Mercurial > jdk8-mips64-public > langtools / file revision
src/share/classes/com/sun/tools/javac/comp/Check.java@4b4e282a3146
src/share/classes/com/sun/tools/javac/comp/Check.java
Thu, 04 Feb 2010 10:14:28 -0800
- author
- jjg
- date
- Thu, 04 Feb 2010 10:14:28 -0800
- changeset 489
- 4b4e282a3146
- parent 479
- da0e3e2dd3ef
- child 505
- 87eb6edd4f21
- permissions
- -rw-r--r--
6923080: TreeScanner.visitNewClass should scan tree.typeargs
Reviewed-by: darcy
1 /*
2 * Copyright 1999-2009 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.comp;
28 import java.util.*;
29 import java.util.Set;
31 import com.sun.tools.javac.code.*;
32 import com.sun.tools.javac.jvm.*;
33 import com.sun.tools.javac.tree.*;
34 import com.sun.tools.javac.util.*;
35 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
36 import com.sun.tools.javac.util.List;
38 import com.sun.tools.javac.tree.JCTree.*;
39 import com.sun.tools.javac.code.Lint;
40 import com.sun.tools.javac.code.Lint.LintCategory;
41 import com.sun.tools.javac.code.Type.*;
42 import com.sun.tools.javac.code.Symbol.*;
44 import static com.sun.tools.javac.code.Flags.*;
45 import static com.sun.tools.javac.code.Kinds.*;
46 import static com.sun.tools.javac.code.TypeTags.*;
48 /** Type checking helper class for the attribution phase.
49 *
50 * <p><b>This is NOT part of any API supported by Sun Microsystems. If
51 * you write code that depends on this, you do so at your own risk.
52 * This code and its internal interfaces are subject to change or
53 * deletion without notice.</b>
54 */
55 public class Check {
56 protected static final Context.Key<Check> checkKey =
57 new Context.Key<Check>();
59 private final Names names;
60 private final Log log;
61 private final Symtab syms;
62 private final Infer infer;
63 private final Types types;
64 private final JCDiagnostic.Factory diags;
65 private final boolean skipAnnotations;
66 private boolean warnOnSyntheticConflicts;
67 private final TreeInfo treeinfo;
69 // The set of lint options currently in effect. It is initialized
70 // from the context, and then is set/reset as needed by Attr as it
71 // visits all the various parts of the trees during attribution.
72 private Lint lint;
74 public static Check instance(Context context) {
75 Check instance = context.get(checkKey);
76 if (instance == null)
77 instance = new Check(context);
78 return instance;
79 }
81 protected Check(Context context) {
82 context.put(checkKey, this);
84 names = Names.instance(context);
85 log = Log.instance(context);
86 syms = Symtab.instance(context);
87 infer = Infer.instance(context);
88 this.types = Types.instance(context);
89 diags = JCDiagnostic.Factory.instance(context);
90 Options options = Options.instance(context);
91 lint = Lint.instance(context);
92 treeinfo = TreeInfo.instance(context);
94 Source source = Source.instance(context);
95 allowGenerics = source.allowGenerics();
96 allowAnnotations = source.allowAnnotations();
97 allowCovariantReturns = source.allowCovariantReturns();
98 complexInference = options.get("-complexinference") != null;
99 skipAnnotations = options.get("skipAnnotations") != null;
100 warnOnSyntheticConflicts = options.get("warnOnSyntheticConflicts") != null;
102 Target target = Target.instance(context);
103 syntheticNameChar = target.syntheticNameChar();
105 boolean verboseDeprecated = lint.isEnabled(LintCategory.DEPRECATION);
106 boolean verboseUnchecked = lint.isEnabled(LintCategory.UNCHECKED);
107 boolean verboseSunApi = lint.isEnabled(LintCategory.SUNAPI);
108 boolean enforceMandatoryWarnings = source.enforceMandatoryWarnings();
110 deprecationHandler = new MandatoryWarningHandler(log, verboseDeprecated,
111 enforceMandatoryWarnings, "deprecated");
112 uncheckedHandler = new MandatoryWarningHandler(log, verboseUnchecked,
113 enforceMandatoryWarnings, "unchecked");
114 sunApiHandler = new MandatoryWarningHandler(log, verboseSunApi,
115 enforceMandatoryWarnings, "sunapi");
116 }
118 /** Switch: generics enabled?
119 */
120 boolean allowGenerics;
122 /** Switch: annotations enabled?
123 */
124 boolean allowAnnotations;
126 /** Switch: covariant returns enabled?
127 */
128 boolean allowCovariantReturns;
130 /** Switch: -complexinference option set?
131 */
132 boolean complexInference;
134 /** Character for synthetic names
135 */
136 char syntheticNameChar;
138 /** A table mapping flat names of all compiled classes in this run to their
139 * symbols; maintained from outside.
140 */
141 public Map<Name,ClassSymbol> compiled = new HashMap<Name, ClassSymbol>();
143 /** A handler for messages about deprecated usage.
144 */
145 private MandatoryWarningHandler deprecationHandler;
147 /** A handler for messages about unchecked or unsafe usage.
148 */
149 private MandatoryWarningHandler uncheckedHandler;
151 /** A handler for messages about using Sun proprietary API.
152 */
153 private MandatoryWarningHandler sunApiHandler;
155 /* *************************************************************************
156 * Errors and Warnings
157 **************************************************************************/
159 Lint setLint(Lint newLint) {
160 Lint prev = lint;
161 lint = newLint;
162 return prev;
163 }
165 /** Warn about deprecated symbol.
166 * @param pos Position to be used for error reporting.
167 * @param sym The deprecated symbol.
168 */
169 void warnDeprecated(DiagnosticPosition pos, Symbol sym) {
170 if (!lint.isSuppressed(LintCategory.DEPRECATION))
171 deprecationHandler.report(pos, "has.been.deprecated", sym, sym.location());
172 }
174 /** Warn about unchecked operation.
175 * @param pos Position to be used for error reporting.
176 * @param msg A string describing the problem.
177 */
178 public void warnUnchecked(DiagnosticPosition pos, String msg, Object... args) {
179 if (!lint.isSuppressed(LintCategory.UNCHECKED))
180 uncheckedHandler.report(pos, msg, args);
181 }
183 /** Warn about using Sun proprietary API.
184 * @param pos Position to be used for error reporting.
185 * @param msg A string describing the problem.
186 */
187 public void warnSunApi(DiagnosticPosition pos, String msg, Object... args) {
188 if (!lint.isSuppressed(LintCategory.SUNAPI))
189 sunApiHandler.report(pos, msg, args);
190 }
192 /**
193 * Report any deferred diagnostics.
194 */
195 public void reportDeferredDiagnostics() {
196 deprecationHandler.reportDeferredDiagnostic();
197 uncheckedHandler.reportDeferredDiagnostic();
198 sunApiHandler.reportDeferredDiagnostic();
199 }
202 /** Report a failure to complete a class.
203 * @param pos Position to be used for error reporting.
204 * @param ex The failure to report.
205 */
206 public Type completionError(DiagnosticPosition pos, CompletionFailure ex) {
207 log.error(pos, "cant.access", ex.sym, ex.getDetailValue());
208 if (ex instanceof ClassReader.BadClassFile) throw new Abort();
209 else return syms.errType;
210 }
212 /** Report a type error.
213 * @param pos Position to be used for error reporting.
214 * @param problem A string describing the error.
215 * @param found The type that was found.
216 * @param req The type that was required.
217 */
218 Type typeError(DiagnosticPosition pos, Object problem, Type found, Type req) {
219 log.error(pos, "prob.found.req",
220 problem, found, req);
221 return types.createErrorType(found);
222 }
224 Type typeError(DiagnosticPosition pos, String problem, Type found, Type req, Object explanation) {
225 log.error(pos, "prob.found.req.1", problem, found, req, explanation);
226 return types.createErrorType(found);
227 }
229 /** Report an error that wrong type tag was found.
230 * @param pos Position to be used for error reporting.
231 * @param required An internationalized string describing the type tag
232 * required.
233 * @param found The type that was found.
234 */
235 Type typeTagError(DiagnosticPosition pos, Object required, Object found) {
236 // this error used to be raised by the parser,
237 // but has been delayed to this point:
238 if (found instanceof Type && ((Type)found).tag == VOID) {
239 log.error(pos, "illegal.start.of.type");
240 return syms.errType;
241 }
242 log.error(pos, "type.found.req", found, required);
243 return types.createErrorType(found instanceof Type ? (Type)found : syms.errType);
244 }
246 /** Report an error that symbol cannot be referenced before super
247 * has been called.
248 * @param pos Position to be used for error reporting.
249 * @param sym The referenced symbol.
250 */
251 void earlyRefError(DiagnosticPosition pos, Symbol sym) {
252 log.error(pos, "cant.ref.before.ctor.called", sym);
253 }
255 /** Report duplicate declaration error.
256 */
257 void duplicateError(DiagnosticPosition pos, Symbol sym) {
258 if (!sym.type.isErroneous()) {
259 log.error(pos, "already.defined", sym, sym.location());
260 }
261 }
263 /** Report array/varargs duplicate declaration
264 */
265 void varargsDuplicateError(DiagnosticPosition pos, Symbol sym1, Symbol sym2) {
266 if (!sym1.type.isErroneous() && !sym2.type.isErroneous()) {
267 log.error(pos, "array.and.varargs", sym1, sym2, sym2.location());
268 }
269 }
271 /* ************************************************************************
272 * duplicate declaration checking
273 *************************************************************************/
275 /** Check that variable does not hide variable with same name in
276 * immediately enclosing local scope.
277 * @param pos Position for error reporting.
278 * @param v The symbol.
279 * @param s The scope.
280 */
281 void checkTransparentVar(DiagnosticPosition pos, VarSymbol v, Scope s) {
282 if (s.next != null) {
283 for (Scope.Entry e = s.next.lookup(v.name);
284 e.scope != null && e.sym.owner == v.owner;
285 e = e.next()) {
286 if (e.sym.kind == VAR &&
287 (e.sym.owner.kind & (VAR | MTH)) != 0 &&
288 v.name != names.error) {
289 duplicateError(pos, e.sym);
290 return;
291 }
292 }
293 }
294 }
296 /** Check that a class or interface does not hide a class or
297 * interface with same name in immediately enclosing local scope.
298 * @param pos Position for error reporting.
299 * @param c The symbol.
300 * @param s The scope.
301 */
302 void checkTransparentClass(DiagnosticPosition pos, ClassSymbol c, Scope s) {
303 if (s.next != null) {
304 for (Scope.Entry e = s.next.lookup(c.name);
305 e.scope != null && e.sym.owner == c.owner;
306 e = e.next()) {
307 if (e.sym.kind == TYP &&
308 (e.sym.owner.kind & (VAR | MTH)) != 0 &&
309 c.name != names.error) {
310 duplicateError(pos, e.sym);
311 return;
312 }
313 }
314 }
315 }
317 /** Check that class does not have the same name as one of
318 * its enclosing classes, or as a class defined in its enclosing scope.
319 * return true if class is unique in its enclosing scope.
320 * @param pos Position for error reporting.
321 * @param name The class name.
322 * @param s The enclosing scope.
323 */
324 boolean checkUniqueClassName(DiagnosticPosition pos, Name name, Scope s) {
325 for (Scope.Entry e = s.lookup(name); e.scope == s; e = e.next()) {
326 if (e.sym.kind == TYP && e.sym.name != names.error) {
327 duplicateError(pos, e.sym);
328 return false;
329 }
330 }
331 for (Symbol sym = s.owner; sym != null; sym = sym.owner) {
332 if (sym.kind == TYP && sym.name == name && sym.name != names.error) {
333 duplicateError(pos, sym);
334 return true;
335 }
336 }
337 return true;
338 }
340 /* *************************************************************************
341 * Class name generation
342 **************************************************************************/
344 /** Return name of local class.
