| 1 | /* |
| 2 | * Copyright 1999-2006 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 | */ |
| 25 | |
| 26 | package com.sun.tools.javac.code; |
| 27 | |
| 28 | import java.util.ArrayList; |
| 29 | import java.util.Collections; |
| 30 | import java.util.Set; |
| 31 | import java.util.concurrent.Callable; |
| 32 | import javax.lang.model.element.*; |
| 33 | import javax.lang.model.type.ReferenceType; |
| 34 | import javax.lang.model.type.TypeMirror; |
| 35 | import javax.tools.JavaFileObject; |
| 36 | |
| 37 | import com.sun.tools.javac.util.*; |
| 38 | import com.sun.tools.javac.util.Name; |
| 39 | import com.sun.tools.javac.code.Type.*; |
| 40 | import com.sun.tools.javac.comp.Attr; |
| 41 | import com.sun.tools.javac.comp.AttrContext; |
| 42 | import com.sun.tools.javac.comp.Env; |
| 43 | import com.sun.tools.javac.jvm.*; |
| 44 | import com.sun.tools.javac.model.*; |
| 45 | import com.sun.tools.javac.tree.JCTree; |
| 46 | |
| 47 | import static com.sun.tools.javac.code.Flags.*; |
| 48 | import static com.sun.tools.javac.code.Kinds.*; |
| 49 | import static com.sun.tools.javac.code.TypeTags.*; |
| 50 | |
| 51 | /** Root class for Java symbols. It contains subclasses |
| 52 | * for specific sorts of symbols, such as variables, methods and operators, |
| 53 | * types, packages. Each subclass is represented as a static inner class |
| 54 | * inside Symbol. |
| 55 | * |
| 56 | * <p><b>This is NOT part of any API supported by Sun Microsystems. If |
| 57 | * you write code that depends on this, you do so at your own risk. |
| 58 | * This code and its internal interfaces are subject to change or |
| 59 | * deletion without notice.</b> |
| 60 | */ |
| 61 | public abstract class Symbol implements Element { |
| 62 | // public Throwable debug = new Throwable(); |
| 63 | |
| 64 | /** The kind of this symbol. |
| 65 | * @see Kinds |
| 66 | */ |
| 67 | public int kind; |
| 68 | |
| 69 | /** The flags of this symbol. |
| 70 | */ |
| 71 | public long flags_field; |
| 72 | |
| 73 | /** An accessor method for the flags of this symbol. |
| 74 | * Flags of class symbols should be accessed through the accessor |
| 75 | * method to make sure that the class symbol is loaded. |
| 76 | */ |
| 77 | public long flags() { return flags_field; } |
| 78 | |
| 79 | /** The attributes of this symbol. |
| 80 | */ |
| 81 | public List<Attribute.Compound> attributes_field; |
| 82 | |
| 83 | /** An accessor method for the attributes of this symbol. |
| 84 | * Attributes of class symbols should be accessed through the accessor |
| 85 | * method to make sure that the class symbol is loaded. |
| 86 | */ |
| 87 | public List<Attribute.Compound> getAnnotationMirrors() { |
| 88 | assert attributes_field != null; |
| 89 | return attributes_field; |
| 90 | } |
| 91 | |
| 92 | /** Fetch a particular annotation from a symbol. */ |
| 93 | public Attribute.Compound attribute(Symbol anno) { |
| 94 | for (Attribute.Compound a : getAnnotationMirrors()) |
| 95 | if (a.type.tsym == anno) return a; |
| 96 | return null; |
| 97 | } |
| 98 | |
| 99 | /** The name of this symbol in Utf8 representation. |
| 100 | */ |
| 101 | public Name name; |
| 102 | |
| 103 | /** The type of this symbol. |
| 104 | */ |
| 105 | public Type type; |
| 106 | |
| 107 | /** The owner of this symbol. |
| 108 | */ |
| 109 | public Symbol owner; |
| 110 | |
| 111 | /** The completer of this symbol. |
| 112 | */ |
| 113 | public Completer completer; |
| 114 | |
| 115 | /** A cache for the type erasure of this symbol. |
| 116 | */ |
| 117 | public Type erasure_field; |
| 118 | |
| 119 | /** Construct a symbol with given kind, flags, name, type and owner. |
| 120 | */ |
| 121 | public Symbol(int kind, long flags, Name name, Type type, Symbol owner) { |
| 122 | this.kind = kind; |
| 123 | this.flags_field = flags; |
| 124 | this.type = type; |
| 125 | this.owner = owner; |
| 126 | this.completer = null; |
| 127 | this.erasure_field = null; |
| 128 | this.attributes_field = List.nil(); |
| 129 | this.name = name; |
| 130 | } |
| 131 | |
| 132 | /** Clone this symbol with new owner. |
| 133 | * Legal only for fields and methods. |
| 134 | */ |
| 135 | public Symbol clone(Symbol newOwner) { |
| 136 | throw new AssertionError(); |
| 137 | } |
| 138 | |
| 139 | /** The Java source which this symbol represents. |
| 140 | * A description of this symbol; overrides Object. |
| 141 | */ |
| 142 | public String toString() { |
| 143 | return name.toString(); |
| 144 | } |
| 145 | |
| 146 | /** A Java source description of the location of this symbol; used for |
| 147 | * error reporting. Use of this method may result in the loss of the |
| 148 | * symbol's description. |
| 149 | */ |
| 150 | public String location() { |
| 151 | if (owner.name == null || (owner.name.len == 0 && owner.kind != PCK)) { |
| 152 | return ""; |
| 153 | } |
| 154 | return owner.toString(); |
| 155 | } |
| 156 | |
| 157 | public String location(Type site, Types types) { |
| 158 | if (owner.name == null || owner.name.len == 0) { |
| 159 | return location(); |
| 160 | } |
| 161 | if (owner.type.tag == CLASS) { |
| 162 | Type ownertype = types.asOuterSuper(site, owner); |
| 163 | if (ownertype != null) return ownertype.toString(); |
| 164 | } |
| 165 | return owner.toString(); |
| 166 | } |
| 167 | |
| 168 | /** The symbol's erased type. |
| 169 | */ |
| 170 | public Type erasure(Types types) { |
| 171 | if (erasure_field == null) |
| 172 | erasure_field = types.erasure(type); |
| 173 | return erasure_field; |
| 174 | } |
| 175 | |
| 176 | /** The external type of a symbol. This is the symbol's erased type |
| 177 | * except for constructors of inner classes which get the enclosing |
| 178 | * instance class added as first argument. |
| 179 | */ |
| 180 | public Type externalType(Types types) { |
