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Diff of /sml/trunk/HISTORY

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revision 840, Fri Jun 15 19:05:19 2001 UTC revision 1011, Thu Jan 10 20:22:04 2002 UTC
# Line 8  Line 8 
8  The form of an entry should be:  The form of an entry should be:
9    
10  Name:  Name:
11  Date:  Date: yyyy/mm/dd
12  Tag: <post-commit CVS tag>  Tag: <post-commit CVS tag>
13  Description:  Description:
14    ----------------------------------------------------------------------
15    Name: Matthias Blume
16    Date: 2002/01/10
17    Tag: blume-20020110-newffigen
18    Description:
19    
20    1. Updates to portable graph code.
21    
22    2. Major update to ml-nlffigen and ml-nlffi-lib.  Things are much
23       more scalable now so that even huge interfaces such as the one
24       for GTK compile in finite time and space. :-)
25       See src/ml-nlffigen/README for details on what's new.
26    
27    ----------------------------------------------------------------------
28    Name: Lal George
29    Date: 2001/01/09 14:31:35 EST 2002
30    Tag: george-20011206-rm-native-copy
31    Description:
32    
33            Removed the native COPY and FCOPY instructions
34            from all the architectures and replaced it with the
35            explicit COPY instruction from the previous commit.
36    
37            It is now possible to simplify many of the optimizations
38            modules that manipulate copies. This has not been
39            done in this change.
40    
41    ----------------------------------------------------------------------
42    Name: Lal George
43    Date: 2001/12/06 16:50:13 EST 2001
44    Tag: george-20011206-mlrisc-instruction
45    Description:
46    
47    Changed the representation of instructions from being fully abstract
48    to being partially concrete. That is to say:
49    
50      from
51            type instruction
52    
53      to
54            type instr                              (* machine instruction *)
55    
56            datatype instruction =
57                LIVE of {regs: C.cellset, spilled: C.cellset}
58              | KILL of {regs: C.cellset, spilled: C.cellset}
59              | COPYXXX of {k: CB.cellkind, dst: CB.cell list, src: CB.cell list}
60              | ANNOTATION of {i: instruction, a: Annotations.annotation}
61              | INSTR of instr
62    
63    This makes the handling of certain special instructions that appear on
64    all architectures easier and uniform.
65    
66    LIVE and KILL say that a list of registers are live or killed at the
67    program point where they appear. No spill code is generated when an
68    element of the 'regs' field is spilled, but the register is moved to
69    the 'spilled' (which is present, more for debugging than anything else).
70    
71    LIVE replaces the (now deprecated) DEFFREG instruction on the alpha.
72    We used to generate:
73    
74            DEFFREG f1
75            f1 := f2 + f3
76            trapb
77    
78    but now generate:
79    
80            f1 := f2 + f3
81            trapb
82            LIVE {regs=[f1,f2,f3], spilled=[]}
83    
84    Furthermore, the DEFFREG (hack) required that all floating point instruction
85    use all registers mentioned in the instruction. Therefore f1 := f2 + f3,
86    defines f1 and uses [f1,f2,f3]! This hack is no longer required resulting
87    in a cleaner alpha implementation. (Hopefully, intel will not get rid of
88    this architecture).
89    
90    COPYXXX is intended to replace the parallel COPY and FCOPY  available on
91    all the architectures. This will result in further simplification of the
92    register allocator that must be aware of them for coalescing purposes, and
93    will also simplify certain aspects of the machine description that provides
94    callbacks related to parallel copies.
95    
96    ANNOTATION should be obvious, and now INSTR represents the honest to God
97    machine instruction set!
98    
99    The <arch>/instructions/<arch>Instr.sml files define certain utility
100    functions for making porting easier -- essentially converting upper case
101    to lower case. All machine instructions (of type instr) are in upper case,
102    and the lower case form generates an MLRISC instruction. For example on
103    the alpha we have:
104    
105      datatype instr =
106         LDA of {r:cell, b:cell, d:operand}
107       | ...
108    
109      val lda : {r:cell, b:cell, d:operand} -> instruction
110        ...
111    
112    where lda is just (INSTR o LDA), etc.
