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revision 643, Fri May 12 08:29:15 2000 UTC revision 932, Tue Sep 18 19:35:32 2001 UTC
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11  Date:  Date:
12  Tag: <post-commit CVS tag>  Tag: <post-commit CVS tag>
13  Description:  Description:
14    
15    ----------------------------------------------------------------------
16    Name: Matthias Blume
17    Date: 2001/09/18 15:35:00 EDT
18    Tag: blume-20010918-readme11036
19    Description:
20    
21    Added README files.
22    
23    ----------------------------------------------------------------------
24    Name: Matthias Blume
25    Date: 2001/09/18 11:45:00 EDT
26    Tag: Release_110_36 (retag)
27    Description:
28    
29    Fixed mistake in config/preloads. Retagged as 110.36.
30    
31    ----------------------------------------------------------------------
32    Name: Matthias Blume
33    Date: 2001/09/18 09:40:00 EDT
34    Tag: Release_110_36_orig (tag changed)
35    Description:
36    
37    New version (110.36).  New bootfiles.
38    
39    ----------------------------------------------------------------------
40    Name: Matthias Blume
41    Date: 2001/09/14 16:15:00 EDT
42    Tag: blume-20010914-x86fastfp
43    Description:
44    
45    John committed some changes that Allen made, in particular a (hopefully)
46    correctly working version of the x86-fp module.
47    
48    I changed the default setting of the Control.MLRISC.getFlag "x86-fast-fp"
49    flag to "true".  Everything seems to compile to a fixpoint ok, and
50    "mandelbrot" speeds up by about 15%.
51    
52    ----------------------------------------------------------------------
53    Name: Matthias Blume
54    Date: 2001/09/13 11:20:00 EDT
55    Tag: blume-20010913-minimal
56    Description:
57    
58    1. Stefan Monnier's patch to fix a miscompilation problem that
59       was brought to light by John Reppy's work on Moby.
60    
61    2. Implemented a minimal "structure Compiler" that contains just
62       "version" and "architecture".  The minimal version will be
63       available when the full version is not.  This is for backward-
64       compatibility with code that wants to test Compiler.version.
65    
66    ----------------------------------------------------------------------
67    Name: Matthias Blume
68    Date: 2001/08/28 14:03:00 EDT
69    Tag: blume-20010828-ml-lex
70    Description:
71    
72    Fix for bug 1581, received from Neophytos Michael.
73    
74    ----------------------------------------------------------------------
75    Name: Matthias Blume
76    Date: 2001/08/27 11:20:00 EDT
77    Tag: blume-20010827-readme11035
78    Description:
79    
80    Fleshed out the README file for 110.35.
81    
82    ----------------------------------------------------------------------
83    Name: Matthias Blume
84    Date: 2001/08/24 17:10:00 EDT
85    Tag: Release_110_35
86    Description:
87    
88    New version number (110.35).  New bootfiles.
89    
90    ----------------------------------------------------------------------
91    Name: Lal George
92    Date: 2001/08/24 13:47:18 EDT 2001
93    Tag: george-20010824-MLRISC-graphs
94    Description:
95    
96     removed clusters from MLRISC completely and replaced with graphs.
97    
98    ----------------------------------------------------------------------
99    Name: Matthias Blume
100    Date: 2001/08/23 17:50:00 EDT
101    Tag: blume-20010823-toplevel
102    Description:
103    
104    - some reorganization of the code that implements various kinds of
105      environments in the compiler (static, dynamic, symbolic, combined)
106    - re-implemented the EnvRef module so that evalStream works properly
107      (if the stream contains references to "use", "CM.make", etc.)
108    - cleaned up evalloop.sml and interact.sml (but they need more cleaning)
109    
110    ----------------------------------------------------------------------
111    Name: Matthias Blume
112    Date: 2001/08/20 15:50 EDT
113    Tag: blume20010820-slipup
114    Description:
115    
116    I forgot to commit a few files.  Here they are...
117    
118    ----------------------------------------------------------------------
119    Name: Matthias Blume
120    Date: 2001/08/20 15:35:00 EDT
121    Tag: blume-20010820-debugprof
122    Description:
123    
124    !!!! NEW BOOTFILES !!!!
125    
126    This is another round of reorganizing the compiler sources.  This
127    time the main goal was to factor out all the "instrumentation"
128    passes (for profiling and backtracing) into their own library.
129    The difficulty was to do it in such a way that it does not depend
130    on elaborate.cm but only on elabdata.cm.
131    
132    Therefore there have been further changes to both elaborate.cm and
133    elabdata.cm -- more "generic" things have been moved from the former
134    to the latter.  As a result, I was forced to split the assignment
135    of numbers indicating "primtyc"s into two portions: SML-generic and
136    SML/NJ-specific.  Since it would have been awkward to maintain,
137    I bit the bullet and actually _changed_ the mapping between these
138    numbers and primtycs.  The bottom line of this is that you need
139    a new set of bin- and bootfiles.
140    
141    I have built new bootfiles for all architectures, so doing a fresh
142    checkout and config/install.sh should be all you need.
143    
144    The newly created library's name is
145    
146        $smlnj/viscomp/debugprof.cm
147    
148    and its sources live under
149    
150        src/compiler/DebugProf
151    
152    ----------------------------------------------------------------------
153    Name: Matthias Blume
154    Date: 2001/08/15 17:15:00 EDT
155    Tag: blume-20010815-compreorg
156    Description:
157    
158    This is a first cut at reorganizing the CM libraries that make up the
159    core of the compiler.  The idea is to separate out pieces that could
160    be used independently by tools, e.g., the parser, the typechecker, etc.
161    
162    The current status is a step in this direction, but it is not quite
163    satisfactory yet.  Expect more changes in the future.
164    
165    Here is the current (new) organization...
166    
167        What used to be $smlnj/viscomp/core.cm is now divided into
168        six CM libraries:
169    
170             $smlnj/viscomp/basics.cm
171                           /parser.cm
172                           /elabdata.cm
173                           /elaborate.cm
174                           /execute.cm
175                           /core.cm
176    
177        The CM files for these libraries live under src/system/smlnj/viscomp.
178        All these libraries are proxy libraries that contain precisely
179        one CM library component.  Here are the locations of the components
180        (all within the src/compiler tree):
181    
182             Basics/basics.cm
183             Parse/parser.cm
184             ElabData/elabdata.cm
185             Elaborator/elaborate.cm
186             Execution/execute.cm
187             core.cm
188    
189         [This organization is the same that has been used already
190         for a while for the architecture-specific parts of the visible
191         compiler and for the old version of core.cm.]
192    
193         As you will notice, many source files have been moved from their
194         respective original locations to a new home in one of the above
195         subtrees.
196    
197         The division of labor between the new libraries is the following:
198    
199             basics.cm:
200                - Simple, basic definitions that pertain to many (or all) of
201                  the other libraries.
202             parser.cm:
203                - The SML parser, producing output of type Ast.dec.
204                - The type family for Ast is also defined and exported here.
205             elabdata.cm:
206                - The datatypes that describe input and output of the elaborator.
207                  This includes types, absyn, and static environments.
208             elaborator.cm:
209                - The SML/NJ type checker and elaborator.
210                  This maps an Ast.dec (with a given static environment) to
211                  an Absyn.dec (with a new static environment).
212                - This libraries implements certain modules that used to be
213                  structures as functors (to remove dependencies on FLINT).
214             execute.cm:
215                - Everything having to do with executing binary code objects.
216                - Dynamic environments.
217             core.cm:
218                - SML/NJ-specific instantiations of the elaborator and MLRISC.
219                - Top-level modules.
220                - FLINT (this should eventually become its own library)
221    
222    Notes:
223    
224    I am not 100% happy with the way I separated the elaborator (and its
225    data structures) from FLINT.  Two instances of the same problem:
226    
227        1. Data structures contain certain fields that carry FLINT-specific
228           information.  I hacked around this using exn and the property list
229           module from smlnj-lib.  But the fact that there are middle-end
230           specific fields around at all is a bit annoying.
231    
232        2. The elaborator calculates certain FLINT-related information.  I tried
233           to make this as abstract as I could using functorization, but, again,
234           the fact that the elaborator has to perform calculations on behalf
235           of the middle-end at all is not nice.
236    
237        3. Having to used exn and property lists is unfortunate because it
238           weakens type checking.  The other alternative (parameterizing
239           nearly *everything*) is not appealing, though.
240    
241    I removed the "rebinding =" warning hack because due to the new organization
242    it was awkward to maintain it.  As a result, the compiler now issues some of
243    these warnings when compiling init.cmi during bootstrap compilation. On
244    the plus side, you also get a warning when you do, for example:
245       val op = = Int32.+
246    which was not the case up to now.
247    
248    I placed "assign" and "deref" into the _Core structure so that the
249    code that deals with the "lazy" keyword can find them there.  This
250    removes the need for having access to the primitive environment
251    during elaboration.
252    
253    ----------------------------------------------------------------------
254    Name: Matthias Blume
255    Date: 2001/08/13
256    Tag: blume-20010813-closures
257    Description:
258    
259    This fix was sent to us by Zhong Shao.  It is supposed to improve the
260    performance of certain loops by avoiding needless closure allocation.
261    
262    ----------------------------------------------------------------------
263    Name: Lal George
264    Date: 2001/07/31 10:03:23 EDT 2001
265    Tag: george-20010731-x86-fmalloc
266    Description: Fixed bug in x86 calls
267    
268        There was a bug where call instructions would mysteriously
269        vanish. The call instruction had to be one that returned
270        a floating point value.
271    
272    ----------------------------------------------------------------------
273    Name: Lal George
274    Date: 2001/07/19 16:36:29 EDT 2001
275    Tag: george-20010719-simple-cells
276    Description:
277    
278    I have dramatically simplified the interface for CELLS in MLRISC.
279    
280    In summary, the cells interface is broken up into three parts:
281    
282      1. CellsBasis : CELLS_BASIS
283    
284            CellsBasis is a top level structure and common for all
285            architectures.  it contains the definitions of basic datatypes
286            and utility  functions over these types.
287    
288      2. functor Cells() : CELLS
289    
290            Cells generates an interface for CELLS that incorporates the
291            specific resources on the target architecture, such as the
292            presence of special register classes, their number and size,
293            and various useful substructures.
294    
295      3. <ARCH>CELLS
296    
297            e.g. SparcCells: SPARCCELLS
298    
299            <ARCH>CELLS usually contains additional bindings for special
300            registers  on the architecture, such as:
301    
302                    val r0 : cell           (* register zero *)
303                    val y : cell            (* Y register *)
304                    val psr : cell          (* processor status register *)
305                    ...
306    
307            The structure returned by applying the Cells functor is opened
308            in this interface.
309    
310    The main implication of all this is that the datatypes for cells is
311    split between CellsBasis and CELLS -- a fairly simple change for user
312    code.
313    
314    In the old scheme the CELLS interface had a definitional binding of
315    the form:
316    
317            signature CELLS = sig
318    
319               structure CellsBasis = CellsBasis
320    
321               ...
322    
323            end
324    
325    With all the sharing constraints that goes on in MLRISC, this old
326    design  quickly leads to errors such as:
327    
328            "structure definition spec inside of sharing ... "
329    
330    
331    and appears to require an unacceptable amount of sharing and where
332    constraint hackery.
333    
334    I think this error message (the interaction of definitional specs and
335    sharing) requires more explanation on our web page.
336    
337    ----------------------------------------------------------------------
338    Name: Matthias Blume
339    Date: 2001/07/19 15:00:00 EDT
340    Tag: blume-20010719-libreorg
341    Description:
342    
343    This update puts together a fairly extensive but straightforward change
344    to the way the libraries that implement the interactive system are
345    organized:
346    
347       The biggest change is the elimination of structure Compiler.  As a
348       replacement for this structure, there is now a CM library
349       (known as $smlnj/compiler.cm or $smlnj/compiler/current.cm)
350       that exports all the substructures of the original structure Compiler
351       directly.  So instead of saying Compiler.Foo.bar one now simply
352       says Foo.bar.  (The CM libraries actually export a collection of
353       structures that is richer than the collection of substructures of
354       structure Compiler.)
355    
356       To make the transition smooth, there is a separate library called
357       $smlnj/compiler/compiler.cm which puts together and exports the
358       original structure Compiler (or at least something very close to it).
359    
360       There are five members of the original structure Compiler
361       that are not exported directly but which instead became members
362       of a new structure Backend (described by signature BACKEND).  These are:
363       structure Profile (: PROFILE), structure Compile (: COMPILE), structure
364       Interact (: INTERACT), structure Machine (: MACHINE), and val
365       architecture (: string).
