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Title: Dataflow: Overlay informed dataflow. by alexet · Pull Request #20386 · github/codeql · GitHub

Open Graph Title: Dataflow: Overlay informed dataflow. by alexet · Pull Request #20386 · github/codeql

X Title: Dataflow: Overlay informed dataflow. by alexet · Pull Request #20386 · github/codeql

Description: This adds overlay informed Dataflow. The idea is that for non-diff-informed configurations we use the diff informed mechanism to filter the sources and sinks to the overlay and then merge those results with the base results. This can lead to FPs/FNs due to flow paths via the overlay but the accuracy seems well within what we are targetting for overlay mode and saves lots of time. Unfortunately the merging code cannot instantiated with CPP analysis as it uses EquivalenceRelation internally. This means we need separate parametrised modules (as we can't just guard with a predicate). The local results are also exposed for cases where the pure local results are desired (e.g. for regexes where we are only going to care about analysing new regexes in the overlay).

Open Graph Description: This adds overlay informed Dataflow. The idea is that for non-diff-informed configurations we use the diff informed mechanism to filter the sources and sinks to the overlay and then merge those res...

X Description: This adds overlay informed Dataflow. The idea is that for non-diff-informed configurations we use the diff informed mechanism to filter the sources and sinks to the overlay and then merge those res...

Opengraph URL: https://github.com/github/codeql/pull/20386

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8c02130 DataFlow: Rearrange files to group the parts that can be shared with … alexet Sep 18, 2025 https://github.com/github/codeql/pull/20386/commits/8c02130bcfa11d152dc656f383de32abe5bf23fe
82e4fc9 AlertFiltering: Expose filtering further. alexet Sep 18, 2025 https://github.com/github/codeql/pull/20386/commits/82e4fc9f0ff21042bd39ade62910c4070a9a2b33
c49e2ab DataFlow: Add code to do overlay informed dataflow. alexet Sep 18, 2025 https://github.com/github/codeql/pull/20386/commits/c49e2ab2dacc12f396db0eb34341bb8acf51adc0
3c110f2 DataFlow: Add code for merging base with overlay. alexet Sep 19, 2025 https://github.com/github/codeql/pull/20386/commits/3c110f2eb80ea316e3b9f0e60feba02e65abf983
542bdf0 Java: Use Overlay dataflow in java. alexet Sep 24, 2025 https://github.com/github/codeql/pull/20386/commits/542bdf079291f5ef12ceffcd2bb3142f71ed08e8
7a8d239 Daatflow: Fix bug alexet Sep 25, 2025 https://github.com/github/codeql/pull/20386/commits/7a8d2392eeac95ed7010bfacb22c49e3b7470331
193cd46 DataFlow: Adress comments on overlay informed dataflow alexet Oct 3, 2025 https://github.com/github/codeql/pull/20386/commits/193cd46a767a0854396cf66b31296263ffc45686
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