1 /*
2 * Copyright (c) 1999, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package com.sun.tools.javac.comp;
27
28 import java.util.*;
29 import java.util.function.Supplier;
30
31 import javax.tools.JavaFileManager;
32
33 import com.sun.tools.javac.code.*;
34 import com.sun.tools.javac.code.Attribute.Compound;
35 import com.sun.tools.javac.code.Directive.ExportsDirective;
36 import com.sun.tools.javac.code.Directive.RequiresDirective;
37 import com.sun.tools.javac.code.Source.Feature;
38 import com.sun.tools.javac.comp.Annotate.AnnotationTypeMetadata;
39 import com.sun.tools.javac.jvm.*;
40 import com.sun.tools.javac.resources.CompilerProperties.Errors;
41 import com.sun.tools.javac.resources.CompilerProperties.Fragments;
42 import com.sun.tools.javac.resources.CompilerProperties.Warnings;
43 import com.sun.tools.javac.tree.*;
44 import com.sun.tools.javac.util.*;
45 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticFlag;
46 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
47 import com.sun.tools.javac.util.JCDiagnostic.Error;
48 import com.sun.tools.javac.util.JCDiagnostic.Fragment;
49 import com.sun.tools.javac.util.JCDiagnostic.Warning;
50 import com.sun.tools.javac.util.List;
51
52 import com.sun.tools.javac.code.Lint;
53 import com.sun.tools.javac.code.Lint.LintCategory;
54 import com.sun.tools.javac.code.Scope.WriteableScope;
55 import com.sun.tools.javac.code.Type.*;
56 import com.sun.tools.javac.code.Symbol.*;
57 import com.sun.tools.javac.comp.DeferredAttr.DeferredAttrContext;
58 import com.sun.tools.javac.comp.Infer.FreeTypeListener;
59 import com.sun.tools.javac.tree.JCTree.*;
60
61 import static com.sun.tools.javac.code.Flags.*;
62 import static com.sun.tools.javac.code.Flags.ANNOTATION;
63 import static com.sun.tools.javac.code.Flags.SYNCHRONIZED;
64 import static com.sun.tools.javac.code.Kinds.*;
65 import static com.sun.tools.javac.code.Kinds.Kind.*;
66 import static com.sun.tools.javac.code.Scope.LookupKind.NON_RECURSIVE;
67 import static com.sun.tools.javac.code.TypeTag.*;
68 import static com.sun.tools.javac.code.TypeTag.WILDCARD;
69
70 import static com.sun.tools.javac.tree.JCTree.Tag.*;
71
72 /** Type checking helper class for the attribution phase.
73 *
74 * <p><b>This is NOT part of any supported API.
75 * If you write code that depends on this, you do so at your own risk.
76 * This code and its internal interfaces are subject to change or
77 * deletion without notice.</b>
78 */
79 public class Check {
80 protected static final Context.Key<Check> checkKey = new Context.Key<>();
81
82 private final Names names;
83 private final Log log;
84 private final Resolve rs;
85 private final Symtab syms;
86 private final Enter enter;
87 private final DeferredAttr deferredAttr;
88 private final Infer infer;
89 private final Types types;
90 private final TypeAnnotations typeAnnotations;
91 private final JCDiagnostic.Factory diags;
92 private final JavaFileManager fileManager;
93 private final Source source;
94 private final Target target;
95 private final Profile profile;
96 private final boolean warnOnAnyAccessToMembers;
97
98 // The set of lint options currently in effect. It is initialized
99 // from the context, and then is set/reset as needed by Attr as it
100 // visits all the various parts of the trees during attribution.
101 private Lint lint;
102
103 // The method being analyzed in Attr - it is set/reset as needed by
104 // Attr as it visits new method declarations.
105 private MethodSymbol method;
106
107 public static Check instance(Context context) {
108 Check instance = context.get(checkKey);
109 if (instance == null)
110 instance = new Check(context);
111 return instance;
112 }
113
114 protected Check(Context context) {
115 context.put(checkKey, this);
116
117 names = Names.instance(context);
118 dfltTargetMeta = new Name[] { names.PACKAGE, names.TYPE,
119 names.FIELD, names.METHOD, names.CONSTRUCTOR,
120 names.ANNOTATION_TYPE, names.LOCAL_VARIABLE, names.PARAMETER};
121 log = Log.instance(context);
122 rs = Resolve.instance(context);
123 syms = Symtab.instance(context);
124 enter = Enter.instance(context);
125 deferredAttr = DeferredAttr.instance(context);
126 infer = Infer.instance(context);
127 types = Types.instance(context);
128 typeAnnotations = TypeAnnotations.instance(context);
129 diags = JCDiagnostic.Factory.instance(context);
130 Options options = Options.instance(context);
131 lint = Lint.instance(context);
132 fileManager = context.get(JavaFileManager.class);
133
134 source = Source.instance(context);
135 target = Target.instance(context);
136 warnOnAnyAccessToMembers = options.isSet("warnOnAccessToMembers");
137
138 Target target = Target.instance(context);
139 syntheticNameChar = target.syntheticNameChar();
140
141 profile = Profile.instance(context);
142
143 boolean verboseDeprecated = lint.isEnabled(LintCategory.DEPRECATION);
144 boolean verboseRemoval = lint.isEnabled(LintCategory.REMOVAL);
145 boolean verboseUnchecked = lint.isEnabled(LintCategory.UNCHECKED);
146 boolean enforceMandatoryWarnings = true;
147
148 deprecationHandler = new MandatoryWarningHandler(log, verboseDeprecated,
149 enforceMandatoryWarnings, "deprecated", LintCategory.DEPRECATION);
150 removalHandler = new MandatoryWarningHandler(log, verboseRemoval,
151 enforceMandatoryWarnings, "removal", LintCategory.REMOVAL);
152 uncheckedHandler = new MandatoryWarningHandler(log, verboseUnchecked,
153 enforceMandatoryWarnings, "unchecked", LintCategory.UNCHECKED);
154 sunApiHandler = new MandatoryWarningHandler(log, false,
155 enforceMandatoryWarnings, "sunapi", null);
156
157 deferredLintHandler = DeferredLintHandler.instance(context);
158 }
159
160 /** Character for synthetic names
161 */
162 char syntheticNameChar;
163
164 /** A table mapping flat names of all compiled classes for each module in this run
165 * to their symbols; maintained from outside.
166 */
167 private Map<Pair<ModuleSymbol, Name>,ClassSymbol> compiled = new HashMap<>();
168
169 /** A handler for messages about deprecated usage.
170 */
171 private MandatoryWarningHandler deprecationHandler;
172
173 /** A handler for messages about deprecated-for-removal usage.
174 */
175 private MandatoryWarningHandler removalHandler;
176
177 /** A handler for messages about unchecked or unsafe usage.
178 */
179 private MandatoryWarningHandler uncheckedHandler;
180
181 /** A handler for messages about using proprietary API.
182 */
183 private MandatoryWarningHandler sunApiHandler;
184
185 /** A handler for deferred lint warnings.
186 */
187 private DeferredLintHandler deferredLintHandler;
188
189 /* *************************************************************************
190 * Errors and Warnings
191 **************************************************************************/
192
193 Lint setLint(Lint newLint) {
194 Lint prev = lint;
195 lint = newLint;
196 return prev;
197 }
198
199 MethodSymbol setMethod(MethodSymbol newMethod) {
200 MethodSymbol prev = method;
201 method = newMethod;
202 return prev;
203 }
204
205 /** Warn about deprecated symbol.
206 * @param pos Position to be used for error reporting.
207 * @param sym The deprecated symbol.
208 */
209 void warnDeprecated(DiagnosticPosition pos, Symbol sym) {
210 if (sym.isDeprecatedForRemoval()) {
211 if (!lint.isSuppressed(LintCategory.REMOVAL)) {
212 if (sym.kind == MDL) {
213 removalHandler.report(pos, Warnings.HasBeenDeprecatedForRemovalModule(sym));
214 } else {
215 removalHandler.report(pos, Warnings.HasBeenDeprecatedForRemoval(sym, sym.location()));
216 }
217 }
218 } else if (!lint.isSuppressed(LintCategory.DEPRECATION)) {
219 if (sym.kind == MDL) {
220 deprecationHandler.report(pos, Warnings.HasBeenDeprecatedModule(sym));
221 } else {
222 deprecationHandler.report(pos, Warnings.HasBeenDeprecated(sym, sym.location()));
223 }
224 }
225 }
226
227 /** Warn about unchecked operation.
228 * @param pos Position to be used for error reporting.
229 * @param msg A string describing the problem.
230 */
231 public void warnUnchecked(DiagnosticPosition pos, Warning warnKey) {
232 if (!lint.isSuppressed(LintCategory.UNCHECKED))
233 uncheckedHandler.report(pos, warnKey);
234 }
235
236 /** Warn about unsafe vararg method decl.
237 * @param pos Position to be used for error reporting.
238 */
239 void warnUnsafeVararg(DiagnosticPosition pos, Warning warnKey) {
240 if (lint.isEnabled(LintCategory.VARARGS))
241 log.warning(LintCategory.VARARGS, pos, warnKey);
242 }
243
244 public void warnStatic(DiagnosticPosition pos, Warning warnKey) {
245 if (lint.isEnabled(LintCategory.STATIC))
246 log.warning(LintCategory.STATIC, pos, warnKey);
247 }
248
249 /** Warn about division by integer constant zero.
250 * @param pos Position to be used for error reporting.
251 */
252 void warnDivZero(DiagnosticPosition pos) {
253 if (lint.isEnabled(LintCategory.DIVZERO))
254 log.warning(LintCategory.DIVZERO, pos, Warnings.DivZero);
255 }
256
257 /**
258 * Report any deferred diagnostics.
259 */
260 public void reportDeferredDiagnostics() {
261 deprecationHandler.reportDeferredDiagnostic();
262 removalHandler.reportDeferredDiagnostic();
263 uncheckedHandler.reportDeferredDiagnostic();
264 sunApiHandler.reportDeferredDiagnostic();
265 }
266
267
268 /** Report a failure to complete a class.
269 * @param pos Position to be used for error reporting.
270 * @param ex The failure to report.
271 */
272 public Type completionError(DiagnosticPosition pos, CompletionFailure ex) {
273 log.error(JCDiagnostic.DiagnosticFlag.NON_DEFERRABLE, pos, Errors.CantAccess(ex.sym, ex.getDetailValue()));
274 return syms.errType;
275 }
276
277 /** Report an error that wrong type tag was found.
278 * @param pos Position to be used for error reporting.
279 * @param required An internationalized string describing the type tag
280 * required.
281 * @param found The type that was found.
282 */
283 Type typeTagError(DiagnosticPosition pos, JCDiagnostic required, Object found) {
284 // this error used to be raised by the parser,
285 // but has been delayed to this point:
286 if (found instanceof Type && ((Type)found).hasTag(VOID)) {
287 log.error(pos, Errors.IllegalStartOfType);
288 return syms.errType;
289 }
290 log.error(pos, Errors.TypeFoundReq(found, required));
291 return types.createErrorType(found instanceof Type ? (Type)found : syms.errType);
292 }
293
294 /** Report an error that symbol cannot be referenced before super
295 * has been called.
296 * @param pos Position to be used for error reporting.
297 * @param sym The referenced symbol.
298 */
299 void earlyRefError(DiagnosticPosition pos, Symbol sym) {
300 log.error(pos, Errors.CantRefBeforeCtorCalled(sym));
301 }
302
303 /** Report duplicate declaration error.
304 */
305 void duplicateError(DiagnosticPosition pos, Symbol sym) {
306 if (!sym.type.isErroneous()) {
307 Symbol location = sym.location();
308 if (location.kind == MTH &&
309 ((MethodSymbol)location).isStaticOrInstanceInit()) {
310 log.error(pos,
311 Errors.AlreadyDefinedInClinit(kindName(sym),
312 sym,
313 kindName(sym.location()),
314 kindName(sym.location().enclClass()),
315 sym.location().enclClass()));
316 } else {
317 log.error(pos,
318 Errors.AlreadyDefined(kindName(sym),
319 sym,
320 kindName(sym.location()),
321 sym.location()));
322 }
323 }
324 }
325
326 /** Report array/varargs duplicate declaration
327 */
328 void varargsDuplicateError(DiagnosticPosition pos, Symbol sym1, Symbol sym2) {
329 if (!sym1.type.isErroneous() && !sym2.type.isErroneous()) {
330 log.error(pos, Errors.ArrayAndVarargs(sym1, sym2, sym2.location()));
331 }
332 }
333
334 /* ************************************************************************
335 * duplicate declaration checking
336 *************************************************************************/
337
338 /** Check that variable does not hide variable with same name in
339 * immediately enclosing local scope.
340 * @param pos Position for error reporting.
341 * @param v The symbol.
342 * @param s The scope.
343 */
344 void checkTransparentVar(DiagnosticPosition pos, VarSymbol v, Scope s) {
345 for (Symbol sym : s.getSymbolsByName(v.name)) {
346 if (sym.owner != v.owner) break;
347 if (sym.kind == VAR &&
348 sym.owner.kind.matches(KindSelector.VAL_MTH) &&
349 v.name != names.error) {
350 duplicateError(pos, sym);
351 return;
352 }
353 }
354 }
355
356 /** Check that a class or interface does not hide a class or
357 * interface with same name in immediately enclosing local scope.
358 * @param pos Position for error reporting.
359 * @param c The symbol.
360 * @param s The scope.
361 */
362 void checkTransparentClass(DiagnosticPosition pos, ClassSymbol c, Scope s) {
363 for (Symbol sym : s.getSymbolsByName(c.name)) {
364 if (sym.owner != c.owner) break;
365 if (sym.kind == TYP && !sym.type.hasTag(TYPEVAR) &&
366 sym.owner.kind.matches(KindSelector.VAL_MTH) &&
367 c.name != names.error) {
368 duplicateError(pos, sym);
369 return;
370 }
371 }
372 }
373
374 /** Check that class does not have the same name as one of
375 * its enclosing classes, or as a class defined in its enclosing scope.
376 * return true if class is unique in its enclosing scope.
377 * @param pos Position for error reporting.
378 * @param name The class name.
379 * @param s The enclosing scope.
380 */
381 boolean checkUniqueClassName(DiagnosticPosition pos, Name name, Scope s) {
382 for (Symbol sym : s.getSymbolsByName(name, NON_RECURSIVE)) {
383 if (sym.kind == TYP && sym.name != names.error) {
384 duplicateError(pos, sym);
385 return false;
386 }
387 }
388 for (Symbol sym = s.owner; sym != null; sym = sym.owner) {
389 if (sym.kind == TYP && sym.name == name && sym.name != names.error) {
390 duplicateError(pos, sym);
391 return true;
392 }
393 }
394 return true;
395 }
396
397 /* *************************************************************************
398 * Class name generation
399 **************************************************************************/
400
401
402 private Map<Pair<Name, Name>, Integer> localClassNameIndexes = new HashMap<>();
403
404 /** Return name of local class.
405 * This is of the form {@code <enclClass> $ n <classname> }
406 * where
407 * enclClass is the flat name of the enclosing class,
408 * classname is the simple name of the local class
409 */
410 Name localClassName(ClassSymbol c) {
411 Name enclFlatname = c.owner.enclClass().flatname;
412 String enclFlatnameStr = enclFlatname.toString();
413 Pair<Name, Name> key = new Pair<>(enclFlatname, c.name);
414 Integer index = localClassNameIndexes.get(key);
415 for (int i = (index == null) ? 1 : index; ; i++) {
416 Name flatname = names.fromString(enclFlatnameStr
417 + syntheticNameChar + i + c.name);
418 if (getCompiled(c.packge().modle, flatname) == null) {
419 localClassNameIndexes.put(key, i + 1);
420 return flatname;
421 }
422 }
423 }
424
425 void clearLocalClassNameIndexes(ClassSymbol c) {
426 if (c.owner != null && c.owner.kind != NIL) {
427 localClassNameIndexes.remove(new Pair<>(
428 c.owner.enclClass().flatname, c.name));
429 }
430 }
431
432 public void newRound() {
433 compiled.clear();
434 localClassNameIndexes.clear();
435 }
436
437 public void putCompiled(ClassSymbol csym) {
438 compiled.put(Pair.of(csym.packge().modle, csym.flatname), csym);
439 }
440
441 public ClassSymbol getCompiled(ClassSymbol csym) {
442 return compiled.get(Pair.of(csym.packge().modle, csym.flatname));
443 }
444
445 public ClassSymbol getCompiled(ModuleSymbol msym, Name flatname) {
446 return compiled.get(Pair.of(msym, flatname));
447 }
448
449 public void removeCompiled(ClassSymbol csym) {
450 compiled.remove(Pair.of(csym.packge().modle, csym.flatname));
451 }
452
453 /* *************************************************************************
454 * Type Checking
455 **************************************************************************/
456
457 /**
458 * A check context is an object that can be used to perform compatibility
459 * checks - depending on the check context, meaning of 'compatibility' might
460 * vary significantly.
461 */
462 public interface CheckContext {
463 /**
464 * Is type 'found' compatible with type 'req' in given context
465 */
466 boolean compatible(Type found, Type req, Warner warn);
467 /**
468 * Report a check error
469 */
470 void report(DiagnosticPosition pos, JCDiagnostic details);
471 /**
472 * Obtain a warner for this check context
473 */
474 public Warner checkWarner(DiagnosticPosition pos, Type found, Type req);
475
476 public InferenceContext inferenceContext();
477
478 public DeferredAttr.DeferredAttrContext deferredAttrContext();
479 }
480
481 /**
482 * This class represent a check context that is nested within another check
483 * context - useful to check sub-expressions. The default behavior simply
484 * redirects all method calls to the enclosing check context leveraging
485 * the forwarding pattern.
486 */
487 static class NestedCheckContext implements CheckContext {
488 CheckContext enclosingContext;
489
490 NestedCheckContext(CheckContext enclosingContext) {
491 this.enclosingContext = enclosingContext;
492 }
493
494 public boolean compatible(Type found, Type req, Warner warn) {
495 return enclosingContext.compatible(found, req, warn);
496 }
497
498 public void report(DiagnosticPosition pos, JCDiagnostic details) {
499 enclosingContext.report(pos, details);
500 }
501
502 public Warner checkWarner(DiagnosticPosition pos, Type found, Type req) {
503 return enclosingContext.checkWarner(pos, found, req);
504 }
505
506 public InferenceContext inferenceContext() {
507 return enclosingContext.inferenceContext();
508 }
509
510 public DeferredAttrContext deferredAttrContext() {
511 return enclosingContext.deferredAttrContext();
512 }
513 }
514
515 /**
516 * Check context to be used when evaluating assignment/return statements
517 */
518 CheckContext basicHandler = new CheckContext() {
519 public void report(DiagnosticPosition pos, JCDiagnostic details) {
520 log.error(pos, Errors.ProbFoundReq(details));
521 }
522 public boolean compatible(Type found, Type req, Warner warn) {
523 return types.isAssignable(found, req, warn);
524 }
525
526 public Warner checkWarner(DiagnosticPosition pos, Type found, Type req) {
527 return convertWarner(pos, found, req);
528 }
529
530 public InferenceContext inferenceContext() {
531 return infer.emptyContext;
532 }
533
534 public DeferredAttrContext deferredAttrContext() {
535 return deferredAttr.emptyDeferredAttrContext;
536 }
537
538 @Override
539 public String toString() {
540 return "CheckContext: basicHandler";
541 }
542 };
543
544 /** Check that a given type is assignable to a given proto-type.
545 * If it is, return the type, otherwise return errType.
546 * @param pos Position to be used for error reporting.
547 * @param found The type that was found.
548 * @param req The type that was required.
