1 /* 2 * Copyright (c) 1999, 2017, 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 */ 25 26 package com.sun.tools.javac.code; 27 28 import java.lang.annotation.Annotation; 29 import java.lang.annotation.Inherited; 30 import java.util.Collections; 31 import java.util.EnumSet; 32 import java.util.Map; 33 import java.util.Set; 34 import java.util.concurrent.Callable; 35 36 import javax.lang.model.element.Element; 37 import javax.lang.model.element.ElementKind; 38 import javax.lang.model.element.ElementVisitor; 39 import javax.lang.model.element.ExecutableElement; 40 import javax.lang.model.element.Modifier; 41 import javax.lang.model.element.ModuleElement; 42 import javax.lang.model.element.NestingKind; 43 import javax.lang.model.element.PackageElement; 44 import javax.lang.model.element.TypeElement; 45 import javax.lang.model.element.TypeParameterElement; 46 import javax.lang.model.element.VariableElement; 47 import javax.tools.JavaFileManager; 48 import javax.tools.JavaFileObject; 49 50 import com.sun.tools.javac.code.ClassFinder.BadEnclosingMethodAttr; 51 import com.sun.tools.javac.code.Directive.RequiresFlag; 52 import com.sun.tools.javac.code.Kinds.Kind; 53 import com.sun.tools.javac.comp.Annotate.AnnotationTypeMetadata; 54 import com.sun.tools.javac.code.Scope.WriteableScope; 55 import com.sun.tools.javac.code.Type.*; 56 import com.sun.tools.javac.comp.Attr; 57 import com.sun.tools.javac.comp.AttrContext; 58 import com.sun.tools.javac.comp.Env; 59 import com.sun.tools.javac.jvm.*; 60 import com.sun.tools.javac.tree.JCTree.JCFieldAccess; 61 import com.sun.tools.javac.tree.JCTree.JCVariableDecl; 62 import com.sun.tools.javac.tree.JCTree.Tag; 63 import com.sun.tools.javac.util.*; 64 import com.sun.tools.javac.util.DefinedBy.Api; 65 import com.sun.tools.javac.util.Name; 66 67 import static com.sun.tools.javac.code.Flags.*; 68 import static com.sun.tools.javac.code.Kinds.*; 69 import static com.sun.tools.javac.code.Kinds.Kind.*; 70 import static com.sun.tools.javac.code.Scope.LookupKind.NON_RECURSIVE; 71 import static com.sun.tools.javac.code.Symbol.OperatorSymbol.AccessCode.FIRSTASGOP; 72 import static com.sun.tools.javac.code.TypeTag.CLASS; 73 import static com.sun.tools.javac.code.TypeTag.FORALL; 74 import static com.sun.tools.javac.code.TypeTag.TYPEVAR; 75 import static com.sun.tools.javac.jvm.ByteCodes.iadd; 76 import static com.sun.tools.javac.jvm.ByteCodes.ishll; 77 import static com.sun.tools.javac.jvm.ByteCodes.lushrl; 78 import static com.sun.tools.javac.jvm.ByteCodes.lxor; 79 import static com.sun.tools.javac.jvm.ByteCodes.string_add; 80 81 /** Root class for Java symbols. It contains subclasses 82 * for specific sorts of symbols, such as variables, methods and operators, 83 * types, packages. Each subclass is represented as a static inner class 84 * inside Symbol. 85 * 86 * <p><b>This is NOT part of any supported API. 87 * If you write code that depends on this, you do so at your own risk. 88 * This code and its internal interfaces are subject to change or 89 * deletion without notice.</b> 90 */ 91 public abstract class Symbol extends AnnoConstruct implements Element { 92 93 /** The kind of this symbol. 94 * @see Kinds 95 */ 96 public Kind kind; 97 98 /** The flags of this symbol. 99 */ 100 public long flags_field; 101 102 /** An accessor method for the flags of this symbol. 103 * Flags of class symbols should be accessed through the accessor 104 * method to make sure that the class symbol is loaded. 105 */ 106 public long flags() { return flags_field; } 107 108 /** The name of this symbol in Utf8 representation. 109 */ 110 public Name name; 111 112 /** The type of this symbol. 113 */ 114 public Type type; 115 116 /** The owner of this symbol. 117 */ 118 public Symbol owner; 119 120 /** The completer of this symbol. 121 * This should never equal null (NULL_COMPLETER should be used instead). 122 */ 123 public Completer completer; 124 125 /** A cache for the type erasure of this symbol. 126 */ 127 public Type erasure_field; 128 129 // <editor-fold defaultstate="collapsed" desc="annotations"> 130 131 /** The attributes of this symbol are contained in this 132 * SymbolMetadata. The SymbolMetadata instance is NOT immutable. 133 */ 134 protected SymbolMetadata metadata; 135 136 137 /** An accessor method for the attributes of this symbol. 138 * Attributes of class symbols should be accessed through the accessor 139 * method to make sure that the class symbol is loaded. 140 */ 141 public List<Attribute.Compound> getRawAttributes() { 142 return (metadata == null) 143 ? List.nil() 144 : metadata.getDeclarationAttributes(); 145 } 146 147 /** An accessor method for the type attributes of this symbol. 148 * Attributes of class symbols should be accessed through the accessor 149 * method to make sure that the class symbol is loaded. 150 */ 151 public List<Attribute.TypeCompound> getRawTypeAttributes() { 152 return (metadata == null) 153 ? List.nil() 154 : metadata.getTypeAttributes(); 155 } 156 157 /** Fetch a particular annotation from a symbol. */ 158 public Attribute.Compound attribute(Symbol anno) { 159 for (Attribute.Compound a : getRawAttributes()) { 160 if (a.type.tsym == anno) return a; 161 } 162 return null; 163 } 164 165 public boolean annotationsPendingCompletion() { 166 return metadata == null ? false : metadata.pendingCompletion(); 167 } 168 169 public void appendAttributes(List<Attribute.Compound> l) { 170 if (l.nonEmpty()) { 171 initedMetadata().append(l); 172 } 173 } 174 175 public void appendClassInitTypeAttributes(List<Attribute.TypeCompound> l) { 176 if (l.nonEmpty()) { 177 initedMetadata().appendClassInitTypeAttributes(l); 178 } 179 } 180 181 public void appendInitTypeAttributes(List<Attribute.TypeCompound> l) { 182 if (l.nonEmpty()) { 183 initedMetadata().appendInitTypeAttributes(l); 184 } 185 } 186 187 public void appendUniqueTypeAttributes(List<Attribute.TypeCompound> l) { 188 if (l.nonEmpty()) { 189 initedMetadata().appendUniqueTypes(l); 190 } 191 } 192 193 public List<Attribute.TypeCompound> getClassInitTypeAttributes() { 194 return (metadata == null) 195 ? List.nil() 196 : metadata.getClassInitTypeAttributes(); 197 } 198 199 public List<Attribute.TypeCompound> getInitTypeAttributes() { 200 return (metadata == null) 201 ? List.nil() 202 : metadata.getInitTypeAttributes(); 203 } 204 205 public void setInitTypeAttributes(List<Attribute.TypeCompound> l) { 206 initedMetadata().setInitTypeAttributes(l); 207 } 208 209 public void setClassInitTypeAttributes(List<Attribute.TypeCompound> l) { 210 initedMetadata().setClassInitTypeAttributes(l); 211 } 212 213 public List<Attribute.Compound> getDeclarationAttributes() { 214 return (metadata == null) 215 ? List.nil() 216 : metadata.getDeclarationAttributes(); 217 } 218 219 public boolean hasAnnotations() { 220 return (metadata != null && !metadata.isEmpty()); 221 } 222 223 public boolean hasTypeAnnotations() { 224 return (metadata != null && !metadata.isTypesEmpty()); 225 } 226 227 public boolean isCompleted() { 228 return completer.isTerminal(); 229 } 230 231 public void prependAttributes(List<Attribute.Compound> l) { 232 if (l.nonEmpty()) { 233 initedMetadata().prepend(l); 234 } 235 } 236 237 public void resetAnnotations() { 238 initedMetadata().reset(); 239 } 240 241 public void setAttributes(Symbol other) { 242 if (metadata != null || other.metadata != null) { 243 initedMetadata().setAttributes(other.metadata); 244 } 245 } 246 247 public void setDeclarationAttributes(List<Attribute.Compound> a) { 248 if (metadata != null || a.nonEmpty()) { 249 initedMetadata().setDeclarationAttributes(a); 250 } 251 } 252 253 public void setTypeAttributes(List<Attribute.TypeCompound> a) { 254 if (metadata != null || a.nonEmpty()) { 255 if (metadata == null) 256 metadata = new SymbolMetadata(this); 257 metadata.setTypeAttributes(a); 258 } 259 } 260 261 private SymbolMetadata initedMetadata() { 262 if (metadata == null) 263 metadata = new SymbolMetadata(this); 264 return metadata; 265 } 266 267 /** This method is intended for debugging only. */ 268 public SymbolMetadata getMetadata() { 269 return metadata; 270 } 271 272 // </editor-fold> 273 274 /** Construct a symbol with given kind, flags, name, type and owner. 275 */ 276 public Symbol(Kind kind, long flags, Name name, Type type, Symbol owner) { 277 this.kind = kind; 278 this.flags_field = flags; 279 this.type = type; 280 this.owner = owner; 281 this.completer = Completer.NULL_COMPLETER; 282 this.erasure_field = null; 283 this.name = name; 284 } 285 286 /** Clone this symbol with new owner. 