1 /*
2 * Copyright (c) 2012, 2014, Oracle and/or its affiliates. All rights reserved.
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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
94 void Metachunk::mangle(juint word_value) {
95 // Overwrite the payload of the chunk and not the links that
96 // maintain list of chunks.
97 HeapWord* start = (HeapWord*)initial_top();
98 size_t size = word_size() - overhead();
99 Copy::fill_to_words(start, size, word_value);
100 }
101 #endif // PRODUCT
102
103 void Metachunk::verify() {
104 #ifdef ASSERT
105 // Cannot walk through the blocks unless the blocks have
106 // headers with sizes.
107 assert(bottom() <= _top &&
108 _top <= (MetaWord*)end(),
109 "Chunk has been smashed");
110 #endif
111 return;
112 }
113
114 /////////////// Unit tests ///////////////
115
116 #ifndef PRODUCT
117
118 class TestMetachunk {
119 public:
120 static void test() {
121 size_t size = 2 * 1024 * 1024;
122 void* memory = malloc(size);
123 assert(memory != NULL, "Failed to malloc 2MB");
124
125 Metachunk* metachunk = ::new (memory) Metachunk(size / BytesPerWord, NULL);
126
127 assert(metachunk->bottom() == (MetaWord*)metachunk, "assert");
128 assert(metachunk->end() == (uintptr_t*)metachunk + metachunk->size(), "assert");
129
130 // Check sizes
131 assert(metachunk->size() == metachunk->word_size(), "assert");
132 assert(metachunk->word_size() == pointer_delta(metachunk->end(), metachunk->bottom(),
133 sizeof(MetaWord*)), "assert");
134
135 // Check usage
136 assert(metachunk->used_word_size() == metachunk->overhead(), "assert");
137 assert(metachunk->free_word_size() == metachunk->word_size() - metachunk->used_word_size(), "assert");
138 assert(metachunk->top() == metachunk->initial_top(), "assert");
139 assert(metachunk->is_empty(), "assert");
140
141 // Allocate
142 size_t alloc_size = 64; // Words
143 assert(is_size_aligned(alloc_size, Metachunk::object_alignment()), "assert");
144
145 MetaWord* mem = metachunk->allocate(alloc_size);
146
147 // Check post alloc
148 assert(mem == metachunk->initial_top(), "assert");
149 assert(mem + alloc_size == metachunk->top(), "assert");
150 assert(metachunk->used_word_size() == metachunk->overhead() + alloc_size, "assert");
151 assert(metachunk->free_word_size() == metachunk->word_size() - metachunk->used_word_size(), "assert");
152 assert(!metachunk->is_empty(), "assert");
153
154 // Clear chunk
155 metachunk->reset_empty();
156
157 // Check post clear
158 assert(metachunk->used_word_size() == metachunk->overhead(), "assert");
159 assert(metachunk->free_word_size() == metachunk->word_size() - metachunk->used_word_size(), "assert");
160 assert(metachunk->top() == metachunk->initial_top(), "assert");
161 assert(metachunk->is_empty(), "assert");
162
163 free(memory);
164 }
165 };
166
167 void TestMetachunk_test() {
168 TestMetachunk::test();
169 }
170
171 #endif
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1 /*
2 * Copyright (c) 2012, 2016, Oracle and/or its affiliates. All rights reserved.
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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
94 void Metachunk::mangle(juint word_value) {
95 // Overwrite the payload of the chunk and not the links that
96 // maintain list of chunks.
97 HeapWord* start = (HeapWord*)initial_top();
98 size_t size = word_size() - overhead();
99 Copy::fill_to_words(start, size, word_value);
100 }
101 #endif // PRODUCT
102
103 void Metachunk::verify() {
104 #ifdef ASSERT
105 // Cannot walk through the blocks unless the blocks have
106 // headers with sizes.
107 assert(bottom() <= _top &&
108 _top <= (MetaWord*)end(),
109 "Chunk has been smashed");
110 #endif
111 return;
112 }
113
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