1 /*
2 * Copyright (c) 1999, 2026, 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.BiConsumer;
30 import java.util.function.Consumer;
31 import java.util.function.Function;
32 import java.util.stream.Stream;
33
34 import javax.lang.model.element.ElementKind;
35 import javax.tools.JavaFileObject;
36
37 import com.sun.source.tree.CaseTree;
38 import com.sun.source.tree.IdentifierTree;
39 import com.sun.source.tree.MemberReferenceTree.ReferenceMode;
40 import com.sun.source.tree.MemberSelectTree;
41 import com.sun.source.tree.TreeVisitor;
42 import com.sun.source.util.SimpleTreeVisitor;
43 import com.sun.tools.javac.code.*;
44 import com.sun.tools.javac.code.Lint.LintCategory;
45 import com.sun.tools.javac.code.LintMapper;
46 import com.sun.tools.javac.code.Scope.WriteableScope;
47 import com.sun.tools.javac.code.Source.Feature;
48 import com.sun.tools.javac.code.Symbol.*;
49 import com.sun.tools.javac.code.Type.*;
50 import com.sun.tools.javac.code.Types.FunctionDescriptorLookupError;
51 import com.sun.tools.javac.comp.ArgumentAttr.LocalCacheContext;
52 import com.sun.tools.javac.comp.Check.CheckContext;
53 import com.sun.tools.javac.comp.DeferredAttr.AttrMode;
54 import com.sun.tools.javac.comp.MatchBindingsComputer.MatchBindings;
55 import com.sun.tools.javac.jvm.*;
56
57 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.Diamond;
58 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.DiamondInvalidArg;
59 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.DiamondInvalidArgs;
60
61 import com.sun.tools.javac.resources.CompilerProperties.Errors;
62 import com.sun.tools.javac.resources.CompilerProperties.Fragments;
63 import com.sun.tools.javac.resources.CompilerProperties.LintWarnings;
64 import com.sun.tools.javac.resources.CompilerProperties.Warnings;
65 import com.sun.tools.javac.tree.*;
66 import com.sun.tools.javac.tree.JCTree.*;
67 import com.sun.tools.javac.tree.JCTree.JCPolyExpression.*;
68 import com.sun.tools.javac.util.*;
69 import com.sun.tools.javac.util.DefinedBy.Api;
70 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
71 import com.sun.tools.javac.util.JCDiagnostic.Error;
72 import com.sun.tools.javac.util.JCDiagnostic.Fragment;
73 import com.sun.tools.javac.util.JCDiagnostic.Warning;
74 import com.sun.tools.javac.util.List;
75
76 import static com.sun.tools.javac.code.Flags.*;
77 import static com.sun.tools.javac.code.Flags.ANNOTATION;
78 import static com.sun.tools.javac.code.Flags.BLOCK;
79 import static com.sun.tools.javac.code.Kinds.*;
80 import static com.sun.tools.javac.code.Kinds.Kind.*;
81 import static com.sun.tools.javac.code.TypeTag.*;
82 import static com.sun.tools.javac.code.TypeTag.WILDCARD;
83 import static com.sun.tools.javac.tree.JCTree.Tag.*;
84
85 /** This is the main context-dependent analysis phase in GJC. It
86 * encompasses name resolution, type checking and constant folding as
87 * subtasks. Some subtasks involve auxiliary classes.
88 * @see Check
89 * @see Resolve
90 * @see ConstFold
91 * @see Infer
92 *
93 * <p><b>This is NOT part of any supported API.
94 * If you write code that depends on this, you do so at your own risk.
95 * This code and its internal interfaces are subject to change or
96 * deletion without notice.</b>
97 */
98 public class Attr extends JCTree.Visitor {
99 protected static final Context.Key<Attr> attrKey = new Context.Key<>();
100
101 final Names names;
102 final Log log;
103 final LintMapper lintMapper;
104 final Symtab syms;
105 final Resolve rs;
106 final Operators operators;
107 final Infer infer;
108 final Analyzer analyzer;
109 final DeferredAttr deferredAttr;
110 final Check chk;
111 final Flow flow;
112 final MemberEnter memberEnter;
113 final TypeEnter typeEnter;
114 final TreeMaker make;
115 final ConstFold cfolder;
116 final Enter enter;
117 final Target target;
118 final Types types;
119 final Preview preview;
120 final JCDiagnostic.Factory diags;
121 final TypeAnnotations typeAnnotations;
122 final TypeEnvs typeEnvs;
123 final Dependencies dependencies;
124 final Annotate annotate;
125 final ArgumentAttr argumentAttr;
126 final MatchBindingsComputer matchBindingsComputer;
127 final AttrRecover attrRecover;
128 final boolean captureMRefReturnType;
129
130 public static Attr instance(Context context) {
131 Attr instance = context.get(attrKey);
132 if (instance == null)
133 instance = new Attr(context);
134 return instance;
135 }
136
137 @SuppressWarnings("this-escape")
138 protected Attr(Context context) {
139 context.put(attrKey, this);
140
141 names = Names.instance(context);
142 log = Log.instance(context);
143 lintMapper = LintMapper.instance(context);
144 syms = Symtab.instance(context);
145 rs = Resolve.instance(context);
146 operators = Operators.instance(context);
147 chk = Check.instance(context);
148 flow = Flow.instance(context);
149 memberEnter = MemberEnter.instance(context);
150 typeEnter = TypeEnter.instance(context);
151 make = TreeMaker.instance(context);
152 enter = Enter.instance(context);
153 infer = Infer.instance(context);
154 analyzer = Analyzer.instance(context);
155 deferredAttr = DeferredAttr.instance(context);
156 cfolder = ConstFold.instance(context);
157 target = Target.instance(context);
158 types = Types.instance(context);
159 preview = Preview.instance(context);
160 diags = JCDiagnostic.Factory.instance(context);
161 annotate = Annotate.instance(context);
162 typeAnnotations = TypeAnnotations.instance(context);
163 typeEnvs = TypeEnvs.instance(context);
164 dependencies = Dependencies.instance(context);
165 argumentAttr = ArgumentAttr.instance(context);
166 matchBindingsComputer = MatchBindingsComputer.instance(context);
167 attrRecover = AttrRecover.instance(context);
168
169 Options options = Options.instance(context);
170
171 Source source = Source.instance(context);
172 allowReifiableTypesInInstanceof = Feature.REIFIABLE_TYPES_INSTANCEOF.allowedInSource(source);
173 allowRecords = Feature.RECORDS.allowedInSource(source);
174 allowPatternSwitch = (preview.isEnabled() || !preview.isPreview(Feature.PATTERN_SWITCH)) &&
175 Feature.PATTERN_SWITCH.allowedInSource(source);
176 allowUnconditionalPatternsInstanceOf =
177 Feature.UNCONDITIONAL_PATTERN_IN_INSTANCEOF.allowedInSource(source);
178 sourceName = source.name;
179 useBeforeDeclarationWarning = options.isSet("useBeforeDeclarationWarning");
180 captureMRefReturnType = Source.Feature.CAPTURE_MREF_RETURN_TYPE.allowedInSource(source);
181
182 statInfo = new ResultInfo(KindSelector.NIL, Type.noType);
183 varAssignmentInfo = new ResultInfo(KindSelector.ASG, Type.noType);
184 varAssignmentOpInfo = new ResultInfo(KindSelector.of(KindSelector.VAL, KindSelector.ASG), Type.noType);
185 unknownExprInfo = new ResultInfo(KindSelector.VAL, Type.noType);
186 methodAttrInfo = new MethodAttrInfo();
187 unknownTypeInfo = new ResultInfo(KindSelector.TYP, Type.noType);
188 unknownTypeExprInfo = new ResultInfo(KindSelector.VAL_TYP, Type.noType);
189 recoveryInfo = new RecoveryInfo(deferredAttr.emptyDeferredAttrContext);
190 initBlockType = new MethodType(List.nil(), syms.voidType, List.nil(), syms.methodClass);
191 allowValueClasses = preview.isEnabled() && Feature.VALUE_CLASSES.allowedInSource(source);
192 }
193
194 /** Switch: reifiable types in instanceof enabled?
195 */
196 boolean allowReifiableTypesInInstanceof;
197
198 /** Are records allowed
199 */
200 private final boolean allowRecords;
201
202 /** Are patterns in switch allowed
203 */
204 private final boolean allowPatternSwitch;
205
206 /** Are unconditional patterns in instanceof allowed
207 */
208 private final boolean allowUnconditionalPatternsInstanceOf;
209
210 /** Are value classes allowed
211 */
212 private final boolean allowValueClasses;
213
214 /**
215 * Switch: warn about use of variable before declaration?
216 * RFE: 6425594
217 */
218 boolean useBeforeDeclarationWarning;
219
220 /**
221 * Switch: name of source level; used for error reporting.
222 */
223 String sourceName;
224
225 /** Check kind and type of given tree against protokind and prototype.
226 * If check succeeds, store type in tree and return it.
227 * If check fails, store errType in tree and return it.
228 * No checks are performed if the prototype is a method type.
229 * It is not necessary in this case since we know that kind and type
230 * are correct.
231 *
232 * @param tree The tree whose kind and type is checked
233 * @param found The computed type of the tree
234 * @param ownkind The computed kind of the tree
235 * @param resultInfo The expected result of the tree
236 */
237 Type check(final JCTree tree,
238 final Type found,
239 final KindSelector ownkind,
240 final ResultInfo resultInfo) {
241 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
242 Type owntype;
243 boolean shouldCheck = !found.hasTag(ERROR) &&
244 !resultInfo.pt.hasTag(METHOD) &&
245 !resultInfo.pt.hasTag(FORALL);
246 if (shouldCheck && !ownkind.subset(resultInfo.pkind)) {
247 log.error(tree.pos(),
248 Errors.UnexpectedType(resultInfo.pkind.kindNames(),
249 ownkind.kindNames()));
250 owntype = types.createErrorType(found);
251 } else if (inferenceContext.free(found)) {
252 //delay the check if there are inference variables in the found type
253 //this means we are dealing with a partially inferred poly expression
254 owntype = shouldCheck ? resultInfo.pt : found;
255 if (resultInfo.checkMode.installPostInferenceHook()) {
256 inferenceContext.addFreeTypeListener(List.of(found),
257 instantiatedContext -> {
258 ResultInfo pendingResult =
259 resultInfo.dup(inferenceContext.asInstType(resultInfo.pt));
260 check(tree, inferenceContext.asInstType(found), ownkind, pendingResult);
261 });
262 }
263 } else {
264 owntype = shouldCheck ?
265 resultInfo.check(tree, found) :
266 found;
267 }
268 if (resultInfo.checkMode.updateTreeType()) {
269 tree.type = owntype;
270 }
271 return owntype;
272 }
273
274 /** Is given blank final variable assignable, i.e. in a scope where it
275 * may be assigned to even though it is final?
276 * @param v The blank final variable.
277 * @param env The current environment.
278 */
279 boolean isAssignableAsBlankFinal(VarSymbol v, Env<AttrContext> env) {
280 Symbol owner = env.info.scope.owner;
281 // owner refers to the innermost variable, method or
282 // initializer block declaration at this point.
283 boolean isAssignable =
284 v.owner == owner
285 ||
286 ((owner.name == names.init || // i.e. we are in a constructor
287 owner.kind == VAR || // i.e. we are in a variable initializer
288 (owner.flags() & BLOCK) != 0) // i.e. we are in an initializer block
289 &&
290 v.owner == owner.owner
291 &&
292 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env));
293 boolean insideCompactConstructor = env.enclMethod != null && TreeInfo.isCompactConstructor(env.enclMethod);
294 return isAssignable & !insideCompactConstructor;
295 }
296
297 /** Check that variable can be assigned to.
298 * @param pos The current source code position.
299 * @param v The assigned variable
300 * @param base If the variable is referred to in a Select, the part
301 * to the left of the `.', null otherwise.
302 * @param env The current environment.
303 */
304 void checkAssignable(DiagnosticPosition pos, VarSymbol v, JCTree base, Env<AttrContext> env) {
305 if (v.name == names._this) {
306 log.error(pos, Errors.CantAssignValToThis);
307 return;
308 }
309 if ((v.flags() & FINAL) != 0 &&
310 ((v.flags() & HASINIT) != 0
311 ||
312 !((base == null ||
313 TreeInfo.isThisQualifier(base)) &&
314 isAssignableAsBlankFinal(v, env)))) {
315 if (v.isResourceVariable()) { //TWR resource
316 log.error(pos, Errors.TryResourceMayNotBeAssigned(v));
317 } else {
318 log.error(pos, Errors.CantAssignValToVar(Flags.toSource(v.flags() & (STATIC | FINAL)), v));
319 }
320 return;
321 }
322 }
323
324 /** Does tree represent a static reference to an identifier?
325 * It is assumed that tree is either a SELECT or an IDENT.
326 * We have to weed out selects from non-type names here.
327 * @param tree The candidate tree.
328 */
329 boolean isStaticReference(JCTree tree) {
330 if (tree.hasTag(SELECT)) {
331 Symbol lsym = TreeInfo.symbol(((JCFieldAccess) tree).selected);
332 if (lsym == null || lsym.kind != TYP) {
333 return false;
334 }
335 }
336 return true;
337 }
338
339 /** Is this symbol a type?
340 */
341 static boolean isType(Symbol sym) {
342 return sym != null && sym.kind == TYP;
343 }
344
345 /** Attribute a parsed identifier.
346 * @param tree Parsed identifier name
347 * @param topLevel The toplevel to use
348 */
349 public Symbol attribIdent(JCTree tree, JCCompilationUnit topLevel) {
350 Env<AttrContext> localEnv = enter.topLevelEnv(topLevel);
351 localEnv.enclClass = make.ClassDef(make.Modifiers(0),
352 syms.errSymbol.name,
353 null, null, null, null);
354 localEnv.enclClass.sym = syms.errSymbol;
355 return attribIdent(tree, localEnv);
356 }
357
358 /** Attribute a parsed identifier.
359 * @param tree Parsed identifier name
360 * @param env The env to use
361 */
362 public Symbol attribIdent(JCTree tree, Env<AttrContext> env) {
363 return tree.accept(identAttributer, env);
364 }
365 // where
366 private TreeVisitor<Symbol,Env<AttrContext>> identAttributer = new IdentAttributer();
367 private class IdentAttributer extends SimpleTreeVisitor<Symbol,Env<AttrContext>> {
368 @Override @DefinedBy(Api.COMPILER_TREE)
369 public Symbol visitMemberSelect(MemberSelectTree node, Env<AttrContext> env) {
370 Symbol site = visit(node.getExpression(), env);
371 if (site == null || site.kind == ERR || site.kind == ABSENT_TYP || site.kind == HIDDEN)
372 return site;
373 Name name = (Name)node.getIdentifier();
374 if (site.kind == PCK) {
375 env.toplevel.packge = (PackageSymbol)site;
376 return rs.findIdentInPackage(null, env, (TypeSymbol)site, name,
377 KindSelector.TYP_PCK);
378 } else {
379 env.enclClass.sym = (ClassSymbol)site;
380 return rs.findMemberType(env, site.asType(), name, (TypeSymbol)site);
381 }
382 }
383
384 @Override @DefinedBy(Api.COMPILER_TREE)
385 public Symbol visitIdentifier(IdentifierTree node, Env<AttrContext> env) {
386 return rs.findIdent(null, env, (Name)node.getName(), KindSelector.TYP_PCK);
387 }
388 }
389
390 public Type coerce(Type etype, Type ttype) {
391 return cfolder.coerce(etype, ttype);
392 }
393
394 public Type attribType(JCTree node, TypeSymbol sym) {
395 Env<AttrContext> env = typeEnvs.get(sym);
396 Env<AttrContext> localEnv = env.dup(node, env.info.dup());
397 return attribTree(node, localEnv, unknownTypeInfo);
398 }
399
400 public Type attribImportQualifier(JCImport tree, Env<AttrContext> env) {
401 // Attribute qualifying package or class.
402 JCFieldAccess s = tree.qualid;
403 return attribTree(s.selected, env,
404 new ResultInfo(tree.staticImport ?
405 KindSelector.TYP : KindSelector.TYP_PCK,
406 Type.noType));
407 }
408
409 public Env<AttrContext> attribExprToTree(JCTree expr, Env<AttrContext> env, JCTree tree) {
410 return attribToTree(expr, env, tree, unknownExprInfo);
411 }
412
413 public Env<AttrContext> attribStatToTree(JCTree stmt, Env<AttrContext> env, JCTree tree) {
414 return attribToTree(stmt, env, tree, statInfo);
415 }
416
417 private Env<AttrContext> attribToTree(JCTree root, Env<AttrContext> env, JCTree tree, ResultInfo resultInfo) {
418 breakTree = tree;
419 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
420 try {
421 deferredAttr.attribSpeculative(root, env, resultInfo,
422 null, DeferredAttr.AttributionMode.ATTRIB_TO_TREE,
423 argumentAttr.withLocalCacheContext());
424 attrRecover.doRecovery();
425 } catch (BreakAttr b) {
426 return b.env;
427 } catch (AssertionError ae) {
428 if (ae.getCause() instanceof BreakAttr breakAttr) {
429 return breakAttr.env;
430 } else {
431 throw ae;
432 }
433 } finally {
434 breakTree = null;
435 log.useSource(prev);
436 }
437 return env;
438 }
439
440 public <R> R runWithAttributedMethod(Env<AttrContext> env, JCMethodDecl tree, Function<JCBlock, R> attributedAction) {
441 JavaFileObject prevSource = log.useSource(env.toplevel.sourcefile);
442 try {
443 annotate.queueScanTreeAndTypeAnnotate(tree.body, env, tree.sym);
444 annotate.flush();
445 JCBlock dupTree = (JCBlock)deferredAttr.attribSpeculative(tree.body, env, statInfo,
446 null, DeferredAttr.AttributionMode.ATTRIB_TO_TREE,
447 argumentAttr.withLocalCacheContext());
448 return attributedAction.apply(dupTree);
449 } finally {
450 attrRecover.doRecovery();
451 log.useSource(prevSource);
452 }
453 }
454
455 private JCTree breakTree = null;
456
457 private static class BreakAttr extends RuntimeException {
458 static final long serialVersionUID = -6924771130405446405L;
459 private transient Env<AttrContext> env;
460 private BreakAttr(Env<AttrContext> env) {
461 this.env = env;
462 }
463 }
464
465 /**
466 * Mode controlling behavior of Attr.Check
467 */
468 enum CheckMode {
469
470 NORMAL,
471
472 /**
473 * Mode signalling 'fake check' - skip tree update. A side-effect of this mode is
474 * that the captured var cache in {@code InferenceContext} will be used in read-only
475 * mode when performing inference checks.
476 */
477 NO_TREE_UPDATE {
478 @Override
479 public boolean updateTreeType() {
480 return false;
481 }
482 },
483 /**
484 * Mode signalling that caller will manage free types in tree decorations.
485 */
486 NO_INFERENCE_HOOK {
487 @Override
488 public boolean installPostInferenceHook() {
489 return false;
490 }
491 };
492
493 public boolean updateTreeType() {
494 return true;
495 }
496 public boolean installPostInferenceHook() {
497 return true;
498 }
499 }
500
501
502 class ResultInfo {
503 final KindSelector pkind;
504 final Type pt;
505 final CheckContext checkContext;
506 final CheckMode checkMode;
507
508 ResultInfo(KindSelector pkind, Type pt) {
509 this(pkind, pt, chk.basicHandler, CheckMode.NORMAL);
510 }
511
512 ResultInfo(KindSelector pkind, Type pt, CheckMode checkMode) {
513 this(pkind, pt, chk.basicHandler, checkMode);
514 }
515
516 protected ResultInfo(KindSelector pkind,
517 Type pt, CheckContext checkContext) {
518 this(pkind, pt, checkContext, CheckMode.NORMAL);
519 }
520
521 protected ResultInfo(KindSelector pkind,
522 Type pt, CheckContext checkContext, CheckMode checkMode) {
523 this.pkind = pkind;
524 this.pt = pt;
525 this.checkContext = checkContext;
526 this.checkMode = checkMode;
527 }
528
529 /**
530 * Should {@link Attr#attribTree} use the {@code ArgumentAttr} visitor instead of this one?
531 * @param tree The tree to be type-checked.
532 * @return true if {@code ArgumentAttr} should be used.
533 */
534 protected boolean needsArgumentAttr(JCTree tree) { return false; }
535
536 protected Type check(final DiagnosticPosition pos, final Type found) {
537 return chk.checkType(pos, found, pt, checkContext);
538 }
539
540 protected ResultInfo dup(Type newPt) {
541 return new ResultInfo(pkind, newPt, checkContext, checkMode);
542 }
543
544 protected ResultInfo dup(CheckContext newContext) {
545 return new ResultInfo(pkind, pt, newContext, checkMode);
546 }
547
548 protected ResultInfo dup(Type newPt, CheckContext newContext) {
549 return new ResultInfo(pkind, newPt, newContext, checkMode);
550 }
551
552 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) {
553 return new ResultInfo(pkind, newPt, newContext, newMode);
554 }
555
556 protected ResultInfo dup(CheckMode newMode) {
557 return new ResultInfo(pkind, pt, checkContext, newMode);
558 }
559
560 @Override
561 public String toString() {
562 if (pt != null) {
563 return pt.toString();
564 } else {
565 return "";
566 }
567 }
568 }
569
570 class MethodAttrInfo extends ResultInfo {
571 public MethodAttrInfo() {
572 this(chk.basicHandler);
573 }
574
575 public MethodAttrInfo(CheckContext checkContext) {
576 super(KindSelector.VAL, Infer.anyPoly, checkContext);
577 }
578
579 @Override
580 protected boolean needsArgumentAttr(JCTree tree) {
581 return true;
582 }
583
584 protected ResultInfo dup(Type newPt) {
585 throw new IllegalStateException();
586 }
587
588 protected ResultInfo dup(CheckContext newContext) {
589 return new MethodAttrInfo(newContext);
590 }
591
592 protected ResultInfo dup(Type newPt, CheckContext newContext) {
593 throw new IllegalStateException();
594 }
595
596 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) {
597 throw new IllegalStateException();
598 }
599
600 protected ResultInfo dup(CheckMode newMode) {
601 throw new IllegalStateException();
602 }
603 }
604
605 class RecoveryInfo extends ResultInfo {
606
607 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext) {
608 this(deferredAttrContext, Type.recoveryType);
609 }
610
611 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext, Type pt) {
612 super(KindSelector.VAL, pt, new Check.NestedCheckContext(chk.basicHandler) {
613 @Override
614 public DeferredAttr.DeferredAttrContext deferredAttrContext() {
615 return deferredAttrContext;
616 }
617 @Override
618 public boolean compatible(Type found, Type req, Warner warn) {
619 return true;
620 }
621 @Override
622 public void report(DiagnosticPosition pos, JCDiagnostic details) {
623 boolean needsReport = pt == Type.recoveryType ||
624 (details.getDiagnosticPosition() != null &&
625 details.getDiagnosticPosition().getTree().hasTag(LAMBDA));
626 if (needsReport) {
627 chk.basicHandler.report(pos, details);
628 }
629 }
630 });
631 }
632 }
633
634 final ResultInfo statInfo;
635 final ResultInfo varAssignmentInfo;
636 final ResultInfo varAssignmentOpInfo;
637 final ResultInfo methodAttrInfo;
638 final ResultInfo unknownExprInfo;
639 final ResultInfo unknownTypeInfo;
640 final ResultInfo unknownTypeExprInfo;
641 final ResultInfo recoveryInfo;
642 final MethodType initBlockType;
643
644 Type pt() {
645 return resultInfo.pt;
646 }
647
648 KindSelector pkind() {
649 return resultInfo.pkind;
650 }
651
652 /* ************************************************************************
653 * Visitor methods
654 *************************************************************************/
655
656 /** Visitor argument: the current environment.
657 */
658 Env<AttrContext> env;
659
660 /** Visitor argument: the currently expected attribution result.
661 */
662 ResultInfo resultInfo;
663
664 /** Visitor result: the computed type.
665 */
666 Type result;
667
668 MatchBindings matchBindings = MatchBindingsComputer.EMPTY;
669
670 /** Visitor method: attribute a tree, catching any completion failure
671 * exceptions. Return the tree's type.
672 *
673 * @param tree The tree to be visited.
674 * @param env The environment visitor argument.
675 * @param resultInfo The result info visitor argument.
676 */
677 Type attribTree(JCTree tree, Env<AttrContext> env, ResultInfo resultInfo) {
678 Env<AttrContext> prevEnv = this.env;
679 ResultInfo prevResult = this.resultInfo;
680 try {
681 this.env = env;
682 this.resultInfo = resultInfo;
683 if (resultInfo.needsArgumentAttr(tree)) {
684 result = argumentAttr.attribArg(tree, env);
685 } else {
686 tree.accept(this);
687 }
688 matchBindings = matchBindingsComputer.finishBindings(tree,
689 matchBindings);
690 checkBreakTree(tree, env);
691 return result;
692 } catch (CompletionFailure ex) {
693 tree.type = syms.errType;
694 return chk.completionError(tree.pos(), ex);
695 } finally {
696 this.env = prevEnv;
697 this.resultInfo = prevResult;
698 }
699 }
700
701 private void checkBreakTree(JCTree tree, Env<AttrContext> env) {
702 if (tree == breakTree &&
703 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
704 breakTreeFound(copyEnv(env));
705 }
706 }
707
708 protected void breakTreeFound(Env<AttrContext> env) {
709 throw new BreakAttr(env);
710 }
711
712 Env<AttrContext> copyEnv(Env<AttrContext> env) {
713 Env<AttrContext> newEnv =
714 env.dup(env.tree, env.info.dup(copyScope(env.info.scope)));
715 if (newEnv.outer != null) {
716 newEnv.outer = copyEnv(newEnv.outer);
717 }
718 return newEnv;
719 }
720
721 WriteableScope copyScope(WriteableScope sc) {
722 WriteableScope newScope = WriteableScope.create(sc.owner);
723 List<Symbol> elemsList = List.nil();
724 for (Symbol sym : sc.getSymbols()) {
725 elemsList = elemsList.prepend(sym);
726 }
727 for (Symbol s : elemsList) {
728 newScope.enter(s);
729 }
730 return newScope;
731 }
732
733 /** Derived visitor method: attribute an expression tree.
734 */
735 public Type attribExpr(JCTree tree, Env<AttrContext> env, Type pt) {
736 return attribTree(tree, env, new ResultInfo(KindSelector.VAL, !pt.hasTag(ERROR) ? pt : Type.noType));
737 }
738
739 /** Derived visitor method: attribute an expression tree with
740 * no constraints on the computed type.
741 */
742 public Type attribExpr(JCTree tree, Env<AttrContext> env) {
743 return attribTree(tree, env, unknownExprInfo);
744 }
745
746 /** Derived visitor method: attribute a type tree.
747 */
748 public Type attribType(JCTree tree, Env<AttrContext> env) {
749 Type result = attribType(tree, env, Type.noType);
750 return result;
751 }
752
753 /** Derived visitor method: attribute a type tree.
754 */
755 Type attribType(JCTree tree, Env<AttrContext> env, Type pt) {
756 Type result = attribTree(tree, env, new ResultInfo(KindSelector.TYP, pt));
757 return result;
758 }
759
760 /** Derived visitor method: attribute a statement or definition tree.
761 */
762 public Type attribStat(JCTree tree, Env<AttrContext> env) {
763 Env<AttrContext> analyzeEnv = analyzer.copyEnvIfNeeded(tree, env);
764 Type result = attribTree(tree, env, statInfo);
765 analyzer.analyzeIfNeeded(tree, analyzeEnv);
766 attrRecover.doRecovery();
767 return result;
768 }
769
770 /** Attribute a list of expressions, returning a list of types.
771 */
772 List<Type> attribExprs(List<JCExpression> trees, Env<AttrContext> env, Type pt) {
773 ListBuffer<Type> ts = new ListBuffer<>();
774 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
775 ts.append(attribExpr(l.head, env, pt));
776 return ts.toList();
777 }
778
779 /** Attribute a list of statements, returning nothing.
780 */
781 <T extends JCTree> void attribStats(List<T> trees, Env<AttrContext> env) {
782 for (List<T> l = trees; l.nonEmpty(); l = l.tail)
783 attribStat(l.head, env);
784 }
785
786 /** Attribute the arguments in a method call, returning the method kind.
787 */
788 KindSelector attribArgs(KindSelector initialKind, List<JCExpression> trees, Env<AttrContext> env, ListBuffer<Type> argtypes) {
789 KindSelector kind = initialKind;
790 for (JCExpression arg : trees) {
791 Type argtype = chk.checkNonVoid(arg, attribTree(arg, env, methodAttrInfo));
792 if (argtype.hasTag(DEFERRED)) {
793 kind = KindSelector.of(KindSelector.POLY, kind);
794 }
795 argtypes.append(argtype);
796 }
797 return kind;
798 }
799
800 /** Attribute a type argument list, returning a list of types.
801 * Caller is responsible for calling checkRefTypes.
802 */
803 List<Type> attribAnyTypes(List<JCExpression> trees, Env<AttrContext> env) {
804 ListBuffer<Type> argtypes = new ListBuffer<>();
805 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
806 argtypes.append(attribType(l.head, env));
807 return argtypes.toList();
808 }
809
810 /** Attribute a type argument list, returning a list of types.
811 * Check that all the types are references.
812 */
813 List<Type> attribTypes(List<JCExpression> trees, Env<AttrContext> env) {
814 List<Type> types = attribAnyTypes(trees, env);
815 return chk.checkRefTypes(trees, types);
816 }
817
818 /**
819 * Attribute type variables (of generic classes or methods).
820 * Compound types are attributed later in attribBounds.
821 * @param typarams the type variables to enter
822 * @param env the current environment
823 */
824 void attribTypeVariables(List<JCTypeParameter> typarams, Env<AttrContext> env, boolean checkCyclic) {
825 for (JCTypeParameter tvar : typarams) {
826 TypeVar a = (TypeVar)tvar.type;
827 a.tsym.flags_field |= UNATTRIBUTED;
828 a.setUpperBound(Type.noType);
829 if (!tvar.bounds.isEmpty()) {
830 List<Type> bounds = List.of(attribType(tvar.bounds.head, env));
831 for (JCExpression bound : tvar.bounds.tail)
832 bounds = bounds.prepend(attribType(bound, env));
833 types.setBounds(a, bounds.reverse());
834 } else {
835 // if no bounds are given, assume a single bound of
836 // java.lang.Object.
837 types.setBounds(a, List.of(syms.objectType));
838 }
839 a.tsym.flags_field &= ~UNATTRIBUTED;
840 }
841 if (checkCyclic) {
842 for (JCTypeParameter tvar : typarams) {
843 chk.checkNonCyclic(tvar.pos(), (TypeVar)tvar.type);
844 }
845 }
846 }
847
848 /**
849 * Attribute the type references in a list of annotations.
850 */
851 void attribAnnotationTypes(List<JCAnnotation> annotations,
852 Env<AttrContext> env) {
853 for (List<JCAnnotation> al = annotations; al.nonEmpty(); al = al.tail) {
854 JCAnnotation a = al.head;
855 attribType(a.annotationType, env);
856 }
857 }
858
859 /**
860 * Attribute a "lazy constant value".
861 * @param env The env for the const value
862 * @param variable The initializer for the const value
863 * @param type The expected type, or null
864 * @see VarSymbol#setLazyConstValue
865 */
866 public Object attribLazyConstantValue(Env<AttrContext> env,
867 Env<AttrContext> enclosingEnv,
868 JCVariableDecl variable,
869 Type type) {
870 final JavaFileObject prevSource = log.useSource(env.toplevel.sourcefile);
871 try {
872 doQueueScanTreeAndTypeAnnotateForVarInit(variable, enclosingEnv);
873 Type itype = attribExpr(variable.init, env, type);
874 if (variable.isImplicitlyTyped()) {
875 //fixup local variable type
876 type = variable.type = variable.sym.type = chk.checkLocalVarType(variable, itype, variable.name);
877 }
878 if (itype.constValue() != null) {
879 return coerce(itype, type).constValue();
880 } else {
881 return null;
882 }
883 } finally {
884 log.useSource(prevSource);
885 }
886 }
887
888 /** Attribute type reference in an `extends', `implements', or 'permits' clause.
889 * Supertypes of anonymous inner classes are usually already attributed.
890 *
891 * @param tree The tree making up the type reference.
892 * @param env The environment current at the reference.
893 * @param classExpected true if only a class is expected here.
894 * @param interfaceExpected true if only an interface is expected here.
