1 /*
2 * Copyright (c) 2002, 2024, 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
108 /** JDK 24. */
109 JDK1_24("24", 68, 0),
110
111 /** JDK 25. */
112 JDK1_25("25", 69, 0),
113 ; // Reduce code churn when appending new constants
114
115 private static final Context.Key<Target> targetKey = new Context.Key<>();
116
117 public static Target instance(Context context) {
118 Target instance = context.get(targetKey);
119 if (instance == null) {
120 Options options = Options.instance(context);
121 String targetString = options.get(TARGET);
122 if (targetString != null) instance = lookup(targetString);
123 if (instance == null) instance = DEFAULT;
124 context.put(targetKey, instance);
125 }
126 return instance;
127 }
128
129 public static final Target MIN = Target.JDK1_8;
130
131 private static final Target MAX = values()[values().length - 1];
132
133 public static final Target DEFAULT = MAX;
134
135 private static final Map<String,Target> tab = new HashMap<>();
136 static {
137 for (Target t : values()) {
138 tab.put(t.name, t);
139 }
140 tab.put("1.5", JDK1_5);
141 tab.put("1.6", JDK1_6);
142 tab.put("1.7", JDK1_7);
143 tab.put("1.8", JDK1_8);
144 tab.put("1.9", JDK1_9);
145 tab.put("1.10", JDK1_10);
146 }
147
148 public final String name;
149 public final int majorVersion;
150 public final int minorVersion;
151 private Target(String name, int majorVersion, int minorVersion) {
152 this.name = name;
153 this.majorVersion = majorVersion;
154 this.minorVersion = minorVersion;
155 }
156
157 public static Target lookup(String name) {
158 return tab.get(name);
159 }
160
161 public boolean isSupported() {
162 return this.compareTo(MIN) >= 0;
163 }
164
165 /** Return the character to be used in constructing synthetic
166 * identifiers, where not specified by the JLS.
167 */
168 public char syntheticNameChar() {
169 return '$';
170 }
171
172 /** Does the target VM expect MethodParameters attributes?
173 */
174 public boolean hasMethodParameters() {
175 return compareTo(JDK1_8) >= 0;
176 }
177
178 /** Does the target JDK contain StringConcatFactory class?
179 */
180 public boolean hasStringConcatFactory() {
181 return compareTo(JDK1_9) >= 0;
182 }
183
184 /** Value of platform release used to access multi-release jar files
185 */
186 public String multiReleaseValue() {
187 return Integer.toString(this.ordinal() - Target.JDK1_1.ordinal() + 1);
188 }
189
190 /** All modules that export an API are roots when compiling code in the unnamed
191 * module and targeting 11 or newer.
192 */
193 public boolean allApiModulesAreRoots() {
194 return compareTo(JDK1_11) >= 0;
195 }
196
197 /** Does the target VM support nestmate access?
198 */
199 public boolean hasNestmateAccess() {
200 return compareTo(JDK1_11) >= 0;
201 }
202
203 /** language runtime uses nest-based access.
204 * e.g. lambda and string concat spin dynamic proxy class as a nestmate
205 * of the target class
206 */
207 public boolean runtimeUseNestAccess() {
208 return compareTo(JDK1_15) >= 0;
209 }
210
211 /** Does the target VM support virtual private invocations?
212 */
213 public boolean hasVirtualPrivateInvoke() {
214 return compareTo(JDK1_11) >= 0;
215 }
216
217 /** Does the target VM support sealed types
218 */
219 public boolean hasSealedClasses() {
220 return compareTo(JDK1_15) >= 0;
221 }
222
223 /** Is the ACC_STRICT bit redundant and obsolete
224 */
225 public boolean obsoleteAccStrict() {
226 return compareTo(JDK1_17) >= 0;
227 }
228
229 /** Omit unused enclosing instance fields from inner classes that don't access enclosing
230 * instance state.
231 */
232 public boolean optimizeOuterThis() {
233 return compareTo(JDK1_18) >= 0;
234 }
235
236 /** Releases prior to JDK 23 expect a less precise SwitchBootstraps.typeSwitch signature on the selectorType
237 */
238 public boolean usesReferenceOnlySelectorTypes() {
239 return compareTo(Target.JDK1_23) < 0;
240 }
241
242 /**
243 * Should we emit a null check against incoming outer this argument by default?
244 */
245 public boolean nullCheckOuterThisByDefault() {
246 return compareTo(JDK1_25) >= 0;
247 }
248 }