113    
114    ----------------------------------------------------------------------
115    Name: Matthias Blume
116    Date: 2001/11/22 21:40:00 EST
117    Tag: Release_110_37
118    Description:
119    
120    Release 110.37.  This time for real.
121    
122    ----------------------------------------------------------------------
123    Name: Matthias Blume
124    Date: 2001/11/21 16:35:00 EST
125    Tag: blume-20011121-foot-in-mouth
126    Description:
127    
128    Removed the "Release_110_37" tag because of a serious bug.
129    This will be re-tagged once the bug is fixed.
130    
131    ----------------------------------------------------------------------
132    Name: Matthias Blume
133    Date: 2001/11/21 16:14:00 EST
134    Tag: blume-20011121-forgottenfile
135    Description:
136    
137    Forgot to add a file.  (Just a .tex-file -- part of
138    the CM manual source.)
139    
140    ----------------------------------------------------------------------
141    Name: Matthias Blume
142    Date: 2001/11/21 16:10:00 EST
143    Tag: blume-20011121-invalid_110_37
144    Description:
145    
146    Note: I removed the original tag "Release_110_37" from this commit
147          because we found a serious bug in all non-x86 backends.
148          - Matthias
149    
150    1. Modifications to the SML/NJ code generator and to the runtime system
151       so that code object name strings are directly inserted into code
152       objects at code generation time.  The only business the runtime system
153       has with this is now to read the name strings on occasions.
154       (The encoding of the name string has also changed somewhat.)
155    
156    2. CM now implements a simple "set calculus" for specifying export lists.
157       In particular, it is now possible to refer to the export lists of
158       other libraries/groups/sources and form unions as well as differences.
159       See the latest CM manual for details.
160    
161    3. An separate notion of "proxy" libraries has again be eliminated from
162       CM's model.  (Proxy libraries are now simply a special case of using
163       the export list calculus.)
164    
165    4. Some of the existing libraries now take advantage of the new set
166       calculus.
167       (Notice that not all libraries have been converted because some
168       of the existing .cm-files are supposed to be backward compatible
169       with 110.0.x.)
170    
171    5. Some cleanup in stand-alone programs.  (Don't use "exnMessage" -- use
172       "General.exnMessage"!  The former relies on a certain hook to be
173       initialized, and that often does not happen in the stand-alone case.)
174    
175    ----------------------------------------------------------------------
176    Name: Lal George
177    Date: 2001/11/21  13:56:18 EST
178    Tag: george-2001121-pseudo-ops
179    Description:
180    
181      Implemented a complete redesign of MLRISC pseudo-ops. Now there
182      ought to never be any question of incompatabilities with
183      pseudo-op syntax expected by host assemblers.
184    
185      For now, only modules supporting GAS syntax are implemented
186      but more should follow, such as MASM, and vendor assembler
187      syntax, e.g. IBM as, Sun as, etc.
188    
189    ----------------------------------------------------------------------
190    Name: Matthias Blume
191    Date: 2001/11/14 11:52:00 EST
192    Tag: blume-20011114-srcname
193    Description:
194    
195    1. Routed the name of the current source file to mlriscgen where it
196       should be directly emitted into the code object.  (This last part
197       is yet to be done.)
198    
199    2. Some cleanup of the pgraph code to make it match the proposal that
200       I put out the other day.  (The proposal notwithstanding, things are
201       still in flux here.)
202    
203    ----------------------------------------------------------------------
204    Name: Lal George
205    Date: 2001/11/14 09:44:04 EST
206    Tag:
207    Description:
208    
209      Fix for a backpatching bug reported by Allen.
210    
211      Because the boundary between short and long span-dependent
212      instructions is +/- 128, there are an astounding number of
213      span-dependent instructions whose size is over estimated.
214    
215      Allen came up with the idea of letting the size of span
216      dependent instructions be non-monotonic, for a maxIter
217      number of times, after which the size must be monotonically
218      increasing.
219    
220      This table shows the number of span-dependent instructions
221      whose size was over-estimated as a function of maxIter, for the
222      file Parse/parse/ml.grm.sml:
223    
224         maxIter            # of instructions:
225            10                      687
226            20                      438
227            30                      198
228            40                        0
229    
230      In compiling the compiler, there is no significant difference in
231      compilation speed between maxIter=10 and maxIter=40. Actually,
232      my measurements showed that maxIter=40 was a tad faster than
233      maxIter=10! Also 96% of the  files in the compiler reach a fix
234      point within 13 iterations, so fixing maxIter at 40, while high,
235      is okay.
236    
237    ----------------------------------------------------------------------
238    Name: Matthias Blume
239    Date: 2001/10/31 15:25:00 EST
240    Tag: blume-20011031-pgraph
241    Description:
242    
243    CKIT:
244    * Changed the "Function" constructor of type Ast.ctype to carry optional
245      argument identifiers.
246    * Changed the return type of TypeUtil.getFunction accordingly.
