981     if (THREAD->is_lock_owned((address)cur)) {
 982       assert(_recursions == 0, "invariant");
 983       set_owner_from_BasicLock(cur, Self);  // Convert from BasicLock* to Thread*.
 984       _recursions = 0;
 985     } else {
 986       // Apparent unbalanced locking ...
 987       // Naively we'd like to throw IllegalMonitorStateException.
 988       // As a practical matter we can neither allocate nor throw an
 989       // exception as ::exit() can be called from leaf routines.
 990       // see x86_32.ad Fast_Unlock() and the I1 and I2 properties.
 991       // Upon deeper reflection, however, in a properly run JVM the only
 992       // way we should encounter this situation is in the presence of
 993       // unbalanced JNI locking. TODO: CheckJNICalls.
 994       // See also: CR4414101
 995 #ifdef ASSERT
 996       LogStreamHandle(Error, monitorinflation) lsh;
 997       lsh.print_cr("ERROR: ObjectMonitor::exit(): thread=" INTPTR_FORMAT
 998                     " is exiting an ObjectMonitor it does not own.", p2i(THREAD));
 999       lsh.print_cr("The imbalance is possibly caused by JNI locking.");
1000       print_debug_style_on(&lsh);
1001 #endif
1002       assert(false, "Non-balanced monitor enter/exit!");

1003       return;
1004     }
1005   }
1006 
1007   if (_recursions != 0) {
1008     _recursions--;        // this is simple recursive enter
1009     return;
1010   }
1011 
1012   // Invariant: after setting Responsible=null an thread must execute
1013   // a MEMBAR or other serializing instruction before fetching EntryList|cxq.
1014   _Responsible = NULL;
1015 
1016 #if INCLUDE_JFR
1017   // get the owner's thread id for the MonitorEnter event
1018   // if it is enabled and the thread isn't suspended
1019   if (not_suspended && EventJavaMonitorEnter::is_enabled()) {
1020     _previous_owner_tid = JFR_THREAD_ID(Self);
1021   }
1022 #endif

 981     if (THREAD->is_lock_owned((address)cur)) {
 982       assert(_recursions == 0, "invariant");
 983       set_owner_from_BasicLock(cur, Self);  // Convert from BasicLock* to Thread*.
 984       _recursions = 0;
 985     } else {
 986       // Apparent unbalanced locking ...
 987       // Naively we'd like to throw IllegalMonitorStateException.
 988       // As a practical matter we can neither allocate nor throw an
 989       // exception as ::exit() can be called from leaf routines.
 990       // see x86_32.ad Fast_Unlock() and the I1 and I2 properties.
 991       // Upon deeper reflection, however, in a properly run JVM the only
 992       // way we should encounter this situation is in the presence of
 993       // unbalanced JNI locking. TODO: CheckJNICalls.
 994       // See also: CR4414101
 995 #ifdef ASSERT
 996       LogStreamHandle(Error, monitorinflation) lsh;
 997       lsh.print_cr("ERROR: ObjectMonitor::exit(): thread=" INTPTR_FORMAT
 998                     " is exiting an ObjectMonitor it does not own.", p2i(THREAD));
 999       lsh.print_cr("The imbalance is possibly caused by JNI locking.");
1000       print_debug_style_on(&lsh);

1001       assert(false, "Non-balanced monitor enter/exit!");
1002 #endif
1003       return;
1004     }
1005   }
1006 
1007   if (_recursions != 0) {
1008     _recursions--;        // this is simple recursive enter
1009     return;
1010   }
1011 
1012   // Invariant: after setting Responsible=null an thread must execute
1013   // a MEMBAR or other serializing instruction before fetching EntryList|cxq.
1014   _Responsible = NULL;
1015 
1016 #if INCLUDE_JFR
1017   // get the owner's thread id for the MonitorEnter event
1018   // if it is enabled and the thread isn't suspended
1019   if (not_suspended && EventJavaMonitorEnter::is_enabled()) {
1020     _previous_owner_tid = JFR_THREAD_ID(Self);
1021   }
1022 #endif