895 */
896 Type attribBase(JCTree tree,
897 Env<AttrContext> env,
898 boolean classExpected,
899 boolean interfaceExpected,
900 boolean checkExtensible) {
901 Type t = tree.type != null ?
902 tree.type :
903 attribType(tree, env);
904 try {
905 return tree.type = checkBase(t, tree, env, classExpected, interfaceExpected, checkExtensible);
906 } catch (CompletionFailure ex) {
907 chk.completionError(tree.pos(), ex);
908 return t;
909 }
910 }
911 Type checkBase(Type t,
912 JCTree tree,
913 Env<AttrContext> env,
914 boolean classExpected,
915 boolean interfaceExpected,
916 boolean checkExtensible) {
917 final DiagnosticPosition pos = tree.hasTag(TYPEAPPLY) ?
918 (((JCTypeApply) tree).clazz).pos() : tree.pos();
919 if (t.tsym.isAnonymous()) {
920 log.error(pos, Errors.CantInheritFromAnon);
921 return types.createErrorType(t);
922 }
923 if (t.isErroneous())
924 return t;
925 if (t.hasTag(TYPEVAR) && !classExpected && !interfaceExpected) {
926 // check that type variable is already visible
927 if (t.getUpperBound() == null) {
928 log.error(pos, Errors.IllegalForwardRef);
929 return types.createErrorType(t);
930 }
931 } else {
932 t = chk.checkClassType(pos, t, checkExtensible);
933 }
934 if (interfaceExpected && (t.tsym.flags() & INTERFACE) == 0) {
935 log.error(pos, Errors.IntfExpectedHere);
936 // return errType is necessary since otherwise there might
937 // be undetected cycles which cause attribution to loop
938 return types.createErrorType(t);
939 } else if (checkExtensible &&
940 classExpected &&
941 (t.tsym.flags() & INTERFACE) != 0) {
942 log.error(pos, Errors.NoIntfExpectedHere);
943 return types.createErrorType(t);
944 }
945 if (checkExtensible &&
946 ((t.tsym.flags() & FINAL) != 0)) {
947 log.error(pos,
948 Errors.CantInheritFromFinal(t.tsym));
949 }
950 chk.checkNonCyclic(pos, t);
951 return t;
952 }
953
954 Type attribIdentAsEnumType(Env<AttrContext> env, JCIdent id) {
955 Assert.check((env.enclClass.sym.flags() & ENUM) != 0);
956 id.type = env.info.scope.owner.enclClass().type;
957 id.sym = env.info.scope.owner.enclClass();
958 return id.type;
959 }
960
961 public void visitClassDef(JCClassDecl tree) {
962 Optional<ArgumentAttr.LocalCacheContext> localCacheContext =
963 Optional.ofNullable(env.info.attributionMode.isSpeculative ?
964 argumentAttr.withLocalCacheContext() : null);
965 EarlyConstructionContext earlyConstructionPrev = env.info.earlyContext;
966 try {
967 env.info.earlyContext = earlyConstructionPrev.nested(true);
968 // Local and anonymous classes have not been entered yet, so we need to
969 // do it now.
970 if (env.info.scope.owner.kind.matches(KindSelector.VAL_MTH)) {
971 enter.classEnter(tree, env);
972 } else {
973 // If this class declaration is part of a class level annotation,
974 // as in @MyAnno(new Object() {}) class MyClass {}, enter it in
975 // order to simplify later steps and allow for sensible error
976 // messages.
977 if (env.tree.hasTag(NEWCLASS) && TreeInfo.isInAnnotation(env, tree))
978 enter.classEnter(tree, env);
979 }
980
981 ClassSymbol c = tree.sym;
982 if (c == null) {
983 // exit in case something drastic went wrong during enter.
984 result = null;
985 } else {
986 // make sure class has been completed:
987 c.complete();
988
989 // If a class declaration appears in a constructor prologue,
990 // that means it's either a local class or an anonymous class.
991 // Either way, there is no immediately enclosing instance.
992 if (earlyConstructionPrev.ctorPrologue()) {
993 c.flags_field |= NOOUTERTHIS;
994 }
995 attribClass(tree.pos(), c);
996 result = tree.type = c.type;
997 }
998 } finally {
999 localCacheContext.ifPresent(LocalCacheContext::leave);
1000 env.info.earlyContext = earlyConstructionPrev;
1001 }
1002 }
1003
1004 public void visitMethodDef(JCMethodDecl tree) {
1005 MethodSymbol m = tree.sym;
1006 boolean isDefaultMethod = (m.flags() & DEFAULT) != 0;
1007
1008 Lint lint = env.info.lint.augment(m);
1009 Lint prevLint = chk.setLint(lint);
1010 EarlyConstructionContext earlyConstructionPrev = env.info.earlyContext;
1011 Assert.check(!earlyConstructionPrev.ctorPrologue());
1012 MethodSymbol prevMethod = chk.setMethod(m);
1013 try {
1014 chk.checkDeprecatedAnnotation(tree.pos(), m);
1015
1016
1017 // Create a new environment with local scope
1018 // for attributing the method.
1019 Env<AttrContext> localEnv = memberEnter.methodEnv(tree, env);
1020 localEnv.info.lint = lint;
1021
1022 attribStats(tree.typarams, localEnv);
1023
1024 // If we override any other methods, check that we do so properly.
1025 // JLS ???
1026 if (m.isStatic()) {
1027 chk.checkHideClashes(tree.pos(), env.enclClass.type, m);
1028 } else {
1029 chk.checkOverrideClashes(tree.pos(), env.enclClass.type, m);
1030 }
1031 chk.checkOverride(env, tree, m);
1032
1033 if (isDefaultMethod && types.overridesObjectMethod(m.enclClass(), m)) {
1034 log.error(tree, Errors.DefaultOverridesObjectMember(m.name, Kinds.kindName(m.location()), m.location()));
1035 }
1036
1037 // Enter all type parameters into the local method scope.
1038 for (List<JCTypeParameter> l = tree.typarams; l.nonEmpty(); l = l.tail)
1039 localEnv.info.scope.enterIfAbsent(l.head.type.tsym);
1040
1041 ClassSymbol owner = env.enclClass.sym;
1042 if ((owner.flags() & ANNOTATION) != 0 &&
1043 (tree.params.nonEmpty() ||
1044 tree.recvparam != null))
1045 log.error(tree.params.nonEmpty() ?
1046 tree.params.head.pos() :
1047 tree.recvparam.pos(),
1048 Errors.IntfAnnotationMembersCantHaveParams);
1049
1050 // Attribute all value parameters.
1051 for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) {
1052 attribStat(l.head, localEnv);
1053 }
1054
1055 chk.checkVarargsMethodDecl(localEnv, tree);
1056
1057 // Check that type parameters are well-formed.
1058 chk.validate(tree.typarams, localEnv);
1059
1060 // Check that result type is well-formed.
1061 if (tree.restype != null && !tree.restype.type.hasTag(VOID)) {
1062 chk.validate(tree.restype, localEnv);
1063 }
1064 chk.checkRequiresIdentity(tree, env.info.lint);
1065
1066 // Check that receiver type is well-formed.
1067 if (tree.recvparam != null) {
1068 // Use a new environment to check the receiver parameter.
1069 // Otherwise I get "might not have been initialized" errors.
1070 // Is there a better way?
1071 Env<AttrContext> newEnv = memberEnter.methodEnv(tree, env);
1072 attribType(tree.recvparam, newEnv);
1073 chk.validate(tree.recvparam, newEnv);
1074 }
1075
1076 // Is this method a constructor?
1077 boolean isConstructor = TreeInfo.isConstructor(tree);
1078
1079 if (env.enclClass.sym.isRecord() && tree.sym.owner.kind == TYP) {
1080 // lets find if this method is an accessor
1081 Optional<? extends RecordComponent> recordComponent = env.enclClass.sym.getRecordComponents().stream()
1082 .filter(rc -> rc.accessor == tree.sym && (rc.accessor.flags_field & GENERATED_MEMBER) == 0).findFirst();
1083 if (recordComponent.isPresent()) {
1084 // the method is a user defined accessor lets check that everything is fine
1085 if (!tree.sym.isPublic()) {
1086 log.error(tree, Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.MethodMustBePublic));
1087 }
1088 if (!types.isSameType(tree.sym.type.getReturnType(), recordComponent.get().type)) {
1089 log.error(tree, Errors.InvalidAccessorMethodInRecord(env.enclClass.sym,
1090 Fragments.AccessorReturnTypeDoesntMatch(tree.sym, recordComponent.get())));
1091 }
1092 if (tree.sym.type.asMethodType().thrown != null && !tree.sym.type.asMethodType().thrown.isEmpty()) {
1093 log.error(tree,
1094 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodCantThrowException));
1095 }
1096 if (!tree.typarams.isEmpty()) {
1097 log.error(tree,
1098 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodMustNotBeGeneric));
1099 }
1100 if (tree.sym.isStatic()) {
1101 log.error(tree,
1102 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodMustNotBeStatic));
1103 }
1104 }
1105
1106 if (isConstructor) {
1107 // if this a constructor other than the canonical one
1108 if ((tree.sym.flags_field & RECORD) == 0) {
1109 if (!TreeInfo.hasConstructorCall(tree, names._this)) {
1110 log.error(tree, Errors.NonCanonicalConstructorInvokeAnotherConstructor(env.enclClass.sym));
1111 }
1112 } else {
1113 // but if it is the canonical:
1114
1115 /* if user generated, then it shouldn't:
1116 * - have an accessibility stricter than that of the record type
1117 * - explicitly invoke any other constructor
1118 */
1119 if ((tree.sym.flags_field & GENERATEDCONSTR) == 0) {
1120 if (Check.protection(m.flags()) > Check.protection(env.enclClass.sym.flags())) {
1121 log.error(tree,
1122 (env.enclClass.sym.flags() & AccessFlags) == 0 ?
1123 Errors.InvalidCanonicalConstructorInRecord(
1124 Fragments.Canonical,
1125 env.enclClass.sym.name,
1126 Fragments.CanonicalMustNotHaveStrongerAccess("package")
1127 ) :
1128 Errors.InvalidCanonicalConstructorInRecord(
1129 Fragments.Canonical,
1130 env.enclClass.sym.name,
1131 Fragments.CanonicalMustNotHaveStrongerAccess(asFlagSet(env.enclClass.sym.flags() & AccessFlags))
1132 )
1133 );
1134 }
1135
1136 if ((!allowValueClasses || TreeInfo.isCompactConstructor(tree)) &&
1137 TreeInfo.hasAnyConstructorCall(tree)) {
1138 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1139 Fragments.Canonical, env.enclClass.sym.name,
1140 Fragments.CanonicalMustNotContainExplicitConstructorInvocation));
1141 }
1142 }
1143
1144 // also we want to check that no type variables have been defined
1145 if (!tree.typarams.isEmpty()) {
1146 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1147 Fragments.Canonical, env.enclClass.sym.name, Fragments.CanonicalMustNotDeclareTypeVariables));
1148 }
1149
1150 /* and now we need to check that the constructor's arguments are exactly the same as those of the
1151 * record components
1152 */
1153 List<? extends RecordComponent> recordComponents = env.enclClass.sym.getRecordComponents();
1154 List<Type> recordFieldTypes = TreeInfo.recordFields(env.enclClass).map(vd -> vd.sym.type);
1155 for (JCVariableDecl param: tree.params) {
1156 boolean paramIsVarArgs = (param.sym.flags_field & VARARGS) != 0;
1157 if (!types.isSameType(param.type, recordFieldTypes.head) ||
1158 (recordComponents.head.isVarargs() != paramIsVarArgs)) {
1159 log.error(param, Errors.InvalidCanonicalConstructorInRecord(
1160 Fragments.Canonical, env.enclClass.sym.name,
1161 Fragments.TypeMustBeIdenticalToCorrespondingRecordComponentType));
1162 }
1163 recordComponents = recordComponents.tail;
1164 recordFieldTypes = recordFieldTypes.tail;
1165 }
1166 }
1167 }
1168 }
1169
1170 // annotation method checks
1171 if ((owner.flags() & ANNOTATION) != 0) {
1172 // annotation method cannot have throws clause
1173 if (tree.thrown.nonEmpty()) {
1174 log.error(tree.thrown.head.pos(),
1175 Errors.ThrowsNotAllowedInIntfAnnotation);
1176 }
1177 // annotation method cannot declare type-parameters
1178 if (tree.typarams.nonEmpty()) {
1179 log.error(tree.typarams.head.pos(),
1180 Errors.IntfAnnotationMembersCantHaveTypeParams);
1181 }
1182 // validate annotation method's return type (could be an annotation type)
1183 chk.validateAnnotationType(tree.restype);
1184 // ensure that annotation method does not clash with members of Object/Annotation
1185 chk.validateAnnotationMethod(tree.pos(), m);
1186 }
1187
1188 for (List<JCExpression> l = tree.thrown; l.nonEmpty(); l = l.tail)
1189 chk.checkType(l.head.pos(), l.head.type, syms.throwableType);
1190
1191 if (tree.body == null) {
1192 // Empty bodies are only allowed for
1193 // abstract, native, or interface methods, or for methods
1194 // in a retrofit signature class.
1195 if (tree.defaultValue != null) {
1196 if ((owner.flags() & ANNOTATION) == 0)
1197 log.error(tree.pos(),
1198 Errors.DefaultAllowedInIntfAnnotationMember);
1199 }
1200 if (isDefaultMethod || (tree.sym.flags() & (ABSTRACT | NATIVE)) == 0)
1201 log.error(tree.pos(), Errors.MissingMethBodyOrDeclAbstract(tree.sym, owner));
1202 } else {
1203 if ((tree.sym.flags() & (ABSTRACT|DEFAULT|PRIVATE)) == ABSTRACT) {
1204 if ((owner.flags() & INTERFACE) != 0) {
1205 log.error(tree.body.pos(), Errors.IntfMethCantHaveBody);
1206 } else {
1207 log.error(tree.pos(), Errors.AbstractMethCantHaveBody);
1208 }
1209 } else if ((tree.mods.flags & NATIVE) != 0) {
1210 log.error(tree.pos(), Errors.NativeMethCantHaveBody);
1211 }
1212 // Add an implicit super() call unless an explicit call to
1213 // super(...) or this(...) is given
1214 // or we are compiling class java.lang.Object.
1215 if (isConstructor && owner.type != syms.objectType) {
1216 if (!TreeInfo.hasAnyConstructorCall(tree)) {
1217 JCStatement supCall = make.at(tree.body.pos).Exec(make.Apply(List.nil(),
1218 make.Ident(names._super), make.Idents(List.nil())));
1219 if (allowValueClasses && (owner.isValueClass() || owner.isRecord())) {
1220 tree.body.stats = tree.body.stats.append(supCall);
1221 } else {
1222 tree.body.stats = tree.body.stats.prepend(supCall);
1223 }
1224 } else if ((env.enclClass.sym.flags() & ENUM) != 0 &&
1225 (tree.mods.flags & GENERATEDCONSTR) == 0 &&
1226 TreeInfo.hasConstructorCall(tree, names._super)) {
1227 // enum constructors are not allowed to call super
1228 // directly, so make sure there aren't any super calls
1229 // in enum constructors, except in the compiler
1230 // generated one.
1231 log.error(tree.body.stats.head.pos(),
1232 Errors.CallToSuperNotAllowedInEnumCtor(env.enclClass.sym));
1233 }
1234 if (env.enclClass.sym.isRecord() && (tree.sym.flags_field & RECORD) != 0) { // we are seeing the canonical constructor
1235 List<Name> recordComponentNames = TreeInfo.recordFields(env.enclClass).map(vd -> vd.sym.name);
1236 List<Name> initParamNames = tree.sym.params.map(p -> p.name);
1237 if (!initParamNames.equals(recordComponentNames)) {
1238 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1239 Fragments.Canonical, env.enclClass.sym.name, Fragments.CanonicalWithNameMismatch));
1240 }
1241 if (tree.sym.type.asMethodType().thrown != null && !tree.sym.type.asMethodType().thrown.isEmpty()) {
1242 log.error(tree,
1243 Errors.InvalidCanonicalConstructorInRecord(
1244 TreeInfo.isCompactConstructor(tree) ? Fragments.Compact : Fragments.Canonical,
1245 env.enclClass.sym.name,
1246 Fragments.ThrowsClauseNotAllowedForCanonicalConstructor(
1247 TreeInfo.isCompactConstructor(tree) ? Fragments.Compact : Fragments.Canonical)));
1248 }
1249 }
1250 }
1251
1252 // Attribute all type annotations in the body
1253 annotate.queueScanTreeAndTypeAnnotate(tree.body, localEnv, m);
1254 annotate.flush();
1255
1256 // Start of constructor prologue (if not in java.lang.Object constructor)
1257 if (isConstructor && owner.type != syms.objectType) {
1258 boolean hasThisConstructorCall = TreeInfo.hasConstructorCall(tree, names._this);
1259 localEnv.info.earlyContext = EarlyConstructionContext.of(owner,
1260 hasThisConstructorCall && allowValueClasses);
1261 }
1262
1263 // Attribute method body.
1264 attribStat(tree.body, localEnv);
1265 }
1266
1267 localEnv.info.scope.leave();
1268 result = tree.type = m.type;
1269 } finally {
1270 chk.setLint(prevLint);
1271 chk.setMethod(prevMethod);
1272 env.info.earlyContext = earlyConstructionPrev;
1273 }
1274 }
1275
1276 public void visitVarDef(JCVariableDecl tree) {
1277 // Local variables have not been entered yet, so we need to do it now:
1278 if (env.info.scope.owner.kind == MTH || env.info.scope.owner.kind == VAR) {
1279 if (tree.sym != null) {
1280 // parameters have already been entered
1281 env.info.scope.enter(tree.sym);
1282 } else {
1283 if (tree.isImplicitlyTyped() && (tree.getModifiers().flags & PARAMETER) == 0 && tree.type == null) {
1284 if (tree.init == null) {
1285 //cannot use 'var' without initializer
1286 log.error(tree, Errors.CantInferLocalVarType(tree.name, Fragments.LocalMissingInit));
1287 tree.type = syms.errType;
1288 } else {
1289 Fragment msg = canInferLocalVarType(tree);
1290 if (msg != null) {
1291 //cannot use 'var' with initializer which require an explicit target
1292 //(e.g. lambda, method reference, array initializer).
1293 log.error(tree, Errors.CantInferLocalVarType(tree.name, msg));
1294 tree.type = syms.errType;
1295 }
1296 }
1297 }
1298 try {
1299 annotate.blockAnnotations();
1300 memberEnter.memberEnter(tree, env);
1301 typeAnnotations.organizeTypeAnnotationsSignaturesForLocalVarType(env, tree);
1302 } finally {
1303 annotate.unblockAnnotations();
1304 }
1305 }
1306 } else {
1307 doQueueScanTreeAndTypeAnnotateForVarInit(tree, env);
1308 }
1309
1310 VarSymbol v = tree.sym;
1311 Lint lint = env.info.lint.augment(v);
1312 Lint prevLint = chk.setLint(lint);
1313
1314 // Check that the variable's declared type is well-formed.
1315 boolean isImplicitLambdaParameter = env.tree.hasTag(LAMBDA) &&
1316 ((JCLambda)env.tree).paramKind == JCLambda.ParameterKind.IMPLICIT &&
1317 (tree.sym.flags() & PARAMETER) != 0;
1318 chk.validate(tree.vartype, env, !isImplicitLambdaParameter && !tree.isImplicitlyTyped());
1319
1320 try {
1321 v.getConstValue(); // ensure compile-time constant initializer is evaluated
1322 chk.checkDeprecatedAnnotation(tree.pos(), v);
1323
1324 if (tree.init != null) {
1325 if ((v.flags_field & FINAL) == 0 ||
1326 !memberEnter.needsLazyConstValue(tree.init)) {
1327 // Not a compile-time constant
1328 // Attribute initializer in a new environment
1329 // with the declared variable as owner.
1330 // Check that initializer conforms to variable's declared type.
1331 Env<AttrContext> initEnv = memberEnter.initEnv(tree, env);
1332 initEnv.info.lint = lint;
1333 // In order to catch self-references, we set the variable's
1334 // declaration position to maximal possible value, effectively
1335 // marking the variable as undefined.
1336 initEnv.info.enclVar = v;
1337 EarlyConstructionContext previousEarlyConstruction = initEnv.info.earlyContext;
1338 try {
1339 if (v.isStrictInstance() && allowValueClasses) {
1340 // instance strict field init occur in early construction context
1341 initEnv.info.earlyContext = EarlyConstructionContext.of((ClassSymbol)v.owner, false);
1342 }
1343 attribExpr(tree.init, initEnv, v.type);
1344 if (tree.isImplicitlyTyped()) {
1345 //fixup local variable type
1346 v.type = chk.checkLocalVarType(tree, tree.init.type, tree.name);
1347 }
1348 } finally {
1349 initEnv.info.earlyContext = previousEarlyConstruction;
1350 }
1351 }
1352 if (tree.isImplicitlyTyped()) {
1353 setupImplicitlyTypedVariable(tree, v.type);
1354 }
1355 }
1356 result = tree.type = v.type;
1357 if (env.enclClass.sym.isRecord() && tree.sym.owner.kind == TYP && !v.isStatic()) {
1358 if (isNonArgsMethodInObject(v.name)) {
1359 log.error(tree, Errors.IllegalRecordComponentName(v));
1360 }
1361 }
1362 chk.checkRequiresIdentity(tree, env.info.lint);
1363 }
1364 finally {
1365 chk.setLint(prevLint);
1366 }
1367 }
1368
1369 private void doQueueScanTreeAndTypeAnnotateForVarInit(JCVariableDecl tree, Env<AttrContext> env) {
1370 if (tree.init != null &&
1371 (tree.sym.flags_field & Flags.FIELD_INIT_TYPE_ANNOTATIONS_QUEUED) == 0 &&
1372 env.info.scope.owner.kind != MTH && env.info.scope.owner.kind != VAR) {
1373 tree.sym.flags_field |= Flags.FIELD_INIT_TYPE_ANNOTATIONS_QUEUED;
1374 // Field initializer expression need to be entered.
1375 annotate.queueScanTreeAndTypeAnnotate(tree.init, env, tree.sym);
1376 annotate.flush();
1377 }
1378 }
1379
1380 private boolean isNonArgsMethodInObject(Name name) {
1381 for (Symbol s : syms.objectType.tsym.members().getSymbolsByName(name, s -> s.kind == MTH)) {
1382 if (s.type.getParameterTypes().isEmpty()) {
1383 return true;
1384 }
1385 }
1386 return false;
1387 }
1388
1389 Fragment canInferLocalVarType(JCVariableDecl tree) {
1390 LocalInitScanner lis = new LocalInitScanner();
1391 lis.scan(tree.init);
1392 return lis.badInferenceMsg;
1393 }
1394
1395 static class LocalInitScanner extends TreeScanner {
1396 Fragment badInferenceMsg = null;
1397 boolean needsTarget = true;
1398
1399 @Override
1400 public void visitNewArray(JCNewArray tree) {
1401 if (tree.elemtype == null && needsTarget) {
1402 badInferenceMsg = Fragments.LocalArrayMissingTarget;
1403 }
1404 }
1405
1406 @Override
1407 public void visitLambda(JCLambda tree) {
1408 if (needsTarget) {
1409 badInferenceMsg = Fragments.LocalLambdaMissingTarget;
1410 }
1411 }
1412
1413 @Override
1414 public void visitTypeCast(JCTypeCast tree) {
1415 boolean prevNeedsTarget = needsTarget;
1416 try {
1417 needsTarget = false;
1418 super.visitTypeCast(tree);
1419 } finally {
1420 needsTarget = prevNeedsTarget;
1421 }
1422 }
1423
1424 @Override
1425 public void visitReference(JCMemberReference tree) {
1426 if (needsTarget) {
1427 badInferenceMsg = Fragments.LocalMrefMissingTarget;
1428 }
1429 }
1430
1431 @Override
1432 public void visitNewClass(JCNewClass tree) {
1433 boolean prevNeedsTarget = needsTarget;
1434 try {
1435 needsTarget = false;
1436 super.visitNewClass(tree);
1437 } finally {
1438 needsTarget = prevNeedsTarget;
1439 }
1440 }
1441
1442 @Override
1443 public void visitApply(JCMethodInvocation tree) {
1444 boolean prevNeedsTarget = needsTarget;
1445 try {
1446 needsTarget = false;
1447 super.visitApply(tree);
1448 } finally {
1449 needsTarget = prevNeedsTarget;
1450 }
1451 }
1452 }
1453
1454 public void visitSkip(JCSkip tree) {
1455 result = null;
1456 }
1457
1458 public void visitBlock(JCBlock tree) {
1459 if (env.info.scope.owner.kind == TYP || env.info.scope.owner.kind == ERR) {
1460 // Block is a static or instance initializer;
1461 // let the owner of the environment be a freshly
1462 // created BLOCK-method.
1463 Symbol fakeOwner =
1464 new MethodSymbol(tree.flags | BLOCK |
1465 env.info.scope.owner.flags() & STRICTFP, names.empty, initBlockType,
1466 env.info.scope.owner);
1467 final Env<AttrContext> localEnv =
1468 env.dup(tree, env.info.dup(env.info.scope.dupUnshared(fakeOwner)));
1469
1470 if ((tree.flags & STATIC) != 0) localEnv.info.staticLevel++;
1471 // Attribute all type annotations in the block
1472 annotate.queueScanTreeAndTypeAnnotate(tree, localEnv, localEnv.info.scope.owner);
1473 annotate.flush();
1474 attribStats(tree.stats, localEnv);
1475
1476 {
1477 // Store init and clinit type annotations with the ClassSymbol
1478 // to allow output in Gen.normalizeDefs.
1479 ClassSymbol cs = (ClassSymbol)env.info.scope.owner;
1480 List<Attribute.TypeCompound> tas = localEnv.info.scope.owner.getRawTypeAttributes();
1481 if ((tree.flags & STATIC) != 0) {
1482 cs.appendClassInitTypeAttributes(tas);
1483 } else {
1484 cs.appendInitTypeAttributes(tas);
1485 }
1486 }
1487 } else {
1488 // Create a new local environment with a local scope.
1489 Env<AttrContext> localEnv =
1490 env.dup(tree, env.info.dup(env.info.scope.dup()));
1491 try {
1492 attribStats(tree.stats, localEnv);
1493 } finally {
1494 localEnv.info.scope.leave();
1495 }
1496 }
1497 result = null;
1498 }
1499
1500 public void visitDoLoop(JCDoWhileLoop tree) {
1501 attribStat(tree.body, env.dup(tree));
1502 attribExpr(tree.cond, env, syms.booleanType);
1503 handleLoopConditionBindings(matchBindings, tree, tree.body);
1504 result = null;
1505 }
1506
1507 public void visitWhileLoop(JCWhileLoop tree) {
1508 attribExpr(tree.cond, env, syms.booleanType);
1509 MatchBindings condBindings = matchBindings;
1510 // include condition's bindings when true in the body:
1511 Env<AttrContext> whileEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
1512 try {
1513 attribStat(tree.body, whileEnv.dup(tree));
1514 } finally {
1515 whileEnv.info.scope.leave();
1516 }
1517 handleLoopConditionBindings(condBindings, tree, tree.body);
1518 result = null;
1519 }
1520
1521 public void visitForLoop(JCForLoop tree) {
1522 Env<AttrContext> loopEnv =
1523 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1524 MatchBindings condBindings = MatchBindingsComputer.EMPTY;
1525 try {
1526 attribStats(tree.init, loopEnv);
1527 if (tree.cond != null) {
1528 attribExpr(tree.cond, loopEnv, syms.booleanType);
1529 // include condition's bindings when true in the body and step:
1530 condBindings = matchBindings;
1531 }
1532 Env<AttrContext> bodyEnv = bindingEnv(loopEnv, condBindings.bindingsWhenTrue);
1533 try {
1534 bodyEnv.tree = tree; // before, we were not in loop!
1535 attribStats(tree.step, bodyEnv);
1536 attribStat(tree.body, bodyEnv);
1537 } finally {
1538 bodyEnv.info.scope.leave();
1539 }
1540 result = null;
1541 }
1542 finally {
1543 loopEnv.info.scope.leave();
1544 }
1545 handleLoopConditionBindings(condBindings, tree, tree.body);
1546 }
1547
1548 /**
1549 * Include condition's bindings when false after the loop, if cannot get out of the loop
1550 */
1551 private void handleLoopConditionBindings(MatchBindings condBindings,
1552 JCStatement loop,
1553 JCStatement loopBody) {
1554 if (condBindings.bindingsWhenFalse.nonEmpty() &&
1555 !breaksTo(env, loop, loopBody)) {
1556 addBindings2Scope(loop, condBindings.bindingsWhenFalse);
1557 }
1558 }
1559
1560 private boolean breaksTo(Env<AttrContext> env, JCTree loop, JCTree body) {
1561 preFlow(body);
1562 return flow.breaksToTree(env, loop, body, make);
1563 }
1564
1565 /**
1566 * Add given bindings to the current scope, unless there's a break to
1567 * an immediately enclosing labeled statement.
1568 */
1569 private void addBindings2Scope(JCStatement introducingStatement,
1570 List<BindingSymbol> bindings) {
1571 if (bindings.isEmpty()) {
1572 return ;
1573 }
1574
1575 var searchEnv = env;
1576 while (searchEnv.tree instanceof JCLabeledStatement labeled &&
1577 labeled.body == introducingStatement) {
1578 if (breaksTo(env, labeled, labeled.body)) {
1579 //breaking to an immediately enclosing labeled statement
1580 return ;
1581 }
1582 searchEnv = searchEnv.next;
1583 introducingStatement = labeled;
1584 }
1585
1586 //include condition's body when false after the while, if cannot get out of the loop
1587 bindings.forEach(env.info.scope::enter);
1588 bindings.forEach(BindingSymbol::preserveBinding);
1589 }
1590
1591 public void visitForeachLoop(JCEnhancedForLoop tree) {
1592 Env<AttrContext> loopEnv =
1593 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1594 try {
1595 //the Formal Parameter of a for-each loop is not in the scope when
1596 //attributing the for-each expression; we mimic this by attributing
1597 //the for-each expression first (against original scope).
1598 Type exprType = types.cvarUpperBound(attribExpr(tree.expr, loopEnv));
1599 chk.checkNonVoid(tree.pos(), exprType);
1600 Type elemtype = types.elemtype(exprType); // perhaps expr is an array?
1601 if (elemtype == null) {
1602 // or perhaps expr implements Iterable<T>?
1603 Type base = types.asSuper(exprType, syms.iterableType.tsym);
1604 if (base == null) {
1605 log.error(tree.expr.pos(),
1606 Errors.ForeachNotApplicableToType(exprType,
1607 Fragments.TypeReqArrayOrIterable));
1608 elemtype = types.createErrorType(exprType);
1609 } else {
1610 List<Type> iterableParams = base.allparams();
1611 elemtype = iterableParams.isEmpty()
1612 ? syms.objectType
1613 : types.wildUpperBound(iterableParams.head);
1614
1615 // Check the return type of the method iterator().
1616 // This is the bare minimum we need to verify to make sure code generation doesn't crash.
1617 Symbol iterSymbol = rs.resolveInternalMethod(tree.pos(),
1618 loopEnv, types.skipTypeVars(exprType, false), names.iterator, List.nil(), List.nil());
1619 if (types.asSuper(iterSymbol.type.getReturnType(), syms.iteratorType.tsym) == null) {
1620 log.error(tree.pos(),
1621 Errors.ForeachNotApplicableToType(exprType, Fragments.TypeReqArrayOrIterable));
1622 }
1623 }
1624 }
1625 if (tree.var.isImplicitlyTyped()) {
1626 Type inferredType = chk.checkLocalVarType(tree.var, elemtype, tree.var.name);
1627 tree.var.type = inferredType;
1628 setupImplicitlyTypedVariable(tree.var, inferredType);
1629 }
1630 attribStat(tree.var, loopEnv);
1631 chk.checkType(tree.expr.pos(), elemtype, tree.var.sym.type);
1632 loopEnv.tree = tree; // before, we were not in loop!
1633 attribStat(tree.body, loopEnv);
1634 result = null;
1635 }
1636 finally {
1637 loopEnv.info.scope.leave();
1638 }
1639 }
1640
1641 public void visitLabelled(JCLabeledStatement tree) {
1642 // Check that label is not used in an enclosing statement
1643 Env<AttrContext> env1 = env;
1644 while (env1 != null && !env1.tree.hasTag(CLASSDEF)) {
1645 if (env1.tree.hasTag(LABELLED) &&
1646 ((JCLabeledStatement) env1.tree).label == tree.label) {
1647 log.error(tree.pos(),
1648 Errors.LabelAlreadyInUse(tree.label));
1649 break;
1650 }
1651 env1 = env1.next;
1652 }
1653
1654 attribStat(tree.body, env.dup(tree));
1655 result = null;
1656 }
1657
1658 public void visitSwitch(JCSwitch tree) {
1659 handleSwitch(tree, tree.selector, tree.cases, (c, caseEnv) -> {
1660 attribStats(c.stats, caseEnv);
1661 });
1662 result = null;
1663 }
1664
1665 public void visitSwitchExpression(JCSwitchExpression tree) {
1666 boolean wrongContext = false;
1667
1668 tree.polyKind = (pt().hasTag(NONE) && pt() != Type.recoveryType && pt() != Infer.anyPoly) ?
