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Diff of /sml/trunk/HISTORY

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revision 1145, Fri Mar 15 02:30:53 2002 UTC revision 1653, Fri Oct 15 20:45:02 2004 UTC
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13  Description:  Description:
14    
15  ----------------------------------------------------------------------  ----------------------------------------------------------------------
16    Name: Matthias Blume (blume (at) tti - c (dot) org)
17    Date: 2004/10/15 15:45:00 CDT
18    Tag: blume-20041015-coverage
19    Description:
20    
21    * Test coverage tool added!
22    * Further reorganization of tracing-, debugging-, and profiling support:
23    
24        - moved original BTImp -- now called BackTrace -- into a separate
25          library called $/trace-debug-profile.cm
26        - eliminated all mentions of BTrace from SMLofNJ.Internals
27        - only the instrumentation mechanism is now left in the compiler proper
28        - BackTrace module is a plugin which is NOT plugged in by default
29        - Coverage module is another such plugin
30    
31    To get the benefits of any of these plugin modules, the code in
32    question must be compiled with tdp instrumentation turned on.  This
33    can be done by setting SMLofNJ.Internals.TDP.mode to true.
34    (The ref cell is also controlled via the -Ctdp.instrument=... switch.)
35    
36    Plugins are selected at link time.  (Pre-compiled instrumented code
37    can be re-loaded with different plugins in effect.)  When an
38    instrumented module is linked, whatever plugins are at that time
39    enabled will come into effect for that module.
40    
41    To enable the back-trace plugin, load library $/trace-debug-profile.cm
42    and invoke BackTrace.install() (e.g., from the interactive prompt).
43    To enable the coverage plugin, load the same library and invoke
44    Coverage.install().
45    
46    Back-traces are generated automatically on uncaught exceptions and
47    when the code in question explicitly invokes BackTrace.trigger().
48    
49    Coverage (and execution frequency-) information must be queried
50    explicitly by calling Coverage.not_covered and Coverage.hot_spots.
51    
52    ----------------------------------------------------------------------
53    Name: Matthias Blume (blume (at) tti - c (dot) org)
54    Date: 2004/10/14 17:40:00 CDT
55    Tag: blume-20041014-tdp-core
56    Description:
57    
58    Snapshot of a significant overhaul of how the trace/debug/profile support
59    is hooked into the system (specifically: Core and SMLofNJ.Internals).
60    
61    ----------------------------------------------------------------------
62    Name: Matthias Blume (blume (at) tti - c (dot) org)
63    Date: 2004/10/13 16:34:00 CDT
64    Tag: blume-20041013-tdp
65    Description:
66    
67    Some rationalization of names:
68    
69       structure BTrace -> structure TDPInstrument
70       etc.
71    
72    This is is preparation of using the original back-trace
73    instrumentation for other purposes.  "TDP" stands for
74    Trace/Debug/Profile.
75    
76    The control flag controlling whether instrumentation is on or off is now
77    registered under a different name, so instead of running sml as
78    
79     sml -Cinstrument.btrace-mode=true
80    
81    one has to say
82    
83     sml -Ctdp.instrument=true
84    
85    ----------------------------------------------------------------------
86    Name: Matthias Blume (blume (at) tti - c (dot) org)
87    Date: 2004/10/11 16:37:00 CDT
88    Tag: blume-20041011-regions
89    Description:
90    
91    Made some minor modifications to elabcore.sml to have source regions
92    be propagated more tightly -- resulting in better (i.e., smaller)
93    regions being reported in error- and debug messages.
94    
95    ----------------------------------------------------------------------
96    Name: Matthias Blume (blume (at) tti - c (dot) org)
97    Date: 2004/10/08 22:50:00 CDT
98    Tag: blume-20041008-cmkw
99    Description:
100    
101    Fixed handling of keywords in .cm files: After seeing "is" the lexer
102    treats subsequent occurrences of "group", "library", "source", "is",
103    "*", and "-" as ordinary identifiers rather than keywords.
104    
105    Most seriously, this fixes a problem with CM's "shell" tool.  The tool
106    is supposed to accept a tool argument called "source", but this did
107    not work because of the clash with the keyword.
108    
109    ----------------------------------------------------------------------
110    Name: Matthias Blume (blume (at) tti - c (dot) org)
111    Date: 2004/10/07 16:00:00 CDT
112    Tag: blume-20041007-cleanup
113    Description:
114    
115    Assorted cleanup work:
116    
117      - got rid of intstrmap in favor of using the library's
118        hash table implementation
119      - threw out most of the pathnames stuff, as it was not used anyway
120      - simplified tokentable implementation
121      - fixed some minor spelling errors
122    
123    ----------------------------------------------------------------------
124    Name: Matthias Blume (blume (at) tti - c (dot) org)
125    Date: 2004/10/06 15:15:15 CDT
126    Tag: blume-20041006-handler
127    Description:
128    
129    Cleaned up the absyn to reflect the invariant that HANDLE always
130    carries a FNexp as part of the type definition.  This eliminates some
131    superfluous sanity checks at runtime down the road.
132    
133    Some minor cleanup of the btrace code.
134    
135    ----------------------------------------------------------------------
136    Name: Matthias Blume (blume (at) tti - c (dot) org)
137    Date: 2004/10/01 10:20:30 CDT
138    Tag: blume-20041001-slave
139    Description:
140    
141    Added hack to make slave mode work in the presence of the version
142    tool.  (Still, since the master does two passes over the code for
143    CMB.make, the release number gets bumped twice when slaves are
144    attached.  I don't know if this is worth fixing...)
145    
146    ----------------------------------------------------------------------
147    Name: Matthias Blume (blume (at) tti - c (dot) org)
148    Date: 2004/09/30 10:55:00 CDT
149    Tag: blume-20040930-version
150    Description:
151    
152    * Moved the "version" magic into its own little library under
153    src/system/smlnj/internal.  This avoids expensive reconstruction
154    of a stable src/compiler/core.cm.
155    
156    * At the same time, structure CompilerVersion is now known as structure
157    SMLNJVersion.
158    
159    * Arranged for the version tool to NOT kick in when rebuilding the system
160      (makeml -rebuild, fixpt).  Otherwise one would never reach a fixpoint.
161      Also, loading the versiontool does not work when rebuilding the system
162      because CM is not properly initialized at that time.
163    
164    ----------------------------------------------------------------------
165    Name: Matthias Blume (blume (at) tti - c (dot) org)
166    Date: 2004/09/29 14:00:00 CDT
167    Tag: blume-20040929-autoversion
168    Description:
169    
170    Implemented some CM magic to have
171        file src/compiler/TopLevel/main/version.sml
172    generated automagically.
173    The version is taken from two files: config/version and config/release.
174    The first is expected to contain a two-part version number such as 110.49.
175    The second should contain a single number, but it may be missing.
176    
177    If the environment variable VERSIONTOOL_BUMP_RELEASE is defined at the
178    time the version tool is loaded (which is the first time you say CMB.make),
179    then the tool will increment the value stored in config/release every
180    time CMB.make is invoked.
181    
182    The binfile format is now insensitive to anything beyond the first
183    two components of a version number, so bumping the release does not render
184    binfiles incompatible.  Auto-bumping can be used to keep track of versions
185    during development without invalidating existing binfiles.
186    
187    In any case, every CMB.make updates the date information in version.sml.
188    (This is the date that is printed in the banner.)
189    
190    ----------------------------------------------------------------------
191    Name: Matthias Blume (blume (at) tti - c (dot) org)
192    Date: 2004/09/28 10:53:00 CDT
193    Tag: blume-20040928-controls
194    Description:
195    
196    Some cleanup of the controls code.
197    
198    ----------------------------------------------------------------------
199    Name: Matthias Blume (blume (at) tti - c (dot) org)
200    Date: 2004/09/27 22:08:00 CDT
201    Tag: blume-20040927-controls
202    Description:
203    
204    Added two pieces of functionality to the Controls interface:
205    
206    1.   val save'restore: 'a control -> unit -> unit
207    
208       grabs the current value of the control in stage 1 and restores it
209       in stage 2.
210    
211    2.   val set' : 'a control * 'a -> unit -> unit
212    
213       stores the given value into the control in stage 2 (i.e., delayed)
214       but does all error checking in stage 1.
215       (This is for string controls that need to do parse their argument --
216        something that might fail.  In some cases, notably in CM, one
217        already knows the intended argument but wants to delay the actual
218        assignment until a time when error recovery would be more difficult.)
219    
220    Changed the handling of controls in tool arguments to classes "sml" and
221    "lazysml":
222       - use Controls.save'restore as a more robust way of restoring the
223         old value (in particular: without having to re-parse the string)
224       - use controls to handle the "overload" keyword in the init group
225         (I believe this change actually fixes a long-standing obscure bug.)
226    
227    ----------------------------------------------------------------------
228    Name: Matthias Blume (blume (at) tti - c (dot) org)
229    Date: 2004/09/27 17:00:00 CDT
230    Tag: blume-20040927-lazysml
231    Description:
232    
233    Added a new tool class called "lazysml" to CM's tool chest.  The only
234    difference to "sml" is that compilation is done with Control.lazysml
235    set to true.  A source of class "lazysml" is automatically recognized
236    by a file name suffix of ".lml".
237    
238    In addition to the above feature, the original class "sml" now also
239    supports a tool argument "lazy" which has the same effect.  As a
240    result, the following three lines are equivalent:
241    
242        foo.sml : lazysml
243        foo.sml : sml (lazy)
244        foo.sml (lazy)
245    
246    The setting goes into effect both during parsing and during
247    compilation.  The original setting is restored right after parsing and
248    after compilation, respectively.
249    
250    In addition to all the above, there is also a general mechanism to set
251    ANY of the "controls" that are available at the command line via
252    "-C..." on a per-sml-file basis.  The same rules that apply for "lazy"
253    apply as well. (In fact, "lazy" is implemented as a special case of
254    the general mechanism.)
255    
256    The .cm file syntax uses a new keyword tool argument called "with".
257    There are several ways of indicating the desired settings:
258    
259        foo.sml (with:parser.quotations=true)
260        foo.sml (with:(name:parser.quotations value:true))
261        foo.sml (with:(name:name1 value:value1 name:name2 value:value2 ...))
262        foo.sml (with:(name1=value1 name2=value2 ...))
263        foo.sml (with:(name1=value1 name:name2 value:value2 name3=value3 ...))
264    
265        etc.
266    
267    Another possible abbreviation is to leave out the =v or value:v part
268    if the name refers to a boolean control (in which case the value is
269    taken to be true).  Thus, one could get lazy sml also by saying:
270    
271        foo.sml (with:parser.lazy-keyword=true)
272        foo.sml (with:parser.lazy-keyword)
273        foo.sml (with:(name:parser.lazy-keyword value:true))
274        foo.sml (with:(name:parser.lazy-keyword))
275    
276    ----------------------------------------------------------------------
277    Name: Matthias Blume (blume (at) tti - c (dot) org)
278    Date: 2004/09/24 16:22:00 CDT
279    Tag: blume-20040924-ppc-long-branch
280    Description:
281    
282    Turned message about "emiting long form of branch" off by default.
283    Added a control flag to turn it back on when desired.
284    
285    ----------------------------------------------------------------------
286    Name: Matthias Blume (blume (at) tti - c (dot) org)
287    Date: 2004/09/24 16:05:00 CDT
288    Tag: blume-20040924-rounding
289    Description:
290    
291    Applied patch for setting rounding modes under Mac OS X.  Thanks to
292    Melissa O'Neill for providing the code!
293    
294    ----------------------------------------------------------------------
295    Name: Matthias Blume (blume (at) tti - c (dot) org)
296    Date: 2004/09/23 17:30:00 CDT
297    Tag: blume-20040923-envvars
298    Description:
299    
300    1. Changed definition of type ControlRegistry.registry_tree to
301       include control_info (i.e., the name of the controlling environment
302       variable).
