GIMPLEFE: Handle missing labels in goto statements

gcc/c/

	PR testsuite/80580
	* gimple-parser.c (c_parser_gimple_if_stmt): Check for empty labels.

gcc/testsuite/

	PR testsuite/80580
	* gcc.dg/gimplefe-error-7.c: New test.

From-SVN: r248738

gcc/c/ChangeLog

+2017-05-31  Mikhail Maltsev  <maltsevm@gmail.com>
+
+	PR testsuite/80580
+	* gimple-parser.c (c_parser_gimple_if_stmt): Check for empty labels.
+
 2017-05-30  David Malcolm  <dmalcolm@redhat.com>
 
 	* c-objc-common.c (c_tree_printer): Gain bool and const char **

gcc/c/gimple-parser.c

@@ -1335,9 +1335,14 @@ c_parser_gimple_if_stmt (c_parser *parser, gimple_seq *seq)
     {
       loc = c_parser_peek_token (parser)->location;
       c_parser_consume_token (parser);
+      if (! c_parser_next_token_is (parser, CPP_NAME))
+	{
+	  c_parser_error (parser, "expected label");
+	  return;
+	}
       label = c_parser_peek_token (parser)->value;
-      t_label = lookup_label_for_goto (loc, label);
       c_parser_consume_token (parser);
+      t_label = lookup_label_for_goto (loc, label);
       if (! c_parser_require (parser, CPP_SEMICOLON, "expected %<;%>"))
 	return;
     }
@@ -1359,6 +1364,11 @@ c_parser_gimple_if_stmt (c_parser *parser, gimple_seq *seq)
     {
       loc = c_parser_peek_token (parser)->location;
       c_parser_consume_token (parser);
+      if (! c_parser_next_token_is (parser, CPP_NAME))
+	{
+	  c_parser_error (parser, "expected label");
+	  return;
+	}
       label = c_parser_peek_token (parser)->value;
       f_label = lookup_label_for_goto (loc, label);
       c_parser_consume_token (parser);

gcc/testsuite/ChangeLog

+2017-05-31  Mikhail Maltsev  <maltsevm@gmail.com>
+
+	PR testsuite/80580
+	* gcc.dg/gimplefe-error-7.c: New test.
+
 2017-05-31  Graham Markall  <graham.markall@embecosm.com>
 
 	* gcc.target/arc/add_n-combine.c: New test.

gcc/testsuite/gcc.dg/gimplefe-error-7.c

+/* { dg-do compile } */
+/* { dg-options "-fgimple" } */
+
+__GIMPLE() void fn1()
+{
+  if (1)
+    goto
+  else /* { dg-error "expected label" } */
+    goto lbl;
+}
+
+__GIMPLE() void fn2()
+{
+  if (1)
+    goto lbl;
+  else
+    goto ; /* { dg-error "expected label" } */
+}
+
+__GIMPLE() void fn3()
+{
+  if (1)
+    goto lbl;
+  else
+    goto
+} /* { dg-error "expected label" } */
+