[PR 68851] Do not collect thunks in collect_callers

2015-12-15  Martin Jambor  <mjambor@suse.cz>

	PR ipa/68851
	* cgraph.c (collect_callers_of_node_1): Do not collect thunks.
	* cgraph.h (cgraph_node): Change comment of collect_callers.

testsuite/
	* g++.dg/ipa/pr68851.C: New test.

From-SVN: r231648

gcc/ChangeLog

+2015-12-15  Martin Jambor  <mjambor@suse.cz>
+
+	PR ipa/68851
+	* cgraph.c (collect_callers_of_node_1): Do not collect thunks.
+	* cgraph.h (cgraph_node): Change comment of collect_callers.
+
 2015-12-15  Jakub Jelinek  <jakub@redhat.com>
 
 	PR tree-optimization/66688

gcc/cgraph.c

@@ -2592,7 +2592,8 @@ collect_callers_of_node_1 (cgraph_node *node, void *data)
 
   if (avail > AVAIL_INTERPOSABLE)
     for (cs = node->callers; cs != NULL; cs = cs->next_caller)
-      if (!cs->indirect_inlining_edge)
+      if (!cs->indirect_inlining_edge
+	  && !cs->caller->thunk.thunk_p)
         redirect_callers->safe_push (cs);
   return false;
 }

gcc/cgraph.h

@@ -1070,7 +1070,7 @@ public:
   cgraph_edge *get_edge (gimple *call_stmt);
 
   /* Collect all callers of cgraph_node and its aliases that are known to lead
-     to NODE (i.e. are not overwritable).  */
+     to NODE (i.e. are not overwritable) and that are not thunks.  */
   vec<cgraph_edge *> collect_callers (void);
 
   /* Remove all callers from the node.  */

gcc/testsuite/ChangeLog

+2015-12-15  Martin Jambor  <mjambor@suse.cz>
+
+	PR ipa/68851
+	* g++.dg/ipa/pr68851.C: New test.
+
 2015-12-15  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	PR c++/63506

gcc/testsuite/g++.dg/ipa/pr68851.C

+// { dg-do compile }
+// { dg-options "-O3" }
+
+class A;
+class B {
+public:
+  operator A *() const;
+};
+class A {
+public:
+  virtual bool isFormControlElement() const {}
+};
+class C {
+  struct D {
+    B element;
+  };
+  bool checkPseudoClass(const D &, int &) const;
+};
+class F {
+  virtual bool isFormControlElement() const;
+};
+class G : A, F {
+  bool isFormControlElement() const {}
+};
+bool C::checkPseudoClass(const D &p1, int &) const {
+  A &a = *p1.element;
+  a.isFormControlElement();
+  a.isFormControlElement() || a.isFormControlElement();
+}