1669 PolyKind.STANDALONE : PolyKind.POLY;
1670
1671 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) {
1672 //this means we are returning a poly conditional from void-compatible lambda expression
1673 resultInfo.checkContext.report(tree, diags.fragment(Fragments.SwitchExpressionTargetCantBeVoid));
1674 resultInfo = recoveryInfo;
1675 wrongContext = true;
1676 }
1677
1678 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ?
1679 unknownExprInfo :
1680 resultInfo.dup(switchExpressionContext(resultInfo.checkContext));
1681
1682 ListBuffer<DiagnosticPosition> caseTypePositions = new ListBuffer<>();
1683 ListBuffer<Type> caseTypes = new ListBuffer<>();
1684
1685 handleSwitch(tree, tree.selector, tree.cases, (c, caseEnv) -> {
1686 caseEnv.info.yieldResult = condInfo;
1687 attribStats(c.stats, caseEnv);
1688 new TreeScanner() {
1689 @Override
1690 public void visitYield(JCYield brk) {
1691 if (brk.target == tree) {
1692 caseTypePositions.append(brk.value != null ? brk.value.pos() : brk.pos());
1693 caseTypes.append(brk.value != null ? brk.value.type : syms.errType);
1694 }
1695 super.visitYield(brk);
1696 }
1697
1698 @Override public void visitClassDef(JCClassDecl tree) {}
1699 @Override public void visitLambda(JCLambda tree) {}
1700 }.scan(c.stats);
1701 });
1702
1703 if (tree.cases.isEmpty()) {
1704 log.error(tree.pos(),
1705 Errors.SwitchExpressionEmpty);
1706 } else if (caseTypes.isEmpty()) {
1707 log.error(tree.pos(),
1708 Errors.SwitchExpressionNoResultExpressions);
1709 }
1710
1711 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ? condType(caseTypePositions.toList(), caseTypes.toList()) : pt();
1712
1713 result = tree.type = wrongContext? types.createErrorType(pt()) : check(tree, owntype, KindSelector.VAL, resultInfo);
1714 }
1715 //where:
1716 CheckContext switchExpressionContext(CheckContext checkContext) {
1717 return new Check.NestedCheckContext(checkContext) {
1718 //this will use enclosing check context to check compatibility of
1719 //subexpression against target type; if we are in a method check context,
1720 //depending on whether boxing is allowed, we could have incompatibilities
1721 @Override
1722 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1723 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleTypeInSwitchExpression(details)));
1724 }
1725 };
1726 }
1727
1728 private void handleSwitch(JCTree switchTree,
1729 JCExpression selector,
1730 List<JCCase> cases,
1731 BiConsumer<JCCase, Env<AttrContext>> attribCase) {
1732 Type seltype = attribExpr(selector, env);
1733 Type seltypeUnboxed = types.unboxedTypeOrType(seltype);
1734
1735 Env<AttrContext> switchEnv =
1736 env.dup(switchTree, env.info.dup(env.info.scope.dup()));
1737
1738 try {
1739 boolean enumSwitch = (seltype.tsym.flags() & Flags.ENUM) != 0;
1740 boolean stringSwitch = types.isSameType(seltype, syms.stringType);
1741 boolean booleanSwitch = types.isSameType(seltypeUnboxed, syms.booleanType);
1742 boolean errorEnumSwitch = TreeInfo.isErrorEnumSwitch(selector, cases);
1743 boolean intSwitch = types.isAssignable(seltype, syms.intType);
1744 boolean patternSwitch;
1745 if (seltype.isPrimitive() && !intSwitch) {
1746 preview.checkSourceLevel(selector.pos(), Feature.PRIMITIVE_PATTERNS);
1747 patternSwitch = true;
1748 }
1749 if (!enumSwitch && !stringSwitch && !errorEnumSwitch &&
1750 !intSwitch) {
1751 preview.checkSourceLevel(selector.pos(), Feature.PATTERN_SWITCH);
1752 patternSwitch = true;
1753 } else {
1754 patternSwitch = cases.stream()
1755 .flatMap(c -> c.labels.stream())
1756 .anyMatch(l -> l.hasTag(PATTERNCASELABEL) ||
1757 TreeInfo.isNullCaseLabel(l));
1758 }
1759
1760 // Attribute all cases and
1761 // check that there are no duplicate case labels or default clauses.
1762 Set<Object> constants = new HashSet<>(); // The set of case constants.
1763 boolean hasDefault = false; // Is there a default label?
1764 boolean hasUnconditionalPattern = false; // Is there a unconditional pattern?
1765 boolean lastPatternErroneous = false; // Has the last pattern erroneous type?
1766 boolean hasNullPattern = false; // Is there a null pattern?
1767 CaseTree.CaseKind caseKind = null;
1768 boolean wasError = false;
1769 JCCaseLabel unconditionalCaseLabel = null;
1770 for (List<JCCase> l = cases; l.nonEmpty(); l = l.tail) {
1771 JCCase c = l.head;
1772 if (caseKind == null) {
1773 caseKind = c.caseKind;
1774 } else if (caseKind != c.caseKind && !wasError) {
1775 log.error(c.pos(),
1776 Errors.SwitchMixingCaseTypes);
1777 wasError = true;
1778 }
1779 MatchBindings currentBindings = null;
1780 MatchBindings guardBindings = null;
1781 for (List<JCCaseLabel> labels = c.labels; labels.nonEmpty(); labels = labels.tail) {
1782 JCCaseLabel label = labels.head;
1783 if (label instanceof JCConstantCaseLabel constLabel) {
1784 JCExpression expr = constLabel.expr;
1785 if (TreeInfo.isNull(expr)) {
1786 preview.checkSourceLevel(expr.pos(), Feature.CASE_NULL);
1787 if (hasNullPattern) {
1788 log.error(label.pos(), Errors.DuplicateCaseLabel);
1789 }
1790 hasNullPattern = true;
1791 attribExpr(expr, switchEnv, seltype);
1792 matchBindings = new MatchBindings(matchBindings.bindingsWhenTrue, matchBindings.bindingsWhenFalse, true);
1793 } else if (enumSwitch) {
1794 Symbol sym = enumConstant(expr, seltype);
1795 if (sym == null) {
1796 if (allowPatternSwitch) {
1797 attribTree(expr, switchEnv, caseLabelResultInfo(seltype));
1798 Symbol enumSym = TreeInfo.symbol(expr);
1799 if (enumSym == null || !enumSym.isEnum() || enumSym.kind != VAR) {
1800 log.error(expr.pos(), Errors.EnumLabelMustBeEnumConstant);
1801 } else if (!constants.add(enumSym)) {
1802 log.error(label.pos(), Errors.DuplicateCaseLabel);
1803 }
1804 } else {
1805 log.error(expr.pos(), Errors.EnumLabelMustBeUnqualifiedEnum);
1806 }
1807 } else if (!constants.add(sym)) {
1808 log.error(label.pos(), Errors.DuplicateCaseLabel);
1809 }
1810 } else if (errorEnumSwitch) {
1811 //error recovery: the selector is erroneous, and all the case labels
1812 //are identifiers. This could be an enum switch - don't report resolve
1813 //error for the case label:
1814 var prevResolveHelper = rs.basicLogResolveHelper;
1815 try {
1816 rs.basicLogResolveHelper = rs.silentLogResolveHelper;
1817 attribExpr(expr, switchEnv, seltype);
1818 } finally {
1819 rs.basicLogResolveHelper = prevResolveHelper;
1820 }
1821 } else {
1822 Type pattype = attribTree(expr, switchEnv, caseLabelResultInfo(seltype));
1823 if (!pattype.hasTag(ERROR)) {
1824 if (pattype.constValue() == null) {
1825 Symbol s = TreeInfo.symbol(expr);
1826 if (s != null && s.kind == TYP) {
1827 log.error(expr.pos(),
1828 Errors.PatternExpected);
1829 } else if (s == null || !s.isEnum()) {
1830 log.error(expr.pos(),
1831 (stringSwitch ? Errors.StringConstReq
1832 : intSwitch ? Errors.ConstExprReq
1833 : Errors.PatternOrEnumReq));
1834 } else if (!constants.add(s)) {
1835 log.error(label.pos(), Errors.DuplicateCaseLabel);
1836 }
1837 }
1838 else {
1839 boolean isLongFloatDoubleOrBooleanConstant =
1840 pattype.getTag().isInSuperClassesOf(LONG) || pattype.getTag().equals(BOOLEAN);
1841 if (isLongFloatDoubleOrBooleanConstant) {
1842 preview.checkSourceLevel(label.pos(), Feature.PRIMITIVE_PATTERNS);
1843 }
1844 if (!stringSwitch && !intSwitch && !(isLongFloatDoubleOrBooleanConstant && types.isSameType(seltypeUnboxed, pattype))) {
1845 log.error(label.pos(), Errors.ConstantLabelNotCompatible(pattype, seltype));
1846 } else if (!constants.add(pattype.constValue())) {
1847 log.error(c.pos(), Errors.DuplicateCaseLabel);
1848 }
1849 }
1850 }
1851 }
1852 } else if (label instanceof JCDefaultCaseLabel def) {
1853 if (hasDefault) {
1854 log.error(label.pos(), Errors.DuplicateDefaultLabel);
1855 } else if (hasUnconditionalPattern) {
1856 log.error(label.pos(), Errors.UnconditionalPatternAndDefault);
1857 } else if (booleanSwitch && constants.containsAll(Set.of(0, 1))) {
1858 log.error(label.pos(), Errors.DefaultAndBothBooleanValues);
1859 }
1860 hasDefault = true;
1861 matchBindings = MatchBindingsComputer.EMPTY;
1862 } else if (label instanceof JCPatternCaseLabel patternlabel) {
1863 //pattern
1864 JCPattern pat = patternlabel.pat;
1865 attribExpr(pat, switchEnv, seltype);
1866 Type primaryType = TreeInfo.primaryPatternType(pat);
1867
1868 if (primaryType.isPrimitive()) {
1869 preview.checkSourceLevel(pat.pos(), Feature.PRIMITIVE_PATTERNS);
1870 } else if (!primaryType.hasTag(TYPEVAR)) {
1871 primaryType = chk.checkClassOrArrayType(pat.pos(), primaryType);
1872 }
1873 checkCastablePattern(pat.pos(), seltype, primaryType);
1874 Type patternType = types.erasure(primaryType);
1875 JCExpression guard = c.guard;
1876 if (guardBindings == null && guard != null) {
1877 MatchBindings afterPattern = matchBindings;
1878 Env<AttrContext> bodyEnv = bindingEnv(switchEnv, matchBindings.bindingsWhenTrue);
1879 try {
1880 attribExpr(guard, bodyEnv, syms.booleanType);
1881 } finally {
1882 bodyEnv.info.scope.leave();
1883 }
1884
1885 guardBindings = matchBindings;
1886 matchBindings = afterPattern;
1887
1888 if (TreeInfo.isBooleanWithValue(guard, 0)) {
1889 log.error(guard.pos(), Errors.GuardHasConstantExpressionFalse);
1890 }
1891 }
1892 boolean unguarded = TreeInfo.unguardedCase(c) && !pat.hasTag(RECORDPATTERN);
1893 boolean unconditional =
1894 unguarded &&
1895 !patternType.isErroneous() &&
1896 types.isUnconditionallyExactTypeBased(seltype, patternType);
1897 if (unconditional) {
1898 if (hasUnconditionalPattern) {
1899 log.error(pat.pos(), Errors.DuplicateUnconditionalPattern);
1900 } else if (hasDefault) {
1901 log.error(pat.pos(), Errors.UnconditionalPatternAndDefault);
1902 } else if (booleanSwitch && constants.containsAll(Set.of(0, 1))) {
1903 log.error(pat.pos(), Errors.UnconditionalPatternAndBothBooleanValues);
1904 }
1905 hasUnconditionalPattern = true;
1906 unconditionalCaseLabel = label;
1907 }
1908 lastPatternErroneous = patternType.isErroneous();
1909 } else {
1910 Assert.error();
1911 }
1912 currentBindings = matchBindingsComputer.switchCase(label, currentBindings, matchBindings);
1913 }
1914
1915 if (guardBindings != null) {
1916 currentBindings = matchBindingsComputer.caseGuard(c, currentBindings, guardBindings);
1917 }
1918
1919 Env<AttrContext> caseEnv =
1920 bindingEnv(switchEnv, c, currentBindings.bindingsWhenTrue);
1921 try {
1922 attribCase.accept(c, caseEnv);
1923 } finally {
1924 caseEnv.info.scope.leave();
1925 }
1926 addVars(c.stats, switchEnv.info.scope);
1927
1928 preFlow(c);
1929 c.completesNormally = flow.aliveAfter(caseEnv, c, make);
1930 }
1931 if (patternSwitch) {
1932 chk.checkSwitchCaseStructure(cases);
1933 chk.checkSwitchCaseLabelDominated(unconditionalCaseLabel, cases);
1934 }
1935 if (switchTree.hasTag(SWITCH)) {
1936 ((JCSwitch) switchTree).hasUnconditionalPattern =
1937 hasDefault || hasUnconditionalPattern || lastPatternErroneous;
1938 ((JCSwitch) switchTree).patternSwitch = patternSwitch;
1939 } else if (switchTree.hasTag(SWITCH_EXPRESSION)) {
1940 ((JCSwitchExpression) switchTree).hasUnconditionalPattern =
1941 hasDefault || hasUnconditionalPattern || lastPatternErroneous;
1942 ((JCSwitchExpression) switchTree).patternSwitch = patternSwitch;
1943 } else {
1944 Assert.error(switchTree.getTag().name());
1945 }
1946 } finally {
1947 switchEnv.info.scope.leave();
1948 }
1949 }
1950 // where
1951 private ResultInfo caseLabelResultInfo(Type seltype) {
1952 return new ResultInfo(KindSelector.VAL_TYP,
1953 !seltype.hasTag(ERROR) ? seltype
1954 : Type.noType);
1955 }
1956 /** Add any variables defined in stats to the switch scope. */
1957 private static void addVars(List<JCStatement> stats, WriteableScope switchScope) {
1958 for (;stats.nonEmpty(); stats = stats.tail) {
1959 JCTree stat = stats.head;
1960 if (stat.hasTag(VARDEF))
1961 switchScope.enter(((JCVariableDecl) stat).sym);
1962 }
1963 }
1964 // where
1965 /** Return the selected enumeration constant symbol, or null. */
1966 private Symbol enumConstant(JCTree tree, Type enumType) {
1967 if (tree.hasTag(IDENT)) {
1968 JCIdent ident = (JCIdent)tree;
1969 Name name = ident.name;
1970 for (Symbol sym : enumType.tsym.members().getSymbolsByName(name)) {
1971 if (sym.kind == VAR) {
1972 Symbol s = ident.sym = sym;
1973 ((VarSymbol)s).getConstValue(); // ensure initializer is evaluated
1974 ident.type = s.type;
1975 return ((s.flags_field & Flags.ENUM) == 0)
1976 ? null : s;
1977 }
1978 }
1979 }
1980 return null;
1981 }
1982
1983 public void visitSynchronized(JCSynchronized tree) {
1984 boolean identityType = chk.checkIdentityType(tree.pos(), attribExpr(tree.lock, env));
1985 if (identityType && tree.lock.type != null && tree.lock.type.isValueBased()) {
1986 log.warning(tree.pos(), LintWarnings.AttemptToSynchronizeOnInstanceOfValueBasedClass);
1987 }
1988 attribStat(tree.body, env);
1989 result = null;
1990 }
1991
1992 public void visitTry(JCTry tree) {
1993 // Create a new local environment with a local
1994 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
1995 try {
1996 boolean isTryWithResource = tree.resources.nonEmpty();
1997 // Create a nested environment for attributing the try block if needed
1998 Env<AttrContext> tryEnv = isTryWithResource ?
1999 env.dup(tree, localEnv.info.dup(localEnv.info.scope.dup())) :
2000 localEnv;
2001 try {
2002 // Attribute resource declarations
2003 for (JCTree resource : tree.resources) {
2004 CheckContext twrContext = new Check.NestedCheckContext(resultInfo.checkContext) {
2005 @Override
2006 public void report(DiagnosticPosition pos, JCDiagnostic details) {
2007 chk.basicHandler.report(pos, diags.fragment(Fragments.TryNotApplicableToType(details)));
2008 }
2009 };
2010 ResultInfo twrResult =
2011 new ResultInfo(KindSelector.VAR,
2012 syms.autoCloseableType,
2013 twrContext);
2014 if (resource.hasTag(VARDEF)) {
2015 attribStat(resource, tryEnv);
2016 twrResult.check(resource, resource.type);
2017
2018 //check that resource type cannot throw InterruptedException
2019 checkAutoCloseable(localEnv, resource, true);
2020
2021 VarSymbol var = ((JCVariableDecl) resource).sym;
2022
2023 var.flags_field |= Flags.FINAL;
2024 var.setData(ElementKind.RESOURCE_VARIABLE);
2025 } else {
2026 attribTree(resource, tryEnv, twrResult);
2027 }
2028 }
2029 // Attribute body
2030 attribStat(tree.body, tryEnv);
2031 } finally {
2032 if (isTryWithResource)
2033 tryEnv.info.scope.leave();
2034 }
2035
2036 // Attribute catch clauses
2037 for (List<JCCatch> l = tree.catchers; l.nonEmpty(); l = l.tail) {
2038 JCCatch c = l.head;
2039 Env<AttrContext> catchEnv =
2040 localEnv.dup(c, localEnv.info.dup(localEnv.info.scope.dup()));
2041 try {
2042 Type ctype = attribStat(c.param, catchEnv);
2043 if (TreeInfo.isMultiCatch(c)) {
2044 //multi-catch parameter is implicitly marked as final
2045 c.param.sym.flags_field |= FINAL | UNION;
2046 }
2047 if (c.param.sym.kind == VAR) {
2048 c.param.sym.setData(ElementKind.EXCEPTION_PARAMETER);
2049 }
2050 chk.checkType(c.param.vartype.pos(),
2051 chk.checkClassType(c.param.vartype.pos(), ctype),
2052 syms.throwableType);
2053 attribStat(c.body, catchEnv);
2054 } finally {
2055 catchEnv.info.scope.leave();
2056 }
2057 }
2058
2059 // Attribute finalizer
2060 if (tree.finalizer != null) attribStat(tree.finalizer, localEnv);
2061 result = null;
2062 }
2063 finally {
2064 localEnv.info.scope.leave();
2065 }
2066 }
2067
2068 void checkAutoCloseable(Env<AttrContext> env, JCTree tree, boolean useSite) {
2069 DiagnosticPosition pos = tree.pos();
2070 Type resource = tree.type;
2071 if (!resource.isErroneous() &&
2072 types.asSuper(resource, syms.autoCloseableType.tsym) != null &&
2073 !types.isSameType(resource, syms.autoCloseableType)) { // Don't emit warning for AutoCloseable itself
2074 Symbol close = syms.noSymbol;
2075 Log.DiagnosticHandler discardHandler = log.new DiscardDiagnosticHandler();
2076 try {
2077 close = rs.resolveQualifiedMethod(pos,
2078 env,
2079 types.skipTypeVars(resource, false),
2080 names.close,
2081 List.nil(),
2082 List.nil());
2083 }
2084 finally {
2085 log.popDiagnosticHandler(discardHandler);
2086 }
2087 if (close.kind == MTH &&
2088 (useSite || close.owner != syms.autoCloseableType.tsym) &&
2089 ((MethodSymbol)close).binaryOverrides(syms.autoCloseableClose, resource.tsym, types) &&
2090 chk.isHandled(syms.interruptedExceptionType, types.memberType(resource, close).getThrownTypes())) {
2091 if (!useSite && close.owner == resource.tsym) {
2092 log.warning(TreeInfo.diagnosticPositionFor(close, tree),
2093 LintWarnings.TryResourceCanThrowInterruptedExc(resource));
2094 } else {
2095 log.warning(pos, LintWarnings.TryResourceThrowsInterruptedExc(resource));
2096 }
2097 }
2098 }
2099 }
2100
2101 public void visitConditional(JCConditional tree) {
2102 Type condtype = attribExpr(tree.cond, env, syms.booleanType);
2103 MatchBindings condBindings = matchBindings;
2104
2105 tree.polyKind = (pt().hasTag(NONE) && pt() != Type.recoveryType && pt() != Infer.anyPoly ||
2106 isBooleanOrNumeric(env, tree)) ?
2107 PolyKind.STANDALONE : PolyKind.POLY;
2108
2109 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) {
2110 //this means we are returning a poly conditional from void-compatible lambda expression
2111 resultInfo.checkContext.report(tree, diags.fragment(Fragments.ConditionalTargetCantBeVoid));
2112 result = tree.type = types.createErrorType(resultInfo.pt);
2113 return;
2114 }
2115
2116 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ?
2117 unknownExprInfo :
2118 resultInfo.dup(conditionalContext(resultInfo.checkContext));
2119
2120
2121 // x ? y : z
2122 // include x's bindings when true in y
2123 // include x's bindings when false in z
2124
2125 Type truetype;
2126 Env<AttrContext> trueEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
2127 try {
2128 truetype = attribTree(tree.truepart, trueEnv, condInfo);
2129 } finally {
2130 trueEnv.info.scope.leave();
2131 }
2132
2133 MatchBindings trueBindings = matchBindings;
2134
2135 Type falsetype;
2136 Env<AttrContext> falseEnv = bindingEnv(env, condBindings.bindingsWhenFalse);
2137 try {
2138 falsetype = attribTree(tree.falsepart, falseEnv, condInfo);
2139 } finally {
2140 falseEnv.info.scope.leave();
2141 }
2142
2143 MatchBindings falseBindings = matchBindings;
2144
2145 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ?
2146 condType(List.of(tree.truepart.pos(), tree.falsepart.pos()),
2147 List.of(truetype, falsetype)) : pt();
2148 if (condtype.constValue() != null &&
2149 truetype.constValue() != null &&
2150 falsetype.constValue() != null &&
2151 !owntype.hasTag(NONE)) {
2152 //constant folding
2153 owntype = cfolder.coerce(condtype.isTrue() ? truetype : falsetype, owntype);
2154 }
2155 result = check(tree, owntype, KindSelector.VAL, resultInfo);
2156 matchBindings = matchBindingsComputer.conditional(tree, condBindings, trueBindings, falseBindings);
2157 }
2158 //where
2159 private boolean isBooleanOrNumeric(Env<AttrContext> env, JCExpression tree) {
2160 switch (tree.getTag()) {
2161 case LITERAL: return ((JCLiteral)tree).typetag.isSubRangeOf(DOUBLE) ||
2162 ((JCLiteral)tree).typetag == BOOLEAN ||
2163 ((JCLiteral)tree).typetag == BOT;
2164 case LAMBDA: case REFERENCE: return false;
2165 case PARENS: return isBooleanOrNumeric(env, ((JCParens)tree).expr);
2166 case CONDEXPR:
2167 JCConditional condTree = (JCConditional)tree;
2168 return isBooleanOrNumeric(env, condTree.truepart) &&
2169 isBooleanOrNumeric(env, condTree.falsepart);
2170 case APPLY:
2171 JCMethodInvocation speculativeMethodTree =
2172 (JCMethodInvocation)deferredAttr.attribSpeculative(
2173 tree, env, unknownExprInfo,
2174 argumentAttr.withLocalCacheContext());
2175 Symbol msym = TreeInfo.symbol(speculativeMethodTree.meth);
2176 Type receiverType = speculativeMethodTree.meth.hasTag(IDENT) ?
2177 env.enclClass.type :
2178 ((JCFieldAccess)speculativeMethodTree.meth).selected.type;
2179 Type owntype = types.memberType(receiverType, msym).getReturnType();
2180 return primitiveOrBoxed(owntype);
2181 case NEWCLASS:
2182 JCExpression className =
2183 removeClassParams.translate(((JCNewClass)tree).clazz);
2184 JCExpression speculativeNewClassTree =
2185 (JCExpression)deferredAttr.attribSpeculative(
2186 className, env, unknownTypeInfo,
2187 argumentAttr.withLocalCacheContext());
2188 return primitiveOrBoxed(speculativeNewClassTree.type);
2189 default:
2190 Type speculativeType = deferredAttr.attribSpeculative(tree, env, unknownExprInfo,
2191 argumentAttr.withLocalCacheContext()).type;
2192 return primitiveOrBoxed(speculativeType);
2193 }
2194 }
2195 //where
2196 boolean primitiveOrBoxed(Type t) {
2197 return (!t.hasTag(TYPEVAR) && !t.isErroneous() && types.unboxedTypeOrType(t).isPrimitive());
2198 }
2199
2200 TreeTranslator removeClassParams = new TreeTranslator() {
2201 @Override
2202 public void visitTypeApply(JCTypeApply tree) {
2203 result = translate(tree.clazz);
2204 }
2205 };
2206
2207 CheckContext conditionalContext(CheckContext checkContext) {
2208 return new Check.NestedCheckContext(checkContext) {
2209 //this will use enclosing check context to check compatibility of
2210 //subexpression against target type; if we are in a method check context,
2211 //depending on whether boxing is allowed, we could have incompatibilities
2212 @Override
2213 public void report(DiagnosticPosition pos, JCDiagnostic details) {
2214 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleTypeInConditional(details)));
2215 }
2216 };
2217 }
2218
2219 /** Compute the type of a conditional expression, after
2220 * checking that it exists. See JLS 15.25. Does not take into
2221 * account the special case where condition and both arms
2222 * are constants.
2223 *
2224 * @param pos The source position to be used for error
2225 * diagnostics.
2226 * @param thentype The type of the expression's then-part.
2227 * @param elsetype The type of the expression's else-part.
2228 */
2229 Type condType(List<DiagnosticPosition> positions, List<Type> condTypes) {
2230 if (condTypes.isEmpty()) {
2231 return syms.objectType; //TODO: how to handle?
2232 }
2233 Type first = condTypes.head;
2234 // If same type, that is the result
2235 if (condTypes.tail.stream().allMatch(t -> types.isSameType(first, t)))
2236 return first.baseType();
2237
2238 List<Type> unboxedTypes = condTypes.stream()
2239 .map(t -> t.isPrimitive() ? t : types.unboxedType(t))
2240 .collect(List.collector());
2241
2242 // Otherwise, if both arms can be converted to a numeric
2243 // type, return the least numeric type that fits both arms
2244 // (i.e. return larger of the two, or return int if one
2245 // arm is short, the other is char).
2246 if (unboxedTypes.stream().allMatch(t -> t.isPrimitive())) {
2247 // If one arm has an integer subrange type (i.e., byte,
2248 // short, or char), and the other is an integer constant
2249 // that fits into the subrange, return the subrange type.
2250 for (Type type : unboxedTypes) {
2251 if (!type.getTag().isStrictSubRangeOf(INT)) {
2252 continue;
2253 }
2254 if (unboxedTypes.stream().filter(t -> t != type).allMatch(t -> t.hasTag(INT) && types.isAssignable(t, type)))
2255 return type.baseType();
2256 }
2257
2258 for (TypeTag tag : primitiveTags) {
2259 Type candidate = syms.typeOfTag[tag.ordinal()];
2260 if (unboxedTypes.stream().allMatch(t -> types.isSubtype(t, candidate))) {
2261 return candidate;
2262 }
2263 }
2264 }
2265
2266 // Those were all the cases that could result in a primitive
2267 condTypes = condTypes.stream()
2268 .map(t -> t.isPrimitive() ? types.boxedClass(t).type : t)
2269 .collect(List.collector());
2270
2271 for (Type type : condTypes) {
2272 if (condTypes.stream().filter(t -> t != type).allMatch(t -> types.isAssignable(t, type)))
2273 return type.baseType();
2274 }
2275
2276 Iterator<DiagnosticPosition> posIt = positions.iterator();
2277
2278 condTypes = condTypes.stream()
2279 .map(t -> chk.checkNonVoid(posIt.next(), t))
2280 .collect(List.collector());
2281
2282 // both are known to be reference types. The result is
2283 // lub(thentype,elsetype). This cannot fail, as it will
2284 // always be possible to infer "Object" if nothing better.
2285 return types.lub(condTypes.stream()
2286 .map(t -> t.baseType())
2287 .filter(t -> !t.hasTag(BOT))
2288 .collect(List.collector()));
2289 }
2290
2291 static final TypeTag[] primitiveTags = new TypeTag[]{
2292 BYTE,
2293 CHAR,
2294 SHORT,
2295 INT,
2296 LONG,
2297 FLOAT,
2298 DOUBLE,
2299 BOOLEAN,
2300 };
2301
2302 Env<AttrContext> bindingEnv(Env<AttrContext> env, List<BindingSymbol> bindings) {
2303 return bindingEnv(env, env.tree, bindings);
2304 }
2305
2306 Env<AttrContext> bindingEnv(Env<AttrContext> env, JCTree newTree, List<BindingSymbol> bindings) {
2307 Env<AttrContext> env1 = env.dup(newTree, env.info.dup(env.info.scope.dup()));
2308 bindings.forEach(env1.info.scope::enter);
2309 return env1;
2310 }
2311
2312 public void visitIf(JCIf tree) {
2313 attribExpr(tree.cond, env, syms.booleanType);
2314
2315 // if (x) { y } [ else z ]
2316 // include x's bindings when true in y
2317 // include x's bindings when false in z
2318
2319 MatchBindings condBindings = matchBindings;
2320 Env<AttrContext> thenEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
2321
2322 try {
2323 attribStat(tree.thenpart, thenEnv);
2324 } finally {
2325 thenEnv.info.scope.leave();
2326 }
2327
2328 preFlow(tree.thenpart);
2329 boolean aliveAfterThen = flow.aliveAfter(env, tree.thenpart, make);
2330 boolean aliveAfterElse;
2331
2332 if (tree.elsepart != null) {
2333 Env<AttrContext> elseEnv = bindingEnv(env, condBindings.bindingsWhenFalse);
2334 try {
2335 attribStat(tree.elsepart, elseEnv);
2336 } finally {
2337 elseEnv.info.scope.leave();
2338 }
2339 preFlow(tree.elsepart);
2340 aliveAfterElse = flow.aliveAfter(env, tree.elsepart, make);
2341 } else {
2342 aliveAfterElse = true;
2343 }
2344
2345 chk.checkEmptyIf(tree);
2346
2347 List<BindingSymbol> afterIfBindings = List.nil();
2348
2349 if (aliveAfterThen && !aliveAfterElse) {
2350 afterIfBindings = condBindings.bindingsWhenTrue;
2351 } else if (aliveAfterElse && !aliveAfterThen) {
2352 afterIfBindings = condBindings.bindingsWhenFalse;
2353 }
2354
2355 addBindings2Scope(tree, afterIfBindings);
2356
2357 result = null;
2358 }
2359
2360 void preFlow(JCTree tree) {
2361 attrRecover.doRecovery();
2362 new PostAttrAnalyzer() {
2363 @Override
2364 public void scan(JCTree tree) {
2365 if (tree == null ||
2366 (tree.type != null &&
2367 tree.type == Type.stuckType)) {
2368 //don't touch stuck expressions!
2369 return;
2370 }
2371 super.scan(tree);
2372 }
2373
2374 @Override
2375 public void visitClassDef(JCClassDecl that) {
2376 if (that.sym != null) {
2377 // Method preFlow shouldn't visit class definitions
2378 // that have not been entered and attributed.
2379 // See JDK-8254557 and JDK-8203277 for more details.
2380 super.visitClassDef(that);
2381 }
2382 }
2383
2384 @Override
2385 public void visitLambda(JCLambda that) {
2386 if (that.type != null) {
2387 // Method preFlow shouldn't visit lambda expressions
2388 // that have not been entered and attributed.
2389 // See JDK-8254557 and JDK-8203277 for more details.