303    
304    2. Added command-line flags -e and -E to print the names of environment
305       variables that can be used to control internal settings.
306       (This uses the new API mentioned in 1.)
307    
308    ----------------------------------------------------------------------
309    Name: Matthias Blume (blume (at) tti - c (dot) org)
310    Date: 2004/09/13 16:50:00 CDT
311    Tag: Release_110_49
312    Description:
313    
314    New working version (110.49).  NEW BOOTFILES!
315    
316    ----------------------------------------------------------------------
317    Name: Matthias Blume
318    Date: 2004/09/13 16:20:00 CDT
319    Tag: blume-20040913-config-mlrisc
320    Description:
321    
322    Put target "mlrisc" back into the default list.
323    (There is no harm in having it, and some users have expressed their
324    wish to have "mlrisc" included by default.)
325    
326    ----------------------------------------------------------------------
327    Name: John Reppy
328    Date: 2004/09/13
329    Tag: jhr-20040913-signals
330    Description:
331    
332    Fixed the signal masking code to properly nest mask/unmask operations
333    on a per-signal basis.
334    
335    ----------------------------------------------------------------------
336    Name: Matthias Blume (blume (at) tti - c (dot) org)
337    Date: 2004/09/08 13:20:00 CDT
338    Tag: blume-20040908-heap-magic
339    Description:
340    
341    Bumped the heap macig number to 0x09082004 to account for the changed
342    layout of the ML frame under MacOS X.
343    
344    ----------------------------------------------------------------------
345    Name: Allen Leung (leunga (at) reservoir (dot) com)
346    Date: 2004/09/03 11:26:00 EST
347    Tag: leunga-20040903-cygwin-install
348    Description:
349    
350       Added a patch to _arch-n-opsys to enable the Cygwin runtime.
351    The Cygwin runtime is turned on by setting the environment
352    variable SMLNJ_CYGWIN_RUNTIME to 1.
353    
354    ----------------------------------------------------------------------
355    Name: Matthias Blume (blume (at) tti - c (dot) org)
356    Date: 2004/08/31 17:15:00 CDT
357    Tag: blume-20040831-core
358    Description:
359    
360    Added some exports to src/compiler/core.cm upon request by J. Joemann.
361    
362    ----------------------------------------------------------------------
363    Name: Matthias Blume (blume (at) tti - c (dot) org)
364    Date: 2004/08/30 17:55:00 CDT
365    Tag: blume-20040830-installer
366    Description:
367    
368    Upon request by Johannes Joemann:
369    
370    - improved ML code of installer to fall back to coping when renaming
371      fails (i.e., when source and target are on different file systems);
372      the code compiles but has yet to be tested in anger
373    - removed mlrisc from list of default targets (config/targets)
374    
375    ----------------------------------------------------------------------
376    Name: Matthias Blume (blume (at) tti - c (dot) org)
377    Date: 2004/08/27 17:20:00 CDT
378    Tag: blume-20040827-ptreql
379    Description:
380    
381    Added ptreql primop to structure InlineT (upon request from Larry
382    Paulson).
383    
384    ----------------------------------------------------------------------
385    Name: Allen Leung (leunga (at) reservoir (dot) com)
386    Date: 2004/08/15 21:21:00 EST
387    Tag: leunga-110_48-udgraph
388    Description:
389    
390    Another bug fix from Carl Hauser:
391    
392    diff /net/niflab/smlnj48/src/MLRISC/graphs/udgraph.sml udgraph.sml
393    > 48c48
394    > <              | rmv((e as (k,_))::es,L) = rmv(es,if k = i then es else
395    > e::L)
396    > ---
397    > >              | rmv((e as (k,_))::es,L) = rmv(es,if k = i then L else e::L)
398    > Without this, any deletion of an edge in an undirected graph does severe
399    > violence to the graph.
400    
401    ----------------------------------------------------------------------
402    Name: Allen Leung (leunga (at) reservoir (dot) com)
403    Date: 2004/08/10 23:35:00 EST
404    Tag: leunga-110_48-ppc
405    Description:
406    
407       The IBM/MacOS syntax switch on PPC was incorrectly swapped.
408    
409    ----------------------------------------------------------------------
410    Name: Matthias Blume (blume (at) tti - c (dot) org)
411    Date: 2004/08/10 12:00:00 CDT
412    Tag: Release_110_48
413    Description:
414    
415    New working version (110.48).  NEW BOOTFILES!
416    
417    ----------------------------------------------------------------------
418    Name: Allen Leung (leunga (at) reservoir (dot) com)
419    Date: 2004/08/09 12:21:00 EST
420    Tag: leunga-110_47-dijsktra
421    Description:
422    
423    Bug fix from Carl Hauser:
424    
425    single_source_shortest_paths in dijkstra.sml was observed to get wrong
426    answers (by comparing to single_source_shortest_paths in bellman-ford.sml).
427    
428    The problem is that following the expression A.update(dist,s,Num.zero)
429    it is necessary to update the priority queue using Q.decreaseWeight(Q,s).
430    
431    ----------------------------------------------------------------------
432    Name: Matthias Blume (blume (at) tti - c (dot) org)
433    Date: 2004/08/06 18:10:00 CDT
434    Tag: blume-20040806-cmdline
435    Description:
436    
437    Fiddled with handling of command-line options:
438    
439      * sml now quits after processing the command line
440        if -H, -S, -h<n>, or -s<n> appears as the last
441        command-line argument
442      * a new option -q terminates the session when encountered on
443        the command line; subsequent arguments will be ignored
444      * bug fixes: short (erroneous) arguments are no longer ignored
445        completely
446    
447    ----------------------------------------------------------------------
448    Name: Allen Leung (leunga (at) reservoir (dot) com)
449    Date: 2004/08/04 18:17:00 EST
450    Tag: leunga-110_47-ppc-ibm-asm
451    Description:
452    
453      - Added minimal IBM assembly syntax support for PowerPC.
454    
455      - Cygwin: manually changed the file cygwin.def.  Some exported symbols have
456        been altered in the runtime.  We need an automatic way to keep the file
457        in sync.
458    
459    ----------------------------------------------------------------------
460    Name: Matthias Blume (blume (at) tti - c (dot) org)
461    Date: 2004/08/04 14:00:00 CDT
462    Tag: Release_110_47
463    Description:
464    
465    New working version (110.47).  NEW BOOTFILES!
466    
467    ----------------------------------------------------------------------
468    Name: Matthias Blume (blume (at) tti - c (dot) org)
469    Date: 2004/08/03 14:25:00 CDT
470    Tag: blume-20040803-callingconv
471    Description:
472    
473    Added low-level support for choosing C calling conventions by
474    twiddling the type of rawccall.  (See
475    src/compiler/Semant/types/cproto.sml for details.)
476    
477    ----------------------------------------------------------------------
478    Name: Matthias Blume (blume (at) tti - c (dot) org)
479    Date: 2004/08/02 15:55:00 CDT
480    Tag: blume-20040802-backout
481    Description:
482    
483    Backed out of change to win32-filesys.c.  The earlier patch to
484    get_file_time caused CM to produce files with the wrong time stamp.
485    
486    ----------------------------------------------------------------------
487    Name: Matthias Blume (blume (at) tti - c (dot) org)
488    Date: 2004/08/02 14:45:00 CDT
489    Tag: blume-20040802-nlffi-win32
490    Description:
491    
492    Added NLFFI support for Win32, adapted from a patch provided by David
493    Hansel.  This is currently completely untested.  Also, the issue
494    concerning stdcall vs. ccall is still unresolved.
495    
496    ----------------------------------------------------------------------
497    Name: Matthias Blume (blume (at) tti - c (dot) org)
498    Date: 2004/07/30 17:55:00 CDT
499    Tag: blume-20040730-various
500    Description:
501    
502    Gearing up towards 110.47...
503    
504    - various minor bugfixes to ml-nlffigen
505    - a beginning of a manual for nlffi
506    
507    - eliminated 'export name=value' in config/install.sh as this does
508      not work with certain versions of /bin/sh
509      (Thanks to David King at Motorola for catching this.)
510    
511    - several bugfixes provided or suggested by David Hansel at Reactive Systems:
512      - added a test for tm==NULL to gmtime.c and localtime.c
513      - applied patch for incorrect GetFileTime under win32
514      - toSeconds -> toMilliseconds in Win32/win32-process.sml
515    
516    ----------------------------------------------------------------------
517    Name: Matthias Blume (blume (at) tti - c (dot) org)
518    Date: 2004/07/21 18:20:00 CDT
519    Tag: blume-20040721-nlffigen
520    Description:
521    
522    - Fixed minor issue in ml-nlffigen: Now generate structure T_foo
523      for a typedef to an incomplete type, but leave out the "typ" member.
524      (This is just for consistency.)
525    - Started to produce what is supposed to become better (i.e., comprehensive)
526      documentation of what ml-nlffigen does and produces.
527    
528    ----------------------------------------------------------------------
529    Name: Matthias Blume (blume (at) tti - c (dot) org)
530    Date: 2004/07/14 16:25:00 CDT
531    Tag: blume-20040714-union
532    Description:
533    
534    Added C_UNION to c-calls/c-types.sml and updated the machinery
535    (ml-nlffigen, cproto.sml) that conveys C function interface
536    information to the code generator.
537    
538    However, the actual architecture-specific implementation of function
539    arguments and results that are C unions is still not implemented.
540    
541    ----------------------------------------------------------------------
542    Name: Allen Leung (leunga (at) reservoir (dot) com)
543    Date: 2004/07/14 14:38:00 EST
544    Tag: leunga-110_46_1-ppc-lwzu
545    Description:
546    
547        Added these instructions to the PowerPC architecture:
548        LBZU(X), LHZU(X), LWZU(X),
549        STWU(X), STFDU, STFSU
550    
551        etc...
552    
553        Note: I haven't added their instruction encoding into the description.
554    
555    ----------------------------------------------------------------------
556    Name: Allen Leung (leunga (at) reservoir (dot) com)
557    Date: 2004/07/13 15:04:00 EST
558    Tag: leunga-110_46_1-ppc-lwarx
559    Description:
560    
561       Added the two instructions LWARX and STWCX to the PowerPC
562    instruction set.
563    
564       A (untested) rewrite of loop-structure.sml.  The old version
565    is completely broken.
566    
567    ----------------------------------------------------------------------
568    Name: Matthias Blume (blume (at) tti - c (dot) org)
569    Date: 2004/07/13 13:50:00 CDT
570    Tag: blume-20040713-nlffi
571    Description:
572    
573    - use paramAlloc to report c-calls with too many arguments
574      (for PPC version where parameter area is pre-allocated)
575    - added ccall_maxargspace to machspec (to implement the above)
576    - made "make" commend in CM's "make" tool configurable
577    - added option (default: on) for passing the name of the SML/NJ's "bin"
578      directory to "make"; the call looks like this:
579    
580         make <options> SMLNJ_BINDIR=<dir> <target>
581    
582      This can be used by the Makefile to, e.g., pick the "right" version
583      of ml-nlffigen.
