Type.java revision 4038:95c92c634f60
1/* 2 * Copyright (c) 1999, 2016, 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 26package com.sun.tools.javac.code; 27 28import java.lang.annotation.Annotation; 29import java.util.ArrayDeque; 30import java.util.Collections; 31import java.util.EnumMap; 32import java.util.Map; 33 34import javax.lang.model.type.*; 35 36import com.sun.tools.javac.code.Symbol.*; 37import com.sun.tools.javac.code.TypeMetadata.Entry; 38import com.sun.tools.javac.code.Types.TypeMapping; 39import com.sun.tools.javac.comp.Infer.IncorporationAction; 40import com.sun.tools.javac.util.*; 41import com.sun.tools.javac.util.DefinedBy.Api; 42 43import static com.sun.tools.javac.code.BoundKind.*; 44import static com.sun.tools.javac.code.Flags.*; 45import static com.sun.tools.javac.code.Kinds.Kind.*; 46import static com.sun.tools.javac.code.TypeTag.*; 47 48/** This class represents Java types. The class itself defines the behavior of 49 * the following types: 50 * <pre> 51 * base types (tags: BYTE, CHAR, SHORT, INT, LONG, FLOAT, DOUBLE, BOOLEAN), 52 * type `void' (tag: VOID), 53 * the bottom type (tag: BOT), 54 * the missing type (tag: NONE). 55 * </pre> 56 * <p>The behavior of the following types is defined in subclasses, which are 57 * all static inner classes of this class: 58 * <pre> 59 * class types (tag: CLASS, class: ClassType), 60 * array types (tag: ARRAY, class: ArrayType), 61 * method types (tag: METHOD, class: MethodType), 62 * package types (tag: PACKAGE, class: PackageType), 63 * type variables (tag: TYPEVAR, class: TypeVar), 64 * type arguments (tag: WILDCARD, class: WildcardType), 65 * generic method types (tag: FORALL, class: ForAll), 66 * the error type (tag: ERROR, class: ErrorType). 67 * </pre> 68 * 69 * <p><b>This is NOT part of any supported API. 70 * If you write code that depends on this, you do so at your own risk. 71 * This code and its internal interfaces are subject to change or 72 * deletion without notice.</b> 73 * 74 * @see TypeTag 75 */ 76public abstract class Type extends AnnoConstruct implements TypeMirror { 77 78 /** 79 * Type metadata, Should be {@code null} for the default value. 80 * 81 * Note: it is an invariant that for any {@code TypeMetadata} 82 * class, a given {@code Type} may have at most one metadata array 83 * entry of that class. 84 */ 85 protected final TypeMetadata metadata; 86 87 public TypeMetadata getMetadata() { 88 return metadata; 89 } 90 91 public Entry getMetadataOfKind(final Entry.Kind kind) { 92 return metadata != null ? metadata.get(kind) : null; 93 } 94 95 /** Constant type: no type at all. */ 96 public static final JCNoType noType = new JCNoType() { 97 @Override @DefinedBy(Api.LANGUAGE_MODEL) 98 public String toString() { 99 return "none"; 100 } 101 }; 102 103 /** Constant type: special type to be used during recovery of deferred expressions. */ 104 public static final JCNoType recoveryType = new JCNoType(){ 105 @Override @DefinedBy(Api.LANGUAGE_MODEL) 106 public String toString() { 107 return "recovery"; 108 } 109 }; 110 111 /** Constant type: special type to be used for marking stuck trees. */ 112 public static final JCNoType stuckType = new JCNoType() { 113 @Override @DefinedBy(Api.LANGUAGE_MODEL) 114 public String toString() { 115 return "stuck"; 116 } 117 }; 118 119 /** If this switch is turned on, the names of type variables 120 * and anonymous classes are printed with hashcodes appended. 121 */ 122 public static boolean moreInfo = false; 123 124 /** The defining class / interface / package / type variable. 125 */ 126 public TypeSymbol tsym; 127 128 /** 129 * Checks if the current type tag is equal to the given tag. 130 * @return true if tag is equal to the current type tag. 131 */ 132 public boolean hasTag(TypeTag tag) { 133 return tag == getTag(); 134 } 135 136 /** 137 * Returns the current type tag. 138 * @return the value of the current type tag. 139 */ 140 public abstract TypeTag getTag(); 141 142 public boolean isNumeric() { 143 return false; 144 } 145 146 public boolean isIntegral() { 147 return false; 148 } 149 150 public boolean isPrimitive() { 151 return false; 152 } 153 154 public boolean isPrimitiveOrVoid() { 155 return false; 156 } 157 158 public boolean isReference() { 159 return false; 160 } 161 162 public boolean isNullOrReference() { 163 return false; 164 } 165 166 public boolean isPartial() { 167 return false; 168 } 169 170 /** 171 * The constant value of this type, null if this type does not 172 * have a constant value attribute. Only primitive types and 173 * strings (ClassType) can have a constant value attribute. 174 * @return the constant value attribute of this type 175 */ 176 public Object constValue() { 177 return null; 178 } 179 180 /** Is this a constant type whose value is false? 181 */ 182 public boolean isFalse() { 183 return false; 184 } 185 186 /** Is this a constant type whose value is true? 187 */ 188 public boolean isTrue() { 189 return false; 190 } 191 192 /** 193 * Get the representation of this type used for modelling purposes. 194 * By default, this is itself. For ErrorType, a different value 195 * may be provided. 196 */ 197 public Type getModelType() { 198 return this; 199 } 200 201 public static List<Type> getModelTypes(List<Type> ts) { 202 ListBuffer<Type> lb = new ListBuffer<>(); 203 for (Type t: ts) 204 lb.append(t.getModelType()); 205 return lb.toList(); 206 } 207 208 /**For ErrorType, returns the original type, otherwise returns the type itself. 209 */ 210 public Type getOriginalType() { 211 return this; 212 } 213 214 public <R,S> R accept(Type.Visitor<R,S> v, S s) { return v.visitType(this, s); } 215 216 /** Define a type given its tag, type symbol, and type annotations 217 */ 218 219 public Type(TypeSymbol tsym, TypeMetadata metadata) { 220 Assert.checkNonNull(metadata); 221 this.tsym = tsym; 222 this.metadata = metadata; 223 } 224 225 /** 226 * A subclass of {@link Types.TypeMapping} which applies a mapping recursively to the subterms 227 * of a given type expression. This mapping returns the original type is no changes occurred 228 * when recursively mapping the original type's subterms. 229 */ 230 public static abstract class StructuralTypeMapping<S> extends Types.TypeMapping<S> { 231 232 @Override 233 public Type visitClassType(ClassType t, S s) { 234 Type outer = t.getEnclosingType(); 235 Type outer1 = visit(outer, s); 236 List<Type> typarams = t.getTypeArguments(); 237 List<Type> typarams1 = visit(typarams, s); 238 if (outer1 == outer && typarams1 == typarams) return t; 239 else return new ClassType(outer1, typarams1, t.tsym, t.metadata) { 240 @Override 241 protected boolean needsStripping() { 242 return true; 243 } 244 }; 245 } 246 247 @Override 248 public Type visitWildcardType(WildcardType wt, S s) { 249 Type t = wt.type; 250 if (t != null) 251 t = visit(t, s); 252 if (t == wt.type) 253 return wt; 254 else 255 return new WildcardType(t, wt.kind, wt.tsym, wt.bound, wt.metadata) { 256 @Override 257 protected boolean needsStripping() { 258 return true; 259 } 260 }; 261 } 262 263 @Override 264 public Type visitArrayType(ArrayType t, S s) { 265 Type elemtype = t.elemtype; 266 Type elemtype1 = visit(elemtype, s); 267 if (elemtype1 == elemtype) return t; 268 else return new ArrayType(elemtype1, t.tsym, t.metadata) { 269 @Override 270 protected boolean needsStripping() { 271 return true; 272 } 273 }; 274 } 275 276 @Override 277 public Type visitMethodType(MethodType t, S s) { 278 List<Type> argtypes = t.argtypes; 279 Type restype = t.restype; 280 List<Type> thrown = t.thrown; 281 List<Type> argtypes1 = visit(argtypes, s); 282 Type restype1 = visit(restype, s); 283 List<Type> thrown1 = visit(thrown, s); 284 if (argtypes1 == argtypes && 285 restype1 == restype && 286 thrown1 == thrown) return t; 287 else return new MethodType(argtypes1, restype1, thrown1, t.tsym) { 288 @Override 289 protected boolean needsStripping() { 290 return true; 291 } 292 }; 293 } 294 295 @Override 296 public Type visitForAll(ForAll t, S s) { 297 return visit(t.qtype, s); 298 } 299 } 300 301 /** map a type function over all immediate descendants of this type 302 */ 303 public <Z> Type map(TypeMapping<Z> mapping, Z arg) { 304 return mapping.visit(this, arg); 305 } 306 307 /** map a type function over all immediate descendants of this type (no arg version) 308 */ 309 public <Z> Type map(TypeMapping<Z> mapping) { 310 return mapping.visit(this, null); 311 } 312 313 /** Define a constant type, of the same kind as this type 314 * and with given constant value 315 */ 316 public Type constType(Object constValue) { 317 throw new AssertionError(); 318 } 319 320 /** 321 * If this is a constant type, return its underlying type. 322 * Otherwise, return the type itself. 