Re: TYPE_VFIELD documentation

[Jim Wilson <wilson at specifixinc dot com>]

Richard Kenner wrote:
>     The @code{TYPE_VFIELD} is a compiler-generated field used to point to
>     virtual function tables.  It may or may not appear on the
>     @code{TYPE_FIELDS} list.  However, back ends should handle the
>     @code{TYPE_VFIELD} just like all the entries on the @code{TYPE_FIELDS}
>     list.

Just a quick glance at the C++ front end turns up the function 
create_vtable_ptr in the file cp/class.c.

So the TYPE_VFIELD is a FIELD_DECL, and this FIELD_DECL may not be on 
the TYPE_FIELDS list.  Grepping through the main sources show that the 
only places that use it are dbxout.c and dwarf2out.c, and they treat it 
just like a singular FIELD_DECL, so emit debug info for it.

Note also that the C front end re-uses TYPE_VFIELD for its own purposes, 
so this doesn't apply.

You should be able to do the same thing with TYPE_METHOD to learn more 
about it.
--
Jim Wilson, GNU Tools Support, http://www.SpecifixInc.com