1 /*
2 * Copyright (c) 1999, 2022, 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.stream.Stream;
32
33 import javax.lang.model.element.ElementKind;
34 import javax.tools.JavaFileObject;
35
36 import com.sun.source.tree.CaseTree;
37 import com.sun.source.tree.EnhancedForLoopTree;
38 import com.sun.source.tree.IdentifierTree;
39 import com.sun.source.tree.MemberReferenceTree.ReferenceMode;
40 import com.sun.source.tree.MemberSelectTree;
41 import com.sun.source.tree.TreeVisitor;
42 import com.sun.source.util.SimpleTreeVisitor;
43 import com.sun.tools.javac.code.*;
44 import com.sun.tools.javac.code.Lint.LintCategory;
45 import com.sun.tools.javac.code.Scope.WriteableScope;
46 import com.sun.tools.javac.code.Source.Feature;
47 import com.sun.tools.javac.code.Symbol.*;
48 import com.sun.tools.javac.code.Type.*;
49 import com.sun.tools.javac.code.Type.ClassType.Flavor;
50 import com.sun.tools.javac.code.TypeMetadata.Annotations;
51 import com.sun.tools.javac.code.Types.FunctionDescriptorLookupError;
52 import com.sun.tools.javac.comp.ArgumentAttr.LocalCacheContext;
53 import com.sun.tools.javac.comp.Check.CheckContext;
54 import com.sun.tools.javac.comp.DeferredAttr.AttrMode;
55 import com.sun.tools.javac.comp.MatchBindingsComputer.MatchBindings;
56 import com.sun.tools.javac.jvm.*;
57
58 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.Diamond;
59 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.DiamondInvalidArg;
60 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.DiamondInvalidArgs;
61
62 import com.sun.tools.javac.resources.CompilerProperties.Errors;
63 import com.sun.tools.javac.resources.CompilerProperties.Fragments;
64 import com.sun.tools.javac.resources.CompilerProperties.Warnings;
65 import com.sun.tools.javac.tree.*;
66 import com.sun.tools.javac.tree.JCTree.*;
67 import com.sun.tools.javac.tree.JCTree.JCPolyExpression.*;
68 import com.sun.tools.javac.util.*;
69 import com.sun.tools.javac.util.DefinedBy.Api;
70 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
71 import com.sun.tools.javac.util.JCDiagnostic.Error;
72 import com.sun.tools.javac.util.JCDiagnostic.Fragment;
73 import com.sun.tools.javac.util.JCDiagnostic.Warning;
74 import com.sun.tools.javac.util.List;
75
76 import static com.sun.tools.javac.code.Flags.*;
77 import static com.sun.tools.javac.code.Flags.ANNOTATION;
78 import static com.sun.tools.javac.code.Flags.BLOCK;
79 import static com.sun.tools.javac.code.Kinds.*;
80 import static com.sun.tools.javac.code.Kinds.Kind.*;
81 import static com.sun.tools.javac.code.TypeTag.*;
82 import static com.sun.tools.javac.code.TypeTag.WILDCARD;
83 import static com.sun.tools.javac.tree.JCTree.Tag.*;
84 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticFlag;
85
86 /** This is the main context-dependent analysis phase in GJC. It
87 * encompasses name resolution, type checking and constant folding as
88 * subtasks. Some subtasks involve auxiliary classes.
89 * @see Check
90 * @see Resolve
91 * @see ConstFold
92 * @see Infer
93 *
94 * <p><b>This is NOT part of any supported API.
95 * If you write code that depends on this, you do so at your own risk.
96 * This code and its internal interfaces are subject to change or
97 * deletion without notice.</b>
98 */
99 public class Attr extends JCTree.Visitor {
100 protected static final Context.Key<Attr> attrKey = new Context.Key<>();
101
102 final Names names;
103 final Log log;
104 final Symtab syms;
105 final Resolve rs;
106 final Operators operators;
107 final Infer infer;
108 final Analyzer analyzer;
109 final DeferredAttr deferredAttr;
110 final Check chk;
111 final Flow flow;
112 final MemberEnter memberEnter;
113 final TypeEnter typeEnter;
114 final TreeMaker make;
115 final ConstFold cfolder;
116 final Enter enter;
117 final Target target;
118 final Types types;
119 final Preview preview;
120 final JCDiagnostic.Factory diags;
121 final TypeAnnotations typeAnnotations;
122 final DeferredLintHandler deferredLintHandler;
123 final TypeEnvs typeEnvs;
124 final Dependencies dependencies;
125 final Annotate annotate;
126 final ArgumentAttr argumentAttr;
127 final MatchBindingsComputer matchBindingsComputer;
128 final AttrRecover attrRecover;
129
130 public static Attr instance(Context context) {
131 Attr instance = context.get(attrKey);
132 if (instance == null)
133 instance = new Attr(context);
134 return instance;
135 }
136
137 protected Attr(Context context) {
138 context.put(attrKey, this);
139
140 names = Names.instance(context);
141 log = Log.instance(context);
142 syms = Symtab.instance(context);
143 rs = Resolve.instance(context);
144 operators = Operators.instance(context);
145 chk = Check.instance(context);
146 flow = Flow.instance(context);
147 memberEnter = MemberEnter.instance(context);
148 typeEnter = TypeEnter.instance(context);
149 make = TreeMaker.instance(context);
150 enter = Enter.instance(context);
151 infer = Infer.instance(context);
152 analyzer = Analyzer.instance(context);
153 deferredAttr = DeferredAttr.instance(context);
154 cfolder = ConstFold.instance(context);
155 target = Target.instance(context);
156 types = Types.instance(context);
157 preview = Preview.instance(context);
158 diags = JCDiagnostic.Factory.instance(context);
159 annotate = Annotate.instance(context);
160 typeAnnotations = TypeAnnotations.instance(context);
161 deferredLintHandler = DeferredLintHandler.instance(context);
162 typeEnvs = TypeEnvs.instance(context);
163 dependencies = Dependencies.instance(context);
164 argumentAttr = ArgumentAttr.instance(context);
165 matchBindingsComputer = MatchBindingsComputer.instance(context);
166 attrRecover = AttrRecover.instance(context);
167
168 Options options = Options.instance(context);
169
170 Source source = Source.instance(context);
171 allowPrimitiveClasses = Feature.PRIMITIVE_CLASSES.allowedInSource(source) && options.isSet("enablePrimitiveClasses");
172 allowReifiableTypesInInstanceof = Feature.REIFIABLE_TYPES_INSTANCEOF.allowedInSource(source);
173 allowRecords = Feature.RECORDS.allowedInSource(source);
174 allowPatternSwitch = (preview.isEnabled() || !preview.isPreview(Feature.PATTERN_SWITCH)) &&
175 Feature.PATTERN_SWITCH.allowedInSource(source);
176 allowUnconditionalPatternsInstanceOf = (preview.isEnabled() || !preview.isPreview(Feature.UNCONDITIONAL_PATTERN_IN_INSTANCEOF)) &&
177 Feature.UNCONDITIONAL_PATTERN_IN_INSTANCEOF.allowedInSource(source);
178 sourceName = source.name;
179 useBeforeDeclarationWarning = options.isSet("useBeforeDeclarationWarning");
180
181 statInfo = new ResultInfo(KindSelector.NIL, Type.noType);
182 varAssignmentInfo = new ResultInfo(KindSelector.ASG, Type.noType);
183 unknownExprInfo = new ResultInfo(KindSelector.VAL, Type.noType);
184 methodAttrInfo = new MethodAttrInfo();
185 unknownTypeInfo = new ResultInfo(KindSelector.TYP, Type.noType);
186 unknownTypeExprInfo = new ResultInfo(KindSelector.VAL_TYP, Type.noType);
187 recoveryInfo = new RecoveryInfo(deferredAttr.emptyDeferredAttrContext);
188 }
189
190 /** Switch: allow primitive classes ?
191 */
192 boolean allowPrimitiveClasses;
193
194 /** Switch: reifiable types in instanceof enabled?
195 */
196 boolean allowReifiableTypesInInstanceof;
197
198 /** Are records allowed
199 */
200 private final boolean allowRecords;
201
202 /** Are patterns in switch allowed
203 */
204 private final boolean allowPatternSwitch;
205
206 /** Are unconditional patterns in instanceof allowed
207 */
208 private final boolean allowUnconditionalPatternsInstanceOf;
209
210 /**
211 * Switch: warn about use of variable before declaration?
212 * RFE: 6425594
213 */
214 boolean useBeforeDeclarationWarning;
215
216 /**
217 * Switch: name of source level; used for error reporting.
218 */
219 String sourceName;
220
221 /** Check kind and type of given tree against protokind and prototype.
222 * If check succeeds, store type in tree and return it.
223 * If check fails, store errType in tree and return it.
224 * No checks are performed if the prototype is a method type.
225 * It is not necessary in this case since we know that kind and type
226 * are correct.
227 *
228 * @param tree The tree whose kind and type is checked
229 * @param found The computed type of the tree
230 * @param ownkind The computed kind of the tree
231 * @param resultInfo The expected result of the tree
232 */
233 Type check(final JCTree tree,
234 final Type found,
235 final KindSelector ownkind,
236 final ResultInfo resultInfo) {
237 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
238 Type owntype;
239 boolean shouldCheck = !found.hasTag(ERROR) &&
240 !resultInfo.pt.hasTag(METHOD) &&
241 !resultInfo.pt.hasTag(FORALL);
242 if (shouldCheck && !ownkind.subset(resultInfo.pkind)) {
243 log.error(tree.pos(),
244 Errors.UnexpectedType(resultInfo.pkind.kindNames(),
245 ownkind.kindNames()));
246 owntype = types.createErrorType(found);
247 } else if (inferenceContext.free(found)) {
248 //delay the check if there are inference variables in the found type
249 //this means we are dealing with a partially inferred poly expression
250 owntype = shouldCheck ? resultInfo.pt : found;
251 if (resultInfo.checkMode.installPostInferenceHook()) {
252 inferenceContext.addFreeTypeListener(List.of(found),
253 instantiatedContext -> {
254 ResultInfo pendingResult =
255 resultInfo.dup(inferenceContext.asInstType(resultInfo.pt));
256 check(tree, inferenceContext.asInstType(found), ownkind, pendingResult);
257 });
258 }
259 } else {
260 owntype = shouldCheck ?
261 resultInfo.check(tree, found) :
262 found;
263 }
264 if (resultInfo.checkMode.updateTreeType()) {
265 tree.type = owntype;
266 }
267 return owntype;
268 }
269
270 /** Is given blank final variable assignable, i.e. in a scope where it
271 * may be assigned to even though it is final?
272 * @param v The blank final variable.
273 * @param env The current environment.
274 */
275 boolean isAssignableAsBlankFinal(VarSymbol v, Env<AttrContext> env) {
276 Symbol owner = env.info.scope.owner;
277 // owner refers to the innermost variable, method or
278 // initializer block declaration at this point.
279 boolean isAssignable =
280 v.owner == owner
281 ||
282 ((names.isInitOrVNew(owner.name) || // i.e. we are in a constructor
283 owner.kind == VAR || // i.e. we are in a variable initializer
284 (owner.flags() & BLOCK) != 0) // i.e. we are in an initializer block
285 &&
286 v.owner == owner.owner
287 &&
288 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env));
289 boolean insideCompactConstructor = env.enclMethod != null && TreeInfo.isCompactConstructor(env.enclMethod);
290 return isAssignable & !insideCompactConstructor;
291 }
292
293 /** Check that variable can be assigned to.
294 * @param pos The current source code position.
295 * @param v The assigned variable
296 * @param base If the variable is referred to in a Select, the part
297 * to the left of the `.', null otherwise.
298 * @param env The current environment.
299 */
300 void checkAssignable(DiagnosticPosition pos, VarSymbol v, JCTree base, Env<AttrContext> env) {
301 if (v.name == names._this) {
302 log.error(pos, Errors.CantAssignValToThis);
303 } else if ((v.flags() & FINAL) != 0 &&
304 ((v.flags() & HASINIT) != 0
305 ||
306 !((base == null ||
307 TreeInfo.isThisQualifier(base)) &&
308 isAssignableAsBlankFinal(v, env)))) {
309 if (v.isResourceVariable()) { //TWR resource
310 log.error(pos, Errors.TryResourceMayNotBeAssigned(v));
311 } else {
312 log.error(pos, Errors.CantAssignValToFinalVar(v));
313 }
314 }
315 }
316
317 /** Does tree represent a static reference to an identifier?
318 * It is assumed that tree is either a SELECT or an IDENT.
319 * We have to weed out selects from non-type names here.
320 * @param tree The candidate tree.
321 */
322 boolean isStaticReference(JCTree tree) {
323 if (tree.hasTag(SELECT)) {
324 Symbol lsym = TreeInfo.symbol(((JCFieldAccess) tree).selected);
325 if (lsym == null || lsym.kind != TYP) {
326 return false;
327 }
328 }
329 return true;
330 }
331
332 /** Is this symbol a type?
333 */
334 static boolean isType(Symbol sym) {
335 return sym != null && sym.kind == TYP;
336 }
337
338 /** The current `this' symbol.
339 * @param env The current environment.
340 */
341 Symbol thisSym(DiagnosticPosition pos, Env<AttrContext> env) {
342 return rs.resolveSelf(pos, env, env.enclClass.sym, names._this);
343 }
344
345 /** Attribute a parsed identifier.
346 * @param tree Parsed identifier name
347 * @param topLevel The toplevel to use
348 */
349 public Symbol attribIdent(JCTree tree, JCCompilationUnit topLevel) {
350 Env<AttrContext> localEnv = enter.topLevelEnv(topLevel);
351 localEnv.enclClass = make.ClassDef(make.Modifiers(0),
352 syms.errSymbol.name,
353 null, null, null, null);
354 localEnv.enclClass.sym = syms.errSymbol;
355 return attribIdent(tree, localEnv);
356 }
357
358 /** Attribute a parsed identifier.
359 * @param tree Parsed identifier name
360 * @param env The env to use
361 */
362 public Symbol attribIdent(JCTree tree, Env<AttrContext> env) {
363 return tree.accept(identAttributer, env);
364 }
365 // where
366 private TreeVisitor<Symbol,Env<AttrContext>> identAttributer = new IdentAttributer();
367 private class IdentAttributer extends SimpleTreeVisitor<Symbol,Env<AttrContext>> {
368 @Override @DefinedBy(Api.COMPILER_TREE)
369 public Symbol visitMemberSelect(MemberSelectTree node, Env<AttrContext> env) {
370 Symbol site = visit(node.getExpression(), env);
371 if (site.kind == ERR || site.kind == ABSENT_TYP || site.kind == HIDDEN)
372 return site;
373 Name name = (Name)node.getIdentifier();
374 if (site.kind == PCK) {
375 env.toplevel.packge = (PackageSymbol)site;
376 return rs.findIdentInPackage(null, env, (TypeSymbol)site, name,
377 KindSelector.TYP_PCK);
378 } else {
379 env.enclClass.sym = (ClassSymbol)site;
380 return rs.findMemberType(env, site.asType(), name, (TypeSymbol)site);
381 }
382 }
383
384 @Override @DefinedBy(Api.COMPILER_TREE)
385 public Symbol visitIdentifier(IdentifierTree node, Env<AttrContext> env) {
386 return rs.findIdent(null, env, (Name)node.getName(), KindSelector.TYP_PCK);
387 }
388 }
389
390 public Type coerce(Type etype, Type ttype) {
391 return cfolder.coerce(etype, ttype);
392 }
393
394 public Type attribType(JCTree node, TypeSymbol sym) {
395 Env<AttrContext> env = typeEnvs.get(sym);
396 Env<AttrContext> localEnv = env.dup(node, env.info.dup());
397 return attribTree(node, localEnv, unknownTypeInfo);
398 }
399
400 public Type attribImportQualifier(JCImport tree, Env<AttrContext> env) {
401 // Attribute qualifying package or class.
402 JCFieldAccess s = (JCFieldAccess)tree.qualid;
403 return attribTree(s.selected, env,
404 new ResultInfo(tree.staticImport ?
405 KindSelector.TYP : KindSelector.TYP_PCK,
406 Type.noType));
407 }
408
409 public Env<AttrContext> attribExprToTree(JCTree expr, Env<AttrContext> env, JCTree tree) {
410 return attribToTree(expr, env, tree, unknownExprInfo);
411 }
412
413 public Env<AttrContext> attribStatToTree(JCTree stmt, Env<AttrContext> env, JCTree tree) {
414 return attribToTree(stmt, env, tree, statInfo);
415 }
416
417 private Env<AttrContext> attribToTree(JCTree root, Env<AttrContext> env, JCTree tree, ResultInfo resultInfo) {
418 breakTree = tree;
419 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
420 try {
421 deferredAttr.attribSpeculative(root, env, resultInfo,
422 null, DeferredAttr.AttributionMode.ATTRIB_TO_TREE,
423 argumentAttr.withLocalCacheContext());
424 attrRecover.doRecovery();
425 } catch (BreakAttr b) {
426 return b.env;
427 } catch (AssertionError ae) {
428 if (ae.getCause() instanceof BreakAttr breakAttr) {
429 return breakAttr.env;
430 } else {
431 throw ae;
432 }
433 } finally {
434 breakTree = null;
435 log.useSource(prev);
436 }
437 return env;
438 }
439
440 private JCTree breakTree = null;
441
442 private static class BreakAttr extends RuntimeException {
443 static final long serialVersionUID = -6924771130405446405L;
444 private transient Env<AttrContext> env;
445 private BreakAttr(Env<AttrContext> env) {
446 this.env = env;
447 }
448 }
449
450 /**
451 * Mode controlling behavior of Attr.Check
452 */
453 enum CheckMode {
454
455 NORMAL,
456
457 /**
458 * Mode signalling 'fake check' - skip tree update. A side-effect of this mode is
459 * that the captured var cache in {@code InferenceContext} will be used in read-only
460 * mode when performing inference checks.
461 */
462 NO_TREE_UPDATE {
463 @Override
464 public boolean updateTreeType() {
465 return false;
466 }
467 },
468 /**
469 * Mode signalling that caller will manage free types in tree decorations.
470 */
471 NO_INFERENCE_HOOK {
472 @Override
473 public boolean installPostInferenceHook() {
474 return false;
475 }
476 };
477
478 public boolean updateTreeType() {
479 return true;
480 }
481 public boolean installPostInferenceHook() {
482 return true;
483 }
484 }
485
486
487 class ResultInfo {
488 final KindSelector pkind;
489 final Type pt;
490 final CheckContext checkContext;
491 final CheckMode checkMode;
492
493 ResultInfo(KindSelector pkind, Type pt) {
494 this(pkind, pt, chk.basicHandler, CheckMode.NORMAL);
495 }
496
497 ResultInfo(KindSelector pkind, Type pt, CheckMode checkMode) {
498 this(pkind, pt, chk.basicHandler, checkMode);
499 }
500
501 protected ResultInfo(KindSelector pkind,
502 Type pt, CheckContext checkContext) {
503 this(pkind, pt, checkContext, CheckMode.NORMAL);
504 }
505
506 protected ResultInfo(KindSelector pkind,
507 Type pt, CheckContext checkContext, CheckMode checkMode) {
508 this.pkind = pkind;
509 this.pt = pt;
510 this.checkContext = checkContext;
511 this.checkMode = checkMode;
512 }
513
514 /**
515 * Should {@link Attr#attribTree} use the {@ArgumentAttr} visitor instead of this one?
516 * @param tree The tree to be type-checked.
517 * @return true if {@ArgumentAttr} should be used.
518 */
519 protected boolean needsArgumentAttr(JCTree tree) { return false; }
520
521 protected Type check(final DiagnosticPosition pos, final Type found) {
522 return chk.checkType(pos, found, pt, checkContext);
523 }
524
525 protected ResultInfo dup(Type newPt) {
526 return new ResultInfo(pkind, newPt, checkContext, checkMode);
527 }
528
529 protected ResultInfo dup(CheckContext newContext) {
530 return new ResultInfo(pkind, pt, newContext, checkMode);
531 }
532
533 protected ResultInfo dup(Type newPt, CheckContext newContext) {
534 return new ResultInfo(pkind, newPt, newContext, checkMode);
535 }
536
537 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) {
538 return new ResultInfo(pkind, newPt, newContext, newMode);
539 }
540
541 protected ResultInfo dup(CheckMode newMode) {
542 return new ResultInfo(pkind, pt, checkContext, newMode);
543 }
544
545 @Override
546 public String toString() {
547 if (pt != null) {
548 return pt.toString();
549 } else {
550 return "";
551 }
552 }
553 }
554
555 class MethodAttrInfo extends ResultInfo {
556 public MethodAttrInfo() {
557 this(chk.basicHandler);
558 }
559
560 public MethodAttrInfo(CheckContext checkContext) {
561 super(KindSelector.VAL, Infer.anyPoly, checkContext);
562 }
563
564 @Override
565 protected boolean needsArgumentAttr(JCTree tree) {
566 return true;
567 }
568
569 protected ResultInfo dup(Type newPt) {
570 throw new IllegalStateException();
571 }
572
573 protected ResultInfo dup(CheckContext newContext) {
574 return new MethodAttrInfo(newContext);
575 }
576
577 protected ResultInfo dup(Type newPt, CheckContext newContext) {
578 throw new IllegalStateException();
579 }
580
581 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) {
582 throw new IllegalStateException();
583 }
584
585 protected ResultInfo dup(CheckMode newMode) {
586 throw new IllegalStateException();
587 }
588 }
589
590 class RecoveryInfo extends ResultInfo {
591
592 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext) {
593 this(deferredAttrContext, Type.recoveryType);
594 }
595
596 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext, Type pt) {
597 super(KindSelector.VAL, pt, new Check.NestedCheckContext(chk.basicHandler) {
598 @Override
599 public DeferredAttr.DeferredAttrContext deferredAttrContext() {
600 return deferredAttrContext;
601 }
602 @Override
603 public boolean compatible(Type found, Type req, Warner warn) {
604 return true;
605 }
606 @Override
607 public void report(DiagnosticPosition pos, JCDiagnostic details) {
608 boolean needsReport = pt == Type.recoveryType ||
609 (details.getDiagnosticPosition() != null &&
610 details.getDiagnosticPosition().getTree().hasTag(LAMBDA));
611 if (needsReport) {
612 chk.basicHandler.report(pos, details);
613 }
614 }
615 });
616 }
617 }
618
619 final ResultInfo statInfo;
620 final ResultInfo varAssignmentInfo;
621 final ResultInfo methodAttrInfo;
622 final ResultInfo unknownExprInfo;
623 final ResultInfo unknownTypeInfo;
624 final ResultInfo unknownTypeExprInfo;
625 final ResultInfo recoveryInfo;
626
627 Type pt() {
628 return resultInfo.pt;
629 }
630
631 KindSelector pkind() {
632 return resultInfo.pkind;
633 }
634
635 /* ************************************************************************
636 * Visitor methods
637 *************************************************************************/
638
639 /** Visitor argument: the current environment.
640 */
641 Env<AttrContext> env;
642
643 /** Visitor argument: the currently expected attribution result.
644 */
645 ResultInfo resultInfo;
646
647 /** Visitor result: the computed type.
648 */
649 Type result;
650
651 MatchBindings matchBindings = MatchBindingsComputer.EMPTY;
652
653 /** Visitor method: attribute a tree, catching any completion failure
654 * exceptions. Return the tree's type.
655 *
656 * @param tree The tree to be visited.
657 * @param env The environment visitor argument.
658 * @param resultInfo The result info visitor argument.
659 */
660 Type attribTree(JCTree tree, Env<AttrContext> env, ResultInfo resultInfo) {
661 Env<AttrContext> prevEnv = this.env;
662 ResultInfo prevResult = this.resultInfo;
663 try {
664 this.env = env;
665 this.resultInfo = resultInfo;
666 if (resultInfo.needsArgumentAttr(tree)) {
667 result = argumentAttr.attribArg(tree, env);
668 } else {
669 tree.accept(this);
670 }
671 matchBindings = matchBindingsComputer.finishBindings(tree,
672 matchBindings);
673 if (tree == breakTree &&
674 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
675 breakTreeFound(copyEnv(env));
676 }
677 return result;
678 } catch (CompletionFailure ex) {
679 tree.type = syms.errType;
680 return chk.completionError(tree.pos(), ex);
681 } finally {
682 this.env = prevEnv;
683 this.resultInfo = prevResult;
684 }
685 }
686
687 protected void breakTreeFound(Env<AttrContext> env) {
688 throw new BreakAttr(env);
689 }
690
691 Env<AttrContext> copyEnv(Env<AttrContext> env) {
692 Env<AttrContext> newEnv =
693 env.dup(env.tree, env.info.dup(copyScope(env.info.scope)));
694 if (newEnv.outer != null) {
695 newEnv.outer = copyEnv(newEnv.outer);
696 }
697 return newEnv;
698 }
699
700 WriteableScope copyScope(WriteableScope sc) {
701 WriteableScope newScope = WriteableScope.create(sc.owner);
702 List<Symbol> elemsList = List.nil();
703 for (Symbol sym : sc.getSymbols()) {
704 elemsList = elemsList.prepend(sym);
705 }
706 for (Symbol s : elemsList) {
707 newScope.enter(s);
708 }
709 return newScope;
710 }
711
712 /** Derived visitor method: attribute an expression tree.
713 */
714 public Type attribExpr(JCTree tree, Env<AttrContext> env, Type pt) {
715 return attribTree(tree, env, new ResultInfo(KindSelector.VAL, !pt.hasTag(ERROR) ? pt : Type.noType));
716 }
717
718 /** Derived visitor method: attribute an expression tree with
719 * no constraints on the computed type.
720 */
721 public Type attribExpr(JCTree tree, Env<AttrContext> env) {
722 return attribTree(tree, env, unknownExprInfo);
723 }
724
725 /** Derived visitor method: attribute a type tree.
726 */
727 public Type attribType(JCTree tree, Env<AttrContext> env) {
728 Type result = attribType(tree, env, Type.noType);
729 return result;
730 }
731
732 /** Derived visitor method: attribute a type tree.
733 */
734 Type attribType(JCTree tree, Env<AttrContext> env, Type pt) {
735 Type result = attribTree(tree, env, new ResultInfo(KindSelector.TYP, pt));
736 return result;
737 }
738
739 /** Derived visitor method: attribute a statement or definition tree.
740 */
741 public Type attribStat(JCTree tree, Env<AttrContext> env) {
742 Env<AttrContext> analyzeEnv = analyzer.copyEnvIfNeeded(tree, env);
743 Type result = attribTree(tree, env, statInfo);
744 analyzer.analyzeIfNeeded(tree, analyzeEnv);
745 attrRecover.doRecovery();
746 return result;
747 }
748
749 /** Attribute a list of expressions, returning a list of types.
750 */
751 List<Type> attribExprs(List<JCExpression> trees, Env<AttrContext> env, Type pt) {
752 ListBuffer<Type> ts = new ListBuffer<>();
753 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
754 ts.append(attribExpr(l.head, env, pt));
755 return ts.toList();
756 }
757
758 /** Attribute a list of statements, returning nothing.
759 */
760 <T extends JCTree> void attribStats(List<T> trees, Env<AttrContext> env) {
761 for (List<T> l = trees; l.nonEmpty(); l = l.tail)
762 attribStat(l.head, env);
763 }
764
765 /** Attribute the arguments in a method call, returning the method kind.
766 */
767 KindSelector attribArgs(KindSelector initialKind, List<JCExpression> trees, Env<AttrContext> env, ListBuffer<Type> argtypes) {
768 KindSelector kind = initialKind;
769 for (JCExpression arg : trees) {
770 Type argtype = chk.checkNonVoid(arg, attribTree(arg, env, methodAttrInfo));
771 if (argtype.hasTag(DEFERRED)) {
772 kind = KindSelector.of(KindSelector.POLY, kind);
773 }
774 argtypes.append(argtype);
775 }
776 return kind;
777 }
778
779 /** Attribute a type argument list, returning a list of types.
780 * Caller is responsible for calling checkRefTypes.
781 */
782 List<Type> attribAnyTypes(List<JCExpression> trees, Env<AttrContext> env) {
783 ListBuffer<Type> argtypes = new ListBuffer<>();
784 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
785 argtypes.append(attribType(l.head, env));
786 return argtypes.toList();
787 }
788
789 /** Attribute a type argument list, returning a list of types.
790 * Check that all the types are references.
791 */
792 List<Type> attribTypes(List<JCExpression> trees, Env<AttrContext> env) {
793 List<Type> types = attribAnyTypes(trees, env);
794 return chk.checkRefTypes(trees, types);
795 }
796
797 /**
798 * Attribute type variables (of generic classes or methods).
799 * Compound types are attributed later in attribBounds.
800 * @param typarams the type variables to enter
801 * @param env the current environment
802 */
803 void attribTypeVariables(List<JCTypeParameter> typarams, Env<AttrContext> env, boolean checkCyclic) {
804 for (JCTypeParameter tvar : typarams) {
805 TypeVar a = (TypeVar)tvar.type;
806 a.tsym.flags_field |= UNATTRIBUTED;
807 a.setUpperBound(Type.noType);
808 if (!tvar.bounds.isEmpty()) {
809 List<Type> bounds = List.of(chk.checkRefType(tvar.bounds.head, attribType(tvar.bounds.head, env), false));
810 for (JCExpression bound : tvar.bounds.tail)
811 bounds = bounds.prepend(chk.checkRefType(bound, attribType(bound, env), false));
812 types.setBounds(a, bounds.reverse());
813 } else {
814 // if no bounds are given, assume a single bound of
815 // java.lang.Object.
816 types.setBounds(a, List.of(syms.objectType));
817 }
818 a.tsym.flags_field &= ~UNATTRIBUTED;
819 }
820 if (checkCyclic) {
821 for (JCTypeParameter tvar : typarams) {
822 chk.checkNonCyclic(tvar.pos(), (TypeVar)tvar.type);
823 }
824 }
825 }
826
827 /**
828 * Attribute the type references in a list of annotations.
829 */
830 void attribAnnotationTypes(List<JCAnnotation> annotations,
831 Env<AttrContext> env) {
832 for (List<JCAnnotation> al = annotations; al.nonEmpty(); al = al.tail) {
833 JCAnnotation a = al.head;
834 attribType(a.annotationType, env);
835 }
836 }
837
838 /**
839 * Attribute a "lazy constant value".
840 * @param env The env for the const value
841 * @param variable The initializer for the const value
842 * @param type The expected type, or null
843 * @see VarSymbol#setLazyConstValue
844 */
845 public Object attribLazyConstantValue(Env<AttrContext> env,
846 JCVariableDecl variable,
847 Type type) {
848
849 DiagnosticPosition prevLintPos
850 = deferredLintHandler.setPos(variable.pos());
851
852 final JavaFileObject prevSource = log.useSource(env.toplevel.sourcefile);
853 try {
854 Type itype = attribExpr(variable.init, env, type);
855 if (variable.isImplicitlyTyped()) {
856 //fixup local variable type
857 type = variable.type = variable.sym.type = chk.checkLocalVarType(variable, itype, variable.name);
858 }
859 if (itype.constValue() != null) {
860 return coerce(itype, type).constValue();
861 } else {
862 return null;
863 }
864 } finally {
865 log.useSource(prevSource);
866 deferredLintHandler.setPos(prevLintPos);
867 }
868 }
869
870 /** Attribute type reference in an `extends' or `implements' clause.
871 * Supertypes of anonymous inner classes are usually already attributed.
872 *
873 * @param tree The tree making up the type reference.
874 * @param env The environment current at the reference.
875 * @param classExpected true if only a class is expected here.
876 * @param interfaceExpected true if only an interface is expected here.
877 */
878 Type attribBase(JCTree tree,
879 Env<AttrContext> env,
880 boolean classExpected,
881 boolean interfaceExpected,
882 boolean checkExtensible) {
883 Type t = tree.type != null ?
884 tree.type :
885 attribType(tree, env);
886 try {
887 return checkBase(t, tree, env, classExpected, interfaceExpected, checkExtensible);
888 } catch (CompletionFailure ex) {
889 chk.completionError(tree.pos(), ex);
890 return t;
891 }
892 }
893 Type checkBase(Type t,
894 JCTree tree,
895 Env<AttrContext> env,
896 boolean classExpected,
897 boolean interfaceExpected,
898 boolean checkExtensible) {
899 final DiagnosticPosition pos = tree.hasTag(TYPEAPPLY) ?
