Fix PR c++/70332 (ICE due to aggregate initialization of NSDMI)

gcc/cp/ChangeLog:

	PR c++/70332
	* pt.c (tsubst_copy) [PARM_DECL]: Handle the use of 'this' in an
	NSDMI that's part of an aggregrate initialization.

gcc/testsuite/ChangeLog:

	PR c++/70332
	* g++.dg/cpp1y/nsdmi-aggr5.C: New test.

From-SVN: r234442

gcc/cp/ChangeLog

+2016-03-23  Patrick Palka  <ppalka@gcc.gnu.org>
+
+	PR c++/70332
+	* pt.c (tsubst_copy) [PARM_DECL]: Handle the use of 'this' in an
+	NSDMI that's part of an aggregrate initialization.
+
 2016-03-23  Jakub Jelinek  <jakub@redhat.com>
 
 	PR c++/70001

gcc/cp/pt.c

@@ -13878,10 +13878,13 @@ tsubst_copy (tree t, tree args, tsubst_flags_t complain, tree in_decl)
 
       if (r == NULL_TREE)
 	{
-	  /* We get here for a use of 'this' in an NSDMI.  */
+	  /* We get here for a use of 'this' in an NSDMI as part of a
+	     constructor call or as part of an aggregate initialization.  */
 	  if (DECL_NAME (t) == this_identifier
-	      && current_function_decl
+	      && ((current_function_decl
 		   && DECL_CONSTRUCTOR_P (current_function_decl))
+		  || (current_class_ref
+		      && TREE_CODE (current_class_ref) == PLACEHOLDER_EXPR)))
 	    return current_class_ptr;
 
 	  /* This can happen for a parameter name used later in a function

gcc/testsuite/ChangeLog

+2016-03-23  Patrick Palka  <ppalka@gcc.gnu.org>
+
+	PR c++/70332
+	* g++.dg/cpp1y/nsdmi-aggr5.C: New test.
+
 2016-03-23  Jakub Jelinek  <jakub@redhat.com>
 
 	PR c++/70001

gcc/testsuite/g++.dg/cpp1y/nsdmi-aggr5.C

+// PR c++/70332
+// { dg-do run { target c++14 } }
+
+template <class T>
+struct C
+{
+ T m;
+ T *n = &m;
+};
+
+C<int> c { };
+
+int
+main ()
+{
+  *c.n = 5;
+  if (c.m != 5)
+    __builtin_abort ();
+
+  C<int> d { 10 };
+  *d.n = *d.n + 1;
+  if (d.m != 11)
+    __builtin_abort ();
+}