Fix IPA CP where it forgot to add a reference in cgraph (PR ipa/71190).

2017-01-20  Martin Liska  <mliska@suse.cz>

	PR ipa/71190
	* cgraph.h (maybe_create_reference): Remove argument and
	update comment.
	* cgraphclones.c (cgraph_node::create_virtual_clone): Remove one
	argument.
	* ipa-cp.c (create_specialized_node): Likewise.
	* symtab.c (symtab_node::maybe_create_reference): Handle
	VAR_DECLs and ADDR_EXPRs and select ipa_ref_use type.

From-SVN: r244687

gcc/ChangeLog

 2017-01-20  Martin Liska  <mliska@suse.cz>
 
+	PR ipa/71190
+	* cgraph.h (maybe_create_reference): Remove argument and
+	update comment.
+	* cgraphclones.c (cgraph_node::create_virtual_clone): Remove one
+	argument.
+	* ipa-cp.c (create_specialized_node): Likewise.
+	* symtab.c (symtab_node::maybe_create_reference): Handle
+	VAR_DECLs and ADDR_EXPRs and select ipa_ref_use type.
+
+2017-01-20  Martin Liska  <mliska@suse.cz>
+
 	* read-rtl-function.c (function_reader::create_function): Use
 	build_decl instread of build_decl_stat.
 

gcc/cgraph.h

@@ -131,11 +131,9 @@ public:
 			     enum ipa_ref_use use_type, gimple *stmt);
 
   /* If VAL is a reference to a function or a variable, add a reference from
-     this symtab_node to the corresponding symbol table node.  USE_TYPE specify
-     type of the use and STMT the statement (if it exists).  Return the new
+     this symtab_node to the corresponding symbol table node.  Return the new
      reference or NULL if none was created.  */
-  ipa_ref *maybe_create_reference (tree val, enum ipa_ref_use use_type,
-				   gimple *stmt);
+  ipa_ref *maybe_create_reference (tree val, gimple *stmt);
 
   /* Clone all references from symtab NODE to this symtab_node.  */
   void clone_references (symtab_node *node);

gcc/cgraphclones.c

@@ -624,7 +624,7 @@ cgraph_node::create_virtual_clone (vec<cgraph_edge *> redirect_callers,
       || in_lto_p)
     new_node->unique_name = true;
   FOR_EACH_VEC_SAFE_ELT (tree_map, i, map)
-    new_node->maybe_create_reference (map->new_tree, IPA_REF_ADDR, NULL);
+    new_node->maybe_create_reference (map->new_tree, NULL);
 
   if (ipa_transforms_to_apply.exists ())
     new_node->ipa_transforms_to_apply

gcc/ipa-cp.c

@@ -3786,7 +3786,7 @@ create_specialized_node (struct cgraph_node *node,
 					 args_to_skip, "constprop");
   ipa_set_node_agg_value_chain (new_node, aggvals);
   for (av = aggvals; av; av = av->next)
-    new_node->maybe_create_reference (av->value, IPA_REF_ADDR, NULL);
+    new_node->maybe_create_reference (av->value, NULL);
 
   if (dump_file && (dump_flags & TDF_DETAILS))
     {

gcc/symtab.c

@@ -588,18 +588,25 @@ symtab_node::create_reference (symtab_node *referred_node,
   return ref;
 }
 
-/* If VAL is a reference to a function or a variable, add a reference from
-   this symtab_node to the corresponding symbol table node.  USE_TYPE specify
-   type of the use and STMT the statement (if it exists).  Return the new
-   reference or NULL if none was created.  */
-
 ipa_ref *
-symtab_node::maybe_create_reference (tree val, enum ipa_ref_use use_type,
-				     gimple *stmt)
+symtab_node::maybe_create_reference (tree val, gimple *stmt)
 {
   STRIP_NOPS (val);
-  if (TREE_CODE (val) != ADDR_EXPR)
-    return NULL;
+  ipa_ref_use use_type;
+
+  switch (TREE_CODE (val))
+    {
+    case VAR_DECL:
+      use_type = IPA_REF_LOAD;
+      break;
+    case ADDR_EXPR:
+      use_type = IPA_REF_ADDR;
+      break;
+    default:
+      gcc_assert (!handled_component_p (val));
+      return NULL;
+    }
+
   val = get_base_var (val);
   if (val && VAR_OR_FUNCTION_DECL_P (val))
     {