Mercurial > jdk8-mips64-public > langtools / file revision

 /*

  * Copyright (c) 1999, 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

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  */

 package com.sun.tools.javac.code;

 import java.util.Collections;

 import java.util.EnumSet;

 import java.util.Map;

 import java.util.Set;

 import javax.lang.model.element.Modifier;

 import com.sun.tools.javac.util.Assert;

 /** Access flags and other modifiers for Java classes and members.

  *

  *  <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 class Flags {

     private Flags() {} // uninstantiable

     public static String toString(long flags) {

         StringBuilder buf = new StringBuilder();

         String sep = "";

         for (Flag flag : asFlagSet(flags)) {

             buf.append(sep);

             buf.append(flag);

             sep = " ";

         }

         return buf.toString();

     }

     public static EnumSet<Flag> asFlagSet(long flags) {

         EnumSet<Flag> flagSet = EnumSet.noneOf(Flag.class);

         for (Flag flag : Flag.values()) {

             if ((flags & flag.value) != 0) {

                 flagSet.add(flag);

                 flags &= ~flag.value;

             }

         }

         Assert.check(flags == 0, "Flags parameter contains unknown flags " + flags);

         return flagSet;

     }

     /* Standard Java flags.

      */

     public static final int PUBLIC       = 1;

     public static final int PRIVATE      = 1<<1;

     public static final int PROTECTED    = 1<<2;

     public static final int STATIC       = 1<<3;

     public static final int FINAL        = 1<<4;

     public static final int SYNCHRONIZED = 1<<5;

     public static final int VOLATILE     = 1<<6;

     public static final int TRANSIENT    = 1<<7;

     public static final int NATIVE       = 1<<8;

     public static final int INTERFACE    = 1<<9;

     public static final int ABSTRACT     = 1<<10;

     public static final int STRICTFP     = 1<<11;

     /* Flag that marks a symbol synthetic, added in classfile v49.0. */

     public static final int SYNTHETIC    = 1<<12;

     /** Flag that marks attribute interfaces, added in classfile v49.0. */

     public static final int ANNOTATION   = 1<<13;

     /** An enumeration type or an enumeration constant, added in

      *  classfile v49.0. */

     public static final int ENUM         = 1<<14;

     /** Added in SE8, represents constructs implicitly declared in source. */

     public static final int MANDATED     = 1<<15;

     public static final int StandardFlags = 0x0fff;

     // Because the following access flags are overloaded with other

     // bit positions, we translate them when reading and writing class

     // files into unique bits positions: ACC_SYNTHETIC <-> SYNTHETIC,

     // for example.

     public static final int ACC_SUPER    = 0x0020;

     public static final int ACC_BRIDGE   = 0x0040;

     public static final int ACC_VARARGS  = 0x0080;

     /*****************************************

      * Internal compiler flags (no bits in the lower 16).

      *****************************************/

     /** Flag is set if symbol is deprecated.

      */

     public static final int DEPRECATED   = 1<<17;

     /** Flag is set for a variable symbol if the variable's definition

      *  has an initializer part.

      */

     public static final int HASINIT          = 1<<18;

     /** Flag is set for compiler-generated anonymous method symbols

      *  that `own' an initializer block.

      */

     public static final int BLOCK            = 1<<20;

     /** Flag is set for compiler-generated abstract methods that implement

      *  an interface method (Miranda methods).

      */

     public static final int IPROXY           = 1<<21;

     /** Flag is set for nested classes that do not access instance members

      *  or `this' of an outer class and therefore don't need to be passed

      *  a this$n reference.  This value is currently set only for anonymous

      *  classes in superclass constructor calls and only for pre 1.4 targets.

      *  todo: use this value for optimizing away this$n parameters in

      *  other cases.

      */

     public static final int NOOUTERTHIS  = 1<<22;

     /** Flag is set for package symbols if a package has a member or

      *  directory and therefore exists.

      */

     public static final int EXISTS           = 1<<23;

     /** Flag is set for compiler-generated compound classes

      *  representing multiple variable bounds

      */

     public static final int COMPOUND     = 1<<24;

     /** Flag is set for class symbols if a class file was found for this class.

      */

     public static final int CLASS_SEEN   = 1<<25;

     /** Flag is set for class symbols if a source file was found for this

      *  class.

      */

     public static final int SOURCE_SEEN  = 1<<26;

     /* State flags (are reset during compilation).

      */

     /** Flag for class symbols is set and later re-set as a lock in

      *  Enter to detect cycles in the superclass/superinterface

      *  relations.  Similarly for constructor call cycle detection in

      *  Attr.