2390 super.visitLambda(that);
2391 }
2392 }
2393 }.scan(tree);
2394 }
2395
2396 public void visitExec(JCExpressionStatement tree) {
2397 //a fresh environment is required for 292 inference to work properly ---
2398 //see Infer.instantiatePolymorphicSignatureInstance()
2399 Env<AttrContext> localEnv = env.dup(tree);
2400 attribExpr(tree.expr, localEnv);
2401 result = null;
2402 }
2403
2404 public void visitBreak(JCBreak tree) {
2405 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
2406 result = null;
2407 }
2408
2409 public void visitYield(JCYield tree) {
2410 if (env.info.yieldResult != null) {
2411 attribTree(tree.value, env, env.info.yieldResult);
2412 tree.target = findJumpTarget(tree.pos(), tree.getTag(), names.empty, env);
2413 } else {
2414 log.error(tree.pos(), tree.value.hasTag(PARENS)
2415 ? Errors.NoSwitchExpressionQualify
2416 : Errors.NoSwitchExpression);
2417 attribTree(tree.value, env, unknownExprInfo);
2418 }
2419 result = null;
2420 }
2421
2422 public void visitContinue(JCContinue tree) {
2423 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
2424 result = null;
2425 }
2426 //where
2427 /** Return the target of a break, continue or yield statement,
2428 * if it exists, report an error if not.
2429 * Note: The target of a labelled break or continue is the
2430 * (non-labelled) statement tree referred to by the label,
2431 * not the tree representing the labelled statement itself.
2432 *
2433 * @param pos The position to be used for error diagnostics
2434 * @param tag The tag of the jump statement. This is either
2435 * Tree.BREAK or Tree.CONTINUE.
2436 * @param label The label of the jump statement, or null if no
2437 * label is given.
2438 * @param env The environment current at the jump statement.
2439 */
2440 private JCTree findJumpTarget(DiagnosticPosition pos,
2441 JCTree.Tag tag,
2442 Name label,
2443 Env<AttrContext> env) {
2444 Pair<JCTree, Error> jumpTarget = findJumpTargetNoError(tag, label, env);
2445
2446 if (jumpTarget.snd != null) {
2447 log.error(pos, jumpTarget.snd);
2448 }
2449
2450 return jumpTarget.fst;
2451 }
2452 /** Return the target of a break or continue statement, if it exists,
2453 * report an error if not.
2454 * Note: The target of a labelled break or continue is the
2455 * (non-labelled) statement tree referred to by the label,
2456 * not the tree representing the labelled statement itself.
2457 *
2458 * @param tag The tag of the jump statement. This is either
2459 * Tree.BREAK or Tree.CONTINUE.
2460 * @param label The label of the jump statement, or null if no
2461 * label is given.
2462 * @param env The environment current at the jump statement.
2463 */
2464 private Pair<JCTree, JCDiagnostic.Error> findJumpTargetNoError(JCTree.Tag tag,
2465 Name label,
2466 Env<AttrContext> env) {
2467 // Search environments outwards from the point of jump.
2468 Env<AttrContext> env1 = env;
2469 JCDiagnostic.Error pendingError = null;
2470 LOOP:
2471 while (env1 != null) {
2472 switch (env1.tree.getTag()) {
2473 case LABELLED:
2474 JCLabeledStatement labelled = (JCLabeledStatement)env1.tree;
2475 if (label == labelled.label) {
2476 // If jump is a continue, check that target is a loop.
2477 if (tag == CONTINUE) {
2478 if (!labelled.body.hasTag(DOLOOP) &&
2479 !labelled.body.hasTag(WHILELOOP) &&
2480 !labelled.body.hasTag(FORLOOP) &&
2481 !labelled.body.hasTag(FOREACHLOOP)) {
2482 pendingError = Errors.NotLoopLabel(label);
2483 }
2484 // Found labelled statement target, now go inwards
2485 // to next non-labelled tree.
2486 return Pair.of(TreeInfo.referencedStatement(labelled), pendingError);
2487 } else {
2488 return Pair.of(labelled, pendingError);
2489 }
2490 }
2491 break;
2492 case DOLOOP:
2493 case WHILELOOP:
2494 case FORLOOP:
2495 case FOREACHLOOP:
2496 if (label == null) return Pair.of(env1.tree, pendingError);
2497 break;
2498 case SWITCH:
2499 if (label == null && tag == BREAK) return Pair.of(env1.tree, null);
2500 break;
2501 case SWITCH_EXPRESSION:
2502 if (tag == YIELD) {
2503 return Pair.of(env1.tree, null);
2504 } else if (tag == BREAK) {
2505 pendingError = Errors.BreakOutsideSwitchExpression;
2506 } else {
2507 pendingError = Errors.ContinueOutsideSwitchExpression;
2508 }
2509 break;
2510 case LAMBDA:
2511 case METHODDEF:
2512 case CLASSDEF:
2513 break LOOP;
2514 default:
2515 }
2516 env1 = env1.next;
2517 }
2518 if (label != null)
2519 return Pair.of(null, Errors.UndefLabel(label));
2520 else if (pendingError != null)
2521 return Pair.of(null, pendingError);
2522 else if (tag == CONTINUE)
2523 return Pair.of(null, Errors.ContOutsideLoop);
2524 else
2525 return Pair.of(null, Errors.BreakOutsideSwitchLoop);
2526 }
2527
2528 public void visitReturn(JCReturn tree) {
2529 // Check that there is an enclosing method which is
2530 // nested within than the enclosing class.
2531 if (env.info.returnResult == null) {
2532 log.error(tree.pos(), Errors.RetOutsideMeth);
2533 } else if (env.info.yieldResult != null) {
2534 log.error(tree.pos(), Errors.ReturnOutsideSwitchExpression);
2535 if (tree.expr != null) {
2536 attribExpr(tree.expr, env, env.info.yieldResult.pt);
2537 }
2538 } else if (!env.info.isLambda &&
2539 env.enclMethod != null &&
2540 TreeInfo.isCompactConstructor(env.enclMethod)) {
2541 log.error(env.enclMethod,
2542 Errors.InvalidCanonicalConstructorInRecord(Fragments.Compact, env.enclMethod.sym.name, Fragments.CanonicalCantHaveReturnStatement));
2543 } else {
2544 // Attribute return expression, if it exists, and check that
2545 // it conforms to result type of enclosing method.
2546 if (tree.expr != null) {
2547 if (env.info.returnResult.pt.hasTag(VOID)) {
2548 env.info.returnResult.checkContext.report(tree.expr.pos(),
2549 diags.fragment(Fragments.UnexpectedRetVal));
2550 }
2551 attribTree(tree.expr, env, env.info.returnResult);
2552 } else if (!env.info.returnResult.pt.hasTag(VOID) &&
2553 !env.info.returnResult.pt.hasTag(NONE)) {
2554 env.info.returnResult.checkContext.report(tree.pos(),
2555 diags.fragment(Fragments.MissingRetVal(env.info.returnResult.pt)));
2556 }
2557 }
2558 result = null;
2559 }
2560
2561 public void visitThrow(JCThrow tree) {
2562 Type owntype = attribExpr(tree.expr, env, Type.noType);
2563 chk.checkType(tree, owntype, syms.throwableType);
2564 result = null;
2565 }
2566
2567 public void visitAssert(JCAssert tree) {
2568 attribExpr(tree.cond, env, syms.booleanType);
2569 if (tree.detail != null) {
2570 chk.checkNonVoid(tree.detail.pos(), attribExpr(tree.detail, env));
2571 }
2572 result = null;
2573 }
2574
2575 /** Visitor method for method invocations.
2576 * NOTE: The method part of an application will have in its type field
2577 * the return type of the method, not the method's type itself!
2578 */
2579 public void visitApply(JCMethodInvocation tree) {
2580 // The local environment of a method application is
2581 // a new environment nested in the current one.
2582 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
2583
2584 // The types of the actual method arguments.
2585 List<Type> argtypes;
2586
2587 // The types of the actual method type arguments.
2588 List<Type> typeargtypes = null;
2589
2590 Name methName = TreeInfo.name(tree.meth);
2591
2592 boolean isConstructorCall =
2593 methName == names._this || methName == names._super;
2594
2595 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
2596 if (isConstructorCall) {
2597
2598 // Attribute arguments, yielding list of argument types.
2599 KindSelector kind = attribArgs(KindSelector.MTH, tree.args, localEnv, argtypesBuf);
2600 argtypes = argtypesBuf.toList();
2601 typeargtypes = attribTypes(tree.typeargs, localEnv);
2602
2603 // End of constructor prologue. Done with this()/super() parameters.
2604 env.info.earlyContext = EarlyConstructionContext.NONE;
2605
2606 // Variable `site' points to the class in which the called
2607 // constructor is defined.
2608 Type site = env.enclClass.sym.type;
2609 if (methName == names._super) {
2610 if (site == syms.objectType) {
2611 log.error(tree.meth.pos(), Errors.NoSuperclass(site));
2612 site = types.createErrorType(syms.objectType);
2613 } else {
2614 site = types.supertype(site);
2615 }
2616 }
2617
2618 if (site.hasTag(CLASS)) {
2619 Type encl = site.getEnclosingType();
2620 while (encl != null && encl.hasTag(TYPEVAR))
2621 encl = encl.getUpperBound();
2622 if (encl.hasTag(CLASS)) {
2623 // we are calling a nested class
2624
2625 if (tree.meth.hasTag(SELECT)) {
2626 JCTree qualifier = ((JCFieldAccess) tree.meth).selected;
2627
2628 // We are seeing a prefixed call, of the form
2629 // <expr>.super(...).
2630 // Check that the prefix expression conforms
2631 // to the outer instance type of the class.
2632 chk.checkRefType(qualifier.pos(),
2633 attribExpr(qualifier, localEnv,
2634 encl));
2635 }
2636 } else if (tree.meth.hasTag(SELECT)) {
2637 log.error(tree.meth.pos(),
2638 Errors.IllegalQualNotIcls(site.tsym));
2639 attribExpr(((JCFieldAccess) tree.meth).selected, localEnv, site);
2640 }
2641
2642 if (tree.meth.hasTag(IDENT)) {
2643 // non-qualified super(...) call; check whether explicit constructor
2644 // invocation is well-formed. If the super class is an inner class,
2645 // make sure that an appropriate implicit qualifier exists. If the super
2646 // class is a local class, make sure that the current class is defined
2647 // in the same context as the local class.
2648 checkNewInnerClass(tree.meth.pos(), localEnv, site, true);
2649 }
2650
2651 // if we're calling a java.lang.Enum constructor,
2652 // prefix the implicit String and int parameters
2653 if (site.tsym == syms.enumSym)
2654 argtypes = argtypes.prepend(syms.intType).prepend(syms.stringType);
2655
2656 // Resolve the called constructor under the assumption
2657 // that we are referring to a superclass instance of the
2658 // current instance (JLS ???).
2659 boolean selectSuperPrev = localEnv.info.selectSuper;
2660 localEnv.info.selectSuper = true;
2661 localEnv.info.pendingResolutionPhase = null;
2662 Symbol sym = rs.resolveConstructor(
2663 tree.meth.pos(), localEnv, site, argtypes, typeargtypes);
2664 localEnv.info.selectSuper = selectSuperPrev;
2665
2666 // Set method symbol to resolved constructor...
2667 TreeInfo.setSymbol(tree.meth, sym);
2668
2669 // ...and check that it is legal in the current context.
2670 // (this will also set the tree's type)
2671 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
2672 checkId(tree.meth, site, sym, localEnv,
2673 new ResultInfo(kind, mpt));
2674 } else if (site.hasTag(ERROR) && tree.meth.hasTag(SELECT)) {
2675 attribExpr(((JCFieldAccess) tree.meth).selected, localEnv, site);
2676 }
2677 // Otherwise, `site' is an error type and we do nothing
2678 result = tree.type = syms.voidType;
2679 } else {
2680 // Otherwise, we are seeing a regular method call.
2681 // Attribute the arguments, yielding list of argument types, ...
2682 KindSelector kind = attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf);
2683 argtypes = argtypesBuf.toList();
2684 typeargtypes = attribAnyTypes(tree.typeargs, localEnv);
2685
2686 // ... and attribute the method using as a prototype a methodtype
2687 // whose formal argument types is exactly the list of actual
2688 // arguments (this will also set the method symbol).
2689 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
2690 localEnv.info.pendingResolutionPhase = null;
2691 Type mtype = attribTree(tree.meth, localEnv, new ResultInfo(kind, mpt, resultInfo.checkContext));
2692
2693 // Compute the result type.
2694 Type restype = mtype.getReturnType();
2695 if (restype.hasTag(WILDCARD))
2696 throw new AssertionError(mtype);
2697
2698 Type qualifier = (tree.meth.hasTag(SELECT))
2699 ? ((JCFieldAccess) tree.meth).selected.type
2700 : env.enclClass.sym.type;
2701 Symbol msym = TreeInfo.symbol(tree.meth);
2702 restype = adjustMethodReturnType(msym, qualifier, methName, argtypes, restype);
2703
2704 chk.checkRefTypes(tree.typeargs, typeargtypes);
2705
2706 // Check that value of resulting type is admissible in the
2707 // current context. Also, capture the return type
2708 Type capturedRes = resultInfo.checkContext.inferenceContext().cachedCapture(tree, restype, true);
2709 result = check(tree, capturedRes, KindSelector.VAL, resultInfo);
2710 }
2711 chk.checkRequiresIdentity(tree, env.info.lint);
2712 chk.validate(tree.typeargs, localEnv);
2713 }
2714 //where
2715 Type adjustMethodReturnType(Symbol msym, Type qualifierType, Name methodName, List<Type> argtypes, Type restype) {
2716 if (msym != null &&
2717 (msym.owner == syms.objectType.tsym || msym.owner.isInterface()) &&
2718 methodName == names.getClass &&
2719 argtypes.isEmpty()) {
2720 // as a special case, x.getClass() has type Class<? extends |X|>
2721 return new ClassType(restype.getEnclosingType(),
2722 List.of(new WildcardType(types.erasure(qualifierType.baseType()),
2723 BoundKind.EXTENDS,
2724 syms.boundClass)),
2725 restype.tsym,
2726 restype.getMetadata());
2727 } else if (msym != null &&
2728 msym.owner == syms.arrayClass &&
2729 methodName == names.clone &&
2730 types.isArray(qualifierType)) {
2731 // as a special case, array.clone() has a result that is
2732 // the same as static type of the array being cloned
2733 return qualifierType;
2734 } else {
2735 return restype;
2736 }
2737 }
2738
2739 /** Obtain a method type with given argument types.
2740 */
2741 Type newMethodTemplate(Type restype, List<Type> argtypes, List<Type> typeargtypes) {
2742 MethodType mt = new MethodType(argtypes, restype, List.nil(), syms.methodClass);
2743 return (typeargtypes == null) ? mt : (Type)new ForAll(typeargtypes, mt);
2744 }
2745
2746 public void visitNewClass(final JCNewClass tree) {
2747 Type owntype = types.createErrorType(tree.type);
2748
2749 // The local environment of a class creation is
2750 // a new environment nested in the current one.
2751 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
2752
2753 // The anonymous inner class definition of the new expression,
2754 // if one is defined by it.
2755 JCClassDecl cdef = tree.def;
2756
2757 // If enclosing class is given, attribute it, and
2758 // complete class name to be fully qualified
2759 JCExpression clazz = tree.clazz; // Class field following new
2760 JCExpression clazzid; // Identifier in class field
2761 JCAnnotatedType annoclazzid; // Annotated type enclosing clazzid
2762 annoclazzid = null;
2763
2764 if (clazz.hasTag(TYPEAPPLY)) {
2765 clazzid = ((JCTypeApply) clazz).clazz;
2766 if (clazzid.hasTag(ANNOTATED_TYPE)) {
2767 annoclazzid = (JCAnnotatedType) clazzid;
2768 clazzid = annoclazzid.underlyingType;
2769 }
2770 } else {
2771 if (clazz.hasTag(ANNOTATED_TYPE)) {
2772 annoclazzid = (JCAnnotatedType) clazz;
2773 clazzid = annoclazzid.underlyingType;
2774 } else {
2775 clazzid = clazz;
2776 }
2777 }
2778
2779 JCExpression clazzid1 = clazzid; // The same in fully qualified form
2780
2781 if (tree.encl != null) {
2782 // We are seeing a qualified new, of the form
2783 // <expr>.new C <...> (...) ...
2784 // In this case, we let clazz stand for the name of the
2785 // allocated class C prefixed with the type of the qualifier
2786 // expression, so that we can
2787 // resolve it with standard techniques later. I.e., if
2788 // <expr> has type T, then <expr>.new C <...> (...)
2789 // yields a clazz T.C.
2790 Type encltype = chk.checkRefType(tree.encl.pos(),
2791 attribExpr(tree.encl, env));
2792 // TODO 308: in <expr>.new C, do we also want to add the type annotations
2793 // from expr to the combined type, or not? Yes, do this.
2794 clazzid1 = make.at(clazz.pos).Select(make.Type(encltype),
2795 ((JCIdent) clazzid).name);
2796
2797 clazzid1.endpos = clazzid.getEndPosition();
2798 if (clazz.hasTag(ANNOTATED_TYPE)) {
2799 JCAnnotatedType annoType = (JCAnnotatedType) clazz;
2800 List<JCAnnotation> annos = annoType.annotations;
2801
2802 if (annoType.underlyingType.hasTag(TYPEAPPLY)) {
2803 clazzid1 = make.at(tree.pos).
2804 TypeApply(clazzid1,
2805 ((JCTypeApply) clazz).arguments);
2806 }
2807
2808 clazzid1 = make.at(tree.pos).
2809 AnnotatedType(annos, clazzid1);
2810 } else if (clazz.hasTag(TYPEAPPLY)) {
2811 clazzid1 = make.at(tree.pos).
2812 TypeApply(clazzid1,
2813 ((JCTypeApply) clazz).arguments);
2814 }
2815
2816 clazz = clazzid1;
2817 }
2818
2819 // Attribute clazz expression and store
2820 // symbol + type back into the attributed tree.
2821 Type clazztype = TreeInfo.isEnumInit(env.tree) ?
2822 attribIdentAsEnumType(env, (JCIdent)clazz) :
2823 attribType(clazz, env);
2824
2825 clazztype = chk.checkDiamond(tree, clazztype);
2826 chk.validate(clazz, localEnv);
2827 if (tree.encl != null) {
2828 // We have to work in this case to store
2829 // symbol + type back into the attributed tree.
2830 tree.clazz.type = clazztype;
2831 TreeInfo.setSymbol(clazzid, TreeInfo.symbol(clazzid1));
2832 clazzid.type = ((JCIdent) clazzid).sym.type;
2833 if (annoclazzid != null) {
2834 annoclazzid.type = clazzid.type;
2835 }
2836 if (!clazztype.isErroneous()) {
2837 if (cdef != null && clazztype.tsym.isInterface()) {
2838 log.error(tree.encl.pos(), Errors.AnonClassImplIntfNoQualForNew);
2839 } else if (clazztype.tsym.isStatic()) {
2840 log.error(tree.encl.pos(), Errors.QualifiedNewOfStaticClass(clazztype.tsym));
2841 }
2842 }
2843 } else {
2844 // Check for the existence of an apropos outer instance
2845 checkNewInnerClass(tree.pos(), env, clazztype, false);
2846 }
2847
2848 checkBreakTree(tree.clazz, localEnv);
2849
2850 // Attribute constructor arguments.
2851 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
2852 final KindSelector pkind =
2853 attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf);
2854 List<Type> argtypes = argtypesBuf.toList();
2855 List<Type> typeargtypes = attribTypes(tree.typeargs, localEnv);
2856
2857 if (clazztype.hasTag(CLASS) || clazztype.hasTag(ERROR)) {
2858 // Enums may not be instantiated except implicitly
2859 if ((clazztype.tsym.flags_field & Flags.ENUM) != 0 &&
2860 (!env.tree.hasTag(VARDEF) ||
2861 (((JCVariableDecl) env.tree).mods.flags & Flags.ENUM) == 0 ||
2862 ((JCVariableDecl) env.tree).init != tree))
2863 log.error(tree.pos(), Errors.EnumCantBeInstantiated);
2864
2865 boolean isSpeculativeDiamondInferenceRound = TreeInfo.isDiamond(tree) &&
2866 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
2867 boolean skipNonDiamondPath = false;
2868 // Check that class is not abstract
2869 if (cdef == null && !tree.classDeclRemoved() && !isSpeculativeDiamondInferenceRound && // class body may be nulled out in speculative tree copy
2870 (clazztype.tsym.flags() & (ABSTRACT | INTERFACE)) != 0) {
2871 log.error(tree.pos(),
2872 Errors.AbstractCantBeInstantiated(clazztype.tsym));
2873 skipNonDiamondPath = true;
2874 } else if (cdef != null && clazztype.tsym.isInterface()) {
2875 // Check that no constructor arguments are given to
2876 // anonymous classes implementing an interface
2877 if (!argtypes.isEmpty())
2878 log.error(tree.args.head.pos(), Errors.AnonClassImplIntfNoArgs);
2879
2880 if (!typeargtypes.isEmpty())
2881 log.error(tree.typeargs.head.pos(), Errors.AnonClassImplIntfNoTypeargs);
2882
2883 // Error recovery: pretend no arguments were supplied.
2884 argtypes = List.nil();
2885 typeargtypes = List.nil();
2886 skipNonDiamondPath = true;
2887 }
2888 if (TreeInfo.isDiamond(tree)) {
2889 ClassType site = new ClassType(clazztype.getEnclosingType(),
2890 clazztype.tsym.type.getTypeArguments(),
2891 clazztype.tsym,
2892 clazztype.getMetadata());
2893
2894 Env<AttrContext> diamondEnv = localEnv.dup(tree);
2895 diamondEnv.info.selectSuper = cdef != null || tree.classDeclRemoved();
2896 diamondEnv.info.pendingResolutionPhase = null;
2897
2898 //if the type of the instance creation expression is a class type
2899 //apply method resolution inference (JLS 15.12.2.7). The return type
2900 //of the resolved constructor will be a partially instantiated type
2901 Symbol constructor = rs.resolveDiamond(tree.pos(),
2902 diamondEnv,
2903 site,
2904 argtypes,
2905 typeargtypes);
2906 tree.constructor = constructor.baseSymbol();
2907
2908 final TypeSymbol csym = clazztype.tsym;
2909 ResultInfo diamondResult = new ResultInfo(pkind, newMethodTemplate(resultInfo.pt, argtypes, typeargtypes),
2910 diamondContext(tree, csym, resultInfo.checkContext), CheckMode.NO_TREE_UPDATE);
2911 Type constructorType = tree.constructorType = types.createErrorType(clazztype);
2912 constructorType = checkId(tree, site,
2913 constructor,
2914 diamondEnv,
2915 diamondResult);
2916
2917 tree.clazz.type = types.createErrorType(clazztype);
2918 if (!constructorType.isErroneous()) {
2919 tree.clazz.type = clazz.type = constructorType.getReturnType();
2920 tree.constructorType = types.createMethodTypeWithReturn(constructorType, syms.voidType);
2921 }
2922 clazztype = chk.checkClassType(tree.clazz, tree.clazz.type, true);
2923 }
2924
2925 // Resolve the called constructor under the assumption
2926 // that we are referring to a superclass instance of the
2927 // current instance (JLS ???).
2928 else if (!skipNonDiamondPath) {
2929 //the following code alters some of the fields in the current
2930 //AttrContext - hence, the current context must be dup'ed in
2931 //order to avoid downstream failures
2932 Env<AttrContext> rsEnv = localEnv.dup(tree);
2933 rsEnv.info.selectSuper = cdef != null;
2934 rsEnv.info.pendingResolutionPhase = null;
2935 tree.constructor = rs.resolveConstructor(
2936 tree.pos(), rsEnv, clazztype, argtypes, typeargtypes);
2937 if (cdef == null) { //do not check twice!
2938 tree.constructorType = checkId(tree,
2939 clazztype,
2940 tree.constructor,
2941 rsEnv,
2942 new ResultInfo(pkind, newMethodTemplate(syms.voidType, argtypes, typeargtypes), CheckMode.NO_TREE_UPDATE));
2943 if (rsEnv.info.lastResolveVarargs())
2944 Assert.check(tree.constructorType.isErroneous() || tree.varargsElement != null);
2945 }
2946 }
2947
2948 chk.checkRequiresIdentity(tree, env.info.lint);
2949
2950 if (cdef != null) {
2951 visitAnonymousClassDefinition(tree, clazz, clazztype, cdef, localEnv, argtypes, typeargtypes, pkind);
2952 return;
2953 }
2954
2955 if (tree.constructor != null && tree.constructor.kind == MTH)
2956 owntype = clazztype;
2957 }
2958 result = check(tree, owntype, KindSelector.VAL, resultInfo);
2959 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
2960 if (tree.constructorType != null && inferenceContext.free(tree.constructorType)) {
2961 //we need to wait for inference to finish and then replace inference vars in the constructor type
2962 inferenceContext.addFreeTypeListener(List.of(tree.constructorType),
2963 instantiatedContext -> {
2964 tree.constructorType = instantiatedContext.asInstType(tree.constructorType);
2965 });
2966 }
2967 chk.validate(tree.typeargs, localEnv);
2968 }
2969
2970 // where
2971 private void visitAnonymousClassDefinition(JCNewClass tree, JCExpression clazz, Type clazztype,
2972 JCClassDecl cdef, Env<AttrContext> localEnv,
2973 List<Type> argtypes, List<Type> typeargtypes,
2974 KindSelector pkind) {
2975 // We are seeing an anonymous class instance creation.
2976 // In this case, the class instance creation
2977 // expression
2978 //
2979 // E.new <typeargs1>C<typargs2>(args) { ... }
2980 //
2981 // is represented internally as
2982 //
2983 // E . new <typeargs1>C<typargs2>(args) ( class <empty-name> { ... } ) .
2984 //
2985 // This expression is then *transformed* as follows:
2986 //
2987 // (1) add an extends or implements clause
2988 // (2) add a constructor.
2989 //
2990 // For instance, if C is a class, and ET is the type of E,
2991 // the expression
2992 //
2993 // E.new <typeargs1>C<typargs2>(args) { ... }
2994 //
2995 // is translated to (where X is a fresh name and typarams is the
2996 // parameter list of the super constructor):
2997 //
2998 // new <typeargs1>X(<*nullchk*>E, args) where
2999 // X extends C<typargs2> {
3000 // <typarams> X(ET e, args) {
3001 // e.<typeargs1>super(args)
3002 // }
3003 // ...
3004 // }
3005 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
3006 Type enclType = clazztype.getEnclosingType();
3007 if (enclType != null &&
3008 enclType.hasTag(CLASS) &&
3009 !chk.checkDenotable((ClassType)enclType)) {
3010 log.error(tree.encl, Errors.EnclosingClassTypeNonDenotable(enclType));
3011 }
3012 final boolean isDiamond = TreeInfo.isDiamond(tree);
3013 if (isDiamond
3014 && ((tree.constructorType != null && inferenceContext.free(tree.constructorType))
3015 || (tree.clazz.type != null && inferenceContext.free(tree.clazz.type)))) {
3016 final ResultInfo resultInfoForClassDefinition = this.resultInfo;
3017 Env<AttrContext> dupLocalEnv = copyEnv(localEnv);
3018 inferenceContext.addFreeTypeListener(List.of(tree.constructorType, tree.clazz.type),
3019 instantiatedContext -> {
3020 tree.constructorType = instantiatedContext.asInstType(tree.constructorType);
3021 tree.clazz.type = clazz.type = instantiatedContext.asInstType(clazz.type);
3022 ResultInfo prevResult = this.resultInfo;
3023 try {
3024 this.resultInfo = resultInfoForClassDefinition;
3025 visitAnonymousClassDefinition(tree, clazz, clazz.type, cdef,
3026 dupLocalEnv, argtypes, typeargtypes, pkind);
3027 } finally {
3028 this.resultInfo = prevResult;
3029 }
3030 });
3031 } else {
3032 if (isDiamond && clazztype.hasTag(CLASS)) {
3033 List<Type> invalidDiamondArgs = chk.checkDiamondDenotable((ClassType)clazztype);
3034 if (!clazztype.isErroneous() && invalidDiamondArgs.nonEmpty()) {
3035 // One or more types inferred in the previous steps is non-denotable.
3036 Fragment fragment = Diamond(clazztype.tsym);
3037 log.error(tree.clazz.pos(),
3038 Errors.CantApplyDiamond1(
3039 fragment,
3040 invalidDiamondArgs.size() > 1 ?
3041 DiamondInvalidArgs(invalidDiamondArgs, fragment) :
3042 DiamondInvalidArg(invalidDiamondArgs, fragment)));
3043 }
3044 // For <>(){}, inferred types must also be accessible.
3045 for (Type t : clazztype.getTypeArguments()) {
3046 rs.checkAccessibleType(env, t);
3047 }
3048 }
3049
3050 // If we already errored, be careful to avoid a further avalanche. ErrorType answers
3051 // false for isInterface call even when the original type is an interface.
3052 boolean implementing = clazztype.tsym.isInterface() ||
3053 clazztype.isErroneous() && !clazztype.getOriginalType().hasTag(NONE) &&
3054 clazztype.getOriginalType().tsym.isInterface();
3055
3056 if (implementing) {
3057 cdef.implementing = List.of(clazz);
3058 } else {
3059 cdef.extending = clazz;
3060 }
3061
3062 if (resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3063 rs.isSerializable(clazztype)) {
3064 localEnv.info.isSerializable = true;
3065 }
3066
3067 attribStat(cdef, localEnv);
3068
3069 List<Type> finalargtypes;
3070 // If an outer instance is given,
3071 // prefix it to the constructor arguments
3072 // and delete it from the new expression
3073 if (tree.encl != null && !clazztype.tsym.isInterface()) {
3074 finalargtypes = argtypes.prepend(tree.encl.type);
3075 } else {
3076 finalargtypes = argtypes;
3077 }
3078
3079 // Reassign clazztype and recompute constructor. As this necessarily involves
3080 // another attribution pass for deferred types in the case of <>, replicate
3081 // them. Original arguments have right decorations already.
3082 if (isDiamond && pkind.contains(KindSelector.POLY)) {
3083 finalargtypes = finalargtypes.map(deferredAttr.deferredCopier);
3084 }
3085
3086 clazztype = clazztype.hasTag(ERROR) ? types.createErrorType(cdef.sym.type)
3087 : cdef.sym.type;
3088 Symbol sym = tree.constructor = rs.resolveConstructor(
3089 tree.pos(), localEnv, clazztype, finalargtypes, typeargtypes);
3090 Assert.check(!sym.kind.isResolutionError());
3091 tree.constructor = sym;
3092 tree.constructorType = checkId(tree,
3093 clazztype,
3094 tree.constructor,
3095 localEnv,
3096 new ResultInfo(pkind, newMethodTemplate(syms.voidType, finalargtypes, typeargtypes), CheckMode.NO_TREE_UPDATE));
3097 }
3098 Type owntype = (tree.constructor != null && tree.constructor.kind == MTH) ?
3099 clazztype : types.createErrorType(tree.type);
3100 result = check(tree, owntype, KindSelector.VAL, resultInfo.dup(CheckMode.NO_INFERENCE_HOOK));
3101 chk.validate(tree.typeargs, localEnv);
3102 }
3103
3104 CheckContext diamondContext(JCNewClass clazz, TypeSymbol tsym, CheckContext checkContext) {
3105 return new Check.NestedCheckContext(checkContext) {
3106 @Override
3107 public void report(DiagnosticPosition _unused, JCDiagnostic details) {
3108 enclosingContext.report(clazz.clazz,
3109 diags.fragment(Fragments.CantApplyDiamond1(Fragments.Diamond(tsym), details)));
3110 }
3111 };
3112 }
3113
3114 void checkNewInnerClass(DiagnosticPosition pos, Env<AttrContext> env, Type type, boolean isSuper) {
3115 boolean isLocal = type.tsym.owner.kind == VAR || type.tsym.owner.kind == MTH;
3116 if ((type.tsym.flags() & (INTERFACE | ENUM | RECORD)) != 0 ||
3117 (!isLocal && !type.tsym.isInner()) ||
3118 (isSuper && env.enclClass.sym.isAnonymous())) {
3119 // nothing to check
3120 return;
3121 }
3122 Symbol res = isLocal ?
3123 rs.findLocalClassOwner(env, type.tsym) :
3124 rs.findSelfContaining(pos, env, type.getEnclosingType().tsym, isSuper);
3125 if (res.exists()) {
3126 rs.accessBase(res, pos, env.enclClass.sym.type, names._this, true);
3127 } else {
3128 log.error(pos, Errors.EnclClassRequired(type.tsym));
3129 }
3130 }
3131
3132 /** Make an attributed null check tree.