247    * Type equality ignores the argument names.
248    * TypeUtil.composite tries to preserve argument names but gives up quickly
249      if there is a mismatch.
250    
251    installation script:
252    * attempts to use "curl" if available (unless "wget" is available as well)
253    
254    CM:
255    * has an experimental implementation of "portable graphs" which I will
256      soon propose as an implementation-independent library format
257    * there are also new libraries $/pgraph.cm and $/pgraph-util.cm
258    
259    NLFFI-LIB:
260    * some cleanup (all cosmetic)
261    
262    NLFFIGEN:
263    * temporarily disabled the mechanism that suppresses ML output for
264      C definitions whose identifiers start with an underscore character
265    * generate val bindings for enum constants
266    * user can request that only one style (light or heavy) is being used;
267      default is to use both (command-line arguments: -heavy and -light)
268    * fixed bug in handling of function types involving incomplete pointers
269    * generate ML entry points that take record arguments (i.e., using
270      named arguments) for C functions that have a prototype with named
271      arguments
272      (see changes to CKIT)
273    
274    ----------------------------------------------------------------------
275    Name: Allen Leung
276    Date: 2001/10/27 20:34:00 EDT
277    Tag: leunga-20011027-x86-fast-fp-call
278    Description:
279    
280       Fixed the bug described in blume-20010920-slowfp.
281    
282       The fix involves
283          1. generating FCOPYs in FSTP in ia32-svid
284          2. marking a CALL with the appropriate annotation
285    
286    ----------------------------------------------------------------------
287    Name: Matthias Blume
288    Date: 2001/10/16 11:32:00 EDT
289    Tag: blume-20011016-netbsd
290    Description:
291    
292    Underscore patch from Chris Richards (fixing problem with compiling
293    runtime system under recent NetBSD).
294    
295    ----------------------------------------------------------------------
296    Name: Allen Leung
297    Date: 2001/10/12 17:18:32 EDT 2001
298    Tag: leung-20011012-x86-printflowgraph
299    Description:
300    
301    X86RA now uses a valid (instead of dummy) PrintFlowgraph module.
302    
303    ----------------------------------------------------------------------
304    Name: Lal George
305    Date: 2001/10/11 23:51:34 EDT
306    Tag: george-20011011-too-many-instrs
307    Description:
308    
309    The representation of a program point never expected to see more
310    than 65536 instructions in a basic block!
311    
312    ----------------------------------------------------------------------
313    Name: Lal George
314    Date: 2001/10/09 09:41:37 EDT
315    Tag: george-20011008-mlrisc-labels
316    Description:
317    
318    Changed the machine description files to support printing of
319    local and global labels in assembly code, based on host assembler
320    conventions.
321    
322    ----------------------------------------------------------------------
323    Name: Matthias Blume
324    Date: 2001/09/25 15:25:00 EDT
325    Tag: blume-20010925-exninfo
326    Description:
327    
328    I provided a non-hook implementation of exnName (at the toplevel) and
329    made the "dummy" implementation of exnMessage (at the toplevel) more
330    useful: if nothing gets "hooked in", then at least you are going to
331    see the exception name and a message indicating why you don't see more.
332    
333    [For the time being, programs that need exnMessage and want to use
334    ml-build should either use General.exnMessage (strongly recommended) or
335    refer to structure General at some other point so that CM sees a
336    static dependency.]
337    
338    [Similar remarks go for "print" and "use":  If you want to use their
339    functionality in stand-alone programs generated by ml-build, then use
340    TextIO.output and Backend.Interact.useFile (from $smlnj/compiler.cm).]
341    
342    ----------------------------------------------------------------------
343    Name: Matthias Blume
344    Date: 2001/09/20 17:28:00 EDT
345    Tag: blume-20010920-slowfp
346    Description:
347    
348    Allen says that x86-fast-fp is not safe yet, so I turned it off again...
349    
350    ----------------------------------------------------------------------
351    Name: Matthias Blume
352    Date: 2001/09/20 17:20:00 EDT
353    Tag: blume-20010920-canonicalpaths
354    Description:
355    
356    0. Updated the BOOT file (something that I forgot to do earlier).
357    
358    1. Small internal change to CM so that it avoids "/../" in filenames
359       as much as possible (but only where it is safe).
360    
361    2. Changed config/_run-sml (resulting in a changed bin/.run-sml) so
362       that arguments that contain delimiters are passed through correctly.
363       This change also means that all "special" arguments of the form
364       @SMLxxx... must come first.
