CodeQL library for C#
codeql/csharp-all 1.0.1 (changelog, source)

Member predicate BasicBlock::immediatelyDominates

Holds if this basic block immediately dominates basic block bb.

That is, all paths reaching basic block bb from some entry point basic block must go through this basic block (which is an immediate predecessor of bb).


int M(string s) {
  if (s == null)
    throw new ArgumentNullException(nameof(s));
  return s.Length;

The basic block starting on line 2 strictly dominates the basic block on line 4 (all paths from the entry point of M to return s.Length; must go through the null check).

predicate immediatelyDominates(BasicBlock bb)