287 * Legal only for fields and methods. 288 */ 289 public Symbol clone(Symbol newOwner) { 290 throw new AssertionError(); 291 } 292 293 public <R, P> R accept(Symbol.Visitor<R, P> v, P p) { 294 return v.visitSymbol(this, p); 295 } 296 297 /** The Java source which this symbol represents. 298 * A description of this symbol; overrides Object. 299 */ 300 public String toString() { 301 return name.toString(); 302 } 303 304 /** A Java source description of the location of this symbol; used for 305 * error reporting. 306 * 307 * @return null if the symbol is a package or a toplevel class defined in 308 * the default package; otherwise, the owner symbol is returned 309 */ 310 public Symbol location() { 311 if (owner.name == null || (owner.name.isEmpty() && 312 (owner.flags() & BLOCK) == 0 && 313 owner.kind != PCK && 314 owner.kind != TYP)) { 315 return null; 316 } 317 return owner; 318 } 319 320 public Symbol location(Type site, Types types) { 321 if (owner.name == null || owner.name.isEmpty()) { 322 return location(); 323 } 324 if (owner.type.hasTag(CLASS)) { 325 Type ownertype = types.asOuterSuper(site, owner); 326 if (ownertype != null) return ownertype.tsym; 327 } 328 return owner; 329 } 330 331 public Symbol baseSymbol() { 332 return this; 333 } 334 335 /** The symbol's erased type. 336 */ 337 public Type erasure(Types types) { 338 if (erasure_field == null) 339 erasure_field = types.erasure(type); 340 return erasure_field; 341 } 342 343 /** The external type of a symbol. This is the symbol's erased type 344 * except for constructors of inner classes which get the enclosing 345 * instance class added as first argument. 346 */ 347 public Type externalType(Types types) { 348 Type t = erasure(types); 349 if (name == name.table.names.init && owner.hasOuterInstance()) { 350 Type outerThisType = types.erasure(owner.type.getEnclosingType()); 351 return new MethodType(t.getParameterTypes().prepend(outerThisType), 352 t.getReturnType(), 353 t.getThrownTypes(), 354 t.tsym); 355 } else { 356 return t; 357 } 358 } 359 360 public boolean isDeprecated() { 361 return (flags_field & DEPRECATED) != 0; 362 } 363 364 public boolean hasDeprecatedAnnotation() { 365 return (flags_field & DEPRECATED_ANNOTATION) != 0; 366 } 367 368 public boolean isDeprecatedForRemoval() { 369 return (flags_field & DEPRECATED_REMOVAL) != 0; 370 } 371 372 public boolean isDeprecatableViaAnnotation() { 373 switch (getKind()) { 374 case LOCAL_VARIABLE: 375 case PACKAGE: 376 case PARAMETER: 377 case RESOURCE_VARIABLE: 378 case EXCEPTION_PARAMETER: 379 return false; 380 default: 381 return true; 382 } 383 } 384 385 public boolean isStatic() { 386 return 387 (flags() & STATIC) != 0 || 388 (owner.flags() & INTERFACE) != 0 && kind != MTH && 389 name != name.table.names._this; 390 } 391 392 public boolean isInterface() { 393 return (flags() & INTERFACE) != 0; 394 } 395 396 public boolean isPrivate() { 397 return (flags_field & Flags.AccessFlags) == PRIVATE; 398 } 399 400 public boolean isEnum() { 401 return (flags() & ENUM) != 0; 402 } 403 404 /** Is this symbol declared (directly or indirectly) local 405 * to a method or variable initializer? 406 * Also includes fields of inner classes which are in 407 * turn local to a method or variable initializer. 408 */ 409 public boolean isLocal() { 410 return 411 (owner.kind.matches(KindSelector.VAL_MTH) || 412 (owner.kind == TYP && owner.isLocal())); 413 } 414 415 /** Has this symbol an empty name? This includes anonymous 416 * inner classes. 417 */ 418 public boolean isAnonymous() { 419 return name.isEmpty(); 420 } 421 422 /** Is this symbol a constructor? 423 */ 424 public boolean isConstructor() { 425 return name == name.table.names.init; 426 } 427 428 /** The fully qualified name of this symbol. 429 * This is the same as the symbol's name except for class symbols, 430 * which are handled separately. 431 */ 432 public Name getQualifiedName() { 433 return name; 434 } 435 436 /** The fully qualified name of this symbol after converting to flat 437 * representation. This is the same as the symbol's name except for 438 * class symbols, which are handled separately. 439 */ 440 public Name flatName() { 441 return getQualifiedName(); 442 } 443 444 /** If this is a class or package, its members, otherwise null. 445 */ 446 public WriteableScope members() { 447 return null; 448 } 449 450 /** A class is an inner class if it it has an enclosing instance class. 451 */ 452 public boolean isInner() { 453 return kind == TYP && type.getEnclosingType().hasTag(CLASS); 454 } 455 456 /** An inner class has an outer instance if it is not an interface 457 * it has an enclosing instance class which might be referenced from the class. 458 * Nested classes can see instance members of their enclosing class. 459 * Their constructors carry an additional this$n parameter, inserted 460 * implicitly by the compiler. 461 * 462 * @see #isInner 463 */ 464 public boolean hasOuterInstance() { 465 return 466 type.getEnclosingType().hasTag(CLASS) && (flags() & (INTERFACE | NOOUTERTHIS)) == 0; 467 } 468 469 /** The closest enclosing class of this symbol's declaration. 470 * Warning: this (misnamed) method returns the receiver itself 471 * when the receiver is a class (as opposed to its enclosing 472 * class as one may be misled to believe.) 473 */ 474 public ClassSymbol enclClass() { 475 Symbol c = this; 476 while (c != null && 477 (!c.kind.matches(KindSelector.TYP) || !c.type.hasTag(CLASS))) { 478 c = c.owner; 479 } 480 return (ClassSymbol)c; 481 } 482 483 /** The outermost class which indirectly owns this symbol. 484 */ 485 public ClassSymbol outermostClass() { 486 Symbol sym = this; 487 Symbol prev = null; 488 while (sym.kind != PCK) { 489 prev = sym; 490 sym = sym.owner; 491 } 492 return (ClassSymbol) prev; 493 } 494 495 /** The package which indirectly owns this symbol. 496 */ 497 public PackageSymbol packge() { 498 Symbol sym = this; 499 while (sym.kind != PCK) { 500 sym = sym.owner; 501 } 502 return (PackageSymbol) sym; 503 } 504 505 /** Is this symbol a subclass of `base'? Only defined for ClassSymbols. 506 */ 507 public boolean isSubClass(Symbol base, Types types) { 508 throw new AssertionError("isSubClass " + this); 509 } 510 511 /** Fully check membership: hierarchy, protection, and hiding. 512 * Does not exclude methods not inherited due to overriding. 513 */ 514 public boolean isMemberOf(TypeSymbol clazz, Types types) { 515 return 516 owner == clazz || 517 clazz.isSubClass(owner, types) && 518 isInheritedIn(clazz, types) && 519 !hiddenIn((ClassSymbol)clazz, types); 520 } 521 522 /** Is this symbol the same as or enclosed by the given class? */ 523 public boolean isEnclosedBy(ClassSymbol clazz) { 524 for (Symbol sym = this; sym.kind != PCK; sym = sym.owner) 525 if (sym == clazz) return true; 526 return false; 527 } 528 529 private boolean hiddenIn(ClassSymbol clazz, Types types) { 530 Symbol sym = hiddenInInternal(clazz, types); 531 Assert.check(sym != null, "the result of hiddenInInternal() can't be null"); 532 /* If we find the current symbol then there is no symbol hiding it 533 */ 534 return sym != this; 535 } 536 537 /** This method looks in the supertypes graph that has the current class as the 538 * initial node, till it finds the current symbol or another symbol that hides it. 539 * If the current class has more than one supertype (extends one class and 540 * implements one or more interfaces) then null can be returned, meaning that 541 * a wrong path in the supertypes graph was selected. Null can only be returned 542 * as a temporary value, as a result of the recursive call. 543 */ 544 private Symbol hiddenInInternal(ClassSymbol currentClass, Types types) { 545 if (currentClass == owner) { 546 return this; 547 } 548 for (Symbol sym : currentClass.members().getSymbolsByName(name)) { 549 if (sym.kind == kind && 550 (kind != MTH || 551 (sym.flags() & STATIC) != 0 && 552 types.isSubSignature(sym.type, type))) { 553 return sym; 554 } 555 } 556 Symbol hiddenSym = null; 557 for (Type st : types.interfaces(currentClass.type) 558 .prepend(types.supertype(currentClass.type))) { 559 if (st != null && (st.hasTag(CLASS))) { 560 Symbol sym = hiddenInInternal((ClassSymbol)st.tsym, types); 561 if (sym == this) { 562 return this; 563 } else if (sym != null) { 564 hiddenSym = sym; 565 } 566 } 567 } 568 return hiddenSym; 569 } 570 571 /** Is this symbol inherited into a given class? 572 * PRE: If symbol's owner is a interface, 573 * it is already assumed that the interface is a superinterface 574 * of given class. 575 * @param clazz The class for which we want to establish membership. 