1 /* 2 * Copyright (c) 2016, 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 */ 23 24 package jdk.tools.jaotc; 25 26 import java.nio.ByteBuffer; 27 import java.nio.ByteOrder; 28 29 import jdk.tools.jaotc.binformat.BinaryContainer; 30 import jdk.tools.jaotc.binformat.Relocation; 31 import jdk.tools.jaotc.binformat.Relocation.RelocType; 32 import jdk.tools.jaotc.binformat.Symbol; 33 import jdk.tools.jaotc.binformat.Symbol.Binding; 34 import jdk.tools.jaotc.binformat.Symbol.Kind; 35 import jdk.tools.jaotc.AOTCompiledClass; 36 import org.graalvm.compiler.code.DataSection; 37 import org.graalvm.compiler.hotspot.meta.HotSpotConstantLoadAction; 38 39 import jdk.vm.ci.code.TargetDescription; 40 import jdk.vm.ci.code.site.ConstantReference; 41 import jdk.vm.ci.code.site.DataPatch; 42 import jdk.vm.ci.code.site.DataSectionReference; 43 import jdk.vm.ci.code.site.Reference; 44 import jdk.vm.ci.hotspot.HotSpotConstantPoolObject; 45 import jdk.vm.ci.hotspot.HotSpotMetaspaceConstant; 46 import jdk.vm.ci.hotspot.HotSpotObjectConstant; 47 import jdk.vm.ci.hotspot.HotSpotResolvedObjectType; 48 import jdk.vm.ci.hotspot.HotSpotSentinelConstant; 49 import jdk.vm.ci.meta.VMConstant; 50 51 final class DataPatchProcessor { 52 53 private final TargetDescription target; 54 55 private final BinaryContainer binaryContainer; 56 57 DataPatchProcessor(DataBuilder dataBuilder) { 58 this.target = dataBuilder.getBackend().getTarget(); 59 this.binaryContainer = dataBuilder.getBinaryContainer(); 60 } 61 62 /** 63 * Process a {@link DataPatch} generated by the compiler and create all needed binary section 64 * constructs. 65 */ 66 void process(CompiledMethodInfo methodInfo, DataPatch dataPatch) { 67 Reference reference = dataPatch.reference; 68 if (reference instanceof ConstantReference) { 69 processConstantReference(dataPatch, methodInfo); 70 } else if (reference instanceof DataSectionReference) { 71 processDataSectionReference(dataPatch, methodInfo); 72 } else { 73 throw new InternalError("Unknown data patch reference: " + reference); 74 } 75 } 76 77 private void processConstantReference(DataPatch dataPatch, CompiledMethodInfo methodInfo) { 78 HotSpotConstantLoadAction action = (HotSpotConstantLoadAction) dataPatch.note; 79 ConstantReference constantReference = (ConstantReference) dataPatch.reference; 80 assert action != null : "action should be set"; 81 82 VMConstant constant = constantReference.getConstant(); 83 String targetSymbol = null; 84 String gotName = null; 85 if (constant instanceof HotSpotMetaspaceConstant) { 86 HotSpotMetaspaceConstant metaspaceConstant = (HotSpotMetaspaceConstant) constant; 87 if (metaspaceConstant.asResolvedJavaType() != null) { 88 HotSpotResolvedObjectType type = metaspaceConstant.asResolvedJavaType(); 89 methodInfo.addDependentKlassData(binaryContainer, type); 90 targetSymbol = AOTCompiledClass.metadataName(type); 91 gotName = ((action == HotSpotConstantLoadAction.INITIALIZE) ? "got.init." : "got.") + targetSymbol; 92 } else if (metaspaceConstant.asResolvedJavaMethod() != null && action == HotSpotConstantLoadAction.LOAD_COUNTERS) { 93 targetSymbol = "counters." + JavaMethodInfo.uniqueMethodName(metaspaceConstant.asResolvedJavaMethod()); 94 gotName = "got." + targetSymbol; 95 binaryContainer.addCountersSymbol(targetSymbol); 96 } 97 } else if (constant instanceof HotSpotObjectConstant) { 98 HotSpotObjectConstant oopConstant = (HotSpotObjectConstant) constant; 99 if (oopConstant instanceof HotSpotConstantPoolObject) { 100 HotSpotConstantPoolObject cpo = (HotSpotConstantPoolObject)oopConstant; 101 // Even if two locations use the same object, resolve separately 102 targetSymbol = "ldc." + cpo.getCpType().getName() + cpo.getCpi(); 103 } else { 104 // String constant. 