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Diff of /sml/trunk/HISTORY

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revision 615, Wed Apr 12 04:52:09 2000 UTC revision 1003, Fri Dec 7 02:45:32 2001 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: 2001/12/06 16:50:13 EST 2001
17    Tag: george-20011206-mlrisc-instruction
18    Description:
19    
20    Changed the representation of instructions from being fully abstract
21    to being partially concrete. That is to say:
22    
23      from
24            type instruction
25    
26      to
27            type instr                              (* machine instruction *)
28    
29            datatype instruction =
30                LIVE of {regs: C.cellset, spilled: C.cellset}
31              | KILL of {regs: C.cellset, spilled: C.cellset}
32              | COPYXXX of {k: CB.cellkind, dst: CB.cell list, src: CB.cell list}
33              | ANNOTATION of {i: instruction, a: Annotations.annotation}
34              | INSTR of instr
35    
36    This makes the handling of certain special instructions that appear on
37    all architectures easier and uniform.
38    
39    LIVE and KILL say that a list of registers are live or killed at the
40    program point where they appear. No spill code is generated when an
41    element of the 'regs' field is spilled, but the register is moved to
42    the 'spilled' (which is present, more for debugging than anything else).
43    
44    LIVE replaces the (now deprecated) DEFFREG instruction on the alpha.
45    We used to generate:
46    
47            DEFFREG f1
48            f1 := f2 + f3
49            trapb
50    
51    but now generate:
52    
53            f1 := f2 + f3
54            trapb
55            LIVE {regs=[f1,f2,f3], spilled=[]}
56    
57    Furthermore, the DEFFREG (hack) required that all floating point instruction
58    use all registers mentioned in the instruction. Therefore f1 := f2 + f3,
59    defines f1 and uses [f1,f2,f3]! This hack is no longer required resulting
60    in a cleaner alpha implementation. (Hopefully, intel will not get rid of
61    this architecture).
62    
63    COPYXXX is intended to replace the parallel COPY and FCOPY  available on
64    all the architectures. This will result in further simplification of the
65    register allocator that must be aware of them for coalescing purposes, and
66    will also simplify certain aspects of the machine description that provides
67    callbacks related to parallel copies.
68    
69    ANNOTATION should be obvious, and now INSTR represents the honest to God
70    machine instruction set!
71    
72    The <arch>/instructions/<arch>Instr.sml files define certain utility
73    functions for making porting easier -- essentially converting upper case
74    to lower case. All machine instructions (of type instr) are in upper case,
75    and the lower case form generates an MLRISC instruction. For example on
76    the alpha we have:
77    
78      datatype instr =
79         LDA of {r:cell, b:cell, d:operand}
80       | ...
81    
82      val lda : {r:cell, b:cell, d:operand} -> instruction
83        ...
84    
85    where lda is just (INSTR o LDA), etc.
86    
87    ----------------------------------------------------------------------
88    Name: Matthias Blume
89    Date: 2001/11/22 21:40:00 EST
90    Tag: Release_110_37
91    Description:
92    
93    Release 110.37.  This time for real.
94    
95    ----------------------------------------------------------------------
96    Name: Matthias Blume
97    Date: 2001/11/21 16:35:00 EST
98    Tag: blume-20011121-foot-in-mouth
99    Description:
100    
101    Removed the "Release_110_37" tag because of a serious bug.
102    This will be re-tagged once the bug is fixed.
103    
104    ----------------------------------------------------------------------
105    Name: Matthias Blume
106    Date: 2001/11/21 16:14:00 EST
107    Tag: blume-20011121-forgottenfile
108    Description:
109    
110    Forgot to add a file.  (Just a .tex-file -- part of
111    the CM manual source.)
112    
113    ----------------------------------------------------------------------
114    Name: Matthias Blume
115    Date: 2001/11/21 16:10:00 EST
116    Tag: blume-20011121-invalid_110_37
117    Description:
118    
119    Note: I removed the original tag "Release_110_37" from this commit
120          because we found a serious bug in all non-x86 backends.
121          - Matthias
122    
123    1. Modifications to the SML/NJ code generator and to the runtime system
124       so that code object name strings are directly inserted into code
125       objects at code generation time.  The only business the runtime system
126       has with this is now to read the name strings on occasions.
127       (The encoding of the name string has also changed somewhat.)
128    
129    2. CM now implements a simple "set calculus" for specifying export lists.
130       In particular, it is now possible to refer to the export lists of
131       other libraries/groups/sources and form unions as well as differences.
132       See the latest CM manual for details.
133    
134    3. An separate notion of "proxy" libraries has again be eliminated from
135       CM's model.  (Proxy libraries are now simply a special case of using
136       the export list calculus.)
137    
138    4. Some of the existing libraries now take advantage of the new set
139       calculus.
140       (Notice that not all libraries have been converted because some
141       of the existing .cm-files are supposed to be backward compatible
142       with 110.0.x.)
143    
144    5. Some cleanup in stand-alone programs.  (Don't use "exnMessage" -- use
145       "General.exnMessage"!  The former relies on a certain hook to be
146       initialized, and that often does not happen in the stand-alone case.)
147    
148    ----------------------------------------------------------------------
149    Name: Lal George
150    Date: 2001/11/21  13:56:18 EST
151    Tag: george-2001121-pseudo-ops
152    Description:
153    
154      Implemented a complete redesign of MLRISC pseudo-ops. Now there
155      ought to never be any question of incompatabilities with
156      pseudo-op syntax expected by host assemblers.
157    
158      For now, only modules supporting GAS syntax are implemented
159      but more should follow, such as MASM, and vendor assembler
160      syntax, e.g. IBM as, Sun as, etc.
161    
162    ----------------------------------------------------------------------
163    Name: Matthias Blume
164    Date: 2001/11/14 11:52:00 EST
165    Tag: blume-20011114-srcname
166    Description:
167    
168    1. Routed the name of the current source file to mlriscgen where it
169       should be directly emitted into the code object.  (This last part
170       is yet to be done.)
171    
172    2. Some cleanup of the pgraph code to make it match the proposal that
173       I put out the other day.  (The proposal notwithstanding, things are
174       still in flux here.)
175    
176    ----------------------------------------------------------------------
177    Name: Lal George
178    Date: 2001/11/14 09:44:04 EST
179    Tag:
180    Description:
181    
182      Fix for a backpatching bug reported by Allen.
183    
184      Because the boundary between short and long span-dependent
185      instructions is +/- 128, there are an astounding number of
186      span-dependent instructions whose size is over estimated.
187    
188      Allen came up with the idea of letting the size of span
189      dependent instructions be non-monotonic, for a maxIter
190      number of times, after which the size must be monotonically
191      increasing.
192    
193      This table shows the number of span-dependent instructions
194      whose size was over-estimated as a function of maxIter, for the
195      file Parse/parse/ml.grm.sml:
196    
197         maxIter            # of instructions:
198            10                      687
199            20                      438
200            30                      198
201            40                        0
202    
203      In compiling the compiler, there is no significant difference in
204      compilation speed between maxIter=10 and maxIter=40. Actually,
205      my measurements showed that maxIter=40 was a tad faster than
206      maxIter=10! Also 96% of the  files in the compiler reach a fix
207      point within 13 iterations, so fixing maxIter at 40, while high,
208      is okay.
209    
210    ----------------------------------------------------------------------
211    Name: Matthias Blume
212    Date: 2001/10/31 15:25:00 EST
213    Tag: blume-20011031-pgraph
214    Description:
215    
216    CKIT:
217    * Changed the "Function" constructor of type Ast.ctype to carry optional
218      argument identifiers.
219    * Changed the return type of TypeUtil.getFunction accordingly.
220    * Type equality ignores the argument names.
221    * TypeUtil.composite tries to preserve argument names but gives up quickly
222      if there is a mismatch.
223    
224    installation script:
225    * attempts to use "curl" if available (unless "wget" is available as well)
226    
227    CM:
228    * has an experimental implementation of "portable graphs" which I will
229      soon propose as an implementation-independent library format
230    * there are also new libraries $/pgraph.cm and $/pgraph-util.cm
231    
232    NLFFI-LIB:
233    * some cleanup (all cosmetic)
234    
235    NLFFIGEN:
236    * temporarily disabled the mechanism that suppresses ML output for
237      C definitions whose identifiers start with an underscore character
238    * generate val bindings for enum constants
239    * user can request that only one style (light or heavy) is being used;
240      default is to use both (command-line arguments: -heavy and -light)
241    * fixed bug in handling of function types involving incomplete pointers
242    * generate ML entry points that take record arguments (i.e., using
243      named arguments) for C functions that have a prototype with named
244      arguments
245      (see changes to CKIT)
246    
247    ----------------------------------------------------------------------
248    Name: Allen Leung
249    Date: 2001/10/27 20:34:00 EDT
250    Tag: leunga-20011027-x86-fast-fp-call
251    Description:
252    
253       Fixed the bug described in blume-20010920-slowfp.
254    
255       The fix involves
256          1. generating FCOPYs in FSTP in ia32-svid
257          2. marking a CALL with the appropriate annotation
258    
259    ----------------------------------------------------------------------
260    Name: Matthias Blume
261    Date: 2001/10/16 11:32:00 EDT
262    Tag: blume-20011016-netbsd
263    Description:
264    
265    Underscore patch from Chris Richards (fixing problem with compiling
266    runtime system under recent NetBSD).
267    
268    ----------------------------------------------------------------------
269    Name: Allen Leung
270    Date: 2001/10/12 17:18:32 EDT 2001
271    Tag: leung-20011012-x86-printflowgraph
272    Description:
273    
274    X86RA now uses a valid (instead of dummy) PrintFlowgraph module.
275    
276    ----------------------------------------------------------------------
277    Name: Lal George
278    Date: 2001/10/11 23:51:34 EDT
279    Tag: george-20011011-too-many-instrs
280    Description:
281    
282    The representation of a program point never expected to see more
283    than 65536 instructions in a basic block!
284    
285    ----------------------------------------------------------------------
286    Name: Lal George
287    Date: 2001/10/09 09:41:37 EDT
288    Tag: george-20011008-mlrisc-labels
289    Description:
290    
291    Changed the machine description files to support printing of
292    local and global labels in assembly code, based on host assembler
293    conventions.
294    
295    ----------------------------------------------------------------------
296    Name: Matthias Blume
297    Date: 2001/09/25 15:25:00 EDT
298    Tag: blume-20010925-exninfo
299    Description:
300    
301    I provided a non-hook implementation of exnName (at the toplevel) and
302    made the "dummy" implementation of exnMessage (at the toplevel) more
303    useful: if nothing gets "hooked in", then at least you are going to
304    see the exception name and a message indicating why you don't see more.
305    
306    [For the time being, programs that need exnMessage and want to use
307    ml-build should either use General.exnMessage (strongly recommended) or
308    refer to structure General at some other point so that CM sees a
309    static dependency.]
310    
311    [Similar remarks go for "print" and "use":  If you want to use their
312    functionality in stand-alone programs generated by ml-build, then use
313    TextIO.output and Backend.Interact.useFile (from $smlnj/compiler.cm).]
314    
315    ----------------------------------------------------------------------
316    Name: Matthias Blume
317    Date: 2001/09/20 17:28:00 EDT
318    Tag: blume-20010920-slowfp
319    Description:
320    
321    Allen says that x86-fast-fp is not safe yet, so I turned it off again...
322    
323    ----------------------------------------------------------------------
324    Name: Matthias Blume
325    Date: 2001/09/20 17:20:00 EDT
326    Tag: blume-20010920-canonicalpaths
327    Description:
328    
329    0. Updated the BOOT file (something that I forgot to do earlier).
330    
331    1. Small internal change to CM so that it avoids "/../" in filenames
332       as much as possible (but only where it is safe).
333    
334    2. Changed config/_run-sml (resulting in a changed bin/.run-sml) so
335       that arguments that contain delimiters are passed through correctly.
336       This change also means that all "special" arguments of the form
337       @SMLxxx... must come first.
338    
339    3. Changed install script to put relative anchor names for tool commands
340       into pathconfig.
341    
342    ----------------------------------------------------------------------
343    Name: Matthias Blume
344    >>>>>>> 1.169
345    Date: 2001/09/18 15:35:00 EDT
346    Tag: blume-20010918-readme11036
347    Description:
348    
349    Added README files.
350    
351    ----------------------------------------------------------------------
352    Name: Matthias Blume
353    Date: 2001/09/18 11:45:00 EDT
354    Tag: Release_110_36 (retag)
355    Description:
356    
357    Fixed mistake in config/preloads. Retagged as 110.36.
358    
359    ----------------------------------------------------------------------
360    Name: Matthias Blume
361    Date: 2001/09/18 09:40:00 EDT
362    Tag: Release_110_36_orig (tag changed)
363    Description:
364    
365    New version (110.36).  New bootfiles.
366    
367    ----------------------------------------------------------------------
368    Name: Matthias Blume
369    Date: 2001/09/14 16:15:00 EDT
370    Tag: blume-20010914-x86fastfp
371    Description:
372    
373    John committed some changes that Allen made, in particular a (hopefully)
374    correctly working version of the x86-fp module.
375    
376    I changed the default setting of the Control.MLRISC.getFlag "x86-fast-fp"
377    flag to "true".  Everything seems to compile to a fixpoint ok, and
378    "mandelbrot" speeds up by about 15%.
379    
380    ----------------------------------------------------------------------
381    Name: Matthias Blume
382    Date: 2001/09/13 11:20:00 EDT
383    Tag: blume-20010913-minimal
384    Description:
385    
386    1. Stefan Monnier's patch to fix a miscompilation problem that
387       was brought to light by John Reppy's work on Moby.
388    
389    2. Implemented a minimal "structure Compiler" that contains just
390       "version" and "architecture".  The minimal version will be
391       available when the full version is not.  This is for backward-
392       compatibility with code that wants to test Compiler.version.
393    
394    ----------------------------------------------------------------------
395    Name: Matthias Blume
396    Date: 2001/08/28 14:03:00 EDT
397    Tag: blume-20010828-ml-lex
398    Description:
399    
400    Fix for bug 1581, received from Neophytos Michael.
401    
402    ----------------------------------------------------------------------
403    Name: Matthias Blume
404    Date: 2001/08/27 11:20:00 EDT
405    Tag: blume-20010827-readme11035
406    Description:
407    
408    Fleshed out the README file for 110.35.
409    
410    ----------------------------------------------------------------------
411    Name: Matthias Blume
412    Date: 2001/08/24 17:10:00 EDT
413    Tag: Release_110_35
414    Description:
415    
416    New version number (110.35).  New bootfiles.
417    
418    ----------------------------------------------------------------------
419    Name: Lal George
420    Date: 2001/08/24 13:47:18 EDT 2001
421    Tag: george-20010824-MLRISC-graphs
422    Description:
423    
424     removed clusters from MLRISC completely and replaced with graphs.
425    
426    ----------------------------------------------------------------------
427    Name: Matthias Blume
428    Date: 2001/08/23 17:50:00 EDT
429    Tag: blume-20010823-toplevel
430    Description:
431    
432    - some reorganization of the code that implements various kinds of
433      environments in the compiler (static, dynamic, symbolic, combined)
434    - re-implemented the EnvRef module so that evalStream works properly
435      (if the stream contains references to "use", "CM.make", etc.)