3133 */
3134 public JCExpression makeNullCheck(JCExpression arg) {
3135 // optimization: new Outer() can never be null; skip null check
3136 if (arg.getTag() == NEWCLASS)
3137 return arg;
3138 // optimization: X.this is never null; skip null check
3139 Name name = TreeInfo.name(arg);
3140 if (name == names._this || name == names._super) return arg;
3141
3142 JCTree.Tag optag = NULLCHK;
3143 JCUnary tree = make.at(arg.pos).Unary(optag, arg);
3144 tree.operator = operators.resolveUnary(arg, optag, arg.type);
3145 tree.type = arg.type;
3146 return tree;
3147 }
3148
3149 public void visitNewArray(JCNewArray tree) {
3150 Type owntype = types.createErrorType(tree.type);
3151 Env<AttrContext> localEnv = env.dup(tree);
3152 Type elemtype;
3153 if (tree.elemtype != null) {
3154 elemtype = attribType(tree.elemtype, localEnv);
3155 chk.validate(tree.elemtype, localEnv);
3156 owntype = elemtype;
3157 for (List<JCExpression> l = tree.dims; l.nonEmpty(); l = l.tail) {
3158 attribExpr(l.head, localEnv, syms.intType);
3159 owntype = new ArrayType(owntype, syms.arrayClass);
3160 }
3161 } else {
3162 // we are seeing an untyped aggregate { ... }
3163 // this is allowed only if the prototype is an array
3164 if (pt().hasTag(ARRAY)) {
3165 elemtype = types.elemtype(pt());
3166 } else {
3167 if (!pt().hasTag(ERROR) &&
3168 (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3169 log.error(tree.pos(),
3170 Errors.IllegalInitializerForType(pt()));
3171 }
3172 elemtype = types.createErrorType(pt());
3173 }
3174 }
3175 if (tree.elems != null) {
3176 attribExprs(tree.elems, localEnv, elemtype);
3177 owntype = new ArrayType(elemtype, syms.arrayClass);
3178 }
3179 if (!types.isReifiable(elemtype))
3180 log.error(tree.pos(), Errors.GenericArrayCreation);
3181 result = check(tree, owntype, KindSelector.VAL, resultInfo);
3182 }
3183
3184 /*
3185 * A lambda expression can only be attributed when a target-type is available.
3186 * In addition, if the target-type is that of a functional interface whose
3187 * descriptor contains inference variables in argument position the lambda expression
3188 * is 'stuck' (see DeferredAttr).
3189 */
3190 @Override
3191 public void visitLambda(final JCLambda that) {
3192 boolean wrongContext = false;
3193 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
3194 if (pt().hasTag(NONE) && (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3195 //lambda only allowed in assignment or method invocation/cast context
3196 log.error(that.pos(), Errors.UnexpectedLambda);
3197 }
3198 resultInfo = recoveryInfo;
3199 wrongContext = true;
3200 }
3201 //create an environment for attribution of the lambda expression
3202 final Env<AttrContext> localEnv = lambdaEnv(that, env);
3203 boolean needsRecovery =
3204 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK;
3205 try {
3206 if (needsRecovery && rs.isSerializable(pt())) {
3207 localEnv.info.isSerializable = true;
3208 localEnv.info.isSerializableLambda = true;
3209 }
3210 List<Type> explicitParamTypes = null;
3211 if (that.paramKind == JCLambda.ParameterKind.EXPLICIT) {
3212 //attribute lambda parameters
3213 attribStats(that.params, localEnv);
3214 explicitParamTypes = TreeInfo.types(that.params);
3215 }
3216
3217 TargetInfo targetInfo = getTargetInfo(that, resultInfo, explicitParamTypes);
3218 Type currentTarget = targetInfo.target;
3219 Type lambdaType = targetInfo.descriptor;
3220
3221 if (currentTarget.isErroneous()) {
3222 result = that.type = currentTarget;
3223 return;
3224 }
3225
3226 setFunctionalInfo(localEnv, that, pt(), lambdaType, currentTarget, resultInfo.checkContext);
3227
3228 if (lambdaType.hasTag(FORALL)) {
3229 //lambda expression target desc cannot be a generic method
3230 Fragment msg = Fragments.InvalidGenericLambdaTarget(lambdaType,
3231 kindName(currentTarget.tsym),
3232 currentTarget.tsym);
3233 resultInfo.checkContext.report(that, diags.fragment(msg));
3234 result = that.type = types.createErrorType(pt());
3235 return;
3236 }
3237
3238 if (that.paramKind == JCLambda.ParameterKind.IMPLICIT) {
3239 //add param type info in the AST
3240 List<Type> actuals = lambdaType.getParameterTypes();
3241 List<JCVariableDecl> params = that.params;
3242
3243 boolean arityMismatch = false;
3244
3245 while (params.nonEmpty()) {
3246 if (actuals.isEmpty()) {
3247 //not enough actuals to perform lambda parameter inference
3248 arityMismatch = true;
3249 }
3250 //reset previously set info
3251 Type argType = arityMismatch ?
3252 syms.errType :
3253 actuals.head;
3254 if (params.head.type == null &&
3255 params.head.isImplicitlyTyped()) { //error recovery
3256 params.head.type = argType;
3257 setupImplicitlyTypedVariable(params.head, argType);
3258 }
3259 params.head.sym = null;
3260 actuals = actuals.isEmpty() ?
3261 actuals :
3262 actuals.tail;
3263 params = params.tail;
3264 }
3265
3266 //attribute lambda parameters
3267 attribStats(that.params, localEnv);
3268
3269 if (arityMismatch) {
3270 resultInfo.checkContext.report(that, diags.fragment(Fragments.WrongNumberArgsInLambda(currentTarget.tsym)));
3271 result = that.type = types.createErrorType(currentTarget);
3272 return;
3273 }
3274 }
3275
3276 //from this point on, no recovery is needed; if we are in assignment context
3277 //we will be able to attribute the whole lambda body, regardless of errors;
3278 //if we are in a 'check' method context, and the lambda is not compatible
3279 //with the target-type, it will be recovered anyway in Attr.checkId
3280 needsRecovery = false;
3281
3282 ResultInfo bodyResultInfo = localEnv.info.returnResult =
3283 lambdaBodyResult(that, lambdaType, resultInfo);
3284
3285 if (that.getBodyKind() == JCLambda.BodyKind.EXPRESSION) {
3286 attribTree(that.getBody(), localEnv, bodyResultInfo);
3287 } else {
3288 JCBlock body = (JCBlock)that.body;
3289
3290 checkBreakTree(body, localEnv);
3291 attribStats(body.stats, localEnv);
3292 }
3293
3294 result = check(that, currentTarget, KindSelector.VAL, resultInfo);
3295
3296 boolean isSpeculativeRound =
3297 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
3298
3299 preFlow(that);
3300 flow.analyzeLambda(env, that, make, isSpeculativeRound);
3301
3302 that.type = currentTarget; //avoids recovery at this stage
3303 checkLambdaCompatible(that, lambdaType, currentTarget.tsym, resultInfo.checkContext);
3304
3305 if (!isSpeculativeRound) {
3306 //add thrown types as bounds to the thrown types free variables if needed:
3307 if (resultInfo.checkContext.inferenceContext().free(lambdaType.getThrownTypes())) {
3308 List<Type> inferredThrownTypes = flow.analyzeLambdaThrownTypes(env, that, make);
3309 if(!checkExConstraints(inferredThrownTypes, lambdaType.getThrownTypes(), resultInfo.checkContext.inferenceContext())) {
3310 log.error(that, Errors.IncompatibleThrownTypesInMref(lambdaType.getThrownTypes()));
3311 }
3312 }
3313
3314 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), lambdaType, currentTarget);
3315 }
3316 result = wrongContext ? that.type = types.createErrorType(pt())
3317 : check(that, currentTarget, KindSelector.VAL, resultInfo);
3318 } catch (Types.FunctionDescriptorLookupError ex) {
3319 JCDiagnostic cause = ex.getDiagnostic();
3320 resultInfo.checkContext.report(that, cause);
3321 result = that.type = types.createErrorType(pt());
3322 return;
3323 } catch (CompletionFailure cf) {
3324 chk.completionError(that.pos(), cf);
3325 } catch (Throwable t) {
3326 //when an unexpected exception happens, avoid attempts to attribute the same tree again
3327 //as that would likely cause the same exception again.
3328 needsRecovery = false;
3329 throw t;
3330 } finally {
3331 localEnv.info.scope.leave();
3332 if (needsRecovery) {
3333 Type prevResult = result;
3334 try {
3335 attribTree(that, env, recoveryInfo);
3336 } finally {
3337 if (result == Type.recoveryType) {
3338 result = prevResult;
3339 }
3340 }
3341 }
3342 }
3343 }
3344 //where
3345 class TargetInfo {
3346 Type target;
3347 Type descriptor;
3348
3349 public TargetInfo(Type target, Type descriptor) {
3350 this.target = target;
3351 this.descriptor = descriptor;
3352 }
3353 }
3354
3355 TargetInfo getTargetInfo(JCPolyExpression that, ResultInfo resultInfo, List<Type> explicitParamTypes) {
3356 Type lambdaType;
3357 Type currentTarget = resultInfo.pt;
3358 if (resultInfo.pt != Type.recoveryType) {
3359 /* We need to adjust the target. If the target is an
3360 * intersection type, for example: SAM & I1 & I2 ...
3361 * the target will be updated to SAM
3362 */
3363 currentTarget = targetChecker.visit(currentTarget, that);
3364 if (!currentTarget.isIntersection()) {
3365 if (explicitParamTypes != null) {
3366 currentTarget = infer.instantiateFunctionalInterface(that,
3367 currentTarget, explicitParamTypes, resultInfo.checkContext);
3368 }
3369 currentTarget = types.removeWildcards(currentTarget);
3370 lambdaType = types.findDescriptorType(currentTarget);
3371 } else {
3372 IntersectionClassType ict = (IntersectionClassType)currentTarget;
3373 ListBuffer<Type> components = new ListBuffer<>();
3374 for (Type bound : ict.getExplicitComponents()) {
3375 if (explicitParamTypes != null) {
3376 try {
3377 bound = infer.instantiateFunctionalInterface(that,
3378 bound, explicitParamTypes, resultInfo.checkContext);
3379 } catch (FunctionDescriptorLookupError t) {
3380 // do nothing
3381 }
3382 }
3383 if (bound.tsym != syms.objectType.tsym && (!bound.isInterface() || (bound.tsym.flags() & ANNOTATION) != 0)) {
3384 // bound must be j.l.Object or an interface, but not an annotation
3385 reportIntersectionError(that, "not.an.intf.component", bound);
3386 }
3387 bound = types.removeWildcards(bound);
3388 components.add(bound);
3389 }
3390 currentTarget = types.makeIntersectionType(components.toList());
3391 currentTarget.tsym.flags_field |= INTERFACE;
3392 lambdaType = types.findDescriptorType(currentTarget);
3393 }
3394
3395 } else {
3396 currentTarget = Type.recoveryType;
3397 lambdaType = fallbackDescriptorType(that);
3398 }
3399 if (that.hasTag(LAMBDA) && lambdaType.hasTag(FORALL)) {
3400 //lambda expression target desc cannot be a generic method
3401 Fragment msg = Fragments.InvalidGenericLambdaTarget(lambdaType,
3402 kindName(currentTarget.tsym),
3403 currentTarget.tsym);
3404 resultInfo.checkContext.report(that, diags.fragment(msg));
3405 currentTarget = types.createErrorType(pt());
3406 }
3407 return new TargetInfo(currentTarget, lambdaType);
3408 }
3409
3410 private void reportIntersectionError(DiagnosticPosition pos, String key, Object... args) {
3411 resultInfo.checkContext.report(pos,
3412 diags.fragment(Fragments.BadIntersectionTargetForFunctionalExpr(diags.fragment(key, args))));
3413 }
3414
3415 void preFlow(JCLambda tree) {
3416 attrRecover.doRecovery();
3417 new PostAttrAnalyzer() {
3418 @Override
3419 public void scan(JCTree tree) {
3420 if (tree == null ||
3421 (tree.type != null &&
3422 tree.type == Type.stuckType)) {
3423 //don't touch stuck expressions!
3424 return;
3425 }
3426 super.scan(tree);
3427 }
3428
3429 @Override
3430 public void visitClassDef(JCClassDecl that) {
3431 // or class declaration trees!
3432 }
3433
3434 public void visitLambda(JCLambda that) {
3435 // or lambda expressions!
3436 }
3437 }.scan(tree.body);
3438 }
3439
3440 Types.MapVisitor<DiagnosticPosition> targetChecker = new Types.MapVisitor<DiagnosticPosition>() {
3441
3442 @Override
3443 public Type visitClassType(ClassType t, DiagnosticPosition pos) {
3444 return t.isIntersection() ?
3445 visitIntersectionClassType((IntersectionClassType)t, pos) : t;
3446 }
3447
3448 public Type visitIntersectionClassType(IntersectionClassType ict, DiagnosticPosition pos) {
3449 types.findDescriptorSymbol(makeNotionalInterface(ict, pos));
3450 return ict;
3451 }
3452
3453 private TypeSymbol makeNotionalInterface(IntersectionClassType ict, DiagnosticPosition pos) {
3454 ListBuffer<Type> targs = new ListBuffer<>();
3455 ListBuffer<Type> supertypes = new ListBuffer<>();
3456 for (Type i : ict.interfaces_field) {
3457 if (i.isParameterized()) {
3458 targs.appendList(i.tsym.type.allparams());
3459 }
3460 supertypes.append(i.tsym.type);
3461 }
3462 IntersectionClassType notionalIntf = types.makeIntersectionType(supertypes.toList());
3463 notionalIntf.allparams_field = targs.toList();
3464 notionalIntf.tsym.flags_field |= INTERFACE;
3465 return notionalIntf.tsym;
3466 }
3467 };
3468
3469 private Type fallbackDescriptorType(JCExpression tree) {
3470 switch (tree.getTag()) {
3471 case LAMBDA:
3472 JCLambda lambda = (JCLambda)tree;
3473 List<Type> argtypes = List.nil();
3474 for (JCVariableDecl param : lambda.params) {
3475 argtypes = !param.isImplicitlyTyped() && param.vartype.type != null ?
3476 argtypes.append(param.vartype.type) :
3477 argtypes.append(syms.errType);
3478 }
3479 return new MethodType(argtypes, Type.recoveryType,
3480 List.of(syms.throwableType), syms.methodClass);
3481 case REFERENCE:
3482 return new MethodType(List.nil(), Type.recoveryType,
3483 List.of(syms.throwableType), syms.methodClass);
3484 default:
3485 Assert.error("Cannot get here!");
3486 }
3487 return null;
3488 }
3489
3490 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
3491 final InferenceContext inferenceContext, final Type... ts) {
3492 checkAccessibleTypes(pos, env, inferenceContext, List.from(ts));
3493 }
3494
3495 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
3496 final InferenceContext inferenceContext, final List<Type> ts) {
3497 if (inferenceContext.free(ts)) {
3498 inferenceContext.addFreeTypeListener(ts,
3499 solvedContext -> checkAccessibleTypes(pos, env, solvedContext, solvedContext.asInstTypes(ts)));
3500 } else {
3501 for (Type t : ts) {
3502 rs.checkAccessibleType(env, t);
3503 }
3504 }
3505 }
3506
3507 /**
3508 * Lambda/method reference have a special check context that ensures
3509 * that i.e. a lambda return type is compatible with the expected
3510 * type according to both the inherited context and the assignment
3511 * context.
3512 */
3513 class FunctionalReturnContext extends Check.NestedCheckContext {
3514
3515 FunctionalReturnContext(CheckContext enclosingContext) {
3516 super(enclosingContext);
3517 }
3518
3519 @Override
3520 public boolean compatible(Type found, Type req, Warner warn) {
3521 //return type must be compatible in both current context and assignment context
3522 return chk.basicHandler.compatible(inferenceContext().asUndetVar(found), inferenceContext().asUndetVar(req), warn);
3523 }
3524
3525 @Override
3526 public void report(DiagnosticPosition pos, JCDiagnostic details) {
3527 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleRetTypeInLambda(details)));
3528 }
3529 }
3530
3531 class ExpressionLambdaReturnContext extends FunctionalReturnContext {
3532
3533 JCExpression expr;
3534 boolean expStmtExpected;
3535
3536 ExpressionLambdaReturnContext(JCExpression expr, CheckContext enclosingContext) {
3537 super(enclosingContext);
3538 this.expr = expr;
3539 }
3540
3541 @Override
3542 public void report(DiagnosticPosition pos, JCDiagnostic details) {
3543 if (expStmtExpected) {
3544 enclosingContext.report(pos, diags.fragment(Fragments.StatExprExpected));
3545 } else {
3546 super.report(pos, details);
3547 }
3548 }
3549
3550 @Override
3551 public boolean compatible(Type found, Type req, Warner warn) {
3552 //a void return is compatible with an expression statement lambda
3553 if (req.hasTag(VOID)) {
3554 expStmtExpected = true;
3555 return TreeInfo.isExpressionStatement(expr);
3556 } else {
3557 return super.compatible(found, req, warn);
3558 }
3559 }
3560 }
3561
3562 ResultInfo lambdaBodyResult(JCLambda that, Type descriptor, ResultInfo resultInfo) {
3563 FunctionalReturnContext funcContext = that.getBodyKind() == JCLambda.BodyKind.EXPRESSION ?
3564 new ExpressionLambdaReturnContext((JCExpression)that.getBody(), resultInfo.checkContext) :
3565 new FunctionalReturnContext(resultInfo.checkContext);
3566
3567 return descriptor.getReturnType() == Type.recoveryType ?
3568 recoveryInfo :
3569 new ResultInfo(KindSelector.VAL,
3570 descriptor.getReturnType(), funcContext);
3571 }
3572
3573 /**
3574 * Lambda compatibility. Check that given return types, thrown types, parameter types
3575 * are compatible with the expected functional interface descriptor. This means that:
3576 * (i) parameter types must be identical to those of the target descriptor; (ii) return
3577 * types must be compatible with the return type of the expected descriptor.
3578 */
3579 void checkLambdaCompatible(JCLambda tree, Type descriptor, TypeSymbol target, CheckContext checkContext) {
3580 Type returnType = checkContext.inferenceContext().asUndetVar(descriptor.getReturnType());
3581
3582 //return values have already been checked - but if lambda has no return
3583 //values, we must ensure that void/value compatibility is correct;
3584 //this amounts at checking that, if a lambda body can complete normally,
3585 //the descriptor's return type must be void
3586 if (tree.getBodyKind() == JCLambda.BodyKind.STATEMENT && tree.canCompleteNormally &&
3587 !returnType.hasTag(VOID) && returnType != Type.recoveryType) {
3588 Fragment msg =
3589 Fragments.IncompatibleRetTypeInLambda(Fragments.MissingRetVal(returnType));
3590 checkContext.report(tree,
3591 diags.fragment(msg));
3592 }
3593
3594 List<Type> argTypes = checkContext.inferenceContext().asUndetVars(descriptor.getParameterTypes());
3595 if (!types.isSameTypes(argTypes, TreeInfo.types(tree.params))) {
3596 checkContext.report(tree, diags.fragment(argTypes.size() != tree.params.size()
3597 ? Fragments.WrongNumberArgsInLambda(target)
3598 : Fragments.IncompatibleArgTypesInLambda(argTypes, TreeInfo.types(tree.params))));
3599 }
3600 }
3601
3602 /* This method returns an environment to be used to attribute a lambda
3603 * expression.
3604 *
3605 * The owner of this environment is a method symbol. If the current owner
3606 * is not a method (e.g. if the lambda occurs in a field initializer), then
3607 * a synthetic method symbol owner is created.
3608 */
3609 public Env<AttrContext> lambdaEnv(JCLambda that, Env<AttrContext> env) {
3610 Env<AttrContext> lambdaEnv;
3611 Symbol owner = env.info.scope.owner;
3612 if (owner.kind == VAR && owner.owner.kind == TYP) {
3613 // If the lambda is nested in a field initializer, we need to create a fake init method.
3614 // Uniqueness of this symbol is not important (as e.g. annotations will be added on the
3615 // init symbol's owner).
3616 ClassSymbol enclClass = owner.enclClass();
3617 Name initName = owner.isStatic() ? names.clinit : names.init;
3618 MethodSymbol initSym = new MethodSymbol(BLOCK | (owner.isStatic() ? STATIC : 0) | SYNTHETIC | PRIVATE,
3619 initName, initBlockType, enclClass);
3620 initSym.params = List.nil();
3621 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dupUnshared(initSym)));
3622 } else {
3623 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dup()));
3624 }
3625 lambdaEnv.info.yieldResult = null;
3626 lambdaEnv.info.isLambda = true;
3627 lambdaEnv.info.earlyContext = lambdaEnv.info.earlyContext.nested(false);
3628 return lambdaEnv;
3629 }
3630
3631 @Override
3632 public void visitReference(final JCMemberReference that) {
3633 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
3634 if (pt().hasTag(NONE) && (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3635 //method reference only allowed in assignment or method invocation/cast context
3636 log.error(that.pos(), Errors.UnexpectedMref);
3637 }
3638 result = that.type = types.createErrorType(pt());
3639 return;
3640 }
3641 final Env<AttrContext> localEnv = env.dup(that);
3642 try {
3643 //attribute member reference qualifier - if this is a constructor
3644 //reference, the expected kind must be a type
3645 Type exprType = attribTree(that.expr, env, memberReferenceQualifierResult(that));
3646
3647 if (that.getMode() == JCMemberReference.ReferenceMode.NEW) {
3648 exprType = chk.checkConstructorRefType(that.expr, exprType);
3649 if (!exprType.isErroneous() &&
3650 exprType.isRaw() &&
3651 that.typeargs != null) {
3652 log.error(that.expr.pos(),
3653 Errors.InvalidMref(Kinds.kindName(that.getMode()),
3654 Fragments.MrefInferAndExplicitParams));
3655 exprType = types.createErrorType(exprType);
3656 }
3657 }
3658
3659 if (exprType.isErroneous()) {
3660 //if the qualifier expression contains problems,
3661 //give up attribution of method reference
3662 result = that.type = exprType;
3663 return;
3664 }
3665
3666 if (TreeInfo.isStaticSelector(that.expr, names)) {
3667 //if the qualifier is a type, validate it; raw warning check is
3668 //omitted as we don't know at this stage as to whether this is a
3669 //raw selector (because of inference)
3670 chk.validate(that.expr, env, false);
3671 } else {
3672 Symbol lhsSym = TreeInfo.symbol(that.expr);
3673 localEnv.info.selectSuper = lhsSym != null && lhsSym.name == names._super;
3674 }
3675 //attrib type-arguments
3676 List<Type> typeargtypes = List.nil();
3677 if (that.typeargs != null) {
3678 typeargtypes = attribTypes(that.typeargs, localEnv);
3679 }
3680
3681 boolean isTargetSerializable =
3682 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3683 rs.isSerializable(pt());
3684 TargetInfo targetInfo = getTargetInfo(that, resultInfo, null);
3685 Type currentTarget = targetInfo.target;
3686 Type desc = targetInfo.descriptor;
3687
3688 setFunctionalInfo(localEnv, that, pt(), desc, currentTarget, resultInfo.checkContext);
3689 List<Type> argtypes = desc.getParameterTypes();
3690 Resolve.MethodCheck referenceCheck = rs.resolveMethodCheck;
3691
3692 if (resultInfo.checkContext.inferenceContext().free(argtypes)) {
3693 referenceCheck = rs.new MethodReferenceCheck(resultInfo.checkContext.inferenceContext());
3694 }
3695
3696 Pair<Symbol, Resolve.ReferenceLookupHelper> refResult = null;
3697 List<Type> saved_undet = resultInfo.checkContext.inferenceContext().save();
3698 try {
3699 refResult = rs.resolveMemberReference(localEnv, that, that.expr.type,
3700 that.name, argtypes, typeargtypes, targetInfo.descriptor, referenceCheck,
3701 resultInfo.checkContext.inferenceContext(), rs.basicReferenceChooser);
3702 } finally {
3703 resultInfo.checkContext.inferenceContext().rollback(saved_undet);
3704 }
3705
3706 Symbol refSym = refResult.fst;
3707 Resolve.ReferenceLookupHelper lookupHelper = refResult.snd;
3708
3709 /** this switch will need to go away and be replaced by the new RESOLUTION_TARGET testing
3710 * JDK-8075541
3711 */
3712 if (refSym.kind != MTH) {
3713 boolean targetError;
3714 switch (refSym.kind) {
3715 case ABSENT_MTH:
3716 targetError = false;
3717 break;
3718 case WRONG_MTH:
3719 case WRONG_MTHS:
3720 case AMBIGUOUS:
3721 case HIDDEN:
3722 case STATICERR:
3723 targetError = true;
3724 break;
3725 default:
3726 Assert.error("unexpected result kind " + refSym.kind);
3727 targetError = false;
3728 }
3729
3730 JCDiagnostic detailsDiag = ((Resolve.ResolveError)refSym.baseSymbol())
3731 .getDiagnostic(JCDiagnostic.DiagnosticType.FRAGMENT,
3732 that, exprType.tsym, exprType, that.name, argtypes, typeargtypes);
3733
3734 JCDiagnostic diag = diags.create(log.currentSource(), that,
3735 targetError ?
3736 Fragments.InvalidMref(Kinds.kindName(that.getMode()), detailsDiag) :
3737 Errors.InvalidMref(Kinds.kindName(that.getMode()), detailsDiag));
3738
3739 if (targetError && currentTarget == Type.recoveryType) {
3740 //a target error doesn't make sense during recovery stage
3741 //as we don't know what actual parameter types are
3742 result = that.type = currentTarget;
3743 return;
3744 } else {
3745 if (targetError) {
3746 resultInfo.checkContext.report(that, diag);
3747 } else {
3748 log.report(diag);
3749 }
3750 result = that.type = types.createErrorType(currentTarget);
3751 return;
3752 }
3753 }
3754
3755 that.sym = refSym.isConstructor() ? refSym.baseSymbol() : refSym;
3756 that.kind = lookupHelper.referenceKind(that.sym);
3757 that.ownerAccessible = rs.isAccessible(localEnv, that.sym.enclClass());
3758
3759 if (desc.getReturnType() == Type.recoveryType) {
3760 // stop here
3761 result = that.type = currentTarget;
3762 return;
3763 }
3764
3765 if (!env.info.attributionMode.isSpeculative && that.getMode() == JCMemberReference.ReferenceMode.NEW) {
3766 checkNewInnerClass(that.pos(), env, exprType, false);
3767 }
3768
3769 if (resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
3770
3771 if (that.getMode() == ReferenceMode.INVOKE &&
3772 TreeInfo.isStaticSelector(that.expr, names) &&
3773 that.kind.isUnbound() &&
3774 lookupHelper.site.isRaw()) {
3775 chk.checkRaw(that.expr, localEnv);
3776 }
3777
3778 if (that.sym.isStatic() && TreeInfo.isStaticSelector(that.expr, names) &&
3779 exprType.getTypeArguments().nonEmpty()) {
3780 //static ref with class type-args
3781 log.error(that.expr.pos(),
3782 Errors.InvalidMref(Kinds.kindName(that.getMode()),
3783 Fragments.StaticMrefWithTargs));
3784 result = that.type = types.createErrorType(currentTarget);
3785 return;
3786 }
3787
3788 if (!refSym.isStatic() && that.kind == JCMemberReference.ReferenceKind.SUPER) {
3789 // Check that super-qualified symbols are not abstract (JLS)
3790 rs.checkNonAbstract(that.pos(), that.sym);
3791 }
3792
3793 if (isTargetSerializable) {
3794 chk.checkAccessFromSerializableElement(that, true);
3795 }
3796 }
3797
3798 ResultInfo checkInfo =
3799 resultInfo.dup(newMethodTemplate(
3800 desc.getReturnType().hasTag(VOID) ? Type.noType : desc.getReturnType(),
3801 that.kind.isUnbound() ? argtypes.tail : argtypes, typeargtypes),
3802 new FunctionalReturnContext(resultInfo.checkContext), CheckMode.NO_TREE_UPDATE);
3803
3804 Type refType = checkId(that, lookupHelper.site, refSym, localEnv, checkInfo);
3805
3806 if (that.kind.isUnbound() &&
3807 resultInfo.checkContext.inferenceContext().free(argtypes.head)) {
3808 //re-generate inference constraints for unbound receiver
3809 if (!types.isSubtype(resultInfo.checkContext.inferenceContext().asUndetVar(argtypes.head), exprType)) {
3810 //cannot happen as this has already been checked - we just need
3811 //to regenerate the inference constraints, as that has been lost
3812 //as a result of the call to inferenceContext.save()
3813 Assert.error("Can't get here");
3814 }
3815 }
3816
3817 if (!refType.isErroneous()) {
3818 refType = types.createMethodTypeWithReturn(refType,
3819 adjustMethodReturnType(refSym, lookupHelper.site, that.name, checkInfo.pt.getParameterTypes(), refType.getReturnType()));
3820 }
3821
3822 //go ahead with standard method reference compatibility check - note that param check
3823 //is a no-op (as this has been taken care during method applicability)
3824 boolean isSpeculativeRound =
3825 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
3826
3827 that.type = currentTarget; //avoids recovery at this stage
3828 checkReferenceCompatible(that, desc, refType, resultInfo.checkContext, isSpeculativeRound);
3829 if (!isSpeculativeRound) {
3830 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), desc, currentTarget);
3831 }
3832 chk.checkRequiresIdentity(that, localEnv.info.lint);
3833 result = check(that, currentTarget, KindSelector.VAL, resultInfo);
3834 } catch (Types.FunctionDescriptorLookupError ex) {
3835 JCDiagnostic cause = ex.getDiagnostic();
3836 resultInfo.checkContext.report(that, cause);
3837 result = that.type = types.createErrorType(pt());
3838 return;
3839 }
3840 }
3841 //where
3842 ResultInfo memberReferenceQualifierResult(JCMemberReference tree) {
3843 //if this is a constructor reference, the expected kind must be a type
3844 return new ResultInfo(tree.getMode() == ReferenceMode.INVOKE ?
3845 KindSelector.VAL_TYP : KindSelector.TYP,
3846 Type.noType);
3847 }
3848
3849
3850 @SuppressWarnings("fallthrough")
3851 void checkReferenceCompatible(JCMemberReference tree, Type descriptor, Type refType, CheckContext checkContext, boolean speculativeAttr) {
3852 InferenceContext inferenceContext = checkContext.inferenceContext();
3853 Type returnType = inferenceContext.asUndetVar(descriptor.getReturnType());
3854
3855 Type resType;
3856 switch (tree.getMode()) {
3857 case NEW:
3858 if (!tree.expr.type.isRaw()) {
3859 resType = tree.expr.type;
3860 break;
3861 }
3862 default:
3863 resType = refType.getReturnType();
3864 }
3865
3866 Type incompatibleReturnType = resType;
3867
3868 if (returnType.hasTag(VOID)) {
3869 incompatibleReturnType = null;
3870 }
3871
3872 if (!returnType.hasTag(VOID) && !resType.hasTag(VOID)) {
3873 Type capturedResType = captureMRefReturnType ? types.capture(resType) : resType;
3874 if (resType.isErroneous() ||
3875 new FunctionalReturnContext(checkContext).compatible(capturedResType, returnType,
3876 checkContext.checkWarner(tree, capturedResType, returnType))) {
3877 incompatibleReturnType = null;
3878 }
3879 }
3880
3881 if (incompatibleReturnType != null) {
3882 Fragment msg =
3883 Fragments.IncompatibleRetTypeInMref(Fragments.InconvertibleTypes(resType, descriptor.getReturnType()));
3884 checkContext.report(tree, diags.fragment(msg));
3885 } else {
3886 if (inferenceContext.free(refType)) {
3887 // we need to wait for inference to finish and then replace inference vars in the referent type
3888 inferenceContext.addFreeTypeListener(List.of(refType),
3889 instantiatedContext -> {
3890 tree.referentType = instantiatedContext.asInstType(refType);
3891 });
3892 } else {
3893 tree.referentType = refType;
3894 }
3895 }
3896
3897 if (!speculativeAttr) {
3898 if (!checkExConstraints(refType.getThrownTypes(), descriptor.getThrownTypes(), inferenceContext)) {
3899 log.error(tree, Errors.IncompatibleThrownTypesInMref(refType.getThrownTypes()));
3900 }
3901 }
3902 }
3903
3904 boolean checkExConstraints(
3905 List<Type> thrownByFuncExpr,
3906 List<Type> thrownAtFuncType,
3907 InferenceContext inferenceContext) {
3908 /** 18.2.5: Otherwise, let E1, ..., En be the types in the function type's throws clause that
3909 * are not proper types
3910 */
3911 List<Type> nonProperList = thrownAtFuncType.stream()
3912 .filter(e -> inferenceContext.free(e)).collect(List.collector());
3913 List<Type> properList = thrownAtFuncType.diff(nonProperList);
3914
3915 /** Let X1,...,Xm be the checked exception types that the lambda body can throw or
3916 * in the throws clause of the invocation type of the method reference's compile-time
3917 * declaration
3918 */
3919 List<Type> checkedList = thrownByFuncExpr.stream()
3920 .filter(e -> chk.isChecked(e)).collect(List.collector());
3921
3922 /** If n = 0 (the function type's throws clause consists only of proper types), then
3923 * if there exists some i (1 <= i <= m) such that Xi is not a subtype of any proper type
3924 * in the throws clause, the constraint reduces to false; otherwise, the constraint
3925 * reduces to true
3926 */
3927 ListBuffer<Type> uncaughtByProperTypes = new ListBuffer<>();
3928 for (Type checked : checkedList) {
3929 boolean isSubtype = false;
3930 for (Type proper : properList) {
3931 if (types.isSubtype(checked, proper)) {
3932 isSubtype = true;
3933 break;
3934 }
3935 }
3936 if (!isSubtype) {
3937 uncaughtByProperTypes.add(checked);
3938 }
3939 }
3940
3941 if (nonProperList.isEmpty() && !uncaughtByProperTypes.isEmpty()) {
3942 return false;
3943 }
3944
3945 /** If n > 0, the constraint reduces to a set of subtyping constraints:
3946 * for all i (1 <= i <= m), if Xi is not a subtype of any proper type in the
3947 * throws clause, then the constraints include, for all j (1 <= j <= n), <Xi <: Ej>
3948 */
3949 List<Type> nonProperAsUndet = inferenceContext.asUndetVars(nonProperList);
3950 uncaughtByProperTypes.forEach(checkedEx -> {
3951 nonProperAsUndet.forEach(nonProper -> {
3952 types.isSubtype(checkedEx, nonProper);
3953 });
3954 });
3955
3956 /** In addition, for all j (1 <= j <= n), the constraint reduces to the bound throws Ej
3957 */
3958 nonProperAsUndet.stream()
3959 .filter(t -> t.hasTag(UNDETVAR))
3960 .forEach(t -> ((UndetVar)t).setThrow());
3961 return true;
3962 }
3963
3964 /**
3965 * Set functional type info on the underlying AST. Note: as the target descriptor
3966 * might contain inference variables, we might need to register an hook in the
3967 * current inference context.
