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revision 624, Fri Apr 21 03:06:21 2000 UTC revision 676, Sat Jun 24 03:37:03 2000 UTC
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12  Tag: <post-commit CVS tag>  Tag: <post-commit CVS tag>
13  Description:  Description:
14  ----------------------------------------------------------------------  ----------------------------------------------------------------------
15    Name: Matthias Blume
16    Date: 2000/06/24 12:40:00 JST
17    Tag: blume-20000624-startup
18    Description:
19    
20    Fixes startup slowdown problem.  (I was calling SrcPath.sync a _tad_
21    bit too often -- to put it mildly. :)
22    
23    ----------------------------------------------------------------------
24    Name: Matthias Blume
25    Date: 2000/06/23 18:20:00 JST
26    Tag: blume-20000623-btrace
27    Description:
28    
29    This updates adds a backtrace facility to aid programmers in debugging
30    their programs.  This involves the following changes:
31    
32    1. Module system/smlnj/init/core.sml (structure _Core) now has hooks for
33       keeping track of the current call stack.  When programs are compiled
34       in a special mode, the compiler will insert calls to these hooks
35       into the user program.
36       "Hook" means that it is possible for different implementations of
37       back-tracing to register themselves (at different times).
38    
39    2. compiler/MiscUtil/profile/btrace.sml implements the annotation phase
40       as an Absyn.dec->Absyn.dec rewrite.  Normally this phase is turned off.
41       It can be turned on using this call:
42         SMLofNJ.Internals.BTrace.mode (SOME true);
43       Turning it off again:
44         SMLofNJ.Internals.BTrace.mode (SOME false);
45       Querying the current status:
46         SMLofNJ.Internals.BTrace.mode NONE;
47       Annotated programs are about twice as big as normal ones, and they
48       run a factor of 2 to 4 slower with a dummy back-trace plugin (one
49       where all hooks do nothing).  The slowdown with a plugin that is
50       actually useful (such as the one supplied by default) is even greater,
51       but in the case of the default plugin it is still only an constant
52       factor (amortized).
53    
54    3. system/Basis/Implementation/NJ/internals.{sig,sml} have been augmented
55       with a sub-structure BTrace for controlling back-tracing.  In particular,
56       the above-mentioned function "mode" controls whether the annotation
57       phase is invoked by the compiler.  Another important function is
58       "trigger": when called it aborts the current execution and causes
59       the top-level loop to print a full back-trace.
60    
61    4. compiler/MiscUtil/profile/btimp.sml is the current default plugin
62       for back-tracing.  It keeps track of the dynamic call stack and in
63       addition to that it keeps a partial history at each "level" of that
64       stack.  For example, if a tail-calls b, b tail-calls c, and c tail-calls
65       d and b (at separate times, dynamically), then the report will show:
66    
67       GOTO   d
68             /c
69       GOTO  \b
70       CALL   a
71    
72       This shows that there was an initial non-tail call of a, then a
73       tail-call to b or c, looping behavior in a cluster of functions that
74       consist of b and c, and then a goto from that cluster (i.e., either from
75       b or from c) to d.
76    
77       Note that (depending on the user program) the amount of information
78       that the back-trace module has to keep track of at each level is bounded
79       by a constant.  Thus, the whole implementation has the same asymptotical
80       complexity as the original program (both in space and in time).
81    
82    5. compiler/TopLevel/interact/evalloop.sml has been modified to
83       handle the special exception SMLofNJ.Internals.BTrace.BTrace
84       which is raised by the "trigger" function mentioned above.
85    
86    Notes on usage:
87    
88    - Annotated code works well together with unannotated code:
89    Unannotated calls simply do not show up at all in the backtrace.
90    
91    - It is not a good idea to let modules that were annotated during
92    different sessions run at the same time.  This is because the compiler
93    chooses small integers to identify individual functions, and there
94    will be clashes if different modules were compiled in separate sessions.
95    (Nothing will crash, and you will even be told about the clashes, but
96    back-trace information will in general not be useful.)
97    
98    - Back-tracing can be confused by callcc and capture.
99    
100    - The only way of getting a back-trace right now is to explicitly
101    invoke the "trigger" function from your user program.  Eventually, we
102    should make every exception carry back-trace information (if
103    available).  But since this creates more overhead at "raise"-time
104    (similar to the current exnHistory overhead), I have not yet
105    implemented this.  (The implementation will be rather easy.)  With
106    exceptions carrying back-trace information, this facility will be even
107    more useful because users don't need to modify their programs...
108    
109    - While it is possible to compile the compiler with back-trace
110    annotations turned on (I did it to get some confidence in
111    correctness), you must make absolutely sure that core.sml and
112    btimp.sml are compiled WITHOUT annotation!  (core.sml cannot actually
113    be compiled with annotation because there is no core access yet, but
114    if you compile btimp.sml with annotation, then the system will go into
115    an infinite recursion and crash.)
