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codeql/python/ql/test/library-tests/ControlFlow/evaluation-order/NoBackwardFlow.ql
Taus 710a43ac7f Python: Add some CFG-validation queries
These use the annotated, self-verifying test files to check various
consistency requirements.

Some of these may be expressing the same thing in different ways, but
it's fairly cheap to keep them around, so I have not attempted to
produce a minimal set of queries for this.
2026-05-05 15:21:40 +00:00

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/**
* Checks that time never flows backward between consecutive timer annotations
* in the CFG. For each pair of consecutive annotated nodes (A -> B), there must
* exist timestamps a in A and b in B with a < b.
*/
import python
import TimerUtils
from TimerCfgNode a, TimerCfgNode b, int minA, int maxB
where
nextTimerAnnotation(a, b) and
not a.isDead() and
not b.isDead() and
minA = min(a.getATimestamp()) and
maxB = max(b.getATimestamp()) and
minA >= maxB
select a, "Backward flow: $@ flows to $@ (max timestamp $@)", a.getTimestampExpr(minA),
minA.toString(), b, b.getNode().toString(), b.getTimestampExpr(maxB), maxB.toString()