81
82 TEST_VM(markWord, printing) {
83 JavaThread* THREAD = JavaThread::current();
84 ThreadInVMfromNative invm(THREAD);
85 ResourceMark rm(THREAD);
86
87 oop obj = SystemDictionary::Byte_klass()->allocate_instance(THREAD);
88
89 FlagSetting fs(WizardMode, true);
90 FlagSetting bf(UseBiasedLocking, true);
91
92 HandleMark hm(THREAD);
93 Handle h_obj(THREAD, obj);
94
95 // Biased locking is initially enabled for this java.lang.Byte object.
96 assert_test_pattern(h_obj, "is_biased");
97
98 // Lock using biased locking.
99 BasicObjectLock lock;
100 lock.set_obj(obj);
101 markWord mark = obj->mark().incr_bias_epoch();
102 obj->set_mark(mark);
103 ObjectSynchronizer::fast_enter(h_obj, lock.lock(), true, THREAD);
104 // Look for the biased_locker in markWord, not prototype_header.
105 #ifdef _LP64
106 assert_not_test_pattern(h_obj, "mark(is_biased biased_locker=0x0000000000000000");
107 #else
108 assert_not_test_pattern(h_obj, "mark(is_biased biased_locker=0x00000000");
109 #endif
110
111 // Same thread tries to lock it again.
112 {
113 ObjectLocker ol(h_obj, THREAD);
114 assert_test_pattern(h_obj, "locked");
115 }
116
117 // This is no longer biased, because ObjectLocker revokes the bias.
118 assert_test_pattern(h_obj, "is_neutral no_hash");
119
120 // Wait gets the lock inflated.
121 {
122 ObjectLocker ol(h_obj, THREAD);
123
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81
82 TEST_VM(markWord, printing) {
83 JavaThread* THREAD = JavaThread::current();
84 ThreadInVMfromNative invm(THREAD);
85 ResourceMark rm(THREAD);
86
87 oop obj = SystemDictionary::Byte_klass()->allocate_instance(THREAD);
88
89 FlagSetting fs(WizardMode, true);
90 FlagSetting bf(UseBiasedLocking, true);
91
92 HandleMark hm(THREAD);
93 Handle h_obj(THREAD, obj);
94
95 // Biased locking is initially enabled for this java.lang.Byte object.
96 assert_test_pattern(h_obj, "is_biased");
97
98 // Lock using biased locking.
99 BasicObjectLock lock;
100 lock.set_obj(obj);
101 markWord prototype_header = obj->klass()->prototype_header();
102 markWord mark = obj->mark();
103 markWord biased_mark = markWord::encode((JavaThread*) THREAD, mark.age(), prototype_header.bias_epoch());
104 obj->set_mark(biased_mark);
105 // Look for the biased_locker in markWord, not prototype_header.
106 #ifdef _LP64
107 assert_not_test_pattern(h_obj, "mark(is_biased biased_locker=0x0000000000000000");
108 #else
109 assert_not_test_pattern(h_obj, "mark(is_biased biased_locker=0x00000000");
110 #endif
111
112 // Same thread tries to lock it again.
113 {
114 ObjectLocker ol(h_obj, THREAD);
115 assert_test_pattern(h_obj, "locked");
116 }
117
118 // This is no longer biased, because ObjectLocker revokes the bias.
119 assert_test_pattern(h_obj, "is_neutral no_hash");
120
121 // Wait gets the lock inflated.
122 {
123 ObjectLocker ol(h_obj, THREAD);
124
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