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.code;
27
28 import java.util.*;
29
30 import javax.lang.model.SourceVersion;
31 import static javax.lang.model.SourceVersion.*;
32
33 import com.sun.tools.javac.jvm.Target;
34 import com.sun.tools.javac.resources.CompilerProperties.Errors;
35 import com.sun.tools.javac.resources.CompilerProperties.Fragments;
36 import com.sun.tools.javac.util.*;
37 import com.sun.tools.javac.util.JCDiagnostic.Error;
38 import com.sun.tools.javac.util.JCDiagnostic.Fragment;
39
40 import static com.sun.tools.javac.main.Option.*;
41
42 /** The source language version accepted.
43 *
44 * <p><b>This is NOT part of any supported API.
45 * If you write code that depends on this, you do so at your own risk.
46 * This code and its internal interfaces are subject to change or
47 * deletion without notice.</b>
48 */
49 public enum Source {
50 /** 1.0 had no inner classes, and so could not pass the JCK. */
51 // public static final Source JDK1_0 = new Source("1.0");
52
53 /** 1.1 did not have strictfp, and so could not pass the JCK. */
54 // public static final Source JDK1_1 = new Source("1.1");
55
56 /** 1.2 introduced strictfp. */
57 JDK1_2("1.2"),
58
59 /** 1.3 is the same language as 1.2. */
60 JDK1_3("1.3"),
61
62 /** 1.4 introduced assert. */
63 JDK1_4("1.4"),
64
65 /** 1.5 introduced generics, attributes, foreach, boxing, static import,
66 * covariant return, enums, varargs, et al. */
67 JDK5("5"),
68
69 /** 1.6 reports encoding problems as errors instead of warnings. */
70 JDK6("6"),
71
72 /** 1.7 introduced try-with-resources, multi-catch, string switch, etc. */
73 JDK7("7"),
74
75 /** 1.8 lambda expressions and default methods. */
76 JDK8("8"),
77
78 /** 1.9 modularity. */
79 JDK9("9"),
80
81 /** 1.10 local-variable type inference (var). */
82 JDK10("10"),
83
84 /** 1.11 local-variable syntax for lambda parameters */
85 JDK11("11"),
86
87 /** 12, no language features; switch expression in preview */
88 JDK12("12"),
89
90 /**
91 * 13, no language features; text blocks and revised switch
92 * expressions in preview
93 */
94 JDK13("13"),
95
96 /**
97 * 14, switch expressions; pattern matching, records, and revised
98 * text blocks in preview
99 */
100 JDK14("14"),
101
102 /**
103 * 15, text blocks
104 */
105 JDK15("15"),
106
107 /**
108 * 16, records and pattern matching for instanceof
109 */
110 JDK16("16"),
111
112 /**
113 * 17, sealed classes, restoration of always-strict floating-point
114 */
115 JDK17("17"),
116
117 /**
118 * 18, no major changes
119 */
120 JDK18("18"),
121
122 /**
123 * 19, no major changes
124 */
125 JDK19("19"),
126
127 /**
128 * 20, no major changes
129 */
130 JDK20("20"),
131
132 /**
133 * 21, tbd
134 */
135 JDK21("21"),
136
137 /**
138 * 22, tbd
139 */
140 JDK22("22"),
141 ; // Reduce code churn when appending new constants
142
143 private static final Context.Key<Source> sourceKey = new Context.Key<>();
144
145 public static Source instance(Context context) {
146 Source instance = context.get(sourceKey);
147 if (instance == null) {
148 Options options = Options.instance(context);
149 String sourceString = options.get(SOURCE);
150 if (sourceString != null) instance = lookup(sourceString);
151 if (instance == null) instance = DEFAULT;
152 context.put(sourceKey, instance);
153 }
154 return instance;
155 }
156
157 public final String name;
158
159 private static final Map<String,Source> tab = new HashMap<>();
160 static {
161 for (Source s : values()) {
162 tab.put(s.name, s);
163 }
164 tab.put("1.5", JDK5); // Make 5 an alias for 1.5
165 tab.put("1.6", JDK6); // Make 6 an alias for 1.6
166 tab.put("1.7", JDK7); // Make 7 an alias for 1.7
167 tab.put("1.8", JDK8); // Make 8 an alias for 1.8
168 tab.put("1.9", JDK9); // Make 9 an alias for 1.9
169 tab.put("1.10", JDK10); // Make 10 an alias for 1.10
170 // Decline to make 1.11 an alias for 11.