436    - cleaned up evalloop.sml and interact.sml (but they need more cleaning)
437    
438    ----------------------------------------------------------------------
439    Name: Matthias Blume
440    Date: 2001/08/20 15:50 EDT
441    Tag: blume20010820-slipup
442    Description:
443    
444    I forgot to commit a few files.  Here they are...
445    
446    ----------------------------------------------------------------------
447    Name: Matthias Blume
448    Date: 2001/08/20 15:35:00 EDT
449    Tag: blume-20010820-debugprof
450    Description:
451    
452    !!!! NEW BOOTFILES !!!!
453    
454    This is another round of reorganizing the compiler sources.  This
455    time the main goal was to factor out all the "instrumentation"
456    passes (for profiling and backtracing) into their own library.
457    The difficulty was to do it in such a way that it does not depend
458    on elaborate.cm but only on elabdata.cm.
459    
460    Therefore there have been further changes to both elaborate.cm and
461    elabdata.cm -- more "generic" things have been moved from the former
462    to the latter.  As a result, I was forced to split the assignment
463    of numbers indicating "primtyc"s into two portions: SML-generic and
464    SML/NJ-specific.  Since it would have been awkward to maintain,
465    I bit the bullet and actually _changed_ the mapping between these
466    numbers and primtycs.  The bottom line of this is that you need
467    a new set of bin- and bootfiles.
468    
469    I have built new bootfiles for all architectures, so doing a fresh
470    checkout and config/install.sh should be all you need.
471    
472    The newly created library's name is
473    
474        $smlnj/viscomp/debugprof.cm
475    
476    and its sources live under
477    
478        src/compiler/DebugProf
479    
480    ----------------------------------------------------------------------
481    Name: Matthias Blume
482    Date: 2001/08/15 17:15:00 EDT
483    Tag: blume-20010815-compreorg
484    Description:
485    
486    This is a first cut at reorganizing the CM libraries that make up the
487    core of the compiler.  The idea is to separate out pieces that could
488    be used independently by tools, e.g., the parser, the typechecker, etc.
489    
490    The current status is a step in this direction, but it is not quite
491    satisfactory yet.  Expect more changes in the future.
492    
493    Here is the current (new) organization...
494    
495        What used to be $smlnj/viscomp/core.cm is now divided into
496        six CM libraries:
497    
498             $smlnj/viscomp/basics.cm
499                           /parser.cm
500                           /elabdata.cm
501                           /elaborate.cm
502                           /execute.cm
503                           /core.cm
504    
505        The CM files for these libraries live under src/system/smlnj/viscomp.
506        All these libraries are proxy libraries that contain precisely
507        one CM library component.  Here are the locations of the components
508        (all within the src/compiler tree):
509    
510             Basics/basics.cm
511             Parse/parser.cm
512             ElabData/elabdata.cm
513             Elaborator/elaborate.cm
514             Execution/execute.cm
515             core.cm
516    
517         [This organization is the same that has been used already
518         for a while for the architecture-specific parts of the visible
519         compiler and for the old version of core.cm.]
520    
521         As you will notice, many source files have been moved from their
522         respective original locations to a new home in one of the above
523         subtrees.
524    
525         The division of labor between the new libraries is the following:
526    
527             basics.cm:
528                - Simple, basic definitions that pertain to many (or all) of
529                  the other libraries.
530             parser.cm:
531                - The SML parser, producing output of type Ast.dec.
532                - The type family for Ast is also defined and exported here.
533             elabdata.cm:
534                - The datatypes that describe input and output of the elaborator.
535                  This includes types, absyn, and static environments.
536             elaborator.cm:
537                - The SML/NJ type checker and elaborator.
538                  This maps an Ast.dec (with a given static environment) to
539                  an Absyn.dec (with a new static environment).
540                - This libraries implements certain modules that used to be
541                  structures as functors (to remove dependencies on FLINT).
542             execute.cm:
543                - Everything having to do with executing binary code objects.
544                - Dynamic environments.
545             core.cm:
546                - SML/NJ-specific instantiations of the elaborator and MLRISC.
547                - Top-level modules.
548                - FLINT (this should eventually become its own library)
549    
550    Notes:
551    
552    I am not 100% happy with the way I separated the elaborator (and its
553    data structures) from FLINT.  Two instances of the same problem:
554    
555        1. Data structures contain certain fields that carry FLINT-specific
556           information.  I hacked around this using exn and the property list
557           module from smlnj-lib.  But the fact that there are middle-end
558           specific fields around at all is a bit annoying.
559    
560        2. The elaborator calculates certain FLINT-related information.  I tried
561           to make this as abstract as I could using functorization, but, again,
562           the fact that the elaborator has to perform calculations on behalf
563           of the middle-end at all is not nice.
564    
565        3. Having to used exn and property lists is unfortunate because it
566           weakens type checking.  The other alternative (parameterizing
567           nearly *everything*) is not appealing, though.
568    
569    I removed the "rebinding =" warning hack because due to the new organization
570    it was awkward to maintain it.  As a result, the compiler now issues some of
571    these warnings when compiling init.cmi during bootstrap compilation. On
572    the plus side, you also get a warning when you do, for example:
573       val op = = Int32.+
574    which was not the case up to now.
575    
576    I placed "assign" and "deref" into the _Core structure so that the
577    code that deals with the "lazy" keyword can find them there.  This
578    removes the need for having access to the primitive environment
579    during elaboration.
580    
581    ----------------------------------------------------------------------
582    Name: Matthias Blume
583    Date: 2001/08/13
584    Tag: blume-20010813-closures
585    Description:
586    
587    This fix was sent to us by Zhong Shao.  It is supposed to improve the
588    performance of certain loops by avoiding needless closure allocation.
589    
590    ----------------------------------------------------------------------
591    Name: Lal George
592    Date: 2001/07/31 10:03:23 EDT 2001
593    Tag: george-20010731-x86-fmalloc
594    Description: Fixed bug in x86 calls
595    
596        There was a bug where call instructions would mysteriously
597        vanish. The call instruction had to be one that returned
598        a floating point value.
599    
600    ----------------------------------------------------------------------
601    Name: Lal George
602    Date: 2001/07/19 16:36:29 EDT 2001
603    Tag: george-20010719-simple-cells
604    Description:
605    
606    I have dramatically simplified the interface for CELLS in MLRISC.
607    
608    In summary, the cells interface is broken up into three parts:
609    
610      1. CellsBasis : CELLS_BASIS
611    
612            CellsBasis is a top level structure and common for all
613            architectures.  it contains the definitions of basic datatypes
614            and utility  functions over these types.
615    
616      2. functor Cells() : CELLS
617    
618            Cells generates an interface for CELLS that incorporates the
619            specific resources on the target architecture, such as the
620            presence of special register classes, their number and size,
621            and various useful substructures.
622    
623      3. <ARCH>CELLS
624    
625            e.g. SparcCells: SPARCCELLS
626    
627            <ARCH>CELLS usually contains additional bindings for special
628            registers  on the architecture, such as:
629    
630                    val r0 : cell           (* register zero *)
631                    val y : cell            (* Y register *)
632                    val psr : cell          (* processor status register *)
633                    ...
634    
635            The structure returned by applying the Cells functor is opened
636            in this interface.
637    
638    The main implication of all this is that the datatypes for cells is
639    split between CellsBasis and CELLS -- a fairly simple change for user
640    code.
641    
642    In the old scheme the CELLS interface had a definitional binding of
643    the form:
644    
645            signature CELLS = sig
646    
647               structure CellsBasis = CellsBasis
648    
649               ...
650    
651            end
652    
653    With all the sharing constraints that goes on in MLRISC, this old
654    design  quickly leads to errors such as:
655    
656            "structure definition spec inside of sharing ... "
657    
658    
659    and appears to require an unacceptable amount of sharing and where
660    constraint hackery.
661    
662    I think this error message (the interaction of definitional specs and
663    sharing) requires more explanation on our web page.
664    
665    ----------------------------------------------------------------------
666    Name: Matthias Blume
667    Date: 2001/07/19 15:00:00 EDT
668    Tag: blume-20010719-libreorg
669    Description:
670    
671    This update puts together a fairly extensive but straightforward change
672    to the way the libraries that implement the interactive system are
673    organized:
674    
675       The biggest change is the elimination of structure Compiler.  As a
676       replacement for this structure, there is now a CM library
677       (known as $smlnj/compiler.cm or $smlnj/compiler/current.cm)
678       that exports all the substructures of the original structure Compiler
679       directly.  So instead of saying Compiler.Foo.bar one now simply
680       says Foo.bar.  (The CM libraries actually export a collection of
681       structures that is richer than the collection of substructures of
682       structure Compiler.)
683    
684       To make the transition smooth, there is a separate library called
685       $smlnj/compiler/compiler.cm which puts together and exports the
686       original structure Compiler (or at least something very close to it).
687    
688       There are five members of the original structure Compiler
689       that are not exported directly but which instead became members
690       of a new structure Backend (described by signature BACKEND).  These are:
691       structure Profile (: PROFILE), structure Compile (: COMPILE), structure
692       Interact (: INTERACT), structure Machine (: MACHINE), and val
693       architecture (: string).
694    
695       Structure Compiler.Version has become structure CompilerVersion.
696    
697       Cross-compilers for alpha32, hppa, ppc, sparc, and x86 are provided
698       by $smlnj/compiler/<arch>.cm where <arch> is alpha32, hppa, ppc, sparc,
699       or x86, respectively.
700       Each of these exports the same frontend structures that
701       $smlnj/compiler.cm exports.  But they do not have a structure Backend
702       and instead export some structure <Arch>Backend where <Arch> is Alpha32,
703       Hppa, PPC, Sparc, or X86, respectively.
704    
705       Library $smlnj/compiler/all.cm exports the union of the exports of
706       $smlnj/compiler/<arch>.cm
707    
708       There are no structures <Arch>Compiler anymore, use
709       $smlnj/compiler/<arch>.cm instead.
710    
711       Library host-compiler-0.cm is gone.  Instead, the internal library
712       that instantiates CM is now called cm0.cm.  Selection of the host
713       compiler (backend) is no longer done here but. (Responsibility for it
714       now lies with $smlnj/compiler/current.cm.  This seems to be more
715       logical.)
716    
717       Many individual files have been moved or renamed.  Some files have
718       been split into multiple files, and some "dead" files have been deleted.
719    
720    Aside from these changes to library organization, there are also changes
721    to the way the code itself is organized:
722    
723       Structure Binfile has been re-implemented in such a way that it no
724       longer needs any knowledge of the compiler.  It exclusively deals
725       with the details of binfile layout.  It no longer invokes the
726       compiler (for the purpose of creating new prospective binfile
727       content), and it no longer has any knowledge of how to interpret
728       pickles.
729    
730       Structure Compile (: COMPILE) has been stripped down to the bare
731       essentials of compilation.  It no longer deals with linking/execution.
732       The interface has been cleaned up considerably.
733    
734       Utility routines for dealing with linking and execution have been
735       moved into their own substructures.
736    
737       (The ultimate goal of these changes is to provide a light-weight
738       binfile loader/linker (at least for, e.g., stable libraries) that
739       does not require CM or the compiler to be present.)
740    
741    CM documentation has been updated to reflect the changes to library
742    organization.
743    
744    ----------------------------------------------------------------------
745    Name: Matthias Blume
746    Date: 2001/07/10 17:30:00 EDT
747    Tag: Release_110_34
748    Description:
749    
750    Minor tweak to 110.34 (re-tagged):
751    
752      - README.html file added to CVS repository
753      - runtime compiles properly under FreeBSD 3.X and 4.X
754    
755    ----------------------------------------------------------------------
756    Name: Matthias Blume
757    Date: 2001/07/10 17:30:00 EDT
758    Tag: Release_110_34
759    Description:
760    
761    New version number (110.34). New bootfiles.
762    
763    ----------------------------------------------------------------------
764    Name: Matthias Blume
765    Date: 2001/07/09 16:00:00 EDT
766    Tag: blume-20010709-more-varargs
767    Description:
768    
769    I changed the handling of varargs in ml-nlffigen again:
770    The ellipsis ... will now simply be ignored (with an accompanying warning).
771    
772    The immediate effect is that you can actually call a varargs function
773    from ML -- but you can't actually supply any arguments beyond the ones
774    specified explicitly.  (For example, you can call printf with its format
775    string, but you cannot pass additional arguments.)
776    
777    This behavior is only marginally more useful than the one before, but
778    it has the advantage that a function or, more importantly, a function
779    type never gets dropped on the floor, thus avoiding follow-up problems with
780    other types that refer to the offending one.
781    
782    ----------------------------------------------------------------------
783    Name: Matthias Blume
784    Date: 2001/07/09 11:25:00 EDT
785    Tag: blume-20010709-varargs
786    Description:
787    
788    1. ckit-lib.cm now exports structure Error
789    2. ml-nlffigen reports occurences of "..." (i.e., varargs function types)
790       with a warning accompanied by a source location.  Moreover, it
791       merely skips the offending function or type and proceeds with the
792       rest of its work.u  As a result, one can safely feed C code containing
793       "..." to ml-nlffigen.
794    3. There are some internal improvements to CM, providing slightly
795       more general string substitutions in the tools subsystem.
796    
797    ----------------------------------------------------------------------
798    Name: Matthias Blume
799    Date: 2001/06/27 15:10:00 EDT
800    Tag: blume-20010627-concur
801    Description:
802    
803    Fixed a small bug in CM's handling of parallel compilation.
804    (You could observe the bug by Control-C-interrupting an ordinary
805    CMB.make or CM.stabilize and then attaching some compile servers.
806    The result was that all of a sudden the previously interrupted
807    compilation would continue on its own.  This was because of
808    an over-optimization: CM did not bother to clean out certain queues
809    when no servers were attached "anyway", resulting in the contents
810    of these queues to grab control when new servers did get attached.)
811    
812    There is also another minor update to the CM manual.
813    
814    ----------------------------------------------------------------------
815    Name: Matthias Blume
816    Date: 2001/06/26 16:15:00 EDT
817    Tag: blume-20010626-cmdoc
818    Description:
819    
820    Minor typo fixed in CM manual (syntax diagram for libraries).
821    
822    ----------------------------------------------------------------------
823    Name: Matthias Blume
824    Date: 2001/06/25 22:55:00 EDT
825    Tag: blume-20010625-x86pc
826    Description:
827    
828    Fixed a nasty bug in the X86 assembly code that caused signal
829    handlers to fail (crash) randomly.
830    
831    ----------------------------------------------------------------------
832    Name: Matthias Blume
833    Date: 2001/06/25 12:05:00 EDT
834    Tag: blume-20010625-nlffigen
835    Description:
836    
837    This update fixes a number of minor bugs in ml-nlffigen as reported by
838    Nick Carter <nbc@andrew.cmu.edu>.
839    
840      1. Silly but ok typedefs of the form "typedef void myvoid;" are now accepted.
841      2. Default names for generated files are now derived from the name of
842         the C file *without its directory*.  In particular, this causes generated
843         files to be placed locally even if the C file is in some system directory.
844      3. Default names for generated signatures and structures are also derived
845         from the C file name without its directory.  This avoids silly things
846         like "structure GL/GL".
847         (Other silly names are still possible because ml-nlffigen does not do
848          a thorough check of whether generated names are legal ML identifiers.
849          When in doubt, use command line arguments to force particular names.)
850    
851    ----------------------------------------------------------------------
852    Name: Matthias Blume
853    Date: 2001/06/21 12:25:00 EDT
854    Tag: blume-20010621-eXene
855    Description:
856    
857    eXene now compiles and (sort of) works again.
