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Diff of /sml/trunk/HISTORY

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revision 660, Thu Jun 15 04:40:56 2000 UTC revision 1011, Thu Jan 10 20:22:04 2002 UTC
# Line 8  Line 8 
8  The form of an entry should be:  The form of an entry should be:
9    
10  Name:  Name:
11  Date:  Date: yyyy/mm/dd
12  Tag: <post-commit CVS tag>  Tag: <post-commit CVS tag>
13  Description:  Description:
14  ----------------------------------------------------------------------  ----------------------------------------------------------------------
15    Name: Matthias Blume
16    Date: 2002/01/10
17    Tag: blume-20020110-newffigen
18    Description:
19    
20    1. Updates to portable graph code.
21    
22    2. Major update to ml-nlffigen and ml-nlffi-lib.  Things are much
23       more scalable now so that even huge interfaces such as the one
24       for GTK compile in finite time and space. :-)
25       See src/ml-nlffigen/README for details on what's new.
26    
27    ----------------------------------------------------------------------
28    Name: Lal George
29    Date: 2001/01/09 14:31:35 EST 2002
30    Tag: george-20011206-rm-native-copy
31    Description:
32    
33            Removed the native COPY and FCOPY instructions
34            from all the architectures and replaced it with the
35            explicit COPY instruction from the previous commit.
36    
37            It is now possible to simplify many of the optimizations
38            modules that manipulate copies. This has not been
39            done in this change.
40    
41    ----------------------------------------------------------------------
42    Name: Lal George
43    Date: 2001/12/06 16:50:13 EST 2001
44    Tag: george-20011206-mlrisc-instruction
45    Description:
46    
47    Changed the representation of instructions from being fully abstract
48    to being partially concrete. That is to say:
49    
50      from
51            type instruction
52    
53      to
54            type instr                              (* machine instruction *)
55    
56            datatype instruction =
57                LIVE of {regs: C.cellset, spilled: C.cellset}
58              | KILL of {regs: C.cellset, spilled: C.cellset}
59              | COPYXXX of {k: CB.cellkind, dst: CB.cell list, src: CB.cell list}
60              | ANNOTATION of {i: instruction, a: Annotations.annotation}
61              | INSTR of instr
62    
63    This makes the handling of certain special instructions that appear on
64    all architectures easier and uniform.
65    
66    LIVE and KILL say that a list of registers are live or killed at the
67    program point where they appear. No spill code is generated when an
68    element of the 'regs' field is spilled, but the register is moved to
69    the 'spilled' (which is present, more for debugging than anything else).
70    
71    LIVE replaces the (now deprecated) DEFFREG instruction on the alpha.
72    We used to generate:
73    
74            DEFFREG f1
75            f1 := f2 + f3
76            trapb
77    
78    but now generate:
79    
80            f1 := f2 + f3
81            trapb
82            LIVE {regs=[f1,f2,f3], spilled=[]}
83    
84    Furthermore, the DEFFREG (hack) required that all floating point instruction
85    use all registers mentioned in the instruction. Therefore f1 := f2 + f3,
86    defines f1 and uses [f1,f2,f3]! This hack is no longer required resulting
87    in a cleaner alpha implementation. (Hopefully, intel will not get rid of
88    this architecture).
89    
90    COPYXXX is intended to replace the parallel COPY and FCOPY  available on
91    all the architectures. This will result in further simplification of the
92    register allocator that must be aware of them for coalescing purposes, and
93    will also simplify certain aspects of the machine description that provides
94    callbacks related to parallel copies.
95    
96    ANNOTATION should be obvious, and now INSTR represents the honest to God
97    machine instruction set!
98    
99    The <arch>/instructions/<arch>Instr.sml files define certain utility
100    functions for making porting easier -- essentially converting upper case
101    to lower case. All machine instructions (of type instr) are in upper case,
102    and the lower case form generates an MLRISC instruction. For example on
103    the alpha we have:
104    
105      datatype instr =
106         LDA of {r:cell, b:cell, d:operand}
107       | ...
108    
109      val lda : {r:cell, b:cell, d:operand} -> instruction
110        ...
111    
112    where lda is just (INSTR o LDA), etc.
113    
114    ----------------------------------------------------------------------
115    Name: Matthias Blume
116    Date: 2001/11/22 21:40:00 EST
117    Tag: Release_110_37
118    Description:
119    
120    Release 110.37.  This time for real.
121    
122    ----------------------------------------------------------------------
123    Name: Matthias Blume
124    Date: 2001/11/21 16:35:00 EST
125    Tag: blume-20011121-foot-in-mouth
126    Description:
127    
128    Removed the "Release_110_37" tag because of a serious bug.
129    This will be re-tagged once the bug is fixed.
130    
131    ----------------------------------------------------------------------
132    Name: Matthias Blume
133    Date: 2001/11/21 16:14:00 EST
134    Tag: blume-20011121-forgottenfile
135    Description:
136    
137    Forgot to add a file.  (Just a .tex-file -- part of
138    the CM manual source.)
139    
140    ----------------------------------------------------------------------
141    Name: Matthias Blume
142    Date: 2001/11/21 16:10:00 EST
143    Tag: blume-20011121-invalid_110_37
144    Description:
145    
146    Note: I removed the original tag "Release_110_37" from this commit
147          because we found a serious bug in all non-x86 backends.
148          - Matthias
149    
150    1. Modifications to the SML/NJ code generator and to the runtime system
151       so that code object name strings are directly inserted into code
152       objects at code generation time.  The only business the runtime system
153       has with this is now to read the name strings on occasions.
154       (The encoding of the name string has also changed somewhat.)
155    
156    2. CM now implements a simple "set calculus" for specifying export lists.
157       In particular, it is now possible to refer to the export lists of
158       other libraries/groups/sources and form unions as well as differences.
159       See the latest CM manual for details.
160    
161    3. An separate notion of "proxy" libraries has again be eliminated from
162       CM's model.  (Proxy libraries are now simply a special case of using
163       the export list calculus.)
164    
165    4. Some of the existing libraries now take advantage of the new set
166       calculus.
167       (Notice that not all libraries have been converted because some
168       of the existing .cm-files are supposed to be backward compatible
169       with 110.0.x.)
170    
171    5. Some cleanup in stand-alone programs.  (Don't use "exnMessage" -- use
172       "General.exnMessage"!  The former relies on a certain hook to be
173       initialized, and that often does not happen in the stand-alone case.)
174    
175    ----------------------------------------------------------------------
176    Name: Lal George
177    Date: 2001/11/21  13:56:18 EST
178    Tag: george-2001121-pseudo-ops
179    Description:
180    
181      Implemented a complete redesign of MLRISC pseudo-ops. Now there
182      ought to never be any question of incompatabilities with
183      pseudo-op syntax expected by host assemblers.
184    
185      For now, only modules supporting GAS syntax are implemented
186      but more should follow, such as MASM, and vendor assembler
187      syntax, e.g. IBM as, Sun as, etc.
188    
189    ----------------------------------------------------------------------
190    Name: Matthias Blume
191    Date: 2001/11/14 11:52:00 EST
192    Tag: blume-20011114-srcname
193    Description:
194    
195    1. Routed the name of the current source file to mlriscgen where it
196       should be directly emitted into the code object.  (This last part
197       is yet to be done.)
198    
199    2. Some cleanup of the pgraph code to make it match the proposal that
200       I put out the other day.  (The proposal notwithstanding, things are
201       still in flux here.)
202    
203    ----------------------------------------------------------------------
204    Name: Lal George
205    Date: 2001/11/14 09:44:04 EST
206    Tag:
207    Description:
208    
209      Fix for a backpatching bug reported by Allen.
210    
211      Because the boundary between short and long span-dependent
212      instructions is +/- 128, there are an astounding number of
213      span-dependent instructions whose size is over estimated.
214    
215      Allen came up with the idea of letting the size of span
216      dependent instructions be non-monotonic, for a maxIter
217      number of times, after which the size must be monotonically
218      increasing.
219    
220      This table shows the number of span-dependent instructions
221      whose size was over-estimated as a function of maxIter, for the
222      file Parse/parse/ml.grm.sml:
223    
224         maxIter            # of instructions:
225            10                      687
226            20                      438
227            30                      198
228            40                        0
229    
230      In compiling the compiler, there is no significant difference in
231      compilation speed between maxIter=10 and maxIter=40. Actually,
232      my measurements showed that maxIter=40 was a tad faster than
233      maxIter=10! Also 96% of the  files in the compiler reach a fix
234      point within 13 iterations, so fixing maxIter at 40, while high,
235      is okay.
236    
237    ----------------------------------------------------------------------
238    Name: Matthias Blume
239    Date: 2001/10/31 15:25:00 EST
240    Tag: blume-20011031-pgraph
241    Description:
242    
243    CKIT:
244    * Changed the "Function" constructor of type Ast.ctype to carry optional
245      argument identifiers.
246    * Changed the return type of TypeUtil.getFunction accordingly.
247    * Type equality ignores the argument names.
248    * TypeUtil.composite tries to preserve argument names but gives up quickly
249      if there is a mismatch.
250    
251    installation script:
252    * attempts to use "curl" if available (unless "wget" is available as well)
253    
254    CM:
255    * has an experimental implementation of "portable graphs" which I will
256      soon propose as an implementation-independent library format
257    * there are also new libraries $/pgraph.cm and $/pgraph-util.cm
258    
259    NLFFI-LIB:
260    * some cleanup (all cosmetic)
261    
262    NLFFIGEN:
263    * temporarily disabled the mechanism that suppresses ML output for
264      C definitions whose identifiers start with an underscore character
265    * generate val bindings for enum constants
266    * user can request that only one style (light or heavy) is being used;
267      default is to use both (command-line arguments: -heavy and -light)
268    * fixed bug in handling of function types involving incomplete pointers
269    * generate ML entry points that take record arguments (i.e., using
270      named arguments) for C functions that have a prototype with named
271      arguments
272      (see changes to CKIT)
273    
274    ----------------------------------------------------------------------
275    Name: Allen Leung
276    Date: 2001/10/27 20:34:00 EDT
277    Tag: leunga-20011027-x86-fast-fp-call
278    Description:
279    
280       Fixed the bug described in blume-20010920-slowfp.
281    
282       The fix involves
283          1. generating FCOPYs in FSTP in ia32-svid
284          2. marking a CALL with the appropriate annotation
285    
286    ----------------------------------------------------------------------
287    Name: Matthias Blume
288    Date: 2001/10/16 11:32:00 EDT
289    Tag: blume-20011016-netbsd
290    Description:
291    
292    Underscore patch from Chris Richards (fixing problem with compiling
293    runtime system under recent NetBSD).
294    
295    ----------------------------------------------------------------------
296    Name: Allen Leung
297    Date: 2001/10/12 17:18:32 EDT 2001
298    Tag: leung-20011012-x86-printflowgraph
299    Description:
300    
301    X86RA now uses a valid (instead of dummy) PrintFlowgraph module.
302    
303    ----------------------------------------------------------------------
304    Name: Lal George
305    Date: 2001/10/11 23:51:34 EDT
306    Tag: george-20011011-too-many-instrs
307    Description:
308    
309    The representation of a program point never expected to see more
310    than 65536 instructions in a basic block!
311    
312    ----------------------------------------------------------------------
313    Name: Lal George
314    Date: 2001/10/09 09:41:37 EDT
315    Tag: george-20011008-mlrisc-labels
316    Description:
317    
318    Changed the machine description files to support printing of
319    local and global labels in assembly code, based on host assembler
320    conventions.
321    
322    ----------------------------------------------------------------------
323    Name: Matthias Blume
324    Date: 2001/09/25 15:25:00 EDT
325    Tag: blume-20010925-exninfo
326    Description:
327    
328    I provided a non-hook implementation of exnName (at the toplevel) and
329    made the "dummy" implementation of exnMessage (at the toplevel) more
330    useful: if nothing gets "hooked in", then at least you are going to
331    see the exception name and a message indicating why you don't see more.
332    
333    [For the time being, programs that need exnMessage and want to use
334    ml-build should either use General.exnMessage (strongly recommended) or
335    refer to structure General at some other point so that CM sees a
336    static dependency.]
337    
338    [Similar remarks go for "print" and "use":  If you want to use their
339    functionality in stand-alone programs generated by ml-build, then use
340    TextIO.output and Backend.Interact.useFile (from $smlnj/compiler.cm).]
341    
342    ----------------------------------------------------------------------
343    Name: Matthias Blume
344    Date: 2001/09/20 17:28:00 EDT
345    Tag: blume-20010920-slowfp
346    Description:
347    
348    Allen says that x86-fast-fp is not safe yet, so I turned it off again...
349    
350    ----------------------------------------------------------------------
351    Name: Matthias Blume
352    Date: 2001/09/20 17:20:00 EDT
353    Tag: blume-20010920-canonicalpaths
354    Description:
355    
356    0. Updated the BOOT file (something that I forgot to do earlier).