| 181 | Type t = erasure(types); |
| 182 | if (name == name.table.init && owner.hasOuterInstance()) { |
| 183 | Type outerThisType = types.erasure(owner.type.getEnclosingType()); |
| 184 | return new MethodType(t.getParameterTypes().prepend(outerThisType), |
| 185 | t.getReturnType(), |
| 186 | t.getThrownTypes(), |
| 187 | t.tsym); |
| 188 | } else { |
| 189 | return t; |
| 190 | } |
| 191 | } |
| 192 | |
| 193 | public boolean isStatic() { |
| 194 | return |
| 195 | (flags() & STATIC) != 0 || |
| 196 | (owner.flags() & INTERFACE) != 0 && kind != MTH; |
| 197 | } |
| 198 | |
| 199 | public boolean isInterface() { |
| 200 | return (flags() & INTERFACE) != 0; |
| 201 | } |
| 202 | |
| 203 | /** Is this symbol declared (directly or indirectly) local |
| 204 | * to a method or variable initializer? |
| 205 | * Also includes fields of inner classes which are in |
| 206 | * turn local to a method or variable initializer. |
| 207 | */ |
| 208 | public boolean isLocal() { |
| 209 | return |
| 210 | (owner.kind & (VAR | MTH)) != 0 || |
| 211 | (owner.kind == TYP && owner.isLocal()); |
| 212 | } |
| 213 | |
| 214 | /** Is this symbol a constructor? |
| 215 | */ |
| 216 | public boolean isConstructor() { |
| 217 | return name == name.table.init; |
| 218 | } |
| 219 | |
| 220 | /** The fully qualified name of this symbol. |
| 221 | * This is the same as the symbol's name except for class symbols, |
| 222 | * which are handled separately. |
| 223 | */ |
| 224 | public Name getQualifiedName() { |
| 225 | return name; |
| 226 | } |
| 227 | |
| 228 | /** The fully qualified name of this symbol after converting to flat |
| 229 | * representation. This is the same as the symbol's name except for |
| 230 | * class symbols, which are handled separately. |
| 231 | */ |
| 232 | public Name flatName() { |
| 233 | return getQualifiedName(); |
| 234 | } |
| 235 | |
| 236 | /** If this is a class or package, its members, otherwise null. |
| 237 | */ |
| 238 | public Scope members() { |
| 239 | return null; |
| 240 | } |
| 241 | |
| 242 | /** A class is an inner class if it it has an enclosing instance class. |
| 243 | */ |
| 244 | public boolean isInner() { |
| 245 | return type.getEnclosingType().tag == CLASS; |
| 246 | } |
| 247 | |
| 248 | /** An inner class has an outer instance if it is not an interface |
| 249 | * it has an enclosing instance class which might be referenced from the class. |
| 250 | * Nested classes can see instance members of their enclosing class. |
| 251 | * Their constructors carry an additional this$n parameter, inserted |
| 252 | * implicitly by the compiler. |
| 253 | * |
| 254 | * @see #isInner |
| 255 | */ |
| 256 | public boolean hasOuterInstance() { |
| 257 | return |
| 258 | type.getEnclosingType().tag == CLASS && (flags() & (INTERFACE | NOOUTERTHIS)) == 0; |
| 259 | } |
| 260 | |
| 261 | /** The closest enclosing class of this symbol's declaration. |
| 262 | */ |
| 263 | public ClassSymbol enclClass() { |
| 264 | Symbol c = this; |
| 265 | while (c != null && |
| 266 | ((c.kind & TYP) == 0 || c.type.tag != CLASS)) { |
| 267 | c = c.owner; |
| 268 | } |
| 269 | return (ClassSymbol)c; |
| 270 | } |
| 271 | |
| 272 | /** The outermost class which indirectly owns this symbol. |
| 273 | */ |
| 274 | public ClassSymbol outermostClass() { |
| 275 | Symbol sym = this; |
| 276 | Symbol prev = null; |
| 277 | while (sym.kind != PCK) { |
| 278 | prev = sym; |
| 279 | sym = sym.owner; |
| 280 | } |
| 281 | return (ClassSymbol) prev; |
| 282 | } |
| 283 | |
| 284 | /** The package which indirectly owns this symbol. |
| 285 | */ |
| 286 | public PackageSymbol packge() { |
| 287 | Symbol sym = this; |
| 288 | while (sym.kind != PCK) { |
| 289 | sym = sym.owner; |
| 290 | } |
| 291 | return (PackageSymbol) sym; |
| 292 | } |
| 293 | |
| 294 | /** Is this symbol a subclass of `base'? Only defined for ClassSymbols. |
| 295 | */ |
| 296 | public boolean isSubClass(Symbol base, Types types) { |
| 297 | throw new AssertionError("isSubClass " + this); |
| 298 | } |
| 299 | |
| 300 | /** Fully check membership: hierarchy, protection, and hiding. |
| 301 | * Does not exclude methods not inherited due to overriding. |
| 302 | */ |
| 303 | public boolean isMemberOf(TypeSymbol clazz, Types types) { |
| 304 | return |
| 305 | owner == clazz || |
| 306 | clazz.isSubClass(owner, types) && |
| 307 | isInheritedIn(clazz, types) && |
| 308 | !hiddenIn((ClassSymbol)clazz, types); |
| 309 | } |
| 310 | |
| 311 | /** Is this symbol the same as or enclosed by the given class? */ |
| 312 | public boolean isEnclosedBy(ClassSymbol clazz) { |
| 313 | for (Symbol sym = this; sym.kind != PCK; sym = sym.owner) |
| 314 | if (sym == clazz) return true; |
| 315 | return false; |
| 316 | } |
| 317 | |
| 318 | /** Check for hiding. Note that this doesn't handle multiple |
| 319 | * (interface) inheritance. */ |
| 320 | private boolean hiddenIn(ClassSymbol clazz, Types types) { |
| 321 | if (kind == MTH && (flags() & STATIC) == 0) return false; |
| 322 | while (true) { |
| 323 | if (owner == clazz) return false; |
| 324 | Scope.Entry e = clazz.members().lookup(name); |
| 325 | while (e.scope != null) { |
| 326 | if (e.sym == this) return false; |
| 327 | if (e.sym.kind == kind && |
| 328 | (kind != MTH || |
| 329 | (e.sym.flags() & STATIC) != 0 && |
| 330 | types.isSubSignature(e.sym.type, type))) |
| 331 | return true; |
| 332 | e = e.next(); |
| 333 | } |
| 334 | Type superType = types.supertype(clazz.type); |
| 335 | if (superType.tag != TypeTags.CLASS) return false; |
| 336 | clazz = (ClassSymbol)superType.tsym; |
| 337 | } |
| 338 | } |
| 339 | |
| 340 | /** Is this symbol inherited into a given class? |
| 341 | * PRE: If symbol's owner is a interface, |