      */

     public static final int LOCKED           = 1<<27;

     /** Flag for class symbols is set and later re-set to indicate that a class

      *  has been entered but has not yet been attributed.

      */

     public static final int UNATTRIBUTED = 1<<28;

     /** Flag for synthesized default constructors of anonymous classes.

      */

     public static final int ANONCONSTR   = 1<<29;

     /** Flag for class symbols to indicate it has been checked and found

      *  acyclic.

      */

     public static final int ACYCLIC          = 1<<30;

     /** Flag that marks bridge methods.

      */

     public static final long BRIDGE          = 1L<<31;

     /** Flag that marks formal parameters.

      */

     public static final long PARAMETER   = 1L<<33;

     /** Flag that marks varargs methods.

      */

     public static final long VARARGS   = 1L<<34;

     /** Flag for annotation type symbols to indicate it has been

      *  checked and found acyclic.

      */

     public static final long ACYCLIC_ANN      = 1L<<35;

     /** Flag that marks a generated default constructor.

      */

     public static final long GENERATEDCONSTR   = 1L<<36;

     /** Flag that marks a hypothetical method that need not really be

      *  generated in the binary, but is present in the symbol table to

      *  simplify checking for erasure clashes - also used for 292 poly sig methods.

      */

     public static final long HYPOTHETICAL   = 1L<<37;

     /**

      * Flag that marks an internal proprietary class.

      */

     public static final long PROPRIETARY = 1L<<38;

     /**

      * Flag that marks a multi-catch parameter.

      */

     public static final long UNION = 1L<<39;

     /**

      * Flag that marks a special kind of bridge method (the ones that

      * come from restricted supertype bounds).

      */

     public static final long OVERRIDE_BRIDGE = 1L<<40;

     /**

      * Flag that marks an 'effectively final' local variable.

      */

     public static final long EFFECTIVELY_FINAL = 1L<<41;

     /**

      * Flag that marks non-override equivalent methods with the same signature.

      */

     public static final long CLASH = 1L<<42;

     /**

      * Flag that marks either a default method or an interface containing default methods.

      */

     public static final long DEFAULT = 1L<<43;

     /**

      * Flag that marks class as auxiliary, ie a non-public class following

      * the public class in a source file, that could block implicit compilation.

      */

     public static final long AUXILIARY = 1L<<44;

     /**

      * Flag that marks that a symbol is not available in the current profile

      */

     public static final long NOT_IN_PROFILE = 1L<<45;

     /**

      * Flag that indicates that an override error has been detected by Check.

      */

     public static final long BAD_OVERRIDE = 1L<<45;

     /**

      * Flag that indicates a signature polymorphic method (292).

      */

     public static final long SIGNATURE_POLYMORPHIC = 1L<<46;

     /**

      * Flag that indicates that an inference variable is used in a 'throws' clause.

      */

     public static final long THROWS = 1L<<47;

     /**

      * Flag that marks potentially ambiguous overloads

      */

     public static final long POTENTIALLY_AMBIGUOUS = 1L<<48;

     /** Modifier masks.

      */

     public static final int

         AccessFlags           = PUBLIC | PROTECTED | PRIVATE,

         LocalClassFlags       = FINAL | ABSTRACT | STRICTFP | ENUM | SYNTHETIC,

         MemberClassFlags      = LocalClassFlags | INTERFACE | AccessFlags,

         ClassFlags            = LocalClassFlags | INTERFACE | PUBLIC | ANNOTATION,

         InterfaceVarFlags     = FINAL | STATIC | PUBLIC,

         VarFlags              = AccessFlags | FINAL | STATIC |

                                 VOLATILE | TRANSIENT | ENUM,

         ConstructorFlags      = AccessFlags,

         InterfaceMethodFlags  = ABSTRACT | PUBLIC,

         MethodFlags           = AccessFlags | ABSTRACT | STATIC | NATIVE |

                                 SYNCHRONIZED | FINAL | STRICTFP;

     public static final long

         ExtendedStandardFlags       = (long)StandardFlags | DEFAULT,

         ModifierFlags               = ((long)StandardFlags & ~INTERFACE) | DEFAULT,

         InterfaceMethodMask         = ABSTRACT | STATIC | PUBLIC | STRICTFP | DEFAULT,

         AnnotationTypeElementMask   = FINAL | ABSTRACT | PUBLIC | STRICTFP,

         LocalVarFlags               = FINAL | PARAMETER;

     public static Set<Modifier> asModifierSet(long flags) {

         Set<Modifier> modifiers = modifierSets.get(flags);

         if (modifiers == null) {

             modifiers = java.util.EnumSet.noneOf(Modifier.class);

             if (0 != (flags & PUBLIC))    modifiers.add(Modifier.PUBLIC);

