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src/share/classes/com/sun/tools/javac/code/Type.java@7c537f4298fb
src/share/classes/com/sun/tools/javac/code/Type.java
Mon, 10 Jan 2011 15:08:31 -0800
- author
- jjg
- date
- Mon, 10 Jan 2011 15:08:31 -0800
- changeset 816
- 7c537f4298fb
- parent 798
- 4868a36f6fd8
- child 828
- 19c900c703c6
- permissions
- -rw-r--r--
6396503: javac should not require assertions enabled
Reviewed-by: mcimadamore
1 /*
2 * Copyright (c) 1999, 2011, 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 */
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 supported API.
60 * If 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.check(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 Object cv = Assert.checkNonNull(constValue());
206 if (tag == BOOLEAN)
207 return ((Integer) cv).intValue() == 0 ? "false" : "true";
208 else if (tag == CHAR)
209 return String.valueOf((char) ((Integer) cv).intValue());
210 else
211 return cv.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 StringBuilder buf = new StringBuilder();
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 isFinal() {
332 return (tsym.flags() & FINAL) != 0;
333 }
335 public boolean isPrimitive() {
336 return tag < VOID;
337 }
339 /**
340 * Does this type contain occurrences of type t?
341 */
342 public boolean contains(Type t) {
343 return t == this;
344 }
346 public static boolean contains(List<Type> ts, Type t) {
347 for (List<Type> l = ts;
348 l.tail != null /*inlined: l.nonEmpty()*/;
349 l = l.tail)
350 if (l.head.contains(t)) return true;
351 return false;
352 }
354 /** Does this type contain an occurrence of some type in 'ts'?
355 */
356 public boolean containsAny(List<Type> ts) {
357 for (Type t : ts)
358 if (this.contains(t)) return true;
359 return false;
360 }
362 public static boolean containsAny(List<Type> ts1, List<Type> ts2) {
363 for (Type t : ts1)
364 if (t.containsAny(ts2)) return true;
365 return false;
366 }
368 public boolean isSuperBound() { return false; }
369 public boolean isExtendsBound() { return false; }
370 public boolean isUnbound() { return false; }
371 public Type withTypeVar(Type t) { return this; }
373 /** The underlying method type of this type.
374 */
375 public MethodType asMethodType() { throw new AssertionError(); }
377 /** Complete loading all classes in this type.
378 */
379 public void complete() {}
381 public Object clone() {
382 try {
383 return super.clone();
384 } catch (CloneNotSupportedException e) {
385 throw new AssertionError(e);
386 }
387 }
389 public TypeSymbol asElement() {
390 return tsym;
391 }
393 public TypeKind getKind() {
394 switch (tag) {
395 case BYTE: return TypeKind.BYTE;
396 case CHAR: return TypeKind.CHAR;
397 case SHORT: return TypeKind.SHORT;
398 case INT: return TypeKind.INT;
399 case LONG: return TypeKind.LONG;
400 case FLOAT: return TypeKind.FLOAT;
401 case DOUBLE: return TypeKind.DOUBLE;
402 case BOOLEAN: return TypeKind.BOOLEAN;
403 case VOID: return TypeKind.VOID;
404 case BOT: return TypeKind.NULL;
405 case NONE: return TypeKind.NONE;
406 default: return TypeKind.OTHER;
407 }
408 }
410 public <R, P> R accept(TypeVisitor<R, P> v, P p) {
411 if (isPrimitive())
412 return v.visitPrimitive(this, p);
413 else
414 throw new AssertionError();
415 }
417 public static class WildcardType extends Type
418 implements javax.lang.model.type.WildcardType {
420 public Type type;
421 public BoundKind kind;
422 public TypeVar bound;
424 @Override
425 public <R,S> R accept(Type.Visitor<R,S> v, S s) {
426 return v.visitWildcardType(this, s);
427 }
429 public WildcardType(Type type, BoundKind kind, TypeSymbol tsym) {
430 super(WILDCARD, tsym);
431 this.type = Assert.checkNonNull(type);
