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annotate src/share/vm/oops/instanceOop.hpp @ 12355:cefad50507d8

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Merge with hs25-b53
author Gilles Duboscq <duboscq@ssw.jku.at>
date Fri, 11 Oct 2013 10:38:03 +0200
parents 7944aba7ba41
children de6a9e811145
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1 /*
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2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #ifndef SHARE_VM_OOPS_INSTANCEOOP_HPP
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26 #define SHARE_VM_OOPS_INSTANCEOOP_HPP
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27
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28 #include "oops/oop.hpp"
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29
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30 // An instanceOop is an instance of a Java Class
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31 // Evaluating "new HashTable()" will create an instanceOop.
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32
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33 class instanceOopDesc : public oopDesc {
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34 public:
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35 // aligned header size.
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36 static int header_size() { return sizeof(instanceOopDesc)/HeapWordSize; }
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38 // If compressed, the offset of the fields of the instance may not be aligned.
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39 static int base_offset_in_bytes() {
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40 // offset computation code breaks if UseCompressedClassPointers
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41 // only is true
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42 return (UseCompressedOops && UseCompressedClassPointers) ?
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43 klass_gap_offset_in_bytes() :
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44 sizeof(instanceOopDesc);
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45 }
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46
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47 static bool contains_field_offset(int offset, int nonstatic_field_size) {
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48 int base_in_bytes = base_offset_in_bytes();
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49 return (offset >= base_in_bytes &&
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50 (offset-base_in_bytes) < nonstatic_field_size * heapOopSize);
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51 }
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52 };
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53
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54 #endif // SHARE_VM_OOPS_INSTANCEOOP_HPP