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revision 1055, Thu Feb 7 20:38:59 2002 UTC revision 1126, Thu Mar 7 21:16:28 2002 UTC
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13  Description:  Description:
14    
15  ----------------------------------------------------------------------  ----------------------------------------------------------------------
16    Name: Matthias Blume
17    Date: 2002/03/07 16:15:00 EST
18    Tag: blume-20020307-controls
19    Description:
20    
21    This is a very large but mostly boring patch which makes (almost)
22    every tuneable compiler knob (i.e., pretty much everything under
23    Control.* plus a few other things) configurable via both the command
24    line and environment variables in the style CM did its configuration
25    until now.
26    
27    Try starting sml with '-h' (or, if you are brave, '-H')
28    
29    To this end, I added a structure Controls : CONTROLS to smlnj-lib.cm which
30    implements the underlying generic mechanism.
31    
32    The interface to some of the existing such facilities has changed somewhat.
33    For example, the MLRiscControl module now provides mkFoo instead of getFoo.
34    (The getFoo interface is still there for backward-compatibility, but its
35    use is deprecated.)
36    
37    The ml-build script passes -Cxxx=yyy command-line arguments through so
38    that one can now twiddle the compiler settings when using this "batch"
39    compiler.
40    
41    TODO items:
42    
43    We should go through and throw out all controls that are no longer
44    connected to anything.  Moreover, we should go through and provide
45    meaningful (and correct!) documentation strings for those controls
46    that still are connected.
47    
48    Currently, multiple calls to Controls.new are accepted (only the first
49    has any effect).  Eventually we should make sure that every control
50    is being made (via Controls.new) exactly once.  Future access can then
51    be done using Controls.acc.
52    
53    Finally, it would probably be a good idea to use the getter-setter
54    interface to controls rather than ref cells.  For the time being, both
55    styles are provided by the Controls module, but getter-setter pairs are
56    better if thread-safety is of any concern because they can be wrapped.
57    
58    *****************************************
59    
60    One bug fix: The function blockPlacement in three of the MLRISC
61    backpatch files used to be hard-wired to one of two possibilities at
62    link time (according to the value of the placementFlag).  But (I
63    think) it should rather sense the flag every time.
64    
65    *****************************************
66    
67    Other assorted changes (by other people who did not supply a HISTORY entry):
68    
69    1. the cross-module inliner now works much better (Monnier)
70    2. representation of weights, frequencies, and probabilities in MLRISC
71       changed in preparation of using those for weighted block placement
72       (Reppy, George)
73    
74    ----------------------------------------------------------------------
75    Name: Lal George
76    Date: 2002/03/07 14:44:24 EST 2002
77    Tag: george-20020307-weighted-block-placement
78    
79    Tested the weighted block placement optimization on all architectures
80    (except the hppa) using AMPL to generate the block and edge frequencies.
81    Changes were required in the machine properties to correctly
82    categorize trap instructions. There is an MLRISC flag
83    "weighted-block-placement" that can be used to enable weighted block
84    placement, but this will be ineffective without block/edge
85    frequencies (coming soon).
86    
87    
88    ----------------------------------------------------------------------
89    Name: Lal George
90    Date: 2002/03/05 17:24:48 EST
91    Tag: george-20020305-linkage-cluster
92    
93    In order to support the block placement optimization, a new cluster
94    is generated as the very first cluster (called the linkage cluster).
95    It contains a single jump to the 'real' entry point for the compilation
96    unit. Block placement has no effect on the linkage cluster itself, but
97    all the other clusters  have full freedom in the manner in which they
98    reorder blocks or functions.
