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 */
25
26 package com.sun.tools.javac.code;
27
28 import java.util.Collections;
29 import java.util.EnumSet;
30 import java.util.Map;
31 import java.util.Set;
32
33 import javax.lang.model.element.Modifier;
34
35 /** Access flags and other modifiers for Java classes and members.
36 *
37 * <p><b>This is NOT part of any supported API.
38 * If you write code that depends on this, you do so at your own risk.
39 * This code and its internal interfaces are subject to change or
40 * deletion without notice.</b>
41 */
42 public class Flags {
43
44 private Flags() {} // uninstantiable
45
46 public static String toString(long flags) {
47 StringBuilder buf = new StringBuilder();
48 String sep = "";
49 for (Flag s : asFlagSet(flags)) {
50 buf.append(sep);
51 buf.append(s);
52 sep = " ";
53 }
54 return buf.toString();
55 }
56
57 public static EnumSet<Flag> asFlagSet(long mask) {
58 EnumSet<Flag> flags = EnumSet.noneOf(Flag.class);
59 if ((mask&PUBLIC) != 0) flags.add(Flag.PUBLIC);
60 if ((mask&PRIVATE) != 0) flags.add(Flag.PRIVATE);
61 if ((mask&PROTECTED) != 0) flags.add(Flag.PROTECTED);
62 if ((mask&STATIC) != 0) flags.add(Flag.STATIC);
63 if ((mask&FINAL) != 0) flags.add(Flag.FINAL);
64 if ((mask&SYNCHRONIZED) != 0) flags.add(Flag.SYNCHRONIZED);
65 if ((mask&VOLATILE) != 0) flags.add(Flag.VOLATILE);
66 if ((mask&TRANSIENT) != 0) flags.add(Flag.TRANSIENT);
67 if ((mask&NATIVE) != 0) flags.add(Flag.NATIVE);
68 if ((mask&INTERFACE) != 0) flags.add(Flag.INTERFACE);
69 if ((mask&ABSTRACT) != 0) flags.add(Flag.ABSTRACT);
70 if ((mask&DEFAULT) != 0) flags.add(Flag.DEFAULT);
71 if ((mask&STRICTFP) != 0) flags.add(Flag.STRICTFP);
72 if ((mask&BRIDGE) != 0) flags.add(Flag.BRIDGE);
73 if ((mask&SYNTHETIC) != 0) flags.add(Flag.SYNTHETIC);
74 if ((mask&DEPRECATED) != 0) flags.add(Flag.DEPRECATED);
75 if ((mask&HASINIT) != 0) flags.add(Flag.HASINIT);
76 if ((mask&ENUM) != 0) flags.add(Flag.ENUM);
77 if ((mask&MANDATED) != 0) flags.add(Flag.MANDATED);
78 if ((mask&IPROXY) != 0) flags.add(Flag.IPROXY);
79 if ((mask&NOOUTERTHIS) != 0) flags.add(Flag.NOOUTERTHIS);
80 if ((mask&EXISTS) != 0) flags.add(Flag.EXISTS);
81 if ((mask&COMPOUND) != 0) flags.add(Flag.COMPOUND);
82 if ((mask&CLASS_SEEN) != 0) flags.add(Flag.CLASS_SEEN);
83 if ((mask&SOURCE_SEEN) != 0) flags.add(Flag.SOURCE_SEEN);
84 if ((mask&LOCKED) != 0) flags.add(Flag.LOCKED);
85 if ((mask&UNATTRIBUTED) != 0) flags.add(Flag.UNATTRIBUTED);
86 if ((mask&ANONCONSTR) != 0) flags.add(Flag.ANONCONSTR);
87 if ((mask&ACYCLIC) != 0) flags.add(Flag.ACYCLIC);
88 if ((mask&PARAMETER) != 0) flags.add(Flag.PARAMETER);
89 if ((mask&VARARGS) != 0) flags.add(Flag.VARARGS);
90 return flags;
91 }
92
93 /* Standard Java flags.
94 */
95 public static final int PUBLIC = 1<<0;
96 public static final int PRIVATE = 1<<1;
97 public static final int PROTECTED = 1<<2;
98 public static final int STATIC = 1<<3;
99 public static final int FINAL = 1<<4;
100 public static final int SYNCHRONIZED = 1<<5;
101 public static final int VOLATILE = 1<<6;
102 public static final int TRANSIENT = 1<<7;
103 public static final int NATIVE = 1<<8;
104 public static final int INTERFACE = 1<<9;
105 public static final int ABSTRACT = 1<<10;
106 public static final int STRICTFP = 1<<11;
107
108 /* Flag that marks a symbol synthetic, added in classfile v49.0. */
109 public static final int SYNTHETIC = 1<<12;
110
111 /** Flag that marks attribute interfaces, added in classfile v49.0. */
112 public static final int ANNOTATION = 1<<13;
113
114 /** An enumeration type or an enumeration constant, added in
115 * classfile v49.0. */
116 public static final int ENUM = 1<<14;
117
118 /** Added in SE8, represents constructs implicitly declared in source. */
119 public static final int MANDATED = 1<<15;
120
121 public static final int StandardFlags = 0x0fff;
122 public static final int ModifierFlags = StandardFlags & ~INTERFACE;
123
124 // Because the following access flags are overloaded with other
125 // bit positions, we translate them when reading and writing class
126 // files into unique bits positions: ACC_SYNTHETIC <-> SYNTHETIC,
127 // for example.
