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.IdentifierTree;
38 import com.sun.source.tree.MemberReferenceTree.ReferenceMode;
39 import com.sun.source.tree.MemberSelectTree;
40 import com.sun.source.tree.TreeVisitor;
41 import com.sun.source.util.SimpleTreeVisitor;
42 import com.sun.tools.javac.code.*;
43 import com.sun.tools.javac.code.Lint.LintCategory;
44 import com.sun.tools.javac.code.Scope.WriteableScope;
45 import com.sun.tools.javac.code.Source.Feature;
46 import com.sun.tools.javac.code.Symbol.*;
47 import com.sun.tools.javac.code.Type.*;
48 import com.sun.tools.javac.code.Type.ClassType.Flavor;
49 import com.sun.tools.javac.code.TypeMetadata.Annotations;
50 import com.sun.tools.javac.code.Types.FunctionDescriptorLookupError;
51 import com.sun.tools.javac.comp.ArgumentAttr.LocalCacheContext;
52 import com.sun.tools.javac.comp.Check.CheckContext;
53 import com.sun.tools.javac.comp.DeferredAttr.AttrMode;
54 import com.sun.tools.javac.comp.MatchBindingsComputer.MatchBindings;
55 import com.sun.tools.javac.jvm.*;
56
57 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.Diamond;
58 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.DiamondInvalidArg;
59 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.DiamondInvalidArgs;
60
61 import com.sun.tools.javac.resources.CompilerProperties.Errors;
62 import com.sun.tools.javac.resources.CompilerProperties.Fragments;
63 import com.sun.tools.javac.resources.CompilerProperties.Warnings;
64 import com.sun.tools.javac.tree.*;
65 import com.sun.tools.javac.tree.JCTree.*;
66 import com.sun.tools.javac.tree.JCTree.JCPolyExpression.*;
67 import com.sun.tools.javac.util.*;
68 import com.sun.tools.javac.util.DefinedBy.Api;
69 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
70 import com.sun.tools.javac.util.JCDiagnostic.Error;
71 import com.sun.tools.javac.util.JCDiagnostic.Fragment;
72 import com.sun.tools.javac.util.JCDiagnostic.Warning;
73 import com.sun.tools.javac.util.List;
74
75 import static com.sun.tools.javac.code.Flags.*;
76 import static com.sun.tools.javac.code.Flags.ANNOTATION;
77 import static com.sun.tools.javac.code.Flags.BLOCK;
78 import static com.sun.tools.javac.code.Kinds.*;
79 import static com.sun.tools.javac.code.Kinds.Kind.*;
80 import static com.sun.tools.javac.code.TypeTag.*;
81 import static com.sun.tools.javac.code.TypeTag.WILDCARD;
82 import static com.sun.tools.javac.tree.JCTree.Tag.*;
83 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticFlag;
84
85 /** This is the main context-dependent analysis phase in GJC. It
86 * encompasses name resolution, type checking and constant folding as
87 * subtasks. Some subtasks involve auxiliary classes.
88 * @see Check
89 * @see Resolve
90 * @see ConstFold
91 * @see Infer
92 *
93 * <p><b>This is NOT part of any supported API.
94 * If you write code that depends on this, you do so at your own risk.
95 * This code and its internal interfaces are subject to change or
96 * deletion without notice.</b>
97 */
98 public class Attr extends JCTree.Visitor {
99 protected static final Context.Key<Attr> attrKey = new Context.Key<>();
100
101 final Names names;
102 final Log log;
103 final Symtab syms;
104 final Resolve rs;
105 final Operators operators;
106 final Infer infer;
107 final Analyzer analyzer;
108 final DeferredAttr deferredAttr;
109 final Check chk;
110 final Flow flow;
111 final MemberEnter memberEnter;
112 final TypeEnter typeEnter;
113 final TreeMaker make;
114 final ConstFold cfolder;
115 final Enter enter;
116 final Target target;
117 final Types types;
118 final Preview preview;
119 final JCDiagnostic.Factory diags;
120 final TypeAnnotations typeAnnotations;
121 final DeferredLintHandler deferredLintHandler;
122 final TypeEnvs typeEnvs;
123 final Dependencies dependencies;
124 final Annotate annotate;
125 final ArgumentAttr argumentAttr;
126 final MatchBindingsComputer matchBindingsComputer;
127 final AttrRecover attrRecover;
128
129 public static Attr instance(Context context) {
130 Attr instance = context.get(attrKey);
131 if (instance == null)
132 instance = new Attr(context);
133 return instance;
134 }
135
136 protected Attr(Context context) {
137 context.put(attrKey, this);
138
139 names = Names.instance(context);
140 log = Log.instance(context);
141 syms = Symtab.instance(context);
142 rs = Resolve.instance(context);
143 operators = Operators.instance(context);
144 chk = Check.instance(context);
145 flow = Flow.instance(context);
146 memberEnter = MemberEnter.instance(context);
147 typeEnter = TypeEnter.instance(context);
148 make = TreeMaker.instance(context);
149 enter = Enter.instance(context);
150 infer = Infer.instance(context);
151 analyzer = Analyzer.instance(context);
152 deferredAttr = DeferredAttr.instance(context);
153 cfolder = ConstFold.instance(context);
154 target = Target.instance(context);
155 types = Types.instance(context);
156 preview = Preview.instance(context);
157 diags = JCDiagnostic.Factory.instance(context);
158 annotate = Annotate.instance(context);
159 typeAnnotations = TypeAnnotations.instance(context);
160 deferredLintHandler = DeferredLintHandler.instance(context);
161 typeEnvs = TypeEnvs.instance(context);
162 dependencies = Dependencies.instance(context);
163 argumentAttr = ArgumentAttr.instance(context);
164 matchBindingsComputer = MatchBindingsComputer.instance(context);
165 attrRecover = AttrRecover.instance(context);
166
167 Options options = Options.instance(context);
168
169 Source source = Source.instance(context);
170 allowPrimitiveClasses = Feature.PRIMITIVE_CLASSES.allowedInSource(source) && options.isSet("enablePrimitiveClasses");
171 allowReifiableTypesInInstanceof = Feature.REIFIABLE_TYPES_INSTANCEOF.allowedInSource(source);
172 allowRecords = Feature.RECORDS.allowedInSource(source);
173 allowPatternSwitch = (preview.isEnabled() || !preview.isPreview(Feature.PATTERN_SWITCH)) &&
174 Feature.PATTERN_SWITCH.allowedInSource(source);
175 allowUnconditionalPatternsInstanceOf = (preview.isEnabled() || !preview.isPreview(Feature.UNCONDITIONAL_PATTERN_IN_INSTANCEOF)) &&
176 Feature.UNCONDITIONAL_PATTERN_IN_INSTANCEOF.allowedInSource(source);
177 sourceName = source.name;
178 useBeforeDeclarationWarning = options.isSet("useBeforeDeclarationWarning");
179
180 statInfo = new ResultInfo(KindSelector.NIL, Type.noType);
181 varAssignmentInfo = new ResultInfo(KindSelector.ASG, Type.noType);
182 unknownExprInfo = new ResultInfo(KindSelector.VAL, Type.noType);
183 methodAttrInfo = new MethodAttrInfo();
184 unknownTypeInfo = new ResultInfo(KindSelector.TYP, Type.noType);
185 unknownTypeExprInfo = new ResultInfo(KindSelector.VAL_TYP, Type.noType);
186 recoveryInfo = new RecoveryInfo(deferredAttr.emptyDeferredAttrContext);
187 }
188
189 /** Switch: allow primitive classes ?
190 */
191 boolean allowPrimitiveClasses;
192
193 /** Switch: reifiable types in instanceof enabled?
194 */
195 boolean allowReifiableTypesInInstanceof;
196
197 /** Are records allowed
198 */
199 private final boolean allowRecords;
200
201 /** Are patterns in switch allowed
202 */
203 private final boolean allowPatternSwitch;
204
205 /** Are unconditional patterns in instanceof allowed
206 */
207 private final boolean allowUnconditionalPatternsInstanceOf;
208
209 /**
210 * Switch: warn about use of variable before declaration?
211 * RFE: 6425594
212 */
213 boolean useBeforeDeclarationWarning;
214
215 /**
216 * Switch: name of source level; used for error reporting.
217 */
218 String sourceName;
219
220 /** Check kind and type of given tree against protokind and prototype.
221 * If check succeeds, store type in tree and return it.
222 * If check fails, store errType in tree and return it.
223 * No checks are performed if the prototype is a method type.
224 * It is not necessary in this case since we know that kind and type
225 * are correct.
226 *
227 * @param tree The tree whose kind and type is checked
228 * @param found The computed type of the tree
229 * @param ownkind The computed kind of the tree
230 * @param resultInfo The expected result of the tree
231 */
232 Type check(final JCTree tree,
233 final Type found,
234 final KindSelector ownkind,
235 final ResultInfo resultInfo) {
236 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
237 Type owntype;
238 boolean shouldCheck = !found.hasTag(ERROR) &&
239 !resultInfo.pt.hasTag(METHOD) &&
240 !resultInfo.pt.hasTag(FORALL);
241 if (shouldCheck && !ownkind.subset(resultInfo.pkind)) {
242 log.error(tree.pos(),
243 Errors.UnexpectedType(resultInfo.pkind.kindNames(),
244 ownkind.kindNames()));
245 owntype = types.createErrorType(found);
246 } else if (inferenceContext.free(found)) {
247 //delay the check if there are inference variables in the found type
248 //this means we are dealing with a partially inferred poly expression
249 owntype = shouldCheck ? resultInfo.pt : found;
250 if (resultInfo.checkMode.installPostInferenceHook()) {
251 inferenceContext.addFreeTypeListener(List.of(found),
252 instantiatedContext -> {
253 ResultInfo pendingResult =
254 resultInfo.dup(inferenceContext.asInstType(resultInfo.pt));
255 check(tree, inferenceContext.asInstType(found), ownkind, pendingResult);
256 });
257 }
258 } else {
259 owntype = shouldCheck ?
260 resultInfo.check(tree, found) :
261 found;
262 }
263 if (resultInfo.checkMode.updateTreeType()) {
264 tree.type = owntype;
265 }
266 return owntype;
267 }
268
269 /** Is given blank final variable assignable, i.e. in a scope where it
270 * may be assigned to even though it is final?
271 * @param v The blank final variable.
272 * @param env The current environment.
273 */
274 boolean isAssignableAsBlankFinal(VarSymbol v, Env<AttrContext> env) {
275 Symbol owner = env.info.scope.owner;
276 // owner refers to the innermost variable, method or
277 // initializer block declaration at this point.
278 boolean isAssignable =
279 v.owner == owner
280 ||
281 ((owner.name == names.init || // i.e. we are in a constructor
282 owner.kind == VAR || // i.e. we are in a variable initializer
283 (owner.flags() & BLOCK) != 0) // i.e. we are in an initializer block
284 &&
285 v.owner == owner.owner
286 &&
287 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env));
288 boolean insideCompactConstructor = env.enclMethod != null && TreeInfo.isCompactConstructor(env.enclMethod);
289 return isAssignable & !insideCompactConstructor;
290 }
291
292 /** Check that variable can be assigned to.
293 * @param pos The current source code position.
294 * @param v The assigned variable
295 * @param base If the variable is referred to in a Select, the part
296 * to the left of the `.', null otherwise.
297 * @param env The current environment.
298 */
299 void checkAssignable(DiagnosticPosition pos, VarSymbol v, JCTree base, Env<AttrContext> env) {
300 if (v.name == names._this) {
301 log.error(pos, Errors.CantAssignValToThis);
302 } else if ((v.flags() & FINAL) != 0 &&
303 ((v.flags() & HASINIT) != 0
304 ||
305 !((base == null ||
306 TreeInfo.isThisQualifier(base)) &&
307 isAssignableAsBlankFinal(v, env)))) {
308 if (v.isResourceVariable()) { //TWR resource
309 log.error(pos, Errors.TryResourceMayNotBeAssigned(v));
310 } else {
311 log.error(pos, Errors.CantAssignValToFinalVar(v));
312 }
313 }
314 }
315
316 /** Does tree represent a static reference to an identifier?
317 * It is assumed that tree is either a SELECT or an IDENT.
318 * We have to weed out selects from non-type names here.
319 * @param tree The candidate tree.
320 */
321 boolean isStaticReference(JCTree tree) {
322 if (tree.hasTag(SELECT)) {
323 Symbol lsym = TreeInfo.symbol(((JCFieldAccess) tree).selected);
324 if (lsym == null || lsym.kind != TYP) {
325 return false;
326 }
327 }
328 return true;
329 }
330
331 /** Is this symbol a type?
332 */
333 static boolean isType(Symbol sym) {
334 return sym != null && sym.kind == TYP;
335 }
336
337 /** The current `this' symbol.
338 * @param env The current environment.
339 */
340 Symbol thisSym(DiagnosticPosition pos, Env<AttrContext> env) {
341 return rs.resolveSelf(pos, env, env.enclClass.sym, names._this);
342 }
343
344 /** Attribute a parsed identifier.
345 * @param tree Parsed identifier name
346 * @param topLevel The toplevel to use
347 */
348 public Symbol attribIdent(JCTree tree, JCCompilationUnit topLevel) {
349 Env<AttrContext> localEnv = enter.topLevelEnv(topLevel);
350 localEnv.enclClass = make.ClassDef(make.Modifiers(0),
351 syms.errSymbol.name,
352 null, null, null, null);
353 localEnv.enclClass.sym = syms.errSymbol;
354 return attribIdent(tree, localEnv);
355 }
356
357 /** Attribute a parsed identifier.
358 * @param tree Parsed identifier name
359 * @param env The env to use
360 */
361 public Symbol attribIdent(JCTree tree, Env<AttrContext> env) {
362 return tree.accept(identAttributer, env);
363 }
364 // where
365 private TreeVisitor<Symbol,Env<AttrContext>> identAttributer = new IdentAttributer();
366 private class IdentAttributer extends SimpleTreeVisitor<Symbol,Env<AttrContext>> {
367 @Override @DefinedBy(Api.COMPILER_TREE)
368 public Symbol visitMemberSelect(MemberSelectTree node, Env<AttrContext> env) {
369 Symbol site = visit(node.getExpression(), env);
370 if (site.kind == ERR || site.kind == ABSENT_TYP || site.kind == HIDDEN)
371 return site;
372 Name name = (Name)node.getIdentifier();
373 if (site.kind == PCK) {
374 env.toplevel.packge = (PackageSymbol)site;
375 return rs.findIdentInPackage(null, env, (TypeSymbol)site, name,
376 KindSelector.TYP_PCK);
377 } else {
378 env.enclClass.sym = (ClassSymbol)site;
379 return rs.findMemberType(env, site.asType(), name, (TypeSymbol)site);
380 }
381 }
382
383 @Override @DefinedBy(Api.COMPILER_TREE)
384 public Symbol visitIdentifier(IdentifierTree node, Env<AttrContext> env) {
385 return rs.findIdent(null, env, (Name)node.getName(), KindSelector.TYP_PCK);
386 }
387 }
388
389 public Type coerce(Type etype, Type ttype) {
390 return cfolder.coerce(etype, ttype);
391 }
392
393 public Type attribType(JCTree node, TypeSymbol sym) {
394 Env<AttrContext> env = typeEnvs.get(sym);
395 Env<AttrContext> localEnv = env.dup(node, env.info.dup());
396 return attribTree(node, localEnv, unknownTypeInfo);
397 }
398
399 public Type attribImportQualifier(JCImport tree, Env<AttrContext> env) {
400 // Attribute qualifying package or class.
401 JCFieldAccess s = (JCFieldAccess)tree.qualid;
402 return attribTree(s.selected, env,
403 new ResultInfo(tree.staticImport ?
404 KindSelector.TYP : KindSelector.TYP_PCK,
405 Type.noType));
406 }
407
408 public Env<AttrContext> attribExprToTree(JCTree expr, Env<AttrContext> env, JCTree tree) {
409 return attribToTree(expr, env, tree, unknownExprInfo);
410 }
411
412 public Env<AttrContext> attribStatToTree(JCTree stmt, Env<AttrContext> env, JCTree tree) {
413 return attribToTree(stmt, env, tree, statInfo);
414 }
415
416 private Env<AttrContext> attribToTree(JCTree root, Env<AttrContext> env, JCTree tree, ResultInfo resultInfo) {
417 breakTree = tree;
418 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
419 try {
420 deferredAttr.attribSpeculative(root, env, resultInfo,
421 null, DeferredAttr.AttributionMode.ATTRIB_TO_TREE,
422 argumentAttr.withLocalCacheContext());
423 attrRecover.doRecovery();
424 } catch (BreakAttr b) {
425 return b.env;
426 } catch (AssertionError ae) {
427 if (ae.getCause() instanceof BreakAttr breakAttr) {
428 return breakAttr.env;
429 } else {
430 throw ae;
431 }
432 } finally {
433 breakTree = null;
434 log.useSource(prev);
435 }
436 return env;
437 }
438
439 private JCTree breakTree = null;
440
441 private static class BreakAttr extends RuntimeException {
442 static final long serialVersionUID = -6924771130405446405L;
443 private transient Env<AttrContext> env;
444 private BreakAttr(Env<AttrContext> env) {
445 this.env = env;
446 }
447 }
448
449 /**
450 * Mode controlling behavior of Attr.Check
451 */
452 enum CheckMode {
453
454 NORMAL,
455
456 /**
457 * Mode signalling 'fake check' - skip tree update. A side-effect of this mode is
458 * that the captured var cache in {@code InferenceContext} will be used in read-only
459 * mode when performing inference checks.
460 */
461 NO_TREE_UPDATE {
462 @Override
463 public boolean updateTreeType() {
464 return false;
465 }
466 },
467 /**
468 * Mode signalling that caller will manage free types in tree decorations.
469 */
470 NO_INFERENCE_HOOK {
471 @Override
472 public boolean installPostInferenceHook() {
473 return false;
474 }
475 };
476
477 public boolean updateTreeType() {
478 return true;
479 }
480 public boolean installPostInferenceHook() {
481 return true;
482 }
483 }
484
485
486 class ResultInfo {
487 final KindSelector pkind;
488 final Type pt;
489 final CheckContext checkContext;
490 final CheckMode checkMode;
491
492 ResultInfo(KindSelector pkind, Type pt) {
493 this(pkind, pt, chk.basicHandler, CheckMode.NORMAL);
494 }
495
496 ResultInfo(KindSelector pkind, Type pt, CheckMode checkMode) {
497 this(pkind, pt, chk.basicHandler, checkMode);
498 }
499
500 protected ResultInfo(KindSelector pkind,
501 Type pt, CheckContext checkContext) {
502 this(pkind, pt, checkContext, CheckMode.NORMAL);
503 }
504
505 protected ResultInfo(KindSelector pkind,
506 Type pt, CheckContext checkContext, CheckMode checkMode) {
507 this.pkind = pkind;
508 this.pt = pt;
509 this.checkContext = checkContext;
510 this.checkMode = checkMode;
511 }
512
513 /**
514 * Should {@link Attr#attribTree} use the {@ArgumentAttr} visitor instead of this one?
515 * @param tree The tree to be type-checked.
516 * @return true if {@ArgumentAttr} should be used.
517 */
518 protected boolean needsArgumentAttr(JCTree tree) { return false; }
519
520 protected Type check(final DiagnosticPosition pos, final Type found) {
521 return chk.checkType(pos, found, pt, checkContext);
522 }
523
524 protected ResultInfo dup(Type newPt) {
525 return new ResultInfo(pkind, newPt, checkContext, checkMode);
526 }
527
528 protected ResultInfo dup(CheckContext newContext) {
529 return new ResultInfo(pkind, pt, newContext, checkMode);
530 }
531
532 protected ResultInfo dup(Type newPt, CheckContext newContext) {
533 return new ResultInfo(pkind, newPt, newContext, checkMode);
534 }
535
536 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) {
537 return new ResultInfo(pkind, newPt, newContext, newMode);
538 }
539
540 protected ResultInfo dup(CheckMode newMode) {
541 return new ResultInfo(pkind, pt, checkContext, newMode);
542 }
543
544 @Override
545 public String toString() {
546 if (pt != null) {
547 return pt.toString();
548 } else {
549 return "";
550 }
551 }
552 }
553
554 class MethodAttrInfo extends ResultInfo {
555 public MethodAttrInfo() {
556 this(chk.basicHandler);
557 }
558
559 public MethodAttrInfo(CheckContext checkContext) {
560 super(KindSelector.VAL, Infer.anyPoly, checkContext);
561 }
562
563 @Override
564 protected boolean needsArgumentAttr(JCTree tree) {
565 return true;
566 }
567
568 protected ResultInfo dup(Type newPt) {
569 throw new IllegalStateException();
570 }
571
572 protected ResultInfo dup(CheckContext newContext) {
573 return new MethodAttrInfo(newContext);
574 }
575
576 protected ResultInfo dup(Type newPt, CheckContext newContext) {
577 throw new IllegalStateException();
578 }
579
580 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) {
581 throw new IllegalStateException();
582 }
583
584 protected ResultInfo dup(CheckMode newMode) {
585 throw new IllegalStateException();
586 }
587 }
588
589 class RecoveryInfo extends ResultInfo {
590
591 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext) {
592 this(deferredAttrContext, Type.recoveryType);
593 }
594
595 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext, Type pt) {
596 super(KindSelector.VAL, pt, new Check.NestedCheckContext(chk.basicHandler) {
597 @Override
598 public DeferredAttr.DeferredAttrContext deferredAttrContext() {
599 return deferredAttrContext;
600 }
601 @Override
602 public boolean compatible(Type found, Type req, Warner warn) {
603 return true;
604 }
605 @Override
606 public void report(DiagnosticPosition pos, JCDiagnostic details) {
607 boolean needsReport = pt == Type.recoveryType ||
608 (details.getDiagnosticPosition() != null &&
609 details.getDiagnosticPosition().getTree().hasTag(LAMBDA));
610 if (needsReport) {
611 chk.basicHandler.report(pos, details);
612 }
613 }
614 });
615 }
616 }
617
618 final ResultInfo statInfo;
619 final ResultInfo varAssignmentInfo;
620 final ResultInfo methodAttrInfo;
621 final ResultInfo unknownExprInfo;
622 final ResultInfo unknownTypeInfo;
623 final ResultInfo unknownTypeExprInfo;
624 final ResultInfo recoveryInfo;
625
626 Type pt() {
627 return resultInfo.pt;
628 }
629
630 KindSelector pkind() {
631 return resultInfo.pkind;
632 }
633
634 /* ************************************************************************
635 * Visitor methods
636 *************************************************************************/
637
638 /** Visitor argument: the current environment.
639 */
640 Env<AttrContext> env;
641
642 /** Visitor argument: the currently expected attribution result.
643 */
644 ResultInfo resultInfo;
645
646 /** Visitor result: the computed type.
647 */
648 Type result;
649
650 MatchBindings matchBindings = MatchBindingsComputer.EMPTY;
651
652 /** Visitor method: attribute a tree, catching any completion failure
653 * exceptions. Return the tree's type.
654 *
655 * @param tree The tree to be visited.
656 * @param env The environment visitor argument.
657 * @param resultInfo The result info visitor argument.
658 */
659 Type attribTree(JCTree tree, Env<AttrContext> env, ResultInfo resultInfo) {
660 Env<AttrContext> prevEnv = this.env;
661 ResultInfo prevResult = this.resultInfo;
662 try {
663 this.env = env;
664 this.resultInfo = resultInfo;
665 if (resultInfo.needsArgumentAttr(tree)) {
666 result = argumentAttr.attribArg(tree, env);
667 } else {
668 tree.accept(this);
669 }
670 matchBindings = matchBindingsComputer.finishBindings(tree,
671 matchBindings);
672 if (tree == breakTree &&
673 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
674 breakTreeFound(copyEnv(env));
675 }
676 return result;
677 } catch (CompletionFailure ex) {
678 tree.type = syms.errType;
679 return chk.completionError(tree.pos(), ex);
680 } finally {
681 this.env = prevEnv;
682 this.resultInfo = prevResult;
683 }
684 }
685
686 protected void breakTreeFound(Env<AttrContext> env) {
687 throw new BreakAttr(env);
688 }
689
690 Env<AttrContext> copyEnv(Env<AttrContext> env) {
691 Env<AttrContext> newEnv =
692 env.dup(env.tree, env.info.dup(copyScope(env.info.scope)));
693 if (newEnv.outer != null) {
694 newEnv.outer = copyEnv(newEnv.outer);
695 }
696 return newEnv;
697 }
698
699 WriteableScope copyScope(WriteableScope sc) {
700 WriteableScope newScope = WriteableScope.create(sc.owner);
701 List<Symbol> elemsList = List.nil();
702 for (Symbol sym : sc.getSymbols()) {
703 elemsList = elemsList.prepend(sym);
704 }
705 for (Symbol s : elemsList) {
706 newScope.enter(s);
707 }
708 return newScope;
709 }
710
711 /** Derived visitor method: attribute an expression tree.
712 */
713 public Type attribExpr(JCTree tree, Env<AttrContext> env, Type pt) {
714 return attribTree(tree, env, new ResultInfo(KindSelector.VAL, !pt.hasTag(ERROR) ? pt : Type.noType));
715 }
716
717 /** Derived visitor method: attribute an expression tree with
718 * no constraints on the computed type.
719 */
720 public Type attribExpr(JCTree tree, Env<AttrContext> env) {
721 return attribTree(tree, env, unknownExprInfo);
722 }
723
724 /** Derived visitor method: attribute a type tree.
725 */
726 public Type attribType(JCTree tree, Env<AttrContext> env) {
727 Type result = attribType(tree, env, Type.noType);
728 return result;
729 }
730
731 /** Derived visitor method: attribute a type tree.
732 */
733 Type attribType(JCTree tree, Env<AttrContext> env, Type pt) {
734 Type result = attribTree(tree, env, new ResultInfo(KindSelector.TYP, pt));
735 return result;
736 }
737
738 /** Derived visitor method: attribute a statement or definition tree.
739 */
740 public Type attribStat(JCTree tree, Env<AttrContext> env) {
741 Env<AttrContext> analyzeEnv = analyzer.copyEnvIfNeeded(tree, env);
742 Type result = attribTree(tree, env, statInfo);
743 analyzer.analyzeIfNeeded(tree, analyzeEnv);
744 attrRecover.doRecovery();
745 return result;
746 }
747
748 /** Attribute a list of expressions, returning a list of types.
749 */
750 List<Type> attribExprs(List<JCExpression> trees, Env<AttrContext> env, Type pt) {
751 ListBuffer<Type> ts = new ListBuffer<>();
752 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
753 ts.append(attribExpr(l.head, env, pt));
754 return ts.toList();
755 }
756
757 /** Attribute a list of statements, returning nothing.
758 */
759 <T extends JCTree> void attribStats(List<T> trees, Env<AttrContext> env) {
760 for (List<T> l = trees; l.nonEmpty(); l = l.tail)
761 attribStat(l.head, env);
762 }
763
764 /** Attribute the arguments in a method call, returning the method kind.
