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revision 602, Thu Apr 6 05:31:24 2000 UTC revision 683, Wed Jul 5 00:42:19 2000 UTC
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13  Description:  Description:
14  ----------------------------------------------------------------------  ----------------------------------------------------------------------
15  Name: Allen Leung  Name: Allen Leung
16    Date: 2000/06/15 00:38:00
17    Tag: leunga-20000704-sparc-x86
18    
19    1. x86 peephole improvement sp += k; sp -= k => nop  [from John]
20    2. fix to x86 RET bug [found by Dan Grossman]
21    3. sparc assembly bug fix for ticc instructions [found by Fermin]
22    
23       Affects c-- and moby only
24    
25    ----------------------------------------------------------------------
26    Name: Matthias Blume
27    Date: 2000/07/04 15:26:00
28    Tag: blume-20000704-trigger
29    Description:
30    
31    1. Improvements to CM manual.
32    2. SMLofNJ.Internals.BTrace.trigger reinstated as an alternative way
33       of getting a back-trace.  The function, when called, raises an
34       internal exception which explicitly carries the full back-trace history,
35       so it is unaffected by any intervening handle-raise pairs ("trivial"
36       or not).  The interactive loop will print that history once it arrives
37       at top level.
38       Short of having all exceptions implicitly carry the full history, the
39       recommended way of using this facility is:
40         - compile your program with instrumentation "on"
41         - run it, when it raises an exception, look at the history
42         - if the history is "cut off" because of some handler, go and modify
43           your program so that it explicitly calls BTrace.trigger
44         - recompile (still instrumented), and rerun; look at the full history
45    
46    ----------------------------------------------------------------------
47    Name: Matthias Blume
48    Date: 2000/07/03 15:36:00 JST
49    Tag: blume-20000702-manual
50    Description:
51    
52    Small corrections and updates to CM manual.
53    
54    ----------------------------------------------------------------------
55    Name: Matthias Blume
56    Date: 2000/06/29 16:04:00 JST
57    Tag: blume-20000629-yacctool
58    Description:
59    
60    Changes:
61    
62    1. Class "mlyacc" now takes separate arguments to pass options to
63       generated .sml- and .sig-files independently.
64    2. Corresponding CM manual updates.
65    3. BTrace module now also reports call sites.  (However, for loop clusters
66       it only shows from where the cluster was entered.)  There are associated
67       modifications to core.sml, internals.{sig,sml}, btrace.sml, and btimp.sml.
68    
69    ----------------------------------------------------------------------
70    Name: Matthias Blume
71    Date: 2000/06/27 16:51:00 JST
72    Tag: blume-20000627-noweb
73    Description:
74    
75    Changes:
76    
77     1. Implemented "subdir" and "witness" options for noweb tool.
78        This caused some slight internal changes in CM's tool implementation.
79     2. Fixed bug in "tool plugin" mechanism.  This is essentially cleaning
80        some remaining issues from earlier path anchor changes.
81     3. Updated CM manual accordingly.
82    
83     4. Changed implementation of back-tracing so that I now consider it
84        ready for prime-time.
85    
86        In particular, you don't have to explicitly trigger the back-trace
87        anymore.  Instead, if you are running BTrace-instrumented code and
88        there is an uncaught exception (regardless of whether or not it was
89        raised in instrumented code), the top-level evalloop will print
90        the back-trace.
91    
92        Features:
93    
94          - Instrumented and uninstrumented code work together seemlessly.
95            (Of course, uninstrumented code is never mentioned in actual
96             back-traces.)
97    
98          - Asymptotic time- and space-complexity of instrumented code is
99            equal to that of uninstrumented code.  (This means that
100            tail-recursion is preserved by the instrumentation phase.)
101    
102          - Modules whose code has been instrumented in different sessions
103            work together without problem.
104    
105          - There is no penalty whatsoever on uninstrumented code.
106    
107          - There is no penalty on "raise" expressions, even in
108            instrumented code.
109    
110        A potential bug (or perhaps it is a feature, too):
111    
112          A back-trace reaches no further than the outermost instrumented
113          non-trivial "raise".  Here, a "trivial" raise is one that is the
114          sole RHS of a "handle" rule.  Thus, back-traces reach trough
115    
116               <exp> handle e => raise e
117    
118          and even
119    
120               <exp> handle Foo => raise Bar
121    
122          and, of course, through
123    
124               <exp> handle Foo => ...
125    
126         if the exception was not Foo.
127    
128         Back-traces always reach right through any un-instrumented code
129         including any of its "handle" expressions, trivial or not.
130    
131       To try this out, do the following:
132    
133         - Erase all existing binfiles for your program.
134           (You may keep binfiles for those modules where you think you
135            definitely don't need back-tracing.)
136         - Turn on back-trace instrumentation:
137              SMLofNJ.Internals.BTrace.mode (SOME true);
138         - Recompile your program.  (I.e., run "CM.make" or "use".)
139         - You may now turn instrumentation off again (if you want):
140              SMLofNJ.Internals.BTrace.mode (SOME false);
141         - Run your program as usual.  If it raises an exception that
142           reaches the interactive toplevel, then a back-trace will
143           automatically be printed.  After that, the toplevel loop
144           will print the exception history as usual.
145    
146    ----------------------------------------------------------------------
147    Name: Matthias Blume
148    Date: 2000/06/26 09:56:46 JST
149    Tag: blume-20000626-setup
150    Description:
151    
152    CM: - setup-parameter to "sml" added; this can be used to run arbitrary
153          ML code before and after compiling a file (e.g., to set compiler
154          flags)
155    
156    Compiler: - improved btrace API (in core.sml, internals.{sig,sml})
157              - associated changes to btrace.sml (BTrace instrumentation pass)
158              - cleaner implementation of btimp.sml (BTrace tracing and report
159                module)
160    
161    CM manual: * new path encoding documented
162               * description of setup-parameter to "sml" added
163    
164    The biggest user-visible change to back-tracing is that it is no
165    longer necessary to compile all traced modules within the same
166    session.  (This was a real limitation.)