116    Since CM currently does not know about BTrace, the only way to turn
117    annotations on and off for different modules of the compiler is to
118    interrupt CMB.make, change the settings, and re-invoke it.  Of course,
119    this is awkward and clumsy.
120    
121    Sample sessions:
122    
123    Standard ML of New Jersey v110.28.1 [FLINT v1.5], June 5, 2000
124    - SMLofNJ.Internals.BTrace.mode (SOME true);
125    [autoloading]
126    [autoloading done]
127    val it = false : bool
128    - structure X = struct
129    -     fun main n = let
130    -         fun a (x, 0) = d x
131    -           | a (x, n) = b (x, n - 1)
132    -         and b (x, n) = c (x, n)
133    -         and c (x, n) = a (x, n)
134    -         and d x = e (x, 3)
135    -         and e (x, 0) = f x
136    -           | e (x, n) = e (x, n - 1)
137    -         and f 0 = SMLofNJ.Internals.BTrace.trigger ()
138    -           | f n = n * g (n - 1)
139    -         and g n = a (n, 3)
140    -     in
141    -         f n
142    -     end
143    - end;
144    structure X : sig val main : int -> int end
145    - X.main 3;
146    *** BACK-TRACE ***
147    GOTO   stdIn:4.2-13.20: X.main[2].f
148    GOTO-( stdIn:4.2-13.20: X.main[2].e
149    GOTO   stdIn:4.2-13.20: X.main[2].d
150         / stdIn:4.2-13.20: X.main[2].a
151         | stdIn:4.2-13.20: X.main[2].b
152    GOTO-\ stdIn:4.2-13.20: X.main[2].c
153    CALL   stdIn:4.2-13.20: X.main[2].g
154    GOTO   stdIn:4.2-13.20: X.main[2].f
155    GOTO-( stdIn:4.2-13.20: X.main[2].e
156    GOTO   stdIn:4.2-13.20: X.main[2].d
157         / stdIn:4.2-13.20: X.main[2].a
158         | stdIn:4.2-13.20: X.main[2].b
159    GOTO-\ stdIn:4.2-13.20: X.main[2].c
160    CALL   stdIn:4.2-13.20: X.main[2].g
161    GOTO   stdIn:4.2-13.20: X.main[2].f
162    GOTO-( stdIn:4.2-13.20: X.main[2].e
163    GOTO   stdIn:4.2-13.20: X.main[2].d
164         / stdIn:4.2-13.20: X.main[2].a
165         | stdIn:4.2-13.20: X.main[2].b
166    GOTO-\ stdIn:4.2-13.20: X.main[2].c
167    CALL   stdIn:4.2-13.20: X.main[2].g
168    GOTO   stdIn:4.2-13.20: X.main[2].f
169    CALL   stdIn:2.15-17.4: X.main[2]
170    -
171    
172    (Note that because of a FLINt bug the above code currently does not
173    compile without BTrace turned on.)
174    
175    Here is another example, using my modified Tiger compiler:
176    
177    Standard ML of New Jersey v110.28.1 [FLINT v1.5], June 5, 2000
178    - SMLofNJ.Internals.BTrace.mode (SOME true);
179    [autoloading]
180    [autoloading done]
181    val it = false : bool
182    - CM.make "sources.cm";
183    [autoloading]
184    ...
185    [autoloading done]
186    [scanning sources.cm]
187    [parsing (sources.cm):parse.sml]
188    [creating directory CM/SKEL ...]
189    [parsing (sources.cm):tiger.lex.sml]
190    ...
191    [wrote CM/sparc-unix/semant.sml]
192    [compiling (sources.cm):main.sml]
193    [wrote CM/sparc-unix/main.sml]
194    [New bindings added.]
195    val it = true : bool
196    - Main.compile ("../testcases/merge.tig", "foo.out");
197    *** BACK-TRACE ***
198    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trvar
199    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
200    CALL   lib/semant.sml:289.3-295.22: SemantFun[2].transExp.trexp.check[2]
201    GOTO   lib/semant.sml:289.3-295.22: SemantFun[2].transExp.trexp.check[2]
202    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
203    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
204    CALL   lib/semant.sml:488.3-505.6: SemantFun[2].transDec.trdec[2].transBody[2]
205         / lib/semant.sml:411.65-543.8: SemantFun[2].transDec
206    CALL-\ lib/semant.sml:413.2-540.9: SemantFun[2].transDec.trdec[2]
207    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
208    CALL   lib/semant.sml:8.52-558.4: SemantFun[2].transProg[2]
209    CALL   main.sml:1.18-118.4: Main.compile[2]
210    -
211    
212    ----------------------------------------------------------------------
213    Name: Matthias Blumen
214    Date: 2000/06/21 18:00:00 JST
215    Tag: blume-20000621-manual
216    Description:
217    
218    CM manual update: Path environments documented.
219    
220    ----------------------------------------------------------------------
221    Name: Matthias Blume
222    Date: 2000/06/19 13:40:00
223    Tag: blume-20000619-manual
224    Description:
225    
226    CM manual and system/README update.  This only covers the fact that
227    there are no more implicit anchors.  (Path environments and the "bind"
228    option to "cm" have yet to be documented.)
