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revision 640, Tue May 9 02:33:09 2000 UTC revision 666, Fri Jun 16 08:27:00 2000 UTC
# Line 12  Line 12 
12  Tag: <post-commit CVS tag>  Tag: <post-commit CVS tag>
13  Description:  Description:
14  ----------------------------------------------------------------------  ----------------------------------------------------------------------
15    Name: Matthias Blume
16    Date: 2000/06/16 17:30:00 JST
17    Tag: blume-20000616-anchorenv
18    Description:
19    
20    This patch implements the long anticipated (just kidding :) "anchor
21    environment" mechanism.  In the course of doing this, I also
22    re-implemented CM's internal "SrcPath" module from scratch.  The new
23    one should be more robust in certain boundary cases.  In any case, it
24    is a lot cleaner than its predecessor (IMHO).
25    
26    This time, although there is yet another boot file format change, I
27    kept the unpickler backward-compatible.  As a result, no new bootfiles
28    are necessary and bootstrapping is straightforward.  (You cannot read
29    new bootfiles into an old system, but the other way around is no
30    problem.)
31    
32    Visible changes:
33    
34    ** 1. The $<singlearc> abbreviation for $/<singlearc> for anchored
35    paths has finally vanished.
36    
37    John had critizised this as soon as I originally proposed and
38    implemented it, but at that time I did not really deeply believe
39    him. :) Now I came full-circle because I need the $<singlearc> syntax
40    in another place where it cannot be seen as an abbreviation for
41    $/<singlearc>.  To avoid the confusion, $<singlearc> now means what it
42    seems to mean (i.e., it "expands" into the corresponding anchor
43    value).
44    
45    However, when paths are used as members in CM description files, it
46    continues to be true that there must be at least another arc after the
47    anchor.  This is now enforced separately during semantic analysis
48    (i.e., form a lexical/syntactical point of view, the notation is ok.)
49    
50    ** 2. The "cm" class now accepts an option "bind".  The option's value
51    is a sub-option list of precisely two items -- one labeled "anchor"
52    and the other one labeled "value".  As you might expect, "anchor" is
53    used to specify an anchor name to be bound, and "value" specifies what
54    the anchor is being bound to.
55    
56    The value must be a directory name and can be given in either standard
57    syntax (including the possibility that it is itself an anchored path)
58    or native syntax.
59    
60    Examples:
61    
62       foo.cm (bind:(anchor:bar value:$mystuff/bar))
63       lib.cm (bind:(anchor:a value:"H:\\x\\y\\z"))  (* only works under windows *)
64    
65    and so on.
66    
67    The meaning of this is that the .cm-file will be processed with an
68    augmented anchor environment where the given anchor(s) is/are bound to
69    the given values(s).
70    
71    The rationale for having this feature is this: Suppose you are trying
72    to use two different (already stable) libraries a.cm and b.cm (that
73    you perhaps didn't write yourself).  Further, suppose each of these
74    two libraries internally uses its own auxiliary library $aux/lib.cm.
75    Normally you would now have a problem because the anchor "lib" can not
76    be bound to more than one value globally.  Therefore, the project that
77    uses both a.cm and b.cm must locally redirect the anchor to some other
78    place:
79    
80       a.cm (bind:(anchor:lib value:/usr/lib/smlnj/a-stuff))
81       b.cm (bind:(anchor:lib value:/usr/lib/smlnj/b-stuff))
82    
83    This hard-wires $lib/aux.cm to /usr/lib/smlnj/a-stuff/aux.cm or
84    /usr/lib/smlnj/b-stuff/aux.cm, respectively.
85    
86    Hard-wiring path names is a bit inflexible (and CM will verbosely warn
87    you when you do so at the time of CM.stabilize).  Therefore, you can
88    also use an anchored path as the value:
89    
90      a.cm (bind:(anchor:lib value:$a-lib))
91      b.cm (bind:(anchor:lib value:$b-lib))
92    
93    Now you can globally configure (using the usual CM.Anchor.anchor or
94    pathconfig machinery) bindings for "a-lib" and "b-lib".  Since "lib"
95    itself is always locally bound, setting it globally is no longer
96    meaningful or necessary (but it does not hurt either).  In fact, "lib"
97    can still be used as a global anchor for separate purposes.  As a
98    matter of fact, one can locally define "lib" in terms of a global
99    "lib":
100    
101      a.cm (bind:(anchor:lib value:$lib/a))
102      b.cm (bind:(anchor:lib value:$lib/b))
103    
104    ** 3: The encoding of path names has changed.  This affects the way
105    path names are shown in CM's progress report and also the internal
106    protocol encoding used for parallel make.
