Test shift count for overflow.

From-SVN: r170384

diff --git a/gcc/go/gofrontend/expressions.cc b/gcc/go/gofrontend/expressions.cc
index a073f9dfae9c9d8852e5e6dcf39cda7da57e8e43..3d687a613d472b9f46be4571a3e8aa51651e9bc4 100644 (file)
--- a/gcc/go/gofrontend/expressions.cc
+++ b/gcc/go/gofrontend/expressions.cc
@@ -4434,7 +4434,7 @@ Binary_expression::eval_integer(Operator op, Type* left_type, mpz_t left_val,
     case OPERATOR_LSHIFT:
       {
        unsigned long shift = mpz_get_ui(right_val);
-       if (mpz_cmp_ui(right_val, shift) != 0)
+       if (mpz_cmp_ui(right_val, shift) != 0 || shift > 0x100000)
          {
            error_at(location, "shift count overflow");
            mpz_set_ui(val, 0);