432 this.kind = kind;
433 }
434 public WildcardType(WildcardType t, TypeVar bound) {
435 this(t.type, t.kind, t.tsym, bound);
436 }
438 public WildcardType(Type type, BoundKind kind, TypeSymbol tsym, TypeVar bound) {
439 this(type, kind, tsym);
440 this.bound = bound;
441 }
443 public boolean contains(Type t) {
444 return kind != UNBOUND && type.contains(t);
445 }
447 public boolean isSuperBound() {
448 return kind == SUPER ||
449 kind == UNBOUND;
450 }
451 public boolean isExtendsBound() {
452 return kind == EXTENDS ||
453 kind == UNBOUND;
454 }
455 public boolean isUnbound() {
456 return kind == UNBOUND;
457 }
459 public Type withTypeVar(Type t) {
460 //-System.err.println(this+".withTypeVar("+t+");");//DEBUG
461 if (bound == t)
462 return this;
463 bound = (TypeVar)t;
464 return this;
465 }
467 boolean isPrintingBound = false;
468 public String toString() {
469 StringBuffer s = new StringBuffer();
470 s.append(kind.toString());
471 if (kind != UNBOUND)
472 s.append(type);
473 if (moreInfo && bound != null && !isPrintingBound)
474 try {
475 isPrintingBound = true;
476 s.append("{:").append(bound.bound).append(":}");
477 } finally {
478 isPrintingBound = false;
479 }
480 return s.toString();
481 }
483 public Type map(Mapping f) {
484 //- System.err.println(" (" + this + ").map(" + f + ")");//DEBUG
485 Type t = type;
486 if (t != null)
487 t = f.apply(t);
488 if (t == type)
489 return this;
490 else
491 return new WildcardType(t, kind, tsym, bound);
492 }
494 public Type getExtendsBound() {
495 if (kind == EXTENDS)
496 return type;
497 else
498 return null;
499 }
501 public Type getSuperBound() {
502 if (kind == SUPER)
503 return type;
504 else
505 return null;
506 }
508 public TypeKind getKind() {
509 return TypeKind.WILDCARD;
510 }
512 public <R, P> R accept(TypeVisitor<R, P> v, P p) {
513 return v.visitWildcard(this, p);
514 }
515 }
517 public static class ClassType extends Type implements DeclaredType {
519 /** The enclosing type of this type. If this is the type of an inner
520 * class, outer_field refers to the type of its enclosing
521 * instance class, in all other cases it referes to noType.
522 */
523 private Type outer_field;
525 /** The type parameters of this type (to be set once class is loaded).
526 */
527 public List<Type> typarams_field;
529 /** A cache variable for the type parameters of this type,
530 * appended to all parameters of its enclosing class.
531 * @see #allparams
532 */
533 public List<Type> allparams_field;
535 /** The supertype of this class (to be set once class is loaded).
536 */
537 public Type supertype_field;
539 /** The interfaces of this class (to be set once class is loaded).
540 */
541 public List<Type> interfaces_field;
543 public ClassType(Type outer, List<Type> typarams, TypeSymbol tsym) {
544 super(CLASS, tsym);
545 this.outer_field = outer;
546 this.typarams_field = typarams;
547 this.allparams_field = null;
548 this.supertype_field = null;
549 this.interfaces_field = null;
550 /*
551 // this can happen during error recovery
552 assert
553 outer.isParameterized() ?
554 typarams.length() == tsym.type.typarams().length() :
555 outer.isRaw() ?
556 typarams.length() == 0 :
557 true;
558 */
559 }
561 @Override
562 public <R,S> R accept(Type.Visitor<R,S> v, S s) {
563 return v.visitClassType(this, s);
564 }
566 public Type constType(Object constValue) {
567 final Object value = constValue;
568 return new ClassType(getEnclosingType(), typarams_field, tsym) {
569 @Override
570 public Object constValue() {
571 return value;
572 }
573 @Override
574 public Type baseType() {
575 return tsym.type;
576 }
577 };
578 }
580 /** The Java source which this type represents.
