Exemplo n.º 1
0
 public static void unlinkFixedNode(FixedWithNextNode fixed) {
   assert fixed.next() != null && fixed.predecessor() != null && fixed.isAlive();
   FixedNode next = fixed.next();
   fixed.setNext(null);
   fixed.replaceAtPredecessor(next);
 }
  private void visitDeoptBegin(
      AbstractBeginNode deoptBegin,
      DeoptimizationAction deoptAction,
      DeoptimizationReason deoptReason,
      JavaConstant speculation,
      StructuredGraph graph) {
    if (deoptBegin.predecessor() instanceof AbstractBeginNode) {
      /* Walk up chains of LoopExitNodes to the "real" BeginNode that leads to deoptimization. */
      visitDeoptBegin(
          (AbstractBeginNode) deoptBegin.predecessor(),
          deoptAction,
          deoptReason,
          speculation,
          graph);
      return;
    }

    if (deoptBegin instanceof AbstractMergeNode) {
      AbstractMergeNode mergeNode = (AbstractMergeNode) deoptBegin;
      Debug.log("Visiting %s", mergeNode);
      FixedNode next = mergeNode.next();
      while (mergeNode.isAlive()) {
        AbstractEndNode end = mergeNode.forwardEnds().first();
        AbstractBeginNode newBeginNode = findBeginNode(end);
        visitDeoptBegin(newBeginNode, deoptAction, deoptReason, speculation, graph);
      }
      assert next.isAlive();
      AbstractBeginNode newBeginNode = findBeginNode(next);
      visitDeoptBegin(newBeginNode, deoptAction, deoptReason, speculation, graph);
      return;
    } else if (deoptBegin.predecessor() instanceof IfNode) {
      IfNode ifNode = (IfNode) deoptBegin.predecessor();
      AbstractBeginNode otherBegin = ifNode.trueSuccessor();
      LogicNode conditionNode = ifNode.condition();
      FixedGuardNode guard =
          graph.add(
              new FixedGuardNode(
                  conditionNode,
                  deoptReason,
                  deoptAction,
                  speculation,
                  deoptBegin == ifNode.trueSuccessor()));
      FixedWithNextNode pred = (FixedWithNextNode) ifNode.predecessor();
      AbstractBeginNode survivingSuccessor;
      if (deoptBegin == ifNode.trueSuccessor()) {
        survivingSuccessor = ifNode.falseSuccessor();
      } else {
        survivingSuccessor = ifNode.trueSuccessor();
      }
      graph.removeSplitPropagate(ifNode, survivingSuccessor);

      Node newGuard = guard;
      if (survivingSuccessor instanceof LoopExitNode) {
        newGuard = ProxyNode.forGuard(guard, (LoopExitNode) survivingSuccessor, graph);
      }
      survivingSuccessor.replaceAtUsages(InputType.Guard, newGuard);

      Debug.log(
          "Converting deopt on %-5s branch of %s to guard for remaining branch %s.",
          deoptBegin == ifNode.trueSuccessor() ? "true" : "false", ifNode, otherBegin);
      FixedNode next = pred.next();
      pred.setNext(guard);
      guard.setNext(next);
      survivingSuccessor.simplify(simplifierTool);
      return;
    }

    // We could not convert the control split - at least cut off control flow after the split.
    FixedWithNextNode deoptPred = deoptBegin;
    FixedNode next = deoptPred.next();

    if (!(next instanceof DeoptimizeNode)) {
      DeoptimizeNode newDeoptNode =
          graph.add(new DeoptimizeNode(deoptAction, deoptReason, speculation));
      deoptPred.setNext(newDeoptNode);
      assert deoptPred == newDeoptNode.predecessor();
      GraphUtil.killCFG(next);
    }
  }
Exemplo n.º 3
0
 private void setLastFixedNode(FixedWithNextNode n) {
   assert n.isAlive() : n;
   lastFixedNode = n;
 }