858    
859    The library name (for version > 110.33) is $/eXene.cm.
860    
861    I also added an new example in src/eXene/examples/nbody.  See the
862    README file there for details.
863    
864    ----------------------------------------------------------------------
865    Name: Matthias Blume
866    Date: 2001/06/20 16:40:00 EDT
867    Tag: blume-20010620-cml
868    Description:
869    
870    CML now compiles and works again.
871    
872    Libraries (for version > 110.33):
873    
874      $cml/cml.cm            Main CML library.
875      $cml/basis.cm          CML's version of $/basis.cm.
876      $cml/cml-internal.cm   Internal helper library.
877      $cml/core-cml.cm       Internal helper library.
878      $cml-lib/trace-cml.cm  Tracing facility.
879      $cml-lib/smlnj-lib.cm  CML's version of $/smlnj-lib.cm
880    
881    The installer (config/install.sh) has been taught how to properly
882    install this stuff.
883    
884    ----------------------------------------------------------------------
885    Name: Matthias Blume
886    Date: 2001/06/19 17:55:00 EDT
887    Tag: blume-20010619-instantiate
888    Description:
889    
890    This un-breaks the fix for bug 1432.
891    (The bug was originally fixed in 110.9 but I broke it again some
892    time after that.)
893    
894    ----------------------------------------------------------------------
895    Name: Matthias Blume
896    Date: 2001/06/19 17:25:00 EDT
897    Tag: blume-20010619-signals
898    Description:
899    
900    This should (hopefully) fix the long-standing signal handling bug.
901    (The runtime system was constructing a continuation record with an
902    incorrect descriptor which would cause the GC to drop data on the floor...)
903    
904    ----------------------------------------------------------------------
905    Name: Matthias Blume
906    Date: 2001/06/15 15:05:00 EDT
907    Tag: blume-20010615-moresparc
908    Description:
909    
910    Here is a short late-hour update related to Sparc c-calls:
911    
912     -- made handling of double-word arguments a bit smarter
913    
914     -- instruction selection phase tries to collapse certain clumsily
915        constructed ML-Trees; typical example:
916    
917            ADD(ty,ADD(_,e,LI d1),LI d2)  ->  ADD(ty,e,LI(d1+d2))
918    
919        This currently has no further impact on SML/NJ since mlriscGen does
920        not seem to generate such patterns in the first place, and c-calls
921        (which did generate them in the beginning) has meanwhile been fixed
922        so as to avoid them as well.
923    
924    ----------------------------------------------------------------------
925    Name: Matthias Blume
926    Date: 2001/06/15 15:05:00 EDT
927    Tag: blume-20010615-sparc
928    Description:
929    
930    The purpose of this update is to provide an implementation of NLFFI
931    on Sparc machines.
932    
933    Here are the changes in detail:
934    
935       * src/MLRISC/sparc/c-calls/sparc-c-calls.sml is a new file containing
936       the Sparc implementation of the c-calls API.
937       * The Sparc backend of SML/NJ has been modified to uniformely use %fp
938       for accessing the ML frame.  Thus, we have a real frame pointer and
939       can freely modify %sp without need for an omit-frame-ptr phase.
940       The vfp logic in src/compiler/CodeGen/* has been changed to accomodate
941       this case.
942       * ml-nlffigen has been taught to produce code for different architectures
943       and calling conventions.
944       * In a way similar to what was done in the x86 case, the Sparc
945       backend uses its own specific extension to mltree.  (For example,
946       it needs to be able to generate UNIMP instructions which are part
947       of the calling convention.)
948       * ml-nlffi-lib was reorganized to make it more modular (in particular,
949       to make it easier to plug in new machine- and os-dependent parts).
950    
951    There are some other fairly unrelated bug fixes and cleanups as well:
952    
953       * I further hacked the .cm files for MLRISC tools (like MDLGen) so
954       that they properly share their libraries with existing SML/NJ libraries.
955       * I fixed a minor cosmetic bug in CM, supressing certain spurious
956       follow-up error messages.
957       * Updates to CM/CMB documentation.
958    
959    TODO items:
960    
961       * MLRISC should use a different register as its asmTemp on the Sparc.
962         (The current %o2 is a really bad choice because it is part of the
963         calling conventions, so things might interfere in unexpected ways.)
964    
965    ----------------------------------------------------------------------
966    Name: Matthias Blume
967    Date: 2001/06/07
968    Tag: blume-20010607-calls
969    Description:
970    
971    A number of internal changes related to C calls and calling conventions:
972    
973    1. ML-Tree CALL statements now carry a "pops" field.  It indicates the
974       number of bytes popped implicitly (by the callee).  In most cases
975       this field is 0 but on x86/win32 it is some non-zero value.  This
976       is information provided for the benefit of the "omit-frameptr" pass.
977    2. The CALL instruction on the x86 carries a similar "pops" field.
978       The instruction selection phase copies its value from the ML-Tree
979       CALL statement.
980    3. On all other architectures, the instruction selection phase checks
981       whether "pops=0" and complains if not.
982    4. The c-calls implementation for x86 now accepts two calling conventions:
983       "ccall" and "stdcall".  When "ccall" is selected, the caller cleans
984       up after the call and pops is set to 0.  For "stdcall", the caller
985       does nothing, leaving the cleanup to the callee; pops is set to
986       the number of bytes that were pushed onto the stack.
987    5. The cproto decoder (compiler/Semant/types/cproto.sml) now can
988       distinguish between "ccall" and "stdcall".
989    6. The UNIMP instruction has been added to the supported Sparc instruction
990       set. (This is needed for implementing the official C calling convention
991       on this architecture.)
992    7. I fixed some of the .cm files under src/MLRISC/Tools to make them
993       work with the latest CM.
994    
995    ----------------------------------------------------------------------
996    Name: Matthias Blume
997    Date: 2001/06/05 15:10:00 EDT
998    Tag: blume-20010605-cm-index
999    Description:
1000    
1001    0. The "lambdasplit" parameter for class "sml" in CM has been documented.
1002    
1003    1. CM can now generate "index files".  These are human-readable files
1004       that list on a per-.cm-file basis each toplevel symbol defined or
1005       imported.  The location of the index file for
1006       <p>/<d>.cm is <p>/CM/INDEX/<d>.cm.
1007       To enable index-file generation, set CM.Control.generate_index to true
1008       or export an environment-symbol: export CM_GENERATE_INDEX=true.
1009    
1010       The CM manual has been updated accordingly.
1011    
1012    2. I made some slight modifications to the c-calls API in MLRISC.
1013    
1014         a) There is now a callback to support saving/restoring of
1015            dedicated but caller-save registers around the actual call
1016            instruction.
1017         b) One can optionally specify a comment-annotation for the
1018            call instruction.
1019    
1020    3. SML/NJ (mlriscGen.sml) uses this new API for the rawccall primop.
1021       (For example, the comment annotation shows the C prototype of
1022        the function being called.)
1023    
1024    ----------------------------------------------------------------------
1025    Name: Matthias Blume
1026    Date: 2001/06/01 13:30:00 EDT
1027    Tag: blume-20010601-nlffi-cleanup
1028    Description:
1029    
1030    This is mostly a cleanup of MLFFI stuff:
1031    
1032       - some signature files have been put into a more exposed place
1033       - the ugly 'f type parameter is gone (simplifies types tremendously!)
1034       - ml-nlffigen changed accordingly
1035       - tutorial updated
1036    
1037    Other changes:
1038    
1039       - author's affiliation in CM manual(s) updated
1040       - some more recognized keywords added to Allen's sml.sty
1041    
1042    ----------------------------------------------------------------------
1043    Name: Matthias Blume
1044    Date: 2001/05/25 15:30:00 EDT
1045    Tag: blume-20010525-iptr
1046    Description:
1047    
1048      - put the official 110.33-README (as it appears on the ftp server) under
1049        CVS
1050      - fixed a small bug related to incomplete pointer types in
1051        ml-nlffigen
1052      - small cosmetic change to the ml-nlffi-lib's "arr" type constructor
1053        (it does not need the 'f type parameter)
1054    
1055    ----------------------------------------------------------------------
1056    Name: Matthias Blume
1057    Date: 2001/05/23 14:30:00 EDT
1058    Tag: Release_110_33
1059    Description:
1060    
1061    New version number (110.33).  New bootfiles.
1062    
1063    ----------------------------------------------------------------------
1064    Name: Matthias Blume
1065    Date: 2001/05/22 18:06:00 EDT
1066    Tag: blume-20010522-targets
1067    Description:
1068    
1069    Made install.sh use file config/targets.customized if it exists, falling
1070    back to config/targets if it doesn't.  This way one can have a customized
1071    version of the targets file without touching the "real thing", thus
1072    eliminating the constant fear of accidentally checking something bogus
1073    back into the CVS repository...  (File config/targets.customized must
1074    not be added to the repository!)
1075    
1076    ----------------------------------------------------------------------
1077    Name: Matthias Blume
1078    Date: 2001/05/22 16:30:00 EDT
1079    Tag: blume-20010522-minitut
1080    Description:
1081    
1082    1. Bug fix in ml-nlffigen; now (hopefully) correctly handling
1083       struct returns.
1084    2. Added src/ml-nlffi-lib/Doc/mini-tutorial.txt.  This is some very
1085       incomplete, preliminary documentation for NLFFI.
1086    
1087    ----------------------------------------------------------------------
1088    Name: Matthias Blume
1089    Date: 2001/05/14 11:30:00 EDT
1090    Tag: blume-20010514-script
1091    Description:
1092    
1093    Some bugs in install script fixed.
1094    
1095    In addition to that I also made a slight change to the NLFFI API:
1096    Functors generated by ml-nlffigen now take the dynamic library as a
1097    straight functor argument, not as a suspended one.  (The original
1098    functor code used to force the suspension right away anyway, so there
1099    was nothing gained by this complication of the interface.)
1100    
1101    ----------------------------------------------------------------------
1102    Name: Matthias Blume
1103    Date: 2001/05/11 14:35:00 EDT
1104    Tag: blume-20010511-ml-nlffi
1105    Description:
1106    
1107    I finally took the plunge and added my new FFI code to the main
1108    repository.  For x86-linux it is now ready for prime-time.
1109    
1110    There are two new subdirectories of "src":
1111    
1112      - ml-nlffi-lib:
1113           The utility library for programs using the FFI interface.
1114           Here is the implementation of $/c.cm and its associated low-level
1115           partners $/c-int.cm and $/memory.cm.
1116      - ml-nlffigen:
1117           A stand-alone program for generating ML glue code from C source
1118           code.
1119    
1120    Building ml-nlffigen requires $/ckit-lib.cm.
1121    
1122    The config/install.sh script has been updates to do the Right Thing
1123    (hopefully).
1124    
1125    Notice that the source tree for the C-Kit will not be put under "src"
1126    but directly under the installation root directory.  (This is the
1127    structure that currently exists on the CVS server when you check out
1128    module "sml".)  Fortunately, config/install.sh knows about this oddity.
1129    
1130    Bugs: No documentation yet.
1131    
1132    ----------------------------------------------------------------------
1133    Name: Matthias Blume
1134    Date: 2001/05/09 16:35:00 EDT
1135    Tag: blume-20010509-cpscontract
1136    Description:
1137    
1138    Fixed a bug in the accounting code in cpsopt/contract.sml.  (The
1139    wrapper/unwrapper elimination did not decrement usage counts and some
1140    dead variables got overlooked by the dead-up logic.)
1141    
1142    ----------------------------------------------------------------------
1143    Name: Lal George
1144    Date: 2001/05/08  17:26:09 EDT
1145    Tag: george-20010508-omit-frameptr
1146    Description:
1147    
1148    Changes to implement the omit-frame-pointer optimization to support
1149    raw C calls. For now, there is only support on the Intel x86, but
1150    other architectures will follow as more experience is gained with this.
1151    
1152    
1153    ----------------------------------------------------------------------
1154    Name: Matthias Blume
1155    Date: 2001/05/07 14:40:00 EDT
1156    Tag: blume-20010507-proxies
1157    Description:
1158    
1159    I made into "proxy libraries" all libraries that qualify for such a
1160    change.  (A qualifying library is a library that has another library or
1161    groups as its sole member and repeats that member's export list
1162    verbatim.  A proxy library avoids this repetition by omitting its export
1163    list, effectively inheriting the list that its (only) member exports.
1164    See the CM manual for more explanation.)
1165    The main effect is that explicit export lists for these libraries
1166    do not have to be kepts in sync, making maintenance a bit easier.
1167    
1168    I also added copyright notices to many .cm-files.
1169    
1170    Last but not least, I made a new set of bootfiles.
1171    
1172    ----------------------------------------------------------------------
1173    Name: Matthias Blume
1174    Date: 2001/05/04 17:00:00 EDT
1175    Tag: blume-20010504-cm-lsplit
1176    Description:
1177    
1178    0. John merged pending changes to $/smlnj-lib.cm
1179    
1180    1. Allen's previous change accidentally backed out of one of Lal's
1181       earlier changes.  I undid this mistake (re-introducing Lal's change).
1182    
1183    2. I used the new topOrder' function from graph-scc.sml (from $/smlnj-lib.cm)
1184       within the compiler where applicable.  There is some code simplification
1185       because of that.
1186    
1187    3. The "split" phase (in FLINT) is now part of the default list of phases.
1188       Compiler.Control.LambdaSplitting.* can be used to globally control the
1189       lambda-splitting (cross-module-inlining) engine.  In addition to that,
1190       it can now also be controlled on a per-source basis: CM has been taught
1191       a new tool parameter applicable to ML source files.
1192    
1193       - To turn lambda-splitting off completely:
1194            local open Compiler.Control.LambdaSplitting in
1195                val _ = set Off
1196            end
1197       - To make "no lambda-splitting" the global default (but allow per-source
1198         overriding); this is the initial setting:
1199            local open Compiler.Control.LambdaSplitting in
1200                val _ = set (Default NONE)
1201            end
1202       - To make "lambda-splitting with aggressiveness a" the global default
1203         (and allow per-source overriding):
1204            local open Compiler.Control.LambdaSplitting in
1205                val _ = set (Default (SOME a))
1206            end
1207    
1208       - To turn lambda-splitting off for a given ML souce file (say: a.sml)
1209         write (in the respective .cm-file):
1210            a.sml (lambdasplitting:off)
1211       - To turn lambda-splitting for a.sml on with minimal aggressiveness:
1212            a.sml (lambdasplitting:on)
1213       - To turn lambda-splitting for a.sml on with aggressiveness <a> (where
1214         <a> is a decimal non-negative integer):
1215            a.sml (lambdasplitting:<a>)
1216       - To turn lambda-splitting for a.sml on with maximal aggressiveness:
1217            a.sml (lambdasplitting:infinity)
1218       - To use the global default for a.sml:
1219            a.sml (lambdasplitting:default)
1220         or simply
1221            a.sml
1222    
1223    ----------------------------------------------------------------------
1224    Name: Allen Leung
1225    Date: 2001/05/04 01:57:00 EDT
1226    Tag: leunga-20010504-sync
1227    Description:
1228    
1229      MLRISC features.
1230    
1231      1. Fix to CMPXCHG instructions.
1232      2. Changed RA interface to allow annotations in callbacks.
1233      3. Added a new method to the stream interface to allow annotations updates.