549 */
550 public Type checkType(DiagnosticPosition pos, Type found, Type req) {
551 return checkType(pos, found, req, basicHandler);
552 }
553
554 Type checkType(final DiagnosticPosition pos, final Type found, final Type req, final CheckContext checkContext) {
555 final InferenceContext inferenceContext = checkContext.inferenceContext();
556 if (inferenceContext.free(req) || inferenceContext.free(found)) {
557 inferenceContext.addFreeTypeListener(List.of(req, found),
558 solvedContext -> checkType(pos, solvedContext.asInstType(found), solvedContext.asInstType(req), checkContext));
559 }
560 if (req.hasTag(ERROR))
561 return req;
562 if (req.hasTag(NONE))
563 return found;
564 if (checkContext.compatible(found, req, checkContext.checkWarner(pos, found, req))) {
565 return found;
566 } else {
567 if (found.isNumeric() && req.isNumeric()) {
568 checkContext.report(pos, diags.fragment(Fragments.PossibleLossOfPrecision(found, req)));
569 return types.createErrorType(found);
570 }
571 checkContext.report(pos, diags.fragment(Fragments.InconvertibleTypes(found, req)));
572 return types.createErrorType(found);
573 }
574 }
575
576 /** Check that a given type can be cast to a given target type.
577 * Return the result of the cast.
578 * @param pos Position to be used for error reporting.
579 * @param found The type that is being cast.
580 * @param req The target type of the cast.
581 */
582 Type checkCastable(DiagnosticPosition pos, Type found, Type req) {
583 return checkCastable(pos, found, req, basicHandler);
584 }
585 Type checkCastable(DiagnosticPosition pos, Type found, Type req, CheckContext checkContext) {
586 if (types.isCastable(found, req, castWarner(pos, found, req))) {
587 return req;
588 } else {
589 checkContext.report(pos, diags.fragment(Fragments.InconvertibleTypes(found, req)));
590 return types.createErrorType(found);
591 }
592 }
593
594 /** Check for redundant casts (i.e. where source type is a subtype of target type)
595 * The problem should only be reported for non-292 cast
596 */
597 public void checkRedundantCast(Env<AttrContext> env, final JCTypeCast tree) {
598 if (!tree.type.isErroneous()
599 && types.isSameType(tree.expr.type, tree.clazz.type)
600 && !(ignoreAnnotatedCasts && TreeInfo.containsTypeAnnotation(tree.clazz))
601 && !is292targetTypeCast(tree)) {
602 deferredLintHandler.report(() -> {
603 if (lint.isEnabled(LintCategory.CAST))
604 log.warning(LintCategory.CAST,
605 tree.pos(), Warnings.RedundantCast(tree.clazz.type));
606 });
607 }
608 }
609 //where
610 private boolean is292targetTypeCast(JCTypeCast tree) {
611 boolean is292targetTypeCast = false;
612 JCExpression expr = TreeInfo.skipParens(tree.expr);
613 if (expr.hasTag(APPLY)) {
614 JCMethodInvocation apply = (JCMethodInvocation)expr;
615 Symbol sym = TreeInfo.symbol(apply.meth);
616 is292targetTypeCast = sym != null &&
617 sym.kind == MTH &&
618 (sym.flags() & HYPOTHETICAL) != 0;
619 }
620 return is292targetTypeCast;
621 }
622
623 private static final boolean ignoreAnnotatedCasts = true;
624
625 /** Check that a type is within some bounds.
626 *
627 * Used in TypeApply to verify that, e.g., X in {@code V<X>} is a valid
628 * type argument.
629 * @param a The type that should be bounded by bs.
630 * @param bound The bound.
631 */
632 private boolean checkExtends(Type a, Type bound) {
633 if (a.isUnbound()) {
634 return true;
635 } else if (!a.hasTag(WILDCARD)) {
636 a = types.cvarUpperBound(a);
637 return types.isSubtype(a, bound);
638 } else if (a.isExtendsBound()) {
639 return types.isCastable(bound, types.wildUpperBound(a), types.noWarnings);
640 } else if (a.isSuperBound()) {
641 return !types.notSoftSubtype(types.wildLowerBound(a), bound);
642 }
643 return true;
644 }
645
646 /** Check that type is different from 'void'.
647 * @param pos Position to be used for error reporting.
648 * @param t The type to be checked.
649 */
650 Type checkNonVoid(DiagnosticPosition pos, Type t) {
651 if (t.hasTag(VOID)) {
652 log.error(pos, Errors.VoidNotAllowedHere);
653 return types.createErrorType(t);
654 } else {
655 return t;
656 }
657 }
658
659 Type checkClassOrArrayType(DiagnosticPosition pos, Type t) {
660 if (!t.hasTag(CLASS) && !t.hasTag(ARRAY) && !t.hasTag(ERROR)) {
661 return typeTagError(pos,
662 diags.fragment(Fragments.TypeReqClassArray),
663 asTypeParam(t));
664 } else {
665 return t;
666 }
667 }
668
669 /** Check that type is a class or interface type.
670 * @param pos Position to be used for error reporting.
671 * @param t The type to be checked.
672 */
673 Type checkClassType(DiagnosticPosition pos, Type t) {
674 if (!t.hasTag(CLASS) && !t.hasTag(ERROR)) {
675 return typeTagError(pos,
676 diags.fragment(Fragments.TypeReqClass),
677 asTypeParam(t));
678 } else {
679 return t;
680 }
681 }
682 //where
683 private Object asTypeParam(Type t) {
684 return (t.hasTag(TYPEVAR))
685 ? diags.fragment(Fragments.TypeParameter(t))
686 : t;
687 }
688
689 /** Check that type is a valid qualifier for a constructor reference expression
690 */
691 Type checkConstructorRefType(DiagnosticPosition pos, Type t) {
692 t = checkClassOrArrayType(pos, t);
693 if (t.hasTag(CLASS)) {
694 if ((t.tsym.flags() & (ABSTRACT | INTERFACE)) != 0) {
695 log.error(pos, Errors.AbstractCantBeInstantiated(t.tsym));
696 t = types.createErrorType(t);
697 } else if ((t.tsym.flags() & ENUM) != 0) {
698 log.error(pos, Errors.EnumCantBeInstantiated);
699 t = types.createErrorType(t);
700 } else {
701 t = checkClassType(pos, t, true);
702 }
703 } else if (t.hasTag(ARRAY)) {
704 if (!types.isReifiable(((ArrayType)t).elemtype)) {
705 log.error(pos, Errors.GenericArrayCreation);
706 t = types.createErrorType(t);
707 }
708 }
709 return t;
710 }
711
712 /** Check that type is a class or interface type.
713 * @param pos Position to be used for error reporting.
714 * @param t The type to be checked.
715 * @param noBounds True if type bounds are illegal here.
716 */
717 Type checkClassType(DiagnosticPosition pos, Type t, boolean noBounds) {
718 t = checkClassType(pos, t);
719 if (noBounds && t.isParameterized()) {
720 List<Type> args = t.getTypeArguments();
721 while (args.nonEmpty()) {
722 if (args.head.hasTag(WILDCARD))
723 return typeTagError(pos,
724 diags.fragment(Fragments.TypeReqExact),
725 args.head);
726 args = args.tail;
727 }
728 }
729 return t;
730 }
731
732 /** Check that type is a reference type, i.e. a class, interface or array type
733 * or a type variable.
734 * @param pos Position to be used for error reporting.
735 * @param t The type to be checked.
736 */
737 Type checkRefType(DiagnosticPosition pos, Type t) {
738 if (t.isReference())
739 return t;
740 else
741 return typeTagError(pos,
742 diags.fragment(Fragments.TypeReqRef),
743 t);
744 }
745
746 /** Check that each type is a reference type, i.e. a class, interface or array type
747 * or a type variable.
748 * @param trees Original trees, used for error reporting.
749 * @param types The types to be checked.
750 */
751 List<Type> checkRefTypes(List<JCExpression> trees, List<Type> types) {
752 List<JCExpression> tl = trees;
753 for (List<Type> l = types; l.nonEmpty(); l = l.tail) {
754 l.head = checkRefType(tl.head.pos(), l.head);
755 tl = tl.tail;
756 }
757 return types;
758 }
759
760 /** Check that type is a null or reference type.
761 * @param pos Position to be used for error reporting.
762 * @param t The type to be checked.
763 */
764 Type checkNullOrRefType(DiagnosticPosition pos, Type t) {
765 if (t.isReference() || t.hasTag(BOT))
766 return t;
767 else
768 return typeTagError(pos,
769 diags.fragment(Fragments.TypeReqRef),
770 t);
771 }
772
773 /** Check that flag set does not contain elements of two conflicting sets. s
774 * Return true if it doesn't.
775 * @param pos Position to be used for error reporting.
776 * @param flags The set of flags to be checked.
777 * @param set1 Conflicting flags set #1.
778 * @param set2 Conflicting flags set #2.
779 */
780 boolean checkDisjoint(DiagnosticPosition pos, long flags, long set1, long set2) {
781 if ((flags & set1) != 0 && (flags & set2) != 0) {
782 log.error(pos,
783 Errors.IllegalCombinationOfModifiers(asFlagSet(TreeInfo.firstFlag(flags & set1)),
784 asFlagSet(TreeInfo.firstFlag(flags & set2))));
785 return false;
786 } else
787 return true;
788 }
789
790 /** Check that usage of diamond operator is correct (i.e. diamond should not
791 * be used with non-generic classes or in anonymous class creation expressions)
792 */
793 Type checkDiamond(JCNewClass tree, Type t) {
794 if (!TreeInfo.isDiamond(tree) ||
795 t.isErroneous()) {
796 return checkClassType(tree.clazz.pos(), t, true);
797 } else {
798 if (tree.def != null && !Feature.DIAMOND_WITH_ANONYMOUS_CLASS_CREATION.allowedInSource(source)) {
799 log.error(DiagnosticFlag.SOURCE_LEVEL, tree.clazz.pos(),
800 Errors.CantApplyDiamond1(t, Feature.DIAMOND_WITH_ANONYMOUS_CLASS_CREATION.fragment(source.name)));
801 }
802 if (t.tsym.type.getTypeArguments().isEmpty()) {
803 log.error(tree.clazz.pos(),
804 Errors.CantApplyDiamond1(t,
805 Fragments.DiamondNonGeneric(t)));
806 return types.createErrorType(t);
807 } else if (tree.typeargs != null &&
808 tree.typeargs.nonEmpty()) {
809 log.error(tree.clazz.pos(),
810 Errors.CantApplyDiamond1(t,
811 Fragments.DiamondAndExplicitParams(t)));
812 return types.createErrorType(t);
813 } else {
814 return t;
815 }
816 }
817 }
818
819 /** Check that the type inferred using the diamond operator does not contain
820 * non-denotable types such as captured types or intersection types.
821 * @param t the type inferred using the diamond operator
822 * @return the (possibly empty) list of non-denotable types.
823 */
824 List<Type> checkDiamondDenotable(ClassType t) {
825 ListBuffer<Type> buf = new ListBuffer<>();
826 for (Type arg : t.allparams()) {
827 if (!checkDenotable(arg)) {
828 buf.append(arg);
829 }
830 }
831 return buf.toList();
832 }
833
834 public boolean checkDenotable(Type t) {
835 return denotableChecker.visit(t, null);
836 }
837 // where
838
839 /** diamondTypeChecker: A type visitor that descends down the given type looking for non-denotable
840 * types. The visit methods return false as soon as a non-denotable type is encountered and true
841 * otherwise.
842 */
843 private static final Types.SimpleVisitor<Boolean, Void> denotableChecker = new Types.SimpleVisitor<Boolean, Void>() {
844 @Override
845 public Boolean visitType(Type t, Void s) {
846 return true;
847 }
848 @Override
849 public Boolean visitClassType(ClassType t, Void s) {
850 if (t.isUnion() || t.isIntersection()) {
851 return false;
852 }
853 for (Type targ : t.allparams()) {
854 if (!visit(targ, s)) {
855 return false;
856 }
857 }
858 return true;
859 }
860
861 @Override
862 public Boolean visitTypeVar(TypeVar t, Void s) {
863 /* Any type variable mentioned in the inferred type must have been declared as a type parameter
864 (i.e cannot have been produced by inference (18.4))
865 */
866 return (t.tsym.flags() & SYNTHETIC) == 0;
867 }
868
869 @Override
870 public Boolean visitCapturedType(CapturedType t, Void s) {
871 /* Any type variable mentioned in the inferred type must have been declared as a type parameter
872 (i.e cannot have been produced by capture conversion (5.1.10))
873 */
874 return false;
875 }
876
877 @Override
878 public Boolean visitArrayType(ArrayType t, Void s) {
879 return visit(t.elemtype, s);
880 }
881
882 @Override
883 public Boolean visitWildcardType(WildcardType t, Void s) {
884 return visit(t.type, s);
885 }
886 };
887
888 void checkVarargsMethodDecl(Env<AttrContext> env, JCMethodDecl tree) {
889 MethodSymbol m = tree.sym;
890 boolean hasTrustMeAnno = m.attribute(syms.trustMeType.tsym) != null;
891 Type varargElemType = null;
892 if (m.isVarArgs()) {
893 varargElemType = types.elemtype(tree.params.last().type);
894 }
895 if (hasTrustMeAnno && !isTrustMeAllowedOnMethod(m)) {
896 if (varargElemType != null) {
897 JCDiagnostic msg = Feature.PRIVATE_SAFE_VARARGS.allowedInSource(source) ?
898 diags.fragment(Fragments.VarargsTrustmeOnVirtualVarargs(m)) :
899 diags.fragment(Fragments.VarargsTrustmeOnVirtualVarargsFinalOnly(m));
900 log.error(tree,
901 Errors.VarargsInvalidTrustmeAnno(syms.trustMeType.tsym,
902 msg));
903 } else {
904 log.error(tree,
905 Errors.VarargsInvalidTrustmeAnno(syms.trustMeType.tsym,
906 Fragments.VarargsTrustmeOnNonVarargsMeth(m)));
907 }
908 } else if (hasTrustMeAnno && varargElemType != null &&
909 types.isReifiable(varargElemType)) {
910 warnUnsafeVararg(tree, Warnings.VarargsRedundantTrustmeAnno(
911 syms.trustMeType.tsym,
912 diags.fragment(Fragments.VarargsTrustmeOnReifiableVarargs(varargElemType))));
913 }
914 else if (!hasTrustMeAnno && varargElemType != null &&
915 !types.isReifiable(varargElemType)) {
916 warnUnchecked(tree.params.head.pos(), Warnings.UncheckedVarargsNonReifiableType(varargElemType));
917 }
918 }
919 //where
920 private boolean isTrustMeAllowedOnMethod(Symbol s) {
921 return (s.flags() & VARARGS) != 0 &&
922 (s.isConstructor() ||
923 (s.flags() & (STATIC | FINAL |
924 (Feature.PRIVATE_SAFE_VARARGS.allowedInSource(source) ? PRIVATE : 0) )) != 0);
925 }
926
927 Type checkLocalVarType(DiagnosticPosition pos, Type t, Name name) {
928 //check that resulting type is not the null type
929 if (t.hasTag(BOT)) {
930 log.error(pos, Errors.CantInferLocalVarType(name, Fragments.LocalCantInferNull));
931 return types.createErrorType(t);
932 } else if (t.hasTag(VOID)) {
933 log.error(pos, Errors.CantInferLocalVarType(name, Fragments.LocalCantInferVoid));
934 return types.createErrorType(t);
935 }
936
937 //upward project the initializer type
938 return types.upward(t, types.captures(t));
939 }
940
941 Type checkMethod(final Type mtype,
942 final Symbol sym,
943 final Env<AttrContext> env,
944 final List<JCExpression> argtrees,
945 final List<Type> argtypes,
946 final boolean useVarargs,
947 InferenceContext inferenceContext) {
948 // System.out.println("call : " + env.tree);
949 // System.out.println("method : " + owntype);
950 // System.out.println("actuals: " + argtypes);
951 if (inferenceContext.free(mtype)) {
952 inferenceContext.addFreeTypeListener(List.of(mtype),
953 solvedContext -> checkMethod(solvedContext.asInstType(mtype), sym, env, argtrees, argtypes, useVarargs, solvedContext));
954 return mtype;
955 }
956 Type owntype = mtype;
957 List<Type> formals = owntype.getParameterTypes();
958 List<Type> nonInferred = sym.type.getParameterTypes();
959 if (nonInferred.length() != formals.length()) nonInferred = formals;
960 Type last = useVarargs ? formals.last() : null;
961 if (sym.name == names.init && sym.owner == syms.enumSym) {
962 formals = formals.tail.tail;
963 nonInferred = nonInferred.tail.tail;
964 }
965 if ((sym.flags() & ANONCONSTR_BASED) != 0) {
966 formals = formals.tail;
967 nonInferred = nonInferred.tail;
968 }
969 List<JCExpression> args = argtrees;
970 if (args != null) {
971 //this is null when type-checking a method reference
972 while (formals.head != last) {
973 JCTree arg = args.head;
974 Warner warn = convertWarner(arg.pos(), arg.type, nonInferred.head);
975 assertConvertible(arg, arg.type, formals.head, warn);
976 args = args.tail;
977 formals = formals.tail;
978 nonInferred = nonInferred.tail;
979 }
980 if (useVarargs) {
981 Type varArg = types.elemtype(last);
982 while (args.tail != null) {
983 JCTree arg = args.head;
984 Warner warn = convertWarner(arg.pos(), arg.type, varArg);
985 assertConvertible(arg, arg.type, varArg, warn);
986 args = args.tail;
987 }
988 } else if ((sym.flags() & (VARARGS | SIGNATURE_POLYMORPHIC)) == VARARGS) {
989 // non-varargs call to varargs method
990 Type varParam = owntype.getParameterTypes().last();
991 Type lastArg = argtypes.last();
992 if (types.isSubtypeUnchecked(lastArg, types.elemtype(varParam)) &&
993 !types.isSameType(types.erasure(varParam), types.erasure(lastArg)))
994 log.warning(argtrees.last().pos(),
995 Warnings.InexactNonVarargsCall(types.elemtype(varParam),varParam));
996 }
997 }
998 if (useVarargs) {
999 Type argtype = owntype.getParameterTypes().last();
1000 if (!types.isReifiable(argtype) &&
1001 (sym.baseSymbol().attribute(syms.trustMeType.tsym) == null ||
1002 !isTrustMeAllowedOnMethod(sym))) {
1003 warnUnchecked(env.tree.pos(), Warnings.UncheckedGenericArrayCreation(argtype));
1004 }
1005 TreeInfo.setVarargsElement(env.tree, types.elemtype(argtype));
1006 }
1007 return owntype;
1008 }
1009 //where
1010 private void assertConvertible(JCTree tree, Type actual, Type formal, Warner warn) {
1011 if (types.isConvertible(actual, formal, warn))
1012 return;
1013
1014 if (formal.isCompound()
1015 && types.isSubtype(actual, types.supertype(formal))
1016 && types.isSubtypeUnchecked(actual, types.interfaces(formal), warn))
1017 return;
1018 }
1019
1020 /**
1021 * Check that type 't' is a valid instantiation of a generic class
1022 * (see JLS 4.5)
1023 *
1024 * @param t class type to be checked
1025 * @return true if 't' is well-formed
1026 */
1027 public boolean checkValidGenericType(Type t) {
1028 return firstIncompatibleTypeArg(t) == null;
1029 }
1030 //WHERE
1031 private Type firstIncompatibleTypeArg(Type type) {
1032 List<Type> formals = type.tsym.type.allparams();
1033 List<Type> actuals = type.allparams();
1034 List<Type> args = type.getTypeArguments();
1035 List<Type> forms = type.tsym.type.getTypeArguments();
1036 ListBuffer<Type> bounds_buf = new ListBuffer<>();
1037
1038 // For matching pairs of actual argument types `a' and
1039 // formal type parameters with declared bound `b' ...
1040 while (args.nonEmpty() && forms.nonEmpty()) {
1041 // exact type arguments needs to know their
1042 // bounds (for upper and lower bound
1043 // calculations). So we create new bounds where
1044 // type-parameters are replaced with actuals argument types.
