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revision 839, Thu Jun 7 20:28:44 2001 UTC revision 1016, Tue Jan 15 23:10:06 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: Lal George
16    Date: 2002/01/15
17    Tag: <none>
18    Description:
19    
20    1. Since COPY instructions are no longer native to the architecture,
21       a generic functor can be used to implement the expandCopies function.
22    
23    2. Allowed EXPORT and IMPORT pseudo-op declarations to appear inside a
24       TEXT segment.
25    
26    ----------------------------------------------------------------------
27    Name: Matthias Blume
28    Date: 2002/01/15
29    Tag: blume-20020115-ffiupdates
30    Description:
31    
32    1. Fix for bug resulting in single-precision float values being returned
33       incorrectly from FFI calls.
34    
35    2. Small modifications to C FFI API:
36    
37        - memory-allocation routines return straight objects (no options)
38          and raise an exception in out-of-memory situations
39        - unsafe extensions to cast between function pointers and pointers
40          from/to ints
41        - added structure C_Debug as an alternative to structure C where
42          pointer-dereferencing (|*| and |*!) always check for null-pointers
43        - added open_lib' to DynLinkage;  open_lib' works like open_lib
44          but also takes a (possibly empty) list of existing library handles
45          that the current library depends on
46    
47    ----------------------------------------------------------------------
48    Name: Matthias Blume
49    Date: 2002/01/10
50    Tag: blume-20020110-newffigen
51    Description:
52    
53    1. Updates to portable graph code.
54    
55    2. Major update to ml-nlffigen and ml-nlffi-lib.  Things are much
56       more scalable now so that even huge interfaces such as the one
57       for GTK compile in finite time and space. :-)
58       See src/ml-nlffigen/README for details on what's new.
59    
60    ----------------------------------------------------------------------
61    Name: Lal George
62    Date: 2001/01/09 14:31:35 EST 2002
63    Tag: george-20011206-rm-native-copy
64    Description:
65    
66            Removed the native COPY and FCOPY instructions
67            from all the architectures and replaced it with the
68            explicit COPY instruction from the previous commit.
69    
70            It is now possible to simplify many of the optimizations
71            modules that manipulate copies. This has not been
72            done in this change.
73    
74    ----------------------------------------------------------------------
75    Name: Lal George
76    Date: 2001/12/06 16:50:13 EST 2001
77    Tag: george-20011206-mlrisc-instruction
78    Description:
79    
80    Changed the representation of instructions from being fully abstract
81    to being partially concrete. That is to say:
82    
83      from
84            type instruction
85    
86      to
87            type instr                              (* machine instruction *)
88    
89            datatype instruction =
90                LIVE of {regs: C.cellset, spilled: C.cellset}
91              | KILL of {regs: C.cellset, spilled: C.cellset}
92              | COPYXXX of {k: CB.cellkind, dst: CB.cell list, src: CB.cell list}
93              | ANNOTATION of {i: instruction, a: Annotations.annotation}
94              | INSTR of instr
95    
96    This makes the handling of certain special instructions that appear on
97    all architectures easier and uniform.
98    
99    LIVE and KILL say that a list of registers are live or killed at the
100    program point where they appear. No spill code is generated when an
101    element of the 'regs' field is spilled, but the register is moved to
102    the 'spilled' (which is present, more for debugging than anything else).
103    
104    LIVE replaces the (now deprecated) DEFFREG instruction on the alpha.
105    We used to generate:
106    
107            DEFFREG f1
108            f1 := f2 + f3
109            trapb
110    
111    but now generate:
112    
113            f1 := f2 + f3
114            trapb
115            LIVE {regs=[f1,f2,f3], spilled=[]}
116    
117    Furthermore, the DEFFREG (hack) required that all floating point instruction
118    use all registers mentioned in the instruction. Therefore f1 := f2 + f3,
119    defines f1 and uses [f1,f2,f3]! This hack is no longer required resulting
120    in a cleaner alpha implementation. (Hopefully, intel will not get rid of
121    this architecture).
122    
123    COPYXXX is intended to replace the parallel COPY and FCOPY  available on
124    all the architectures. This will result in further simplification of the
125    register allocator that must be aware of them for coalescing purposes, and
126    will also simplify certain aspects of the machine description that provides
127    callbacks related to parallel copies.
128    
129    ANNOTATION should be obvious, and now INSTR represents the honest to God
130    machine instruction set!
131    
132    The <arch>/instructions/<arch>Instr.sml files define certain utility
133    functions for making porting easier -- essentially converting upper case
134    to lower case. All machine instructions (of type instr) are in upper case,
135    and the lower case form generates an MLRISC instruction. For example on
136    the alpha we have:
137    
138      datatype instr =
139         LDA of {r:cell, b:cell, d:operand}
140       | ...
141    
142      val lda : {r:cell, b:cell, d:operand} -> instruction
143        ...
