AstBuilder.java 文件源码

@Override
public Object visit(ParseTree tree) {
    if (tree == null) {
        System.err.print("visit null");
        Exception ex = new Exception();
        ex.printStackTrace(System.err);
        return null;
    }
    if(tree instanceof StatContext && returned){
        diagnosisReporter.report(Diagnosis.Kind.ERROR
                ,"unreachable statement"
                , (StatContext) tree
        );
    }
    return super.visit(tree);
}