On Mar 25, 2013, at 6:46 PM, huc1985 <huc1985 at 163.com> wrote: > I wirte the VisitCallExpr() like this. But I can't find the Expr's AstContext > to use EvaluateAsInt() Function. How to do next？ How did you create this AST in the first place? Generally you make an ASTContext as part of that. John.