Mon, 01 Feb 2010 17:05:35 -0800
6919986: [308] change size of type_index (of CLASS_EXTENDS and THROWS) from byte to short
Reviewed-by: darcy, jjg
Contributed-by: mali@csail.mit.edu, mernst@cs.washington.edu
1 /*
2 * Copyright 1999-2008 Sun Microsystems, Inc. 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. Sun designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
22 * CA 95054 USA or visit www.sun.com if you need additional information or
23 * have any questions.
24 */
26 package com.sun.tools.javac.code;
28 import java.util.EnumSet;
29 import java.util.Collections;
30 import java.util.Map;
31 import java.util.Set;
32 import javax.lang.model.element.Modifier;
34 /** Access flags and other modifiers for Java classes and members.
35 *
36 * <p><b>This is NOT part of any API supported by Sun Microsystems. If
37 * you write code that depends on this, you do so at your own risk.
38 * This code and its internal interfaces are subject to change or
39 * deletion without notice.</b>
40 */
41 public class Flags {
43 private Flags() {} // uninstantiable
45 public static String toString(long flags) {
46 StringBuffer buf = new StringBuffer();
47 String sep = "";
48 for (Flag s : asFlagSet(flags)) {
49 buf.append(sep);
50 buf.append(s);
51 sep = " ";
52 }
53 return buf.toString();
54 }
56 public static EnumSet<Flag> asFlagSet(long mask) {
57 EnumSet<Flag> flags = EnumSet.noneOf(Flag.class);
58 if ((mask&PUBLIC) != 0) flags.add(Flag.PUBLIC);
59 if ((mask&PRIVATE) != 0) flags.add(Flag.PRIVATE);
60 if ((mask&PROTECTED) != 0) flags.add(Flag.PROTECTED);
61 if ((mask&STATIC) != 0) flags.add(Flag.STATIC);
62 if ((mask&FINAL) != 0) flags.add(Flag.FINAL);
63 if ((mask&SYNCHRONIZED) != 0) flags.add(Flag.SYNCHRONIZED);
64 if ((mask&VOLATILE) != 0) flags.add(Flag.VOLATILE);
65 if ((mask&TRANSIENT) != 0) flags.add(Flag.TRANSIENT);
66 if ((mask&NATIVE) != 0) flags.add(Flag.NATIVE);
67 if ((mask&INTERFACE) != 0) flags.add(Flag.INTERFACE);
68 if ((mask&ABSTRACT) != 0) flags.add(Flag.ABSTRACT);
69 if ((mask&STRICTFP) != 0) flags.add(Flag.STRICTFP);
70 if ((mask&BRIDGE) != 0) flags.add(Flag.BRIDGE);
71 if ((mask&SYNTHETIC) != 0) flags.add(Flag.SYNTHETIC);
72 if ((mask&DEPRECATED) != 0) flags.add(Flag.DEPRECATED);
73 if ((mask&HASINIT) != 0) flags.add(Flag.HASINIT);
74 if ((mask&ENUM) != 0) flags.add(Flag.ENUM);
75 if ((mask&IPROXY) != 0) flags.add(Flag.IPROXY);
76 if ((mask&NOOUTERTHIS) != 0) flags.add(Flag.NOOUTERTHIS);
77 if ((mask&EXISTS) != 0) flags.add(Flag.EXISTS);
78 if ((mask&COMPOUND) != 0) flags.add(Flag.COMPOUND);
79 if ((mask&CLASS_SEEN) != 0) flags.add(Flag.CLASS_SEEN);
80 if ((mask&SOURCE_SEEN) != 0) flags.add(Flag.SOURCE_SEEN);
81 if ((mask&LOCKED) != 0) flags.add(Flag.LOCKED);
82 if ((mask&UNATTRIBUTED) != 0) flags.add(Flag.UNATTRIBUTED);
83 if ((mask&ANONCONSTR) != 0) flags.add(Flag.ANONCONSTR);
84 if ((mask&ACYCLIC) != 0) flags.add(Flag.ACYCLIC);
85 if ((mask&PARAMETER) != 0) flags.add(Flag.PARAMETER);
86 if ((mask&VARARGS) != 0) flags.add(Flag.VARARGS);
87 return flags;
88 }
90 /* Standard Java flags.
