1 /*
 2  * Copyright (c) 2017, 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 "classfile/classLoaderData.hpp"
27 #include "gc/g1/g1FullGCMarker.inline.hpp"
28 #include "gc/shared/referenceProcessor.hpp"
29 #include "memory/iterator.inline.hpp"
30 
31 G1FullGCMarker::G1FullGCMarker(uint worker_id, PreservedMarks* preserved_stack, G1CMBitMap* bitmap) :
32     _worker_id(worker_id),
33     _bitmap(bitmap),
34     _oop_stack(),
35     _objarray_stack(),
36     _preserved_stack(preserved_stack),
37     _mark_closure(worker_id, this, G1CollectedHeap::heap()->ref_processor_stw()),
38     _verify_closure(VerifyOption_G1UseFullMarking),
39     _stack_closure(this),
40     _cld_closure(mark_closure(), ClassLoaderData::_claim_value_strong) {
41   _oop_stack.initialize();
42   _objarray_stack.initialize();
43 }
44 
45 G1FullGCMarker::~G1FullGCMarker() {
46   assert(is_empty(), "Must be empty at this point");
47 }
48 
49 void G1FullGCMarker::complete_marking(OopQueueSet* oop_stacks,
50                                       ObjArrayTaskQueueSet* array_stacks,
51                                       ParallelTaskTerminator* terminator) {
52   do {
53     drain_stack();
54     ObjArrayTask steal_array;
55     if (array_stacks->steal(_worker_id, steal_array)) {
56       follow_array_chunk(objArrayOop(steal_array.obj()), steal_array.index());
57     } else {
58       oop steal_oop;
59       if (oop_stacks->steal(_worker_id, steal_oop)) {
60         follow_object(steal_oop);
61       }
62     }
63   } while (!is_empty() || !terminator->offer_termination());
64 }