357    
358    1. Small internal change to CM so that it avoids "/../" in filenames
359       as much as possible (but only where it is safe).
360    
361    2. Changed config/_run-sml (resulting in a changed bin/.run-sml) so
362       that arguments that contain delimiters are passed through correctly.
363       This change also means that all "special" arguments of the form
364       @SMLxxx... must come first.
365    
366    3. Changed install script to put relative anchor names for tool commands
367       into pathconfig.
368    
369    ----------------------------------------------------------------------
370    Name: Matthias Blume
371    >>>>>>> 1.169
372    Date: 2001/09/18 15:35:00 EDT
373    Tag: blume-20010918-readme11036
374    Description:
375    
376    Added README files.
377    
378    ----------------------------------------------------------------------
379    Name: Matthias Blume
380    Date: 2001/09/18 11:45:00 EDT
381    Tag: Release_110_36 (retag)
382    Description:
383    
384    Fixed mistake in config/preloads. Retagged as 110.36.
385    
386    ----------------------------------------------------------------------
387    Name: Matthias Blume
388    Date: 2001/09/18 09:40:00 EDT
389    Tag: Release_110_36_orig (tag changed)
390    Description:
391    
392    New version (110.36).  New bootfiles.
393    
394    ----------------------------------------------------------------------
395    Name: Matthias Blume
396    Date: 2001/09/14 16:15:00 EDT
397    Tag: blume-20010914-x86fastfp
398    Description:
399    
400    John committed some changes that Allen made, in particular a (hopefully)
401    correctly working version of the x86-fp module.
402    
403    I changed the default setting of the Control.MLRISC.getFlag "x86-fast-fp"
404    flag to "true".  Everything seems to compile to a fixpoint ok, and
405    "mandelbrot" speeds up by about 15%.
406    
407    ----------------------------------------------------------------------
408    Name: Matthias Blume
409    Date: 2001/09/13 11:20:00 EDT
410    Tag: blume-20010913-minimal
411    Description:
412    
413    1. Stefan Monnier's patch to fix a miscompilation problem that
414       was brought to light by John Reppy's work on Moby.
415    
416    2. Implemented a minimal "structure Compiler" that contains just
417       "version" and "architecture".  The minimal version will be
418       available when the full version is not.  This is for backward-
419       compatibility with code that wants to test Compiler.version.
420    
421    ----------------------------------------------------------------------
422    Name: Matthias Blume
423    Date: 2001/08/28 14:03:00 EDT
424    Tag: blume-20010828-ml-lex
425    Description:
426    
427    Fix for bug 1581, received from Neophytos Michael.
428    
429    ----------------------------------------------------------------------
430    Name: Matthias Blume
431    Date: 2001/08/27 11:20:00 EDT
432    Tag: blume-20010827-readme11035
433    Description:
434    
435    Fleshed out the README file for 110.35.
436    
437    ----------------------------------------------------------------------
438    Name: Matthias Blume
439    Date: 2001/08/24 17:10:00 EDT
440    Tag: Release_110_35
441    Description:
442    
443    New version number (110.35).  New bootfiles.
444    
445    ----------------------------------------------------------------------
446    Name: Lal George
447    Date: 2001/08/24 13:47:18 EDT 2001
448    Tag: george-20010824-MLRISC-graphs
449    Description:
450    
451     removed clusters from MLRISC completely and replaced with graphs.
452    
453    ----------------------------------------------------------------------
454    Name: Matthias Blume
455    Date: 2001/08/23 17:50:00 EDT
456    Tag: blume-20010823-toplevel
457    Description:
458    
459    - some reorganization of the code that implements various kinds of
460      environments in the compiler (static, dynamic, symbolic, combined)
461    - re-implemented the EnvRef module so that evalStream works properly
462      (if the stream contains references to "use", "CM.make", etc.)
463    - cleaned up evalloop.sml and interact.sml (but they need more cleaning)
464    
465    ----------------------------------------------------------------------
466    Name: Matthias Blume
467    Date: 2001/08/20 15:50 EDT
468    Tag: blume20010820-slipup
469    Description:
470    
471    I forgot to commit a few files.  Here they are...
472    
473    ----------------------------------------------------------------------
474    Name: Matthias Blume
475    Date: 2001/08/20 15:35:00 EDT
476    Tag: blume-20010820-debugprof
477    Description:
478    
479    !!!! NEW BOOTFILES !!!!
480    
481    This is another round of reorganizing the compiler sources.  This
482    time the main goal was to factor out all the "instrumentation"
483    passes (for profiling and backtracing) into their own library.
484    The difficulty was to do it in such a way that it does not depend
485    on elaborate.cm but only on elabdata.cm.
486    
487    Therefore there have been further changes to both elaborate.cm and
488    elabdata.cm -- more "generic" things have been moved from the former
489    to the latter.  As a result, I was forced to split the assignment
490    of numbers indicating "primtyc"s into two portions: SML-generic and
491    SML/NJ-specific.  Since it would have been awkward to maintain,
492    I bit the bullet and actually _changed_ the mapping between these
493    numbers and primtycs.  The bottom line of this is that you need
494    a new set of bin- and bootfiles.
495    
496    I have built new bootfiles for all architectures, so doing a fresh
497    checkout and config/install.sh should be all you need.
498    
499    The newly created library's name is
500    
501        $smlnj/viscomp/debugprof.cm
502    
503    and its sources live under
504    
505        src/compiler/DebugProf
506    
507    ----------------------------------------------------------------------
508    Name: Matthias Blume
509    Date: 2001/08/15 17:15:00 EDT
510    Tag: blume-20010815-compreorg
511    Description:
512    
513    This is a first cut at reorganizing the CM libraries that make up the
514    core of the compiler.  The idea is to separate out pieces that could
515    be used independently by tools, e.g., the parser, the typechecker, etc.
516    
517    The current status is a step in this direction, but it is not quite
518    satisfactory yet.  Expect more changes in the future.
519    
520    Here is the current (new) organization...
521    
522        What used to be $smlnj/viscomp/core.cm is now divided into
523        six CM libraries:
524    
525             $smlnj/viscomp/basics.cm
526                           /parser.cm
527                           /elabdata.cm
528                           /elaborate.cm
529                           /execute.cm
530                           /core.cm
531    
532        The CM files for these libraries live under src/system/smlnj/viscomp.
533        All these libraries are proxy libraries that contain precisely
534        one CM library component.  Here are the locations of the components
535        (all within the src/compiler tree):
536    
537             Basics/basics.cm
538             Parse/parser.cm
539             ElabData/elabdata.cm
540             Elaborator/elaborate.cm
541             Execution/execute.cm
542             core.cm
543    
544         [This organization is the same that has been used already
545         for a while for the architecture-specific parts of the visible
546         compiler and for the old version of core.cm.]
547    
548         As you will notice, many source files have been moved from their
549         respective original locations to a new home in one of the above
550         subtrees.
551    
552         The division of labor between the new libraries is the following:
553    
554             basics.cm:
555                - Simple, basic definitions that pertain to many (or all) of
556                  the other libraries.
557             parser.cm:
558                - The SML parser, producing output of type Ast.dec.
559                - The type family for Ast is also defined and exported here.
560             elabdata.cm:
561                - The datatypes that describe input and output of the elaborator.
562                  This includes types, absyn, and static environments.
563             elaborator.cm:
564                - The SML/NJ type checker and elaborator.
565                  This maps an Ast.dec (with a given static environment) to
566                  an Absyn.dec (with a new static environment).
567                - This libraries implements certain modules that used to be
568                  structures as functors (to remove dependencies on FLINT).
569             execute.cm:
570                - Everything having to do with executing binary code objects.
571                - Dynamic environments.
572             core.cm:
573                - SML/NJ-specific instantiations of the elaborator and MLRISC.
574                - Top-level modules.
575                - FLINT (this should eventually become its own library)
576    
577    Notes:
578    
579    I am not 100% happy with the way I separated the elaborator (and its
580    data structures) from FLINT.  Two instances of the same problem:
581    
582        1. Data structures contain certain fields that carry FLINT-specific
583           information.  I hacked around this using exn and the property list
584           module from smlnj-lib.  But the fact that there are middle-end
585           specific fields around at all is a bit annoying.
586    
587        2. The elaborator calculates certain FLINT-related information.  I tried
588           to make this as abstract as I could using functorization, but, again,
589           the fact that the elaborator has to perform calculations on behalf
590           of the middle-end at all is not nice.
591    
592        3. Having to used exn and property lists is unfortunate because it
593           weakens type checking.  The other alternative (parameterizing
594           nearly *everything*) is not appealing, though.
595    
596    I removed the "rebinding =" warning hack because due to the new organization
597    it was awkward to maintain it.  As a result, the compiler now issues some of
598    these warnings when compiling init.cmi during bootstrap compilation. On
599    the plus side, you also get a warning when you do, for example:
600       val op = = Int32.+
601    which was not the case up to now.
602    
603    I placed "assign" and "deref" into the _Core structure so that the
604    code that deals with the "lazy" keyword can find them there.  This
605    removes the need for having access to the primitive environment
606    during elaboration.
607    
608    ----------------------------------------------------------------------
609    Name: Matthias Blume
610    Date: 2001/08/13
611    Tag: blume-20010813-closures
612    Description:
613    
614    This fix was sent to us by Zhong Shao.  It is supposed to improve the
615    performance of certain loops by avoiding needless closure allocation.
616    
617    ----------------------------------------------------------------------
618    Name: Lal George
619    Date: 2001/07/31 10:03:23 EDT 2001
620    Tag: george-20010731-x86-fmalloc
621    Description: Fixed bug in x86 calls
622    
623        There was a bug where call instructions would mysteriously
624        vanish. The call instruction had to be one that returned
625        a floating point value.
626    
627    ----------------------------------------------------------------------
628    Name: Lal George
629    Date: 2001/07/19 16:36:29 EDT 2001
630    Tag: george-20010719-simple-cells
631    Description:
632    
633    I have dramatically simplified the interface for CELLS in MLRISC.
634    
635    In summary, the cells interface is broken up into three parts:
636    
637      1. CellsBasis : CELLS_BASIS
638    
639            CellsBasis is a top level structure and common for all
640            architectures.  it contains the definitions of basic datatypes
641            and utility  functions over these types.
642    
643      2. functor Cells() : CELLS
644    
645            Cells generates an interface for CELLS that incorporates the
646            specific resources on the target architecture, such as the
647            presence of special register classes, their number and size,
648            and various useful substructures.
649    
650      3. <ARCH>CELLS
651    
652            e.g. SparcCells: SPARCCELLS
653    
654            <ARCH>CELLS usually contains additional bindings for special
655            registers  on the architecture, such as:
656    
657                    val r0 : cell           (* register zero *)
658                    val y : cell            (* Y register *)
659                    val psr : cell          (* processor status register *)
660                    ...
661    
662            The structure returned by applying the Cells functor is opened
663            in this interface.
664    
665    The main implication of all this is that the datatypes for cells is
666    split between CellsBasis and CELLS -- a fairly simple change for user
667    code.
668    
669    In the old scheme the CELLS interface had a definitional binding of
670    the form:
671    
672            signature CELLS = sig
673    
674               structure CellsBasis = CellsBasis
675    
676               ...
677    
678            end
679    
680    With all the sharing constraints that goes on in MLRISC, this old
681    design  quickly leads to errors such as:
682    
683            "structure definition spec inside of sharing ... "
684    
685    
686    and appears to require an unacceptable amount of sharing and where
687    constraint hackery.
688    
689    I think this error message (the interaction of definitional specs and
690    sharing) requires more explanation on our web page.
691    
692    ----------------------------------------------------------------------
693    Name: Matthias Blume
694    Date: 2001/07/19 15:00:00 EDT
695    Tag: blume-20010719-libreorg
696    Description:
697    
698    This update puts together a fairly extensive but straightforward change
699    to the way the libraries that implement the interactive system are
700    organized:
701    
702       The biggest change is the elimination of structure Compiler.  As a
703       replacement for this structure, there is now a CM library
704       (known as $smlnj/compiler.cm or $smlnj/compiler/current.cm)
705       that exports all the substructures of the original structure Compiler
706       directly.  So instead of saying Compiler.Foo.bar one now simply
707       says Foo.bar.  (The CM libraries actually export a collection of
708       structures that is richer than the collection of substructures of
709       structure Compiler.)
710    
711       To make the transition smooth, there is a separate library called
712       $smlnj/compiler/compiler.cm which puts together and exports the
713       original structure Compiler (or at least something very close to it).
