Mercurial > jdk8-mips64-public > langtools / file revision
src/share/classes/com/sun/tools/javac/code/Type.java@6508d7e812e1
src/share/classes/com/sun/tools/javac/code/Type.java
Thu, 23 Oct 2008 17:59:16 +0100
- author
- mcimadamore
- date
- Thu, 23 Oct 2008 17:59:16 +0100
- changeset 154
- 6508d7e812e1
- parent 113
- eff38cc97183
- child 288
- d402db1005ad
- permissions
- -rw-r--r--
6732484: Bound error on wildcard code
Summary: Check.checkExtends should cope with captured type-variables
Reviewed-by: jjg
1 /*
2 * Copyright 1999-2008 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Sun designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Sun in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
22 * CA 95054 USA or visit www.sun.com if you need additional information or
23 * have any questions.
24 */
26 package com.sun.tools.javac.code;
28 import com.sun.tools.javac.util.*;
29 import com.sun.tools.javac.code.Symbol.*;
31 import javax.lang.model.type.*;
33 import static com.sun.tools.javac.code.Flags.*;
34 import static com.sun.tools.javac.code.Kinds.*;
35 import static com.sun.tools.javac.code.BoundKind.*;
36 import static com.sun.tools.javac.code.TypeTags.*;
38 /** This class represents Java types. The class itself defines the behavior of
39 * the following types:
40 * <pre>
41 * base types (tags: BYTE, CHAR, SHORT, INT, LONG, FLOAT, DOUBLE, BOOLEAN),
42 * type `void' (tag: VOID),
43 * the bottom type (tag: BOT),
44 * the missing type (tag: NONE).
45 * </pre>
46 * <p>The behavior of the following types is defined in subclasses, which are
47 * all static inner classes of this class:
48 * <pre>
49 * class types (tag: CLASS, class: ClassType),
50 * array types (tag: ARRAY, class: ArrayType),
51 * method types (tag: METHOD, class: MethodType),
52 * package types (tag: PACKAGE, class: PackageType),
53 * type variables (tag: TYPEVAR, class: TypeVar),
54 * type arguments (tag: WILDCARD, class: WildcardType),
55 * polymorphic types (tag: FORALL, class: ForAll),
56 * the error type (tag: ERROR, class: ErrorType).
57 * </pre>
58 *
59 * <p><b>This is NOT part of any API supported by Sun Microsystems. If
60 * you write code that depends on this, you do so at your own risk.
61 * This code and its internal interfaces are subject to change or
62 * deletion without notice.</b>
63 *
64 * @see TypeTags
65 */
66 public class Type implements PrimitiveType {
68 /** Constant type: no type at all. */
69 public static final JCNoType noType = new JCNoType(NONE);
71 /** If this switch is turned on, the names of type variables
72 * and anonymous classes are printed with hashcodes appended.
73 */
74 public static boolean moreInfo = false;
76 /** The tag of this type.
77 *
78 * @see TypeTags
79 */
80 public int tag;
82 /** The defining class / interface / package / type variable
83 */
84 public TypeSymbol tsym;
86 /**
87 * The constant value of this type, null if this type does not
88 * have a constant value attribute. Only primitive types and
89 * strings (ClassType) can have a constant value attribute.
90 * @return the constant value attribute of this type
91 */
92 public Object constValue() {
93 return null;
94 }
96 public <R,S> R accept(Type.Visitor<R,S> v, S s) { return v.visitType(this, s); }
98 /** Define a type given its tag and type symbol
99 */
100 public Type(int tag, TypeSymbol tsym) {
101 this.tag = tag;
102 this.tsym = tsym;
103 }
105 /** An abstract class for mappings from types to types
106 */
107 public static abstract class Mapping {
108 private String name;
109 public Mapping(String name) {
110 this.name = name;
111 }
112 public abstract Type apply(Type t);
113 public String toString() {
114 return name;
115 }
116 }
118 /** map a type function over all immediate descendants of this type
119 */
120 public Type map(Mapping f) {
121 return this;
122 }
124 /** map a type function over a list of types
125 */
126 public static List<Type> map(List<Type> ts, Mapping f) {
127 if (ts.nonEmpty()) {
128 List<Type> tail1 = map(ts.tail, f);
129 Type t = f.apply(ts.head);
130 if (tail1 != ts.tail || t != ts.head)
131 return tail1.prepend(t);
132 }
133 return ts;
134 }
136 /** Define a constant type, of the same kind as this type
137 * and with given constant value
138 */
139 public Type constType(Object constValue) {
140 final Object value = constValue;
141 assert tag <= BOOLEAN;
142 return new Type(tag, tsym) {
143 @Override
144 public Object constValue() {
145 return value;
146 }
147 @Override
148 public Type baseType() {
149 return tsym.type;
150 }
151 };
152 }
154 /**
155 * If this is a constant type, return its underlying type.