365    
366    3. Changed install script to put relative anchor names for tool commands
367       into pathconfig.
368    
369    ----------------------------------------------------------------------
370    Name: Matthias Blume
371    >>>>>>> 1.169
372    Date: 2001/09/18 15:35:00 EDT
373    Tag: blume-20010918-readme11036
374    Description:
375    
376    Added README files.
377    
378    ----------------------------------------------------------------------
379    Name: Matthias Blume
380    Date: 2001/09/18 11:45:00 EDT
381    Tag: Release_110_36 (retag)
382    Description:
383    
384    Fixed mistake in config/preloads. Retagged as 110.36.
385    
386    ----------------------------------------------------------------------
387    Name: Matthias Blume
388    Date: 2001/09/18 09:40:00 EDT
389    Tag: Release_110_36_orig (tag changed)
390    Description:
391    
392    New version (110.36).  New bootfiles.
393    
394    ----------------------------------------------------------------------
395    Name: Matthias Blume
396    Date: 2001/09/14 16:15:00 EDT
397    Tag: blume-20010914-x86fastfp
398    Description:
399    
400    John committed some changes that Allen made, in particular a (hopefully)
401    correctly working version of the x86-fp module.
402    
403    I changed the default setting of the Control.MLRISC.getFlag "x86-fast-fp"
404    flag to "true".  Everything seems to compile to a fixpoint ok, and
405    "mandelbrot" speeds up by about 15%.
406    
407    ----------------------------------------------------------------------
408    Name: Matthias Blume
409    Date: 2001/09/13 11:20:00 EDT
410    Tag: blume-20010913-minimal
411    Description:
412    
413    1. Stefan Monnier's patch to fix a miscompilation problem that
414       was brought to light by John Reppy's work on Moby.
415    
416    2. Implemented a minimal "structure Compiler" that contains just
417       "version" and "architecture".  The minimal version will be
418       available when the full version is not.  This is for backward-
419       compatibility with code that wants to test Compiler.version.
420    
421    ----------------------------------------------------------------------
422    Name: Matthias Blume
423    Date: 2001/08/28 14:03:00 EDT
424    Tag: blume-20010828-ml-lex
425    Description:
426    
427    Fix for bug 1581, received from Neophytos Michael.
428    
429    ----------------------------------------------------------------------
430    Name: Matthias Blume
431    Date: 2001/08/27 11:20:00 EDT
432    Tag: blume-20010827-readme11035
433    Description:
434    
435    Fleshed out the README file for 110.35.
436    
437    ----------------------------------------------------------------------
438    Name: Matthias Blume
439    Date: 2001/08/24 17:10:00 EDT
440    Tag: Release_110_35
441    Description:
442    
443    New version number (110.35).  New bootfiles.
444    
445    ----------------------------------------------------------------------
446    Name: Lal George
447    Date: 2001/08/24 13:47:18 EDT 2001
448    Tag: george-20010824-MLRISC-graphs
449    Description:
450    
451     removed clusters from MLRISC completely and replaced with graphs.
452    
453    ----------------------------------------------------------------------
454    Name: Matthias Blume
455    Date: 2001/08/23 17:50:00 EDT
456    Tag: blume-20010823-toplevel
457    Description:
458    
459    - some reorganization of the code that implements various kinds of
460      environments in the compiler (static, dynamic, symbolic, combined)
461    - re-implemented the EnvRef module so that evalStream works properly
462      (if the stream contains references to "use", "CM.make", etc.)
463    - cleaned up evalloop.sml and interact.sml (but they need more cleaning)
464    
465    ----------------------------------------------------------------------
466    Name: Matthias Blume
467    Date: 2001/08/20 15:50 EDT
468    Tag: blume20010820-slipup
469    Description:
470    
471    I forgot to commit a few files.  Here they are...
472    
473    ----------------------------------------------------------------------
474    Name: Matthias Blume
475    Date: 2001/08/20 15:35:00 EDT
476    Tag: blume-20010820-debugprof
477    Description:
478    
479    !!!! NEW BOOTFILES !!!!
480    
481    This is another round of reorganizing the compiler sources.  This
482    time the main goal was to factor out all the "instrumentation"
483    passes (for profiling and backtracing) into their own library.
484    The difficulty was to do it in such a way that it does not depend
485    on elaborate.cm but only on elabdata.cm.