167    
168    ----------------------------------------------------------------------
169    Name: Matthias Blume
170    Date: 2000/06/24 12:40:00 JST
171    Tag: blume-20000624-startup
172    Description:
173    
174    Fixes startup slowdown problem.  (I was calling SrcPath.sync a _tad_
175    bit too often -- to put it mildly. :)
176    
177    ----------------------------------------------------------------------
178    Name: Matthias Blume
179    Date: 2000/06/23 18:20:00 JST
180    Tag: blume-20000623-btrace
181    Description:
182    
183    This updates adds a backtrace facility to aid programmers in debugging
184    their programs.  This involves the following changes:
185    
186    1. Module system/smlnj/init/core.sml (structure _Core) now has hooks for
187       keeping track of the current call stack.  When programs are compiled
188       in a special mode, the compiler will insert calls to these hooks
189       into the user program.
190       "Hook" means that it is possible for different implementations of
191       back-tracing to register themselves (at different times).
192    
193    2. compiler/MiscUtil/profile/btrace.sml implements the annotation phase
194       as an Absyn.dec->Absyn.dec rewrite.  Normally this phase is turned off.
195       It can be turned on using this call:
196         SMLofNJ.Internals.BTrace.mode (SOME true);
197       Turning it off again:
198         SMLofNJ.Internals.BTrace.mode (SOME false);
199       Querying the current status:
200         SMLofNJ.Internals.BTrace.mode NONE;
201       Annotated programs are about twice as big as normal ones, and they
202       run a factor of 2 to 4 slower with a dummy back-trace plugin (one
203       where all hooks do nothing).  The slowdown with a plugin that is
204       actually useful (such as the one supplied by default) is even greater,
205       but in the case of the default plugin it is still only an constant
206       factor (amortized).
207    
208    3. system/Basis/Implementation/NJ/internals.{sig,sml} have been augmented
209       with a sub-structure BTrace for controlling back-tracing.  In particular,
210       the above-mentioned function "mode" controls whether the annotation
211       phase is invoked by the compiler.  Another important function is
212       "trigger": when called it aborts the current execution and causes
213       the top-level loop to print a full back-trace.
214    
215    4. compiler/MiscUtil/profile/btimp.sml is the current default plugin
216       for back-tracing.  It keeps track of the dynamic call stack and in
217       addition to that it keeps a partial history at each "level" of that
218       stack.  For example, if a tail-calls b, b tail-calls c, and c tail-calls
219       d and b (at separate times, dynamically), then the report will show:
220    
221       GOTO   d
222             /c
223       GOTO  \b
224       CALL   a
225    
226       This shows that there was an initial non-tail call of a, then a
227       tail-call to b or c, looping behavior in a cluster of functions that
228       consist of b and c, and then a goto from that cluster (i.e., either from
229       b or from c) to d.
230    
231       Note that (depending on the user program) the amount of information
232       that the back-trace module has to keep track of at each level is bounded
233       by a constant.  Thus, the whole implementation has the same asymptotical
234       complexity as the original program (both in space and in time).
235    
236    5. compiler/TopLevel/interact/evalloop.sml has been modified to
237       handle the special exception SMLofNJ.Internals.BTrace.BTrace
238       which is raised by the "trigger" function mentioned above.
239    
240    Notes on usage:
241    
242    - Annotated code works well together with unannotated code:
243    Unannotated calls simply do not show up at all in the backtrace.
244    
245    - It is not a good idea to let modules that were annotated during
246    different sessions run at the same time.  This is because the compiler
247    chooses small integers to identify individual functions, and there
248    will be clashes if different modules were compiled in separate sessions.
249    (Nothing will crash, and you will even be told about the clashes, but
250    back-trace information will in general not be useful.)
251    
252    - Back-tracing can be confused by callcc and capture.
253    
254    - The only way of getting a back-trace right now is to explicitly
255    invoke the "trigger" function from your user program.  Eventually, we
256    should make every exception carry back-trace information (if
257    available).  But since this creates more overhead at "raise"-time
258    (similar to the current exnHistory overhead), I have not yet
259    implemented this.  (The implementation will be rather easy.)  With
260    exceptions carrying back-trace information, this facility will be even
261    more useful because users don't need to modify their programs...
262    
263    - While it is possible to compile the compiler with back-trace
264    annotations turned on (I did it to get some confidence in
265    correctness), you must make absolutely sure that core.sml and
266    btimp.sml are compiled WITHOUT annotation!  (core.sml cannot actually
267    be compiled with annotation because there is no core access yet, but
268    if you compile btimp.sml with annotation, then the system will go into
269    an infinite recursion and crash.)
270    Since CM currently does not know about BTrace, the only way to turn
271    annotations on and off for different modules of the compiler is to
272    interrupt CMB.make, change the settings, and re-invoke it.  Of course,
273    this is awkward and clumsy.