107    
108    The encoding now uses one or more ':'-separated segments.  Each
109    segments corresponds to a file that has been specified relative to the
110    file given by its preceding segment.  The first segment is either
111    relative to the CWD, absolute, or anchored.  Each segment itself is
112    basically a Unix pathname; all segments but the first are relative.
113    
114    Example:
115    
116       $foo/bar/baz.cm:a/b/c.sml
117    
118    This path denotes the file bar/a/b/c.sml relative to the directory
119    denoted by anchor "foo".  Notice that the encoding also includes
120    baz.cm which is the .cm-file that listed a/b/c.sml.  As usual, such
121    paths are resolved relative to the .cm-files directory, so baz.cm must
122    be ignored to get the "real" pathname.
123    
124    To make this fact more obvious, CM puts the names of such "virtual
125    arcs" into parentheses when they appear in progress reports. (No
126    parentheses will appear in the internal protocol encoding.)  Thus,
127    what you really see is:
128    
129      $foo/bar/(baz.cm):a/b/c.sml
130    
131    I find this notation to be much more informative than before.
132    
133    Another new feature of the encoding is that special characters
134    including parentheses, colons, (back)slashes, and white space are
135    written as \ddd (where ddd is the decimal encoding of the character).
136    
137    ----------------------------------------------------------------------
138    Name: Allen Leung
139    Date: 2000/06/15 00:38:00
140    Tag: leunga-20000615-x86-peephole
141    
142    x86 Peephole fix by Fermin.  Affects c-- and moby only.
143    
144    ----------------------------------------------------------------------
145    Name: Matthias Blume
146    Date: 2000/06/12 11:40:00
147    Tag: blume-20000612-parmakefix
148    Description:
149    
150    More cleanup after changing the file naming scheme: This time I
151    repaired the parallel make mechanism for CMB.make which I broke earlier.
152    
153    ----------------------------------------------------------------------
154    Name: Allen Leung
155    Date: 2000/06/09 01:25:00
156    Tag: leunga-20000609-various
157    
158    None of these things should affect normal SML/NJ operations
159    
160    1. Peephole improvements provided by Fermin (c--)
161    2. New annotation DEFUSE for adding extra dependence (moby)
162    3. New X86 LOCK instructions (moby)
163    4. New machine description language for reservation tables (scheduling)
164    5. Fixes to various optimization/analysis modules (branch chaining, dominator
165       trees etc.)
166    6. I've changed the CM files so that they can work with versions
167       110.0.6, 110.25 and 110.28
168    
169    ----------------------------------------------------------------------
170    Name: Matthias Blume
171    Date: 2000/06/09 12:40:00
172    Tag: blume-20000609-log
173    Description:
174    
175    - Removed all(?) remaining RCS Log entries from sources.
176    
177    - Fixed bug in ml-yacc and ml-lex sources (use explicit anchors for
178      anchored paths).
179    
180    ----------------------------------------------------------------------
181    Name: Matthias Blume
182    Date: 2000/06/07 17:00:00 JST
183    Tag: blume-20000607-no-implicit-anchors
184    Description:
185    
186    1. This update changes the default setting for
187    CM.Control.implicit_anchors from true to false.  This means that
188    implicit anchors are no longer permitted by default.  I also tried to
189    make sure that nothing else still relies on implicit anchors.
190    (This is the next step on the schedule towards a CM that does not even
191    have the notion of implicit anchors anymore.)
192    
193    2. More CM manual updates.
194    
195    3. I managed to track down and fix the pickling bug I mentioned last
196    time.  Because of the previously existing workaround, this entails no
197    immediate practical changes.
198    
199    ----------------------------------------------------------------------
200    Name: Matthias Blume
201    Date: 2000/06/06 11:15:00 JST
202    Tag: blume-20000606-lazierpickle
203    Description:
204    
205    !!!! NEW BOOT FILES !!!!
206    
207    * The main purpose of this update is to make library pickles lazier in
208    order to reduce the initial space penalty for autoloading a library.