765 */
766 KindSelector attribArgs(KindSelector initialKind, List<JCExpression> trees, Env<AttrContext> env, ListBuffer<Type> argtypes) {
767 KindSelector kind = initialKind;
768 for (JCExpression arg : trees) {
769 Type argtype = chk.checkNonVoid(arg, attribTree(arg, env, methodAttrInfo));
770 if (argtype.hasTag(DEFERRED)) {
771 kind = KindSelector.of(KindSelector.POLY, kind);
772 }
773 argtypes.append(argtype);
774 }
775 return kind;
776 }
777
778 /** Attribute a type argument list, returning a list of types.
779 * Caller is responsible for calling checkRefTypes.
780 */
781 List<Type> attribAnyTypes(List<JCExpression> trees, Env<AttrContext> env) {
782 ListBuffer<Type> argtypes = new ListBuffer<>();
783 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
784 argtypes.append(attribType(l.head, env));
785 return argtypes.toList();
786 }
787
788 /** Attribute a type argument list, returning a list of types.
789 * Check that all the types are references.
790 */
791 List<Type> attribTypes(List<JCExpression> trees, Env<AttrContext> env) {
792 List<Type> types = attribAnyTypes(trees, env);
793 return chk.checkRefTypes(trees, types);
794 }
795
796 /**
797 * Attribute type variables (of generic classes or methods).
798 * Compound types are attributed later in attribBounds.
799 * @param typarams the type variables to enter
800 * @param env the current environment
801 */
802 void attribTypeVariables(List<JCTypeParameter> typarams, Env<AttrContext> env, boolean checkCyclic) {
803 for (JCTypeParameter tvar : typarams) {
804 TypeVar a = (TypeVar)tvar.type;
805 a.tsym.flags_field |= UNATTRIBUTED;
806 a.setUpperBound(Type.noType);
807 if (!tvar.bounds.isEmpty()) {
808 List<Type> bounds = List.of(chk.checkRefType(tvar.bounds.head, attribType(tvar.bounds.head, env), false));
809 for (JCExpression bound : tvar.bounds.tail)
810 bounds = bounds.prepend(chk.checkRefType(bound, attribType(bound, env), false));
811 types.setBounds(a, bounds.reverse());
812 } else {
813 // if no bounds are given, assume a single bound of
814 // java.lang.Object.
815 types.setBounds(a, List.of(syms.objectType));
816 }
817 a.tsym.flags_field &= ~UNATTRIBUTED;
818 }
819 if (checkCyclic) {
820 for (JCTypeParameter tvar : typarams) {
821 chk.checkNonCyclic(tvar.pos(), (TypeVar)tvar.type);
822 }
823 }
824 }
825
826 /**
827 * Attribute the type references in a list of annotations.
828 */
829 void attribAnnotationTypes(List<JCAnnotation> annotations,
830 Env<AttrContext> env) {
831 for (List<JCAnnotation> al = annotations; al.nonEmpty(); al = al.tail) {
832 JCAnnotation a = al.head;
833 attribType(a.annotationType, env);
834 }
835 }
836
837 /**
838 * Attribute a "lazy constant value".
839 * @param env The env for the const value
840 * @param variable The initializer for the const value
841 * @param type The expected type, or null
842 * @see VarSymbol#setLazyConstValue
843 */
844 public Object attribLazyConstantValue(Env<AttrContext> env,
845 JCVariableDecl variable,
846 Type type) {
847
848 DiagnosticPosition prevLintPos
849 = deferredLintHandler.setPos(variable.pos());
850
851 final JavaFileObject prevSource = log.useSource(env.toplevel.sourcefile);
852 try {
853 Type itype = attribExpr(variable.init, env, type);
854 if (variable.isImplicitlyTyped()) {
855 //fixup local variable type
856 type = variable.type = variable.sym.type = chk.checkLocalVarType(variable, itype, variable.name);
857 }
858 if (itype.constValue() != null) {
859 return coerce(itype, type).constValue();
860 } else {
861 return null;
862 }
863 } finally {
864 log.useSource(prevSource);
865 deferredLintHandler.setPos(prevLintPos);
866 }
867 }
868
869 /** Attribute type reference in an `extends' or `implements' clause.
870 * Supertypes of anonymous inner classes are usually already attributed.
871 *
872 * @param tree The tree making up the type reference.
873 * @param env The environment current at the reference.
874 * @param classExpected true if only a class is expected here.
875 * @param interfaceExpected true if only an interface is expected here.
876 */
877 Type attribBase(JCTree tree,
878 Env<AttrContext> env,
879 boolean classExpected,
880 boolean interfaceExpected,
881 boolean checkExtensible) {
882 Type t = tree.type != null ?
883 tree.type :
884 attribType(tree, env);
885 try {
886 return checkBase(t, tree, env, classExpected, interfaceExpected, checkExtensible);
887 } catch (CompletionFailure ex) {
888 chk.completionError(tree.pos(), ex);
889 return t;
890 }
891 }
892 Type checkBase(Type t,
893 JCTree tree,
894 Env<AttrContext> env,
895 boolean classExpected,
896 boolean interfaceExpected,
897 boolean checkExtensible) {
898 final DiagnosticPosition pos = tree.hasTag(TYPEAPPLY) ?
899 (((JCTypeApply) tree).clazz).pos() : tree.pos();
900 if (t.tsym.isAnonymous()) {
901 log.error(pos, Errors.CantInheritFromAnon);
902 return types.createErrorType(t);
903 }
904 if (t.isErroneous())
905 return t;
906 if (t.hasTag(TYPEVAR) && !classExpected && !interfaceExpected) {
907 // check that type variable is already visible
908 if (t.getUpperBound() == null) {
909 log.error(pos, Errors.IllegalForwardRef);
910 return types.createErrorType(t);
911 }
912 } else {
913 t = chk.checkClassType(pos, t, checkExtensible);
914 }
915 if (interfaceExpected && (t.tsym.flags() & INTERFACE) == 0) {
916 log.error(pos, Errors.IntfExpectedHere);
917 // return errType is necessary since otherwise there might
918 // be undetected cycles which cause attribution to loop
919 return types.createErrorType(t);
920 } else if (checkExtensible &&
921 classExpected &&
922 (t.tsym.flags() & INTERFACE) != 0) {
923 log.error(pos, Errors.NoIntfExpectedHere);
924 return types.createErrorType(t);
925 }
926 if (checkExtensible &&
927 ((t.tsym.flags() & FINAL) != 0)) {
928 log.error(pos,
929 Errors.CantInheritFromFinal(t.tsym));
930 }
931 chk.checkNonCyclic(pos, t);
932 return t;
933 }
934
935 Type attribIdentAsEnumType(Env<AttrContext> env, JCIdent id) {
936 Assert.check((env.enclClass.sym.flags() & ENUM) != 0);
937 id.type = env.info.scope.owner.enclClass().type;
938 id.sym = env.info.scope.owner.enclClass();
939 return id.type;
940 }
941
942 public void visitClassDef(JCClassDecl tree) {
943 Optional<ArgumentAttr.LocalCacheContext> localCacheContext =
944 Optional.ofNullable(env.info.attributionMode.isSpeculative ?
945 argumentAttr.withLocalCacheContext() : null);
946 try {
947 // Local and anonymous classes have not been entered yet, so we need to
948 // do it now.
949 if (env.info.scope.owner.kind.matches(KindSelector.VAL_MTH)) {
950 enter.classEnter(tree, env);
951 } else {
952 // If this class declaration is part of a class level annotation,
953 // as in @MyAnno(new Object() {}) class MyClass {}, enter it in
954 // order to simplify later steps and allow for sensible error
955 // messages.
956 if (env.tree.hasTag(NEWCLASS) && TreeInfo.isInAnnotation(env, tree))
957 enter.classEnter(tree, env);
958 }
959
960 ClassSymbol c = tree.sym;
961 if (c == null) {
962 // exit in case something drastic went wrong during enter.
963 result = null;
964 } else {
965 // make sure class has been completed:
966 c.complete();
967
968 // If this class appears as an anonymous class
969 // in a superclass constructor call
970 // disable implicit outer instance from being passed.
971 // (This would be an illegal access to "this before super").
972 if (env.info.isSelfCall &&
973 env.tree.hasTag(NEWCLASS)) {
974 c.flags_field |= NOOUTERTHIS;
975 }
976 attribClass(tree.pos(), c);
977 result = tree.type = c.type;
978 }
979 } finally {
980 localCacheContext.ifPresent(LocalCacheContext::leave);
981 }
982 }
983
984 public void visitMethodDef(JCMethodDecl tree) {
985 MethodSymbol m = tree.sym;
986 boolean isDefaultMethod = (m.flags() & DEFAULT) != 0;
987
988 Lint lint = env.info.lint.augment(m);
989 Lint prevLint = chk.setLint(lint);
990 MethodSymbol prevMethod = chk.setMethod(m);
991 try {
992 deferredLintHandler.flush(tree.pos());
993 chk.checkDeprecatedAnnotation(tree.pos(), m);
994
995
996 // Create a new environment with local scope
997 // for attributing the method.
998 Env<AttrContext> localEnv = memberEnter.methodEnv(tree, env);
999 localEnv.info.lint = lint;
1000
1001 attribStats(tree.typarams, localEnv);
1002
1003 // If we override any other methods, check that we do so properly.
1004 // JLS ???
1005 if (m.isStatic()) {
1006 chk.checkHideClashes(tree.pos(), env.enclClass.type, m);
1007 } else {
1008 chk.checkOverrideClashes(tree.pos(), env.enclClass.type, m);
1009 }
1010 chk.checkOverride(env, tree, m);
1011
1012 if (isDefaultMethod && types.overridesObjectMethod(m.enclClass(), m)) {
1013 log.error(tree, Errors.DefaultOverridesObjectMember(m.name, Kinds.kindName(m.location()), m.location()));
1014 }
1015
1016 // Enter all type parameters into the local method scope.
1017 for (List<JCTypeParameter> l = tree.typarams; l.nonEmpty(); l = l.tail)
1018 localEnv.info.scope.enterIfAbsent(l.head.type.tsym);
1019
1020 ClassSymbol owner = env.enclClass.sym;
1021 if ((owner.flags() & ANNOTATION) != 0 &&
1022 (tree.params.nonEmpty() ||
1023 tree.recvparam != null))
1024 log.error(tree.params.nonEmpty() ?
1025 tree.params.head.pos() :
1026 tree.recvparam.pos(),
1027 Errors.IntfAnnotationMembersCantHaveParams);
1028
1029 // Attribute all value parameters.
1030 for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) {
1031 attribStat(l.head, localEnv);
1032 }
1033
1034 chk.checkVarargsMethodDecl(localEnv, tree);
1035
1036 // Check that type parameters are well-formed.
1037 chk.validate(tree.typarams, localEnv);
1038
1039 // Check that result type is well-formed.
1040 if (tree.restype != null && !tree.restype.type.hasTag(VOID))
1041 chk.validate(tree.restype, localEnv);
1042
1043 // Check that receiver type is well-formed.
1044 if (tree.recvparam != null) {
1045 // Use a new environment to check the receiver parameter.
1046 // Otherwise I get "might not have been initialized" errors.
1047 // Is there a better way?
1048 Env<AttrContext> newEnv = memberEnter.methodEnv(tree, env);
1049 attribType(tree.recvparam, newEnv);
1050 chk.validate(tree.recvparam, newEnv);
1051 }
1052
1053 if (env.enclClass.sym.isRecord() && tree.sym.owner.kind == TYP) {
1054 // lets find if this method is an accessor
1055 Optional<? extends RecordComponent> recordComponent = env.enclClass.sym.getRecordComponents().stream()
1056 .filter(rc -> rc.accessor == tree.sym && (rc.accessor.flags_field & GENERATED_MEMBER) == 0).findFirst();
1057 if (recordComponent.isPresent()) {
1058 // the method is a user defined accessor lets check that everything is fine
1059 if (!tree.sym.isPublic()) {
1060 log.error(tree, Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.MethodMustBePublic));
1061 }
1062 if (!types.isSameType(tree.sym.type.getReturnType(), recordComponent.get().type)) {
1063 log.error(tree, Errors.InvalidAccessorMethodInRecord(env.enclClass.sym,
1064 Fragments.AccessorReturnTypeDoesntMatch(tree.sym, recordComponent.get())));
1065 }
1066 if (tree.sym.type.asMethodType().thrown != null && !tree.sym.type.asMethodType().thrown.isEmpty()) {
1067 log.error(tree,
1068 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodCantThrowException));
1069 }
1070 if (!tree.typarams.isEmpty()) {
1071 log.error(tree,
1072 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodMustNotBeGeneric));
1073 }
1074 if (tree.sym.isStatic()) {
1075 log.error(tree,
1076 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodMustNotBeStatic));
1077 }
1078 }
1079
1080 if (tree.name == names.init) {
1081 // if this a constructor other than the canonical one
1082 if ((tree.sym.flags_field & RECORD) == 0) {
1083 JCMethodInvocation app = TreeInfo.firstConstructorCall(tree);
1084 if (app == null ||
1085 TreeInfo.name(app.meth) != names._this ||
1086 !checkFirstConstructorStat(app, tree, false)) {
1087 log.error(tree, Errors.FirstStatementMustBeCallToAnotherConstructor(env.enclClass.sym));
1088 }
1089 } else {
1090 // but if it is the canonical:
1091
1092 /* if user generated, then it shouldn't:
1093 * - have an accessibility stricter than that of the record type
1094 * - explicitly invoke any other constructor
1095 */
1096 if ((tree.sym.flags_field & GENERATEDCONSTR) == 0) {
1097 if (Check.protection(m.flags()) > Check.protection(env.enclClass.sym.flags())) {
1098 log.error(tree,
1099 (env.enclClass.sym.flags() & AccessFlags) == 0 ?
1100 Errors.InvalidCanonicalConstructorInRecord(
1101 Fragments.Canonical,
1102 env.enclClass.sym.name,
1103 Fragments.CanonicalMustNotHaveStrongerAccess("package")
1104 ) :
1105 Errors.InvalidCanonicalConstructorInRecord(
1106 Fragments.Canonical,
1107 env.enclClass.sym.name,
1108 Fragments.CanonicalMustNotHaveStrongerAccess(asFlagSet(env.enclClass.sym.flags() & AccessFlags))
1109 )
1110 );
1111 }
1112
1113 JCMethodInvocation app = TreeInfo.firstConstructorCall(tree);
1114 if (app != null &&
1115 (TreeInfo.name(app.meth) == names._this ||
1116 TreeInfo.name(app.meth) == names._super) &&
1117 checkFirstConstructorStat(app, tree, false)) {
1118 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1119 Fragments.Canonical, env.enclClass.sym.name,
1120 Fragments.CanonicalMustNotContainExplicitConstructorInvocation));
1121 }
1122 }
1123
1124 // also we want to check that no type variables have been defined
1125 if (!tree.typarams.isEmpty()) {
1126 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1127 Fragments.Canonical, env.enclClass.sym.name, Fragments.CanonicalMustNotDeclareTypeVariables));
1128 }
1129
1130 /* and now we need to check that the constructor's arguments are exactly the same as those of the
1131 * record components
1132 */
1133 List<? extends RecordComponent> recordComponents = env.enclClass.sym.getRecordComponents();
1134 List<Type> recordFieldTypes = TreeInfo.recordFields(env.enclClass).map(vd -> vd.sym.type);
1135 for (JCVariableDecl param: tree.params) {
1136 boolean paramIsVarArgs = (param.sym.flags_field & VARARGS) != 0;
1137 if (!types.isSameType(param.type, recordFieldTypes.head) ||
1138 (recordComponents.head.isVarargs() != paramIsVarArgs)) {
1139 log.error(param, Errors.InvalidCanonicalConstructorInRecord(
1140 Fragments.Canonical, env.enclClass.sym.name,
1141 Fragments.TypeMustBeIdenticalToCorrespondingRecordComponentType));
1142 }
1143 recordComponents = recordComponents.tail;
1144 recordFieldTypes = recordFieldTypes.tail;
1145 }
1146 }
1147 }
1148 }
1149
1150 // annotation method checks
1151 if ((owner.flags() & ANNOTATION) != 0) {
1152 // annotation method cannot have throws clause
1153 if (tree.thrown.nonEmpty()) {
1154 log.error(tree.thrown.head.pos(),
1155 Errors.ThrowsNotAllowedInIntfAnnotation);
1156 }
1157 // annotation method cannot declare type-parameters
1158 if (tree.typarams.nonEmpty()) {
1159 log.error(tree.typarams.head.pos(),
1160 Errors.IntfAnnotationMembersCantHaveTypeParams);
1161 }
1162 // validate annotation method's return type (could be an annotation type)
1163 chk.validateAnnotationType(tree.restype);
1164 // ensure that annotation method does not clash with members of Object/Annotation
1165 chk.validateAnnotationMethod(tree.pos(), m);
1166 }
1167
1168 for (List<JCExpression> l = tree.thrown; l.nonEmpty(); l = l.tail)
1169 chk.checkType(l.head.pos(), l.head.type, syms.throwableType);
1170
1171 if (tree.body == null) {
1172 // Empty bodies are only allowed for
1173 // abstract, native, or interface methods, or for methods
1174 // in a retrofit signature class.
1175 if (tree.defaultValue != null) {
1176 if ((owner.flags() & ANNOTATION) == 0)
1177 log.error(tree.pos(),
1178 Errors.DefaultAllowedInIntfAnnotationMember);
1179 }
1180 if (isDefaultMethod || (tree.sym.flags() & (ABSTRACT | NATIVE)) == 0)
1181 log.error(tree.pos(), Errors.MissingMethBodyOrDeclAbstract);
1182 } else {
1183 if ((tree.sym.flags() & (ABSTRACT|DEFAULT|PRIVATE)) == ABSTRACT) {
1184 if ((owner.flags() & INTERFACE) != 0) {
1185 log.error(tree.body.pos(), Errors.IntfMethCantHaveBody);
1186 } else {
1187 log.error(tree.pos(), Errors.AbstractMethCantHaveBody);
1188 }
1189 } else if ((tree.mods.flags & NATIVE) != 0) {
1190 log.error(tree.pos(), Errors.NativeMethCantHaveBody);
1191 }
1192 // Add an implicit super() call unless an explicit call to
1193 // super(...) or this(...) is given
1194 // or we are compiling class java.lang.Object.
1195 if (tree.name == names.init && owner.type != syms.objectType) {
1196 JCBlock body = tree.body;
1197 if (body.stats.isEmpty() ||
1198 TreeInfo.getConstructorInvocationName(body.stats, names, true) == names.empty) {
1199 JCStatement supCall = make.at(body.pos).Exec(make.Apply(List.nil(),
1200 make.Ident(names._super), make.Idents(List.nil())));
1201 body.stats = body.stats.prepend(supCall);
1202 } else if ((env.enclClass.sym.flags() & ENUM) != 0 &&
1203 (tree.mods.flags & GENERATEDCONSTR) == 0 &&
1204 TreeInfo.isSuperCall(body.stats.head)) {
1205 // enum constructors are not allowed to call super
1206 // directly, so make sure there aren't any super calls
1207 // in enum constructors, except in the compiler
1208 // generated one.
1209 log.error(tree.body.stats.head.pos(),
1210 Errors.CallToSuperNotAllowedInEnumCtor(env.enclClass.sym));
1211 } else if ((env.enclClass.sym.flags() & VALUE_CLASS) != 0 &&
1212 (tree.mods.flags & GENERATEDCONSTR) == 0 &&
1213 TreeInfo.isSuperCall(body.stats.head)) {
1214 // value constructors are not allowed to call super directly,
1215 // but tolerate compiler generated ones, these are ignored during code generation
1216 log.error(tree.body.stats.head.pos(), Errors.CallToSuperNotAllowedInValueCtor);
1217 }
1218 if (env.enclClass.sym.isRecord() && (tree.sym.flags_field & RECORD) != 0) { // we are seeing the canonical constructor
1219 List<Name> recordComponentNames = TreeInfo.recordFields(env.enclClass).map(vd -> vd.sym.name);
1220 List<Name> initParamNames = tree.sym.params.map(p -> p.name);
1221 if (!initParamNames.equals(recordComponentNames)) {
1222 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1223 Fragments.Canonical, env.enclClass.sym.name, Fragments.CanonicalWithNameMismatch));
1224 }
1225 if (tree.sym.type.asMethodType().thrown != null && !tree.sym.type.asMethodType().thrown.isEmpty()) {
1226 log.error(tree,
1227 Errors.InvalidCanonicalConstructorInRecord(
1228 TreeInfo.isCompactConstructor(tree) ? Fragments.Compact : Fragments.Canonical,
1229 env.enclClass.sym.name,
1230 Fragments.ThrowsClauseNotAllowedForCanonicalConstructor(
1231 TreeInfo.isCompactConstructor(tree) ? Fragments.Compact : Fragments.Canonical)));
1232 }
1233 }
1234 }
1235
1236 // Attribute all type annotations in the body
1237 annotate.queueScanTreeAndTypeAnnotate(tree.body, localEnv, m, null);
1238 annotate.flush();
1239
1240 // Attribute method body.
1241 attribStat(tree.body, localEnv);
1242 }
1243
1244 localEnv.info.scope.leave();
1245 result = tree.type = m.type;
1246 } finally {
1247 chk.setLint(prevLint);
1248 chk.setMethod(prevMethod);
1249 }
1250 }
1251
1252 public void visitVarDef(JCVariableDecl tree) {
1253 // Local variables have not been entered yet, so we need to do it now:
1254 if (env.info.scope.owner.kind == MTH || env.info.scope.owner.kind == VAR) {
1255 if (tree.sym != null) {
1256 // parameters have already been entered
1257 env.info.scope.enter(tree.sym);
1258 } else {
1259 if (tree.isImplicitlyTyped() && (tree.getModifiers().flags & PARAMETER) == 0) {
1260 if (tree.init == null) {
1261 //cannot use 'var' without initializer
1262 log.error(tree, Errors.CantInferLocalVarType(tree.name, Fragments.LocalMissingInit));
1263 tree.vartype = make.Erroneous();
1264 } else {
1265 Fragment msg = canInferLocalVarType(tree);
1266 if (msg != null) {
1267 //cannot use 'var' with initializer which require an explicit target
1268 //(e.g. lambda, method reference, array initializer).
1269 log.error(tree, Errors.CantInferLocalVarType(tree.name, msg));
1270 tree.vartype = make.Erroneous();
1271 }
1272 }
1273 }
1274 try {
1275 annotate.blockAnnotations();
1276 memberEnter.memberEnter(tree, env);
1277 } finally {
1278 annotate.unblockAnnotations();
1279 }
1280 }
1281 } else {
1282 if (tree.init != null) {
1283 // Field initializer expression need to be entered.
1284 annotate.queueScanTreeAndTypeAnnotate(tree.init, env, tree.sym, tree.pos());
1285 annotate.flush();
1286 }
1287 }
1288
1289 VarSymbol v = tree.sym;
1290 Lint lint = env.info.lint.augment(v);
1291 Lint prevLint = chk.setLint(lint);
1292
1293 // Check that the variable's declared type is well-formed.
1294 boolean isImplicitLambdaParameter = env.tree.hasTag(LAMBDA) &&
1295 ((JCLambda)env.tree).paramKind == JCLambda.ParameterKind.IMPLICIT &&
1296 (tree.sym.flags() & PARAMETER) != 0;
1297 chk.validate(tree.vartype, env, !isImplicitLambdaParameter && !tree.isImplicitlyTyped());
1298
1299 try {
1300 v.getConstValue(); // ensure compile-time constant initializer is evaluated
1301 deferredLintHandler.flush(tree.pos());
1302 chk.checkDeprecatedAnnotation(tree.pos(), v);
1303
1304 /* Don't want constant propagation/folding for instance fields of primitive classes,
1305 as these can undergo updates via copy on write.
1306 */
1307 if (tree.init != null) {
1308 if ((v.flags_field & FINAL) == 0 || ((v.flags_field & STATIC) == 0 && v.owner.isValueClass()) ||
1309 !memberEnter.needsLazyConstValue(tree.init)) {
1310 // Not a compile-time constant
1311 // Attribute initializer in a new environment
1312 // with the declared variable as owner.
1313 // Check that initializer conforms to variable's declared type.
1314 Env<AttrContext> initEnv = memberEnter.initEnv(tree, env);
1315 initEnv.info.lint = lint;
1316 // In order to catch self-references, we set the variable's
1317 // declaration position to maximal possible value, effectively
1318 // marking the variable as undefined.
1319 initEnv.info.enclVar = v;
1320 attribExpr(tree.init, initEnv, v.type);
1321 if (tree.isImplicitlyTyped()) {
1322 //fixup local variable type
1323 v.type = chk.checkLocalVarType(tree, tree.init.type, tree.name);
1324 }
1325 }
1326 if (tree.isImplicitlyTyped()) {
1327 setSyntheticVariableType(tree, v.type);
1328 }
1329 }
1330 result = tree.type = v.type;
1331 if (env.enclClass.sym.isRecord() && tree.sym.owner.kind == TYP && !v.isStatic()) {
1332 if (isNonArgsMethodInObject(v.name)) {
1333 log.error(tree, Errors.IllegalRecordComponentName(v));
1334 }
1335 }
1336 }
1337 finally {
1338 chk.setLint(prevLint);
1339 }
1340 }
1341
1342 private boolean isNonArgsMethodInObject(Name name) {
1343 for (Symbol s : syms.objectType.tsym.members().getSymbolsByName(name, s -> s.kind == MTH)) {
1344 if (s.type.getParameterTypes().isEmpty()) {
1345 return true;
1346 }
1347 }
1348 // isValueObject is not included in Object yet so we need a work around
1349 return name == names.isValueObject;
1350 }
1351
1352 Fragment canInferLocalVarType(JCVariableDecl tree) {
1353 LocalInitScanner lis = new LocalInitScanner();
1354 lis.scan(tree.init);
1355 return lis.badInferenceMsg;
1356 }
1357
1358 static class LocalInitScanner extends TreeScanner {
1359 Fragment badInferenceMsg = null;
1360 boolean needsTarget = true;
1361
1362 @Override
1363 public void visitNewArray(JCNewArray tree) {
1364 if (tree.elemtype == null && needsTarget) {
1365 badInferenceMsg = Fragments.LocalArrayMissingTarget;
1366 }
1367 }
1368
1369 @Override
1370 public void visitLambda(JCLambda tree) {
1371 if (needsTarget) {
1372 badInferenceMsg = Fragments.LocalLambdaMissingTarget;
1373 }
1374 }
1375
1376 @Override
1377 public void visitTypeCast(JCTypeCast tree) {
1378 boolean prevNeedsTarget = needsTarget;
1379 try {
1380 needsTarget = false;
1381 super.visitTypeCast(tree);
1382 } finally {
1383 needsTarget = prevNeedsTarget;
1384 }
1385 }
1386
1387 @Override
1388 public void visitReference(JCMemberReference tree) {
1389 if (needsTarget) {
1390 badInferenceMsg = Fragments.LocalMrefMissingTarget;
1391 }
1392 }
1393
1394 @Override
1395 public void visitNewClass(JCNewClass tree) {
1396 boolean prevNeedsTarget = needsTarget;
1397 try {
1398 needsTarget = false;
1399 super.visitNewClass(tree);
1400 } finally {
1401 needsTarget = prevNeedsTarget;
1402 }
1403 }
1404
1405 @Override
1406 public void visitApply(JCMethodInvocation tree) {
1407 boolean prevNeedsTarget = needsTarget;
1408 try {
1409 needsTarget = false;
1410 super.visitApply(tree);
1411 } finally {
1412 needsTarget = prevNeedsTarget;
1413 }
1414 }
1415 }
1416
1417 public void visitSkip(JCSkip tree) {
1418 result = null;
1419 }
1420
1421 public void visitBlock(JCBlock tree) {
1422 if (env.info.scope.owner.kind == TYP || env.info.scope.owner.kind == ERR) {
1423 // Block is a static or instance initializer;
1424 // let the owner of the environment be a freshly
1425 // created BLOCK-method.
