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// Copyright (c) 2010, 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.
// static_contained_range_map.h: StaticContainedRangeMap.
//
// StaticContainedRangeMap is similar to ContainedRangeMap. However,
// StaticContainedRangeMap wraps a StaticMap instead of std::map, and does not
// support dynamic operations like StoreRange(...).
// StaticContainedRangeMap provides same RetrieveRange(...) interfaces as
// ContainedRangeMap.
//
// Please see contained_range_map.h for more documentation.
//
// Author: Siyang Xie (lambxsy@google.com)
#ifndef PROCESSOR_STATIC_CONTAINED_RANGE_MAP_H__
#define PROCESSOR_STATIC_CONTAINED_RANGE_MAP_H__
#include "processor/static_map-inl.h"
namespace google_breakpad {
template<typename AddressType, typename EntryType>
class StaticContainedRangeMap {
public:
StaticContainedRangeMap(): base_(), entry_size_(), entry_ptr_(), map_() { }
explicit StaticContainedRangeMap(const char *base);
// Retrieves the most specific (smallest) descendant range encompassing
// the specified address. This method will only return entries held by
// child ranges, and not the entry contained by |this|. This is necessary
// to support a sparsely-populated root range. If no descendant range
// encompasses the address, returns false.
bool RetrieveRange(const AddressType& address, const EntryType*& entry) const;
private:
friend class ModuleComparer;
// AddressToRangeMap stores pointers. This makes reparenting simpler in
// StoreRange, because it doesn't need to copy entire objects.
typedef StaticContainedRangeMap* SelfPtr;
typedef
StaticMap<AddressType, StaticContainedRangeMap> AddressToRangeMap;
typedef typename AddressToRangeMap::const_iterator MapConstIterator;
// The base address of this range. The high address does not need to
// be stored, because it is used as the key to an object in its parent's
// map, and all ContainedRangeMaps except for the root range are contained
// within maps. The root range does not actually contain an entry, so its
// base_ field is meaningless, and the fact that it has no parent and thus
// no key is unimportant. For this reason, the base_ field should only be
// is accessed on child ContainedRangeMap objects, and never on |this|.
AddressType base_;
// The entry corresponding to this range. The root range does not
// actually contain an entry, so its entry_ field is meaningless. For
// this reason, the entry_ field should only be accessed on child
// ContainedRangeMap objects, and never on |this|.
uint32_t entry_size_;
const EntryType *entry_ptr_;
// The map containing child ranges, keyed by each child range's high
// address. This is a pointer to avoid allocating map structures for
// leaf nodes, where they are not needed.
AddressToRangeMap map_;
};
} // namespace google_breakpad
#endif // PROCESSOR_STATIC_CONTAINED_RANGE_MAP_H__
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