576 * This must be a subclass of the member's owner. 577 */ 578 public boolean isInheritedIn(Symbol clazz, Types types) { 579 switch ((int)(flags_field & Flags.AccessFlags)) { 580 default: // error recovery 581 case PUBLIC: 582 return true; 583 case PRIVATE: 584 return this.owner == clazz; 585 case PROTECTED: 586 // we model interfaces as extending Object 587 return (clazz.flags() & INTERFACE) == 0; 588 case 0: 589 PackageSymbol thisPackage = this.packge(); 590 for (Symbol sup = clazz; 591 sup != null && sup != this.owner; 592 sup = types.supertype(sup.type).tsym) { 593 while (sup.type.hasTag(TYPEVAR)) 594 sup = sup.type.getUpperBound().tsym; 595 if (sup.type.isErroneous()) 596 return true; // error recovery 597 if ((sup.flags() & COMPOUND) != 0) 598 continue; 599 if (sup.packge() != thisPackage) 600 return false; 601 } 602 return (clazz.flags() & INTERFACE) == 0; 603 } 604 } 605 606 /** The (variable or method) symbol seen as a member of given 607 * class type`site' (this might change the symbol's type). 608 * This is used exclusively for producing diagnostics. 609 */ 610 public Symbol asMemberOf(Type site, Types types) { 611 throw new AssertionError(); 612 } 613 614 /** Does this method symbol override `other' symbol, when both are seen as 615 * members of class `origin'? It is assumed that _other is a member 616 * of origin. 617 * 618 * It is assumed that both symbols have the same name. The static 619 * modifier is ignored for this test. 620 * 621 * See JLS 8.4.6.1 (without transitivity) and 8.4.6.4 622 */ 623 public boolean overrides(Symbol _other, TypeSymbol origin, Types types, boolean checkResult) { 624 return false; 625 } 626 627 /** Complete the elaboration of this symbol's definition. 628 */ 629 public void complete() throws CompletionFailure { 630 if (completer != Completer.NULL_COMPLETER) { 631 Completer c = completer; 632 completer = Completer.NULL_COMPLETER; 633 c.complete(this); 634 } 635 } 636 637 /** True if the symbol represents an entity that exists. 638 */ 639 public boolean exists() { 640 return true; 641 } 642 643 @DefinedBy(Api.LANGUAGE_MODEL) 644 public Type asType() { 645 return type; 646 } 647 648 @DefinedBy(Api.LANGUAGE_MODEL) 649 public Symbol getEnclosingElement() { 650 return owner; 651 } 652 653 @DefinedBy(Api.LANGUAGE_MODEL) 654 public ElementKind getKind() { 655 return ElementKind.OTHER; // most unkind 656 } 657 658 @DefinedBy(Api.LANGUAGE_MODEL) 659 public Set<Modifier> getModifiers() { 660 return Flags.asModifierSet(flags()); 661 } 662 663 @DefinedBy(Api.LANGUAGE_MODEL) 664 public Name getSimpleName() { 665 return name; 666 } 667 668 /** 669 * This is the implementation for {@code 670 * javax.lang.model.element.Element.getAnnotationMirrors()}. 671 */ 672 @Override @DefinedBy(Api.LANGUAGE_MODEL) 673 public List<Attribute.Compound> getAnnotationMirrors() { 674 return getRawAttributes(); 675 } 676 677 678 // TODO: getEnclosedElements should return a javac List, fix in FilteredMemberList 679 @DefinedBy(Api.LANGUAGE_MODEL) 680 public java.util.List<Symbol> getEnclosedElements() { 681 return List.nil(); 682 } 683 684 public List<TypeVariableSymbol> getTypeParameters() { 685 ListBuffer<TypeVariableSymbol> l = new ListBuffer<>(); 686 for (Type t : type.getTypeArguments()) { 687 Assert.check(t.tsym.getKind() == ElementKind.TYPE_PARAMETER); 688 l.append((TypeVariableSymbol)t.tsym); 689 } 690 return l.toList(); 691 } 692 693 public static class DelegatedSymbol<T extends Symbol> extends Symbol { 694 protected T other; 695 public DelegatedSymbol(T other) { 696 super(other.kind, other.flags_field, other.name, other.type, other.owner); 697 this.other = other; 698 } 699 public String toString() { return other.toString(); } 700 public Symbol location() { return other.location(); } 701 public Symbol location(Type site, Types types) { return other.location(site, types); } 702 public Symbol baseSymbol() { return other; } 703 public Type erasure(Types types) { return other.erasure(types); } 704 public Type externalType(Types types) { return other.externalType(types); } 705 public boolean isLocal() { return other.isLocal(); } 706 public boolean isConstructor() { return other.isConstructor(); } 707 public Name getQualifiedName() { return other.getQualifiedName(); } 708 public Name flatName() { return other.flatName(); } 709 public WriteableScope members() { return other.members(); } 710 public boolean isInner() { return other.isInner(); } 711 public boolean hasOuterInstance() { return other.hasOuterInstance(); } 712 public ClassSymbol enclClass() { return other.enclClass(); } 713 public ClassSymbol outermostClass() { return other.outermostClass(); } 714 public PackageSymbol packge() { return other.packge(); } 715 public boolean isSubClass(Symbol base, Types types) { return other.isSubClass(base, types); } 716 public boolean isMemberOf(TypeSymbol clazz, Types types) { return other.isMemberOf(clazz, types); } 717 public boolean isEnclosedBy(ClassSymbol clazz) { return other.isEnclosedBy(clazz); } 718 public boolean isInheritedIn(Symbol clazz, Types types) { return other.isInheritedIn(clazz, types); } 719 public Symbol asMemberOf(Type site, Types types) { return other.asMemberOf(site, types); } 720 public void complete() throws CompletionFailure { other.complete(); } 721 722 @DefinedBy(Api.LANGUAGE_MODEL) 723 public <R, P> R accept(ElementVisitor<R, P> v, P p) { 724 return other.accept(v, p); 725 } 726 727 public <R, P> R accept(Symbol.Visitor<R, P> v, P p) { 728 return v.visitSymbol(other, p); 729 } 730 731 public T getUnderlyingSymbol() { 732 return other; 733 } 734 } 735 736 /** A base class for Symbols representing types. 737 */ 738 public static abstract class TypeSymbol extends Symbol { 739 public TypeSymbol(Kind kind, long flags, Name name, Type type, Symbol owner) { 740 super(kind, flags, name, type, owner); 741 } 742 /** form a fully qualified name from a name and an owner 743 */ 744 static public Name formFullName(Name name, Symbol owner) { 745 if (owner == null) return name; 746 if ((owner.kind != ERR) && 747 (owner.kind.matches(KindSelector.VAL_MTH) || 748 (owner.kind == TYP && owner.type.hasTag(TYPEVAR)) 749 )) return name; 750 Name prefix = owner.getQualifiedName(); 751 if (prefix == null || prefix == prefix.table.names.empty) 752 return name; 753 else return prefix.append('.', name); 754 } 755 756 /** form a fully qualified name from a name and an owner, after 757 * converting to flat representation 758 */ 759 static public Name formFlatName(Name name, Symbol owner) { 760 if (owner == null || owner.kind.matches(KindSelector.VAL_MTH) || 761 (owner.kind == TYP && owner.type.hasTag(TYPEVAR)) 762 ) return name; 763 char sep = owner.kind == TYP ? '$' : '.'; 764 Name prefix = owner.flatName(); 765 if (prefix == null || prefix == prefix.table.names.empty) 766 return name; 767 else return prefix.append(sep, name); 768 } 769 770 /** 771 * A partial ordering between type symbols that refines the 772 * class inheritance graph. 773 * 774 * Type variables always precede other kinds of symbols. 775 */ 776 public final boolean precedes(TypeSymbol that, Types types) { 777 if (this == that) 778 return false; 779 if (type.hasTag(that.type.getTag())) { 780 if (type.hasTag(CLASS)) { 781 return 782 types.rank(that.type) < types.rank(this.type) || 783 types.rank(that.type) == types.rank(this.type) && 784 that.getQualifiedName().compareTo(this.getQualifiedName()) < 0; 785 } else if (type.hasTag(TYPEVAR)) { 786 return types.isSubtype(this.type, that.type); 787 } 788 } 789 return type.hasTag(TYPEVAR); 790 } 791 792 @Override @DefinedBy(Api.LANGUAGE_MODEL) 793 public java.util.List<Symbol> getEnclosedElements() { 794 List<Symbol> list = List.nil(); 795 if (kind == TYP && type.hasTag(TYPEVAR)) { 796 return list; 797 } 798 for (Symbol sym : members().getSymbols(NON_RECURSIVE)) { 799 try { 800 if (sym != null && (sym.flags() & SYNTHETIC) == 0 && sym.owner == this) { 801 list = list.prepend(sym); 802 } 803 } catch (BadEnclosingMethodAttr badEnclosingMethod) { 804 // ignore the exception 805 } 806 } 807 return list; 808 } 809 810 public AnnotationTypeMetadata getAnnotationTypeMetadata() { 811 Assert.error("Only on ClassSymbol"); 812 return null; //unreachable 813 } 814 815 public boolean isAnnotationType() { return false; } 816 817 @Override 818 public <R, P> R accept(Symbol.Visitor<R, P> v, P p) { 819 return v.visitTypeSymbol(this, p); 820 } 821 } 822 823 /** 824 * Type variables are represented by instances of this class. 