99    
100    On the x86 the typical linkage code that is generated is:
101       ----------------------
102            .align 2
103       L0:
104            addl    $L1-L0, 72(%esp)
105            jmp     L1
106    
107    
108            .align  2
109       L1:
110       ----------------------
111    
112    72(%esp) is the memory location for the stdlink register. This
113    must contain the address of the CPS function being called. In the
114    above example, it contains the address of  L0; before
115    calling L1 (the real entry point for the compilation unit), it
116    must contain the address for L1, and hence
117    
118            addl $L1-L0, 72(%esp)
119    
120    I have tested this on all architectures except the hppa.The increase
121    in code size is of course negligible
122    
123    ----------------------------------------------------------------------
124    Name: Allen Leung
125    Date: 2002/03/03 13:20:00 EST
126    Tag: leunga-20020303-mlrisc-tools
127    
128      Added #[ ... ] expressions to mlrisc tools
129    
130    ----------------------------------------------------------------------
131    Name: Matthias Blume
132    Date: 2002/02/27 12:29:00 EST
133    Tag: blume-20020227-cdebug
134    Description:
135    
136    - made types in structure C and C_Debug to be equal
137    - got rid of code duplication (c-int.sml vs. c-int-debug.sml)
138    - there no longer is a C_Int_Debug (C_Debug is directly derived from C)
139    
140    ----------------------------------------------------------------------
141    Name: Matthias Blume
142    Date: 2002/02/26 12:00:00 EST
143    Tag: blume-20020226-ffi
144    Description:
145    
146    1. Fixed a minor bug in CM's "noweb" tool:
147       If numbering is turned off, then truly don't number (i.e., do not
148       supply the -L option to noweb).  The previous behavior was to supply
149       -L'' -- which caused noweb to use the "default" line numbering scheme.
150       Thanks to Chris Richards for pointing this out (and supplying the fix).
151    
152    2. Once again, I reworked some aspects of the FFI:
153    
154       A. The incomplete/complete type business:
155    
156       - Signatures POINTER_TO_INCOMPLETE_TYPE and accompanying functors are
157         gone!
158       - ML types representing an incomplete type are now *equal* to
159         ML types representing their corresponding complete types (just like
160         in C).  This is still safe because ml-nlffigen will not generate
161         RTTI for incomplete types, nor will it generate functions that
162         require access to such RTTI.   But when ML code generated from both
163         incomplete and complete versions of the C type meet, the ML types
164         are trivially interoperable.
165    
166         NOTE:  These changes restore the full generality of the translation
167         (which was previously lost when I eliminated functorization)!
168    
169       B. Enum types:
170    
171       - Structure C now has a type constructor "enum" that is similar to
172         how the "su" constructor works.  However, "enum" is not a phantom
173         type because each "T enum" has values (and is isomorphic to
174         MLRep.Signed.int).
175       - There are generic access operations for enum objects (using
176         MLRep.Signed.int).
177       - ml-nlffigen will generate a structure E_foo for each "enum foo".
178         * The structure contains the definition of type "mlrep" (the ML-side
179         representation type of the enum).  Normally, mlrep is the same
180         as "MLRep.Signed.int", but if ml-nlffigen was invoked with "-ec",
181         then mlrep will be defined as a datatype -- thus facilitating
182         pattern matching on mlrep values.
183         ("-ec" will be suppressed if there are duplicate values in an
184          enumeration.)
185         * Constructors ("-ec") or values (no "-ec") e_xxx of type mlrep
186         will be generated for each C enum constant xxx.
187         * Conversion functions m2i and i2m convert between mlrep and
188         MLRep.Signed.int.  (Without "-ec", these functions are identities.)
189         * Coversion functions c and ml convert between mlrep and "tag enum".
190         * Access functions (get/set) fetch and store mlrep values.
191       - By default (unless ml-nlffigen was invoked with "-nocollect"), unnamed
192         enumerations are merged into one single enumeration represented by
193         structure E_'.
194    
195    ----------------------------------------------------------------------
196    Name: Allen Leung
197    Date: 2002/02/25 04:45:00 EST
198    Tag: leunga-20020225-cps-spill
199    
200    This is a new implementation of the CPS spill phase.
201    The new phase is in the new file compiler/CodeGen/cpscompile/spill-new.sml
202    In case of problems, replace it with the old file spill.sml
203    
204    The current compiler runs into some serious performance problems when
205    constructing a large record.  This can happen when we try to compile a
206    structure with many items.  Even a very simple structure like the following
207    makes the compiler slow down.
208    
209        structure Foo = struct
210           val x_1 = 0w1 : Word32.int
211           val x_2 = 0w2 : Word32.int
212           val x_3 = 0w3 : Word32.int
213           ...
