1/*
2 * Copyright (c) 2014, 2018, 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.
22 *
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 "memory/iterator.inline.hpp"
30#include "utilities/stack.inline.hpp"
31
32G1ParCopyHelper::G1ParCopyHelper(G1CollectedHeap* g1h, G1ParScanThreadState* par_scan_state) :
33 _g1h(g1h),
34 _par_scan_state(par_scan_state),
35 _worker_id(par_scan_state->worker_id()),
36 _scanned_cld(NULL),
37 _cm(_g1h->concurrent_mark())
38{ }
39
40G1ScanClosureBase::G1ScanClosureBase(G1CollectedHeap* g1h, G1ParScanThreadState* par_scan_state) :
41 _g1h(g1h), _par_scan_state(par_scan_state)
42{ }
43
44void G1CLDScanClosure::do_cld(ClassLoaderData* cld) {
45 // If the class loader data 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 || cld->has_modified_oops()) {
48
49 // Tell the closure that this class loader data is the CLD to scavenge
50 // and is the one to dirty if oops are left pointing into the young gen.
51 _closure->set_scanned_cld(cld);
52
53 // Clean the cld since we're going to scavenge all the metadata.
54 // Clear modified oops only if this cld is claimed.
55 cld->oops_do(_closure, _claim, /*clear_modified_oops*/true);
56
57 _closure->set_scanned_cld(NULL);
58
59 _closure->trim_queue_partially();
60 }
61 _count++;
62}
63