1 /*
   2  * Copyright (c) 2002, 2019, 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     private static final Context.Key<Target> targetKey = new Context.Key<>();
  82 
  83     public static Target instance(Context context) {
  84         Target instance = context.get(targetKey);
  85         if (instance == null) {
  86             Options options = Options.instance(context);
  87             String targetString = options.get(TARGET);
  88             if (targetString != null) instance = lookup(targetString);
  89             if (instance == null) instance = DEFAULT;
  90             context.put(targetKey, instance);
  91         }
  92         return instance;
  93     }
  94 
  95     public static final Target MIN = Target.JDK1_7;
  96 
  97     private static final Target MAX = values()[values().length - 1];
  98 
  99     private static final Map<String,Target> tab = new HashMap<>();
 100     static {
 101         for (Target t : values()) {
 102             tab.put(t.name, t);
 103         }
 104         tab.put("1.5", JDK1_5);
 105         tab.put("1.6", JDK1_6);
 106         tab.put("1.7", JDK1_7);
 107         tab.put("1.8", JDK1_8);
 108         tab.put("1.9", JDK1_9);
 109         tab.put("1.10", JDK1_10);
 110     }
 111 
 112     public final String name;
 113     public final int majorVersion;
 114     public final int minorVersion;
 115     private Target(String name, int majorVersion, int minorVersion) {
 116         this.name = name;
 117         this.majorVersion = majorVersion;
 118         this.minorVersion = minorVersion;
 119     }
 120 
 121     public static final Target DEFAULT = values()[values().length - 1];
 122 
 123     public static Target lookup(String name) {
 124         return tab.get(name);
 125     }
 126 
 127     public boolean isSupported() {
 128         return this.compareTo(MIN) >= 0;
 129     }
 130 
 131     /** Return the character to be used in constructing synthetic
 132      *  identifiers, where not specified by the JLS.
 133      */
 134     public char syntheticNameChar() {
 135         return '$';
 136     }
 137 
 138     /** Does the target VM expect MethodParameters attributes?
 139      */
 140     public boolean hasMethodParameters() {
 141         return compareTo(JDK1_8) >= 0;
 142     }
 143 
 144     /** Does the target JDK contain StringConcatFactory class?
 145      */
 146     public boolean hasStringConcatFactory() {
 147         return compareTo(JDK1_9) >= 0;
 148     }
 149 
 150     /** Value of platform release used to access multi-release jar files
 151      */
 152     public String multiReleaseValue() {
 153         return Integer.toString(this.ordinal() - Target.JDK1_1.ordinal() + 1);
 154     }
 155 
 156     /** All modules that export an API are roots when compiling code in the unnamed
 157      *  module and targeting 11 or newer.
 158      */
 159     public boolean allApiModulesAreRoots() {
 160         return compareTo(JDK1_11) >= 0;
 161     }
 162 
 163     /** Does the target VM support nestmate access?
 164      */
 165     public boolean hasNestmateAccess() {
 166         return compareTo(JDK1_11) >= 0;
 167     }
 168 
 169     /** Does the target VM support virtual private invocations?
 170      */
 171     public boolean hasVirtualPrivateInvoke() {
 172         return compareTo(JDK1_11) >= 0;
 173     }
 174 
 175     /** Does the target VM support sealed types
 176      */
 177     public boolean hasSealedTypes() {
 178         return compareTo(JDK1_12) >= 0;
 179     }
 180 }