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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__
