1/*
2 * Copyright (c) 2017, 2019, 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#ifndef SHARE_JFR_LEAKPROFILER_UTILITIES_SAVERESTORE_HPP
26#define SHARE_JFR_LEAKPROFILER_UTILITIES_SAVERESTORE_HPP
27
28#include "memory/allocation.hpp"
29#include "memory/iterator.hpp"
30#include "oops/markOop.hpp"
31#include "utilities/growableArray.hpp"
32
33template <typename T, typename Impl>
34class SaveRestore {
35 private:
36 Impl _impl;
37 public:
38 SaveRestore() : _impl() {
39 _impl.setup();
40 }
41
42 void save(T const& value) {
43 _impl.save(value);
44 }
45
46 ~SaveRestore() {
47 _impl.restore();
48 }
49};
50
51template <typename T, typename Context>
52class ContextStore {
53private:
54 GrowableArray<Context>* _storage;
55public:
56 ContextStore() : _storage(NULL) {}
57
58 void setup() {
59 assert(_storage == NULL, "invariant");
60 _storage = new GrowableArray<Context>(16);
61 }
62
63 void save(T const& value) {
64 _storage->push(Context(value));
65 }
66
67 void restore() {
68 for (int i = 0; i < _storage->length(); ++i) {
69 _storage->at(i).~Context();
70 }
71 }
72};
73
74/*
75* This class will save the original mark oop of an object sample object.
76* It will then install an "identifier" mark oop to be used for
77* identification purposes in the search for reference chains.
78* The destructor will restore the original mark oop.
79*/
80
81class MarkOopContext {
82 private:
83 oop _obj;
84 markOop _mark_oop;
85 void swap(MarkOopContext& rhs);
86 public:
87 MarkOopContext();
88 MarkOopContext(const oop obj);
89 MarkOopContext(const MarkOopContext& rhs);
90 void operator=(MarkOopContext rhs);
91 ~MarkOopContext();
92};
93
94typedef SaveRestore<oop, ContextStore<oop, MarkOopContext> > SaveRestoreMarkOops;
95
96class ClassLoaderData;
97
98class CLDClaimContext {
99 private:
100 ClassLoaderData* _cld;
101 void swap(CLDClaimContext& rhs);
102 public:
103 CLDClaimContext();
104 CLDClaimContext(ClassLoaderData* cld);
105 CLDClaimContext(const CLDClaimContext& rhs);
106 void operator=(CLDClaimContext rhs);
107 ~CLDClaimContext();
108};
109
110typedef SaveRestore<ClassLoaderData*, ContextStore<ClassLoaderData*, CLDClaimContext> > SaveRestoreCLDClaimState;
111
112class CLDClaimStateClosure : public CLDClosure {
113 private:
114 SaveRestoreCLDClaimState _state;
115 public:
116 CLDClaimStateClosure();
117 void do_cld(ClassLoaderData* cld);
118};
119
120class SaveRestoreCLDClaimBits : public StackObj {
121 private:
122 CLDClaimStateClosure _claim_state_closure;
123 public:
124 SaveRestoreCLDClaimBits();
125 ~SaveRestoreCLDClaimBits();
126};
127
128#endif // SHARE_JFR_LEAKPROFILER_UTILITIES_SAVERESTORE_HPP
129