Mercurial > hg > graal-compiler
comparison src/share/vm/memory/metablock.cpp @ 7208:eade6b2e4782
8003554: NPG: move Metablock and Metachunk code out of metaspace.cpp
Reviewed-by: coleenp
author | jmasa |
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date | Thu, 29 Nov 2012 10:09:04 -0800 |
parents | |
children | 3efdfd6ddbf2 |
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7207:0f80645e9c26 | 7208:eade6b2e4782 |
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1 /* | |
2 * Copyright (c) 2012, 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 * | |
23 */ | |
24 | |
25 #include "precompiled.hpp" | |
26 #include "memory/allocation.hpp" | |
27 #include "memory/metablock.hpp" | |
28 #include "utilities/copy.hpp" | |
29 #include "utilities/debug.hpp" | |
30 | |
31 // Blocks of space for metadata are allocated out of Metachunks. | |
32 // | |
33 // Metachunk are allocated out of MetadataVirtualspaces and once | |
34 // allocated there is no explicit link between a Metachunk and | |
35 // the MetadataVirtualspaces from which it was allocated. | |
36 // | |
37 // Each SpaceManager maintains a | |
38 // list of the chunks it is using and the current chunk. The current | |
39 // chunk is the chunk from which allocations are done. Space freed in | |
40 // a chunk is placed on the free list of blocks (BlockFreelist) and | |
41 // reused from there. | |
42 // | |
43 // Future modification | |
44 // | |
45 // The Metachunk can conceivable be replaced by the Chunk in | |
46 // allocation.hpp. Note that the latter Chunk is the space for | |
47 // allocation (allocations from the chunk are out of the space in | |
48 // the Chunk after the header for the Chunk) where as Metachunks | |
49 // point to space in a VirtualSpace. To replace Metachunks with | |
50 // Chunks, change Chunks so that they can be allocated out of a VirtualSpace. | |
51 size_t Metablock::_min_block_byte_size = sizeof(Metablock); | |
52 | |
53 #ifdef ASSERT | |
54 size_t Metablock::_overhead = | |
55 Chunk::aligned_overhead_size(sizeof(Metablock)) / BytesPerWord; | |
56 #else | |
57 size_t Metablock::_overhead = 0; | |
58 #endif | |
59 | |
60 // New blocks returned by the Metaspace are zero initialized. | |
61 // We should fix the constructors to not assume this instead. | |
62 Metablock* Metablock::initialize(MetaWord* p, size_t word_size) { | |
63 if (p == NULL) { | |
64 return NULL; | |
65 } | |
66 | |
67 Metablock* result = (Metablock*) p; | |
68 | |
69 // Clear the memory | |
70 Copy::fill_to_aligned_words((HeapWord*)result, word_size); | |
71 #ifdef ASSERT | |
72 result->set_word_size(word_size); | |
73 #endif | |
74 return result; | |
75 } |