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[smlnj] Diff of /sml/trunk/HISTORY

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Diff of /sml/trunk/HISTORY

-revision 874, Mon Jul  9 20:01:40 2001 UTC
+revision 1116, Tue Mar  5 23:17:18 2002 UTC
 Line 8
  The form of an entry should be:
  Name:
- Date:
+ Date: yyyy/mm/dd
  Tag: <post-commit CVS tag>
  Description:
  ----------------------------------------------------------------------
+ Name: Lal George
+ Date: 2002/03/05 17:24:48 EST
+ Tag: george-20020305-linkage-cluster
+ In order to support the block placement optimization, the first
+ cluster that is generated (called the linkage cluster) contains a jump
+ to the entry point for the compilation unit. The linkage cluster
+ contains only one function, so block placement will have no effect on
+ the linkage cluster itself, but all the other clusters have full
+ freedom in the manner in which they reorder blocks or functions.
+ On the x86 the typical linkage code that is generated is:
+    ----------------------
+         .align 2
+    L0:
+         addl    $L1-L0, 72(%esp)
+         jmp     L0
+         .align  2
+    L1:
+    ----------------------
+(%esp) is the memory location for the stdlink register. This
+ must contain the address of the CPS function being called. In the
+ above example, it contains the address of memory for  L0; before
+ calling L1 (the real entry point for the compilation unit), it
+ must contain the address for L1, and hence
+         addl $L1-L0, 72(%esp)
+ I have tested this on all architectures except the hppa.
+ ----------------------------------------------------------------------
+ Name: Allen Leung
+ Date: 2002/03/03 13:20:00 EST
+ Tag: leunga-20020303-mlrisc-tools
+   Added #[ ... ] expressions to mlrisc tools
+ ----------------------------------------------------------------------
+ Name: Matthias Blume
+ Date: 2002/02/27 12:29:00 EST
+ Tag: blume-20020227-cdebug
+ Description:
+ - made types in structure C and C_Debug to be equal
+ - got rid of code duplication (c-int.sml vs. c-int-debug.sml)
+ - there no longer is a C_Int_Debug (C_Debug is directly derived from C)
+ ----------------------------------------------------------------------
+ Name: Matthias Blume
+ Date: 2002/02/26 12:00:00 EST
+ Tag: blume-20020226-ffi
+ Description:
+. Fixed a minor bug in CM's "noweb" tool:
+    If numbering is turned off, then truly don't number (i.e., do not
+    supply the -L option to noweb).  The previous behavior was to supply
+    -L'' -- which caused noweb to use the "default" line numbering scheme.
+    Thanks to Chris Richards for pointing this out (and supplying the fix).
+. Once again, I reworked some aspects of the FFI:
+    A. The incomplete/complete type business:
+    - Signatures POINTER_TO_INCOMPLETE_TYPE and accompanying functors are
+      gone!
+    - ML types representing an incomplete type are now *equal* to
+      ML types representing their corresponding complete types (just like
+      in C).  This is still safe because ml-nlffigen will not generate
+      RTTI for incomplete types, nor will it generate functions that
+      require access to such RTTI.   But when ML code generated from both
+      incomplete and complete versions of the C type meet, the ML types
+      are trivially interoperable.
+      NOTE:  These changes restore the full generality of the translation
+      (which was previously lost when I eliminated functorization)!
+    B. Enum types:
+    - Structure C now has a type constructor "enum" that is similar to
+      how the "su" constructor works.  However, "enum" is not a phantom
+      type because each "T enum" has values (and is isomorphic to
+      MLRep.Signed.int).
+    - There are generic access operations for enum objects (using
+      MLRep.Signed.int).
+    - ml-nlffigen will generate a structure E_foo for each "enum foo".
+      * The structure contains the definition of type "mlrep" (the ML-side
+      representation type of the enum).  Normally, mlrep is the same
+      as "MLRep.Signed.int", but if ml-nlffigen was invoked with "-ec",
+      then mlrep will be defined as a datatype -- thus facilitating
+      pattern matching on mlrep values.
+      ("-ec" will be suppressed if there are duplicate values in an
+       enumeration.)
+      * Constructors ("-ec") or values (no "-ec") e_xxx of type mlrep
+      will be generated for each C enum constant xxx.
+      * Conversion functions m2i and i2m convert between mlrep and
+      MLRep.Signed.int.  (Without "-ec", these functions are identities.)
+      * Coversion functions c and ml convert between mlrep and "tag enum".
+      * Access functions (get/set) fetch and store mlrep values.
+    - By default (unless ml-nlffigen was invoked with "-nocollect"), unnamed
+      enumerations are merged into one single enumeration represented by
+      structure E_'.
+ ----------------------------------------------------------------------
+ Name: Allen Leung
+ Date: 2002/02/25 04:45:00 EST
+ Tag: leunga-20020225-cps-spill
+ This is a new implementation of the CPS spill phase.
+ The new phase is in the new file compiler/CodeGen/cpscompile/spill-new.sml
+ In case of problems, replace it with the old file spill.sml
+ The current compiler runs into some serious performance problems when
+ constructing a large record.  This can happen when we try to compile a
+ structure with many items.  Even a very simple structure like the following
+ makes the compiler slow down.
+     structure Foo = struct
+        val x_1 = 0w1 : Word32.int
+        val x_2 = 0w2 : Word32.int
+        val x_3 = 0w3 : Word32.int
+        ...
+        val x_N = 0wN : Word32.int
+     end
+ The following table shows the compile time, from N=1000 to N=4000,
+ with the old compiler:
+ N
+  CPS 100 spill                           0.04u  0.00s  0.00g
+        MLRISC ra                               0.06u  0.00s  0.05g
+           (spills = 0 reloads = 0)
+        TOTAL                                   0.63u  0.07s  0.21g
+  CPS 100 spill                           8.25u  0.32s  0.64g
+        MLRISC ra                               5.68u  0.59s  3.93g
+           (spills = 0 reloads = 0)
+        TOTAL                                   14.71u  0.99s  4.81g
+  CPS 100 spill                           58.55u  2.34s  1.74g
+        MLRISC ra                               5.54u  0.65s  3.91g
+           (spills = 543 reloads = 1082)
+        TOTAL                                   65.40u  3.13s  6.00g
+  CPS 100 spill                           126.69u  4.84s  3.08g
+        MLRISC ra                               0.80u  0.10s  0.55g
+           (spills = 42 reloads = 84)
+        TOTAL                                   129.42u  5.10s  4.13g
+  CPS 100 spill                           675.59u  19.03s  11.64g
+        MLRISC ra                               2.69u  0.27s  1.38g
+           (spills = 62 reloads = 124)
+        TOTAL                                   682.48u  19.61s  13.99g
+  CPS 100 spill                           2362.82u  56.28s  43.60g
+        MLRISC ra                               4.96u  0.27s  2.72g
+           (spills = 85 reloads = 170)
+        TOTAL                                   2375.26u  57.21s  48.00g
+ As you can see the old cps spill module suffers from some serious
+ performance problem.  But since I cannot decipher the old code fully,
+ instead of patching the problems up, I'm reimplementing it
+ with a different algorithm.  The new code is more modular,
+ smaller when compiled, and substantially faster
+ (O(n log n) time and O(n) space).  Timing of the new spill module:
+ CPS 100 spill                           0.02u  0.00s  0.00g
+       MLRISC ra                               0.25u  0.02s  0.15g
+          (spills=1 reloads=3)
+       TOTAL                                   7.74u  0.34s  1.62g
+ Implementation details:
+ As far as I can tell, the purpose of the CPS spill module is to make sure the
+ number of live variables at any program point (the bandwidth)
+ does not exceed a certain limit, which is determined by the
+ size of the spill area.
