2059   // invokespecial always needs a NULL check. invokevirtual where the target is

  2059   // A null check is required here (when there is a receiver) for any of the following cases

  2060   // final or where it's not known whether the target is final requires a NULL check.

  2060   // - invokespecial, always need a null check.

  2061   // Otherwise normal invokevirtual will perform the null check during the lookup

  2061   // - invokevirtual, when the target is final and loaded. Calls to final targets will become optimized

  2062   // logic or the unverified entry point.  Profiling of calls requires that

  2062   //   and require null checking. If the target is loaded a null check is emitted here.

  2063   // the null check is performed in all cases.

  2063   //   If the target isn't loaded the null check must happen after the call resolution. We achieve that

  2064 

  2064   //   by using the target methods unverified entry point (see CompiledIC::compute_monomorphic_entry).

  2065   bool do_null_check = (recv != NULL) &&

  2065   //   (The JVM specification requires that LinkageError must be thrown before a NPE. An unloaded target may

  2066         (code == Bytecodes::_invokespecial || (target->is_loaded() && (target->is_final() || (is_profiling() && profile_calls()))));

  2066   //   potentially fail, and can't have the null check before the resolution.)

  2067 

  2067   // - A call that will be profiled. (But we can't add a null check when the target is unloaded, by the same

  2068   if (do_null_check) {

  2068   //   reason as above, so calls with a receiver to unloaded targets can't be profiled.)

  2069     null_check(recv);

  2069   //

  2070   // Normal invokevirtual will perform the null check during lookup

  2071 

  2072   bool need_null_check = (code == Bytecodes::_invokespecial) ||

  2073       (target->is_loaded() && (target->is_final_method() || (is_profiling() && profile_calls())));

  2074 

  2075   if (need_null_check) {

  2076     if (recv != NULL) {

  2077       null_check(recv);

  2078     }