Mercurial > hg > graal-jvmci-8
annotate src/share/vm/oops/objArrayOop.hpp @ 1138:dd57230ba8fe
6893268: additional dynamic language related optimizations in C2
Summary: C2 needs some additional optimizations to be able to handle MethodHandle invokes and invokedynamic instructions at the best performance.
Reviewed-by: kvn, never
author | twisti |
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date | Tue, 05 Jan 2010 15:21:25 +0100 |
parents | 7bfd295ec074 |
children | c18cbe5936b8 |
rev | line source |
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0 | 1 /* |
948 | 2 * Copyright 1997-2009 Sun Microsystems, Inc. All Rights Reserved. |
0 | 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 objArrayOop is an array containing oops. | |
26 // Evaluating "String arg[10]" will create an objArrayOop. | |
27 | |
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 friend class CSMarkOopClosure; |
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33 friend class G1ParScanPartialArrayClosure; |
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34 |
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35 template <class T> T* obj_at_addr(int index) const { |
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36 assert(is_within_bounds(index), "index out of bounds"); |
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37 return &((T*)base())[index]; |
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38 } |
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39 |
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40 private: |
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41 // Give size of objArrayOop in HeapWords minus the header |
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42 static int array_size(int length) { |
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43 const int OopsPerHeapWord = HeapWordSize/heapOopSize; |
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44 assert(OopsPerHeapWord >= 1 && (HeapWordSize % heapOopSize == 0), |
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45 "Else the following (new) computation would be in error"); |
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46 #ifdef ASSERT |
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47 // The old code is left in for sanity-checking; it'll |
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48 // go away pretty soon. XXX |
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49 // Without UseCompressedOops, this is simply: |
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50 // oop->length() * HeapWordsPerOop; |
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51 // With narrowOops, HeapWordsPerOop is 1/2 or equal 0 as an integer. |
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52 // The oop elements are aligned up to wordSize |
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53 const int HeapWordsPerOop = heapOopSize/HeapWordSize; |
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54 int old_res; |
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55 if (HeapWordsPerOop > 0) { |
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56 old_res = length * HeapWordsPerOop; |
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57 } else { |
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58 old_res = align_size_up(length, OopsPerHeapWord)/OopsPerHeapWord; |
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59 } |
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60 #endif // ASSERT |
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61 int res = ((uint)length + OopsPerHeapWord - 1)/OopsPerHeapWord; |
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62 assert(res == old_res, "Inconsistency between old and new."); |
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63 return res; |
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64 } |
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65 |
0 | 66 public: |
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67 // Returns the offset of the first element. |
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68 static int base_offset_in_bytes() { |
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69 return arrayOopDesc::base_offset_in_bytes(T_OBJECT); |
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70 } |
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71 |
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72 // base is the address following the header. |
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73 HeapWord* base() const { return (HeapWord*) arrayOopDesc::base(T_OBJECT); } |
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74 |
0 | 75 // Accessing |
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76 oop obj_at(int index) const { |
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77 // With UseCompressedOops decode the narrow oop in the objArray to an |
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78 // uncompressed oop. Otherwise this is simply a "*" operator. |
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79 if (UseCompressedOops) { |
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80 return load_decode_heap_oop(obj_at_addr<narrowOop>(index)); |
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81 } else { |
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82 return load_decode_heap_oop(obj_at_addr<oop>(index)); |
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83 } |
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84 } |
0 | 85 |
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86 void obj_at_put(int index, oop value) { |
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87 if (UseCompressedOops) { |
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88 oop_store(obj_at_addr<narrowOop>(index), value); |
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89 } else { |
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90 oop_store(obj_at_addr<oop>(index), value); |
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91 } |
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92 } |
0 | 93 // Sizing |
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94 static int header_size() { return arrayOopDesc::header_size(T_OBJECT); } |
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95 int object_size() { return object_size(length()); } |
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96 |
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97 static int object_size(int length) { |
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98 // This returns the object size in HeapWords. |
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99 uint asz = array_size(length); |
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100 uint osz = align_object_size(header_size() + asz); |
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101 assert(osz >= asz, "no overflow"); |
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102 assert((int)osz > 0, "no overflow"); |
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103 return (int)osz; |
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104 } |
0 | 105 |
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106 // special iterators for index ranges, returns size of object |
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107 #define ObjArrayOop_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \ |
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108 int oop_iterate_range(OopClosureType* blk, int start, int end); |
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109 |
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110 ALL_OOP_OOP_ITERATE_CLOSURES_1(ObjArrayOop_OOP_ITERATE_DECL) |
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111 ALL_OOP_OOP_ITERATE_CLOSURES_2(ObjArrayOop_OOP_ITERATE_DECL) |
0 | 112 }; |