Wed, 17 Oct 2012 16:43:26 +0100
7192245: Add parser support for default methods
Summary: Add support for 'default' keyword in modifier position
Reviewed-by: jjg
1 /*
2 * Copyright (c) 1999, 2012, 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 /** 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 {
44 private Flags() {} // uninstantiable
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 }
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&IPROXY) != 0) flags.add(Flag.IPROXY);
78 if ((mask&NOOUTERTHIS) != 0) flags.add(Flag.NOOUTERTHIS);
79 if ((mask&EXISTS) != 0) flags.add(Flag.EXISTS);
80 if ((mask&COMPOUND) != 0) flags.add(Flag.COMPOUND);
81 if ((mask&CLASS_SEEN) != 0) flags.add(Flag.CLASS_SEEN);
82 if ((mask&SOURCE_SEEN) != 0) flags.add(Flag.SOURCE_SEEN);
83 if ((mask&LOCKED) != 0) flags.add(Flag.LOCKED);
84 if ((mask&UNATTRIBUTED) != 0) flags.add(Flag.UNATTRIBUTED);
85 if ((mask&ANONCONSTR) != 0) flags.add(Flag.ANONCONSTR);
86 if ((mask&ACYCLIC) != 0) flags.add(Flag.ACYCLIC);
87 if ((mask&PARAMETER) != 0) flags.add(Flag.PARAMETER);
88 if ((mask&VARARGS) != 0) flags.add(Flag.VARARGS);
89 return flags;
90 }
92 /* Standard Java flags.
93 */
94 public static final int PUBLIC = 1<<0;
95 public static final int PRIVATE = 1<<1;
96 public static final int PROTECTED = 1<<2;
97 public static final int STATIC = 1<<3;
98 public static final int FINAL = 1<<4;
99 public static final int SYNCHRONIZED = 1<<5;
100 public static final int VOLATILE = 1<<6;
101 public static final int TRANSIENT = 1<<7;
102 public static final int NATIVE = 1<<8;
103 public static final int INTERFACE = 1<<9;
104 public static final int ABSTRACT = 1<<10;
105 public static final int STRICTFP = 1<<11;
107 /* Flag that marks a symbol synthetic, added in classfile v49.0. */
108 public static final int SYNTHETIC = 1<<12;
110 /** Flag that marks attribute interfaces, added in classfile v49.0. */
111 public static final int ANNOTATION = 1<<13;
113 /** An enumeration type or an enumeration constant, added in
114 * classfile v49.0. */
115 public static final int ENUM = 1<<14;
117 public static final int StandardFlags = 0x0fff;
118 public static final int ModifierFlags = StandardFlags & ~INTERFACE;
120 // Because the following access flags are overloaded with other
121 // bit positions, we translate them when reading and writing class
122 // files into unique bits positions: ACC_SYNTHETIC <-> SYNTHETIC,
123 // for example.
124 public static final int ACC_SUPER = 0x0020;
125 public static final int ACC_BRIDGE = 0x0040;
126 public static final int ACC_VARARGS = 0x0080;
128 /*****************************************
129 * Internal compiler flags (no bits in the lower 16).
130 *****************************************/
132 /** Flag is set if symbol is deprecated.
133 */
134 public static final int DEPRECATED = 1<<17;
136 /** Flag is set for a variable symbol if the variable's definition
137 * has an initializer part.
138 */
139 public static final int HASINIT = 1<<18;
141 /** Flag is set for compiler-generated anonymous method symbols
142 * that `own' an initializer block.
143 */
144 public static final int BLOCK = 1<<20;
146 /** Flag is set for compiler-generated abstract methods that implement
147 * an interface method (Miranda methods).
148 */
149 public static final int IPROXY = 1<<21;
151 /** Flag is set for nested classes that do not access instance members
152 * or `this' of an outer class and therefore don't need to be passed
153 * a this$n reference. This flag is currently set only for anonymous
154 * classes in superclass constructor calls and only for pre 1.4 targets.