171 }
172
173 private Source(String name) {
174 this.name = name;
175 }
176
177 public static final Source MIN = Source.JDK8;
178
179 private static final Source MAX = values()[values().length - 1];
180
181 public static final Source DEFAULT = MAX;
182
183 public static Source lookup(String name) {
184 return tab.get(name);
185 }
186
187 public boolean isSupported() {
188 return this.compareTo(MIN) >= 0;
189 }
190
191 public static boolean isSupported(Feature feature, int majorVersion) {
192 Source source = null;
193 for (Target target : Target.values()) {
194 if (majorVersion == target.majorVersion) {
195 source = lookup(target.name);
196 }
197 }
198 if (source != null) {
199 return feature.allowedInSource(source);
200 }
201 return false;
202 }
203
204 public Target requiredTarget() {
205 return switch(this) {
206 case JDK22 -> Target.JDK1_22;
207 case JDK21 -> Target.JDK1_21;
208 case JDK20 -> Target.JDK1_20;
209 case JDK19 -> Target.JDK1_19;
210 case JDK18 -> Target.JDK1_18;
211 case JDK17 -> Target.JDK1_17;
212 case JDK16 -> Target.JDK1_16;
213 case JDK15 -> Target.JDK1_15;
214 case JDK14 -> Target.JDK1_14;
215 case JDK13 -> Target.JDK1_13;
216 case JDK12 -> Target.JDK1_12;
217 case JDK11 -> Target.JDK1_11;
218 case JDK10 -> Target.JDK1_10;
219 case JDK9 -> Target.JDK1_9;
220 case JDK8 -> Target.JDK1_8;
221 case JDK7 -> Target.JDK1_7;
222 case JDK6 -> Target.JDK1_6;
223 case JDK5 -> Target.JDK1_5;
224 case JDK1_4 -> Target.JDK1_4;
225 default -> Target.JDK1_1;
226 };
227 }
228
229 /**
230 * Models a feature of the Java programming language. Each feature can be associated with a
231 * minimum source level, a maximum source level and a diagnostic fragment describing the feature,
232 * which is used to generate error messages of the kind {@code feature XYZ not supported in source N}.
233 */
234 public enum Feature {
235
236 MODULES(JDK9, Fragments.FeatureModules, DiagKind.PLURAL),
237 EFFECTIVELY_FINAL_VARIABLES_IN_TRY_WITH_RESOURCES(JDK9, Fragments.FeatureVarInTryWithResources, DiagKind.PLURAL),
238 DEPRECATION_ON_IMPORT(MIN, JDK8),
239 PRIVATE_SAFE_VARARGS(JDK9),
240 DIAMOND_WITH_ANONYMOUS_CLASS_CREATION(JDK9, Fragments.FeatureDiamondAndAnonClass, DiagKind.NORMAL),
241 UNDERSCORE_IDENTIFIER(MIN, JDK8),
242 PRIVATE_INTERFACE_METHODS(JDK9, Fragments.FeaturePrivateIntfMethods, DiagKind.PLURAL),
243 LOCAL_VARIABLE_TYPE_INFERENCE(JDK10),
244 VAR_SYNTAX_IMPLICIT_LAMBDAS(JDK11, Fragments.FeatureVarSyntaxInImplicitLambda, DiagKind.PLURAL),
245 IMPORT_ON_DEMAND_OBSERVABLE_PACKAGES(JDK1_2, JDK8),
246 SWITCH_MULTIPLE_CASE_LABELS(JDK14, Fragments.FeatureMultipleCaseLabels, DiagKind.PLURAL),
247 SWITCH_RULE(JDK14, Fragments.FeatureSwitchRules, DiagKind.PLURAL),
248 SWITCH_EXPRESSION(JDK14, Fragments.FeatureSwitchExpressions, DiagKind.PLURAL),
249 NO_TARGET_ANNOTATION_APPLICABILITY(JDK14),
250 TEXT_BLOCKS(JDK15, Fragments.FeatureTextBlocks, DiagKind.PLURAL),
251 PATTERN_MATCHING_IN_INSTANCEOF(JDK16, Fragments.FeaturePatternMatchingInstanceof, DiagKind.NORMAL),
252 REIFIABLE_TYPES_INSTANCEOF(JDK16, Fragments.FeatureReifiableTypesInstanceof, DiagKind.PLURAL),
253 RECORDS(JDK16, Fragments.FeatureRecords, DiagKind.PLURAL),
254 SEALED_CLASSES(JDK17, Fragments.FeatureSealedClasses, DiagKind.PLURAL),
