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 Name getSimpleName() { 954 Name fullName = getQualifiedName(); 955 int lastPeriod = fullName.lastIndexOf((byte)'.'); 956 if (lastPeriod == -1) { 957 return fullName; 958 } else { 959 return fullName.subName(lastPeriod + 1, fullName.length()); 960 } 961 } 962 963 @Override @DefinedBy(Api.LANGUAGE_MODEL) 964 public boolean isOpen() { 965 return flags.contains(ModuleFlags.OPEN); 966 } 967 968 @Override @DefinedBy(Api.LANGUAGE_MODEL) 969 public boolean isUnnamed() { 970 return name.isEmpty() && owner == null; 971 } 972 973 @Override 974 public boolean isDeprecated() { 975 return hasDeprecatedAnnotation(); 976 } 977 978 public boolean isNoModule() { 979 return false; 980 } 981 982 @Override @DefinedBy(Api.LANGUAGE_MODEL) 983 public ElementKind getKind() { 984 return ElementKind.MODULE; 985 } 986 987 @Override @DefinedBy(Api.LANGUAGE_MODEL) 988 public java.util.List<Directive> getDirectives() { 989 complete(); 990 completeUsesProvides(); 991 return Collections.unmodifiableList(directives); 992 } 993 994 public void completeUsesProvides() { 995 if (usesProvidesCompleter != Completer.NULL_COMPLETER) { 996 Completer c = usesProvidesCompleter; 997 usesProvidesCompleter = Completer.NULL_COMPLETER; 998 c.complete(this); 999 } 1000 } 1001 1002 @Override 1003 public ClassSymbol outermostClass() { 1004 return null; 1005 } 1006 1007 @Override 1008 public String toString() { 1009 // TODO: the following strings should be localized 1010 // Do this with custom anon subtypes in Symtab 1011 String n = (name == null) ? "<unknown>" 1012 : (name.isEmpty()) ? "<unnamed>" 1013 : String.valueOf(name); 1014 return n; 1015 } 1016 1017 @Override @DefinedBy(Api.LANGUAGE_MODEL) 1018 public <R, P> R accept(ElementVisitor<R, P> v, P p) { 1019 return v.visitModule(this, p); 1020 } 1021 1022 @Override @DefinedBy(Api.LANGUAGE_MODEL) 1023 public List<Symbol> getEnclosedElements() { 1024 List<Symbol> list = List.nil(); 1025 for (Symbol sym : enclosedPackages) { 1026 if (sym.members().anyMatch(m -> m.kind == TYP)) 1027 list = list.prepend(sym); 1028 } 1029 return list; 1030 } 1031 1032 public void reset() { 1033 this.directives = null; 1034 this.requires = null; 1035 this.exports = null; 1036 this.provides = null; 1037 this.uses = null; 1038 this.visiblePackages = null; 1039 } 1040 1041 } 1042 1043 public enum ModuleFlags { 1044 OPEN(0x0020), 1045 SYNTHETIC(0x1000), 1046 MANDATED(0x8000); 1047 1048 public static int value(Set<ModuleFlags> s) { 1049 int v = 0; 1050 for (ModuleFlags f: s) 1051 v |= f.value; 1052 return v; 1053 } 1054 1055 private ModuleFlags(int value) { 1056 this.value = value; 1057 } 1058 1059 public final int value; 1060 } 1061 1062 public enum ModuleResolutionFlags { 1063 DO_NOT_RESOLVE_BY_DEFAULT(0x0001), 1064 WARN_DEPRECATED(0x0002), 1065 WARN_DEPRECATED_REMOVAL(0x0004), 1066 WARN_INCUBATING(0x0008); 1067 1068 public static int value(Set<ModuleResolutionFlags> s) { 1069 int v = 0; 1070 for (ModuleResolutionFlags f: s) 1071 v |= f.value; 1072 return v; 1073 } 1074 1075 private ModuleResolutionFlags(int value) { 1076 this.value = value; 1077 } 1078 1079 public final int value; 1080 } 1081 1082 /** A class for package symbols 1083 */ 1084 public static class PackageSymbol extends TypeSymbol 1085 implements PackageElement { 1086 1087 public WriteableScope members_field; 1088 public Name fullname; 1089 public ClassSymbol package_info; // see bug 6443073 1090 public ModuleSymbol modle; 1091 // the file containing the documentation comments for the package 1092 public JavaFileObject sourcefile; 1093 1094 public PackageSymbol(Name name, Type type, Symbol owner) { 1095 super(PCK, 0, name, type, owner); 1096 this.members_field = null; 1097 this.fullname = formFullName(name, owner); 1098 } 1099 1100 public PackageSymbol(Name name, Symbol owner) { 1101 this(name, null, owner); 1102 this.type = new PackageType(this); 1103 } 1104 1105 public String toString() { 1106 return fullname.toString(); 1107 } 1108 1109 @DefinedBy(Api.LANGUAGE_MODEL) 1110 public Name getQualifiedName() { 1111 return fullname; 1112 } 1113 1114 @DefinedBy(Api.LANGUAGE_MODEL) 1115 public boolean isUnnamed() { 1116 return name.isEmpty() && owner != null; 1117 } 1118 1119 public WriteableScope members() { 1120 complete(); 1121 return members_field; 1122 } 1123 1124 public long flags() { 1125 complete(); 1126 return flags_field; 1127 } 1128 1129 @Override 1130 public List<Attribute.Compound> getRawAttributes() { 1131 complete(); 1132 if (package_info != null) { 1133 package_info.complete(); 1134 mergeAttributes(); 1135 } 1136 return super.getRawAttributes(); 1137 } 1138 1139 private void mergeAttributes() { 1140 if (metadata == null && 1141 package_info.metadata != null) { 1142 metadata = new SymbolMetadata(this); 1143 metadata.setAttributes(package_info.metadata); 