tschatzl@7051: /*
azakharov@7835:  * Copyright (c) 2014, 2015, Oracle and/or its affiliates. All rights reserved.
tschatzl@7051:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
tschatzl@7051:  *
tschatzl@7051:  * This code is free software; you can redistribute it and/or modify it
tschatzl@7051:  * under the terms of the GNU General Public License version 2 only, as
tschatzl@7051:  * published by the Free Software Foundation.
tschatzl@7051:  *
tschatzl@7051:  * This code is distributed in the hope that it will be useful, but WITHOUT
tschatzl@7051:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
tschatzl@7051:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
tschatzl@7051:  * version 2 for more details (a copy is included in the LICENSE file that
tschatzl@7051:  * accompanied this code).
tschatzl@7051:  *
tschatzl@7051:  * You should have received a copy of the GNU General Public License version
tschatzl@7051:  * 2 along with this work; if not, write to the Free Software Foundation,
tschatzl@7051:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
tschatzl@7051:  *
tschatzl@7051:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
tschatzl@7051:  * or visit www.oracle.com if you need additional information or have any
tschatzl@7051:  * questions.
tschatzl@7051:  *
tschatzl@7051:  */
tschatzl@7051: 
tschatzl@7051: #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1REGIONTOSPACEMAPPER_HPP
tschatzl@7051: #define SHARE_VM_GC_IMPLEMENTATION_G1_G1REGIONTOSPACEMAPPER_HPP
tschatzl@7051: 
tschatzl@7051: #include "gc_implementation/g1/g1PageBasedVirtualSpace.hpp"
tschatzl@7053: #include "memory/allocation.hpp"
tschatzl@7051: #include "utilities/debug.hpp"
tschatzl@7051: 
tschatzl@7051: class G1MappingChangedListener VALUE_OBJ_CLASS_SPEC {
tschatzl@7051:  public:
tschatzl@7051:   // Fired after commit of the memory, i.e. the memory this listener is registered
tschatzl@7051:   // for can be accessed.
tschatzl@7257:   // Zero_filled indicates that the memory can be considered as filled with zero bytes
tschatzl@7257:   // when called.
tschatzl@7257:   virtual void on_commit(uint start_idx, size_t num_regions, bool zero_filled) = 0;
tschatzl@7051: };
tschatzl@7051: 
tschatzl@7051: // Maps region based commit/uncommit requests to the underlying page sized virtual
tschatzl@7051: // space.
tschatzl@7051: class G1RegionToSpaceMapper : public CHeapObj<mtGC> {
tschatzl@7051:  private:
tschatzl@7051:   G1MappingChangedListener* _listener;
tschatzl@7051:  protected:
tschatzl@7051:   // Backing storage.
tschatzl@7051:   G1PageBasedVirtualSpace _storage;
tschatzl@7781: 
tschatzl@7051:   size_t _region_granularity;
tschatzl@7051:   // Mapping management
tschatzl@7051:   BitMap _commit_map;
tschatzl@7051: 
tschatzl@7781:   G1RegionToSpaceMapper(ReservedSpace rs, size_t used_size, size_t page_size, size_t region_granularity, MemoryType type);
tschatzl@7051: 
tschatzl@7257:   void fire_on_commit(uint start_idx, size_t num_regions, bool zero_filled);
tschatzl@7051:  public:
tschatzl@7051:   MemRegion reserved() { return _storage.reserved(); }
tschatzl@7051: 
azakharov@7835:   size_t reserved_size() { return _storage.reserved_size(); }
azakharov@7835:   size_t committed_size() { return _storage.committed_size(); }
azakharov@7835: 
tschatzl@7051:   void set_mapping_changed_listener(G1MappingChangedListener* listener) { _listener = listener; }
tschatzl@7051: 
tschatzl@7051:   virtual ~G1RegionToSpaceMapper() {
tschatzl@7051:     _commit_map.resize(0, /* in_resource_area */ false);
tschatzl@7051:   }
tschatzl@7051: 
tschatzl@7051:   bool is_committed(uintptr_t idx) const {
tschatzl@7051:     return _commit_map.at(idx);
tschatzl@7051:   }
tschatzl@7051: 
tschatzl@7781:   virtual void commit_regions(uint start_idx, size_t num_regions = 1) = 0;
tschatzl@7781:   virtual void uncommit_regions(uint start_idx, size_t num_regions = 1) = 0;
tschatzl@7051: 
tschatzl@7051:   // Creates an appropriate G1RegionToSpaceMapper for the given parameters.
tschatzl@7781:   // The actual space to be used within the given reservation is given by actual_size.
tschatzl@7781:   // This is because some OSes need to round up the reservation size to guarantee
tschatzl@7781:   // alignment of page_size.
tschatzl@7051:   // The byte_translation_factor defines how many bytes in a region correspond to
tschatzl@7051:   // a single byte in the data structure this mapper is for.
tschatzl@7051:   // Eg. in the card table, this value corresponds to the size a single card
tschatzl@7781:   // table entry corresponds to in the heap.
tschatzl@7051:   static G1RegionToSpaceMapper* create_mapper(ReservedSpace rs,
tschatzl@7781:                                               size_t actual_size,
tschatzl@7781:                                               size_t page_size,
tschatzl@7051:                                               size_t region_granularity,
tschatzl@7051:                                               size_t byte_translation_factor,
tschatzl@7051:                                               MemoryType type);
tschatzl@7051: };
tschatzl@7051: 
tschatzl@7051: #endif /* SHARE_VM_GC_IMPLEMENTATION_G1_G1REGIONTOSPACEMAPPER_HPP */