229    
230    ----------------------------------------------------------------------
231    Name: Matthias Blume
232    Date: 2000/06/19 11:05:00 JST
233    Tag: blume-20000619-chdir-bugfix
234    Description:
235    
236    Fixed a bug in new SrcPath module that sometimes led to a bad chDir call.
237    
238    ----------------------------------------------------------------------
239    Name: Matthias Blume
240    Date: 2000/06/18 22:00:10 JST
241    Tag: blume-20000618-implicit-anchors-really-gone
242    Description:
243    
244    I updates the previous HISTORY entry where I forgot to mention that
245    implicit anchors are no longer with us.
246    
247    The current update also gets rid of the (now useless) controller
248    CM.Control.implicit_anchors.
249    
250    ----------------------------------------------------------------------
251    Name: Matthias Blume
252    Date: 2000/06/16 17:30:00 JST
253    Tag: blume-20000616-anchorenv
254    Description:
255    
256    This patch implements the long anticipated (just kidding :) "anchor
257    environment" mechanism.  In the course of doing this, I also
258    re-implemented CM's internal "SrcPath" module from scratch.  The new
259    one should be more robust in certain boundary cases.  In any case, it
260    is a lot cleaner than its predecessor (IMHO).
261    
262    This time, although there is yet another boot file format change, I
263    kept the unpickler backward-compatible.  As a result, no new bootfiles
264    are necessary and bootstrapping is straightforward.  (You cannot read
265    new bootfiles into an old system, but the other way around is no
266    problem.)
267    
268    Visible changes:
269    
270    ** 0. Implicit path anchors (without the leading $-symbol) are no
271    longer recognized at all. This means that such path names are not
272    illegal either.  For example, the name basis.cm simply refers to a
273    local file called "basis.cm" (i.e, the name is an ordinary path
274    relative to .cm-files directory).  Or, to put it differently, only
275    names that start with $ are anchored paths.
276    
277    ** 1. The $<singlearc> abbreviation for $/<singlearc> has finally
278    vanished.
279    
280    John (Reppy) had critizised this as soon as I originally proposed and
281    implemented it, but at that time I did not really deeply believe
282    him. :) Now I came full-circle because I need the $<singlearc> syntax
283    in another place where it cannot be seen as an abbreviation for
284    $/<singlearc>.  To avoid the confusion, $<singlearc> now means what it
285    seems to mean (i.e., it "expands" into the corresponding anchor
286    value).
287    
288    However, when paths are used as members in CM description files, it
289    continues to be true that there must be at least another arc after the
290    anchor.  This is now enforced separately during semantic analysis
291    (i.e., from a lexical/syntactical point of view, the notation is ok.)
292    
293    ** 2. The "cm" class now accepts an option "bind".  The option's value
294    is a sub-option list of precisely two items -- one labeled "anchor"
295    and the other one labeled "value".  As you might expect, "anchor" is
296    used to specify an anchor name to be bound, and "value" specifies what
297    the anchor is being bound to.
298    
299    The value must be a directory name and can be given in either standard
300    syntax (including the possibility that it is itself an anchored path)
301    or native syntax.
302    
303    Examples:
304    
305       foo.cm (bind:(anchor:bar value:$mystuff/bar))
306       lib.cm (bind:(anchor:a value:"H:\\x\\y\\z"))  (* only works under windows *)
307    
308    and so on.
309    
310    The meaning of this is that the .cm-file will be processed with an
311    augmented anchor environment where the given anchor(s) is/are bound to
312    the given values(s).
313    
314    The rationale for having this feature is this: Suppose you are trying
315    to use two different (already stable) libraries a.cm and b.cm (that
316    you perhaps didn't write yourself).  Further, suppose each of these
317    two libraries internally uses its own auxiliary library $aux/lib.cm.
318    Normally you would now have a problem because the anchor "lib" can not
319    be bound to more than one value globally.  Therefore, the project that
320    uses both a.cm and b.cm must locally redirect the anchor to some other
321    place:
322    
323       a.cm (bind:(anchor:lib value:/usr/lib/smlnj/a-stuff))
324       b.cm (bind:(anchor:lib value:/usr/lib/smlnj/b-stuff))
325    
326    This hard-wires $lib/aux.cm to /usr/lib/smlnj/a-stuff/aux.cm or
327    /usr/lib/smlnj/b-stuff/aux.cm, respectively.
