CodeQL library for Java
codeql/java-all 0.4.4 (changelog, source)
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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)