+ When the bandwidth is too large, we decrease the register pressure by
+ packing live variables into spill records.  How we achieve this is
+ completely different than what we did in the old code.
+ First, there is something about the MLRiscGen code generator
+ that we should be aware of:
+ o MLRiscGen performs code motion!
+    In particular, it will move floating point computations and
+    address computations involving only the heap pointer to
+    their use sites (if there is only a single use).
+    What this means is that if we have a CPS record construction
+    statement
+        RECORD(k,vl,w,e)
+    we should never count the new record address w as live if w
+    has only one use (which is often the case).
+    We should do something similar to floating point, but the transformation
+    there is much more complex, so I won't deal with that.
+ Secondly, there are now two new cps primops at our disposal:
+. rawrecord of record_kind option
+     This pure operator allocates some uninitialized storage from the heap.
+     There are two forms:
+      rawrecord NONE [INT n]  allocates a tagless record of length n
+      rawrecord (SOME rk) [INT n] allocates a tagged record of length n
+                                  and initializes the tag.
+. rawupdate of cty
+       rawupdate cty (v,i,x)
+       Assigns to x to the ith component of record v.
+       The storelist is not updated.
+ We use these new primops for both spilling and increment record construction.
+. Spilling.
+     This is implemented with a linear scan algorithm (but generalized
+     to trees).  The algorithm will create a single spill record at the
+     beginning of the cps function and use rawupdate to spill to it,
+     and SELECT or SELp to reload from it.  So both spills and reloads
+     are fine-grain operations.  In contrast, in the old algorithm
+     "spills" have to be bundled together in records.
+     Ideally, we should sink the spill record construction to where
+     it is needed.  We can even split the spill record into multiple ones
+     at the places where they are needed.  But CPS is not a good
+     representation for global code motion, so I'll keep it simple and
+     am not attempting this.
+. Incremental record construction (aka record splitting).
+     Long records with many component values which are simulatenously live
+     (recall that single use record addresses are not considered to
+      be live) are constructed with rawrecord and rawupdate.
+     We allocate space on the heap with rawrecord first, then gradually
+     fill it in with rawupdate.  This is the technique suggested to me
+     by Matthias.
+     Some restrictions on when this is applicable:
+. It is not a VECTOR record.  The code generator currently does not handle
+        this case. VECTOR record uses double indirection like arrays.
+. All the record component values are defined in the same "basic block"
+        as the record constructor.  This is to prevent speculative
+        record construction.
+ ----------------------------------------------------------------------
+ Name: Allen Leung
+ Date: 2002/02/22 01:02:00 EST
+ Tag: leunga-20020222-mlrisc-tools
+ Minor bug fixes in the parser and rewriter
+ ----------------------------------------------------------------------
+ Name: Allen Leung
+ Date: 2002/02/21 20:20:00 EST
+ Tag: leunga-20020221-peephole
+ Regenerated the peephole files.  Some contained typos in the specification
+ and some didn't compile because of pretty printing bugs in the old version
+ of 'nowhere'.
+ ----------------------------------------------------------------------
+ Name: Allen Leung
+ Date: 2002/02/19 20:20:00 EST
+ Tag: leunga-20020219-mlrisc-tools
+ Description:
+    Minor bug fixes to the mlrisc-tools library:
+.  Fixed up parsing colon suffixed keywords
+.  Added the ability to shut the error messages up
+.  Reimplemented the pretty printer and fixed up/improved
+        the pretty printing of handle and -> types.
+.  Fixed up generation of literal symbols in the nowhere tool.
+.  Added some SML keywords to to sml.sty
+ ----------------------------------------------------------------------
+ Name: Matthias Blume
+ Date: 2002/02/19 16:20:00 EST
+ Tag: blume-20020219-cmffi
+ Description:
+ A wild mix of changes, some minor, some major:
+ * All C FFI-related libraries are now anchored under $c:
+     $/c.cm      --> $c/c.cm
+     $/c-int.cm  --> $c/internals/c-int.cm
+     $/memory.cm --> $c/memory/memory.cm
+ * "make" tool (in CM) now treats its argument pathname slightly
+   differently:
+. If the native expansion is an absolute name, then before invoking
+        the "make" command on it, CM will apply OS.Path.mkRelative
+        (with relativeTo = OS.FileSys.getDir()) to it.
+. The argument will be passed through to subsequent phases of CM
+        processing without "going native".  In particular, if the argument
+        was an anchored path, then "make" will not lose track of that anchor.
+ * Compiler backends now "know" their respective C calling conventions
+   instead of having to be told about it by ml-nlffigen.  This relieves
+   ml-nlffigen from one of its burdens.
+ * The X86Backend has been split into X86CCallBackend and X86StdCallBackend.
+ * Export C_DEBUG and C_Debug from $c/c.cm.
+ * C type encoding in ml-nlffi-lib has been improved to model the conceptual
+   subtyping relationship between incomplete pointers and their complete
+   counterparts.  For this, ('t, 'c) ptr has been changed to 'o ptr --
+   with the convention of instantiating 'o with ('t, 'c) obj whenever
+   the pointer target type is complete.  In the incomplete case, 'o
+   will be instantiated with some "'c iobj" -- a type obtained by
+   using one of the functors PointerToIncompleteType or PointerToCompleteType.
+   Operations that work on both incomplete and complete pointer types are
+   typed as taking an 'o ptr while operations that require the target to
+   be known are typed as taking some ('t, 'c) obj ptr.
+   voidptr is now a bit "more concrete", namely "type voidptr = void ptr'"
+   where void is an eqtype without any values.  This makes it possible
+   to work on voidptr values using functions meant to operate on light
+   incomplete pointers.
+ * As a result of the above, signature POINTER_TO_INCOMPLETE_TYPE has
+   been vastly simplified.
+ ----------------------------------------------------------------------
+ Name: Matthias Blume
+ Date: 2002/02/19 10:48:00 EST
+ Tag: blume-20020219-pqfix
+ Description:
+ Applied Chris Okasaki's bug fix for priority queues.
+ ----------------------------------------------------------------------
+ Name: Matthias Blume
+ Date: 2002/02/15 17:05:00
+ Tag: Release_110_39
+ Description:
+ Last-minute retagging is becoming a tradition... :-(
+ This is the working release 110.39.
+ ----------------------------------------------------------------------
+ Name: Matthias Blume
+ Date: 2002/02/15 16:00:00 EST
+ Tag: Release_110_39-orig
+ Description:
+ Working release 110.39.  New bootfiles.
+ (Update: There was a small bug in the installer so it wouldn't work
+ with all shells.  So I retagged. -Matthias)
+ ----------------------------------------------------------------------
+ Name: Matthias Blume
+ Date: 2002/02/15 14:17:00 EST
+ Tag: blume-20020215-showbindings
+ Description:
+ Added EnvRef.listBoundSymbols and CM.State.showBindings.  Especially
+ the latter can be useful for exploring what bindings are available at
+ the interactive prompt.  (The first function returns only the list
+ of symbols that are really bound, the second prints those but also the
+ ones that CM's autoloading mechanism knows about.)