900 (((JCTypeApply) tree).clazz).pos() : tree.pos();
901 if (t.tsym.isAnonymous()) {
902 log.error(pos, Errors.CantInheritFromAnon);
903 return types.createErrorType(t);
904 }
905 if (t.isErroneous())
906 return t;
907 if (t.hasTag(TYPEVAR) && !classExpected && !interfaceExpected) {
908 // check that type variable is already visible
909 if (t.getUpperBound() == null) {
910 log.error(pos, Errors.IllegalForwardRef);
911 return types.createErrorType(t);
912 }
913 } else {
914 t = chk.checkClassType(pos, t, checkExtensible);
915 }
916 if (interfaceExpected && (t.tsym.flags() & INTERFACE) == 0) {
917 log.error(pos, Errors.IntfExpectedHere);
918 // return errType is necessary since otherwise there might
919 // be undetected cycles which cause attribution to loop
920 return types.createErrorType(t);
921 } else if (checkExtensible &&
922 classExpected &&
923 (t.tsym.flags() & INTERFACE) != 0) {
924 log.error(pos, Errors.NoIntfExpectedHere);
925 return types.createErrorType(t);
926 }
927 if (checkExtensible &&
928 ((t.tsym.flags() & FINAL) != 0)) {
929 log.error(pos,
930 Errors.CantInheritFromFinal(t.tsym));
931 }
932 chk.checkNonCyclic(pos, t);
933 return t;
934 }
935
936 Type attribIdentAsEnumType(Env<AttrContext> env, JCIdent id) {
937 Assert.check((env.enclClass.sym.flags() & ENUM) != 0);
938 id.type = env.info.scope.owner.enclClass().type;
939 id.sym = env.info.scope.owner.enclClass();
940 return id.type;
941 }
942
943 public void visitClassDef(JCClassDecl tree) {
944 Optional<ArgumentAttr.LocalCacheContext> localCacheContext =
945 Optional.ofNullable(env.info.attributionMode.isSpeculative ?
946 argumentAttr.withLocalCacheContext() : null);
947 try {
948 // Local and anonymous classes have not been entered yet, so we need to
949 // do it now.
950 if (env.info.scope.owner.kind.matches(KindSelector.VAL_MTH)) {
951 enter.classEnter(tree, env);
952 } else {
953 // If this class declaration is part of a class level annotation,
954 // as in @MyAnno(new Object() {}) class MyClass {}, enter it in
955 // order to simplify later steps and allow for sensible error
956 // messages.
957 if (env.tree.hasTag(NEWCLASS) && TreeInfo.isInAnnotation(env, tree))
958 enter.classEnter(tree, env);
959 }
960
961 ClassSymbol c = tree.sym;
962 if (c == null) {
963 // exit in case something drastic went wrong during enter.
964 result = null;
965 } else {
966 // make sure class has been completed:
967 c.complete();
968
969 // If this class appears as an anonymous class
970 // in a superclass constructor call
971 // disable implicit outer instance from being passed.
972 // (This would be an illegal access to "this before super").
973 if (env.info.isSelfCall &&
974 env.tree.hasTag(NEWCLASS)) {
975 c.flags_field |= NOOUTERTHIS;
976 }
977 attribClass(tree.pos(), c);
978 result = tree.type = c.type;
979 }
980 } finally {
981 localCacheContext.ifPresent(LocalCacheContext::leave);
982 }
983 }
984
985 public void visitMethodDef(JCMethodDecl tree) {
986 MethodSymbol m = tree.sym;
987 boolean isDefaultMethod = (m.flags() & DEFAULT) != 0;
988
989 Lint lint = env.info.lint.augment(m);
990 Lint prevLint = chk.setLint(lint);
991 MethodSymbol prevMethod = chk.setMethod(m);
992 try {
993 deferredLintHandler.flush(tree.pos());
994 chk.checkDeprecatedAnnotation(tree.pos(), m);
995
996
997 // Create a new environment with local scope
998 // for attributing the method.
999 Env<AttrContext> localEnv = memberEnter.methodEnv(tree, env);
1000 localEnv.info.lint = lint;
1001
1002 attribStats(tree.typarams, localEnv);
1003
1004 // If we override any other methods, check that we do so properly.
1005 // JLS ???
1006 if (m.isStatic()) {
1007 chk.checkHideClashes(tree.pos(), env.enclClass.type, m);
1008 } else {
1009 chk.checkOverrideClashes(tree.pos(), env.enclClass.type, m);
1010 }
1011 chk.checkOverride(env, tree, m);
1012
1013 if (isDefaultMethod && types.overridesObjectMethod(m.enclClass(), m)) {
1014 log.error(tree, Errors.DefaultOverridesObjectMember(m.name, Kinds.kindName(m.location()), m.location()));
1015 }
1016
1017 // Enter all type parameters into the local method scope.
1018 for (List<JCTypeParameter> l = tree.typarams; l.nonEmpty(); l = l.tail)
1019 localEnv.info.scope.enterIfAbsent(l.head.type.tsym);
1020
1021 ClassSymbol owner = env.enclClass.sym;
1022 if ((owner.flags() & ANNOTATION) != 0 &&
1023 (tree.params.nonEmpty() ||
1024 tree.recvparam != null))
1025 log.error(tree.params.nonEmpty() ?
1026 tree.params.head.pos() :
1027 tree.recvparam.pos(),
1028 Errors.IntfAnnotationMembersCantHaveParams);
1029
1030 // Attribute all value parameters.
1031 for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) {
1032 attribStat(l.head, localEnv);
1033 }
1034
1035 chk.checkVarargsMethodDecl(localEnv, tree);
1036
1037 // Check that type parameters are well-formed.
1038 chk.validate(tree.typarams, localEnv);
1039
1040 // Check that result type is well-formed.
1041 if (tree.restype != null && !tree.restype.type.hasTag(VOID))
1042 chk.validate(tree.restype, localEnv);
1043
1044 // Check that receiver type is well-formed.
1045 if (tree.recvparam != null) {
1046 // Use a new environment to check the receiver parameter.
1047 // Otherwise I get "might not have been initialized" errors.
1048 // Is there a better way?
1049 Env<AttrContext> newEnv = memberEnter.methodEnv(tree, env);
1050 attribType(tree.recvparam, newEnv);
1051 chk.validate(tree.recvparam, newEnv);
1052 }
1053
1054 if (env.enclClass.sym.isRecord() && tree.sym.owner.kind == TYP) {
1055 // lets find if this method is an accessor
1056 Optional<? extends RecordComponent> recordComponent = env.enclClass.sym.getRecordComponents().stream()
1057 .filter(rc -> rc.accessor == tree.sym && (rc.accessor.flags_field & GENERATED_MEMBER) == 0).findFirst();
1058 if (recordComponent.isPresent()) {
1059 // the method is a user defined accessor lets check that everything is fine
1060 if (!tree.sym.isPublic()) {
1061 log.error(tree, Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.MethodMustBePublic));
1062 }
1063 if (!types.isSameType(tree.sym.type.getReturnType(), recordComponent.get().type)) {
1064 log.error(tree, Errors.InvalidAccessorMethodInRecord(env.enclClass.sym,
1065 Fragments.AccessorReturnTypeDoesntMatch(tree.sym, recordComponent.get())));
1066 }
1067 if (tree.sym.type.asMethodType().thrown != null && !tree.sym.type.asMethodType().thrown.isEmpty()) {
1068 log.error(tree,
1069 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodCantThrowException));
1070 }
1071 if (!tree.typarams.isEmpty()) {
1072 log.error(tree,
1073 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodMustNotBeGeneric));
1074 }
1075 if (tree.sym.isStatic()) {
1076 log.error(tree,
1077 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodMustNotBeStatic));
1078 }
1079 }
1080
1081 if (names.isInitOrVNew(tree.name)) {
1082 // if this a constructor other than the canonical one
1083 if ((tree.sym.flags_field & RECORD) == 0) {
1084 JCMethodInvocation app = TreeInfo.firstConstructorCall(tree);
1085 if (app == null ||
1086 TreeInfo.name(app.meth) != names._this ||
1087 !checkFirstConstructorStat(app, tree, false)) {
1088 log.error(tree, Errors.FirstStatementMustBeCallToAnotherConstructor(env.enclClass.sym));
1089 }
1090 } else {
1091 // but if it is the canonical:
1092
1093 /* if user generated, then it shouldn't:
1094 * - have an accessibility stricter than that of the record type
1095 * - explicitly invoke any other constructor
1096 */
1097 if ((tree.sym.flags_field & GENERATEDCONSTR) == 0) {
1098 if (Check.protection(m.flags()) > Check.protection(env.enclClass.sym.flags())) {
1099 log.error(tree,
1100 (env.enclClass.sym.flags() & AccessFlags) == 0 ?
1101 Errors.InvalidCanonicalConstructorInRecord(
1102 Fragments.Canonical,
1103 env.enclClass.sym.name,
1104 Fragments.CanonicalMustNotHaveStrongerAccess("package")
1105 ) :
1106 Errors.InvalidCanonicalConstructorInRecord(
1107 Fragments.Canonical,
1108 env.enclClass.sym.name,
1109 Fragments.CanonicalMustNotHaveStrongerAccess(asFlagSet(env.enclClass.sym.flags() & AccessFlags))
1110 )
1111 );
1112 }
1113
1114 JCMethodInvocation app = TreeInfo.firstConstructorCall(tree);
1115 if (app != null &&
1116 (TreeInfo.name(app.meth) == names._this ||
1117 TreeInfo.name(app.meth) == names._super) &&
1118 checkFirstConstructorStat(app, tree, false)) {
1119 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1120 Fragments.Canonical, env.enclClass.sym.name,
1121 Fragments.CanonicalMustNotContainExplicitConstructorInvocation));
1122 }
1123 }
1124
1125 // also we want to check that no type variables have been defined
1126 if (!tree.typarams.isEmpty()) {
1127 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1128 Fragments.Canonical, env.enclClass.sym.name, Fragments.CanonicalMustNotDeclareTypeVariables));
1129 }
1130
1131 /* and now we need to check that the constructor's arguments are exactly the same as those of the
1132 * record components
1133 */
1134 List<? extends RecordComponent> recordComponents = env.enclClass.sym.getRecordComponents();
1135 List<Type> recordFieldTypes = TreeInfo.recordFields(env.enclClass).map(vd -> vd.sym.type);
1136 for (JCVariableDecl param: tree.params) {
1137 boolean paramIsVarArgs = (param.sym.flags_field & VARARGS) != 0;
1138 if (!types.isSameType(param.type, recordFieldTypes.head) ||
1139 (recordComponents.head.isVarargs() != paramIsVarArgs)) {
1140 log.error(param, Errors.InvalidCanonicalConstructorInRecord(
1141 Fragments.Canonical, env.enclClass.sym.name,
1142 Fragments.TypeMustBeIdenticalToCorrespondingRecordComponentType));
1143 }
1144 recordComponents = recordComponents.tail;
1145 recordFieldTypes = recordFieldTypes.tail;
1146 }
1147 }
1148 }
1149 }
1150
1151 // annotation method checks
1152 if ((owner.flags() & ANNOTATION) != 0) {
1153 // annotation method cannot have throws clause
1154 if (tree.thrown.nonEmpty()) {
1155 log.error(tree.thrown.head.pos(),
1156 Errors.ThrowsNotAllowedInIntfAnnotation);
1157 }
1158 // annotation method cannot declare type-parameters
1159 if (tree.typarams.nonEmpty()) {
1160 log.error(tree.typarams.head.pos(),
1161 Errors.IntfAnnotationMembersCantHaveTypeParams);
1162 }
1163 // validate annotation method's return type (could be an annotation type)
1164 chk.validateAnnotationType(tree.restype);
1165 // ensure that annotation method does not clash with members of Object/Annotation
1166 chk.validateAnnotationMethod(tree.pos(), m);
1167 }
1168
1169 for (List<JCExpression> l = tree.thrown; l.nonEmpty(); l = l.tail)
1170 chk.checkType(l.head.pos(), l.head.type, syms.throwableType);
1171
1172 if (tree.body == null) {
1173 // Empty bodies are only allowed for
1174 // abstract, native, or interface methods, or for methods
1175 // in a retrofit signature class.
1176 if (tree.defaultValue != null) {
1177 if ((owner.flags() & ANNOTATION) == 0)
1178 log.error(tree.pos(),
1179 Errors.DefaultAllowedInIntfAnnotationMember);
1180 }
1181 if (isDefaultMethod || (tree.sym.flags() & (ABSTRACT | NATIVE)) == 0)
1182 log.error(tree.pos(), Errors.MissingMethBodyOrDeclAbstract);
1183 } else {
1184 if ((tree.sym.flags() & (ABSTRACT|DEFAULT|PRIVATE)) == ABSTRACT) {
1185 if ((owner.flags() & INTERFACE) != 0) {
1186 log.error(tree.body.pos(), Errors.IntfMethCantHaveBody);
1187 } else {
1188 log.error(tree.pos(), Errors.AbstractMethCantHaveBody);
1189 }
1190 } else if ((tree.mods.flags & NATIVE) != 0) {
1191 log.error(tree.pos(), Errors.NativeMethCantHaveBody);
1192 }
1193 // Add an implicit super() call unless an explicit call to
1194 // super(...) or this(...) is given
1195 // or we are compiling class java.lang.Object.
1196 if (names.isInitOrVNew(tree.name) && owner.type != syms.objectType) {
1197 JCBlock body = tree.body;
1198 if (body.stats.isEmpty() ||
1199 TreeInfo.getConstructorInvocationName(body.stats, names, true) == names.empty) {
1200 JCStatement supCall = make.at(body.pos).Exec(make.Apply(List.nil(),
1201 make.Ident(names._super), make.Idents(List.nil())));
1202 body.stats = body.stats.prepend(supCall);
1203 } else if ((env.enclClass.sym.flags() & ENUM) != 0 &&
1204 (tree.mods.flags & GENERATEDCONSTR) == 0 &&
1205 TreeInfo.isSuperCall(body.stats.head)) {
1206 // enum constructors are not allowed to call super
1207 // directly, so make sure there aren't any super calls
1208 // in enum constructors, except in the compiler
1209 // generated one.
1210 log.error(tree.body.stats.head.pos(),
1211 Errors.CallToSuperNotAllowedInEnumCtor(env.enclClass.sym));
1212 } else if ((env.enclClass.sym.flags() & VALUE_CLASS) != 0 &&
1213 (tree.mods.flags & GENERATEDCONSTR) == 0 &&
1214 TreeInfo.isSuperCall(body.stats.head)) {
1215 // value constructors are not allowed to call super directly,
1216 // but tolerate compiler generated ones, these are ignored during code generation
1217 log.error(tree.body.stats.head.pos(), Errors.CallToSuperNotAllowedInValueCtor);
1218 }
1219 if (env.enclClass.sym.isRecord() && (tree.sym.flags_field & RECORD) != 0) { // we are seeing the canonical constructor
1220 List<Name> recordComponentNames = TreeInfo.recordFields(env.enclClass).map(vd -> vd.sym.name);
1221 List<Name> initParamNames = tree.sym.params.map(p -> p.name);
1222 if (!initParamNames.equals(recordComponentNames)) {
1223 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1224 Fragments.Canonical, env.enclClass.sym.name, Fragments.CanonicalWithNameMismatch));
1225 }
1226 if (tree.sym.type.asMethodType().thrown != null && !tree.sym.type.asMethodType().thrown.isEmpty()) {
1227 log.error(tree,
1228 Errors.InvalidCanonicalConstructorInRecord(
1229 TreeInfo.isCompactConstructor(tree) ? Fragments.Compact : Fragments.Canonical,
1230 env.enclClass.sym.name,
1231 Fragments.ThrowsClauseNotAllowedForCanonicalConstructor(
1232 TreeInfo.isCompactConstructor(tree) ? Fragments.Compact : Fragments.Canonical)));
1233 }
1234 }
1235 }
1236
1237 // Attribute all type annotations in the body
1238 annotate.queueScanTreeAndTypeAnnotate(tree.body, localEnv, m, null);
1239 annotate.flush();
1240
1241 // Attribute method body.
1242 attribStat(tree.body, localEnv);
1243 }
1244
1245 localEnv.info.scope.leave();
1246 result = tree.type = m.type;
1247 } finally {
1248 chk.setLint(prevLint);
1249 chk.setMethod(prevMethod);
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());
1303 chk.checkDeprecatedAnnotation(tree.pos(), v);
1304
1305 /* Don't want constant propagation/folding for instance fields of primitive classes,
1306 as these can undergo updates via copy on write.
1307 */
1308 if (tree.init != null) {
1309 if ((v.flags_field & FINAL) == 0 || ((v.flags_field & STATIC) == 0 && v.owner.isValueClass()) ||
1310 !memberEnter.needsLazyConstValue(tree.init)) {
1311 // Not a compile-time constant
1312 // Attribute initializer in a new environment
1313 // with the declared variable as owner.
1314 // Check that initializer conforms to variable's declared type.
1315 Env<AttrContext> initEnv = memberEnter.initEnv(tree, env);
1316 initEnv.info.lint = lint;
1317 // In order to catch self-references, we set the variable's
1318 // declaration position to maximal possible value, effectively
1319 // marking the variable as undefined.
1320 initEnv.info.enclVar = v;
1321 attribExpr(tree.init, initEnv, v.type);
1322 if (tree.isImplicitlyTyped()) {
1323 //fixup local variable type
1324 v.type = chk.checkLocalVarType(tree, tree.init.type, tree.name);
1325 }
1326 }
1327 if (tree.isImplicitlyTyped()) {
1328 setSyntheticVariableType(tree, v.type);
1329 }
1330 }
1331 result = tree.type = v.type;
1332 if (env.enclClass.sym.isRecord() && tree.sym.owner.kind == TYP && !v.isStatic()) {
1333 if (isNonArgsMethodInObject(v.name)) {
1334 log.error(tree, Errors.IllegalRecordComponentName(v));
1335 }
1336 }
1337 }
1338 finally {
1339 chk.setLint(prevLint);
1340 }
1341 }
1342
1343 private boolean isNonArgsMethodInObject(Name name) {
1344 for (Symbol s : syms.objectType.tsym.members().getSymbolsByName(name, s -> s.kind == MTH)) {
1345 if (s.type.getParameterTypes().isEmpty()) {
1346 return true;
1347 }
1348 }
1349 // isValueObject is not included in Object yet so we need a work around
1350 return name == names.isValueObject;
1351 }
1352
1353 Fragment canInferLocalVarType(JCVariableDecl tree) {
1354 LocalInitScanner lis = new LocalInitScanner();
1355 lis.scan(tree.init);
1356 return lis.badInferenceMsg;
1357 }
1358
1359 static class LocalInitScanner extends TreeScanner {
1360 Fragment badInferenceMsg = null;
1361 boolean needsTarget = true;
1362
1363 @Override
1364 public void visitNewArray(JCNewArray tree) {
1365 if (tree.elemtype == null && needsTarget) {
1366 badInferenceMsg = Fragments.LocalArrayMissingTarget;
1367 }
1368 }
1369
1370 @Override
1371 public void visitLambda(JCLambda tree) {
1372 if (needsTarget) {
1373 badInferenceMsg = Fragments.LocalLambdaMissingTarget;
1374 }
1375 }
1376
1377 @Override
1378 public void visitTypeCast(JCTypeCast tree) {
1379 boolean prevNeedsTarget = needsTarget;
1380 try {
1381 needsTarget = false;
1382 super.visitTypeCast(tree);
1383 } finally {
1384 needsTarget = prevNeedsTarget;
1385 }
1386 }
1387
1388 @Override
1389 public void visitReference(JCMemberReference tree) {
1390 if (needsTarget) {
1391 badInferenceMsg = Fragments.LocalMrefMissingTarget;
1392 }
1393 }
1394
1395 @Override
1396 public void visitNewClass(JCNewClass tree) {
1397 boolean prevNeedsTarget = needsTarget;
1398 try {
1399 needsTarget = false;
1400 super.visitNewClass(tree);
1401 } finally {
1402 needsTarget = prevNeedsTarget;
1403 }
1404 }
1405
1406 @Override
1407 public void visitApply(JCMethodInvocation tree) {
1408 boolean prevNeedsTarget = needsTarget;
1409 try {
1410 needsTarget = false;
1411 super.visitApply(tree);
1412 } finally {
1413 needsTarget = prevNeedsTarget;
1414 }
1415 }
1416 }
1417
1418 public void visitSkip(JCSkip tree) {
1419 result = null;
1420 }
1421
1422 public void visitBlock(JCBlock tree) {
1423 if (env.info.scope.owner.kind == TYP || env.info.scope.owner.kind == ERR) {
1424 // Block is a static or instance initializer;
1425 // let the owner of the environment be a freshly
1426 // created BLOCK-method.
1427 Symbol fakeOwner =
1428 new MethodSymbol(tree.flags | BLOCK |
1429 env.info.scope.owner.flags() & STRICTFP, names.empty, null,
1430 env.info.scope.owner);
1431 final Env<AttrContext> localEnv =
1432 env.dup(tree, env.info.dup(env.info.scope.dupUnshared(fakeOwner)));
1433
1434 if ((tree.flags & STATIC) != 0) localEnv.info.staticLevel++;
1435 // Attribute all type annotations in the block
1436 annotate.queueScanTreeAndTypeAnnotate(tree, localEnv, localEnv.info.scope.owner, null);
1437 annotate.flush();
1438 attribStats(tree.stats, localEnv);
1439
1440 {
1441 // Store init and clinit type annotations with the ClassSymbol
1442 // to allow output in Gen.normalizeDefs.
1443 ClassSymbol cs = (ClassSymbol)env.info.scope.owner;
1444 List<Attribute.TypeCompound> tas = localEnv.info.scope.owner.getRawTypeAttributes();
1445 if ((tree.flags & STATIC) != 0) {
1446 cs.appendClassInitTypeAttributes(tas);
1447 } else {
1448 cs.appendInitTypeAttributes(tas);
1449 }
1450 }
1451 } else {
1452 // Create a new local environment with a local scope.
1453 Env<AttrContext> localEnv =
1454 env.dup(tree, env.info.dup(env.info.scope.dup()));
1455 try {
1456 attribStats(tree.stats, localEnv);
1457 } finally {
1458 localEnv.info.scope.leave();
1459 }
1460 }
1461 result = null;
1462 }
1463
1464 public void visitDoLoop(JCDoWhileLoop tree) {
1465 attribStat(tree.body, env.dup(tree));
1466 attribExpr(tree.cond, env, syms.booleanType);
1467 if (!breaksOutOf(tree, tree.body)) {
1468 //include condition's body when false after the while, if cannot get out of the loop
1469 MatchBindings condBindings = matchBindings;
1470 condBindings.bindingsWhenFalse.forEach(env.info.scope::enter);
1471 condBindings.bindingsWhenFalse.forEach(BindingSymbol::preserveBinding);
1472 }
1473 result = null;
1474 }
1475
1476 public void visitWhileLoop(JCWhileLoop tree) {
1477 attribExpr(tree.cond, env, syms.booleanType);
1478 MatchBindings condBindings = matchBindings;
1479 // include condition's bindings when true in the body:
1480 Env<AttrContext> whileEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
1481 try {
1482 attribStat(tree.body, whileEnv.dup(tree));
1483 } finally {
1484 whileEnv.info.scope.leave();
1485 }
1486 if (!breaksOutOf(tree, tree.body)) {
1487 //include condition's bindings when false after the while, if cannot get out of the loop
1488 condBindings.bindingsWhenFalse.forEach(env.info.scope::enter);
1489 condBindings.bindingsWhenFalse.forEach(BindingSymbol::preserveBinding);
1490 }
1491 result = null;
1492 }
1493
1494 private boolean breaksOutOf(JCTree loop, JCTree body) {
1495 preFlow(body);
1496 return flow.breaksOutOf(env, loop, body, make);
1497 }
1498
1499 public void visitForLoop(JCForLoop tree) {
1500 Env<AttrContext> loopEnv =
1501 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1502 MatchBindings condBindings = MatchBindingsComputer.EMPTY;
1503 try {
1504 attribStats(tree.init, loopEnv);
1505 if (tree.cond != null) {
1506 attribExpr(tree.cond, loopEnv, syms.booleanType);
1507 // include condition's bindings when true in the body and step:
1508 condBindings = matchBindings;
1509 }
1510 Env<AttrContext> bodyEnv = bindingEnv(loopEnv, condBindings.bindingsWhenTrue);
1511 try {
1512 bodyEnv.tree = tree; // before, we were not in loop!
1513 attribStats(tree.step, bodyEnv);
1514 attribStat(tree.body, bodyEnv);
1515 } finally {
1516 bodyEnv.info.scope.leave();
1517 }
1518 result = null;
1519 }
1520 finally {
1521 loopEnv.info.scope.leave();
1522 }
1523 if (!breaksOutOf(tree, tree.body)) {
1524 //include condition's body when false after the while, if cannot get out of the loop
1525 condBindings.bindingsWhenFalse.forEach(env.info.scope::enter);
1526 condBindings.bindingsWhenFalse.forEach(BindingSymbol::preserveBinding);
1527 }
1528 }
1529
1530 public void visitForeachLoop(JCEnhancedForLoop tree) {
1531 Env<AttrContext> loopEnv =
1532 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1533
1534 try {
1535 //the Formal Parameter of a for-each loop is not in the scope when
1536 //attributing the for-each expression; we mimic this by attributing
1537 //the for-each expression first (against original scope).
1538 Type exprType = types.cvarUpperBound(attribExpr(tree.expr, loopEnv));
1539 chk.checkNonVoid(tree.pos(), exprType);
1540 tree.elementType = types.elemtype(exprType); // perhaps expr is an array?
1541 if (tree.elementType == null) {
1542 // or perhaps expr implements Iterable<T>?
1543 Type base = types.asSuper(exprType.referenceProjectionOrSelf(), syms.iterableType.tsym);
1544 if (base == null) {
1545 log.error(tree.expr.pos(),
1546 Errors.ForeachNotApplicableToType(exprType,
1547 Fragments.TypeReqArrayOrIterable));
1548 tree.elementType = types.createErrorType(exprType);
1549 } else {
1550 List<Type> iterableParams = base.allparams();
1551 tree.elementType = iterableParams.isEmpty()
1552 ? syms.objectType
1553 : types.wildUpperBound(iterableParams.head);
1554
1555 // Check the return type of the method iterator().
1556 // This is the bare minimum we need to verify to make sure code generation doesn't crash.
1557 Symbol iterSymbol = rs.resolveInternalMethod(tree.pos(),
1558 loopEnv, types.skipTypeVars(exprType, false), names.iterator, List.nil(), List.nil());
1559 if (types.asSuper(iterSymbol.type.getReturnType().referenceProjectionOrSelf(), syms.iteratorType.tsym) == null) {
1560 log.error(tree.pos(),
1561 Errors.ForeachNotApplicableToType(exprType, Fragments.TypeReqArrayOrIterable));
1562 }
1563 }
1564 }
1565 if (tree.varOrRecordPattern instanceof JCVariableDecl jcVariableDecl) {
1566 if (jcVariableDecl.isImplicitlyTyped()) {
1567 Type inferredType = chk.checkLocalVarType(jcVariableDecl, tree.elementType, jcVariableDecl.name);
1568 setSyntheticVariableType(jcVariableDecl, inferredType);
1569 }
1570 attribStat(jcVariableDecl, loopEnv);
1571 chk.checkType(tree.expr.pos(), tree.elementType, jcVariableDecl.sym.type);
1572
1573 loopEnv.tree = tree; // before, we were not in loop!
1574 attribStat(tree.body, loopEnv);
1575 } else {
1576 Assert.check(tree.getDeclarationKind() == EnhancedForLoopTree.DeclarationKind.PATTERN);
1577 JCRecordPattern jcRecordPattern = (JCRecordPattern) tree.varOrRecordPattern;
1578
1579 attribExpr(jcRecordPattern, loopEnv, tree.elementType);
1580
1581 // for(<pattern> x : xs) { y }
1582 // we include x's bindings when true in y
1583 // we don't do anything with x's bindings when false
1584
1585 MatchBindings forWithRecordPatternBindings = matchBindings;
1586 Env<AttrContext> recordPatternEnv = bindingEnv(loopEnv, forWithRecordPatternBindings.bindingsWhenTrue);
1587
1588 Type clazztype = jcRecordPattern.type;
1589
1590 checkCastablePattern(tree.expr.pos(), tree.elementType, clazztype);
1591
1592 recordPatternEnv.tree = tree; // before, we were not in loop!
1593 try {
1594 attribStat(tree.body, recordPatternEnv);
1595 } finally {
1596 recordPatternEnv.info.scope.leave();
1597 }
1598 }
1599 result = null;
1600 }
1601 finally {
1602 loopEnv.info.scope.leave();
1603 }
1604 }
1605
1606 public void visitLabelled(JCLabeledStatement tree) {
1607 // Check that label is not used in an enclosing statement
1608 Env<AttrContext> env1 = env;
1609 while (env1 != null && !env1.tree.hasTag(CLASSDEF)) {
1610 if (env1.tree.hasTag(LABELLED) &&
1611 ((JCLabeledStatement) env1.tree).label == tree.label) {
1612 log.error(tree.pos(),
1613 Errors.LabelAlreadyInUse(tree.label));
1614 break;
1615 }
1616 env1 = env1.next;
1617 }
1618
1619 attribStat(tree.body, env.dup(tree));
1620 result = null;
1621 }
1622
1623 public void visitSwitch(JCSwitch tree) {
1624 handleSwitch(tree, tree.selector, tree.cases, (c, caseEnv) -> {
1625 attribStats(c.stats, caseEnv);
1626 });
1627 result = null;
1628 }
1629
1630 public void visitSwitchExpression(JCSwitchExpression tree) {
1631 tree.polyKind = (pt().hasTag(NONE) && pt() != Type.recoveryType && pt() != Infer.anyPoly) ?
1632 PolyKind.STANDALONE : PolyKind.POLY;
1633
1634 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) {
1635 //this means we are returning a poly conditional from void-compatible lambda expression
1636 resultInfo.checkContext.report(tree, diags.fragment(Fragments.SwitchExpressionTargetCantBeVoid));
1637 result = tree.type = types.createErrorType(resultInfo.pt);
1638 return;
1639 }
1640
1641 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ?