584    - minor code tweaks
585    
586    ----------------------------------------------------------------------
587    Name: Matthias Blume (blume (at) tti - c (dot) org)
588    Date: 2004/07/12 22:50:00 CDT
589    Tag: blume-110_46_1-macosx-nlffi
590    Description:
591    
592    NLFFI under Mac OS X now working (sort of).  This is largely untested,
593    though.
594    
595    Note:  1. You have to make a new, clean build of the runtime system.
596           2. There are new BOOTFILES, you have to use them!
597              (Doing the bootstrap process yourself would be *very* painful!
598               If you absolutely have to do it, build the system under
599               a different architecture and then cross-compile.)
600    
601    Version bumped to 110.46.1 to account for runtime data format changes.
602    
603    ----------------------------------------------------------------------
604    Name: Matthias Blume (blume (at) tti - c (dot) org)
605    Date: 2004/06/18 14:30:00 CDT
606    Tag: blume-20040618-unix
607    Description:
608    
609    Changed the implementation of structure Unix so that the same stream
610    is returned every time one of the {text,bin}{In,Out}streamOf functions
611    is invoked on the same proc.  This is not what the spec currently
612    says -- although IMO it arguably should.  (See discussion below.)
613    
614    ----------------------------------------------------------------------
615    Name: Matthias Blume (blume (at) tti - c (dot) org)
616    Date: 2004/06/17 18:15:00 CDT
617    Tag: Release_110_46
618    Description:
619    
620    New working version (110.46).  NEW BOOTFILES!
621    
622    ----------------------------------------------------------------------
623    Name: Matthias Blume (blume (at) tti - c (dot) org)
624    Date: 2004/06/17 17:20:00 CDT
625    Tag: blume-20040617-timer-unix
626    Description:
627    
628    Changed the interface of structures Timer and Unix to match the most
629    recent Basis spec.
630    
631    In the case of Unix there still seems to be an open/weird issue:
632    
633       The {text,bin}{In,Out}streamOf functions are supposed to create
634       fresh streams whenever they are called -- as opposed to have them
635       return the same stream every time.  This design is supposed to
636       prevent space leaks caused by proc values hanging on to streams.
637    
638       The reap function, on the other hand, is supposed to close the
639       streams.  This cannot be done without having a handle on the
640       stream in proc after all...
641    
642    I took the liberty to implement the following stopgap solution:
643    
644      The proc value hangs on to the most recently created stream(s).
645      Reap closes those.  If either or both of the two streams hadn't
646      been created at all yet, then reap will close the corresponding
647      file descriptors directly.
648    
649    PS: I don't understand the original space leak argument anymore.  If
650    a proc hangs on to the imperative stream, then I/O operations on those
651    will advance the state of the cached stream and avoid the space leak.
652    
653    ----------------------------------------------------------------------
654    Name: Matthias Blume (blume (at) tti - c (dot) org)
655    Date: 2004/05/28 16:45:00 CDT
656    Tag: blume-20040528-basis
657    Description:
658    
659    Added signature PACK_REAL and exported functor PrimIO.
660    
661    ----------------------------------------------------------------------
662    Name: Matthias Blume (blume (at) tti - c (dot) org)
663    Date: 2004/05/25 16:00:00 CDT
664    Tag: blume-20040525-group-owner
665    Description:
666    
667    CM now ignores (but still accepts) the "owner" information in group
668    descriptions.  The owner of a group is its next enclosing
669    library. Each group must have a unique owner.  (There is a virtual
670    "toplevel" library that owns groups which are not nested within a real
671    library.)  Previously, each group had to explicitly declare its owner,
672    and CM would check that such a declaration is correct.  The new scheme
673    is to have CM check that for each group there is precisely one owning
674    library.
675    
676    The advantage of the new scheme is that the programmer no longer needs
677    to maintain the somewhat annoying owner information.  The downside is
678    that CM cannot enforce the ownership rule across multiple runs of
679    CM.make.  Fortunately, enclosing the same group in two different
680    libraries A and B which are not part of the same program does not
681    cause real problems.
682    
683    ----------------------------------------------------------------------
684    Name: Matthias Blume (blume (at) tti - c (dot) org)
685    Date: 2004/05/20 16:00:00 CDT
686    Tag: blume-20040520-win32
687    Description:
688    
689    Made the win32 version work again.  (Strangely, a misplaced comma had
690    slipped into win32-process.c which prevented the runtime from being
691    compiled correctly.)
692    
693    Also, included a minor addition to ml-build.bat analogous to what was
694    done in blume-20040519-ml-build.
695    
696    ----------------------------------------------------------------------
697    Name: Matthias Blume (blume (at) tti - c (dot) org)
698    Date: 2004/05/19 22:10:00 CDT
699    Tag: blume-20040519-ml-build
700    Description:
701    
702    Arranged for ml-build to clean up after itself a little bit better.
703    The script generates a temporary SML source file and compiles it using
704    CM, so CM generates metadata (GUID, SKEL, objectfile) for it.  It now
705    gets rid of those at the end, so they don't accumulate under .cm.
706    
707    This required a minor change to install.sh because the name of the
708    metadata directory (default: .cm) is actually configurable at
709    installation time.
710    
711    ----------------------------------------------------------------------
712    Name: Matthias Blume (blume (at) tti - c (dot) org)
713    Date: 2004/05/18 15:50:00 CDT
714    Tag: blume-20040518-mkreader
715    Description:
716    
717    Added Posix.IO.mk{Bin,Text}{Reader,Writer} by lifting their respective
718    implementations from internal modules PosixBinPrimIO and PosixTextPrimIO.
719    
720    ----------------------------------------------------------------------
721    Name: Matthias Blume (blume (at) tti - c (dot) org)
722    Date: 2004/05/11 14:35:00 CDT
723    Tag: blume-20040511-win32sock
724    Description:
725    
726    Added previously missing support for many socket-related functions
727    under win32.  Thanks to David Hansel <hansel@reactive-systems.com>
728    for the voluminous patch!
729    
730    (I have not tested this patch under win32 yet.)
731    
732    Here is David's e-mail:
733    
734    Hi,
735    
736    Attached to this email you find a diff against sml/nj 110.45
737    that will enable socket support under Windows.
738    
739    To apply the patch (using unix or cygwin)
740    1) gunzip runtime.diff.gz
741    2) "cd" into "src/runtime" in the source tree of a fresh
742       110.45 installation.
743    3) patch -p 1 < [your/path/to]runtime.diff
744    
745    The code compiles fine but has NOT yet been extensively tested.
746    I only ran a few tests for basic socket client functionality
747    (which worked fine).  Especially the functions that use ioctl
748    are not tested at all and might not work (see below).
749    
750    I implemented this since we want to move to a newer version of sml/nj
751    but need socket support in order to use it.  This is the first time I
752    even had a look at the sml/nj source,  so please review my changes
753    before making this part of the distribution!  Here are a few issues
754    that I think might be better for someone to solve who is more
755    familiar with the sml/nj source (and socket programming):
756    
757    - getnetbyaddr.c and getnetbyname.c will raise a "not implemented"
758      exception since I could not figure out what the windows equivalent
759      of these functions is
760    
761    - In sockets-osdep.h there are a some #include statements that are
762      only used in a few files that include sockets-osdep.h
763    
764    - In smlnj-sock-lib.c, function init_fn() calls WSAStartup() but
765      does not process its return value since I don't know how to
766      report an error upwards.
767    
768    - It would probably be good to have a call to WSACleanup() when
769      the library is unloaded (if there is such a possibility).
770      Otherwise I think Windows will take care of this automatically
771      when the process finishes.
772    
773    - I used ioctlsocket() as a replacement for ioctl() but I have
774      no idea if that is actually the proper replacement on Windows.
775    
776    - All these issues are marked in the code by "FIXME" comments.
777    
778    We use sml/nj extensively in our products and are quite happy
779    with it.  I hope this contribution will help you.
780    
781    Keep up the good work!
782    
783    David
784    
785    ----------------------------------------------------------------------
786    Name: Matthias Blume (blume (at) tti - c (dot) org)
787    Date: 2004/05/11 14:20:00 CDT
788    Tag: blume-20040511-installml
789    Description:
790    
791    Fixed two bugs in installml script.  (Thanks to Vesa A. Norrman for
792    the patch.)
793    
794    ----------------------------------------------------------------------
795    Name: Matthias Blume (blume (at) tti - c (dot) org)
796    Date: 2004/05/11 14:05:00 CDT
797    Tag: blume-20040511-nlffi-netbsd
798    Description:
799    
800    Added support for nlffi under netbsd.  (Thanks to Vesa A. Norrman for
801    the patch.)
802    
803    ----------------------------------------------------------------------
804    Name: Matthias Blume (blume (at) tti - c (dot) org)
805    Date: 2004/05/11 12:05:00 CDT
806    Tag: blume-20040511-exports
807    Description:
808    
809    As per request by Adam Chlipala <adam@hcoop.net>, extended various
810    export lists in compiler-related .cm-files.
811    
812    ----------------------------------------------------------------------
813    Name: Matthias Blume (blume (at) tti - c (dot) org)
814    Date: 2004/05/11 11:35:00 CDT
815    Tag: blume-20040511-allsource
816    Description:
817    
818    The installer now honors the "src-smlnj" target again, although its meaning
819    has changed from "all sources required for the compiler" to "all sources
820    the installer knows about".  In other words, if you enable "src-smlnj"
821    in the "targets" file, then the installer will pull in sources for
822    everything.  (Notice that this refers to source code only.  Compiled
823    code is still only installed for modules that were requested explicitly
824    or which are required for other modules that were requested explicitly.)
825    
826    ----------------------------------------------------------------------
827    Name: Matthias Blume (blume (at) tti - c (dot) org)
828    Date: 2004/04/23 17:40:00 CDT
829    Tag: blume-20040423-ieee-scan
830    Description:
831    
832    Fixed IEEEReal.scan (and .fromString) so that if there is an overflow
833    in the exponent calculation we get INF or ZERO (depending on the mantissa
834    and the sign of the exponent).
835    
836    ----------------------------------------------------------------------
837    Name: Matthias Blume (blume (at) tti - c (dot) org)
838    Date: 2004/04/23 10:40:00 CDT
839    Tag: blume-20040423-ml-build
840    Description:
841    
842    The ml-build script now terminates with a non-0 status when something
843    goes wrong.
844    
845    ----------------------------------------------------------------------
846    Name: Matthias Blume (blume (at) tti - c (dot) org)
847    Date: 2004/04/22 16:35:00 CDT
848    Tag: blume-20040422-Option
849    Description:
850    
851    Made exception Option to be the same as exception Option.Option
852    (as it should be).
853    
854    ----------------------------------------------------------------------
855    Name: Allen Leung (leunga (at) reservoir (dot) com)
856    Date: 2004/03/19 14:40:00 EST
857    Tag: leunga-20040319-cygwin-nlffi
858    Description:
859    
860    Fixed the runtime so that ml-nlffi-lib runs on the cygwin version
861    of SML/NJ.  The problem is that
862    
863       lib = dlopen(NULL, ...)
864       f   = dlsym(lib, "malloc");
865    
866    does not work on Windows unless we explicitly export symbols
867    such as 'malloc' during linking.  We fixed this by explicitly
868    exporting the required symbols with the magic gcc incantation:
869    
870        -Wl,--export-all cygwin.def
871    
872    where cygwin.def is a file containing all the symbols that
873    we wish to export.
874    
875    I suspect this is a Windows problem and we'll have to
876    do the same (somehow with windows compilers) when
877    we build the native win32 version with the system
878    calls LoadLibrary/GetProcAddress.
