend.Interact.useFile (from $smlnj/compiler.cm).]
851    
852    ----------------------------------------------------------------------
853    Name: Matthias Blume
854    Date: 2001/09/20 17:28:00 EDT
855    Tag: blume-20010920-slowfp
856    Description:
857    
858    Allen says that x86-fast-fp is not safe yet, so I turned it off again...
859    
860    ----------------------------------------------------------------------
861    Name: Matthias Blume
862    Date: 2001/09/20 17:20:00 EDT
863    Tag: blume-20010920-canonicalpaths
864    Description:
865    
866    0. Updated the BOOT file (something that I forgot to do earlier).
867    
868    1. Small internal change to CM so that it avoids "/../" in filenames
869       as much as possible (but only where it is safe).
870    
871    2. Changed config/_run-sml (resulting in a changed bin/.run-sml) so
872       that arguments that contain delimiters are passed through correctly.
873       This change also means that all "special" arguments of the form
874       @SMLxxx... must come first.
875    
876    3. Changed install script to put relative anchor names for tool commands
877       into pathconfig.
878    
879    ----------------------------------------------------------------------
880    Name: Matthias Blume
881    Date: 2001/09/18 15:35:00 EDT
882    Tag: blume-20010918-readme11036
883    Description:
884    
885    Added README files.
886    
887    ----------------------------------------------------------------------
888    Name: Matthias Blume
889    Date: 2001/09/18 11:45:00 EDT
890    Tag: Release_110_36 (retag)
891    Description:
892    
893    Fixed mistake in config/preloads. Retagged as 110.36.
894    
895    ----------------------------------------------------------------------
896    Name: Matthias Blume
897    Date: 2001/09/18 09:40:00 EDT
898    Tag: Release_110_36_orig (tag changed)
899    Description:
900    
901    New version (110.36).  New bootfiles.
902    
903    ----------------------------------------------------------------------
904    Name: Matthias Blume
905    Date: 2001/09/14 16:15:00 EDT
906    Tag: blume-20010914-x86fastfp
907    Description:
908    
909    John committed some changes that Allen made, in particular a (hopefully)
910    correctly working version of the x86-fp module.
911    
912    I changed the default setting of the Control.MLRISC.getFlag "x86-fast-fp"
913    flag to "true".  Everything seems to compile to a fixpoint ok, and
914    "mandelbrot" speeds up by about 15%.
915    
916    ----------------------------------------------------------------------
917    Name: Matthias Blume
918    Date: 2001/09/13 11:20:00 EDT
919    Tag: blume-20010913-minimal
920    Description:
921    
922    1. Stefan Monnier's patch to fix a miscompilation problem that
923       was brought to light by John Reppy's work on Moby.
924    
925    2. Implemented a minimal "structure Compiler" that contains just
926       "version" and "architecture".  The minimal version will be
927       available when the full version is not.  This is for backward-
928       compatibility with code that wants to test Compiler.version.
929    
930    ----------------------------------------------------------------------
931    Name: Matthias Blume
932    Date: 2001/08/28 14:03:00 EDT
933    Tag: blume-20010828-ml-lex
934    Description:
935    
936    Fix for bug 1581, received from Neophytos Michael.
937    
938    ----------------------------------------------------------------------
939    Name: Matthias Blume
940    Date: 2001/08/27 11:20:00 EDT
941    Tag: blume-20010827-readme11035
942    Description:
943    
944    Fleshed out the README file for 110.35.
945    
946    ----------------------------------------------------------------------
947    Name: Matthias Blume
948    Date: 2001/08/24 17:10:00 EDT
949    Tag: Release_110_35
950    Description:
951    
952    New version number (110.35).  New bootfiles.
953    
954    ----------------------------------------------------------------------
955    Name: Lal George
956    Date: 2001/08/24 13:47:18 EDT 2001
957    Tag: george-20010824-MLRISC-graphs
958    Description:
959    
960     removed clusters from MLRISC completely and replaced with graphs.
961    
962    ----------------------------------------------------------------------
963    Name: Matthias Blume
964    Date: 2001/08/23 17:50:00 EDT
965    Tag: blume-20010823-toplevel
966    Description:
967    
968    - some reorganization of the code that implements various kinds of
969      environments in the compiler (static, dynamic, symbolic, combined)
970    - re-implemented the EnvRef module so that evalStream works properly
971      (if the stream contains references to "use", "CM.make", etc.)
972    - cleaned up evalloop.sml and interact.sml (but they need more cleaning)
973    
974    ----------------------------------------------------------------------
975    Name: Matthias Blume
976    Date: 2001/08/20 15:50 EDT
977    Tag: blume20010820-slipup
978    Description:
979    
980    I forgot to commit a few files.  Here they are...
981    
982    ----------------------------------------------------------------------
983    Name: Matthias Blume
984    Date: 2001/08/20 15:35:00 EDT
985    Tag: blume-20010820-debugprof
986    Description:
987    
988    !!!! NEW BOOTFILES !!!!
989    
990    This is another round of reorganizing the compiler sources.  This
991    time the main goal was to factor out all the "instrumentation"
992    passes (for profiling and backtracing) into their own library.
993    The difficulty was to do it in such a way that it does not depend
994    on elaborate.cm but only on elabdata.cm.
995    
996    Therefore there have been further changes to both elaborate.cm and
997    elabdata.cm -- more "generic" things have been moved from the former
998    to the latter.  As a result, I was forced to split the assignment
999    of numbers indicating "primtyc"s into two portions: SML-generic and
1000    SML/NJ-specific.  Since it would have been awkward to maintain,
1001    I bit the bullet and actually _changed_ the mapping between these
1002    numbers and primtycs.  The bottom line of this is that you need
1003    a new set of bin- and bootfiles.
1004    
1005    I have built new bootfiles for all architectures, so doing a fresh
1006    checkout and config/install.sh should be all you need.
1007    
1008    The newly created library's name is
1009    
1010        $smlnj/viscomp/debugprof.cm
1011    
1012    and its sources live under
1013    
1014        src/compiler/DebugProf
1015    
1016    ----------------------------------------------------------------------
1017    Name: Matthias Blume
1018    Date: 2001/08/15 17:15:00 EDT
1019    Tag: blume-20010815-compreorg
1020    Description:
1021    
1022    This is a first cut at reorganizing the CM libraries that make up the
1023    core of the compiler.  The idea is to separate out pieces that could
1024    be used independently by tools, e.g., the parser, the typechecker, etc.
1025    
1026    The current status is a step in this direction, but it is not quite
1027    satisfactory yet.  Expect more changes in the future.
1028    
1029    Here is the current (new) organization...
1030    
1031        What used to be $smlnj/viscomp/core.cm is now divided into
1032        six CM libraries:
1033    
1034             $smlnj/viscomp/basics.cm
1035                           /parser.cm
1036                           /elabdata.cm
1037                           /elaborate.cm
1038                           /execute.cm
1039                           /core.cm
1040    
1041        The CM files for these libraries live under src/system/smlnj/viscomp.
1042        All these libraries are proxy libraries that contain precisely
1043        one CM library component.  Here are the locations of the components
1044        (all within the src/compiler tree):
1045    
1046             Basics/basics.cm
1047             Parse/parser.cm
1048             ElabData/elabdata.cm
1049             Elaborator/elaborate.cm
1050             Execution/execute.cm
1051             core.cm
1052    
1053         [This organization is the same that has been used already
1054         for a while for the architecture-specific parts of the visible
1055         compiler and for the old version of core.cm.]
1056    
1057         As you will notice, many source files have been moved from their
1058         respective original locations to a new home in one of the above
1059         subtrees.
1060    
1061         The division of labor between the new libraries is the following:
1062    
1063             basics.cm:
1064                - Simple, basic definitions that pertain to many (or all) of
1065                  the other libraries.
1066             parser.cm:
1067                - The SML parser, producing output of type Ast.dec.
1068                - The type family for Ast is also defined and exported here.
1069             elabdata.cm:
1070                - The datatypes that describe input and output of the elaborator.
1071                  This includes types, absyn, and static environments.
1072             elaborator.cm:
1073                - The SML/NJ type checker and elaborator.
1074                  This maps an Ast.dec (with a given static environment) to
1075                  an Absyn.dec (with a new static environment).
1076                - This libraries implements certain modules that used to be
1077                  structures as functors (to remove dependencies on FLINT).
1078             execute.cm:
1079                - Everything having to do with executing binary code objects.
1080                - Dynamic environments.
1081             core.cm:
1082                - SML/NJ-specific instantiations of the elaborator and MLRISC.
1083                - Top-level modules.
1084                - FLINT (this should eventually become its own library)
1085    
1086    Notes:
1087    
1088    I am not 100% happy with the way I separated the elaborator (and its
1089    data structures) from FLINT.  Two instances of the same problem:
1090    
1091        1. Data structures contain certain fields that carry FLINT-specific
1092           information.  I hacked around this using exn and the property list
1093           module from smlnj-lib.  But the fact that there are middle-end
1094           specific fields around at all is a bit annoying.
1095    
1096        2. The elaborator calculates certain FLINT-related information.  I tried
1097           to make this as abstract as I could using functorization, but, again,
1098           the fact that the elaborator has to perform calculations on behalf
1099           of the middle-end at all is not nice.
1100    
1101        3. Having to used exn and property lists is unfortunate because it
1102           weakens type checking.  The other alternative (parameterizing
1103           nearly *everything*) is not appealing, though.
1104    
1105    I removed the "rebinding =" warning hack because due to the new organization
1106    it was awkward to maintain it.  As a result, the compiler now issues some of
1107    these warnings when compiling init.cmi during bootstrap compilation. On
1108    the plus side, you also get a warning when you do, for example:
1109       val op = = Int32.+
1110    which was not the case up to now.
1111    
1112    I placed "assign" and "deref" into the _Core structure so that the
1113    code that deals with the "lazy" keyword can find them there.  This
1114    removes the need for having access to the primitive environment
1115    during elaboration.
1116    
1117    ----------------------------------------------------------------------
1118    Name: Matthias Blume
1119    Date: 2001/08/13
1120    Tag: blume-20010813-closures
1121    Description:
1122    
1123    This fix was sent to us by Zhong Shao.  It is supposed to improve the
1124    performance of certain loops by avoiding needless closure allocation.
1125    
1126    ----------------------------------------------------------------------
1127    Name: Lal George
1128    Date: 2001/07/31 10:03:23 EDT 2001
1129    Tag: george-20010731-x86-fmalloc
1130    Description: Fixed bug in x86 calls
1131    
1132        There was a bug where call instructions would mysteriously
1133        vanish. The call instruction had to be one that returned
1134        a floating point value.
1135    
1136    ----------------------------------------------------------------------
1137    Name: Lal George
1138    Date: 2001/07/19 16:36:29 EDT 2001
1139    Tag: george-20010719-simple-cells
1140    Description:
1141    
1142    I have dramatically simplified the interface for CELLS in MLRISC.
1143    
1144    In summary, the cells interface is broken up into three parts:
1145    
1146      1. CellsBasis : CELLS_BASIS
1147    
1148            CellsBasis is a top level structure and common for all
1149            architectures.  it contains the definitions of basic datatypes
1150            and utility  functions over these types.
1151    
1152      2. functor Cells() : CELLS
1153    
1154            Cells generates an interface for CELLS that incorporates the
1155            specific resources on the target architecture, such as the
1156            presence of special register classes, their number and size,
1157            and various useful substructures.
1158    
1159      3. <ARCH>CELLS
1160    
1161            e.g. SparcCells: SPARCCELLS
1162    
1163            <ARCH>CELLS usually contains additional bindings for special
1164            registers  on the architecture, such as:
1165    
1166                    val r0 : cell           (* register zero *)
1167                    val y : cell            (* Y register *)
1168                    val psr : cell          (* processor status register *)
1169                    ...
1170    
1171            The structure returned by applying the Cells functor is opened
1172            in this interface.
1173    
1174    The main implication of all this is that the datatypes for cells is
1175    split between CellsBasis and CELLS -- a fairly simple change for user
1176    code.
1177    
1178    In the old scheme the CELLS interface had a definitional binding of
1179    the form:
1180    
1181            signature CELLS = sig
1182    
1183               structure CellsBasis = CellsBasis
1184    
1185               ...
1186    
1187            end
1188    
1189    With all the sharing constraints that goes on in MLRISC, this old
1190    design  quickly leads to errors such as:
1191    
1192            "structure definition spec inside of sharing ... "
1193    
1194    
1195    and appears to require an unacceptable amount of sharing and where
1196    constraint hackery.
1197    
1198    I think this error message (the interaction of definitional specs and
1199    sharing) requires more explanation on our web page.
1200    
1201    ----------------------------------------------------------------------
1202    Name: Matthias Blume
1203    Date: 2001/07/19 15:00:00 EDT
1204    Tag: blume-20010719-libreorg
1205    Description:
1206    
1207    This update puts together a fairly extensive but straightforward change
1208    to the way the libraries that implement the interactive system are
1209    organized:
1210    
1211       The biggest change is the elimination of structure Compiler.  As a
1212       replacement for this structure, there is now a CM library
1213       (known as $smlnj/compiler.cm or $smlnj/compiler/current.cm)
1214       that exports all the substructures of the original structure Compiler
1215       directly.  So instead of saying Compiler.Foo.bar one now simply
1216       says Foo.bar.  (The CM libraries actually export a collection of
1217       structures that is richer than the collection of substructures of
1218       structure Compiler.)
