Re: PATCH: Yet another ObjC-ish "hook" in c-decl.c

["Joseph S. Myers" <jsm at polyomino dot org dot uk>]

On Thu, 2 Sep 2004, Ziemowit Laski wrote:

> Actually, I didn't find the arg_info trees that cryptic, since they contain
> pre-chewed PARM_DECLs and TYPE_DECLs.  I'm also not sure why you'd want to
> change this, but I guess we can worry about this later.

They are accessed by

#define ARG_INFO_PARMS(args)  TREE_PURPOSE(args)
#define ARG_INFO_TAGS(args)   TREE_VALUE(args)
#define ARG_INFO_TYPES(args)  TREE_CHAIN(args)
#define ARG_INFO_OTHERS(args) TREE_TYPE(args)

but not entirely consistently, but also built up manually in the parser 
without those macros.  Although not strictly necessary to change as part 
of moving declarators from trees (they are contained in, rather than 
containing, declarators, and don't need to store constant expression 
flags), in the interests of reducing garbage production associated with 
declarators (and the general interests of better static typing rather than 
making everything a tree) it seemed appropriate to replace them by a more 
specific structure

struct c_arg_info {
  tree parms;
  tree tags;
  tree types;
  tree others;
};

that could be allocated along with the declarators on a parser obstack.

-- 
Joseph S. Myers               http://www.srcf.ucam.org/~jsm28/gcc/
  http://www.srcf.ucam.org/~jsm28/gcc/#c90status - status of C90 for GCC 3.5
    jsm@polyomino.org.uk (personal mail)
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