345 * This is of the form <enclClass> $ n <classname>
346 * where
347 * enclClass is the flat name of the enclosing class,
348 * classname is the simple name of the local class
349 */
350 Name localClassName(ClassSymbol c) {
351 for (int i=1; ; i++) {
352 Name flatname = names.
353 fromString("" + c.owner.enclClass().flatname +
354 syntheticNameChar + i +
355 c.name);
356 if (compiled.get(flatname) == null) return flatname;
357 }
358 }
360 /* *************************************************************************
361 * Type Checking
362 **************************************************************************/
364 /** Check that a given type is assignable to a given proto-type.
365 * If it is, return the type, otherwise return errType.
366 * @param pos Position to be used for error reporting.
367 * @param found The type that was found.
368 * @param req The type that was required.
369 */
370 Type checkType(DiagnosticPosition pos, Type found, Type req) {
371 if (req.tag == ERROR)
372 return req;
373 if (req.tag == NONE)
374 return found;
375 if (types.isAssignable(found, req, convertWarner(pos, found, req)))
376 return found;
377 if (found.tag <= DOUBLE && req.tag <= DOUBLE)
378 return typeError(pos, diags.fragment("possible.loss.of.precision"), found, req);
379 if (found.isSuperBound()) {
380 log.error(pos, "assignment.from.super-bound", found);
381 return types.createErrorType(found);
382 }
383 if (req.isExtendsBound()) {
384 log.error(pos, "assignment.to.extends-bound", req);
385 return types.createErrorType(found);
386 }
387 return typeError(pos, diags.fragment("incompatible.types"), found, req);
388 }
390 Type checkReturnType(DiagnosticPosition pos, Type found, Type req) {
391 if (found.tag == FORALL) {
392 try {
393 return instantiatePoly(pos, (ForAll) found, req, convertWarner(pos, found, req));
394 } catch (Infer.NoInstanceException ex) {
395 if (ex.isAmbiguous) {
396 JCDiagnostic d = ex.getDiagnostic();
397 log.error(pos,
398 "undetermined.type" + (d != null ? ".1" : ""),
399 found, d);
400 return types.createErrorType(req);
401 } else {
402 JCDiagnostic d = ex.getDiagnostic();
403 return typeError(pos,
404 diags.fragment("incompatible.types" + (d != null ? ".1" : ""), d),
405 found, req);
406 }
407 } catch (Infer.InvalidInstanceException ex) {
408 JCDiagnostic d = ex.getDiagnostic();
409 log.error(pos, "invalid.inferred.types", ((ForAll)found).tvars, d);
410 return types.createErrorType(req);
411 }
412 } else {
413 return checkType(pos, found, req);
414 }
415 }
417 /** Instantiate polymorphic type to some prototype, unless
418 * prototype is `anyPoly' in which case polymorphic type
419 * is returned unchanged.
420 */
421 Type instantiatePoly(DiagnosticPosition pos, ForAll t, Type pt, Warner warn) throws Infer.NoInstanceException {
422 if (pt == Infer.anyPoly && complexInference) {
423 return t;
424 } else if (pt == Infer.anyPoly || pt.tag == NONE) {
425 Type newpt = t.qtype.tag <= VOID ? t.qtype : syms.objectType;
426 return instantiatePoly(pos, t, newpt, warn);
427 } else if (pt.tag == ERROR) {
428 return pt;
429 } else {
430 return infer.instantiateExpr(t, pt, warn);
431 }
432 }
434 /** Check that a given type can be cast to a given target type.
435 * Return the result of the cast.
436 * @param pos Position to be used for error reporting.
437 * @param found The type that is being cast.
438 * @param req The target type of the cast.
439 */
440 Type checkCastable(DiagnosticPosition pos, Type found, Type req) {
441 if (found.tag == FORALL) {
442 instantiatePoly(pos, (ForAll) found, req, castWarner(pos, found, req));
443 return req;
444 } else if (types.isCastable(found, req, castWarner(pos, found, req))) {
445 return req;
446 } else {
447 return typeError(pos,
448 diags.fragment("inconvertible.types"),
449 found, req);
450 }
451 }
452 //where
453 /** Is type a type variable, or a (possibly multi-dimensional) array of
454 * type variables?
455 */
456 boolean isTypeVar(Type t) {
457 return t.tag == TYPEVAR || t.tag == ARRAY && isTypeVar(types.elemtype(t));
458 }
460 /** Check that a type is within some bounds.
461 *
462 * Used in TypeApply to verify that, e.g., X in V<X> is a valid
463 * type argument.
464 * @param pos Position to be used for error reporting.
465 * @param a The type that should be bounded by bs.
466 * @param bs The bound.
467 */
468 private void checkExtends(DiagnosticPosition pos, Type a, TypeVar bs) {
469 if (a.isUnbound()) {
470 return;
471 } else if (a.tag != WILDCARD) {
472 a = types.upperBound(a);
473 for (List<Type> l = types.getBounds(bs); l.nonEmpty(); l = l.tail) {
474 if (!types.isSubtype(a, l.head)) {
475 log.error(pos, "not.within.bounds", a);
476 return;
477 }
478 }
479 } else if (a.isExtendsBound()) {
480 if (!types.isCastable(bs.getUpperBound(), types.upperBound(a), Warner.noWarnings))
481 log.error(pos, "not.within.bounds", a);
482 } else if (a.isSuperBound()) {
483 if (types.notSoftSubtype(types.lowerBound(a), bs.getUpperBound()))
484 log.error(pos, "not.within.bounds", a);
485 }
486 }
488 /** Check that a type is within some bounds.
489 *
490 * Used in TypeApply to verify that, e.g., X in V<X> is a valid
491 * type argument.
492 * @param pos Position to be used for error reporting.
493 * @param a The type that should be bounded by bs.
494 * @param bs The bound.
495 */
496 private void checkCapture(JCTypeApply tree) {
497 List<JCExpression> args = tree.getTypeArguments();
498 for (Type arg : types.capture(tree.type).getTypeArguments()) {
499 if (arg.tag == TYPEVAR && arg.getUpperBound().isErroneous()) {
500 log.error(args.head.pos, "not.within.bounds", args.head.type);
501 break;
502 }
503 args = args.tail;
504 }
505 }
507 /** Check that type is different from 'void'.
508 * @param pos Position to be used for error reporting.
509 * @param t The type to be checked.
510 */
511 Type checkNonVoid(DiagnosticPosition pos, Type t) {
512 if (t.tag == VOID) {
513 log.error(pos, "void.not.allowed.here");
514 return types.createErrorType(t);
515 } else {
516 return t;
517 }
518 }
520 /** Check that type is a class or interface type.
521 * @param pos Position to be used for error reporting.
522 * @param t The type to be checked.
523 */
524 Type checkClassType(DiagnosticPosition pos, Type t) {
525 if (t.tag != CLASS && t.tag != ERROR)
526 return typeTagError(pos,
527 diags.fragment("type.req.class"),
528 (t.tag == TYPEVAR)
529 ? diags.fragment("type.parameter", t)
530 : t);
531 else
532 return t;
533 }
535 /** Check that type is a class or interface type.
536 * @param pos Position to be used for error reporting.
537 * @param t The type to be checked.
538 * @param noBounds True if type bounds are illegal here.
539 */
540 Type checkClassType(DiagnosticPosition pos, Type t, boolean noBounds) {
541 t = checkClassType(pos, t);
542 if (noBounds && t.isParameterized()) {
543 List<Type> args = t.getTypeArguments();
544 while (args.nonEmpty()) {
545 if (args.head.tag == WILDCARD)
546 return typeTagError(pos,
547 Log.getLocalizedString("type.req.exact"),
548 args.head);
549 args = args.tail;
550 }
551 }
552 return t;
553 }
555 /** Check that type is a valid type for a new expression. If the type contains
556 * some uninferred type variables, instantiate them exploiting the expected
557 * type.
558 *
559 * @param pos Position to be used for error reporting.
560 * @param t The type to be checked.
561 * @param noBounds True if type bounds are illegal here.
562 * @param pt Expected type (used with diamond operator)
563 */
564 Type checkNewClassType(DiagnosticPosition pos, Type t, boolean noBounds, Type pt) {
565 if (t.tag == FORALL) {
566 try {
567 t = instantiatePoly(pos, (ForAll)t, pt, Warner.noWarnings);
568 }
569 catch (Infer.NoInstanceException ex) {
570 JCDiagnostic d = ex.getDiagnostic();
571 log.error(pos, "cant.apply.diamond", t.getTypeArguments(), d);
572 return types.createErrorType(pt);
573 }
574 }
575 return checkClassType(pos, t, noBounds);
576 }
578 /** Check that type is a reifiable class, interface or array type.
579 * @param pos Position to be used for error reporting.
580 * @param t The type to be checked.
581 */
582 Type checkReifiableReferenceType(DiagnosticPosition pos, Type t) {
583 if (t.tag != CLASS && t.tag != ARRAY && t.tag != ERROR) {
584 return typeTagError(pos,
585 diags.fragment("type.req.class.array"),
586 t);
587 } else if (!types.isReifiable(t)) {
588 log.error(pos, "illegal.generic.type.for.instof");
589 return types.createErrorType(t);
590 } else {
591 return t;
592 }
593 }
595 /** Check that type is a reference type, i.e. a class, interface or array type
596 * or a type variable.
597 * @param pos Position to be used for error reporting.
598 * @param t The type to be checked.
599 */
600 Type checkRefType(DiagnosticPosition pos, Type t) {
601 switch (t.tag) {
602 case CLASS:
603 case ARRAY:
604 case TYPEVAR:
605 case WILDCARD:
606 case ERROR:
607 return t;
608 default:
609 return typeTagError(pos,
610 diags.fragment("type.req.ref"),
611 t);
612 }
613 }
615 /** Check that each type is a reference type, i.e. a class, interface or array type
616 * or a type variable.
617 * @param trees Original trees, used for error reporting.
618 * @param types The types to be checked.
619 */
620 List<Type> checkRefTypes(List<JCExpression> trees, List<Type> types) {
621 List<JCExpression> tl = trees;
622 for (List<Type> l = types; l.nonEmpty(); l = l.tail) {
623 l.head = checkRefType(tl.head.pos(), l.head);
624 tl = tl.tail;
625 }
626 return types;
627 }
629 /** Check that type is a null or reference type.
630 * @param pos Position to be used for error reporting.
631 * @param t The type to be checked.
632 */
633 Type checkNullOrRefType(DiagnosticPosition pos, Type t) {
634 switch (t.tag) {
635 case CLASS:
636 case ARRAY:
637 case TYPEVAR:
638 case WILDCARD:
639 case BOT:
640 case ERROR:
641 return t;
642 default:
643 return typeTagError(pos,
644 diags.fragment("type.req.ref"),
645 t);
646 }
647 }
649 /** Check that flag set does not contain elements of two conflicting sets. s
650 * Return true if it doesn't.
651 * @param pos Position to be used for error reporting.
652 * @param flags The set of flags to be checked.
653 * @param set1 Conflicting flags set #1.
654 * @param set2 Conflicting flags set #2.
655 */
656 boolean checkDisjoint(DiagnosticPosition pos, long flags, long set1, long set2) {
657 if ((flags & set1) != 0 && (flags & set2) != 0) {
658 log.error(pos,
659 "illegal.combination.of.modifiers",
660 asFlagSet(TreeInfo.firstFlag(flags & set1)),
661 asFlagSet(TreeInfo.firstFlag(flags & set2)));
662 return false;
663 } else
664 return true;
665 }
667 /** Check that given modifiers are legal for given symbol and
668 * return modifiers together with any implicit modififiers for that symbol.
