author | mcimadamore |
Mon, 21 Jan 2013 20:13:56 +0000 | |
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parent 14801 | d66cab4ef397 |
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child 15724 | 3063fb01c8a1 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1999, 2012, 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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/** 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 s : asFlagSet(flags)) { |
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buf.append(sep); |
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buf.append(s); |
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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 mask) { |
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EnumSet<Flag> flags = EnumSet.noneOf(Flag.class); |
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if ((mask&PUBLIC) != 0) flags.add(Flag.PUBLIC); |
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if ((mask&PRIVATE) != 0) flags.add(Flag.PRIVATE); |
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if ((mask&PROTECTED) != 0) flags.add(Flag.PROTECTED); |
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if ((mask&STATIC) != 0) flags.add(Flag.STATIC); |
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if ((mask&FINAL) != 0) flags.add(Flag.FINAL); |
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if ((mask&SYNCHRONIZED) != 0) flags.add(Flag.SYNCHRONIZED); |
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if ((mask&VOLATILE) != 0) flags.add(Flag.VOLATILE); |
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if ((mask&TRANSIENT) != 0) flags.add(Flag.TRANSIENT); |
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if ((mask&NATIVE) != 0) flags.add(Flag.NATIVE); |
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if ((mask&INTERFACE) != 0) flags.add(Flag.INTERFACE); |
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if ((mask&ABSTRACT) != 0) flags.add(Flag.ABSTRACT); |
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if ((mask&DEFAULT) != 0) flags.add(Flag.DEFAULT); |
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if ((mask&STRICTFP) != 0) flags.add(Flag.STRICTFP); |
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if ((mask&BRIDGE) != 0) flags.add(Flag.BRIDGE); |
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if ((mask&SYNTHETIC) != 0) flags.add(Flag.SYNTHETIC); |
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if ((mask&DEPRECATED) != 0) flags.add(Flag.DEPRECATED); |
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if ((mask&HASINIT) != 0) flags.add(Flag.HASINIT); |
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if ((mask&ENUM) != 0) flags.add(Flag.ENUM); |
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if ((mask&IPROXY) != 0) flags.add(Flag.IPROXY); |
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if ((mask&NOOUTERTHIS) != 0) flags.add(Flag.NOOUTERTHIS); |
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if ((mask&EXISTS) != 0) flags.add(Flag.EXISTS); |
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if ((mask&COMPOUND) != 0) flags.add(Flag.COMPOUND); |
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if ((mask&CLASS_SEEN) != 0) flags.add(Flag.CLASS_SEEN); |
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if ((mask&SOURCE_SEEN) != 0) flags.add(Flag.SOURCE_SEEN); |
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if ((mask&LOCKED) != 0) flags.add(Flag.LOCKED); |
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if ((mask&UNATTRIBUTED) != 0) flags.add(Flag.UNATTRIBUTED); |
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if ((mask&ANONCONSTR) != 0) flags.add(Flag.ANONCONSTR); |
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if ((mask&ACYCLIC) != 0) flags.add(Flag.ACYCLIC); |
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if ((mask&PARAMETER) != 0) flags.add(Flag.PARAMETER); |
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if ((mask&VARARGS) != 0) flags.add(Flag.VARARGS); |
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return flags; |
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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<<0; |
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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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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$n reference. This flag is currently set only for anonymous |
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* classes in superclass constructor calls and only for pre 1.4 targets. |
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* todo: use this flag for optimizing away this$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 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 methods (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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/** Modifier masks. |
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*/ |
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public static final int |
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AccessFlags = PUBLIC | PROTECTED | PRIVATE, |
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LocalClassFlags = FINAL | ABSTRACT | STRICTFP | ENUM | SYNTHETIC, |
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MemberClassFlags = LocalClassFlags | INTERFACE | AccessFlags, |
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ClassFlags = LocalClassFlags | INTERFACE | PUBLIC | ANNOTATION, |
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InterfaceVarFlags = FINAL | STATIC | PUBLIC, |
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VarFlags = AccessFlags | FINAL | STATIC | |
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VOLATILE | TRANSIENT | ENUM, |
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ConstructorFlags = AccessFlags, |
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InterfaceMethodFlags = ABSTRACT | PUBLIC, |
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MethodFlags = AccessFlags | ABSTRACT | STATIC | NATIVE | |
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SYNCHRONIZED | FINAL | STRICTFP; |
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public static final long |
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ExtendedStandardFlags = (long)StandardFlags | DEFAULT, |
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InterfaceDefaultMethodMask = ABSTRACT | PUBLIC | STRICTFP | SYNCHRONIZED | DEFAULT, |
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LocalVarFlags = FINAL | PARAMETER; |