1234    
1235    ----------------------------------------------------------------------
1236    Name: Matthias Blume
1237    Date: 2001/05/01 11:45:00 EDT
1238    Tag: blume-20010501-pcedittmp
1239    Description:
1240    
1241    Changed install.sh to use the current working directory instead of
1242    /usr/tmp for a temporary file (pcedittmp).  The previous choice
1243    of /usr/tmp caused trouble with MacOS X because of file premission
1244    problems.
1245    
1246    ----------------------------------------------------------------------
1247    Name: Matthias Blume
1248    Date: 2001/04/20 11:10:00 EDT
1249    Tag: blume-20010420-inMLflag
1250    Description:
1251    
1252     - added vp_limitPtrMask to vproc-state.h
1253       (for use by the raw-C-calls mechanism to implement proper interrupt
1254        handling)
1255     - made the ML compiler aware of various data-structure offsets so it
1256       can generate code for accessing the vp_inML flag and vp_limitPtrMask
1257     - tweaked mlriscGen.sml to have it emit interrupt-handling code for
1258       raw C-calls
1259    
1260    ----------------------------------------------------------------------
1261    Name: Lal George
1262    Date: 2001/04/20 09:15:28 EDT
1263    Tag: george-20010420-macosX
1264    Description:
1265    
1266     - Changes to port to Mac OS X; Darwin.
1267    
1268     - In the process I found that sqrt was broken on the PPC, because the
1269       fsqrt instruction is not implemented.
1270    
1271    ----------------------------------------------------------------------
1272    Name: Matthias Blume
1273    Date: 2001/04/18 12:45:00 EDT
1274    Tag: blume-20010418-ccalls
1275    Description:
1276    
1277     - fixed two off-by-4 errors in the x86-specific c-calls implementation
1278       (this bug prevented structure arguments containing pointers from being
1279        passed correctly)
1280     - changed the raw-C-call code in mlriscGen.sml in such a way that
1281       structure arguments are represented as a pointer to the beginning
1282       of the structure (instead of having a series of synthesized arguments,
1283       one for each structure member)
1284    
1285     - made makeml script's verbosity level configurable via environment
1286       variable (MAKEML_VERBOSITY)
1287    
1288     - eliminated placeholder implementations for f32l, w16s, i16s, and f32s
1289       in rawmem-x86.sml; we are now using the real thing
1290    
1291    ----------------------------------------------------------------------
1292    Name: Matthias Blume
1293    Date: 2001/03/22 16:25:00 EST
1294    Tag: blume-20010322-bootfiles
1295    Description:
1296    
1297    Created a new set of bootfiles (for your automatic installation convenience).
1298    
1299    ----------------------------------------------------------------------
1300    Name: Matthias Blume
1301    Date: 2001/03/22 15:10:00 EST
1302    Tag: blume-20010322-rawmem-parcm
1303    Description:
1304    
1305    1. All "raw memory access" primitives for the new FFI are implemented now
1306       (at least on the x86).
1307    2. Some further cleanup of CM's parallel make mechanism.
1308    
1309    ----------------------------------------------------------------------
1310    Name: Matthias Blume
1311    Date: 2001/03/19 17:53:00 EST
1312    Tag: blume-20010319-parallel
1313    Description:
1314    
1315    Parallel make (using compile servers) now works again.
1316    
1317    To this end, CM.stabilize and CMB.make have been modified to work in
1318    two passes when compile servers are attached:
1319       1. Compile everything, do not perform stabilization; this pass
1320          uses compile servers
1321       2. Stabilize everything; this pass does not use compile servers
1322    If there are no compile servers, the two passes are combined into one
1323    (as before).  Splitting the passes increases the inherent parallelism
1324    in the dependency graph because the entire graph including all
1325    libraries is available at the same time.  This, in turn, improves
1326    server utilization.  The downside is that the master process will
1327    have to do some extra work after compilation is done (because for
1328    technical reasons it must re-read all the binfiles during stabilization).
1329    
1330    ----------------------------------------------------------------------
1331    Name: Matthias Blume
1332    Date: 2001/03/16 12:22:00 EST
1333    Tag: blume-20010316-bootfiles
1334    Description:
1335    
1336    Created a new set of bootfiles (for your automatic installation convenience).
1337    
1338    ----------------------------------------------------------------------
1339    Name: Matthias Blume
1340    Date: 2001/03/16 11:00:00 EST
1341    Tag: blume-20010316-MLTREE-fixup
1342    Description:
1343    
1344    This is a minor fixup for an (untagged) earlier commit by Allen.
1345    (A file was missing).
1346    
1347    ----------------------------------------------------------------------
1348    Name: Allen Leung
1349    Date: Mon Mar  5 18:54:57 EST 2001
1350    Tag: leunga-20010305-cut-support
1351    
1352    1. New support for alternative control-flow in MLTREE.
1353       Currently we support
1354    
1355          FLOW_TO(CALL ...., [k1,...,kn])
1356    
1357       This is needed for 'cuts to' in C-- and try/handle-like constructs
1358       in Moby
1359    
1360       New assembler flag "asm-show-cutsto" to turn on control-flow debugging.
1361    
1362    2. Register Allocator
1363    
1364       Changes in interface [from Fermin, John]
1365    
1366    3. Alpha 8-bit SLL support [Fermin]
1367    
1368    4. All architectures
1369    
1370       A new module (ClusterExpandCopies) for expanding parallel copies.
1371    
1372    ----------------------------------------------------------------------
1373    Name: Allen Leung
1374    Date: 2001/02/27 23:07:00 EST
1375    Tag: leunga-20010227-minor-stuff
1376    
1377    1. Alpha bug fix for CMOVNE
1378    2. Handle mltree COND(..,FCMP ...,...)
1379    3. Bug fix in simplifier
1380    
1381    ----------------------------------------------------------------------
1382    Name: Matthias Blume
1383    Date: 2001/01/30 17:50:00 EST
1384    Tag: blume-20010130-sync
1385    Description:
1386    
1387    This is just a minor update to sync my devel branch with the main brach.
1388    The only visible change is the addition of some README files.
1389    
1390    ----------------------------------------------------------------------
1391    Name: Matthias Blume
1392    Date: 2001/01/12 23:30:00 JST
1393    Tag: blume-20010112-bootfiles
1394    Description:
1395    
1396    Made a new set of bootfiles that goes with the current state of the
1397    repository.
1398    
1399    ----------------------------------------------------------------------
1400    Name: Matthias Blume
1401    Date: 2001/01/12 21:20:00 JST
1402    Tag: blume-20010112-sync
1403    Description:
1404    
1405    I am just flushing out some minor changes that had accumulated in
1406    my private branch in order to sync with the main tree.  (This is
1407    mainly because I had CVS trouble when trying to merge _into_ my
1408    private branch.)
1409    
1410    Most people should be completely unaffected by this.
1411    
1412    ----------------------------------------------------------------------
1413    Name: Allen Leung
1414    Date: Thu Jan 11 21:03:00 EST 2001
1415    Tag: leunga-20010111-labexp=mltree
1416    Description:
1417    
1418    1.  Removed the type LabelExp and replace it by MLTree.
1419    2.  Rewritten mltree-simplify with the pattern matcher tool.
1420    3.  There were some bugs in alpha code generator which would break
1421        64-bit code generation.
1422    4.  Redo the tools to generate code with the
1423    5.  The CM files in MLRISC (and in src/system/smlnj/MLRISC)
1424        are now generated by perl scripts.
1425    
1426    ----------------------------------------------------------------------
1427    Name: Matthias Blume
1428    Date: 2001/01/10 21:55:00 JST
1429    Tag: blume-20010110-rcc
1430    Description:
1431    
1432    The RCC stuff now seems to work (but only on the x86).
1433    This required hacking of the c-calls interface (and -implementation) in
1434    MLRISC.
1435    
1436    Normal compiler users should be unaffected.
1437    
1438    ----------------------------------------------------------------------
1439    Name: Matthias Blume
1440    Date: 2001/01/09 01:20:00 JST
1441    Tag: blume-20010109-rcc
1442    Description:
1443    
1444    This is a fairly big patch, flushing out a large number of pending
1445    changes that I made to my development copy over the last couple of days.
1446    
1447    Of practical relevance at this moment is a workaround for a pickling
1448    bug that Allen ran into the other day.  The cause of the bug itself is
1449    still unknown and it might be hard to fix it properly, but the
1450    workaround has some merits of its own (namely somewhat reducing pickling
1451    overhead for certain libraries).  Therefore, I think this solution should
1452    be satisfactory at this time.
1453    
1454    The rest of the changes (i.e., the vast majority) has to do with my
1455    ongoing efforts of providing direct support for C function calls from
1456    ML.  At the moment there is a new primop "RAW_CCALL", typing magic
1457    in types/cproto.sml (invoked from FLINT/trans/translate.sml), a new
1458    case in the FLINT CPS datatype (RCC), changes to cps/convert.sml to
1459    translate uses of RAW_CCALL into RCC, and changes to mlriscGen.sml to
1460    handle RCC.
1461    
1462    The last part (the changes to mlriscGen.sml) are still known to be
1463    wrong on the x86 and not implemented on all other architectures.  But
1464    the infrastructure is in place. I had to change a few functor
1465    signatures in the backend to be able to route the CCalls interface
1466    from MLRISC there, and I had to specialize the mltree type (on the
1467    x86) to include the necessary extensions. (The extensions themselves
1468    were already there and redy to go in MLRISC/x86).
1469    
1470    Everything should be very happy as soon as someone helps me with
1471    mlriscGen.sml...
1472    
1473    In any case, nothing of this should matter to anyone as long as the
1474    new primop is not being used (which is going to be the case unless you
1475    find it where I hid it :). The rest of the compiler is completely
1476    unaffected.
1477    
1478    ----------------------------------------------------------------------
1479    Name: Matthias Blume
1480    Date: 2001/01/05 00:30:00 JST
1481    Tag: blume-20010105-primops
1482    Description:
1483    
1484    Added some experimental support for work that I am doing right now.
1485    These changes mostly concern added primops, but there is also a new
1486    experimental C library in the runtime system (but currently not enabled
1487    anywhere except on Linux/X86).
1488    
1489    In the course of adding primops (and playing with them), I discovered that
1490    Zhong's INL_PRIM hack (no type info for certain primops) was, in fact, badly
1491    broken.  (Zhong was very right he labeled this stuff as "major gross hack".)
1492    To recover, I made type information in INL_PRIM mandatory and changed
1493    prim.sml as well as built-in.sml accordingly.  The InLine structure now
1494    has complete, correct type information (i.e., no bottom types).
1495    
1496    Since all these changes mean that we need new binfiles, I also bumped the
1497    version number to 110.32.1.
1498    
1499    ----------------------------------------------------------------------
1500    Name: Matthias Blume
1501    Date: 2000/12/30 22:10:00 JST
1502    Tag: blume-20001230-various
1503    Description:
1504    
1505    Added proxy libraries for MLRISC and let MLRISC libraries refer
1506    to each other using path anchors.  (See CM manual for explanation.)
1507    
1508    Updated CM documentation.
1509    
1510    Fixed some bugs in CM.
1511    
1512    Implemented "proxy" libraries (= syntactic sugar for CM).
1513    
1514    Added "-quiet" option to makeml and changed runtime system accordingly.
1515    
1516    Added cleanup handler for exportML to reset timers and compiler stats.
1517    
1518    ----------------------------------------------------------------------
1519    Name: Lal George
1520    Date: 2000/12/22 22:22:58 EST 2000
1521    Tag: Release_110_32
1522    Description:
1523    
1524            Infinite precision used throughout MLRISC.
1525            see MLRISC/mltree/machine-int.sig
1526    
1527    ----------------------------------------------------------------------
1528    Name: Matthias Blume
1529    Date: 2000/12/22 23:16:00 JST
1530    Tag: blume-20001222-warn
1531    Description:
1532    
1533    Corrected wording and formatting of some CM warning message which I
1534    broke in my previous patch.
1535    
1536    ----------------------------------------------------------------------
1537    Name: Matthias Blume
1538    Date: 2000/12/22 21:20:00 JST
1539    Tag: blume-20001222-anchorenv
1540    Description:
1541    
1542    Fixed CM's handling of anchor environments in connection with CMB.make.
1543    
1544    ----------------------------------------------------------------------
1545    Name: Matthias Blume
1546    Date: 2000/12/22 13:15:00 JST
1547    Tag: blume-20001222-cleanup
1548    Description:
1549    
1550    Removed src/cm/ffi which does not (and did not) belong here.
1551    
1552    ----------------------------------------------------------------------
1553    Name: Matthias Blume
1554    Date: 2000/12/21 23:55:00 JST
1555    Tag: blume-20001221-exn
1556    Description:
1557    
1558    Probably most important: CM no longer silently swallows all exceptions
1559    in the compiler.
1560    Plus: some other minor CM changes.  For example, CM now reports some
1561    sizes for generated binfiles (code, data, envpickle, lambdapickle).
1562    
1563    ----------------------------------------------------------------------
1564    Name: Matthias Blume
1565    Date: 2000/12/15 00:01:05 JST
1566    Tag: blume-20001215-dirtool
1567    Description:
1568    
1569    - "dir" tool added.
1570    - improvements and cleanup to Tools structure
1571    - documentation updates
1572    
1573    ----------------------------------------------------------------------
1574    Name: Allen Leung
1575    Date: Thu Dec 14 03:45:24 EST 2000
1576    Description:
1577    Tag:  leunga-20001214-int-inf
1578    Description:
1579    
1580       In IntInf, added these standard functions, which are missing from our
1581    implementation:
1582    
1583        andb : int * int -> int
1584        xorb : int * int -> int
1585        orb  : int * int -> int
1586        notb : int -> int
1587         <<   : int * word -> int
1588        ~>>  : int * word -> int
1589    
1590       Not tested, I hope they are correct.
1591    
1592    ----------------------------------------------------------------------
1593    Name: Allen Leung
1594    Date: Fri Dec  8 19:23:26 EST 2000
1595    Description:
1596    Tag:  leunga-20001208-nowhere
1597    Description:
1598    
1599      Slight improvements to the 'nowhere' tool to handle OR-patterns,
1600    to generate better error messages etc.  Plus a brief manual.
1601    
1602    ----------------------------------------------------------------------
1603    Name: Lal George
1604    Date: 2000/12/08 09:54:02 EST 2000
1605    Tag: Release_110_31
1606    Description:
1607    
1608    - Version 110.31
1609    ----------------------------------------------------------------------
1610    Name: Allen Leung
1611    Date: Thu Dec  7 22:01:04 EST 2000
1612    Tag:  leunga-20001207-cell-monster-hack
1613    Description:
1614    
1615    Major MLRISC internal changes.  Affect all clients.
1616    Summary:
1617    
1618    1.  Type CELLS.cell = int is now replaced by a datatype.
1619        As a result, the old regmap is now gone.  Almost all interfaces
1620        in MLRISC change as a consequence.
1621    
1622    2.  A new brand version of machine description tool (v3.0) that generates
1623        modules expecting the new interface.  The old version is removed.
1624    
1625    3.  The RA interface has been further abstracted into two new functors.
1626        RISC_RA and X86RA.  These functors have much simpler interfaces.
1627        [See also directory MLRISC/demo.]
1628    
1629    4.  Some other new source->source code generation tools are available:
1630    
1631        a. MLRISC/Tools/RewriteGen -- generate rewriters from rules.
1632        b. MLRISC/Tools/WhereGen -- expands conditional pattern matching rules.
1633           I use this tool to generate the peephole optimizers---with the new
1634           cell type changes, peephole rules are becoming difficult to write
1635           without conditional pattern matching.