144    
145    where lda is just (INSTR o LDA), etc.
146    
147    ----------------------------------------------------------------------
148    Name: Matthias Blume
149    Date: 2001/11/22 21:40:00 EST
150    Tag: Release_110_37
151    Description:
152    
153    Release 110.37.  This time for real.
154    
155    ----------------------------------------------------------------------
156    Name: Matthias Blume
157    Date: 2001/11/21 16:35:00 EST
158    Tag: blume-20011121-foot-in-mouth
159    Description:
160    
161    Removed the "Release_110_37" tag because of a serious bug.
162    This will be re-tagged once the bug is fixed.
163    
164    ----------------------------------------------------------------------
165    Name: Matthias Blume
166    Date: 2001/11/21 16:14:00 EST
167    Tag: blume-20011121-forgottenfile
168    Description:
169    
170    Forgot to add a file.  (Just a .tex-file -- part of
171    the CM manual source.)
172    
173    ----------------------------------------------------------------------
174    Name: Matthias Blume
175    Date: 2001/11/21 16:10:00 EST
176    Tag: blume-20011121-invalid_110_37
177    Description:
178    
179    Note: I removed the original tag "Release_110_37" from this commit
180          because we found a serious bug in all non-x86 backends.
181          - Matthias
182    
183    1. Modifications to the SML/NJ code generator and to the runtime system
184       so that code object name strings are directly inserted into code
185       objects at code generation time.  The only business the runtime system
186       has with this is now to read the name strings on occasions.
187       (The encoding of the name string has also changed somewhat.)
188    
189    2. CM now implements a simple "set calculus" for specifying export lists.
190       In particular, it is now possible to refer to the export lists of
191       other libraries/groups/sources and form unions as well as differences.
192       See the latest CM manual for details.
193    
194    3. An separate notion of "proxy" libraries has again be eliminated from
195       CM's model.  (Proxy libraries are now simply a special case of using
196       the export list calculus.)
197    
198    4. Some of the existing libraries now take advantage of the new set
199       calculus.
200       (Notice that not all libraries have been converted because some
201       of the existing .cm-files are supposed to be backward compatible
202       with 110.0.x.)
203    
204    5. Some cleanup in stand-alone programs.  (Don't use "exnMessage" -- use
205       "General.exnMessage"!  The former relies on a certain hook to be
206       initialized, and that often does not happen in the stand-alone case.)
207    
208    ----------------------------------------------------------------------
209    Name: Lal George
210    Date: 2001/11/21  13:56:18 EST
211    Tag: george-2001121-pseudo-ops
212    Description:
213    
214      Implemented a complete redesign of MLRISC pseudo-ops. Now there
215      ought to never be any question of incompatabilities with
216      pseudo-op syntax expected by host assemblers.
217    
218      For now, only modules supporting GAS syntax are implemented
219      but more should follow, such as MASM, and vendor assembler
220      syntax, e.g. IBM as, Sun as, etc.
221    
222    ----------------------------------------------------------------------
223    Name: Matthias Blume
224    Date: 2001/11/14 11:52:00 EST
225    Tag: blume-20011114-srcname
226    Description:
227    
228    1. Routed the name of the current source file to mlriscgen where it
229       should be directly emitted into the code object.  (This last part
230       is yet to be done.)
231    
232    2. Some cleanup of the pgraph code to make it match the proposal that
233       I put out the other day.  (The proposal notwithstanding, things are
234       still in flux here.)
235    
236    ----------------------------------------------------------------------
237    Name: Lal George
238    Date: 2001/11/14 09:44:04 EST
239    Tag:
240    Description:
241    
242      Fix for a backpatching bug reported by Allen.
243    
244      Because the boundary between short and long span-dependent
245      instructions is +/- 128, there are an astounding number of
246      span-dependent instructions whose size is over estimated.
247    
248      Allen came up with the idea of letting the size of span
249      dependent instructions be non-monotonic, for a maxIter
250      number of times, after which the size must be monotonically
251      increasing.
252    
253      This table shows the number of span-dependent instructions
254      whose size was over-estimated as a function of maxIter, for the
255      file Parse/parse/ml.grm.sml:
256    
257         maxIter            # of instructions:
258            10                      687
259            20                      438
260            30                      198
261            40                        0
262    
263      In compiling the compiler, there is no significant difference in
264      compilation speed between maxIter=10 and maxIter=40. Actually,
265      my measurements showed that maxIter=40 was a tad faster than
266      maxIter=10! Also 96% of the  files in the compiler reach a fix
267      point within 13 iterations, so fixing maxIter at 40, while high,
268      is okay.
269    
270    ----------------------------------------------------------------------
271    Name: Matthias Blume
272    Date: 2001/10/31 15:25:00 EST
273    Tag: blume-20011031-pgraph
274    Description:
275    
276    CKIT:
277    * Changed the "Function" constructor of type Ast.ctype to carry optional
278      argument identifiers.