714    
715       There are five members of the original structure Compiler
716       that are not exported directly but which instead became members
717       of a new structure Backend (described by signature BACKEND).  These are:
718       structure Profile (: PROFILE), structure Compile (: COMPILE), structure
719       Interact (: INTERACT), structure Machine (: MACHINE), and val
720       architecture (: string).
721    
722       Structure Compiler.Version has become structure CompilerVersion.
723    
724       Cross-compilers for alpha32, hppa, ppc, sparc, and x86 are provided
725       by $smlnj/compiler/<arch>.cm where <arch> is alpha32, hppa, ppc, sparc,
726       or x86, respectively.
727       Each of these exports the same frontend structures that
728       $smlnj/compiler.cm exports.  But they do not have a structure Backend
729       and instead export some structure <Arch>Backend where <Arch> is Alpha32,
730       Hppa, PPC, Sparc, or X86, respectively.
731    
732       Library $smlnj/compiler/all.cm exports the union of the exports of
733       $smlnj/compiler/<arch>.cm
734    
735       There are no structures <Arch>Compiler anymore, use
736       $smlnj/compiler/<arch>.cm instead.
737    
738       Library host-compiler-0.cm is gone.  Instead, the internal library
739       that instantiates CM is now called cm0.cm.  Selection of the host
740       compiler (backend) is no longer done here but. (Responsibility for it
741       now lies with $smlnj/compiler/current.cm.  This seems to be more
742       logical.)
743    
744       Many individual files have been moved or renamed.  Some files have
745       been split into multiple files, and some "dead" files have been deleted.
746    
747    Aside from these changes to library organization, there are also changes
748    to the way the code itself is organized:
749    
750       Structure Binfile has been re-implemented in such a way that it no
751       longer needs any knowledge of the compiler.  It exclusively deals
752       with the details of binfile layout.  It no longer invokes the
753       compiler (for the purpose of creating new prospective binfile
754       content), and it no longer has any knowledge of how to interpret
755       pickles.
756    
757       Structure Compile (: COMPILE) has been stripped down to the bare
758       essentials of compilation.  It no longer deals with linking/execution.
759       The interface has been cleaned up considerably.
760    
761       Utility routines for dealing with linking and execution have been
762       moved into their own substructures.
763    
764       (The ultimate goal of these changes is to provide a light-weight
765       binfile loader/linker (at least for, e.g., stable libraries) that
766       does not require CM or the compiler to be present.)
767    
768    CM documentation has been updated to reflect the changes to library
769    organization.
770    
771    ----------------------------------------------------------------------
772    Name: Matthias Blume
773    Date: 2001/07/10 17:30:00 EDT
774    Tag: Release_110_34
775    Description:
776    
777    Minor tweak to 110.34 (re-tagged):
778    
779      - README.html file added to CVS repository
780      - runtime compiles properly under FreeBSD 3.X and 4.X
781    
782    ----------------------------------------------------------------------
783    Name: Matthias Blume
784    Date: 2001/07/10 17:30:00 EDT
785    Tag: Release_110_34
786    Description:
787    
788    New version number (110.34). New bootfiles.
789    
790    ----------------------------------------------------------------------
791    Name: Matthias Blume
792    Date: 2001/07/09 16:00:00 EDT
793    Tag: blume-20010709-more-varargs
794    Description:
795    
796    I changed the handling of varargs in ml-nlffigen again:
797    The ellipsis ... will now simply be ignored (with an accompanying warning).
798    
799    The immediate effect is that you can actually call a varargs function
800    from ML -- but you can't actually supply any arguments beyond the ones
801    specified explicitly.  (For example, you can call printf with its format
802    string, but you cannot pass additional arguments.)
803    
804    This behavior is only marginally more useful than the one before, but
805    it has the advantage that a function or, more importantly, a function
806    type never gets dropped on the floor, thus avoiding follow-up problems with
807    other types that refer to the offending one.
808    
809    ----------------------------------------------------------------------
810    Name: Matthias Blume
811    Date: 2001/07/09 11:25:00 EDT
812    Tag: blume-20010709-varargs
813    Description:
814    
815    1. ckit-lib.cm now exports structure Error
816    2. ml-nlffigen reports occurences of "..." (i.e., varargs function types)
817       with a warning accompanied by a source location.  Moreover, it
818       merely skips the offending function or type and proceeds with the
819       rest of its work.u  As a result, one can safely feed C code containing
820       "..." to ml-nlffigen.
821    3. There are some internal improvements to CM, providing slightly
822       more general string substitutions in the tools subsystem.
823    
824    ----------------------------------------------------------------------
825    Name: Matthias Blume
826    Date: 2001/06/27 15:10:00 EDT
827    Tag: blume-20010627-concur
828    Description:
829    
830    Fixed a small bug in CM's handling of parallel compilation.
831    (You could observe the bug by Control-C-interrupting an ordinary
832    CMB.make or CM.stabilize and then attaching some compile servers.
833    The result was that all of a sudden the previously interrupted
834    compilation would continue on its own.  This was because of
835    an over-optimization: CM did not bother to clean out certain queues
836    when no servers were attached "anyway", resulting in the contents
837    of these queues to grab control when new servers did get attached.)
838    
839    There is also another minor update to the CM manual.
840    
841    ----------------------------------------------------------------------
842    Name: Matthias Blume
843    Date: 2001/06/26 16:15:00 EDT
844    Tag: blume-20010626-cmdoc
845    Description:
846    
847    Minor typo fixed in CM manual (syntax diagram for libraries).
848    
849    ----------------------------------------------------------------------
850    Name: Matthias Blume
851    Date: 2001/06/25 22:55:00 EDT
852    Tag: blume-20010625-x86pc
853    Description:
854    
855    Fixed a nasty bug in the X86 assembly code that caused signal
856    handlers to fail (crash) randomly.
857    
858    ----------------------------------------------------------------------
859    Name: Matthias Blume
860    Date: 2001/06/25 12:05:00 EDT
861    Tag: blume-20010625-nlffigen
862    Description:
863    
864    This update fixes a number of minor bugs in ml-nlffigen as reported by
865    Nick Carter <nbc@andrew.cmu.edu>.
866    
867      1. Silly but ok typedefs of the form "typedef void myvoid;" are now accepted.
868      2. Default names for generated files are now derived from the name of
869         the C file *without its directory*.  In particular, this causes generated
870         files to be placed locally even if the C file is in some system directory.
871      3. Default names for generated signatures and structures are also derived
872         from the C file name without its directory.  This avoids silly things
873         like "structure GL/GL".
874         (Other silly names are still possible because ml-nlffigen does not do
875          a thorough check of whether generated names are legal ML identifiers.
876          When in doubt, use command line arguments to force particular names.)
877    
878    ----------------------------------------------------------------------
879    Name: Matthias Blume
880    Date: 2001/06/21 12:25:00 EDT
881    Tag: blume-20010621-eXene
882    Description:
883    
884    eXene now compiles and (sort of) works again.
885    
886    The library name (for version > 110.33) is $/eXene.cm.
887    
888    I also added an new example in src/eXene/examples/nbody.  See the
889    README file there for details.
890    
891    ----------------------------------------------------------------------
892    Name: Matthias Blume
893    Date: 2001/06/20 16:40:00 EDT
894    Tag: blume-20010620-cml
895    Description:
896    
897    CML now compiles and works again.
898    
899    Libraries (for version > 110.33):
900    
901      $cml/cml.cm            Main CML library.
902      $cml/basis.cm          CML's version of $/basis.cm.
903      $cml/cml-internal.cm   Internal helper library.
904      $cml/core-cml.cm       Internal helper library.
905      $cml-lib/trace-cml.cm  Tracing facility.
906      $cml-lib/smlnj-lib.cm  CML's version of $/smlnj-lib.cm
907    
908    The installer (config/install.sh) has been taught how to properly
909    install this stuff.
910    
911    ----------------------------------------------------------------------
912    Name: Matthias Blume
913    Date: 2001/06/19 17:55:00 EDT
914    Tag: blume-20010619-instantiate
915    Description:
916    
917    This un-breaks the fix for bug 1432.
918    (The bug was originally fixed in 110.9 but I broke it again some
919    time after that.)
920    
921    ----------------------------------------------------------------------
922    Name: Matthias Blume
923    Date: 2001/06/19 17:25:00 EDT
924    Tag: blume-20010619-signals
925    Description:
926    
927    This should (hopefully) fix the long-standing signal handling bug.
928    (The runtime system was constructing a continuation record with an
929    incorrect descriptor which would cause the GC to drop data on the floor...)
930    
931    ----------------------------------------------------------------------
932    Name: Matthias Blume
933    Date: 2001/06/15 15:05:00 EDT
934    Tag: blume-20010615-moresparc
935    Description:
936    
937    Here is a short late-hour update related to Sparc c-calls:
938    
939     -- made handling of double-word arguments a bit smarter
940    
941     -- instruction selection phase tries to collapse certain clumsily
942        constructed ML-Trees; typical example:
943    
944            ADD(ty,ADD(_,e,LI d1),LI d2)  ->  ADD(ty,e,LI(d1+d2))
945    
946        This currently has no further impact on SML/NJ since mlriscGen does
947        not seem to generate such patterns in the first place, and c-calls
948        (which did generate them in the beginning) has meanwhile been fixed
949        so as to avoid them as well.
950    
951    ----------------------------------------------------------------------
952    Name: Matthias Blume
953    Date: 2001/06/15 15:05:00 EDT
954    Tag: blume-20010615-sparc
955    Description:
956    
957    The purpose of this update is to provide an implementation of NLFFI
958    on Sparc machines.
959    
960    Here are the changes in detail:
961    
962       * src/MLRISC/sparc/c-calls/sparc-c-calls.sml is a new file containing
963       the Sparc implementation of the c-calls API.
964       * The Sparc backend of SML/NJ has been modified to uniformely use %fp
965       for accessing the ML frame.  Thus, we have a real frame pointer and
966       can freely modify %sp without need for an omit-frame-ptr phase.
967       The vfp logic in src/compiler/CodeGen/* has been changed to accomodate
968       this case.
969       * ml-nlffigen has been taught to produce code for different architectures
970       and calling conventions.
971       * In a way similar to what was done in the x86 case, the Sparc
972       backend uses its own specific extension to mltree.  (For example,
973       it needs to be able to generate UNIMP instructions which are part
974       of the calling convention.)
975       * ml-nlffi-lib was reorganized to make it more modular (in particular,
976       to make it easier to plug in new machine- and os-dependent parts).
977    
978    There are some other fairly unrelated bug fixes and cleanups as well:
979    
980       * I further hacked the .cm files for MLRISC tools (like MDLGen) so
981       that they properly share their libraries with existing SML/NJ libraries.
982       * I fixed a minor cosmetic bug in CM, supressing certain spurious
983       follow-up error messages.
984       * Updates to CM/CMB documentation.
985    
986    TODO items:
987    
988       * MLRISC should use a different register as its asmTemp on the Sparc.
989         (The current %o2 is a really bad choice because it is part of the
990         calling conventions, so things might interfere in unexpected ways.)
991    
992    ----------------------------------------------------------------------
993    Name: Matthias Blume
994    Date: 2001/06/07
995    Tag: blume-20010607-calls
996    Description:
997    
998    A number of internal changes related to C calls and calling conventions:
999    
1000    1. ML-Tree CALL statements now carry a "pops" field.  It indicates the
1001       number of bytes popped implicitly (by the callee).  In most cases
1002       this field is 0 but on x86/win32 it is some non-zero value.  This
1003       is information provided for the benefit of the "omit-frameptr" pass.
1004    2. The CALL instruction on the x86 carries a similar "pops" field.
1005       The instruction selection phase copies its value from the ML-Tree
1006       CALL statement.
1007    3. On all other architectures, the instruction selection phase checks
1008       whether "pops=0" and complains if not.
1009    4. The c-calls implementation for x86 now accepts two calling conventions:
1010       "ccall" and "stdcall".  When "ccall" is selected, the caller cleans
1011       up after the call and pops is set to 0.  For "stdcall", the caller
1012       does nothing, leaving the cleanup to the callee; pops is set to
1013       the number of bytes that were pushed onto the stack.
1014    5. The cproto decoder (compiler/Semant/types/cproto.sml) now can
1015       distinguish between "ccall" and "stdcall".
1016    6. The UNIMP instruction has been added to the supported Sparc instruction
1017       set. (This is needed for implementing the official C calling convention
1018       on this architecture.)
1019    7. I fixed some of the .cm files under src/MLRISC/Tools to make them
1020       work with the latest CM.
1021    
1022    ----------------------------------------------------------------------
1023    Name: Matthias Blume
1024    Date: 2001/06/05 15:10:00 EDT
1025    Tag: blume-20010605-cm-index
1026    Description:
1027    
1028    0. The "lambdasplit" parameter for class "sml" in CM has been documented.