366    
367       Structure Compiler.Version has become structure CompilerVersion.
368    
369       Cross-compilers for alpha32, hppa, ppc, sparc, and x86 are provided
370       by $smlnj/compiler/<arch>.cm where <arch> is alpha32, hppa, ppc, sparc,
371       or x86, respectively.
372       Each of these exports the same frontend structures that
373       $smlnj/compiler.cm exports.  But they do not have a structure Backend
374       and instead export some structure <Arch>Backend where <Arch> is Alpha32,
375       Hppa, PPC, Sparc, or X86, respectively.
376    
377       Library $smlnj/compiler/all.cm exports the union of the exports of
378       $smlnj/compiler/<arch>.cm
379    
380       There are no structures <Arch>Compiler anymore, use
381       $smlnj/compiler/<arch>.cm instead.
382    
383       Library host-compiler-0.cm is gone.  Instead, the internal library
384       that instantiates CM is now called cm0.cm.  Selection of the host
385       compiler (backend) is no longer done here but. (Responsibility for it
386       now lies with $smlnj/compiler/current.cm.  This seems to be more
387       logical.)
388    
389       Many individual files have been moved or renamed.  Some files have
390       been split into multiple files, and some "dead" files have been deleted.
391    
392    Aside from these changes to library organization, there are also changes
393    to the way the code itself is organized:
394    
395       Structure Binfile has been re-implemented in such a way that it no
396       longer needs any knowledge of the compiler.  It exclusively deals
397       with the details of binfile layout.  It no longer invokes the
398       compiler (for the purpose of creating new prospective binfile
399       content), and it no longer has any knowledge of how to interpret
400       pickles.
401    
402       Structure Compile (: COMPILE) has been stripped down to the bare
403       essentials of compilation.  It no longer deals with linking/execution.
404       The interface has been cleaned up considerably.
405    
406       Utility routines for dealing with linking and execution have been
407       moved into their own substructures.
408    
409       (The ultimate goal of these changes is to provide a light-weight
410       binfile loader/linker (at least for, e.g., stable libraries) that
411       does not require CM or the compiler to be present.)
412    
413    CM documentation has been updated to reflect the changes to library
414    organization.
415    
416    ----------------------------------------------------------------------
417    Name: Matthias Blume
418    Date: 2001/07/10 17:30:00 EDT
419    Tag: Release_110_34
420    Description:
421    
422    Minor tweak to 110.34 (re-tagged):
423    
424      - README.html file added to CVS repository
425      - runtime compiles properly under FreeBSD 3.X and 4.X
426    
427    ----------------------------------------------------------------------
428    Name: Matthias Blume
429    Date: 2001/07/10 17:30:00 EDT
430    Tag: Release_110_34
431    Description:
432    
433    New version number (110.34). New bootfiles.
434    
435    ----------------------------------------------------------------------
436    Name: Matthias Blume
437    Date: 2001/07/09 16:00:00 EDT
438    Tag: blume-20010709-more-varargs
439    Description:
440    
441    I changed the handling of varargs in ml-nlffigen again:
442    The ellipsis ... will now simply be ignored (with an accompanying warning).
443    
444    The immediate effect is that you can actually call a varargs function
445    from ML -- but you can't actually supply any arguments beyond the ones
446    specified explicitly.  (For example, you can call printf with its format
447    string, but you cannot pass additional arguments.)
448    
449    This behavior is only marginally more useful than the one before, but
450    it has the advantage that a function or, more importantly, a function
451    type never gets dropped on the floor, thus avoiding follow-up problems with
452    other types that refer to the offending one.
453    
454    ----------------------------------------------------------------------
455    Name: Matthias Blume
456    Date: 2001/07/09 11:25:00 EDT
457    Tag: blume-20010709-varargs
458    Description:
459    
460    1. ckit-lib.cm now exports structure Error
461    2. ml-nlffigen reports occurences of "..." (i.e., varargs function types)
462       with a warning accompanied by a source location.  Moreover, it
463       merely skips the offending function or type and proceeds with the
464       rest of its work.u  As a result, one can safely feed C code containing
465       "..." to ml-nlffigen.
466    3. There are some internal improvements to CM, providing slightly
467       more general string substitutions in the tools subsystem.
468    
469    ----------------------------------------------------------------------
470    Name: Matthias Blume
471    Date: 2001/06/27 15:10:00 EDT
472    Tag: blume-20010627-concur
473    Description:
474    
475    Fixed a small bug in CM's handling of parallel compilation.
476    (You could observe the bug by Control-C-interrupting an ordinary
477    CMB.make or CM.stabilize and then attaching some compile servers.
478    The result was that all of a sudden the previously interrupted
479    compilation would continue on its own.  This was because of
480    an over-optimization: CM did not bother to clean out certain queues
481    when no servers were attached "anyway", resulting in the contents
482    of these queues to grab control when new servers did get attached.)
483    
484    There is also another minor update to the CM manual.
485    
486    ----------------------------------------------------------------------
487    Name: Matthias Blume
488    Date: 2001/06/26 16:15:00 EDT
489    Tag: blume-20010626-cmdoc
490    Description:
491    
492    Minor typo fixed in CM manual (syntax diagram for libraries).
493    
494    ----------------------------------------------------------------------
495    Name: Matthias Blume
496    Date: 2001/06/25 22:55:00 EDT
497    Tag: blume-20010625-x86pc
498    Description:
499    
500    Fixed a nasty bug in the X86 assembly code that caused signal
501    handlers to fail (crash) randomly.
502    
503    ----------------------------------------------------------------------
504    Name: Matthias Blume
505    Date: 2001/06/25 12:05:00 EDT
506    Tag: blume-20010625-nlffigen
507    Description:
508    
509    This update fixes a number of minor bugs in ml-nlffigen as reported by
510    Nick Carter <nbc@andrew.cmu.edu>.
511    
512      1. Silly but ok typedefs of the form "typedef void myvoid;" are now accepted.
513      2. Default names for generated files are now derived from the name of
514         the C file *without its directory*.  In particular, this causes generated
515         files to be placed locally even if the C file is in some system directory.
516      3. Default names for generated signatures and structures are also derived
517         from the C file name without its directory.  This avoids silly things
518         like "structure GL/GL".
519         (Other silly names are still possible because ml-nlffigen does not do
520          a thorough check of whether generated names are legal ML identifiers.
521          When in doubt, use command line arguments to force particular names.)
522    
523    ----------------------------------------------------------------------
524    Name: Matthias Blume
525    Date: 2001/06/21 12:25:00 EDT
526    Tag: blume-20010621-eXene
527    Description:
528    
529    eXene now compiles and (sort of) works again.
530    
531    The library name (for version > 110.33) is $/eXene.cm.
532    
533    I also added an new example in src/eXene/examples/nbody.  See the
534    README file there for details.
535    
536    ----------------------------------------------------------------------
537    Name: Matthias Blume
538    Date: 2001/06/20 16:40:00 EDT
539    Tag: blume-20010620-cml
540    Description:
541    
542    CML now compiles and works again.
543    
544    Libraries (for version > 110.33):
545    
546      $cml/cml.cm            Main CML library.
547      $cml/basis.cm          CML's version of $/basis.cm.
548      $cml/cml-internal.cm   Internal helper library.
549      $cml/core-cml.cm       Internal helper library.
550      $cml-lib/trace-cml.cm  Tracing facility.
551      $cml-lib/smlnj-lib.cm  CML's version of $/smlnj-lib.cm
552    
553    The installer (config/install.sh) has been taught how to properly
554    install this stuff.
555    
556    ----------------------------------------------------------------------
557    Name: Matthias Blume
558    Date: 2001/06/19 17:55:00 EDT
559    Tag: blume-20010619-instantiate
560    Description:
561    
562    This un-breaks the fix for bug 1432.
563    (The bug was originally fixed in 110.9 but I broke it again some
564    time after that.)
565    
566    ----------------------------------------------------------------------
567    Name: Matthias Blume
568    Date: 2001/06/19 17:25:00 EDT
569    Tag: blume-20010619-signals
570    Description:
571    
572    This should (hopefully) fix the long-standing signal handling bug.
573    (The runtime system was constructing a continuation record with an
574    incorrect descriptor which would cause the GC to drop data on the floor...)
575    
576    ----------------------------------------------------------------------
577    Name: Matthias Blume
578    Date: 2001/06/15 15:05:00 EDT
579    Tag: blume-20010615-moresparc
580    Description:
581    
582    Here is a short late-hour update related to Sparc c-calls:
583    
584     -- made handling of double-word arguments a bit smarter
585    
586     -- instruction selection phase tries to collapse certain clumsily
587        constructed ML-Trees; typical example:
588    
589            ADD(ty,ADD(_,e,LI d1),LI d2)  ->  ADD(ty,e,LI(d1+d2))
590    
591        This currently has no further impact on SML/NJ since mlriscGen does
592        not seem to generate such patterns in the first place, and c-calls
593        (which did generate them in the beginning) has meanwhile been fixed
594        so as to avoid them as well.
595    
596    ----------------------------------------------------------------------
597    Name: Matthias Blume
598    Date: 2001/06/15 15:05:00 EDT
599    Tag: blume-20010615-sparc
600    Description:
601    
602    The purpose of this update is to provide an implementation of NLFFI
603    on Sparc machines.
604    
605    Here are the changes in detail:
606    
607       * src/MLRISC/sparc/c-calls/sparc-c-calls.sml is a new file containing
608       the Sparc implementation of the c-calls API.
609       * The Sparc backend of SML/NJ has been modified to uniformely use %fp
610       for accessing the ML frame.  Thus, we have a real frame pointer and
611       can freely modify %sp without need for an omit-frame-ptr phase.
612       The vfp logic in src/compiler/CodeGen/* has been changed to accomodate
613       this case.
614       * ml-nlffigen has been taught to produce code for different architectures
615       and calling conventions.
616       * In a way similar to what was done in the x86 case, the Sparc
617       backend uses its own specific extension to mltree.  (For example,
618       it needs to be able to generate UNIMP instructions which are part
619       of the calling convention.)
620       * ml-nlffi-lib was reorganized to make it more modular (in particular,
621       to make it easier to plug in new machine- and os-dependent parts).
622    
623    There are some other fairly unrelated bug fixes and cleanups as well:
624    
625       * I further hacked the .cm files for MLRISC tools (like MDLGen) so
626       that they properly share their libraries with existing SML/NJ libraries.
627       * I fixed a minor cosmetic bug in CM, supressing certain spurious
628       follow-up error messages.
629       * Updates to CM/CMB documentation.
630    
631    TODO items:
632    
633       * MLRISC should use a different register as its asmTemp on the Sparc.
634         (The current %o2 is a really bad choice because it is part of the
635         calling conventions, so things might interfere in unexpected ways.)
636    
637    ----------------------------------------------------------------------
638    Name: Matthias Blume
639    Date: 2001/06/07
640    Tag: blume-20010607-calls
641    Description:
642    
643    A number of internal changes related to C calls and calling conventions:
644    
645    1. ML-Tree CALL statements now carry a "pops" field.  It indicates the
646       number of bytes popped implicitly (by the callee).  In most cases
647       this field is 0 but on x86/win32 it is some non-zero value.  This
648       is information provided for the benefit of the "omit-frameptr" pass.
649    2. The CALL instruction on the x86 carries a similar "pops" field.
650       The instruction selection phase copies its value from the ML-Tree
651       CALL statement.
652    3. On all other architectures, the instruction selection phase checks
653       whether "pops=0" and complains if not.
654    4. The c-calls implementation for x86 now accepts two calling conventions:
655       "ccall" and "stdcall".  When "ccall" is selected, the caller cleans
656       up after the call and pops is set to 0.  For "stdcall", the caller
657       does nothing, leaving the cleanup to the callee; pops is set to
658       the number of bytes that were pushed onto the stack.
659    5. The cproto decoder (compiler/Semant/types/cproto.sml) now can
660       distinguish between "ccall" and "stdcall".
661    6. The UNIMP instruction has been added to the supported Sparc instruction
662       set. (This is needed for implementing the official C calling convention
663       on this architecture.)
664    7. I fixed some of the .cm files under src/MLRISC/Tools to make them
665       work with the latest CM.
666    
667    ----------------------------------------------------------------------
668    Name: Matthias Blume
669    Date: 2001/06/05 15:10:00 EDT
670    Tag: blume-20010605-cm-index
671    Description:
672    
673    0. The "lambdasplit" parameter for class "sml" in CM has been documented.
