1 /*
2 * Copyright (c) 2002, 2018, 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 covers the to be determined language features that will be added in JDK 11. */
85 JDK11("11");
86
87 private static final Context.Key<Source> sourceKey = new Context.Key<>();
88
89 public static Source instance(Context context) {
90 Source instance = context.get(sourceKey);
91 if (instance == null) {
92 Options options = Options.instance(context);
93 String sourceString = options.get(SOURCE);
94 if (sourceString != null) instance = lookup(sourceString);
95 if (instance == null) instance = DEFAULT;
96 context.put(sourceKey, instance);
97 }
98 return instance;
99 }
100
101 public final String name;
102
103 private static final Map<String,Source> tab = new HashMap<>();
104 static {
105 for (Source s : values()) {
106 tab.put(s.name, s);
107 }
108 tab.put("1.5", JDK5); // Make 5 an alias for 1.5
109 tab.put("1.6", JDK6); // Make 6 an alias for 1.6
110 tab.put("1.7", JDK7); // Make 7 an alias for 1.7
111 tab.put("1.8", JDK8); // Make 8 an alias for 1.8
112 tab.put("1.9", JDK9); // Make 9 an alias for 1.9
113 tab.put("1.10", JDK10); // Make 10 an alias for 1.10
114 // Decline to make 1.11 an alias for 11.
115 }
116
117 private Source(String name) {
118 this.name = name;
119 }
120
121 public static final Source MIN = Source.JDK6;
122
123 private static final Source MAX = values()[values().length - 1];
124
125 public static final Source DEFAULT = MAX;
126
127 public static Source lookup(String name) {
128 return tab.get(name);
129 }
130
131 public Target requiredTarget() {
132 if (this.compareTo(JDK11) >= 0) return Target.JDK1_11;
133 if (this.compareTo(JDK10) >= 0) return Target.JDK1_10;
134 if (this.compareTo(JDK9) >= 0) return Target.JDK1_9;
135 if (this.compareTo(JDK8) >= 0) return Target.JDK1_8;
136 if (this.compareTo(JDK7) >= 0) return Target.JDK1_7;
137 if (this.compareTo(JDK6) >= 0) return Target.JDK1_6;
138 if (this.compareTo(JDK5) >= 0) return Target.JDK1_5;
139 if (this.compareTo(JDK1_4) >= 0) return Target.JDK1_4;
140 return Target.JDK1_1;
141 }
142
143 /**
144 * Models a feature of the Java programming language. Each feature can be associated with a
145 * minimum source level, a maximum source level and a diagnostic fragment describing the feature,
146 * which is used to generate error messages of the kind {@code feature XYZ not supported in source N}.
147 */
148 public enum Feature {
149
150 DIAMOND(JDK7, Fragments.FeatureDiamond, DiagKind.NORMAL),
151 MULTICATCH(JDK7, Fragments.FeatureMulticatch, DiagKind.PLURAL),
152 IMPROVED_RETHROW_ANALYSIS(JDK7),
153 IMPROVED_CATCH_ANALYSIS(JDK7),
154 MODULES(JDK9, Fragments.FeatureModules, DiagKind.PLURAL),
155 TRY_WITH_RESOURCES(JDK7, Fragments.FeatureTryWithResources, DiagKind.NORMAL),
156 EFFECTIVELY_FINAL_VARIABLES_IN_TRY_WITH_RESOURCES(JDK9, Fragments.FeatureVarInTryWithResources, DiagKind.PLURAL),
157 BINARY_LITERALS(JDK7, Fragments.FeatureBinaryLit, DiagKind.PLURAL),
158 UNDERSCORES_IN_LITERALS(JDK7, Fragments.FeatureUnderscoreLit, DiagKind.PLURAL),
159 STRINGS_IN_SWITCH(JDK7, Fragments.FeatureStringSwitch, DiagKind.PLURAL),
160 DEPRECATION_ON_IMPORT(MIN, JDK8),
161 SIMPLIFIED_VARARGS(JDK7),
162 OBJECT_TO_PRIMITIVE_CAST(JDK7),
163 ENFORCE_THIS_DOT_INIT(JDK7),
164 POLY(JDK8),
165 LAMBDA(JDK8, Fragments.FeatureLambda, DiagKind.PLURAL),
166 METHOD_REFERENCES(JDK8, Fragments.FeatureMethodReferences, DiagKind.PLURAL),