279    * Changed the return type of TypeUtil.getFunction accordingly.
280    * Type equality ignores the argument names.
281    * TypeUtil.composite tries to preserve argument names but gives up quickly
282      if there is a mismatch.
283    
284    installation script:
285    * attempts to use "curl" if available (unless "wget" is available as well)
286    
287    CM:
288    * has an experimental implementation of "portable graphs" which I will
289      soon propose as an implementation-independent library format
290    * there are also new libraries $/pgraph.cm and $/pgraph-util.cm
291    
292    NLFFI-LIB:
293    * some cleanup (all cosmetic)
294    
295    NLFFIGEN:
296    * temporarily disabled the mechanism that suppresses ML output for
297      C definitions whose identifiers start with an underscore character
298    * generate val bindings for enum constants
299    * user can request that only one style (light or heavy) is being used;
300      default is to use both (command-line arguments: -heavy and -light)
301    * fixed bug in handling of function types involving incomplete pointers
302    * generate ML entry points that take record arguments (i.e., using
303      named arguments) for C functions that have a prototype with named
304      arguments
305      (see changes to CKIT)
306    
307    ----------------------------------------------------------------------
308    Name: Allen Leung
309    Date: 2001/10/27 20:34:00 EDT
310    Tag: leunga-20011027-x86-fast-fp-call
311    Description:
312    
313       Fixed the bug described in blume-20010920-slowfp.
314    
315       The fix involves
316          1. generating FCOPYs in FSTP in ia32-svid
317          2. marking a CALL with the appropriate annotation
318    
319    ----------------------------------------------------------------------
320    Name: Matthias Blume
321    Date: 2001/10/16 11:32:00 EDT
322    Tag: blume-20011016-netbsd
323    Description:
324    
325    Underscore patch from Chris Richards (fixing problem with compiling
326    runtime system under recent NetBSD).
327    
328    ----------------------------------------------------------------------
329    Name: Allen Leung
330    Date: 2001/10/12 17:18:32 EDT 2001
331    Tag: leung-20011012-x86-printflowgraph
332    Description:
333    
334    X86RA now uses a valid (instead of dummy) PrintFlowgraph module.
335    
336    ----------------------------------------------------------------------
337    Name: Lal George
338    Date: 2001/10/11 23:51:34 EDT
339    Tag: george-20011011-too-many-instrs
340    Description:
341    
342    The representation of a program point never expected to see more
343    than 65536 instructions in a basic block!
344    
345    ----------------------------------------------------------------------
346    Name: Lal George
347    Date: 2001/10/09 09:41:37 EDT
348    Tag: george-20011008-mlrisc-labels
349    Description:
350    
351    Changed the machine description files to support printing of
352    local and global labels in assembly code, based on host assembler
353    conventions.
354    
355    ----------------------------------------------------------------------
356    Name: Matthias Blume
357    Date: 2001/09/25 15:25:00 EDT
358    Tag: blume-20010925-exninfo
359    Description:
360    
361    I provided a non-hook implementation of exnName (at the toplevel) and
362    made the "dummy" implementation of exnMessage (at the toplevel) more
363    useful: if nothing gets "hooked in", then at least you are going to
364    see the exception name and a message indicating why you don't see more.
365    
366    [For the time being, programs that need exnMessage and want to use
367    ml-build should either use General.exnMessage (strongly recommended) or
368    refer to structure General at some other point so that CM sees a
369    static dependency.]
370    
371    [Similar remarks go for "print" and "use":  If you want to use their
372    functionality in stand-alone programs generated by ml-build, then use
373    TextIO.output and Backend.Interact.useFile (from $smlnj/compiler.cm).]
374    
375    ----------------------------------------------------------------------
376    Name: Matthias Blume
377    Date: 2001/09/20 17:28:00 EDT
378    Tag: blume-20010920-slowfp
379    Description:
380    
381    Allen says that x86-fast-fp is not safe yet, so I turned it off again...
382    
383    ----------------------------------------------------------------------
384    Name: Matthias Blume
385    Date: 2001/09/20 17:20:00 EDT
386    Tag: blume-20010920-canonicalpaths
387    Description:
388    
389    0. Updated the BOOT file (something that I forgot to do earlier).
390    
391    1. Small internal change to CM so that it avoids "/../" in filenames
392       as much as possible (but only where it is safe).
393    
394    2. Changed config/_run-sml (resulting in a changed bin/.run-sml) so
395       that arguments that contain delimiters are passed through correctly.
396       This change also means that all "special" arguments of the form
397       @SMLxxx... must come first.
398    
399    3. Changed install script to put relative anchor names for tool commands
400       into pathconfig.