674    
675    1. CM can now generate "index files".  These are human-readable files
676       that list on a per-.cm-file basis each toplevel symbol defined or
677       imported.  The location of the index file for
678       <p>/<d>.cm is <p>/CM/INDEX/<d>.cm.
679       To enable index-file generation, set CM.Control.generate_index to true
680       or export an environment-symbol: export CM_GENERATE_INDEX=true.
681    
682       The CM manual has been updated accordingly.
683    
684    2. I made some slight modifications to the c-calls API in MLRISC.
685    
686         a) There is now a callback to support saving/restoring of
687            dedicated but caller-save registers around the actual call
688            instruction.
689         b) One can optionally specify a comment-annotation for the
690            call instruction.
691    
692    3. SML/NJ (mlriscGen.sml) uses this new API for the rawccall primop.
693       (For example, the comment annotation shows the C prototype of
694        the function being called.)
695    
696    ----------------------------------------------------------------------
697    Name: Matthias Blume
698    Date: 2001/06/01 13:30:00 EDT
699    Tag: blume-20010601-nlffi-cleanup
700    Description:
701    
702    This is mostly a cleanup of MLFFI stuff:
703    
704       - some signature files have been put into a more exposed place
705       - the ugly 'f type parameter is gone (simplifies types tremendously!)
706       - ml-nlffigen changed accordingly
707       - tutorial updated
708    
709    Other changes:
710    
711       - author's affiliation in CM manual(s) updated
712       - some more recognized keywords added to Allen's sml.sty
713    
714    ----------------------------------------------------------------------
715    Name: Matthias Blume
716    Date: 2001/05/25 15:30:00 EDT
717    Tag: blume-20010525-iptr
718    Description:
719    
720      - put the official 110.33-README (as it appears on the ftp server) under
721        CVS
722      - fixed a small bug related to incomplete pointer types in
723        ml-nlffigen
724      - small cosmetic change to the ml-nlffi-lib's "arr" type constructor
725        (it does not need the 'f type parameter)
726    
727    ----------------------------------------------------------------------
728    Name: Matthias Blume
729    Date: 2001/05/23 14:30:00 EDT
730    Tag: Release_110_33
731    Description:
732    
733    New version number (110.33).  New bootfiles.
734    
735    ----------------------------------------------------------------------
736    Name: Matthias Blume
737    Date: 2001/05/22 18:06:00 EDT
738    Tag: blume-20010522-targets
739    Description:
740    
741    Made install.sh use file config/targets.customized if it exists, falling
742    back to config/targets if it doesn't.  This way one can have a customized
743    version of the targets file without touching the "real thing", thus
744    eliminating the constant fear of accidentally checking something bogus
745    back into the CVS repository...  (File config/targets.customized must
746    not be added to the repository!)
747    
748    ----------------------------------------------------------------------
749    Name: Matthias Blume
750    Date: 2001/05/22 16:30:00 EDT
751    Tag: blume-20010522-minitut
752    Description:
753    
754    1. Bug fix in ml-nlffigen; now (hopefully) correctly handling
755       struct returns.
756    2. Added src/ml-nlffi-lib/Doc/mini-tutorial.txt.  This is some very
757       incomplete, preliminary documentation for NLFFI.
758    
759    ----------------------------------------------------------------------
760    Name: Matthias Blume
761    Date: 2001/05/14 11:30:00 EDT
762    Tag: blume-20010514-script
763    Description:
764    
765    Some bugs in install script fixed.
766    
767    In addition to that I also made a slight change to the NLFFI API:
768    Functors generated by ml-nlffigen now take the dynamic library as a
769    straight functor argument, not as a suspended one.  (The original
770    functor code used to force the suspension right away anyway, so there
771    was nothing gained by this complication of the interface.)
772    
773    ----------------------------------------------------------------------
774    Name: Matthias Blume
775    Date: 2001/05/11 14:35:00 EDT
776    Tag: blume-20010511-ml-nlffi
777    Description:
778    
779    I finally took the plunge and added my new FFI code to the main
780    repository.  For x86-linux it is now ready for prime-time.
781    
782    There are two new subdirectories of "src":
783    
784      - ml-nlffi-lib:
785           The utility library for programs using the FFI interface.
786           Here is the implementation of $/c.cm and its associated low-level
787           partners $/c-int.cm and $/memory.cm.
788      - ml-nlffigen:
789           A stand-alone program for generating ML glue code from C source
790           code.
791    
792    Building ml-nlffigen requires $/ckit-lib.cm.
793    
794    The config/install.sh script has been updates to do the Right Thing
795    (hopefully).
796    
797    Notice that the source tree for the C-Kit will not be put under "src"
798    but directly under the installation root directory.  (This is the
799    structure that currently exists on the CVS server when you check out
800    module "sml".)  Fortunately, config/install.sh knows about this oddity.
801    
802    Bugs: No documentation yet.
803    
804    ----------------------------------------------------------------------
805    Name: Matthias Blume
806    Date: 2001/05/09 16:35:00 EDT
807    Tag: blume-20010509-cpscontract
808    Description:
809    
810    Fixed a bug in the accounting code in cpsopt/contract.sml.  (The
811    wrapper/unwrapper elimination did not decrement usage counts and some
812    dead variables got overlooked by the dead-up logic.)
813    
814    ----------------------------------------------------------------------
815    Name: Lal George
816    Date: 2001/05/08  17:26:09 EDT
817    Tag: george-20010508-omit-frameptr
818    Description:
819    
820    Changes to implement the omit-frame-pointer optimization to support
821    raw C calls. For now, there is only support on the Intel x86, but
822    other architectures will follow as more experience is gained with this.
823    
824    
825    ----------------------------------------------------------------------
826    Name: Matthias Blume
827    Date: 2001/05/07 14:40:00 EDT
828    Tag: blume-20010507-proxies
829    Description:
830    
831    I made into "proxy libraries" all libraries that qualify for such a
832    change.  (A qualifying library is a library that has another library or
833    groups as its sole member and repeats that member's export list
834    verbatim.  A proxy library avoids this repetition by omitting its export
835    list, effectively inheriting the list that its (only) member exports.
836    See the CM manual for more explanation.)
837    The main effect is that explicit export lists for these libraries
838    do not have to be kepts in sync, making maintenance a bit easier.
839    
840    I also added copyright notices to many .cm-files.
841    
842    Last but not least, I made a new set of bootfiles.
843    
844    ----------------------------------------------------------------------
845    Name: Matthias Blume
846    Date: 2001/05/04 17:00:00 EDT
847    Tag: blume-20010504-cm-lsplit
848    Description:
849    
850    0. John merged pending changes to $/smlnj-lib.cm
851    
852    1. Allen's previous change accidentally backed out of one of Lal's
853       earlier changes.  I undid this mistake (re-introducing Lal's change).
854    
855    2. I used the new topOrder' function from graph-scc.sml (from $/smlnj-lib.cm)
856       within the compiler where applicable.  There is some code simplification
857       because of that.
858    
859    3. The "split" phase (in FLINT) is now part of the default list of phases.
860       Compiler.Control.LambdaSplitting.* can be used to globally control the
861       lambda-splitting (cross-module-inlining) engine.  In addition to that,
862       it can now also be controlled on a per-source basis: CM has been taught
863       a new tool parameter applicable to ML source files.
864    
865       - To turn lambda-splitting off completely:
866            local open Compiler.Control.LambdaSplitting in
867                val _ = set Off
868            end
869       - To make "no lambda-splitting" the global default (but allow per-source
870         overriding); this is the initial setting:
871            local open Compiler.Control.LambdaSplitting in
872                val _ = set (Default NONE)
873            end
874       - To make "lambda-splitting with aggressiveness a" the global default
875         (and allow per-source overriding):
876            local open Compiler.Control.LambdaSplitting in
877                val _ = set (Default (SOME a))
878            end
879    
880       - To turn lambda-splitting off for a given ML souce file (say: a.sml)
881         write (in the respective .cm-file):
882            a.sml (lambdasplitting:off)
883       - To turn lambda-splitting for a.sml on with minimal aggressiveness:
884            a.sml (lambdasplitting:on)
885       - To turn lambda-splitting for a.sml on with aggressiveness <a> (where
886         <a> is a decimal non-negative integer):
887            a.sml (lambdasplitting:<a>)
888       - To turn lambda-splitting for a.sml on with maximal aggressiveness:
889            a.sml (lambdasplitting:infinity)
890       - To use the global default for a.sml:
891            a.sml (lambdasplitting:default)
892         or simply
893            a.sml
894    
895    ----------------------------------------------------------------------
896    Name: Allen Leung
897    Date: 2001/05/04 01:57:00 EDT
898    Tag: leunga-20010504-sync
899    Description:
900    
901      MLRISC features.
902    
903      1. Fix to CMPXCHG instructions.
904      2. Changed RA interface to allow annotations in callbacks.
905      3. Added a new method to the stream interface to allow annotations updates.
906    
907    ----------------------------------------------------------------------
908    Name: Matthias Blume
909    Date: 2001/05/01 11:45:00 EDT
910    Tag: blume-20010501-pcedittmp
911    Description:
912    
913    Changed install.sh to use the current working directory instead of
914    /usr/tmp for a temporary file (pcedittmp).  The previous choice
915    of /usr/tmp caused trouble with MacOS X because of file premission
916    problems.
917    
918    ----------------------------------------------------------------------
919    Name: Matthias Blume
920    Date: 2001/04/20 11:10:00 EDT
921    Tag: blume-20010420-inMLflag
922    Description:
923    
924     - added vp_limitPtrMask to vproc-state.h
925       (for use by the raw-C-calls mechanism to implement proper interrupt
926        handling)
927     - made the ML compiler aware of various data-structure offsets so it
928       can generate code for accessing the vp_inML flag and vp_limitPtrMask
929     - tweaked mlriscGen.sml to have it emit interrupt-handling code for
930       raw C-calls
931    
932    ----------------------------------------------------------------------
933    Name: Lal George
934    Date: 2001/04/20 09:15:28 EDT
935    Tag: george-20010420-macosX
936    Description:
937    
938     - Changes to port to Mac OS X; Darwin.
939    
940     - In the process I found that sqrt was broken on the PPC, because the
941       fsqrt instruction is not implemented.
942    
943    ----------------------------------------------------------------------
944    Name: Matthias Blume
945    Date: 2001/04/18 12:45:00 EDT
946    Tag: blume-20010418-ccalls
947    Description:
948    
949     - fixed two off-by-4 errors in the x86-specific c-calls implementation
950       (this bug prevented structure arguments containing pointers from being
951        passed correctly)
952     - changed the raw-C-call code in mlriscGen.sml in such a way that
953       structure arguments are represented as a pointer to the beginning
954       of the structure (instead of having a series of synthesized arguments,
955       one for each structure member)
956    
957     - made makeml script's verbosity level configurable via environment
958       variable (MAKEML_VERBOSITY)
959    
960     - eliminated placeholder implementations for f32l, w16s, i16s, and f32s
961       in rawmem-x86.sml; we are now using the real thing
962    
963    ----------------------------------------------------------------------
964    Name: Matthias Blume
965    Date: 2001/03/22 16:25:00 EST
966    Tag: blume-20010322-bootfiles
967    Description:
968    
969    Created a new set of bootfiles (for your automatic installation convenience).
970    
971    ----------------------------------------------------------------------
972    Name: Matthias Blume
973    Date: 2001/03/22 15:10:00 EST
974    Tag: blume-20010322-rawmem-parcm
975    Description:
976    
977    1. All "raw memory access" primitives for the new FFI are implemented now
978       (at least on the x86).
979    2. Some further cleanup of CM's parallel make mechanism.
980    
981    ----------------------------------------------------------------------
982    Name: Matthias Blume
983    Date: 2001/03/19 17:53:00 EST
984    Tag: blume-20010319-parallel
985    Description:
986    
987    Parallel make (using compile servers) now works again.
988    
989    To this end, CM.stabilize and CMB.make have been modified to work in
990    two passes when compile servers are attached:
991       1. Compile everything, do not perform stabilization; this pass
992          uses compile servers
993       2. Stabilize everything; this pass does not use compile servers
994    If there are no compile servers, the two passes are combined into one
995    (as before).  Splitting the passes increases the inherent parallelism
996    in the dependency graph because the entire graph including all
997    libraries is available at the same time.  This, in turn, improves
998    server utilization.  The downside is that the master process will
999    have to do some extra work after compilation is done (because for
1000    technical reasons it must re-read all the binfiles during stabilization).
