1 /*
   2  * Copyright (c) 2012, 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_2;
  26 import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_1;
  27 
  28 import org.graalvm.compiler.api.replacements.Snippet;
  29 import org.graalvm.compiler.core.common.LIRKind;
  30 import org.graalvm.compiler.core.common.type.StampFactory;
  31 import org.graalvm.compiler.graph.NodeClass;
  32 import org.graalvm.compiler.nodeinfo.NodeInfo;
  33 import org.graalvm.compiler.nodes.FixedWithNextNode;
  34 import org.graalvm.compiler.nodes.ValueNode;
  35 import org.graalvm.compiler.nodes.spi.LIRLowerable;
  36 import org.graalvm.compiler.nodes.spi.NodeLIRBuilderTool;
  37 
  38 import jdk.vm.ci.meta.AllocatableValue;
  39 import jdk.vm.ci.meta.JavaKind;
  40 
  41 /**
  42  * Intrinsification for getting the address of an object. The code path(s) between a call to
  43  * {@link #get(Object)} and all uses of the returned value must not contain safepoints. This can
  44  * only be guaranteed if used in a snippet that is instantiated after frame state assignment.
  45  * {@link ComputeObjectAddressNode} should generally be used in preference to this node.
  46  */
  47 @NodeInfo(cycles = CYCLES_2, size = SIZE_1)
  48 public final class GetObjectAddressNode extends FixedWithNextNode implements LIRLowerable {
  49     public static final NodeClass<GetObjectAddressNode> TYPE = NodeClass.create(GetObjectAddressNode.class);
  50 
  51     @Input ValueNode object;
  52 
  53     public GetObjectAddressNode(ValueNode obj) {
  54         super(TYPE, StampFactory.forKind(JavaKind.Long));
  55         this.object = obj;
  56     }
  57 
  58     @NodeIntrinsic
  59     public static native long get(Object array);
  60 
  61     @Override
  62     public void generate(NodeLIRBuilderTool gen) {
  63         AllocatableValue obj = gen.getLIRGeneratorTool().newVariable(LIRKind.unknownReference(gen.getLIRGeneratorTool().target().arch.getWordKind()));
  64         gen.getLIRGeneratorTool().emitMove(obj, gen.operand(object));
  65         gen.setResult(this, obj);
  66     }
  67 
  68     @Override
  69     public boolean verify() {
  70         assert graph().getGuardsStage().areFrameStatesAtDeopts() || graph().method().getAnnotation(Snippet.class) != null : "GetObjectAddressNode can't be used directly until frame states are fixed";
  71         return super.verify();
  72     }
  73 }