581 */
582 public String toString() {
583 StringBuffer buf = new StringBuffer();
584 if (getEnclosingType().tag == CLASS && tsym.owner.kind == TYP) {
585 buf.append(getEnclosingType().toString());
586 buf.append(".");
587 buf.append(className(tsym, false));
588 } else {
589 buf.append(className(tsym, true));
590 }
591 if (getTypeArguments().nonEmpty()) {
592 buf.append('<');
593 buf.append(getTypeArguments().toString());
594 buf.append(">");
595 }
596 return buf.toString();
597 }
598 //where
599 private String className(Symbol sym, boolean longform) {
600 if (sym.name.isEmpty() && (sym.flags() & COMPOUND) != 0) {
601 StringBuffer s = new StringBuffer(supertype_field.toString());
602 for (List<Type> is=interfaces_field; is.nonEmpty(); is = is.tail) {
603 s.append("&");
604 s.append(is.head.toString());
605 }
606 return s.toString();
607 } else if (sym.name.isEmpty()) {
608 String s;
609 ClassType norm = (ClassType) tsym.type;
610 if (norm == null) {
611 s = Log.getLocalizedString("anonymous.class", (Object)null);
612 } else if (norm.interfaces_field != null && norm.interfaces_field.nonEmpty()) {
613 s = Log.getLocalizedString("anonymous.class",
614 norm.interfaces_field.head);
615 } else {
616 s = Log.getLocalizedString("anonymous.class",
617 norm.supertype_field);
618 }
619 if (moreInfo)
620 s += String.valueOf(sym.hashCode());
621 return s;
622 } else if (longform) {
623 return sym.getQualifiedName().toString();
624 } else {
625 return sym.name.toString();
626 }
627 }
629 public List<Type> getTypeArguments() {
630 if (typarams_field == null) {
631 complete();
632 if (typarams_field == null)
633 typarams_field = List.nil();
634 }
635 return typarams_field;
636 }
638 public boolean hasErasedSupertypes() {
639 return isRaw();
640 }
642 public Type getEnclosingType() {
643 return outer_field;
644 }
646 public void setEnclosingType(Type outer) {
647 outer_field = outer;
648 }
650 public List<Type> allparams() {
651 if (allparams_field == null) {
652 allparams_field = getTypeArguments().prependList(getEnclosingType().allparams());
653 }
654 return allparams_field;
655 }
657 public boolean isErroneous() {
658 return
659 getEnclosingType().isErroneous() ||
660 isErroneous(getTypeArguments()) ||
661 this != tsym.type && tsym.type.isErroneous();
662 }
664 public boolean isParameterized() {
665 return allparams().tail != null;
666 // optimization, was: allparams().nonEmpty();
667 }
669 /** A cache for the rank. */
670 int rank_field = -1;
672 /** A class type is raw if it misses some
673 * of its type parameter sections.