1029    
1030    1. CM can now generate "index files".  These are human-readable files
1031       that list on a per-.cm-file basis each toplevel symbol defined or
1032       imported.  The location of the index file for
1033       <p>/<d>.cm is <p>/CM/INDEX/<d>.cm.
1034       To enable index-file generation, set CM.Control.generate_index to true
1035       or export an environment-symbol: export CM_GENERATE_INDEX=true.
1036    
1037       The CM manual has been updated accordingly.
1038    
1039    2. I made some slight modifications to the c-calls API in MLRISC.
1040    
1041         a) There is now a callback to support saving/restoring of
1042            dedicated but caller-save registers around the actual call
1043            instruction.
1044         b) One can optionally specify a comment-annotation for the
1045            call instruction.
1046    
1047    3. SML/NJ (mlriscGen.sml) uses this new API for the rawccall primop.
1048       (For example, the comment annotation shows the C prototype of
1049        the function being called.)
1050    
1051    ----------------------------------------------------------------------
1052    Name: Matthias Blume
1053    Date: 2001/06/01 13:30:00 EDT
1054    Tag: blume-20010601-nlffi-cleanup
1055    Description:
1056    
1057    This is mostly a cleanup of MLFFI stuff:
1058    
1059       - some signature files have been put into a more exposed place
1060       - the ugly 'f type parameter is gone (simplifies types tremendously!)
1061       - ml-nlffigen changed accordingly
1062       - tutorial updated
1063    
1064    Other changes:
1065    
1066       - author's affiliation in CM manual(s) updated
1067       - some more recognized keywords added to Allen's sml.sty
1068    
1069    ----------------------------------------------------------------------
1070    Name: Matthias Blume
1071    Date: 2001/05/25 15:30:00 EDT
1072    Tag: blume-20010525-iptr
1073    Description:
1074    
1075      - put the official 110.33-README (as it appears on the ftp server) under
1076        CVS
1077      - fixed a small bug related to incomplete pointer types in
1078        ml-nlffigen
1079      - small cosmetic change to the ml-nlffi-lib's "arr" type constructor
1080        (it does not need the 'f type parameter)
1081    
1082    ----------------------------------------------------------------------
1083    Name: Matthias Blume
1084    Date: 2001/05/23 14:30:00 EDT
1085    Tag: Release_110_33
1086    Description:
1087    
1088    New version number (110.33).  New bootfiles.
1089    
1090    ----------------------------------------------------------------------
1091    Name: Matthias Blume
1092    Date: 2001/05/22 18:06:00 EDT
1093    Tag: blume-20010522-targets
1094    Description:
1095    
1096    Made install.sh use file config/targets.customized if it exists, falling
1097    back to config/targets if it doesn't.  This way one can have a customized
1098    version of the targets file without touching the "real thing", thus
1099    eliminating the constant fear of accidentally checking something bogus
1100    back into the CVS repository...  (File config/targets.customized must
1101    not be added to the repository!)
1102    
1103    ----------------------------------------------------------------------
1104    Name: Matthias Blume
1105    Date: 2001/05/22 16:30:00 EDT
1106    Tag: blume-20010522-minitut
1107    Description:
1108    
1109    1. Bug fix in ml-nlffigen; now (hopefully) correctly handling
1110       struct returns.
1111    2. Added src/ml-nlffi-lib/Doc/mini-tutorial.txt.  This is some very
1112       incomplete, preliminary documentation for NLFFI.
1113    
1114    ----------------------------------------------------------------------
1115    Name: Matthias Blume
1116    Date: 2001/05/14 11:30:00 EDT
1117    Tag: blume-20010514-script
1118    Description:
1119    
1120    Some bugs in install script fixed.
1121    
1122    In addition to that I also made a slight change to the NLFFI API:
1123    Functors generated by ml-nlffigen now take the dynamic library as a
1124    straight functor argument, not as a suspended one.  (The original
1125    functor code used to force the suspension right away anyway, so there
1126    was nothing gained by this complication of the interface.)
1127    
1128    ----------------------------------------------------------------------
1129    Name: Matthias Blume
1130    Date: 2001/05/11 14:35:00 EDT
1131    Tag: blume-20010511-ml-nlffi
1132    Description:
1133    
1134    I finally took the plunge and added my new FFI code to the main
1135    repository.  For x86-linux it is now ready for prime-time.
1136    
1137    There are two new subdirectories of "src":
1138    
1139      - ml-nlffi-lib:
1140           The utility library for programs using the FFI interface.
1141           Here is the implementation of $/c.cm and its associated low-level
1142           partners $/c-int.cm and $/memory.cm.
1143      - ml-nlffigen:
1144           A stand-alone program for generating ML glue code from C source
1145           code.
1146    
1147    Building ml-nlffigen requires $/ckit-lib.cm.
1148    
1149    The config/install.sh script has been updates to do the Right Thing
1150    (hopefully).
1151    
1152    Notice that the source tree for the C-Kit will not be put under "src"
1153    but directly under the installation root directory.  (This is the
1154    structure that currently exists on the CVS server when you check out
1155    module "sml".)  Fortunately, config/install.sh knows about this oddity.
1156    
1157    Bugs: No documentation yet.
1158    
1159    ----------------------------------------------------------------------
1160    Name: Matthias Blume
1161    Date: 2001/05/09 16:35:00 EDT
1162    Tag: blume-20010509-cpscontract
1163    Description:
1164    
1165    Fixed a bug in the accounting code in cpsopt/contract.sml.  (The
1166    wrapper/unwrapper elimination did not decrement usage counts and some
1167    dead variables got overlooked by the dead-up logic.)
1168    
1169    ----------------------------------------------------------------------
1170    Name: Lal George
1171    Date: 2001/05/08  17:26:09 EDT
1172    Tag: george-20010508-omit-frameptr
1173    Description:
1174    
1175    Changes to implement the omit-frame-pointer optimization to support
1176    raw C calls. For now, there is only support on the Intel x86, but
1177    other architectures will follow as more experience is gained with this.
1178    
1179    
1180    ----------------------------------------------------------------------
1181    Name: Matthias Blume
1182    Date: 2001/05/07 14:40:00 EDT
1183    Tag: blume-20010507-proxies
1184    Description:
1185    
1186    I made into "proxy libraries" all libraries that qualify for such a
1187    change.  (A qualifying library is a library that has another library or
1188    groups as its sole member and repeats that member's export list
1189    verbatim.  A proxy library avoids this repetition by omitting its export
1190    list, effectively inheriting the list that its (only) member exports.
1191    See the CM manual for more explanation.)
1192    The main effect is that explicit export lists for these libraries
1193    do not have to be kepts in sync, making maintenance a bit easier.
1194    
1195    I also added copyright notices to many .cm-files.
1196    
1197    Last but not least, I made a new set of bootfiles.
1198    
1199    ----------------------------------------------------------------------
1200    Name: Matthias Blume
1201    Date: 2001/05/04 17:00:00 EDT
1202    Tag: blume-20010504-cm-lsplit
1203    Description:
1204    
1205    0. John merged pending changes to $/smlnj-lib.cm
1206    
1207    1. Allen's previous change accidentally backed out of one of Lal's
1208       earlier changes.  I undid this mistake (re-introducing Lal's change).
1209    
1210    2. I used the new topOrder' function from graph-scc.sml (from $/smlnj-lib.cm)
1211       within the compiler where applicable.  There is some code simplification
1212       because of that.
1213    
1214    3. The "split" phase (in FLINT) is now part of the default list of phases.
1215       Compiler.Control.LambdaSplitting.* can be used to globally control the
1216       lambda-splitting (cross-module-inlining) engine.  In addition to that,
1217       it can now also be controlled on a per-source basis: CM has been taught
1218       a new tool parameter applicable to ML source files.
1219    
1220       - To turn lambda-splitting off completely:
1221            local open Compiler.Control.LambdaSplitting in
1222                val _ = set Off
1223            end
1224       - To make "no lambda-splitting" the global default (but allow per-source
1225         overriding); this is the initial setting:
1226            local open Compiler.Control.LambdaSplitting in
1227                val _ = set (Default NONE)
1228            end
1229       - To make "lambda-splitting with aggressiveness a" the global default
1230         (and allow per-source overriding):
1231            local open Compiler.Control.LambdaSplitting in
1232                val _ = set (Default (SOME a))
1233            end
1234    
1235       - To turn lambda-splitting off for a given ML souce file (say: a.sml)
1236         write (in the respective .cm-file):
1237            a.sml (lambdasplitting:off)
1238       - To turn lambda-splitting for a.sml on with minimal aggressiveness:
1239            a.sml (lambdasplitting:on)
1240       - To turn lambda-splitting for a.sml on with aggressiveness <a> (where
1241         <a> is a decimal non-negative integer):
1242            a.sml (lambdasplitting:<a>)
1243       - To turn lambda-splitting for a.sml on with maximal aggressiveness:
1244            a.sml (lambdasplitting:infinity)
1245       - To use the global default for a.sml:
1246            a.sml (lambdasplitting:default)
1247         or simply
1248            a.sml
1249    
1250    ----------------------------------------------------------------------
1251    Name: Allen Leung
1252    Date: 2001/05/04 01:57:00 EDT
1253    Tag: leunga-20010504-sync
1254    Description:
1255    
1256      MLRISC features.
1257    
1258      1. Fix to CMPXCHG instructions.
1259      2. Changed RA interface to allow annotations in callbacks.
1260      3. Added a new method to the stream interface to allow annotations updates.
1261    
1262    ----------------------------------------------------------------------
1263    Name: Matthias Blume
1264    Date: 2001/05/01 11:45:00 EDT
1265    Tag: blume-20010501-pcedittmp
1266    Description:
1267    
1268    Changed install.sh to use the current working directory instead of
1269    /usr/tmp for a temporary file (pcedittmp).  The previous choice
1270    of /usr/tmp caused trouble with MacOS X because of file premission
1271    problems.
1272    
1273    ----------------------------------------------------------------------
1274    Name: Matthias Blume
1275    Date: 2001/04/20 11:10:00 EDT
1276    Tag: blume-20010420-inMLflag
1277    Description:
1278    
1279     - added vp_limitPtrMask to vproc-state.h
1280       (for use by the raw-C-calls mechanism to implement proper interrupt
1281        handling)
1282     - made the ML compiler aware of various data-structure offsets so it
1283       can generate code for accessing the vp_inML flag and vp_limitPtrMask
1284     - tweaked mlriscGen.sml to have it emit interrupt-handling code for
1285       raw C-calls
1286    
1287    ----------------------------------------------------------------------
1288    Name: Lal George
1289    Date: 2001/04/20 09:15:28 EDT
1290    Tag: george-20010420-macosX
1291    Description:
1292    
1293     - Changes to port to Mac OS X; Darwin.
1294    
1295     - In the process I found that sqrt was broken on the PPC, because the
1296       fsqrt instruction is not implemented.
1297    
1298    ----------------------------------------------------------------------
1299    Name: Matthias Blume
1300    Date: 2001/04/18 12:45:00 EDT
1301    Tag: blume-20010418-ccalls
1302    Description:
1303    
1304     - fixed two off-by-4 errors in the x86-specific c-calls implementation
1305       (this bug prevented structure arguments containing pointers from being
1306        passed correctly)
1307     - changed the raw-C-call code in mlriscGen.sml in such a way that
1308       structure arguments are represented as a pointer to the beginning
1309       of the structure (instead of having a series of synthesized arguments,
1310       one for each structure member)
1311    
1312     - made makeml script's verbosity level configurable via environment
1313       variable (MAKEML_VERBOSITY)
1314    
1315     - eliminated placeholder implementations for f32l, w16s, i16s, and f32s
1316       in rawmem-x86.sml; we are now using the real thing
1317    
1318    ----------------------------------------------------------------------
1319    Name: Matthias Blume
1320    Date: 2001/03/22 16:25:00 EST
1321    Tag: blume-20010322-bootfiles
1322    Description:
1323    
1324    Created a new set of bootfiles (for your automatic installation convenience).
1325    
1326    ----------------------------------------------------------------------
1327    Name: Matthias Blume
1328    Date: 2001/03/22 15:10:00 EST
1329    Tag: blume-20010322-rawmem-parcm
1330    Description:
1331    
1332    1. All "raw memory access" primitives for the new FFI are implemented now
1333       (at least on the x86).
1334    2. Some further cleanup of CM's parallel make mechanism.