274    
275    Sample sessions:
276    
277    Standard ML of New Jersey v110.28.1 [FLINT v1.5], June 5, 2000
278    - SMLofNJ.Internals.BTrace.mode (SOME true);
279    [autoloading]
280    [autoloading done]
281    val it = false : bool
282    - structure X = struct
283    -     fun main n = let
284    -         fun a (x, 0) = d x
285    -           | a (x, n) = b (x, n - 1)
286    -         and b (x, n) = c (x, n)
287    -         and c (x, n) = a (x, n)
288    -         and d x = e (x, 3)
289    -         and e (x, 0) = f x
290    -           | e (x, n) = e (x, n - 1)
291    -         and f 0 = SMLofNJ.Internals.BTrace.trigger ()
292    -           | f n = n * g (n - 1)
293    -         and g n = a (n, 3)
294    -     in
295    -         f n
296    -     end
297    - end;
298    structure X : sig val main : int -> int end
299    - X.main 3;
300    *** BACK-TRACE ***
301    GOTO   stdIn:4.2-13.20: X.main[2].f
302    GOTO-( stdIn:4.2-13.20: X.main[2].e
303    GOTO   stdIn:4.2-13.20: X.main[2].d
304         / stdIn:4.2-13.20: X.main[2].a
305         | stdIn:4.2-13.20: X.main[2].b
306    GOTO-\ stdIn:4.2-13.20: X.main[2].c
307    CALL   stdIn:4.2-13.20: X.main[2].g
308    GOTO   stdIn:4.2-13.20: X.main[2].f
309    GOTO-( stdIn:4.2-13.20: X.main[2].e
310    GOTO   stdIn:4.2-13.20: X.main[2].d
311         / stdIn:4.2-13.20: X.main[2].a
312         | stdIn:4.2-13.20: X.main[2].b
313    GOTO-\ stdIn:4.2-13.20: X.main[2].c
314    CALL   stdIn:4.2-13.20: X.main[2].g
315    GOTO   stdIn:4.2-13.20: X.main[2].f
316    GOTO-( stdIn:4.2-13.20: X.main[2].e
317    GOTO   stdIn:4.2-13.20: X.main[2].d
318         / stdIn:4.2-13.20: X.main[2].a
319         | stdIn:4.2-13.20: X.main[2].b
320    GOTO-\ stdIn:4.2-13.20: X.main[2].c
321    CALL   stdIn:4.2-13.20: X.main[2].g
322    GOTO   stdIn:4.2-13.20: X.main[2].f
323    CALL   stdIn:2.15-17.4: X.main[2]
324    -
325    
326    (Note that because of a FLINt bug the above code currently does not
327    compile without BTrace turned on.)
328    
329    Here is another example, using my modified Tiger compiler:
330    
331    Standard ML of New Jersey v110.28.1 [FLINT v1.5], June 5, 2000
332    - SMLofNJ.Internals.BTrace.mode (SOME true);
333    [autoloading]
334    [autoloading done]
335    val it = false : bool
336    - CM.make "sources.cm";
337    [autoloading]
338    ...
339    [autoloading done]
340    [scanning sources.cm]
341    [parsing (sources.cm):parse.sml]
342    [creating directory CM/SKEL ...]
343    [parsing (sources.cm):tiger.lex.sml]
344    ...
345    [wrote CM/sparc-unix/semant.sml]
346    [compiling (sources.cm):main.sml]
347    [wrote CM/sparc-unix/main.sml]
348    [New bindings added.]
349    val it = true : bool
350    - Main.compile ("../testcases/merge.tig", "foo.out");
351    *** BACK-TRACE ***
352    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trvar
353    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
354    CALL   lib/semant.sml:289.3-295.22: SemantFun[2].transExp.trexp.check[2]
355    GOTO   lib/semant.sml:289.3-295.22: SemantFun[2].transExp.trexp.check[2]
356    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
357    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
358    CALL   lib/semant.sml:488.3-505.6: SemantFun[2].transDec.trdec[2].transBody[2]
359         / lib/semant.sml:411.65-543.8: SemantFun[2].transDec
360    CALL-\ lib/semant.sml:413.2-540.9: SemantFun[2].transDec.trdec[2]
361    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
362    CALL   lib/semant.sml:8.52-558.4: SemantFun[2].transProg[2]
363    CALL   main.sml:1.18-118.4: Main.compile[2]
364    -
365    
366    ----------------------------------------------------------------------
367    Name: Matthias Blumen
368    Date: 2000/06/21 18:00:00 JST
369    Tag: blume-20000621-manual
370    Description:
371    
372    CM manual update: Path environments documented.
373    
374    ----------------------------------------------------------------------
375    Name: Matthias Blume
376    Date: 2000/06/19 13:40:00
377    Tag: blume-20000619-manual
378    Description:
379    
380    CM manual and system/README update.  This only covers the fact that
381    there are no more implicit anchors.  (Path environments and the "bind"
382    option to "cm" have yet to be documented.)
383    
384    ----------------------------------------------------------------------
385    Name: Matthias Blume
386    Date: 2000/06/19 11:05:00 JST
387    Tag: blume-20000619-chdir-bugfix
388    Description:
389    
390    Fixed a bug in new SrcPath module that sometimes led to a bad chDir call.
391    
392    ----------------------------------------------------------------------
393    Name: Matthias Blume
394    Date: 2000/06/18 22:00:10 JST
395    Tag: blume-20000618-implicit-anchors-really-gone
396    Description:
397    
398    I updates the previous HISTORY entry where I forgot to mention that
399    implicit anchors are no longer with us.
400    
401    The current update also gets rid of the (now useless) controller
402    CM.Control.implicit_anchors.
403    
404    ----------------------------------------------------------------------
405    Name: Matthias Blume
406    Date: 2000/06/16 17:30:00 JST
407    Tag: blume-20000616-anchorenv
408    Description:
409    
410    This patch implements the long anticipated (just kidding :) "anchor
411    environment" mechanism.  In the course of doing this, I also
412    re-implemented CM's internal "SrcPath" module from scratch.  The new
413    one should be more robust in certain boundary cases.  In any case, it
414    is a lot cleaner than its predecessor (IMHO).
415    
416    This time, although there is yet another boot file format change, I
417    kept the unpickler backward-compatible.  As a result, no new bootfiles
418    are necessary and bootstrapping is straightforward.  (You cannot read
419    new bootfiles into an old system, but the other way around is no
420    problem.)
421    
422    Visible changes:
423    
424    ** 0. Implicit path anchors (without the leading $-symbol) are no
425    longer recognized at all. This means that such path names are not
426    illegal either.  For example, the name basis.cm simply refers to a
427    local file called "basis.cm" (i.e, the name is an ordinary path
428    relative to .cm-files directory).  Or, to put it differently, only
429    names that start with $ are anchored paths.
430    
431    ** 1. The $<singlearc> abbreviation for $/<singlearc> has finally
432    vanished.
