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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.
-
-// stackwalker.h: Generic stackwalker.
-//
-// The Stackwalker class is an abstract base class providing common generic
-// methods that apply to stacks from all systems.  Specific implementations
-// will extend this class by providing GetContextFrame and GetCallerFrame
-// methods to fill in system-specific data in a StackFrame structure.
-// Stackwalker assembles these StackFrame strucutres into a CallStack.
-//
-// Author: Mark Mentovai
-
-
-#ifndef PROCESSOR_STACKWALKER_H__
-#define PROCESSOR_STACKWALKER_H__
-
-#include <vector>
-
-namespace google_airbag {
-
-class CallStack;
-template<typename T> class linked_ptr;
-class MemoryRegion;
-class MinidumpContext;
-class MinidumpModuleList;
-struct StackFrame;
-struct StackFrameInfo;
-class SymbolSupplier;
-
-using std::vector;
-
-
-class Stackwalker {
- public:
-  virtual ~Stackwalker() {}
-
-  // Creates a new CallStack and populates it by calling GetContextFrame and
-  // GetCallerFrame.  The frames are further processed to fill all available
-  // data.  The caller takes ownership of the CallStack returned by Walk.
-  CallStack* Walk();
-
-  // Returns a new concrete subclass suitable for the CPU that a stack was
-  // generated on, according to the CPU type indicated by the context
-  // argument.  If no suitable concrete subclass exists, returns NULL.
-  static Stackwalker* StackwalkerForCPU(MinidumpContext *context,
-                                        MemoryRegion *memory,
-                                        MinidumpModuleList *modules,
-                                        SymbolSupplier *supplier);
-
- protected:
-  // memory identifies a MemoryRegion that provides the stack memory
-  // for the stack to walk.  modules, if non-NULL, is a MinidumpModuleList
-  // that is used to look up which code module each stack frame is
-  // associated with.  supplier is an optional caller-supplied SymbolSupplier
-  // implementation.  If supplier is NULL, source line info will not be
-  // resolved.
-  Stackwalker(MemoryRegion *memory,
-              MinidumpModuleList *modules,
-              SymbolSupplier *supplier);
-
-  // The stack memory to walk.  Subclasses will require this region to
-  // get information from the stack.
-  MemoryRegion *memory_;
-
- private:
-  // Obtains the context frame, the innermost called procedure in a stack
-  // trace.  Returns NULL on failure.  GetContextFrame allocates a new
-  // StackFrame (or StackFrame subclass), ownership of which is taken by
-  // the caller.
-  virtual StackFrame* GetContextFrame() = 0;
-
-  // Obtains a caller frame.  Each call to GetCallerFrame should return the
-  // frame that called the last frame returned by GetContextFrame or
-  // GetCallerFrame.  To aid this purpose, stack contains the CallStack
-  // made of frames that have already been walked.  GetCallerFrame should
-  // return NULL on failure or when there are no more caller frames (when
-  // the end of the stack has been reached).  GetCallerFrame allocates a new
-  // StackFrame (or StackFrame subclass), ownership of which is taken by
-  // the caller.
-  virtual StackFrame* GetCallerFrame(
-      const CallStack *stack,
-      const vector< linked_ptr<StackFrameInfo> > &stack_frame_info) = 0;
-
-  // A list of modules, for populating each StackFrame's module information.
-  // This field is optional and may be NULL.
-  MinidumpModuleList *modules_;
-
-  // The optional SymbolSupplier for resolving source line info.
-  SymbolSupplier *supplier_;
-};
-
-
-}  // namespace google_airbag
-
-
-#endif  // PROCESSOR_STACKWALKER_H__