> The problem is that the references to object C1 and C2 live in
> a hash table, and that although the referenced nodes will be retained
> by the garbage collector, their mapping in int_cst_hash_table is
> deleted by the GC.
This isn't a simple hash table, is it?
> I am not familiar with the details of garbage collection and
> pretty much just try use existing code as a model. Apparently,
> this sequence of statements is insufficient to tell the GC that it should
> mark the integer constants referenced in this hash table as "in use".
>
> static GTY ((if_marked ("tree_map_marked_p"),
> param_is (struct tree_map)))
> htab_t upc_block_factor_for_type;
> [...]
> upc_block_factor_for_type = htab_create_ggc (512, tree_map_hash
> tree_map_eq, 0);
This is a map so it is garbage-collected as a map: if the key isn't marked,
then the value isn't either. Hence 2 questions:
- why using a map and not a simple hash table?
- what is the key and why isn't it marked?
--
Eric Botcazou