433    
434    John (Reppy) had critizised this as soon as I originally proposed and
435    implemented it, but at that time I did not really deeply believe
436    him. :) Now I came full-circle because I need the $<singlearc> syntax
437    in another place where it cannot be seen as an abbreviation for
438    $/<singlearc>.  To avoid the confusion, $<singlearc> now means what it
439    seems to mean (i.e., it "expands" into the corresponding anchor
440    value).
441    
442    However, when paths are used as members in CM description files, it
443    continues to be true that there must be at least another arc after the
444    anchor.  This is now enforced separately during semantic analysis
445    (i.e., from a lexical/syntactical point of view, the notation is ok.)
446    
447    ** 2. The "cm" class now accepts an option "bind".  The option's value
448    is a sub-option list of precisely two items -- one labeled "anchor"
449    and the other one labeled "value".  As you might expect, "anchor" is
450    used to specify an anchor name to be bound, and "value" specifies what
451    the anchor is being bound to.
452    
453    The value must be a directory name and can be given in either standard
454    syntax (including the possibility that it is itself an anchored path)
455    or native syntax.
456    
457    Examples:
458    
459       foo.cm (bind:(anchor:bar value:$mystuff/bar))
460       lib.cm (bind:(anchor:a value:"H:\\x\\y\\z"))  (* only works under windows *)
461    
462    and so on.
463    
464    The meaning of this is that the .cm-file will be processed with an
465    augmented anchor environment where the given anchor(s) is/are bound to
466    the given values(s).
467    
468    The rationale for having this feature is this: Suppose you are trying
469    to use two different (already stable) libraries a.cm and b.cm (that
470    you perhaps didn't write yourself).  Further, suppose each of these
471    two libraries internally uses its own auxiliary library $aux/lib.cm.
472    Normally you would now have a problem because the anchor "lib" can not
473    be bound to more than one value globally.  Therefore, the project that
474    uses both a.cm and b.cm must locally redirect the anchor to some other
475    place:
476    
477       a.cm (bind:(anchor:lib value:/usr/lib/smlnj/a-stuff))
478       b.cm (bind:(anchor:lib value:/usr/lib/smlnj/b-stuff))
479    
480    This hard-wires $lib/aux.cm to /usr/lib/smlnj/a-stuff/aux.cm or
481    /usr/lib/smlnj/b-stuff/aux.cm, respectively.
482    
483    Hard-wiring path names is a bit inflexible (and CM will verbosely warn
484    you when you do so at the time of CM.stabilize).  Therefore, you can
485    also use an anchored path as the value:
486    
487      a.cm (bind:(anchor:lib value:$a-lib))
488      b.cm (bind:(anchor:lib value:$b-lib))
489    
490    Now you can globally configure (using the usual CM.Anchor.anchor or
491    pathconfig machinery) bindings for "a-lib" and "b-lib".  Since "lib"
492    itself is always locally bound, setting it globally is no longer
493    meaningful or necessary (but it does not hurt either).  In fact, "lib"
494    can still be used as a global anchor for separate purposes.  As a
495    matter of fact, one can locally define "lib" in terms of a global
496    "lib":
497    
498      a.cm (bind:(anchor:lib value:$lib/a))
499      b.cm (bind:(anchor:lib value:$lib/b))
500    
501    ** 3: The encoding of path names has changed.  This affects the way
502    path names are shown in CM's progress report and also the internal
503    protocol encoding used for parallel make.
504    
505    The encoding now uses one or more ':'-separated segments.  Each
506    segments corresponds to a file that has been specified relative to the
507    file given by its preceding segment.  The first segment is either
508    relative to the CWD, absolute, or anchored.  Each segment itself is
509    basically a Unix pathname; all segments but the first are relative.
510    
511    Example:
512    
513       $foo/bar/baz.cm:a/b/c.sml
514    
515    This path denotes the file bar/a/b/c.sml relative to the directory
516    denoted by anchor "foo".  Notice that the encoding also includes
517    baz.cm which is the .cm-file that listed a/b/c.sml.  As usual, such
518    paths are resolved relative to the .cm-files directory, so baz.cm must
519    be ignored to get the "real" pathname.
520    
521    To make this fact more obvious, CM puts the names of such "virtual
522    arcs" into parentheses when they appear in progress reports. (No
523    parentheses will appear in the internal protocol encoding.)  Thus,
524    what you really see is:
525    
526      $foo/bar/(baz.cm):a/b/c.sml
527    
528    I find this notation to be much more informative than before.
529    
530    Another new feature of the encoding is that special characters
531    including parentheses, colons, (back)slashes, and white space are
532    written as \ddd (where ddd is the decimal encoding of the character).
533    
534    *** The CM manual still needs to be updated.
535    
536    ----------------------------------------------------------------------
537    Name: Allen Leung
538    Date: 2000/06/15 00:38:00
539    Tag: leunga-20000615-x86-peephole
540    
541    x86 Peephole fix by Fermin.  Affects c-- and moby only.
542    
543    ----------------------------------------------------------------------
544    Name: Matthias Blume
545    Date: 2000/06/12 11:40:00
546    Tag: blume-20000612-parmakefix
547    Description:
548    
549    More cleanup after changing the file naming scheme: This time I
550    repaired the parallel make mechanism for CMB.make which I broke earlier.
551    
552    ----------------------------------------------------------------------
553    Name: Allen Leung
554    Date: 2000/06/09 01:25:00
555    Tag: leunga-20000609-various
556    
557    None of these things should affect normal SML/NJ operations
558    
559    1. Peephole improvements provided by Fermin (c--)
560    2. New annotation DEFUSE for adding extra dependence (moby)
561    3. New X86 LOCK instructions (moby)
562    4. New machine description language for reservation tables (scheduling)
563    5. Fixes to various optimization/analysis modules (branch chaining, dominator
564       trees etc.)
565    6. I've changed the CM files so that they can work with versions
566       110.0.6, 110.25 and 110.28
567    
568    ----------------------------------------------------------------------
569    Name: Matthias Blume
570    Date: 2000/06/09 12:40:00
571    Tag: blume-20000609-log
572    Description:
573    
574    - Removed all(?) remaining RCS Log entries from sources.
