Re: Help ! Frozen by a comment in gcc/c-common.h!

[Ian Lance Taylor <iant@google.com>]

"Alexei I. Adamovich" <lexa@adam.botik.ru> writes:

> While modifying the C lexer to accommodate it for experimental
> C-derived language front-end, I've stumbled across the following
> comment in gcc/c-common.h before the "enum rid" definition (still
> there in gcc-4.5-20090820 snapshot):
>
> 42 /* Reserved identifiers.  This is the union of all the keywords for C,
> 43    C++, and Objective-C.  All the type modifiers have to be in one
> 44    block at the beginning, because they are used as mask bits.  There
> 45    are 27 type modifiers; if we add many more we will have to redesign
> 46    the mask mechanism.  */
> 47 
> 48 enum rid
> 49 {
> 50   /* Modifiers: */
> 51   /* C, in empirical order of frequency.  */
> 52   RID_STATIC = 0,
> 53   RID_UNSIGNED, RID_LONG,    RID_CONST, RID_EXTERN
> ...
>
> Could you please enlighten me -- is the comment still relevant? If so,
> where the usage of type modifiers entries in enum rid as mask bits can
> be seen in gcc code (or documentation, if applicable)?

I suspect that that comment is no longer relevant.  At least, I can't
seem to find the mask.  Perhaps somebody else knows.

Ian