323 */ 324 public Type baseType() { 325 return this; 326 } 327 328 /** 329 * Returns the original version of this type, before metadata were added. This routine is meant 330 * for internal use only (i.e. {@link Type#equalsIgnoreMetadata(Type)}, {@link Type#stripMetadata}); 331 * it should not be used outside this class. 332 */ 333 protected Type typeNoMetadata() { 334 return metadata == TypeMetadata.EMPTY ? this : baseType(); 335 } 336 337 /** 338 * Create a new copy of this type but with the specified TypeMetadata. 339 */ 340 public abstract Type cloneWithMetadata(TypeMetadata metadata); 341 342 /** 343 * Does this type require annotation stripping for API clients? 344 */ 345 protected boolean needsStripping() { 346 return false; 347 } 348 349 /** 350 * Strip all metadata associated with this type - this could return a new clone of the type. 351 * This routine is only used to present the correct annotated types back to the users when types 352 * are accessed through compiler APIs; it should not be used anywhere in the compiler internals 353 * as doing so might result in performance penalties. 354 */ 355 public Type stripMetadataIfNeeded() { 356 return needsStripping() ? 357 accept(stripMetadata, null) : 358 this; 359 } 360 361 public Type stripMetadata() { 362 return accept(stripMetadata, null); 363 } 364 //where 365 private final static TypeMapping<Void> stripMetadata = new StructuralTypeMapping<Void>() { 366 @Override 367 public Type visitClassType(ClassType t, Void aVoid) { 368 return super.visitClassType((ClassType)t.typeNoMetadata(), aVoid); 369 } 370 371 @Override 372 public Type visitArrayType(ArrayType t, Void aVoid) { 373 return super.visitArrayType((ArrayType)t.typeNoMetadata(), aVoid); 374 } 375 376 @Override 377 public Type visitTypeVar(TypeVar t, Void aVoid) { 378 return super.visitTypeVar((TypeVar)t.typeNoMetadata(), aVoid); 379 } 380 381 @Override 382 public Type visitWildcardType(WildcardType wt, Void aVoid) { 383 return super.visitWildcardType((WildcardType)wt.typeNoMetadata(), aVoid); 384 } 385 }; 386 387 public Type annotatedType(final List<Attribute.TypeCompound> annos) { 388 final Entry annoMetadata = new TypeMetadata.Annotations(annos); 389 return cloneWithMetadata(metadata.combine(annoMetadata)); 390 } 391 392 public boolean isAnnotated() { 393 final TypeMetadata.Annotations metadata = 394 (TypeMetadata.Annotations)getMetadataOfKind(Entry.Kind.ANNOTATIONS); 395 396 return null != metadata && !metadata.getAnnotations().isEmpty(); 397 } 398 399 @Override @DefinedBy(Api.LANGUAGE_MODEL) 400 public List<Attribute.TypeCompound> getAnnotationMirrors() { 401 final TypeMetadata.Annotations metadata = 402 (TypeMetadata.Annotations)getMetadataOfKind(Entry.Kind.ANNOTATIONS); 403 404 return metadata == null ? List.nil() : metadata.getAnnotations(); 405 } 406 407 408 @Override @DefinedBy(Api.LANGUAGE_MODEL) 409 public <A extends Annotation> A getAnnotation(Class<A> annotationType) { 410 return null; 411 } 412 413 414 @Override @DefinedBy(Api.LANGUAGE_MODEL) 415 public <A extends Annotation> A[] getAnnotationsByType(Class<A> annotationType) { 416 @SuppressWarnings("unchecked") 417 A[] tmp = (A[]) java.lang.reflect.Array.newInstance(annotationType, 0); 418 return tmp; 419 } 420 421 /** Return the base types of a list of types. 422 */ 423 public static List<Type> baseTypes(List<Type> ts) { 424 if (ts.nonEmpty()) { 425 Type t = ts.head.baseType(); 426 List<Type> baseTypes = baseTypes(ts.tail); 427 if (t != ts.head || baseTypes != ts.tail) 428 return baseTypes.prepend(t); 429 } 430 return ts; 431 } 432 433 protected void appendAnnotationsString(StringBuilder sb, 434 boolean prefix) { 435 if (isAnnotated()) { 436 if (prefix) { 437 sb.append(" "); 438 } 439 sb.append(getAnnotationMirrors()); 440 sb.append(" "); 441 } 442 } 443 444 protected void appendAnnotationsString(StringBuilder sb) { 445 appendAnnotationsString(sb, false); 446 } 447 448 /** The Java source which this type represents. 449 */ 450 @DefinedBy(Api.LANGUAGE_MODEL) 451 public String toString() { 452 StringBuilder sb = new StringBuilder(); 453 appendAnnotationsString(sb); 454 if (tsym == null || tsym.name == null) { 455 sb.append("<none>"); 456 } else { 457 sb.append(tsym.name); 458 } 459 if (moreInfo && hasTag(TYPEVAR)) { 460 sb.append(hashCode()); 461 } 462 return sb.toString(); 463 } 464 465 /** 466 * The Java source which this type list represents. A List is 467 * represented as a comma-spearated listing of the elements in 468 * that list. 469 */ 470 public static String toString(List<Type> ts) { 471 if (ts.isEmpty()) { 472 return ""; 473 } else { 474 StringBuilder buf = new StringBuilder(); 475 buf.append(ts.head.toString()); 476 for (List<Type> l = ts.tail; l.nonEmpty(); l = l.tail) 477 buf.append(",").append(l.head.toString()); 478 return buf.toString(); 479 } 480 } 481 482 /** 483 * The constant value of this type, converted to String 484 */ 485 public String stringValue() { 486 Object cv = Assert.checkNonNull(constValue()); 487 return cv.toString(); 488 } 489 490 /** 491 * Override this method with care. For most Type instances this should behave as ==. 492 */ 493 @Override @DefinedBy(Api.LANGUAGE_MODEL) 494 public boolean equals(Object t) { 495 return this == t; 496 } 497 498 public boolean equalsIgnoreMetadata(Type t) { 499 return typeNoMetadata().equals(t.typeNoMetadata()); 500 } 501 502 @Override @DefinedBy(Api.LANGUAGE_MODEL) 503 public int hashCode() { 504 return super.hashCode(); 505 } 506 507 public String argtypes(boolean varargs) { 508 List<Type> args = getParameterTypes(); 509 if (!varargs) return args.toString(); 510 StringBuilder buf = new StringBuilder(); 511 while (args.tail.nonEmpty()) { 512 buf.append(args.head); 513 args = args.tail; 514 buf.append(','); 515 } 516 if (args.head.hasTag(ARRAY)) { 517 buf.append(((ArrayType)args.head).elemtype); 518 if (args.head.getAnnotationMirrors().nonEmpty()) { 519 buf.append(args.head.getAnnotationMirrors()); 520 } 521 buf.append("..."); 522 } else { 523 buf.append(args.head); 524 } 525 return buf.toString(); 526 } 527 528 /** Access methods. 529 */ 530 public List<Type> getTypeArguments() { return List.nil(); } 531 public Type getEnclosingType() { return null; } 532 public List<Type> getParameterTypes() { return List.nil(); } 533 public Type getReturnType() { return null; } 534 public Type getReceiverType() { return null; } 535 public List<Type> getThrownTypes() { return List.nil(); } 536 public Type getUpperBound() { return null; } 537 public Type getLowerBound() { return null; } 538 539 /** Navigation methods, these will work for classes, type variables, 540 * foralls, but will return null for arrays and methods. 541 */ 542 543 /** Return all parameters of this type and all its outer types in order 544 * outer (first) to inner (last). 545 */ 546 public List<Type> allparams() { return List.nil(); } 547 548 /** Does this type contain "error" elements? 549 */ 550 public boolean isErroneous() { 551 return false; 552 } 553 554 public static boolean isErroneous(List<Type> ts) { 555 for (List<Type> l = ts; l.nonEmpty(); l = l.tail) 556 if (l.head.isErroneous()) return true; 557 return false; 558 } 559 560 /** Is this type parameterized? 561 * A class type is parameterized if it has some parameters. 562 * An array type is parameterized if its element type is parameterized. 563 * All other types are not parameterized. 564 */ 565 public boolean isParameterized() { 566 return false; 567 } 568 569 /** Is this type a raw type? 570 * A class type is a raw type if it misses some of its parameters. 571 * An array type is a raw type if its element type is raw. 572 * All other types are not raw. 573 * Type validation will ensure that the only raw types 574 * in a program are types that miss all their type variables. 575 */ 576 public boolean isRaw() { 577 return false; 578 } 579 580 /** 581 * A compound type is a special class type whose supertypes are used to store a list 582 * of component types. There are two kinds of compound types: (i) intersection types 583 * {@see IntersectionClassType} and (ii) union types {@see UnionClassType}. 