1426 Symbol fakeOwner =
1427 new MethodSymbol(tree.flags | BLOCK |
1428 env.info.scope.owner.flags() & STRICTFP, names.empty, null,
1429 env.info.scope.owner);
1430 final Env<AttrContext> localEnv =
1431 env.dup(tree, env.info.dup(env.info.scope.dupUnshared(fakeOwner)));
1432
1433 if ((tree.flags & STATIC) != 0) localEnv.info.staticLevel++;
1434 // Attribute all type annotations in the block
1435 annotate.queueScanTreeAndTypeAnnotate(tree, localEnv, localEnv.info.scope.owner, null);
1436 annotate.flush();
1437 attribStats(tree.stats, localEnv);
1438
1439 {
1440 // Store init and clinit type annotations with the ClassSymbol
1441 // to allow output in Gen.normalizeDefs.
1442 ClassSymbol cs = (ClassSymbol)env.info.scope.owner;
1443 List<Attribute.TypeCompound> tas = localEnv.info.scope.owner.getRawTypeAttributes();
1444 if ((tree.flags & STATIC) != 0) {
1445 cs.appendClassInitTypeAttributes(tas);
1446 } else {
1447 cs.appendInitTypeAttributes(tas);
1448 }
1449 }
1450 } else {
1451 // Create a new local environment with a local scope.
1452 Env<AttrContext> localEnv =
1453 env.dup(tree, env.info.dup(env.info.scope.dup()));
1454 try {
1455 attribStats(tree.stats, localEnv);
1456 } finally {
1457 localEnv.info.scope.leave();
1458 }
1459 }
1460 result = null;
1461 }
1462
1463 public void visitDoLoop(JCDoWhileLoop tree) {
1464 attribStat(tree.body, env.dup(tree));
1465 attribExpr(tree.cond, env, syms.booleanType);
1466 if (!breaksOutOf(tree, tree.body)) {
1467 //include condition's body when false after the while, if cannot get out of the loop
1468 MatchBindings condBindings = matchBindings;
1469 condBindings.bindingsWhenFalse.forEach(env.info.scope::enter);
1470 condBindings.bindingsWhenFalse.forEach(BindingSymbol::preserveBinding);
1471 }
1472 result = null;
1473 }
1474
1475 public void visitWhileLoop(JCWhileLoop tree) {
1476 attribExpr(tree.cond, env, syms.booleanType);
1477 MatchBindings condBindings = matchBindings;
1478 // include condition's bindings when true in the body:
1479 Env<AttrContext> whileEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
1480 try {
1481 attribStat(tree.body, whileEnv.dup(tree));
1482 } finally {
1483 whileEnv.info.scope.leave();
1484 }
1485 if (!breaksOutOf(tree, tree.body)) {
1486 //include condition's bindings when false after the while, if cannot get out of the loop
1487 condBindings.bindingsWhenFalse.forEach(env.info.scope::enter);
1488 condBindings.bindingsWhenFalse.forEach(BindingSymbol::preserveBinding);
1489 }
1490 result = null;
1491 }
1492
1493 private boolean breaksOutOf(JCTree loop, JCTree body) {
1494 preFlow(body);
1495 return flow.breaksOutOf(env, loop, body, make);
1496 }
1497
1498 public void visitForLoop(JCForLoop tree) {
1499 Env<AttrContext> loopEnv =
1500 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1501 MatchBindings condBindings = MatchBindingsComputer.EMPTY;
1502 try {
1503 attribStats(tree.init, loopEnv);
1504 if (tree.cond != null) {
1505 attribExpr(tree.cond, loopEnv, syms.booleanType);
1506 // include condition's bindings when true in the body and step:
1507 condBindings = matchBindings;
1508 }
1509 Env<AttrContext> bodyEnv = bindingEnv(loopEnv, condBindings.bindingsWhenTrue);
1510 try {
1511 bodyEnv.tree = tree; // before, we were not in loop!
1512 attribStats(tree.step, bodyEnv);
1513 attribStat(tree.body, bodyEnv);
1514 } finally {
1515 bodyEnv.info.scope.leave();
1516 }
1517 result = null;
1518 }
1519 finally {
1520 loopEnv.info.scope.leave();
1521 }
1522 if (!breaksOutOf(tree, tree.body)) {
1523 //include condition's body when false after the while, if cannot get out of the loop
1524 condBindings.bindingsWhenFalse.forEach(env.info.scope::enter);
1525 condBindings.bindingsWhenFalse.forEach(BindingSymbol::preserveBinding);
1526 }
1527 }
1528
1529 public void visitForeachLoop(JCEnhancedForLoop tree) {
1530 Env<AttrContext> loopEnv =
1531 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1532 try {
1533 //the Formal Parameter of a for-each loop is not in the scope when
1534 //attributing the for-each expression; we mimic this by attributing
1535 //the for-each expression first (against original scope).
1536 Type exprType = types.cvarUpperBound(attribExpr(tree.expr, loopEnv));
1537 chk.checkNonVoid(tree.pos(), exprType);
1538 Type elemtype = types.elemtype(exprType); // perhaps expr is an array?
1539 if (elemtype == null) {
1540 // or perhaps expr implements Iterable<T>?
1541 Type base = types.asSuper(exprType.referenceProjectionOrSelf(), syms.iterableType.tsym);
1542 if (base == null) {
1543 log.error(tree.expr.pos(),
1544 Errors.ForeachNotApplicableToType(exprType,
1545 Fragments.TypeReqArrayOrIterable));
1546 elemtype = types.createErrorType(exprType);
1547 } else {
1548 List<Type> iterableParams = base.allparams();
1549 elemtype = iterableParams.isEmpty()
1550 ? syms.objectType
1551 : types.wildUpperBound(iterableParams.head);
1552
1553 // Check the return type of the method iterator().
1554 // This is the bare minimum we need to verify to make sure code generation doesn't crash.
1555 Symbol iterSymbol = rs.resolveInternalMethod(tree.pos(),
1556 loopEnv, types.skipTypeVars(exprType, false), names.iterator, List.nil(), List.nil());
1557 if (types.asSuper(iterSymbol.type.getReturnType().referenceProjectionOrSelf(), syms.iteratorType.tsym) == null) {
1558 log.error(tree.pos(),
1559 Errors.ForeachNotApplicableToType(exprType, Fragments.TypeReqArrayOrIterable));
1560 }
1561 }
1562 }
1563 if (tree.var.isImplicitlyTyped()) {
1564 Type inferredType = chk.checkLocalVarType(tree.var, elemtype, tree.var.name);
1565 setSyntheticVariableType(tree.var, inferredType);
1566 }
1567 attribStat(tree.var, loopEnv);
1568 chk.checkType(tree.expr.pos(), elemtype, tree.var.sym.type);
1569 loopEnv.tree = tree; // before, we were not in loop!
1570 attribStat(tree.body, loopEnv);
1571 result = null;
1572 }
1573 finally {
1574 loopEnv.info.scope.leave();
1575 }
1576 }
1577
1578 public void visitLabelled(JCLabeledStatement tree) {
1579 // Check that label is not used in an enclosing statement
1580 Env<AttrContext> env1 = env;
1581 while (env1 != null && !env1.tree.hasTag(CLASSDEF)) {
1582 if (env1.tree.hasTag(LABELLED) &&
1583 ((JCLabeledStatement) env1.tree).label == tree.label) {
1584 log.error(tree.pos(),
1585 Errors.LabelAlreadyInUse(tree.label));
1586 break;
1587 }
1588 env1 = env1.next;
1589 }
1590
1591 attribStat(tree.body, env.dup(tree));
1592 result = null;
1593 }
1594
1595 public void visitSwitch(JCSwitch tree) {
1596 handleSwitch(tree, tree.selector, tree.cases, (c, caseEnv) -> {
1597 attribStats(c.stats, caseEnv);
1598 });
1599 result = null;
1600 }
1601
1602 public void visitSwitchExpression(JCSwitchExpression tree) {
1603 tree.polyKind = (pt().hasTag(NONE) && pt() != Type.recoveryType && pt() != Infer.anyPoly) ?
1604 PolyKind.STANDALONE : PolyKind.POLY;
1605
1606 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) {
1607 //this means we are returning a poly conditional from void-compatible lambda expression
1608 resultInfo.checkContext.report(tree, diags.fragment(Fragments.SwitchExpressionTargetCantBeVoid));
1609 result = tree.type = types.createErrorType(resultInfo.pt);
1610 return;
1611 }
1612
1613 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ?
1614 unknownExprInfo :
1615 resultInfo.dup(switchExpressionContext(resultInfo.checkContext));
1616
1617 ListBuffer<DiagnosticPosition> caseTypePositions = new ListBuffer<>();
1618 ListBuffer<Type> caseTypes = new ListBuffer<>();
1619
1620 handleSwitch(tree, tree.selector, tree.cases, (c, caseEnv) -> {
1621 caseEnv.info.yieldResult = condInfo;
1622 attribStats(c.stats, caseEnv);
1623 new TreeScanner() {
1624 @Override
1625 public void visitYield(JCYield brk) {
1626 if (brk.target == tree) {
1627 caseTypePositions.append(brk.value != null ? brk.value.pos() : brk.pos());
1628 caseTypes.append(brk.value != null ? brk.value.type : syms.errType);
1629 }
1630 super.visitYield(brk);
1631 }
1632
1633 @Override public void visitClassDef(JCClassDecl tree) {}
1634 @Override public void visitLambda(JCLambda tree) {}
1635 }.scan(c.stats);
1636 });
1637
1638 if (tree.cases.isEmpty()) {
1639 log.error(tree.pos(),
1640 Errors.SwitchExpressionEmpty);
1641 } else if (caseTypes.isEmpty()) {
1642 log.error(tree.pos(),
1643 Errors.SwitchExpressionNoResultExpressions);
1644 }
1645
1646 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ? condType(caseTypePositions.toList(), caseTypes.toList()) : pt();
1647
1648 result = tree.type = check(tree, owntype, KindSelector.VAL, resultInfo);
1649 }
1650 //where:
1651 CheckContext switchExpressionContext(CheckContext checkContext) {
1652 return new Check.NestedCheckContext(checkContext) {
1653 //this will use enclosing check context to check compatibility of
1654 //subexpression against target type; if we are in a method check context,
1655 //depending on whether boxing is allowed, we could have incompatibilities
1656 @Override
1657 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1658 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleTypeInSwitchExpression(details)));
1659 }
1660 };
1661 }
1662
1663 private void handleSwitch(JCTree switchTree,
1664 JCExpression selector,
1665 List<JCCase> cases,
1666 BiConsumer<JCCase, Env<AttrContext>> attribCase) {
1667 Type seltype = attribExpr(selector, env);
1668
1669 Env<AttrContext> switchEnv =
1670 env.dup(switchTree, env.info.dup(env.info.scope.dup()));
1671
1672 try {
1673 boolean enumSwitch = (seltype.tsym.flags() & Flags.ENUM) != 0;
1674 boolean stringSwitch = types.isSameType(seltype, syms.stringType);
1675 boolean errorEnumSwitch = TreeInfo.isErrorEnumSwitch(selector, cases);
1676 boolean patternSwitch;
1677 if (!enumSwitch && !stringSwitch && !errorEnumSwitch &&
1678 !types.isAssignable(seltype, syms.intType)) {
1679 preview.checkSourceLevel(selector.pos(), Feature.PATTERN_SWITCH);
1680 patternSwitch = true;
1681 } else {
1682 patternSwitch = cases.stream()
1683 .flatMap(c -> c.labels.stream())
1684 .anyMatch(l -> l.hasTag(PATTERNCASELABEL));
1685 }
1686
1687 // Attribute all cases and
1688 // check that there are no duplicate case labels or default clauses.
1689 Set<Object> constants = new HashSet<>(); // The set of case constants.
1690 boolean hasDefault = false; // Is there a default label?
1691 boolean hasUnconditionalPattern = false; // Is there a unconditional pattern?
1692 boolean lastPatternErroneous = false; // Has the last pattern erroneous type?
1693 boolean hasNullPattern = false; // Is there a null pattern?
1694 CaseTree.CaseKind caseKind = null;
1695 boolean wasError = false;
1696 MatchBindings prevBindings = null;
1697 for (List<JCCase> l = cases; l.nonEmpty(); l = l.tail) {
1698 JCCase c = l.head;
1699 if (caseKind == null) {
1700 caseKind = c.caseKind;
1701 } else if (caseKind != c.caseKind && !wasError) {
1702 log.error(c.pos(),
1703 Errors.SwitchMixingCaseTypes);
1704 wasError = true;
1705 }
1706 MatchBindings currentBindings = prevBindings;
1707 boolean wasUnconditionalPattern = hasUnconditionalPattern;
1708 for (JCCaseLabel label : c.labels) {
1709 if (label instanceof JCConstantCaseLabel constLabel) {
1710 JCExpression expr = constLabel.expr;
1711 if (TreeInfo.isNull(expr)) {
1712 preview.checkSourceLevel(expr.pos(), Feature.CASE_NULL);
1713 if (hasNullPattern) {
1714 log.error(label.pos(), Errors.DuplicateCaseLabel);
1715 }
1716 hasNullPattern = true;
1717 attribExpr(expr, switchEnv, seltype);
1718 matchBindings = new MatchBindings(matchBindings.bindingsWhenTrue, matchBindings.bindingsWhenFalse, true);
1719 } else if (enumSwitch) {
1720 Symbol sym = enumConstant(expr, seltype);
1721 if (sym == null) {
1722 log.error(expr.pos(), Errors.EnumLabelMustBeUnqualifiedEnum);
1723 } else if (!constants.add(sym)) {
1724 log.error(label.pos(), Errors.DuplicateCaseLabel);
1725 }
1726 } else if (errorEnumSwitch) {
1727 //error recovery: the selector is erroneous, and all the case labels
1728 //are identifiers. This could be an enum switch - don't report resolve
1729 //error for the case label:
1730 var prevResolveHelper = rs.basicLogResolveHelper;
1731 try {
1732 rs.basicLogResolveHelper = rs.silentLogResolveHelper;
1733 attribExpr(expr, switchEnv, seltype);
1734 } finally {
1735 rs.basicLogResolveHelper = prevResolveHelper;
1736 }
1737 } else {
1738 ResultInfo valTypInfo = new ResultInfo(KindSelector.VAL_TYP,
1739 !seltype.hasTag(ERROR) ? seltype
1740 : Type.noType);
1741 Type pattype = attribTree(expr, switchEnv, valTypInfo);
1742 if (!pattype.hasTag(ERROR)) {
1743 if (pattype.constValue() == null) {
1744 Symbol s = TreeInfo.symbol(expr);
1745 if (s != null && s.kind == TYP && allowPatternSwitch) {
1746 log.error(expr.pos(),
1747 Errors.PatternExpected);
1748 } else {
1749 log.error(expr.pos(),
1750 (stringSwitch ? Errors.StringConstReq : Errors.ConstExprReq));
1751 }
1752 } else if (!stringSwitch && !types.isAssignable(seltype, syms.intType)) {
1753 log.error(label.pos(), Errors.ConstantLabelNotCompatible(pattype, seltype));
1754 } else if (!constants.add(pattype.constValue())) {
1755 log.error(c.pos(), Errors.DuplicateCaseLabel);
1756 }
1757 }
1758 }
1759 } else if (label instanceof JCDefaultCaseLabel def) {
1760 if (hasDefault) {
1761 log.error(label.pos(), Errors.DuplicateDefaultLabel);
1762 } else if (hasUnconditionalPattern) {
1763 log.error(label.pos(), Errors.UnconditionalPatternAndDefault);
1764 }
1765 hasDefault = true;
1766 matchBindings = MatchBindingsComputer.EMPTY;
1767 } else if (label instanceof JCPatternCaseLabel patternlabel) {
1768 //pattern
1769 JCPattern pat = patternlabel.pat;
1770 attribExpr(pat, switchEnv);
1771 Type primaryType = TreeInfo.primaryPatternType(pat);
1772 if (!primaryType.hasTag(TYPEVAR)) {
1773 primaryType = chk.checkClassOrArrayType(pat.pos(), primaryType);
1774 }
1775 checkCastablePattern(pat.pos(), seltype, primaryType);
1776 Type patternType = types.erasure(primaryType);
1777 JCExpression guard = patternlabel.guard;
1778 if (guard != null) {
1779 MatchBindings afterPattern = matchBindings;
1780 Env<AttrContext> bodyEnv = bindingEnv(switchEnv, matchBindings.bindingsWhenTrue);
1781 try {
1782 attribExpr(guard, bodyEnv, syms.booleanType);
1783 } finally {
1784 bodyEnv.info.scope.leave();
1785 }
1786 matchBindings = matchBindingsComputer.caseGuard(c, afterPattern, matchBindings);
1787
1788 if (TreeInfo.isBooleanWithValue(guard, 0)) {
1789 log.error(guard.pos(), Errors.GuardHasConstantExpressionFalse);
1790 }
1791 }
1792 boolean unguarded = TreeInfo.unguardedCaseLabel(label) && !pat.hasTag(RECORDPATTERN);
1793 boolean unconditional =
1794 unguarded &&
1795 !patternType.isErroneous() &&
1796 types.isSubtype(types.boxedTypeOrType(types.erasure(seltype)),
1797 patternType);
1798 if (unconditional) {
1799 if (hasUnconditionalPattern) {
1800 log.error(pat.pos(), Errors.DuplicateUnconditionalPattern);
1801 } else if (hasDefault) {
1802 log.error(pat.pos(), Errors.UnconditionalPatternAndDefault);
1803 }
1804 hasUnconditionalPattern = true;
1805 }
1806 lastPatternErroneous = patternType.isErroneous();
1807 } else {
1808 Assert.error();
1809 }
1810 currentBindings = matchBindingsComputer.switchCase(label, currentBindings, matchBindings);
1811 }
1812
1813 Env<AttrContext> caseEnv =
1814 bindingEnv(switchEnv, c, currentBindings.bindingsWhenTrue);
1815 try {
1816 attribCase.accept(c, caseEnv);
1817 } finally {
1818 caseEnv.info.scope.leave();
1819 }
1820 addVars(c.stats, switchEnv.info.scope);
1821
1822 preFlow(c);
1823 c.completesNormally = flow.aliveAfter(caseEnv, c, make);
1824
1825 prevBindings = c.caseKind == CaseTree.CaseKind.STATEMENT && c.completesNormally ? currentBindings
1826 : null;
1827 }
1828 if (patternSwitch) {
1829 chk.checkSwitchCaseStructure(cases);
1830 chk.checkSwitchCaseLabelDominated(cases);
1831 }
1832 if (switchTree.hasTag(SWITCH)) {
1833 ((JCSwitch) switchTree).hasUnconditionalPattern =
1834 hasDefault || hasUnconditionalPattern || lastPatternErroneous;
1835 ((JCSwitch) switchTree).patternSwitch = patternSwitch;
1836 } else if (switchTree.hasTag(SWITCH_EXPRESSION)) {
1837 ((JCSwitchExpression) switchTree).hasUnconditionalPattern =
1838 hasDefault || hasUnconditionalPattern || lastPatternErroneous;
1839 ((JCSwitchExpression) switchTree).patternSwitch = patternSwitch;
1840 } else {
1841 Assert.error(switchTree.getTag().name());
1842 }
1843 } finally {
1844 switchEnv.info.scope.leave();
1845 }
1846 }
1847 // where
1848 /** Add any variables defined in stats to the switch scope. */
1849 private static void addVars(List<JCStatement> stats, WriteableScope switchScope) {
1850 for (;stats.nonEmpty(); stats = stats.tail) {
1851 JCTree stat = stats.head;
1852 if (stat.hasTag(VARDEF))
1853 switchScope.enter(((JCVariableDecl) stat).sym);
1854 }
1855 }
1856 // where
1857 /** Return the selected enumeration constant symbol, or null. */
1858 private Symbol enumConstant(JCTree tree, Type enumType) {
1859 if (tree.hasTag(IDENT)) {
1860 JCIdent ident = (JCIdent)tree;
1861 Name name = ident.name;
1862 for (Symbol sym : enumType.tsym.members().getSymbolsByName(name)) {
1863 if (sym.kind == VAR) {
1864 Symbol s = ident.sym = sym;
1865 ((VarSymbol)s).getConstValue(); // ensure initializer is evaluated
1866 ident.type = s.type;
1867 return ((s.flags_field & Flags.ENUM) == 0)
1868 ? null : s;
1869 }
1870 }
1871 }
1872 return null;
1873 }
1874
1875 public void visitSynchronized(JCSynchronized tree) {
1876 chk.checkIdentityType(tree.pos(), attribExpr(tree.lock, env));
1877 if (env.info.lint.isEnabled(LintCategory.SYNCHRONIZATION) && isValueBased(tree.lock.type)) {
1878 log.warning(LintCategory.SYNCHRONIZATION, tree.pos(), Warnings.AttemptToSynchronizeOnInstanceOfValueBasedClass);
1879 }
1880 attribStat(tree.body, env);
1881 result = null;
1882 }
1883 // where
1884 private boolean isValueBased(Type t) {
1885 return t != null && t.tsym != null && (t.tsym.flags() & VALUE_BASED) != 0;
1886 }
1887
1888
1889 public void visitTry(JCTry tree) {
1890 // Create a new local environment with a local
1891 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
1892 try {
1893 boolean isTryWithResource = tree.resources.nonEmpty();
1894 // Create a nested environment for attributing the try block if needed
1895 Env<AttrContext> tryEnv = isTryWithResource ?
1896 env.dup(tree, localEnv.info.dup(localEnv.info.scope.dup())) :
1897 localEnv;
1898 try {
1899 // Attribute resource declarations
1900 for (JCTree resource : tree.resources) {
1901 CheckContext twrContext = new Check.NestedCheckContext(resultInfo.checkContext) {
1902 @Override
1903 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1904 chk.basicHandler.report(pos, diags.fragment(Fragments.TryNotApplicableToType(details)));
1905 }
1906 };
1907 ResultInfo twrResult =
1908 new ResultInfo(KindSelector.VAR,
1909 syms.autoCloseableType,
1910 twrContext);
1911 if (resource.hasTag(VARDEF)) {
1912 attribStat(resource, tryEnv);
1913 twrResult.check(resource, resource.type);
1914
1915 //check that resource type cannot throw InterruptedException
1916 checkAutoCloseable(resource.pos(), localEnv, resource.type);
1917
1918 VarSymbol var = ((JCVariableDecl) resource).sym;
1919
1920 var.flags_field |= Flags.FINAL;
1921 var.setData(ElementKind.RESOURCE_VARIABLE);
1922 } else {
1923 attribTree(resource, tryEnv, twrResult);
1924 }
1925 }
1926 // Attribute body
1927 attribStat(tree.body, tryEnv);
1928 } finally {
1929 if (isTryWithResource)
1930 tryEnv.info.scope.leave();
1931 }
1932
1933 // Attribute catch clauses
1934 for (List<JCCatch> l = tree.catchers; l.nonEmpty(); l = l.tail) {
1935 JCCatch c = l.head;
1936 Env<AttrContext> catchEnv =
1937 localEnv.dup(c, localEnv.info.dup(localEnv.info.scope.dup()));
1938 try {
1939 Type ctype = attribStat(c.param, catchEnv);
1940 if (TreeInfo.isMultiCatch(c)) {
1941 //multi-catch parameter is implicitly marked as final
1942 c.param.sym.flags_field |= FINAL | UNION;
1943 }
1944 if (c.param.sym.kind == VAR) {
1945 c.param.sym.setData(ElementKind.EXCEPTION_PARAMETER);
1946 }
1947 chk.checkType(c.param.vartype.pos(),
1948 chk.checkClassType(c.param.vartype.pos(), ctype),
1949 syms.throwableType);
1950 attribStat(c.body, catchEnv);
1951 } finally {
1952 catchEnv.info.scope.leave();
1953 }
1954 }
1955
1956 // Attribute finalizer
1957 if (tree.finalizer != null) attribStat(tree.finalizer, localEnv);
1958 result = null;
1959 }
1960 finally {
1961 localEnv.info.scope.leave();
1962 }
1963 }
1964
1965 void checkAutoCloseable(DiagnosticPosition pos, Env<AttrContext> env, Type resource) {
1966 if (!resource.isErroneous() &&
1967 types.asSuper(resource.referenceProjectionOrSelf(), syms.autoCloseableType.tsym) != null &&
1968 !types.isSameType(resource, syms.autoCloseableType)) { // Don't emit warning for AutoCloseable itself
1969 Symbol close = syms.noSymbol;
1970 Log.DiagnosticHandler discardHandler = new Log.DiscardDiagnosticHandler(log);
1971 try {
1972 close = rs.resolveQualifiedMethod(pos,
1973 env,
1974 types.skipTypeVars(resource, false),
1975 names.close,
1976 List.nil(),
1977 List.nil());
1978 }
1979 finally {
1980 log.popDiagnosticHandler(discardHandler);
1981 }
1982 if (close.kind == MTH &&
1983 close.overrides(syms.autoCloseableClose, resource.tsym, types, true) &&
1984 chk.isHandled(syms.interruptedExceptionType, types.memberType(resource, close).getThrownTypes()) &&
1985 env.info.lint.isEnabled(LintCategory.TRY)) {
1986 log.warning(LintCategory.TRY, pos, Warnings.TryResourceThrowsInterruptedExc(resource));
1987 }
1988 }
1989 }
1990
1991 public void visitConditional(JCConditional tree) {
1992 Type condtype = attribExpr(tree.cond, env, syms.booleanType);
1993 MatchBindings condBindings = matchBindings;
1994
1995 tree.polyKind = (pt().hasTag(NONE) && pt() != Type.recoveryType && pt() != Infer.anyPoly ||
1996 isBooleanOrNumeric(env, tree)) ?
1997 PolyKind.STANDALONE : PolyKind.POLY;
1998
1999 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) {
2000 //this means we are returning a poly conditional from void-compatible lambda expression
2001 resultInfo.checkContext.report(tree, diags.fragment(Fragments.ConditionalTargetCantBeVoid));
2002 result = tree.type = types.createErrorType(resultInfo.pt);
2003 return;
2004 }
2005
2006 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ?
2007 unknownExprInfo :
2008 resultInfo.dup(conditionalContext(resultInfo.checkContext));
2009
2010
2011 // x ? y : z
2012 // include x's bindings when true in y
2013 // include x's bindings when false in z
2014
2015 Type truetype;
2016 Env<AttrContext> trueEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
2017 try {
2018 truetype = attribTree(tree.truepart, trueEnv, condInfo);
2019 } finally {
2020 trueEnv.info.scope.leave();
2021 }
2022
2023 MatchBindings trueBindings = matchBindings;
2024
2025 Type falsetype;
2026 Env<AttrContext> falseEnv = bindingEnv(env, condBindings.bindingsWhenFalse);
2027 try {
2028 falsetype = attribTree(tree.falsepart, falseEnv, condInfo);
2029 } finally {
2030 falseEnv.info.scope.leave();
2031 }
2032
2033 MatchBindings falseBindings = matchBindings;
2034
2035 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ?
