code: def _parse_file(self):
          
  
          # We need to set the CPU type to pull in the right register definitions
          # only preprocess the file (-E) and get rid of gcc extensions that aren't
          # supported in ISO C.
          args = utilities.build_includes(self.arch.includes())
  
          # args.append('-mcpu=%s' % self.arch.property('chip'))
          args.append('-E')
          args.append('-D__attribute__(x)=')
          args.append('-D__extension__=')
          self.ast = parse_file(self.filepath, use_cpp=True, cpp_path='arm-none-eabi-gcc', cpp_args=args)
docs: Preprocess and parse C file into an AST