1636    
1637    5.  More Intmap -> IntHashTable change.  Previous changes by Matthias didn't
1638        cover the entire MLRISC source tree so many things broke.
1639    
1640    6.  CM files have been moved to the subdirectory MLRISC/cm.
1641        They are moved because there are a lot of them and they clutter up the
1642        root dir.
1643    
1644    7.  More detailed documentation to come...
1645    
1646        NOTE: To rebuild from 110.30 (ftp distribution), you'll have to do
1647        a makeml -rebuild first.  This is because of other other
1648        changes that Matthias has made (see below).
1649    
1650    
1651    ----------------------------------------------------------------------
1652    Name: Matthias Blume
1653    Date: 2000/11/30 23:12:00 JST
1654    Tag: blume-20001130-filereorg
1655    Description:
1656    
1657    Some manual updates and some file reorganizations in CM.
1658    
1659    ----------------------------------------------------------------------
1660    Name: Matthias Blume
1661    Date: 2000/11/24 17:45:00 JST
1662    Tag: blume-20001124-link
1663    Description:
1664    
1665    Drastically improved link traversal code for the case that the dynamic
1666    value was already loaded at bootstrap time.  As a result, CM and CMB
1667    now both load blazingly fast -- even on a very slow machine.  Also,
1668    memory consumption has been further reduced by this.
1669    
1670    Warning: The format of the PIDMAP file has changed.  THerefore, to
1671    bootstrap you have to do this:
1672    
1673    1. Run CMB.make
1674    2. Make a symbolic link for the boot directory:
1675         ln -s sml.boot.ARCH-OS xxx
1676    3. "Rebuild" the boot directory:
1677         ./makeml -boot xxx -rebuild sml ; rm xxx
1678    4. Boot normally:
1679          ./makeml
1680    
1681    ----------------------------------------------------------------------
1682    Name: Matthias Blume
1683    Date: 2000/11/21 21:20:00 JST
1684    Tag: blume-20001121-tools
1685    Description:
1686    
1687    Continued hacking on autoloading problem -- with success this time.
1688    Also changed tool-plugin mechanism.  See new CM manual.
1689    
1690    ----------------------------------------------------------------------
1691    Name: Matthias Blume
1692    Date: 2000/11/19 14:30:00 JST
1693    Tag:  blume-20001119-autoload
1694    Description:
1695    
1696    Some hacking to make autoloading faster.  Success for CMB, no success
1697    so far for CM.  There is a reduced structure CM' that autoloads faster.
1698    (This is a temporary, non-documented hack to be eliminated again when
1699    the general problem is solved.)
1700    
1701    ----------------------------------------------------------------------
1702    Name: Matthias Blume
1703    Date: 2000/11/17 14:10:00 JST
1704    Tag: blume-20001117-pickle-lib
1705    Description:
1706    
1707    1. Eliminated comp-lib.cm
1708    2. Made pickle-lib.cm
1709    3. Eliminated all uses of intset.sml (from comp-lib.cm)
1710    4. Replaced all uses of intmap.{sig,sml} (from comp-lib.cm) with
1711       equivalent constructs from smlnj-lib.cm (INtHashTable).
1712    5. Point 4. also goes for those uses of intmap.* in MLRISC.
1713       Duplicated intmap modules thrown out.
1714    6. Hunted down all duplicated SCC code and replaced it with
1715       equivalent stuff (GraphSCCFn from smlnj-lib.cm).
1716    7. Rewrote Feedback module.
1717    8. Moved sortedlist.sml into viscomp-lib.cm.  Eventually it
1718       should be thrown out and equivalent modules from smlnj-lib.cm
1719       should be used (IntRedBlackSet, IntListSet, ...).
1720    
1721    Confirmed that compiler compiles to fixpoint.
1722    
1723    ----------------------------------------------------------------------
1724    Name: Allen Leung
1725    Date: 2000/11/10 18:00:00
1726    Tag: leunga-20001110-new-x86-fp
1727    
1728    A new x86 floating point code generator has been added.
1729    By default this is turned off.  To turn this on, do:
1730    
1731        CM.autoload "$smlnj/compiler.cm";
1732        Compiler.Control.MLRISC.getFlag "x86-fast-fp" := true;
1733    
1734    Changes:
1735    
1736    1.  Changed FTAN to FPTAN so that the assembly output is correct.
1737    2.  Changed the extension callback for FTANGENT to generate:
1738    
1739              fptan
1740              fstp  %st(0)
1741        instead of
1742              fptan
1743              fstpl ftempmem
1744    
1745    3.  Numerous assembly fixes for x86.
1746    
1747    5.  Cleaned up the machine code output module x86/x86MC.sml and added
1748        support for a whole bunch of instructions and addressing modes:
1749    
1750          fadd/fsub/fsubr/fmul/fdiv/fdivr  %st, %st(n)
1751          faddp/fsubp/fsubrp/fmulp/fdivp/fdivrp  %st, %st(n)
1752          fadd/fsub/fsubr/fmul/fdiv/fdivr  %st(n), %st
1753          fiadd/fisub/fisubr/fimul/fidiv/fidivr mem
1754          fxch %st(n)
1755          fld %st(n)
1756          fst %st(n)
1757          fst mem
1758          fstp %st(n)
1759          fucom %st(n)
1760          fucomp %st(n)
1761    
1762        All these are now generated when the fast fp mode is turned on.
1763    
1764    6.  Removed the dedicated registers %st(0), ..., %st(7) from X86CpsRegs
1765    
1766    ----------------------------------------------------------------------
1767    Name: Matthias Blume
1768    Date: 2000/11/09 11:20:00 JST
1769    Tag: blume-20001109-scc
1770    Description:
1771    
1772    Eliminated some code duplication:
1773    
1774    1. Added "where" clause to GraphSCCFn in SML/NJ Library.
1775       (Otherwise the functor is useless.)
1776    2. Used GraphSCCFn where SCCUtilFun was used previously.
1777    3. Got rid of SCCUtilFun (in comp-lib.cm).
1778    
1779    ----------------------------------------------------------------------
1780    Name: Lal George
1781    Date: 2000/11/06 09:02:21 EST 2000
1782    Tag: Release_110_30
1783    Description:
1784    
1785    - Version 110.30
1786    ----------------------------------------------------------------------
1787    Name: Matthias Blume
1788    Date: 2000/11/04 14:45:00
1789    Tag: blume-20001104-mlbuild
1790    Description:
1791    
1792    - Made ml-build faster on startup.
1793    - Documentation fixes.
1794    
1795    ----------------------------------------------------------------------
1796    Name: Matthias Blume
1797    Date: 2000/11/02 17:00:00 JST
1798    Tag: blume-20001102-condcomp
1799    Description:
1800    
1801    - Small tweaks to pickler -- new BOOTFILES!
1802    - Version bumped to 110.29.2.
1803    - Added conditional compilation facility to init.cmi (see comment there).
1804    ----------------------------------------------------------------------
1805    Name: Allen Leung
1806    Date: 2000/10/23 19:31:00
1807    Tag: leunga-20001023-demo-ra
1808    
1809    1. Minor RA changes that improves spilling on x86 (affects Moby and C-- only)
1810    2. Test programs for the graph library updated
1811    3. Some new MLRISC demo programs added
1812    
1813    ----------------------------------------------------------------------
1814    Name: Matthias Blume
1815    Date: 2000/08/31 22:15:00 JST
1816    Tag: blume-20001017-errmsg
1817    Description:
1818    
1819    More error message grief: Where there used to be no messages, there
1820    now were some that had bogus error regions.  Fixed.
1821    
1822    ----------------------------------------------------------------------
1823    Name: Matthias Blume
1824    Date: 2000/08/31 17:30:00 JST
1825    Tag: blume-20001017-v110p29p1
1826    Description:
1827    
1828    I made a version 110.29.1 with new bootfiles.
1829    
1830    Changes:  Modified pickler/unpickler for faster and leaner unpickling.
1831              CM documentation changes and a small bugfix in CM's error reporting.
1832    
1833    ----------------------------------------------------------------------
1834    Name: Lal George
1835    Date: 2000/09/27 14:42:35 EDT
1836    Tag: george-20000927-nodestatus
1837    Description:
1838    
1839    Changed the type of the nodestatus, so that:
1840    
1841            SPILLED(~1)             is now SPILLED
1842            SPILLED(m) where m>=0   is now MEMREG(m)
1843            SPILLED(s) where s<~1   is now SPILL_LOC(~s)
1844    
1845    ----------------------------------------------------------------------
1846    Name: Matthias Blume
1847    Date: 2000/09/07 14:45:00 JST
1848    Tag: blume-20000907-cmerrmsg
1849    Description:
1850    
1851    Small tweak to CM to avoid getting ML syntax error messages twice.
1852    
1853    ----------------------------------------------------------------------
1854    Name: Matthias Blume
1855    Date: 2000/08/31 18:00:00 JST
1856    Tag: blume-20000831-cvsbootfiles
1857    Description:
1858    
1859    New URL for boot files (because the 110.29 files on the BL server do
1860    now work correctly with my updated install scripts for yacc and lex).
1861    
1862    ----------------------------------------------------------------------
1863    Name: Matthias Blume
1864    Date: 2000/08/08 12:33:00 JST
1865    Tag: blume-20000808-manual
1866    Description:
1867    
1868    Tiny update to CM manual.
1869    
1870    ----------------------------------------------------------------------
1871    Name: Allen Leung
1872    Date: 2000/08/7 19:31:00
1873    Tag: leunga-20000807-a-whole-bunch-of-stuff
1874    
1875      Moby, C--, SSA, x86, machine descriptions etc.  Should only affect C--
1876    and Mobdy.
1877    
1878    1.  x86
1879    
1880       a.  Fixes to peephole module by John and Dan.
1881       b.  Assembly fix to SETcc by Allen.
1882       c.  Fix to c-call by John.
1883       d.  Fix to spilling by John.  (This one deals with the missing FSTPT case)
1884       e.  Instruction selection optimization to SETcc as suggested by John.
1885    
1886           For example,
1887    
1888            MV(32, x, COND(32, CMP(32, LT, a, b), LI 1, LI 0))
1889    
1890           should generate:
1891    
1892            MOVL a, x
1893            SUBL b, x
1894            SHRL 31, x
1895    
1896    2.  IR stuff
1897    
1898         A bunch of new DJ-graph related algorithms added.  These
1899         speed up SSA construction.
1900    
1901    3.  SSA + Scheduling
1902    
1903         Added code for SSA and scheduling to the repository
1904    
1905    ----------------------------------------------------------------------
1906    Name: Lal George
1907    Date: 2000/07/27 11:53:14 EDT
1908    
1909    Tag: lal-20000727-linux-ppc
1910    Description:
1911    
1912     Made changes to support Linux PPC.
1913     p.s. I have confirmation that the 110.29 boot files work fine.
1914    
1915    ----------------------------------------------------------------------
1916    Name: Matthias Blume
1917    Date: 2000/07/27 17:40:00 JST
1918    Tag: blume-20000727-scripts
1919    Description:
1920    
1921    !!!! WARNING !!!!
1922    You must recompile the runtime system!
1923    !!!! WARNING !!!!
1924    
1925    This is basically another round of script-enhancements:
1926    
1927    1. sml, ml-build, and ml-makedepend accept options -D and -U to define
1928       and undefine CM preprocessor symbols.
1929    
1930    2. ml-build avoids generating a new heap image if it finds that the
1931       existing one is still ok.  (The condition is that no ML file had to
1932       be recompiled and all ML files are found to be older that the heap
1933       file.)
1934    
1935       To make this work smoothly, I also hacked the runtime system as
1936       well as SMLofNJ.SysInfo to get access to the heap image suffix
1937       (.sparc-solaris, ...) that is currently being used.
1938    
1939       Moreover, the signature of CM.mk_standalone has changed.  See the
1940       CM manual.
1941    
1942    3. ml-makedepend accepts additional options -n, -a, and -o.  (See the
1943       CM manual for details.)
1944    
1945    4. More CM manual updates:
1946        - all of the above has been documented.
1947        - there is now a section describing the (CM-related) command line
1948          arguments that are accepted by the "sml" command
1949    
1950    ----------------------------------------------------------------------
1951    Name: Matthias Blume
1952    Date: 2000/07/25 16:20:00 JST
1953    Tag: blume-20000725-makedepend
1954    Description:
1955    
1956    Added a script called ml-makedepend.  This can be used in makefiles
1957    for Unix' make in a way very similar to the "makedepend" command for
1958    C.
1959    
1960    The script internally uses function CM.sources.
1961    
1962    Synopsis:
1963    
1964        ml-makedepend [-f makefile] cmfile targetname
1965    
1966    The default for the makefile is "makefile" (or "Makefile" should
1967    "makefile" not exist).
1968    
1969    ml-makedepend adds a cmfile/targetname-specific section to this
1970    makefile (after removing the previous version of this section).  The
1971    section contains a single dependency specification with targetname on
1972    the LHS (targetname is an arbitrary name), and a list of files derived
1973    from the cmfile on the RHS.  Some of the files on the RHS are
1974    ARCH/OPSYS-specific.  Therefore, ml-makedepend inserts references to
1975    "make" variables $(ARCH) and $(OPSYS) in place of the corresponding
1976    path names.  The makefile writer is responsible for making sure that
1977    these variables have correct at the time "make" is invoked.
1978    
1979    ----------------------------------------------------------------------
1980    Name: Matthias Blume
1981    Date: 2000/07/22 23:30:00 JST
1982    Tag: blume-20000722-urlupdate
1983    Description:
1984    
1985    Changed BOOT and config/srcarchiveurl to point to BL server:
1986    
1987        ftp://ftp.research.bell-labs.com/dist/smlnj/working/110.29/
1988    
1989    ----------------------------------------------------------------------
1990    Name: Matthias Blume
1991    Date: 2000/07/18 18:00:00 JST
1992    Tag: blume-20000718-Version_110_29
1993    Description:
1994    
1995    1. Updated src/compiler/TopLevel/main/version.sml to version 110.29
1996    
1997    2. Updated config/version to 110.29
1998    
1999    3. Updated config/srcarchiveurl
2000    
2001    3. New boot files!
2002       ftp://ftp.cs.princeton.edu/pub/people/blume/sml/110.29-autofetch
2003    
2004    ----------------------------------------------------------------------
2005    Name: Matthias Blume
2006    Date: 2000/07/11 13:58:00 JST
2007    Tag: blume-20000711-doctypo
2008    Description:
2009    
2010    Fixed a few typos in CM manual.
2011    
2012    ----------------------------------------------------------------------
2013    Name: Allen Leung
2014    Date: 2000/06/15 00:38:00
2015    Tag: leunga-20000704-sparc-x86
2016    
2017    1. x86 peephole improvement sp += k; sp -= k => nop  [from John]
2018    2. fix to x86 RET bug [found by Dan Grossman]
2019    3. sparc assembly bug fix for ticc instructions [found by Fermin]
2020    
2021       Affects c-- and moby only
2022    
2023    ----------------------------------------------------------------------
2024    Name: Matthias Blume
2025    Date: 2000/07/04 15:26:00
2026    Tag: blume-20000704-trigger
2027    Description:
2028    
2029    1. Improvements to CM manual.