674 * After validation, this is equivalent to:
675 * allparams.isEmpty() && tsym.type.allparams.nonEmpty();
676 */
677 public boolean isRaw() {
678 return
679 this != tsym.type && // necessary, but not sufficient condition
680 tsym.type.allparams().nonEmpty() &&
681 allparams().isEmpty();
682 }
684 public Type map(Mapping f) {
685 Type outer = getEnclosingType();
686 Type outer1 = f.apply(outer);
687 List<Type> typarams = getTypeArguments();
688 List<Type> typarams1 = map(typarams, f);
689 if (outer1 == outer && typarams1 == typarams) return this;
690 else return new ClassType(outer1, typarams1, tsym);
691 }
693 public boolean contains(Type elem) {
694 return
695 elem == this
696 || (isParameterized()
697 && (getEnclosingType().contains(elem) || contains(getTypeArguments(), elem)))
698 || (isCompound()
699 && (supertype_field.contains(elem) || contains(interfaces_field, elem)));
700 }
702 public void complete() {
703 if (tsym.completer != null) tsym.complete();
704 }
706 public TypeKind getKind() {
707 return TypeKind.DECLARED;
708 }
710 public <R, P> R accept(TypeVisitor<R, P> v, P p) {
711 return v.visitDeclared(this, p);
712 }
713 }
715 public static class ErasedClassType extends ClassType {
716 public ErasedClassType(Type outer, TypeSymbol tsym) {
717 super(outer, List.<Type>nil(), tsym);
718 }
720 @Override
721 public boolean hasErasedSupertypes() {
722 return true;
723 }
724 }
726 public static class ArrayType extends Type
727 implements javax.lang.model.type.ArrayType {
729 public Type elemtype;
731 public ArrayType(Type elemtype, TypeSymbol arrayClass) {
732 super(ARRAY, arrayClass);
733 this.elemtype = elemtype;
734 }
736 @Override
737 public <R,S> R accept(Type.Visitor<R,S> v, S s) {
738 return v.visitArrayType(this, s);
739 }
741 public String toString() {
742 return elemtype + "[]";
743 }
745 public boolean equals(Object obj) {
746 return
747 this == obj ||
748 (obj instanceof ArrayType &&
749 this.elemtype.equals(((ArrayType)obj).elemtype));
750 }
752 public int hashCode() {
753 return (ARRAY << 5) + elemtype.hashCode();
754 }
756 public boolean isVarargs() {
757 return false;
758 }
760 public List<Type> allparams() { return elemtype.allparams(); }
762 public boolean isErroneous() {
763 return elemtype.isErroneous();
764 }
766 public boolean isParameterized() {
767 return elemtype.isParameterized();
768 }
770 public boolean isRaw() {
771 return elemtype.isRaw();
772 }
774 public ArrayType makeVarargs() {
775 return new ArrayType(elemtype, tsym) {
776 @Override
777 public boolean isVarargs() {
778 return true;
779 }
780 };
781 }
783 public Type map(Mapping f) {
784 Type elemtype1 = f.apply(elemtype);
785 if (elemtype1 == elemtype) return this;
786 else return new ArrayType(elemtype1, tsym);
787 }
789 public boolean contains(Type elem) {
790 return elem == this || elemtype.contains(elem);
791 }
793 public void complete() {
794 elemtype.complete();
795 }
797 public Type getComponentType() {
798 return elemtype;
799 }
801 public TypeKind getKind() {
802 return TypeKind.ARRAY;
803 }
805 public <R, P> R accept(TypeVisitor<R, P> v, P p) {
806 return v.visitArray(this, p);
807 }
808 }
810 public static class MethodType extends Type
811 implements Cloneable, ExecutableType {
813 public List<Type> argtypes;
814 public Type restype;
815 public List<Type> thrown;
817 public MethodType(List<Type> argtypes,
818 Type restype,
819 List<Type> thrown,
820 TypeSymbol methodClass) {
821 super(METHOD, methodClass);
822 this.argtypes = argtypes;
823 this.restype = restype;
824 this.thrown = thrown;
825 }
827 @Override
828 public <R,S> R accept(Type.Visitor<R,S> v, S s) {
829 return v.visitMethodType(this, s);
830 }
832 /** The Java source which this type represents.
833 *
834 * XXX 06/09/99 iris This isn't correct Java syntax, but it probably
835 * should be.
