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CFG: Add two more consistency checks #17724

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CFG: Add two more consistency checks #17724

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10 changes: 10 additions & 0 deletions shared/controlflow/codeql/controlflow/Cfg.qll
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Original file line number Diff line number Diff line change
Expand Up @@ -1395,5 +1395,15 @@ module Make<LocationSig Location, InputSig<Location> Input> {

/** Holds if CFG scope `scope` lacks an initial AST node. */
query predicate scopeNoFirst(CfgScope scope) { not scopeFirst(scope, _) }

/** Holds if `node` is appears in `first` but not in `succ`. */
query predicate firstNoSucc(AstNode node) {
first(_, node) and not succ(node, _, _) and not succ(_, node, _)
}

/** Holds if `node` is appears in `first` but not in `succ`. */
query predicate lastNoSucc(AstNode node) {
last(_, node, _) and not succ(node, _, _) and not succ(_, node, _)
}
}
}
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