575    
576    - Fixed bug in ml-yacc and ml-lex sources (use explicit anchors for
577      anchored paths).
578    
579    ----------------------------------------------------------------------
580    Name: Matthias Blume
581    Date: 2000/06/07 17:00:00 JST
582    Tag: blume-20000607-no-implicit-anchors
583    Description:
584    
585    1. This update changes the default setting for
586    CM.Control.implicit_anchors from true to false.  This means that
587    implicit anchors are no longer permitted by default.  I also tried to
588    make sure that nothing else still relies on implicit anchors.
589    (This is the next step on the schedule towards a CM that does not even
590    have the notion of implicit anchors anymore.)
591    
592    2. More CM manual updates.
593    
594    3. I managed to track down and fix the pickling bug I mentioned last
595    time.  Because of the previously existing workaround, this entails no
596    immediate practical changes.
597    
598    ----------------------------------------------------------------------
599    Name: Matthias Blume
600    Date: 2000/06/06 11:15:00 JST
601    Tag: blume-20000606-lazierpickle
602    Description:
603    
604    !!!! NEW BOOT FILES !!!!
605    
606    * The main purpose of this update is to make library pickles lazier in
607    order to reduce the initial space penalty for autoloading a library.
608    As a result, it is now possible to have $smlnj/compiler.cm
609    pre-registered.  This should take care of the many complaints or
610    inquiries about missing structure Compiler.  This required changes to
611    CM's internal data structures and small tweaks to some algorithms.
612    
613    As a neat additional effect, it is no longer necessary (for the sake
614    of lean heap image files) to distinguish between a "minimal" CM and a
615    "full" CM.  Now, there is only one CM (i.e., the "full" version:
616    $smlnj/cm.cm aka $smlnj/cm/full.cm), and it is always available at the
617    interactive top level. ($smlnj/cm/minimal.cm is gone.)
618    
619    To make the life of compiler-hackers easier, "makeml" now also
620    pre-registers $smlnj/cmb.cm (aka $smlnj/cmb/current.cm).  In other
621    words, after you bootstrap a new sml for the first time, you will not
622    have to autoload $smlnj/cmb.cm again afterwards.  (The first time
623    around you will still have to do it, though.)
624    
625    * A second change consists of major updates to the CM manual.  There
626    are now several appendices with summary information and also a full
627    specification of the CM description file syntax.
628    
629    * In directory src/system I added the script "allcross".  This script
630    invokes sml and cross-compiles the compiler for all supported
631    architectures.  (Useful when providing a new set of boot files.)
632    
633    * There seems to be a latent bug in my "lazy pickles" mechanism.  I
634    added a small tweak to pickle-util.sml to work around this problem,
635    but it is not a proper fix yet.  I will investigate further.  (The
636    effect of the bug was an inflation of library pickle size.)
637    
638    * Version number increased to 110.28.1 (to avoid compatibility problems).
639    
640    ----------------------------------------------------------------------
641    Name: Allen Leung
642    Date: 2000/05/25 17:28 EDT
643    Tag: leunga-20000525-ra
644    Description:
645    
646      Fixed a bug in freezing phase of the register allocator.
647    
648    ----------------------------------------------------------------------
649    Name: Allen Leung
650    Date: 2000/05/15 22:53 EDT
651    Tag: leunga-20000515-alpha-x86-ra
652    Description:
653    
654      1. Alpha
655    
656          Slight cleanup.  Removed the instruction SGNXL
657    
658      2. X86
659    
660          Added the following instructions to the instruction set:
661    
662            ROLx, RORx,
663            BTx, BTSx, BTLx, BTRx,
664            XCHGx, and variants with the LOCK prefix
665    
666      3. Register Allocation
667    
668          The module ra-rewrite-with-renaming has been improved.
669    
670      These have no effect on SML/NJ.
671    
672    ----------------------------------------------------------------------
673    Name: Matthias Blume
674    Date: 2000/05/15 16:20:00 JST
675    Tag: blume-20000515-lightrebuild
676    Description:
677    
678    1. I added an alternative to "-rebuild" to "makeml".  The difference is
679       that prior to calling CMB.make' the CM-variable "LIGHT" will be
680       defined.  In effect, the command will not build any cross-compiler
681       backends and therefore finish more quickly.
682    
683       The "fixpt" script also takes a "-light" switch to be able to use
684       this new facility while compiling for a fixpoint.
685    
686    2. I replaced all mentions of anchored paths in group owner specifications
687       with simple relative paths (usually starting with "..").
688       The rationale is that a library's internal workings should not be
689       compromised by the lack of some anchor.  (An anchor is necessary
690       for someone who wants to refer to the library by an anchored path,
691       but it should not be necessary to build the same library in the first
692       place.)
693    
694    3. I changed the way CM's tool mechanism determines the shell command
695       string used for things like ml-yacc etc. so that it does not break
696       when CM.Control.implicit_anchors is turned off.
697    
698    ----------------------------------------------------------------------
699    Name: Matthias Blume
700    Date: 2000/05/12 18:20:00 JST
701    Tag: blume-20000512-ml-build
702    Description:
703    
704    Fixed a bug in config/_ml-build that prevented ml-yacc and ml-lex from
705    getting installed properly (by config/install.sh).
706    
707    ----------------------------------------------------------------------
708    Name: Matthias Blume
709    Date: 2000/05/12 17:30:00 JST
710    Tag: blume-20000512-anchors
711    Description:
712    
713    !!! NEW BOOT FILES !!!