1642 unknownExprInfo :
1643 resultInfo.dup(switchExpressionContext(resultInfo.checkContext));
1644
1645 ListBuffer<DiagnosticPosition> caseTypePositions = new ListBuffer<>();
1646 ListBuffer<Type> caseTypes = new ListBuffer<>();
1647
1648 handleSwitch(tree, tree.selector, tree.cases, (c, caseEnv) -> {
1649 caseEnv.info.yieldResult = condInfo;
1650 attribStats(c.stats, caseEnv);
1651 new TreeScanner() {
1652 @Override
1653 public void visitYield(JCYield brk) {
1654 if (brk.target == tree) {
1655 caseTypePositions.append(brk.value != null ? brk.value.pos() : brk.pos());
1656 caseTypes.append(brk.value != null ? brk.value.type : syms.errType);
1657 }
1658 super.visitYield(brk);
1659 }
1660
1661 @Override public void visitClassDef(JCClassDecl tree) {}
1662 @Override public void visitLambda(JCLambda tree) {}
1663 }.scan(c.stats);
1664 });
1665
1666 if (tree.cases.isEmpty()) {
1667 log.error(tree.pos(),
1668 Errors.SwitchExpressionEmpty);
1669 } else if (caseTypes.isEmpty()) {
1670 log.error(tree.pos(),
1671 Errors.SwitchExpressionNoResultExpressions);
1672 }
1673
1674 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ? condType(caseTypePositions.toList(), caseTypes.toList()) : pt();
1675
1676 result = tree.type = check(tree, owntype, KindSelector.VAL, resultInfo);
1677 }
1678 //where:
1679 CheckContext switchExpressionContext(CheckContext checkContext) {
1680 return new Check.NestedCheckContext(checkContext) {
1681 //this will use enclosing check context to check compatibility of
1682 //subexpression against target type; if we are in a method check context,
1683 //depending on whether boxing is allowed, we could have incompatibilities
1684 @Override
1685 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1686 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleTypeInSwitchExpression(details)));
1687 }
1688 };
1689 }
1690
1691 private void handleSwitch(JCTree switchTree,
1692 JCExpression selector,
1693 List<JCCase> cases,
1694 BiConsumer<JCCase, Env<AttrContext>> attribCase) {
1695 Type seltype = attribExpr(selector, env);
1696
1697 Env<AttrContext> switchEnv =
1698 env.dup(switchTree, env.info.dup(env.info.scope.dup()));
1699
1700 try {
1701 boolean enumSwitch = (seltype.tsym.flags() & Flags.ENUM) != 0;
1702 boolean stringSwitch = types.isSameType(seltype, syms.stringType);
1703 boolean errorEnumSwitch = TreeInfo.isErrorEnumSwitch(selector, cases);
1704 boolean patternSwitch;
1705 if (!enumSwitch && !stringSwitch && !errorEnumSwitch &&
1706 !types.isAssignable(seltype, syms.intType)) {
1707 preview.checkSourceLevel(selector.pos(), Feature.PATTERN_SWITCH);
1708 patternSwitch = true;
1709 } else {
1710 patternSwitch = cases.stream()
1711 .flatMap(c -> c.labels.stream())
1712 .anyMatch(l -> l.hasTag(PATTERNCASELABEL) ||
1713 TreeInfo.isNullCaseLabel(l));
1714 }
1715
1716 // Attribute all cases and
1717 // check that there are no duplicate case labels or default clauses.
1718 Set<Object> constants = new HashSet<>(); // The set of case constants.
1719 boolean hasDefault = false; // Is there a default label?
1720 boolean hasUnconditionalPattern = false; // Is there a unconditional pattern?
1721 boolean lastPatternErroneous = false; // Has the last pattern erroneous type?
1722 boolean hasNullPattern = false; // Is there a null pattern?
1723 CaseTree.CaseKind caseKind = null;
1724 boolean wasError = false;
1725 for (List<JCCase> l = cases; l.nonEmpty(); l = l.tail) {
1726 JCCase c = l.head;
1727 if (caseKind == null) {
1728 caseKind = c.caseKind;
1729 } else if (caseKind != c.caseKind && !wasError) {
1730 log.error(c.pos(),
1731 Errors.SwitchMixingCaseTypes);
1732 wasError = true;
1733 }
1734 MatchBindings currentBindings = null;
1735 boolean wasUnconditionalPattern = hasUnconditionalPattern;
1736 for (JCCaseLabel label : c.labels) {
1737 if (label instanceof JCConstantCaseLabel constLabel) {
1738 JCExpression expr = constLabel.expr;
1739 if (TreeInfo.isNull(expr)) {
1740 preview.checkSourceLevel(expr.pos(), Feature.CASE_NULL);
1741 if (hasNullPattern) {
1742 log.error(label.pos(), Errors.DuplicateCaseLabel);
1743 }
1744 hasNullPattern = true;
1745 attribExpr(expr, switchEnv, seltype);
1746 matchBindings = new MatchBindings(matchBindings.bindingsWhenTrue, matchBindings.bindingsWhenFalse, true);
1747 } else if (enumSwitch) {
1748 Symbol sym = enumConstant(expr, seltype);
1749 if (sym == null) {
1750 log.error(expr.pos(), Errors.EnumLabelMustBeUnqualifiedEnum);
1751 } else if (!constants.add(sym)) {
1752 log.error(label.pos(), Errors.DuplicateCaseLabel);
1753 }
1754 } else if (errorEnumSwitch) {
1755 //error recovery: the selector is erroneous, and all the case labels
1756 //are identifiers. This could be an enum switch - don't report resolve
1757 //error for the case label:
1758 var prevResolveHelper = rs.basicLogResolveHelper;
1759 try {
1760 rs.basicLogResolveHelper = rs.silentLogResolveHelper;
1761 attribExpr(expr, switchEnv, seltype);
1762 } finally {
1763 rs.basicLogResolveHelper = prevResolveHelper;
1764 }
1765 } else {
1766 ResultInfo valTypInfo = new ResultInfo(KindSelector.VAL_TYP,
1767 !seltype.hasTag(ERROR) ? seltype
1768 : Type.noType);
1769 Type pattype = attribTree(expr, switchEnv, valTypInfo);
1770 if (!pattype.hasTag(ERROR)) {
1771 if (pattype.constValue() == null) {
1772 Symbol s = TreeInfo.symbol(expr);
1773 if (s != null && s.kind == TYP && allowPatternSwitch) {
1774 log.error(expr.pos(),
1775 Errors.PatternExpected);
1776 } else {
1777 log.error(expr.pos(),
1778 (stringSwitch ? Errors.StringConstReq : Errors.ConstExprReq));
1779 }
1780 } else if (!stringSwitch && !types.isAssignable(seltype, syms.intType)) {
1781 log.error(label.pos(), Errors.ConstantLabelNotCompatible(pattype, seltype));
1782 } else if (!constants.add(pattype.constValue())) {
1783 log.error(c.pos(), Errors.DuplicateCaseLabel);
1784 }
1785 }
1786 }
1787 } else if (label instanceof JCDefaultCaseLabel def) {
1788 if (hasDefault) {
1789 log.error(label.pos(), Errors.DuplicateDefaultLabel);
1790 } else if (hasUnconditionalPattern) {
1791 log.error(label.pos(), Errors.UnconditionalPatternAndDefault);
1792 }
1793 hasDefault = true;
1794 matchBindings = MatchBindingsComputer.EMPTY;
1795 } else if (label instanceof JCPatternCaseLabel patternlabel) {
1796 //pattern
1797 JCPattern pat = patternlabel.pat;
1798 attribExpr(pat, switchEnv, seltype);
1799 Type primaryType = TreeInfo.primaryPatternType(pat);
1800 if (!primaryType.hasTag(TYPEVAR)) {
1801 primaryType = chk.checkClassOrArrayType(pat.pos(), primaryType);
1802 }
1803 checkCastablePattern(pat.pos(), seltype, primaryType);
1804 Type patternType = types.erasure(primaryType);
1805 JCExpression guard = patternlabel.guard;
1806 if (guard != null) {
1807 MatchBindings afterPattern = matchBindings;
1808 Env<AttrContext> bodyEnv = bindingEnv(switchEnv, matchBindings.bindingsWhenTrue);
1809 try {
1810 attribExpr(guard, bodyEnv, syms.booleanType);
1811 } finally {
1812 bodyEnv.info.scope.leave();
1813 }
1814 matchBindings = matchBindingsComputer.caseGuard(c, afterPattern, matchBindings);
1815
1816 if (TreeInfo.isBooleanWithValue(guard, 0)) {
1817 log.error(guard.pos(), Errors.GuardHasConstantExpressionFalse);
1818 }
1819 }
1820 boolean unguarded = TreeInfo.unguardedCaseLabel(label) && !pat.hasTag(RECORDPATTERN);
1821 boolean unconditional =
1822 unguarded &&
1823 !patternType.isErroneous() &&
1824 types.isSubtype(types.boxedTypeOrType(types.erasure(seltype)),
1825 patternType);
1826 if (unconditional) {
1827 if (hasUnconditionalPattern) {
1828 log.error(pat.pos(), Errors.DuplicateUnconditionalPattern);
1829 } else if (hasDefault) {
1830 log.error(pat.pos(), Errors.UnconditionalPatternAndDefault);
1831 }
1832 hasUnconditionalPattern = true;
1833 }
1834 lastPatternErroneous = patternType.isErroneous();
1835 } else {
1836 Assert.error();
1837 }
1838 currentBindings = matchBindingsComputer.switchCase(label, currentBindings, matchBindings);
1839 }
1840
1841 Env<AttrContext> caseEnv =
1842 bindingEnv(switchEnv, c, currentBindings.bindingsWhenTrue);
1843 try {
1844 attribCase.accept(c, caseEnv);
1845 } finally {
1846 caseEnv.info.scope.leave();
1847 }
1848 addVars(c.stats, switchEnv.info.scope);
1849
1850 preFlow(c);
1851 c.completesNormally = flow.aliveAfter(caseEnv, c, make);
1852 }
1853 if (patternSwitch) {
1854 chk.checkSwitchCaseStructure(cases);
1855 chk.checkSwitchCaseLabelDominated(cases);
1856 }
1857 if (switchTree.hasTag(SWITCH)) {
1858 ((JCSwitch) switchTree).hasUnconditionalPattern =
1859 hasDefault || hasUnconditionalPattern || lastPatternErroneous;
1860 ((JCSwitch) switchTree).patternSwitch = patternSwitch;
1861 } else if (switchTree.hasTag(SWITCH_EXPRESSION)) {
1862 ((JCSwitchExpression) switchTree).hasUnconditionalPattern =
1863 hasDefault || hasUnconditionalPattern || lastPatternErroneous;
1864 ((JCSwitchExpression) switchTree).patternSwitch = patternSwitch;
1865 } else {
1866 Assert.error(switchTree.getTag().name());
1867 }
1868 } finally {
1869 switchEnv.info.scope.leave();
1870 }
1871 }
1872 // where
1873 /** Add any variables defined in stats to the switch scope. */
1874 private static void addVars(List<JCStatement> stats, WriteableScope switchScope) {
1875 for (;stats.nonEmpty(); stats = stats.tail) {
1876 JCTree stat = stats.head;
1877 if (stat.hasTag(VARDEF))
1878 switchScope.enter(((JCVariableDecl) stat).sym);
1879 }
1880 }
1881 // where
1882 /** Return the selected enumeration constant symbol, or null. */
1883 private Symbol enumConstant(JCTree tree, Type enumType) {
1884 if (tree.hasTag(IDENT)) {
1885 JCIdent ident = (JCIdent)tree;
1886 Name name = ident.name;
1887 for (Symbol sym : enumType.tsym.members().getSymbolsByName(name)) {
1888 if (sym.kind == VAR) {
1889 Symbol s = ident.sym = sym;
1890 ((VarSymbol)s).getConstValue(); // ensure initializer is evaluated
1891 ident.type = s.type;
1892 return ((s.flags_field & Flags.ENUM) == 0)
1893 ? null : s;
1894 }
1895 }
1896 }
1897 return null;
1898 }
1899
1900 public void visitSynchronized(JCSynchronized tree) {
1901 chk.checkIdentityType(tree.pos(), attribExpr(tree.lock, env));
1902 if (env.info.lint.isEnabled(LintCategory.SYNCHRONIZATION) && isValueBased(tree.lock.type)) {
1903 log.warning(LintCategory.SYNCHRONIZATION, tree.pos(), Warnings.AttemptToSynchronizeOnInstanceOfValueBasedClass);
1904 }
1905 attribStat(tree.body, env);
1906 result = null;
1907 }
1908 // where
1909 private boolean isValueBased(Type t) {
1910 return t != null && t.tsym != null && (t.tsym.flags() & VALUE_BASED) != 0;
1911 }
1912
1913
1914 public void visitTry(JCTry tree) {
1915 // Create a new local environment with a local
1916 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
1917 try {
1918 boolean isTryWithResource = tree.resources.nonEmpty();
1919 // Create a nested environment for attributing the try block if needed
1920 Env<AttrContext> tryEnv = isTryWithResource ?
1921 env.dup(tree, localEnv.info.dup(localEnv.info.scope.dup())) :
1922 localEnv;
1923 try {
1924 // Attribute resource declarations
1925 for (JCTree resource : tree.resources) {
1926 CheckContext twrContext = new Check.NestedCheckContext(resultInfo.checkContext) {
1927 @Override
1928 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1929 chk.basicHandler.report(pos, diags.fragment(Fragments.TryNotApplicableToType(details)));
1930 }
1931 };
1932 ResultInfo twrResult =
1933 new ResultInfo(KindSelector.VAR,
1934 syms.autoCloseableType,
1935 twrContext);
1936 if (resource.hasTag(VARDEF)) {
1937 attribStat(resource, tryEnv);
1938 twrResult.check(resource, resource.type);
1939
1940 //check that resource type cannot throw InterruptedException
1941 checkAutoCloseable(resource.pos(), localEnv, resource.type);
1942
1943 VarSymbol var = ((JCVariableDecl) resource).sym;
1944
1945 var.flags_field |= Flags.FINAL;
1946 var.setData(ElementKind.RESOURCE_VARIABLE);
1947 } else {
1948 attribTree(resource, tryEnv, twrResult);
1949 }
1950 }
1951 // Attribute body
1952 attribStat(tree.body, tryEnv);
1953 } finally {
1954 if (isTryWithResource)
1955 tryEnv.info.scope.leave();
1956 }
1957
1958 // Attribute catch clauses
1959 for (List<JCCatch> l = tree.catchers; l.nonEmpty(); l = l.tail) {
1960 JCCatch c = l.head;
1961 Env<AttrContext> catchEnv =
1962 localEnv.dup(c, localEnv.info.dup(localEnv.info.scope.dup()));
1963 try {
1964 Type ctype = attribStat(c.param, catchEnv);
1965 if (TreeInfo.isMultiCatch(c)) {
1966 //multi-catch parameter is implicitly marked as final
1967 c.param.sym.flags_field |= FINAL | UNION;
1968 }
1969 if (c.param.sym.kind == VAR) {
1970 c.param.sym.setData(ElementKind.EXCEPTION_PARAMETER);
1971 }
1972 chk.checkType(c.param.vartype.pos(),
1973 chk.checkClassType(c.param.vartype.pos(), ctype),
1974 syms.throwableType);
1975 attribStat(c.body, catchEnv);
1976 } finally {
1977 catchEnv.info.scope.leave();
1978 }
1979 }
1980
1981 // Attribute finalizer
1982 if (tree.finalizer != null) attribStat(tree.finalizer, localEnv);
1983 result = null;
1984 }
1985 finally {
1986 localEnv.info.scope.leave();
1987 }
1988 }
1989
1990 void checkAutoCloseable(DiagnosticPosition pos, Env<AttrContext> env, Type resource) {
1991 if (!resource.isErroneous() &&
1992 types.asSuper(resource.referenceProjectionOrSelf(), syms.autoCloseableType.tsym) != null &&
1993 !types.isSameType(resource, syms.autoCloseableType)) { // Don't emit warning for AutoCloseable itself
1994 Symbol close = syms.noSymbol;
1995 Log.DiagnosticHandler discardHandler = new Log.DiscardDiagnosticHandler(log);
1996 try {
1997 close = rs.resolveQualifiedMethod(pos,
1998 env,
1999 types.skipTypeVars(resource, false),
2000 names.close,
2001 List.nil(),
2002 List.nil());
2003 }
2004 finally {
2005 log.popDiagnosticHandler(discardHandler);
2006 }
2007 if (close.kind == MTH &&
2008 close.overrides(syms.autoCloseableClose, resource.tsym, types, true) &&
2009 chk.isHandled(syms.interruptedExceptionType, types.memberType(resource, close).getThrownTypes()) &&
2010 env.info.lint.isEnabled(LintCategory.TRY)) {
2011 log.warning(LintCategory.TRY, pos, Warnings.TryResourceThrowsInterruptedExc(resource));
2012 }
2013 }
2014 }
2015
2016 public void visitConditional(JCConditional tree) {
2017 Type condtype = attribExpr(tree.cond, env, syms.booleanType);
2018 MatchBindings condBindings = matchBindings;
2019
2020 tree.polyKind = (pt().hasTag(NONE) && pt() != Type.recoveryType && pt() != Infer.anyPoly ||
2021 isBooleanOrNumeric(env, tree)) ?
2022 PolyKind.STANDALONE : PolyKind.POLY;
2023
2024 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) {
2025 //this means we are returning a poly conditional from void-compatible lambda expression
2026 resultInfo.checkContext.report(tree, diags.fragment(Fragments.ConditionalTargetCantBeVoid));
2027 result = tree.type = types.createErrorType(resultInfo.pt);
2028 return;
2029 }
2030
2031 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ?
2032 unknownExprInfo :
2033 resultInfo.dup(conditionalContext(resultInfo.checkContext));
2034
2035
2036 // x ? y : z
2037 // include x's bindings when true in y
2038 // include x's bindings when false in z
2039
2040 Type truetype;
2041 Env<AttrContext> trueEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
2042 try {
2043 truetype = attribTree(tree.truepart, trueEnv, condInfo);
2044 } finally {
2045 trueEnv.info.scope.leave();
2046 }
2047
2048 MatchBindings trueBindings = matchBindings;
2049
2050 Type falsetype;
2051 Env<AttrContext> falseEnv = bindingEnv(env, condBindings.bindingsWhenFalse);
2052 try {
2053 falsetype = attribTree(tree.falsepart, falseEnv, condInfo);
2054 } finally {
2055 falseEnv.info.scope.leave();
2056 }
2057
2058 MatchBindings falseBindings = matchBindings;
2059
2060 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ?
2061 condType(List.of(tree.truepart.pos(), tree.falsepart.pos()),
2062 List.of(truetype, falsetype)) : pt();
2063 if (condtype.constValue() != null &&
2064 truetype.constValue() != null &&
2065 falsetype.constValue() != null &&
2066 !owntype.hasTag(NONE)) {
2067 //constant folding
2068 owntype = cfolder.coerce(condtype.isTrue() ? truetype : falsetype, owntype);
2069 }
2070 result = check(tree, owntype, KindSelector.VAL, resultInfo);
2071 matchBindings = matchBindingsComputer.conditional(tree, condBindings, trueBindings, falseBindings);
2072 }
2073 //where
2074 private boolean isBooleanOrNumeric(Env<AttrContext> env, JCExpression tree) {
2075 switch (tree.getTag()) {
2076 case LITERAL: return ((JCLiteral)tree).typetag.isSubRangeOf(DOUBLE) ||
2077 ((JCLiteral)tree).typetag == BOOLEAN ||
2078 ((JCLiteral)tree).typetag == BOT;
2079 case LAMBDA: case REFERENCE: return false;
2080 case PARENS: return isBooleanOrNumeric(env, ((JCParens)tree).expr);
2081 case CONDEXPR:
2082 JCConditional condTree = (JCConditional)tree;
2083 return isBooleanOrNumeric(env, condTree.truepart) &&
2084 isBooleanOrNumeric(env, condTree.falsepart);
2085 case APPLY:
2086 JCMethodInvocation speculativeMethodTree =
2087 (JCMethodInvocation)deferredAttr.attribSpeculative(
2088 tree, env, unknownExprInfo,
2089 argumentAttr.withLocalCacheContext());
2090 Symbol msym = TreeInfo.symbol(speculativeMethodTree.meth);
2091 Type receiverType = speculativeMethodTree.meth.hasTag(IDENT) ?
2092 env.enclClass.type :
2093 ((JCFieldAccess)speculativeMethodTree.meth).selected.type;
2094 Type owntype = types.memberType(receiverType, msym).getReturnType();
2095 return primitiveOrBoxed(owntype);
2096 case NEWCLASS:
2097 JCExpression className =
2098 removeClassParams.translate(((JCNewClass)tree).clazz);
2099 JCExpression speculativeNewClassTree =
2100 (JCExpression)deferredAttr.attribSpeculative(
2101 className, env, unknownTypeInfo,
2102 argumentAttr.withLocalCacheContext());
2103 return primitiveOrBoxed(speculativeNewClassTree.type);
2104 default:
2105 Type speculativeType = deferredAttr.attribSpeculative(tree, env, unknownExprInfo,
2106 argumentAttr.withLocalCacheContext()).type;
2107 return primitiveOrBoxed(speculativeType);
2108 }
2109 }
2110 //where
2111 boolean primitiveOrBoxed(Type t) {
2112 return (!t.hasTag(TYPEVAR) && !t.isErroneous() && types.unboxedTypeOrType(t).isPrimitive());
2113 }
2114
2115 TreeTranslator removeClassParams = new TreeTranslator() {
2116 @Override
2117 public void visitTypeApply(JCTypeApply tree) {
2118 result = translate(tree.clazz);
2119 }
2120 };
2121
2122 CheckContext conditionalContext(CheckContext checkContext) {
2123 return new Check.NestedCheckContext(checkContext) {
2124 //this will use enclosing check context to check compatibility of
2125 //subexpression against target type; if we are in a method check context,
2126 //depending on whether boxing is allowed, we could have incompatibilities
2127 @Override
2128 public void report(DiagnosticPosition pos, JCDiagnostic details) {
2129 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleTypeInConditional(details)));
2130 }
2131 };
2132 }
2133
2134 /** Compute the type of a conditional expression, after
2135 * checking that it exists. See JLS 15.25. Does not take into
2136 * account the special case where condition and both arms
2137 * are constants.
2138 *
2139 * @param pos The source position to be used for error
2140 * diagnostics.
2141 * @param thentype The type of the expression's then-part.
2142 * @param elsetype The type of the expression's else-part.
2143 */
2144 Type condType(List<DiagnosticPosition> positions, List<Type> condTypes) {
2145 if (condTypes.isEmpty()) {
2146 return syms.objectType; //TODO: how to handle?
2147 }
2148 Type first = condTypes.head;
2149 // If same type, that is the result
2150 if (condTypes.tail.stream().allMatch(t -> types.isSameType(first, t)))
2151 return first.baseType();
2152
2153 List<Type> unboxedTypes = condTypes.stream()
2154 .map(t -> t.isPrimitive() ? t : types.unboxedType(t))
2155 .collect(List.collector());
2156
2157 // Otherwise, if both arms can be converted to a numeric
2158 // type, return the least numeric type that fits both arms
2159 // (i.e. return larger of the two, or return int if one
2160 // arm is short, the other is char).
2161 if (unboxedTypes.stream().allMatch(t -> t.isPrimitive())) {
2162 // If one arm has an integer subrange type (i.e., byte,
2163 // short, or char), and the other is an integer constant
2164 // that fits into the subrange, return the subrange type.
2165 for (Type type : unboxedTypes) {
2166 if (!type.getTag().isStrictSubRangeOf(INT)) {
2167 continue;
2168 }
2169 if (unboxedTypes.stream().filter(t -> t != type).allMatch(t -> t.hasTag(INT) && types.isAssignable(t, type)))
2170 return type.baseType();
2171 }
2172
2173 for (TypeTag tag : primitiveTags) {
2174 Type candidate = syms.typeOfTag[tag.ordinal()];
2175 if (unboxedTypes.stream().allMatch(t -> types.isSubtype(t, candidate))) {
2176 return candidate;
2177 }
2178 }
2179 }
2180
2181 // Those were all the cases that could result in a primitive. See if primitive boxing and primitive
2182 // value conversions bring about a convergence.
2183 condTypes = condTypes.stream()
2184 .map(t -> t.isPrimitive() ? types.boxedClass(t).type
2185 : t.isReferenceProjection() ? t.valueProjection() : t)
2186 .collect(List.collector());
2187
2188 for (Type type : condTypes) {
2189 if (condTypes.stream().filter(t -> t != type).allMatch(t -> types.isAssignable(t, type)))
2190 return type.baseType();
2191 }
2192
2193 Iterator<DiagnosticPosition> posIt = positions.iterator();
2194
2195 condTypes = condTypes.stream()
2196 .map(t -> chk.checkNonVoid(posIt.next(), allowPrimitiveClasses && t.isPrimitiveClass() ? t.referenceProjection() : t))
2197 .collect(List.collector());
2198
2199 // both are known to be reference types (or projections). The result is
2200 // lub(thentype,elsetype). This cannot fail, as it will
2201 // always be possible to infer "Object" if nothing better.
2202 return types.lub(condTypes.stream()
2203 .map(t -> t.baseType())
2204 .filter(t -> !t.hasTag(BOT))
2205 .collect(List.collector()));
2206 }
2207
2208 static final TypeTag[] primitiveTags = new TypeTag[]{
2209 BYTE,
2210 CHAR,
2211 SHORT,
2212 INT,
2213 LONG,
2214 FLOAT,
2215 DOUBLE,
2216 BOOLEAN,
2217 };
2218
2219 Env<AttrContext> bindingEnv(Env<AttrContext> env, List<BindingSymbol> bindings) {
2220 return bindingEnv(env, env.tree, bindings);
2221 }
2222
2223 Env<AttrContext> bindingEnv(Env<AttrContext> env, JCTree newTree, List<BindingSymbol> bindings) {
2224 Env<AttrContext> env1 = env.dup(newTree, env.info.dup(env.info.scope.dup()));
2225 bindings.forEach(env1.info.scope::enter);
2226 return env1;
2227 }
2228
2229 public void visitIf(JCIf tree) {
2230 attribExpr(tree.cond, env, syms.booleanType);
2231
2232 // if (x) { y } [ else z ]
2233 // include x's bindings when true in y
2234 // include x's bindings when false in z
2235
2236 MatchBindings condBindings = matchBindings;
2237 Env<AttrContext> thenEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
2238
2239 try {
2240 attribStat(tree.thenpart, thenEnv);
2241 } finally {
2242 thenEnv.info.scope.leave();
2243 }
2244
2245 preFlow(tree.thenpart);
2246 boolean aliveAfterThen = flow.aliveAfter(env, tree.thenpart, make);
2247 boolean aliveAfterElse;
2248
2249 if (tree.elsepart != null) {
2250 Env<AttrContext> elseEnv = bindingEnv(env, condBindings.bindingsWhenFalse);
2251 try {
2252 attribStat(tree.elsepart, elseEnv);
2253 } finally {
2254 elseEnv.info.scope.leave();
2255 }
2256 preFlow(tree.elsepart);
2257 aliveAfterElse = flow.aliveAfter(env, tree.elsepart, make);
2258 } else {
2259 aliveAfterElse = true;
2260 }
2261
2262 chk.checkEmptyIf(tree);
2263
2264 List<BindingSymbol> afterIfBindings = List.nil();
2265
2266 if (aliveAfterThen && !aliveAfterElse) {
2267 afterIfBindings = condBindings.bindingsWhenTrue;
2268 } else if (aliveAfterElse && !aliveAfterThen) {
2269 afterIfBindings = condBindings.bindingsWhenFalse;
2270 }
2271
2272 afterIfBindings.forEach(env.info.scope::enter);
2273 afterIfBindings.forEach(BindingSymbol::preserveBinding);
2274
2275 result = null;
2276 }
2277
2278 void preFlow(JCTree tree) {
2279 attrRecover.doRecovery();
2280 new PostAttrAnalyzer() {
2281 @Override
2282 public void scan(JCTree tree) {
2283 if (tree == null ||
2284 (tree.type != null &&
2285 tree.type == Type.stuckType)) {
2286 //don't touch stuck expressions!
2287 return;
2288 }
2289 super.scan(tree);
2290 }
2291
2292 @Override
2293 public void visitClassDef(JCClassDecl that) {
2294 if (that.sym != null) {
2295 // Method preFlow shouldn't visit class definitions
2296 // that have not been entered and attributed.
2297 // See JDK-8254557 and JDK-8203277 for more details.
2298 super.visitClassDef(that);
2299 }
2300 }
2301
2302 @Override
2303 public void visitLambda(JCLambda that) {
2304 if (that.type != null) {
2305 // Method preFlow shouldn't visit lambda expressions
2306 // that have not been entered and attributed.
2307 // See JDK-8254557 and JDK-8203277 for more details.
2308 super.visitLambda(that);
2309 }
2310 }
2311 }.scan(tree);
2312 }
2313
2314 public void visitExec(JCExpressionStatement tree) {
2315 //a fresh environment is required for 292 inference to work properly ---
2316 //see Infer.instantiatePolymorphicSignatureInstance()
2317 Env<AttrContext> localEnv = env.dup(tree);
2318 attribExpr(tree.expr, localEnv);
2319 result = null;
2320 }
2321
2322 public void visitBreak(JCBreak tree) {
2323 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
2324 result = null;
2325 }
2326
2327 public void visitYield(JCYield tree) {
2328 if (env.info.yieldResult != null) {
2329 attribTree(tree.value, env, env.info.yieldResult);
2330 tree.target = findJumpTarget(tree.pos(), tree.getTag(), names.empty, env);
2331 } else {
2332 log.error(tree.pos(), tree.value.hasTag(PARENS)
2333 ? Errors.NoSwitchExpressionQualify
2334 : Errors.NoSwitchExpression);
2335 attribTree(tree.value, env, unknownExprInfo);
2336 }
2337 result = null;
2338 }
2339
2340 public void visitContinue(JCContinue tree) {
2341 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
2342 result = null;
2343 }
2344 //where
2345 /** Return the target of a break, continue or yield statement,
2346 * if it exists, report an error if not.
2347 * Note: The target of a labelled break or continue is the
2348 * (non-labelled) statement tree referred to by the label,
2349 * not the tree representing the labelled statement itself.
2350 *
2351 * @param pos The position to be used for error diagnostics
2352 * @param tag The tag of the jump statement. This is either
2353 * Tree.BREAK or Tree.CONTINUE.
2354 * @param label The label of the jump statement, or null if no
2355 * label is given.
2356 * @param env The environment current at the jump statement.
2357 */
2358 private JCTree findJumpTarget(DiagnosticPosition pos,
2359 JCTree.Tag tag,
2360 Name label,
2361 Env<AttrContext> env) {
2362 Pair<JCTree, Error> jumpTarget = findJumpTargetNoError(tag, label, env);
2363
2364 if (jumpTarget.snd != null) {
2365 log.error(pos, jumpTarget.snd);
2366 }
2367
2368 return jumpTarget.fst;
2369 }
2370 /** Return the target of a break or continue statement, if it exists,
2371 * report an error if not.
2372 * Note: The target of a labelled break or continue is the
2373 * (non-labelled) statement tree referred to by the label,
2374 * not the tree representing the labelled statement itself.
2375 *
2376 * @param tag The tag of the jump statement. This is either
2377 * Tree.BREAK or Tree.CONTINUE.
2378 * @param label The label of the jump statement, or null if no
2379 * label is given.
2380 * @param env The environment current at the jump statement.
2381 */
2382 private Pair<JCTree, JCDiagnostic.Error> findJumpTargetNoError(JCTree.Tag tag,
2383 Name label,
2384 Env<AttrContext> env) {
2385 // Search environments outwards from the point of jump.
2386 Env<AttrContext> env1 = env;
2387 JCDiagnostic.Error pendingError = null;
2388 LOOP:
2389 while (env1 != null) {
2390 switch (env1.tree.getTag()) {
2391 case LABELLED:
2392 JCLabeledStatement labelled = (JCLabeledStatement)env1.tree;
2393 if (label == labelled.label) {
2394 // If jump is a continue, check that target is a loop.
2395 if (tag == CONTINUE) {
2396 if (!labelled.body.hasTag(DOLOOP) &&
2397 !labelled.body.hasTag(WHILELOOP) &&
2398 !labelled.body.hasTag(FORLOOP) &&
2399 !labelled.body.hasTag(FOREACHLOOP)) {
2400 pendingError = Errors.NotLoopLabel(label);
2401 }
2402 // Found labelled statement target, now go inwards
2403 // to next non-labelled tree.
2404 return Pair.of(TreeInfo.referencedStatement(labelled), pendingError);
2405 } else {
2406 return Pair.of(labelled, pendingError);
2407 }
2408 }
2409 break;
2410 case DOLOOP:
2411 case WHILELOOP:
2412 case FORLOOP:
2413 case FOREACHLOOP:
2414 if (label == null) return Pair.of(env1.tree, pendingError);
2415 break;
2416 case SWITCH:
2417 if (label == null && tag == BREAK) return Pair.of(env1.tree, null);
2418 break;
2419 case SWITCH_EXPRESSION:
2420 if (tag == YIELD) {
2421 return Pair.of(env1.tree, null);
2422 } else if (tag == BREAK) {
2423 pendingError = Errors.BreakOutsideSwitchExpression;
2424 } else {
2425 pendingError = Errors.ContinueOutsideSwitchExpression;
2426 }
2427 break;
2428 case LAMBDA:
2429 case METHODDEF:
2430 case CLASSDEF:
2431 break LOOP;
2432 default:
2433 }
2434 env1 = env1.next;
2435 }
2436 if (label != null)
2437 return Pair.of(null, Errors.UndefLabel(label));
2438 else if (pendingError != null)
2439 return Pair.of(null, pendingError);
2440 else if (tag == CONTINUE)
2441 return Pair.of(null, Errors.ContOutsideLoop);
2442 else
2443 return Pair.of(null, Errors.BreakOutsideSwitchLoop);
2444 }
2445
2446 public void visitReturn(JCReturn tree) {
2447 // Check that there is an enclosing method which is
2448 // nested within than the enclosing class.