401    
402    ----------------------------------------------------------------------
403    Name: Matthias Blume
404    >>>>>>> 1.169
405    Date: 2001/09/18 15:35:00 EDT
406    Tag: blume-20010918-readme11036
407    Description:
408    
409    Added README files.
410    
411    ----------------------------------------------------------------------
412    Name: Matthias Blume
413    Date: 2001/09/18 11:45:00 EDT
414    Tag: Release_110_36 (retag)
415    Description:
416    
417    Fixed mistake in config/preloads. Retagged as 110.36.
418    
419    ----------------------------------------------------------------------
420    Name: Matthias Blume
421    Date: 2001/09/18 09:40:00 EDT
422    Tag: Release_110_36_orig (tag changed)
423    Description:
424    
425    New version (110.36).  New bootfiles.
426    
427    ----------------------------------------------------------------------
428    Name: Matthias Blume
429    Date: 2001/09/14 16:15:00 EDT
430    Tag: blume-20010914-x86fastfp
431    Description:
432    
433    John committed some changes that Allen made, in particular a (hopefully)
434    correctly working version of the x86-fp module.
435    
436    I changed the default setting of the Control.MLRISC.getFlag "x86-fast-fp"
437    flag to "true".  Everything seems to compile to a fixpoint ok, and
438    "mandelbrot" speeds up by about 15%.
439    
440    ----------------------------------------------------------------------
441    Name: Matthias Blume
442    Date: 2001/09/13 11:20:00 EDT
443    Tag: blume-20010913-minimal
444    Description:
445    
446    1. Stefan Monnier's patch to fix a miscompilation problem that
447       was brought to light by John Reppy's work on Moby.
448    
449    2. Implemented a minimal "structure Compiler" that contains just
450       "version" and "architecture".  The minimal version will be
451       available when the full version is not.  This is for backward-
452       compatibility with code that wants to test Compiler.version.
453    
454    ----------------------------------------------------------------------
455    Name: Matthias Blume
456    Date: 2001/08/28 14:03:00 EDT
457    Tag: blume-20010828-ml-lex
458    Description:
459    
460    Fix for bug 1581, received from Neophytos Michael.
461    
462    ----------------------------------------------------------------------
463    Name: Matthias Blume
464    Date: 2001/08/27 11:20:00 EDT
465    Tag: blume-20010827-readme11035
466    Description:
467    
468    Fleshed out the README file for 110.35.
469    
470    ----------------------------------------------------------------------
471    Name: Matthias Blume
472    Date: 2001/08/24 17:10:00 EDT
473    Tag: Release_110_35
474    Description:
475    
476    New version number (110.35).  New bootfiles.
477    
478    ----------------------------------------------------------------------
479    Name: Lal George
480    Date: 2001/08/24 13:47:18 EDT 2001
481    Tag: george-20010824-MLRISC-graphs
482    Description:
483    
484     removed clusters from MLRISC completely and replaced with graphs.
485    
486    ----------------------------------------------------------------------
487    Name: Matthias Blume
488    Date: 2001/08/23 17:50:00 EDT
489    Tag: blume-20010823-toplevel
490    Description:
491    
492    - some reorganization of the code that implements various kinds of
493      environments in the compiler (static, dynamic, symbolic, combined)
494    - re-implemented the EnvRef module so that evalStream works properly
495      (if the stream contains references to "use", "CM.make", etc.)
496    - cleaned up evalloop.sml and interact.sml (but they need more cleaning)
497    
498    ----------------------------------------------------------------------
499    Name: Matthias Blume
500    Date: 2001/08/20 15:50 EDT
501    Tag: blume20010820-slipup
502    Description:
503    
504    I forgot to commit a few files.  Here they are...
505    
506    ----------------------------------------------------------------------
507    Name: Matthias Blume
508    Date: 2001/08/20 15:35:00 EDT
509    Tag: blume-20010820-debugprof
510    Description:
511    
512    !!!! NEW BOOTFILES !!!!
513    
514    This is another round of reorganizing the compiler sources.  This
515    time the main goal was to factor out all the "instrumentation"
516    passes (for profiling and backtracing) into their own library.
517    The difficulty was to do it in such a way that it does not depend
518    on elaborate.cm but only on elabdata.cm.
519    
520    Therefore there have been further changes to both elaborate.cm and
521    elabdata.cm -- more "generic" things have been moved from the former
522    to the latter.  As a result, I was forced to split the assignment
523    of numbers indicating "primtyc"s into two portions: SML-generic and
524    SML/NJ-specific.  Since it would have been awkward to maintain,
525    I bit the bullet and actually _changed_ the mapping between these
526    numbers and primtycs.  The bottom line of this is that you need
527    a new set of bin- and bootfiles.
528    
529    I have built new bootfiles for all architectures, so doing a fresh
530    checkout and config/install.sh should be all you need.
