[PATCH] Don't ICE on invalid array types (PR middle-end/59827)

[Marek Polacek]

We ICE on the following (invalid) testcase, because the DECL_ARG_TYPE
is error_mark_node and useless_type_conversion_p doesn't check that
it operates on a type.

Regtested/bootstrapped on x86_64-linux, ok for trunk/4.8/4.7?

2014-01-15  Marek Polacek  <pola...@redhat.com>

        PR middle-end/59827
        * cgraph.c (gimple_check_call_args): Don't use DECL_ARG_TYPE if
        it is error_mark_node.
testsuite/
        * gcc.dg/pr59827.c: New test.

--- gcc/cgraph.c.mp2    2014-01-15 14:24:53.235255954 +0100
+++ gcc/cgraph.c        2014-01-15 14:52:28.818244290 +0100
@@ -3035,6 +3035,7 @@ gimple_check_call_args (gimple stmt, tre
            break;
          arg = gimple_call_arg (stmt, i);
          if (p == error_mark_node
+             || DECL_ARG_TYPE (p) == error_mark_node
              || arg == error_mark_node
              || (!types_compatible_p (DECL_ARG_TYPE (p), TREE_TYPE (arg))
                  && !fold_convertible_p (DECL_ARG_TYPE (p), arg)))
--- gcc/testsuite/gcc.dg/pr59827.c.mp2  2014-01-15 15:06:47.129210564 +0100
+++ gcc/testsuite/gcc.dg/pr59827.c      2014-01-15 15:09:17.295843068 +0100
@@ -0,0 +1,15 @@
+/* PR middle-end/59827 */
+/* { dg-do compile } */
+
+int
+foo (int p[2][]) /* { dg-error "array type has incomplete element type" } */
+{
+  return p[0][0];
+}
+
+void
+bar (void)
+{
+  int p[2][1];
+  foo (p); /* { dg-error "type of formal parameter 1 is incomplete" } */
+}

        Marek