예제 #1
0
 private static void killEnd(AbstractEndNode end) {
   MergeNode merge = end.merge();
   if (merge != null) {
     merge.removeEnd(end);
     StructuredGraph graph = end.graph();
     if (merge instanceof LoopBeginNode && merge.forwardEndCount() == 0) { // dead loop
       for (PhiNode phi : merge.phis().snapshot()) {
         propagateKill(phi);
       }
       LoopBeginNode begin = (LoopBeginNode) merge;
       // disconnect and delete loop ends & loop exits
       for (LoopEndNode loopend : begin.loopEnds().snapshot()) {
         loopend.predecessor().replaceFirstSuccessor(loopend, null);
         loopend.safeDelete();
       }
       begin.removeExits();
       FixedNode loopBody = begin.next();
       if (loopBody != null) { // for small infinite loops, the body may be killed while
         // killing the loop ends
         killCFG(loopBody);
       }
       begin.safeDelete();
     } else if (merge instanceof LoopBeginNode
         && ((LoopBeginNode) merge).loopEnds().isEmpty()) { // not
       // a
       // loop
       // anymore
       graph.reduceDegenerateLoopBegin((LoopBeginNode) merge);
     } else if (merge.phiPredecessorCount() == 1) { // not a merge anymore
       graph.reduceTrivialMerge(merge);
     }
   }
 }
예제 #2
0
 /**
  * The {@link com.oracle.graal.nodes.AbstractEndNode} at the end of the current code path
  * contributes values to {@link com.oracle.graal.nodes.PhiNode}s. Now is a good time to {@link
  * EquationalReasoner#deverbosify(com.oracle.graal.graph.Node) EquationalReasoner#deverbosify}
  * those values.
  *
  * <p>Precondition: inputs haven't been deverbosified yet.
  */
 private void visitAbstractEndNode(AbstractEndNode endNode) {
   MergeNode merge = endNode.merge();
   for (PhiNode phi : merge.phis()) {
     if (phi instanceof ValuePhiNode && phi.getKind() == Kind.Object) {
       assert phi.verify();
       int index = merge.phiPredecessorIndex(endNode);
       ValueNode original = phi.valueAt(index);
       ValueNode reduced = (ValueNode) reasoner.deverbosify(original);
       if (reduced != original) {
         phi.setValueAt(index, reduced);
         // `original` if unused will be removed in finished()
       }
     }
   }
 }