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 // Copyright (c) 2010 Google Inc.

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 //

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 // modification, are permitted provided that the following conditions are

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 // this software without specific prior written permission.

 //

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 // stackwalker_amd64.h: amd64-specific stackwalker.

 //

 // Provides stack frames given amd64 register context and a memory region

 // corresponding to a amd64 stack.

 //

 // Author: Mark Mentovai, Ted Mielczarek

 #ifndef PROCESSOR_STACKWALKER_AMD64_H__

 #define PROCESSOR_STACKWALKER_AMD64_H__

 #include <vector>

 #include "google_breakpad/common/breakpad_types.h"

 #include "google_breakpad/common/minidump_format.h"

 #include "google_breakpad/processor/stackwalker.h"

 #include "google_breakpad/processor/stack_frame_cpu.h"

 #include "processor/cfi_frame_info.h"

 namespace google_breakpad {

 class CodeModules;

 class StackwalkerAMD64 : public Stackwalker {

  public:

   // context is a amd64 context object that gives access to amd64-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.

   StackwalkerAMD64(const SystemInfo* system_info,

                    const MDRawContextAMD64* context,

                    MemoryRegion* memory,

                    const CodeModules* modules,

                    StackFrameSymbolizer* frame_symbolizer);

  private:

   // A STACK CFI-driven frame walker for the AMD64

   typedef SimpleCFIWalker<uint64_t, MDRawContextAMD64> CFIWalker;

   // Implementation of Stackwalker, using amd64 context (stack pointer in %rsp,

   // stack base in %rbp) and stack conventions (saved stack pointer at 0(%rbp))

   virtual StackFrame* GetContextFrame();

   virtual StackFrame* GetCallerFrame(const CallStack* stack,

                                      bool stack_scan_allowed);

   // Use cfi_frame_info (derived from STACK CFI records) to construct

   // the frame that called frames.back(). The caller takes ownership

   // of the returned frame. Return NULL on failure.

   StackFrameAMD64* GetCallerByCFIFrameInfo(const vector<StackFrame*> &frames,

                                            CFIFrameInfo* cfi_frame_info);

   // Scan the stack for plausible return addresses. The caller takes ownership

   // of the returned frame. Return NULL on failure.

   StackFrameAMD64* GetCallerByStackScan(const vector<StackFrame*> &frames);

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

   // be returned by GetContextFrame.

   const MDRawContextAMD64* context_;

   // Our register map, for cfi_walker_.

   static const CFIWalker::RegisterSet cfi_register_map_[];

   // Our CFI frame walker.

   const CFIWalker cfi_walker_;

 };

 }  // namespace google_breakpad

 #endif  // PROCESSOR_STACKWALKER_AMD64_H__