1050 // Flushes compiled methods dependent on a particular CallSite

  1051 // instance when its target is different than the given MethodHandle.

  1052 void CodeCache::flush_dependents_on(Handle call_site, Handle method_handle) {

  1053   assert_lock_strong(Compile_lock);

  1054 

  1055   if (number_of_nmethods_with_dependencies() == 0) return;

  1056 

  1057   // CodeCache can only be updated by a thread_in_VM and they will all be

  1058   // stopped during the safepoint so CodeCache will be safe to update without

  1059   // holding the CodeCache_lock.

  1060 

  1061   CallSiteDepChange changes(call_site(), method_handle());

  1062 

  1063   // Compute the dependent nmethods that have a reference to a

  1064   // CallSite object.  We use InstanceKlass::mark_dependent_nmethod

  1065   // directly instead of CodeCache::mark_for_deoptimization because we

  1066   // want dependents on the call site class only not all classes in

  1067   // the ContextStream.

  1068   int marked = 0;

  1069   {

  1070     MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);

  1071     InstanceKlass* ctxk = MethodHandles::get_call_site_context(call_site());

  1072     if (ctxk == NULL) {

  1073       return; // No dependencies to invalidate yet.

  1074     }

  1075     marked = ctxk->mark_dependent_nmethods(changes);

  1076   }

  1077   if (marked > 0) {

  1078     // At least one nmethod has been marked for deoptimization

  1079     VM_Deoptimize op;

  1080     VMThread::execute(&op);

  1081   }

  1082 }

  1083