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