https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101515
--- Comment #5 from qinzhao at gcc dot gnu.org ---
the root cause for this bug is:
1. there is no NAME for the pointer to member function type as the following:
(in cp/decl.cc)
tree
build_ptrmemfunc_type (tree type)
{
....
10655 finish_builtin_struct (t, "__ptrmemfunc_type", fields, ptr_type_node);
10656
10657 /* Zap out the name so that the back end will give us the debugging
10658 information for this anonymous RECORD_TYPE. */
10659 TYPE_NAME (t) = NULL_TREE;
...
}
2. therefore, when printing this ptrmemfun type (which is a RECORD_TYPE), we
should consider that it might not have a TYPE_NAME, however, in the current
handling "pp_cxx_unqualified_id", the TYPE_NAME is assumed to be non-NULL, this
is not correct.
126 static void
127 pp_cxx_unqualified_id (cxx_pretty_printer *pp, tree t)
128 {
129 enum tree_code code = TREE_CODE (t);
130 switch (code)
...
169 case RECORD_TYPE:
170 case UNION_TYPE:
171 case ENUMERAL_TYPE:
172 case TYPENAME_TYPE:
173 case UNBOUND_CLASS_TEMPLATE:
174 pp_cxx_unqualified_id (pp, TYPE_NAME (t)); ===> the ICE happens here
due to TYPE_NAME is NULL.
