1 /*
   2  * Copyright (c) 2009, 2011, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 package org.graalvm.compiler.nodes.virtual;
  24 
  25 import static org.graalvm.compiler.nodeinfo.InputType.Extension;
  26 import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_0;
  27 import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_0;
  28 
  29 import org.graalvm.compiler.core.common.type.StampFactory;
  30 import org.graalvm.compiler.core.common.type.TypeReference;
  31 import org.graalvm.compiler.graph.NodeClass;
  32 import org.graalvm.compiler.nodeinfo.NodeInfo;
  33 import org.graalvm.compiler.nodes.ValueNode;
  34 import org.graalvm.compiler.nodes.calc.FloatingNode;
  35 import org.graalvm.compiler.nodes.spi.ArrayLengthProvider;
  36 import org.graalvm.compiler.nodes.spi.Virtualizable;
  37 import org.graalvm.compiler.nodes.spi.VirtualizerTool;
  38 
  39 /**
  40  * Selects one object from a {@link CommitAllocationNode}. The object is identified by its
  41  * {@link VirtualObjectNode}.
  42  */
  43 @NodeInfo(cycles = CYCLES_0, size = SIZE_0)
  44 public final class AllocatedObjectNode extends FloatingNode implements Virtualizable, ArrayLengthProvider {
  45 
  46     public static final NodeClass<AllocatedObjectNode> TYPE = NodeClass.create(AllocatedObjectNode.class);
  47     @Input VirtualObjectNode virtualObject;
  48     @Input(Extension) CommitAllocationNode commit;
  49 
  50     public AllocatedObjectNode(VirtualObjectNode virtualObject) {
  51         super(TYPE, StampFactory.objectNonNull(TypeReference.createExactTrusted(virtualObject.type())));
  52         this.virtualObject = virtualObject;
  53     }
  54 
  55     public VirtualObjectNode getVirtualObject() {
  56         return virtualObject;
  57     }
  58 
  59     public CommitAllocationNode getCommit() {
  60         return commit;
  61     }
  62 
  63     public void setCommit(CommitAllocationNode x) {
  64         updateUsages(commit, x);
  65         commit = x;
  66     }
  67 
  68     @Override
  69     public void virtualize(VirtualizerTool tool) {
  70         tool.replaceWithVirtual(getVirtualObject());
  71     }
  72 
  73     @Override
  74     public ValueNode length() {
  75         if (virtualObject instanceof ArrayLengthProvider) {
  76             return ((ArrayLengthProvider) virtualObject).length();
  77         }
  78         return null;
  79     }
  80 }