1045 bounds_buf.append(types.subst(forms.head.getUpperBound(), formals, actuals));
1046 args = args.tail;
1047 forms = forms.tail;
1048 }
1049
1050 args = type.getTypeArguments();
1051 List<Type> tvars_cap = types.substBounds(formals,
1052 formals,
1053 types.capture(type).allparams());
1054 while (args.nonEmpty() && tvars_cap.nonEmpty()) {
1055 // Let the actual arguments know their bound
1056 args.head.withTypeVar((TypeVar)tvars_cap.head);
1057 args = args.tail;
1058 tvars_cap = tvars_cap.tail;
1059 }
1060
1061 args = type.getTypeArguments();
1062 List<Type> bounds = bounds_buf.toList();
1063
1064 while (args.nonEmpty() && bounds.nonEmpty()) {
1065 Type actual = args.head;
1066 if (!isTypeArgErroneous(actual) &&
1067 !bounds.head.isErroneous() &&
1068 !checkExtends(actual, bounds.head)) {
1069 return args.head;
1070 }
1071 args = args.tail;
1072 bounds = bounds.tail;
1073 }
1074
1075 args = type.getTypeArguments();
1076 bounds = bounds_buf.toList();
1077
1078 for (Type arg : types.capture(type).getTypeArguments()) {
1079 if (arg.hasTag(TYPEVAR) &&
1080 arg.getUpperBound().isErroneous() &&
1081 !bounds.head.isErroneous() &&
1082 !isTypeArgErroneous(args.head)) {
1083 return args.head;
1084 }
1085 bounds = bounds.tail;
1086 args = args.tail;
1087 }
1088
1089 return null;
1090 }
1091 //where
1092 boolean isTypeArgErroneous(Type t) {
1093 return isTypeArgErroneous.visit(t);
1094 }
1095
1096 Types.UnaryVisitor<Boolean> isTypeArgErroneous = new Types.UnaryVisitor<Boolean>() {
1097 public Boolean visitType(Type t, Void s) {
1098 return t.isErroneous();
1099 }
1100 @Override
1101 public Boolean visitTypeVar(TypeVar t, Void s) {
1102 return visit(t.getUpperBound());
1103 }
1104 @Override
1105 public Boolean visitCapturedType(CapturedType t, Void s) {
1106 return visit(t.getUpperBound()) ||
1107 visit(t.getLowerBound());
1108 }
1109 @Override
1110 public Boolean visitWildcardType(WildcardType t, Void s) {
1111 return visit(t.type);
1112 }
1113 };
1114
1115 /** Check that given modifiers are legal for given symbol and
1116 * return modifiers together with any implicit modifiers for that symbol.
1117 * Warning: we can't use flags() here since this method
1118 * is called during class enter, when flags() would cause a premature
1119 * completion.
1120 * @param pos Position to be used for error reporting.
1121 * @param flags The set of modifiers given in a definition.
1122 * @param sym The defined symbol.
1123 */
1124 long checkFlags(DiagnosticPosition pos, long flags, Symbol sym, JCTree tree) {
1125 long mask;
1126 long implicit = 0;
1127
1128 switch (sym.kind) {
1129 case VAR:
1130 if (TreeInfo.isReceiverParam(tree))
1131 mask = ReceiverParamFlags;
1132 else if (sym.owner.kind != TYP)
1133 mask = LocalVarFlags;
1134 else if ((sym.owner.flags_field & INTERFACE) != 0)
1135 mask = implicit = InterfaceVarFlags;
1136 else
1137 mask = VarFlags;
1138 break;
1139 case MTH:
1140 if (sym.name == names.init) {
1141 if ((sym.owner.flags_field & ENUM) != 0) {
1142 // enum constructors cannot be declared public or
1143 // protected and must be implicitly or explicitly
1144 // private
1145 implicit = PRIVATE;
1146 mask = PRIVATE;
1147 } else
1148 mask = ConstructorFlags;
1149 } else if ((sym.owner.flags_field & INTERFACE) != 0) {
1150 if ((sym.owner.flags_field & ANNOTATION) != 0) {
1151 mask = AnnotationTypeElementMask;
1152 implicit = PUBLIC | ABSTRACT;
1153 } else if ((flags & (DEFAULT | STATIC | PRIVATE)) != 0) {
1154 mask = InterfaceMethodMask;
1155 implicit = (flags & PRIVATE) != 0 ? 0 : PUBLIC;
1156 if ((flags & DEFAULT) != 0) {
1157 implicit |= ABSTRACT;
1158 }
1159 } else {
1160 mask = implicit = InterfaceMethodFlags;
1161 }
1162 } else {
1163 mask = MethodFlags;
1164 }
1165 // Imply STRICTFP if owner has STRICTFP set.
1166 if (((flags|implicit) & Flags.ABSTRACT) == 0 ||
1167 ((flags) & Flags.DEFAULT) != 0)
1168 implicit |= sym.owner.flags_field & STRICTFP;
1169 break;
1170 case TYP:
1171 if (sym.isLocal()) {
1172 mask = LocalClassFlags;
1173 if ((sym.owner.flags_field & STATIC) == 0 &&
1174 (flags & ENUM) != 0)
1175 log.error(pos, Errors.EnumsMustBeStatic);
1176 } else if (sym.owner.kind == TYP) {
1177 mask = MemberClassFlags;
1178 if (sym.owner.owner.kind == PCK ||
1179 (sym.owner.flags_field & STATIC) != 0)
1180 mask |= STATIC;
1181 else if ((flags & ENUM) != 0)
1182 log.error(pos, Errors.EnumsMustBeStatic);
1183 // Nested interfaces and enums are always STATIC (Spec ???)
1184 if ((flags & (INTERFACE | ENUM)) != 0 ) implicit = STATIC;
1185 } else {
1186 mask = ClassFlags;
1187 }
1188 // Interfaces are always ABSTRACT
1189 if ((flags & INTERFACE) != 0) implicit |= ABSTRACT;
1190
1191 if ((flags & ENUM) != 0) {
1192 // enums can't be declared abstract or final
1193 mask &= ~(ABSTRACT | FINAL);
1194 implicit |= implicitEnumFinalFlag(tree);
1195 }
1196 // Imply STRICTFP if owner has STRICTFP set.
1197 implicit |= sym.owner.flags_field & STRICTFP;
1198 break;
1199 default:
1200 throw new AssertionError();
1201 }
1202 long illegal = flags & ExtendedStandardFlags & ~mask;
1203 if (illegal != 0) {
1204 if ((illegal & INTERFACE) != 0) {
1205 log.error(pos, ((flags & ANNOTATION) != 0) ? Errors.AnnotationDeclNotAllowedHere : Errors.IntfNotAllowedHere);
1206 mask |= INTERFACE;
1207 }
1208 else {
1209 log.error(pos,
1210 Errors.ModNotAllowedHere(asFlagSet(illegal)));
1211 }
1212 }
1213 else if ((sym.kind == TYP ||
1214 // ISSUE: Disallowing abstract&private is no longer appropriate
1215 // in the presence of inner classes. Should it be deleted here?
1216 checkDisjoint(pos, flags,
1217 ABSTRACT,
1218 PRIVATE | STATIC | DEFAULT))
1219 &&
1220 checkDisjoint(pos, flags,
1221 STATIC | PRIVATE,
1222 DEFAULT)
1223 &&
1224 checkDisjoint(pos, flags,
1225 ABSTRACT | INTERFACE,
1226 FINAL | NATIVE | SYNCHRONIZED)
1227 &&
1228 checkDisjoint(pos, flags,
1229 PUBLIC,
1230 PRIVATE | PROTECTED)
1231 &&
1232 checkDisjoint(pos, flags,
1233 PRIVATE,
1234 PUBLIC | PROTECTED)
1235 &&
1236 checkDisjoint(pos, flags,
1237 FINAL,
1238 VOLATILE)
1239 &&
1240 (sym.kind == TYP ||
1241 checkDisjoint(pos, flags,
1242 ABSTRACT | NATIVE,
1243 STRICTFP))) {
1244 // skip
1245 }
1246 return flags & (mask | ~ExtendedStandardFlags) | implicit;
1247 }
1248
1249
1250 /** Determine if this enum should be implicitly final.
1251 *
1252 * If the enum has no specialized enum contants, it is final.
1253 *
1254 * If the enum does have specialized enum contants, it is
1255 * <i>not</i> final.
1256 */
1257 private long implicitEnumFinalFlag(JCTree tree) {
1258 if (!tree.hasTag(CLASSDEF)) return 0;
1259 class SpecialTreeVisitor extends JCTree.Visitor {
1260 boolean specialized;
1261 SpecialTreeVisitor() {
1262 this.specialized = false;
1263 }
1264
1265 @Override
1266 public void visitTree(JCTree tree) { /* no-op */ }
1267
1268 @Override
1269 public void visitVarDef(JCVariableDecl tree) {
1270 if ((tree.mods.flags & ENUM) != 0) {
1271 if (tree.init instanceof JCNewClass &&
1272 ((JCNewClass) tree.init).def != null) {
1273 specialized = true;
1274 }
1275 }
1276 }
1277 }
1278
1279 SpecialTreeVisitor sts = new SpecialTreeVisitor();
1280 JCClassDecl cdef = (JCClassDecl) tree;
1281 for (JCTree defs: cdef.defs) {
1282 defs.accept(sts);
1283 if (sts.specialized) return 0;
1284 }
1285 return FINAL;
1286 }
1287
1288 /* *************************************************************************
1289 * Type Validation
1290 **************************************************************************/
1291
1292 /** Validate a type expression. That is,
1293 * check that all type arguments of a parametric type are within
1294 * their bounds. This must be done in a second phase after type attribution
1295 * since a class might have a subclass as type parameter bound. E.g:
1296 *
1297 * <pre>{@code
1298 * class B<A extends C> { ... }
1299 * class C extends B<C> { ... }
1300 * }</pre>
1301 *
1302 * and we can't make sure that the bound is already attributed because
1303 * of possible cycles.
1304 *
1305 * Visitor method: Validate a type expression, if it is not null, catching
1306 * and reporting any completion failures.
1307 */
1308 void validate(JCTree tree, Env<AttrContext> env) {
1309 validate(tree, env, true);
1310 }
1311 void validate(JCTree tree, Env<AttrContext> env, boolean checkRaw) {
1312 new Validator(env).validateTree(tree, checkRaw, true);
1313 }
1314
1315 /** Visitor method: Validate a list of type expressions.
1316 */
1317 void validate(List<? extends JCTree> trees, Env<AttrContext> env) {
1318 for (List<? extends JCTree> l = trees; l.nonEmpty(); l = l.tail)
1319 validate(l.head, env);
1320 }
1321
1322 /** A visitor class for type validation.
1323 */
1324 class Validator extends JCTree.Visitor {
1325
1326 boolean checkRaw;
1327 boolean isOuter;
1328 Env<AttrContext> env;
1329
1330 Validator(Env<AttrContext> env) {
1331 this.env = env;
1332 }
1333
1334 @Override
1335 public void visitTypeArray(JCArrayTypeTree tree) {
1336 validateTree(tree.elemtype, checkRaw, isOuter);
1337 }
1338
1339 @Override
1340 public void visitTypeApply(JCTypeApply tree) {
1341 if (tree.type.hasTag(CLASS)) {
1342 List<JCExpression> args = tree.arguments;
1343 List<Type> forms = tree.type.tsym.type.getTypeArguments();
1344
1345 Type incompatibleArg = firstIncompatibleTypeArg(tree.type);
1346 if (incompatibleArg != null) {
1347 for (JCTree arg : tree.arguments) {
1348 if (arg.type == incompatibleArg) {
1349 log.error(arg, Errors.NotWithinBounds(incompatibleArg, forms.head));
1350 }
1351 forms = forms.tail;
1352 }
1353 }
1354
1355 forms = tree.type.tsym.type.getTypeArguments();
1356
1357 boolean is_java_lang_Class = tree.type.tsym.flatName() == names.java_lang_Class;
1358
1359 // For matching pairs of actual argument types `a' and
1360 // formal type parameters with declared bound `b' ...
1361 while (args.nonEmpty() && forms.nonEmpty()) {
1362 validateTree(args.head,
1363 !(isOuter && is_java_lang_Class),
1364 false);
1365 args = args.tail;
1366 forms = forms.tail;
1367 }
1368
1369 // Check that this type is either fully parameterized, or
1370 // not parameterized at all.
1371 if (tree.type.getEnclosingType().isRaw())
1372 log.error(tree.pos(), Errors.ImproperlyFormedTypeInnerRawParam);
1373 if (tree.clazz.hasTag(SELECT))
1374 visitSelectInternal((JCFieldAccess)tree.clazz);
1375 }
1376 }
1377
1378 @Override
1379 public void visitTypeParameter(JCTypeParameter tree) {
1380 validateTrees(tree.bounds, true, isOuter);
1381 checkClassBounds(tree.pos(), tree.type);
1382 }
1383
1384 @Override
1385 public void visitWildcard(JCWildcard tree) {
1386 if (tree.inner != null)
1387 validateTree(tree.inner, true, isOuter);
1388 }
1389
1390 @Override
1391 public void visitSelect(JCFieldAccess tree) {
1392 if (tree.type.hasTag(CLASS)) {
1393 visitSelectInternal(tree);
1394
1395 // Check that this type is either fully parameterized, or
1396 // not parameterized at all.
1397 if (tree.selected.type.isParameterized() && tree.type.tsym.type.getTypeArguments().nonEmpty())
1398 log.error(tree.pos(), Errors.ImproperlyFormedTypeParamMissing);
1399 }
1400 }
1401
1402 public void visitSelectInternal(JCFieldAccess tree) {
1403 if (tree.type.tsym.isStatic() &&
1404 tree.selected.type.isParameterized()) {
1405 // The enclosing type is not a class, so we are
1406 // looking at a static member type. However, the
1407 // qualifying expression is parameterized.
1408 log.error(tree.pos(), Errors.CantSelectStaticClassFromParamType);
1409 } else {
1410 // otherwise validate the rest of the expression
1411 tree.selected.accept(this);
1412 }
1413 }
1414
1415 @Override
1416 public void visitAnnotatedType(JCAnnotatedType tree) {
1417 tree.underlyingType.accept(this);
1418 }
1419
1420 @Override
1421 public void visitTypeIdent(JCPrimitiveTypeTree that) {
1422 if (that.type.hasTag(TypeTag.VOID)) {
1423 log.error(that.pos(), Errors.VoidNotAllowedHere);
1424 }
1425 super.visitTypeIdent(that);
1426 }
1427
1428 /** Default visitor method: do nothing.
1429 */
1430 @Override
1431 public void visitTree(JCTree tree) {
1432 }
1433
1434 public void validateTree(JCTree tree, boolean checkRaw, boolean isOuter) {
1435 if (tree != null) {
1436 boolean prevCheckRaw = this.checkRaw;
1437 this.checkRaw = checkRaw;
1438 this.isOuter = isOuter;
1439
1440 try {
1441 tree.accept(this);
1442 if (checkRaw)
1443 checkRaw(tree, env);
1444 } catch (CompletionFailure ex) {
1445 completionError(tree.pos(), ex);
1446 } finally {
1447 this.checkRaw = prevCheckRaw;
1448 }
1449 }
1450 }
1451
1452 public void validateTrees(List<? extends JCTree> trees, boolean checkRaw, boolean isOuter) {
1453 for (List<? extends JCTree> l = trees; l.nonEmpty(); l = l.tail)
1454 validateTree(l.head, checkRaw, isOuter);
1455 }
1456 }
1457
1458 void checkRaw(JCTree tree, Env<AttrContext> env) {
1459 if (lint.isEnabled(LintCategory.RAW) &&
1460 tree.type.hasTag(CLASS) &&
1461 !TreeInfo.isDiamond(tree) &&
1462 !withinAnonConstr(env) &&
1463 tree.type.isRaw()) {
1464 log.warning(LintCategory.RAW,
1465 tree.pos(), Warnings.RawClassUse(tree.type, tree.type.tsym.type));
1466 }
1467 }
1468 //where
1469 private boolean withinAnonConstr(Env<AttrContext> env) {
1470 return env.enclClass.name.isEmpty() &&
1471 env.enclMethod != null && env.enclMethod.name == names.init;
1472 }
1473
1474 /* *************************************************************************
1475 * Exception checking
1476 **************************************************************************/
1477
1478 /* The following methods treat classes as sets that contain
1479 * the class itself and all their subclasses
1480 */
1481
1482 /** Is given type a subtype of some of the types in given list?
1483 */
1484 boolean subset(Type t, List<Type> ts) {
1485 for (List<Type> l = ts; l.nonEmpty(); l = l.tail)
1486 if (types.isSubtype(t, l.head)) return true;
1487 return false;
1488 }
1489
1490 /** Is given type a subtype or supertype of
1491 * some of the types in given list?
1492 */
1493 boolean intersects(Type t, List<Type> ts) {
1494 for (List<Type> l = ts; l.nonEmpty(); l = l.tail)
1495 if (types.isSubtype(t, l.head) || types.isSubtype(l.head, t)) return true;
1496 return false;
1497 }
1498
1499 /** Add type set to given type list, unless it is a subclass of some class
1500 * in the list.
1501 */
1502 List<Type> incl(Type t, List<Type> ts) {
1503 return subset(t, ts) ? ts : excl(t, ts).prepend(t);
1504 }
1505
1506 /** Remove type set from type set list.
1507 */
1508 List<Type> excl(Type t, List<Type> ts) {
1509 if (ts.isEmpty()) {
1510 return ts;
1511 } else {
1512 List<Type> ts1 = excl(t, ts.tail);
1513 if (types.isSubtype(ts.head, t)) return ts1;
1514 else if (ts1 == ts.tail) return ts;
1515 else return ts1.prepend(ts.head);
1516 }
1517 }
1518
1519 /** Form the union of two type set lists.
1520 */
1521 List<Type> union(List<Type> ts1, List<Type> ts2) {
1522 List<Type> ts = ts1;
1523 for (List<Type> l = ts2; l.nonEmpty(); l = l.tail)
1524 ts = incl(l.head, ts);
1525 return ts;
1526 }
1527
1528 /** Form the difference of two type lists.
1529 */
1530 List<Type> diff(List<Type> ts1, List<Type> ts2) {
1531 List<Type> ts = ts1;
1532 for (List<Type> l = ts2; l.nonEmpty(); l = l.tail)
1533 ts = excl(l.head, ts);
1534 return ts;
1535 }
1536
1537 /** Form the intersection of two type lists.
1538 */
1539 public List<Type> intersect(List<Type> ts1, List<Type> ts2) {
1540 List<Type> ts = List.nil();
1541 for (List<Type> l = ts1; l.nonEmpty(); l = l.tail)
1542 if (subset(l.head, ts2)) ts = incl(l.head, ts);
1543 for (List<Type> l = ts2; l.nonEmpty(); l = l.tail)
1544 if (subset(l.head, ts1)) ts = incl(l.head, ts);
1545 return ts;
1546 }
1547
1548 /** Is exc an exception symbol that need not be declared?
1549 */
1550 boolean isUnchecked(ClassSymbol exc) {
1551 return
1552 exc.kind == ERR ||
1553 exc.isSubClass(syms.errorType.tsym, types) ||
1554 exc.isSubClass(syms.runtimeExceptionType.tsym, types);
1555 }
1556
1557 /** Is exc an exception type that need not be declared?
1558 */
1559 boolean isUnchecked(Type exc) {
1560 return
1561 (exc.hasTag(TYPEVAR)) ? isUnchecked(types.supertype(exc)) :
1562 (exc.hasTag(CLASS)) ? isUnchecked((ClassSymbol)exc.tsym) :
1563 exc.hasTag(BOT);
1564 }
1565
1566 boolean isChecked(Type exc) {
1567 return !isUnchecked(exc);
1568 }
1569
1570 /** Same, but handling completion failures.
1571 */
1572 boolean isUnchecked(DiagnosticPosition pos, Type exc) {
1573 try {
1574 return isUnchecked(exc);
1575 } catch (CompletionFailure ex) {
1576 completionError(pos, ex);
1577 return true;
1578 }
1579 }
1580
1581 /** Is exc handled by given exception list?
1582 */
1583 boolean isHandled(Type exc, List<Type> handled) {
1584 return isUnchecked(exc) || subset(exc, handled);
1585 }
1586
1587 /** Return all exceptions in thrown list that are not in handled list.
