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Java Object Header
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| |----------------------------------------------------------------------------------------|--------------------| | |
| | Object Header (64 bits) | State | | |
| |-------------------------------------------------------|--------------------------------|--------------------| | |
| | Mark Word (32 bits) | Klass Word (32 bits) | | | |
| |-------------------------------------------------------|--------------------------------|--------------------| | |
| | identity_hashcode:25 | age:4 | biased_lock:1 | lock:2 | OOP to metadata object | Normal | | |
| |-------------------------------------------------------|--------------------------------|--------------------| | |
| | thread:23 | epoch:2 | age:4 | biased_lock:1 | lock:2 | OOP to metadata object | Biased | | |
| |-------------------------------------------------------|--------------------------------|--------------------| | |
| | ptr_to_lock_record:30 | lock:2 | OOP to metadata object | Lightweight Locked | | |
| |-------------------------------------------------------|--------------------------------|--------------------| | |
| | ptr_to_heavyweight_monitor:30 | lock:2 | OOP to metadata object | Heavyweight Locked | | |
| |-------------------------------------------------------|--------------------------------|--------------------| | |
| | | lock:2 | OOP to metadata object | Marked for GC | | |
| |-------------------------------------------------------|--------------------------------|--------------------| |
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| |------------------------------------------------------------------------------------------------------------|--------------------| | |
| | Object Header (128 bits) | State | | |
| |------------------------------------------------------------------------------|-----------------------------|--------------------| | |
| | Mark Word (64 bits) | Klass Word (64 bits) | | | |
| |------------------------------------------------------------------------------|-----------------------------|--------------------| | |
| | unused:25 | identity_hashcode:31 | unused:1 | age:4 | biased_lock:1 | lock:2 | OOP to metadata object | Normal | | |
| |------------------------------------------------------------------------------|-----------------------------|--------------------| | |
| | thread:54 | epoch:2 | unused:1 | age:4 | biased_lock:1 | lock:2 | OOP to metadata object | Biased | | |
| |------------------------------------------------------------------------------|-----------------------------|--------------------| | |
| | ptr_to_lock_record:62 | lock:2 | OOP to metadata object | Lightweight Locked | | |
| |------------------------------------------------------------------------------|-----------------------------|--------------------| | |
| | ptr_to_heavyweight_monitor:62 | lock:2 | OOP to metadata object | Heavyweight Locked | | |
| |------------------------------------------------------------------------------|-----------------------------|--------------------| | |
| | | lock:2 | OOP to metadata object | Marked for GC | | |
| |------------------------------------------------------------------------------|-----------------------------|--------------------| |
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| |--------------------------------------------------------------------------------------------------------------|--------------------| | |
| | Object Header (96 bits) | State | | |
| |--------------------------------------------------------------------------------|-----------------------------|--------------------| | |
| | Mark Word (64 bits) | Klass Word (32 bits) | | | |
| |--------------------------------------------------------------------------------|-----------------------------|--------------------| | |
| | unused:25 | identity_hashcode:31 | cms_free:1 | age:4 | biased_lock:1 | lock:2 | OOP to metadata object | Normal | | |
| |--------------------------------------------------------------------------------|-----------------------------|--------------------| | |
| | thread:54 | epoch:2 | cms_free:1 | age:4 | biased_lock:1 | lock:2 | OOP to metadata object | Biased | | |
| |--------------------------------------------------------------------------------|-----------------------------|--------------------| | |
| | ptr_to_lock_record | lock:2 | OOP to metadata object | Lightweight Locked | | |
| |--------------------------------------------------------------------------------|-----------------------------|--------------------| | |
| | ptr_to_heavyweight_monitor | lock:2 | OOP to metadata object | Heavyweight Locked | | |
| |--------------------------------------------------------------------------------|-----------------------------|--------------------| | |
| | | lock:2 | OOP to metadata object | Marked for GC | | |
| |--------------------------------------------------------------------------------|-----------------------------|--------------------| |
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