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/**

* @name Potentially uninitialized local variable

* @description Using a local variable before it is initialized causes an UnboundLocalError.

* @kind problem

* @tags reliability

* correctness

* @problem.severity error

* @sub-severity low

* @precision medium

* @id py/uninitialized-local-variable

*/

import python

import Undefined

import semmle.python.pointsto.PointsTo

predicate uninitialized_local(NameNode use) {

exists(FastLocalVariable local | use.uses(local) or use.deletes(local) |

not local.escapes() and not local = any(Nonlocal nl).getAVariable()

) and

(

any(Uninitialized uninit).taints(use) and

PointsToInternal::reachableBlock(use.getBasicBlock(), _)

or

not exists(EssaVariable var | var.getASourceUse() = use)

)

}

predicate explicitly_guarded(NameNode u) {

exists(Try t |

t.getBody().contains(u.getNode()) and

t.getAHandler().getType().pointsTo(ClassValue::nameError())

)

}

from NameNode u

where uninitialized_local(u) and not explicitly_guarded(u)

select u.getNode(), "Local variable '" + u.getId() + "' may be used before it is initialized."