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 "classfile/classLoaderDataGraph.hpp"
  27 #include "gc/g1/g1CollectedHeap.hpp"
  28 #include "gc/g1/g1FullCollector.hpp"
  29 #include "gc/g1/g1FullGCMarker.hpp"
  30 #include "gc/g1/g1FullGCMarkTask.hpp"
  31 #include "gc/g1/g1FullGCOopClosures.inline.hpp"
  32 #include "gc/g1/g1FullGCReferenceProcessorExecutor.hpp"
  33 #include "gc/shared/gcTraceTime.inline.hpp"
  34 #include "gc/shared/referenceProcessor.hpp"
  35 #include "memory/iterator.inline.hpp"
  36 
  37 G1FullGCMarkTask::G1FullGCMarkTask(G1FullCollector* collector) :
  38     G1FullGCTask("G1 Parallel Marking Task", collector),
  39     _root_processor(G1CollectedHeap::heap(), collector->workers()),
  40     _terminator(collector->workers(), collector->array_queue_set()) {
  41   // Need cleared claim bits for the roots processing
  42   ClassLoaderDataGraph::clear_claimed_marks();
  43 }
  44 
  45 void G1FullGCMarkTask::work(uint worker_id) {
  46   Ticks start = Ticks::now();
  47   ResourceMark rm;
  48   G1FullGCMarker* marker = collector()->marker(worker_id);
  49   MarkingCodeBlobClosure code_closure(marker->mark_closure(), !CodeBlobToOopClosure::FixRelocations);
  50 
  51   if (ClassUnloading) {
  52     _root_processor.process_strong_roots(
  53         marker->mark_closure(),
  54         marker->cld_closure(),
  55         &code_closure);
  56   } else {
  57     _root_processor.process_all_roots_no_string_table(
  58         marker->mark_closure(),
  59         marker->cld_closure(),
  60         &code_closure);
  61   }
  62 
  63   // Mark stack is populated, now process and drain it.
  64   marker->complete_marking(collector()->oop_queue_set(), collector()->array_queue_set(), &_terminator);
  65 
  66   // This is the point where the entire marking should have completed.
  67   assert(marker->oop_stack()->is_empty(), "Marking should have completed");
  68   assert(marker->objarray_stack()->is_empty(), "Array marking should have completed");
  69   log_task("Marking task", worker_id, start);
  70 }