879    
880    ----------------------------------------------------------------------
881    Name: Matthias Blume (blume (at) tti - c (dot) org)
882    Date: 2004/03/04 16:35:00 CST
883    Tag: blume-20040304-intinf-fmt
884    Description:
885    
886    Fixed problem with IntInf.fmt (sign would show up on the right instead
887    of on the left for BIN, OCT, and HEX).
888    
889    ----------------------------------------------------------------------
890    Name: Matthias Blume (blume (at) tti - c (dot) org)
891    Date: 2004/03/04 11:25:00 CST
892    Tag: blume-20040304-symlinks
893    Description:
894    
895    Fixed problem with installer script (unix only) where bin/ml-yacc and
896    friends pointed (via symlinks) to absolute locations instead of just
897    .run-sml.  This was reported by Vesa A Norrman.
898    
899    ----------------------------------------------------------------------
900    Name: Matthias Blume (blume (at) tti - c (dot) org)
901    Date: 2004/02/13 14:50:00 CST
902    Tag: Release_110_45
903    Description:
904    
905    New working version (110.45). New bootfiles.
906    
907    ----------------------------------------------------------------------
908    Name: Matthias Blume (blume (at) tti - c (dot) org)
909    Date: 2004/01/26 15:15:15 CST
910    Tag: blume-20040126-toplevel
911    Description:
912    
913    Improved handling of exceptions at the interactive toplevel.
914    
915    ----------------------------------------------------------------------
916    Name: Matthias Blume (blume (at) tti - c (dot) org)
917    Date: 2004/01/26 11:25:00
918    Tag: blume-20040126-app
919    Description:
920    
921    Type of top-level "app" corrected.
922    Added code for setting vp_limitPtrMask to Win32-specific runtime.
923    
924    ----------------------------------------------------------------------
925    Name: Matthias Blume (blume (at) tti - c (dot) org)
926    Date: 2003/11/18 17:10 CST
927    Tag: blume-20031118-basis-fiddle
928    Description:
929    
930    - changed Timer interface to what might become the spec
931    - POSIX_FLAGS -> BIT_FLAGS according to spec
932    - some other minor discrepancies wrt. spec eliminated
933    
934    ----------------------------------------------------------------------
935    Name: Matthias Blume (blume (at) tti - c (dot) org)
936    Date: 2003/11/06 12:00:00 CST
937    Tag: Release_110_44
938    Description:
939    
940    New working version (110.44). New bootfiles.
941    
942    ----------------------------------------------------------------------
943    Name: Matthias Blume (blume (at) tti - c (dot) org)
944    Date: 2003/11/04 11:50:00 CST
945    Tag: blume-20031104-move-libraries
946    Description:
947    
948    Eliminated the "dont_move_libraries" directive in config/targets.
949    (The mechanism was broken and could not be fixed easily.  Moreover,
950    there does not seem to be any reason not to move all libraries into
951    lib during installation.  I originally implemented this directive as a
952    backward-compatibility feature when I first introduced the new CM.
953    Now that things have been stable for a long time and going back to the
954    old CM is not an option, there is no reason to keep it around.)
955    
956    ----------------------------------------------------------------------
957    Name: Matthias Blume (blume (at) tti - c (dot) org)
958    Date: 2003/11/03 16:00:00 CST
959    Tag: blume-20031103-installdir
960    Description:
961    
962    Made installer honor INSTALLDIR variable again.  (Thanks to Chris
963    Richards for pointing out the problem and providing the solution.)
964    
965    ----------------------------------------------------------------------
966    Name: Matthias Blume (blume (at) tti - c (dot) org)
967    Date: 2003/10/01 17:05:00 CDT
968    Tag: blume-20031001-lal-mlrisc
969    Description:
970    
971    MLRISC bug fix from Lal.
972    
973    ----------------------------------------------------------------------
974    Name: Matthias Blume (blume (at) tti - c (dot) org)
975    Date: 2003/09/30 16:10:00 CDT
976    Tag: blume-20030930-primio-bat
977    Description:
978    
979    1. Added openVector, nullRd, and nullWr to PRIM_IO.
980    2. Improved .bat files (for Win32 port) to make things work under Win95.
981       (thanks to Aaron S. Hawley for this one)
982    
983    ----------------------------------------------------------------------
984    Name: Matthias Blume (blume (at) tti - c (dot) org)
985    Date: 2003/09/26 16:05:00 CDT
986    Tag: blume-20030926-wrappriv
987    Description:
988    
989    Added missing wrapper for privilege "primitive" in $smlnj/viscomp/core.cm.
990    
991    ----------------------------------------------------------------------
992    Name: Matthias Blume (blume (at) tti - c (dot) org)
993    Date: 2003/09/26 15:00:00 CDT
994    Tag: blume-20030926-110_43_3
995    Description:
996    
997    - additional cleanup
998    - version number bump, NEW BOOTFILES
999    
1000    ----------------------------------------------------------------------
1001    Name: Matthias Blume (blume (at) tti - c (dot) org)
1002    Date: 2003/09/26 12:00:00 CDT
1003    Tag: blume-20030926-ppautoload
1004    Description:
1005    
1006    I modified the read-eval-print loop so that the autoloader gets
1007    invoked whenever the prettyprinter tries to look up a symbol that
1008    is not currently defined in the toplevel environment but which
1009    appears in CM's autoload registry.  As a result, we see far fewer of
1010    those ?.Foo.Bar.xxx names in the prettyprinter's output.
1011    
1012    In addition to this I tried to clean up some pieces of the Basis
1013    implementation (e.g., Socket, Word8Array) in order to prevent other
1014    instances of these ?.Foo.Bar.xxx names from being printed.
1015    
1016    The mechanism that picks names for types still needs some work, though.
1017    (Right now it seems that if there is a type A.t which is defined to
1018    be B.u, but B is unavailable at toplevel, then A.t gets printed as
1019    "?.B.u" although the perhaps more sensible solution would be to use
1020    "A.t" in this case.  In other words, the prettyprinter should follow
1021    a chain of DEFtycs not farther than there are corresponding toplevel
1022    names in the current environment.)
1023    
1024    ----------------------------------------------------------------------
1025    Name: Matthias Blume (blume (at) tti - c (dot) org)
1026    Date: 2003/09/24 16:31:00 CDT
1027    Tag: blume-20030924-installer
1028    Description:
1029    
1030    Another installer tweak:  All the ML code for the installer is now
1031    compiled during CMB.make and put into a little library called
1032    $smlnj/installer.cm.  The installation then simply invokes
1033    
1034       sml -m $smlnj/installer.cm
1035    
1036    and everything happens automagically.
1037    
1038    Win32:  ML code senses value of environment variable SMLNJ_HOME.
1039    Unix:   ML code senses values of environment variables ROOT, CONFIGDIR,
1040            and BINDIR.
1041    
1042    The new scheme guarantees that the ML code responsible for the installation
1043    is in sync with the APIs of the main system.  Also, the installer is
1044    somewhat faster because the installer script is precompiled.
1045    
1046    ----------------------------------------------------------------------
1047    Name: Matthias Blume (blume (at) tti - c (dot) org)
1048    Date: 2003/09/24 15:35:00 CDT
1049    Tag: blume-20030924-synsock
1050    Description:
1051    
1052    Added a signature SYNCHRONOUS_SOCKET to basis.cm.  This is like SOCKET
1053    but excludes all non-blocking operations.  Defined SOCKET (in Basis)
1054    and CML_SOCKET in terms of SYNCHRONOUS_SOCKET.  Removed superfluous
1055    implementations of non-blocking operations from CML's Socket
1056    structure.
1057    
1058    ----------------------------------------------------------------------
1059    Name: Matthias Blume (blume (at) tti - c (dot) org)
1060    Date: 2003/09/24 15:10:05 CDT
1061    Tag: blume-20030924-sockets
1062    Description:
1063    
1064    1. Fixed SOCKET API and implementation to match Basis spec.
1065       This required changing the internal representation of sockets to one
1066       that remembers (for each socket file descriptor) whether it is currently
1067       blocking or non-blocking.  This state is maintained lazily (i.e., a system
1068       call is made only if the state actually needs to change).
1069    
1070    2. OS-specific details of sockets were moved into separate files, thus
1071       making it possible to unify the bulk of the socket implementations
1072       between Unix and Win32.
1073    
1074    3. CML's socket API changed accordingly.
1075       (Note that we need to remove non-blocking functions from this API
1076       since they are redundant in the case of CML!)
1077    
1078    4. CML's socket implementation now makes use of non-blocking functions
1079       provided by Basis, thus removing all OS-dependent code from this part
1080       of CML.
1081    
1082    5. Changed Real64.precision from 52 to 53.  Minor cleanup in Real64 code.
1083    
1084    ----------------------------------------------------------------------
1085    Name: Matthias Blume (blume (at) tti - c (dot) org)
1086    Date: 2003/09/22 12:10:00 CDT
1087    Tag: blume-20030922-110_43_2
1088    Description:
1089    
1090    Made a new interim version and bootfiles for developer's bootstrapping
1091    convenience.
1092    
1093       110.43.2 -- NEW BOOTFILES
1094    
1095    ----------------------------------------------------------------------
1096    Name: Matthias Blume (blume (at) tti - c (dot) org)
1097    Date: 2003/09/19 15:55:00 CDT
1098    Tag: blume-20030919-cmdir
1099    Description:
1100    
1101    1. new-install.sh -> install.sh
1102    2. changed default CM "metadata" directory name to ".cm" (instead of "CM")
1103    3. tweaked installer so that another name instead of .cm can be chosen
1104       at install time (by setting the CM_DIR_ARC environment variable
1105       during installation); once installation is complete, the name is
1106       fixed
1107    
1108    ----------------------------------------------------------------------
1109    Name: Matthias Blume (blume (at) tti - c (dot) org)
1110    Date: 2003/09/18 16:00:00 CDT
1111    Tag: blume-20030918-110_43_1
1112    Description:
1113    
1114    Made a new interim version and bootfiles for developer's bootstrapping
1115    convenience.
1116    
1117       110.43.1 -- NEW BOOTFILES
1118    
1119    ----------------------------------------------------------------------
1120    Name: Matthias Blume (blume (at) tti - c (dot) org)
1121    Date: 2003/09/18 15:20:00 CDT
1122    Tag: blume-20030918-misc
1123    Description:
1124    
1125    1. Exported fractionsPerSecond etc. from TimeImp (but not from Time as
1126       this seems to be controversial at the moment) and used those in
1127       Posix.ProcEnv.times.
1128    
1129    2. Added Time.{from,to}Nanoseconds to Time.
1130    
1131    3. Improved Real.{from,to}LargeInt by avoiding needless calculations.
1132       For example, fromLargeInt never needs to look at more than 3 "big
1133       digits" to get its 53 bits of precision.
1134    
1135    ----------------------------------------------------------------------
1136    Name: Matthias Blume (blume (at) tti - c (dot) org)
1137    Date: 2003/09/17 16:30:00 CDT
1138    Tag: blume-20030917-real32-slices
1139    Description:
1140    
1141    Added an entry to the primitive environment
1142    (compiler/Semant/statenv/prim.sml) for int32->real64 conversion and
1143    added code to compiler/CodeGen/main/mlriscGen.sml to implement it.
1144    
1145    Removed some of the "magic" constants in real64.sml and replaced them
1146    with code that generates these values from their corresponding
1147    integer counterparts.
