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