669 * Warning: we can't use flags() here since this method
670 * is called during class enter, when flags() would cause a premature
671 * completion.
672 * @param pos Position to be used for error reporting.
673 * @param flags The set of modifiers given in a definition.
674 * @param sym The defined symbol.
675 */
676 long checkFlags(DiagnosticPosition pos, long flags, Symbol sym, JCTree tree) {
677 long mask;
678 long implicit = 0;
679 switch (sym.kind) {
680 case VAR:
681 if (sym.owner.kind != TYP)
682 mask = LocalVarFlags;
683 else if ((sym.owner.flags_field & INTERFACE) != 0)
684 mask = implicit = InterfaceVarFlags;
685 else
686 mask = VarFlags;
687 break;
688 case MTH:
689 if (sym.name == names.init) {
690 if ((sym.owner.flags_field & ENUM) != 0) {
691 // enum constructors cannot be declared public or
692 // protected and must be implicitly or explicitly
693 // private
694 implicit = PRIVATE;
695 mask = PRIVATE;
696 } else
697 mask = ConstructorFlags;
698 } else if ((sym.owner.flags_field & INTERFACE) != 0)
699 mask = implicit = InterfaceMethodFlags;
700 else {
701 mask = MethodFlags;
702 }
703 // Imply STRICTFP if owner has STRICTFP set.
704 if (((flags|implicit) & Flags.ABSTRACT) == 0)
705 implicit |= sym.owner.flags_field & STRICTFP;
706 break;
707 case TYP:
708 if (sym.isLocal()) {
709 mask = LocalClassFlags;
710 if (sym.name.isEmpty()) { // Anonymous class
711 // Anonymous classes in static methods are themselves static;
712 // that's why we admit STATIC here.
713 mask |= STATIC;
714 // JLS: Anonymous classes are final.
715 implicit |= FINAL;
716 }
717 if ((sym.owner.flags_field & STATIC) == 0 &&
718 (flags & ENUM) != 0)
719 log.error(pos, "enums.must.be.static");
720 } else if (sym.owner.kind == TYP) {
721 mask = MemberClassFlags;
722 if (sym.owner.owner.kind == PCK ||
723 (sym.owner.flags_field & STATIC) != 0)
724 mask |= STATIC;
725 else if ((flags & ENUM) != 0)
726 log.error(pos, "enums.must.be.static");
727 // Nested interfaces and enums are always STATIC (Spec ???)
728 if ((flags & (INTERFACE | ENUM)) != 0 ) implicit = STATIC;
729 } else {
730 mask = ClassFlags;
731 }
732 // Interfaces are always ABSTRACT
733 if ((flags & INTERFACE) != 0) implicit |= ABSTRACT;
735 if ((flags & ENUM) != 0) {
736 // enums can't be declared abstract or final
737 mask &= ~(ABSTRACT | FINAL);
738 implicit |= implicitEnumFinalFlag(tree);
739 }
740 // Imply STRICTFP if owner has STRICTFP set.
741 implicit |= sym.owner.flags_field & STRICTFP;
742 break;
743 default:
744 throw new AssertionError();
745 }
746 long illegal = flags & StandardFlags & ~mask;
747 if (illegal != 0) {
748 if ((illegal & INTERFACE) != 0) {
749 log.error(pos, "intf.not.allowed.here");
750 mask |= INTERFACE;
751 }
752 else {
753 log.error(pos,
754 "mod.not.allowed.here", asFlagSet(illegal));
755 }
756 }
757 else if ((sym.kind == TYP ||
758 // ISSUE: Disallowing abstract&private is no longer appropriate
759 // in the presence of inner classes. Should it be deleted here?
760 checkDisjoint(pos, flags,
761 ABSTRACT,
762 PRIVATE | STATIC))
763 &&
764 checkDisjoint(pos, flags,
765 ABSTRACT | INTERFACE,
766 FINAL | NATIVE | SYNCHRONIZED)
767 &&
768 checkDisjoint(pos, flags,
769 PUBLIC,
770 PRIVATE | PROTECTED)
771 &&
772 checkDisjoint(pos, flags,
773 PRIVATE,
774 PUBLIC | PROTECTED)
775 &&
776 checkDisjoint(pos, flags,
777 FINAL,
778 VOLATILE)
779 &&
780 (sym.kind == TYP ||
781 checkDisjoint(pos, flags,
782 ABSTRACT | NATIVE,
783 STRICTFP))) {
784 // skip
785 }
786 return flags & (mask | ~StandardFlags) | implicit;
787 }
790 /** Determine if this enum should be implicitly final.
791 *
792 * If the enum has no specialized enum contants, it is final.
793 *
794 * If the enum does have specialized enum contants, it is
795 * <i>not</i> final.
796 */
797 private long implicitEnumFinalFlag(JCTree tree) {
798 if (tree.getTag() != JCTree.CLASSDEF) return 0;
799 class SpecialTreeVisitor extends JCTree.Visitor {
800 boolean specialized;
801 SpecialTreeVisitor() {
802 this.specialized = false;
803 };
805 @Override
806 public void visitTree(JCTree tree) { /* no-op */ }
808 @Override
809 public void visitVarDef(JCVariableDecl tree) {
810 if ((tree.mods.flags & ENUM) != 0) {
811 if (tree.init instanceof JCNewClass &&
812 ((JCNewClass) tree.init).def != null) {
813 specialized = true;
814 }
815 }
816 }
817 }
819 SpecialTreeVisitor sts = new SpecialTreeVisitor();
820 JCClassDecl cdef = (JCClassDecl) tree;
821 for (JCTree defs: cdef.defs) {
822 defs.accept(sts);
823 if (sts.specialized) return 0;
824 }
825 return FINAL;
826 }
828 /* *************************************************************************
829 * Type Validation
830 **************************************************************************/
832 /** Validate a type expression. That is,
833 * check that all type arguments of a parametric type are within
834 * their bounds. This must be done in a second phase after type attributon
835 * since a class might have a subclass as type parameter bound. E.g:
836 *
837 * class B<A extends C> { ... }
838 * class C extends B<C> { ... }
839 *
840 * and we can't make sure that the bound is already attributed because
841 * of possible cycles.
842 */
843 private Validator validator = new Validator();
845 /** Visitor method: Validate a type expression, if it is not null, catching
846 * and reporting any completion failures.
847 */
848 void validate(JCTree tree, Env<AttrContext> env) {
849 try {
850 if (tree != null) {
851 validator.env = env;
852 tree.accept(validator);
853 checkRaw(tree, env);
854 }
855 } catch (CompletionFailure ex) {
856 completionError(tree.pos(), ex);
857 }
858 }
859 //where
860 void checkRaw(JCTree tree, Env<AttrContext> env) {
861 if (lint.isEnabled(Lint.LintCategory.RAW) &&
862 tree.type.tag == CLASS &&
863 !env.enclClass.name.isEmpty() && //anonymous or intersection
864 tree.type.isRaw()) {
865 log.warning(tree.pos(), "raw.class.use", tree.type, tree.type.tsym.type);
866 }
867 }
869 /** Visitor method: Validate a list of type expressions.
870 */
871 void validate(List<? extends JCTree> trees, Env<AttrContext> env) {
872 for (List<? extends JCTree> l = trees; l.nonEmpty(); l = l.tail)
873 validate(l.head, env);
874 }
876 /** A visitor class for type validation.
877 */
878 class Validator extends JCTree.Visitor {
880 @Override
881 public void visitTypeArray(JCArrayTypeTree tree) {
882 validate(tree.elemtype, env);
883 }
885 @Override
886 public void visitTypeApply(JCTypeApply tree) {
887 if (tree.type.tag == CLASS) {
888 List<Type> formals = tree.type.tsym.type.allparams();
889 List<Type> actuals = tree.type.allparams();
890 List<JCExpression> args = tree.arguments;
891 List<Type> forms = tree.type.tsym.type.getTypeArguments();
892 ListBuffer<TypeVar> tvars_buf = new ListBuffer<TypeVar>();
894 // For matching pairs of actual argument types `a' and
895 // formal type parameters with declared bound `b' ...
896 while (args.nonEmpty() && forms.nonEmpty()) {
897 validate(args.head, env);
899 // exact type arguments needs to know their
900 // bounds (for upper and lower bound
901 // calculations). So we create new TypeVars with
902 // bounds substed with actuals.
903 tvars_buf.append(types.substBound(((TypeVar)forms.head),
904 formals,
905 actuals));
907 args = args.tail;
908 forms = forms.tail;
909 }
911 args = tree.arguments;
912 List<Type> tvars_cap = types.substBounds(formals,
913 formals,
914 types.capture(tree.type).allparams());
915 while (args.nonEmpty() && tvars_cap.nonEmpty()) {
916 // Let the actual arguments know their bound
917 args.head.type.withTypeVar((TypeVar)tvars_cap.head);
918 args = args.tail;
919 tvars_cap = tvars_cap.tail;
920 }
922 args = tree.arguments;
923 List<TypeVar> tvars = tvars_buf.toList();
925 while (args.nonEmpty() && tvars.nonEmpty()) {
926 checkExtends(args.head.pos(),
927 args.head.type,
928 tvars.head);
929 args = args.tail;
930 tvars = tvars.tail;
931 }
933 checkCapture(tree);
934 }
935 if (tree.type.tag == CLASS || tree.type.tag == FORALL) {
936 // Check that this type is either fully parameterized, or
937 // not parameterized at all.
938 if (tree.type.getEnclosingType().isRaw())
939 log.error(tree.pos(), "improperly.formed.type.inner.raw.param");
940 if (tree.clazz.getTag() == JCTree.SELECT)
941 visitSelectInternal((JCFieldAccess)tree.clazz);
942 }
943 }
945 @Override
946 public void visitTypeParameter(JCTypeParameter tree) {
947 validate(tree.bounds, env);
948 checkClassBounds(tree.pos(), tree.type);
949 }
951 @Override
952 public void visitWildcard(JCWildcard tree) {
953 if (tree.inner != null)
954 validate(tree.inner, env);
955 }
957 @Override
958 public void visitSelect(JCFieldAccess tree) {
959 if (tree.type.tag == CLASS) {
960 visitSelectInternal(tree);
962 // Check that this type is either fully parameterized, or
963 // not parameterized at all.
964 if (tree.selected.type.isParameterized() && tree.type.tsym.type.getTypeArguments().nonEmpty())
965 log.error(tree.pos(), "improperly.formed.type.param.missing");
966 }
967 }
968 public void visitSelectInternal(JCFieldAccess tree) {
969 if (tree.type.tsym.isStatic() &&
970 tree.selected.type.isParameterized()) {
971 // The enclosing type is not a class, so we are
972 // looking at a static member type. However, the
973 // qualifying expression is parameterized.
974 log.error(tree.pos(), "cant.select.static.class.from.param.type");
975 } else {
976 // otherwise validate the rest of the expression
977 tree.selected.accept(this);
978 }
979 }
981 @Override
982 public void visitAnnotatedType(JCAnnotatedType tree) {
983 tree.underlyingType.accept(this);
984 }
986 /** Default visitor method: do nothing.
987 */
988 @Override
989 public void visitTree(JCTree tree) {
990 }
992 Env<AttrContext> env;
993 }
995 /* *************************************************************************
996 * Exception checking
997 **************************************************************************/
999 /* The following methods treat classes as sets that contain
1000 * the class itself and all their subclasses
1001 */
1003 /** Is given type a subtype of some of the types in given list?