214           val x_N = 0wN : Word32.int
215        end
216    
217    The following table shows the compile time, from N=1000 to N=4000,
218    with the old compiler:
219    
220    N
221    1000   CPS 100 spill                           0.04u  0.00s  0.00g
222           MLRISC ra                               0.06u  0.00s  0.05g
223              (spills = 0 reloads = 0)
224           TOTAL                                   0.63u  0.07s  0.21g
225    
226    1100   CPS 100 spill                           8.25u  0.32s  0.64g
227           MLRISC ra                               5.68u  0.59s  3.93g
228              (spills = 0 reloads = 0)
229           TOTAL                                   14.71u  0.99s  4.81g
230    
231    1500   CPS 100 spill                           58.55u  2.34s  1.74g
232           MLRISC ra                               5.54u  0.65s  3.91g
233              (spills = 543 reloads = 1082)
234           TOTAL                                   65.40u  3.13s  6.00g
235    
236    2000   CPS 100 spill                           126.69u  4.84s  3.08g
237           MLRISC ra                               0.80u  0.10s  0.55g
238              (spills = 42 reloads = 84)
239           TOTAL                                   129.42u  5.10s  4.13g
240    
241    3000   CPS 100 spill                           675.59u  19.03s  11.64g
242           MLRISC ra                               2.69u  0.27s  1.38g
243              (spills = 62 reloads = 124)
244           TOTAL                                   682.48u  19.61s  13.99g
245    
246    4000   CPS 100 spill                           2362.82u  56.28s  43.60g
247           MLRISC ra                               4.96u  0.27s  2.72g
248              (spills = 85 reloads = 170)
249           TOTAL                                   2375.26u  57.21s  48.00g
250    
251    As you can see the old cps spill module suffers from some serious
252    performance problem.  But since I cannot decipher the old code fully,
253    instead of patching the problems up, I'm reimplementing it
254    with a different algorithm.  The new code is more modular,
255    smaller when compiled, and substantially faster
256    (O(n log n) time and O(n) space).  Timing of the new spill module:
257    
258    4000  CPS 100 spill                           0.02u  0.00s  0.00g
259          MLRISC ra                               0.25u  0.02s  0.15g
260             (spills=1 reloads=3)
261          TOTAL                                   7.74u  0.34s  1.62g
262    
263    Implementation details:
264    
265    As far as I can tell, the purpose of the CPS spill module is to make sure the
266    number of live variables at any program point (the bandwidth)
267    does not exceed a certain limit, which is determined by the
268    size of the spill area.
269    
270    When the bandwidth is too large, we decrease the register pressure by
271    packing live variables into spill records.  How we achieve this is
272    completely different than what we did in the old code.
273    
274    First, there is something about the MLRiscGen code generator
275    that we should be aware of:
276    
277    o MLRiscGen performs code motion!
278    
279       In particular, it will move floating point computations and
280       address computations involving only the heap pointer to
281       their use sites (if there is only a single use).
282       What this means is that if we have a CPS record construction
283       statement
284    
285           RECORD(k,vl,w,e)
286    
287       we should never count the new record address w as live if w
288       has only one use (which is often the case).
289    
290       We should do something similar to floating point, but the transformation
291       there is much more complex, so I won't deal with that.
292    
293    Secondly, there are now two new cps primops at our disposal:
294    
295     1. rawrecord of record_kind option
296        This pure operator allocates some uninitialized storage from the heap.
297        There are two forms:
298    
299         rawrecord NONE [INT n]  allocates a tagless record of length n
300         rawrecord (SOME rk) [INT n] allocates a tagged record of length n
301                                     and initializes the tag.
302    
303     2. rawupdate of cty
304          rawupdate cty (v,i,x)
305          Assigns to x to the ith component of record v.
306          The storelist is not updated.
307    
308    We use these new primops for both spilling and increment record construction.
309    
310     1. Spilling.
311    
312        This is implemented with a linear scan algorithm (but generalized
313        to trees).  The algorithm will create a single spill record at the
314        beginning of the cps function and use rawupdate to spill to it,
315        and SELECT or SELp to reload from it.  So both spills and reloads
316        are fine-grain operations.  In contrast, in the old algorithm
317        "spills" have to be bundled together in records.