91 */
92 public static final int PUBLIC = 1<<0;
93 public static final int PRIVATE = 1<<1;
94 public static final int PROTECTED = 1<<2;
95 public static final int STATIC = 1<<3;
96 public static final int FINAL = 1<<4;
97 public static final int SYNCHRONIZED = 1<<5;
98 public static final int VOLATILE = 1<<6;
99 public static final int TRANSIENT = 1<<7;
100 public static final int NATIVE = 1<<8;
101 public static final int INTERFACE = 1<<9;
102 public static final int ABSTRACT = 1<<10;
103 public static final int STRICTFP = 1<<11;
105 /* Flag that marks a symbol synthetic, added in classfile v49.0. */
106 public static final int SYNTHETIC = 1<<12;
108 /** Flag that marks attribute interfaces, added in classfile v49.0. */
109 public static final int ANNOTATION = 1<<13;
111 /** An enumeration type or an enumeration constant, added in
112 * classfile v49.0. */
113 public static final int ENUM = 1<<14;
115 public static final int StandardFlags = 0x0fff;
116 public static final int ModifierFlags = StandardFlags & ~INTERFACE;
118 // Because the following access flags are overloaded with other
119 // bit positions, we translate them when reading and writing class
120 // files into unique bits positions: ACC_SYNTHETIC <-> SYNTHETIC,
121 // for example.
122 public static final int ACC_SUPER = 0x0020;
123 public static final int ACC_BRIDGE = 0x0040;
124 public static final int ACC_VARARGS = 0x0080;
126 /*****************************************
127 * Internal compiler flags (no bits in the lower 16).
128 *****************************************/
130 /** Flag is set if symbol is deprecated.
131 */
132 public static final int DEPRECATED = 1<<17;
134 /** Flag is set for a variable symbol if the variable's definition
135 * has an initializer part.
136 */
137 public static final int HASINIT = 1<<18;
139 /** Flag is set for compiler-generated anonymous method symbols
140 * that `own' an initializer block.
141 */
142 public static final int BLOCK = 1<<20;
144 /** Flag is set for compiler-generated abstract methods that implement
145 * an interface method (Miranda methods).
146 */
147 public static final int IPROXY = 1<<21;
149 /** Flag is set for nested classes that do not access instance members
150 * or `this' of an outer class and therefore don't need to be passed
151 * a this$n reference. This flag is currently set only for anonymous
152 * classes in superclass constructor calls and only for pre 1.4 targets.
153 * todo: use this flag for optimizing away this$n parameters in
154 * other cases.
155 */
156 public static final int NOOUTERTHIS = 1<<22;
158 /** Flag is set for package symbols if a package has a member or
159 * directory and therefore exists.
160 */
161 public static final int EXISTS = 1<<23;
163 /** Flag is set for compiler-generated compound classes
164 * representing multiple variable bounds
165 */
166 public static final int COMPOUND = 1<<24;
168 /** Flag is set for class symbols if a class file was found for this class.
169 */
170 public static final int CLASS_SEEN = 1<<25;
172 /** Flag is set for class symbols if a source file was found for this
173 * class.
174 */
175 public static final int SOURCE_SEEN = 1<<26;
177 /* State flags (are reset during compilation).
178 */
180 /** Flag for class symbols is set and later re-set as a lock in
181 * Enter to detect cycles in the superclass/superinterface
182 * relations. Similarly for constructor call cycle detection in
183 * Attr.
184 */
185 public static final int LOCKED = 1<<27;
187 /** Flag for class symbols is set and later re-set to indicate that a class
188 * has been entered but has not yet been attributed.
189 */
190 public static final int UNATTRIBUTED = 1<<28;
192 /** Flag for synthesized default constructors of anonymous classes.
193 */
194 public static final int ANONCONSTR = 1<<29;
196 /** Flag for class symbols to indicate it has been checked and found
197 * acyclic.
198 */
199 public static final int ACYCLIC = 1<<30;
201 /** Flag that marks bridge methods.
202 */
203 public static final long BRIDGE = 1L<<31;
205 /** Flag that marks formal parameters.
206 */
207 public static final long PARAMETER = 1L<<33;
209 /** Flag that marks varargs methods.
210 */
211 public static final long VARARGS = 1L<<34;
213 /** Flag for annotation type symbols to indicate it has been
214 * checked and found acyclic.
215 */
216 public static final long ACYCLIC_ANN = 1L<<35;
218 /** Flag that marks a generated default constructor.
219 */
220 public static final long GENERATEDCONSTR = 1L<<36;
222 /** Flag that marks a hypothetical method that need not really be
223 * generated in the binary, but is present in the symbol table to
224 * simplify checking for erasure clashes.
225 */
226 public static final long HYPOTHETICAL = 1L<<37;
228 /**
229 * Flag that marks a Sun proprietary class.
