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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 "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,
                   SymbolSupplier *supplier,
                   SourceLineResolverInterface *resolver);

 private:
  // A STACK CFI-driven frame walker for the AMD64
  typedef SimpleCFIWalker<u_int64_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);

  // 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__