GCC C语言处理主要函数之c_common_init

最新推荐文章于 2024-05-25 11:07:35 发布

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本文详细介绍了C语言中用于前端初始化的通用流程c_common_init。该函数负责设置预处理器算术，并初始化各种类型节点和内置函数。此外还涉及字符精度、整数精度等配置，并在完成初始化后进行版本校验。

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c_common_init:


/* Front end initialization common to C, ObjC and C++.  */
bool c_common_init (void)
{
  /* Set up preprocessor arithmetic.  Must be done after call to
     c_common_nodes_and_builtins for type nodes to be good.  */
  cpp_opts->precision = TYPE_PRECISION (intmax_type_node);
  cpp_opts->char_precision = TYPE_PRECISION (char_type_node);
  cpp_opts->int_precision = TYPE_PRECISION (integer_type_node);
  cpp_opts->wchar_precision = TYPE_PRECISION (wchar_type_node);
  cpp_opts->unsigned_wchar = TYPE_UNSIGNED (wchar_type_node);
  cpp_opts->bytes_big_endian = BYTES_BIG_ENDIAN;
  /* This can't happen until after wchar_precision and bytes_big_endian
     are known.  */
  cpp_init_iconv (parse_in);
  if (version_flag)
    {
      int i;
      fputs ("Compiler executable checksum: ", stderr);
      for (i = 0; i < 16; i++)
 fprintf (stderr, "%02x", executable_checksum[i]);
      putc ('\n', stderr);
    }
  /* Has to wait until now so that cpplib has its hash table.  */
  init_pragma ();
  if (flag_preprocess_only)
    {
      c_finish_options ();
      preprocess_file (parse_in);
      return false;
    }
  return true;
}