2036 condType(List.of(tree.truepart.pos(), tree.falsepart.pos()),
2037 List.of(truetype, falsetype)) : pt();
2038 if (condtype.constValue() != null &&
2039 truetype.constValue() != null &&
2040 falsetype.constValue() != null &&
2041 !owntype.hasTag(NONE)) {
2042 //constant folding
2043 owntype = cfolder.coerce(condtype.isTrue() ? truetype : falsetype, owntype);
2044 }
2045 result = check(tree, owntype, KindSelector.VAL, resultInfo);
2046 matchBindings = matchBindingsComputer.conditional(tree, condBindings, trueBindings, falseBindings);
2047 }
2048 //where
2049 private boolean isBooleanOrNumeric(Env<AttrContext> env, JCExpression tree) {
2050 switch (tree.getTag()) {
2051 case LITERAL: return ((JCLiteral)tree).typetag.isSubRangeOf(DOUBLE) ||
2052 ((JCLiteral)tree).typetag == BOOLEAN ||
2053 ((JCLiteral)tree).typetag == BOT;
2054 case LAMBDA: case REFERENCE: return false;
2055 case PARENS: return isBooleanOrNumeric(env, ((JCParens)tree).expr);
2056 case CONDEXPR:
2057 JCConditional condTree = (JCConditional)tree;
2058 return isBooleanOrNumeric(env, condTree.truepart) &&
2059 isBooleanOrNumeric(env, condTree.falsepart);
2060 case APPLY:
2061 JCMethodInvocation speculativeMethodTree =
2062 (JCMethodInvocation)deferredAttr.attribSpeculative(
2063 tree, env, unknownExprInfo,
2064 argumentAttr.withLocalCacheContext());
2065 Symbol msym = TreeInfo.symbol(speculativeMethodTree.meth);
2066 Type receiverType = speculativeMethodTree.meth.hasTag(IDENT) ?
2067 env.enclClass.type :
2068 ((JCFieldAccess)speculativeMethodTree.meth).selected.type;
2069 Type owntype = types.memberType(receiverType, msym).getReturnType();
2070 return primitiveOrBoxed(owntype);
2071 case NEWCLASS:
2072 JCExpression className =
2073 removeClassParams.translate(((JCNewClass)tree).clazz);
2074 JCExpression speculativeNewClassTree =
2075 (JCExpression)deferredAttr.attribSpeculative(
2076 className, env, unknownTypeInfo,
2077 argumentAttr.withLocalCacheContext());
2078 return primitiveOrBoxed(speculativeNewClassTree.type);
2079 default:
2080 Type speculativeType = deferredAttr.attribSpeculative(tree, env, unknownExprInfo,
2081 argumentAttr.withLocalCacheContext()).type;
2082 return primitiveOrBoxed(speculativeType);
2083 }
2084 }
2085 //where
2086 boolean primitiveOrBoxed(Type t) {
2087 return (!t.hasTag(TYPEVAR) && !t.isErroneous() && types.unboxedTypeOrType(t).isPrimitive());
2088 }
2089
2090 TreeTranslator removeClassParams = new TreeTranslator() {
2091 @Override
2092 public void visitTypeApply(JCTypeApply tree) {
2093 result = translate(tree.clazz);
2094 }
2095 };
2096
2097 CheckContext conditionalContext(CheckContext checkContext) {
2098 return new Check.NestedCheckContext(checkContext) {
2099 //this will use enclosing check context to check compatibility of
2100 //subexpression against target type; if we are in a method check context,
2101 //depending on whether boxing is allowed, we could have incompatibilities
2102 @Override
2103 public void report(DiagnosticPosition pos, JCDiagnostic details) {
2104 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleTypeInConditional(details)));
2105 }
2106 };
2107 }
2108
2109 /** Compute the type of a conditional expression, after
2110 * checking that it exists. See JLS 15.25. Does not take into
2111 * account the special case where condition and both arms
2112 * are constants.
2113 *
2114 * @param pos The source position to be used for error
2115 * diagnostics.
2116 * @param thentype The type of the expression's then-part.
2117 * @param elsetype The type of the expression's else-part.
2118 */
2119 Type condType(List<DiagnosticPosition> positions, List<Type> condTypes) {
2120 if (condTypes.isEmpty()) {
2121 return syms.objectType; //TODO: how to handle?
2122 }
2123 Type first = condTypes.head;
2124 // If same type, that is the result
2125 if (condTypes.tail.stream().allMatch(t -> types.isSameType(first, t)))
2126 return first.baseType();
2127
2128 List<Type> unboxedTypes = condTypes.stream()
2129 .map(t -> t.isPrimitive() ? t : types.unboxedType(t))
2130 .collect(List.collector());
2131
2132 // Otherwise, if both arms can be converted to a numeric
2133 // type, return the least numeric type that fits both arms
2134 // (i.e. return larger of the two, or return int if one
2135 // arm is short, the other is char).
2136 if (unboxedTypes.stream().allMatch(t -> t.isPrimitive())) {
2137 // If one arm has an integer subrange type (i.e., byte,
2138 // short, or char), and the other is an integer constant
2139 // that fits into the subrange, return the subrange type.
2140 for (Type type : unboxedTypes) {
2141 if (!type.getTag().isStrictSubRangeOf(INT)) {
2142 continue;
2143 }
2144 if (unboxedTypes.stream().filter(t -> t != type).allMatch(t -> t.hasTag(INT) && types.isAssignable(t, type)))
2145 return type.baseType();
2146 }
2147
2148 for (TypeTag tag : primitiveTags) {
2149 Type candidate = syms.typeOfTag[tag.ordinal()];
2150 if (unboxedTypes.stream().allMatch(t -> types.isSubtype(t, candidate))) {
2151 return candidate;
2152 }
2153 }
2154 }
2155
2156 // Those were all the cases that could result in a primitive. See if primitive boxing and primitive
2157 // value conversions bring about a convergence.
2158 condTypes = condTypes.stream()
2159 .map(t -> t.isPrimitive() ? types.boxedClass(t).type
2160 : t.isReferenceProjection() ? t.valueProjection() : t)
2161 .collect(List.collector());
2162
2163 for (Type type : condTypes) {
2164 if (condTypes.stream().filter(t -> t != type).allMatch(t -> types.isAssignable(t, type)))
2165 return type.baseType();
2166 }
2167
2168 Iterator<DiagnosticPosition> posIt = positions.iterator();
2169
2170 condTypes = condTypes.stream()
2171 .map(t -> chk.checkNonVoid(posIt.next(), t.isPrimitiveClass() ? t.referenceProjection() : t))
2172 .collect(List.collector());
2173
2174 // both are known to be reference types (or projections). The result is
2175 // lub(thentype,elsetype). This cannot fail, as it will
2176 // always be possible to infer "Object" if nothing better.
2177 return types.lub(condTypes.stream()
2178 .map(t -> t.baseType())
2179 .filter(t -> !t.hasTag(BOT))
2180 .collect(List.collector()));
2181 }
2182
2183 static final TypeTag[] primitiveTags = new TypeTag[]{
2184 BYTE,
2185 CHAR,
2186 SHORT,
2187 INT,
2188 LONG,
2189 FLOAT,
2190 DOUBLE,
2191 BOOLEAN,
2192 };
2193
2194 Env<AttrContext> bindingEnv(Env<AttrContext> env, List<BindingSymbol> bindings) {
2195 return bindingEnv(env, env.tree, bindings);
2196 }
2197
2198 Env<AttrContext> bindingEnv(Env<AttrContext> env, JCTree newTree, List<BindingSymbol> bindings) {
2199 Env<AttrContext> env1 = env.dup(newTree, env.info.dup(env.info.scope.dup()));
2200 bindings.forEach(env1.info.scope::enter);
2201 return env1;
2202 }
2203
2204 public void visitIf(JCIf tree) {
2205 attribExpr(tree.cond, env, syms.booleanType);
2206
2207 // if (x) { y } [ else z ]
2208 // include x's bindings when true in y
2209 // include x's bindings when false in z
2210
2211 MatchBindings condBindings = matchBindings;
2212 Env<AttrContext> thenEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
2213
2214 try {
2215 attribStat(tree.thenpart, thenEnv);
2216 } finally {
2217 thenEnv.info.scope.leave();
2218 }
2219
2220 preFlow(tree.thenpart);
2221 boolean aliveAfterThen = flow.aliveAfter(env, tree.thenpart, make);
2222 boolean aliveAfterElse;
2223
2224 if (tree.elsepart != null) {
2225 Env<AttrContext> elseEnv = bindingEnv(env, condBindings.bindingsWhenFalse);
2226 try {
2227 attribStat(tree.elsepart, elseEnv);
2228 } finally {
2229 elseEnv.info.scope.leave();
2230 }
2231 preFlow(tree.elsepart);
2232 aliveAfterElse = flow.aliveAfter(env, tree.elsepart, make);
2233 } else {
2234 aliveAfterElse = true;
2235 }
2236
2237 chk.checkEmptyIf(tree);
2238
2239 List<BindingSymbol> afterIfBindings = List.nil();
2240
2241 if (aliveAfterThen && !aliveAfterElse) {
2242 afterIfBindings = condBindings.bindingsWhenTrue;
2243 } else if (aliveAfterElse && !aliveAfterThen) {
2244 afterIfBindings = condBindings.bindingsWhenFalse;
2245 }
2246
2247 afterIfBindings.forEach(env.info.scope::enter);
2248 afterIfBindings.forEach(BindingSymbol::preserveBinding);
2249
2250 result = null;
2251 }
2252
2253 void preFlow(JCTree tree) {
2254 attrRecover.doRecovery();
2255 new PostAttrAnalyzer() {
2256 @Override
2257 public void scan(JCTree tree) {
2258 if (tree == null ||
2259 (tree.type != null &&
2260 tree.type == Type.stuckType)) {
2261 //don't touch stuck expressions!
2262 return;
2263 }
2264 super.scan(tree);
2265 }
2266
2267 @Override
2268 public void visitClassDef(JCClassDecl that) {
2269 if (that.sym != null) {
2270 // Method preFlow shouldn't visit class definitions
2271 // that have not been entered and attributed.
2272 // See JDK-8254557 and JDK-8203277 for more details.
2273 super.visitClassDef(that);
2274 }
2275 }
2276
2277 @Override
2278 public void visitLambda(JCLambda that) {
2279 if (that.type != null) {
2280 // Method preFlow shouldn't visit lambda expressions
2281 // that have not been entered and attributed.
2282 // See JDK-8254557 and JDK-8203277 for more details.
2283 super.visitLambda(that);
2284 }
2285 }
2286 }.scan(tree);
2287 }
2288
2289 public void visitExec(JCExpressionStatement tree) {
2290 //a fresh environment is required for 292 inference to work properly ---
2291 //see Infer.instantiatePolymorphicSignatureInstance()
2292 Env<AttrContext> localEnv = env.dup(tree);
2293 attribExpr(tree.expr, localEnv);
2294 result = null;
2295 }
2296
2297 public void visitBreak(JCBreak tree) {
2298 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
2299 result = null;
2300 }
2301
2302 public void visitYield(JCYield tree) {
2303 if (env.info.yieldResult != null) {
2304 attribTree(tree.value, env, env.info.yieldResult);
2305 tree.target = findJumpTarget(tree.pos(), tree.getTag(), names.empty, env);
2306 } else {
2307 log.error(tree.pos(), tree.value.hasTag(PARENS)
2308 ? Errors.NoSwitchExpressionQualify
2309 : Errors.NoSwitchExpression);
2310 attribTree(tree.value, env, unknownExprInfo);
2311 }
2312 result = null;
2313 }
2314
2315 public void visitContinue(JCContinue tree) {
2316 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
2317 result = null;
2318 }
2319 //where
2320 /** Return the target of a break, continue or yield statement,
2321 * if it exists, report an error if not.
2322 * Note: The target of a labelled break or continue is the
2323 * (non-labelled) statement tree referred to by the label,
2324 * not the tree representing the labelled statement itself.
2325 *
2326 * @param pos The position to be used for error diagnostics
2327 * @param tag The tag of the jump statement. This is either
2328 * Tree.BREAK or Tree.CONTINUE.
2329 * @param label The label of the jump statement, or null if no
2330 * label is given.
2331 * @param env The environment current at the jump statement.
2332 */
2333 private JCTree findJumpTarget(DiagnosticPosition pos,
2334 JCTree.Tag tag,
2335 Name label,
2336 Env<AttrContext> env) {
2337 Pair<JCTree, Error> jumpTarget = findJumpTargetNoError(tag, label, env);
2338
2339 if (jumpTarget.snd != null) {
2340 log.error(pos, jumpTarget.snd);
2341 }
2342
2343 return jumpTarget.fst;
2344 }
2345 /** Return the target of a break or continue statement, if it exists,
2346 * 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 tag The tag of the jump statement. This is either
2352 * Tree.BREAK or Tree.CONTINUE.
2353 * @param label The label of the jump statement, or null if no
2354 * label is given.
2355 * @param env The environment current at the jump statement.
2356 */
2357 private Pair<JCTree, JCDiagnostic.Error> findJumpTargetNoError(JCTree.Tag tag,
2358 Name label,
2359 Env<AttrContext> env) {
2360 // Search environments outwards from the point of jump.
2361 Env<AttrContext> env1 = env;
2362 JCDiagnostic.Error pendingError = null;
2363 LOOP:
2364 while (env1 != null) {
2365 switch (env1.tree.getTag()) {
2366 case LABELLED:
2367 JCLabeledStatement labelled = (JCLabeledStatement)env1.tree;
2368 if (label == labelled.label) {
2369 // If jump is a continue, check that target is a loop.
2370 if (tag == CONTINUE) {
2371 if (!labelled.body.hasTag(DOLOOP) &&
2372 !labelled.body.hasTag(WHILELOOP) &&
2373 !labelled.body.hasTag(FORLOOP) &&
2374 !labelled.body.hasTag(FOREACHLOOP)) {
2375 pendingError = Errors.NotLoopLabel(label);
2376 }
2377 // Found labelled statement target, now go inwards
2378 // to next non-labelled tree.
2379 return Pair.of(TreeInfo.referencedStatement(labelled), pendingError);
2380 } else {
2381 return Pair.of(labelled, pendingError);
2382 }
2383 }
2384 break;
2385 case DOLOOP:
2386 case WHILELOOP:
2387 case FORLOOP:
2388 case FOREACHLOOP:
2389 if (label == null) return Pair.of(env1.tree, pendingError);
2390 break;
2391 case SWITCH:
2392 if (label == null && tag == BREAK) return Pair.of(env1.tree, null);
2393 break;
2394 case SWITCH_EXPRESSION:
2395 if (tag == YIELD) {
2396 return Pair.of(env1.tree, null);
2397 } else if (tag == BREAK) {
2398 pendingError = Errors.BreakOutsideSwitchExpression;
2399 } else {
2400 pendingError = Errors.ContinueOutsideSwitchExpression;
2401 }
2402 break;
2403 case LAMBDA:
2404 case METHODDEF:
2405 case CLASSDEF:
2406 break LOOP;
2407 default:
2408 }
2409 env1 = env1.next;
2410 }
2411 if (label != null)
2412 return Pair.of(null, Errors.UndefLabel(label));
2413 else if (pendingError != null)
2414 return Pair.of(null, pendingError);
2415 else if (tag == CONTINUE)
2416 return Pair.of(null, Errors.ContOutsideLoop);
2417 else
2418 return Pair.of(null, Errors.BreakOutsideSwitchLoop);
2419 }
2420
2421 public void visitReturn(JCReturn tree) {
2422 // Check that there is an enclosing method which is
2423 // nested within than the enclosing class.
2424 if (env.info.returnResult == null) {
2425 log.error(tree.pos(), Errors.RetOutsideMeth);
2426 } else if (env.info.yieldResult != null) {
2427 log.error(tree.pos(), Errors.ReturnOutsideSwitchExpression);
2428 } else if (!env.info.isLambda &&
2429 !env.info.isNewClass &&
2430 env.enclMethod != null &&
2431 TreeInfo.isCompactConstructor(env.enclMethod)) {
2432 log.error(env.enclMethod,
2433 Errors.InvalidCanonicalConstructorInRecord(Fragments.Compact, env.enclMethod.sym.name, Fragments.CanonicalCantHaveReturnStatement));
2434 } else {
2435 // Attribute return expression, if it exists, and check that
2436 // it conforms to result type of enclosing method.
2437 if (tree.expr != null) {
2438 if (env.info.returnResult.pt.hasTag(VOID)) {
2439 env.info.returnResult.checkContext.report(tree.expr.pos(),
2440 diags.fragment(Fragments.UnexpectedRetVal));
2441 }
2442 attribTree(tree.expr, env, env.info.returnResult);
2443 } else if (!env.info.returnResult.pt.hasTag(VOID) &&
2444 !env.info.returnResult.pt.hasTag(NONE)) {
2445 env.info.returnResult.checkContext.report(tree.pos(),
2446 diags.fragment(Fragments.MissingRetVal(env.info.returnResult.pt)));
2447 }
2448 }
2449 result = null;
2450 }
2451
2452 public void visitThrow(JCThrow tree) {
2453 Type owntype = attribExpr(tree.expr, env, Type.noType);
2454 chk.checkType(tree, owntype, syms.throwableType);
2455 result = null;
2456 }
2457
2458 public void visitAssert(JCAssert tree) {
2459 attribExpr(tree.cond, env, syms.booleanType);
2460 if (tree.detail != null) {
2461 chk.checkNonVoid(tree.detail.pos(), attribExpr(tree.detail, env));
2462 }
2463 result = null;
2464 }
2465
2466 /** Visitor method for method invocations.
2467 * NOTE: The method part of an application will have in its type field
2468 * the return type of the method, not the method's type itself!
2469 */
2470 public void visitApply(JCMethodInvocation tree) {
2471 // The local environment of a method application is
2472 // a new environment nested in the current one.
2473 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
2474
2475 // The types of the actual method arguments.
2476 List<Type> argtypes;
2477
2478 // The types of the actual method type arguments.
2479 List<Type> typeargtypes = null;
2480
2481 Name methName = TreeInfo.name(tree.meth);
2482
2483 boolean isConstructorCall =
2484 methName == names._this || methName == names._super;
2485
2486 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
2487 if (isConstructorCall) {
2488 // We are seeing a ...this(...) or ...super(...) call.
2489 // Check that this is the first statement in a constructor.
2490 checkFirstConstructorStat(tree, env.enclMethod, true);
2491
2492 // Record the fact
2493 // that this is a constructor call (using isSelfCall).
2494 localEnv.info.isSelfCall = true;
2495
2496 // Attribute arguments, yielding list of argument types.
2497 localEnv.info.constructorArgs = true;
2498 KindSelector kind = attribArgs(KindSelector.MTH, tree.args, localEnv, argtypesBuf);
2499 localEnv.info.constructorArgs = false;
2500 argtypes = argtypesBuf.toList();
2501 typeargtypes = attribTypes(tree.typeargs, localEnv);
2502
2503 // Variable `site' points to the class in which the called
2504 // constructor is defined.
2505 Type site = env.enclClass.sym.type;
2506 if (methName == names._super) {
2507 if (site == syms.objectType) {
2508 log.error(tree.meth.pos(), Errors.NoSuperclass(site));
2509 site = types.createErrorType(syms.objectType);
2510 } else {
2511 site = types.supertype(site);
2512 }
2513 }
2514
2515 if (site.hasTag(CLASS)) {
2516 Type encl = site.getEnclosingType();
2517 while (encl != null && encl.hasTag(TYPEVAR))
2518 encl = encl.getUpperBound();
2519 if (encl.hasTag(CLASS)) {
2520 // we are calling a nested class
2521
2522 if (tree.meth.hasTag(SELECT)) {
2523 JCTree qualifier = ((JCFieldAccess) tree.meth).selected;
2524
2525 // We are seeing a prefixed call, of the form
2526 // <expr>.super(...).
2527 // Check that the prefix expression conforms
2528 // to the outer instance type of the class.
2529 chk.checkRefType(qualifier.pos(),
2530 attribExpr(qualifier, localEnv,
2531 encl));
2532 } else if (methName == names._super) {
2533 // qualifier omitted; check for existence
2534 // of an appropriate implicit qualifier.
2535 rs.resolveImplicitThis(tree.meth.pos(),
2536 localEnv, site, true);
2537 }
2538 } else if (tree.meth.hasTag(SELECT)) {
2539 log.error(tree.meth.pos(),
2540 Errors.IllegalQualNotIcls(site.tsym));
2541 attribExpr(((JCFieldAccess) tree.meth).selected, localEnv, site);
2542 }
2543
2544 // if we're calling a java.lang.Enum constructor,
2545 // prefix the implicit String and int parameters
2546 if (site.tsym == syms.enumSym)
2547 argtypes = argtypes.prepend(syms.intType).prepend(syms.stringType);
2548
2549 // Resolve the called constructor under the assumption
2550 // that we are referring to a superclass instance of the
2551 // current instance (JLS ???).
2552 boolean selectSuperPrev = localEnv.info.selectSuper;
2553 localEnv.info.selectSuper = true;
2554 localEnv.info.pendingResolutionPhase = null;
2555 Symbol sym = rs.resolveConstructor(
2556 tree.meth.pos(), localEnv, site, argtypes, typeargtypes);
2557 localEnv.info.selectSuper = selectSuperPrev;
2558
2559 // Set method symbol to resolved constructor...
2560 TreeInfo.setSymbol(tree.meth, sym);
2561
2562 // ...and check that it is legal in the current context.
2563 // (this will also set the tree's type)
2564 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
2565 checkId(tree.meth, site, sym, localEnv,
2566 new ResultInfo(kind, mpt));
2567 } else if (site.hasTag(ERROR) && tree.meth.hasTag(SELECT)) {
2568 attribExpr(((JCFieldAccess) tree.meth).selected, localEnv, site);
2569 }
2570 // Otherwise, `site' is an error type and we do nothing
2571 result = tree.type = syms.voidType;
2572 } else {
2573 // Otherwise, we are seeing a regular method call.
2574 // Attribute the arguments, yielding list of argument types, ...
2575 KindSelector kind = attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf);
2576 argtypes = argtypesBuf.toList();
2577 typeargtypes = attribAnyTypes(tree.typeargs, localEnv);
2578
2579 // ... and attribute the method using as a prototype a methodtype
2580 // whose formal argument types is exactly the list of actual
2581 // arguments (this will also set the method symbol).
2582 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
2583 localEnv.info.pendingResolutionPhase = null;
2584 Type mtype = attribTree(tree.meth, localEnv, new ResultInfo(kind, mpt, resultInfo.checkContext));
2585
2586 // Compute the result type.
2587 Type restype = mtype.getReturnType();
2588 if (restype.hasTag(WILDCARD))
2589 throw new AssertionError(mtype);
2590
2591 Type qualifier = (tree.meth.hasTag(SELECT))
2592 ? ((JCFieldAccess) tree.meth).selected.type
2593 : env.enclClass.sym.type;
2594 Symbol msym = TreeInfo.symbol(tree.meth);
2595 restype = adjustMethodReturnType(msym, qualifier, methName, argtypes, restype);
2596
2597 chk.checkRefTypes(tree.typeargs, typeargtypes);
2598
2599 // Check that value of resulting type is admissible in the
2600 // current context. Also, capture the return type
2601 Type capturedRes = resultInfo.checkContext.inferenceContext().cachedCapture(tree, restype, true);
2602 result = check(tree, capturedRes, KindSelector.VAL, resultInfo);
2603 }
2604 chk.validate(tree.typeargs, localEnv);
2605 }
2606 //where
2607 Type adjustMethodReturnType(Symbol msym, Type qualifierType, Name methodName, List<Type> argtypes, Type restype) {
2608 if (msym != null &&
2609 (msym.owner == syms.objectType.tsym || msym.owner.isInterface()) &&
2610 methodName == names.getClass &&
2611 argtypes.isEmpty()) {
2612 // as a special case, x.getClass() has type Class<? extends |X|>
2613 // Special treatment for primitive classes: Given an expression v of type V where
2614 // V is a primitive class, v.getClass() is typed to be Class<? extends |V.ref|>
2615 Type wcb = types.erasure(qualifierType.isPrimitiveClass() ?
2616 qualifierType.referenceProjection() : qualifierType.baseType());
2617 return new ClassType(restype.getEnclosingType(),
2618 List.of(new WildcardType(wcb,
2619 BoundKind.EXTENDS,
2620 syms.boundClass)),
2621 restype.tsym,
2622 restype.getMetadata(),
2623 restype.getFlavor());
2624 } else if (msym != null &&
2625 msym.owner == syms.arrayClass &&
2626 methodName == names.clone &&
2627 types.isArray(qualifierType)) {
2628 // as a special case, array.clone() has a result that is
2629 // the same as static type of the array being cloned
2630 return qualifierType;
2631 } else {
2632 return restype;
2633 }
2634 }
2635
2636 /** Check that given application node appears as first statement
2637 * in a constructor call.
2638 * @param tree The application node
2639 * @param enclMethod The enclosing method of the application.
2640 * @param error Should an error be issued?
2641 */
2642 boolean checkFirstConstructorStat(JCMethodInvocation tree, JCMethodDecl enclMethod, boolean error) {
2643 if (enclMethod != null && enclMethod.name == names.init) {
2644 JCBlock body = enclMethod.body;
2645 if (body.stats.head.hasTag(EXEC) &&
2646 ((JCExpressionStatement) body.stats.head).expr == tree)
2647 return true;
2648 }
2649 if (error) {
2650 log.error(tree.pos(),
2651 Errors.CallMustBeFirstStmtInCtor(TreeInfo.name(tree.meth)));
2652 }
2653 return false;
2654 }
2655
2656 /** Obtain a method type with given argument types.
2657 */
2658 Type newMethodTemplate(Type restype, List<Type> argtypes, List<Type> typeargtypes) {
2659 MethodType mt = new MethodType(argtypes, restype, List.nil(), syms.methodClass);
2660 return (typeargtypes == null) ? mt : (Type)new ForAll(typeargtypes, mt);
2661 }
2662
2663 public void visitNewClass(final JCNewClass tree) {
2664 Type owntype = types.createErrorType(tree.type);
2665
2666 // The local environment of a class creation is
2667 // a new environment nested in the current one.
2668 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
2669
2670 // The anonymous inner class definition of the new expression,
2671 // if one is defined by it.
2672 JCClassDecl cdef = tree.def;
2673
2674 // If enclosing class is given, attribute it, and
2675 // complete class name to be fully qualified
2676 JCExpression clazz = tree.clazz; // Class field following new
2677 JCExpression clazzid; // Identifier in class field
2678 JCAnnotatedType annoclazzid; // Annotated type enclosing clazzid
2679 annoclazzid = null;
2680
2681 if (clazz.hasTag(TYPEAPPLY)) {
2682 clazzid = ((JCTypeApply) clazz).clazz;
2683 if (clazzid.hasTag(ANNOTATED_TYPE)) {
2684 annoclazzid = (JCAnnotatedType) clazzid;
2685 clazzid = annoclazzid.underlyingType;
2686 }
2687 } else {
2688 if (clazz.hasTag(ANNOTATED_TYPE)) {
2689 annoclazzid = (JCAnnotatedType) clazz;
2690 clazzid = annoclazzid.underlyingType;
2691 } else {
2692 clazzid = clazz;
2693 }
2694 }
2695
2696 JCExpression clazzid1 = clazzid; // The same in fully qualified form
2697
2698 if (tree.encl != null) {
2699 // We are seeing a qualified new, of the form
2700 // <expr>.new C <...> (...) ...