328    
329    Hard-wiring path names is a bit inflexible (and CM will verbosely warn
330    you when you do so at the time of CM.stabilize).  Therefore, you can
331    also use an anchored path as the value:
332    
333      a.cm (bind:(anchor:lib value:$a-lib))
334      b.cm (bind:(anchor:lib value:$b-lib))
335    
336    Now you can globally configure (using the usual CM.Anchor.anchor or
337    pathconfig machinery) bindings for "a-lib" and "b-lib".  Since "lib"
338    itself is always locally bound, setting it globally is no longer
339    meaningful or necessary (but it does not hurt either).  In fact, "lib"
340    can still be used as a global anchor for separate purposes.  As a
341    matter of fact, one can locally define "lib" in terms of a global
342    "lib":
343    
344      a.cm (bind:(anchor:lib value:$lib/a))
345      b.cm (bind:(anchor:lib value:$lib/b))
346    
347    ** 3: The encoding of path names has changed.  This affects the way
348    path names are shown in CM's progress report and also the internal
349    protocol encoding used for parallel make.
350    
351    The encoding now uses one or more ':'-separated segments.  Each
352    segments corresponds to a file that has been specified relative to the
353    file given by its preceding segment.  The first segment is either
354    relative to the CWD, absolute, or anchored.  Each segment itself is
355    basically a Unix pathname; all segments but the first are relative.
356    
357    Example:
358    
359       $foo/bar/baz.cm:a/b/c.sml
360    
361    This path denotes the file bar/a/b/c.sml relative to the directory
362    denoted by anchor "foo".  Notice that the encoding also includes
363    baz.cm which is the .cm-file that listed a/b/c.sml.  As usual, such
364    paths are resolved relative to the .cm-files directory, so baz.cm must
365    be ignored to get the "real" pathname.
366    
367    To make this fact more obvious, CM puts the names of such "virtual
368    arcs" into parentheses when they appear in progress reports. (No
369    parentheses will appear in the internal protocol encoding.)  Thus,
370    what you really see is:
371    
372      $foo/bar/(baz.cm):a/b/c.sml
373    
374    I find this notation to be much more informative than before.
375    
376    Another new feature of the encoding is that special characters
377    including parentheses, colons, (back)slashes, and white space are
378    written as \ddd (where ddd is the decimal encoding of the character).
379    
380    *** The CM manual still needs to be updated.
381    
382    ----------------------------------------------------------------------
383    Name: Allen Leung
384    Date: 2000/06/15 00:38:00
385    Tag: leunga-20000615-x86-peephole
386    
387    x86 Peephole fix by Fermin.  Affects c-- and moby only.
388    
389    ----------------------------------------------------------------------
390    Name: Matthias Blume
391    Date: 2000/06/12 11:40:00
392    Tag: blume-20000612-parmakefix
393    Description:
394    
395    More cleanup after changing the file naming scheme: This time I
396    repaired the parallel make mechanism for CMB.make which I broke earlier.
397    
398    ----------------------------------------------------------------------
399    Name: Allen Leung
400    Date: 2000/06/09 01:25:00
401    Tag: leunga-20000609-various
402    
403    None of these things should affect normal SML/NJ operations
404    
405    1. Peephole improvements provided by Fermin (c--)
406    2. New annotation DEFUSE for adding extra dependence (moby)
407    3. New X86 LOCK instructions (moby)
408    4. New machine description language for reservation tables (scheduling)
409    5. Fixes to various optimization/analysis modules (branch chaining, dominator
410       trees etc.)
411    6. I've changed the CM files so that they can work with versions
412       110.0.6, 110.25 and 110.28
413    
414    ----------------------------------------------------------------------
415    Name: Matthias Blume
416    Date: 2000/06/09 12:40:00
417    Tag: blume-20000609-log
418    Description:
419    
420    - Removed all(?) remaining RCS Log entries from sources.
421    
422    - Fixed bug in ml-yacc and ml-lex sources (use explicit anchors for
423      anchored paths).
424    
425    ----------------------------------------------------------------------
426    Name: Matthias Blume
427    Date: 2000/06/07 17:00:00 JST
428    Tag: blume-20000607-no-implicit-anchors
429    Description:
430    
431    1. This update changes the default setting for
432    CM.Control.implicit_anchors from true to false.  This means that
433    implicit anchors are no longer permitted by default.  I also tried to
434    make sure that nothing else still relies on implicit anchors.
435    (This is the next step on the schedule towards a CM that does not even
436    have the notion of implicit anchors anymore.)
437    
438    2. More CM manual updates.
439    
440    3. I managed to track down and fix the pickling bug I mentioned last
441    time.  Because of the previously existing workaround, this entails no
442    immediate practical changes.
443    
444    ----------------------------------------------------------------------
445    Name: Matthias Blume
446    Date: 2000/06/06 11:15:00 JST
447    Tag: blume-20000606-lazierpickle
448    Description:
449    
450    !!!! NEW BOOT FILES !!!!
