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   * Copyright (c) 2002, 2021, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
   * particular file as subject to the "Classpath" exception as provided
   * by Oracle in the LICENSE file that accompanied this code.
   *
   * This code is distributed in the hope that it will be useful, but WITHOUT
   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
   * version 2 for more details (a copy is included in the LICENSE file that
   * accompanied this code).
   *
   * You should have received a copy of the GNU General Public License version
   * 2 along with this work; if not, write to the Free Software Foundation,
   * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
   * or visit www.oracle.com if you need additional information or have any
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   */
  
  package openjdk.tools.javac.jvm;
  
  import java.util.*;
  
  import openjdk.tools.javac.code.Flags;
  import openjdk.tools.javac.code.Symbol;
  import openjdk.tools.javac.util.*;
  
  import static openjdk.tools.javac.main.Option.TARGET;
  
  /** The classfile version target.
   *
   *  <p><b>This is NOT part of any supported API.
   *  If you write code that depends on this, you do so at your own risk.
   *  This code and its internal interfaces are subject to change or
   *  deletion without notice.</b>
   */
  public enum Target {
      JDK1_1("1.1", 45, 3),
      JDK1_2("1.2", 46, 0),
      JDK1_3("1.3", 47, 0),
  
      /** J2SE1.4 = Merlin. */
      JDK1_4("1.4", 48, 0),
  
      /** JDK 5, codename Tiger. */
      JDK1_5("5", 49, 0),
  
      /** JDK 6. */
      JDK1_6("6", 50, 0),
  
      /** JDK 7. */
      JDK1_7("7", 51, 0),
  
      /** JDK 8. */
      JDK1_8("8", 52, 0),
  
      /** JDK 9. */
      JDK1_9("9", 53, 0),
  
      /** JDK 10. */
      JDK1_10("10", 54, 0),
  
      /** JDK 11. */
      JDK1_11("11", 55, 0),
  
      /** JDK 12. */
      JDK1_12("12", 56, 0),
  
      /** JDK 13. */
      JDK1_13("13", 57, 0),
  
      /** JDK 14. */
      JDK1_14("14", 58, 0),
  
      /** JDK 15. */
      JDK1_15("15", 59, 0),
  
      /** JDK 16. */
      JDK1_16("16", 60, 0),
  
      /** JDK 17. */
      JDK1_17("17", 61, 0);
  
      private static final Context.Key<Target> targetKey = new Context.Key<>();
  
      public static Target instance(Context context) {
          Target instance = context.get(targetKey);
          if (instance == null) {
              Options options = Options.instance(context);
              String targetString = options.get(TARGET);
              if (targetString != null) instance = lookup(targetString);
              if (instance == null) instance = DEFAULT;
              context.put(targetKey, instance);
          }
          return instance;
      }
  
      public static final Target MIN = Target.JDK1_7;
  
      private static final Target MAX = values()[values().length - 1];
  
      private static final Map<String,Target> tab = new HashMap<>();
      static {
          for (Target t : values()) {
              tab.put(t.name, t);
          }
          tab.put("1.5", JDK1_5);
          tab.put("1.6", JDK1_6);
          tab.put("1.7", JDK1_7);
          tab.put("1.8", JDK1_8);
          tab.put("1.9", JDK1_9);
          tab.put("1.10", JDK1_10);
      }
  
      public final String name;
      public final int majorVersion;
      public final int minorVersion;
      private Target(String name, int majorVersion, int minorVersion) {
          this.name = name;
          this.majorVersion = majorVersion;
          this.minorVersion = minorVersion;
      }
  
      public static final Target DEFAULT = values()[values().length - 1];
  
      public static Target lookup(String name) {
          return tab.get(name);
      }
  
      public boolean isSupported() {
          return this.compareTo(MIN) >= 0;
      }
  
      /** Return the character to be used in constructing synthetic
       *  identifiers, where not specified by the JLS.
       */
      public char syntheticNameChar() {
          return '$';
      }
  
      /** Does the target VM expect MethodParameters attributes?
       */
      public boolean hasMethodParameters() {
          return compareTo(JDK1_8) >= 0;
      }
  
      /** Does the target JDK contain StringConcatFactory class?
       */
      public boolean hasStringConcatFactory() {
          return compareTo(JDK1_9) >= 0;
      }
  
      /** Value of platform release used to access multi-release jar files
       */
      public String multiReleaseValue() {
          return Integer.toString(this.ordinal() - Target.JDK1_1.ordinal() + 1);
      }
  
      /** All modules that export an API are roots when compiling code in the unnamed
       *  module and targeting 11 or newer.
       */
      public boolean allApiModulesAreRoots() {
          return compareTo(JDK1_11) >= 0;
      }
  
      /** Does the target VM support nestmate access?
       */
      public boolean hasNestmateAccess() {
          return compareTo(JDK1_11) >= 0;
      }
  
      /** language runtime uses nest-based access.
       *  e.g. lambda and string concat spin dynamic proxy class as a nestmate
       *  of the target class
       */
      public boolean runtimeUseNestAccess() {
          return compareTo(JDK1_15) >= 0;
      }
  
      /** Does the target VM support virtual private invocations?
       */
      public boolean hasVirtualPrivateInvoke() {
          return compareTo(JDK1_11) >= 0;
      }
  
      /** Does the target VM support sealed types
       */
      public boolean hasSealedClasses() {
          return compareTo(JDK1_15) >= 0;
      }
  
      /** Is the ACC_STRICT bit redundant and obsolete
       */
      public boolean obsoleteAccStrict() {
          return compareTo(JDK1_17) >= 0;
      }
  }
  