1 /*
2 * Copyright (c) 2007, 2020, 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. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package com.sun.tools.classfile;
27
28 import java.io.IOException;
29 import java.lang.reflect.Constructor;
30 import java.util.HashMap;
31 import java.util.Map;
32
33 /**
34 * <p><b>This is NOT part of any supported API.
35 * If you write code that depends on this, you do so at your own risk.
36 * This code and its internal interfaces are subject to change or
37 * deletion without notice.</b>
38 */
39
40 public abstract class Attribute {
41 public static final String AnnotationDefault = "AnnotationDefault";
42 public static final String BootstrapMethods = "BootstrapMethods";
43 public static final String CharacterRangeTable = "CharacterRangeTable";
44 public static final String Code = "Code";
45 public static final String ConstantValue = "ConstantValue";
46 public static final String CompilationID = "CompilationID";
47 public static final String Deprecated = "Deprecated";
48 public static final String EnclosingMethod = "EnclosingMethod";
49 public static final String Exceptions = "Exceptions";
50 public static final String InnerClasses = "InnerClasses";
51 public static final String LineNumberTable = "LineNumberTable";
52 public static final String LocalVariableTable = "LocalVariableTable";
53 public static final String LocalVariableTypeTable = "LocalVariableTypeTable";
54 public static final String MethodParameters = "MethodParameters";
55 public static final String Module = "Module";
56 public static final String ModuleHashes = "ModuleHashes";
57 public static final String ModuleMainClass = "ModuleMainClass";
58 public static final String ModulePackages = "ModulePackages";
59 public static final String ModuleResolution = "ModuleResolution";
60 public static final String ModuleTarget = "ModuleTarget";
61 public static final String NestHost = "NestHost";
62 public static final String NestMembers = "NestMembers";
63 public static final String Preload = "Preload";
64 public static final String Record = "Record";
65 public static final String RuntimeVisibleAnnotations = "RuntimeVisibleAnnotations";
66 public static final String RuntimeInvisibleAnnotations = "RuntimeInvisibleAnnotations";
67 public static final String RuntimeVisibleParameterAnnotations = "RuntimeVisibleParameterAnnotations";
68 public static final String RuntimeInvisibleParameterAnnotations = "RuntimeInvisibleParameterAnnotations";
69 public static final String RuntimeVisibleTypeAnnotations = "RuntimeVisibleTypeAnnotations";
70 public static final String RuntimeInvisibleTypeAnnotations = "RuntimeInvisibleTypeAnnotations";
71 public static final String PermittedSubclasses = "PermittedSubclasses";
72 public static final String Signature = "Signature";
73 public static final String SourceDebugExtension = "SourceDebugExtension";
74 public static final String SourceFile = "SourceFile";
75 public static final String SourceID = "SourceID";
76 public static final String StackMap = "StackMap";
77 public static final String StackMapTable = "StackMapTable";
78 public static final String Synthetic = "Synthetic";
79
80 public static class Factory {
81 public Factory() {
82 // defer init of standardAttributeClasses until after options set up
83 }
84
85 public Attribute createAttribute(ClassReader cr, int name_index, byte[] data)
86 throws IOException {
87 if (standardAttributes == null) {
88 init();
89 }
90
91 ConstantPool cp = cr.getConstantPool();
92 String reasonForDefaultAttr;
93 try {
94 String name = cp.getUTF8Value(name_index);
