1 /*
   2  * Copyright (c) 2014, 2019, 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 #include "precompiled.hpp"
  25 
  26 #include "gc/shared/stringdedup/stringDedup.hpp"
  27 #include "gc/shared/stringdedup/stringDedupQueue.hpp"
  28 #include "gc/shared/stringdedup/stringDedupTable.hpp"
  29 #include "gc/shared/stringdedup/stringDedupThread.hpp"
  30 #include "memory/iterator.hpp"
  31 
  32 bool StringDedup::_enabled = false;
  33 
  34 void StringDedup::gc_prologue(bool resize_and_rehash_table) {
  35   assert(is_enabled(), "String deduplication not enabled");
  36   StringDedupQueue::gc_prologue();
  37   StringDedupTable::gc_prologue(resize_and_rehash_table);
  38 
  39 }
  40 void StringDedup::gc_epilogue() {
  41   assert(is_enabled(), "String deduplication not enabled");
  42   StringDedupQueue::gc_epilogue();
  43   StringDedupTable::gc_epilogue();
  44 }
  45 
  46 void StringDedup::stop() {
  47   assert(is_enabled(), "String deduplication not enabled");
  48   StringDedupThread::thread()->stop();
  49 }
  50 
  51 void StringDedup::deduplicate(oop java_string) {
  52   assert(is_enabled(), "String deduplication not enabled");
  53   StringDedupStat dummy; // Statistics from this path is never used
  54   StringDedupTable::deduplicate(java_string, &dummy);
  55 }
  56 
  57 void StringDedup::parallel_unlink(StringDedupUnlinkOrOopsDoClosure* unlink, uint worker_id) {
  58   assert(is_enabled(), "String deduplication not enabled");
  59   StringDedupQueue::unlink_or_oops_do(unlink);
  60   StringDedupTable::unlink_or_oops_do(unlink, worker_id);
  61 }
  62 
  63 void StringDedup::threads_do(ThreadClosure* tc) {
  64   assert(is_enabled(), "String deduplication not enabled");
  65   tc->do_thread(StringDedupThread::thread());
  66 }
  67 
  68 void StringDedup::print_worker_threads_on(outputStream* st) {
  69   assert(is_enabled(), "String deduplication not enabled");
  70   StringDedupThread::thread()->print_on(st);
  71   st->cr();
  72 }
  73 
  74 void StringDedup::verify() {
  75   assert(is_enabled(), "String deduplication not enabled");
  76   StringDedupQueue::verify();
  77   StringDedupTable::verify();
  78 }
  79 
  80 
  81 StringDedupUnlinkOrOopsDoClosure::StringDedupUnlinkOrOopsDoClosure(BoolObjectClosure* is_alive,
  82                                                                    OopClosure* keep_alive) :
  83   _always_true(),
  84   _do_nothing(),
  85   _is_alive(is_alive != NULL ? is_alive : &_always_true),
  86   _keep_alive(keep_alive != NULL ? keep_alive : &_do_nothing) {
  87 }