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

 /*

  * Copyright 1999-2006 Sun Microsystems, Inc.  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.  Sun designates this

  * particular file as subject to the "Classpath" exception as provided

  * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

  * CA 95054 USA or visit www.sun.com if you need additional information or

  * have any questions.

  */

 package com.sun.tools.javac.code;

 import java.util.Collections;

 import java.util.Map;

 import java.util.Set;

 import javax.lang.model.element.Modifier;

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

  *

  *  <p><b>This is NOT part of any API supported by Sun Microsystems.  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) {

         StringBuffer buf = new StringBuffer();

         if ((flags&PUBLIC) != 0) buf.append("public ");

         if ((flags&PRIVATE) != 0) buf.append("private ");

         if ((flags&PROTECTED) != 0) buf.append("protected ");

         if ((flags&STATIC) != 0) buf.append("static ");

         if ((flags&FINAL) != 0) buf.append("final ");

         if ((flags&SYNCHRONIZED) != 0) buf.append("synchronized ");

         if ((flags&VOLATILE) != 0) buf.append("volatile ");

         if ((flags&TRANSIENT) != 0) buf.append("transient ");

         if ((flags&NATIVE) != 0) buf.append("native ");

         if ((flags&INTERFACE) != 0) buf.append("interface ");

         if ((flags&ABSTRACT) != 0) buf.append("abstract ");

         if ((flags&STRICTFP) != 0) buf.append("strictfp ");

         if ((flags&BRIDGE) != 0) buf.append("bridge ");

         if ((flags&SYNTHETIC) != 0) buf.append("synthetic ");

         if ((flags&DEPRECATED) != 0) buf.append("deprecated ");

         if ((flags&HASINIT) != 0) buf.append("hasinit ");

         if ((flags&ENUM) != 0) buf.append("enum ");

         if ((flags&IPROXY) != 0) buf.append("iproxy ");

         if ((flags&NOOUTERTHIS) != 0) buf.append("noouterthis ");

         if ((flags&EXISTS) != 0) buf.append("exists ");

         if ((flags&COMPOUND) != 0) buf.append("compound ");

         if ((flags&CLASS_SEEN) != 0) buf.append("class_seen ");

         if ((flags&SOURCE_SEEN) != 0) buf.append("source_seen ");

         if ((flags&LOCKED) != 0) buf.append("locked ");

         if ((flags&UNATTRIBUTED) != 0) buf.append("unattributed ");

         if ((flags&ANONCONSTR) != 0) buf.append("anonconstr ");

         if ((flags&ACYCLIC) != 0) buf.append("acyclic ");

         if ((flags&PARAMETER) != 0) buf.append("parameter ");

         if ((flags&VARARGS) != 0) buf.append("varargs ");

         return buf.toString();

     }

     /* Standard Java flags.

      */

     public static final int PUBLIC       = 1<<0;

     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;

     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 flag is currently set only for anonymous

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

      *  todo: use this flag 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.

      */

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

     /**

      * Flag that marks a Sun proprietary class.

      */

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

     /** 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

         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);

             modifiers = Collections.unmodifiableSet(modifiers);

             modifierSets.put(flags, modifiers);

         }

         return modifiers;

     }

     // Cache of modifier sets.

     private static 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;

     }

 }