1588 * @param thrown The list of thrown exceptions.
1589 * @param handled The list of handled exceptions.
1590 */
1591 List<Type> unhandled(List<Type> thrown, List<Type> handled) {
1592 List<Type> unhandled = List.nil();
1593 for (List<Type> l = thrown; l.nonEmpty(); l = l.tail)
1594 if (!isHandled(l.head, handled)) unhandled = unhandled.prepend(l.head);
1595 return unhandled;
1596 }
1597
1598 /* *************************************************************************
1599 * Overriding/Implementation checking
1600 **************************************************************************/
1601
1602 /** The level of access protection given by a flag set,
1603 * where PRIVATE is highest and PUBLIC is lowest.
1604 */
1605 static int protection(long flags) {
1606 switch ((short)(flags & AccessFlags)) {
1607 case PRIVATE: return 3;
1608 case PROTECTED: return 1;
1609 default:
1610 case PUBLIC: return 0;
1611 case 0: return 2;
1612 }
1613 }
1614
1615 /** A customized "cannot override" error message.
1616 * @param m The overriding method.
1617 * @param other The overridden method.
1618 * @return An internationalized string.
1619 */
1620 Fragment cannotOverride(MethodSymbol m, MethodSymbol other) {
1621 Symbol mloc = m.location();
1622 Symbol oloc = other.location();
1623
1624 if ((other.owner.flags() & INTERFACE) == 0)
1625 return Fragments.CantOverride(m, mloc, other, oloc);
1626 else if ((m.owner.flags() & INTERFACE) == 0)
1627 return Fragments.CantImplement(m, mloc, other, oloc);
1628 else
1629 return Fragments.ClashesWith(m, mloc, other, oloc);
1630 }
1631
1632 /** A customized "override" warning message.
1633 * @param m The overriding method.
1634 * @param other The overridden method.
1635 * @return An internationalized string.
1636 */
1637 Fragment uncheckedOverrides(MethodSymbol m, MethodSymbol other) {
1638 Symbol mloc = m.location();
1639 Symbol oloc = other.location();
1640
1641 if ((other.owner.flags() & INTERFACE) == 0)
1642 return Fragments.UncheckedOverride(m, mloc, other, oloc);
1643 else if ((m.owner.flags() & INTERFACE) == 0)
1644 return Fragments.UncheckedImplement(m, mloc, other, oloc);
1645 else
1646 return Fragments.UncheckedClashWith(m, mloc, other, oloc);
1647 }
1648
1649 /** A customized "override" warning message.
1650 * @param m The overriding method.
1651 * @param other The overridden method.
1652 * @return An internationalized string.
1653 */
1654 Fragment varargsOverrides(MethodSymbol m, MethodSymbol other) {
1655 Symbol mloc = m.location();
1656 Symbol oloc = other.location();
1657
1658 if ((other.owner.flags() & INTERFACE) == 0)
1659 return Fragments.VarargsOverride(m, mloc, other, oloc);
1660 else if ((m.owner.flags() & INTERFACE) == 0)
1661 return Fragments.VarargsImplement(m, mloc, other, oloc);
1662 else
1663 return Fragments.VarargsClashWith(m, mloc, other, oloc);
1664 }
1665
1666 /** Check that this method conforms with overridden method 'other'.
1667 * where `origin' is the class where checking started.
1668 * Complications:
1669 * (1) Do not check overriding of synthetic methods
1670 * (reason: they might be final).
1671 * todo: check whether this is still necessary.
1672 * (2) Admit the case where an interface proxy throws fewer exceptions
1673 * than the method it implements. Augment the proxy methods with the
1674 * undeclared exceptions in this case.
1675 * (3) When generics are enabled, admit the case where an interface proxy
1676 * has a result type
1677 * extended by the result type of the method it implements.
1678 * Change the proxies result type to the smaller type in this case.
1679 *
1680 * @param tree The tree from which positions
1681 * are extracted for errors.
1682 * @param m The overriding method.
1683 * @param other The overridden method.
1684 * @param origin The class of which the overriding method
1685 * is a member.
1686 */
1687 void checkOverride(JCTree tree,
1688 MethodSymbol m,
1689 MethodSymbol other,
1690 ClassSymbol origin) {
1691 // Don't check overriding of synthetic methods or by bridge methods.
1692 if ((m.flags() & (SYNTHETIC|BRIDGE)) != 0 || (other.flags() & SYNTHETIC) != 0) {
1693 return;
1694 }
1695
1696 // Error if static method overrides instance method (JLS 8.4.6.2).
1697 if ((m.flags() & STATIC) != 0 &&
1698 (other.flags() & STATIC) == 0) {
1699 log.error(TreeInfo.diagnosticPositionFor(m, tree),
1700 Errors.OverrideStatic(cannotOverride(m, other)));
1701 m.flags_field |= BAD_OVERRIDE;
1702 return;
1703 }
1704
1705 // Error if instance method overrides static or final
1706 // method (JLS 8.4.6.1).
1707 if ((other.flags() & FINAL) != 0 ||
1708 (m.flags() & STATIC) == 0 &&
1709 (other.flags() & STATIC) != 0) {
1710 log.error(TreeInfo.diagnosticPositionFor(m, tree),
1711 Errors.OverrideMeth(cannotOverride(m, other),
1712 asFlagSet(other.flags() & (FINAL | STATIC))));
1713 m.flags_field |= BAD_OVERRIDE;
1714 return;
1715 }
1716
1717 if ((m.owner.flags() & ANNOTATION) != 0) {
1718 // handled in validateAnnotationMethod
1719 return;
1720 }
1721
1722 // Error if overriding method has weaker access (JLS 8.4.6.3).
1723 if (protection(m.flags()) > protection(other.flags())) {
1724 log.error(TreeInfo.diagnosticPositionFor(m, tree),
1725 (other.flags() & AccessFlags) == 0 ?
1726 Errors.OverrideWeakerAccess(cannotOverride(m, other),
1727 "package") :
1728 Errors.OverrideWeakerAccess(cannotOverride(m, other),
1729 asFlagSet(other.flags() & AccessFlags)));
1730 m.flags_field |= BAD_OVERRIDE;
1731 return;
1732 }
1733
1734 Type mt = types.memberType(origin.type, m);
1735 Type ot = types.memberType(origin.type, other);
1736 // Error if overriding result type is different
1737 // (or, in the case of generics mode, not a subtype) of
1738 // overridden result type. We have to rename any type parameters
1739 // before comparing types.
1740 List<Type> mtvars = mt.getTypeArguments();
1741 List<Type> otvars = ot.getTypeArguments();
1742 Type mtres = mt.getReturnType();
1743 Type otres = types.subst(ot.getReturnType(), otvars, mtvars);
1744
1745 overrideWarner.clear();
1746 boolean resultTypesOK =
1747 types.returnTypeSubstitutable(mt, ot, otres, overrideWarner);
1748 if (!resultTypesOK) {
1749 if ((m.flags() & STATIC) != 0 && (other.flags() & STATIC) != 0) {
1750 log.error(TreeInfo.diagnosticPositionFor(m, tree),
1751 Errors.OverrideIncompatibleRet(Fragments.CantHide(m, m.location(), other,
1752 other.location()), mtres, otres));
1753 m.flags_field |= BAD_OVERRIDE;
1754 } else {
1755 log.error(TreeInfo.diagnosticPositionFor(m, tree),
1756 Errors.OverrideIncompatibleRet(cannotOverride(m, other), mtres, otres));
1757 m.flags_field |= BAD_OVERRIDE;
1758 }
1759 return;
1760 } else if (overrideWarner.hasNonSilentLint(LintCategory.UNCHECKED)) {
1761 warnUnchecked(TreeInfo.diagnosticPositionFor(m, tree),
1762 Warnings.OverrideUncheckedRet(uncheckedOverrides(m, other), mtres, otres));
1763 }
1764
1765 // Error if overriding method throws an exception not reported
1766 // by overridden method.
1767 List<Type> otthrown = types.subst(ot.getThrownTypes(), otvars, mtvars);
1768 List<Type> unhandledErased = unhandled(mt.getThrownTypes(), types.erasure(otthrown));
1769 List<Type> unhandledUnerased = unhandled(mt.getThrownTypes(), otthrown);
1770 if (unhandledErased.nonEmpty()) {
1771 log.error(TreeInfo.diagnosticPositionFor(m, tree),
1772 Errors.OverrideMethDoesntThrow(cannotOverride(m, other), unhandledUnerased.head));
1773 m.flags_field |= BAD_OVERRIDE;
1774 return;
1775 }
1776 else if (unhandledUnerased.nonEmpty()) {
1777 warnUnchecked(TreeInfo.diagnosticPositionFor(m, tree),
1778 Warnings.OverrideUncheckedThrown(cannotOverride(m, other), unhandledUnerased.head));
1779 return;
1780 }
1781
1782 // Optional warning if varargs don't agree
1783 if ((((m.flags() ^ other.flags()) & Flags.VARARGS) != 0)
1784 && lint.isEnabled(LintCategory.OVERRIDES)) {
1785 log.warning(TreeInfo.diagnosticPositionFor(m, tree),
1786 ((m.flags() & Flags.VARARGS) != 0)
1787 ? Warnings.OverrideVarargsMissing(varargsOverrides(m, other))
1788 : Warnings.OverrideVarargsExtra(varargsOverrides(m, other)));
1789 }
1790
1791 // Warn if instance method overrides bridge method (compiler spec ??)
1792 if ((other.flags() & BRIDGE) != 0) {
1793 log.warning(TreeInfo.diagnosticPositionFor(m, tree),
1794 Warnings.OverrideBridge(uncheckedOverrides(m, other)));
1795 }
1796
1797 // Warn if a deprecated method overridden by a non-deprecated one.
1798 if (!isDeprecatedOverrideIgnorable(other, origin)) {
1799 Lint prevLint = setLint(lint.augment(m));
1800 try {
1801 checkDeprecated(() -> TreeInfo.diagnosticPositionFor(m, tree), m, other);
1802 } finally {
1803 setLint(prevLint);
1804 }
1805 }
1806 }
1807 // where
1808 private boolean isDeprecatedOverrideIgnorable(MethodSymbol m, ClassSymbol origin) {
1809 // If the method, m, is defined in an interface, then ignore the issue if the method
1810 // is only inherited via a supertype and also implemented in the supertype,
1811 // because in that case, we will rediscover the issue when examining the method
1812 // in the supertype.
1813 // If the method, m, is not defined in an interface, then the only time we need to
1814 // address the issue is when the method is the supertype implemementation: any other
1815 // case, we will have dealt with when examining the supertype classes
1816 ClassSymbol mc = m.enclClass();
1817 Type st = types.supertype(origin.type);
1818 if (!st.hasTag(CLASS))
1819 return true;
1820 MethodSymbol stimpl = m.implementation((ClassSymbol)st.tsym, types, false);
1821
1822 if (mc != null && ((mc.flags() & INTERFACE) != 0)) {
1823 List<Type> intfs = types.interfaces(origin.type);
1824 return (intfs.contains(mc.type) ? false : (stimpl != null));
1825 }
1826 else
1827 return (stimpl != m);
1828 }
1829
1830
1831 // used to check if there were any unchecked conversions
1832 Warner overrideWarner = new Warner();
1833
1834 /** Check that a class does not inherit two concrete methods
1835 * with the same signature.
1836 * @param pos Position to be used for error reporting.
1837 * @param site The class type to be checked.
1838 */
1839 public void checkCompatibleConcretes(DiagnosticPosition pos, Type site) {
1840 Type sup = types.supertype(site);
1841 if (!sup.hasTag(CLASS)) return;
1842
1843 for (Type t1 = sup;
1844 t1.hasTag(CLASS) && t1.tsym.type.isParameterized();
1845 t1 = types.supertype(t1)) {
1846 for (Symbol s1 : t1.tsym.members().getSymbols(NON_RECURSIVE)) {
1847 if (s1.kind != MTH ||
1848 (s1.flags() & (STATIC|SYNTHETIC|BRIDGE)) != 0 ||
1849 !s1.isInheritedIn(site.tsym, types) ||
1850 ((MethodSymbol)s1).implementation(site.tsym,
1851 types,
1852 true) != s1)
1853 continue;
1854 Type st1 = types.memberType(t1, s1);
1855 int s1ArgsLength = st1.getParameterTypes().length();
1856 if (st1 == s1.type) continue;
1857
1858 for (Type t2 = sup;
1859 t2.hasTag(CLASS);
1860 t2 = types.supertype(t2)) {
1861 for (Symbol s2 : t2.tsym.members().getSymbolsByName(s1.name)) {
1862 if (s2 == s1 ||
1863 s2.kind != MTH ||
1864 (s2.flags() & (STATIC|SYNTHETIC|BRIDGE)) != 0 ||
1865 s2.type.getParameterTypes().length() != s1ArgsLength ||
1866 !s2.isInheritedIn(site.tsym, types) ||
1867 ((MethodSymbol)s2).implementation(site.tsym,
1868 types,
1869 true) != s2)
1870 continue;
1871 Type st2 = types.memberType(t2, s2);
1872 if (types.overrideEquivalent(st1, st2))
1873 log.error(pos,
1874 Errors.ConcreteInheritanceConflict(s1, t1, s2, t2, sup));
1875 }
1876 }
1877 }
1878 }
1879 }
1880
1881 /** Check that classes (or interfaces) do not each define an abstract
1882 * method with same name and arguments but incompatible return types.
1883 * @param pos Position to be used for error reporting.
1884 * @param t1 The first argument type.
1885 * @param t2 The second argument type.
1886 */
1887 public boolean checkCompatibleAbstracts(DiagnosticPosition pos,
1888 Type t1,
1889 Type t2,
1890 Type site) {
1891 if ((site.tsym.flags() & COMPOUND) != 0) {
1892 // special case for intersections: need to eliminate wildcards in supertypes
1893 t1 = types.capture(t1);
1894 t2 = types.capture(t2);
1895 }
1896 return firstIncompatibility(pos, t1, t2, site) == null;
1897 }
1898
1899 /** Return the first method which is defined with same args
1900 * but different return types in two given interfaces, or null if none
1901 * exists.
1902 * @param t1 The first type.
1903 * @param t2 The second type.
1904 * @param site The most derived type.
1905 * @returns symbol from t2 that conflicts with one in t1.
1906 */
1907 private Symbol firstIncompatibility(DiagnosticPosition pos, Type t1, Type t2, Type site) {
1908 Map<TypeSymbol,Type> interfaces1 = new HashMap<>();
1909 closure(t1, interfaces1);
1910 Map<TypeSymbol,Type> interfaces2;
1911 if (t1 == t2)
1912 interfaces2 = interfaces1;
1913 else
1914 closure(t2, interfaces1, interfaces2 = new HashMap<>());
1915
1916 for (Type t3 : interfaces1.values()) {
1917 for (Type t4 : interfaces2.values()) {
1918 Symbol s = firstDirectIncompatibility(pos, t3, t4, site);
1919 if (s != null) return s;
1920 }
1921 }
1922 return null;
1923 }
1924
1925 /** Compute all the supertypes of t, indexed by type symbol. */
1926 private void closure(Type t, Map<TypeSymbol,Type> typeMap) {
1927 if (!t.hasTag(CLASS)) return;
1928 if (typeMap.put(t.tsym, t) == null) {
1929 closure(types.supertype(t), typeMap);
1930 for (Type i : types.interfaces(t))
1931 closure(i, typeMap);
1932 }
1933 }
1934
1935 /** Compute all the supertypes of t, indexed by type symbol (except thise in typesSkip). */
1936 private void closure(Type t, Map<TypeSymbol,Type> typesSkip, Map<TypeSymbol,Type> typeMap) {
1937 if (!t.hasTag(CLASS)) return;
1938 if (typesSkip.get(t.tsym) != null) return;
1939 if (typeMap.put(t.tsym, t) == null) {
1940 closure(types.supertype(t), typesSkip, typeMap);
1941 for (Type i : types.interfaces(t))
1942 closure(i, typesSkip, typeMap);
1943 }
1944 }
1945
1946 /** Return the first method in t2 that conflicts with a method from t1. */
1947 private Symbol firstDirectIncompatibility(DiagnosticPosition pos, Type t1, Type t2, Type site) {
1948 for (Symbol s1 : t1.tsym.members().getSymbols(NON_RECURSIVE)) {
1949 Type st1 = null;
1950 if (s1.kind != MTH || !s1.isInheritedIn(site.tsym, types) ||
1951 (s1.flags() & SYNTHETIC) != 0) continue;
1952 Symbol impl = ((MethodSymbol)s1).implementation(site.tsym, types, false);
1953 if (impl != null && (impl.flags() & ABSTRACT) == 0) continue;
1954 for (Symbol s2 : t2.tsym.members().getSymbolsByName(s1.name)) {
1955 if (s1 == s2) continue;
1956 if (s2.kind != MTH || !s2.isInheritedIn(site.tsym, types) ||
1957 (s2.flags() & SYNTHETIC) != 0) continue;
1958 if (st1 == null) st1 = types.memberType(t1, s1);
1959 Type st2 = types.memberType(t2, s2);
1960 if (types.overrideEquivalent(st1, st2)) {
1961 List<Type> tvars1 = st1.getTypeArguments();
1962 List<Type> tvars2 = st2.getTypeArguments();
1963 Type rt1 = st1.getReturnType();
1964 Type rt2 = types.subst(st2.getReturnType(), tvars2, tvars1);
1965 boolean compat =
1966 types.isSameType(rt1, rt2) ||
1967 !rt1.isPrimitiveOrVoid() &&
1968 !rt2.isPrimitiveOrVoid() &&
1969 (types.covariantReturnType(rt1, rt2, types.noWarnings) ||
1970 types.covariantReturnType(rt2, rt1, types.noWarnings)) ||
1971 checkCommonOverriderIn(s1,s2,site);
1972 if (!compat) {
1973 log.error(pos, Errors.TypesIncompatible(t1, t2,
1974 Fragments.IncompatibleDiffRet(s2.name, types.memberType(t2, s2).getParameterTypes())));
1975 return s2;
1976 }
1977 } else if (checkNameClash((ClassSymbol)site.tsym, s1, s2) &&
1978 !checkCommonOverriderIn(s1, s2, site)) {
1979 log.error(pos, Errors.NameClashSameErasureNoOverride(
1980 s1.name, types.memberType(site, s1).asMethodType().getParameterTypes(), s1.location(),
1981 s2.name, types.memberType(site, s2).asMethodType().getParameterTypes(), s2.location()));
1982 return s2;
1983 }
1984 }
1985 }
1986 return null;
1987 }
1988 //WHERE
1989 boolean checkCommonOverriderIn(Symbol s1, Symbol s2, Type site) {
1990 Map<TypeSymbol,Type> supertypes = new HashMap<>();
1991 Type st1 = types.memberType(site, s1);
1992 Type st2 = types.memberType(site, s2);
1993 closure(site, supertypes);
1994 for (Type t : supertypes.values()) {
1995 for (Symbol s3 : t.tsym.members().getSymbolsByName(s1.name)) {
1996 if (s3 == s1 || s3 == s2 || s3.kind != MTH || (s3.flags() & (BRIDGE|SYNTHETIC)) != 0) continue;
1997 Type st3 = types.memberType(site,s3);
1998 if (types.overrideEquivalent(st3, st1) &&
1999 types.overrideEquivalent(st3, st2) &&
2000 types.returnTypeSubstitutable(st3, st1) &&
2001 types.returnTypeSubstitutable(st3, st2)) {
2002 return true;
2003 }
2004 }
2005 }
2006 return false;
2007 }
2008
2009 /** Check that a given method conforms with any method it overrides.
2010 * @param tree The tree from which positions are extracted
2011 * for errors.
2012 * @param m The overriding method.
