root tree gcc

Hi... I am using the front end pinapa (http://greensocs.sourceforge.net/pinapa/doc/html/index.html) and it API has a function to get the tree of body of a method C++: tree method_tree= pinapa::st_process_deco::get(method)->get_gcc_body(); i use the macro DECL_CLASS_CONTEXT to capture the tree o

DERIVED_FROM_P

Hi: I'm using the The intermediate representation used by the C and C++ front ends: http://gcc.gnu.org/onlinedocs/gccint/Trees.html I need know what DERIVED_FROM_P do and How use this... Is there any source code sample? Thanks! -- Humberto