3968 */
3969 private void setFunctionalInfo(final Env<AttrContext> env, final JCFunctionalExpression fExpr,
3970 final Type pt, final Type descriptorType, final Type primaryTarget, final CheckContext checkContext) {
3971 if (checkContext.inferenceContext().free(descriptorType)) {
3972 checkContext.inferenceContext().addFreeTypeListener(List.of(pt, descriptorType),
3973 inferenceContext -> setFunctionalInfo(env, fExpr, pt, inferenceContext.asInstType(descriptorType),
3974 inferenceContext.asInstType(primaryTarget), checkContext));
3975 } else {
3976 fExpr.owner = env.info.scope.owner;
3977 if (pt.hasTag(CLASS)) {
3978 fExpr.target = primaryTarget;
3979 }
3980 if (checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3981 pt != Type.recoveryType) {
3982 //check that functional interface class is well-formed
3983 try {
3984 /* Types.makeFunctionalInterfaceClass() may throw an exception
3985 * when it's executed post-inference. See the listener code
3986 * above.
3987 */
3988 ClassSymbol csym = types.makeFunctionalInterfaceClass(env,
3989 names.empty, fExpr.target, ABSTRACT);
3990 if (csym != null) {
3991 chk.checkImplementations(env.tree, csym, csym);
3992 try {
3993 //perform an additional functional interface check on the synthetic class,
3994 //as there may be spurious errors for raw targets - because of existing issues
3995 //with membership and inheritance (see JDK-8074570).
3996 csym.flags_field |= INTERFACE;
3997 types.findDescriptorType(csym.type);
3998 } catch (FunctionDescriptorLookupError err) {
3999 resultInfo.checkContext.report(fExpr,
4000 diags.fragment(Fragments.NoSuitableFunctionalIntfInst(fExpr.target)));
4001 }
4002 }
4003 } catch (Types.FunctionDescriptorLookupError ex) {
4004 JCDiagnostic cause = ex.getDiagnostic();
4005 resultInfo.checkContext.report(env.tree, cause);
4006 }
4007 }
4008 }
4009 }
4010
4011 public void visitParens(JCParens tree) {
4012 Type owntype = attribTree(tree.expr, env, resultInfo);
4013 result = check(tree, owntype, pkind(), resultInfo);
4014 Symbol sym = TreeInfo.symbol(tree);
4015 if (sym != null && sym.kind.matches(KindSelector.TYP_PCK) && sym.kind != Kind.ERR)
4016 log.error(tree.pos(), Errors.IllegalParenthesizedExpression);
4017 }
4018
4019 public void visitAssign(JCAssign tree) {
4020 Type owntype = attribTree(tree.lhs, env.dup(tree), varAssignmentInfo);
4021 Type capturedType = capture(owntype);
4022 attribExpr(tree.rhs, env, owntype);
4023 result = check(tree, capturedType, KindSelector.VAL, resultInfo);
4024 }
4025
4026 public void visitAssignop(JCAssignOp tree) {
4027 // Attribute arguments.
4028 Type owntype = attribTree(tree.lhs, env, varAssignmentOpInfo);
4029 Type operand = attribExpr(tree.rhs, env);
4030 // Find operator.
4031 Symbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag().noAssignOp(), owntype, operand);
4032 if (operator != operators.noOpSymbol &&
4033 !owntype.isErroneous() &&
4034 !operand.isErroneous()) {
4035 chk.checkDivZero(tree.rhs.pos(), operator, operand);
4036 chk.checkCastable(tree.rhs.pos(),
4037 operator.type.getReturnType(),
4038 owntype);
4039 switch (tree.getTag()) {
4040 case SL_ASG, SR_ASG, USR_ASG -> { } // we only use (at most) the lower 6 bits, so any integral type is OK
4041 default -> chk.checkLossOfPrecision(tree.rhs.pos(), operand, owntype);
4042 }
4043 chk.checkOutOfRangeShift(tree.rhs.pos(), operator, operand);
4044 }
4045 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4046 }
4047
4048 public void visitUnary(JCUnary tree) {
4049 // Attribute arguments.
4050 Type argtype = (tree.getTag().isIncOrDecUnaryOp())
4051 ? attribTree(tree.arg, env, varAssignmentOpInfo)
4052 : chk.checkNonVoid(tree.arg.pos(), attribExpr(tree.arg, env));
4053
4054 // Find operator.
4055 OperatorSymbol operator = tree.operator = operators.resolveUnary(tree, tree.getTag(), argtype);
4056 Type owntype = types.createErrorType(tree.type);
4057 if (operator != operators.noOpSymbol &&
4058 !argtype.isErroneous()) {
4059 owntype = (tree.getTag().isIncOrDecUnaryOp())
4060 ? tree.arg.type
4061 : operator.type.getReturnType();
4062 int opc = operator.opcode;
4063
4064 // If the argument is constant, fold it.
4065 if (argtype.constValue() != null) {
4066 Type ctype = cfolder.fold1(opc, argtype);
4067 if (ctype != null) {
4068 owntype = cfolder.coerce(ctype, owntype);
4069 }
4070 }
4071 }
4072 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4073 matchBindings = matchBindingsComputer.unary(tree, matchBindings);
4074 }
4075
4076 public void visitBinary(JCBinary tree) {
4077 // Attribute arguments.
4078 Type left = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.lhs, env));
4079 // x && y
4080 // include x's bindings when true in y
4081
4082 // x || y
4083 // include x's bindings when false in y
4084
4085 MatchBindings lhsBindings = matchBindings;
4086 List<BindingSymbol> propagatedBindings;
4087 switch (tree.getTag()) {
4088 case AND:
4089 propagatedBindings = lhsBindings.bindingsWhenTrue;
4090 break;
4091 case OR:
4092 propagatedBindings = lhsBindings.bindingsWhenFalse;
4093 break;
4094 default:
4095 propagatedBindings = List.nil();
4096 break;
4097 }
4098 Env<AttrContext> rhsEnv = bindingEnv(env, propagatedBindings);
4099 Type right;
4100 try {
4101 right = chk.checkNonVoid(tree.rhs.pos(), attribExpr(tree.rhs, rhsEnv));
4102 } finally {
4103 rhsEnv.info.scope.leave();
4104 }
4105
4106 matchBindings = matchBindingsComputer.binary(tree, lhsBindings, matchBindings);
4107
4108 // Find operator.
4109 OperatorSymbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag(), left, right);
4110 Type owntype = types.createErrorType(tree.type);
4111 if (operator != operators.noOpSymbol &&
4112 !left.isErroneous() &&
4113 !right.isErroneous()) {
4114 owntype = operator.type.getReturnType();
4115 int opc = operator.opcode;
4116 // If both arguments are constants, fold them.
4117 if (left.constValue() != null && right.constValue() != null) {
4118 Type ctype = cfolder.fold2(opc, left, right);
4119 if (ctype != null) {
4120 owntype = cfolder.coerce(ctype, owntype);
4121 }
4122 }
4123
4124 // Check that argument types of a reference ==, != are
4125 // castable to each other, (JLS 15.21). Note: unboxing
4126 // comparisons will not have an acmp* opc at this point.
4127 if ((opc == ByteCodes.if_acmpeq || opc == ByteCodes.if_acmpne)) {
4128 if (!types.isCastable(left, right, new Warner(tree.pos()))) {
4129 log.error(tree.pos(), Errors.IncomparableTypes(left, right));
4130 }
4131 }
4132
4133 chk.checkDivZero(tree.rhs.pos(), operator, right);
4134 chk.checkOutOfRangeShift(tree.rhs.pos(), operator, right);
4135 }
4136 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4137 }
4138
4139 public void visitTypeCast(final JCTypeCast tree) {
4140 Type clazztype = attribType(tree.clazz, env);
4141 chk.validate(tree.clazz, env, false);
4142 chk.checkRequiresIdentity(tree, env.info.lint);
4143 //a fresh environment is required for 292 inference to work properly ---
4144 //see Infer.instantiatePolymorphicSignatureInstance()
4145 Env<AttrContext> localEnv = env.dup(tree);
4146 //should we propagate the target type?
4147 final ResultInfo castInfo;
4148 JCExpression expr = TreeInfo.skipParens(tree.expr);
4149 boolean isPoly = (expr.hasTag(LAMBDA) || expr.hasTag(REFERENCE));
4150 if (isPoly) {
4151 //expression is a poly - we need to propagate target type info
4152 castInfo = new ResultInfo(KindSelector.VAL, clazztype,
4153 new Check.NestedCheckContext(resultInfo.checkContext) {
4154 @Override
4155 public boolean compatible(Type found, Type req, Warner warn) {
4156 return types.isCastable(found, req, warn);
4157 }
4158 });
4159 } else {
4160 //standalone cast - target-type info is not propagated
4161 castInfo = unknownExprInfo;
4162 }
4163 Type exprtype = attribTree(tree.expr, localEnv, castInfo);
4164 Type owntype = isPoly ? clazztype : chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
4165 if (exprtype.constValue() != null)
4166 owntype = cfolder.coerce(exprtype, owntype);
4167 result = check(tree, capture(owntype), KindSelector.VAL, resultInfo);
4168 if (!isPoly)
4169 chk.checkRedundantCast(localEnv, tree);
4170 }
4171
4172 public void visitTypeTest(JCInstanceOf tree) {
4173 Type exprtype = attribExpr(tree.expr, env);
4174 if (exprtype.isPrimitive()) {
4175 preview.checkSourceLevel(tree.expr.pos(), Feature.PRIMITIVE_PATTERNS);
4176 } else {
4177 exprtype = chk.checkNullOrRefType(
4178 tree.expr.pos(), exprtype);
4179 }
4180 Type clazztype;
4181 JCTree typeTree;
4182 if (tree.pattern.getTag() == BINDINGPATTERN ||
4183 tree.pattern.getTag() == RECORDPATTERN) {
4184 attribExpr(tree.pattern, env, exprtype);
4185 clazztype = tree.pattern.type;
4186 if (types.isSubtype(exprtype, clazztype) &&
4187 !exprtype.isErroneous() && !clazztype.isErroneous() &&
4188 tree.pattern.getTag() != RECORDPATTERN) {
4189 if (!allowUnconditionalPatternsInstanceOf) {
4190 log.error(tree.pos(), Feature.UNCONDITIONAL_PATTERN_IN_INSTANCEOF.error(this.sourceName));
4191 }
4192 }
4193 typeTree = TreeInfo.primaryPatternTypeTree((JCPattern) tree.pattern);
4194 } else {
4195 clazztype = attribType(tree.pattern, env);
4196 typeTree = tree.pattern;
4197 chk.validate(typeTree, env, false);
4198 }
4199 if (clazztype.isPrimitive()) {
4200 preview.checkSourceLevel(tree.pattern.pos(), Feature.PRIMITIVE_PATTERNS);
4201 } else {
4202 if (!clazztype.hasTag(TYPEVAR)) {
4203 clazztype = chk.checkClassOrArrayType(typeTree.pos(), clazztype);
4204 }
4205 if (!clazztype.isErroneous() && !types.isReifiable(clazztype)) {
4206 boolean valid = false;
4207 if (allowReifiableTypesInInstanceof) {
4208 valid = checkCastablePattern(tree.expr.pos(), exprtype, clazztype);
4209 } else {
4210 log.error(tree.pos(), Feature.REIFIABLE_TYPES_INSTANCEOF.error(this.sourceName));
4211 allowReifiableTypesInInstanceof = true;
4212 }
4213 if (!valid) {
4214 clazztype = types.createErrorType(clazztype);
4215 }
4216 }
4217 }
4218 chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
4219 result = check(tree, syms.booleanType, KindSelector.VAL, resultInfo);
4220 }
4221
4222 private boolean checkCastablePattern(DiagnosticPosition pos,
4223 Type exprType,
4224 Type pattType) {
4225 Warner warner = new Warner();
4226 // if any type is erroneous, the problem is reported elsewhere
4227 if (exprType.isErroneous() || pattType.isErroneous()) {
4228 return false;
4229 }
4230 if (!types.isCastable(exprType, pattType, warner)) {
4231 chk.basicHandler.report(pos,
4232 diags.fragment(Fragments.InconvertibleTypes(exprType, pattType)));
4233 return false;
4234 } else if ((exprType.isPrimitive() || pattType.isPrimitive()) &&
4235 (!exprType.isPrimitive() || !pattType.isPrimitive() || !types.isSameType(exprType, pattType))) {
4236 preview.checkSourceLevel(pos, Feature.PRIMITIVE_PATTERNS);
4237 return true;
4238 } else if (warner.hasLint(LintCategory.UNCHECKED)) {
4239 log.error(pos,
4240 Errors.InstanceofReifiableNotSafe(exprType, pattType));
4241 return false;
4242 } else {
4243 return true;
4244 }
4245 }
4246
4247 @Override
4248 public void visitAnyPattern(JCAnyPattern tree) {
4249 result = tree.type = resultInfo.pt;
4250 }
4251
4252 public void visitBindingPattern(JCBindingPattern tree) {
4253 Type type;
4254 if (!tree.var.isImplicitlyTyped()) {
4255 type = attribType(tree.var.vartype, env);
4256 } else {
4257 type = resultInfo.pt;
4258 }
4259 BindingSymbol v = new BindingSymbol(tree.var.mods.flags | tree.var.declKind.additionalSymbolFlags,
4260 tree.var.name, type, env.info.scope.owner);
4261 v.pos = tree.pos;
4262 tree.var.sym = v;
4263 if (chk.checkUnique(tree.var.pos(), v, env.info.scope)) {
4264 chk.checkTransparentVar(tree.var.pos(), v, env.info.scope);
4265 }
4266 if (tree.var.isImplicitlyTyped()) {
4267 setupImplicitlyTypedVariable(tree.var, type == Type.noType ? syms.errType
4268 : type);
4269 }
4270 chk.validate(tree.var.vartype, env, true);
4271 annotate.annotateLater(tree.var.mods.annotations, env, v);
4272 if (!tree.var.isImplicitlyTyped()) {
4273 annotate.queueScanTreeAndTypeAnnotate(tree.var.vartype, env, v);
4274 }
4275 annotate.flush();
4276 typeAnnotations.organizeTypeAnnotationsSignaturesForLocalVarType(env, tree.var);
4277 result = tree.type = tree.var.type = v.type;
4278 if (v.isUnnamedVariable()) {
4279 matchBindings = MatchBindingsComputer.EMPTY;
4280 } else {
4281 matchBindings = new MatchBindings(List.of(v), List.nil());
4282 }
4283 chk.checkRequiresIdentity(tree, env.info.lint);
4284 }
4285
4286 @Override
4287 public void visitRecordPattern(JCRecordPattern tree) {
4288 Type site;
4289
4290 if (tree.deconstructor.hasTag(VARTYPE)) {
4291 log.error(tree.pos(), Errors.DeconstructionPatternVarNotAllowed);
4292 tree.record = syms.errSymbol;
4293 site = tree.type = types.createErrorType(tree.record.type);
4294 } else {
4295 Type type = attribType(tree.deconstructor, env);
4296 if (type.isRaw() && type.tsym.getTypeParameters().nonEmpty()) {
4297 Type inferred = infer.instantiatePatternType(resultInfo.pt, type.tsym);
4298 if (inferred == null) {
4299 log.error(tree.pos(), Errors.PatternTypeCannotInfer);
4300 } else {
4301 type = inferred;
4302 }
4303 }
4304 tree.type = tree.deconstructor.type = type;
4305 site = types.capture(tree.type);
4306 chk.validate(tree.deconstructor, env, true);
4307 }
4308
4309 List<Type> expectedRecordTypes;
4310 if (site.tsym instanceof ClassSymbol clazz && clazz.isRecord()) {
4311 ClassSymbol record = (ClassSymbol) site.tsym;
4312 expectedRecordTypes = record.getRecordComponents()
4313 .stream()
4314 .map(rc -> types.memberType(site, rc))
4315 .map(t -> types.upward(t, types.captures(t)).baseType())
4316 .collect(List.collector());
4317 tree.record = record;
4318 } else {
4319 log.error(tree.pos(), Errors.DeconstructionPatternOnlyRecords(site.tsym));
4320 expectedRecordTypes = Stream.generate(() -> types.createErrorType(tree.type))
4321 .limit(tree.nested.size())
4322 .collect(List.collector());
4323 tree.record = syms.errSymbol;
4324 }
4325 ListBuffer<BindingSymbol> outBindings = new ListBuffer<>();
4326 List<Type> recordTypes = expectedRecordTypes;
4327 List<JCPattern> nestedPatterns = tree.nested;
4328 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
4329 try {
4330 while (recordTypes.nonEmpty() && nestedPatterns.nonEmpty()) {
4331 attribExpr(nestedPatterns.head, localEnv, recordTypes.head);
4332 checkCastablePattern(nestedPatterns.head.pos(), recordTypes.head, nestedPatterns.head.type);
4333 outBindings.addAll(matchBindings.bindingsWhenTrue);
4334 matchBindings.bindingsWhenTrue.forEach(localEnv.info.scope::enter);
4335 nestedPatterns = nestedPatterns.tail;
4336 recordTypes = recordTypes.tail;
4337 }
4338 if (recordTypes.nonEmpty() || nestedPatterns.nonEmpty()) {
4339 while (nestedPatterns.nonEmpty()) {
4340 attribExpr(nestedPatterns.head, localEnv, Type.noType);
4341 nestedPatterns = nestedPatterns.tail;
4342 }
4343 List<Type> nestedTypes =
4344 tree.nested.stream().map(p -> p.type).collect(List.collector());
4345 log.error(tree.pos(),
4346 Errors.IncorrectNumberOfNestedPatterns(expectedRecordTypes,
4347 nestedTypes));
4348 }
4349 } finally {
4350 localEnv.info.scope.leave();
4351 }
4352 result = tree.type;
4353 matchBindings = new MatchBindings(outBindings.toList(), List.nil());
4354 }
4355
4356 public void visitIndexed(JCArrayAccess tree) {
4357 Type owntype = types.createErrorType(tree.type);
4358 Type atype = attribExpr(tree.indexed, env);
4359 attribExpr(tree.index, env, syms.intType);
4360 if (types.isArray(atype))
4361 owntype = types.elemtype(atype);
4362 else if (!atype.hasTag(ERROR))
4363 log.error(tree.pos(), Errors.ArrayReqButFound(atype));
4364 if (!pkind().contains(KindSelector.VAL))
4365 owntype = capture(owntype);
4366 result = check(tree, owntype, KindSelector.VAR, resultInfo);
4367 }
4368
4369 public void visitIdent(JCIdent tree) {
4370 Symbol sym;
4371
4372 // Find symbol
4373 if (pt().hasTag(METHOD) || pt().hasTag(FORALL)) {
4374 // If we are looking for a method, the prototype `pt' will be a
4375 // method type with the type of the call's arguments as parameters.
4376 env.info.pendingResolutionPhase = null;
4377 sym = rs.resolveMethod(tree.pos(), env, tree.name, pt().getParameterTypes(), pt().getTypeArguments());
4378 } else if (tree.sym != null && tree.sym.kind != VAR) {
4379 sym = tree.sym;
4380 } else {
4381 sym = rs.resolveIdent(tree.pos(), env, tree.name, pkind());
4382 }
4383 tree.sym = sym;
4384
4385 // Also find the environment current for the class where
4386 // sym is defined (`symEnv').
4387 Env<AttrContext> symEnv = env;
4388 if (env.enclClass.sym.owner.kind != PCK && // we are in an inner class
4389 sym.kind.matches(KindSelector.VAL_MTH) &&
4390 sym.owner.kind == TYP &&
4391 tree.name != names._this && tree.name != names._super) {
4392
4393 // Find environment in which identifier is defined.
4394 while (symEnv.outer != null &&
4395 !sym.isMemberOf(symEnv.enclClass.sym, types)) {
4396 symEnv = symEnv.outer;
4397 }
4398 }
4399
4400 // If symbol is a variable, ...
4401 if (sym.kind == VAR) {
4402 VarSymbol v = (VarSymbol)sym;
4403
4404 // ..., evaluate its initializer, if it has one, and check for
4405 // illegal forward reference.
4406 checkInit(tree, env, v, false);
4407
4408 // If we are expecting a variable (as opposed to a value), check
4409 // that the variable is assignable in the current environment.
4410 if (KindSelector.ASG.subset(pkind()))
4411 checkAssignable(tree.pos(), v, null, env);
4412 }
4413
4414 Env<AttrContext> env1 = env;
4415 if (sym.kind != ERR && sym.kind != TYP &&
4416 sym.owner != null && sym.owner != env1.enclClass.sym) {
4417 // If the found symbol is inaccessible, then it is
4418 // accessed through an enclosing instance. Locate this
4419 // enclosing instance:
4420 while (env1.outer != null && !rs.isAccessible(env, env1.enclClass.sym.type, sym))
4421 env1 = env1.outer;
4422 }
4423
4424 if (env.info.isSerializable) {
4425 chk.checkAccessFromSerializableElement(tree, env.info.isSerializableLambda);
4426 }
4427
4428 result = checkId(tree, env1.enclClass.sym.type, sym, env, resultInfo);
4429 }
4430
4431 public void visitSelect(JCFieldAccess tree) {
4432 // Determine the expected kind of the qualifier expression.
4433 KindSelector skind = KindSelector.NIL;
4434 if (tree.name == names._this || tree.name == names._super ||
4435 tree.name == names._class)
4436 {
4437 skind = KindSelector.TYP;
4438 } else {
4439 if (pkind().contains(KindSelector.PCK))
4440 skind = KindSelector.of(skind, KindSelector.PCK);
4441 if (pkind().contains(KindSelector.TYP))
4442 skind = KindSelector.of(skind, KindSelector.TYP, KindSelector.PCK);
4443 if (pkind().contains(KindSelector.VAL_MTH))
4444 skind = KindSelector.of(skind, KindSelector.VAL, KindSelector.TYP);
4445 }
4446
4447 // Attribute the qualifier expression, and determine its symbol (if any).
4448 Type site;
4449 EarlyConstructionContext earlyConstructionPrev = env.info.earlyContext;
4450 JCTree earlyFieldQualifier = earlyFieldQualifier(tree);
4451 try {
4452 if (earlyFieldQualifier != null) {
4453 // if we're seeing a likely field access, and qualifier is this/super,
4454 // pretend we're not in early construction context. This allows Resolve
4455 // to skip premature checks against this/super
4456 env.info.earlyContext = EarlyConstructionContext.NONE;
4457 }
4458 site = attribTree(tree.selected, env, new ResultInfo(skind, Type.noType));
4459 } finally {
4460 env.info.earlyContext = earlyConstructionPrev;
4461 }
4462 Assert.check(site == tree.selected.type);
4463 if (!pkind().contains(KindSelector.TYP_PCK))
4464 site = capture(site); // Capture field access
4465
4466 // don't allow T.class T[].class, etc
4467 if (skind == KindSelector.TYP) {
4468 Type elt = site;
4469 while (elt.hasTag(ARRAY))
4470 elt = ((ArrayType)elt).elemtype;
4471 if (elt.hasTag(TYPEVAR)) {
4472 log.error(tree.pos(), Errors.TypeVarCantBeDeref);
4473 result = tree.type = types.createErrorType(tree.name, site.tsym, site);
4474 tree.sym = tree.type.tsym;
4475 return ;
4476 }
4477 }
4478
4479 // If qualifier symbol is a type or `super', assert `selectSuper'
4480 // for the selection. This is relevant for determining whether
4481 // protected symbols are accessible.
4482 Symbol sitesym = TreeInfo.symbol(tree.selected);
4483 boolean selectSuperPrev = env.info.selectSuper;
4484 env.info.selectSuper =
4485 sitesym != null &&
4486 sitesym.name == names._super;
4487
4488 // Determine the symbol represented by the selection.
4489 env.info.pendingResolutionPhase = null;
4490 Symbol sym;
4491 sym = selectSym(tree, sitesym, site, env, resultInfo, earlyFieldQualifier);
4492 if (sym.kind == VAR && sym.name != names._super && env.info.defaultSuperCallSite != null) {
4493 log.error(tree.selected.pos(), Errors.NotEnclClass(site.tsym));
4494 sym = syms.errSymbol;
4495 }
4496 if (sym.exists() && !isType(sym) &&
4497 tree.name != names._this && tree.name != names._super &&
4498 pkind().contains(KindSelector.TYP_PCK)) {
4499 site = capture(site);
4500 sym = selectSym(tree, sitesym, site, env, resultInfo, earlyFieldQualifier);
4501 }
4502 boolean varArgs = env.info.lastResolveVarargs();
4503 tree.sym = sym;
4504
4505 if (site.hasTag(TYPEVAR) && !isType(sym) && sym.kind != ERR) {
4506 site = types.skipTypeVars(site, true);
4507 }
4508
4509 // If that symbol is a variable, ...
4510 if (sym.kind == VAR) {
4511 VarSymbol v = (VarSymbol)sym;
4512
4513 // ..., evaluate its initializer, if it has one, and check for
4514 // illegal forward reference.
4515 checkInit(tree, env, v, true);
4516
4517 // If we are expecting a variable (as opposed to a value), check
4518 // that the variable is assignable in the current environment.
4519 if (KindSelector.ASG.subset(pkind()))
4520 checkAssignable(tree.pos(), v, tree.selected, env);
4521 }
4522
4523 if (sitesym != null &&
4524 sitesym.kind == VAR &&
4525 ((VarSymbol)sitesym).isResourceVariable() &&
4526 sym.kind == MTH &&
4527 sym.name.equals(names.close) &&
4528 sym.overrides(syms.autoCloseableClose, sitesym.type.tsym, types, true)) {
4529 log.warning(tree, LintWarnings.TryExplicitCloseCall);
4530 }
4531
4532 // Disallow selecting a type from an expression
4533 if (isType(sym) && (sitesym == null || !sitesym.kind.matches(KindSelector.TYP_PCK))) {
4534 tree.type = check(tree.selected, pt(),
4535 sitesym == null ?
4536 KindSelector.VAL : sitesym.kind.toSelector(),
4537 new ResultInfo(KindSelector.TYP_PCK, pt()));
4538 }
4539
4540 if (isType(sitesym)) {
4541 if (sym.name != names._this && sym.name != names._super) {
4542 // Check if type-qualified fields or methods are static (JLS)
4543 if ((sym.flags() & STATIC) == 0 &&
4544 sym.name != names._super &&
4545 (sym.kind == VAR || sym.kind == MTH)) {
4546 rs.accessBase(rs.new StaticError(sym),
4547 tree.pos(), site, sym.name, true);
4548 }
4549 }
4550 } else if (sym.kind != ERR &&
4551 (sym.flags() & STATIC) != 0 &&
4552 sym.name != names._class) {
4553 // If the qualified item is not a type and the selected item is static, report
4554 // a warning. Make allowance for the class of an array type e.g. Object[].class)
4555 if (!sym.owner.isAnonymous()) {
4556 log.warning(tree, LintWarnings.StaticNotQualifiedByType(sym.kind.kindName(), sym.owner));
4557 } else {
4558 log.warning(tree, LintWarnings.StaticNotQualifiedByType2(sym.kind.kindName()));
4559 }
4560 }
4561
4562 // If we are selecting an instance member via a `super', ...
4563 if (env.info.selectSuper && (sym.flags() & STATIC) == 0) {
4564
4565 // Check that super-qualified symbols are not abstract (JLS)
4566 rs.checkNonAbstract(tree.pos(), sym);
4567
4568 if (site.isRaw()) {
4569 // Determine argument types for site.
4570 Type site1 = types.asSuper(env.enclClass.sym.type, site.tsym);
4571 if (site1 != null) site = site1;
4572 }
4573 }
4574
4575 if (env.info.isSerializable) {
4576 chk.checkAccessFromSerializableElement(tree, env.info.isSerializableLambda);
4577 }
4578
4579 env.info.selectSuper = selectSuperPrev;
4580 result = checkId(tree, site, sym, env, resultInfo);
4581 }
4582
4583 private JCTree earlyFieldQualifier(JCFieldAccess tree) {
4584 boolean methodSelect = resultInfo.pt.hasTag(METHOD) || resultInfo.pt.hasTag(FORALL);
4585 if (!methodSelect &&
4586 (TreeInfo.isThisOrSelectorDotThis(tree.selected) ||
4587 TreeInfo.isSuperOrSelectorDotSuper(tree.selected))) {
4588 return tree.selected;
4589 }
4590 return null;
4591 }
4592
4593 //where
4594 /** Determine symbol referenced by a Select expression,
4595 *
4596 * @param tree The select tree.
4597 * @param site The type of the selected expression,
4598 * @param env The current environment.
4599 * @param resultInfo The current result.
4600 */
4601 private Symbol selectSym(JCFieldAccess tree,
4602 Symbol location,
4603 Type site,
4604 Env<AttrContext> env,
4605 ResultInfo resultInfo,
4606 JCTree earlyFieldQualifier) {
4607 DiagnosticPosition pos = tree.pos();
4608 Name name = tree.name;
4609 switch (site.getTag()) {
4610 case PACKAGE:
4611 return rs.accessBase(
4612 rs.findIdentInPackage(pos, env, site.tsym, name, resultInfo.pkind),
4613 pos, location, site, name, true);
4614 case ARRAY:
4615 case CLASS:
4616 if (resultInfo.pt.hasTag(METHOD) || resultInfo.pt.hasTag(FORALL)) {
4617 return rs.resolveQualifiedMethod(
4618 pos, env, location, site, name, resultInfo.pt.getParameterTypes(), resultInfo.pt.getTypeArguments());
4619 } else if (name == names._this || name == names._super) {
4620 Symbol sym = rs.resolveSelf(pos, env, site.tsym, tree);
4621 return rs.accessBase(sym, pos, env.enclClass.sym.type, name, true);
4622 } else if (name == names._class) {
4623 // In this case, we have already made sure in
4624 // visitSelect that qualifier expression is a type.
4625 return syms.getClassField(site, types);
4626 } else {
4627 // We are seeing a plain identifier as selector.
4628 Symbol sym = rs.findIdentInType(pos, env, site, name, resultInfo.pkind, earlyFieldQualifier);
4629 sym = rs.accessBase(sym, pos, location, site, name, true);
4630 return sym;
4631 }
4632 case WILDCARD:
4633 throw new AssertionError(tree);
4634 case TYPEVAR:
4635 // Normally, site.getUpperBound() shouldn't be null.
4636 // It should only happen during memberEnter/attribBase
4637 // when determining the supertype which *must* be
4638 // done before attributing the type variables. In
4639 // other words, we are seeing this illegal program:
4640 // class B<T> extends A<T.foo> {}
4641 Symbol sym = (site.getUpperBound() != null)
4642 ? selectSym(tree, location, capture(site.getUpperBound()), env, resultInfo, earlyFieldQualifier)
4643 : null;
4644 if (sym == null) {
4645 log.error(pos, Errors.TypeVarCantBeDeref);
4646 return syms.errSymbol;
4647 } else {
4648 // JLS 4.9 specifies the members are derived by inheritance.