2030    2. SMLofNJ.Internals.BTrace.trigger reinstated as an alternative way
2031       of getting a back-trace.  The function, when called, raises an
2032       internal exception which explicitly carries the full back-trace history,
2033       so it is unaffected by any intervening handle-raise pairs ("trivial"
2034       or not).  The interactive loop will print that history once it arrives
2035       at top level.
2036       Short of having all exceptions implicitly carry the full history, the
2037       recommended way of using this facility is:
2038         - compile your program with instrumentation "on"
2039         - run it, when it raises an exception, look at the history
2040         - if the history is "cut off" because of some handler, go and modify
2041           your program so that it explicitly calls BTrace.trigger
2042         - recompile (still instrumented), and rerun; look at the full history
2043    
2044    ----------------------------------------------------------------------
2045    Name: Matthias Blume
2046    Date: 2000/07/03 15:36:00 JST
2047    Tag: blume-20000702-manual
2048    Description:
2049    
2050    Small corrections and updates to CM manual.
2051    
2052    ----------------------------------------------------------------------
2053    Name: Matthias Blume
2054    Date: 2000/06/29 16:04:00 JST
2055    Tag: blume-20000629-yacctool
2056    Description:
2057    
2058    Changes:
2059    
2060    1. Class "mlyacc" now takes separate arguments to pass options to
2061       generated .sml- and .sig-files independently.
2062    2. Corresponding CM manual updates.
2063    3. BTrace module now also reports call sites.  (However, for loop clusters
2064       it only shows from where the cluster was entered.)  There are associated
2065       modifications to core.sml, internals.{sig,sml}, btrace.sml, and btimp.sml.
2066    
2067    ----------------------------------------------------------------------
2068    Name: Matthias Blume
2069    Date: 2000/06/27 16:51:00 JST
2070    Tag: blume-20000627-noweb
2071    Description:
2072    
2073    Changes:
2074    
2075     1. Implemented "subdir" and "witness" options for noweb tool.
2076        This caused some slight internal changes in CM's tool implementation.
2077     2. Fixed bug in "tool plugin" mechanism.  This is essentially cleaning
2078        some remaining issues from earlier path anchor changes.
2079     3. Updated CM manual accordingly.
2080    
2081     4. Changed implementation of back-tracing so that I now consider it
2082        ready for prime-time.
2083    
2084        In particular, you don't have to explicitly trigger the back-trace
2085        anymore.  Instead, if you are running BTrace-instrumented code and
2086        there is an uncaught exception (regardless of whether or not it was
2087        raised in instrumented code), the top-level evalloop will print
2088        the back-trace.
2089    
2090        Features:
2091    
2092          - Instrumented and uninstrumented code work together seemlessly.
2093            (Of course, uninstrumented code is never mentioned in actual
2094             back-traces.)
2095    
2096          - Asymptotic time- and space-complexity of instrumented code is
2097            equal to that of uninstrumented code.  (This means that
2098            tail-recursion is preserved by the instrumentation phase.)
2099    
2100          - Modules whose code has been instrumented in different sessions
2101            work together without problem.
2102    
2103          - There is no penalty whatsoever on uninstrumented code.
2104    
2105          - There is no penalty on "raise" expressions, even in
2106            instrumented code.
2107    
2108        A potential bug (or perhaps it is a feature, too):
2109    
2110          A back-trace reaches no further than the outermost instrumented
2111          non-trivial "raise".  Here, a "trivial" raise is one that is the
2112          sole RHS of a "handle" rule.  Thus, back-traces reach trough
2113    
2114               <exp> handle e => raise e
2115    
2116          and even
2117    
2118               <exp> handle Foo => raise Bar
2119    
2120          and, of course, through
2121    
2122               <exp> handle Foo => ...
2123    
2124         if the exception was not Foo.
2125    
2126         Back-traces always reach right through any un-instrumented code
2127         including any of its "handle" expressions, trivial or not.
2128    
2129       To try this out, do the following:
2130    
2131         - Erase all existing binfiles for your program.
2132           (You may keep binfiles for those modules where you think you
2133            definitely don't need back-tracing.)
2134         - Turn on back-trace instrumentation:
2135              SMLofNJ.Internals.BTrace.mode (SOME true);
2136         - Recompile your program.  (I.e., run "CM.make" or "use".)
2137         - You may now turn instrumentation off again (if you want):
2138              SMLofNJ.Internals.BTrace.mode (SOME false);
2139         - Run your program as usual.  If it raises an exception that
2140           reaches the interactive toplevel, then a back-trace will
2141           automatically be printed.  After that, the toplevel loop
2142           will print the exception history as usual.
2143    
2144    ----------------------------------------------------------------------
2145    Name: Matthias Blume
2146    Date: 2000/06/26 09:56:46 JST
2147    Tag: blume-20000626-setup
2148    Description:
2149    
2150    CM: - setup-parameter to "sml" added; this can be used to run arbitrary
2151          ML code before and after compiling a file (e.g., to set compiler
2152          flags)
2153    
2154    Compiler: - improved btrace API (in core.sml, internals.{sig,sml})
2155              - associated changes to btrace.sml (BTrace instrumentation pass)
2156              - cleaner implementation of btimp.sml (BTrace tracing and report
2157                module)
2158    
2159    CM manual: * new path encoding documented
2160               * description of setup-parameter to "sml" added
2161    
2162    The biggest user-visible change to back-tracing is that it is no
2163    longer necessary to compile all traced modules within the same
2164    session.  (This was a real limitation.)
2165    
2166    ----------------------------------------------------------------------
2167    Name: Matthias Blume
2168    Date: 2000/06/24 12:40:00 JST
2169    Tag: blume-20000624-startup
2170    Description:
2171    
2172    Fixes startup slowdown problem.  (I was calling SrcPath.sync a _tad_
2173    bit too often -- to put it mildly. :)
2174    
2175    ----------------------------------------------------------------------
2176    Name: Matthias Blume
2177    Date: 2000/06/23 18:20:00 JST
2178    Tag: blume-20000623-btrace
2179    Description:
2180    
2181    This updates adds a backtrace facility to aid programmers in debugging
2182    their programs.  This involves the following changes:
2183    
2184    1. Module system/smlnj/init/core.sml (structure _Core) now has hooks for
2185       keeping track of the current call stack.  When programs are compiled
2186       in a special mode, the compiler will insert calls to these hooks
2187       into the user program.
2188       "Hook" means that it is possible for different implementations of
2189       back-tracing to register themselves (at different times).
2190    
2191    2. compiler/MiscUtil/profile/btrace.sml implements the annotation phase
2192       as an Absyn.dec->Absyn.dec rewrite.  Normally this phase is turned off.
2193       It can be turned on using this call:
2194         SMLofNJ.Internals.BTrace.mode (SOME true);
2195       Turning it off again:
2196         SMLofNJ.Internals.BTrace.mode (SOME false);
2197       Querying the current status:
2198         SMLofNJ.Internals.BTrace.mode NONE;
2199       Annotated programs are about twice as big as normal ones, and they
2200       run a factor of 2 to 4 slower with a dummy back-trace plugin (one
2201       where all hooks do nothing).  The slowdown with a plugin that is
2202       actually useful (such as the one supplied by default) is even greater,
2203       but in the case of the default plugin it is still only an constant
2204       factor (amortized).
2205    
2206    3. system/Basis/Implementation/NJ/internals.{sig,sml} have been augmented
2207       with a sub-structure BTrace for controlling back-tracing.  In particular,
2208       the above-mentioned function "mode" controls whether the annotation
2209       phase is invoked by the compiler.  Another important function is
2210       "trigger": when called it aborts the current execution and causes
2211       the top-level loop to print a full back-trace.
2212    
2213    4. compiler/MiscUtil/profile/btimp.sml is the current default plugin
2214       for back-tracing.  It keeps track of the dynamic call stack and in
2215       addition to that it keeps a partial history at each "level" of that
2216       stack.  For example, if a tail-calls b, b tail-calls c, and c tail-calls
2217       d and b (at separate times, dynamically), then the report will show:
2218    
2219       GOTO   d
2220             /c
2221       GOTO  \b
2222       CALL   a
2223    
2224       This shows that there was an initial non-tail call of a, then a
2225       tail-call to b or c, looping behavior in a cluster of functions that
2226       consist of b and c, and then a goto from that cluster (i.e., either from
2227       b or from c) to d.
2228    
2229       Note that (depending on the user program) the amount of information
2230       that the back-trace module has to keep track of at each level is bounded
2231       by a constant.  Thus, the whole implementation has the same asymptotical
2232       complexity as the original program (both in space and in time).
2233    
2234    5. compiler/TopLevel/interact/evalloop.sml has been modified to
2235       handle the special exception SMLofNJ.Internals.BTrace.BTrace
2236       which is raised by the "trigger" function mentioned above.
2237    
2238    Notes on usage:
2239    
2240    - Annotated code works well together with unannotated code:
2241    Unannotated calls simply do not show up at all in the backtrace.
2242    
2243    - It is not a good idea to let modules that were annotated during
2244    different sessions run at the same time.  This is because the compiler
2245    chooses small integers to identify individual functions, and there
2246    will be clashes if different modules were compiled in separate sessions.
2247    (Nothing will crash, and you will even be told about the clashes, but
2248    back-trace information will in general not be useful.)
2249    
2250    - Back-tracing can be confused by callcc and capture.
2251    
2252    - The only way of getting a back-trace right now is to explicitly
2253    invoke the "trigger" function from your user program.  Eventually, we
2254    should make every exception carry back-trace information (if
2255    available).  But since this creates more overhead at "raise"-time
2256    (similar to the current exnHistory overhead), I have not yet
2257    implemented this.  (The implementation will be rather easy.)  With
2258    exceptions carrying back-trace information, this facility will be even
2259    more useful because users don't need to modify their programs...
2260    
2261    - While it is possible to compile the compiler with back-trace
2262    annotations turned on (I did it to get some confidence in
2263    correctness), you must make absolutely sure that core.sml and
2264    btimp.sml are compiled WITHOUT annotation!  (core.sml cannot actually
2265    be compiled with annotation because there is no core access yet, but
2266    if you compile btimp.sml with annotation, then the system will go into
2267    an infinite recursion and crash.)
2268    Since CM currently does not know about BTrace, the only way to turn
2269    annotations on and off for different modules of the compiler is to
2270    interrupt CMB.make, change the settings, and re-invoke it.  Of course,
2271    this is awkward and clumsy.
2272    
2273    Sample sessions:
2274    
2275    Standard ML of New Jersey v110.28.1 [FLINT v1.5], June 5, 2000
2276    - SMLofNJ.Internals.BTrace.mode (SOME true);
2277    [autoloading]
2278    [autoloading done]
2279    val it = false : bool
2280    - structure X = struct
2281    -     fun main n = let
2282    -         fun a (x, 0) = d x
2283    -           | a (x, n) = b (x, n - 1)
2284    -         and b (x, n) = c (x, n)
2285    -         and c (x, n) = a (x, n)
2286    -         and d x = e (x, 3)
2287    -         and e (x, 0) = f x
2288    -           | e (x, n) = e (x, n - 1)
2289    -         and f 0 = SMLofNJ.Internals.BTrace.trigger ()
2290    -           | f n = n * g (n - 1)
2291    -         and g n = a (n, 3)
2292    -     in
2293    -         f n
2294    -     end
2295    - end;
2296    structure X : sig val main : int -> int end
2297    - X.main 3;
2298    *** BACK-TRACE ***
2299    GOTO   stdIn:4.2-13.20: X.main[2].f
2300    GOTO-( stdIn:4.2-13.20: X.main[2].e
2301    GOTO   stdIn:4.2-13.20: X.main[2].d
2302         / stdIn:4.2-13.20: X.main[2].a
2303         | stdIn:4.2-13.20: X.main[2].b
2304    GOTO-\ stdIn:4.2-13.20: X.main[2].c
2305    CALL   stdIn:4.2-13.20: X.main[2].g
2306    GOTO   stdIn:4.2-13.20: X.main[2].f
2307    GOTO-( stdIn:4.2-13.20: X.main[2].e
2308    GOTO   stdIn:4.2-13.20: X.main[2].d
2309         / stdIn:4.2-13.20: X.main[2].a
2310         | stdIn:4.2-13.20: X.main[2].b
2311    GOTO-\ stdIn:4.2-13.20: X.main[2].c
2312    CALL   stdIn:4.2-13.20: X.main[2].g
2313    GOTO   stdIn:4.2-13.20: X.main[2].f
2314    GOTO-( stdIn:4.2-13.20: X.main[2].e
2315    GOTO   stdIn:4.2-13.20: X.main[2].d
2316         / stdIn:4.2-13.20: X.main[2].a
2317         | stdIn:4.2-13.20: X.main[2].b
2318    GOTO-\ stdIn:4.2-13.20: X.main[2].c
2319    CALL   stdIn:4.2-13.20: X.main[2].g
2320    GOTO   stdIn:4.2-13.20: X.main[2].f
2321    CALL   stdIn:2.15-17.4: X.main[2]
2322    -
2323    
2324    (Note that because of a FLINt bug the above code currently does not
2325    compile without BTrace turned on.)
2326    
2327    Here is another example, using my modified Tiger compiler:
2328    
2329    Standard ML of New Jersey v110.28.1 [FLINT v1.5], June 5, 2000
2330    - SMLofNJ.Internals.BTrace.mode (SOME true);
2331    [autoloading]
2332    [autoloading done]
2333    val it = false : bool
2334    - CM.make "sources.cm";
2335    [autoloading]
2336    ...
2337    [autoloading done]
2338    [scanning sources.cm]
2339    [parsing (sources.cm):parse.sml]
2340    [creating directory CM/SKEL ...]
2341    [parsing (sources.cm):tiger.lex.sml]
2342    ...
2343    [wrote CM/sparc-unix/semant.sml]
2344    [compiling (sources.cm):main.sml]
2345    [wrote CM/sparc-unix/main.sml]
2346    [New bindings added.]
2347    val it = true : bool
2348    - Main.compile ("../testcases/merge.tig", "foo.out");
2349    *** BACK-TRACE ***
2350    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trvar
2351    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
2352    CALL   lib/semant.sml:289.3-295.22: SemantFun[2].transExp.trexp.check[2]
2353    GOTO   lib/semant.sml:289.3-295.22: SemantFun[2].transExp.trexp.check[2]
2354    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
2355    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
2356    CALL   lib/semant.sml:488.3-505.6: SemantFun[2].transDec.trdec[2].transBody[2]
2357         / lib/semant.sml:411.65-543.8: SemantFun[2].transDec
2358    CALL-\ lib/semant.sml:413.2-540.9: SemantFun[2].transDec.trdec[2]
2359    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
2360    CALL   lib/semant.sml:8.52-558.4: SemantFun[2].transProg[2]
2361    CALL   main.sml:1.18-118.4: Main.compile[2]
2362    -
2363    
2364    ----------------------------------------------------------------------
2365    Name: Matthias Blumen
2366    Date: 2000/06/21 18:00:00 JST
2367    Tag: blume-20000621-manual
2368    Description:
2369    
2370    CM manual update: Path environments documented.
2371    
2372    ----------------------------------------------------------------------
2373    Name: Matthias Blume
2374    Date: 2000/06/19 13:40:00
2375    Tag: blume-20000619-manual
2376    Description:
2377    
2378    CM manual and system/README update.  This only covers the fact that
2379    there are no more implicit anchors.  (Path environments and the "bind"
2380    option to "cm" have yet to be documented.)
