jfrNode.hpp

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
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 * 2 along with this work; if not, write to the Free Software Foundation,
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#ifndef SHARE_JFR_UTILITIES_JFRNODE_HPP
#define SHARE_JFR_UTILITIES_JFRNODE_HPP

#include "jfr/utilities/jfrTypes.hpp"
#include "memory/allocation.hpp"
#include "runtime/atomic.hpp"

const uint64_t JFR_NODE_LOGICAL_EXCISION_BIT = 1;
const uint64_t JFR_NODE_LOGICAL_INSERTION_BIT = 2;
const uint64_t JFR_NODE_MASK = ~(JFR_NODE_LOGICAL_INSERTION_BIT | JFR_NODE_LOGICAL_EXCISION_BIT);

template <typename Node>
inline bool cas(Node** address, Node* current, Node* exchange) {
  return Atomic::cmpxchg(address, current, exchange) == current;
}

template <typename Node>
inline bool is_marked_for_removal(const Node* ptr) {
  return ((uint64_t)ptr & JFR_NODE_LOGICAL_EXCISION_BIT) == JFR_NODE_LOGICAL_EXCISION_BIT;
}

template <typename Node>
inline bool is_marked_for_insertion(const Node* ptr) {
  return ((uint64_t)ptr & JFR_NODE_LOGICAL_INSERTION_BIT) == JFR_NODE_LOGICAL_INSERTION_BIT;
}

template <typename Node>
inline Node* set_excision_bit(const Node* ptr) {
  return (Node*)(((uint64_t)ptr) | JFR_NODE_LOGICAL_EXCISION_BIT);
}

template <typename Node>
inline Node* set_insertion_bit(const Node* ptr) {
  return (Node*)(((uint64_t)ptr) | JFR_NODE_LOGICAL_INSERTION_BIT);
}

template <typename Node>
inline Node* unmask(const Node* ptr) {
  return (Node*)(((uint64_t)ptr) & JFR_NODE_MASK);
}

template <typename Derived, typename Version = traceid>
class JfrLinkedNode : public ResourceObj {
 public:
  typedef Version VersionType;
  Derived* _next;
  JfrLinkedNode() : _next(NULL) {}
  JfrLinkedNode(JfrLinkedNode<Derived, VersionType>* next) : _next(next) {}
};

template <typename V>
class JfrKeyIsThisNode : public JfrLinkedNode<JfrKeyIsThisNode<V> > {
 private:
  V _value;
 public:
  typedef V Value;
  typedef const JfrKeyIsThisNode<V>* Key;
  JfrKeyIsThisNode(const Value value = NULL) : JfrLinkedNode<JfrKeyIsThisNode<V> >(), _value(value) {}
  Key key() const { return this; }
  Value value() const { return _value; }
  void set_value(Value value) { _value = value; }
};

template <typename V>
class JfrValueNode : public JfrLinkedNode<JfrValueNode<V> > {
 private:
  V _value;
 public:
  typedef V Value;
  typedef Value Key;
  JfrValueNode(const Value value = NULL) : JfrLinkedNode<JfrValueNode<V> >(), _value(value) {}
  Key key() const { return value(); }
  Value value() const { return _value; }
  void set_value(Value value) { _value = value; }
};

template <typename V>
class JfrKeyIsFreeSizeNode : public JfrLinkedNode<JfrKeyIsFreeSizeNode<V> > {
 private:
  V _value;
 public:
  typedef V Value;
  typedef size_t Key;
  JfrKeyIsFreeSizeNode(const Value value = NULL) : JfrLinkedNode<JfrKeyIsFreeSizeNode<V> >(), _value(value) {}
  Key key() const { return value()->free_size(); }
  Value value() const { return _value; }
  void set_value(Value value) { _value = value; }
};

#endif // SHARE_JFR_UTILITIES_JFRNODE_HPP