4649 // We skip inducing a whole class by filtering members that
4650 // can never be inherited:
4651 Symbol sym2;
4652 if (sym.isPrivate()) {
4653 // Private members
4654 sym2 = rs.new AccessError(env, site, sym);
4655 } else if (sym.owner.isInterface() && sym.kind == MTH && (sym.flags() & STATIC) != 0) {
4656 // Interface static methods
4657 sym2 = rs.new SymbolNotFoundError(ABSENT_MTH);
4658 } else {
4659 sym2 = sym;
4660 }
4661 rs.accessBase(sym2, pos, location, site, name, true);
4662 return sym;
4663 }
4664 case ERROR:
4665 // preserve identifier names through errors
4666 return types.createErrorType(name, site.tsym, site).tsym;
4667 default:
4668 // The qualifier expression is of a primitive type -- only
4669 // .class is allowed for these.
4670 if (name == names._class) {
4671 // In this case, we have already made sure in Select that
4672 // qualifier expression is a type.
4673 return syms.getClassField(site, types);
4674 } else {
4675 log.error(pos, Errors.CantDeref(site));
4676 return syms.errSymbol;
4677 }
4678 }
4679 }
4680
4681 /** Determine type of identifier or select expression and check that
4682 * (1) the referenced symbol is not deprecated
4683 * (2) the symbol's type is safe (@see checkSafe)
4684 * (3) if symbol is a variable, check that its type and kind are
4685 * compatible with the prototype and protokind.
4686 * (4) if symbol is an instance field of a raw type,
4687 * which is being assigned to, issue an unchecked warning if its
4688 * type changes under erasure.
4689 * (5) if symbol is an instance method of a raw type, issue an
4690 * unchecked warning if its argument types change under erasure.
4691 * If checks succeed:
4692 * If symbol is a constant, return its constant type
4693 * else if symbol is a method, return its result type
4694 * otherwise return its type.
4695 * Otherwise return errType.
4696 *
4697 * @param tree The syntax tree representing the identifier
4698 * @param site If this is a select, the type of the selected
4699 * expression, otherwise the type of the current class.
4700 * @param sym The symbol representing the identifier.
4701 * @param env The current environment.
4702 * @param resultInfo The expected result
4703 */
4704 Type checkId(JCTree tree,
4705 Type site,
4706 Symbol sym,
4707 Env<AttrContext> env,
4708 ResultInfo resultInfo) {
4709 return (resultInfo.pt.hasTag(FORALL) || resultInfo.pt.hasTag(METHOD)) ?
4710 checkMethodIdInternal(tree, site, sym, env, resultInfo) :
4711 checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
4712 }
4713
4714 Type checkMethodIdInternal(JCTree tree,
4715 Type site,
4716 Symbol sym,
4717 Env<AttrContext> env,
4718 ResultInfo resultInfo) {
4719 if (resultInfo.pkind.contains(KindSelector.POLY)) {
4720 return attrRecover.recoverMethodInvocation(tree, site, sym, env, resultInfo);
4721 } else {
4722 return checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
4723 }
4724 }
4725
4726 Type checkIdInternal(JCTree tree,
4727 Type site,
4728 Symbol sym,
4729 Type pt,
4730 Env<AttrContext> env,
4731 ResultInfo resultInfo) {
4732 Type owntype; // The computed type of this identifier occurrence.
4733 switch (sym.kind) {
4734 case TYP:
4735 // For types, the computed type equals the symbol's type,
4736 // except for two situations:
4737 owntype = sym.type;
4738 if (owntype.hasTag(CLASS)) {
4739 chk.checkForBadAuxiliaryClassAccess(tree.pos(), env, (ClassSymbol)sym);
4740 Type ownOuter = owntype.getEnclosingType();
4741
4742 // (a) If the symbol's type is parameterized, erase it
4743 // because no type parameters were given.
4744 // We recover generic outer type later in visitTypeApply.
4745 if (owntype.tsym.type.getTypeArguments().nonEmpty()) {
4746 owntype = types.erasure(owntype);
4747 }
4748
4749 // (b) If the symbol's type is an inner class, then
4750 // we have to interpret its outer type as a superclass
4751 // of the site type. Example:
4752 //
4753 // class Tree<A> { class Visitor { ... } }
4754 // class PointTree extends Tree<Point> { ... }
4755 // ...PointTree.Visitor...
4756 //
4757 // Then the type of the last expression above is
4758 // Tree<Point>.Visitor.
4759 else if ((ownOuter.hasTag(CLASS) || ownOuter.hasTag(TYPEVAR)) && site != ownOuter) {
4760 Type normOuter = types.asEnclosingSuper(site, ownOuter.tsym);
4761 if (normOuter == null) // perhaps from an import
4762 normOuter = types.erasure(ownOuter);
4763 if (normOuter != ownOuter)
4764 owntype = new ClassType(
4765 normOuter, List.nil(), owntype.tsym,
4766 owntype.getMetadata());
4767 }
4768 }
4769 break;
4770 case VAR:
4771 VarSymbol v = (VarSymbol)sym;
4772
4773 if (env.info.enclVar != null
4774 && v.type.hasTag(NONE)) {
4775 //self reference to implicitly typed variable declaration
4776 log.error(TreeInfo.positionFor(v, env.enclClass), Errors.CantInferLocalVarType(v.name, Fragments.LocalSelfRef));
4777 return tree.type = v.type = types.createErrorType(v.type);
4778 }
4779
4780 // Test (4): if symbol is an instance field of a raw type,
4781 // which is being assigned to, issue an unchecked warning if
4782 // its type changes under erasure.
4783 if (KindSelector.ASG.subset(pkind()) &&
4784 v.owner.kind == TYP &&
4785 (v.flags() & STATIC) == 0 &&
4786 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
4787 Type s = types.asOuterSuper(site, v.owner);
4788 if (s != null &&
4789 s.isRaw() &&
4790 !types.isSameType(v.type, v.erasure(types))) {
4791 chk.warnUnchecked(tree.pos(), LintWarnings.UncheckedAssignToVar(v, s));
4792 }
4793 }
4794 // The computed type of a variable is the type of the
4795 // variable symbol, taken as a member of the site type.
4796 owntype = (sym.owner.kind == TYP &&
4797 sym.name != names._this && sym.name != names._super)
4798 ? types.memberType(site, sym)
4799 : sym.type;
4800
4801 // If the variable is a constant, record constant value in
4802 // computed type.
4803 if (v.getConstValue() != null && isStaticReference(tree))
4804 owntype = owntype.constType(v.getConstValue());
4805
4806 if (resultInfo.pkind == KindSelector.VAL) {
4807 owntype = capture(owntype); // capture "names as expressions"
4808 }
4809 break;
4810 case MTH: {
4811 owntype = checkMethod(site, sym,
4812 new ResultInfo(resultInfo.pkind, resultInfo.pt.getReturnType(), resultInfo.checkContext, resultInfo.checkMode),
4813 env, TreeInfo.args(env.tree), resultInfo.pt.getParameterTypes(),
4814 resultInfo.pt.getTypeArguments());
4815 chk.checkRestricted(tree.pos(), sym);
4816 break;
4817 }
4818 case PCK: case ERR:
4819 owntype = sym.type;
4820 break;
4821 default:
4822 throw new AssertionError("unexpected kind: " + sym.kind +
4823 " in tree " + tree);
4824 }
4825
4826 // Emit a `deprecation' warning if symbol is deprecated.
4827 // (for constructors (but not for constructor references), the error
4828 // was given when the constructor was resolved)
4829
4830 if (sym.name != names.init || tree.hasTag(REFERENCE)) {
4831 chk.checkDeprecated(tree.pos(), env.info.scope.owner, sym);
4832 chk.checkSunAPI(tree.pos(), sym);
4833 chk.checkProfile(tree.pos(), sym);
4834 chk.checkPreview(tree.pos(), env.info.scope.owner, site, sym);
4835 }
4836
4837 if (pt.isErroneous()) {
4838 owntype = types.createErrorType(owntype);
4839 }
4840
4841 // If symbol is a variable, check that its type and
4842 // kind are compatible with the prototype and protokind.
4843 return check(tree, owntype, sym.kind.toSelector(), resultInfo);
4844 }
4845
4846 /** Check that variable is initialized and evaluate the variable's
4847 * initializer, if not yet done. Also check that variable is not
4848 * referenced before it is defined.
4849 * @param tree The tree making up the variable reference.
4850 * @param env The current environment.
4851 * @param v The variable's symbol.
4852 */
4853 private void checkInit(JCTree tree,
4854 Env<AttrContext> env,
4855 VarSymbol v,
4856 boolean onlyWarning) {
4857 // A forward reference is diagnosed if the declaration position
4858 // of the variable is greater than the current tree position
4859 // and the tree and variable definition occur in the same class
4860 // definition. Note that writes don't count as references.
4861 // This check applies only to class and instance
4862 // variables. Local variables follow different scope rules,
4863 // and are subject to definite assignment checking.
4864 Env<AttrContext> initEnv = enclosingInitEnv(env);
4865 if (initEnv != null &&
4866 (initEnv.info.enclVar == v || v.pos > tree.pos) &&
4867 v.owner.kind == TYP &&
4868 v.owner == env.info.scope.owner.enclClass() &&
4869 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env) &&
4870 (!env.tree.hasTag(ASSIGN) ||
4871 TreeInfo.skipParens(((JCAssign) env.tree).lhs) != tree)) {
4872 if (!onlyWarning || isStaticEnumField(v)) {
4873 Error errkey = (initEnv.info.enclVar == v) ?
4874 Errors.IllegalSelfRef : Errors.IllegalForwardRef;
4875 log.error(tree.pos(), errkey);
4876 } else if (useBeforeDeclarationWarning) {
4877 Warning warnkey = (initEnv.info.enclVar == v) ?
4878 Warnings.SelfRef(v) : Warnings.ForwardRef(v);
4879 log.warning(tree.pos(), warnkey);
4880 }
4881 }
4882
4883 v.getConstValue(); // ensure initializer is evaluated
4884
4885 checkEnumInitializer(tree, env, v);
4886 }
4887
4888 /**
4889 * Returns the enclosing init environment associated with this env (if any). An init env
4890 * can be either a field declaration env or a static/instance initializer env.
4891 */
4892 Env<AttrContext> enclosingInitEnv(Env<AttrContext> env) {
4893 while (true) {
4894 switch (env.tree.getTag()) {
4895 case VARDEF:
4896 JCVariableDecl vdecl = (JCVariableDecl)env.tree;
4897 if (vdecl.sym.owner.kind == TYP) {
4898 //field
4899 return env;
4900 }
4901 break;
4902 case BLOCK:
4903 if (env.next.tree.hasTag(CLASSDEF)) {
4904 //instance/static initializer
4905 return env;
4906 }
4907 break;
4908 case METHODDEF:
4909 case CLASSDEF:
4910 case TOPLEVEL:
4911 return null;
4912 }
4913 Assert.checkNonNull(env.next);
4914 env = env.next;
4915 }
4916 }
4917
4918 /**
4919 * Check for illegal references to static members of enum. In
4920 * an enum type, constructors and initializers may not
4921 * reference its static members unless they are constant.
4922 *
4923 * @param tree The tree making up the variable reference.
4924 * @param env The current environment.
4925 * @param v The variable's symbol.
4926 * @jls 8.9 Enum Types
4927 */
4928 private void checkEnumInitializer(JCTree tree, Env<AttrContext> env, VarSymbol v) {
4929 // JLS:
4930 //
4931 // "It is a compile-time error to reference a static field
4932 // of an enum type that is not a compile-time constant
4933 // (15.28) from constructors, instance initializer blocks,
4934 // or instance variable initializer expressions of that
4935 // type. It is a compile-time error for the constructors,
4936 // instance initializer blocks, or instance variable
4937 // initializer expressions of an enum constant e to refer
4938 // to itself or to an enum constant of the same type that
4939 // is declared to the right of e."
4940 if (isStaticEnumField(v)) {
4941 ClassSymbol enclClass = env.info.scope.owner.enclClass();
4942
4943 if (enclClass == null || enclClass.owner == null)
4944 return;
4945
4946 // See if the enclosing class is the enum (or a
4947 // subclass thereof) declaring v. If not, this
4948 // reference is OK.
4949 if (v.owner != enclClass && !types.isSubtype(enclClass.type, v.owner.type))
4950 return;
4951
4952 // If the reference isn't from an initializer, then
4953 // the reference is OK.
4954 if (!Resolve.isInitializer(env))
4955 return;
4956
4957 log.error(tree.pos(), Errors.IllegalEnumStaticRef);
4958 }
4959 }
4960
4961 /** Is the given symbol a static, non-constant field of an Enum?
4962 * Note: enum literals should not be regarded as such
4963 */
4964 private boolean isStaticEnumField(VarSymbol v) {
4965 return Flags.isEnum(v.owner) &&
4966 Flags.isStatic(v) &&
4967 !Flags.isConstant(v) &&
4968 v.name != names._class;
4969 }
4970
4971 /**
4972 * Check that method arguments conform to its instantiation.
4973 **/
4974 public Type checkMethod(Type site,
4975 final Symbol sym,
4976 ResultInfo resultInfo,
4977 Env<AttrContext> env,
4978 final List<JCExpression> argtrees,
4979 List<Type> argtypes,
4980 List<Type> typeargtypes) {
4981 // Test (5): if symbol is an instance method of a raw type, issue
4982 // an unchecked warning if its argument types change under erasure.
4983 if ((sym.flags() & STATIC) == 0 &&
4984 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
4985 Type s = types.asOuterSuper(site, sym.owner);
4986 if (s != null && s.isRaw() &&
4987 !types.isSameTypes(sym.type.getParameterTypes(),
4988 sym.erasure(types).getParameterTypes())) {
4989 chk.warnUnchecked(env.tree.pos(), LintWarnings.UncheckedCallMbrOfRawType(sym, s));
4990 }
4991 }
4992
4993 if (env.info.defaultSuperCallSite != null) {
4994 for (Type sup : types.interfaces(env.enclClass.type).prepend(types.supertype((env.enclClass.type)))) {
4995 if (!sup.tsym.isSubClass(sym.enclClass(), types) ||
4996 types.isSameType(sup, env.info.defaultSuperCallSite)) continue;
4997 List<MethodSymbol> icand_sup =
4998 types.interfaceCandidates(sup, (MethodSymbol)sym);
4999 if (icand_sup.nonEmpty() &&
5000 icand_sup.head != sym &&
5001 icand_sup.head.overrides(sym, icand_sup.head.enclClass(), types, true)) {
5002 log.error(env.tree.pos(),
5003 Errors.IllegalDefaultSuperCall(env.info.defaultSuperCallSite, Fragments.OverriddenDefault(sym, sup)));
5004 break;
5005 }
5006 }
5007 env.info.defaultSuperCallSite = null;
5008 }
5009
5010 if (sym.isStatic() && site.isInterface() && env.tree.hasTag(APPLY)) {
5011 JCMethodInvocation app = (JCMethodInvocation)env.tree;
5012 if (app.meth.hasTag(SELECT) &&
5013 !TreeInfo.isStaticSelector(((JCFieldAccess)app.meth).selected, names)) {
5014 log.error(env.tree.pos(), Errors.IllegalStaticIntfMethCall(site));
5015 }
5016 }
5017
5018 // Compute the identifier's instantiated type.
5019 // For methods, we need to compute the instance type by
5020 // Resolve.instantiate from the symbol's type as well as
5021 // any type arguments and value arguments.
5022 Warner noteWarner = new Warner();
5023 try {
5024 Type owntype = rs.checkMethod(
5025 env,
5026 site,
5027 sym,
5028 resultInfo,
5029 argtypes,
5030 typeargtypes,
5031 noteWarner);
5032
5033 DeferredAttr.DeferredTypeMap<Void> checkDeferredMap =
5034 deferredAttr.new DeferredTypeMap<>(DeferredAttr.AttrMode.CHECK, sym, env.info.pendingResolutionPhase);
5035
5036 argtypes = argtypes.map(checkDeferredMap);
5037
5038 if (noteWarner.hasNonSilentLint(LintCategory.UNCHECKED)) {
5039 chk.warnUnchecked(env.tree.pos(), LintWarnings.UncheckedMethInvocationApplied(kindName(sym),
5040 sym.name,
5041 rs.methodArguments(sym.type.getParameterTypes()),
5042 rs.methodArguments(argtypes.map(checkDeferredMap)),
5043 kindName(sym.location()),
5044 sym.location()));
5045 if (resultInfo.pt != Infer.anyPoly ||
5046 !owntype.hasTag(METHOD) ||
5047 !owntype.isPartial()) {
5048 //if this is not a partially inferred method type, erase return type. Otherwise,
5049 //erasure is carried out in PartiallyInferredMethodType.check().
5050 owntype = new MethodType(owntype.getParameterTypes(),
5051 types.erasure(owntype.getReturnType()),
5052 types.erasure(owntype.getThrownTypes()),
5053 syms.methodClass);
5054 }
5055 }
5056
5057 PolyKind pkind = (sym.type.hasTag(FORALL) &&
5058 sym.type.getReturnType().containsAny(((ForAll)sym.type).tvars)) ?
5059 PolyKind.POLY : PolyKind.STANDALONE;
5060 TreeInfo.setPolyKind(env.tree, pkind);
5061
5062 return (resultInfo.pt == Infer.anyPoly) ?
5063 owntype :
5064 chk.checkMethod(owntype, sym, env, argtrees, argtypes, env.info.lastResolveVarargs(),
5065 resultInfo.checkContext.inferenceContext());
5066 } catch (Infer.InferenceException ex) {
5067 //invalid target type - propagate exception outwards or report error
5068 //depending on the current check context
5069 resultInfo.checkContext.report(env.tree.pos(), ex.getDiagnostic());
5070 return types.createErrorType(site);
5071 } catch (Resolve.InapplicableMethodException ex) {
5072 final JCDiagnostic diag = ex.getDiagnostic();
5073 Resolve.InapplicableSymbolError errSym = rs.new InapplicableSymbolError(null) {
5074 @Override
5075 protected Pair<Symbol, JCDiagnostic> errCandidate() {
5076 return new Pair<>(sym, diag);
5077 }
5078 };
5079 List<Type> argtypes2 = argtypes.map(
5080 rs.new ResolveDeferredRecoveryMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase));
5081 JCDiagnostic errDiag = errSym.getDiagnostic(JCDiagnostic.DiagnosticType.ERROR,
5082 env.tree, sym, site, sym.name, argtypes2, typeargtypes);
5083 log.report(errDiag);
5084 return types.createErrorType(site);
5085 }
5086 }
5087
5088 public void visitLiteral(JCLiteral tree) {
5089 result = check(tree, litType(tree.typetag).constType(tree.value),
5090 KindSelector.VAL, resultInfo);
5091 }
5092 //where
5093 /** Return the type of a literal with given type tag.
5094 */
5095 Type litType(TypeTag tag) {
5096 return (tag == CLASS) ? syms.stringType : syms.typeOfTag[tag.ordinal()];
5097 }
5098
5099 public void visitTypeIdent(JCPrimitiveTypeTree tree) {
5100 result = check(tree, syms.typeOfTag[tree.typetag.ordinal()], KindSelector.TYP, resultInfo);
5101 }
5102
5103 public void visitTypeArray(JCArrayTypeTree tree) {
5104 Type etype = attribType(tree.elemtype, env);
5105 Type type = new ArrayType(etype, syms.arrayClass);
5106 result = check(tree, type, KindSelector.TYP, resultInfo);
5107 }
5108
5109 /** Visitor method for parameterized types.
5110 * Bound checking is left until later, since types are attributed
5111 * before supertype structure is completely known
5112 */
5113 public void visitTypeApply(JCTypeApply tree) {
5114 Type owntype = types.createErrorType(tree.type);
5115
5116 // Attribute functor part of application and make sure it's a class.
5117 Type clazztype = chk.checkClassType(tree.clazz.pos(), attribType(tree.clazz, env));
5118
5119 // Attribute type parameters
5120 List<Type> actuals = attribTypes(tree.arguments, env);
5121
5122 if (clazztype.hasTag(CLASS)) {
5123 List<Type> formals = clazztype.tsym.type.getTypeArguments();
5124 if (actuals.isEmpty()) //diamond
5125 actuals = formals;
5126
5127 if (actuals.length() == formals.length()) {
5128 List<Type> a = actuals;
5129 List<Type> f = formals;
5130 while (a.nonEmpty()) {
5131 a.head = a.head.withTypeVar(f.head);
5132 a = a.tail;
5133 f = f.tail;
5134 }
5135 // Compute the proper generic outer
5136 Type clazzOuter = clazztype.getEnclosingType();
5137 if (clazzOuter.hasTag(CLASS)) {
5138 Type site;
5139 JCExpression clazz = TreeInfo.typeIn(tree.clazz);
5140 if (clazz.hasTag(IDENT)) {
5141 site = env.enclClass.sym.type;
5142 } else if (clazz.hasTag(SELECT)) {
5143 site = ((JCFieldAccess) clazz).selected.type;
5144 } else throw new AssertionError(""+tree);
5145 if (clazzOuter.hasTag(CLASS) && site != clazzOuter) {
5146 if (site.hasTag(CLASS) || site.hasTag(TYPEVAR))
5147 site = types.asEnclosingSuper(site, clazzOuter.tsym);
5148 if (site == null)
5149 site = types.erasure(clazzOuter);
5150 clazzOuter = site;
5151 }
5152 }
5153 owntype = new ClassType(clazzOuter, actuals, clazztype.tsym,
5154 clazztype.getMetadata());
5155 } else {
5156 if (formals.length() != 0) {
5157 log.error(tree.pos(),
5158 Errors.WrongNumberTypeArgs(Integer.toString(formals.length())));
5159 } else {
5160 log.error(tree.pos(), Errors.TypeDoesntTakeParams(clazztype.tsym));
5161 }
5162 owntype = types.createErrorType(tree.type);
5163 }
5164 } else if (clazztype.hasTag(ERROR)) {
5165 ErrorType parameterizedErroneous =
5166 new ErrorType(clazztype.getOriginalType(),
5167 clazztype.tsym,
5168 clazztype.getMetadata());
5169
5170 parameterizedErroneous.typarams_field = actuals;
5171 owntype = parameterizedErroneous;
5172 }
5173 result = check(tree, owntype, KindSelector.TYP, resultInfo);
5174 }
5175
5176 public void visitTypeUnion(JCTypeUnion tree) {
5177 ListBuffer<Type> multicatchTypes = new ListBuffer<>();
5178 ListBuffer<Type> all_multicatchTypes = null; // lazy, only if needed
5179 for (JCExpression typeTree : tree.alternatives) {
5180 Type ctype = attribType(typeTree, env);
5181 ctype = chk.checkType(typeTree.pos(),
5182 chk.checkClassType(typeTree.pos(), ctype),
5183 syms.throwableType);
5184 if (!ctype.isErroneous()) {
5185 //check that alternatives of a union type are pairwise
5186 //unrelated w.r.t. subtyping
5187 if (chk.intersects(ctype, multicatchTypes.toList())) {
5188 for (Type t : multicatchTypes) {
5189 boolean sub = types.isSubtype(ctype, t);
5190 boolean sup = types.isSubtype(t, ctype);
5191 if (sub || sup) {
5192 //assume 'a' <: 'b'
5193 Type a = sub ? ctype : t;
5194 Type b = sub ? t : ctype;
5195 log.error(typeTree.pos(), Errors.MulticatchTypesMustBeDisjoint(a, b));
5196 }
5197 }
5198 }
5199 multicatchTypes.append(ctype);
5200 if (all_multicatchTypes != null)
5201 all_multicatchTypes.append(ctype);
5202 } else {
5203 if (all_multicatchTypes == null) {
5204 all_multicatchTypes = new ListBuffer<>();
5205 all_multicatchTypes.appendList(multicatchTypes);
5206 }
5207 all_multicatchTypes.append(ctype);
5208 }
5209 }
5210 Type t = check(tree, types.lub(multicatchTypes.toList()),
5211 KindSelector.TYP, resultInfo.dup(CheckMode.NO_TREE_UPDATE));
5212 if (t.hasTag(CLASS)) {
5213 List<Type> alternatives =
5214 ((all_multicatchTypes == null) ? multicatchTypes : all_multicatchTypes).toList();
5215 t = new UnionClassType((ClassType) t, alternatives);
5216 }
5217 tree.type = result = t;
5218 }
5219
5220 public void visitTypeIntersection(JCTypeIntersection tree) {
5221 attribTypes(tree.bounds, env);
5222 tree.type = result = checkIntersection(tree, tree.bounds);
5223 }
5224
5225 public void visitTypeParameter(JCTypeParameter tree) {
5226 TypeVar typeVar = (TypeVar) tree.type;
5227
5228 if (tree.annotations != null && tree.annotations.nonEmpty()) {
5229 annotate.annotateTypeParameterSecondStage(tree, tree.annotations);
5230 }
5231
5232 if (!typeVar.getUpperBound().isErroneous()) {
5233 //fixup type-parameter bound computed in 'attribTypeVariables'
5234 typeVar.setUpperBound(checkIntersection(tree, tree.bounds));
5235 }
5236 }
5237
5238 Type checkIntersection(JCTree tree, List<JCExpression> bounds) {
5239 Set<Symbol> boundSet = new HashSet<>();
5240 if (bounds.nonEmpty()) {
5241 // accept class or interface or typevar as first bound.
5242 bounds.head.type = checkBase(bounds.head.type, bounds.head, env, false, false, false);
5243 boundSet.add(types.erasure(bounds.head.type).tsym);
5244 if (bounds.head.type.isErroneous()) {
5245 return bounds.head.type;
5246 }
5247 else if (bounds.head.type.hasTag(TYPEVAR)) {
5248 // if first bound was a typevar, do not accept further bounds.
5249 if (bounds.tail.nonEmpty()) {
5250 log.error(bounds.tail.head.pos(),
5251 Errors.TypeVarMayNotBeFollowedByOtherBounds);
5252 return bounds.head.type;
5253 }
5254 } else {
5255 // if first bound was a class or interface, accept only interfaces
5256 // as further bounds.
5257 for (JCExpression bound : bounds.tail) {
5258 bound.type = checkBase(bound.type, bound, env, false, true, false);
5259 if (bound.type.isErroneous()) {
5260 bounds = List.of(bound);
5261 }
5262 else if (bound.type.hasTag(CLASS)) {
5263 chk.checkNotRepeated(bound.pos(), types.erasure(bound.type), boundSet);
5264 }
5265 }
5266 }
5267 }
5268
5269 if (bounds.length() == 0) {
5270 return syms.objectType;
5271 } else if (bounds.length() == 1) {
5272 return bounds.head.type;
5273 } else {
5274 Type owntype = types.makeIntersectionType(TreeInfo.types(bounds));
5275 // ... the variable's bound is a class type flagged COMPOUND
5276 // (see comment for TypeVar.bound).
5277 // In this case, generate a class tree that represents the
5278 // bound class, ...
5279 JCExpression extending;
5280 List<JCExpression> implementing;
5281 if (!bounds.head.type.isInterface()) {
5282 extending = bounds.head;
5283 implementing = bounds.tail;
5284 } else {
5285 extending = null;
5286 implementing = bounds;
5287 }
5288 JCClassDecl cd = make.at(tree).ClassDef(
5289 make.Modifiers(PUBLIC | ABSTRACT),
5290 names.empty, List.nil(),
5291 extending, implementing, List.nil());
5292
5293 ClassSymbol c = (ClassSymbol)owntype.tsym;
5294 Assert.check((c.flags() & COMPOUND) != 0);
5295 cd.sym = c;
5296 c.sourcefile = env.toplevel.sourcefile;
5297
5298 // ... and attribute the bound class
5299 c.flags_field |= UNATTRIBUTED;
5300 Env<AttrContext> cenv = enter.classEnv(cd, env);
5301 typeEnvs.put(c, cenv);
5302 attribClass(c);
5303 return owntype;
5304 }
5305 }
5306
5307 public void visitWildcard(JCWildcard tree) {
5308 //- System.err.println("visitWildcard("+tree+");");//DEBUG
5309 Type type = (tree.kind.kind == BoundKind.UNBOUND)
5310 ? syms.objectType
5311 : attribType(tree.inner, env);
5312 result = check(tree, new WildcardType(chk.checkRefType(tree.pos(), type),
5313 tree.kind.kind,
5314 syms.boundClass),
5315 KindSelector.TYP, resultInfo);
5316 }
5317
5318 public void visitAnnotation(JCAnnotation tree) {
5319 Assert.error("should be handled in annotate");
5320 }
5321
5322 @Override
5323 public void visitModifiers(JCModifiers tree) {
5324 //error recovery only:
5325 Assert.check(resultInfo.pkind == KindSelector.ERR);
5326
5327 attribAnnotationTypes(tree.annotations, env);
5328 }
5329
5330 public void visitAnnotatedType(JCAnnotatedType tree) {
5331 attribAnnotationTypes(tree.annotations, env);
5332 Type underlyingType = attribTree(tree.underlyingType, env, resultInfo);
5333 if (underlyingType.getTag() == PACKAGE || underlyingType.getTag() == VOID) {
5334 result = tree.type = underlyingType;
5335 } else {
5336 Type annotatedType = underlyingType.preannotatedType();
5337
5338 annotate.annotateTypeSecondStage(tree, tree.annotations, annotatedType);
5339 result = tree.type = annotatedType;
5340 }
5341 }
5342
5343 public void visitErroneous(JCErroneous tree) {
5344 if (tree.errs != null) {
5345 WriteableScope newScope = env.info.scope;
5346
5347 if (env.tree instanceof JCClassDecl) {
5348 Symbol fakeOwner =
5349 new MethodSymbol(BLOCK, names.empty, null,
5350 env.info.scope.owner);
5351 newScope = newScope.dupUnshared(fakeOwner);
5352 }
5353
5354 Env<AttrContext> errEnv =
5355 env.dup(env.tree,
5356 env.info.dup(newScope));
5357 errEnv.info.returnResult = unknownExprInfo;
5358 for (JCTree err : tree.errs)
5359 attribTree(err, errEnv, new ResultInfo(KindSelector.ERR, pt()));
5360 }
5361 result = tree.type = syms.errType;
5362 }
5363
5364 /** Default visitor method for all other trees.
5365 */
5366 public void visitTree(JCTree tree) {
5367 throw new AssertionError();
5368 }
5369
5370 /**
5371 * Attribute an env for either a top level tree or class or module declaration.
5372 */
5373 public void attrib(Env<AttrContext> env) {
5374 switch (env.tree.getTag()) {
5375 case MODULEDEF:
5376 attribModule(env.tree.pos(), ((JCModuleDecl)env.tree).sym);
5377 break;
5378 case PACKAGEDEF:
5379 attribPackage(env.tree.pos(), ((JCPackageDecl) env.tree).packge);
5380 break;
5381 default:
5382 attribClass(env.tree.pos(), env.enclClass.sym);
5383 }
5384
5385 annotate.flush();
5386
5387 // Now that this tree is attributed, we can calculate the Lint configuration everywhere within it
5388 lintMapper.calculateLints(env.toplevel.sourcefile, env.tree);
5389 }
5390
5391 public void attribPackage(DiagnosticPosition pos, PackageSymbol p) {
5392 try {
5393 annotate.flush();
5394 attribPackage(p);
5395 } catch (CompletionFailure ex) {
5396 chk.completionError(pos, ex);
5397 }
5398 }
5399
5400 void attribPackage(PackageSymbol p) {
5401 attribWithLint(p,
5402 env -> chk.checkDeprecatedAnnotation(((JCPackageDecl) env.tree).pid.pos(), p));
5403 }
5404
5405 public void attribModule(DiagnosticPosition pos, ModuleSymbol m) {
5406 try {
5407 annotate.flush();
5408 attribModule(m);
5409 } catch (CompletionFailure ex) {
5410 chk.completionError(pos, ex);
5411 }
5412 }
5413
5414 void attribModule(ModuleSymbol m) {
5415 attribWithLint(m, env -> attribStat(env.tree, env));
5416 }
5417
5418 private void attribWithLint(TypeSymbol sym, Consumer<Env<AttrContext>> attrib) {
5419 Env<AttrContext> env = typeEnvs.get(sym);
5420
5421 Env<AttrContext> lintEnv = env;
5422 while (lintEnv.info.lint == null)
5423 lintEnv = lintEnv.next;
5424
5425 Lint lint = lintEnv.info.lint.augment(sym);
5426
5427 Lint prevLint = chk.setLint(lint);
5428 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
5429
5430 try {
5431 attrib.accept(env);
5432 } finally {
5433 log.useSource(prev);
5434 chk.setLint(prevLint);
5435 }
5436 }
5437
5438 /** Main method: attribute class definition associated with given class symbol.
