1 /*
   2  * Copyright (c) 2015, 2015, 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.hotspot.nodes;
  24 
  25 import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_3;
  26 import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_2;
  27 
  28 import org.graalvm.compiler.core.common.type.StampFactory;
  29 import org.graalvm.compiler.graph.NodeClass;
  30 import org.graalvm.compiler.nodeinfo.NodeInfo;
  31 import org.graalvm.compiler.nodes.FixedWithNextNode;
  32 import org.graalvm.compiler.nodes.ValueNode;
  33 import org.graalvm.compiler.nodes.debug.ControlFlowAnchored;
  34 import org.graalvm.compiler.nodes.spi.Lowerable;
  35 import org.graalvm.compiler.nodes.spi.LoweringTool;
  36 
  37 import jdk.vm.ci.meta.JavaKind;
  38 
  39 /**
  40  * A high-level intrinsic for getting an address inside of an object. During lowering it will be
  41  * moved next to any uses to avoid creating a derived pointer that is live across a safepoint.
  42  */
  43 @NodeInfo(cycles = CYCLES_3, size = SIZE_2)
  44 public final class ComputeObjectAddressNode extends FixedWithNextNode implements Lowerable, ControlFlowAnchored {
  45     public static final NodeClass<ComputeObjectAddressNode> TYPE = NodeClass.create(ComputeObjectAddressNode.class);
  46 
  47     @Input ValueNode object;
  48     @Input ValueNode offset;
  49 
  50     public ComputeObjectAddressNode(ValueNode obj, ValueNode offset) {
  51         super(TYPE, StampFactory.forKind(JavaKind.Long));
  52         this.object = obj;
  53         this.offset = offset;
  54     }
  55 
  56     @NodeIntrinsic
  57     public static native long get(Object array, long offset);
  58 
  59     @Override
  60     public void lower(LoweringTool tool) {
  61         tool.getLowerer().lower(this, tool);
  62     }
  63 
  64     public ValueNode getObject() {
  65         return object;
  66     }
  67 
  68     public ValueNode getOffset() {
  69         return offset;
  70     }
  71 }