author | mcimadamore |
Wed, 17 Jul 2013 14:04:01 +0100 | |
changeset 18909 | 8f9fc5d876e4 |
parent 18411 | 58e11c41d705 |
child 19914 | d86271bd430a |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package com.sun.tools.javac.code; |
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import java.util.Collections; |
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import java.util.EnumSet; |
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import java.util.Map; |
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import java.util.Set; |
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import javax.lang.model.element.Modifier; |
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import com.sun.tools.javac.util.Assert; |
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/** Access flags and other modifiers for Java classes and members. |
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* |
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* <p><b>This is NOT part of any supported API. |
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* If you write code that depends on this, you do so at your own risk. |
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* This code and its internal interfaces are subject to change or |
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* deletion without notice.</b> |
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*/ |
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public class Flags { |
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private Flags() {} // uninstantiable |
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public static String toString(long flags) { |
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StringBuilder buf = new StringBuilder(); |
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String sep = ""; |
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for (Flag flag : asFlagSet(flags)) { |
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buf.append(sep); |
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buf.append(flag); |
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sep = " "; |
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} |
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return buf.toString(); |
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} |
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public static EnumSet<Flag> asFlagSet(long flags) { |
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EnumSet<Flag> flagSet = EnumSet.noneOf(Flag.class); |
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for (Flag flag : Flag.values()) { |
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if ((flags & flag.value) != 0) { |
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flagSet.add(flag); |
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flags &= ~flag.value; |
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} |
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} |
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Assert.check(flags == 0, "Flags parameter contains unknown flags " + flags); |
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return flagSet; |
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} |
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/* Standard Java flags. |
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*/ |
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public static final int PUBLIC = 1; |
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public static final int PRIVATE = 1<<1; |
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public static final int PROTECTED = 1<<2; |
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public static final int STATIC = 1<<3; |
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public static final int FINAL = 1<<4; |
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public static final int SYNCHRONIZED = 1<<5; |
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public static final int VOLATILE = 1<<6; |
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public static final int TRANSIENT = 1<<7; |
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public static final int NATIVE = 1<<8; |
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public static final int INTERFACE = 1<<9; |
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public static final int ABSTRACT = 1<<10; |
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public static final int STRICTFP = 1<<11; |
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/* Flag that marks a symbol synthetic, added in classfile v49.0. */ |
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public static final int SYNTHETIC = 1<<12; |
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/** Flag that marks attribute interfaces, added in classfile v49.0. */ |
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public static final int ANNOTATION = 1<<13; |
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/** An enumeration type or an enumeration constant, added in |
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* classfile v49.0. */ |
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public static final int ENUM = 1<<14; |
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/** Added in SE8, represents constructs implicitly declared in source. */ |
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public static final int MANDATED = 1<<15; |
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public static final int StandardFlags = 0x0fff; |
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public static final int ModifierFlags = StandardFlags & ~INTERFACE; |
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// Because the following access flags are overloaded with other |
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// bit positions, we translate them when reading and writing class |
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// files into unique bits positions: ACC_SYNTHETIC <-> SYNTHETIC, |
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// for example. |
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public static final int ACC_SUPER = 0x0020; |
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public static final int ACC_BRIDGE = 0x0040; |
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public static final int ACC_VARARGS = 0x0080; |
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/***************************************** |
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* Internal compiler flags (no bits in the lower 16). |
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*****************************************/ |
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/** Flag is set if symbol is deprecated. |
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*/ |
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public static final int DEPRECATED = 1<<17; |
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/** Flag is set for a variable symbol if the variable's definition |
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* has an initializer part. |
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*/ |
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public static final int HASINIT = 1<<18; |
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/** Flag is set for compiler-generated anonymous method symbols |
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* that `own' an initializer block. |
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*/ |
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public static final int BLOCK = 1<<20; |
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/** Flag is set for compiler-generated abstract methods that implement |
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* an interface method (Miranda methods). |
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*/ |
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public static final int IPROXY = 1<<21; |
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/** Flag is set for nested classes that do not access instance members |
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* or `this' of an outer class and therefore don't need to be passed |
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* a this$n reference. This value is currently set only for anonymous |
