jdk8-mips64-public/langtools: src/share/classes/com/sun/tools/javac/code/Flags.java@44e27378f523

8012242: Lambda compatibility and checked exceptions
Summary: Inference variables in 'throws' clause with no constraints should be inferred as RuntimeException
Reviewed-by: jjg, vromero

     1 /*

     2  * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Oracle designates this

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

     9  * by Oracle in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    22  * or visit www.oracle.com if you need additional information or have any

    23  * questions.

    24  */

    26 package com.sun.tools.javac.code;

    28 import java.util.Collections;

    29 import java.util.EnumSet;

    30 import java.util.Map;

    31 import java.util.Set;

    33 import javax.lang.model.element.Modifier;

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

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

    38  *

    39  *  <p><b>This is NOT part of any supported API.

    40  *  If you write code that depends on this, you do so at your own risk.

    41  *  This code and its internal interfaces are subject to change or

    42  *  deletion without notice.</b>

    43  */

    44 public class Flags {

    46     private Flags() {} // uninstantiable

    48     public static String toString(long flags) {

    49         StringBuilder buf = new StringBuilder();

    50         String sep = "";

    51         for (Flag flag : asFlagSet(flags)) {

    52             buf.append(sep);

    53             buf.append(flag);

    54             sep = " ";

    55         }

    56         return buf.toString();

    57     }

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

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

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

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

    63                 flagSet.add(flag);

    64                 flags &= ~flag.value;

    65             }

    66         }

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

    68         return flagSet;

    69     }

    71     /* Standard Java flags.

    72      */

    73     public static final int PUBLIC       = 1;

    74     public static final int PRIVATE      = 1<<1;

    75     public static final int PROTECTED    = 1<<2;

    76     public static final int STATIC       = 1<<3;

    77     public static final int FINAL        = 1<<4;

    78     public static final int SYNCHRONIZED = 1<<5;

    79     public static final int VOLATILE     = 1<<6;

    80     public static final int TRANSIENT    = 1<<7;

    81     public static final int NATIVE       = 1<<8;

    82     public static final int INTERFACE    = 1<<9;

    83     public static final int ABSTRACT     = 1<<10;

    84     public static final int STRICTFP     = 1<<11;

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

    87     public static final int SYNTHETIC    = 1<<12;

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

    90     public static final int ANNOTATION   = 1<<13;

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

    93      *  classfile v49.0. */

    94     public static final int ENUM         = 1<<14;

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

    97     public static final int MANDATED     = 1<<15;

    99     public static final int StandardFlags = 0x0fff;

   100     public static final int ModifierFlags = StandardFlags & ~INTERFACE;

   102     // Because the following access flags are overloaded with other

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

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

   105     // for example.

   106     public static final int ACC_SUPER    = 0x0020;

   107     public static final int ACC_BRIDGE   = 0x0040;

   108     public static final int ACC_VARARGS  = 0x0080;

   110     /*****************************************

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

   112      *****************************************/

   114     /** Flag is set if symbol is deprecated.

   115      */

   116     public static final int DEPRECATED   = 1<<17;

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

   119      *  has an initializer part.

   120      */

   121     public static final int HASINIT          = 1<<18;

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

   124      *  that `own' an initializer block.

   125      */

   126     public static final int BLOCK            = 1<<20;

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

   129      *  an interface method (Miranda methods).

   130      */

   131     public static final int IPROXY           = 1<<21;

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

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

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

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

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

   138      *  other cases.

   139      */

   140     public static final int NOOUTERTHIS  = 1<<22;

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

   143      *  directory and therefore exists.

   144      */

   145     public static final int EXISTS           = 1<<23;

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

   148      *  representing multiple variable bounds

   149      */

   150     public static final int COMPOUND     = 1<<24;

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

   153      */

   154     public static final int CLASS_SEEN   = 1<<25;

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

   157      *  class.

   158      */

   159     public static final int SOURCE_SEEN  = 1<<26;

   161     /* State flags (are reset during compilation).

   162      */

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

   165      *  Enter to detect cycles in the superclass/superinterface

   166      *  relations.  Similarly for constructor call cycle detection in

   167      *  Attr.

   168      */

   169     public static final int LOCKED           = 1<<27;

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

   172      *  has been entered but has not yet been attributed.

   173      */

   174     public static final int UNATTRIBUTED = 1<<28;

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

   177      */

   178     public static final int ANONCONSTR   = 1<<29;

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

   181      *  acyclic.

   182      */

   183     public static final int ACYCLIC          = 1<<30;

   185     /** Flag that marks bridge methods.

   186      */

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

   189     /** Flag that marks formal parameters.

   190      */

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

   193     /** Flag that marks varargs methods.

   194      */

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

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

   198      *  checked and found acyclic.

   199      */

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

   202     /** Flag that marks a generated default constructor.

   203      */

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

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

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

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

   209      */

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

   212     /**

   213      * Flag that marks an internal proprietary class.

   214      */

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

   217     /**

   218      * Flag that marks a multi-catch parameter.

   219      */

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

   222     /**

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

   224      * come from restricted supertype bounds).