1004 */
1005 boolean subset(Type t, List<Type> ts) {
1006 for (List<Type> l = ts; l.nonEmpty(); l = l.tail)
1007 if (types.isSubtype(t, l.head)) return true;
1008 return false;
1009 }
1011 /** Is given type a subtype or supertype of
1012 * some of the types in given list?
1013 */
1014 boolean intersects(Type t, List<Type> ts) {
1015 for (List<Type> l = ts; l.nonEmpty(); l = l.tail)
1016 if (types.isSubtype(t, l.head) || types.isSubtype(l.head, t)) return true;
1017 return false;
1018 }
1020 /** Add type set to given type list, unless it is a subclass of some class
1021 * in the list.
1022 */
1023 List<Type> incl(Type t, List<Type> ts) {
1024 return subset(t, ts) ? ts : excl(t, ts).prepend(t);
1025 }
1027 /** Remove type set from type set list.
1028 */
1029 List<Type> excl(Type t, List<Type> ts) {
1030 if (ts.isEmpty()) {
1031 return ts;
1032 } else {
1033 List<Type> ts1 = excl(t, ts.tail);
1034 if (types.isSubtype(ts.head, t)) return ts1;
1035 else if (ts1 == ts.tail) return ts;
1036 else return ts1.prepend(ts.head);
1037 }
1038 }
1040 /** Form the union of two type set lists.
1041 */
1042 List<Type> union(List<Type> ts1, List<Type> ts2) {
1043 List<Type> ts = ts1;
1044 for (List<Type> l = ts2; l.nonEmpty(); l = l.tail)
1045 ts = incl(l.head, ts);
1046 return ts;
1047 }
1049 /** Form the difference of two type lists.
1050 */
1051 List<Type> diff(List<Type> ts1, List<Type> ts2) {
1052 List<Type> ts = ts1;
1053 for (List<Type> l = ts2; l.nonEmpty(); l = l.tail)
1054 ts = excl(l.head, ts);
1055 return ts;
1056 }
1058 /** Form the intersection of two type lists.
1059 */
1060 public List<Type> intersect(List<Type> ts1, List<Type> ts2) {
1061 List<Type> ts = List.nil();
1062 for (List<Type> l = ts1; l.nonEmpty(); l = l.tail)
1063 if (subset(l.head, ts2)) ts = incl(l.head, ts);
1064 for (List<Type> l = ts2; l.nonEmpty(); l = l.tail)
1065 if (subset(l.head, ts1)) ts = incl(l.head, ts);
1066 return ts;
1067 }
1069 /** Is exc an exception symbol that need not be declared?
1070 */
1071 boolean isUnchecked(ClassSymbol exc) {
1072 return
1073 exc.kind == ERR ||
1074 exc.isSubClass(syms.errorType.tsym, types) ||
1075 exc.isSubClass(syms.runtimeExceptionType.tsym, types);
1076 }
1078 /** Is exc an exception type that need not be declared?
1079 */
1080 boolean isUnchecked(Type exc) {
1081 return
1082 (exc.tag == TYPEVAR) ? isUnchecked(types.supertype(exc)) :
1083 (exc.tag == CLASS) ? isUnchecked((ClassSymbol)exc.tsym) :
1084 exc.tag == BOT;
1085 }
1087 /** Same, but handling completion failures.
1088 */
1089 boolean isUnchecked(DiagnosticPosition pos, Type exc) {
1090 try {
1091 return isUnchecked(exc);
1092 } catch (CompletionFailure ex) {
1093 completionError(pos, ex);
1094 return true;
1095 }
1096 }
1098 /** Is exc handled by given exception list?
1099 */
1100 boolean isHandled(Type exc, List<Type> handled) {
1101 return isUnchecked(exc) || subset(exc, handled);
1102 }
1104 /** Return all exceptions in thrown list that are not in handled list.
1105 * @param thrown The list of thrown exceptions.
1106 * @param handled The list of handled exceptions.
1107 */
1108 List<Type> unhandled(List<Type> thrown, List<Type> handled) {
1109 List<Type> unhandled = List.nil();
1110 for (List<Type> l = thrown; l.nonEmpty(); l = l.tail)
1111 if (!isHandled(l.head, handled)) unhandled = unhandled.prepend(l.head);
1112 return unhandled;
1113 }
1115 /* *************************************************************************
1116 * Overriding/Implementation checking
1117 **************************************************************************/
1119 /** The level of access protection given by a flag set,
1120 * where PRIVATE is highest and PUBLIC is lowest.
1121 */
1122 static int protection(long flags) {
1123 switch ((short)(flags & AccessFlags)) {
1124 case PRIVATE: return 3;
1125 case PROTECTED: return 1;
1126 default:
1127 case PUBLIC: return 0;
1128 case 0: return 2;
1129 }
1130 }
1132 /** A customized "cannot override" error message.
1133 * @param m The overriding method.
1134 * @param other The overridden method.
1135 * @return An internationalized string.
1136 */
1137 Object cannotOverride(MethodSymbol m, MethodSymbol other) {
1138 String key;
1139 if ((other.owner.flags() & INTERFACE) == 0)
1140 key = "cant.override";
1141 else if ((m.owner.flags() & INTERFACE) == 0)
1142 key = "cant.implement";
1143 else
1144 key = "clashes.with";
1145 return diags.fragment(key, m, m.location(), other, other.location());
1146 }
1148 /** A customized "override" warning message.
1149 * @param m The overriding method.
1150 * @param other The overridden method.
1151 * @return An internationalized string.
1152 */
1153 Object uncheckedOverrides(MethodSymbol m, MethodSymbol other) {
1154 String key;
1155 if ((other.owner.flags() & INTERFACE) == 0)
1156 key = "unchecked.override";
1157 else if ((m.owner.flags() & INTERFACE) == 0)
1158 key = "unchecked.implement";
1159 else
1160 key = "unchecked.clash.with";
1161 return diags.fragment(key, m, m.location(), other, other.location());
1162 }
1164 /** A customized "override" warning message.
1165 * @param m The overriding method.
1166 * @param other The overridden method.
1167 * @return An internationalized string.
1168 */
1169 Object varargsOverrides(MethodSymbol m, MethodSymbol other) {
1170 String key;
1171 if ((other.owner.flags() & INTERFACE) == 0)
1172 key = "varargs.override";
1173 else if ((m.owner.flags() & INTERFACE) == 0)
1174 key = "varargs.implement";
1175 else
1176 key = "varargs.clash.with";
1177 return diags.fragment(key, m, m.location(), other, other.location());
1178 }
1180 /** Check that this method conforms with overridden method 'other'.
1181 * where `origin' is the class where checking started.
1182 * Complications:
1183 * (1) Do not check overriding of synthetic methods
1184 * (reason: they might be final).
1185 * todo: check whether this is still necessary.
1186 * (2) Admit the case where an interface proxy throws fewer exceptions
1187 * than the method it implements. Augment the proxy methods with the
1188 * undeclared exceptions in this case.
1189 * (3) When generics are enabled, admit the case where an interface proxy
1190 * has a result type
1191 * extended by the result type of the method it implements.
1192 * Change the proxies result type to the smaller type in this case.
1193 *
1194 * @param tree The tree from which positions
1195 * are extracted for errors.
1196 * @param m The overriding method.
1197 * @param other The overridden method.
1198 * @param origin The class of which the overriding method
1199 * is a member.
1200 */
1201 void checkOverride(JCTree tree,
1202 MethodSymbol m,
1203 MethodSymbol other,
1204 ClassSymbol origin) {
1205 // Don't check overriding of synthetic methods or by bridge methods.
1206 if ((m.flags() & (SYNTHETIC|BRIDGE)) != 0 || (other.flags() & SYNTHETIC) != 0) {
1207 return;
1208 }
1210 // Error if static method overrides instance method (JLS 8.4.6.2).
1211 if ((m.flags() & STATIC) != 0 &&
1212 (other.flags() & STATIC) == 0) {
1213 log.error(TreeInfo.diagnosticPositionFor(m, tree), "override.static",
1214 cannotOverride(m, other));
1215 return;
1216 }
1218 // Error if instance method overrides static or final
1219 // method (JLS 8.4.6.1).
1220 if ((other.flags() & FINAL) != 0 ||
1221 (m.flags() & STATIC) == 0 &&
1222 (other.flags() & STATIC) != 0) {
1223 log.error(TreeInfo.diagnosticPositionFor(m, tree), "override.meth",
1224 cannotOverride(m, other),
1225 asFlagSet(other.flags() & (FINAL | STATIC)));
1226 return;
1227 }
1229 if ((m.owner.flags() & ANNOTATION) != 0) {
1230 // handled in validateAnnotationMethod
1231 return;
1232 }
1234 // Error if overriding method has weaker access (JLS 8.4.6.3).
1235 if ((origin.flags() & INTERFACE) == 0 &&
1236 protection(m.flags()) > protection(other.flags())) {
1237 log.error(TreeInfo.diagnosticPositionFor(m, tree), "override.weaker.access",
1238 cannotOverride(m, other),
1239 other.flags() == 0 ?
1240 Flag.PACKAGE :
1241 asFlagSet(other.flags() & AccessFlags));
1242 return;
1243 }
1245 Type mt = types.memberType(origin.type, m);
1246 Type ot = types.memberType(origin.type, other);
1247 // Error if overriding result type is different
1248 // (or, in the case of generics mode, not a subtype) of
1249 // overridden result type. We have to rename any type parameters
1250 // before comparing types.
1251 List<Type> mtvars = mt.getTypeArguments();
1252 List<Type> otvars = ot.getTypeArguments();
1253 Type mtres = mt.getReturnType();
1254 Type otres = types.subst(ot.getReturnType(), otvars, mtvars);
1256 overrideWarner.warned = false;
1257 boolean resultTypesOK =
1258 types.returnTypeSubstitutable(mt, ot, otres, overrideWarner);
1259 if (!resultTypesOK) {
1260 if (!allowCovariantReturns &&
1261 m.owner != origin &&
1262 m.owner.isSubClass(other.owner, types)) {
1263 // allow limited interoperability with covariant returns
1264 } else {
1265 log.error(TreeInfo.diagnosticPositionFor(m, tree),
1266 "override.incompatible.ret",
1267 cannotOverride(m, other),
1268 mtres, otres);
1269 return;
1270 }
1271 } else if (overrideWarner.warned) {
1272 warnUnchecked(TreeInfo.diagnosticPositionFor(m, tree),
1273 "override.unchecked.ret",
1274 uncheckedOverrides(m, other),
1275 mtres, otres);
1276 }
1278 // Error if overriding method throws an exception not reported
1279 // by overridden method.
1280 List<Type> otthrown = types.subst(ot.getThrownTypes(), otvars, mtvars);
1281 List<Type> unhandledErased = unhandled(mt.getThrownTypes(), types.erasure(otthrown));
1282 List<Type> unhandledUnerased = unhandled(mt.getThrownTypes(), otthrown);
1283 if (unhandledErased.nonEmpty()) {
1284 log.error(TreeInfo.diagnosticPositionFor(m, tree),
1285 "override.meth.doesnt.throw",
1286 cannotOverride(m, other),
1287 unhandledUnerased.head);
1288 return;
1289 }
1290 else if (unhandledUnerased.nonEmpty()) {
1291 warnUnchecked(TreeInfo.diagnosticPositionFor(m, tree),
1292 "override.unchecked.thrown",
1293 cannotOverride(m, other),
1294 unhandledUnerased.head);
1295 return;
1296 }
1298 // Optional warning if varargs don't agree
1299 if ((((m.flags() ^ other.flags()) & Flags.VARARGS) != 0)
1300 && lint.isEnabled(Lint.LintCategory.OVERRIDES)) {
1301 log.warning(TreeInfo.diagnosticPositionFor(m, tree),
1302 ((m.flags() & Flags.VARARGS) != 0)
1303 ? "override.varargs.missing"
1304 : "override.varargs.extra",
1305 varargsOverrides(m, other));
1306 }
1308 // Warn if instance method overrides bridge method (compiler spec ??)