| 342 | * it is already assumed that the interface is a superinterface |
| 343 | * of given class. |
| 344 | * @param clazz The class for which we want to establish membership. |
| 345 | * This must be a subclass of the member's owner. |
| 346 | */ |
| 347 | public boolean isInheritedIn(Symbol clazz, Types types) { |
| 348 | switch ((int)(flags_field & Flags.AccessFlags)) { |
| 349 | default: // error recovery |
| 350 | case PUBLIC: |
| 351 | return true; |
| 352 | case PRIVATE: |
| 353 | return this.owner == clazz; |
| 354 | case PROTECTED: |
| 355 | // we model interfaces as extending Object |
| 356 | return (clazz.flags() & INTERFACE) == 0; |
| 357 | case 0: |
| 358 | PackageSymbol thisPackage = this.packge(); |
| 359 | for (Symbol sup = clazz; |
| 360 | sup != null && sup != this.owner; |
| 361 | sup = types.supertype(sup.type).tsym) { |
| 362 | if (sup.type.isErroneous()) |
| 363 | return true; // error recovery |
| 364 | if ((sup.flags() & COMPOUND) != 0) |
| 365 | continue; |
| 366 | if (sup.packge() != thisPackage) |
| 367 | return false; |
| 368 | } |
| 369 | return (clazz.flags() & INTERFACE) == 0; |
| 370 | } |
| 371 | } |
| 372 | |
| 373 | /** The (variable or method) symbol seen as a member of given |
| 374 | * class type`site' (this might change the symbol's type). |
| 375 | * This is used exclusively for producing diagnostics. |
| 376 | */ |
| 377 | public Symbol asMemberOf(Type site, Types types) { |
| 378 | throw new AssertionError(); |
| 379 | } |
| 380 | |
| 381 | /** Does this method symbol override `other' symbol, when both are seen as |
| 382 | * members of class `origin'? It is assumed that _other is a member |
| 383 | * of origin. |
| 384 | * |
| 385 | * It is assumed that both symbols have the same name. The static |
| 386 | * modifier is ignored for this test. |
| 387 | * |
| 388 | * See JLS 8.4.6.1 (without transitivity) and 8.4.6.4 |
| 389 | */ |
| 390 | public boolean overrides(Symbol _other, TypeSymbol origin, Types types, boolean checkResult) { |
| 391 | return false; |
| 392 | } |
| 393 | |
| 394 | /** Complete the elaboration of this symbol's definition. |
| 395 | */ |
| 396 | public void complete() throws CompletionFailure { |
| 397 | if (completer != null) { |
| 398 | Completer c = completer; |
| 399 | completer = null; |
| 400 | c.complete(this); |
| 401 | } |
| 402 | } |
| 403 | |
| 404 | /** True if the symbol represents an entity that exists. |
| 405 | */ |
| 406 | public boolean exists() { |
| 407 | return true; |
| 408 | } |
| 409 | |
| 410 | public Type asType() { |
| 411 | return type; |
| 412 | } |
| 413 | |
| 414 | public Symbol getEnclosingElement() { |
| 415 | return owner; |
| 416 | } |
| 417 | |
| 418 | public ElementKind getKind() { |
| 419 | return ElementKind.OTHER; // most unkind |
| 420 | } |
| 421 | |
| 422 | public Set<Modifier> getModifiers() { |
| 423 | return Flags.asModifierSet(flags()); |
| 424 | } |
| 425 | |
| 426 | public Name getSimpleName() { |
| 427 | return name; |
| 428 | } |
| 429 | |
| 430 | /** |
| 431 | * @deprecated this method should never be used by javac internally. |
| 432 | */ |
| 433 | @Deprecated |
| 434 | public <A extends java.lang.annotation.Annotation> A getAnnotation(Class<A> annoType) { |
| 435 | return JavacElements.getAnnotation(this, annoType); |
| 436 | } |
| 437 | |
| 438 | // TODO: getEnclosedElements should return a javac List, fix in FilteredMemberList |
| 439 | public java.util.List<Symbol> getEnclosedElements() { |
| 440 | return List.nil(); |
| 441 | } |
| 442 | |
| 443 | public List<TypeSymbol> getTypeParameters() { |
| 444 | ListBuffer<TypeSymbol> l = ListBuffer.lb(); |
| 445 | for (Type t : type.getTypeArguments()) { |
| 446 | l.append(t.tsym); |
| 447 | } |
| 448 | return l.toList(); |
| 449 | } |
| 450 | |
| 451 | public static class DelegatedSymbol extends Symbol { |
| 452 | protected Symbol other; |
| 453 | public DelegatedSymbol(Symbol other) { |
| 454 | super(other.kind, other.flags_field, other.name, other.type, other.owner); |
| 455 | this.other = other; |
| 456 | } |
| 457 | public String toString() { return other.toString(); } |
| 458 | public String location() { return other.location(); } |
| 459 | public String location(Type site, Types types) { return other.location(site, types); } |
| 460 | public Type erasure(Types types) { return other.erasure(types); } |
| 461 | public Type externalType(Types types) { return other.externalType(types); } |
| 462 | public boolean isLocal() { return other.isLocal(); } |
| 463 | public boolean isConstructor() { return other.isConstructor(); } |
| 464 | public Name getQualifiedName() { return other.getQualifiedName(); } |
| 465 | public Name flatName() { return other.flatName(); } |
| 466 | public Scope members() { return other.members(); } |
| 467 | public boolean isInner() { return other.isInner(); } |
| 468 | public boolean hasOuterInstance() { return other.hasOuterInstance(); } |
| 469 | public ClassSymbol enclClass() { return other.enclClass(); } |
| 470 | public ClassSymbol outermostClass() { return other.outermostClass(); } |
| 471 | public PackageSymbol packge() { return other.packge(); } |
| 472 | public boolean isSubClass(Symbol base, Types types) { return other.isSubClass(base, types); } |
| 473 | public boolean isMemberOf(TypeSymbol clazz, Types types) { return other.isMemberOf(clazz, types); } |
| 474 | public boolean isEnclosedBy(ClassSymbol clazz) { return other.isEnclosedBy(clazz); } |
| 475 | public boolean isInheritedIn(Symbol clazz, Types types) { return other.isInheritedIn(clazz, types); } |
| 476 | public Symbol asMemberOf(Type site, Types types) { return other.asMemberOf(site, types); } |
| 477 | public void complete() throws CompletionFailure { other.complete(); } |
| 478 | |
| 479 | public <R, P> R accept(ElementVisitor<R, P> v, P p) { |