836 */
837 public String toString() {
838 return "(" + argtypes + ")" + restype;
839 }
841 public boolean equals(Object obj) {
842 if (this == obj)
843 return true;
844 if (!(obj instanceof MethodType))
845 return false;
846 MethodType m = (MethodType)obj;
847 List<Type> args1 = argtypes;
848 List<Type> args2 = m.argtypes;
849 while (!args1.isEmpty() && !args2.isEmpty()) {
850 if (!args1.head.equals(args2.head))
851 return false;
852 args1 = args1.tail;
853 args2 = args2.tail;
854 }
855 if (!args1.isEmpty() || !args2.isEmpty())
856 return false;
857 return restype.equals(m.restype);
858 }
860 public int hashCode() {
861 int h = METHOD;
862 for (List<Type> thisargs = this.argtypes;
863 thisargs.tail != null; /*inlined: thisargs.nonEmpty()*/
864 thisargs = thisargs.tail)
865 h = (h << 5) + thisargs.head.hashCode();
866 return (h << 5) + this.restype.hashCode();
867 }
869 public List<Type> getParameterTypes() { return argtypes; }
870 public Type getReturnType() { return restype; }
871 public List<Type> getThrownTypes() { return thrown; }
873 public void setThrown(List<Type> t) {
874 thrown = t;
875 }
877 public boolean isErroneous() {
878 return
879 isErroneous(argtypes) ||
880 restype != null && restype.isErroneous();
881 }
883 public Type map(Mapping f) {
884 List<Type> argtypes1 = map(argtypes, f);
885 Type restype1 = f.apply(restype);
886 List<Type> thrown1 = map(thrown, f);
887 if (argtypes1 == argtypes &&
888 restype1 == restype &&
889 thrown1 == thrown) return this;
890 else return new MethodType(argtypes1, restype1, thrown1, tsym);
891 }
893 public boolean contains(Type elem) {
894 return elem == this || contains(argtypes, elem) || restype.contains(elem);
895 }
897 public MethodType asMethodType() { return this; }
899 public void complete() {
900 for (List<Type> l = argtypes; l.nonEmpty(); l = l.tail)
901 l.head.complete();
902 restype.complete();
903 for (List<Type> l = thrown; l.nonEmpty(); l = l.tail)
904 l.head.complete();
905 }
907 public List<TypeVar> getTypeVariables() {
908 return List.nil();
909 }
911 public TypeSymbol asElement() {
912 return null;
913 }
915 public TypeKind getKind() {
916 return TypeKind.EXECUTABLE;
917 }
919 public <R, P> R accept(TypeVisitor<R, P> v, P p) {
920 return v.visitExecutable(this, p);
921 }
922 }
924 public static class PackageType extends Type implements NoType {
926 PackageType(TypeSymbol tsym) {
927 super(PACKAGE, tsym);
928 }
930 @Override
931 public <R,S> R accept(Type.Visitor<R,S> v, S s) {
932 return v.visitPackageType(this, s);
933 }
935 public String toString() {
936 return tsym.getQualifiedName().toString();
937 }
939 public TypeKind getKind() {
940 return TypeKind.PACKAGE;
941 }
943 public <R, P> R accept(TypeVisitor<R, P> v, P p) {
944 return v.visitNoType(this, p);
945 }
946 }
948 public static class TypeVar extends Type implements TypeVariable {
950 /** The upper bound of this type variable; set from outside.
951 * Must be nonempty once it is set.
952 * For a bound, `bound' is the bound type itself.
953 * Multiple bounds are expressed as a single class type which has the
954 * individual bounds as superclass, respectively interfaces.
955 * The class type then has as `tsym' a compiler generated class `c',
956 * which has a flag COMPOUND and whose owner is the type variable
957 * itself. Furthermore, the erasure_field of the class
958 * points to the first class or interface bound.
959 */
960 public Type bound = null;
962 /** The lower bound of this type variable.
963 * TypeVars don't normally have a lower bound, so it is normally set
964 * to syms.botType.
965 * Subtypes, such as CapturedType, may provide a different value.
