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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.
+
+// contained_range_map-inl.h: Hierarchically-organized range map implementation.
+//
+// See contained_range_map.h for documentation.
+//
+// Author: Mark Mentovai
+
+#ifndef PROCESSOR_CONTAINED_RANGE_MAP_INL_H__
+#define PROCESSOR_CONTAINED_RANGE_MAP_INL_H__
+
+#include "processor/contained_range_map.h"
+
+#include <assert.h>
+
+#include "processor/logging.h"
+
+
+namespace google_breakpad {
+
+
+template<typename AddressType, typename EntryType>
+ContainedRangeMap<AddressType, EntryType>::~ContainedRangeMap() {
+  // Clear frees the children pointed to by the map, and frees the map itself.
+  Clear();
+}
+
+
+template<typename AddressType, typename EntryType>
+bool ContainedRangeMap<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) {
+    //TODO(nealsid) We are commenting this out in order to prevent
+    // excessive logging.  We plan to move to better logging as this
+    // failure happens quite often and is expected(see comment in
+    // basic_source_line_resolver.cc:671).
+    // BPLOG(INFO) << "StoreRange failed, " << HexString(base) << "+"
+    // << HexString(size) << ", " << HexString(high);
+    return false;
+  }
+
+  if (!map_)
+    map_ = new AddressToRangeMap();
+
+  MapIterator iterator_base = map_->lower_bound(base);
+  MapIterator iterator_high = map_->lower_bound(high);
+  MapIterator iterator_end = map_->end();
+
+  if (iterator_base == iterator_high && iterator_base != iterator_end &&
+      base >= iterator_base->second->base_) {
+    // The new range is entirely within an existing child range.
+
+    // If the new range's geometry is exactly equal to an existing child
+    // range's, it violates the containment rules, and an attempt to store
+    // it must fail.  iterator_base->first contains the key, which was the
+    // containing child's high address.
+    if (iterator_base->second->base_ == base && iterator_base->first == high) {
+      // TODO(nealsid): See the TODO above on why this is commented out.
+//       BPLOG(INFO) << "StoreRange failed, identical range is already "
+//                      "present: " << HexString(base) << "+" << HexString(size);
+      return false;
+    }
+
+    // Pass the new range on to the child to attempt to store.
+    return iterator_base->second->StoreRange(base, size, entry);
+  }
+
+  // iterator_high might refer to an irrelevant range: one whose base address
+  // is higher than the new range's high address.  Set contains_high to true
+  // only if iterator_high refers to a range that is at least partially
+  // within the new range.
+  bool contains_high = iterator_high != iterator_end &&
+                       high >= iterator_high->second->base_;
+
+  // If the new range encompasses any existing child ranges, it must do so
+  // fully.  Partial containment isn't allowed.
+  if ((iterator_base != iterator_end && base > iterator_base->second->base_) ||
+      (contains_high && high < iterator_high->first)) {
+    // TODO(mmentovai): Some symbol files will trip this check frequently
+    // on STACK lines.  Too many messages will be produced.  These are more
+    // suitable for a DEBUG channel than an INFO channel.
+    // BPLOG(INFO) << "StoreRange failed, new range partially contains "
+    //               "existing range: " << HexString(base) << "+" <<
+    //               HexString(size);
+    return false;
+  }
+
+  // When copying and erasing contained ranges, the "end" iterator needs to
+  // point one past the last item of the range to copy.  If contains_high is
+  // false, the iterator's already in the right place; the increment is safe
+  // because contains_high can't be true if iterator_high == iterator_end.
+  if (contains_high)
+    ++iterator_high;
+
+  // Optimization: if the iterators are equal, no child ranges would be
+  // moved.  Create the new child range with a NULL map to conserve space
+  // in leaf nodes, of which there will be many.
+  AddressToRangeMap *child_map = NULL;
+
+  if (iterator_base != iterator_high) {
+    // The children of this range that are contained by the new range must
+    // be transferred over to the new range.  Create the new child range map
+    // and copy the pointers to range maps it should contain into it.
+    child_map = new AddressToRangeMap(iterator_base, iterator_high);
+
+    // Remove the copied child pointers from this range's map of children.
+    map_->erase(iterator_base, iterator_high);
+  }
+
+  // Store the new range in the map by its high address.  Any children that
+  // the new child range contains were formerly children of this range but
+  // are now this range's grandchildren.  Ownership of these is transferred
+  // to the new child range.
+  map_->insert(MapValue(high,
+                        new ContainedRangeMap(base, entry, child_map)));
+  return true;
+}
+
+
+template<typename AddressType, typename EntryType>
+bool ContainedRangeMap<AddressType, EntryType>::RetrieveRange(
+    const AddressType &address, EntryType *entry) const {
+  BPLOG_IF(ERROR, !entry) << "ContainedRangeMap::RetrieveRange requires "
+                             "|entry|";
+  assert(entry);
+
+  // If nothing was ever stored, then there's nothing to retrieve.
+  if (!map_)
+    return false;
+
+  // Get an iterator to the child range whose high address is equal to or
+  // greater than the supplied address.  If the supplied address is higher
+  // than all of the high addresses in the range, then this range does not
+  // contain a child at address, so return false.  If the supplied address
+  // is lower than the base address of the child range, then it is not within
+  // the child range, so return false.
+  MapConstIterator iterator = map_->lower_bound(address);
+  if (iterator == map_->end() || address < iterator->second->base_)
+    return false;
+
+  // The child in iterator->second contains the specified address.  Find out
+  // if it has a more-specific descendant that also contains it.  If it does,
+  // it will set |entry| appropriately.  If not, set |entry| to the child.
+  if (!iterator->second->RetrieveRange(address, entry))
+    *entry = iterator->second->entry_;
+
+  return true;
+}
+
+
+template<typename AddressType, typename EntryType>
+void ContainedRangeMap<AddressType, EntryType>::Clear() {
+  if (map_) {
+    MapConstIterator end = map_->end();
+    for (MapConstIterator child = map_->begin(); child != end; ++child)
+      delete child->second;
+
+    delete map_;
+    map_ = NULL;
+  }
+}
+
+
+}  // namespace google_breakpad
+
+
+#endif  // PROCESSOR_CONTAINED_RANGE_MAP_INL_H__