+ ----------------------------------------------------------------------
+ Name: Matthias Blume
+ Date: 2002/02/15 12:08:00 EST
+ Tag: blume-20020215-iptrs
+ Description:
+ Two improvements to ml-nlffigen:
+. Write files only if they do not exist or if their current contents
+      do not coincide with what's being written.  (That is, avoid messing
+      with the time stamps unless absolutely necessary.)
+. Implement a "repository" mechanism for generated files related
+      to "incomplete pointer types".   See the README file for details.
+ ----------------------------------------------------------------------
+ Name: Matthias Blume
+ Date: 2002/02/14 11:50:00 EST
+ Tag: blume-20020214-quote
+ Description:
+ Added a type 't t_' to tag.sml (in ml-nlffi-lib.cm).  This is required
+ because of the new and improved tag generation scheme.  (Thanks to Allen
+ Leung for pointing it out.)
+ ----------------------------------------------------------------------
+ Name: Lal George
+ Date: 2002/02/14 09:55:27 EST 2002
+ Tag: george-20020214-isabelle-bug
+ Description:
+ Fixed the MLRISC bug sent by Markus Wenzel regarding the compilation
+ of Isabelle on the x86.
+ From Allen:
+ -----------
+  I've found the problem:
+      in ra-core.sml, I use the counter "blocked" to keep track of the
+      true number of elements in the freeze queue.  When the counter goes
+      to zero, I skip examining the queue.  But I've messed up the
+      bookkeeping in combine():
+          else ();
+          case !ucol of
+            PSEUDO => (if !cntv > 0 then
+                  (if !cntu > 0 then blocked := !blocked - 1 else ();
+                                     ^^^^^^^^^^^^^^^^^^^^^^^
+                   moveu := mergeMoveList(!movev, !moveu)
+                  )
+               else ();
+      combine() is called to coalesce two nodes u and v.
+      I think I was thinking that if the move counts of u and v are both
+      greater than zero then after they are coalesced then one node is
+      removed from the freeze queue.  Apparently I was thinking that
+      both u and v are of low degree, but that's clearly not necessarily true.
+/12/2002:
+     Here's the patch.  HOL now compiles.
+     I don't know how this impact on performance (compile
+     time or runtime).  This bug caused the RA (especially on the x86)
+     to go thru the potential spill phase when there are still nodes on the
+     freeze queue.
+ ----------------------------------------------------------------------
+ Name: Matthias Blume
+ Date: 2002/02/13 22:40:00 EST
+ Tag: blume-20020213-fptr-rtti
+ Description:
+ Fixed a bug in ml-nlffigen that was introduced with one of the previous
+ updates.
+ ----------------------------------------------------------------------
+ Name: Matthias Blume
+ Date: 2002/02/13 16:41:00 EST
+ Tag: blume-20020213-cmlpq
+ Description:
+ Added new priority queue export symbols (which have just been added to
+ smlnj-lib.cm) to CML's version of smlnj-lib.cm.  (Otherwise CML would
+ not compile and the installer would choke.)
+ ----------------------------------------------------------------------
+ Name: Matthias Blume
+ Date: 2002/02/13 16:15:00 EST
+ Tag: blume-20020213-various
+ Description:
+. More tweaks to ml-nlffigen:
+    - better internal datastructures (resulting in slight speedup)
+    - "-match" option requires exact match
+    - "localized" gensym counters (untagged structs/unions nested within
+      other structs/unions or within typedefs get a fresh counter; their
+      tag will be prefixed by a concatenation of their parents' tags)
+    - bug fixes (related to calculation of transitive closure of types
+      to be included in the output)
+. Minor Basis updates:
+    - added implementations for List.collate and Option.app
+ ----------------------------------------------------------------------
+ Name: Matthias Blume
+ Date: 2002/02/11 15:55:00 EST
+ Tag: blume-20020211-gensym
+ Description:
+ Added a "-gensym" option to command line of ml-nlffigen.  This can be
+ used to specify a "stem" -- a string that is inserted in all "gensym'd"
+ names (ML structure names that correspond to unnamed C structs, unions,
+ and enums), so that separate runs of ml-nlffigen do not clash.
+ ----------------------------------------------------------------------
+ Name: Matthias Blume
+ Date: 2002/02/11 12:05:00 EST
+ Tag: blume-20020211-gensml
+ Description:
+ A quick fix for a problem with GenSML (in the pgraph-util library):
+ Make generation of toplevel "local" optional.  (Strictly speaking,
+ signature definitions within "local" are not legal SML.)
+ Other than that: updates to INSTALL and cm/TODO.
+ ----------------------------------------------------------------------
+ Name: Matthias Blume
+ Date: 2002/02/08 15:00:00 EST
+ Tag: blume-20020208-uniquepid
+ Description:
+. Version number has been bumped to 110.38.1.  NEW BOOTFILES!!!
+. The installer (config/install.sh) has gotten smarter:
+      - Configuration options are a bit easier to specify now
+        (in config/targets).
+      - Bug in recognizing .tar.bz2 files fixed.
+      - Installer automatically resolves dependencies between
+        configuration options (e.g., if you ask for eXene, you will
+        also get cml -- regardless whether you asked for it or not).
+      - Installer can run in "quieter mode" by setting the environment
+        variable INSTALL_QUIETLY to "true".  "Quieter" does not mean
+        "completely silent", though.
+      - Build HashCons library as part of smlnj-lib.
+. A new scheme for assigning persistent identifiers to compilation
+    units (and, by extension, to types etc.) has been put into place.
+    This fixes a long-standing bug where types and even dynamic values
+    can get internally confused, thereby compromising type safety
+    (abstraction) and dynamic correctness.  See
+      http://cm.bell-labs.com/cm/cs/who/blume/pid-confusion.tgz
+    for an example of how things could go wrong until now.
+    The downside of the new scheme is that pids are not quite as
+    persistent as they used to be: CM will generate a fresh pid
+    for every compilation unit that it thinks it sees for the first
+    time.  That means that if you compile starting from a clean, fresh
+    source tree at two different times, you end up with different
+    binaries.
+    Cutoff recompilation, however, has not been compromised because
+    CM keeps pid information in special caches between runs.
+ ----------------------------------------------------------------------
+ Name: Lal George
+ Date: 2002/02/07 15:34:13 EST 2002
+ Tag: <none>
+ Description:
+ Compilers that generate assembly code may produce  global labels
+ whose value is resolved at link time. The various peephole optimization
+ modules did not take this in account.
+ TODO. The Labels.addrOf function should really return an option
+ type so that clients are forced to deal with this issue, rather
+ than an exception being raised.
+ ----------------------------------------------------------------------
+ Name: Lal George
+ Date: 2002/02/06 13:55:02 EST
+ Tag: george-20020206-ra-breakup
+ Description:
+. A bug fix from Allen.
+     A typo causes extra fstp %st(0)'s to be generated at compensation
+     edges, which might cause stack underflow traps at runtime.  This
+     occurs in fft where there are extraneous fstps right before the 'into'
+     trap instruction (in this case they are harmless since none of the
+     integers overflow.)
