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.
22 *
23 */
24
25 #ifndef SHARE_VM_GC_G1_G1PARSCANTHREADSTATE_INLINE_HPP
26 #define SHARE_VM_GC_G1_G1PARSCANTHREADSTATE_INLINE_HPP
27
28 #include "gc/g1/g1ParScanThreadState.hpp"
29 #include "gc/g1/g1RemSet.hpp"
30 #include "oops/access.inline.hpp"
31 #include "oops/oop.inline.hpp"
32
33 template <class T> void G1ParScanThreadState::do_oop_evac(T* p) {
34 // Reference should not be NULL here as such are never pushed to the task queue.
35 oop obj = RawAccess<IS_NOT_NULL>::oop_load(p);
36
37 // Although we never intentionally push references outside of the collection
38 // set, due to (benign) races in the claim mechanism during RSet scanning more
39 // than one thread might claim the same card. So the same card may be
40 // processed multiple times, and so we might get references into old gen here.
41 // So we need to redo this check.
42 const InCSetState in_cset_state = _g1h->in_cset_state(obj);
43 if (!in_cset_state.is_in_cset()) {
44 // In this case somebody else already did all the work.
45 return;
46 }
47
48 markOop m = obj->mark_raw();
49 if (m->is_marked()) {
50 obj = (oop) m->decode_pointer();
51 } else {
52 obj = copy_to_survivor_space(in_cset_state, obj, m);
53 }
54 RawAccess<IS_NOT_NULL>::oop_store(p, obj);
55
56 assert(obj != NULL, "Must be");
57 if (!HeapRegion::is_in_same_region(p, obj)) {
58 HeapRegion* from = _g1h->heap_region_containing(p);
59 update_rs(from, p, obj);
60 }
61 }
62
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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.
22 *
23 */
24
25 #ifndef SHARE_VM_GC_G1_G1PARSCANTHREADSTATE_INLINE_HPP
26 #define SHARE_VM_GC_G1_G1PARSCANTHREADSTATE_INLINE_HPP
27
28 #include "gc/g1/g1CollectedHeap.inline.hpp"
29 #include "gc/g1/g1ParScanThreadState.hpp"
30 #include "gc/g1/g1RemSet.hpp"
31 #include "oops/access.inline.hpp"
32 #include "oops/oop.inline.hpp"
33
34 template <class T> void G1ParScanThreadState::do_oop_evac(T* p) {
35 // Reference should not be NULL here as such are never pushed to the task queue.
36 oop obj = RawAccess<IS_NOT_NULL>::oop_load(p);
37
38 // Although we never intentionally push references outside of the collection
39 // set, due to (benign) races in the claim mechanism during RSet scanning more
40 // than one thread might claim the same card. So the same card may be
41 // processed multiple times, and so we might get references into old gen here.
42 // So we need to redo this check.
43 const InCSetState in_cset_state = _g1h->in_cset_state(obj);
44 // References pushed onto the work stack should never point to a humongous region
45 // as they are not added to the collection set due to above precondition.
46 assert(!in_cset_state.is_humongous(),
47 "Obj " PTR_FORMAT " should not refer to humongous region %u from " PTR_FORMAT,
48 p2i(obj), _g1h->addr_to_region((HeapWord*)obj), p2i(p));
49
50 if (!in_cset_state.is_in_cset()) {
51 // In this case somebody else already did all the work.
52 return;
53 }
54
55 markOop m = obj->mark_raw();
56 if (m->is_marked()) {
57 obj = (oop) m->decode_pointer();
58 } else {
59 obj = copy_to_survivor_space(in_cset_state, obj, m);
60 }
61 RawAccess<IS_NOT_NULL>::oop_store(p, obj);
62
63 assert(obj != NULL, "Must be");
64 if (!HeapRegion::is_in_same_region(p, obj)) {
65 HeapRegion* from = _g1h->heap_region_containing(p);
66 update_rs(from, p, obj);
67 }
68 }
69
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