584 */ 585 public boolean isCompound() { 586 return false; 587 } 588 589 public boolean isIntersection() { 590 return false; 591 } 592 593 public boolean isUnion() { 594 return false; 595 } 596 597 public boolean isInterface() { 598 return (tsym.flags() & INTERFACE) != 0; 599 } 600 601 public boolean isFinal() { 602 return (tsym.flags() & FINAL) != 0; 603 } 604 605 /** 606 * Does this type contain occurrences of type t? 607 */ 608 public boolean contains(Type t) { 609 return t.equalsIgnoreMetadata(this); 610 } 611 612 public static boolean contains(List<Type> ts, Type t) { 613 for (List<Type> l = ts; 614 l.tail != null /*inlined: l.nonEmpty()*/; 615 l = l.tail) 616 if (l.head.contains(t)) return true; 617 return false; 618 } 619 620 /** Does this type contain an occurrence of some type in 'ts'? 621 */ 622 public boolean containsAny(List<Type> ts) { 623 for (Type t : ts) 624 if (this.contains(t)) return true; 625 return false; 626 } 627 628 public static boolean containsAny(List<Type> ts1, List<Type> ts2) { 629 for (Type t : ts1) 630 if (t.containsAny(ts2)) return true; 631 return false; 632 } 633 634 public static List<Type> filter(List<Type> ts, Filter<Type> tf) { 635 ListBuffer<Type> buf = new ListBuffer<>(); 636 for (Type t : ts) { 637 if (tf.accepts(t)) { 638 buf.append(t); 639 } 640 } 641 return buf.toList(); 642 } 643 644 public boolean isSuperBound() { return false; } 645 public boolean isExtendsBound() { return false; } 646 public boolean isUnbound() { return false; } 647 public Type withTypeVar(Type t) { return this; } 648 649 /** The underlying method type of this type. 650 */ 651 public MethodType asMethodType() { throw new AssertionError(); } 652 653 /** Complete loading all classes in this type. 654 */ 655 public void complete() {} 656 657 public TypeSymbol asElement() { 658 return tsym; 659 } 660 661 @Override @DefinedBy(Api.LANGUAGE_MODEL) 662 public TypeKind getKind() { 663 return TypeKind.OTHER; 664 } 665 666 @Override @DefinedBy(Api.LANGUAGE_MODEL) 667 public <R, P> R accept(TypeVisitor<R, P> v, P p) { 668 throw new AssertionError(); 669 } 670 671 public static class JCPrimitiveType extends Type 672 implements javax.lang.model.type.PrimitiveType { 673 674 TypeTag tag; 675 676 public JCPrimitiveType(TypeTag tag, TypeSymbol tsym) { 677 this(tag, tsym, TypeMetadata.EMPTY); 678 } 679 680 private JCPrimitiveType(TypeTag tag, TypeSymbol tsym, TypeMetadata metadata) { 681 super(tsym, metadata); 682 this.tag = tag; 683 Assert.check(tag.isPrimitive); 684 } 685 686 @Override 687 public JCPrimitiveType cloneWithMetadata(TypeMetadata md) { 688 return new JCPrimitiveType(tag, tsym, md) { 689 @Override 690 public Type baseType() { return JCPrimitiveType.this.baseType(); } 691 }; 692 } 693 694 @Override 695 public boolean isNumeric() { 696 return tag != BOOLEAN; 697 } 698 699 @Override 700 public boolean isIntegral() { 701 switch (tag) { 702 case CHAR: 703 case BYTE: 704 case SHORT: 705 case INT: 706 case LONG: 707 return true; 708 default: 709 return false; 710 } 711 } 712 713 @Override 714 public boolean isPrimitive() { 715 return true; 716 } 717 718 @Override 719 public TypeTag getTag() { 720 return tag; 721 } 722 723 @Override 724 public boolean isPrimitiveOrVoid() { 725 return true; 726 } 727 728 /** Define a constant type, of the same kind as this type 729 * and with given constant value 730 */ 731 @Override 732 public Type constType(Object constValue) { 733 final Object value = constValue; 734 return new JCPrimitiveType(tag, tsym, metadata) { 735 @Override 736 public Object constValue() { 737 return value; 738 } 739 @Override 740 public Type baseType() { 741 return tsym.type; 742 } 743 }; 744 } 745 746 /** 747 * The constant value of this type, converted to String 748 */ 749 @Override 750 public String stringValue() { 751 Object cv = Assert.checkNonNull(constValue()); 752 if (tag == BOOLEAN) { 753 return ((Integer) cv).intValue() == 0 ? "false" : "true"; 754 } 755 else if (tag == CHAR) { 756 return String.valueOf((char) ((Integer) cv).intValue()); 757 } 758 else { 759 return cv.toString(); 760 } 761 } 762 763 /** Is this a constant type whose value is false? 764 */ 765 @Override 766 public boolean isFalse() { 767 return 768 tag == BOOLEAN && 769 constValue() != null && 770 ((Integer)constValue()).intValue() == 0; 771 } 772 773 /** Is this a constant type whose value is true? 774 */ 775 @Override 776 public boolean isTrue() { 777 return 778 tag == BOOLEAN && 779 constValue() != null && 780 ((Integer)constValue()).intValue() != 0; 781 } 782 783 @Override @DefinedBy(Api.LANGUAGE_MODEL) 784 public <R, P> R accept(TypeVisitor<R, P> v, P p) { 785 return v.visitPrimitive(this, p); 786 } 787 788 @Override @DefinedBy(Api.LANGUAGE_MODEL) 789 public TypeKind getKind() { 790 switch (tag) { 791 case BYTE: return TypeKind.BYTE; 792 case CHAR: return TypeKind.CHAR; 793 case SHORT: return TypeKind.SHORT; 794 case INT: return TypeKind.INT; 795 case LONG: return TypeKind.LONG; 796 case FLOAT: return TypeKind.FLOAT; 797 case DOUBLE: return TypeKind.DOUBLE; 798 case BOOLEAN: return TypeKind.BOOLEAN; 799 } 800 throw new AssertionError(); 801 } 802 803 } 804 805 public static class WildcardType extends Type 806 implements javax.lang.model.type.WildcardType { 807 808 public Type type; 809 public BoundKind kind; 810 public TypeVar bound; 811 812 @Override 813 public <R,S> R accept(Type.Visitor<R,S> v, S s) { 814 return v.visitWildcardType(this, s); 815 } 816 817 public WildcardType(Type type, BoundKind kind, TypeSymbol tsym) { 818 this(type, kind, tsym, null, TypeMetadata.EMPTY); 819 } 820 821 public WildcardType(Type type, BoundKind kind, TypeSymbol tsym, 822 TypeMetadata metadata) { 823 this(type, kind, tsym, null, metadata); 824 } 825 826 public WildcardType(Type type, BoundKind kind, TypeSymbol tsym, 827 TypeVar bound) { 828 this(type, kind, tsym, bound, TypeMetadata.EMPTY); 829 } 830 831 public WildcardType(Type type, BoundKind kind, TypeSymbol tsym, 832 TypeVar bound, TypeMetadata metadata) { 833 super(tsym, metadata); 834 this.type = Assert.checkNonNull(type); 835 this.kind = kind; 836 this.bound = bound; 837 } 838 839 @Override 840 public WildcardType cloneWithMetadata(TypeMetadata md) { 841 return new WildcardType(type, kind, tsym, bound, md) { 842 @Override 843 public Type baseType() { return WildcardType.this.baseType(); } 844 }; 845 } 846 847 @Override 848 public TypeTag getTag() { 849 return WILDCARD; 850 } 851 852 @Override 853 public boolean contains(Type t) { 854 return kind != UNBOUND && type.contains(t); 855 } 856 857 public boolean isSuperBound() { 858 return kind == SUPER || 859 kind == UNBOUND; 860 } 861 public boolean isExtendsBound() { 862 return kind == EXTENDS || 863 kind == UNBOUND; 864 } 865 public boolean isUnbound() { 866 return kind == UNBOUND; 867 } 868 869 @Override 870 public boolean isReference() { 871 return true; 872 } 873 874 @Override 875 public boolean isNullOrReference() { 876 return true; 877 } 878 879 @Override 880 public Type withTypeVar(Type t) { 881 //-System.err.println(this+".withTypeVar("+t+");");//DEBUG 882 if (bound == t) 883 return this; 884 bound = (TypeVar)t; 885 return this; 886 } 887 888 boolean isPrintingBound = false; 889 @DefinedBy(Api.LANGUAGE_MODEL) 890 public String toString() { 891 StringBuilder s = new StringBuilder(); 892 appendAnnotationsString(s); 893 s.append(kind.toString()); 894 if (kind != UNBOUND) 895 s.append(type); 896 if (moreInfo && bound != null && !isPrintingBound) 897 try { 898 isPrintingBound = true; 899 s.append("{:").append(bound.bound).append(":}"); 900 } finally { 901 isPrintingBound = false; 902 } 903 return s.toString(); 904 } 905 906 @DefinedBy(Api.LANGUAGE_MODEL) 907 public Type getExtendsBound() { 908 if (kind == EXTENDS) 909 return type; 910 else 911 return null; 912 } 913 914 @DefinedBy(Api.LANGUAGE_MODEL) 915 public Type getSuperBound() { 916 if (kind == SUPER) 917 return type; 918 else 919 return null; 920 } 921 922 @DefinedBy(Api.LANGUAGE_MODEL) 923 public TypeKind getKind() { 924 return TypeKind.WILDCARD; 925 } 926 927 @DefinedBy(Api.LANGUAGE_MODEL) 928 public <R, P> R accept(TypeVisitor<R, P> v, P p) { 929 return v.visitWildcard(this, p); 930 } 931 } 932 933 public static class ClassType extends Type implements DeclaredType { 934 935 /** The enclosing type of this type. If this is the type of an inner 936 * class, outer_field refers to the type of its enclosing 937 * instance class, in all other cases it refers to noType. 938 */ 939 private Type outer_field; 940 941 /** The type parameters of this type (to be set once class is loaded). 942 */ 943 public List<Type> typarams_field; 944 945 /** A cache variable for the type parameters of this type, 946 * appended to all parameters of its enclosing class. 947 * @see #allparams 948 */ 949 public List<Type> allparams_field; 950 951 /** The supertype of this class (to be set once class is loaded). 