1335    
1336    ----------------------------------------------------------------------
1337    Name: Matthias Blume
1338    Date: 2001/03/19 17:53:00 EST
1339    Tag: blume-20010319-parallel
1340    Description:
1341    
1342    Parallel make (using compile servers) now works again.
1343    
1344    To this end, CM.stabilize and CMB.make have been modified to work in
1345    two passes when compile servers are attached:
1346       1. Compile everything, do not perform stabilization; this pass
1347          uses compile servers
1348       2. Stabilize everything; this pass does not use compile servers
1349    If there are no compile servers, the two passes are combined into one
1350    (as before).  Splitting the passes increases the inherent parallelism
1351    in the dependency graph because the entire graph including all
1352    libraries is available at the same time.  This, in turn, improves
1353    server utilization.  The downside is that the master process will
1354    have to do some extra work after compilation is done (because for
1355    technical reasons it must re-read all the binfiles during stabilization).
1356    
1357    ----------------------------------------------------------------------
1358    Name: Matthias Blume
1359    Date: 2001/03/16 12:22:00 EST
1360    Tag: blume-20010316-bootfiles
1361    Description:
1362    
1363    Created a new set of bootfiles (for your automatic installation convenience).
1364    
1365    ----------------------------------------------------------------------
1366    Name: Matthias Blume
1367    Date: 2001/03/16 11:00:00 EST
1368    Tag: blume-20010316-MLTREE-fixup
1369    Description:
1370    
1371    This is a minor fixup for an (untagged) earlier commit by Allen.
1372    (A file was missing).
1373    
1374    ----------------------------------------------------------------------
1375    Name: Allen Leung
1376    Date: Mon Mar  5 18:54:57 EST 2001
1377    Tag: leunga-20010305-cut-support
1378    
1379    1. New support for alternative control-flow in MLTREE.
1380       Currently we support
1381    
1382          FLOW_TO(CALL ...., [k1,...,kn])
1383    
1384       This is needed for 'cuts to' in C-- and try/handle-like constructs
1385       in Moby
1386    
1387       New assembler flag "asm-show-cutsto" to turn on control-flow debugging.
1388    
1389    2. Register Allocator
1390    
1391       Changes in interface [from Fermin, John]
1392    
1393    3. Alpha 8-bit SLL support [Fermin]
1394    
1395    4. All architectures
1396    
1397       A new module (ClusterExpandCopies) for expanding parallel copies.
1398    
1399    ----------------------------------------------------------------------
1400    Name: Allen Leung
1401    Date: 2001/02/27 23:07:00 EST
1402    Tag: leunga-20010227-minor-stuff
1403    
1404    1. Alpha bug fix for CMOVNE
1405    2. Handle mltree COND(..,FCMP ...,...)
1406    3. Bug fix in simplifier
1407    
1408    ----------------------------------------------------------------------
1409    Name: Matthias Blume
1410    Date: 2001/01/30 17:50:00 EST
1411    Tag: blume-20010130-sync
1412    Description:
1413    
1414    This is just a minor update to sync my devel branch with the main brach.
1415    The only visible change is the addition of some README files.
1416    
1417    ----------------------------------------------------------------------
1418    Name: Matthias Blume
1419    Date: 2001/01/12 23:30:00 JST
1420    Tag: blume-20010112-bootfiles
1421    Description:
1422    
1423    Made a new set of bootfiles that goes with the current state of the
1424    repository.
1425    
1426    ----------------------------------------------------------------------
1427    Name: Matthias Blume
1428    Date: 2001/01/12 21:20:00 JST
1429    Tag: blume-20010112-sync
1430    Description:
1431    
1432    I am just flushing out some minor changes that had accumulated in
1433    my private branch in order to sync with the main tree.  (This is
1434    mainly because I had CVS trouble when trying to merge _into_ my
1435    private branch.)
1436    
1437    Most people should be completely unaffected by this.
1438    
1439    ----------------------------------------------------------------------
1440    Name: Allen Leung
1441    Date: Thu Jan 11 21:03:00 EST 2001
1442    Tag: leunga-20010111-labexp=mltree
1443    Description:
1444    
1445    1.  Removed the type LabelExp and replace it by MLTree.
1446    2.  Rewritten mltree-simplify with the pattern matcher tool.
1447    3.  There were some bugs in alpha code generator which would break
1448        64-bit code generation.
1449    4.  Redo the tools to generate code with the
1450    5.  The CM files in MLRISC (and in src/system/smlnj/MLRISC)
1451        are now generated by perl scripts.
1452    
1453    ----------------------------------------------------------------------
1454    Name: Matthias Blume
1455    Date: 2001/01/10 21:55:00 JST
1456    Tag: blume-20010110-rcc
1457    Description:
1458    
1459    The RCC stuff now seems to work (but only on the x86).
1460    This required hacking of the c-calls interface (and -implementation) in
1461    MLRISC.
1462    
1463    Normal compiler users should be unaffected.
1464    
1465    ----------------------------------------------------------------------
1466    Name: Matthias Blume
1467    Date: 2001/01/09 01:20:00 JST
1468    Tag: blume-20010109-rcc
1469    Description:
1470    
1471    This is a fairly big patch, flushing out a large number of pending
1472    changes that I made to my development copy over the last couple of days.
1473    
1474    Of practical relevance at this moment is a workaround for a pickling
1475    bug that Allen ran into the other day.  The cause of the bug itself is
1476    still unknown and it might be hard to fix it properly, but the
1477    workaround has some merits of its own (namely somewhat reducing pickling
1478    overhead for certain libraries).  Therefore, I think this solution should
1479    be satisfactory at this time.
1480    
1481    The rest of the changes (i.e., the vast majority) has to do with my
1482    ongoing efforts of providing direct support for C function calls from
1483    ML.  At the moment there is a new primop "RAW_CCALL", typing magic
1484    in types/cproto.sml (invoked from FLINT/trans/translate.sml), a new
1485    case in the FLINT CPS datatype (RCC), changes to cps/convert.sml to
1486    translate uses of RAW_CCALL into RCC, and changes to mlriscGen.sml to
1487    handle RCC.
1488    
1489    The last part (the changes to mlriscGen.sml) are still known to be
1490    wrong on the x86 and not implemented on all other architectures.  But
1491    the infrastructure is in place. I had to change a few functor
1492    signatures in the backend to be able to route the CCalls interface
1493    from MLRISC there, and I had to specialize the mltree type (on the
1494    x86) to include the necessary extensions. (The extensions themselves
1495    were already there and redy to go in MLRISC/x86).
1496    
1497    Everything should be very happy as soon as someone helps me with
1498    mlriscGen.sml...
1499    
1500    In any case, nothing of this should matter to anyone as long as the
1501    new primop is not being used (which is going to be the case unless you
1502    find it where I hid it :). The rest of the compiler is completely
1503    unaffected.
1504    
1505    ----------------------------------------------------------------------
1506    Name: Matthias Blume
1507    Date: 2001/01/05 00:30:00 JST
1508    Tag: blume-20010105-primops
1509    Description:
1510    
1511    Added some experimental support for work that I am doing right now.
1512    These changes mostly concern added primops, but there is also a new
1513    experimental C library in the runtime system (but currently not enabled
1514    anywhere except on Linux/X86).
1515    
1516    In the course of adding primops (and playing with them), I discovered that
1517    Zhong's INL_PRIM hack (no type info for certain primops) was, in fact, badly
1518    broken.  (Zhong was very right he labeled this stuff as "major gross hack".)
1519    To recover, I made type information in INL_PRIM mandatory and changed
1520    prim.sml as well as built-in.sml accordingly.  The InLine structure now
1521    has complete, correct type information (i.e., no bottom types).
1522    
1523    Since all these changes mean that we need new binfiles, I also bumped the
1524    version number to 110.32.1.
1525    
1526    ----------------------------------------------------------------------
1527    Name: Matthias Blume
1528    Date: 2000/12/30 22:10:00 JST
1529    Tag: blume-20001230-various
1530    Description:
1531    
1532    Added proxy libraries for MLRISC and let MLRISC libraries refer
1533    to each other using path anchors.  (See CM manual for explanation.)
1534    
1535    Updated CM documentation.
1536    
1537    Fixed some bugs in CM.
1538    
1539    Implemented "proxy" libraries (= syntactic sugar for CM).
1540    
1541    Added "-quiet" option to makeml and changed runtime system accordingly.
1542    
1543    Added cleanup handler for exportML to reset timers and compiler stats.
1544    
1545    ----------------------------------------------------------------------
1546    Name: Lal George
1547    Date: 2000/12/22 22:22:58 EST 2000
1548    Tag: Release_110_32
1549    Description:
1550    
1551            Infinite precision used throughout MLRISC.
1552            see MLRISC/mltree/machine-int.sig
1553    
1554    ----------------------------------------------------------------------
1555    Name: Matthias Blume
1556    Date: 2000/12/22 23:16:00 JST
1557    Tag: blume-20001222-warn
1558    Description:
1559    
1560    Corrected wording and formatting of some CM warning message which I
1561    broke in my previous patch.
1562    
1563    ----------------------------------------------------------------------
1564    Name: Matthias Blume
1565    Date: 2000/12/22 21:20:00 JST
1566    Tag: blume-20001222-anchorenv
1567    Description:
1568    
1569    Fixed CM's handling of anchor environments in connection with CMB.make.
1570    
1571    ----------------------------------------------------------------------
1572    Name: Matthias Blume
1573    Date: 2000/12/22 13:15:00 JST
1574    Tag: blume-20001222-cleanup
1575    Description:
1576    
1577    Removed src/cm/ffi which does not (and did not) belong here.
1578    
1579    ----------------------------------------------------------------------
1580    Name: Matthias Blume
1581    Date: 2000/12/21 23:55:00 JST
1582    Tag: blume-20001221-exn
1583    Description:
1584    
1585    Probably most important: CM no longer silently swallows all exceptions
1586    in the compiler.
1587    Plus: some other minor CM changes.  For example, CM now reports some
1588    sizes for generated binfiles (code, data, envpickle, lambdapickle).
1589    
1590    ----------------------------------------------------------------------
1591    Name: Matthias Blume
1592    Date: 2000/12/15 00:01:05 JST
1593    Tag: blume-20001215-dirtool
1594    Description:
1595    
1596    - "dir" tool added.
1597    - improvements and cleanup to Tools structure
1598    - documentation updates
1599    
1600    ----------------------------------------------------------------------
1601    Name: Allen Leung
1602    Date: Thu Dec 14 03:45:24 EST 2000
1603    Description:
1604    Tag:  leunga-20001214-int-inf
1605    Description:
1606    
1607       In IntInf, added these standard functions, which are missing from our
1608    implementation:
1609    
1610        andb : int * int -> int
1611        xorb : int * int -> int
1612        orb  : int * int -> int
1613        notb : int -> int
1614         <<   : int * word -> int
1615        ~>>  : int * word -> int
1616    
1617       Not tested, I hope they are correct.
1618    
1619    ----------------------------------------------------------------------
1620    Name: Allen Leung
1621    Date: Fri Dec  8 19:23:26 EST 2000
1622    Description:
1623    Tag:  leunga-20001208-nowhere
1624    Description:
1625    
1626      Slight improvements to the 'nowhere' tool to handle OR-patterns,
1627    to generate better error messages etc.  Plus a brief manual.
1628    
1629    ----------------------------------------------------------------------
1630    Name: Lal George
1631    Date: 2000/12/08 09:54:02 EST 2000
1632    Tag: Release_110_31
1633    Description:
1634    
1635    - Version 110.31
1636    ----------------------------------------------------------------------
1637    Name: Allen Leung
1638    Date: Thu Dec  7 22:01:04 EST 2000
1639    Tag:  leunga-20001207-cell-monster-hack
1640    Description:
1641    
1642    Major MLRISC internal changes.  Affect all clients.
1643    Summary:
1644    
1645    1.  Type CELLS.cell = int is now replaced by a datatype.
1646        As a result, the old regmap is now gone.  Almost all interfaces
1647        in MLRISC change as a consequence.
1648    
1649    2.  A new brand version of machine description tool (v3.0) that generates
1650        modules expecting the new interface.  The old version is removed.
1651    
1652    3.  The RA interface has been further abstracted into two new functors.
1653        RISC_RA and X86RA.  These functors have much simpler interfaces.
1654        [See also directory MLRISC/demo.]
1655    
1656    4.  Some other new source->source code generation tools are available:
1657    
1658        a. MLRISC/Tools/RewriteGen -- generate rewriters from rules.
1659        b. MLRISC/Tools/WhereGen -- expands conditional pattern matching rules.
1660           I use this tool to generate the peephole optimizers---with the new
1661           cell type changes, peephole rules are becoming difficult to write
1662           without conditional pattern matching.
1663    
1664    5.  More Intmap -> IntHashTable change.  Previous changes by Matthias didn't
1665        cover the entire MLRISC source tree so many things broke.
1666    
1667    6.  CM files have been moved to the subdirectory MLRISC/cm.
1668        They are moved because there are a lot of them and they clutter up the
1669        root dir.
1670    
1671    7.  More detailed documentation to come...