531    
532    The newly created library's name is
533    
534        $smlnj/viscomp/debugprof.cm
535    
536    and its sources live under
537    
538        src/compiler/DebugProf
539    
540    ----------------------------------------------------------------------
541    Name: Matthias Blume
542    Date: 2001/08/15 17:15:00 EDT
543    Tag: blume-20010815-compreorg
544    Description:
545    
546    This is a first cut at reorganizing the CM libraries that make up the
547    core of the compiler.  The idea is to separate out pieces that could
548    be used independently by tools, e.g., the parser, the typechecker, etc.
549    
550    The current status is a step in this direction, but it is not quite
551    satisfactory yet.  Expect more changes in the future.
552    
553    Here is the current (new) organization...
554    
555        What used to be $smlnj/viscomp/core.cm is now divided into
556        six CM libraries:
557    
558             $smlnj/viscomp/basics.cm
559                           /parser.cm
560                           /elabdata.cm
561                           /elaborate.cm
562                           /execute.cm
563                           /core.cm
564    
565        The CM files for these libraries live under src/system/smlnj/viscomp.
566        All these libraries are proxy libraries that contain precisely
567        one CM library component.  Here are the locations of the components
568        (all within the src/compiler tree):
569    
570             Basics/basics.cm
571             Parse/parser.cm
572             ElabData/elabdata.cm
573             Elaborator/elaborate.cm
574             Execution/execute.cm
575             core.cm
576    
577         [This organization is the same that has been used already
578         for a while for the architecture-specific parts of the visible
579         compiler and for the old version of core.cm.]
580    
581         As you will notice, many source files have been moved from their
582         respective original locations to a new home in one of the above
583         subtrees.
584    
585         The division of labor between the new libraries is the following:
586    
587             basics.cm:
588                - Simple, basic definitions that pertain to many (or all) of
589                  the other libraries.
590             parser.cm:
591                - The SML parser, producing output of type Ast.dec.
592                - The type family for Ast is also defined and exported here.
593             elabdata.cm:
594                - The datatypes that describe input and output of the elaborator.
595                  This includes types, absyn, and static environments.
596             elaborator.cm:
597                - The SML/NJ type checker and elaborator.
598                  This maps an Ast.dec (with a given static environment) to
599                  an Absyn.dec (with a new static environment).
600                - This libraries implements certain modules that used to be
601                  structures as functors (to remove dependencies on FLINT).
602             execute.cm:
603                - Everything having to do with executing binary code objects.
604                - Dynamic environments.
605             core.cm:
606                - SML/NJ-specific instantiations of the elaborator and MLRISC.
607                - Top-level modules.
608                - FLINT (this should eventually become its own library)
609    
610    Notes:
611    
612    I am not 100% happy with the way I separated the elaborator (and its
613    data structures) from FLINT.  Two instances of the same problem:
614    
615        1. Data structures contain certain fields that carry FLINT-specific
616           information.  I hacked around this using exn and the property list
617           module from smlnj-lib.  But the fact that there are middle-end
618           specific fields around at all is a bit annoying.
619    
620        2. The elaborator calculates certain FLINT-related information.  I tried
621           to make this as abstract as I could using functorization, but, again,
622           the fact that the elaborator has to perform calculations on behalf
623           of the middle-end at all is not nice.
624    
625        3. Having to used exn and property lists is unfortunate because it
626           weakens type checking.  The other alternative (parameterizing
627           nearly *everything*) is not appealing, though.
628    
629    I removed the "rebinding =" warning hack because due to the new organization
630    it was awkward to maintain it.  As a result, the compiler now issues some of
631    these warnings when compiling init.cmi during bootstrap compilation. On
632    the plus side, you also get a warning when you do, for example:
633       val op = = Int32.+
634    which was not the case up to now.
635    
636    I placed "assign" and "deref" into the _Core structure so that the
637    code that deals with the "lazy" keyword can find them there.  This
638    removes the need for having access to the primitive environment
639    during elaboration.
640    
641    ----------------------------------------------------------------------
642    Name: Matthias Blume
643    Date: 2001/08/13
644    Tag: blume-20010813-closures
645    Description:
646    
647    This fix was sent to us by Zhong Shao.  It is supposed to improve the
648    performance of certain loops by avoiding needless closure allocation.
649    
650    ----------------------------------------------------------------------
651    Name: Lal George
652    Date: 2001/07/31 10:03:23 EDT 2001
653    Tag: george-20010731-x86-fmalloc
654    Description: Fixed bug in x86 calls
655    
656        There was a bug where call instructions would mysteriously
657        vanish. The call instruction had to be one that returned
658        a floating point value.
659    
660    ----------------------------------------------------------------------
661    Name: Lal George
662    Date: 2001/07/19 16:36:29 EDT 2001
663    Tag: george-20010719-simple-cells
664    Description:
665    
666    I have dramatically simplified the interface for CELLS in MLRISC.
667    
668    In summary, the cells interface is broken up into three parts:
669    
670      1. CellsBasis : CELLS_BASIS
671    
672            CellsBasis is a top level structure and common for all
673            architectures.  it contains the definitions of basic datatypes
674            and utility  functions over these types.