+. Pulled out various utility modules that were embedded in the modules
+    of the register allocator. I need these modules for other purposes, but
+    they are not complete enough to put into a library (just yet).
+ ----------------------------------------------------------------------
+ Name: Matthias Blume
+ Date: 2002/01/31 16:05:00 EST
+ Tag: blume-20020131-sparc-ccalls
+ Description:
+. C-calls on Sparc needlessly allocated a huge chunk (96 bytes)
+    of extra stack space by mistake.  Fixed.
+. Bug in logic of handling of command-line options in ml-nlffigen fixed.
+ ----------------------------------------------------------------------
+ Name: Allen Leung
+ Date: 2002/01/30
+ Tag: leunga-20020130-nowhere-bug-fix
+ Description:
+    MLRISC bug fixes:
+. Fixed a bindings computation bug in the 'nowhere' program generator tool.
+. MachineInt.fromString was negating its value.
+ ----------------------------------------------------------------------
+ Name: Matthias Blume
+ Date: 2002/01/29
+ Tag: blume-20020129-INSTALL
+ Description:
+ - Added somewhat detailed installation instructions (file INSTALL).
+ - Fixed curl-detection bug in config/install.sh.
+ - It is now possible to select the URL getter using the URLGETTER
+   environment variable:
+       not set / "unknown"      --> automatic detection (script tries wget,
+                                    curl, and lynx)
+       "wget" / "curl" / "lynx" --> use the specified program (script "knows"
+                                    how to properly invoke them)
+       other                    --> use $URLGETTER directly, it must take
+                                    precisely two command-line arguments
+                                    (source URL and destination file name)
+ ----------------------------------------------------------------------
+ Name: Matthias Blume
+ Date: 2002/01/28
+ Tag: blume-20020128-sparc-ccalls
+ Description:
+ - Fixed problem with calculation of "used" registers in sparc-c-calls.
+ - Make use of the allocParam argument in sparc-c-calls.
+ ----------------------------------------------------------------------
+ Name: Matthias Blume
+ Date: 2002/01/28
+ Tag: blume-20020128-allocParam
+ Description:
+ John Reppy:  Changes c-calls API to accept client-callback for
+ allocating extra stack space.
+ me: Corresponding changes to mlriscGen (using a dummy argument that
+     does not change the current behavior).
+ ----------------------------------------------------------------------
+ Name: Matthias Blume
+ Date: 2002/01/28 12:00:00
+ Tag: Release_110_38
+ Description:
+ This time for real!!!
+ ----------------------------------------------------------------------
+ Name: Matthias Blume
+ Date: 2002/01/28 10:56:00 EST
+ Tag: blume-20020128-retraction
+ Description:
+. Retracted earlier 110.38.  (The Release_110_38 tag has been replaced
+    with blume-Release_110_38-retracted.)
+. Fixed a problem with incorrect rounding modes in real64.sml.
+    (Thanks to Andrew Mccreight <andrew.mccreight@yale.edu>.)
+. A bug in ml-nlffigen related to the handling of unnamed structs, unions,
+    and enums fixed.  The naming of corresponding ML identifiers should
+    now be consistent again.
+ ----------------------------------------------------------------------
+ Name: Allen Leung
+ Date: 2002/01/27
+ Tag: leunga-20020127-nowhere
+ Description:
+    Added a target called nowhere in the configuration scripts.
+    Enabling this will build the MLRISC 'nowhere' tool (for translating
+    programs with where-clauses into legal SML code) during installation.
+ ----------------------------------------------------------------------
+ Name: Matthias Blume
+ Date: 2002/01/25 21:27:00 EST
+ Tag: blume-Release_110_38-retracted
+ Description:
+ Call it a (working) release!  Version is 110.38. Bootfiles are ready.
+ README will be added later.
+ !!! NOTE:  Re-tagged as blume-Release_110_38-retracted. Original tag
+ (Release_110_38) removed.  Reason: Last-minute bug fixes.
+ ----------------------------------------------------------------------
+ Name: Matthias Blume
+ Date: 2002/01/25
+ Tag: blume-20020125-ffi
+ Description:
+ A large number of tweaks and improvements to ml-nlffi-lib and
+ ml-nlffigen:
+    - ML represenation types have been streamlined
+    - getter and setter functions work with concrete values, not abstract
+      ones where possible
+    - ml-nlffigen command line more flexible (see README file there)
+    - some bugs have been fixed (hopefully)
+ ----------------------------------------------------------------------
+ Name: Lal George
+ Date: 2002/01/24
+ Tag: george-20020124-risc-ra-interface
+ Description:
+    There is a dramatic simplification in the interface to the
+    register allocator for RISC architectures as a result of making
+    parallel copy instructions explicit.
+ ----------------------------------------------------------------------
+ Name: Matthias Blume
+ Date: 2002/01/22
+ Tag: blume-20020122-x86-ccalls
+ Description:
+ Bug fix for c-calls on x86 (having to do with how char- and
+ short-arguments are being handled).
+ ----------------------------------------------------------------------
+ Name: Matthias Blume
+ Date: 2002/01/21
+ Tag: blume-20020121-ff
+ Description:
+ Another day of fiddling with the FFI...
+. Bug fix/workaround:  CKIT does not complain about negative array
+    dimensions, so ml-nlffigen has to guard itself against this possibility.
+    (Otherwise a negative dimension would send it into an infinite loop.)
+. Some of the abstract types (light objects, light pointers, most "base"
+    types) in structure C are now eqtypes.
+. Added constructors and test functions for NULL function pointers.
+ ----------------------------------------------------------------------
+ Name: Matthias Blume
+ Date: 2002/01/18
+ Tag: blume-20020118-ready-for-new-release
+ Description:
+ Made config/srcarchiveurl point to a new place.  (Will provide boot
+ files shortly.)
+ Maybe we christen this to be 110.38?
+ ----------------------------------------------------------------------
+ Name: Matthias Blume
+ Date: 2002/01/18
+ Tag: blume-20020118-more-ffifiddle
+ Description:
+ Today's FFI fiddling:
+   - Provided a structure CGetSet with "convenient" versions of C.Get.* and
+     C.Set.* that use concrete (MLRep.*) arguments and results instead
+     of abstract ones.
+   - Provided word-style bit operations etc. for "int" representation
+     types in MLRep.S<Foo>Bitops where <Foo> ranges over Char, Int, Short,
+     and Long.
+ ----------------------------------------------------------------------
+ Name: Matthias Blume
+ Date: 2002/01/18
+ Tag: blume-20020118-use-x86-fp
+ Description:
+ Now that x86-fast-fp seems to be working, I turned it back on again
+ by default.  (Seems to work fine now, even with the FFI.)
+ Other than that, I added some documentation about the FFI to
+ src/ml-nlffigen/README and updated the FFI test examples in
+ src/ml-nlffi-lib/Tests/*.
+ ----------------------------------------------------------------------
+ Name: Allen Leung
+ Date: 2002/01/17
+ Tag: leunga-20020117-x86-fast-fp-call
+ Description:
+. Fixed a problem with handling return fp values when x86's fast fp
+       mode is turned on.
+. Minor pretty printing fix for cellset.  Print %st(0) as %st(0) instead
+       of %f32.
+. Added a constructor INT32lit to the ast of MLRISC tools.
