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revision 643, Fri May 12 08:29:15 2000 UTC revision 672, Mon Jun 19 04:40:29 2000 UTC
# Line 13  Line 13 
13  Description:  Description:
14  ----------------------------------------------------------------------  ----------------------------------------------------------------------
15  Name: Matthias Blume  Name: Matthias Blume
16    Date: 2000/06/19 13:40:00
17    Tag: blume-20000619-manual
18    Description:
19    
20    CM manual and system/README update.  This only covers the fact that
21    there are no more implicit anchors.  (Path environments and the "bind"
22    option to "cm" have yet to be documented.)
23    
24    ----------------------------------------------------------------------
25    Name: Matthias Blume
26    Date: 2000/06/19 11:05:00 JST
27    Tag: blume-20000619-chdir-bugfix
28    Description:
29    
30    Fixed a bug in new SrcPath module that sometimes led to a bad chDir call.
31    
32    ----------------------------------------------------------------------
33    Name: Matthias Blume
34    Date: 2000/06/18 22:00:10 JST
35    Tag: blume-20000618-implicit-anchors-really-gone
36    Description:
37    
38    I updates the previous HISTORY entry where I forgot to mention that
39    implicit anchors are no longer with us.
40    
41    The current update also gets rid of the (now useless) controller
42    CM.Control.implicit_anchors.
43    
44    ----------------------------------------------------------------------
45    Name: Matthias Blume
46    Date: 2000/06/16 17:30:00 JST
47    Tag: blume-20000616-anchorenv
48    Description:
49    
50    This patch implements the long anticipated (just kidding :) "anchor
51    environment" mechanism.  In the course of doing this, I also
52    re-implemented CM's internal "SrcPath" module from scratch.  The new
53    one should be more robust in certain boundary cases.  In any case, it
54    is a lot cleaner than its predecessor (IMHO).
55    
56    This time, although there is yet another boot file format change, I
57    kept the unpickler backward-compatible.  As a result, no new bootfiles
58    are necessary and bootstrapping is straightforward.  (You cannot read
59    new bootfiles into an old system, but the other way around is no
60    problem.)
61    
62    Visible changes:
63    
64    ** 0. Implicit path anchors (without the leading $-symbol) are no
65    longer recognized at all. This means that such path names are not
66    illegal either.  For example, the name basis.cm simply refers to a
67    local file called "basis.cm" (i.e, the name is an ordinary path
68    relative to .cm-files directory).  Or, to put it differently, only
69    names that start with $ are anchored paths.
70    
71    ** 1. The $<singlearc> abbreviation for $/<singlearc> has finally
72    vanished.
73    
74    John (Reppy) had critizised this as soon as I originally proposed and
75    implemented it, but at that time I did not really deeply believe
76    him. :) Now I came full-circle because I need the $<singlearc> syntax
77    in another place where it cannot be seen as an abbreviation for
78    $/<singlearc>.  To avoid the confusion, $<singlearc> now means what it
79    seems to mean (i.e., it "expands" into the corresponding anchor
80    value).
81    
82    However, when paths are used as members in CM description files, it
83    continues to be true that there must be at least another arc after the
84    anchor.  This is now enforced separately during semantic analysis
85    (i.e., from a lexical/syntactical point of view, the notation is ok.)
86    
87    ** 2. The "cm" class now accepts an option "bind".  The option's value
88    is a sub-option list of precisely two items -- one labeled "anchor"
89    and the other one labeled "value".  As you might expect, "anchor" is
90    used to specify an anchor name to be bound, and "value" specifies what
91    the anchor is being bound to.
92    
93    The value must be a directory name and can be given in either standard
94    syntax (including the possibility that it is itself an anchored path)
95    or native syntax.
96    
97    Examples:
98    
99       foo.cm (bind:(anchor:bar value:$mystuff/bar))
100       lib.cm (bind:(anchor:a value:"H:\\x\\y\\z"))  (* only works under windows *)
101    
102    and so on.
103    
104    The meaning of this is that the .cm-file will be processed with an
105    augmented anchor environment where the given anchor(s) is/are bound to
106    the given values(s).
107    
108    The rationale for having this feature is this: Suppose you are trying
109    to use two different (already stable) libraries a.cm and b.cm (that
110    you perhaps didn't write yourself).  Further, suppose each of these
111    two libraries internally uses its own auxiliary library $aux/lib.cm.
112    Normally you would now have a problem because the anchor "lib" can not
113    be bound to more than one value globally.  Therefore, the project that
114    uses both a.cm and b.cm must locally redirect the anchor to some other
115    place:
116    
117       a.cm (bind:(anchor:lib value:/usr/lib/smlnj/a-stuff))
118       b.cm (bind:(anchor:lib value:/usr/lib/smlnj/b-stuff))
119    
120    This hard-wires $lib/aux.cm to /usr/lib/smlnj/a-stuff/aux.cm or
121    /usr/lib/smlnj/b-stuff/aux.cm, respectively.