825 */ 826 public static class TypeVariableSymbol 827 extends TypeSymbol implements TypeParameterElement { 828 829 public TypeVariableSymbol(long flags, Name name, Type type, Symbol owner) { 830 super(TYP, flags, name, type, owner); 831 } 832 833 @DefinedBy(Api.LANGUAGE_MODEL) 834 public ElementKind getKind() { 835 return ElementKind.TYPE_PARAMETER; 836 } 837 838 @Override @DefinedBy(Api.LANGUAGE_MODEL) 839 public Symbol getGenericElement() { 840 return owner; 841 } 842 843 @DefinedBy(Api.LANGUAGE_MODEL) 844 public List<Type> getBounds() { 845 TypeVar t = (TypeVar)type; 846 Type bound = t.getUpperBound(); 847 if (!bound.isCompound()) 848 return List.of(bound); 849 ClassType ct = (ClassType)bound; 850 if (!ct.tsym.erasure_field.isInterface()) { 851 return ct.interfaces_field.prepend(ct.supertype_field); 852 } else { 853 // No superclass was given in bounds. 854 // In this case, supertype is Object, erasure is first interface. 855 return ct.interfaces_field; 856 } 857 } 858 859 @Override @DefinedBy(Api.LANGUAGE_MODEL) 860 public List<Attribute.Compound> getAnnotationMirrors() { 861 // Declaration annotations on type variables are stored in type attributes 862 // on the owner of the TypeVariableSymbol 863 List<Attribute.TypeCompound> candidates = owner.getRawTypeAttributes(); 864 int index = owner.getTypeParameters().indexOf(this); 865 List<Attribute.Compound> res = List.nil(); 866 for (Attribute.TypeCompound a : candidates) { 867 if (isCurrentSymbolsAnnotation(a, index)) 868 res = res.prepend(a); 869 } 870 871 return res.reverse(); 872 } 873 874 // Helper to getAnnotation[s] 875 @Override 876 public <A extends Annotation> Attribute.Compound getAttribute(Class<A> annoType) { 877 String name = annoType.getName(); 878 879 // Declaration annotations on type variables are stored in type attributes 880 // on the owner of the TypeVariableSymbol 881 List<Attribute.TypeCompound> candidates = owner.getRawTypeAttributes(); 882 int index = owner.getTypeParameters().indexOf(this); 883 for (Attribute.TypeCompound anno : candidates) 884 if (isCurrentSymbolsAnnotation(anno, index) && 885 name.contentEquals(anno.type.tsym.flatName())) 886 return anno; 887 888 return null; 889 } 890 //where: 891 boolean isCurrentSymbolsAnnotation(Attribute.TypeCompound anno, int index) { 892 return (anno.position.type == TargetType.CLASS_TYPE_PARAMETER || 893 anno.position.type == TargetType.METHOD_TYPE_PARAMETER) && 894 anno.position.parameter_index == index; 895 } 896 897 898 @Override @DefinedBy(Api.LANGUAGE_MODEL) 899 public <R, P> R accept(ElementVisitor<R, P> v, P p) { 900 return v.visitTypeParameter(this, p); 901 } 902 } 903 /** A class for module symbols. 904 */ 905 public static class ModuleSymbol extends TypeSymbol 906 implements ModuleElement { 907 908 public Name version; 909 public JavaFileManager.Location sourceLocation; 910 public JavaFileManager.Location classLocation; 911 public JavaFileManager.Location patchLocation; 912 public JavaFileManager.Location patchOutputLocation; 913 914 /** All directives, in natural order. */ 915 public List<com.sun.tools.javac.code.Directive> directives; 916 public List<com.sun.tools.javac.code.Directive.RequiresDirective> requires; 917 public List<com.sun.tools.javac.code.Directive.ExportsDirective> exports; 918 public List<com.sun.tools.javac.code.Directive.OpensDirective> opens; 919 public List<com.sun.tools.javac.code.Directive.ProvidesDirective> provides; 920 public List<com.sun.tools.javac.code.Directive.UsesDirective> uses; 921 922 public ClassSymbol module_info; 923 924 public PackageSymbol unnamedPackage; 925 public Map<Name, PackageSymbol> visiblePackages; 926 public Set<ModuleSymbol> readModules; 927 public List<Symbol> enclosedPackages = List.nil(); 928 929 public Completer usesProvidesCompleter = Completer.NULL_COMPLETER; 930 public final Set<ModuleFlags> flags = EnumSet.noneOf(ModuleFlags.class); 931 public final Set<ModuleResolutionFlags> resolutionFlags = EnumSet.noneOf(ModuleResolutionFlags.class); 932 933 /** 934 * Create a ModuleSymbol with an associated module-info ClassSymbol. 935 */ 936 public static ModuleSymbol create(Name name, Name module_info) { 937 ModuleSymbol msym = new ModuleSymbol(name, null); 938 ClassSymbol info = new ClassSymbol(Flags.MODULE, module_info, msym); 939 info.fullname = formFullName(module_info, msym); 940 info.flatname = info.fullname; 941 info.members_field = WriteableScope.create(info); 942 msym.module_info = info; 943 return msym; 944 } 945 946 public ModuleSymbol(Name name, Symbol owner) { 947 super(MDL, 0, name, null, owner); 948 Assert.checkNonNull(name); 949 this.type = new ModuleType(this); 950 } 951 952 @Override @DefinedBy(Api.LANGUAGE_MODEL) 953 public boolean isOpen() { 954 return flags.contains(ModuleFlags.OPEN); 955 } 956 957 @Override @DefinedBy(Api.LANGUAGE_MODEL) 958 public boolean isUnnamed() { 959 return name.isEmpty() && owner == null; 960 } 961 962 @Override 963 public boolean isDeprecated() { 964 return hasDeprecatedAnnotation(); 965 } 966 967 public boolean isNoModule() { 968 return false; 969 } 970 971 @Override @DefinedBy(Api.LANGUAGE_MODEL) 972 public ElementKind getKind() { 973 return ElementKind.MODULE; 974 } 975 976 @Override @DefinedBy(Api.LANGUAGE_MODEL) 977 public java.util.List<Directive> getDirectives() { 978 complete(); 979 completeUsesProvides(); 980 return Collections.unmodifiableList(directives); 981 } 982 983 public void completeUsesProvides() { 984 if (usesProvidesCompleter != Completer.NULL_COMPLETER) { 985 Completer c = usesProvidesCompleter; 986 usesProvidesCompleter = Completer.NULL_COMPLETER; 987 c.complete(this); 988 } 989 } 990 991 @Override 992 public ClassSymbol outermostClass() { 993 return null; 994 } 995 996 @Override 997 public String toString() { 998 // TODO: the following strings should be localized 999 // Do this with custom anon subtypes in Symtab 1000 String n = (name == null) ? "<unknown>" 1001 : (name.isEmpty()) ? "<unnamed>" 1002 : String.valueOf(name); 1003 return n; 1004 } 1005 1006 @Override @DefinedBy(Api.LANGUAGE_MODEL) 1007 public <R, P> R accept(ElementVisitor<R, P> v, P p) { 1008 return v.visitModule(this, p); 1009 } 1010 1011 @Override @DefinedBy(Api.LANGUAGE_MODEL) 1012 public List<Symbol> getEnclosedElements() { 1013 List<Symbol> list = List.nil(); 1014 for (Symbol sym : enclosedPackages) { 1015 if (sym.members().anyMatch(m -> m.kind == TYP)) 1016 list = list.prepend(sym); 1017 } 1018 return list; 1019 } 1020 1021 public void reset() { 1022 this.directives = null; 1023 this.requires = null; 1024 this.exports = null; 1025 this.provides = null; 1026 this.uses = null; 1027 this.visiblePackages = null; 1028 } 1029 1030 } 1031 1032 public enum ModuleFlags { 1033 OPEN(0x0020), 1034 SYNTHETIC(0x1000), 1035 MANDATED(0x8000); 1036 1037 public static int value(Set<ModuleFlags> s) { 1038 int v = 0; 1039 for (ModuleFlags f: s) 1040 v |= f.value; 1041 return v; 1042 } 1043 1044 private ModuleFlags(int value) { 1045 this.value = value; 1046 } 1047 1048 public final int value; 1049 } 1050 1051 public enum ModuleResolutionFlags { 1052 DO_NOT_RESOLVE_BY_DEFAULT(0x0001), 1053 WARN_DEPRECATED(0x0002), 1054 WARN_DEPRECATED_REMOVAL(0x0004), 1055 WARN_INCUBATING(0x0008); 1056 1057 public static int value(Set<ModuleResolutionFlags> s) { 1058 int v = 0; 1059 for (ModuleResolutionFlags f: s) 1060 v |= f.value; 1061 return v; 1062 } 1063 1064 private ModuleResolutionFlags(int value) { 1065 this.value = value; 1066 } 1067 1068 public final int value; 1069 } 1070 1071 /** A class for package symbols 1072 */ 1073 public static class PackageSymbol extends TypeSymbol 1074 implements PackageElement { 1075 1076 public WriteableScope members_field; 1077 public Name fullname; 1078 public ClassSymbol package_info; // see bug 6443073 1079 public ModuleSymbol modle; 1080 // the file containing the documentation comments for the package 1081 public JavaFileObject sourcefile; 1082 1083 public PackageSymbol(Name name, Type type, Symbol owner) { 1084 super(PCK, 0, name, type, owner); 1085 this.members_field = null; 1086 this.fullname = formFullName(name, owner); 1087 } 1088 1089 public PackageSymbol(Name name, Symbol owner) { 1090 this(name, null, owner); 1091 this.type = new PackageType(this); 1092 } 1093 1094 public String toString() { 1095 return fullname.toString(); 1096 } 1097 1098 @DefinedBy(Api.LANGUAGE_MODEL) 1099 public Name getQualifiedName() { 1100 return fullname; 1101 } 1102 1103 @DefinedBy(Api.LANGUAGE_MODEL) 1104 public boolean isUnnamed() { 1105 return name.isEmpty() && owner != null; 1106 } 1107 1108 public WriteableScope members() { 1109 complete(); 1110 