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* classes in superclass constructor calls and only for pre 1.4 targets. |
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* todo: use this value for optimizing away this$n parameters in |
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* other cases. |
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*/ |
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public static final int NOOUTERTHIS = 1<<22; |
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/** Flag is set for package symbols if a package has a member or |
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* directory and therefore exists. |
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*/ |
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public static final int EXISTS = 1<<23; |
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/** Flag is set for compiler-generated compound classes |
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* representing multiple variable bounds |
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*/ |
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public static final int COMPOUND = 1<<24; |
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/** Flag is set for class symbols if a class file was found for this class. |
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*/ |
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public static final int CLASS_SEEN = 1<<25; |
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/** Flag is set for class symbols if a source file was found for this |
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* class. |
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*/ |
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public static final int SOURCE_SEEN = 1<<26; |
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/* State flags (are reset during compilation). |
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*/ |
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/** Flag for class symbols is set and later re-set as a lock in |
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* Enter to detect cycles in the superclass/superinterface |
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* relations. Similarly for constructor call cycle detection in |
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* Attr. |
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*/ |
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public static final int LOCKED = 1<<27; |
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/** Flag for class symbols is set and later re-set to indicate that a class |
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* has been entered but has not yet been attributed. |
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*/ |
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public static final int UNATTRIBUTED = 1<<28; |
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/** Flag for synthesized default constructors of anonymous classes. |
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*/ |
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public static final int ANONCONSTR = 1<<29; |
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/** Flag for class symbols to indicate it has been checked and found |
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* acyclic. |
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*/ |
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public static final int ACYCLIC = 1<<30; |
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/** Flag that marks bridge methods. |
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*/ |
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public static final long BRIDGE = 1L<<31; |
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/** Flag that marks formal parameters. |
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*/ |
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public static final long PARAMETER = 1L<<33; |
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/** Flag that marks varargs methods. |
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*/ |
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public static final long VARARGS = 1L<<34; |
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/** Flag for annotation type symbols to indicate it has been |
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* checked and found acyclic. |
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*/ |
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public static final long ACYCLIC_ANN = 1L<<35; |
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/** Flag that marks a generated default constructor. |
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*/ |
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public static final long GENERATEDCONSTR = 1L<<36; |
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/** Flag that marks a hypothetical method that need not really be |
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* generated in the binary, but is present in the symbol table to |
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* simplify checking for erasure clashes - also used for 292 poly sig methods. |
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*/ |
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public static final long HYPOTHETICAL = 1L<<37; |
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/** |
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* Flag that marks an internal proprietary class. |
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*/ |
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public static final long PROPRIETARY = 1L<<38; |
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/** |
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* Flag that marks a multi-catch parameter. |
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*/ |
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public static final long UNION = 1L<<39; |
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/** |
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* Flag that marks a special kind of bridge method (the ones that |
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* come from restricted supertype bounds). |
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*/ |
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public static final long OVERRIDE_BRIDGE = 1L<<40; |
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/** |
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* Flag that marks an 'effectively final' local variable. |
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*/ |
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public static final long EFFECTIVELY_FINAL = 1L<<41; |
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/** |
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* Flag that marks non-override equivalent methods with the same signature. |
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*/ |
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public static final long CLASH = 1L<<42; |
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/** |
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* Flag that marks either a default method or an interface containing default methods. |
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*/ |
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public static final long DEFAULT = 1L<<43; |
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/** |
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* Flag that marks class as auxiliary, ie a non-public class following |
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* the public class in a source file, that could block implicit compilation. |
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*/ |
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public static final long AUXILIARY = 1L<<44; |
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/** |
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* Flag that marks that a symbol is not available in the current profile |
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*/ |
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public static final long NOT_IN_PROFILE = 1L<<45; |