451    
452    * The main purpose of this update is to make library pickles lazier in
453    order to reduce the initial space penalty for autoloading a library.
454    As a result, it is now possible to have $smlnj/compiler.cm
455    pre-registered.  This should take care of the many complaints or
456    inquiries about missing structure Compiler.  This required changes to
457    CM's internal data structures and small tweaks to some algorithms.
458    
459    As a neat additional effect, it is no longer necessary (for the sake
460    of lean heap image files) to distinguish between a "minimal" CM and a
461    "full" CM.  Now, there is only one CM (i.e., the "full" version:
462    $smlnj/cm.cm aka $smlnj/cm/full.cm), and it is always available at the
463    interactive top level. ($smlnj/cm/minimal.cm is gone.)
464    
465    To make the life of compiler-hackers easier, "makeml" now also
466    pre-registers $smlnj/cmb.cm (aka $smlnj/cmb/current.cm).  In other
467    words, after you bootstrap a new sml for the first time, you will not
468    have to autoload $smlnj/cmb.cm again afterwards.  (The first time
469    around you will still have to do it, though.)
470    
471    * A second change consists of major updates to the CM manual.  There
472    are now several appendices with summary information and also a full
473    specification of the CM description file syntax.
474    
475    * In directory src/system I added the script "allcross".  This script
476    invokes sml and cross-compiles the compiler for all supported
477    architectures.  (Useful when providing a new set of boot files.)
478    
479    * There seems to be a latent bug in my "lazy pickles" mechanism.  I
480    added a small tweak to pickle-util.sml to work around this problem,
481    but it is not a proper fix yet.  I will investigate further.  (The
482    effect of the bug was an inflation of library pickle size.)
483    
484    * Version number increased to 110.28.1 (to avoid compatibility problems).
485    
486    ----------------------------------------------------------------------
487    Name: Allen Leung
488    Date: 2000/05/25 17:28 EDT
489    Tag: leunga-20000525-ra
490    Description:
491    
492      Fixed a bug in freezing phase of the register allocator.
493    
494    ----------------------------------------------------------------------
495    Name: Allen Leung
496    Date: 2000/05/15 22:53 EDT
497    Tag: leunga-20000515-alpha-x86-ra
498    Description:
499    
500      1. Alpha
501    
502          Slight cleanup.  Removed the instruction SGNXL
503    
504      2. X86
505    
506          Added the following instructions to the instruction set:
507    
508            ROLx, RORx,
509            BTx, BTSx, BTLx, BTRx,
510            XCHGx, and variants with the LOCK prefix
511    
512      3. Register Allocation
513    
514          The module ra-rewrite-with-renaming has been improved.
515    
516      These have no effect on SML/NJ.
517    
518    ----------------------------------------------------------------------
519    Name: Matthias Blume
520    Date: 2000/05/15 16:20:00 JST
521    Tag: blume-20000515-lightrebuild
522    Description:
523    
524    1. I added an alternative to "-rebuild" to "makeml".  The difference is
525       that prior to calling CMB.make' the CM-variable "LIGHT" will be
526       defined.  In effect, the command will not build any cross-compiler
527       backends and therefore finish more quickly.
528    
529       The "fixpt" script also takes a "-light" switch to be able to use
530       this new facility while compiling for a fixpoint.
531    
532    2. I replaced all mentions of anchored paths in group owner specifications
533       with simple relative paths (usually starting with "..").
534       The rationale is that a library's internal workings should not be
535       compromised by the lack of some anchor.  (An anchor is necessary
536       for someone who wants to refer to the library by an anchored path,
537       but it should not be necessary to build the same library in the first
538       place.)
539    
540    3. I changed the way CM's tool mechanism determines the shell command
541       string used for things like ml-yacc etc. so that it does not break
542       when CM.Control.implicit_anchors is turned off.
543    
544    ----------------------------------------------------------------------
545    Name: Matthias Blume
546    Date: 2000/05/12 18:20:00 JST
547    Tag: blume-20000512-ml-build
548    Description:
549    
550    Fixed a bug in config/_ml-build that prevented ml-yacc and ml-lex from
551    getting installed properly (by config/install.sh).
552    
553    ----------------------------------------------------------------------
554    Name: Matthias Blume
555    Date: 2000/05/12 17:30:00 JST
556    Tag: blume-20000512-anchors
557    Description:
558    
559    !!! NEW BOOT FILES !!!
