Extend.ql

import python
import semmle.python.pointsto.PointsTo
private import semmle.python.types.Extensions

class CfgExtension extends CustomPointsToOriginFact {
  CfgExtension() {
    this.(NameNode).getId() = "one"
    or
    this.(NameNode).getId() = "two"
  }

  override predicate pointsTo(Object value, ClassObject cls) {
    cls = theIntType() and
    (
      this.(NameNode).getId() = "one" and value.(NumericObject).intValue() = 1
      or
      this.(NameNode).getId() = "two" and value.(NumericObject).intValue() = 2
    )
  }
}

class AttributeExtension extends CustomPointsToAttribute {
  AttributeExtension() { this = this }

  override predicate attributePointsTo(
    string name, Object value, ClassObject cls, ControlFlowNode origin
  ) {
    cls = theIntType() and
    origin = any(Module m).getEntryNode() and
    (
      name = "three" and value.(NumericObject).intValue() = 3
      or
      name = "four" and value.(NumericObject).intValue() = 4
    )
  }
}

class NoClassExtension extends CustomPointsToObjectFact {
  NoClassExtension() { this = this }

  override predicate pointsTo(Object value) {
    this.(NameNode).getId() = "five" and value.(NumericObject).intValue() = 5
    or
    this.(NameNode).getId() = "six" and value.(NumericObject).intValue() = 6
  }
}

/* Check that we can use old API without causing non-monotonic recursion */
class RecurseIntoOldPointsTo extends CustomPointsToOriginFact {
  RecurseIntoOldPointsTo() { PointsTo::points_to(this, _, unknownValue(), _, _) }

  override predicate pointsTo(Object value, ClassObject cls) {
    value = unknownValue() and cls = theUnknownType()
  }
}

from ControlFlowNode f, Object o
where f.getLocation().getFile().getBaseName() = "test.py" and f.refersTo(o)
select f, o.toString()