1 /*
   2  * Copyright (c) 2015, 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 #include "precompiled.hpp"
  25 #include "gc/z/zHeap.inline.hpp"
  26 #include "gc/z/zOopClosures.inline.hpp"
  27 #include "gc/z/zStat.hpp"
  28 #include "gc/z/zTask.hpp"
  29 #include "gc/z/zThread.hpp"
  30 #include "runtime/jniHandles.hpp"
  31 
  32 ZWeakRootsProcessor::ZWeakRootsProcessor(ZWorkers* workers) :
  33     _workers(workers) {}
  34 
  35 class ZProcessWeakRootsTask : public ZTask {
  36 private:
  37   ZWeakRootsIterator _weak_roots;
  38 
  39 public:
  40   ZProcessWeakRootsTask() :
  41       ZTask("ZProcessWeakRootsTask"),
  42       _weak_roots() {}
  43 
  44   virtual void work() {
  45     ZPhantomIsAliveObjectClosure is_alive;
  46     ZPhantomKeepAliveOopClosure keep_alive;
  47     _weak_roots.weak_oops_do(&is_alive, &keep_alive);
  48   }
  49 };
  50 
  51 void ZWeakRootsProcessor::process_weak_roots() {
  52   ZProcessWeakRootsTask task;
  53   _workers->run_parallel(&task);
  54 }
  55 
  56 class ZProcessConcurrentWeakRootsTask : public ZTask {
  57 private:
  58   ZConcurrentWeakRootsIterator _concurrent_weak_roots;
  59 
  60 public:
  61   ZProcessConcurrentWeakRootsTask() :
  62       ZTask("ZProcessConccurentWeakRootsTask"),
  63       _concurrent_weak_roots() {}
  64 
  65   virtual void work() {
  66     ZPhantomCleanOopClosure cl;
  67     _concurrent_weak_roots.oops_do(&cl);
  68   }
  69 };
  70 
  71 void ZWeakRootsProcessor::process_concurrent_weak_roots() {
  72   ZProcessConcurrentWeakRootsTask task;
  73   _workers->run_concurrent(&task);
  74 }