Sat, 01 May 2010 15:05:39 -0700
6939134: JSR 292 adjustments to method handle invocation
Summary: split MethodHandle.invoke into invokeExact and invokeGeneric
Reviewed-by: twisti
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 /**
234 * Flag that marks a signature-polymorphic invoke method.
235 * (These occur inside java.dyn.MethodHandle.)
236 */
237 public static final long POLYMORPHIC_SIGNATURE = 1L<<39;
239 /** Modifier masks.
240 */
241 public static final int
242 AccessFlags = PUBLIC | PROTECTED | PRIVATE,
243 LocalClassFlags = FINAL | ABSTRACT | STRICTFP | ENUM | SYNTHETIC,
244 MemberClassFlags = LocalClassFlags | INTERFACE | AccessFlags,
245 ClassFlags = LocalClassFlags | INTERFACE | PUBLIC | ANNOTATION,
246 InterfaceVarFlags = FINAL | STATIC | PUBLIC,
247 VarFlags = AccessFlags | FINAL | STATIC |
248 VOLATILE | TRANSIENT | ENUM,
249 ConstructorFlags = AccessFlags,
250 InterfaceMethodFlags = ABSTRACT | PUBLIC,
251 MethodFlags = AccessFlags | ABSTRACT | STATIC | NATIVE |
252 SYNCHRONIZED | FINAL | STRICTFP;
253 public static final long
254 LocalVarFlags = FINAL | PARAMETER;
256 public static Set<Modifier> asModifierSet(long flags) {
257 Set<Modifier> modifiers = modifierSets.get(flags);
258 if (modifiers == null) {
259 modifiers = java.util.EnumSet.noneOf(Modifier.class);
260 if (0 != (flags & PUBLIC)) modifiers.add(Modifier.PUBLIC);
261 if (0 != (flags & PROTECTED)) modifiers.add(Modifier.PROTECTED);
262 if (0 != (flags & PRIVATE)) modifiers.add(Modifier.PRIVATE);
263 if (0 != (flags & ABSTRACT)) modifiers.add(Modifier.ABSTRACT);
264 if (0 != (flags & STATIC)) modifiers.add(Modifier.STATIC);
265 if (0 != (flags & FINAL)) modifiers.add(Modifier.FINAL);
266 if (0 != (flags & TRANSIENT)) modifiers.add(Modifier.TRANSIENT);
267 if (0 != (flags & VOLATILE)) modifiers.add(Modifier.VOLATILE);
268 if (0 != (flags & SYNCHRONIZED))
269 modifiers.add(Modifier.SYNCHRONIZED);
270 if (0 != (flags & NATIVE)) modifiers.add(Modifier.NATIVE);
271 if (0 != (flags & STRICTFP)) modifiers.add(Modifier.STRICTFP);
272 modifiers = Collections.unmodifiableSet(modifiers);
273 modifierSets.put(flags, modifiers);
274 }
275 return modifiers;
276 }
278 // Cache of modifier sets.
279 private static Map<Long, Set<Modifier>> modifierSets =
280 new java.util.concurrent.ConcurrentHashMap<Long, Set<Modifier>>(64);
282 public static boolean isStatic(Symbol symbol) {
283 return (symbol.flags() & STATIC) != 0;
284 }
286 public static boolean isEnum(Symbol symbol) {
287 return (symbol.flags() & ENUM) != 0;
288 }
290 public static boolean isConstant(Symbol.VarSymbol symbol) {
291 return symbol.getConstValue() != null;
292 }
294 public enum Flag {
296 PUBLIC("public"),
297 PRIVATE("private"),
298 PROTECTED("protected"),
299 STATIC("static"),
300 FINAL("final"),
301 SYNCHRONIZED("synchronized"),
302 VOLATILE("volatile"),
303 TRANSIENT("transient"),
304 NATIVE("native"),
305 INTERFACE("interface"),
306 ABSTRACT("abstract"),
307 STRICTFP("strictfp"),
308 BRIDGE("bridge"),
309 SYNTHETIC("synthetic"),
310 DEPRECATED("deprecated"),
311 HASINIT("hasinit"),
312 ENUM("enum"),
313 IPROXY("iproxy"),
314 NOOUTERTHIS("noouterthis"),
315 EXISTS("exists"),
316 COMPOUND("compound"),
317 CLASS_SEEN("class_seen"),
318 SOURCE_SEEN("source_seen"),
319 LOCKED("locked"),
320 UNATTRIBUTED("unattributed"),
321 ANONCONSTR("anonconstr"),
322 ACYCLIC("acyclic"),
323 PARAMETER("parameter"),
324 VARARGS("varargs"),
325 PACKAGE("package");
327 String name;
329 Flag(String name) {
330 this.name = name;
331 }
333 public String toString() {
334 return name;
335 }
336 }
337 }