Re: pruning unused debugging types (enums/PR23336)

[Aldy Hernandez <aldyh@redhat.com>]

On Thu, Nov 17, 2005 at 10:24:21PM -0800, Mark Mitchell wrote:
> Richard Henderson wrote:
> 
> > A solution that comes to mind is to have the front-end add dummy
> > TYPE_DECL nodes to the BLOCK_VARS list of the function's outer-most
> > BLOCK.  If the TYPE_DECL node were marked DECL_ARTIFICIAL and had
> > no DECL_NAME, it'd be easy for us to notice that we shouldn't 
> > actually emit debug info for the TYPE_DECL itself, but that we
> > should consider its TREE_TYPE to be used.
> > 
> > I'm open to better schemes.  Perhaps a used-type hash table in
> > the struct function.
> 
> I like the idea, but I think a hash table would be better.  In fact, I
> think the best choice would be a hash table during compilation of the
> function, transformed into a vector after the closing brace of the

Either way is fine by me.  Just to make sure I understand things;
you want me to hack the front-end to fill the hash table every time
it parses a cast or enum type?

For example:

Index: c-parser.c
===================================================================
--- c-parser.c  (revision 107115)
+++ c-parser.c  (working copy)
@@ -4485,6 +4485,7 @@ c_parser_cast_expression (c_parser *pars
          ret.original_code = ERROR_MARK;
          return ret;
        }
+      add_to_some_hash (TREE_TYPE (groktypename (type_name)));
       if (c_parser_next_token_is (parser, CPP_OPEN_BRACE))
        return c_parser_postfix_expression_after_paren_type (parser,

Thanks.