I offer this patch with a little trepidation, because while it makes 
more kinds of C++ work with tracepoints, it is also very obviously 
incomplete.  There are additional patches in the pipeline that don't 
merge yet because of other dependencies, but even then there will still 
be holes in coverage.  On the positive side, this is localized to 
bytecode compilation.  I'll hold off on this one for several days, in 
case anyone wants to weigh in.  (If some of it seems familiar, it's 
because I ripped and stripped from the regular eval code.)

Stan

2010-03-11 Stan Shebs  <stan@codesourcery.com>

    * ax-gdb.c: Include cp-support.h.
    (find_field): Remove.
    (gen_primitive_field): New function.
    (gen_struct_ref_recursive): New function.
    (gen_struct_ref): Rewrite to call gen_struct_ref_recursive instead
    of find_field.
    (gen_static_field): New function.
    (gen_struct_elt_for_reference): New.
    (gen_namespace_elt): New.
    (gen_maybe_namespace_elt): New.
    (gen_aggregate_elt_ref): New.
    (gen_expr): Add OP_SCOPE, display opcode name in error message.