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
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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
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