예제 #1
0
 /**
  * For one or more `invoke` arguments, flow-sensitive information may suggest their narrowing or
  * simplification. In those cases, a new {@link com.oracle.graal.nodes.java.MethodCallTargetNode
  * MethodCallTargetNode} is prepared just for this callsite, consuming reduced arguments.
  *
  * <p>Specializing the {@link com.oracle.graal.nodes.java.MethodCallTargetNode
  * MethodCallTargetNode} as described above may enable two optimizations:
  *
  * <ul>
  *   <li>devirtualization of an {@link com.oracle.graal.nodes.CallTargetNode.InvokeKind#Interface}
  *       or {@link com.oracle.graal.nodes.CallTargetNode.InvokeKind#Virtual} callsite
  *       (devirtualization made possible after narrowing the type of the receiver)
  *   <li>(future work) actual-argument-aware inlining, ie, to specialize callees on the types of
  *       arguments other than the receiver (examples: multi-methods, the inlining problem, lambdas
  *       as arguments).
  * </ul>
  *
  * <p>Precondition: inputs haven't been deverbosified yet.
  */
 private void visitInvoke(Invoke invoke) {
   if (invoke.asNode().stamp() instanceof IllegalStamp) {
     return; // just to be safe
   }
   boolean isMethodCallTarget = invoke.callTarget() instanceof MethodCallTargetNode;
   if (!isMethodCallTarget) {
     return;
   }
   FlowUtil.replaceInPlace(
       invoke.asNode(),
       invoke.callTarget(),
       deverbosifyInputsCopyOnWrite((MethodCallTargetNode) invoke.callTarget()));
   MethodCallTargetNode callTarget = (MethodCallTargetNode) invoke.callTarget();
   if (callTarget.invokeKind() != CallTargetNode.InvokeKind.Interface
       && callTarget.invokeKind() != CallTargetNode.InvokeKind.Virtual) {
     return;
   }
   ValueNode receiver = callTarget.receiver();
   if (receiver == null) {
     return;
   }
   if (!FlowUtil.hasLegalObjectStamp(receiver)) {
     return;
   }
   Witness w = state.typeInfo(receiver);
   ResolvedJavaType type;
   ResolvedJavaType stampType = StampTool.typeOrNull(receiver);
   if (w == null || w.cluelessAboutType()) {
     // can't improve on stamp but wil try to devirtualize anyway
     type = stampType;
   } else {
     type = FlowUtil.tighten(w.type(), stampType);
   }
   if (type == null) {
     return;
   }
   ResolvedJavaMethod method =
       type.resolveMethod(callTarget.targetMethod(), invoke.getContextType());
   if (method == null) {
     return;
   }
   if (method.canBeStaticallyBound() || Modifier.isFinal(type.getModifiers())) {
     metricMethodResolved.increment();
     callTarget.setInvokeKind(CallTargetNode.InvokeKind.Special);
     callTarget.setTargetMethod(method);
   }
 }
예제 #2
0
  /**
   * Gets an approximate source code location for a node if possible.
   *
   * @return the StackTraceElements if an approximate source location is found, null otherwise
   */
  public static StackTraceElement[] approxSourceStackTraceElement(Node node) {
    ArrayList<StackTraceElement> elements = new ArrayList<>();
    Node n = node;
    while (n != null) {
      if (n instanceof MethodCallTargetNode) {
        elements.add(((MethodCallTargetNode) n).targetMethod().asStackTraceElement(-1));
        n = ((MethodCallTargetNode) n).invoke().asNode();
      }

      if (n instanceof StateSplit) {
        FrameState state = ((StateSplit) n).stateAfter();
        while (state != null) {
          ResolvedJavaMethod method = state.method();
          if (method != null) {
            elements.add(method.asStackTraceElement(state.bci - 1));
          }
          state = state.outerFrameState();
        }
        break;
      }
      n = n.predecessor();
    }
    return elements.toArray(new StackTraceElement[elements.size()]);
  }