| 480 | return other.accept(v, p); |
| 481 | } |
| 482 | } |
| 483 | |
| 484 | /** A class for type symbols. Type variables are represented by instances |
| 485 | * of this class, classes and packages by instances of subclasses. |
| 486 | */ |
| 487 | public static class TypeSymbol |
| 488 | extends Symbol implements TypeParameterElement { |
| 489 | // Implements TypeParameterElement because type parameters don't |
| 490 | // have their own TypeSymbol subclass. |
| 491 | // TODO: type parameters should have their own TypeSymbol subclass |
| 492 | |
| 493 | public TypeSymbol(long flags, Name name, Type type, Symbol owner) { |
| 494 | super(TYP, flags, name, type, owner); |
| 495 | } |
| 496 | |
| 497 | /** form a fully qualified name from a name and an owner |
| 498 | */ |
| 499 | static public Name formFullName(Name name, Symbol owner) { |
| 500 | if (owner == null) return name; |
| 501 | if (((owner.kind != ERR)) && |
| 502 | ((owner.kind & (VAR | MTH)) != 0 |
| 503 | || (owner.kind == TYP && owner.type.tag == TYPEVAR) |
| 504 | )) return name; |
| 505 | Name prefix = owner.getQualifiedName(); |
| 506 | if (prefix == null || prefix == prefix.table.empty) |
| 507 | return name; |
| 508 | else return prefix.append('.', name); |
| 509 | } |
| 510 | |
| 511 | /** form a fully qualified name from a name and an owner, after |
| 512 | * converting to flat representation |
| 513 | */ |
| 514 | static public Name formFlatName(Name name, Symbol owner) { |
| 515 | if (owner == null || |
| 516 | (owner.kind & (VAR | MTH)) != 0 |
| 517 | || (owner.kind == TYP && owner.type.tag == TYPEVAR) |
| 518 | ) return name; |
| 519 | char sep = owner.kind == TYP ? '$' : '.'; |
| 520 | Name prefix = owner.flatName(); |
| 521 | if (prefix == null || prefix == prefix.table.empty) |
| 522 | return name; |
| 523 | else return prefix.append(sep, name); |
| 524 | } |
| 525 | |
| 526 | /** |
| 527 | * A total ordering between type symbols that refines the |
| 528 | * class inheritance graph. |
| 529 | * |
| 530 | * Typevariables always precede other kinds of symbols. |
| 531 | */ |
| 532 | public final boolean precedes(TypeSymbol that, Types types) { |
| 533 | if (this == that) |
| 534 | return false; |
| 535 | if (this.type.tag == that.type.tag) { |
| 536 | if (this.type.tag == CLASS) { |
| 537 | return |
| 538 | types.rank(that.type) < types.rank(this.type) || |
| 539 | types.rank(that.type) == types.rank(this.type) && |
| 540 | that.getQualifiedName().compareTo(this.getQualifiedName()) < 0; |
| 541 | } else if (this.type.tag == TYPEVAR) { |
| 542 | return types.isSubtype(this.type, that.type); |
| 543 | } |
| 544 | } |
| 545 | return this.type.tag == TYPEVAR; |
| 546 | } |
| 547 | |
| 548 | // For type params; overridden in subclasses. |
| 549 | public ElementKind getKind() { |
| 550 | return ElementKind.TYPE_PARAMETER; |
| 551 | } |
| 552 | |
| 553 | public java.util.List<Symbol> getEnclosedElements() { |
| 554 | List<Symbol> list = List.nil(); |
| 555 | for (Scope.Entry e = members().elems; e != null; e = e.sibling) { |
| 556 | if (e.sym != null && (e.sym.flags() & SYNTHETIC) == 0 && e.sym.owner == this) |
| 557 | list = list.prepend(e.sym); |
| 558 | } |
| 559 | return list; |
| 560 | } |
| 561 | |
| 562 | // For type params. |
| 563 | // Perhaps not needed if getEnclosingElement can be spec'ed |
| 564 | // to do the same thing. |
| 565 | // TODO: getGenericElement() might not be needed |
| 566 | public Symbol getGenericElement() { |
| 567 | return owner; |
| 568 | } |
| 569 | |
| 570 | public <R, P> R accept(ElementVisitor<R, P> v, P p) { |
| 571 | assert type.tag == TYPEVAR; // else override will be invoked |
| 572 | return v.visitTypeParameter(this, p); |
| 573 | } |
| 574 | |
| 575 | public List<Type> getBounds() { |
| 576 | TypeVar t = (TypeVar)type; |
| 577 | Type bound = t.getUpperBound(); |
| 578 | if (!bound.isCompound()) |
| 579 | return List.of(bound); |
| 580 | ClassType ct = (ClassType)bound; |
| 581 | if (!ct.tsym.erasure_field.isInterface()) { |
| 582 | return ct.interfaces_field.prepend(ct.supertype_field); |
| 583 | } else { |
| 584 | // No superclass was given in bounds. |
| 585 | // In this case, supertype is Object, erasure is first interface. |
| 586 | return ct.interfaces_field; |
| 587 | } |
| 588 | } |
| 589 | } |
| 590 | |
| 591 | /** A class for package symbols |
| 592 | */ |
| 593 | public static class PackageSymbol extends TypeSymbol |
| 594 | implements PackageElement { |
| 595 | |
| 596 | public Scope members_field; |
| 597 | public Name fullname; |
| 598 | public ClassSymbol package_info; // see bug 6443073 |
| 599 | |
| 600 | public PackageSymbol(Name name, Type type, Symbol owner) { |
| 601 | super(0, name, type, owner); |
| 602 | this.kind = PCK; |
| 603 | this.members_field = null; |
| 604 | this.fullname = formFullName(name, owner); |
| 605 | } |
| 606 | |
| 607 | public PackageSymbol(Name name, Symbol owner) { |
| 608 | this(name, null, owner); |
| 609 | this.type = new PackageType(this); |
| 610 | } |
| 611 | |
| 612 | public String toString() { |
| 613 | return fullname.toString(); |
| 614 | } |
| 615 | |
| 616 | public Name getQualifiedName() { |
| 617 | return fullname; |
| 618 | } |
| 619 | |
| 620 | public boolean isUnnamed() { |
| 621 | return name.isEmpty() && owner != null; |
| 622 | } |
| 623 | |
| 624 | public Scope members() { |
| 625 | if (completer != null) complete(); |
| 626 | return members_field; |
| 627 | } |
| 628 | |
| 629 | public long flags() { |
| 630 | if (completer != null) complete(); |
| 631 | return flags_field; |
| 632 | } |
| 633 | |
| 634 | public List<Attribute.Compound> getAnnotationMirrors() { |
| 635 | if (completer != null) complete(); |
| 636 | assert attributes_field != null; |
| 637 | return attributes_field; |