5439 * reporting completion failures at the given position.
5440 * @param pos The source position at which completion errors are to be
5441 * reported.
5442 * @param c The class symbol whose definition will be attributed.
5443 */
5444 public void attribClass(DiagnosticPosition pos, ClassSymbol c) {
5445 try {
5446 annotate.flush();
5447 attribClass(c);
5448 } catch (CompletionFailure ex) {
5449 chk.completionError(pos, ex);
5450 }
5451 }
5452
5453 /** Attribute class definition associated with given class symbol.
5454 * @param c The class symbol whose definition will be attributed.
5455 */
5456 void attribClass(ClassSymbol c) throws CompletionFailure {
5457 if (c.type.hasTag(ERROR)) return;
5458
5459 // Check for cycles in the inheritance graph, which can arise from
5460 // ill-formed class files.
5461 chk.checkNonCyclic(null, c.type);
5462
5463 Type st = types.supertype(c.type);
5464 if ((c.flags_field & Flags.COMPOUND) == 0 &&
5465 (c.flags_field & Flags.SUPER_OWNER_ATTRIBUTED) == 0 &&
5466 breakTree == null) {
5467 // First, attribute superclass.
5468 if (st.hasTag(CLASS))
5469 attribClass((ClassSymbol)st.tsym);
5470
5471 // Next attribute owner, if it is a class.
5472 if (c.owner.kind == TYP && c.owner.type.hasTag(CLASS))
5473 attribClass((ClassSymbol)c.owner);
5474
5475 c.flags_field |= Flags.SUPER_OWNER_ATTRIBUTED;
5476 }
5477
5478 // The previous operations might have attributed the current class
5479 // if there was a cycle. So we test first whether the class is still
5480 // UNATTRIBUTED.
5481 if ((c.flags_field & UNATTRIBUTED) != 0) {
5482 c.flags_field &= ~UNATTRIBUTED;
5483
5484 // Get environment current at the point of class definition.
5485 Env<AttrContext> env = typeEnvs.get(c);
5486
5487 // The info.lint field in the envs stored in typeEnvs is deliberately uninitialized,
5488 // because the annotations were not available at the time the env was created. Therefore,
5489 // we look up the environment chain for the first enclosing environment for which the
5490 // lint value is set. Typically, this is the parent env, but might be further if there
5491 // are any envs created as a result of TypeParameter nodes.
5492 Env<AttrContext> lintEnv = env;
5493 while (lintEnv.info.lint == null)
5494 lintEnv = lintEnv.next;
5495
5496 // Having found the enclosing lint value, we can initialize the lint value for this class
5497 env.info.lint = lintEnv.info.lint.augment(c);
5498
5499 Lint prevLint = chk.setLint(env.info.lint);
5500 JavaFileObject prev = log.useSource(c.sourcefile);
5501 ResultInfo prevReturnRes = env.info.returnResult;
5502
5503 try {
5504 if (c.isSealed() &&
5505 !c.isEnum() &&
5506 !c.isPermittedExplicit &&
5507 c.getPermittedSubclasses().isEmpty()) {
5508 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.SealedClassMustHaveSubclasses);
5509 }
5510
5511 if (c.isSealed()) {
5512 Set<Symbol> permittedTypes = new HashSet<>();
5513 boolean sealedInUnnamed = c.packge().modle == syms.unnamedModule || c.packge().modle == syms.noModule;
5514 for (Type subType : c.getPermittedSubclasses()) {
5515 if (subType.isErroneous()) {
5516 // the type already caused errors, don't produce more potentially misleading errors
5517 continue;
5518 }
5519 boolean isTypeVar = false;
5520 if (subType.getTag() == TYPEVAR) {
5521 isTypeVar = true; //error recovery
5522 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5523 Errors.InvalidPermitsClause(Fragments.IsATypeVariable(subType)));
5524 }
5525 if (subType.tsym.isAnonymous() && !c.isEnum()) {
5526 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree), Errors.LocalClassesCantExtendSealed(Fragments.Anonymous));
5527 }
5528 if (permittedTypes.contains(subType.tsym)) {
5529 DiagnosticPosition pos =
5530 env.enclClass.permitting.stream()
5531 .filter(permittedExpr -> TreeInfo.diagnosticPositionFor(subType.tsym, permittedExpr, true) != null)
5532 .limit(2).collect(List.collector()).get(1);
5533 log.error(pos, Errors.InvalidPermitsClause(Fragments.IsDuplicated(subType)));
5534 } else {
5535 permittedTypes.add(subType.tsym);
5536 }
5537 if (sealedInUnnamed) {
5538 if (subType.tsym.packge() != c.packge()) {
5539 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5540 Errors.ClassInUnnamedModuleCantExtendSealedInDiffPackage(c)
5541 );
5542 }
5543 } else if (subType.tsym.packge().modle != c.packge().modle) {
5544 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5545 Errors.ClassInModuleCantExtendSealedInDiffModule(c, c.packge().modle)
5546 );
5547 }
5548 if (subType.tsym == c.type.tsym || types.isSuperType(subType, c.type)) {
5549 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, ((JCClassDecl)env.tree).permitting),
5550 Errors.InvalidPermitsClause(
5551 subType.tsym == c.type.tsym ?
5552 Fragments.MustNotBeSameClass :
5553 Fragments.MustNotBeSupertype(subType)
5554 )
5555 );
5556 } else if (!isTypeVar) {
5557 boolean thisIsASuper = types.directSupertypes(subType)
5558 .stream()
5559 .anyMatch(d -> d.tsym == c);
5560 if (!thisIsASuper) {
5561 if(c.isInterface()) {
5562 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5563 Errors.InvalidPermitsClause(Fragments.DoesntImplementSealed(kindName(subType.tsym), subType)));
5564 } else {
5565 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5566 Errors.InvalidPermitsClause(Fragments.DoesntExtendSealed(subType)));
5567 }
5568 }
5569 }
5570 }
5571 }
5572
5573 List<ClassSymbol> sealedSupers = types.directSupertypes(c.type)
5574 .stream()
5575 .filter(s -> s.tsym.isSealed())
5576 .map(s -> (ClassSymbol) s.tsym)
5577 .collect(List.collector());
5578
5579 if (sealedSupers.isEmpty()) {
5580 if ((c.flags_field & Flags.NON_SEALED) != 0) {
5581 boolean hasErrorSuper = false;
5582
5583 hasErrorSuper |= types.directSupertypes(c.type)
5584 .stream()
5585 .anyMatch(s -> s.tsym.kind == Kind.ERR);
5586
5587 ClassType ct = (ClassType) c.type;
5588
5589 hasErrorSuper |= !ct.isCompound() && ct.interfaces_field != ct.all_interfaces_field;
5590
5591 if (!hasErrorSuper) {
5592 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.NonSealedWithNoSealedSupertype(c));
5593 }
5594 }
5595 } else {
5596 if (c.isDirectlyOrIndirectlyLocal() && !c.isEnum()) {
5597 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.LocalClassesCantExtendSealed(c.isAnonymous() ? Fragments.Anonymous : Fragments.Local));
5598 }
5599
5600 if (!c.type.isCompound()) {
5601 for (ClassSymbol supertypeSym : sealedSupers) {
5602 if (!supertypeSym.isPermittedSubclass(c.type.tsym)) {
5603 log.error(TreeInfo.diagnosticPositionFor(c.type.tsym, env.tree), Errors.CantInheritFromSealed(supertypeSym));
5604 }
5605 }
5606 if (!c.isNonSealed() && !c.isFinal() && !c.isSealed()) {
5607 log.error(TreeInfo.diagnosticPositionFor(c, env.tree),
5608 c.isInterface() ?
5609 Errors.NonSealedOrSealedExpected :
5610 Errors.NonSealedSealedOrFinalExpected);
5611 }
5612 }
5613 }
5614
5615 env.info.returnResult = null;
5616 // java.lang.Enum may not be subclassed by a non-enum
5617 if (st.tsym == syms.enumSym &&
5618 ((c.flags_field & (Flags.ENUM|Flags.COMPOUND)) == 0))
5619 log.error(env.tree.pos(), Errors.EnumNoSubclassing);
5620
5621 // Enums may not be extended by source-level classes
5622 if (st.tsym != null &&
5623 ((st.tsym.flags_field & Flags.ENUM) != 0) &&
5624 ((c.flags_field & (Flags.ENUM | Flags.COMPOUND)) == 0)) {
5625 log.error(env.tree.pos(), Errors.EnumTypesNotExtensible);
5626 }
5627
5628 if (rs.isSerializable(c.type)) {
5629 env.info.isSerializable = true;
5630 }
5631
5632 attribClassBody(env, c);
5633
5634 chk.checkDeprecatedAnnotation(env.tree.pos(), c);
5635 chk.checkClassOverrideEqualsAndHashIfNeeded(env.tree.pos(), c);
5636 chk.checkFunctionalInterface((JCClassDecl) env.tree, c);
5637 chk.checkLeaksNotAccessible(env, (JCClassDecl) env.tree);
5638
5639 if (c.isImplicit()) {
5640 chk.checkHasMain(env.tree.pos(), c);
5641 }
5642 } finally {
5643 env.info.returnResult = prevReturnRes;
5644 log.useSource(prev);
5645 chk.setLint(prevLint);
5646 }
5647
5648 }
5649 }
5650
5651 public void visitImport(JCImport tree) {
5652 // nothing to do
5653 }
5654
5655 public void visitModuleDef(JCModuleDecl tree) {
5656 tree.sym.completeUsesProvides();
5657 ModuleSymbol msym = tree.sym;
5658 Lint lint = env.outer.info.lint = env.outer.info.lint.augment(msym);
5659 Lint prevLint = chk.setLint(lint);
5660 try {
5661 chk.checkModuleName(tree);
5662 chk.checkDeprecatedAnnotation(tree, msym);
5663 } finally {
5664 chk.setLint(prevLint);
5665 }
5666 }
5667
5668 /** Finish the attribution of a class. */
5669 private void attribClassBody(Env<AttrContext> env, ClassSymbol c) {
5670 JCClassDecl tree = (JCClassDecl)env.tree;
5671 Assert.check(c == tree.sym);
5672
5673 // Validate type parameters, supertype and interfaces.
5674 attribStats(tree.typarams, env);
5675 if (!c.isAnonymous()) {
5676 //already checked if anonymous
5677 chk.validate(tree.typarams, env);
5678 chk.validate(tree.extending, env);
5679 chk.validate(tree.implementing, env);
5680 }
5681
5682 chk.checkRequiresIdentity(tree, env.info.lint);
5683
5684 c.markAbstractIfNeeded(types);
5685
5686 // If this is a non-abstract class, check that it has no abstract
5687 // methods or unimplemented methods of an implemented interface.
5688 if ((c.flags() & (ABSTRACT | INTERFACE)) == 0) {
5689 chk.checkAllDefined(tree.pos(), c);
5690 }
5691
5692 if ((c.flags() & ANNOTATION) != 0) {
5693 if (tree.implementing.nonEmpty())
5694 log.error(tree.implementing.head.pos(),
5695 Errors.CantExtendIntfAnnotation);
5696 if (tree.typarams.nonEmpty()) {
5697 log.error(tree.typarams.head.pos(),
5698 Errors.IntfAnnotationCantHaveTypeParams(c));
5699 }
5700
5701 // If this annotation type has a @Repeatable, validate
5702 Attribute.Compound repeatable = c.getAnnotationTypeMetadata().getRepeatable();
5703 // If this annotation type has a @Repeatable, validate
5704 if (repeatable != null) {
5705 // get diagnostic position for error reporting
5706 DiagnosticPosition cbPos = getDiagnosticPosition(tree, repeatable.type);
5707 Assert.checkNonNull(cbPos);
5708
5709 chk.validateRepeatable(c, repeatable, cbPos);
5710 }
5711 } else {
5712 try {
5713 // Check that all extended classes and interfaces
5714 // are compatible (i.e. no two define methods with same arguments
5715 // yet different return types). (JLS 8.4.8.3)
5716 chk.checkCompatibleSupertypes(tree.pos(), c.type);
5717 chk.checkDefaultMethodClashes(tree.pos(), c.type);
5718 chk.checkPotentiallyAmbiguousOverloads(tree, c.type);
5719 } catch (CompletionFailure cf) {
5720 chk.completionError(tree.pos(), cf);
5721 }
5722 }
5723
5724 // Check that class does not import the same parameterized interface
5725 // with two different argument lists.
5726 chk.checkClassBounds(tree.pos(), c.type);
5727
5728 tree.type = c.type;
5729
5730 for (List<JCTypeParameter> l = tree.typarams;
5731 l.nonEmpty(); l = l.tail) {
5732 Assert.checkNonNull(env.info.scope.findFirst(l.head.name));
5733 }
5734
5735 // Check that a generic class doesn't extend Throwable
5736 if (!c.type.allparams().isEmpty() && types.isSubtype(c.type, syms.throwableType))
5737 log.error(tree.extending.pos(), Errors.GenericThrowable);
5738
5739 // Check that all methods which implement some
5740 // method conform to the method they implement.
5741 chk.checkImplementations(tree);
5742
5743 //check that a resource implementing AutoCloseable cannot throw InterruptedException
5744 checkAutoCloseable(env, tree, false);
5745
5746 for (List<JCTree> l = tree.defs; l.nonEmpty(); l = l.tail) {
5747 // Attribute declaration
5748 attribStat(l.head, env);
5749 // Check that declarations in inner classes are not static (JLS 8.1.2)
5750 // Make an exception for static constants.
5751 if (!allowRecords &&
5752 c.owner.kind != PCK &&
5753 ((c.flags() & STATIC) == 0 || c.name == names.empty) &&
5754 (TreeInfo.flags(l.head) & (STATIC | INTERFACE)) != 0) {
5755 VarSymbol sym = null;
5756 if (l.head.hasTag(VARDEF)) sym = ((JCVariableDecl) l.head).sym;
5757 if (sym == null ||
5758 sym.kind != VAR ||
5759 sym.getConstValue() == null)
5760 log.error(l.head.pos(), Errors.IclsCantHaveStaticDecl(c));
5761 }
5762 }
5763
5764 // Check for proper placement of super()/this() calls.
5765 chk.checkSuperInitCalls(tree);
5766
5767 // Check for cycles among non-initial constructors.
5768 chk.checkCyclicConstructors(tree);
5769
5770 // Check for cycles among annotation elements.
5771 chk.checkNonCyclicElements(tree);
5772
5773 // Check for proper use of serialVersionUID and other
5774 // serialization-related fields and methods
5775 if (env.info.lint.isEnabled(LintCategory.SERIAL)
5776 && rs.isSerializable(c.type)
5777 && !c.isAnonymous()) {
5778 chk.checkSerialStructure(env, tree, c);
5779 }
5780 // Correctly organize the positions of the type annotations
5781 typeAnnotations.organizeTypeAnnotationsBodies(tree);
5782
5783 // Check type annotations applicability rules
5784 validateTypeAnnotations(tree, false);
5785 }
5786 // where
5787 /** get a diagnostic position for an attribute of Type t, or null if attribute missing */
5788 private DiagnosticPosition getDiagnosticPosition(JCClassDecl tree, Type t) {
5789 for(List<JCAnnotation> al = tree.mods.annotations; !al.isEmpty(); al = al.tail) {
5790 if (types.isSameType(al.head.annotationType.type, t))
5791 return al.head.pos();
5792 }
5793
5794 return null;
5795 }
5796
5797 private Type capture(Type type) {
5798 return types.capture(type);
5799 }
5800
5801 private void setupImplicitlyTypedVariable(JCVariableDecl tree, Type type) {
5802 Assert.check(tree.isImplicitlyTyped());
5803
5804 type.complete();
5805
5806 if (tree.vartype == null) {
5807 return ;
5808 }
5809
5810 Assert.check(tree.vartype.hasTag(VARTYPE));
5811
5812 JCVarType vartype = (JCVarType) tree.vartype;
5813
5814 vartype.type = type;
5815 }
5816
5817 public void validateTypeAnnotations(JCTree tree, boolean sigOnly) {
5818 tree.accept(new TypeAnnotationsValidator(sigOnly));
5819 }
5820 //where
5821 private final class TypeAnnotationsValidator extends TreeScanner {
5822
5823 private final boolean sigOnly;
5824 public TypeAnnotationsValidator(boolean sigOnly) {
5825 this.sigOnly = sigOnly;
5826 }
5827
5828 public void visitAnnotation(JCAnnotation tree) {
5829 chk.validateTypeAnnotation(tree, null, false);
5830 super.visitAnnotation(tree);
5831 }
5832 public void visitAnnotatedType(JCAnnotatedType tree) {
5833 if (!tree.underlyingType.type.isErroneous()) {
5834 super.visitAnnotatedType(tree);
5835 }
5836 }
5837 public void visitTypeParameter(JCTypeParameter tree) {
5838 chk.validateTypeAnnotations(tree.annotations, tree.type.tsym, true);
5839 scan(tree.bounds);
5840 // Don't call super.
5841 // This is needed because above we call validateTypeAnnotation with
5842 // false, which would forbid annotations on type parameters.
5843 // super.visitTypeParameter(tree);
5844 }
5845 public void visitMethodDef(JCMethodDecl tree) {
5846 if (tree.recvparam != null &&
5847 !tree.recvparam.vartype.type.isErroneous()) {
5848 checkForDeclarationAnnotations(tree.recvparam.mods.annotations, tree.recvparam.sym);
5849 }
5850 if (tree.restype != null && tree.restype.type != null) {
5851 validateAnnotatedType(tree.restype, tree.restype.type);
5852 }
5853 if (sigOnly) {
5854 scan(tree.mods);
5855 scan(tree.restype);
5856 scan(tree.typarams);
5857 scan(tree.recvparam);
5858 scan(tree.params);
5859 scan(tree.thrown);
5860 } else {
5861 scan(tree.defaultValue);
5862 scan(tree.body);
5863 }
5864 }
5865 public void visitVarDef(final JCVariableDecl tree) {
5866 //System.err.println("validateTypeAnnotations.visitVarDef " + tree);
5867 if (tree.sym != null && tree.sym.type != null && !tree.isImplicitlyTyped())
5868 validateAnnotatedType(tree.vartype, tree.sym.type);
5869 scan(tree.mods);
5870 scan(tree.vartype);
5871 if (!sigOnly) {
5872 scan(tree.init);
5873 }
5874 }
5875 public void visitTypeCast(JCTypeCast tree) {
5876 if (tree.clazz != null && tree.clazz.type != null)
5877 validateAnnotatedType(tree.clazz, tree.clazz.type);
5878 super.visitTypeCast(tree);
5879 }
5880 public void visitTypeTest(JCInstanceOf tree) {
5881 if (tree.pattern != null && !(tree.pattern instanceof JCPattern) && tree.pattern.type != null)
5882 validateAnnotatedType(tree.pattern, tree.pattern.type);
5883 super.visitTypeTest(tree);
5884 }
5885 public void visitNewClass(JCNewClass tree) {
5886 if (tree.clazz != null && tree.clazz.type != null) {
5887 if (tree.clazz.hasTag(ANNOTATED_TYPE)) {
5888 checkForDeclarationAnnotations(((JCAnnotatedType) tree.clazz).annotations,
5889 tree.clazz.type.tsym);
5890 }
5891 if (tree.def != null) {
5892 checkForDeclarationAnnotations(tree.def.mods.annotations, tree.clazz.type.tsym);
5893 }
5894
5895 validateAnnotatedType(tree.clazz, tree.clazz.type);
5896 }
5897 super.visitNewClass(tree);
5898 }
5899 public void visitNewArray(JCNewArray tree) {
5900 if (tree.elemtype != null && tree.elemtype.type != null) {
5901 if (tree.elemtype.hasTag(ANNOTATED_TYPE)) {
5902 checkForDeclarationAnnotations(((JCAnnotatedType) tree.elemtype).annotations,
5903 tree.elemtype.type.tsym);
5904 }
5905 validateAnnotatedType(tree.elemtype, tree.elemtype.type);
5906 }
5907 super.visitNewArray(tree);
5908 }
5909 public void visitClassDef(JCClassDecl tree) {
5910 //System.err.println("validateTypeAnnotations.visitClassDef " + tree);
5911 if (sigOnly) {
5912 scan(tree.mods);
5913 scan(tree.typarams);
5914 scan(tree.extending);
5915 scan(tree.implementing);
5916 }
5917 for (JCTree member : tree.defs) {
5918 if (member.hasTag(Tag.CLASSDEF)) {
5919 continue;
5920 }
5921 scan(member);
5922 }
5923 }
5924 public void visitBlock(JCBlock tree) {
5925 if (!sigOnly) {
5926 scan(tree.stats);
5927 }
5928 }
5929
5930 /* I would want to model this after
5931 * com.sun.tools.javac.comp.Check.Validator.visitSelectInternal(JCFieldAccess)
5932 * and override visitSelect and visitTypeApply.
5933 * However, we only set the annotated type in the top-level type
5934 * of the symbol.
5935 * Therefore, we need to override each individual location where a type
5936 * can occur.
5937 */
5938 private void validateAnnotatedType(final JCTree errtree, final Type type) {
5939 //System.err.println("Attr.validateAnnotatedType: " + errtree + " type: " + type);
5940
5941 if (type.isPrimitiveOrVoid()) {
5942 return;
5943 }
5944
5945 JCTree enclTr = errtree;
5946 Type enclTy = type;
5947
5948 boolean repeat = true;
5949 while (repeat) {
5950 if (enclTr.hasTag(TYPEAPPLY)) {
5951 List<Type> tyargs = enclTy.getTypeArguments();
5952 List<JCExpression> trargs = ((JCTypeApply)enclTr).getTypeArguments();
5953 if (trargs.length() > 0) {
5954 // Nothing to do for diamonds
5955 if (tyargs.length() == trargs.length()) {
5956 for (int i = 0; i < tyargs.length(); ++i) {
5957 validateAnnotatedType(trargs.get(i), tyargs.get(i));
5958 }
5959 }
5960 // If the lengths don't match, it's either a diamond
5961 // or some nested type that redundantly provides
5962 // type arguments in the tree.
5963 }
5964
5965 // Look at the clazz part of a generic type
5966 enclTr = ((JCTree.JCTypeApply)enclTr).clazz;
5967 }
5968
5969 if (enclTr.hasTag(SELECT)) {
5970 enclTr = ((JCTree.JCFieldAccess)enclTr).getExpression();
5971 if (enclTy != null &&
5972 !enclTy.hasTag(NONE)) {
5973 enclTy = enclTy.getEnclosingType();
5974 }
5975 } else if (enclTr.hasTag(ANNOTATED_TYPE)) {
5976 JCAnnotatedType at = (JCTree.JCAnnotatedType) enclTr;
5977 if (enclTy == null || enclTy.hasTag(NONE)) {
5978 ListBuffer<Attribute.TypeCompound> onlyTypeAnnotationsBuf = new ListBuffer<>();
5979 for (JCAnnotation an : at.getAnnotations()) {
5980 if (chk.isTypeAnnotation(an, false)) {
5981 onlyTypeAnnotationsBuf.add((Attribute.TypeCompound) an.attribute);
5982 }
5983 }
5984 List<Attribute.TypeCompound> onlyTypeAnnotations = onlyTypeAnnotationsBuf.toList();
5985 if (!onlyTypeAnnotations.isEmpty()) {
5986 Fragment annotationFragment = onlyTypeAnnotations.size() == 1 ?
5987 Fragments.TypeAnnotation1(onlyTypeAnnotations.head) :
5988 Fragments.TypeAnnotation(onlyTypeAnnotations);
5989 JCDiagnostic.AnnotatedType annotatedType = new JCDiagnostic.AnnotatedType(
5990 type.stripMetadata().annotatedType(onlyTypeAnnotations));
5991 log.error(at.underlyingType.pos(), Errors.TypeAnnotationInadmissible(annotationFragment,
5992 type.tsym.owner, annotatedType));
5993 }
5994 repeat = false;
5995 }
5996 enclTr = at.underlyingType;
5997 // enclTy doesn't need to be changed
5998 } else if (enclTr.hasTag(IDENT)) {
5999 repeat = false;
6000 } else if (enclTr.hasTag(JCTree.Tag.WILDCARD)) {
6001 JCWildcard wc = (JCWildcard) enclTr;
6002 if (wc.getKind() == JCTree.Kind.EXTENDS_WILDCARD ||
6003 wc.getKind() == JCTree.Kind.SUPER_WILDCARD) {
6004 validateAnnotatedType(wc.getBound(), wc.getBound().type);
6005 } else {
6006 // Nothing to do for UNBOUND
6007 }
6008 repeat = false;
6009 } else if (enclTr.hasTag(TYPEARRAY)) {
6010 JCArrayTypeTree art = (JCArrayTypeTree) enclTr;
6011 validateAnnotatedType(art.getType(), art.elemtype.type);
6012 repeat = false;
6013 } else if (enclTr.hasTag(TYPEUNION)) {
6014 JCTypeUnion ut = (JCTypeUnion) enclTr;
6015 for (JCTree t : ut.getTypeAlternatives()) {
6016 validateAnnotatedType(t, t.type);
6017 }
6018 repeat = false;
6019 } else if (enclTr.hasTag(TYPEINTERSECTION)) {
6020 JCTypeIntersection it = (JCTypeIntersection) enclTr;
6021 for (JCTree t : it.getBounds()) {
6022 validateAnnotatedType(t, t.type);
6023 }
6024 repeat = false;
6025 } else if (enclTr.getKind() == JCTree.Kind.PRIMITIVE_TYPE ||
6026 enclTr.getKind() == JCTree.Kind.ERRONEOUS) {
6027 repeat = false;
6028 } else {
6029 Assert.error("Unexpected tree: " + enclTr + " with kind: " + enclTr.getKind() +
6030 " within: "+ errtree + " with kind: " + errtree.getKind());
6031 }
6032 }
6033 }
6034
6035 private void checkForDeclarationAnnotations(List<? extends JCAnnotation> annotations,
6036 Symbol sym) {
6037 // Ensure that no declaration annotations are present.
6038 // Note that a tree type might be an AnnotatedType with
6039 // empty annotations, if only declaration annotations were given.
6040 // This method will raise an error for such a type.
6041 for (JCAnnotation ai : annotations) {
6042 if (!ai.type.isErroneous() &&
6043 typeAnnotations.annotationTargetType(ai, ai.attribute, sym) == TypeAnnotations.AnnotationType.DECLARATION) {
6044 log.error(ai.pos(), Errors.AnnotationTypeNotApplicableToType(ai.type));
6045 }
6046 }
6047 }
6048 }
6049
6050 // <editor-fold desc="post-attribution visitor">
6051
6052 /**
6053 * Handle missing types/symbols in an AST. This routine is useful when
6054 * the compiler has encountered some errors (which might have ended up
6055 * terminating attribution abruptly); if the compiler is used in fail-over
6056 * mode (e.g. by an IDE) and the AST contains semantic errors, this routine
6057 * prevents NPE to be propagated during subsequent compilation steps.
6058 */
6059 public void postAttr(JCTree tree) {
6060 new PostAttrAnalyzer().scan(tree);
6061 }
6062
6063 class PostAttrAnalyzer extends TreeScanner {
6064
6065 private void initTypeIfNeeded(JCTree that) {
6066 if (that.type == null) {
6067 if (that.hasTag(METHODDEF)) {
6068 that.type = dummyMethodType((JCMethodDecl)that);
6069 } else {
6070 that.type = syms.unknownType;
6071 }
6072 }
6073 }
6074
6075 /* Construct a dummy method type. If we have a method declaration,
6076 * and the declared return type is void, then use that return type
6077 * instead of UNKNOWN to avoid spurious error messages in lambda
6078 * bodies (see:JDK-8041704).
6079 */
6080 private Type dummyMethodType(JCMethodDecl md) {
6081 Type restype = syms.unknownType;
6082 if (md != null && md.restype != null && md.restype.hasTag(TYPEIDENT)) {
6083 JCPrimitiveTypeTree prim = (JCPrimitiveTypeTree)md.restype;
6084 if (prim.typetag == VOID)
6085 restype = syms.voidType;
6086 }
6087 return new MethodType(List.nil(), restype,
6088 List.nil(), syms.methodClass);
6089 }
6090 private Type dummyMethodType() {
6091 return dummyMethodType(null);
6092 }
6093
6094 @Override
6095 public void scan(JCTree tree) {
6096 if (tree == null) return;
6097 if (tree instanceof JCExpression) {
6098 initTypeIfNeeded(tree);
6099 }
6100 super.scan(tree);
6101 }
6102
6103 @Override
6104 public void visitIdent(JCIdent that) {
6105 if (that.sym == null) {
6106 that.sym = syms.unknownSymbol;
6107 }
6108 }
6109
6110 @Override
6111 public void visitSelect(JCFieldAccess that) {
6112 if (that.sym == null) {
6113 that.sym = syms.unknownSymbol;
6114 }
6115 super.visitSelect(that);
6116 }
6117
6118 @Override
6119 public void visitClassDef(JCClassDecl that) {
6120 initTypeIfNeeded(that);
6121 if (that.sym == null) {
6122 that.sym = new ClassSymbol(0, that.name, that.type, syms.noSymbol);
6123 }
6124 super.visitClassDef(that);
6125 }
6126
6127 @Override
6128 public void visitMethodDef(JCMethodDecl that) {
6129 initTypeIfNeeded(that);
6130 if (that.sym == null) {
6131 that.sym = new MethodSymbol(0, that.name, that.type, syms.noSymbol);
6132 }
6133 super.visitMethodDef(that);
6134 }
6135
6136 @Override
6137 public void visitVarDef(JCVariableDecl that) {
6138 initTypeIfNeeded(that);
6139 if (that.sym == null) {
6140 that.sym = new VarSymbol(0, that.name, that.type, syms.noSymbol);
6141 that.sym.adr = 0;
6142 }
6143 super.visitVarDef(that);
6144 }
6145
6146 @Override
6147 public void visitBindingPattern(JCBindingPattern that) {
6148 initTypeIfNeeded(that);
6149 initTypeIfNeeded(that.var);
6150 if (that.var.sym == null) {
6151 that.var.sym = new BindingSymbol(0, that.var.name, that.var.type, syms.noSymbol);
6152 that.var.sym.adr = 0;
6153 }
6154 super.visitBindingPattern(that);
6155 }
6156
6157 @Override
6158 public void visitRecordPattern(JCRecordPattern that) {
6159 initTypeIfNeeded(that);
6160 if (that.record == null) {
6161 that.record = new ClassSymbol(0, TreeInfo.name(that.deconstructor),
6162 that.type, syms.noSymbol);
6163 }
6164 if (that.fullComponentTypes == null) {
6165 that.fullComponentTypes = List.nil();
6166 }
6167 super.visitRecordPattern(that);
6168 }
6169
6170 @Override
6171 public void visitNewClass(JCNewClass that) {
6172 if (that.constructor == null) {
6173 that.constructor = new MethodSymbol(0, names.init,
6174 dummyMethodType(), syms.noSymbol);
6175 }
6176 if (that.constructorType == null) {
6177 that.constructorType = syms.unknownType;
6178 }
6179 super.visitNewClass(that);
6180 }
6181
6182 @Override
6183 public void visitAssignop(JCAssignOp that) {
6184 if (that.operator == null) {
6185 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6186 -1, syms.noSymbol);
6187 }
6188 super.visitAssignop(that);
6189 }
6190
6191 @Override
6192 public void visitBinary(JCBinary that) {
6193 if (that.operator == null) {
6194 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6195 -1, syms.noSymbol);
6196 }
6197 super.visitBinary(that);
6198 }
6199
6200 @Override
6201 public void visitUnary(JCUnary that) {
6202 if (that.operator == null) {
6203 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6204 -1, syms.noSymbol);
6205 }
6206 super.visitUnary(that);
6207 }
6208
6209 @Override
6210 public void visitReference(JCMemberReference that) {
6211 super.visitReference(that);
6212 if (that.sym == null) {
6213 that.sym = new MethodSymbol(0, names.empty, dummyMethodType(),
6214 syms.noSymbol);
6215 }
6216 }
6217
6218 @Override
6219 public void visitVarType(JCVarType that) {
6220 initTypeIfNeeded(that);
6221 }
6222 }
6223 // </editor-fold>
6224
6225 public void setPackageSymbols(JCExpression pid, Symbol pkg) {
6226 new TreeScanner() {
6227 Symbol packge = pkg;
6228 @Override
6229 public void visitIdent(JCIdent that) {
6230 that.sym = packge;
6231 }
6232
6233 @Override
6234 public void visitSelect(JCFieldAccess that) {
6235 that.sym = packge;
6236 packge = packge.owner;
6237 super.visitSelect(that);
6238 }
6239 }.scan(pid);
6240 }
6241
6242 }