1 /* 2 * Copyright (c) 2015, 2018, 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 25 package org.graalvm.compiler.hotspot; 26 27 import static jdk.vm.ci.hotspot.HotSpotCompressedNullConstant.COMPRESSED_NULL; 28 29 import java.nio.ByteBuffer; 30 31 import org.graalvm.compiler.code.DataSection.Data; 32 import org.graalvm.compiler.code.DataSection.Patches; 33 import org.graalvm.compiler.code.DataSection.SerializableData; 34 import org.graalvm.compiler.code.DataSection.ZeroData; 35 import org.graalvm.compiler.debug.GraalError; 36 import org.graalvm.compiler.lir.asm.DataBuilder; 37 38 import jdk.vm.ci.code.TargetDescription; 39 import jdk.vm.ci.hotspot.HotSpotConstant; 40 import jdk.vm.ci.meta.Constant; 41 import jdk.vm.ci.meta.JavaConstant; 42 import jdk.vm.ci.meta.SerializableConstant; 43 import jdk.vm.ci.meta.VMConstant; 44 45 public class HotSpotDataBuilder extends DataBuilder { 46 47 private final TargetDescription target; 48 49 public HotSpotDataBuilder(TargetDescription target) { 50 this.target = target; 51 } 52 53 @Override 54 public boolean needDetailedPatchingInformation() { 55 /* The HotSpot VM finds operands that need patching by decoding the instruction. */ 56 return false; 57 } 58 59 @Override 60 public Data createDataItem(Constant constant) { 61 if (JavaConstant.isNull(constant)) { 62 boolean compressed = COMPRESSED_NULL.equals(constant); 63 int size = compressed ? 4 : target.wordSize; 64 return ZeroData.create(size, size); 65 } else if (constant instanceof VMConstant) { 66 VMConstant vmConstant = (VMConstant) constant; 67 if (!(constant instanceof HotSpotConstant)) { 68 throw new GraalError(String.valueOf(constant)); 69 } 70 71 HotSpotConstant c = (HotSpotConstant) vmConstant; 72 int size = c.isCompressed() ? 4 : target.wordSize; 73 return new Data(size, size) { 74 @Override 75 protected void emit(ByteBuffer buffer, Patches patches) { 76 int position = buffer.position(); 77 if (getSize() == Integer.BYTES) { 78 buffer.putInt(0xDEADDEAD); 79 } else { 80 buffer.putLong(0xDEADDEADDEADDEADL); 81 } 82 patches.registerPatch(position, vmConstant); 83 } 84 }; 85 } else if (constant instanceof SerializableConstant) { 86 SerializableConstant s = (SerializableConstant) constant; 87 return new SerializableData(s); 88 } else { 89 throw new GraalError(String.valueOf(constant)); 90 } 91 } 92 }