| /* |
| * Copyright (c) 2002, 2016, 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 |
| * questions. |
| */ |
| |
| package com.sun.tools.javac.jvm; |
| |
| import java.util.*; |
| |
| import com.sun.tools.javac.code.Flags; |
| import com.sun.tools.javac.code.Symbol; |
| import com.sun.tools.javac.util.*; |
| |
| import static com.sun.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("1.5", 49, 0), |
| |
| /** JDK 6. */ |
| JDK1_6("1.6", 50, 0), |
| |
| /** JDK 7. */ |
| JDK1_7("1.7", 51, 0), |
| |
| /** JDK 8. */ |
| JDK1_8("1.8", 52, 0), |
| |
| /** JDK 9, initially an alias for 8. */ |
| JDK1_9("1.9", 52, 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_6; |
| |
| 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("5", JDK1_5); |
| tab.put("6", JDK1_6); |
| tab.put("7", JDK1_7); |
| tab.put("8", JDK1_8); |
| tab.put("9", JDK1_9); |
| } |
| |
| 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 = JDK1_9; |
| |
| public static Target lookup(String name) { |
| return tab.get(name); |
| } |
| |
| /** Return the character to be used in constructing synthetic |
| * identifiers, where not specified by the JLS. |
| */ |
| public char syntheticNameChar() { |
| return '$'; |
| } |
| |
| /** Does the VM support an invokedynamic instruction? |
| */ |
| public boolean hasInvokedynamic() { |
| return compareTo(JDK1_7) >= 0; |
| } |
| |
| /** Does the target JDK contains the java.util.Objects class? |
| */ |
| public boolean hasObjects() { |
| return compareTo(JDK1_7) >= 0; |
| } |
| |
| /** Does the VM support polymorphic method handle invocation? |
| * Affects the linkage information output to the classfile. |
| * An alias for {@code hasInvokedynamic}, since all the JSR 292 features appear together. |
| */ |
| public boolean hasMethodHandles() { |
| return hasInvokedynamic(); |
| } |
| |
| /** 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); |
| } |
| |
| } |