1 /* 2 * Copyright (c) 2017, 2018, Red Hat, Inc. All rights reserved. 3 * 4 * This code is free software; you can redistribute it and/or modify it 5 * under the terms of the GNU General Public License version 2 only, as 6 * published by the Free Software Foundation. 7 * 8 * This code is distributed in the hope that it will be useful, but WITHOUT 9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 11 * version 2 for more details (a copy is included in the LICENSE file that 12 * accompanied this code). 13 * 14 * You should have received a copy of the GNU General Public License version 15 * 2 along with this work; if not, write to the Free Software Foundation, 16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 17 * 18 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 19 * or visit www.oracle.com if you need additional information or have any 20 * questions. 21 * 22 */ 23 24 #ifndef SHARE_VM_GC_SHENANDOAH_SHENANDOAHSTRINGDEDUP_HPP 25 #define SHARE_VM_GC_SHENANDOAH_SHENANDOAHSTRINGDEDUP_HPP 26 27 #include "gc/shared/stringdedup/stringDedup.hpp" 28 #include "memory/iterator.hpp" 29 30 class ShenandoahStringDedup : public StringDedup { 31 public: 32 // Initialize string deduplication. 33 static void initialize(); 34 35 // Enqueue a string to worker's local string dedup queue 36 static void enqueue_candidate(oop java_string); 37 38 // Deduplicate a string, the call is lock-free 39 static void deduplicate(oop java_string); 40 41 static void parallel_oops_do(OopClosure* cl, uint worker_id); 42 static void oops_do_slow(OopClosure* cl); 43 44 // Parallel cleanup string dedup queues/table 45 static void parallel_cleanup(); 46 47 static inline bool is_candidate(oop obj); 48 private: 49 static void unlink_or_oops_do(BoolObjectClosure* is_alive, 50 OopClosure* keep_alive, 51 bool allow_resize_and_rehash); 52 53 }; 54 55 #endif // SHARE_VM_GC_SHENANDOAH_SHENANDOAHSTRINGDEDUP_HPP