1 /*
2 * Copyright (c) 1999, 2024, 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.LambdaExpressionTree.BodyKind;
40 import com.sun.source.tree.MemberReferenceTree.ReferenceMode;
41 import com.sun.source.tree.MemberSelectTree;
42 import com.sun.source.tree.TreeVisitor;
43 import com.sun.source.util.SimpleTreeVisitor;
44 import com.sun.tools.javac.code.*;
45 import com.sun.tools.javac.code.Lint.LintCategory;
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.Attr.ResultInfo;
53 import com.sun.tools.javac.comp.Check.CheckContext;
54 import com.sun.tools.javac.comp.Check.NestedCheckContext;
55 import com.sun.tools.javac.comp.DeferredAttr.AttrMode;
56 import com.sun.tools.javac.comp.DeferredAttr.LambdaReturnScanner;
57 import com.sun.tools.javac.comp.MatchBindingsComputer.MatchBindings;
58 import com.sun.tools.javac.jvm.*;
59
60 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.Diamond;
61 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.DiamondInvalidArg;
62 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.DiamondInvalidArgs;
63
64 import com.sun.tools.javac.resources.CompilerProperties.Errors;
65 import com.sun.tools.javac.resources.CompilerProperties.Fragments;
66 import com.sun.tools.javac.resources.CompilerProperties.Warnings;
67 import com.sun.tools.javac.tree.*;
68 import com.sun.tools.javac.tree.JCTree.*;
69 import com.sun.tools.javac.tree.JCTree.JCLambda.ParameterKind;
70 import com.sun.tools.javac.tree.JCTree.JCPolyExpression.*;
71 import com.sun.tools.javac.util.*;
72 import com.sun.tools.javac.util.DefinedBy.Api;
73 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
74 import com.sun.tools.javac.util.JCDiagnostic.Error;
75 import com.sun.tools.javac.util.JCDiagnostic.Fragment;
76 import com.sun.tools.javac.util.JCDiagnostic.Warning;
77 import com.sun.tools.javac.util.List;
78
79 import static com.sun.tools.javac.code.Flags.*;
80 import static com.sun.tools.javac.code.Flags.ANNOTATION;
81 import static com.sun.tools.javac.code.Flags.BLOCK;
82 import static com.sun.tools.javac.code.Kinds.*;
83 import static com.sun.tools.javac.code.Kinds.Kind.*;
84 import static com.sun.tools.javac.code.TypeTag.*;
85 import static com.sun.tools.javac.code.TypeTag.WILDCARD;
86 import static com.sun.tools.javac.tree.JCTree.Tag.*;
87 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticFlag;
88
89 /** This is the main context-dependent analysis phase in GJC. It
90 * encompasses name resolution, type checking and constant folding as
91 * subtasks. Some subtasks involve auxiliary classes.
92 * @see Check
93 * @see Resolve
94 * @see ConstFold
95 * @see Infer
96 *
97 * <p><b>This is NOT part of any supported API.
98 * If you write code that depends on this, you do so at your own risk.
99 * This code and its internal interfaces are subject to change or
100 * deletion without notice.</b>
101 */
102 public class Attr extends JCTree.Visitor {
103 protected static final Context.Key<Attr> attrKey = new Context.Key<>();
104
105 final Names names;
106 final Log log;
107 final Symtab syms;
108 final Resolve rs;
109 final Operators operators;
110 final Infer infer;
111 final Analyzer analyzer;
112 final DeferredAttr deferredAttr;
113 final Check chk;
114 final Flow flow;
115 final MemberEnter memberEnter;
116 final TypeEnter typeEnter;
117 final TreeMaker make;
118 final ConstFold cfolder;
119 final Enter enter;
120 final Target target;
121 final Types types;
122 final Preview preview;
123 final JCDiagnostic.Factory diags;
124 final TypeAnnotations typeAnnotations;
125 final DeferredLintHandler deferredLintHandler;
126 final TypeEnvs typeEnvs;
127 final Dependencies dependencies;
128 final Annotate annotate;
129 final ArgumentAttr argumentAttr;
130 final MatchBindingsComputer matchBindingsComputer;
131 final AttrRecover attrRecover;
132
133 public static Attr instance(Context context) {
134 Attr instance = context.get(attrKey);
135 if (instance == null)
136 instance = new Attr(context);
137 return instance;
138 }
139
140 @SuppressWarnings("this-escape")
141 protected Attr(Context context) {
142 context.put(attrKey, this);
143
144 names = Names.instance(context);
145 log = Log.instance(context);
146 syms = Symtab.instance(context);
147 rs = Resolve.instance(context);
148 operators = Operators.instance(context);
149 chk = Check.instance(context);
150 flow = Flow.instance(context);
151 memberEnter = MemberEnter.instance(context);
152 typeEnter = TypeEnter.instance(context);
153 make = TreeMaker.instance(context);
154 enter = Enter.instance(context);
155 infer = Infer.instance(context);
156 analyzer = Analyzer.instance(context);
157 deferredAttr = DeferredAttr.instance(context);
158 cfolder = ConstFold.instance(context);
159 target = Target.instance(context);
160 types = Types.instance(context);
161 preview = Preview.instance(context);
162 diags = JCDiagnostic.Factory.instance(context);
163 annotate = Annotate.instance(context);
164 typeAnnotations = TypeAnnotations.instance(context);
165 deferredLintHandler = DeferredLintHandler.instance(context);
166 typeEnvs = TypeEnvs.instance(context);
167 dependencies = Dependencies.instance(context);
168 argumentAttr = ArgumentAttr.instance(context);
169 matchBindingsComputer = MatchBindingsComputer.instance(context);
170 attrRecover = AttrRecover.instance(context);
171
172 Options options = Options.instance(context);
173
174 Source source = Source.instance(context);
175 allowReifiableTypesInInstanceof = Feature.REIFIABLE_TYPES_INSTANCEOF.allowedInSource(source);
176 allowRecords = Feature.RECORDS.allowedInSource(source);
177 allowPatternSwitch = (preview.isEnabled() || !preview.isPreview(Feature.PATTERN_SWITCH)) &&
178 Feature.PATTERN_SWITCH.allowedInSource(source);
179 allowUnconditionalPatternsInstanceOf =
180 Feature.UNCONDITIONAL_PATTERN_IN_INSTANCEOF.allowedInSource(source);
181 sourceName = source.name;
182 useBeforeDeclarationWarning = options.isSet("useBeforeDeclarationWarning");
183
184 statInfo = new ResultInfo(KindSelector.NIL, Type.noType);
185 varAssignmentInfo = new ResultInfo(KindSelector.ASG, Type.noType);
186 unknownExprInfo = new ResultInfo(KindSelector.VAL, Type.noType);
187 methodAttrInfo = new MethodAttrInfo();
188 unknownTypeInfo = new ResultInfo(KindSelector.TYP, Type.noType);
189 unknownTypeExprInfo = new ResultInfo(KindSelector.VAL_TYP, Type.noType);
190 recoveryInfo = new RecoveryInfo(deferredAttr.emptyDeferredAttrContext);
191 }
192
193 /** Switch: reifiable types in instanceof enabled?
194 */
195 boolean allowReifiableTypesInInstanceof;
196
197 /** Are records allowed
198 */
199 private final boolean allowRecords;
200
201 /** Are patterns in switch allowed
202 */
203 private final boolean allowPatternSwitch;
204
205 /** Are unconditional patterns in instanceof allowed
206 */
207 private final boolean allowUnconditionalPatternsInstanceOf;
208
209 /**
210 * Switch: warn about use of variable before declaration?
211 * RFE: 6425594
212 */
213 boolean useBeforeDeclarationWarning;
214
215 /**
216 * Switch: name of source level; used for error reporting.
217 */
218 String sourceName;
219
220 /** Check kind and type of given tree against protokind and prototype.
221 * If check succeeds, store type in tree and return it.
222 * If check fails, store errType in tree and return it.
223 * No checks are performed if the prototype is a method type.
224 * It is not necessary in this case since we know that kind and type
225 * are correct.
226 *
227 * @param tree The tree whose kind and type is checked
228 * @param found The computed type of the tree
229 * @param ownkind The computed kind of the tree
230 * @param resultInfo The expected result of the tree
231 */
232 Type check(final JCTree tree,
233 final Type found,
234 final KindSelector ownkind,
235 final ResultInfo resultInfo) {
236 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
237 Type owntype;
238 boolean shouldCheck = !found.hasTag(ERROR) &&
239 !resultInfo.pt.hasTag(METHOD) &&
240 !resultInfo.pt.hasTag(FORALL);
241 if (shouldCheck && !ownkind.subset(resultInfo.pkind)) {
242 log.error(tree.pos(),
243 Errors.UnexpectedType(resultInfo.pkind.kindNames(),
244 ownkind.kindNames()));
245 owntype = types.createErrorType(found);
246 } else if (inferenceContext.free(found)) {
247 //delay the check if there are inference variables in the found type
248 //this means we are dealing with a partially inferred poly expression
249 owntype = shouldCheck ? resultInfo.pt : found;
250 if (resultInfo.checkMode.installPostInferenceHook()) {
251 inferenceContext.addFreeTypeListener(List.of(found),
252 instantiatedContext -> {
253 ResultInfo pendingResult =
254 resultInfo.dup(inferenceContext.asInstType(resultInfo.pt));
255 check(tree, inferenceContext.asInstType(found), ownkind, pendingResult);
256 });
257 }
258 } else {
259 owntype = shouldCheck ?
260 resultInfo.check(tree, found) :
261 found;
262 }
263 if (resultInfo.checkMode.updateTreeType()) {
264 tree.type = owntype;
265 }
266 return owntype;
267 }
268
269 /** Is given blank final variable assignable, i.e. in a scope where it
270 * may be assigned to even though it is final?
271 * @param v The blank final variable.
272 * @param env The current environment.
273 */
274 boolean isAssignableAsBlankFinal(VarSymbol v, Env<AttrContext> env) {
275 Symbol owner = env.info.scope.owner;
276 // owner refers to the innermost variable, method or
277 // initializer block declaration at this point.
278 boolean isAssignable =
279 v.owner == owner
280 ||
281 ((owner.name == names.init || // i.e. we are in a constructor
282 owner.kind == VAR || // i.e. we are in a variable initializer
283 (owner.flags() & BLOCK) != 0) // i.e. we are in an initializer block
284 &&
285 v.owner == owner.owner
286 &&
287 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env));
288 boolean insideCompactConstructor = env.enclMethod != null && TreeInfo.isCompactConstructor(env.enclMethod);
289 return isAssignable & !insideCompactConstructor;
290 }
291
292 /** Check that variable can be assigned to.
293 * @param pos The current source code position.
294 * @param v The assigned variable
295 * @param base If the variable is referred to in a Select, the part
296 * to the left of the `.', null otherwise.
297 * @param env The current environment.
298 */
299 void checkAssignable(DiagnosticPosition pos, VarSymbol v, JCTree base, Env<AttrContext> env) {
300 if (v.name == names._this) {
301 log.error(pos, Errors.CantAssignValToThis);
302 } else if ((v.flags() & FINAL) != 0 &&
303 ((v.flags() & HASINIT) != 0
304 ||
305 !((base == null ||
306 TreeInfo.isThisQualifier(base)) &&
307 isAssignableAsBlankFinal(v, env)))) {
308 if (v.isResourceVariable()) { //TWR resource
309 log.error(pos, Errors.TryResourceMayNotBeAssigned(v));
310 } else {
311 log.error(pos, Errors.CantAssignValToVar(Flags.toSource(v.flags() & (STATIC | FINAL)), v));
312 }
313 }
314 }
315
316 /** Does tree represent a static reference to an identifier?
317 * It is assumed that tree is either a SELECT or an IDENT.
318 * We have to weed out selects from non-type names here.
319 * @param tree The candidate tree.
320 */
321 boolean isStaticReference(JCTree tree) {
322 if (tree.hasTag(SELECT)) {
323 Symbol lsym = TreeInfo.symbol(((JCFieldAccess) tree).selected);
324 if (lsym == null || lsym.kind != TYP) {
325 return false;
326 }
327 }
328 return true;
329 }
330
331 /** Is this symbol a type?
332 */
333 static boolean isType(Symbol sym) {
334 return sym != null && sym.kind == TYP;
335 }
336
337 /** Attribute a parsed identifier.
338 * @param tree Parsed identifier name
339 * @param topLevel The toplevel to use
340 */
341 public Symbol attribIdent(JCTree tree, JCCompilationUnit topLevel) {
342 Env<AttrContext> localEnv = enter.topLevelEnv(topLevel);
343 localEnv.enclClass = make.ClassDef(make.Modifiers(0),
344 syms.errSymbol.name,
345 null, null, null, null);
346 localEnv.enclClass.sym = syms.errSymbol;
347 return attribIdent(tree, localEnv);
348 }
349
350 /** Attribute a parsed identifier.
351 * @param tree Parsed identifier name
352 * @param env The env to use
353 */
354 public Symbol attribIdent(JCTree tree, Env<AttrContext> env) {
355 return tree.accept(identAttributer, env);
356 }
357 // where
358 private TreeVisitor<Symbol,Env<AttrContext>> identAttributer = new IdentAttributer();
359 private class IdentAttributer extends SimpleTreeVisitor<Symbol,Env<AttrContext>> {
360 @Override @DefinedBy(Api.COMPILER_TREE)
361 public Symbol visitMemberSelect(MemberSelectTree node, Env<AttrContext> env) {
362 Symbol site = visit(node.getExpression(), env);
363 if (site.kind == ERR || site.kind == ABSENT_TYP || site.kind == HIDDEN)
364 return site;
365 Name name = (Name)node.getIdentifier();
366 if (site.kind == PCK) {
367 env.toplevel.packge = (PackageSymbol)site;
368 return rs.findIdentInPackage(null, env, (TypeSymbol)site, name,
369 KindSelector.TYP_PCK);
370 } else {
371 env.enclClass.sym = (ClassSymbol)site;
372 return rs.findMemberType(env, site.asType(), name, (TypeSymbol)site);
373 }
374 }
375
376 @Override @DefinedBy(Api.COMPILER_TREE)
377 public Symbol visitIdentifier(IdentifierTree node, Env<AttrContext> env) {
378 return rs.findIdent(null, env, (Name)node.getName(), KindSelector.TYP_PCK);
379 }
380 }
381
382 public Type coerce(Type etype, Type ttype) {
383 return cfolder.coerce(etype, ttype);
384 }
385
386 public Type attribType(JCTree node, TypeSymbol sym) {
387 Env<AttrContext> env = typeEnvs.get(sym);
388 Env<AttrContext> localEnv = env.dup(node, env.info.dup());
389 return attribTree(node, localEnv, unknownTypeInfo);
390 }
391
392 public Type attribImportQualifier(JCImport tree, Env<AttrContext> env) {
393 // Attribute qualifying package or class.
394 JCFieldAccess s = tree.qualid;
395 return attribTree(s.selected, env,
396 new ResultInfo(tree.staticImport ?
397 KindSelector.TYP : KindSelector.TYP_PCK,
398 Type.noType));
399 }
400
401 public Env<AttrContext> attribExprToTree(JCTree expr, Env<AttrContext> env, JCTree tree) {
402 return attribToTree(expr, env, tree, unknownExprInfo);
403 }
404
405 public Env<AttrContext> attribStatToTree(JCTree stmt, Env<AttrContext> env, JCTree tree) {
406 return attribToTree(stmt, env, tree, statInfo);
407 }
408
409 private Env<AttrContext> attribToTree(JCTree root, Env<AttrContext> env, JCTree tree, ResultInfo resultInfo) {
410 breakTree = tree;
411 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
412 try {
413 deferredAttr.attribSpeculative(root, env, resultInfo,
414 null, DeferredAttr.AttributionMode.ATTRIB_TO_TREE,
415 argumentAttr.withLocalCacheContext());
416 attrRecover.doRecovery();
417 } catch (BreakAttr b) {
418 return b.env;
419 } catch (AssertionError ae) {
420 if (ae.getCause() instanceof BreakAttr breakAttr) {
421 return breakAttr.env;
422 } else {
423 throw ae;
424 }
425 } finally {
426 breakTree = null;
427 log.useSource(prev);
428 }
429 return env;
430 }
431
432 public <R> R runWithAttributedMethod(Env<AttrContext> env, JCMethodDecl tree, Function<JCBlock, R> attributedAction) {
433 JavaFileObject prevSource = log.useSource(env.toplevel.sourcefile);
434 try {
435 JCBlock dupTree = (JCBlock)deferredAttr.attribSpeculative(tree.body, env, statInfo,
436 null, DeferredAttr.AttributionMode.ATTRIB_TO_TREE,
437 argumentAttr.withLocalCacheContext());
438 return attributedAction.apply(dupTree);
439 } finally {
440 attrRecover.doRecovery();
441 log.useSource(prevSource);
442 }
443 }
444
445 private JCTree breakTree = null;
446
447 private static class BreakAttr extends RuntimeException {
448 static final long serialVersionUID = -6924771130405446405L;
449 private transient Env<AttrContext> env;
450 private BreakAttr(Env<AttrContext> env) {
451 this.env = env;
452 }
453 }
454
455 /**
456 * Mode controlling behavior of Attr.Check
457 */
458 enum CheckMode {
459
460 NORMAL,
461
462 /**
463 * Mode signalling 'fake check' - skip tree update. A side-effect of this mode is
464 * that the captured var cache in {@code InferenceContext} will be used in read-only
465 * mode when performing inference checks.
466 */
467 NO_TREE_UPDATE {
468 @Override
469 public boolean updateTreeType() {
470 return false;
471 }
472 },
473 /**
474 * Mode signalling that caller will manage free types in tree decorations.
475 */
476 NO_INFERENCE_HOOK {
477 @Override
478 public boolean installPostInferenceHook() {
479 return false;
480 }
481 };
482
483 public boolean updateTreeType() {
484 return true;
485 }
486 public boolean installPostInferenceHook() {
487 return true;
488 }
489 }
490
491
492 class ResultInfo {
493 final KindSelector pkind;
494 final Type pt;
495 final CheckContext checkContext;
496 final CheckMode checkMode;
497
498 ResultInfo(KindSelector pkind, Type pt) {
499 this(pkind, pt, chk.basicHandler, CheckMode.NORMAL);
500 }
501
502 ResultInfo(KindSelector pkind, Type pt, CheckMode checkMode) {
503 this(pkind, pt, chk.basicHandler, checkMode);
504 }
505
506 protected ResultInfo(KindSelector pkind,
507 Type pt, CheckContext checkContext) {
508 this(pkind, pt, checkContext, CheckMode.NORMAL);
509 }
510
511 protected ResultInfo(KindSelector pkind,
512 Type pt, CheckContext checkContext, CheckMode checkMode) {
513 this.pkind = pkind;
514 this.pt = pt;
515 this.checkContext = checkContext;
516 this.checkMode = checkMode;
517 }
518
519 /**
520 * Should {@link Attr#attribTree} use the {@code ArgumentAttr} visitor instead of this one?
521 * @param tree The tree to be type-checked.
522 * @return true if {@code ArgumentAttr} should be used.
523 */
524 protected boolean needsArgumentAttr(JCTree tree) { return false; }
525
526 protected Type check(final DiagnosticPosition pos, final Type found) {
527 return chk.checkType(pos, found, pt, checkContext);
528 }
529
530 protected ResultInfo dup(Type newPt) {
531 return new ResultInfo(pkind, newPt, checkContext, checkMode);
532 }
533
534 protected ResultInfo dup(CheckContext newContext) {
535 return new ResultInfo(pkind, pt, newContext, checkMode);
536 }
537
538 protected ResultInfo dup(Type newPt, CheckContext newContext) {
539 return new ResultInfo(pkind, newPt, newContext, checkMode);
540 }
541
542 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) {
543 return new ResultInfo(pkind, newPt, newContext, newMode);
544 }
545
546 protected ResultInfo dup(CheckMode newMode) {
547 return new ResultInfo(pkind, pt, checkContext, newMode);
548 }
549
550 @Override
551 public String toString() {
552 if (pt != null) {
553 return pt.toString();
554 } else {
555 return "";
556 }
557 }
558 }
559
560 class MethodAttrInfo extends ResultInfo {
561 public MethodAttrInfo() {
562 this(chk.basicHandler);
563 }
564
565 public MethodAttrInfo(CheckContext checkContext) {
566 super(KindSelector.VAL, Infer.anyPoly, checkContext);
567 }
568
569 @Override
570 protected boolean needsArgumentAttr(JCTree tree) {
571 return true;
572 }
573
574 protected ResultInfo dup(Type newPt) {
575 throw new IllegalStateException();
576 }
577
578 protected ResultInfo dup(CheckContext newContext) {
579 return new MethodAttrInfo(newContext);
580 }
581
582 protected ResultInfo dup(Type newPt, CheckContext newContext) {
583 throw new IllegalStateException();
584 }
585
586 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) {
587 throw new IllegalStateException();
588 }
589
590 protected ResultInfo dup(CheckMode newMode) {
591 throw new IllegalStateException();
592 }
593 }
594
595 class RecoveryInfo extends ResultInfo {
596
597 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext) {
598 this(deferredAttrContext, Type.recoveryType);
599 }
600
601 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext, Type pt) {
602 super(KindSelector.VAL, pt, new Check.NestedCheckContext(chk.basicHandler) {
603 @Override
604 public DeferredAttr.DeferredAttrContext deferredAttrContext() {
605 return deferredAttrContext;
606 }
607 @Override
608 public boolean compatible(Type found, Type req, Warner warn) {
609 return true;
610 }
611 @Override
612 public void report(DiagnosticPosition pos, JCDiagnostic details) {
613 boolean needsReport = pt == Type.recoveryType ||
614 (details.getDiagnosticPosition() != null &&
615 details.getDiagnosticPosition().getTree().hasTag(LAMBDA));
616 if (needsReport) {
617 chk.basicHandler.report(pos, details);
618 }
619 }
620 });
621 }
622 }
623
624 final ResultInfo statInfo;
625 final ResultInfo varAssignmentInfo;
626 final ResultInfo methodAttrInfo;
627 final ResultInfo unknownExprInfo;
628 final ResultInfo unknownTypeInfo;
629 final ResultInfo unknownTypeExprInfo;
630 final ResultInfo recoveryInfo;
631
632 Type pt() {
633 return resultInfo.pt;
634 }
635
636 KindSelector pkind() {
637 return resultInfo.pkind;
638 }
639
640 /* ************************************************************************
641 * Visitor methods
642 *************************************************************************/
643
644 /** Visitor argument: the current environment.
645 */
646 Env<AttrContext> env;
647
648 /** Visitor argument: the currently expected attribution result.
649 */
650 ResultInfo resultInfo;
651
652 /** Visitor result: the computed type.
653 */
654 Type result;
655
656 MatchBindings matchBindings = MatchBindingsComputer.EMPTY;
657
658 /** Visitor method: attribute a tree, catching any completion failure
659 * exceptions. Return the tree's type.
660 *
661 * @param tree The tree to be visited.
662 * @param env The environment visitor argument.
663 * @param resultInfo The result info visitor argument.
664 */
665 Type attribTree(JCTree tree, Env<AttrContext> env, ResultInfo resultInfo) {
666 Env<AttrContext> prevEnv = this.env;
667 ResultInfo prevResult = this.resultInfo;
668 try {
669 this.env = env;
670 this.resultInfo = resultInfo;
671 if (resultInfo.needsArgumentAttr(tree)) {
672 result = argumentAttr.attribArg(tree, env);
673 } else {
674 tree.accept(this);
675 }
676 matchBindings = matchBindingsComputer.finishBindings(tree,
677 matchBindings);
678 if (tree == breakTree &&
679 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
680 breakTreeFound(copyEnv(env));
681 }
682 return result;
683 } catch (CompletionFailure ex) {
684 tree.type = syms.errType;
685 return chk.completionError(tree.pos(), ex);
686 } finally {
687 this.env = prevEnv;
688 this.resultInfo = prevResult;
689 }
690 }
691
692 protected void breakTreeFound(Env<AttrContext> env) {
693 throw new BreakAttr(env);
694 }
695
696 Env<AttrContext> copyEnv(Env<AttrContext> env) {
697 Env<AttrContext> newEnv =
698 env.dup(env.tree, env.info.dup(copyScope(env.info.scope)));
699 if (newEnv.outer != null) {
700 newEnv.outer = copyEnv(newEnv.outer);
701 }
702 return newEnv;
703 }
704
705 WriteableScope copyScope(WriteableScope sc) {
706 WriteableScope newScope = WriteableScope.create(sc.owner);
707 List<Symbol> elemsList = List.nil();
708 for (Symbol sym : sc.getSymbols()) {
709 elemsList = elemsList.prepend(sym);
710 }
711 for (Symbol s : elemsList) {
712 newScope.enter(s);
713 }
714 return newScope;
715 }
716
717 /** Derived visitor method: attribute an expression tree.
718 */
719 public Type attribExpr(JCTree tree, Env<AttrContext> env, Type pt) {
720 return attribTree(tree, env, new ResultInfo(KindSelector.VAL, !pt.hasTag(ERROR) ? pt : Type.noType));
721 }
722
723 /** Derived visitor method: attribute an expression tree with
724 * no constraints on the computed type.
725 */
726 public Type attribExpr(JCTree tree, Env<AttrContext> env) {
727 return attribTree(tree, env, unknownExprInfo);
728 }
729
730 /** Derived visitor method: attribute a type tree.
731 */
732 public Type attribType(JCTree tree, Env<AttrContext> env) {
733 Type result = attribType(tree, env, Type.noType);
734 return result;
735 }
736
737 /** Derived visitor method: attribute a type tree.
738 */
739 Type attribType(JCTree tree, Env<AttrContext> env, Type pt) {
740 Type result = attribTree(tree, env, new ResultInfo(KindSelector.TYP, pt));
741 return result;
742 }
743
744 /** Derived visitor method: attribute a statement or definition tree.
745 */
746 public Type attribStat(JCTree tree, Env<AttrContext> env) {
747 Env<AttrContext> analyzeEnv = analyzer.copyEnvIfNeeded(tree, env);
748 Type result = attribTree(tree, env, statInfo);
749 analyzer.analyzeIfNeeded(tree, analyzeEnv);
750 attrRecover.doRecovery();
751 return result;
752 }
753
754 /** Attribute a list of expressions, returning a list of types.
755 */
756 List<Type> attribExprs(List<JCExpression> trees, Env<AttrContext> env, Type pt) {
757 ListBuffer<Type> ts = new ListBuffer<>();
758 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
759 ts.append(attribExpr(l.head, env, pt));
760 return ts.toList();
761 }
762
763 /** Attribute a list of statements, returning nothing.
764 */
765 <T extends JCTree> void attribStats(List<T> trees, Env<AttrContext> env) {
766 for (List<T> l = trees; l.nonEmpty(); l = l.tail)
767 attribStat(l.head, env);
768 }
769
770 /** Attribute the arguments in a method call, returning the method kind.
771 */
772 KindSelector attribArgs(KindSelector initialKind, List<JCExpression> trees, Env<AttrContext> env, ListBuffer<Type> argtypes) {
773 KindSelector kind = initialKind;
774 for (JCExpression arg : trees) {
775 Type argtype = chk.checkNonVoid(arg, attribTree(arg, env, methodAttrInfo));
776 if (argtype.hasTag(DEFERRED)) {
777 kind = KindSelector.of(KindSelector.POLY, kind);
778 }
779 argtypes.append(argtype);
780 }
781 return kind;
782 }
783
784 /** Attribute a type argument list, returning a list of types.
785 * Caller is responsible for calling checkRefTypes.
786 */
787 List<Type> attribAnyTypes(List<JCExpression> trees, Env<AttrContext> env) {
788 ListBuffer<Type> argtypes = new ListBuffer<>();
789 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
790 argtypes.append(attribType(l.head, env));
791 return argtypes.toList();
792 }
793
794 /** Attribute a type argument list, returning a list of types.
795 * Check that all the types are references.
796 */
797 List<Type> attribTypes(List<JCExpression> trees, Env<AttrContext> env) {
798 List<Type> types = attribAnyTypes(trees, env);
799 return chk.checkRefTypes(trees, types);
800 }
801
802 /**
803 * Attribute type variables (of generic classes or methods).
804 * Compound types are attributed later in attribBounds.
805 * @param typarams the type variables to enter
806 * @param env the current environment
807 */
808 void attribTypeVariables(List<JCTypeParameter> typarams, Env<AttrContext> env, boolean checkCyclic) {
809 for (JCTypeParameter tvar : typarams) {
810 TypeVar a = (TypeVar)tvar.type;
811 a.tsym.flags_field |= UNATTRIBUTED;
812 a.setUpperBound(Type.noType);
813 if (!tvar.bounds.isEmpty()) {
814 List<Type> bounds = List.of(attribType(tvar.bounds.head, env));
815 for (JCExpression bound : tvar.bounds.tail)
816 bounds = bounds.prepend(attribType(bound, env));
817 types.setBounds(a, bounds.reverse());
818 } else {
819 // if no bounds are given, assume a single bound of
820 // java.lang.Object.
821 types.setBounds(a, List.of(syms.objectType));
822 }
823 a.tsym.flags_field &= ~UNATTRIBUTED;
824 }
825 if (checkCyclic) {
826 for (JCTypeParameter tvar : typarams) {
827 chk.checkNonCyclic(tvar.pos(), (TypeVar)tvar.type);
828 }
829 }
830 }
831
832 /**
833 * Attribute the type references in a list of annotations.
834 */
835 void attribAnnotationTypes(List<JCAnnotation> annotations,
836 Env<AttrContext> env) {
837 for (List<JCAnnotation> al = annotations; al.nonEmpty(); al = al.tail) {
838 JCAnnotation a = al.head;
839 attribType(a.annotationType, env);
840 }
841 }
842
843 /**
844 * Attribute a "lazy constant value".
845 * @param env The env for the const value
846 * @param variable The initializer for the const value
847 * @param type The expected type, or null
848 * @see VarSymbol#setLazyConstValue
849 */
850 public Object attribLazyConstantValue(Env<AttrContext> env,
851 JCVariableDecl variable,
852 Type type) {
853
854 DiagnosticPosition prevLintPos
855 = deferredLintHandler.setPos(variable.pos());
856
857 final JavaFileObject prevSource = log.useSource(env.toplevel.sourcefile);
858 try {
859 Type itype = attribExpr(variable.init, env, type);
860 if (variable.isImplicitlyTyped()) {
861 //fixup local variable type
862 type = variable.type = variable.sym.type = chk.checkLocalVarType(variable, itype, variable.name);
863 }
864 if (itype.constValue() != null) {
865 return coerce(itype, type).constValue();
866 } else {
867 return null;
868 }
869 } finally {
870 log.useSource(prevSource);
871 deferredLintHandler.setPos(prevLintPos);
872 }
873 }
874
875 /** Attribute type reference in an `extends' or `implements' clause.
876 * Supertypes of anonymous inner classes are usually already attributed.
877 *
878 * @param tree The tree making up the type reference.
879 * @param env The environment current at the reference.
880 * @param classExpected true if only a class is expected here.
881 * @param interfaceExpected true if only an interface is expected here.
882 */
883 Type attribBase(JCTree tree,
884 Env<AttrContext> env,
885 boolean classExpected,
886 boolean interfaceExpected,
887 boolean checkExtensible) {
888 Type t = tree.type != null ?
889 tree.type :
890 attribType(tree, env);
891 try {
892 return checkBase(t, tree, env, classExpected, interfaceExpected, checkExtensible);
893 } catch (CompletionFailure ex) {
894 chk.completionError(tree.pos(), ex);
895 return t;
896 }
897 }
898 Type checkBase(Type t,
899 JCTree tree,
900 Env<AttrContext> env,
901 boolean classExpected,
902 boolean interfaceExpected,
903 boolean checkExtensible) {
904 final DiagnosticPosition pos = tree.hasTag(TYPEAPPLY) ?
