+static oberon_expr_t *
+oberon_make_cc_call(oberon_context_t * ctx, int num_args, oberon_expr_t * list_args)
+{
+ if(num_args < 1)
+ {
+ oberon_error(ctx, "too few arguments");
+ }
+
+ if(num_args > 1)
+ {
+ oberon_error(ctx, "too mach arguments");
+ }
+
+ oberon_expr_t * arg;
+ arg = list_args;
+ oberon_check_src(ctx, arg);
+ oberon_check_const(ctx, arg);
+
+ if(!oberon_is_integer_type(arg -> result))
+ {
+ oberon_error(ctx, "expected integer");
+ }
+
+ /* n >= 0 && n <= 15 */
+
+ oberon_expr_t * cond1;
+ oberon_expr_t * cond2;
+ cond1 = oberon_make_bin_op(ctx, GEQ, arg, oberon_make_integer(ctx, 0));
+ cond2 = oberon_make_bin_op(ctx, LEQ, arg, oberon_make_integer(ctx, 15));
+ return oberon_make_bin_op(ctx, AND, cond1, cond2);
+}
+