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20337
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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_G1REGIONTOSPACEMAPPER_HPP
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26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1REGIONTOSPACEMAPPER_HPP
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27
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28 #include "gc_implementation/g1/g1PageBasedVirtualSpace.hpp"
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29 #include "utilities/debug.hpp"
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30
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31 class G1MappingChangedListener VALUE_OBJ_CLASS_SPEC {
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32 public:
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33 // Fired after commit of the memory, i.e. the memory this listener is registered
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34 // for can be accessed.
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35 virtual void on_commit(uint start_idx, size_t num_regions) = 0;
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36 };
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37
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38 // Maps region based commit/uncommit requests to the underlying page sized virtual
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39 // space.
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40 class G1RegionToSpaceMapper : public CHeapObj<mtGC> {
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41 private:
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42 G1MappingChangedListener* _listener;
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43 protected:
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44 // Backing storage.
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45 G1PageBasedVirtualSpace _storage;
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46 size_t _commit_granularity;
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47 size_t _region_granularity;
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48 // Mapping management
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49 BitMap _commit_map;
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50
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51 G1RegionToSpaceMapper(ReservedSpace rs, size_t commit_granularity, size_t region_granularity, MemoryType type);
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52
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53 void fire_on_commit(uint start_idx, size_t num_regions);
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54 public:
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55 MemRegion reserved() { return _storage.reserved(); }
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56
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57 void set_mapping_changed_listener(G1MappingChangedListener* listener) { _listener = listener; }
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58
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59 virtual ~G1RegionToSpaceMapper() {
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60 _commit_map.resize(0, /* in_resource_area */ false);
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61 }
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62
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63 bool is_committed(uintptr_t idx) const {
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64 return _commit_map.at(idx);
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65 }
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66
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67 virtual void commit_regions(uintptr_t start_idx, size_t num_regions = 1) = 0;
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68 virtual void uncommit_regions(uintptr_t start_idx, size_t num_regions = 1) = 0;
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69
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70 // Creates an appropriate G1RegionToSpaceMapper for the given parameters.
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71 // The byte_translation_factor defines how many bytes in a region correspond to
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72 // a single byte in the data structure this mapper is for.
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73 // Eg. in the card table, this value corresponds to the size a single card
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74 // table entry corresponds to.
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75 static G1RegionToSpaceMapper* create_mapper(ReservedSpace rs,
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76 size_t os_commit_granularity,
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77 size_t region_granularity,
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78 size_t byte_translation_factor,
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79 MemoryType type);
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80 };
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81
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82 #endif /* SHARE_VM_GC_IMPLEMENTATION_G1_G1REGIONTOSPACEMAPPER_HPP */
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