CodeQL library for Java
codeql/java-all 0.5.1 (changelog, source)
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Predicate allowParameterReturnInSelf

Holds if flow is allowed to pass from parameter p and back to itself as a side-effect, resulting in a summary from p to itself.

One example would be to allow flow like p.foo = p.bar;, which is disallowed by default as a heuristic.

Import path

import semmle.code.java.dataflow.internal.DataFlowPrivate
predicate allowParameterReturnInSelf(ParameterNode p)