155 * todo: use this flag for optimizing away this$n parameters in
156 * other cases.
157 */
158 public static final int NOOUTERTHIS = 1<<22;
160 /** Flag is set for package symbols if a package has a member or
161 * directory and therefore exists.
162 */
163 public static final int EXISTS = 1<<23;
165 /** Flag is set for compiler-generated compound classes
166 * representing multiple variable bounds
167 */
168 public static final int COMPOUND = 1<<24;
170 /** Flag is set for class symbols if a class file was found for this class.
171 */
172 public static final int CLASS_SEEN = 1<<25;
174 /** Flag is set for class symbols if a source file was found for this
175 * class.
176 */
177 public static final int SOURCE_SEEN = 1<<26;
179 /* State flags (are reset during compilation).
180 */
182 /** Flag for class symbols is set and later re-set as a lock in
183 * Enter to detect cycles in the superclass/superinterface
184 * relations. Similarly for constructor call cycle detection in
185 * Attr.
186 */
187 public static final int LOCKED = 1<<27;
189 /** Flag for class symbols is set and later re-set to indicate that a class
190 * has been entered but has not yet been attributed.
191 */
192 public static final int UNATTRIBUTED = 1<<28;
194 /** Flag for synthesized default constructors of anonymous classes.
195 */
196 public static final int ANONCONSTR = 1<<29;
198 /** Flag for class symbols to indicate it has been checked and found
199 * acyclic.
200 */
201 public static final int ACYCLIC = 1<<30;
203 /** Flag that marks bridge methods.
204 */
205 public static final long BRIDGE = 1L<<31;
207 /** Flag that marks formal parameters.
208 */
209 public static final long PARAMETER = 1L<<33;
211 /** Flag that marks varargs methods.
212 */
213 public static final long VARARGS = 1L<<34;
215 /** Flag for annotation type symbols to indicate it has been
216 * checked and found acyclic.
217 */
218 public static final long ACYCLIC_ANN = 1L<<35;
220 /** Flag that marks a generated default constructor.
221 */
222 public static final long GENERATEDCONSTR = 1L<<36;
224 /** Flag that marks a hypothetical method that need not really be
225 * generated in the binary, but is present in the symbol table to
226 * simplify checking for erasure clashes - also used for 292 poly sig methods.
227 */
228 public static final long HYPOTHETICAL = 1L<<37;
230 /**
231 * Flag that marks an internal proprietary class.
232 */
233 public static final long PROPRIETARY = 1L<<38;
235 /**
236 * Flag that marks a a multi-catch parameter
237 */
238 public static final long UNION = 1L<<39;
240 /**
241 * Flag that marks a special kind of bridge methods (the ones that
242 * come from restricted supertype bounds)
243 */
244 public static final long OVERRIDE_BRIDGE = 1L<<40;
246 /**
247 * Flag that marks an 'effectively final' local variable
248 */
249 public static final long EFFECTIVELY_FINAL = 1L<<41;
251 /**
252 * Flag that marks non-override equivalent methods with the same signature
253 */
254 public static final long CLASH = 1L<<42;
256 /**
257 * Flag that marks either a default method or an interface containing default methods
258 */
259 public static final long DEFAULT = 1L<<43;
261 /** Modifier masks.
