1 /* 2 * Copyright (c) 2009, 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.replacements.nodes; 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.api.replacements.Snippet.VarargsParameter; 29 import org.graalvm.compiler.core.common.type.Stamp; 30 import org.graalvm.compiler.graph.Node; 31 import org.graalvm.compiler.graph.NodeClass; 32 import org.graalvm.compiler.graph.NodeInputList; 33 import org.graalvm.compiler.graph.spi.Canonicalizable; 34 import org.graalvm.compiler.graph.spi.CanonicalizerTool; 35 import org.graalvm.compiler.nodeinfo.NodeInfo; 36 import org.graalvm.compiler.nodes.FixedWithNextNode; 37 import org.graalvm.compiler.nodes.ParameterNode; 38 import org.graalvm.compiler.nodes.ValueNode; 39 40 /** 41 * Implements the semantics of {@link VarargsParameter}. 42 */ 43 @NodeInfo(cycles = CYCLES_0, size = SIZE_0) 44 public final class LoadSnippetVarargParameterNode extends FixedWithNextNode implements Canonicalizable { 45 46 public static final NodeClass<LoadSnippetVarargParameterNode> TYPE = NodeClass.create(LoadSnippetVarargParameterNode.class); 47 @Input ValueNode index; 48 49 @Input NodeInputList<ParameterNode> parameters; 50 51 public LoadSnippetVarargParameterNode(ParameterNode[] locals, ValueNode index, Stamp stamp) { 52 super(TYPE, stamp); 53 this.index = index; 54 this.parameters = new NodeInputList<>(this, locals); 55 } 56 57 @Override 58 public Node canonical(CanonicalizerTool tool) { 59 if (index.isConstant()) { 60 int indexValue = index.asJavaConstant().asInt(); 61 if (indexValue < parameters.size()) { 62 return parameters.get(indexValue); 63 } 64 } 65 return this; 66 } 67 }