156 * Otherwise, return the type itself.
157 */
158 public Type baseType() {
159 return this;
160 }
162 /** Return the base types of a list of types.
163 */
164 public static List<Type> baseTypes(List<Type> ts) {
165 if (ts.nonEmpty()) {
166 Type t = ts.head.baseType();
167 List<Type> baseTypes = baseTypes(ts.tail);
168 if (t != ts.head || baseTypes != ts.tail)
169 return baseTypes.prepend(t);
170 }
171 return ts;
172 }
174 /** The Java source which this type represents.
175 */
176 public String toString() {
177 String s = (tsym == null || tsym.name == null)
178 ? "<none>"
179 : tsym.name.toString();
180 if (moreInfo && tag == TYPEVAR) s = s + hashCode();
181 return s;
182 }
184 /**
185 * The Java source which this type list represents. A List is
186 * represented as a comma-spearated listing of the elements in
187 * that list.
188 */
189 public static String toString(List<Type> ts) {
190 if (ts.isEmpty()) {
191 return "";
192 } else {
193 StringBuffer buf = new StringBuffer();
194 buf.append(ts.head.toString());
195 for (List<Type> l = ts.tail; l.nonEmpty(); l = l.tail)
196 buf.append(",").append(l.head.toString());
197 return buf.toString();
198 }
199 }
201 /**
202 * The constant value of this type, converted to String
203 */
204 public String stringValue() {
205 assert constValue() != null;
206 if (tag == BOOLEAN)
207 return ((Integer) constValue()).intValue() == 0 ? "false" : "true";
208 else if (tag == CHAR)
209 return String.valueOf((char) ((Integer) constValue()).intValue());
210 else
211 return constValue().toString();
212 }
214 /**
215 * This method is analogous to isSameType, but weaker, since we
216 * never complete classes. Where isSameType would complete a
217 * class, equals assumes that the two types are different.
218 */
219 public boolean equals(Object t) {
220 return super.equals(t);
221 }
223 public int hashCode() {
224 return super.hashCode();
225 }
227 /** Is this a constant type whose value is false?
228 */
229 public boolean isFalse() {
230 return
231 tag == BOOLEAN &&
232 constValue() != null &&
233 ((Integer)constValue()).intValue() == 0;
234 }
236 /** Is this a constant type whose value is true?
237 */
238 public boolean isTrue() {
239 return
240 tag == BOOLEAN &&
241 constValue() != null &&
242 ((Integer)constValue()).intValue() != 0;
243 }
245 public String argtypes(boolean varargs) {
246 List<Type> args = getParameterTypes();
247 if (!varargs) return args.toString();
248 StringBuffer buf = new StringBuffer();
249 while (args.tail.nonEmpty()) {
250 buf.append(args.head);
251 args = args.tail;
252 buf.append(',');
253 }
254 if (args.head.tag == ARRAY) {
255 buf.append(((ArrayType)args.head).elemtype);
256 buf.append("...");
257 } else {
258 buf.append(args.head);
259 }
260 return buf.toString();
261 }
263 /** Access methods.
264 */
265 public List<Type> getTypeArguments() { return List.nil(); }
266 public Type getEnclosingType() { return null; }
267 public List<Type> getParameterTypes() { return List.nil(); }
268 public Type getReturnType() { return null; }
269 public List<Type> getThrownTypes() { return List.nil(); }
270 public Type getUpperBound() { return null; }
271 public Type getLowerBound() { return null; }
273 public void setThrown(List<Type> ts) {
274 throw new AssertionError();
275 }
277 /** Navigation methods, these will work for classes, type variables,
278 * foralls, but will return null for arrays and methods.
279 */
281 /** Return all parameters of this type and all its outer types in order
282 * outer (first) to inner (last).
283 */
284 public List<Type> allparams() { return List.nil(); }
286 /** Does this type contain "error" elements?
287 */
288 public boolean isErroneous() {
289 return false;
290 }
292 public static boolean isErroneous(List<Type> ts) {
293 for (List<Type> l = ts; l.nonEmpty(); l = l.tail)
294 if (l.head.isErroneous()) return true;
295 return false;
296 }
298 /** Is this type parameterized?
299 * A class type is parameterized if it has some parameters.
300 * An array type is parameterized if its element type is parameterized.
301 * All other types are not parameterized.
302 */
303 public boolean isParameterized() {
304 return false;
305 }
307 /** Is this type a raw type?
308 * A class type is a raw type if it misses some of its parameters.
309 * An array type is a raw type if its element type is raw.