1219    
1220       To make the transition smooth, there is a separate library called
1221       $smlnj/compiler/compiler.cm which puts together and exports the
1222       original structure Compiler (or at least something very close to it).
1223    
1224       There are five members of the original structure Compiler
1225       that are not exported directly but which instead became members
1226       of a new structure Backend (described by signature BACKEND).  These are:
1227       structure Profile (: PROFILE), structure Compile (: COMPILE), structure
1228       Interact (: INTERACT), structure Machine (: MACHINE), and val
1229       architecture (: string).
1230    
1231       Structure Compiler.Version has become structure CompilerVersion.
1232    
1233       Cross-compilers for alpha32, hppa, ppc, sparc, and x86 are provided
1234       by $smlnj/compiler/<arch>.cm where <arch> is alpha32, hppa, ppc, sparc,
1235       or x86, respectively.
1236       Each of these exports the same frontend structures that
1237       $smlnj/compiler.cm exports.  But they do not have a structure Backend
1238       and instead export some structure <Arch>Backend where <Arch> is Alpha32,
1239       Hppa, PPC, Sparc, or X86, respectively.
1240    
1241       Library $smlnj/compiler/all.cm exports the union of the exports of
1242       $smlnj/compiler/<arch>.cm
1243    
1244       There are no structures <Arch>Compiler anymore, use
1245       $smlnj/compiler/<arch>.cm instead.
1246    
1247       Library host-compiler-0.cm is gone.  Instead, the internal library
1248       that instantiates CM is now called cm0.cm.  Selection of the host
1249       compiler (backend) is no longer done here but. (Responsibility for it
1250       now lies with $smlnj/compiler/current.cm.  This seems to be more
1251       logical.)
1252    
1253       Many individual files have been moved or renamed.  Some files have
1254       been split into multiple files, and some "dead" files have been deleted.
1255    
1256    Aside from these changes to library organization, there are also changes
1257    to the way the code itself is organized:
1258    
1259       Structure Binfile has been re-implemented in such a way that it no
1260       longer needs any knowledge of the compiler.  It exclusively deals
1261       with the details of binfile layout.  It no longer invokes the
1262       compiler (for the purpose of creating new prospective binfile
1263       content), and it no longer has any knowledge of how to interpret
1264       pickles.
1265    
1266       Structure Compile (: COMPILE) has been stripped down to the bare
1267       essentials of compilation.  It no longer deals with linking/execution.
1268       The interface has been cleaned up considerably.
1269    
1270       Utility routines for dealing with linking and execution have been
1271       moved into their own substructures.
1272    
1273       (The ultimate goal of these changes is to provide a light-weight
1274       binfile loader/linker (at least for, e.g., stable libraries) that
1275       does not require CM or the compiler to be present.)
1276    
1277    CM documentation has been updated to reflect the changes to library
1278    organization.
1279    
1280    ----------------------------------------------------------------------
1281    Name: Matthias Blume
1282    Date: 2001/07/10 17:30:00 EDT
1283    Tag: Release_110_34
1284    Description:
1285    
1286    Minor tweak to 110.34 (re-tagged):
1287    
1288      - README.html file added to CVS repository
1289      - runtime compiles properly under FreeBSD 3.X and 4.X
1290    
1291    ----------------------------------------------------------------------
1292    Name: Matthias Blume
1293    Date: 2001/07/10 17:30:00 EDT
1294    Tag: Release_110_34
1295    Description:
1296    
1297    New version number (110.34). New bootfiles.
1298    
1299    ----------------------------------------------------------------------
1300    Name: Matthias Blume
1301    Date: 2001/07/09 16:00:00 EDT
1302    Tag: blume-20010709-more-varargs
1303    Description:
1304    
1305    I changed the handling of varargs in ml-nlffigen again:
1306    The ellipsis ... will now simply be ignored (with an accompanying warning).
1307    
1308    The immediate effect is that you can actually call a varargs function
1309    from ML -- but you can't actually supply any arguments beyond the ones
1310    specified explicitly.  (For example, you can call printf with its format
1311    string, but you cannot pass additional arguments.)
1312    
1313    This behavior is only marginally more useful than the one before, but
1314    it has the advantage that a function or, more importantly, a function
1315    type never gets dropped on the floor, thus avoiding follow-up problems with
1316    other types that refer to the offending one.
1317    
1318    ----------------------------------------------------------------------
1319    Name: Matthias Blume
1320    Date: 2001/07/09 11:25:00 EDT
1321    Tag: blume-20010709-varargs
1322    Description:
1323    
1324    1. ckit-lib.cm now exports structure Error
1325    2. ml-nlffigen reports occurences of "..." (i.e., varargs function types)
1326       with a warning accompanied by a source location.  Moreover, it
1327       merely skips the offending function or type and proceeds with the
1328       rest of its work.u  As a result, one can safely feed C code containing
1329       "..." to ml-nlffigen.
1330    3. There are some internal improvements to CM, providing slightly
1331       more general string substitutions in the tools subsystem.
1332    
1333    ----------------------------------------------------------------------
1334    Name: Matthias Blume
1335    Date: 2001/06/27 15:10:00 EDT
1336    Tag: blume-20010627-concur
1337    Description:
1338    
1339    Fixed a small bug in CM's handling of parallel compilation.
1340    (You could observe the bug by Control-C-interrupting an ordinary
1341    CMB.make or CM.stabilize and then attaching some compile servers.
1342    The result was that all of a sudden the previously interrupted
1343    compilation would continue on its own.  This was because of
1344    an over-optimization: CM did not bother to clean out certain queues
1345    when no servers were attached "anyway", resulting in the contents
1346    of these queues to grab control when new servers did get attached.)
1347    
1348    There is also another minor update to the CM manual.
1349    
1350    ----------------------------------------------------------------------
1351    Name: Matthias Blume
1352    Date: 2001/06/26 16:15:00 EDT
1353    Tag: blume-20010626-cmdoc
1354    Description:
1355    
1356    Minor typo fixed in CM manual (syntax diagram for libraries).
1357    
1358    ----------------------------------------------------------------------
1359    Name: Matthias Blume
1360    Date: 2001/06/25 22:55:00 EDT
1361    Tag: blume-20010625-x86pc
1362    Description:
1363    
1364    Fixed a nasty bug in the X86 assembly code that caused signal
1365    handlers to fail (crash) randomly.
1366    
1367    ----------------------------------------------------------------------
1368    Name: Matthias Blume
1369    Date: 2001/06/25 12:05:00 EDT
1370    Tag: blume-20010625-nlffigen
1371    Description:
1372    
1373    This update fixes a number of minor bugs in ml-nlffigen as reported by
1374    Nick Carter <nbc@andrew.cmu.edu>.
1375    
1376      1. Silly but ok typedefs of the form "typedef void myvoid;" are now accepted.
1377      2. Default names for generated files are now derived from the name of
1378         the C file *without its directory*.  In particular, this causes generated
1379         files to be placed locally even if the C file is in some system directory.
1380      3. Default names for generated signatures and structures are also derived
1381         from the C file name without its directory.  This avoids silly things
1382         like "structure GL/GL".
1383         (Other silly names are still possible because ml-nlffigen does not do
1384          a thorough check of whether generated names are legal ML identifiers.
1385          When in doubt, use command line arguments to force particular names.)
1386    
1387    ----------------------------------------------------------------------
1388    Name: Matthias Blume
1389    Date: 2001/06/21 12:25:00 EDT
1390    Tag: blume-20010621-eXene
1391    Description:
1392    
1393    eXene now compiles and (sort of) works again.
1394    
1395    The library name (for version > 110.33) is $/eXene.cm.
1396    
1397    I also added an new example in src/eXene/examples/nbody.  See the
1398    README file there for details.
1399    
1400    ----------------------------------------------------------------------
1401    Name: Matthias Blume
1402    Date: 2001/06/20 16:40:00 EDT
1403    Tag: blume-20010620-cml
1404    Description:
1405    
1406    CML now compiles and works again.
1407    
1408    Libraries (for version > 110.33):
1409    
1410      $cml/cml.cm            Main CML library.
1411      $cml/basis.cm          CML's version of $/basis.cm.
1412      $cml/cml-internal.cm   Internal helper library.
1413      $cml/core-cml.cm       Internal helper library.
1414      $cml-lib/trace-cml.cm  Tracing facility.
1415      $cml-lib/smlnj-lib.cm  CML's version of $/smlnj-lib.cm
1416    
1417    The installer (config/install.sh) has been taught how to properly
1418    install this stuff.
1419    
1420    ----------------------------------------------------------------------
1421    Name: Matthias Blume
1422    Date: 2001/06/19 17:55:00 EDT
1423    Tag: blume-20010619-instantiate
1424    Description:
1425    
1426    This un-breaks the fix for bug 1432.
1427    (The bug was originally fixed in 110.9 but I broke it again some
1428    time after that.)
1429    
1430    ----------------------------------------------------------------------
1431    Name: Matthias Blume
1432    Date: 2001/06/19 17:25:00 EDT
1433    Tag: blume-20010619-signals
1434    Description:
1435    
1436    This should (hopefully) fix the long-standing signal handling bug.
1437    (The runtime system was constructing a continuation record with an
1438    incorrect descriptor which would cause the GC to drop data on the floor...)
1439    
1440    ----------------------------------------------------------------------
1441    Name: Matthias Blume
1442    Date: 2001/06/15 15:05:00 EDT
1443    Tag: blume-20010615-moresparc
1444    Description:
1445    
1446    Here is a short late-hour update related to Sparc c-calls:
1447    
1448     -- made handling of double-word arguments a bit smarter
1449    
1450     -- instruction selection phase tries to collapse certain clumsily
1451        constructed ML-Trees; typical example:
1452    
1453            ADD(ty,ADD(_,e,LI d1),LI d2)  ->  ADD(ty,e,LI(d1+d2))
1454    
1455        This currently has no further impact on SML/NJ since mlriscGen does
1456        not seem to generate such patterns in the first place, and c-calls
1457        (which did generate them in the beginning) has meanwhile been fixed
1458        so as to avoid them as well.
1459    
1460    ----------------------------------------------------------------------
1461    Name: Matthias Blume
1462    Date: 2001/06/15 15:05:00 EDT
1463    Tag: blume-20010615-sparc
1464    Description:
1465    
1466    The purpose of this update is to provide an implementation of NLFFI
1467    on Sparc machines.
1468    
1469    Here are the changes in detail:
1470    
1471       * src/MLRISC/sparc/c-calls/sparc-c-calls.sml is a new file containing
1472       the Sparc implementation of the c-calls API.
1473       * The Sparc backend of SML/NJ has been modified to uniformely use %fp
1474       for accessing the ML frame.  Thus, we have a real frame pointer and
1475       can freely modify %sp without need for an omit-frame-ptr phase.
1476       The vfp logic in src/compiler/CodeGen/* has been changed to accomodate
1477       this case.
1478       * ml-nlffigen has been taught to produce code for different architectures
1479       and calling conventions.
1480       * In a way similar to what was done in the x86 case, the Sparc
1481       backend uses its own specific extension to mltree.  (For example,
1482       it needs to be able to generate UNIMP instructions which are part
1483       of the calling convention.)
1484       * ml-nlffi-lib was reorganized to make it more modular (in particular,
1485       to make it easier to plug in new machine- and os-dependent parts).
1486    
1487    There are some other fairly unrelated bug fixes and cleanups as well:
1488    
1489       * I further hacked the .cm files for MLRISC tools (like MDLGen) so
1490       that they properly share their libraries with existing SML/NJ libraries.
1491       * I fixed a minor cosmetic bug in CM, supressing certain spurious
1492       follow-up error messages.
1493       * Updates to CM/CMB documentation.
1494    
1495    TODO items:
1496    
1497       * MLRISC should use a different register as its asmTemp on the Sparc.
1498         (The current %o2 is a really bad choice because it is part of the
1499         calling conventions, so things might interfere in unexpected ways.)
1500    
1501    ----------------------------------------------------------------------
1502    Name: Matthias Blume
1503    Date: 2001/06/07
1504    Tag: blume-20010607-calls
1505    Description:
1506    
1507    A number of internal changes related to C calls and calling conventions:
1508    
1509    1. ML-Tree CALL statements now carry a "pops" field.  It indicates the
1510       number of bytes popped implicitly (by the callee).  In most cases
1511       this field is 0 but on x86/win32 it is some non-zero value.  This
1512       is information provided for the benefit of the "omit-frameptr" pass.
1513    2. The CALL instruction on the x86 carries a similar "pops" field.
1514       The instruction selection phase copies its value from the ML-Tree
1515       CALL statement.
1516    3. On all other architectures, the instruction selection phase checks
1517       whether "pops=0" and complains if not.
1518    4. The c-calls implementation for x86 now accepts two calling conventions:
1519       "ccall" and "stdcall".  When "ccall" is selected, the caller cleans
1520       up after the call and pops is set to 0.  For "stdcall", the caller
1521       does nothing, leaving the cleanup to the callee; pops is set to
1522       the number of bytes that were pushed onto the stack.
1523    5. The cproto decoder (compiler/Semant/types/cproto.sml) now can
1524       distinguish between "ccall" and "stdcall".
1525    6. The UNIMP instruction has been added to the supported Sparc instruction
1526       set. (This is needed for implementing the official C calling convention
1527       on this architecture.)
1528    7. I fixed some of the .cm files under src/MLRISC/Tools to make them
1529       work with the latest CM.
