Help required for c to VCG GDL flow chart

["Sharad Pratap" <sh4r4d@xxxxxxxxx>]

I am developing a c2vcg program which takes C Program text

 and produces GDL of flow chart usable for VCG (Visual

 Compiler Graphics,) This program can now work for normal

 ANSI C some time fails on some special. In this I simply written

 a Bison Grammer file generating GDL according to Sources.

 I want for my program to  work  for  GNU C, But I am not getting

 any starting point here. I didn't understand whether GEM could help

 for this.

 Please tell whether it is possible to integrate this program/module

 in GCC or it should be totally seperate from it. work as independent

 program. If it is good to integrate in GCC so please tell how should

 I start it in GCC me a starting point.

 This is my gram.y view for one construct.

iteration_statement:
 FOR '(' ';' ';' ')' statement
        {
        crtnode (++node, strdup ("for (;;)"), "rhomb", NULL);
        crtedge (EDGE, node, $6->flows->entry, NULL, NULL);
        crtoutsedge (BENTNEAR/*EDGE*/, &($6->flows->outs), node, FORWARD);
        crtoutsedge (BACK, &($6->flows->cnt), node, FORWARD);

        $$ = $6;
        $$->flows->entry = node;
        $$->flows->sttyp = LOOP;
        push_link (&($$->flows->outs), crtnodtyp (node, LOOP));
        push_list (&($$->flows->outs), $6->flows->brk);
        $$->flows->brk = NULL;
        }

 Regard
      Sharad