24 25 #ifndef SHARE_VM_GC_SERIAL_DEFNEWGENERATION_INLINE_HPP 26 #define SHARE_VM_GC_SERIAL_DEFNEWGENERATION_INLINE_HPP 27 28 #include "gc/serial/defNewGeneration.hpp" 29 #include "gc/shared/cardTableRS.hpp" 30 #include "gc/shared/genCollectedHeap.hpp" 31 #include "gc/shared/genOopClosures.inline.hpp" 32 #include "gc/shared/space.hpp" 33 34 // Methods of protected closure types 35 36 template <class T> 37 inline void DefNewGeneration::KeepAliveClosure::do_oop_work(T* p) { 38 #ifdef ASSERT 39 { 40 // We never expect to see a null reference being processed 41 // as a weak reference. 42 assert (!oopDesc::is_null(*p), "expected non-null ref"); 43 oop obj = oopDesc::load_decode_heap_oop_not_null(p); 44 assert (obj->is_oop(), "expected an oop while scanning weak refs"); 45 } 46 #endif // ASSERT 47 48 _cl->do_oop_nv(p); 49 50 // Card marking is trickier for weak refs. 51 // This oop is a 'next' field which was filled in while we 52 // were discovering weak references. While we might not need 53 // to take a special action to keep this reference alive, we 54 // will need to dirty a card as the field was modified. 55 // 56 // Alternatively, we could create a method which iterates through 57 // each generation, allowing them in turn to examine the modified 58 // field. 59 // 60 // We could check that p is also in the old generation, but 61 // dirty cards in the young gen are never scanned, so the 62 // extra check probably isn't worthwhile. 63 if (GenCollectedHeap::heap()->is_in_reserved(p)) { 64 oop obj = oopDesc::load_decode_heap_oop_not_null(p); 65 _rs->inline_write_ref_field_gc(p, obj); 66 } 67 } 68 69 template <class T> 70 inline void DefNewGeneration::FastKeepAliveClosure::do_oop_work(T* p) { 71 #ifdef ASSERT 72 { 73 // We never expect to see a null reference being processed 74 // as a weak reference. 75 assert (!oopDesc::is_null(*p), "expected non-null ref"); 76 oop obj = oopDesc::load_decode_heap_oop_not_null(p); 77 assert (obj->is_oop(), "expected an oop while scanning weak refs"); 78 } 79 #endif // ASSERT 80 81 _cl->do_oop_nv(p); 82 83 // Optimized for Defnew generation if it's the youngest generation: 84 // we set a younger_gen card if we have an older->youngest 85 // generation pointer. 86 oop obj = oopDesc::load_decode_heap_oop_not_null(p); 87 if (((HeapWord*)obj < _boundary) && GenCollectedHeap::heap()->is_in_reserved(p)) { 88 _rs->inline_write_ref_field_gc(p, obj); 89 } 90 } 91 92 #endif // SHARE_VM_GC_SERIAL_DEFNEWGENERATION_INLINE_HPP | 24 25 #ifndef SHARE_VM_GC_SERIAL_DEFNEWGENERATION_INLINE_HPP 26 #define SHARE_VM_GC_SERIAL_DEFNEWGENERATION_INLINE_HPP 27 28 #include "gc/serial/defNewGeneration.hpp" 29 #include "gc/shared/cardTableRS.hpp" 30 #include "gc/shared/genCollectedHeap.hpp" 31 #include "gc/shared/genOopClosures.inline.hpp" 32 #include "gc/shared/space.hpp" 33 34 // Methods of protected closure types 35 36 template <class T> 37 inline void DefNewGeneration::KeepAliveClosure::do_oop_work(T* p) { 38 #ifdef ASSERT 39 { 40 // We never expect to see a null reference being processed 41 // as a weak reference. 42 assert (!oopDesc::is_null(*p), "expected non-null ref"); 43 oop obj = oopDesc::load_decode_heap_oop_not_null(p); 44 assert (oopDesc::is_oop(obj), "expected an oop while scanning weak refs"); 45 } 46 #endif // ASSERT 47 48 _cl->do_oop_nv(p); 49 50 // Card marking is trickier for weak refs. 51 // This oop is a 'next' field which was filled in while we 52 // were discovering weak references. While we might not need 53 // to take a special action to keep this reference alive, we 54 // will need to dirty a card as the field was modified. 55 // 56 // Alternatively, we could create a method which iterates through 57 // each generation, allowing them in turn to examine the modified 58 // field. 59 // 60 // We could check that p is also in the old generation, but 61 // dirty cards in the young gen are never scanned, so the 62 // extra check probably isn't worthwhile. 63 if (GenCollectedHeap::heap()->is_in_reserved(p)) { 64 oop obj = oopDesc::load_decode_heap_oop_not_null(p); 65 _rs->inline_write_ref_field_gc(p, obj); 66 } 67 } 68 69 template <class T> 70 inline void DefNewGeneration::FastKeepAliveClosure::do_oop_work(T* p) { 71 #ifdef ASSERT 72 { 73 // We never expect to see a null reference being processed 74 // as a weak reference. 75 assert (!oopDesc::is_null(*p), "expected non-null ref"); 76 oop obj = oopDesc::load_decode_heap_oop_not_null(p); 77 assert (oopDesc::is_oop(obj), "expected an oop while scanning weak refs"); 78 } 79 #endif // ASSERT 80 81 _cl->do_oop_nv(p); 82 83 // Optimized for Defnew generation if it's the youngest generation: 84 // we set a younger_gen card if we have an older->youngest 85 // generation pointer. 86 oop obj = oopDesc::load_decode_heap_oop_not_null(p); 87 if (((HeapWord*)obj < _boundary) && GenCollectedHeap::heap()->is_in_reserved(p)) { 88 _rs->inline_write_ref_field_gc(p, obj); 89 } 90 } 91 92 #endif // SHARE_VM_GC_SERIAL_DEFNEWGENERATION_INLINE_HPP |