1530    
1531    ----------------------------------------------------------------------
1532    Name: Matthias Blume
1533    Date: 2001/06/05 15:10:00 EDT
1534    Tag: blume-20010605-cm-index
1535    Description:
1536    
1537    0. The "lambdasplit" parameter for class "sml" in CM has been documented.
1538    
1539    1. CM can now generate "index files".  These are human-readable files
1540       that list on a per-.cm-file basis each toplevel symbol defined or
1541       imported.  The location of the index file for
1542       <p>/<d>.cm is <p>/CM/INDEX/<d>.cm.
1543       To enable index-file generation, set CM.Control.generate_index to true
1544       or export an environment-symbol: export CM_GENERATE_INDEX=true.
1545    
1546       The CM manual has been updated accordingly.
1547    
1548    2. I made some slight modifications to the c-calls API in MLRISC.
1549    
1550         a) There is now a callback to support saving/restoring of
1551            dedicated but caller-save registers around the actual call
1552            instruction.
1553         b) One can optionally specify a comment-annotation for the
1554            call instruction.
1555    
1556    3. SML/NJ (mlriscGen.sml) uses this new API for the rawccall primop.
1557       (For example, the comment annotation shows the C prototype of
1558        the function being called.)
1559    
1560    ----------------------------------------------------------------------
1561    Name: Matthias Blume
1562    Date: 2001/06/01 13:30:00 EDT
1563    Tag: blume-20010601-nlffi-cleanup
1564    Description:
1565    
1566    This is mostly a cleanup of MLFFI stuff:
1567    
1568       - some signature files have been put into a more exposed place
1569       - the ugly 'f type parameter is gone (simplifies types tremendously!)
1570       - ml-nlffigen changed accordingly
1571       - tutorial updated
1572    
1573    Other changes:
1574    
1575       - author's affiliation in CM manual(s) updated
1576       - some more recognized keywords added to Allen's sml.sty
1577    
1578    ----------------------------------------------------------------------
1579    Name: Matthias Blume
1580    Date: 2001/05/25 15:30:00 EDT
1581    Tag: blume-20010525-iptr
1582    Description:
1583    
1584      - put the official 110.33-README (as it appears on the ftp server) under
1585        CVS
1586      - fixed a small bug related to incomplete pointer types in
1587        ml-nlffigen
1588      - small cosmetic change to the ml-nlffi-lib's "arr" type constructor
1589        (it does not need the 'f type parameter)
1590    
1591    ----------------------------------------------------------------------
1592    Name: Matthias Blume
1593    Date: 2001/05/23 14:30:00 EDT
1594    Tag: Release_110_33
1595    Description:
1596    
1597    New version number (110.33).  New bootfiles.
1598    
1599    ----------------------------------------------------------------------
1600    Name: Matthias Blume
1601    Date: 2001/05/22 18:06:00 EDT
1602    Tag: blume-20010522-targets
1603    Description:
1604    
1605    Made install.sh use file config/targets.customized if it exists, falling
1606    back to config/targets if it doesn't.  This way one can have a customized
1607    version of the targets file without touching the "real thing", thus
1608    eliminating the constant fear of accidentally checking something bogus
1609    back into the CVS repository...  (File config/targets.customized must
1610    not be added to the repository!)
1611    
1612    ----------------------------------------------------------------------
1613    Name: Matthias Blume
1614    Date: 2001/05/22 16:30:00 EDT
1615    Tag: blume-20010522-minitut
1616    Description:
1617    
1618    1. Bug fix in ml-nlffigen; now (hopefully) correctly handling
1619       struct returns.
1620    2. Added src/ml-nlffi-lib/Doc/mini-tutorial.txt.  This is some very
1621       incomplete, preliminary documentation for NLFFI.
1622    
1623    ----------------------------------------------------------------------
1624    Name: Matthias Blume
1625    Date: 2001/05/14 11:30:00 EDT
1626    Tag: blume-20010514-script
1627    Description:
1628    
1629    Some bugs in install script fixed.
1630    
1631    In addition to that I also made a slight change to the NLFFI API:
1632    Functors generated by ml-nlffigen now take the dynamic library as a
1633    straight functor argument, not as a suspended one.  (The original
1634    functor code used to force the suspension right away anyway, so there
1635    was nothing gained by this complication of the interface.)
1636    
1637    ----------------------------------------------------------------------
1638    Name: Matthias Blume
1639    Date: 2001/05/11 14:35:00 EDT
1640    Tag: blume-20010511-ml-nlffi
1641    Description:
1642    
1643    I finally took the plunge and added my new FFI code to the main
1644    repository.  For x86-linux it is now ready for prime-time.
1645    
1646    There are two new subdirectories of "src":
1647    
1648      - ml-nlffi-lib:
1649           The utility library for programs using the FFI interface.
1650           Here is the implementation of $/c.cm and its associated low-level
1651           partners $/c-int.cm and $/memory.cm.
1652      - ml-nlffigen:
1653           A stand-alone program for generating ML glue code from C source
1654           code.
1655    
1656    Building ml-nlffigen requires $/ckit-lib.cm.
1657    
1658    The config/install.sh script has been updates to do the Right Thing
1659    (hopefully).
1660    
1661    Notice that the source tree for the C-Kit will not be put under "src"
1662    but directly under the installation root directory.  (This is the
1663    structure that currently exists on the CVS server when you check out
1664    module "sml".)  Fortunately, config/install.sh knows about this oddity.
1665    
1666    Bugs: No documentation yet.
1667    
1668    ----------------------------------------------------------------------
1669    Name: Matthias Blume
1670    Date: 2001/05/09 16:35:00 EDT
1671    Tag: blume-20010509-cpscontract
1672    Description:
1673    
1674    Fixed a bug in the accounting code in cpsopt/contract.sml.  (The
1675    wrapper/unwrapper elimination did not decrement usage counts and some
1676    dead variables got overlooked by the dead-up logic.)
1677    
1678    ----------------------------------------------------------------------
1679    Name: Lal George
1680    Date: 2001/05/08  17:26:09 EDT
1681    Tag: george-20010508-omit-frameptr
1682    Description:
1683    
1684    Changes to implement the omit-frame-pointer optimization to support
1685    raw C calls. For now, there is only support on the Intel x86, but
1686    other architectures will follow as more experience is gained with this.
1687    
1688    
1689    ----------------------------------------------------------------------
1690    Name: Matthias Blume
1691    Date: 2001/05/07 14:40:00 EDT
1692    Tag: blume-20010507-proxies
1693    Description:
1694    
1695    I made into "proxy libraries" all libraries that qualify for such a
1696    change.  (A qualifying library is a library that has another library or
1697    groups as its sole member and repeats that member's export list
1698    verbatim.  A proxy library avoids this repetition by omitting its export
1699    list, effectively inheriting the list that its (only) member exports.
1700    See the CM manual for more explanation.)
1701    The main effect is that explicit export lists for these libraries
1702    do not have to be kepts in sync, making maintenance a bit easier.
1703    
1704    I also added copyright notices to many .cm-files.
1705    
1706    Last but not least, I made a new set of bootfiles.
1707    
1708    ----------------------------------------------------------------------
1709    Name: Matthias Blume
1710    Date: 2001/05/04 17:00:00 EDT
1711    Tag: blume-20010504-cm-lsplit
1712    Description:
1713    
1714    0. John merged pending changes to $/smlnj-lib.cm
1715    
1716    1. Allen's previous change accidentally backed out of one of Lal's
1717       earlier changes.  I undid this mistake (re-introducing Lal's change).
1718    
1719    2. I used the new topOrder' function from graph-scc.sml (from $/smlnj-lib.cm)
1720       within the compiler where applicable.  There is some code simplification
1721       because of that.
1722    
1723    3. The "split" phase (in FLINT) is now part of the default list of phases.
1724       Compiler.Control.LambdaSplitting.* can be used to globally control the
1725       lambda-splitting (cross-module-inlining) engine.  In addition to that,
1726       it can now also be controlled on a per-source basis: CM has been taught
1727       a new tool parameter applicable to ML source files.
1728    
1729       - To turn lambda-splitting off completely:
1730            local open Compiler.Control.LambdaSplitting in
1731                val _ = set Off
1732            end
1733       - To make "no lambda-splitting" the global default (but allow per-source
1734         overriding); this is the initial setting:
1735            local open Compiler.Control.LambdaSplitting in
1736                val _ = set (Default NONE)
1737            end
1738       - To make "lambda-splitting with aggressiveness a" the global default
1739         (and allow per-source overriding):
1740            local open Compiler.Control.LambdaSplitting in
1741                val _ = set (Default (SOME a))
1742            end
1743    
1744       - To turn lambda-splitting off for a given ML souce file (say: a.sml)
1745         write (in the respective .cm-file):
1746            a.sml (lambdasplitting:off)
1747       - To turn lambda-splitting for a.sml on with minimal aggressiveness:
1748            a.sml (lambdasplitting:on)
1749       - To turn lambda-splitting for a.sml on with aggressiveness <a> (where
1750         <a> is a decimal non-negative integer):
1751            a.sml (lambdasplitting:<a>)
1752       - To turn lambda-splitting for a.sml on with maximal aggressiveness:
1753            a.sml (lambdasplitting:infinity)
1754       - To use the global default for a.sml:
1755            a.sml (lambdasplitting:default)
1756         or simply
1757            a.sml
1758    
1759    ----------------------------------------------------------------------
1760    Name: Allen Leung
1761    Date: 2001/05/04 01:57:00 EDT
1762    Tag: leunga-20010504-sync
1763    Description:
1764    
1765      MLRISC features.
1766    
1767      1. Fix to CMPXCHG instructions.
1768      2. Changed RA interface to allow annotations in callbacks.
1769      3. Added a new method to the stream interface to allow annotations updates.
1770    
1771    ----------------------------------------------------------------------
1772    Name: Matthias Blume
1773    Date: 2001/05/01 11:45:00 EDT
1774    Tag: blume-20010501-pcedittmp
1775    Description:
1776    
1777    Changed install.sh to use the current working directory instead of
1778    /usr/tmp for a temporary file (pcedittmp).  The previous choice
1779    of /usr/tmp caused trouble with MacOS X because of file premission
1780    problems.
1781    
1782    ----------------------------------------------------------------------
1783    Name: Matthias Blume
1784    Date: 2001/04/20 11:10:00 EDT
1785    Tag: blume-20010420-inMLflag
1786    Description:
1787    
1788     - added vp_limitPtrMask to vproc-state.h
1789       (for use by the raw-C-calls mechanism to implement proper interrupt
1790        handling)
1791     - made the ML compiler aware of various data-structure offsets so it
1792       can generate code for accessing the vp_inML flag and vp_limitPtrMask
1793     - tweaked mlriscGen.sml to have it emit interrupt-handling code for
1794       raw C-calls
1795    
1796    ----------------------------------------------------------------------
1797    Name: Lal George
1798    Date: 2001/04/20 09:15:28 EDT
1799    Tag: george-20010420-macosX
1800    Description:
1801    
1802     - Changes to port to Mac OS X; Darwin.
1803    
1804     - In the process I found that sqrt was broken on the PPC, because the
1805       fsqrt instruction is not implemented.
1806    
1807    ----------------------------------------------------------------------
1808    Name: Matthias Blume
1809    Date: 2001/04/18 12:45:00 EDT
1810    Tag: blume-20010418-ccalls
1811    Description:
1812    
1813     - fixed two off-by-4 errors in the x86-specific c-calls implementation
1814       (this bug prevented structure arguments containing pointers from being
1815        passed correctly)
1816     - changed the raw-C-call code in mlriscGen.sml in such a way that
1817       structure arguments are represented as a pointer to the beginning
1818       of the structure (instead of having a series of synthesized arguments,
1819       one for each structure member)
1820    
1821     - made makeml script's verbosity level configurable via environment
1822       variable (MAKEML_VERBOSITY)
1823    
1824     - eliminated placeholder implementations for f32l, w16s, i16s, and f32s
1825       in rawmem-x86.sml; we are now using the real thing
1826    
1827    ----------------------------------------------------------------------
1828    Name: Matthias Blume
1829    Date: 2001/03/22 16:25:00 EST
1830    Tag: blume-20010322-bootfiles
1831    Description:
1832    
1833    Created a new set of bootfiles (for your automatic installation convenience).
1834    
1835    ----------------------------------------------------------------------
1836    Name: Matthias Blume
1837    Date: 2001/03/22 15:10:00 EST
1838    Tag: blume-20010322-rawmem-parcm
1839    Description:
1840    
1841    1. All "raw memory access" primitives for the new FFI are implemented now
1842       (at least on the x86).
1843    2. Some further cleanup of CM's parallel make mechanism.
1844    
1845    ----------------------------------------------------------------------
1846    Name: Matthias Blume
1847    Date: 2001/03/19 17:53:00 EST
1848    Tag: blume-20010319-parallel
1849    Description:
1850    
1851    Parallel make (using compile servers) now works again.
1852    
1853    To this end, CM.stabilize and CMB.make have been modified to work in
1854    two passes when compile servers are attached:
1855       1. Compile everything, do not perform stabilization; this pass
1856          uses compile servers
1857       2. Stabilize everything; this pass does not use compile servers
1858    If there are no compile servers, the two passes are combined into one
1859    (as before).  Splitting the passes increases the inherent parallelism
1860    in the dependency graph because the entire graph including all
1861    libraries is available at the same time.  This, in turn, improves
1862    server utilization.  The downside is that the master process will
1863    have to do some extra work after compilation is done (because for
1864    technical reasons it must re-read all the binfiles during stabilization).