905 (((JCTypeApply) tree).clazz).pos() : tree.pos();
906 if (t.tsym.isAnonymous()) {
907 log.error(pos, Errors.CantInheritFromAnon);
908 return types.createErrorType(t);
909 }
910 if (t.isErroneous())
911 return t;
912 if (t.hasTag(TYPEVAR) && !classExpected && !interfaceExpected) {
913 // check that type variable is already visible
914 if (t.getUpperBound() == null) {
915 log.error(pos, Errors.IllegalForwardRef);
916 return types.createErrorType(t);
917 }
918 } else {
919 t = chk.checkClassType(pos, t, checkExtensible);
920 }
921 if (interfaceExpected && (t.tsym.flags() & INTERFACE) == 0) {
922 log.error(pos, Errors.IntfExpectedHere);
923 // return errType is necessary since otherwise there might
924 // be undetected cycles which cause attribution to loop
925 return types.createErrorType(t);
926 } else if (checkExtensible &&
927 classExpected &&
928 (t.tsym.flags() & INTERFACE) != 0) {
929 log.error(pos, Errors.NoIntfExpectedHere);
930 return types.createErrorType(t);
931 }
932 if (checkExtensible &&
933 ((t.tsym.flags() & FINAL) != 0)) {
934 log.error(pos,
935 Errors.CantInheritFromFinal(t.tsym));
936 }
937 chk.checkNonCyclic(pos, t);
938 return t;
939 }
940
941 Type attribIdentAsEnumType(Env<AttrContext> env, JCIdent id) {
942 Assert.check((env.enclClass.sym.flags() & ENUM) != 0);
943 id.type = env.info.scope.owner.enclClass().type;
944 id.sym = env.info.scope.owner.enclClass();
945 return id.type;
946 }
947
948 public void visitClassDef(JCClassDecl tree) {
949 Optional<ArgumentAttr.LocalCacheContext> localCacheContext =
950 Optional.ofNullable(env.info.attributionMode.isSpeculative ?
951 argumentAttr.withLocalCacheContext() : null);
952 boolean ctorProloguePrev = env.info.ctorPrologue;
953 env.info.ctorPrologue = false;
954 try {
955 // Local and anonymous classes have not been entered yet, so we need to
956 // do it now.
957 if (env.info.scope.owner.kind.matches(KindSelector.VAL_MTH)) {
958 enter.classEnter(tree, env);
959 } else {
960 // If this class declaration is part of a class level annotation,
961 // as in @MyAnno(new Object() {}) class MyClass {}, enter it in
962 // order to simplify later steps and allow for sensible error
963 // messages.
964 if (env.tree.hasTag(NEWCLASS) && TreeInfo.isInAnnotation(env, tree))
965 enter.classEnter(tree, env);
966 }
967
968 ClassSymbol c = tree.sym;
969 if (c == null) {
970 // exit in case something drastic went wrong during enter.
971 result = null;
972 } else {
973 // make sure class has been completed:
974 c.complete();
975
976 // If a class declaration appears in a constructor prologue,
977 // that means it's either a local class or an anonymous class.
978 // Either way, there is no immediately enclosing instance.
979 if (ctorProloguePrev) {
980 c.flags_field |= NOOUTERTHIS;
981 }
982 attribClass(tree.pos(), c);
983 result = tree.type = c.type;
984 }
985 } finally {
986 localCacheContext.ifPresent(LocalCacheContext::leave);
987 env.info.ctorPrologue = ctorProloguePrev;
988 }
989 }
990
991 public void visitMethodDef(JCMethodDecl tree) {
992 MethodSymbol m = tree.sym;
993 boolean isDefaultMethod = (m.flags() & DEFAULT) != 0;
994
995 Lint lint = env.info.lint.augment(m);
996 Lint prevLint = chk.setLint(lint);
997 boolean ctorProloguePrev = env.info.ctorPrologue;
998 env.info.ctorPrologue = false;
999 MethodSymbol prevMethod = chk.setMethod(m);
1000 try {
1001 deferredLintHandler.flush(tree.pos(), lint);
1002 chk.checkDeprecatedAnnotation(tree.pos(), m);
1003
1004
1005 // Create a new environment with local scope
1006 // for attributing the method.
1007 Env<AttrContext> localEnv = memberEnter.methodEnv(tree, env);
1008 localEnv.info.lint = lint;
1009
1010 attribStats(tree.typarams, localEnv);
1011
1012 // If we override any other methods, check that we do so properly.
1013 // JLS ???
1014 if (m.isStatic()) {
1015 chk.checkHideClashes(tree.pos(), env.enclClass.type, m);
1016 } else {
1017 chk.checkOverrideClashes(tree.pos(), env.enclClass.type, m);
1018 }
1019 chk.checkOverride(env, tree, m);
1020
1021 if (isDefaultMethod && types.overridesObjectMethod(m.enclClass(), m)) {
1022 log.error(tree, Errors.DefaultOverridesObjectMember(m.name, Kinds.kindName(m.location()), m.location()));
1023 }
1024
1025 // Enter all type parameters into the local method scope.
1026 for (List<JCTypeParameter> l = tree.typarams; l.nonEmpty(); l = l.tail)
1027 localEnv.info.scope.enterIfAbsent(l.head.type.tsym);
1028
1029 ClassSymbol owner = env.enclClass.sym;
1030 if ((owner.flags() & ANNOTATION) != 0 &&
1031 (tree.params.nonEmpty() ||
1032 tree.recvparam != null))
1033 log.error(tree.params.nonEmpty() ?
1034 tree.params.head.pos() :
1035 tree.recvparam.pos(),
1036 Errors.IntfAnnotationMembersCantHaveParams);
1037
1038 // Attribute all value parameters.
1039 for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) {
1040 attribStat(l.head, localEnv);
1041 }
1042
1043 chk.checkVarargsMethodDecl(localEnv, tree);
1044
1045 // Check that type parameters are well-formed.
1046 chk.validate(tree.typarams, localEnv);
1047
1048 // Check that result type is well-formed.
1049 if (tree.restype != null && !tree.restype.type.hasTag(VOID))
1050 chk.validate(tree.restype, localEnv);
1051
1052 // Check that receiver type is well-formed.
1053 if (tree.recvparam != null) {
1054 // Use a new environment to check the receiver parameter.
1055 // Otherwise I get "might not have been initialized" errors.
1056 // Is there a better way?
1057 Env<AttrContext> newEnv = memberEnter.methodEnv(tree, env);
1058 attribType(tree.recvparam, newEnv);
1059 chk.validate(tree.recvparam, newEnv);
1060 }
1061
1062 // Is this method a constructor?
1063 boolean isConstructor = TreeInfo.isConstructor(tree);
1064
1065 if (env.enclClass.sym.isRecord() && tree.sym.owner.kind == TYP) {
1066 // lets find if this method is an accessor
1067 Optional<? extends RecordComponent> recordComponent = env.enclClass.sym.getRecordComponents().stream()
1068 .filter(rc -> rc.accessor == tree.sym && (rc.accessor.flags_field & GENERATED_MEMBER) == 0).findFirst();
1069 if (recordComponent.isPresent()) {
1070 // the method is a user defined accessor lets check that everything is fine
1071 if (!tree.sym.isPublic()) {
1072 log.error(tree, Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.MethodMustBePublic));
1073 }
1074 if (!types.isSameType(tree.sym.type.getReturnType(), recordComponent.get().type)) {
1075 log.error(tree, Errors.InvalidAccessorMethodInRecord(env.enclClass.sym,
1076 Fragments.AccessorReturnTypeDoesntMatch(tree.sym, recordComponent.get())));
1077 }
1078 if (tree.sym.type.asMethodType().thrown != null && !tree.sym.type.asMethodType().thrown.isEmpty()) {
1079 log.error(tree,
1080 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodCantThrowException));
1081 }
1082 if (!tree.typarams.isEmpty()) {
1083 log.error(tree,
1084 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodMustNotBeGeneric));
1085 }
1086 if (tree.sym.isStatic()) {
1087 log.error(tree,
1088 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodMustNotBeStatic));
1089 }
1090 }
1091
1092 if (isConstructor) {
1093 // if this a constructor other than the canonical one
1094 if ((tree.sym.flags_field & RECORD) == 0) {
1095 if (!TreeInfo.hasConstructorCall(tree, names._this)) {
1096 log.error(tree, Errors.NonCanonicalConstructorInvokeAnotherConstructor(env.enclClass.sym));
1097 }
1098 } else {
1099 // but if it is the canonical:
1100
1101 /* if user generated, then it shouldn't:
1102 * - have an accessibility stricter than that of the record type
1103 * - explicitly invoke any other constructor
1104 */
1105 if ((tree.sym.flags_field & GENERATEDCONSTR) == 0) {
1106 if (Check.protection(m.flags()) > Check.protection(env.enclClass.sym.flags())) {
1107 log.error(tree,
1108 (env.enclClass.sym.flags() & AccessFlags) == 0 ?
1109 Errors.InvalidCanonicalConstructorInRecord(
1110 Fragments.Canonical,
1111 env.enclClass.sym.name,
1112 Fragments.CanonicalMustNotHaveStrongerAccess("package")
1113 ) :
1114 Errors.InvalidCanonicalConstructorInRecord(
1115 Fragments.Canonical,
1116 env.enclClass.sym.name,
1117 Fragments.CanonicalMustNotHaveStrongerAccess(asFlagSet(env.enclClass.sym.flags() & AccessFlags))
1118 )
1119 );
1120 }
1121
1122 if (TreeInfo.hasAnyConstructorCall(tree)) {
1123 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1124 Fragments.Canonical, env.enclClass.sym.name,
1125 Fragments.CanonicalMustNotContainExplicitConstructorInvocation));
1126 }
1127 }
1128
1129 // also we want to check that no type variables have been defined
1130 if (!tree.typarams.isEmpty()) {
1131 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1132 Fragments.Canonical, env.enclClass.sym.name, Fragments.CanonicalMustNotDeclareTypeVariables));
1133 }
1134
1135 /* and now we need to check that the constructor's arguments are exactly the same as those of the
1136 * record components
1137 */
1138 List<? extends RecordComponent> recordComponents = env.enclClass.sym.getRecordComponents();
1139 List<Type> recordFieldTypes = TreeInfo.recordFields(env.enclClass).map(vd -> vd.sym.type);
1140 for (JCVariableDecl param: tree.params) {
1141 boolean paramIsVarArgs = (param.sym.flags_field & VARARGS) != 0;
1142 if (!types.isSameType(param.type, recordFieldTypes.head) ||
1143 (recordComponents.head.isVarargs() != paramIsVarArgs)) {
1144 log.error(param, Errors.InvalidCanonicalConstructorInRecord(
1145 Fragments.Canonical, env.enclClass.sym.name,
1146 Fragments.TypeMustBeIdenticalToCorrespondingRecordComponentType));
1147 }
1148 recordComponents = recordComponents.tail;
1149 recordFieldTypes = recordFieldTypes.tail;
1150 }
1151 }
1152 }
1153 }
1154
1155 // annotation method checks
1156 if ((owner.flags() & ANNOTATION) != 0) {
1157 // annotation method cannot have throws clause
1158 if (tree.thrown.nonEmpty()) {
1159 log.error(tree.thrown.head.pos(),
1160 Errors.ThrowsNotAllowedInIntfAnnotation);
1161 }
1162 // annotation method cannot declare type-parameters
1163 if (tree.typarams.nonEmpty()) {
1164 log.error(tree.typarams.head.pos(),
1165 Errors.IntfAnnotationMembersCantHaveTypeParams);
1166 }
1167 // validate annotation method's return type (could be an annotation type)
1168 chk.validateAnnotationType(tree.restype);
1169 // ensure that annotation method does not clash with members of Object/Annotation
1170 chk.validateAnnotationMethod(tree.pos(), m);
1171 }
1172
1173 for (List<JCExpression> l = tree.thrown; l.nonEmpty(); l = l.tail)
1174 chk.checkType(l.head.pos(), l.head.type, syms.throwableType);
1175
1176 if (tree.body == null) {
1177 // Empty bodies are only allowed for
1178 // abstract, native, or interface methods, or for methods
1179 // in a retrofit signature class.
1180 if (tree.defaultValue != null) {
1181 if ((owner.flags() & ANNOTATION) == 0)
1182 log.error(tree.pos(),
1183 Errors.DefaultAllowedInIntfAnnotationMember);
1184 }
1185 if (isDefaultMethod || (tree.sym.flags() & (ABSTRACT | NATIVE)) == 0)
1186 log.error(tree.pos(), Errors.MissingMethBodyOrDeclAbstract);
1187 } else {
1188 if ((tree.sym.flags() & (ABSTRACT|DEFAULT|PRIVATE)) == ABSTRACT) {
1189 if ((owner.flags() & INTERFACE) != 0) {
1190 log.error(tree.body.pos(), Errors.IntfMethCantHaveBody);
1191 } else {
1192 log.error(tree.pos(), Errors.AbstractMethCantHaveBody);
1193 }
1194 } else if ((tree.mods.flags & NATIVE) != 0) {
1195 log.error(tree.pos(), Errors.NativeMethCantHaveBody);
1196 }
1197 // Add an implicit super() call unless an explicit call to
1198 // super(...) or this(...) is given
1199 // or we are compiling class java.lang.Object.
1200 if (isConstructor && owner.type != syms.objectType) {
1201 if (!TreeInfo.hasAnyConstructorCall(tree)) {
1202 JCStatement supCall = make.at(tree.body.pos).Exec(make.Apply(List.nil(),
1203 make.Ident(names._super), make.Idents(List.nil())));
1204 tree.body.stats = tree.body.stats.prepend(supCall);
1205 } else if ((env.enclClass.sym.flags() & ENUM) != 0 &&
1206 (tree.mods.flags & GENERATEDCONSTR) == 0 &&
1207 TreeInfo.hasConstructorCall(tree, names._super)) {
1208 // enum constructors are not allowed to call super
1209 // directly, so make sure there aren't any super calls
1210 // in enum constructors, except in the compiler
1211 // generated one.
1212 log.error(tree.body.stats.head.pos(),
1213 Errors.CallToSuperNotAllowedInEnumCtor(env.enclClass.sym));
1214 }
1215 if (env.enclClass.sym.isRecord() && (tree.sym.flags_field & RECORD) != 0) { // we are seeing the canonical constructor
1216 List<Name> recordComponentNames = TreeInfo.recordFields(env.enclClass).map(vd -> vd.sym.name);
1217 List<Name> initParamNames = tree.sym.params.map(p -> p.name);
1218 if (!initParamNames.equals(recordComponentNames)) {
1219 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1220 Fragments.Canonical, env.enclClass.sym.name, Fragments.CanonicalWithNameMismatch));
1221 }
1222 if (tree.sym.type.asMethodType().thrown != null && !tree.sym.type.asMethodType().thrown.isEmpty()) {
1223 log.error(tree,
1224 Errors.InvalidCanonicalConstructorInRecord(
1225 TreeInfo.isCompactConstructor(tree) ? Fragments.Compact : Fragments.Canonical,
1226 env.enclClass.sym.name,
1227 Fragments.ThrowsClauseNotAllowedForCanonicalConstructor(
1228 TreeInfo.isCompactConstructor(tree) ? Fragments.Compact : Fragments.Canonical)));
1229 }
1230 }
1231 }
1232
1233 // Attribute all type annotations in the body
1234 annotate.queueScanTreeAndTypeAnnotate(tree.body, localEnv, m, null);
1235 annotate.flush();
1236
1237 // Start of constructor prologue
1238 localEnv.info.ctorPrologue = isConstructor;
1239
1240 // Attribute method body.
1241 attribStat(tree.body, localEnv);
1242 }
1243
1244 localEnv.info.scope.leave();
1245 result = tree.type = m.type;
1246 } finally {
1247 chk.setLint(prevLint);
1248 chk.setMethod(prevMethod);
1249 env.info.ctorPrologue = ctorProloguePrev;
1250 }
1251 }
1252
1253 public void visitVarDef(JCVariableDecl tree) {
1254 // Local variables have not been entered yet, so we need to do it now:
1255 if (env.info.scope.owner.kind == MTH || env.info.scope.owner.kind == VAR) {
1256 if (tree.sym != null) {
1257 // parameters have already been entered
1258 env.info.scope.enter(tree.sym);
1259 } else {
1260 if (tree.isImplicitlyTyped() && (tree.getModifiers().flags & PARAMETER) == 0) {
1261 if (tree.init == null) {
1262 //cannot use 'var' without initializer
1263 log.error(tree, Errors.CantInferLocalVarType(tree.name, Fragments.LocalMissingInit));
1264 tree.vartype = make.Erroneous();
1265 } else {
1266 Fragment msg = canInferLocalVarType(tree);
1267 if (msg != null) {
1268 //cannot use 'var' with initializer which require an explicit target
1269 //(e.g. lambda, method reference, array initializer).
1270 log.error(tree, Errors.CantInferLocalVarType(tree.name, msg));
1271 tree.vartype = make.Erroneous();
1272 }
1273 }
1274 }
1275 try {
1276 annotate.blockAnnotations();
1277 memberEnter.memberEnter(tree, env);
1278 } finally {
1279 annotate.unblockAnnotations();
1280 }
1281 }
1282 } else {
1283 if (tree.init != null) {
1284 // Field initializer expression need to be entered.
1285 annotate.queueScanTreeAndTypeAnnotate(tree.init, env, tree.sym, tree.pos());
1286 annotate.flush();
1287 }
1288 }
1289
1290 VarSymbol v = tree.sym;
1291 Lint lint = env.info.lint.augment(v);
1292 Lint prevLint = chk.setLint(lint);
1293
1294 // Check that the variable's declared type is well-formed.
1295 boolean isImplicitLambdaParameter = env.tree.hasTag(LAMBDA) &&
1296 ((JCLambda)env.tree).paramKind == JCLambda.ParameterKind.IMPLICIT &&
1297 (tree.sym.flags() & PARAMETER) != 0;
1298 chk.validate(tree.vartype, env, !isImplicitLambdaParameter && !tree.isImplicitlyTyped());
1299
1300 try {
1301 v.getConstValue(); // ensure compile-time constant initializer is evaluated
1302 deferredLintHandler.flush(tree.pos(), lint);
1303 chk.checkDeprecatedAnnotation(tree.pos(), v);
1304
1305 if (tree.init != null) {
1306 if ((v.flags_field & FINAL) == 0 ||
1307 !memberEnter.needsLazyConstValue(tree.init)) {
1308 // Not a compile-time constant
1309 // Attribute initializer in a new environment
1310 // with the declared variable as owner.
1311 // Check that initializer conforms to variable's declared type.
1312 Env<AttrContext> initEnv = memberEnter.initEnv(tree, env);
1313 initEnv.info.lint = lint;
1314 // In order to catch self-references, we set the variable's
1315 // declaration position to maximal possible value, effectively
1316 // marking the variable as undefined.
1317 initEnv.info.enclVar = v;
1318 attribExpr(tree.init, initEnv, v.type);
1319 if (tree.isImplicitlyTyped()) {
1320 //fixup local variable type
1321 v.type = chk.checkLocalVarType(tree, tree.init.type, tree.name);
1322 }
1323 }
1324 if (tree.isImplicitlyTyped()) {
1325 setSyntheticVariableType(tree, v.type);
1326 }
1327 }
1328 result = tree.type = v.type;
1329 if (env.enclClass.sym.isRecord() && tree.sym.owner.kind == TYP && !v.isStatic()) {
1330 if (isNonArgsMethodInObject(v.name)) {
1331 log.error(tree, Errors.IllegalRecordComponentName(v));
1332 }
1333 }
1334 }
1335 finally {
1336 chk.setLint(prevLint);
1337 }
1338 }
1339
1340 private boolean isNonArgsMethodInObject(Name name) {
1341 for (Symbol s : syms.objectType.tsym.members().getSymbolsByName(name, s -> s.kind == MTH)) {
1342 if (s.type.getParameterTypes().isEmpty()) {
1343 return true;
1344 }
1345 }
1346 return false;
1347 }
1348
1349 Fragment canInferLocalVarType(JCVariableDecl tree) {
1350 LocalInitScanner lis = new LocalInitScanner();
1351 lis.scan(tree.init);
1352 return lis.badInferenceMsg;
1353 }
1354
1355 static class LocalInitScanner extends TreeScanner {
1356 Fragment badInferenceMsg = null;
1357 boolean needsTarget = true;
1358
1359 @Override
1360 public void visitNewArray(JCNewArray tree) {
1361 if (tree.elemtype == null && needsTarget) {
1362 badInferenceMsg = Fragments.LocalArrayMissingTarget;
1363 }
1364 }
1365
1366 @Override
1367 public void visitLambda(JCLambda tree) {
1368 if (needsTarget) {
1369 badInferenceMsg = Fragments.LocalLambdaMissingTarget;
1370 }
1371 }
1372
1373 @Override
1374 public void visitTypeCast(JCTypeCast tree) {
1375 boolean prevNeedsTarget = needsTarget;
1376 try {
1377 needsTarget = false;
1378 super.visitTypeCast(tree);
1379 } finally {
1380 needsTarget = prevNeedsTarget;
1381 }
1382 }
1383
1384 @Override
1385 public void visitReference(JCMemberReference tree) {
1386 if (needsTarget) {
1387 badInferenceMsg = Fragments.LocalMrefMissingTarget;
1388 }
1389 }
1390
1391 @Override
1392 public void visitNewClass(JCNewClass tree) {
1393 boolean prevNeedsTarget = needsTarget;
1394 try {
1395 needsTarget = false;
1396 super.visitNewClass(tree);
1397 } finally {
1398 needsTarget = prevNeedsTarget;
1399 }
1400 }
1401
1402 @Override
1403 public void visitApply(JCMethodInvocation tree) {
1404 boolean prevNeedsTarget = needsTarget;
1405 try {
1406 needsTarget = false;
1407 super.visitApply(tree);
1408 } finally {
1409 needsTarget = prevNeedsTarget;
1410 }
1411 }
1412 }
1413
1414 public void visitSkip(JCSkip tree) {
1415 result = null;
1416 }
1417
1418 public void visitBlock(JCBlock tree) {
1419 if (env.info.scope.owner.kind == TYP || env.info.scope.owner.kind == ERR) {
1420 // Block is a static or instance initializer;
1421 // let the owner of the environment be a freshly
1422 // created BLOCK-method.
1423 Symbol fakeOwner =
1424 new MethodSymbol(tree.flags | BLOCK |
1425 env.info.scope.owner.flags() & STRICTFP, names.empty, null,
1426 env.info.scope.owner);
1427 final Env<AttrContext> localEnv =
1428 env.dup(tree, env.info.dup(env.info.scope.dupUnshared(fakeOwner)));
1429
1430 if ((tree.flags & STATIC) != 0) localEnv.info.staticLevel++;
1431 // Attribute all type annotations in the block
1432 annotate.queueScanTreeAndTypeAnnotate(tree, localEnv, localEnv.info.scope.owner, null);
1433 annotate.flush();
1434 attribStats(tree.stats, localEnv);
1435
1436 {
1437 // Store init and clinit type annotations with the ClassSymbol
1438 // to allow output in Gen.normalizeDefs.
1439 ClassSymbol cs = (ClassSymbol)env.info.scope.owner;
1440 List<Attribute.TypeCompound> tas = localEnv.info.scope.owner.getRawTypeAttributes();
1441 if ((tree.flags & STATIC) != 0) {
1442 cs.appendClassInitTypeAttributes(tas);
1443 } else {
1444 cs.appendInitTypeAttributes(tas);
1445 }
1446 }
1447 } else {
1448 // Create a new local environment with a local scope.
1449 Env<AttrContext> localEnv =
1450 env.dup(tree, env.info.dup(env.info.scope.dup()));
1451 try {
1452 attribStats(tree.stats, localEnv);
1453 } finally {
1454 localEnv.info.scope.leave();
1455 }
1456 }
1457 result = null;
1458 }
1459
1460 public void visitDoLoop(JCDoWhileLoop tree) {
1461 attribStat(tree.body, env.dup(tree));
1462 attribExpr(tree.cond, env, syms.booleanType);
1463 handleLoopConditionBindings(matchBindings, tree, tree.body);
1464 result = null;
1465 }
1466
1467 public void visitWhileLoop(JCWhileLoop tree) {
1468 attribExpr(tree.cond, env, syms.booleanType);
1469 MatchBindings condBindings = matchBindings;
1470 // include condition's bindings when true in the body:
1471 Env<AttrContext> whileEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
1472 try {
1473 attribStat(tree.body, whileEnv.dup(tree));
1474 } finally {
1475 whileEnv.info.scope.leave();
1476 }
1477 handleLoopConditionBindings(condBindings, tree, tree.body);
1478 result = null;
1479 }
1480
1481 public void visitForLoop(JCForLoop tree) {
1482 Env<AttrContext> loopEnv =
1483 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1484 MatchBindings condBindings = MatchBindingsComputer.EMPTY;
1485 try {
1486 attribStats(tree.init, loopEnv);
1487 if (tree.cond != null) {
1488 attribExpr(tree.cond, loopEnv, syms.booleanType);
1489 // include condition's bindings when true in the body and step:
1490 condBindings = matchBindings;
1491 }
1492 Env<AttrContext> bodyEnv = bindingEnv(loopEnv, condBindings.bindingsWhenTrue);
1493 try {
1494 bodyEnv.tree = tree; // before, we were not in loop!
1495 attribStats(tree.step, bodyEnv);
1496 attribStat(tree.body, bodyEnv);
1497 } finally {
1498 bodyEnv.info.scope.leave();
1499 }
1500 result = null;
1501 }
1502 finally {
1503 loopEnv.info.scope.leave();
1504 }
1505 handleLoopConditionBindings(condBindings, tree, tree.body);
1506 }
1507
1508 /**
1509 * Include condition's bindings when false after the loop, if cannot get out of the loop
1510 */
1511 private void handleLoopConditionBindings(MatchBindings condBindings,
1512 JCStatement loop,
1513 JCStatement loopBody) {
1514 if (condBindings.bindingsWhenFalse.nonEmpty() &&
1515 !breaksTo(env, loop, loopBody)) {
1516 addBindings2Scope(loop, condBindings.bindingsWhenFalse);
1517 }
1518 }
1519
1520 private boolean breaksTo(Env<AttrContext> env, JCTree loop, JCTree body) {
1521 preFlow(body);
1522 return flow.breaksToTree(env, loop, body, make);
1523 }
1524
1525 /**
1526 * Add given bindings to the current scope, unless there's a break to
1527 * an immediately enclosing labeled statement.
1528 */
1529 private void addBindings2Scope(JCStatement introducingStatement,
1530 List<BindingSymbol> bindings) {
1531 if (bindings.isEmpty()) {
1532 return ;
1533 }
1534
1535 var searchEnv = env;
1536 while (searchEnv.tree instanceof JCLabeledStatement labeled &&
1537 labeled.body == introducingStatement) {
1538 if (breaksTo(env, labeled, labeled.body)) {
1539 //breaking to an immediately enclosing labeled statement
1540 return ;
1541 }
1542 searchEnv = searchEnv.next;
1543 introducingStatement = labeled;
1544 }
1545
1546 //include condition's body when false after the while, if cannot get out of the loop
1547 bindings.forEach(env.info.scope::enter);
1548 bindings.forEach(BindingSymbol::preserveBinding);
1549 }
1550
1551 public void visitForeachLoop(JCEnhancedForLoop tree) {
1552 Env<AttrContext> loopEnv =
1553 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1554 try {
1555 //the Formal Parameter of a for-each loop is not in the scope when
1556 //attributing the for-each expression; we mimic this by attributing
1557 //the for-each expression first (against original scope).
1558 Type exprType = types.cvarUpperBound(attribExpr(tree.expr, loopEnv));
1559 chk.checkNonVoid(tree.pos(), exprType);
1560 Type elemtype = types.elemtype(exprType); // perhaps expr is an array?
1561 if (elemtype == null) {
1562 // or perhaps expr implements Iterable<T>?
1563 Type base = types.asSuper(exprType, syms.iterableType.tsym);
1564 if (base == null) {
1565 log.error(tree.expr.pos(),
1566 Errors.ForeachNotApplicableToType(exprType,
1567 Fragments.TypeReqArrayOrIterable));
1568 elemtype = types.createErrorType(exprType);
1569 } else {
1570 List<Type> iterableParams = base.allparams();
1571 elemtype = iterableParams.isEmpty()
1572 ? syms.objectType
1573 : types.wildUpperBound(iterableParams.head);
1574
1575 // Check the return type of the method iterator().
1576 // This is the bare minimum we need to verify to make sure code generation doesn't crash.
1577 Symbol iterSymbol = rs.resolveInternalMethod(tree.pos(),
1578 loopEnv, types.skipTypeVars(exprType, false), names.iterator, List.nil(), List.nil());
1579 if (types.asSuper(iterSymbol.type.getReturnType(), syms.iteratorType.tsym) == null) {
1580 log.error(tree.pos(),
1581 Errors.ForeachNotApplicableToType(exprType, Fragments.TypeReqArrayOrIterable));
1582 }
1583 }
1584 }
1585 if (tree.var.isImplicitlyTyped()) {
1586 Type inferredType = chk.checkLocalVarType(tree.var, elemtype, tree.var.name);
1587 setSyntheticVariableType(tree.var, inferredType);
1588 }
1589 attribStat(tree.var, loopEnv);
1590 chk.checkType(tree.expr.pos(), elemtype, tree.var.sym.type);
1591 loopEnv.tree = tree; // before, we were not in loop!
1592 attribStat(tree.body, loopEnv);
1593 result = null;
1594 }
1595 finally {
1596 loopEnv.info.scope.leave();
1597 }
1598 }
1599
1600 public void visitLabelled(JCLabeledStatement tree) {
1601 // Check that label is not used in an enclosing statement
1602 Env<AttrContext> env1 = env;
1603 while (env1 != null && !env1.tree.hasTag(CLASSDEF)) {
1604 if (env1.tree.hasTag(LABELLED) &&
1605 ((JCLabeledStatement) env1.tree).label == tree.label) {
1606 log.error(tree.pos(),
1607 Errors.LabelAlreadyInUse(tree.label));
1608 break;
1609 }
1610 env1 = env1.next;
1611 }
1612
1613 attribStat(tree.body, env.dup(tree));
1614 result = null;
1615 }
1616
1617 public void visitSwitch(JCSwitch tree) {
1618 handleSwitch(tree, tree.selector, tree.cases, (c, caseEnv) -> {
1619 attribStats(c.stats, caseEnv);
1620 });
1621 result = null;
1622 }
1623
1624 public void visitSwitchExpression(JCSwitchExpression tree) {
1625 boolean wrongContext = false;
1626
1627 tree.polyKind = (pt().hasTag(NONE) && pt() != Type.recoveryType && pt() != Infer.anyPoly) ?
1628 PolyKind.STANDALONE : PolyKind.POLY;
1629
1630 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) {
1631 //this means we are returning a poly conditional from void-compatible lambda expression
1632 resultInfo.checkContext.report(tree, diags.fragment(Fragments.SwitchExpressionTargetCantBeVoid));
1633 resultInfo = recoveryInfo;
1634 wrongContext = true;
1635 }
1636
1637 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ?