714    
715    This change is in preparation of fading out support for "implicitly
716    anchored path names".  I went through all sources and used the
717    explicit (and relatively new) $-notation.  See system/README and the
718    CM manual for more info on this.
719    
720    I also modified the anchoring scheme for some things such as "smlnj",
721    "MLRISC", "cm", etc. to take advantage of the fact that explicit
722    anchors are more expressive: anchor name and first arc do not have to
723    coincide.  This entails the following user-visible change:
724    
725    You have to write $smlnj/foo/bar instead of smlnj/foo/bar.  In
726    particular, when you fire up sml with a command-line argument, say,
727    e.g.:
728    
729       sml '$smlnj/cmb.cm'
730    
731    At the ML toplevel prompt:
732    
733       CM.autoload "$smlnj/cmb.cm";
734    
735    There is also a new controller in CM.Control that can be used to turn
736    off all remaining support for implicit anchors by saying:
737    
738        CM.autoload "$smlnj/
739        #set CM.Control.implicit_anchors false;
740    
741    This causes CM to reject implicitly anchored paths.  This is (for the
742    time being) less permissive than the "final" version where there will
743    be no more such implicit anchors and relative paths will be just that:
744    relative.
745    
746    The next step (version after next version?) will be to make the
747    default for CM.Control.implicit_anchors false.  After the dust has
748    settled, I can then produce the "final" version of this...
749    
750    Note: Since bootstrapping is a bit tricky, I provided new boot files.
751    
752    ----------------------------------------------------------------------
753    Name: Matthias Blume
754    Date: 2000/05/11 16:30:00 JST
755    Tag: blume-20000511-sources
756    Description:
757    
758    The main change is that I added function CM.sources as a generalized
759    version of the earlier CM.makedepend.  This entails the following
760    additional changes:
761    
762      - CM.makedepend has been dropped.
763    
764      - CM manual has been updated.
765    
766      - TOOLS signature and API have been changed.
767    
768    ----------------------------------------------------------------------
769    Name: Allen Leung
770    Date: 2000/05/10 21:17 EDT
771    Tag: leunga-20000510-moby-c--ssa
772    Description:
773    
774      Various bug fixes and new features for C--, Moby and MLRISC optimizations.
775    None of these affect SML/NJ.
776    
777    1. Register Allocation
778    
779        a. A new ra spilling module (ra/ra-spill-with-renaming) is implemented.
780           This module tries to remove local (i.e. basic block level) redundancies
781           during spilling.
782    
783        b. A new framework for performing region based register allocation.
784           Not yet entirely functional.
785    
786    2. X86
787    
788       a. DefUse for POP was missing the stack pointer [found by Lal]
789       b. Reload for CALL was incorrect in X86Spill [found by John]
790       c. Various fixes in X86Spill so that it can be used correctly for
791          the new spilling module.
792    
793    3. SSA/IR
794    
795       a. New module ir/dj-dataflow.sml implements elimination based
796          data flow analysis.
797    
798    4. MLRiscGen
799    
800       a. Fix for gc type annotation
801    
802    5. MDGen
803    
804       Various fixes for machine description -> ml code translation.  For ssa
805       only.
806    
807    ----------------------------------------------------------------------
808    Name: Allen Leung
809    Date: 2000/05/08 22:17 EDT
810    Tag: leunga-20000508-labexp
811    Description:
812    
813      Fermin has found a few assembly problems with constant expressions
814      generated in LabelExp.  Mostly, the problems involve extra parentheses,
815      which choke on dumb assemblers.  This is his fix.
816    
817    ----------------------------------------------------------------------
818    Name: Dave MacQueen
819    Date: 2000/04/09 14:00 EDT
820    Tag: dbm-20000502-Version_110_28
821    Description:
822    
823    1. Updated src/compiler/TopLevel/main/version.sml to version 110.28
824    
825    2. Updated config/version to 110.28
826    
827    3. Updated config/srcarchiveurl
828    
829    3. New boot files!
830       ftp://ftp.research.bell-labs.com/dist/smlnj/working/110.28/
831    
832    ----------------------------------------------------------------------
833    Name: Matthias Blume
834    Date: 2000/05/01 19:05:00 JST
835    Tag: blume-20000501-noweb
836    Description:
837    
838    A new noweb tool has been added.  The existing system is entirely
839    unaffected by this, but some CM users have asked for renewed noweb
840    support.  Everything is documented in the CM manual.
841    
842    New (plugin) libraries:
843    
844       noweb-tool.cm
845       nw-ext.cm
846    
847    ----------------------------------------------------------------------
848    Name: Dave MacQueen
849    Date: 2000/04/30 12:40PM EDT
850    Tag: dbm-20000430-bug_fixes
851    Description:
852    
853    1. Fix for bug 1498
854       smlnj/src/system/Basis/Implementation/Unsafe/object.sig
855       smlnj/src/system/Basis/Implementation/Unsafe/object.sml
856         added toRealArray function
857       smlnj/src/compiler/MiscUtil/print/ppobj.sml
858         added check for tag Obj.RealArray to array printing case in ppObj
859    
860    2. Fix for bug 1510
861       smlnj/src/compiler/Semant/types/typesutil.sml
862         fixed definition of dummyargs (used by equalTycon) so that
863         dummy args are distinct types
864    
865    ----------------------------------------------------------------------
866    Name: Matthias Blume
867    Date: 2000/04/30 01:00:00 JST
868    Tag: blume-20000430-versions
869    Description:
870    
871    1. CM version numbering added.  This is an implementation of Lal's
872       proposal for adding version numbers and version checking to .cm
873       files.  Lal said that his proposal was just that -- a proposal.
874       For the time being I went ahead and implemented it so that people
875       can comment on it.  Everything is completely backward-compatible
876       (except for the stable library format, i.e., new bootfiles!).
877    
878       As usual, see the CM manual for details.
879    
880    2. An alternative syntax for anchored paths has been implemented.
881       Dave has recently voiced the same concerns that I had when I did
882       this, so there should be some support.  My take is that eventually
883       I will let support for the current syntax (where anchors are
884       "implicit") fade out in favor of the new, explicit syntax.
885       In order to be backward-compatible, both old and new syntax are
886       currently supported.