2449 if (env.info.returnResult == null) {
2450 log.error(tree.pos(), Errors.RetOutsideMeth);
2451 } else if (env.info.yieldResult != null) {
2452 log.error(tree.pos(), Errors.ReturnOutsideSwitchExpression);
2453 } else if (!env.info.isLambda &&
2454 !env.info.isNewClass &&
2455 env.enclMethod != null &&
2456 TreeInfo.isCompactConstructor(env.enclMethod)) {
2457 log.error(env.enclMethod,
2458 Errors.InvalidCanonicalConstructorInRecord(Fragments.Compact, env.enclMethod.sym.name, Fragments.CanonicalCantHaveReturnStatement));
2459 } else {
2460 // Attribute return expression, if it exists, and check that
2461 // it conforms to result type of enclosing method.
2462 if (tree.expr != null) {
2463 if (env.info.returnResult.pt.hasTag(VOID)) {
2464 env.info.returnResult.checkContext.report(tree.expr.pos(),
2465 diags.fragment(Fragments.UnexpectedRetVal));
2466 }
2467 attribTree(tree.expr, env, env.info.returnResult);
2468 } else if (!env.info.returnResult.pt.hasTag(VOID) &&
2469 !env.info.returnResult.pt.hasTag(NONE)) {
2470 env.info.returnResult.checkContext.report(tree.pos(),
2471 diags.fragment(Fragments.MissingRetVal(env.info.returnResult.pt)));
2472 }
2473 }
2474 result = null;
2475 }
2476
2477 public void visitThrow(JCThrow tree) {
2478 Type owntype = attribExpr(tree.expr, env, Type.noType);
2479 chk.checkType(tree, owntype, syms.throwableType);
2480 result = null;
2481 }
2482
2483 public void visitAssert(JCAssert tree) {
2484 attribExpr(tree.cond, env, syms.booleanType);
2485 if (tree.detail != null) {
2486 chk.checkNonVoid(tree.detail.pos(), attribExpr(tree.detail, env));
2487 }
2488 result = null;
2489 }
2490
2491 /** Visitor method for method invocations.
2492 * NOTE: The method part of an application will have in its type field
2493 * the return type of the method, not the method's type itself!
2494 */
2495 public void visitApply(JCMethodInvocation tree) {
2496 // The local environment of a method application is
2497 // a new environment nested in the current one.
2498 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
2499
2500 // The types of the actual method arguments.
2501 List<Type> argtypes;
2502
2503 // The types of the actual method type arguments.
2504 List<Type> typeargtypes = null;
2505
2506 Name methName = TreeInfo.name(tree.meth);
2507
2508 boolean isConstructorCall =
2509 methName == names._this || methName == names._super;
2510
2511 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
2512 if (isConstructorCall) {
2513 // We are seeing a ...this(...) or ...super(...) call.
2514 // Check that this is the first statement in a constructor.
2515 checkFirstConstructorStat(tree, env.enclMethod, true);
2516
2517 // Record the fact
2518 // that this is a constructor call (using isSelfCall).
2519 localEnv.info.isSelfCall = true;
2520
2521 // Attribute arguments, yielding list of argument types.
2522 localEnv.info.constructorArgs = true;
2523 KindSelector kind = attribArgs(KindSelector.MTH, tree.args, localEnv, argtypesBuf);
2524 localEnv.info.constructorArgs = false;
2525 argtypes = argtypesBuf.toList();
2526 typeargtypes = attribTypes(tree.typeargs, localEnv);
2527
2528 // Variable `site' points to the class in which the called
2529 // constructor is defined.
2530 Type site = env.enclClass.sym.type;
2531 if (methName == names._super) {
2532 if (site == syms.objectType) {
2533 log.error(tree.meth.pos(), Errors.NoSuperclass(site));
2534 site = types.createErrorType(syms.objectType);
2535 } else {
2536 site = types.supertype(site);
2537 }
2538 }
2539
2540 if (site.hasTag(CLASS)) {
2541 Type encl = site.getEnclosingType();
2542 while (encl != null && encl.hasTag(TYPEVAR))
2543 encl = encl.getUpperBound();
2544 if (encl.hasTag(CLASS)) {
2545 // we are calling a nested class
2546
2547 if (tree.meth.hasTag(SELECT)) {
2548 JCTree qualifier = ((JCFieldAccess) tree.meth).selected;
2549
2550 // We are seeing a prefixed call, of the form
2551 // <expr>.super(...).
2552 // Check that the prefix expression conforms
2553 // to the outer instance type of the class.
2554 chk.checkRefType(qualifier.pos(),
2555 attribExpr(qualifier, localEnv,
2556 encl));
2557 } else if (methName == names._super) {
2558 // qualifier omitted; check for existence
2559 // of an appropriate implicit qualifier.
2560 rs.resolveImplicitThis(tree.meth.pos(),
2561 localEnv, site, true);
2562 }
2563 } else if (tree.meth.hasTag(SELECT)) {
2564 log.error(tree.meth.pos(),
2565 Errors.IllegalQualNotIcls(site.tsym));
2566 attribExpr(((JCFieldAccess) tree.meth).selected, localEnv, site);
2567 }
2568
2569 // if we're calling a java.lang.Enum constructor,
2570 // prefix the implicit String and int parameters
2571 if (site.tsym == syms.enumSym)
2572 argtypes = argtypes.prepend(syms.intType).prepend(syms.stringType);
2573
2574 // Resolve the called constructor under the assumption
2575 // that we are referring to a superclass instance of the
2576 // current instance (JLS ???).
2577 boolean selectSuperPrev = localEnv.info.selectSuper;
2578 localEnv.info.selectSuper = true;
2579 localEnv.info.pendingResolutionPhase = null;
2580 Symbol sym = rs.resolveConstructor(
2581 tree.meth.pos(), localEnv, site, argtypes, typeargtypes);
2582 localEnv.info.selectSuper = selectSuperPrev;
2583
2584 // Set method symbol to resolved constructor...
2585 TreeInfo.setSymbol(tree.meth, sym);
2586
2587 // ...and check that it is legal in the current context.
2588 // (this will also set the tree's type)
2589 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
2590 checkId(tree.meth, site, sym, localEnv,
2591 new ResultInfo(kind, mpt));
2592 } else if (site.hasTag(ERROR) && tree.meth.hasTag(SELECT)) {
2593 attribExpr(((JCFieldAccess) tree.meth).selected, localEnv, site);
2594 }
2595 // Otherwise, `site' is an error type and we do nothing
2596 result = tree.type = syms.voidType;
2597 } else {
2598 // Otherwise, we are seeing a regular method call.
2599 // Attribute the arguments, yielding list of argument types, ...
2600 KindSelector kind = attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf);
2601 argtypes = argtypesBuf.toList();
2602 typeargtypes = attribAnyTypes(tree.typeargs, localEnv);
2603
2604 // ... and attribute the method using as a prototype a methodtype
2605 // whose formal argument types is exactly the list of actual
2606 // arguments (this will also set the method symbol).
2607 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
2608 localEnv.info.pendingResolutionPhase = null;
2609 Type mtype = attribTree(tree.meth, localEnv, new ResultInfo(kind, mpt, resultInfo.checkContext));
2610
2611 // Compute the result type.
2612 Type restype = mtype.getReturnType();
2613 if (restype.hasTag(WILDCARD))
2614 throw new AssertionError(mtype);
2615
2616 Type qualifier = (tree.meth.hasTag(SELECT))
2617 ? ((JCFieldAccess) tree.meth).selected.type
2618 : env.enclClass.sym.type;
2619 Symbol msym = TreeInfo.symbol(tree.meth);
2620 restype = adjustMethodReturnType(msym, qualifier, methName, argtypes, restype);
2621
2622 chk.checkRefTypes(tree.typeargs, typeargtypes);
2623
2624 // Check that value of resulting type is admissible in the
2625 // current context. Also, capture the return type
2626 Type capturedRes = resultInfo.checkContext.inferenceContext().cachedCapture(tree, restype, true);
2627 result = check(tree, capturedRes, KindSelector.VAL, resultInfo);
2628 }
2629 chk.validate(tree.typeargs, localEnv);
2630 }
2631 //where
2632 Type adjustMethodReturnType(Symbol msym, Type qualifierType, Name methodName, List<Type> argtypes, Type restype) {
2633 if (msym != null &&
2634 (msym.owner == syms.objectType.tsym || msym.owner.isInterface()) &&
2635 methodName == names.getClass &&
2636 argtypes.isEmpty()) {
2637 // as a special case, x.getClass() has type Class<? extends |X|>
2638 // Special treatment for primitive classes: Given an expression v of type V where
2639 // V is a primitive class, v.getClass() is typed to be Class<? extends |V.ref|>
2640 Type wcb = types.erasure(allowPrimitiveClasses && qualifierType.isPrimitiveClass() ?
2641 qualifierType.referenceProjection() : qualifierType.baseType());
2642 return new ClassType(restype.getEnclosingType(),
2643 List.of(new WildcardType(wcb,
2644 BoundKind.EXTENDS,
2645 syms.boundClass)),
2646 restype.tsym,
2647 restype.getMetadata(),
2648 restype.getFlavor());
2649 } else if (msym != null &&
2650 msym.owner == syms.arrayClass &&
2651 methodName == names.clone &&
2652 types.isArray(qualifierType)) {
2653 // as a special case, array.clone() has a result that is
2654 // the same as static type of the array being cloned
2655 return qualifierType;
2656 } else {
2657 return restype;
2658 }
2659 }
2660
2661 /** Check that given application node appears as first statement
2662 * in a constructor call.
2663 * @param tree The application node
2664 * @param enclMethod The enclosing method of the application.
2665 * @param error Should an error be issued?
2666 */
2667 boolean checkFirstConstructorStat(JCMethodInvocation tree, JCMethodDecl enclMethod, boolean error) {
2668 if (enclMethod != null && names.isInitOrVNew(enclMethod.name)) {
2669 JCBlock body = enclMethod.body;
2670 if (body.stats.head.hasTag(EXEC) &&
2671 ((JCExpressionStatement) body.stats.head).expr == tree)
2672 return true;
2673 }
2674 if (error) {
2675 log.error(tree.pos(),
2676 Errors.CallMustBeFirstStmtInCtor(TreeInfo.name(tree.meth)));
2677 }
2678 return false;
2679 }
2680
2681 /** Obtain a method type with given argument types.
2682 */
2683 Type newMethodTemplate(Type restype, List<Type> argtypes, List<Type> typeargtypes) {
2684 MethodType mt = new MethodType(argtypes, restype, List.nil(), syms.methodClass);
2685 return (typeargtypes == null) ? mt : (Type)new ForAll(typeargtypes, mt);
2686 }
2687
2688 public void visitNewClass(final JCNewClass tree) {
2689 Type owntype = types.createErrorType(tree.type);
2690
2691 // The local environment of a class creation is
2692 // a new environment nested in the current one.
2693 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
2694
2695 // The anonymous inner class definition of the new expression,
2696 // if one is defined by it.
2697 JCClassDecl cdef = tree.def;
2698
2699 // If enclosing class is given, attribute it, and
2700 // complete class name to be fully qualified
2701 JCExpression clazz = tree.clazz; // Class field following new
2702 JCExpression clazzid; // Identifier in class field
2703 JCAnnotatedType annoclazzid; // Annotated type enclosing clazzid
2704 annoclazzid = null;
2705
2706 if (clazz.hasTag(TYPEAPPLY)) {
2707 clazzid = ((JCTypeApply) clazz).clazz;
2708 if (clazzid.hasTag(ANNOTATED_TYPE)) {
2709 annoclazzid = (JCAnnotatedType) clazzid;
2710 clazzid = annoclazzid.underlyingType;
2711 }
2712 } else {
2713 if (clazz.hasTag(ANNOTATED_TYPE)) {
2714 annoclazzid = (JCAnnotatedType) clazz;
2715 clazzid = annoclazzid.underlyingType;
2716 } else {
2717 clazzid = clazz;
2718 }
2719 }
2720
2721 JCExpression clazzid1 = clazzid; // The same in fully qualified form
2722
2723 if (tree.encl != null) {
2724 // We are seeing a qualified new, of the form
2725 // <expr>.new C <...> (...) ...
2726 // In this case, we let clazz stand for the name of the
2727 // allocated class C prefixed with the type of the qualifier
2728 // expression, so that we can
2729 // resolve it with standard techniques later. I.e., if
2730 // <expr> has type T, then <expr>.new C <...> (...)
2731 // yields a clazz T.C.
2732 Type encltype = chk.checkRefType(tree.encl.pos(),
2733 attribExpr(tree.encl, env));
2734 // TODO 308: in <expr>.new C, do we also want to add the type annotations
2735 // from expr to the combined type, or not? Yes, do this.
2736 clazzid1 = make.at(clazz.pos).Select(make.Type(encltype),
2737 ((JCIdent) clazzid).name);
2738
2739 EndPosTable endPosTable = this.env.toplevel.endPositions;
2740 endPosTable.storeEnd(clazzid1, clazzid.getEndPosition(endPosTable));
2741 if (clazz.hasTag(ANNOTATED_TYPE)) {
2742 JCAnnotatedType annoType = (JCAnnotatedType) clazz;
2743 List<JCAnnotation> annos = annoType.annotations;
2744
2745 if (annoType.underlyingType.hasTag(TYPEAPPLY)) {
2746 clazzid1 = make.at(tree.pos).
2747 TypeApply(clazzid1,
2748 ((JCTypeApply) clazz).arguments);
2749 }
2750
2751 clazzid1 = make.at(tree.pos).
2752 AnnotatedType(annos, clazzid1);
2753 } else if (clazz.hasTag(TYPEAPPLY)) {
2754 clazzid1 = make.at(tree.pos).
2755 TypeApply(clazzid1,
2756 ((JCTypeApply) clazz).arguments);
2757 }
2758
2759 clazz = clazzid1;
2760 }
2761
2762 // Attribute clazz expression and store
2763 // symbol + type back into the attributed tree.
2764 Type clazztype;
2765
2766 try {
2767 env.info.isNewClass = true;
2768 clazztype = TreeInfo.isEnumInit(env.tree) ?
2769 attribIdentAsEnumType(env, (JCIdent)clazz) :
2770 attribType(clazz, env);
2771 } finally {
2772 env.info.isNewClass = false;
2773 }
2774
2775 clazztype = chk.checkDiamond(tree, clazztype);
2776 chk.validate(clazz, localEnv);
2777 if (tree.encl != null) {
2778 // We have to work in this case to store
2779 // symbol + type back into the attributed tree.
2780 tree.clazz.type = clazztype;
2781 TreeInfo.setSymbol(clazzid, TreeInfo.symbol(clazzid1));
2782 clazzid.type = ((JCIdent) clazzid).sym.type;
2783 if (annoclazzid != null) {
2784 annoclazzid.type = clazzid.type;
2785 }
2786 if (!clazztype.isErroneous()) {
2787 if (cdef != null && clazztype.tsym.isInterface()) {
2788 log.error(tree.encl.pos(), Errors.AnonClassImplIntfNoQualForNew);
2789 } else if (clazztype.tsym.isStatic()) {
2790 log.error(tree.encl.pos(), Errors.QualifiedNewOfStaticClass(clazztype.tsym));
2791 }
2792 }
2793 } else if (!clazztype.tsym.isInterface() &&
2794 clazztype.getEnclosingType().hasTag(CLASS)) {
2795 // Check for the existence of an apropos outer instance
2796 rs.resolveImplicitThis(tree.pos(), env, clazztype);
2797 }
2798
2799 // Attribute constructor arguments.
2800 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
2801 final KindSelector pkind =
2802 attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf);
2803 List<Type> argtypes = argtypesBuf.toList();
2804 List<Type> typeargtypes = attribTypes(tree.typeargs, localEnv);
2805
2806 if (clazztype.hasTag(CLASS) || clazztype.hasTag(ERROR)) {
2807 // Enums may not be instantiated except implicitly
2808 if ((clazztype.tsym.flags_field & Flags.ENUM) != 0 &&
2809 (!env.tree.hasTag(VARDEF) ||
2810 (((JCVariableDecl) env.tree).mods.flags & Flags.ENUM) == 0 ||
2811 ((JCVariableDecl) env.tree).init != tree))
2812 log.error(tree.pos(), Errors.EnumCantBeInstantiated);
2813
2814 boolean isSpeculativeDiamondInferenceRound = TreeInfo.isDiamond(tree) &&
2815 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
2816 boolean skipNonDiamondPath = false;
2817 // Check that it is an instantiation of a class and not a projection type
2818 if (allowPrimitiveClasses) {
2819 if (clazz.hasTag(SELECT)) {
2820 JCFieldAccess fieldAccess = (JCFieldAccess) clazz;
2821 if (fieldAccess.selected.type.isPrimitiveClass() &&
2822 (fieldAccess.name == names.ref || fieldAccess.name == names.val)) {
2823 log.error(tree.pos(), Errors.ProjectionCantBeInstantiated);
2824 }
2825 }
2826 }
2827 // Check that class is not abstract
2828 if (cdef == null && !isSpeculativeDiamondInferenceRound && // class body may be nulled out in speculative tree copy
2829 (clazztype.tsym.flags() & (ABSTRACT | INTERFACE)) != 0) {
2830 log.error(tree.pos(),
2831 Errors.AbstractCantBeInstantiated(clazztype.tsym));
2832 skipNonDiamondPath = true;
2833 } else if (cdef != null && clazztype.tsym.isInterface()) {
2834 // Check that no constructor arguments are given to
2835 // anonymous classes implementing an interface
2836 if (!argtypes.isEmpty())
2837 log.error(tree.args.head.pos(), Errors.AnonClassImplIntfNoArgs);
2838
2839 if (!typeargtypes.isEmpty())
2840 log.error(tree.typeargs.head.pos(), Errors.AnonClassImplIntfNoTypeargs);
2841
2842 // Error recovery: pretend no arguments were supplied.
2843 argtypes = List.nil();
2844 typeargtypes = List.nil();
2845 skipNonDiamondPath = true;
2846 }
2847 if (TreeInfo.isDiamond(tree)) {
2848 ClassType site = new ClassType(clazztype.getEnclosingType(),
2849 clazztype.tsym.type.getTypeArguments(),
2850 clazztype.tsym,
2851 clazztype.getMetadata(),
2852 clazztype.getFlavor());
2853
2854 Env<AttrContext> diamondEnv = localEnv.dup(tree);
2855 diamondEnv.info.selectSuper = cdef != null || tree.classDeclRemoved();
2856 diamondEnv.info.pendingResolutionPhase = null;
2857
2858 //if the type of the instance creation expression is a class type
2859 //apply method resolution inference (JLS 15.12.2.7). The return type
2860 //of the resolved constructor will be a partially instantiated type
2861 Symbol constructor = rs.resolveDiamond(tree.pos(),
2862 diamondEnv,
2863 site,
2864 argtypes,
2865 typeargtypes);
2866 tree.constructor = constructor.baseSymbol();
2867
2868 final TypeSymbol csym = clazztype.tsym;
2869 ResultInfo diamondResult = new ResultInfo(pkind, newMethodTemplate(resultInfo.pt, argtypes, typeargtypes),
2870 diamondContext(tree, csym, resultInfo.checkContext), CheckMode.NO_TREE_UPDATE);
2871 Type constructorType = tree.constructorType = types.createErrorType(clazztype);
2872 constructorType = checkId(tree, site,
2873 constructor,
2874 diamondEnv,
2875 diamondResult);
2876
2877 tree.clazz.type = types.createErrorType(clazztype);
2878 if (!constructorType.isErroneous()) {
2879 tree.clazz.type = clazz.type = constructorType.getReturnType();
2880 tree.constructorType = types.createMethodTypeWithReturn(constructorType, syms.voidType);
2881 }
2882 clazztype = chk.checkClassType(tree.clazz, tree.clazz.type, true);
2883 }
2884
2885 // Resolve the called constructor under the assumption
2886 // that we are referring to a superclass instance of the
2887 // current instance (JLS ???).
2888 else if (!skipNonDiamondPath) {
2889 //the following code alters some of the fields in the current
2890 //AttrContext - hence, the current context must be dup'ed in
2891 //order to avoid downstream failures
2892 Env<AttrContext> rsEnv = localEnv.dup(tree);
2893 rsEnv.info.selectSuper = cdef != null;
2894 rsEnv.info.pendingResolutionPhase = null;
2895 tree.constructor = rs.resolveConstructor(
2896 tree.pos(), rsEnv, clazztype, argtypes, typeargtypes);
2897 if (cdef == null) { //do not check twice!
2898 tree.constructorType = checkId(tree,
2899 clazztype,
2900 tree.constructor,
2901 rsEnv,
2902 new ResultInfo(pkind, newMethodTemplate(syms.voidType, argtypes, typeargtypes), CheckMode.NO_TREE_UPDATE));
2903 if (rsEnv.info.lastResolveVarargs())
2904 Assert.check(tree.constructorType.isErroneous() || tree.varargsElement != null);
2905 }
2906 }
2907
2908 if (cdef != null) {
2909 visitAnonymousClassDefinition(tree, clazz, clazztype, cdef, localEnv, argtypes, typeargtypes, pkind);
2910 return;
2911 }
2912
2913 if (tree.constructor != null && tree.constructor.kind == MTH)
2914 owntype = clazztype;
2915 }
2916 result = check(tree, owntype, KindSelector.VAL, resultInfo);
2917 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
2918 if (tree.constructorType != null && inferenceContext.free(tree.constructorType)) {
2919 //we need to wait for inference to finish and then replace inference vars in the constructor type
2920 inferenceContext.addFreeTypeListener(List.of(tree.constructorType),
2921 instantiatedContext -> {
2922 tree.constructorType = instantiatedContext.asInstType(tree.constructorType);
2923 });
2924 }
2925 chk.validate(tree.typeargs, localEnv);
2926 }
2927
2928 // where
2929 private void visitAnonymousClassDefinition(JCNewClass tree, JCExpression clazz, Type clazztype,
2930 JCClassDecl cdef, Env<AttrContext> localEnv,
2931 List<Type> argtypes, List<Type> typeargtypes,
2932 KindSelector pkind) {
2933 // We are seeing an anonymous class instance creation.
2934 // In this case, the class instance creation
2935 // expression
2936 //
2937 // E.new <typeargs1>C<typargs2>(args) { ... }
2938 //
2939 // is represented internally as
2940 //
2941 // E . new <typeargs1>C<typargs2>(args) ( class <empty-name> { ... } ) .
2942 //
2943 // This expression is then *transformed* as follows:
2944 //
2945 // (1) add an extends or implements clause
2946 // (2) add a constructor.
2947 //
2948 // For instance, if C is a class, and ET is the type of E,
2949 // the expression
2950 //
2951 // E.new <typeargs1>C<typargs2>(args) { ... }
2952 //
2953 // is translated to (where X is a fresh name and typarams is the
2954 // parameter list of the super constructor):
2955 //
2956 // new <typeargs1>X(<*nullchk*>E, args) where
2957 // X extends C<typargs2> {
2958 // <typarams> X(ET e, args) {
2959 // e.<typeargs1>super(args)
2960 // }
2961 // ...
2962 // }
2963 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
2964 Type enclType = clazztype.getEnclosingType();
2965 if (enclType != null &&
2966 enclType.hasTag(CLASS) &&
2967 !chk.checkDenotable((ClassType)enclType)) {
2968 log.error(tree.encl, Errors.EnclosingClassTypeNonDenotable(enclType));
2969 }
2970 final boolean isDiamond = TreeInfo.isDiamond(tree);
2971 if (isDiamond
2972 && ((tree.constructorType != null && inferenceContext.free(tree.constructorType))
2973 || (tree.clazz.type != null && inferenceContext.free(tree.clazz.type)))) {
2974 final ResultInfo resultInfoForClassDefinition = this.resultInfo;
2975 Env<AttrContext> dupLocalEnv = copyEnv(localEnv);
2976 inferenceContext.addFreeTypeListener(List.of(tree.constructorType, tree.clazz.type),
2977 instantiatedContext -> {
2978 tree.constructorType = instantiatedContext.asInstType(tree.constructorType);
2979 tree.clazz.type = clazz.type = instantiatedContext.asInstType(clazz.type);
2980 ResultInfo prevResult = this.resultInfo;
2981 try {
2982 this.resultInfo = resultInfoForClassDefinition;
2983 visitAnonymousClassDefinition(tree, clazz, clazz.type, cdef,
2984 dupLocalEnv, argtypes, typeargtypes, pkind);
2985 } finally {
2986 this.resultInfo = prevResult;
2987 }
2988 });
2989 } else {
2990 if (isDiamond && clazztype.hasTag(CLASS)) {
2991 List<Type> invalidDiamondArgs = chk.checkDiamondDenotable((ClassType)clazztype);
2992 if (!clazztype.isErroneous() && invalidDiamondArgs.nonEmpty()) {
2993 // One or more types inferred in the previous steps is non-denotable.
2994 Fragment fragment = Diamond(clazztype.tsym);
2995 log.error(tree.clazz.pos(),
2996 Errors.CantApplyDiamond1(
2997 fragment,
2998 invalidDiamondArgs.size() > 1 ?
2999 DiamondInvalidArgs(invalidDiamondArgs, fragment) :
3000 DiamondInvalidArg(invalidDiamondArgs, fragment)));
3001 }
3002 // For <>(){}, inferred types must also be accessible.
3003 for (Type t : clazztype.getTypeArguments()) {
3004 rs.checkAccessibleType(env, t);
3005 }
3006 if (allowPrimitiveClasses) {
3007 chk.checkParameterizationByPrimitiveClass(tree, clazztype);
3008 }
3009 }
3010
3011 // If we already errored, be careful to avoid a further avalanche. ErrorType answers
3012 // false for isInterface call even when the original type is an interface.
3013 boolean implementing = clazztype.tsym.isInterface() ||
3014 clazztype.isErroneous() && !clazztype.getOriginalType().hasTag(NONE) &&
3015 clazztype.getOriginalType().tsym.isInterface();
3016
3017 if (implementing) {
3018 cdef.implementing = List.of(clazz);
3019 } else {
3020 cdef.extending = clazz;
3021 }
3022
3023 if (resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3024 rs.isSerializable(clazztype)) {
3025 localEnv.info.isSerializable = true;
3026 }
3027
3028 attribStat(cdef, localEnv);
3029
3030 List<Type> finalargtypes;
3031 // If an outer instance is given,
3032 // prefix it to the constructor arguments
3033 // and delete it from the new expression
3034 if (tree.encl != null && !clazztype.tsym.isInterface()) {
3035 finalargtypes = argtypes.prepend(tree.encl.type);
3036 } else {
3037 finalargtypes = argtypes;
3038 }
3039
3040 // Reassign clazztype and recompute constructor. As this necessarily involves
3041 // another attribution pass for deferred types in the case of <>, replicate
3042 // them. Original arguments have right decorations already.
3043 if (isDiamond && pkind.contains(KindSelector.POLY)) {
3044 finalargtypes = finalargtypes.map(deferredAttr.deferredCopier);
3045 }
3046
3047 clazztype = clazztype.hasTag(ERROR) ? types.createErrorType(cdef.sym.type)
3048 : cdef.sym.type;
3049 Symbol sym = tree.constructor = rs.resolveConstructor(
3050 tree.pos(), localEnv, clazztype, finalargtypes, typeargtypes);
3051 Assert.check(!sym.kind.isResolutionError());
3052 tree.constructor = sym;
3053 tree.constructorType = checkId(tree,
3054 clazztype,
3055 tree.constructor,
3056 localEnv,
3057 new ResultInfo(pkind, newMethodTemplate(syms.voidType, finalargtypes, typeargtypes), CheckMode.NO_TREE_UPDATE));
3058 }
3059 Type owntype = (tree.constructor != null && tree.constructor.kind == MTH) ?
3060 clazztype : types.createErrorType(tree.type);
3061 result = check(tree, owntype, KindSelector.VAL, resultInfo.dup(CheckMode.NO_INFERENCE_HOOK));
3062 chk.validate(tree.typeargs, localEnv);
3063 }
3064
3065 CheckContext diamondContext(JCNewClass clazz, TypeSymbol tsym, CheckContext checkContext) {
3066 return new Check.NestedCheckContext(checkContext) {
3067 @Override
3068 public void report(DiagnosticPosition _unused, JCDiagnostic details) {
3069 enclosingContext.report(clazz.clazz,
3070 diags.fragment(Fragments.CantApplyDiamond1(Fragments.Diamond(tsym), details)));
3071 }
3072 };
3073 }
3074
3075 /** Make an attributed null check tree.
3076 */
3077 public JCExpression makeNullCheck(JCExpression arg) {
3078 // optimization: new Outer() can never be null; skip null check
3079 if (arg.getTag() == NEWCLASS)
3080 return arg;
3081 // Likewise arg can't be null if it is a primitive class instance.
3082 if (allowPrimitiveClasses && arg.type.isPrimitiveClass())
3083 return arg;
3084 // optimization: X.this is never null; skip null check
3085 Name name = TreeInfo.name(arg);
3086 if (name == names._this || name == names._super) return arg;
3087
3088 JCTree.Tag optag = NULLCHK;
3089 JCUnary tree = make.at(arg.pos).Unary(optag, arg);
3090 tree.operator = operators.resolveUnary(arg, optag, arg.type);
3091 tree.type = arg.type;
3092 return tree;
3093 }
3094
3095 public void visitNewArray(JCNewArray tree) {
3096 Type owntype = types.createErrorType(tree.type);
3097 Env<AttrContext> localEnv = env.dup(tree);
3098 Type elemtype;
3099 if (tree.elemtype != null) {
3100 elemtype = attribType(tree.elemtype, localEnv);
3101 chk.validate(tree.elemtype, localEnv);
3102 owntype = elemtype;
3103 for (List<JCExpression> l = tree.dims; l.nonEmpty(); l = l.tail) {
3104 attribExpr(l.head, localEnv, syms.intType);
3105 owntype = new ArrayType(owntype, syms.arrayClass);
3106 }
3107 } else {
3108 // we are seeing an untyped aggregate { ... }
3109 // this is allowed only if the prototype is an array
3110 if (pt().hasTag(ARRAY)) {
3111 elemtype = types.elemtype(pt());
3112 } else {
3113 if (!pt().hasTag(ERROR) &&
3114 (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3115 log.error(tree.pos(),
3116 Errors.IllegalInitializerForType(pt()));
3117 }
3118 elemtype = types.createErrorType(pt());
3119 }
3120 }
3121 if (tree.elems != null) {
3122 attribExprs(tree.elems, localEnv, elemtype);
3123 owntype = new ArrayType(elemtype, syms.arrayClass);
3124 }
3125 if (!types.isReifiable(elemtype))
3126 log.error(tree.pos(), Errors.GenericArrayCreation);
3127 result = check(tree, owntype, KindSelector.VAL, resultInfo);
3128 }
3129
3130 /*
3131 * A lambda expression can only be attributed when a target-type is available.
3132 * In addition, if the target-type is that of a functional interface whose
3133 * descriptor contains inference variables in argument position the lambda expression
3134 * is 'stuck' (see DeferredAttr).
