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// Copyright (C) 2006 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// range_map.h: Range maps.
//
// A range map associates a range of addresses with a specific object. This
// is useful when certain objects of variable size are located within an
// address space. The range map makes it simple to determine which object is
// associated with a specific address, which may be any address within the
// range associated with an object.
//
// Author: Mark Mentovai
#ifndef PROCESSOR_RANGE_MAP_H__
#define PROCESSOR_RANGE_MAP_H__
#include <map>
namespace google_airbag {
template<typename AddressType, typename EntryType>
class RangeMap {
public:
RangeMap() : map_() {}
// Inserts a range into the map. Returns false for a parameter error,
// or if the location of the range would conflict with a range already
// stored in the map.
bool StoreRange(const AddressType &base,
const AddressType &size,
const EntryType &entry);
// Locates the range encompassing the supplied address. If there is
// no such range, or if there is a parameter error, returns false.
bool RetrieveRange(const AddressType &address, EntryType *entry) const;
// Empties the range map, restoring it to the state it was when it was
// initially created.
void Clear();
private:
class Range {
public:
Range(const AddressType &base, const EntryType &entry)
: base_(base), entry_(entry) {}
AddressType base() const { return base_; }
EntryType entry() const { return entry_; }
private:
// The base address of the range. The high address does not need to
// be stored, because RangeMap uses it as the key to the map.
const AddressType base_;
// The entry corresponding to a range.
const EntryType entry_;
};
// Convenience types.
typedef std::map<AddressType, Range> AddressToRangeMap;
typedef typename AddressToRangeMap::const_iterator MapConstIterator;
typedef typename AddressToRangeMap::value_type MapValue;
// Maps the high address of each range to a EntryType.
AddressToRangeMap map_;
};
} // namespace google_airbag
#endif // PROCESSOR_RANGE_MAP_H__
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