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_BFSCLOSURE_HPP 26 #define SHARE_VM_JFR_LEAKPROFILER_CHAINS_BFSCLOSURE_HPP 27 28 #include "memory/iterator.hpp" 29 30 class BitSet; 31 class Edge; 32 class EdgeStore; 33 class EdgeQueue; 34 35 // Class responsible for iterating the heap breadth-first 36 class BFSClosure : public ExtendedOopClosure { // XXX BasicOopIterateClosure 37 private: 38 EdgeQueue* _edge_queue; 39 EdgeStore* _edge_store; 40 BitSet* _mark_bits; 41 const Edge* _current_parent; 42 mutable size_t _current_frontier_level; 43 mutable size_t _next_frontier_idx; 44 mutable size_t _prev_frontier_idx; 45 size_t _dfs_fallback_idx; 46 bool _use_dfs; 47 48 void log_completed_frontier() const; 49 void log_dfs_fallback() const; 50 51 bool is_complete() const; 52 void step_frontier() const; 53 54 void closure_impl(const oop* reference, const oop pointee); 55 void add_chain(const oop* reference, const oop pointee); 56 void dfs_fallback(); 57 58 void iterate(const Edge* parent); 59 void process(const oop* reference, const oop pointee); 60 61 void process_root_set(); 62 void process_queue(); 63 64 public: 65 BFSClosure(EdgeQueue* edge_queue, EdgeStore* edge_store, BitSet* mark_bits); 66 void process(); 67 void do_root(const oop* ref); 68 69 virtual void do_oop(oop* ref); 70 virtual void do_oop(narrowOop* ref); 71 }; 72 73 #endif // SHARE_VM_JFR_LEAKPROFILER_CHAINS_BFSCLOSURE_HPP