1001    
1002    ----------------------------------------------------------------------
1003    Name: Matthias Blume
1004    Date: 2001/03/16 12:22:00 EST
1005    Tag: blume-20010316-bootfiles
1006    Description:
1007    
1008    Created a new set of bootfiles (for your automatic installation convenience).
1009    
1010    ----------------------------------------------------------------------
1011    Name: Matthias Blume
1012    Date: 2001/03/16 11:00:00 EST
1013    Tag: blume-20010316-MLTREE-fixup
1014    Description:
1015    
1016    This is a minor fixup for an (untagged) earlier commit by Allen.
1017    (A file was missing).
1018    
1019    ----------------------------------------------------------------------
1020    Name: Allen Leung
1021    Date: Mon Mar  5 18:54:57 EST 2001
1022    Tag: leunga-20010305-cut-support
1023    
1024    1. New support for alternative control-flow in MLTREE.
1025       Currently we support
1026    
1027          FLOW_TO(CALL ...., [k1,...,kn])
1028    
1029       This is needed for 'cuts to' in C-- and try/handle-like constructs
1030       in Moby
1031    
1032       New assembler flag "asm-show-cutsto" to turn on control-flow debugging.
1033    
1034    2. Register Allocator
1035    
1036       Changes in interface [from Fermin, John]
1037    
1038    3. Alpha 8-bit SLL support [Fermin]
1039    
1040    4. All architectures
1041    
1042       A new module (ClusterExpandCopies) for expanding parallel copies.
1043    
1044    ----------------------------------------------------------------------
1045    Name: Allen Leung
1046    Date: 2001/02/27 23:07:00 EST
1047    Tag: leunga-20010227-minor-stuff
1048    
1049    1. Alpha bug fix for CMOVNE
1050    2. Handle mltree COND(..,FCMP ...,...)
1051    3. Bug fix in simplifier
1052    
1053    ----------------------------------------------------------------------
1054    Name: Matthias Blume
1055    Date: 2001/01/30 17:50:00 EST
1056    Tag: blume-20010130-sync
1057    Description:
1058    
1059    This is just a minor update to sync my devel branch with the main brach.
1060    The only visible change is the addition of some README files.
1061    
1062    ----------------------------------------------------------------------
1063    Name: Matthias Blume
1064    Date: 2001/01/12 23:30:00 JST
1065    Tag: blume-20010112-bootfiles
1066    Description:
1067    
1068    Made a new set of bootfiles that goes with the current state of the
1069    repository.
1070    
1071    ----------------------------------------------------------------------
1072    Name: Matthias Blume
1073    Date: 2001/01/12 21:20:00 JST
1074    Tag: blume-20010112-sync
1075    Description:
1076    
1077    I am just flushing out some minor changes that had accumulated in
1078    my private branch in order to sync with the main tree.  (This is
1079    mainly because I had CVS trouble when trying to merge _into_ my
1080    private branch.)
1081    
1082    Most people should be completely unaffected by this.
1083    
1084    ----------------------------------------------------------------------
1085    Name: Allen Leung
1086    Date: Thu Jan 11 21:03:00 EST 2001
1087    Tag: leunga-20010111-labexp=mltree
1088    Description:
1089    
1090    1.  Removed the type LabelExp and replace it by MLTree.
1091    2.  Rewritten mltree-simplify with the pattern matcher tool.
1092    3.  There were some bugs in alpha code generator which would break
1093        64-bit code generation.
1094    4.  Redo the tools to generate code with the
1095    5.  The CM files in MLRISC (and in src/system/smlnj/MLRISC)
1096        are now generated by perl scripts.
1097    
1098    ----------------------------------------------------------------------
1099    Name: Matthias Blume
1100    Date: 2001/01/10 21:55:00 JST
1101    Tag: blume-20010110-rcc
1102    Description:
1103    
1104    The RCC stuff now seems to work (but only on the x86).
1105    This required hacking of the c-calls interface (and -implementation) in
1106    MLRISC.
1107    
1108    Normal compiler users should be unaffected.
1109    
1110    ----------------------------------------------------------------------
1111    Name: Matthias Blume
1112    Date: 2001/01/09 01:20:00 JST
1113    Tag: blume-20010109-rcc
1114    Description:
1115    
1116    This is a fairly big patch, flushing out a large number of pending
1117    changes that I made to my development copy over the last couple of days.
1118    
1119    Of practical relevance at this moment is a workaround for a pickling
1120    bug that Allen ran into the other day.  The cause of the bug itself is
1121    still unknown and it might be hard to fix it properly, but the
1122    workaround has some merits of its own (namely somewhat reducing pickling
1123    overhead for certain libraries).  Therefore, I think this solution should
1124    be satisfactory at this time.
1125    
1126    The rest of the changes (i.e., the vast majority) has to do with my
1127    ongoing efforts of providing direct support for C function calls from
1128    ML.  At the moment there is a new primop "RAW_CCALL", typing magic
1129    in types/cproto.sml (invoked from FLINT/trans/translate.sml), a new
1130    case in the FLINT CPS datatype (RCC), changes to cps/convert.sml to
1131    translate uses of RAW_CCALL into RCC, and changes to mlriscGen.sml to
1132    handle RCC.
1133    
1134    The last part (the changes to mlriscGen.sml) are still known to be
1135    wrong on the x86 and not implemented on all other architectures.  But
1136    the infrastructure is in place. I had to change a few functor
1137    signatures in the backend to be able to route the CCalls interface
1138    from MLRISC there, and I had to specialize the mltree type (on the
1139    x86) to include the necessary extensions. (The extensions themselves
1140    were already there and redy to go in MLRISC/x86).
1141    
1142    Everything should be very happy as soon as someone helps me with
1143    mlriscGen.sml...
1144    
1145    In any case, nothing of this should matter to anyone as long as the
1146    new primop is not being used (which is going to be the case unless you
1147    find it where I hid it :). The rest of the compiler is completely
1148    unaffected.
1149    
1150    ----------------------------------------------------------------------
1151    Name: Matthias Blume
1152    Date: 2001/01/05 00:30:00 JST
1153    Tag: blume-20010105-primops
1154    Description:
1155    
1156    Added some experimental support for work that I am doing right now.
1157    These changes mostly concern added primops, but there is also a new
1158    experimental C library in the runtime system (but currently not enabled
1159    anywhere except on Linux/X86).
1160    
1161    In the course of adding primops (and playing with them), I discovered that
1162    Zhong's INL_PRIM hack (no type info for certain primops) was, in fact, badly
1163    broken.  (Zhong was very right he labeled this stuff as "major gross hack".)
1164    To recover, I made type information in INL_PRIM mandatory and changed
1165    prim.sml as well as built-in.sml accordingly.  The InLine structure now
1166    has complete, correct type information (i.e., no bottom types).
1167    
1168    Since all these changes mean that we need new binfiles, I also bumped the
1169    version number to 110.32.1.
1170    
1171    ----------------------------------------------------------------------
1172    Name: Matthias Blume
1173    Date: 2000/12/30 22:10:00 JST
1174    Tag: blume-20001230-various
1175    Description:
1176    
1177    Added proxy libraries for MLRISC and let MLRISC libraries refer
1178    to each other using path anchors.  (See CM manual for explanation.)
1179    
1180    Updated CM documentation.
1181    
1182    Fixed some bugs in CM.
1183    
1184    Implemented "proxy" libraries (= syntactic sugar for CM).
1185    
1186    Added "-quiet" option to makeml and changed runtime system accordingly.
1187    
1188    Added cleanup handler for exportML to reset timers and compiler stats.
1189    
1190    ----------------------------------------------------------------------
1191    Name: Lal George
1192    Date: 2000/12/22 22:22:58 EST 2000
1193    Tag: Release_110_32
1194    Description:
1195    
1196            Infinite precision used throughout MLRISC.
1197            see MLRISC/mltree/machine-int.sig
1198    
1199    ----------------------------------------------------------------------
1200    Name: Matthias Blume
1201    Date: 2000/12/22 23:16:00 JST
1202    Tag: blume-20001222-warn
1203    Description:
1204    
1205    Corrected wording and formatting of some CM warning message which I
1206    broke in my previous patch.
1207    
1208    ----------------------------------------------------------------------
1209    Name: Matthias Blume
1210    Date: 2000/12/22 21:20:00 JST
1211    Tag: blume-20001222-anchorenv
1212    Description:
1213    
1214    Fixed CM's handling of anchor environments in connection with CMB.make.
1215    
1216    ----------------------------------------------------------------------
1217    Name: Matthias Blume
1218    Date: 2000/12/22 13:15:00 JST
1219    Tag: blume-20001222-cleanup
1220    Description:
1221    
1222    Removed src/cm/ffi which does not (and did not) belong here.
1223    
1224    ----------------------------------------------------------------------
1225    Name: Matthias Blume
1226    Date: 2000/12/21 23:55:00 JST
1227    Tag: blume-20001221-exn
1228    Description:
1229    
1230    Probably most important: CM no longer silently swallows all exceptions
1231    in the compiler.
1232    Plus: some other minor CM changes.  For example, CM now reports some
1233    sizes for generated binfiles (code, data, envpickle, lambdapickle).
1234    
1235    ----------------------------------------------------------------------
1236    Name: Matthias Blume
1237    Date: 2000/12/15 00:01:05 JST
1238    Tag: blume-20001215-dirtool
1239    Description:
1240    
1241    - "dir" tool added.
1242    - improvements and cleanup to Tools structure
1243    - documentation updates
1244    
1245    ----------------------------------------------------------------------
1246    Name: Allen Leung
1247    Date: Thu Dec 14 03:45:24 EST 2000
1248    Description:
1249    Tag:  leunga-20001214-int-inf
1250    Description:
1251    
1252       In IntInf, added these standard functions, which are missing from our
1253    implementation:
1254    
1255        andb : int * int -> int
1256        xorb : int * int -> int
1257        orb  : int * int -> int
1258        notb : int -> int
1259         <<   : int * word -> int
1260        ~>>  : int * word -> int
1261    
1262       Not tested, I hope they are correct.
1263    
1264    ----------------------------------------------------------------------
1265    Name: Allen Leung
1266    Date: Fri Dec  8 19:23:26 EST 2000
1267    Description:
1268    Tag:  leunga-20001208-nowhere
1269    Description:
1270    
1271      Slight improvements to the 'nowhere' tool to handle OR-patterns,
1272    to generate better error messages etc.  Plus a brief manual.
1273    
1274    ----------------------------------------------------------------------
1275    Name: Lal George
1276    Date: 2000/12/08 09:54:02 EST 2000
1277    Tag: Release_110_31
1278    Description:
1279    
1280    - Version 110.31
1281    ----------------------------------------------------------------------
1282    Name: Allen Leung
1283    Date: Thu Dec  7 22:01:04 EST 2000
1284    Tag:  leunga-20001207-cell-monster-hack
1285    Description:
1286    
1287    Major MLRISC internal changes.  Affect all clients.
1288    Summary:
1289    
1290    1.  Type CELLS.cell = int is now replaced by a datatype.
1291        As a result, the old regmap is now gone.  Almost all interfaces
1292        in MLRISC change as a consequence.
1293    
1294    2.  A new brand version of machine description tool (v3.0) that generates
1295        modules expecting the new interface.  The old version is removed.
1296    
1297    3.  The RA interface has been further abstracted into two new functors.
1298        RISC_RA and X86RA.  These functors have much simpler interfaces.
1299        [See also directory MLRISC/demo.]
1300    
1301    4.  Some other new source->source code generation tools are available:
1302    
1303        a. MLRISC/Tools/RewriteGen -- generate rewriters from rules.
1304        b. MLRISC/Tools/WhereGen -- expands conditional pattern matching rules.
1305           I use this tool to generate the peephole optimizers---with the new
1306           cell type changes, peephole rules are becoming difficult to write
1307           without conditional pattern matching.
1308    
1309    5.  More Intmap -> IntHashTable change.  Previous changes by Matthias didn't
1310        cover the entire MLRISC source tree so many things broke.
1311    
1312    6.  CM files have been moved to the subdirectory MLRISC/cm.
1313        They are moved because there are a lot of them and they clutter up the
1314        root dir.
1315    
1316    7.  More detailed documentation to come...
1317    
1318        NOTE: To rebuild from 110.30 (ftp distribution), you'll have to do
1319        a makeml -rebuild first.  This is because of other other
1320        changes that Matthias has made (see below).