+ ----------------------------------------------------------------------
+ Name: Matthias Blume
+ Date: 2002/01/16
+ Tag: blume-20020116-ffifiddle
+ Description:
+ More fiddling with the FFI interface:
+  - Make constness 'c instead of rw wherever possible.  This eliminates
+    the need for certain explicit coercions.  (However, due to ML's
+    value polymorphism, there will still be many cases where explicit
+    coercions are necessary.  Phantom types are not the whole answer
+    to modeling a subtyping relationship in ML.)
+  - ro/rw coersions for pointers added.  (Avoids the detour through */&.)
+  - "printf" test example added to src/ml-nlffi-lib/Tests.  (Demonstrates
+    clumsy workaround for varargs problem.)
+ ----------------------------------------------------------------------
+ Name: Lal George
+ Date: 2002/01/15
+ Tag: <none>
+ Description:
+. Since COPY instructions are no longer native to the architecture,
+    a generic functor can be used to implement the expandCopies function.
+. Allowed EXPORT and IMPORT pseudo-op declarations to appear inside a
+    TEXT segment.
+ ----------------------------------------------------------------------
+ Name: Matthias Blume
+ Date: 2002/01/15
+ Tag: blume-20020115-ffiupdates
+ Description:
+. Fix for bug resulting in single-precision float values being returned
+    incorrectly from FFI calls.
+. Small modifications to C FFI API:
+     - memory-allocation routines return straight objects (no options)
+       and raise an exception in out-of-memory situations
+     - unsafe extensions to cast between function pointers and pointers
+       from/to ints
+     - added structure C_Debug as an alternative to structure C where
+       pointer-dereferencing (|*| and |*!) always check for null-pointers
+     - added open_lib' to DynLinkage;  open_lib' works like open_lib
+       but also takes a (possibly empty) list of existing library handles
+       that the current library depends on
+ ----------------------------------------------------------------------
+ Name: Matthias Blume
+ Date: 2002/01/10
+ Tag: blume-20020110-newffigen
+ Description:
+. Updates to portable graph code.
+. Major update to ml-nlffigen and ml-nlffi-lib.  Things are much
+    more scalable now so that even huge interfaces such as the one
+    for GTK compile in finite time and space. :-)
+    See src/ml-nlffigen/README for details on what's new.
+ ----------------------------------------------------------------------
+ Name: Lal George
+ Date: 2001/01/09 14:31:35 EST 2002
+ Tag: george-20011206-rm-native-copy
+ Description:
+         Removed the native COPY and FCOPY instructions
+         from all the architectures and replaced it with the
+         explicit COPY instruction from the previous commit.
+         It is now possible to simplify many of the optimizations
+         modules that manipulate copies. This has not been
+         done in this change.
+ ----------------------------------------------------------------------
+ Name: Lal George
+ Date: 2001/12/06 16:50:13 EST 2001
+ Tag: george-20011206-mlrisc-instruction
+ Description:
+ Changed the representation of instructions from being fully abstract
+ to being partially concrete. That is to say:
+   from
+         type instruction
+   to
+         type instr                              (* machine instruction *)
+         datatype instruction =
+             LIVE of {regs: C.cellset, spilled: C.cellset}
+           | KILL of {regs: C.cellset, spilled: C.cellset}
+           | COPYXXX of {k: CB.cellkind, dst: CB.cell list, src: CB.cell list}
+           | ANNOTATION of {i: instruction, a: Annotations.annotation}
+           | INSTR of instr
+ This makes the handling of certain special instructions that appear on
+ all architectures easier and uniform.
+ LIVE and KILL say that a list of registers are live or killed at the
+ program point where they appear. No spill code is generated when an
+ element of the 'regs' field is spilled, but the register is moved to
+ the 'spilled' (which is present, more for debugging than anything else).
+ LIVE replaces the (now deprecated) DEFFREG instruction on the alpha.
+ We used to generate:
+         DEFFREG f1
+         f1 := f2 + f3
+         trapb
+ but now generate:
+         f1 := f2 + f3
+         trapb
+         LIVE {regs=[f1,f2,f3], spilled=[]}
+ Furthermore, the DEFFREG (hack) required that all floating point instruction
+ use all registers mentioned in the instruction. Therefore f1 := f2 + f3,
+ defines f1 and uses [f1,f2,f3]! This hack is no longer required resulting
+ in a cleaner alpha implementation. (Hopefully, intel will not get rid of
+ this architecture).
+ COPYXXX is intended to replace the parallel COPY and FCOPY  available on
+ all the architectures. This will result in further simplification of the
+ register allocator that must be aware of them for coalescing purposes, and
+ will also simplify certain aspects of the machine description that provides
+ callbacks related to parallel copies.
+ ANNOTATION should be obvious, and now INSTR represents the honest to God
+ machine instruction set!
+ The <arch>/instructions/<arch>Instr.sml files define certain utility
+ functions for making porting easier -- essentially converting upper case
+ to lower case. All machine instructions (of type instr) are in upper case,
+ and the lower case form generates an MLRISC instruction. For example on
+ the alpha we have:
+   datatype instr =
+      LDA of {r:cell, b:cell, d:operand}
+    | ...
+   val lda : {r:cell, b:cell, d:operand} -> instruction
+     ...
+ where lda is just (INSTR o LDA), etc.
+ ----------------------------------------------------------------------
+ Name: Matthias Blume
+ Date: 2001/11/22 21:40:00 EST
+ Tag: Release_110_37
+ Description:
+ Release 110.37.  This time for real.
+ ----------------------------------------------------------------------
+ Name: Matthias Blume
+ Date: 2001/11/21 16:35:00 EST
+ Tag: blume-20011121-foot-in-mouth
+ Description:
+ Removed the "Release_110_37" tag because of a serious bug.
+ This will be re-tagged once the bug is fixed.
+ ----------------------------------------------------------------------
+ Name: Matthias Blume
+ Date: 2001/11/21 16:14:00 EST
+ Tag: blume-20011121-forgottenfile
+ Description:
+ Forgot to add a file.  (Just a .tex-file -- part of
+ the CM manual source.)
+ ----------------------------------------------------------------------
+ Name: Matthias Blume
+ Date: 2001/11/21 16:10:00 EST
+ Tag: blume-20011121-invalid_110_37
+ Description:
+ Note: I removed the original tag "Release_110_37" from this commit
+       because we found a serious bug in all non-x86 backends.
+       - Matthias
+. Modifications to the SML/NJ code generator and to the runtime system
+    so that code object name strings are directly inserted into code
+    objects at code generation time.  The only business the runtime system
+    has with this is now to read the name strings on occasions.
+    (The encoding of the name string has also changed somewhat.)
+. CM now implements a simple "set calculus" for specifying export lists.
+    In particular, it is now possible to refer to the export lists of
+    other libraries/groups/sources and form unions as well as differences.
+    See the latest CM manual for details.
+. An separate notion of "proxy" libraries has again be eliminated from
+    CM's model.  (Proxy libraries are now simply a special case of using
+    the export list calculus.)
+. Some of the existing libraries now take advantage of the new set
+    calculus.
+    (Notice that not all libraries have been converted because some
+    of the existing .cm-files are supposed to be backward compatible
+    with 110.0.x.)
+. Some cleanup in stand-alone programs.  (Don't use "exnMessage" -- use
+    "General.exnMessage"!  The former relies on a certain hook to be
+    initialized, and that often does not happen in the stand-alone case.)