return members_field; 1111 } 1112 1113 public long flags() { 1114 complete(); 1115 return flags_field; 1116 } 1117 1118 @Override 1119 public List<Attribute.Compound> getRawAttributes() { 1120 complete(); 1121 if (package_info != null) { 1122 package_info.complete(); 1123 mergeAttributes(); 1124 } 1125 return super.getRawAttributes(); 1126 } 1127 1128 private void mergeAttributes() { 1129 if (metadata == null && 1130 package_info.metadata != null) { 1131 metadata = new SymbolMetadata(this); 1132 metadata.setAttributes(package_info.metadata); 1133 } 1134 } 1135 1136 /** A package "exists" if a type or package that exists has 1137 * been seen within it. 1138 */ 1139 public boolean exists() { 1140 return (flags_field & EXISTS) != 0; 1141 } 1142 1143 @DefinedBy(Api.LANGUAGE_MODEL) 1144 public ElementKind getKind() { 1145 return ElementKind.PACKAGE; 1146 } 1147 1148 @DefinedBy(Api.LANGUAGE_MODEL) 1149 public Symbol getEnclosingElement() { 1150 return modle != null && !modle.isNoModule() ? modle : null; 1151 } 1152 1153 @DefinedBy(Api.LANGUAGE_MODEL) 1154 public <R, P> R accept(ElementVisitor<R, P> v, P p) { 1155 return v.visitPackage(this, p); 1156 } 1157 1158 public <R, P> R accept(Symbol.Visitor<R, P> v, P p) { 1159 return v.visitPackageSymbol(this, p); 1160 } 1161 1162 /**Resets the Symbol into the state good for next round of annotation processing.*/ 1163 public void reset() { 1164 metadata = null; 1165 } 1166 1167 } 1168 1169 /** A class for class symbols 1170 */ 1171 public static class ClassSymbol extends TypeSymbol implements TypeElement { 1172 1173 /** a scope for all class members; variables, methods and inner classes 1174 * type parameters are not part of this scope 1175 */ 1176 public WriteableScope members_field; 1177 1178 /** the fully qualified name of the class, i.e. pck.outer.inner. 1179 * null for anonymous classes 1180 */ 1181 public Name fullname; 1182 1183 /** the fully qualified name of the class after converting to flat 1184 * representation, i.e. pck.outer$inner, 1185 * set externally for local and anonymous classes 1186 */ 1187 public Name flatname; 1188 1189 /** the sourcefile where the class came from 1190 */ 1191 public JavaFileObject sourcefile; 1192 1193 /** the classfile from where to load this class 1194 * this will have extension .class or .java 1195 */ 1196 public JavaFileObject classfile; 1197 1198 /** the list of translated local classes (used for generating 1199 * InnerClasses attribute) 1200 */ 1201 public List<ClassSymbol> trans_local; 1202 1203 /** the constant pool of the class 1204 */ 1205 public Pool pool; 1206 1207 /** the annotation metadata attached to this class */ 1208 private AnnotationTypeMetadata annotationTypeMetadata; 1209 1210 public ClassSymbol(long flags, Name name, Type type, Symbol owner) { 1211 super(TYP, flags, name, type, owner); 1212 this.members_field = null; 1213 this.fullname = formFullName(name, owner); 1214 this.flatname = formFlatName(name, owner); 1215 this.sourcefile = null; 1216 this.classfile = null; 1217 this.pool = null; 1218 this.annotationTypeMetadata = AnnotationTypeMetadata.notAnAnnotationType(); 1219 } 1220 1221 public ClassSymbol(long flags, Name name, Symbol owner) { 1222 this( 1223 flags, 1224 name, 1225 new ClassType(Type.noType, null, null), 1226 owner); 1227 this.type.tsym = this; 1228 } 1229 1230 /** The Java source which this symbol represents. 1231 */ 1232 public String toString() { 1233 return className(); 1234 } 1235 1236 public long flags() { 1237 complete(); 1238 return flags_field; 1239 } 1240 1241 public WriteableScope members() { 1242 complete(); 1243 return members_field; 1244 } 1245 1246 @Override 1247 public List<Attribute.Compound> getRawAttributes() { 1248 complete(); 1249 return super.getRawAttributes(); 1250 } 1251 1252 @Override 1253 public List<Attribute.TypeCompound> getRawTypeAttributes() { 1254 complete(); 1255 return super.getRawTypeAttributes(); 1256 } 1257 1258 public Type erasure(Types types) { 1259 if (erasure_field == null) 1260 erasure_field = new ClassType(types.erasure(type.getEnclosingType()), 1261 List.nil(), this, 1262 type.getMetadata()); 1263 return erasure_field; 1264 } 1265 1266 public String className() { 1267 if (name.isEmpty()) 1268 return 1269 Log.getLocalizedString("anonymous.class", flatname); 1270 else 1271 return fullname.toString(); 1272 } 1273 1274 @DefinedBy(Api.LANGUAGE_MODEL) 1275 public Name getQualifiedName() { 1276 return fullname; 1277 } 1278 1279 public Name flatName() { 1280 return flatname; 1281 } 1282 1283 public boolean isSubClass(Symbol base, Types types) { 1284 if (this == base) { 1285 return true; 1286 } else if ((base.flags() & INTERFACE) != 0) { 1287 for (Type t = type; t.hasTag(CLASS); t = types.supertype(t)) 1288 for (List<Type> is = types.interfaces(t); 1289 is.nonEmpty(); 1290 is = is.tail) 1291 if (is.head.tsym.isSubClass(base, types)) return true; 1292 } else { 1293 for (Type t = type; t.hasTag(CLASS); t = types.supertype(t)) 1294 if (t.tsym == base) return true; 1295 } 1296 return false; 1297 } 1298 1299 /** Complete the elaboration of this symbol's definition. 1300 */ 1301 public void complete() throws CompletionFailure { 1302 try { 1303 super.complete(); 1304 } catch (CompletionFailure ex) { 1305 // quiet error recovery 1306 flags_field |= (PUBLIC|STATIC); 1307 this.type = new ErrorType(this, Type.noType); 1308 throw ex; 1309 } 1310 } 1311 1312 @DefinedBy(Api.LANGUAGE_MODEL) 1313 public List<Type> getInterfaces() { 1314 complete(); 1315 if (type instanceof ClassType) { 1316 ClassType t = (ClassType)type; 1317 if (t.interfaces_field == null) // FIXME: shouldn't be null 1318 t.interfaces_field = List.nil(); 1319 if (t.all_interfaces_field != null) 1320 return Type.getModelTypes(t.all_interfaces_field); 1321 return t.interfaces_field; 1322 } else { 1323 return List.nil(); 1324 } 1325 } 1326 1327 @DefinedBy(Api.LANGUAGE_MODEL) 1328 public Type getSuperclass() { 1329 complete(); 1330 if (type instanceof ClassType) { 1331 ClassType t = (ClassType)type; 1332 if (t.supertype_field == null) // FIXME: shouldn't be null 1333 t.supertype_field = Type.noType; 1334 // An interface has no superclass; its supertype is Object. 1335 return t.isInterface() 1336 ? Type.noType 1337 : t.supertype_field.getModelType(); 1338 } else { 1339 return Type.noType; 1340 } 1341 } 1342 1343 /** 1344 * Returns the next class to search for inherited annotations or {@code null} 1345 * if the next class can't be found. 1346 */ 1347 private ClassSymbol getSuperClassToSearchForAnnotations() { 1348 1349 Type sup = getSuperclass(); 1350 1351 if (!sup.hasTag(CLASS) || sup.isErroneous()) 1352 return null; 1353 1354 return (ClassSymbol) sup.tsym; 1355 } 1356 1357 1358 @Override 1359 protected <A extends Annotation> A[] getInheritedAnnotations(Class<A> annoType) { 1360 1361 ClassSymbol sup = getSuperClassToSearchForAnnotations(); 1362 1363 return sup == null ? super.getInheritedAnnotations(annoType) 1364 : sup.getAnnotationsByType(annoType); 1365 } 1366 1367 1368 @DefinedBy(Api.LANGUAGE_MODEL) 1369 public ElementKind getKind() { 1370 long flags = flags(); 1371 if ((flags & ANNOTATION) != 0) 1372 return ElementKind.ANNOTATION_TYPE; 1373 else if ((flags & INTERFACE) != 0) 1374 return ElementKind.INTERFACE; 1375 else if ((flags & ENUM) != 0) 1376 return ElementKind.ENUM; 1377 else 1378 return ElementKind.CLASS; 1379 } 1380 1381 @Override @DefinedBy(Api.LANGUAGE_MODEL) 1382 public Set<Modifier> getModifiers() { 1383 long flags = flags(); 1384 return Flags.asModifierSet(flags & ~DEFAULT); 1385 } 1386 1387 @DefinedBy(Api.LANGUAGE_MODEL) 1388 public NestingKind getNestingKind() { 1389 complete(); 1390 if (owner.kind == PCK) 1391 return NestingKind.TOP_LEVEL; 1392 else if (name.isEmpty()) 1393 return NestingKind.ANONYMOUS; 1394 else if (owner.kind == MTH) 1395 return NestingKind.LOCAL; 1396 else 1397 return NestingKind.MEMBER; 1398 } 1399 1400 1401 @Override 1402 protected <A extends Annotation> Attribute.Compound getAttribute(final Class<A> annoType) { 1403 1404 Attribute.Compound attrib = super.getAttribute(annoType); 1405 1406 boolean inherited = annoType.isAnnotationPresent(Inherited.class); 1407 if (attrib != null || !inherited) 1408 return attrib; 1409 1410 // Search supertypes 1411 ClassSymbol superType = getSuperClassToSearchForAnnotations(); 1412 return superType == null ? null 1413 : superType.getAttribute(annoType); 1414 } 1415 1416 1417 1418 1419 @DefinedBy(Api.LANGUAGE_MODEL) 1420 public <R, P> R accept(ElementVisitor<R, P> v, P p) { 1421 return v.visitType(this, p); 1422 } 1423 1424 public <R, P> R accept(Symbol.Visitor<R, P> v, P p) { 1425 return v.visitClassSymbol(this, p); 1426 } 1427 1428 public void markAbstractIfNeeded(Types types) { 1429 if (types.enter.getEnv(this) != null && 1430 (flags() & ENUM) != 0 && types.supertype(type).tsym == types.syms.enumSym && 1431 (flags() & (FINAL | ABSTRACT)) == 0) { 1432 if (types.firstUnimplementedAbstract(this) != null) 1433 // add the ABSTRACT flag to an enum 1434 flags_field |= ABSTRACT; 1435 } 1436 } 1437 1438 /**Resets the Symbol into the state good for next round of annotation processing.