1309 if ((other.flags() & BRIDGE) != 0) {
1310 log.warning(TreeInfo.diagnosticPositionFor(m, tree), "override.bridge",
1311 uncheckedOverrides(m, other));
1312 }
1314 // Warn if a deprecated method overridden by a non-deprecated one.
1315 if ((other.flags() & DEPRECATED) != 0
1316 && (m.flags() & DEPRECATED) == 0
1317 && m.outermostClass() != other.outermostClass()
1318 && !isDeprecatedOverrideIgnorable(other, origin)) {
1319 warnDeprecated(TreeInfo.diagnosticPositionFor(m, tree), other);
1320 }
1321 }
1322 // where
1323 private boolean isDeprecatedOverrideIgnorable(MethodSymbol m, ClassSymbol origin) {
1324 // If the method, m, is defined in an interface, then ignore the issue if the method
1325 // is only inherited via a supertype and also implemented in the supertype,
1326 // because in that case, we will rediscover the issue when examining the method
1327 // in the supertype.
1328 // If the method, m, is not defined in an interface, then the only time we need to
1329 // address the issue is when the method is the supertype implemementation: any other
1330 // case, we will have dealt with when examining the supertype classes
1331 ClassSymbol mc = m.enclClass();
1332 Type st = types.supertype(origin.type);
1333 if (st.tag != CLASS)
1334 return true;
1335 MethodSymbol stimpl = m.implementation((ClassSymbol)st.tsym, types, false);
1337 if (mc != null && ((mc.flags() & INTERFACE) != 0)) {
1338 List<Type> intfs = types.interfaces(origin.type);
1339 return (intfs.contains(mc.type) ? false : (stimpl != null));
1340 }
1341 else
1342 return (stimpl != m);
1343 }
1346 // used to check if there were any unchecked conversions
1347 Warner overrideWarner = new Warner();
1349 /** Check that a class does not inherit two concrete methods
1350 * with the same signature.
1351 * @param pos Position to be used for error reporting.
1352 * @param site The class type to be checked.
1353 */
1354 public void checkCompatibleConcretes(DiagnosticPosition pos, Type site) {
1355 Type sup = types.supertype(site);
1356 if (sup.tag != CLASS) return;
1358 for (Type t1 = sup;
1359 t1.tsym.type.isParameterized();
1360 t1 = types.supertype(t1)) {
1361 for (Scope.Entry e1 = t1.tsym.members().elems;
1362 e1 != null;
1363 e1 = e1.sibling) {
1364 Symbol s1 = e1.sym;
1365 if (s1.kind != MTH ||
1366 (s1.flags() & (STATIC|SYNTHETIC|BRIDGE)) != 0 ||
1367 !s1.isInheritedIn(site.tsym, types) ||
1368 ((MethodSymbol)s1).implementation(site.tsym,
1369 types,
1370 true) != s1)
1371 continue;
1372 Type st1 = types.memberType(t1, s1);
1373 int s1ArgsLength = st1.getParameterTypes().length();
1374 if (st1 == s1.type) continue;
1376 for (Type t2 = sup;
1377 t2.tag == CLASS;
1378 t2 = types.supertype(t2)) {
1379 for (Scope.Entry e2 = t2.tsym.members().lookup(s1.name);
1380 e2.scope != null;
1381 e2 = e2.next()) {
1382 Symbol s2 = e2.sym;
1383 if (s2 == s1 ||
1384 s2.kind != MTH ||
1385 (s2.flags() & (STATIC|SYNTHETIC|BRIDGE)) != 0 ||
1386 s2.type.getParameterTypes().length() != s1ArgsLength ||
1387 !s2.isInheritedIn(site.tsym, types) ||
1388 ((MethodSymbol)s2).implementation(site.tsym,
1389 types,
1390 true) != s2)
1391 continue;
1392 Type st2 = types.memberType(t2, s2);
1393 if (types.overrideEquivalent(st1, st2))
1394 log.error(pos, "concrete.inheritance.conflict",
1395 s1, t1, s2, t2, sup);
1396 }
1397 }
1398 }
1399 }
1400 }
1402 /** Check that classes (or interfaces) do not each define an abstract
1403 * method with same name and arguments but incompatible return types.
1404 * @param pos Position to be used for error reporting.
1405 * @param t1 The first argument type.
1406 * @param t2 The second argument type.
1407 */
1408 public boolean checkCompatibleAbstracts(DiagnosticPosition pos,
1409 Type t1,
1410 Type t2) {
1411 return checkCompatibleAbstracts(pos, t1, t2,
1412 types.makeCompoundType(t1, t2));
1413 }
1415 public boolean checkCompatibleAbstracts(DiagnosticPosition pos,
1416 Type t1,
1417 Type t2,
1418 Type site) {
1419 Symbol sym = firstIncompatibility(t1, t2, site);
1420 if (sym != null) {
1421 log.error(pos, "types.incompatible.diff.ret",
1422 t1, t2, sym.name +
1423 "(" + types.memberType(t2, sym).getParameterTypes() + ")");
1424 return false;
1425 }
1426 return true;
1427 }
1429 /** Return the first method which is defined with same args
1430 * but different return types in two given interfaces, or null if none
1431 * exists.
1432 * @param t1 The first type.
1433 * @param t2 The second type.
1434 * @param site The most derived type.
1435 * @returns symbol from t2 that conflicts with one in t1.
1436 */
1437 private Symbol firstIncompatibility(Type t1, Type t2, Type site) {
1438 Map<TypeSymbol,Type> interfaces1 = new HashMap<TypeSymbol,Type>();
1439 closure(t1, interfaces1);
1440 Map<TypeSymbol,Type> interfaces2;
1441 if (t1 == t2)
1442 interfaces2 = interfaces1;
1443 else
1444 closure(t2, interfaces1, interfaces2 = new HashMap<TypeSymbol,Type>());
1446 for (Type t3 : interfaces1.values()) {
1447 for (Type t4 : interfaces2.values()) {
1448 Symbol s = firstDirectIncompatibility(t3, t4, site);
1449 if (s != null) return s;
1450 }
1451 }
1452 return null;
1453 }
1455 /** Compute all the supertypes of t, indexed by type symbol. */
1456 private void closure(Type t, Map<TypeSymbol,Type> typeMap) {
1457 if (t.tag != CLASS) return;
1458 if (typeMap.put(t.tsym, t) == null) {
1459 closure(types.supertype(t), typeMap);
1460 for (Type i : types.interfaces(t))
1461 closure(i, typeMap);
1462 }
1463 }
1465 /** Compute all the supertypes of t, indexed by type symbol (except thise in typesSkip). */
1466 private void closure(Type t, Map<TypeSymbol,Type> typesSkip, Map<TypeSymbol,Type> typeMap) {
1467 if (t.tag != CLASS) return;
1468 if (typesSkip.get(t.tsym) != null) return;
1469 if (typeMap.put(t.tsym, t) == null) {
1470 closure(types.supertype(t), typesSkip, typeMap);
1471 for (Type i : types.interfaces(t))
1472 closure(i, typesSkip, typeMap);
1473 }
1474 }
1476 /** Return the first method in t2 that conflicts with a method from t1. */
1477 private Symbol firstDirectIncompatibility(Type t1, Type t2, Type site) {
1478 for (Scope.Entry e1 = t1.tsym.members().elems; e1 != null; e1 = e1.sibling) {
1479 Symbol s1 = e1.sym;
1480 Type st1 = null;
1481 if (s1.kind != MTH || !s1.isInheritedIn(site.tsym, types)) continue;
1482 Symbol impl = ((MethodSymbol)s1).implementation(site.tsym, types, false);
1483 if (impl != null && (impl.flags() & ABSTRACT) == 0) continue;
1484 for (Scope.Entry e2 = t2.tsym.members().lookup(s1.name); e2.scope != null; e2 = e2.next()) {
1485 Symbol s2 = e2.sym;
1486 if (s1 == s2) continue;
1487 if (s2.kind != MTH || !s2.isInheritedIn(site.tsym, types)) continue;
1488 if (st1 == null) st1 = types.memberType(t1, s1);
1489 Type st2 = types.memberType(t2, s2);
1490 if (types.overrideEquivalent(st1, st2)) {
1491 List<Type> tvars1 = st1.getTypeArguments();
1492 List<Type> tvars2 = st2.getTypeArguments();
1493 Type rt1 = st1.getReturnType();
1494 Type rt2 = types.subst(st2.getReturnType(), tvars2, tvars1);
1495 boolean compat =
1496 types.isSameType(rt1, rt2) ||
1497 rt1.tag >= CLASS && rt2.tag >= CLASS &&
1498 (types.covariantReturnType(rt1, rt2, Warner.noWarnings) ||
1499 types.covariantReturnType(rt2, rt1, Warner.noWarnings)) ||
1500 checkCommonOverriderIn(s1,s2,site);
1501 if (!compat) return s2;
1502 }
1503 }
1504 }
1505 return null;
1506 }
1507 //WHERE
1508 boolean checkCommonOverriderIn(Symbol s1, Symbol s2, Type site) {
1509 Map<TypeSymbol,Type> supertypes = new HashMap<TypeSymbol,Type>();
1510 Type st1 = types.memberType(site, s1);
1511 Type st2 = types.memberType(site, s2);
1512 closure(site, supertypes);
1513 for (Type t : supertypes.values()) {
1514 for (Scope.Entry e = t.tsym.members().lookup(s1.name); e.scope != null; e = e.next()) {
1515 Symbol s3 = e.sym;
1516 if (s3 == s1 || s3 == s2 || s3.kind != MTH || (s3.flags() & (BRIDGE|SYNTHETIC)) != 0) continue;
1517 Type st3 = types.memberType(site,s3);
1518 if (types.overrideEquivalent(st3, st1) && types.overrideEquivalent(st3, st2)) {
1519 if (s3.owner == site.tsym) {
1520 return true;
1521 }
1522 List<Type> tvars1 = st1.getTypeArguments();
1523 List<Type> tvars2 = st2.getTypeArguments();
1524 List<Type> tvars3 = st3.getTypeArguments();
1525 Type rt1 = st1.getReturnType();
1526 Type rt2 = st2.getReturnType();
1527 Type rt13 = types.subst(st3.getReturnType(), tvars3, tvars1);
1528 Type rt23 = types.subst(st3.getReturnType(), tvars3, tvars2);
1529 boolean compat =
1530 rt13.tag >= CLASS && rt23.tag >= CLASS &&
1531 (types.covariantReturnType(rt13, rt1, Warner.noWarnings) &&
1532 types.covariantReturnType(rt23, rt2, Warner.noWarnings));
1533 if (compat)
1534 return true;
1535 }
1536 }
1537 }
1538 return false;
1539 }
1541 /** Check that a given method conforms with any method it overrides.
1542 * @param tree The tree from which positions are extracted
1543 * for errors.
1544 * @param m The overriding method.