486    
487    Therefore there have been further changes to both elaborate.cm and
488    elabdata.cm -- more "generic" things have been moved from the former
489    to the latter.  As a result, I was forced to split the assignment
490    of numbers indicating "primtyc"s into two portions: SML-generic and
491    SML/NJ-specific.  Since it would have been awkward to maintain,
492    I bit the bullet and actually _changed_ the mapping between these
493    numbers and primtycs.  The bottom line of this is that you need
494    a new set of bin- and bootfiles.
495    
496    I have built new bootfiles for all architectures, so doing a fresh
497    checkout and config/install.sh should be all you need.
498    
499    The newly created library's name is
500    
501        $smlnj/viscomp/debugprof.cm
502    
503    and its sources live under
504    
505        src/compiler/DebugProf
506    
507    ----------------------------------------------------------------------
508    Name: Matthias Blume
509    Date: 2001/08/15 17:15:00 EDT
510    Tag: blume-20010815-compreorg
511    Description:
512    
513    This is a first cut at reorganizing the CM libraries that make up the
514    core of the compiler.  The idea is to separate out pieces that could
515    be used independently by tools, e.g., the parser, the typechecker, etc.
516    
517    The current status is a step in this direction, but it is not quite
518    satisfactory yet.  Expect more changes in the future.
519    
520    Here is the current (new) organization...
521    
522        What used to be $smlnj/viscomp/core.cm is now divided into
523        six CM libraries:
524    
525             $smlnj/viscomp/basics.cm
526                           /parser.cm
527                           /elabdata.cm
528                           /elaborate.cm
529                           /execute.cm
530                           /core.cm
531    
532        The CM files for these libraries live under src/system/smlnj/viscomp.
533        All these libraries are proxy libraries that contain precisely
534        one CM library component.  Here are the locations of the components
535        (all within the src/compiler tree):
536    
537             Basics/basics.cm
538             Parse/parser.cm
539             ElabData/elabdata.cm
540             Elaborator/elaborate.cm
541             Execution/execute.cm
542             core.cm
543    
544         [This organization is the same that has been used already
545         for a while for the architecture-specific parts of the visible
546         compiler and for the old version of core.cm.]
547    
548         As you will notice, many source files have been moved from their
549         respective original locations to a new home in one of the above
550         subtrees.
551    
552         The division of labor between the new libraries is the following:
553    
554             basics.cm:
555                - Simple, basic definitions that pertain to many (or all) of
556                  the other libraries.
557             parser.cm:
558                - The SML parser, producing output of type Ast.dec.
559                - The type family for Ast is also defined and exported here.
560             elabdata.cm:
561                - The datatypes that describe input and output of the elaborator.
562                  This includes types, absyn, and static environments.
563             elaborator.cm:
564                - The SML/NJ type checker and elaborator.
565                  This maps an Ast.dec (with a given static environment) to
566                  an Absyn.dec (with a new static environment).
567                - This libraries implements certain modules that used to be
568                  structures as functors (to remove dependencies on FLINT).
569             execute.cm:
570                - Everything having to do with executing binary code objects.
571                - Dynamic environments.
572             core.cm:
573                - SML/NJ-specific instantiations of the elaborator and MLRISC.
574                - Top-level modules.
575                - FLINT (this should eventually become its own library)
576    
577    Notes:
578    
579    I am not 100% happy with the way I separated the elaborator (and its
580    data structures) from FLINT.  Two instances of the same problem:
581    
582        1. Data structures contain certain fields that carry FLINT-specific
583           information.  I hacked around this using exn and the property list
584           module from smlnj-lib.  But the fact that there are middle-end
585           specific fields around at all is a bit annoying.
586    
587        2. The elaborator calculates certain FLINT-related information.  I tried
588           to make this as abstract as I could using functorization, but, again,
589           the fact that the elaborator has to perform calculations on behalf
590           of the middle-end at all is not nice.
591    
592        3. Having to used exn and property lists is unfortunate because it
593           weakens type checking.  The other alternative (parameterizing
594           nearly *everything*) is not appealing, though.
595    
596    I removed the "rebinding =" warning hack because due to the new organization
597    it was awkward to maintain it.  As a result, the compiler now issues some of
598    these warnings when compiling init.cmi during bootstrap compilation. On
599    the plus side, you also get a warning when you do, for example:
600       val op = = Int32.+
601    which was not the case up to now.
602    
603    I placed "assign" and "deref" into the _Core structure so that the
604    code that deals with the "lazy" keyword can find them there.  This
605    removes the need for having access to the primitive environment
606    during elaboration.
607    
608    ----------------------------------------------------------------------
609    Name: Matthias Blume
610    Date: 2001/08/13
611    Tag: blume-20010813-closures
612    Description:
613    
614    This fix was sent to us by Zhong Shao.  It is supposed to improve the
615    performance of certain loops by avoiding needless closure allocation.
