src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.nodes/src/org/graalvm/compiler/nodes/PhiNode.java

*** 130,145 ****
--- 130,157 ----
                  if (i != 0) {
                      str.append(' ');
                  }
                  str.append(valueAt(i) == null ? "-" : valueAt(i).toString(Verbosity.Id));
              }
+             String description = valueDescription();
+             if (description.length() > 0) {
+                 str.append(", ").append(description);
+             }
              return super.toString(Verbosity.Name) + "(" + str + ")";
          } else {
              return super.toString(verbosity);
          }
      }
  
+     /**
+      * String describing the kind of value this Phi merges. Used by {@link #toString(Verbosity)} and
+      * dumping.
+      */
+     protected String valueDescription() {
+         return "";
+     }
+ 
      public void addInput(ValueNode x) {
          assert !(x instanceof ValuePhiNode) || ((ValuePhiNode) x).merge() instanceof LoopBeginNode || ((ValuePhiNode) x).merge() != this.merge();
          assert !(this instanceof ValuePhiNode) || x.stamp().isCompatible(stamp());
          values().add(x);
      }