3135 */
3136 @Override
3137 public void visitLambda(final JCLambda that) {
3138 boolean wrongContext = false;
3139 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
3140 if (pt().hasTag(NONE) && (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3141 //lambda only allowed in assignment or method invocation/cast context
3142 log.error(that.pos(), Errors.UnexpectedLambda);
3143 }
3144 resultInfo = recoveryInfo;
3145 wrongContext = true;
3146 }
3147 //create an environment for attribution of the lambda expression
3148 final Env<AttrContext> localEnv = lambdaEnv(that, env);
3149 boolean needsRecovery =
3150 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK;
3151 try {
3152 if (needsRecovery && rs.isSerializable(pt())) {
3153 localEnv.info.isSerializable = true;
3154 localEnv.info.isSerializableLambda = true;
3155 }
3156 List<Type> explicitParamTypes = null;
3157 if (that.paramKind == JCLambda.ParameterKind.EXPLICIT) {
3158 //attribute lambda parameters
3159 attribStats(that.params, localEnv);
3160 explicitParamTypes = TreeInfo.types(that.params);
3161 }
3162
3163 TargetInfo targetInfo = getTargetInfo(that, resultInfo, explicitParamTypes);
3164 Type currentTarget = targetInfo.target;
3165 Type lambdaType = targetInfo.descriptor;
3166
3167 if (currentTarget.isErroneous()) {
3168 result = that.type = currentTarget;
3169 return;
3170 }
3171
3172 setFunctionalInfo(localEnv, that, pt(), lambdaType, currentTarget, resultInfo.checkContext);
3173
3174 if (lambdaType.hasTag(FORALL)) {
3175 //lambda expression target desc cannot be a generic method
3176 Fragment msg = Fragments.InvalidGenericLambdaTarget(lambdaType,
3177 kindName(currentTarget.tsym),
3178 currentTarget.tsym);
3179 resultInfo.checkContext.report(that, diags.fragment(msg));
3180 result = that.type = types.createErrorType(pt());
3181 return;
3182 }
3183
3184 if (that.paramKind == JCLambda.ParameterKind.IMPLICIT) {
3185 //add param type info in the AST
3186 List<Type> actuals = lambdaType.getParameterTypes();
3187 List<JCVariableDecl> params = that.params;
3188
3189 boolean arityMismatch = false;
3190
3191 while (params.nonEmpty()) {
3192 if (actuals.isEmpty()) {
3193 //not enough actuals to perform lambda parameter inference
3194 arityMismatch = true;
3195 }
3196 //reset previously set info
3197 Type argType = arityMismatch ?
3198 syms.errType :
3199 actuals.head;
3200 if (params.head.isImplicitlyTyped()) {
3201 setSyntheticVariableType(params.head, argType);
3202 }
3203 params.head.sym = null;
3204 actuals = actuals.isEmpty() ?
3205 actuals :
3206 actuals.tail;
3207 params = params.tail;
3208 }
3209
3210 //attribute lambda parameters
3211 attribStats(that.params, localEnv);
3212
3213 if (arityMismatch) {
3214 resultInfo.checkContext.report(that, diags.fragment(Fragments.IncompatibleArgTypesInLambda));
3215 result = that.type = types.createErrorType(currentTarget);
3216 return;
3217 }
3218 }
3219
3220 //from this point on, no recovery is needed; if we are in assignment context
3221 //we will be able to attribute the whole lambda body, regardless of errors;
3222 //if we are in a 'check' method context, and the lambda is not compatible
3223 //with the target-type, it will be recovered anyway in Attr.checkId
3224 needsRecovery = false;
3225
3226 ResultInfo bodyResultInfo = localEnv.info.returnResult =
3227 lambdaBodyResult(that, lambdaType, resultInfo);
3228
3229 if (that.getBodyKind() == JCLambda.BodyKind.EXPRESSION) {
3230 attribTree(that.getBody(), localEnv, bodyResultInfo);
3231 } else {
3232 JCBlock body = (JCBlock)that.body;
3233 if (body == breakTree &&
3234 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
3235 breakTreeFound(copyEnv(localEnv));
3236 }
3237 attribStats(body.stats, localEnv);
3238 }
3239
3240 result = check(that, currentTarget, KindSelector.VAL, resultInfo);
3241
3242 boolean isSpeculativeRound =
3243 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
3244
3245 preFlow(that);
3246 flow.analyzeLambda(env, that, make, isSpeculativeRound);
3247
3248 that.type = currentTarget; //avoids recovery at this stage
3249 checkLambdaCompatible(that, lambdaType, resultInfo.checkContext);
3250
3251 if (!isSpeculativeRound) {
3252 //add thrown types as bounds to the thrown types free variables if needed:
3253 if (resultInfo.checkContext.inferenceContext().free(lambdaType.getThrownTypes())) {
3254 List<Type> inferredThrownTypes = flow.analyzeLambdaThrownTypes(env, that, make);
3255 if(!checkExConstraints(inferredThrownTypes, lambdaType.getThrownTypes(), resultInfo.checkContext.inferenceContext())) {
3256 log.error(that, Errors.IncompatibleThrownTypesInMref(lambdaType.getThrownTypes()));
3257 }
3258 }
3259
3260 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), lambdaType, currentTarget);
3261 }
3262 result = wrongContext ? that.type = types.createErrorType(pt())
3263 : check(that, currentTarget, KindSelector.VAL, resultInfo);
3264 } catch (Types.FunctionDescriptorLookupError ex) {
3265 JCDiagnostic cause = ex.getDiagnostic();
3266 resultInfo.checkContext.report(that, cause);
3267 result = that.type = types.createErrorType(pt());
3268 return;
3269 } catch (CompletionFailure cf) {
3270 chk.completionError(that.pos(), cf);
3271 } catch (Throwable t) {
3272 //when an unexpected exception happens, avoid attempts to attribute the same tree again
3273 //as that would likely cause the same exception again.
3274 needsRecovery = false;
3275 throw t;
3276 } finally {
3277 localEnv.info.scope.leave();
3278 if (needsRecovery) {
3279 Type prevResult = result;
3280 try {
3281 attribTree(that, env, recoveryInfo);
3282 } finally {
3283 if (result == Type.recoveryType) {
3284 result = prevResult;
3285 }
3286 }
3287 }
3288 }
3289 }
3290 //where
3291 class TargetInfo {
3292 Type target;
3293 Type descriptor;
3294
3295 public TargetInfo(Type target, Type descriptor) {
3296 this.target = target;
3297 this.descriptor = descriptor;
3298 }
3299 }
3300
3301 TargetInfo getTargetInfo(JCPolyExpression that, ResultInfo resultInfo, List<Type> explicitParamTypes) {
3302 Type lambdaType;
3303 Type currentTarget = resultInfo.pt;
3304 if (resultInfo.pt != Type.recoveryType) {
3305 /* We need to adjust the target. If the target is an
3306 * intersection type, for example: SAM & I1 & I2 ...
3307 * the target will be updated to SAM
3308 */
3309 currentTarget = targetChecker.visit(currentTarget, that);
3310 if (!currentTarget.isIntersection()) {
3311 if (explicitParamTypes != null) {
3312 currentTarget = infer.instantiateFunctionalInterface(that,
3313 currentTarget, explicitParamTypes, resultInfo.checkContext);
3314 }
3315 currentTarget = types.removeWildcards(currentTarget);
3316 lambdaType = types.findDescriptorType(currentTarget);
3317 } else {
3318 IntersectionClassType ict = (IntersectionClassType)currentTarget;
3319 ListBuffer<Type> components = new ListBuffer<>();
3320 for (Type bound : ict.getExplicitComponents()) {
3321 if (explicitParamTypes != null) {
3322 try {
3323 bound = infer.instantiateFunctionalInterface(that,
3324 bound, explicitParamTypes, resultInfo.checkContext);
3325 } catch (FunctionDescriptorLookupError t) {
3326 // do nothing
3327 }
3328 }
3329 bound = types.removeWildcards(bound);
3330 components.add(bound);
3331 }
3332 currentTarget = types.makeIntersectionType(components.toList());
3333 currentTarget.tsym.flags_field |= INTERFACE;
3334 lambdaType = types.findDescriptorType(currentTarget);
3335 }
3336
3337 } else {
3338 currentTarget = Type.recoveryType;
3339 lambdaType = fallbackDescriptorType(that);
3340 }
3341 if (that.hasTag(LAMBDA) && lambdaType.hasTag(FORALL)) {
3342 //lambda expression target desc cannot be a generic method
3343 Fragment msg = Fragments.InvalidGenericLambdaTarget(lambdaType,
3344 kindName(currentTarget.tsym),
3345 currentTarget.tsym);
3346 resultInfo.checkContext.report(that, diags.fragment(msg));
3347 currentTarget = types.createErrorType(pt());
3348 }
3349 return new TargetInfo(currentTarget, lambdaType);
3350 }
3351
3352 void preFlow(JCLambda tree) {
3353 attrRecover.doRecovery();
3354 new PostAttrAnalyzer() {
3355 @Override
3356 public void scan(JCTree tree) {
3357 if (tree == null ||
3358 (tree.type != null &&
3359 tree.type == Type.stuckType)) {
3360 //don't touch stuck expressions!
3361 return;
3362 }
3363 super.scan(tree);
3364 }
3365
3366 @Override
3367 public void visitClassDef(JCClassDecl that) {
3368 // or class declaration trees!
3369 }
3370
3371 public void visitLambda(JCLambda that) {
3372 // or lambda expressions!
3373 }
3374 }.scan(tree.body);
3375 }
3376
3377 Types.MapVisitor<DiagnosticPosition> targetChecker = new Types.MapVisitor<DiagnosticPosition>() {
3378
3379 @Override
3380 public Type visitClassType(ClassType t, DiagnosticPosition pos) {
3381 return t.isIntersection() ?
3382 visitIntersectionClassType((IntersectionClassType)t, pos) : t;
3383 }
3384
3385 public Type visitIntersectionClassType(IntersectionClassType ict, DiagnosticPosition pos) {
3386 types.findDescriptorSymbol(makeNotionalInterface(ict, pos));
3387 return ict;
3388 }
3389
3390 private TypeSymbol makeNotionalInterface(IntersectionClassType ict, DiagnosticPosition pos) {
3391 ListBuffer<Type> targs = new ListBuffer<>();
3392 ListBuffer<Type> supertypes = new ListBuffer<>();
3393 for (Type i : ict.interfaces_field) {
3394 if (i.isParameterized()) {
3395 targs.appendList(i.tsym.type.allparams());
3396 }
3397 supertypes.append(i.tsym.type);
3398 }
3399 IntersectionClassType notionalIntf = types.makeIntersectionType(supertypes.toList());
3400 notionalIntf.allparams_field = targs.toList();
3401 notionalIntf.tsym.flags_field |= INTERFACE;
3402 return notionalIntf.tsym;
3403 }
3404 };
3405
3406 private Type fallbackDescriptorType(JCExpression tree) {
3407 switch (tree.getTag()) {
3408 case LAMBDA:
3409 JCLambda lambda = (JCLambda)tree;
3410 List<Type> argtypes = List.nil();
3411 for (JCVariableDecl param : lambda.params) {
3412 argtypes = param.vartype != null && param.vartype.type != null ?
3413 argtypes.append(param.vartype.type) :
3414 argtypes.append(syms.errType);
3415 }
3416 return new MethodType(argtypes, Type.recoveryType,
3417 List.of(syms.throwableType), syms.methodClass);
3418 case REFERENCE:
3419 return new MethodType(List.nil(), Type.recoveryType,
3420 List.of(syms.throwableType), syms.methodClass);
3421 default:
3422 Assert.error("Cannot get here!");
3423 }
3424 return null;
3425 }
3426
3427 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
3428 final InferenceContext inferenceContext, final Type... ts) {
3429 checkAccessibleTypes(pos, env, inferenceContext, List.from(ts));
3430 }
3431
3432 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
3433 final InferenceContext inferenceContext, final List<Type> ts) {
3434 if (inferenceContext.free(ts)) {
3435 inferenceContext.addFreeTypeListener(ts,
3436 solvedContext -> checkAccessibleTypes(pos, env, solvedContext, solvedContext.asInstTypes(ts)));
3437 } else {
3438 for (Type t : ts) {
3439 rs.checkAccessibleType(env, t);
3440 }
3441 }
3442 }
3443
3444 /**
3445 * Lambda/method reference have a special check context that ensures
3446 * that i.e. a lambda return type is compatible with the expected
3447 * type according to both the inherited context and the assignment
3448 * context.
3449 */
3450 class FunctionalReturnContext extends Check.NestedCheckContext {
3451
3452 FunctionalReturnContext(CheckContext enclosingContext) {
3453 super(enclosingContext);
3454 }
3455
3456 @Override
3457 public boolean compatible(Type found, Type req, Warner warn) {
3458 //return type must be compatible in both current context and assignment context
3459 return chk.basicHandler.compatible(inferenceContext().asUndetVar(found), inferenceContext().asUndetVar(req), warn);
3460 }
3461
3462 @Override
3463 public void report(DiagnosticPosition pos, JCDiagnostic details) {
3464 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleRetTypeInLambda(details)));
3465 }
3466 }
3467
3468 class ExpressionLambdaReturnContext extends FunctionalReturnContext {
3469
3470 JCExpression expr;
3471 boolean expStmtExpected;
3472
3473 ExpressionLambdaReturnContext(JCExpression expr, CheckContext enclosingContext) {
3474 super(enclosingContext);
3475 this.expr = expr;
3476 }
3477
3478 @Override
3479 public void report(DiagnosticPosition pos, JCDiagnostic details) {
3480 if (expStmtExpected) {
3481 enclosingContext.report(pos, diags.fragment(Fragments.StatExprExpected));
3482 } else {
3483 super.report(pos, details);
3484 }
3485 }
3486
3487 @Override
3488 public boolean compatible(Type found, Type req, Warner warn) {
3489 //a void return is compatible with an expression statement lambda
3490 if (req.hasTag(VOID)) {
3491 expStmtExpected = true;
3492 return TreeInfo.isExpressionStatement(expr);
3493 } else {
3494 return super.compatible(found, req, warn);
3495 }
3496 }
3497 }
3498
3499 ResultInfo lambdaBodyResult(JCLambda that, Type descriptor, ResultInfo resultInfo) {
3500 FunctionalReturnContext funcContext = that.getBodyKind() == JCLambda.BodyKind.EXPRESSION ?
3501 new ExpressionLambdaReturnContext((JCExpression)that.getBody(), resultInfo.checkContext) :
3502 new FunctionalReturnContext(resultInfo.checkContext);
3503
3504 return descriptor.getReturnType() == Type.recoveryType ?
3505 recoveryInfo :
3506 new ResultInfo(KindSelector.VAL,
3507 descriptor.getReturnType(), funcContext);
3508 }
3509
3510 /**
3511 * Lambda compatibility. Check that given return types, thrown types, parameter types
3512 * are compatible with the expected functional interface descriptor. This means that:
3513 * (i) parameter types must be identical to those of the target descriptor; (ii) return
3514 * types must be compatible with the return type of the expected descriptor.
3515 */
3516 void checkLambdaCompatible(JCLambda tree, Type descriptor, CheckContext checkContext) {
3517 Type returnType = checkContext.inferenceContext().asUndetVar(descriptor.getReturnType());
3518
3519 //return values have already been checked - but if lambda has no return
3520 //values, we must ensure that void/value compatibility is correct;
3521 //this amounts at checking that, if a lambda body can complete normally,
3522 //the descriptor's return type must be void
3523 if (tree.getBodyKind() == JCLambda.BodyKind.STATEMENT && tree.canCompleteNormally &&
3524 !returnType.hasTag(VOID) && returnType != Type.recoveryType) {
3525 Fragment msg =
3526 Fragments.IncompatibleRetTypeInLambda(Fragments.MissingRetVal(returnType));
3527 checkContext.report(tree,
3528 diags.fragment(msg));
3529 }
3530
3531 List<Type> argTypes = checkContext.inferenceContext().asUndetVars(descriptor.getParameterTypes());
3532 if (!types.isSameTypes(argTypes, TreeInfo.types(tree.params))) {
3533 checkContext.report(tree, diags.fragment(Fragments.IncompatibleArgTypesInLambda));
3534 }
3535 }
3536
3537 /* Map to hold 'fake' clinit methods. If a lambda is used to initialize a
3538 * static field and that lambda has type annotations, these annotations will
3539 * also be stored at these fake clinit methods.
3540 *
3541 * LambdaToMethod also use fake clinit methods so they can be reused.
3542 * Also as LTM is a phase subsequent to attribution, the methods from
3543 * clinits can be safely removed by LTM to save memory.
3544 */
3545 private Map<ClassSymbol, MethodSymbol> clinits = new HashMap<>();
3546
3547 public MethodSymbol removeClinit(ClassSymbol sym) {
3548 return clinits.remove(sym);
3549 }
3550
3551 /* This method returns an environment to be used to attribute a lambda
3552 * expression.
3553 *
3554 * The owner of this environment is a method symbol. If the current owner
3555 * is not a method, for example if the lambda is used to initialize
3556 * a field, then if the field is:
3557 *
3558 * - an instance field, we use the first constructor.
3559 * - a static field, we create a fake clinit method.
3560 */
3561 public Env<AttrContext> lambdaEnv(JCLambda that, Env<AttrContext> env) {
3562 Env<AttrContext> lambdaEnv;
3563 Symbol owner = env.info.scope.owner;
3564 if (owner.kind == VAR && owner.owner.kind == TYP) {
3565 //field initializer
3566 ClassSymbol enclClass = owner.enclClass();
3567 Symbol newScopeOwner = env.info.scope.owner;
3568 /* if the field isn't static, then we can get the first constructor
3569 * and use it as the owner of the environment. This is what
3570 * LTM code is doing to look for type annotations so we are fine.
3571 */
3572 if ((owner.flags() & STATIC) == 0) {
3573 Name constructorName = owner.isConcreteValueClass() ? names.vnew : names.init;
3574 for (Symbol s : enclClass.members_field.getSymbolsByName(constructorName)) {
3575 newScopeOwner = s;
3576 break;
3577 }
3578 } else {
3579 /* if the field is static then we need to create a fake clinit
3580 * method, this method can later be reused by LTM.
3581 */
3582 MethodSymbol clinit = clinits.get(enclClass);
3583 if (clinit == null) {
3584 Type clinitType = new MethodType(List.nil(),
3585 syms.voidType, List.nil(), syms.methodClass);
3586 clinit = new MethodSymbol(STATIC | SYNTHETIC | PRIVATE,
3587 names.clinit, clinitType, enclClass);
3588 clinit.params = List.nil();
3589 clinits.put(enclClass, clinit);
3590 }
3591 newScopeOwner = clinit;
3592 }
3593 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dupUnshared(newScopeOwner)));
3594 } else {
3595 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dup()));
3596 }
3597 lambdaEnv.info.yieldResult = null;
3598 lambdaEnv.info.isLambda = true;
3599 return lambdaEnv;
3600 }
3601
3602 @Override
3603 public void visitReference(final JCMemberReference that) {
3604 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
3605 if (pt().hasTag(NONE) && (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3606 //method reference only allowed in assignment or method invocation/cast context
3607 log.error(that.pos(), Errors.UnexpectedMref);
3608 }
3609 result = that.type = types.createErrorType(pt());
3610 return;
3611 }
3612 final Env<AttrContext> localEnv = env.dup(that);
3613 try {
3614 //attribute member reference qualifier - if this is a constructor
3615 //reference, the expected kind must be a type
3616 Type exprType = attribTree(that.expr, env, memberReferenceQualifierResult(that));
3617
3618 if (that.getMode() == JCMemberReference.ReferenceMode.NEW) {
3619 exprType = chk.checkConstructorRefType(that.expr, exprType);
3620 if (!exprType.isErroneous() &&
3621 exprType.isRaw() &&
3622 that.typeargs != null) {
3623 log.error(that.expr.pos(),
3624 Errors.InvalidMref(Kinds.kindName(that.getMode()),
3625 Fragments.MrefInferAndExplicitParams));
3626 exprType = types.createErrorType(exprType);
3627 }
3628 }
3629
3630 if (exprType.isErroneous()) {
3631 //if the qualifier expression contains problems,
3632 //give up attribution of method reference
3633 result = that.type = exprType;
3634 return;
3635 }
3636
3637 Symbol lhsSym = TreeInfo.symbol(that.expr);
3638 if (TreeInfo.isStaticSelector(that.expr, names)) {
3639 // TODO - a bit hacky but...
3640 if (lhsSym != null && lhsSym.isConcreteValueClass() && that.name == names.init) {
3641 that.name = names.vnew;
3642 }
3643 //if the qualifier is a type, validate it; raw warning check is
3644 //omitted as we don't know at this stage as to whether this is a
3645 //raw selector (because of inference)
3646 chk.validate(that.expr, env, false);
3647 } else {
3648 localEnv.info.selectSuper = lhsSym != null && lhsSym.name == names._super;
3649 }
3650 //attrib type-arguments
3651 List<Type> typeargtypes = List.nil();
3652 if (that.typeargs != null) {
3653 typeargtypes = attribTypes(that.typeargs, localEnv);
3654 }
3655
3656 boolean isTargetSerializable =
3657 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3658 rs.isSerializable(pt());
3659 TargetInfo targetInfo = getTargetInfo(that, resultInfo, null);
3660 Type currentTarget = targetInfo.target;
3661 Type desc = targetInfo.descriptor;
3662
3663 setFunctionalInfo(localEnv, that, pt(), desc, currentTarget, resultInfo.checkContext);
3664 List<Type> argtypes = desc.getParameterTypes();
3665 Resolve.MethodCheck referenceCheck = rs.resolveMethodCheck;
3666
3667 if (resultInfo.checkContext.inferenceContext().free(argtypes)) {
3668 referenceCheck = rs.new MethodReferenceCheck(resultInfo.checkContext.inferenceContext());
3669 }
3670
3671 Pair<Symbol, Resolve.ReferenceLookupHelper> refResult = null;
3672 List<Type> saved_undet = resultInfo.checkContext.inferenceContext().save();
3673 try {
3674 refResult = rs.resolveMemberReference(localEnv, that, that.expr.type,
3675 that.name, argtypes, typeargtypes, targetInfo.descriptor, referenceCheck,
3676 resultInfo.checkContext.inferenceContext(), rs.basicReferenceChooser);
3677 } finally {
3678 resultInfo.checkContext.inferenceContext().rollback(saved_undet);
3679 }
3680
3681 Symbol refSym = refResult.fst;
3682 Resolve.ReferenceLookupHelper lookupHelper = refResult.snd;
3683
3684 /** this switch will need to go away and be replaced by the new RESOLUTION_TARGET testing
3685 * JDK-8075541
3686 */
3687 if (refSym.kind != MTH) {
3688 boolean targetError;
3689 switch (refSym.kind) {
3690 case ABSENT_MTH:
3691 case MISSING_ENCL:
3692 targetError = false;
3693 break;
3694 case WRONG_MTH:
3695 case WRONG_MTHS:
3696 case AMBIGUOUS:
3697 case HIDDEN:
3698 case STATICERR:
3699 targetError = true;
3700 break;
3701 default:
3702 Assert.error("unexpected result kind " + refSym.kind);
3703 targetError = false;
3704 }
3705
3706 JCDiagnostic detailsDiag = ((Resolve.ResolveError)refSym.baseSymbol())
3707 .getDiagnostic(JCDiagnostic.DiagnosticType.FRAGMENT,
3708 that, exprType.tsym, exprType, that.name, argtypes, typeargtypes);
3709
3710 JCDiagnostic diag = diags.create(log.currentSource(), that,
3711 targetError ?
3712 Fragments.InvalidMref(Kinds.kindName(that.getMode()), detailsDiag) :
3713 Errors.InvalidMref(Kinds.kindName(that.getMode()), detailsDiag));
3714
3715 if (targetError && currentTarget == Type.recoveryType) {
3716 //a target error doesn't make sense during recovery stage
3717 //as we don't know what actual parameter types are
3718 result = that.type = currentTarget;
3719 return;
3720 } else {
3721 if (targetError) {
3722 resultInfo.checkContext.report(that, diag);
3723 } else {
3724 log.report(diag);
3725 }
3726 result = that.type = types.createErrorType(currentTarget);
3727 return;
3728 }
3729 }
3730
3731 that.sym = refSym.isInitOrVNew() ? refSym.baseSymbol() : refSym;
3732 that.kind = lookupHelper.referenceKind(that.sym);
3733 that.ownerAccessible = rs.isAccessible(localEnv, that.sym.enclClass());
3734
3735 if (desc.getReturnType() == Type.recoveryType) {
3736 // stop here
3737 result = that.type = currentTarget;
3738 return;
3739 }
3740
3741 if (!env.info.attributionMode.isSpeculative && that.getMode() == JCMemberReference.ReferenceMode.NEW) {
3742 Type enclosingType = exprType.getEnclosingType();
3743 if (enclosingType != null && enclosingType.hasTag(CLASS)) {
3744 // Check for the existence of an appropriate outer instance
3745 rs.resolveImplicitThis(that.pos(), env, exprType);
3746 }
3747 }
3748
3749 if (resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
3750
3751 if (that.getMode() == ReferenceMode.INVOKE &&
3752 TreeInfo.isStaticSelector(that.expr, names) &&
3753 that.kind.isUnbound() &&
3754 lookupHelper.site.isRaw()) {
3755 chk.checkRaw(that.expr, localEnv);
3756 }
3757
3758 if (that.sym.isStatic() && TreeInfo.isStaticSelector(that.expr, names) &&
3759 exprType.getTypeArguments().nonEmpty()) {
3760 //static ref with class type-args
3761 log.error(that.expr.pos(),
3762 Errors.InvalidMref(Kinds.kindName(that.getMode()),
3763 Fragments.StaticMrefWithTargs));
3764 result = that.type = types.createErrorType(currentTarget);
3765 return;
3766 }
3767
3768 if (!refSym.isStatic() && that.kind == JCMemberReference.ReferenceKind.SUPER) {
3769 // Check that super-qualified symbols are not abstract (JLS)
3770 rs.checkNonAbstract(that.pos(), that.sym);
3771 }
3772
3773 if (isTargetSerializable) {
3774 chk.checkAccessFromSerializableElement(that, true);
3775 }
3776 }
3777
3778 ResultInfo checkInfo =
3779 resultInfo.dup(newMethodTemplate(
3780 desc.getReturnType().hasTag(VOID) ? Type.noType : desc.getReturnType(),
3781 that.kind.isUnbound() ? argtypes.tail : argtypes, typeargtypes),
3782 new FunctionalReturnContext(resultInfo.checkContext), CheckMode.NO_TREE_UPDATE);
3783
3784 Type refType = checkId(that, lookupHelper.site, refSym, localEnv, checkInfo);
3785
3786 if (that.kind.isUnbound() &&
3787 resultInfo.checkContext.inferenceContext().free(argtypes.head)) {
3788 //re-generate inference constraints for unbound receiver
3789 if (!types.isSubtype(resultInfo.checkContext.inferenceContext().asUndetVar(argtypes.head), exprType)) {
3790 //cannot happen as this has already been checked - we just need
3791 //to regenerate the inference constraints, as that has been lost
3792 //as a result of the call to inferenceContext.save()
3793 Assert.error("Can't get here");
3794 }
3795 }
3796
3797 if (!refType.isErroneous()) {
3798 refType = types.createMethodTypeWithReturn(refType,
3799 adjustMethodReturnType(refSym, lookupHelper.site, that.name, checkInfo.pt.getParameterTypes(), refType.getReturnType()));
3800 }
3801
3802 //go ahead with standard method reference compatibility check - note that param check
3803 //is a no-op (as this has been taken care during method applicability)
3804 boolean isSpeculativeRound =
3805 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
3806
3807 that.type = currentTarget; //avoids recovery at this stage
3808 checkReferenceCompatible(that, desc, refType, resultInfo.checkContext, isSpeculativeRound);
3809 if (!isSpeculativeRound) {
3810 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), desc, currentTarget);
3811 }
3812 result = check(that, currentTarget, KindSelector.VAL, resultInfo);
3813 } catch (Types.FunctionDescriptorLookupError ex) {
3814 JCDiagnostic cause = ex.getDiagnostic();
3815 resultInfo.checkContext.report(that, cause);
3816 result = that.type = types.createErrorType(pt());
3817 return;
3818 }
3819 }
3820 //where
3821 ResultInfo memberReferenceQualifierResult(JCMemberReference tree) {
3822 //if this is a constructor reference, the expected kind must be a type
3823 return new ResultInfo(tree.getMode() == ReferenceMode.INVOKE ?
3824 KindSelector.VAL_TYP : KindSelector.TYP,
3825 Type.noType);
3826 }
3827
3828
3829 @SuppressWarnings("fallthrough")
3830 void checkReferenceCompatible(JCMemberReference tree, Type descriptor, Type refType, CheckContext checkContext, boolean speculativeAttr) {
3831 InferenceContext inferenceContext = checkContext.inferenceContext();
3832 Type returnType = inferenceContext.asUndetVar(descriptor.getReturnType());
3833
3834 Type resType;
3835 switch (tree.getMode()) {
3836 case NEW:
3837 if (!tree.expr.type.isRaw()) {
3838 resType = tree.expr.type;
3839 break;
3840 }
3841 default:
3842 resType = refType.getReturnType();
3843 }
3844
3845 Type incompatibleReturnType = resType;
3846
3847 if (returnType.hasTag(VOID)) {
3848 incompatibleReturnType = null;
3849 }
3850
3851 if (!returnType.hasTag(VOID) && !resType.hasTag(VOID)) {
3852 if (resType.isErroneous() ||
3853 new FunctionalReturnContext(checkContext).compatible(resType, returnType,
3854 checkContext.checkWarner(tree, resType, returnType))) {
3855 incompatibleReturnType = null;
3856 }
3857 }
3858
3859 if (incompatibleReturnType != null) {
3860 Fragment msg =
3861 Fragments.IncompatibleRetTypeInMref(Fragments.InconvertibleTypes(resType, descriptor.getReturnType()));
3862 checkContext.report(tree, diags.fragment(msg));
3863 } else {
3864 if (inferenceContext.free(refType)) {
3865 // we need to wait for inference to finish and then replace inference vars in the referent type
3866 inferenceContext.addFreeTypeListener(List.of(refType),
3867 instantiatedContext -> {
3868 tree.referentType = instantiatedContext.asInstType(refType);
3869 });
3870 } else {
3871 tree.referentType = refType;
3872 }
3873 }
3874
3875 if (!speculativeAttr) {
3876 if (!checkExConstraints(refType.getThrownTypes(), descriptor.getThrownTypes(), inferenceContext)) {
3877 log.error(tree, Errors.IncompatibleThrownTypesInMref(refType.getThrownTypes()));
3878 }
3879 }
3880 }
3881
3882 boolean checkExConstraints(
3883 List<Type> thrownByFuncExpr,
3884 List<Type> thrownAtFuncType,
3885 InferenceContext inferenceContext) {
3886 /** 18.2.5: Otherwise, let E1, ..., En be the types in the function type's throws clause that
3887 * are not proper types
3888 */
3889 List<Type> nonProperList = thrownAtFuncType.stream()
3890 .filter(e -> inferenceContext.free(e)).collect(List.collector());
3891 List<Type> properList = thrownAtFuncType.diff(nonProperList);
3892
3893 /** Let X1,...,Xm be the checked exception types that the lambda body can throw or
3894 * in the throws clause of the invocation type of the method reference's compile-time
3895 * declaration
3896 */
3897 List<Type> checkedList = thrownByFuncExpr.stream()
3898 .filter(e -> chk.isChecked(e)).collect(List.collector());
3899
3900 /** If n = 0 (the function type's throws clause consists only of proper types), then
3901 * if there exists some i (1 <= i <= m) such that Xi is not a subtype of any proper type
3902 * in the throws clause, the constraint reduces to false; otherwise, the constraint
3903 * reduces to true
3904 */
3905 ListBuffer<Type> uncaughtByProperTypes = new ListBuffer<>();
3906 for (Type checked : checkedList) {
3907 boolean isSubtype = false;
3908 for (Type proper : properList) {
3909 if (types.isSubtype(checked, proper)) {
3910 isSubtype = true;
3911 break;
3912 }
3913 }
3914 if (!isSubtype) {
3915 uncaughtByProperTypes.add(checked);
3916 }
3917 }
3918
3919 if (nonProperList.isEmpty() && !uncaughtByProperTypes.isEmpty()) {
3920 return false;
3921 }
3922
3923 /** If n > 0, the constraint reduces to a set of subtyping constraints:
3924 * for all i (1 <= i <= m), if Xi is not a subtype of any proper type in the
3925 * throws clause, then the constraints include, for all j (1 <= j <= n), <Xi <: Ej>
3926 */
3927 List<Type> nonProperAsUndet = inferenceContext.asUndetVars(nonProperList);
3928 uncaughtByProperTypes.forEach(checkedEx -> {
3929 nonProperAsUndet.forEach(nonProper -> {
3930 types.isSubtype(checkedEx, nonProper);
3931 });
3932 });
3933
3934 /** In addition, for all j (1 <= j <= n), the constraint reduces to the bound throws Ej
3935 */
3936 nonProperAsUndet.stream()
3937 .filter(t -> t.hasTag(UNDETVAR))
3938 .forEach(t -> ((UndetVar)t).setThrow());
3939 return true;
3940 }
3941
3942 /**
3943 * Set functional type info on the underlying AST. Note: as the target descriptor
3944 * might contain inference variables, we might need to register an hook in the
3945 * current inference context.