1144 } 1145 } 1146 1147 /** A package "exists" if a type or package that exists has 1148 * been seen within it. 1149 */ 1150 public boolean exists() { 1151 return (flags_field & EXISTS) != 0; 1152 } 1153 1154 @DefinedBy(Api.LANGUAGE_MODEL) 1155 public ElementKind getKind() { 1156 return ElementKind.PACKAGE; 1157 } 1158 1159 @DefinedBy(Api.LANGUAGE_MODEL) 1160 public Symbol getEnclosingElement() { 1161 return modle != null && !modle.isNoModule() ? modle : null; 1162 } 1163 1164 @DefinedBy(Api.LANGUAGE_MODEL) 1165 public <R, P> R accept(ElementVisitor<R, P> v, P p) { 1166 return v.visitPackage(this, p); 1167 } 1168 1169 public <R, P> R accept(Symbol.Visitor<R, P> v, P p) { 1170 return v.visitPackageSymbol(this, p); 1171 } 1172 1173 /**Resets the Symbol into the state good for next round of annotation processing.*/ 1174 public void reset() { 1175 metadata = null; 1176 } 1177 1178 } 1179 1180 /** A class for class symbols 1181 */ 1182 public static class ClassSymbol extends TypeSymbol implements TypeElement { 1183 1184 /** a scope for all class members; variables, methods and inner classes 1185 * type parameters are not part of this scope 1186 */ 1187 public WriteableScope members_field; 1188 1189 /** the fully qualified name of the class, i.e. pck.outer.inner. 1190 * null for anonymous classes 1191 */ 1192 public Name fullname; 1193 1194 /** the fully qualified name of the class after converting to flat 1195 * representation, i.e. pck.outer$inner, 1196 * set externally for local and anonymous classes 1197 */ 1198 public Name flatname; 1199 1200 /** the sourcefile where the class came from 1201 */ 1202 public JavaFileObject sourcefile; 1203 1204 /** the classfile from where to load this class 1205 * this will have extension .class or .java 1206 */ 1207 public JavaFileObject classfile; 1208 1209 /** the list of translated local classes (used for generating 1210 * InnerClasses attribute) 1211 */ 1212 public List<ClassSymbol> trans_local; 1213 1214 /** the constant pool of the class 1215 */ 1216 public Pool pool; 1217 1218 /** the annotation metadata attached to this class */ 1219 private AnnotationTypeMetadata annotationTypeMetadata; 1220 1221 public ClassSymbol(long flags, Name name, Type type, Symbol owner) { 1222 super(TYP, flags, name, type, owner); 1223 this.members_field = null; 1224 this.fullname = formFullName(name, owner); 1225 this.flatname = formFlatName(name, owner); 1226 this.sourcefile = null; 1227 this.classfile = null; 1228 this.pool = null; 1229 this.annotationTypeMetadata = AnnotationTypeMetadata.notAnAnnotationType(); 1230 } 1231 1232 public ClassSymbol(long flags, Name name, Symbol owner) { 1233 this( 1234 flags, 1235 name, 1236 new ClassType(Type.noType, null, null), 1237 owner); 1238 this.type.tsym = this; 1239 } 1240 1241 /** The Java source which this symbol represents. 1242 */ 1243 public String toString() { 1244 return className(); 1245 } 1246 1247 public long flags() { 1248 complete(); 1249 return flags_field; 1250 } 1251 1252 public WriteableScope members() { 1253 complete(); 1254 return members_field; 1255 } 1256 1257 @Override 1258 public List<Attribute.Compound> getRawAttributes() { 1259 complete(); 1260 return super.getRawAttributes(); 1261 } 1262 1263 @Override 1264 public List<Attribute.TypeCompound> getRawTypeAttributes() { 1265 complete(); 1266 return super.getRawTypeAttributes(); 1267 } 1268 1269 public Type erasure(Types types) { 1270 if (erasure_field == null) 1271 erasure_field = new ClassType(types.erasure(type.getEnclosingType()), 1272 List.nil(), this, 1273 type.getMetadata()); 1274 return erasure_field; 1275 } 1276 1277 public String className() { 1278 if (name.isEmpty()) 1279 return 1280 Log.getLocalizedString("anonymous.class", flatname); 1281 else 1282 return fullname.toString(); 1283 } 1284 1285 @DefinedBy(Api.LANGUAGE_MODEL) 1286 public Name getQualifiedName() { 1287 return fullname; 1288 } 1289 1290 public Name flatName() { 1291 return flatname; 1292 } 1293 1294 public boolean isSubClass(Symbol base, Types types) { 1295 if (this == base) { 1296 return true; 1297 } else if ((base.flags() & INTERFACE) != 0) { 1298 for (Type t = type; t.hasTag(CLASS); t = types.supertype(t)) 1299 for (List<Type> is = types.interfaces(t); 1300 is.nonEmpty(); 1301 is = is.tail) 1302 if (is.head.tsym.isSubClass(base, types)) return true; 1303 } else { 1304 for (Type t = type; t.hasTag(CLASS); t = types.supertype(t)) 1305 if (t.tsym == base) return true; 1306 } 1307 return false; 1308 } 1309 1310 /** Complete the elaboration of this symbol's definition. 