+ ----------------------------------------------------------------------
+ Name: Lal George
+ Date: 2001/11/21  13:56:18 EST
+ Tag: george-2001121-pseudo-ops
+ Description:
+   Implemented a complete redesign of MLRISC pseudo-ops. Now there
+   ought to never be any question of incompatabilities with
+   pseudo-op syntax expected by host assemblers.
+   For now, only modules supporting GAS syntax are implemented
+   but more should follow, such as MASM, and vendor assembler
+   syntax, e.g. IBM as, Sun as, etc.
+ ----------------------------------------------------------------------
+ Name: Matthias Blume
+ Date: 2001/11/14 11:52:00 EST
+ Tag: blume-20011114-srcname
+ Description:
+. Routed the name of the current source file to mlriscgen where it
+    should be directly emitted into the code object.  (This last part
+    is yet to be done.)
+. Some cleanup of the pgraph code to make it match the proposal that
+    I put out the other day.  (The proposal notwithstanding, things are
+    still in flux here.)
+ ----------------------------------------------------------------------
+ Name: Lal George
+ Date: 2001/11/14 09:44:04 EST
+ Tag:
+ Description:
+   Fix for a backpatching bug reported by Allen.
+   Because the boundary between short and long span-dependent
+   instructions is +/- 128, there are an astounding number of
+   span-dependent instructions whose size is over estimated.
+   Allen came up with the idea of letting the size of span
+   dependent instructions be non-monotonic, for a maxIter
+   number of times, after which the size must be monotonically
+   increasing.
+   This table shows the number of span-dependent instructions
+   whose size was over-estimated as a function of maxIter, for the
+   file Parse/parse/ml.grm.sml:
+      maxIter            # of instructions:
+                     687
+                     438
+                     198
+                       0
+   In compiling the compiler, there is no significant difference in
+   compilation speed between maxIter=10 and maxIter=40. Actually,
+   my measurements showed that maxIter=40 was a tad faster than
+   maxIter=10! Also 96% of the  files in the compiler reach a fix
+   point within 13 iterations, so fixing maxIter at 40, while high,
+   is okay.
+ ----------------------------------------------------------------------
+ Name: Matthias Blume
+ Date: 2001/10/31 15:25:00 EST
+ Tag: blume-20011031-pgraph
+ Description:
+ CKIT:
+ * Changed the "Function" constructor of type Ast.ctype to carry optional
+   argument identifiers.
+ * Changed the return type of TypeUtil.getFunction accordingly.
+ * Type equality ignores the argument names.
+ * TypeUtil.composite tries to preserve argument names but gives up quickly
+   if there is a mismatch.
+ installation script:
+ * attempts to use "curl" if available (unless "wget" is available as well)
+ CM:
+ * has an experimental implementation of "portable graphs" which I will
+   soon propose as an implementation-independent library format
+ * there are also new libraries $/pgraph.cm and $/pgraph-util.cm
+ NLFFI-LIB:
+ * some cleanup (all cosmetic)
+ NLFFIGEN:
+ * temporarily disabled the mechanism that suppresses ML output for
+   C definitions whose identifiers start with an underscore character
+ * generate val bindings for enum constants
+ * user can request that only one style (light or heavy) is being used;
+   default is to use both (command-line arguments: -heavy and -light)
+ * fixed bug in handling of function types involving incomplete pointers
+ * generate ML entry points that take record arguments (i.e., using
+   named arguments) for C functions that have a prototype with named
+   arguments
+   (see changes to CKIT)
+ ----------------------------------------------------------------------
+ Name: Allen Leung
+ Date: 2001/10/27 20:34:00 EDT
+ Tag: leunga-20011027-x86-fast-fp-call
+ Description:
+    Fixed the bug described in blume-20010920-slowfp.
+    The fix involves
+. generating FCOPYs in FSTP in ia32-svid
+. marking a CALL with the appropriate annotation
+ ----------------------------------------------------------------------
+ Name: Matthias Blume
+ Date: 2001/10/16 11:32:00 EDT
+ Tag: blume-20011016-netbsd
+ Description:
+ Underscore patch from Chris Richards (fixing problem with compiling
+ runtime system under recent NetBSD).
+ ----------------------------------------------------------------------
+ Name: Allen Leung
+ Date: 2001/10/12 17:18:32 EDT 2001
+ Tag: leung-20011012-x86-printflowgraph
+ Description:
+ X86RA now uses a valid (instead of dummy) PrintFlowgraph module.
+ ----------------------------------------------------------------------
+ Name: Lal George
+ Date: 2001/10/11 23:51:34 EDT
+ Tag: george-20011011-too-many-instrs
+ Description:
+ The representation of a program point never expected to see more
+ than 65536 instructions in a basic block!
+ ----------------------------------------------------------------------
+ Name: Lal George
+ Date: 2001/10/09 09:41:37 EDT
+ Tag: george-20011008-mlrisc-labels
+ Description:
+ Changed the machine description files to support printing of
+ local and global labels in assembly code, based on host assembler
+ conventions.
+ ----------------------------------------------------------------------
+ Name: Matthias Blume
+ Date: 2001/09/25 15:25:00 EDT
+ Tag: blume-20010925-exninfo
+ Description:
+ I provided a non-hook implementation of exnName (at the toplevel) and
+ made the "dummy" implementation of exnMessage (at the toplevel) more
+ useful: if nothing gets "hooked in", then at least you are going to
+ see the exception name and a message indicating why you don't see more.
+ [For the time being, programs that need exnMessage and want to use
+ ml-build should either use General.exnMessage (strongly recommended) or
+ refer to structure General at some other point so that CM sees a
+ static dependency.]
+ [Similar remarks go for "print" and "use":  If you want to use their
+ functionality in stand-alone programs generated by ml-build, then use
+ TextIO.output and Backend.Interact.useFile (from $smlnj/compiler.cm).]
+ ----------------------------------------------------------------------
+ Name: Matthias Blume
+ Date: 2001/09/20 17:28:00 EDT
+ Tag: blume-20010920-slowfp
+ Description:
+ Allen says that x86-fast-fp is not safe yet, so I turned it off again...
+ ----------------------------------------------------------------------
+ Name: Matthias Blume
+ Date: 2001/09/20 17:20:00 EDT
+ Tag: blume-20010920-canonicalpaths
+ Description:
+. Updated the BOOT file (something that I forgot to do earlier).
+. Small internal change to CM so that it avoids "/../" in filenames
+    as much as possible (but only where it is safe).
+. Changed config/_run-sml (resulting in a changed bin/.run-sml) so
+    that arguments that contain delimiters are passed through correctly.
+    This change also means that all "special" arguments of the form
+    @SMLxxx... must come first.
+. Changed install script to put relative anchor names for tool commands
+    into pathconfig.
+ ----------------------------------------------------------------------
+ Name: Matthias Blume
+ Date: 2001/09/18 15:35:00 EDT
+ Tag: blume-20010918-readme11036
+ Description:
+ Added README files.
+ ----------------------------------------------------------------------
+ Name: Matthias Blume
+ Date: 2001/09/18 11:45:00 EDT
+ Tag: Release_110_36 (retag)
+ Description:
+ Fixed mistake in config/preloads. Retagged as 110.36.
