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/*
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* Copyright (c) 2014, 2018, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#include "precompiled.hpp"
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#include "classfile/javaClasses.inline.hpp"
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#include "jfr/leakprofiler/chains/edge.hpp"
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#include "jfr/leakprofiler/utilities/unifiedOop.hpp"
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Edge::Edge() : _parent(NULL), _reference(NULL) {}
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Edge::Edge(const Edge* parent, const oop* reference) : _parent(parent),
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_reference(reference) {}
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const oop Edge::pointee() const {
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return UnifiedOop::dereference(_reference);
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}
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const oop Edge::reference_owner() const {
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return is_root() ? (oop)NULL : UnifiedOop::dereference(_parent->reference());
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}
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static const Klass* resolve_klass(const oop obj) {
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assert(obj != NULL, "invariant");
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return java_lang_Class::is_instance(obj) ?
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java_lang_Class::as_Klass(obj) : obj->klass();
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}
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const Klass* Edge::pointee_klass() const {
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return resolve_klass(pointee());
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}
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const Klass* Edge::reference_owner_klass() const {
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const oop ref_owner = reference_owner();
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return ref_owner != NULL ? resolve_klass(ref_owner) : NULL;
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}
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size_t Edge::distance_to_root() const {
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size_t depth = 0;
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const Edge* current = _parent;
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while (current != NULL) {
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depth++;
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current = current->parent();
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}
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return depth;
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}
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