| 638 | } |
| 639 | |
| 640 | /** A package "exists" if a type or package that exists has |
| 641 | * been seen within it. |
| 642 | */ |
| 643 | public boolean exists() { |
| 644 | return (flags_field & EXISTS) != 0; |
| 645 | } |
| 646 | |
| 647 | public ElementKind getKind() { |
| 648 | return ElementKind.PACKAGE; |
| 649 | } |
| 650 | |
| 651 | public Symbol getEnclosingElement() { |
| 652 | return null; |
| 653 | } |
| 654 | |
| 655 | public <R, P> R accept(ElementVisitor<R, P> v, P p) { |
| 656 | return v.visitPackage(this, p); |
| 657 | } |
| 658 | } |
| 659 | |
| 660 | /** A class for class symbols |
| 661 | */ |
| 662 | public static class ClassSymbol extends TypeSymbol implements TypeElement { |
| 663 | |
| 664 | /** a scope for all class members; variables, methods and inner classes |
| 665 | * type parameters are not part of this scope |
| 666 | */ |
| 667 | public Scope members_field; |
| 668 | |
| 669 | /** the fully qualified name of the class, i.e. pck.outer.inner. |
| 670 | * null for anonymous classes |
| 671 | */ |
| 672 | public Name fullname; |
| 673 | |
| 674 | /** the fully qualified name of the class after converting to flat |
| 675 | * representation, i.e. pck.outer$inner, |
| 676 | * set externally for local and anonymous classes |
| 677 | */ |
| 678 | public Name flatname; |
| 679 | |
| 680 | /** the sourcefile where the class came from |
| 681 | */ |
| 682 | public JavaFileObject sourcefile; |
| 683 | |
| 684 | /** the classfile from where to load this class |
| 685 | * this will have extension .class or .java |
| 686 | */ |
| 687 | public JavaFileObject classfile; |
| 688 | |
| 689 | /** the constant pool of the class |
| 690 | */ |
| 691 | public Pool pool; |
| 692 | |
| 693 | public ClassSymbol(long flags, Name name, Type type, Symbol owner) { |
| 694 | super(flags, name, type, owner); |
| 695 | this.members_field = null; |
| 696 | this.fullname = formFullName(name, owner); |
| 697 | this.flatname = formFlatName(name, owner); |
| 698 | this.sourcefile = null; |
| 699 | this.classfile = null; |
| 700 | this.pool = null; |
| 701 | } |
| 702 | |
| 703 | public ClassSymbol(long flags, Name name, Symbol owner) { |
| 704 | this( |
| 705 | flags, |
| 706 | name, |
| 707 | new ClassType(Type.noType, null, null), |
| 708 | owner); |
| 709 | this.type.tsym = this; |
| 710 | } |
| 711 | |
| 712 | /** The Java source which this symbol represents. |
| 713 | */ |
| 714 | public String toString() { |
| 715 | return className(); |
| 716 | } |
| 717 | |
| 718 | public long flags() { |
| 719 | if (completer != null) complete(); |
| 720 | return flags_field; |
| 721 | } |
| 722 | |
| 723 | public Scope members() { |
| 724 | if (completer != null) complete(); |
| 725 | return members_field; |
| 726 | } |
| 727 | |
| 728 | public List<Attribute.Compound> getAnnotationMirrors() { |
| 729 | if (completer != null) complete(); |
| 730 | assert attributes_field != null; |
| 731 | return attributes_field; |
| 732 | } |
| 733 | |
| 734 | public Type erasure(Types types) { |
| 735 | if (erasure_field == null) |
| 736 | erasure_field = new ClassType(types.erasure(type.getEnclosingType()), |
| 737 | List.<Type>nil(), this); |
| 738 | return erasure_field; |
| 739 | } |
| 740 | |
| 741 | public String className() { |
| 742 | if (name.len == 0) |
| 743 | return |
| 744 | Log.getLocalizedString("anonymous.class", flatname); |
| 745 | else |
| 746 | return fullname.toString(); |
| 747 | } |
| 748 | |
| 749 | public Name getQualifiedName() { |
| 750 | return fullname; |
| 751 | } |
| 752 | |
| 753 | public Name flatName() { |
| 754 | return flatname; |
| 755 | } |
| 756 | |
| 757 | public boolean isSubClass(Symbol base, Types types) { |
| 758 | if (this == base) { |
| 759 | return true; |
| 760 | } else if ((base.flags() & INTERFACE) != 0) { |
| 761 | for (Type t = type; t.tag == CLASS; t = types.supertype(t)) |
| 762 | for (List<Type> is = types.interfaces(t); |
| 763 | is.nonEmpty(); |
| 764 | is = is.tail) |
| 765 | if (is.head.tsym.isSubClass(base, types)) return true; |
| 766 | } else { |
| 767 | for (Type t = type; t.tag == CLASS; t = types.supertype(t)) |
| 768 | if (t.tsym == base) return true; |
| 769 | } |
| 770 | return false; |
| 771 | } |
| 772 | |
| 773 | /** Complete the elaboration of this symbol's definition. |
| 774 | */ |
| 775 | public void complete() throws CompletionFailure { |
| 776 | try { |
| 777 | super.complete(); |
| 778 | } catch (CompletionFailure ex) { |
| 779 | // quiet error recovery |
| 780 | flags_field |= (PUBLIC|STATIC); |
| 781 | this.type = new ErrorType(this); |
| 782 | throw ex; |
| 783 | } |
| 784 | } |
| 785 | |
| 786 | public List<Type> getInterfaces() { |
| 787 | complete(); |
| 788 | if (type instanceof ClassType) { |
| 789 | ClassType t = (ClassType)type; |
| 790 | if (t.interfaces_field == null) // FIXME: shouldn't be null |
| 791 | t.interfaces_field = List.nil(); |
| 792 | return t.interfaces_field; |
| 793 | } else { |
| 794 | return List.nil(); |
| 795 | } |
| 796 | } |
| 797 | |
| 798 | public Type getSuperclass() { |
| 799 | complete(); |
| 800 | if (type instanceof ClassType) { |
| 801 | ClassType t = (ClassType)type; |
| 802 | if (t.supertype_field == null) // FIXME: shouldn't be null |
| 803 | t.supertype_field = Type.noType; |
| 804 | // An interface has no superclass; its supertype is Object. |
| 805 | return t.isInterface() |
| 806 | ? Type.noType |
| 807 | : t.supertype_field; |
| 808 | } else { |
| 809 | return Type.noType; |
| 810 | } |
| 811 | } |
| 812 | |
| 813 | public ElementKind getKind() { |
| 814 | long flags = flags(); |
| 815 | if ((flags & ANNOTATION) != 0) |
| 816 | return ElementKind.ANNOTATION_TYPE; |
| 817 | else if ((flags & INTERFACE) != 0) |
| 818 | return ElementKind.INTERFACE; |
