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24
25#ifndef SHARE_GC_SERIAL_DEFNEWGENERATION_INLINE_HPP
26#define SHARE_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.inline.hpp"
33#include "oops/access.inline.hpp"
34
35// Methods of protected closure types
36
37template <class T>
38inline void DefNewGeneration::KeepAliveClosure::do_oop_work(T* p) {
39#ifdef ASSERT
40 {
41 // We never expect to see a null reference being processed
42 // as a weak reference.
43 oop obj = RawAccess<IS_NOT_NULL>::oop_load(p);
44 assert (oopDesc::is_oop(obj), "expected an oop while scanning weak refs");
45 }
46#endif // ASSERT
47
48 Devirtualizer::do_oop_no_verify(_cl, 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 = RawAccess<IS_NOT_NULL>::oop_load(p);
65 _rs->inline_write_ref_field_gc(p, obj);
66 }
67}
68
69template <class T>
70inline 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 oop obj = RawAccess<IS_NOT_NULL>::oop_load(p);
76 assert (oopDesc::is_oop(obj), "expected an oop while scanning weak refs");
77 }
78#endif // ASSERT
79
80 Devirtualizer::do_oop_no_verify(_cl, p);
81
82 // Optimized for Defnew generation if it's the youngest generation:
83 // we set a younger_gen card if we have an older->youngest
84 // generation pointer.
85 oop obj = RawAccess<IS_NOT_NULL>::oop_load(p);
86 if (((HeapWord*)obj < _boundary) && GenCollectedHeap::heap()->is_in_reserved(p)) {
87 _rs->inline_write_ref_field_gc(p, obj);
88 }
89}
90
91template <typename OopClosureType>
92void DefNewGeneration::oop_since_save_marks_iterate(OopClosureType* cl) {
93 cl->set_generation(this);
94 eden()->oop_since_save_marks_iterate(cl);
95 to()->oop_since_save_marks_iterate(cl);
96 from()->oop_since_save_marks_iterate(cl);
97 cl->reset_generation();
98 save_marks();
99}
100
101#endif // SHARE_GC_SERIAL_DEFNEWGENERATION_INLINE_HPP
102