255 CASE_NULL(JDK21, Fragments.FeatureCaseNull, DiagKind.NORMAL),
256 PATTERN_SWITCH(JDK21, Fragments.FeaturePatternSwitch, DiagKind.PLURAL),
257 REDUNDANT_STRICTFP(JDK17),
258 UNCONDITIONAL_PATTERN_IN_INSTANCEOF(JDK21, Fragments.FeatureUnconditionalPatternsInInstanceof, DiagKind.PLURAL),
259 RECORD_PATTERNS(JDK21, Fragments.FeatureDeconstructionPatterns, DiagKind.PLURAL),
260 STRING_TEMPLATES(JDK21, Fragments.FeatureStringTemplates, DiagKind.PLURAL),
261 IMPLICIT_CLASSES(JDK21, Fragments.FeatureImplicitClasses, DiagKind.PLURAL),
262 WARN_ON_ILLEGAL_UTF8(MIN, JDK21),
263 UNNAMED_VARIABLES(JDK22, Fragments.FeatureUnnamedVariables, DiagKind.PLURAL),
264 SUPER_INIT(JDK22, Fragments.FeatureSuperInit, DiagKind.NORMAL),
265 VALUE_CLASSES(JDK22, Fragments.FeatureValueClasses, DiagKind.PLURAL),
266 ;
267
268 enum DiagKind {
269 NORMAL,
270 PLURAL;
271 }
272
273 private final Source minLevel;
274 private final Source maxLevel;
275 private final Fragment optFragment;
276 private final DiagKind optKind;
277
278 Feature(Source minLevel) {
279 this(minLevel, null, null);
280 }
281
282 Feature(Source minLevel, Fragment optFragment, DiagKind optKind) {
283 this(minLevel, MAX, optFragment, optKind);
284 }
285
286 Feature(Source minLevel, Source maxLevel) {
287 this(minLevel, maxLevel, null, null);
288 }
289
290 Feature(Source minLevel, Source maxLevel, Fragment optFragment, DiagKind optKind) {
291 this.minLevel = minLevel;
292 this.maxLevel = maxLevel;
293 this.optFragment = optFragment;
294 this.optKind = optKind;
295 }
296
297 public boolean allowedInSource(Source source) {
298 return source.compareTo(minLevel) >= 0 &&
299 source.compareTo(maxLevel) <= 0;
300 }
301
302 public boolean isPlural() {
303 Assert.checkNonNull(optKind);
304 return optKind == DiagKind.PLURAL;
305 }
306
307 public Fragment nameFragment() {
308 Assert.checkNonNull(optFragment);
309 return optFragment;
310 }
311
312 public Fragment fragment(String sourceName) {
313 Assert.checkNonNull(optFragment);
314 return optKind == DiagKind.NORMAL ?
315 Fragments.FeatureNotSupportedInSource(optFragment, sourceName, minLevel.name) :
316 Fragments.FeatureNotSupportedInSourcePlural(optFragment, sourceName, minLevel.name);
317 }
318
319 public Error error(String sourceName) {
320 Assert.checkNonNull(optFragment);
321 return optKind == DiagKind.NORMAL ?
322 Errors.FeatureNotSupportedInSource(optFragment, sourceName, minLevel.name) :
323 Errors.FeatureNotSupportedInSourcePlural(optFragment, sourceName, minLevel.name);
324 }
325 }
326
327 public static SourceVersion toSourceVersion(Source source) {
328 return switch(source) {
329 case JDK1_2 -> RELEASE_2;
330 case JDK1_3 -> RELEASE_3;
331 case JDK1_4 -> RELEASE_4;
332 case JDK5 -> RELEASE_5;
333 case JDK6 -> RELEASE_6;
334 case JDK7 -> RELEASE_7;
335 case JDK8 -> RELEASE_8;
336 case JDK9 -> RELEASE_9;
337 case JDK10 -> RELEASE_10;
338 case JDK11 -> RELEASE_11;
339 case JDK12 -> RELEASE_12;
340 case JDK13 -> RELEASE_13;
341 case JDK14 -> RELEASE_14;
342 case JDK15 -> RELEASE_15;
343 case JDK16 -> RELEASE_16;
344 case JDK17 -> RELEASE_17;
345 case JDK18 -> RELEASE_18;
346 case JDK19 -> RELEASE_19;
347 case JDK20 -> RELEASE_20;
348 case JDK21 -> RELEASE_21;
349 case JDK22 -> RELEASE_22;
350 default -> null;
351 };
352 }
353 }