re PR lto/54095 (Unnecessary static variable renaming)

	PR lto/54095
	* cgraph.c (cgraph_make_node_local_1): Se unique_name.
	* cgraph.h (symtab_node_base): Add unique_name.
	* lto-cgraph.c (lto_output_node, lto_output_varpool_node,
	input_overwrite_node, input_varpool_node): Stream unique_name.
	* cgraphclones.c (cgraph_create_virtual_clone,
	cgraph_function_versioning): Set unique_name.
	* ipa.c (function_and_variable_visibility): Set unique_name.

From-SVN: r198710

gcc/ChangeLog

+2013-05-08  Jan Hubicka  <jh@suse.cz>
+
+	PR lto/54095
+	* cgraph.c (cgraph_make_node_local_1): Se unique_name.
+	* cgraph.h (symtab_node_base): Add unique_name.
+	* lto-cgraph.c (lto_output_node, lto_output_varpool_node,
+	input_overwrite_node, input_varpool_node): Stream unique_name.
+	* cgraphclones.c (cgraph_create_virtual_clone,
+	cgraph_function_versioning): Set unique_name.
+	* ipa.c (function_and_variable_visibility): Set unique_name.
+
 2013-05-08  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>
 
 	* gimple-ssa-strength-reduction.c (find_phi_def): Revert former	"fix."

gcc/cgraph.c

@@ -1798,6 +1798,8 @@ cgraph_make_node_local_1 (struct cgraph_node *node, void *data ATTRIBUTE_UNUSED)
 
       node->symbol.externally_visible = false;
       node->local.local = true;
+      node->symbol.unique_name = (node->symbol.resolution == LDPR_PREVAILING_DEF_IRONLY
+				  || node->symbol.resolution == LDPR_PREVAILING_DEF_IRONLY_EXP);
       node->symbol.resolution = LDPR_PREVAILING_DEF_IRONLY;
       gcc_assert (cgraph_function_body_availability (node) == AVAIL_LOCAL);
     }

gcc/cgraph.h

@@ -62,6 +62,8 @@ struct GTY(()) symtab_node_base
   /* Needed variables might become dead by optimization.  This flag
      forces the variable to be output even if it appears dead otherwise.  */
   unsigned force_output : 1;
+  /* True when the name is known to be unique and thus it does not need mangling.  */
+  unsigned unique_name : 1;
 
   /* Ordering of all symtab entries.  */
   int order;

gcc/cgraphclones.c

@@ -324,6 +324,14 @@ cgraph_create_virtual_clone (struct cgraph_node *old_node,
   DECL_STATIC_DESTRUCTOR (new_node->symbol.decl) = 0;
   new_node->clone.tree_map = tree_map;
   new_node->clone.args_to_skip = args_to_skip;
+
+  /* Clones of global symbols or symbols with unique names are unique.  */
+  if ((TREE_PUBLIC (old_decl)
+       && !DECL_EXTERNAL (old_decl)
+       && !DECL_WEAK (old_decl)
+       && !DECL_COMDAT (old_decl))
+      || in_lto_p)
+    new_node->symbol.unique_name = true;
   FOR_EACH_VEC_SAFE_ELT (tree_map, i, map)
     {
       tree var = map->new_tree;
@@ -739,6 +747,13 @@ cgraph_function_versioning (struct cgraph_node *old_version_node,
   new_version_node->symbol.externally_visible = 0;
   new_version_node->local.local = 1;
   new_version_node->lowered = true;
+  /* Clones of global symbols or symbols with unique names are unique.  */
+  if ((TREE_PUBLIC (old_decl)
+       && !DECL_EXTERNAL (old_decl)
+       && !DECL_WEAK (old_decl)
+       && !DECL_COMDAT (old_decl))
+      || in_lto_p)
+    new_version_node->symbol.unique_name = true;
 