1148    
1149    Made all(?) the slice-related changes to the Basis and made everything
1150    compile again...
1151    
1152    ----------------------------------------------------------------------
1153    Name: Matthias Blume (blume (at) tti - c (dot) org)
1154    Date: 2003/09/15 17:45:00 CDT
1155    Tag: blume-20030915-rbase
1156    Description:
1157    
1158    Fixed bug in Real.fromLargeInt.
1159    
1160    ----------------------------------------------------------------------
1161    Name: Matthias Blume (blume (at) tti - c (dot) org)
1162    Date: 2003/09/13 18:11:00 CDT
1163    Tag: blume-20030913-libinstall
1164    Description:
1165    
1166    Minor bugfix in config/libinstall (set anchor with path to
1167    standalone tool after installing it, otherwise libraries that
1168    need ml-lex or ml-yacc won't compile the first time the installer
1169    runs).
1170    
1171    ----------------------------------------------------------------------
1172    Name: Matthias Blume (blume (at) tti - c (dot) org)
1173    Date: 2003/09/12 11:45:00 CDT
1174    Tag: blume-20030912-various
1175    Description:
1176    
1177     - fixed bug in Real.toLargeInt
1178     - fixed bug in Posix.ProcEnv.times
1179     - changed inputLine functions to return an option
1180     - minor installer improvements / bugfixes
1181     - changed default @SMLalloc parameter for x86/celeron to 64k
1182    
1183    ----------------------------------------------------------------------
1184    Name: Matthias Blume (blume (at) tti - c (dot) org)
1185    Date: 2003/09/09 22:00:00 CDT
1186    Tag: Release_110_43
1187    Description:
1188    
1189        New working release 110.43.  New bootfiles.
1190    
1191    ----------------------------------------------------------------------
1192    Name: Matthias Blume (blume (at) tti - c (dot) org)
1193    Date: 2003/09/09 19:20:00 CDT
1194    Tag: blume-20030909-installer
1195    Description:
1196    
1197    Rewrote large parts of config/install.sh in SML (config/libinstall.sml).
1198    Modified config/install.bat to take advantage of it.  Also modified
1199    config/install.sh (and called it config/new-install.sh) to take advantage
1200    of it on Unix systems.  (The SML code is (supposed to be) platform-
1201    independent.)
1202    
1203    The installer can now install everything under Win32
1204    as well as under *nix as long as it compiles.
1205    
1206    Other changes:
1207    
1208      - made CML compile again under Win32
1209      - made eXene compile under Win32 (by providing a fake structure UnixSock
1210        and by using OS.Process.getEnv instead of Posix.ProcEnv.getenv)
1211      - fixed a bug in nowhere: it assumed that type OS.Process.status is the
1212        same as type int;  under Win32 it isn't
1213      - fixed some slice-related problems in the win32-specific parts of CML
1214      - added a functor argument "sameVol" to os-path-fn.sml in the Basis
1215        (under Win32, the volume name is case-insensitive, and the
1216        OS.Path code compares volume names for equality)
1217    
1218    ----------------------------------------------------------------------
1219    Name: Matthias Blume (blume (at) tti - c (dot) org)
1220    Date: 2003/09/08 11:55:00 CDT
1221    Tag: blume-20030908-fullpath
1222    Description:
1223    
1224    Made Win32 version of OS.FileSys.fullPath return current directory
1225    when given an empty string.  This is what the spec says, and incidentally,
1226    CM depends on it.  (CM otherwise goes into an infinite loop in certain
1227    cases when presented with the name of a non-existing .cm file.)
1228    
1229    ----------------------------------------------------------------------
1230    Name: Matthias Blume (blume (at) tti - c (dot) org)
1231    Date: 2003/09/04 16:30:00 CDT
1232    Tag: blume-20030905-slices-etc
1233    Description:
1234    
1235      1. Changed interface to vectors and arrays in Basis to match
1236         (draft) Basis spec.
1237      2. Added signatures and implementations of slices according to
1238         Basis spec.
1239      3. Edited source code throughout the system to make it compile again
1240         under 1. and 2.  (In some cases code had to be added to have it
1241         match the new signatures.)
1242      4. MLRISC should be backward-compatible: the copies of the originals
1243         of files that needed to change under 3. were retained, the .cm files
1244         check the compiler version number and use old versions when
1245         appropriate.
1246      5. Changed type of OS.FileSys.readDir and Posix.FileSys.readdir to
1247         dirstream -> string option (in accordance with Basis spec).
1248      6. When generating code that counts lines, ml-lex used function
1249         CharVector.foldli, taking advantage of its old interface.
1250         This has been replaced with the corresponding code from
1251         CharVectorSlice.  (html-lex must be re-lexed!)
1252      7. BitArray in smlnj-lib/Util has been extended/modified to match the
1253         new MONO_ARRAY signature.  (Do we need BitArraySlice?)
1254      8. Removed temporary additions (fromInternal, toInternal) from the
1255         (now obsolete) IntInf in smlnj-lib/Util.
1256      9. Cleaned up structure Byte.
1257     10. Added localOffset, scan, and fromString to Date (according to spec).
1258         Cleaned/corrected implementation of Date.
1259         (Still need to check for correctness; implement better canonicalizeDate.)
1260     11. Added "scan" to signature IEEE_REAL.
1261     12. Some improvements to IntInf [in particular: efficiency-hack for
1262         mod and rem when second operand is 2 (for parity checks).]
1263     13. Changed representation of type Time.time, using a single IntInf.int
1264         value counting microseconds.  This considerably simplified the
1265         implementation of structure Time.  We now support negative time
1266         values; scan and fromString handle signs.
1267     14. Functor PrimIO now takes two additional arguments (VectorSlice and
1268         ArraySlice).
1269    
1270    ----------------------------------------------------------------------
1271    Name: Matthias Blume (blume (at) tti - c (dot) org)
1272    Date: 2003/08/28 17:00:00 CDT
1273    Tag: blume-20030828-intinf
1274    Description:
1275    
1276    This is a major update which comes with a version number bump
1277    (110.42.99 -- yes, we are really close to 110.43 :-), NEW BOOTFILES,
1278    and an implementation of IntInf in the Basis.
1279    
1280    There are a fairly large number of related changes and updates throughout
1281    the system:
1282    
1283    Basis:
1284            - Implemented IntInf.
1285            - Made LargeInt a projection of IntInf (by filtering through INTEGER).
1286            - Added some missing Real64 operations, most notably Real.toLargeInt.
1287            - Added FixedInt as a synonym for Int32.
1288    
1289    compiler:
1290            * Added support for a built-in intinf type.
1291              - literals
1292              - pattern matching
1293              - conversion shortcuts (Int32.fromLarge o Int.toLarge etc.)
1294              - overloading on literals and operations
1295    
1296            This required adding a primitive type intinf, some additional
1297            primops, and implementations for several non-trivial intinf
1298            operations in Core.  (The intinf type is completely abstract
1299            to the compiler; all operations get delegated back to the Core.)
1300    
1301            * Intinf equality is handled by polyequal.  However, the compiler
1302            does not print its usual warning in this case (since polyequal
1303            is the right thing to do there).
1304    
1305            * Improved the organization of structure InlineT.
1306    
1307            * A word about conversion primops:
1308            If conversions involving intinf do not cancel out during
1309            CPS contract, then the compiler must insert calls to Core functions.
1310            Since all core access must be resolved already during the FLINT
1311            translate phase, it would be too late a the time of CPS contract
1312            to add new Core calls.  For this reason, conversion primops
1313            for intinf carry two arguments:  1. the numeric argument that
1314            they are supposed to convert, and 2. the Core function that
1315            can help with this conversion if necessary.  If CPS contract
1316            eliminates a primop, then the associated Core function becomes
1317            dead and goes away.  Intinf conversion primops that do not get
1318            eliminated by CPS contract get rewritten into calls of their
1319            core functions by a separate, new phase.
1320    
1321    interactive system:
1322            - Control.Print.intinfDepth controls max length of intinf constants
1323            being printed. (Analogous to Control.Print.stringDepth.)
1324            - Cleanup in printutil and pputil: got rid of unused stuff and
1325            duplicates; replaced some of the code with code that makes better
1326            use of library functionality.
1327    
1328    CM:
1329            Bugfix: parse-errors in init group (system/smlnj/init/init.cmi)
1330            are no longer silent.
1331    
1332    CKIT:
1333            Fixed mismatched uses of Int32 and LargeInt.  I always decided
1334            in favor of LargeInt -- which is now the same as IntInf.
1335            CKIT-knowledgable people should check whether this is what's
1336            intended and otherwise change things back to using Int32 or
1337            FixedInt.
1338    
1339    Throughout the code:
1340            Started using IntInf.int literals and built-in operations
1341            (e.g., comparison with 0) where this seems appropriate.
1342    
1343    
1344    ----------------------------------------------------------------------
1345    Name: Dave MacQueen (dbm@cs.uchicago.edu)
1346    Date: 2003/08/13 11:36:00 CDT
1347    Tag: dbm-20030813-mcz-merge1
1348    Description:
1349    
1350    Merging changes from the mcz-branch development branch into trunk.
1351    These changes involve replacement of the emulated old prettyprinter
1352    interface with direct use of the SML/NJ Lib PP library, and fixing
1353    of a couple of bugs (895, 1186) relating to error messages.  A new
1354    prettyprinter for ast datatypes (Elaborator/print/ppast.{sig,sml})
1355    has been added.
1356    
1357    ----------------------------------------------------------------------
1358    Name: Matthias Blume (blume (at) tti - c (dot) org)
1359    Date: 2003/08/11 15:45:00 CDT
1360    Tag: blume-20030811-windows
1361    Description:
1362    
1363    Version number bumped to 110.42.9.  NEW BOOTFILES!!!
1364    
1365        http://smlnj.cs.uchicago.edu/dist/working/110.42.9/
1366    
1367    This patch restores SML/NJ's ability to run under win32.  There are a
1368    number of changes, including fixes for several bugs that had gone
1369    unnoticed until now:
1370    
1371      - uname "CYGWIN_NT*" is recognized as win32 (This is relevant only when
1372        trying to run the win32 version from within cygwin.)
1373    
1374      - There are a number of simple .bat scripts that substitute for their
1375        corresponding Unix shell-scripts.  (See below.)
1376    
1377      - The internals of ml-build have been modified slightly.  The main
1378        difference is that instead of calling ".link-sml" (or link-sml.bat)
1379        using OS.Process.system, the ML process delegates this task back
1380        to the script.  Otherwise problems arise in mixed environments such
1381        as Cygwin where scripts look and work like Unix scripts, but
1382        where OS.Process.system cannot run them.
1383    
1384      - In CM, the srcpath pickler used native pathname syntax -- which
1385        is incorrect in the case of cross-compilation.  The new pickle format
1386        is independent of platform-specific naming conventions.
1387    
1388      - Path configuration files (such as lib/pathconfig) can now choose
1389        between native and standard syntax.  Placing a line of the form
1390    
1391            standard!
1392    
1393        into the file causes all subsequent paths to be interpreted using
1394        CM standard pathname syntax (= Unix conventions); a line
1395    
1396            native!
1397    
1398        switches back to native style.  This was needed so that
1399        path config files can be written portably, see src/system/pathconfig.
1400    
1401      - Runtime system:
1402    
1403          - win32-filesys.c:  get_file_time and set_file_time now
1404            access modification time, not creation time.
1405    
1406          - I/O code made aware of new array representation.
1407    
1408          - Bug fixes in X86.prim.masm.