2701 // In this case, we let clazz stand for the name of the
2702 // allocated class C prefixed with the type of the qualifier
2703 // expression, so that we can
2704 // resolve it with standard techniques later. I.e., if
2705 // <expr> has type T, then <expr>.new C <...> (...)
2706 // yields a clazz T.C.
2707 Type encltype = chk.checkRefType(tree.encl.pos(),
2708 attribExpr(tree.encl, env));
2709 // TODO 308: in <expr>.new C, do we also want to add the type annotations
2710 // from expr to the combined type, or not? Yes, do this.
2711 clazzid1 = make.at(clazz.pos).Select(make.Type(encltype),
2712 ((JCIdent) clazzid).name);
2713
2714 EndPosTable endPosTable = this.env.toplevel.endPositions;
2715 endPosTable.storeEnd(clazzid1, clazzid.getEndPosition(endPosTable));
2716 if (clazz.hasTag(ANNOTATED_TYPE)) {
2717 JCAnnotatedType annoType = (JCAnnotatedType) clazz;
2718 List<JCAnnotation> annos = annoType.annotations;
2719
2720 if (annoType.underlyingType.hasTag(TYPEAPPLY)) {
2721 clazzid1 = make.at(tree.pos).
2722 TypeApply(clazzid1,
2723 ((JCTypeApply) clazz).arguments);
2724 }
2725
2726 clazzid1 = make.at(tree.pos).
2727 AnnotatedType(annos, clazzid1);
2728 } else if (clazz.hasTag(TYPEAPPLY)) {
2729 clazzid1 = make.at(tree.pos).
2730 TypeApply(clazzid1,
2731 ((JCTypeApply) clazz).arguments);
2732 }
2733
2734 clazz = clazzid1;
2735 }
2736
2737 // Attribute clazz expression and store
2738 // symbol + type back into the attributed tree.
2739 Type clazztype;
2740
2741 try {
2742 env.info.isNewClass = true;
2743 clazztype = TreeInfo.isEnumInit(env.tree) ?
2744 attribIdentAsEnumType(env, (JCIdent)clazz) :
2745 attribType(clazz, env);
2746 } finally {
2747 env.info.isNewClass = false;
2748 }
2749
2750 clazztype = chk.checkDiamond(tree, clazztype);
2751 chk.validate(clazz, localEnv);
2752 if (tree.encl != null) {
2753 // We have to work in this case to store
2754 // symbol + type back into the attributed tree.
2755 tree.clazz.type = clazztype;
2756 TreeInfo.setSymbol(clazzid, TreeInfo.symbol(clazzid1));
2757 clazzid.type = ((JCIdent) clazzid).sym.type;
2758 if (annoclazzid != null) {
2759 annoclazzid.type = clazzid.type;
2760 }
2761 if (!clazztype.isErroneous()) {
2762 if (cdef != null && clazztype.tsym.isInterface()) {
2763 log.error(tree.encl.pos(), Errors.AnonClassImplIntfNoQualForNew);
2764 } else if (clazztype.tsym.isStatic()) {
2765 log.error(tree.encl.pos(), Errors.QualifiedNewOfStaticClass(clazztype.tsym));
2766 }
2767 }
2768 } else if (!clazztype.tsym.isInterface() &&
2769 clazztype.getEnclosingType().hasTag(CLASS)) {
2770 // Check for the existence of an apropos outer instance
2771 rs.resolveImplicitThis(tree.pos(), env, clazztype);
2772 }
2773
2774 // Attribute constructor arguments.
2775 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
2776 final KindSelector pkind =
2777 attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf);
2778 List<Type> argtypes = argtypesBuf.toList();
2779 List<Type> typeargtypes = attribTypes(tree.typeargs, localEnv);
2780
2781 if (clazztype.hasTag(CLASS) || clazztype.hasTag(ERROR)) {
2782 // Enums may not be instantiated except implicitly
2783 if ((clazztype.tsym.flags_field & Flags.ENUM) != 0 &&
2784 (!env.tree.hasTag(VARDEF) ||
2785 (((JCVariableDecl) env.tree).mods.flags & Flags.ENUM) == 0 ||
2786 ((JCVariableDecl) env.tree).init != tree))
2787 log.error(tree.pos(), Errors.EnumCantBeInstantiated);
2788
2789 boolean isSpeculativeDiamondInferenceRound = TreeInfo.isDiamond(tree) &&
2790 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
2791 boolean skipNonDiamondPath = false;
2792 // Check that it is an instantiation of a class and not a projection type
2793 if (clazz.hasTag(SELECT)) {
2794 JCFieldAccess fieldAccess = (JCFieldAccess) clazz;
2795 if (fieldAccess.selected.type.isPrimitiveClass() &&
2796 (fieldAccess.name == names.ref || fieldAccess.name == names.val)) {
2797 log.error(tree.pos(), Errors.ProjectionCantBeInstantiated);
2798 }
2799 }
2800 // Check that class is not abstract
2801 if (cdef == null && !isSpeculativeDiamondInferenceRound && // class body may be nulled out in speculative tree copy
2802 (clazztype.tsym.flags() & (ABSTRACT | INTERFACE)) != 0) {
2803 log.error(tree.pos(),
2804 Errors.AbstractCantBeInstantiated(clazztype.tsym));
2805 skipNonDiamondPath = true;
2806 } else if (cdef != null && clazztype.tsym.isInterface()) {
2807 // Check that no constructor arguments are given to
2808 // anonymous classes implementing an interface
2809 if (!argtypes.isEmpty())
2810 log.error(tree.args.head.pos(), Errors.AnonClassImplIntfNoArgs);
2811
2812 if (!typeargtypes.isEmpty())
2813 log.error(tree.typeargs.head.pos(), Errors.AnonClassImplIntfNoTypeargs);
2814
2815 // Error recovery: pretend no arguments were supplied.
2816 argtypes = List.nil();
2817 typeargtypes = List.nil();
2818 skipNonDiamondPath = true;
2819 }
2820 if (TreeInfo.isDiamond(tree)) {
2821 ClassType site = new ClassType(clazztype.getEnclosingType(),
2822 clazztype.tsym.type.getTypeArguments(),
2823 clazztype.tsym,
2824 clazztype.getMetadata(),
2825 clazztype.getFlavor());
2826
2827 Env<AttrContext> diamondEnv = localEnv.dup(tree);
2828 diamondEnv.info.selectSuper = cdef != null || tree.classDeclRemoved();
2829 diamondEnv.info.pendingResolutionPhase = null;
2830
2831 //if the type of the instance creation expression is a class type
2832 //apply method resolution inference (JLS 15.12.2.7). The return type
2833 //of the resolved constructor will be a partially instantiated type
2834 Symbol constructor = rs.resolveDiamond(tree.pos(),
2835 diamondEnv,
2836 site,
2837 argtypes,
2838 typeargtypes);
2839 tree.constructor = constructor.baseSymbol();
2840
2841 final TypeSymbol csym = clazztype.tsym;
2842 ResultInfo diamondResult = new ResultInfo(pkind, newMethodTemplate(resultInfo.pt, argtypes, typeargtypes),
2843 diamondContext(tree, csym, resultInfo.checkContext), CheckMode.NO_TREE_UPDATE);
2844 Type constructorType = tree.constructorType = types.createErrorType(clazztype);
2845 constructorType = checkId(tree, site,
2846 constructor,
2847 diamondEnv,
2848 diamondResult);
2849
2850 tree.clazz.type = types.createErrorType(clazztype);
2851 if (!constructorType.isErroneous()) {
2852 tree.clazz.type = clazz.type = constructorType.getReturnType();
2853 tree.constructorType = types.createMethodTypeWithReturn(constructorType, syms.voidType);
2854 }
2855 clazztype = chk.checkClassType(tree.clazz, tree.clazz.type, true);
2856 }
2857
2858 // Resolve the called constructor under the assumption
2859 // that we are referring to a superclass instance of the
2860 // current instance (JLS ???).
2861 else if (!skipNonDiamondPath) {
2862 //the following code alters some of the fields in the current
2863 //AttrContext - hence, the current context must be dup'ed in
2864 //order to avoid downstream failures
2865 Env<AttrContext> rsEnv = localEnv.dup(tree);
2866 rsEnv.info.selectSuper = cdef != null;
2867 rsEnv.info.pendingResolutionPhase = null;
2868 tree.constructor = rs.resolveConstructor(
2869 tree.pos(), rsEnv, clazztype, argtypes, typeargtypes);
2870 if (cdef == null) { //do not check twice!
2871 tree.constructorType = checkId(tree,
2872 clazztype,
2873 tree.constructor,
2874 rsEnv,
2875 new ResultInfo(pkind, newMethodTemplate(syms.voidType, argtypes, typeargtypes), CheckMode.NO_TREE_UPDATE));
2876 if (rsEnv.info.lastResolveVarargs())
2877 Assert.check(tree.constructorType.isErroneous() || tree.varargsElement != null);
2878 }
2879 }
2880
2881 if (cdef != null) {
2882 visitAnonymousClassDefinition(tree, clazz, clazztype, cdef, localEnv, argtypes, typeargtypes, pkind);
2883 return;
2884 }
2885
2886 if (tree.constructor != null && tree.constructor.kind == MTH)
2887 owntype = clazztype;
2888 }
2889 result = check(tree, owntype, KindSelector.VAL, resultInfo);
2890 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
2891 if (tree.constructorType != null && inferenceContext.free(tree.constructorType)) {
2892 //we need to wait for inference to finish and then replace inference vars in the constructor type
2893 inferenceContext.addFreeTypeListener(List.of(tree.constructorType),
2894 instantiatedContext -> {
2895 tree.constructorType = instantiatedContext.asInstType(tree.constructorType);
2896 });
2897 }
2898 chk.validate(tree.typeargs, localEnv);
2899 }
2900
2901 // where
2902 private void visitAnonymousClassDefinition(JCNewClass tree, JCExpression clazz, Type clazztype,
2903 JCClassDecl cdef, Env<AttrContext> localEnv,
2904 List<Type> argtypes, List<Type> typeargtypes,
2905 KindSelector pkind) {
2906 // We are seeing an anonymous class instance creation.
2907 // In this case, the class instance creation
2908 // expression
2909 //
2910 // E.new <typeargs1>C<typargs2>(args) { ... }
2911 //
2912 // is represented internally as
2913 //
2914 // E . new <typeargs1>C<typargs2>(args) ( class <empty-name> { ... } ) .
2915 //
2916 // This expression is then *transformed* as follows:
2917 //
2918 // (1) add an extends or implements clause
2919 // (2) add a constructor.
2920 //
2921 // For instance, if C is a class, and ET is the type of E,
2922 // the expression
2923 //
2924 // E.new <typeargs1>C<typargs2>(args) { ... }
2925 //
2926 // is translated to (where X is a fresh name and typarams is the
2927 // parameter list of the super constructor):
2928 //
2929 // new <typeargs1>X(<*nullchk*>E, args) where
2930 // X extends C<typargs2> {
2931 // <typarams> X(ET e, args) {
2932 // e.<typeargs1>super(args)
2933 // }
2934 // ...
2935 // }
2936 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
2937 Type enclType = clazztype.getEnclosingType();
2938 if (enclType != null &&
2939 enclType.hasTag(CLASS) &&
2940 !chk.checkDenotable((ClassType)enclType)) {
2941 log.error(tree.encl, Errors.EnclosingClassTypeNonDenotable(enclType));
2942 }
2943 final boolean isDiamond = TreeInfo.isDiamond(tree);
2944 if (isDiamond
2945 && ((tree.constructorType != null && inferenceContext.free(tree.constructorType))
2946 || (tree.clazz.type != null && inferenceContext.free(tree.clazz.type)))) {
2947 final ResultInfo resultInfoForClassDefinition = this.resultInfo;
2948 Env<AttrContext> dupLocalEnv = copyEnv(localEnv);
2949 inferenceContext.addFreeTypeListener(List.of(tree.constructorType, tree.clazz.type),
2950 instantiatedContext -> {
2951 tree.constructorType = instantiatedContext.asInstType(tree.constructorType);
2952 tree.clazz.type = clazz.type = instantiatedContext.asInstType(clazz.type);
2953 ResultInfo prevResult = this.resultInfo;
2954 try {
2955 this.resultInfo = resultInfoForClassDefinition;
2956 visitAnonymousClassDefinition(tree, clazz, clazz.type, cdef,
2957 dupLocalEnv, argtypes, typeargtypes, pkind);
2958 } finally {
2959 this.resultInfo = prevResult;
2960 }
2961 });
2962 } else {
2963 if (isDiamond && clazztype.hasTag(CLASS)) {
2964 List<Type> invalidDiamondArgs = chk.checkDiamondDenotable((ClassType)clazztype);
2965 if (!clazztype.isErroneous() && invalidDiamondArgs.nonEmpty()) {
2966 // One or more types inferred in the previous steps is non-denotable.
2967 Fragment fragment = Diamond(clazztype.tsym);
2968 log.error(tree.clazz.pos(),
2969 Errors.CantApplyDiamond1(
2970 fragment,
2971 invalidDiamondArgs.size() > 1 ?
2972 DiamondInvalidArgs(invalidDiamondArgs, fragment) :
2973 DiamondInvalidArg(invalidDiamondArgs, fragment)));
2974 }
2975 // For <>(){}, inferred types must also be accessible.
2976 for (Type t : clazztype.getTypeArguments()) {
2977 rs.checkAccessibleType(env, t);
2978 }
2979 chk.checkParameterizationByPrimitiveClass(tree, clazztype);
2980 }
2981
2982 // If we already errored, be careful to avoid a further avalanche. ErrorType answers
2983 // false for isInterface call even when the original type is an interface.
2984 boolean implementing = clazztype.tsym.isInterface() ||
2985 clazztype.isErroneous() && !clazztype.getOriginalType().hasTag(NONE) &&
2986 clazztype.getOriginalType().tsym.isInterface();
2987
2988 if (implementing) {
2989 cdef.implementing = List.of(clazz);
2990 } else {
2991 cdef.extending = clazz;
2992 }
2993
2994 if (resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
2995 rs.isSerializable(clazztype)) {
2996 localEnv.info.isSerializable = true;
2997 }
2998
2999 attribStat(cdef, localEnv);
3000
3001 List<Type> finalargtypes;
3002 // If an outer instance is given,
3003 // prefix it to the constructor arguments
3004 // and delete it from the new expression
3005 if (tree.encl != null && !clazztype.tsym.isInterface()) {
3006 finalargtypes = argtypes.prepend(tree.encl.type);
3007 } else {
3008 finalargtypes = argtypes;
3009 }
3010
3011 // Reassign clazztype and recompute constructor. As this necessarily involves
3012 // another attribution pass for deferred types in the case of <>, replicate
3013 // them. Original arguments have right decorations already.
3014 if (isDiamond && pkind.contains(KindSelector.POLY)) {
3015 finalargtypes = finalargtypes.map(deferredAttr.deferredCopier);
3016 }
3017
3018 clazztype = clazztype.hasTag(ERROR) ? types.createErrorType(cdef.sym.type)
3019 : cdef.sym.type;
3020 Symbol sym = tree.constructor = rs.resolveConstructor(
3021 tree.pos(), localEnv, clazztype, finalargtypes, typeargtypes);
3022 Assert.check(!sym.kind.isResolutionError());
3023 tree.constructor = sym;
3024 tree.constructorType = checkId(tree,
3025 clazztype,
3026 tree.constructor,
3027 localEnv,
3028 new ResultInfo(pkind, newMethodTemplate(syms.voidType, finalargtypes, typeargtypes), CheckMode.NO_TREE_UPDATE));
3029 }
3030 Type owntype = (tree.constructor != null && tree.constructor.kind == MTH) ?
3031 clazztype : types.createErrorType(tree.type);
3032 result = check(tree, owntype, KindSelector.VAL, resultInfo.dup(CheckMode.NO_INFERENCE_HOOK));
3033 chk.validate(tree.typeargs, localEnv);
3034 }
3035
3036 CheckContext diamondContext(JCNewClass clazz, TypeSymbol tsym, CheckContext checkContext) {
3037 return new Check.NestedCheckContext(checkContext) {
3038 @Override
3039 public void report(DiagnosticPosition _unused, JCDiagnostic details) {
3040 enclosingContext.report(clazz.clazz,
3041 diags.fragment(Fragments.CantApplyDiamond1(Fragments.Diamond(tsym), details)));
3042 }
3043 };
3044 }
3045
3046 /** Make an attributed null check tree.
3047 */
3048 public JCExpression makeNullCheck(JCExpression arg) {
3049 // optimization: new Outer() can never be null; skip null check
3050 if (arg.getTag() == NEWCLASS)
3051 return arg;
3052 // Likewise arg can't be null if it is a primitive class instance.
3053 if (arg.type.isPrimitiveClass())
3054 return arg;
3055 // optimization: X.this is never null; skip null check
3056 Name name = TreeInfo.name(arg);
3057 if (name == names._this || name == names._super) return arg;
3058
3059 JCTree.Tag optag = NULLCHK;
3060 JCUnary tree = make.at(arg.pos).Unary(optag, arg);
3061 tree.operator = operators.resolveUnary(arg, optag, arg.type);
3062 tree.type = arg.type;
3063 return tree;
3064 }
3065
3066 public void visitNewArray(JCNewArray tree) {
3067 Type owntype = types.createErrorType(tree.type);
3068 Env<AttrContext> localEnv = env.dup(tree);
3069 Type elemtype;
3070 if (tree.elemtype != null) {
3071 elemtype = attribType(tree.elemtype, localEnv);
3072 chk.validate(tree.elemtype, localEnv);
3073 owntype = elemtype;
3074 for (List<JCExpression> l = tree.dims; l.nonEmpty(); l = l.tail) {
3075 attribExpr(l.head, localEnv, syms.intType);
3076 owntype = new ArrayType(owntype, syms.arrayClass);
3077 }
3078 } else {
3079 // we are seeing an untyped aggregate { ... }
3080 // this is allowed only if the prototype is an array
3081 if (pt().hasTag(ARRAY)) {
3082 elemtype = types.elemtype(pt());
3083 } else {
3084 if (!pt().hasTag(ERROR) &&
3085 (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3086 log.error(tree.pos(),
3087 Errors.IllegalInitializerForType(pt()));
3088 }
3089 elemtype = types.createErrorType(pt());
3090 }
3091 }
3092 if (tree.elems != null) {
3093 attribExprs(tree.elems, localEnv, elemtype);
3094 owntype = new ArrayType(elemtype, syms.arrayClass);
3095 }
3096 if (!types.isReifiable(elemtype))
3097 log.error(tree.pos(), Errors.GenericArrayCreation);
3098 result = check(tree, owntype, KindSelector.VAL, resultInfo);
3099 }
3100
3101 /*
3102 * A lambda expression can only be attributed when a target-type is available.
3103 * In addition, if the target-type is that of a functional interface whose
3104 * descriptor contains inference variables in argument position the lambda expression
3105 * is 'stuck' (see DeferredAttr).
3106 */
3107 @Override
3108 public void visitLambda(final JCLambda that) {
3109 boolean wrongContext = false;
3110 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
3111 if (pt().hasTag(NONE) && (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3112 //lambda only allowed in assignment or method invocation/cast context
3113 log.error(that.pos(), Errors.UnexpectedLambda);
3114 }
3115 resultInfo = recoveryInfo;
3116 wrongContext = true;
3117 }
3118 //create an environment for attribution of the lambda expression
3119 final Env<AttrContext> localEnv = lambdaEnv(that, env);
3120 boolean needsRecovery =
3121 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK;
3122 try {
3123 if (needsRecovery && rs.isSerializable(pt())) {
3124 localEnv.info.isSerializable = true;
3125 localEnv.info.isSerializableLambda = true;
3126 }
3127 List<Type> explicitParamTypes = null;
3128 if (that.paramKind == JCLambda.ParameterKind.EXPLICIT) {
3129 //attribute lambda parameters
3130 attribStats(that.params, localEnv);
3131 explicitParamTypes = TreeInfo.types(that.params);
3132 }
3133
3134 TargetInfo targetInfo = getTargetInfo(that, resultInfo, explicitParamTypes);
3135 Type currentTarget = targetInfo.target;
3136 Type lambdaType = targetInfo.descriptor;
3137
3138 if (currentTarget.isErroneous()) {
3139 result = that.type = currentTarget;
3140 return;
3141 }
3142
3143 setFunctionalInfo(localEnv, that, pt(), lambdaType, currentTarget, resultInfo.checkContext);
3144
3145 if (lambdaType.hasTag(FORALL)) {
3146 //lambda expression target desc cannot be a generic method
3147 Fragment msg = Fragments.InvalidGenericLambdaTarget(lambdaType,
3148 kindName(currentTarget.tsym),
3149 currentTarget.tsym);
3150 resultInfo.checkContext.report(that, diags.fragment(msg));
3151 result = that.type = types.createErrorType(pt());
3152 return;
3153 }
3154
3155 if (that.paramKind == JCLambda.ParameterKind.IMPLICIT) {
3156 //add param type info in the AST
3157 List<Type> actuals = lambdaType.getParameterTypes();
3158 List<JCVariableDecl> params = that.params;
3159
3160 boolean arityMismatch = false;
3161
3162 while (params.nonEmpty()) {
3163 if (actuals.isEmpty()) {
3164 //not enough actuals to perform lambda parameter inference
3165 arityMismatch = true;
3166 }
3167 //reset previously set info
3168 Type argType = arityMismatch ?
3169 syms.errType :
3170 actuals.head;
3171 if (params.head.isImplicitlyTyped()) {
3172 setSyntheticVariableType(params.head, argType);
3173 }
3174 params.head.sym = null;
3175 actuals = actuals.isEmpty() ?
3176 actuals :
3177 actuals.tail;
3178 params = params.tail;
3179 }
3180
3181 //attribute lambda parameters
3182 attribStats(that.params, localEnv);
3183
3184 if (arityMismatch) {
3185 resultInfo.checkContext.report(that, diags.fragment(Fragments.IncompatibleArgTypesInLambda));
3186 result = that.type = types.createErrorType(currentTarget);
3187 return;
3188 }
3189 }
3190
3191 //from this point on, no recovery is needed; if we are in assignment context
3192 //we will be able to attribute the whole lambda body, regardless of errors;
3193 //if we are in a 'check' method context, and the lambda is not compatible
3194 //with the target-type, it will be recovered anyway in Attr.checkId
3195 needsRecovery = false;
3196
3197 ResultInfo bodyResultInfo = localEnv.info.returnResult =
3198 lambdaBodyResult(that, lambdaType, resultInfo);
3199
3200 if (that.getBodyKind() == JCLambda.BodyKind.EXPRESSION) {
3201 attribTree(that.getBody(), localEnv, bodyResultInfo);
3202 } else {
3203 JCBlock body = (JCBlock)that.body;
3204 if (body == breakTree &&
3205 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
3206 breakTreeFound(copyEnv(localEnv));
3207 }
3208 attribStats(body.stats, localEnv);
3209 }
3210
3211 result = check(that, currentTarget, KindSelector.VAL, resultInfo);
3212
3213 boolean isSpeculativeRound =
3214 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
3215
3216 preFlow(that);
3217 flow.analyzeLambda(env, that, make, isSpeculativeRound);
3218
3219 that.type = currentTarget; //avoids recovery at this stage
3220 checkLambdaCompatible(that, lambdaType, resultInfo.checkContext);
3221
3222 if (!isSpeculativeRound) {
3223 //add thrown types as bounds to the thrown types free variables if needed:
3224 if (resultInfo.checkContext.inferenceContext().free(lambdaType.getThrownTypes())) {
3225 List<Type> inferredThrownTypes = flow.analyzeLambdaThrownTypes(env, that, make);
3226 if(!checkExConstraints(inferredThrownTypes, lambdaType.getThrownTypes(), resultInfo.checkContext.inferenceContext())) {
3227 log.error(that, Errors.IncompatibleThrownTypesInMref(lambdaType.getThrownTypes()));
3228 }
3229 }
3230
3231 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), lambdaType, currentTarget);
3232 }
3233 result = wrongContext ? that.type = types.createErrorType(pt())
3234 : check(that, currentTarget, KindSelector.VAL, resultInfo);
3235 } catch (Types.FunctionDescriptorLookupError ex) {
3236 JCDiagnostic cause = ex.getDiagnostic();
3237 resultInfo.checkContext.report(that, cause);
3238 result = that.type = types.createErrorType(pt());
3239 return;
3240 } catch (CompletionFailure cf) {
3241 chk.completionError(that.pos(), cf);
3242 } catch (Throwable t) {
3243 //when an unexpected exception happens, avoid attempts to attribute the same tree again
3244 //as that would likely cause the same exception again.
3245 needsRecovery = false;
3246 throw t;
3247 } finally {
3248 localEnv.info.scope.leave();
3249 if (needsRecovery) {
3250 Type prevResult = result;
3251 try {
3252 attribTree(that, env, recoveryInfo);
3253 } finally {
3254 if (result == Type.recoveryType) {
3255 result = prevResult;
3256 }
3257 }
3258 }
3259 }
3260 }
3261 //where
3262 class TargetInfo {
3263 Type target;
3264 Type descriptor;
3265
3266 public TargetInfo(Type target, Type descriptor) {
3267 this.target = target;
3268 this.descriptor = descriptor;
3269 }
3270 }
3271
3272 TargetInfo getTargetInfo(JCPolyExpression that, ResultInfo resultInfo, List<Type> explicitParamTypes) {
3273 Type lambdaType;
3274 Type currentTarget = resultInfo.pt;
3275 if (resultInfo.pt != Type.recoveryType) {
3276 /* We need to adjust the target. If the target is an
3277 * intersection type, for example: SAM & I1 & I2 ...
3278 * the target will be updated to SAM
3279 */
3280 currentTarget = targetChecker.visit(currentTarget, that);
3281 if (!currentTarget.isIntersection()) {
3282 if (explicitParamTypes != null) {
3283 currentTarget = infer.instantiateFunctionalInterface(that,
3284 currentTarget, explicitParamTypes, resultInfo.checkContext);
3285 }
3286 currentTarget = types.removeWildcards(currentTarget);
3287 lambdaType = types.findDescriptorType(currentTarget);
3288 } else {
3289 IntersectionClassType ict = (IntersectionClassType)currentTarget;
3290 ListBuffer<Type> components = new ListBuffer<>();
3291 for (Type bound : ict.getExplicitComponents()) {
3292 if (explicitParamTypes != null) {
3293 try {
3294 bound = infer.instantiateFunctionalInterface(that,
3295 bound, explicitParamTypes, resultInfo.checkContext);
3296 } catch (FunctionDescriptorLookupError t) {
3297 // do nothing
3298 }
3299 }
3300 bound = types.removeWildcards(bound);
3301 components.add(bound);
3302 }
3303 currentTarget = types.makeIntersectionType(components.toList());
3304 currentTarget.tsym.flags_field |= INTERFACE;
3305 lambdaType = types.findDescriptorType(currentTarget);
3306 }
3307
3308 } else {
3309 currentTarget = Type.recoveryType;
3310 lambdaType = fallbackDescriptorType(that);
3311 }
3312 if (that.hasTag(LAMBDA) && lambdaType.hasTag(FORALL)) {
3313 //lambda expression target desc cannot be a generic method
3314 Fragment msg = Fragments.InvalidGenericLambdaTarget(lambdaType,
3315 kindName(currentTarget.tsym),
3316 currentTarget.tsym);
3317 resultInfo.checkContext.report(that, diags.fragment(msg));
3318 currentTarget = types.createErrorType(pt());
3319 }
3320 return new TargetInfo(currentTarget, lambdaType);
3321 }
3322
3323 void preFlow(JCLambda tree) {
3324 attrRecover.doRecovery();
3325 new PostAttrAnalyzer() {
3326 @Override
3327 public void scan(JCTree tree) {
3328 if (tree == null ||
3329 (tree.type != null &&
3330 tree.type == Type.stuckType)) {
3331 //don't touch stuck expressions!