952 */ 953 public Type supertype_field; 954 955 /** The interfaces of this class (to be set once class is loaded). 956 */ 957 public List<Type> interfaces_field; 958 959 /** All the interfaces of this class, including missing ones. 960 */ 961 public List<Type> all_interfaces_field; 962 963 public ClassType(Type outer, List<Type> typarams, TypeSymbol tsym) { 964 this(outer, typarams, tsym, TypeMetadata.EMPTY); 965 } 966 967 public ClassType(Type outer, List<Type> typarams, TypeSymbol tsym, 968 TypeMetadata metadata) { 969 super(tsym, metadata); 970 this.outer_field = outer; 971 this.typarams_field = typarams; 972 this.allparams_field = null; 973 this.supertype_field = null; 974 this.interfaces_field = null; 975 } 976 977 @Override 978 public ClassType cloneWithMetadata(TypeMetadata md) { 979 return new ClassType(outer_field, typarams_field, tsym, md) { 980 @Override 981 public Type baseType() { return ClassType.this.baseType(); } 982 }; 983 } 984 985 @Override 986 public TypeTag getTag() { 987 return CLASS; 988 } 989 990 @Override 991 public <R,S> R accept(Type.Visitor<R,S> v, S s) { 992 return v.visitClassType(this, s); 993 } 994 995 public Type constType(Object constValue) { 996 final Object value = constValue; 997 return new ClassType(getEnclosingType(), typarams_field, tsym, metadata) { 998 @Override 999 public Object constValue() { 1000 return value; 1001 } 1002 @Override 1003 public Type baseType() { 1004 return tsym.type; 1005 } 1006 }; 1007 } 1008 1009 /** The Java source which this type represents. 1010 */ 1011 @DefinedBy(Api.LANGUAGE_MODEL) 1012 public String toString() { 1013 StringBuilder buf = new StringBuilder(); 1014 if (getEnclosingType().hasTag(CLASS) && tsym.owner.kind == TYP) { 1015 buf.append(getEnclosingType().toString()); 1016 buf.append("."); 1017 appendAnnotationsString(buf); 1018 buf.append(className(tsym, false)); 1019 } else { 1020 appendAnnotationsString(buf); 1021 buf.append(className(tsym, true)); 1022 } 1023 1024 if (getTypeArguments().nonEmpty()) { 1025 buf.append('<'); 1026 buf.append(getTypeArguments().toString()); 1027 buf.append(">"); 1028 } 1029 return buf.toString(); 1030 } 1031//where 1032 private String className(Symbol sym, boolean longform) { 1033 if (sym.name.isEmpty() && (sym.flags() & COMPOUND) != 0) { 1034 StringBuilder s = new StringBuilder(supertype_field.toString()); 1035 for (List<Type> is=interfaces_field; is.nonEmpty(); is = is.tail) { 1036 s.append("&"); 1037 s.append(is.head.toString()); 1038 } 1039 return s.toString(); 1040 } else if (sym.name.isEmpty()) { 1041 String s; 1042 ClassType norm = (ClassType) tsym.type; 1043 if (norm == null) { 1044 s = Log.getLocalizedString("anonymous.class", (Object)null); 1045 } else if (norm.interfaces_field != null && norm.interfaces_field.nonEmpty()) { 1046 s = Log.getLocalizedString("anonymous.class", 1047 norm.interfaces_field.head); 1048 } else { 1049 s = Log.getLocalizedString("anonymous.class", 1050 norm.supertype_field); 1051 } 1052 if (moreInfo) 1053 s += String.valueOf(sym.hashCode()); 1054 return s; 1055 } else if (longform) { 1056 return sym.getQualifiedName().toString(); 1057 } else { 1058 return sym.name.toString(); 1059 } 1060 } 1061 1062 @DefinedBy(Api.LANGUAGE_MODEL) 1063 public List<Type> getTypeArguments() { 1064 if (typarams_field == null) { 1065 complete(); 1066 if (typarams_field == null) 1067 typarams_field = List.nil(); 1068 } 1069 return typarams_field; 1070 } 1071 1072 public boolean hasErasedSupertypes() { 1073 return isRaw(); 1074 } 1075 1076 @DefinedBy(Api.LANGUAGE_MODEL) 1077 public Type getEnclosingType() { 1078 return outer_field; 1079 } 1080 1081 public void setEnclosingType(Type outer) { 1082 outer_field = outer; 1083 } 1084 1085 public List<Type> allparams() { 1086 if (allparams_field == null) { 1087 allparams_field = getTypeArguments().prependList(getEnclosingType().allparams()); 1088 } 1089 return allparams_field; 1090 } 1091 1092 public boolean isErroneous() { 1093 return 1094 getEnclosingType().isErroneous() || 1095 isErroneous(getTypeArguments()) || 1096 this != tsym.type && tsym.type.isErroneous(); 1097 } 1098 1099 public boolean isParameterized() { 1100 return allparams().tail != null; 1101 // optimization, was: allparams().nonEmpty(); 1102 } 1103 1104 @Override 1105 public boolean isReference() { 1106 return true; 1107 } 1108 1109 @Override 1110 public boolean isNullOrReference() { 1111 return true; 1112 } 1113 1114 /** A cache for the rank. */ 1115 int rank_field = -1; 1116 1117 /** A class type is raw if it misses some 1118 * of its type parameter sections. 1119 * After validation, this is equivalent to: 1120 * {@code allparams.isEmpty() && tsym.type.allparams.nonEmpty(); } 1121 */ 1122 public boolean isRaw() { 1123 return 1124 this != tsym.type && // necessary, but not sufficient condition 1125 tsym.type.allparams().nonEmpty() && 1126 allparams().isEmpty(); 1127 } 1128 1129 public boolean contains(Type elem) { 1130 return 1131 elem.equalsIgnoreMetadata(this) 1132 || (isParameterized() 1133 && (getEnclosingType().contains(elem) || contains(getTypeArguments(), elem))) 1134 || (isCompound() 1135 && (supertype_field.contains(elem) || contains(interfaces_field, elem))); 1136 } 1137 1138 public void complete() { 1139 tsym.complete(); 1140 } 1141 1142 @DefinedBy(Api.LANGUAGE_MODEL) 1143 public TypeKind getKind() { 1144 return TypeKind.DECLARED; 1145 } 1146 1147 @DefinedBy(Api.LANGUAGE_MODEL) 1148 public <R, P> R accept(TypeVisitor<R, P> v, P p) { 1149 return v.visitDeclared(this, p); 1150 } 1151 } 1152 1153 public static class ErasedClassType extends ClassType { 1154 public ErasedClassType(Type outer, TypeSymbol tsym, 1155 TypeMetadata metadata) { 1156 super(outer, List.nil(), tsym, metadata); 1157 } 1158 1159 @Override 1160 public boolean hasErasedSupertypes() { 1161 return true; 1162 } 1163 } 1164 1165 // a clone of a ClassType that knows about the alternatives of a union type. 1166 public static class UnionClassType extends ClassType implements UnionType { 1167 final List<? extends Type> alternatives_field; 1168 1169 public UnionClassType(ClassType ct, List<? extends Type> alternatives) { 1170 // Presently no way to refer to this type directly, so we 1171 // cannot put annotations directly on it. 1172 super(ct.outer_field, ct.typarams_field, ct.tsym); 1173 allparams_field = ct.allparams_field; 1174 supertype_field = ct.supertype_field; 1175 interfaces_field = ct.interfaces_field; 1176 all_interfaces_field = ct.interfaces_field; 1177 alternatives_field = alternatives; 1178 } 1179 1180 @Override 1181 public UnionClassType cloneWithMetadata(TypeMetadata md) { 1182 throw new AssertionError("Cannot add metadata to a union type"); 1183 } 1184 1185 public Type getLub() { 1186 return tsym.type; 1187 } 1188 1189 @DefinedBy(Api.LANGUAGE_MODEL) 1190 public java.util.List<? extends TypeMirror> getAlternatives() { 1191 return Collections.unmodifiableList(alternatives_field); 1192 } 1193 1194 @Override 1195 public boolean isUnion() { 1196 return true; 1197 } 1198 1199 @Override 1200 public boolean isCompound() { 1201 return getLub().isCompound(); 1202 } 1203 1204 @Override @DefinedBy(Api.LANGUAGE_MODEL) 1205 public TypeKind getKind() { 1206 return TypeKind.UNION; 1207 } 1208 1209 @Override @DefinedBy(Api.LANGUAGE_MODEL) 1210 public <R, P> R accept(TypeVisitor<R, P> v, P p) { 1211 return v.visitUnion(this, p); 1212 } 1213 1214 public Iterable<? extends Type> getAlternativeTypes() { 1215 return alternatives_field; 1216 } 1217 } 1218 1219 // a clone of a ClassType that knows about the bounds of an intersection type. 1220 public static class IntersectionClassType extends ClassType implements IntersectionType { 1221 1222 public boolean allInterfaces; 1223 1224 public IntersectionClassType(List<Type> bounds, ClassSymbol csym, boolean allInterfaces) { 1225 // Presently no way to refer to this type directly, so we 1226 // cannot put annotations directly on it. 1227 super(Type.noType, List.nil(), csym); 1228 this.allInterfaces = allInterfaces; 1229 Assert.check((csym.flags() & COMPOUND) != 0); 1230 supertype_field = bounds.head; 1231 interfaces_field = bounds.tail; 1232 Assert.check(!supertype_field.tsym.isCompleted() || 1233 !supertype_field.isInterface(), supertype_field); 1234 } 1235 1236 @Override 1237 public IntersectionClassType cloneWithMetadata(TypeMetadata md) { 1238 throw new AssertionError("Cannot add metadata to an intersection type"); 1239 } 1240 1241 @DefinedBy(Api.LANGUAGE_MODEL) 1242 public java.util.List<? extends TypeMirror> getBounds() { 1243 return Collections.unmodifiableList(getExplicitComponents()); 1244 } 1245 1246 @Override 1247 public boolean isCompound() { 1248 return true; 1249 } 1250 1251 public List<Type> getComponents() { 1252 return interfaces_field.prepend(supertype_field); 1253 } 1254 1255 @Override 1256 public boolean isIntersection() { 1257 return true; 1258 } 1259 1260 public List<Type> getExplicitComponents() { 1261 return allInterfaces ? 