Class TypeTracker

DEPRECATED: Use semmle.python.dataflow.new.TypeTracking instead.

A summary of the steps needed to track a value to a given dataflow node.

This can be used to track objects that implement a certain API in order to recognize calls to that API. Note that type-tracking does not by itself provide a source/sink relation, that is, it may determine that a node has a given type, but it won’t determine where that type came from.

It is recommended that all uses of this type are written in the following form, for tracking some type myType:

DataFlow::TypeTrackingNode myType(DataFlow::TypeTracker t) {
  t.start() and
  result = < source of myType >
  or
  exists (DataFlow::TypeTracker t2 |
    result = myType(t2).track(t2, t)
  )
}

DataFlow::Node myType() { myType(DataFlow::TypeTracker::end()).flowsTo(result) }

Instead of result = myType(t2).track(t2, t), you can also use the equivalent t = t2.step(myType(t2), result). If you additionally want to track individual intra-procedural steps, use t = t2.smallstep(myCallback(t2), result).

Import path

import semmle.python.dataflow.new.internal.TypeTracker

Direct supertypes

TTypeTracker

Known direct subtypes

TypeTracker

Fields

content
hasCall

Predicates

append	Gets the summary resulting from appending `step` to this type-tracking summary.
call	Holds if this is the starting point of type tracking when tracking a parameter into a call, but not out of it.
continue	Gets a type tracker that starts where this one has left off to allow continued tracking.
end	Holds if this is the end point of type tracking.
getContent	INTERNAL. DO NOT USE.
hasCall	INTERNAL. DO NOT USE.
smallstep	Gets the summary that corresponds to having taken a forwards local, heap and/or inter-procedural step from `nodeFrom` to `nodeTo`.
start	Holds if this is the starting point of type tracking.
startInContent	Holds if this is the starting point of type tracking, and the value starts in the content named `contentName`. The type tracking only ends after the content has been loaded.
step	Gets the summary that corresponds to having taken a forwards heap and/or inter-procedural step from `nodeFrom` to `nodeTo`.
toString	Gets a textual representation of this summary.

Charpred

TypeTracker