1/* 2 * Copyright (c) 2017, 2017, 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 */ 23package org.graalvm.compiler.hotspot.nodes; 24 25import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_2; 26import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_2; 27 28import org.graalvm.compiler.core.common.CompressEncoding; 29import org.graalvm.compiler.core.common.type.Stamp; 30import org.graalvm.compiler.debug.GraalError; 31import org.graalvm.compiler.graph.NodeClass; 32import org.graalvm.compiler.hotspot.nodes.type.HotSpotNarrowOopStamp; 33import org.graalvm.compiler.nodeinfo.NodeInfo; 34import org.graalvm.compiler.nodes.CompressionNode; 35import org.graalvm.compiler.nodes.ValueNode; 36 37import jdk.vm.ci.hotspot.HotSpotCompressedNullConstant; 38import jdk.vm.ci.hotspot.HotSpotConstant; 39import jdk.vm.ci.meta.Constant; 40import jdk.vm.ci.meta.JavaConstant; 41 42@NodeInfo(nameTemplate = "{p#op/s}", cycles = CYCLES_2, size = SIZE_2) 43public final class HotSpotCompressionNode extends CompressionNode { 44 45 public static final NodeClass<HotSpotCompressionNode> TYPE = NodeClass.create(HotSpotCompressionNode.class); 46 47 public HotSpotCompressionNode(CompressionOp op, ValueNode input, CompressEncoding encoding) { 48 super(TYPE, op, input, HotSpotNarrowOopStamp.mkStamp(op, input.stamp(), encoding), encoding); 49 } 50 51 public static HotSpotCompressionNode compress(ValueNode input, CompressEncoding encoding) { 52 return input.graph().unique(new HotSpotCompressionNode(CompressionOp.Compress, input, encoding)); 53 } 54 55 public static CompressionNode uncompress(ValueNode input, CompressEncoding encoding) { 56 return input.graph().unique(new HotSpotCompressionNode(CompressionOp.Uncompress, input, encoding)); 57 } 58 59 @Override 60 protected Constant compress(Constant c) { 61 if (JavaConstant.NULL_POINTER.equals(c)) { 62 return HotSpotCompressedNullConstant.COMPRESSED_NULL; 63 } else if (c instanceof HotSpotConstant) { 64 return ((HotSpotConstant) c).compress(); 65 } else { 66 throw GraalError.shouldNotReachHere("invalid constant input for compress op: " + c); 67 } 68 } 69 70 @Override 71 protected Constant uncompress(Constant c) { 72 if (c instanceof HotSpotConstant) { 73 return ((HotSpotConstant) c).uncompress(); 74 } else { 75 throw GraalError.shouldNotReachHere("invalid constant input for uncompress op: " + c); 76 } 77 } 78 79 @Override 80 protected Stamp mkStamp(Stamp input) { 81 return HotSpotNarrowOopStamp.mkStamp(op, input, encoding); 82 } 83} 84