1638 unknownExprInfo :
1639 resultInfo.dup(switchExpressionContext(resultInfo.checkContext));
1640
1641 ListBuffer<DiagnosticPosition> caseTypePositions = new ListBuffer<>();
1642 ListBuffer<Type> caseTypes = new ListBuffer<>();
1643
1644 handleSwitch(tree, tree.selector, tree.cases, (c, caseEnv) -> {
1645 caseEnv.info.yieldResult = condInfo;
1646 attribStats(c.stats, caseEnv);
1647 new TreeScanner() {
1648 @Override
1649 public void visitYield(JCYield brk) {
1650 if (brk.target == tree) {
1651 caseTypePositions.append(brk.value != null ? brk.value.pos() : brk.pos());
1652 caseTypes.append(brk.value != null ? brk.value.type : syms.errType);
1653 }
1654 super.visitYield(brk);
1655 }
1656
1657 @Override public void visitClassDef(JCClassDecl tree) {}
1658 @Override public void visitLambda(JCLambda tree) {}
1659 }.scan(c.stats);
1660 });
1661
1662 if (tree.cases.isEmpty()) {
1663 log.error(tree.pos(),
1664 Errors.SwitchExpressionEmpty);
1665 } else if (caseTypes.isEmpty()) {
1666 log.error(tree.pos(),
1667 Errors.SwitchExpressionNoResultExpressions);
1668 }
1669
1670 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ? condType(caseTypePositions.toList(), caseTypes.toList()) : pt();
1671
1672 result = tree.type = wrongContext? types.createErrorType(pt()) : check(tree, owntype, KindSelector.VAL, resultInfo);
1673 }
1674 //where:
1675 CheckContext switchExpressionContext(CheckContext checkContext) {
1676 return new Check.NestedCheckContext(checkContext) {
1677 //this will use enclosing check context to check compatibility of
1678 //subexpression against target type; if we are in a method check context,
1679 //depending on whether boxing is allowed, we could have incompatibilities
1680 @Override
1681 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1682 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleTypeInSwitchExpression(details)));
1683 }
1684 };
1685 }
1686
1687 private void handleSwitch(JCTree switchTree,
1688 JCExpression selector,
1689 List<JCCase> cases,
1690 BiConsumer<JCCase, Env<AttrContext>> attribCase) {
1691 Type seltype = attribExpr(selector, env);
1692
1693 Env<AttrContext> switchEnv =
1694 env.dup(switchTree, env.info.dup(env.info.scope.dup()));
1695
1696 try {
1697 boolean enumSwitch = (seltype.tsym.flags() & Flags.ENUM) != 0;
1698 boolean stringSwitch = types.isSameType(seltype, syms.stringType);
1699 boolean booleanSwitch = types.isSameType(types.unboxedTypeOrType(seltype), syms.booleanType);
1700 boolean errorEnumSwitch = TreeInfo.isErrorEnumSwitch(selector, cases);
1701 boolean intSwitch = types.isAssignable(seltype, syms.intType);
1702 boolean patternSwitch;
1703 if (seltype.isPrimitive() && !intSwitch) {
1704 preview.checkSourceLevel(selector.pos(), Feature.PRIMITIVE_PATTERNS);
1705 patternSwitch = true;
1706 }
1707 if (!enumSwitch && !stringSwitch && !errorEnumSwitch &&
1708 !intSwitch) {
1709 preview.checkSourceLevel(selector.pos(), Feature.PATTERN_SWITCH);
1710 patternSwitch = true;
1711 } else {
1712 patternSwitch = cases.stream()
1713 .flatMap(c -> c.labels.stream())
1714 .anyMatch(l -> l.hasTag(PATTERNCASELABEL) ||
1715 TreeInfo.isNullCaseLabel(l));
1716 }
1717
1718 // Attribute all cases and
1719 // check that there are no duplicate case labels or default clauses.
1720 Set<Object> constants = new HashSet<>(); // The set of case constants.
1721 boolean hasDefault = false; // Is there a default label?
1722 boolean hasUnconditionalPattern = false; // Is there a unconditional pattern?
1723 boolean lastPatternErroneous = false; // Has the last pattern erroneous type?
1724 boolean hasNullPattern = false; // Is there a null pattern?
1725 CaseTree.CaseKind caseKind = null;
1726 boolean wasError = false;
1727 JCCaseLabel unconditionalCaseLabel = null;
1728 for (List<JCCase> l = cases; l.nonEmpty(); l = l.tail) {
1729 JCCase c = l.head;
1730 if (caseKind == null) {
1731 caseKind = c.caseKind;
1732 } else if (caseKind != c.caseKind && !wasError) {
1733 log.error(c.pos(),
1734 Errors.SwitchMixingCaseTypes);
1735 wasError = true;
1736 }
1737 MatchBindings currentBindings = null;
1738 MatchBindings guardBindings = null;
1739 for (List<JCCaseLabel> labels = c.labels; labels.nonEmpty(); labels = labels.tail) {
1740 JCCaseLabel label = labels.head;
1741 if (label instanceof JCConstantCaseLabel constLabel) {
1742 JCExpression expr = constLabel.expr;
1743 if (TreeInfo.isNull(expr)) {
1744 preview.checkSourceLevel(expr.pos(), Feature.CASE_NULL);
1745 if (hasNullPattern) {
1746 log.error(label.pos(), Errors.DuplicateCaseLabel);
1747 }
1748 hasNullPattern = true;
1749 attribExpr(expr, switchEnv, seltype);
1750 matchBindings = new MatchBindings(matchBindings.bindingsWhenTrue, matchBindings.bindingsWhenFalse, true);
1751 } else if (enumSwitch) {
1752 Symbol sym = enumConstant(expr, seltype);
1753 if (sym == null) {
1754 if (allowPatternSwitch) {
1755 attribTree(expr, switchEnv, caseLabelResultInfo(seltype));
1756 Symbol enumSym = TreeInfo.symbol(expr);
1757 if (enumSym == null || !enumSym.isEnum() || enumSym.kind != VAR) {
1758 log.error(expr.pos(), Errors.EnumLabelMustBeEnumConstant);
1759 } else if (!constants.add(enumSym)) {
1760 log.error(label.pos(), Errors.DuplicateCaseLabel);
1761 }
1762 } else {
1763 log.error(expr.pos(), Errors.EnumLabelMustBeUnqualifiedEnum);
1764 }
1765 } else if (!constants.add(sym)) {
1766 log.error(label.pos(), Errors.DuplicateCaseLabel);
1767 }
1768 } else if (errorEnumSwitch) {
1769 //error recovery: the selector is erroneous, and all the case labels
1770 //are identifiers. This could be an enum switch - don't report resolve
1771 //error for the case label:
1772 var prevResolveHelper = rs.basicLogResolveHelper;
1773 try {
1774 rs.basicLogResolveHelper = rs.silentLogResolveHelper;
1775 attribExpr(expr, switchEnv, seltype);
1776 } finally {
1777 rs.basicLogResolveHelper = prevResolveHelper;
1778 }
1779 } else {
1780 Type pattype = attribTree(expr, switchEnv, caseLabelResultInfo(seltype));
1781 if (!pattype.hasTag(ERROR)) {
1782 if (pattype.constValue() == null) {
1783 Symbol s = TreeInfo.symbol(expr);
1784 if (s != null && s.kind == TYP) {
1785 log.error(expr.pos(),
1786 Errors.PatternExpected);
1787 } else if (s == null || !s.isEnum()) {
1788 log.error(expr.pos(),
1789 (stringSwitch ? Errors.StringConstReq
1790 : intSwitch ? Errors.ConstExprReq
1791 : Errors.PatternOrEnumReq));
1792 } else if (!constants.add(s)) {
1793 log.error(label.pos(), Errors.DuplicateCaseLabel);
1794 }
1795 }
1796 else {
1797 if (!stringSwitch && !intSwitch &&
1798 !((pattype.getTag().isInSuperClassesOf(LONG) || pattype.getTag().equals(BOOLEAN)) &&
1799 types.isSameType(types.unboxedTypeOrType(seltype), pattype))) {
1800 log.error(label.pos(), Errors.ConstantLabelNotCompatible(pattype, seltype));
1801 } else if (!constants.add(pattype.constValue())) {
1802 log.error(c.pos(), Errors.DuplicateCaseLabel);
1803 }
1804 }
1805 }
1806 }
1807 } else if (label instanceof JCDefaultCaseLabel def) {
1808 if (hasDefault) {
1809 log.error(label.pos(), Errors.DuplicateDefaultLabel);
1810 } else if (hasUnconditionalPattern) {
1811 log.error(label.pos(), Errors.UnconditionalPatternAndDefault);
1812 } else if (booleanSwitch && constants.containsAll(Set.of(0, 1))) {
1813 log.error(label.pos(), Errors.DefaultAndBothBooleanValues);
1814 }
1815 hasDefault = true;
1816 matchBindings = MatchBindingsComputer.EMPTY;
1817 } else if (label instanceof JCPatternCaseLabel patternlabel) {
1818 //pattern
1819 JCPattern pat = patternlabel.pat;
1820 attribExpr(pat, switchEnv, seltype);
1821 Type primaryType = TreeInfo.primaryPatternType(pat);
1822
1823 if (primaryType.isPrimitive()) {
1824 preview.checkSourceLevel(pat.pos(), Feature.PRIMITIVE_PATTERNS);
1825 } else if (!primaryType.hasTag(TYPEVAR)) {
1826 primaryType = chk.checkClassOrArrayType(pat.pos(), primaryType);
1827 }
1828 checkCastablePattern(pat.pos(), seltype, primaryType);
1829 Type patternType = types.erasure(primaryType);
1830 JCExpression guard = c.guard;
1831 if (guardBindings == null && guard != null) {
1832 MatchBindings afterPattern = matchBindings;
1833 Env<AttrContext> bodyEnv = bindingEnv(switchEnv, matchBindings.bindingsWhenTrue);
1834 try {
1835 attribExpr(guard, bodyEnv, syms.booleanType);
1836 } finally {
1837 bodyEnv.info.scope.leave();
1838 }
1839
1840 guardBindings = matchBindings;
1841 matchBindings = afterPattern;
1842
1843 if (TreeInfo.isBooleanWithValue(guard, 0)) {
1844 log.error(guard.pos(), Errors.GuardHasConstantExpressionFalse);
1845 }
1846 }
1847 boolean unguarded = TreeInfo.unguardedCase(c) && !pat.hasTag(RECORDPATTERN);
1848 boolean unconditional =
1849 unguarded &&
1850 !patternType.isErroneous() &&
1851 types.isUnconditionallyExact(seltype, patternType);
1852 if (unconditional) {
1853 if (hasUnconditionalPattern) {
1854 log.error(pat.pos(), Errors.DuplicateUnconditionalPattern);
1855 } else if (hasDefault) {
1856 log.error(pat.pos(), Errors.UnconditionalPatternAndDefault);
1857 } else if (booleanSwitch && constants.containsAll(Set.of(0, 1))) {
1858 log.error(pat.pos(), Errors.UnconditionalPatternAndBothBooleanValues);
1859 }
1860 hasUnconditionalPattern = true;
1861 unconditionalCaseLabel = label;
1862 }
1863 lastPatternErroneous = patternType.isErroneous();
1864 } else {
1865 Assert.error();
1866 }
1867 currentBindings = matchBindingsComputer.switchCase(label, currentBindings, matchBindings);
1868 }
1869
1870 if (guardBindings != null) {
1871 currentBindings = matchBindingsComputer.caseGuard(c, currentBindings, guardBindings);
1872 }
1873
1874 Env<AttrContext> caseEnv =
1875 bindingEnv(switchEnv, c, currentBindings.bindingsWhenTrue);
1876 try {
1877 attribCase.accept(c, caseEnv);
1878 } finally {
1879 caseEnv.info.scope.leave();
1880 }
1881 addVars(c.stats, switchEnv.info.scope);
1882
1883 preFlow(c);
1884 c.completesNormally = flow.aliveAfter(caseEnv, c, make);
1885 }
1886 if (patternSwitch) {
1887 chk.checkSwitchCaseStructure(cases);
1888 chk.checkSwitchCaseLabelDominated(unconditionalCaseLabel, cases);
1889 }
1890 if (switchTree.hasTag(SWITCH)) {
1891 ((JCSwitch) switchTree).hasUnconditionalPattern =
1892 hasDefault || hasUnconditionalPattern || lastPatternErroneous;
1893 ((JCSwitch) switchTree).patternSwitch = patternSwitch;
1894 } else if (switchTree.hasTag(SWITCH_EXPRESSION)) {
1895 ((JCSwitchExpression) switchTree).hasUnconditionalPattern =
1896 hasDefault || hasUnconditionalPattern || lastPatternErroneous;
1897 ((JCSwitchExpression) switchTree).patternSwitch = patternSwitch;
1898 } else {
1899 Assert.error(switchTree.getTag().name());
1900 }
1901 } finally {
1902 switchEnv.info.scope.leave();
1903 }
1904 }
1905 // where
1906 private ResultInfo caseLabelResultInfo(Type seltype) {
1907 return new ResultInfo(KindSelector.VAL_TYP,
1908 !seltype.hasTag(ERROR) ? seltype
1909 : Type.noType);
1910 }
1911 /** Add any variables defined in stats to the switch scope. */
1912 private static void addVars(List<JCStatement> stats, WriteableScope switchScope) {
1913 for (;stats.nonEmpty(); stats = stats.tail) {
1914 JCTree stat = stats.head;
1915 if (stat.hasTag(VARDEF))
1916 switchScope.enter(((JCVariableDecl) stat).sym);
1917 }
1918 }
1919 // where
1920 /** Return the selected enumeration constant symbol, or null. */
1921 private Symbol enumConstant(JCTree tree, Type enumType) {
1922 if (tree.hasTag(IDENT)) {
1923 JCIdent ident = (JCIdent)tree;
1924 Name name = ident.name;
1925 for (Symbol sym : enumType.tsym.members().getSymbolsByName(name)) {
1926 if (sym.kind == VAR) {
1927 Symbol s = ident.sym = sym;
1928 ((VarSymbol)s).getConstValue(); // ensure initializer is evaluated
1929 ident.type = s.type;
1930 return ((s.flags_field & Flags.ENUM) == 0)
1931 ? null : s;
1932 }
1933 }
1934 }
1935 return null;
1936 }
1937
1938 public void visitSynchronized(JCSynchronized tree) {
1939 chk.checkRefType(tree.pos(), attribExpr(tree.lock, env));
1940 if (env.info.lint.isEnabled(LintCategory.SYNCHRONIZATION) && isValueBased(tree.lock.type)) {
1941 log.warning(LintCategory.SYNCHRONIZATION, tree.pos(), Warnings.AttemptToSynchronizeOnInstanceOfValueBasedClass);
1942 }
1943 attribStat(tree.body, env);
1944 result = null;
1945 }
1946 // where
1947 private boolean isValueBased(Type t) {
1948 return t != null && t.tsym != null && (t.tsym.flags() & VALUE_BASED) != 0;
1949 }
1950
1951
1952 public void visitTry(JCTry tree) {
1953 // Create a new local environment with a local
1954 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
1955 try {
1956 boolean isTryWithResource = tree.resources.nonEmpty();
1957 // Create a nested environment for attributing the try block if needed
1958 Env<AttrContext> tryEnv = isTryWithResource ?
1959 env.dup(tree, localEnv.info.dup(localEnv.info.scope.dup())) :
1960 localEnv;
1961 try {
1962 // Attribute resource declarations
1963 for (JCTree resource : tree.resources) {
1964 CheckContext twrContext = new Check.NestedCheckContext(resultInfo.checkContext) {
1965 @Override
1966 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1967 chk.basicHandler.report(pos, diags.fragment(Fragments.TryNotApplicableToType(details)));
1968 }
1969 };
1970 ResultInfo twrResult =
1971 new ResultInfo(KindSelector.VAR,
1972 syms.autoCloseableType,
1973 twrContext);
1974 if (resource.hasTag(VARDEF)) {
1975 attribStat(resource, tryEnv);
1976 twrResult.check(resource, resource.type);
1977
1978 //check that resource type cannot throw InterruptedException
1979 checkAutoCloseable(resource.pos(), localEnv, resource.type);
1980
1981 VarSymbol var = ((JCVariableDecl) resource).sym;
1982
1983 var.flags_field |= Flags.FINAL;
1984 var.setData(ElementKind.RESOURCE_VARIABLE);
1985 } else {
1986 attribTree(resource, tryEnv, twrResult);
1987 }
1988 }
1989 // Attribute body
1990 attribStat(tree.body, tryEnv);
1991 } finally {
1992 if (isTryWithResource)
1993 tryEnv.info.scope.leave();
1994 }
1995
1996 // Attribute catch clauses
1997 for (List<JCCatch> l = tree.catchers; l.nonEmpty(); l = l.tail) {
1998 JCCatch c = l.head;
1999 Env<AttrContext> catchEnv =
2000 localEnv.dup(c, localEnv.info.dup(localEnv.info.scope.dup()));
2001 try {
2002 Type ctype = attribStat(c.param, catchEnv);
2003 if (TreeInfo.isMultiCatch(c)) {
2004 //multi-catch parameter is implicitly marked as final
2005 c.param.sym.flags_field |= FINAL | UNION;
2006 }
2007 if (c.param.sym.kind == VAR) {
2008 c.param.sym.setData(ElementKind.EXCEPTION_PARAMETER);
2009 }
2010 chk.checkType(c.param.vartype.pos(),
2011 chk.checkClassType(c.param.vartype.pos(), ctype),
2012 syms.throwableType);
2013 attribStat(c.body, catchEnv);
2014 } finally {
2015 catchEnv.info.scope.leave();
2016 }
2017 }
2018
2019 // Attribute finalizer
2020 if (tree.finalizer != null) attribStat(tree.finalizer, localEnv);
2021 result = null;
2022 }
2023 finally {
2024 localEnv.info.scope.leave();
2025 }
2026 }
2027
2028 void checkAutoCloseable(DiagnosticPosition pos, Env<AttrContext> env, Type resource) {
2029 if (!resource.isErroneous() &&
2030 types.asSuper(resource, syms.autoCloseableType.tsym) != null &&
2031 !types.isSameType(resource, syms.autoCloseableType)) { // Don't emit warning for AutoCloseable itself
2032 Symbol close = syms.noSymbol;
2033 Log.DiagnosticHandler discardHandler = new Log.DiscardDiagnosticHandler(log);
2034 try {
2035 close = rs.resolveQualifiedMethod(pos,
2036 env,
2037 types.skipTypeVars(resource, false),
2038 names.close,
2039 List.nil(),
2040 List.nil());
2041 }
2042 finally {
2043 log.popDiagnosticHandler(discardHandler);
2044 }
2045 if (close.kind == MTH &&
2046 close.overrides(syms.autoCloseableClose, resource.tsym, types, true) &&
2047 chk.isHandled(syms.interruptedExceptionType, types.memberType(resource, close).getThrownTypes()) &&
2048 env.info.lint.isEnabled(LintCategory.TRY)) {
2049 log.warning(LintCategory.TRY, pos, Warnings.TryResourceThrowsInterruptedExc(resource));
2050 }
2051 }
2052 }
2053
2054 public void visitConditional(JCConditional tree) {
2055 Type condtype = attribExpr(tree.cond, env, syms.booleanType);
2056 MatchBindings condBindings = matchBindings;
2057
2058 tree.polyKind = (pt().hasTag(NONE) && pt() != Type.recoveryType && pt() != Infer.anyPoly ||
2059 isBooleanOrNumeric(env, tree)) ?
2060 PolyKind.STANDALONE : PolyKind.POLY;
2061
2062 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) {
2063 //this means we are returning a poly conditional from void-compatible lambda expression
2064 resultInfo.checkContext.report(tree, diags.fragment(Fragments.ConditionalTargetCantBeVoid));
2065 result = tree.type = types.createErrorType(resultInfo.pt);
2066 return;
2067 }
2068
2069 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ?
2070 unknownExprInfo :
2071 resultInfo.dup(conditionalContext(resultInfo.checkContext));
2072
2073
2074 // x ? y : z
2075 // include x's bindings when true in y
2076 // include x's bindings when false in z
2077
2078 Type truetype;
2079 Env<AttrContext> trueEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
2080 try {
2081 truetype = attribTree(tree.truepart, trueEnv, condInfo);
2082 } finally {
2083 trueEnv.info.scope.leave();
2084 }
2085
2086 MatchBindings trueBindings = matchBindings;
2087
2088 Type falsetype;
2089 Env<AttrContext> falseEnv = bindingEnv(env, condBindings.bindingsWhenFalse);
2090 try {
2091 falsetype = attribTree(tree.falsepart, falseEnv, condInfo);
2092 } finally {
2093 falseEnv.info.scope.leave();
2094 }
2095
2096 MatchBindings falseBindings = matchBindings;
2097
2098 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ?
2099 condType(List.of(tree.truepart.pos(), tree.falsepart.pos()),
2100 List.of(truetype, falsetype)) : pt();
2101 if (condtype.constValue() != null &&
2102 truetype.constValue() != null &&
2103 falsetype.constValue() != null &&
2104 !owntype.hasTag(NONE)) {
2105 //constant folding
2106 owntype = cfolder.coerce(condtype.isTrue() ? truetype : falsetype, owntype);
2107 }
2108 result = check(tree, owntype, KindSelector.VAL, resultInfo);
2109 matchBindings = matchBindingsComputer.conditional(tree, condBindings, trueBindings, falseBindings);
2110 }
2111 //where
2112 private boolean isBooleanOrNumeric(Env<AttrContext> env, JCExpression tree) {
2113 switch (tree.getTag()) {
2114 case LITERAL: return ((JCLiteral)tree).typetag.isSubRangeOf(DOUBLE) ||
2115 ((JCLiteral)tree).typetag == BOOLEAN ||
2116 ((JCLiteral)tree).typetag == BOT;
2117 case LAMBDA: case REFERENCE: return false;
2118 case PARENS: return isBooleanOrNumeric(env, ((JCParens)tree).expr);
2119 case CONDEXPR:
2120 JCConditional condTree = (JCConditional)tree;
2121 return isBooleanOrNumeric(env, condTree.truepart) &&
2122 isBooleanOrNumeric(env, condTree.falsepart);
2123 case APPLY:
2124 JCMethodInvocation speculativeMethodTree =
2125 (JCMethodInvocation)deferredAttr.attribSpeculative(
2126 tree, env, unknownExprInfo,
2127 argumentAttr.withLocalCacheContext());
2128 Symbol msym = TreeInfo.symbol(speculativeMethodTree.meth);
2129 Type receiverType = speculativeMethodTree.meth.hasTag(IDENT) ?
2130 env.enclClass.type :
2131 ((JCFieldAccess)speculativeMethodTree.meth).selected.type;
2132 Type owntype = types.memberType(receiverType, msym).getReturnType();
2133 return primitiveOrBoxed(owntype);
2134 case NEWCLASS:
2135 JCExpression className =
2136 removeClassParams.translate(((JCNewClass)tree).clazz);
2137 JCExpression speculativeNewClassTree =
2138 (JCExpression)deferredAttr.attribSpeculative(
2139 className, env, unknownTypeInfo,
2140 argumentAttr.withLocalCacheContext());
2141 return primitiveOrBoxed(speculativeNewClassTree.type);
2142 default:
2143 Type speculativeType = deferredAttr.attribSpeculative(tree, env, unknownExprInfo,
2144 argumentAttr.withLocalCacheContext()).type;
2145 return primitiveOrBoxed(speculativeType);
2146 }
2147 }
2148 //where
2149 boolean primitiveOrBoxed(Type t) {
2150 return (!t.hasTag(TYPEVAR) && !t.isErroneous() && types.unboxedTypeOrType(t).isPrimitive());
2151 }
2152
2153 TreeTranslator removeClassParams = new TreeTranslator() {
2154 @Override
2155 public void visitTypeApply(JCTypeApply tree) {
2156 result = translate(tree.clazz);
2157 }
2158 };
2159
2160 CheckContext conditionalContext(CheckContext checkContext) {
2161 return new Check.NestedCheckContext(checkContext) {
2162 //this will use enclosing check context to check compatibility of
2163 //subexpression against target type; if we are in a method check context,
2164 //depending on whether boxing is allowed, we could have incompatibilities
2165 @Override
2166 public void report(DiagnosticPosition pos, JCDiagnostic details) {
2167 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleTypeInConditional(details)));
2168 }
2169 };
2170 }
2171
2172 /** Compute the type of a conditional expression, after
2173 * checking that it exists. See JLS 15.25. Does not take into
2174 * account the special case where condition and both arms
2175 * are constants.
2176 *
2177 * @param pos The source position to be used for error
2178 * diagnostics.
2179 * @param thentype The type of the expression's then-part.
2180 * @param elsetype The type of the expression's else-part.
2181 */
2182 Type condType(List<DiagnosticPosition> positions, List<Type> condTypes) {
2183 if (condTypes.isEmpty()) {
2184 return syms.objectType; //TODO: how to handle?
2185 }
2186 Type first = condTypes.head;
2187 // If same type, that is the result
2188 if (condTypes.tail.stream().allMatch(t -> types.isSameType(first, t)))
2189 return first.baseType();
2190
2191 List<Type> unboxedTypes = condTypes.stream()
2192 .map(t -> t.isPrimitive() ? t : types.unboxedType(t))
2193 .collect(List.collector());
2194
2195 // Otherwise, if both arms can be converted to a numeric
2196 // type, return the least numeric type that fits both arms
2197 // (i.e. return larger of the two, or return int if one
2198 // arm is short, the other is char).
2199 if (unboxedTypes.stream().allMatch(t -> t.isPrimitive())) {
2200 // If one arm has an integer subrange type (i.e., byte,
2201 // short, or char), and the other is an integer constant
2202 // that fits into the subrange, return the subrange type.
2203 for (Type type : unboxedTypes) {
2204 if (!type.getTag().isStrictSubRangeOf(INT)) {
2205 continue;
2206 }
2207 if (unboxedTypes.stream().filter(t -> t != type).allMatch(t -> t.hasTag(INT) && types.isAssignable(t, type)))
2208 return type.baseType();
2209 }
2210
2211 for (TypeTag tag : primitiveTags) {
2212 Type candidate = syms.typeOfTag[tag.ordinal()];
2213 if (unboxedTypes.stream().allMatch(t -> types.isSubtype(t, candidate))) {
2214 return candidate;
2215 }
2216 }
2217 }
2218
2219 // Those were all the cases that could result in a primitive
2220 condTypes = condTypes.stream()
2221 .map(t -> t.isPrimitive() ? types.boxedClass(t).type : t)
2222 .collect(List.collector());
2223
2224 for (Type type : condTypes) {
2225 if (condTypes.stream().filter(t -> t != type).allMatch(t -> types.isAssignable(t, type)))
2226 return type.baseType();
2227 }
2228
2229 Iterator<DiagnosticPosition> posIt = positions.iterator();
2230
2231 condTypes = condTypes.stream()
2232 .map(t -> chk.checkNonVoid(posIt.next(), t))
2233 .collect(List.collector());
2234
2235 // both are known to be reference types. The result is
2236 // lub(thentype,elsetype). This cannot fail, as it will
2237 // always be possible to infer "Object" if nothing better.
2238 return types.lub(condTypes.stream()
2239 .map(t -> t.baseType())
2240 .filter(t -> !t.hasTag(BOT))
2241 .collect(List.collector()));
2242 }
2243
2244 static final TypeTag[] primitiveTags = new TypeTag[]{
2245 BYTE,
2246 CHAR,
2247 SHORT,
2248 INT,
2249 LONG,
2250 FLOAT,
2251 DOUBLE,
2252 BOOLEAN,
2253 };
2254
2255 Env<AttrContext> bindingEnv(Env<AttrContext> env, List<BindingSymbol> bindings) {
2256 return bindingEnv(env, env.tree, bindings);
2257 }
2258
2259 Env<AttrContext> bindingEnv(Env<AttrContext> env, JCTree newTree, List<BindingSymbol> bindings) {
2260 Env<AttrContext> env1 = env.dup(newTree, env.info.dup(env.info.scope.dup()));
2261 bindings.forEach(env1.info.scope::enter);
2262 return env1;
2263 }
2264
2265 public void visitIf(JCIf tree) {
2266 attribExpr(tree.cond, env, syms.booleanType);
2267
2268 // if (x) { y } [ else z ]
2269 // include x's bindings when true in y
2270 // include x's bindings when false in z
2271
2272 MatchBindings condBindings = matchBindings;
2273 Env<AttrContext> thenEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
2274
2275 try {
2276 attribStat(tree.thenpart, thenEnv);
2277 } finally {
2278 thenEnv.info.scope.leave();
2279 }
2280
2281 preFlow(tree.thenpart);
2282 boolean aliveAfterThen = flow.aliveAfter(env, tree.thenpart, make);
2283 boolean aliveAfterElse;
2284
2285 if (tree.elsepart != null) {
2286 Env<AttrContext> elseEnv = bindingEnv(env, condBindings.bindingsWhenFalse);
2287 try {
2288 attribStat(tree.elsepart, elseEnv);
2289 } finally {
2290 elseEnv.info.scope.leave();
2291 }
2292 preFlow(tree.elsepart);
2293 aliveAfterElse = flow.aliveAfter(env, tree.elsepart, make);
2294 } else {
2295 aliveAfterElse = true;
2296 }
2297
2298 chk.checkEmptyIf(tree);
2299
2300 List<BindingSymbol> afterIfBindings = List.nil();
2301
2302 if (aliveAfterThen && !aliveAfterElse) {
2303 afterIfBindings = condBindings.bindingsWhenTrue;
2304 } else if (aliveAfterElse && !aliveAfterThen) {
2305 afterIfBindings = condBindings.bindingsWhenFalse;
2306 }
2307
2308 addBindings2Scope(tree, afterIfBindings);
2309
2310 result = null;
2311 }
2312
2313 void preFlow(JCTree tree) {
2314 attrRecover.doRecovery();
2315 new PostAttrAnalyzer() {
2316 @Override
2317 public void scan(JCTree tree) {
2318 if (tree == null ||
2319 (tree.type != null &&
2320 tree.type == Type.stuckType)) {
2321 //don't touch stuck expressions!
2322 return;
2323 }
2324 super.scan(tree);
2325 }
2326
2327 @Override
2328 public void visitClassDef(JCClassDecl that) {
2329 if (that.sym != null) {
2330 // Method preFlow shouldn't visit class definitions
2331 // that have not been entered and attributed.
2332 // See JDK-8254557 and JDK-8203277 for more details.
2333 super.visitClassDef(that);
2334 }
2335 }
2336
2337 @Override
2338 public void visitLambda(JCLambda that) {
2339 if (that.type != null) {
2340 // Method preFlow shouldn't visit lambda expressions
2341 // that have not been entered and attributed.
2342 // See JDK-8254557 and JDK-8203277 for more details.
2343 super.visitLambda(that);
2344 }
2345 }
2346 }.scan(tree);
2347 }
2348
2349 public void visitExec(JCExpressionStatement tree) {
2350 //a fresh environment is required for 292 inference to work properly ---
2351 //see Infer.instantiatePolymorphicSignatureInstance()
2352 Env<AttrContext> localEnv = env.dup(tree);
2353 attribExpr(tree.expr, localEnv);
2354 result = null;
2355 }
2356
2357 public void visitBreak(JCBreak tree) {
2358 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
2359 result = null;
2360 }
2361
2362 public void visitYield(JCYield tree) {
2363 if (env.info.yieldResult != null) {
2364 attribTree(tree.value, env, env.info.yieldResult);
2365 tree.target = findJumpTarget(tree.pos(), tree.getTag(), names.empty, env);
2366 } else {
2367 log.error(tree.pos(), tree.value.hasTag(PARENS)
2368 ? Errors.NoSwitchExpressionQualify
2369 : Errors.NoSwitchExpression);
2370 attribTree(tree.value, env, unknownExprInfo);
2371 }
2372 result = null;
2373 }
2374
2375 public void visitContinue(JCContinue tree) {
2376 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
2377 result = null;
2378 }
2379 //where
2380 /** Return the target of a break, continue or yield statement,
2381 * if it exists, report an error if not.
2382 * Note: The target of a labelled break or continue is the
2383 * (non-labelled) statement tree referred to by the label,
2384 * not the tree representing the labelled statement itself.
2385 *
2386 * @param pos The position to be used for error diagnostics
2387 * @param tag The tag of the jump statement. This is either
2388 * Tree.BREAK or Tree.CONTINUE.
2389 * @param label The label of the jump statement, or null if no
2390 * label is given.
2391 * @param env The environment current at the jump statement.
2392 */
2393 private JCTree findJumpTarget(DiagnosticPosition pos,
2394 JCTree.Tag tag,
2395 Name label,
2396 Env<AttrContext> env) {
2397 Pair<JCTree, Error> jumpTarget = findJumpTargetNoError(tag, label, env);
2398
2399 if (jumpTarget.snd != null) {
2400 log.error(pos, jumpTarget.snd);
2401 }
2402
2403 return jumpTarget.fst;
2404 }
2405 /** Return the target of a break or continue statement, if it exists,
2406 * report an error if not.
