218   }
 219   return true;
 220 }
 221 
 222 void VM_PrintThreads::doit() {
 223   Threads::print_on(_out, true, false, _print_concurrent_locks);
 224 }
 225 
 226 void VM_PrintThreads::doit_epilogue() {
 227   if (_print_concurrent_locks) {
 228     // Release Heap_lock
 229     Heap_lock->unlock();
 230   }
 231 }
 232 
 233 void VM_PrintJNI::doit() {
 234   JNIHandles::print_on(_out);
 235 }
 236 
 237 void VM_PrintMetadata::doit() {
 238   MetaspaceUtils::print_metadata_for_nmt(_out, _scale);
 239 }
 240 
 241 VM_FindDeadlocks::~VM_FindDeadlocks() {
 242   if (_deadlocks != NULL) {
 243     DeadlockCycle* cycle = _deadlocks;
 244     while (cycle != NULL) {
 245       DeadlockCycle* d = cycle;
 246       cycle = cycle->next();
 247       delete d;
 248     }
 249   }
 250 }
 251 
 252 bool VM_FindDeadlocks::doit_prologue() {
 253   if (_concurrent_locks) {
 254     // Make sure AbstractOwnableSynchronizer is loaded
 255     JavaThread* jt = JavaThread::current();
 256     java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(jt);
 257     if (jt->has_pending_exception()) {
 258       return false;

 218   }
 219   return true;
 220 }
 221 
 222 void VM_PrintThreads::doit() {
 223   Threads::print_on(_out, true, false, _print_concurrent_locks);
 224 }
 225 
 226 void VM_PrintThreads::doit_epilogue() {
 227   if (_print_concurrent_locks) {
 228     // Release Heap_lock
 229     Heap_lock->unlock();
 230   }
 231 }
 232 
 233 void VM_PrintJNI::doit() {
 234   JNIHandles::print_on(_out);
 235 }
 236 
 237 void VM_PrintMetadata::doit() {
 238   MetaspaceUtils::print_report(_out, _scale, _flags);
 239 }
 240 
 241 VM_FindDeadlocks::~VM_FindDeadlocks() {
 242   if (_deadlocks != NULL) {
 243     DeadlockCycle* cycle = _deadlocks;
 244     while (cycle != NULL) {
 245       DeadlockCycle* d = cycle;
 246       cycle = cycle->next();
 247       delete d;
 248     }
 249   }
 250 }
 251 
 252 bool VM_FindDeadlocks::doit_prologue() {
 253   if (_concurrent_locks) {
 254     // Make sure AbstractOwnableSynchronizer is loaded
 255     JavaThread* jt = JavaThread::current();
 256     java_util_concurrent_locks_AbstractOwnableSynchronizer::initialize(jt);
 257     if (jt->has_pending_exception()) {
 258       return false;