310 * All other types are not raw.
311 * Type validation will ensure that the only raw types
312 * in a program are types that miss all their type variables.
313 */
314 public boolean isRaw() {
315 return false;
316 }
318 public boolean isCompound() {
319 return tsym.completer == null
320 // Compound types can't have a completer. Calling
321 // flags() will complete the symbol causing the
322 // compiler to load classes unnecessarily. This led
323 // to regression 6180021.
324 && (tsym.flags() & COMPOUND) != 0;
325 }
327 public boolean isInterface() {
328 return (tsym.flags() & INTERFACE) != 0;
329 }
331 public boolean isPrimitive() {
332 return tag < VOID;
333 }
335 /**
336 * Does this type contain occurrences of type t?
337 */
338 public boolean contains(Type t) {
339 return t == this;
340 }
342 public static boolean contains(List<Type> ts, Type t) {
343 for (List<Type> l = ts;
344 l.tail != null /*inlined: l.nonEmpty()*/;
345 l = l.tail)
346 if (l.head.contains(t)) return true;
347 return false;
348 }
350 /** Does this type contain an occurrence of some type in `elems'?
351 */
352 public boolean containsSome(List<Type> ts) {
353 for (List<Type> l = ts; l.nonEmpty(); l = l.tail)
354 if (this.contains(ts.head)) return true;
355 return false;
356 }
358 public boolean isSuperBound() { return false; }
359 public boolean isExtendsBound() { return false; }
360 public boolean isUnbound() { return false; }
361 public Type withTypeVar(Type t) { return this; }
363 /** The underlying method type of this type.
364 */
365 public MethodType asMethodType() { throw new AssertionError(); }
367 /** Complete loading all classes in this type.
368 */
369 public void complete() {}
371 public Object clone() {
372 try {
373 return super.clone();
374 } catch (CloneNotSupportedException e) {
375 throw new AssertionError(e);
376 }
377 }
379 public TypeSymbol asElement() {
380 return tsym;
381 }
383 public TypeKind getKind() {
384 switch (tag) {
385 case BYTE: return TypeKind.BYTE;
386 case CHAR: return TypeKind.CHAR;
387 case SHORT: return TypeKind.SHORT;
388 case INT: return TypeKind.INT;
389 case LONG: return TypeKind.LONG;
390 case FLOAT: return TypeKind.FLOAT;
391 case DOUBLE: return TypeKind.DOUBLE;
392 case BOOLEAN: return TypeKind.BOOLEAN;
393 case VOID: return TypeKind.VOID;
394 case BOT: return TypeKind.NULL;
395 case NONE: return TypeKind.NONE;
396 default: return TypeKind.OTHER;
397 }
398 }
400 public <R, P> R accept(TypeVisitor<R, P> v, P p) {
401 if (isPrimitive())
402 return v.visitPrimitive(this, p);
403 else
404 throw new AssertionError();
405 }
407 public static class WildcardType extends Type
408 implements javax.lang.model.type.WildcardType {
410 public Type type;
411 public BoundKind kind;
412 public TypeVar bound;
414 @Override
415 public <R,S> R accept(Type.Visitor<R,S> v, S s) {
416 return v.visitWildcardType(this, s);
417 }
419 public WildcardType(Type type, BoundKind kind, TypeSymbol tsym) {
420 super(WILDCARD, tsym);
421 assert(type != null);
422 this.kind = kind;
423 this.type = type;
424 }
425 public WildcardType(WildcardType t, TypeVar bound) {
426 this(t.type, t.kind, t.tsym, bound);
427 }
429 public WildcardType(Type type, BoundKind kind, TypeSymbol tsym, TypeVar bound) {
430 this(type, kind, tsym);
431 this.bound = bound;
432 }
434 public boolean isSuperBound() {
435 return kind == SUPER ||
436 kind == UNBOUND;
437 }
438 public boolean isExtendsBound() {
439 return kind == EXTENDS ||
440 kind == UNBOUND;
441 }
442 public boolean isUnbound() {
443 return kind == UNBOUND;
444 }
446 public Type withTypeVar(Type t) {
447 //-System.err.println(this+".withTypeVar("+t+");");//DEBUG
448 if (bound == t)
449 return this;
450 bound = (TypeVar)t;
451 return this;
452 }
454 boolean isPrintingBound = false;
455 public String toString() {
456 StringBuffer s = new StringBuffer();
457 s.append(kind.toString());
458 if (kind != UNBOUND)
459 s.append(type);
460 if (moreInfo && bound != null && !isPrintingBound)
461 try {
462 isPrintingBound = true;
463 s.append("{:").append(bound.bound).append(":}");
464 } finally {
465 isPrintingBound = false;
466 }
467 return s.toString();
468 }
470 public Type map(Mapping f) {
471 //- System.err.println(" (" + this + ").map(" + f + ")");//DEBUG
472 Type t = type;
473 if (t != null)
474 t = f.apply(t);
475 if (t == type)
476 return this;
477 else
478 return new WildcardType(t, kind, tsym, bound);
479 }
481 public Type getExtendsBound() {
482 if (kind == EXTENDS)
483 return type;
484 else
485 return null;
486 }
488 public Type getSuperBound() {
489 if (kind == SUPER)
490 return type;
491 else
492 return null;
493 }
495 public TypeKind getKind() {
496 return TypeKind.WILDCARD;
497 }
499 public <R, P> R accept(TypeVisitor<R, P> v, P p) {
500 return v.visitWildcard(this, p);
501 }
502 }
504 public static class ClassType extends Type implements DeclaredType {
506 /** The enclosing type of this type. If this is the type of an inner
507 * class, outer_field refers to the type of its enclosing
508 * instance class, in all other cases it referes to noType.