1545 */
1546 void checkOverride(JCTree tree, MethodSymbol m) {
1547 ClassSymbol origin = (ClassSymbol)m.owner;
1548 if ((origin.flags() & ENUM) != 0 && names.finalize.equals(m.name))
1549 if (m.overrides(syms.enumFinalFinalize, origin, types, false)) {
1550 log.error(tree.pos(), "enum.no.finalize");
1551 return;
1552 }
1553 for (Type t = types.supertype(origin.type); t.tag == CLASS;
1554 t = types.supertype(t)) {
1555 TypeSymbol c = t.tsym;
1556 Scope.Entry e = c.members().lookup(m.name);
1557 while (e.scope != null) {
1558 if (m.overrides(e.sym, origin, types, false))
1559 checkOverride(tree, m, (MethodSymbol)e.sym, origin);
1560 else if (e.sym.kind == MTH &&
1561 e.sym.isInheritedIn(origin, types) &&
1562 (e.sym.flags() & SYNTHETIC) == 0 &&
1563 !m.isConstructor()) {
1564 Type er1 = m.erasure(types);
1565 Type er2 = e.sym.erasure(types);
1566 if (types.isSameTypes(er1.getParameterTypes(),
1567 er2.getParameterTypes())) {
1568 log.error(TreeInfo.diagnosticPositionFor(m, tree),
1569 "name.clash.same.erasure.no.override",
1570 m, m.location(),
1571 e.sym, e.sym.location());
1572 }
1573 }
1574 e = e.next();
1575 }
1576 }
1577 }
1579 /** Check that all abstract members of given class have definitions.
1580 * @param pos Position to be used for error reporting.
1581 * @param c The class.
1582 */
1583 void checkAllDefined(DiagnosticPosition pos, ClassSymbol c) {
1584 try {
1585 MethodSymbol undef = firstUndef(c, c);
1586 if (undef != null) {
1587 if ((c.flags() & ENUM) != 0 &&
1588 types.supertype(c.type).tsym == syms.enumSym &&
1589 (c.flags() & FINAL) == 0) {
1590 // add the ABSTRACT flag to an enum
1591 c.flags_field |= ABSTRACT;
1592 } else {
1593 MethodSymbol undef1 =
1594 new MethodSymbol(undef.flags(), undef.name,
1595 types.memberType(c.type, undef), undef.owner);
1596 log.error(pos, "does.not.override.abstract",
1597 c, undef1, undef1.location());
1598 }
1599 }
1600 } catch (CompletionFailure ex) {
1601 completionError(pos, ex);
1602 }
1603 }
1604 //where
1605 /** Return first abstract member of class `c' that is not defined
1606 * in `impl', null if there is none.
1607 */
1608 private MethodSymbol firstUndef(ClassSymbol impl, ClassSymbol c) {
1609 MethodSymbol undef = null;
1610 // Do not bother to search in classes that are not abstract,
1611 // since they cannot have abstract members.
1612 if (c == impl || (c.flags() & (ABSTRACT | INTERFACE)) != 0) {
1613 Scope s = c.members();
1614 for (Scope.Entry e = s.elems;
1615 undef == null && e != null;
1616 e = e.sibling) {
1617 if (e.sym.kind == MTH &&
1618 (e.sym.flags() & (ABSTRACT|IPROXY)) == ABSTRACT) {
1619 MethodSymbol absmeth = (MethodSymbol)e.sym;
1620 MethodSymbol implmeth = absmeth.implementation(impl, types, true);
1621 if (implmeth == null || implmeth == absmeth)
1622 undef = absmeth;
1623 }
1624 }
1625 if (undef == null) {
1626 Type st = types.supertype(c.type);
1627 if (st.tag == CLASS)
1628 undef = firstUndef(impl, (ClassSymbol)st.tsym);
1629 }
1630 for (List<Type> l = types.interfaces(c.type);
1631 undef == null && l.nonEmpty();
1632 l = l.tail) {
1633 undef = firstUndef(impl, (ClassSymbol)l.head.tsym);
1634 }
1635 }
1636 return undef;
1637 }
1639 /** Check for cyclic references. Issue an error if the
1640 * symbol of the type referred to has a LOCKED flag set.
1641 *
1642 * @param pos Position to be used for error reporting.
1643 * @param t The type referred to.
1644 */
1645 void checkNonCyclic(DiagnosticPosition pos, Type t) {
1646 checkNonCyclicInternal(pos, t);
1647 }
1650 void checkNonCyclic(DiagnosticPosition pos, TypeVar t) {
1651 checkNonCyclic1(pos, t, List.<TypeVar>nil());
1652 }
1654 private void checkNonCyclic1(DiagnosticPosition pos, Type t, List<TypeVar> seen) {
1655 final TypeVar tv;
1656 if (t.tag == TYPEVAR && (t.tsym.flags() & UNATTRIBUTED) != 0)
1657 return;
1658 if (seen.contains(t)) {
1659 tv = (TypeVar)t;
1660 tv.bound = types.createErrorType(t);
1661 log.error(pos, "cyclic.inheritance", t);
1662 } else if (t.tag == TYPEVAR) {
1663 tv = (TypeVar)t;
1664 seen = seen.prepend(tv);
1665 for (Type b : types.getBounds(tv))
1666 checkNonCyclic1(pos, b, seen);
1667 }
1668 }
1670 /** Check for cyclic references. Issue an error if the
1671 * symbol of the type referred to has a LOCKED flag set.
1672 *
1673 * @param pos Position to be used for error reporting.
1674 * @param t The type referred to.
1675 * @returns True if the check completed on all attributed classes
1676 */
1677 private boolean checkNonCyclicInternal(DiagnosticPosition pos, Type t) {
1678 boolean complete = true; // was the check complete?
1679 //- System.err.println("checkNonCyclicInternal("+t+");");//DEBUG
1680 Symbol c = t.tsym;
1681 if ((c.flags_field & ACYCLIC) != 0) return true;
1683 if ((c.flags_field & LOCKED) != 0) {
1684 noteCyclic(pos, (ClassSymbol)c);
1685 } else if (!c.type.isErroneous()) {
1686 try {
1687 c.flags_field |= LOCKED;
1688 if (c.type.tag == CLASS) {
1689 ClassType clazz = (ClassType)c.type;
1690 if (clazz.interfaces_field != null)
1691 for (List<Type> l=clazz.interfaces_field; l.nonEmpty(); l=l.tail)
1692 complete &= checkNonCyclicInternal(pos, l.head);
1693 if (clazz.supertype_field != null) {
1694 Type st = clazz.supertype_field;
1695 if (st != null && st.tag == CLASS)
1696 complete &= checkNonCyclicInternal(pos, st);
1697 }
1698 if (c.owner.kind == TYP)
1699 complete &= checkNonCyclicInternal(pos, c.owner.type);
1700 }
1701 } finally {
1702 c.flags_field &= ~LOCKED;
1703 }
1704 }
1705 if (complete)
1706 complete = ((c.flags_field & UNATTRIBUTED) == 0) && c.completer == null;
1707 if (complete) c.flags_field |= ACYCLIC;
1708 return complete;
1709 }
1711 /** Note that we found an inheritance cycle. */
1712 private void noteCyclic(DiagnosticPosition pos, ClassSymbol c) {
1713 log.error(pos, "cyclic.inheritance", c);
1714 for (List<Type> l=types.interfaces(c.type); l.nonEmpty(); l=l.tail)
1715 l.head = types.createErrorType((ClassSymbol)l.head.tsym, Type.noType);
1716 Type st = types.supertype(c.type);
1717 if (st.tag == CLASS)
1718 ((ClassType)c.type).supertype_field = types.createErrorType((ClassSymbol)st.tsym, Type.noType);
1719 c.type = types.createErrorType(c, c.type);
1720 c.flags_field |= ACYCLIC;
1721 }
1723 /** Check that all methods which implement some
1724 * method conform to the method they implement.
1725 * @param tree The class definition whose members are checked.
1726 */
1727 void checkImplementations(JCClassDecl tree) {
1728 checkImplementations(tree, tree.sym);
1729 }
1730 //where
1731 /** Check that all methods which implement some
1732 * method in `ic' conform to the method they implement.
1733 */
1734 void checkImplementations(JCClassDecl tree, ClassSymbol ic) {
1735 ClassSymbol origin = tree.sym;
1736 for (List<Type> l = types.closure(ic.type); l.nonEmpty(); l = l.tail) {
1737 ClassSymbol lc = (ClassSymbol)l.head.tsym;
1738 if ((allowGenerics || origin != lc) && (lc.flags() & ABSTRACT) != 0) {
1739 for (Scope.Entry e=lc.members().elems; e != null; e=e.sibling) {
1740 if (e.sym.kind == MTH &&
1741 (e.sym.flags() & (STATIC|ABSTRACT)) == ABSTRACT) {
1742 MethodSymbol absmeth = (MethodSymbol)e.sym;
1743 MethodSymbol implmeth = absmeth.implementation(origin, types, false);
1744 if (implmeth != null && implmeth != absmeth &&
1745 (implmeth.owner.flags() & INTERFACE) ==
1746 (origin.flags() & INTERFACE)) {
1747 // don't check if implmeth is in a class, yet
1748 // origin is an interface. This case arises only
1749 // if implmeth is declared in Object. The reason is
1750 // that interfaces really don't inherit from
1751 // Object it's just that the compiler represents
1752 // things that way.
1753 checkOverride(tree, implmeth, absmeth, origin);
1754 }
1755 }
1756 }
1757 }
1758 }
1759 }
1761 /** Check that all abstract methods implemented by a class are
1762 * mutually compatible.
1763 * @param pos Position to be used for error reporting.
1764 * @param c The class whose interfaces are checked.
1765 */
1766 void checkCompatibleSupertypes(DiagnosticPosition pos, Type c) {
1767 List<Type> supertypes = types.interfaces(c);
1768 Type supertype = types.supertype(c);
1769 if (supertype.tag == CLASS &&
1770 (supertype.tsym.flags() & ABSTRACT) != 0)
1771 supertypes = supertypes.prepend(supertype);
1772 for (List<Type> l = supertypes; l.nonEmpty(); l = l.tail) {
1773 if (allowGenerics && !l.head.getTypeArguments().isEmpty() &&
1774 !checkCompatibleAbstracts(pos, l.head, l.head, c))
1775 return;
1776 for (List<Type> m = supertypes; m != l; m = m.tail)
1777 if (!checkCompatibleAbstracts(pos, l.head, m.head, c))
1778 return;
1779 }
1780 checkCompatibleConcretes(pos, c);
1781 }
1783 void checkConflicts(DiagnosticPosition pos, Symbol sym, TypeSymbol c) {
1784 for (Type ct = c.type; ct != Type.noType ; ct = types.supertype(ct)) {
1785 for (Scope.Entry e = ct.tsym.members().lookup(sym.name); e.scope == ct.tsym.members(); e = e.next()) {
1786 // VM allows methods and variables with differing types
1787 if (sym.kind == e.sym.kind &&
1788 types.isSameType(types.erasure(sym.type), types.erasure(e.sym.type)) &&
1789 sym != e.sym &&
1790 (sym.flags() & Flags.SYNTHETIC) != (e.sym.flags() & Flags.SYNTHETIC) &&
1791 (sym.flags() & BRIDGE) == 0 && (e.sym.flags() & BRIDGE) == 0) {
1792 syntheticError(pos, (e.sym.flags() & SYNTHETIC) == 0 ? e.sym : sym);
1793 return;
1794 }
1795 }
1796 }
1797 }
1799 /** Report a conflict between a user symbol and a synthetic symbol.
1800 */
1801 private void syntheticError(DiagnosticPosition pos, Symbol sym) {
1802 if (!sym.type.isErroneous()) {
1803 if (warnOnSyntheticConflicts) {
1804 log.warning(pos, "synthetic.name.conflict", sym, sym.location());
1805 }
1806 else {
1807 log.error(pos, "synthetic.name.conflict", sym, sym.location());
1808 }
1809 }
1810 }
1812 /** Check that class c does not implement directly or indirectly
1813 * the same parameterized interface with two different argument lists.
1814 * @param pos Position to be used for error reporting.
1815 * @param type The type whose interfaces are checked.
