70 lines
2.4 KiB
C++
70 lines
2.4 KiB
C++
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/*
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* Copyright (c) 2015, 2019, 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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#ifndef SHARE_GC_Z_ZFORWARDING_HPP
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#define SHARE_GC_Z_ZFORWARDING_HPP
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#include "gc/z/zForwardingEntry.hpp"
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typedef uint32_t ZForwardingCursor;
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class ZForwarding {
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friend class VMStructs;
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friend class ZForwardingTest;
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private:
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const uintptr_t _start;
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const size_t _object_alignment_shift;
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const uint32_t _nentries;
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volatile uint32_t _refcount;
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volatile bool _pinned;
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ZForwardingEntry* entries() const;
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ZForwardingEntry at(ZForwardingCursor* cursor) const;
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ZForwardingEntry first(uintptr_t from_index, ZForwardingCursor* cursor) const;
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ZForwardingEntry next(ZForwardingCursor* cursor) const;
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ZForwarding(uintptr_t start, size_t object_alignment_shift, uint32_t nentries);
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public:
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static ZForwarding* create(uintptr_t start, size_t object_alignment_shift, uint32_t live_objects);
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static void destroy(ZForwarding* forwarding);
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uintptr_t start() const;
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size_t object_alignment_shift() const;
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bool inc_refcount();
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bool dec_refcount();
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bool is_pinned() const;
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void set_pinned();
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ZForwardingEntry find(uintptr_t from_index) const;
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ZForwardingEntry find(uintptr_t from_index, ZForwardingCursor* cursor) const;
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uintptr_t insert(uintptr_t from_index, uintptr_t to_offset, ZForwardingCursor* cursor);
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void verify(uint32_t object_max_count, uint32_t live_objects) const;
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};
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#endif // SHARE_GC_Z_ZFORWARDING_HPP
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