1 /*
   2  * Copyright (c) 2017, 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 
  25 #include "precompiled.hpp"
  26 #include "gc/g1/g1FullGCMarker.inline.hpp"
  27 #include "gc/shared/referenceProcessor.hpp"
  28 
  29 G1FullGCMarker::G1FullGCMarker(uint worker_id, PreservedMarks* preserved_stack, G1CMBitMap* bitmap) :
  30     _worker_id(worker_id),
  31     _mark_closure(worker_id, this, G1CollectedHeap::heap()->ref_processor_stw()),
  32     _verify_closure(VerifyOption_G1UseFullMarking),
  33     _cld_closure(mark_closure()),
  34     _stack_closure(this),
  35     _preserved_stack(preserved_stack),
  36     _bitmap(bitmap) {
  37   _oop_stack.initialize();
  38   _objarray_stack.initialize();
  39 }
  40 
  41 G1FullGCMarker::~G1FullGCMarker() {
  42   assert(is_empty(), "Must be empty at this point");
  43 }
  44 
  45 void G1FullGCMarker::complete_marking(OopQueueSet* oop_stacks,
  46                                       ObjArrayTaskQueueSet* array_stacks,
  47                                       ParallelTaskTerminator* terminator) {
  48   int hash_seed = 17;
  49   do {
  50     drain_stack();
  51     ObjArrayTask steal_array;
  52     if (array_stacks->steal(_worker_id, &hash_seed, steal_array)) {
  53       follow_array_chunk(objArrayOop(steal_array.obj()), steal_array.index());
  54     } else {
  55       oop steal_oop;
  56       if (oop_stacks->steal(_worker_id, &hash_seed, steal_oop)) {
  57         follow_object(steal_oop);
  58       }
  59     }
  60   } while (!is_empty() || !terminator->offer_termination());
  61 }