codeql/cpp/ql/test/successor-tests/questionexpr/cfg.ql

import cpp

int getCFLine(ControlFlowNode n) {
    if n instanceof Function
    then // Functions appear at the end of the control flow, so we get
         // nicer results if we take the last position in the function,
         // rather than the function's position (which is the start).
         result = max(ControlFlowNode c | c.getControlFlowScope() = n | c.getLocation().getStartLine())
    else result = n.getLocation().getStartLine()
}

string getASuccessorOrNone(ControlFlowNode n) {
    if exists(n.getASuccessor())
    then exists (ControlFlowNode s, string trueSucc, string falseSucc |
                 s = n.getASuccessor()
             and if s = n.getATrueSuccessor() then trueSucc = "<true> "
                                              else trueSucc = ""
             and if s = n.getAFalseSuccessor() then falseSucc = "<false> "
                                               else falseSucc = ""
             and result = trueSucc + falseSucc
                        + getCFLine(s) + ": "
                        + s.toString())
    else result = "<none>"
}

from ControlFlowNode n
select n.getLocation().getFile().getShortName(),
       n.getControlFlowScope(),
       getCFLine(n),
       count(n.getAPredecessor*()), // This helps order things sensibly
       n.getLocation(),
       n,
       getASuccessorOrNone(n)