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// Copyright (c) 2010 Google Inc.

// All rights reserved.

//

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// stackwalker_ppc.h: ppc-specific stackwalker.

//

// Provides stack frames given ppc register context and a memory region

// corresponding to a ppc stack.

//

// Author: Mark Mentovai

#ifndef PROCESSOR_STACKWALKER_PPC_H__

#define PROCESSOR_STACKWALKER_PPC_H__

#include "google_breakpad/common/breakpad_types.h"

#include "google_breakpad/common/minidump_format.h"

#include "google_breakpad/processor/stackwalker.h"

namespace google_breakpad {

class CodeModules;

class StackwalkerPPC : public Stackwalker {

 public:

  // context is a ppc context object that gives access to ppc-specific

  // register state corresponding to the innermost called frame to be

  // included in the stack.  The other arguments are passed directly through

  // to the base Stackwalker constructor.

  StackwalkerPPC(const SystemInfo* system_info,

                 const MDRawContextPPC* context,

                 MemoryRegion* memory,

                 const CodeModules* modules,

                 StackFrameSymbolizer* frame_symbolizer);

 private:

  // Implementation of Stackwalker, using ppc context (stack pointer in %r1,

  // saved program counter in %srr0) and stack conventions (saved stack

  // pointer at 0(%r1), return address at 8(0(%r1)).

  virtual StackFrame* GetContextFrame();

  virtual StackFrame* GetCallerFrame(const CallStack* stack,

                                     bool stack_scan_allowed);

  // Stores the CPU context corresponding to the innermost stack frame to

  // be returned by GetContextFrame.

  const MDRawContextPPC* context_;

};

}  // namespace google_breakpad

#endif  // PROCESSOR_STACKWALKER_PPC_H__