Class TypeTracker

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:

Node myType(TypeTracker tt) {
  tt.start() and
  result = < source of myType >
  or
  exists(TypeTracker tt2 |
    tt = tt2.step(myType(tt2), result)
  )
}

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

If you want to track individual intra-procedural steps, use tt2.smallstep instead of tt2.step.

Import path

import semmle.python.dataflow.new.TypeTracking

Direct supertypes

TypeTracker

Indirect supertypes

TTypeTracker

Predicates

getAttr	INTERNAL. DO NOT USE.
startInAttr	Holds if this is the starting point of type tracking, and the value starts in the attribute named `attrName`. The type tracking only ends after the attribute has been loaded.

Inherited predicates

call	Holds if this is the starting point of type tracking when tracking a parameter into a call, but not out of it.	from TypeTracker
continue	Gets a type tracker that starts where this one has left off to allow continued tracking.	from TypeTracker
end	Holds if this is the end point of type tracking.	from TypeTracker
getContent	INTERNAL. DO NOT USE.	from TypeTracker
smallstep	Gets the summary that corresponds to having taken a forwards local, heap and/or inter-procedural step from `nodeFrom` to `nodeTo`.	from TypeTracker
start	Holds if this is the starting point of type tracking.	from TypeTracker
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.	from TypeTracker
step	Gets the summary that corresponds to having taken a forwards heap and/or inter-procedural step from `nodeFrom` to `nodeTo`.	from TypeTracker
toString	Gets a textual representation of this summary.	from TypeTracker