560    
561    This change is in preparation of fading out support for "implicitly
562    anchored path names".  I went through all sources and used the
563    explicit (and relatively new) $-notation.  See system/README and the
564    CM manual for more info on this.
565    
566    I also modified the anchoring scheme for some things such as "smlnj",
567    "MLRISC", "cm", etc. to take advantage of the fact that explicit
568    anchors are more expressive: anchor name and first arc do not have to
569    coincide.  This entails the following user-visible change:
570    
571    You have to write $smlnj/foo/bar instead of smlnj/foo/bar.  In
572    particular, when you fire up sml with a command-line argument, say,
573    e.g.:
574    
575       sml '$smlnj/cmb.cm'
576    
577    At the ML toplevel prompt:
578    
579       CM.autoload "$smlnj/cmb.cm";
580    
581    There is also a new controller in CM.Control that can be used to turn
582    off all remaining support for implicit anchors by saying:
583    
584        CM.autoload "$smlnj/
585        #set CM.Control.implicit_anchors false;
586    
587    This causes CM to reject implicitly anchored paths.  This is (for the
588    time being) less permissive than the "final" version where there will
589    be no more such implicit anchors and relative paths will be just that:
590    relative.
591    
592    The next step (version after next version?) will be to make the
593    default for CM.Control.implicit_anchors false.  After the dust has
594    settled, I can then produce the "final" version of this...
595    
596    Note: Since bootstrapping is a bit tricky, I provided new boot files.
597    
598    ----------------------------------------------------------------------
599    Name: Matthias Blume
600    Date: 2000/05/11 16:30:00 JST
601    Tag: blume-20000511-sources
602    Description:
603    
604    The main change is that I added function CM.sources as a generalized
605    version of the earlier CM.makedepend.  This entails the following
606    additional changes:
607    
608      - CM.makedepend has been dropped.
609    
610      - CM manual has been updated.
611    
612      - TOOLS signature and API have been changed.
613    
614    ----------------------------------------------------------------------
615    Name: Allen Leung
616    Date: 2000/05/10 21:17 EDT
617    Tag: leunga-20000510-moby-c--ssa
618    Description:
619    
620      Various bug fixes and new features for C--, Moby and MLRISC optimizations.
621    None of these affect SML/NJ.
622    
623    1. Register Allocation
624    
625        a. A new ra spilling module (ra/ra-spill-with-renaming) is implemented.
626           This module tries to remove local (i.e. basic block level) redundancies
627           during spilling.
628    
629        b. A new framework for performing region based register allocation.
630           Not yet entirely functional.
631    
632    2. X86
633    
634       a. DefUse for POP was missing the stack pointer [found by Lal]
635       b. Reload for CALL was incorrect in X86Spill [found by John]
636       c. Various fixes in X86Spill so that it can be used correctly for
637          the new spilling module.
638    
639    3. SSA/IR
640    
641       a. New module ir/dj-dataflow.sml implements elimination based
642          data flow analysis.
643    
644    4. MLRiscGen
645    
646       a. Fix for gc type annotation
647    
648    5. MDGen
649    
650       Various fixes for machine description -> ml code translation.  For ssa
651       only.
652    
653    ----------------------------------------------------------------------
654    Name: Allen Leung
655    Date: 2000/05/08 22:17 EDT
656    Tag: leunga-20000508-labexp
657    Description:
658    
659      Fermin has found a few assembly problems with constant expressions
660      generated in LabelExp.  Mostly, the problems involve extra parentheses,
661      which choke on dumb assemblers.  This is his fix.
662    
663    ----------------------------------------------------------------------
664    Name: Dave MacQueen
665    Date: 2000/04/09 14:00 EDT
666    Tag: dbm-20000502-Version_110_28
667    Description:
668    
669    1. Updated src/compiler/TopLevel/main/version.sml to version 110.28
670    
671    2. Updated config/version to 110.28
672    
673    3. Updated config/srcarchiveurl
674    
675    3. New boot files!
676       ftp://ftp.research.bell-labs.com/dist/smlnj/working/110.28/
677    
678    ----------------------------------------------------------------------
679    Name: Matthias Blume
680    Date: 2000/05/01 19:05:00 JST
681    Tag: blume-20000501-noweb
682    Description:
683    
684    A new noweb tool has been added.  The existing system is entirely
685    unaffected by this, but some CM users have asked for renewed noweb
686    support.  Everything is documented in the CM manual.
687    
688    New (plugin) libraries:
689    
690       noweb-tool.cm
691       nw-ext.cm
692    
693    ----------------------------------------------------------------------
694    Name: Dave MacQueen
695    Date: 2000/04/30 12:40PM EDT
696    Tag: dbm-20000430-bug_fixes
697    Description:
698    
699    1. Fix for bug 1498
700       smlnj/src/system/Basis/Implementation/Unsafe/object.sig
701       smlnj/src/system/Basis/Implementation/Unsafe/object.sml
702         added toRealArray function
703       smlnj/src/compiler/MiscUtil/print/ppobj.sml
704         added check for tag Obj.RealArray to array printing case in ppObj
705    
706    2. Fix for bug 1510
707       smlnj/src/compiler/Semant/types/typesutil.sml
708         fixed definition of dummyargs (used by equalTycon) so that
709         dummy args are distinct types
710    
711    ----------------------------------------------------------------------
712    Name: Matthias Blume
713    Date: 2000/04/30 01:00:00 JST
714    Tag: blume-20000430-versions
715    Description:
716    
717    1. CM version numbering added.  This is an implementation of Lal's
718       proposal for adding version numbers and version checking to .cm
719       files.  Lal said that his proposal was just that -- a proposal.
