[cfe-dev] Iterating over a CFGBlock excluding subexpressions

[Stefan Schulze Frielinghaus via cfe-dev]

Hi all,

Is there some way to iterate over a CFGBlock excluding subexpressions?

Currently I iterate over a CFGBlock as e.g.

   const CFGBlock *block;
   /* ... */
   for (const auto &I : *block) {
     if (Optional<CFGStmt> S = I.getAs<CFGStmt>())
       foo(const_cast<Stmt*>(S->getStmt()));
   }

where function foo *recursively* descends into statements.  This has the
drawback that I visit some (sub)expressions twice: one time via the loop and
another time by recursively descending into subexpressions via function foo.
For example, a CFGBlock for a single statement e1=e2 looks as follows:

   <begin>  (e2)  (e1)  (e1=e2)  <end>

Therefore, I would first call foo for e2, then for e1, and in the end for e1=e2
where I would recursively call foo for e1 and e2 again. Although they have been
visited previously.

Maybe this is not the supposed way to iterate over a CFGBlock?

Cheers,
Stefan