Mercurial > hg > truffle
annotate agent/src/share/classes/sun/jvm/hotspot/oops/Array.java @ 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 |
|---|---|
| date | Sun, 13 Apr 2008 17:43:42 -0400 |
| parents | a61af66fc99e |
| children | d1605aabd0a1 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 * Copyright 2000-2007 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 package sun.jvm.hotspot.oops; | |
| 26 | |
| 27 import java.util.*; | |
| 28 import sun.jvm.hotspot.debugger.*; | |
| 29 import sun.jvm.hotspot.memory.*; | |
| 30 import sun.jvm.hotspot.runtime.*; | |
| 31 import sun.jvm.hotspot.types.*; | |
| 32 | |
| 33 // Array is an abstract superclass for TypeArray and ObjArray | |
| 34 | |
| 35 public class Array extends Oop { | |
| 36 static { | |
| 37 VM.registerVMInitializedObserver(new Observer() { | |
| 38 public void update(Observable o, Object data) { | |
| 39 initialize(VM.getVM().getTypeDataBase()); | |
| 40 } | |
| 41 }); | |
| 42 } | |
| 43 | |
| 44 Array(OopHandle handle, ObjectHeap heap) { | |
| 45 super(handle, heap); | |
| 46 } | |
| 47 | |
| 48 private static void initialize(TypeDataBase db) throws WrongTypeException { | |
| 49 Type type = db.lookupType("arrayOopDesc"); | |
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50 typeSize = (int)type.getSize(); |
| 0 | 51 } |
| 52 | |
| 53 // Size of the arrayOopDesc | |
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54 private static long headerSize=0; |
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55 private static long lengthOffsetInBytes=0; |
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56 private static long typeSize; |
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57 |
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58 private static long headerSizeInBytes() { |
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59 if (headerSize != 0) { |
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60 return headerSize; |
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61 } |
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62 if (VM.getVM().isCompressedOopsEnabled()) { |
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63 headerSize = typeSize; |
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64 } else { |
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65 headerSize = VM.getVM().alignUp(typeSize + VM.getVM().getIntSize(), |
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66 VM.getVM().getHeapWordSize()); |
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67 } |
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68 return headerSize; |
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69 } |
| 0 | 70 |
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71 private static long headerSize(BasicType type) { |
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72 if (Universe.elementTypeShouldBeAligned(type)) { |
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73 return alignObjectSize(headerSizeInBytes())/VM.getVM().getHeapWordSize(); |
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74 } else { |
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75 return headerSizeInBytes()/VM.getVM().getHeapWordSize(); |
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76 } |
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77 } |
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78 |
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79 private long lengthOffsetInBytes() { |
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80 if (lengthOffsetInBytes != 0) { |
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81 return lengthOffsetInBytes; |
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82 } |
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83 if (VM.getVM().isCompressedOopsEnabled()) { |
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84 lengthOffsetInBytes = typeSize - VM.getVM().getIntSize(); |
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85 } else { |
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86 lengthOffsetInBytes = typeSize; |
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87 } |
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88 return lengthOffsetInBytes; |
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89 } |
| 0 | 90 |
| 91 // Accessors for declared fields | |
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92 public long getLength() { |
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93 boolean isUnsigned = true; |
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94 return this.getHandle().getCIntegerAt(lengthOffsetInBytes(), VM.getVM().getIntSize(), isUnsigned); |
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95 } |
| 0 | 96 |
| 97 public long getObjectSize() { | |
| 98 ArrayKlass klass = (ArrayKlass) getKlass(); | |
| 99 // We have to fetch the length of the array, shift (multiply) it | |
| 100 // appropriately, up to wordSize, add the header, and align to | |
| 101 // object size. | |
| 102 long s = getLength() << klass.getLog2ElementSize(); | |
| 103 s += klass.getArrayHeaderInBytes(); | |
| 104 s = Oop.alignObjectSize(s); | |
| 105 return s; | |
| 106 } | |
| 107 | |
| 108 public static long baseOffsetInBytes(BasicType type) { | |
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109 return headerSize(type) * VM.getVM().getHeapWordSize(); |
| 0 | 110 } |
| 111 | |
| 112 public boolean isArray() { return true; } | |
| 113 | |
| 114 public void iterateFields(OopVisitor visitor, boolean doVMFields) { | |
| 115 super.iterateFields(visitor, doVMFields); | |
| 116 } | |
| 117 } |