1672    
1673        NOTE: To rebuild from 110.30 (ftp distribution), you'll have to do
1674        a makeml -rebuild first.  This is because of other other
1675        changes that Matthias has made (see below).
1676    
1677    
1678    ----------------------------------------------------------------------
1679    Name: Matthias Blume
1680    Date: 2000/11/30 23:12:00 JST
1681    Tag: blume-20001130-filereorg
1682    Description:
1683    
1684    Some manual updates and some file reorganizations in CM.
1685    
1686    ----------------------------------------------------------------------
1687    Name: Matthias Blume
1688    Date: 2000/11/24 17:45:00 JST
1689    Tag: blume-20001124-link
1690    Description:
1691    
1692    Drastically improved link traversal code for the case that the dynamic
1693    value was already loaded at bootstrap time.  As a result, CM and CMB
1694    now both load blazingly fast -- even on a very slow machine.  Also,
1695    memory consumption has been further reduced by this.
1696    
1697    Warning: The format of the PIDMAP file has changed.  THerefore, to
1698    bootstrap you have to do this:
1699    
1700    1. Run CMB.make
1701    2. Make a symbolic link for the boot directory:
1702         ln -s sml.boot.ARCH-OS xxx
1703    3. "Rebuild" the boot directory:
1704         ./makeml -boot xxx -rebuild sml ; rm xxx
1705    4. Boot normally:
1706          ./makeml
1707    
1708    ----------------------------------------------------------------------
1709    Name: Matthias Blume
1710    Date: 2000/11/21 21:20:00 JST
1711    Tag: blume-20001121-tools
1712    Description:
1713    
1714    Continued hacking on autoloading problem -- with success this time.
1715    Also changed tool-plugin mechanism.  See new CM manual.
1716    
1717    ----------------------------------------------------------------------
1718    Name: Matthias Blume
1719    Date: 2000/11/19 14:30:00 JST
1720    Tag:  blume-20001119-autoload
1721    Description:
1722    
1723    Some hacking to make autoloading faster.  Success for CMB, no success
1724    so far for CM.  There is a reduced structure CM' that autoloads faster.
1725    (This is a temporary, non-documented hack to be eliminated again when
1726    the general problem is solved.)
1727    
1728    ----------------------------------------------------------------------
1729    Name: Matthias Blume
1730    Date: 2000/11/17 14:10:00 JST
1731    Tag: blume-20001117-pickle-lib
1732    Description:
1733    
1734    1. Eliminated comp-lib.cm
1735    2. Made pickle-lib.cm
1736    3. Eliminated all uses of intset.sml (from comp-lib.cm)
1737    4. Replaced all uses of intmap.{sig,sml} (from comp-lib.cm) with
1738       equivalent constructs from smlnj-lib.cm (INtHashTable).
1739    5. Point 4. also goes for those uses of intmap.* in MLRISC.
1740       Duplicated intmap modules thrown out.
1741    6. Hunted down all duplicated SCC code and replaced it with
1742       equivalent stuff (GraphSCCFn from smlnj-lib.cm).
1743    7. Rewrote Feedback module.
1744    8. Moved sortedlist.sml into viscomp-lib.cm.  Eventually it
1745       should be thrown out and equivalent modules from smlnj-lib.cm
1746       should be used (IntRedBlackSet, IntListSet, ...).
1747    
1748    Confirmed that compiler compiles to fixpoint.
1749    
1750    ----------------------------------------------------------------------
1751    Name: Allen Leung
1752    Date: 2000/11/10 18:00:00
1753    Tag: leunga-20001110-new-x86-fp
1754    
1755    A new x86 floating point code generator has been added.
1756    By default this is turned off.  To turn this on, do:
1757    
1758        CM.autoload "$smlnj/compiler.cm";
1759        Compiler.Control.MLRISC.getFlag "x86-fast-fp" := true;
1760    
1761    Changes:
1762    
1763    1.  Changed FTAN to FPTAN so that the assembly output is correct.
1764    2.  Changed the extension callback for FTANGENT to generate:
1765    
1766              fptan
1767              fstp  %st(0)
1768        instead of
1769              fptan
1770              fstpl ftempmem
1771    
1772    3.  Numerous assembly fixes for x86.
1773    
1774    5.  Cleaned up the machine code output module x86/x86MC.sml and added
1775        support for a whole bunch of instructions and addressing modes:
1776    
1777          fadd/fsub/fsubr/fmul/fdiv/fdivr  %st, %st(n)
1778          faddp/fsubp/fsubrp/fmulp/fdivp/fdivrp  %st, %st(n)
1779          fadd/fsub/fsubr/fmul/fdiv/fdivr  %st(n), %st
1780          fiadd/fisub/fisubr/fimul/fidiv/fidivr mem
1781          fxch %st(n)
1782          fld %st(n)
1783          fst %st(n)
1784          fst mem
1785          fstp %st(n)
1786          fucom %st(n)
1787          fucomp %st(n)
1788    
1789        All these are now generated when the fast fp mode is turned on.
1790    
1791    6.  Removed the dedicated registers %st(0), ..., %st(7) from X86CpsRegs
1792    
1793    ----------------------------------------------------------------------
1794    Name: Matthias Blume
1795    Date: 2000/11/09 11:20:00 JST
1796    Tag: blume-20001109-scc
1797    Description:
1798    
1799    Eliminated some code duplication:
1800    
1801    1. Added "where" clause to GraphSCCFn in SML/NJ Library.
1802       (Otherwise the functor is useless.)
1803    2. Used GraphSCCFn where SCCUtilFun was used previously.
1804    3. Got rid of SCCUtilFun (in comp-lib.cm).
1805    
1806    ----------------------------------------------------------------------
1807    Name: Lal George
1808    Date: 2000/11/06 09:02:21 EST 2000
1809    Tag: Release_110_30
1810    Description:
1811    
1812    - Version 110.30
1813    ----------------------------------------------------------------------
1814    Name: Matthias Blume
1815    Date: 2000/11/04 14:45:00
1816    Tag: blume-20001104-mlbuild
1817    Description:
1818    
1819    - Made ml-build faster on startup.
1820    - Documentation fixes.
1821    
1822    ----------------------------------------------------------------------
1823    Name: Matthias Blume
1824    Date: 2000/11/02 17:00:00 JST
1825    Tag: blume-20001102-condcomp
1826    Description:
1827    
1828    - Small tweaks to pickler -- new BOOTFILES!
1829    - Version bumped to 110.29.2.
1830    - Added conditional compilation facility to init.cmi (see comment there).
1831    ----------------------------------------------------------------------
1832    Name: Allen Leung
1833    Date: 2000/10/23 19:31:00
1834    Tag: leunga-20001023-demo-ra
1835    
1836    1. Minor RA changes that improves spilling on x86 (affects Moby and C-- only)
1837    2. Test programs for the graph library updated
1838    3. Some new MLRISC demo programs added
1839    
1840    ----------------------------------------------------------------------
1841    Name: Matthias Blume
1842    Date: 2000/08/31 22:15:00 JST
1843    Tag: blume-20001017-errmsg
1844    Description:
1845    
1846    More error message grief: Where there used to be no messages, there
1847    now were some that had bogus error regions.  Fixed.
1848    
1849    ----------------------------------------------------------------------
1850    Name: Matthias Blume
1851    Date: 2000/08/31 17:30:00 JST
1852    Tag: blume-20001017-v110p29p1
1853    Description:
1854    
1855    I made a version 110.29.1 with new bootfiles.
1856    
1857    Changes:  Modified pickler/unpickler for faster and leaner unpickling.
1858              CM documentation changes and a small bugfix in CM's error reporting.
1859    
1860    ----------------------------------------------------------------------
1861    Name: Lal George
1862    Date: 2000/09/27 14:42:35 EDT
1863    Tag: george-20000927-nodestatus
1864    Description:
1865    
1866    Changed the type of the nodestatus, so that:
1867    
1868            SPILLED(~1)             is now SPILLED
1869            SPILLED(m) where m>=0   is now MEMREG(m)
1870            SPILLED(s) where s<~1   is now SPILL_LOC(~s)
1871    
1872    ----------------------------------------------------------------------
1873    Name: Matthias Blume
1874    Date: 2000/09/07 14:45:00 JST
1875    Tag: blume-20000907-cmerrmsg
1876    Description:
1877    
1878    Small tweak to CM to avoid getting ML syntax error messages twice.
1879    
1880    ----------------------------------------------------------------------
1881    Name: Matthias Blume
1882    Date: 2000/08/31 18:00:00 JST
1883    Tag: blume-20000831-cvsbootfiles
1884    Description:
1885    
1886    New URL for boot files (because the 110.29 files on the BL server do
1887    now work correctly with my updated install scripts for yacc and lex).
1888    
1889    ----------------------------------------------------------------------
1890    Name: Matthias Blume
1891    Date: 2000/08/08 12:33:00 JST
1892    Tag: blume-20000808-manual
1893    Description:
1894    
1895    Tiny update to CM manual.
1896    
1897    ----------------------------------------------------------------------
1898    Name: Allen Leung
1899    Date: 2000/08/7 19:31:00
1900    Tag: leunga-20000807-a-whole-bunch-of-stuff
1901    
1902      Moby, C--, SSA, x86, machine descriptions etc.  Should only affect C--
1903    and Mobdy.
1904    
1905    1.  x86
1906    
1907       a.  Fixes to peephole module by John and Dan.
1908       b.  Assembly fix to SETcc by Allen.
1909       c.  Fix to c-call by John.
1910       d.  Fix to spilling by John.  (This one deals with the missing FSTPT case)
1911       e.  Instruction selection optimization to SETcc as suggested by John.
1912    
1913           For example,
1914    
1915            MV(32, x, COND(32, CMP(32, LT, a, b), LI 1, LI 0))
1916    
1917           should generate:
1918    
1919            MOVL a, x
1920            SUBL b, x
1921            SHRL 31, x
1922    
1923    2.  IR stuff
1924    
1925         A bunch of new DJ-graph related algorithms added.  These
1926         speed up SSA construction.
1927    
1928    3.  SSA + Scheduling
1929    
1930         Added code for SSA and scheduling to the repository
1931    
1932    ----------------------------------------------------------------------
1933    Name: Lal George
1934    Date: 2000/07/27 11:53:14 EDT
1935    
1936    Tag: lal-20000727-linux-ppc
1937    Description:
1938    
1939     Made changes to support Linux PPC.
1940     p.s. I have confirmation that the 110.29 boot files work fine.
1941    
1942    ----------------------------------------------------------------------
1943    Name: Matthias Blume
1944    Date: 2000/07/27 17:40:00 JST
1945    Tag: blume-20000727-scripts
1946    Description:
1947    
1948    !!!! WARNING !!!!
1949    You must recompile the runtime system!
1950    !!!! WARNING !!!!
1951    
1952    This is basically another round of script-enhancements:
1953    
1954    1. sml, ml-build, and ml-makedepend accept options -D and -U to define
1955       and undefine CM preprocessor symbols.
1956    
1957    2. ml-build avoids generating a new heap image if it finds that the
1958       existing one is still ok.  (The condition is that no ML file had to
1959       be recompiled and all ML files are found to be older that the heap
1960       file.)
1961    
1962       To make this work smoothly, I also hacked the runtime system as
1963       well as SMLofNJ.SysInfo to get access to the heap image suffix
1964       (.sparc-solaris, ...) that is currently being used.
1965    
1966       Moreover, the signature of CM.mk_standalone has changed.  See the
1967       CM manual.
1968    
1969    3. ml-makedepend accepts additional options -n, -a, and -o.  (See the
1970       CM manual for details.)
1971    
1972    4. More CM manual updates:
1973        - all of the above has been documented.
1974        - there is now a section describing the (CM-related) command line
1975          arguments that are accepted by the "sml" command
1976    
1977    ----------------------------------------------------------------------
1978    Name: Matthias Blume
1979    Date: 2000/07/25 16:20:00 JST
1980    Tag: blume-20000725-makedepend
1981    Description:
1982    
1983    Added a script called ml-makedepend.  This can be used in makefiles
1984    for Unix' make in a way very similar to the "makedepend" command for
1985    C.
1986    
1987    The script internally uses function CM.sources.
1988    
1989    Synopsis:
1990    
1991        ml-makedepend [-f makefile] cmfile targetname
1992    
1993    The default for the makefile is "makefile" (or "Makefile" should
1994    "makefile" not exist).
1995    
1996    ml-makedepend adds a cmfile/targetname-specific section to this
1997    makefile (after removing the previous version of this section).  The
1998    section contains a single dependency specification with targetname on
1999    the LHS (targetname is an arbitrary name), and a list of files derived
2000    from the cmfile on the RHS.  Some of the files on the RHS are
2001    ARCH/OPSYS-specific.  Therefore, ml-makedepend inserts references to
2002    "make" variables $(ARCH) and $(OPSYS) in place of the corresponding
2003    path names.  The makefile writer is responsible for making sure that
2004    these variables have correct at the time "make" is invoked.