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public static Set<Modifier> asModifierSet(long flags) { |
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Set<Modifier> modifiers = modifierSets.get(flags); |
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if (modifiers == null) { |
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modifiers = java.util.EnumSet.noneOf(Modifier.class); |
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if (0 != (flags & PUBLIC)) modifiers.add(Modifier.PUBLIC); |
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if (0 != (flags & PROTECTED)) modifiers.add(Modifier.PROTECTED); |
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if (0 != (flags & PRIVATE)) modifiers.add(Modifier.PRIVATE); |
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if (0 != (flags & ABSTRACT)) modifiers.add(Modifier.ABSTRACT); |
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if (0 != (flags & STATIC)) modifiers.add(Modifier.STATIC); |
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if (0 != (flags & FINAL)) modifiers.add(Modifier.FINAL); |
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if (0 != (flags & TRANSIENT)) modifiers.add(Modifier.TRANSIENT); |
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if (0 != (flags & VOLATILE)) modifiers.add(Modifier.VOLATILE); |
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if (0 != (flags & SYNCHRONIZED)) |
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modifiers.add(Modifier.SYNCHRONIZED); |
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if (0 != (flags & NATIVE)) modifiers.add(Modifier.NATIVE); |
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if (0 != (flags & STRICTFP)) modifiers.add(Modifier.STRICTFP); |
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modifiers = Collections.unmodifiableSet(modifiers); |
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modifierSets.put(flags, modifiers); |
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} |
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return modifiers; |
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} |
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// Cache of modifier sets. |
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private static final Map<Long, Set<Modifier>> modifierSets = |
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new java.util.concurrent.ConcurrentHashMap<Long, Set<Modifier>>(64); |
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||
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public static boolean isStatic(Symbol symbol) { |
|
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return (symbol.flags() & STATIC) != 0; |
|
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} |
|
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||
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public static boolean isEnum(Symbol symbol) { |
|
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return (symbol.flags() & ENUM) != 0; |
|
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} |
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||
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public static boolean isConstant(Symbol.VarSymbol symbol) { |
|
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return symbol.getConstValue() != null; |
|
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} |
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public enum Flag { |
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|
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PUBLIC("public"), |
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PRIVATE("private"), |
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PROTECTED("protected"), |
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STATIC("static"), |
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FINAL("final"), |
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SYNCHRONIZED("synchronized"), |
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VOLATILE("volatile"), |
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TRANSIENT("transient"), |
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NATIVE("native"), |
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INTERFACE("interface"), |
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ABSTRACT("abstract"), |
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DEFAULT("default"), |
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STRICTFP("strictfp"), |
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BRIDGE("bridge"), |
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SYNTHETIC("synthetic"), |
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DEPRECATED("deprecated"), |
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HASINIT("hasinit"), |
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ENUM("enum"), |
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IPROXY("iproxy"), |
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NOOUTERTHIS("noouterthis"), |
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EXISTS("exists"), |
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COMPOUND("compound"), |
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CLASS_SEEN("class_seen"), |
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SOURCE_SEEN("source_seen"), |
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LOCKED("locked"), |
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UNATTRIBUTED("unattributed"), |
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ANONCONSTR("anonconstr"), |
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ACYCLIC("acyclic"), |
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PARAMETER("parameter"), |
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VARARGS("varargs"), |
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PACKAGE("package"); |
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private final String name; |
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|
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Flag(String name) { |
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this.name = name; |
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} |
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|
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public String toString() { |
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return name; |
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} |
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} |
10 | 369 |
} |