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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-inl.h: Range map implementation.
//
// See range_map.h for documentation.
//
// Author: Mark Mentovai
#ifndef PROCESSOR_RANGE_MAP_INL_H__
#define PROCESSOR_RANGE_MAP_INL_H__
#include "processor/range_map.h"
namespace google_airbag {
template<typename AddressType, typename EntryType>
bool RangeMap<AddressType, EntryType>::StoreRange(const AddressType &base,
const AddressType &size,
const EntryType &entry) {
AddressType high = base + size - 1;
// Check for undersize or overflow.
if (size <= 0 || high < base)
return false;
// Ensure that this range does not overlap with another one already in the
// map.
MapConstIterator iterator_base = map_.lower_bound(base);
MapConstIterator iterator_high = map_.lower_bound(high);
if (iterator_base != iterator_high) {
// Some other range begins in the space used by this range. It may be
// contained within the space used by this range, or it may extend lower.
// Regardless, it is an error.
return false;
}
if (iterator_high != map_.end()) {
if (iterator_high->second.base() <= high) {
// The range above this one overlaps with this one. It may fully
// contain this range, or it may begin within this range and extend
// higher. Regardless, it's an error.
return false;
}
}
// Store the range in the map by its high address, so that lower_bound can
// be used to quickly locate a range by address.
map_.insert(MapValue(high, Range(base, entry)));
return true;
}
template<typename AddressType, typename EntryType>
bool RangeMap<AddressType, EntryType>::RetrieveRange(
const AddressType &address, EntryType *entry) const {
if (!entry)
return false;
MapConstIterator iterator = map_.lower_bound(address);
if (iterator == map_.end())
return false;
// The map is keyed by the high address of each range, so |address| is
// guaranteed to be lower than the range's high address. If |range| is
// not directly preceded by another range, it's possible for address to
// be below the range's low address, though. When that happens, address
// references something not within any range, so return false.
if (address < iterator->second.base())
return false;
*entry = iterator->second.entry();
return true;
}
template<typename AddressType, typename EntryType>
void RangeMap<AddressType, EntryType>::Clear() {
map_.clear();
}
} // namespace google_airbag
#endif // PROCESSOR_RANGE_MAP_INL_H__
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