   225      */

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

   228     /**

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

   230      */

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

   233     /**

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

   235      */

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

   238     /**

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

   240      */

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

   243     /**

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

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

   246      */

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

   249     /**

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

   251      */

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

   254     /**

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

   256      */

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

   259     /**

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

   261      */

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

   264     /**

   265      * Flag that marks inference variables used in a 'throws' clause

   266      */

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

   269     /** Modifier masks.

   270      */

   271     public static final int

   272         AccessFlags           = PUBLIC | PROTECTED | PRIVATE,

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

   274         MemberClassFlags      = LocalClassFlags | INTERFACE | AccessFlags,

   275         ClassFlags            = LocalClassFlags | INTERFACE | PUBLIC | ANNOTATION,

   276         InterfaceVarFlags     = FINAL | STATIC | PUBLIC,

   277         VarFlags              = AccessFlags | FINAL | STATIC |

   278                                 VOLATILE | TRANSIENT | ENUM,

   279         ConstructorFlags      = AccessFlags,

   280         InterfaceMethodFlags  = ABSTRACT | PUBLIC,

   281         MethodFlags           = AccessFlags | ABSTRACT | STATIC | NATIVE |

   282                                 SYNCHRONIZED | FINAL | STRICTFP;

   283     public static final long

   284         ExtendedStandardFlags       = (long)StandardFlags | DEFAULT,

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

   286         LocalVarFlags               = FINAL | PARAMETER;

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

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

   291         if (modifiers == null) {

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

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

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

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

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

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

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

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

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

   301             if (0 != (flags & SYNCHRONIZED))

   302                                           modifiers.add(Modifier.SYNCHRONIZED);

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

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

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

   306             modifiers = Collections.unmodifiableSet(modifiers);

   307             modifierSets.put(flags, modifiers);

   308         }

   309         return modifiers;

   310     }

   312     // Cache of modifier sets.

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

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

   316     public static boolean isStatic(Symbol symbol) {

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

   318     }

   320     public static boolean isEnum(Symbol symbol) {

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

   322     }

   324     public static boolean isConstant(Symbol.VarSymbol symbol) {

   325         return symbol.getConstValue() != null;

   326     }

   329     public enum Flag {

   330         PUBLIC(Flags.PUBLIC),

   331         PRIVATE(Flags.PRIVATE),

   332         PROTECTED(Flags.PROTECTED),

   333         STATIC(Flags.STATIC),

   334         FINAL(Flags.FINAL),

   335         SYNCHRONIZED(Flags.SYNCHRONIZED),

   336         VOLATILE(Flags.VOLATILE),

   337         TRANSIENT(Flags.TRANSIENT),

   338         NATIVE(Flags.NATIVE),

   339         INTERFACE(Flags.INTERFACE),

   340         ABSTRACT(Flags.ABSTRACT),

   341         DEFAULT(Flags.DEFAULT),

   342         STRICTFP(Flags.STRICTFP),

   343         BRIDGE(Flags.BRIDGE),

   344         SYNTHETIC(Flags.SYNTHETIC),

   345         ANNOTATION(Flags.ANNOTATION),

   346         DEPRECATED(Flags.DEPRECATED),

   347         HASINIT(Flags.HASINIT),

   348         BLOCK(Flags.BLOCK),

   349         ENUM(Flags.ENUM),

   350         MANDATED(Flags.MANDATED),

   351         IPROXY(Flags.IPROXY),

   352         NOOUTERTHIS(Flags.NOOUTERTHIS),

   353         EXISTS(Flags.EXISTS),

   354         COMPOUND(Flags.COMPOUND),

   355         CLASS_SEEN(Flags.CLASS_SEEN),

   356         SOURCE_SEEN(Flags.SOURCE_SEEN),

   357         LOCKED(Flags.LOCKED),

   358         UNATTRIBUTED(Flags.UNATTRIBUTED),

   359         ANONCONSTR(Flags.ANONCONSTR),

   360         ACYCLIC(Flags.ACYCLIC),

   361         PARAMETER(Flags.PARAMETER),

   362         VARARGS(Flags.VARARGS),

   363         ACYCLIC_ANN(Flags.ACYCLIC_ANN),

   364         GENERATEDCONSTR(Flags.GENERATEDCONSTR),

   365         HYPOTHETICAL(Flags.HYPOTHETICAL),

   366         PROPRIETARY(Flags.PROPRIETARY),

   367         UNION(Flags.UNION),

   368         OVERRIDE_BRIDGE(Flags.OVERRIDE_BRIDGE),

   369         EFFECTIVELY_FINAL(Flags.EFFECTIVELY_FINAL),

   370         CLASH(Flags.CLASH),

   371         AUXILIARY(Flags.AUXILIARY),

   372         NOT_IN_PROFILE(Flags.NOT_IN_PROFILE),

   373         BAD_OVERRIDE(Flags.BAD_OVERRIDE),

   374         SIGNATURE_POLYMORPHIC(Flags.SIGNATURE_POLYMORPHIC),

   375         THROWS(Flags.THROWS);

   377         Flag(long flag) {

   378             this.value = flag;

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

   380         }

   382         @Override

   383         public String toString() {

   384             return lowercaseName;

   385         }

   387         final long value;

   388         final String lowercaseName;

   389     }

   391 }

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

src/share/classes/com/sun/tools/javac/code/Flags.java@44e27378f523

src/share/classes/com/sun/tools/javac/code/Flags.java