167 DEFAULT_METHODS(JDK8, Fragments.FeatureDefaultMethods, DiagKind.PLURAL),
168 STATIC_INTERFACE_METHODS(JDK8, Fragments.FeatureStaticIntfMethods, DiagKind.PLURAL),
169 STATIC_INTERFACE_METHODS_INVOKE(JDK8, Fragments.FeatureStaticIntfMethodInvoke, DiagKind.PLURAL),
170 STRICT_METHOD_CLASH_CHECK(JDK8),
171 EFFECTIVELY_FINAL_IN_INNER_CLASSES(JDK8),
172 TYPE_ANNOTATIONS(JDK8, Fragments.FeatureTypeAnnotations, DiagKind.PLURAL),
173 ANNOTATIONS_AFTER_TYPE_PARAMS(JDK8, Fragments.FeatureAnnotationsAfterTypeParams, DiagKind.PLURAL),
174 REPEATED_ANNOTATIONS(JDK8, Fragments.FeatureRepeatableAnnotations, DiagKind.PLURAL),
175 INTERSECTION_TYPES_IN_CAST(JDK8, Fragments.FeatureIntersectionTypesInCast, DiagKind.PLURAL),
176 GRAPH_INFERENCE(JDK8),
177 FUNCTIONAL_INTERFACE_MOST_SPECIFIC(JDK8),
178 POST_APPLICABILITY_VARARGS_ACCESS_CHECK(JDK8),
179 MAP_CAPTURES_TO_BOUNDS(MIN, JDK7),
180 PRIVATE_SAFE_VARARGS(JDK9),
181 DIAMOND_WITH_ANONYMOUS_CLASS_CREATION(JDK9, Fragments.FeatureDiamondAndAnonClass, DiagKind.NORMAL),
182 UNDERSCORE_IDENTIFIER(MIN, JDK8),
183 PRIVATE_INTERFACE_METHODS(JDK9, Fragments.FeaturePrivateIntfMethods, DiagKind.PLURAL),
184 LOCAL_VARIABLE_TYPE_INFERENCE(JDK10),
185 IMPORT_ON_DEMAND_OBSERVABLE_PACKAGES(JDK1_2, JDK8);
186
187 enum DiagKind {
188 NORMAL,
189 PLURAL;
190 }
191
192 private final Source minLevel;
193 private final Source maxLevel;
194 private final Fragment optFragment;
195 private final DiagKind optKind;
196
197 Feature(Source minLevel) {
198 this(minLevel, null, null);
199 }
200
201 Feature(Source minLevel, Fragment optFragment, DiagKind optKind) {
202 this(minLevel, MAX, optFragment, optKind);
203 }
204
205 Feature(Source minLevel, Source maxLevel) {
206 this(minLevel, maxLevel, null, null);
207 }
208
209 Feature(Source minLevel, Source maxLevel, Fragment optFragment, DiagKind optKind) {
210 this.minLevel = minLevel;
211 this.maxLevel = maxLevel;
212 this.optFragment = optFragment;
213 this.optKind = optKind;
214 }
215
216 public boolean allowedInSource(Source source) {
217 return source.compareTo(minLevel) >= 0 &&
218 source.compareTo(maxLevel) <= 0;
219 }
220
221 public boolean isPlural() {
222 Assert.checkNonNull(optKind);
223 return optKind == DiagKind.PLURAL;
224 }
225
226 public Fragment nameFragment() {
227 Assert.checkNonNull(optFragment);
228 return optFragment;
229 }
230
231 public Fragment fragment(String sourceName) {
232 Assert.checkNonNull(optFragment);
233 return optKind == DiagKind.NORMAL ?
234 Fragments.FeatureNotSupportedInSource(optFragment, sourceName, minLevel.name) :
235 Fragments.FeatureNotSupportedInSourcePlural(optFragment, sourceName, minLevel.name);
236 }
237
238 public Error error(String sourceName) {
239 Assert.checkNonNull(optFragment);
240 return optKind == DiagKind.NORMAL ?
241 Errors.FeatureNotSupportedInSource(optFragment, sourceName, minLevel.name) :
242 Errors.FeatureNotSupportedInSourcePlural(optFragment, sourceName, minLevel.name);
243 }
244 }
245
246 public static SourceVersion toSourceVersion(Source source) {
247 switch(source) {
248 case JDK1_2:
249 return RELEASE_2;
250 case JDK1_3:
251 return RELEASE_3;
252 case JDK1_4:
253 return RELEASE_4;
254 case JDK5:
255 return RELEASE_5;
256 case JDK6:
257 return RELEASE_6;
258 case JDK7:
259 return RELEASE_7;
260 case JDK8:
261 return RELEASE_8;
262 case JDK9:
263 return RELEASE_9;
264 case JDK10:
265 return RELEASE_10;
266 case JDK11:
267 return RELEASE_11;
268 default:
269 return null;
270 }
271 }
272 }