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Re: [gnat] reuse of ASTs already constructed


Picking up an old thread,
http://gcc.gnu.org/ml/gcc/2003-03/msg00281.html


On Tue, 4 Mar 2003, Geert Bosch <bosch at gnat dot com> wrote:
> [...]
> Best would be to first post a design overview,
> before doing a lot of work in order to prevent spending time
> on implementing something that may turn out to have fundamental
> problems.

I've done a little experimenting to get a feel for this.

I've looked at the work done toward the GCC compile server but
decided that I want to concentrate on GNAT trees (whereas the
compile server targets the GNU trees.)

Also I am aiming somewhat lower - not making a separate compile
server process but rather extending gnat1 to handle multiple
files in a single invocation.

The current GNAT code makes a strong assumption that there be
only one main unit, and this Main_Unit be located at index 0 of
Lib.Units.Table (see procedure Lib.Load.Load_Main_Source).

I am currently looking at having each main unit supplied on
the gnat1 command line overwrite the Main_Unit in the Units table.

What do you think of this approach?

The attached patch sets the stage for passing multiple source
files to a single gnat1 invocation. (Beware, this is a rough cut.
Best use "svn diff --diff-cmd diff -x -uw" after applying as
there are many changes that only affect indentation.)

Thanks,

Oliver


Attachment: gnat1_multi_source_compile-0.diff.gz
Description: GNU Zip compressed data


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