Mercurial > hg > graal-jvmci-8
view src/share/vm/gc_implementation/g1/g1RegionToSpaceMapper.hpp @ 23287:bd88fd590f4e
Restore G1 changes from e13c65f874e5 after merge
author | Gilles Duboscq <gilles.m.duboscq@oracle.com> |
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date | Fri, 08 Jan 2016 15:46:55 +0100 |
parents | e5406a79ae90 |
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/* * Copyright (c) 2014, 2015, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1REGIONTOSPACEMAPPER_HPP #define SHARE_VM_GC_IMPLEMENTATION_G1_G1REGIONTOSPACEMAPPER_HPP #include "gc_implementation/g1/g1PageBasedVirtualSpace.hpp" #include "memory/allocation.hpp" #include "utilities/debug.hpp" class G1MappingChangedListener VALUE_OBJ_CLASS_SPEC { public: // Fired after commit of the memory, i.e. the memory this listener is registered // for can be accessed. // Zero_filled indicates that the memory can be considered as filled with zero bytes // when called. virtual void on_commit(uint start_idx, size_t num_regions, bool zero_filled) = 0; }; // Maps region based commit/uncommit requests to the underlying page sized virtual // space. class G1RegionToSpaceMapper : public CHeapObj<mtGC> { private: G1MappingChangedListener* _listener; protected: // Backing storage. G1PageBasedVirtualSpace _storage; size_t _region_granularity; // Mapping management BitMap _commit_map; G1RegionToSpaceMapper(ReservedSpace rs, size_t used_size, size_t page_size, size_t region_granularity, MemoryType type); void fire_on_commit(uint start_idx, size_t num_regions, bool zero_filled); public: MemRegion reserved() { return _storage.reserved(); } size_t reserved_size() { return _storage.reserved_size(); } size_t committed_size() { return _storage.committed_size(); } void set_mapping_changed_listener(G1MappingChangedListener* listener) { _listener = listener; } virtual ~G1RegionToSpaceMapper() { _commit_map.resize(0, /* in_resource_area */ false); } bool is_committed(uintptr_t idx) const { return _commit_map.at(idx); } virtual void commit_regions(uint start_idx, size_t num_regions = 1) = 0; virtual void uncommit_regions(uint start_idx, size_t num_regions = 1) = 0; // Creates an appropriate G1RegionToSpaceMapper for the given parameters. // The actual space to be used within the given reservation is given by actual_size. // This is because some OSes need to round up the reservation size to guarantee // alignment of page_size. // The byte_translation_factor defines how many bytes in a region correspond to // a single byte in the data structure this mapper is for. // Eg. in the card table, this value corresponds to the size a single card // table entry corresponds to in the heap. static G1RegionToSpaceMapper* create_mapper(ReservedSpace rs, size_t actual_size, size_t page_size, size_t region_granularity, size_t byte_translation_factor, MemoryType type); }; #endif /* SHARE_VM_GC_IMPLEMENTATION_G1_G1REGIONTOSPACEMAPPER_HPP */