60 lines
2.3 KiB
C++
60 lines
2.3 KiB
C++
/*
|
|
* Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved.
|
|
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
|
|
*
|
|
* This code is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License version 2 only, as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This code is distributed in the hope that it will be useful, but WITHOUT
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
|
* version 2 for more details (a copy is included in the LICENSE file that
|
|
* accompanied this code).
|
|
*
|
|
* You should have received a copy of the GNU General Public License version
|
|
* 2 along with this work; if not, write to the Free Software Foundation,
|
|
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*
|
|
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
|
|
* or visit www.oracle.com if you need additional information or have any
|
|
* questions.
|
|
*
|
|
*/
|
|
|
|
#ifndef SHARE_VM_GC_G1_G1CONCURRENTMARKOBJARRAYPROCESSOR_HPP
|
|
#define SHARE_VM_GC_G1_G1CONCURRENTMARKOBJARRAYPROCESSOR_HPP
|
|
|
|
#include "oops/oopsHierarchy.hpp"
|
|
|
|
class G1CMTask;
|
|
|
|
// Helper class to mark through large objArrays during marking in an efficient way.
|
|
// Instead of pushing large object arrays, we push continuations onto the
|
|
// mark stack. These continuations are identified by having their LSB set.
|
|
// This allows incremental processing of large objects.
|
|
class G1CMObjArrayProcessor {
|
|
private:
|
|
// Reference to the task for doing the actual work.
|
|
G1CMTask* _task;
|
|
|
|
// Push the continuation at the given address onto the mark stack.
|
|
void push_array_slice(HeapWord* addr);
|
|
|
|
// Process (apply the closure) on the given continuation of the given objArray.
|
|
size_t process_array_slice(objArrayOop const obj, HeapWord* start_from, size_t remaining);
|
|
public:
|
|
static bool should_be_sliced(oop obj);
|
|
|
|
G1CMObjArrayProcessor(G1CMTask* task) : _task(task) {
|
|
}
|
|
|
|
// Process the given continuation. Returns the number of words scanned.
|
|
size_t process_slice(HeapWord* slice);
|
|
// Start processing the given objArrayOop by scanning the header and pushing its
|
|
// continuation.
|
|
size_t process_obj(oop obj);
|
|
};
|
|
|
|
#endif /* SHARE_VM_GC_G1_G1CONCURRENTMARKOBJARRAYPROCESSOR_HPP */
|