887    
888       Again, see the CM manual for details.
889    
890    3. Parallel make is trying to be slightly smarter:  When the master
891       process finds a "bottleneck", i.e., when there is only one
892       compilation unit that can be compiled and everybody else is
893       waiting on it, then it will simply compile it directly instead
894       of clumsily telling one of the slaves to do it.
895    
896    4. Support for "unsharing" added.  This is necessary in order to be
897       able to have two different versions of the same library running
898       at the same time (e.g., for trying out a new MLRISC while still
899       having the old MLRISC linked into the current compiler, etc.)
900       See the CM manual.
901    
902    5. Simple "makedepend" functionality added for generating Makefile
903       dependency information.  (This is rather crude at the moment.
904       Expect some changes here in the future.)
905    
906    6. ".fun" added as a recognized suffix for ML files. Also documented
907       explicitly in the manual that the fallback behavior (unknown suffix
908       -> ML file) is not an official feature!
909    
910    7. Small changes to the pickler for stable libraries.
911    
912    8. Several internal changes to CM (for cleanup/improvement).
913    
914    
915    !!!! NEW BINFILES !!!!
916    
917    ----------------------------------------------------------------------
918    Name: Matthias Blume
919    Date: 2000/04/28 17:30:00 JST
920    Tag: blume-20000428-pathconfig
921    Description:
922    
923    1. I changed config/install.sh to remove duplicate entries from the
924       lib/pathconfig file at the end.  Moreover, the final version of
925       lib/pathconfig is sorted alphabetically.  The same (sorting) is done
926       in src/system/installml.
927    
928    2. The config/install.sh script now consistently uses relative
929       pathnames in lib/pathconfig whenever the anchor is in the lib
930       directory.  (So far this was true for the libraries that come
931       pre-compiled and bundled as part of the bootfiles but not for
932       libraries that are compiled by the script itself.)
933    
934    ----------------------------------------------------------------------
935    Name: Matthias Blume
936    Date: 2000/04/26 13:10:00 JST
937    Tag: blume-20000426-fun_suffix
938    Description:
939    
940    Added ".fun" as a recognized file name suffix (for ML code).
941    
942    ----------------------------------------------------------------------
943    Name: Allen Leung
944    Date: 2000/04/25 17:00:00 EST
945    Tag: leunga-20000425-alpha-ra
946    Description:
947    
948    1. Alpha
949    
950        PSEUDOARITH was missing in AlphaRewrite.  This causes an endless loop
951    in C--.
952    
953    2. RA
954    
955       Added a flag "ra-dump-size" to print out the size of the flowgraph
956       and the interference graph.
957    
958    ----------------------------------------------------------------------
959    Name: Dave MacQueen
960    Date: 2000/04/25/
961    Tag: dbm-20000425-mlyacc_doc_examples
962    Description:
963      Updated mlyacc.tex sections 5 and 7 for SML '97 and CM.
964      Updated all three examples in src/ml-yacc/examples to run
965      under 110.* using CM.make.
966    
967    ----------------------------------------------------------------------
968    Name: Allen Leung
969    Date: 2000/04/20 23:04:00 EST
970    Tag: leunga-20000420-ssa-c---stuff
971    Description:
972    
973      This update synchronizes my repository with Yale's.  Most of these
974    changes, however, do not affect SML/NJ at all (the RA is an exception).
975    
976    1. Register Allocator
977    
978       a. An improvement in the interference graph construction:
979          Given a copy
980    
981                s <- t
982    
983          no interference edge between s and t is added for this definition of s.
984    
985       b. I've added two new spill heuristic modules that Fermin and I developed
986          (in the new library RA.cm). These are unused in SML/NJ but maybe
987          useful for others (Moby?)
988    
989    2. X86
990    
991       a. Various fixes in the backend provided by Fermin [C--] and Lal.
992    
993    3. Alpha
994    
995       a. Added the BSR instruction and code generation that goes with it [C--]
996       b. Other fixes too numerous to recount provided by Fermin [C--]
997    
998    4. Regmaps
999    
1000       a. The regmaps are not initialized with the identity physical bindings
1001          at creation time.  This is unneeded.
1002    
1003    5. MLRISC Optimizations
1004    
1005       a. The DJ-Graph module can now compute the iterated dominance frontiers
1006          intersects with liveness incrementally in linear time! Woohoo!
1007          This is now used in my new SSA construction algorithm.
1008    
1009       b. THe branch reorganization module is now smarter about linear chains of
1010          basic blocks.
1011    
1012    
1013    ----------------------------------------------------------------------
1014    Name: Matthias Blume
1015    Date: 2000/04/12 13:52:00 JST
1016    Tag: blume_main_v110p27_1
1017    Description:
1018    
1019    Changed install.sh script to handle archive files without version number
1020    and to use "boot.<arch>-<os>" instead of "sml.boot.<arch>-<os>" for the
1021    name of the boot file archive.
1022    
1023    ----------------------------------------------------------------------
1024    Name: Dave MacQueen
1025    Date: 2000/04/09 14:00 EDT
1026    Tag: dbm-20000410-Version_110_27
1027    Description:
1028    
1029    1. Updated src/compiler/TopLevel/main/version.sml to version 110.27
1030    
1031    2. Updated src/config/version to 110.27
1032    
1033    3. New boot files!
1034    
1035    ----------------------------------------------------------------------
1036    Name: Allen Leung
1037    Date: 2000/04/09 19:09:00 EST
1038    Tag: leunga-20000409-misc
1039    Description:
1040    
1041    1.  Yet another fix for x86 assembly for idivl, imull, mull and friends.
1042    
1043    2.  Miscellaneous improvements to MLRISC (unused in sml/nj)
1044    
1045    ----------------------------------------------------------------------
1046    Name: Stefan
1047    Date: 2000/04/07 10:00:00 EDT
1048    Tag: monnier-20000406-branch-handling
1049    Description:
1050    
1051    Improved handling of branches (mostly those generated from
1052    polymorphic equality), removed switchoff and changed the
1053    default optimization settings (more cpsopt and less flintopt).
