langtools/src/share/classes/com/sun/tools/javac/jvm/Target.java - platform/libcore - Git at Google

 /*
  * 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;
     }
 }
	/*
	* 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;
	}
	}