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/classLoaderData.hpp"
27 #include "jfr/leakprofiler/utilities/saveRestore.hpp"
28 #include "oops/oop.inline.hpp"
29
MarkOopContext()30 MarkOopContext::MarkOopContext() : _obj(NULL), _mark_oop(NULL) {}
31
MarkOopContext(const oop obj)32 MarkOopContext::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
~MarkOopContext()44 MarkOopContext::~MarkOopContext() {
45 if (_obj != NULL) {
46 _obj->set_mark(_mark_oop);
47 assert(_obj->mark() == _mark_oop, "invariant");
48 }
49 }
50
MarkOopContext(const MarkOopContext & rhs)51 MarkOopContext::MarkOopContext(const MarkOopContext& rhs) : _obj(NULL), _mark_oop(NULL) {
52 swap(const_cast<MarkOopContext&>(rhs));
53 }
54
operator =(MarkOopContext rhs)55 void MarkOopContext::operator=(MarkOopContext rhs) {
56 swap(rhs);
57 }
58
swap(MarkOopContext & rhs)59 void 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
CLDClaimContext()68 CLDClaimContext::CLDClaimContext() : _cld(NULL) {}
69
CLDClaimContext(ClassLoaderData * cld)70 CLDClaimContext::CLDClaimContext(ClassLoaderData* cld) : _cld(cld) {
71 assert(_cld->claimed(), "invariant");
72 _cld->clear_claimed();
73 }
74
~CLDClaimContext()75 CLDClaimContext::~CLDClaimContext() {
76 if (_cld != NULL) {
77 _cld->claim();
78 assert(_cld->claimed(), "invariant");
79 }
80 }
81
CLDClaimContext(const CLDClaimContext & rhs)82 CLDClaimContext::CLDClaimContext(const CLDClaimContext& rhs) : _cld(NULL) {
83 swap(const_cast<CLDClaimContext&>(rhs));
84 }
85
operator =(CLDClaimContext rhs)86 void CLDClaimContext::operator=(CLDClaimContext rhs) {
87 swap(rhs);
88 }
89
swap(CLDClaimContext & rhs)90 void CLDClaimContext::swap(CLDClaimContext& rhs) {
91 ClassLoaderData* temp_cld = rhs._cld;
92 rhs._cld = _cld;
93 _cld = temp_cld;
94 }
95
CLDClaimStateClosure()96 CLDClaimStateClosure::CLDClaimStateClosure() : CLDClosure(), _state() {}
97
do_cld(ClassLoaderData * cld)98 void CLDClaimStateClosure::do_cld(ClassLoaderData* cld) {
99 assert(cld != NULL, "invariant");
100 if (cld->claimed()) {
101 _state.save(cld);
102 }
103 }
104
SaveRestoreCLDClaimBits()105 SaveRestoreCLDClaimBits::SaveRestoreCLDClaimBits() : _claim_state_closure() {
106 ClassLoaderDataGraph::cld_do(&_claim_state_closure);
107 }
108
~SaveRestoreCLDClaimBits()109 SaveRestoreCLDClaimBits::~SaveRestoreCLDClaimBits() {
110 ClassLoaderDataGraph::clear_claimed_marks();
111 }
112