209    As a result, it is now possible to have $smlnj/compiler.cm
210    pre-registered.  This should take care of the many complaints or
211    inquiries about missing structure Compiler.  This required changes to
212    CM's internal data structures and small tweaks to some algorithms.
213    
214    As a neat additional effect, it is no longer necessary (for the sake
215    of lean heap image files) to distinguish between a "minimal" CM and a
216    "full" CM.  Now, there is only one CM (i.e., the "full" version:
217    $smlnj/cm.cm aka $smlnj/cm/full.cm), and it is always available at the
218    interactive top level. ($smlnj/cm/minimal.cm is gone.)
219    
220    To make the life of compiler-hackers easier, "makeml" now also
221    pre-registers $smlnj/cmb.cm (aka $smlnj/cmb/current.cm).  In other
222    words, after you bootstrap a new sml for the first time, you will not
223    have to autoload $smlnj/cmb.cm again afterwards.  (The first time
224    around you will still have to do it, though.)
225    
226    * A second change consists of major updates to the CM manual.  There
227    are now several appendices with summary information and also a full
228    specification of the CM description file syntax.
229    
230    * In directory src/system I added the script "allcross".  This script
231    invokes sml and cross-compiles the compiler for all supported
232    architectures.  (Useful when providing a new set of boot files.)
233    
234    * There seems to be a latent bug in my "lazy pickles" mechanism.  I
235    added a small tweak to pickle-util.sml to work around this problem,
236    but it is not a proper fix yet.  I will investigate further.  (The
237    effect of the bug was an inflation of library pickle size.)
238    
239    * Version number increased to 110.28.1 (to avoid compatibility problems).
240    
241    ----------------------------------------------------------------------
242    Name: Allen Leung
243    Date: 2000/05/25 17:28 EDT
244    Tag: leunga-20000525-ra
245    Description:
246    
247      Fixed a bug in freezing phase of the register allocator.
248    
249    ----------------------------------------------------------------------
250    Name: Allen Leung
251    Date: 2000/05/15 22:53 EDT
252    Tag: leunga-20000515-alpha-x86-ra
253    Description:
254    
255      1. Alpha
256    
257          Slight cleanup.  Removed the instruction SGNXL
258    
259      2. X86
260    
261          Added the following instructions to the instruction set:
262    
263            ROLx, RORx,
264            BTx, BTSx, BTLx, BTRx,
265            XCHGx, and variants with the LOCK prefix
266    
267      3. Register Allocation
268    
269          The module ra-rewrite-with-renaming has been improved.
270    
271      These have no effect on SML/NJ.
272    
273    ----------------------------------------------------------------------
274    Name: Matthias Blume
275    Date: 2000/05/15 16:20:00 JST
276    Tag: blume-20000515-lightrebuild
277    Description:
278    
279    1. I added an alternative to "-rebuild" to "makeml".  The difference is
280       that prior to calling CMB.make' the CM-variable "LIGHT" will be
281       defined.  In effect, the command will not build any cross-compiler
282       backends and therefore finish more quickly.
283    
284       The "fixpt" script also takes a "-light" switch to be able to use
285       this new facility while compiling for a fixpoint.
286    
287    2. I replaced all mentions of anchored paths in group owner specifications
288       with simple relative paths (usually starting with "..").
289       The rationale is that a library's internal workings should not be
290       compromised by the lack of some anchor.  (An anchor is necessary
291       for someone who wants to refer to the library by an anchored path,
292       but it should not be necessary to build the same library in the first
293       place.)
294    
295    3. I changed the way CM's tool mechanism determines the shell command
296       string used for things like ml-yacc etc. so that it does not break
297       when CM.Control.implicit_anchors is turned off.
298    
299    ----------------------------------------------------------------------
300    Name: Matthias Blume
301    Date: 2000/05/12 18:20:00 JST
302    Tag: blume-20000512-ml-build
303    Description:
304    
305    Fixed a bug in config/_ml-build that prevented ml-yacc and ml-lex from
306    getting installed properly (by config/install.sh).
307    
308    ----------------------------------------------------------------------
309    Name: Matthias Blume
310    Date: 2000/05/12 17:30:00 JST
311    Tag: blume-20000512-anchors
312    Description:
313    
314    !!! NEW BOOT FILES !!!