| 819 | else if ((flags & ENUM) != 0) |
| 820 | return ElementKind.ENUM; |
| 821 | else |
| 822 | return ElementKind.CLASS; |
| 823 | } |
| 824 | |
| 825 | public NestingKind getNestingKind() { |
| 826 | complete(); |
| 827 | if (owner.kind == PCK) |
| 828 | return NestingKind.TOP_LEVEL; |
| 829 | else if (name.isEmpty()) |
| 830 | return NestingKind.ANONYMOUS; |
| 831 | else if (owner.kind == MTH) |
| 832 | return NestingKind.LOCAL; |
| 833 | else |
| 834 | return NestingKind.MEMBER; |
| 835 | } |
| 836 | |
| 837 | /** |
| 838 | * @deprecated this method should never be used by javac internally. |
| 839 | */ |
| 840 | @Override @Deprecated |
| 841 | public <A extends java.lang.annotation.Annotation> A getAnnotation(Class<A> annoType) { |
| 842 | return JavacElements.getAnnotation(this, annoType); |
| 843 | } |
| 844 | |
| 845 | public <R, P> R accept(ElementVisitor<R, P> v, P p) { |
| 846 | return v.visitType(this, p); |
| 847 | } |
| 848 | } |
| 849 | |
| 850 | |
| 851 | /** A class for variable symbols |
| 852 | */ |
| 853 | public static class VarSymbol extends Symbol implements VariableElement { |
| 854 | |
| 855 | /** The variable's declaration position. |
| 856 | */ |
| 857 | public int pos = Position.NOPOS; |
| 858 | |
| 859 | /** The variable's address. Used for different purposes during |
| 860 | * flow analysis, translation and code generation. |
| 861 | * Flow analysis: |
| 862 | * If this is a blank final or local variable, its sequence number. |
| 863 | * Translation: |
| 864 | * If this is a private field, its access number. |
| 865 | * Code generation: |
| 866 | * If this is a local variable, its logical slot number. |
| 867 | */ |
| 868 | public int adr = -1; |
| 869 | |
| 870 | /** Construct a variable symbol, given its flags, name, type and owner. |
| 871 | */ |
| 872 | public VarSymbol(long flags, Name name, Type type, Symbol owner) { |
| 873 | super(VAR, flags, name, type, owner); |
| 874 | } |
| 875 | |
| 876 | /** Clone this symbol with new owner. |
| 877 | */ |
| 878 | public VarSymbol clone(Symbol newOwner) { |
| 879 | VarSymbol v = new VarSymbol(flags_field, name, type, newOwner); |
| 880 | v.pos = pos; |
| 881 | v.adr = adr; |
| 882 | v.data = data; |
| 883 | // System.out.println("clone " + v + " in " + newOwner);//DEBUG |
| 884 | return v; |
| 885 | } |
| 886 | |
| 887 | public String toString() { |
| 888 | return name.toString(); |
| 889 | } |
| 890 | |
| 891 | public Symbol asMemberOf(Type site, Types types) { |
| 892 | return new VarSymbol(flags_field, name, types.memberType(site, this), owner); |
| 893 | } |
| 894 | |
| 895 | public ElementKind getKind() { |
| 896 | long flags = flags(); |
| 897 | if ((flags & PARAMETER) != 0) { |
| 898 | if (isExceptionParameter()) |
| 899 | return ElementKind.EXCEPTION_PARAMETER; |
| 900 | else |
| 901 | return ElementKind.PARAMETER; |
| 902 | } else if ((flags & ENUM) != 0) { |
| 903 | return ElementKind.ENUM_CONSTANT; |
| 904 | } else if (owner.kind == TYP || owner.kind == ERR) { |
| 905 | return ElementKind.FIELD; |
| 906 | } else { |
| 907 | return ElementKind.LOCAL_VARIABLE; |
| 908 | } |
| 909 | } |
| 910 | |
| 911 | public <R, P> R accept(ElementVisitor<R, P> v, P p) { |
| 912 | return v.visitVariable(this, p); |
| 913 | } |
| 914 | |
| 915 | public Object getConstantValue() { // Mirror API |
| 916 | return Constants.decode(getConstValue(), type); |
| 917 | } |
| 918 | |
| 919 | public void setLazyConstValue(final Env<AttrContext> env, |
| 920 | final Log log, |
| 921 | final Attr attr, |
| 922 | final JCTree.JCExpression initializer) |
| 923 | { |
| 924 | setData(new Callable<Object>() { |
| 925 | public Object call() { |
| 926 | JavaFileObject source = log.useSource(env.toplevel.sourcefile); |
| 927 | try { |
| 928 | // In order to catch self-references, we set |
| 929 | // the variable's declaration position to |
| 930 | // maximal possible value, effectively marking |
| 931 | // the variable as undefined. |
| 932 | int pos = VarSymbol.this.pos; |
| 933 | VarSymbol.this.pos = Position.MAXPOS; |
| 934 | Type itype = attr.attribExpr(initializer, env, type); |
| 935 | VarSymbol.this.pos = pos; |
| 936 | if (itype.constValue() != null) |
| 937 | return attr.coerce(itype, type).constValue(); |
| 938 | else |
| 939 | return null; |
| 940 | } finally { |
| 941 | log.useSource(source); |
| 942 | } |
| 943 | } |
| 944 | }); |
| 945 | } |
| 946 | |
| 947 | /** |
| 948 | * The variable's constant value, if this is a constant. |
| 949 | * Before the constant value is evaluated, it points to an |
| 950 | * initalizer environment. If this is not a constant, it can |
| 951 | * be used for other stuff. |
| 952 | */ |
| 953 | private Object data; |
| 954 | |
| 955 | public boolean isExceptionParameter() { |
| 956 | return data == ElementKind.EXCEPTION_PARAMETER; |
| 957 | } |
| 958 | |
| 959 | public Object getConstValue() { |
| 960 | // TODO: Consider if getConstValue and getConstantValue can be collapsed |
| 961 | if (data == ElementKind.EXCEPTION_PARAMETER) { |
| 962 | return null; |
| 963 | } else if (data instanceof Callable<?>) { |
| 964 | // In this case, this is final a variable, with an as |
| 965 | // yet unevaluated initializer. |
| 966 | Callable<?> eval = (Callable<?>)data; |
| 967 | data = null; // to make sure we don't evaluate this twice. |
| 968 | try { |
| 969 | data = eval.call(); |
| 970 | } catch (Exception ex) { |
| 971 | throw new AssertionError(ex); |
| 972 | } |
| 973 | } |
| 974 | return data; |
| 975 | } |
| 976 | |
| 977 | public void setData(Object data) { |
| 978 | assert !(data instanceof Env<?>) : this; |
| 979 | this.data = data; |
| 980 | } |
| 981 | } |
| 982 | |
| 983 | /** A class for method symbols. |
| 984 | */ |
| 985 | public static class MethodSymbol extends Symbol implements ExecutableElement { |
