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annotate src/share/vm/oops/objArrayOop.hpp @ 113:ba764ed4b6f2

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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 37f87013dfd8
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1 /*
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2 * Copyright 1997-2003 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 // An objArrayOop is an array containing oops.
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26 // Evaluating "String arg[10]" will create an objArrayOop.
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27
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28 class objArrayOopDesc : public arrayOopDesc {
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29 friend class objArrayKlass;
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30 friend class Runtime1;
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31 friend class psPromotionManager;
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32
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33 template <class T> T* obj_at_addr(int index) const {
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34 assert(is_within_bounds(index), "index out of bounds");
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35 return &((T*)base())[index];
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36 }
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37
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38 public:
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39 // base is the address following the header.
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40 HeapWord* base() const { return (HeapWord*) arrayOopDesc::base(T_OBJECT); }
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41
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42 // Accessing
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43 oop obj_at(int index) const {
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44 // With UseCompressedOops decode the narrow oop in the objArray to an
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45 // uncompressed oop. Otherwise this is simply a "*" operator.
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46 if (UseCompressedOops) {
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47 return load_decode_heap_oop(obj_at_addr<narrowOop>(index));
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48 } else {
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49 return load_decode_heap_oop(obj_at_addr<oop>(index));
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50 }
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51 }
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52
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53 void obj_at_put(int index, oop value) {
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54 if (UseCompressedOops) {
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55 oop_store(obj_at_addr<narrowOop>(index), value);
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56 } else {
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57 oop_store(obj_at_addr<oop>(index), value);
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58 }
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59 }
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60 // Sizing
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61 static int header_size() { return arrayOopDesc::header_size(T_OBJECT); }
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62 int object_size() { return object_size(length()); }
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63 int array_size() { return array_size(length()); }
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64
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65 static int object_size(int length) {
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66 // This returns the object size in HeapWords.
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67 return align_object_size(header_size() + array_size(length));
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68 }
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69
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70 // Give size of objArrayOop in HeapWords minus the header
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71 static int array_size(int length) {
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72 // Without UseCompressedOops, this is simply:
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73 // oop->length() * HeapWordsPerOop;
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74 // With narrowOops, HeapWordsPerOop is 1/2 or equal 0 as an integer.
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75 // The oop elements are aligned up to wordSize
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76 const int HeapWordsPerOop = heapOopSize/HeapWordSize;
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77 if (HeapWordsPerOop > 0) {
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78 return length * HeapWordsPerOop;
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79 } else {
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80 const int OopsPerHeapWord = HeapWordSize/heapOopSize;
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81 int word_len = align_size_up(length, OopsPerHeapWord)/OopsPerHeapWord;
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82 return word_len;
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83 }
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84 }
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85
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86 // special iterators for index ranges, returns size of object
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87 #define ObjArrayOop_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \
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88 int oop_iterate_range(OopClosureType* blk, int start, int end);
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89
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90 ALL_OOP_OOP_ITERATE_CLOSURES_1(ObjArrayOop_OOP_ITERATE_DECL)
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91 ALL_OOP_OOP_ITERATE_CLOSURES_3(ObjArrayOop_OOP_ITERATE_DECL)
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92 };