*/ 1439 public void reset() { 1440 kind = TYP; 1441 erasure_field = null; 1442 members_field = null; 1443 flags_field = 0; 1444 if (type instanceof ClassType) { 1445 ClassType t = (ClassType)type; 1446 t.setEnclosingType(Type.noType); 1447 t.rank_field = -1; 1448 t.typarams_field = null; 1449 t.allparams_field = null; 1450 t.supertype_field = null; 1451 t.interfaces_field = null; 1452 t.all_interfaces_field = null; 1453 } 1454 clearAnnotationMetadata(); 1455 } 1456 1457 public void clearAnnotationMetadata() { 1458 metadata = null; 1459 annotationTypeMetadata = AnnotationTypeMetadata.notAnAnnotationType(); 1460 } 1461 1462 @Override 1463 public AnnotationTypeMetadata getAnnotationTypeMetadata() { 1464 return annotationTypeMetadata; 1465 } 1466 1467 @Override 1468 public boolean isAnnotationType() { 1469 return (flags_field & Flags.ANNOTATION) != 0; 1470 } 1471 1472 public void setAnnotationTypeMetadata(AnnotationTypeMetadata a) { 1473 Assert.checkNonNull(a); 1474 Assert.check(!annotationTypeMetadata.isMetadataForAnnotationType()); 1475 this.annotationTypeMetadata = a; 1476 } 1477 } 1478 1479 1480 /** A class for variable symbols 1481 */ 1482 public static class VarSymbol extends Symbol implements VariableElement { 1483 1484 /** The variable's declaration position. 1485 */ 1486 public int pos = Position.NOPOS; 1487 1488 /** The variable's address. Used for different purposes during 1489 * flow analysis, translation and code generation. 1490 * Flow analysis: 1491 * If this is a blank final or local variable, its sequence number. 1492 * Translation: 1493 * If this is a private field, its access number. 1494 * Code generation: 1495 * If this is a local variable, its logical slot number. 1496 */ 1497 public int adr = -1; 1498 1499 /** Construct a variable symbol, given its flags, name, type and owner. 1500 */ 1501 public VarSymbol(long flags, Name name, Type type, Symbol owner) { 1502 super(VAR, flags, name, type, owner); 1503 } 1504 1505 /** Clone this symbol with new owner. 1506 */ 1507 public VarSymbol clone(Symbol newOwner) { 1508 VarSymbol v = new VarSymbol(flags_field, name, type, newOwner) { 1509 @Override 1510 public Symbol baseSymbol() { 1511 return VarSymbol.this; 1512 } 1513 }; 1514 v.pos = pos; 1515 v.adr = adr; 1516 v.data = data; 1517 // System.out.println("clone " + v + " in " + newOwner);//DEBUG 1518 return v; 1519 } 1520 1521 public String toString() { 1522 return name.toString(); 1523 } 1524 1525 public Symbol asMemberOf(Type site, Types types) { 1526 return new VarSymbol(flags_field, name, types.memberType(site, this), owner); 1527 } 1528 1529 @DefinedBy(Api.LANGUAGE_MODEL) 1530 public ElementKind getKind() { 1531 long flags = flags(); 1532 if ((flags & PARAMETER) != 0) { 1533 if (isExceptionParameter()) 1534 return ElementKind.EXCEPTION_PARAMETER; 1535 else 1536 return ElementKind.PARAMETER; 1537 } else if ((flags & ENUM) != 0) { 1538 return ElementKind.ENUM_CONSTANT; 1539 } else if (owner.kind == TYP || owner.kind == ERR) { 1540 return ElementKind.FIELD; 1541 } else if (isResourceVariable()) { 1542 return ElementKind.RESOURCE_VARIABLE; 1543 } else { 1544 return ElementKind.LOCAL_VARIABLE; 1545 } 1546 } 1547 1548 @DefinedBy(Api.LANGUAGE_MODEL) 1549 public <R, P> R accept(ElementVisitor<R, P> v, P p) { 1550 return v.visitVariable(this, p); 1551 } 1552 1553 @DefinedBy(Api.LANGUAGE_MODEL) 1554 public Object getConstantValue() { // Mirror API 1555 return Constants.decode(getConstValue(), type); 1556 } 1557 1558 public void setLazyConstValue(final Env<AttrContext> env, 1559 final Attr attr, 1560 final JCVariableDecl variable) 1561 { 1562 setData((Callable<Object>)() -> attr.attribLazyConstantValue(env, variable, type)); 1563 } 1564 1565 /** 1566 * The variable's constant value, if this is a constant. 1567 * Before the constant value is evaluated, it points to an 1568 * initializer environment. If this is not a constant, it can 1569 * be used for other stuff. 1570 */ 1571 private Object data; 1572 1573 public boolean isExceptionParameter() { 1574 return data == ElementKind.EXCEPTION_PARAMETER; 1575 } 1576 1577 public boolean isResourceVariable() { 1578 return data == ElementKind.RESOURCE_VARIABLE; 1579 } 1580 1581 public Object getConstValue() { 1582 // TODO: Consider if getConstValue and getConstantValue can be collapsed 1583 if (data == ElementKind.EXCEPTION_PARAMETER || 1584 data == ElementKind.RESOURCE_VARIABLE) { 1585 return null; 1586 } else if (data instanceof Callable<?>) { 1587 // In this case, this is a final variable, with an as 1588 // yet unevaluated initializer. 1589 Callable<?> eval = (Callable<?>)data; 1590 data = null; // to make sure we don't evaluate this twice. 1591 try { 1592 data = eval.call(); 1593 } catch (Exception ex) { 1594 throw new AssertionError(ex); 1595 } 1596 } 1597 return data; 1598 } 1599 1600 public void setData(Object data) { 1601 Assert.check(!(data instanceof Env<?>), this); 1602 this.data = data; 1603 } 1604 1605 public <R, P> R accept(Symbol.Visitor<R, P> v, P p) { 1606 return v.visitVarSymbol(this, p); 1607 } 1608 } 1609 1610 /** A class for method symbols. 1611 */ 1612 public static class MethodSymbol extends Symbol implements ExecutableElement { 1613 1614 /** The code of the method. */ 1615 public Code code = null; 1616 1617 /** The extra (synthetic/mandated) parameters of the method. */ 1618 public List<VarSymbol> extraParams = List.nil(); 1619 1620 /** The captured local variables in an anonymous class */ 1621 public List<VarSymbol> capturedLocals = List.nil(); 1622 1623 /** The parameters of the method. */ 1624 public List<VarSymbol> params = null; 1625 1626 /** The names of the parameters */ 1627 public List<Name> savedParameterNames; 1628 1629 /** For an annotation type element, its default value if any. 1630 * The value is null if none appeared in the method 1631 * declaration. 1632 */ 1633 public Attribute defaultValue = null; 1634 1635 /** Construct a method symbol, given its flags, name, type and owner. 1636 */ 1637 public MethodSymbol(long flags, Name name, Type type, Symbol owner) { 1638 super(MTH, flags, name, type, owner); 1639 if (owner.type.hasTag(TYPEVAR)) Assert.error(owner + "." + name); 1640 } 1641 1642 /** Clone this symbol with new owner. 1643 */ 1644 public MethodSymbol clone(Symbol newOwner) { 1645 MethodSymbol m = new MethodSymbol(flags_field, name, type, newOwner) { 1646 @Override 1647 public Symbol baseSymbol() { 1648 return MethodSymbol.this; 1649 } 1650 }; 1651 m.code = code; 1652 return m; 1653 } 1654 1655 @Override @DefinedBy(Api.LANGUAGE_MODEL) 1656 public Set<Modifier> getModifiers() { 1657 long flags = flags(); 1658 return Flags.asModifierSet((flags & DEFAULT) != 0 ? flags & ~ABSTRACT : flags); 1659 } 1660 1661 /** The Java source which this symbol represents. 1662 */ 1663 public String toString() { 1664 if ((flags() & BLOCK) != 0) { 1665 return owner.name.toString(); 1666 } else { 1667 String s = (name == name.table.names.init) 1668 ? owner.name.toString() 1669 : name.toString(); 1670 if (type != null) { 1671 if (type.hasTag(FORALL)) 1672 s = "<" + ((ForAll)type).getTypeArguments() + ">" + s; 1673 s += "(" + type.argtypes((flags() & VARARGS) != 0) + ")"; 1674 } 1675 return s; 1676 } 1677 } 1678 1679 public boolean isDynamic() { 1680 return false; 1681 } 1682 1683 /** find a symbol that this (proxy method) symbol implements. 1684 * @param c The class whose members are searched for 1685 * implementations 1686 */ 1687 public Symbol implemented(TypeSymbol c, Types types) { 1688 Symbol impl = null; 1689 for (List<Type> is = types.interfaces(c.type); 1690 impl == null && is.nonEmpty(); 1691 is = is.tail) { 1692 TypeSymbol i = is.head.tsym; 1693 impl = implementedIn(i, types); 1694 if (impl == null) 1695 impl = implemented(i, types); 1696 } 1697 return impl; 1698 } 1699 1700 public Symbol implementedIn(TypeSymbol c, Types types) { 1701 Symbol impl = null; 1702 for (Symbol sym : c.members().getSymbolsByName(name)) { 1703 if (this.overrides(sym, (TypeSymbol)owner, types, true) && 1704 // FIXME: I suspect the following requires a 1705 // subst() for a parametric return type. 1706 types.isSameType(type.getReturnType(), 1707 types.memberType(owner.type, sym).getReturnType())) { 1708 impl = sym; 1709 } 1710 } 1711 return impl; 1712 } 1713 1714 /** Will the erasure of this method be considered by the VM to 1715 * override the erasure of the other when seen from class `origin'? 