509 */
510 private Type outer_field;
512 /** The type parameters of this type (to be set once class is loaded).
513 */
514 public List<Type> typarams_field;
516 /** A cache variable for the type parameters of this type,
517 * appended to all parameters of its enclosing class.
518 * @see #allparams
519 */
520 public List<Type> allparams_field;
522 /** The supertype of this class (to be set once class is loaded).
523 */
524 public Type supertype_field;
526 /** The interfaces of this class (to be set once class is loaded).
527 */
528 public List<Type> interfaces_field;
530 public ClassType(Type outer, List<Type> typarams, TypeSymbol tsym) {
531 super(CLASS, tsym);
532 this.outer_field = outer;
533 this.typarams_field = typarams;
534 this.allparams_field = null;
535 this.supertype_field = null;
536 this.interfaces_field = null;
537 /*
538 // this can happen during error recovery
539 assert
540 outer.isParameterized() ?
541 typarams.length() == tsym.type.typarams().length() :
542 outer.isRaw() ?
543 typarams.length() == 0 :
544 true;
545 */
546 }
548 @Override
549 public <R,S> R accept(Type.Visitor<R,S> v, S s) {
550 return v.visitClassType(this, s);
551 }
553 public Type constType(Object constValue) {
554 final Object value = constValue;
555 return new ClassType(getEnclosingType(), typarams_field, tsym) {
556 @Override
557 public Object constValue() {
558 return value;
559 }
560 @Override
561 public Type baseType() {
562 return tsym.type;
563 }
564 };
565 }
567 /** The Java source which this type represents.
568 */
569 public String toString() {
570 StringBuffer buf = new StringBuffer();
571 if (getEnclosingType().tag == CLASS && tsym.owner.kind == TYP) {
572 buf.append(getEnclosingType().toString());
573 buf.append(".");
574 buf.append(className(tsym, false));
575 } else {
576 buf.append(className(tsym, true));
577 }
578 if (getTypeArguments().nonEmpty()) {
579 buf.append('<');
580 buf.append(getTypeArguments().toString());
581 buf.append(">");
582 }
583 return buf.toString();
584 }
585 //where
586 private String className(Symbol sym, boolean longform) {
587 if (sym.name.isEmpty() && (sym.flags() & COMPOUND) != 0) {
588 StringBuffer s = new StringBuffer(supertype_field.toString());
589 for (List<Type> is=interfaces_field; is.nonEmpty(); is = is.tail) {
590 s.append("&");
591 s.append(is.head.toString());
592 }
593 return s.toString();
594 } else if (sym.name.isEmpty()) {
595 String s;
596 ClassType norm = (ClassType) tsym.type;
597 if (norm == null) {
598 s = Log.getLocalizedString("anonymous.class", (Object)null);
599 } else if (norm.interfaces_field != null && norm.interfaces_field.nonEmpty()) {
600 s = Log.getLocalizedString("anonymous.class",
601 norm.interfaces_field.head);
602 } else {
603 s = Log.getLocalizedString("anonymous.class",
604 norm.supertype_field);
605 }
606 if (moreInfo)
607 s += String.valueOf(sym.hashCode());
608 return s;
609 } else if (longform) {
610 return sym.getQualifiedName().toString();
611 } else {
612 return sym.name.toString();
613 }
614 }
616 public List<Type> getTypeArguments() {
617 if (typarams_field == null) {
618 complete();
619 if (typarams_field == null)
620 typarams_field = List.nil();
621 }
622 return typarams_field;
623 }
625 public boolean hasErasedSupertypes() {
626 return isRaw();
627 }
629 public Type getEnclosingType() {
630 return outer_field;
631 }
633 public void setEnclosingType(Type outer) {
634 outer_field = outer;
635 }
637 public List<Type> allparams() {
638 if (allparams_field == null) {
639 allparams_field = getTypeArguments().prependList(getEnclosingType().allparams());
640 }
641 return allparams_field;
642 }
644 public boolean isErroneous() {
645 return
646 getEnclosingType().isErroneous() ||
647 isErroneous(getTypeArguments()) ||
648 this != tsym.type && tsym.type.isErroneous();
649 }
651 public boolean isParameterized() {
652 return allparams().tail != null;
653 // optimization, was: allparams().nonEmpty();
654 }
656 /** A cache for the rank. */
657 int rank_field = -1;
659 /** A class type is raw if it misses some
660 * of its type parameter sections.