1311 */ 1312 public void complete() throws CompletionFailure { 1313 try { 1314 super.complete(); 1315 } catch (CompletionFailure ex) { 1316 // quiet error recovery 1317 flags_field |= (PUBLIC|STATIC); 1318 this.type = new ErrorType(this, Type.noType); 1319 throw ex; 1320 } 1321 } 1322 1323 @DefinedBy(Api.LANGUAGE_MODEL) 1324 public List<Type> getInterfaces() { 1325 complete(); 1326 if (type instanceof ClassType) { 1327 ClassType t = (ClassType)type; 1328 if (t.interfaces_field == null) // FIXME: shouldn't be null 1329 t.interfaces_field = List.nil(); 1330 if (t.all_interfaces_field != null) 1331 return Type.getModelTypes(t.all_interfaces_field); 1332 return t.interfaces_field; 1333 } else { 1334 return List.nil(); 1335 } 1336 } 1337 1338 @DefinedBy(Api.LANGUAGE_MODEL) 1339 public Type getSuperclass() { 1340 complete(); 1341 if (type instanceof ClassType) { 1342 ClassType t = (ClassType)type; 1343 if (t.supertype_field == null) // FIXME: shouldn't be null 1344 t.supertype_field = Type.noType; 1345 // An interface has no superclass; its supertype is Object. 1346 return t.isInterface() 1347 ? Type.noType 1348 : t.supertype_field.getModelType(); 1349 } else { 1350 return Type.noType; 1351 } 1352 } 1353 1354 /** 1355 * Returns the next class to search for inherited annotations or {@code null} 1356 * if the next class can't be found. 1357 */ 1358 private ClassSymbol getSuperClassToSearchForAnnotations() { 1359 1360 Type sup = getSuperclass(); 1361 1362 if (!sup.hasTag(CLASS) || sup.isErroneous()) 1363 return null; 1364 1365 return (ClassSymbol) sup.tsym; 1366 } 1367 1368 1369 @Override 1370 protected <A extends Annotation> A[] getInheritedAnnotations(Class<A> annoType) { 1371 1372 ClassSymbol sup = getSuperClassToSearchForAnnotations(); 1373 1374 return sup == null ? super.getInheritedAnnotations(annoType) 1375 : sup.getAnnotationsByType(annoType); 1376 } 1377 1378 1379 @DefinedBy(Api.LANGUAGE_MODEL) 1380 public ElementKind getKind() { 1381 long flags = flags(); 1382 if ((flags & ANNOTATION) != 0) 1383 return ElementKind.ANNOTATION_TYPE; 1384 else if ((flags & INTERFACE) != 0) 1385 return ElementKind.INTERFACE; 1386 else if ((flags & ENUM) != 0) 1387 return ElementKind.ENUM; 1388 else 1389 return ElementKind.CLASS; 1390 } 1391 1392 @Override @DefinedBy(Api.LANGUAGE_MODEL) 1393 public Set<Modifier> getModifiers() { 1394 long flags = flags(); 1395 return Flags.asModifierSet(flags & ~DEFAULT); 1396 } 1397 1398 @DefinedBy(Api.LANGUAGE_MODEL) 1399 public NestingKind getNestingKind() { 1400 complete(); 1401 if (owner.kind == PCK) 1402 return NestingKind.TOP_LEVEL; 1403 else if (name.isEmpty()) 1404 return NestingKind.ANONYMOUS; 1405 else if (owner.kind == MTH) 1406 return NestingKind.LOCAL; 1407 else 1408 return NestingKind.MEMBER; 1409 } 1410 1411 1412 @Override 1413 protected <A extends Annotation> Attribute.Compound getAttribute(final Class<A> annoType) { 1414 1415 Attribute.Compound attrib = super.getAttribute(annoType); 1416 1417 boolean inherited = annoType.isAnnotationPresent(Inherited.class); 1418 if (attrib != null || !inherited) 1419 return attrib; 1420 1421 // Search supertypes 1422 ClassSymbol superType = getSuperClassToSearchForAnnotations(); 1423 return superType == null ? null 1424 : superType.getAttribute(annoType); 1425 } 1426 1427 1428 1429 1430 @DefinedBy(Api.LANGUAGE_MODEL) 1431 public <R, P> R accept(ElementVisitor<R, P> v, P p) { 1432 return v.visitType(this, p); 1433 } 1434 1435 public <R, P> R accept(Symbol.Visitor<R, P> v, P p) { 1436 return v.visitClassSymbol(this, p); 1437 } 1438 1439 public void markAbstractIfNeeded(Types types) { 1440 if (types.enter.getEnv(this) != null && 1441 (flags() & ENUM) != 0 && types.supertype(type).tsym == types.syms.enumSym && 1442 (flags() & (FINAL | ABSTRACT)) == 0) { 1443 if (types.firstUnimplementedAbstract(this) != null) 1444 // add the ABSTRACT flag to an enum 1445 flags_field |= ABSTRACT; 1446 } 1447 } 1448 1449 /**Resets the Symbol into the state good for next round of annotation processing.*/ 1450 public void reset() { 1451 kind = TYP; 1452 erasure_field = null; 1453 members_field = null; 1454 flags_field = 0; 1455 if (type instanceof ClassType) { 1456 ClassType t = (ClassType)type; 1457 t.setEnclosingType(Type.noType); 1458 t.rank_field = -1; 1459 t.typarams_field = null; 1460 t.allparams_field = null; 1461 t.supertype_field = null; 1462 t.interfaces_field = null; 1463 t.all_interfaces_field = null; 1464 } 1465 clearAnnotationMetadata(); 1466 } 1467 1468 public void clearAnnotationMetadata() { 1469 metadata = null; 1470 annotationTypeMetadata = AnnotationTypeMetadata.notAnAnnotationType(); 1471 } 1472 1473 @Override 1474 public AnnotationTypeMetadata getAnnotationTypeMetadata() { 1475 return annotationTypeMetadata; 1476 } 1477 1478 @Override 1479 public boolean isAnnotationType() { 1480 return (flags_field & Flags.ANNOTATION) != 0; 1481 } 1482 1483 public void setAnnotationTypeMetadata(AnnotationTypeMetadata a) { 1484 Assert.checkNonNull(a); 1485 Assert.check(!annotationTypeMetadata.isMetadataForAnnotationType()); 1486 this.annotationTypeMetadata = a; 1487 } 1488 } 1489 1490 1491 /** A class for variable symbols 1492 */ 1493 public static class VarSymbol extends Symbol implements VariableElement { 1494 1495 /** The variable's declaration position. 