author | mcimadamore |
Thu, 05 Mar 2015 15:03:07 +0000 | |
changeset 29295 | 5a367770a074 |
parent 25874 | 83c19f00452c |
child 35424 | 96661d1df628 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2002, 2014, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package com.sun.tools.javac.jvm; |
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import java.util.*; |
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import com.sun.tools.javac.code.Flags; |
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import com.sun.tools.javac.code.Symbol; |
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import com.sun.tools.javac.util.*; |
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import static com.sun.tools.javac.main.Option.TARGET; |
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/** The classfile version target. |
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* |
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* <p><b>This is NOT part of any supported API. |
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* If you write code that depends on this, you do so at your own risk. |
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* This code and its internal interfaces are subject to change or |
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* deletion without notice.</b> |
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*/ |
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public enum Target { |
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JDK1_1("1.1", 45, 3), |
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JDK1_2("1.2", 46, 0), |
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JDK1_3("1.3", 47, 0), |
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/** J2SE1.4 = Merlin. */ |
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JDK1_4("1.4", 48, 0), |
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/** JDK 5, codename Tiger. */ |
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JDK1_5("1.5", 49, 0), |
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/** JDK 6. */ |
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JDK1_6("1.6", 50, 0), |
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/** JDK 7. */ |
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JDK1_7("1.7", 51, 0), |
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/** JDK 8. */ |
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JDK1_8("1.8", 52, 0), |
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/** JDK 9, initially an alias for 8. */ |
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JDK1_9("1.9", 52, 0); |
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private static final Context.Key<Target> targetKey = new Context.Key<>(); |
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public static Target instance(Context context) { |
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Target instance = context.get(targetKey); |
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if (instance == null) { |
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Options options = Options.instance(context); |
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String targetString = options.get(TARGET); |
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if (targetString != null) instance = lookup(targetString); |
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if (instance == null) instance = DEFAULT; |
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context.put(targetKey, instance); |
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} |
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return instance; |
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} |
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public static final Target MIN = Target.JDK1_6; |
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private static final Target MAX = values()[values().length - 1]; |
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private static final Map<String,Target> tab = new HashMap<>(); |
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static { |
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for (Target t : values()) { |
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tab.put(t.name, t); |
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} |
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tab.put("5", JDK1_5); |
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tab.put("6", JDK1_6); |
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tab.put("7", JDK1_7); |
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tab.put("8", JDK1_8); |
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tab.put("9", JDK1_9); |
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} |
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public final String name; |
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public final int majorVersion; |
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public final int minorVersion; |
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private Target(String name, int majorVersion, int minorVersion) { |
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this.name = name; |
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this.majorVersion = majorVersion; |
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this.minorVersion = minorVersion; |
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} |
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public static final Target DEFAULT = JDK1_9; |
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public static Target lookup(String name) { |
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return tab.get(name); |
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} |
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/** Return the character to be used in constructing synthetic |
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* identifiers, where not specified by the JLS. |
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*/ |
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public char syntheticNameChar() { |
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return '$'; |
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} |
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/** Does the VM support an invokedynamic instruction? |
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*/ |
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public boolean hasInvokedynamic() { |
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return compareTo(JDK1_7) >= 0; |
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} |
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/** Does the target JDK contains the java.util.Objects class? |
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*/ |
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public boolean hasObjects() { |
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return compareTo(JDK1_7) >= 0; |
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} |
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/** Does the VM support polymorphic method handle invocation? |
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* Affects the linkage information output to the classfile. |
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* An alias for {@code hasInvokedynamic}, since all the JSR 292 features appear together. |
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*/ |
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public boolean hasMethodHandles() { |
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return hasInvokedynamic(); |
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} |
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} |