1865    
1866    ----------------------------------------------------------------------
1867    Name: Matthias Blume
1868    Date: 2001/03/16 12:22:00 EST
1869    Tag: blume-20010316-bootfiles
1870    Description:
1871    
1872    Created a new set of bootfiles (for your automatic installation convenience).
1873    
1874    ----------------------------------------------------------------------
1875    Name: Matthias Blume
1876    Date: 2001/03/16 11:00:00 EST
1877    Tag: blume-20010316-MLTREE-fixup
1878    Description:
1879    
1880    This is a minor fixup for an (untagged) earlier commit by Allen.
1881    (A file was missing).
1882    
1883    ----------------------------------------------------------------------
1884    Name: Allen Leung
1885    Date: Mon Mar  5 18:54:57 EST 2001
1886    Tag: leunga-20010305-cut-support
1887    
1888    1. New support for alternative control-flow in MLTREE.
1889       Currently we support
1890    
1891          FLOW_TO(CALL ...., [k1,...,kn])
1892    
1893       This is needed for 'cuts to' in C-- and try/handle-like constructs
1894       in Moby
1895    
1896       New assembler flag "asm-show-cutsto" to turn on control-flow debugging.
1897    
1898    2. Register Allocator
1899    
1900       Changes in interface [from Fermin, John]
1901    
1902    3. Alpha 8-bit SLL support [Fermin]
1903    
1904    4. All architectures
1905    
1906       A new module (ClusterExpandCopies) for expanding parallel copies.
1907    
1908    ----------------------------------------------------------------------
1909    Name: Allen Leung
1910    Date: 2001/02/27 23:07:00 EST
1911    Tag: leunga-20010227-minor-stuff
1912    
1913    1. Alpha bug fix for CMOVNE
1914    2. Handle mltree COND(..,FCMP ...,...)
1915    3. Bug fix in simplifier
1916    
1917    ----------------------------------------------------------------------
1918    Name: Matthias Blume
1919    Date: 2001/01/30 17:50:00 EST
1920    Tag: blume-20010130-sync
1921    Description:
1922    
1923    This is just a minor update to sync my devel branch with the main brach.
1924    The only visible change is the addition of some README files.
1925    
1926    ----------------------------------------------------------------------
1927    Name: Matthias Blume
1928    Date: 2001/01/12 23:30:00 JST
1929    Tag: blume-20010112-bootfiles
1930    Description:
1931    
1932    Made a new set of bootfiles that goes with the current state of the
1933    repository.
1934    
1935    ----------------------------------------------------------------------
1936    Name: Matthias Blume
1937    Date: 2001/01/12 21:20:00 JST
1938    Tag: blume-20010112-sync
1939    Description:
1940    
1941    I am just flushing out some minor changes that had accumulated in
1942    my private branch in order to sync with the main tree.  (This is
1943    mainly because I had CVS trouble when trying to merge _into_ my
1944    private branch.)
1945    
1946    Most people should be completely unaffected by this.
1947    
1948    ----------------------------------------------------------------------
1949    Name: Allen Leung
1950    Date: Thu Jan 11 21:03:00 EST 2001
1951    Tag: leunga-20010111-labexp=mltree
1952    Description:
1953    
1954    1.  Removed the type LabelExp and replace it by MLTree.
1955    2.  Rewritten mltree-simplify with the pattern matcher tool.
1956    3.  There were some bugs in alpha code generator which would break
1957        64-bit code generation.
1958    4.  Redo the tools to generate code with the
1959    5.  The CM files in MLRISC (and in src/system/smlnj/MLRISC)
1960        are now generated by perl scripts.
1961    
1962    ----------------------------------------------------------------------
1963    Name: Matthias Blume
1964    Date: 2001/01/10 21:55:00 JST
1965    Tag: blume-20010110-rcc
1966    Description:
1967    
1968    The RCC stuff now seems to work (but only on the x86).
1969    This required hacking of the c-calls interface (and -implementation) in
1970    MLRISC.
1971    
1972    Normal compiler users should be unaffected.
1973    
1974    ----------------------------------------------------------------------
1975    Name: Matthias Blume
1976    Date: 2001/01/09 01:20:00 JST
1977    Tag: blume-20010109-rcc
1978    Description:
1979    
1980    This is a fairly big patch, flushing out a large number of pending
1981    changes that I made to my development copy over the last couple of days.
1982    
1983    Of practical relevance at this moment is a workaround for a pickling
1984    bug that Allen ran into the other day.  The cause of the bug itself is
1985    still unknown and it might be hard to fix it properly, but the
1986    workaround has some merits of its own (namely somewhat reducing pickling
1987    overhead for certain libraries).  Therefore, I think this solution should
1988    be satisfactory at this time.
1989    
1990    The rest of the changes (i.e., the vast majority) has to do with my
1991    ongoing efforts of providing direct support for C function calls from
1992    ML.  At the moment there is a new primop "RAW_CCALL", typing magic
1993    in types/cproto.sml (invoked from FLINT/trans/translate.sml), a new
1994    case in the FLINT CPS datatype (RCC), changes to cps/convert.sml to
1995    translate uses of RAW_CCALL into RCC, and changes to mlriscGen.sml to
1996    handle RCC.
1997    
1998    The last part (the changes to mlriscGen.sml) are still known to be
1999    wrong on the x86 and not implemented on all other architectures.  But
2000    the infrastructure is in place. I had to change a few functor
2001    signatures in the backend to be able to route the CCalls interface
2002    from MLRISC there, and I had to specialize the mltree type (on the
2003    x86) to include the necessary extensions. (The extensions themselves
2004    were already there and redy to go in MLRISC/x86).
2005    
2006    Everything should be very happy as soon as someone helps me with
2007    mlriscGen.sml...
2008    
2009    In any case, nothing of this should matter to anyone as long as the
2010    new primop is not being used (which is going to be the case unless you
2011    find it where I hid it :). The rest of the compiler is completely
2012    unaffected.
2013    
2014    ----------------------------------------------------------------------
2015    Name: Matthias Blume
2016    Date: 2001/01/05 00:30:00 JST
2017    Tag: blume-20010105-primops
2018    Description:
2019    
2020    Added some experimental support for work that I am doing right now.
2021    These changes mostly concern added primops, but there is also a new
2022    experimental C library in the runtime system (but currently not enabled
2023    anywhere except on Linux/X86).
2024    
2025    In the course of adding primops (and playing with them), I discovered that
2026    Zhong's INL_PRIM hack (no type info for certain primops) was, in fact, badly
2027    broken.  (Zhong was very right he labeled this stuff as "major gross hack".)
2028    To recover, I made type information in INL_PRIM mandatory and changed
2029    prim.sml as well as built-in.sml accordingly.  The InLine structure now
2030    has complete, correct type information (i.e., no bottom types).
2031    
2032    Since all these changes mean that we need new binfiles, I also bumped the
2033    version number to 110.32.1.
2034    
2035    ----------------------------------------------------------------------
2036    Name: Matthias Blume
2037    Date: 2000/12/30 22:10:00 JST
2038    Tag: blume-20001230-various
2039    Description:
2040    
2041    Added proxy libraries for MLRISC and let MLRISC libraries refer
2042    to each other using path anchors.  (See CM manual for explanation.)
2043    
2044    Updated CM documentation.
2045    
2046    Fixed some bugs in CM.
2047    
2048    Implemented "proxy" libraries (= syntactic sugar for CM).
2049    
2050    Added "-quiet" option to makeml and changed runtime system accordingly.
2051    
2052    Added cleanup handler for exportML to reset timers and compiler stats.
2053    
2054    ----------------------------------------------------------------------
2055    Name: Lal George
2056    Date: 2000/12/22 22:22:58 EST 2000
2057    Tag: Release_110_32
2058    Description:
2059    
2060            Infinite precision used throughout MLRISC.
2061            see MLRISC/mltree/machine-int.sig
2062    
2063    ----------------------------------------------------------------------
2064    Name: Matthias Blume
2065    Date: 2000/12/22 23:16:00 JST
2066    Tag: blume-20001222-warn
2067    Description:
2068    
2069    Corrected wording and formatting of some CM warning message which I
2070    broke in my previous patch.
2071    
2072    ----------------------------------------------------------------------
2073    Name: Matthias Blume
2074    Date: 2000/12/22 21:20:00 JST
2075    Tag: blume-20001222-anchorenv
2076    Description:
2077    
2078    Fixed CM's handling of anchor environments in connection with CMB.make.
2079    
2080    ----------------------------------------------------------------------
2081    Name: Matthias Blume
2082    Date: 2000/12/22 13:15:00 JST
2083    Tag: blume-20001222-cleanup
2084    Description:
2085    
2086    Removed src/cm/ffi which does not (and did not) belong here.
2087    
2088    ----------------------------------------------------------------------
2089    Name: Matthias Blume
2090    Date: 2000/12/21 23:55:00 JST
2091    Tag: blume-20001221-exn
2092    Description:
2093    
2094    Probably most important: CM no longer silently swallows all exceptions
2095    in the compiler.
2096    Plus: some other minor CM changes.  For example, CM now reports some
2097    sizes for generated binfiles (code, data, envpickle, lambdapickle).
2098    
2099    ----------------------------------------------------------------------
2100    Name: Matthias Blume
2101    Date: 2000/12/15 00:01:05 JST
2102    Tag: blume-20001215-dirtool
2103    Description:
2104    
2105    - "dir" tool added.
2106    - improvements and cleanup to Tools structure
2107    - documentation updates
2108    
2109    ----------------------------------------------------------------------
2110    Name: Allen Leung
2111    Date: Thu Dec 14 03:45:24 EST 2000
2112    Description:
2113    Tag:  leunga-20001214-int-inf
2114    Description:
2115    
2116       In IntInf, added these standard functions, which are missing from our
2117    implementation:
2118    
2119        andb : int * int -> int
2120        xorb : int * int -> int
2121        orb  : int * int -> int
2122        notb : int -> int
2123         <<   : int * word -> int
2124        ~>>  : int * word -> int
2125    
2126       Not tested, I hope they are correct.
2127    
2128    ----------------------------------------------------------------------
2129    Name: Allen Leung
2130    Date: Fri Dec  8 19:23:26 EST 2000
2131    Description:
2132    Tag:  leunga-20001208-nowhere
2133    Description:
2134    
2135      Slight improvements to the 'nowhere' tool to handle OR-patterns,
2136    to generate better error messages etc.  Plus a brief manual.
2137    
2138    ----------------------------------------------------------------------
2139    Name: Lal George
2140    Date: 2000/12/08 09:54:02 EST 2000
2141    Tag: Release_110_31
2142    Description:
2143    
2144    - Version 110.31
2145    ----------------------------------------------------------------------
2146    Name: Allen Leung
2147    Date: Thu Dec  7 22:01:04 EST 2000
2148    Tag:  leunga-20001207-cell-monster-hack
2149    Description:
2150    
2151    Major MLRISC internal changes.  Affect all clients.
2152    Summary:
2153    
2154    1.  Type CELLS.cell = int is now replaced by a datatype.
2155        As a result, the old regmap is now gone.  Almost all interfaces
2156        in MLRISC change as a consequence.
2157    
2158    2.  A new brand version of machine description tool (v3.0) that generates
2159        modules expecting the new interface.  The old version is removed.
2160    
2161    3.  The RA interface has been further abstracted into two new functors.
2162        RISC_RA and X86RA.  These functors have much simpler interfaces.
2163        [See also directory MLRISC/demo.]
2164    
2165    4.  Some other new source->source code generation tools are available:
2166    
2167        a. MLRISC/Tools/RewriteGen -- generate rewriters from rules.
2168        b. MLRISC/Tools/WhereGen -- expands conditional pattern matching rules.
2169           I use this tool to generate the peephole optimizers---with the new
2170           cell type changes, peephole rules are becoming difficult to write
2171           without conditional pattern matching.
2172    
2173    5.  More Intmap -> IntHashTable change.  Previous changes by Matthias didn't
2174        cover the entire MLRISC source tree so many things broke.
2175    
2176    6.  CM files have been moved to the subdirectory MLRISC/cm.
2177        They are moved because there are a lot of them and they clutter up the
2178        root dir.
2179    
2180    7.  More detailed documentation to come...
2181    
2182        NOTE: To rebuild from 110.30 (ftp distribution), you'll have to do
2183        a makeml -rebuild first.  This is because of other other
2184        changes that Matthias has made (see below).
2185    
2186    
2187    ----------------------------------------------------------------------
2188    Name: Matthias Blume
2189    Date: 2000/11/30 23:12:00 JST
2190    Tag: blume-20001130-filereorg
2191    Description:
2192    
2193    Some manual updates and some file reorganizations in CM.
2194    
2195    ----------------------------------------------------------------------
2196    Name: Matthias Blume
2197    Date: 2000/11/24 17:45:00 JST
2198    Tag: blume-20001124-link
2199    Description:
2200    
2201    Drastically improved link traversal code for the case that the dynamic
2202    value was already loaded at bootstrap time.  As a result, CM and CMB
2203    now both load blazingly fast -- even on a very slow machine.  Also,
2204    memory consumption has been further reduced by this.
