apetushkov@9858: /*
apetushkov@9858:  * Copyright (c) 2014, 2018, Oracle and/or its affiliates. All rights reserved.
apetushkov@9858:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
apetushkov@9858:  *
apetushkov@9858:  * This code is free software; you can redistribute it and/or modify it
apetushkov@9858:  * under the terms of the GNU General Public License version 2 only, as
apetushkov@9858:  * published by the Free Software Foundation.
apetushkov@9858:  *
apetushkov@9858:  * This code is distributed in the hope that it will be useful, but WITHOUT
apetushkov@9858:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
apetushkov@9858:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
apetushkov@9858:  * version 2 for more details (a copy is included in the LICENSE file that
apetushkov@9858:  * accompanied this code).
apetushkov@9858:  *
apetushkov@9858:  * You should have received a copy of the GNU General Public License version
apetushkov@9858:  * 2 along with this work; if not, write to the Free Software Foundation,
apetushkov@9858:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
apetushkov@9858:  *
apetushkov@9858:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
apetushkov@9858:  * or visit www.oracle.com if you need additional information or have any
apetushkov@9858:  * questions.
apetushkov@9858:  *
apetushkov@9858:  */
apetushkov@9858: 
apetushkov@9858: #ifndef SHARE_VM_LEAKPROFILER_CHAINS_EDGESTORE_HPP
apetushkov@9858: #define SHARE_VM_LEAKPROFILER_CHAINS_EDGESTORE_HPP
apetushkov@9858: 
ddong@9885: #include "jfr/leakprofiler/chains/edge.hpp"
apetushkov@9858: #include "jfr/utilities/jfrHashtable.hpp"
apetushkov@9858: #include "memory/allocation.hpp"
apetushkov@9858: 
apetushkov@9858: typedef u8 traceid;
apetushkov@9858: 
ddong@9885: class StoredEdge : public Edge {
apetushkov@9858:  private:
ddong@9885:   mutable traceid _gc_root_id;
ddong@9885:   size_t _skip_length;
apetushkov@9858: 
apetushkov@9858:  public:
ddong@9885:   StoredEdge();
ddong@9885:   StoredEdge(const Edge* parent, const oop* reference);
ddong@9885:   StoredEdge(const Edge& edge);
ddong@9885:   StoredEdge(const StoredEdge& edge);
ddong@9885:   void operator=(const StoredEdge& edge);
apetushkov@9858: 
ddong@9885:   traceid gc_root_id() const { return _gc_root_id; }
ddong@9885:   void set_gc_root_id(traceid root_id) const { _gc_root_id = root_id; }
ddong@9885: 
ddong@9885:   bool is_skip_edge() const { return _skip_length != 0; }
apetushkov@9858:   size_t skip_length() const { return _skip_length; }
ddong@9885:   void set_skip_length(size_t length) { _skip_length = length; }
apetushkov@9858: 
ddong@9885:   void set_parent(const Edge* edge) { this->_parent = edge; }
ddong@9885: 
ddong@9885:   StoredEdge* parent() const {
ddong@9885:     return const_cast<StoredEdge*>(static_cast<const StoredEdge*>(Edge::parent()));
apetushkov@9858:   }
apetushkov@9858: };
apetushkov@9858: 
apetushkov@9858: class EdgeStore : public CHeapObj<mtTracing> {
ddong@9885:   typedef HashTableHost<StoredEdge, traceid, Entry, EdgeStore> EdgeHashTable;
apetushkov@9858:   typedef EdgeHashTable::HashEntry EdgeEntry;
apetushkov@9858:   template <typename,
apetushkov@9858:             typename,
apetushkov@9858:             template<typename, typename> class,
apetushkov@9858:             typename,
apetushkov@9858:             size_t>
apetushkov@9858:   friend class HashTableHost;
ddong@9885:   friend class EventEmitter;
ddong@9885:   friend class ObjectSampleWriter;
ddong@9885:   friend class ObjectSampleCheckpoint;
apetushkov@9858:  private:
apetushkov@9858:   static traceid _edge_id_counter;
apetushkov@9858:   EdgeHashTable* _edges;
apetushkov@9858: 
apetushkov@9858:   // Hash table callbacks
apetushkov@9858:   void assign_id(EdgeEntry* entry);
apetushkov@9858:   bool equals(const Edge& query, uintptr_t hash, const EdgeEntry* entry);
apetushkov@9858: 
ddong@9885:   StoredEdge* get(const oop* reference) const;
ddong@9885:   StoredEdge* put(const oop* reference);
ddong@9885:   traceid gc_root_id(const Edge* edge) const;
ddong@9885: 
ddong@9885:   bool put_edges(StoredEdge** previous, const Edge** current, size_t length);
ddong@9885:   bool put_skip_edge(StoredEdge** previous, const Edge** current, size_t distance_to_root);
ddong@9885:   void put_chain_epilogue(StoredEdge* leak_context_edge, const Edge* root) const;
ddong@9885: 
ddong@9885:   StoredEdge* associate_leak_context_with_candidate(const Edge* edge);
ddong@9885:   void store_gc_root_id_in_leak_context_edge(StoredEdge* leak_context_edge, const Edge* root) const;
ddong@9885:   StoredEdge* link_new_edge(StoredEdge** previous, const Edge** current);
ddong@9885:   void link_with_existing_chain(const StoredEdge* current_stored, StoredEdge** previous, size_t previous_length);
ddong@9885: 
ddong@9885:   template <typename T>
ddong@9885:   void iterate(T& functor) const { _edges->iterate_value<T>(functor); }
ddong@9885: 
ddong@9885:   DEBUG_ONLY(bool contains(const oop* reference) const;)
apetushkov@9858: 
apetushkov@9858:  public:
apetushkov@9858:   EdgeStore();
apetushkov@9858:   ~EdgeStore();
apetushkov@9858: 
apetushkov@9858:   bool is_empty() const;
apetushkov@9858:   traceid get_id(const Edge* edge) const;
ddong@9885:   void put_chain(const Edge* chain, size_t length);
apetushkov@9858: };
apetushkov@9858: 
apetushkov@9858: #endif // SHARE_VM_LEAKPROFILER_CHAINS_EDGESTORE_HPP