+ if (callvirt)
+ closed_over_null = tramp_info->invoke_sig->param_count == sig->param_count;
+
+ if (callvirt && !closed_over_null) {
+ /*
+ * The delegate needs to make a virtual call to the target method using its
+ * first argument as the receiver. This is hard to support in full-aot, so
+ * optimize it in some cases if possible.
+ * If the target method is not virtual or is in a sealed class,
+ * the vcall will call it directly.
+ * If the call doesn't return a valuetype, then the vcall uses the same calling
+ * convention as a normal call.
+ */
+ if (((method->klass->flags & TYPE_ATTRIBUTE_SEALED) || !(method->flags & METHOD_ATTRIBUTE_VIRTUAL)) && !MONO_TYPE_ISSTRUCT (sig->ret)) {
+ callvirt = FALSE;
+ enable_caching = FALSE;
+ }
+ }
+