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("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     private static final Context.Key<Target> targetKey = new Context.Key<>();
  79 
  80     public static Target instance(Context context) {
  81         Target instance = context.get(targetKey);
  82         if (instance == null) {
  83             Options options = Options.instance(context);
  84             String targetString = options.get(TARGET);
  85             if (targetString != null) instance = lookup(targetString);
  86             if (instance == null) instance = DEFAULT;
  87             context.put(targetKey, instance);
  88         }
  89         return instance;
  90     }
  91 
  92     public static final Target MIN = Target.JDK1_7;
  93 
  94     private static final Target MAX = values()[values().length - 1];
  95 
  96     private static final Map<String,Target> tab = new HashMap<>();
  97     static {
  98         for (Target t : values()) {
  99             tab.put(t.name, t);
 100         }
 101         tab.put("1.5", JDK1_5);
 102         tab.put("1.6", JDK1_6);
 103         tab.put("1.7", JDK1_7);
 104         tab.put("1.8", JDK1_8);
 105         tab.put("1.9", JDK1_9);
 106         tab.put("1.10", JDK1_10);
 107     }
 108 
 109     public final String name;
 110     public final int majorVersion;
 111     public final int minorVersion;
 112     private Target(String name, int majorVersion, int minorVersion) {
 113         this.name = name;
 114         this.majorVersion = majorVersion;
 115         this.minorVersion = minorVersion;
 116     }
 117 
 118     public static final Target DEFAULT = values()[values().length - 1];
 119 
 120     public static Target lookup(String name) {
 121         return tab.get(name);
 122     }
 123 
 124     public boolean isSupported() {
 125         return this.compareTo(MIN) >= 0;
 126     }
 127 
 128     /** Return the character to be used in constructing synthetic
 129      *  identifiers, where not specified by the JLS.
 130      */
 131     public char syntheticNameChar() {
 132         return '$';
 133     }
 134 
 135     /** Does the target VM expect MethodParameters attributes?
 136      */
 137     public boolean hasMethodParameters() {
 138         return compareTo(JDK1_8) >= 0;
 139     }
 140 
 141     /** Does the target JDK contain StringConcatFactory class?
 142      */
 143     public boolean hasStringConcatFactory() {
 144         return compareTo(JDK1_9) >= 0;
 145     }
 146 
 147     /** Does the target JDK knows about condy?
 148      */
 149     public boolean hasCondy() {
 150         return compareTo(JDK1_10) >= 0;
 151     }
 152 
 153     /** Value of platform release used to access multi-release jar files
 154      */
 155     public String multiReleaseValue() {
 156         return Integer.toString(this.ordinal() - Target.JDK1_1.ordinal() + 1);
 157     }
 158 
 159     /** All modules that export an API are roots when compiling code in the unnamed
 160      *  module and targeting 11 or newer.
 161      */
 162     public boolean allApiModulesAreRoots() {
 163         return compareTo(JDK1_11) >= 0;
 164     }
 165 
 166     /** Does the target VM support nestmate access?
 167      */
 168     public boolean hasNestmateAccess() {
 169         return compareTo(JDK1_11) >= 0;
 170     }
 171 
 172     /** Does the target VM support virtual private invocations?
 173      */
 174     public boolean hasVirtualPrivateInvoke() {
 175         return compareTo(JDK1_11) >= 0;
 176     }
 177 
 178 }