2407 * Note: The target of a labelled break or continue is the
2408 * (non-labelled) statement tree referred to by the label,
2409 * not the tree representing the labelled statement itself.
2410 *
2411 * @param tag The tag of the jump statement. This is either
2412 * Tree.BREAK or Tree.CONTINUE.
2413 * @param label The label of the jump statement, or null if no
2414 * label is given.
2415 * @param env The environment current at the jump statement.
2416 */
2417 private Pair<JCTree, JCDiagnostic.Error> findJumpTargetNoError(JCTree.Tag tag,
2418 Name label,
2419 Env<AttrContext> env) {
2420 // Search environments outwards from the point of jump.
2421 Env<AttrContext> env1 = env;
2422 JCDiagnostic.Error pendingError = null;
2423 LOOP:
2424 while (env1 != null) {
2425 switch (env1.tree.getTag()) {
2426 case LABELLED:
2427 JCLabeledStatement labelled = (JCLabeledStatement)env1.tree;
2428 if (label == labelled.label) {
2429 // If jump is a continue, check that target is a loop.
2430 if (tag == CONTINUE) {
2431 if (!labelled.body.hasTag(DOLOOP) &&
2432 !labelled.body.hasTag(WHILELOOP) &&
2433 !labelled.body.hasTag(FORLOOP) &&
2434 !labelled.body.hasTag(FOREACHLOOP)) {
2435 pendingError = Errors.NotLoopLabel(label);
2436 }
2437 // Found labelled statement target, now go inwards
2438 // to next non-labelled tree.
2439 return Pair.of(TreeInfo.referencedStatement(labelled), pendingError);
2440 } else {
2441 return Pair.of(labelled, pendingError);
2442 }
2443 }
2444 break;
2445 case DOLOOP:
2446 case WHILELOOP:
2447 case FORLOOP:
2448 case FOREACHLOOP:
2449 if (label == null) return Pair.of(env1.tree, pendingError);
2450 break;
2451 case SWITCH:
2452 if (label == null && tag == BREAK) return Pair.of(env1.tree, null);
2453 break;
2454 case SWITCH_EXPRESSION:
2455 if (tag == YIELD) {
2456 return Pair.of(env1.tree, null);
2457 } else if (tag == BREAK) {
2458 pendingError = Errors.BreakOutsideSwitchExpression;
2459 } else {
2460 pendingError = Errors.ContinueOutsideSwitchExpression;
2461 }
2462 break;
2463 case LAMBDA:
2464 case METHODDEF:
2465 case CLASSDEF:
2466 break LOOP;
2467 default:
2468 }
2469 env1 = env1.next;
2470 }
2471 if (label != null)
2472 return Pair.of(null, Errors.UndefLabel(label));
2473 else if (pendingError != null)
2474 return Pair.of(null, pendingError);
2475 else if (tag == CONTINUE)
2476 return Pair.of(null, Errors.ContOutsideLoop);
2477 else
2478 return Pair.of(null, Errors.BreakOutsideSwitchLoop);
2479 }
2480
2481 public void visitReturn(JCReturn tree) {
2482 // Check that there is an enclosing method which is
2483 // nested within than the enclosing class.
2484 if (env.info.returnResult == null) {
2485 log.error(tree.pos(), Errors.RetOutsideMeth);
2486 } else if (env.info.yieldResult != null) {
2487 log.error(tree.pos(), Errors.ReturnOutsideSwitchExpression);
2488 if (tree.expr != null) {
2489 attribExpr(tree.expr, env, env.info.yieldResult.pt);
2490 }
2491 } else if (!env.info.isLambda &&
2492 !env.info.isNewClass &&
2493 env.enclMethod != null &&
2494 TreeInfo.isCompactConstructor(env.enclMethod)) {
2495 log.error(env.enclMethod,
2496 Errors.InvalidCanonicalConstructorInRecord(Fragments.Compact, env.enclMethod.sym.name, Fragments.CanonicalCantHaveReturnStatement));
2497 } else {
2498 // Attribute return expression, if it exists, and check that
2499 // it conforms to result type of enclosing method.
2500 if (tree.expr != null) {
2501 if (env.info.returnResult.pt.hasTag(VOID)) {
2502 env.info.returnResult.checkContext.report(tree.expr.pos(),
2503 diags.fragment(Fragments.UnexpectedRetVal));
2504 }
2505 attribTree(tree.expr, env, env.info.returnResult);
2506 } else if (!env.info.returnResult.pt.hasTag(VOID) &&
2507 !env.info.returnResult.pt.hasTag(NONE)) {
2508 env.info.returnResult.checkContext.report(tree.pos(),
2509 diags.fragment(Fragments.MissingRetVal(env.info.returnResult.pt)));
2510 }
2511 }
2512 result = null;
2513 }
2514
2515 public void visitThrow(JCThrow tree) {
2516 Type owntype = attribExpr(tree.expr, env, Type.noType);
2517 chk.checkType(tree, owntype, syms.throwableType);
2518 result = null;
2519 }
2520
2521 public void visitAssert(JCAssert tree) {
2522 attribExpr(tree.cond, env, syms.booleanType);
2523 if (tree.detail != null) {
2524 chk.checkNonVoid(tree.detail.pos(), attribExpr(tree.detail, env));
2525 }
2526 result = null;
2527 }
2528
2529 /** Visitor method for method invocations.
2530 * NOTE: The method part of an application will have in its type field
2531 * the return type of the method, not the method's type itself!
2532 */
2533 public void visitApply(JCMethodInvocation tree) {
2534 // The local environment of a method application is
2535 // a new environment nested in the current one.
2536 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
2537
2538 // The types of the actual method arguments.
2539 List<Type> argtypes;
2540
2541 // The types of the actual method type arguments.
2542 List<Type> typeargtypes = null;
2543
2544 Name methName = TreeInfo.name(tree.meth);
2545
2546 boolean isConstructorCall =
2547 methName == names._this || methName == names._super;
2548
2549 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
2550 if (isConstructorCall) {
2551
2552 // Attribute arguments, yielding list of argument types.
2553 KindSelector kind = attribArgs(KindSelector.MTH, tree.args, localEnv, argtypesBuf);
2554 argtypes = argtypesBuf.toList();
2555 typeargtypes = attribTypes(tree.typeargs, localEnv);
2556
2557 // Done with this()/super() parameters. End of constructor prologue.
2558 env.info.ctorPrologue = false;
2559
2560 // Variable `site' points to the class in which the called
2561 // constructor is defined.
2562 Type site = env.enclClass.sym.type;
2563 if (methName == names._super) {
2564 if (site == syms.objectType) {
2565 log.error(tree.meth.pos(), Errors.NoSuperclass(site));
2566 site = types.createErrorType(syms.objectType);
2567 } else {
2568 site = types.supertype(site);
2569 }
2570 }
2571
2572 if (site.hasTag(CLASS)) {
2573 Type encl = site.getEnclosingType();
2574 while (encl != null && encl.hasTag(TYPEVAR))
2575 encl = encl.getUpperBound();
2576 if (encl.hasTag(CLASS)) {
2577 // we are calling a nested class
2578
2579 if (tree.meth.hasTag(SELECT)) {
2580 JCTree qualifier = ((JCFieldAccess) tree.meth).selected;
2581
2582 // We are seeing a prefixed call, of the form
2583 // <expr>.super(...).
2584 // Check that the prefix expression conforms
2585 // to the outer instance type of the class.
2586 chk.checkRefType(qualifier.pos(),
2587 attribExpr(qualifier, localEnv,
2588 encl));
2589 } else if (methName == names._super) {
2590 // qualifier omitted; check for existence
2591 // of an appropriate implicit qualifier.
2592 rs.resolveImplicitThis(tree.meth.pos(),
2593 localEnv, site, true);
2594 }
2595 } else if (tree.meth.hasTag(SELECT)) {
2596 log.error(tree.meth.pos(),
2597 Errors.IllegalQualNotIcls(site.tsym));
2598 attribExpr(((JCFieldAccess) tree.meth).selected, localEnv, site);
2599 }
2600
2601 // if we're calling a java.lang.Enum constructor,
2602 // prefix the implicit String and int parameters
2603 if (site.tsym == syms.enumSym)
2604 argtypes = argtypes.prepend(syms.intType).prepend(syms.stringType);
2605
2606 // Resolve the called constructor under the assumption
2607 // that we are referring to a superclass instance of the
2608 // current instance (JLS ???).
2609 boolean selectSuperPrev = localEnv.info.selectSuper;
2610 localEnv.info.selectSuper = true;
2611 localEnv.info.pendingResolutionPhase = null;
2612 Symbol sym = rs.resolveConstructor(
2613 tree.meth.pos(), localEnv, site, argtypes, typeargtypes);
2614 localEnv.info.selectSuper = selectSuperPrev;
2615
2616 // Set method symbol to resolved constructor...
2617 TreeInfo.setSymbol(tree.meth, sym);
2618
2619 // ...and check that it is legal in the current context.
2620 // (this will also set the tree's type)
2621 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
2622 checkId(tree.meth, site, sym, localEnv,
2623 new ResultInfo(kind, mpt));
2624 } else if (site.hasTag(ERROR) && tree.meth.hasTag(SELECT)) {
2625 attribExpr(((JCFieldAccess) tree.meth).selected, localEnv, site);
2626 }
2627 // Otherwise, `site' is an error type and we do nothing
2628 result = tree.type = syms.voidType;
2629 } else {
2630 // Otherwise, we are seeing a regular method call.
2631 // Attribute the arguments, yielding list of argument types, ...
2632 KindSelector kind = attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf);
2633 argtypes = argtypesBuf.toList();
2634 typeargtypes = attribAnyTypes(tree.typeargs, localEnv);
2635
2636 // ... and attribute the method using as a prototype a methodtype
2637 // whose formal argument types is exactly the list of actual
2638 // arguments (this will also set the method symbol).
2639 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
2640 localEnv.info.pendingResolutionPhase = null;
2641 Type mtype = attribTree(tree.meth, localEnv, new ResultInfo(kind, mpt, resultInfo.checkContext));
2642
2643 // Compute the result type.
2644 Type restype = mtype.getReturnType();
2645 if (restype.hasTag(WILDCARD))
2646 throw new AssertionError(mtype);
2647
2648 Type qualifier = (tree.meth.hasTag(SELECT))
2649 ? ((JCFieldAccess) tree.meth).selected.type
2650 : env.enclClass.sym.type;
2651 Symbol msym = TreeInfo.symbol(tree.meth);
2652 restype = adjustMethodReturnType(msym, qualifier, methName, argtypes, restype);
2653
2654 chk.checkRefTypes(tree.typeargs, typeargtypes);
2655
2656 // Check that value of resulting type is admissible in the
2657 // current context. Also, capture the return type
2658 Type capturedRes = resultInfo.checkContext.inferenceContext().cachedCapture(tree, restype, true);
2659 result = check(tree, capturedRes, KindSelector.VAL, resultInfo);
2660 }
2661 chk.validate(tree.typeargs, localEnv);
2662 }
2663 //where
2664 Type adjustMethodReturnType(Symbol msym, Type qualifierType, Name methodName, List<Type> argtypes, Type restype) {
2665 if (msym != null &&
2666 (msym.owner == syms.objectType.tsym || msym.owner.isInterface()) &&
2667 methodName == names.getClass &&
2668 argtypes.isEmpty()) {
2669 // as a special case, x.getClass() has type Class<? extends |X|>
2670 return new ClassType(restype.getEnclosingType(),
2671 List.of(new WildcardType(types.erasure(qualifierType.baseType()),
2672 BoundKind.EXTENDS,
2673 syms.boundClass)),
2674 restype.tsym,
2675 restype.getMetadata());
2676 } else if (msym != null &&
2677 msym.owner == syms.arrayClass &&
2678 methodName == names.clone &&
2679 types.isArray(qualifierType)) {
2680 // as a special case, array.clone() has a result that is
2681 // the same as static type of the array being cloned
2682 return qualifierType;
2683 } else {
2684 return restype;
2685 }
2686 }
2687
2688 /** Obtain a method type with given argument types.
2689 */
2690 Type newMethodTemplate(Type restype, List<Type> argtypes, List<Type> typeargtypes) {
2691 MethodType mt = new MethodType(argtypes, restype, List.nil(), syms.methodClass);
2692 return (typeargtypes == null) ? mt : (Type)new ForAll(typeargtypes, mt);
2693 }
2694
2695 public void visitNewClass(final JCNewClass tree) {
2696 Type owntype = types.createErrorType(tree.type);
2697
2698 // The local environment of a class creation is
2699 // a new environment nested in the current one.
2700 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
2701
2702 // The anonymous inner class definition of the new expression,
2703 // if one is defined by it.
2704 JCClassDecl cdef = tree.def;
2705
2706 // If enclosing class is given, attribute it, and
2707 // complete class name to be fully qualified
2708 JCExpression clazz = tree.clazz; // Class field following new
2709 JCExpression clazzid; // Identifier in class field
2710 JCAnnotatedType annoclazzid; // Annotated type enclosing clazzid
2711 annoclazzid = null;
2712
2713 if (clazz.hasTag(TYPEAPPLY)) {
2714 clazzid = ((JCTypeApply) clazz).clazz;
2715 if (clazzid.hasTag(ANNOTATED_TYPE)) {
2716 annoclazzid = (JCAnnotatedType) clazzid;
2717 clazzid = annoclazzid.underlyingType;
2718 }
2719 } else {
2720 if (clazz.hasTag(ANNOTATED_TYPE)) {
2721 annoclazzid = (JCAnnotatedType) clazz;
2722 clazzid = annoclazzid.underlyingType;
2723 } else {
2724 clazzid = clazz;
2725 }
2726 }
2727
2728 JCExpression clazzid1 = clazzid; // The same in fully qualified form
2729
2730 if (tree.encl != null) {
2731 // We are seeing a qualified new, of the form
2732 // <expr>.new C <...> (...) ...
2733 // In this case, we let clazz stand for the name of the
2734 // allocated class C prefixed with the type of the qualifier
2735 // expression, so that we can
2736 // resolve it with standard techniques later. I.e., if
2737 // <expr> has type T, then <expr>.new C <...> (...)
2738 // yields a clazz T.C.
2739 Type encltype = chk.checkRefType(tree.encl.pos(),
2740 attribExpr(tree.encl, env));
2741 // TODO 308: in <expr>.new C, do we also want to add the type annotations
2742 // from expr to the combined type, or not? Yes, do this.
2743 clazzid1 = make.at(clazz.pos).Select(make.Type(encltype),
2744 ((JCIdent) clazzid).name);
2745
2746 EndPosTable endPosTable = this.env.toplevel.endPositions;
2747 endPosTable.storeEnd(clazzid1, clazzid.getEndPosition(endPosTable));
2748 if (clazz.hasTag(ANNOTATED_TYPE)) {
2749 JCAnnotatedType annoType = (JCAnnotatedType) clazz;
2750 List<JCAnnotation> annos = annoType.annotations;
2751
2752 if (annoType.underlyingType.hasTag(TYPEAPPLY)) {
2753 clazzid1 = make.at(tree.pos).
2754 TypeApply(clazzid1,
2755 ((JCTypeApply) clazz).arguments);
2756 }
2757
2758 clazzid1 = make.at(tree.pos).
2759 AnnotatedType(annos, clazzid1);
2760 } else if (clazz.hasTag(TYPEAPPLY)) {
2761 clazzid1 = make.at(tree.pos).
2762 TypeApply(clazzid1,
2763 ((JCTypeApply) clazz).arguments);
2764 }
2765
2766 clazz = clazzid1;
2767 }
2768
2769 // Attribute clazz expression and store
2770 // symbol + type back into the attributed tree.
2771 Type clazztype;
2772
2773 try {
2774 env.info.isNewClass = true;
2775 clazztype = TreeInfo.isEnumInit(env.tree) ?
2776 attribIdentAsEnumType(env, (JCIdent)clazz) :
2777 attribType(clazz, env);
2778 } finally {
2779 env.info.isNewClass = false;
2780 }
2781
2782 clazztype = chk.checkDiamond(tree, clazztype);
2783 chk.validate(clazz, localEnv);
2784 if (tree.encl != null) {
2785 // We have to work in this case to store
2786 // symbol + type back into the attributed tree.
2787 tree.clazz.type = clazztype;
2788 TreeInfo.setSymbol(clazzid, TreeInfo.symbol(clazzid1));
2789 clazzid.type = ((JCIdent) clazzid).sym.type;
2790 if (annoclazzid != null) {
2791 annoclazzid.type = clazzid.type;
2792 }
2793 if (!clazztype.isErroneous()) {
2794 if (cdef != null && clazztype.tsym.isInterface()) {
2795 log.error(tree.encl.pos(), Errors.AnonClassImplIntfNoQualForNew);
2796 } else if (clazztype.tsym.isStatic()) {
2797 log.error(tree.encl.pos(), Errors.QualifiedNewOfStaticClass(clazztype.tsym));
2798 }
2799 }
2800 } else if (!clazztype.tsym.isInterface() &&
2801 clazztype.getEnclosingType().hasTag(CLASS)) {
2802 // Check for the existence of an apropos outer instance
2803 rs.resolveImplicitThis(tree.pos(), env, clazztype);
2804 }
2805
2806 // Attribute constructor arguments.
2807 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
2808 final KindSelector pkind =
2809 attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf);
2810 List<Type> argtypes = argtypesBuf.toList();
2811 List<Type> typeargtypes = attribTypes(tree.typeargs, localEnv);
2812
2813 if (clazztype.hasTag(CLASS) || clazztype.hasTag(ERROR)) {
2814 // Enums may not be instantiated except implicitly
2815 if ((clazztype.tsym.flags_field & Flags.ENUM) != 0 &&
2816 (!env.tree.hasTag(VARDEF) ||
2817 (((JCVariableDecl) env.tree).mods.flags & Flags.ENUM) == 0 ||
2818 ((JCVariableDecl) env.tree).init != tree))
2819 log.error(tree.pos(), Errors.EnumCantBeInstantiated);
2820
2821 boolean isSpeculativeDiamondInferenceRound = TreeInfo.isDiamond(tree) &&
2822 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
2823 boolean skipNonDiamondPath = false;
2824 // Check that class is not abstract
2825 if (cdef == null && !isSpeculativeDiamondInferenceRound && // class body may be nulled out in speculative tree copy
2826 (clazztype.tsym.flags() & (ABSTRACT | INTERFACE)) != 0) {
2827 log.error(tree.pos(),
2828 Errors.AbstractCantBeInstantiated(clazztype.tsym));
2829 skipNonDiamondPath = true;
2830 } else if (cdef != null && clazztype.tsym.isInterface()) {
2831 // Check that no constructor arguments are given to
2832 // anonymous classes implementing an interface
2833 if (!argtypes.isEmpty())
2834 log.error(tree.args.head.pos(), Errors.AnonClassImplIntfNoArgs);
2835
2836 if (!typeargtypes.isEmpty())
2837 log.error(tree.typeargs.head.pos(), Errors.AnonClassImplIntfNoTypeargs);
2838
2839 // Error recovery: pretend no arguments were supplied.
2840 argtypes = List.nil();
2841 typeargtypes = List.nil();
2842 skipNonDiamondPath = true;
2843 }
2844 if (TreeInfo.isDiamond(tree)) {
2845 ClassType site = new ClassType(clazztype.getEnclosingType(),
2846 clazztype.tsym.type.getTypeArguments(),
2847 clazztype.tsym,
2848 clazztype.getMetadata());
2849
2850 Env<AttrContext> diamondEnv = localEnv.dup(tree);
2851 diamondEnv.info.selectSuper = cdef != null || tree.classDeclRemoved();
2852 diamondEnv.info.pendingResolutionPhase = null;
2853
2854 //if the type of the instance creation expression is a class type
2855 //apply method resolution inference (JLS 15.12.2.7). The return type
2856 //of the resolved constructor will be a partially instantiated type
2857 Symbol constructor = rs.resolveDiamond(tree.pos(),
2858 diamondEnv,
2859 site,
2860 argtypes,
2861 typeargtypes);
2862 tree.constructor = constructor.baseSymbol();
2863
2864 final TypeSymbol csym = clazztype.tsym;
2865 ResultInfo diamondResult = new ResultInfo(pkind, newMethodTemplate(resultInfo.pt, argtypes, typeargtypes),
2866 diamondContext(tree, csym, resultInfo.checkContext), CheckMode.NO_TREE_UPDATE);
2867 Type constructorType = tree.constructorType = types.createErrorType(clazztype);
2868 constructorType = checkId(tree, site,
2869 constructor,
2870 diamondEnv,
2871 diamondResult);
2872
2873 tree.clazz.type = types.createErrorType(clazztype);
2874 if (!constructorType.isErroneous()) {
2875 tree.clazz.type = clazz.type = constructorType.getReturnType();
2876 tree.constructorType = types.createMethodTypeWithReturn(constructorType, syms.voidType);
2877 }
2878 clazztype = chk.checkClassType(tree.clazz, tree.clazz.type, true);
2879 }
2880
2881 // Resolve the called constructor under the assumption
2882 // that we are referring to a superclass instance of the
2883 // current instance (JLS ???).
2884 else if (!skipNonDiamondPath) {
2885 //the following code alters some of the fields in the current
2886 //AttrContext - hence, the current context must be dup'ed in
2887 //order to avoid downstream failures
2888 Env<AttrContext> rsEnv = localEnv.dup(tree);
2889 rsEnv.info.selectSuper = cdef != null;
2890 rsEnv.info.pendingResolutionPhase = null;
2891 tree.constructor = rs.resolveConstructor(
2892 tree.pos(), rsEnv, clazztype, argtypes, typeargtypes);
2893 if (cdef == null) { //do not check twice!
2894 tree.constructorType = checkId(tree,
2895 clazztype,
2896 tree.constructor,
2897 rsEnv,
2898 new ResultInfo(pkind, newMethodTemplate(syms.voidType, argtypes, typeargtypes), CheckMode.NO_TREE_UPDATE));
2899 if (rsEnv.info.lastResolveVarargs())
2900 Assert.check(tree.constructorType.isErroneous() || tree.varargsElement != null);
2901 }
2902 }
2903
2904 if (cdef != null) {
2905 visitAnonymousClassDefinition(tree, clazz, clazztype, cdef, localEnv, argtypes, typeargtypes, pkind);
2906 return;
2907 }
2908
2909 if (tree.constructor != null && tree.constructor.kind == MTH)
2910 owntype = clazztype;
2911 }
2912 result = check(tree, owntype, KindSelector.VAL, resultInfo);
2913 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
2914 if (tree.constructorType != null && inferenceContext.free(tree.constructorType)) {
2915 //we need to wait for inference to finish and then replace inference vars in the constructor type
2916 inferenceContext.addFreeTypeListener(List.of(tree.constructorType),
2917 instantiatedContext -> {
2918 tree.constructorType = instantiatedContext.asInstType(tree.constructorType);
2919 });
2920 }
2921 chk.validate(tree.typeargs, localEnv);
2922 }
2923
2924 // where
2925 private void visitAnonymousClassDefinition(JCNewClass tree, JCExpression clazz, Type clazztype,
2926 JCClassDecl cdef, Env<AttrContext> localEnv,
2927 List<Type> argtypes, List<Type> typeargtypes,
2928 KindSelector pkind) {
2929 // We are seeing an anonymous class instance creation.
2930 // In this case, the class instance creation
2931 // expression
2932 //
2933 // E.new <typeargs1>C<typargs2>(args) { ... }
2934 //
2935 // is represented internally as
2936 //
2937 // E . new <typeargs1>C<typargs2>(args) ( class <empty-name> { ... } ) .
2938 //
2939 // This expression is then *transformed* as follows:
2940 //
2941 // (1) add an extends or implements clause
2942 // (2) add a constructor.
2943 //
2944 // For instance, if C is a class, and ET is the type of E,
2945 // the expression
2946 //
2947 // E.new <typeargs1>C<typargs2>(args) { ... }
2948 //
2949 // is translated to (where X is a fresh name and typarams is the
2950 // parameter list of the super constructor):
2951 //
2952 // new <typeargs1>X(<*nullchk*>E, args) where
2953 // X extends C<typargs2> {
2954 // <typarams> X(ET e, args) {
2955 // e.<typeargs1>super(args)
2956 // }
2957 // ...
2958 // }
2959 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
2960 Type enclType = clazztype.getEnclosingType();
2961 if (enclType != null &&
2962 enclType.hasTag(CLASS) &&
2963 !chk.checkDenotable((ClassType)enclType)) {
2964 log.error(tree.encl, Errors.EnclosingClassTypeNonDenotable(enclType));
2965 }
2966 final boolean isDiamond = TreeInfo.isDiamond(tree);
2967 if (isDiamond
2968 && ((tree.constructorType != null && inferenceContext.free(tree.constructorType))
2969 || (tree.clazz.type != null && inferenceContext.free(tree.clazz.type)))) {
2970 final ResultInfo resultInfoForClassDefinition = this.resultInfo;
2971 Env<AttrContext> dupLocalEnv = copyEnv(localEnv);
2972 inferenceContext.addFreeTypeListener(List.of(tree.constructorType, tree.clazz.type),
2973 instantiatedContext -> {
2974 tree.constructorType = instantiatedContext.asInstType(tree.constructorType);
2975 tree.clazz.type = clazz.type = instantiatedContext.asInstType(clazz.type);
2976 ResultInfo prevResult = this.resultInfo;
2977 try {
2978 this.resultInfo = resultInfoForClassDefinition;
2979 visitAnonymousClassDefinition(tree, clazz, clazz.type, cdef,
2980 dupLocalEnv, argtypes, typeargtypes, pkind);
2981 } finally {
2982 this.resultInfo = prevResult;
2983 }
2984 });
2985 } else {
2986 if (isDiamond && clazztype.hasTag(CLASS)) {
2987 List<Type> invalidDiamondArgs = chk.checkDiamondDenotable((ClassType)clazztype);
2988 if (!clazztype.isErroneous() && invalidDiamondArgs.nonEmpty()) {
2989 // One or more types inferred in the previous steps is non-denotable.
2990 Fragment fragment = Diamond(clazztype.tsym);
2991 log.error(tree.clazz.pos(),
2992 Errors.CantApplyDiamond1(
2993 fragment,
2994 invalidDiamondArgs.size() > 1 ?
2995 DiamondInvalidArgs(invalidDiamondArgs, fragment) :
2996 DiamondInvalidArg(invalidDiamondArgs, fragment)));
2997 }
2998 // For <>(){}, inferred types must also be accessible.
2999 for (Type t : clazztype.getTypeArguments()) {
3000 rs.checkAccessibleType(env, t);
3001 }
3002 }
3003
3004 // If we already errored, be careful to avoid a further avalanche. ErrorType answers
3005 // false for isInterface call even when the original type is an interface.
3006 boolean implementing = clazztype.tsym.isInterface() ||
3007 clazztype.isErroneous() && !clazztype.getOriginalType().hasTag(NONE) &&
3008 clazztype.getOriginalType().tsym.isInterface();
3009
3010 if (implementing) {
3011 cdef.implementing = List.of(clazz);
3012 } else {
3013 cdef.extending = clazz;
3014 }
3015
3016 if (resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3017 rs.isSerializable(clazztype)) {
3018 localEnv.info.isSerializable = true;
3019 }
3020
3021 attribStat(cdef, localEnv);
3022
3023 List<Type> finalargtypes;
3024 // If an outer instance is given,
3025 // prefix it to the constructor arguments
3026 // and delete it from the new expression
3027 if (tree.encl != null && !clazztype.tsym.isInterface()) {
3028 finalargtypes = argtypes.prepend(tree.encl.type);
3029 } else {
3030 finalargtypes = argtypes;
3031 }
3032
3033 // Reassign clazztype and recompute constructor. As this necessarily involves
3034 // another attribution pass for deferred types in the case of <>, replicate
3035 // them. Original arguments have right decorations already.
3036 if (isDiamond && pkind.contains(KindSelector.POLY)) {
3037 finalargtypes = finalargtypes.map(deferredAttr.deferredCopier);
3038 }
3039
3040 clazztype = clazztype.hasTag(ERROR) ? types.createErrorType(cdef.sym.type)
3041 : cdef.sym.type;
3042 Symbol sym = tree.constructor = rs.resolveConstructor(
3043 tree.pos(), localEnv, clazztype, finalargtypes, typeargtypes);
3044 Assert.check(!sym.kind.isResolutionError());
3045 tree.constructor = sym;
3046 tree.constructorType = checkId(tree,
3047 clazztype,
3048 tree.constructor,
3049 localEnv,
3050 new ResultInfo(pkind, newMethodTemplate(syms.voidType, finalargtypes, typeargtypes), CheckMode.NO_TREE_UPDATE));
3051 }
3052 Type owntype = (tree.constructor != null && tree.constructor.kind == MTH) ?
3053 clazztype : types.createErrorType(tree.type);
3054 result = check(tree, owntype, KindSelector.VAL, resultInfo.dup(CheckMode.NO_INFERENCE_HOOK));
3055 chk.validate(tree.typeargs, localEnv);
3056 }
3057
3058 CheckContext diamondContext(JCNewClass clazz, TypeSymbol tsym, CheckContext checkContext) {
3059 return new Check.NestedCheckContext(checkContext) {
3060 @Override
3061 public void report(DiagnosticPosition _unused, JCDiagnostic details) {
3062 enclosingContext.report(clazz.clazz,
3063 diags.fragment(Fragments.CantApplyDiamond1(Fragments.Diamond(tsym), details)));
3064 }
3065 };
3066 }
3067
3068 /** Make an attributed null check tree.
3069 */
3070 public JCExpression makeNullCheck(JCExpression arg) {
3071 // optimization: new Outer() can never be null; skip null check
3072 if (arg.getTag() == NEWCLASS)
3073 return arg;
3074 // optimization: X.this is never null; skip null check
3075 Name name = TreeInfo.name(arg);
3076 if (name == names._this || name == names._super) return arg;
3077
3078 JCTree.Tag optag = NULLCHK;
3079 JCUnary tree = make.at(arg.pos).Unary(optag, arg);
3080 tree.operator = operators.resolveUnary(arg, optag, arg.type);
3081 tree.type = arg.type;
3082 return tree;
3083 }
3084
3085 public void visitNewArray(JCNewArray tree) {
3086 Type owntype = types.createErrorType(tree.type);
3087 Env<AttrContext> localEnv = env.dup(tree);
3088 Type elemtype;
3089 if (tree.elemtype != null) {
3090 elemtype = attribType(tree.elemtype, localEnv);
3091 chk.validate(tree.elemtype, localEnv);
3092 owntype = elemtype;
3093 for (List<JCExpression> l = tree.dims; l.nonEmpty(); l = l.tail) {
3094 attribExpr(l.head, localEnv, syms.intType);
3095 owntype = new ArrayType(owntype, syms.arrayClass);
3096 }
3097 } else {
3098 // we are seeing an untyped aggregate { ... }
3099 // this is allowed only if the prototype is an array
3100 if (pt().hasTag(ARRAY)) {
3101 elemtype = types.elemtype(pt());
3102 } else {
3103 if (!pt().hasTag(ERROR) &&
3104 (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3105 log.error(tree.pos(),
3106 Errors.IllegalInitializerForType(pt()));
3107 }
3108 elemtype = types.createErrorType(pt());
3109 }
3110 }
3111 if (tree.elems != null) {
3112 attribExprs(tree.elems, localEnv, elemtype);
3113 owntype = new ArrayType(elemtype, syms.arrayClass);
3114 }
3115 if (!types.isReifiable(elemtype))
3116 log.error(tree.pos(), Errors.GenericArrayCreation);
3117 result = check(tree, owntype, KindSelector.VAL, resultInfo);
3118 }
3119
3120 /*
3121 * A lambda expression can only be attributed when a target-type is available.
3122 * In addition, if the target-type is that of a functional interface whose
3123 * descriptor contains inference variables in argument position the lambda expression
3124 * is 'stuck' (see DeferredAttr).