616    
617    ----------------------------------------------------------------------
618    Name: Lal George
619    Date: 2001/07/31 10:03:23 EDT 2001
620    Tag: george-20010731-x86-fmalloc
621    Description: Fixed bug in x86 calls
622    
623        There was a bug where call instructions would mysteriously
624        vanish. The call instruction had to be one that returned
625        a floating point value.
626    
627    ----------------------------------------------------------------------
628    Name: Lal George
629    Date: 2001/07/19 16:36:29 EDT 2001
630    Tag: george-20010719-simple-cells
631    Description:
632    
633    I have dramatically simplified the interface for CELLS in MLRISC.
634    
635    In summary, the cells interface is broken up into three parts:
636    
637      1. CellsBasis : CELLS_BASIS
638    
639            CellsBasis is a top level structure and common for all
640            architectures.  it contains the definitions of basic datatypes
641            and utility  functions over these types.
642    
643      2. functor Cells() : CELLS
644    
645            Cells generates an interface for CELLS that incorporates the
646            specific resources on the target architecture, such as the
647            presence of special register classes, their number and size,
648            and various useful substructures.
649    
650      3. <ARCH>CELLS
651    
652            e.g. SparcCells: SPARCCELLS
653    
654            <ARCH>CELLS usually contains additional bindings for special
655            registers  on the architecture, such as:
656    
657                    val r0 : cell           (* register zero *)
658                    val y : cell            (* Y register *)
659                    val psr : cell          (* processor status register *)
660                    ...
661    
662            The structure returned by applying the Cells functor is opened
663            in this interface.
664    
665    The main implication of all this is that the datatypes for cells is
666    split between CellsBasis and CELLS -- a fairly simple change for user
667    code.
668    
669    In the old scheme the CELLS interface had a definitional binding of
670    the form:
671    
672            signature CELLS = sig
673    
674               structure CellsBasis = CellsBasis
675    
676               ...
677    
678            end
679    
680    With all the sharing constraints that goes on in MLRISC, this old
681    design  quickly leads to errors such as:
682    
683            "structure definition spec inside of sharing ... "
684    
685    
686    and appears to require an unacceptable amount of sharing and where
687    constraint hackery.
688    
689    I think this error message (the interaction of definitional specs and
690    sharing) requires more explanation on our web page.
691    
692    ----------------------------------------------------------------------
693    Name: Matthias Blume
694    Date: 2001/07/19 15:00:00 EDT
695    Tag: blume-20010719-libreorg
696    Description:
697    
698    This update puts together a fairly extensive but straightforward change
699    to the way the libraries that implement the interactive system are
700    organized:
701    
702       The biggest change is the elimination of structure Compiler.  As a
703       replacement for this structure, there is now a CM library
704       (known as $smlnj/compiler.cm or $smlnj/compiler/current.cm)
705       that exports all the substructures of the original structure Compiler
706       directly.  So instead of saying Compiler.Foo.bar one now simply
707       says Foo.bar.  (The CM libraries actually export a collection of
708       structures that is richer than the collection of substructures of
709       structure Compiler.)
710    
711       To make the transition smooth, there is a separate library called
712       $smlnj/compiler/compiler.cm which puts together and exports the
713       original structure Compiler (or at least something very close to it).
714    
715       There are five members of the original structure Compiler
716       that are not exported directly but which instead became members
717       of a new structure Backend (described by signature BACKEND).  These are:
718       structure Profile (: PROFILE), structure Compile (: COMPILE), structure
719       Interact (: INTERACT), structure Machine (: MACHINE), and val
720       architecture (: string).
721    
722       Structure Compiler.Version has become structure CompilerVersion.
723    
724       Cross-compilers for alpha32, hppa, ppc, sparc, and x86 are provided
725       by $smlnj/compiler/<arch>.cm where <arch> is alpha32, hppa, ppc, sparc,
726       or x86, respectively.
727       Each of these exports the same frontend structures that
728       $smlnj/compiler.cm exports.  But they do not have a structure Backend
729       and instead export some structure <Arch>Backend where <Arch> is Alpha32,
730       Hppa, PPC, Sparc, or X86, respectively.
731    
732       Library $smlnj/compiler/all.cm exports the union of the exports of
733       $smlnj/compiler/<arch>.cm
734    
735       There are no structures <Arch>Compiler anymore, use
736       $smlnj/compiler/<arch>.cm instead.