1321    
1322    
1323    ----------------------------------------------------------------------
1324    Name: Matthias Blume
1325    Date: 2000/11/30 23:12:00 JST
1326    Tag: blume-20001130-filereorg
1327    Description:
1328    
1329    Some manual updates and some file reorganizations in CM.
1330    
1331    ----------------------------------------------------------------------
1332    Name: Matthias Blume
1333    Date: 2000/11/24 17:45:00 JST
1334    Tag: blume-20001124-link
1335    Description:
1336    
1337    Drastically improved link traversal code for the case that the dynamic
1338    value was already loaded at bootstrap time.  As a result, CM and CMB
1339    now both load blazingly fast -- even on a very slow machine.  Also,
1340    memory consumption has been further reduced by this.
1341    
1342    Warning: The format of the PIDMAP file has changed.  THerefore, to
1343    bootstrap you have to do this:
1344    
1345    1. Run CMB.make
1346    2. Make a symbolic link for the boot directory:
1347         ln -s sml.boot.ARCH-OS xxx
1348    3. "Rebuild" the boot directory:
1349         ./makeml -boot xxx -rebuild sml ; rm xxx
1350    4. Boot normally:
1351          ./makeml
1352    
1353    ----------------------------------------------------------------------
1354    Name: Matthias Blume
1355    Date: 2000/11/21 21:20:00 JST
1356    Tag: blume-20001121-tools
1357    Description:
1358    
1359    Continued hacking on autoloading problem -- with success this time.
1360    Also changed tool-plugin mechanism.  See new CM manual.
1361    
1362    ----------------------------------------------------------------------
1363    Name: Matthias Blume
1364    Date: 2000/11/19 14:30:00 JST
1365    Tag:  blume-20001119-autoload
1366    Description:
1367    
1368    Some hacking to make autoloading faster.  Success for CMB, no success
1369    so far for CM.  There is a reduced structure CM' that autoloads faster.
1370    (This is a temporary, non-documented hack to be eliminated again when
1371    the general problem is solved.)
1372    
1373    ----------------------------------------------------------------------
1374    Name: Matthias Blume
1375    Date: 2000/11/17 14:10:00 JST
1376    Tag: blume-20001117-pickle-lib
1377    Description:
1378    
1379    1. Eliminated comp-lib.cm
1380    2. Made pickle-lib.cm
1381    3. Eliminated all uses of intset.sml (from comp-lib.cm)
1382    4. Replaced all uses of intmap.{sig,sml} (from comp-lib.cm) with
1383       equivalent constructs from smlnj-lib.cm (INtHashTable).
1384    5. Point 4. also goes for those uses of intmap.* in MLRISC.
1385       Duplicated intmap modules thrown out.
1386    6. Hunted down all duplicated SCC code and replaced it with
1387       equivalent stuff (GraphSCCFn from smlnj-lib.cm).
1388    7. Rewrote Feedback module.
1389    8. Moved sortedlist.sml into viscomp-lib.cm.  Eventually it
1390       should be thrown out and equivalent modules from smlnj-lib.cm
1391       should be used (IntRedBlackSet, IntListSet, ...).
1392    
1393    Confirmed that compiler compiles to fixpoint.
1394    
1395    ----------------------------------------------------------------------
1396    Name: Allen Leung
1397    Date: 2000/11/10 18:00:00
1398    Tag: leunga-20001110-new-x86-fp
1399    
1400    A new x86 floating point code generator has been added.
1401    By default this is turned off.  To turn this on, do:
1402    
1403        CM.autoload "$smlnj/compiler.cm";
1404        Compiler.Control.MLRISC.getFlag "x86-fast-fp" := true;
1405    
1406    Changes:
1407    
1408    1.  Changed FTAN to FPTAN so that the assembly output is correct.
1409    2.  Changed the extension callback for FTANGENT to generate:
1410    
1411              fptan
1412              fstp  %st(0)
1413        instead of
1414              fptan
1415              fstpl ftempmem
1416    
1417    3.  Numerous assembly fixes for x86.
1418    
1419    5.  Cleaned up the machine code output module x86/x86MC.sml and added
1420        support for a whole bunch of instructions and addressing modes:
1421    
1422          fadd/fsub/fsubr/fmul/fdiv/fdivr  %st, %st(n)
1423          faddp/fsubp/fsubrp/fmulp/fdivp/fdivrp  %st, %st(n)
1424          fadd/fsub/fsubr/fmul/fdiv/fdivr  %st(n), %st
1425          fiadd/fisub/fisubr/fimul/fidiv/fidivr mem
1426          fxch %st(n)
1427          fld %st(n)
1428          fst %st(n)
1429          fst mem
1430          fstp %st(n)
1431          fucom %st(n)
1432          fucomp %st(n)
1433    
1434        All these are now generated when the fast fp mode is turned on.
1435    
1436    6.  Removed the dedicated registers %st(0), ..., %st(7) from X86CpsRegs
1437    
1438    ----------------------------------------------------------------------
1439    Name: Matthias Blume
1440    Date: 2000/11/09 11:20:00 JST
1441    Tag: blume-20001109-scc
1442    Description:
1443    
1444    Eliminated some code duplication:
1445    
1446    1. Added "where" clause to GraphSCCFn in SML/NJ Library.
1447       (Otherwise the functor is useless.)
1448    2. Used GraphSCCFn where SCCUtilFun was used previously.
1449    3. Got rid of SCCUtilFun (in comp-lib.cm).
1450    
1451    ----------------------------------------------------------------------
1452    Name: Lal George
1453    Date: 2000/11/06 09:02:21 EST 2000
1454    Tag: Release_110_30
1455    Description:
1456    
1457    - Version 110.30
1458    ----------------------------------------------------------------------
1459    Name: Matthias Blume
1460    Date: 2000/11/04 14:45:00
1461    Tag: blume-20001104-mlbuild
1462    Description:
1463    
1464    - Made ml-build faster on startup.
1465    - Documentation fixes.
1466    
1467    ----------------------------------------------------------------------
1468    Name: Matthias Blume
1469    Date: 2000/11/02 17:00:00 JST
1470    Tag: blume-20001102-condcomp
1471    Description:
1472    
1473    - Small tweaks to pickler -- new BOOTFILES!
1474    - Version bumped to 110.29.2.
1475    - Added conditional compilation facility to init.cmi (see comment there).
1476    ----------------------------------------------------------------------
1477    Name: Allen Leung
1478    Date: 2000/10/23 19:31:00
1479    Tag: leunga-20001023-demo-ra
1480    
1481    1. Minor RA changes that improves spilling on x86 (affects Moby and C-- only)
1482    2. Test programs for the graph library updated
1483    3. Some new MLRISC demo programs added
1484    
1485    ----------------------------------------------------------------------
1486    Name: Matthias Blume
1487    Date: 2000/08/31 22:15:00 JST
1488    Tag: blume-20001017-errmsg
1489    Description:
1490    
1491    More error message grief: Where there used to be no messages, there
1492    now were some that had bogus error regions.  Fixed.
1493    
1494    ----------------------------------------------------------------------
1495    Name: Matthias Blume
1496    Date: 2000/08/31 17:30:00 JST
1497    Tag: blume-20001017-v110p29p1
1498    Description:
1499    
1500    I made a version 110.29.1 with new bootfiles.
1501    
1502    Changes:  Modified pickler/unpickler for faster and leaner unpickling.
1503              CM documentation changes and a small bugfix in CM's error reporting.
1504    
1505    ----------------------------------------------------------------------
1506    Name: Lal George
1507    Date: 2000/09/27 14:42:35 EDT
1508    Tag: george-20000927-nodestatus
1509    Description:
1510    
1511    Changed the type of the nodestatus, so that:
1512    
1513            SPILLED(~1)             is now SPILLED
1514            SPILLED(m) where m>=0   is now MEMREG(m)
1515            SPILLED(s) where s<~1   is now SPILL_LOC(~s)
1516    
1517    ----------------------------------------------------------------------
1518    Name: Matthias Blume
1519    Date: 2000/09/07 14:45:00 JST
1520    Tag: blume-20000907-cmerrmsg
1521    Description:
1522    
1523    Small tweak to CM to avoid getting ML syntax error messages twice.
1524    
1525    ----------------------------------------------------------------------
1526    Name: Matthias Blume
1527    Date: 2000/08/31 18:00:00 JST
1528    Tag: blume-20000831-cvsbootfiles
1529    Description:
1530    
1531    New URL for boot files (because the 110.29 files on the BL server do
1532    now work correctly with my updated install scripts for yacc and lex).
1533    
1534    ----------------------------------------------------------------------
1535    Name: Matthias Blume
1536    Date: 2000/08/08 12:33:00 JST
1537    Tag: blume-20000808-manual
1538    Description:
1539    
1540    Tiny update to CM manual.
1541    
1542    ----------------------------------------------------------------------
1543    Name: Allen Leung
1544    Date: 2000/08/7 19:31:00
1545    Tag: leunga-20000807-a-whole-bunch-of-stuff
1546    
1547      Moby, C--, SSA, x86, machine descriptions etc.  Should only affect C--
1548    and Mobdy.
1549    
1550    1.  x86
1551    
1552       a.  Fixes to peephole module by John and Dan.
1553       b.  Assembly fix to SETcc by Allen.
1554       c.  Fix to c-call by John.
1555       d.  Fix to spilling by John.  (This one deals with the missing FSTPT case)
1556       e.  Instruction selection optimization to SETcc as suggested by John.
1557    
1558           For example,
1559    
1560            MV(32, x, COND(32, CMP(32, LT, a, b), LI 1, LI 0))
1561    
1562           should generate:
1563    
1564            MOVL a, x
1565            SUBL b, x
1566            SHRL 31, x
1567    
1568    2.  IR stuff
1569    
1570         A bunch of new DJ-graph related algorithms added.  These
1571         speed up SSA construction.
1572    
1573    3.  SSA + Scheduling
1574    
1575         Added code for SSA and scheduling to the repository
1576    
1577    ----------------------------------------------------------------------
1578    Name: Lal George
1579    Date: 2000/07/27 11:53:14 EDT
1580    
1581    Tag: lal-20000727-linux-ppc
1582    Description:
1583    
1584     Made changes to support Linux PPC.
1585     p.s. I have confirmation that the 110.29 boot files work fine.
1586    
1587    ----------------------------------------------------------------------
1588    Name: Matthias Blume
1589    Date: 2000/07/27 17:40:00 JST
1590    Tag: blume-20000727-scripts
1591    Description:
1592    
1593    !!!! WARNING !!!!
1594    You must recompile the runtime system!
1595    !!!! WARNING !!!!
1596    
1597    This is basically another round of script-enhancements:
1598    
1599    1. sml, ml-build, and ml-makedepend accept options -D and -U to define
1600       and undefine CM preprocessor symbols.
1601    
1602    2. ml-build avoids generating a new heap image if it finds that the
1603       existing one is still ok.  (The condition is that no ML file had to
1604       be recompiled and all ML files are found to be older that the heap
1605       file.)
1606    
1607       To make this work smoothly, I also hacked the runtime system as
1608       well as SMLofNJ.SysInfo to get access to the heap image suffix
1609       (.sparc-solaris, ...) that is currently being used.
1610    
1611       Moreover, the signature of CM.mk_standalone has changed.  See the
1612       CM manual.
1613    
1614    3. ml-makedepend accepts additional options -n, -a, and -o.  (See the
1615       CM manual for details.)
1616    
1617    4. More CM manual updates:
1618        - all of the above has been documented.
1619        - there is now a section describing the (CM-related) command line
1620          arguments that are accepted by the "sml" command
1621    
1622    ----------------------------------------------------------------------
1623    Name: Matthias Blume
1624    Date: 2000/07/25 16:20:00 JST
1625    Tag: blume-20000725-makedepend
1626    Description:
1627    
1628    Added a script called ml-makedepend.  This can be used in makefiles
1629    for Unix' make in a way very similar to the "makedepend" command for
1630    C.
1631    
1632    The script internally uses function CM.sources.
1633    
1634    Synopsis:
1635    
1636        ml-makedepend [-f makefile] cmfile targetname
1637    
1638    The default for the makefile is "makefile" (or "Makefile" should
1639    "makefile" not exist).