3125 */
3126 @Override
3127 public void visitLambda(final JCLambda that) {
3128 boolean wrongContext = false;
3129 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
3130 if (pt().hasTag(NONE) && (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3131 //lambda only allowed in assignment or method invocation/cast context
3132 log.error(that.pos(), Errors.UnexpectedLambda);
3133 }
3134 resultInfo = recoveryInfo;
3135 wrongContext = true;
3136 }
3137 if (types.isQuoted(pt())) {
3138 attribQuotedLambda(that);
3139 } else {
3140 attribFunctionalLambda(that, wrongContext);
3141 }
3142 }
3143
3144 void attribFunctionalLambda(JCLambda that, boolean wrongContext) {
3145 //create an environment for attribution of the lambda expression
3146 final Env<AttrContext> localEnv = lambdaEnv(that, env);
3147 boolean needsRecovery =
3148 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK;
3149 try {
3150 if (needsRecovery && rs.isSerializable(pt())) {
3151 localEnv.info.isSerializable = true;
3152 localEnv.info.isSerializableLambda = true;
3153 }
3154 List<Type> explicitParamTypes = null;
3155 if (that.paramKind == JCLambda.ParameterKind.EXPLICIT) {
3156 //attribute lambda parameters
3157 attribStats(that.params, localEnv);
3158 explicitParamTypes = TreeInfo.types(that.params);
3159 }
3160
3161 TargetInfo targetInfo = getTargetInfo(that, resultInfo, explicitParamTypes);
3162 Type currentTarget = targetInfo.target;
3163 Type lambdaType = targetInfo.descriptor;
3164
3165 if (currentTarget.isErroneous()) {
3166 result = that.type = currentTarget;
3167 return;
3168 }
3169
3170 setFunctionalInfo(localEnv, that, pt(), lambdaType, currentTarget, resultInfo.checkContext);
3171
3172 if (lambdaType.hasTag(FORALL)) {
3173 //lambda expression target desc cannot be a generic method
3174 Fragment msg = Fragments.InvalidGenericLambdaTarget(lambdaType,
3175 kindName(currentTarget.tsym),
3176 currentTarget.tsym);
3177 resultInfo.checkContext.report(that, diags.fragment(msg));
3178 result = that.type = types.createErrorType(pt());
3179 return;
3180 }
3181
3182 if (that.paramKind == JCLambda.ParameterKind.IMPLICIT) {
3183 //add param type info in the AST
3184 List<Type> actuals = lambdaType.getParameterTypes();
3185 List<JCVariableDecl> params = that.params;
3186
3187 boolean arityMismatch = false;
3188
3189 while (params.nonEmpty()) {
3190 if (actuals.isEmpty()) {
3191 //not enough actuals to perform lambda parameter inference
3192 arityMismatch = true;
3193 }
3194 //reset previously set info
3195 Type argType = arityMismatch ?
3196 syms.errType :
3197 actuals.head;
3198 if (params.head.isImplicitlyTyped()) {
3199 setSyntheticVariableType(params.head, argType);
3200 }
3201 params.head.sym = null;
3202 actuals = actuals.isEmpty() ?
3203 actuals :
3204 actuals.tail;
3205 params = params.tail;
3206 }
3207
3208 //attribute lambda parameters
3209 attribStats(that.params, localEnv);
3210
3211 if (arityMismatch) {
3212 resultInfo.checkContext.report(that, diags.fragment(Fragments.IncompatibleArgTypesInLambda));
3213 result = that.type = types.createErrorType(currentTarget);
3214 return;
3215 }
3216 }
3217
3218 //from this point on, no recovery is needed; if we are in assignment context
3219 //we will be able to attribute the whole lambda body, regardless of errors;
3220 //if we are in a 'check' method context, and the lambda is not compatible
3221 //with the target-type, it will be recovered anyway in Attr.checkId
3222 needsRecovery = false;
3223
3224 ResultInfo bodyResultInfo = localEnv.info.returnResult =
3225 lambdaBodyResult(that, lambdaType, resultInfo);
3226
3227 if (that.getBodyKind() == JCLambda.BodyKind.EXPRESSION) {
3228 attribTree(that.getBody(), localEnv, bodyResultInfo);
3229 } else {
3230 JCBlock body = (JCBlock)that.body;
3231 if (body == breakTree &&
3232 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
3233 breakTreeFound(copyEnv(localEnv));
3234 }
3235 attribStats(body.stats, localEnv);
3236 }
3237
3238 result = check(that, currentTarget, KindSelector.VAL, resultInfo);
3239
3240 boolean isSpeculativeRound =
3241 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
3242
3243 preFlow(that);
3244 flow.analyzeLambda(env, that, make, isSpeculativeRound);
3245
3246 that.type = currentTarget; //avoids recovery at this stage
3247 checkLambdaCompatible(that, lambdaType, resultInfo.checkContext);
3248
3249 if (!isSpeculativeRound) {
3250 //add thrown types as bounds to the thrown types free variables if needed:
3251 if (resultInfo.checkContext.inferenceContext().free(lambdaType.getThrownTypes())) {
3252 List<Type> inferredThrownTypes = flow.analyzeLambdaThrownTypes(env, that, make);
3253 if(!checkExConstraints(inferredThrownTypes, lambdaType.getThrownTypes(), resultInfo.checkContext.inferenceContext())) {
3254 log.error(that, Errors.IncompatibleThrownTypesInMref(lambdaType.getThrownTypes()));
3255 }
3256 }
3257
3258 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), lambdaType, currentTarget);
3259 }
3260 result = wrongContext ? that.type = types.createErrorType(pt())
3261 : check(that, currentTarget, KindSelector.VAL, resultInfo);
3262 } catch (Types.FunctionDescriptorLookupError ex) {
3263 JCDiagnostic cause = ex.getDiagnostic();
3264 resultInfo.checkContext.report(that, cause);
3265 result = that.type = types.createErrorType(pt());
3266 return;
3267 } catch (CompletionFailure cf) {
3268 chk.completionError(that.pos(), cf);
3269 } catch (Throwable t) {
3270 //when an unexpected exception happens, avoid attempts to attribute the same tree again
3271 //as that would likely cause the same exception again.
3272 needsRecovery = false;
3273 throw t;
3274 } finally {
3275 localEnv.info.scope.leave();
3276 if (needsRecovery) {
3277 Type prevResult = result;
3278 try {
3279 attribTree(that, env, recoveryInfo);
3280 } finally {
3281 if (result == Type.recoveryType) {
3282 result = prevResult;
3283 }
3284 }
3285 }
3286 }
3287 }
3288
3289 void attribQuotedLambda(JCLambda that) {
3290 // create an environment for attribution of the lambda expression
3291 final Env<AttrContext> localEnv = lambdaEnv(that, env);
3292 try {
3293 // if quoted lambda is implicit, issue error, and recover
3294 if (that.paramKind == ParameterKind.IMPLICIT) {
3295 log.error(that, Errors.QuotedLambdaMustBeExplicit);
3296 // recovery
3297 List<JCVariableDecl> params = that.params;
3298 while (params.nonEmpty()) {
3299 Type argType = syms.errType;
3300 if (params.head.isImplicitlyTyped()) {
3301 setSyntheticVariableType(params.head, argType);
3302 }
3303 params = params.tail;
3304 }
3305 }
3306 // attribute lambda parameters
3307 attribStats(that.params, localEnv);
3308 List<Type> explicitParamTypes = TreeInfo.types(that.params);
3309
3310 ListBuffer<Type> restypes = new ListBuffer<>();
3311 ListBuffer<DiagnosticPosition> resPositions = new ListBuffer<>();
3312 ResultInfo bodyResultInfo = localEnv.info.returnResult = unknownExprInfo;
3313
3314 // type-check lambda body, and capture return types
3315 if (that.getBodyKind() == JCLambda.BodyKind.EXPRESSION) {
3316 attribTree(that.getBody(), localEnv, bodyResultInfo);
3317 restypes.add(that.getBody().type);
3318 } else {
3319 JCBlock body = (JCBlock)that.body;
3320 if (body == breakTree &&
3321 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
3322 breakTreeFound(copyEnv(localEnv));
3323 }
3324 attribStats(body.stats, localEnv);
3325 new LambdaReturnScanner() {
3326 @Override
3327 public void visitReturn(JCReturn tree) {
3328 if (tree.expr != null) {
3329 resPositions.add(tree);
3330 }
3331 restypes.add(tree.expr == null ? syms.voidType : tree.expr.type);
3332 }
3333 }.scan(body);
3334 }
3335
3336 // check if lambda body can complete normally
3337 preFlow(that);
3338 flow.analyzeLambda(localEnv, that, make, false);
3339
3340 final Type restype;
3341 if (that.getBodyKind() == BodyKind.STATEMENT) {
3342 if (that.canCompleteNormally) {
3343 // a lambda that completes normally has an implicit void return
3344 restypes.add(syms.voidType);
3345 }
3346
3347 boolean hasNonVoidReturn = restypes.toList()
3348 .stream().anyMatch(t -> t != syms.voidType);
3349 boolean hasVoidReturn = restypes.toList()
3350 .stream().anyMatch(t -> t == syms.voidType);
3351
3352 if (hasVoidReturn && hasNonVoidReturn) {
3353 // void vs. non-void mismatch
3354 log.error(that.body, Errors.CantInferQuotedLambdaReturnType(restypes.toList()));
3355 restype = syms.errorType;
3356 } else if (hasVoidReturn) {
3357 restype = syms.voidType;
3358 } else {
3359 restype = condType(resPositions.toList(), restypes.toList());
3360 }
3361 } else {
3362 restype = restypes.first();
3363 }
3364
3365 // infer lambda return type using lub
3366 if (restype.hasTag(ERROR)) {
3367 // some other error occurred
3368 log.error(that.body, Errors.CantInferQuotedLambdaReturnType(restypes.toList()));
3369 }
3370
3371 // infer thrown types
3372 List<Type> thrownTypes = flow.analyzeLambdaThrownTypes(localEnv, that, make);
3373
3374 // set up target descriptor with explicit parameter types, and inferred thrown/return types
3375 that.target = new MethodType(explicitParamTypes, restype, thrownTypes, syms.methodClass);
3376 result = that.type = pt();
3377 } finally {
3378 localEnv.info.scope.leave();
3379 }
3380 }
3381 //where
3382 class TargetInfo {
3383 Type target;
3384 Type descriptor;
3385
3386 public TargetInfo(Type target, Type descriptor) {
3387 this.target = target;
3388 this.descriptor = descriptor;
3389 }
3390 }
3391
3392 TargetInfo getTargetInfo(JCPolyExpression that, ResultInfo resultInfo, List<Type> explicitParamTypes) {
3393 Type lambdaType;
3394 Type currentTarget = resultInfo.pt;
3395 if (resultInfo.pt != Type.recoveryType) {
3396 /* We need to adjust the target. If the target is an
3397 * intersection type, for example: SAM & I1 & I2 ...
3398 * the target will be updated to SAM
3399 */
3400 currentTarget = targetChecker.visit(currentTarget, that);
3401 if (!currentTarget.isIntersection()) {
3402 if (explicitParamTypes != null) {
3403 currentTarget = infer.instantiateFunctionalInterface(that,
3404 currentTarget, explicitParamTypes, resultInfo.checkContext);
3405 }
3406 currentTarget = types.removeWildcards(currentTarget);
3407 lambdaType = types.findDescriptorType(currentTarget);
3408 } else {
3409 IntersectionClassType ict = (IntersectionClassType)currentTarget;
3410 ListBuffer<Type> components = new ListBuffer<>();
3411 for (Type bound : ict.getExplicitComponents()) {
3412 if (explicitParamTypes != null) {
3413 try {
3414 bound = infer.instantiateFunctionalInterface(that,
3415 bound, explicitParamTypes, resultInfo.checkContext);
3416 } catch (FunctionDescriptorLookupError t) {
3417 // do nothing
3418 }
3419 }
3420 bound = types.removeWildcards(bound);
3421 components.add(bound);
3422 }
3423 currentTarget = types.makeIntersectionType(components.toList());
3424 currentTarget.tsym.flags_field |= INTERFACE;
3425 lambdaType = types.findDescriptorType(currentTarget);
3426 }
3427
3428 } else {
3429 currentTarget = Type.recoveryType;
3430 lambdaType = fallbackDescriptorType(that);
3431 }
3432 if (that.hasTag(LAMBDA) && lambdaType.hasTag(FORALL)) {
3433 //lambda expression target desc cannot be a generic method
3434 Fragment msg = Fragments.InvalidGenericLambdaTarget(lambdaType,
3435 kindName(currentTarget.tsym),
3436 currentTarget.tsym);
3437 resultInfo.checkContext.report(that, diags.fragment(msg));
3438 currentTarget = types.createErrorType(pt());
3439 }
3440 return new TargetInfo(currentTarget, lambdaType);
3441 }
3442
3443 void preFlow(JCLambda tree) {
3444 attrRecover.doRecovery();
3445 new PostAttrAnalyzer() {
3446 @Override
3447 public void scan(JCTree tree) {
3448 if (tree == null ||
3449 (tree.type != null &&
3450 tree.type == Type.stuckType)) {
3451 //don't touch stuck expressions!
3452 return;
3453 }
3454 super.scan(tree);
3455 }
3456
3457 @Override
3458 public void visitClassDef(JCClassDecl that) {
3459 // or class declaration trees!
3460 }
3461
3462 public void visitLambda(JCLambda that) {
3463 // or lambda expressions!
3464 }
3465 }.scan(tree.body);
3466 }
3467
3468 Types.MapVisitor<DiagnosticPosition> targetChecker = new Types.MapVisitor<DiagnosticPosition>() {
3469
3470 @Override
3471 public Type visitClassType(ClassType t, DiagnosticPosition pos) {
3472 return t.isIntersection() ?
3473 visitIntersectionClassType((IntersectionClassType)t, pos) : t;
3474 }
3475
3476 public Type visitIntersectionClassType(IntersectionClassType ict, DiagnosticPosition pos) {
3477 types.findDescriptorSymbol(makeNotionalInterface(ict, pos));
3478 return ict;
3479 }
3480
3481 private TypeSymbol makeNotionalInterface(IntersectionClassType ict, DiagnosticPosition pos) {
3482 ListBuffer<Type> targs = new ListBuffer<>();
3483 ListBuffer<Type> supertypes = new ListBuffer<>();
3484 for (Type i : ict.interfaces_field) {
3485 if (i.isParameterized()) {
3486 targs.appendList(i.tsym.type.allparams());
3487 }
3488 supertypes.append(i.tsym.type);
3489 }
3490 IntersectionClassType notionalIntf = types.makeIntersectionType(supertypes.toList());
3491 notionalIntf.allparams_field = targs.toList();
3492 notionalIntf.tsym.flags_field |= INTERFACE;
3493 return notionalIntf.tsym;
3494 }
3495 };
3496
3497 private Type fallbackDescriptorType(JCExpression tree) {
3498 switch (tree.getTag()) {
3499 case LAMBDA:
3500 JCLambda lambda = (JCLambda)tree;
3501 List<Type> argtypes = List.nil();
3502 for (JCVariableDecl param : lambda.params) {
3503 argtypes = param.vartype != null && param.vartype.type != null ?
3504 argtypes.append(param.vartype.type) :
3505 argtypes.append(syms.errType);
3506 }
3507 return new MethodType(argtypes, Type.recoveryType,
3508 List.of(syms.throwableType), syms.methodClass);
3509 case REFERENCE:
3510 return new MethodType(List.nil(), Type.recoveryType,
3511 List.of(syms.throwableType), syms.methodClass);
3512 default:
3513 Assert.error("Cannot get here!");
3514 }
3515 return null;
3516 }
3517
3518 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
3519 final InferenceContext inferenceContext, final Type... ts) {
3520 checkAccessibleTypes(pos, env, inferenceContext, List.from(ts));
3521 }
3522
3523 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
3524 final InferenceContext inferenceContext, final List<Type> ts) {
3525 if (inferenceContext.free(ts)) {
3526 inferenceContext.addFreeTypeListener(ts,
3527 solvedContext -> checkAccessibleTypes(pos, env, solvedContext, solvedContext.asInstTypes(ts)));
3528 } else {
3529 for (Type t : ts) {
3530 rs.checkAccessibleType(env, t);
3531 }
3532 }
3533 }
3534
3535 /**
3536 * Lambda/method reference have a special check context that ensures
3537 * that i.e. a lambda return type is compatible with the expected
3538 * type according to both the inherited context and the assignment
3539 * context.
3540 */
3541 class FunctionalReturnContext extends Check.NestedCheckContext {
3542
3543 FunctionalReturnContext(CheckContext enclosingContext) {
3544 super(enclosingContext);
3545 }
3546
3547 @Override
3548 public boolean compatible(Type found, Type req, Warner warn) {
3549 //return type must be compatible in both current context and assignment context
3550 return chk.basicHandler.compatible(inferenceContext().asUndetVar(found), inferenceContext().asUndetVar(req), warn);
3551 }
3552
3553 @Override
3554 public void report(DiagnosticPosition pos, JCDiagnostic details) {
3555 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleRetTypeInLambda(details)));
3556 }
3557 }
3558
3559 class ExpressionLambdaReturnContext extends FunctionalReturnContext {
3560
3561 JCExpression expr;
3562 boolean expStmtExpected;
3563
3564 ExpressionLambdaReturnContext(JCExpression expr, CheckContext enclosingContext) {
3565 super(enclosingContext);
3566 this.expr = expr;
3567 }
3568
3569 @Override
3570 public void report(DiagnosticPosition pos, JCDiagnostic details) {
3571 if (expStmtExpected) {
3572 enclosingContext.report(pos, diags.fragment(Fragments.StatExprExpected));
3573 } else {
3574 super.report(pos, details);
3575 }
3576 }
3577
3578 @Override
3579 public boolean compatible(Type found, Type req, Warner warn) {
3580 //a void return is compatible with an expression statement lambda
3581 if (req.hasTag(VOID)) {
3582 expStmtExpected = true;
3583 return TreeInfo.isExpressionStatement(expr);
3584 } else {
3585 return super.compatible(found, req, warn);
3586 }
3587 }
3588 }
3589
3590 ResultInfo lambdaBodyResult(JCLambda that, Type descriptor, ResultInfo resultInfo) {
3591 FunctionalReturnContext funcContext = that.getBodyKind() == JCLambda.BodyKind.EXPRESSION ?
3592 new ExpressionLambdaReturnContext((JCExpression)that.getBody(), resultInfo.checkContext) :
3593 new FunctionalReturnContext(resultInfo.checkContext);
3594
3595 return descriptor.getReturnType() == Type.recoveryType ?
3596 recoveryInfo :
3597 new ResultInfo(KindSelector.VAL,
3598 descriptor.getReturnType(), funcContext);
3599 }
3600
3601 /**
3602 * Lambda compatibility. Check that given return types, thrown types, parameter types
3603 * are compatible with the expected functional interface descriptor. This means that:
3604 * (i) parameter types must be identical to those of the target descriptor; (ii) return
3605 * types must be compatible with the return type of the expected descriptor.
3606 */
3607 void checkLambdaCompatible(JCLambda tree, Type descriptor, CheckContext checkContext) {
3608 Type returnType = checkContext.inferenceContext().asUndetVar(descriptor.getReturnType());
3609
3610 //return values have already been checked - but if lambda has no return
3611 //values, we must ensure that void/value compatibility is correct;
3612 //this amounts at checking that, if a lambda body can complete normally,
3613 //the descriptor's return type must be void
3614 if (tree.getBodyKind() == JCLambda.BodyKind.STATEMENT && tree.canCompleteNormally &&
3615 !returnType.hasTag(VOID) && returnType != Type.recoveryType) {
3616 Fragment msg =
3617 Fragments.IncompatibleRetTypeInLambda(Fragments.MissingRetVal(returnType));
3618 checkContext.report(tree,
3619 diags.fragment(msg));
3620 }
3621
3622 List<Type> argTypes = checkContext.inferenceContext().asUndetVars(descriptor.getParameterTypes());
3623 if (!types.isSameTypes(argTypes, TreeInfo.types(tree.params))) {
3624 checkContext.report(tree, diags.fragment(Fragments.IncompatibleArgTypesInLambda));
3625 }
3626 }
3627
3628 /* Map to hold 'fake' clinit methods. If a lambda is used to initialize a
3629 * static field and that lambda has type annotations, these annotations will
3630 * also be stored at these fake clinit methods.
3631 *
3632 * LambdaToMethod also use fake clinit methods so they can be reused.
3633 * Also as LTM is a phase subsequent to attribution, the methods from
3634 * clinits can be safely removed by LTM to save memory.
3635 */
3636 private Map<ClassSymbol, MethodSymbol> clinits = new HashMap<>();
3637
3638 public MethodSymbol removeClinit(ClassSymbol sym) {
3639 return clinits.remove(sym);
3640 }
3641
3642 /* This method returns an environment to be used to attribute a lambda
3643 * expression.
3644 *
3645 * The owner of this environment is a method symbol. If the current owner
3646 * is not a method, for example if the lambda is used to initialize
3647 * a field, then if the field is:
3648 *
3649 * - an instance field, we use the first constructor.
3650 * - a static field, we create a fake clinit method.
3651 */
3652 public Env<AttrContext> lambdaEnv(JCLambda that, Env<AttrContext> env) {
3653 Env<AttrContext> lambdaEnv;
3654 Symbol owner = env.info.scope.owner;
3655 if (owner.kind == VAR && owner.owner.kind == TYP) {
3656 //field initializer
3657 ClassSymbol enclClass = owner.enclClass();
3658 Symbol newScopeOwner = env.info.scope.owner;
3659 /* if the field isn't static, then we can get the first constructor
3660 * and use it as the owner of the environment. This is what
3661 * LTM code is doing to look for type annotations so we are fine.
3662 */
3663 if ((owner.flags() & STATIC) == 0) {
3664 for (Symbol s : enclClass.members_field.getSymbolsByName(names.init)) {
3665 newScopeOwner = s;
3666 break;
3667 }
3668 } else {
3669 /* if the field is static then we need to create a fake clinit
3670 * method, this method can later be reused by LTM.
3671 */
3672 MethodSymbol clinit = clinits.get(enclClass);
3673 if (clinit == null) {
3674 Type clinitType = new MethodType(List.nil(),
3675 syms.voidType, List.nil(), syms.methodClass);
3676 clinit = new MethodSymbol(STATIC | SYNTHETIC | PRIVATE,
3677 names.clinit, clinitType, enclClass);
3678 clinit.params = List.nil();
3679 clinits.put(enclClass, clinit);
3680 }
3681 newScopeOwner = clinit;
3682 }
3683 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dupUnshared(newScopeOwner)));
3684 } else {
3685 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dup()));
3686 }
3687 lambdaEnv.info.yieldResult = null;
3688 lambdaEnv.info.isLambda = true;
3689 return lambdaEnv;
3690 }
3691
3692 @Override
3693 public void visitReference(final JCMemberReference that) {
3694 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
3695 if (pt().hasTag(NONE) && (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3696 //method reference only allowed in assignment or method invocation/cast context
3697 log.error(that.pos(), Errors.UnexpectedMref);
3698 }
3699 result = that.type = types.createErrorType(pt());
3700 return;
3701 }
3702 final Env<AttrContext> localEnv = env.dup(that);
3703 try {
3704 //attribute member reference qualifier - if this is a constructor
3705 //reference, the expected kind must be a type
3706 Type exprType = attribTree(that.expr, env, memberReferenceQualifierResult(that));
3707
3708 if (that.getMode() == JCMemberReference.ReferenceMode.NEW) {
3709 exprType = chk.checkConstructorRefType(that.expr, exprType);
3710 if (!exprType.isErroneous() &&
3711 exprType.isRaw() &&
3712 that.typeargs != null) {
3713 log.error(that.expr.pos(),
3714 Errors.InvalidMref(Kinds.kindName(that.getMode()),
3715 Fragments.MrefInferAndExplicitParams));
3716 exprType = types.createErrorType(exprType);
3717 }
3718 }
3719
3720 if (exprType.isErroneous()) {
3721 //if the qualifier expression contains problems,
3722 //give up attribution of method reference
3723 result = that.type = exprType;
3724 return;
3725 }
3726
3727 if (TreeInfo.isStaticSelector(that.expr, names)) {
3728 //if the qualifier is a type, validate it; raw warning check is
3729 //omitted as we don't know at this stage as to whether this is a
3730 //raw selector (because of inference)
3731 chk.validate(that.expr, env, false);
3732 } else {
3733 Symbol lhsSym = TreeInfo.symbol(that.expr);
3734 localEnv.info.selectSuper = lhsSym != null && lhsSym.name == names._super;
3735 }
3736 //attrib type-arguments
3737 List<Type> typeargtypes = List.nil();
3738 if (that.typeargs != null) {
3739 typeargtypes = attribTypes(that.typeargs, localEnv);
3740 }
3741
3742 boolean isTargetSerializable =
3743 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3744 rs.isSerializable(pt());
3745 TargetInfo targetInfo = getTargetInfo(that, resultInfo, null);
3746 Type currentTarget = targetInfo.target;
3747 Type desc = targetInfo.descriptor;
3748
3749 setFunctionalInfo(localEnv, that, pt(), desc, currentTarget, resultInfo.checkContext);
3750 List<Type> argtypes = desc.getParameterTypes();
3751 Resolve.MethodCheck referenceCheck = rs.resolveMethodCheck;
3752
3753 if (resultInfo.checkContext.inferenceContext().free(argtypes)) {
3754 referenceCheck = rs.new MethodReferenceCheck(resultInfo.checkContext.inferenceContext());
3755 }
3756
3757 Pair<Symbol, Resolve.ReferenceLookupHelper> refResult = null;
3758 List<Type> saved_undet = resultInfo.checkContext.inferenceContext().save();
3759 try {
3760 refResult = rs.resolveMemberReference(localEnv, that, that.expr.type,
3761 that.name, argtypes, typeargtypes, targetInfo.descriptor, referenceCheck,
3762 resultInfo.checkContext.inferenceContext(), rs.basicReferenceChooser);
3763 } finally {
3764 resultInfo.checkContext.inferenceContext().rollback(saved_undet);
3765 }
3766
3767 Symbol refSym = refResult.fst;
3768 Resolve.ReferenceLookupHelper lookupHelper = refResult.snd;
3769
3770 /** this switch will need to go away and be replaced by the new RESOLUTION_TARGET testing
3771 * JDK-8075541
3772 */
3773 if (refSym.kind != MTH) {
3774 boolean targetError;
3775 switch (refSym.kind) {
3776 case ABSENT_MTH:
3777 case MISSING_ENCL:
3778 targetError = false;
3779 break;
3780 case WRONG_MTH:
3781 case WRONG_MTHS:
3782 case AMBIGUOUS:
3783 case HIDDEN:
3784 case STATICERR:
3785 targetError = true;
3786 break;
3787 default:
3788 Assert.error("unexpected result kind " + refSym.kind);
3789 targetError = false;
3790 }
3791
3792 JCDiagnostic detailsDiag = ((Resolve.ResolveError)refSym.baseSymbol())
3793 .getDiagnostic(JCDiagnostic.DiagnosticType.FRAGMENT,
3794 that, exprType.tsym, exprType, that.name, argtypes, typeargtypes);
3795
3796 JCDiagnostic diag = diags.create(log.currentSource(), that,
3797 targetError ?
3798 Fragments.InvalidMref(Kinds.kindName(that.getMode()), detailsDiag) :
3799 Errors.InvalidMref(Kinds.kindName(that.getMode()), detailsDiag));
3800
3801 if (targetError && currentTarget == Type.recoveryType) {
3802 //a target error doesn't make sense during recovery stage
3803 //as we don't know what actual parameter types are
3804 result = that.type = currentTarget;
3805 return;
3806 } else {
3807 if (targetError) {
3808 resultInfo.checkContext.report(that, diag);
3809 } else {
3810 log.report(diag);
3811 }
3812 result = that.type = types.createErrorType(currentTarget);
3813 return;
3814 }
3815 }
3816
3817 that.sym = refSym.isConstructor() ? refSym.baseSymbol() : refSym;
3818 that.kind = lookupHelper.referenceKind(that.sym);
3819 that.ownerAccessible = rs.isAccessible(localEnv, that.sym.enclClass());
3820
3821 if (desc.getReturnType() == Type.recoveryType) {
3822 // stop here
3823 result = that.type = currentTarget;
3824 return;
3825 }
3826
3827 if (!env.info.attributionMode.isSpeculative && that.getMode() == JCMemberReference.ReferenceMode.NEW) {
3828 Type enclosingType = exprType.getEnclosingType();
3829 if (enclosingType != null && enclosingType.hasTag(CLASS)) {
3830 // Check for the existence of an appropriate outer instance
3831 rs.resolveImplicitThis(that.pos(), env, exprType);
3832 }
3833 }
3834
3835 if (resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
3836
3837 if (that.getMode() == ReferenceMode.INVOKE &&
3838 TreeInfo.isStaticSelector(that.expr, names) &&
3839 that.kind.isUnbound() &&
3840 lookupHelper.site.isRaw()) {
3841 chk.checkRaw(that.expr, localEnv);
3842 }
3843
3844 if (that.sym.isStatic() && TreeInfo.isStaticSelector(that.expr, names) &&
3845 exprType.getTypeArguments().nonEmpty()) {
3846 //static ref with class type-args
3847 log.error(that.expr.pos(),
3848 Errors.InvalidMref(Kinds.kindName(that.getMode()),
3849 Fragments.StaticMrefWithTargs));
3850 result = that.type = types.createErrorType(currentTarget);
3851 return;
3852 }
3853
3854 if (!refSym.isStatic() && that.kind == JCMemberReference.ReferenceKind.SUPER) {
3855 // Check that super-qualified symbols are not abstract (JLS)
3856 rs.checkNonAbstract(that.pos(), that.sym);
3857 }
3858
3859 if (isTargetSerializable) {
3860 chk.checkAccessFromSerializableElement(that, true);
3861 }
3862 }
3863
3864 ResultInfo checkInfo =
3865 resultInfo.dup(newMethodTemplate(
3866 desc.getReturnType().hasTag(VOID) ? Type.noType : desc.getReturnType(),
3867 that.kind.isUnbound() ? argtypes.tail : argtypes, typeargtypes),
3868 new FunctionalReturnContext(resultInfo.checkContext), CheckMode.NO_TREE_UPDATE);
3869
3870 Type refType = checkId(that, lookupHelper.site, refSym, localEnv, checkInfo);
3871
3872 if (that.kind.isUnbound() &&
3873 resultInfo.checkContext.inferenceContext().free(argtypes.head)) {
3874 //re-generate inference constraints for unbound receiver
3875 if (!types.isSubtype(resultInfo.checkContext.inferenceContext().asUndetVar(argtypes.head), exprType)) {
3876 //cannot happen as this has already been checked - we just need
3877 //to regenerate the inference constraints, as that has been lost
3878 //as a result of the call to inferenceContext.save()
3879 Assert.error("Can't get here");
3880 }
3881 }
3882
3883 if (!refType.isErroneous()) {
3884 refType = types.createMethodTypeWithReturn(refType,
3885 adjustMethodReturnType(refSym, lookupHelper.site, that.name, checkInfo.pt.getParameterTypes(), refType.getReturnType()));
3886 }
3887
3888 //go ahead with standard method reference compatibility check - note that param check
3889 //is a no-op (as this has been taken care during method applicability)
3890 boolean isSpeculativeRound =
3891 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
3892
3893 that.type = currentTarget; //avoids recovery at this stage
3894 checkReferenceCompatible(that, desc, refType, resultInfo.checkContext, isSpeculativeRound);
3895 if (!isSpeculativeRound) {
3896 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), desc, currentTarget);
3897 }
3898 result = check(that, currentTarget, KindSelector.VAL, resultInfo);
3899 } catch (Types.FunctionDescriptorLookupError ex) {
3900 JCDiagnostic cause = ex.getDiagnostic();
3901 resultInfo.checkContext.report(that, cause);
3902 result = that.type = types.createErrorType(pt());
3903 return;
3904 }
3905 }
3906 //where
3907 ResultInfo memberReferenceQualifierResult(JCMemberReference tree) {
3908 //if this is a constructor reference, the expected kind must be a type
3909 return new ResultInfo(tree.getMode() == ReferenceMode.INVOKE ?
