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src/hotspot/share/runtime/deoptimization.cpp

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1484                                     JavaThread* deoptee_thread, frame& fr, int exec_mode, bool realloc_failures) {
1485   bool relocked_objects = false;
1486   for (int i = 0; i < monitors->length(); i++) {
1487     MonitorInfo* mon_info = monitors->at(i);
1488     if (mon_info->eliminated()) {
1489       assert(!mon_info->owner_is_scalar_replaced() || realloc_failures, "reallocation was missed");
1490       relocked_objects = true;
1491       if (!mon_info->owner_is_scalar_replaced()) {
1492         Handle obj(thread, mon_info->owner());
1493         markWord mark = obj->mark();
1494         if (UseBiasedLocking && mark.has_bias_pattern()) {
1495           // New allocated objects may have the mark set to anonymously biased.
1496           // Also the deoptimized method may called methods with synchronization
1497           // where the thread-local object is bias locked to the current thread.
1498           assert(mark.is_biased_anonymously() ||
1499                  mark.biased_locker() == deoptee_thread, "should be locked to current thread");
1500           // Reset mark word to unbiased prototype.
1501           markWord unbiased_prototype = markWord::prototype().set_age(mark.age());
1502           obj->set_mark(unbiased_prototype);
1503         } else if (exec_mode == Unpack_none) {
1504           if (mark.has_locker() && fr.sp() > (intptr_t*)mark.locker()) {
1505             // With exec_mode == Unpack_none obj may be thread local and locked in
1506             // a callee frame. In this case the bias was revoked before in revoke_for_object_deoptimization().
1507             // Make the lock in the callee a recursive lock and restore the displaced header.
1508             markWord dmw = mark.displaced_mark_helper();
1509             mark.locker()->set_displaced_header(markWord::encode((BasicLock*) NULL));
1510             obj->set_mark(dmw);
1511           }
1512           if (mark.has_monitor()) {
1513             // defer relocking if the deoptee thread is currently waiting for obj
1514             ObjectMonitor* waiting_monitor = deoptee_thread->current_waiting_monitor();
1515             if (waiting_monitor != NULL && waiting_monitor->object() == obj()) {
1516               assert(fr.is_deoptimized_frame(), "frame must be scheduled for deoptimization");
1517               mon_info->lock()->set_displaced_header(markWord::unused_mark());
1518               JvmtiDeferredUpdates::inc_relock_count_after_wait(deoptee_thread);
1519               continue;
1520             }
1521           }
1522         }
1523         BasicLock* lock = mon_info->lock();
1524         ObjectSynchronizer::enter(obj, lock, deoptee_thread);

1484                                     JavaThread* deoptee_thread, frame& fr, int exec_mode, bool realloc_failures) {
1485   bool relocked_objects = false;
1486   for (int i = 0; i < monitors->length(); i++) {
1487     MonitorInfo* mon_info = monitors->at(i);
1488     if (mon_info->eliminated()) {
1489       assert(!mon_info->owner_is_scalar_replaced() || realloc_failures, "reallocation was missed");
1490       relocked_objects = true;
1491       if (!mon_info->owner_is_scalar_replaced()) {
1492         Handle obj(thread, mon_info->owner());
1493         markWord mark = obj->mark();
1494         if (UseBiasedLocking && mark.has_bias_pattern()) {
1495           // New allocated objects may have the mark set to anonymously biased.
1496           // Also the deoptimized method may called methods with synchronization
1497           // where the thread-local object is bias locked to the current thread.
1498           assert(mark.is_biased_anonymously() ||
1499                  mark.biased_locker() == deoptee_thread, "should be locked to current thread");
1500           // Reset mark word to unbiased prototype.
1501           markWord unbiased_prototype = markWord::prototype().set_age(mark.age());
1502           obj->set_mark(unbiased_prototype);
1503         } else if (exec_mode == Unpack_none) {
1504           if (LockingMode == LM_LEGACY && mark.has_locker() && fr.sp() > (intptr_t*)mark.locker()) {
1505             // With exec_mode == Unpack_none obj may be thread local and locked in
1506             // a callee frame. In this case the bias was revoked before in revoke_for_object_deoptimization().
1507             // Make the lock in the callee a recursive lock and restore the displaced header.
1508             markWord dmw = mark.displaced_mark_helper();
1509             mark.locker()->set_displaced_header(markWord::encode((BasicLock*) NULL));
1510             obj->set_mark(dmw);
1511           }
1512           if (mark.has_monitor()) {
1513             // defer relocking if the deoptee thread is currently waiting for obj
1514             ObjectMonitor* waiting_monitor = deoptee_thread->current_waiting_monitor();
1515             if (waiting_monitor != NULL && waiting_monitor->object() == obj()) {
1516               assert(fr.is_deoptimized_frame(), "frame must be scheduled for deoptimization");
1517               mon_info->lock()->set_displaced_header(markWord::unused_mark());
1518               JvmtiDeferredUpdates::inc_relock_count_after_wait(deoptee_thread);
1519               continue;
1520             }
1521           }
1522         }
1523         BasicLock* lock = mon_info->lock();
1524         ObjectSynchronizer::enter(obj, lock, deoptee_thread);
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