122    
123    Hard-wiring path names is a bit inflexible (and CM will verbosely warn
124    you when you do so at the time of CM.stabilize).  Therefore, you can
125    also use an anchored path as the value:
126    
127      a.cm (bind:(anchor:lib value:$a-lib))
128      b.cm (bind:(anchor:lib value:$b-lib))
129    
130    Now you can globally configure (using the usual CM.Anchor.anchor or
131    pathconfig machinery) bindings for "a-lib" and "b-lib".  Since "lib"
132    itself is always locally bound, setting it globally is no longer
133    meaningful or necessary (but it does not hurt either).  In fact, "lib"
134    can still be used as a global anchor for separate purposes.  As a
135    matter of fact, one can locally define "lib" in terms of a global
136    "lib":
137    
138      a.cm (bind:(anchor:lib value:$lib/a))
139      b.cm (bind:(anchor:lib value:$lib/b))
140    
141    ** 3: The encoding of path names has changed.  This affects the way
142    path names are shown in CM's progress report and also the internal
143    protocol encoding used for parallel make.
144    
145    The encoding now uses one or more ':'-separated segments.  Each
146    segments corresponds to a file that has been specified relative to the
147    file given by its preceding segment.  The first segment is either
148    relative to the CWD, absolute, or anchored.  Each segment itself is
149    basically a Unix pathname; all segments but the first are relative.
150    
151    Example:
152    
153       $foo/bar/baz.cm:a/b/c.sml
154    
155    This path denotes the file bar/a/b/c.sml relative to the directory
156    denoted by anchor "foo".  Notice that the encoding also includes
157    baz.cm which is the .cm-file that listed a/b/c.sml.  As usual, such
158    paths are resolved relative to the .cm-files directory, so baz.cm must
159    be ignored to get the "real" pathname.
160    
161    To make this fact more obvious, CM puts the names of such "virtual
162    arcs" into parentheses when they appear in progress reports. (No
163    parentheses will appear in the internal protocol encoding.)  Thus,
164    what you really see is:
165    
166      $foo/bar/(baz.cm):a/b/c.sml
167    
168    I find this notation to be much more informative than before.
169    
170    Another new feature of the encoding is that special characters
171    including parentheses, colons, (back)slashes, and white space are
172    written as \ddd (where ddd is the decimal encoding of the character).
173    
174    *** The CM manual still needs to be updated.
175    
176    ----------------------------------------------------------------------
177    Name: Allen Leung
178    Date: 2000/06/15 00:38:00
179    Tag: leunga-20000615-x86-peephole
180    
181    x86 Peephole fix by Fermin.  Affects c-- and moby only.
182    
183    ----------------------------------------------------------------------
184    Name: Matthias Blume
185    Date: 2000/06/12 11:40:00
186    Tag: blume-20000612-parmakefix
187    Description:
188    
189    More cleanup after changing the file naming scheme: This time I
190    repaired the parallel make mechanism for CMB.make which I broke earlier.
191    
192    ----------------------------------------------------------------------
193    Name: Allen Leung
194    Date: 2000/06/09 01:25:00
195    Tag: leunga-20000609-various
196    
197    None of these things should affect normal SML/NJ operations
198    
199    1. Peephole improvements provided by Fermin (c--)
200    2. New annotation DEFUSE for adding extra dependence (moby)
201    3. New X86 LOCK instructions (moby)
202    4. New machine description language for reservation tables (scheduling)
203    5. Fixes to various optimization/analysis modules (branch chaining, dominator
204       trees etc.)
205    6. I've changed the CM files so that they can work with versions
206       110.0.6, 110.25 and 110.28
207    
208    ----------------------------------------------------------------------
209    Name: Matthias Blume
210    Date: 2000/06/09 12:40:00
211    Tag: blume-20000609-log
212    Description:
213    
214    - Removed all(?) remaining RCS Log entries from sources.
215    
216    - Fixed bug in ml-yacc and ml-lex sources (use explicit anchors for
217      anchored paths).
218    
219    ----------------------------------------------------------------------
220    Name: Matthias Blume
221    Date: 2000/06/07 17:00:00 JST
222    Tag: blume-20000607-no-implicit-anchors
223    Description:
224    
225    1. This update changes the default setting for
226    CM.Control.implicit_anchors from true to false.  This means that
227    implicit anchors are no longer permitted by default.  I also tried to
228    make sure that nothing else still relies on implicit anchors.
229    (This is the next step on the schedule towards a CM that does not even
230    have the notion of implicit anchors anymore.)
231    
232    2. More CM manual updates.