1409    
1410       - src/system/makeml made aware of win32. (For use under cygwin
1411            and other Unix-environments for windows.)
1412    
1413       - In Basis, fixed off-by-one error in win32-io.sml (function vecF)
1414         which caused BinIO.inputAll to fail consistently.
1415    
1416    .bat scripts:
1417    
1418       Windows .bat scripts assume that SMLNJ_HOME is defined.
1419    
1420       - sml.bat, ml-yacc.bat, ml-lex.bat:  Driver scripts for standalone
1421         applications (sml, ml-yacc, ml-lex).
1422       - ml-build.bat: analogous to ml-build.
1423       - config\install.bat:  Analogous to config/install.sh.  This requires
1424         that SMLNJ_HOME is set and that Microsoft Visual C is ready to use.
1425         (nmake etc. must be on the path, and vcvars32 must have been run.)
1426         Moreover, sources for ml-lex and ml-yacc need to exist under src,
1427         and the bootfile hierarchy must have been unpacked under
1428         sml.boot.x86-win32.
1429         The script is very primitive and does a poor job at error checking.
1430         It only installs the base system, ml-lex, and ml-yacc.  No other
1431         libraries are being installed (i.e., you get only those that
1432         are part of the compiler.)
1433       - link-sml.bat:  analogous to .link-sml, but not currently used
1434    
1435    Unrelated bug fixes:
1436    
1437      - ml-nlffigen now exports structures ST_* corresponding to incomplete
1438        types.
1439      - Added getDevice to PP/src/pp-debug-fn.sml.  (Would not compile
1440        otherwise.)
1441    
1442    ----------------------------------------------------------------------
1443    Name: Dave MacQueen (macqueen@cs.uchicago.edu)
1444    Date: 2003/06/17
1445    Tag: macqueen-20030617-bug895
1446    Description:
1447    
1448    Modified compiler/Elaborator/print/pptype.sml to fix bug 895.
1449    Tag will be used for new development branch (mcz-branch) for
1450    use by MacQueen, (Lucasz) Zairek, and (George) Cao at uchicago.
1451    
1452    ----------------------------------------------------------------------
1453    Name: Matthias Blume (blume (at) tti - c (dot) org)
1454    Date: 2003/05/27 16:55:00 CDT
1455    Tag: blume-20030527-polyeq
1456    Description:
1457    
1458    Tried to eliminated most cases of polymorphic equality.
1459    
1460    ----------------------------------------------------------------------
1461    Name: Matthias Blume (blume (at) tti - c (dot) org)
1462    Date: 2003/05/21 17:45:00 CDT
1463    Tag: blume-20030517-complete
1464    Description:
1465    
1466    Two changes:
1467    
1468      1. Added a flag for controlling whether non-exhaustive bindings will
1469         be treated as errors (default is false).
1470      2. Cleaned up the *entire* source tree so that CMB.make goes through
1471         without a single non-exhaustive match- or bind warning.
1472    
1473    ----------------------------------------------------------------------
1474    Name: Matthias Blume (blume (at) tti - c (dot) org)
1475    Date: 2003/05/17 10:20:00 CDT
1476    Tag: blume-20030517-absyn
1477    Description:
1478    
1479    1. Added cases for IF, WHILE, ANDALSO, and ORELSE to Absyn.
1480    
1481       This mainly affects the quality of error messages.  However, some
1482       of the code is now more straightforward than before. (Treatment of
1483       the above four constructs in translate.sml is much simpler than
1484       the "macro-expansion" that was going on before.  Plus, the mach-
1485       compiler no longer gets invoked just to be able to compile an
1486       if-expression.)
1487    
1488    2. The ErrorMsg.Error exception is now caught and absorbed by the
1489       interactive loop.
1490    
1491    ----------------------------------------------------------------------
1492    Name: Allen Leung
1493    Date: 2003/05/16 13:05:00 CDT
1494    Tag: leunga-20030516-cygwin-runtime
1495    Description:
1496    
1497        Ported the runtime system to cygwin, which uses the unix
1498    x86-unix bin files.  Missing/buggy features:
1499    
1500       o getnetbyname, getnetbyaddr: these functions seem to be missing in
1501         the Cygwin library.
1502       o Ctrl-C handling may be flaky.
1503       o Windows system calls and Windows I/O are not supported.
1504    
1505       A new set of binfiles is located at:
1506    
1507         http://www.dorsai.org/~leunga/boot.x86-unix.tgz
1508    
1509       This is only needed for bootstrapping the cygwin version of smlnj.
1510       Other x86 versions can use the existing binfiles.
1511    
1512    ----------------------------------------------------------------------
1513    Name: Matthias Blume
1514    Date: 2003/04/08 15:42:00 CDT
1515    Tag: blume-20030408-listpair
1516    Description:
1517    
1518    1. Added a target 'mlrisc' to installer.
1519    
1520    2. Added missing elements to structure ListPair.
1521    
1522    ----------------------------------------------------------------------
1523    Name: Allen Leung
1524    Date: 2003/01/07 10:40:00 EST
1525    Tag: leunga-20030107-int-rem
1526    Description:
1527    
1528    Fixed a bug in Int.rem(x,y) where y is a power of 2 on x86.
1529    The arguments to the SUBL instruction were swapped.
1530    
1531    ----------------------------------------------------------------------
1532    Name: Matthias Blume
1533    Date: 2002/12/12 16:25:00 EST
1534    Tag: blume-20021212-risc-ra
1535    Description:
1536    
1537    Fixed a serious bug in the rewrite code for FP spilling/reloading that
1538    sent the RA into an infinite loop when floating point registers get
1539    spilled.  (Because of this bug, e.g., nucleic stopped compiling between
1540    110.37 and 110.38.)
1541    There was another set of potential problems related to the handling of
1542    MLRISC annotations (but those did not yet cause real problems, apparently).
1543    
1544    ----------------------------------------------------------------------
1545    Name: Matthias Blume
1546    Date: 2002/12/06 22:40:00 EST
1547    Tag: blume-20021206-cm-fileid
1548    Description:
1549    
1550    Added a call of SrcPath.sync at the beginning of Parse.parse (in CM).
1551    This fixes the problem of CM getting confused by files that suddenly
1552    change their identity (e.g., by getting unlinked and recreated by some
1553    text editor such as vi).  There might be a better/cheaper/cleaner way
1554    of doing this, but for now this will have to do.
1555    
1556    ----------------------------------------------------------------------
1557    Name: Matthias Blume
1558    Date: 2002/10/28 09:50:00 EST
1559    Tag: blume-20021028-typecheck
1560    Description:
1561    
1562    Exported structure Typecheck from $smlnj/viscomp/core.cm.
1563    
1564    ----------------------------------------------------------------------
1565    Name: Matthias Blume
1566    Date: 2002/10/17 09:10:00 EDT
1567    Tag: Release_110_42
1568    Description:
1569    
1570    In good old tradition, there has been a slight hiccup so that we have
1571    to patch 110.42 after the fact.   The old release tag has been replaced
1572    (see below).
1573    
1574    The change solves a problem with two competing approaches the
1575    configuration problem regarding MacOS 10.1 vs. MacOS 10.2 which got in
1576    each other's way.
1577    
1578    This change only affects the runtime system code and the installer script.
1579    (No new bootfiles.)
1580    
1581    ----------------------------------------------------------------------
1582    Name: Matthias Blume
1583    Date: 2002/10/16 12:00:00 EDT
1584    Tag: Release_110_42_removed
1585    Description:
1586    
1587    New working release.  New bootfiles.
1588    
1589    ----------------------------------------------------------------------
1590    Name: Matthias Blume
1591    Date: 2002/10/10 13:10:00 EDT
1592    Tag: blume-20021010-ppc-divs
1593    Description:
1594    
1595    The mltree operator DIVS must be implemented with an overflow check on
1596    the PPC because the hardware indicates divide-by-zero using "overflow" as
1597    well.
1598    
1599    ----------------------------------------------------------------------
1600    Name: Matthias Blume
1601    Date: 2002/07/23 11:45:00
1602    Tag: blume-20020723-smlnj-home
1603    Description:
1604    
1605    Sml now senses the SMLNJ_HOME environment variable.  If this is set,
1606    then the bin dir is assumed to be in $SMLNJ_HOME/bin and (unless
1607    CM_PATHCONFIG is also set), the path configuration file is assumed
1608    to be in $SMLNJ_HOME/lib/pathconfig.  This way one can easily move
1609    the entire tree to some other place and everything will "just work".
1610    
1611    (Companion commands such as ml-build and ml-makedepend also sense this
1612    variable.)
1613    
1614    ----------------------------------------------------------------------
1615    Name: Matthias Blume
1616    Date: 2002/07/12 21:19:00 EDT
1617    Tag: blume-20020712-liveness
1618    Description:
1619    
1620    Exported two useful "step" functions from liveness module (MLRISC).
1621    
1622    ----------------------------------------------------------------------
1623    Name: Matthias Blume
1624    Date: 2002/07/05 16:00 EDT
1625    Tag: Release_110_41
1626    Description:
1627    
1628    New working release.  New bootfiles.
1629    
1630    ----------------------------------------------------------------------
1631    Name: Matthias Blume
1632    Date: 2002/07/05 10:25:00 EDT
1633    Tag: blume-20020705-btimp
1634    Description:
1635    
1636    Exported structure BTImp from $smlnj/viscomp/debugprof.cm so that
1637    other clients can set up backtracing support.
1638    
1639    ----------------------------------------------------------------------
1640    Name: Matthias Blume
1641    Date: 2002/06/25 17:23:00 EDT
1642    Tag: blume-20020625-fpmax
1643    Description:
1644    
1645    Fixed a bug in translation of INLMAX (and INLMIN) for the floating-point
1646    case.  (The sense of the isNaN test was reversed -- which made min and
1647    max always return their first argument.)
1648    
1649    ----------------------------------------------------------------------
1650    Name: Matthias Blume
1651    Date: 2002/06/11
1652    Tag: blume-20020611-unixpath
1653    Description:
1654    
1655    Back-ported OS.Path.{from,to}UnixPath from idlbasis-devel branch.
1656    
1657    ----------------------------------------------------------------------
1658    Name: Matthias Blume
1659    Date: 2002/06/10 16:35:00 EDT
1660    Tag: blume-20020610-ieeereal
1661    Description:
1662    
1663    I back-ported my implementation of IEEEReal.fromString from the
1664    idlbasis-devel branch so that we can test it.
1665    
1666    Another small change is that ppDec tries to give more information
1667    than just "<sig>" in the case of functors.  However, this code is
1668    broken in some mysterious way if the functor's body's signature
1669    has not been declared by ascription but gets inferred from the
1670    implementation.  This needs fixing...
1671    
1672    ----------------------------------------------------------------------
1673    Name: Matthias Blume
1674    Date: 2002/05/31
1675    Tag: blume-20020531-btrace-mode
1676    Description:
1677    
1678    Resurrected SMLofNJ.Internals.BTrace.mode.  (It accidentally fell by
1679    the wayside when I switched over to using Controls everywhere.)
1680    
1681    ----------------------------------------------------------------------
1682    Name: Lal George
1683    Date: 2002/05/23 12:21:40 EDT
1684    Tag: george-20020523-visual-labels
1685    Description:
1686    
1687    Labels are now displayed in the graphical output to make
1688    the fall-through and target blocks obvious.
