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revision 879, Thu Jul 19 18:59:38 2001 UTC revision 959, Fri Oct 12 21:21:41 2001 UTC
# Line 13  Line 13 
13  Description:  Description:
14    
15  ----------------------------------------------------------------------  ----------------------------------------------------------------------
16    Name: Allen Leung
17    Date: 2001/10/12 17:18:32 EDT 2001
18    Tag: leung-20011012-x86-printflowgraph
19    Description:
20    
21    X86RA now uses a valid (instead of dummy) PrintFlowgraph module.
22    
23    ----------------------------------------------------------------------
24    Name: Lal George
25    Date: 2001/10/11 23:51:34 EDT
26    Tag: george-20011011-too-many-instrs
27    Description:
28    
29    The representation of a program point never expected to see more
30    than 65536 instructions in a basic block!
31    
32    ----------------------------------------------------------------------
33    Name: Lal George
34    Date: 2001/10/09 09:41:37 EDT
35    Tag: george-20011008-mlrisc-labels
36    Description:
37    
38    Changed the machine description files to support printing of
39    local and global labels in assembly code, based on host assembler
40    conventions.
41    
42    ----------------------------------------------------------------------
43    Name: Matthias Blume
44    Date: 2001/09/25 15:25:00 EDT
45    Tag: blume-20010925-exninfo
46    Description:
47    
48    I provided a non-hook implementation of exnName (at the toplevel) and
49    made the "dummy" implementation of exnMessage (at the toplevel) more
50    useful: if nothing gets "hooked in", then at least you are going to
51    see the exception name and a message indicating why you don't see more.
52    
53    [For the time being, programs that need exnMessage and want to use
54    ml-build should either use General.exnMessage (strongly recommended) or
55    refer to structure General at some other point so that CM sees a
56    static dependency.]
57    
58    [Similar remarks go for "print" and "use":  If you want to use their
59    functionality in stand-alone programs generated by ml-build, then use
60    TextIO.output and Backend.Interact.useFile (from $smlnj/compiler.cm).]
61    
62    ----------------------------------------------------------------------
63    Name: Matthias Blume
64    Date: 2001/09/20 17:28:00 EDT
65    Tag: blume-20010920-slowfp
66    Description:
67    
68    Allen says that x86-fast-fp is not safe yet, so I turned it off again...
69    
70    ----------------------------------------------------------------------
71    Name: Matthias Blume
72    Date: 2001/09/20 17:20:00 EDT
73    Tag: blume-20010920-canonicalpaths
74    Description:
75    
76    0. Updated the BOOT file (something that I forgot to do earlier).
77    
78    1. Small internal change to CM so that it avoids "/../" in filenames
79       as much as possible (but only where it is safe).
80    
81    2. Changed config/_run-sml (resulting in a changed bin/.run-sml) so
82       that arguments that contain delimiters are passed through correctly.
83       This change also means that all "special" arguments of the form
84       @SMLxxx... must come first.
85    
86    3. Changed install script to put relative anchor names for tool commands
87       into pathconfig.
88    
89    ----------------------------------------------------------------------
90    Name: Matthias Blume
91    >>>>>>> 1.169
92    Date: 2001/09/18 15:35:00 EDT
93    Tag: blume-20010918-readme11036
94    Description:
95    
96    Added README files.
97    
98    ----------------------------------------------------------------------
99    Name: Matthias Blume
100    Date: 2001/09/18 11:45:00 EDT
101    Tag: Release_110_36 (retag)
102    Description:
103    
104    Fixed mistake in config/preloads. Retagged as 110.36.
105    
106    ----------------------------------------------------------------------
107    Name: Matthias Blume
108    Date: 2001/09/18 09:40:00 EDT
109    Tag: Release_110_36_orig (tag changed)
110    Description:
111    
112    New version (110.36).  New bootfiles.
113    
114    ----------------------------------------------------------------------
115    Name: Matthias Blume
116    Date: 2001/09/14 16:15:00 EDT
117    Tag: blume-20010914-x86fastfp
118    Description:
119    
120    John committed some changes that Allen made, in particular a (hopefully)
121    correctly working version of the x86-fp module.
122    
123    I changed the default setting of the Control.MLRISC.getFlag "x86-fast-fp"
124    flag to "true".  Everything seems to compile to a fixpoint ok, and
125    "mandelbrot" speeds up by about 15%.
126    
127    ----------------------------------------------------------------------
128    Name: Matthias Blume
129    Date: 2001/09/13 11:20:00 EDT
130    Tag: blume-20010913-minimal
131    Description:
132    
133    1. Stefan Monnier's patch to fix a miscompilation problem that
134       was brought to light by John Reppy's work on Moby.
135    
136    2. Implemented a minimal "structure Compiler" that contains just
137       "version" and "architecture".  The minimal version will be
138       available when the full version is not.  This is for backward-
139       compatibility with code that wants to test Compiler.version.
