Mon, 26 Mar 2012 15:28:49 +0100
7133185: Update 292 overload resolution logic to match JLS
Summary: Re-implement special overload resolution support for method handles according to the JLS SE 7 definition
Reviewed-by: jjg, dlsmith, jrose
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.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 supported API.
37 * If 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 StringBuilder buf = new StringBuilder();
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 - also used for 292 poly sig methods.
225 */
226 public static final long HYPOTHETICAL = 1L<<37;
228 /**
229 * Flag that marks an internal proprietary class.
230 */
231 public static final long PROPRIETARY = 1L<<38;
233 /**
234 * Flag that marks a a multi-catch parameter
235 */
236 public static final long UNION = 1L<<39;
238 /**
239 * Flag that marks a special kind of bridge methods (the ones that
240 * come from restricted supertype bounds)
241 */
242 public static final long OVERRIDE_BRIDGE = 1L<<40;
244 /**
245 * Flag that marks an 'effectively final' local variable
246 */
247 public static final long EFFECTIVELY_FINAL = 1L<<41;
249 /**
250 * Flag that marks non-override equivalent methods with the same signature
251 */
252 public static final long CLASH = 1L<<42;
254 /** Modifier masks.
255 */
256 public static final int
257 AccessFlags = PUBLIC | PROTECTED | PRIVATE,
258 LocalClassFlags = FINAL | ABSTRACT | STRICTFP | ENUM | SYNTHETIC,
259 MemberClassFlags = LocalClassFlags | INTERFACE | AccessFlags,
260 ClassFlags = LocalClassFlags | INTERFACE | PUBLIC | ANNOTATION,
261 InterfaceVarFlags = FINAL | STATIC | PUBLIC,
262 VarFlags = AccessFlags | FINAL | STATIC |
263 VOLATILE | TRANSIENT | ENUM,
264 ConstructorFlags = AccessFlags,
265 InterfaceMethodFlags = ABSTRACT | PUBLIC,
266 MethodFlags = AccessFlags | ABSTRACT | STATIC | NATIVE |
267 SYNCHRONIZED | FINAL | STRICTFP;
268 public static final long
269 LocalVarFlags = FINAL | PARAMETER;
271 public static Set<Modifier> asModifierSet(long flags) {
272 Set<Modifier> modifiers = modifierSets.get(flags);
273 if (modifiers == null) {
274 modifiers = java.util.EnumSet.noneOf(Modifier.class);
275 if (0 != (flags & PUBLIC)) modifiers.add(Modifier.PUBLIC);
276 if (0 != (flags & PROTECTED)) modifiers.add(Modifier.PROTECTED);
277 if (0 != (flags & PRIVATE)) modifiers.add(Modifier.PRIVATE);
278 if (0 != (flags & ABSTRACT)) modifiers.add(Modifier.ABSTRACT);
279 if (0 != (flags & STATIC)) modifiers.add(Modifier.STATIC);
280 if (0 != (flags & FINAL)) modifiers.add(Modifier.FINAL);
281 if (0 != (flags & TRANSIENT)) modifiers.add(Modifier.TRANSIENT);
282 if (0 != (flags & VOLATILE)) modifiers.add(Modifier.VOLATILE);
283 if (0 != (flags & SYNCHRONIZED))
284 modifiers.add(Modifier.SYNCHRONIZED);
285 if (0 != (flags & NATIVE)) modifiers.add(Modifier.NATIVE);
286 if (0 != (flags & STRICTFP)) modifiers.add(Modifier.STRICTFP);
287 modifiers = Collections.unmodifiableSet(modifiers);
288 modifierSets.put(flags, modifiers);
289 }
290 return modifiers;
291 }
293 // Cache of modifier sets.
294 private static Map<Long, Set<Modifier>> modifierSets =
295 new java.util.concurrent.ConcurrentHashMap<Long, Set<Modifier>>(64);
297 public static boolean isStatic(Symbol symbol) {
298 return (symbol.flags() & STATIC) != 0;
299 }
301 public static boolean isEnum(Symbol symbol) {
302 return (symbol.flags() & ENUM) != 0;
303 }
305 public static boolean isConstant(Symbol.VarSymbol symbol) {
306 return symbol.getConstValue() != null;
307 }
309 public enum Flag {
311 PUBLIC("public"),
312 PRIVATE("private"),
313 PROTECTED("protected"),
314 STATIC("static"),
315 FINAL("final"),
316 SYNCHRONIZED("synchronized"),
317 VOLATILE("volatile"),
318 TRANSIENT("transient"),
319 NATIVE("native"),
320 INTERFACE("interface"),
321 ABSTRACT("abstract"),
322 STRICTFP("strictfp"),
323 BRIDGE("bridge"),
324 SYNTHETIC("synthetic"),
325 DEPRECATED("deprecated"),
326 HASINIT("hasinit"),
327 ENUM("enum"),
328 IPROXY("iproxy"),
329 NOOUTERTHIS("noouterthis"),
330 EXISTS("exists"),
331 COMPOUND("compound"),
332 CLASS_SEEN("class_seen"),
333 SOURCE_SEEN("source_seen"),
334 LOCKED("locked"),
335 UNATTRIBUTED("unattributed"),
336 ANONCONSTR("anonconstr"),
337 ACYCLIC("acyclic"),
338 PARAMETER("parameter"),
339 VARARGS("varargs"),
340 PACKAGE("package");
342 String name;
344 Flag(String name) {
345 this.name = name;
346 }
348 public String toString() {
349 return name;
350 }
351 }
352 }