1640    
1641    ml-makedepend adds a cmfile/targetname-specific section to this
1642    makefile (after removing the previous version of this section).  The
1643    section contains a single dependency specification with targetname on
1644    the LHS (targetname is an arbitrary name), and a list of files derived
1645    from the cmfile on the RHS.  Some of the files on the RHS are
1646    ARCH/OPSYS-specific.  Therefore, ml-makedepend inserts references to
1647    "make" variables $(ARCH) and $(OPSYS) in place of the corresponding
1648    path names.  The makefile writer is responsible for making sure that
1649    these variables have correct at the time "make" is invoked.
1650    
1651    ----------------------------------------------------------------------
1652    Name: Matthias Blume
1653    Date: 2000/07/22 23:30:00 JST
1654    Tag: blume-20000722-urlupdate
1655    Description:
1656    
1657    Changed BOOT and config/srcarchiveurl to point to BL server:
1658    
1659        ftp://ftp.research.bell-labs.com/dist/smlnj/working/110.29/
1660    
1661    ----------------------------------------------------------------------
1662    Name: Matthias Blume
1663    Date: 2000/07/18 18:00:00 JST
1664    Tag: blume-20000718-Version_110_29
1665    Description:
1666    
1667    1. Updated src/compiler/TopLevel/main/version.sml to version 110.29
1668    
1669    2. Updated config/version to 110.29
1670    
1671    3. Updated config/srcarchiveurl
1672    
1673    3. New boot files!
1674       ftp://ftp.cs.princeton.edu/pub/people/blume/sml/110.29-autofetch
1675    
1676    ----------------------------------------------------------------------
1677    Name: Matthias Blume
1678    Date: 2000/07/11 13:58:00 JST
1679    Tag: blume-20000711-doctypo
1680    Description:
1681    
1682    Fixed a few typos in CM manual.
1683    
1684    ----------------------------------------------------------------------
1685    Name: Allen Leung
1686    Date: 2000/06/15 00:38:00
1687    Tag: leunga-20000704-sparc-x86
1688    
1689    1. x86 peephole improvement sp += k; sp -= k => nop  [from John]
1690    2. fix to x86 RET bug [found by Dan Grossman]
1691    3. sparc assembly bug fix for ticc instructions [found by Fermin]
1692    
1693       Affects c-- and moby only
1694    
1695    ----------------------------------------------------------------------
1696    Name: Matthias Blume
1697    Date: 2000/07/04 15:26:00
1698    Tag: blume-20000704-trigger
1699    Description:
1700    
1701    1. Improvements to CM manual.
1702    2. SMLofNJ.Internals.BTrace.trigger reinstated as an alternative way
1703       of getting a back-trace.  The function, when called, raises an
1704       internal exception which explicitly carries the full back-trace history,
1705       so it is unaffected by any intervening handle-raise pairs ("trivial"
1706       or not).  The interactive loop will print that history once it arrives
1707       at top level.
1708       Short of having all exceptions implicitly carry the full history, the
1709       recommended way of using this facility is:
1710         - compile your program with instrumentation "on"
1711         - run it, when it raises an exception, look at the history
1712         - if the history is "cut off" because of some handler, go and modify
1713           your program so that it explicitly calls BTrace.trigger
1714         - recompile (still instrumented), and rerun; look at the full history
1715    
1716    ----------------------------------------------------------------------
1717    Name: Matthias Blume
1718    Date: 2000/07/03 15:36:00 JST
1719    Tag: blume-20000702-manual
1720    Description:
1721    
1722    Small corrections and updates to CM manual.
1723    
1724    ----------------------------------------------------------------------
1725    Name: Matthias Blume
1726    Date: 2000/06/29 16:04:00 JST
1727    Tag: blume-20000629-yacctool
1728    Description:
1729    
1730    Changes:
1731    
1732    1. Class "mlyacc" now takes separate arguments to pass options to
1733       generated .sml- and .sig-files independently.
1734    2. Corresponding CM manual updates.
1735    3. BTrace module now also reports call sites.  (However, for loop clusters
1736       it only shows from where the cluster was entered.)  There are associated
1737       modifications to core.sml, internals.{sig,sml}, btrace.sml, and btimp.sml.
1738    
1739    ----------------------------------------------------------------------
1740    Name: Matthias Blume
1741    Date: 2000/06/27 16:51:00 JST
1742    Tag: blume-20000627-noweb
1743    Description:
1744    
1745    Changes:
1746    
1747     1. Implemented "subdir" and "witness" options for noweb tool.
1748        This caused some slight internal changes in CM's tool implementation.
1749     2. Fixed bug in "tool plugin" mechanism.  This is essentially cleaning
1750        some remaining issues from earlier path anchor changes.
1751     3. Updated CM manual accordingly.
1752    
1753     4. Changed implementation of back-tracing so that I now consider it
1754        ready for prime-time.
1755    
1756        In particular, you don't have to explicitly trigger the back-trace
1757        anymore.  Instead, if you are running BTrace-instrumented code and
1758        there is an uncaught exception (regardless of whether or not it was
1759        raised in instrumented code), the top-level evalloop will print
1760        the back-trace.
1761    
1762        Features:
1763    
1764          - Instrumented and uninstrumented code work together seemlessly.
1765            (Of course, uninstrumented code is never mentioned in actual
1766             back-traces.)
1767    
1768          - Asymptotic time- and space-complexity of instrumented code is
1769            equal to that of uninstrumented code.  (This means that
1770            tail-recursion is preserved by the instrumentation phase.)
1771    
1772          - Modules whose code has been instrumented in different sessions
1773            work together without problem.
1774    
1775          - There is no penalty whatsoever on uninstrumented code.
1776    
1777          - There is no penalty on "raise" expressions, even in
1778            instrumented code.
1779    
1780        A potential bug (or perhaps it is a feature, too):
1781    
1782          A back-trace reaches no further than the outermost instrumented
1783          non-trivial "raise".  Here, a "trivial" raise is one that is the
1784          sole RHS of a "handle" rule.  Thus, back-traces reach trough
1785    
1786               <exp> handle e => raise e
1787    
1788          and even
1789    
1790               <exp> handle Foo => raise Bar
1791    
1792          and, of course, through
1793    
1794               <exp> handle Foo => ...
1795    
1796         if the exception was not Foo.
1797    
1798         Back-traces always reach right through any un-instrumented code
1799         including any of its "handle" expressions, trivial or not.
1800    
1801       To try this out, do the following:
1802    
1803         - Erase all existing binfiles for your program.
1804           (You may keep binfiles for those modules where you think you
1805            definitely don't need back-tracing.)
1806         - Turn on back-trace instrumentation:
1807              SMLofNJ.Internals.BTrace.mode (SOME true);
1808         - Recompile your program.  (I.e., run "CM.make" or "use".)
1809         - You may now turn instrumentation off again (if you want):
1810              SMLofNJ.Internals.BTrace.mode (SOME false);
1811         - Run your program as usual.  If it raises an exception that
1812           reaches the interactive toplevel, then a back-trace will
1813           automatically be printed.  After that, the toplevel loop
1814           will print the exception history as usual.
1815    
1816    ----------------------------------------------------------------------
1817    Name: Matthias Blume
1818    Date: 2000/06/26 09:56:46 JST
1819    Tag: blume-20000626-setup
1820    Description:
1821    
1822    CM: - setup-parameter to "sml" added; this can be used to run arbitrary
1823          ML code before and after compiling a file (e.g., to set compiler
1824          flags)
1825    
1826    Compiler: - improved btrace API (in core.sml, internals.{sig,sml})
1827              - associated changes to btrace.sml (BTrace instrumentation pass)
1828              - cleaner implementation of btimp.sml (BTrace tracing and report
1829                module)
1830    
1831    CM manual: * new path encoding documented
1832               * description of setup-parameter to "sml" added
1833    
1834    The biggest user-visible change to back-tracing is that it is no
1835    longer necessary to compile all traced modules within the same
1836    session.  (This was a real limitation.)
1837    
1838    ----------------------------------------------------------------------
1839    Name: Matthias Blume
1840    Date: 2000/06/24 12:40:00 JST
1841    Tag: blume-20000624-startup
1842    Description:
1843    
1844    Fixes startup slowdown problem.  (I was calling SrcPath.sync a _tad_
1845    bit too often -- to put it mildly. :)
1846    
1847    ----------------------------------------------------------------------
1848    Name: Matthias Blume
1849    Date: 2000/06/23 18:20:00 JST
1850    Tag: blume-20000623-btrace
1851    Description:
1852    
1853    This updates adds a backtrace facility to aid programmers in debugging
1854    their programs.  This involves the following changes:
1855    
1856    1. Module system/smlnj/init/core.sml (structure _Core) now has hooks for
1857       keeping track of the current call stack.  When programs are compiled
1858       in a special mode, the compiler will insert calls to these hooks
1859       into the user program.
1860       "Hook" means that it is possible for different implementations of
1861       back-tracing to register themselves (at different times).
1862    
1863    2. compiler/MiscUtil/profile/btrace.sml implements the annotation phase
1864       as an Absyn.dec->Absyn.dec rewrite.  Normally this phase is turned off.
1865       It can be turned on using this call:
1866         SMLofNJ.Internals.BTrace.mode (SOME true);
1867       Turning it off again:
1868         SMLofNJ.Internals.BTrace.mode (SOME false);
1869       Querying the current status:
1870         SMLofNJ.Internals.BTrace.mode NONE;
1871       Annotated programs are about twice as big as normal ones, and they
1872       run a factor of 2 to 4 slower with a dummy back-trace plugin (one
1873       where all hooks do nothing).  The slowdown with a plugin that is
1874       actually useful (such as the one supplied by default) is even greater,
1875       but in the case of the default plugin it is still only an constant
1876       factor (amortized).
1877    
1878    3. system/Basis/Implementation/NJ/internals.{sig,sml} have been augmented
1879       with a sub-structure BTrace for controlling back-tracing.  In particular,
1880       the above-mentioned function "mode" controls whether the annotation
1881       phase is invoked by the compiler.  Another important function is
1882       "trigger": when called it aborts the current execution and causes
1883       the top-level loop to print a full back-trace.
1884    
1885    4. compiler/MiscUtil/profile/btimp.sml is the current default plugin
1886       for back-tracing.  It keeps track of the dynamic call stack and in
1887       addition to that it keeps a partial history at each "level" of that
1888       stack.  For example, if a tail-calls b, b tail-calls c, and c tail-calls
1889       d and b (at separate times, dynamically), then the report will show:
1890    
1891       GOTO   d
1892             /c
1893       GOTO  \b
1894       CALL   a
1895    
1896       This shows that there was an initial non-tail call of a, then a
1897       tail-call to b or c, looping behavior in a cluster of functions that
1898       consist of b and c, and then a goto from that cluster (i.e., either from
1899       b or from c) to d.
1900    
1901       Note that (depending on the user program) the amount of information
1902       that the back-trace module has to keep track of at each level is bounded
1903       by a constant.  Thus, the whole implementation has the same asymptotical
1904       complexity as the original program (both in space and in time).
1905    
1906    5. compiler/TopLevel/interact/evalloop.sml has been modified to
1907       handle the special exception SMLofNJ.Internals.BTrace.BTrace
1908       which is raised by the "trigger" function mentioned above.
1909    
1910    Notes on usage:
1911    
1912    - Annotated code works well together with unannotated code:
1913    Unannotated calls simply do not show up at all in the backtrace.
1914    
1915    - It is not a good idea to let modules that were annotated during
1916    different sessions run at the same time.  This is because the compiler
1917    chooses small integers to identify individual functions, and there
1918    will be clashes if different modules were compiled in separate sessions.
1919    (Nothing will crash, and you will even be told about the clashes, but
1920    back-trace information will in general not be useful.)
1921    
1922    - Back-tracing can be confused by callcc and capture.
1923    
1924    - The only way of getting a back-trace right now is to explicitly
1925    invoke the "trigger" function from your user program.  Eventually, we
1926    should make every exception carry back-trace information (if
1927    available).  But since this creates more overhead at "raise"-time
1928    (similar to the current exnHistory overhead), I have not yet
1929    implemented this.  (The implementation will be rather easy.)  With
1930    exceptions carrying back-trace information, this facility will be even
1931    more useful because users don't need to modify their programs...
1932    
1933    - While it is possible to compile the compiler with back-trace
1934    annotations turned on (I did it to get some confidence in
1935    correctness), you must make absolutely sure that core.sml and
1936    btimp.sml are compiled WITHOUT annotation!  (core.sml cannot actually
1937    be compiled with annotation because there is no core access yet, but
1938    if you compile btimp.sml with annotation, then the system will go into
1939    an infinite recursion and crash.)