             if (0 != (flags & PROTECTED)) modifiers.add(Modifier.PROTECTED);

             if (0 != (flags & PRIVATE))   modifiers.add(Modifier.PRIVATE);

             if (0 != (flags & ABSTRACT))  modifiers.add(Modifier.ABSTRACT);

             if (0 != (flags & STATIC))    modifiers.add(Modifier.STATIC);

             if (0 != (flags & FINAL))     modifiers.add(Modifier.FINAL);

             if (0 != (flags & TRANSIENT)) modifiers.add(Modifier.TRANSIENT);

             if (0 != (flags & VOLATILE))  modifiers.add(Modifier.VOLATILE);

             if (0 != (flags & SYNCHRONIZED))

                                           modifiers.add(Modifier.SYNCHRONIZED);

             if (0 != (flags & NATIVE))    modifiers.add(Modifier.NATIVE);

             if (0 != (flags & STRICTFP))  modifiers.add(Modifier.STRICTFP);

             if (0 != (flags & DEFAULT))   modifiers.add(Modifier.DEFAULT);

             modifiers = Collections.unmodifiableSet(modifiers);

             modifierSets.put(flags, modifiers);

         }

         return modifiers;

     }

     // Cache of modifier sets.

     private static final Map<Long, Set<Modifier>> modifierSets =

         new java.util.concurrent.ConcurrentHashMap<Long, Set<Modifier>>(64);

     public static boolean isStatic(Symbol symbol) {

         return (symbol.flags() & STATIC) != 0;

     }

     public static boolean isEnum(Symbol symbol) {

         return (symbol.flags() & ENUM) != 0;

     }

     public static boolean isConstant(Symbol.VarSymbol symbol) {

         return symbol.getConstValue() != null;

     }

     public enum Flag {

         PUBLIC(Flags.PUBLIC),

         PRIVATE(Flags.PRIVATE),

         PROTECTED(Flags.PROTECTED),

         STATIC(Flags.STATIC),

         FINAL(Flags.FINAL),

         SYNCHRONIZED(Flags.SYNCHRONIZED),

         VOLATILE(Flags.VOLATILE),

         TRANSIENT(Flags.TRANSIENT),

         NATIVE(Flags.NATIVE),

         INTERFACE(Flags.INTERFACE),

         ABSTRACT(Flags.ABSTRACT),

         DEFAULT(Flags.DEFAULT),

         STRICTFP(Flags.STRICTFP),

         BRIDGE(Flags.BRIDGE),

         SYNTHETIC(Flags.SYNTHETIC),

         ANNOTATION(Flags.ANNOTATION),

         DEPRECATED(Flags.DEPRECATED),

         HASINIT(Flags.HASINIT),

         BLOCK(Flags.BLOCK),

         ENUM(Flags.ENUM),

         MANDATED(Flags.MANDATED),

         IPROXY(Flags.IPROXY),

         NOOUTERTHIS(Flags.NOOUTERTHIS),

         EXISTS(Flags.EXISTS),

         COMPOUND(Flags.COMPOUND),

         CLASS_SEEN(Flags.CLASS_SEEN),

         SOURCE_SEEN(Flags.SOURCE_SEEN),

         LOCKED(Flags.LOCKED),

         UNATTRIBUTED(Flags.UNATTRIBUTED),

         ANONCONSTR(Flags.ANONCONSTR),

         ACYCLIC(Flags.ACYCLIC),

         PARAMETER(Flags.PARAMETER),

         VARARGS(Flags.VARARGS),

         ACYCLIC_ANN(Flags.ACYCLIC_ANN),

         GENERATEDCONSTR(Flags.GENERATEDCONSTR),

         HYPOTHETICAL(Flags.HYPOTHETICAL),

         PROPRIETARY(Flags.PROPRIETARY),

         UNION(Flags.UNION),

         OVERRIDE_BRIDGE(Flags.OVERRIDE_BRIDGE),

         EFFECTIVELY_FINAL(Flags.EFFECTIVELY_FINAL),

         CLASH(Flags.CLASH),

         AUXILIARY(Flags.AUXILIARY),

         NOT_IN_PROFILE(Flags.NOT_IN_PROFILE),

         BAD_OVERRIDE(Flags.BAD_OVERRIDE),

         SIGNATURE_POLYMORPHIC(Flags.SIGNATURE_POLYMORPHIC),

         THROWS(Flags.THROWS);

         Flag(long flag) {

             this.value = flag;

             this.lowercaseName = name().toLowerCase();

         }

         @Override

         public String toString() {

             return lowercaseName;

         }

         final long value;

         final String lowercaseName;

     }

 }