2381    
2382    ----------------------------------------------------------------------
2383    Name: Matthias Blume
2384    Date: 2000/06/19 11:05:00 JST
2385    Tag: blume-20000619-chdir-bugfix
2386    Description:
2387    
2388    Fixed a bug in new SrcPath module that sometimes led to a bad chDir call.
2389    
2390    ----------------------------------------------------------------------
2391    Name: Matthias Blume
2392    Date: 2000/06/18 22:00:10 JST
2393    Tag: blume-20000618-implicit-anchors-really-gone
2394    Description:
2395    
2396    I updates the previous HISTORY entry where I forgot to mention that
2397    implicit anchors are no longer with us.
2398    
2399    The current update also gets rid of the (now useless) controller
2400    CM.Control.implicit_anchors.
2401    
2402    ----------------------------------------------------------------------
2403    Name: Matthias Blume
2404    Date: 2000/06/16 17:30:00 JST
2405    Tag: blume-20000616-anchorenv
2406    Description:
2407    
2408    This patch implements the long anticipated (just kidding :) "anchor
2409    environment" mechanism.  In the course of doing this, I also
2410    re-implemented CM's internal "SrcPath" module from scratch.  The new
2411    one should be more robust in certain boundary cases.  In any case, it
2412    is a lot cleaner than its predecessor (IMHO).
2413    
2414    This time, although there is yet another boot file format change, I
2415    kept the unpickler backward-compatible.  As a result, no new bootfiles
2416    are necessary and bootstrapping is straightforward.  (You cannot read
2417    new bootfiles into an old system, but the other way around is no
2418    problem.)
2419    
2420    Visible changes:
2421    
2422    ** 0. Implicit path anchors (without the leading $-symbol) are no
2423    longer recognized at all. This means that such path names are not
2424    illegal either.  For example, the name basis.cm simply refers to a
2425    local file called "basis.cm" (i.e, the name is an ordinary path
2426    relative to .cm-files directory).  Or, to put it differently, only
2427    names that start with $ are anchored paths.
2428    
2429    ** 1. The $<singlearc> abbreviation for $/<singlearc> has finally
2430    vanished.
2431    
2432    John (Reppy) had critizised this as soon as I originally proposed and
2433    implemented it, but at that time I did not really deeply believe
2434    him. :) Now I came full-circle because I need the $<singlearc> syntax
2435    in another place where it cannot be seen as an abbreviation for
2436    $/<singlearc>.  To avoid the confusion, $<singlearc> now means what it
2437    seems to mean (i.e., it "expands" into the corresponding anchor
2438    value).
2439    
2440    However, when paths are used as members in CM description files, it
2441    continues to be true that there must be at least another arc after the
2442    anchor.  This is now enforced separately during semantic analysis
2443    (i.e., from a lexical/syntactical point of view, the notation is ok.)
2444    
2445    ** 2. The "cm" class now accepts an option "bind".  The option's value
2446    is a sub-option list of precisely two items -- one labeled "anchor"
2447    and the other one labeled "value".  As you might expect, "anchor" is
2448    used to specify an anchor name to be bound, and "value" specifies what
2449    the anchor is being bound to.
2450    
2451    The value must be a directory name and can be given in either standard
2452    syntax (including the possibility that it is itself an anchored path)
2453    or native syntax.
2454    
2455    Examples:
2456    
2457       foo.cm (bind:(anchor:bar value:$mystuff/bar))
2458       lib.cm (bind:(anchor:a value:"H:\\x\\y\\z"))  (* only works under windows *)
2459    
2460    and so on.
2461    
2462    The meaning of this is that the .cm-file will be processed with an
2463    augmented anchor environment where the given anchor(s) is/are bound to
2464    the given values(s).
2465    
2466    The rationale for having this feature is this: Suppose you are trying
2467    to use two different (already stable) libraries a.cm and b.cm (that
2468    you perhaps didn't write yourself).  Further, suppose each of these
2469    two libraries internally uses its own auxiliary library $aux/lib.cm.
2470    Normally you would now have a problem because the anchor "lib" can not
2471    be bound to more than one value globally.  Therefore, the project that
2472    uses both a.cm and b.cm must locally redirect the anchor to some other
2473    place:
2474    
2475       a.cm (bind:(anchor:lib value:/usr/lib/smlnj/a-stuff))
2476       b.cm (bind:(anchor:lib value:/usr/lib/smlnj/b-stuff))
2477    
2478    This hard-wires $lib/aux.cm to /usr/lib/smlnj/a-stuff/aux.cm or
2479    /usr/lib/smlnj/b-stuff/aux.cm, respectively.
2480    
2481    Hard-wiring path names is a bit inflexible (and CM will verbosely warn
2482    you when you do so at the time of CM.stabilize).  Therefore, you can
2483    also use an anchored path as the value:
2484    
2485      a.cm (bind:(anchor:lib value:$a-lib))
2486      b.cm (bind:(anchor:lib value:$b-lib))
2487    
2488    Now you can globally configure (using the usual CM.Anchor.anchor or
2489    pathconfig machinery) bindings for "a-lib" and "b-lib".  Since "lib"
2490    itself is always locally bound, setting it globally is no longer
2491    meaningful or necessary (but it does not hurt either).  In fact, "lib"
2492    can still be used as a global anchor for separate purposes.  As a
2493    matter of fact, one can locally define "lib" in terms of a global
2494    "lib":
2495    
2496      a.cm (bind:(anchor:lib value:$lib/a))
2497      b.cm (bind:(anchor:lib value:$lib/b))
2498    
2499    ** 3: The encoding of path names has changed.  This affects the way
2500    path names are shown in CM's progress report and also the internal
2501    protocol encoding used for parallel make.
2502    
2503    The encoding now uses one or more ':'-separated segments.  Each
2504    segments corresponds to a file that has been specified relative to the
2505    file given by its preceding segment.  The first segment is either
2506    relative to the CWD, absolute, or anchored.  Each segment itself is
2507    basically a Unix pathname; all segments but the first are relative.
2508    
2509    Example:
2510    
2511       $foo/bar/baz.cm:a/b/c.sml
2512    
2513    This path denotes the file bar/a/b/c.sml relative to the directory
2514    denoted by anchor "foo".  Notice that the encoding also includes
2515    baz.cm which is the .cm-file that listed a/b/c.sml.  As usual, such
2516    paths are resolved relative to the .cm-files directory, so baz.cm must
2517    be ignored to get the "real" pathname.
2518    
2519    To make this fact more obvious, CM puts the names of such "virtual
2520    arcs" into parentheses when they appear in progress reports. (No
2521    parentheses will appear in the internal protocol encoding.)  Thus,
2522    what you really see is:
2523    
2524      $foo/bar/(baz.cm):a/b/c.sml
2525    
2526    I find this notation to be much more informative than before.
2527    
2528    Another new feature of the encoding is that special characters
2529    including parentheses, colons, (back)slashes, and white space are
2530    written as \ddd (where ddd is the decimal encoding of the character).
2531    
2532    *** The CM manual still needs to be updated.
2533    
2534    ----------------------------------------------------------------------
2535    Name: Allen Leung
2536    Date: 2000/06/15 00:38:00
2537    Tag: leunga-20000615-x86-peephole
2538    
2539    x86 Peephole fix by Fermin.  Affects c-- and moby only.
2540    
2541    ----------------------------------------------------------------------
2542    Name: Matthias Blume
2543    Date: 2000/06/12 11:40:00
2544    Tag: blume-20000612-parmakefix
2545    Description:
2546    
2547    More cleanup after changing the file naming scheme: This time I
2548    repaired the parallel make mechanism for CMB.make which I broke earlier.
2549    
2550    ----------------------------------------------------------------------
2551    Name: Allen Leung
2552    Date: 2000/06/09 01:25:00
2553    Tag: leunga-20000609-various
2554    
2555    None of these things should affect normal SML/NJ operations
2556    
2557    1. Peephole improvements provided by Fermin (c--)
2558    2. New annotation DEFUSE for adding extra dependence (moby)
2559    3. New X86 LOCK instructions (moby)
2560    4. New machine description language for reservation tables (scheduling)
2561    5. Fixes to various optimization/analysis modules (branch chaining, dominator
2562       trees etc.)
2563    6. I've changed the CM files so that they can work with versions
2564       110.0.6, 110.25 and 110.28
2565    
2566    ----------------------------------------------------------------------
2567    Name: Matthias Blume
2568    Date: 2000/06/09 12:40:00
2569    Tag: blume-20000609-log
2570    Description:
2571    
2572    - Removed all(?) remaining RCS Log entries from sources.
2573    
2574    - Fixed bug in ml-yacc and ml-lex sources (use explicit anchors for
2575      anchored paths).
2576    
2577    ----------------------------------------------------------------------
2578    Name: Matthias Blume
2579    Date: 2000/06/07 17:00:00 JST
2580    Tag: blume-20000607-no-implicit-anchors
2581    Description:
2582    
2583    1. This update changes the default setting for
2584    CM.Control.implicit_anchors from true to false.  This means that
2585    implicit anchors are no longer permitted by default.  I also tried to
2586    make sure that nothing else still relies on implicit anchors.
2587    (This is the next step on the schedule towards a CM that does not even
2588    have the notion of implicit anchors anymore.)
2589    
2590    2. More CM manual updates.
2591    
2592    3. I managed to track down and fix the pickling bug I mentioned last
2593    time.  Because of the previously existing workaround, this entails no
2594    immediate practical changes.
2595    
2596    ----------------------------------------------------------------------
2597    Name: Matthias Blume
2598    Date: 2000/06/06 11:15:00 JST
2599    Tag: blume-20000606-lazierpickle
2600    Description:
2601    
2602    !!!! NEW BOOT FILES !!!!
2603    
2604    * The main purpose of this update is to make library pickles lazier in
2605    order to reduce the initial space penalty for autoloading a library.
2606    As a result, it is now possible to have $smlnj/compiler.cm
2607    pre-registered.  This should take care of the many complaints or
2608    inquiries about missing structure Compiler.  This required changes to
2609    CM's internal data structures and small tweaks to some algorithms.
2610    
2611    As a neat additional effect, it is no longer necessary (for the sake
2612    of lean heap image files) to distinguish between a "minimal" CM and a
2613    "full" CM.  Now, there is only one CM (i.e., the "full" version:
2614    $smlnj/cm.cm aka $smlnj/cm/full.cm), and it is always available at the
2615    interactive top level. ($smlnj/cm/minimal.cm is gone.)
2616    
2617    To make the life of compiler-hackers easier, "makeml" now also
2618    pre-registers $smlnj/cmb.cm (aka $smlnj/cmb/current.cm).  In other
2619    words, after you bootstrap a new sml for the first time, you will not
2620    have to autoload $smlnj/cmb.cm again afterwards.  (The first time
2621    around you will still have to do it, though.)
2622    
2623    * A second change consists of major updates to the CM manual.  There
2624    are now several appendices with summary information and also a full
2625    specification of the CM description file syntax.
2626    
2627    * In directory src/system I added the script "allcross".  This script
2628    invokes sml and cross-compiles the compiler for all supported
2629    architectures.  (Useful when providing a new set of boot files.)
2630    
2631    * There seems to be a latent bug in my "lazy pickles" mechanism.  I
2632    added a small tweak to pickle-util.sml to work around this problem,
2633    but it is not a proper fix yet.  I will investigate further.  (The
2634    effect of the bug was an inflation of library pickle size.)
2635    
2636    * Version number increased to 110.28.1 (to avoid compatibility problems).
2637    
2638    ----------------------------------------------------------------------
2639    Name: Allen Leung
2640    Date: 2000/05/25 17:28 EDT
2641    Tag: leunga-20000525-ra
2642    Description:
2643    
2644      Fixed a bug in freezing phase of the register allocator.
2645    
2646    ----------------------------------------------------------------------
2647    Name: Allen Leung
2648    Date: 2000/05/15 22:53 EDT
2649    Tag: leunga-20000515-alpha-x86-ra
2650    Description:
2651    
2652      1. Alpha
2653    
2654          Slight cleanup.  Removed the instruction SGNXL
2655    
2656      2. X86
2657    
2658          Added the following instructions to the instruction set:
2659    
2660            ROLx, RORx,
2661            BTx, BTSx, BTLx, BTRx,
2662            XCHGx, and variants with the LOCK prefix
2663    
2664      3. Register Allocation
2665    
2666          The module ra-rewrite-with-renaming has been improved.
2667    
2668      These have no effect on SML/NJ.
2669    
2670    ----------------------------------------------------------------------
2671    Name: Matthias Blume
2672    Date: 2000/05/15 16:20:00 JST
2673    Tag: blume-20000515-lightrebuild
2674    Description:
2675    
2676    1. I added an alternative to "-rebuild" to "makeml".  The difference is
2677       that prior to calling CMB.make' the CM-variable "LIGHT" will be
2678       defined.  In effect, the command will not build any cross-compiler
2679       backends and therefore finish more quickly.
2680    
2681       The "fixpt" script also takes a "-light" switch to be able to use
2682       this new facility while compiling for a fixpoint.
2683    
2684    2. I replaced all mentions of anchored paths in group owner specifications
2685       with simple relative paths (usually starting with "..").
2686       The rationale is that a library's internal workings should not be
2687       compromised by the lack of some anchor.  (An anchor is necessary
2688       for someone who wants to refer to the library by an anchored path,
2689       but it should not be necessary to build the same library in the first
2690       place.)
2691    
2692    3. I changed the way CM's tool mechanism determines the shell command
2693       string used for things like ml-yacc etc. so that it does not break
2694       when CM.Control.implicit_anchors is turned off.
2695    
2696    ----------------------------------------------------------------------
2697    Name: Matthias Blume
2698    Date: 2000/05/12 18:20:00 JST
2699    Tag: blume-20000512-ml-build
2700    Description:
2701    
2702    Fixed a bug in config/_ml-build that prevented ml-yacc and ml-lex from
2703    getting installed properly (by config/install.sh).
2704    
2705    ----------------------------------------------------------------------
2706    Name: Matthias Blume
2707    Date: 2000/05/12 17:30:00 JST
2708    Tag: blume-20000512-anchors
2709    Description:
2710    
2711    !!! NEW BOOT FILES !!!
2712    
2713    This change is in preparation of fading out support for "implicitly
2714    anchored path names".  I went through all sources and used the
2715    explicit (and relatively new) $-notation.  See system/README and the
2716    CM manual for more info on this.
2717    
2718    I also modified the anchoring scheme for some things such as "smlnj",
2719    "MLRISC", "cm", etc. to take advantage of the fact that explicit
2720    anchors are more expressive: anchor name and first arc do not have to
2721    coincide.  This entails the following user-visible change:
2722    
2723    You have to write $smlnj/foo/bar instead of smlnj/foo/bar.  In
2724    particular, when you fire up sml with a command-line argument, say,
2725    e.g.:
2726    
2727       sml '$smlnj/cmb.cm'
2728    
2729    At the ML toplevel prompt:
2730    
2731       CM.autoload "$smlnj/cmb.cm";
2732    
2733    There is also a new controller in CM.Control that can be used to turn
2734    off all remaining support for implicit anchors by saying:
2735    
2736        CM.autoload "$smlnj/
2737        #set CM.Control.implicit_anchors false;
2738    
2739    This causes CM to reject implicitly anchored paths.  This is (for the
2740    time being) less permissive than the "final" version where there will
2741    be no more such implicit anchors and relative paths will be just that:
2742    relative.
2743    
2744    The next step (version after next version?) will be to make the
2745    default for CM.Control.implicit_anchors false.  After the dust has
2746    settled, I can then produce the "final" version of this...
