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.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("1.5", 49, 0),
53
54 /** JDK 6. */
55 JDK1_6("1.6", 50, 0),
56
57 /** JDK 7. */
58 JDK1_7("1.7", 51, 0),
59
60 /** JDK 8. */
61 JDK1_8("1.8", 52, 0),
62
63 /** JDK 9. */
64 JDK1_9("1.9", 53, 0),
65
66 /** JDK 10. */
67 JDK1_10("1.10", 54, 0),
68
69 /** JDK 11. */
70 JDK1_11("11", 55, 0);
71
72 private static final Context.Key<Target> targetKey = new Context.Key<>();
73
74 public static Target instance(Context context) {
75 Target instance = context.get(targetKey);
76 if (instance == null) {
77 Options options = Options.instance(context);
78 String targetString = options.get(TARGET);
79 if (targetString != null) instance = lookup(targetString);
80 if (instance == null) instance = DEFAULT;
81 context.put(targetKey, instance);
82 }
83 return instance;
84 }
85
86 public static final Target MIN = Target.JDK1_6;
87
88 private static final Target MAX = values()[values().length - 1];
89
90 private static final Map<String,Target> tab = new HashMap<>();
91 static {
92 for (Target t : values()) {
93 tab.put(t.name, t);
94 }
95 tab.put("5", JDK1_5);
96 tab.put("6", JDK1_6);
97 tab.put("7", JDK1_7);
98 tab.put("8", JDK1_8);
99 tab.put("9", JDK1_9);
100 tab.put("10", JDK1_10);
101 tab.put("11", JDK1_11);
102 }
103
104 public final String name;
105 public final int majorVersion;
106 public final int minorVersion;
107 private Target(String name, int majorVersion, int minorVersion) {
108 this.name = name;
109 this.majorVersion = majorVersion;
110 this.minorVersion = minorVersion;
111 }
112
113 public static final Target DEFAULT = values()[values().length - 1];
114
115 public static Target lookup(String name) {
116 return tab.get(name);
117 }
118
119 /** Return the character to be used in constructing synthetic
120 * identifiers, where not specified by the JLS.
121 */
122 public char syntheticNameChar() {
123 return '$';
124 }
125
126 /** Does the VM support an invokedynamic instruction?
127 */
128 public boolean hasInvokedynamic() {
129 return compareTo(JDK1_7) >= 0;
130 }
131
132 /** Does the target JDK contains the java.util.Objects class?
133 */
134 public boolean hasObjects() {
135 return compareTo(JDK1_7) >= 0;
136 }
137
138 /** Does the VM support polymorphic method handle invocation?
139 * Affects the linkage information output to the classfile.
140 * An alias for {@code hasInvokedynamic}, since all the JSR 292 features appear together.
141 */
142 public boolean hasMethodHandles() {
143 return hasInvokedynamic();
144 }
145
146 /** Does the target JDK contain StringConcatFactory class?
147 */
148 public boolean hasStringConcatFactory() {
149 return compareTo(JDK1_9) >= 0;
150 }
151
152 /** Value of platform release used to access multi-release jar files
153 */
154 public String multiReleaseValue() {
155 return Integer.toString(this.ordinal() - Target.JDK1_1.ordinal() + 1);
156 }
157
158 /** Does the target VM support nestmate access?
159 */
160 public boolean hasNestmateAccess() {
161 return compareTo(JDK1_11) >= 0;
162 }
163
164 /** Does the target VM support virtual private invocations?
165 */
166 public boolean hasVirtualPrivateInvoke() {
167 return compareTo(JDK1_11) >= 0;
168 }
169
170 }