1262 interfaces_field : 1263 getComponents(); 1264 } 1265 1266 @Override @DefinedBy(Api.LANGUAGE_MODEL) 1267 public TypeKind getKind() { 1268 return TypeKind.INTERSECTION; 1269 } 1270 1271 @Override @DefinedBy(Api.LANGUAGE_MODEL) 1272 public <R, P> R accept(TypeVisitor<R, P> v, P p) { 1273 return v.visitIntersection(this, p); 1274 } 1275 } 1276 1277 public static class ArrayType extends Type 1278 implements javax.lang.model.type.ArrayType { 1279 1280 public Type elemtype; 1281 1282 public ArrayType(Type elemtype, TypeSymbol arrayClass) { 1283 this(elemtype, arrayClass, TypeMetadata.EMPTY); 1284 } 1285 1286 public ArrayType(Type elemtype, TypeSymbol arrayClass, 1287 TypeMetadata metadata) { 1288 super(arrayClass, metadata); 1289 this.elemtype = elemtype; 1290 } 1291 1292 public ArrayType(ArrayType that) { 1293 //note: type metadata is deliberately shared here, as we want side-effects from annotation 1294 //processing to flow from original array to the cloned array. 1295 this(that.elemtype, that.tsym, that.getMetadata()); 1296 } 1297 1298 @Override 1299 public ArrayType cloneWithMetadata(TypeMetadata md) { 1300 return new ArrayType(elemtype, tsym, md) { 1301 @Override 1302 public Type baseType() { return ArrayType.this.baseType(); } 1303 }; 1304 } 1305 1306 @Override 1307 public TypeTag getTag() { 1308 return ARRAY; 1309 } 1310 1311 public <R,S> R accept(Type.Visitor<R,S> v, S s) { 1312 return v.visitArrayType(this, s); 1313 } 1314 1315 @DefinedBy(Api.LANGUAGE_MODEL) 1316 public String toString() { 1317 StringBuilder sb = new StringBuilder(); 1318 1319 // First append root component type 1320 Type t = elemtype; 1321 while (t.getKind() == TypeKind.ARRAY) 1322 t = ((ArrayType) t).getComponentType(); 1323 sb.append(t); 1324 1325 // then append @Anno[] @Anno[] ... @Anno[] 1326 t = this; 1327 do { 1328 t.appendAnnotationsString(sb, true); 1329 sb.append("[]"); 1330 t = ((ArrayType) t).getComponentType(); 1331 } while (t.getKind() == TypeKind.ARRAY); 1332 1333 return sb.toString(); 1334 } 1335 1336 @Override @DefinedBy(Api.LANGUAGE_MODEL) 1337 public boolean equals(Object obj) { 1338 if (obj instanceof ArrayType) { 1339 ArrayType that = (ArrayType)obj; 1340 return this == that || 1341 elemtype.equals(that.elemtype); 1342 } 1343 1344 return false; 1345 } 1346 1347 @DefinedBy(Api.LANGUAGE_MODEL) 1348 public int hashCode() { 1349 return (ARRAY.ordinal() << 5) + elemtype.hashCode(); 1350 } 1351 1352 public boolean isVarargs() { 1353 return false; 1354 } 1355 1356 public List<Type> allparams() { return elemtype.allparams(); } 1357 1358 public boolean isErroneous() { 1359 return elemtype.isErroneous(); 1360 } 1361 1362 public boolean isParameterized() { 1363 return elemtype.isParameterized(); 1364 } 1365 1366 @Override 1367 public boolean isReference() { 1368 return true; 1369 } 1370 1371 @Override 1372 public boolean isNullOrReference() { 1373 return true; 1374 } 1375 1376 public boolean isRaw() { 1377 return elemtype.isRaw(); 1378 } 1379 1380 public ArrayType makeVarargs() { 1381 return new ArrayType(elemtype, tsym, metadata) { 1382 @Override 1383 public boolean isVarargs() { 1384 return true; 1385 } 1386 }; 1387 } 1388 1389 public boolean contains(Type elem) { 1390 return elem.equalsIgnoreMetadata(this) || elemtype.contains(elem); 1391 } 1392 1393 public void complete() { 1394 elemtype.complete(); 1395 } 1396 1397 @DefinedBy(Api.LANGUAGE_MODEL) 1398 public Type getComponentType() { 1399 return elemtype; 1400 } 1401 1402 @DefinedBy(Api.LANGUAGE_MODEL) 1403 public TypeKind getKind() { 1404 return TypeKind.ARRAY; 1405 } 1406 1407 @DefinedBy(Api.LANGUAGE_MODEL) 1408 public <R, P> R accept(TypeVisitor<R, P> v, P p) { 1409 return v.visitArray(this, p); 1410 } 1411 } 1412 1413 public static class MethodType extends Type implements ExecutableType { 1414 1415 public List<Type> argtypes; 1416 public Type restype; 1417 public List<Type> thrown; 1418 1419 /** The type annotations on the method receiver. 1420 */ 1421 public Type recvtype; 1422 1423 public MethodType(List<Type> argtypes, 1424 Type restype, 1425 List<Type> thrown, 1426 TypeSymbol methodClass) { 1427 // Presently no way to refer to a method type directly, so 1428 // we cannot put type annotations on it. 1429 super(methodClass, TypeMetadata.EMPTY); 1430 this.argtypes = argtypes; 1431 this.restype = restype; 1432 this.thrown = thrown; 1433 } 1434 1435 @Override 1436 public MethodType cloneWithMetadata(TypeMetadata md) { 1437 throw new AssertionError("Cannot add metadata to a method type"); 1438 } 1439 1440 @Override 1441 public TypeTag getTag() { 1442 return METHOD; 1443 } 1444 1445 public <R,S> R accept(Type.Visitor<R,S> v, S s) { 1446 return v.visitMethodType(this, s); 1447 } 1448 1449 /** The Java source which this type represents. 1450 * 1451 * XXX 06/09/99 iris This isn't correct Java syntax, but it probably 1452 * should be. 1453 */ 1454 @DefinedBy(Api.LANGUAGE_MODEL) 1455 public String toString() { 1456 StringBuilder sb = new StringBuilder(); 1457 appendAnnotationsString(sb); 1458 sb.append('('); 1459 sb.append(argtypes); 1460 sb.append(')'); 1461 sb.append(restype); 1462 return sb.toString(); 1463 } 1464 1465 @DefinedBy(Api.LANGUAGE_MODEL) 1466 public List<Type> getParameterTypes() { return argtypes; } 1467 @DefinedBy(Api.LANGUAGE_MODEL) 1468 public Type getReturnType() { return restype; } 1469 @DefinedBy(Api.LANGUAGE_MODEL) 1470 public Type getReceiverType() { return recvtype; } 1471 @DefinedBy(Api.LANGUAGE_MODEL) 1472 public List<Type> getThrownTypes() { return thrown; } 1473 1474 public boolean isErroneous() { 1475 return 1476 isErroneous(argtypes) || 1477 restype != null && restype.isErroneous(); 1478 } 1479 1480 public boolean contains(Type elem) { 1481 return elem.equalsIgnoreMetadata(this) || contains(argtypes, elem) || restype.contains(elem) || contains(thrown, elem); 1482 } 1483 1484 public MethodType asMethodType() { return this; } 1485 1486 public void complete() { 1487 for (List<Type> l = argtypes; l.nonEmpty(); l = l.tail) 1488 l.head.complete(); 1489 restype.complete(); 1490 recvtype.complete(); 1491 for (List<Type> l = thrown; l.nonEmpty(); l = l.tail) 1492 l.head.complete(); 1493 } 1494 1495 @DefinedBy(Api.LANGUAGE_MODEL) 1496 public List<TypeVar> getTypeVariables() { 1497 return List.nil(); 1498 } 1499 1500 public TypeSymbol asElement() { 1501 return null; 1502 } 1503 1504 @DefinedBy(Api.LANGUAGE_MODEL) 1505 public TypeKind getKind() { 1506 return TypeKind.EXECUTABLE; 1507 } 1508 1509 @DefinedBy(Api.LANGUAGE_MODEL) 1510 public <R, P> R accept(TypeVisitor<R, P> v, P p) { 1511 return v.visitExecutable(this, p); 1512 } 1513 } 1514 1515 public static class PackageType extends Type implements NoType { 1516 1517 PackageType(PackageSymbol tsym) { 1518 // Package types cannot be annotated 1519 super(tsym, TypeMetadata.EMPTY); 1520 } 1521 1522 @Override 1523 public PackageType cloneWithMetadata(TypeMetadata md) { 1524 throw new AssertionError("Cannot add metadata to a package type"); 1525 } 1526 1527 @Override 1528 public TypeTag getTag() { 1529 return PACKAGE; 1530 } 1531 1532 @Override 1533 public <R,S> R accept(Type.Visitor<R,S> v, S s) { 1534 return v.visitPackageType(this, s); 1535 } 1536 1537 @DefinedBy(Api.LANGUAGE_MODEL) 1538 public String toString() { 1539 return tsym.getQualifiedName().toString(); 1540 } 1541 1542 @DefinedBy(Api.LANGUAGE_MODEL) 1543 public TypeKind getKind() { 1544 return TypeKind.PACKAGE; 1545 } 1546 1547 @DefinedBy(Api.LANGUAGE_MODEL) 1548 public <R, P> R accept(TypeVisitor<R, P> v, P p) { 1549 return v.visitNoType(this, p); 1550 } 1551 } 1552 1553 public static class ModuleType extends Type implements NoType { 1554 1555 ModuleType(ModuleSymbol tsym) { 1556 // Module types cannot be annotated 1557 super(tsym, TypeMetadata.EMPTY); 1558 } 1559 1560 @Override 1561 public ModuleType cloneWithMetadata(TypeMetadata md) { 1562 throw new AssertionError("Cannot add metadata to a module type"); 1563 } 1564 1565 @Override 1566 public ModuleType annotatedType(List<Attribute.TypeCompound> annos) { 1567 throw new AssertionError("Cannot annotate a module type"); 1568 } 1569 1570 @Override 1571 public TypeTag getTag() { 1572 return TypeTag.MODULE; 1573 } 1574 1575 @Override 1576 public <R,S> R accept(Type.Visitor<R,S> v, S s) { 1577 return v.visitModuleType(this, s); 1578 } 1579 1580 @Override @DefinedBy(Api.LANGUAGE_MODEL) 1581 public String toString() { 1582 return tsym.getQualifiedName().toString(); 1583 } 1584 1585 @Override @DefinedBy(Api.LANGUAGE_MODEL) 1586 public TypeKind getKind() { 1587 return TypeKind.MODULE; 1588 } 1589 1590 @Override @DefinedBy(Api.LANGUAGE_MODEL) 1591 public <R, P> R accept(TypeVisitor<R, P> v, P p) { 1592 return v.visitNoType(this, p); 1593 } 1594 } 1595 1596 public static class TypeVar extends Type implements TypeVariable { 1597 1598 /** The upper bound of this type variable; set from outside. 