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 

    28 G1FullGCMarker::G1FullGCMarker(uint worker_id, PreservedMarks* preserved_stack, G1CMBitMap* bitmap) :

    29     _worker_id(worker_id),

    30     _mark_closure(worker_id, this, G1CollectedHeap::heap()->ref_processor_stw()),

    31     _verify_closure(VerifyOption_G1UseFullMarking),

    32     _cld_closure(mark_closure()),

    33     _stack_closure(this),

    34     _preserved_stack(preserved_stack),

    35     _bitmap(bitmap) {

    36   _oop_stack.initialize();

    37   _objarray_stack.initialize();

    38 }

    39 

    40 G1FullGCMarker::~G1FullGCMarker() {

    41   assert(is_empty(), "Must be empty at this point");

    42 }

    43 

    44 void G1FullGCMarker::complete_marking(OopQueueSet* oop_stacks,

    45                                       ObjArrayTaskQueueSet* array_stacks,

    46                                       ParallelTaskTerminator* terminator) {

    47   int hash_seed = 17;

    48   do {

    49     drain_stack();

    50     ObjArrayTask steal_array;

    51     if (array_stacks->steal(_worker_id, &hash_seed, steal_array)) {

    52       follow_array_chunk(objArrayOop(steal_array.obj()), steal_array.index());

    53     } else {

    54       oop steal_oop;

    55       if (oop_stacks->steal(_worker_id, &hash_seed, steal_oop)) {

    56         follow_object(steal_oop);

    57       }

    58     }

    59   } while (!is_empty() || !terminator->offer_termination());

    60 }