1 /*
   2  * Copyright (c) 2014, 2014, 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.word;
  24 
  25 import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_0;
  26 import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_0;
  27 
  28 import org.graalvm.compiler.core.common.type.Stamp;
  29 import org.graalvm.compiler.graph.Node;
  30 import org.graalvm.compiler.graph.NodeClass;
  31 import org.graalvm.compiler.hotspot.word.HotSpotOperation.HotspotOpcode;
  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.LIRLowerable;
  36 import org.graalvm.compiler.nodes.spi.NodeLIRBuilderTool;
  37 
  38 import jdk.vm.ci.meta.Value;
  39 
  40 /**
  41  * Cast between Word and metaspace pointers exposed by the {@link HotspotOpcode#FROM_POINTER} and
  42  * {@link HotspotOpcode#TO_KLASS_POINTER} operations.
  43  */
  44 @NodeInfo(cycles = CYCLES_0, size = SIZE_0)
  45 public final class PointerCastNode extends FloatingNode implements LIRLowerable, Node.ValueNumberable {
  46 
  47     public static final NodeClass<PointerCastNode> TYPE = NodeClass.create(PointerCastNode.class);
  48     @Input ValueNode input;
  49 
  50     public PointerCastNode(Stamp stamp, ValueNode input) {
  51         super(TYPE, stamp);
  52         this.input = input;
  53     }
  54 
  55     public ValueNode getInput() {
  56         return input;
  57     }
  58 
  59     @Override
  60     public void generate(NodeLIRBuilderTool generator) {
  61         Value value = generator.operand(input);
  62         assert value.getValueKind().equals(generator.getLIRGeneratorTool().getLIRKind(stamp())) : "PointerCastNode shouldn't change the LIRKind";
  63 
  64         generator.setResult(this, value);
  65     }
  66 }