966 */
967 public Type lower;
969 public TypeVar(Name name, Symbol owner, Type lower) {
970 super(TYPEVAR, null);
971 tsym = new TypeSymbol(0, name, this, owner);
972 this.lower = lower;
973 }
975 public TypeVar(TypeSymbol tsym, Type bound, Type lower) {
976 super(TYPEVAR, tsym);
977 this.bound = bound;
978 this.lower = lower;
979 }
981 @Override
982 public <R,S> R accept(Type.Visitor<R,S> v, S s) {
983 return v.visitTypeVar(this, s);
984 }
986 @Override
987 public Type getUpperBound() { return bound; }
989 int rank_field = -1;
991 @Override
992 public Type getLowerBound() {
993 return lower;
994 }
996 public TypeKind getKind() {
997 return TypeKind.TYPEVAR;
998 }
1000 public boolean isCaptured() {
1001 return false;
1002 }
1004 public <R, P> R accept(TypeVisitor<R, P> v, P p) {
1005 return v.visitTypeVariable(this, p);
1006 }
1007 }
1009 /** A captured type variable comes from wildcards which can have
1010 * both upper and lower bound. CapturedType extends TypeVar with
1011 * a lower bound.
1012 */
1013 public static class CapturedType extends TypeVar {
1015 public WildcardType wildcard;
1017 public CapturedType(Name name,
1018 Symbol owner,
1019 Type upper,
1020 Type lower,
1021 WildcardType wildcard) {
1022 super(name, owner, lower);
1023 this.lower = Assert.checkNonNull(lower);
1024 this.bound = upper;
1025 this.wildcard = wildcard;
1026 }
1028 @Override
1029 public <R,S> R accept(Type.Visitor<R,S> v, S s) {
1030 return v.visitCapturedType(this, s);
1031 }
1033 @Override
1034 public boolean isCaptured() {
1035 return true;
1036 }
1038 @Override
1039 public String toString() {
1040 return "capture#"
1041 + (hashCode() & 0xFFFFFFFFL) % Printer.PRIME
1042 + " of "
1043 + wildcard;
1044 }
1045 }
1047 public static abstract class DelegatedType extends Type {
1048 public Type qtype;
1049 public DelegatedType(int tag, Type qtype) {
1050 super(tag, qtype.tsym);
1051 this.qtype = qtype;
1052 }
1053 public String toString() { return qtype.toString(); }
1054 public List<Type> getTypeArguments() { return qtype.getTypeArguments(); }
1055 public Type getEnclosingType() { return qtype.getEnclosingType(); }
1056 public List<Type> getParameterTypes() { return qtype.getParameterTypes(); }
1057 public Type getReturnType() { return qtype.getReturnType(); }
1058 public List<Type> getThrownTypes() { return qtype.getThrownTypes(); }
1059 public List<Type> allparams() { return qtype.allparams(); }
1060 public Type getUpperBound() { return qtype.getUpperBound(); }
1061 public Object clone() { DelegatedType t = (DelegatedType)super.clone(); t.qtype = (Type)qtype.clone(); return t; }
1062 public boolean isErroneous() { return qtype.isErroneous(); }
1063 }
1065 public static class ForAll extends DelegatedType
1066 implements Cloneable, ExecutableType {
1067 public List<Type> tvars;
1069 public ForAll(List<Type> tvars, Type qtype) {
1070 super(FORALL, qtype);
1071 this.tvars = tvars;
1072 }
1074 @Override
1075 public <R,S> R accept(Type.Visitor<R,S> v, S s) {
1076 return v.visitForAll(this, s);
1077 }
1079 public String toString() {
1080 return "<" + tvars + ">" + qtype;
1081 }
1083 public List<Type> getTypeArguments() { return tvars; }
1085 public void setThrown(List<Type> t) {
1086 qtype.setThrown(t);
1087 }
1089 public Object clone() {
1090 ForAll result = (ForAll)super.clone();
1091 result.qtype = (Type)result.qtype.clone();
1092 return result;
1093 }
1095 public boolean isErroneous() {
1096 return qtype.isErroneous();
1097 }
1099 /**
1100 * Replaces this ForAll's typevars with a set of concrete Java types
1101 * and returns the instantiated generic type. Subclasses should override
1102 * in order to check that the list of types is a valid instantiation
1103 * of the ForAll's typevars.
