1 /* 2 * Copyright (c) 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 * 23 */ 24 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1REGIONTOSPACEMAPPER_HPP 26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1REGIONTOSPACEMAPPER_HPP 27 28 #include "gc_implementation/g1/g1PageBasedVirtualSpace.hpp" 29 #include "utilities/debug.hpp" 30 31 class G1MappingChangedListener VALUE_OBJ_CLASS_SPEC { 32 public: 33 virtual void on_commit(uint start_idx, size_t num_regions) = 0; 34 }; 35 36 // Maps region based commit/uncommit requests to the underlying page sized virtual 37 // space. 38 class G1RegionToSpaceMapper : public CHeapObj<mtGC>{ 39 private: 40 G1MappingChangedListener* _listener; 41 protected: 42 // Backing storage. 43 G1PageBasedVirtualSpace _storage; 44 size_t _commit_granularity; 45 size_t _region_granularity; 46 // Mapping management 47 BitMap _commit_map; 48 49 G1RegionToSpaceMapper(ReservedSpace rs, size_t commit_granularity, size_t region_granularity, MemoryType type); 50 51 void fire_on_commit(uint start_idx, size_t num_regions); 52 public: 53 MemRegion reserved() { return _storage.reserved(); } 54 55 void set_mapping_changed_listener(G1MappingChangedListener* listener) { _listener = listener; } 56 57 virtual ~G1RegionToSpaceMapper() { 58 _commit_map.resize(0, /* in_resource_area */ false); 59 } 60 61 bool is_committed(uintptr_t idx) const { 62 return _commit_map.at(idx); 63 } 64 65 virtual void commit_regions(uintptr_t start_idx, size_t num_regions = 1) = 0; 66 virtual void uncommit_regions(uintptr_t start_idx, size_t num_regions = 1) = 0; 67 68 static G1RegionToSpaceMapper* create_mapper(ReservedSpace rs, 69 size_t os_commit_granularity, 70 size_t region_granularity, 71 size_t byte_translation_factor, 72 MemoryType type); 73 }; 74 75 #endif /* SHARE_VM_GC_IMPLEMENTATION_G1_G1REGIONTOSPACEMAPPER_HPP */