tree-core.h (tree_decl_with_vis): Replace comdat_group by symtab_node pointer.

	* tree-core.h (tree_decl_with_vis): Replace comdat_group by
	symtab_node pointer.
	* tree.c (copy_node_stat): Be sure tonot copy
	symtab_node pointer.
	(find_decls_types_r): Do not walk COMDAT_GROUP.
	* tree.h (DECL_COMDAT_GROUP): Revamp to use decl_comdat_group.
	* varasm.c (make_decl_one_only): Use set_comdat_group;
	create node if needed.
	* ipa-inline-transform.c (save_inline_function_body): Update
	way we decl->symtab mapping.
	* symtab.c (symtab_hash, hash_node, eq_node
	symtab_insert_node_to_hashtable): Remove.
	(symtab_register_node): Update.
	(symtab_unregister_node): Update.
	(symtab_get_node): Reimplement as inline function.
	(symtab_add_to_same_comdat_group): Update.
	(symtab_dissolve_same_comdat_group_list): Update.
	(dump_symtab_base): Update.
	(verify_symtab_base): Update.
	(symtab_make_decl_local): Update.
	(fixup_same_cpp_alias_visibility): Update.
	(symtab_nonoverwritable_alias): Update.
	* cgraphclones.c (set_new_clone_decl_and_node_flags): Update.
	* ipa.c (update_visibility_by_resolution_info): UPdate.
	* bb-reorder.c: Include cgraph.h
	* lto-streamer-out.c (DFS_write_tree_body, hash_tree): Do not deal
	with comdat groups.
	* ipa-comdats.c (set_comdat_group, ipa_comdats): Update.
	* cgraph.c (cgraph_get_create_node): Update.
	* cgraph.h (struct symtab_node): Add get_comdat_group, set_comdat_group
	and comdat_group_.
	(symtab_get_node): Make inline.
	(symtab_insert_node_to_hashtable): Remove.
	(symtab_can_be_discarded): Update.
	(decl_comdat_group): New function.
	* tree-streamer-in.c (lto_input_ts_decl_with_vis_tree_pointers): Update.
	* lto-cgraph.c (lto_output_node, lto_output_varpool_node): Stream out
	comdat group name.
	(read_comdat_group): New function.
	(input_node, input_varpool_node): Use it.
	* trans-mem.c (ipa_tm_create_version_alias): Update code creating
	comdat groups.
	* mips.c (mips_start_unique_function): Likewise.
	(ix86_code_end): Likewise.
	(rs6000_code_end): Likweise.
	* tree-streamer-out.c (DECL_COMDAT_GROUP): Do not stream
	comdat group.

	* lto-symtab.c (lto_symtab_merge_symbols): Update code setting
	symtab pointer.
	* lto.c (compare_tree_sccs_1): Do not compare comdat groups.

	* optmize.c (maybe_thunk_body): Use set_comdat_group.
	(maybe_clone_body): Likewise.
	* decl.c (duplicate_decls): Update code duplicating comdat group;
	do not copy symtab pointer; before freeing newdecl remove it
	from symtab.
	* decl2.c (constrain_visibility): Use set_comdat_group.

	* c-decl.c (merge_decls): Preserve symtab node pointers.
	(duplicate_decls): Free new decl.

From-SVN: r210901

2 files changed, 19 insertions, 1 deletions

diff --git a/gcc/c/ChangeLog b/gcc/c/ChangeLog
index 5bee1ca..dc4a653 100644
--- a/gcc/c/ChangeLog
+++ b/gcc/c/ChangeLog
@@ -1,3 +1,8 @@
+2014-05-23  Jan Hubicka  <hubicka@ucw.cz>
+
+	* c-decl.c (merge_decls): Preserve symtab node pointers.
+	(duplicate_decls): Free new decl.
+
 2014-05-23  Thomas Schwinge  <thomas@codesourcery.com>
 
 	* c-typeck.c (c_finish_omp_clauses): Remove duplicated variable
diff --git a/gcc/c/c-decl.c b/gcc/c/c-decl.c
index 75d1220..e8e6bd2 100644
--- a/gcc/c/c-decl.c
+++ b/gcc/c/c-decl.c
@@ -2507,8 +2507,18 @@ merge_decls (tree newdecl, tree olddecl, tree newtype, tree oldtype)
     switch (TREE_CODE (olddecl))
       {
       case FUNCTION_DECL:
-      case FIELD_DECL:
       case VAR_DECL:
+	{
+	  struct symtab_node *snode = olddecl->decl_with_vis.symtab_node;
+
+	  memcpy ((char *) olddecl + sizeof (struct tree_decl_common),
+		  (char *) newdecl + sizeof (struct tree_decl_common),
+		  tree_code_size (TREE_CODE (olddecl)) - sizeof (struct tree_decl_common));
+	  olddecl->decl_with_vis.symtab_node = snode;
+	  break;
+	}
+
+      case FIELD_DECL:
       case PARM_DECL:
       case LABEL_DECL:
       case RESULT_DECL:
@@ -2561,6 +2571,9 @@ duplicate_decls (tree newdecl, tree olddecl)
     }
 
   merge_decls (newdecl, olddecl, newtype, oldtype);
+
+  /* The NEWDECL will no longer be needed.  */
+  ggc_free (newdecl);
   return true;
 }