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annotate src/share/vm/utilities/sizes.hpp @ 1972:f95d63e2154a
6989984: Use standard include model for Hospot
Summary: Replaced MakeDeps and the includeDB files with more standardized solutions.
Reviewed-by: coleenp, kvn, kamg
| author | stefank |
|---|---|
| date | Tue, 23 Nov 2010 13:22:55 -0800 |
| parents | c18cbe5936b8 |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 1972 | 2 * Copyright (c) 2000, 2010, 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_UTILITIES_SIZES_HPP |
| 26 #define SHARE_VM_UTILITIES_SIZES_HPP | |
| 27 | |
| 28 #include "memory/allocation.hpp" | |
| 29 #include "utilities/globalDefinitions.hpp" | |
| 30 | |
| 0 | 31 // The following two classes are used to represent 'sizes' and 'offsets' in the VM; |
| 32 // they serve as 'unit' types. ByteSize is used for sizes measured in bytes, while | |
| 33 // WordSize is used for sizes measured in machine words (i.e., 32bit or 64bit words | |
| 34 // depending on platform). | |
| 35 // | |
| 36 // The classes are defined with friend functions operating on them instead of member | |
| 37 // functions so that they (the classes) can be re-#define'd to int types in optimized | |
| 38 // mode. This allows full type checking and maximum safety in debug mode, and full | |
| 39 // optimizations (constant folding) and zero overhead (time and space wise) in the | |
| 40 // optimized build (some compilers do not optimize one-element value classes but | |
| 41 // instead create an object in memory - thus the overhead may be significant). | |
| 42 // | |
| 43 // Note: 1) DO NOT add new overloaded friend functions that do not have a unique function | |
| 44 // function name but require signature types for resolution. This will not work | |
| 45 // in optimized mode as both, ByteSize and WordSize are mapped to the same type | |
| 46 // and thus the distinction would not be possible anymore (=> compiler errors). | |
| 47 // | |
| 48 // 2) DO NOT add non-static member functions as they cannot be mapped so something | |
| 49 // compilable in the optimized build. Static member functions could be added | |
| 50 // but require a corresponding class definition in the optimized build. | |
| 51 // | |
| 52 // These classes should help doing a transition from (currently) word-size based offsets | |
| 53 // to byte-size based offsets in the VM (this will be important if we desire to pack | |
| 54 // objects more densely in the VM for 64bit machines). Such a transition should proceed | |
| 55 // in two steps to minimize the risk of introducing hard-to-find bugs: | |
| 56 // | |
| 57 // a) first transition the whole VM into a form where all sizes are strongly typed | |
| 58 // b) change all WordSize's to ByteSize's where desired and fix the compilation errors | |
| 59 | |
| 60 | |
| 61 #ifdef ASSERT | |
| 62 | |
| 63 class ByteSize VALUE_OBJ_CLASS_SPEC { | |
| 64 private: | |
| 65 int _size; | |
| 66 | |
| 67 // Note: This constructor must be private to avoid implicit conversions! | |
| 68 ByteSize(int size) { _size = size; } | |
| 69 | |
| 70 public: | |
| 71 // constructors | |
| 72 inline friend ByteSize in_ByteSize(int size); | |
| 73 | |
| 74 // accessors | |
| 75 inline friend int in_bytes(ByteSize x); | |
| 76 | |
| 77 // operators | |
| 78 friend ByteSize operator + (ByteSize x, ByteSize y) { return ByteSize(in_bytes(x) + in_bytes(y)); } | |
| 79 friend ByteSize operator - (ByteSize x, ByteSize y) { return ByteSize(in_bytes(x) - in_bytes(y)); } | |