1716 */ 1717 public boolean binaryOverrides(Symbol _other, TypeSymbol origin, Types types) { 1718 if (isConstructor() || _other.kind != MTH) return false; 1719 1720 if (this == _other) return true; 1721 MethodSymbol other = (MethodSymbol)_other; 1722 1723 // check for a direct implementation 1724 if (other.isOverridableIn((TypeSymbol)owner) && 1725 types.asSuper(owner.type, other.owner) != null && 1726 types.isSameType(erasure(types), other.erasure(types))) 1727 return true; 1728 1729 // check for an inherited implementation 1730 return 1731 (flags() & ABSTRACT) == 0 && 1732 other.isOverridableIn(origin) && 1733 this.isMemberOf(origin, types) && 1734 types.isSameType(erasure(types), other.erasure(types)); 1735 } 1736 1737 /** The implementation of this (abstract) symbol in class origin, 1738 * from the VM's point of view, null if method does not have an 1739 * implementation in class. 1740 * @param origin The class of which the implementation is a member. 1741 */ 1742 public MethodSymbol binaryImplementation(ClassSymbol origin, Types types) { 1743 for (TypeSymbol c = origin; c != null; c = types.supertype(c.type).tsym) { 1744 for (Symbol sym : c.members().getSymbolsByName(name)) { 1745 if (sym.kind == MTH && 1746 ((MethodSymbol)sym).binaryOverrides(this, origin, types)) 1747 return (MethodSymbol)sym; 1748 } 1749 } 1750 return null; 1751 } 1752 1753 /** Does this symbol override `other' symbol, when both are seen as 1754 * members of class `origin'? It is assumed that _other is a member 1755 * of origin. 1756 * 1757 * It is assumed that both symbols have the same name. The static 1758 * modifier is ignored for this test. 1759 * 1760 * A quirk in the works is that if the receiver is a method symbol for 1761 * an inherited abstract method we answer false summarily all else being 1762 * immaterial. Abstract "own" methods (i.e `this' is a direct member of 1763 * origin) don't get rejected as summarily and are put to test against the 1764 * suitable criteria. 1765 * 1766 * See JLS 8.4.6.1 (without transitivity) and 8.4.6.4 1767 */ 1768 public boolean overrides(Symbol _other, TypeSymbol origin, Types types, boolean checkResult) { 1769 return overrides(_other, origin, types, checkResult, true); 1770 } 1771 1772 /** Does this symbol override `other' symbol, when both are seen as 1773 * members of class `origin'? It is assumed that _other is a member 1774 * of origin. 1775 * 1776 * Caveat: If `this' is an abstract inherited member of origin, it is 1777 * deemed to override `other' only when `requireConcreteIfInherited' 1778 * is false. 1779 * 1780 * It is assumed that both symbols have the same name. The static 1781 * modifier is ignored for this test. 1782 * 1783 * See JLS 8.4.6.1 (without transitivity) and 8.4.6.4 1784 */ 1785 public boolean overrides(Symbol _other, TypeSymbol origin, Types types, boolean checkResult, 1786 boolean requireConcreteIfInherited) { 1787 if (isConstructor() || _other.kind != MTH) return false; 1788 1789 if (this == _other) return true; 1790 MethodSymbol other = (MethodSymbol)_other; 1791 1792 // check for a direct implementation 1793 if (other.isOverridableIn((TypeSymbol)owner) && 1794 types.asSuper(owner.type, other.owner) != null) { 1795 Type mt = types.memberType(owner.type, this); 1796 Type ot = types.memberType(owner.type, other); 1797 if (types.isSubSignature(mt, ot)) { 1798 if (!checkResult) 1799 return true; 1800 if (types.returnTypeSubstitutable(mt, ot)) 1801 return true; 1802 } 1803 } 1804 1805 // check for an inherited implementation 1806 if (((flags() & ABSTRACT) != 0 && requireConcreteIfInherited) || 1807 ((other.flags() & ABSTRACT) == 0 && (other.flags() & DEFAULT) == 0) || 1808 !other.isOverridableIn(origin) || 1809 !this.isMemberOf(origin, types)) 1810 return false; 1811 1812 // assert types.asSuper(origin.type, other.owner) != null; 1813 Type mt = types.memberType(origin.type, this); 1814 Type ot = types.memberType(origin.type, other); 1815 return 1816 types.isSubSignature(mt, ot) && 1817 (!checkResult || types.resultSubtype(mt, ot, types.noWarnings)); 1818 } 1819 1820 private boolean isOverridableIn(TypeSymbol origin) { 1821 // JLS 8.4.6.1 1822 switch ((int)(flags_field & Flags.AccessFlags)) { 1823 case Flags.PRIVATE: 1824 return false; 1825 case Flags.PUBLIC: 1826 return !this.owner.isInterface() || 1827 (flags_field & STATIC) == 0; 1828 case Flags.PROTECTED: 1829 return (origin.flags() & INTERFACE) == 0; 1830 case 0: 1831 // for package private: can only override in the same 1832 // package 1833 return 1834 this.packge() == origin.packge() && 1835 (origin.flags() & INTERFACE) == 0; 1836 default: 1837 return false; 1838 } 1839 } 1840 1841 @Override 1842 public boolean isInheritedIn(Symbol clazz, Types types) { 1843 switch ((int)(flags_field & Flags.AccessFlags)) { 1844 case PUBLIC: 1845 return !this.owner.isInterface() || 1846 clazz == owner || 1847 (flags_field & STATIC) == 0; 1848 default: 1849 return super.isInheritedIn(clazz, types); 1850 } 1851 } 1852 1853 public boolean isLambdaMethod() { 1854 return (flags() & LAMBDA_METHOD) == LAMBDA_METHOD; 1855 } 1856 1857 /** The implementation of this (abstract) symbol in class origin; 1858 * null if none exists. Synthetic methods are not considered 1859 * as possible implementations. 1860 */ 1861 public MethodSymbol implementation(TypeSymbol origin, Types types, boolean checkResult) { 1862 return implementation(origin, types, checkResult, implementation_filter); 1863 } 1864 // where 1865 public static final Filter<Symbol> implementation_filter = s -> 1866 s.kind == MTH && (s.flags() & SYNTHETIC) == 0; 1867 1868 public MethodSymbol implementation(TypeSymbol origin, Types types, boolean checkResult, Filter<Symbol> implFilter) { 1869 MethodSymbol res = types.implementation(this, origin, checkResult, implFilter); 1870 if (res != null) 1871 return res; 1872 // if origin is derived from a raw type, we might have missed 1873 // an implementation because we do not know enough about instantiations. 1874 // in this case continue with the supertype as origin. 1875 if (types.isDerivedRaw(origin.type) && !origin.isInterface()) 1876 return implementation(types.supertype(origin.type).tsym, types, checkResult); 1877 else 1878 return null; 1879 } 1880 1881 public List<VarSymbol> params() { 1882 owner.complete(); 1883 if (params == null) { 1884 // If ClassReader.saveParameterNames has been set true, then 1885 // savedParameterNames will be set to a list of names that 1886 // matches the types in type.getParameterTypes(). If any names 1887 // were not found in the class file, those names in the list will 1888 // be set to the empty name. 1889 // If ClassReader.saveParameterNames has been set false, then 1890 // savedParameterNames will be null. 1891 List<Name> paramNames = savedParameterNames; 1892 savedParameterNames = null; 1893 // discard the provided names if the list of names is the wrong size. 1894 if (paramNames == null || paramNames.size() != type.getParameterTypes().size()) { 1895 paramNames = List.nil(); 1896 } 1897 ListBuffer<VarSymbol> buf = new ListBuffer<>(); 1898 List<Name> remaining = paramNames; 1899 // assert: remaining and paramNames are both empty or both 1900 // have same cardinality as type.getParameterTypes() 1901 int i = 0; 1902 for (Type t : type.getParameterTypes()) { 1903 Name paramName; 1904 if (remaining.isEmpty()) { 1905 // no names for any parameters available 1906 paramName = createArgName(i, paramNames); 1907 } else { 1908 paramName = remaining.head; 1909 remaining = remaining.tail; 1910 if (paramName.isEmpty()) { 1911 // no name for this specific parameter 1912 paramName = createArgName(i, paramNames); 1913 } 1914 } 1915 buf.append(new VarSymbol(PARAMETER, paramName, t, this)); 1916 i++; 1917 } 1918 params = buf.toList(); 1919 } 1920 return params; 1921 } 1922 1923 // Create a name for the argument at position 'index' that is not in 1924 // the exclude list. In normal use, either no names will have been 1925 // provided, in which case the exclude list is empty, or all the names 1926 // will have been provided, in which case this method will not be called. 