675    
676      2. functor Cells() : CELLS
677    
678            Cells generates an interface for CELLS that incorporates the
679            specific resources on the target architecture, such as the
680            presence of special register classes, their number and size,
681            and various useful substructures.
682    
683      3. <ARCH>CELLS
684    
685            e.g. SparcCells: SPARCCELLS
686    
687            <ARCH>CELLS usually contains additional bindings for special
688            registers  on the architecture, such as:
689    
690                    val r0 : cell           (* register zero *)
691                    val y : cell            (* Y register *)
692                    val psr : cell          (* processor status register *)
693                    ...
694    
695            The structure returned by applying the Cells functor is opened
696            in this interface.
697    
698    The main implication of all this is that the datatypes for cells is
699    split between CellsBasis and CELLS -- a fairly simple change for user
700    code.
701    
702    In the old scheme the CELLS interface had a definitional binding of
703    the form:
704    
705            signature CELLS = sig
706    
707               structure CellsBasis = CellsBasis
708    
709               ...
710    
711            end
712    
713    With all the sharing constraints that goes on in MLRISC, this old
714    design  quickly leads to errors such as:
715    
716            "structure definition spec inside of sharing ... "
717    
718    
719    and appears to require an unacceptable amount of sharing and where
720    constraint hackery.
721    
722    I think this error message (the interaction of definitional specs and
723    sharing) requires more explanation on our web page.
724    
725    ----------------------------------------------------------------------
726    Name: Matthias Blume
727    Date: 2001/07/19 15:00:00 EDT
728    Tag: blume-20010719-libreorg
729    Description:
730    
731    This update puts together a fairly extensive but straightforward change
732    to the way the libraries that implement the interactive system are
733    organized:
734    
735       The biggest change is the elimination of structure Compiler.  As a
736       replacement for this structure, there is now a CM library
737       (known as $smlnj/compiler.cm or $smlnj/compiler/current.cm)
738       that exports all the substructures of the original structure Compiler
739       directly.  So instead of saying Compiler.Foo.bar one now simply
740       says Foo.bar.  (The CM libraries actually export a collection of
741       structures that is richer than the collection of substructures of
742       structure Compiler.)
743    
744       To make the transition smooth, there is a separate library called
745       $smlnj/compiler/compiler.cm which puts together and exports the
746       original structure Compiler (or at least something very close to it).
747    
748       There are five members of the original structure Compiler
749       that are not exported directly but which instead became members
750       of a new structure Backend (described by signature BACKEND).  These are:
751       structure Profile (: PROFILE), structure Compile (: COMPILE), structure
752       Interact (: INTERACT), structure Machine (: MACHINE), and val
753       architecture (: string).
754    
755       Structure Compiler.Version has become structure CompilerVersion.
756    
757       Cross-compilers for alpha32, hppa, ppc, sparc, and x86 are provided
758       by $smlnj/compiler/<arch>.cm where <arch> is alpha32, hppa, ppc, sparc,
759       or x86, respectively.
760       Each of these exports the same frontend structures that
761       $smlnj/compiler.cm exports.  But they do not have a structure Backend
762       and instead export some structure <Arch>Backend where <Arch> is Alpha32,
763       Hppa, PPC, Sparc, or X86, respectively.
764    
765       Library $smlnj/compiler/all.cm exports the union of the exports of
766       $smlnj/compiler/<arch>.cm
767    
768       There are no structures <Arch>Compiler anymore, use
769       $smlnj/compiler/<arch>.cm instead.
770    
771       Library host-compiler-0.cm is gone.  Instead, the internal library
772       that instantiates CM is now called cm0.cm.  Selection of the host
773       compiler (backend) is no longer done here but. (Responsibility for it
774       now lies with $smlnj/compiler/current.cm.  This seems to be more
775       logical.)
776    
777       Many individual files have been moved or renamed.  Some files have
778       been split into multiple files, and some "dead" files have been deleted.
779    
780    Aside from these changes to library organization, there are also changes
781    to the way the code itself is organized:
782    
783       Structure Binfile has been re-implemented in such a way that it no
784       longer needs any knowledge of the compiler.  It exclusively deals
785       with the details of binfile layout.  It no longer invokes the
786       compiler (for the purpose of creating new prospective binfile
787       content), and it no longer has any knowledge of how to interpret
788       pickles.
789    
790       Structure Compile (: COMPILE) has been stripped down to the bare
791       essentials of compilation.  It no longer deals with linking/execution.
792       The interface has been cleaned up considerably.
793    
794       Utility routines for dealing with linking and execution have been
795       moved into their own substructures.
796    
797       (The ultimate goal of these changes is to provide a light-weight
798       binfile loader/linker (at least for, e.g., stable libraries) that
799       does not require CM or the compiler to be present.)
