Predicate nullGuard

Gets a Guard that tests (possibly indirectly) whether a given SSA variable is null or not.

If result evaluates to branch, then v is guaranteed to be null if isnull is true, and non-null if isnull is false.

Import path

import semmle.code.java.dataflow.NullGuards

Guard nullGuard(SsaVariable v, boolean branch, boolean isnull)