Mercurial > hg > graal-compiler
annotate src/share/vm/oops/instanceOop.hpp @ 113:ba764ed4b6f2
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
Summary: Compressed oops in instances, arrays, and headers. Code contributors are coleenp, phh, never, swamyv
Reviewed-by: jmasa, kamg, acorn, tbell, kvn, rasbold
author | coleenp |
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date | Sun, 13 Apr 2008 17:43:42 -0400 |
parents | a61af66fc99e |
children | 437d03ea40b1 |
rev | line source |
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0 | 1 /* |
2 * Copyright 1997-2000 Sun Microsystems, Inc. All Rights Reserved. | |
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 // An instanceOop is an instance of a Java Class | |
26 // Evaluating "new HashTable()" will create an instanceOop. | |
27 | |
28 class instanceOopDesc : public oopDesc { | |
29 public: | |
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30 // aligned header size. |
0 | 31 static int header_size() { return sizeof(instanceOopDesc)/HeapWordSize; } |
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32 |
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33 // If compressed, the offset of the fields of the instance may not be aligned. |
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34 static int base_offset_in_bytes() { |
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35 return UseCompressedOops ? |
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36 klass_gap_offset_in_bytes() : |
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37 sizeof(instanceOopDesc); |
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38 } |
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39 |
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40 static bool contains_field_offset(int offset, int nonstatic_field_size) { |
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41 int base_in_bytes = base_offset_in_bytes(); |
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42 if (UseCompressedOops) { |
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43 return (offset >= base_in_bytes && |
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44 // field can be embedded in header, or is after header. |
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45 (offset < (int)sizeof(instanceOopDesc) || |
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46 (offset-(int)sizeof(instanceOopDesc))/wordSize < nonstatic_field_size)); |
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47 } else { |
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48 return (offset >= base_in_bytes && |
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49 (offset-base_in_bytes)/wordSize < nonstatic_field_size); |
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50 } |
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51 } |
0 | 52 }; |