2013 */
2014 void checkOverride(Env<AttrContext> env, JCMethodDecl tree, MethodSymbol m) {
2015 ClassSymbol origin = (ClassSymbol)m.owner;
2016 if ((origin.flags() & ENUM) != 0 && names.finalize.equals(m.name))
2017 if (m.overrides(syms.enumFinalFinalize, origin, types, false)) {
2018 log.error(tree.pos(), Errors.EnumNoFinalize);
2019 return;
2020 }
2021 for (Type t = origin.type; t.hasTag(CLASS);
2022 t = types.supertype(t)) {
2023 if (t != origin.type) {
2024 checkOverride(tree, t, origin, m);
2025 }
2026 for (Type t2 : types.interfaces(t)) {
2027 checkOverride(tree, t2, origin, m);
2028 }
2029 }
2030
2031 final boolean explicitOverride = m.attribute(syms.overrideType.tsym) != null;
2032 // Check if this method must override a super method due to being annotated with @Override
2033 // or by virtue of being a member of a diamond inferred anonymous class. Latter case is to
2034 // be treated "as if as they were annotated" with @Override.
2035 boolean mustOverride = explicitOverride ||
2036 (env.info.isAnonymousDiamond && !m.isConstructor() && !m.isPrivate());
2037 if (mustOverride && !isOverrider(m)) {
2038 DiagnosticPosition pos = tree.pos();
2039 for (JCAnnotation a : tree.getModifiers().annotations) {
2040 if (a.annotationType.type.tsym == syms.overrideType.tsym) {
2041 pos = a.pos();
2042 break;
2043 }
2044 }
2045 log.error(pos,
2046 explicitOverride ? (m.isStatic() ? Errors.StaticMethodsCannotBeAnnotatedWithOverride : Errors.MethodDoesNotOverrideSuperclass) :
2047 Errors.AnonymousDiamondMethodDoesNotOverrideSuperclass(Fragments.DiamondAnonymousMethodsImplicitlyOverride));
2048 }
2049 }
2050
2051 void checkOverride(JCTree tree, Type site, ClassSymbol origin, MethodSymbol m) {
2052 TypeSymbol c = site.tsym;
2053 for (Symbol sym : c.members().getSymbolsByName(m.name)) {
2054 if (m.overrides(sym, origin, types, false)) {
2055 if ((sym.flags() & ABSTRACT) == 0) {
2056 checkOverride(tree, m, (MethodSymbol)sym, origin);
2057 }
2058 }
2059 }
2060 }
2061
2062 private Filter<Symbol> equalsHasCodeFilter = s -> MethodSymbol.implementation_filter.accepts(s) &&
2063 (s.flags() & BAD_OVERRIDE) == 0;
2064
2065 public void checkClassOverrideEqualsAndHashIfNeeded(DiagnosticPosition pos,
2066 ClassSymbol someClass) {
2067 /* At present, annotations cannot possibly have a method that is override
2068 * equivalent with Object.equals(Object) but in any case the condition is
2069 * fine for completeness.
2070 */
2071 if (someClass == (ClassSymbol)syms.objectType.tsym ||
2072 someClass.isInterface() || someClass.isEnum() ||
2073 (someClass.flags() & ANNOTATION) != 0 ||
2074 (someClass.flags() & ABSTRACT) != 0) return;
2075 //anonymous inner classes implementing interfaces need especial treatment
2076 if (someClass.isAnonymous()) {
2077 List<Type> interfaces = types.interfaces(someClass.type);
2078 if (interfaces != null && !interfaces.isEmpty() &&
2079 interfaces.head.tsym == syms.comparatorType.tsym) return;
2080 }
2081 checkClassOverrideEqualsAndHash(pos, someClass);
2082 }
2083
2084 private void checkClassOverrideEqualsAndHash(DiagnosticPosition pos,
2085 ClassSymbol someClass) {
2086 if (lint.isEnabled(LintCategory.OVERRIDES)) {
2087 MethodSymbol equalsAtObject = (MethodSymbol)syms.objectType
2088 .tsym.members().findFirst(names.equals);
2089 MethodSymbol hashCodeAtObject = (MethodSymbol)syms.objectType
2090 .tsym.members().findFirst(names.hashCode);
2091 boolean overridesEquals = types.implementation(equalsAtObject,
2092 someClass, false, equalsHasCodeFilter).owner == someClass;
2093 boolean overridesHashCode = types.implementation(hashCodeAtObject,
2094 someClass, false, equalsHasCodeFilter) != hashCodeAtObject;
2095
2096 if (overridesEquals && !overridesHashCode) {
2097 log.warning(LintCategory.OVERRIDES, pos,
2098 Warnings.OverrideEqualsButNotHashcode(someClass));
2099 }
2100 }
2101 }
2102
2103 public void checkModuleName (JCModuleDecl tree) {
2104 Name moduleName = tree.sym.name;
2105 Assert.checkNonNull(moduleName);
2106 if (lint.isEnabled(LintCategory.MODULE)) {
2107 JCExpression qualId = tree.qualId;
2108 while (qualId != null) {
2109 Name componentName;
2110 DiagnosticPosition pos;
2111 switch (qualId.getTag()) {
2112 case SELECT:
2113 JCFieldAccess selectNode = ((JCFieldAccess) qualId);
2114 componentName = selectNode.name;
2115 pos = selectNode.pos();
2116 qualId = selectNode.selected;
2117 break;
2118 case IDENT:
2119 componentName = ((JCIdent) qualId).name;
2120 pos = qualId.pos();
2121 qualId = null;
2122 break;
2123 default:
2124 throw new AssertionError("Unexpected qualified identifier: " + qualId.toString());
2125 }
2126 if (componentName != null) {
2127 String moduleNameComponentString = componentName.toString();
2128 int nameLength = moduleNameComponentString.length();
2129 if (nameLength > 0 && Character.isDigit(moduleNameComponentString.charAt(nameLength - 1))) {
2130 log.warning(Lint.LintCategory.MODULE, pos, Warnings.PoorChoiceForModuleName(componentName));
2131 }
2132 }
2133 }
2134 }
2135 }
2136
2137 private boolean checkNameClash(ClassSymbol origin, Symbol s1, Symbol s2) {
2138 ClashFilter cf = new ClashFilter(origin.type);
2139 return (cf.accepts(s1) &&
2140 cf.accepts(s2) &&
2141 types.hasSameArgs(s1.erasure(types), s2.erasure(types)));
2142 }
2143
2144
2145 /** Check that all abstract members of given class have definitions.
2146 * @param pos Position to be used for error reporting.
2147 * @param c The class.
2148 */
2149 void checkAllDefined(DiagnosticPosition pos, ClassSymbol c) {
2150 MethodSymbol undef = types.firstUnimplementedAbstract(c);
2151 if (undef != null) {
2152 MethodSymbol undef1 =
2153 new MethodSymbol(undef.flags(), undef.name,
2154 types.memberType(c.type, undef), undef.owner);
2155 log.error(pos,
2156 Errors.DoesNotOverrideAbstract(c, undef1, undef1.location()));
2157 }
2158 }
2159
2160 void checkNonCyclicDecl(JCClassDecl tree) {
2161 CycleChecker cc = new CycleChecker();
2162 cc.scan(tree);
2163 if (!cc.errorFound && !cc.partialCheck) {
2164 tree.sym.flags_field |= ACYCLIC;
2165 }
2166 }
2167
2168 class CycleChecker extends TreeScanner {
2169
2170 List<Symbol> seenClasses = List.nil();
2171 boolean errorFound = false;
2172 boolean partialCheck = false;
2173
2174 private void checkSymbol(DiagnosticPosition pos, Symbol sym) {
2175 if (sym != null && sym.kind == TYP) {
2176 Env<AttrContext> classEnv = enter.getEnv((TypeSymbol)sym);
2177 if (classEnv != null) {
2178 DiagnosticSource prevSource = log.currentSource();
2179 try {
2180 log.useSource(classEnv.toplevel.sourcefile);
2181 scan(classEnv.tree);
2182 }
2183 finally {
2184 log.useSource(prevSource.getFile());
2185 }
2186 } else if (sym.kind == TYP) {
2187 checkClass(pos, sym, List.nil());
2188 }
2189 } else {
2190 //not completed yet
2191 partialCheck = true;
2192 }
2193 }
2194
2195 @Override
2196 public void visitSelect(JCFieldAccess tree) {
2197 super.visitSelect(tree);
2198 checkSymbol(tree.pos(), tree.sym);
2199 }
2200
2201 @Override
2202 public void visitIdent(JCIdent tree) {
2203 checkSymbol(tree.pos(), tree.sym);
2204 }
2205
2206 @Override
2207 public void visitTypeApply(JCTypeApply tree) {
2208 scan(tree.clazz);
2209 }
2210
2211 @Override
2212 public void visitTypeArray(JCArrayTypeTree tree) {
2213 scan(tree.elemtype);
2214 }
2215
2216 @Override
2217 public void visitClassDef(JCClassDecl tree) {
2218 List<JCTree> supertypes = List.nil();
2219 if (tree.getExtendsClause() != null) {
2220 supertypes = supertypes.prepend(tree.getExtendsClause());
2221 }
2222 if (tree.getImplementsClause() != null) {
2223 for (JCTree intf : tree.getImplementsClause()) {
2224 supertypes = supertypes.prepend(intf);
2225 }
2226 }
2227 checkClass(tree.pos(), tree.sym, supertypes);
2228 }
2229
2230 void checkClass(DiagnosticPosition pos, Symbol c, List<JCTree> supertypes) {
2231 if ((c.flags_field & ACYCLIC) != 0)
2232 return;
2233 if (seenClasses.contains(c)) {
2234 errorFound = true;
2235 noteCyclic(pos, (ClassSymbol)c);
2236 } else if (!c.type.isErroneous()) {
2237 try {
2238 seenClasses = seenClasses.prepend(c);
2239 if (c.type.hasTag(CLASS)) {
2240 if (supertypes.nonEmpty()) {
2241 scan(supertypes);
2242 }
2243 else {
2244 ClassType ct = (ClassType)c.type;
2245 if (ct.supertype_field == null ||
2246 ct.interfaces_field == null) {
2247 //not completed yet
2248 partialCheck = true;
2249 return;
2250 }
2251 checkSymbol(pos, ct.supertype_field.tsym);
2252 for (Type intf : ct.interfaces_field) {
2253 checkSymbol(pos, intf.tsym);
2254 }
2255 }
2256 if (c.owner.kind == TYP) {
2257 checkSymbol(pos, c.owner);
2258 }
2259 }
2260 } finally {
2261 seenClasses = seenClasses.tail;
2262 }
2263 }
2264 }
2265 }
2266
2267 /** Check for cyclic references. Issue an error if the
2268 * symbol of the type referred to has a LOCKED flag set.
2269 *
2270 * @param pos Position to be used for error reporting.
2271 * @param t The type referred to.
2272 */
2273 void checkNonCyclic(DiagnosticPosition pos, Type t) {
2274 checkNonCyclicInternal(pos, t);
2275 }
2276
2277
2278 void checkNonCyclic(DiagnosticPosition pos, TypeVar t) {
2279 checkNonCyclic1(pos, t, List.nil());
2280 }
2281
2282 private void checkNonCyclic1(DiagnosticPosition pos, Type t, List<TypeVar> seen) {
2283 final TypeVar tv;
2284 if (t.hasTag(TYPEVAR) && (t.tsym.flags() & UNATTRIBUTED) != 0)
2285 return;
2286 if (seen.contains(t)) {
2287 tv = (TypeVar)t;
2288 tv.setUpperBound(types.createErrorType(t));
2289 log.error(pos, Errors.CyclicInheritance(t));
2290 } else if (t.hasTag(TYPEVAR)) {
2291 tv = (TypeVar)t;
2292 seen = seen.prepend(tv);
2293 for (Type b : types.getBounds(tv))
2294 checkNonCyclic1(pos, b, seen);
2295 }
2296 }
2297
2298 /** Check for cyclic references. Issue an error if the
2299 * symbol of the type referred to has a LOCKED flag set.
2300 *
2301 * @param pos Position to be used for error reporting.
2302 * @param t The type referred to.
2303 * @returns True if the check completed on all attributed classes
2304 */
2305 private boolean checkNonCyclicInternal(DiagnosticPosition pos, Type t) {
2306 boolean complete = true; // was the check complete?
2307 //- System.err.println("checkNonCyclicInternal("+t+");");//DEBUG
2308 Symbol c = t.tsym;
2309 if ((c.flags_field & ACYCLIC) != 0) return true;
2310
2311 if ((c.flags_field & LOCKED) != 0) {
2312 noteCyclic(pos, (ClassSymbol)c);
2313 } else if (!c.type.isErroneous()) {
2314 try {
2315 c.flags_field |= LOCKED;
2316 if (c.type.hasTag(CLASS)) {
2317 ClassType clazz = (ClassType)c.type;
2318 if (clazz.interfaces_field != null)
2319 for (List<Type> l=clazz.interfaces_field; l.nonEmpty(); l=l.tail)
2320 complete &= checkNonCyclicInternal(pos, l.head);
2321 if (clazz.supertype_field != null) {
2322 Type st = clazz.supertype_field;
2323 if (st != null && st.hasTag(CLASS))
2324 complete &= checkNonCyclicInternal(pos, st);
2325 }
2326 if (c.owner.kind == TYP)
2327 complete &= checkNonCyclicInternal(pos, c.owner.type);
2328 }
2329 } finally {
2330 c.flags_field &= ~LOCKED;
2331 }
2332 }
2333 if (complete)
2334 complete = ((c.flags_field & UNATTRIBUTED) == 0) && c.isCompleted();
2335 if (complete) c.flags_field |= ACYCLIC;
2336 return complete;
2337 }
2338
2339 /** Note that we found an inheritance cycle. */
2340 private void noteCyclic(DiagnosticPosition pos, ClassSymbol c) {
2341 log.error(pos, Errors.CyclicInheritance(c));
2342 for (List<Type> l=types.interfaces(c.type); l.nonEmpty(); l=l.tail)
2343 l.head = types.createErrorType((ClassSymbol)l.head.tsym, Type.noType);
2344 Type st = types.supertype(c.type);
2345 if (st.hasTag(CLASS))
2346 ((ClassType)c.type).supertype_field = types.createErrorType((ClassSymbol)st.tsym, Type.noType);
2347 c.type = types.createErrorType(c, c.type);
2348 c.flags_field |= ACYCLIC;
2349 }
2350
2351 /** Check that all methods which implement some
2352 * method conform to the method they implement.
2353 * @param tree The class definition whose members are checked.
2354 */
2355 void checkImplementations(JCClassDecl tree) {
2356 checkImplementations(tree, tree.sym, tree.sym);
2357 }
2358 //where
2359 /** Check that all methods which implement some
2360 * method in `ic' conform to the method they implement.
2361 */
2362 void checkImplementations(JCTree tree, ClassSymbol origin, ClassSymbol ic) {
2363 for (List<Type> l = types.closure(ic.type); l.nonEmpty(); l = l.tail) {
2364 ClassSymbol lc = (ClassSymbol)l.head.tsym;
2365 if ((lc.flags() & ABSTRACT) != 0) {
2366 for (Symbol sym : lc.members().getSymbols(NON_RECURSIVE)) {
2367 if (sym.kind == MTH &&
2368 (sym.flags() & (STATIC|ABSTRACT)) == ABSTRACT) {
2369 MethodSymbol absmeth = (MethodSymbol)sym;
2370 MethodSymbol implmeth = absmeth.implementation(origin, types, false);
2371 if (implmeth != null && implmeth != absmeth &&
2372 (implmeth.owner.flags() & INTERFACE) ==
2373 (origin.flags() & INTERFACE)) {
2374 // don't check if implmeth is in a class, yet
2375 // origin is an interface. This case arises only
2376 // if implmeth is declared in Object. The reason is
2377 // that interfaces really don't inherit from
2378 // Object it's just that the compiler represents
2379 // things that way.
2380 checkOverride(tree, implmeth, absmeth, origin);
2381 }
2382 }
2383 }
2384 }
2385 }
2386 }
2387
2388 /** Check that all abstract methods implemented by a class are
2389 * mutually compatible.
2390 * @param pos Position to be used for error reporting.
2391 * @param c The class whose interfaces are checked.
2392 */
2393 void checkCompatibleSupertypes(DiagnosticPosition pos, Type c) {
2394 List<Type> supertypes = types.interfaces(c);
2395 Type supertype = types.supertype(c);
2396 if (supertype.hasTag(CLASS) &&
2397 (supertype.tsym.flags() & ABSTRACT) != 0)
2398 supertypes = supertypes.prepend(supertype);
2399 for (List<Type> l = supertypes; l.nonEmpty(); l = l.tail) {
2400 if (!l.head.getTypeArguments().isEmpty() &&
2401 !checkCompatibleAbstracts(pos, l.head, l.head, c))
2402 return;
2403 for (List<Type> m = supertypes; m != l; m = m.tail)
2404 if (!checkCompatibleAbstracts(pos, l.head, m.head, c))
2405 return;
2406 }
2407 checkCompatibleConcretes(pos, c);
2408 }
2409
2410 /** Check that all non-override equivalent methods accessible from 'site'
2411 * are mutually compatible (JLS 8.4.8/9.4.1).
2412 *
2413 * @param pos Position to be used for error reporting.
2414 * @param site The class whose methods are checked.
2415 * @param sym The method symbol to be checked.
2416 */
2417 void checkOverrideClashes(DiagnosticPosition pos, Type site, MethodSymbol sym) {
2418 ClashFilter cf = new ClashFilter(site);
2419 //for each method m1 that is overridden (directly or indirectly)
2420 //by method 'sym' in 'site'...
2421
2422 List<MethodSymbol> potentiallyAmbiguousList = List.nil();
2423 boolean overridesAny = false;
2424 ArrayList<Symbol> symbolsByName = new ArrayList<>();
2425 types.membersClosure(site, false).getSymbolsByName(sym.name, cf).forEach(symbolsByName::add);
2426 for (Symbol m1 : symbolsByName) {
2427 if (!sym.overrides(m1, site.tsym, types, false)) {
2428 if (m1 == sym) {
2429 continue;
2430 }
2431
2432 if (!overridesAny) {
2433 potentiallyAmbiguousList = potentiallyAmbiguousList.prepend((MethodSymbol)m1);
2434 }
2435 continue;
2436 }
2437
2438 if (m1 != sym) {
2439 overridesAny = true;
2440 potentiallyAmbiguousList = List.nil();
2441 }
2442
2443 //...check each method m2 that is a member of 'site'
2444 for (Symbol m2 : symbolsByName) {
2445 if (m2 == m1) continue;
2446 //if (i) the signature of 'sym' is not a subsignature of m1 (seen as
2447 //a member of 'site') and (ii) m1 has the same erasure as m2, issue an error
2448 if (!types.isSubSignature(sym.type, types.memberType(site, m2), Feature.STRICT_METHOD_CLASH_CHECK.allowedInSource(source)) &&
2449 types.hasSameArgs(m2.erasure(types), m1.erasure(types))) {
2450 sym.flags_field |= CLASH;
2451 if (m1 == sym) {
2452 log.error(pos, Errors.NameClashSameErasureNoOverride(
2453 m1.name, types.memberType(site, m1).asMethodType().getParameterTypes(), m1.location(),
2454 m2.name, types.memberType(site, m2).asMethodType().getParameterTypes(), m2.location()));
2455 } else {
2456 ClassType ct = (ClassType)site;
2457 String kind = ct.isInterface() ? "interface" : "class";
2458 log.error(pos, Errors.NameClashSameErasureNoOverride1(
2459 kind,
2460 ct.tsym.name,
2461 m1.name,
2462 types.memberType(site, m1).asMethodType().getParameterTypes(),
2463 m1.location(),
2464 m2.name,
2465 types.memberType(site, m2).asMethodType().getParameterTypes(),
2466 m2.location()));
2467 }
2468 return;
2469 }
2470 }
2471 }
2472
2473 if (!overridesAny) {
2474 for (MethodSymbol m: potentiallyAmbiguousList) {
2475 checkPotentiallyAmbiguousOverloads(pos, site, sym, m);
2476 }
2477 }
2478 }
2479
2480 /** Check that all static methods accessible from 'site' are
2481 * mutually compatible (JLS 8.4.8).
2482 *
2483 * @param pos Position to be used for error reporting.