1104 *
1105 * @param actuals list of actual types
1106 * @param types types instance
1107 * @return qtype where all occurrences of tvars are replaced
1108 * by types in actuals
1109 */
1110 public Type inst(List<Type> actuals, Types types) {
1111 return types.subst(qtype, tvars, actuals);
1112 }
1114 /**
1115 * Kind of type-constraint derived during type inference
1116 */
1117 public enum ConstraintKind {
1118 /**
1119 * upper bound constraint (a type variable must be instantiated
1120 * with a type T, where T is a subtype of all the types specified by
1121 * its EXTENDS constraints).
1122 */
1123 EXTENDS,
1124 /**
1125 * lower bound constraint (a type variable must be instantiated
1126 * with a type T, where T is a supertype of all the types specified by
1127 * its SUPER constraints).
1128 */
1129 SUPER,
1130 /**
1131 * equality constraint (a type variable must be instantiated to the type
1132 * specified by its EQUAL constraint.
1133 */
1134 EQUAL;
1135 }
1137 /**
1138 * Get the type-constraints of a given kind for a given type-variable of
1139 * this ForAll type. Subclasses should override in order to return more
1140 * accurate sets of constraints.
1141 *
1142 * @param tv the type-variable for which the constraint is to be retrieved
1143 * @param ck the constraint kind to be retrieved
1144 * @return the list of types specified by the selected constraint
1145 */
1146 public List<Type> getConstraints(TypeVar tv, ConstraintKind ck) {
1147 return List.nil();
1148 }
1150 public Type map(Mapping f) {
1151 return f.apply(qtype);
1152 }
1154 public boolean contains(Type elem) {
1155 return qtype.contains(elem);
1156 }
1158 public MethodType asMethodType() {
1159 return qtype.asMethodType();
1160 }
1162 public void complete() {
1163 for (List<Type> l = tvars; l.nonEmpty(); l = l.tail) {
1164 ((TypeVar)l.head).bound.complete();
1165 }
1166 qtype.complete();
1167 }
1169 public List<TypeVar> getTypeVariables() {
1170 return List.convert(TypeVar.class, getTypeArguments());
1171 }
1173 public TypeKind getKind() {
1174 return TypeKind.EXECUTABLE;
1175 }
1177 public <R, P> R accept(TypeVisitor<R, P> v, P p) {
1178 return v.visitExecutable(this, p);
1179 }
1180 }
1182 /** A class for instantiatable variables, for use during type
1183 * inference.
1184 */
1185 public static class UndetVar extends DelegatedType {
1186 public List<Type> lobounds = List.nil();
1187 public List<Type> hibounds = List.nil();
1188 public Type inst = null;
1190 @Override
1191 public <R,S> R accept(Type.Visitor<R,S> v, S s) {
1192 return v.visitUndetVar(this, s);
1193 }
1195 public UndetVar(Type origin) {
1196 super(UNDETVAR, origin);
1197 }
1199 public String toString() {
1200 if (inst != null) return inst.toString();
1201 else return qtype + "?";
1202 }
1204 public Type baseType() {
1205 if (inst != null) return inst.baseType();
1206 else return this;
1207 }
1208 }
1210 /** Represents VOID or NONE.
