re PR sanitizer/59437 (ICE in for g++ -S -fvtable-verify=std -fsanitize=null)

	PR sanitizer/59437
	* vtable-verify.c (var_is_used_for_virtual_call_p): Check the
	return value of gimple_call_fn.  Use is_gimple_call/is_gimple_assign
	instead of gimple_code.
testsuite/
	* g++.dg/ubsan/pr59437.C: New test.

From-SVN: r205854

gcc/ChangeLog

+2013-12-10  Marek Polacek  <polacek@redhat.com>
+
+	PR sanitizer/59437
+	* vtable-verify.c (var_is_used_for_virtual_call_p): Check the
+	return value of gimple_call_fn.  Use is_gimple_call/is_gimple_assign
+	instead of gimple_code.
+
 2013-12-10  Maxim Kuvyrkov  <maxim@kugelworks.com>
 
 	* config.gcc (mips*-mti-linux*, mips64*-*-linux*):

gcc/testsuite/ChangeLog

+2013-12-09  Marek Polacek  <polacek@redhat.com>
+
+	PR sanitizer/59437
+	* g++.dg/ubsan/pr59437.C: New test.
+
 2013-12-10  Max Ostapenko  <m.ostapenko@partner.samsung.com>
 
 	* c-c++-common/tsan/thread_leak2.c: `dg-skip-if' removed.

gcc/testsuite/g++.dg/ubsan/pr59437.C

+// { dg-do compile }
+// { dg-options "-fsanitize=null -fvtable-verify=std" }
+// { dg-skip-if "" { *-*-* } { "-flto" } { "" } }
+
+template < typename T > struct A
+{
+  T foo ();
+};
+template < typename T > struct C: virtual public A < T >
+{
+  C & operator<< (C & (C &));
+};
+template < typename T >
+C < T > &endl (C < int > &c)
+{
+  c.foo ();
+  return c;
+}
+C < int > cout;
+void
+fn ()
+{
+  cout << endl;
+}

gcc/vtable-verify.c

@@ -513,10 +513,10 @@ var_is_used_for_virtual_call_p (tree lhs, int *mem_ref_depth)
     {
       gimple stmt2 = USE_STMT (use_p);
 
-      if (gimple_code (stmt2) == GIMPLE_CALL)
+      if (is_gimple_call (stmt2))
         {
           tree fncall = gimple_call_fn (stmt2);
-          if (TREE_CODE (fncall) == OBJ_TYPE_REF)
+          if (fncall && TREE_CODE (fncall) == OBJ_TYPE_REF)
             found_vcall = true;
 	  else
 	    return false;
@@ -527,7 +527,7 @@ var_is_used_for_virtual_call_p (tree lhs, int *mem_ref_depth)
 	                                            (gimple_phi_result (stmt2),
 	                                             mem_ref_depth);
         }
-      else if (gimple_code (stmt2) == GIMPLE_ASSIGN)
+      else if (is_gimple_assign (stmt2))
         {
 	  tree rhs = gimple_assign_rhs1 (stmt2);
 	  if (TREE_CODE (rhs) == ADDR_EXPR