1 /*
2 * Copyright (c) 2002, 2023, 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.javac.jvm;
27
28 import java.util.*;
29
30 import com.sun.tools.javac.code.Flags;
31 import com.sun.tools.javac.code.Symbol;
32 import com.sun.tools.javac.util.*;
33
34 import static com.sun.tools.javac.main.Option.TARGET;
35
36 /** The classfile version target.
37 *
38 * <p><b>This is NOT part of any supported API.
39 * If you write code that depends on this, you do so at your own risk.
40 * This code and its internal interfaces are subject to change or
41 * deletion without notice.</b>
42 */
43 public enum Target {
44 JDK1_1("1.1", 45, 3),
45 JDK1_2("1.2", 46, 0),
46 JDK1_3("1.3", 47, 0),
47
48 /** J2SE1.4 = Merlin. */
49 JDK1_4("1.4", 48, 0),
50
51 /** JDK 5, codename Tiger. */
52 JDK1_5("5", 49, 0),
53
54 /** JDK 6. */
55 JDK1_6("6", 50, 0),
56
57 /** JDK 7. */
58 JDK1_7("7", 51, 0),
59
60 /** JDK 8. */
61 JDK1_8("8", 52, 0),
62
63 /** JDK 9. */
64 JDK1_9("9", 53, 0),
65
66 /** JDK 10. */
67 JDK1_10("10", 54, 0),
68
69 /** JDK 11. */
70 JDK1_11("11", 55, 0),
71
72 /** JDK 12. */
73 JDK1_12("12", 56, 0),
74
75 /** JDK 13. */
76 JDK1_13("13", 57, 0),
77
78 /** JDK 14. */
79 JDK1_14("14", 58, 0),
80
81 /** JDK 15. */
82 JDK1_15("15", 59, 0),
83
84 /** JDK 16. */
85 JDK1_16("16", 60, 0),
86
87 /** JDK 17. */
88 JDK1_17("17", 61, 0),
89
90 /** JDK 18. */
91 JDK1_18("18", 62, 0),
92
93 /** JDK 19. */
94 JDK1_19("19", 63, 0),
95
96 /** JDK 20. */
97 JDK1_20("20", 64, 0),
98
99 /** JDK 21. */
100 JDK1_21("21", 65, 0),
101
102 /** JDK 22. */
103 JDK1_22("22", 66, 0),
104
105 /** JDK 23. */
106 JDK1_23("23", 67, 0),
107 ; // Reduce code churn when appending new constants
108
109 private static final Context.Key<Target> targetKey = new Context.Key<>();
110
111 public static Target instance(Context context) {
112 Target instance = context.get(targetKey);
113 if (instance == null) {
114 Options options = Options.instance(context);
115 String targetString = options.get(TARGET);
116 if (targetString != null) instance = lookup(targetString);
117 if (instance == null) instance = DEFAULT;
118 context.put(targetKey, instance);
119 }
120 return instance;
121 }
122
123 public static final Target MIN = Target.JDK1_8;
124
125 private static final Target MAX = values()[values().length - 1];
126
127 public static final Target DEFAULT = MAX;
128
129 private static final Map<String,Target> tab = new HashMap<>();
130 static {
131 for (Target t : values()) {
132 tab.put(t.name, t);
133 }
134 tab.put("1.5", JDK1_5);
135 tab.put("1.6", JDK1_6);
136 tab.put("1.7", JDK1_7);
137 tab.put("1.8", JDK1_8);
138 tab.put("1.9", JDK1_9);
139 tab.put("1.10", JDK1_10);
140 }
141
142 public final String name;
143 public final int majorVersion;
144 public final int minorVersion;
145 private Target(String name, int majorVersion, int minorVersion) {
146 this.name = name;
147 this.majorVersion = majorVersion;
148 this.minorVersion = minorVersion;
149 }
150
151 public static Target lookup(String name) {
152 return tab.get(name);
153 }
154
155 public boolean isSupported() {
156 return this.compareTo(MIN) >= 0;
157 }
158
159 /** Return the character to be used in constructing synthetic
160 * identifiers, where not specified by the JLS.
161 */
162 public char syntheticNameChar() {
163 return '$';
164 }
165
166 /** Does the target VM expect MethodParameters attributes?
167 */
168 public boolean hasMethodParameters() {
169 return compareTo(JDK1_8) >= 0;
170 }
171
172 /** Does the target JDK contain StringConcatFactory class?
173 */
174 public boolean hasStringConcatFactory() {
175 return compareTo(JDK1_9) >= 0;
176 }
177
178 /** Value of platform release used to access multi-release jar files
179 */
180 public String multiReleaseValue() {
181 return Integer.toString(this.ordinal() - Target.JDK1_1.ordinal() + 1);
182 }
183
184 /** All modules that export an API are roots when compiling code in the unnamed
185 * module and targeting 11 or newer.
186 */
187 public boolean allApiModulesAreRoots() {
188 return compareTo(JDK1_11) >= 0;
189 }
190
191 /** Does the target VM support nestmate access?
192 */
193 public boolean hasNestmateAccess() {
194 return compareTo(JDK1_11) >= 0;
195 }
196
197 /** language runtime uses nest-based access.
198 * e.g. lambda and string concat spin dynamic proxy class as a nestmate
199 * of the target class
200 */
201 public boolean runtimeUseNestAccess() {
202 return compareTo(JDK1_15) >= 0;
203 }
204
205 /** Does the target VM support virtual private invocations?
206 */
207 public boolean hasVirtualPrivateInvoke() {
208 return compareTo(JDK1_11) >= 0;
209 }
210
211 /** Does the target VM support sealed types
212 */
213 public boolean hasSealedClasses() {
214 return compareTo(JDK1_15) >= 0;
215 }
216
217 /** Is the ACC_STRICT bit redundant and obsolete
218 */
219 public boolean obsoleteAccStrict() {
220 return compareTo(JDK1_17) >= 0;
221 }
222
223 /** Omit unused enclosing instance fields from inner classes that don't access enclosing
224 * instance state.
225 */
226 public boolean optimizeOuterThis() {
227 return compareTo(JDK1_18) >= 0;
228 }
229 }