1496 */ 1497 public int pos = Position.NOPOS; 1498 1499 /** The variable's address. Used for different purposes during 1500 * flow analysis, translation and code generation. 1501 * Flow analysis: 1502 * If this is a blank final or local variable, its sequence number. 1503 * Translation: 1504 * If this is a private field, its access number. 1505 * Code generation: 1506 * If this is a local variable, its logical slot number. 1507 */ 1508 public int adr = -1; 1509 1510 /** Construct a variable symbol, given its flags, name, type and owner. 1511 */ 1512 public VarSymbol(long flags, Name name, Type type, Symbol owner) { 1513 super(VAR, flags, name, type, owner); 1514 } 1515 1516 /** Clone this symbol with new owner. 1517 */ 1518 public VarSymbol clone(Symbol newOwner) { 1519 VarSymbol v = new VarSymbol(flags_field, name, type, newOwner) { 1520 @Override 1521 public Symbol baseSymbol() { 1522 return VarSymbol.this; 1523 } 1524 }; 1525 v.pos = pos; 1526 v.adr = adr; 1527 v.data = data; 1528 // System.out.println("clone " + v + " in " + newOwner);//DEBUG 1529 return v; 1530 } 1531 1532 public String toString() { 1533 return name.toString(); 1534 } 1535 1536 public Symbol asMemberOf(Type site, Types types) { 1537 return new VarSymbol(flags_field, name, types.memberType(site, this), owner); 1538 } 1539 1540 @DefinedBy(Api.LANGUAGE_MODEL) 1541 public ElementKind getKind() { 1542 long flags = flags(); 1543 if ((flags & PARAMETER) != 0) { 1544 if (isExceptionParameter()) 1545 return ElementKind.EXCEPTION_PARAMETER; 1546 else 1547 return ElementKind.PARAMETER; 1548 } else if ((flags & ENUM) != 0) { 1549 return ElementKind.ENUM_CONSTANT; 1550 } else if (owner.kind == TYP || owner.kind == ERR) { 1551 return ElementKind.FIELD; 1552 } else if (isResourceVariable()) { 1553 return ElementKind.RESOURCE_VARIABLE; 1554 } else { 1555 return ElementKind.LOCAL_VARIABLE; 1556 } 1557 } 1558 1559 @DefinedBy(Api.LANGUAGE_MODEL) 1560 public <R, P> R accept(ElementVisitor<R, P> v, P p) { 1561 return v.visitVariable(this, p); 1562 } 1563 1564 @DefinedBy(Api.LANGUAGE_MODEL) 1565 public Object getConstantValue() { // Mirror API 1566 return Constants.decode(getConstValue(), type); 1567 } 1568 1569 public void setLazyConstValue(final Env<AttrContext> env, 1570 final Attr attr, 1571 final JCVariableDecl variable) 1572 { 1573 setData((Callable<Object>)() -> attr.attribLazyConstantValue(env, variable, type)); 1574 } 1575 1576 /** 1577 * The variable's constant value, if this is a constant. 1578 * Before the constant value is evaluated, it points to an 1579 * initializer environment. If this is not a constant, it can 1580 * be used for other stuff. 1581 */ 1582 private Object data; 1583 1584 public boolean isExceptionParameter() { 1585 return data == ElementKind.EXCEPTION_PARAMETER; 1586 } 1587 1588 public boolean isResourceVariable() { 1589 return data == ElementKind.RESOURCE_VARIABLE; 1590 } 1591 1592 public Object getConstValue() { 1593 // TODO: Consider if getConstValue and getConstantValue can be collapsed 1594 if (data == ElementKind.EXCEPTION_PARAMETER || 1595 data == ElementKind.RESOURCE_VARIABLE) { 1596 return null; 1597 } else if (data instanceof Callable<?>) { 1598 // In this case, this is a final variable, with an as 1599 // yet unevaluated initializer. 1600 Callable<?> eval = (Callable<?>)data; 1601 data = null; // to make sure we don't evaluate this twice. 1602 try { 1603 data = eval.call(); 1604 } catch (Exception ex) { 1605 throw new AssertionError(ex); 1606 } 1607 } 1608 return data; 1609 } 1610 1611 public void setData(Object data) { 1612 Assert.check(!(data instanceof Env<?>), this); 1613 this.data = data; 1614 } 1615 1616 public <R, P> R accept(Symbol.Visitor<R, P> v, P p) { 1617 return v.visitVarSymbol(this, p); 1618 } 1619 } 1620 1621 /** A class for method symbols. 1622 */ 1623 public static class MethodSymbol extends Symbol implements ExecutableElement { 1624 1625 /** The code of the method. */ 1626 public Code code = null; 1627 1628 /** The extra (synthetic/mandated) parameters of the method. */ 1629 public List<VarSymbol> extraParams = List.nil(); 1630 1631 /** The captured local variables in an anonymous class */ 1632 public List<VarSymbol> capturedLocals = List.nil(); 1633 1634 /** The parameters of the method. */ 1635 public List<VarSymbol> params = null; 1636 1637 /** The names of the parameters */ 1638 public List<Name> savedParameterNames; 1639 1640 /** For an annotation type element, its default value if any. 1641 * The value is null if none appeared in the method 1642 * declaration. 