| 986 | |
| 987 | /** The code of the method. */ |
| 988 | public Code code = null; |
| 989 | |
| 990 | /** The parameters of the method. */ |
| 991 | public List<VarSymbol> params = null; |
| 992 | |
| 993 | /** The names of the parameters */ |
| 994 | public List<Name> savedParameterNames; |
| 995 | |
| 996 | /** For an attribute field accessor, its default value if any. |
| 997 | * The value is null if none appeared in the method |
| 998 | * declaration. |
| 999 | */ |
| 1000 | public Attribute defaultValue = null; |
| 1001 | |
| 1002 | /** Construct a method symbol, given its flags, name, type and owner. |
| 1003 | */ |
| 1004 | public MethodSymbol(long flags, Name name, Type type, Symbol owner) { |
| 1005 | super(MTH, flags, name, type, owner); |
| 1006 | assert owner.type.tag != TYPEVAR : owner + "." + name; |
| 1007 | } |
| 1008 | |
| 1009 | /** Clone this symbol with new owner. |
| 1010 | */ |
| 1011 | public MethodSymbol clone(Symbol newOwner) { |
| 1012 | MethodSymbol m = new MethodSymbol(flags_field, name, type, newOwner); |
| 1013 | m.code = code; |
| 1014 | return m; |
| 1015 | } |
| 1016 | |
| 1017 | /** The Java source which this symbol represents. |
| 1018 | */ |
| 1019 | public String toString() { |
| 1020 | if ((flags() & BLOCK) != 0) { |
| 1021 | return owner.name.toString(); |
| 1022 | } else { |
| 1023 | String s = (name == name.table.init) |
| 1024 | ? owner.name.toString() |
| 1025 | : name.toString(); |
| 1026 | if (type != null) { |
| 1027 | if (type.tag == FORALL) |
| 1028 | s = "<" + ((ForAll)type).getTypeArguments() + ">" + s; |
| 1029 | s += "(" + type.argtypes((flags() & VARARGS) != 0) + ")"; |
| 1030 | } |
| 1031 | return s; |
| 1032 | } |
| 1033 | } |
| 1034 | |
| 1035 | /** find a symbol that this (proxy method) symbol implements. |
| 1036 | * @param c The class whose members are searched for |
| 1037 | * implementations |
| 1038 | */ |
| 1039 | public Symbol implemented(TypeSymbol c, Types types) { |
| 1040 | Symbol impl = null; |
| 1041 | for (List<Type> is = types.interfaces(c.type); |
| 1042 | impl == null && is.nonEmpty(); |
| 1043 | is = is.tail) { |
| 1044 | TypeSymbol i = is.head.tsym; |
| 1045 | for (Scope.Entry e = i.members().lookup(name); |
| 1046 | impl == null && e.scope != null; |
| 1047 | e = e.next()) { |
| 1048 | if (this.overrides(e.sym, (TypeSymbol)owner, types, true) && |
| 1049 | // FIXME: I suspect the following requires a |
| 1050 | // subst() for a parametric return type. |
| 1051 | types.isSameType(type.getReturnType(), |
| 1052 | types.memberType(owner.type, e.sym).getReturnType())) { |
| 1053 | impl = e.sym; |
| 1054 | } |
| 1055 | if (impl == null) |
| 1056 | impl = implemented(i, types); |
| 1057 | } |
| 1058 | } |
| 1059 | return impl; |
| 1060 | } |
| 1061 | |
| 1062 | /** Will the erasure of this method be considered by the VM to |
| 1063 | * override the erasure of the other when seen from class `origin'? |
| 1064 | */ |
| 1065 | public boolean binaryOverrides(Symbol _other, TypeSymbol origin, Types types) { |
| 1066 | if (isConstructor() || _other.kind != MTH) return false; |
| 1067 | |
| 1068 | if (this == _other) return true; |
| 1069 | MethodSymbol other = (MethodSymbol)_other; |
| 1070 | |
| 1071 | // check for a direct implementation |
| 1072 | if (other.isOverridableIn((TypeSymbol)owner) && |
| 1073 | types.asSuper(owner.type, other.owner) != null && |
| 1074 | types.isSameType(erasure(types), other.erasure(types))) |
| 1075 | return true; |
| 1076 | |
| 1077 | // check for an inherited implementation |
| 1078 | return |
| 1079 | (flags() & ABSTRACT) == 0 && |
| 1080 | other.isOverridableIn(origin) && |
| 1081 | this.isMemberOf(origin, types) && |
| 1082 | types.isSameType(erasure(types), other.erasure(types)); |
| 1083 | } |
| 1084 | |
| 1085 | /** The implementation of this (abstract) symbol in class origin, |
| 1086 | * from the VM's point of view, null if method does not have an |
| 1087 | * implementation in class. |
| 1088 | * @param origin The class of which the implementation is a member. |
| 1089 | */ |
| 1090 | public MethodSymbol binaryImplementation(ClassSymbol origin, Types types) { |
| 1091 | for (TypeSymbol c = origin; c != null; c = types.supertype(c.type).tsym) { |
| 1092 | for (Scope.Entry e = c.members().lookup(name); |
| 1093 | e.scope != null; |
| 1094 | e = e.next()) { |
| 1095 | if (e.sym.kind == MTH && |
| 1096 | ((MethodSymbol)e.sym).binaryOverrides(this, origin, types)) |
| 1097 | return (MethodSymbol)e.sym; |
| 1098 | } |
| 1099 | } |
| 1100 | return null; |
| 1101 | } |
| 1102 | |
| 1103 | /** Does this symbol override `other' symbol, when both are seen as |
| 1104 | * members of class `origin'? It is assumed that _other is a member |
| 1105 | * of origin. |
| 1106 | * |
| 1107 | * It is assumed that both symbols have the same name. The static |
| 1108 | * modifier is ignored for this test. |
| 1109 | * |
| 1110 | * See JLS 8.4.6.1 (without transitivity) and 8.4.6.4 |
| 1111 | */ |
| 1112 | public boolean overrides(Symbol _other, TypeSymbol origin, Types types, boolean checkResult) { |
| 1113 | if (isConstructor() || _other.kind != MTH) return false; |
| 1114 | |
| 1115 | if (this == _other) return true; |
| 1116 | MethodSymbol other = (MethodSymbol)_other; |
| 1117 | |
| 1118 | // check for a direct implementation |
| 1119 | if (other.isOverridableIn((TypeSymbol)owner) && |
| 1120 | types.asSuper(owner.type, other.owner) != null) { |
| 1121 | Type mt = types.memberType(owner.type, this); |
| 1122 | Type ot = types.memberType(owner.type, other); |
| 1123 | if (types.isSubSignature(mt, ot)) { |
| 1124 | if (!checkResult) |
| 1125 | return true; |
| 1126 | if (types.returnTypeSubstitutable(mt, ot)) |
| 1127 | return true; |
| 1128 | } |
| 1129 | } |