2005    
2006    ----------------------------------------------------------------------
2007    Name: Matthias Blume
2008    Date: 2000/07/22 23:30:00 JST
2009    Tag: blume-20000722-urlupdate
2010    Description:
2011    
2012    Changed BOOT and config/srcarchiveurl to point to BL server:
2013    
2014        ftp://ftp.research.bell-labs.com/dist/smlnj/working/110.29/
2015    
2016    ----------------------------------------------------------------------
2017    Name: Matthias Blume
2018    Date: 2000/07/18 18:00:00 JST
2019    Tag: blume-20000718-Version_110_29
2020    Description:
2021    
2022    1. Updated src/compiler/TopLevel/main/version.sml to version 110.29
2023    
2024    2. Updated config/version to 110.29
2025    
2026    3. Updated config/srcarchiveurl
2027    
2028    3. New boot files!
2029       ftp://ftp.cs.princeton.edu/pub/people/blume/sml/110.29-autofetch
2030    
2031    ----------------------------------------------------------------------
2032    Name: Matthias Blume
2033    Date: 2000/07/11 13:58:00 JST
2034    Tag: blume-20000711-doctypo
2035    Description:
2036    
2037    Fixed a few typos in CM manual.
2038    
2039    ----------------------------------------------------------------------
2040    Name: Allen Leung
2041    Date: 2000/06/15 00:38:00
2042    Tag: leunga-20000704-sparc-x86
2043    
2044    1. x86 peephole improvement sp += k; sp -= k => nop  [from John]
2045    2. fix to x86 RET bug [found by Dan Grossman]
2046    3. sparc assembly bug fix for ticc instructions [found by Fermin]
2047    
2048       Affects c-- and moby only
2049    
2050    ----------------------------------------------------------------------
2051    Name: Matthias Blume
2052    Date: 2000/07/04 15:26:00
2053    Tag: blume-20000704-trigger
2054    Description:
2055    
2056    1. Improvements to CM manual.
2057    2. SMLofNJ.Internals.BTrace.trigger reinstated as an alternative way
2058       of getting a back-trace.  The function, when called, raises an
2059       internal exception which explicitly carries the full back-trace history,
2060       so it is unaffected by any intervening handle-raise pairs ("trivial"
2061       or not).  The interactive loop will print that history once it arrives
2062       at top level.
2063       Short of having all exceptions implicitly carry the full history, the
2064       recommended way of using this facility is:
2065         - compile your program with instrumentation "on"
2066         - run it, when it raises an exception, look at the history
2067         - if the history is "cut off" because of some handler, go and modify
2068           your program so that it explicitly calls BTrace.trigger
2069         - recompile (still instrumented), and rerun; look at the full history
2070    
2071    ----------------------------------------------------------------------
2072    Name: Matthias Blume
2073    Date: 2000/07/03 15:36:00 JST
2074    Tag: blume-20000702-manual
2075    Description:
2076    
2077    Small corrections and updates to CM manual.
2078    
2079    ----------------------------------------------------------------------
2080    Name: Matthias Blume
2081    Date: 2000/06/29 16:04:00 JST
2082    Tag: blume-20000629-yacctool
2083    Description:
2084    
2085    Changes:
2086    
2087    1. Class "mlyacc" now takes separate arguments to pass options to
2088       generated .sml- and .sig-files independently.
2089    2. Corresponding CM manual updates.
2090    3. BTrace module now also reports call sites.  (However, for loop clusters
2091       it only shows from where the cluster was entered.)  There are associated
2092       modifications to core.sml, internals.{sig,sml}, btrace.sml, and btimp.sml.
2093    
2094    ----------------------------------------------------------------------
2095    Name: Matthias Blume
2096    Date: 2000/06/27 16:51:00 JST
2097    Tag: blume-20000627-noweb
2098    Description:
2099    
2100    Changes:
2101    
2102     1. Implemented "subdir" and "witness" options for noweb tool.
2103        This caused some slight internal changes in CM's tool implementation.
2104     2. Fixed bug in "tool plugin" mechanism.  This is essentially cleaning
2105        some remaining issues from earlier path anchor changes.
2106     3. Updated CM manual accordingly.
2107    
2108     4. Changed implementation of back-tracing so that I now consider it
2109        ready for prime-time.
2110    
2111        In particular, you don't have to explicitly trigger the back-trace
2112        anymore.  Instead, if you are running BTrace-instrumented code and
2113        there is an uncaught exception (regardless of whether or not it was
2114        raised in instrumented code), the top-level evalloop will print
2115        the back-trace.
2116    
2117        Features:
2118    
2119          - Instrumented and uninstrumented code work together seemlessly.
2120            (Of course, uninstrumented code is never mentioned in actual
2121             back-traces.)
2122    
2123          - Asymptotic time- and space-complexity of instrumented code is
2124            equal to that of uninstrumented code.  (This means that
2125            tail-recursion is preserved by the instrumentation phase.)
2126    
2127          - Modules whose code has been instrumented in different sessions
2128            work together without problem.
2129    
2130          - There is no penalty whatsoever on uninstrumented code.
2131    
2132          - There is no penalty on "raise" expressions, even in
2133            instrumented code.
2134    
2135        A potential bug (or perhaps it is a feature, too):
2136    
2137          A back-trace reaches no further than the outermost instrumented
2138          non-trivial "raise".  Here, a "trivial" raise is one that is the
2139          sole RHS of a "handle" rule.  Thus, back-traces reach trough
2140    
2141               <exp> handle e => raise e
2142    
2143          and even
2144    
2145               <exp> handle Foo => raise Bar
2146    
2147          and, of course, through
2148    
2149               <exp> handle Foo => ...
2150    
2151         if the exception was not Foo.
2152    
2153         Back-traces always reach right through any un-instrumented code
2154         including any of its "handle" expressions, trivial or not.
2155    
2156       To try this out, do the following:
2157    
2158         - Erase all existing binfiles for your program.
2159           (You may keep binfiles for those modules where you think you
2160            definitely don't need back-tracing.)
2161         - Turn on back-trace instrumentation:
2162              SMLofNJ.Internals.BTrace.mode (SOME true);
2163         - Recompile your program.  (I.e., run "CM.make" or "use".)
2164         - You may now turn instrumentation off again (if you want):
2165              SMLofNJ.Internals.BTrace.mode (SOME false);
2166         - Run your program as usual.  If it raises an exception that
2167           reaches the interactive toplevel, then a back-trace will
2168           automatically be printed.  After that, the toplevel loop
2169           will print the exception history as usual.
2170    
2171    ----------------------------------------------------------------------
2172    Name: Matthias Blume
2173    Date: 2000/06/26 09:56:46 JST
2174    Tag: blume-20000626-setup
2175    Description:
2176    
2177    CM: - setup-parameter to "sml" added; this can be used to run arbitrary
2178          ML code before and after compiling a file (e.g., to set compiler
2179          flags)
2180    
2181    Compiler: - improved btrace API (in core.sml, internals.{sig,sml})
2182              - associated changes to btrace.sml (BTrace instrumentation pass)
2183              - cleaner implementation of btimp.sml (BTrace tracing and report
2184                module)
2185    
2186    CM manual: * new path encoding documented
2187               * description of setup-parameter to "sml" added
2188    
2189    The biggest user-visible change to back-tracing is that it is no
2190    longer necessary to compile all traced modules within the same
2191    session.  (This was a real limitation.)
2192    
2193    ----------------------------------------------------------------------
2194    Name: Matthias Blume
2195    Date: 2000/06/24 12:40:00 JST
2196    Tag: blume-20000624-startup
2197    Description:
2198    
2199    Fixes startup slowdown problem.  (I was calling SrcPath.sync a _tad_
2200    bit too often -- to put it mildly. :)
2201    
2202    ----------------------------------------------------------------------
2203    Name: Matthias Blume
2204    Date: 2000/06/23 18:20:00 JST
2205    Tag: blume-20000623-btrace
2206    Description:
2207    
2208    This updates adds a backtrace facility to aid programmers in debugging
2209    their programs.  This involves the following changes:
2210    
2211    1. Module system/smlnj/init/core.sml (structure _Core) now has hooks for
2212       keeping track of the current call stack.  When programs are compiled
2213       in a special mode, the compiler will insert calls to these hooks
2214       into the user program.
2215       "Hook" means that it is possible for different implementations of
2216       back-tracing to register themselves (at different times).
2217    
2218    2. compiler/MiscUtil/profile/btrace.sml implements the annotation phase
2219       as an Absyn.dec->Absyn.dec rewrite.  Normally this phase is turned off.
2220       It can be turned on using this call:
2221         SMLofNJ.Internals.BTrace.mode (SOME true);
2222       Turning it off again:
2223         SMLofNJ.Internals.BTrace.mode (SOME false);
2224       Querying the current status:
2225         SMLofNJ.Internals.BTrace.mode NONE;
2226       Annotated programs are about twice as big as normal ones, and they
2227       run a factor of 2 to 4 slower with a dummy back-trace plugin (one
2228       where all hooks do nothing).  The slowdown with a plugin that is
2229       actually useful (such as the one supplied by default) is even greater,
2230       but in the case of the default plugin it is still only an constant
2231       factor (amortized).
2232    
2233    3. system/Basis/Implementation/NJ/internals.{sig,sml} have been augmented
2234       with a sub-structure BTrace for controlling back-tracing.  In particular,
2235       the above-mentioned function "mode" controls whether the annotation
2236       phase is invoked by the compiler.  Another important function is
2237       "trigger": when called it aborts the current execution and causes
2238       the top-level loop to print a full back-trace.
2239    
2240    4. compiler/MiscUtil/profile/btimp.sml is the current default plugin
2241       for back-tracing.  It keeps track of the dynamic call stack and in
2242       addition to that it keeps a partial history at each "level" of that
2243       stack.  For example, if a tail-calls b, b tail-calls c, and c tail-calls
2244       d and b (at separate times, dynamically), then the report will show:
2245    
2246       GOTO   d
2247             /c
2248       GOTO  \b
2249       CALL   a
2250    
2251       This shows that there was an initial non-tail call of a, then a
2252       tail-call to b or c, looping behavior in a cluster of functions that
2253       consist of b and c, and then a goto from that cluster (i.e., either from
2254       b or from c) to d.
2255    
2256       Note that (depending on the user program) the amount of information
2257       that the back-trace module has to keep track of at each level is bounded
2258       by a constant.  Thus, the whole implementation has the same asymptotical
2259       complexity as the original program (both in space and in time).
2260    
2261    5. compiler/TopLevel/interact/evalloop.sml has been modified to
2262       handle the special exception SMLofNJ.Internals.BTrace.BTrace
2263       which is raised by the "trigger" function mentioned above.
2264    
2265    Notes on usage:
2266    
2267    - Annotated code works well together with unannotated code:
2268    Unannotated calls simply do not show up at all in the backtrace.
2269    
2270    - It is not a good idea to let modules that were annotated during
2271    different sessions run at the same time.  This is because the compiler
2272    chooses small integers to identify individual functions, and there
2273    will be clashes if different modules were compiled in separate sessions.
2274    (Nothing will crash, and you will even be told about the clashes, but
2275    back-trace information will in general not be useful.)
2276    
2277    - Back-tracing can be confused by callcc and capture.
2278    
2279    - The only way of getting a back-trace right now is to explicitly
2280    invoke the "trigger" function from your user program.  Eventually, we
2281    should make every exception carry back-trace information (if
2282    available).  But since this creates more overhead at "raise"-time
2283    (similar to the current exnHistory overhead), I have not yet
2284    implemented this.  (The implementation will be rather easy.)  With
2285    exceptions carrying back-trace information, this facility will be even
2286    more useful because users don't need to modify their programs...
2287    
2288    - While it is possible to compile the compiler with back-trace
2289    annotations turned on (I did it to get some confidence in
2290    correctness), you must make absolutely sure that core.sml and
2291    btimp.sml are compiled WITHOUT annotation!  (core.sml cannot actually
2292    be compiled with annotation because there is no core access yet, but
2293    if you compile btimp.sml with annotation, then the system will go into
2294    an infinite recursion and crash.)
2295    Since CM currently does not know about BTrace, the only way to turn
2296    annotations on and off for different modules of the compiler is to
2297    interrupt CMB.make, change the settings, and re-invoke it.  Of course,
2298    this is awkward and clumsy.