1816 */
1817 void checkClassBounds(DiagnosticPosition pos, Type type) {
1818 checkClassBounds(pos, new HashMap<TypeSymbol,Type>(), type);
1819 }
1820 //where
1821 /** Enter all interfaces of type `type' into the hash table `seensofar'
1822 * with their class symbol as key and their type as value. Make
1823 * sure no class is entered with two different types.
1824 */
1825 void checkClassBounds(DiagnosticPosition pos,
1826 Map<TypeSymbol,Type> seensofar,
1827 Type type) {
1828 if (type.isErroneous()) return;
1829 for (List<Type> l = types.interfaces(type); l.nonEmpty(); l = l.tail) {
1830 Type it = l.head;
1831 Type oldit = seensofar.put(it.tsym, it);
1832 if (oldit != null) {
1833 List<Type> oldparams = oldit.allparams();
1834 List<Type> newparams = it.allparams();
1835 if (!types.containsTypeEquivalent(oldparams, newparams))
1836 log.error(pos, "cant.inherit.diff.arg",
1837 it.tsym, Type.toString(oldparams),
1838 Type.toString(newparams));
1839 }
1840 checkClassBounds(pos, seensofar, it);
1841 }
1842 Type st = types.supertype(type);
1843 if (st != null) checkClassBounds(pos, seensofar, st);
1844 }
1846 /** Enter interface into into set.
1847 * If it existed already, issue a "repeated interface" error.
1848 */
1849 void checkNotRepeated(DiagnosticPosition pos, Type it, Set<Type> its) {
1850 if (its.contains(it))
1851 log.error(pos, "repeated.interface");
1852 else {
1853 its.add(it);
1854 }
1855 }
1857 /* *************************************************************************
1858 * Check annotations
1859 **************************************************************************/
1861 /** Annotation types are restricted to primitives, String, an
1862 * enum, an annotation, Class, Class<?>, Class<? extends
1863 * Anything>, arrays of the preceding.
1864 */
1865 void validateAnnotationType(JCTree restype) {
1866 // restype may be null if an error occurred, so don't bother validating it
1867 if (restype != null) {
1868 validateAnnotationType(restype.pos(), restype.type);
1869 }
1870 }
1872 void validateAnnotationType(DiagnosticPosition pos, Type type) {
1873 if (type.isPrimitive()) return;
1874 if (types.isSameType(type, syms.stringType)) return;
1875 if ((type.tsym.flags() & Flags.ENUM) != 0) return;
1876 if ((type.tsym.flags() & Flags.ANNOTATION) != 0) return;
1877 if (types.lowerBound(type).tsym == syms.classType.tsym) return;
1878 if (types.isArray(type) && !types.isArray(types.elemtype(type))) {
1879 validateAnnotationType(pos, types.elemtype(type));
1880 return;
1881 }
1882 log.error(pos, "invalid.annotation.member.type");
1883 }
1885 /**
1886 * "It is also a compile-time error if any method declared in an
1887 * annotation type has a signature that is override-equivalent to
1888 * that of any public or protected method declared in class Object
1889 * or in the interface annotation.Annotation."
1890 *
1891 * @jls3 9.6 Annotation Types
1892 */
1893 void validateAnnotationMethod(DiagnosticPosition pos, MethodSymbol m) {
1894 for (Type sup = syms.annotationType; sup.tag == CLASS; sup = types.supertype(sup)) {
1895 Scope s = sup.tsym.members();
1896 for (Scope.Entry e = s.lookup(m.name); e.scope != null; e = e.next()) {
1897 if (e.sym.kind == MTH &&
1898 (e.sym.flags() & (PUBLIC | PROTECTED)) != 0 &&
1899 types.overrideEquivalent(m.type, e.sym.type))
1900 log.error(pos, "intf.annotation.member.clash", e.sym, sup);
1901 }
1902 }
1903 }
1905 /** Check the annotations of a symbol.
1906 */
1907 public void validateAnnotations(List<JCAnnotation> annotations, Symbol s) {
1908 if (skipAnnotations) return;
1909 for (JCAnnotation a : annotations)
1910 validateAnnotation(a, s);
1911 }
1913 /** Check the type annotations
1914 */
1915 public void validateTypeAnnotations(List<JCTypeAnnotation> annotations, boolean isTypeParameter) {
1916 if (skipAnnotations) return;
1917 for (JCTypeAnnotation a : annotations)
1918 validateTypeAnnotation(a, isTypeParameter);
1919 }
1921 /** Check an annotation of a symbol.
1922 */
1923 public void validateAnnotation(JCAnnotation a, Symbol s) {
1924 validateAnnotation(a);
1926 if (!annotationApplicable(a, s))
1927 log.error(a.pos(), "annotation.type.not.applicable");
1929 if (a.annotationType.type.tsym == syms.overrideType.tsym) {
1930 if (!isOverrider(s))
1931 log.error(a.pos(), "method.does.not.override.superclass");
1932 }
1933 }
1935 public void validateTypeAnnotation(JCTypeAnnotation a, boolean isTypeParameter) {
1936 if (a.type == null)
1937 throw new AssertionError("annotation tree hasn't been attributed yet: " + a);
1938 validateAnnotation(a);
1940 if (!isTypeAnnotation(a, isTypeParameter))
1941 log.error(a.pos(), "annotation.type.not.applicable");
1942 }
1944 /** Is s a method symbol that overrides a method in a superclass? */
1945 boolean isOverrider(Symbol s) {
1946 if (s.kind != MTH || s.isStatic())
1947 return false;
1948 MethodSymbol m = (MethodSymbol)s;
1949 TypeSymbol owner = (TypeSymbol)m.owner;
1950 for (Type sup : types.closure(owner.type)) {
1951 if (sup == owner.type)
1952 continue; // skip "this"
1953 Scope scope = sup.tsym.members();
1954 for (Scope.Entry e = scope.lookup(m.name); e.scope != null; e = e.next()) {
1955 if (!e.sym.isStatic() && m.overrides(e.sym, owner, types, true))
1956 return true;
1957 }
1958 }
1959 return false;
1960 }
1962 /** Is the annotation applicable to type annotations */
1963 boolean isTypeAnnotation(JCTypeAnnotation a, boolean isTypeParameter) {
1964 Attribute.Compound atTarget =
1965 a.annotationType.type.tsym.attribute(syms.annotationTargetType.tsym);
1966 if (atTarget == null) return true;
1967 Attribute atValue = atTarget.member(names.value);
1968 if (!(atValue instanceof Attribute.Array)) return true; // error recovery
1969 Attribute.Array arr = (Attribute.Array) atValue;
1970 for (Attribute app : arr.values) {
1971 if (!(app instanceof Attribute.Enum)) return true; // recovery
1972 Attribute.Enum e = (Attribute.Enum) app;
1973 if (!isTypeParameter && e.value.name == names.TYPE_USE)
1974 return true;
1975 else if (isTypeParameter && e.value.name == names.TYPE_PARAMETER)
1976 return true;
1977 }
1978 return false;
1979 }
1981 /** Is the annotation applicable to the symbol? */
1982 boolean annotationApplicable(JCAnnotation a, Symbol s) {
1983 Attribute.Compound atTarget =
1984 a.annotationType.type.tsym.attribute(syms.annotationTargetType.tsym);
1985 if (atTarget == null) return true;
1986 Attribute atValue = atTarget.member(names.value);
1987 if (!(atValue instanceof Attribute.Array)) return true; // error recovery
1988 Attribute.Array arr = (Attribute.Array) atValue;
1989 for (Attribute app : arr.values) {
1990 if (!(app instanceof Attribute.Enum)) return true; // recovery
1991 Attribute.Enum e = (Attribute.Enum) app;
1992 if (e.value.name == names.TYPE)
1993 { if (s.kind == TYP) return true; }
1994 else if (e.value.name == names.FIELD)
1995 { if (s.kind == VAR && s.owner.kind != MTH) return true; }
1996 else if (e.value.name == names.METHOD)
1997 { if (s.kind == MTH && !s.isConstructor()) return true; }
1998 else if (e.value.name == names.PARAMETER)
1999 { if (s.kind == VAR &&
2000 s.owner.kind == MTH &&
2001 (s.flags() & PARAMETER) != 0)
2002 return true;
2003 }
2004 else if (e.value.name == names.CONSTRUCTOR)
2005 { if (s.kind == MTH && s.isConstructor()) return true; }
2006 else if (e.value.name == names.LOCAL_VARIABLE)
2007 { if (s.kind == VAR && s.owner.kind == MTH &&
2008 (s.flags() & PARAMETER) == 0)
2009 return true;
2010 }
2011 else if (e.value.name == names.ANNOTATION_TYPE)
2012 { if (s.kind == TYP && (s.flags() & ANNOTATION) != 0)
2013 return true;
2014 }
2015 else if (e.value.name == names.PACKAGE)
2016 { if (s.kind == PCK) return true; }
2017 else if (e.value.name == names.TYPE_USE)
2018 { if (s.kind == TYP ||
2019 s.kind == VAR ||
2020 (s.kind == MTH && !s.isConstructor() &&
2021 s.type.getReturnType().tag != VOID))
2022 return true;
2023 }
2024 else
2025 return true; // recovery
2026 }
2027 return false;
2028 }
2030 /** Check an annotation value.
2031 */
2032 public void validateAnnotation(JCAnnotation a) {
2033 if (a.type.isErroneous()) return;
2035 // collect an inventory of the members
2036 Set<MethodSymbol> members = new HashSet<MethodSymbol>();
2037 for (Scope.Entry e = a.annotationType.type.tsym.members().elems;
2038 e != null;
2039 e = e.sibling)
2040 if (e.sym.kind == MTH)
2041 members.add((MethodSymbol) e.sym);
2043 // count them off as they're annotated
2044 for (JCTree arg : a.args) {
2045 if (arg.getTag() != JCTree.ASSIGN) continue; // recovery
2046 JCAssign assign = (JCAssign) arg;
2047 Symbol m = TreeInfo.symbol(assign.lhs);
2048 if (m == null || m.type.isErroneous()) continue;
2049 if (!members.remove(m))
2050 log.error(assign.lhs.pos(), "duplicate.annotation.member.value",
2051 m.name, a.type);
2052 if (assign.rhs.getTag() == ANNOTATION)
2053 validateAnnotation((JCAnnotation)assign.rhs);
2054 }
2056 // all the remaining ones better have default values
2057 for (MethodSymbol m : members)
2058 if (m.defaultValue == null && !m.type.isErroneous())
2059 log.error(a.pos(), "annotation.missing.default.value",
2060 a.type, m.name);
2062 // special case: java.lang.annotation.Target must not have
2063 // repeated values in its value member
2064 if (a.annotationType.type.tsym != syms.annotationTargetType.tsym ||
2065 a.args.tail == null)
2066 return;
2068 if (a.args.head.getTag() != JCTree.ASSIGN) return; // error recovery
2069 JCAssign assign = (JCAssign) a.args.head;
2070 Symbol m = TreeInfo.symbol(assign.lhs);
2071 if (m.name != names.value) return;
2072 JCTree rhs = assign.rhs;
2073 if (rhs.getTag() != JCTree.NEWARRAY) return;
2074 JCNewArray na = (JCNewArray) rhs;
2075 Set<Symbol> targets = new HashSet<Symbol>();
2076 for (JCTree elem : na.elems) {
2077 if (!targets.add(TreeInfo.symbol(elem))) {
2078 log.error(elem.pos(), "repeated.annotation.target");
2079 }
2080 }
2081 }
2083 void checkDeprecatedAnnotation(DiagnosticPosition pos, Symbol s) {
2084 if (allowAnnotations &&
2085 lint.isEnabled(Lint.LintCategory.DEP_ANN) &&
2086 (s.flags() & DEPRECATED) != 0 &&
2087 !syms.deprecatedType.isErroneous() &&
2088 s.attribute(syms.deprecatedType.tsym) == null) {
2089 log.warning(pos, "missing.deprecated.annotation");
2090 }
2091 }
2093 /* *************************************************************************
2094 * Check for recursive annotation elements.
