[MLton-devel] Re: release of MLton with MLton.Finalizable and _export

[Ken Friis Larsen]

Hi Stephen,

Sorry for taking so long to get back to you, but I only just returned
from vacation.

> I wanted to point you at our latest experimental release of MLton,
> 20030625, available at http://www.mlton.org/experimental/.

Cool.  Because I can't compile MLton from CVS these days.  I get the
following error:

---
  [kfl@vips mlton]$ make
  make all
  make[1]: Entering directory `/home/kfl/programming/ml/mlton'
  make compiler dirs
  make[2]: Entering directory `/home/kfl/programming/ml/mlton'
  make -C /home/kfl/programming/ml/mlton/mlton 
  make[3]: Entering directory `/home/kfl/programming/ml/mlton/mlton'
  rm -f front-end/ml.grm.*
  mlyacc front-end/ml.grm
  1 shift/reduce conflict
  chmod -w front-end/ml.grm.*
  rm -f front-end/ml.lex.sml
  mllex front-end/ml.lex
 
  Number of states = 335
  Number of distinct rows = 221
  Approx. memory size of trans. table = 228072 bytes
  chmod -w front-end/ml.lex.sml
  Compiling mlton (takes a while)
  mlton @MLton  gc-summary -- -host self -verbose 1 -output mlton-compile mlton-stubs.cm
  MLton 20030625 (built Thu Jul  3 14:33:14 2003 on vips)
  MLton starting
     Compile SML starting
        pre codegen starting
        pre codegen raised in 0.06 + 0.00 (0% GC)
     Compile SML raised in 0.06 + 0.00 (0% GC)
  MLton raised in 0.21 + 0.00 (0% GC)
  newIn ../lib/mlton-stubs/int-inf.sml: No such file or directory
---

I guess it is a case of not getting the mlton-stub files updated like
last time.

But the 20030625 snapshot compiles without problems, so no problemo :-)

> This release has the MLton.Finalizable module that we discussed a
> while back.

Meanwhile I've been using it in anger in another project, but I'll get
back to that in an other mail (possibly not until the end of next week). 

> It also includes our latest attempt at providing a facility for
> calling SML from C.  Now in SML you can say
> 
> _export "foo": real * char -> int;
> 
> to export a function "foo" for calling from C.  See the user guide for
> details.

Super cool.

> How goes the mGTK port?

Today, I managed to open my first window with a button using the mlton
port :-)

But I get a strange error as soon as I click the button:

   unhandled exception: Thread.atomicEnd with no atomicBegin

(or if I do anything else that will result in an SML callback being
called).  Any idea what I'm doing wrong, or how to debug this?

If you want to play with the current code I've placed a snapshot here:
        http://www.it.edu/people/kfl/tmp/mini-gtk.tgz
or you can peek in our CVS:
        http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/mgtk/mgtk/mini-gtk

To compile the helloworld example I use the following command:
        mlton -output helloworld -verbose 2 helloworld-mlton.cm \
 -I/home/kfl/programming/ml/mlton-20030625/install/usr/lib/mlton/self/include\
      `pkg-config --cflags gtk+-2.0` mgtk-mlton.c `pkg-config --libs gtk+-2.0`


For the new export functionality I have the following comments and
questions:

  * It is really annoying the exported .h is named the same as the
    first .cm or .sml file.  Because it means that I have to make a
    new mgtk-mlton.c file for each program that uses mgtk.  We would
    like to distribute mgtk as a bunch of .sml files an single .c file
    and a .cm file.  How can we do that?

  * Why do I have to supply the long -I flag with the path to mlton
    myself? (Or perhaps my real question is, am I invoking mlton the
    right way above?)

  * If you search for GValue in MiniGtk-mlton.sml you'll find the
    following code segment:

        type GValues = word
        type GValue = word
                
    I first wrote this as:

        type GValues = MLton.pointer
        type GValue = MLton.pointer

    But then I get the error:

        MiniGtk-mlton.sml:153.10-154.72 
        Error: invalid type for exported function: 
           ((int32 * pointer * pointer * int32) -> unit)
 
    Why?


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