3946 */
3947 private void setFunctionalInfo(final Env<AttrContext> env, final JCFunctionalExpression fExpr,
3948 final Type pt, final Type descriptorType, final Type primaryTarget, final CheckContext checkContext) {
3949 if (checkContext.inferenceContext().free(descriptorType)) {
3950 checkContext.inferenceContext().addFreeTypeListener(List.of(pt, descriptorType),
3951 inferenceContext -> setFunctionalInfo(env, fExpr, pt, inferenceContext.asInstType(descriptorType),
3952 inferenceContext.asInstType(primaryTarget), checkContext));
3953 } else {
3954 if (pt.hasTag(CLASS)) {
3955 fExpr.target = primaryTarget;
3956 }
3957 if (checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3958 pt != Type.recoveryType) {
3959 //check that functional interface class is well-formed
3960 try {
3961 /* Types.makeFunctionalInterfaceClass() may throw an exception
3962 * when it's executed post-inference. See the listener code
3963 * above.
3964 */
3965 ClassSymbol csym = types.makeFunctionalInterfaceClass(env,
3966 names.empty, fExpr.target, ABSTRACT);
3967 if (csym != null) {
3968 chk.checkImplementations(env.tree, csym, csym);
3969 try {
3970 //perform an additional functional interface check on the synthetic class,
3971 //as there may be spurious errors for raw targets - because of existing issues
3972 //with membership and inheritance (see JDK-8074570).
3973 csym.flags_field |= INTERFACE;
3974 types.findDescriptorType(csym.type);
3975 } catch (FunctionDescriptorLookupError err) {
3976 resultInfo.checkContext.report(fExpr,
3977 diags.fragment(Fragments.NoSuitableFunctionalIntfInst(fExpr.target)));
3978 }
3979 }
3980 } catch (Types.FunctionDescriptorLookupError ex) {
3981 JCDiagnostic cause = ex.getDiagnostic();
3982 resultInfo.checkContext.report(env.tree, cause);
3983 }
3984 }
3985 }
3986 }
3987
3988 public void visitParens(JCParens tree) {
3989 Type owntype = attribTree(tree.expr, env, resultInfo);
3990 result = check(tree, owntype, pkind(), resultInfo);
3991 Symbol sym = TreeInfo.symbol(tree);
3992 if (sym != null && sym.kind.matches(KindSelector.TYP_PCK) && sym.kind != Kind.ERR)
3993 log.error(tree.pos(), Errors.IllegalParenthesizedExpression);
3994 }
3995
3996 public void visitAssign(JCAssign tree) {
3997 Type owntype = attribTree(tree.lhs, env.dup(tree), varAssignmentInfo);
3998 Type capturedType = capture(owntype);
3999 attribExpr(tree.rhs, env, owntype);
4000 result = check(tree, capturedType, KindSelector.VAL, resultInfo);
4001 }
4002
4003 public void visitAssignop(JCAssignOp tree) {
4004 // Attribute arguments.
4005 Type owntype = attribTree(tree.lhs, env, varAssignmentInfo);
4006 Type operand = attribExpr(tree.rhs, env);
4007 // Find operator.
4008 Symbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag().noAssignOp(), owntype, operand);
4009 if (operator != operators.noOpSymbol &&
4010 !owntype.isErroneous() &&
4011 !operand.isErroneous()) {
4012 chk.checkDivZero(tree.rhs.pos(), operator, operand);
4013 chk.checkCastable(tree.rhs.pos(),
4014 operator.type.getReturnType(),
4015 owntype);
4016 chk.checkLossOfPrecision(tree.rhs.pos(), operand, owntype);
4017 }
4018 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4019 }
4020
4021 public void visitUnary(JCUnary tree) {
4022 // Attribute arguments.
4023 Type argtype = (tree.getTag().isIncOrDecUnaryOp())
4024 ? attribTree(tree.arg, env, varAssignmentInfo)
4025 : chk.checkNonVoid(tree.arg.pos(), attribExpr(tree.arg, env));
4026
4027 // Find operator.
4028 OperatorSymbol operator = tree.operator = operators.resolveUnary(tree, tree.getTag(), argtype);
4029 Type owntype = types.createErrorType(tree.type);
4030 if (operator != operators.noOpSymbol &&
4031 !argtype.isErroneous()) {
4032 owntype = (tree.getTag().isIncOrDecUnaryOp())
4033 ? tree.arg.type
4034 : operator.type.getReturnType();
4035 int opc = operator.opcode;
4036
4037 // If the argument is constant, fold it.
4038 if (argtype.constValue() != null) {
4039 Type ctype = cfolder.fold1(opc, argtype);
4040 if (ctype != null) {
4041 owntype = cfolder.coerce(ctype, owntype);
4042 }
4043 }
4044 }
4045 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4046 matchBindings = matchBindingsComputer.unary(tree, matchBindings);
4047 }
4048
4049 public void visitBinary(JCBinary tree) {
4050 // Attribute arguments.
4051 Type left = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.lhs, env));
4052 // x && y
4053 // include x's bindings when true in y
4054
4055 // x || y
4056 // include x's bindings when false in y
4057
4058 MatchBindings lhsBindings = matchBindings;
4059 List<BindingSymbol> propagatedBindings;
4060 switch (tree.getTag()) {
4061 case AND:
4062 propagatedBindings = lhsBindings.bindingsWhenTrue;
4063 break;
4064 case OR:
4065 propagatedBindings = lhsBindings.bindingsWhenFalse;
4066 break;
4067 default:
4068 propagatedBindings = List.nil();
4069 break;
4070 }
4071 Env<AttrContext> rhsEnv = bindingEnv(env, propagatedBindings);
4072 Type right;
4073 try {
4074 right = chk.checkNonVoid(tree.rhs.pos(), attribExpr(tree.rhs, rhsEnv));
4075 } finally {
4076 rhsEnv.info.scope.leave();
4077 }
4078
4079 matchBindings = matchBindingsComputer.binary(tree, lhsBindings, matchBindings);
4080
4081 // Find operator.
4082 OperatorSymbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag(), left, right);
4083 Type owntype = types.createErrorType(tree.type);
4084 if (operator != operators.noOpSymbol &&
4085 !left.isErroneous() &&
4086 !right.isErroneous()) {
4087 owntype = operator.type.getReturnType();
4088 int opc = operator.opcode;
4089 // If both arguments are constants, fold them.
4090 if (left.constValue() != null && right.constValue() != null) {
4091 Type ctype = cfolder.fold2(opc, left, right);
4092 if (ctype != null) {
4093 owntype = cfolder.coerce(ctype, owntype);
4094 }
4095 }
4096
4097 // Check that argument types of a reference ==, != are
4098 // castable to each other, (JLS 15.21). Note: unboxing
4099 // comparisons will not have an acmp* opc at this point.
4100 if ((opc == ByteCodes.if_acmpeq || opc == ByteCodes.if_acmpne)) {
4101 if (!types.isCastable(left, right, new Warner(tree.pos()))) {
4102 log.error(tree.pos(), Errors.IncomparableTypes(left, right));
4103 }
4104 }
4105
4106 chk.checkDivZero(tree.rhs.pos(), operator, right);
4107 }
4108 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4109 }
4110
4111 public void visitTypeCast(final JCTypeCast tree) {
4112 Type clazztype = attribType(tree.clazz, env);
4113 chk.validate(tree.clazz, env, false);
4114 //a fresh environment is required for 292 inference to work properly ---
4115 //see Infer.instantiatePolymorphicSignatureInstance()
4116 Env<AttrContext> localEnv = env.dup(tree);
4117 //should we propagate the target type?
4118 final ResultInfo castInfo;
4119 JCExpression expr = TreeInfo.skipParens(tree.expr);
4120 boolean isPoly = (expr.hasTag(LAMBDA) || expr.hasTag(REFERENCE));
4121 if (isPoly) {
4122 //expression is a poly - we need to propagate target type info
4123 castInfo = new ResultInfo(KindSelector.VAL, clazztype,
4124 new Check.NestedCheckContext(resultInfo.checkContext) {
4125 @Override
4126 public boolean compatible(Type found, Type req, Warner warn) {
4127 return types.isCastable(found, req, warn);
4128 }
4129 });
4130 } else {
4131 //standalone cast - target-type info is not propagated
4132 castInfo = unknownExprInfo;
4133 }
4134 Type exprtype = attribTree(tree.expr, localEnv, castInfo);
4135 Type owntype = isPoly ? clazztype : chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
4136 if (exprtype.constValue() != null)
4137 owntype = cfolder.coerce(exprtype, owntype);
4138 result = check(tree, capture(owntype), KindSelector.VAL, resultInfo);
4139 if (!isPoly)
4140 chk.checkRedundantCast(localEnv, tree);
4141 }
4142
4143 public void visitTypeTest(JCInstanceOf tree) {
4144 Type exprtype = chk.checkNullOrRefType(
4145 tree.expr.pos(), attribExpr(tree.expr, env));
4146 Type clazztype;
4147 JCTree typeTree;
4148 if (tree.pattern.getTag() == BINDINGPATTERN ||
4149 tree.pattern.getTag() == PARENTHESIZEDPATTERN ||
4150 tree.pattern.getTag() == RECORDPATTERN) {
4151 attribExpr(tree.pattern, env, exprtype);
4152 clazztype = tree.pattern.type;
4153 if (types.isSubtype(exprtype, clazztype) &&
4154 !exprtype.isErroneous() && !clazztype.isErroneous() &&
4155 tree.pattern.getTag() != RECORDPATTERN) {
4156 if (!allowUnconditionalPatternsInstanceOf) {
4157 log.error(tree.pos(), Errors.InstanceofPatternNoSubtype(exprtype, clazztype));
4158 } else if (preview.isPreview(Feature.UNCONDITIONAL_PATTERN_IN_INSTANCEOF)) {
4159 preview.warnPreview(tree.pattern.pos(), Feature.UNCONDITIONAL_PATTERN_IN_INSTANCEOF);
4160 }
4161 }
4162 typeTree = TreeInfo.primaryPatternTypeTree((JCPattern) tree.pattern);
4163 } else {
4164 clazztype = attribType(tree.pattern, env);
4165 typeTree = tree.pattern;
4166 chk.validate(typeTree, env, false);
4167 }
4168 if (!clazztype.hasTag(TYPEVAR)) {
4169 clazztype = chk.checkClassOrArrayType(typeTree.pos(), clazztype);
4170 }
4171 if (!clazztype.isErroneous() && !types.isReifiable(clazztype)) {
4172 boolean valid = false;
4173 if (allowReifiableTypesInInstanceof) {
4174 valid = checkCastablePattern(tree.expr.pos(), exprtype, clazztype);
4175 } else {
4176 log.error(DiagnosticFlag.SOURCE_LEVEL, tree.pos(),
4177 Feature.REIFIABLE_TYPES_INSTANCEOF.error(this.sourceName));
4178 allowReifiableTypesInInstanceof = true;
4179 }
4180 if (!valid) {
4181 clazztype = types.createErrorType(clazztype);
4182 }
4183 }
4184 chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
4185 result = check(tree, syms.booleanType, KindSelector.VAL, resultInfo);
4186 }
4187
4188 private boolean checkCastablePattern(DiagnosticPosition pos,
4189 Type exprType,
4190 Type pattType) {
4191 Warner warner = new Warner();
4192 // if any type is erroneous, the problem is reported elsewhere
4193 if (exprType.isErroneous() || pattType.isErroneous()) {
4194 return false;
4195 }
4196 if (!types.isCastable(exprType, pattType, warner)) {
4197 chk.basicHandler.report(pos,
4198 diags.fragment(Fragments.InconvertibleTypes(exprType, pattType)));
4199 return false;
4200 } else if ((exprType.isPrimitive() || pattType.isPrimitive()) &&
4201 (!exprType.isPrimitive() ||
4202 !pattType.isPrimitive() ||
4203 !types.isSameType(exprType, pattType))) {
4204 chk.basicHandler.report(pos,
4205 diags.fragment(Fragments.NotApplicableTypes(exprType, pattType)));
4206 return false;
4207 } else if (warner.hasLint(LintCategory.UNCHECKED)) {
4208 log.error(pos,
4209 Errors.InstanceofReifiableNotSafe(exprType, pattType));
4210 return false;
4211 } else {
4212 return true;
4213 }
4214 }
4215
4216 public void visitBindingPattern(JCBindingPattern tree) {
4217 Type type;
4218 if (tree.var.vartype != null) {
4219 type = attribType(tree.var.vartype, env);
4220 } else {
4221 type = resultInfo.pt;
4222 }
4223 tree.type = tree.var.type = type;
4224 BindingSymbol v = new BindingSymbol(tree.var.mods.flags, tree.var.name, type, env.info.scope.owner);
4225 v.pos = tree.pos;
4226 tree.var.sym = v;
4227 if (chk.checkUnique(tree.var.pos(), v, env.info.scope)) {
4228 chk.checkTransparentVar(tree.var.pos(), v, env.info.scope);
4229 }
4230 if (tree.var.vartype != null) {
4231 annotate.annotateLater(tree.var.mods.annotations, env, v, tree.pos());
4232 annotate.queueScanTreeAndTypeAnnotate(tree.var.vartype, env, v, tree.var.pos());
4233 annotate.flush();
4234 }
4235 chk.validate(tree.var.vartype, env, true);
4236 result = tree.type;
4237 matchBindings = new MatchBindings(List.of(v), List.nil());
4238 }
4239
4240 @Override
4241 public void visitRecordPattern(JCRecordPattern tree) {
4242 Type type = attribType(tree.deconstructor, env);
4243 if (type.isRaw() && type.tsym.getTypeParameters().nonEmpty()) {
4244 Type inferred = infer.instantiatePatternType(resultInfo.pt, type.tsym);
4245 if (inferred == null) {
4246 log.error(tree.pos(), Errors.PatternTypeCannotInfer);
4247 } else {
4248 type = inferred;
4249 }
4250 }
4251 tree.type = tree.deconstructor.type = type;
4252 Type site = types.capture(tree.type);
4253 List<Type> expectedRecordTypes;
4254 if (site.tsym.kind == Kind.TYP && ((ClassSymbol) site.tsym).isRecord()) {
4255 ClassSymbol record = (ClassSymbol) site.tsym;
4256 expectedRecordTypes = record.getRecordComponents()
4257 .stream()
4258 .map(rc -> types.memberType(site, rc))
4259 .map(t -> types.upward(t, types.captures(t)).baseType())
4260 .collect(List.collector());
4261 tree.record = record;
4262 } else {
4263 log.error(tree.pos(), Errors.DeconstructionPatternOnlyRecords(site.tsym));
4264 expectedRecordTypes = Stream.generate(() -> types.createErrorType(tree.type))
4265 .limit(tree.nested.size())
4266 .collect(List.collector());
4267 tree.record = syms.errSymbol;
4268 }
4269 ListBuffer<BindingSymbol> outBindings = new ListBuffer<>();
4270 List<Type> recordTypes = expectedRecordTypes;
4271 List<JCPattern> nestedPatterns = tree.nested;
4272 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
4273 try {
4274 while (recordTypes.nonEmpty() && nestedPatterns.nonEmpty()) {
4275 attribExpr(nestedPatterns.head, localEnv, recordTypes.head);
4276 checkCastablePattern(nestedPatterns.head.pos(), recordTypes.head, nestedPatterns.head.type);
4277 outBindings.addAll(matchBindings.bindingsWhenTrue);
4278 matchBindings.bindingsWhenTrue.forEach(localEnv.info.scope::enter);
4279 nestedPatterns = nestedPatterns.tail;
4280 recordTypes = recordTypes.tail;
4281 }
4282 if (recordTypes.nonEmpty() || nestedPatterns.nonEmpty()) {
4283 while (nestedPatterns.nonEmpty()) {
4284 attribExpr(nestedPatterns.head, localEnv, Type.noType);
4285 nestedPatterns = nestedPatterns.tail;
4286 }
4287 List<Type> nestedTypes =
4288 tree.nested.stream().map(p -> p.type).collect(List.collector());
4289 log.error(tree.pos(),
4290 Errors.IncorrectNumberOfNestedPatterns(expectedRecordTypes,
4291 nestedTypes));
4292 }
4293 } finally {
4294 localEnv.info.scope.leave();
4295 }
4296 chk.validate(tree.deconstructor, env, true);
4297 result = tree.type;
4298 matchBindings = new MatchBindings(outBindings.toList(), List.nil());
4299 }
4300
4301 public void visitParenthesizedPattern(JCParenthesizedPattern tree) {
4302 attribExpr(tree.pattern, env);
4303 result = tree.type = tree.pattern.type;
4304 }
4305
4306 public void visitIndexed(JCArrayAccess tree) {
4307 Type owntype = types.createErrorType(tree.type);
4308 Type atype = attribExpr(tree.indexed, env);
4309 attribExpr(tree.index, env, syms.intType);
4310 if (types.isArray(atype))
4311 owntype = types.elemtype(atype);
4312 else if (!atype.hasTag(ERROR))
4313 log.error(tree.pos(), Errors.ArrayReqButFound(atype));
4314 if (!pkind().contains(KindSelector.VAL))
4315 owntype = capture(owntype);
4316 result = check(tree, owntype, KindSelector.VAR, resultInfo);
4317 }
4318
4319 public void visitIdent(JCIdent tree) {
4320 Symbol sym;
4321
4322 // Find symbol
4323 if (pt().hasTag(METHOD) || pt().hasTag(FORALL)) {
4324 // If we are looking for a method, the prototype `pt' will be a
4325 // method type with the type of the call's arguments as parameters.
4326 env.info.pendingResolutionPhase = null;
4327 sym = rs.resolveMethod(tree.pos(), env, tree.name, pt().getParameterTypes(), pt().getTypeArguments());
4328 } else if (tree.sym != null && tree.sym.kind != VAR) {
4329 sym = tree.sym;
4330 } else {
4331 sym = rs.resolveIdent(tree.pos(), env, tree.name, pkind());
4332 }
4333 tree.sym = sym;
4334
4335 // Also find the environment current for the class where
4336 // sym is defined (`symEnv').
4337 Env<AttrContext> symEnv = env;
4338 if (env.enclClass.sym.owner.kind != PCK && // we are in an inner class
4339 sym.kind.matches(KindSelector.VAL_MTH) &&
4340 sym.owner.kind == TYP &&
4341 tree.name != names._this && tree.name != names._super) {
4342
4343 // Find environment in which identifier is defined.
4344 while (symEnv.outer != null &&
4345 !sym.isMemberOf(symEnv.enclClass.sym, types)) {
4346 symEnv = symEnv.outer;
4347 }
4348 }
4349
4350 // If symbol is a variable, ...
4351 if (sym.kind == VAR) {
4352 VarSymbol v = (VarSymbol)sym;
4353
4354 // ..., evaluate its initializer, if it has one, and check for
4355 // illegal forward reference.
4356 checkInit(tree, env, v, false);
4357
4358 // If we are expecting a variable (as opposed to a value), check
4359 // that the variable is assignable in the current environment.
4360 if (KindSelector.ASG.subset(pkind()))
4361 checkAssignable(tree.pos(), v, null, env);
4362 }
4363
4364 // In a constructor body,
4365 // if symbol is a field or instance method, check that it is
4366 // not accessed before the supertype constructor is called.
4367 if (symEnv.info.isSelfCall &&
4368 sym.kind.matches(KindSelector.VAL_MTH) &&
4369 sym.owner.kind == TYP &&
4370 (sym.flags() & STATIC) == 0) {
4371 chk.earlyRefError(tree.pos(), sym.kind == VAR ?
4372 sym : thisSym(tree.pos(), env));
4373 }
4374 Env<AttrContext> env1 = env;
4375 if (sym.kind != ERR && sym.kind != TYP &&
4376 sym.owner != null && sym.owner != env1.enclClass.sym) {
4377 // If the found symbol is inaccessible, then it is
4378 // accessed through an enclosing instance. Locate this
4379 // enclosing instance:
4380 while (env1.outer != null && !rs.isAccessible(env, env1.enclClass.sym.type, sym))
4381 env1 = env1.outer;
4382 }
4383
4384 if (env.info.isSerializable) {
4385 chk.checkAccessFromSerializableElement(tree, env.info.isSerializableLambda);
4386 }
4387
4388 result = checkId(tree, env1.enclClass.sym.type, sym, env, resultInfo);
4389 }
4390
4391 public void visitSelect(JCFieldAccess tree) {
4392 // Determine the expected kind of the qualifier expression.
4393 KindSelector skind = KindSelector.NIL;
4394 if (tree.name == names._this || tree.name == names._super ||
4395 tree.name == names._class)
4396 {
4397 skind = KindSelector.TYP;
4398 } else {
4399 if (pkind().contains(KindSelector.PCK))
4400 skind = KindSelector.of(skind, KindSelector.PCK);
4401 if (pkind().contains(KindSelector.TYP))
4402 skind = KindSelector.of(skind, KindSelector.TYP, KindSelector.PCK);
4403 if (pkind().contains(KindSelector.VAL_MTH))
4404 skind = KindSelector.of(skind, KindSelector.VAL, KindSelector.TYP);
4405 }
4406
4407 // Attribute the qualifier expression, and determine its symbol (if any).
4408 Type site = attribTree(tree.selected, env, new ResultInfo(skind, Type.noType));
4409 Assert.check(site == tree.selected.type);
4410 if (allowPrimitiveClasses && tree.name == names._class && site.isPrimitiveClass()) {
4411 /* JDK-8269956: Where a reflective (class) literal is needed, the unqualified Point.class is
4412 * always the "primary" mirror - representing the primitive reference runtime type - thereby
4413 * always matching the behavior of Object::getClass
4414 */
4415 if (!tree.selected.hasTag(SELECT) || ((JCFieldAccess) tree.selected).name != names.val) {
4416 tree.selected.setType(site = site.referenceProjection());
4417 }
4418 }
4419 if (!pkind().contains(KindSelector.TYP_PCK))
4420 site = capture(site); // Capture field access
4421
4422 // don't allow T.class T[].class, etc
4423 if (skind == KindSelector.TYP) {
4424 Type elt = site;
4425 while (elt.hasTag(ARRAY))
4426 elt = ((ArrayType)elt).elemtype;
4427 if (elt.hasTag(TYPEVAR)) {
4428 log.error(tree.pos(), Errors.TypeVarCantBeDeref);
4429 result = tree.type = types.createErrorType(tree.name, site.tsym, site);
4430 tree.sym = tree.type.tsym;
4431 return;
4432 }
4433 }
4434
4435 // If qualifier symbol is a type or `super', assert `selectSuper'
4436 // for the selection. This is relevant for determining whether
4437 // protected symbols are accessible.
4438 Symbol sitesym = TreeInfo.symbol(tree.selected);
4439 boolean selectSuperPrev = env.info.selectSuper;
4440 env.info.selectSuper =
4441 sitesym != null &&
4442 sitesym.name == names._super;
4443
4444 // Determine the symbol represented by the selection.
4445 env.info.pendingResolutionPhase = null;
4446 Symbol sym = selectSym(tree, sitesym, site, env, resultInfo);
4447 if (sym.kind == VAR && sym.name != names._super && env.info.defaultSuperCallSite != null) {
4448 log.error(tree.selected.pos(), Errors.NotEnclClass(site.tsym));
4449 sym = syms.errSymbol;
4450 }
4451 if (sym.exists() && !isType(sym) && pkind().contains(KindSelector.TYP_PCK)) {
4452 site = capture(site);
4453 sym = selectSym(tree, sitesym, site, env, resultInfo);
4454 }
4455 boolean varArgs = env.info.lastResolveVarargs();
4456 tree.sym = sym;
4457
4458 if (site.hasTag(TYPEVAR) && !isType(sym) && sym.kind != ERR) {
4459 site = types.skipTypeVars(site, true);
4460 }
4461
4462 // If that symbol is a variable, ...
4463 if (sym.kind == VAR) {
4464 VarSymbol v = (VarSymbol)sym;
4465
4466 // ..., evaluate its initializer, if it has one, and check for
4467 // illegal forward reference.
4468 checkInit(tree, env, v, true);
4469
4470 // If we are expecting a variable (as opposed to a value), check
4471 // that the variable is assignable in the current environment.
4472 if (KindSelector.ASG.subset(pkind()))
4473 checkAssignable(tree.pos(), v, tree.selected, env);
4474 }
4475
4476 if (sitesym != null &&
4477 sitesym.kind == VAR &&
4478 ((VarSymbol)sitesym).isResourceVariable() &&
4479 sym.kind == MTH &&
4480 sym.name.equals(names.close) &&
4481 sym.overrides(syms.autoCloseableClose, sitesym.type.tsym, types, true) &&
4482 env.info.lint.isEnabled(LintCategory.TRY)) {
4483 log.warning(LintCategory.TRY, tree, Warnings.TryExplicitCloseCall);
4484 }
4485
4486 // Disallow selecting a type from an expression
4487 if (isType(sym) && (sitesym == null || !sitesym.kind.matches(KindSelector.TYP_PCK))) {
4488 tree.type = check(tree.selected, pt(),
4489 sitesym == null ?
4490 KindSelector.VAL : sitesym.kind.toSelector(),
4491 new ResultInfo(KindSelector.TYP_PCK, pt()));
4492 }
4493
4494 if (isType(sitesym)) {
4495 if (sym.name == names._this || sym.name == names._super) {
4496 // If `C' is the currently compiled class, check that
4497 // `C.this' does not appear in an explicit call to a constructor
4498 // also make sure that `super` is not used in constructor invocations
4499 if (env.info.isSelfCall &&
4500 ((sym.name == names._this &&
4501 site.tsym == env.enclClass.sym) ||
4502 sym.name == names._super && env.info.constructorArgs &&
4503 (sitesym.isInterface() || site.tsym == env.enclClass.sym))) {
4504 chk.earlyRefError(tree.pos(), sym);
4505 }
4506 } else {
4507 // Check if type-qualified fields or methods are static (JLS)
4508 if ((sym.flags() & STATIC) == 0 &&
4509 sym.name != names._super &&
4510 (sym.kind == VAR || sym.kind == MTH)) {
4511 rs.accessBase(rs.new StaticError(sym),
4512 tree.pos(), site, sym.name, true);
4513 }
4514 }
4515 } else if (sym.kind != ERR &&
4516 (sym.flags() & STATIC) != 0 &&
4517 sym.name != names._class) {
4518 // If the qualified item is not a type and the selected item is static, report
4519 // a warning. Make allowance for the class of an array type e.g. Object[].class)
4520 if (!sym.owner.isAnonymous()) {
4521 chk.warnStatic(tree, Warnings.StaticNotQualifiedByType(sym.kind.kindName(), sym.owner));
4522 } else {
4523 chk.warnStatic(tree, Warnings.StaticNotQualifiedByType2(sym.kind.kindName()));
4524 }
4525 }
4526
4527 // If we are selecting an instance member via a `super', ...
4528 if (env.info.selectSuper && (sym.flags() & STATIC) == 0) {
4529
4530 // Check that super-qualified symbols are not abstract (JLS)
4531 rs.checkNonAbstract(tree.pos(), sym);
4532
4533 if (site.isRaw()) {
4534 // Determine argument types for site.
4535 Type site1 = types.asSuper(env.enclClass.sym.type.referenceProjectionOrSelf(), site.tsym);
4536 if (site1 != null) site = site1;
4537 }
4538 }
4539
4540 if (env.info.isSerializable) {
4541 chk.checkAccessFromSerializableElement(tree, env.info.isSerializableLambda);
4542 }
4543
4544 env.info.selectSuper = selectSuperPrev;
4545 result = checkId(tree, site, sym, env, resultInfo);
4546 }
4547 //where
4548 /** Determine symbol referenced by a Select expression,
4549 *
4550 * @param tree The select tree.
4551 * @param site The type of the selected expression,
4552 * @param env The current environment.
4553 * @param resultInfo The current result.
4554 */
4555 private Symbol selectSym(JCFieldAccess tree,
4556 Symbol location,
4557 Type site,
4558 Env<AttrContext> env,
4559 ResultInfo resultInfo) {
4560 DiagnosticPosition pos = tree.pos();
4561 Name name = tree.name;
4562 switch (site.getTag()) {
4563 case PACKAGE:
4564 return rs.accessBase(
4565 rs.findIdentInPackage(pos, env, site.tsym, name, resultInfo.pkind),
4566 pos, location, site, name, true);
4567 case ARRAY:
4568 case CLASS:
4569 if (resultInfo.pt.hasTag(METHOD) || resultInfo.pt.hasTag(FORALL)) {
4570 return rs.resolveQualifiedMethod(
4571 pos, env, location, site, name, resultInfo.pt.getParameterTypes(), resultInfo.pt.getTypeArguments());
4572 } else if (name == names._this || name == names._super) {
4573 return rs.resolveSelf(pos, env, site.tsym, name);
4574 } else if (name == names._class) {
4575 // In this case, we have already made sure in
4576 // visitSelect that qualifier expression is a type.
4577 return syms.getClassField(site, types);
4578 } else if (allowPrimitiveClasses && site.isPrimitiveClass() && isType(location) && resultInfo.pkind.contains(KindSelector.TYP) && (name == names.ref || name == names.val)) {
4579 return site.tsym;
4580 } else {
4581 // We are seeing a plain identifier as selector.
4582 Symbol sym = rs.findIdentInType(pos, env, site, name, resultInfo.pkind);
4583 sym = rs.accessBase(sym, pos, location, site, name, true);
4584 return sym;
4585 }
4586 case WILDCARD:
4587 throw new AssertionError(tree);
4588 case TYPEVAR:
4589 // Normally, site.getUpperBound() shouldn't be null.
4590 // It should only happen during memberEnter/attribBase
4591 // when determining the supertype which *must* be
4592 // done before attributing the type variables. In
4593 // other words, we are seeing this illegal program:
4594 // class B<T> extends A<T.foo> {}
4595 Symbol sym = (site.getUpperBound() != null)
4596 ? selectSym(tree, location, capture(site.getUpperBound()), env, resultInfo)
4597 : null;
4598 if (sym == null) {
4599 log.error(pos, Errors.TypeVarCantBeDeref);
4600 return syms.errSymbol;
4601 } else {
4602 Symbol sym2 = (sym.flags() & Flags.PRIVATE) != 0 ?
4603 rs.new AccessError(env, site, sym) :
4604 sym;
4605 rs.accessBase(sym2, pos, location, site, name, true);
4606 return sym;
4607 }
4608 case ERROR:
4609 // preserve identifier names through errors
4610 return types.createErrorType(name, site.tsym, site).tsym;
4611 default:
4612 // The qualifier expression is of a primitive type -- only
4613 // .class is allowed for these.
4614 if (name == names._class) {
4615 // In this case, we have already made sure in Select that
4616 // qualifier expression is a type.
4617 return syms.getClassField(site, types);
4618 } else {
4619 log.error(pos, Errors.CantDeref(site));
4620 return syms.errSymbol;
4621 }
4622 }
4623 }
4624
4625 /** Determine type of identifier or select expression and check that
4626 * (1) the referenced symbol is not deprecated
4627 * (2) the symbol's type is safe (@see checkSafe)
4628 * (3) if symbol is a variable, check that its type and kind are
4629 * compatible with the prototype and protokind.
4630 * (4) if symbol is an instance field of a raw type,
4631 * which is being assigned to, issue an unchecked warning if its
4632 * type changes under erasure.