233    
234    3. I managed to track down and fix the pickling bug I mentioned last
235    time.  Because of the previously existing workaround, this entails no
236    immediate practical changes.
237    
238    ----------------------------------------------------------------------
239    Name: Matthias Blume
240    Date: 2000/06/06 11:15:00 JST
241    Tag: blume-20000606-lazierpickle
242    Description:
243    
244    !!!! NEW BOOT FILES !!!!
245    
246    * The main purpose of this update is to make library pickles lazier in
247    order to reduce the initial space penalty for autoloading a library.
248    As a result, it is now possible to have $smlnj/compiler.cm
249    pre-registered.  This should take care of the many complaints or
250    inquiries about missing structure Compiler.  This required changes to
251    CM's internal data structures and small tweaks to some algorithms.
252    
253    As a neat additional effect, it is no longer necessary (for the sake
254    of lean heap image files) to distinguish between a "minimal" CM and a
255    "full" CM.  Now, there is only one CM (i.e., the "full" version:
256    $smlnj/cm.cm aka $smlnj/cm/full.cm), and it is always available at the
257    interactive top level. ($smlnj/cm/minimal.cm is gone.)
258    
259    To make the life of compiler-hackers easier, "makeml" now also
260    pre-registers $smlnj/cmb.cm (aka $smlnj/cmb/current.cm).  In other
261    words, after you bootstrap a new sml for the first time, you will not
262    have to autoload $smlnj/cmb.cm again afterwards.  (The first time
263    around you will still have to do it, though.)
264    
265    * A second change consists of major updates to the CM manual.  There
266    are now several appendices with summary information and also a full
267    specification of the CM description file syntax.
268    
269    * In directory src/system I added the script "allcross".  This script
270    invokes sml and cross-compiles the compiler for all supported
271    architectures.  (Useful when providing a new set of boot files.)
272    
273    * There seems to be a latent bug in my "lazy pickles" mechanism.  I
274    added a small tweak to pickle-util.sml to work around this problem,
275    but it is not a proper fix yet.  I will investigate further.  (The
276    effect of the bug was an inflation of library pickle size.)
277    
278    * Version number increased to 110.28.1 (to avoid compatibility problems).
279    
280    ----------------------------------------------------------------------
281    Name: Allen Leung
282    Date: 2000/05/25 17:28 EDT
283    Tag: leunga-20000525-ra
284    Description:
285    
286      Fixed a bug in freezing phase of the register allocator.
287    
288    ----------------------------------------------------------------------
289    Name: Allen Leung
290    Date: 2000/05/15 22:53 EDT
291    Tag: leunga-20000515-alpha-x86-ra
292    Description:
293    
294      1. Alpha
295    
296          Slight cleanup.  Removed the instruction SGNXL
297    
298      2. X86
299    
300          Added the following instructions to the instruction set:
301    
302            ROLx, RORx,
303            BTx, BTSx, BTLx, BTRx,
304            XCHGx, and variants with the LOCK prefix
305    
306      3. Register Allocation
307    
308          The module ra-rewrite-with-renaming has been improved.
309    
310      These have no effect on SML/NJ.
311    
312    ----------------------------------------------------------------------
313    Name: Matthias Blume
314    Date: 2000/05/15 16:20:00 JST
315    Tag: blume-20000515-lightrebuild
316    Description:
317    
318    1. I added an alternative to "-rebuild" to "makeml".  The difference is
319       that prior to calling CMB.make' the CM-variable "LIGHT" will be
320       defined.  In effect, the command will not build any cross-compiler
321       backends and therefore finish more quickly.
322    
323       The "fixpt" script also takes a "-light" switch to be able to use
324       this new facility while compiling for a fixpoint.
325    
326    2. I replaced all mentions of anchored paths in group owner specifications
327       with simple relative paths (usually starting with "..").
328       The rationale is that a library's internal workings should not be
329       compromised by the lack of some anchor.  (An anchor is necessary
330       for someone who wants to refer to the library by an anchored path,
331       but it should not be necessary to build the same library in the first
332       place.)
333    
334    3. I changed the way CM's tool mechanism determines the shell command
335       string used for things like ml-yacc etc. so that it does not break
336       when CM.Control.implicit_anchors is turned off.
337    
338    ----------------------------------------------------------------------
339    Name: Matthias Blume
340    Date: 2000/05/12 18:20:00 JST
341    Tag: blume-20000512-ml-build
342    Description:
343    
344    Fixed a bug in config/_ml-build that prevented ml-yacc and ml-lex from
345    getting installed properly (by config/install.sh).