800    
801    CM documentation has been updated to reflect the changes to library
802    organization.
803    
804    ----------------------------------------------------------------------
805    Name: Matthias Blume
806    Date: 2001/07/10 17:30:00 EDT
807    Tag: Release_110_34
808    Description:
809    
810    Minor tweak to 110.34 (re-tagged):
811    
812      - README.html file added to CVS repository
813      - runtime compiles properly under FreeBSD 3.X and 4.X
814    
815    ----------------------------------------------------------------------
816    Name: Matthias Blume
817    Date: 2001/07/10 17:30:00 EDT
818    Tag: Release_110_34
819    Description:
820    
821    New version number (110.34). New bootfiles.
822    
823    ----------------------------------------------------------------------
824    Name: Matthias Blume
825    Date: 2001/07/09 16:00:00 EDT
826    Tag: blume-20010709-more-varargs
827    Description:
828    
829    I changed the handling of varargs in ml-nlffigen again:
830    The ellipsis ... will now simply be ignored (with an accompanying warning).
831    
832    The immediate effect is that you can actually call a varargs function
833    from ML -- but you can't actually supply any arguments beyond the ones
834    specified explicitly.  (For example, you can call printf with its format
835    string, but you cannot pass additional arguments.)
836    
837    This behavior is only marginally more useful than the one before, but
838    it has the advantage that a function or, more importantly, a function
839    type never gets dropped on the floor, thus avoiding follow-up problems with
840    other types that refer to the offending one.
841    
842    ----------------------------------------------------------------------
843    Name: Matthias Blume
844    Date: 2001/07/09 11:25:00 EDT
845    Tag: blume-20010709-varargs
846    Description:
847    
848    1. ckit-lib.cm now exports structure Error
849    2. ml-nlffigen reports occurences of "..." (i.e., varargs function types)
850       with a warning accompanied by a source location.  Moreover, it
851       merely skips the offending function or type and proceeds with the
852       rest of its work.u  As a result, one can safely feed C code containing
853       "..." to ml-nlffigen.
854    3. There are some internal improvements to CM, providing slightly
855       more general string substitutions in the tools subsystem.
856    
857    ----------------------------------------------------------------------
858    Name: Matthias Blume
859    Date: 2001/06/27 15:10:00 EDT
860    Tag: blume-20010627-concur
861    Description:
862    
863    Fixed a small bug in CM's handling of parallel compilation.
864    (You could observe the bug by Control-C-interrupting an ordinary
865    CMB.make or CM.stabilize and then attaching some compile servers.
866    The result was that all of a sudden the previously interrupted
867    compilation would continue on its own.  This was because of
868    an over-optimization: CM did not bother to clean out certain queues
869    when no servers were attached "anyway", resulting in the contents
870    of these queues to grab control when new servers did get attached.)
871    
872    There is also another minor update to the CM manual.
873    
874    ----------------------------------------------------------------------
875    Name: Matthias Blume
876    Date: 2001/06/26 16:15:00 EDT
877    Tag: blume-20010626-cmdoc
878    Description:
879    
880    Minor typo fixed in CM manual (syntax diagram for libraries).
881    
882    ----------------------------------------------------------------------
883    Name: Matthias Blume
884    Date: 2001/06/25 22:55:00 EDT
885    Tag: blume-20010625-x86pc
886    Description:
887    
888    Fixed a nasty bug in the X86 assembly code that caused signal
889    handlers to fail (crash) randomly.
890    
891    ----------------------------------------------------------------------
892    Name: Matthias Blume
893    Date: 2001/06/25 12:05:00 EDT
894    Tag: blume-20010625-nlffigen
895    Description:
896    
897    This update fixes a number of minor bugs in ml-nlffigen as reported by
898    Nick Carter <nbc@andrew.cmu.edu>.
899    
900      1. Silly but ok typedefs of the form "typedef void myvoid;" are now accepted.
901      2. Default names for generated files are now derived from the name of
902         the C file *without its directory*.  In particular, this causes generated
903         files to be placed locally even if the C file is in some system directory.
904      3. Default names for generated signatures and structures are also derived
905         from the C file name without its directory.  This avoids silly things
906         like "structure GL/GL".
907         (Other silly names are still possible because ml-nlffigen does not do
908          a thorough check of whether generated names are legal ML identifiers.
909          When in doubt, use command line arguments to force particular names.)
910    
911    ----------------------------------------------------------------------
912    Name: Matthias Blume
913    Date: 2001/06/21 12:25:00 EDT
914    Tag: blume-20010621-eXene
915    Description:
916    
917    eXene now compiles and (sort of) works again.