315    
316    This change is in preparation of fading out support for "implicitly
317    anchored path names".  I went through all sources and used the
318    explicit (and relatively new) $-notation.  See system/README and the
319    CM manual for more info on this.
320    
321    I also modified the anchoring scheme for some things such as "smlnj",
322    "MLRISC", "cm", etc. to take advantage of the fact that explicit
323    anchors are more expressive: anchor name and first arc do not have to
324    coincide.  This entails the following user-visible change:
325    
326    You have to write $smlnj/foo/bar instead of smlnj/foo/bar.  In
327    particular, when you fire up sml with a command-line argument, say,
328    e.g.:
329    
330       sml '$smlnj/cmb.cm'
331    
332    At the ML toplevel prompt:
333    
334       CM.autoload "$smlnj/cmb.cm";
335    
336    There is also a new controller in CM.Control that can be used to turn
337    off all remaining support for implicit anchors by saying:
338    
339        CM.autoload "$smlnj/
340        #set CM.Control.implicit_anchors false;
341    
342    This causes CM to reject implicitly anchored paths.  This is (for the
343    time being) less permissive than the "final" version where there will
344    be no more such implicit anchors and relative paths will be just that:
345    relative.
346    
347    The next step (version after next version?) will be to make the
348    default for CM.Control.implicit_anchors false.  After the dust has
349    settled, I can then produce the "final" version of this...
350    
351    Note: Since bootstrapping is a bit tricky, I provided new boot files.
352    
353    ----------------------------------------------------------------------
354    Name: Matthias Blume
355    Date: 2000/05/11 16:30:00 JST
356    Tag: blume-20000511-sources
357    Description:
358    
359    The main change is that I added function CM.sources as a generalized
360    version of the earlier CM.makedepend.  This entails the following
361    additional changes:
362    
363      - CM.makedepend has been dropped.
364    
365      - CM manual has been updated.
366    
367      - TOOLS signature and API have been changed.
368    
369    ----------------------------------------------------------------------
370    Name: Allen Leung
371    Date: 2000/05/10 21:17 EDT
372    Tag: leunga-20000510-moby-c--ssa
373    Description:
374    
375      Various bug fixes and new features for C--, Moby and MLRISC optimizations.
376    None of these affect SML/NJ.
377    
378    1. Register Allocation
379    
380        a. A new ra spilling module (ra/ra-spill-with-renaming) is implemented.
381           This module tries to remove local (i.e. basic block level) redundancies
382           during spilling.
383    
384        b. A new framework for performing region based register allocation.
385           Not yet entirely functional.
386    
387    2. X86
388    
389       a. DefUse for POP was missing the stack pointer [found by Lal]
390       b. Reload for CALL was incorrect in X86Spill [found by John]
391       c. Various fixes in X86Spill so that it can be used correctly for
392          the new spilling module.
393    
394    3. SSA/IR
395    
396       a. New module ir/dj-dataflow.sml implements elimination based
397          data flow analysis.
398    
399    4. MLRiscGen
400    
401       a. Fix for gc type annotation
402    
403    5. MDGen
404    
405       Various fixes for machine description -> ml code translation.  For ssa
406       only.
407    
408    ----------------------------------------------------------------------
409  Name: Allen Leung  Name: Allen Leung
410  Date: 2000/05/08 22:17 EDT  Date: 2000/05/08 22:17 EDT
411  Tag: leunga-20000508-labexp  Tag: leunga-20000508-labexp
# Line 335  Line 729 
729    
730  3.  Assembly  3.  Assembly
731    
732      When generating assemby, resolve the value of client defined constants,      When generating assembly, resolve the value of client defined constants,
733      instead of generating symbolic values.  This is controlled by the      instead of generating symbolic values.  This is controlled by the
734      new flag "asm-resolve-constants", which is default to true.      new flag "asm-resolve-constants", which is default to true.
735    
# Line 358  Line 752 
752    
753  To this end, I arranged that instead of "structure Core" as "structure  To this end, I arranged that instead of "structure Core" as "structure
754  _Core" is bound in the pervasive environment.  Core access is done via  _Core" is bound in the pervasive environment.  Core access is done via
755  _Core (which can never be accidentially rebound because _Core is not a  _Core (which can never be accidentally rebound because _Core is not a
756  legal surface-syntax symbol).  legal surface-syntax symbol).
757    
758  The current solution is much cleaner because the core environment is  The current solution is much cleaner because the core environment is
# Line 368  Line 762 
762  with dynamic and symbolic parts of the core environment.  with dynamic and symbolic parts of the core environment.
