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From: Joern Rennecke <amylaar@spamcop.net>
To: Grigori Fursin <grigori.fursin@inria.fr>, 'GCC Mailing List' 	<gcc@gcc.gnu.org>, ctuning-discussions@googlegroups.com
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Subject: target hooks / plugins
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Target hooks would often be interesting for plugins to modify.  And
some proposed new plugin callbacks would also be interesting to have as
target hooks.  Therefore, I would like target hooks to become writeable
by plugins, and make it much easier to add new target hooks in the GCC
sources.

Right now, to make a new target hook, you have to add a new field in
target.h, define a new default in target-def.h, place the new macro
in exactly the right position there of the right initializer macro,
describe the new hook in tm.texi, and if you need a new function with
a bunch of parameters returning a constant, you have to add this to
hooks.c .

I would like to be able to do all this by adding a single entry in a
new definition file; and the information should also be usable by
plugin sources so that they can automatically make wrappers for all
function-type hooks.

Most of the ICI unroll_parameter_handler / graphite_parameter_handler
callbacks can the be made into target hooks.