140    
141    ----------------------------------------------------------------------
142    Name: Matthias Blume
143    Date: 2001/08/28 14:03:00 EDT
144    Tag: blume-20010828-ml-lex
145    Description:
146    
147    Fix for bug 1581, received from Neophytos Michael.
148    
149    ----------------------------------------------------------------------
150    Name: Matthias Blume
151    Date: 2001/08/27 11:20:00 EDT
152    Tag: blume-20010827-readme11035
153    Description:
154    
155    Fleshed out the README file for 110.35.
156    
157    ----------------------------------------------------------------------
158    Name: Matthias Blume
159    Date: 2001/08/24 17:10:00 EDT
160    Tag: Release_110_35
161    Description:
162    
163    New version number (110.35).  New bootfiles.
164    
165    ----------------------------------------------------------------------
166    Name: Lal George
167    Date: 2001/08/24 13:47:18 EDT 2001
168    Tag: george-20010824-MLRISC-graphs
169    Description:
170    
171     removed clusters from MLRISC completely and replaced with graphs.
172    
173    ----------------------------------------------------------------------
174    Name: Matthias Blume
175    Date: 2001/08/23 17:50:00 EDT
176    Tag: blume-20010823-toplevel
177    Description:
178    
179    - some reorganization of the code that implements various kinds of
180      environments in the compiler (static, dynamic, symbolic, combined)
181    - re-implemented the EnvRef module so that evalStream works properly
182      (if the stream contains references to "use", "CM.make", etc.)
183    - cleaned up evalloop.sml and interact.sml (but they need more cleaning)
184    
185    ----------------------------------------------------------------------
186    Name: Matthias Blume
187    Date: 2001/08/20 15:50 EDT
188    Tag: blume20010820-slipup
189    Description:
190    
191    I forgot to commit a few files.  Here they are...
192    
193    ----------------------------------------------------------------------
194    Name: Matthias Blume
195    Date: 2001/08/20 15:35:00 EDT
196    Tag: blume-20010820-debugprof
197    Description:
198    
199    !!!! NEW BOOTFILES !!!!
200    
201    This is another round of reorganizing the compiler sources.  This
202    time the main goal was to factor out all the "instrumentation"
203    passes (for profiling and backtracing) into their own library.
204    The difficulty was to do it in such a way that it does not depend
205    on elaborate.cm but only on elabdata.cm.
206    
207    Therefore there have been further changes to both elaborate.cm and
208    elabdata.cm -- more "generic" things have been moved from the former
209    to the latter.  As a result, I was forced to split the assignment
210    of numbers indicating "primtyc"s into two portions: SML-generic and
211    SML/NJ-specific.  Since it would have been awkward to maintain,
212    I bit the bullet and actually _changed_ the mapping between these
213    numbers and primtycs.  The bottom line of this is that you need
214    a new set of bin- and bootfiles.
215    
216    I have built new bootfiles for all architectures, so doing a fresh
217    checkout and config/install.sh should be all you need.
218    
219    The newly created library's name is
220    
221        $smlnj/viscomp/debugprof.cm
222    
223    and its sources live under
224    
225        src/compiler/DebugProf
226    
227    ----------------------------------------------------------------------
228    Name: Matthias Blume
229    Date: 2001/08/15 17:15:00 EDT
230    Tag: blume-20010815-compreorg
231    Description:
232    
233    This is a first cut at reorganizing the CM libraries that make up the
234    core of the compiler.  The idea is to separate out pieces that could
235    be used independently by tools, e.g., the parser, the typechecker, etc.
236    
237    The current status is a step in this direction, but it is not quite
238    satisfactory yet.  Expect more changes in the future.
239    
240    Here is the current (new) organization...
241    
242        What used to be $smlnj/viscomp/core.cm is now divided into
243        six CM libraries:
244    
245             $smlnj/viscomp/basics.cm
246                           /parser.cm
247                           /elabdata.cm
248                           /elaborate.cm
249                           /execute.cm
250                           /core.cm
251    
252        The CM files for these libraries live under src/system/smlnj/viscomp.
253        All these libraries are proxy libraries that contain precisely
254        one CM library component.  Here are the locations of the components
255        (all within the src/compiler tree):
256    
257             Basics/basics.cm
258             Parse/parser.cm
259             ElabData/elabdata.cm
260             Elaborator/elaborate.cm
261             Execution/execute.cm
262             core.cm
263    
264         [This organization is the same that has been used already
265         for a while for the architecture-specific parts of the visible
266         compiler and for the old version of core.cm.]
267    
268         As you will notice, many source files have been moved from their
269         respective original locations to a new home in one of the above
270         subtrees.
271    
272         The division of labor between the new libraries is the following:
273    
274             basics.cm:
275                - Simple, basic definitions that pertain to many (or all) of
276                  the other libraries.
277             parser.cm:
278                - The SML parser, producing output of type Ast.dec.
279                - The type family for Ast is also defined and exported here.
280             elabdata.cm:
281                - The datatypes that describe input and output of the elaborator.
282                  This includes types, absyn, and static environments.
283             elaborator.cm:
284                - The SML/NJ type checker and elaborator.
285                  This maps an Ast.dec (with a given static environment) to
286                  an Absyn.dec (with a new static environment).
287                - This libraries implements certain modules that used to be
288                  structures as functors (to remove dependencies on FLINT).