3332 return;
3333 }
3334 super.scan(tree);
3335 }
3336
3337 @Override
3338 public void visitClassDef(JCClassDecl that) {
3339 // or class declaration trees!
3340 }
3341
3342 public void visitLambda(JCLambda that) {
3343 // or lambda expressions!
3344 }
3345 }.scan(tree.body);
3346 }
3347
3348 Types.MapVisitor<DiagnosticPosition> targetChecker = new Types.MapVisitor<DiagnosticPosition>() {
3349
3350 @Override
3351 public Type visitClassType(ClassType t, DiagnosticPosition pos) {
3352 return t.isIntersection() ?
3353 visitIntersectionClassType((IntersectionClassType)t, pos) : t;
3354 }
3355
3356 public Type visitIntersectionClassType(IntersectionClassType ict, DiagnosticPosition pos) {
3357 types.findDescriptorSymbol(makeNotionalInterface(ict, pos));
3358 return ict;
3359 }
3360
3361 private TypeSymbol makeNotionalInterface(IntersectionClassType ict, DiagnosticPosition pos) {
3362 ListBuffer<Type> targs = new ListBuffer<>();
3363 ListBuffer<Type> supertypes = new ListBuffer<>();
3364 for (Type i : ict.interfaces_field) {
3365 if (i.isParameterized()) {
3366 targs.appendList(i.tsym.type.allparams());
3367 }
3368 supertypes.append(i.tsym.type);
3369 }
3370 IntersectionClassType notionalIntf = types.makeIntersectionType(supertypes.toList());
3371 notionalIntf.allparams_field = targs.toList();
3372 notionalIntf.tsym.flags_field |= INTERFACE;
3373 return notionalIntf.tsym;
3374 }
3375 };
3376
3377 private Type fallbackDescriptorType(JCExpression tree) {
3378 switch (tree.getTag()) {
3379 case LAMBDA:
3380 JCLambda lambda = (JCLambda)tree;
3381 List<Type> argtypes = List.nil();
3382 for (JCVariableDecl param : lambda.params) {
3383 argtypes = param.vartype != null && param.vartype.type != null ?
3384 argtypes.append(param.vartype.type) :
3385 argtypes.append(syms.errType);
3386 }
3387 return new MethodType(argtypes, Type.recoveryType,
3388 List.of(syms.throwableType), syms.methodClass);
3389 case REFERENCE:
3390 return new MethodType(List.nil(), Type.recoveryType,
3391 List.of(syms.throwableType), syms.methodClass);
3392 default:
3393 Assert.error("Cannot get here!");
3394 }
3395 return null;
3396 }
3397
3398 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
3399 final InferenceContext inferenceContext, final Type... ts) {
3400 checkAccessibleTypes(pos, env, inferenceContext, List.from(ts));
3401 }
3402
3403 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
3404 final InferenceContext inferenceContext, final List<Type> ts) {
3405 if (inferenceContext.free(ts)) {
3406 inferenceContext.addFreeTypeListener(ts,
3407 solvedContext -> checkAccessibleTypes(pos, env, solvedContext, solvedContext.asInstTypes(ts)));
3408 } else {
3409 for (Type t : ts) {
3410 rs.checkAccessibleType(env, t);
3411 }
3412 }
3413 }
3414
3415 /**
3416 * Lambda/method reference have a special check context that ensures
3417 * that i.e. a lambda return type is compatible with the expected
3418 * type according to both the inherited context and the assignment
3419 * context.
3420 */
3421 class FunctionalReturnContext extends Check.NestedCheckContext {
3422
3423 FunctionalReturnContext(CheckContext enclosingContext) {
3424 super(enclosingContext);
3425 }
3426
3427 @Override
3428 public boolean compatible(Type found, Type req, Warner warn) {
3429 //return type must be compatible in both current context and assignment context
3430 return chk.basicHandler.compatible(inferenceContext().asUndetVar(found), inferenceContext().asUndetVar(req), warn);
3431 }
3432
3433 @Override
3434 public void report(DiagnosticPosition pos, JCDiagnostic details) {
3435 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleRetTypeInLambda(details)));
3436 }
3437 }
3438
3439 class ExpressionLambdaReturnContext extends FunctionalReturnContext {
3440
3441 JCExpression expr;
3442 boolean expStmtExpected;
3443
3444 ExpressionLambdaReturnContext(JCExpression expr, CheckContext enclosingContext) {
3445 super(enclosingContext);
3446 this.expr = expr;
3447 }
3448
3449 @Override
3450 public void report(DiagnosticPosition pos, JCDiagnostic details) {
3451 if (expStmtExpected) {
3452 enclosingContext.report(pos, diags.fragment(Fragments.StatExprExpected));
3453 } else {
3454 super.report(pos, details);
3455 }
3456 }
3457
3458 @Override
3459 public boolean compatible(Type found, Type req, Warner warn) {
3460 //a void return is compatible with an expression statement lambda
3461 if (req.hasTag(VOID)) {
3462 expStmtExpected = true;
3463 return TreeInfo.isExpressionStatement(expr);
3464 } else {
3465 return super.compatible(found, req, warn);
3466 }
3467 }
3468 }
3469
3470 ResultInfo lambdaBodyResult(JCLambda that, Type descriptor, ResultInfo resultInfo) {
3471 FunctionalReturnContext funcContext = that.getBodyKind() == JCLambda.BodyKind.EXPRESSION ?
3472 new ExpressionLambdaReturnContext((JCExpression)that.getBody(), resultInfo.checkContext) :
3473 new FunctionalReturnContext(resultInfo.checkContext);
3474
3475 return descriptor.getReturnType() == Type.recoveryType ?
3476 recoveryInfo :
3477 new ResultInfo(KindSelector.VAL,
3478 descriptor.getReturnType(), funcContext);
3479 }
3480
3481 /**
3482 * Lambda compatibility. Check that given return types, thrown types, parameter types
3483 * are compatible with the expected functional interface descriptor. This means that:
3484 * (i) parameter types must be identical to those of the target descriptor; (ii) return
3485 * types must be compatible with the return type of the expected descriptor.
3486 */
3487 void checkLambdaCompatible(JCLambda tree, Type descriptor, CheckContext checkContext) {
3488 Type returnType = checkContext.inferenceContext().asUndetVar(descriptor.getReturnType());
3489
3490 //return values have already been checked - but if lambda has no return
3491 //values, we must ensure that void/value compatibility is correct;
3492 //this amounts at checking that, if a lambda body can complete normally,
3493 //the descriptor's return type must be void
3494 if (tree.getBodyKind() == JCLambda.BodyKind.STATEMENT && tree.canCompleteNormally &&
3495 !returnType.hasTag(VOID) && returnType != Type.recoveryType) {
3496 Fragment msg =
3497 Fragments.IncompatibleRetTypeInLambda(Fragments.MissingRetVal(returnType));
3498 checkContext.report(tree,
3499 diags.fragment(msg));
3500 }
3501
3502 List<Type> argTypes = checkContext.inferenceContext().asUndetVars(descriptor.getParameterTypes());
3503 if (!types.isSameTypes(argTypes, TreeInfo.types(tree.params))) {
3504 checkContext.report(tree, diags.fragment(Fragments.IncompatibleArgTypesInLambda));
3505 }
3506 }
3507
3508 /* Map to hold 'fake' clinit methods. If a lambda is used to initialize a
3509 * static field and that lambda has type annotations, these annotations will
3510 * also be stored at these fake clinit methods.
3511 *
3512 * LambdaToMethod also use fake clinit methods so they can be reused.
3513 * Also as LTM is a phase subsequent to attribution, the methods from
3514 * clinits can be safely removed by LTM to save memory.
3515 */
3516 private Map<ClassSymbol, MethodSymbol> clinits = new HashMap<>();
3517
3518 public MethodSymbol removeClinit(ClassSymbol sym) {
3519 return clinits.remove(sym);
3520 }
3521
3522 /* This method returns an environment to be used to attribute a lambda
3523 * expression.
3524 *
3525 * The owner of this environment is a method symbol. If the current owner
3526 * is not a method, for example if the lambda is used to initialize
3527 * a field, then if the field is:
3528 *
3529 * - an instance field, we use the first constructor.
3530 * - a static field, we create a fake clinit method.
3531 */
3532 public Env<AttrContext> lambdaEnv(JCLambda that, Env<AttrContext> env) {
3533 Env<AttrContext> lambdaEnv;
3534 Symbol owner = env.info.scope.owner;
3535 if (owner.kind == VAR && owner.owner.kind == TYP) {
3536 //field initializer
3537 ClassSymbol enclClass = owner.enclClass();
3538 Symbol newScopeOwner = env.info.scope.owner;
3539 /* if the field isn't static, then we can get the first constructor
3540 * and use it as the owner of the environment. This is what
3541 * LTM code is doing to look for type annotations so we are fine.
3542 */
3543 if ((owner.flags() & STATIC) == 0) {
3544 for (Symbol s : enclClass.members_field.getSymbolsByName(names.init)) {
3545 newScopeOwner = s;
3546 break;
3547 }
3548 } else {
3549 /* if the field is static then we need to create a fake clinit
3550 * method, this method can later be reused by LTM.
3551 */
3552 MethodSymbol clinit = clinits.get(enclClass);
3553 if (clinit == null) {
3554 Type clinitType = new MethodType(List.nil(),
3555 syms.voidType, List.nil(), syms.methodClass);
3556 clinit = new MethodSymbol(STATIC | SYNTHETIC | PRIVATE,
3557 names.clinit, clinitType, enclClass);
3558 clinit.params = List.nil();
3559 clinits.put(enclClass, clinit);
3560 }
3561 newScopeOwner = clinit;
3562 }
3563 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dupUnshared(newScopeOwner)));
3564 } else {
3565 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dup()));
3566 }
3567 lambdaEnv.info.yieldResult = null;
3568 lambdaEnv.info.isLambda = true;
3569 return lambdaEnv;
3570 }
3571
3572 @Override
3573 public void visitReference(final JCMemberReference that) {
3574 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
3575 if (pt().hasTag(NONE) && (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3576 //method reference only allowed in assignment or method invocation/cast context
3577 log.error(that.pos(), Errors.UnexpectedMref);
3578 }
3579 result = that.type = types.createErrorType(pt());
3580 return;
3581 }
3582 final Env<AttrContext> localEnv = env.dup(that);
3583 try {
3584 //attribute member reference qualifier - if this is a constructor
3585 //reference, the expected kind must be a type
3586 Type exprType = attribTree(that.expr, env, memberReferenceQualifierResult(that));
3587
3588 if (that.getMode() == JCMemberReference.ReferenceMode.NEW) {
3589 exprType = chk.checkConstructorRefType(that.expr, exprType);
3590 if (!exprType.isErroneous() &&
3591 exprType.isRaw() &&
3592 that.typeargs != null) {
3593 log.error(that.expr.pos(),
3594 Errors.InvalidMref(Kinds.kindName(that.getMode()),
3595 Fragments.MrefInferAndExplicitParams));
3596 exprType = types.createErrorType(exprType);
3597 }
3598 }
3599
3600 if (exprType.isErroneous()) {
3601 //if the qualifier expression contains problems,
3602 //give up attribution of method reference
3603 result = that.type = exprType;
3604 return;
3605 }
3606
3607 if (TreeInfo.isStaticSelector(that.expr, names)) {
3608 //if the qualifier is a type, validate it; raw warning check is
3609 //omitted as we don't know at this stage as to whether this is a
3610 //raw selector (because of inference)
3611 chk.validate(that.expr, env, false);
3612 } else {
3613 Symbol lhsSym = TreeInfo.symbol(that.expr);
3614 localEnv.info.selectSuper = lhsSym != null && lhsSym.name == names._super;
3615 }
3616 //attrib type-arguments
3617 List<Type> typeargtypes = List.nil();
3618 if (that.typeargs != null) {
3619 typeargtypes = attribTypes(that.typeargs, localEnv);
3620 }
3621
3622 boolean isTargetSerializable =
3623 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3624 rs.isSerializable(pt());
3625 TargetInfo targetInfo = getTargetInfo(that, resultInfo, null);
3626 Type currentTarget = targetInfo.target;
3627 Type desc = targetInfo.descriptor;
3628
3629 setFunctionalInfo(localEnv, that, pt(), desc, currentTarget, resultInfo.checkContext);
3630 List<Type> argtypes = desc.getParameterTypes();
3631 Resolve.MethodCheck referenceCheck = rs.resolveMethodCheck;
3632
3633 if (resultInfo.checkContext.inferenceContext().free(argtypes)) {
3634 referenceCheck = rs.new MethodReferenceCheck(resultInfo.checkContext.inferenceContext());
3635 }
3636
3637 Pair<Symbol, Resolve.ReferenceLookupHelper> refResult = null;
3638 List<Type> saved_undet = resultInfo.checkContext.inferenceContext().save();
3639 try {
3640 refResult = rs.resolveMemberReference(localEnv, that, that.expr.type,
3641 that.name, argtypes, typeargtypes, targetInfo.descriptor, referenceCheck,
3642 resultInfo.checkContext.inferenceContext(), rs.basicReferenceChooser);
3643 } finally {
3644 resultInfo.checkContext.inferenceContext().rollback(saved_undet);
3645 }
3646
3647 Symbol refSym = refResult.fst;
3648 Resolve.ReferenceLookupHelper lookupHelper = refResult.snd;
3649
3650 /** this switch will need to go away and be replaced by the new RESOLUTION_TARGET testing
3651 * JDK-8075541
3652 */
3653 if (refSym.kind != MTH) {
3654 boolean targetError;
3655 switch (refSym.kind) {
3656 case ABSENT_MTH:
3657 case MISSING_ENCL:
3658 targetError = false;
3659 break;
3660 case WRONG_MTH:
3661 case WRONG_MTHS:
3662 case AMBIGUOUS:
3663 case HIDDEN:
3664 case STATICERR:
3665 targetError = true;
3666 break;
3667 default:
3668 Assert.error("unexpected result kind " + refSym.kind);
3669 targetError = false;
3670 }
3671
3672 JCDiagnostic detailsDiag = ((Resolve.ResolveError)refSym.baseSymbol())
3673 .getDiagnostic(JCDiagnostic.DiagnosticType.FRAGMENT,
3674 that, exprType.tsym, exprType, that.name, argtypes, typeargtypes);
3675
3676 JCDiagnostic diag = diags.create(log.currentSource(), that,
3677 targetError ?
3678 Fragments.InvalidMref(Kinds.kindName(that.getMode()), detailsDiag) :
3679 Errors.InvalidMref(Kinds.kindName(that.getMode()), detailsDiag));
3680
3681 if (targetError && currentTarget == Type.recoveryType) {
3682 //a target error doesn't make sense during recovery stage
3683 //as we don't know what actual parameter types are
3684 result = that.type = currentTarget;
3685 return;
3686 } else {
3687 if (targetError) {
3688 resultInfo.checkContext.report(that, diag);
3689 } else {
3690 log.report(diag);
3691 }
3692 result = that.type = types.createErrorType(currentTarget);
3693 return;
3694 }
3695 }
3696
3697 that.sym = refSym.isConstructor() ? refSym.baseSymbol() : refSym;
3698 that.kind = lookupHelper.referenceKind(that.sym);
3699 that.ownerAccessible = rs.isAccessible(localEnv, that.sym.enclClass());
3700
3701 if (desc.getReturnType() == Type.recoveryType) {
3702 // stop here
3703 result = that.type = currentTarget;
3704 return;
3705 }
3706
3707 if (!env.info.attributionMode.isSpeculative && that.getMode() == JCMemberReference.ReferenceMode.NEW) {
3708 Type enclosingType = exprType.getEnclosingType();
3709 if (enclosingType != null && enclosingType.hasTag(CLASS)) {
3710 // Check for the existence of an appropriate outer instance
3711 rs.resolveImplicitThis(that.pos(), env, exprType);
3712 }
3713 }
3714
3715 if (resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
3716
3717 if (that.getMode() == ReferenceMode.INVOKE &&
3718 TreeInfo.isStaticSelector(that.expr, names) &&
3719 that.kind.isUnbound() &&
3720 lookupHelper.site.isRaw()) {
3721 chk.checkRaw(that.expr, localEnv);
3722 }
3723
3724 if (that.sym.isStatic() && TreeInfo.isStaticSelector(that.expr, names) &&
3725 exprType.getTypeArguments().nonEmpty()) {
3726 //static ref with class type-args
3727 log.error(that.expr.pos(),
3728 Errors.InvalidMref(Kinds.kindName(that.getMode()),
3729 Fragments.StaticMrefWithTargs));
3730 result = that.type = types.createErrorType(currentTarget);
3731 return;
3732 }
3733
3734 if (!refSym.isStatic() && that.kind == JCMemberReference.ReferenceKind.SUPER) {
3735 // Check that super-qualified symbols are not abstract (JLS)
3736 rs.checkNonAbstract(that.pos(), that.sym);
3737 }
3738
3739 if (isTargetSerializable) {
3740 chk.checkAccessFromSerializableElement(that, true);
3741 }
3742 }
3743
3744 ResultInfo checkInfo =
3745 resultInfo.dup(newMethodTemplate(
3746 desc.getReturnType().hasTag(VOID) ? Type.noType : desc.getReturnType(),
3747 that.kind.isUnbound() ? argtypes.tail : argtypes, typeargtypes),
3748 new FunctionalReturnContext(resultInfo.checkContext), CheckMode.NO_TREE_UPDATE);
3749
3750 Type refType = checkId(that, lookupHelper.site, refSym, localEnv, checkInfo);
3751
3752 if (that.kind.isUnbound() &&
3753 resultInfo.checkContext.inferenceContext().free(argtypes.head)) {
3754 //re-generate inference constraints for unbound receiver
3755 if (!types.isSubtype(resultInfo.checkContext.inferenceContext().asUndetVar(argtypes.head), exprType)) {
3756 //cannot happen as this has already been checked - we just need
3757 //to regenerate the inference constraints, as that has been lost
3758 //as a result of the call to inferenceContext.save()
3759 Assert.error("Can't get here");
3760 }
3761 }
3762
3763 if (!refType.isErroneous()) {
3764 refType = types.createMethodTypeWithReturn(refType,
3765 adjustMethodReturnType(refSym, lookupHelper.site, that.name, checkInfo.pt.getParameterTypes(), refType.getReturnType()));
3766 }
3767
3768 //go ahead with standard method reference compatibility check - note that param check
3769 //is a no-op (as this has been taken care during method applicability)
3770 boolean isSpeculativeRound =
3771 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
3772
3773 that.type = currentTarget; //avoids recovery at this stage
3774 checkReferenceCompatible(that, desc, refType, resultInfo.checkContext, isSpeculativeRound);
3775 if (!isSpeculativeRound) {
3776 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), desc, currentTarget);
3777 }
3778 result = check(that, currentTarget, KindSelector.VAL, resultInfo);
3779 } catch (Types.FunctionDescriptorLookupError ex) {
3780 JCDiagnostic cause = ex.getDiagnostic();
3781 resultInfo.checkContext.report(that, cause);
3782 result = that.type = types.createErrorType(pt());
3783 return;
3784 }
3785 }
3786 //where
3787 ResultInfo memberReferenceQualifierResult(JCMemberReference tree) {
3788 //if this is a constructor reference, the expected kind must be a type
3789 return new ResultInfo(tree.getMode() == ReferenceMode.INVOKE ?
3790 KindSelector.VAL_TYP : KindSelector.TYP,
3791 Type.noType);
3792 }
3793
3794
3795 @SuppressWarnings("fallthrough")
3796 void checkReferenceCompatible(JCMemberReference tree, Type descriptor, Type refType, CheckContext checkContext, boolean speculativeAttr) {
3797 InferenceContext inferenceContext = checkContext.inferenceContext();
3798 Type returnType = inferenceContext.asUndetVar(descriptor.getReturnType());
3799
3800 Type resType;
3801 switch (tree.getMode()) {
3802 case NEW:
3803 if (!tree.expr.type.isRaw()) {
3804 resType = tree.expr.type;
3805 break;
3806 }
3807 default:
3808 resType = refType.getReturnType();
3809 }
3810
3811 Type incompatibleReturnType = resType;
3812
3813 if (returnType.hasTag(VOID)) {
3814 incompatibleReturnType = null;
3815 }
3816
3817 if (!returnType.hasTag(VOID) && !resType.hasTag(VOID)) {
3818 if (resType.isErroneous() ||
3819 new FunctionalReturnContext(checkContext).compatible(resType, returnType,
3820 checkContext.checkWarner(tree, resType, returnType))) {
3821 incompatibleReturnType = null;
3822 }
3823 }
3824
3825 if (incompatibleReturnType != null) {
3826 Fragment msg =
3827 Fragments.IncompatibleRetTypeInMref(Fragments.InconvertibleTypes(resType, descriptor.getReturnType()));
3828 checkContext.report(tree, diags.fragment(msg));
3829 } else {
3830 if (inferenceContext.free(refType)) {
3831 // we need to wait for inference to finish and then replace inference vars in the referent type
3832 inferenceContext.addFreeTypeListener(List.of(refType),
3833 instantiatedContext -> {
3834 tree.referentType = instantiatedContext.asInstType(refType);
3835 });
3836 } else {
3837 tree.referentType = refType;
3838 }
3839 }
3840
3841 if (!speculativeAttr) {
3842 if (!checkExConstraints(refType.getThrownTypes(), descriptor.getThrownTypes(), inferenceContext)) {
3843 log.error(tree, Errors.IncompatibleThrownTypesInMref(refType.getThrownTypes()));
3844 }
3845 }
3846 }
3847
3848 boolean checkExConstraints(
3849 List<Type> thrownByFuncExpr,
3850 List<Type> thrownAtFuncType,
3851 InferenceContext inferenceContext) {
3852 /** 18.2.5: Otherwise, let E1, ..., En be the types in the function type's throws clause that
3853 * are not proper types
3854 */
3855 List<Type> nonProperList = thrownAtFuncType.stream()
3856 .filter(e -> inferenceContext.free(e)).collect(List.collector());
3857 List<Type> properList = thrownAtFuncType.diff(nonProperList);
3858
3859 /** Let X1,...,Xm be the checked exception types that the lambda body can throw or
3860 * in the throws clause of the invocation type of the method reference's compile-time
3861 * declaration
3862 */
3863 List<Type> checkedList = thrownByFuncExpr.stream()
3864 .filter(e -> chk.isChecked(e)).collect(List.collector());
3865
3866 /** If n = 0 (the function type's throws clause consists only of proper types), then
3867 * if there exists some i (1 <= i <= m) such that Xi is not a subtype of any proper type
3868 * in the throws clause, the constraint reduces to false; otherwise, the constraint
3869 * reduces to true
3870 */
3871 ListBuffer<Type> uncaughtByProperTypes = new ListBuffer<>();
3872 for (Type checked : checkedList) {
3873 boolean isSubtype = false;
3874 for (Type proper : properList) {
3875 if (types.isSubtype(checked, proper)) {
3876 isSubtype = true;
3877 break;
3878 }
3879 }
3880 if (!isSubtype) {
3881 uncaughtByProperTypes.add(checked);
3882 }
3883 }
3884
3885 if (nonProperList.isEmpty() && !uncaughtByProperTypes.isEmpty()) {
3886 return false;
3887 }
3888
3889 /** If n > 0, the constraint reduces to a set of subtyping constraints:
3890 * for all i (1 <= i <= m), if Xi is not a subtype of any proper type in the
3891 * throws clause, then the constraints include, for all j (1 <= j <= n), <Xi <: Ej>
3892 */
3893 List<Type> nonProperAsUndet = inferenceContext.asUndetVars(nonProperList);
3894 uncaughtByProperTypes.forEach(checkedEx -> {
3895 nonProperAsUndet.forEach(nonProper -> {
3896 types.isSubtype(checkedEx, nonProper);
3897 });
3898 });
3899
3900 /** In addition, for all j (1 <= j <= n), the constraint reduces to the bound throws Ej
3901 */
3902 nonProperAsUndet.stream()
3903 .filter(t -> t.hasTag(UNDETVAR))
3904 .forEach(t -> ((UndetVar)t).setThrow());
3905 return true;
3906 }
3907
3908 /**
3909 * Set functional type info on the underlying AST. Note: as the target descriptor
3910 * might contain inference variables, we might need to register an hook in the
3911 * current inference context.
3912 */
3913 private void setFunctionalInfo(final Env<AttrContext> env, final JCFunctionalExpression fExpr,
3914 final Type pt, final Type descriptorType, final Type primaryTarget, final CheckContext checkContext) {
3915 if (checkContext.inferenceContext().free(descriptorType)) {
3916 checkContext.inferenceContext().addFreeTypeListener(List.of(pt, descriptorType),
3917 inferenceContext -> setFunctionalInfo(env, fExpr, pt, inferenceContext.asInstType(descriptorType),
3918 inferenceContext.asInstType(primaryTarget), checkContext));
3919 } else {
3920 if (pt.hasTag(CLASS)) {
3921 fExpr.target = primaryTarget;
3922 }
3923 if (checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3924 pt != Type.recoveryType) {
3925 //check that functional interface class is well-formed
3926 try {
3927 /* Types.makeFunctionalInterfaceClass() may throw an exception
3928 * when it's executed post-inference. See the listener code
3929 * above.
3930 */
3931 ClassSymbol csym = types.makeFunctionalInterfaceClass(env,
3932 names.empty, fExpr.target, ABSTRACT);
3933 if (csym != null) {
3934 chk.checkImplementations(env.tree, csym, csym);
3935 try {
3936 //perform an additional functional interface check on the synthetic class,
3937 //as there may be spurious errors for raw targets - because of existing issues
3938 //with membership and inheritance (see JDK-8074570).
