Mercurial > hg > truffle
annotate src/share/vm/memory/metachunk.cpp @ 15250:4c68a0eb69ca
mx: refactored JMH benchmark building and dependency creation out of 'jmh' into 'buildjmh' and 'makejmhdeps' respectively
author | Doug Simon <doug.simon@oracle.com> |
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date | Sat, 19 Apr 2014 00:41:04 +0200 |
parents | ec2e26e26183 |
children | 78bbf4d43a14 |
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1 /* |
12902 | 2 * Copyright (c) 2012, 2013, Oracle and/or its affiliates. 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 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. |
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22 * |
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23 */ |
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24 |
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25 #include "precompiled.hpp" |
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26 #include "memory/allocation.hpp" |
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27 #include "memory/metachunk.hpp" |
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28 #include "utilities/copy.hpp" |
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29 #include "utilities/debug.hpp" |
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30 |
10175 | 31 class VirtualSpaceNode; |
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32 |
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33 const size_t metadata_chunk_initialize = 0xf7f7f7f7; |
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34 |
12902 | 35 size_t Metachunk::object_alignment() { |
12903
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36 // Must align pointers and sizes to 8, |
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37 // so that 64 bit types get correctly aligned. |
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38 const size_t alignment = 8; |
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39 |
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40 // Make sure that the Klass alignment also agree. |
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41 STATIC_ASSERT(alignment == (size_t)KlassAlignmentInBytes); |
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42 |
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43 return alignment; |
12902 | 44 } |
45 | |
46 size_t Metachunk::overhead() { | |
47 return align_size_up(sizeof(Metachunk), object_alignment()) / BytesPerWord; | |
48 } | |
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49 |
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50 // Metachunk methods |
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51 |
10175 | 52 Metachunk::Metachunk(size_t word_size, |
12902 | 53 VirtualSpaceNode* container) |
54 : Metabase<Metachunk>(word_size), | |
10175 | 55 _top(NULL), |
56 _container(container) | |
57 { | |
12902 | 58 _top = initial_top(); |
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59 #ifdef ASSERT |
12902 | 60 set_is_tagged_free(false); |
10175 | 61 size_t data_word_size = pointer_delta(end(), |
12902 | 62 _top, |
10175 | 63 sizeof(MetaWord)); |
12902 | 64 Copy::fill_to_words((HeapWord*)_top, |
10175 | 65 data_word_size, |
66 metadata_chunk_initialize); | |
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67 #endif |
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68 } |
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69 |
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70 MetaWord* Metachunk::allocate(size_t word_size) { |
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71 MetaWord* result = NULL; |
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72 // If available, bump the pointer to allocate. |
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73 if (free_word_size() >= word_size) { |
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74 result = _top; |
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75 _top = _top + word_size; |
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76 } |
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77 return result; |
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78 } |
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79 |
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80 // _bottom points to the start of the chunk including the overhead. |
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81 size_t Metachunk::used_word_size() const { |
12902 | 82 return pointer_delta(_top, bottom(), sizeof(MetaWord)); |
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83 } |
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84 |
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85 size_t Metachunk::free_word_size() const { |
12902 | 86 return pointer_delta(end(), _top, sizeof(MetaWord)); |
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87 } |
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88 |
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89 void Metachunk::print_on(outputStream* st) const { |
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90 st->print_cr("Metachunk:" |
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91 " bottom " PTR_FORMAT " top " PTR_FORMAT |
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92 " end " PTR_FORMAT " size " SIZE_FORMAT, |
12902 | 93 bottom(), _top, end(), word_size()); |
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94 if (Verbose) { |
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95 st->print_cr(" used " SIZE_FORMAT " free " SIZE_FORMAT, |
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96 used_word_size(), free_word_size()); |
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97 } |
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98 } |
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99 |
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100 #ifndef PRODUCT |
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101 void Metachunk::mangle() { |
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102 // Mangle the payload of the chunk and not the links that |
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103 // maintain list of chunks. |
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104 HeapWord* start = (HeapWord*)(bottom() + overhead()); |
12902 | 105 size_t size = word_size() - overhead(); |
106 Copy::fill_to_words(start, size, metadata_chunk_initialize); | |
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107 } |
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108 #endif // PRODUCT |
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109 |
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110 void Metachunk::verify() { |
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111 #ifdef ASSERT |
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112 // Cannot walk through the blocks unless the blocks have |
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113 // headers with sizes. |
12902 | 114 assert(bottom() <= _top && |
115 _top <= (MetaWord*)end(), | |
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116 "Chunk has been smashed"); |
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117 #endif |
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118 return; |
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119 } |
12902 | 120 |
121 /////////////// Unit tests /////////////// | |
122 | |
123 #ifndef PRODUCT | |
124 | |
125 class TestMetachunk { | |
126 public: | |
127 static void test() { | |
128 size_t size = 2 * 1024 * 1024; | |
129 void* memory = malloc(size); | |
130 assert(memory != NULL, "Failed to malloc 2MB"); | |
131 | |
132 Metachunk* metachunk = ::new (memory) Metachunk(size / BytesPerWord, NULL); | |
133 | |
134 assert(metachunk->bottom() == (MetaWord*)metachunk, "assert"); | |
135 assert(metachunk->end() == (uintptr_t*)metachunk + metachunk->size(), "assert"); | |
136 | |
137 // Check sizes | |
138 assert(metachunk->size() == metachunk->word_size(), "assert"); | |
139 assert(metachunk->word_size() == pointer_delta(metachunk->end(), metachunk->bottom(), | |
140 sizeof(MetaWord*)), "assert"); | |
141 | |
142 // Check usage | |
143 assert(metachunk->used_word_size() == metachunk->overhead(), "assert"); | |
144 assert(metachunk->free_word_size() == metachunk->word_size() - metachunk->used_word_size(), "assert"); | |
145 assert(metachunk->top() == metachunk->initial_top(), "assert"); | |
146 assert(metachunk->is_empty(), "assert"); | |
147 | |
148 // Allocate | |
149 size_t alloc_size = 64; // Words | |
150 assert(is_size_aligned(alloc_size, Metachunk::object_alignment()), "assert"); | |
151 | |
152 MetaWord* mem = metachunk->allocate(alloc_size); | |
153 | |
154 // Check post alloc | |
155 assert(mem == metachunk->initial_top(), "assert"); | |
156 assert(mem + alloc_size == metachunk->top(), "assert"); | |
157 assert(metachunk->used_word_size() == metachunk->overhead() + alloc_size, "assert"); | |
158 assert(metachunk->free_word_size() == metachunk->word_size() - metachunk->used_word_size(), "assert"); | |
159 assert(!metachunk->is_empty(), "assert"); | |
160 | |
161 // Clear chunk | |
162 metachunk->reset_empty(); | |
163 | |
164 // Check post clear | |
165 assert(metachunk->used_word_size() == metachunk->overhead(), "assert"); | |
166 assert(metachunk->free_word_size() == metachunk->word_size() - metachunk->used_word_size(), "assert"); | |
167 assert(metachunk->top() == metachunk->initial_top(), "assert"); | |
168 assert(metachunk->is_empty(), "assert"); | |
169 | |
170 free(memory); | |
171 } | |
172 }; | |
173 | |
174 void TestMetachunk_test() { | |
175 TestMetachunk::test(); | |
176 } | |
177 | |
178 #endif |