661 * After validation, this is equivalent to:
662 * allparams.isEmpty() && tsym.type.allparams.nonEmpty();
663 */
664 public boolean isRaw() {
665 return
666 this != tsym.type && // necessary, but not sufficient condition
667 tsym.type.allparams().nonEmpty() &&
668 allparams().isEmpty();
669 }
671 public Type map(Mapping f) {
672 Type outer = getEnclosingType();
673 Type outer1 = f.apply(outer);
674 List<Type> typarams = getTypeArguments();
675 List<Type> typarams1 = map(typarams, f);
676 if (outer1 == outer && typarams1 == typarams) return this;
677 else return new ClassType(outer1, typarams1, tsym);
678 }
680 public boolean contains(Type elem) {
681 return
682 elem == this
683 || (isParameterized()
684 && (getEnclosingType().contains(elem) || contains(getTypeArguments(), elem)));
685 }
687 public void complete() {
688 if (tsym.completer != null) tsym.complete();
689 }
691 public TypeKind getKind() {
692 return TypeKind.DECLARED;
693 }
695 public <R, P> R accept(TypeVisitor<R, P> v, P p) {
696 return v.visitDeclared(this, p);
697 }
698 }
700 public static class ErasedClassType extends ClassType {
701 public ErasedClassType(Type outer, TypeSymbol tsym) {
702 super(outer, List.<Type>nil(), tsym);
703 }
705 @Override
706 public boolean hasErasedSupertypes() {
707 return true;
708 }
709 }
711 public static class ArrayType extends Type
712 implements javax.lang.model.type.ArrayType {
714 public Type elemtype;
716 public ArrayType(Type elemtype, TypeSymbol arrayClass) {
717 super(ARRAY, arrayClass);
718 this.elemtype = elemtype;
719 }
721 @Override
722 public <R,S> R accept(Type.Visitor<R,S> v, S s) {
723 return v.visitArrayType(this, s);
724 }
726 public String toString() {
727 return elemtype + "[]";
728 }
730 public boolean equals(Object obj) {
731 return
732 this == obj ||
733 (obj instanceof ArrayType &&
734 this.elemtype.equals(((ArrayType)obj).elemtype));
735 }
737 public int hashCode() {
738 return (ARRAY << 5) + elemtype.hashCode();
739 }
741 public List<Type> allparams() { return elemtype.allparams(); }
743 public boolean isErroneous() {
744 return elemtype.isErroneous();
745 }
747 public boolean isParameterized() {
748 return elemtype.isParameterized();
749 }
751 public boolean isRaw() {
752 return elemtype.isRaw();
753 }
755 public Type map(Mapping f) {
756 Type elemtype1 = f.apply(elemtype);
757 if (elemtype1 == elemtype) return this;
758 else return new ArrayType(elemtype1, tsym);
759 }
761 public boolean contains(Type elem) {
762 return elem == this || elemtype.contains(elem);
763 }
765 public void complete() {
766 elemtype.complete();
767 }
769 public Type getComponentType() {
770 return elemtype;
771 }
773 public TypeKind getKind() {
774 return TypeKind.ARRAY;
775 }
777 public <R, P> R accept(TypeVisitor<R, P> v, P p) {
778 return v.visitArray(this, p);
779 }
780 }
782 public static class MethodType extends Type
783 implements Cloneable, ExecutableType {
785 public List<Type> argtypes;
786 public Type restype;
787 public List<Type> thrown;
789 public MethodType(List<Type> argtypes,
790 Type restype,
791 List<Type> thrown,
792 TypeSymbol methodClass) {
793 super(METHOD, methodClass);
794 this.argtypes = argtypes;
795 this.restype = restype;
796 this.thrown = thrown;
797 }
799 @Override
800 public <R,S> R accept(Type.Visitor<R,S> v, S s) {
801 return v.visitMethodType(this, s);
802 }
804 /** The Java source which this type represents.