1599 * Must be nonempty once it is set. 1600 * For a bound, `bound' is the bound type itself. 1601 * Multiple bounds are expressed as a single class type which has the 1602 * individual bounds as superclass, respectively interfaces. 1603 * The class type then has as `tsym' a compiler generated class `c', 1604 * which has a flag COMPOUND and whose owner is the type variable 1605 * itself. Furthermore, the erasure_field of the class 1606 * points to the first class or interface bound. 1607 */ 1608 public Type bound = null; 1609 1610 /** The lower bound of this type variable. 1611 * TypeVars don't normally have a lower bound, so it is normally set 1612 * to syms.botType. 1613 * Subtypes, such as CapturedType, may provide a different value. 1614 */ 1615 public Type lower; 1616 1617 public TypeVar(Name name, Symbol owner, Type lower) { 1618 super(null, TypeMetadata.EMPTY); 1619 tsym = new TypeVariableSymbol(0, name, this, owner); 1620 this.bound = null; 1621 this.lower = lower; 1622 } 1623 1624 public TypeVar(TypeSymbol tsym, Type bound, Type lower) { 1625 this(tsym, bound, lower, TypeMetadata.EMPTY); 1626 } 1627 1628 public TypeVar(TypeSymbol tsym, Type bound, Type lower, 1629 TypeMetadata metadata) { 1630 super(tsym, metadata); 1631 this.bound = bound; 1632 this.lower = lower; 1633 } 1634 1635 @Override 1636 public TypeVar cloneWithMetadata(TypeMetadata md) { 1637 return new TypeVar(tsym, bound, lower, md) { 1638 @Override 1639 public Type baseType() { return TypeVar.this.baseType(); } 1640 }; 1641 } 1642 1643 @Override 1644 public TypeTag getTag() { 1645 return TYPEVAR; 1646 } 1647 1648 @Override 1649 public <R,S> R accept(Type.Visitor<R,S> v, S s) { 1650 return v.visitTypeVar(this, s); 1651 } 1652 1653 @Override @DefinedBy(Api.LANGUAGE_MODEL) 1654 public Type getUpperBound() { 1655 if ((bound == null || bound.hasTag(NONE)) && this != tsym.type) { 1656 bound = tsym.type.getUpperBound(); 1657 } 1658 return bound; 1659 } 1660 1661 int rank_field = -1; 1662 1663 @Override @DefinedBy(Api.LANGUAGE_MODEL) 1664 public Type getLowerBound() { 1665 return lower; 1666 } 1667 1668 @DefinedBy(Api.LANGUAGE_MODEL) 1669 public TypeKind getKind() { 1670 return TypeKind.TYPEVAR; 1671 } 1672 1673 public boolean isCaptured() { 1674 return false; 1675 } 1676 1677 @Override 1678 public boolean isReference() { 1679 return true; 1680 } 1681 1682 @Override 1683 public boolean isNullOrReference() { 1684 return true; 1685 } 1686 1687 @Override @DefinedBy(Api.LANGUAGE_MODEL) 1688 public <R, P> R accept(TypeVisitor<R, P> v, P p) { 1689 return v.visitTypeVariable(this, p); 1690 } 1691 } 1692 1693 /** A captured type variable comes from wildcards which can have 1694 * both upper and lower bound. CapturedType extends TypeVar with 1695 * a lower bound. 1696 */ 1697 public static class CapturedType extends TypeVar { 1698 1699 public WildcardType wildcard; 1700 1701 public CapturedType(Name name, 1702 Symbol owner, 1703 Type upper, 1704 Type lower, 1705 WildcardType wildcard) { 1706 super(name, owner, lower); 1707 this.lower = Assert.checkNonNull(lower); 1708 this.bound = upper; 1709 this.wildcard = wildcard; 1710 } 1711 1712 public CapturedType(TypeSymbol tsym, 1713 Type bound, 1714 Type upper, 1715 Type lower, 1716 WildcardType wildcard, 1717 TypeMetadata metadata) { 1718 super(tsym, bound, lower, metadata); 1719 this.wildcard = wildcard; 1720 } 1721 1722 @Override 1723 public CapturedType cloneWithMetadata(TypeMetadata md) { 1724 return new CapturedType(tsym, bound, bound, lower, wildcard, md) { 1725 @Override 1726 public Type baseType() { return CapturedType.this.baseType(); } 1727 }; 1728 } 1729 1730 @Override 1731 public <R,S> R accept(Type.Visitor<R,S> v, S s) { 1732 return v.visitCapturedType(this, s); 1733 } 1734 1735 @Override 1736 public boolean isCaptured() { 1737 return true; 1738 } 1739 1740 @Override @DefinedBy(Api.LANGUAGE_MODEL) 1741 public String toString() { 1742 StringBuilder sb = new StringBuilder(); 1743 appendAnnotationsString(sb); 1744 sb.append("capture#"); 1745 sb.append((hashCode() & 0xFFFFFFFFL) % Printer.PRIME); 1746 sb.append(" of "); 1747 sb.append(wildcard); 1748 return sb.toString(); 1749 } 1750 } 1751 1752 public static abstract class DelegatedType extends Type { 1753 public Type qtype; 1754 public TypeTag tag; 1755 1756 public DelegatedType(TypeTag tag, Type qtype) { 1757 this(tag, qtype, TypeMetadata.EMPTY); 1758 } 1759 1760 public DelegatedType(TypeTag tag, Type qtype, 1761 TypeMetadata metadata) { 1762 super(qtype.tsym, metadata); 1763 this.tag = tag; 1764 this.qtype = qtype; 1765 } 1766 1767 public TypeTag getTag() { return tag; } 1768 @DefinedBy(Api.LANGUAGE_MODEL) 1769 public String toString() { return qtype.toString(); } 1770 public List<Type> getTypeArguments() { return qtype.getTypeArguments(); } 1771 public Type getEnclosingType() { return qtype.getEnclosingType(); } 1772 public List<Type> getParameterTypes() { return qtype.getParameterTypes(); } 1773 public Type getReturnType() { return qtype.getReturnType(); } 1774 public Type getReceiverType() { return qtype.getReceiverType(); } 1775 public List<Type> getThrownTypes() { return qtype.getThrownTypes(); } 1776 public List<Type> allparams() { return qtype.allparams(); } 1777 public Type getUpperBound() { return qtype.getUpperBound(); } 1778 public boolean isErroneous() { return qtype.isErroneous(); } 1779 } 1780 1781 /** 1782 * The type of a generic method type. It consists of a method type and 1783 * a list of method type-parameters that are used within the method 1784 * type. 1785 */ 1786 public static class ForAll extends DelegatedType implements ExecutableType { 1787 public List<Type> tvars; 1788 1789 public ForAll(List<Type> tvars, Type qtype) { 1790 super(FORALL, (MethodType)qtype); 1791 this.tvars = tvars; 1792 } 1793 1794 @Override 1795 public ForAll cloneWithMetadata(TypeMetadata md) { 1796 throw new AssertionError("Cannot add metadata to a forall type"); 1797 } 1798 1799 @Override 1800 public <R,S> R accept(Type.Visitor<R,S> v, S s) { 1801 return v.visitForAll(this, s); 1802 } 1803 1804 @DefinedBy(Api.LANGUAGE_MODEL) 1805 public String toString() { 1806 StringBuilder sb = new StringBuilder(); 1807 appendAnnotationsString(sb); 1808 sb.append('<'); 1809 sb.append(tvars); 1810 sb.append('>'); 1811 sb.append(qtype); 1812 return sb.toString(); 1813 } 1814 1815 public List<Type> getTypeArguments() { return tvars; } 1816 1817 public boolean isErroneous() { 1818 return qtype.isErroneous(); 1819 } 1820 1821 public boolean contains(Type elem) { 1822 return qtype.contains(elem); 1823 } 1824 1825 public MethodType asMethodType() { 1826 return (MethodType)qtype; 1827 } 1828 1829 public void complete() { 1830 for (List<Type> l = tvars; l.nonEmpty(); l = l.tail) { 1831 ((TypeVar)l.head).bound.complete(); 1832 } 1833 qtype.complete(); 1834 } 1835 1836 @DefinedBy(Api.LANGUAGE_MODEL) 1837 public List<TypeVar> getTypeVariables() { 1838 return List.convert(TypeVar.class, getTypeArguments()); 1839 } 1840 1841 @DefinedBy(Api.LANGUAGE_MODEL) 1842 public TypeKind getKind() { 1843 return TypeKind.EXECUTABLE; 1844 } 1845 1846 @DefinedBy(Api.LANGUAGE_MODEL) 1847 public <R, P> R accept(TypeVisitor<R, P> v, P p) { 1848 return v.visitExecutable(this, p); 1849 } 1850 } 1851 1852 /** A class for inference variables, for use during method/diamond type 1853 * inference. An inference variable has upper/lower bounds and a set 1854 * of equality constraints. Such bounds are set during subtyping, type-containment, 1855 * type-equality checks, when the types being tested contain inference variables. 1856 * A change listener can be attached to an inference variable, to receive notifications 1857 * whenever the bounds of an inference variable change. 