1 /*
2 * Copyright (c) 2007, 2015, 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.
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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
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23 */
24
25 #ifndef SHARE_VM_GC_CMS_PAROOPCLOSURES_INLINE_HPP
26 #define SHARE_VM_GC_CMS_PAROOPCLOSURES_INLINE_HPP
27
28 #include "gc/cms/parNewGeneration.hpp"
29 #include "gc/cms/parOopClosures.hpp"
30 #include "gc/shared/cardTableRS.hpp"
31 #include "gc/shared/genCollectedHeap.hpp"
32 #include "gc/shared/genOopClosures.inline.hpp"
33 #include "logging/log.hpp"
34
35 template <class T> inline void ParScanWeakRefClosure::do_oop_work(T* p) {
36 assert (!oopDesc::is_null(*p), "null weak reference?");
37 oop obj = oopDesc::load_decode_heap_oop_not_null(p);
38 // weak references are sometimes scanned twice; must check
39 // that to-space doesn't already contain this object
40 if ((HeapWord*)obj < _boundary && !_g->to()->is_in_reserved(obj)) {
41 // we need to ensure that it is copied (see comment in
42 // ParScanClosure::do_oop_work).
43 Klass* objK = obj->klass();
44 markOop m = obj->mark();
45 oop new_obj;
46 if (m->is_marked()) { // Contains forwarding pointer.
47 new_obj = ParNewGeneration::real_forwardee(obj);
48 } else {
49 size_t obj_sz = obj->size_given_klass(objK);
50 new_obj = ((ParNewGeneration*)_g)->copy_to_survivor_space(_par_scan_state,
51 obj, obj_sz, m);
52 }
53 oopDesc::encode_store_heap_oop_not_null(p, new_obj);
54 }
55 }
56
57 inline void ParScanWeakRefClosure::do_oop_nv(oop* p) { ParScanWeakRefClosure::do_oop_work(p); }
58 inline void ParScanWeakRefClosure::do_oop_nv(narrowOop* p) { ParScanWeakRefClosure::do_oop_work(p); }
59
60 template <class T> inline void ParScanClosure::par_do_barrier(T* p) {
61 assert(generation()->is_in_reserved(p), "expected ref in generation");
62 assert(!oopDesc::is_null(*p), "expected non-null object");
63 oop obj = oopDesc::load_decode_heap_oop_not_null(p);
64 // If p points to a younger generation, mark the card.
65 if ((HeapWord*)obj < gen_boundary()) {
66 rs()->write_ref_field_gc_par(p, obj);
67 }
68 }
69
70 template <class T>
71 inline void ParScanClosure::do_oop_work(T* p,
72 bool gc_barrier,
73 bool root_scan) {
74 assert((!GenCollectedHeap::heap()->is_in_reserved(p) ||
75 generation()->is_in_reserved(p))
76 && (GenCollectedHeap::heap()->is_young_gen(generation()) || gc_barrier),
77 "The gen must be right, and we must be doing the barrier "
78 "in older generations.");
79 T heap_oop = oopDesc::load_heap_oop(p);
80 if (!oopDesc::is_null(heap_oop)) {
81 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
82 if ((HeapWord*)obj < _boundary) {
83 #ifndef PRODUCT
84 if (_g->to()->is_in_reserved(obj)) {
85 Log(gc) log;
86 log.error("Scanning field (" PTR_FORMAT ") twice?", p2i(p));
87 GenCollectedHeap* gch = GenCollectedHeap::heap();
88 Space* sp = gch->space_containing(p);
89 oop obj = oop(sp->block_start(p));
90 assert((HeapWord*)obj < (HeapWord*)p, "Error");
91 log.error("Object: " PTR_FORMAT, p2i((void *)obj));
92 log.error("-------");
93 obj->print_on(log.error_stream());
94 log.error("-----");
95 log.error("Heap:");
96 log.error("-----");
97 gch->print_on(log.error_stream());
98 ShouldNotReachHere();
99 }
100 #endif
101 // OK, we need to ensure that it is copied.
102 // We read the klass and mark in this order, so that we can reliably
103 // get the size of the object: if the mark we read is not a
104 // forwarding pointer, then the klass is valid: the klass is only
105 // overwritten with an overflow next pointer after the object is
106 // forwarded.
107 Klass* objK = obj->klass();
108 markOop m = obj->mark();
109 oop new_obj;
110 if (m->is_marked()) { // Contains forwarding pointer.
111 new_obj = ParNewGeneration::real_forwardee(obj);
112 oopDesc::encode_store_heap_oop_not_null(p, new_obj);
113 log_develop_trace(gc, scavenge)("{%s %s ( " PTR_FORMAT " ) " PTR_FORMAT " -> " PTR_FORMAT " (%d)}",
114 "forwarded ",
115 new_obj->klass()->internal_name(), p2i(p), p2i((void *)obj), p2i((void *)new_obj), new_obj->size());
116 } else {
117 size_t obj_sz = obj->size_given_klass(objK);
118 new_obj = _g->copy_to_survivor_space(_par_scan_state, obj, obj_sz, m);
119 oopDesc::encode_store_heap_oop_not_null(p, new_obj);
120 if (root_scan) {
121 // This may have pushed an object. If we have a root
122 // category with a lot of roots, can't let the queue get too
123 // full:
124 (void)_par_scan_state->trim_queues(10 * ParallelGCThreads);
125 }
126 }
127 if (is_scanning_a_klass()) {
128 do_klass_barrier();
129 } else if (gc_barrier) {
130 // Now call parent closure
131 par_do_barrier(p);
132 }
133 }
134 }
135 }
136
137 inline void ParScanWithBarrierClosure::do_oop_nv(oop* p) { ParScanClosure::do_oop_work(p, true, false); }
138 inline void ParScanWithBarrierClosure::do_oop_nv(narrowOop* p) { ParScanClosure::do_oop_work(p, true, false); }
139
140 inline void ParScanWithoutBarrierClosure::do_oop_nv(oop* p) { ParScanClosure::do_oop_work(p, false, false); }
141 inline void ParScanWithoutBarrierClosure::do_oop_nv(narrowOop* p) { ParScanClosure::do_oop_work(p, false, false); }
142
143 #endif // SHARE_VM_GC_CMS_PAROOPCLOSURES_INLINE_HPP