2205    
2206    Warning: The format of the PIDMAP file has changed.  THerefore, to
2207    bootstrap you have to do this:
2208    
2209    1. Run CMB.make
2210    2. Make a symbolic link for the boot directory:
2211         ln -s sml.boot.ARCH-OS xxx
2212    3. "Rebuild" the boot directory:
2213         ./makeml -boot xxx -rebuild sml ; rm xxx
2214    4. Boot normally:
2215          ./makeml
2216    
2217    ----------------------------------------------------------------------
2218    Name: Matthias Blume
2219    Date: 2000/11/21 21:20:00 JST
2220    Tag: blume-20001121-tools
2221    Description:
2222    
2223    Continued hacking on autoloading problem -- with success this time.
2224    Also changed tool-plugin mechanism.  See new CM manual.
2225    
2226    ----------------------------------------------------------------------
2227    Name: Matthias Blume
2228    Date: 2000/11/19 14:30:00 JST
2229    Tag:  blume-20001119-autoload
2230    Description:
2231    
2232    Some hacking to make autoloading faster.  Success for CMB, no success
2233    so far for CM.  There is a reduced structure CM' that autoloads faster.
2234    (This is a temporary, non-documented hack to be eliminated again when
2235    the general problem is solved.)
2236    
2237    ----------------------------------------------------------------------
2238    Name: Matthias Blume
2239    Date: 2000/11/17 14:10:00 JST
2240    Tag: blume-20001117-pickle-lib
2241    Description:
2242    
2243    1. Eliminated comp-lib.cm
2244    2. Made pickle-lib.cm
2245    3. Eliminated all uses of intset.sml (from comp-lib.cm)
2246    4. Replaced all uses of intmap.{sig,sml} (from comp-lib.cm) with
2247       equivalent constructs from smlnj-lib.cm (INtHashTable).
2248    5. Point 4. also goes for those uses of intmap.* in MLRISC.
2249       Duplicated intmap modules thrown out.
2250    6. Hunted down all duplicated SCC code and replaced it with
2251       equivalent stuff (GraphSCCFn from smlnj-lib.cm).
2252    7. Rewrote Feedback module.
2253    8. Moved sortedlist.sml into viscomp-lib.cm.  Eventually it
2254       should be thrown out and equivalent modules from smlnj-lib.cm
2255       should be used (IntRedBlackSet, IntListSet, ...).
2256    
2257    Confirmed that compiler compiles to fixpoint.
2258    
2259    ----------------------------------------------------------------------
2260    Name: Allen Leung
2261    Date: 2000/11/10 18:00:00
2262    Tag: leunga-20001110-new-x86-fp
2263    
2264    A new x86 floating point code generator has been added.
2265    By default this is turned off.  To turn this on, do:
2266    
2267        CM.autoload "$smlnj/compiler.cm";
2268        Compiler.Control.MLRISC.getFlag "x86-fast-fp" := true;
2269    
2270    Changes:
2271    
2272    1.  Changed FTAN to FPTAN so that the assembly output is correct.
2273    2.  Changed the extension callback for FTANGENT to generate:
2274    
2275              fptan
2276              fstp  %st(0)
2277        instead of
2278              fptan
2279              fstpl ftempmem
2280    
2281    3.  Numerous assembly fixes for x86.
2282    
2283    5.  Cleaned up the machine code output module x86/x86MC.sml and added
2284        support for a whole bunch of instructions and addressing modes:
2285    
2286          fadd/fsub/fsubr/fmul/fdiv/fdivr  %st, %st(n)
2287          faddp/fsubp/fsubrp/fmulp/fdivp/fdivrp  %st, %st(n)
2288          fadd/fsub/fsubr/fmul/fdiv/fdivr  %st(n), %st
2289          fiadd/fisub/fisubr/fimul/fidiv/fidivr mem
2290          fxch %st(n)
2291          fld %st(n)
2292          fst %st(n)
2293          fst mem
2294          fstp %st(n)
2295          fucom %st(n)
2296          fucomp %st(n)
2297    
2298        All these are now generated when the fast fp mode is turned on.
2299    
2300    6.  Removed the dedicated registers %st(0), ..., %st(7) from X86CpsRegs
2301    
2302    ----------------------------------------------------------------------
2303    Name: Matthias Blume
2304    Date: 2000/11/09 11:20:00 JST
2305    Tag: blume-20001109-scc
2306    Description:
2307    
2308    Eliminated some code duplication:
2309    
2310    1. Added "where" clause to GraphSCCFn in SML/NJ Library.
2311       (Otherwise the functor is useless.)
2312    2. Used GraphSCCFn where SCCUtilFun was used previously.
2313    3. Got rid of SCCUtilFun (in comp-lib.cm).
2314    
2315    ----------------------------------------------------------------------
2316    Name: Lal George
2317    Date: 2000/11/06 09:02:21 EST 2000
2318    Tag: Release_110_30
2319    Description:
2320    
2321    - Version 110.30
2322    ----------------------------------------------------------------------
2323    Name: Matthias Blume
2324    Date: 2000/11/04 14:45:00
2325    Tag: blume-20001104-mlbuild
2326    Description:
2327    
2328    - Made ml-build faster on startup.
2329    - Documentation fixes.
2330    
2331    ----------------------------------------------------------------------
2332    Name: Matthias Blume
2333    Date: 2000/11/02 17:00:00 JST
2334    Tag: blume-20001102-condcomp
2335    Description:
2336    
2337    - Small tweaks to pickler -- new BOOTFILES!
2338    - Version bumped to 110.29.2.
2339    - Added conditional compilation facility to init.cmi (see comment there).
2340    ----------------------------------------------------------------------
2341    Name: Allen Leung
2342    Date: 2000/10/23 19:31:00
2343    Tag: leunga-20001023-demo-ra
2344    
2345    1. Minor RA changes that improves spilling on x86 (affects Moby and C-- only)
2346    2. Test programs for the graph library updated
2347    3. Some new MLRISC demo programs added
2348    
2349    ----------------------------------------------------------------------
2350    Name: Matthias Blume
2351    Date: 2000/08/31 22:15:00 JST
2352    Tag: blume-20001017-errmsg
2353    Description:
2354    
2355    More error message grief: Where there used to be no messages, there
2356    now were some that had bogus error regions.  Fixed.
2357    
2358    ----------------------------------------------------------------------
2359    Name: Matthias Blume
2360    Date: 2000/08/31 17:30:00 JST
2361    Tag: blume-20001017-v110p29p1
2362    Description:
2363    
2364    I made a version 110.29.1 with new bootfiles.
2365    
2366    Changes:  Modified pickler/unpickler for faster and leaner unpickling.
2367              CM documentation changes and a small bugfix in CM's error reporting.
2368    
2369    ----------------------------------------------------------------------
2370    Name: Lal George
2371    Date: 2000/09/27 14:42:35 EDT
2372    Tag: george-20000927-nodestatus
2373    Description:
2374    
2375    Changed the type of the nodestatus, so that:
2376    
2377            SPILLED(~1)             is now SPILLED
2378            SPILLED(m) where m>=0   is now MEMREG(m)
2379            SPILLED(s) where s<~1   is now SPILL_LOC(~s)
2380    
2381    ----------------------------------------------------------------------
2382    Name: Matthias Blume
2383    Date: 2000/09/07 14:45:00 JST
2384    Tag: blume-20000907-cmerrmsg
2385    Description:
2386    
2387    Small tweak to CM to avoid getting ML syntax error messages twice.
2388    
2389    ----------------------------------------------------------------------
2390    Name: Matthias Blume
2391    Date: 2000/08/31 18:00:00 JST
2392    Tag: blume-20000831-cvsbootfiles
2393    Description:
2394    
2395    New URL for boot files (because the 110.29 files on the BL server do
2396    now work correctly with my updated install scripts for yacc and lex).
2397    
2398    ----------------------------------------------------------------------
2399    Name: Matthias Blume
2400    Date: 2000/08/08 12:33:00 JST
2401    Tag: blume-20000808-manual
2402    Description:
2403    
2404    Tiny update to CM manual.
2405    
2406    ----------------------------------------------------------------------
2407    Name: Allen Leung
2408    Date: 2000/08/7 19:31:00
2409    Tag: leunga-20000807-a-whole-bunch-of-stuff
2410    
2411      Moby, C--, SSA, x86, machine descriptions etc.  Should only affect C--
2412    and Mobdy.
2413    
2414    1.  x86
2415    
2416       a.  Fixes to peephole module by John and Dan.
2417       b.  Assembly fix to SETcc by Allen.
2418       c.  Fix to c-call by John.
2419       d.  Fix to spilling by John.  (This one deals with the missing FSTPT case)
2420       e.  Instruction selection optimization to SETcc as suggested by John.
2421    
2422           For example,
2423    
2424            MV(32, x, COND(32, CMP(32, LT, a, b), LI 1, LI 0))
2425    
2426           should generate:
2427    
2428            MOVL a, x
2429            SUBL b, x
2430            SHRL 31, x
2431    
2432    2.  IR stuff
2433    
2434         A bunch of new DJ-graph related algorithms added.  These
2435         speed up SSA construction.
2436    
2437    3.  SSA + Scheduling
2438    
2439         Added code for SSA and scheduling to the repository
2440    
2441    ----------------------------------------------------------------------
2442    Name: Lal George
2443    Date: 2000/07/27 11:53:14 EDT
2444    
2445    Tag: lal-20000727-linux-ppc
2446    Description:
2447    
2448     Made changes to support Linux PPC.
2449     p.s. I have confirmation that the 110.29 boot files work fine.
2450    
2451    ----------------------------------------------------------------------
2452    Name: Matthias Blume
2453    Date: 2000/07/27 17:40:00 JST
2454    Tag: blume-20000727-scripts
2455    Description:
2456    
2457    !!!! WARNING !!!!
2458    You must recompile the runtime system!
2459    !!!! WARNING !!!!
2460    
2461    This is basically another round of script-enhancements:
2462    
2463    1. sml, ml-build, and ml-makedepend accept options -D and -U to define
2464       and undefine CM preprocessor symbols.
2465    
2466    2. ml-build avoids generating a new heap image if it finds that the
2467       existing one is still ok.  (The condition is that no ML file had to
2468       be recompiled and all ML files are found to be older that the heap
2469       file.)
2470    
2471       To make this work smoothly, I also hacked the runtime system as
2472       well as SMLofNJ.SysInfo to get access to the heap image suffix
2473       (.sparc-solaris, ...) that is currently being used.
2474    
2475       Moreover, the signature of CM.mk_standalone has changed.  See the
2476       CM manual.
2477    
2478    3. ml-makedepend accepts additional options -n, -a, and -o.  (See the
2479       CM manual for details.)
2480    
2481    4. More CM manual updates:
2482        - all of the above has been documented.
2483        - there is now a section describing the (CM-related) command line
2484          arguments that are accepted by the "sml" command
2485    
2486    ----------------------------------------------------------------------
2487    Name: Matthias Blume
2488    Date: 2000/07/25 16:20:00 JST
2489    Tag: blume-20000725-makedepend
2490    Description:
2491    
2492    Added a script called ml-makedepend.  This can be used in makefiles
2493    for Unix' make in a way very similar to the "makedepend" command for
2494    C.
2495    
2496    The script internally uses function CM.sources.
2497    
2498    Synopsis:
2499    
2500        ml-makedepend [-f makefile] cmfile targetname
2501    
2502    The default for the makefile is "makefile" (or "Makefile" should
2503    "makefile" not exist).
2504    
2505    ml-makedepend adds a cmfile/targetname-specific section to this
2506    makefile (after removing the previous version of this section).  The
2507    section contains a single dependency specification with targetname on
2508    the LHS (targetname is an arbitrary name), and a list of files derived
2509    from the cmfile on the RHS.  Some of the files on the RHS are
2510    ARCH/OPSYS-specific.  Therefore, ml-makedepend inserts references to
2511    "make" variables $(ARCH) and $(OPSYS) in place of the corresponding
2512    path names.  The makefile writer is responsible for making sure that
2513    these variables have correct at the time "make" is invoked.
2514    
2515    ----------------------------------------------------------------------
2516    Name: Matthias Blume
2517    Date: 2000/07/22 23:30:00 JST
2518    Tag: blume-20000722-urlupdate
2519    Description:
2520    
2521    Changed BOOT and config/srcarchiveurl to point to BL server:
2522    
2523        ftp://ftp.research.bell-labs.com/dist/smlnj/working/110.29/
2524    
2525    ----------------------------------------------------------------------
2526    Name: Matthias Blume
2527    Date: 2000/07/18 18:00:00 JST
2528    Tag: blume-20000718-Version_110_29
2529    Description:
2530    
2531    1. Updated src/compiler/TopLevel/main/version.sml to version 110.29
2532    
2533    2. Updated config/version to 110.29
2534    
2535    3. Updated config/srcarchiveurl
2536    
2537    3. New boot files!
2538       ftp://ftp.cs.princeton.edu/pub/people/blume/sml/110.29-autofetch
2539    
2540    ----------------------------------------------------------------------
2541    Name: Matthias Blume
2542    Date: 2000/07/11 13:58:00 JST
2543    Tag: blume-20000711-doctypo
2544    Description:
2545    
2546    Fixed a few typos in CM manual.
2547    
2548    ----------------------------------------------------------------------
2549    Name: Allen Leung
2550    Date: 2000/06/15 00:38:00
2551    Tag: leunga-20000704-sparc-x86
2552    
2553    1. x86 peephole improvement sp += k; sp -= k => nop  [from John]
2554    2. fix to x86 RET bug [found by Dan Grossman]
2555    3. sparc assembly bug fix for ticc instructions [found by Fermin]
2556    
2557       Affects c-- and moby only
2558    
2559    ----------------------------------------------------------------------
2560    Name: Matthias Blume
2561    Date: 2000/07/04 15:26:00
2562    Tag: blume-20000704-trigger
2563    Description:
2564    
2565    1. Improvements to CM manual.
