diff options
| author | Jan Hubicka <jh@suse.cz> | 2016-04-16 18:30:48 +0200 |
|---|---|---|
| committer | Jan Hubicka <hubicka@gcc.gnu.org> | 2016-04-16 16:30:48 +0000 |
| commit | f13fe18b5b4881a457c2176214349d322b61e187 (patch) | |
| tree | 4cef7161787b418b3d579ca1e2fc6cd70a647584 /gcc/varpool.c | |
| parent | 06c3ddc04956997f9a45769cf44cc85f013e0245 (diff) | |
re PR c++/70018 (Possible issue around IPO and C++ comdats discovered as pure/const)
PR ipa/70018
* cgraph.c (cgraph_node::get_availability): Add REF parameter.
(cgraph_node::function_symbol): Likewise.
(cgraph_node::function_or_virtual_thunk_symbol): Likewise.
* cgraph.h (symtab_node::get_availabbility): Add REF parameter.
(symtab_node::ultimate_alias_target): Add REF parameter.
(symtab_node::binds_to_current_def_p): Declare.
(symtab_node;:ultimate_alias_target_1): Add REF parameter.
(cgraph_node::function_symbol): Likewise.
(cgraph_node::function_or_virtual_thunk_symbol): Likewise.
(cgraph_node::get_availability): Likewise.
(cgraph_edge::binds_to_current_def_p): New inline function.
(varpool_node::get_availability): Add REF parameter.
(varpool_node::ultimate_alias_target): Likewise.
* symtab.c (symtab_node::ultimate_alias_target_1): Likewise.
(symtab_node::binds_to_current_def_p): Likewise.
* varpool.c (varpool_node::get_availability): Likewise.
From-SVN: r235063
Diffstat (limited to 'gcc/varpool.c')
| -rw-r--r-- | gcc/varpool.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/gcc/varpool.c b/gcc/varpool.c index cbbdda41369..12696a4faaa 100644 --- a/gcc/varpool.c +++ b/gcc/varpool.c @@ -482,7 +482,7 @@ varpool_node::add (tree decl) /* Return variable availability. See cgraph.h for description of individual return values. */ enum availability -varpool_node::get_availability (void) +varpool_node::get_availability (symtab_node *ref) { if (!definition) return AVAIL_NOT_AVAILABLE; @@ -495,9 +495,16 @@ varpool_node::get_availability (void) { enum availability avail; - ultimate_alias_target (&avail); + ultimate_alias_target (&avail, ref); return avail; } + /* If this is a reference from symbol itself and there are no aliases, we + may be sure that the symbol was not interposed by soemthing else because + the symbol itself would be unreachable otherwise. */ + if ((this == ref && !has_aliases_p ()) + || (ref && get_comdat_group () + && get_comdat_group () == ref->get_comdat_group ())) + return AVAIL_AVAILABLE; /* If the variable can be overwritten, return OVERWRITABLE. Takes care of at least one notable extension - the COMDAT variables used to share template instantiations in C++. */ |