128 public static final int ACC_SUPER = 0x0020;
129 public static final int ACC_BRIDGE = 0x0040;
130 public static final int ACC_VARARGS = 0x0080;
131
132 /*****************************************
133 * Internal compiler flags (no bits in the lower 16).
134 *****************************************/
135
136 /** Flag is set if symbol is deprecated.
137 */
138 public static final int DEPRECATED = 1<<17;
139
140 /** Flag is set for a variable symbol if the variable's definition
141 * has an initializer part.
142 */
143 public static final int HASINIT = 1<<18;
144
145 /** Flag is set for compiler-generated anonymous method symbols
146 * that `own' an initializer block.
147 */
148 public static final int BLOCK = 1<<20;
149
150 /** Flag is set for compiler-generated abstract methods that implement
151 * an interface method (Miranda methods).
152 */
153 public static final int IPROXY = 1<<21;
154
155 /** Flag is set for nested classes that do not access instance members
156 * or `this' of an outer class and therefore don't need to be passed
157 * a this$n reference. This flag is currently set only for anonymous
158 * classes in superclass constructor calls and only for pre 1.4 targets.
159 * todo: use this flag for optimizing away this$n parameters in
160 * other cases.
161 */
162 public static final int NOOUTERTHIS = 1<<22;
163
164 /** Flag is set for package symbols if a package has a member or
165 * directory and therefore exists.
166 */
167 public static final int EXISTS = 1<<23;
168
169 /** Flag is set for compiler-generated compound classes
170 * representing multiple variable bounds
171 */
172 public static final int COMPOUND = 1<<24;
173
174 /** Flag is set for class symbols if a class file was found for this class.
175 */
176 public static final int CLASS_SEEN = 1<<25;
177
178 /** Flag is set for class symbols if a source file was found for this
179 * class.
180 */
181 public static final int SOURCE_SEEN = 1<<26;
182
183 /* State flags (are reset during compilation).
184 */
185
186 /** Flag for class symbols is set and later re-set as a lock in
187 * Enter to detect cycles in the superclass/superinterface
188 * relations. Similarly for constructor call cycle detection in
189 * Attr.
190 */
191 public static final int LOCKED = 1<<27;
192
193 /** Flag for class symbols is set and later re-set to indicate that a class
194 * has been entered but has not yet been attributed.
195 */
196 public static final int UNATTRIBUTED = 1<<28;
197
198 /** Flag for synthesized default constructors of anonymous classes.
199 */
200 public static final int ANONCONSTR = 1<<29;
201
202 /** Flag for class symbols to indicate it has been checked and found
203 * acyclic.
204 */
205 public static final int ACYCLIC = 1<<30;
206
207 /** Flag that marks bridge methods.
208 */
209 public static final long BRIDGE = 1L<<31;
210
211 /** Flag that marks formal parameters.
212 */
213 public static final long PARAMETER = 1L<<33;
214
215 /** Flag that marks varargs methods.
216 */
217 public static final long VARARGS = 1L<<34;
218
219 /** Flag for annotation type symbols to indicate it has been
220 * checked and found acyclic.
221 */
222 public static final long ACYCLIC_ANN = 1L<<35;
223
224 /** Flag that marks a generated default constructor.
225 */
226 public static final long GENERATEDCONSTR = 1L<<36;
227
228 /** Flag that marks a hypothetical method that need not really be
229 * generated in the binary, but is present in the symbol table to
230 * simplify checking for erasure clashes - also used for 292 poly sig methods.
231 */
232 public static final long HYPOTHETICAL = 1L<<37;
233
234 /**
235 * Flag that marks an internal proprietary class.
236 */
237 public static final long PROPRIETARY = 1L<<38;
238
239 /**
240 * Flag that marks a multi-catch parameter.
241 */
242 public static final long UNION = 1L<<39;
243
244 /**
245 * Flag that marks a special kind of bridge method (the ones that
246 * come from restricted supertype bounds).
247 */
248 public static final long OVERRIDE_BRIDGE = 1L<<40;
249
250 /**
251 * Flag that marks an 'effectively final' local variable.
252 */
253 public static final long EFFECTIVELY_FINAL = 1L<<41;
254
255 /**
256 * Flag that marks non-override equivalent methods with the same signature.
257 */
258 public static final long CLASH = 1L<<42;
259
260 /**
261 * Flag that marks either a default method or an interface containing default methods
262 */
263 public static final long DEFAULT = 1L<<43;
264
265 /**
266 * Flag that marks class as auxiliary, ie a non-public class following
267 * the public class in a source file, that could block implicit compilation.