2566    2. SMLofNJ.Internals.BTrace.trigger reinstated as an alternative way
2567       of getting a back-trace.  The function, when called, raises an
2568       internal exception which explicitly carries the full back-trace history,
2569       so it is unaffected by any intervening handle-raise pairs ("trivial"
2570       or not).  The interactive loop will print that history once it arrives
2571       at top level.
2572       Short of having all exceptions implicitly carry the full history, the
2573       recommended way of using this facility is:
2574         - compile your program with instrumentation "on"
2575         - run it, when it raises an exception, look at the history
2576         - if the history is "cut off" because of some handler, go and modify
2577           your program so that it explicitly calls BTrace.trigger
2578         - recompile (still instrumented), and rerun; look at the full history
2579    
2580    ----------------------------------------------------------------------
2581    Name: Matthias Blume
2582    Date: 2000/07/03 15:36:00 JST
2583    Tag: blume-20000702-manual
2584    Description:
2585    
2586    Small corrections and updates to CM manual.
2587    
2588    ----------------------------------------------------------------------
2589    Name: Matthias Blume
2590    Date: 2000/06/29 16:04:00 JST
2591    Tag: blume-20000629-yacctool
2592    Description:
2593    
2594    Changes:
2595    
2596    1. Class "mlyacc" now takes separate arguments to pass options to
2597       generated .sml- and .sig-files independently.
2598    2. Corresponding CM manual updates.
2599    3. BTrace module now also reports call sites.  (However, for loop clusters
2600       it only shows from where the cluster was entered.)  There are associated
2601       modifications to core.sml, internals.{sig,sml}, btrace.sml, and btimp.sml.
2602    
2603    ----------------------------------------------------------------------
2604    Name: Matthias Blume
2605    Date: 2000/06/27 16:51:00 JST
2606    Tag: blume-20000627-noweb
2607    Description:
2608    
2609    Changes:
2610    
2611     1. Implemented "subdir" and "witness" options for noweb tool.
2612        This caused some slight internal changes in CM's tool implementation.
2613     2. Fixed bug in "tool plugin" mechanism.  This is essentially cleaning
2614        some remaining issues from earlier path anchor changes.
2615     3. Updated CM manual accordingly.
2616    
2617     4. Changed implementation of back-tracing so that I now consider it
2618        ready for prime-time.
2619    
2620        In particular, you don't have to explicitly trigger the back-trace
2621        anymore.  Instead, if you are running BTrace-instrumented code and
2622        there is an uncaught exception (regardless of whether or not it was
2623        raised in instrumented code), the top-level evalloop will print
2624        the back-trace.
2625    
2626        Features:
2627    
2628          - Instrumented and uninstrumented code work together seemlessly.
2629            (Of course, uninstrumented code is never mentioned in actual
2630             back-traces.)
2631    
2632          - Asymptotic time- and space-complexity of instrumented code is
2633            equal to that of uninstrumented code.  (This means that
2634            tail-recursion is preserved by the instrumentation phase.)
2635    
2636          - Modules whose code has been instrumented in different sessions
2637            work together without problem.
2638    
2639          - There is no penalty whatsoever on uninstrumented code.
2640    
2641          - There is no penalty on "raise" expressions, even in
2642            instrumented code.
2643    
2644        A potential bug (or perhaps it is a feature, too):
2645    
2646          A back-trace reaches no further than the outermost instrumented
2647          non-trivial "raise".  Here, a "trivial" raise is one that is the
2648          sole RHS of a "handle" rule.  Thus, back-traces reach trough
2649    
2650               <exp> handle e => raise e
2651    
2652          and even
2653    
2654               <exp> handle Foo => raise Bar
2655    
2656          and, of course, through
2657    
2658               <exp> handle Foo => ...
2659    
2660         if the exception was not Foo.
2661    
2662         Back-traces always reach right through any un-instrumented code
2663         including any of its "handle" expressions, trivial or not.
2664    
2665       To try this out, do the following:
2666    
2667         - Erase all existing binfiles for your program.
2668           (You may keep binfiles for those modules where you think you
2669            definitely don't need back-tracing.)
2670         - Turn on back-trace instrumentation:
2671              SMLofNJ.Internals.BTrace.mode (SOME true);
2672         - Recompile your program.  (I.e., run "CM.make" or "use".)
2673         - You may now turn instrumentation off again (if you want):
2674              SMLofNJ.Internals.BTrace.mode (SOME false);
2675         - Run your program as usual.  If it raises an exception that
2676           reaches the interactive toplevel, then a back-trace will
2677           automatically be printed.  After that, the toplevel loop
2678           will print the exception history as usual.
2679    
2680    ----------------------------------------------------------------------
2681    Name: Matthias Blume
2682    Date: 2000/06/26 09:56:46 JST
2683    Tag: blume-20000626-setup
2684    Description:
2685    
2686    CM: - setup-parameter to "sml" added; this can be used to run arbitrary
2687          ML code before and after compiling a file (e.g., to set compiler
2688          flags)
2689    
2690    Compiler: - improved btrace API (in core.sml, internals.{sig,sml})
2691              - associated changes to btrace.sml (BTrace instrumentation pass)
2692              - cleaner implementation of btimp.sml (BTrace tracing and report
2693                module)
2694    
2695    CM manual: * new path encoding documented
2696               * description of setup-parameter to "sml" added
2697    
2698    The biggest user-visible change to back-tracing is that it is no
2699    longer necessary to compile all traced modules within the same
2700    session.  (This was a real limitation.)
2701    
2702    ----------------------------------------------------------------------
2703    Name: Matthias Blume
2704    Date: 2000/06/24 12:40:00 JST
2705    Tag: blume-20000624-startup
2706    Description:
2707    
2708    Fixes startup slowdown problem.  (I was calling SrcPath.sync a _tad_
2709    bit too often -- to put it mildly. :)
2710    
2711    ----------------------------------------------------------------------
2712    Name: Matthias Blume
2713    Date: 2000/06/23 18:20:00 JST
2714    Tag: blume-20000623-btrace
2715    Description:
2716    
2717    This updates adds a backtrace facility to aid programmers in debugging
2718    their programs.  This involves the following changes:
2719    
2720    1. Module system/smlnj/init/core.sml (structure _Core) now has hooks for
2721       keeping track of the current call stack.  When programs are compiled
2722       in a special mode, the compiler will insert calls to these hooks
2723       into the user program.
2724       "Hook" means that it is possible for different implementations of
2725       back-tracing to register themselves (at different times).
2726    
2727    2. compiler/MiscUtil/profile/btrace.sml implements the annotation phase
2728       as an Absyn.dec->Absyn.dec rewrite.  Normally this phase is turned off.
2729       It can be turned on using this call:
2730         SMLofNJ.Internals.BTrace.mode (SOME true);
2731       Turning it off again:
2732         SMLofNJ.Internals.BTrace.mode (SOME false);
2733       Querying the current status:
2734         SMLofNJ.Internals.BTrace.mode NONE;
2735       Annotated programs are about twice as big as normal ones, and they
2736       run a factor of 2 to 4 slower with a dummy back-trace plugin (one
2737       where all hooks do nothing).  The slowdown with a plugin that is
2738       actually useful (such as the one supplied by default) is even greater,
2739       but in the case of the default plugin it is still only an constant
2740       factor (amortized).
2741    
2742    3. system/Basis/Implementation/NJ/internals.{sig,sml} have been augmented
2743       with a sub-structure BTrace for controlling back-tracing.  In particular,
2744       the above-mentioned function "mode" controls whether the annotation
2745       phase is invoked by the compiler.  Another important function is
2746       "trigger": when called it aborts the current execution and causes
2747       the top-level loop to print a full back-trace.
2748    
2749    4. compiler/MiscUtil/profile/btimp.sml is the current default plugin
2750       for back-tracing.  It keeps track of the dynamic call stack and in
2751       addition to that it keeps a partial history at each "level" of that
2752       stack.  For example, if a tail-calls b, b tail-calls c, and c tail-calls
2753       d and b (at separate times, dynamically), then the report will show:
2754    
2755       GOTO   d
2756             /c
2757       GOTO  \b
2758       CALL   a
2759    
2760       This shows that there was an initial non-tail call of a, then a
2761       tail-call to b or c, looping behavior in a cluster of functions that
2762       consist of b and c, and then a goto from that cluster (i.e., either from
2763       b or from c) to d.
2764    
2765       Note that (depending on the user program) the amount of information
2766       that the back-trace module has to keep track of at each level is bounded
2767       by a constant.  Thus, the whole implementation has the same asymptotical
2768       complexity as the original program (both in space and in time).
2769    
2770    5. compiler/TopLevel/interact/evalloop.sml has been modified to
2771       handle the special exception SMLofNJ.Internals.BTrace.BTrace
2772       which is raised by the "trigger" function mentioned above.
2773    
2774    Notes on usage:
2775    
2776    - Annotated code works well together with unannotated code:
2777    Unannotated calls simply do not show up at all in the backtrace.
2778    
2779    - It is not a good idea to let modules that were annotated during
2780    different sessions run at the same time.  This is because the compiler
2781    chooses small integers to identify individual functions, and there
2782    will be clashes if different modules were compiled in separate sessions.
2783    (Nothing will crash, and you will even be told about the clashes, but
2784    back-trace information will in general not be useful.)
2785    
2786    - Back-tracing can be confused by callcc and capture.
2787    
2788    - The only way of getting a back-trace right now is to explicitly
2789    invoke the "trigger" function from your user program.  Eventually, we
2790    should make every exception carry back-trace information (if
2791    available).  But since this creates more overhead at "raise"-time
2792    (similar to the current exnHistory overhead), I have not yet
2793    implemented this.  (The implementation will be rather easy.)  With
2794    exceptions carrying back-trace information, this facility will be even
2795    more useful because users don't need to modify their programs...
2796    
2797    - While it is possible to compile the compiler with back-trace
2798    annotations turned on (I did it to get some confidence in
2799    correctness), you must make absolutely sure that core.sml and
2800    btimp.sml are compiled WITHOUT annotation!  (core.sml cannot actually
2801    be compiled with annotation because there is no core access yet, but
2802    if you compile btimp.sml with annotation, then the system will go into
2803    an infinite recursion and crash.)
2804    Since CM currently does not know about BTrace, the only way to turn
2805    annotations on and off for different modules of the compiler is to
2806    interrupt CMB.make, change the settings, and re-invoke it.  Of course,
2807    this is awkward and clumsy.
2808    
2809    Sample sessions:
2810    
2811    Standard ML of New Jersey v110.28.1 [FLINT v1.5], June 5, 2000
2812    - SMLofNJ.Internals.BTrace.mode (SOME true);
2813    [autoloading]
2814    [autoloading done]
2815    val it = false : bool
2816    - structure X = struct
2817    -     fun main n = let
2818    -         fun a (x, 0) = d x
2819    -           | a (x, n) = b (x, n - 1)
2820    -         and b (x, n) = c (x, n)
2821    -         and c (x, n) = a (x, n)
2822    -         and d x = e (x, 3)
2823    -         and e (x, 0) = f x
2824    -           | e (x, n) = e (x, n - 1)
2825    -         and f 0 = SMLofNJ.Internals.BTrace.trigger ()
2826    -           | f n = n * g (n - 1)
2827    -         and g n = a (n, 3)
2828    -     in
2829    -         f n
2830    -     end
2831    - end;
2832    structure X : sig val main : int -> int end
2833    - X.main 3;
2834    *** BACK-TRACE ***
2835    GOTO   stdIn:4.2-13.20: X.main[2].f
2836    GOTO-( stdIn:4.2-13.20: X.main[2].e
2837    GOTO   stdIn:4.2-13.20: X.main[2].d
2838         / stdIn:4.2-13.20: X.main[2].a
2839         | stdIn:4.2-13.20: X.main[2].b
2840    GOTO-\ stdIn:4.2-13.20: X.main[2].c
2841    CALL   stdIn:4.2-13.20: X.main[2].g
2842    GOTO   stdIn:4.2-13.20: X.main[2].f
2843    GOTO-( stdIn:4.2-13.20: X.main[2].e
2844    GOTO   stdIn:4.2-13.20: X.main[2].d
2845         / stdIn:4.2-13.20: X.main[2].a
2846         | stdIn:4.2-13.20: X.main[2].b
2847    GOTO-\ stdIn:4.2-13.20: X.main[2].c
2848    CALL   stdIn:4.2-13.20: X.main[2].g
2849    GOTO   stdIn:4.2-13.20: X.main[2].f
2850    GOTO-( stdIn:4.2-13.20: X.main[2].e
2851    GOTO   stdIn:4.2-13.20: X.main[2].d
2852         / stdIn:4.2-13.20: X.main[2].a
2853         | stdIn:4.2-13.20: X.main[2].b
2854    GOTO-\ stdIn:4.2-13.20: X.main[2].c
2855    CALL   stdIn:4.2-13.20: X.main[2].g
2856    GOTO   stdIn:4.2-13.20: X.main[2].f
2857    CALL   stdIn:2.15-17.4: X.main[2]
2858    -
2859    
2860    (Note that because of a FLINt bug the above code currently does not
2861    compile without BTrace turned on.)