805 *
806 * XXX 06/09/99 iris This isn't correct Java syntax, but it probably
807 * should be.
808 */
809 public String toString() {
810 return "(" + argtypes + ")" + restype;
811 }
813 public boolean equals(Object obj) {
814 if (this == obj)
815 return true;
816 if (!(obj instanceof MethodType))
817 return false;
818 MethodType m = (MethodType)obj;
819 List<Type> args1 = argtypes;
820 List<Type> args2 = m.argtypes;
821 while (!args1.isEmpty() && !args2.isEmpty()) {
822 if (!args1.head.equals(args2.head))
823 return false;
824 args1 = args1.tail;
825 args2 = args2.tail;
826 }
827 if (!args1.isEmpty() || !args2.isEmpty())
828 return false;
829 return restype.equals(m.restype);
830 }
832 public int hashCode() {
833 int h = METHOD;
834 for (List<Type> thisargs = this.argtypes;
835 thisargs.tail != null; /*inlined: thisargs.nonEmpty()*/
836 thisargs = thisargs.tail)
837 h = (h << 5) + thisargs.head.hashCode();
838 return (h << 5) + this.restype.hashCode();
839 }
841 public List<Type> getParameterTypes() { return argtypes; }
842 public Type getReturnType() { return restype; }
843 public List<Type> getThrownTypes() { return thrown; }
845 public void setThrown(List<Type> t) {
846 thrown = t;
847 }
849 public boolean isErroneous() {
850 return
851 isErroneous(argtypes) ||
852 restype != null && restype.isErroneous();
853 }
855 public Type map(Mapping f) {
856 List<Type> argtypes1 = map(argtypes, f);
857 Type restype1 = f.apply(restype);
858 List<Type> thrown1 = map(thrown, f);
859 if (argtypes1 == argtypes &&
860 restype1 == restype &&
861 thrown1 == thrown) return this;
862 else return new MethodType(argtypes1, restype1, thrown1, tsym);
863 }
865 public boolean contains(Type elem) {
866 return elem == this || contains(argtypes, elem) || restype.contains(elem);
867 }
869 public MethodType asMethodType() { return this; }
871 public void complete() {
872 for (List<Type> l = argtypes; l.nonEmpty(); l = l.tail)
873 l.head.complete();
874 restype.complete();
875 for (List<Type> l = thrown; l.nonEmpty(); l = l.tail)
876 l.head.complete();
877 }
879 public List<TypeVar> getTypeVariables() {
880 return List.nil();
881 }
883 public TypeSymbol asElement() {
884 return null;
885 }
887 public TypeKind getKind() {
888 return TypeKind.EXECUTABLE;
889 }
891 public <R, P> R accept(TypeVisitor<R, P> v, P p) {
892 return v.visitExecutable(this, p);
893 }
894 }
896 public static class PackageType extends Type implements NoType {
898 PackageType(TypeSymbol tsym) {
899 super(PACKAGE, tsym);
900 }
902 @Override
903 public <R,S> R accept(Type.Visitor<R,S> v, S s) {
904 return v.visitPackageType(this, s);
905 }
907 public String toString() {
908 return tsym.getQualifiedName().toString();
909 }
911 public TypeKind getKind() {
912 return TypeKind.PACKAGE;
913 }
915 public <R, P> R accept(TypeVisitor<R, P> v, P p) {
916 return v.visitNoType(this, p);
917 }
918 }
920 public static class TypeVar extends Type implements TypeVariable {
922 /** The bound of this type variable; set from outside.
923 * Must be nonempty once it is set.
924 * For a bound, `bound' is the bound type itself.
925 * Multiple bounds are expressed as a single class type which has the
926 * individual bounds as superclass, respectively interfaces.
927 * The class type then has as `tsym' a compiler generated class `c',
928 * which has a flag COMPOUND and whose owner is the type variable
929 * itself. Furthermore, the erasure_field of the class
930 * points to the first class or interface bound.
931 */
932 public Type bound = null;
933 public Type lower;
935 public TypeVar(Name name, Symbol owner, Type lower) {
936 super(TYPEVAR, null);
937 tsym = new TypeSymbol(0, name, this, owner);
938 this.lower = lower;
939 }
941 public TypeVar(TypeSymbol tsym, Type bound, Type lower) {
942 super(TYPEVAR, tsym);
943 this.bound = bound;
944 this.lower = lower;
945 }
947 @Override
948 public <R,S> R accept(Type.Visitor<R,S> v, S s) {
949 return v.visitTypeVar(this, s);
950 }
952 public Type getUpperBound() { return bound; }
954 int rank_field = -1;
956 public Type getLowerBound() {
957 return lower;
958 }
960 public TypeKind getKind() {
961 return TypeKind.TYPEVAR;
962 }
964 public boolean isCaptured() {
965 return false;
966 }
968 public <R, P> R accept(TypeVisitor<R, P> v, P p) {
969 return v.visitTypeVariable(this, p);
970 }
971 }
973 /** A captured type variable comes from wildcards which can have
974 * both upper and lower bound. CapturedType extends TypeVar with
975 * a lower bound.