1643 */ 1644 public Attribute defaultValue = null; 1645 1646 /** Construct a method symbol, given its flags, name, type and owner. 1647 */ 1648 public MethodSymbol(long flags, Name name, Type type, Symbol owner) { 1649 super(MTH, flags, name, type, owner); 1650 if (owner.type.hasTag(TYPEVAR)) Assert.error(owner + "." + name); 1651 } 1652 1653 /** Clone this symbol with new owner. 1654 */ 1655 public MethodSymbol clone(Symbol newOwner) { 1656 MethodSymbol m = new MethodSymbol(flags_field, name, type, newOwner) { 1657 @Override 1658 public Symbol baseSymbol() { 1659 return MethodSymbol.this; 1660 } 1661 }; 1662 m.code = code; 1663 return m; 1664 } 1665 1666 @Override @DefinedBy(Api.LANGUAGE_MODEL) 1667 public Set<Modifier> getModifiers() { 1668 long flags = flags(); 1669 return Flags.asModifierSet((flags & DEFAULT) != 0 ? flags & ~ABSTRACT : flags); 1670 } 1671 1672 /** The Java source which this symbol represents. 1673 */ 1674 public String toString() { 1675 if ((flags() & BLOCK) != 0) { 1676 return owner.name.toString(); 1677 } else { 1678 String s = (name == name.table.names.init) 1679 ? owner.name.toString() 1680 : name.toString(); 1681 if (type != null) { 1682 if (type.hasTag(FORALL)) 1683 s = "<" + ((ForAll)type).getTypeArguments() + ">" + s; 1684 s += "(" + type.argtypes((flags() & VARARGS) != 0) + ")"; 1685 } 1686 return s; 1687 } 1688 } 1689 1690 public boolean isDynamic() { 1691 return false; 1692 } 1693 1694 /** find a symbol that this (proxy method) symbol implements. 1695 * @param c The class whose members are searched for 1696 * implementations 1697 */ 1698 public Symbol implemented(TypeSymbol c, Types types) { 1699 Symbol impl = null; 1700 for (List<Type> is = types.interfaces(c.type); 1701 impl == null && is.nonEmpty(); 1702 is = is.tail) { 1703 TypeSymbol i = is.head.tsym; 1704 impl = implementedIn(i, types); 1705 if (impl == null) 1706 impl = implemented(i, types); 1707 } 1708 return impl; 1709 } 1710 1711 public Symbol implementedIn(TypeSymbol c, Types types) { 1712 Symbol impl = null; 1713 for (Symbol sym : c.members().getSymbolsByName(name)) { 1714 if (this.overrides(sym, (TypeSymbol)owner, types, true) && 1715 // FIXME: I suspect the following requires a 1716 // subst() for a parametric return type. 1717 types.isSameType(type.getReturnType(), 1718 types.memberType(owner.type, sym).getReturnType())) { 1719 impl = sym; 1720 } 1721 } 1722 return impl; 1723 } 1724 1725 /** Will the erasure of this method be considered by the VM to 1726 * override the erasure of the other when seen from class `origin'? 1727 */ 1728 public boolean binaryOverrides(Symbol _other, TypeSymbol origin, Types types) { 1729 if (isConstructor() || _other.kind != MTH) return false; 1730 1731 if (this == _other) return true; 1732 MethodSymbol other = (MethodSymbol)_other; 1733 1734 // check for a direct implementation 1735 if (other.isOverridableIn((TypeSymbol)owner) && 1736 types.asSuper(owner.type, other.owner) != null && 1737 types.isSameType(erasure(types), other.erasure(types))) 1738 return true; 1739 1740 // check for an inherited implementation 1741 return 1742 (flags() & ABSTRACT) == 0 && 1743 other.isOverridableIn(origin) && 1744 this.isMemberOf(origin, types) && 1745 types.isSameType(erasure(types), other.erasure(types)); 1746 } 1747 1748 /** The implementation of this (abstract) symbol in class origin, 1749 * from the VM's point of view, null if method does not have an 1750 * implementation in class. 1751 * @param origin The class of which the implementation is a member. 1752 */ 1753 public MethodSymbol binaryImplementation(ClassSymbol origin, Types types) { 1754 for (TypeSymbol c = origin; c != null; c = types.supertype(c.type).tsym) { 1755 for (Symbol sym : c.members().getSymbolsByName(name)) { 1756 if (sym.kind == MTH && 1757 ((MethodSymbol)sym).binaryOverrides(this, origin, types)) 1758 return (MethodSymbol)sym; 1759 } 1760 } 1761 return null; 1762 } 1763 1764 /** Does this symbol override `other' symbol, when both are seen as 1765 * members of class `origin'? It is assumed that _other is a member 1766 * of origin. 1767 * 1768 * It is assumed that both symbols have the same name. The static 1769 * modifier is ignored for this test. 1770 * 1771 * A quirk in the works is that if the receiver is a method symbol for 1772 * an inherited abstract method we answer false summarily all else being 1773 * immaterial. Abstract "own" methods (i.e `this' is a direct member of 1774 * origin) don't get rejected as summarily and are put to test against the 1775 * suitable criteria. 1776 * 1777 * See JLS 8.4.6.1 (without transitivity) and 8.4.6.4 1778 */ 1779 public boolean overrides(Symbol _other, TypeSymbol origin, Types types, boolean checkResult) { 1780 return overrides(_other, origin, types, checkResult, true); 1781 } 1782 1783 /** Does this symbol override `other' symbol, when both are seen as 1784 * members of class `origin'? It is assumed that _other is a member 1785 * of origin. 