3939 csym.flags_field |= INTERFACE;
3940 types.findDescriptorType(csym.type);
3941 } catch (FunctionDescriptorLookupError err) {
3942 resultInfo.checkContext.report(fExpr,
3943 diags.fragment(Fragments.NoSuitableFunctionalIntfInst(fExpr.target)));
3944 }
3945 }
3946 } catch (Types.FunctionDescriptorLookupError ex) {
3947 JCDiagnostic cause = ex.getDiagnostic();
3948 resultInfo.checkContext.report(env.tree, cause);
3949 }
3950 }
3951 }
3952 }
3953
3954 public void visitParens(JCParens tree) {
3955 Type owntype = attribTree(tree.expr, env, resultInfo);
3956 result = check(tree, owntype, pkind(), resultInfo);
3957 Symbol sym = TreeInfo.symbol(tree);
3958 if (sym != null && sym.kind.matches(KindSelector.TYP_PCK) && sym.kind != Kind.ERR)
3959 log.error(tree.pos(), Errors.IllegalParenthesizedExpression);
3960 }
3961
3962 public void visitAssign(JCAssign tree) {
3963 Type owntype = attribTree(tree.lhs, env.dup(tree), varAssignmentInfo);
3964 Type capturedType = capture(owntype);
3965 attribExpr(tree.rhs, env, owntype);
3966 result = check(tree, capturedType, KindSelector.VAL, resultInfo);
3967 }
3968
3969 public void visitAssignop(JCAssignOp tree) {
3970 // Attribute arguments.
3971 Type owntype = attribTree(tree.lhs, env, varAssignmentInfo);
3972 Type operand = attribExpr(tree.rhs, env);
3973 // Find operator.
3974 Symbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag().noAssignOp(), owntype, operand);
3975 if (operator != operators.noOpSymbol &&
3976 !owntype.isErroneous() &&
3977 !operand.isErroneous()) {
3978 chk.checkDivZero(tree.rhs.pos(), operator, operand);
3979 chk.checkCastable(tree.rhs.pos(),
3980 operator.type.getReturnType(),
3981 owntype);
3982 chk.checkLossOfPrecision(tree.rhs.pos(), operand, owntype);
3983 }
3984 result = check(tree, owntype, KindSelector.VAL, resultInfo);
3985 }
3986
3987 public void visitUnary(JCUnary tree) {
3988 // Attribute arguments.
3989 Type argtype = (tree.getTag().isIncOrDecUnaryOp())
3990 ? attribTree(tree.arg, env, varAssignmentInfo)
3991 : chk.checkNonVoid(tree.arg.pos(), attribExpr(tree.arg, env));
3992
3993 // Find operator.
3994 OperatorSymbol operator = tree.operator = operators.resolveUnary(tree, tree.getTag(), argtype);
3995 Type owntype = types.createErrorType(tree.type);
3996 if (operator != operators.noOpSymbol &&
3997 !argtype.isErroneous()) {
3998 owntype = (tree.getTag().isIncOrDecUnaryOp())
3999 ? tree.arg.type
4000 : operator.type.getReturnType();
4001 int opc = operator.opcode;
4002
4003 // If the argument is constant, fold it.
4004 if (argtype.constValue() != null) {
4005 Type ctype = cfolder.fold1(opc, argtype);
4006 if (ctype != null) {
4007 owntype = cfolder.coerce(ctype, owntype);
4008 }
4009 }
4010 }
4011 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4012 matchBindings = matchBindingsComputer.unary(tree, matchBindings);
4013 }
4014
4015 public void visitBinary(JCBinary tree) {
4016 // Attribute arguments.
4017 Type left = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.lhs, env));
4018 // x && y
4019 // include x's bindings when true in y
4020
4021 // x || y
4022 // include x's bindings when false in y
4023
4024 MatchBindings lhsBindings = matchBindings;
4025 List<BindingSymbol> propagatedBindings;
4026 switch (tree.getTag()) {
4027 case AND:
4028 propagatedBindings = lhsBindings.bindingsWhenTrue;
4029 break;
4030 case OR:
4031 propagatedBindings = lhsBindings.bindingsWhenFalse;
4032 break;
4033 default:
4034 propagatedBindings = List.nil();
4035 break;
4036 }
4037 Env<AttrContext> rhsEnv = bindingEnv(env, propagatedBindings);
4038 Type right;
4039 try {
4040 right = chk.checkNonVoid(tree.rhs.pos(), attribExpr(tree.rhs, rhsEnv));
4041 } finally {
4042 rhsEnv.info.scope.leave();
4043 }
4044
4045 matchBindings = matchBindingsComputer.binary(tree, lhsBindings, matchBindings);
4046
4047 // Find operator.
4048 OperatorSymbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag(), left, right);
4049 Type owntype = types.createErrorType(tree.type);
4050 if (operator != operators.noOpSymbol &&
4051 !left.isErroneous() &&
4052 !right.isErroneous()) {
4053 owntype = operator.type.getReturnType();
4054 int opc = operator.opcode;
4055 // If both arguments are constants, fold them.
4056 if (left.constValue() != null && right.constValue() != null) {
4057 Type ctype = cfolder.fold2(opc, left, right);
4058 if (ctype != null) {
4059 owntype = cfolder.coerce(ctype, owntype);
4060 }
4061 }
4062
4063 // Check that argument types of a reference ==, != are
4064 // castable to each other, (JLS 15.21). Note: unboxing
4065 // comparisons will not have an acmp* opc at this point.
4066 if ((opc == ByteCodes.if_acmpeq || opc == ByteCodes.if_acmpne)) {
4067 if (!types.isCastable(left, right, new Warner(tree.pos()))) {
4068 log.error(tree.pos(), Errors.IncomparableTypes(left, right));
4069 }
4070 chk.checkForSuspectClassLiteralComparison(tree, left, right);
4071 }
4072
4073 chk.checkDivZero(tree.rhs.pos(), operator, right);
4074 }
4075 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4076 }
4077
4078 public void visitTypeCast(final JCTypeCast tree) {
4079 Type clazztype = attribType(tree.clazz, env);
4080 chk.validate(tree.clazz, env, false);
4081 //a fresh environment is required for 292 inference to work properly ---
4082 //see Infer.instantiatePolymorphicSignatureInstance()
4083 Env<AttrContext> localEnv = env.dup(tree);
4084 //should we propagate the target type?
4085 final ResultInfo castInfo;
4086 JCExpression expr = TreeInfo.skipParens(tree.expr);
4087 boolean isPoly = (expr.hasTag(LAMBDA) || expr.hasTag(REFERENCE));
4088 if (isPoly) {
4089 //expression is a poly - we need to propagate target type info
4090 castInfo = new ResultInfo(KindSelector.VAL, clazztype,
4091 new Check.NestedCheckContext(resultInfo.checkContext) {
4092 @Override
4093 public boolean compatible(Type found, Type req, Warner warn) {
4094 return types.isCastable(found, req, warn);
4095 }
4096 });
4097 } else {
4098 //standalone cast - target-type info is not propagated
4099 castInfo = unknownExprInfo;
4100 }
4101 Type exprtype = attribTree(tree.expr, localEnv, castInfo);
4102 Type owntype = isPoly ? clazztype : chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
4103 if (exprtype.constValue() != null)
4104 owntype = cfolder.coerce(exprtype, owntype);
4105 result = check(tree, capture(owntype), KindSelector.VAL, resultInfo);
4106 if (!isPoly)
4107 chk.checkRedundantCast(localEnv, tree);
4108 }
4109
4110 public void visitTypeTest(JCInstanceOf tree) {
4111 Type exprtype = chk.checkNullOrRefType(
4112 tree.expr.pos(), attribExpr(tree.expr, env));
4113 Type clazztype;
4114 JCTree typeTree;
4115 if (tree.pattern.getTag() == BINDINGPATTERN ||
4116 tree.pattern.getTag() == PARENTHESIZEDPATTERN ||
4117 tree.pattern.getTag() == RECORDPATTERN) {
4118 attribTree(tree.pattern, env, unknownExprInfo);
4119 clazztype = tree.pattern.type;
4120 if (types.isSubtype(exprtype, clazztype) &&
4121 !exprtype.isErroneous() && !clazztype.isErroneous() &&
4122 tree.pattern.getTag() != RECORDPATTERN) {
4123 if (!allowUnconditionalPatternsInstanceOf) {
4124 log.error(tree.pos(), Errors.InstanceofPatternNoSubtype(exprtype, clazztype));
4125 } else if (preview.isPreview(Feature.UNCONDITIONAL_PATTERN_IN_INSTANCEOF)) {
4126 preview.warnPreview(tree.pattern.pos(), Feature.UNCONDITIONAL_PATTERN_IN_INSTANCEOF);
4127 }
4128 }
4129 typeTree = TreeInfo.primaryPatternTypeTree((JCPattern) tree.pattern);
4130 } else {
4131 clazztype = attribType(tree.pattern, env);
4132 typeTree = tree.pattern;
4133 chk.validate(typeTree, env, false);
4134 }
4135 if (!clazztype.hasTag(TYPEVAR)) {
4136 clazztype = chk.checkClassOrArrayType(typeTree.pos(), clazztype);
4137 }
4138 if (!clazztype.isErroneous() && !types.isReifiable(clazztype)) {
4139 boolean valid = false;
4140 if (allowReifiableTypesInInstanceof) {
4141 valid = checkCastablePattern(tree.expr.pos(), exprtype, clazztype);
4142 } else {
4143 log.error(DiagnosticFlag.SOURCE_LEVEL, tree.pos(),
4144 Feature.REIFIABLE_TYPES_INSTANCEOF.error(this.sourceName));
4145 allowReifiableTypesInInstanceof = true;
4146 }
4147 if (!valid) {
4148 clazztype = types.createErrorType(clazztype);
4149 }
4150 }
4151 chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
4152 result = check(tree, syms.booleanType, KindSelector.VAL, resultInfo);
4153 }
4154
4155 private boolean checkCastablePattern(DiagnosticPosition pos,
4156 Type exprType,
4157 Type pattType) {
4158 Warner warner = new Warner();
4159 if (!types.isCastable(exprType, pattType, warner)) {
4160 chk.basicHandler.report(pos,
4161 diags.fragment(Fragments.InconvertibleTypes(exprType, pattType)));
4162 return false;
4163 } else if ((exprType.isPrimitive() || pattType.isPrimitive()) &&
4164 (!exprType.isPrimitive() ||
4165 !pattType.isPrimitive() ||
4166 !types.isSameType(exprType, pattType))) {
4167 chk.basicHandler.report(pos,
4168 diags.fragment(Fragments.NotApplicableTypes(exprType, pattType)));
4169 return false;
4170 } else if (warner.hasLint(LintCategory.UNCHECKED)) {
4171 log.error(pos,
4172 Errors.InstanceofReifiableNotSafe(exprType, pattType));
4173 return false;
4174 } else {
4175 return true;
4176 }
4177 }
4178
4179 public void visitBindingPattern(JCBindingPattern tree) {
4180 Type type;
4181 if (tree.var.vartype != null) {
4182 ResultInfo varInfo = new ResultInfo(KindSelector.TYP, resultInfo.pt, resultInfo.checkContext);
4183 type = attribTree(tree.var.vartype, env, varInfo);
4184 } else {
4185 type = resultInfo.pt;
4186 }
4187 tree.type = tree.var.type = type;
4188 BindingSymbol v = new BindingSymbol(tree.var.mods.flags, tree.var.name, type, env.info.scope.owner);
4189 v.pos = tree.pos;
4190 tree.var.sym = v;
4191 if (chk.checkUnique(tree.var.pos(), v, env.info.scope)) {
4192 chk.checkTransparentVar(tree.var.pos(), v, env.info.scope);
4193 }
4194 if (tree.var.vartype != null) {
4195 annotate.annotateLater(tree.var.mods.annotations, env, v, tree.pos());
4196 annotate.queueScanTreeAndTypeAnnotate(tree.var.vartype, env, v, tree.var.pos());
4197 annotate.flush();
4198 }
4199 chk.validate(tree.var.vartype, env, true);
4200 result = tree.type;
4201 matchBindings = new MatchBindings(List.of(v), List.nil());
4202 }
4203
4204 @Override
4205 public void visitRecordPattern(JCRecordPattern tree) {
4206 tree.type = attribType(tree.deconstructor, env);
4207 Type site = types.removeWildcards(tree.type);
4208 List<Type> expectedRecordTypes;
4209 if (site.tsym.kind == Kind.TYP && ((ClassSymbol) site.tsym).isRecord()) {
4210 ClassSymbol record = (ClassSymbol) site.tsym;
4211 if (record.type.getTypeArguments().nonEmpty() && tree.type.isRaw()) {
4212 log.error(tree.pos(),Errors.RawDeconstructionPattern);
4213 }
4214 expectedRecordTypes = record.getRecordComponents()
4215 .stream()
4216 .map(rc -> types.memberType(site, rc)).collect(List.collector());
4217 tree.record = record;
4218 } else {
4219 log.error(tree.pos(), Errors.DeconstructionPatternOnlyRecords(site.tsym));
4220 expectedRecordTypes = Stream.generate(() -> Type.noType)
4221 .limit(tree.nested.size())
4222 .collect(List.collector());
4223 }
4224 ListBuffer<BindingSymbol> outBindings = new ListBuffer<>();
4225 List<Type> recordTypes = expectedRecordTypes;
4226 List<JCPattern> nestedPatterns = tree.nested;
4227 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
4228 try {
4229 while (recordTypes.nonEmpty() && nestedPatterns.nonEmpty()) {
4230 boolean nestedIsVarPattern = false;
4231 nestedIsVarPattern |= nestedPatterns.head.hasTag(BINDINGPATTERN) &&
4232 ((JCBindingPattern) nestedPatterns.head).var.vartype == null;
4233 attribExpr(nestedPatterns.head, localEnv, nestedIsVarPattern ? recordTypes.head : Type.noType);
4234 checkCastablePattern(nestedPatterns.head.pos(), recordTypes.head, nestedPatterns.head.type);
4235 outBindings.addAll(matchBindings.bindingsWhenTrue);
4236 matchBindings.bindingsWhenTrue.forEach(localEnv.info.scope::enter);
4237 nestedPatterns = nestedPatterns.tail;
4238 recordTypes = recordTypes.tail;
4239 }
4240 if (recordTypes.nonEmpty() || nestedPatterns.nonEmpty()) {
4241 while (nestedPatterns.nonEmpty()) {
4242 attribExpr(nestedPatterns.head, localEnv, Type.noType);
4243 nestedPatterns = nestedPatterns.tail;
4244 }
4245 List<Type> nestedTypes =
4246 tree.nested.stream().map(p -> p.type).collect(List.collector());
4247 log.error(tree.pos(),
4248 Errors.IncorrectNumberOfNestedPatterns(expectedRecordTypes,
4249 nestedTypes));
4250 }
4251 if (tree.var != null) {
4252 BindingSymbol v = new BindingSymbol(tree.var.mods.flags, tree.var.name, tree.type,
4253 localEnv.info.scope.owner);
4254 v.pos = tree.pos;
4255 tree.var.sym = v;
4256 if (chk.checkUnique(tree.var.pos(), v, localEnv.info.scope)) {
4257 chk.checkTransparentVar(tree.var.pos(), v, localEnv.info.scope);
4258 }
4259 if (tree.var.vartype != null) {
4260 annotate.annotateLater(tree.var.mods.annotations, localEnv, v, tree.pos());
4261 annotate.queueScanTreeAndTypeAnnotate(tree.var.vartype, localEnv, v, tree.var.pos());
4262 annotate.flush();
4263 }
4264 outBindings.add(v);
4265 }
4266 } finally {
4267 localEnv.info.scope.leave();
4268 }
4269 chk.validate(tree.deconstructor, env, true);
4270 result = tree.type;
4271 matchBindings = new MatchBindings(outBindings.toList(), List.nil());
4272 }
4273
4274 public void visitParenthesizedPattern(JCParenthesizedPattern tree) {
4275 attribExpr(tree.pattern, env);
4276 result = tree.type = tree.pattern.type;
4277 }
4278
4279 public void visitIndexed(JCArrayAccess tree) {
4280 Type owntype = types.createErrorType(tree.type);
4281 Type atype = attribExpr(tree.indexed, env);
4282 attribExpr(tree.index, env, syms.intType);
4283 if (types.isArray(atype))
4284 owntype = types.elemtype(atype);
4285 else if (!atype.hasTag(ERROR))
4286 log.error(tree.pos(), Errors.ArrayReqButFound(atype));
4287 if (!pkind().contains(KindSelector.VAL))
4288 owntype = capture(owntype);
4289 result = check(tree, owntype, KindSelector.VAR, resultInfo);
4290 }
4291
4292 public void visitIdent(JCIdent tree) {
4293 Symbol sym;
4294
4295 // Find symbol
4296 if (pt().hasTag(METHOD) || pt().hasTag(FORALL)) {
4297 // If we are looking for a method, the prototype `pt' will be a
4298 // method type with the type of the call's arguments as parameters.
4299 env.info.pendingResolutionPhase = null;
4300 sym = rs.resolveMethod(tree.pos(), env, tree.name, pt().getParameterTypes(), pt().getTypeArguments());
4301 } else if (tree.sym != null && tree.sym.kind != VAR) {
4302 sym = tree.sym;
4303 } else {
4304 sym = rs.resolveIdent(tree.pos(), env, tree.name, pkind());
4305 }
4306 tree.sym = sym;
4307
4308 // Also find the environment current for the class where
4309 // sym is defined (`symEnv').
4310 Env<AttrContext> symEnv = env;
4311 if (env.enclClass.sym.owner.kind != PCK && // we are in an inner class
4312 sym.kind.matches(KindSelector.VAL_MTH) &&
4313 sym.owner.kind == TYP &&
4314 tree.name != names._this && tree.name != names._super) {
4315
4316 // Find environment in which identifier is defined.
4317 while (symEnv.outer != null &&
4318 !sym.isMemberOf(symEnv.enclClass.sym, types)) {
4319 symEnv = symEnv.outer;
4320 }
4321 }
4322
4323 // If symbol is a variable, ...
4324 if (sym.kind == VAR) {
4325 VarSymbol v = (VarSymbol)sym;
4326
4327 // ..., evaluate its initializer, if it has one, and check for
4328 // illegal forward reference.
4329 checkInit(tree, env, v, false);
4330
4331 // If we are expecting a variable (as opposed to a value), check
4332 // that the variable is assignable in the current environment.
4333 if (KindSelector.ASG.subset(pkind()))
4334 checkAssignable(tree.pos(), v, null, env);
4335 }
4336
4337 // In a constructor body,
4338 // if symbol is a field or instance method, check that it is
4339 // not accessed before the supertype constructor is called.
4340 if (symEnv.info.isSelfCall &&
4341 sym.kind.matches(KindSelector.VAL_MTH) &&
4342 sym.owner.kind == TYP &&
4343 (sym.flags() & STATIC) == 0) {
4344 chk.earlyRefError(tree.pos(), sym.kind == VAR ?
4345 sym : thisSym(tree.pos(), env));
4346 }
4347 Env<AttrContext> env1 = env;
4348 if (sym.kind != ERR && sym.kind != TYP &&
4349 sym.owner != null && sym.owner != env1.enclClass.sym) {
4350 // If the found symbol is inaccessible, then it is
4351 // accessed through an enclosing instance. Locate this
4352 // enclosing instance:
4353 while (env1.outer != null && !rs.isAccessible(env, env1.enclClass.sym.type, sym))
4354 env1 = env1.outer;
4355 }
4356
4357 if (env.info.isSerializable) {
4358 chk.checkAccessFromSerializableElement(tree, env.info.isSerializableLambda);
4359 }
4360
4361 result = checkId(tree, env1.enclClass.sym.type, sym, env, resultInfo);
4362 }
4363
4364 public void visitSelect(JCFieldAccess tree) {
4365 // Determine the expected kind of the qualifier expression.
4366 KindSelector skind = KindSelector.NIL;
4367 if (tree.name == names._this || tree.name == names._super ||
4368 tree.name == names._class)
4369 {
4370 skind = KindSelector.TYP;
4371 } else {
4372 if (pkind().contains(KindSelector.PCK))
4373 skind = KindSelector.of(skind, KindSelector.PCK);
4374 if (pkind().contains(KindSelector.TYP))
4375 skind = KindSelector.of(skind, KindSelector.TYP, KindSelector.PCK);
4376 if (pkind().contains(KindSelector.VAL_MTH))
4377 skind = KindSelector.of(skind, KindSelector.VAL, KindSelector.TYP);
4378 }
4379
4380 // Attribute the qualifier expression, and determine its symbol (if any).
4381 Type site = attribTree(tree.selected, env, new ResultInfo(skind, Type.noType));
4382 Assert.check(site == tree.selected.type);
4383 if (tree.name == names._class && site.isPrimitiveClass()) {
4384 /* JDK-8269956: Where a reflective (class) literal is needed, the unqualified Point.class is
4385 * always the "primary" mirror - representing the primitive reference runtime type - thereby
4386 * always matching the behavior of Object::getClass
4387 */
4388 if (!tree.selected.hasTag(SELECT) || ((JCFieldAccess) tree.selected).name != names.val) {
4389 tree.selected.setType(site = site.referenceProjection());
4390 }
4391 }
4392 if (!pkind().contains(KindSelector.TYP_PCK))
4393 site = capture(site); // Capture field access
4394
4395 // don't allow T.class T[].class, etc
4396 if (skind == KindSelector.TYP) {
4397 Type elt = site;
4398 while (elt.hasTag(ARRAY))
4399 elt = ((ArrayType)elt).elemtype;
4400 if (elt.hasTag(TYPEVAR)) {
4401 log.error(tree.pos(), Errors.TypeVarCantBeDeref);
4402 result = tree.type = types.createErrorType(tree.name, site.tsym, site);
4403 tree.sym = tree.type.tsym;
4404 return;
4405 }
4406 }
4407
4408 // If qualifier symbol is a type or `super', assert `selectSuper'
4409 // for the selection. This is relevant for determining whether
4410 // protected symbols are accessible.
4411 Symbol sitesym = TreeInfo.symbol(tree.selected);
4412
4413 boolean selectSuperPrev = env.info.selectSuper;
4414 env.info.selectSuper =
4415 sitesym != null &&
4416 sitesym.name == names._super;
4417
4418 // Determine the symbol represented by the selection.
4419 env.info.pendingResolutionPhase = null;
4420 Symbol sym = selectSym(tree, sitesym, site, env, resultInfo);
4421 if (sym.kind == VAR && sym.name != names._super && env.info.defaultSuperCallSite != null) {
4422 log.error(tree.selected.pos(), Errors.NotEnclClass(site.tsym));
4423 sym = syms.errSymbol;
4424 }
4425 if (sym.exists() && !isType(sym) && pkind().contains(KindSelector.TYP_PCK)) {
4426 site = capture(site);
4427 sym = selectSym(tree, sitesym, site, env, resultInfo);
4428 }
4429 boolean varArgs = env.info.lastResolveVarargs();
4430 tree.sym = sym;
4431
4432 if (site.hasTag(TYPEVAR) && !isType(sym) && sym.kind != ERR) {
4433 site = types.skipTypeVars(site, true);
4434 }
4435
4436 // If that symbol is a variable, ...
4437 if (sym.kind == VAR) {
4438 VarSymbol v = (VarSymbol)sym;
4439
4440 // ..., evaluate its initializer, if it has one, and check for
4441 // illegal forward reference.
4442 checkInit(tree, env, v, true);
4443
4444 // If we are expecting a variable (as opposed to a value), check
4445 // that the variable is assignable in the current environment.
4446 if (KindSelector.ASG.subset(pkind()))
4447 checkAssignable(tree.pos(), v, tree.selected, env);
4448 }
4449
4450 if (sitesym != null &&
4451 sitesym.kind == VAR &&
4452 ((VarSymbol)sitesym).isResourceVariable() &&
4453 sym.kind == MTH &&
4454 sym.name.equals(names.close) &&
4455 sym.overrides(syms.autoCloseableClose, sitesym.type.tsym, types, true) &&
4456 env.info.lint.isEnabled(LintCategory.TRY)) {
4457 log.warning(LintCategory.TRY, tree, Warnings.TryExplicitCloseCall);
4458 }
4459
4460 // Disallow selecting a type from an expression
4461 if (isType(sym) && (sitesym == null || !sitesym.kind.matches(KindSelector.TYP_PCK))) {
4462 tree.type = check(tree.selected, pt(),
4463 sitesym == null ?
4464 KindSelector.VAL : sitesym.kind.toSelector(),
4465 new ResultInfo(KindSelector.TYP_PCK, pt()));
4466 }
4467
4468 if (isType(sitesym)) {
4469 if (sym.name == names._this || sym.name == names._super) {
4470 // If `C' is the currently compiled class, check that
4471 // `C.this' does not appear in an explicit call to a constructor
4472 // also make sure that `super` is not used in constructor invocations
4473 if (env.info.isSelfCall &&
4474 ((sym.name == names._this &&
4475 site.tsym == env.enclClass.sym) ||
4476 sym.name == names._super && env.info.constructorArgs &&
4477 (sitesym.isInterface() || site.tsym == env.enclClass.sym))) {
4478 chk.earlyRefError(tree.pos(), sym);
4479 }
4480 } else {
4481 // Check if type-qualified fields or methods are static (JLS)
4482 if ((sym.flags() & STATIC) == 0 &&
4483 sym.name != names._super &&
4484 (sym.kind == VAR || sym.kind == MTH)) {
4485 rs.accessBase(rs.new StaticError(sym),
4486 tree.pos(), site, sym.name, true);
4487 }
4488 }
4489 } else if (sym.kind != ERR &&
4490 (sym.flags() & STATIC) != 0 &&
4491 sym.name != names._class) {
4492 // If the qualified item is not a type and the selected item is static, report
4493 // a warning. Make allowance for the class of an array type e.g. Object[].class)
4494 if (!sym.owner.isAnonymous()) {
4495 chk.warnStatic(tree, Warnings.StaticNotQualifiedByType(sym.kind.kindName(), sym.owner));
4496 } else {
4497 chk.warnStatic(tree, Warnings.StaticNotQualifiedByType2(sym.kind.kindName()));
4498 }
4499 }
4500
4501 // If we are selecting an instance member via a `super', ...
4502 if (env.info.selectSuper && (sym.flags() & STATIC) == 0) {
4503
4504 // Check that super-qualified symbols are not abstract (JLS)
4505 rs.checkNonAbstract(tree.pos(), sym);
4506
4507 if (site.isRaw()) {
4508 // Determine argument types for site.
4509 Type site1 = types.asSuper(env.enclClass.sym.type.referenceProjectionOrSelf(), site.tsym);
4510 if (site1 != null) site = site1;
4511 }
4512 }
4513
4514 if (env.info.isSerializable) {
4515 chk.checkAccessFromSerializableElement(tree, env.info.isSerializableLambda);
4516 }
4517
4518 env.info.selectSuper = selectSuperPrev;
4519 result = checkId(tree, site, sym, env, resultInfo);
4520 }
4521 //where
4522 /** Determine symbol referenced by a Select expression,
4523 *
4524 * @param tree The select tree.
4525 * @param site The type of the selected expression,
4526 * @param env The current environment.
4527 * @param resultInfo The current result.
4528 */
4529 private Symbol selectSym(JCFieldAccess tree,
4530 Symbol location,
4531 Type site,
4532 Env<AttrContext> env,
4533 ResultInfo resultInfo) {
4534 DiagnosticPosition pos = tree.pos();
4535 Name name = tree.name;
4536 switch (site.getTag()) {
4537 case PACKAGE:
4538 return rs.accessBase(
4539 rs.findIdentInPackage(pos, env, site.tsym, name, resultInfo.pkind),
4540 pos, location, site, name, true);
4541 case ARRAY:
4542 case CLASS:
4543 if (resultInfo.pt.hasTag(METHOD) || resultInfo.pt.hasTag(FORALL)) {
4544 return rs.resolveQualifiedMethod(
4545 pos, env, location, site, name, resultInfo.pt.getParameterTypes(), resultInfo.pt.getTypeArguments());
4546 } else if (name == names._this || name == names._super) {
4547 return rs.resolveSelf(pos, env, site.tsym, name);
4548 } else if (name == names._class) {
4549 // In this case, we have already made sure in
4550 // visitSelect that qualifier expression is a type.