2095 **************************************************************************/
2097 /** Check for cycles in the graph of annotation elements.
2098 */
2099 void checkNonCyclicElements(JCClassDecl tree) {
2100 if ((tree.sym.flags_field & ANNOTATION) == 0) return;
2101 assert (tree.sym.flags_field & LOCKED) == 0;
2102 try {
2103 tree.sym.flags_field |= LOCKED;
2104 for (JCTree def : tree.defs) {
2105 if (def.getTag() != JCTree.METHODDEF) continue;
2106 JCMethodDecl meth = (JCMethodDecl)def;
2107 checkAnnotationResType(meth.pos(), meth.restype.type);
2108 }
2109 } finally {
2110 tree.sym.flags_field &= ~LOCKED;
2111 tree.sym.flags_field |= ACYCLIC_ANN;
2112 }
2113 }
2115 void checkNonCyclicElementsInternal(DiagnosticPosition pos, TypeSymbol tsym) {
2116 if ((tsym.flags_field & ACYCLIC_ANN) != 0)
2117 return;
2118 if ((tsym.flags_field & LOCKED) != 0) {
2119 log.error(pos, "cyclic.annotation.element");
2120 return;
2121 }
2122 try {
2123 tsym.flags_field |= LOCKED;
2124 for (Scope.Entry e = tsym.members().elems; e != null; e = e.sibling) {
2125 Symbol s = e.sym;
2126 if (s.kind != Kinds.MTH)
2127 continue;
2128 checkAnnotationResType(pos, ((MethodSymbol)s).type.getReturnType());
2129 }
2130 } finally {
2131 tsym.flags_field &= ~LOCKED;
2132 tsym.flags_field |= ACYCLIC_ANN;
2133 }
2134 }
2136 void checkAnnotationResType(DiagnosticPosition pos, Type type) {
2137 switch (type.tag) {
2138 case TypeTags.CLASS:
2139 if ((type.tsym.flags() & ANNOTATION) != 0)
2140 checkNonCyclicElementsInternal(pos, type.tsym);
2141 break;
2142 case TypeTags.ARRAY:
2143 checkAnnotationResType(pos, types.elemtype(type));
2144 break;
2145 default:
2146 break; // int etc
2147 }
2148 }
2150 /* *************************************************************************
2151 * Check for cycles in the constructor call graph.
2152 **************************************************************************/
2154 /** Check for cycles in the graph of constructors calling other
2155 * constructors.
2156 */
2157 void checkCyclicConstructors(JCClassDecl tree) {
2158 Map<Symbol,Symbol> callMap = new HashMap<Symbol, Symbol>();
2160 // enter each constructor this-call into the map
2161 for (List<JCTree> l = tree.defs; l.nonEmpty(); l = l.tail) {
2162 JCMethodInvocation app = TreeInfo.firstConstructorCall(l.head);
2163 if (app == null) continue;
2164 JCMethodDecl meth = (JCMethodDecl) l.head;
2165 if (TreeInfo.name(app.meth) == names._this) {
2166 callMap.put(meth.sym, TreeInfo.symbol(app.meth));
2167 } else {
2168 meth.sym.flags_field |= ACYCLIC;
2169 }
2170 }
2172 // Check for cycles in the map
2173 Symbol[] ctors = new Symbol[0];
2174 ctors = callMap.keySet().toArray(ctors);
2175 for (Symbol caller : ctors) {
2176 checkCyclicConstructor(tree, caller, callMap);
2177 }
2178 }
2180 /** Look in the map to see if the given constructor is part of a
2181 * call cycle.
2182 */
2183 private void checkCyclicConstructor(JCClassDecl tree, Symbol ctor,
2184 Map<Symbol,Symbol> callMap) {
2185 if (ctor != null && (ctor.flags_field & ACYCLIC) == 0) {
2186 if ((ctor.flags_field & LOCKED) != 0) {
2187 log.error(TreeInfo.diagnosticPositionFor(ctor, tree),
2188 "recursive.ctor.invocation");
2189 } else {
2190 ctor.flags_field |= LOCKED;
2191 checkCyclicConstructor(tree, callMap.remove(ctor), callMap);
2192 ctor.flags_field &= ~LOCKED;
2193 }
2194 ctor.flags_field |= ACYCLIC;
2195 }
2196 }
2198 /* *************************************************************************
2199 * Miscellaneous
2200 **************************************************************************/
2202 /**
2203 * Return the opcode of the operator but emit an error if it is an
2204 * error.
2205 * @param pos position for error reporting.
2206 * @param operator an operator
2207 * @param tag a tree tag
2208 * @param left type of left hand side
2209 * @param right type of right hand side
2210 */
2211 int checkOperator(DiagnosticPosition pos,
2212 OperatorSymbol operator,
2213 int tag,
2214 Type left,
2215 Type right) {
2216 if (operator.opcode == ByteCodes.error) {
2217 log.error(pos,
2218 "operator.cant.be.applied",
2219 treeinfo.operatorName(tag),
2220 List.of(left, right));
2221 }
2222 return operator.opcode;
2223 }
2226 /**
2227 * Check for division by integer constant zero
2228 * @param pos Position for error reporting.
2229 * @param operator The operator for the expression
2230 * @param operand The right hand operand for the expression
2231 */
2232 void checkDivZero(DiagnosticPosition pos, Symbol operator, Type operand) {
2233 if (operand.constValue() != null
2234 && lint.isEnabled(Lint.LintCategory.DIVZERO)
2235 && operand.tag <= LONG
2236 && ((Number) (operand.constValue())).longValue() == 0) {
2237 int opc = ((OperatorSymbol)operator).opcode;
2238 if (opc == ByteCodes.idiv || opc == ByteCodes.imod
2239 || opc == ByteCodes.ldiv || opc == ByteCodes.lmod) {
2240 log.warning(pos, "div.zero");
2241 }
2242 }
2243 }
2245 /**
2246 * Check for empty statements after if
2247 */
2248 void checkEmptyIf(JCIf tree) {
2249 if (tree.thenpart.getTag() == JCTree.SKIP && tree.elsepart == null && lint.isEnabled(Lint.LintCategory.EMPTY))
2250 log.warning(tree.thenpart.pos(), "empty.if");
2251 }
2253 /** Check that symbol is unique in given scope.
2254 * @param pos Position for error reporting.
2255 * @param sym The symbol.
2256 * @param s The scope.
2257 */
2258 boolean checkUnique(DiagnosticPosition pos, Symbol sym, Scope s) {
2259 if (sym.type.isErroneous())
2260 return true;
2261 if (sym.owner.name == names.any) return false;
2262 for (Scope.Entry e = s.lookup(sym.name); e.scope == s; e = e.next()) {
2263 if (sym != e.sym &&
2264 sym.kind == e.sym.kind &&
2265 sym.name != names.error &&
2266 (sym.kind != MTH || types.hasSameArgs(types.erasure(sym.type), types.erasure(e.sym.type)))) {
2267 if ((sym.flags() & VARARGS) != (e.sym.flags() & VARARGS))
2268 varargsDuplicateError(pos, sym, e.sym);
2269 else if (sym.kind == MTH && !types.overrideEquivalent(sym.type, e.sym.type))
2270 duplicateErasureError(pos, sym, e.sym);
2271 else
2272 duplicateError(pos, e.sym);
2273 return false;
2274 }
2275 }
2276 return true;
2277 }
2278 //where
2279 /** Report duplicate declaration error.
2280 */
2281 void duplicateErasureError(DiagnosticPosition pos, Symbol sym1, Symbol sym2) {
2282 if (!sym1.type.isErroneous() && !sym2.type.isErroneous()) {
2283 log.error(pos, "name.clash.same.erasure", sym1, sym2);
2284 }
2285 }
2287 /** Check that single-type import is not already imported or top-level defined,
2288 * but make an exception for two single-type imports which denote the same type.
2289 * @param pos Position for error reporting.
2290 * @param sym The symbol.
2291 * @param s The scope
2292 */
2293 boolean checkUniqueImport(DiagnosticPosition pos, Symbol sym, Scope s) {
2294 return checkUniqueImport(pos, sym, s, false);
2295 }
2297 /** Check that static single-type import is not already imported or top-level defined,
2298 * but make an exception for two single-type imports which denote the same type.
2299 * @param pos Position for error reporting.
2300 * @param sym The symbol.
2301 * @param s The scope
2302 * @param staticImport Whether or not this was a static import
2303 */
2304 boolean checkUniqueStaticImport(DiagnosticPosition pos, Symbol sym, Scope s) {
2305 return checkUniqueImport(pos, sym, s, true);
2306 }
2308 /** Check that single-type import is not already imported or top-level defined,
2309 * but make an exception for two single-type imports which denote the same type.
2310 * @param pos Position for error reporting.
2311 * @param sym The symbol.
2312 * @param s The scope.
2313 * @param staticImport Whether or not this was a static import
2314 */
2315 private boolean checkUniqueImport(DiagnosticPosition pos, Symbol sym, Scope s, boolean staticImport) {
2316 for (Scope.Entry e = s.lookup(sym.name); e.scope != null; e = e.next()) {
2317 // is encountered class entered via a class declaration?
2318 boolean isClassDecl = e.scope == s;
2319 if ((isClassDecl || sym != e.sym) &&
2320 sym.kind == e.sym.kind &&
2321 sym.name != names.error) {
2322 if (!e.sym.type.isErroneous()) {
2323 String what = e.sym.toString();
2324 if (!isClassDecl) {
2325 if (staticImport)
2326 log.error(pos, "already.defined.static.single.import", what);
2327 else
2328 log.error(pos, "already.defined.single.import", what);
2329 }
2330 else if (sym != e.sym)
2331 log.error(pos, "already.defined.this.unit", what);
2332 }
2333 return false;
2334 }
2335 }
2336 return true;
2337 }
2339 /** Check that a qualified name is in canonical form (for import decls).
2340 */
2341 public void checkCanonical(JCTree tree) {
2342 if (!isCanonical(tree))
2343 log.error(tree.pos(), "import.requires.canonical",
2344 TreeInfo.symbol(tree));
2345 }
2346 // where
2347 private boolean isCanonical(JCTree tree) {
2348 while (tree.getTag() == JCTree.SELECT) {
2349 JCFieldAccess s = (JCFieldAccess) tree;
2350 if (s.sym.owner != TreeInfo.symbol(s.selected))
2351 return false;
2352 tree = s.selected;
2353 }
2354 return true;
2355 }
2357 private class ConversionWarner extends Warner {
2358 final String key;
2359 final Type found;
2360 final Type expected;
2361 public ConversionWarner(DiagnosticPosition pos, String key, Type found, Type expected) {
2362 super(pos);
2363 this.key = key;
2364 this.found = found;
2365 this.expected = expected;
2366 }
2368 @Override
2369 public void warnUnchecked() {
2370 boolean warned = this.warned;
2371 super.warnUnchecked();
2372 if (warned) return; // suppress redundant diagnostics
2373 Object problem = diags.fragment(key);
2374 Check.this.warnUnchecked(pos(), "prob.found.req", problem, found, expected);
2375 }
2376 }
2378 public Warner castWarner(DiagnosticPosition pos, Type found, Type expected) {
2379 return new ConversionWarner(pos, "unchecked.cast.to.type", found, expected);
2380 }
2382 public Warner convertWarner(DiagnosticPosition pos, Type found, Type expected) {
2383 return new ConversionWarner(pos, "unchecked.assign", found, expected);
2384 }
2385 }