318    
319        Ideally, we should sink the spill record construction to where
320        it is needed.  We can even split the spill record into multiple ones
321        at the places where they are needed.  But CPS is not a good
322        representation for global code motion, so I'll keep it simple and
323        am not attempting this.
324    
325     2. Incremental record construction (aka record splitting).
326    
327        Long records with many component values which are simulatenously live
328        (recall that single use record addresses are not considered to
329         be live) are constructed with rawrecord and rawupdate.
330        We allocate space on the heap with rawrecord first, then gradually
331        fill it in with rawupdate.  This is the technique suggested to me
332        by Matthias.
333    
334        Some restrictions on when this is applicable:
335        1. It is not a VECTOR record.  The code generator currently does not handle
336           this case. VECTOR record uses double indirection like arrays.
337        2. All the record component values are defined in the same "basic block"
338           as the record constructor.  This is to prevent speculative
339           record construction.
340    
341    ----------------------------------------------------------------------
342    Name: Allen Leung
343    Date: 2002/02/22 01:02:00 EST
344    Tag: leunga-20020222-mlrisc-tools
345    
346    Minor bug fixes in the parser and rewriter
347    
348    ----------------------------------------------------------------------
349    Name: Allen Leung
350    Date: 2002/02/21 20:20:00 EST
351    Tag: leunga-20020221-peephole
352    
353    Regenerated the peephole files.  Some contained typos in the specification
354    and some didn't compile because of pretty printing bugs in the old version
355    of 'nowhere'.
356    
357    ----------------------------------------------------------------------
358    Name: Allen Leung
359    Date: 2002/02/19 20:20:00 EST
360    Tag: leunga-20020219-mlrisc-tools
361    Description:
362    
363       Minor bug fixes to the mlrisc-tools library:
364    
365       1.  Fixed up parsing colon suffixed keywords
366       2.  Added the ability to shut the error messages up
367       3.  Reimplemented the pretty printer and fixed up/improved
368           the pretty printing of handle and -> types.
369       4.  Fixed up generation of literal symbols in the nowhere tool.
370       5.  Added some SML keywords to to sml.sty
371    
372    ----------------------------------------------------------------------
373    Name: Matthias Blume
374    Date: 2002/02/19 16:20:00 EST
375    Tag: blume-20020219-cmffi
376    Description:
377    
378    A wild mix of changes, some minor, some major:
379    
380    * All C FFI-related libraries are now anchored under $c:
381        $/c.cm      --> $c/c.cm
382        $/c-int.cm  --> $c/internals/c-int.cm
383        $/memory.cm --> $c/memory/memory.cm
384    
385    * "make" tool (in CM) now treats its argument pathname slightly
386      differently:
387        1. If the native expansion is an absolute name, then before invoking
388           the "make" command on it, CM will apply OS.Path.mkRelative
389           (with relativeTo = OS.FileSys.getDir()) to it.
390        2. The argument will be passed through to subsequent phases of CM
391           processing without "going native".  In particular, if the argument
392           was an anchored path, then "make" will not lose track of that anchor.
393    
394    * Compiler backends now "know" their respective C calling conventions
395      instead of having to be told about it by ml-nlffigen.  This relieves
396      ml-nlffigen from one of its burdens.
397    
398    * The X86Backend has been split into X86CCallBackend and X86StdCallBackend.
399    
400    * Export C_DEBUG and C_Debug from $c/c.cm.
401    
402    * C type encoding in ml-nlffi-lib has been improved to model the conceptual
403      subtyping relationship between incomplete pointers and their complete
404      counterparts.  For this, ('t, 'c) ptr has been changed to 'o ptr --
405      with the convention of instantiating 'o with ('t, 'c) obj whenever
406      the pointer target type is complete.  In the incomplete case, 'o
407      will be instantiated with some "'c iobj" -- a type obtained by
408      using one of the functors PointerToIncompleteType or PointerToCompleteType.
409    
410      Operations that work on both incomplete and complete pointer types are
411      typed as taking an 'o ptr while operations that require the target to
412      be known are typed as taking some ('t, 'c) obj ptr.
413    
414      voidptr is now a bit "more concrete", namely "type voidptr = void ptr'"
415      where void is an eqtype without any values.  This makes it possible
416      to work on voidptr values using functions meant to operate on light
417      incomplete pointers.