1689    
1690    ----------------------------------------------------------------------
1691    Name: Matthias Blume
1692    Date: 2002/05/22 11:03:00 EDT
1693    Tag: blume-20020522-shrink
1694    Description:
1695    
1696    John tweaked yesterday's fix for 1131 to handle an out-of-memory
1697    situation that comes up when allocating huge arrays.
1698    
1699    ----------------------------------------------------------------------
1700    Name: Matthias Blume
1701    Date: 2002/05/21 16:00:00 EDT
1702    Tag: Release_110_40
1703    Description:
1704    
1705    New working release (110.40).  New bootfiles.
1706    
1707    [Also: John Reppy fixed GC bug 1131.]
1708    
1709    ----------------------------------------------------------------------
1710    Name: Matthias Blume
1711    Date: 2002/05/21 12:35:00 EDT
1712    Tag: blume-20020521-cmdoc
1713    Description:
1714    
1715    CM documentation update.
1716    
1717    ----------------------------------------------------------------------
1718    Name: Matthias Blume
1719    Date: 2002/05/21 10:55:00 EDT
1720    Tag: blume-20020521-misc
1721    Description:
1722    
1723    - John tweaked runtime to be silent on heap export (except when
1724      GC messages are on).
1725    - I added a few more things (cross-compiling versions of CMB) to
1726      config/preloads (as suggestions).
1727    
1728    ----------------------------------------------------------------------
1729    Name: Matthias Blume
1730    Date: 2002/05/20 22:25:00 EDT
1731    Tag: blume-20020520-controls
1732    Description:
1733    
1734    - Added ControlUtil structure to control-lib.cm.
1735    - Use it throughout.
1736    - Used Controls facility to define MLRISC controls (as opposed to
1737      registering MLRISC control ref cells with Controls after the fact)
1738    - Fixed messed-up controls priorities.
1739    
1740    * Removed again all the stuff from config/preloads that one wouldn't
1741      be able to preload at the time the initial heap image is built.
1742      (Many libraries, e.g., CML, do not exist yet at this time.  The
1743       only libraries that can be preloaded via config/preloads are those
1744       that come bundled with the bootfiles.)
1745    
1746    ----------------------------------------------------------------------
1747    Name: Matthias Blume
1748    Date: 2002/05/20 10:59:00 EDT
1749    Tag: blume-20020520-preloads
1750    Description:
1751    
1752    Added a lot of commented-out suggestions for things to be included
1753    in config/preloads.
1754    
1755    ----------------------------------------------------------------------
1756    Name: Allen Leung
1757    Date: 2002/05/18 14:20:00 EDT
1758    Tag: leunga-20020518-mdl
1759    Description:
1760    
1761    o Made the mdl tool stuff compile and run again.
1762    o I've disabled all the stuff that depends on RTL specifications; they
1763      are all badly broken anyway.
1764    
1765    ----------------------------------------------------------------------
1766    Name: Matthias Blume
1767    Date: 2002/05/17 16:49:00 EDT
1768    Tag: blume-20020517-controls
1769    Description:
1770    
1771    0. John Reppy made several modifications to the SML/NJ library.
1772       In particular, there is a shiny new controls-lib.cm.
1773    
1774    1. Pushed new controls interface through compiler so that everything
1775       compiles again.
1776    
1777    2. Added FormatComb and FORMAT_COMB to the CML version of the
1778       SML/NJ library (so that CML compiles again).
1779    
1780    3. Modified init scripts because XXX_DEFAULT environment variables
1781       are no longer with us.  (Boot-time initialization is now done
1782       using the same environment variables that are also used for
1783       startup-time initialization of controls.)
1784    
1785    ----------------------------------------------------------------------
1786    Name: Lal George
1787    Date: 2002/05/15 09:20:10 EDT
1788    Tag: george-20020515-pseudo-op-decls
1789    Description:
1790    
1791            All pseudo-ops emitted before the first segment declaration
1792    such as TEXT, DATA, and BSS directives are assumed to be global
1793    declarations and are emitted first in the assembly file. This is
1794    useful in a number of situations where one has pseudo-ops that are not
1795    specific to any segment, and also works around the constraint that one
1796    cannot have client pseudo-ops in the TEXT segment.
1797    
1798            Because no segment is associated with these declarations it is
1799    an error to allocate any space or objects before the first segment
1800    directive and an exception will be raised. However, we cannot make
1801    this check for client pseudo-ops.
1802    
1803            These top level declarations are a field in the CFG graph_info.
1804    In theory you can continue to add to this field after the CFG has been
1805    built -- provided you know what you are doing;-)
1806    
1807    ----------------------------------------------------------------------
1808    Name: Matthias Blume
1809    Date: 2002/05/13 16:40:00 EDT
1810    Tag: blume-20020513-pp-etc
1811    Description:
1812    
1813    A few minor bugfixes:
1814    
1815      - Stopgap measure for bug recently reported by Elsa Gunter (ppDec).
1816        (Bogus printouts for redefined bindings still occur.  Compiler
1817        bug should no longer occur now.  We need to redo the prettyprinter
1818        from scratch.)
1819    
1820      - CM pathname printer now also adds escape sequences for ( and )
1821    
1822      - commend and docu fixes for ml-nlffi
1823    
1824    ----------------------------------------------------------------------
1825    Name: Matthias Blume
1826    Date: 2002/05/10 16:40:00 EDT
1827    Tag: blume-20020510-erg-textio
1828    Description:
1829    
1830    Applied the following bugfix provided by Emden Gansner:
1831    
1832        Output is corrupted when outputSubstr is used rather than output.
1833    
1834        The problem occurs when a substring
1835    
1836            ss = (s, dataStart, dataLen)
1837    
1838        where dataStart > 0, fills a stream buffer with avail bytes left.
1839        avail bytes of s, starting at index dataStart, are copied into the
1840        buffer, the buffer is flushed, and then the remaining dataLen-avail
1841        bytes of ss are copied into the beginning of the buffer. Instead of
1842        starting this copy at index dataStart+avail in s, the current code
1843        starts the copy at index avail.
1844    
1845        Fix:
1846        In text-io-fn.sml, change line 695 from
1847             val needsFlush = copyVec(v, avail, dataLen-avail, buf, 0)
1848        to
1849             val needsFlush = copyVec(v, dataStart+avail, dataLen-avail, buf, 0)
1850    
1851    ----------------------------------------------------------------------
1852    Name: Matthias Blume
1853    Date: 2002/04/12 13:55:00 EDT
1854    Tag: blume-20020412-assyntax
1855    Description:
1856    
1857    1. Grabbed newer assyntax.h from the XFree86 project.
1858    2. Fiddled with how to compile X86.prim.asm without warnings.
1859    3. (Very) Minor cleanup in CM.
1860    
1861    ----------------------------------------------------------------------
1862    Name: Matthias Blume
1863    Date: 2002/04/01 (no joke!) 17:07:00 EST
1864    Tag: blume-20020401-x86div
1865    Description:
1866    
1867    Added full support for div/mod/rem/quot on the x86, using the machine
1868    instruction's two results (without clumsily recomputing the remainder)
1869    directly where appropriate.
1870    
1871    Some more extensive power-of-two support was added to the x86 instruction
1872    selector (avoiding expensive divs, mods, and muls where they can be
1873    replaced with cheaper shifts and masks).  However, this sort of thing
1874    ought to be done earlier, e.g., within the CPS optimizer so that
1875    all architectures benefit from it.
1876    
1877    The compiler compiles to a fixed point, but changes might be somewhat
1878    fragile nevertheless.  Please, report any strange things that you might
1879    see wrt. div/mod/quot/rem...
1880    
1881    ----------------------------------------------------------------------
1882    Name: Matthias Blume
1883    Date: 2002/03/29 17:22:00
1884    Tag: blume-20020329-div
1885    Description:
1886    
1887    Fixed my broken div/mod logic.  Unfortunately, this means that the
1888    inline code for div/mod now has one more comparison than before.
1889    Fast paths (quotient > 0 or remainder = 0) are not affected, though.
1890    The problem was with quotient = 0, because that alone does not tell
1891    us which way the rounding went.  One then has to look at whether
1892    remainder and divisor have the same sign...  :(
1893    
1894    Anyway, I replaced the bootfiles with fresh ones...
1895    
1896    ----------------------------------------------------------------------
1897    Name: Matthias Blume
1898    Date: 2002/03/29 14:10:00 EST
1899    Tag: blume-20020329-inlprims
1900    Description:
1901    
1902    NEW BOOTFILES!!!    Version number bumped to 110.39.3.
1903    
1904    Primops have changed. This means that the bin/boot-file formats have
1905    changed as well.
1906    
1907    To make sure that there is no confusion, I made a new version.
1908    
1909    
1910    CHANGES:
1911    
1912    * removed REMT from mltree (remainder should never overflow).
1913    
1914    * added primops to deal with divisions of all flavors to the frontend
1915    
1916    * handled these primops all the way through so they map to their respective
1917      MLRISC support
1918    
1919    * used these primops in the implementation of Int, Int32, Word, Word32
1920    
1921    * removed INLDIV, INLMOD, and INLREM as they are no longer necessary
1922    
1923    * parameterized INLMIN, INLMAX, and INLABS by a numkind
1924    
1925    * translate.sml now deals with all flavors of INL{MIN,MAX,ABS}, including
1926      floating point
1927    
1928    * used INL{MIN,MAX,ABS} in the implementation of Int, Int32, Word, Word32,
1929      and Real (but Real.abs maps to a separate floating-point-only primop)
1930    
1931    
1932    TODO items:
1933    
1934    * Hacked Alpha32 instruction selection, disabling the selection of REMx
1935      instructions because the machine instruction encoder cannot handle
1936      them.  (Hppa, PPC, and Sparc instruction selection did not handle
1937      REM in the first place, and REM is supported by the x86 machine coder.)
1938    
1939    * Handle DIV and MOD with DIV_TO_NEGINF directly in the x86 instruction
1940      selection phase.  (The two can be streamlined because the hardware
1941      delivers both quotient and remainder at the same time anyway.)
1942    
1943    * Think about what to do with "valOf(Int32.minInt) div ~1" and friends.
1944      (Currently the behavior is inconsistent both across architectures and
1945      wrt. the draft Basis spec.)
1946    
1947    * Word8 should eventually be handled natively, too.
1948    
1949    * There seems to be one serious bug in mltree-gen.sml.  It appears, though,
1950      as if there currently is no execution path that could trigger it in
1951      SML/NJ.  (The assumptions underlying functions arith and promotable do not
1952      hold for things like multiplication and division.)
1953    
1954    ----------------------------------------------------------------------
1955    Name: Matthias Blume
1956    Date: 2002/03/27 16:27:00 EST
1957    Tag: blume-20020327-mlrisc-divisions
1958    Description:
1959    
1960    Added support for all four division operations (ML's div, mod, quot,
1961    and rem) to MLRISC.  In the course of doing so, I also rationalized
1962    the naming (no more annoying switch-around of DIV and QUOT), by
1963    parameterizing the operation by div_rounding_mode (which can be either
1964    DIV_TO_ZERO or DIV_TO_NEGINF).
1965    
1966    The generic MLTreeGen functor takes care of compiling all four
1967    operations down to only round-to-zero div.
1968    
1969    Missing pieces:
1970    
1971      * Doing something smarter than relying on MLTreeGen on architectures
1972        like, e.g., the x86 where hardware division delivers both quotient and
1973        remainder at the same time.  With this, the implementation of the
1974        round-to-neginf operations could be further streamlined.
1975    
1976      * Remove inlining support for div/mod/rem from the frontend and replace it
1977        with primops that get carried through to the backend.  Do this for all
1978        int and word types.
