Mercurial > hg > truffle
annotate src/share/vm/memory/metablock.cpp @ 9020:627dc359e918
Use correct method to access constant pool
author | Christian Wimmer <christian.wimmer@oracle.com> |
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date | Thu, 11 Apr 2013 15:39:55 -0700 |
parents | 5939f5953b45 |
children | 335b388c4b28 |
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1 /* |
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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/metablock.hpp" |
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28 #include "utilities/copy.hpp" |
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29 #include "utilities/debug.hpp" |
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30 |
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31 // Blocks of space for metadata are allocated out of Metachunks. |
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32 // |
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33 // Metachunk are allocated out of MetadataVirtualspaces and once |
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34 // allocated there is no explicit link between a Metachunk and |
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35 // the MetadataVirtualspaces from which it was allocated. |
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36 // |
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37 // Each SpaceManager maintains a |
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38 // list of the chunks it is using and the current chunk. The current |
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39 // chunk is the chunk from which allocations are done. Space freed in |
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40 // a chunk is placed on the free list of blocks (BlockFreelist) and |
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41 // reused from there. |
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42 // |
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43 // Future modification |
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44 // |
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45 // The Metachunk can conceivable be replaced by the Chunk in |
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46 // allocation.hpp. Note that the latter Chunk is the space for |
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47 // allocation (allocations from the chunk are out of the space in |
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48 // the Chunk after the header for the Chunk) where as Metachunks |
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49 // point to space in a VirtualSpace. To replace Metachunks with |
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50 // Chunks, change Chunks so that they can be allocated out of a VirtualSpace. |
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51 size_t Metablock::_min_block_byte_size = sizeof(Metablock); |
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52 |
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53 #ifdef ASSERT |
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54 size_t Metablock::_overhead = |
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55 Chunk::aligned_overhead_size(sizeof(Metablock)) / BytesPerWord; |
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56 #else |
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57 size_t Metablock::_overhead = 0; |
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58 #endif |
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59 |
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60 // New blocks returned by the Metaspace are zero initialized. |
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61 // We should fix the constructors to not assume this instead. |
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62 Metablock* Metablock::initialize(MetaWord* p, size_t word_size) { |
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63 if (p == NULL) { |
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64 return NULL; |
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65 } |
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66 |
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67 Metablock* result = (Metablock*) p; |
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68 |
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69 // Clear the memory |
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70 Copy::fill_to_aligned_words((HeapWord*)result, word_size); |
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71 #ifdef ASSERT |
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72 result->set_word_size(word_size); |
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73 #endif |
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74 return result; |
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75 } |