1858 */ 1859 public static class UndetVar extends DelegatedType { 1860 1861 enum Kind { 1862 NORMAL, 1863 CAPTURED, 1864 THROWS; 1865 } 1866 1867 /** Inference variable change listener. The listener method is called 1868 * whenever a change to the inference variable's bounds occurs 1869 */ 1870 public interface UndetVarListener { 1871 /** called when some inference variable bounds (of given kinds ibs) change */ 1872 void varBoundChanged(UndetVar uv, InferenceBound ib, Type bound, boolean update); 1873 /** called when the inferred type is set on some inference variable */ 1874 default void varInstantiated(UndetVar uv) { Assert.error(); } 1875 } 1876 1877 /** 1878 * Inference variable bound kinds 1879 */ 1880 public enum InferenceBound { 1881 /** lower bounds */ 1882 LOWER { 1883 public InferenceBound complement() { return UPPER; } 1884 }, 1885 /** equality constraints */ 1886 EQ { 1887 public InferenceBound complement() { return EQ; } 1888 }, 1889 /** upper bounds */ 1890 UPPER { 1891 public InferenceBound complement() { return LOWER; } 1892 }; 1893 1894 public abstract InferenceBound complement(); 1895 1896 public boolean lessThan(InferenceBound that) { 1897 if (that == this) { 1898 return false; 1899 } else { 1900 switch (that) { 1901 case UPPER: return true; 1902 case LOWER: return false; 1903 case EQ: return (this != UPPER); 1904 default: 1905 Assert.error("Cannot get here!"); 1906 return false; 1907 } 1908 } 1909 } 1910 } 1911 1912 /** list of incorporation actions (used by the incorporation engine). */ 1913 public ArrayDeque<IncorporationAction> incorporationActions = new ArrayDeque<>(); 1914 1915 /** inference variable bounds */ 1916 protected Map<InferenceBound, List<Type>> bounds; 1917 1918 /** inference variable's inferred type (set from Infer.java) */ 1919 private Type inst = null; 1920 1921 /** number of declared (upper) bounds */ 1922 public int declaredCount; 1923 1924 /** inference variable's change listener */ 1925 public UndetVarListener listener = null; 1926 1927 Kind kind; 1928 1929 @Override 1930 public <R,S> R accept(Type.Visitor<R,S> v, S s) { 1931 return v.visitUndetVar(this, s); 1932 } 1933 1934 public UndetVar(TypeVar origin, UndetVarListener listener, Types types) { 1935 // This is a synthesized internal type, so we cannot annotate it. 1936 super(UNDETVAR, origin); 1937 this.kind = origin.isCaptured() ? 1938 Kind.CAPTURED : 1939 Kind.NORMAL; 1940 this.listener = listener; 1941 bounds = new EnumMap<>(InferenceBound.class); 1942 List<Type> declaredBounds = types.getBounds(origin); 1943 declaredCount = declaredBounds.length(); 1944 bounds.put(InferenceBound.UPPER, List.nil()); 1945 bounds.put(InferenceBound.LOWER, List.nil()); 1946 bounds.put(InferenceBound.EQ, List.nil()); 1947 for (Type t : declaredBounds.reverse()) { 1948 //add bound works in reverse order 1949 addBound(InferenceBound.UPPER, t, types, true); 1950 } 1951 if (origin.isCaptured() && !origin.lower.hasTag(BOT)) { 1952 //add lower bound if needed 1953 addBound(InferenceBound.LOWER, origin.lower, types, true); 1954 } 1955 } 1956 1957 @DefinedBy(Api.LANGUAGE_MODEL) 1958 public String toString() { 1959 StringBuilder sb = new StringBuilder(); 1960 appendAnnotationsString(sb); 1961 if (inst == null) { 1962 sb.append(qtype); 1963 sb.append('?'); 1964 } else { 1965 sb.append(inst); 1966 } 1967 return sb.toString(); 1968 } 1969 1970 public String debugString() { 1971 String result = "inference var = " + qtype + "\n"; 1972 if (inst != null) { 1973 result += "inst = " + inst + '\n'; 1974 } 1975 for (InferenceBound bound: InferenceBound.values()) { 1976 List<Type> aboundList = bounds.get(bound); 1977 if (aboundList.size() > 0) { 1978 result += bound + " = " + aboundList + '\n'; 1979 } 1980 } 1981 return result; 1982 } 1983 1984 public void setThrow() { 1985 if (this.kind == Kind.CAPTURED) { 1986 //invalid state transition 1987 throw new IllegalStateException(); 1988 } 1989 this.kind = Kind.THROWS; 1990 } 1991 1992 /** 1993 * Returns a new copy of this undet var. 1994 */ 1995 public UndetVar dup(Types types) { 1996 UndetVar uv2 = new UndetVar((TypeVar)qtype, listener, types); 1997 dupTo(uv2, types); 1998 return uv2; 1999 } 2000 2001 /** 2002 * Dumps the contents of this undet var on another undet var. 2003 */ 2004 public void dupTo(UndetVar uv2, Types types) { 2005 uv2.listener = null; 2006 uv2.bounds.clear(); 2007 for (InferenceBound ib : InferenceBound.values()) { 2008 uv2.bounds.put(ib, List.nil()); 2009 for (Type t : getBounds(ib)) { 2010 uv2.addBound(ib, t, types, true); 2011 } 2012 } 2013 uv2.inst = inst; 2014 uv2.listener = listener; 2015 uv2.incorporationActions = new ArrayDeque<>(); 2016 for (IncorporationAction action : incorporationActions) { 2017 uv2.incorporationActions.add(action.dup(uv2)); 2018 } 2019 } 2020 2021 @Override 2022 public UndetVar cloneWithMetadata(TypeMetadata md) { 2023 throw new AssertionError("Cannot add metadata to an UndetVar type"); 2024 } 2025 2026 @Override 2027 public boolean isPartial() { 2028 return true; 2029 } 2030 2031 @Override 2032 public Type baseType() { 2033 return (inst == null) ? this : inst.baseType(); 2034 } 2035 2036 public Type getInst() { 2037 return inst; 2038 } 2039 2040 public void setInst(Type inst) { 2041 this.inst = inst; 2042 if (listener != null) { 2043 listener.varInstantiated(this); 2044 } 2045 } 2046 2047 /** get all bounds of a given kind */ 2048 public List<Type> getBounds(InferenceBound... ibs) { 2049 ListBuffer<Type> buf = new ListBuffer<>(); 2050 for (InferenceBound ib : ibs) { 2051 buf.appendList(bounds.get(ib)); 2052 } 2053 return buf.toList(); 2054 } 2055 2056 /** get the list of declared (upper) bounds */ 2057 public List<Type> getDeclaredBounds() { 2058 ListBuffer<Type> buf = new ListBuffer<>(); 2059 int count = 0; 2060 for (Type b : getBounds(InferenceBound.UPPER)) { 2061 if (count++ == declaredCount) break; 2062 buf.append(b); 2063 } 2064 return buf.toList(); 2065 } 2066 2067 /** internal method used to override an undetvar bounds */ 2068 public void setBounds(InferenceBound ib, List<Type> newBounds) { 2069 bounds.put(ib, newBounds); 2070 } 2071 2072 /** add a bound of a given kind - this might trigger listener notification */ 2073 public final void addBound(InferenceBound ib, Type bound, Types types) { 2074 // Per JDK-8075793: in pre-8 sources, follow legacy javac behavior 2075 // when capture variables are inferred as bounds: for lower bounds, 2076 // map to the capture variable's upper bound; for upper bounds, 2077 // if the capture variable has a lower bound, map to that type 2078 if (types.mapCapturesToBounds) { 2079 switch (ib) { 2080 case LOWER: 2081 bound = types.cvarUpperBound(bound); 2082 break; 2083 case UPPER: 2084 Type altBound = types.cvarLowerBound(bound); 2085 if (!altBound.hasTag(TypeTag.BOT)) bound = altBound; 2086 break; 2087 } 2088 } 2089 addBound(ib, bound, types, false); 2090 } 2091 2092 @SuppressWarnings("fallthrough") 2093 private void addBound(InferenceBound ib, Type bound, Types types, boolean update) { 2094 if (kind == Kind.CAPTURED && !update) { 2095 //Captured inference variables bounds must not be updated during incorporation, 2096 //except when some inference variable (beta) has been instantiated in the 2097 //right-hand-side of a 'C<alpha> = capture(C<? extends/super beta>) constraint. 2098 if (bound.hasTag(UNDETVAR) && !((UndetVar)bound).isCaptured()) { 2099 //If the new incoming bound is itself a (regular) inference variable, 2100 //then we are allowed to propagate this inference variable bounds to it. 2101 ((UndetVar)bound).addBound(ib.complement(), this, types, false); 2102 } 2103 } else { 2104 Type bound2 = bound.map(toTypeVarMap).baseType(); 2105 List<Type> prevBounds = bounds.get(ib); 2106 if (bound == qtype) return; 2107 for (Type b : prevBounds) { 2108 //check for redundancy - use strict version of isSameType on tvars 2109 //(as the standard version will lead to false positives w.r.t. clones ivars) 2110 if (types.isSameType(b, bound2, true)) return; 2111 } 2112 bounds.put(ib, prevBounds.prepend(bound2)); 2113 notifyBoundChange(ib, bound2, false); 2114 } 2115 } 2116 //where 2117 TypeMapping<Void> toTypeVarMap = new StructuralTypeMapping<Void>() { 2118 @Override 2119 public Type visitUndetVar(UndetVar uv, Void _unused) { 2120 return uv.inst != null ? uv.inst : uv.qtype; 2121 } 2122 }; 2123 2124 /** replace types in all bounds - this might trigger listener notification */ 2125 public void substBounds(List<Type> from, List<Type> to, Types types) { 2126 final ListBuffer<Pair<InferenceBound, Type>> boundsChanged = new ListBuffer<>(); 2127 UndetVarListener prevListener = listener; 2128 try { 2129 //setup new listener for keeping track of changed bounds 2130 listener = (uv, ib, t, _ignored) -> { 2131 Assert.check(uv == UndetVar.this); 2132 boundsChanged.add(new Pair<>(ib, t)); 2133 }; 2134 for (Map.Entry<InferenceBound, List<Type>> _entry : bounds.entrySet()) { 2135 InferenceBound ib = _entry.getKey(); 2136 List<Type> prevBounds = _entry.getValue(); 2137 ListBuffer<Type> newBounds = new ListBuffer<>(); 2138 ListBuffer<Type> deps = new ListBuffer<>(); 2139 //step 1 - re-add bounds that are not dependent on ivars 2140 for (Type t : prevBounds) { 2141 if (!t.containsAny(from)) { 2142 newBounds.append(t); 2143 } else { 2144 deps.append(t); 2145 } 2146 } 2147 //step 2 - replace bounds 2148 bounds.put(ib, newBounds.toList()); 2149 //step 3 - for each dependency, add new replaced bound 2150 for (Type dep : deps) { 2151 addBound(ib, types.subst(dep, from, to), types, true); 2152 } 2153 } 2154 } finally { 2155 listener = prevListener; 2156 for (Pair<InferenceBound, Type> boundUpdate : boundsChanged) { 2157 notifyBoundChange(boundUpdate.fst, boundUpdate.snd, true); 2158 } 2159 } 2160 } 2161 2162 private void notifyBoundChange(InferenceBound ib, Type bound, boolean update) { 2163 if (listener != null) { 2164 listener.varBoundChanged(this, ib, bound, update); 2165 } 2166 } 2167 2168 public final boolean isCaptured() { 2169 return kind == Kind.CAPTURED; 2170 } 2171 2172 public final boolean isThrows() { 2173 return kind == Kind.THROWS; 2174 } 2175 } 2176 2177 /** Represents NONE. 2178 */ 2179 public static class JCNoType extends Type implements NoType { 2180 public JCNoType() { 2181 // Need to use List.nil(), because JCNoType constructor 2182 // gets called in static initializers in Type, where 2183 // noAnnotations is also defined. 2184 super(null, TypeMetadata.EMPTY); 2185 } 2186 2187 @Override 2188 public JCNoType cloneWithMetadata(TypeMetadata md) { 2189 throw new AssertionError("Cannot add metadata to a JCNoType"); 2190 } 2191 2192 @Override 2193 public TypeTag getTag() { 2194 return NONE; 2195 } 2196 2197 @Override @DefinedBy(Api.LANGUAGE_MODEL) 2198 public TypeKind getKind() { 2199 return TypeKind.NONE; 2200 } 2201 2202 @Override @DefinedBy(Api.LANGUAGE_MODEL) 2203 public <R, P> R accept(TypeVisitor<R, P> v, P p) { 2204 return v.visitNoType(this, p); 2205 } 2206 2207 @Override 2208 public boolean isCompound() { return false; } 2209 } 2210 2211 /** Represents VOID. 2212 */ 2213 public static class JCVoidType extends Type implements NoType { 2214 2215 public JCVoidType() { 2216 // Void cannot be annotated 2217 super(null, TypeMetadata.EMPTY); 2218 } 2219 2220 @Override 2221 public JCVoidType cloneWithMetadata(TypeMetadata md) { 2222 throw new AssertionError("Cannot add metadata to a void type"); 2223 } 2224 2225 @Override 2226 public TypeTag getTag() { 2227 return VOID; 2228 } 2229 2230 @Override @DefinedBy(Api.LANGUAGE_MODEL) 2231 public TypeKind getKind() { 2232 return TypeKind.VOID; 2233 } 2234 2235 @Override 2236 public boolean isCompound() { return false; } 2237 2238 @Override @DefinedBy(Api.LANGUAGE_MODEL) 2239 public <R, P> R accept(TypeVisitor<R, P> v, P p) { 2240 return v.visitNoType(this, p); 2241 } 2242 2243 @Override 2244 public boolean isPrimitiveOrVoid() { 2245 return true; 2246 } 2247 } 2248 2249 static class BottomType extends Type implements NullType { 2250 public BottomType() { 2251 // Bottom is a synthesized internal type, so it cannot be annotated 2252 super(null, TypeMetadata.EMPTY); 2253 } 2254 2255 @Override 2256 public BottomType cloneWithMetadata(TypeMetadata md) { 2257 throw new AssertionError("Cannot add metadata to a bottom type"); 2258 } 2259 2260 @Override 2261 public TypeTag getTag() { 2262 return BOT; 2263 } 2264 2265 @Override @DefinedBy(Api.LANGUAGE_MODEL) 2266 public TypeKind getKind() { 2267 return TypeKind.NULL; 2268 } 2269 2270 @Override 2271 public boolean isCompound() { return false; } 2272 2273 @Override @DefinedBy(Api.LANGUAGE_MODEL) 2274 public <R, P> R accept(TypeVisitor<R, P> v, P p) { 2275 return v.visitNull(this, p); 2276 } 2277 2278 @Override 2279 public Type constType(Object value) { 2280 return this; 2281 } 2282 2283 @Override 2284 public String stringValue() { 2285 return "null"; 2286 } 2287 2288 @Override 2289 public boolean isNullOrReference() { 2290 return true; 2291 } 2292 2293 } 2294 2295 public static class ErrorType extends ClassType 2296 implements javax.lang.model.type.ErrorType { 2297 2298 private Type originalType = null; 2299 2300 public ErrorType(ClassSymbol c, Type originalType) { 2301 this(originalType, c); 2302 c.type = this; 2303 c.kind = ERR; 2304 c.members_field = new Scope.ErrorScope(c); 2305 } 2306 2307 public ErrorType(Type originalType, TypeSymbol tsym) { 2308 super(noType, List.nil(), null); 2309 this.tsym = tsym; 2310 this.originalType = (originalType == null ? noType : originalType); 2311 } 2312 2313 private ErrorType(Type originalType, TypeSymbol tsym, 2314 TypeMetadata metadata) { 2315 super(noType, List.nil(), null, metadata); 2316 this.tsym = tsym; 2317 this.originalType = (originalType == null ? noType : originalType); 2318 } 2319 2320 @Override 2321 public ErrorType cloneWithMetadata(TypeMetadata md) { 2322 return new ErrorType(originalType, tsym, md) { 2323 @Override 2324 public Type baseType() { return ErrorType.this.baseType(); } 2325 }; 2326 } 2327 2328 @Override 2329 public TypeTag getTag() { 2330 return ERROR; 2331 } 2332 2333 @Override 2334 public boolean isPartial() { 2335 return true; 2336 } 2337 2338 @Override 2339 public boolean isReference() { 2340 return true; 2341 } 2342 2343 @Override 2344 public boolean isNullOrReference() { 2345 return true; 2346 } 2347 2348 public ErrorType(Name name, TypeSymbol container, Type originalType) { 2349 this(new ClassSymbol(PUBLIC|STATIC|ACYCLIC, name, null, container), originalType); 2350 } 2351 2352 @Override 2353 public <R,S> R accept(Type.Visitor<R,S> v, S s) { 2354 return v.visitErrorType(this, s); 2355 } 2356 2357 public Type constType(Object constValue) { return this; } 2358 @DefinedBy(Api.LANGUAGE_MODEL) 2359 public Type getEnclosingType() { return this; } 2360 public Type getReturnType() { return this; } 2361 public Type asSub(Symbol sym) { return this; } 2362 2363 public boolean isGenType(Type t) { return true; } 2364 public boolean isErroneous() { return true; } 2365 public boolean isCompound() { return false; } 2366 public boolean isInterface() { return false; } 2367 2368 public List<Type> allparams() { return List.nil(); } 2369 @DefinedBy(Api.LANGUAGE_MODEL) 2370 public List<Type> getTypeArguments() { return List.nil(); } 2371 2372 @DefinedBy(Api.LANGUAGE_MODEL) 2373 public TypeKind getKind() { 2374 return TypeKind.ERROR; 2375 } 2376 2377 public Type getOriginalType() { 2378 return originalType; 2379 } 2380 2381 @DefinedBy(Api.LANGUAGE_MODEL) 2382 public <R, P> R accept(TypeVisitor<R, P> v, P p) { 2383 return v.visitError(this, p); 2384 } 2385 } 2386 2387 public static class UnknownType extends Type { 2388 2389 public UnknownType() { 2390 // Unknown is a synthesized internal type, so it cannot be 2391 // annotated. 2392 super(null, TypeMetadata.EMPTY); 2393 } 2394 2395 @Override 2396 public UnknownType cloneWithMetadata(TypeMetadata md) { 2397 throw new AssertionError("Cannot add metadata to an unknown type"); 2398 } 2399 2400 @Override 2401 public TypeTag getTag() { 2402 return UNKNOWN; 2403 } 2404 2405 @Override @DefinedBy(Api.LANGUAGE_MODEL) 2406 public <R, P> R accept(TypeVisitor<R, P> v, P p) { 2407 return v.visitUnknown(this, p); 2408 } 2409 2410 @Override 2411 public boolean isPartial() { 2412 return true; 2413 } 2414 } 2415 2416 /** 2417 * A visitor for types. A visitor is used to implement operations 2418 * (or relations) on types. Most common operations on types are 2419 * binary relations and this interface is designed for binary 2420 * relations, that is, operations of the form 2421 * Type × S → R. 2422 * <!-- In plain text: Type x S -> R --> 2423 * 2424 * @param <R> the return type of the operation implemented by this 2425 * visitor; use Void if no return type is needed. 2426 * @param <S> the type of the second argument (the first being the 2427 * type itself) of the operation implemented by this visitor; use 2428 * Void if a second argument is not needed. 2429 */ 2430 public interface Visitor<R,S> { 2431 R visitClassType(ClassType t, S s); 2432 R visitWildcardType(WildcardType t, S s); 2433 R visitArrayType(ArrayType t, S s); 2434 R visitMethodType(MethodType t, S s); 2435 R visitPackageType(PackageType t, S s); 2436 R visitModuleType(ModuleType t, S s); 2437 R visitTypeVar(TypeVar t, S s); 2438 R visitCapturedType(CapturedType t, S s); 2439 R visitForAll(ForAll t, S s); 2440 R visitUndetVar(UndetVar t, S s); 2441 R visitErrorType(ErrorType t, S s); 2442 R visitType(Type t, S s); 2443 } 2444} 2445