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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.
+
+// call_stack.h: A call stack comprised of stack frames.
+//
+// This class manages a vector of stack frames.  It is used instead of
+// exposing the vector directly to allow the CallStack to own StackFrame
+// pointers without having to publicly export the linked_ptr class.  A
+// CallStack must be composed of pointers instead of objects to allow for
+// CPU-specific StackFrame subclasses.
+//
+// By convention, the stack frame at index 0 is the innermost callee frame,
+// and the frame at the highest index in a call stack is the outermost
+// caller.  CallStack only allows stacks to be built by pushing frames,
+// beginning with the innermost callee frame.
+//
+// Author: Mark Mentovai
+
+#ifndef GOOGLE_CALL_STACK_H__
+#define GOOGLE_CALL_STACK_H__
+
+#include <vector>
+
+namespace google_airbag {
+
+using std::vector;
+
+struct StackFrame;
+template<typename T> class linked_ptr;
+
+class CallStack {
+ public:
+  ~CallStack();
+
+  const vector<StackFrame*>* frames() const { return &frames_; }
+
+ private:
+  // Stackwalker is responsible for building the frames_ vector.
+  friend class Stackwalker;
+
+  // Storage for pushed frames.
+  vector<StackFrame*> frames_;
+};
+
+}  // namespace google_airbag
+
+#endif  // GOOGLE_CALL_STACK_H__