Getting declaration tree node using func. name

[Rohit Arul Raj]

Hi all,

I am working with GCC 4.1.1.
By using the function name, is it possible to get the declaration tree
node of that function.

e.g. using  maybe_get_identifier("name"), i get the identifier node.
similarly are there any functions or macros available to get the
declaration tree node.

Regards,
Rohit