346    
347    ----------------------------------------------------------------------
348    Name: Matthias Blume
349  Date: 2000/05/12 17:30:00 JST  Date: 2000/05/12 17:30:00 JST
350  Tag: blume-20000512-anchors  Tag: blume-20000512-anchors
351  Description:  Description:
# Line 435  Line 768 
768    
769  3.  Assembly  3.  Assembly
770    
771      When generating assemby, resolve the value of client defined constants,      When generating assembly, resolve the value of client defined constants,
772      instead of generating symbolic values.  This is controlled by the      instead of generating symbolic values.  This is controlled by the
773      new flag "asm-resolve-constants", which is default to true.      new flag "asm-resolve-constants", which is default to true.
774    
# Line 458  Line 791 
791    
792  To this end, I arranged that instead of "structure Core" as "structure  To this end, I arranged that instead of "structure Core" as "structure
793  _Core" is bound in the pervasive environment.  Core access is done via  _Core" is bound in the pervasive environment.  Core access is done via
794  _Core (which can never be accidentially rebound because _Core is not a  _Core (which can never be accidentally rebound because _Core is not a
795  legal surface-syntax symbol).  legal surface-syntax symbol).
796    
797  The current solution is much cleaner because the core environment is  The current solution is much cleaner because the core environment is
# Line 468  Line 801 
801  with dynamic and symbolic parts of the core environment.  with dynamic and symbolic parts of the core environment.
802    
803  Remaining hackery (to bind the "magic" symbol _Core) is localized in the  Remaining hackery (to bind the "magic" symbol _Core) is localized in the
804  compilation mananger's bootstrap compiler (actually: in the "init group"  compilation manager's bootstrap compiler (actually: in the "init group"
805  handling).  See the comments in src/system/smlnj/init/init.cmi for  handling).  See the comments in src/system/smlnj/init/init.cmi for
806  more details.  more details.
807    
# Line 583  Line 916 
916     (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
917     used).     used).
918    
919     This was done to accomodate the new "make" and "shell" tools which     This was done to accommodate the new "make" and "shell" tools which
920     facilitate fairly seemless hookup to portions of code managed using     facilitate fairly seamless hookup to portions of code managed using
921     Makefiles or Shell scripts.     Makefiles or Shell scripts.
922    
923     There are no classes "shared" or "private" anymore.  Instead, the     There are no classes "shared" or "private" anymore.  Instead, the
# Line 596  Line 929 
929    
930     All existing tools are described in the CM manual.     All existing tools are described in the CM manual.
931    
932     - Slightly better error handling.  (CM now surpresses many followup     - Slightly better error handling.  (CM now suppresses many followup
933     error messages that tended to be more annoying than helpful.)     error messages that tended to be more annoying than helpful.)
934    
935  2. Major changes to the compiler's static environment data structures.  2. Major changes to the compiler's static environment data structures.
# Line 730  Line 1063 
1063    
1064       I've changed andl to testl in the floating point test sequence       I've changed andl to testl in the floating point test sequence
1065       whenever appropriate.  The Intel optimization guide states that       whenever appropriate.  The Intel optimization guide states that
1066       testl is perferable to andl.       testl is preferable to andl.
1067    
1068  7. RA (x86 only)  7. RA (x86 only)
1069    
# Line 912  Line 1245 
1245    
1246  1. Tools.registerStdShellCmdTool (from smlnj/cm/tool.cm) takes an  1. Tools.registerStdShellCmdTool (from smlnj/cm/tool.cm) takes an
1247  additional argument called "template" which is an optional string that  additional argument called "template" which is an optional string that
1248  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
1249  explanation.  explanation.
1250    
1251  2. A special-purpose tool can be "regisitered" by simply dropping the  2. A special-purpose tool can be "registered" by simply dropping the
1252  corresponding <...>-tool.cm (and/or <...>-ext.cm) into the same  corresponding <...>-tool.cm (and/or <...>-ext.cm) into the same
1253  directory where the .cm file lives that uses this tool.  (The  directory where the .cm file lives that uses this tool.  (The
1254  behavior/misfeature until now was to look for the tool description  behavior/misfeature until now was to look for the tool description
# Line 959  Line 1292 
1292  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
1293  <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,
1294  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
1295  perhaps got accidentially killed).  In this case, fixpt will quickly  perhaps got accidentally killed).  In this case, fixpt will quickly
1296  move through what exists before continuing where it left off earlier,  move through what exists before continuing where it left off earlier,
1297  and, thus, saves a lot of time.  and, thus, saves a lot of time.
1298    
# Line 1009  Line 1342 
1342    it from that remote directory.    it from that remote directory.
1343    This should simplify installation further:  For machines that have    This should simplify installation further:  For machines that have
1344    access to the internet, just fetch <version>-config.tgz, unpack it,    access to the internet, just fetch <version>-config.tgz, unpack it,
1345    edit config/targets, and go (run config/install.sh).  The scipt will    edit config/targets, and go (run config/install.sh).  The script will
1346    fetch everything else that it might need all by itself.    fetch everything else that it might need all by itself.
1347    
1348    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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