1 /*
2 * Copyright (c) 2002, 2012, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
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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
34 inline void PSScavenge::save_to_space_top_before_gc() {
35 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap();
36 _to_space_top_before_gc = heap->young_gen()->to_space()->top();
37 }
38
39 template <class T> inline bool PSScavenge::should_scavenge(T* p) {
40 T heap_oop = oopDesc::load_heap_oop(p);
41 if (oopDesc::is_null(heap_oop)) return false;
42 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
43 return PSScavenge::is_obj_in_young((HeapWord*)obj);
44 }
45
46 template <class T>
47 inline bool PSScavenge::should_scavenge(T* p, MutableSpace* to_space) {
48 if (should_scavenge(p)) {
49 oop obj = oopDesc::load_decode_heap_oop_not_null(p);
50 // Skip objects copied to to_space since the scavenge started.
51 HeapWord* const addr = (HeapWord*)obj;
52 return addr < to_space_top_before_gc() || addr >= to_space->end();
53 }
54 return false;
55 }
56
57 template <class T>
58 inline bool PSScavenge::should_scavenge(T* p, bool check_to_space) {
59 if (check_to_space) {
60 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap();
61 return should_scavenge(p, heap->young_gen()->to_space());
62 }
63 return should_scavenge(p);
64 }
65
66 // Attempt to "claim" oop at p via CAS, push the new obj if successful
67 // This version tests the oop* to make sure it is within the heap before
68 // attempting marking.
69 template <class T, bool promote_immediately>
70 inline void PSScavenge::copy_and_push_safe_barrier(PSPromotionManager* pm,
71 T* p) {
72 assert(should_scavenge(p, true), "revisiting object?");
73
74 oop o = oopDesc::load_decode_heap_oop_not_null(p);
75 oop new_obj = o->is_forwarded()
76 ? o->forwardee()
77 : pm->copy_to_survivor_space<promote_immediately>(o);
78 oopDesc::encode_store_heap_oop_not_null(p, new_obj);
79
80 // We cannot mark without test, as some code passes us pointers
81 // that are outside the heap.
82 if ((!PSScavenge::is_obj_in_young((HeapWord*)p)) &&
83 Universe::heap()->is_in_reserved(p)) {
84 if (PSScavenge::is_obj_in_young((HeapWord*)new_obj)) {
85 card_table()->inline_write_ref_field_gc(p, new_obj);
86 }
87 }
88 }
89
90 template<bool promote_immediately>
91 class PSScavengeRootsClosure: public OopClosure {
92 private:
93 PSPromotionManager* _promotion_manager;
94
95 protected:
96 template <class T> void do_oop_work(T *p) {
97 if (PSScavenge::should_scavenge(p)) {
98 // We never card mark roots, maybe call a func without test?
99 PSScavenge::copy_and_push_safe_barrier<T, promote_immediately>(_promotion_manager, p);
100 }
101 }
102 public:
103 PSScavengeRootsClosure(PSPromotionManager* pm) : _promotion_manager(pm) { }
104 void do_oop(oop* p) { PSScavengeRootsClosure::do_oop_work(p); }
105 void do_oop(narrowOop* p) { PSScavengeRootsClosure::do_oop_work(p); }
106 };
107
108
109 #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSSCAVENGE_INLINE_HPP