1 /* 2 * Copyright (c) 2014, 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 #include "precompiled.hpp" 25 #include "jfr/leakprofiler/chains/edge.hpp" 26 #include "jfr/leakprofiler/utilities/unifiedOop.hpp" 27 28 Edge::Edge() : _parent(NULL), _reference(NULL) {} 29 30 Edge::Edge(const Edge* parent, const oop* reference) : _parent(parent), 31 _reference(reference) {} 32 33 const oop Edge::pointee() const { 34 return UnifiedOop::dereference(_reference); 35 } 36 37 const oop Edge::reference_owner() const { 38 return is_root() ? (oop)NULL : UnifiedOop::dereference(_parent->reference()); 39 } 40 41 static const Klass* resolve_klass(const oop obj) { 42 assert(obj != NULL, "invariant"); 43 return java_lang_Class::is_instance(obj) ? 44 java_lang_Class::as_Klass(obj) : obj->klass(); 45 } 46 47 const Klass* Edge::pointee_klass() const { 48 return resolve_klass(pointee()); 49 } 50 51 const Klass* Edge::reference_owner_klass() const { 52 const oop ref_owner = reference_owner(); 53 return ref_owner != NULL ? resolve_klass(ref_owner) : NULL; 54 } 55 56 size_t Edge::distance_to_root() const { 57 size_t depth = 0; 58 const Edge* current = _parent; 59 while (current != NULL) { 60 depth++; 61 current = current->parent(); 62 } 63 return depth; 64 }