1211 */
1212 static class JCNoType extends Type implements NoType {
1213 public JCNoType(int tag) {
1214 super(tag, null);
1215 }
1217 @Override
1218 public TypeKind getKind() {
1219 switch (tag) {
1220 case VOID: return TypeKind.VOID;
1221 case NONE: return TypeKind.NONE;
1222 default:
1223 throw new AssertionError("Unexpected tag: " + tag);
1224 }
1225 }
1227 @Override
1228 public <R, P> R accept(TypeVisitor<R, P> v, P p) {
1229 return v.visitNoType(this, p);
1230 }
1231 }
1233 static class BottomType extends Type implements NullType {
1234 public BottomType() {
1235 super(TypeTags.BOT, null);
1236 }
1238 @Override
1239 public TypeKind getKind() {
1240 return TypeKind.NULL;
1241 }
1243 @Override
1244 public <R, P> R accept(TypeVisitor<R, P> v, P p) {
1245 return v.visitNull(this, p);
1246 }
1248 @Override
1249 public Type constType(Object value) {
1250 return this;
1251 }
1253 @Override
1254 public String stringValue() {
1255 return "null";
1256 }
1257 }
1259 public static class ErrorType extends ClassType
1260 implements javax.lang.model.type.ErrorType {
1262 private Type originalType = null;
1264 public ErrorType(Type originalType, TypeSymbol tsym) {
1265 super(noType, List.<Type>nil(), null);
1266 tag = ERROR;
1267 this.tsym = tsym;
1268 this.originalType = (originalType == null ? noType : originalType);
1269 }
1271 public ErrorType(ClassSymbol c, Type originalType) {
1272 this(originalType, c);
1273 c.type = this;
1274 c.kind = ERR;
1275 c.members_field = new Scope.ErrorScope(c);
1276 }
1278 public ErrorType(Name name, TypeSymbol container, Type originalType) {
1279 this(new ClassSymbol(PUBLIC|STATIC|ACYCLIC, name, null, container), originalType);
1280 }
1282 @Override
1283 public <R,S> R accept(Type.Visitor<R,S> v, S s) {
1284 return v.visitErrorType(this, s);
1285 }
1287 public Type constType(Object constValue) { return this; }
1288 public Type getEnclosingType() { return this; }
1289 public Type getReturnType() { return this; }
1290 public Type asSub(Symbol sym) { return this; }
1291 public Type map(Mapping f) { return this; }
1293 public boolean isGenType(Type t) { return true; }
1294 public boolean isErroneous() { return true; }
1295 public boolean isCompound() { return false; }
1296 public boolean isInterface() { return false; }
1298 public List<Type> allparams() { return List.nil(); }
1299 public List<Type> getTypeArguments() { return List.nil(); }
1301 public TypeKind getKind() {
1302 return TypeKind.ERROR;
1303 }
1305 public Type getOriginalType() {
1306 return originalType;
1307 }
1309 public <R, P> R accept(TypeVisitor<R, P> v, P p) {
1310 return v.visitError(this, p);
1311 }
1312 }
1314 /**
1315 * A visitor for types. A visitor is used to implement operations
1316 * (or relations) on types. Most common operations on types are
1317 * binary relations and this interface is designed for binary
1318 * relations, that is, operations on the form
1319 * Type × S → R.
1320 * <!-- In plain text: Type x S -> R -->
1321 *
1322 * @param <R> the return type of the operation implemented by this
1323 * visitor; use Void if no return type is needed.
1324 * @param <S> the type of the second argument (the first being the
1325 * type itself) of the operation implemented by this visitor; use
1326 * Void if a second argument is not needed.
1327 */
1328 public interface Visitor<R,S> {
1329 R visitClassType(ClassType t, S s);
1330 R visitWildcardType(WildcardType t, S s);
1331 R visitArrayType(ArrayType t, S s);
1332 R visitMethodType(MethodType t, S s);
1333 R visitPackageType(PackageType t, S s);
1334 R visitTypeVar(TypeVar t, S s);
1335 R visitCapturedType(CapturedType t, S s);
1336 R visitForAll(ForAll t, S s);
1337 R visitUndetVar(UndetVar t, S s);
1338 R visitErrorType(ErrorType t, S s);
1339 R visitType(Type t, S s);
1340 }
1341 }