+ ----------------------------------------------------------------------
+ Name: Matthias Blume
+ Date: 2001/09/18 09:40:00 EDT
+ Tag: Release_110_36_orig (tag changed)
+ Description:
+ New version (110.36).  New bootfiles.
+ ----------------------------------------------------------------------
+ Name: Matthias Blume
+ Date: 2001/09/14 16:15:00 EDT
+ Tag: blume-20010914-x86fastfp
+ Description:
+ John committed some changes that Allen made, in particular a (hopefully)
+ correctly working version of the x86-fp module.
+ I changed the default setting of the Control.MLRISC.getFlag "x86-fast-fp"
+ flag to "true".  Everything seems to compile to a fixpoint ok, and
+ "mandelbrot" speeds up by about 15%.
+ ----------------------------------------------------------------------
+ Name: Matthias Blume
+ Date: 2001/09/13 11:20:00 EDT
+ Tag: blume-20010913-minimal
+ Description:
+. Stefan Monnier's patch to fix a miscompilation problem that
+    was brought to light by John Reppy's work on Moby.
+. Implemented a minimal "structure Compiler" that contains just
+    "version" and "architecture".  The minimal version will be
+    available when the full version is not.  This is for backward-
+    compatibility with code that wants to test Compiler.version.
+ ----------------------------------------------------------------------
+ Name: Matthias Blume
+ Date: 2001/08/28 14:03:00 EDT
+ Tag: blume-20010828-ml-lex
+ Description:
+ Fix for bug 1581, received from Neophytos Michael.
+ ----------------------------------------------------------------------
+ Name: Matthias Blume
+ Date: 2001/08/27 11:20:00 EDT
+ Tag: blume-20010827-readme11035
+ Description:
+ Fleshed out the README file for 110.35.
+ ----------------------------------------------------------------------
+ Name: Matthias Blume
+ Date: 2001/08/24 17:10:00 EDT
+ Tag: Release_110_35
+ Description:
+ New version number (110.35).  New bootfiles.
+ ----------------------------------------------------------------------
+ Name: Lal George
+ Date: 2001/08/24 13:47:18 EDT 2001
+ Tag: george-20010824-MLRISC-graphs
+ Description:
+  removed clusters from MLRISC completely and replaced with graphs.
+ ----------------------------------------------------------------------
+ Name: Matthias Blume
+ Date: 2001/08/23 17:50:00 EDT
+ Tag: blume-20010823-toplevel
+ Description:
+ - some reorganization of the code that implements various kinds of
+   environments in the compiler (static, dynamic, symbolic, combined)
+ - re-implemented the EnvRef module so that evalStream works properly
+   (if the stream contains references to "use", "CM.make", etc.)
+ - cleaned up evalloop.sml and interact.sml (but they need more cleaning)
+ ----------------------------------------------------------------------
+ Name: Matthias Blume
+ Date: 2001/08/20 15:50 EDT
+ Tag: blume20010820-slipup
+ Description:
+ I forgot to commit a few files.  Here they are...
+ ----------------------------------------------------------------------
+ Name: Matthias Blume
+ Date: 2001/08/20 15:35:00 EDT
+ Tag: blume-20010820-debugprof
+ Description:
+ !!!! NEW BOOTFILES !!!!
+ This is another round of reorganizing the compiler sources.  This
+ time the main goal was to factor out all the "instrumentation"
+ passes (for profiling and backtracing) into their own library.
+ The difficulty was to do it in such a way that it does not depend
+ on elaborate.cm but only on elabdata.cm.
+ Therefore there have been further changes to both elaborate.cm and
+ elabdata.cm -- more "generic" things have been moved from the former
+ to the latter.  As a result, I was forced to split the assignment
+ of numbers indicating "primtyc"s into two portions: SML-generic and
+ SML/NJ-specific.  Since it would have been awkward to maintain,
+ I bit the bullet and actually _changed_ the mapping between these
+ numbers and primtycs.  The bottom line of this is that you need
+ a new set of bin- and bootfiles.
+ I have built new bootfiles for all architectures, so doing a fresh
+ checkout and config/install.sh should be all you need.
+ The newly created library's name is
+     $smlnj/viscomp/debugprof.cm
+ and its sources live under
+     src/compiler/DebugProf
+ ----------------------------------------------------------------------
+ Name: Matthias Blume
+ Date: 2001/08/15 17:15:00 EDT
+ Tag: blume-20010815-compreorg
+ Description:
+ This is a first cut at reorganizing the CM libraries that make up the
+ core of the compiler.  The idea is to separate out pieces that could
+ be used independently by tools, e.g., the parser, the typechecker, etc.
+ The current status is a step in this direction, but it is not quite
+ satisfactory yet.  Expect more changes in the future.
+ Here is the current (new) organization...
+     What used to be $smlnj/viscomp/core.cm is now divided into
+     six CM libraries:
+          $smlnj/viscomp/basics.cm
+                        /parser.cm
+                        /elabdata.cm
+                        /elaborate.cm
+                        /execute.cm
+                        /core.cm
+     The CM files for these libraries live under src/system/smlnj/viscomp.
+     All these libraries are proxy libraries that contain precisely
+     one CM library component.  Here are the locations of the components
+     (all within the src/compiler tree):
+          Basics/basics.cm
+          Parse/parser.cm
+          ElabData/elabdata.cm
+          Elaborator/elaborate.cm
+          Execution/execute.cm
+          core.cm
+      [This organization is the same that has been used already
+      for a while for the architecture-specific parts of the visible
+      compiler and for the old version of core.cm.]
+      As you will notice, many source files have been moved from their
+      respective original locations to a new home in one of the above
+      subtrees.
+      The division of labor between the new libraries is the following:
+          basics.cm:
+             - Simple, basic definitions that pertain to many (or all) of
+               the other libraries.
+          parser.cm:
+             - The SML parser, producing output of type Ast.dec.
+             - The type family for Ast is also defined and exported here.
+          elabdata.cm:
+             - The datatypes that describe input and output of the elaborator.
+               This includes types, absyn, and static environments.
+          elaborator.cm:
+             - The SML/NJ type checker and elaborator.
+               This maps an Ast.dec (with a given static environment) to
+               an Absyn.dec (with a new static environment).
+             - This libraries implements certain modules that used to be
+               structures as functors (to remove dependencies on FLINT).
+          execute.cm:
+             - Everything having to do with executing binary code objects.
+             - Dynamic environments.
+          core.cm:
+             - SML/NJ-specific instantiations of the elaborator and MLRISC.
+             - Top-level modules.
+             - FLINT (this should eventually become its own library)
+ Notes:
+ I am not 100% happy with the way I separated the elaborator (and its
+ data structures) from FLINT.  Two instances of the same problem:
+. Data structures contain certain fields that carry FLINT-specific
+        information.  I hacked around this using exn and the property list
+        module from smlnj-lib.  But the fact that there are middle-end
+        specific fields around at all is a bit annoying.
+. The elaborator calculates certain FLINT-related information.  I tried
+        to make this as abstract as I could using functorization, but, again,
+        the fact that the elaborator has to perform calculations on behalf
+        of the middle-end at all is not nice.
+. Having to used exn and property lists is unfortunate because it
+        weakens type checking.  The other alternative (parameterizing
+        nearly *everything*) is not appealing, though.
