Enable experimental TSAN support for Ada.

2015-01-05  Bernd Edlinger  <bernd.edlinger@hotmail.de>

        Enable experimental TSAN support for Ada.
        * tsan.c (instrument_expr): Handle VIEW_CONVERT_EXPR.

From-SVN: r219197

gcc/ChangeLog

+2015-01-05  Bernd Edlinger  <bernd.edlinger@hotmail.de>
+
+	Enable experimental TSAN support for Ada.
+	* tsan.c (instrument_expr): Handle VIEW_CONVERT_EXPR.
+
 2015-01-05  Jakub Jelinek  <jakub@redhat.com>
 
 	PR tree-optimization/64494

gcc/tsan.c

@@ -212,6 +212,17 @@ instrument_expr (gimple_stmt_iterator gsi, tree expr, bool is_write)
 		     build_int_cst (TREE_TYPE (expr), bitpos / BITS_PER_UNIT));
       expr_ptr = build_fold_addr_expr (expr);
     }
+  /* We can't call build_fold_addr_expr on a VIEW_CONVERT_EXPR.
+     This can occur in Ada.  */
+  else if (TREE_CODE (expr) == VIEW_CONVERT_EXPR)
+    {
+      align = get_object_alignment (expr);
+      if (align < BITS_PER_UNIT)
+	return false;
+      expr = TREE_OPERAND (expr, 0);
+      gcc_checking_assert (is_gimple_addressable (expr));
+      expr_ptr = build_fold_addr_expr (unshare_expr (expr));
+    }
   else
     {
       align = get_object_alignment (expr);