Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CodeCacheRemSet.hpp @ 20645:2f445c5048df
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author | coleenp |
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date | Mon, 17 Nov 2014 19:35:09 +0000 |
parents | 7baf47cb97cb |
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1 /* |
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2 * Copyright (c) 2014, 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 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1CODECACHEREMSET_HPP |
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26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1CODECACHEREMSET_HPP |
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27 |
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28 #include "memory/allocation.hpp" |
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29 |
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30 class CodeBlobClosure; |
20494 | 31 class CodeRootSetTable; |
32 class HeapRegion; | |
33 class nmethod; | |
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34 |
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35 // Implements storage for a set of code roots. |
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36 // All methods that modify the set are not thread-safe except if otherwise noted. |
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37 class G1CodeRootSet VALUE_OBJ_CLASS_SPEC { |
20494 | 38 friend class G1CodeRootSetTest; |
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39 private: |
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40 |
20494 | 41 const static size_t SmallSize = 32; |
42 const static size_t Threshold = 24; | |
43 const static size_t LargeSize = 512; | |
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44 |
20494 | 45 CodeRootSetTable* _table; |
46 CodeRootSetTable* load_acquire_table(); | |
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47 |
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48 size_t _length; |
20494 | 49 |
50 void move_to_large(); | |
51 void allocate_small_table(); | |
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52 |
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53 public: |
20494 | 54 G1CodeRootSet() : _table(NULL), _length(0) {} |
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55 ~G1CodeRootSet(); |
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56 |
20494 | 57 static void purge(); |
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58 |
20494 | 59 static size_t static_mem_size(); |
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60 |
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61 void add(nmethod* method); |
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62 |
20494 | 63 bool remove(nmethod* method); |
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64 |
20494 | 65 // Safe to call without synchronization, but may return false negatives. |
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66 bool contains(nmethod* method); |
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67 |
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68 void clear(); |
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69 |
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70 void nmethods_do(CodeBlobClosure* blk) const; |
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71 |
20494 | 72 // Remove all nmethods which no longer contain pointers into our "owner" region |
73 void clean(HeapRegion* owner); | |
74 | |
75 bool is_empty() { | |
76 bool empty = length() == 0; | |
77 assert(empty == (_table == NULL), "is empty only if table is deallocated"); | |
78 return empty; | |
79 } | |
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80 |
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81 // Length in elements |
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82 size_t length() const { return _length; } |
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83 |
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84 // Memory size in bytes taken by this set. |
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85 size_t mem_size(); |
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86 |
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87 }; |
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88 |
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89 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1CODECACHEREMSET_HPP |