address_map.h

// Copyright (c) 2006, Google Inc.
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// address_map.h: Address maps.
//
// An address map contains a set of objects keyed by address.  Objects are
// retrieved from the map by returning the object with the highest key less
// than or equal to the lookup key.
//
// Author: Mark Mentovai

#ifndef PROCESSOR_ADDRESS_MAP_H__
#define PROCESSOR_ADDRESS_MAP_H__

#include <map>

namespace google_breakpad {

// Forward declarations (for later friend declarations).
template<class, class> class AddressMapSerializer;

template<typename AddressType, typename EntryType>
class AddressMap {
 public:
  AddressMap() : map_() {}

  // Inserts an entry into the map.  Returns false without storing the entry
  // if an entry is already stored in the map at the same address as specified
  // by the address argument.
  bool Store(const AddressType &address, const EntryType &entry);

  // Locates the entry stored at the highest address less than or equal to
  // the address argument.  If there is no such range, returns false.  The
  // entry is returned in entry, which is a required argument.  If
  // entry_address is not NULL, it will be set to the address that the entry
  // was stored at.
  bool Retrieve(const AddressType &address,
                EntryType *entry, AddressType *entry_address) const;

  // Empties the address map, restoring it to the same state as when it was
  // initially created.
  void Clear();

 private:
  friend class AddressMapSerializer<AddressType, EntryType>;
  friend class ModuleComparer;

  // Convenience types.
  typedef std::map<AddressType, EntryType> AddressToEntryMap;
  typedef typename AddressToEntryMap::const_iterator MapConstIterator;
  typedef typename AddressToEntryMap::value_type MapValue;

  // Maps the address of each entry to an EntryType.
  AddressToEntryMap map_;
};

}  // namespace google_breakpad

#endif  // PROCESSOR_ADDRESS_MAP_H__