2862    
2863    Here is another example, using my modified Tiger compiler:
2864    
2865    Standard ML of New Jersey v110.28.1 [FLINT v1.5], June 5, 2000
2866    - SMLofNJ.Internals.BTrace.mode (SOME true);
2867    [autoloading]
2868    [autoloading done]
2869    val it = false : bool
2870    - CM.make "sources.cm";
2871    [autoloading]
2872    ...
2873    [autoloading done]
2874    [scanning sources.cm]
2875    [parsing (sources.cm):parse.sml]
2876    [creating directory CM/SKEL ...]
2877    [parsing (sources.cm):tiger.lex.sml]
2878    ...
2879    [wrote CM/sparc-unix/semant.sml]
2880    [compiling (sources.cm):main.sml]
2881    [wrote CM/sparc-unix/main.sml]
2882    [New bindings added.]
2883    val it = true : bool
2884    - Main.compile ("../testcases/merge.tig", "foo.out");
2885    *** BACK-TRACE ***
2886    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trvar
2887    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
2888    CALL   lib/semant.sml:289.3-295.22: SemantFun[2].transExp.trexp.check[2]
2889    GOTO   lib/semant.sml:289.3-295.22: SemantFun[2].transExp.trexp.check[2]
2890    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
2891    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
2892    CALL   lib/semant.sml:488.3-505.6: SemantFun[2].transDec.trdec[2].transBody[2]
2893         / lib/semant.sml:411.65-543.8: SemantFun[2].transDec
2894    CALL-\ lib/semant.sml:413.2-540.9: SemantFun[2].transDec.trdec[2]
2895    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
2896    CALL   lib/semant.sml:8.52-558.4: SemantFun[2].transProg[2]
2897    CALL   main.sml:1.18-118.4: Main.compile[2]
2898    -
2899    
2900    ----------------------------------------------------------------------
2901    Name: Matthias Blumen
2902    Date: 2000/06/21 18:00:00 JST
2903    Tag: blume-20000621-manual
2904    Description:
2905    
2906    CM manual update: Path environments documented.
2907    
2908    ----------------------------------------------------------------------
2909    Name: Matthias Blume
2910    Date: 2000/06/19 13:40:00
2911    Tag: blume-20000619-manual
2912    Description:
2913    
2914    CM manual and system/README update.  This only covers the fact that
2915    there are no more implicit anchors.  (Path environments and the "bind"
2916    option to "cm" have yet to be documented.)
2917    
2918    ----------------------------------------------------------------------
2919    Name: Matthias Blume
2920    Date: 2000/06/19 11:05:00 JST
2921    Tag: blume-20000619-chdir-bugfix
2922    Description:
2923    
2924    Fixed a bug in new SrcPath module that sometimes led to a bad chDir call.
2925    
2926    ----------------------------------------------------------------------
2927    Name: Matthias Blume
2928    Date: 2000/06/18 22:00:10 JST
2929    Tag: blume-20000618-implicit-anchors-really-gone
2930    Description:
2931    
2932    I updates the previous HISTORY entry where I forgot to mention that
2933    implicit anchors are no longer with us.
2934    
2935    The current update also gets rid of the (now useless) controller
2936    CM.Control.implicit_anchors.
2937    
2938    ----------------------------------------------------------------------
2939    Name: Matthias Blume
2940    Date: 2000/06/16 17:30:00 JST
2941    Tag: blume-20000616-anchorenv
2942    Description:
2943    
2944    This patch implements the long anticipated (just kidding :) "anchor
2945    environment" mechanism.  In the course of doing this, I also
2946    re-implemented CM's internal "SrcPath" module from scratch.  The new
2947    one should be more robust in certain boundary cases.  In any case, it
2948    is a lot cleaner than its predecessor (IMHO).
2949    
2950    This time, although there is yet another boot file format change, I
2951    kept the unpickler backward-compatible.  As a result, no new bootfiles
2952    are necessary and bootstrapping is straightforward.  (You cannot read
2953    new bootfiles into an old system, but the other way around is no
2954    problem.)
2955    
2956    Visible changes:
2957    
2958    ** 0. Implicit path anchors (without the leading $-symbol) are no
2959    longer recognized at all. This means that such path names are not
2960    illegal either.  For example, the name basis.cm simply refers to a
2961    local file called "basis.cm" (i.e, the name is an ordinary path
2962    relative to .cm-files directory).  Or, to put it differently, only
2963    names that start with $ are anchored paths.
2964    
2965    ** 1. The $<singlearc> abbreviation for $/<singlearc> has finally
2966    vanished.
2967    
2968    John (Reppy) had critizised this as soon as I originally proposed and
2969    implemented it, but at that time I did not really deeply believe
2970    him. :) Now I came full-circle because I need the $<singlearc> syntax
2971    in another place where it cannot be seen as an abbreviation for
2972    $/<singlearc>.  To avoid the confusion, $<singlearc> now means what it
2973    seems to mean (i.e., it "expands" into the corresponding anchor
2974    value).
2975    
2976    However, when paths are used as members in CM description files, it
2977    continues to be true that there must be at least another arc after the
2978    anchor.  This is now enforced separately during semantic analysis
2979    (i.e., from a lexical/syntactical point of view, the notation is ok.)
2980    
2981    ** 2. The "cm" class now accepts an option "bind".  The option's value
2982    is a sub-option list of precisely two items -- one labeled "anchor"
2983    and the other one labeled "value".  As you might expect, "anchor" is
2984    used to specify an anchor name to be bound, and "value" specifies what
2985    the anchor is being bound to.
2986    
2987    The value must be a directory name and can be given in either standard
2988    syntax (including the possibility that it is itself an anchored path)
2989    or native syntax.
2990    
2991    Examples:
2992    
2993       foo.cm (bind:(anchor:bar value:$mystuff/bar))
2994       lib.cm (bind:(anchor:a value:"H:\\x\\y\\z"))  (* only works under windows *)
2995    
2996    and so on.
2997    
2998    The meaning of this is that the .cm-file will be processed with an
2999    augmented anchor environment where the given anchor(s) is/are bound to
3000    the given values(s).
3001    
3002    The rationale for having this feature is this: Suppose you are trying
3003    to use two different (already stable) libraries a.cm and b.cm (that
3004    you perhaps didn't write yourself).  Further, suppose each of these
3005    two libraries internally uses its own auxiliary library $aux/lib.cm.
3006    Normally you would now have a problem because the anchor "lib" can not
3007    be bound to more than one value globally.  Therefore, the project that
3008    uses both a.cm and b.cm must locally redirect the anchor to some other
3009    place:
3010    
3011       a.cm (bind:(anchor:lib value:/usr/lib/smlnj/a-stuff))
3012       b.cm (bind:(anchor:lib value:/usr/lib/smlnj/b-stuff))
3013    
3014    This hard-wires $lib/aux.cm to /usr/lib/smlnj/a-stuff/aux.cm or
3015    /usr/lib/smlnj/b-stuff/aux.cm, respectively.
3016    
3017    Hard-wiring path names is a bit inflexible (and CM will verbosely warn
3018    you when you do so at the time of CM.stabilize).  Therefore, you can
3019    also use an anchored path as the value:
3020    
3021      a.cm (bind:(anchor:lib value:$a-lib))
3022      b.cm (bind:(anchor:lib value:$b-lib))
3023    
3024    Now you can globally configure (using the usual CM.Anchor.anchor or
3025    pathconfig machinery) bindings for "a-lib" and "b-lib".  Since "lib"
3026    itself is always locally bound, setting it globally is no longer
3027    meaningful or necessary (but it does not hurt either).  In fact, "lib"
3028    can still be used as a global anchor for separate purposes.  As a
3029    matter of fact, one can locally define "lib" in terms of a global
3030    "lib":
3031    
3032      a.cm (bind:(anchor:lib value:$lib/a))
3033      b.cm (bind:(anchor:lib value:$lib/b))
3034    
3035    ** 3: The encoding of path names has changed.  This affects the way
3036    path names are shown in CM's progress report and also the internal
3037    protocol encoding used for parallel make.
3038    
3039    The encoding now uses one or more ':'-separated segments.  Each
3040    segments corresponds to a file that has been specified relative to the
3041    file given by its preceding segment.  The first segment is either
3042    relative to the CWD, absolute, or anchored.  Each segment itself is
3043    basically a Unix pathname; all segments but the first are relative.
3044    
3045    Example:
3046    
3047       $foo/bar/baz.cm:a/b/c.sml
3048    
3049    This path denotes the file bar/a/b/c.sml relative to the directory
3050    denoted by anchor "foo".  Notice that the encoding also includes
3051    baz.cm which is the .cm-file that listed a/b/c.sml.  As usual, such
3052    paths are resolved relative to the .cm-files directory, so baz.cm must
3053    be ignored to get the "real" pathname.
3054    
3055    To make this fact more obvious, CM puts the names of such "virtual
3056    arcs" into parentheses when they appear in progress reports. (No
3057    parentheses will appear in the internal protocol encoding.)  Thus,
3058    what you really see is:
3059    
3060      $foo/bar/(baz.cm):a/b/c.sml
3061    
3062    I find this notation to be much more informative than before.
3063    
3064    Another new feature of the encoding is that special characters
3065    including parentheses, colons, (back)slashes, and white space are
3066    written as \ddd (where ddd is the decimal encoding of the character).
3067    
3068    *** The CM manual still needs to be updated.
3069    
3070    ----------------------------------------------------------------------
3071    Name: Allen Leung
3072    Date: 2000/06/15 00:38:00
3073    Tag: leunga-20000615-x86-peephole
3074    
3075    x86 Peephole fix by Fermin.  Affects c-- and moby only.
3076    
3077    ----------------------------------------------------------------------
3078    Name: Matthias Blume
3079    Date: 2000/06/12 11:40:00
3080    Tag: blume-20000612-parmakefix
3081    Description:
3082    
3083    More cleanup after changing the file naming scheme: This time I
3084    repaired the parallel make mechanism for CMB.make which I broke earlier.
3085    
3086    ----------------------------------------------------------------------
3087    Name: Allen Leung
3088    Date: 2000/06/09 01:25:00
3089    Tag: leunga-20000609-various
3090    
3091    None of these things should affect normal SML/NJ operations
3092    
3093    1. Peephole improvements provided by Fermin (c--)
3094    2. New annotation DEFUSE for adding extra dependence (moby)
3095    3. New X86 LOCK instructions (moby)
3096    4. New machine description language for reservation tables (scheduling)
3097    5. Fixes to various optimization/analysis modules (branch chaining, dominator
3098       trees etc.)
3099    6. I've changed the CM files so that they can work with versions
3100       110.0.6, 110.25 and 110.28
3101    
3102    ----------------------------------------------------------------------
3103    Name: Matthias Blume
3104    Date: 2000/06/09 12:40:00
3105    Tag: blume-20000609-log
3106    Description:
3107    
3108    - Removed all(?) remaining RCS Log entries from sources.
3109    
3110    - Fixed bug in ml-yacc and ml-lex sources (use explicit anchors for
3111      anchored paths).
3112    
3113    ----------------------------------------------------------------------
3114    Name: Matthias Blume
3115    Date: 2000/06/07 17:00:00 JST
3116    Tag: blume-20000607-no-implicit-anchors
3117    Description:
3118    
3119    1. This update changes the default setting for
3120    CM.Control.implicit_anchors from true to false.  This means that
3121    implicit anchors are no longer permitted by default.  I also tried to
3122    make sure that nothing else still relies on implicit anchors.
3123    (This is the next step on the schedule towards a CM that does not even
3124    have the notion of implicit anchors anymore.)
3125    
3126    2. More CM manual updates.
3127    
3128    3. I managed to track down and fix the pickling bug I mentioned last
3129    time.  Because of the previously existing workaround, this entails no
3130    immediate practical changes.
3131    
3132    ----------------------------------------------------------------------
3133    Name: Matthias Blume
3134    Date: 2000/06/06 11:15:00 JST
3135    Tag: blume-20000606-lazierpickle
3136    Description:
3137    
3138    !!!! NEW BOOT FILES !!!!
3139    
3140    * The main purpose of this update is to make library pickles lazier in
3141    order to reduce the initial space penalty for autoloading a library.
3142    As a result, it is now possible to have $smlnj/compiler.cm
3143    pre-registered.  This should take care of the many complaints or
3144    inquiries about missing structure Compiler.  This required changes to
3145    CM's internal data structures and small tweaks to some algorithms.
3146    
3147    As a neat additional effect, it is no longer necessary (for the sake
3148    of lean heap image files) to distinguish between a "minimal" CM and a
3149    "full" CM.  Now, there is only one CM (i.e., the "full" version:
3150    $smlnj/cm.cm aka $smlnj/cm/full.cm), and it is always available at the
3151    interactive top level. ($smlnj/cm/minimal.cm is gone.)
3152    
3153    To make the life of compiler-hackers easier, "makeml" now also
3154    pre-registers $smlnj/cmb.cm (aka $smlnj/cmb/current.cm).  In other
3155    words, after you bootstrap a new sml for the first time, you will not
3156    have to autoload $smlnj/cmb.cm again afterwards.  (The first time
3157    around you will still have to do it, though.)
