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_GC_SHENANDOAH_SHENANDOAHSTRINGDEDUP_HPP 25 #define SHARE_GC_SHENANDOAH_SHENANDOAHSTRINGDEDUP_HPP 26 27 #include "classfile/javaClasses.inline.hpp" 28 #include "gc/shared/stringdedup/stringDedup.hpp" 29 #include "memory/iterator.hpp" 30 31 class ShenandoahStringDedup : public StringDedup { 32 public: 33 // Initialize string deduplication. 34 static void initialize(); 35 36 // Enqueue a string to worker's local string dedup queue 37 static void enqueue_candidate(oop java_string); 38 39 // Deduplicate a string, the call is lock-free 40 static void deduplicate(oop java_string); 41 42 static void parallel_oops_do(OopClosure* cl, uint worker_id); 43 static void oops_do_slow(OopClosure* cl); 44 45 static inline bool is_candidate(oop obj) { 46 return java_lang_String::is_instance_inlined(obj) && 47 java_lang_String::value(obj) != NULL; 48 } 49 private: 50 static void unlink_or_oops_do(BoolObjectClosure* is_alive, 51 OopClosure* keep_alive, 52 bool allow_resize_and_rehash); 53 54 }; 55 56 #endif // SHARE_GC_SHENANDOAH_SHENANDOAHSTRINGDEDUP_HPP