CodeQL library for C/C++
codeql/cpp-all 0.5.1 (changelog, source)
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Member predicate Make::Definition::definesAt

Holds if this SSA definition defines v at index i in basic block bb. Phi nodes are considered to be at index -1, while normal variable writes are at the index of the control flow node they wrap.

predicate definesAt(SourceVariable v, BasicBlock bb, int i)