Don't demangle symbol names.

  return impl_->Unwind(num_ignore_frames, ucontext);

}

extern "C" char* __cxa_demangle(const char* mangled, char* buf, size_t* len,

                                int* status);

std::string Backtrace::GetFunctionName(uintptr_t pc, uintptr_t* offset) {

  std::string func_name = impl_->GetFunctionNameRaw(pc, offset);

  if (!func_name.empty()) {

#if defined(__APPLE__)

    // Mac OS' __cxa_demangle demangles "f" as "float"; last tested on 10.7.

    if (func_name[0] != '_') {

      return func_name;

    }

#endif

    char* name = __cxa_demangle(func_name.c_str(), 0, 0, 0);

    if (name) {

      func_name = name;

      free(name);

    }

  }

  return func_name;

}