976 */
977 public static class CapturedType extends TypeVar {
979 public Type lower;
980 public WildcardType wildcard;
982 public CapturedType(Name name,
983 Symbol owner,
984 Type upper,
985 Type lower,
986 WildcardType wildcard) {
987 super(name, owner, lower);
988 assert lower != null;
989 this.bound = upper;
990 this.lower = lower;
991 this.wildcard = wildcard;
992 }
994 @Override
995 public <R,S> R accept(Type.Visitor<R,S> v, S s) {
996 return v.visitCapturedType(this, s);
997 }
999 public Type getLowerBound() {
1000 return lower;
1001 }
1003 @Override
1004 public boolean isCaptured() {
1005 return true;
1006 }
1008 @Override
1009 public String toString() {
1010 return "capture#"
1011 + (hashCode() & 0xFFFFFFFFL) % PRIME
1012 + " of "
1013 + wildcard;
1014 }
1015 static final int PRIME = 997; // largest prime less than 1000
1016 }
1018 public static abstract class DelegatedType extends Type {
1019 public Type qtype;
1020 public DelegatedType(int tag, Type qtype) {
1021 super(tag, qtype.tsym);
1022 this.qtype = qtype;
1023 }
1024 public String toString() { return qtype.toString(); }
1025 public List<Type> getTypeArguments() { return qtype.getTypeArguments(); }
1026 public Type getEnclosingType() { return qtype.getEnclosingType(); }
1027 public List<Type> getParameterTypes() { return qtype.getParameterTypes(); }
1028 public Type getReturnType() { return qtype.getReturnType(); }
1029 public List<Type> getThrownTypes() { return qtype.getThrownTypes(); }
1030 public List<Type> allparams() { return qtype.allparams(); }
1031 public Type getUpperBound() { return qtype.getUpperBound(); }
1032 public Object clone() { DelegatedType t = (DelegatedType)super.clone(); t.qtype = (Type)qtype.clone(); return t; }
1033 public boolean isErroneous() { return qtype.isErroneous(); }
1034 }
1036 public static class ForAll extends DelegatedType
1037 implements Cloneable, ExecutableType {
1038 public List<Type> tvars;
1040 public ForAll(List<Type> tvars, Type qtype) {
1041 super(FORALL, qtype);
1042 this.tvars = tvars;
1043 }
1045 @Override
1046 public <R,S> R accept(Type.Visitor<R,S> v, S s) {
1047 return v.visitForAll(this, s);
1048 }
1050 public String toString() {
1051 return "<" + tvars + ">" + qtype;
1052 }
1054 public List<Type> getTypeArguments() { return tvars; }
1056 public void setThrown(List<Type> t) {
1057 qtype.setThrown(t);
1058 }
1060 public Object clone() {
1061 ForAll result = (ForAll)super.clone();
1062 result.qtype = (Type)result.qtype.clone();
1063 return result;
1064 }
1066 public boolean isErroneous() {
1067 return qtype.isErroneous();
1068 }
1070 public Type map(Mapping f) {
1071 return f.apply(qtype);
1072 }
1074 public boolean contains(Type elem) {
1075 return qtype.contains(elem);
1076 }
1078 public MethodType asMethodType() {
1079 return qtype.asMethodType();
1080 }
1082 public void complete() {
1083 for (List<Type> l = tvars; l.nonEmpty(); l = l.tail) {
1084 ((TypeVar)l.head).bound.complete();
1085 }
1086 qtype.complete();
1087 }
1089 public List<TypeVar> getTypeVariables() {
1090 return List.convert(TypeVar.class, getTypeArguments());
1091 }
1093 public TypeKind getKind() {
1094 return TypeKind.EXECUTABLE;
1095 }
1097 public <R, P> R accept(TypeVisitor<R, P> v, P p) {
1098 return v.visitExecutable(this, p);
1099 }
1100 }
1102 /** A class for instantiatable variables, for use during type
1103 * inference.
