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 
32 G1ParCopyHelper::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 
40 G1ScanClosureBase::G1ScanClosureBase(G1CollectedHeap* g1h, G1ParScanThreadState* par_scan_state) :
41   _g1h(g1h), _par_scan_state(par_scan_state), _from(NULL)
42 { }
43 
44 void 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, _must_claim, /*clear_modified_oops*/true);
56 
57     _closure->set_scanned_cld(NULL);
58 
59     _closure->trim_queue_partially();
60   }
61   _count++;
62 }