720       For the time being I went ahead and implemented it so that people
721       can comment on it.  Everything is completely backward-compatible
722       (except for the stable library format, i.e., new bootfiles!).
723    
724       As usual, see the CM manual for details.
725    
726    2. An alternative syntax for anchored paths has been implemented.
727       Dave has recently voiced the same concerns that I had when I did
728       this, so there should be some support.  My take is that eventually
729       I will let support for the current syntax (where anchors are
730       "implicit") fade out in favor of the new, explicit syntax.
731       In order to be backward-compatible, both old and new syntax are
732       currently supported.
733    
734       Again, see the CM manual for details.
735    
736    3. Parallel make is trying to be slightly smarter:  When the master
737       process finds a "bottleneck", i.e., when there is only one
738       compilation unit that can be compiled and everybody else is
739       waiting on it, then it will simply compile it directly instead
740       of clumsily telling one of the slaves to do it.
741    
742    4. Support for "unsharing" added.  This is necessary in order to be
743       able to have two different versions of the same library running
744       at the same time (e.g., for trying out a new MLRISC while still
745       having the old MLRISC linked into the current compiler, etc.)
746       See the CM manual.
747    
748    5. Simple "makedepend" functionality added for generating Makefile
749       dependency information.  (This is rather crude at the moment.
750       Expect some changes here in the future.)
751    
752    6. ".fun" added as a recognized suffix for ML files. Also documented
753       explicitly in the manual that the fallback behavior (unknown suffix
754       -> ML file) is not an official feature!
755    
756    7. Small changes to the pickler for stable libraries.
757    
758    8. Several internal changes to CM (for cleanup/improvement).
759    
760    
761    !!!! NEW BINFILES !!!!
762    
763    ----------------------------------------------------------------------
764    Name: Matthias Blume
765    Date: 2000/04/28 17:30:00 JST
766    Tag: blume-20000428-pathconfig
767    Description:
768    
769    1. I changed config/install.sh to remove duplicate entries from the
770       lib/pathconfig file at the end.  Moreover, the final version of
771       lib/pathconfig is sorted alphabetically.  The same (sorting) is done
772       in src/system/installml.
773    
774    2. The config/install.sh script now consistently uses relative
775       pathnames in lib/pathconfig whenever the anchor is in the lib
776       directory.  (So far this was true for the libraries that come
777       pre-compiled and bundled as part of the bootfiles but not for
778       libraries that are compiled by the script itself.)
779    
780    ----------------------------------------------------------------------
781    Name: Matthias Blume
782    Date: 2000/04/26 13:10:00 JST
783    Tag: blume-20000426-fun_suffix
784    Description:
785    
786    Added ".fun" as a recognized file name suffix (for ML code).
787    
788    ----------------------------------------------------------------------
789    Name: Allen Leung
790    Date: 2000/04/25 17:00:00 EST
791    Tag: leunga-20000425-alpha-ra
792    Description:
793    
794    1. Alpha
795    
796        PSEUDOARITH was missing in AlphaRewrite.  This causes an endless loop
797    in C--.
798    
799    2. RA
800    
801       Added a flag "ra-dump-size" to print out the size of the flowgraph
802       and the interference graph.
803    
804    ----------------------------------------------------------------------
805    Name: Dave MacQueen
806    Date: 2000/04/25/
807    Tag: dbm-20000425-mlyacc_doc_examples
808    Description:
809      Updated mlyacc.tex sections 5 and 7 for SML '97 and CM.
810      Updated all three examples in src/ml-yacc/examples to run
811      under 110.* using CM.make.
812    
813    ----------------------------------------------------------------------
814  Name: Allen Leung  Name: Allen Leung
815  Date: 2000/04/20 23:04:00 EST  Date: 2000/04/20 23:04:00 EST
816  Tag: leunga-20000420-ssa-c---stuff  Tag: leunga-20000420-ssa-c---stuff
# Line 27  Line 826 
826    
827              s <- t              s <- t
828    
829        no interference edge between s and t are added for this definition of s.        no interference edge between s and t is added for this definition of s.
