CodeQL library for Swift
codeql/swift-all 2.0.4-dev (changelog, source)
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Predicate signature InputSig::variableWrite

Holds if the ith node of basic block bb is a (potential) write to source variable v. The Boolean certain indicates whether the write is certain.

Examples of uncertain writes are ref arguments in C#, where it is the callee that may or may not update the argument.

signature predicate variableWrite(BasicBlock bb, int i, SourceVariable v, boolean certain)