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A question about TYPE_ARG_TYPES
- From: Kazu Hirata <kazu at codesourcery dot com>
- To: gcc at gcc dot gnu dot org
- Cc: mark at codesourcery dot com
- Date: Wed, 5 Jul 2006 07:57:34 -0700
- Subject: A question about TYPE_ARG_TYPES
Hi,
I keep finding places in GCC sources that check whether a member of
TYPE_ARG_TYPES is 0. For example,
for (link = TYPE_ARG_TYPES (function_or_method_type);
link && TREE_VALUE (link);
link = TREE_CHAIN (link))
gen_type_die (TREE_VALUE (link), context_die);
Notice that TREE_VALUE (link) is part of the loop condition.
Now, do we ever allow a NULL in TYPE_ARG_TYPES? If so, what does that
mean? My guess is that soneone was trying to be cautious about
encountering a NULL in TYPE_ARG_TYPES. (If that's the case, we should
be using gcc_assert instead.)
Thanks,
Kazu Hirata