763    
764  Remaining hackery (to bind the "magic" symbol _Core) is localized in the  Remaining hackery (to bind the "magic" symbol _Core) is localized in the
765  compilation mananger's bootstrap compiler (actually: in the "init group"  compilation manager's bootstrap compiler (actually: in the "init group"
766  handling).  See the comments in src/system/smlnj/init/init.cmi for  handling).  See the comments in src/system/smlnj/init/init.cmi for
767  more details.  more details.
768    
# Line 483  Line 877 
877     (specified in the .cm file at each instance where the tool's class is     (specified in the .cm file at each instance where the tool's class is
878     used).     used).
879    
880     This was done to accomodate the new "make" and "shell" tools which     This was done to accommodate the new "make" and "shell" tools which
881     facilitate fairly seemless hookup to portions of code managed using     facilitate fairly seamless hookup to portions of code managed using
882     Makefiles or Shell scripts.     Makefiles or Shell scripts.
883    
884     There are no classes "shared" or "private" anymore.  Instead, the     There are no classes "shared" or "private" anymore.  Instead, the
# Line 496  Line 890 
890    
891     All existing tools are described in the CM manual.     All existing tools are described in the CM manual.
892    
893     - Slightly better error handling.  (CM now surpresses many followup     - Slightly better error handling.  (CM now suppresses many followup
894     error messages that tended to be more annoying than helpful.)     error messages that tended to be more annoying than helpful.)
895    
896  2. Major changes to the compiler's static environment data structures.  2. Major changes to the compiler's static environment data structures.
# Line 630  Line 1024 
1024    
1025       I've changed andl to testl in the floating point test sequence       I've changed andl to testl in the floating point test sequence
1026       whenever appropriate.  The Intel optimization guide states that       whenever appropriate.  The Intel optimization guide states that
1027       testl is perferable to andl.       testl is preferable to andl.
1028    
1029  7. RA (x86 only)  7. RA (x86 only)
1030    
# Line 812  Line 1206 
1206    
1207  1. Tools.registerStdShellCmdTool (from smlnj/cm/tool.cm) takes an  1. Tools.registerStdShellCmdTool (from smlnj/cm/tool.cm) takes an
1208  additional argument called "template" which is an optional string that  additional argument called "template" which is an optional string that
1209  specifiel the layout of the tool command line.  See the CM manual for  specifies the layout of the tool command line.  See the CM manual for
1210  explanation.  explanation.
1211    
1212  2. A special-purpose tool can be "regisitered" by simply dropping the  2. A special-purpose tool can be "registered" by simply dropping the
1213  corresponding <...>-tool.cm (and/or <...>-ext.cm) into the same  corresponding <...>-tool.cm (and/or <...>-ext.cm) into the same
1214  directory where the .cm file lives that uses this tool.  (The  directory where the .cm file lives that uses this tool.  (The
1215  behavior/misfeature until now was to look for the tool description  behavior/misfeature until now was to look for the tool description
# Line 859  Line 1253 
1253  rebuild.  Having sets of the form <base><k>.{bin,boot}.<arch>-unix for  rebuild.  Having sets of the form <base><k>.{bin,boot}.<arch>-unix for
1254  <k>=1,2,... is normally not a good idea when invoking fixpt.  However,  <k>=1,2,... is normally not a good idea when invoking fixpt.  However,
1255  they might be the result of an earlier partial run of fixpt (which  they might be the result of an earlier partial run of fixpt (which
1256  perhaps got accidentially killed).  In this case, fixpt will quickly  perhaps got accidentally killed).  In this case, fixpt will quickly
1257  move through what exists before continuing where it left off earlier,  move through what exists before continuing where it left off earlier,
1258  and, thus, saves a lot of time.  and, thus, saves a lot of time.
1259    
# Line 909  Line 1303 
1303    it from that remote directory.    it from that remote directory.
1304    This should simplify installation further:  For machines that have    This should simplify installation further:  For machines that have
1305    access to the internet, just fetch <version>-config.tgz, unpack it,    access to the internet, just fetch <version>-config.tgz, unpack it,
1306    edit config/targets, and go (run config/install.sh).  The scipt will    edit config/targets, and go (run config/install.sh).  The script will
1307    fetch everything else that it might need all by itself.    fetch everything else that it might need all by itself.
1308    
1309    For CVS users, this mechanism is not relevant for source archives, but    For CVS users, this mechanism is not relevant for source archives, but

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