1940    Since CM currently does not know about BTrace, the only way to turn
1941    annotations on and off for different modules of the compiler is to
1942    interrupt CMB.make, change the settings, and re-invoke it.  Of course,
1943    this is awkward and clumsy.
1944    
1945    Sample sessions:
1946    
1947    Standard ML of New Jersey v110.28.1 [FLINT v1.5], June 5, 2000
1948    - SMLofNJ.Internals.BTrace.mode (SOME true);
1949    [autoloading]
1950    [autoloading done]
1951    val it = false : bool
1952    - structure X = struct
1953    -     fun main n = let
1954    -         fun a (x, 0) = d x
1955    -           | a (x, n) = b (x, n - 1)
1956    -         and b (x, n) = c (x, n)
1957    -         and c (x, n) = a (x, n)
1958    -         and d x = e (x, 3)
1959    -         and e (x, 0) = f x
1960    -           | e (x, n) = e (x, n - 1)
1961    -         and f 0 = SMLofNJ.Internals.BTrace.trigger ()
1962    -           | f n = n * g (n - 1)
1963    -         and g n = a (n, 3)
1964    -     in
1965    -         f n
1966    -     end
1967    - end;
1968    structure X : sig val main : int -> int end
1969    - X.main 3;
1970    *** BACK-TRACE ***
1971    GOTO   stdIn:4.2-13.20: X.main[2].f
1972    GOTO-( stdIn:4.2-13.20: X.main[2].e
1973    GOTO   stdIn:4.2-13.20: X.main[2].d
1974         / stdIn:4.2-13.20: X.main[2].a
1975         | stdIn:4.2-13.20: X.main[2].b
1976    GOTO-\ stdIn:4.2-13.20: X.main[2].c
1977    CALL   stdIn:4.2-13.20: X.main[2].g
1978    GOTO   stdIn:4.2-13.20: X.main[2].f
1979    GOTO-( stdIn:4.2-13.20: X.main[2].e
1980    GOTO   stdIn:4.2-13.20: X.main[2].d
1981         / stdIn:4.2-13.20: X.main[2].a
1982         | stdIn:4.2-13.20: X.main[2].b
1983    GOTO-\ stdIn:4.2-13.20: X.main[2].c
1984    CALL   stdIn:4.2-13.20: X.main[2].g
1985    GOTO   stdIn:4.2-13.20: X.main[2].f
1986    GOTO-( stdIn:4.2-13.20: X.main[2].e
1987    GOTO   stdIn:4.2-13.20: X.main[2].d
1988         / stdIn:4.2-13.20: X.main[2].a
1989         | stdIn:4.2-13.20: X.main[2].b
1990    GOTO-\ stdIn:4.2-13.20: X.main[2].c
1991    CALL   stdIn:4.2-13.20: X.main[2].g
1992    GOTO   stdIn:4.2-13.20: X.main[2].f
1993    CALL   stdIn:2.15-17.4: X.main[2]
1994    -
1995    
1996    (Note that because of a FLINt bug the above code currently does not
1997    compile without BTrace turned on.)
1998    
1999    Here is another example, using my modified Tiger compiler:
2000    
2001    Standard ML of New Jersey v110.28.1 [FLINT v1.5], June 5, 2000
2002    - SMLofNJ.Internals.BTrace.mode (SOME true);
2003    [autoloading]
2004    [autoloading done]
2005    val it = false : bool
2006    - CM.make "sources.cm";
2007    [autoloading]
2008    ...
2009    [autoloading done]
2010    [scanning sources.cm]
2011    [parsing (sources.cm):parse.sml]
2012    [creating directory CM/SKEL ...]
2013    [parsing (sources.cm):tiger.lex.sml]
2014    ...
2015    [wrote CM/sparc-unix/semant.sml]
2016    [compiling (sources.cm):main.sml]
2017    [wrote CM/sparc-unix/main.sml]
2018    [New bindings added.]
2019    val it = true : bool
2020    - Main.compile ("../testcases/merge.tig", "foo.out");
2021    *** BACK-TRACE ***
2022    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trvar
2023    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
2024    CALL   lib/semant.sml:289.3-295.22: SemantFun[2].transExp.trexp.check[2]
2025    GOTO   lib/semant.sml:289.3-295.22: SemantFun[2].transExp.trexp.check[2]
2026    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
2027    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
2028    CALL   lib/semant.sml:488.3-505.6: SemantFun[2].transDec.trdec[2].transBody[2]
2029         / lib/semant.sml:411.65-543.8: SemantFun[2].transDec
2030    CALL-\ lib/semant.sml:413.2-540.9: SemantFun[2].transDec.trdec[2]
2031    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
2032    CALL   lib/semant.sml:8.52-558.4: SemantFun[2].transProg[2]
2033    CALL   main.sml:1.18-118.4: Main.compile[2]
2034    -
2035    
2036    ----------------------------------------------------------------------
2037    Name: Matthias Blumen
2038    Date: 2000/06/21 18:00:00 JST
2039    Tag: blume-20000621-manual
2040    Description:
2041    
2042    CM manual update: Path environments documented.
2043    
2044    ----------------------------------------------------------------------
2045    Name: Matthias Blume
2046    Date: 2000/06/19 13:40:00
2047    Tag: blume-20000619-manual
2048    Description:
2049    
2050    CM manual and system/README update.  This only covers the fact that
2051    there are no more implicit anchors.  (Path environments and the "bind"
2052    option to "cm" have yet to be documented.)
2053    
2054    ----------------------------------------------------------------------
2055    Name: Matthias Blume
2056    Date: 2000/06/19 11:05:00 JST
2057    Tag: blume-20000619-chdir-bugfix
2058    Description:
2059    
2060    Fixed a bug in new SrcPath module that sometimes led to a bad chDir call.
2061    
2062    ----------------------------------------------------------------------
2063    Name: Matthias Blume
2064    Date: 2000/06/18 22:00:10 JST
2065    Tag: blume-20000618-implicit-anchors-really-gone
2066    Description:
2067    
2068    I updates the previous HISTORY entry where I forgot to mention that
2069    implicit anchors are no longer with us.
2070    
2071    The current update also gets rid of the (now useless) controller
2072    CM.Control.implicit_anchors.
2073    
2074    ----------------------------------------------------------------------
2075    Name: Matthias Blume
2076    Date: 2000/06/16 17:30:00 JST
2077    Tag: blume-20000616-anchorenv
2078    Description:
2079    
2080    This patch implements the long anticipated (just kidding :) "anchor
2081    environment" mechanism.  In the course of doing this, I also
2082    re-implemented CM's internal "SrcPath" module from scratch.  The new
2083    one should be more robust in certain boundary cases.  In any case, it
2084    is a lot cleaner than its predecessor (IMHO).
2085    
2086    This time, although there is yet another boot file format change, I
2087    kept the unpickler backward-compatible.  As a result, no new bootfiles
2088    are necessary and bootstrapping is straightforward.  (You cannot read
2089    new bootfiles into an old system, but the other way around is no
2090    problem.)
2091    
2092    Visible changes:
2093    
2094    ** 0. Implicit path anchors (without the leading $-symbol) are no
2095    longer recognized at all. This means that such path names are not
2096    illegal either.  For example, the name basis.cm simply refers to a
2097    local file called "basis.cm" (i.e, the name is an ordinary path
2098    relative to .cm-files directory).  Or, to put it differently, only
2099    names that start with $ are anchored paths.
2100    
2101    ** 1. The $<singlearc> abbreviation for $/<singlearc> has finally
2102    vanished.
2103    
2104    John (Reppy) had critizised this as soon as I originally proposed and
2105    implemented it, but at that time I did not really deeply believe
2106    him. :) Now I came full-circle because I need the $<singlearc> syntax
2107    in another place where it cannot be seen as an abbreviation for
2108    $/<singlearc>.  To avoid the confusion, $<singlearc> now means what it
2109    seems to mean (i.e., it "expands" into the corresponding anchor
2110    value).
2111    
2112    However, when paths are used as members in CM description files, it
2113    continues to be true that there must be at least another arc after the
2114    anchor.  This is now enforced separately during semantic analysis
2115    (i.e., from a lexical/syntactical point of view, the notation is ok.)
2116    
2117    ** 2. The "cm" class now accepts an option "bind".  The option's value
2118    is a sub-option list of precisely two items -- one labeled "anchor"
2119    and the other one labeled "value".  As you might expect, "anchor" is
2120    used to specify an anchor name to be bound, and "value" specifies what
2121    the anchor is being bound to.
2122    
2123    The value must be a directory name and can be given in either standard
2124    syntax (including the possibility that it is itself an anchored path)
2125    or native syntax.
2126    
2127    Examples:
2128    
2129       foo.cm (bind:(anchor:bar value:$mystuff/bar))
2130       lib.cm (bind:(anchor:a value:"H:\\x\\y\\z"))  (* only works under windows *)
2131    
2132    and so on.
2133    
2134    The meaning of this is that the .cm-file will be processed with an
2135    augmented anchor environment where the given anchor(s) is/are bound to
2136    the given values(s).
2137    
2138    The rationale for having this feature is this: Suppose you are trying
2139    to use two different (already stable) libraries a.cm and b.cm (that
2140    you perhaps didn't write yourself).  Further, suppose each of these
2141    two libraries internally uses its own auxiliary library $aux/lib.cm.
2142    Normally you would now have a problem because the anchor "lib" can not
2143    be bound to more than one value globally.  Therefore, the project that
2144    uses both a.cm and b.cm must locally redirect the anchor to some other
2145    place:
2146    
2147       a.cm (bind:(anchor:lib value:/usr/lib/smlnj/a-stuff))
2148       b.cm (bind:(anchor:lib value:/usr/lib/smlnj/b-stuff))
2149    
2150    This hard-wires $lib/aux.cm to /usr/lib/smlnj/a-stuff/aux.cm or
2151    /usr/lib/smlnj/b-stuff/aux.cm, respectively.
2152    
2153    Hard-wiring path names is a bit inflexible (and CM will verbosely warn
2154    you when you do so at the time of CM.stabilize).  Therefore, you can
2155    also use an anchored path as the value:
2156    
2157      a.cm (bind:(anchor:lib value:$a-lib))
2158      b.cm (bind:(anchor:lib value:$b-lib))
2159    
2160    Now you can globally configure (using the usual CM.Anchor.anchor or
2161    pathconfig machinery) bindings for "a-lib" and "b-lib".  Since "lib"
2162    itself is always locally bound, setting it globally is no longer
2163    meaningful or necessary (but it does not hurt either).  In fact, "lib"
2164    can still be used as a global anchor for separate purposes.  As a
2165    matter of fact, one can locally define "lib" in terms of a global
2166    "lib":
2167    
2168      a.cm (bind:(anchor:lib value:$lib/a))
2169      b.cm (bind:(anchor:lib value:$lib/b))
2170    
2171    ** 3: The encoding of path names has changed.  This affects the way
2172    path names are shown in CM's progress report and also the internal
2173    protocol encoding used for parallel make.
2174    
2175    The encoding now uses one or more ':'-separated segments.  Each
2176    segments corresponds to a file that has been specified relative to the
2177    file given by its preceding segment.  The first segment is either
2178    relative to the CWD, absolute, or anchored.  Each segment itself is
2179    basically a Unix pathname; all segments but the first are relative.
2180    
2181    Example:
2182    
2183       $foo/bar/baz.cm:a/b/c.sml
2184    
2185    This path denotes the file bar/a/b/c.sml relative to the directory
2186    denoted by anchor "foo".  Notice that the encoding also includes
2187    baz.cm which is the .cm-file that listed a/b/c.sml.  As usual, such
2188    paths are resolved relative to the .cm-files directory, so baz.cm must
2189    be ignored to get the "real" pathname.
2190    
2191    To make this fact more obvious, CM puts the names of such "virtual
2192    arcs" into parentheses when they appear in progress reports. (No
2193    parentheses will appear in the internal protocol encoding.)  Thus,
2194    what you really see is:
2195    
2196      $foo/bar/(baz.cm):a/b/c.sml
2197    
2198    I find this notation to be much more informative than before.
2199    
2200    Another new feature of the encoding is that special characters
2201    including parentheses, colons, (back)slashes, and white space are
2202    written as \ddd (where ddd is the decimal encoding of the character).
2203    
2204    *** The CM manual still needs to be updated.
2205    
2206    ----------------------------------------------------------------------
2207    Name: Allen Leung
2208    Date: 2000/06/15 00:38:00
2209    Tag: leunga-20000615-x86-peephole
2210    
2211    x86 Peephole fix by Fermin.  Affects c-- and moby only.
