Hi, I stumbled across this during my work on a gcc compiler plugin [1].
During the ipa-icf pass semantic items (`sem_function` and `sem_variable`) are generated to find potential candidates for function or variable merging.
In `ipa-icf.c` there is a static variable `optimizer` (of type `sem_item_optimizer`) which is initialized before and destroyed after the ipa-icf pass. This variable is used by the semantic items. Therefore it is not possible to use `sem_function` or `sem_variable` outside of the icf pass (as the static optimizer is NULL). E.g. create a `sem_function` variable with `sem_function::parse`.
Is this intended? I would like to use `sem_function` objects (independently from the icf pass) to compare functions that were generated by our gcc plugin (or is this a bad idea).
It seems that (non-static) member functions like `sem_item_optimizer::parse_func_and_vars` use this static `optimizer` instance (through some indirections [2]) which looks kinda wrong to me.
Regards, Flo [1] https://github.com/luhsra/multiverse [2] Calls: sem_item_optimizer::parse_funcs_and_vars [ipa_icf.c:2666] sem_function::parse [ipa_icf.c:1691] sem_function::init [ipa_icf.c:1387] sem_function::hash_stmt [ipa_icf.c:1617] sem_function::add_type [ipa_icf.c:1547] uses static sem_item_optimizer optimzer [ipa_icf.c:94]
