1/*
2 * Copyright (c) 2017, 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 "classfile/classLoaderDataGraph.hpp"
27#include "jfr/leakprofiler/utilities/saveRestore.hpp"
28#include "oops/oop.inline.hpp"
29
30MarkOopContext::MarkOopContext() : _obj(NULL), _mark_oop(NULL) {}
31
32MarkOopContext::MarkOopContext(const oop obj) : _obj(obj), _mark_oop(obj->mark()) {
33 assert(_obj->mark() == _mark_oop, "invariant");
34 // now we will "poison" the mark word of the object
35 // to the intermediate monitor INFLATING state.
36 // This is an "impossible" state during a safepoint,
37 // hence we will use it to quickly identify objects
38 // during the reachability search from gc roots.
39 assert(NULL == markOopDesc::INFLATING(), "invariant");
40 _obj->set_mark(markOopDesc::INFLATING());
41 assert(NULL == obj->mark(), "invariant");
42}
43
44MarkOopContext::~MarkOopContext() {
45 if (_obj != NULL) {
46 _obj->set_mark(_mark_oop);
47 assert(_obj->mark() == _mark_oop, "invariant");
48 }
49}
50
51MarkOopContext::MarkOopContext(const MarkOopContext& rhs) : _obj(NULL), _mark_oop(NULL) {
52 swap(const_cast<MarkOopContext&>(rhs));
53}
54
55void MarkOopContext::operator=(MarkOopContext rhs) {
56 swap(rhs);
57}
58
59void MarkOopContext::swap(MarkOopContext& rhs) {
60 oop temp_obj = rhs._obj;
61 markOop temp_mark_oop = rhs._mark_oop;
62 rhs._obj = _obj;
63 rhs._mark_oop = _mark_oop;
64 _obj = temp_obj;
65 _mark_oop = temp_mark_oop;
66}
67
68CLDClaimContext::CLDClaimContext() : _cld(NULL) {}
69
70CLDClaimContext::CLDClaimContext(ClassLoaderData* cld) : _cld(cld) {
71 assert(_cld->claimed(), "invariant");
72 _cld->clear_claim();
73}
74
75CLDClaimContext::~CLDClaimContext() {
76 if (_cld != NULL) {
77 _cld->try_claim(ClassLoaderData::_claim_strong);
78 assert(_cld->claimed(), "invariant");
79 }
80}
81
82CLDClaimContext::CLDClaimContext(const CLDClaimContext& rhs) : _cld(NULL) {
83 swap(const_cast<CLDClaimContext&>(rhs));
84}
85
86void CLDClaimContext::operator=(CLDClaimContext rhs) {
87 swap(rhs);
88}
89
90void CLDClaimContext::swap(CLDClaimContext& rhs) {
91 ClassLoaderData* temp_cld = rhs._cld;
92 rhs._cld = _cld;
93 _cld = temp_cld;
94}
95
96CLDClaimStateClosure::CLDClaimStateClosure() : CLDClosure(), _state() {}
97
98void CLDClaimStateClosure::do_cld(ClassLoaderData* cld) {
99 assert(cld != NULL, "invariant");
100 if (cld->claimed()) {
101 _state.save(cld);
102 }
103}
104
105SaveRestoreCLDClaimBits::SaveRestoreCLDClaimBits() : _claim_state_closure() {
106 // interferes with GC, so walk all oops that GC would.
107 ClassLoaderDataGraph::cld_do(&_claim_state_closure);
108}
109
110SaveRestoreCLDClaimBits::~SaveRestoreCLDClaimBits() {
111 ClassLoaderDataGraph::clear_claimed_marks();
112}
113