22 *
23 */
24
25 #ifndef SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSSCAVENGE_INLINE_HPP
26 #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSSCAVENGE_INLINE_HPP
27
28 #include "gc_implementation/parallelScavenge/cardTableExtension.hpp"
29 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
30 #include "gc_implementation/parallelScavenge/psPromotionManager.hpp"
31 #include "gc_implementation/parallelScavenge/psPromotionManager.inline.hpp"
32 #include "gc_implementation/parallelScavenge/psScavenge.hpp"
33 #include "memory/iterator.hpp"
34
35 inline void PSScavenge::save_to_space_top_before_gc() {
36 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap();
37 _to_space_top_before_gc = heap->young_gen()->to_space()->top();
38 }
39
40 template <class T> inline bool PSScavenge::should_scavenge(T* p) {
41 T heap_oop = oopDesc::load_heap_oop(p);
42 if (oopDesc::is_null(heap_oop)) return false;
43 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
44 return PSScavenge::is_obj_in_young((HeapWord*)obj);
45 }
46
47 template <class T>
48 inline bool PSScavenge::should_scavenge(T* p, MutableSpace* to_space) {
49 if (should_scavenge(p)) {
50 oop obj = oopDesc::load_decode_heap_oop_not_null(p);
51 // Skip objects copied to to_space since the scavenge started.
52 HeapWord* const addr = (HeapWord*)obj;
53 return addr < to_space_top_before_gc() || addr >= to_space->end();
54 }
55 return false;
56 }
57
58 template <class T>
59 inline bool PSScavenge::should_scavenge(T* p, bool check_to_space) {
60 if (check_to_space) {
61 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap();
62 return should_scavenge(p, heap->young_gen()->to_space());
63 }
64 return should_scavenge(p);
77 ? o->forwardee()
78 : pm->copy_to_survivor_space<promote_immediately>(o);
79
80 #ifndef PRODUCT
81 // This code must come after the CAS test, or it will print incorrect
82 // information.
83 if (TraceScavenge && o->is_forwarded()) {
84 gclog_or_tty->print_cr("{%s %s " PTR_FORMAT " -> " PTR_FORMAT " (%d)}",
85 "forwarding",
86 new_obj->klass()->internal_name(), o, new_obj, new_obj->size());
87 }
88 #endif
89
90 oopDesc::encode_store_heap_oop_not_null(p, new_obj);
91
92 // We cannot mark without test, as some code passes us pointers
93 // that are outside the heap. These pointers are either from roots
94 // or from metadata.
95 if ((!PSScavenge::is_obj_in_young((HeapWord*)p)) &&
96 Universe::heap()->is_in_reserved(p)) {
97 if (PSScavenge::is_obj_in_young((HeapWord*)new_obj)) {
98 card_table()->inline_write_ref_field_gc(p, new_obj);
99 }
100 }
101 }
102
103 template<bool promote_immediately>
104 class PSRootsClosure: public OopClosure {
105 private:
106 PSPromotionManager* _promotion_manager;
107
108 protected:
109 template <class T> void do_oop_work(T *p) {
110 if (PSScavenge::should_scavenge(p)) {
111 // We never card mark roots, maybe call a func without test?
112 PSScavenge::copy_and_push_safe_barrier<T, promote_immediately>(_promotion_manager, p);
113 }
114 }
115 public:
116 PSRootsClosure(PSPromotionManager* pm) : _promotion_manager(pm) { }
117 void do_oop(oop* p) { PSRootsClosure::do_oop_work(p); }
130 Klass* _scanned_klass;
131 public:
132 PSScavengeFromKlassClosure(PSPromotionManager* pm) : _pm(pm), _scanned_klass(NULL) { }
133 void do_oop(narrowOop* p) { ShouldNotReachHere(); }
134 void do_oop(oop* p) {
135 ParallelScavengeHeap* psh = ParallelScavengeHeap::heap();
136 assert(!psh->is_in_reserved(p), "GC barrier needed");
137 if (PSScavenge::should_scavenge(p)) {
138 assert(!Universe::heap()->is_in_reserved(p), "Not from meta-data?");
139 assert(PSScavenge::should_scavenge(p, true), "revisiting object?");
140
141 oop o = *p;
142 oop new_obj;
143 if (o->is_forwarded()) {
144 new_obj = o->forwardee();
145 } else {
146 new_obj = _pm->copy_to_survivor_space</*promote_immediately=*/false>(o);
147 }
148 oopDesc::encode_store_heap_oop_not_null(p, new_obj);
149
150 if (PSScavenge::is_obj_in_young((HeapWord*)new_obj)) {
151 do_klass_barrier();
152 }
153 }
154 }
155
156 void set_scanned_klass(Klass* klass) {
157 assert(_scanned_klass == NULL || klass == NULL, "Should always only handling one klass at a time");
158 _scanned_klass = klass;
159 }
160
161 private:
162 void do_klass_barrier() {
163 assert(_scanned_klass != NULL, "Should not be called without having a scanned klass");
164 _scanned_klass->record_modified_oops();
165 }
166
167 };
168
169 // Scavenges the oop in a Klass.