4633 * (5) if symbol is an instance method of a raw type, issue an
4634 * unchecked warning if its argument types change under erasure.
4635 * If checks succeed:
4636 * If symbol is a constant, return its constant type
4637 * else if symbol is a method, return its result type
4638 * otherwise return its type.
4639 * Otherwise return errType.
4640 *
4641 * @param tree The syntax tree representing the identifier
4642 * @param site If this is a select, the type of the selected
4643 * expression, otherwise the type of the current class.
4644 * @param sym The symbol representing the identifier.
4645 * @param env The current environment.
4646 * @param resultInfo The expected result
4647 */
4648 Type checkId(JCTree tree,
4649 Type site,
4650 Symbol sym,
4651 Env<AttrContext> env,
4652 ResultInfo resultInfo) {
4653 return (resultInfo.pt.hasTag(FORALL) || resultInfo.pt.hasTag(METHOD)) ?
4654 checkMethodIdInternal(tree, site, sym, env, resultInfo) :
4655 checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
4656 }
4657
4658 Type checkMethodIdInternal(JCTree tree,
4659 Type site,
4660 Symbol sym,
4661 Env<AttrContext> env,
4662 ResultInfo resultInfo) {
4663 if (resultInfo.pkind.contains(KindSelector.POLY)) {
4664 return attrRecover.recoverMethodInvocation(tree, site, sym, env, resultInfo);
4665 } else {
4666 return checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
4667 }
4668 }
4669
4670 Type checkIdInternal(JCTree tree,
4671 Type site,
4672 Symbol sym,
4673 Type pt,
4674 Env<AttrContext> env,
4675 ResultInfo resultInfo) {
4676 if (pt.isErroneous()) {
4677 return types.createErrorType(site);
4678 }
4679 Type owntype; // The computed type of this identifier occurrence.
4680 switch (sym.kind) {
4681 case TYP:
4682 // For types, the computed type equals the symbol's type,
4683 // except for three situations:
4684 owntype = sym.type;
4685 if (owntype.hasTag(CLASS)) {
4686 if (allowPrimitiveClasses) {
4687 Assert.check(owntype.getFlavor() != Flavor.X_Typeof_X);
4688 }
4689 chk.checkForBadAuxiliaryClassAccess(tree.pos(), env, (ClassSymbol)sym);
4690 Type ownOuter = owntype.getEnclosingType();
4691
4692 // (a) If symbol is a primitive class and its reference projection
4693 // is requested via the .ref notation, then adjust the computed type to
4694 // reflect this.
4695 if (allowPrimitiveClasses && owntype.isPrimitiveClass() && tree.hasTag(SELECT) && ((JCFieldAccess) tree).name == names.ref) {
4696 owntype = new ClassType(owntype.getEnclosingType(), owntype.getTypeArguments(), (TypeSymbol)sym, owntype.getMetadata(), Flavor.L_TypeOf_Q);
4697 }
4698
4699 // (b) If the symbol's type is parameterized, erase it
4700 // because no type parameters were given.
4701 // We recover generic outer type later in visitTypeApply.
4702 if (owntype.tsym.type.getTypeArguments().nonEmpty()) {
4703 owntype = types.erasure(owntype);
4704 }
4705
4706 // (c) If the symbol's type is an inner class, then
4707 // we have to interpret its outer type as a superclass
4708 // of the site type. Example:
4709 //
4710 // class Tree<A> { class Visitor { ... } }
4711 // class PointTree extends Tree<Point> { ... }
4712 // ...PointTree.Visitor...
4713 //
4714 // Then the type of the last expression above is
4715 // Tree<Point>.Visitor.
4716 else if (ownOuter.hasTag(CLASS) && site != ownOuter) {
4717 Type normOuter = site;
4718 if (normOuter.hasTag(CLASS)) {
4719 normOuter = types.asEnclosingSuper(site, ownOuter.tsym);
4720 }
4721 if (normOuter == null) // perhaps from an import
4722 normOuter = types.erasure(ownOuter);
4723 if (normOuter != ownOuter)
4724 owntype = new ClassType(
4725 normOuter, List.nil(), owntype.tsym,
4726 owntype.getMetadata(), owntype.getFlavor());
4727 }
4728 }
4729 break;
4730 case VAR:
4731 VarSymbol v = (VarSymbol)sym;
4732
4733 if (env.info.enclVar != null
4734 && v.type.hasTag(NONE)) {
4735 //self reference to implicitly typed variable declaration
4736 log.error(TreeInfo.positionFor(v, env.enclClass), Errors.CantInferLocalVarType(v.name, Fragments.LocalSelfRef));
4737 return tree.type = v.type = types.createErrorType(v.type);
4738 }
4739
4740 // Test (4): if symbol is an instance field of a raw type,
4741 // which is being assigned to, issue an unchecked warning if
4742 // its type changes under erasure.
4743 if (KindSelector.ASG.subset(pkind()) &&
4744 v.owner.kind == TYP &&
4745 (v.flags() & STATIC) == 0 &&
4746 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
4747 Type s = types.asOuterSuper(site, v.owner);
4748 if (s != null &&
4749 s.isRaw() &&
4750 !types.isSameType(v.type, v.erasure(types))) {
4751 chk.warnUnchecked(tree.pos(), Warnings.UncheckedAssignToVar(v, s));
4752 }
4753 }
4754 // The computed type of a variable is the type of the
4755 // variable symbol, taken as a member of the site type.
4756 owntype = (sym.owner.kind == TYP &&
4757 sym.name != names._this && sym.name != names._super)
4758 ? types.memberType(site, sym)
4759 : sym.type;
4760
4761 // If the variable is a constant, record constant value in
4762 // computed type.
4763 if (v.getConstValue() != null && isStaticReference(tree))
4764 owntype = owntype.constType(v.getConstValue());
4765
4766 if (resultInfo.pkind == KindSelector.VAL) {
4767 owntype = capture(owntype); // capture "names as expressions"
4768 }
4769 break;
4770 case MTH: {
4771 owntype = checkMethod(site, sym,
4772 new ResultInfo(resultInfo.pkind, resultInfo.pt.getReturnType(), resultInfo.checkContext, resultInfo.checkMode),
4773 env, TreeInfo.args(env.tree), resultInfo.pt.getParameterTypes(),
4774 resultInfo.pt.getTypeArguments());
4775 break;
4776 }
4777 case PCK: case ERR:
4778 owntype = sym.type;
4779 break;
4780 default:
4781 throw new AssertionError("unexpected kind: " + sym.kind +
4782 " in tree " + tree);
4783 }
4784
4785 // Emit a `deprecation' warning if symbol is deprecated.
4786 // (for constructors (but not for constructor references), the error
4787 // was given when the constructor was resolved)
4788
4789 if (!names.isInitOrVNew(sym.name) || tree.hasTag(REFERENCE)) {
4790 chk.checkDeprecated(tree.pos(), env.info.scope.owner, sym);
4791 chk.checkSunAPI(tree.pos(), sym);
4792 chk.checkProfile(tree.pos(), sym);
4793 chk.checkPreview(tree.pos(), env.info.scope.owner, sym);
4794 }
4795
4796 // If symbol is a variable, check that its type and
4797 // kind are compatible with the prototype and protokind.
4798 return check(tree, owntype, sym.kind.toSelector(), resultInfo);
4799 }
4800
4801 /** Check that variable is initialized and evaluate the variable's
4802 * initializer, if not yet done. Also check that variable is not
4803 * referenced before it is defined.
4804 * @param tree The tree making up the variable reference.
4805 * @param env The current environment.
4806 * @param v The variable's symbol.
4807 */
4808 private void checkInit(JCTree tree,
4809 Env<AttrContext> env,
4810 VarSymbol v,
4811 boolean onlyWarning) {
4812 // A forward reference is diagnosed if the declaration position
4813 // of the variable is greater than the current tree position
4814 // and the tree and variable definition occur in the same class
4815 // definition. Note that writes don't count as references.
4816 // This check applies only to class and instance
4817 // variables. Local variables follow different scope rules,
4818 // and are subject to definite assignment checking.
4819 Env<AttrContext> initEnv = enclosingInitEnv(env);
4820 if (initEnv != null &&
4821 (initEnv.info.enclVar == v || v.pos > tree.pos) &&
4822 v.owner.kind == TYP &&
4823 v.owner == env.info.scope.owner.enclClass() &&
4824 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env) &&
4825 (!env.tree.hasTag(ASSIGN) ||
4826 TreeInfo.skipParens(((JCAssign) env.tree).lhs) != tree)) {
4827 if (!onlyWarning || isStaticEnumField(v)) {
4828 Error errkey = (initEnv.info.enclVar == v) ?
4829 Errors.IllegalSelfRef : Errors.IllegalForwardRef;
4830 log.error(tree.pos(), errkey);
4831 } else if (useBeforeDeclarationWarning) {
4832 Warning warnkey = (initEnv.info.enclVar == v) ?
4833 Warnings.SelfRef(v) : Warnings.ForwardRef(v);
4834 log.warning(tree.pos(), warnkey);
4835 }
4836 }
4837
4838 v.getConstValue(); // ensure initializer is evaluated
4839
4840 checkEnumInitializer(tree, env, v);
4841 }
4842
4843 /**
4844 * Returns the enclosing init environment associated with this env (if any). An init env
4845 * can be either a field declaration env or a static/instance initializer env.
4846 */
4847 Env<AttrContext> enclosingInitEnv(Env<AttrContext> env) {
4848 while (true) {
4849 switch (env.tree.getTag()) {
4850 case VARDEF:
4851 JCVariableDecl vdecl = (JCVariableDecl)env.tree;
4852 if (vdecl.sym.owner.kind == TYP) {
4853 //field
4854 return env;
4855 }
4856 break;
4857 case BLOCK:
4858 if (env.next.tree.hasTag(CLASSDEF)) {
4859 //instance/static initializer
4860 return env;
4861 }
4862 break;
4863 case METHODDEF:
4864 case CLASSDEF:
4865 case TOPLEVEL:
4866 return null;
4867 }
4868 Assert.checkNonNull(env.next);
4869 env = env.next;
4870 }
4871 }
4872
4873 /**
4874 * Check for illegal references to static members of enum. In
4875 * an enum type, constructors and initializers may not
4876 * reference its static members unless they are constant.
4877 *
4878 * @param tree The tree making up the variable reference.
4879 * @param env The current environment.
4880 * @param v The variable's symbol.
4881 * @jls 8.9 Enum Types
4882 */
4883 private void checkEnumInitializer(JCTree tree, Env<AttrContext> env, VarSymbol v) {
4884 // JLS:
4885 //
4886 // "It is a compile-time error to reference a static field
4887 // of an enum type that is not a compile-time constant
4888 // (15.28) from constructors, instance initializer blocks,
4889 // or instance variable initializer expressions of that
4890 // type. It is a compile-time error for the constructors,
4891 // instance initializer blocks, or instance variable
4892 // initializer expressions of an enum constant e to refer
4893 // to itself or to an enum constant of the same type that
4894 // is declared to the right of e."
4895 if (isStaticEnumField(v)) {
4896 ClassSymbol enclClass = env.info.scope.owner.enclClass();
4897
4898 if (enclClass == null || enclClass.owner == null)
4899 return;
4900
4901 // See if the enclosing class is the enum (or a
4902 // subclass thereof) declaring v. If not, this
4903 // reference is OK.
4904 if (v.owner != enclClass && !types.isSubtype(enclClass.type, v.owner.type))
4905 return;
4906
4907 // If the reference isn't from an initializer, then
4908 // the reference is OK.
4909 if (!Resolve.isInitializer(env))
4910 return;
4911
4912 log.error(tree.pos(), Errors.IllegalEnumStaticRef);
4913 }
4914 }
4915
4916 /** Is the given symbol a static, non-constant field of an Enum?
4917 * Note: enum literals should not be regarded as such
4918 */
4919 private boolean isStaticEnumField(VarSymbol v) {
4920 return Flags.isEnum(v.owner) &&
4921 Flags.isStatic(v) &&
4922 !Flags.isConstant(v) &&
4923 v.name != names._class;
4924 }
4925
4926 /**
4927 * Check that method arguments conform to its instantiation.
4928 **/
4929 public Type checkMethod(Type site,
4930 final Symbol sym,
4931 ResultInfo resultInfo,
4932 Env<AttrContext> env,
4933 final List<JCExpression> argtrees,
4934 List<Type> argtypes,
4935 List<Type> typeargtypes) {
4936 // Test (5): if symbol is an instance method of a raw type, issue
4937 // an unchecked warning if its argument types change under erasure.
4938 if ((sym.flags() & STATIC) == 0 &&
4939 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
4940 Type s = types.asOuterSuper(site, sym.owner);
4941 if (s != null && s.isRaw() &&
4942 !types.isSameTypes(sym.type.getParameterTypes(),
4943 sym.erasure(types).getParameterTypes())) {
4944 chk.warnUnchecked(env.tree.pos(), Warnings.UncheckedCallMbrOfRawType(sym, s));
4945 }
4946 }
4947
4948 if (env.info.defaultSuperCallSite != null) {
4949 for (Type sup : types.interfaces(env.enclClass.type).prepend(types.supertype((env.enclClass.type)))) {
4950 if (!sup.tsym.isSubClass(sym.enclClass(), types) ||
4951 types.isSameType(sup, env.info.defaultSuperCallSite)) continue;
4952 List<MethodSymbol> icand_sup =
4953 types.interfaceCandidates(sup, (MethodSymbol)sym);
4954 if (icand_sup.nonEmpty() &&
4955 icand_sup.head != sym &&
4956 icand_sup.head.overrides(sym, icand_sup.head.enclClass(), types, true)) {
4957 log.error(env.tree.pos(),
4958 Errors.IllegalDefaultSuperCall(env.info.defaultSuperCallSite, Fragments.OverriddenDefault(sym, sup)));
4959 break;
4960 }
4961 }
4962 env.info.defaultSuperCallSite = null;
4963 }
4964
4965 if (sym.isStatic() && site.isInterface() && env.tree.hasTag(APPLY)) {
4966 JCMethodInvocation app = (JCMethodInvocation)env.tree;
4967 if (app.meth.hasTag(SELECT) &&
4968 !TreeInfo.isStaticSelector(((JCFieldAccess)app.meth).selected, names)) {
4969 log.error(env.tree.pos(), Errors.IllegalStaticIntfMethCall(site));
4970 }
4971 }
4972
4973 // Compute the identifier's instantiated type.
4974 // For methods, we need to compute the instance type by
4975 // Resolve.instantiate from the symbol's type as well as
4976 // any type arguments and value arguments.
4977 Warner noteWarner = new Warner();
4978 try {
4979 Type owntype = rs.checkMethod(
4980 env,
4981 site,
4982 sym,
4983 resultInfo,
4984 argtypes,
4985 typeargtypes,
4986 noteWarner);
4987
4988 DeferredAttr.DeferredTypeMap<Void> checkDeferredMap =
4989 deferredAttr.new DeferredTypeMap<>(DeferredAttr.AttrMode.CHECK, sym, env.info.pendingResolutionPhase);
4990
4991 argtypes = argtypes.map(checkDeferredMap);
4992
4993 if (noteWarner.hasNonSilentLint(LintCategory.UNCHECKED)) {
4994 chk.warnUnchecked(env.tree.pos(), Warnings.UncheckedMethInvocationApplied(kindName(sym),
4995 sym.name,
4996 rs.methodArguments(sym.type.getParameterTypes()),
4997 rs.methodArguments(argtypes.map(checkDeferredMap)),
4998 kindName(sym.location()),
4999 sym.location()));
5000 if (resultInfo.pt != Infer.anyPoly ||
5001 !owntype.hasTag(METHOD) ||
5002 !owntype.isPartial()) {
5003 //if this is not a partially inferred method type, erase return type. Otherwise,
5004 //erasure is carried out in PartiallyInferredMethodType.check().
5005 owntype = new MethodType(owntype.getParameterTypes(),
5006 types.erasure(owntype.getReturnType()),
5007 types.erasure(owntype.getThrownTypes()),
5008 syms.methodClass);
5009 }
5010 }
5011
5012 PolyKind pkind = (sym.type.hasTag(FORALL) &&
5013 sym.type.getReturnType().containsAny(((ForAll)sym.type).tvars)) ?
5014 PolyKind.POLY : PolyKind.STANDALONE;
5015 TreeInfo.setPolyKind(env.tree, pkind);
5016
5017 return (resultInfo.pt == Infer.anyPoly) ?
5018 owntype :
5019 chk.checkMethod(owntype, sym, env, argtrees, argtypes, env.info.lastResolveVarargs(),
5020 resultInfo.checkContext.inferenceContext());
5021 } catch (Infer.InferenceException ex) {
5022 //invalid target type - propagate exception outwards or report error
5023 //depending on the current check context
5024 resultInfo.checkContext.report(env.tree.pos(), ex.getDiagnostic());
5025 return types.createErrorType(site);
5026 } catch (Resolve.InapplicableMethodException ex) {
5027 final JCDiagnostic diag = ex.getDiagnostic();
5028 Resolve.InapplicableSymbolError errSym = rs.new InapplicableSymbolError(null) {
5029 @Override
5030 protected Pair<Symbol, JCDiagnostic> errCandidate() {
5031 return new Pair<>(sym, diag);
5032 }
5033 };
5034 List<Type> argtypes2 = argtypes.map(
5035 rs.new ResolveDeferredRecoveryMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase));
5036 JCDiagnostic errDiag = errSym.getDiagnostic(JCDiagnostic.DiagnosticType.ERROR,
5037 env.tree, sym, site, sym.name, argtypes2, typeargtypes);
5038 log.report(errDiag);
5039 return types.createErrorType(site);
5040 }
5041 }
5042
5043 public void visitDefaultValue(JCDefaultValue tree) {
5044 if (!allowPrimitiveClasses) {
5045 log.error(DiagnosticFlag.SOURCE_LEVEL, tree.pos(),
5046 Feature.PRIMITIVE_CLASSES.error(sourceName));
5047 }
5048
5049 // Attribute the qualifier expression, and determine its symbol (if any).
5050 Type site = attribTree(tree.clazz, env, new ResultInfo(KindSelector.TYP_PCK, Type.noType));
5051 if (!pkind().contains(KindSelector.TYP_PCK))
5052 site = capture(site); // Capture field access
5053 if (!allowPrimitiveClasses) {
5054 result = types.createErrorType(names._default, site.tsym, site);
5055 } else {
5056 Symbol sym = switch (site.getTag()) {
5057 case WILDCARD -> throw new AssertionError(tree);
5058 case PACKAGE -> {
5059 log.error(tree.pos, Errors.CantResolveLocation(Kinds.KindName.CLASS, site.tsym.getQualifiedName(), null, null,
5060 Fragments.Location(Kinds.typeKindName(env.enclClass.type), env.enclClass.type, null)));
5061 yield syms.errSymbol;
5062 }
5063 case ERROR -> types.createErrorType(names._default, site.tsym, site).tsym;
5064 default -> new VarSymbol(STATIC, names._default, site, site.tsym);
5065 };
5066
5067 if (site.hasTag(TYPEVAR) && sym.kind != ERR) {
5068 site = types.skipTypeVars(site, true);
5069 }
5070 result = checkId(tree, site, sym, env, resultInfo);
5071 }
5072 }
5073
5074 public void visitLiteral(JCLiteral tree) {
5075 result = check(tree, litType(tree.typetag).constType(tree.value),
5076 KindSelector.VAL, resultInfo);
5077 }
5078 //where
5079 /** Return the type of a literal with given type tag.
5080 */
5081 Type litType(TypeTag tag) {
5082 return (tag == CLASS) ? syms.stringType : syms.typeOfTag[tag.ordinal()];
5083 }
5084
5085 public void visitTypeIdent(JCPrimitiveTypeTree tree) {
5086 result = check(tree, syms.typeOfTag[tree.typetag.ordinal()], KindSelector.TYP, resultInfo);
5087 }
5088
5089 public void visitTypeArray(JCArrayTypeTree tree) {
5090 Type etype = attribType(tree.elemtype, env);
5091 Type type = new ArrayType(etype, syms.arrayClass);
5092 result = check(tree, type, KindSelector.TYP, resultInfo);
5093 }
5094
5095 /** Visitor method for parameterized types.
5096 * Bound checking is left until later, since types are attributed
5097 * before supertype structure is completely known
5098 */
5099 public void visitTypeApply(JCTypeApply tree) {
5100 Type owntype = types.createErrorType(tree.type);
5101
5102 // Attribute functor part of application and make sure it's a class.
5103 Type clazztype = chk.checkClassType(tree.clazz.pos(), attribType(tree.clazz, env));
5104
5105 // Attribute type parameters
5106 List<Type> actuals = attribTypes(tree.arguments, env);
5107
5108 if (clazztype.hasTag(CLASS)) {
5109 List<Type> formals = clazztype.tsym.type.getTypeArguments();
5110 if (actuals.isEmpty()) //diamond
5111 actuals = formals;
5112
5113 if (actuals.length() == formals.length()) {
5114 List<Type> a = actuals;
5115 List<Type> f = formals;
5116 while (a.nonEmpty()) {
5117 a.head = a.head.withTypeVar(f.head);
5118 a = a.tail;
5119 f = f.tail;
5120 }
5121 // Compute the proper generic outer
5122 Type clazzOuter = clazztype.getEnclosingType();
5123 if (clazzOuter.hasTag(CLASS)) {
5124 Type site;
5125 JCExpression clazz = TreeInfo.typeIn(tree.clazz);
5126 if (clazz.hasTag(IDENT)) {
5127 site = env.enclClass.sym.type;
5128 } else if (clazz.hasTag(SELECT)) {
5129 site = ((JCFieldAccess) clazz).selected.type;
5130 } else throw new AssertionError(""+tree);
5131 if (clazzOuter.hasTag(CLASS) && site != clazzOuter) {
5132 if (site.hasTag(CLASS))
5133 site = types.asOuterSuper(site, clazzOuter.tsym);
5134 if (site == null)
5135 site = types.erasure(clazzOuter);
5136 clazzOuter = site;
5137 }
5138 }
5139 owntype = new ClassType(clazzOuter, actuals, clazztype.tsym,
5140 clazztype.getMetadata(), clazztype.getFlavor());
5141 } else {
5142 if (formals.length() != 0) {
5143 log.error(tree.pos(),
5144 Errors.WrongNumberTypeArgs(Integer.toString(formals.length())));
5145 } else {
5146 log.error(tree.pos(), Errors.TypeDoesntTakeParams(clazztype.tsym));
5147 }
5148 owntype = types.createErrorType(tree.type);
5149 }
5150 }
5151 result = check(tree, owntype, KindSelector.TYP, resultInfo);
5152 }
5153
5154 public void visitTypeUnion(JCTypeUnion tree) {
5155 ListBuffer<Type> multicatchTypes = new ListBuffer<>();
5156 ListBuffer<Type> all_multicatchTypes = null; // lazy, only if needed
5157 for (JCExpression typeTree : tree.alternatives) {
5158 Type ctype = attribType(typeTree, env);
5159 ctype = chk.checkType(typeTree.pos(),
5160 chk.checkClassType(typeTree.pos(), ctype),
5161 syms.throwableType);
5162 if (!ctype.isErroneous()) {
5163 //check that alternatives of a union type are pairwise
5164 //unrelated w.r.t. subtyping
5165 if (chk.intersects(ctype, multicatchTypes.toList())) {
5166 for (Type t : multicatchTypes) {
5167 boolean sub = types.isSubtype(ctype, t);
5168 boolean sup = types.isSubtype(t, ctype);
5169 if (sub || sup) {
5170 //assume 'a' <: 'b'
5171 Type a = sub ? ctype : t;
5172 Type b = sub ? t : ctype;
5173 log.error(typeTree.pos(), Errors.MulticatchTypesMustBeDisjoint(a, b));
5174 }
5175 }
5176 }
5177 multicatchTypes.append(ctype);
5178 if (all_multicatchTypes != null)
5179 all_multicatchTypes.append(ctype);
5180 } else {
5181 if (all_multicatchTypes == null) {
5182 all_multicatchTypes = new ListBuffer<>();
5183 all_multicatchTypes.appendList(multicatchTypes);
5184 }
5185 all_multicatchTypes.append(ctype);
5186 }
5187 }
5188 Type t = check(tree, types.lub(multicatchTypes.toList()),
5189 KindSelector.TYP, resultInfo.dup(CheckMode.NO_TREE_UPDATE));
5190 if (t.hasTag(CLASS)) {
5191 List<Type> alternatives =
5192 ((all_multicatchTypes == null) ? multicatchTypes : all_multicatchTypes).toList();
5193 t = new UnionClassType((ClassType) t, alternatives);
5194 }
5195 tree.type = result = t;
5196 }
5197
5198 public void visitTypeIntersection(JCTypeIntersection tree) {
5199 attribTypes(tree.bounds, env);
5200 tree.type = result = checkIntersection(tree, tree.bounds);
5201 }
5202
5203 public void visitTypeParameter(JCTypeParameter tree) {
5204 TypeVar typeVar = (TypeVar) tree.type;
5205
5206 if (tree.annotations != null && tree.annotations.nonEmpty()) {
5207 annotate.annotateTypeParameterSecondStage(tree, tree.annotations);
5208 }
5209
5210 if (!typeVar.getUpperBound().isErroneous()) {
5211 //fixup type-parameter bound computed in 'attribTypeVariables'
5212 typeVar.setUpperBound(checkIntersection(tree, tree.bounds));
5213 }
5214 }
5215
5216 Type checkIntersection(JCTree tree, List<JCExpression> bounds) {
5217 Set<Type> boundSet = new HashSet<>();
5218 if (bounds.nonEmpty()) {
5219 // accept class or interface or typevar as first bound.
5220 bounds.head.type = checkBase(bounds.head.type, bounds.head, env, false, false, false);
5221 boundSet.add(types.erasure(bounds.head.type));
5222 if (bounds.head.type.isErroneous()) {
5223 return bounds.head.type;
5224 }
5225 else if (bounds.head.type.hasTag(TYPEVAR)) {
5226 // if first bound was a typevar, do not accept further bounds.
5227 if (bounds.tail.nonEmpty()) {
5228 log.error(bounds.tail.head.pos(),
5229 Errors.TypeVarMayNotBeFollowedByOtherBounds);
5230 return bounds.head.type;
5231 }
5232 } else {
5233 // if first bound was a class or interface, accept only interfaces
5234 // as further bounds.
5235 for (JCExpression bound : bounds.tail) {
5236 bound.type = checkBase(bound.type, bound, env, false, true, false);
5237 if (bound.type.isErroneous()) {
5238 bounds = List.of(bound);
5239 }
5240 else if (bound.type.hasTag(CLASS)) {
5241 chk.checkNotRepeated(bound.pos(), types.erasure(bound.type), boundSet);
5242 }
5243 }
5244 }
5245 }
5246
5247 if (bounds.length() == 0) {
5248 return syms.objectType;
5249 } else if (bounds.length() == 1) {
5250 return bounds.head.type;
5251 } else {
5252 Type owntype = types.makeIntersectionType(TreeInfo.types(bounds));
5253 // ... the variable's bound is a class type flagged COMPOUND
5254 // (see comment for TypeVar.bound).
5255 // In this case, generate a class tree that represents the
5256 // bound class, ...
5257 JCExpression extending;
5258 List<JCExpression> implementing;
5259 if (!bounds.head.type.isInterface()) {
5260 extending = bounds.head;
5261 implementing = bounds.tail;
5262 } else {
5263 extending = null;
5264 implementing = bounds;
5265 }
5266 JCClassDecl cd = make.at(tree).ClassDef(
5267 make.Modifiers(PUBLIC | ABSTRACT | (extending != null && TreeInfo.symbol(extending).isPrimitiveClass() ? PRIMITIVE_CLASS : 0)),
5268 names.empty, List.nil(),
5269 extending, implementing, List.nil());
5270
5271 ClassSymbol c = (ClassSymbol)owntype.tsym;
5272 Assert.check((c.flags() & COMPOUND) != 0);
5273 cd.sym = c;
5274 c.sourcefile = env.toplevel.sourcefile;
5275
5276 // ... and attribute the bound class
5277 c.flags_field |= UNATTRIBUTED;
5278 Env<AttrContext> cenv = enter.classEnv(cd, env);
5279 typeEnvs.put(c, cenv);
5280 attribClass(c);
5281 return owntype;
5282 }
5283 }
5284
5285 public void visitWildcard(JCWildcard tree) {
5286 //- System.err.println("visitWildcard("+tree+");");//DEBUG
5287 Type type = (tree.kind.kind == BoundKind.UNBOUND)
5288 ? syms.objectType
5289 : attribType(tree.inner, env);
5290 result = check(tree, new WildcardType(chk.checkRefType(tree.pos(), type, false),
5291 tree.kind.kind,
5292 syms.boundClass),
5293 KindSelector.TYP, resultInfo);
5294 }
5295
5296 public void visitAnnotation(JCAnnotation tree) {
5297 Assert.error("should be handled in annotate");
5298 }
5299
5300 @Override
5301 public void visitModifiers(JCModifiers tree) {
5302 //error recovery only:
5303 Assert.check(resultInfo.pkind == KindSelector.ERR);
5304
5305 attribAnnotationTypes(tree.annotations, env);
5306 }
5307
5308 public void visitAnnotatedType(JCAnnotatedType tree) {
5309 attribAnnotationTypes(tree.annotations, env);
5310 Type underlyingType = attribType(tree.underlyingType, env);
5311 Type annotatedType = underlyingType.annotatedType(Annotations.TO_BE_SET);
5312
5313 if (!env.info.isNewClass)
5314 annotate.annotateTypeSecondStage(tree, tree.annotations, annotatedType);
5315 result = tree.type = annotatedType;
5316 }
5317
5318 public void visitErroneous(JCErroneous tree) {
5319 if (tree.errs != null) {
5320 Env<AttrContext> errEnv = env.dup(env.tree);
5321 errEnv.info.returnResult = unknownExprInfo;
5322 for (JCTree err : tree.errs)
5323 attribTree(err, errEnv, new ResultInfo(KindSelector.ERR, pt()));
5324 }
5325 result = tree.type = syms.errType;
5326 }
5327
5328 /** Default visitor method for all other trees.
5329 */
5330 public void visitTree(JCTree tree) {
5331 throw new AssertionError();
5332 }
5333
5334 /**
5335 * Attribute an env for either a top level tree or class or module declaration.
5336 */
5337 public void attrib(Env<AttrContext> env) {
5338 switch (env.tree.getTag()) {
5339 case MODULEDEF:
5340 attribModule(env.tree.pos(), ((JCModuleDecl)env.tree).sym);
5341 break;
5342 case PACKAGEDEF:
5343 attribPackage(env.tree.pos(), ((JCPackageDecl) env.tree).packge);
5344 break;
5345 default:
5346 attribClass(env.tree.pos(), env.enclClass.sym);
5347 }
5348 }
5349
5350 public void attribPackage(DiagnosticPosition pos, PackageSymbol p) {
5351 try {
5352 annotate.flush();
5353 attribPackage(p);
5354 } catch (CompletionFailure ex) {
5355 chk.completionError(pos, ex);
5356 }
5357 }
5358
5359 void attribPackage(PackageSymbol p) {
5360 attribWithLint(p,
5361 env -> chk.checkDeprecatedAnnotation(((JCPackageDecl) env.tree).pid.pos(), p));
5362 }
5363
5364 public void attribModule(DiagnosticPosition pos, ModuleSymbol m) {
5365 try {
5366 annotate.flush();
5367 attribModule(m);
5368 } catch (CompletionFailure ex) {
5369 chk.completionError(pos, ex);
5370 }
5371 }
5372
5373 void attribModule(ModuleSymbol m) {
5374 attribWithLint(m, env -> attribStat(env.tree, env));
5375 }
5376
5377 private void attribWithLint(TypeSymbol sym, Consumer<Env<AttrContext>> attrib) {
5378 Env<AttrContext> env = typeEnvs.get(sym);
5379
5380 Env<AttrContext> lintEnv = env;
5381 while (lintEnv.info.lint == null)
5382 lintEnv = lintEnv.next;
5383
5384 Lint lint = lintEnv.info.lint.augment(sym);
5385
5386 Lint prevLint = chk.setLint(lint);
5387 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
5388
5389 try {
5390 deferredLintHandler.flush(env.tree.pos());
5391 attrib.accept(env);
5392 } finally {
5393 log.useSource(prev);
5394 chk.setLint(prevLint);
5395 }
5396 }
5397
5398 /** Main method: attribute class definition associated with given class symbol.