95 Class<? extends Attribute> attrClass = standardAttributes.get(name);
96 if (attrClass != null) {
97 try {
98 Class<?>[] constrArgTypes = {ClassReader.class, int.class, int.class};
99 Constructor<? extends Attribute> constr = attrClass.getDeclaredConstructor(constrArgTypes);
100 return constr.newInstance(cr, name_index, data.length);
101 } catch (Throwable t) {
102 reasonForDefaultAttr = t.toString();
103 // fall through and use DefaultAttribute
104 // t.printStackTrace();
105 }
106 } else {
107 reasonForDefaultAttr = "unknown attribute";
108 }
109 } catch (ConstantPoolException e) {
110 reasonForDefaultAttr = e.toString();
111 // fall through and use DefaultAttribute
112 }
113 return new DefaultAttribute(cr, name_index, data, reasonForDefaultAttr);
114 }
115
116 protected void init() {
117 standardAttributes = new HashMap<>();
118 standardAttributes.put(AnnotationDefault, AnnotationDefault_attribute.class);
119 standardAttributes.put(BootstrapMethods, BootstrapMethods_attribute.class);
120 standardAttributes.put(CharacterRangeTable, CharacterRangeTable_attribute.class);
121 standardAttributes.put(Code, Code_attribute.class);
122 standardAttributes.put(CompilationID, CompilationID_attribute.class);
123 standardAttributes.put(ConstantValue, ConstantValue_attribute.class);
124 standardAttributes.put(Deprecated, Deprecated_attribute.class);
125 standardAttributes.put(EnclosingMethod, EnclosingMethod_attribute.class);
126 standardAttributes.put(Exceptions, Exceptions_attribute.class);
127 standardAttributes.put(InnerClasses, InnerClasses_attribute.class);
128 standardAttributes.put(LineNumberTable, LineNumberTable_attribute.class);
129 standardAttributes.put(LocalVariableTable, LocalVariableTable_attribute.class);
130 standardAttributes.put(LocalVariableTypeTable, LocalVariableTypeTable_attribute.class);
131 standardAttributes.put(MethodParameters, MethodParameters_attribute.class);
132 standardAttributes.put(Module, Module_attribute.class);
133 standardAttributes.put(ModuleHashes, ModuleHashes_attribute.class);
134 standardAttributes.put(ModuleMainClass, ModuleMainClass_attribute.class);
135 standardAttributes.put(ModulePackages, ModulePackages_attribute.class);
136 standardAttributes.put(ModuleResolution, ModuleResolution_attribute.class);
137 standardAttributes.put(ModuleTarget, ModuleTarget_attribute.class);
138 standardAttributes.put(NestHost, NestHost_attribute.class);
139 standardAttributes.put(NestMembers, NestMembers_attribute.class);
140 standardAttributes.put(Preload, Preload_attribute.class);
141 standardAttributes.put(Record, Record_attribute.class);
142 standardAttributes.put(RuntimeInvisibleAnnotations, RuntimeInvisibleAnnotations_attribute.class);
143 standardAttributes.put(RuntimeInvisibleParameterAnnotations, RuntimeInvisibleParameterAnnotations_attribute.class);
144 standardAttributes.put(RuntimeVisibleAnnotations, RuntimeVisibleAnnotations_attribute.class);
145 standardAttributes.put(RuntimeVisibleParameterAnnotations, RuntimeVisibleParameterAnnotations_attribute.class);
146 standardAttributes.put(RuntimeVisibleTypeAnnotations, RuntimeVisibleTypeAnnotations_attribute.class);
147 standardAttributes.put(RuntimeInvisibleTypeAnnotations, RuntimeInvisibleTypeAnnotations_attribute.class);
148 standardAttributes.put(PermittedSubclasses, PermittedSubclasses_attribute.class);
149 standardAttributes.put(Signature, Signature_attribute.class);
150 standardAttributes.put(SourceDebugExtension, SourceDebugExtension_attribute.class);
151 standardAttributes.put(SourceFile, SourceFile_attribute.class);