+ I removed the "rebinding =" warning hack because due to the new organization
+ it was awkward to maintain it.  As a result, the compiler now issues some of
+ these warnings when compiling init.cmi during bootstrap compilation. On
+ the plus side, you also get a warning when you do, for example:
+    val op = = Int32.+
+ which was not the case up to now.
+ I placed "assign" and "deref" into the _Core structure so that the
+ code that deals with the "lazy" keyword can find them there.  This
+ removes the need for having access to the primitive environment
+ during elaboration.
+ ----------------------------------------------------------------------
+ Name: Matthias Blume
+ Date: 2001/08/13
+ Tag: blume-20010813-closures
+ Description:
+ This fix was sent to us by Zhong Shao.  It is supposed to improve the
+ performance of certain loops by avoiding needless closure allocation.
+ ----------------------------------------------------------------------
+ Name: Lal George
+ Date: 2001/07/31 10:03:23 EDT 2001
+ Tag: george-20010731-x86-fmalloc
+ Description: Fixed bug in x86 calls
+     There was a bug where call instructions would mysteriously
+     vanish. The call instruction had to be one that returned
+     a floating point value.
+ ----------------------------------------------------------------------
+ Name: Lal George
+ Date: 2001/07/19 16:36:29 EDT 2001
+ Tag: george-20010719-simple-cells
+ Description:
+ I have dramatically simplified the interface for CELLS in MLRISC.
+ In summary, the cells interface is broken up into three parts:
+. CellsBasis : CELLS_BASIS
+         CellsBasis is a top level structure and common for all
+         architectures.  it contains the definitions of basic datatypes
+         and utility  functions over these types.
+. functor Cells() : CELLS
+         Cells generates an interface for CELLS that incorporates the
+         specific resources on the target architecture, such as the
+         presence of special register classes, their number and size,
+         and various useful substructures.
+. <ARCH>CELLS
+         e.g. SparcCells: SPARCCELLS
+         <ARCH>CELLS usually contains additional bindings for special
+         registers  on the architecture, such as:
+                 val r0 : cell           (* register zero *)
+                 val y : cell            (* Y register *)
+                 val psr : cell          (* processor status register *)
+                 ...
+         The structure returned by applying the Cells functor is opened
+         in this interface.
+ The main implication of all this is that the datatypes for cells is
+ split between CellsBasis and CELLS -- a fairly simple change for user
+ code.
+ In the old scheme the CELLS interface had a definitional binding of
+ the form:
+         signature CELLS = sig
+            structure CellsBasis = CellsBasis
+            ...
+         end
+ With all the sharing constraints that goes on in MLRISC, this old
+ design  quickly leads to errors such as:
+         "structure definition spec inside of sharing ... "
+ and appears to require an unacceptable amount of sharing and where
+ constraint hackery.
+ I think this error message (the interaction of definitional specs and
+ sharing) requires more explanation on our web page.
+ ----------------------------------------------------------------------
+ Name: Matthias Blume
+ Date: 2001/07/19 15:00:00 EDT
+ Tag: blume-20010719-libreorg
+ Description:
+ This update puts together a fairly extensive but straightforward change
+ to the way the libraries that implement the interactive system are
+ organized:
+    The biggest change is the elimination of structure Compiler.  As a
+    replacement for this structure, there is now a CM library
+    (known as $smlnj/compiler.cm or $smlnj/compiler/current.cm)
+    that exports all the substructures of the original structure Compiler
+    directly.  So instead of saying Compiler.Foo.bar one now simply
+    says Foo.bar.  (The CM libraries actually export a collection of
+    structures that is richer than the collection of substructures of
+    structure Compiler.)
+    To make the transition smooth, there is a separate library called
+    $smlnj/compiler/compiler.cm which puts together and exports the
+    original structure Compiler (or at least something very close to it).
+    There are five members of the original structure Compiler
+    that are not exported directly but which instead became members
+    of a new structure Backend (described by signature BACKEND).  These are:
+    structure Profile (: PROFILE), structure Compile (: COMPILE), structure
+    Interact (: INTERACT), structure Machine (: MACHINE), and val
+    architecture (: string).
+    Structure Compiler.Version has become structure CompilerVersion.
+    Cross-compilers for alpha32, hppa, ppc, sparc, and x86 are provided
+    by $smlnj/compiler/<arch>.cm where <arch> is alpha32, hppa, ppc, sparc,
+    or x86, respectively.
+    Each of these exports the same frontend structures that
+    $smlnj/compiler.cm exports.  But they do not have a structure Backend
+    and instead export some structure <Arch>Backend where <Arch> is Alpha32,
+    Hppa, PPC, Sparc, or X86, respectively.
+    Library $smlnj/compiler/all.cm exports the union of the exports of
+    $smlnj/compiler/<arch>.cm
+    There are no structures <Arch>Compiler anymore, use
+    $smlnj/compiler/<arch>.cm instead.
+    Library host-compiler-0.cm is gone.  Instead, the internal library
+    that instantiates CM is now called cm0.cm.  Selection of the host
+    compiler (backend) is no longer done here but. (Responsibility for it
+    now lies with $smlnj/compiler/current.cm.  This seems to be more
+    logical.)
+    Many individual files have been moved or renamed.  Some files have
+    been split into multiple files, and some "dead" files have been deleted.
+ Aside from these changes to library organization, there are also changes
+ to the way the code itself is organized:
+    Structure Binfile has been re-implemented in such a way that it no
+    longer needs any knowledge of the compiler.  It exclusively deals
+    with the details of binfile layout.  It no longer invokes the
+    compiler (for the purpose of creating new prospective binfile
+    content), and it no longer has any knowledge of how to interpret
+    pickles.
+    Structure Compile (: COMPILE) has been stripped down to the bare
+    essentials of compilation.  It no longer deals with linking/execution.
+    The interface has been cleaned up considerably.
+    Utility routines for dealing with linking and execution have been
+    moved into their own substructures.
+    (The ultimate goal of these changes is to provide a light-weight
+    binfile loader/linker (at least for, e.g., stable libraries) that
+    does not require CM or the compiler to be present.)
+ CM documentation has been updated to reflect the changes to library
+ organization.
+ ----------------------------------------------------------------------
+ Name: Matthias Blume
+ Date: 2001/07/10 17:30:00 EDT
+ Tag: Release_110_34
+ Description:
+ Minor tweak to 110.34 (re-tagged):
+   - README.html file added to CVS repository
+   - runtime compiles properly under FreeBSD 3.X and 4.X
+ ----------------------------------------------------------------------
+ Name: Matthias Blume
+ Date: 2001/07/10 17:30:00 EDT
+ Tag: Release_110_34
+ Description:
+ New version number (110.34). New bootfiles.
+ ----------------------------------------------------------------------
  Name: Matthias Blume
  Date: 2001/07/09 16:00:00 EDT
  Tag: blume-20010709-more-varargs
-Line 2570
+Line 4187
       elaborator). There were a lot of changes during my "linkpath" trials
       that could have been reverted to their original state but weren't.
       Please, don't be too harsh on me for messing with this code a bit more
-      than what was strictly necessary...  (I _did_ resist the tempation
+      than what was strictly necessary...  (I _did_ resist the temptation
       of doing any "global reformatting" to avoid an untimely death at
       Dave's hands. :)

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