| 80 friend ByteSize operator * (ByteSize x, int y) { return ByteSize(in_bytes(x) * y ); } | |
| 81 | |
| 82 // comparison | |
| 83 friend bool operator == (ByteSize x, ByteSize y) { return in_bytes(x) == in_bytes(y); } | |
| 84 friend bool operator != (ByteSize x, ByteSize y) { return in_bytes(x) != in_bytes(y); } | |
| 85 friend bool operator < (ByteSize x, ByteSize y) { return in_bytes(x) < in_bytes(y); } | |
| 86 friend bool operator <= (ByteSize x, ByteSize y) { return in_bytes(x) <= in_bytes(y); } | |
| 87 friend bool operator > (ByteSize x, ByteSize y) { return in_bytes(x) > in_bytes(y); } | |
| 88 friend bool operator >= (ByteSize x, ByteSize y) { return in_bytes(x) >= in_bytes(y); } | |
| 89 }; | |
| 90 | |
| 91 inline ByteSize in_ByteSize(int size) { return ByteSize(size); } | |
| 92 inline int in_bytes(ByteSize x) { return x._size; } | |
| 93 | |
| 94 | |
| 95 class WordSize VALUE_OBJ_CLASS_SPEC { | |
| 96 private: | |
| 97 int _size; | |
| 98 | |
| 99 // Note: This constructor must be private to avoid implicit conversions! | |
| 100 WordSize(int size) { _size = size; } | |
| 101 | |
| 102 public: | |
| 103 // constructors | |
| 104 inline friend WordSize in_WordSize(int size); | |
| 105 | |
| 106 // accessors | |
| 107 inline friend int in_words(WordSize x); | |
| 108 | |
| 109 // operators | |
| 110 friend WordSize operator + (WordSize x, WordSize y) { return WordSize(in_words(x) + in_words(y)); } | |
| 111 friend WordSize operator - (WordSize x, WordSize y) { return WordSize(in_words(x) - in_words(y)); } | |
| 112 friend WordSize operator * (WordSize x, int y) { return WordSize(in_words(x) * y ); } | |
| 113 | |
| 114 // comparison | |
| 115 friend bool operator == (WordSize x, WordSize y) { return in_words(x) == in_words(y); } | |
| 116 friend bool operator != (WordSize x, WordSize y) { return in_words(x) != in_words(y); } | |
| 117 friend bool operator < (WordSize x, WordSize y) { return in_words(x) < in_words(y); } | |
| 118 friend bool operator <= (WordSize x, WordSize y) { return in_words(x) <= in_words(y); } | |
| 119 friend bool operator > (WordSize x, WordSize y) { return in_words(x) > in_words(y); } | |
| 120 friend bool operator >= (WordSize x, WordSize y) { return in_words(x) >= in_words(y); } | |
| 121 }; | |
| 122 | |
| 123 inline WordSize in_WordSize(int size) { return WordSize(size); } | |
| 124 inline int in_words(WordSize x) { return x._size; } | |
| 125 | |
| 126 | |
| 127 #else // ASSERT | |
| 128 | |
| 129 // The following definitions must match the corresponding friend declarations | |
| 130 // in the Byte/WordSize classes if they are typedef'ed to be int. This will | |
| 131 // be the case in optimized mode to ensure zero overhead for these types. | |
| 132 // | |
| 133 // Note: If a compiler does not inline these function calls away, one may | |
| 134 // want to use #define's to make sure full optimization (constant | |
| 135 // folding in particular) is possible. | |
| 136 | |
| 137 typedef int ByteSize; | |
| 138 inline ByteSize in_ByteSize(int size) { return size; } | |
| 139 inline int in_bytes (ByteSize x) { return x; } | |
| 140 | |
| 141 typedef int WordSize; | |
| 142 inline WordSize in_WordSize(int size) { return size; } | |
| 143 inline int in_words (WordSize x) { return x; } | |
| 144 | |
| 145 #endif // ASSERT | |
| 146 | |
| 147 | |
| 148 // Use the following #define to get C++ field member offsets | |
| 149 | |
| 150 #define byte_offset_of(klass,field) in_ByteSize((int)offset_of(klass, field)) | |
| 1972 | 151 |
| 152 #endif // SHARE_VM_UTILITIES_SIZES_HPP |