1979    
1980    ----------------------------------------------------------------------
1981    Name: Matthias Blume
1982    Date: 2002/03/25 17:25:00 EST
1983    Tag: blume-20020325-divmod
1984    Description:
1985    
1986    I improved (hopefully without breaking them) the implementation of Int.div,
1987    Int.mod, and Int.rem.   For this, the code in translate.sml now takes
1988    advantage of the following observations:
1989    
1990      Let  q = x quot y      r = x rem y
1991           d = x div  y      m = x mod y
1992    
1993    where "quot" is the round-to-zero version of integer division that
1994    hardware usually provides.  Then we have:
1995    
1996         r = x - q * y        where neither the * nor the - will overflow
1997         d = if q >= 0 orelse x = q * y then q else q - 1
1998                              where neither the * nor the - will overflow
1999         m = if q >= 0 orelse r = 0 then r else r + y
2000                              where the + will not overflow
2001    
2002    This results in substantial simplification of the generated code.
2003    The following table shows the number of CFG nodes and edges generated
2004    for
2005            fun f (x, y) = x OPER y
2006            (* with OPER \in div, mod, quot, rem *)
2007    
2008    
2009        OPER | nodes(old) | edges(old) | nodes(new) | edges(new)
2010        --------------------------------------------------------
2011         div |         24 |         39 |         12 |         16
2012         mod |         41 |         71 |         12 |         16
2013        quot |          8 |         10 |          8 |         10
2014         rem |         10 |         14 |          8 |         10
2015    
2016    
2017    ----------------------------------------------------------------------
2018    Name: Matthias Blume
2019    Date: 2002/03/25 22:06:00 EST
2020    Tag: blume-20020325-cprotobug
2021    Description:
2022    
2023    Fixed a bug in cproto (c prototype decoder).
2024    
2025    ----------------------------------------------------------------------
2026    Name: Matthias Blume
2027    Date: 2002/03/25 16:00:00 EST
2028    Tag: blume-20020325-raw-primops
2029    Description:
2030    
2031    I did some cleanup to Allen's new primop code and
2032    replaced yesterday's bootfiles with new ones.
2033    (But they are stored in the same place.)
2034    
2035    ----------------------------------------------------------------------
2036    Name: Matthias Blume
2037    Date: 2002/03/24 22:40:00 EST
2038    Tag: blume-20020324-bootfiles
2039    Description:
2040    
2041    Made the bootfiles that Allen asked for.
2042    
2043    ----------------------------------------------------------------------
2044    Name: Allen Leung
2045    Date: 2002/03/23 15:50:00 EST
2046    Tag: leunga-20020323-flint-cps-rcc-primops
2047    Description:
2048    
2049      1. Changes to FLINT primops:
2050    
2051        (* make a call to a C-function;
2052         * The primop carries C function prototype information and specifies
2053         * which of its (ML-) arguments are floating point. C prototype
2054         * information is for use by the backend, ML information is for
2055         * use by the CPS converter. *)
2056      | RAW_CCALL of { c_proto: CTypes.c_proto,
2057                       ml_args: ccall_type list,
2058                       ml_res_opt: ccall_type option,
2059                       reentrant : bool
2060                     } option
2061       (* Allocate uninitialized storage on the heap.
2062        * The record is meant to hold short-lived C objects, i.e., they
2063        * are not ML pointers.  With the tag, the representation is
2064        * the same as RECORD with tag tag_raw32 (sz=4), or tag_fblock (sz=8)
2065        *)
2066      | RAW_RECORD of {tag:bool,sz:int}
2067      and ccall_type = CCALL_INT32 | CCALL_REAL64 | CCALL_ML_PTR
2068    
2069      2.  These CPS primops are now overloaded:
2070    
2071           rawload of {kind:numkind}
2072           rawstore of {kind:numkind}
2073    
2074          The one argument form is:
2075    
2076             rawload {kind} address
2077    
2078          The two argument form is:
2079    
2080             rawload {kind} [ml object, byte-offset]
2081    
2082      3. RAW_CCALL/RCC now takes two extra arguments:
2083    
2084         a. The first is whether the C call is reentrant, i.e., whether
2085            ML state should be saved and restored.
2086         b. The second argument is a string argument specifying the name of
2087            library and the C function.
2088    
2089         These things are currently not handled in the code generator, yet.
2090    
2091      4. In CProto,
2092    
2093         An encoding type of "bool" means "ml object" and is mapped into
2094         C prototype of PTR.  Note that "bool" is different than "string",
2095         even though "string" is also mapped into PTR, because "bool"
2096         is assigned an CPS type of BOGt, while "string" is assigned INT32t.
2097    
2098      5. Pickler/unpicker
2099    
2100         Changed to handle RAW_RECORD and newest RAW_CCALL
2101    
2102      6. MLRiscGen,
2103    
2104         1. Changed to handle the new rawload/rawstore/rawrecord operators.
2105         2. Code for handling C Calls has been moved to a new module CPSCCalls,
2106            in the file CodeGen/cpscompile/cps-c-calls.sml
2107    
2108      7. Added the conditional move operator
2109    
2110             condmove of branch
2111    
2112         to cps.  Generation of this is still buggy so it is currently
2113         disabled.
2114    
2115    ----------------------------------------------------------------------
2116    Name: Lal George
2117    Date: 2002/03/22 14:18:25 EST
2118    Tag: george-20020322-cps-branch-prob
2119    Description:
2120    
2121    Implemented the Ball-Larus branch prediction-heuristics, and
2122    incorporated graphical viewers for control flow graphs.
2123    
2124    Ball-Larus Heuristics:
2125    ---------------------
2126    See the file compiler/CodeGen/cpscompile/cpsBranchProb.sml.
2127    
2128    By design it uses the Dempster-Shafer theory for combining
2129    probabilities.  For example, in the function:
2130    
2131        fun f(n,acc) = if n = 0 then acc else f(n-1, n*acc)
2132    
2133    the ball-larus heuristics predicts that the n=0 is unlikely
2134    (OH-heuristic), and the 'then' branch is unlikely because of the
2135    RH-heuristic -- giving the 'then' branch an even lower combined
2136    probability using the Dempster-Shafer theory.
2137    
2138    Finally, John Reppy's loop analysis in MLRISC, further lowers the
2139    probability of the 'then' branch because of the loop in the else
2140    branch.
2141    
2142    
2143    Graphical Viewing:
2144    ------------------
2145    I merely plugged in Allen's graphical viewers into the compiler. The
2146    additional code is not much. At the top level, saying:
2147    
2148            Control.MLRISC.getFlag "cfg-graphical-view" := true;
2149    
2150    will display the graphical view of the control flow graph just before
2151    back-patching.  daVinci must be in your path for this to work. If
2152    daVinci is not available, then the default viewer can be changed
2153    using:
2154    
2155            Control.MLRISC.getString "viewer"
2156    
2157    which can be set to "dot" or "vcg" for the corresponding viewers. Of
2158    course, these viewers must be in your path.
2159    
2160    The above will display the compilation unit at the level of clusters,
2161    many of which are small, boring, and un-interesting. Also setting:
2162    
2163            Control.MLRISC.getInt "cfg-graphical-view_size"
2164    
2165    will display clusters that are larger than the value set by the above.
2166    
2167    
2168    ----------------------------------------------------------------------
2169    Name: Matthias Blume
2170    Date: 2002/03/21 22:20:00 EST
2171    Tag: blume-20020321-kmp-bugfix
2172    Description:
2173    
2174    Changed the interface to the KMP routine in PreString and fixed
2175    a minor bug in one place where it was used.
2176    
2177    ----------------------------------------------------------------------
2178    Name: Allen Leung
2179    Date: 2002/03/21 20:30:00 EST
2180    Tag: leunga-20020321-cfg
2181    Description:
2182    
2183      Fixed a potential problem in cfg edge splitting.
2184    
2185    ----------------------------------------------------------------------
2186    Name: Allen Leung
2187    Date: 2002/03/21 17:15:00 EST
2188    Tag: leunga-20020321-x86-fp-cfg
2189    Description:
2190    
2191      1. Recoded the buggy parts of x86-fp.
2192    
2193         a. All the block reordering code has been removed.
2194            We now depend on the block placement phases to do this work.
2195    
2196         b. Critical edge splitting code has been simplified and moved into the
2197            CFG modules, as where they belong.
2198    
2199         Both of these were quite buggy and complex.  The code is now much, much
2200         simpler.
2201    
2202      2. X86 backend.
2203    
2204         a. Added instructions for 64-bit support.  Instruction selection for
2205            64-bit has not been committed, however, since that
2206            requires changes to MLTREE which haven't been approved by
2207            Lal and John.
2208    
2209         b. Added support for FUCOMI and FUCOMIP when generating code for
2210            PentiumPro and above.  We only generate these instructions in
2211            the fast-fp mode.
2212    
2213         c. Added cases for JP and JNP in X86FreqProps.
2214    
2215      3. CFG
2216    
2217         CFG now has a bunch of methods for edge splitting and merging.
2218    
2219      4. Machine description.
2220    
2221         John's simplification of MLTREE_BASIS.fcond broke a few machine
2222         description things:
2223    
2224         rtl-build.{sig,sml} and hppa.mdl fixed.
2225    
2226         NOTE: the machine description stuff in the repository is still broken.
2227               Again, I can't put my fixes in because that involves
2228               changes to MLTREE.
2229    
2230    ----------------------------------------------------------------------
2231    Name: Matthias Blume
2232    Date: 2002/03/20 15:55:00 EST
2233    Tag: blume-20020320-kmp
2234    Description:
2235    
2236    Implemented Knuth-Morris-Pratt string matching in PreString and used
2237    it for String.isSubstring, Substring.isSubstring, and
2238    Substring.position.
2239    
2240    (Might need some stress-testing.  Simple examples worked fine.)
2241    
2242    ----------------------------------------------------------------------
2243    Name: Matthias Blume
2244    Date: 2002/03/19 16:37:00 EST
2245    Tag: blume-20020319-witnesses
2246    Description:
2247    
2248    Added a structure C.W and functions convert/Ptr.convert to ml-nlffi-lib.
2249    
2250    This implements a generic mechanism for changing constness qualifiers
2251    anywhere within big C types without resorting to outright "casts".
2252    (So far, functions such as C.rw/C.ro or C.Ptr.rw/C.Ptr.ro only let you
2253    modify the constness at the outermost level.)
2254    The implementation of "convert" is based on the idea of "witness"
2255    values -- values that are not used by the operation but whose types
2256    "testify" to their applicability.  On the implementation side, "convert"
2257    is simply a projection (returning its second curried argument).  With
2258    cross-module inlining, it should not result in any machine code being
2259    generated.
2260    
2261    ----------------------------------------------------------------------
2262    Name: Matthias Blume
2263    Date: 2002/03/15 16:40:00 EST
2264    Tag: blume-20020315-basis
2265    Description:
2266    
2267    Provided (preliminary?) implementations for
2268    
2269      {String,Substring}.{concatWith,isSuffix,isSubstring}
2270    
2271    and
2272    
2273      Substring.full
2274    
2275    Those are in the Basis spec but they were missing in SML/NJ.
2276    
2277    ----------------------------------------------------------------------
2278  Name: Matthias Blume  Name: Matthias Blume
2279  Date: 2002/03/14 21:30:00 EST  Date: 2002/03/14 21:30:00 EST
2280  Tag: blume-20020314-controls  Tag: blume-20020314-controls

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