918    
919    The library name (for version > 110.33) is $/eXene.cm.
920    
921    I also added an new example in src/eXene/examples/nbody.  See the
922    README file there for details.
923    
924    ----------------------------------------------------------------------
925    Name: Matthias Blume
926    Date: 2001/06/20 16:40:00 EDT
927    Tag: blume-20010620-cml
928    Description:
929    
930    CML now compiles and works again.
931    
932    Libraries (for version > 110.33):
933    
934      $cml/cml.cm            Main CML library.
935      $cml/basis.cm          CML's version of $/basis.cm.
936      $cml/cml-internal.cm   Internal helper library.
937      $cml/core-cml.cm       Internal helper library.
938      $cml-lib/trace-cml.cm  Tracing facility.
939      $cml-lib/smlnj-lib.cm  CML's version of $/smlnj-lib.cm
940    
941    The installer (config/install.sh) has been taught how to properly
942    install this stuff.
943    
944    ----------------------------------------------------------------------
945    Name: Matthias Blume
946    Date: 2001/06/19 17:55:00 EDT
947    Tag: blume-20010619-instantiate
948    Description:
949    
950    This un-breaks the fix for bug 1432.
951    (The bug was originally fixed in 110.9 but I broke it again some
952    time after that.)
953    
954    ----------------------------------------------------------------------
955    Name: Matthias Blume
956    Date: 2001/06/19 17:25:00 EDT
957    Tag: blume-20010619-signals
958    Description:
959    
960    This should (hopefully) fix the long-standing signal handling bug.
961    (The runtime system was constructing a continuation record with an
962    incorrect descriptor which would cause the GC to drop data on the floor...)
963    
964    ----------------------------------------------------------------------
965    Name: Matthias Blume
966    Date: 2001/06/15 15:05:00 EDT
967    Tag: blume-20010615-moresparc
968    Description:
969    
970    Here is a short late-hour update related to Sparc c-calls:
971    
972     -- made handling of double-word arguments a bit smarter
973    
974     -- instruction selection phase tries to collapse certain clumsily
975        constructed ML-Trees; typical example:
976    
977            ADD(ty,ADD(_,e,LI d1),LI d2)  ->  ADD(ty,e,LI(d1+d2))
978    
979        This currently has no further impact on SML/NJ since mlriscGen does
980        not seem to generate such patterns in the first place, and c-calls
981        (which did generate them in the beginning) has meanwhile been fixed
982        so as to avoid them as well.
983    
984    ----------------------------------------------------------------------
985    Name: Matthias Blume
986    Date: 2001/06/15 15:05:00 EDT
987    Tag: blume-20010615-sparc
988    Description:
989    
990    The purpose of this update is to provide an implementation of NLFFI
991    on Sparc machines.
992    
993    Here are the changes in detail:
994    
995       * src/MLRISC/sparc/c-calls/sparc-c-calls.sml is a new file containing
996       the Sparc implementation of the c-calls API.
997       * The Sparc backend of SML/NJ has been modified to uniformely use %fp
998       for accessing the ML frame.  Thus, we have a real frame pointer and
999       can freely modify %sp without need for an omit-frame-ptr phase.
1000       The vfp logic in src/compiler/CodeGen/* has been changed to accomodate
1001       this case.
1002       * ml-nlffigen has been taught to produce code for different architectures
1003       and calling conventions.
1004       * In a way similar to what was done in the x86 case, the Sparc
1005       backend uses its own specific extension to mltree.  (For example,
1006       it needs to be able to generate UNIMP instructions which are part
1007       of the calling convention.)
1008       * ml-nlffi-lib was reorganized to make it more modular (in particular,
1009       to make it easier to plug in new machine- and os-dependent parts).
1010    
1011    There are some other fairly unrelated bug fixes and cleanups as well:
1012    
1013       * I further hacked the .cm files for MLRISC tools (like MDLGen) so
1014       that they properly share their libraries with existing SML/NJ libraries.
1015       * I fixed a minor cosmetic bug in CM, supressing certain spurious
1016       follow-up error messages.
1017       * Updates to CM/CMB documentation.
1018    
1019    TODO items:
1020    
1021       * MLRISC should use a different register as its asmTemp on the Sparc.
1022         (The current %o2 is a really bad choice because it is part of the
1023         calling conventions, so things might interfere in unexpected ways.)
1024    
1025  ----------------------------------------------------------------------  ----------------------------------------------------------------------
1026  Name: Matthias Blume  Name: Matthias Blume
# Line 2368  Line 3378 
3378       elaborator). There were a lot of changes during my "linkpath" trials       elaborator). There were a lot of changes during my "linkpath" trials
3379       that could have been reverted to their original state but weren't.       that could have been reverted to their original state but weren't.
3380       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
3381       than what was strictly necessary...  (I _did_ resist the tempation       than what was strictly necessary...  (I _did_ resist the temptation
3382       of doing any "global reformatting" to avoid an untimely death at       of doing any "global reformatting" to avoid an untimely death at
3383       Dave's hands. :)       Dave's hands. :)
3384    

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