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+// Copyright 2010 Google LLC
+//
+// 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 LLC 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.
+//
+// module_comparer.h: ModuleComparer reads a string format of symbol file, and
+// loads the symbol into both BasicSourceLineResolver::Module and
+// FastSourceLineResolve::Module.  It then traverses both Modules and compare
+// the content of data to verify the correctness of new fast module.
+// ModuleCompare class is a tool to verify correctness of a loaded
+// FastSourceLineResolver::Module instance, i.e., in-memory representation of
+// parsed symbol.  ModuleComparer class should be used for testing purpose only,
+// e.g., in fast_source_line_resolver_unittest.
+//
+// Author: lambxsy@google.com (Siyang Xie)
+
+#ifndef PROCESSOR_MODULE_COMPARER_H__
+#define PROCESSOR_MODULE_COMPARER_H__
+
+#include <string>
+
+#include "processor/basic_source_line_resolver_types.h"
+#include "processor/fast_source_line_resolver_types.h"
+#include "processor/module_serializer.h"
+#include "processor/windows_frame_info.h"
+
+namespace google_breakpad {
+
+class ModuleComparer {
+ public:
+  ModuleComparer(): fast_resolver_(new FastSourceLineResolver),
+                   basic_resolver_(new BasicSourceLineResolver) { }
+  ~ModuleComparer() {
+    delete fast_resolver_;
+    delete basic_resolver_;
+  }
+
+  // BasicSourceLineResolver loads its module using the symbol data,
+  // ModuleSerializer serialize the loaded module into a memory chunk,
+  // FastSourceLineResolver loads its module using the serialized memory chunk,
+  // Then, traverse both modules together and compare underlying data
+  // return true if both modules contain exactly same data.
+  bool Compare(const string& symbol_data);
+
+ private:
+  typedef BasicSourceLineResolver::Module BasicModule;
+  typedef FastSourceLineResolver::Module FastModule;
+  typedef BasicSourceLineResolver::Function BasicFunc;
+  typedef FastSourceLineResolver::Function FastFunc;
+  typedef BasicSourceLineResolver::Line BasicLine;
+  typedef FastSourceLineResolver::Line FastLine;
+  typedef BasicSourceLineResolver::PublicSymbol BasicPubSymbol;
+  typedef FastSourceLineResolver::PublicSymbol FastPubSymbol;
+  typedef WindowsFrameInfo WFI;
+
+  bool CompareModule(const BasicModule *oldmodule,
+                     const FastModule *newmodule) const;
+  bool CompareFunction(const BasicFunc *oldfunc, const FastFunc *newfunc) const;
+  bool CompareLine(const BasicLine *oldline, const FastLine *newline) const;
+  bool ComparePubSymbol(const BasicPubSymbol*, const FastPubSymbol*) const;
+  bool CompareWFI(const WindowsFrameInfo&, const WindowsFrameInfo&) const;
+
+  // Compare ContainedRangeMap
+  bool CompareCRM(const ContainedRangeMap<MemAddr, linked_ptr<WFI> >*,
+                  const StaticContainedRangeMap<MemAddr, char>*) const;
+
+  FastSourceLineResolver *fast_resolver_;
+  BasicSourceLineResolver *basic_resolver_;
+  ModuleSerializer serializer_;
+};
+
+}  // namespace google_breakpad
+
+#endif  // PROCESSOR_MODULE_COMPARER_H__