289             execute.cm:
290                - Everything having to do with executing binary code objects.
291                - Dynamic environments.
292             core.cm:
293                - SML/NJ-specific instantiations of the elaborator and MLRISC.
294                - Top-level modules.
295                - FLINT (this should eventually become its own library)
296    
297    Notes:
298    
299    I am not 100% happy with the way I separated the elaborator (and its
300    data structures) from FLINT.  Two instances of the same problem:
301    
302        1. Data structures contain certain fields that carry FLINT-specific
303           information.  I hacked around this using exn and the property list
304           module from smlnj-lib.  But the fact that there are middle-end
305           specific fields around at all is a bit annoying.
306    
307        2. The elaborator calculates certain FLINT-related information.  I tried
308           to make this as abstract as I could using functorization, but, again,
309           the fact that the elaborator has to perform calculations on behalf
310           of the middle-end at all is not nice.
311    
312        3. Having to used exn and property lists is unfortunate because it
313           weakens type checking.  The other alternative (parameterizing
314           nearly *everything*) is not appealing, though.
315    
316    I removed the "rebinding =" warning hack because due to the new organization
317    it was awkward to maintain it.  As a result, the compiler now issues some of
318    these warnings when compiling init.cmi during bootstrap compilation. On
319    the plus side, you also get a warning when you do, for example:
320       val op = = Int32.+
321    which was not the case up to now.
322    
323    I placed "assign" and "deref" into the _Core structure so that the
324    code that deals with the "lazy" keyword can find them there.  This
325    removes the need for having access to the primitive environment
326    during elaboration.
327    
328    ----------------------------------------------------------------------
329    Name: Matthias Blume
330    Date: 2001/08/13
331    Tag: blume-20010813-closures
332    Description:
333    
334    This fix was sent to us by Zhong Shao.  It is supposed to improve the
335    performance of certain loops by avoiding needless closure allocation.
336    
337    ----------------------------------------------------------------------
338    Name: Lal George
339    Date: 2001/07/31 10:03:23 EDT 2001
340    Tag: george-20010731-x86-fmalloc
341    Description: Fixed bug in x86 calls
342    
343        There was a bug where call instructions would mysteriously
344        vanish. The call instruction had to be one that returned
345        a floating point value.
346    
347    ----------------------------------------------------------------------
348    Name: Lal George
349    Date: 2001/07/19 16:36:29 EDT 2001
350    Tag: george-20010719-simple-cells
351    Description:
352    
353    I have dramatically simplified the interface for CELLS in MLRISC.
354    
355    In summary, the cells interface is broken up into three parts:
356    
357      1. CellsBasis : CELLS_BASIS
358    
359            CellsBasis is a top level structure and common for all
360            architectures.  it contains the definitions of basic datatypes
361            and utility  functions over these types.
362    
363      2. functor Cells() : CELLS
364    
365            Cells generates an interface for CELLS that incorporates the
366            specific resources on the target architecture, such as the
367            presence of special register classes, their number and size,
368            and various useful substructures.
369    
370      3. <ARCH>CELLS
371    
372            e.g. SparcCells: SPARCCELLS
373    
374            <ARCH>CELLS usually contains additional bindings for special
375            registers  on the architecture, such as:
376    
377                    val r0 : cell           (* register zero *)
378                    val y : cell            (* Y register *)
379                    val psr : cell          (* processor status register *)
380                    ...
381    
382            The structure returned by applying the Cells functor is opened
383            in this interface.
384    
385    The main implication of all this is that the datatypes for cells is
386    split between CellsBasis and CELLS -- a fairly simple change for user
387    code.
388    
389    In the old scheme the CELLS interface had a definitional binding of
390    the form:
391    
392            signature CELLS = sig
393    
394               structure CellsBasis = CellsBasis
395    
396               ...
397    
398            end
399    
400    With all the sharing constraints that goes on in MLRISC, this old
401    design  quickly leads to errors such as:
402    
403            "structure definition spec inside of sharing ... "
404    
405    
406    and appears to require an unacceptable amount of sharing and where
407    constraint hackery.
408    
409    I think this error message (the interaction of definitional specs and
410    sharing) requires more explanation on our web page.
411    
412    ----------------------------------------------------------------------
413  Name: Matthias Blume  Name: Matthias Blume
414  Date: 2001/07/19 15:00:00 EDT  Date: 2001/07/19 15:00:00 EDT
415  Tag: blume-20010719-libreorg  Tag: blume-20010719-libreorg
# Line 2668  Line 3065 
3065       elaborator). There were a lot of changes during my "linkpath" trials       elaborator). There were a lot of changes during my "linkpath" trials
3066       that could have been reverted to their original state but weren't.       that could have been reverted to their original state but weren't.
3067       Please, don't be too harsh on me for messing with this code a bit more       Please, don't be too harsh on me for messing with this code a bit more
3068       than what was strictly necessary...  (I _did_ resist the tempation       than what was strictly necessary...  (I _did_ resist the temptation
3069       of doing any "global reformatting" to avoid an untimely death at       of doing any "global reformatting" to avoid an untimely death at
3070       Dave's hands. :)       Dave's hands. :)
3071    

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