1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/gc_implementation/g1/g1RegionToSpaceMapper.hpp Thu Aug 21 11:47:10 2014 +0200
1.3 @@ -0,0 +1,82 @@
1.4 +/*
1.5 + * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1REGIONTOSPACEMAPPER_HPP
1.29 +#define SHARE_VM_GC_IMPLEMENTATION_G1_G1REGIONTOSPACEMAPPER_HPP
1.30 +
1.31 +#include "gc_implementation/g1/g1PageBasedVirtualSpace.hpp"
1.32 +#include "utilities/debug.hpp"
1.33 +
1.34 +class G1MappingChangedListener VALUE_OBJ_CLASS_SPEC {
1.35 + public:
1.36 + // Fired after commit of the memory, i.e. the memory this listener is registered
1.37 + // for can be accessed.
1.38 + virtual void on_commit(uint start_idx, size_t num_regions) = 0;
1.39 +};
1.40 +
1.41 +// Maps region based commit/uncommit requests to the underlying page sized virtual
1.42 +// space.
1.43 +class G1RegionToSpaceMapper : public CHeapObj<mtGC> {
1.44 + private:
1.45 + G1MappingChangedListener* _listener;
1.46 + protected:
1.47 + // Backing storage.
1.48 + G1PageBasedVirtualSpace _storage;
1.49 + size_t _commit_granularity;
1.50 + size_t _region_granularity;
1.51 + // Mapping management
1.52 + BitMap _commit_map;
1.53 +
1.54 + G1RegionToSpaceMapper(ReservedSpace rs, size_t commit_granularity, size_t region_granularity, MemoryType type);
1.55 +
1.56 + void fire_on_commit(uint start_idx, size_t num_regions);
1.57 + public:
1.58 + MemRegion reserved() { return _storage.reserved(); }
1.59 +
1.60 + void set_mapping_changed_listener(G1MappingChangedListener* listener) { _listener = listener; }
1.61 +
1.62 + virtual ~G1RegionToSpaceMapper() {
1.63 + _commit_map.resize(0, /* in_resource_area */ false);
1.64 + }
1.65 +
1.66 + bool is_committed(uintptr_t idx) const {
1.67 + return _commit_map.at(idx);
1.68 + }
1.69 +
1.70 + virtual void commit_regions(uintptr_t start_idx, size_t num_regions = 1) = 0;
1.71 + virtual void uncommit_regions(uintptr_t start_idx, size_t num_regions = 1) = 0;
1.72 +
1.73 + // Creates an appropriate G1RegionToSpaceMapper for the given parameters.
1.74 + // The byte_translation_factor defines how many bytes in a region correspond to
1.75 + // a single byte in the data structure this mapper is for.
1.76 + // Eg. in the card table, this value corresponds to the size a single card
1.77 + // table entry corresponds to.
1.78 + static G1RegionToSpaceMapper* create_mapper(ReservedSpace rs,
1.79 + size_t os_commit_granularity,
1.80 + size_t region_granularity,
1.81 + size_t byte_translation_factor,
1.82 + MemoryType type);
1.83 +};
1.84 +
1.85 +#endif /* SHARE_VM_GC_IMPLEMENTATION_G1_G1REGIONTOSPACEMAPPER_HPP */
