c-common.h (c_tree_chain_next): New static inline function.

	* c-common.h (c_tree_chain_next): New static inline function.

	* c-decl.c (union lang_tree_node): Use it in chain_next expression.

	* cp-tree.h (union lang_tree_node): Use it in chain_next expression.

From-SVN: r175542

gcc/ChangeLog

 2011-06-27  Jakub Jelinek  <jakub@redhat.com>
 
+	* c-decl.c (union lang_tree_node): Use it in chain_next expression.
+
 	* builtin-types.def (BT_FN_PTR_CONST_PTR_SIZE_VAR): New.
 	* builtins.def (BUILT_IN_ASSUME_ALIGNED): New builtin.
 	* tree-ssa-structalias.c (find_func_aliases_for_builtin_call,

gcc/c-decl.c

@@ -238,7 +238,7 @@ extern char C_SIZEOF_STRUCT_LANG_IDENTIFIER_isnt_accurate
 /* The resulting tree type.  */
 
 union GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
-       chain_next ("CODE_CONTAINS_STRUCT (TREE_CODE (&%h.generic), TS_TYPE_COMMON) ? (union lang_tree_node *) TYPE_NEXT_VARIANT (&%h.generic) : CODE_CONTAINS_STRUCT (TREE_CODE (&%h.generic), TS_COMMON) ? ((union lang_tree_node *) TREE_CHAIN (&%h.generic)) : NULL")))  lang_tree_node
+       chain_next ("(union lang_tree_node *) c_tree_chain_next (&%h.generic)"))) lang_tree_node
  {
   union tree_node GTY ((tag ("0"),
 			desc ("tree_node_structure (&%h)")))

gcc/c-family/ChangeLog

 2011-06-27  Jakub Jelinek  <jakub@redhat.com>
 
+	* c-common.h (c_tree_chain_next): New static inline function.
+
 	* c-common.c (check_builtin_function_arguments): Handle
 	BUILT_IN_ASSUME_ALIGNED.
 

gcc/c-family/c-common.h

@@ -1016,4 +1016,19 @@ extern bool c_omp_sharing_predetermined (tree);
 extern tree c_omp_remap_decl (tree, bool);
 extern void record_types_used_by_current_var_decl (tree);
 
+/* Return next tree in the chain for chain_next walking of tree nodes.  */
+static inline tree
+c_tree_chain_next (tree t)
+{
+  /* TREE_CHAIN of a type is TYPE_STUB_DECL, which is different
+     kind of object, never a long chain of nodes.  Prefer
+     TYPE_NEXT_VARIANT for types.  */
+  if (CODE_CONTAINS_STRUCT (TREE_CODE (t), TS_TYPE_COMMON))
+    return TYPE_NEXT_VARIANT (t);
+  /* Otherwise, if there is TREE_CHAIN, return it.  */
+  if (CODE_CONTAINS_STRUCT (TREE_CODE (t), TS_COMMON))
+    return TREE_CHAIN (t);
+  return NULL;
+}
+
 #endif /* ! GCC_C_COMMON_H */

gcc/cp/ChangeLog

+2011-06-27  Jakub Jelinek  <jakub@redhat.com>
+
+	* cp-tree.h (union lang_tree_node): Use it in chain_next expression.
+
 2011-06-26  Jason Merrill  <jason@redhat.com>
 
 	PR c++/49528

gcc/cp/cp-tree.h

@@ -729,7 +729,7 @@ enum cp_tree_node_structure_enum {
 
 /* The resulting tree type.  */
 union GTY((desc ("cp_tree_node_structure (&%h)"),
-       chain_next ("CODE_CONTAINS_STRUCT (TREE_CODE (&%h.generic), TS_TYPE_COMMON) ? ((union lang_tree_node *) TYPE_NEXT_VARIANT (&%h.generic)) : CODE_CONTAINS_STRUCT (TREE_CODE (&%h.generic), TS_COMMON) ? ((union lang_tree_node *) TREE_CHAIN (&%h.generic)) : NULL"))) lang_tree_node {
+       chain_next ("(union lang_tree_node *) c_tree_chain_next (&%h.generic)"))) lang_tree_node {
   union tree_node GTY ((tag ("TS_CP_GENERIC"),
 			desc ("tree_node_structure (&%h)"))) generic;
   struct template_parm_index_s GTY ((tag ("TS_CP_TPI"))) tpi;