Mercurial > jdk8-mips64-public > hotspot / file comparison
comparison: src/share/vm/code/nmethod.hpp
src/share/vm/code/nmethod.hpp
- changeset 2624
- 46a56fac55c7
- parent 2603
- 1b4e6a5d98e0
- child 2625
- 65f880e2869b
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inserted
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| 2623:216d916d5c12 | 2624:46a56fac55c7 |
|---|---|
| 192 | 192 |
| 193 jbyte _scavenge_root_state; | 193 jbyte _scavenge_root_state; |
| 194 | 194 |
| 195 NOT_PRODUCT(bool _has_debug_info; ) | 195 NOT_PRODUCT(bool _has_debug_info; ) |
| 196 | 196 |
| 197 // Nmethod Flushing lock (if non-zero, then the nmethod is not removed) | 197 // Nmethod Flushing lock. If non-zero, then the nmethod is not removed |
| 198 // and is not made into a zombie. However, once the nmethod is made into | |
| 199 // a zombie, it will be locked one final time if CompiledMethodUnload | |
| 200 // event processing needs to be done. | |
| 198 jint _lock_count; | 201 jint _lock_count; |
| 199 | 202 |
| 200 // not_entrant method removal. Each mark_sweep pass will update | 203 // not_entrant method removal. Each mark_sweep pass will update |
| 201 // this mark to current sweep invocation count if it is seen on the | 204 // this mark to current sweep invocation count if it is seen on the |
| 202 // stack. An not_entrant method can be removed when there is no | 205 // stack. An not_entrant method can be removed when there is no |
| 520 | 523 |
| 521 protected: | 524 protected: |
| 522 void flush(); | 525 void flush(); |
| 523 | 526 |
| 524 public: | 527 public: |
| 525 // If returning true, it is unsafe to remove this nmethod even though it is a zombie | 528 // When true is returned, it is unsafe to remove this nmethod even if |
| 526 // nmethod, since the VM might have a reference to it. Should only be called from a safepoint. | 529 // it is a zombie, since the VM or the ServiceThread might still be |
| 530 // using it. | |
| 527 bool is_locked_by_vm() const { return _lock_count >0; } | 531 bool is_locked_by_vm() const { return _lock_count >0; } |
| 528 | 532 |
| 529 // See comment at definition of _last_seen_on_stack | 533 // See comment at definition of _last_seen_on_stack |
| 530 void mark_as_seen_on_stack(); | 534 void mark_as_seen_on_stack(); |
| 531 bool can_not_entrant_be_converted(); | 535 bool can_not_entrant_be_converted(); |
| 687 static int osr_entry_point_offset() { return offset_of(nmethod, _osr_entry_point); } | 691 static int osr_entry_point_offset() { return offset_of(nmethod, _osr_entry_point); } |
| 688 static int entry_bci_offset() { return offset_of(nmethod, _entry_bci); } | 692 static int entry_bci_offset() { return offset_of(nmethod, _entry_bci); } |
| 689 | 693 |
| 690 }; | 694 }; |
| 691 | 695 |
| 692 // Locks an nmethod so its code will not get removed, even if it is a zombie/not_entrant method | 696 // Locks an nmethod so its code will not get removed and it will not |
| 697 // be made into a zombie, even if it is a not_entrant method. After the | |
| 698 // nmethod becomes a zombie, if CompiledMethodUnload event processing | |
| 699 // needs to be done, then lock_nmethod() is used directly to keep the | |
| 700 // generated code from being reused too early. | |
| 693 class nmethodLocker : public StackObj { | 701 class nmethodLocker : public StackObj { |
| 694 nmethod* _nm; | 702 nmethod* _nm; |
| 695 | 703 |
| 696 public: | 704 public: |
| 697 | 705 |
| 698 static void lock_nmethod(nmethod* nm); // note: nm can be NULL | 706 // note: nm can be NULL |
| 707 // Only JvmtiDeferredEvent::compiled_method_unload_event() | |
| 708 // should pass zombie_ok == true. | |
| 709 static void lock_nmethod(nmethod* nm, bool zombie_ok = false); | |
| 699 static void unlock_nmethod(nmethod* nm); // (ditto) | 710 static void unlock_nmethod(nmethod* nm); // (ditto) |
| 700 | 711 |
| 701 nmethodLocker(address pc); // derive nm from pc | 712 nmethodLocker(address pc); // derive nm from pc |
| 702 nmethodLocker(nmethod *nm) { _nm = nm; lock_nmethod(_nm); } | 713 nmethodLocker(nmethod *nm) { _nm = nm; lock_nmethod(_nm); } |
| 703 nmethodLocker() { _nm = NULL; } | 714 nmethodLocker() { _nm = NULL; } |
