| /* |
| * Copyright (c) 2002, 2013, 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), |
| |
| /** 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); |
| |
| private static final Context.Key<Target> targetKey = |
| new Context.Key<Target>(); |
| |
| 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; |
| } |
| |
| private static final Target MIN = values()[0]; |
| public static Target MIN() { return MIN; } |
| |
| private static final Target MAX = values()[values().length - 1]; |
| public static Target MAX() { return MAX; } |
| |
| private static final Map<String,Target> tab = new HashMap<String,Target>(); |
| 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); |
| } |
| |
| 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_8; |
| |
| public static Target lookup(String name) { |
| return tab.get(name); |
| } |
| |
| /** In -target 1.1 and earlier, the compiler is required to emit |
| * synthetic method definitions in abstract classes for interface |
| * methods that are not overridden. We call them "Miranda" methods. |
| */ |
| public boolean requiresIproxy() { |
| return compareTo(JDK1_1) <= 0; |
| } |
| |
| /** Beginning in 1.4, we take advantage of the possibility of emitting |
| * code to initialize fields before calling the superclass constructor. |
| * This is allowed by the VM spec, but the verifier refused to allow |
| * it until 1.4. This is necesary to translate some code involving |
| * inner classes. See, for example, 4030374. |
| */ |
| public boolean initializeFieldsBeforeSuper() { |
| return compareTo(JDK1_4) >= 0; |
| } |
| |
| /** Beginning with -target 1.2 we obey the JLS rules for binary |
| * compatibility, emitting as the qualifying type of a reference |
| * to a method or field the type of the qualifier. In earlier |
| * targets we use as the qualifying type the class in which the |
| * member was found. The following methods named |
| * *binaryCompatibility() indicate places where we vary from this |
| * general rule. */ |
| public boolean obeyBinaryCompatibility() { |
| return compareTo(JDK1_2) >= 0; |
| } |
| |
| /** Starting in 1.5, the compiler uses an array type as |
| * the qualifier for method calls (such as clone) where required by |
| * the language and VM spec. Earlier versions of the compiler |
| * qualified them by Object. |
| */ |
| public boolean arrayBinaryCompatibility() { |
| return compareTo(JDK1_5) >= 0; |
| } |
| |
| /** Beginning after 1.2, we follow the binary compatibility rules for |
| * interface fields. The 1.2 VMs had bugs handling interface fields |
| * when compiled using binary compatibility (see 4400598), so this is |
| * an accommodation to them. |
| */ |
| public boolean interfaceFieldsBinaryCompatibility() { |
| return compareTo(JDK1_2) > 0; |
| } |
| |
| /** Beginning in -target 1.5, we follow the binary compatibility |
| * rules for interface methods that redefine Object methods. |
| * Earlier VMs had bugs handling such methods compiled using binary |
| * compatibility (see 4392595, 4398791, 4392595, 4400415). |
| * The VMs were fixed during or soon after 1.4. See 4392595. |
| */ |
| public boolean interfaceObjectOverridesBinaryCompatibility() { |
| return compareTo(JDK1_5) >= 0; |
| } |
| |
| /** Beginning in -target 1.5, we make synthetic variables |
| * package-private instead of private. This is to prevent the |
| * necessity of access methods, which effectively relax the |
| * protection of the field but bloat the class files and affect |
| * execution. |
| */ |
| public boolean usePrivateSyntheticFields() { |
| return compareTo(JDK1_5) < 0; |
| } |
| |
| /** Sometimes we need to create a field to cache a value like a |
| * class literal of the assertions flag. In -target 1.5 and |
| * later we create a new synthetic class for this instead of |
| * using the outermost class. See 4401576. |
| */ |
| public boolean useInnerCacheClass() { |
| return compareTo(JDK1_5) >= 0; |
| } |
| |
| /** Return true if cldc-style stack maps need to be generated. */ |
| public boolean generateCLDCStackmap() { |
| return false; |
| } |
| |
| /** Beginning in -target 6, we generate stackmap attribute in |
| * compact format. */ |
| public boolean generateStackMapTable() { |
| return compareTo(JDK1_6) >= 0; |
| } |
| |
| /** Beginning in -target 6, package-info classes are marked synthetic. |
| */ |
| public boolean isPackageInfoSynthetic() { |
| return compareTo(JDK1_6) >= 0; |
| } |
| |
| /** Do we generate "empty" stackmap slots after double and long? |
| */ |
| public boolean generateEmptyAfterBig() { |
| return false; |
| } |
| |
| /** Beginning in 1.5, we have an unsynchronized version of |
| * StringBuffer called StringBuilder that can be used by the |
| * compiler for string concatenation. |
| */ |
| public boolean useStringBuilder() { |
| return compareTo(JDK1_5) >= 0; |
| } |
| |
| /** Beginning in 1.5, we have flag bits we can use instead of |
| * marker attributes. |
| */ |
| public boolean useSyntheticFlag() { |
| return compareTo(JDK1_5) >= 0; |
| } |
| public boolean useEnumFlag() { |
| return compareTo(JDK1_5) >= 0; |
| } |
| public boolean useAnnotationFlag() { |
| return compareTo(JDK1_5) >= 0; |
| } |
| public boolean useVarargsFlag() { |
| return compareTo(JDK1_5) >= 0; |
| } |
| public boolean useBridgeFlag() { |
| return compareTo(JDK1_5) >= 0; |
| } |
| |
| /** Return the character to be used in constructing synthetic |
| * identifiers, where not specified by the JLS. |
| */ |
| public char syntheticNameChar() { |
| return '$'; |
| } |
| |
| /** Does the VM have direct support for class literals? |
| */ |
| public boolean hasClassLiterals() { |
| return compareTo(JDK1_5) >= 0; |
| } |
| |
| /** Does the VM support an invokedynamic instruction? |
| */ |
| public boolean hasInvokedynamic() { |
| 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(); |
| } |
| |
| /** Although we may not have support for class literals, should we |
| * avoid initializing the class that the literal refers to? |
| * See 4468823 |
| */ |
| public boolean classLiteralsNoInit() { |
| return compareTo(JDK1_5) >= 0; |
| } |
| |
| /** Although we may not have support for class literals, when we |
| * throw a NoClassDefFoundError, should we initialize its cause? |
| */ |
| public boolean hasInitCause() { |
| return compareTo(JDK1_4) >= 0; |
| } |
| |
| /** For bootstrapping, we use J2SE1.4's wrapper class constructors |
| * to implement boxing. |
| */ |
| public boolean boxWithConstructors() { |
| return compareTo(JDK1_5) < 0; |
| } |
| |
| /** For bootstrapping, we use J2SE1.4's java.util.Collection |
| * instead of java.lang.Iterable. |
| */ |
| public boolean hasIterable() { |
| return compareTo(JDK1_5) >= 0; |
| } |
| |
| /** In J2SE1.5.0, we introduced the "EnclosingMethod" attribute |
| * for improved reflection support. |
| */ |
| public boolean hasEnclosingMethodAttribute() { |
| return compareTo(JDK1_5) >= 0; |
| } |
| } |