GCC C语言处理主要函数之c_init_decl_processing

/* Create the predefined scalar types of C,   and some nodes representing standard constants (0, 1, (void *) 0).   Initialize the global scope.   Make definitions for built-in primitive functions.  */
voidc_init_decl_processing (void){  location_t save_loc = input_location;
  /* Initialize reserved words for parser.  */  c_parse_init ();
  current_function_decl = 0;
  gcc_obstack_init (&parser_obstack);
  /* Make the externals scope.  */  push_scope ();  external_scope = current_scope;
  /* Declarations from c_common_nodes_and_builtins must not be associated     with this input file, lest we get differences between using and not     using preprocessed headers.  */  input_location = BUILTINS_LOCATION;
  c_common_nodes_and_builtins ();
  /* In C, comparisons and TRUTH_* expressions have type int.  */  truthvalue_type_node = integer_type_node;  truthvalue_true_node = integer_one_node;  truthvalue_false_node = integer_zero_node;
  /* Even in C99, which has a real boolean type.  */  pushdecl (build_decl (UNKNOWN_LOCATION, TYPE_DECL, get_identifier ("_Bool"),   boolean_type_node));
  input_location = save_loc;
  make_fname_decl = c_make_fname_decl;  start_fname_decls ();}