| 1130 | |
| 1131 | // check for an inherited implementation |
| 1132 | if ((flags() & ABSTRACT) != 0 || |
| 1133 | (other.flags() & ABSTRACT) == 0 || |
| 1134 | !other.isOverridableIn(origin) || |
| 1135 | !this.isMemberOf(origin, types)) |
| 1136 | return false; |
| 1137 | |
| 1138 | // assert types.asSuper(origin.type, other.owner) != null; |
| 1139 | Type mt = types.memberType(origin.type, this); |
| 1140 | Type ot = types.memberType(origin.type, other); |
| 1141 | return |
| 1142 | types.isSubSignature(mt, ot) && |
| 1143 | (!checkResult || types.resultSubtype(mt, ot, Warner.noWarnings)); |
| 1144 | } |
| 1145 | |
| 1146 | private boolean isOverridableIn(TypeSymbol origin) { |
| 1147 | // JLS3 8.4.6.1 |
| 1148 | switch ((int)(flags_field & Flags.AccessFlags)) { |
| 1149 | case Flags.PRIVATE: |
| 1150 | return false; |
| 1151 | case Flags.PUBLIC: |
| 1152 | return true; |
| 1153 | case Flags.PROTECTED: |
| 1154 | return (origin.flags() & INTERFACE) == 0; |
| 1155 | case 0: |
| 1156 | // for package private: can only override in the same |
| 1157 | // package |
| 1158 | return |
| 1159 | this.packge() == origin.packge() && |
| 1160 | (origin.flags() & INTERFACE) == 0; |
| 1161 | default: |
| 1162 | return false; |
| 1163 | } |
| 1164 | } |
| 1165 | |
| 1166 | /** The implementation of this (abstract) symbol in class origin; |
| 1167 | * null if none exists. Synthetic methods are not considered |
| 1168 | * as possible implementations. |
| 1169 | */ |
| 1170 | public MethodSymbol implementation(TypeSymbol origin, Types types, boolean checkResult) { |
| 1171 | for (Type t = origin.type; t.tag == CLASS; t = types.supertype(t)) { |
| 1172 | TypeSymbol c = t.tsym; |
| 1173 | for (Scope.Entry e = c.members().lookup(name); |
| 1174 | e.scope != null; |
| 1175 | e = e.next()) { |
| 1176 | if (e.sym.kind == MTH) { |
| 1177 | MethodSymbol m = (MethodSymbol) e.sym; |
| 1178 | if (m.overrides(this, origin, types, checkResult) && |
| 1179 | (m.flags() & SYNTHETIC) == 0) |
| 1180 | return m; |
| 1181 | } |
| 1182 | } |
| 1183 | } |
| 1184 | // if origin is derived from a raw type, we might have missed |
| 1185 | // an implementation because we do not know enough about instantiations. |
| 1186 | // in this case continue with the supertype as origin. |
| 1187 | if (types.isDerivedRaw(origin.type)) |
| 1188 | return implementation(types.supertype(origin.type).tsym, types, checkResult); |
| 1189 | else |
| 1190 | return null; |
| 1191 | } |
| 1192 | |
| 1193 | public List<VarSymbol> params() { |
| 1194 | owner.complete(); |
| 1195 | if (params == null) { |
| 1196 | List<Name> names = savedParameterNames; |
| 1197 | savedParameterNames = null; |
| 1198 | if (names == null) { |
| 1199 | names = List.nil(); |
| 1200 | int i = 0; |
| 1201 | for (Type t : type.getParameterTypes()) |
| 1202 | names = names.prepend(name.table.fromString("arg" + i++)); |
| 1203 | names = names.reverse(); |
| 1204 | } |
| 1205 | ListBuffer<VarSymbol> buf = new ListBuffer<VarSymbol>(); |
| 1206 | for (Type t : type.getParameterTypes()) { |
| 1207 | buf.append(new VarSymbol(PARAMETER, names.head, t, this)); |
| 1208 | names = names.tail; |
| 1209 | } |
| 1210 | params = buf.toList(); |
| 1211 | } |
| 1212 | return params; |
| 1213 | } |
| 1214 | |
| 1215 | public Symbol asMemberOf(Type site, Types types) { |
| 1216 | return new MethodSymbol(flags_field, name, types.memberType(site, this), owner); |
| 1217 | } |
| 1218 | |
| 1219 | public ElementKind getKind() { |
| 1220 | if (name == name.table.init) |
| 1221 | return ElementKind.CONSTRUCTOR; |
| 1222 | else if (name == name.table.clinit) |
| 1223 | return ElementKind.STATIC_INIT; |
| 1224 | else |
| 1225 | return ElementKind.METHOD; |
| 1226 | } |
| 1227 | |
| 1228 | public Attribute getDefaultValue() { |
| 1229 | return defaultValue; |
| 1230 | } |
| 1231 | |
| 1232 | public List<VarSymbol> getParameters() { |
| 1233 | return params(); |
| 1234 | } |
| 1235 | |
| 1236 | public boolean isVarArgs() { |
| 1237 | return (flags() & VARARGS) != 0; |
| 1238 | } |
| 1239 | |
| 1240 | public <R, P> R accept(ElementVisitor<R, P> v, P p) { |
| 1241 | return v.visitExecutable(this, p); |
| 1242 | } |
| 1243 | |
| 1244 | public Type getReturnType() { |
| 1245 | return asType().getReturnType(); |
| 1246 | } |
| 1247 | |
| 1248 | public List<Type> getThrownTypes() { |
| 1249 | return asType().getThrownTypes(); |
| 1250 | } |
| 1251 | } |
| 1252 | |
| 1253 | /** A class for predefined operators. |
| 1254 | */ |
| 1255 | public static class OperatorSymbol extends MethodSymbol { |
| 1256 | |
| 1257 | public int opcode; |
| 1258 | |
| 1259 | public OperatorSymbol(Name name, Type type, int opcode, Symbol owner) { |
| 1260 | super(PUBLIC | STATIC, name, type, owner); |
| 1261 | this.opcode = opcode; |
| 1262 | } |
| 1263 | } |
| 1264 | |
| 1265 | /** Symbol completer interface. |
| 1266 | */ |
| 1267 | public static interface Completer { |
| 1268 | void complete(Symbol sym) throws CompletionFailure; |
| 1269 | } |
| 1270 | |
| 1271 | public static class CompletionFailure extends RuntimeException { |
| 1272 | private static final long serialVersionUID = 0; |
| 1273 | public Symbol sym; |
| 1274 | |
| 1275 | /** A localized string describing the failure. |
| 1276 | */ |
| 1277 | public String errmsg; |
| 1278 | |
| 1279 | public CompletionFailure(Symbol sym, String errmsg) { |
| 1280 | this.sym = sym; |
| 1281 | this.errmsg = errmsg; |
| 1282 | // this.printStackTrace();//DEBUG |
| 1283 | } |
| 1284 | |
| 1285 | public String getMessage() { |
| 1286 | return errmsg; |
| 1287 | } |
| 1288 | |
| 1289 | @Override |
| 1290 | public CompletionFailure initCause(Throwable cause) { |
| 1291 | super.initCause(cause); |
| 1292 | return this; |
| 1293 | } |
| 1294 | |
| 1295 | } |
| 1296 | } |