71 lines
2.8 KiB
C++
71 lines
2.8 KiB
C++
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/*
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* Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#ifndef SHARE_VM_GC_G1_G1CONCURRENTMARKOBJARRAYPROCESSOR_HPP
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#define SHARE_VM_GC_G1_G1CONCURRENTMARKOBJARRAYPROCESSOR_HPP
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#include "oops/oopsHierarchy.hpp"
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#include "memory/allocation.hpp"
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class G1CMTask;
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// Helper class to mark through large objArrays during marking in an efficient way.
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// Instead of pushing large object arrays, we push continuations onto the
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// mark stack. These continuations are identified by having their LSB set.
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// This allows incremental processing of large objects.
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class G1CMObjArrayProcessor VALUE_OBJ_CLASS_SPEC {
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private:
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// The bit mask for the continuation indicator of elements on the mark stack.
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static const size_t ArraySliceBit = 1;
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// Reference to the task for doing the actual work.
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G1CMTask* _task;
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// Encodes the given address as a continuation "oop".
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oop encode_array_slice(HeapWord* addr);
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// Remove the continuation marker from the given oop from the mark stack.
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HeapWord* decode_array_slice(oop value);
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// Push the continuation at the given address onto the mark stack.
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void push_array_slice(HeapWord* addr);
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// Process (apply the closure) on the given continuation of the given objArray.
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size_t process_array_slice(objArrayOop const obj, HeapWord* start_from, size_t remaining);
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public:
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static bool is_array_slice(void* obj) { return ((uintptr_t)obj & ArraySliceBit) != 0; }
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static bool should_be_sliced(oop obj);
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G1CMObjArrayProcessor(G1CMTask* task) : _task(task) {
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}
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// Process the given continuation "oop". Returns the number of words scanned.
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size_t process_slice(oop obj);
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// Start processing the given objArrayOop by scanning the header and pushing its
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// continuation.
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size_t process_obj(oop obj);
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};
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#endif /* SHARE_VM_GC_G1_G1CONCURRENTMARKOBJARRAYPROCESSOR_HPP */
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