1927 private Name createArgName(int index, List<Name> exclude) { 1928 String prefix = "arg"; 1929 while (true) { 1930 Name argName = name.table.fromString(prefix + index); 1931 if (!exclude.contains(argName)) 1932 return argName; 1933 prefix += "$"; 1934 } 1935 } 1936 1937 public Symbol asMemberOf(Type site, Types types) { 1938 return new MethodSymbol(flags_field, name, types.memberType(site, this), owner); 1939 } 1940 1941 @DefinedBy(Api.LANGUAGE_MODEL) 1942 public ElementKind getKind() { 1943 if (name == name.table.names.init) 1944 return ElementKind.CONSTRUCTOR; 1945 else if (name == name.table.names.clinit) 1946 return ElementKind.STATIC_INIT; 1947 else if ((flags() & BLOCK) != 0) 1948 return isStatic() ? ElementKind.STATIC_INIT : ElementKind.INSTANCE_INIT; 1949 else 1950 return ElementKind.METHOD; 1951 } 1952 1953 public boolean isStaticOrInstanceInit() { 1954 return getKind() == ElementKind.STATIC_INIT || 1955 getKind() == ElementKind.INSTANCE_INIT; 1956 } 1957 1958 @DefinedBy(Api.LANGUAGE_MODEL) 1959 public Attribute getDefaultValue() { 1960 return defaultValue; 1961 } 1962 1963 @DefinedBy(Api.LANGUAGE_MODEL) 1964 public List<VarSymbol> getParameters() { 1965 return params(); 1966 } 1967 1968 @DefinedBy(Api.LANGUAGE_MODEL) 1969 public boolean isVarArgs() { 1970 return (flags() & VARARGS) != 0; 1971 } 1972 1973 @DefinedBy(Api.LANGUAGE_MODEL) 1974 public boolean isDefault() { 1975 return (flags() & DEFAULT) != 0; 1976 } 1977 1978 @DefinedBy(Api.LANGUAGE_MODEL) 1979 public <R, P> R accept(ElementVisitor<R, P> v, P p) { 1980 return v.visitExecutable(this, p); 1981 } 1982 1983 public <R, P> R accept(Symbol.Visitor<R, P> v, P p) { 1984 return v.visitMethodSymbol(this, p); 1985 } 1986 1987 @DefinedBy(Api.LANGUAGE_MODEL) 1988 public Type getReceiverType() { 1989 return asType().getReceiverType(); 1990 } 1991 1992 @DefinedBy(Api.LANGUAGE_MODEL) 1993 public Type getReturnType() { 1994 return asType().getReturnType(); 1995 } 1996 1997 @DefinedBy(Api.LANGUAGE_MODEL) 1998 public List<Type> getThrownTypes() { 1999 return asType().getThrownTypes(); 2000 } 2001 } 2002 2003 /** A class for invokedynamic method calls. 2004 */ 2005 public static class DynamicMethodSymbol extends MethodSymbol { 2006 2007 public Object[] staticArgs; 2008 public Symbol bsm; 2009 public int bsmKind; 2010 2011 public DynamicMethodSymbol(Name name, Symbol owner, int bsmKind, MethodSymbol bsm, Type type, Object[] staticArgs) { 2012 super(0, name, type, owner); 2013 this.bsm = bsm; 2014 this.bsmKind = bsmKind; 2015 this.staticArgs = staticArgs; 2016 } 2017 2018 @Override 2019 public boolean isDynamic() { 2020 return true; 2021 } 2022 } 2023 2024 /** A class for predefined operators. 2025 */ 2026 public static class OperatorSymbol extends MethodSymbol { 2027 2028 public int opcode; 2029 private int accessCode = Integer.MIN_VALUE; 2030 2031 public OperatorSymbol(Name name, Type type, int opcode, Symbol owner) { 2032 super(PUBLIC | STATIC, name, type, owner); 2033 this.opcode = opcode; 2034 } 2035 2036 @Override 2037 public <R, P> R accept(Symbol.Visitor<R, P> v, P p) { 2038 return v.visitOperatorSymbol(this, p); 2039 } 2040 2041 public int getAccessCode(Tag tag) { 2042 if (accessCode != Integer.MIN_VALUE && !tag.isIncOrDecUnaryOp()) { 2043 return accessCode; 2044 } 2045 accessCode = AccessCode.from(tag, opcode); 2046 return accessCode; 2047 } 2048 2049 /** Access codes for dereferencing, assignment, 2050 * and pre/post increment/decrement. 2051 2052 * All access codes for accesses to the current class are even. 2053 * If a member of the superclass should be accessed instead (because 2054 * access was via a qualified super), add one to the corresponding code 2055 * for the current class, making the number odd. 2056 * This numbering scheme is used by the backend to decide whether 2057 * to issue an invokevirtual or invokespecial call. 2058 * 2059 * @see Gen#visitSelect(JCFieldAccess tree) 2060 */ 2061 public enum AccessCode { 2062 UNKNOWN(-1, Tag.NO_TAG), 2063 DEREF(0, Tag.NO_TAG), 2064 ASSIGN(2, Tag.ASSIGN), 2065 PREINC(4, Tag.PREINC), 2066 PREDEC(6, Tag.PREDEC), 2067 POSTINC(8, Tag.POSTINC), 2068 POSTDEC(10, Tag.POSTDEC), 2069 FIRSTASGOP(12, Tag.NO_TAG); 2070 2071 public final int code; 2072 public final Tag tag; 2073 public static final int numberOfAccessCodes = (lushrl - ishll + lxor + 2 - iadd) * 2 + FIRSTASGOP.code + 2; 2074 2075 AccessCode(int code, Tag tag) { 2076 this.code = code; 2077 this.tag = tag; 2078 } 2079 2080 static public AccessCode getFromCode(int code) { 2081 for (AccessCode aCodes : AccessCode.values()) { 2082 if (aCodes.code == code) { 2083 return aCodes; 2084 } 2085 } 2086 return UNKNOWN; 2087 } 2088 2089 static int from(Tag tag, int opcode) { 2090 /** Map bytecode of binary operation to access code of corresponding 2091 * assignment operation. This is always an even number. 2092 */ 2093 switch (tag) { 2094 case PREINC: 2095 return AccessCode.PREINC.code; 2096 case PREDEC: 2097 return AccessCode.PREDEC.code; 2098 case POSTINC: 2099 return AccessCode.POSTINC.code; 2100 case POSTDEC: 2101 return AccessCode.POSTDEC.code; 2102 } 2103 if (iadd <= opcode && opcode <= lxor) { 2104 return (opcode - iadd) * 2 + FIRSTASGOP.code; 2105 } else if (opcode == string_add) { 2106 return (lxor + 1 - iadd) * 2 + FIRSTASGOP.code; 2107 } else if (ishll <= opcode && opcode <= lushrl) { 2108 return (opcode - ishll + lxor + 2 - iadd) * 2 + FIRSTASGOP.code; 2109 } 2110 return -1; 2111 } 2112 } 2113 } 2114 2115 /** Symbol completer interface. 2116 */ 2117 public static interface Completer { 2118 2119 /** Dummy completer to be used when the symbol has been completed or 2120 * does not need completion. 2121 */ 2122 public final static Completer NULL_COMPLETER = new Completer() { 2123 public void complete(Symbol sym) { } 2124 public boolean isTerminal() { return true; } 2125 }; 2126 2127 void complete(Symbol sym) throws CompletionFailure; 2128 2129 /** Returns true if this completer is <em>terminal</em>. A terminal 2130 * completer is used as a place holder when the symbol is completed. 2131 * Calling complete on a terminal completer will not affect the symbol. 2132 * 2133 * The dummy NULL_COMPLETER and the GraphDependencies completer are 2134 * examples of terminal completers. 2135 * 2136 * @return true iff this completer is terminal 2137 */ 2138 default boolean isTerminal() { 2139 return false; 2140 } 2141 } 2142 2143 public static class CompletionFailure extends RuntimeException { 2144 private static final long serialVersionUID = 0; 2145 public Symbol sym; 2146 2147 /** A diagnostic object describing the failure 2148 */ 2149 public JCDiagnostic diag; 2150 2151 /** A localized string describing the failure. 2152 * @deprecated Use {@code getDetail()} or {@code getMessage()} 2153 */ 2154 @Deprecated 2155 public String errmsg; 2156 2157 public CompletionFailure(Symbol sym, String errmsg) { 2158 this.sym = sym; 2159 this.errmsg = errmsg; 2160 // this.printStackTrace();//DEBUG 2161 } 2162 2163 public CompletionFailure(Symbol sym, JCDiagnostic diag) { 2164 this.sym = sym; 2165 this.diag = diag; 2166 // this.printStackTrace();//DEBUG 2167 } 2168 2169 public JCDiagnostic getDiagnostic() { 2170 return diag; 2171 } 2172 2173 @Override 2174 public String getMessage() { 2175 if (diag != null) 2176 return diag.getMessage(null); 2177 else 2178 return errmsg; 2179 } 2180 2181 public Object getDetailValue() { 2182 return (diag != null ? diag : errmsg); 2183 } 2184 2185 @Override 2186 public CompletionFailure initCause(Throwable cause) { 2187 super.initCause(cause); 2188 return this; 2189 } 2190 2191 } 2192 2193 /** 2194 * A visitor for symbols. A visitor is used to implement operations 2195 * (or relations) on symbols. Most common operations on types are 2196 * binary relations and this interface is designed for binary 2197 * relations, that is, operations on the form 2198 * Symbol × P → R. 2199 * <!-- In plain text: Type x P -> R --> 2200 * 2201 * @param <R> the return type of the operation implemented by this 2202 * visitor; use Void if no return type is needed. 2203 * @param <P> the type of the second argument (the first being the 2204 * symbol itself) of the operation implemented by this visitor; use 2205 * Void if a second argument is not needed. 2206 */ 2207 public interface Visitor<R,P> { 2208 R visitClassSymbol(ClassSymbol s, P arg); 2209 R visitMethodSymbol(MethodSymbol s, P arg); 2210 R visitPackageSymbol(PackageSymbol s, P arg); 2211 R visitOperatorSymbol(OperatorSymbol s, P arg); 2212 R visitVarSymbol(VarSymbol s, P arg); 2213 R visitTypeSymbol(TypeSymbol s, P arg); 2214 R visitSymbol(Symbol s, P arg); 2215 } 2216 }