1104 */
1105 public static class UndetVar extends DelegatedType {
1106 public List<Type> lobounds = List.nil();
1107 public List<Type> hibounds = List.nil();
1108 public Type inst = null;
1110 @Override
1111 public <R,S> R accept(Type.Visitor<R,S> v, S s) {
1112 return v.visitUndetVar(this, s);
1113 }
1115 public UndetVar(Type origin) {
1116 super(UNDETVAR, origin);
1117 }
1119 public String toString() {
1120 if (inst != null) return inst.toString();
1121 else return qtype + "?";
1122 }
1124 public Type baseType() {
1125 if (inst != null) return inst.baseType();
1126 else return this;
1127 }
1128 }
1130 /** Represents VOID or NONE.
1131 */
1132 static class JCNoType extends Type implements NoType {
1133 public JCNoType(int tag) {
1134 super(tag, null);
1135 }
1137 @Override
1138 public TypeKind getKind() {
1139 switch (tag) {
1140 case VOID: return TypeKind.VOID;
1141 case NONE: return TypeKind.NONE;
1142 default:
1143 throw new AssertionError("Unexpected tag: " + tag);
1144 }
1145 }
1147 @Override
1148 public <R, P> R accept(TypeVisitor<R, P> v, P p) {
1149 return v.visitNoType(this, p);
1150 }
1151 }
1153 static class BottomType extends Type implements NullType {
1154 public BottomType() {
1155 super(TypeTags.BOT, null);
1156 }
1158 @Override
1159 public TypeKind getKind() {
1160 return TypeKind.NULL;
1161 }
1163 @Override
1164 public <R, P> R accept(TypeVisitor<R, P> v, P p) {
1165 return v.visitNull(this, p);
1166 }
1168 @Override
1169 public Type constType(Object value) {
1170 return this;
1171 }
1173 @Override
1174 public String stringValue() {
1175 return "null";
1176 }
1177 }
1179 public static class ErrorType extends ClassType
1180 implements javax.lang.model.type.ErrorType {
1182 private Type originalType = null;
1184 public ErrorType(Type originalType, TypeSymbol tsym) {
1185 super(noType, List.<Type>nil(), null);
1186 tag = ERROR;
1187 this.tsym = tsym;
1188 this.originalType = (originalType == null ? noType : originalType);
1189 }
1191 public ErrorType(ClassSymbol c, Type originalType) {
1192 this(originalType, c);
1193 c.type = this;
1194 c.kind = ERR;
1195 c.members_field = new Scope.ErrorScope(c);
1196 }
1198 public ErrorType(Name name, TypeSymbol container, Type originalType) {
1199 this(new ClassSymbol(PUBLIC|STATIC|ACYCLIC, name, null, container), originalType);
1200 }
1202 @Override
1203 public <R,S> R accept(Type.Visitor<R,S> v, S s) {
1204 return v.visitErrorType(this, s);
1205 }
1207 public Type constType(Object constValue) { return this; }
1208 public Type getEnclosingType() { return this; }
1209 public Type getReturnType() { return this; }
1210 public Type asSub(Symbol sym) { return this; }
1211 public Type map(Mapping f) { return this; }
1213 public boolean isGenType(Type t) { return true; }
1214 public boolean isErroneous() { return true; }
1215 public boolean isCompound() { return false; }
1216 public boolean isInterface() { return false; }
1218 public List<Type> allparams() { return List.nil(); }
1219 public List<Type> getTypeArguments() { return List.nil(); }
1221 public TypeKind getKind() {
1222 return TypeKind.ERROR;
1223 }
1225 public Type getOriginalType() {
1226 return originalType;
1227 }
1229 public <R, P> R accept(TypeVisitor<R, P> v, P p) {
1230 return v.visitError(this, p);
1231 }
1232 }
1234 /**
1235 * A visitor for types. A visitor is used to implement operations
1236 * (or relations) on types. Most common operations on types are
1237 * binary relations and this interface is designed for binary
1238 * relations, that is, operations on the form
1239 * Type × S → R.
1240 * <!-- In plain text: Type x S -> R -->
1241 *
1242 * @param <R> the return type of the operation implemented by this
1243 * visitor; use Void if no return type is needed.
1244 * @param <S> the type of the second argument (the first being the
1245 * type itself) of the operation implemented by this visitor; use
1246 * Void if a second argument is not needed.
1247 */
1248 public interface Visitor<R,S> {
1249 R visitClassType(ClassType t, S s);
1250 R visitWildcardType(WildcardType t, S s);
1251 R visitArrayType(ArrayType t, S s);
1252 R visitMethodType(MethodType t, S s);
1253 R visitPackageType(PackageType t, S s);
1254 R visitTypeVar(TypeVar t, S s);
1255 R visitCapturedType(CapturedType t, S s);
1256 R visitForAll(ForAll t, S s);
1257 R visitUndetVar(UndetVar t, S s);
1258 R visitErrorType(ErrorType t, S s);
1259 R visitType(Type t, S s);
1260 }
1261 }