230 */
231 public static final long PROPRIETARY = 1L<<38;
233 /** Modifier masks.
234 */
235 public static final int
236 AccessFlags = PUBLIC | PROTECTED | PRIVATE,
237 LocalClassFlags = FINAL | ABSTRACT | STRICTFP | ENUM | SYNTHETIC,
238 MemberClassFlags = LocalClassFlags | INTERFACE | AccessFlags,
239 ClassFlags = LocalClassFlags | INTERFACE | PUBLIC | ANNOTATION,
240 InterfaceVarFlags = FINAL | STATIC | PUBLIC,
241 VarFlags = AccessFlags | FINAL | STATIC |
242 VOLATILE | TRANSIENT | ENUM,
243 ConstructorFlags = AccessFlags,
244 InterfaceMethodFlags = ABSTRACT | PUBLIC,
245 MethodFlags = AccessFlags | ABSTRACT | STATIC | NATIVE |
246 SYNCHRONIZED | FINAL | STRICTFP;
247 public static final long
248 LocalVarFlags = FINAL | PARAMETER;
250 public static Set<Modifier> asModifierSet(long flags) {
251 Set<Modifier> modifiers = modifierSets.get(flags);
252 if (modifiers == null) {
253 modifiers = java.util.EnumSet.noneOf(Modifier.class);
254 if (0 != (flags & PUBLIC)) modifiers.add(Modifier.PUBLIC);
255 if (0 != (flags & PROTECTED)) modifiers.add(Modifier.PROTECTED);
256 if (0 != (flags & PRIVATE)) modifiers.add(Modifier.PRIVATE);
257 if (0 != (flags & ABSTRACT)) modifiers.add(Modifier.ABSTRACT);
258 if (0 != (flags & STATIC)) modifiers.add(Modifier.STATIC);
259 if (0 != (flags & FINAL)) modifiers.add(Modifier.FINAL);
260 if (0 != (flags & TRANSIENT)) modifiers.add(Modifier.TRANSIENT);
261 if (0 != (flags & VOLATILE)) modifiers.add(Modifier.VOLATILE);
262 if (0 != (flags & SYNCHRONIZED))
263 modifiers.add(Modifier.SYNCHRONIZED);
264 if (0 != (flags & NATIVE)) modifiers.add(Modifier.NATIVE);
265 if (0 != (flags & STRICTFP)) modifiers.add(Modifier.STRICTFP);
266 modifiers = Collections.unmodifiableSet(modifiers);
267 modifierSets.put(flags, modifiers);
268 }
269 return modifiers;
270 }
272 // Cache of modifier sets.
273 private static Map<Long, Set<Modifier>> modifierSets =
274 new java.util.concurrent.ConcurrentHashMap<Long, Set<Modifier>>(64);
276 public static boolean isStatic(Symbol symbol) {
277 return (symbol.flags() & STATIC) != 0;
278 }
280 public static boolean isEnum(Symbol symbol) {
281 return (symbol.flags() & ENUM) != 0;
282 }
284 public static boolean isConstant(Symbol.VarSymbol symbol) {
285 return symbol.getConstValue() != null;
286 }
288 public enum Flag {
290 PUBLIC("public"),
291 PRIVATE("private"),
292 PROTECTED("protected"),
293 STATIC("static"),
294 FINAL("final"),
295 SYNCHRONIZED("synchronized"),
296 VOLATILE("volatile"),
297 TRANSIENT("transient"),
298 NATIVE("native"),
299 INTERFACE("interface"),
300 ABSTRACT("abstract"),
301 STRICTFP("strictfp"),
302 BRIDGE("bridge"),
303 SYNTHETIC("synthetic"),
304 DEPRECATED("deprecated"),
305 HASINIT("hasinit"),
306 ENUM("enum"),
307 IPROXY("iproxy"),
308 NOOUTERTHIS("noouterthis"),
309 EXISTS("exists"),
310 COMPOUND("compound"),
311 CLASS_SEEN("class_seen"),
312 SOURCE_SEEN("source_seen"),
313 LOCKED("locked"),
314 UNATTRIBUTED("unattributed"),
315 ANONCONSTR("anonconstr"),
316 ACYCLIC("acyclic"),
317 PARAMETER("parameter"),
318 VARARGS("varargs"),
319 PACKAGE("package");
321 String name;
323 Flag(String name) {
324 this.name = name;
325 }
327 public String toString() {
328 return name;
329 }
330 }
331 }