152 standardAttributes.put(SourceID, SourceID_attribute.class);
153 standardAttributes.put(StackMap, StackMap_attribute.class);
154 standardAttributes.put(StackMapTable, StackMapTable_attribute.class);
155 standardAttributes.put(Synthetic, Synthetic_attribute.class);
156 }
157
158 private Map<String,Class<? extends Attribute>> standardAttributes;
159 }
160
161 public static Attribute read(ClassReader cr) throws IOException {
162 return cr.readAttribute();
163 }
164
165 protected Attribute(int name_index, int length) {
166 attribute_name_index = name_index;
167 attribute_length = length;
168 }
169
170 public String getName(ConstantPool constant_pool) throws ConstantPoolException {
171 return constant_pool.getUTF8Value(attribute_name_index);
172 }
173
174 public abstract <R,D> R accept(Attribute.Visitor<R,D> visitor, D data);
175
176 public int byteLength() {
177 return 6 + attribute_length;
178 }
179
180 public final int attribute_name_index;
181 public final int attribute_length;
182
183
184 public interface Visitor<R,P> {
185 R visitBootstrapMethods(BootstrapMethods_attribute attr, P p);
186 R visitDefault(DefaultAttribute attr, P p);
187 R visitAnnotationDefault(AnnotationDefault_attribute attr, P p);
188 R visitCharacterRangeTable(CharacterRangeTable_attribute attr, P p);
189 R visitCode(Code_attribute attr, P p);
190 R visitCompilationID(CompilationID_attribute attr, P p);
191 R visitConstantValue(ConstantValue_attribute attr, P p);
192 R visitDeprecated(Deprecated_attribute attr, P p);
193 R visitEnclosingMethod(EnclosingMethod_attribute attr, P p);
194 R visitExceptions(Exceptions_attribute attr, P p);
195 R visitInnerClasses(InnerClasses_attribute attr, P p);
196 R visitLineNumberTable(LineNumberTable_attribute attr, P p);
197 R visitLocalVariableTable(LocalVariableTable_attribute attr, P p);
198 R visitLocalVariableTypeTable(LocalVariableTypeTable_attribute attr, P p);
199 R visitMethodParameters(MethodParameters_attribute attr, P p);
200 R visitModule(Module_attribute attr, P p);
201 R visitModuleHashes(ModuleHashes_attribute attr, P p);
202 R visitModuleMainClass(ModuleMainClass_attribute attr, P p);
203 R visitModulePackages(ModulePackages_attribute attr, P p);
204 R visitModuleResolution(ModuleResolution_attribute attr, P p);
205 R visitModuleTarget(ModuleTarget_attribute attr, P p);
206 R visitNestHost(NestHost_attribute attr, P p);
207 R visitNestMembers(NestMembers_attribute attr, P p);
208 R visitPreload(Preload_attribute attr, P p);
209 R visitRecord(Record_attribute attr, P p);
210 R visitRuntimeVisibleAnnotations(RuntimeVisibleAnnotations_attribute attr, P p);
211 R visitRuntimeInvisibleAnnotations(RuntimeInvisibleAnnotations_attribute attr, P p);
212 R visitRuntimeVisibleParameterAnnotations(RuntimeVisibleParameterAnnotations_attribute attr, P p);
213 R visitRuntimeInvisibleParameterAnnotations(RuntimeInvisibleParameterAnnotations_attribute attr, P p);
214 R visitRuntimeVisibleTypeAnnotations(RuntimeVisibleTypeAnnotations_attribute attr, P p);
215 R visitRuntimeInvisibleTypeAnnotations(RuntimeInvisibleTypeAnnotations_attribute attr, P p);
216 R visitPermittedSubclasses(PermittedSubclasses_attribute attr, P p);
217 R visitSignature(Signature_attribute attr, P p);
218 R visitSourceDebugExtension(SourceDebugExtension_attribute attr, P p);
219 R visitSourceFile(SourceFile_attribute attr, P p);
220 R visitSourceID(SourceID_attribute attr, P p);
221 R visitStackMap(StackMap_attribute attr, P p);
222 R visitStackMapTable(StackMapTable_attribute attr, P p);
223 R visitSynthetic(Synthetic_attribute attr, P p);
224 }
225 }