g1OopClosures.cpp revision 9175:01b171218ecd 
1/*
2 * Copyright (c) 2014, 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
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23 */
24
25#include "precompiled.hpp"
26#include "gc/g1/g1CollectedHeap.inline.hpp"
27#include "gc/g1/g1OopClosures.inline.hpp"
28#include "gc/g1/g1ParScanThreadState.hpp"
29#include "gc/g1/g1_specialized_oop_closures.hpp"
30#include "memory/iterator.inline.hpp"
31#include "utilities/stack.inline.hpp"
32
33G1ParCopyHelper::G1ParCopyHelper(G1CollectedHeap* g1,  G1ParScanThreadState* par_scan_state) :
34  G1ParClosureSuper(g1, par_scan_state),
35  _worker_id(par_scan_state->worker_id()),
36  _scanned_klass(NULL),
37  _cm(_g1->concurrent_mark())
38{ }
39
40G1ParClosureSuper::G1ParClosureSuper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) :
41  _g1(g1), _par_scan_state(par_scan_state)
42{ }
43
44void G1KlassScanClosure::do_klass(Klass* klass) {
45  // If the klass has not been dirtied we know that there's
46  // no references into  the young gen and we can skip it.
47  if (!_process_only_dirty || klass->has_modified_oops()) {
48    // Clean the klass since we're going to scavenge all the metadata.
49    klass->clear_modified_oops();
50
51    // Tell the closure that this klass is the Klass to scavenge
52    // and is the one to dirty if oops are left pointing into the young gen.
53    _closure->set_scanned_klass(klass);
54
55    klass->oops_do(_closure);
56
57    _closure->set_scanned_klass(NULL);
58  }
59  _count++;
60}
61
62// Generate G1 specialized oop_oop_iterate functions.
63SPECIALIZED_OOP_OOP_ITERATE_CLOSURES_G1(ALL_KLASS_OOP_OOP_ITERATE_DEFN)
64