268 */
269 public static final long AUXILIARY = 1L<<44;
270
271 /** Modifier masks.
272 */
273 public static final int
274 AccessFlags = PUBLIC | PROTECTED | PRIVATE,
275 LocalClassFlags = FINAL | ABSTRACT | STRICTFP | ENUM | SYNTHETIC,
276 MemberClassFlags = LocalClassFlags | INTERFACE | AccessFlags,
277 ClassFlags = LocalClassFlags | INTERFACE | PUBLIC | ANNOTATION,
278 InterfaceVarFlags = FINAL | STATIC | PUBLIC,
279 VarFlags = AccessFlags | FINAL | STATIC |
280 VOLATILE | TRANSIENT | ENUM,
281 ConstructorFlags = AccessFlags,
282 InterfaceMethodFlags = ABSTRACT | PUBLIC,
283 MethodFlags = AccessFlags | ABSTRACT | STATIC | NATIVE |
284 SYNCHRONIZED | FINAL | STRICTFP;
285 public static final long
286 ExtendedStandardFlags = (long)StandardFlags | DEFAULT,
287 InterfaceMethodMask = ABSTRACT | STATIC | PUBLIC | STRICTFP | DEFAULT,
288 LocalVarFlags = FINAL | PARAMETER;
289
290
291 public static Set<Modifier> asModifierSet(long flags) {
292 Set<Modifier> modifiers = modifierSets.get(flags);
293 if (modifiers == null) {
294 modifiers = java.util.EnumSet.noneOf(Modifier.class);
295 if (0 != (flags & PUBLIC)) modifiers.add(Modifier.PUBLIC);
296 if (0 != (flags & PROTECTED)) modifiers.add(Modifier.PROTECTED);
297 if (0 != (flags & PRIVATE)) modifiers.add(Modifier.PRIVATE);
298 if (0 != (flags & ABSTRACT)) modifiers.add(Modifier.ABSTRACT);
299 if (0 != (flags & STATIC)) modifiers.add(Modifier.STATIC);
300 if (0 != (flags & FINAL)) modifiers.add(Modifier.FINAL);
301 if (0 != (flags & TRANSIENT)) modifiers.add(Modifier.TRANSIENT);
302 if (0 != (flags & VOLATILE)) modifiers.add(Modifier.VOLATILE);
303 if (0 != (flags & SYNCHRONIZED))
304 modifiers.add(Modifier.SYNCHRONIZED);
305 if (0 != (flags & NATIVE)) modifiers.add(Modifier.NATIVE);
306 if (0 != (flags & STRICTFP)) modifiers.add(Modifier.STRICTFP);
307 modifiers = Collections.unmodifiableSet(modifiers);
308 modifierSets.put(flags, modifiers);
309 }
310 return modifiers;
311 }
312
313 // Cache of modifier sets.
314 private static final Map<Long, Set<Modifier>> modifierSets =
315 new java.util.concurrent.ConcurrentHashMap<Long, Set<Modifier>>(64);
316
317 public static boolean isStatic(Symbol symbol) {
318 return (symbol.flags() & STATIC) != 0;
319 }
320
321 public static boolean isEnum(Symbol symbol) {
322 return (symbol.flags() & ENUM) != 0;
323 }
324
325 public static boolean isConstant(Symbol.VarSymbol symbol) {
326 return symbol.getConstValue() != null;
327 }
328
329 public enum Flag {
330
331 PUBLIC("public"),
332 PRIVATE("private"),
333 PROTECTED("protected"),
334 STATIC("static"),
335 FINAL("final"),
336 SYNCHRONIZED("synchronized"),
337 VOLATILE("volatile"),
338 TRANSIENT("transient"),
339 NATIVE("native"),
340 INTERFACE("interface"),
341 ABSTRACT("abstract"),
342 DEFAULT("default"),
343 STRICTFP("strictfp"),
344 BRIDGE("bridge"),
345 SYNTHETIC("synthetic"),
346 DEPRECATED("deprecated"),
347 HASINIT("hasinit"),
348 ENUM("enum"),
349 MANDATED("mandated"),
350 IPROXY("iproxy"),
351 NOOUTERTHIS("noouterthis"),
352 EXISTS("exists"),
353 COMPOUND("compound"),
354 CLASS_SEEN("class_seen"),
355 SOURCE_SEEN("source_seen"),
356 LOCKED("locked"),
357 UNATTRIBUTED("unattributed"),
358 ANONCONSTR("anonconstr"),
359 ACYCLIC("acyclic"),
360 PARAMETER("parameter"),
361 VARARGS("varargs"),
362 PACKAGE("package");
363
364 private final String name;
365
366 Flag(String name) {
367 this.name = name;
368 }
369
370 public String toString() {
371 return name;
372 }
373 }
374 }