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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.
+
+// code_module.h: Carries information about code modules that are loaded
+// into a process.
+//
+// Author: Mark Mentovai
+
+#ifndef GOOGLE_AIRBAG_PROCESSOR_CODE_MODULE_H__
+#define GOOGLE_AIRBAG_PROCESSOR_CODE_MODULE_H__
+
+#include <string>
+
+namespace google_airbag {
+
+using std::string;
+
+class CodeModule {
+ public:
+  virtual ~CodeModule() {}
+
+  // The base address of this code module as it was loaded by the process.
+  // (u_int64_t)-1 on error.
+  virtual u_int64_t base_address() const = 0;
+
+  // The size of the code module.  0 on error.
+  virtual u_int64_t size() const = 0;
+
+  // The path or file name that the code module was loaded from.  Empty on
+  // error.
+  virtual string code_file() const = 0;
+
+  // An identifying string used to discriminate between multiple versions and
+  // builds of the same code module.  This may contain a uuid, timestamp,
+  // version number, or any combination of this or other information, in an
+  // implementation-defined format.  Empty on error.
+  virtual string code_identifier() const = 0;
+
+  // The filename containing debugging information associated with the code
+  // module.  If debugging information is stored in a file separate from the
+  // code module itself (as is the case when .pdb or .dSYM files are used),
+  // this will be different from code_file.  If debugging information is
+  // stored in the code module itself (possibly prior to stripping), this
+  // will be the same as code_file.  Empty on error.
+  virtual string debug_file() const = 0;
+
+  // An identifying string similar to code_identifier, but identifies a
+  // specific version and build of the associated debug file.  This may be
+  // the same as code_identifier when the debug_file and code_file are
+  // identical or when the same identifier is used to identify distinct
+  // debug and code files.
+  virtual string debug_identifier() const = 0;
+
+  // A human-readable representation of the code module's version.  Empty on
+  // error.
+  virtual string version() const = 0;
+
+  // Creates a new copy of this CodeModule object, which the caller takes
+  // ownership of.  The new CodeModule may be of a different concrete class
+  // than the CodeModule being copied, but will behave identically to the
+  // copied CodeModule as far as the CodeModule interface is concerned.
+  virtual const CodeModule* Copy() const = 0;
+};
+
+}  // namespace google_airbag
+
+#endif  // GOOGLE_AIRBAG_PROCESSOR_CODE_MODULE_H__