1054    
1055    ----------------------------------------------------------------------
1056    Name: Allen Leung
1057  Date: 2000/04/06 01:30:00 EST  Date: 2000/04/06 01:30:00 EST
1058  Tag: leunga-20000406-peephole-x86-SSA-2  Tag: leunga-20000406-peephole-x86-SSA-2
1059  Description:  Description:
# Line 87  Line 1128 
1128    
1129  3.  Assembly  3.  Assembly
1130    
1131      When generating assemby, resolve the value of client defined constants,      When generating assembly, resolve the value of client defined constants,
1132      instead of generating symbolic values.  This is controlled by the      instead of generating symbolic values.  This is controlled by the
1133      new flag "asm-resolve-constants", which is default to true.      new flag "asm-resolve-constants", which is default to true.
1134    
# Line 110  Line 1151 
1151    
1152  To this end, I arranged that instead of "structure Core" as "structure  To this end, I arranged that instead of "structure Core" as "structure
1153  _Core" is bound in the pervasive environment.  Core access is done via  _Core" is bound in the pervasive environment.  Core access is done via
1154  _Core (which can never be accidentially rebound because _Core is not a  _Core (which can never be accidentally rebound because _Core is not a
1155  legal surface-syntax symbol).  legal surface-syntax symbol).
1156    
1157  The current solution is much cleaner because the core environment is  The current solution is much cleaner because the core environment is
# Line 120  Line 1161 
1161  with dynamic and symbolic parts of the core environment.  with dynamic and symbolic parts of the core environment.
1162    
1163  Remaining hackery (to bind the "magic" symbol _Core) is localized in the  Remaining hackery (to bind the "magic" symbol _Core) is localized in the
1164  compilation mananger's bootstrap compiler (actually: in the "init group"  compilation manager's bootstrap compiler (actually: in the "init group"
1165  handling).  See the comments in src/system/smlnj/init/init.cmi for  handling).  See the comments in src/system/smlnj/init/init.cmi for
1166  more details.  more details.
1167    
# Line 235  Line 1276 
1276     (specified in the .cm file at each instance where the tool's class is     (specified in the .cm file at each instance where the tool's class is
1277     used).     used).
1278    
1279     This was done to accomodate the new "make" and "shell" tools which     This was done to accommodate the new "make" and "shell" tools which
1280     facilitate fairly seemless hookup to portions of code managed using     facilitate fairly seamless hookup to portions of code managed using
1281     Makefiles or Shell scripts.     Makefiles or Shell scripts.
1282    
1283     There are no classes "shared" or "private" anymore.  Instead, the     There are no classes "shared" or "private" anymore.  Instead, the
# Line 248  Line 1289 
1289    
1290     All existing tools are described in the CM manual.     All existing tools are described in the CM manual.
1291    
1292     - Slightly better error handling.  (CM now surpresses many followup     - Slightly better error handling.  (CM now suppresses many followup
1293     error messages that tended to be more annoying than helpful.)     error messages that tended to be more annoying than helpful.)
1294    
1295  2. Major changes to the compiler's static environment data structures.  2. Major changes to the compiler's static environment data structures.
# Line 382  Line 1423 
1423    
1424       I've changed andl to testl in the floating point test sequence       I've changed andl to testl in the floating point test sequence
1425       whenever appropriate.  The Intel optimization guide states that       whenever appropriate.  The Intel optimization guide states that
1426       testl is perferable to andl.       testl is preferable to andl.
1427    
1428  7. RA (x86 only)  7. RA (x86 only)
1429    
# Line 564  Line 1605 
1605    
1606  1. Tools.registerStdShellCmdTool (from smlnj/cm/tool.cm) takes an  1. Tools.registerStdShellCmdTool (from smlnj/cm/tool.cm) takes an
1607  additional argument called "template" which is an optional string that  additional argument called "template" which is an optional string that
1608  specifiel the layout of the tool command line.  See the CM manual for  specifies the layout of the tool command line.  See the CM manual for
1609  explanation.  explanation.
1610    
1611  2. A special-purpose tool can be "regisitered" by simply dropping the  2. A special-purpose tool can be "registered" by simply dropping the
1612  corresponding <...>-tool.cm (and/or <...>-ext.cm) into the same  corresponding <...>-tool.cm (and/or <...>-ext.cm) into the same
1613  directory where the .cm file lives that uses this tool.  (The  directory where the .cm file lives that uses this tool.  (The
1614  behavior/misfeature until now was to look for the tool description  behavior/misfeature until now was to look for the tool description
# Line 611  Line 1652 
1652  rebuild.  Having sets of the form <base><k>.{bin,boot}.<arch>-unix for  rebuild.  Having sets of the form <base><k>.{bin,boot}.<arch>-unix for
1653  <k>=1,2,... is normally not a good idea when invoking fixpt.  However,  <k>=1,2,... is normally not a good idea when invoking fixpt.  However,
1654  they might be the result of an earlier partial run of fixpt (which  they might be the result of an earlier partial run of fixpt (which
1655  perhaps got accidentially killed).  In this case, fixpt will quickly  perhaps got accidentally killed).  In this case, fixpt will quickly
1656  move through what exists before continuing where it left off earlier,  move through what exists before continuing where it left off earlier,
1657  and, thus, saves a lot of time.  and, thus, saves a lot of time.
1658    
# Line 661  Line 1702 
1702    it from that remote directory.    it from that remote directory.
1703    This should simplify installation further:  For machines that have    This should simplify installation further:  For machines that have
1704    access to the internet, just fetch <version>-config.tgz, unpack it,    access to the internet, just fetch <version>-config.tgz, unpack it,
1705    edit config/targets, and go (run config/install.sh).  The scipt will    edit config/targets, and go (run config/install.sh).  The script will
1706    fetch everything else that it might need all by itself.    fetch everything else that it might need all by itself.
1707    
1708    For CVS users, this mechanism is not relevant for source archives, but    For CVS users, this mechanism is not relevant for source archives, but

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