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#include "precompiled.hpp"
25#include "classfile/javaClasses.inline.hpp"
26#include "jfr/leakprofiler/chains/edge.hpp"
27#include "jfr/leakprofiler/utilities/unifiedOop.hpp"
28
29Edge::Edge() : _parent(NULL), _reference(NULL) {}
30
31Edge::Edge(const Edge* parent, const oop* reference) : _parent(parent),
32 _reference(reference) {}
33
34const oop Edge::pointee() const {
35 return UnifiedOop::dereference(_reference);
36}
37
38const oop Edge::reference_owner() const {
39 return is_root() ? (oop)NULL : UnifiedOop::dereference(_parent->reference());
40}
41
42static const Klass* resolve_klass(const oop obj) {
43 assert(obj != NULL, "invariant");
44 return java_lang_Class::is_instance(obj) ?
45 java_lang_Class::as_Klass(obj) : obj->klass();
46}
47
48const Klass* Edge::pointee_klass() const {
49 return resolve_klass(pointee());
50}
51
52const Klass* Edge::reference_owner_klass() const {
53 const oop ref_owner = reference_owner();
54 return ref_owner != NULL ? resolve_klass(ref_owner) : NULL;
55}
56
57size_t Edge::distance_to_root() const {
58 size_t depth = 0;
59 const Edge* current = _parent;
60 while (current != NULL) {
61 depth++;
62 current = current->parent();
63 }
64 return depth;
65}
66