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/** |
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* Flag that indicates that an override error has been detected by Check. |
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*/ |
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public static final long BAD_OVERRIDE = 1L<<45; |
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/** |
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* Flag that indicates a signature polymorphic method (292). |
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*/ |
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public static final long SIGNATURE_POLYMORPHIC = 1L<<46; |
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/** |
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* Flag that marks inference variables used in a 'throws' clause |
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*/ |
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public static final long THROWS = 1L<<47; |
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/** Modifier masks. |
270 |
*/ |
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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, |
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276 |
InterfaceVarFlags = FINAL | STATIC | PUBLIC, |
|
277 |
VarFlags = AccessFlags | FINAL | STATIC | |
|
278 |
VOLATILE | TRANSIENT | ENUM, |
|
279 |
ConstructorFlags = AccessFlags, |
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280 |
InterfaceMethodFlags = ABSTRACT | PUBLIC, |
|
281 |
MethodFlags = AccessFlags | ABSTRACT | STATIC | NATIVE | |
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282 |
SYNCHRONIZED | FINAL | STRICTFP; |
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283 |
public static final long |
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ExtendedStandardFlags = (long)StandardFlags | DEFAULT, |
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InterfaceMethodMask = ABSTRACT | STATIC | PUBLIC | STRICTFP | DEFAULT, |
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LocalVarFlags = FINAL | PARAMETER; |
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|
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|
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); |
|
16803 | 305 |
if (0 != (flags & DEFAULT)) modifiers.add(Modifier.DEFAULT); |
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modifiers = Collections.unmodifiableSet(modifiers); |
307 |
modifierSets.put(flags, modifiers); |
|
308 |
} |
|
309 |
return modifiers; |
|
310 |
} |
|
311 |
||
312 |
// Cache of modifier sets. |
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private static final Map<Long, Set<Modifier>> modifierSets = |
10 | 314 |
new java.util.concurrent.ConcurrentHashMap<Long, Set<Modifier>>(64); |
315 |
||
316 |
public static boolean isStatic(Symbol symbol) { |
|
317 |
return (symbol.flags() & STATIC) != 0; |
|
318 |
} |
|
319 |
||
320 |
public static boolean isEnum(Symbol symbol) { |
|
321 |
return (symbol.flags() & ENUM) != 0; |
|
322 |
} |
|
323 |
||
324 |
public static boolean isConstant(Symbol.VarSymbol symbol) { |
|
325 |
return symbol.getConstValue() != null; |
|
326 |
} |
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327 |
|
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328 |
|
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public enum Flag { |
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PUBLIC(Flags.PUBLIC), |
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PRIVATE(Flags.PRIVATE), |
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PROTECTED(Flags.PROTECTED), |
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STATIC(Flags.STATIC), |
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FINAL(Flags.FINAL), |
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SYNCHRONIZED(Flags.SYNCHRONIZED), |
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VOLATILE(Flags.VOLATILE), |
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TRANSIENT(Flags.TRANSIENT), |
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NATIVE(Flags.NATIVE), |
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INTERFACE(Flags.INTERFACE), |
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ABSTRACT(Flags.ABSTRACT), |
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DEFAULT(Flags.DEFAULT), |
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STRICTFP(Flags.STRICTFP), |
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BRIDGE(Flags.BRIDGE), |
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SYNTHETIC(Flags.SYNTHETIC), |
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ANNOTATION(Flags.ANNOTATION), |
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DEPRECATED(Flags.DEPRECATED), |
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HASINIT(Flags.HASINIT), |
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BLOCK(Flags.BLOCK), |
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ENUM(Flags.ENUM), |
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350 |
MANDATED(Flags.MANDATED), |
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351 |
IPROXY(Flags.IPROXY), |
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NOOUTERTHIS(Flags.NOOUTERTHIS), |
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EXISTS(Flags.EXISTS), |
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COMPOUND(Flags.COMPOUND), |
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355 |
CLASS_SEEN(Flags.CLASS_SEEN), |
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356 |
SOURCE_SEEN(Flags.SOURCE_SEEN), |
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357 |
LOCKED(Flags.LOCKED), |
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358 |
UNATTRIBUTED(Flags.UNATTRIBUTED), |
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359 |
ANONCONSTR(Flags.ANONCONSTR), |
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360 |
ACYCLIC(Flags.ACYCLIC), |
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361 |
PARAMETER(Flags.PARAMETER), |
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362 |
VARARGS(Flags.VARARGS), |
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363 |
ACYCLIC_ANN(Flags.ACYCLIC_ANN), |
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364 |
GENERATEDCONSTR(Flags.GENERATEDCONSTR), |
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365 |
HYPOTHETICAL(Flags.HYPOTHETICAL), |
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366 |
PROPRIETARY(Flags.PROPRIETARY), |
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367 |
UNION(Flags.UNION), |
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368 |
OVERRIDE_BRIDGE(Flags.OVERRIDE_BRIDGE), |
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369 |
EFFECTIVELY_FINAL(Flags.EFFECTIVELY_FINAL), |
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370 |
CLASH(Flags.CLASH), |
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371 |
AUXILIARY(Flags.AUXILIARY), |
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372 |
NOT_IN_PROFILE(Flags.NOT_IN_PROFILE), |
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373 |
BAD_OVERRIDE(Flags.BAD_OVERRIDE), |
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374 |
SIGNATURE_POLYMORPHIC(Flags.SIGNATURE_POLYMORPHIC), |
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375 |
THROWS(Flags.THROWS); |
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376 |
|
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377 |
Flag(long flag) { |
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378 |
this.value = flag; |
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379 |
this.lowercaseName = name().toLowerCase(); |
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380 |
} |
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381 |
|
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382 |
@Override |
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383 |
public String toString() { |
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384 |
return lowercaseName; |
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385 |
} |
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386 |
|
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387 |
final long value; |
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388 |
final String lowercaseName; |
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389 |
} |
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390 |
|
10 | 391 |
} |