2212    
2213    ----------------------------------------------------------------------
2214    Name: Matthias Blume
2215    Date: 2000/06/12 11:40:00
2216    Tag: blume-20000612-parmakefix
2217    Description:
2218    
2219    More cleanup after changing the file naming scheme: This time I
2220    repaired the parallel make mechanism for CMB.make which I broke earlier.
2221    
2222    ----------------------------------------------------------------------
2223    Name: Allen Leung
2224    Date: 2000/06/09 01:25:00
2225    Tag: leunga-20000609-various
2226    
2227    None of these things should affect normal SML/NJ operations
2228    
2229    1. Peephole improvements provided by Fermin (c--)
2230    2. New annotation DEFUSE for adding extra dependence (moby)
2231    3. New X86 LOCK instructions (moby)
2232    4. New machine description language for reservation tables (scheduling)
2233    5. Fixes to various optimization/analysis modules (branch chaining, dominator
2234       trees etc.)
2235    6. I've changed the CM files so that they can work with versions
2236       110.0.6, 110.25 and 110.28
2237    
2238    ----------------------------------------------------------------------
2239    Name: Matthias Blume
2240    Date: 2000/06/09 12:40:00
2241    Tag: blume-20000609-log
2242    Description:
2243    
2244    - Removed all(?) remaining RCS Log entries from sources.
2245    
2246    - Fixed bug in ml-yacc and ml-lex sources (use explicit anchors for
2247      anchored paths).
2248    
2249    ----------------------------------------------------------------------
2250    Name: Matthias Blume
2251    Date: 2000/06/07 17:00:00 JST
2252    Tag: blume-20000607-no-implicit-anchors
2253    Description:
2254    
2255    1. This update changes the default setting for
2256    CM.Control.implicit_anchors from true to false.  This means that
2257    implicit anchors are no longer permitted by default.  I also tried to
2258    make sure that nothing else still relies on implicit anchors.
2259    (This is the next step on the schedule towards a CM that does not even
2260    have the notion of implicit anchors anymore.)
2261    
2262    2. More CM manual updates.
2263    
2264    3. I managed to track down and fix the pickling bug I mentioned last
2265    time.  Because of the previously existing workaround, this entails no
2266    immediate practical changes.
2267    
2268    ----------------------------------------------------------------------
2269    Name: Matthias Blume
2270    Date: 2000/06/06 11:15:00 JST
2271    Tag: blume-20000606-lazierpickle
2272    Description:
2273    
2274    !!!! NEW BOOT FILES !!!!
2275    
2276    * The main purpose of this update is to make library pickles lazier in
2277    order to reduce the initial space penalty for autoloading a library.
2278    As a result, it is now possible to have $smlnj/compiler.cm
2279    pre-registered.  This should take care of the many complaints or
2280    inquiries about missing structure Compiler.  This required changes to
2281    CM's internal data structures and small tweaks to some algorithms.
2282    
2283    As a neat additional effect, it is no longer necessary (for the sake
2284    of lean heap image files) to distinguish between a "minimal" CM and a
2285    "full" CM.  Now, there is only one CM (i.e., the "full" version:
2286    $smlnj/cm.cm aka $smlnj/cm/full.cm), and it is always available at the
2287    interactive top level. ($smlnj/cm/minimal.cm is gone.)
2288    
2289    To make the life of compiler-hackers easier, "makeml" now also
2290    pre-registers $smlnj/cmb.cm (aka $smlnj/cmb/current.cm).  In other
2291    words, after you bootstrap a new sml for the first time, you will not
2292    have to autoload $smlnj/cmb.cm again afterwards.  (The first time
2293    around you will still have to do it, though.)
2294    
2295    * A second change consists of major updates to the CM manual.  There
2296    are now several appendices with summary information and also a full
2297    specification of the CM description file syntax.
2298    
2299    * In directory src/system I added the script "allcross".  This script
2300    invokes sml and cross-compiles the compiler for all supported
2301    architectures.  (Useful when providing a new set of boot files.)
2302    
2303    * There seems to be a latent bug in my "lazy pickles" mechanism.  I
2304    added a small tweak to pickle-util.sml to work around this problem,
2305    but it is not a proper fix yet.  I will investigate further.  (The
2306    effect of the bug was an inflation of library pickle size.)
2307    
2308    * Version number increased to 110.28.1 (to avoid compatibility problems).
2309    
2310    ----------------------------------------------------------------------
2311    Name: Allen Leung
2312    Date: 2000/05/25 17:28 EDT
2313    Tag: leunga-20000525-ra
2314    Description:
2315    
2316      Fixed a bug in freezing phase of the register allocator.
2317    
2318    ----------------------------------------------------------------------
2319    Name: Allen Leung
2320    Date: 2000/05/15 22:53 EDT
2321    Tag: leunga-20000515-alpha-x86-ra
2322    Description:
2323    
2324      1. Alpha
2325    
2326          Slight cleanup.  Removed the instruction SGNXL
2327    
2328      2. X86
2329    
2330          Added the following instructions to the instruction set:
2331    
2332            ROLx, RORx,
2333            BTx, BTSx, BTLx, BTRx,
2334            XCHGx, and variants with the LOCK prefix
2335    
2336      3. Register Allocation
2337    
2338          The module ra-rewrite-with-renaming has been improved.
2339    
2340      These have no effect on SML/NJ.
2341    
2342    ----------------------------------------------------------------------
2343    Name: Matthias Blume
2344    Date: 2000/05/15 16:20:00 JST
2345    Tag: blume-20000515-lightrebuild
2346    Description:
2347    
2348    1. I added an alternative to "-rebuild" to "makeml".  The difference is
2349       that prior to calling CMB.make' the CM-variable "LIGHT" will be
2350       defined.  In effect, the command will not build any cross-compiler
2351       backends and therefore finish more quickly.
2352    
2353       The "fixpt" script also takes a "-light" switch to be able to use
2354       this new facility while compiling for a fixpoint.
2355    
2356    2. I replaced all mentions of anchored paths in group owner specifications
2357       with simple relative paths (usually starting with "..").
2358       The rationale is that a library's internal workings should not be
2359       compromised by the lack of some anchor.  (An anchor is necessary
2360       for someone who wants to refer to the library by an anchored path,
2361       but it should not be necessary to build the same library in the first
2362       place.)
2363    
2364    3. I changed the way CM's tool mechanism determines the shell command
2365       string used for things like ml-yacc etc. so that it does not break
2366       when CM.Control.implicit_anchors is turned off.
2367    
2368    ----------------------------------------------------------------------
2369    Name: Matthias Blume
2370    Date: 2000/05/12 18:20:00 JST
2371    Tag: blume-20000512-ml-build
2372    Description:
2373    
2374    Fixed a bug in config/_ml-build that prevented ml-yacc and ml-lex from
2375    getting installed properly (by config/install.sh).
2376    
2377  ----------------------------------------------------------------------  ----------------------------------------------------------------------
2378  Name: Matthias Blume  Name: Matthias Blume
2379  Date: 2000/05/12 17:30:00 JST  Date: 2000/05/12 17:30:00 JST
# Line 435  Line 2798 
2798    
2799  3.  Assembly  3.  Assembly
2800    
2801      When generating assemby, resolve the value of client defined constants,      When generating assembly, resolve the value of client defined constants,
2802      instead of generating symbolic values.  This is controlled by the      instead of generating symbolic values.  This is controlled by the
2803      new flag "asm-resolve-constants", which is default to true.      new flag "asm-resolve-constants", which is default to true.
2804    
# Line 458  Line 2821 
2821    
2822  To this end, I arranged that instead of "structure Core" as "structure  To this end, I arranged that instead of "structure Core" as "structure
2823  _Core" is bound in the pervasive environment.  Core access is done via  _Core" is bound in the pervasive environment.  Core access is done via
2824  _Core (which can never be accidentially rebound because _Core is not a  _Core (which can never be accidentally rebound because _Core is not a
2825  legal surface-syntax symbol).  legal surface-syntax symbol).
2826    
2827  The current solution is much cleaner because the core environment is  The current solution is much cleaner because the core environment is
# Line 468  Line 2831 
2831  with dynamic and symbolic parts of the core environment.  with dynamic and symbolic parts of the core environment.
2832    
2833  Remaining hackery (to bind the "magic" symbol _Core) is localized in the  Remaining hackery (to bind the "magic" symbol _Core) is localized in the
2834  compilation mananger's bootstrap compiler (actually: in the "init group"  compilation manager's bootstrap compiler (actually: in the "init group"
2835  handling).  See the comments in src/system/smlnj/init/init.cmi for  handling).  See the comments in src/system/smlnj/init/init.cmi for
2836  more details.  more details.
2837    
# Line 583  Line 2946 
2946     (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
2947     used).     used).
2948    
2949     This was done to accomodate the new "make" and "shell" tools which     This was done to accommodate the new "make" and "shell" tools which
2950     facilitate fairly seemless hookup to portions of code managed using     facilitate fairly seamless hookup to portions of code managed using
2951     Makefiles or Shell scripts.     Makefiles or Shell scripts.
2952    
2953     There are no classes "shared" or "private" anymore.  Instead, the     There are no classes "shared" or "private" anymore.  Instead, the
# Line 596  Line 2959 
2959    
2960     All existing tools are described in the CM manual.     All existing tools are described in the CM manual.
2961    
2962     - Slightly better error handling.  (CM now surpresses many followup     - Slightly better error handling.  (CM now suppresses many followup
2963     error messages that tended to be more annoying than helpful.)     error messages that tended to be more annoying than helpful.)
2964    
2965  2. Major changes to the compiler's static environment data structures.  2. Major changes to the compiler's static environment data structures.
# Line 627  Line 2990 
2990       elaborator). There were a lot of changes during my "linkpath" trials       elaborator). There were a lot of changes during my "linkpath" trials
2991       that could have been reverted to their original state but weren't.       that could have been reverted to their original state but weren't.
2992       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
2993       than what was strictly necessary...  (I _did_ resist the tempation       than what was strictly necessary...  (I _did_ resist the temptation
2994       of doing any "global reformatting" to avoid an untimely death at       of doing any "global reformatting" to avoid an untimely death at
2995       Dave's hands. :)       Dave's hands. :)
2996    
# Line 730  Line 3093 
3093    
3094       I've changed andl to testl in the floating point test sequence       I've changed andl to testl in the floating point test sequence
3095       whenever appropriate.  The Intel optimization guide states that       whenever appropriate.  The Intel optimization guide states that
3096       testl is perferable to andl.       testl is preferable to andl.
3097    
3098  7. RA (x86 only)  7. RA (x86 only)
3099    
# Line 912  Line 3275 
3275    
3276  1. Tools.registerStdShellCmdTool (from smlnj/cm/tool.cm) takes an  1. Tools.registerStdShellCmdTool (from smlnj/cm/tool.cm) takes an
3277  additional argument called "template" which is an optional string that  additional argument called "template" which is an optional string that
3278  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
3279  explanation.  explanation.
3280    
3281  2. A special-purpose tool can be "regisitered" by simply dropping the  2. A special-purpose tool can be "registered" by simply dropping the
3282  corresponding <...>-tool.cm (and/or <...>-ext.cm) into the same  corresponding <...>-tool.cm (and/or <...>-ext.cm) into the same
3283  directory where the .cm file lives that uses this tool.  (The  directory where the .cm file lives that uses this tool.  (The
3284  behavior/misfeature until now was to look for the tool description  behavior/misfeature until now was to look for the tool description
# Line 959  Line 3322 
3322  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
3323  <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,
3324  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
3325  perhaps got accidentially killed).  In this case, fixpt will quickly  perhaps got accidentally killed).  In this case, fixpt will quickly
3326  move through what exists before continuing where it left off earlier,  move through what exists before continuing where it left off earlier,
3327  and, thus, saves a lot of time.  and, thus, saves a lot of time.
3328    
# Line 1009  Line 3372 
3372    it from that remote directory.    it from that remote directory.
3373    This should simplify installation further:  For machines that have    This should simplify installation further:  For machines that have
3374    access to the internet, just fetch <version>-config.tgz, unpack it,    access to the internet, just fetch <version>-config.tgz, unpack it,
3375    edit config/targets, and go (run config/install.sh).  The scipt will    edit config/targets, and go (run config/install.sh).  The script will
3376    fetch everything else that it might need all by itself.    fetch everything else that it might need all by itself.
3377    
3378    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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