262 */
263 public static final int
264 AccessFlags = PUBLIC | PROTECTED | PRIVATE,
265 LocalClassFlags = FINAL | ABSTRACT | STRICTFP | ENUM | SYNTHETIC,
266 MemberClassFlags = LocalClassFlags | INTERFACE | AccessFlags,
267 ClassFlags = LocalClassFlags | INTERFACE | PUBLIC | ANNOTATION,
268 InterfaceVarFlags = FINAL | STATIC | PUBLIC,
269 VarFlags = AccessFlags | FINAL | STATIC |
270 VOLATILE | TRANSIENT | ENUM,
271 ConstructorFlags = AccessFlags,
272 InterfaceMethodFlags = ABSTRACT | PUBLIC,
273 MethodFlags = AccessFlags | ABSTRACT | STATIC | NATIVE |
274 SYNCHRONIZED | FINAL | STRICTFP;
275 public static final long
276 ExtendedStandardFlags = (long)StandardFlags | DEFAULT,
277 InterfaceDefaultMethodMask = ABSTRACT | PUBLIC | STRICTFP | SYNCHRONIZED | DEFAULT,
278 LocalVarFlags = FINAL | PARAMETER;
281 public static Set<Modifier> asModifierSet(long flags) {
282 Set<Modifier> modifiers = modifierSets.get(flags);
283 if (modifiers == null) {
284 modifiers = java.util.EnumSet.noneOf(Modifier.class);
285 if (0 != (flags & PUBLIC)) modifiers.add(Modifier.PUBLIC);
286 if (0 != (flags & PROTECTED)) modifiers.add(Modifier.PROTECTED);
287 if (0 != (flags & PRIVATE)) modifiers.add(Modifier.PRIVATE);
288 if (0 != (flags & ABSTRACT)) modifiers.add(Modifier.ABSTRACT);
289 if (0 != (flags & STATIC)) modifiers.add(Modifier.STATIC);
290 if (0 != (flags & FINAL)) modifiers.add(Modifier.FINAL);
291 if (0 != (flags & TRANSIENT)) modifiers.add(Modifier.TRANSIENT);
292 if (0 != (flags & VOLATILE)) modifiers.add(Modifier.VOLATILE);
293 if (0 != (flags & SYNCHRONIZED))
294 modifiers.add(Modifier.SYNCHRONIZED);
295 if (0 != (flags & NATIVE)) modifiers.add(Modifier.NATIVE);
296 if (0 != (flags & STRICTFP)) modifiers.add(Modifier.STRICTFP);
297 modifiers = Collections.unmodifiableSet(modifiers);
298 modifierSets.put(flags, modifiers);
299 }
300 return modifiers;
301 }
303 // Cache of modifier sets.
304 private static Map<Long, Set<Modifier>> modifierSets =
305 new java.util.concurrent.ConcurrentHashMap<Long, Set<Modifier>>(64);
307 public static boolean isStatic(Symbol symbol) {
308 return (symbol.flags() & STATIC) != 0;
309 }
311 public static boolean isEnum(Symbol symbol) {
312 return (symbol.flags() & ENUM) != 0;
313 }
315 public static boolean isConstant(Symbol.VarSymbol symbol) {
316 return symbol.getConstValue() != null;
317 }
319 public enum Flag {
321 PUBLIC("public"),
322 PRIVATE("private"),
323 PROTECTED("protected"),
324 STATIC("static"),
325 FINAL("final"),
326 SYNCHRONIZED("synchronized"),
327 VOLATILE("volatile"),
328 TRANSIENT("transient"),
329 NATIVE("native"),
330 INTERFACE("interface"),
331 ABSTRACT("abstract"),
332 DEFAULT("default"),
333 STRICTFP("strictfp"),
334 BRIDGE("bridge"),
335 SYNTHETIC("synthetic"),
336 DEPRECATED("deprecated"),
337 HASINIT("hasinit"),
338 ENUM("enum"),
339 IPROXY("iproxy"),
340 NOOUTERTHIS("noouterthis"),
341 EXISTS("exists"),
342 COMPOUND("compound"),
343 CLASS_SEEN("class_seen"),
344 SOURCE_SEEN("source_seen"),
345 LOCKED("locked"),
346 UNATTRIBUTED("unattributed"),
347 ANONCONSTR("anonconstr"),
348 ACYCLIC("acyclic"),
349 PARAMETER("parameter"),
350 VARARGS("varargs"),
351 PACKAGE("package");
353 String name;
355 Flag(String name) {
356 this.name = name;
357 }
359 public String toString() {
360 return name;
361 }
362 }
363 }