737    
738       Library host-compiler-0.cm is gone.  Instead, the internal library
739       that instantiates CM is now called cm0.cm.  Selection of the host
740       compiler (backend) is no longer done here but. (Responsibility for it
741       now lies with $smlnj/compiler/current.cm.  This seems to be more
742       logical.)
743    
744       Many individual files have been moved or renamed.  Some files have
745       been split into multiple files, and some "dead" files have been deleted.
746    
747    Aside from these changes to library organization, there are also changes
748    to the way the code itself is organized:
749    
750       Structure Binfile has been re-implemented in such a way that it no
751       longer needs any knowledge of the compiler.  It exclusively deals
752       with the details of binfile layout.  It no longer invokes the
753       compiler (for the purpose of creating new prospective binfile
754       content), and it no longer has any knowledge of how to interpret
755       pickles.
756    
757       Structure Compile (: COMPILE) has been stripped down to the bare
758       essentials of compilation.  It no longer deals with linking/execution.
759       The interface has been cleaned up considerably.
760    
761       Utility routines for dealing with linking and execution have been
762       moved into their own substructures.
763    
764       (The ultimate goal of these changes is to provide a light-weight
765       binfile loader/linker (at least for, e.g., stable libraries) that
766       does not require CM or the compiler to be present.)
767    
768    CM documentation has been updated to reflect the changes to library
769    organization.
770    
771    ----------------------------------------------------------------------
772    Name: Matthias Blume
773    Date: 2001/07/10 17:30:00 EDT
774    Tag: Release_110_34
775    Description:
776    
777    Minor tweak to 110.34 (re-tagged):
778    
779      - README.html file added to CVS repository
780      - runtime compiles properly under FreeBSD 3.X and 4.X
781    
782    ----------------------------------------------------------------------
783    Name: Matthias Blume
784    Date: 2001/07/10 17:30:00 EDT
785    Tag: Release_110_34
786    Description:
787    
788    New version number (110.34). New bootfiles.
789    
790    ----------------------------------------------------------------------
791    Name: Matthias Blume
792    Date: 2001/07/09 16:00:00 EDT
793    Tag: blume-20010709-more-varargs
794    Description:
795    
796    I changed the handling of varargs in ml-nlffigen again:
797    The ellipsis ... will now simply be ignored (with an accompanying warning).
798    
799    The immediate effect is that you can actually call a varargs function
800    from ML -- but you can't actually supply any arguments beyond the ones
801    specified explicitly.  (For example, you can call printf with its format
802    string, but you cannot pass additional arguments.)
803    
804    This behavior is only marginally more useful than the one before, but
805    it has the advantage that a function or, more importantly, a function
806    type never gets dropped on the floor, thus avoiding follow-up problems with
807    other types that refer to the offending one.
808    
809    ----------------------------------------------------------------------
810    Name: Matthias Blume
811    Date: 2001/07/09 11:25:00 EDT
812    Tag: blume-20010709-varargs
813    Description:
814    
815    1. ckit-lib.cm now exports structure Error
816    2. ml-nlffigen reports occurences of "..." (i.e., varargs function types)
817       with a warning accompanied by a source location.  Moreover, it
818       merely skips the offending function or type and proceeds with the
819       rest of its work.u  As a result, one can safely feed C code containing
820       "..." to ml-nlffigen.
821    3. There are some internal improvements to CM, providing slightly
822       more general string substitutions in the tools subsystem.
823    
824    ----------------------------------------------------------------------
825    Name: Matthias Blume
826    Date: 2001/06/27 15:10:00 EDT
827    Tag: blume-20010627-concur
828    Description:
829    
830    Fixed a small bug in CM's handling of parallel compilation.
831    (You could observe the bug by Control-C-interrupting an ordinary
832    CMB.make or CM.stabilize and then attaching some compile servers.
833    The result was that all of a sudden the previously interrupted
834    compilation would continue on its own.  This was because of
835    an over-optimization: CM did not bother to clean out certain queues
836    when no servers were attached "anyway", resulting in the contents
837    of these queues to grab control when new servers did get attached.)
838    
839    There is also another minor update to the CM manual.
840    
841    ----------------------------------------------------------------------
842    Name: Matthias Blume
843    Date: 2001/06/26 16:15:00 EDT
844    Tag: blume-20010626-cmdoc
845    Description:
846    
847    Minor typo fixed in CM manual (syntax diagram for libraries).
848    
849    ----------------------------------------------------------------------
850    Name: Matthias Blume
851    Date: 2001/06/25 22:55:00 EDT
852    Tag: blume-20010625-x86pc
853    Description:
854    
855    Fixed a nasty bug in the X86 assembly code that caused signal
856    handlers to fail (crash) randomly.
