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-// Copyright (c) 2006, Google Inc.
-// All rights reserved.
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-// * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-// * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-// * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// 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_breakpad {
-
-// Forward declarations (for later friend declarations of specialized template).
-template<class, class> class RangeMapSerializer;
-
-template<typename AddressType, typename EntryType>
-class RangeMap {
- public:
- RangeMap() : enable_shrink_down_(false), map_() {}
-
- // |enable_shrink_down| tells whether overlapping ranges can be shrunk down.
- // If true, then adding a new range that overlaps with an existing one can
- // be a successful operation. The range which ends at the higher address
- // will be shrunk down by moving its start position to a higher address so
- // that it does not overlap anymore.
- void SetEnableShrinkDown(bool enable_shrink_down);
- bool IsShrinkDownEnabled() const;
-
- // 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. If enable_shrink_down is true and there is an overlap
- // between the current range and some other range (already in the map),
- // shrink down the range which ends at a higher address.
- bool StoreRange(const AddressType &base, const AddressType &size,
- const EntryType &entry);
-
- // Locates the range encompassing the supplied address. If there is no such
- // range, returns false. entry_base, entry_delta, and entry_size, if
- // non-NULL, are set to the base, delta, and size of the entry's range.
- // A positive entry delta (> 0) indicates that there was an overlap and the
- // entry was shrunk down (original start address was increased by delta).
- bool RetrieveRange(const AddressType &address, EntryType *entry,
- AddressType *entry_base, AddressType *entry_delta,
- AddressType *entry_size) const;
-
- // Locates the range encompassing the supplied address, if one exists.
- // If no range encompasses the supplied address, locates the nearest range
- // to the supplied address that is lower than the address. Returns false
- // if no range meets these criteria. entry_base, entry_delta, and entry_size,
- // if non-NULL, are set to the base, delta, and size of the entry's range.
- // A positive entry delta (> 0) indicates that there was an overlap and the
- // entry was shrunk down (original start address was increased by delta).
- bool RetrieveNearestRange(const AddressType &address, EntryType *entry,
- AddressType *entry_base, AddressType *entry_delta,
- AddressType *entry_size) const;
-
- // Treating all ranges as a list ordered by the address spaces that they
- // occupy, locates the range at the index specified by index. Returns
- // false if index is larger than the number of ranges stored. entry_base,
- // entry_delta, and entry_size, if non-NULL, are set to the base, delta, and
- // size of the entry's range.
- // A positive entry delta (> 0) indicates that there was an overlap and the
- // entry was shrunk down (original start address was increased by delta).
- //
- // RetrieveRangeAtIndex is not optimized for speedy operation.
- bool RetrieveRangeAtIndex(int index, EntryType *entry,
- AddressType *entry_base, AddressType *entry_delta,
- AddressType *entry_size) const;
-
- // Returns the number of ranges stored in the RangeMap.
- int GetCount() const;
-
- // Empties the range map, restoring it to the state it was when it was
- // initially created.
- void Clear();
-
- private:
- // Friend declarations.
- friend class ModuleComparer;
- friend class RangeMapSerializer<AddressType, EntryType>;
-
- // Same a StoreRange() with the only exception that the |delta| can be
- // passed in.
- bool StoreRangeInternal(const AddressType &base, const AddressType &delta,
- const AddressType &size, const EntryType &entry);
-
- class Range {
- public:
- Range(const AddressType &base, const AddressType &delta,
- const EntryType &entry)
- : base_(base), delta_(delta), entry_(entry) {}
-
- AddressType base() const { return base_; }
- AddressType delta() const { return delta_; }
- 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 delta when the range is shrunk down.
- const AddressType delta_;
-
- // 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;
-
- // Whether overlapping ranges can be shrunk down.
- bool enable_shrink_down_;
-
- // Maps the high address of each range to a EntryType.
- AddressToRangeMap map_;
-};
-
-
-} // namespace google_breakpad
-
-
-#endif // PROCESSOR_RANGE_MAP_H__