src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.core.common/src/org/graalvm/compiler/core/common/cfg/AbstractBlockBase.java

*** 20,42 ****
   * or visit www.oracle.com if you need additional information or have any
   * questions.
   */
  package org.graalvm.compiler.core.common.cfg;
  
- import java.util.Collections;
- import java.util.List;
- 
  public abstract class AbstractBlockBase<T extends AbstractBlockBase<T>> {
  
      protected int id;
      protected int domDepth;
  
      protected T[] predecessors;
      protected T[] successors;
  
      private T dominator;
!     private List<T> dominated;
      private int domNumber;
      private int maxChildDomNumber;
  
      private boolean align;
      private int linearScanNumber;
--- 20,40 ----
   * or visit www.oracle.com if you need additional information or have any
   * questions.
   */
  package org.graalvm.compiler.core.common.cfg;
  
  public abstract class AbstractBlockBase<T extends AbstractBlockBase<T>> {
  
      protected int id;
      protected int domDepth;
  
      protected T[] predecessors;
      protected T[] successors;
  
      private T dominator;
!     private T firstDominated;
!     private T dominatedSibling;
      private int domNumber;
      private int maxChildDomNumber;
  
      private boolean align;
      private int linearScanNumber;
*** 95,117 ****
      public void setDominator(T dominator) {
          this.dominator = dominator;
          this.domDepth = dominator.domDepth + 1;
      }
  
      public int getDominatorDepth() {
          return domDepth;
      }
  
!     public List<T> getDominated() {
!         if (dominated == null) {
!             return Collections.emptyList();
          }
!         return dominated;
      }
  
!     public void setDominated(List<T> blocks) {
!         dominated = blocks;
      }
  
      @Override
      public String toString() {
          return "B" + id;
--- 93,123 ----
      public void setDominator(T dominator) {
          this.dominator = dominator;
          this.domDepth = dominator.domDepth + 1;
      }
  
+     /**
+      * Level in the dominator tree starting with 0 for the start block.
+      */
      public int getDominatorDepth() {
          return domDepth;
      }
  
!     public T getFirstDominated() {
!         return this.firstDominated;
      }
! 
!     public void setFirstDominated(T block) {
!         this.firstDominated = block;
!     }
! 
!     public T getDominatedSibling() {
!         return this.dominatedSibling;
      }
  
!     public void setDominatedSibling(T block) {
!         this.dominatedSibling = block;
      }
  
      @Override
      public String toString() {
          return "B" + id;
*** 156,161 ****
--- 162,172 ----
      public abstract T getPostdominator();
  
      public abstract double probability();
  
      public abstract T getDominator(int distance);
+ 
+     @Override
+     public int hashCode() {
+         return id;
+     }
  }