105 targetSymbol = "ldc." + oopConstant.toValueString(); 106 } 107 Integer offset = binaryContainer.addOopSymbol(targetSymbol); 108 gotName = "got.ldc." + offset; 109 } else if (constant instanceof HotSpotSentinelConstant) { 110 targetSymbol = "state.M" + methodInfo.getCodeId(); 111 gotName = "got." + targetSymbol; 112 } 113 114 assert gotName != null : "Unknown constant type: " + constant; 115 116 InstructionDecoder decoder = InstructionDecoder.getInstructionDecoder(target); 117 decoder.decodePosition(methodInfo.getCompilationResult().getTargetCode(), dataPatch.pcOffset); 118 int instructionEndOffset = decoder.currentEndOfInstruction(); 119 120 int textBaseOffset = methodInfo.getTextSectionOffset(); 121 int relocOffset = textBaseOffset + instructionEndOffset; 122 123 Symbol relocationSymbol = binaryContainer.getSymbol(gotName); 124 assert relocationSymbol != null : "symbol for " + gotName + " missing"; 125 Relocation reloc = new Relocation(relocOffset, RelocType.METASPACE_GOT_REFERENCE, 0, binaryContainer.getCodeContainer(), relocationSymbol); 126 binaryContainer.addRelocation(reloc); 127 } 128 129 private void processDataSectionReference(DataPatch dataPatch, CompiledMethodInfo methodInfo) { 130 DataSectionReference dataReference = (DataSectionReference) dataPatch.reference; 131 132 InstructionDecoder decoder = InstructionDecoder.getInstructionDecoder(target); 133 decoder.decodePosition(methodInfo.getCompilationResult().getTargetCode(), dataPatch.pcOffset); 134 int instructionEndOffset = decoder.currentEndOfInstruction(); 135 136 int textBaseOffset = methodInfo.getTextSectionOffset(); 137 int relocOffset = textBaseOffset + instructionEndOffset; 138 int dataOffset = dataReference.getOffset(); 139 140 DataSection dataSection = methodInfo.getCompilationResult().getDataSection(); 141 DataSection.Data data = dataSection.findData(dataReference); 142 int size = data.getSize(); 143 int alignment = data.getAlignment(); 144 byte[] value = new byte[size]; 145 ByteBuffer buffer = ByteBuffer.wrap(value).order(ByteOrder.nativeOrder()); 146 DataSection.emit(buffer, data, p -> { 147 }); 148 String targetSymbol = "data.M" + methodInfo.getCodeId() + "." + dataOffset; 149 Symbol relocationSymbol = binaryContainer.getSymbol(targetSymbol); 150 if (relocationSymbol == null) { 151 int symSize = Math.max(8, size); 152 int symAlig = Math.max(8, alignment); 153 int offsetInConstantDataSection = binaryContainer.addConstantData(value, symAlig); 154 relocationSymbol = binaryContainer.getConstantDataContainer().createSymbol(offsetInConstantDataSection, Kind.OBJECT, Binding.LOCAL, symSize, targetSymbol); 155 } 156 Relocation reloc = new Relocation(relocOffset, RelocType.METASPACE_GOT_REFERENCE, 0, binaryContainer.getCodeContainer(), relocationSymbol); 157 binaryContainer.addRelocation(reloc); 158 } 159 160 }