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Observations: * revFlowThrough can be much larger than the other reverse-flow predicates, presumably when there are many different innerReturnAps. * It is only ever used in conjunction with flowThroughIntoCall, which can therefore be pushed in, and several of its parameters can thereby be dropped in exchange for exposing `arg`. * `revFlowThroughArg` can then be trivially inlined. Result: on repository `go-gitea/gitea` with PR https://github.com/github/codeql/pull/17701 producing a wider selection of access paths than are seen on `main`, `revFlowThrough` drops in size from ~120m tuples to ~4m, and the runtime of the reverse-flow computation for dataflow stage 4 goes from dominating the forward-flow cost to relatively insignificant. Overall runtime falls from 3 minutes to 2 with substantial ram available, and presumably falls much more under GHA-style memory pressure.
CodeQL Shared Libraries
This folder contains shared, language-agnostic CodeQL libraries.
Libraries are organized into separate query packs, in order to allow for
individual versioning. For example, the shared static single assignment (SSA)
library exists in the codeql/ssa pack, which can be referenced by adding
dependencies:
codeql/ssa: 0.0.1
to qlpack.yml.
All shared libraries will belong to a codeql/<name> pack, and live in the
namespace codeql.<name>.