2484 * @param site The class whose methods are checked.
2485 * @param sym The method symbol to be checked.
2486 */
2487 void checkHideClashes(DiagnosticPosition pos, Type site, MethodSymbol sym) {
2488 ClashFilter cf = new ClashFilter(site);
2489 //for each method m1 that is a member of 'site'...
2490 for (Symbol s : types.membersClosure(site, true).getSymbolsByName(sym.name, cf)) {
2491 //if (i) the signature of 'sym' is not a subsignature of m1 (seen as
2492 //a member of 'site') and (ii) 'sym' has the same erasure as m1, issue an error
2493 if (!types.isSubSignature(sym.type, types.memberType(site, s), Feature.STRICT_METHOD_CLASH_CHECK.allowedInSource(source))) {
2494 if (types.hasSameArgs(s.erasure(types), sym.erasure(types))) {
2495 log.error(pos,
2496 Errors.NameClashSameErasureNoHide(sym, sym.location(), s, s.location()));
2497 return;
2498 } else {
2499 checkPotentiallyAmbiguousOverloads(pos, site, sym, (MethodSymbol)s);
2500 }
2501 }
2502 }
2503 }
2504
2505 //where
2506 private class ClashFilter implements Filter<Symbol> {
2507
2508 Type site;
2509
2510 ClashFilter(Type site) {
2511 this.site = site;
2512 }
2513
2514 boolean shouldSkip(Symbol s) {
2515 return (s.flags() & CLASH) != 0 &&
2516 s.owner == site.tsym;
2517 }
2518
2519 public boolean accepts(Symbol s) {
2520 return s.kind == MTH &&
2521 (s.flags() & SYNTHETIC) == 0 &&
2522 !shouldSkip(s) &&
2523 s.isInheritedIn(site.tsym, types) &&
2524 !s.isConstructor();
2525 }
2526 }
2527
2528 void checkDefaultMethodClashes(DiagnosticPosition pos, Type site) {
2529 DefaultMethodClashFilter dcf = new DefaultMethodClashFilter(site);
2530 for (Symbol m : types.membersClosure(site, false).getSymbols(dcf)) {
2531 Assert.check(m.kind == MTH);
2532 List<MethodSymbol> prov = types.interfaceCandidates(site, (MethodSymbol)m);
2533 if (prov.size() > 1) {
2534 ListBuffer<Symbol> abstracts = new ListBuffer<>();
2535 ListBuffer<Symbol> defaults = new ListBuffer<>();
2536 for (MethodSymbol provSym : prov) {
2537 if ((provSym.flags() & DEFAULT) != 0) {
2538 defaults = defaults.append(provSym);
2539 } else if ((provSym.flags() & ABSTRACT) != 0) {
2540 abstracts = abstracts.append(provSym);
2541 }
2542 if (defaults.nonEmpty() && defaults.size() + abstracts.size() >= 2) {
2543 //strong semantics - issue an error if two sibling interfaces
2544 //have two override-equivalent defaults - or if one is abstract
2545 //and the other is default
2546 Fragment diagKey;
2547 Symbol s1 = defaults.first();
2548 Symbol s2;
2549 if (defaults.size() > 1) {
2550 s2 = defaults.toList().tail.head;
2551 diagKey = Fragments.IncompatibleUnrelatedDefaults(Kinds.kindName(site.tsym), site,
2552 m.name, types.memberType(site, m).getParameterTypes(),
2553 s1.location(), s2.location());
2554
2555 } else {
2556 s2 = abstracts.first();
2557 diagKey = Fragments.IncompatibleAbstractDefault(Kinds.kindName(site.tsym), site,
2558 m.name, types.memberType(site, m).getParameterTypes(),
2559 s1.location(), s2.location());
2560 }
2561 log.error(pos, Errors.TypesIncompatible(s1.location().type, s2.location().type, diagKey));
2562 break;
2563 }
2564 }
2565 }
2566 }
2567 }
2568
2569 //where
2570 private class DefaultMethodClashFilter implements Filter<Symbol> {
2571
2572 Type site;
2573
2574 DefaultMethodClashFilter(Type site) {
2575 this.site = site;
2576 }
2577
2578 public boolean accepts(Symbol s) {
2579 return s.kind == MTH &&
2580 (s.flags() & DEFAULT) != 0 &&
2581 s.isInheritedIn(site.tsym, types) &&
2582 !s.isConstructor();
2583 }
2584 }
2585
2586 /**
2587 * Report warnings for potentially ambiguous method declarations. Two declarations
2588 * are potentially ambiguous if they feature two unrelated functional interface
2589 * in same argument position (in which case, a call site passing an implicit
2590 * lambda would be ambiguous).
2591 */
2592 void checkPotentiallyAmbiguousOverloads(DiagnosticPosition pos, Type site,
2593 MethodSymbol msym1, MethodSymbol msym2) {
2594 if (msym1 != msym2 &&
2595 Feature.DEFAULT_METHODS.allowedInSource(source) &&
2596 lint.isEnabled(LintCategory.OVERLOADS) &&
2597 (msym1.flags() & POTENTIALLY_AMBIGUOUS) == 0 &&
2598 (msym2.flags() & POTENTIALLY_AMBIGUOUS) == 0) {
2599 Type mt1 = types.memberType(site, msym1);
2600 Type mt2 = types.memberType(site, msym2);
2601 //if both generic methods, adjust type variables
2602 if (mt1.hasTag(FORALL) && mt2.hasTag(FORALL) &&
2603 types.hasSameBounds((ForAll)mt1, (ForAll)mt2)) {
2604 mt2 = types.subst(mt2, ((ForAll)mt2).tvars, ((ForAll)mt1).tvars);
2605 }
2606 //expand varargs methods if needed
2607 int maxLength = Math.max(mt1.getParameterTypes().length(), mt2.getParameterTypes().length());
2608 List<Type> args1 = rs.adjustArgs(mt1.getParameterTypes(), msym1, maxLength, true);
2609 List<Type> args2 = rs.adjustArgs(mt2.getParameterTypes(), msym2, maxLength, true);
2610 //if arities don't match, exit
2611 if (args1.length() != args2.length()) return;
2612 boolean potentiallyAmbiguous = false;
2613 while (args1.nonEmpty() && args2.nonEmpty()) {
2614 Type s = args1.head;
2615 Type t = args2.head;
2616 if (!types.isSubtype(t, s) && !types.isSubtype(s, t)) {
2617 if (types.isFunctionalInterface(s) && types.isFunctionalInterface(t) &&
2618 types.findDescriptorType(s).getParameterTypes().length() > 0 &&
2619 types.findDescriptorType(s).getParameterTypes().length() ==
2620 types.findDescriptorType(t).getParameterTypes().length()) {
2621 potentiallyAmbiguous = true;
2622 } else {
2623 break;
2624 }
2625 }
2626 args1 = args1.tail;
2627 args2 = args2.tail;
2628 }
2629 if (potentiallyAmbiguous) {
2630 //we found two incompatible functional interfaces with same arity
2631 //this means a call site passing an implicit lambda would be ambigiuous
2632 msym1.flags_field |= POTENTIALLY_AMBIGUOUS;
2633 msym2.flags_field |= POTENTIALLY_AMBIGUOUS;
2634 log.warning(LintCategory.OVERLOADS, pos,
2635 Warnings.PotentiallyAmbiguousOverload(msym1, msym1.location(),
2636 msym2, msym2.location()));
2637 return;
2638 }
2639 }
2640 }
2641
2642 void checkAccessFromSerializableElement(final JCTree tree, boolean isLambda) {
2643 if (warnOnAnyAccessToMembers ||
2644 (lint.isEnabled(LintCategory.SERIAL) &&
2645 !lint.isSuppressed(LintCategory.SERIAL) &&
2646 isLambda)) {
2647 Symbol sym = TreeInfo.symbol(tree);
2648 if (!sym.kind.matches(KindSelector.VAL_MTH)) {
2649 return;
2650 }
2651
2652 if (sym.kind == VAR) {
2653 if ((sym.flags() & PARAMETER) != 0 ||
2654 sym.isLocal() ||
2655 sym.name == names._this ||
2656 sym.name == names._super) {
2657 return;
2658 }
2659 }
2660
2661 if (!types.isSubtype(sym.owner.type, syms.serializableType) &&
2662 isEffectivelyNonPublic(sym)) {
2663 if (isLambda) {
2664 if (belongsToRestrictedPackage(sym)) {
2665 log.warning(LintCategory.SERIAL, tree.pos(),
2666 Warnings.AccessToMemberFromSerializableLambda(sym));
2667 }
2668 } else {
2669 log.warning(tree.pos(),
2670 Warnings.AccessToMemberFromSerializableElement(sym));
2671 }
2672 }
2673 }
2674 }
2675
2676 private boolean isEffectivelyNonPublic(Symbol sym) {
2677 if (sym.packge() == syms.rootPackage) {
2678 return false;
2679 }
2680
2681 while (sym.kind != PCK) {
2682 if ((sym.flags() & PUBLIC) == 0) {
2683 return true;
2684 }
2685 sym = sym.owner;
2686 }
2687 return false;
2688 }
2689
2690 private boolean belongsToRestrictedPackage(Symbol sym) {
2691 String fullName = sym.packge().fullname.toString();
2692 return fullName.startsWith("java.") ||
2693 fullName.startsWith("javax.") ||
2694 fullName.startsWith("sun.") ||
2695 fullName.contains(".internal.");
2696 }
2697
2698 /** Check that class c does not implement directly or indirectly
2699 * the same parameterized interface with two different argument lists.
2700 * @param pos Position to be used for error reporting.
2701 * @param type The type whose interfaces are checked.
2702 */
2703 void checkClassBounds(DiagnosticPosition pos, Type type) {
2704 checkClassBounds(pos, new HashMap<TypeSymbol,Type>(), type);
2705 }
2706 //where
2707 /** Enter all interfaces of type `type' into the hash table `seensofar'
2708 * with their class symbol as key and their type as value. Make
2709 * sure no class is entered with two different types.
2710 */
2711 void checkClassBounds(DiagnosticPosition pos,
2712 Map<TypeSymbol,Type> seensofar,
2713 Type type) {
2714 if (type.isErroneous()) return;
2715 for (List<Type> l = types.interfaces(type); l.nonEmpty(); l = l.tail) {
2716 Type it = l.head;
2717 if (type.hasTag(CLASS) && !it.hasTag(CLASS)) continue; // JLS 8.1.5
2718
2719 Type oldit = seensofar.put(it.tsym, it);
2720 if (oldit != null) {
2721 List<Type> oldparams = oldit.allparams();
2722 List<Type> newparams = it.allparams();
2723 if (!types.containsTypeEquivalent(oldparams, newparams))
2724 log.error(pos,
2725 Errors.CantInheritDiffArg(it.tsym,
2726 Type.toString(oldparams),
2727 Type.toString(newparams)));
2728 }
2729 checkClassBounds(pos, seensofar, it);
2730 }
2731 Type st = types.supertype(type);
2732 if (type.hasTag(CLASS) && !st.hasTag(CLASS)) return; // JLS 8.1.4
2733 if (st != Type.noType) checkClassBounds(pos, seensofar, st);
2734 }
2735
2736 /** Enter interface into into set.
2737 * If it existed already, issue a "repeated interface" error.
2738 */
2739 void checkNotRepeated(DiagnosticPosition pos, Type it, Set<Type> its) {
2740 if (its.contains(it))
2741 log.error(pos, Errors.RepeatedInterface);
2742 else {
2743 its.add(it);
2744 }
2745 }
2746
2747 /* *************************************************************************
2748 * Check annotations
2749 **************************************************************************/
2750
2751 /**
2752 * Recursively validate annotations values
2753 */
2754 void validateAnnotationTree(JCTree tree) {
2755 class AnnotationValidator extends TreeScanner {
2756 @Override
2757 public void visitAnnotation(JCAnnotation tree) {
2758 if (!tree.type.isErroneous() && tree.type.tsym.isAnnotationType()) {
2759 super.visitAnnotation(tree);
2760 validateAnnotation(tree);
2761 }
2762 }
2763 }
2764 tree.accept(new AnnotationValidator());
2765 }
2766
2767 /**
2768 * {@literal
2769 * Annotation types are restricted to primitives, String, an
2770 * enum, an annotation, Class, Class<?>, Class<? extends
2771 * Anything>, arrays of the preceding.
2772 * }
2773 */
2774 void validateAnnotationType(JCTree restype) {
2775 // restype may be null if an error occurred, so don't bother validating it
2776 if (restype != null) {
2777 validateAnnotationType(restype.pos(), restype.type);
2778 }
2779 }
2780
2781 void validateAnnotationType(DiagnosticPosition pos, Type type) {
2782 if (type.isPrimitive()) return;
2783 if (types.isSameType(type, syms.stringType)) return;
2784 if ((type.tsym.flags() & Flags.ENUM) != 0) return;
2785 if ((type.tsym.flags() & Flags.ANNOTATION) != 0) return;
2786 if (types.cvarLowerBound(type).tsym == syms.classType.tsym) return;
2787 if (types.isArray(type) && !types.isArray(types.elemtype(type))) {
2788 validateAnnotationType(pos, types.elemtype(type));
2789 return;
2790 }
2791 log.error(pos, Errors.InvalidAnnotationMemberType);
2792 }
2793
2794 /**
2795 * "It is also a compile-time error if any method declared in an
2796 * annotation type has a signature that is override-equivalent to
2797 * that of any public or protected method declared in class Object
2798 * or in the interface annotation.Annotation."
2799 *
2800 * @jls 9.6 Annotation Types
2801 */
2802 void validateAnnotationMethod(DiagnosticPosition pos, MethodSymbol m) {
2803 for (Type sup = syms.annotationType; sup.hasTag(CLASS); sup = types.supertype(sup)) {
2804 Scope s = sup.tsym.members();
2805 for (Symbol sym : s.getSymbolsByName(m.name)) {
2806 if (sym.kind == MTH &&
2807 (sym.flags() & (PUBLIC | PROTECTED)) != 0 &&
2808 types.overrideEquivalent(m.type, sym.type))
2809 log.error(pos, Errors.IntfAnnotationMemberClash(sym, sup));
2810 }
2811 }
2812 }
2813
2814 /** Check the annotations of a symbol.
2815 */
2816 public void validateAnnotations(List<JCAnnotation> annotations, Symbol s) {
2817 for (JCAnnotation a : annotations)
2818 validateAnnotation(a, s);
2819 }
2820
2821 /** Check the type annotations.
2822 */
2823 public void validateTypeAnnotations(List<JCAnnotation> annotations, boolean isTypeParameter) {
2824 for (JCAnnotation a : annotations)
2825 validateTypeAnnotation(a, isTypeParameter);
2826 }
2827
2828 /** Check an annotation of a symbol.
2829 */
2830 private void validateAnnotation(JCAnnotation a, Symbol s) {
2831 validateAnnotationTree(a);
2832
2833 if (a.type.tsym.isAnnotationType() && !annotationApplicable(a, s))
2834 log.error(a.pos(), Errors.AnnotationTypeNotApplicable);
2835
2836 if (a.annotationType.type.tsym == syms.functionalInterfaceType.tsym) {
2837 if (s.kind != TYP) {
2838 log.error(a.pos(), Errors.BadFunctionalIntfAnno);
2839 } else if (!s.isInterface() || (s.flags() & ANNOTATION) != 0) {
2840 log.error(a.pos(), Errors.BadFunctionalIntfAnno1(Fragments.NotAFunctionalIntf(s)));
2841 }
2842 }
2843 }
2844
2845 public void validateTypeAnnotation(JCAnnotation a, boolean isTypeParameter) {
2846 Assert.checkNonNull(a.type);
2847 validateAnnotationTree(a);
2848
2849 if (a.hasTag(TYPE_ANNOTATION) &&
2850 !a.annotationType.type.isErroneous() &&
2851 !isTypeAnnotation(a, isTypeParameter)) {
2852 log.error(a.pos(), Errors.AnnotationTypeNotApplicableToType(a.type));
2853 }
2854 }
2855
2856 /**
2857 * Validate the proposed container 'repeatable' on the
2858 * annotation type symbol 's'. Report errors at position
2859 * 'pos'.
2860 *
2861 * @param s The (annotation)type declaration annotated with a @Repeatable
2862 * @param repeatable the @Repeatable on 's'
2863 * @param pos where to report errors
2864 */
2865 public void validateRepeatable(TypeSymbol s, Attribute.Compound repeatable, DiagnosticPosition pos) {
2866 Assert.check(types.isSameType(repeatable.type, syms.repeatableType));
2867
2868 Type t = null;
2869 List<Pair<MethodSymbol,Attribute>> l = repeatable.values;
2870 if (!l.isEmpty()) {
2871 Assert.check(l.head.fst.name == names.value);
2872 t = ((Attribute.Class)l.head.snd).getValue();
2873 }
2874
2875 if (t == null) {
2876 // errors should already have been reported during Annotate
2877 return;
2878 }
2879
2880 validateValue(t.tsym, s, pos);
2881 validateRetention(t.tsym, s, pos);
2882 validateDocumented(t.tsym, s, pos);
2883 validateInherited(t.tsym, s, pos);
2884 validateTarget(t.tsym, s, pos);
2885 validateDefault(t.tsym, pos);
2886 }
2887
2888 private void validateValue(TypeSymbol container, TypeSymbol contained, DiagnosticPosition pos) {
2889 Symbol sym = container.members().findFirst(names.value);
2890 if (sym != null && sym.kind == MTH) {
2891 MethodSymbol m = (MethodSymbol) sym;
2892 Type ret = m.getReturnType();
2893 if (!(ret.hasTag(ARRAY) && types.isSameType(((ArrayType)ret).elemtype, contained.type))) {
2894 log.error(pos,
2895 Errors.InvalidRepeatableAnnotationValueReturn(container,
2896 ret,
2897 types.makeArrayType(contained.type)));
2898 }
2899 } else {
2900 log.error(pos, Errors.InvalidRepeatableAnnotationNoValue(container));
2901 }
2902 }
2903
2904 private void validateRetention(TypeSymbol container, TypeSymbol contained, DiagnosticPosition pos) {
2905 Attribute.RetentionPolicy containerRetention = types.getRetention(container);
2906 Attribute.RetentionPolicy containedRetention = types.getRetention(contained);
2907
2908 boolean error = false;
2909 switch (containedRetention) {
2910 case RUNTIME:
2911 if (containerRetention != Attribute.RetentionPolicy.RUNTIME) {
2912 error = true;
2913 }
2914 break;
2915 case CLASS:
2916 if (containerRetention == Attribute.RetentionPolicy.SOURCE) {
2917 error = true;
2918 }
2919 }
2920 if (error ) {
2921 log.error(pos,
2922 Errors.InvalidRepeatableAnnotationRetention(container,
2923 containerRetention.name(),
2924 contained,
2925 containedRetention.name()));
2926 }
2927 }
2928
2929 private void validateDocumented(Symbol container, Symbol contained, DiagnosticPosition pos) {
2930 if (contained.attribute(syms.documentedType.tsym) != null) {
2931 if (container.attribute(syms.documentedType.tsym) == null) {
2932 log.error(pos, Errors.InvalidRepeatableAnnotationNotDocumented(container, contained));
2933 }
2934 }
2935 }
2936
2937 private void validateInherited(Symbol container, Symbol contained, DiagnosticPosition pos) {
2938 if (contained.attribute(syms.inheritedType.tsym) != null) {
2939 if (container.attribute(syms.inheritedType.tsym) == null) {
2940 log.error(pos, Errors.InvalidRepeatableAnnotationNotInherited(container, contained));
2941 }
2942 }
2943 }
2944
2945 private void validateTarget(TypeSymbol container, TypeSymbol contained, DiagnosticPosition pos) {
2946 // The set of targets the container is applicable to must be a subset
2947 // (with respect to annotation target semantics) of the set of targets
2948 // the contained is applicable to. The target sets may be implicit or
2949 // explicit.
