lib/AST/ExprConstant.cpp

802     /// CallStackDepth - The number of calls in the call stack right now.
803     unsigned CallStackDepth;
818     /// initialized after CurrentCall and CallStackDepth.
973           CallStackDepth(0), NextCallIndex(1),
996       if (checkingPotentialConstantExpression() && CallStackDepth > 1)
1003       if (CallStackDepth <= getLangOpts().ConstexprCallDepth)
1015       unsigned Depth = CallStackDepth;
1149     unsigned getCallStackDepth() override { return CallStackDepth; }
1323       Info.SpeculativeEvaluationDepth = Info.CallStackDepth + 1;
1443   ++Info.CallStackDepth;
1448   --Info.CallStackDepth;
11654         (Info.CallStackDepth == 1 ||
11655          (Info.CallStackDepth == 2 && Callee->isInStdNamespace() &&
11660         Info.report((Info.CallStackDepth == 1) ? E->getExprLoc()
11663             << (Info.CallStackDepth == 1 ? "__builtin_is_constant_evaluated"