1 /* 2 * Copyright (c) 2015, 2016, 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 package org.graalvm.compiler.hotspot.amd64; 25 26 import static org.graalvm.compiler.core.common.GraalOptions.GeneratePIC; 27 import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_0; 28 import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_0; 29 30 import org.graalvm.compiler.asm.NumUtil; 31 import org.graalvm.compiler.asm.amd64.AMD64Address.Scale; 32 import org.graalvm.compiler.core.amd64.AMD64AddressLowering; 33 import org.graalvm.compiler.core.amd64.AMD64AddressNode; 34 import org.graalvm.compiler.core.common.LIRKind; 35 import org.graalvm.compiler.core.common.type.ObjectStamp; 36 import org.graalvm.compiler.core.common.type.StampFactory; 37 import org.graalvm.compiler.graph.NodeClass; 38 import org.graalvm.compiler.hotspot.CompressEncoding; 39 import org.graalvm.compiler.hotspot.GraalHotSpotVMConfig; 40 import org.graalvm.compiler.hotspot.nodes.CompressionNode; 41 import org.graalvm.compiler.hotspot.nodes.CompressionNode.CompressionOp; 42 import org.graalvm.compiler.hotspot.nodes.GraalHotSpotVMConfigNode; 43 import org.graalvm.compiler.hotspot.nodes.type.KlassPointerStamp; 44 import org.graalvm.compiler.nodeinfo.NodeInfo; 45 import org.graalvm.compiler.nodes.ValueNode; 46 import org.graalvm.compiler.nodes.calc.FloatingNode; 47 import org.graalvm.compiler.nodes.spi.LIRLowerable; 48 import org.graalvm.compiler.nodes.spi.NodeLIRBuilderTool; 49 50 import jdk.vm.ci.code.Register; 51 import jdk.vm.ci.meta.JavaKind; 52 53 public class AMD64HotSpotAddressLowering extends AMD64AddressLowering { 54 55 private final long heapBase; 56 private final Register heapBaseRegister; 57 private final GraalHotSpotVMConfig config; 58 59 @NodeInfo(cycles = CYCLES_0, size = SIZE_0) 60 public static class HeapBaseNode extends FloatingNode implements LIRLowerable { 61 62 public static final NodeClass<HeapBaseNode> TYPE = NodeClass.create(HeapBaseNode.class); 63 64 private final Register heapBaseRegister; 65 66 public HeapBaseNode(Register heapBaseRegister) { 67 super(TYPE, StampFactory.pointer()); 68 this.heapBaseRegister = heapBaseRegister; 69 } 70 71 @Override 72 public void generate(NodeLIRBuilderTool generator) { 73 LIRKind kind = generator.getLIRGeneratorTool().getLIRKind(stamp()); 74 generator.setResult(this, heapBaseRegister.asValue(kind)); 75 } 76 } 77 78 public AMD64HotSpotAddressLowering(GraalHotSpotVMConfig config, Register heapBaseRegister) { 79 this.heapBase = config.getOopEncoding().base; 80 this.config = config; 81 if (heapBase == 0 && !GeneratePIC.getValue()) { 82 this.heapBaseRegister = null; 83 } else { 84 this.heapBaseRegister = heapBaseRegister; 85 } 86 } 87 88 @Override 89 protected boolean improve(AMD64AddressNode addr) { 90 if (addr.getScale() == Scale.Times1) { 91 if (addr.getBase() == null && addr.getIndex() instanceof CompressionNode) { 92 if (improveUncompression(addr, (CompressionNode) addr.getIndex())) { 93 return true; 94 } 95 } 96 97 if (addr.getIndex() == null && addr.getBase() instanceof CompressionNode) { 98 if (improveUncompression(addr, (CompressionNode) addr.getBase())) { 99 return true; 100 } 101 } 102 } 103 104 return super.improve(addr); 105 } 106 107 private boolean improveUncompression(AMD64AddressNode addr, CompressionNode compression) { 108 if (compression.getOp() == CompressionOp.Uncompress) { 109 CompressEncoding encoding = compression.getEncoding(); 110 Scale scale = Scale.fromShift(encoding.shift); 111 if (scale == null) { 112 return false; 113 } 114 115 if (heapBaseRegister != null && encoding.base == heapBase) { 116 if (!GeneratePIC.getValue() || compression.stamp() instanceof ObjectStamp) { 117 // With PIC it is only legal to do for oops since the base value may be 118 // different at runtime. 119 ValueNode base = compression.graph().unique(new HeapBaseNode(heapBaseRegister)); 120 addr.setBase(base); 121 } else { 122 return false; 123 } 124 } else if (encoding.base != 0 || (GeneratePIC.getValue() && compression.stamp() instanceof KlassPointerStamp)) { 125 if (GeneratePIC.getValue()) { 126 ValueNode base = compression.graph().unique(new GraalHotSpotVMConfigNode(config, config.MARKID_NARROW_KLASS_BASE_ADDRESS, JavaKind.Long)); 127 addr.setBase(base); 128 } else { 129 long disp = addr.getDisplacement() + encoding.base; 130 if (NumUtil.isInt(disp)) { 131 addr.setDisplacement((int) disp); 132 addr.setBase(null); 133 } else { 134 return false; 135 } 136 } 137 } else { 138 addr.setBase(null); 139 } 140 141 addr.setScale(scale); 142 addr.setIndex(compression.getValue()); 143 return true; 144 } else { 145 return false; 146 } 147 } 148 }