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