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51 lines
1.9 KiB
C++
51 lines
1.9 KiB
C++
/*
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* Copyright Amazon.com Inc. 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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#include "precompiled.hpp"
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#include "oops/markWord.hpp"
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#include "oops/objLayout.hpp"
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#include "runtime/globals.hpp"
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#include "utilities/debug.hpp"
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ObjLayout::Mode ObjLayout::_klass_mode = ObjLayout::Undefined;
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int ObjLayout::_oop_base_offset_in_bytes = 0;
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bool ObjLayout::_oop_has_klass_gap = false;
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void ObjLayout::initialize() {
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assert(_klass_mode == Undefined, "ObjLayout initialized twice");
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if (UseCompactObjectHeaders) {
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_klass_mode = Compact;
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_oop_base_offset_in_bytes = sizeof(markWord);
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_oop_has_klass_gap = false;
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} else if (UseCompressedClassPointers) {
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_klass_mode = Compressed;
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_oop_base_offset_in_bytes = sizeof(markWord) + sizeof(narrowKlass);
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_oop_has_klass_gap = true;
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} else {
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_klass_mode = Uncompressed;
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_oop_base_offset_in_bytes = sizeof(markWord) + sizeof(Klass*);
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_oop_has_klass_gap = false;
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}
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}
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