170 class PSScavengeKlassClosure: public KlassClosure {
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22 *
23 */
24
25 #ifndef SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSSCAVENGE_INLINE_HPP
26 #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSSCAVENGE_INLINE_HPP
27
28 #include "gc_implementation/parallelScavenge/cardTableExtension.hpp"
29 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
30 #include "gc_implementation/parallelScavenge/psPromotionManager.hpp"
31 #include "gc_implementation/parallelScavenge/psPromotionManager.inline.hpp"
32 #include "gc_implementation/parallelScavenge/psScavenge.hpp"
33 #include "memory/iterator.hpp"
34
35 inline void PSScavenge::save_to_space_top_before_gc() {
36 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap();
37 _to_space_top_before_gc = heap->young_gen()->to_space()->top();
38 }
39
40 template <class T> inline bool PSScavenge::should_scavenge(T* p) {
41 T heap_oop = oopDesc::load_heap_oop(p);
42 return PSScavenge::is_obj_in_young(heap_oop);
43 }
44
45 template <class T>
46 inline bool PSScavenge::should_scavenge(T* p, MutableSpace* to_space) {
47 if (should_scavenge(p)) {
48 oop obj = oopDesc::load_decode_heap_oop_not_null(p);
49 // Skip objects copied to to_space since the scavenge started.
50 HeapWord* const addr = (HeapWord*)obj;
51 return addr < to_space_top_before_gc() || addr >= to_space->end();
52 }
53 return false;
54 }
55
56 template <class T>
57 inline bool PSScavenge::should_scavenge(T* p, bool check_to_space) {
58 if (check_to_space) {
59 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap();
60 return should_scavenge(p, heap->young_gen()->to_space());
61 }
62 return should_scavenge(p);
75 ? o->forwardee()
76 : pm->copy_to_survivor_space<promote_immediately>(o);
77
78 #ifndef PRODUCT
79 // This code must come after the CAS test, or it will print incorrect
80 // information.
81 if (TraceScavenge && o->is_forwarded()) {
82 gclog_or_tty->print_cr("{%s %s " PTR_FORMAT " -> " PTR_FORMAT " (%d)}",
83 "forwarding",
84 new_obj->klass()->internal_name(), o, new_obj, new_obj->size());
85 }
86 #endif
87
88 oopDesc::encode_store_heap_oop_not_null(p, new_obj);
89
90 // We cannot mark without test, as some code passes us pointers
91 // that are outside the heap. These pointers are either from roots
92 // or from metadata.
93 if ((!PSScavenge::is_obj_in_young((HeapWord*)p)) &&
94 Universe::heap()->is_in_reserved(p)) {
95 if (PSScavenge::is_obj_in_young(new_obj)) {
96 card_table()->inline_write_ref_field_gc(p, new_obj);
97 }
98 }
99 }
100
101 template<bool promote_immediately>
102 class PSRootsClosure: public OopClosure {
103 private:
104 PSPromotionManager* _promotion_manager;
105
106 protected:
107 template <class T> void do_oop_work(T *p) {
108 if (PSScavenge::should_scavenge(p)) {
109 // We never card mark roots, maybe call a func without test?
110 PSScavenge::copy_and_push_safe_barrier<T, promote_immediately>(_promotion_manager, p);
111 }
112 }
113 public:
114 PSRootsClosure(PSPromotionManager* pm) : _promotion_manager(pm) { }
115 void do_oop(oop* p) { PSRootsClosure::do_oop_work(p); }
128 Klass* _scanned_klass;
129 public:
130 PSScavengeFromKlassClosure(PSPromotionManager* pm) : _pm(pm), _scanned_klass(NULL) { }
131 void do_oop(narrowOop* p) { ShouldNotReachHere(); }
132 void do_oop(oop* p) {
133 ParallelScavengeHeap* psh = ParallelScavengeHeap::heap();
134 assert(!psh->is_in_reserved(p), "GC barrier needed");
135 if (PSScavenge::should_scavenge(p)) {
136 assert(!Universe::heap()->is_in_reserved(p), "Not from meta-data?");
137 assert(PSScavenge::should_scavenge(p, true), "revisiting object?");
138
139 oop o = *p;
140 oop new_obj;
141 if (o->is_forwarded()) {
142 new_obj = o->forwardee();
143 } else {
144 new_obj = _pm->copy_to_survivor_space</*promote_immediately=*/false>(o);
145 }
146 oopDesc::encode_store_heap_oop_not_null(p, new_obj);
147
148 if (PSScavenge::is_obj_in_young(new_obj)) {
149 do_klass_barrier();
150 }
151 }
152 }
153
154 void set_scanned_klass(Klass* klass) {
155 assert(_scanned_klass == NULL || klass == NULL, "Should always only handling one klass at a time");
156 _scanned_klass = klass;
157 }
158
159 private:
160 void do_klass_barrier() {
161 assert(_scanned_klass != NULL, "Should not be called without having a scanned klass");
162 _scanned_klass->record_modified_oops();
163 }
164
165 };
166
167 // Scavenges the oop in a Klass.
168 class PSScavengeKlassClosure: public KlassClosure {
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