varpool alias reorg

[H.J. Lu]

On Sat, Jun 18, 2011 at 1:32 AM, Jan Hubicka <hubicka@ucw.cz> wrote:
> Hi,
> this patch makes symetric changes to varpool as did the prevoius series to cgraph.
> Basically the aliases are now represented as separate varpool nodes with alias reference
> to the variable they refer to, with some infrastructure to walk the alias references
> as needed.
>
> Bootstrapped/regtested x86_64-linux, comitted.
>
> Honza
>
>        * lto-symtab.c (lto_varpool_replace_node): Remove code handling
>        extra name aliases.
>        (lto_symtab_resolve_can_prevail_p): Likewise.
>        (lto_symtab_merge_cgraph_nodes): Update alias_of pointers.
>        * cgraphbuild.c (record_reference): Remove extra body alias code.
>        (mark_load): Likewise.
>        (mark_store): Likewise.
>        * cgraph.h (varpool_node): Remove extra_name filed;
>        add alias_of and extraname_alias.
>        (varpool_create_variable_alias, varpool_for_node_and_aliases): Declare.
>        (varpool_alias_aliased_node): New inline function.
>        (varpool_variable_node): New function.
>        * cgraphunit.c (handle_alias_pairs): Handle also variable aliases.
>        * ipa-ref.c (ipa_record_reference): Allow aliases on variables.
>        * lto-cgraph.c (lto_output_varpool_node): Update streaming.
>        (input_varpool_node): Likewise.
>        * lto-streamer-out.c (produce_symtab): Remove extra name aliases.
>        (varpool_externally_visible_p): Remove extra body alias code.
>        (function_and_variable_visibility): Likewise.
>        * tree-ssa-structalias.c (associate_varinfo_to_alias_1): New function.
>        (ipa_pta_execute): Use it.
>        * varpool.c (varpool_remove_node): Remove extra name alias code.
>        (varpool_mark_needed_node): Likewise.
>        (varpool_analyze_pending_decls): Analyze aliases.
>        (assemble_aliases): New functoin.
>        (varpool_assemble_decl): Use it.
>        (varpool_create_variable_alias): New function.
>        (varpool_extra_name_alias): Rewrite.
>        (varpool_for_node_and_aliases): New function.

This caused:

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49463

-- 
H.J.