2950
2951 Set<Name> containerTargets;
2952 Attribute.Array containerTarget = getAttributeTargetAttribute(container);
2953 if (containerTarget == null) {
2954 containerTargets = getDefaultTargetSet();
2955 } else {
2956 containerTargets = new HashSet<>();
2957 for (Attribute app : containerTarget.values) {
2958 if (!(app instanceof Attribute.Enum)) {
2959 continue; // recovery
2960 }
2961 Attribute.Enum e = (Attribute.Enum)app;
2962 containerTargets.add(e.value.name);
2963 }
2964 }
2965
2966 Set<Name> containedTargets;
2967 Attribute.Array containedTarget = getAttributeTargetAttribute(contained);
2968 if (containedTarget == null) {
2969 containedTargets = getDefaultTargetSet();
2970 } else {
2971 containedTargets = new HashSet<>();
2972 for (Attribute app : containedTarget.values) {
2973 if (!(app instanceof Attribute.Enum)) {
2974 continue; // recovery
2975 }
2976 Attribute.Enum e = (Attribute.Enum)app;
2977 containedTargets.add(e.value.name);
2978 }
2979 }
2980
2981 if (!isTargetSubsetOf(containerTargets, containedTargets)) {
2982 log.error(pos, Errors.InvalidRepeatableAnnotationIncompatibleTarget(container, contained));
2983 }
2984 }
2985
2986 /* get a set of names for the default target */
2987 private Set<Name> getDefaultTargetSet() {
2988 if (defaultTargets == null) {
2989 Set<Name> targets = new HashSet<>();
2990 targets.add(names.ANNOTATION_TYPE);
2991 targets.add(names.CONSTRUCTOR);
2992 targets.add(names.FIELD);
2993 targets.add(names.LOCAL_VARIABLE);
2994 targets.add(names.METHOD);
2995 targets.add(names.PACKAGE);
2996 targets.add(names.PARAMETER);
2997 targets.add(names.TYPE);
2998
2999 defaultTargets = java.util.Collections.unmodifiableSet(targets);
3000 }
3001
3002 return defaultTargets;
3003 }
3004 private Set<Name> defaultTargets;
3005
3006
3007 /** Checks that s is a subset of t, with respect to ElementType
3008 * semantics, specifically {ANNOTATION_TYPE} is a subset of {TYPE},
3009 * and {TYPE_USE} covers the set {ANNOTATION_TYPE, TYPE, TYPE_USE,
3010 * TYPE_PARAMETER}.
3011 */
3012 private boolean isTargetSubsetOf(Set<Name> s, Set<Name> t) {
3013 // Check that all elements in s are present in t
3014 for (Name n2 : s) {
3015 boolean currentElementOk = false;
3016 for (Name n1 : t) {
3017 if (n1 == n2) {
3018 currentElementOk = true;
3019 break;
3020 } else if (n1 == names.TYPE && n2 == names.ANNOTATION_TYPE) {
3021 currentElementOk = true;
3022 break;
3023 } else if (n1 == names.TYPE_USE &&
3024 (n2 == names.TYPE ||
3025 n2 == names.ANNOTATION_TYPE ||
3026 n2 == names.TYPE_PARAMETER)) {
3027 currentElementOk = true;
3028 break;
3029 }
3030 }
3031 if (!currentElementOk)
3032 return false;
3033 }
3034 return true;
3035 }
3036
3037 private void validateDefault(Symbol container, DiagnosticPosition pos) {
3038 // validate that all other elements of containing type has defaults
3039 Scope scope = container.members();
3040 for(Symbol elm : scope.getSymbols()) {
3041 if (elm.name != names.value &&
3042 elm.kind == MTH &&
3043 ((MethodSymbol)elm).defaultValue == null) {
3044 log.error(pos,
3045 Errors.InvalidRepeatableAnnotationElemNondefault(container, elm));
3046 }
3047 }
3048 }
3049
3050 /** Is s a method symbol that overrides a method in a superclass? */
3051 boolean isOverrider(Symbol s) {
3052 if (s.kind != MTH || s.isStatic())
3053 return false;
3054 MethodSymbol m = (MethodSymbol)s;
3055 TypeSymbol owner = (TypeSymbol)m.owner;
3056 for (Type sup : types.closure(owner.type)) {
3057 if (sup == owner.type)
3058 continue; // skip "this"
3059 Scope scope = sup.tsym.members();
3060 for (Symbol sym : scope.getSymbolsByName(m.name)) {
3061 if (!sym.isStatic() && m.overrides(sym, owner, types, true))
3062 return true;
3063 }
3064 }
3065 return false;
3066 }
3067
3068 /** Is the annotation applicable to types? */
3069 protected boolean isTypeAnnotation(JCAnnotation a, boolean isTypeParameter) {
3070 List<Attribute> targets = typeAnnotations.annotationTargets(a.annotationType.type.tsym);
3071 return (targets == null) ?
3072 false :
3073 targets.stream()
3074 .anyMatch(attr -> isTypeAnnotation(attr, isTypeParameter));
3075 }
3076 //where
3077 boolean isTypeAnnotation(Attribute a, boolean isTypeParameter) {
3078 Attribute.Enum e = (Attribute.Enum)a;
3079 return (e.value.name == names.TYPE_USE ||
3080 (isTypeParameter && e.value.name == names.TYPE_PARAMETER));
3081 }
3082
3083 /** Is the annotation applicable to the symbol? */
3084 boolean annotationApplicable(JCAnnotation a, Symbol s) {
3085 Attribute.Array arr = getAttributeTargetAttribute(a.annotationType.type.tsym);
3086 Name[] targets;
3087
3088 if (arr == null) {
3089 targets = defaultTargetMetaInfo(a, s);
3090 } else {
3091 // TODO: can we optimize this?
3092 targets = new Name[arr.values.length];
3093 for (int i=0; i<arr.values.length; ++i) {
3094 Attribute app = arr.values[i];
3095 if (!(app instanceof Attribute.Enum)) {
3096 return true; // recovery
3097 }
3098 Attribute.Enum e = (Attribute.Enum) app;
3099 targets[i] = e.value.name;
3100 }
3101 }
3102 for (Name target : targets) {
3103 if (target == names.TYPE) {
3104 if (s.kind == TYP)
3105 return true;
3106 } else if (target == names.FIELD) {
3107 if (s.kind == VAR && s.owner.kind != MTH)
3108 return true;
3109 } else if (target == names.METHOD) {
3110 if (s.kind == MTH && !s.isConstructor())
3111 return true;
3112 } else if (target == names.PARAMETER) {
3113 if (s.kind == VAR && s.owner.kind == MTH &&
3114 (s.flags() & PARAMETER) != 0) {
3115 return true;
3116 }
3117 } else if (target == names.CONSTRUCTOR) {
3118 if (s.kind == MTH && s.isConstructor())
3119 return true;
3120 } else if (target == names.LOCAL_VARIABLE) {
3121 if (s.kind == VAR && s.owner.kind == MTH &&
3122 (s.flags() & PARAMETER) == 0) {
3123 return true;
3124 }
3125 } else if (target == names.ANNOTATION_TYPE) {
3126 if (s.kind == TYP && (s.flags() & ANNOTATION) != 0) {
3127 return true;
3128 }
3129 } else if (target == names.PACKAGE) {
3130 if (s.kind == PCK)
3131 return true;
3132 } else if (target == names.TYPE_USE) {
3133 if (s.kind == VAR && s.owner.kind == MTH && s.type.hasTag(NONE)) {
3134 //cannot type annotate implictly typed locals
3135 return false;
3136 } else if (s.kind == TYP || s.kind == VAR ||
3137 (s.kind == MTH && !s.isConstructor() &&
3138 !s.type.getReturnType().hasTag(VOID)) ||
3139 (s.kind == MTH && s.isConstructor())) {
3140 return true;
3141 }
3142 } else if (target == names.TYPE_PARAMETER) {
3143 if (s.kind == TYP && s.type.hasTag(TYPEVAR))
3144 return true;
3145 } else
3146 return true; // Unknown ElementType. This should be an error at declaration site,
3147 // assume applicable.
3148 }
3149 return false;
3150 }
3151
3152
3153 Attribute.Array getAttributeTargetAttribute(TypeSymbol s) {
3154 Attribute.Compound atTarget = s.getAnnotationTypeMetadata().getTarget();
3155 if (atTarget == null) return null; // ok, is applicable
3156 Attribute atValue = atTarget.member(names.value);
3157 if (!(atValue instanceof Attribute.Array)) return null; // error recovery
3158 return (Attribute.Array) atValue;
3159 }
3160
3161 private final Name[] dfltTargetMeta;
3162 private Name[] defaultTargetMetaInfo(JCAnnotation a, Symbol s) {
3163 return dfltTargetMeta;
3164 }
3165
3166 /** Check an annotation value.
3167 *
3168 * @param a The annotation tree to check
3169 * @return true if this annotation tree is valid, otherwise false
3170 */
3171 public boolean validateAnnotationDeferErrors(JCAnnotation a) {
3172 boolean res = false;
3173 final Log.DiagnosticHandler diagHandler = new Log.DiscardDiagnosticHandler(log);
3174 try {
3175 res = validateAnnotation(a);
3176 } finally {
3177 log.popDiagnosticHandler(diagHandler);
3178 }
3179 return res;
3180 }
3181
3182 private boolean validateAnnotation(JCAnnotation a) {
3183 boolean isValid = true;
3184 AnnotationTypeMetadata metadata = a.annotationType.type.tsym.getAnnotationTypeMetadata();
3185
3186 // collect an inventory of the annotation elements
3187 Set<MethodSymbol> elements = metadata.getAnnotationElements();
3188
3189 // remove the ones that are assigned values
3190 for (JCTree arg : a.args) {
3191 if (!arg.hasTag(ASSIGN)) continue; // recovery
3192 JCAssign assign = (JCAssign)arg;
3193 Symbol m = TreeInfo.symbol(assign.lhs);
3194 if (m == null || m.type.isErroneous()) continue;
3195 if (!elements.remove(m)) {
3196 isValid = false;
3197 log.error(assign.lhs.pos(),
3198 Errors.DuplicateAnnotationMemberValue(m.name, a.type));
3199 }
3200 }
3201
3202 // all the remaining ones better have default values
3203 List<Name> missingDefaults = List.nil();
3204 Set<MethodSymbol> membersWithDefault = metadata.getAnnotationElementsWithDefault();
3205 for (MethodSymbol m : elements) {
3206 if (m.type.isErroneous())
3207 continue;
3208
3209 if (!membersWithDefault.contains(m))
3210 missingDefaults = missingDefaults.append(m.name);
3211 }
3212 missingDefaults = missingDefaults.reverse();
3213 if (missingDefaults.nonEmpty()) {
3214 isValid = false;
3215 Error errorKey = (missingDefaults.size() > 1)
3216 ? Errors.AnnotationMissingDefaultValue1(a.type, missingDefaults)
3217 : Errors.AnnotationMissingDefaultValue(a.type, missingDefaults);
3218 log.error(a.pos(), errorKey);
3219 }
3220
3221 return isValid && validateTargetAnnotationValue(a);
3222 }
3223
3224 /* Validate the special java.lang.annotation.Target annotation */
3225 boolean validateTargetAnnotationValue(JCAnnotation a) {
3226 // special case: java.lang.annotation.Target must not have
3227 // repeated values in its value member
3228 if (a.annotationType.type.tsym != syms.annotationTargetType.tsym ||
3229 a.args.tail == null)
3230 return true;
3231
3232 boolean isValid = true;
3233 if (!a.args.head.hasTag(ASSIGN)) return false; // error recovery
3234 JCAssign assign = (JCAssign) a.args.head;
3235 Symbol m = TreeInfo.symbol(assign.lhs);
3236 if (m.name != names.value) return false;
3237 JCTree rhs = assign.rhs;
3238 if (!rhs.hasTag(NEWARRAY)) return false;
3239 JCNewArray na = (JCNewArray) rhs;
3240 Set<Symbol> targets = new HashSet<>();
3241 for (JCTree elem : na.elems) {
3242 if (!targets.add(TreeInfo.symbol(elem))) {
3243 isValid = false;
3244 log.error(elem.pos(), Errors.RepeatedAnnotationTarget);
3245 }
3246 }
3247 return isValid;
3248 }
3249
3250 void checkDeprecatedAnnotation(DiagnosticPosition pos, Symbol s) {
3251 if (lint.isEnabled(LintCategory.DEP_ANN) && s.isDeprecatableViaAnnotation() &&
3252 (s.flags() & DEPRECATED) != 0 &&
3253 !syms.deprecatedType.isErroneous() &&
3254 s.attribute(syms.deprecatedType.tsym) == null) {
3255 log.warning(LintCategory.DEP_ANN,
3256 pos, Warnings.MissingDeprecatedAnnotation);
3257 }
3258 // Note: @Deprecated has no effect on local variables, parameters and package decls.
3259 if (lint.isEnabled(LintCategory.DEPRECATION) && !s.isDeprecatableViaAnnotation()) {
3260 if (!syms.deprecatedType.isErroneous() && s.attribute(syms.deprecatedType.tsym) != null) {
3261 log.warning(LintCategory.DEPRECATION, pos,
3262 Warnings.DeprecatedAnnotationHasNoEffect(Kinds.kindName(s)));
3263 }
3264 }
3265 }
3266
3267 void checkDeprecated(final DiagnosticPosition pos, final Symbol other, final Symbol s) {
3268 checkDeprecated(() -> pos, other, s);
3269 }
3270
3271 void checkDeprecated(Supplier<DiagnosticPosition> pos, final Symbol other, final Symbol s) {
3272 if ( (s.isDeprecatedForRemoval()
3273 || s.isDeprecated() && !other.isDeprecated())
3274 && (s.outermostClass() != other.outermostClass() || s.outermostClass() == null)) {
3275 deferredLintHandler.report(() -> warnDeprecated(pos.get(), s));
3276 }
3277 }
3278
3279 void checkSunAPI(final DiagnosticPosition pos, final Symbol s) {
3280 if ((s.flags() & PROPRIETARY) != 0) {
3281 deferredLintHandler.report(() -> {
3282 log.mandatoryWarning(pos, Warnings.SunProprietary(s));
3283 });
3284 }
3285 }
3286
3287 void checkProfile(final DiagnosticPosition pos, final Symbol s) {
3288 if (profile != Profile.DEFAULT && (s.flags() & NOT_IN_PROFILE) != 0) {
3289 log.error(pos, Errors.NotInProfile(s, profile));
3290 }
3291 }
3292
3293 /* *************************************************************************
3294 * Check for recursive annotation elements.
3295 **************************************************************************/
3296
3297 /** Check for cycles in the graph of annotation elements.
3298 */
3299 void checkNonCyclicElements(JCClassDecl tree) {
3300 if ((tree.sym.flags_field & ANNOTATION) == 0) return;
3301 Assert.check((tree.sym.flags_field & LOCKED) == 0);
3302 try {
3303 tree.sym.flags_field |= LOCKED;
3304 for (JCTree def : tree.defs) {
3305 if (!def.hasTag(METHODDEF)) continue;
3306 JCMethodDecl meth = (JCMethodDecl)def;
3307 checkAnnotationResType(meth.pos(), meth.restype.type);
3308 }
3309 } finally {
3310 tree.sym.flags_field &= ~LOCKED;
3311 tree.sym.flags_field |= ACYCLIC_ANN;
3312 }
3313 }
3314
3315 void checkNonCyclicElementsInternal(DiagnosticPosition pos, TypeSymbol tsym) {
3316 if ((tsym.flags_field & ACYCLIC_ANN) != 0)
3317 return;
3318 if ((tsym.flags_field & LOCKED) != 0) {
3319 log.error(pos, Errors.CyclicAnnotationElement(tsym));
3320 return;
3321 }
3322 try {
3323 tsym.flags_field |= LOCKED;
3324 for (Symbol s : tsym.members().getSymbols(NON_RECURSIVE)) {
3325 if (s.kind != MTH)
3326 continue;
3327 checkAnnotationResType(pos, ((MethodSymbol)s).type.getReturnType());
3328 }
3329 } finally {
3330 tsym.flags_field &= ~LOCKED;
3331 tsym.flags_field |= ACYCLIC_ANN;
3332 }
3333 }
3334
3335 void checkAnnotationResType(DiagnosticPosition pos, Type type) {
3336 switch (type.getTag()) {
3337 case CLASS:
3338 if ((type.tsym.flags() & ANNOTATION) != 0)
3339 checkNonCyclicElementsInternal(pos, type.tsym);
3340 break;
3341 case ARRAY:
3342 checkAnnotationResType(pos, types.elemtype(type));
3343 break;
3344 default:
3345 break; // int etc
3346 }
3347 }
3348
3349 /* *************************************************************************
3350 * Check for cycles in the constructor call graph.
3351 **************************************************************************/
3352
3353 /** Check for cycles in the graph of constructors calling other
3354 * constructors.
3355 */
3356 void checkCyclicConstructors(JCClassDecl tree) {
3357 Map<Symbol,Symbol> callMap = new HashMap<>();
3358
3359 // enter each constructor this-call into the map
3360 for (List<JCTree> l = tree.defs; l.nonEmpty(); l = l.tail) {
3361 JCMethodInvocation app = TreeInfo.firstConstructorCall(l.head);
3362 if (app == null) continue;
3363 JCMethodDecl meth = (JCMethodDecl) l.head;
3364 if (TreeInfo.name(app.meth) == names._this) {
3365 callMap.put(meth.sym, TreeInfo.symbol(app.meth));
3366 } else {
3367 meth.sym.flags_field |= ACYCLIC;
3368 }
3369 }
3370
3371 // Check for cycles in the map
3372 Symbol[] ctors = new Symbol[0];
3373 ctors = callMap.keySet().toArray(ctors);
3374 for (Symbol caller : ctors) {
3375 checkCyclicConstructor(tree, caller, callMap);
3376 }
3377 }
3378
3379 /** Look in the map to see if the given constructor is part of a
3380 * call cycle.
3381 */
3382 private void checkCyclicConstructor(JCClassDecl tree, Symbol ctor,
3383 Map<Symbol,Symbol> callMap) {
3384 if (ctor != null && (ctor.flags_field & ACYCLIC) == 0) {
3385 if ((ctor.flags_field & LOCKED) != 0) {
3386 log.error(TreeInfo.diagnosticPositionFor(ctor, tree),
3387 Errors.RecursiveCtorInvocation);
3388 } else {
3389 ctor.flags_field |= LOCKED;
3390 checkCyclicConstructor(tree, callMap.remove(ctor), callMap);
3391 ctor.flags_field &= ~LOCKED;
3392 }
3393 ctor.flags_field |= ACYCLIC;
3394 }
3395 }
3396
3397 /* *************************************************************************
3398 * Miscellaneous
3399 **************************************************************************/
3400
3401 /**
3402 * Check for division by integer constant zero
3403 * @param pos Position for error reporting.
3404 * @param operator The operator for the expression
3405 * @param operand The right hand operand for the expression
3406 */
3407 void checkDivZero(final DiagnosticPosition pos, Symbol operator, Type operand) {
3408 if (operand.constValue() != null
3409 && operand.getTag().isSubRangeOf(LONG)
3410 && ((Number) (operand.constValue())).longValue() == 0) {
3411 int opc = ((OperatorSymbol)operator).opcode;
3412 if (opc == ByteCodes.idiv || opc == ByteCodes.imod
3413 || opc == ByteCodes.ldiv || opc == ByteCodes.lmod) {
3414 deferredLintHandler.report(() -> warnDivZero(pos));
3415 }
3416 }
3417 }
3418
3419 /**
3420 * Check for empty statements after if
3421 */
3422 void checkEmptyIf(JCIf tree) {
3423 if (tree.thenpart.hasTag(SKIP) && tree.elsepart == null &&
3424 lint.isEnabled(LintCategory.EMPTY))
3425 log.warning(LintCategory.EMPTY, tree.thenpart.pos(), Warnings.EmptyIf);
3426 }
3427
3428 /** Check that symbol is unique in given scope.
3429 * @param pos Position for error reporting.
3430 * @param sym The symbol.
3431 * @param s The scope.
