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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;
+
+// Determines what happens when two ranges overlap.
+enum class MergeRangeStrategy {
+  // When two ranges overlap, the new range fails to be inserted. The default
+  // strategy.
+  kExclusiveRanges,
+
+  // The range with the lower base address will be truncated such that it's
+  // high address is one less than the range above it.
+  kTruncateLower,
+
+  // The range with the greater high address has its range truncated such that
+  // its base address is one higher than the range below it.
+  kTruncateUpper
+};
+
+template<typename AddressType, typename EntryType>
+class RangeMap {
+ public:
+  RangeMap() : merge_strategy_(MergeRangeStrategy::kExclusiveRanges), map_() {}
+
+  void SetMergeStrategy(MergeRangeStrategy strat) { merge_strategy_ = strat; }
+
+  MergeRangeStrategy GetMergeStrategy() const { return merge_strategy_; }
+
+  // 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;
+
+  MergeRangeStrategy merge_strategy_;
+
+  // Maps the high address of each range to a EntryType.
+  AddressToRangeMap map_;
+};
+
+
+}  // namespace google_breakpad
+
+
+#endif  // PROCESSOR_RANGE_MAP_H__