Merge pull request #1713 from markshannon/python-remove-parents

Python taint-tracking: Remove 'parents' query from path-queries.

python/ql/src/semmle/python/security/Paths.qll

@@ -7,21 +7,3 @@ query predicate edges(TaintedNode fromnode, TaintedNode tonode) {
     /* Don't record flow past sinks */
     not fromnode.isSink()
 }
-
-private TaintedNode first_child(TaintedNode parent) {
-    result.getContext().getCaller() = parent.getContext() and
-    edges(parent, result)
-}
-
-private TaintedNode next_sibling(TaintedNode child) {
-    edges(child, result) and
-    child.getContext() = result.getContext()
-}
-
-query predicate parents(TaintedNode child, TaintedNode parent) {
-    child = first_child(parent) or
-    exists(TaintedNode prev |
-        parents(prev, parent) and
-        child = next_sibling(prev)
-    )
-}