3432 */
3433 boolean checkUnique(DiagnosticPosition pos, Symbol sym, Scope s) {
3434 if (sym.type.isErroneous())
3435 return true;
3436 if (sym.owner.name == names.any) return false;
3437 for (Symbol byName : s.getSymbolsByName(sym.name, NON_RECURSIVE)) {
3438 if (sym != byName &&
3439 (byName.flags() & CLASH) == 0 &&
3440 sym.kind == byName.kind &&
3441 sym.name != names.error &&
3442 (sym.kind != MTH ||
3443 types.hasSameArgs(sym.type, byName.type) ||
3444 types.hasSameArgs(types.erasure(sym.type), types.erasure(byName.type)))) {
3445 if ((sym.flags() & VARARGS) != (byName.flags() & VARARGS)) {
3446 sym.flags_field |= CLASH;
3447 varargsDuplicateError(pos, sym, byName);
3448 return true;
3449 } else if (sym.kind == MTH && !types.hasSameArgs(sym.type, byName.type, false)) {
3450 duplicateErasureError(pos, sym, byName);
3451 sym.flags_field |= CLASH;
3452 return true;
3453 } else {
3454 duplicateError(pos, byName);
3455 return false;
3456 }
3457 }
3458 }
3459 return true;
3460 }
3461
3462 /** Report duplicate declaration error.
3463 */
3464 void duplicateErasureError(DiagnosticPosition pos, Symbol sym1, Symbol sym2) {
3465 if (!sym1.type.isErroneous() && !sym2.type.isErroneous()) {
3466 log.error(pos, Errors.NameClashSameErasure(sym1, sym2));
3467 }
3468 }
3469
3470 /**Check that types imported through the ordinary imports don't clash with types imported
3471 * by other (static or ordinary) imports. Note that two static imports may import two clashing
3472 * types without an error on the imports.
3473 * @param toplevel The toplevel tree for which the test should be performed.
3474 */
3475 void checkImportsUnique(JCCompilationUnit toplevel) {
3476 WriteableScope ordinallyImportedSoFar = WriteableScope.create(toplevel.packge);
3477 WriteableScope staticallyImportedSoFar = WriteableScope.create(toplevel.packge);
3478 WriteableScope topLevelScope = toplevel.toplevelScope;
3479
3480 for (JCTree def : toplevel.defs) {
3481 if (!def.hasTag(IMPORT))
3482 continue;
3483
3484 JCImport imp = (JCImport) def;
3485
3486 if (imp.importScope == null)
3487 continue;
3488
3489 for (Symbol sym : imp.importScope.getSymbols(sym -> sym.kind == TYP)) {
3490 if (imp.isStatic()) {
3491 checkUniqueImport(imp.pos(), ordinallyImportedSoFar, staticallyImportedSoFar, topLevelScope, sym, true);
3492 staticallyImportedSoFar.enter(sym);
3493 } else {
3494 checkUniqueImport(imp.pos(), ordinallyImportedSoFar, staticallyImportedSoFar, topLevelScope, sym, false);
3495 ordinallyImportedSoFar.enter(sym);
3496 }
3497 }
3498
3499 imp.importScope = null;
3500 }
3501 }
3502
3503 /** Check that single-type import is not already imported or top-level defined,
3504 * but make an exception for two single-type imports which denote the same type.
3505 * @param pos Position for error reporting.
3506 * @param ordinallyImportedSoFar A Scope containing types imported so far through
3507 * ordinary imports.
3508 * @param staticallyImportedSoFar A Scope containing types imported so far through
3509 * static imports.
3510 * @param topLevelScope The current file's top-level Scope
3511 * @param sym The symbol.
3512 * @param staticImport Whether or not this was a static import
3513 */
3514 private boolean checkUniqueImport(DiagnosticPosition pos, Scope ordinallyImportedSoFar,
3515 Scope staticallyImportedSoFar, Scope topLevelScope,
3516 Symbol sym, boolean staticImport) {
3517 Filter<Symbol> duplicates = candidate -> candidate != sym && !candidate.type.isErroneous();
3518 Symbol ordinaryClashing = ordinallyImportedSoFar.findFirst(sym.name, duplicates);
3519 Symbol staticClashing = null;
3520 if (ordinaryClashing == null && !staticImport) {
3521 staticClashing = staticallyImportedSoFar.findFirst(sym.name, duplicates);
3522 }
3523 if (ordinaryClashing != null || staticClashing != null) {
3524 if (ordinaryClashing != null)
3525 log.error(pos, Errors.AlreadyDefinedSingleImport(ordinaryClashing));
3526 else
3527 log.error(pos, Errors.AlreadyDefinedStaticSingleImport(staticClashing));
3528 return false;
3529 }
3530 Symbol clashing = topLevelScope.findFirst(sym.name, duplicates);
3531 if (clashing != null) {
3532 log.error(pos, Errors.AlreadyDefinedThisUnit(clashing));
3533 return false;
3534 }
3535 return true;
3536 }
3537
3538 /** Check that a qualified name is in canonical form (for import decls).
3539 */
3540 public void checkCanonical(JCTree tree) {
3541 if (!isCanonical(tree))
3542 log.error(tree.pos(),
3543 Errors.ImportRequiresCanonical(TreeInfo.symbol(tree)));
3544 }
3545 // where
3546 private boolean isCanonical(JCTree tree) {
3547 while (tree.hasTag(SELECT)) {
3548 JCFieldAccess s = (JCFieldAccess) tree;
3549 if (s.sym.owner.getQualifiedName() != TreeInfo.symbol(s.selected).getQualifiedName())
3550 return false;
3551 tree = s.selected;
3552 }
3553 return true;
3554 }
3555
3556 /** Check that an auxiliary class is not accessed from any other file than its own.
3557 */
3558 void checkForBadAuxiliaryClassAccess(DiagnosticPosition pos, Env<AttrContext> env, ClassSymbol c) {
3559 if (lint.isEnabled(Lint.LintCategory.AUXILIARYCLASS) &&
3560 (c.flags() & AUXILIARY) != 0 &&
3561 rs.isAccessible(env, c) &&
3562 !fileManager.isSameFile(c.sourcefile, env.toplevel.sourcefile))
3563 {
3564 log.warning(pos,
3565 Warnings.AuxiliaryClassAccessedFromOutsideOfItsSourceFile(c, c.sourcefile));
3566 }
3567 }
3568
3569 private class ConversionWarner extends Warner {
3570 final String uncheckedKey;
3571 final Type found;
3572 final Type expected;
3573 public ConversionWarner(DiagnosticPosition pos, String uncheckedKey, Type found, Type expected) {
3574 super(pos);
3575 this.uncheckedKey = uncheckedKey;
3576 this.found = found;
3577 this.expected = expected;
3578 }
3579
3580 @Override
3581 public void warn(LintCategory lint) {
3582 boolean warned = this.warned;
3583 super.warn(lint);
3584 if (warned) return; // suppress redundant diagnostics
3585 switch (lint) {
3586 case UNCHECKED:
3587 Check.this.warnUnchecked(pos(), Warnings.ProbFoundReq(diags.fragment(uncheckedKey), found, expected));
3588 break;
3589 case VARARGS:
3590 if (method != null &&
3591 method.attribute(syms.trustMeType.tsym) != null &&
3592 isTrustMeAllowedOnMethod(method) &&
3593 !types.isReifiable(method.type.getParameterTypes().last())) {
3594 Check.this.warnUnsafeVararg(pos(), Warnings.VarargsUnsafeUseVarargsParam(method.params.last()));
3595 }
3596 break;
3597 default:
3598 throw new AssertionError("Unexpected lint: " + lint);
3599 }
3600 }
3601 }
3602
3603 public Warner castWarner(DiagnosticPosition pos, Type found, Type expected) {
3604 return new ConversionWarner(pos, "unchecked.cast.to.type", found, expected);
3605 }
3606
3607 public Warner convertWarner(DiagnosticPosition pos, Type found, Type expected) {
3608 return new ConversionWarner(pos, "unchecked.assign", found, expected);
3609 }
3610
3611 public void checkFunctionalInterface(JCClassDecl tree, ClassSymbol cs) {
3612 Compound functionalType = cs.attribute(syms.functionalInterfaceType.tsym);
3613
3614 if (functionalType != null) {
3615 try {
3616 types.findDescriptorSymbol((TypeSymbol)cs);
3617 } catch (Types.FunctionDescriptorLookupError ex) {
3618 DiagnosticPosition pos = tree.pos();
3619 for (JCAnnotation a : tree.getModifiers().annotations) {
3620 if (a.annotationType.type.tsym == syms.functionalInterfaceType.tsym) {
3621 pos = a.pos();
3622 break;
3623 }
3624 }
3625 log.error(pos, Errors.BadFunctionalIntfAnno1(ex.getDiagnostic()));
3626 }
3627 }
3628 }
3629
3630 public void checkImportsResolvable(final JCCompilationUnit toplevel) {
3631 for (final JCImport imp : toplevel.getImports()) {
3632 if (!imp.staticImport || !imp.qualid.hasTag(SELECT))
3633 continue;
3634 final JCFieldAccess select = (JCFieldAccess) imp.qualid;
3635 final Symbol origin;
3636 if (select.name == names.asterisk || (origin = TreeInfo.symbol(select.selected)) == null || origin.kind != TYP)
3637 continue;
3638
3639 TypeSymbol site = (TypeSymbol) TreeInfo.symbol(select.selected);
3640 if (!checkTypeContainsImportableElement(site, site, toplevel.packge, select.name, new HashSet<Symbol>())) {
3641 log.error(imp.pos(),
3642 Errors.CantResolveLocation(KindName.STATIC,
3643 select.name,
3644 null,
3645 null,
3646 Fragments.Location(kindName(site),
3647 site,
3648 null)));
3649 }
3650 }
3651 }
3652
3653 // Check that packages imported are in scope (JLS 7.4.3, 6.3, 6.5.3.1, 6.5.3.2)
3654 public void checkImportedPackagesObservable(final JCCompilationUnit toplevel) {
3655 OUTER: for (JCImport imp : toplevel.getImports()) {
3656 if (!imp.staticImport && TreeInfo.name(imp.qualid) == names.asterisk) {
3657 TypeSymbol tsym = ((JCFieldAccess)imp.qualid).selected.type.tsym;
3658 if (tsym.kind == PCK && tsym.members().isEmpty() &&
3659 !(Feature.IMPORT_ON_DEMAND_OBSERVABLE_PACKAGES.allowedInSource(source) && tsym.exists())) {
3660 log.error(DiagnosticFlag.RESOLVE_ERROR, imp.pos, Errors.DoesntExist(tsym));
3661 }
3662 }
3663 }
3664 }
3665
3666 private boolean checkTypeContainsImportableElement(TypeSymbol tsym, TypeSymbol origin, PackageSymbol packge, Name name, Set<Symbol> processed) {
3667 if (tsym == null || !processed.add(tsym))
3668 return false;
3669
3670 // also search through inherited names
3671 if (checkTypeContainsImportableElement(types.supertype(tsym.type).tsym, origin, packge, name, processed))
3672 return true;
3673
3674 for (Type t : types.interfaces(tsym.type))
3675 if (checkTypeContainsImportableElement(t.tsym, origin, packge, name, processed))
3676 return true;
3677
3678 for (Symbol sym : tsym.members().getSymbolsByName(name)) {
3679 if (sym.isStatic() &&
3680 importAccessible(sym, packge) &&
3681 sym.isMemberOf(origin, types)) {
3682 return true;
3683 }
3684 }
3685
3686 return false;
3687 }
3688
3689 // is the sym accessible everywhere in packge?
3690 public boolean importAccessible(Symbol sym, PackageSymbol packge) {
3691 try {
3692 int flags = (int)(sym.flags() & AccessFlags);
3693 switch (flags) {
3694 default:
3695 case PUBLIC:
3696 return true;
3697 case PRIVATE:
3698 return false;
3699 case 0:
3700 case PROTECTED:
3701 return sym.packge() == packge;
3702 }
3703 } catch (ClassFinder.BadClassFile err) {
3704 throw err;
3705 } catch (CompletionFailure ex) {
3706 return false;
3707 }
3708 }
3709
3710 public void checkLeaksNotAccessible(Env<AttrContext> env, JCClassDecl check) {
3711 JCCompilationUnit toplevel = env.toplevel;
3712
3713 if ( toplevel.modle == syms.unnamedModule
3714 || toplevel.modle == syms.noModule
3715 || (check.sym.flags() & COMPOUND) != 0) {
3716 return ;
3717 }
3718
3719 ExportsDirective currentExport = findExport(toplevel.packge);
3720
3721 if ( currentExport == null //not exported
3722 || currentExport.modules != null) //don't check classes in qualified export
3723 return ;
3724
3725 new TreeScanner() {
3726 Lint lint = env.info.lint;
3727 boolean inSuperType;
3728
3729 @Override
3730 public void visitBlock(JCBlock tree) {
3731 }
3732 @Override
3733 public void visitMethodDef(JCMethodDecl tree) {
3734 if (!isAPISymbol(tree.sym))
3735 return;
3736 Lint prevLint = lint;
3737 try {
3738 lint = lint.augment(tree.sym);
3739 if (lint.isEnabled(LintCategory.EXPORTS)) {
3740 super.visitMethodDef(tree);
3741 }
3742 } finally {
3743 lint = prevLint;
3744 }
3745 }
3746 @Override
3747 public void visitVarDef(JCVariableDecl tree) {
3748 if (!isAPISymbol(tree.sym) && tree.sym.owner.kind != MTH)
3749 return;
3750 Lint prevLint = lint;
3751 try {
3752 lint = lint.augment(tree.sym);
3753 if (lint.isEnabled(LintCategory.EXPORTS)) {
3754 scan(tree.mods);
3755 scan(tree.vartype);
3756 }
3757 } finally {
3758 lint = prevLint;
3759 }
3760 }
3761 @Override
3762 public void visitClassDef(JCClassDecl tree) {
3763 if (tree != check)
3764 return ;
3765
3766 if (!isAPISymbol(tree.sym))
3767 return ;
3768
3769 Lint prevLint = lint;
3770 try {
3771 lint = lint.augment(tree.sym);
3772 if (lint.isEnabled(LintCategory.EXPORTS)) {
3773 scan(tree.mods);
3774 scan(tree.typarams);
3775 try {
3776 inSuperType = true;
3777 scan(tree.extending);
3778 scan(tree.implementing);
3779 } finally {
3780 inSuperType = false;
3781 }
3782 scan(tree.defs);
3783 }
3784 } finally {
3785 lint = prevLint;
3786 }
3787 }
3788 @Override
3789 public void visitTypeApply(JCTypeApply tree) {
3790 scan(tree.clazz);
3791 boolean oldInSuperType = inSuperType;
3792 try {
3793 inSuperType = false;
3794 scan(tree.arguments);
3795 } finally {
3796 inSuperType = oldInSuperType;
3797 }
3798 }
3799 @Override
3800 public void visitIdent(JCIdent tree) {
3801 Symbol sym = TreeInfo.symbol(tree);
3802 if (sym.kind == TYP && !sym.type.hasTag(TYPEVAR)) {
3803 checkVisible(tree.pos(), sym, toplevel.packge, inSuperType);
3804 }
3805 }
3806
3807 @Override
3808 public void visitSelect(JCFieldAccess tree) {
3809 Symbol sym = TreeInfo.symbol(tree);
3810 Symbol sitesym = TreeInfo.symbol(tree.selected);
3811 if (sym.kind == TYP && sitesym.kind == PCK) {
3812 checkVisible(tree.pos(), sym, toplevel.packge, inSuperType);
3813 } else {
3814 super.visitSelect(tree);
3815 }
3816 }
3817
3818 @Override
3819 public void visitAnnotation(JCAnnotation tree) {
3820 if (tree.attribute.type.tsym.getAnnotation(java.lang.annotation.Documented.class) != null)
3821 super.visitAnnotation(tree);
3822 }
3823
3824 }.scan(check);
3825 }
3826 //where:
3827 private ExportsDirective findExport(PackageSymbol pack) {
3828 for (ExportsDirective d : pack.modle.exports) {
3829 if (d.packge == pack)
3830 return d;
3831 }
3832
3833 return null;
3834 }
3835 private boolean isAPISymbol(Symbol sym) {
3836 while (sym.kind != PCK) {
3837 if ((sym.flags() & Flags.PUBLIC) == 0 && (sym.flags() & Flags.PROTECTED) == 0) {
3838 return false;
3839 }
3840 sym = sym.owner;
3841 }
3842 return true;
3843 }
3844 private void checkVisible(DiagnosticPosition pos, Symbol what, PackageSymbol inPackage, boolean inSuperType) {
3845 if (!isAPISymbol(what) && !inSuperType) { //package private/private element
3846 log.warning(LintCategory.EXPORTS, pos, Warnings.LeaksNotAccessible(kindName(what), what, what.packge().modle));
3847 return ;
3848 }
3849
3850 PackageSymbol whatPackage = what.packge();
3851 ExportsDirective whatExport = findExport(whatPackage);
3852 ExportsDirective inExport = findExport(inPackage);
3853
3854 if (whatExport == null) { //package not exported:
3855 log.warning(LintCategory.EXPORTS, pos, Warnings.LeaksNotAccessibleUnexported(kindName(what), what, what.packge().modle));
3856 return ;
3857 }
3858
3859 if (whatExport.modules != null) {
3860 if (inExport.modules == null || !whatExport.modules.containsAll(inExport.modules)) {
3861 log.warning(LintCategory.EXPORTS, pos, Warnings.LeaksNotAccessibleUnexportedQualified(kindName(what), what, what.packge().modle));
3862 }
3863 }
3864
3865 if (whatPackage.modle != inPackage.modle && whatPackage.modle != syms.java_base) {
3866 //check that relativeTo.modle requires transitive what.modle, somehow:
3867 List<ModuleSymbol> todo = List.of(inPackage.modle);
3868
3869 while (todo.nonEmpty()) {
3870 ModuleSymbol current = todo.head;
3871 todo = todo.tail;
3872 if (current == whatPackage.modle)
3873 return ; //OK
3874 if ((current.flags() & Flags.AUTOMATIC_MODULE) != 0)
3875 continue; //for automatic modules, don't look into their dependencies
3876 for (RequiresDirective req : current.requires) {
3877 if (req.isTransitive()) {
3878 todo = todo.prepend(req.module);
3879 }
3880 }
3881 }
3882
3883 log.warning(LintCategory.EXPORTS, pos, Warnings.LeaksNotAccessibleNotRequiredTransitive(kindName(what), what, what.packge().modle));
3884 }
3885 }
3886
3887 void checkModuleExists(final DiagnosticPosition pos, ModuleSymbol msym) {
3888 if (msym.kind != MDL) {
3889 deferredLintHandler.report(() -> {
3890 if (lint.isEnabled(LintCategory.MODULE))
3891 log.warning(LintCategory.MODULE, pos, Warnings.ModuleNotFound(msym));
3892 });
3893 }
3894 }
3895
3896 void checkPackageExistsForOpens(final DiagnosticPosition pos, PackageSymbol packge) {
3897 if (packge.members().isEmpty() &&
3898 ((packge.flags() & Flags.HAS_RESOURCE) == 0)) {
3899 deferredLintHandler.report(() -> {
3900 if (lint.isEnabled(LintCategory.OPENS))
3901 log.warning(pos, Warnings.PackageEmptyOrNotFound(packge));
3902 });
3903 }
3904 }
3905
3906 void checkModuleRequires(final DiagnosticPosition pos, final RequiresDirective rd) {
3907 if ((rd.module.flags() & Flags.AUTOMATIC_MODULE) != 0) {
3908 deferredLintHandler.report(() -> {
3909 if (rd.isTransitive() && lint.isEnabled(LintCategory.REQUIRES_TRANSITIVE_AUTOMATIC)) {
3910 log.warning(pos, Warnings.RequiresTransitiveAutomatic);
3911 } else if (lint.isEnabled(LintCategory.REQUIRES_AUTOMATIC)) {
3912 log.warning(pos, Warnings.RequiresAutomatic);
3913 }
3914 });
3915 }
3916 }
3917
3918 }