418    
419    * As a result of the above, signature POINTER_TO_INCOMPLETE_TYPE has
420      been vastly simplified.
421    
422    ----------------------------------------------------------------------
423    Name: Matthias Blume
424    Date: 2002/02/19 10:48:00 EST
425    Tag: blume-20020219-pqfix
426    Description:
427    
428    Applied Chris Okasaki's bug fix for priority queues.
429    
430    ----------------------------------------------------------------------
431    Name: Matthias Blume
432    Date: 2002/02/15 17:05:00
433    Tag: Release_110_39
434    Description:
435    
436    Last-minute retagging is becoming a tradition... :-(
437    
438    This is the working release 110.39.
439    
440    ----------------------------------------------------------------------
441    Name: Matthias Blume
442    Date: 2002/02/15 16:00:00 EST
443    Tag: Release_110_39-orig
444    Description:
445    
446    Working release 110.39.  New bootfiles.
447    
448    (Update: There was a small bug in the installer so it wouldn't work
449    with all shells.  So I retagged. -Matthias)
450    
451    ----------------------------------------------------------------------
452    Name: Matthias Blume
453    Date: 2002/02/15 14:17:00 EST
454    Tag: blume-20020215-showbindings
455    Description:
456    
457    Added EnvRef.listBoundSymbols and CM.State.showBindings.  Especially
458    the latter can be useful for exploring what bindings are available at
459    the interactive prompt.  (The first function returns only the list
460    of symbols that are really bound, the second prints those but also the
461    ones that CM's autoloading mechanism knows about.)
462    
463    ----------------------------------------------------------------------
464    Name: Matthias Blume
465    Date: 2002/02/15 12:08:00 EST
466    Tag: blume-20020215-iptrs
467    Description:
468    
469    Two improvements to ml-nlffigen:
470    
471      1. Write files only if they do not exist or if their current contents
472         do not coincide with what's being written.  (That is, avoid messing
473         with the time stamps unless absolutely necessary.)
474    
475      2. Implement a "repository" mechanism for generated files related
476         to "incomplete pointer types".   See the README file for details.
477    
478    ----------------------------------------------------------------------
479    Name: Matthias Blume
480    Date: 2002/02/14 11:50:00 EST
481    Tag: blume-20020214-quote
482    Description:
483    
484    Added a type 't t_' to tag.sml (in ml-nlffi-lib.cm).  This is required
485    because of the new and improved tag generation scheme.  (Thanks to Allen
486    Leung for pointing it out.)
487    
488    ----------------------------------------------------------------------
489    Name: Lal George
490    Date: 2002/02/14 09:55:27 EST 2002
491    Tag: george-20020214-isabelle-bug
492    Description:
493    
494    Fixed the MLRISC bug sent by Markus Wenzel regarding the compilation
495    of Isabelle on the x86.
496    
497    From Allen:
498    -----------
499     I've found the problem:
500    
501         in ra-core.sml, I use the counter "blocked" to keep track of the
502         true number of elements in the freeze queue.  When the counter goes
503         to zero, I skip examining the queue.  But I've messed up the
504         bookkeeping in combine():
505    
506             else ();
507             case !ucol of
508               PSEUDO => (if !cntv > 0 then
509                     (if !cntu > 0 then blocked := !blocked - 1 else ();
510                                        ^^^^^^^^^^^^^^^^^^^^^^^
511                      moveu := mergeMoveList(!movev, !moveu)
512                     )
513                  else ();
514    
515         combine() is called to coalesce two nodes u and v.
516         I think I was thinking that if the move counts of u and v are both
517         greater than zero then after they are coalesced then one node is
518         removed from the freeze queue.  Apparently I was thinking that
519         both u and v are of low degree, but that's clearly not necessarily true.
520    
521    
522    02/12/2002:
523        Here's the patch.  HOL now compiles.
524    
525        I don't know how this impact on performance (compile
526        time or runtime).  This bug caused the RA (especially on the x86)
527        to go thru the potential spill phase when there are still nodes on the
528        freeze queue.