1786 * 1787 * Caveat: If `this' is an abstract inherited member of origin, it is 1788 * deemed to override `other' only when `requireConcreteIfInherited' 1789 * is false. 1790 * 1791 * It is assumed that both symbols have the same name. The static 1792 * modifier is ignored for this test. 1793 * 1794 * See JLS 8.4.6.1 (without transitivity) and 8.4.6.4 1795 */ 1796 public boolean overrides(Symbol _other, TypeSymbol origin, Types types, boolean checkResult, 1797 boolean requireConcreteIfInherited) { 1798 if (isConstructor() || _other.kind != MTH) return false; 1799 1800 if (this == _other) return true; 1801 MethodSymbol other = (MethodSymbol)_other; 1802 1803 // check for a direct implementation 1804 if (other.isOverridableIn((TypeSymbol)owner) && 1805 types.asSuper(owner.type, other.owner) != null) { 1806 Type mt = types.memberType(owner.type, this); 1807 Type ot = types.memberType(owner.type, other); 1808 if (types.isSubSignature(mt, ot)) { 1809 if (!checkResult) 1810 return true; 1811 if (types.returnTypeSubstitutable(mt, ot)) 1812 return true; 1813 } 1814 } 1815 1816 // check for an inherited implementation 1817 if (((flags() & ABSTRACT) != 0 && requireConcreteIfInherited) || 1818 ((other.flags() & ABSTRACT) == 0 && (other.flags() & DEFAULT) == 0) || 1819 !other.isOverridableIn(origin) || 1820 !this.isMemberOf(origin, types)) 1821 return false; 1822 1823 // assert types.asSuper(origin.type, other.owner) != null; 1824 Type mt = types.memberType(origin.type, this); 1825 Type ot = types.memberType(origin.type, other); 1826 return 1827 types.isSubSignature(mt, ot) && 1828 (!checkResult || types.resultSubtype(mt, ot, types.noWarnings)); 1829 } 1830 1831 private boolean isOverridableIn(TypeSymbol origin) { 1832 // JLS 8.4.6.1 1833 switch ((int)(flags_field & Flags.AccessFlags)) { 1834 case Flags.PRIVATE: 1835 return false; 1836 case Flags.PUBLIC: 1837 return !this.owner.isInterface() || 1838 (flags_field & STATIC) == 0; 1839 case Flags.PROTECTED: 1840 return (origin.flags() & INTERFACE) == 0; 1841 case 0: 1842 // for package private: can only override in the same 1843 // package 1844 return 1845 this.packge() == origin.packge() && 1846 (origin.flags() & INTERFACE) == 0; 1847 default: 1848 return false; 1849 } 1850 } 1851 1852 @Override 1853 public boolean isInheritedIn(Symbol clazz, Types types) { 1854 switch ((int)(flags_field & Flags.AccessFlags)) { 1855 case PUBLIC: 1856 return !this.owner.isInterface() || 1857 clazz == owner || 1858 (flags_field & STATIC) == 0; 1859 default: 1860 return super.isInheritedIn(clazz, types); 1861 } 1862 } 1863 1864 public boolean isLambdaMethod() { 1865 return (flags() & LAMBDA_METHOD) == LAMBDA_METHOD; 1866 } 1867 1868 /** The implementation of this (abstract) symbol in class origin; 1869 * null if none exists. Synthetic methods are not considered 1870 * as possible implementations. 1871 */ 1872 public MethodSymbol implementation(TypeSymbol origin, Types types, boolean checkResult) { 1873 return implementation(origin, types, checkResult, implementation_filter); 1874 } 1875 // where 1876 public static final Filter<Symbol> implementation_filter = s -> 1877 s.kind == MTH && (s.flags() & SYNTHETIC) == 0; 1878 1879 public MethodSymbol implementation(TypeSymbol origin, Types types, boolean checkResult, Filter<Symbol> implFilter) { 1880 MethodSymbol res = types.implementation(this, origin, checkResult, implFilter); 1881 if (res != null) 1882 return res; 1883 // if origin is derived from a raw type, we might have missed 1884 // an implementation because we do not know enough about instantiations. 1885 // in this case continue with the supertype as origin. 1886 if (types.isDerivedRaw(origin.type) && !origin.isInterface()) 1887 return implementation(types.supertype(origin.type).tsym, types, checkResult); 1888 else 1889 return null; 1890 } 1891 1892 public List<VarSymbol> params() { 1893 owner.complete(); 1894 if (params == null) { 1895 // If ClassReader.saveParameterNames has been set true, then 1896 // savedParameterNames will be set to a list of names that 1897 // matches the types in type.getParameterTypes(). If any names 1898 // were not found in the class file, those names in the list will 1899 // be set to the empty name. 1900 // If ClassReader.saveParameterNames has been set false, then 1901 // savedParameterNames will be null. 1902 List<Name> paramNames = savedParameterNames; 1903 savedParameterNames = null; 1904 // discard the provided names if the list of names is the wrong size. 1905 if (paramNames == null || paramNames.size() != type.getParameterTypes().size()) { 1906 paramNames = List.nil(); 1907 } 1908 ListBuffer<VarSymbol> buf = new ListBuffer<>(); 1909 List<Name> remaining = paramNames; 1910 // assert: remaining and paramNames are both empty or both 1911 // have same cardinality as type.getParameterTypes() 1912 int i = 0; 1913 for (Type t : type.getParameterTypes()) { 1914 Name paramName; 1915 if (remaining.isEmpty()) { 1916 // no names for any parameters available 1917 paramName = createArgName(i, paramNames); 1918 } else { 1919 paramName = remaining.head; 1920 remaining = remaining.tail; 1921 if (paramName.isEmpty()) { 1922 // no name for this specific parameter 1923 paramName = createArgName(i, paramNames); 1924 } 1925 } 1926 buf.append(new VarSymbol(PARAMETER, paramName, t, this)); 1927 i++; 1928 } 1929 params = buf.toList(); 1930 } 1931 return params; 1932 } 1933 1934 // Create a name for the argument at position 'index' that is not in 1935 // the exclude list. In normal use, either no names will have been 1936 // provided, in which case the exclude list is empty, or all the names 1937 // will have been provided, in which case this method will not be called. 1938 private Name createArgName(int index, List<Name> exclude) { 1939 String prefix = "arg"; 1940 while (true) { 1941 Name argName = name.table.fromString(prefix + index); 1942 if (!exclude.contains(argName)) 1943 return argName; 1944 prefix += "$"; 1945 } 1946 } 1947 1948 public Symbol asMemberOf(Type site, Types types) { 1949 return new MethodSymbol(flags_field, name, types.memberType(site, this), owner); 1950 } 1951 1952 @DefinedBy(Api.LANGUAGE_MODEL) 1953 public ElementKind getKind() { 1954 if (name == name.table.names.init) 1955 return ElementKind.CONSTRUCTOR; 1956 else if (name == name.table.names.clinit) 1957 return ElementKind.STATIC_INIT; 1958 else if ((flags() & BLOCK) != 0) 1959 return isStatic() ? ElementKind.STATIC_INIT : ElementKind.INSTANCE_INIT; 1960 else 1961 return ElementKind.METHOD; 1962 } 1963 1964 public boolean isStaticOrInstanceInit() { 1965 return getKind() == ElementKind.STATIC_INIT || 1966 getKind() == ElementKind.INSTANCE_INIT; 1967 } 1968 1969 @DefinedBy(Api.LANGUAGE_MODEL) 1970 public Attribute getDefaultValue() { 1971 return defaultValue; 1972 } 1973 1974 @DefinedBy(Api.LANGUAGE_MODEL) 1975 public List<VarSymbol> getParameters() { 1976 return params(); 1977 } 1978 1979 @DefinedBy(Api.LANGUAGE_MODEL) 1980 public boolean isVarArgs() { 1981 return (flags() & VARARGS) != 0; 1982 } 1983 1984 @DefinedBy(Api.LANGUAGE_MODEL) 1985 public boolean isDefault() { 1986 return (flags() & DEFAULT) != 0; 1987 } 1988 1989 @DefinedBy(Api.LANGUAGE_MODEL) 1990 public <R, P> R accept(ElementVisitor<R, P> v, P p) { 1991 return v.visitExecutable(this, p); 1992 } 1993 1994 public <R, P> R accept(Symbol.Visitor<R, P> v, P p) { 1995 return v.visitMethodSymbol(this, p); 1996 } 1997 1998 @DefinedBy(Api.LANGUAGE_MODEL) 1999 public Type getReceiverType() { 2000 return asType().getReceiverType(); 2001 } 2002 2003 @DefinedBy(Api.LANGUAGE_MODEL) 2004 public Type getReturnType() { 2005 return asType().getReturnType(); 2006 } 2007 2008 @DefinedBy(Api.LANGUAGE_MODEL) 2009 public List<Type> getThrownTypes() { 2010 return asType().getThrownTypes(); 2011 } 2012 } 2013 2014 /** A class for invokedynamic method calls. 2015 */ 2016 public static class DynamicMethodSymbol extends MethodSymbol { 2017 2018 public Object[] staticArgs; 2019 public Symbol bsm; 2020 public int bsmKind; 2021 2022 public DynamicMethodSymbol(Name name, Symbol owner, int bsmKind, MethodSymbol bsm, Type type, Object[] staticArgs) { 2023 super(0, name, type, owner); 2024 this.bsm = bsm; 2025 this.bsmKind = bsmKind; 2026 this.staticArgs = staticArgs; 2027 } 2028 2029 @Override 2030 public boolean isDynamic() { 2031 return true; 2032 } 2033 } 2034 2035 /** A class for predefined operators. 2036 */ 2037 public static class OperatorSymbol extends MethodSymbol { 2038 2039 public int opcode; 2040 private int accessCode = Integer.MIN_VALUE; 2041 2042 public OperatorSymbol(Name name, Type type, int opcode, Symbol owner) { 2043 super(PUBLIC | STATIC, name, type, owner); 2044 this.opcode = opcode; 2045 } 2046 2047 @Override 2048 public <R, P> R accept(Symbol.Visitor<R, P> v, P p) { 2049 return v.visitOperatorSymbol(this, p); 2050 } 2051 2052 public int getAccessCode(Tag tag) { 2053 if (accessCode != Integer.MIN_VALUE && !tag.isIncOrDecUnaryOp()) { 2054 return accessCode; 2055 } 2056 accessCode = AccessCode.from(tag, opcode); 2057 return accessCode; 2058 } 2059 2060 /** Access codes for dereferencing, assignment, 2061 * and pre/post increment/decrement. 