   /* Update the call_expr on the edges to call the new version node. */
   update_call_expr (new_version_node);

gcc/ipa.c

@@ -786,6 +786,9 @@ function_and_variable_visibility (bool whole_program)
 	{
 	  gcc_assert (whole_program || in_lto_p
 		      || !TREE_PUBLIC (node->symbol.decl));
+	  node->symbol.unique_name = ((node->symbol.resolution == LDPR_PREVAILING_DEF_IRONLY
+				      || node->symbol.resolution == LDPR_PREVAILING_DEF_IRONLY_EXP)
+				      && TREE_PUBLIC (node->symbol.decl));
 	  symtab_make_decl_local (node->symbol.decl);
 	  node->symbol.resolution = LDPR_PREVAILING_DEF_IRONLY;
 	  if (node->symbol.same_comdat_group)
@@ -861,6 +864,9 @@ function_and_variable_visibility (bool whole_program)
 	{
 	  gcc_assert (in_lto_p || whole_program || !TREE_PUBLIC (vnode->symbol.decl));
 	  symtab_make_decl_local (vnode->symbol.decl);
+	  vnode->symbol.unique_name = ((vnode->symbol.resolution == LDPR_PREVAILING_DEF_IRONLY
+				       || vnode->symbol.resolution == LDPR_PREVAILING_DEF_IRONLY_EXP)
+				       && TREE_PUBLIC (vnode->symbol.decl));
 	  if (vnode->symbol.same_comdat_group)
 	    symtab_dissolve_same_comdat_group_list ((symtab_node) vnode);
 	  vnode->symbol.resolution = LDPR_PREVAILING_DEF_IRONLY;

gcc/lto-cgraph.c

@@ -468,6 +468,7 @@ lto_output_node (struct lto_simple_output_block *ob, struct cgraph_node *node,
   bp_pack_value (&bp, node->local.can_change_signature, 1);
   bp_pack_value (&bp, node->local.redefined_extern_inline, 1);
   bp_pack_value (&bp, node->symbol.force_output, 1);
+  bp_pack_value (&bp, node->symbol.unique_name, 1);
   bp_pack_value (&bp, node->symbol.address_taken, 1);
   bp_pack_value (&bp, node->abstract_and_needed, 1);
   bp_pack_value (&bp, tag == LTO_symtab_analyzed_node
@@ -533,6 +534,7 @@ lto_output_varpool_node (struct lto_simple_output_block *ob, struct varpool_node
   bp = bitpack_create (ob->main_stream);
   bp_pack_value (&bp, node->symbol.externally_visible, 1);
   bp_pack_value (&bp, node->symbol.force_output, 1);
+  bp_pack_value (&bp, node->symbol.unique_name, 1);
   bp_pack_value (&bp, node->finalized, 1);
   bp_pack_value (&bp, node->alias, 1);
   bp_pack_value (&bp, node->alias_of != NULL, 1);
@@ -886,6 +888,7 @@ input_overwrite_node (struct lto_file_decl_data *file_data,
   node->local.can_change_signature = bp_unpack_value (bp, 1);
   node->local.redefined_extern_inline = bp_unpack_value (bp, 1);
   node->symbol.force_output = bp_unpack_value (bp, 1);
+  node->symbol.unique_name = bp_unpack_value (bp, 1);
   node->symbol.address_taken = bp_unpack_value (bp, 1);
   node->abstract_and_needed = bp_unpack_value (bp, 1);
   node->symbol.used_from_other_partition = bp_unpack_value (bp, 1);
@@ -1040,6 +1043,7 @@ input_varpool_node (struct lto_file_decl_data *file_data,
   bp = streamer_read_bitpack (ib);
   node->symbol.externally_visible = bp_unpack_value (&bp, 1);
   node->symbol.force_output = bp_unpack_value (&bp, 1);
+  node->symbol.unique_name = bp_unpack_value (&bp, 1);
   node->finalized = bp_unpack_value (&bp, 1);
   node->alias = bp_unpack_value (&bp, 1);
   non_null_aliasof = bp_unpack_value (&bp, 1);