857    
858    ----------------------------------------------------------------------
859    Name: Matthias Blume
860    Date: 2001/06/25 12:05:00 EDT
861    Tag: blume-20010625-nlffigen
862    Description:
863    
864    This update fixes a number of minor bugs in ml-nlffigen as reported by
865    Nick Carter <nbc@andrew.cmu.edu>.
866    
867      1. Silly but ok typedefs of the form "typedef void myvoid;" are now accepted.
868      2. Default names for generated files are now derived from the name of
869         the C file *without its directory*.  In particular, this causes generated
870         files to be placed locally even if the C file is in some system directory.
871      3. Default names for generated signatures and structures are also derived
872         from the C file name without its directory.  This avoids silly things
873         like "structure GL/GL".
874         (Other silly names are still possible because ml-nlffigen does not do
875          a thorough check of whether generated names are legal ML identifiers.
876          When in doubt, use command line arguments to force particular names.)
877    
878    ----------------------------------------------------------------------
879    Name: Matthias Blume
880    Date: 2001/06/21 12:25:00 EDT
881    Tag: blume-20010621-eXene
882    Description:
883    
884    eXene now compiles and (sort of) works again.
885    
886    The library name (for version > 110.33) is $/eXene.cm.
887    
888    I also added an new example in src/eXene/examples/nbody.  See the
889    README file there for details.
890    
891    ----------------------------------------------------------------------
892    Name: Matthias Blume
893    Date: 2001/06/20 16:40:00 EDT
894    Tag: blume-20010620-cml
895    Description:
896    
897    CML now compiles and works again.
898    
899    Libraries (for version > 110.33):
900    
901      $cml/cml.cm            Main CML library.
902      $cml/basis.cm          CML's version of $/basis.cm.
903      $cml/cml-internal.cm   Internal helper library.
904      $cml/core-cml.cm       Internal helper library.
905      $cml-lib/trace-cml.cm  Tracing facility.
906      $cml-lib/smlnj-lib.cm  CML's version of $/smlnj-lib.cm
907    
908    The installer (config/install.sh) has been taught how to properly
909    install this stuff.
910    
911    ----------------------------------------------------------------------
912    Name: Matthias Blume
913    Date: 2001/06/19 17:55:00 EDT
914    Tag: blume-20010619-instantiate
915    Description:
916    
917    This un-breaks the fix for bug 1432.
918    (The bug was originally fixed in 110.9 but I broke it again some
919    time after that.)
920    
921    ----------------------------------------------------------------------
922    Name: Matthias Blume
923    Date: 2001/06/19 17:25:00 EDT
924    Tag: blume-20010619-signals
925    Description:
926    
927    This should (hopefully) fix the long-standing signal handling bug.
928    (The runtime system was constructing a continuation record with an
929    incorrect descriptor which would cause the GC to drop data on the floor...)
930    
931    ----------------------------------------------------------------------
932    Name: Matthias Blume
933    Date: 2001/06/15 15:05:00 EDT
934    Tag: blume-20010615-moresparc
935    Description:
936    
937    Here is a short late-hour update related to Sparc c-calls:
938    
939     -- made handling of double-word arguments a bit smarter
940    
941     -- instruction selection phase tries to collapse certain clumsily
942        constructed ML-Trees; typical example:
943    
944            ADD(ty,ADD(_,e,LI d1),LI d2)  ->  ADD(ty,e,LI(d1+d2))
945    
946        This currently has no further impact on SML/NJ since mlriscGen does
947        not seem to generate such patterns in the first place, and c-calls
948        (which did generate them in the beginning) has meanwhile been fixed
949        so as to avoid them as well.
950    
951  ----------------------------------------------------------------------  ----------------------------------------------------------------------
952  Name: Matthias Blume  Name: Matthias Blume
# Line 2409  Line 3345 
3345       elaborator). There were a lot of changes during my "linkpath" trials       elaborator). There were a lot of changes during my "linkpath" trials
3346       that could have been reverted to their original state but weren't.       that could have been reverted to their original state but weren't.
3347       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
3348       than what was strictly necessary...  (I _did_ resist the tempation       than what was strictly necessary...  (I _did_ resist the temptation
3349       of doing any "global reformatting" to avoid an untimely death at       of doing any "global reformatting" to avoid an untimely death at
3350       Dave's hands. :)       Dave's hands. :)
3351    

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