2062 2063 * All access codes for accesses to the current class are even. 2064 * If a member of the superclass should be accessed instead (because 2065 * access was via a qualified super), add one to the corresponding code 2066 * for the current class, making the number odd. 2067 * This numbering scheme is used by the backend to decide whether 2068 * to issue an invokevirtual or invokespecial call. 2069 * 2070 * @see Gen#visitSelect(JCFieldAccess tree) 2071 */ 2072 public enum AccessCode { 2073 UNKNOWN(-1, Tag.NO_TAG), 2074 DEREF(0, Tag.NO_TAG), 2075 ASSIGN(2, Tag.ASSIGN), 2076 PREINC(4, Tag.PREINC), 2077 PREDEC(6, Tag.PREDEC), 2078 POSTINC(8, Tag.POSTINC), 2079 POSTDEC(10, Tag.POSTDEC), 2080 FIRSTASGOP(12, Tag.NO_TAG); 2081 2082 public final int code; 2083 public final Tag tag; 2084 public static final int numberOfAccessCodes = (lushrl - ishll + lxor + 2 - iadd) * 2 + FIRSTASGOP.code + 2; 2085 2086 AccessCode(int code, Tag tag) { 2087 this.code = code; 2088 this.tag = tag; 2089 } 2090 2091 static public AccessCode getFromCode(int code) { 2092 for (AccessCode aCodes : AccessCode.values()) { 2093 if (aCodes.code == code) { 2094 return aCodes; 2095 } 2096 } 2097 return UNKNOWN; 2098 } 2099 2100 static int from(Tag tag, int opcode) { 2101 /** Map bytecode of binary operation to access code of corresponding 2102 * assignment operation. This is always an even number. 2103 */ 2104 switch (tag) { 2105 case PREINC: 2106 return AccessCode.PREINC.code; 2107 case PREDEC: 2108 return AccessCode.PREDEC.code; 2109 case POSTINC: 2110 return AccessCode.POSTINC.code; 2111 case POSTDEC: 2112 return AccessCode.POSTDEC.code; 2113 } 2114 if (iadd <= opcode && opcode <= lxor) { 2115 return (opcode - iadd) * 2 + FIRSTASGOP.code; 2116 } else if (opcode == string_add) { 2117 return (lxor + 1 - iadd) * 2 + FIRSTASGOP.code; 2118 } else if (ishll <= opcode && opcode <= lushrl) { 2119 return (opcode - ishll + lxor + 2 - iadd) * 2 + FIRSTASGOP.code; 2120 } 2121 return -1; 2122 } 2123 } 2124 } 2125 2126 /** Symbol completer interface. 2127 */ 2128 public static interface Completer { 2129 2130 /** Dummy completer to be used when the symbol has been completed or 2131 * does not need completion. 2132 */ 2133 public final static Completer NULL_COMPLETER = new Completer() { 2134 public void complete(Symbol sym) { } 2135 public boolean isTerminal() { return true; } 2136 }; 2137 2138 void complete(Symbol sym) throws CompletionFailure; 2139 2140 /** Returns true if this completer is <em>terminal</em>. A terminal 2141 * completer is used as a place holder when the symbol is completed. 2142 * Calling complete on a terminal completer will not affect the symbol. 2143 * 2144 * The dummy NULL_COMPLETER and the GraphDependencies completer are 2145 * examples of terminal completers. 2146 * 2147 * @return true iff this completer is terminal 2148 */ 2149 default boolean isTerminal() { 2150 return false; 2151 } 2152 } 2153 2154 public static class CompletionFailure extends RuntimeException { 2155 private static final long serialVersionUID = 0; 2156 public Symbol sym; 2157 2158 /** A diagnostic object describing the failure 2159 */ 2160 public JCDiagnostic diag; 2161 2162 /** A localized string describing the failure. 2163 * @deprecated Use {@code getDetail()} or {@code getMessage()} 2164 */ 2165 @Deprecated 2166 public String errmsg; 2167 2168 public CompletionFailure(Symbol sym, String errmsg) { 2169 this.sym = sym; 2170 this.errmsg = errmsg; 2171 // this.printStackTrace();//DEBUG 2172 } 2173 2174 public CompletionFailure(Symbol sym, JCDiagnostic diag) { 2175 this.sym = sym; 2176 this.diag = diag; 2177 // this.printStackTrace();//DEBUG 2178 } 2179 2180 public JCDiagnostic getDiagnostic() { 2181 return diag; 2182 } 2183 2184 @Override 2185 public String getMessage() { 2186 if (diag != null) 2187 return diag.getMessage(null); 2188 else 2189 return errmsg; 2190 } 2191 2192 public Object getDetailValue() { 2193 return (diag != null ? diag : errmsg); 2194 } 2195 2196 @Override 2197 public CompletionFailure initCause(Throwable cause) { 2198 super.initCause(cause); 2199 return this; 2200 } 2201 2202 } 2203 2204 /** 2205 * A visitor for symbols. A visitor is used to implement operations 2206 * (or relations) on symbols. Most common operations on types are 2207 * binary relations and this interface is designed for binary 2208 * relations, that is, operations on the form 2209 * Symbol × P → R. 2210 * <!-- In plain text: Type x P -> R --> 2211 * 2212 * @param <R> the return type of the operation implemented by this 2213 * visitor; use Void if no return type is needed. 2214 * @param <P> the type of the second argument (the first being the 2215 * symbol itself) of the operation implemented by this visitor; use 2216 * Void if a second argument is not needed. 2217 */ 2218 public interface Visitor<R,P> { 2219 R visitClassSymbol(ClassSymbol s, P arg); 2220 R visitMethodSymbol(MethodSymbol s, P arg); 2221 R visitPackageSymbol(PackageSymbol s, P arg); 2222 R visitOperatorSymbol(OperatorSymbol s, P arg); 2223 R visitVarSymbol(VarSymbol s, P arg); 2224 R visitTypeSymbol(TypeSymbol s, P arg); 2225 R visitSymbol(Symbol s, P arg); 2226 } 2227 }