5399 * reporting completion failures at the given position.
5400 * @param pos The source position at which completion errors are to be
5401 * reported.
5402 * @param c The class symbol whose definition will be attributed.
5403 */
5404 public void attribClass(DiagnosticPosition pos, ClassSymbol c) {
5405 try {
5406 annotate.flush();
5407 attribClass(c);
5408 if (allowPrimitiveClasses && c.type.isPrimitiveClass()) {
5409 final Env<AttrContext> env = typeEnvs.get(c);
5410 if (env != null && env.tree != null && env.tree.hasTag(CLASSDEF))
5411 chk.checkNonCyclicMembership((JCClassDecl)env.tree);
5412 }
5413 } catch (CompletionFailure ex) {
5414 chk.completionError(pos, ex);
5415 }
5416 }
5417
5418 /** Attribute class definition associated with given class symbol.
5419 * @param c The class symbol whose definition will be attributed.
5420 */
5421 void attribClass(ClassSymbol c) throws CompletionFailure {
5422 if (c.type.hasTag(ERROR)) return;
5423
5424 // Check for cycles in the inheritance graph, which can arise from
5425 // ill-formed class files.
5426 chk.checkNonCyclic(null, c.type);
5427
5428 Type st = types.supertype(c.type);
5429 if ((c.flags_field & Flags.COMPOUND) == 0 &&
5430 (c.flags_field & Flags.SUPER_OWNER_ATTRIBUTED) == 0) {
5431 // First, attribute superclass.
5432 if (st.hasTag(CLASS))
5433 attribClass((ClassSymbol)st.tsym);
5434
5435 // Next attribute owner, if it is a class.
5436 if (c.owner.kind == TYP && c.owner.type.hasTag(CLASS))
5437 attribClass((ClassSymbol)c.owner);
5438
5439 c.flags_field |= Flags.SUPER_OWNER_ATTRIBUTED;
5440 }
5441
5442 // The previous operations might have attributed the current class
5443 // if there was a cycle. So we test first whether the class is still
5444 // UNATTRIBUTED.
5445 if ((c.flags_field & UNATTRIBUTED) != 0) {
5446 c.flags_field &= ~UNATTRIBUTED;
5447
5448 // Get environment current at the point of class definition.
5449 Env<AttrContext> env = typeEnvs.get(c);
5450
5451 if (c.isSealed() &&
5452 !c.isEnum() &&
5453 !c.isPermittedExplicit &&
5454 c.permitted.isEmpty()) {
5455 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.SealedClassMustHaveSubclasses);
5456 }
5457
5458 if (c.isSealed()) {
5459 Set<Symbol> permittedTypes = new HashSet<>();
5460 boolean sealedInUnnamed = c.packge().modle == syms.unnamedModule || c.packge().modle == syms.noModule;
5461 for (Symbol subTypeSym : c.permitted) {
5462 boolean isTypeVar = false;
5463 if (subTypeSym.type.getTag() == TYPEVAR) {
5464 isTypeVar = true; //error recovery
5465 log.error(TreeInfo.diagnosticPositionFor(subTypeSym, env.tree),
5466 Errors.InvalidPermitsClause(Fragments.IsATypeVariable(subTypeSym.type)));
5467 }
5468 if (subTypeSym.isAnonymous() && !c.isEnum()) {
5469 log.error(TreeInfo.diagnosticPositionFor(subTypeSym, env.tree), Errors.LocalClassesCantExtendSealed(Fragments.Anonymous));
5470 }
5471 if (permittedTypes.contains(subTypeSym)) {
5472 DiagnosticPosition pos =
5473 env.enclClass.permitting.stream()
5474 .filter(permittedExpr -> TreeInfo.diagnosticPositionFor(subTypeSym, permittedExpr, true) != null)
5475 .limit(2).collect(List.collector()).get(1);
5476 log.error(pos, Errors.InvalidPermitsClause(Fragments.IsDuplicated(subTypeSym.type)));
5477 } else {
5478 permittedTypes.add(subTypeSym);
5479 }
5480 if (sealedInUnnamed) {
5481 if (subTypeSym.packge() != c.packge()) {
5482 log.error(TreeInfo.diagnosticPositionFor(subTypeSym, env.tree),
5483 Errors.ClassInUnnamedModuleCantExtendSealedInDiffPackage(c)
5484 );
5485 }
5486 } else if (subTypeSym.packge().modle != c.packge().modle) {
5487 log.error(TreeInfo.diagnosticPositionFor(subTypeSym, env.tree),
5488 Errors.ClassInModuleCantExtendSealedInDiffModule(c, c.packge().modle)
5489 );
5490 }
5491 if (subTypeSym == c.type.tsym || types.isSuperType(subTypeSym.type, c.type)) {
5492 log.error(TreeInfo.diagnosticPositionFor(subTypeSym, ((JCClassDecl)env.tree).permitting),
5493 Errors.InvalidPermitsClause(
5494 subTypeSym == c.type.tsym ?
5495 Fragments.MustNotBeSameClass :
5496 Fragments.MustNotBeSupertype(subTypeSym.type)
5497 )
5498 );
5499 } else if (!isTypeVar) {
5500 boolean thisIsASuper = types.directSupertypes(subTypeSym.type)
5501 .stream()
5502 .anyMatch(d -> d.tsym == c);
5503 if (!thisIsASuper) {
5504 log.error(TreeInfo.diagnosticPositionFor(subTypeSym, env.tree),
5505 Errors.InvalidPermitsClause(Fragments.DoesntExtendSealed(subTypeSym.type)));
5506 }
5507 }
5508 }
5509 }
5510
5511 List<ClassSymbol> sealedSupers = types.directSupertypes(c.type)
5512 .stream()
5513 .filter(s -> s.tsym.isSealed())
5514 .map(s -> (ClassSymbol) s.tsym)
5515 .collect(List.collector());
5516
5517 if (sealedSupers.isEmpty()) {
5518 if ((c.flags_field & Flags.NON_SEALED) != 0) {
5519 boolean hasErrorSuper = false;
5520
5521 hasErrorSuper |= types.directSupertypes(c.type)
5522 .stream()
5523 .anyMatch(s -> s.tsym.kind == Kind.ERR);
5524
5525 ClassType ct = (ClassType) c.type;
5526
5527 hasErrorSuper |= !ct.isCompound() && ct.interfaces_field != ct.all_interfaces_field;
5528
5529 if (!hasErrorSuper) {
5530 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.NonSealedWithNoSealedSupertype(c));
5531 }
5532 }
5533 } else if ((c.flags_field & Flags.COMPOUND) == 0) {
5534 if (c.isDirectlyOrIndirectlyLocal() && !c.isEnum()) {
5535 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.LocalClassesCantExtendSealed(c.isAnonymous() ? Fragments.Anonymous : Fragments.Local));
5536 }
5537
5538 if (!c.type.isCompound()) {
5539 for (ClassSymbol supertypeSym : sealedSupers) {
5540 if (!supertypeSym.permitted.contains(c.type.tsym)) {
5541 log.error(TreeInfo.diagnosticPositionFor(c.type.tsym, env.tree), Errors.CantInheritFromSealed(supertypeSym));
5542 }
5543 }
5544 if (!c.isNonSealed() && !c.isFinal() && !c.isSealed()) {
5545 log.error(TreeInfo.diagnosticPositionFor(c, env.tree),
5546 c.isInterface() ?
5547 Errors.NonSealedOrSealedExpected :
5548 Errors.NonSealedSealedOrFinalExpected);
5549 }
5550 }
5551 }
5552
5553 // The info.lint field in the envs stored in typeEnvs is deliberately uninitialized,
5554 // because the annotations were not available at the time the env was created. Therefore,
5555 // we look up the environment chain for the first enclosing environment for which the
5556 // lint value is set. Typically, this is the parent env, but might be further if there
5557 // are any envs created as a result of TypeParameter nodes.
5558 Env<AttrContext> lintEnv = env;
5559 while (lintEnv.info.lint == null)
5560 lintEnv = lintEnv.next;
5561
5562 // Having found the enclosing lint value, we can initialize the lint value for this class
5563 env.info.lint = lintEnv.info.lint.augment(c);
5564
5565 Lint prevLint = chk.setLint(env.info.lint);
5566 JavaFileObject prev = log.useSource(c.sourcefile);
5567 ResultInfo prevReturnRes = env.info.returnResult;
5568
5569 try {
5570 deferredLintHandler.flush(env.tree);
5571 env.info.returnResult = null;
5572 // java.lang.Enum may not be subclassed by a non-enum
5573 if (st.tsym == syms.enumSym &&
5574 ((c.flags_field & (Flags.ENUM|Flags.COMPOUND)) == 0))
5575 log.error(env.tree.pos(), Errors.EnumNoSubclassing);
5576
5577 // Enums may not be extended by source-level classes
5578 if (st.tsym != null &&
5579 ((st.tsym.flags_field & Flags.ENUM) != 0) &&
5580 ((c.flags_field & (Flags.ENUM | Flags.COMPOUND)) == 0)) {
5581 log.error(env.tree.pos(), Errors.EnumTypesNotExtensible);
5582 }
5583
5584 if (rs.isSerializable(c.type)) {
5585 env.info.isSerializable = true;
5586 }
5587
5588 if (c.isValueClass()) {
5589 Assert.check(env.tree.hasTag(CLASSDEF));
5590 chk.checkConstraintsOfValueClass(env.tree.pos(), c);
5591 }
5592
5593 attribClassBody(env, c);
5594
5595 chk.checkDeprecatedAnnotation(env.tree.pos(), c);
5596 chk.checkClassOverrideEqualsAndHashIfNeeded(env.tree.pos(), c);
5597 chk.checkFunctionalInterface((JCClassDecl) env.tree, c);
5598 chk.checkLeaksNotAccessible(env, (JCClassDecl) env.tree);
5599 } finally {
5600 env.info.returnResult = prevReturnRes;
5601 log.useSource(prev);
5602 chk.setLint(prevLint);
5603 }
5604
5605 }
5606 }
5607
5608 public void visitImport(JCImport tree) {
5609 // nothing to do
5610 }
5611
5612 public void visitModuleDef(JCModuleDecl tree) {
5613 tree.sym.completeUsesProvides();
5614 ModuleSymbol msym = tree.sym;
5615 Lint lint = env.outer.info.lint = env.outer.info.lint.augment(msym);
5616 Lint prevLint = chk.setLint(lint);
5617 chk.checkModuleName(tree);
5618 chk.checkDeprecatedAnnotation(tree, msym);
5619
5620 try {
5621 deferredLintHandler.flush(tree.pos());
5622 } finally {
5623 chk.setLint(prevLint);
5624 }
5625 }
5626
5627 /** Finish the attribution of a class. */
5628 private void attribClassBody(Env<AttrContext> env, ClassSymbol c) {
5629 JCClassDecl tree = (JCClassDecl)env.tree;
5630 Assert.check(c == tree.sym);
5631
5632 // Validate type parameters, supertype and interfaces.
5633 attribStats(tree.typarams, env);
5634 if (!c.isAnonymous()) {
5635 //already checked if anonymous
5636 chk.validate(tree.typarams, env);
5637 chk.validate(tree.extending, env);
5638 chk.validate(tree.implementing, env);
5639 }
5640
5641 c.markAbstractIfNeeded(types);
5642
5643 // If this is a non-abstract class, check that it has no abstract
5644 // methods or unimplemented methods of an implemented interface.
5645 if ((c.flags() & (ABSTRACT | INTERFACE)) == 0) {
5646 chk.checkAllDefined(tree.pos(), c);
5647 }
5648
5649 if ((c.flags() & ANNOTATION) != 0) {
5650 if (tree.implementing.nonEmpty())
5651 log.error(tree.implementing.head.pos(),
5652 Errors.CantExtendIntfAnnotation);
5653 if (tree.typarams.nonEmpty()) {
5654 log.error(tree.typarams.head.pos(),
5655 Errors.IntfAnnotationCantHaveTypeParams(c));
5656 }
5657
5658 // If this annotation type has a @Repeatable, validate
5659 Attribute.Compound repeatable = c.getAnnotationTypeMetadata().getRepeatable();
5660 // If this annotation type has a @Repeatable, validate
5661 if (repeatable != null) {
5662 // get diagnostic position for error reporting
5663 DiagnosticPosition cbPos = getDiagnosticPosition(tree, repeatable.type);
5664 Assert.checkNonNull(cbPos);
5665
5666 chk.validateRepeatable(c, repeatable, cbPos);
5667 }
5668 } else {
5669 // Check that all extended classes and interfaces
5670 // are compatible (i.e. no two define methods with same arguments
5671 // yet different return types). (JLS 8.4.8.3)
5672 chk.checkCompatibleSupertypes(tree.pos(), c.type);
5673 chk.checkDefaultMethodClashes(tree.pos(), c.type);
5674 }
5675
5676 // Check that class does not import the same parameterized interface
5677 // with two different argument lists.
5678 chk.checkClassBounds(tree.pos(), c.type);
5679
5680 tree.type = c.type;
5681
5682 for (List<JCTypeParameter> l = tree.typarams;
5683 l.nonEmpty(); l = l.tail) {
5684 Assert.checkNonNull(env.info.scope.findFirst(l.head.name));
5685 }
5686
5687 // Check that a generic class doesn't extend Throwable
5688 if (!c.type.allparams().isEmpty() && types.isSubtype(c.type, syms.throwableType))
5689 log.error(tree.extending.pos(), Errors.GenericThrowable);
5690
5691 // Check that all methods which implement some
5692 // method conform to the method they implement.
5693 chk.checkImplementations(tree);
5694
5695 //check that a resource implementing AutoCloseable cannot throw InterruptedException
5696 checkAutoCloseable(tree.pos(), env, c.type);
5697
5698 for (List<JCTree> l = tree.defs; l.nonEmpty(); l = l.tail) {
5699 // Attribute declaration
5700 attribStat(l.head, env);
5701 // Check that declarations in inner classes are not static (JLS 8.1.2)
5702 // Make an exception for static constants.
5703 if (!allowRecords &&
5704 c.owner.kind != PCK &&
5705 ((c.flags() & STATIC) == 0 || c.name == names.empty) &&
5706 (TreeInfo.flags(l.head) & (STATIC | INTERFACE)) != 0) {
5707 VarSymbol sym = null;
5708 if (l.head.hasTag(VARDEF)) sym = ((JCVariableDecl) l.head).sym;
5709 if (sym == null ||
5710 sym.kind != VAR ||
5711 sym.getConstValue() == null)
5712 log.error(l.head.pos(), Errors.IclsCantHaveStaticDecl(c));
5713 }
5714 }
5715
5716 // Check for cycles among non-initial constructors.
5717 chk.checkCyclicConstructors(tree);
5718
5719 // Check for cycles among annotation elements.
5720 chk.checkNonCyclicElements(tree);
5721
5722 // Check for proper use of serialVersionUID and other
5723 // serialization-related fields and methods
5724 if (env.info.lint.isEnabled(LintCategory.SERIAL)
5725 && rs.isSerializable(c.type)
5726 && !c.isAnonymous()) {
5727 chk.checkSerialStructure(tree, c);
5728 }
5729 // Correctly organize the positions of the type annotations
5730 typeAnnotations.organizeTypeAnnotationsBodies(tree);
5731
5732 // Check type annotations applicability rules
5733 validateTypeAnnotations(tree, false);
5734 }
5735 // where
5736 /** get a diagnostic position for an attribute of Type t, or null if attribute missing */
5737 private DiagnosticPosition getDiagnosticPosition(JCClassDecl tree, Type t) {
5738 for(List<JCAnnotation> al = tree.mods.annotations; !al.isEmpty(); al = al.tail) {
5739 if (types.isSameType(al.head.annotationType.type, t))
5740 return al.head.pos();
5741 }
5742
5743 return null;
5744 }
5745
5746 private Type capture(Type type) {
5747 return types.capture(type);
5748 }
5749
5750 private void setSyntheticVariableType(JCVariableDecl tree, Type type) {
5751 if (type.isErroneous()) {
5752 tree.vartype = make.at(Position.NOPOS).Erroneous();
5753 } else {
5754 tree.vartype = make.at(Position.NOPOS).Type(type);
5755 }
5756 }
5757
5758 public void validateTypeAnnotations(JCTree tree, boolean sigOnly) {
5759 tree.accept(new TypeAnnotationsValidator(sigOnly));
5760 }
5761 //where
5762 private final class TypeAnnotationsValidator extends TreeScanner {
5763
5764 private final boolean sigOnly;
5765 public TypeAnnotationsValidator(boolean sigOnly) {
5766 this.sigOnly = sigOnly;
5767 }
5768
5769 public void visitAnnotation(JCAnnotation tree) {
5770 chk.validateTypeAnnotation(tree, false);
5771 super.visitAnnotation(tree);
5772 }
5773 public void visitAnnotatedType(JCAnnotatedType tree) {
5774 if (!tree.underlyingType.type.isErroneous()) {
5775 super.visitAnnotatedType(tree);
5776 }
5777 }
5778 public void visitTypeParameter(JCTypeParameter tree) {
5779 chk.validateTypeAnnotations(tree.annotations, true);
5780 scan(tree.bounds);
5781 // Don't call super.
5782 // This is needed because above we call validateTypeAnnotation with
5783 // false, which would forbid annotations on type parameters.
5784 // super.visitTypeParameter(tree);
5785 }
5786 public void visitMethodDef(JCMethodDecl tree) {
5787 if (tree.recvparam != null &&
5788 !tree.recvparam.vartype.type.isErroneous()) {
5789 checkForDeclarationAnnotations(tree.recvparam.mods.annotations, tree.recvparam.sym);
5790 }
5791 if (tree.restype != null && tree.restype.type != null) {
5792 validateAnnotatedType(tree.restype, tree.restype.type);
5793 }
5794 if (sigOnly) {
5795 scan(tree.mods);
5796 scan(tree.restype);
5797 scan(tree.typarams);
5798 scan(tree.recvparam);
5799 scan(tree.params);
5800 scan(tree.thrown);
5801 } else {
5802 scan(tree.defaultValue);
5803 scan(tree.body);
5804 }
5805 }
5806 public void visitVarDef(final JCVariableDecl tree) {
5807 //System.err.println("validateTypeAnnotations.visitVarDef " + tree);
5808 if (tree.sym != null && tree.sym.type != null && !tree.isImplicitlyTyped())
5809 validateAnnotatedType(tree.vartype, tree.sym.type);
5810 scan(tree.mods);
5811 scan(tree.vartype);
5812 if (!sigOnly) {
5813 scan(tree.init);
5814 }
5815 }
5816 public void visitTypeCast(JCTypeCast tree) {
5817 if (tree.clazz != null && tree.clazz.type != null)
5818 validateAnnotatedType(tree.clazz, tree.clazz.type);
5819 super.visitTypeCast(tree);
5820 }
5821 public void visitTypeTest(JCInstanceOf tree) {
5822 if (tree.pattern != null && !(tree.pattern instanceof JCPattern) && tree.pattern.type != null)
5823 validateAnnotatedType(tree.pattern, tree.pattern.type);
5824 super.visitTypeTest(tree);
5825 }
5826 public void visitNewClass(JCNewClass tree) {
5827 if (tree.clazz != null && tree.clazz.type != null) {
5828 if (tree.clazz.hasTag(ANNOTATED_TYPE)) {
5829 checkForDeclarationAnnotations(((JCAnnotatedType) tree.clazz).annotations,
5830 tree.clazz.type.tsym);
5831 }
5832 if (tree.def != null) {
5833 checkForDeclarationAnnotations(tree.def.mods.annotations, tree.clazz.type.tsym);
5834 }
5835
5836 validateAnnotatedType(tree.clazz, tree.clazz.type);
5837 }
5838 super.visitNewClass(tree);
5839 }
5840 public void visitNewArray(JCNewArray tree) {
5841 if (tree.elemtype != null && tree.elemtype.type != null) {
5842 if (tree.elemtype.hasTag(ANNOTATED_TYPE)) {
5843 checkForDeclarationAnnotations(((JCAnnotatedType) tree.elemtype).annotations,
5844 tree.elemtype.type.tsym);
5845 }
5846 validateAnnotatedType(tree.elemtype, tree.elemtype.type);
5847 }
5848 super.visitNewArray(tree);
5849 }
5850 public void visitClassDef(JCClassDecl tree) {
5851 //System.err.println("validateTypeAnnotations.visitClassDef " + tree);
5852 if (sigOnly) {
5853 scan(tree.mods);
5854 scan(tree.typarams);
5855 scan(tree.extending);
5856 scan(tree.implementing);
5857 }
5858 for (JCTree member : tree.defs) {
5859 if (member.hasTag(Tag.CLASSDEF)) {
5860 continue;
5861 }
5862 scan(member);
5863 }
5864 }
5865 public void visitBlock(JCBlock tree) {
5866 if (!sigOnly) {
5867 scan(tree.stats);
5868 }
5869 }
5870
5871 /* I would want to model this after
5872 * com.sun.tools.javac.comp.Check.Validator.visitSelectInternal(JCFieldAccess)
5873 * and override visitSelect and visitTypeApply.
5874 * However, we only set the annotated type in the top-level type
5875 * of the symbol.
5876 * Therefore, we need to override each individual location where a type
5877 * can occur.
5878 */
5879 private void validateAnnotatedType(final JCTree errtree, final Type type) {
5880 //System.err.println("Attr.validateAnnotatedType: " + errtree + " type: " + type);
5881
5882 if (type.isPrimitiveOrVoid()) {
5883 return;
5884 }
5885
5886 JCTree enclTr = errtree;
5887 Type enclTy = type;
5888
5889 boolean repeat = true;
5890 while (repeat) {
5891 if (enclTr.hasTag(TYPEAPPLY)) {
5892 List<Type> tyargs = enclTy.getTypeArguments();
5893 List<JCExpression> trargs = ((JCTypeApply)enclTr).getTypeArguments();
5894 if (trargs.length() > 0) {
5895 // Nothing to do for diamonds
5896 if (tyargs.length() == trargs.length()) {
5897 for (int i = 0; i < tyargs.length(); ++i) {
5898 validateAnnotatedType(trargs.get(i), tyargs.get(i));
5899 }
5900 }
5901 // If the lengths don't match, it's either a diamond
5902 // or some nested type that redundantly provides
5903 // type arguments in the tree.
5904 }
5905
5906 // Look at the clazz part of a generic type
5907 enclTr = ((JCTree.JCTypeApply)enclTr).clazz;
5908 }
5909
5910 if (enclTr.hasTag(SELECT)) {
5911 enclTr = ((JCTree.JCFieldAccess)enclTr).getExpression();
5912 if (enclTy != null &&
5913 !enclTy.hasTag(NONE)) {
5914 enclTy = enclTy.getEnclosingType();
5915 }
5916 } else if (enclTr.hasTag(ANNOTATED_TYPE)) {
5917 JCAnnotatedType at = (JCTree.JCAnnotatedType) enclTr;
5918 if (enclTy == null || enclTy.hasTag(NONE)) {
5919 if (at.getAnnotations().size() == 1) {
5920 log.error(at.underlyingType.pos(), Errors.CantTypeAnnotateScoping1(at.getAnnotations().head.attribute));
5921 } else {
5922 ListBuffer<Attribute.Compound> comps = new ListBuffer<>();
5923 for (JCAnnotation an : at.getAnnotations()) {
5924 comps.add(an.attribute);
5925 }
5926 log.error(at.underlyingType.pos(), Errors.CantTypeAnnotateScoping(comps.toList()));
5927 }
5928 repeat = false;
5929 }
5930 enclTr = at.underlyingType;
5931 // enclTy doesn't need to be changed
5932 } else if (enclTr.hasTag(IDENT)) {
5933 repeat = false;
5934 } else if (enclTr.hasTag(JCTree.Tag.WILDCARD)) {
5935 JCWildcard wc = (JCWildcard) enclTr;
5936 if (wc.getKind() == JCTree.Kind.EXTENDS_WILDCARD ||
5937 wc.getKind() == JCTree.Kind.SUPER_WILDCARD) {
5938 validateAnnotatedType(wc.getBound(), wc.getBound().type);
5939 } else {
5940 // Nothing to do for UNBOUND
5941 }
5942 repeat = false;
5943 } else if (enclTr.hasTag(TYPEARRAY)) {
5944 JCArrayTypeTree art = (JCArrayTypeTree) enclTr;
5945 validateAnnotatedType(art.getType(), art.elemtype.type);
5946 repeat = false;
5947 } else if (enclTr.hasTag(TYPEUNION)) {
5948 JCTypeUnion ut = (JCTypeUnion) enclTr;
5949 for (JCTree t : ut.getTypeAlternatives()) {
5950 validateAnnotatedType(t, t.type);
5951 }
5952 repeat = false;
5953 } else if (enclTr.hasTag(TYPEINTERSECTION)) {
5954 JCTypeIntersection it = (JCTypeIntersection) enclTr;
5955 for (JCTree t : it.getBounds()) {
5956 validateAnnotatedType(t, t.type);
5957 }
5958 repeat = false;
5959 } else if (enclTr.getKind() == JCTree.Kind.PRIMITIVE_TYPE ||
5960 enclTr.getKind() == JCTree.Kind.ERRONEOUS) {
5961 repeat = false;
5962 } else {
5963 Assert.error("Unexpected tree: " + enclTr + " with kind: " + enclTr.getKind() +
5964 " within: "+ errtree + " with kind: " + errtree.getKind());
5965 }
5966 }
5967 }
5968
5969 private void checkForDeclarationAnnotations(List<? extends JCAnnotation> annotations,
5970 Symbol sym) {
5971 // Ensure that no declaration annotations are present.
5972 // Note that a tree type might be an AnnotatedType with
5973 // empty annotations, if only declaration annotations were given.
5974 // This method will raise an error for such a type.
5975 for (JCAnnotation ai : annotations) {
5976 if (!ai.type.isErroneous() &&
5977 typeAnnotations.annotationTargetType(ai.attribute, sym) == TypeAnnotations.AnnotationType.DECLARATION) {
5978 log.error(ai.pos(), Errors.AnnotationTypeNotApplicableToType(ai.type));
5979 }
5980 }
5981 }
5982 }
5983
5984 // <editor-fold desc="post-attribution visitor">
5985
5986 /**
5987 * Handle missing types/symbols in an AST. This routine is useful when
5988 * the compiler has encountered some errors (which might have ended up
5989 * terminating attribution abruptly); if the compiler is used in fail-over
5990 * mode (e.g. by an IDE) and the AST contains semantic errors, this routine
5991 * prevents NPE to be propagated during subsequent compilation steps.
5992 */
5993 public void postAttr(JCTree tree) {
5994 new PostAttrAnalyzer().scan(tree);
5995 }
5996
5997 class PostAttrAnalyzer extends TreeScanner {
5998
5999 private void initTypeIfNeeded(JCTree that) {
6000 if (that.type == null) {
6001 if (that.hasTag(METHODDEF)) {
6002 that.type = dummyMethodType((JCMethodDecl)that);
6003 } else {
6004 that.type = syms.unknownType;
6005 }
6006 }
6007 }
6008
6009 /* Construct a dummy method type. If we have a method declaration,
6010 * and the declared return type is void, then use that return type
6011 * instead of UNKNOWN to avoid spurious error messages in lambda
6012 * bodies (see:JDK-8041704).
6013 */
6014 private Type dummyMethodType(JCMethodDecl md) {
6015 Type restype = syms.unknownType;
6016 if (md != null && md.restype != null && md.restype.hasTag(TYPEIDENT)) {
6017 JCPrimitiveTypeTree prim = (JCPrimitiveTypeTree)md.restype;
6018 if (prim.typetag == VOID)
6019 restype = syms.voidType;
6020 }
6021 return new MethodType(List.nil(), restype,
6022 List.nil(), syms.methodClass);
6023 }
6024 private Type dummyMethodType() {
6025 return dummyMethodType(null);
6026 }
6027
6028 @Override
6029 public void scan(JCTree tree) {
6030 if (tree == null) return;
6031 if (tree instanceof JCExpression) {
6032 initTypeIfNeeded(tree);
6033 }
6034 super.scan(tree);
6035 }
6036
6037 @Override
6038 public void visitIdent(JCIdent that) {
6039 if (that.sym == null) {
6040 that.sym = syms.unknownSymbol;
6041 }
6042 }
6043
6044 @Override
6045 public void visitSelect(JCFieldAccess that) {
6046 if (that.sym == null) {
6047 that.sym = syms.unknownSymbol;
6048 }
6049 super.visitSelect(that);
6050 }
6051
6052 @Override
6053 public void visitClassDef(JCClassDecl that) {
6054 initTypeIfNeeded(that);
6055 if (that.sym == null) {
6056 that.sym = new ClassSymbol(0, that.name, that.type, syms.noSymbol);
6057 }
6058 super.visitClassDef(that);
6059 }
6060
6061 @Override
6062 public void visitMethodDef(JCMethodDecl that) {
6063 initTypeIfNeeded(that);
6064 if (that.sym == null) {
6065 that.sym = new MethodSymbol(0, that.name, that.type, syms.noSymbol);
6066 }
6067 super.visitMethodDef(that);
6068 }
6069
6070 @Override
6071 public void visitVarDef(JCVariableDecl that) {
6072 initTypeIfNeeded(that);
6073 if (that.sym == null) {
6074 that.sym = new VarSymbol(0, that.name, that.type, syms.noSymbol);
6075 that.sym.adr = 0;
6076 }
6077 if (that.vartype == null) {
6078 that.vartype = make.at(Position.NOPOS).Erroneous();
6079 }
6080 super.visitVarDef(that);
6081 }
6082
6083 @Override
6084 public void visitBindingPattern(JCBindingPattern that) {
6085 initTypeIfNeeded(that);
6086 initTypeIfNeeded(that.var);
6087 if (that.var.sym == null) {
6088 that.var.sym = new BindingSymbol(0, that.var.name, that.var.type, syms.noSymbol);
6089 that.var.sym.adr = 0;
6090 }
6091 super.visitBindingPattern(that);
6092 }
6093
6094 @Override
6095 public void visitNewClass(JCNewClass that) {
6096 if (that.constructor == null) {
6097 that.constructor = new MethodSymbol(0, names.init,
6098 dummyMethodType(), syms.noSymbol);
6099 }
6100 if (that.constructorType == null) {
6101 that.constructorType = syms.unknownType;
6102 }
6103 super.visitNewClass(that);
6104 }
6105
6106 @Override
6107 public void visitAssignop(JCAssignOp that) {
6108 if (that.operator == null) {
6109 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6110 -1, syms.noSymbol);
6111 }
6112 super.visitAssignop(that);
6113 }
6114
6115 @Override
6116 public void visitBinary(JCBinary that) {
6117 if (that.operator == null) {
6118 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6119 -1, syms.noSymbol);
6120 }
6121 super.visitBinary(that);
6122 }
6123
6124 @Override
6125 public void visitUnary(JCUnary that) {
6126 if (that.operator == null) {
6127 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6128 -1, syms.noSymbol);
6129 }
6130 super.visitUnary(that);
6131 }
6132
6133 @Override
6134 public void visitReference(JCMemberReference that) {
6135 super.visitReference(that);
6136 if (that.sym == null) {
6137 that.sym = new MethodSymbol(0, names.empty, dummyMethodType(),
6138 syms.noSymbol);
6139 }
6140 }
6141 }
6142 // </editor-fold>
6143
6144 public void setPackageSymbols(JCExpression pid, Symbol pkg) {
6145 new TreeScanner() {
6146 Symbol packge = pkg;
6147 @Override
6148 public void visitIdent(JCIdent that) {
6149 that.sym = packge;
6150 }
6151
6152 @Override
6153 public void visitSelect(JCFieldAccess that) {
6154 that.sym = packge;
6155 packge = packge.owner;
6156 super.visitSelect(that);
6157 }
6158 }.scan(pid);
6159 }
6160
6161 }