3158    
3159    * A second change consists of major updates to the CM manual.  There
3160    are now several appendices with summary information and also a full
3161    specification of the CM description file syntax.
3162    
3163    * In directory src/system I added the script "allcross".  This script
3164    invokes sml and cross-compiles the compiler for all supported
3165    architectures.  (Useful when providing a new set of boot files.)
3166    
3167    * There seems to be a latent bug in my "lazy pickles" mechanism.  I
3168    added a small tweak to pickle-util.sml to work around this problem,
3169    but it is not a proper fix yet.  I will investigate further.  (The
3170    effect of the bug was an inflation of library pickle size.)
3171    
3172    * Version number increased to 110.28.1 (to avoid compatibility problems).
3173    
3174    ----------------------------------------------------------------------
3175    Name: Allen Leung
3176    Date: 2000/05/25 17:28 EDT
3177    Tag: leunga-20000525-ra
3178    Description:
3179    
3180      Fixed a bug in freezing phase of the register allocator.
3181    
3182    ----------------------------------------------------------------------
3183    Name: Allen Leung
3184    Date: 2000/05/15 22:53 EDT
3185    Tag: leunga-20000515-alpha-x86-ra
3186    Description:
3187    
3188      1. Alpha
3189    
3190          Slight cleanup.  Removed the instruction SGNXL
3191    
3192      2. X86
3193    
3194          Added the following instructions to the instruction set:
3195    
3196            ROLx, RORx,
3197            BTx, BTSx, BTLx, BTRx,
3198            XCHGx, and variants with the LOCK prefix
3199    
3200      3. Register Allocation
3201    
3202          The module ra-rewrite-with-renaming has been improved.
3203    
3204      These have no effect on SML/NJ.
3205    
3206    ----------------------------------------------------------------------
3207    Name: Matthias Blume
3208    Date: 2000/05/15 16:20:00 JST
3209    Tag: blume-20000515-lightrebuild
3210    Description:
3211    
3212    1. I added an alternative to "-rebuild" to "makeml".  The difference is
3213       that prior to calling CMB.make' the CM-variable "LIGHT" will be
3214       defined.  In effect, the command will not build any cross-compiler
3215       backends and therefore finish more quickly.
3216    
3217       The "fixpt" script also takes a "-light" switch to be able to use
3218       this new facility while compiling for a fixpoint.
3219    
3220    2. I replaced all mentions of anchored paths in group owner specifications
3221       with simple relative paths (usually starting with "..").
3222       The rationale is that a library's internal workings should not be
3223       compromised by the lack of some anchor.  (An anchor is necessary
3224       for someone who wants to refer to the library by an anchored path,
3225       but it should not be necessary to build the same library in the first
3226       place.)
3227    
3228    3. I changed the way CM's tool mechanism determines the shell command
3229       string used for things like ml-yacc etc. so that it does not break
3230       when CM.Control.implicit_anchors is turned off.
3231    
3232    ----------------------------------------------------------------------
3233    Name: Matthias Blume
3234    Date: 2000/05/12 18:20:00 JST
3235    Tag: blume-20000512-ml-build
3236    Description:
3237    
3238    Fixed a bug in config/_ml-build that prevented ml-yacc and ml-lex from
3239    getting installed properly (by config/install.sh).
3240    
3241    ----------------------------------------------------------------------
3242    Name: Matthias Blume
3243    Date: 2000/05/12 17:30:00 JST
3244    Tag: blume-20000512-anchors
3245    Description:
3246    
3247    !!! NEW BOOT FILES !!!
3248    
3249    This change is in preparation of fading out support for "implicitly
3250    anchored path names".  I went through all sources and used the
3251    explicit (and relatively new) $-notation.  See system/README and the
3252    CM manual for more info on this.
3253    
3254    I also modified the anchoring scheme for some things such as "smlnj",
3255    "MLRISC", "cm", etc. to take advantage of the fact that explicit
3256    anchors are more expressive: anchor name and first arc do not have to
3257    coincide.  This entails the following user-visible change:
3258    
3259    You have to write $smlnj/foo/bar instead of smlnj/foo/bar.  In
3260    particular, when you fire up sml with a command-line argument, say,
3261    e.g.:
3262    
3263       sml '$smlnj/cmb.cm'
3264    
3265    At the ML toplevel prompt:
3266    
3267       CM.autoload "$smlnj/cmb.cm";
3268    
3269    There is also a new controller in CM.Control that can be used to turn
3270    off all remaining support for implicit anchors by saying:
3271    
3272        CM.autoload "$smlnj/
3273        #set CM.Control.implicit_anchors false;
3274    
3275    This causes CM to reject implicitly anchored paths.  This is (for the
3276    time being) less permissive than the "final" version where there will
3277    be no more such implicit anchors and relative paths will be just that:
3278    relative.
3279    
3280    The next step (version after next version?) will be to make the
3281    default for CM.Control.implicit_anchors false.  After the dust has
3282    settled, I can then produce the "final" version of this...
3283    
3284    Note: Since bootstrapping is a bit tricky, I provided new boot files.
3285    
3286    ----------------------------------------------------------------------
3287    Name: Matthias Blume
3288    Date: 2000/05/11 16:30:00 JST
3289    Tag: blume-20000511-sources
3290    Description:
3291    
3292    The main change is that I added function CM.sources as a generalized
3293    version of the earlier CM.makedepend.  This entails the following
3294    additional changes:
3295    
3296      - CM.makedepend has been dropped.
3297    
3298      - CM manual has been updated.
3299    
3300      - TOOLS signature and API have been changed.
3301    
3302    ----------------------------------------------------------------------
3303    Name: Allen Leung
3304    Date: 2000/05/10 21:17 EDT
3305    Tag: leunga-20000510-moby-c--ssa
3306    Description:
3307    
3308      Various bug fixes and new features for C--, Moby and MLRISC optimizations.
3309    None of these affect SML/NJ.
3310    
3311    1. Register Allocation
3312    
3313        a. A new ra spilling module (ra/ra-spill-with-renaming) is implemented.
3314           This module tries to remove local (i.e. basic block level) redundancies
3315           during spilling.
3316    
3317        b. A new framework for performing region based register allocation.
3318           Not yet entirely functional.
3319    
3320    2. X86
3321    
3322       a. DefUse for POP was missing the stack pointer [found by Lal]
3323       b. Reload for CALL was incorrect in X86Spill [found by John]
3324       c. Various fixes in X86Spill so that it can be used correctly for
3325          the new spilling module.
3326    
3327    3. SSA/IR
3328    
3329       a. New module ir/dj-dataflow.sml implements elimination based
3330          data flow analysis.
3331    
3332    4. MLRiscGen
3333    
3334       a. Fix for gc type annotation
3335    
3336    5. MDGen
3337    
3338       Various fixes for machine description -> ml code translation.  For ssa
3339       only.
3340    
3341    ----------------------------------------------------------------------
3342    Name: Allen Leung
3343    Date: 2000/05/08 22:17 EDT
3344    Tag: leunga-20000508-labexp
3345    Description:
3346    
3347      Fermin has found a few assembly problems with constant expressions
3348      generated in LabelExp.  Mostly, the problems involve extra parentheses,
3349      which choke on dumb assemblers.  This is his fix.
3350    
3351  ----------------------------------------------------------------------  ----------------------------------------------------------------------
3352  Name: Dave MacQueen  Name: Dave MacQueen
3353  Date: 2000/04/09 14:00 EDT  Date: 2000/04/09 14:00 EDT
# Line 325  Line 3662 
3662    
3663  3.  Assembly  3.  Assembly
3664    
3665      When generating assemby, resolve the value of client defined constants,      When generating assembly, resolve the value of client defined constants,
3666      instead of generating symbolic values.  This is controlled by the      instead of generating symbolic values.  This is controlled by the
3667      new flag "asm-resolve-constants", which is default to true.      new flag "asm-resolve-constants", which is default to true.
3668    
# Line 348  Line 3685 
3685    
3686  To this end, I arranged that instead of "structure Core" as "structure  To this end, I arranged that instead of "structure Core" as "structure
3687  _Core" is bound in the pervasive environment.  Core access is done via  _Core" is bound in the pervasive environment.  Core access is done via
3688  _Core (which can never be accidentially rebound because _Core is not a  _Core (which can never be accidentally rebound because _Core is not a
3689  legal surface-syntax symbol).  legal surface-syntax symbol).
3690    
3691  The current solution is much cleaner because the core environment is  The current solution is much cleaner because the core environment is
# Line 358  Line 3695 
3695  with dynamic and symbolic parts of the core environment.  with dynamic and symbolic parts of the core environment.
3696    
3697  Remaining hackery (to bind the "magic" symbol _Core) is localized in the  Remaining hackery (to bind the "magic" symbol _Core) is localized in the
3698  compilation mananger's bootstrap compiler (actually: in the "init group"  compilation manager's bootstrap compiler (actually: in the "init group"
3699  handling).  See the comments in src/system/smlnj/init/init.cmi for  handling).  See the comments in src/system/smlnj/init/init.cmi for
3700  more details.  more details.
3701    
# Line 473  Line 3810 
3810     (specified in the .cm file at each instance where the tool's class is     (specified in the .cm file at each instance where the tool's class is
3811     used).     used).
3812    
3813     This was done to accomodate the new "make" and "shell" tools which     This was done to accommodate the new "make" and "shell" tools which
3814     facilitate fairly seemless hookup to portions of code managed using     facilitate fairly seamless hookup to portions of code managed using
3815     Makefiles or Shell scripts.     Makefiles or Shell scripts.
3816    
3817     There are no classes "shared" or "private" anymore.  Instead, the     There are no classes "shared" or "private" anymore.  Instead, the
# Line 486  Line 3823 
3823    
3824     All existing tools are described in the CM manual.     All existing tools are described in the CM manual.
3825    
3826     - Slightly better error handling.  (CM now surpresses many followup     - Slightly better error handling.  (CM now suppresses many followup
3827     error messages that tended to be more annoying than helpful.)     error messages that tended to be more annoying than helpful.)
3828    
3829  2. Major changes to the compiler's static environment data structures.  2. Major changes to the compiler's static environment data structures.
# Line 517  Line 3854 
3854       elaborator). There were a lot of changes during my "linkpath" trials       elaborator). There were a lot of changes during my "linkpath" trials
3855       that could have been reverted to their original state but weren't.       that could have been reverted to their original state but weren't.
3856       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
3857       than what was strictly necessary...  (I _did_ resist the tempation       than what was strictly necessary...  (I _did_ resist the temptation
3858       of doing any "global reformatting" to avoid an untimely death at       of doing any "global reformatting" to avoid an untimely death at
3859       Dave's hands. :)       Dave's hands. :)
3860    
# Line 620  Line 3957 
3957    
3958       I've changed andl to testl in the floating point test sequence       I've changed andl to testl in the floating point test sequence
3959       whenever appropriate.  The Intel optimization guide states that       whenever appropriate.  The Intel optimization guide states that
3960       testl is perferable to andl.       testl is preferable to andl.
3961    
3962  7. RA (x86 only)  7. RA (x86 only)
3963    
# Line 802  Line 4139 
4139    
4140  1. Tools.registerStdShellCmdTool (from smlnj/cm/tool.cm) takes an  1. Tools.registerStdShellCmdTool (from smlnj/cm/tool.cm) takes an
4141  additional argument called "template" which is an optional string that  additional argument called "template" which is an optional string that
4142  specifiel the layout of the tool command line.  See the CM manual for  specifies the layout of the tool command line.  See the CM manual for
4143  explanation.  explanation.
4144    
4145  2. A special-purpose tool can be "regisitered" by simply dropping the  2. A special-purpose tool can be "registered" by simply dropping the
4146  corresponding <...>-tool.cm (and/or <...>-ext.cm) into the same  corresponding <...>-tool.cm (and/or <...>-ext.cm) into the same
4147  directory where the .cm file lives that uses this tool.  (The  directory where the .cm file lives that uses this tool.  (The
4148  behavior/misfeature until now was to look for the tool description  behavior/misfeature until now was to look for the tool description
# Line 849  Line 4186 
4186  rebuild.  Having sets of the form <base><k>.{bin,boot}.<arch>-unix for  rebuild.  Having sets of the form <base><k>.{bin,boot}.<arch>-unix for
4187  <k>=1,2,... is normally not a good idea when invoking fixpt.  However,  <k>=1,2,... is normally not a good idea when invoking fixpt.  However,
4188  they might be the result of an earlier partial run of fixpt (which  they might be the result of an earlier partial run of fixpt (which
4189  perhaps got accidentially killed).  In this case, fixpt will quickly  perhaps got accidentally killed).  In this case, fixpt will quickly
4190  move through what exists before continuing where it left off earlier,  move through what exists before continuing where it left off earlier,
4191  and, thus, saves a lot of time.  and, thus, saves a lot of time.
4192    
# Line 899  Line 4236 
4236    it from that remote directory.    it from that remote directory.
4237    This should simplify installation further:  For machines that have    This should simplify installation further:  For machines that have
4238    access to the internet, just fetch <version>-config.tgz, unpack it,    access to the internet, just fetch <version>-config.tgz, unpack it,
4239    edit config/targets, and go (run config/install.sh).  The scipt will    edit config/targets, and go (run config/install.sh).  The script will
4240    fetch everything else that it might need all by itself.    fetch everything else that it might need all by itself.
4241    
4242    For CVS users, this mechanism is not relevant for source archives, but    For CVS users, this mechanism is not relevant for source archives, but

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