PR ipa/61886

	* symtab.c (ultimate_transparent_alias_target): New inline function.
	(symbol_table::assembler_names_equal_p): New method; break out from ...
	(symbol_table::decl_assembler_name_equal): ... here.
	(symbol_table::change_decl_assembler_name): Also update names and
	translation links of transparent aliases.
	(symtab_node::dump_base): Dump transparent_alias.
	(symtab_node::verify_base): Implement basic transparent alias
	verification.
	(symtab_node::make_decl_local): Support localization of weakrefs;
	recurse to transparent aliases; set TREE_STATIC.
	(symtab_node::ultimate_alias_target_1): Handle visibility of
	transparent aliases.
	(symtab_node::resolve_alias): New parmaeter transparent; handle
	transparent aliases; recurse to aliases of aliases to fix comdat
	groups.
	(symtab_node::get_partitioning_class): Handle transparent aliases.
	* ipa-visibility.c (cgraph_externally_visible_p,
	varpool_node::externally_visible_p): Visibility of transparent alias
	depends on its target.
	(function_and_variable_visibility): Do not tweak visibility of
	transparent laiases.
	(function_and_variable_visibility): Likewise.
	* ipa.c (symbol_table::remove_unreachable_nodes): Clear
	transparent_alias flag.
	* alias.c (cgraph_node::create_alias, cgraph_node::get_availability):
	Support transparent aliases.
	* cgraph.h (symtab_node): Update prototype of resolve_alias;
	add transparent_alias flag.
	(symbol_table: Add assembler_names_equal_p.
	(symtab_node::real_symbol_p): Skip transparent aliases.
	* cgraphunit.c (cgraph_node::reset): Reset transparent_alias flag.
	(handle_alias_pairs): Set transparent_alias for weakref.
	(cgraph_node::assemble_thunks_and_aliases): Do not asemble transparent
	aliases.
	* lto-cgraph.c (lto_output_node): When outputting same_comdat_group
	skip symbols not put into boundary; stream transparent_alias.
	(lto_output_varpool_node): Likewise.
	(input_overwrite_node, input_varpool_node): Stream transparent alias.
	* varpool.c (ctor_for_folding, varpool_node::get_availability,
	varpool_node::assemble_aliases,
	symbol_table::remove_unreferenced_decls): Handle transparent aliase.
	(varpool_node::create_alias): Set transparent_alias.

	* lto-partition.c (add_symbol_to_partition_1, contained_in_symbol,
	rename_statics, rename_statics): Handle transparent aliases.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@231373 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 15 insertions, 10 deletions

diff --git a/gcc/cgraphunit.c b/gcc/cgraphunit.c
index 4ab64147e88..3d86c36488e 100644
--- a/gcc/cgraphunit.c
+++ b/gcc/cgraphunit.c
@@ -369,6 +369,7 @@ cgraph_node::reset (void)
   analyzed = false;
   definition = false;
   alias = false;
+  transparent_alias = false;
   weakref = false;
   cpp_implicit_alias = false;
 
@@ -594,7 +595,7 @@ cgraph_node::analyze (void)
       thunk.alias = NULL;
     }
   if (alias)
-    resolve_alias (cgraph_node::get (alias_target));
+    resolve_alias (cgraph_node::get (alias_target), transparent_alias);
   else if (dispatcher_function)
     {
       /* Generate the dispatcher body of multi-versioned functions.  */
@@ -1254,6 +1255,7 @@ handle_alias_pairs (void)
 	      node->alias_target = p->target;
 	      node->weakref = true;
 	      node->alias = true;
+	      node->transparent_alias = true;
 	    }
 	  alias_pairs->unordered_remove (i);
 	  continue;
@@ -1908,15 +1910,18 @@ cgraph_node::assemble_thunks_and_aliases (void)
   FOR_EACH_ALIAS (this, ref)
     {
       cgraph_node *alias = dyn_cast <cgraph_node *> (ref->referring);
-      bool saved_written = TREE_ASM_WRITTEN (decl);
-
-      /* Force assemble_alias to really output the alias this time instead
-	 of buffering it in same alias pairs.  */
-      TREE_ASM_WRITTEN (decl) = 1;
-      do_assemble_alias (alias->decl,
-			 DECL_ASSEMBLER_NAME (decl));
-      alias->assemble_thunks_and_aliases ();
-      TREE_ASM_WRITTEN (decl) = saved_written;
+      if (!alias->transparent_alias)
+	{
+	  bool saved_written = TREE_ASM_WRITTEN (decl);
+
+	  /* Force assemble_alias to really output the alias this time instead
+	     of buffering it in same alias pairs.  */
+	  TREE_ASM_WRITTEN (decl) = 1;
+	  do_assemble_alias (alias->decl,
+			     DECL_ASSEMBLER_NAME (decl));
+	  alias->assemble_thunks_and_aliases ();
+	  TREE_ASM_WRITTEN (decl) = saved_written;
+	}
     }
 }