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 
  25 #ifndef SHARE_VM_JFR_LEAKPROFILER_CHAINS_EDGE_HPP
  26 #define SHARE_VM_JFR_LEAKPROFILER_CHAINS_EDGE_HPP
  27 
  28 #include "memory/allocation.hpp"
  29 #include "oops/oopsHierarchy.hpp"
  30 
  31 class Edge {
  32  private:
  33   const Edge* _parent;
  34   const oop* _reference;
  35  public:
  36   Edge();
  37   Edge(const Edge* parent, const oop* reference);
  38 
  39   const oop* reference() const {
  40     return _reference;
  41   }
  42   const Edge* parent() const {
  43     return _parent;
  44   }
  45   bool is_root() const {
  46     return _parent == NULL;
  47   }
  48   const oop pointee() const;
  49   const Klass* pointee_klass() const;
  50   const oop reference_owner() const;
  51   const Klass* reference_owner_klass() const;
  52   size_t distance_to_root() const;
  53 
  54   void* operator new (size_t sz, void* here) {
  55     return here;
  56   }
  57 };
  58 
  59 #endif // SHARE_VM_JFR_LEAKPROFILER_CHAINS_EDGE_HPP