2747    
2748    Note: Since bootstrapping is a bit tricky, I provided new boot files.
2749    
2750    ----------------------------------------------------------------------
2751    Name: Matthias Blume
2752    Date: 2000/05/11 16:30:00 JST
2753    Tag: blume-20000511-sources
2754    Description:
2755    
2756    The main change is that I added function CM.sources as a generalized
2757    version of the earlier CM.makedepend.  This entails the following
2758    additional changes:
2759    
2760      - CM.makedepend has been dropped.
2761    
2762      - CM manual has been updated.
2763    
2764      - TOOLS signature and API have been changed.
2765    
2766    ----------------------------------------------------------------------
2767    Name: Allen Leung
2768    Date: 2000/05/10 21:17 EDT
2769    Tag: leunga-20000510-moby-c--ssa
2770    Description:
2771    
2772      Various bug fixes and new features for C--, Moby and MLRISC optimizations.
2773    None of these affect SML/NJ.
2774    
2775    1. Register Allocation
2776    
2777        a. A new ra spilling module (ra/ra-spill-with-renaming) is implemented.
2778           This module tries to remove local (i.e. basic block level) redundancies
2779           during spilling.
2780    
2781        b. A new framework for performing region based register allocation.
2782           Not yet entirely functional.
2783    
2784    2. X86
2785    
2786       a. DefUse for POP was missing the stack pointer [found by Lal]
2787       b. Reload for CALL was incorrect in X86Spill [found by John]
2788       c. Various fixes in X86Spill so that it can be used correctly for
2789          the new spilling module.
2790    
2791    3. SSA/IR
2792    
2793       a. New module ir/dj-dataflow.sml implements elimination based
2794          data flow analysis.
2795    
2796    4. MLRiscGen
2797    
2798       a. Fix for gc type annotation
2799    
2800    5. MDGen
2801    
2802       Various fixes for machine description -> ml code translation.  For ssa
2803       only.
2804    
2805    ----------------------------------------------------------------------
2806    Name: Allen Leung
2807    Date: 2000/05/08 22:17 EDT
2808    Tag: leunga-20000508-labexp
2809    Description:
2810    
2811      Fermin has found a few assembly problems with constant expressions
2812      generated in LabelExp.  Mostly, the problems involve extra parentheses,
2813      which choke on dumb assemblers.  This is his fix.
2814    
2815    ----------------------------------------------------------------------
2816    Name: Dave MacQueen
2817    Date: 2000/04/09 14:00 EDT
2818    Tag: dbm-20000502-Version_110_28
2819    Description:
2820    
2821    1. Updated src/compiler/TopLevel/main/version.sml to version 110.28
2822    
2823    2. Updated config/version to 110.28
2824    
2825    3. Updated config/srcarchiveurl
2826    
2827    3. New boot files!
2828       ftp://ftp.research.bell-labs.com/dist/smlnj/working/110.28/
2829    
2830    ----------------------------------------------------------------------
2831    Name: Matthias Blume
2832    Date: 2000/05/01 19:05:00 JST
2833    Tag: blume-20000501-noweb
2834    Description:
2835    
2836    A new noweb tool has been added.  The existing system is entirely
2837    unaffected by this, but some CM users have asked for renewed noweb
2838    support.  Everything is documented in the CM manual.
2839    
2840    New (plugin) libraries:
2841    
2842       noweb-tool.cm
2843       nw-ext.cm
2844    
2845    ----------------------------------------------------------------------
2846    Name: Dave MacQueen
2847    Date: 2000/04/30 12:40PM EDT
2848    Tag: dbm-20000430-bug_fixes
2849    Description:
2850    
2851    1. Fix for bug 1498
2852       smlnj/src/system/Basis/Implementation/Unsafe/object.sig
2853       smlnj/src/system/Basis/Implementation/Unsafe/object.sml
2854         added toRealArray function
2855       smlnj/src/compiler/MiscUtil/print/ppobj.sml
2856         added check for tag Obj.RealArray to array printing case in ppObj
2857    
2858    2. Fix for bug 1510
2859       smlnj/src/compiler/Semant/types/typesutil.sml
2860         fixed definition of dummyargs (used by equalTycon) so that
2861         dummy args are distinct types
2862    
2863    ----------------------------------------------------------------------
2864    Name: Matthias Blume
2865    Date: 2000/04/30 01:00:00 JST
2866    Tag: blume-20000430-versions
2867    Description:
2868    
2869    1. CM version numbering added.  This is an implementation of Lal's
2870       proposal for adding version numbers and version checking to .cm
2871       files.  Lal said that his proposal was just that -- a proposal.
2872       For the time being I went ahead and implemented it so that people
2873       can comment on it.  Everything is completely backward-compatible
2874       (except for the stable library format, i.e., new bootfiles!).
2875    
2876       As usual, see the CM manual for details.
2877    
2878    2. An alternative syntax for anchored paths has been implemented.
2879       Dave has recently voiced the same concerns that I had when I did
2880       this, so there should be some support.  My take is that eventually
2881       I will let support for the current syntax (where anchors are
2882       "implicit") fade out in favor of the new, explicit syntax.
2883       In order to be backward-compatible, both old and new syntax are
2884       currently supported.
2885    
2886       Again, see the CM manual for details.
2887    
2888    3. Parallel make is trying to be slightly smarter:  When the master
2889       process finds a "bottleneck", i.e., when there is only one
2890       compilation unit that can be compiled and everybody else is
2891       waiting on it, then it will simply compile it directly instead
2892       of clumsily telling one of the slaves to do it.
2893    
2894    4. Support for "unsharing" added.  This is necessary in order to be
2895       able to have two different versions of the same library running
2896       at the same time (e.g., for trying out a new MLRISC while still
2897       having the old MLRISC linked into the current compiler, etc.)
2898       See the CM manual.
2899    
2900    5. Simple "makedepend" functionality added for generating Makefile
2901       dependency information.  (This is rather crude at the moment.
2902       Expect some changes here in the future.)
2903    
2904    6. ".fun" added as a recognized suffix for ML files. Also documented
2905       explicitly in the manual that the fallback behavior (unknown suffix
2906       -> ML file) is not an official feature!
2907    
2908    7. Small changes to the pickler for stable libraries.
2909    
2910    8. Several internal changes to CM (for cleanup/improvement).
2911    
2912    
2913    !!!! NEW BINFILES !!!!
2914    
2915    ----------------------------------------------------------------------
2916    Name: Matthias Blume
2917    Date: 2000/04/28 17:30:00 JST
2918    Tag: blume-20000428-pathconfig
2919    Description:
2920    
2921    1. I changed config/install.sh to remove duplicate entries from the
2922       lib/pathconfig file at the end.  Moreover, the final version of
2923       lib/pathconfig is sorted alphabetically.  The same (sorting) is done
2924       in src/system/installml.
2925    
2926    2. The config/install.sh script now consistently uses relative
2927       pathnames in lib/pathconfig whenever the anchor is in the lib
2928       directory.  (So far this was true for the libraries that come
2929       pre-compiled and bundled as part of the bootfiles but not for
2930       libraries that are compiled by the script itself.)
2931    
2932    ----------------------------------------------------------------------
2933    Name: Matthias Blume
2934    Date: 2000/04/26 13:10:00 JST
2935    Tag: blume-20000426-fun_suffix
2936    Description:
2937    
2938    Added ".fun" as a recognized file name suffix (for ML code).
2939    
2940    ----------------------------------------------------------------------
2941    Name: Allen Leung
2942    Date: 2000/04/25 17:00:00 EST
2943    Tag: leunga-20000425-alpha-ra
2944    Description:
2945    
2946    1. Alpha
2947    
2948        PSEUDOARITH was missing in AlphaRewrite.  This causes an endless loop
2949    in C--.
2950    
2951    2. RA
2952    
2953       Added a flag "ra-dump-size" to print out the size of the flowgraph
2954       and the interference graph.
2955    
2956    ----------------------------------------------------------------------
2957    Name: Dave MacQueen
2958    Date: 2000/04/25/
2959    Tag: dbm-20000425-mlyacc_doc_examples
2960    Description:
2961      Updated mlyacc.tex sections 5 and 7 for SML '97 and CM.
2962      Updated all three examples in src/ml-yacc/examples to run
2963      under 110.* using CM.make.
2964    
2965    ----------------------------------------------------------------------
2966    Name: Allen Leung
2967    Date: 2000/04/20 23:04:00 EST
2968    Tag: leunga-20000420-ssa-c---stuff
2969    Description:
2970    
2971      This update synchronizes my repository with Yale's.  Most of these
2972    changes, however, do not affect SML/NJ at all (the RA is an exception).
2973    
2974    1. Register Allocator
2975    
2976       a. An improvement in the interference graph construction:
2977          Given a copy
2978    
2979                s <- t
2980    
2981          no interference edge between s and t is added for this definition of s.
2982    
2983       b. I've added two new spill heuristic modules that Fermin and I developed
2984          (in the new library RA.cm). These are unused in SML/NJ but maybe
2985          useful for others (Moby?)
2986    
2987    2. X86
2988    
2989       a. Various fixes in the backend provided by Fermin [C--] and Lal.
2990    
2991    3. Alpha
2992    
2993       a. Added the BSR instruction and code generation that goes with it [C--]
2994       b. Other fixes too numerous to recount provided by Fermin [C--]
2995    
2996    4. Regmaps
2997    
2998       a. The regmaps are not initialized with the identity physical bindings
2999          at creation time.  This is unneeded.
3000    
3001    5. MLRISC Optimizations
3002    
3003       a. The DJ-Graph module can now compute the iterated dominance frontiers
3004          intersects with liveness incrementally in linear time! Woohoo!
3005          This is now used in my new SSA construction algorithm.
3006    
3007       b. THe branch reorganization module is now smarter about linear chains of
3008          basic blocks.
3009    
3010    
3011    ----------------------------------------------------------------------
3012  Name: Matthias Blume  Name: Matthias Blume
3013  Date: 2000/04/12 13:52:00 JST  Date: 2000/04/12 13:52:00 JST
3014  Tag: blume_main_v110p27_1  Tag: blume_main_v110p27_1
# Line 129  Line 3126 
3126    
3127  3.  Assembly  3.  Assembly
3128    
3129      When generating assemby, resolve the value of client defined constants,      When generating assembly, resolve the value of client defined constants,
3130      instead of generating symbolic values.  This is controlled by the      instead of generating symbolic values.  This is controlled by the
3131      new flag "asm-resolve-constants", which is default to true.      new flag "asm-resolve-constants", which is default to true.
3132    
# Line 152  Line 3149 
3149    
3150  To this end, I arranged that instead of "structure Core" as "structure  To this end, I arranged that instead of "structure Core" as "structure
3151  _Core" is bound in the pervasive environment.  Core access is done via  _Core" is bound in the pervasive environment.  Core access is done via
3152  _Core (which can never be accidentially rebound because _Core is not a  _Core (which can never be accidentally rebound because _Core is not a
3153  legal surface-syntax symbol).  legal surface-syntax symbol).
3154    
3155  The current solution is much cleaner because the core environment is  The current solution is much cleaner because the core environment is
# Line 162  Line 3159 
3159  with dynamic and symbolic parts of the core environment.  with dynamic and symbolic parts of the core environment.
3160    
3161  Remaining hackery (to bind the "magic" symbol _Core) is localized in the  Remaining hackery (to bind the "magic" symbol _Core) is localized in the
3162  compilation mananger's bootstrap compiler (actually: in the "init group"  compilation manager's bootstrap compiler (actually: in the "init group"
3163  handling).  See the comments in src/system/smlnj/init/init.cmi for  handling).  See the comments in src/system/smlnj/init/init.cmi for
3164  more details.  more details.
3165    
# Line 277  Line 3274 
3274     (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
3275     used).     used).
3276    
3277     This was done to accomodate the new "make" and "shell" tools which     This was done to accommodate the new "make" and "shell" tools which
3278     facilitate fairly seemless hookup to portions of code managed using     facilitate fairly seamless hookup to portions of code managed using
3279     Makefiles or Shell scripts.     Makefiles or Shell scripts.
3280    
3281     There are no classes "shared" or "private" anymore.  Instead, the     There are no classes "shared" or "private" anymore.  Instead, the
# Line 290  Line 3287 
3287    
3288     All existing tools are described in the CM manual.     All existing tools are described in the CM manual.
3289    
3290     - Slightly better error handling.  (CM now surpresses many followup     - Slightly better error handling.  (CM now suppresses many followup
3291     error messages that tended to be more annoying than helpful.)     error messages that tended to be more annoying than helpful.)
3292    
3293  2. Major changes to the compiler's static environment data structures.  2. Major changes to the compiler's static environment data structures.
# Line 321  Line 3318 
3318       elaborator). There were a lot of changes during my "linkpath" trials       elaborator). There were a lot of changes during my "linkpath" trials
3319       that could have been reverted to their original state but weren't.       that could have been reverted to their original state but weren't.
3320       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
3321       than what was strictly necessary...  (I _did_ resist the tempation       than what was strictly necessary...  (I _did_ resist the temptation
3322       of doing any "global reformatting" to avoid an untimely death at       of doing any "global reformatting" to avoid an untimely death at
3323       Dave's hands. :)       Dave's hands. :)
3324    
# Line 424  Line 3421 
3421    
3422       I've changed andl to testl in the floating point test sequence       I've changed andl to testl in the floating point test sequence
3423       whenever appropriate.  The Intel optimization guide states that       whenever appropriate.  The Intel optimization guide states that
3424       testl is perferable to andl.       testl is preferable to andl.
3425    
3426  7. RA (x86 only)  7. RA (x86 only)
3427    
# Line 606  Line 3603 
3603    
3604  1. Tools.registerStdShellCmdTool (from smlnj/cm/tool.cm) takes an  1. Tools.registerStdShellCmdTool (from smlnj/cm/tool.cm) takes an
3605  additional argument called "template" which is an optional string that  additional argument called "template" which is an optional string that
3606  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
3607  explanation.  explanation.
3608    
3609  2. A special-purpose tool can be "regisitered" by simply dropping the  2. A special-purpose tool can be "registered" by simply dropping the
3610  corresponding <...>-tool.cm (and/or <...>-ext.cm) into the same  corresponding <...>-tool.cm (and/or <...>-ext.cm) into the same
3611  directory where the .cm file lives that uses this tool.  (The  directory where the .cm file lives that uses this tool.  (The
3612  behavior/misfeature until now was to look for the tool description  behavior/misfeature until now was to look for the tool description
# Line 653  Line 3650 
3650  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
3651  <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,
3652  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
3653  perhaps got accidentially killed).  In this case, fixpt will quickly  perhaps got accidentally killed).  In this case, fixpt will quickly
3654  move through what exists before continuing where it left off earlier,  move through what exists before continuing where it left off earlier,
3655  and, thus, saves a lot of time.  and, thus, saves a lot of time.
3656    
# Line 703  Line 3700 
3700    it from that remote directory.    it from that remote directory.
3701    This should simplify installation further:  For machines that have    This should simplify installation further:  For machines that have
3702    access to the internet, just fetch <version>-config.tgz, unpack it,    access to the internet, just fetch <version>-config.tgz, unpack it,
3703    edit config/targets, and go (run config/install.sh).  The scipt will    edit config/targets, and go (run config/install.sh).  The script will
3704    fetch everything else that it might need all by itself.    fetch everything else that it might need all by itself.
3705    
3706    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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