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 package org.graalvm.compiler.hotspot; 24 25 import static jdk.vm.ci.hotspot.HotSpotCompressedNullConstant.COMPRESSED_NULL; 26 27 import java.nio.ByteBuffer; 28 29 import org.graalvm.compiler.code.DataSection.Data; 30 import org.graalvm.compiler.code.DataSection.Patches; 31 import org.graalvm.compiler.code.DataSection.SerializableData; 32 import org.graalvm.compiler.code.DataSection.ZeroData; 33 import org.graalvm.compiler.debug.GraalError; 34 import org.graalvm.compiler.lir.asm.DataBuilder; 35 36 import jdk.vm.ci.code.TargetDescription; 37 import jdk.vm.ci.hotspot.HotSpotConstant; 38 import jdk.vm.ci.meta.Constant; 39 import jdk.vm.ci.meta.JavaConstant; 40 import jdk.vm.ci.meta.SerializableConstant; 41 import jdk.vm.ci.meta.VMConstant; 42 43 public class HotSpotDataBuilder extends DataBuilder { 44 45 private final TargetDescription target; 46 47 public HotSpotDataBuilder(TargetDescription target) { 48 this.target = target; 49 } 50 51 @Override 52 public boolean needDetailedPatchingInformation() { 53 /* The HotSpot VM finds operands that need patching by decoding the instruction. */ 54 return false; 55 } 56 57 @Override 58 public Data createDataItem(Constant constant) { 59 int size; 60 if (constant instanceof VMConstant) { 61 VMConstant vmConstant = (VMConstant) constant; 62 boolean compressed; 63 if (constant instanceof HotSpotConstant) { 64 HotSpotConstant c = (HotSpotConstant) vmConstant; 65 compressed = c.isCompressed(); 66 } else { 67 throw new GraalError(String.valueOf(constant)); 68 } 69 70 size = compressed ? 4 : target.wordSize; 71 if (size == 4) { 72 return new Data(size, size) { 73 74 @Override 75 protected void emit(ByteBuffer buffer, Patches patches) { 76 patches.registerPatch(vmConstant); 77 buffer.putInt(0xDEADDEAD); 78 } 79 }; 80 } else { 81 return new Data(size, size) { 82 83 @Override 84 protected void emit(ByteBuffer buffer, Patches patches) { 85 patches.registerPatch(vmConstant); 86 buffer.putLong(0xDEADDEADDEADDEADL); 87 } 88 }; 89 } 90 } else if (JavaConstant.isNull(constant)) { 91 boolean compressed = COMPRESSED_NULL.equals(constant); 92 size = compressed ? 4 : target.wordSize; 93 return ZeroData.create(size, size); 94 } else if (constant instanceof SerializableConstant) { 95 SerializableConstant s = (SerializableConstant) constant; 96 return new SerializableData(s); 97 } else { 98 throw new GraalError(String.valueOf(constant)); 99 } 100 } 101 }