529    
530    
531    
532    
533    ----------------------------------------------------------------------
534    Name: Matthias Blume
535    Date: 2002/02/13 22:40:00 EST
536    Tag: blume-20020213-fptr-rtti
537    Description:
538    
539    Fixed a bug in ml-nlffigen that was introduced with one of the previous
540    updates.
541    
542    ----------------------------------------------------------------------
543    Name: Matthias Blume
544    Date: 2002/02/13 16:41:00 EST
545    Tag: blume-20020213-cmlpq
546    Description:
547    
548    Added new priority queue export symbols (which have just been added to
549    smlnj-lib.cm) to CML's version of smlnj-lib.cm.  (Otherwise CML would
550    not compile and the installer would choke.)
551    
552    ----------------------------------------------------------------------
553    Name: Matthias Blume
554    Date: 2002/02/13 16:15:00 EST
555    Tag: blume-20020213-various
556    Description:
557    
558    1. More tweaks to ml-nlffigen:
559    
560       - better internal datastructures (resulting in slight speedup)
561       - "-match" option requires exact match
562       - "localized" gensym counters (untagged structs/unions nested within
563         other structs/unions or within typedefs get a fresh counter; their
564         tag will be prefixed by a concatenation of their parents' tags)
565       - bug fixes (related to calculation of transitive closure of types
566         to be included in the output)
567    
568    2. Minor Basis updates:
569    
570       - added implementations for List.collate and Option.app
571    
572    ----------------------------------------------------------------------
573    Name: Matthias Blume
574    Date: 2002/02/11 15:55:00 EST
575    Tag: blume-20020211-gensym
576    Description:
577    
578    Added a "-gensym" option to command line of ml-nlffigen.  This can be
579    used to specify a "stem" -- a string that is inserted in all "gensym'd"
580    names (ML structure names that correspond to unnamed C structs, unions,
581    and enums), so that separate runs of ml-nlffigen do not clash.
582    
583    ----------------------------------------------------------------------
584    Name: Matthias Blume
585    Date: 2002/02/11 12:05:00 EST
586    Tag: blume-20020211-gensml
587    Description:
588    
589    A quick fix for a problem with GenSML (in the pgraph-util library):
590    Make generation of toplevel "local" optional.  (Strictly speaking,
591    signature definitions within "local" are not legal SML.)
592    
593    Other than that: updates to INSTALL and cm/TODO.
594    
595    ----------------------------------------------------------------------
596    Name: Matthias Blume
597    Date: 2002/02/08 15:00:00 EST
598    Tag: blume-20020208-uniquepid
599    Description:
600    
601    0. Version number has been bumped to 110.38.1.  NEW BOOTFILES!!!
602    
603    1. The installer (config/install.sh) has gotten smarter:
604    
605         - Configuration options are a bit easier to specify now
606           (in config/targets).
607         - Bug in recognizing .tar.bz2 files fixed.
608         - Installer automatically resolves dependencies between
609           configuration options (e.g., if you ask for eXene, you will
610           also get cml -- regardless whether you asked for it or not).
611         - Installer can run in "quieter mode" by setting the environment
612           variable INSTALL_QUIETLY to "true".  "Quieter" does not mean
613           "completely silent", though.
614         - Build HashCons library as part of smlnj-lib.
615    
616    2. A new scheme for assigning persistent identifiers to compilation
617       units (and, by extension, to types etc.) has been put into place.
618       This fixes a long-standing bug where types and even dynamic values
619       can get internally confused, thereby compromising type safety
620       (abstraction) and dynamic correctness.  See
621    
622         http://cm.bell-labs.com/cm/cs/who/blume/pid-confusion.tgz
623    
624       for an example of how things could go wrong until now.
625    
626       The downside of the new scheme is that pids are not quite as
627       persistent as they used to be: CM will generate a fresh pid
628       for every compilation unit that it thinks it sees for the first
629       time.  That means that if you compile starting from a clean, fresh
630       source tree at two different times, you end up with different
631       binaries.
632    
633       Cutoff recompilation, however, has not been compromised because
634       CM keeps pid information in special caches between runs.
635    
636    ----------------------------------------------------------------------
637  Name: Lal George  Name: Lal George
638  Date: 2002/02/07 15:34:13 EST 2002  Date: 2002/02/07 15:34:13 EST 2002
639  Tag: <none>  Tag: <none>

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