3910 KindSelector.VAL_TYP : KindSelector.TYP,
3911 Type.noType);
3912 }
3913
3914
3915 @SuppressWarnings("fallthrough")
3916 void checkReferenceCompatible(JCMemberReference tree, Type descriptor, Type refType, CheckContext checkContext, boolean speculativeAttr) {
3917 InferenceContext inferenceContext = checkContext.inferenceContext();
3918 Type returnType = inferenceContext.asUndetVar(descriptor.getReturnType());
3919
3920 Type resType;
3921 switch (tree.getMode()) {
3922 case NEW:
3923 if (!tree.expr.type.isRaw()) {
3924 resType = tree.expr.type;
3925 break;
3926 }
3927 default:
3928 resType = refType.getReturnType();
3929 }
3930
3931 Type incompatibleReturnType = resType;
3932
3933 if (returnType.hasTag(VOID)) {
3934 incompatibleReturnType = null;
3935 }
3936
3937 if (!returnType.hasTag(VOID) && !resType.hasTag(VOID)) {
3938 if (resType.isErroneous() ||
3939 new FunctionalReturnContext(checkContext).compatible(resType, returnType,
3940 checkContext.checkWarner(tree, resType, returnType))) {
3941 incompatibleReturnType = null;
3942 }
3943 }
3944
3945 if (incompatibleReturnType != null) {
3946 Fragment msg =
3947 Fragments.IncompatibleRetTypeInMref(Fragments.InconvertibleTypes(resType, descriptor.getReturnType()));
3948 checkContext.report(tree, diags.fragment(msg));
3949 } else {
3950 if (inferenceContext.free(refType)) {
3951 // we need to wait for inference to finish and then replace inference vars in the referent type
3952 inferenceContext.addFreeTypeListener(List.of(refType),
3953 instantiatedContext -> {
3954 tree.referentType = instantiatedContext.asInstType(refType);
3955 });
3956 } else {
3957 tree.referentType = refType;
3958 }
3959 }
3960
3961 if (!speculativeAttr) {
3962 if (!checkExConstraints(refType.getThrownTypes(), descriptor.getThrownTypes(), inferenceContext)) {
3963 log.error(tree, Errors.IncompatibleThrownTypesInMref(refType.getThrownTypes()));
3964 }
3965 }
3966 }
3967
3968 boolean checkExConstraints(
3969 List<Type> thrownByFuncExpr,
3970 List<Type> thrownAtFuncType,
3971 InferenceContext inferenceContext) {
3972 /** 18.2.5: Otherwise, let E1, ..., En be the types in the function type's throws clause that
3973 * are not proper types
3974 */
3975 List<Type> nonProperList = thrownAtFuncType.stream()
3976 .filter(e -> inferenceContext.free(e)).collect(List.collector());
3977 List<Type> properList = thrownAtFuncType.diff(nonProperList);
3978
3979 /** Let X1,...,Xm be the checked exception types that the lambda body can throw or
3980 * in the throws clause of the invocation type of the method reference's compile-time
3981 * declaration
3982 */
3983 List<Type> checkedList = thrownByFuncExpr.stream()
3984 .filter(e -> chk.isChecked(e)).collect(List.collector());
3985
3986 /** If n = 0 (the function type's throws clause consists only of proper types), then
3987 * if there exists some i (1 <= i <= m) such that Xi is not a subtype of any proper type
3988 * in the throws clause, the constraint reduces to false; otherwise, the constraint
3989 * reduces to true
3990 */
3991 ListBuffer<Type> uncaughtByProperTypes = new ListBuffer<>();
3992 for (Type checked : checkedList) {
3993 boolean isSubtype = false;
3994 for (Type proper : properList) {
3995 if (types.isSubtype(checked, proper)) {
3996 isSubtype = true;
3997 break;
3998 }
3999 }
4000 if (!isSubtype) {
4001 uncaughtByProperTypes.add(checked);
4002 }
4003 }
4004
4005 if (nonProperList.isEmpty() && !uncaughtByProperTypes.isEmpty()) {
4006 return false;
4007 }
4008
4009 /** If n > 0, the constraint reduces to a set of subtyping constraints:
4010 * for all i (1 <= i <= m), if Xi is not a subtype of any proper type in the
4011 * throws clause, then the constraints include, for all j (1 <= j <= n), <Xi <: Ej>
4012 */
4013 List<Type> nonProperAsUndet = inferenceContext.asUndetVars(nonProperList);
4014 uncaughtByProperTypes.forEach(checkedEx -> {
4015 nonProperAsUndet.forEach(nonProper -> {
4016 types.isSubtype(checkedEx, nonProper);
4017 });
4018 });
4019
4020 /** In addition, for all j (1 <= j <= n), the constraint reduces to the bound throws Ej
4021 */
4022 nonProperAsUndet.stream()
4023 .filter(t -> t.hasTag(UNDETVAR))
4024 .forEach(t -> ((UndetVar)t).setThrow());
4025 return true;
4026 }
4027
4028 /**
4029 * Set functional type info on the underlying AST. Note: as the target descriptor
4030 * might contain inference variables, we might need to register an hook in the
4031 * current inference context.
4032 */
4033 private void setFunctionalInfo(final Env<AttrContext> env, final JCFunctionalExpression fExpr,
4034 final Type pt, final Type descriptorType, final Type primaryTarget, final CheckContext checkContext) {
4035 if (checkContext.inferenceContext().free(descriptorType)) {
4036 checkContext.inferenceContext().addFreeTypeListener(List.of(pt, descriptorType),
4037 inferenceContext -> setFunctionalInfo(env, fExpr, pt, inferenceContext.asInstType(descriptorType),
4038 inferenceContext.asInstType(primaryTarget), checkContext));
4039 } else {
4040 if (pt.hasTag(CLASS)) {
4041 fExpr.target = primaryTarget;
4042 }
4043 if (checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
4044 pt != Type.recoveryType) {
4045 //check that functional interface class is well-formed
4046 try {
4047 /* Types.makeFunctionalInterfaceClass() may throw an exception
4048 * when it's executed post-inference. See the listener code
4049 * above.
4050 */
4051 ClassSymbol csym = types.makeFunctionalInterfaceClass(env,
4052 names.empty, fExpr.target, ABSTRACT);
4053 if (csym != null) {
4054 chk.checkImplementations(env.tree, csym, csym);
4055 try {
4056 //perform an additional functional interface check on the synthetic class,
4057 //as there may be spurious errors for raw targets - because of existing issues
4058 //with membership and inheritance (see JDK-8074570).
4059 csym.flags_field |= INTERFACE;
4060 types.findDescriptorType(csym.type);
4061 } catch (FunctionDescriptorLookupError err) {
4062 resultInfo.checkContext.report(fExpr,
4063 diags.fragment(Fragments.NoSuitableFunctionalIntfInst(fExpr.target)));
4064 }
4065 }
4066 } catch (Types.FunctionDescriptorLookupError ex) {
4067 JCDiagnostic cause = ex.getDiagnostic();
4068 resultInfo.checkContext.report(env.tree, cause);
4069 }
4070 }
4071 }
4072 }
4073
4074 public void visitParens(JCParens tree) {
4075 Type owntype = attribTree(tree.expr, env, resultInfo);
4076 result = check(tree, owntype, pkind(), resultInfo);
4077 Symbol sym = TreeInfo.symbol(tree);
4078 if (sym != null && sym.kind.matches(KindSelector.TYP_PCK) && sym.kind != Kind.ERR)
4079 log.error(tree.pos(), Errors.IllegalParenthesizedExpression);
4080 }
4081
4082 public void visitAssign(JCAssign tree) {
4083 Type owntype = attribTree(tree.lhs, env.dup(tree), varAssignmentInfo);
4084 Type capturedType = capture(owntype);
4085 attribExpr(tree.rhs, env, owntype);
4086 result = check(tree, capturedType, KindSelector.VAL, resultInfo);
4087 }
4088
4089 public void visitAssignop(JCAssignOp tree) {
4090 // Attribute arguments.
4091 Type owntype = attribTree(tree.lhs, env, varAssignmentInfo);
4092 Type operand = attribExpr(tree.rhs, env);
4093 // Find operator.
4094 Symbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag().noAssignOp(), owntype, operand);
4095 if (operator != operators.noOpSymbol &&
4096 !owntype.isErroneous() &&
4097 !operand.isErroneous()) {
4098 chk.checkDivZero(tree.rhs.pos(), operator, operand);
4099 chk.checkCastable(tree.rhs.pos(),
4100 operator.type.getReturnType(),
4101 owntype);
4102 chk.checkLossOfPrecision(tree.rhs.pos(), operand, owntype);
4103 }
4104 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4105 }
4106
4107 public void visitUnary(JCUnary tree) {
4108 // Attribute arguments.
4109 Type argtype = (tree.getTag().isIncOrDecUnaryOp())
4110 ? attribTree(tree.arg, env, varAssignmentInfo)
4111 : chk.checkNonVoid(tree.arg.pos(), attribExpr(tree.arg, env));
4112
4113 // Find operator.
4114 OperatorSymbol operator = tree.operator = operators.resolveUnary(tree, tree.getTag(), argtype);
4115 Type owntype = types.createErrorType(tree.type);
4116 if (operator != operators.noOpSymbol &&
4117 !argtype.isErroneous()) {
4118 owntype = (tree.getTag().isIncOrDecUnaryOp())
4119 ? tree.arg.type
4120 : operator.type.getReturnType();
4121 int opc = operator.opcode;
4122
4123 // If the argument is constant, fold it.
4124 if (argtype.constValue() != null) {
4125 Type ctype = cfolder.fold1(opc, argtype);
4126 if (ctype != null) {
4127 owntype = cfolder.coerce(ctype, owntype);
4128 }
4129 }
4130 }
4131 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4132 matchBindings = matchBindingsComputer.unary(tree, matchBindings);
4133 }
4134
4135 public void visitBinary(JCBinary tree) {
4136 // Attribute arguments.
4137 Type left = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.lhs, env));
4138 // x && y
4139 // include x's bindings when true in y
4140
4141 // x || y
4142 // include x's bindings when false in y
4143
4144 MatchBindings lhsBindings = matchBindings;
4145 List<BindingSymbol> propagatedBindings;
4146 switch (tree.getTag()) {
4147 case AND:
4148 propagatedBindings = lhsBindings.bindingsWhenTrue;
4149 break;
4150 case OR:
4151 propagatedBindings = lhsBindings.bindingsWhenFalse;
4152 break;
4153 default:
4154 propagatedBindings = List.nil();
4155 break;
4156 }
4157 Env<AttrContext> rhsEnv = bindingEnv(env, propagatedBindings);
4158 Type right;
4159 try {
4160 right = chk.checkNonVoid(tree.rhs.pos(), attribExpr(tree.rhs, rhsEnv));
4161 } finally {
4162 rhsEnv.info.scope.leave();
4163 }
4164
4165 matchBindings = matchBindingsComputer.binary(tree, lhsBindings, matchBindings);
4166
4167 // Find operator.
4168 OperatorSymbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag(), left, right);
4169 Type owntype = types.createErrorType(tree.type);
4170 if (operator != operators.noOpSymbol &&
4171 !left.isErroneous() &&
4172 !right.isErroneous()) {
4173 owntype = operator.type.getReturnType();
4174 int opc = operator.opcode;
4175 // If both arguments are constants, fold them.
4176 if (left.constValue() != null && right.constValue() != null) {
4177 Type ctype = cfolder.fold2(opc, left, right);
4178 if (ctype != null) {
4179 owntype = cfolder.coerce(ctype, owntype);
4180 }
4181 }
4182
4183 // Check that argument types of a reference ==, != are
4184 // castable to each other, (JLS 15.21). Note: unboxing
4185 // comparisons will not have an acmp* opc at this point.
4186 if ((opc == ByteCodes.if_acmpeq || opc == ByteCodes.if_acmpne)) {
4187 if (!types.isCastable(left, right, new Warner(tree.pos()))) {
4188 log.error(tree.pos(), Errors.IncomparableTypes(left, right));
4189 }
4190 }
4191
4192 chk.checkDivZero(tree.rhs.pos(), operator, right);
4193 }
4194 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4195 }
4196
4197 public void visitTypeCast(final JCTypeCast tree) {
4198 Type clazztype = attribType(tree.clazz, env);
4199 chk.validate(tree.clazz, env, false);
4200 //a fresh environment is required for 292 inference to work properly ---
4201 //see Infer.instantiatePolymorphicSignatureInstance()
4202 Env<AttrContext> localEnv = env.dup(tree);
4203 //should we propagate the target type?
4204 final ResultInfo castInfo;
4205 JCExpression expr = TreeInfo.skipParens(tree.expr);
4206 boolean isPoly = (expr.hasTag(LAMBDA) || expr.hasTag(REFERENCE));
4207 if (isPoly) {
4208 //expression is a poly - we need to propagate target type info
4209 castInfo = new ResultInfo(KindSelector.VAL, clazztype,
4210 new Check.NestedCheckContext(resultInfo.checkContext) {
4211 @Override
4212 public boolean compatible(Type found, Type req, Warner warn) {
4213 return types.isCastable(found, req, warn);
4214 }
4215 });
4216 } else {
4217 //standalone cast - target-type info is not propagated
4218 castInfo = unknownExprInfo;
4219 }
4220 Type exprtype = attribTree(tree.expr, localEnv, castInfo);
4221 Type owntype = isPoly ? clazztype : chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
4222 if (exprtype.constValue() != null)
4223 owntype = cfolder.coerce(exprtype, owntype);
4224 result = check(tree, capture(owntype), KindSelector.VAL, resultInfo);
4225 if (!isPoly)
4226 chk.checkRedundantCast(localEnv, tree);
4227 }
4228
4229 public void visitTypeTest(JCInstanceOf tree) {
4230 Type exprtype = attribExpr(tree.expr, env);
4231 if (exprtype.isPrimitive()) {
4232 preview.checkSourceLevel(tree.expr.pos(), Feature.PRIMITIVE_PATTERNS);
4233 } else {
4234 exprtype = chk.checkNullOrRefType(
4235 tree.expr.pos(), exprtype);
4236 }
4237 Type clazztype;
4238 JCTree typeTree;
4239 if (tree.pattern.getTag() == BINDINGPATTERN ||
4240 tree.pattern.getTag() == RECORDPATTERN) {
4241 attribExpr(tree.pattern, env, exprtype);
4242 clazztype = tree.pattern.type;
4243 if (types.isSubtype(exprtype, clazztype) &&
4244 !exprtype.isErroneous() && !clazztype.isErroneous() &&
4245 tree.pattern.getTag() != RECORDPATTERN) {
4246 if (!allowUnconditionalPatternsInstanceOf) {
4247 log.error(DiagnosticFlag.SOURCE_LEVEL, tree.pos(),
4248 Feature.UNCONDITIONAL_PATTERN_IN_INSTANCEOF.error(this.sourceName));
4249 }
4250 }
4251 typeTree = TreeInfo.primaryPatternTypeTree((JCPattern) tree.pattern);
4252 } else {
4253 clazztype = attribType(tree.pattern, env);
4254 typeTree = tree.pattern;
4255 chk.validate(typeTree, env, false);
4256 }
4257 if (clazztype.isPrimitive()) {
4258 preview.checkSourceLevel(tree.pattern.pos(), Feature.PRIMITIVE_PATTERNS);
4259 } else {
4260 if (!clazztype.hasTag(TYPEVAR)) {
4261 clazztype = chk.checkClassOrArrayType(typeTree.pos(), clazztype);
4262 }
4263 if (!clazztype.isErroneous() && !types.isReifiable(clazztype)) {
4264 boolean valid = false;
4265 if (allowReifiableTypesInInstanceof) {
4266 valid = checkCastablePattern(tree.expr.pos(), exprtype, clazztype);
4267 } else {
4268 log.error(DiagnosticFlag.SOURCE_LEVEL, tree.pos(),
4269 Feature.REIFIABLE_TYPES_INSTANCEOF.error(this.sourceName));
4270 allowReifiableTypesInInstanceof = true;
4271 }
4272 if (!valid) {
4273 clazztype = types.createErrorType(clazztype);
4274 }
4275 }
4276 }
4277 chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
4278 result = check(tree, syms.booleanType, KindSelector.VAL, resultInfo);
4279 }
4280
4281 private boolean checkCastablePattern(DiagnosticPosition pos,
4282 Type exprType,
4283 Type pattType) {
4284 Warner warner = new Warner();
4285 // if any type is erroneous, the problem is reported elsewhere
4286 if (exprType.isErroneous() || pattType.isErroneous()) {
4287 return false;
4288 }
4289 if (!types.isCastable(exprType, pattType, warner)) {
4290 chk.basicHandler.report(pos,
4291 diags.fragment(Fragments.InconvertibleTypes(exprType, pattType)));
4292 return false;
4293 } else if ((exprType.isPrimitive() || pattType.isPrimitive()) &&
4294 (!exprType.isPrimitive() || !pattType.isPrimitive() || !types.isSameType(exprType, pattType))) {
4295 preview.checkSourceLevel(pos, Feature.PRIMITIVE_PATTERNS);
4296 return true;
4297 } else if (warner.hasLint(LintCategory.UNCHECKED)) {
4298 log.error(pos,
4299 Errors.InstanceofReifiableNotSafe(exprType, pattType));
4300 return false;
4301 } else {
4302 return true;
4303 }
4304 }
4305
4306 @Override
4307 public void visitAnyPattern(JCAnyPattern tree) {
4308 result = tree.type = resultInfo.pt;
4309 }
4310
4311 public void visitBindingPattern(JCBindingPattern tree) {
4312 Type type;
4313 if (tree.var.vartype != null) {
4314 type = attribType(tree.var.vartype, env);
4315 } else {
4316 type = resultInfo.pt;
4317 }
4318 tree.type = tree.var.type = type;
4319 BindingSymbol v = new BindingSymbol(tree.var.mods.flags, tree.var.name, type, env.info.scope.owner);
4320 v.pos = tree.pos;
4321 tree.var.sym = v;
4322 if (chk.checkUnique(tree.var.pos(), v, env.info.scope)) {
4323 chk.checkTransparentVar(tree.var.pos(), v, env.info.scope);
4324 }
4325 annotate.annotateLater(tree.var.mods.annotations, env, v, tree.pos());
4326 if (!tree.var.isImplicitlyTyped()) {
4327 annotate.queueScanTreeAndTypeAnnotate(tree.var.vartype, env, v, tree.var.pos());
4328 }
4329 annotate.flush();
4330 chk.validate(tree.var.vartype, env, true);
4331 result = tree.type;
4332 if (v.isUnnamedVariable()) {
4333 matchBindings = MatchBindingsComputer.EMPTY;
4334 } else {
4335 matchBindings = new MatchBindings(List.of(v), List.nil());
4336 }
4337 }
4338
4339 @Override
4340 public void visitRecordPattern(JCRecordPattern tree) {
4341 Type site;
4342
4343 if (tree.deconstructor == null) {
4344 log.error(tree.pos(), Errors.DeconstructionPatternVarNotAllowed);
4345 tree.record = syms.errSymbol;
4346 site = tree.type = types.createErrorType(tree.record.type);
4347 } else {
4348 Type type = attribType(tree.deconstructor, env);
4349 if (type.isRaw() && type.tsym.getTypeParameters().nonEmpty()) {
4350 Type inferred = infer.instantiatePatternType(resultInfo.pt, type.tsym);
4351 if (inferred == null) {
4352 log.error(tree.pos(), Errors.PatternTypeCannotInfer);
4353 } else {
4354 type = inferred;
4355 }
4356 }
4357 tree.type = tree.deconstructor.type = type;
4358 site = types.capture(tree.type);
4359 }
4360
4361 List<Type> expectedRecordTypes;
4362 if (site.tsym.kind == Kind.TYP && ((ClassSymbol) site.tsym).isRecord()) {
4363 ClassSymbol record = (ClassSymbol) site.tsym;
4364 expectedRecordTypes = record.getRecordComponents()
4365 .stream()
4366 .map(rc -> types.memberType(site, rc))
4367 .map(t -> types.upward(t, types.captures(t)).baseType())
4368 .collect(List.collector());
4369 tree.record = record;
4370 } else {
4371 log.error(tree.pos(), Errors.DeconstructionPatternOnlyRecords(site.tsym));
4372 expectedRecordTypes = Stream.generate(() -> types.createErrorType(tree.type))
4373 .limit(tree.nested.size())
4374 .collect(List.collector());
4375 tree.record = syms.errSymbol;
4376 }
4377 ListBuffer<BindingSymbol> outBindings = new ListBuffer<>();
4378 List<Type> recordTypes = expectedRecordTypes;
4379 List<JCPattern> nestedPatterns = tree.nested;
4380 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
4381 try {
4382 while (recordTypes.nonEmpty() && nestedPatterns.nonEmpty()) {
4383 attribExpr(nestedPatterns.head, localEnv, recordTypes.head);
4384 checkCastablePattern(nestedPatterns.head.pos(), recordTypes.head, nestedPatterns.head.type);
4385 outBindings.addAll(matchBindings.bindingsWhenTrue);
4386 matchBindings.bindingsWhenTrue.forEach(localEnv.info.scope::enter);
4387 nestedPatterns = nestedPatterns.tail;
4388 recordTypes = recordTypes.tail;
4389 }
4390 if (recordTypes.nonEmpty() || nestedPatterns.nonEmpty()) {
4391 while (nestedPatterns.nonEmpty()) {
4392 attribExpr(nestedPatterns.head, localEnv, Type.noType);
4393 nestedPatterns = nestedPatterns.tail;
4394 }
4395 List<Type> nestedTypes =
4396 tree.nested.stream().map(p -> p.type).collect(List.collector());
4397 log.error(tree.pos(),
4398 Errors.IncorrectNumberOfNestedPatterns(expectedRecordTypes,
4399 nestedTypes));
4400 }
4401 } finally {
4402 localEnv.info.scope.leave();
4403 }
4404 chk.validate(tree.deconstructor, env, true);
4405 result = tree.type;
4406 matchBindings = new MatchBindings(outBindings.toList(), List.nil());
4407 }
4408
4409 public void visitIndexed(JCArrayAccess tree) {
4410 Type owntype = types.createErrorType(tree.type);
4411 Type atype = attribExpr(tree.indexed, env);
4412 attribExpr(tree.index, env, syms.intType);
4413 if (types.isArray(atype))
4414 owntype = types.elemtype(atype);
4415 else if (!atype.hasTag(ERROR))
4416 log.error(tree.pos(), Errors.ArrayReqButFound(atype));
4417 if (!pkind().contains(KindSelector.VAL))
4418 owntype = capture(owntype);
4419 result = check(tree, owntype, KindSelector.VAR, resultInfo);
4420 }
4421
4422 public void visitIdent(JCIdent tree) {
4423 Symbol sym;
4424
4425 // Find symbol
4426 if (pt().hasTag(METHOD) || pt().hasTag(FORALL)) {
4427 // If we are looking for a method, the prototype `pt' will be a
4428 // method type with the type of the call's arguments as parameters.
4429 env.info.pendingResolutionPhase = null;
4430 sym = rs.resolveMethod(tree.pos(), env, tree.name, pt().getParameterTypes(), pt().getTypeArguments());
4431 } else if (tree.sym != null && tree.sym.kind != VAR) {
4432 sym = tree.sym;
4433 } else {
4434 sym = rs.resolveIdent(tree.pos(), env, tree.name, pkind());
4435 }
4436 tree.sym = sym;
4437
4438 // Also find the environment current for the class where
4439 // sym is defined (`symEnv').
4440 Env<AttrContext> symEnv = env;
4441 if (env.enclClass.sym.owner.kind != PCK && // we are in an inner class
4442 sym.kind.matches(KindSelector.VAL_MTH) &&
4443 sym.owner.kind == TYP &&
4444 tree.name != names._this && tree.name != names._super) {
4445
4446 // Find environment in which identifier is defined.
4447 while (symEnv.outer != null &&
4448 !sym.isMemberOf(symEnv.enclClass.sym, types)) {
4449 symEnv = symEnv.outer;
4450 }
4451 }
4452
4453 // If symbol is a variable, ...
4454 if (sym.kind == VAR) {
4455 VarSymbol v = (VarSymbol)sym;
4456
4457 // ..., evaluate its initializer, if it has one, and check for
4458 // illegal forward reference.
4459 checkInit(tree, env, v, false);
4460
4461 // If we are expecting a variable (as opposed to a value), check
4462 // that the variable is assignable in the current environment.
4463 if (KindSelector.ASG.subset(pkind()))
4464 checkAssignable(tree.pos(), v, null, env);
4465 }
4466
4467 Env<AttrContext> env1 = env;
4468 if (sym.kind != ERR && sym.kind != TYP &&
4469 sym.owner != null && sym.owner != env1.enclClass.sym) {
4470 // If the found symbol is inaccessible, then it is
4471 // accessed through an enclosing instance. Locate this
4472 // enclosing instance:
4473 while (env1.outer != null && !rs.isAccessible(env, env1.enclClass.sym.type, sym))
4474 env1 = env1.outer;
4475 }
4476
4477 if (env.info.isSerializable) {
4478 chk.checkAccessFromSerializableElement(tree, env.info.isSerializableLambda);
4479 }
4480
4481 result = checkId(tree, env1.enclClass.sym.type, sym, env, resultInfo);
4482 }
4483
4484 public void visitSelect(JCFieldAccess tree) {
4485 // Determine the expected kind of the qualifier expression.
4486 KindSelector skind = KindSelector.NIL;
4487 if (tree.name == names._this || tree.name == names._super ||
4488 tree.name == names._class)
4489 {
4490 skind = KindSelector.TYP;
4491 } else {
4492 if (pkind().contains(KindSelector.PCK))
4493 skind = KindSelector.of(skind, KindSelector.PCK);
4494 if (pkind().contains(KindSelector.TYP))
4495 skind = KindSelector.of(skind, KindSelector.TYP, KindSelector.PCK);
4496 if (pkind().contains(KindSelector.VAL_MTH))
4497 skind = KindSelector.of(skind, KindSelector.VAL, KindSelector.TYP);
4498 }
4499
4500 // Attribute the qualifier expression, and determine its symbol (if any).
4501 Type site = attribTree(tree.selected, env, new ResultInfo(skind, Type.noType));
4502 if (!pkind().contains(KindSelector.TYP_PCK))
4503 site = capture(site); // Capture field access
4504
4505 // don't allow T.class T[].class, etc
4506 if (skind == KindSelector.TYP) {
4507 Type elt = site;
4508 while (elt.hasTag(ARRAY))
4509 elt = ((ArrayType)elt).elemtype;
4510 if (elt.hasTag(TYPEVAR)) {
4511 log.error(tree.pos(), Errors.TypeVarCantBeDeref);
4512 result = tree.type = types.createErrorType(tree.name, site.tsym, site);
4513 tree.sym = tree.type.tsym;
4514 return ;
4515 }
4516 }
4517
4518 // If qualifier symbol is a type or `super', assert `selectSuper'
4519 // for the selection. This is relevant for determining whether
4520 // protected symbols are accessible.
4521 Symbol sitesym = TreeInfo.symbol(tree.selected);
4522 boolean selectSuperPrev = env.info.selectSuper;
4523 env.info.selectSuper =
4524 sitesym != null &&
4525 sitesym.name == names._super;
4526
4527 // Determine the symbol represented by the selection.
4528 env.info.pendingResolutionPhase = null;
4529 Symbol sym = selectSym(tree, sitesym, site, env, resultInfo);
4530 if (sym.kind == VAR && sym.name != names._super && env.info.defaultSuperCallSite != null) {
4531 log.error(tree.selected.pos(), Errors.NotEnclClass(site.tsym));
4532 sym = syms.errSymbol;
4533 }
4534 if (sym.exists() && !isType(sym) && pkind().contains(KindSelector.TYP_PCK)) {
4535 site = capture(site);
4536 sym = selectSym(tree, sitesym, site, env, resultInfo);
4537 }
4538 boolean varArgs = env.info.lastResolveVarargs();
4539 tree.sym = sym;
4540
4541 if (site.hasTag(TYPEVAR) && !isType(sym) && sym.kind != ERR) {
4542 site = types.skipTypeVars(site, true);
4543 }
4544
4545 // If that symbol is a variable, ...
4546 if (sym.kind == VAR) {
4547 VarSymbol v = (VarSymbol)sym;
4548
4549 // ..., evaluate its initializer, if it has one, and check for
4550 // illegal forward reference.
4551 checkInit(tree, env, v, true);
4552
4553 // If we are expecting a variable (as opposed to a value), check
4554 // that the variable is assignable in the current environment.
4555 if (KindSelector.ASG.subset(pkind()))
4556 checkAssignable(tree.pos(), v, tree.selected, env);
4557 }
4558
4559 if (sitesym != null &&
4560 sitesym.kind == VAR &&
4561 ((VarSymbol)sitesym).isResourceVariable() &&
4562 sym.kind == MTH &&
4563 sym.name.equals(names.close) &&
4564 sym.overrides(syms.autoCloseableClose, sitesym.type.tsym, types, true) &&
4565 env.info.lint.isEnabled(LintCategory.TRY)) {
4566 log.warning(LintCategory.TRY, tree, Warnings.TryExplicitCloseCall);
4567 }
4568
4569 // Disallow selecting a type from an expression
4570 if (isType(sym) && (sitesym == null || !sitesym.kind.matches(KindSelector.TYP_PCK))) {
4571 tree.type = check(tree.selected, pt(),
4572 sitesym == null ?
4573 KindSelector.VAL : sitesym.kind.toSelector(),
4574 new ResultInfo(KindSelector.TYP_PCK, pt()));
4575 }
4576
4577 if (isType(sitesym)) {
4578 if (sym.name != names._this && sym.name != names._super) {
4579 // Check if type-qualified fields or methods are static (JLS)
4580 if ((sym.flags() & STATIC) == 0 &&
4581 sym.name != names._super &&
4582 (sym.kind == VAR || sym.kind == MTH)) {
4583 rs.accessBase(rs.new StaticError(sym),
4584 tree.pos(), site, sym.name, true);
4585 }
4586 }
4587 } else if (sym.kind != ERR &&
4588 (sym.flags() & STATIC) != 0 &&
4589 sym.name != names._class) {
4590 // If the qualified item is not a type and the selected item is static, report
4591 // a warning. Make allowance for the class of an array type e.g. Object[].class)
4592 if (!sym.owner.isAnonymous()) {
4593 chk.warnStatic(tree, Warnings.StaticNotQualifiedByType(sym.kind.kindName(), sym.owner));
4594 } else {
4595 chk.warnStatic(tree, Warnings.StaticNotQualifiedByType2(sym.kind.kindName()));
4596 }
4597 }
4598
4599 // If we are selecting an instance member via a `super', ...
4600 if (env.info.selectSuper && (sym.flags() & STATIC) == 0) {
4601
4602 // Check that super-qualified symbols are not abstract (JLS)
4603 rs.checkNonAbstract(tree.pos(), sym);
4604
4605 if (site.isRaw()) {
4606 // Determine argument types for site.
4607 Type site1 = types.asSuper(env.enclClass.sym.type, site.tsym);
4608 if (site1 != null) site = site1;
4609 }
4610 }
4611
4612 if (env.info.isSerializable) {
4613 chk.checkAccessFromSerializableElement(tree, env.info.isSerializableLambda);
4614 }
4615
4616 env.info.selectSuper = selectSuperPrev;
4617 result = checkId(tree, site, sym, env, resultInfo);
4618 }
4619 //where
4620 /** Determine symbol referenced by a Select expression,
4621 *
4622 * @param tree The select tree.
4623 * @param site The type of the selected expression,
4624 * @param env The current environment.
4625 * @param resultInfo The current result.
