src/hotspot/share/gc/shared/gcName.hpp

*** 37,10 ***
--- 37,12 ---
    G1Full,
    ZMinor,
    ZMajor,
    Z, // Support for the legacy, single-gen mode
    Shenandoah,
+   ShenandoahYoung,
+   ShenandoahOld,
    NA,
    GCNameEndSentinel
  };
  
  class GCNameHelper {

*** 56,10 ***
--- 58,12 ---
        case G1Full: return "G1Full";
        case ZMinor: return "ZGC Minor";
        case ZMajor: return "ZGC Major";
        case Z: return "Z";
        case Shenandoah: return "Shenandoah";
+       case ShenandoahYoung: return "Shenandoah Young";
+       case ShenandoahOld: return "Shenandoah Old";
        case NA: return "N/A";
        default: ShouldNotReachHere(); return nullptr;
      }
    }
  };