830    
831     b. I've added two new spill heuristic modules that Fermin and I developed     b. I've added two new spill heuristic modules that Fermin and I developed
832        (in the new library RA.cm). These are unused in SML/NJ but maybe        (in the new library RA.cm). These are unused in SML/NJ but maybe
# Line 175  Line 974 
974    
975  3.  Assembly  3.  Assembly
976    
977      When generating assemby, resolve the value of client defined constants,      When generating assembly, resolve the value of client defined constants,
978      instead of generating symbolic values.  This is controlled by the      instead of generating symbolic values.  This is controlled by the
979      new flag "asm-resolve-constants", which is default to true.      new flag "asm-resolve-constants", which is default to true.
980    
# Line 198  Line 997 
997    
998  To this end, I arranged that instead of "structure Core" as "structure  To this end, I arranged that instead of "structure Core" as "structure
999  _Core" is bound in the pervasive environment.  Core access is done via  _Core" is bound in the pervasive environment.  Core access is done via
1000  _Core (which can never be accidentially rebound because _Core is not a  _Core (which can never be accidentally rebound because _Core is not a
1001  legal surface-syntax symbol).  legal surface-syntax symbol).
1002    
1003  The current solution is much cleaner because the core environment is  The current solution is much cleaner because the core environment is
# Line 208  Line 1007 
1007  with dynamic and symbolic parts of the core environment.  with dynamic and symbolic parts of the core environment.
1008    
1009  Remaining hackery (to bind the "magic" symbol _Core) is localized in the  Remaining hackery (to bind the "magic" symbol _Core) is localized in the
1010  compilation mananger's bootstrap compiler (actually: in the "init group"  compilation manager's bootstrap compiler (actually: in the "init group"
1011  handling).  See the comments in src/system/smlnj/init/init.cmi for  handling).  See the comments in src/system/smlnj/init/init.cmi for
1012  more details.  more details.
1013    
# Line 323  Line 1122 
1122     (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
1123     used).     used).
1124    
1125     This was done to accomodate the new "make" and "shell" tools which     This was done to accommodate the new "make" and "shell" tools which
1126     facilitate fairly seemless hookup to portions of code managed using     facilitate fairly seamless hookup to portions of code managed using
1127     Makefiles or Shell scripts.     Makefiles or Shell scripts.
1128    
1129     There are no classes "shared" or "private" anymore.  Instead, the     There are no classes "shared" or "private" anymore.  Instead, the
# Line 336  Line 1135 
1135    
1136     All existing tools are described in the CM manual.     All existing tools are described in the CM manual.
1137    
1138     - Slightly better error handling.  (CM now surpresses many followup     - Slightly better error handling.  (CM now suppresses many followup
1139     error messages that tended to be more annoying than helpful.)     error messages that tended to be more annoying than helpful.)
1140    
1141  2. Major changes to the compiler's static environment data structures.  2. Major changes to the compiler's static environment data structures.
# Line 470  Line 1269 
1269    
1270       I've changed andl to testl in the floating point test sequence       I've changed andl to testl in the floating point test sequence
1271       whenever appropriate.  The Intel optimization guide states that       whenever appropriate.  The Intel optimization guide states that
1272       testl is perferable to andl.       testl is preferable to andl.
1273    
1274  7. RA (x86 only)  7. RA (x86 only)
1275    
# Line 652  Line 1451 
1451    
1452  1. Tools.registerStdShellCmdTool (from smlnj/cm/tool.cm) takes an  1. Tools.registerStdShellCmdTool (from smlnj/cm/tool.cm) takes an
1453  additional argument called "template" which is an optional string that  additional argument called "template" which is an optional string that
1454  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
1455  explanation.  explanation.
1456    
1457  2. A special-purpose tool can be "regisitered" by simply dropping the  2. A special-purpose tool can be "registered" by simply dropping the
1458  corresponding <...>-tool.cm (and/or <...>-ext.cm) into the same  corresponding <...>-tool.cm (and/or <...>-ext.cm) into the same
1459  directory where the .cm file lives that uses this tool.  (The  directory where the .cm file lives that uses this tool.  (The
1460  behavior/misfeature until now was to look for the tool description  behavior/misfeature until now was to look for the tool description
# Line 699  Line 1498 
1498  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
1499  <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,
1500  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
1501  perhaps got accidentially killed).  In this case, fixpt will quickly  perhaps got accidentally killed).  In this case, fixpt will quickly
1502  move through what exists before continuing where it left off earlier,  move through what exists before continuing where it left off earlier,
1503  and, thus, saves a lot of time.  and, thus, saves a lot of time.
1504    
# Line 749  Line 1548 
1548    it from that remote directory.    it from that remote directory.
1549    This should simplify installation further:  For machines that have    This should simplify installation further:  For machines that have
1550    access to the internet, just fetch <version>-config.tgz, unpack it,    access to the internet, just fetch <version>-config.tgz, unpack it,
1551    edit config/targets, and go (run config/install.sh).  The scipt will    edit config/targets, and go (run config/install.sh).  The script will
1552    fetch everything else that it might need all by itself.    fetch everything else that it might need all by itself.
1553    
1554    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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