4626 */
4627 private Symbol selectSym(JCFieldAccess tree,
4628 Symbol location,
4629 Type site,
4630 Env<AttrContext> env,
4631 ResultInfo resultInfo) {
4632 DiagnosticPosition pos = tree.pos();
4633 Name name = tree.name;
4634 switch (site.getTag()) {
4635 case PACKAGE:
4636 return rs.accessBase(
4637 rs.findIdentInPackage(pos, env, site.tsym, name, resultInfo.pkind),
4638 pos, location, site, name, true);
4639 case ARRAY:
4640 case CLASS:
4641 if (resultInfo.pt.hasTag(METHOD) || resultInfo.pt.hasTag(FORALL)) {
4642 return rs.resolveQualifiedMethod(
4643 pos, env, location, site, name, resultInfo.pt.getParameterTypes(), resultInfo.pt.getTypeArguments());
4644 } else if (name == names._this || name == names._super) {
4645 return rs.resolveSelf(pos, env, site.tsym, name);
4646 } else if (name == names._class) {
4647 // In this case, we have already made sure in
4648 // visitSelect that qualifier expression is a type.
4649 return syms.getClassField(site, types);
4650 } else {
4651 // We are seeing a plain identifier as selector.
4652 Symbol sym = rs.findIdentInType(pos, env, site, name, resultInfo.pkind);
4653 sym = rs.accessBase(sym, pos, location, site, name, true);
4654 return sym;
4655 }
4656 case WILDCARD:
4657 throw new AssertionError(tree);
4658 case TYPEVAR:
4659 // Normally, site.getUpperBound() shouldn't be null.
4660 // It should only happen during memberEnter/attribBase
4661 // when determining the supertype which *must* be
4662 // done before attributing the type variables. In
4663 // other words, we are seeing this illegal program:
4664 // class B<T> extends A<T.foo> {}
4665 Symbol sym = (site.getUpperBound() != null)
4666 ? selectSym(tree, location, capture(site.getUpperBound()), env, resultInfo)
4667 : null;
4668 if (sym == null) {
4669 log.error(pos, Errors.TypeVarCantBeDeref);
4670 return syms.errSymbol;
4671 } else {
4672 Symbol sym2 = (sym.flags() & Flags.PRIVATE) != 0 ?
4673 rs.new AccessError(env, site, sym) :
4674 sym;
4675 rs.accessBase(sym2, pos, location, site, name, true);
4676 return sym;
4677 }
4678 case ERROR:
4679 // preserve identifier names through errors
4680 return types.createErrorType(name, site.tsym, site).tsym;
4681 default:
4682 // The qualifier expression is of a primitive type -- only
4683 // .class is allowed for these.
4684 if (name == names._class) {
4685 // In this case, we have already made sure in Select that
4686 // qualifier expression is a type.
4687 return syms.getClassField(site, types);
4688 } else {
4689 log.error(pos, Errors.CantDeref(site));
4690 return syms.errSymbol;
4691 }
4692 }
4693 }
4694
4695 /** Determine type of identifier or select expression and check that
4696 * (1) the referenced symbol is not deprecated
4697 * (2) the symbol's type is safe (@see checkSafe)
4698 * (3) if symbol is a variable, check that its type and kind are
4699 * compatible with the prototype and protokind.
4700 * (4) if symbol is an instance field of a raw type,
4701 * which is being assigned to, issue an unchecked warning if its
4702 * type changes under erasure.
4703 * (5) if symbol is an instance method of a raw type, issue an
4704 * unchecked warning if its argument types change under erasure.
4705 * If checks succeed:
4706 * If symbol is a constant, return its constant type
4707 * else if symbol is a method, return its result type
4708 * otherwise return its type.
4709 * Otherwise return errType.
4710 *
4711 * @param tree The syntax tree representing the identifier
4712 * @param site If this is a select, the type of the selected
4713 * expression, otherwise the type of the current class.
4714 * @param sym The symbol representing the identifier.
4715 * @param env The current environment.
4716 * @param resultInfo The expected result
4717 */
4718 Type checkId(JCTree tree,
4719 Type site,
4720 Symbol sym,
4721 Env<AttrContext> env,
4722 ResultInfo resultInfo) {
4723 return (resultInfo.pt.hasTag(FORALL) || resultInfo.pt.hasTag(METHOD)) ?
4724 checkMethodIdInternal(tree, site, sym, env, resultInfo) :
4725 checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
4726 }
4727
4728 Type checkMethodIdInternal(JCTree tree,
4729 Type site,
4730 Symbol sym,
4731 Env<AttrContext> env,
4732 ResultInfo resultInfo) {
4733 if (resultInfo.pkind.contains(KindSelector.POLY)) {
4734 return attrRecover.recoverMethodInvocation(tree, site, sym, env, resultInfo);
4735 } else {
4736 return checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
4737 }
4738 }
4739
4740 Type checkIdInternal(JCTree tree,
4741 Type site,
4742 Symbol sym,
4743 Type pt,
4744 Env<AttrContext> env,
4745 ResultInfo resultInfo) {
4746 if (pt.isErroneous()) {
4747 return types.createErrorType(site);
4748 }
4749 Type owntype; // The computed type of this identifier occurrence.
4750 switch (sym.kind) {
4751 case TYP:
4752 // For types, the computed type equals the symbol's type,
4753 // except for two situations:
4754 owntype = sym.type;
4755 if (owntype.hasTag(CLASS)) {
4756 chk.checkForBadAuxiliaryClassAccess(tree.pos(), env, (ClassSymbol)sym);
4757 Type ownOuter = owntype.getEnclosingType();
4758
4759 // (a) If the symbol's type is parameterized, erase it
4760 // because no type parameters were given.
4761 // We recover generic outer type later in visitTypeApply.
4762 if (owntype.tsym.type.getTypeArguments().nonEmpty()) {
4763 owntype = types.erasure(owntype);
4764 }
4765
4766 // (b) If the symbol's type is an inner class, then
4767 // we have to interpret its outer type as a superclass
4768 // of the site type. Example:
4769 //
4770 // class Tree<A> { class Visitor { ... } }
4771 // class PointTree extends Tree<Point> { ... }
4772 // ...PointTree.Visitor...
4773 //
4774 // Then the type of the last expression above is
4775 // Tree<Point>.Visitor.
4776 else if (ownOuter.hasTag(CLASS) && site != ownOuter) {
4777 Type normOuter = site;
4778 if (normOuter.hasTag(CLASS)) {
4779 normOuter = types.asEnclosingSuper(site, ownOuter.tsym);
4780 }
4781 if (normOuter == null) // perhaps from an import
4782 normOuter = types.erasure(ownOuter);
4783 if (normOuter != ownOuter)
4784 owntype = new ClassType(
4785 normOuter, List.nil(), owntype.tsym,
4786 owntype.getMetadata());
4787 }
4788 }
4789 break;
4790 case VAR:
4791 VarSymbol v = (VarSymbol)sym;
4792
4793 if (env.info.enclVar != null
4794 && v.type.hasTag(NONE)) {
4795 //self reference to implicitly typed variable declaration
4796 log.error(TreeInfo.positionFor(v, env.enclClass), Errors.CantInferLocalVarType(v.name, Fragments.LocalSelfRef));
4797 return tree.type = v.type = types.createErrorType(v.type);
4798 }
4799
4800 // Test (4): if symbol is an instance field of a raw type,
4801 // which is being assigned to, issue an unchecked warning if
4802 // its type changes under erasure.
4803 if (KindSelector.ASG.subset(pkind()) &&
4804 v.owner.kind == TYP &&
4805 (v.flags() & STATIC) == 0 &&
4806 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
4807 Type s = types.asOuterSuper(site, v.owner);
4808 if (s != null &&
4809 s.isRaw() &&
4810 !types.isSameType(v.type, v.erasure(types))) {
4811 chk.warnUnchecked(tree.pos(), Warnings.UncheckedAssignToVar(v, s));
4812 }
4813 }
4814 // The computed type of a variable is the type of the
4815 // variable symbol, taken as a member of the site type.
4816 owntype = (sym.owner.kind == TYP &&
4817 sym.name != names._this && sym.name != names._super)
4818 ? types.memberType(site, sym)
4819 : sym.type;
4820
4821 // If the variable is a constant, record constant value in
4822 // computed type.
4823 if (v.getConstValue() != null && isStaticReference(tree))
4824 owntype = owntype.constType(v.getConstValue());
4825
4826 if (resultInfo.pkind == KindSelector.VAL) {
4827 owntype = capture(owntype); // capture "names as expressions"
4828 }
4829 break;
4830 case MTH: {
4831 owntype = checkMethod(site, sym,
4832 new ResultInfo(resultInfo.pkind, resultInfo.pt.getReturnType(), resultInfo.checkContext, resultInfo.checkMode),
4833 env, TreeInfo.args(env.tree), resultInfo.pt.getParameterTypes(),
4834 resultInfo.pt.getTypeArguments());
4835 chk.checkRestricted(tree.pos(), sym);
4836 break;
4837 }
4838 case PCK: case ERR:
4839 owntype = sym.type;
4840 break;
4841 default:
4842 throw new AssertionError("unexpected kind: " + sym.kind +
4843 " in tree " + tree);
4844 }
4845
4846 // Emit a `deprecation' warning if symbol is deprecated.
4847 // (for constructors (but not for constructor references), the error
4848 // was given when the constructor was resolved)
4849
4850 if (sym.name != names.init || tree.hasTag(REFERENCE)) {
4851 chk.checkDeprecated(tree.pos(), env.info.scope.owner, sym);
4852 chk.checkSunAPI(tree.pos(), sym);
4853 chk.checkProfile(tree.pos(), sym);
4854 chk.checkPreview(tree.pos(), env.info.scope.owner, sym);
4855 }
4856
4857 // If symbol is a variable, check that its type and
4858 // kind are compatible with the prototype and protokind.
4859 return check(tree, owntype, sym.kind.toSelector(), resultInfo);
4860 }
4861
4862 /** Check that variable is initialized and evaluate the variable's
4863 * initializer, if not yet done. Also check that variable is not
4864 * referenced before it is defined.
4865 * @param tree The tree making up the variable reference.
4866 * @param env The current environment.
4867 * @param v The variable's symbol.
4868 */
4869 private void checkInit(JCTree tree,
4870 Env<AttrContext> env,
4871 VarSymbol v,
4872 boolean onlyWarning) {
4873 // A forward reference is diagnosed if the declaration position
4874 // of the variable is greater than the current tree position
4875 // and the tree and variable definition occur in the same class
4876 // definition. Note that writes don't count as references.
4877 // This check applies only to class and instance
4878 // variables. Local variables follow different scope rules,
4879 // and are subject to definite assignment checking.
4880 Env<AttrContext> initEnv = enclosingInitEnv(env);
4881 if (initEnv != null &&
4882 (initEnv.info.enclVar == v || v.pos > tree.pos) &&
4883 v.owner.kind == TYP &&
4884 v.owner == env.info.scope.owner.enclClass() &&
4885 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env) &&
4886 (!env.tree.hasTag(ASSIGN) ||
4887 TreeInfo.skipParens(((JCAssign) env.tree).lhs) != tree)) {
4888 if (!onlyWarning || isStaticEnumField(v)) {
4889 Error errkey = (initEnv.info.enclVar == v) ?
4890 Errors.IllegalSelfRef : Errors.IllegalForwardRef;
4891 log.error(tree.pos(), errkey);
4892 } else if (useBeforeDeclarationWarning) {
4893 Warning warnkey = (initEnv.info.enclVar == v) ?
4894 Warnings.SelfRef(v) : Warnings.ForwardRef(v);
4895 log.warning(tree.pos(), warnkey);
4896 }
4897 }
4898
4899 v.getConstValue(); // ensure initializer is evaluated
4900
4901 checkEnumInitializer(tree, env, v);
4902 }
4903
4904 /**
4905 * Returns the enclosing init environment associated with this env (if any). An init env
4906 * can be either a field declaration env or a static/instance initializer env.
4907 */
4908 Env<AttrContext> enclosingInitEnv(Env<AttrContext> env) {
4909 while (true) {
4910 switch (env.tree.getTag()) {
4911 case VARDEF:
4912 JCVariableDecl vdecl = (JCVariableDecl)env.tree;
4913 if (vdecl.sym.owner.kind == TYP) {
4914 //field
4915 return env;
4916 }
4917 break;
4918 case BLOCK:
4919 if (env.next.tree.hasTag(CLASSDEF)) {
4920 //instance/static initializer
4921 return env;
4922 }
4923 break;
4924 case METHODDEF:
4925 case CLASSDEF:
4926 case TOPLEVEL:
4927 return null;
4928 }
4929 Assert.checkNonNull(env.next);
4930 env = env.next;
4931 }
4932 }
4933
4934 /**
4935 * Check for illegal references to static members of enum. In
4936 * an enum type, constructors and initializers may not
4937 * reference its static members unless they are constant.
4938 *
4939 * @param tree The tree making up the variable reference.
4940 * @param env The current environment.
4941 * @param v The variable's symbol.
4942 * @jls 8.9 Enum Types
4943 */
4944 private void checkEnumInitializer(JCTree tree, Env<AttrContext> env, VarSymbol v) {
4945 // JLS:
4946 //
4947 // "It is a compile-time error to reference a static field
4948 // of an enum type that is not a compile-time constant
4949 // (15.28) from constructors, instance initializer blocks,
4950 // or instance variable initializer expressions of that
4951 // type. It is a compile-time error for the constructors,
4952 // instance initializer blocks, or instance variable
4953 // initializer expressions of an enum constant e to refer
4954 // to itself or to an enum constant of the same type that
4955 // is declared to the right of e."
4956 if (isStaticEnumField(v)) {
4957 ClassSymbol enclClass = env.info.scope.owner.enclClass();
4958
4959 if (enclClass == null || enclClass.owner == null)
4960 return;
4961
4962 // See if the enclosing class is the enum (or a
4963 // subclass thereof) declaring v. If not, this
4964 // reference is OK.
4965 if (v.owner != enclClass && !types.isSubtype(enclClass.type, v.owner.type))
4966 return;
4967
4968 // If the reference isn't from an initializer, then
4969 // the reference is OK.
4970 if (!Resolve.isInitializer(env))
4971 return;
4972
4973 log.error(tree.pos(), Errors.IllegalEnumStaticRef);
4974 }
4975 }
4976
4977 /** Is the given symbol a static, non-constant field of an Enum?
4978 * Note: enum literals should not be regarded as such
4979 */
4980 private boolean isStaticEnumField(VarSymbol v) {
4981 return Flags.isEnum(v.owner) &&
4982 Flags.isStatic(v) &&
4983 !Flags.isConstant(v) &&
4984 v.name != names._class;
4985 }
4986
4987 /**
4988 * Check that method arguments conform to its instantiation.
4989 **/
4990 public Type checkMethod(Type site,
4991 final Symbol sym,
4992 ResultInfo resultInfo,
4993 Env<AttrContext> env,
4994 final List<JCExpression> argtrees,
4995 List<Type> argtypes,
4996 List<Type> typeargtypes) {
4997 // Test (5): if symbol is an instance method of a raw type, issue
4998 // an unchecked warning if its argument types change under erasure.
4999 if ((sym.flags() & STATIC) == 0 &&
5000 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
5001 Type s = types.asOuterSuper(site, sym.owner);
5002 if (s != null && s.isRaw() &&
5003 !types.isSameTypes(sym.type.getParameterTypes(),
5004 sym.erasure(types).getParameterTypes())) {
5005 chk.warnUnchecked(env.tree.pos(), Warnings.UncheckedCallMbrOfRawType(sym, s));
5006 }
5007 }
5008
5009 if (env.info.defaultSuperCallSite != null) {
5010 for (Type sup : types.interfaces(env.enclClass.type).prepend(types.supertype((env.enclClass.type)))) {
5011 if (!sup.tsym.isSubClass(sym.enclClass(), types) ||
5012 types.isSameType(sup, env.info.defaultSuperCallSite)) continue;
5013 List<MethodSymbol> icand_sup =
5014 types.interfaceCandidates(sup, (MethodSymbol)sym);
5015 if (icand_sup.nonEmpty() &&
5016 icand_sup.head != sym &&
5017 icand_sup.head.overrides(sym, icand_sup.head.enclClass(), types, true)) {
5018 log.error(env.tree.pos(),
5019 Errors.IllegalDefaultSuperCall(env.info.defaultSuperCallSite, Fragments.OverriddenDefault(sym, sup)));
5020 break;
5021 }
5022 }
5023 env.info.defaultSuperCallSite = null;
5024 }
5025
5026 if (sym.isStatic() && site.isInterface() && env.tree.hasTag(APPLY)) {
5027 JCMethodInvocation app = (JCMethodInvocation)env.tree;
5028 if (app.meth.hasTag(SELECT) &&
5029 !TreeInfo.isStaticSelector(((JCFieldAccess)app.meth).selected, names)) {
5030 log.error(env.tree.pos(), Errors.IllegalStaticIntfMethCall(site));
5031 }
5032 }
5033
5034 // Compute the identifier's instantiated type.
5035 // For methods, we need to compute the instance type by
5036 // Resolve.instantiate from the symbol's type as well as
5037 // any type arguments and value arguments.
5038 Warner noteWarner = new Warner();
5039 try {
5040 Type owntype = rs.checkMethod(
5041 env,
5042 site,
5043 sym,
5044 resultInfo,
5045 argtypes,
5046 typeargtypes,
5047 noteWarner);
5048
5049 DeferredAttr.DeferredTypeMap<Void> checkDeferredMap =
5050 deferredAttr.new DeferredTypeMap<>(DeferredAttr.AttrMode.CHECK, sym, env.info.pendingResolutionPhase);
5051
5052 argtypes = argtypes.map(checkDeferredMap);
5053
5054 if (noteWarner.hasNonSilentLint(LintCategory.UNCHECKED)) {
5055 chk.warnUnchecked(env.tree.pos(), Warnings.UncheckedMethInvocationApplied(kindName(sym),
5056 sym.name,
5057 rs.methodArguments(sym.type.getParameterTypes()),
5058 rs.methodArguments(argtypes.map(checkDeferredMap)),
5059 kindName(sym.location()),
5060 sym.location()));
5061 if (resultInfo.pt != Infer.anyPoly ||
5062 !owntype.hasTag(METHOD) ||
5063 !owntype.isPartial()) {
5064 //if this is not a partially inferred method type, erase return type. Otherwise,
5065 //erasure is carried out in PartiallyInferredMethodType.check().
5066 owntype = new MethodType(owntype.getParameterTypes(),
5067 types.erasure(owntype.getReturnType()),
5068 types.erasure(owntype.getThrownTypes()),
5069 syms.methodClass);
5070 }
5071 }
5072
5073 PolyKind pkind = (sym.type.hasTag(FORALL) &&
5074 sym.type.getReturnType().containsAny(((ForAll)sym.type).tvars)) ?
5075 PolyKind.POLY : PolyKind.STANDALONE;
5076 TreeInfo.setPolyKind(env.tree, pkind);
5077
5078 return (resultInfo.pt == Infer.anyPoly) ?
5079 owntype :
5080 chk.checkMethod(owntype, sym, env, argtrees, argtypes, env.info.lastResolveVarargs(),
5081 resultInfo.checkContext.inferenceContext());
5082 } catch (Infer.InferenceException ex) {
5083 //invalid target type - propagate exception outwards or report error
5084 //depending on the current check context
5085 resultInfo.checkContext.report(env.tree.pos(), ex.getDiagnostic());
5086 return types.createErrorType(site);
5087 } catch (Resolve.InapplicableMethodException ex) {
5088 final JCDiagnostic diag = ex.getDiagnostic();
5089 Resolve.InapplicableSymbolError errSym = rs.new InapplicableSymbolError(null) {
5090 @Override
5091 protected Pair<Symbol, JCDiagnostic> errCandidate() {
5092 return new Pair<>(sym, diag);
5093 }
5094 };
5095 List<Type> argtypes2 = argtypes.map(
5096 rs.new ResolveDeferredRecoveryMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase));
5097 JCDiagnostic errDiag = errSym.getDiagnostic(JCDiagnostic.DiagnosticType.ERROR,
5098 env.tree, sym, site, sym.name, argtypes2, typeargtypes);
5099 log.report(errDiag);
5100 return types.createErrorType(site);
5101 }
5102 }
5103
5104 public void visitLiteral(JCLiteral tree) {
5105 result = check(tree, litType(tree.typetag).constType(tree.value),
5106 KindSelector.VAL, resultInfo);
5107 }
5108 //where
5109 /** Return the type of a literal with given type tag.
5110 */
5111 Type litType(TypeTag tag) {
5112 return (tag == CLASS) ? syms.stringType : syms.typeOfTag[tag.ordinal()];
5113 }
5114
5115 public void visitTypeIdent(JCPrimitiveTypeTree tree) {
5116 result = check(tree, syms.typeOfTag[tree.typetag.ordinal()], KindSelector.TYP, resultInfo);
5117 }
5118
5119 public void visitTypeArray(JCArrayTypeTree tree) {
5120 Type etype = attribType(tree.elemtype, env);
5121 Type type = new ArrayType(etype, syms.arrayClass);
5122 result = check(tree, type, KindSelector.TYP, resultInfo);
5123 }
5124
5125 /** Visitor method for parameterized types.
5126 * Bound checking is left until later, since types are attributed
5127 * before supertype structure is completely known
5128 */
5129 public void visitTypeApply(JCTypeApply tree) {
5130 Type owntype = types.createErrorType(tree.type);
5131
5132 // Attribute functor part of application and make sure it's a class.
5133 Type clazztype = chk.checkClassType(tree.clazz.pos(), attribType(tree.clazz, env));
5134
5135 // Attribute type parameters
5136 List<Type> actuals = attribTypes(tree.arguments, env);
5137
5138 if (clazztype.hasTag(CLASS)) {
5139 List<Type> formals = clazztype.tsym.type.getTypeArguments();
5140 if (actuals.isEmpty()) //diamond
5141 actuals = formals;
5142
5143 if (actuals.length() == formals.length()) {
5144 List<Type> a = actuals;
5145 List<Type> f = formals;
5146 while (a.nonEmpty()) {
5147 a.head = a.head.withTypeVar(f.head);
5148 a = a.tail;
5149 f = f.tail;
5150 }
5151 // Compute the proper generic outer
5152 Type clazzOuter = clazztype.getEnclosingType();
5153 if (clazzOuter.hasTag(CLASS)) {
5154 Type site;
5155 JCExpression clazz = TreeInfo.typeIn(tree.clazz);
5156 if (clazz.hasTag(IDENT)) {
5157 site = env.enclClass.sym.type;
5158 } else if (clazz.hasTag(SELECT)) {
5159 site = ((JCFieldAccess) clazz).selected.type;
5160 } else throw new AssertionError(""+tree);
5161 if (clazzOuter.hasTag(CLASS) && site != clazzOuter) {
5162 if (site.hasTag(CLASS))
5163 site = types.asOuterSuper(site, clazzOuter.tsym);
5164 if (site == null)
5165 site = types.erasure(clazzOuter);
5166 clazzOuter = site;
5167 }
5168 }
5169 owntype = new ClassType(clazzOuter, actuals, clazztype.tsym,
5170 clazztype.getMetadata());
5171 } else {
5172 if (formals.length() != 0) {
5173 log.error(tree.pos(),
5174 Errors.WrongNumberTypeArgs(Integer.toString(formals.length())));
5175 } else {
5176 log.error(tree.pos(), Errors.TypeDoesntTakeParams(clazztype.tsym));
5177 }
5178 owntype = types.createErrorType(tree.type);
5179 }
5180 }
5181 result = check(tree, owntype, KindSelector.TYP, resultInfo);
5182 }
5183
5184 public void visitTypeUnion(JCTypeUnion tree) {
5185 ListBuffer<Type> multicatchTypes = new ListBuffer<>();
5186 ListBuffer<Type> all_multicatchTypes = null; // lazy, only if needed
5187 for (JCExpression typeTree : tree.alternatives) {
5188 Type ctype = attribType(typeTree, env);
5189 ctype = chk.checkType(typeTree.pos(),
5190 chk.checkClassType(typeTree.pos(), ctype),
5191 syms.throwableType);
5192 if (!ctype.isErroneous()) {
5193 //check that alternatives of a union type are pairwise
5194 //unrelated w.r.t. subtyping
5195 if (chk.intersects(ctype, multicatchTypes.toList())) {
5196 for (Type t : multicatchTypes) {
5197 boolean sub = types.isSubtype(ctype, t);
5198 boolean sup = types.isSubtype(t, ctype);
5199 if (sub || sup) {
5200 //assume 'a' <: 'b'
5201 Type a = sub ? ctype : t;
5202 Type b = sub ? t : ctype;
5203 log.error(typeTree.pos(), Errors.MulticatchTypesMustBeDisjoint(a, b));
5204 }
5205 }
5206 }
5207 multicatchTypes.append(ctype);
5208 if (all_multicatchTypes != null)
5209 all_multicatchTypes.append(ctype);
5210 } else {
5211 if (all_multicatchTypes == null) {
5212 all_multicatchTypes = new ListBuffer<>();
5213 all_multicatchTypes.appendList(multicatchTypes);
5214 }
5215 all_multicatchTypes.append(ctype);
5216 }
5217 }
5218 Type t = check(tree, types.lub(multicatchTypes.toList()),
5219 KindSelector.TYP, resultInfo.dup(CheckMode.NO_TREE_UPDATE));
5220 if (t.hasTag(CLASS)) {
5221 List<Type> alternatives =
5222 ((all_multicatchTypes == null) ? multicatchTypes : all_multicatchTypes).toList();
5223 t = new UnionClassType((ClassType) t, alternatives);
5224 }
5225 tree.type = result = t;
5226 }
5227
5228 public void visitTypeIntersection(JCTypeIntersection tree) {
5229 attribTypes(tree.bounds, env);
5230 tree.type = result = checkIntersection(tree, tree.bounds);
5231 }
5232
5233 public void visitTypeParameter(JCTypeParameter tree) {
5234 TypeVar typeVar = (TypeVar) tree.type;
5235
5236 if (tree.annotations != null && tree.annotations.nonEmpty()) {
5237 annotate.annotateTypeParameterSecondStage(tree, tree.annotations);
5238 }
5239
5240 if (!typeVar.getUpperBound().isErroneous()) {
5241 //fixup type-parameter bound computed in 'attribTypeVariables'
5242 typeVar.setUpperBound(checkIntersection(tree, tree.bounds));
5243 }
5244 }
5245
5246 Type checkIntersection(JCTree tree, List<JCExpression> bounds) {
5247 Set<Symbol> boundSet = new HashSet<>();
5248 if (bounds.nonEmpty()) {
5249 // accept class or interface or typevar as first bound.
5250 bounds.head.type = checkBase(bounds.head.type, bounds.head, env, false, false, false);
5251 boundSet.add(types.erasure(bounds.head.type).tsym);
5252 if (bounds.head.type.isErroneous()) {
5253 return bounds.head.type;
5254 }
5255 else if (bounds.head.type.hasTag(TYPEVAR)) {
5256 // if first bound was a typevar, do not accept further bounds.
5257 if (bounds.tail.nonEmpty()) {
5258 log.error(bounds.tail.head.pos(),
5259 Errors.TypeVarMayNotBeFollowedByOtherBounds);
5260 return bounds.head.type;
5261 }
5262 } else {
5263 // if first bound was a class or interface, accept only interfaces
5264 // as further bounds.
5265 for (JCExpression bound : bounds.tail) {
5266 bound.type = checkBase(bound.type, bound, env, false, true, false);
5267 if (bound.type.isErroneous()) {
5268 bounds = List.of(bound);
5269 }
5270 else if (bound.type.hasTag(CLASS)) {
5271 chk.checkNotRepeated(bound.pos(), types.erasure(bound.type), boundSet);
5272 }
5273 }
5274 }
5275 }
5276
5277 if (bounds.length() == 0) {
5278 return syms.objectType;
5279 } else if (bounds.length() == 1) {
5280 return bounds.head.type;
5281 } else {
5282 Type owntype = types.makeIntersectionType(TreeInfo.types(bounds));
5283 // ... the variable's bound is a class type flagged COMPOUND
5284 // (see comment for TypeVar.bound).
5285 // In this case, generate a class tree that represents the
5286 // bound class, ...
5287 JCExpression extending;
5288 List<JCExpression> implementing;
5289 if (!bounds.head.type.isInterface()) {
5290 extending = bounds.head;
5291 implementing = bounds.tail;
5292 } else {
5293 extending = null;
5294 implementing = bounds;
5295 }
5296 JCClassDecl cd = make.at(tree).ClassDef(
5297 make.Modifiers(PUBLIC | ABSTRACT),
5298 names.empty, List.nil(),
5299 extending, implementing, List.nil());
5300
5301 ClassSymbol c = (ClassSymbol)owntype.tsym;
5302 Assert.check((c.flags() & COMPOUND) != 0);
5303 cd.sym = c;
5304 c.sourcefile = env.toplevel.sourcefile;
5305
5306 // ... and attribute the bound class
5307 c.flags_field |= UNATTRIBUTED;
5308 Env<AttrContext> cenv = enter.classEnv(cd, env);
5309 typeEnvs.put(c, cenv);
5310 attribClass(c);
5311 return owntype;
5312 }
5313 }
5314
5315 public void visitWildcard(JCWildcard tree) {
5316 //- System.err.println("visitWildcard("+tree+");");//DEBUG
5317 Type type = (tree.kind.kind == BoundKind.UNBOUND)
5318 ? syms.objectType
5319 : attribType(tree.inner, env);
5320 result = check(tree, new WildcardType(chk.checkRefType(tree.pos(), type),
5321 tree.kind.kind,
5322 syms.boundClass),
5323 KindSelector.TYP, resultInfo);
5324 }
5325
5326 public void visitAnnotation(JCAnnotation tree) {
5327 Assert.error("should be handled in annotate");
5328 }
5329
5330 @Override
5331 public void visitModifiers(JCModifiers tree) {
5332 //error recovery only:
5333 Assert.check(resultInfo.pkind == KindSelector.ERR);
5334
5335 attribAnnotationTypes(tree.annotations, env);
5336 }
5337
5338 public void visitAnnotatedType(JCAnnotatedType tree) {
5339 attribAnnotationTypes(tree.annotations, env);
5340 Type underlyingType = attribType(tree.underlyingType, env);
5341 Type annotatedType = underlyingType.preannotatedType();
5342
5343 if (!env.info.isNewClass)
5344 annotate.annotateTypeSecondStage(tree, tree.annotations, annotatedType);
5345 result = tree.type = annotatedType;
5346 }
5347
5348 public void visitErroneous(JCErroneous tree) {
5349 if (tree.errs != null) {
5350 Env<AttrContext> errEnv = env.dup(env.tree, env.info.dup());
5351 errEnv.info.returnResult = unknownExprInfo;
5352 for (JCTree err : tree.errs)
5353 attribTree(err, errEnv, new ResultInfo(KindSelector.ERR, pt()));
5354 }
5355 result = tree.type = syms.errType;
5356 }
5357
5358 /** Default visitor method for all other trees.
5359 */
5360 public void visitTree(JCTree tree) {
5361 throw new AssertionError();
5362 }
5363
5364 /**
5365 * Attribute an env for either a top level tree or class or module declaration.
5366 */
5367 public void attrib(Env<AttrContext> env) {
5368 switch (env.tree.getTag()) {
5369 case MODULEDEF:
5370 attribModule(env.tree.pos(), ((JCModuleDecl)env.tree).sym);
5371 break;
5372 case PACKAGEDEF:
5373 attribPackage(env.tree.pos(), ((JCPackageDecl) env.tree).packge);
5374 break;
5375 default:
5376 attribClass(env.tree.pos(), env.enclClass.sym);
5377 }
5378 }
5379
5380 public void attribPackage(DiagnosticPosition pos, PackageSymbol p) {
5381 try {
5382 annotate.flush();
5383 attribPackage(p);
5384 } catch (CompletionFailure ex) {
5385 chk.completionError(pos, ex);
5386 }
5387 }
5388
5389 void attribPackage(PackageSymbol p) {
5390 attribWithLint(p,
5391 env -> chk.checkDeprecatedAnnotation(((JCPackageDecl) env.tree).pid.pos(), p));
5392 }
5393
5394 public void attribModule(DiagnosticPosition pos, ModuleSymbol m) {
5395 try {
5396 annotate.flush();
5397 attribModule(m);
5398 } catch (CompletionFailure ex) {
5399 chk.completionError(pos, ex);
5400 }
5401 }
5402
5403 void attribModule(ModuleSymbol m) {
5404 attribWithLint(m, env -> attribStat(env.tree, env));
5405 }
5406
5407 private void attribWithLint(TypeSymbol sym, Consumer<Env<AttrContext>> attrib) {
5408 Env<AttrContext> env = typeEnvs.get(sym);
5409
5410 Env<AttrContext> lintEnv = env;
5411 while (lintEnv.info.lint == null)
5412 lintEnv = lintEnv.next;
5413
5414 Lint lint = lintEnv.info.lint.augment(sym);
5415
5416 Lint prevLint = chk.setLint(lint);
5417 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
5418
5419 try {
5420 deferredLintHandler.flush(env.tree.pos(), lint);
5421 attrib.accept(env);
5422 } finally {
5423 log.useSource(prev);
5424 chk.setLint(prevLint);
5425 }
5426 }
5427
5428 /** Main method: attribute class definition associated with given class symbol.
