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annotate src/share/vm/oops/arrayOop.hpp @ 14206:e7b58922266b
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date | Thu, 05 Dec 2013 12:35:38 +0100 |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. 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 * | |
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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. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_OOPS_ARRAYOOP_HPP |
26 #define SHARE_VM_OOPS_ARRAYOOP_HPP | |
27 | |
28 #include "memory/universe.inline.hpp" | |
29 #include "oops/oop.hpp" | |
30 | |
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31 // arrayOopDesc is the abstract baseclass for all arrays. It doesn't |
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32 // declare pure virtual to enforce this because that would allocate a vtbl |
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33 // in each instance, which we don't want. |
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34 |
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35 // The layout of array Oops is: |
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36 // |
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37 // markOop |
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38 // Klass* // 32 bits if compressed but declared 64 in LP64. |
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39 // length // shares klass memory or allocated after declared fields. |
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40 |
0 | 41 |
42 class arrayOopDesc : public oopDesc { | |
43 friend class VMStructs; | |
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44 |
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45 // Interpreter/Compiler offsets |
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46 |
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47 // Header size computation. |
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48 // The header is considered the oop part of this type plus the length. |
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49 // Returns the aligned header_size_in_bytes. This is not equivalent to |
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50 // sizeof(arrayOopDesc) which should not appear in the code. |
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51 static int header_size_in_bytes() { |
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52 size_t hs = align_size_up(length_offset_in_bytes() + sizeof(int), |
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53 HeapWordSize); |
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54 #ifdef ASSERT |
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55 // make sure it isn't called before UseCompressedOops is initialized. |
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56 static size_t arrayoopdesc_hs = 0; |
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57 if (arrayoopdesc_hs == 0) arrayoopdesc_hs = hs; |
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58 assert(arrayoopdesc_hs == hs, "header size can't change"); |
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59 #endif // ASSERT |
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60 return (int)hs; |
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61 } |
0 | 62 |
63 public: | |
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64 // The _length field is not declared in C++. It is allocated after the |
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65 // declared nonstatic fields in arrayOopDesc if not compressed, otherwise |
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66 // it occupies the second half of the _klass field in oopDesc. |
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67 static int length_offset_in_bytes() { |
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68 return UseCompressedClassPointers ? klass_gap_offset_in_bytes() : |
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69 sizeof(arrayOopDesc); |
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70 } |
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71 |
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72 // Returns the offset of the first element. |
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73 static int base_offset_in_bytes(BasicType type) { |
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74 return header_size(type) * HeapWordSize; |
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75 } |
0 | 76 |
77 // Returns the address of the first element. | |
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78 void* base(BasicType type) const { |
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79 return (void*) (((intptr_t) this) + base_offset_in_bytes(type)); |
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80 } |
0 | 81 |
82 // Tells whether index is within bounds. | |
83 bool is_within_bounds(int index) const { return 0 <= index && index < length(); } | |
84 | |
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85 // Accessors for instance variable which is not a C++ declared nonstatic |
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86 // field. |
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87 int length() const { |
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88 return *(int*)(((intptr_t)this) + length_offset_in_bytes()); |
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89 } |
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90 void set_length(int length) { |
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91 *(int*)(((intptr_t)this) + length_offset_in_bytes()) = length; |
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92 } |
0 | 93 |
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94 // Should only be called with constants as argument |
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95 // (will not constant fold otherwise) |
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96 // Returns the header size in words aligned to the requirements of the |
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97 // array object type. |
0 | 98 static int header_size(BasicType type) { |
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99 size_t typesize_in_bytes = header_size_in_bytes(); |
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100 return (int)(Universe::element_type_should_be_aligned(type) |
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101 ? align_object_offset(typesize_in_bytes/HeapWordSize) |
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102 : typesize_in_bytes/HeapWordSize); |
0 | 103 } |
104 | |
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105 // Return the maximum length of an array of BasicType. The length can passed |
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106 // to typeArrayOop::object_size(scale, length, header_size) without causing an |
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107 // overflow. We also need to make sure that this will not overflow a size_t on |
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108 // 32 bit platforms when we convert it to a byte size. |
0 | 109 static int32_t max_array_length(BasicType type) { |
110 assert(type >= 0 && type < T_CONFLICT, "wrong type"); | |
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111 assert(type2aelembytes(type) != 0, "wrong type"); |
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112 |
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113 const size_t max_element_words_per_size_t = |
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114 align_size_down((SIZE_MAX/HeapWordSize - header_size(type)), MinObjAlignment); |
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115 const size_t max_elements_per_size_t = |
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116 HeapWordSize * max_element_words_per_size_t / type2aelembytes(type); |
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117 if ((size_t)max_jint < max_elements_per_size_t) { |
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118 // It should be ok to return max_jint here, but parts of the code |
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119 // (CollectedHeap, Klass::oop_oop_iterate(), and more) uses an int for |
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120 // passing around the size (in words) of an object. So, we need to avoid |
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121 // overflowing an int when we add the header. See CRs 4718400 and 7110613. |
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122 return align_size_down(max_jint - header_size(type), MinObjAlignment); |
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123 } |
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124 return (int32_t)max_elements_per_size_t; |
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125 } |
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126 |
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127 // for unit testing |
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128 #ifndef PRODUCT |
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129 static bool check_max_length_overflow(BasicType type); |
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130 static int32_t old_max_array_length(BasicType type); |
4708 | 131 static void test_max_array_length(); |
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132 #endif |
0 | 133 }; |
1972 | 134 |
135 #endif // SHARE_VM_OOPS_ARRAYOOP_HPP |