1 /*
   2  * Copyright (c) 2016, 2018, 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 
  24 
  25 package org.graalvm.compiler.hotspot.nodes.aot;
  26 
  27 import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_4;
  28 import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_1;
  29 
  30 import org.graalvm.compiler.core.common.PermanentBailoutException;
  31 import org.graalvm.compiler.graph.Node;
  32 import org.graalvm.compiler.graph.NodeClass;
  33 import org.graalvm.compiler.graph.spi.Canonicalizable;
  34 import org.graalvm.compiler.graph.spi.CanonicalizerTool;
  35 import org.graalvm.compiler.hotspot.HotSpotLIRGenerator;
  36 import org.graalvm.compiler.hotspot.meta.HotSpotConstantLoadAction;
  37 import org.graalvm.compiler.hotspot.word.KlassPointer;
  38 import org.graalvm.compiler.nodeinfo.NodeInfo;
  39 import org.graalvm.compiler.nodes.NodeView;
  40 import org.graalvm.compiler.nodes.ValueNode;
  41 import org.graalvm.compiler.nodes.calc.FloatingNode;
  42 import org.graalvm.compiler.nodes.spi.LIRLowerable;
  43 import org.graalvm.compiler.nodes.spi.NodeLIRBuilderTool;
  44 import org.graalvm.compiler.nodes.util.GraphUtil;
  45 
  46 import jdk.vm.ci.hotspot.HotSpotMetaspaceConstant;
  47 import jdk.vm.ci.hotspot.HotSpotObjectConstant;
  48 import jdk.vm.ci.meta.Constant;
  49 import jdk.vm.ci.meta.Value;
  50 
  51 @NodeInfo(cycles = CYCLES_4, size = SIZE_1)
  52 public class LoadConstantIndirectlyNode extends FloatingNode implements Canonicalizable, LIRLowerable {
  53 
  54     public static final NodeClass<LoadConstantIndirectlyNode> TYPE = NodeClass.create(LoadConstantIndirectlyNode.class);
  55 
  56     @OptionalInput protected ValueNode value;
  57     protected Constant constant;
  58     protected HotSpotConstantLoadAction action;
  59 
  60     public LoadConstantIndirectlyNode(ValueNode value) {
  61         super(TYPE, value.stamp(NodeView.DEFAULT));
  62         this.value = value;
  63         this.constant = null;
  64         this.action = HotSpotConstantLoadAction.RESOLVE;
  65     }
  66 
  67     public LoadConstantIndirectlyNode(ValueNode value, HotSpotConstantLoadAction action) {
  68         super(TYPE, value.stamp(NodeView.DEFAULT));
  69         this.value = value;
  70         this.constant = null;
  71         this.action = action;
  72     }
  73 
  74     @Override
  75     public Node canonical(CanonicalizerTool tool) {
  76         if (value != null) {
  77             constant = GraphUtil.foldIfConstantAndRemove(this, value);
  78         }
  79         return this;
  80     }
  81 
  82     @Override
  83     public void generate(NodeLIRBuilderTool gen) {
  84         assert constant != null : "Expected the value to fold: " + value;
  85         Value result;
  86         if (constant instanceof HotSpotObjectConstant) {
  87             result = ((HotSpotLIRGenerator) gen.getLIRGeneratorTool()).emitLoadObjectAddress(constant);
  88         } else if (constant instanceof HotSpotMetaspaceConstant) {
  89             result = ((HotSpotLIRGenerator) gen.getLIRGeneratorTool()).emitLoadMetaspaceAddress(constant, action);
  90         } else {
  91             throw new PermanentBailoutException("Unsupported constant type: " + constant);
  92         }
  93         gen.setResult(this, result);
  94     }
  95 
  96     @NodeIntrinsic
  97     public static native KlassPointer loadKlass(KlassPointer klassPointer, @ConstantNodeParameter HotSpotConstantLoadAction action);
  98 
  99     @NodeIntrinsic
 100     public static native KlassPointer loadKlass(KlassPointer klassPointer);
 101 
 102     @NodeIntrinsic
 103     public static native Object loadObject(Object object);
 104 
 105 }