5429 * reporting completion failures at the given position.
5430 * @param pos The source position at which completion errors are to be
5431 * reported.
5432 * @param c The class symbol whose definition will be attributed.
5433 */
5434 public void attribClass(DiagnosticPosition pos, ClassSymbol c) {
5435 try {
5436 annotate.flush();
5437 attribClass(c);
5438 } catch (CompletionFailure ex) {
5439 chk.completionError(pos, ex);
5440 }
5441 }
5442
5443 /** Attribute class definition associated with given class symbol.
5444 * @param c The class symbol whose definition will be attributed.
5445 */
5446 void attribClass(ClassSymbol c) throws CompletionFailure {
5447 if (c.type.hasTag(ERROR)) return;
5448
5449 // Check for cycles in the inheritance graph, which can arise from
5450 // ill-formed class files.
5451 chk.checkNonCyclic(null, c.type);
5452
5453 Type st = types.supertype(c.type);
5454 if ((c.flags_field & Flags.COMPOUND) == 0 &&
5455 (c.flags_field & Flags.SUPER_OWNER_ATTRIBUTED) == 0) {
5456 // First, attribute superclass.
5457 if (st.hasTag(CLASS))
5458 attribClass((ClassSymbol)st.tsym);
5459
5460 // Next attribute owner, if it is a class.
5461 if (c.owner.kind == TYP && c.owner.type.hasTag(CLASS))
5462 attribClass((ClassSymbol)c.owner);
5463
5464 c.flags_field |= Flags.SUPER_OWNER_ATTRIBUTED;
5465 }
5466
5467 // The previous operations might have attributed the current class
5468 // if there was a cycle. So we test first whether the class is still
5469 // UNATTRIBUTED.
5470 if ((c.flags_field & UNATTRIBUTED) != 0) {
5471 c.flags_field &= ~UNATTRIBUTED;
5472
5473 // Get environment current at the point of class definition.
5474 Env<AttrContext> env = typeEnvs.get(c);
5475
5476 // The info.lint field in the envs stored in typeEnvs is deliberately uninitialized,
5477 // because the annotations were not available at the time the env was created. Therefore,
5478 // we look up the environment chain for the first enclosing environment for which the
5479 // lint value is set. Typically, this is the parent env, but might be further if there
5480 // are any envs created as a result of TypeParameter nodes.
5481 Env<AttrContext> lintEnv = env;
5482 while (lintEnv.info.lint == null)
5483 lintEnv = lintEnv.next;
5484
5485 // Having found the enclosing lint value, we can initialize the lint value for this class
5486 env.info.lint = lintEnv.info.lint.augment(c);
5487
5488 Lint prevLint = chk.setLint(env.info.lint);
5489 JavaFileObject prev = log.useSource(c.sourcefile);
5490 ResultInfo prevReturnRes = env.info.returnResult;
5491
5492 try {
5493 if (c.isSealed() &&
5494 !c.isEnum() &&
5495 !c.isPermittedExplicit &&
5496 c.getPermittedSubclasses().isEmpty()) {
5497 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.SealedClassMustHaveSubclasses);
5498 }
5499
5500 if (c.isSealed()) {
5501 Set<Symbol> permittedTypes = new HashSet<>();
5502 boolean sealedInUnnamed = c.packge().modle == syms.unnamedModule || c.packge().modle == syms.noModule;
5503 for (Type subType : c.getPermittedSubclasses()) {
5504 boolean isTypeVar = false;
5505 if (subType.getTag() == TYPEVAR) {
5506 isTypeVar = true; //error recovery
5507 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5508 Errors.InvalidPermitsClause(Fragments.IsATypeVariable(subType)));
5509 }
5510 if (subType.tsym.isAnonymous() && !c.isEnum()) {
5511 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree), Errors.LocalClassesCantExtendSealed(Fragments.Anonymous));
5512 }
5513 if (permittedTypes.contains(subType.tsym)) {
5514 DiagnosticPosition pos =
5515 env.enclClass.permitting.stream()
5516 .filter(permittedExpr -> TreeInfo.diagnosticPositionFor(subType.tsym, permittedExpr, true) != null)
5517 .limit(2).collect(List.collector()).get(1);
5518 log.error(pos, Errors.InvalidPermitsClause(Fragments.IsDuplicated(subType)));
5519 } else {
5520 permittedTypes.add(subType.tsym);
5521 }
5522 if (sealedInUnnamed) {
5523 if (subType.tsym.packge() != c.packge()) {
5524 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5525 Errors.ClassInUnnamedModuleCantExtendSealedInDiffPackage(c)
5526 );
5527 }
5528 } else if (subType.tsym.packge().modle != c.packge().modle) {
5529 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5530 Errors.ClassInModuleCantExtendSealedInDiffModule(c, c.packge().modle)
5531 );
5532 }
5533 if (subType.tsym == c.type.tsym || types.isSuperType(subType, c.type)) {
5534 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, ((JCClassDecl)env.tree).permitting),
5535 Errors.InvalidPermitsClause(
5536 subType.tsym == c.type.tsym ?
5537 Fragments.MustNotBeSameClass :
5538 Fragments.MustNotBeSupertype(subType)
5539 )
5540 );
5541 } else if (!isTypeVar) {
5542 boolean thisIsASuper = types.directSupertypes(subType)
5543 .stream()
5544 .anyMatch(d -> d.tsym == c);
5545 if (!thisIsASuper) {
5546 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5547 Errors.InvalidPermitsClause(Fragments.DoesntExtendSealed(subType)));
5548 }
5549 }
5550 }
5551 }
5552
5553 List<ClassSymbol> sealedSupers = types.directSupertypes(c.type)
5554 .stream()
5555 .filter(s -> s.tsym.isSealed())
5556 .map(s -> (ClassSymbol) s.tsym)
5557 .collect(List.collector());
5558
5559 if (sealedSupers.isEmpty()) {
5560 if ((c.flags_field & Flags.NON_SEALED) != 0) {
5561 boolean hasErrorSuper = false;
5562
5563 hasErrorSuper |= types.directSupertypes(c.type)
5564 .stream()
5565 .anyMatch(s -> s.tsym.kind == Kind.ERR);
5566
5567 ClassType ct = (ClassType) c.type;
5568
5569 hasErrorSuper |= !ct.isCompound() && ct.interfaces_field != ct.all_interfaces_field;
5570
5571 if (!hasErrorSuper) {
5572 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.NonSealedWithNoSealedSupertype(c));
5573 }
5574 }
5575 } else {
5576 if (c.isDirectlyOrIndirectlyLocal() && !c.isEnum()) {
5577 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.LocalClassesCantExtendSealed(c.isAnonymous() ? Fragments.Anonymous : Fragments.Local));
5578 }
5579
5580 if (!c.type.isCompound()) {
5581 for (ClassSymbol supertypeSym : sealedSupers) {
5582 if (!supertypeSym.isPermittedSubclass(c.type.tsym)) {
5583 log.error(TreeInfo.diagnosticPositionFor(c.type.tsym, env.tree), Errors.CantInheritFromSealed(supertypeSym));
5584 }
5585 }
5586 if (!c.isNonSealed() && !c.isFinal() && !c.isSealed()) {
5587 log.error(TreeInfo.diagnosticPositionFor(c, env.tree),
5588 c.isInterface() ?
5589 Errors.NonSealedOrSealedExpected :
5590 Errors.NonSealedSealedOrFinalExpected);
5591 }
5592 }
5593 }
5594
5595 deferredLintHandler.flush(env.tree, env.info.lint);
5596 env.info.returnResult = null;
5597 // java.lang.Enum may not be subclassed by a non-enum
5598 if (st.tsym == syms.enumSym &&
5599 ((c.flags_field & (Flags.ENUM|Flags.COMPOUND)) == 0))
5600 log.error(env.tree.pos(), Errors.EnumNoSubclassing);
5601
5602 // Enums may not be extended by source-level classes
5603 if (st.tsym != null &&
5604 ((st.tsym.flags_field & Flags.ENUM) != 0) &&
5605 ((c.flags_field & (Flags.ENUM | Flags.COMPOUND)) == 0)) {
5606 log.error(env.tree.pos(), Errors.EnumTypesNotExtensible);
5607 }
5608
5609 if (rs.isSerializable(c.type)) {
5610 env.info.isSerializable = true;
5611 }
5612
5613 attribClassBody(env, c);
5614
5615 chk.checkDeprecatedAnnotation(env.tree.pos(), c);
5616 chk.checkClassOverrideEqualsAndHashIfNeeded(env.tree.pos(), c);
5617 chk.checkFunctionalInterface((JCClassDecl) env.tree, c);
5618 chk.checkLeaksNotAccessible(env, (JCClassDecl) env.tree);
5619
5620 if (c.isImplicit()) {
5621 chk.checkHasMain(env.tree.pos(), c);
5622 }
5623 } finally {
5624 env.info.returnResult = prevReturnRes;
5625 log.useSource(prev);
5626 chk.setLint(prevLint);
5627 }
5628
5629 }
5630 }
5631
5632 public void visitImport(JCImport tree) {
5633 // nothing to do
5634 }
5635
5636 public void visitModuleDef(JCModuleDecl tree) {
5637 tree.sym.completeUsesProvides();
5638 ModuleSymbol msym = tree.sym;
5639 Lint lint = env.outer.info.lint = env.outer.info.lint.augment(msym);
5640 Lint prevLint = chk.setLint(lint);
5641 chk.checkModuleName(tree);
5642 chk.checkDeprecatedAnnotation(tree, msym);
5643
5644 try {
5645 deferredLintHandler.flush(tree.pos(), lint);
5646 } finally {
5647 chk.setLint(prevLint);
5648 }
5649 }
5650
5651 /** Finish the attribution of a class. */
5652 private void attribClassBody(Env<AttrContext> env, ClassSymbol c) {
5653 JCClassDecl tree = (JCClassDecl)env.tree;
5654 Assert.check(c == tree.sym);
5655
5656 // Validate type parameters, supertype and interfaces.
5657 attribStats(tree.typarams, env);
5658 if (!c.isAnonymous()) {
5659 //already checked if anonymous
5660 chk.validate(tree.typarams, env);
5661 chk.validate(tree.extending, env);
5662 chk.validate(tree.implementing, env);
5663 }
5664
5665 c.markAbstractIfNeeded(types);
5666
5667 // If this is a non-abstract class, check that it has no abstract
5668 // methods or unimplemented methods of an implemented interface.
5669 if ((c.flags() & (ABSTRACT | INTERFACE)) == 0) {
5670 chk.checkAllDefined(tree.pos(), c);
5671 }
5672
5673 if ((c.flags() & ANNOTATION) != 0) {
5674 if (tree.implementing.nonEmpty())
5675 log.error(tree.implementing.head.pos(),
5676 Errors.CantExtendIntfAnnotation);
5677 if (tree.typarams.nonEmpty()) {
5678 log.error(tree.typarams.head.pos(),
5679 Errors.IntfAnnotationCantHaveTypeParams(c));
5680 }
5681
5682 // If this annotation type has a @Repeatable, validate
5683 Attribute.Compound repeatable = c.getAnnotationTypeMetadata().getRepeatable();
5684 // If this annotation type has a @Repeatable, validate
5685 if (repeatable != null) {
5686 // get diagnostic position for error reporting
5687 DiagnosticPosition cbPos = getDiagnosticPosition(tree, repeatable.type);
5688 Assert.checkNonNull(cbPos);
5689
5690 chk.validateRepeatable(c, repeatable, cbPos);
5691 }
5692 } else {
5693 // Check that all extended classes and interfaces
5694 // are compatible (i.e. no two define methods with same arguments
5695 // yet different return types). (JLS 8.4.8.3)
5696 chk.checkCompatibleSupertypes(tree.pos(), c.type);
5697 chk.checkDefaultMethodClashes(tree.pos(), c.type);
5698 chk.checkPotentiallyAmbiguousOverloads(tree, c.type);
5699 }
5700
5701 // Check that class does not import the same parameterized interface
5702 // with two different argument lists.
5703 chk.checkClassBounds(tree.pos(), c.type);
5704
5705 tree.type = c.type;
5706
5707 for (List<JCTypeParameter> l = tree.typarams;
5708 l.nonEmpty(); l = l.tail) {
5709 Assert.checkNonNull(env.info.scope.findFirst(l.head.name));
5710 }
5711
5712 // Check that a generic class doesn't extend Throwable
5713 if (!c.type.allparams().isEmpty() && types.isSubtype(c.type, syms.throwableType))
5714 log.error(tree.extending.pos(), Errors.GenericThrowable);
5715
5716 // Check that all methods which implement some
5717 // method conform to the method they implement.
5718 chk.checkImplementations(tree);
5719
5720 //check that a resource implementing AutoCloseable cannot throw InterruptedException
5721 checkAutoCloseable(tree.pos(), env, c.type);
5722
5723 for (List<JCTree> l = tree.defs; l.nonEmpty(); l = l.tail) {
5724 // Attribute declaration
5725 attribStat(l.head, env);
5726 // Check that declarations in inner classes are not static (JLS 8.1.2)
5727 // Make an exception for static constants.
5728 if (!allowRecords &&
5729 c.owner.kind != PCK &&
5730 ((c.flags() & STATIC) == 0 || c.name == names.empty) &&
5731 (TreeInfo.flags(l.head) & (STATIC | INTERFACE)) != 0) {
5732 VarSymbol sym = null;
5733 if (l.head.hasTag(VARDEF)) sym = ((JCVariableDecl) l.head).sym;
5734 if (sym == null ||
5735 sym.kind != VAR ||
5736 sym.getConstValue() == null)
5737 log.error(l.head.pos(), Errors.IclsCantHaveStaticDecl(c));
5738 }
5739 }
5740
5741 // Check for proper placement of super()/this() calls.
5742 chk.checkSuperInitCalls(tree);
5743
5744 // Check for cycles among non-initial constructors.
5745 chk.checkCyclicConstructors(tree);
5746
5747 // Check for cycles among annotation elements.
5748 chk.checkNonCyclicElements(tree);
5749
5750 // Check for proper use of serialVersionUID and other
5751 // serialization-related fields and methods
5752 if (env.info.lint.isEnabled(LintCategory.SERIAL)
5753 && rs.isSerializable(c.type)
5754 && !c.isAnonymous()) {
5755 chk.checkSerialStructure(tree, c);
5756 }
5757 // Correctly organize the positions of the type annotations
5758 typeAnnotations.organizeTypeAnnotationsBodies(tree);
5759
5760 // Check type annotations applicability rules
5761 validateTypeAnnotations(tree, false);
5762 }
5763 // where
5764 /** get a diagnostic position for an attribute of Type t, or null if attribute missing */
5765 private DiagnosticPosition getDiagnosticPosition(JCClassDecl tree, Type t) {
5766 for(List<JCAnnotation> al = tree.mods.annotations; !al.isEmpty(); al = al.tail) {
5767 if (types.isSameType(al.head.annotationType.type, t))
5768 return al.head.pos();
5769 }
5770
5771 return null;
5772 }
5773
5774 private Type capture(Type type) {
5775 return types.capture(type);
5776 }
5777
5778 private void setSyntheticVariableType(JCVariableDecl tree, Type type) {
5779 if (type.isErroneous()) {
5780 tree.vartype = make.at(Position.NOPOS).Erroneous();
5781 } else {
5782 tree.vartype = make.at(Position.NOPOS).Type(type);
5783 }
5784 }
5785
5786 public void validateTypeAnnotations(JCTree tree, boolean sigOnly) {
5787 tree.accept(new TypeAnnotationsValidator(sigOnly));
5788 }
5789 //where
5790 private final class TypeAnnotationsValidator extends TreeScanner {
5791
5792 private final boolean sigOnly;
5793 public TypeAnnotationsValidator(boolean sigOnly) {
5794 this.sigOnly = sigOnly;
5795 }
5796
5797 public void visitAnnotation(JCAnnotation tree) {
5798 chk.validateTypeAnnotation(tree, null, false);
5799 super.visitAnnotation(tree);
5800 }
5801 public void visitAnnotatedType(JCAnnotatedType tree) {
5802 if (!tree.underlyingType.type.isErroneous()) {
5803 super.visitAnnotatedType(tree);
5804 }
5805 }
5806 public void visitTypeParameter(JCTypeParameter tree) {
5807 chk.validateTypeAnnotations(tree.annotations, tree.type.tsym, true);
5808 scan(tree.bounds);
5809 // Don't call super.
5810 // This is needed because above we call validateTypeAnnotation with
5811 // false, which would forbid annotations on type parameters.
5812 // super.visitTypeParameter(tree);
5813 }
5814 public void visitMethodDef(JCMethodDecl tree) {
5815 if (tree.recvparam != null &&
5816 !tree.recvparam.vartype.type.isErroneous()) {
5817 checkForDeclarationAnnotations(tree.recvparam.mods.annotations, tree.recvparam.sym);
5818 }
5819 if (tree.restype != null && tree.restype.type != null) {
5820 validateAnnotatedType(tree.restype, tree.restype.type);
5821 }
5822 if (sigOnly) {
5823 scan(tree.mods);
5824 scan(tree.restype);
5825 scan(tree.typarams);
5826 scan(tree.recvparam);
5827 scan(tree.params);
5828 scan(tree.thrown);
5829 } else {
5830 scan(tree.defaultValue);
5831 scan(tree.body);
5832 }
5833 }
5834 public void visitVarDef(final JCVariableDecl tree) {
5835 //System.err.println("validateTypeAnnotations.visitVarDef " + tree);
5836 if (tree.sym != null && tree.sym.type != null && !tree.isImplicitlyTyped())
5837 validateAnnotatedType(tree.vartype, tree.sym.type);
5838 scan(tree.mods);
5839 scan(tree.vartype);
5840 if (!sigOnly) {
5841 scan(tree.init);
5842 }
5843 }
5844 public void visitTypeCast(JCTypeCast tree) {
5845 if (tree.clazz != null && tree.clazz.type != null)
5846 validateAnnotatedType(tree.clazz, tree.clazz.type);
5847 super.visitTypeCast(tree);
5848 }
5849 public void visitTypeTest(JCInstanceOf tree) {
5850 if (tree.pattern != null && !(tree.pattern instanceof JCPattern) && tree.pattern.type != null)
5851 validateAnnotatedType(tree.pattern, tree.pattern.type);
5852 super.visitTypeTest(tree);
5853 }
5854 public void visitNewClass(JCNewClass tree) {
5855 if (tree.clazz != null && tree.clazz.type != null) {
5856 if (tree.clazz.hasTag(ANNOTATED_TYPE)) {
5857 checkForDeclarationAnnotations(((JCAnnotatedType) tree.clazz).annotations,
5858 tree.clazz.type.tsym);
5859 }
5860 if (tree.def != null) {
5861 checkForDeclarationAnnotations(tree.def.mods.annotations, tree.clazz.type.tsym);
5862 }
5863
5864 validateAnnotatedType(tree.clazz, tree.clazz.type);
5865 }
5866 super.visitNewClass(tree);
5867 }
5868 public void visitNewArray(JCNewArray tree) {
5869 if (tree.elemtype != null && tree.elemtype.type != null) {
5870 if (tree.elemtype.hasTag(ANNOTATED_TYPE)) {
5871 checkForDeclarationAnnotations(((JCAnnotatedType) tree.elemtype).annotations,
5872 tree.elemtype.type.tsym);
5873 }
5874 validateAnnotatedType(tree.elemtype, tree.elemtype.type);
5875 }
5876 super.visitNewArray(tree);
5877 }
5878 public void visitClassDef(JCClassDecl tree) {
5879 //System.err.println("validateTypeAnnotations.visitClassDef " + tree);
5880 if (sigOnly) {
5881 scan(tree.mods);
5882 scan(tree.typarams);
5883 scan(tree.extending);
5884 scan(tree.implementing);
5885 }
5886 for (JCTree member : tree.defs) {
5887 if (member.hasTag(Tag.CLASSDEF)) {
5888 continue;
5889 }
5890 scan(member);
5891 }
5892 }
5893 public void visitBlock(JCBlock tree) {
5894 if (!sigOnly) {
5895 scan(tree.stats);
5896 }
5897 }
5898
5899 /* I would want to model this after
5900 * com.sun.tools.javac.comp.Check.Validator.visitSelectInternal(JCFieldAccess)
5901 * and override visitSelect and visitTypeApply.
5902 * However, we only set the annotated type in the top-level type
5903 * of the symbol.
5904 * Therefore, we need to override each individual location where a type
5905 * can occur.
5906 */
5907 private void validateAnnotatedType(final JCTree errtree, final Type type) {
5908 //System.err.println("Attr.validateAnnotatedType: " + errtree + " type: " + type);
5909
5910 if (type.isPrimitiveOrVoid()) {
5911 return;
5912 }
5913
5914 JCTree enclTr = errtree;
5915 Type enclTy = type;
5916
5917 boolean repeat = true;
5918 while (repeat) {
5919 if (enclTr.hasTag(TYPEAPPLY)) {
5920 List<Type> tyargs = enclTy.getTypeArguments();
5921 List<JCExpression> trargs = ((JCTypeApply)enclTr).getTypeArguments();
5922 if (trargs.length() > 0) {
5923 // Nothing to do for diamonds
5924 if (tyargs.length() == trargs.length()) {
5925 for (int i = 0; i < tyargs.length(); ++i) {
5926 validateAnnotatedType(trargs.get(i), tyargs.get(i));
5927 }
5928 }
5929 // If the lengths don't match, it's either a diamond
5930 // or some nested type that redundantly provides
5931 // type arguments in the tree.
5932 }
5933
5934 // Look at the clazz part of a generic type
5935 enclTr = ((JCTree.JCTypeApply)enclTr).clazz;
5936 }
5937
5938 if (enclTr.hasTag(SELECT)) {
5939 enclTr = ((JCTree.JCFieldAccess)enclTr).getExpression();
5940 if (enclTy != null &&
5941 !enclTy.hasTag(NONE)) {
5942 enclTy = enclTy.getEnclosingType();
5943 }
5944 } else if (enclTr.hasTag(ANNOTATED_TYPE)) {
5945 JCAnnotatedType at = (JCTree.JCAnnotatedType) enclTr;
5946 if (enclTy == null || enclTy.hasTag(NONE)) {
5947 if (at.getAnnotations().size() == 1) {
5948 log.error(at.underlyingType.pos(), Errors.CantTypeAnnotateScoping1(at.getAnnotations().head.attribute));
5949 } else {
5950 ListBuffer<Attribute.Compound> comps = new ListBuffer<>();
5951 for (JCAnnotation an : at.getAnnotations()) {
5952 comps.add(an.attribute);
5953 }
5954 log.error(at.underlyingType.pos(), Errors.CantTypeAnnotateScoping(comps.toList()));
5955 }
5956 repeat = false;
5957 }
5958 enclTr = at.underlyingType;
5959 // enclTy doesn't need to be changed
5960 } else if (enclTr.hasTag(IDENT)) {
5961 repeat = false;
5962 } else if (enclTr.hasTag(JCTree.Tag.WILDCARD)) {
5963 JCWildcard wc = (JCWildcard) enclTr;
5964 if (wc.getKind() == JCTree.Kind.EXTENDS_WILDCARD ||
5965 wc.getKind() == JCTree.Kind.SUPER_WILDCARD) {
5966 validateAnnotatedType(wc.getBound(), wc.getBound().type);
5967 } else {
5968 // Nothing to do for UNBOUND
5969 }
5970 repeat = false;
5971 } else if (enclTr.hasTag(TYPEARRAY)) {
5972 JCArrayTypeTree art = (JCArrayTypeTree) enclTr;
5973 validateAnnotatedType(art.getType(), art.elemtype.type);
5974 repeat = false;
5975 } else if (enclTr.hasTag(TYPEUNION)) {
5976 JCTypeUnion ut = (JCTypeUnion) enclTr;
5977 for (JCTree t : ut.getTypeAlternatives()) {
5978 validateAnnotatedType(t, t.type);
5979 }
5980 repeat = false;
5981 } else if (enclTr.hasTag(TYPEINTERSECTION)) {
5982 JCTypeIntersection it = (JCTypeIntersection) enclTr;
5983 for (JCTree t : it.getBounds()) {
5984 validateAnnotatedType(t, t.type);
5985 }
5986 repeat = false;
5987 } else if (enclTr.getKind() == JCTree.Kind.PRIMITIVE_TYPE ||
5988 enclTr.getKind() == JCTree.Kind.ERRONEOUS) {
5989 repeat = false;
5990 } else {
5991 Assert.error("Unexpected tree: " + enclTr + " with kind: " + enclTr.getKind() +
5992 " within: "+ errtree + " with kind: " + errtree.getKind());
5993 }
5994 }
5995 }
5996
5997 private void checkForDeclarationAnnotations(List<? extends JCAnnotation> annotations,
5998 Symbol sym) {
5999 // Ensure that no declaration annotations are present.
6000 // Note that a tree type might be an AnnotatedType with
6001 // empty annotations, if only declaration annotations were given.
6002 // This method will raise an error for such a type.
6003 for (JCAnnotation ai : annotations) {
6004 if (!ai.type.isErroneous() &&
6005 typeAnnotations.annotationTargetType(ai, ai.attribute, sym) == TypeAnnotations.AnnotationType.DECLARATION) {
6006 log.error(ai.pos(), Errors.AnnotationTypeNotApplicableToType(ai.type));
6007 }
6008 }
6009 }
6010 }
6011
6012 // <editor-fold desc="post-attribution visitor">
6013
6014 /**
6015 * Handle missing types/symbols in an AST. This routine is useful when
6016 * the compiler has encountered some errors (which might have ended up
6017 * terminating attribution abruptly); if the compiler is used in fail-over
6018 * mode (e.g. by an IDE) and the AST contains semantic errors, this routine
6019 * prevents NPE to be propagated during subsequent compilation steps.
6020 */
6021 public void postAttr(JCTree tree) {
6022 new PostAttrAnalyzer().scan(tree);
6023 }
6024
6025 class PostAttrAnalyzer extends TreeScanner {
6026
6027 private void initTypeIfNeeded(JCTree that) {
6028 if (that.type == null) {
6029 if (that.hasTag(METHODDEF)) {
6030 that.type = dummyMethodType((JCMethodDecl)that);
6031 } else {
6032 that.type = syms.unknownType;
6033 }
6034 }
6035 }
6036
6037 /* Construct a dummy method type. If we have a method declaration,
6038 * and the declared return type is void, then use that return type
6039 * instead of UNKNOWN to avoid spurious error messages in lambda
6040 * bodies (see:JDK-8041704).
6041 */
6042 private Type dummyMethodType(JCMethodDecl md) {
6043 Type restype = syms.unknownType;
6044 if (md != null && md.restype != null && md.restype.hasTag(TYPEIDENT)) {
6045 JCPrimitiveTypeTree prim = (JCPrimitiveTypeTree)md.restype;
6046 if (prim.typetag == VOID)
6047 restype = syms.voidType;
6048 }
6049 return new MethodType(List.nil(), restype,
6050 List.nil(), syms.methodClass);
6051 }
6052 private Type dummyMethodType() {
6053 return dummyMethodType(null);
6054 }
6055
6056 @Override
6057 public void scan(JCTree tree) {
6058 if (tree == null) return;
6059 if (tree instanceof JCExpression) {
6060 initTypeIfNeeded(tree);
6061 }
6062 super.scan(tree);
6063 }
6064
6065 @Override
6066 public void visitIdent(JCIdent that) {
6067 if (that.sym == null) {
6068 that.sym = syms.unknownSymbol;
6069 }
6070 }
6071
6072 @Override
6073 public void visitSelect(JCFieldAccess that) {
6074 if (that.sym == null) {
6075 that.sym = syms.unknownSymbol;
6076 }
6077 super.visitSelect(that);
6078 }
6079
6080 @Override
6081 public void visitClassDef(JCClassDecl that) {
6082 initTypeIfNeeded(that);
6083 if (that.sym == null) {
6084 that.sym = new ClassSymbol(0, that.name, that.type, syms.noSymbol);
6085 }
6086 super.visitClassDef(that);
6087 }
6088
6089 @Override
6090 public void visitMethodDef(JCMethodDecl that) {
6091 initTypeIfNeeded(that);
6092 if (that.sym == null) {
6093 that.sym = new MethodSymbol(0, that.name, that.type, syms.noSymbol);
6094 }
6095 super.visitMethodDef(that);
6096 }
6097
6098 @Override
6099 public void visitVarDef(JCVariableDecl that) {
6100 initTypeIfNeeded(that);
6101 if (that.sym == null) {
6102 that.sym = new VarSymbol(0, that.name, that.type, syms.noSymbol);
6103 that.sym.adr = 0;
6104 }
6105 if (that.vartype == null) {
6106 that.vartype = make.at(Position.NOPOS).Erroneous();
6107 }
6108 super.visitVarDef(that);
6109 }
6110
6111 @Override
6112 public void visitBindingPattern(JCBindingPattern that) {
6113 initTypeIfNeeded(that);
6114 initTypeIfNeeded(that.var);
6115 if (that.var.sym == null) {
6116 that.var.sym = new BindingSymbol(0, that.var.name, that.var.type, syms.noSymbol);
6117 that.var.sym.adr = 0;
6118 }
6119 super.visitBindingPattern(that);
6120 }
6121
6122 @Override
6123 public void visitNewClass(JCNewClass that) {
6124 if (that.constructor == null) {
6125 that.constructor = new MethodSymbol(0, names.init,
6126 dummyMethodType(), syms.noSymbol);
6127 }
6128 if (that.constructorType == null) {
6129 that.constructorType = syms.unknownType;
6130 }
6131 super.visitNewClass(that);
6132 }
6133
6134 @Override
6135 public void visitAssignop(JCAssignOp that) {
6136 if (that.operator == null) {
6137 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6138 -1, syms.noSymbol);
6139 }
6140 super.visitAssignop(that);
6141 }
6142
6143 @Override
6144 public void visitBinary(JCBinary that) {
6145 if (that.operator == null) {
6146 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6147 -1, syms.noSymbol);
6148 }
6149 super.visitBinary(that);
6150 }
6151
6152 @Override
6153 public void visitUnary(JCUnary that) {
6154 if (that.operator == null) {
6155 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6156 -1, syms.noSymbol);
6157 }
6158 super.visitUnary(that);
6159 }
6160
6161 @Override
6162 public void visitReference(JCMemberReference that) {
6163 super.visitReference(that);
6164 if (that.sym == null) {
6165 that.sym = new MethodSymbol(0, names.empty, dummyMethodType(),
6166 syms.noSymbol);
6167 }
6168 }
6169 }
6170 // </editor-fold>
6171
6172 public void setPackageSymbols(JCExpression pid, Symbol pkg) {
6173 new TreeScanner() {
6174 Symbol packge = pkg;
6175 @Override
6176 public void visitIdent(JCIdent that) {
6177 that.sym = packge;
6178 }
6179
6180 @Override
6181 public void visitSelect(JCFieldAccess that) {
6182 that.sym = packge;
6183 packge = packge.owner;
6184 super.visitSelect(that);
6185 }
6186 }.scan(pid);
6187 }
6188
6189 }