2299    
2300    Sample sessions:
2301    
2302    Standard ML of New Jersey v110.28.1 [FLINT v1.5], June 5, 2000
2303    - SMLofNJ.Internals.BTrace.mode (SOME true);
2304    [autoloading]
2305    [autoloading done]
2306    val it = false : bool
2307    - structure X = struct
2308    -     fun main n = let
2309    -         fun a (x, 0) = d x
2310    -           | a (x, n) = b (x, n - 1)
2311    -         and b (x, n) = c (x, n)
2312    -         and c (x, n) = a (x, n)
2313    -         and d x = e (x, 3)
2314    -         and e (x, 0) = f x
2315    -           | e (x, n) = e (x, n - 1)
2316    -         and f 0 = SMLofNJ.Internals.BTrace.trigger ()
2317    -           | f n = n * g (n - 1)
2318    -         and g n = a (n, 3)
2319    -     in
2320    -         f n
2321    -     end
2322    - end;
2323    structure X : sig val main : int -> int end
2324    - X.main 3;
2325    *** BACK-TRACE ***
2326    GOTO   stdIn:4.2-13.20: X.main[2].f
2327    GOTO-( stdIn:4.2-13.20: X.main[2].e
2328    GOTO   stdIn:4.2-13.20: X.main[2].d
2329         / stdIn:4.2-13.20: X.main[2].a
2330         | stdIn:4.2-13.20: X.main[2].b
2331    GOTO-\ stdIn:4.2-13.20: X.main[2].c
2332    CALL   stdIn:4.2-13.20: X.main[2].g
2333    GOTO   stdIn:4.2-13.20: X.main[2].f
2334    GOTO-( stdIn:4.2-13.20: X.main[2].e
2335    GOTO   stdIn:4.2-13.20: X.main[2].d
2336         / stdIn:4.2-13.20: X.main[2].a
2337         | stdIn:4.2-13.20: X.main[2].b
2338    GOTO-\ stdIn:4.2-13.20: X.main[2].c
2339    CALL   stdIn:4.2-13.20: X.main[2].g
2340    GOTO   stdIn:4.2-13.20: X.main[2].f
2341    GOTO-( stdIn:4.2-13.20: X.main[2].e
2342    GOTO   stdIn:4.2-13.20: X.main[2].d
2343         / stdIn:4.2-13.20: X.main[2].a
2344         | stdIn:4.2-13.20: X.main[2].b
2345    GOTO-\ stdIn:4.2-13.20: X.main[2].c
2346    CALL   stdIn:4.2-13.20: X.main[2].g
2347    GOTO   stdIn:4.2-13.20: X.main[2].f
2348    CALL   stdIn:2.15-17.4: X.main[2]
2349    -
2350    
2351    (Note that because of a FLINt bug the above code currently does not
2352    compile without BTrace turned on.)
2353    
2354    Here is another example, using my modified Tiger compiler:
2355    
2356    Standard ML of New Jersey v110.28.1 [FLINT v1.5], June 5, 2000
2357    - SMLofNJ.Internals.BTrace.mode (SOME true);
2358    [autoloading]
2359    [autoloading done]
2360    val it = false : bool
2361    - CM.make "sources.cm";
2362    [autoloading]
2363    ...
2364    [autoloading done]
2365    [scanning sources.cm]
2366    [parsing (sources.cm):parse.sml]
2367    [creating directory CM/SKEL ...]
2368    [parsing (sources.cm):tiger.lex.sml]
2369    ...
2370    [wrote CM/sparc-unix/semant.sml]
2371    [compiling (sources.cm):main.sml]
2372    [wrote CM/sparc-unix/main.sml]
2373    [New bindings added.]
2374    val it = true : bool
2375    - Main.compile ("../testcases/merge.tig", "foo.out");
2376    *** BACK-TRACE ***
2377    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trvar
2378    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
2379    CALL   lib/semant.sml:289.3-295.22: SemantFun[2].transExp.trexp.check[2]
2380    GOTO   lib/semant.sml:289.3-295.22: SemantFun[2].transExp.trexp.check[2]
2381    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
2382    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
2383    CALL   lib/semant.sml:488.3-505.6: SemantFun[2].transDec.trdec[2].transBody[2]
2384         / lib/semant.sml:411.65-543.8: SemantFun[2].transDec
2385    CALL-\ lib/semant.sml:413.2-540.9: SemantFun[2].transDec.trdec[2]
2386    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
2387    CALL   lib/semant.sml:8.52-558.4: SemantFun[2].transProg[2]
2388    CALL   main.sml:1.18-118.4: Main.compile[2]
2389    -
2390    
2391    ----------------------------------------------------------------------
2392    Name: Matthias Blumen
2393    Date: 2000/06/21 18:00:00 JST
2394    Tag: blume-20000621-manual
2395    Description:
2396    
2397    CM manual update: Path environments documented.
2398    
2399    ----------------------------------------------------------------------
2400    Name: Matthias Blume
2401    Date: 2000/06/19 13:40:00
2402    Tag: blume-20000619-manual
2403    Description:
2404    
2405    CM manual and system/README update.  This only covers the fact that
2406    there are no more implicit anchors.  (Path environments and the "bind"
2407    option to "cm" have yet to be documented.)
2408    
2409    ----------------------------------------------------------------------
2410    Name: Matthias Blume
2411    Date: 2000/06/19 11:05:00 JST
2412    Tag: blume-20000619-chdir-bugfix
2413    Description:
2414    
2415    Fixed a bug in new SrcPath module that sometimes led to a bad chDir call.
2416    
2417    ----------------------------------------------------------------------
2418    Name: Matthias Blume
2419    Date: 2000/06/18 22:00:10 JST
2420    Tag: blume-20000618-implicit-anchors-really-gone
2421    Description:
2422    
2423    I updates the previous HISTORY entry where I forgot to mention that
2424    implicit anchors are no longer with us.
2425    
2426    The current update also gets rid of the (now useless) controller
2427    CM.Control.implicit_anchors.
2428    
2429    ----------------------------------------------------------------------
2430    Name: Matthias Blume
2431    Date: 2000/06/16 17:30:00 JST
2432    Tag: blume-20000616-anchorenv
2433    Description:
2434    
2435    This patch implements the long anticipated (just kidding :) "anchor
2436    environment" mechanism.  In the course of doing this, I also
2437    re-implemented CM's internal "SrcPath" module from scratch.  The new
2438    one should be more robust in certain boundary cases.  In any case, it
2439    is a lot cleaner than its predecessor (IMHO).
2440    
2441    This time, although there is yet another boot file format change, I
2442    kept the unpickler backward-compatible.  As a result, no new bootfiles
2443    are necessary and bootstrapping is straightforward.  (You cannot read
2444    new bootfiles into an old system, but the other way around is no
2445    problem.)
2446    
2447    Visible changes:
2448    
2449    ** 0. Implicit path anchors (without the leading $-symbol) are no
2450    longer recognized at all. This means that such path names are not
2451    illegal either.  For example, the name basis.cm simply refers to a
2452    local file called "basis.cm" (i.e, the name is an ordinary path
2453    relative to .cm-files directory).  Or, to put it differently, only
2454    names that start with $ are anchored paths.
2455    
2456    ** 1. The $<singlearc> abbreviation for $/<singlearc> has finally
2457    vanished.
2458    
2459    John (Reppy) had critizised this as soon as I originally proposed and
2460    implemented it, but at that time I did not really deeply believe
2461    him. :) Now I came full-circle because I need the $<singlearc> syntax
2462    in another place where it cannot be seen as an abbreviation for
2463    $/<singlearc>.  To avoid the confusion, $<singlearc> now means what it
2464    seems to mean (i.e., it "expands" into the corresponding anchor
2465    value).
2466    
2467    However, when paths are used as members in CM description files, it
2468    continues to be true that there must be at least another arc after the
2469    anchor.  This is now enforced separately during semantic analysis
2470    (i.e., from a lexical/syntactical point of view, the notation is ok.)
2471    
2472    ** 2. The "cm" class now accepts an option "bind".  The option's value
2473    is a sub-option list of precisely two items -- one labeled "anchor"
2474    and the other one labeled "value".  As you might expect, "anchor" is
2475    used to specify an anchor name to be bound, and "value" specifies what
2476    the anchor is being bound to.
2477    
2478    The value must be a directory name and can be given in either standard
2479    syntax (including the possibility that it is itself an anchored path)
2480    or native syntax.
2481    
2482    Examples:
2483    
2484       foo.cm (bind:(anchor:bar value:$mystuff/bar))
2485       lib.cm (bind:(anchor:a value:"H:\\x\\y\\z"))  (* only works under windows *)
2486    
2487    and so on.
2488    
2489    The meaning of this is that the .cm-file will be processed with an
2490    augmented anchor environment where the given anchor(s) is/are bound to
2491    the given values(s).
2492    
2493    The rationale for having this feature is this: Suppose you are trying
2494    to use two different (already stable) libraries a.cm and b.cm (that
2495    you perhaps didn't write yourself).  Further, suppose each of these
2496    two libraries internally uses its own auxiliary library $aux/lib.cm.
2497    Normally you would now have a problem because the anchor "lib" can not
2498    be bound to more than one value globally.  Therefore, the project that
2499    uses both a.cm and b.cm must locally redirect the anchor to some other
2500    place:
2501    
2502       a.cm (bind:(anchor:lib value:/usr/lib/smlnj/a-stuff))
2503       b.cm (bind:(anchor:lib value:/usr/lib/smlnj/b-stuff))
2504    
2505    This hard-wires $lib/aux.cm to /usr/lib/smlnj/a-stuff/aux.cm or
2506    /usr/lib/smlnj/b-stuff/aux.cm, respectively.
2507    
2508    Hard-wiring path names is a bit inflexible (and CM will verbosely warn
2509    you when you do so at the time of CM.stabilize).  Therefore, you can
2510    also use an anchored path as the value:
2511    
2512      a.cm (bind:(anchor:lib value:$a-lib))
2513      b.cm (bind:(anchor:lib value:$b-lib))
2514    
2515    Now you can globally configure (using the usual CM.Anchor.anchor or
2516    pathconfig machinery) bindings for "a-lib" and "b-lib".  Since "lib"
2517    itself is always locally bound, setting it globally is no longer
2518    meaningful or necessary (but it does not hurt either).  In fact, "lib"
2519    can still be used as a global anchor for separate purposes.  As a
2520    matter of fact, one can locally define "lib" in terms of a global
2521    "lib":
2522    
2523      a.cm (bind:(anchor:lib value:$lib/a))
2524      b.cm (bind:(anchor:lib value:$lib/b))
2525    
2526    ** 3: The encoding of path names has changed.  This affects the way
2527    path names are shown in CM's progress report and also the internal
2528    protocol encoding used for parallel make.
2529    
2530    The encoding now uses one or more ':'-separated segments.  Each
2531    segments corresponds to a file that has been specified relative to the
2532    file given by its preceding segment.  The first segment is either
2533    relative to the CWD, absolute, or anchored.  Each segment itself is
2534    basically a Unix pathname; all segments but the first are relative.
2535    
2536    Example:
2537    
2538       $foo/bar/baz.cm:a/b/c.sml
2539    
2540    This path denotes the file bar/a/b/c.sml relative to the directory
2541    denoted by anchor "foo".  Notice that the encoding also includes
2542    baz.cm which is the .cm-file that listed a/b/c.sml.  As usual, such
2543    paths are resolved relative to the .cm-files directory, so baz.cm must
2544    be ignored to get the "real" pathname.
2545    
2546    To make this fact more obvious, CM puts the names of such "virtual
2547    arcs" into parentheses when they appear in progress reports. (No
2548    parentheses will appear in the internal protocol encoding.)  Thus,
2549    what you really see is:
2550    
2551      $foo/bar/(baz.cm):a/b/c.sml
2552    
2553    I find this notation to be much more informative than before.
2554    
2555    Another new feature of the encoding is that special characters
2556    including parentheses, colons, (back)slashes, and white space are
2557    written as \ddd (where ddd is the decimal encoding of the character).
2558    
2559    *** The CM manual still needs to be updated.
2560    
2561    ----------------------------------------------------------------------
2562  Name: Allen Leung  Name: Allen Leung
2563  Date: 2000/06/15 00:38:00  Date: 2000/06/15 00:38:00
2564  Tag: leunga-20000615-x86-peephole  Tag: leunga-20000615-x86-peephole
# Line 798  Line 3345 
3345       elaborator). There were a lot of changes during my "linkpath" trials       elaborator). There were a lot of changes during my "linkpath" trials
3346       that could have been reverted to their original state but weren't.       that could have been reverted to their original state but weren't.
3347       Please, don't be too harsh on me for messing with this code a bit more       Please, don't be too harsh on me for messing with this code a bit more
3348       than what was strictly necessary...  (I _did_ resist the tempation       than what was strictly necessary...  (I _did_ resist the temptation
3349       of doing any "global reformatting" to avoid an untimely death at       of doing any "global reformatting" to avoid an untimely death at
3350       Dave's hands. :)       Dave's hands. :)
3351    

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