4551 return syms.getClassField(site, types);
4552 } else if (site.isPrimitiveClass() && isType(location) && resultInfo.pkind.contains(KindSelector.TYP) && (name == names.ref || name == names.val)) {
4553 return site.tsym;
4554 } else {
4555 // We are seeing a plain identifier as selector.
4556 Symbol sym = rs.findIdentInType(pos, env, site, name, resultInfo.pkind);
4557 sym = rs.accessBase(sym, pos, location, site, name, true);
4558 return sym;
4559 }
4560 case WILDCARD:
4561 throw new AssertionError(tree);
4562 case TYPEVAR:
4563 // Normally, site.getUpperBound() shouldn't be null.
4564 // It should only happen during memberEnter/attribBase
4565 // when determining the supertype which *must* be
4566 // done before attributing the type variables. In
4567 // other words, we are seeing this illegal program:
4568 // class B<T> extends A<T.foo> {}
4569 Symbol sym = (site.getUpperBound() != null)
4570 ? selectSym(tree, location, capture(site.getUpperBound()), env, resultInfo)
4571 : null;
4572 if (sym == null) {
4573 log.error(pos, Errors.TypeVarCantBeDeref);
4574 return syms.errSymbol;
4575 } else {
4576 Symbol sym2 = (sym.flags() & Flags.PRIVATE) != 0 ?
4577 rs.new AccessError(env, site, sym) :
4578 sym;
4579 rs.accessBase(sym2, pos, location, site, name, true);
4580 return sym;
4581 }
4582 case ERROR:
4583 // preserve identifier names through errors
4584 return types.createErrorType(name, site.tsym, site).tsym;
4585 default:
4586 // The qualifier expression is of a primitive type -- only
4587 // .class is allowed for these.
4588 if (name == names._class) {
4589 // In this case, we have already made sure in Select that
4590 // qualifier expression is a type.
4591 return syms.getClassField(site, types);
4592 } else {
4593 log.error(pos, Errors.CantDeref(site));
4594 return syms.errSymbol;
4595 }
4596 }
4597 }
4598
4599 /** Determine type of identifier or select expression and check that
4600 * (1) the referenced symbol is not deprecated
4601 * (2) the symbol's type is safe (@see checkSafe)
4602 * (3) if symbol is a variable, check that its type and kind are
4603 * compatible with the prototype and protokind.
4604 * (4) if symbol is an instance field of a raw type,
4605 * which is being assigned to, issue an unchecked warning if its
4606 * type changes under erasure.
4607 * (5) if symbol is an instance method of a raw type, issue an
4608 * unchecked warning if its argument types change under erasure.
4609 * If checks succeed:
4610 * If symbol is a constant, return its constant type
4611 * else if symbol is a method, return its result type
4612 * otherwise return its type.
4613 * Otherwise return errType.
4614 *
4615 * @param tree The syntax tree representing the identifier
4616 * @param site If this is a select, the type of the selected
4617 * expression, otherwise the type of the current class.
4618 * @param sym The symbol representing the identifier.
4619 * @param env The current environment.
4620 * @param resultInfo The expected result
4621 */
4622 Type checkId(JCTree tree,
4623 Type site,
4624 Symbol sym,
4625 Env<AttrContext> env,
4626 ResultInfo resultInfo) {
4627 return (resultInfo.pt.hasTag(FORALL) || resultInfo.pt.hasTag(METHOD)) ?
4628 checkMethodIdInternal(tree, site, sym, env, resultInfo) :
4629 checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
4630 }
4631
4632 Type checkMethodIdInternal(JCTree tree,
4633 Type site,
4634 Symbol sym,
4635 Env<AttrContext> env,
4636 ResultInfo resultInfo) {
4637 if (resultInfo.pkind.contains(KindSelector.POLY)) {
4638 return attrRecover.recoverMethodInvocation(tree, site, sym, env, resultInfo);
4639 } else {
4640 return checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
4641 }
4642 }
4643
4644 Type checkIdInternal(JCTree tree,
4645 Type site,
4646 Symbol sym,
4647 Type pt,
4648 Env<AttrContext> env,
4649 ResultInfo resultInfo) {
4650 if (pt.isErroneous()) {
4651 return types.createErrorType(site);
4652 }
4653 Type owntype; // The computed type of this identifier occurrence.
4654 switch (sym.kind) {
4655 case TYP:
4656 // For types, the computed type equals the symbol's type,
4657 // except for three situations:
4658 owntype = sym.type;
4659 if (owntype.hasTag(CLASS)) {
4660 Assert.check(owntype.getFlavor() != Flavor.X_Typeof_X);
4661 chk.checkForBadAuxiliaryClassAccess(tree.pos(), env, (ClassSymbol)sym);
4662 Type ownOuter = owntype.getEnclosingType();
4663
4664 // (a) If symbol is a primitive class and its reference projection
4665 // is requested via the .ref notation, then adjust the computed type to
4666 // reflect this.
4667 if (owntype.isPrimitiveClass() && tree.hasTag(SELECT) && ((JCFieldAccess) tree).name == names.ref) {
4668 owntype = new ClassType(owntype.getEnclosingType(), owntype.getTypeArguments(), (TypeSymbol)sym, owntype.getMetadata(), Flavor.L_TypeOf_Q);
4669 }
4670
4671 // (b) If the symbol's type is parameterized, erase it
4672 // because no type parameters were given.
4673 // We recover generic outer type later in visitTypeApply.
4674 if (owntype.tsym.type.getTypeArguments().nonEmpty()) {
4675 owntype = types.erasure(owntype);
4676 }
4677
4678 // (c) If the symbol's type is an inner class, then
4679 // we have to interpret its outer type as a superclass
4680 // of the site type. Example:
4681 //
4682 // class Tree<A> { class Visitor { ... } }
4683 // class PointTree extends Tree<Point> { ... }
4684 // ...PointTree.Visitor...
4685 //
4686 // Then the type of the last expression above is
4687 // Tree<Point>.Visitor.
4688 else if (ownOuter.hasTag(CLASS) && site != ownOuter) {
4689 Type normOuter = site;
4690 if (normOuter.hasTag(CLASS)) {
4691 normOuter = types.asEnclosingSuper(site, ownOuter.tsym);
4692 }
4693 if (normOuter == null) // perhaps from an import
4694 normOuter = types.erasure(ownOuter);
4695 if (normOuter != ownOuter)
4696 owntype = new ClassType(
4697 normOuter, List.nil(), owntype.tsym,
4698 owntype.getMetadata(), owntype.getFlavor());
4699 }
4700 }
4701 break;
4702 case VAR:
4703 VarSymbol v = (VarSymbol)sym;
4704
4705 if (env.info.enclVar != null
4706 && v.type.hasTag(NONE)) {
4707 //self reference to implicitly typed variable declaration
4708 log.error(TreeInfo.positionFor(v, env.enclClass), Errors.CantInferLocalVarType(v.name, Fragments.LocalSelfRef));
4709 return v.type = types.createErrorType(v.type);
4710 }
4711
4712 // Test (4): if symbol is an instance field of a raw type,
4713 // which is being assigned to, issue an unchecked warning if
4714 // its type changes under erasure.
4715 if (KindSelector.ASG.subset(pkind()) &&
4716 v.owner.kind == TYP &&
4717 (v.flags() & STATIC) == 0 &&
4718 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
4719 Type s = types.asOuterSuper(site, v.owner);
4720 if (s != null &&
4721 s.isRaw() &&
4722 !types.isSameType(v.type, v.erasure(types))) {
4723 chk.warnUnchecked(tree.pos(), Warnings.UncheckedAssignToVar(v, s));
4724 }
4725 }
4726 // The computed type of a variable is the type of the
4727 // variable symbol, taken as a member of the site type.
4728 owntype = (sym.owner.kind == TYP &&
4729 sym.name != names._this && sym.name != names._super)
4730 ? types.memberType(site, sym)
4731 : sym.type;
4732
4733 // If the variable is a constant, record constant value in
4734 // computed type.
4735 if (v.getConstValue() != null && isStaticReference(tree))
4736 owntype = owntype.constType(v.getConstValue());
4737
4738 if (resultInfo.pkind == KindSelector.VAL) {
4739 owntype = capture(owntype); // capture "names as expressions"
4740 }
4741 break;
4742 case MTH: {
4743 owntype = checkMethod(site, sym,
4744 new ResultInfo(resultInfo.pkind, resultInfo.pt.getReturnType(), resultInfo.checkContext, resultInfo.checkMode),
4745 env, TreeInfo.args(env.tree), resultInfo.pt.getParameterTypes(),
4746 resultInfo.pt.getTypeArguments());
4747 break;
4748 }
4749 case PCK: case ERR:
4750 owntype = sym.type;
4751 break;
4752 default:
4753 throw new AssertionError("unexpected kind: " + sym.kind +
4754 " in tree " + tree);
4755 }
4756
4757 // Emit a `deprecation' warning if symbol is deprecated.
4758 // (for constructors (but not for constructor references), the error
4759 // was given when the constructor was resolved)
4760
4761 if (sym.name != names.init || tree.hasTag(REFERENCE)) {
4762 chk.checkDeprecated(tree.pos(), env.info.scope.owner, sym);
4763 chk.checkSunAPI(tree.pos(), sym);
4764 chk.checkProfile(tree.pos(), sym);
4765 chk.checkPreview(tree.pos(), env.info.scope.owner, sym);
4766 }
4767
4768 // If symbol is a variable, check that its type and
4769 // kind are compatible with the prototype and protokind.
4770 return check(tree, owntype, sym.kind.toSelector(), resultInfo);
4771 }
4772
4773 /** Check that variable is initialized and evaluate the variable's
4774 * initializer, if not yet done. Also check that variable is not
4775 * referenced before it is defined.
4776 * @param tree The tree making up the variable reference.
4777 * @param env The current environment.
4778 * @param v The variable's symbol.
4779 */
4780 private void checkInit(JCTree tree,
4781 Env<AttrContext> env,
4782 VarSymbol v,
4783 boolean onlyWarning) {
4784 // A forward reference is diagnosed if the declaration position
4785 // of the variable is greater than the current tree position
4786 // and the tree and variable definition occur in the same class
4787 // definition. Note that writes don't count as references.
4788 // This check applies only to class and instance
4789 // variables. Local variables follow different scope rules,
4790 // and are subject to definite assignment checking.
4791 Env<AttrContext> initEnv = enclosingInitEnv(env);
4792 if (initEnv != null &&
4793 (initEnv.info.enclVar == v || v.pos > tree.pos) &&
4794 v.owner.kind == TYP &&
4795 v.owner == env.info.scope.owner.enclClass() &&
4796 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env) &&
4797 (!env.tree.hasTag(ASSIGN) ||
4798 TreeInfo.skipParens(((JCAssign) env.tree).lhs) != tree)) {
4799 if (!onlyWarning || isStaticEnumField(v)) {
4800 Error errkey = (initEnv.info.enclVar == v) ?
4801 Errors.IllegalSelfRef : Errors.IllegalForwardRef;
4802 log.error(tree.pos(), errkey);
4803 } else if (useBeforeDeclarationWarning) {
4804 Warning warnkey = (initEnv.info.enclVar == v) ?
4805 Warnings.SelfRef(v) : Warnings.ForwardRef(v);
4806 log.warning(tree.pos(), warnkey);
4807 }
4808 }
4809
4810 v.getConstValue(); // ensure initializer is evaluated
4811
4812 checkEnumInitializer(tree, env, v);
4813 }
4814
4815 /**
4816 * Returns the enclosing init environment associated with this env (if any). An init env
4817 * can be either a field declaration env or a static/instance initializer env.
4818 */
4819 Env<AttrContext> enclosingInitEnv(Env<AttrContext> env) {
4820 while (true) {
4821 switch (env.tree.getTag()) {
4822 case VARDEF:
4823 JCVariableDecl vdecl = (JCVariableDecl)env.tree;
4824 if (vdecl.sym.owner.kind == TYP) {
4825 //field
4826 return env;
4827 }
4828 break;
4829 case BLOCK:
4830 if (env.next.tree.hasTag(CLASSDEF)) {
4831 //instance/static initializer
4832 return env;
4833 }
4834 break;
4835 case METHODDEF:
4836 case CLASSDEF:
4837 case TOPLEVEL:
4838 return null;
4839 }
4840 Assert.checkNonNull(env.next);
4841 env = env.next;
4842 }
4843 }
4844
4845 /**
4846 * Check for illegal references to static members of enum. In
4847 * an enum type, constructors and initializers may not
4848 * reference its static members unless they are constant.
4849 *
4850 * @param tree The tree making up the variable reference.
4851 * @param env The current environment.
4852 * @param v The variable's symbol.
4853 * @jls 8.9 Enum Types
4854 */
4855 private void checkEnumInitializer(JCTree tree, Env<AttrContext> env, VarSymbol v) {
4856 // JLS:
4857 //
4858 // "It is a compile-time error to reference a static field
4859 // of an enum type that is not a compile-time constant
4860 // (15.28) from constructors, instance initializer blocks,
4861 // or instance variable initializer expressions of that
4862 // type. It is a compile-time error for the constructors,
4863 // instance initializer blocks, or instance variable
4864 // initializer expressions of an enum constant e to refer
4865 // to itself or to an enum constant of the same type that
4866 // is declared to the right of e."
4867 if (isStaticEnumField(v)) {
4868 ClassSymbol enclClass = env.info.scope.owner.enclClass();
4869
4870 if (enclClass == null || enclClass.owner == null)
4871 return;
4872
4873 // See if the enclosing class is the enum (or a
4874 // subclass thereof) declaring v. If not, this
4875 // reference is OK.
4876 if (v.owner != enclClass && !types.isSubtype(enclClass.type, v.owner.type))
4877 return;
4878
4879 // If the reference isn't from an initializer, then
4880 // the reference is OK.
4881 if (!Resolve.isInitializer(env))
4882 return;
4883
4884 log.error(tree.pos(), Errors.IllegalEnumStaticRef);
4885 }
4886 }
4887
4888 /** Is the given symbol a static, non-constant field of an Enum?
4889 * Note: enum literals should not be regarded as such
4890 */
4891 private boolean isStaticEnumField(VarSymbol v) {
4892 return Flags.isEnum(v.owner) &&
4893 Flags.isStatic(v) &&
4894 !Flags.isConstant(v) &&
4895 v.name != names._class;
4896 }
4897
4898 /**
4899 * Check that method arguments conform to its instantiation.
4900 **/
4901 public Type checkMethod(Type site,
4902 final Symbol sym,
4903 ResultInfo resultInfo,
4904 Env<AttrContext> env,
4905 final List<JCExpression> argtrees,
4906 List<Type> argtypes,
4907 List<Type> typeargtypes) {
4908 // Test (5): if symbol is an instance method of a raw type, issue
4909 // an unchecked warning if its argument types change under erasure.
4910 if ((sym.flags() & STATIC) == 0 &&
4911 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
4912 Type s = types.asOuterSuper(site, sym.owner);
4913 if (s != null && s.isRaw() &&
4914 !types.isSameTypes(sym.type.getParameterTypes(),
4915 sym.erasure(types).getParameterTypes())) {
4916 chk.warnUnchecked(env.tree.pos(), Warnings.UncheckedCallMbrOfRawType(sym, s));
4917 }
4918 }
4919
4920 if (env.info.defaultSuperCallSite != null) {
4921 for (Type sup : types.interfaces(env.enclClass.type).prepend(types.supertype((env.enclClass.type)))) {
4922 if (!sup.tsym.isSubClass(sym.enclClass(), types) ||
4923 types.isSameType(sup, env.info.defaultSuperCallSite)) continue;
4924 List<MethodSymbol> icand_sup =
4925 types.interfaceCandidates(sup, (MethodSymbol)sym);
4926 if (icand_sup.nonEmpty() &&
4927 icand_sup.head != sym &&
4928 icand_sup.head.overrides(sym, icand_sup.head.enclClass(), types, true)) {
4929 log.error(env.tree.pos(),
4930 Errors.IllegalDefaultSuperCall(env.info.defaultSuperCallSite, Fragments.OverriddenDefault(sym, sup)));
4931 break;
4932 }
4933 }
4934 env.info.defaultSuperCallSite = null;
4935 }
4936
4937 if (sym.isStatic() && site.isInterface() && env.tree.hasTag(APPLY)) {
4938 JCMethodInvocation app = (JCMethodInvocation)env.tree;
4939 if (app.meth.hasTag(SELECT) &&
4940 !TreeInfo.isStaticSelector(((JCFieldAccess)app.meth).selected, names)) {
4941 log.error(env.tree.pos(), Errors.IllegalStaticIntfMethCall(site));
4942 }
4943 }
4944
4945 // Compute the identifier's instantiated type.
4946 // For methods, we need to compute the instance type by
4947 // Resolve.instantiate from the symbol's type as well as
4948 // any type arguments and value arguments.
4949 Warner noteWarner = new Warner();
4950 try {
4951 Type owntype = rs.checkMethod(
4952 env,
4953 site,
4954 sym,
4955 resultInfo,
4956 argtypes,
4957 typeargtypes,
4958 noteWarner);
4959
4960 DeferredAttr.DeferredTypeMap<Void> checkDeferredMap =
4961 deferredAttr.new DeferredTypeMap<>(DeferredAttr.AttrMode.CHECK, sym, env.info.pendingResolutionPhase);
4962
4963 argtypes = argtypes.map(checkDeferredMap);
4964
4965 if (noteWarner.hasNonSilentLint(LintCategory.UNCHECKED)) {
4966 chk.warnUnchecked(env.tree.pos(), Warnings.UncheckedMethInvocationApplied(kindName(sym),
4967 sym.name,
4968 rs.methodArguments(sym.type.getParameterTypes()),
4969 rs.methodArguments(argtypes.map(checkDeferredMap)),
4970 kindName(sym.location()),
4971 sym.location()));
4972 if (resultInfo.pt != Infer.anyPoly ||
4973 !owntype.hasTag(METHOD) ||
4974 !owntype.isPartial()) {
4975 //if this is not a partially inferred method type, erase return type. Otherwise,
4976 //erasure is carried out in PartiallyInferredMethodType.check().
4977 owntype = new MethodType(owntype.getParameterTypes(),
4978 types.erasure(owntype.getReturnType()),
4979 types.erasure(owntype.getThrownTypes()),
4980 syms.methodClass);
4981 }
4982 }
4983
4984 PolyKind pkind = (sym.type.hasTag(FORALL) &&
4985 sym.type.getReturnType().containsAny(((ForAll)sym.type).tvars)) ?
4986 PolyKind.POLY : PolyKind.STANDALONE;
4987 TreeInfo.setPolyKind(env.tree, pkind);
4988
4989 return (resultInfo.pt == Infer.anyPoly) ?
4990 owntype :
4991 chk.checkMethod(owntype, sym, env, argtrees, argtypes, env.info.lastResolveVarargs(),
4992 resultInfo.checkContext.inferenceContext());
4993 } catch (Infer.InferenceException ex) {
4994 //invalid target type - propagate exception outwards or report error
4995 //depending on the current check context
4996 resultInfo.checkContext.report(env.tree.pos(), ex.getDiagnostic());
4997 return types.createErrorType(site);
4998 } catch (Resolve.InapplicableMethodException ex) {
4999 final JCDiagnostic diag = ex.getDiagnostic();
5000 Resolve.InapplicableSymbolError errSym = rs.new InapplicableSymbolError(null) {
5001 @Override
5002 protected Pair<Symbol, JCDiagnostic> errCandidate() {
5003 return new Pair<>(sym, diag);
5004 }
5005 };
5006 List<Type> argtypes2 = argtypes.map(
5007 rs.new ResolveDeferredRecoveryMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase));
5008 JCDiagnostic errDiag = errSym.getDiagnostic(JCDiagnostic.DiagnosticType.ERROR,
5009 env.tree, sym, site, sym.name, argtypes2, typeargtypes);
5010 log.report(errDiag);
5011 return types.createErrorType(site);
5012 }
5013 }
5014
5015 public void visitDefaultValue(JCDefaultValue tree) {
5016 if (!allowPrimitiveClasses) {
5017 log.error(DiagnosticFlag.SOURCE_LEVEL, tree.pos(),
5018 Feature.PRIMITIVE_CLASSES.error(sourceName));
5019 }
5020
5021 // Attribute the qualifier expression, and determine its symbol (if any).
5022 Type site = attribTree(tree.clazz, env, new ResultInfo(KindSelector.TYP_PCK, Type.noType));
5023 if (!pkind().contains(KindSelector.TYP_PCK))
5024 site = capture(site); // Capture field access
5025
5026 Symbol sym = switch (site.getTag()) {
5027 case WILDCARD -> throw new AssertionError(tree);
5028 case PACKAGE -> {
5029 log.error(tree.pos, Errors.CantResolveLocation(Kinds.KindName.CLASS, site.tsym.getQualifiedName(), null, null,
5030 Fragments.Location(Kinds.typeKindName(env.enclClass.type), env.enclClass.type, null)));
5031 yield syms.errSymbol;
5032 }
5033 case ERROR -> types.createErrorType(names._default, site.tsym, site).tsym;
5034 default -> new VarSymbol(STATIC, names._default, site, site.tsym);
5035 };
5036
5037 if (site.hasTag(TYPEVAR) && sym.kind != ERR) {
5038 site = types.skipTypeVars(site, true);
5039 }
5040 result = checkId(tree, site, sym, env, resultInfo);
5041 }
5042
5043 public void visitLiteral(JCLiteral tree) {
5044 result = check(tree, litType(tree.typetag).constType(tree.value),
5045 KindSelector.VAL, resultInfo);
5046 }
5047 //where
5048 /** Return the type of a literal with given type tag.
5049 */
5050 Type litType(TypeTag tag) {
5051 return (tag == CLASS) ? syms.stringType : syms.typeOfTag[tag.ordinal()];
5052 }
5053
5054 public void visitTypeIdent(JCPrimitiveTypeTree tree) {
5055 result = check(tree, syms.typeOfTag[tree.typetag.ordinal()], KindSelector.TYP, resultInfo);
5056 }
5057
5058 public void visitTypeArray(JCArrayTypeTree tree) {
5059 Type etype = attribType(tree.elemtype, env);
5060 Type type = new ArrayType(etype, syms.arrayClass);
5061 result = check(tree, type, KindSelector.TYP, resultInfo);
5062 }
5063
5064 /** Visitor method for parameterized types.
5065 * Bound checking is left until later, since types are attributed
5066 * before supertype structure is completely known
5067 */
5068 public void visitTypeApply(JCTypeApply tree) {
5069 Type owntype = types.createErrorType(tree.type);
5070
5071 // Attribute functor part of application and make sure it's a class.
5072 Type clazztype = chk.checkClassType(tree.clazz.pos(), attribType(tree.clazz, env));
5073
5074 // Attribute type parameters
5075 List<Type> actuals = attribTypes(tree.arguments, env);
5076
5077 if (clazztype.hasTag(CLASS)) {
5078 List<Type> formals = clazztype.tsym.type.getTypeArguments();
5079 if (actuals.isEmpty()) //diamond
5080 actuals = formals;
5081
5082 if (actuals.length() == formals.length()) {
5083 List<Type> a = actuals;
5084 List<Type> f = formals;
5085 while (a.nonEmpty()) {
5086 a.head = a.head.withTypeVar(f.head);
5087 a = a.tail;
5088 f = f.tail;
5089 }
5090 // Compute the proper generic outer
5091 Type clazzOuter = clazztype.getEnclosingType();
5092 if (clazzOuter.hasTag(CLASS)) {
5093 Type site;
5094 JCExpression clazz = TreeInfo.typeIn(tree.clazz);
5095 if (clazz.hasTag(IDENT)) {
5096 site = env.enclClass.sym.type;
5097 } else if (clazz.hasTag(SELECT)) {
5098 site = ((JCFieldAccess) clazz).selected.type;
5099 } else throw new AssertionError(""+tree);
5100 if (clazzOuter.hasTag(CLASS) && site != clazzOuter) {
5101 if (site.hasTag(CLASS))
5102 site = types.asOuterSuper(site, clazzOuter.tsym);
5103 if (site == null)
5104 site = types.erasure(clazzOuter);
5105 clazzOuter = site;
5106 }
5107 }
5108 owntype = new ClassType(clazzOuter, actuals, clazztype.tsym,
5109 clazztype.getMetadata(), clazztype.getFlavor());
5110 } else {
5111 if (formals.length() != 0) {
5112 log.error(tree.pos(),
5113 Errors.WrongNumberTypeArgs(Integer.toString(formals.length())));
5114 } else {
5115 log.error(tree.pos(), Errors.TypeDoesntTakeParams(clazztype.tsym));
5116 }
5117 owntype = types.createErrorType(tree.type);
5118 }
5119 }
5120 result = check(tree, owntype, KindSelector.TYP, resultInfo);
5121 }
5122
5123 public void visitTypeUnion(JCTypeUnion tree) {
5124 ListBuffer<Type> multicatchTypes = new ListBuffer<>();
5125 ListBuffer<Type> all_multicatchTypes = null; // lazy, only if needed
5126 for (JCExpression typeTree : tree.alternatives) {
5127 Type ctype = attribType(typeTree, env);
5128 ctype = chk.checkType(typeTree.pos(),
5129 chk.checkClassType(typeTree.pos(), ctype),
5130 syms.throwableType);
5131 if (!ctype.isErroneous()) {
5132 //check that alternatives of a union type are pairwise
5133 //unrelated w.r.t. subtyping
5134 if (chk.intersects(ctype, multicatchTypes.toList())) {
5135 for (Type t : multicatchTypes) {
5136 boolean sub = types.isSubtype(ctype, t);
5137 boolean sup = types.isSubtype(t, ctype);
5138 if (sub || sup) {
5139 //assume 'a' <: 'b'
5140 Type a = sub ? ctype : t;
5141 Type b = sub ? t : ctype;
5142 log.error(typeTree.pos(), Errors.MulticatchTypesMustBeDisjoint(a, b));
5143 }
5144 }
5145 }
5146 multicatchTypes.append(ctype);
5147 if (all_multicatchTypes != null)
5148 all_multicatchTypes.append(ctype);
5149 } else {
5150 if (all_multicatchTypes == null) {
5151 all_multicatchTypes = new ListBuffer<>();
5152 all_multicatchTypes.appendList(multicatchTypes);
5153 }
5154 all_multicatchTypes.append(ctype);
5155 }
5156 }
5157 Type t = check(tree, types.lub(multicatchTypes.toList()),
5158 KindSelector.TYP, resultInfo.dup(CheckMode.NO_TREE_UPDATE));
5159 if (t.hasTag(CLASS)) {
5160 List<Type> alternatives =
5161 ((all_multicatchTypes == null) ? multicatchTypes : all_multicatchTypes).toList();
5162 t = new UnionClassType((ClassType) t, alternatives);
5163 }
5164 tree.type = result = t;
5165 }
5166
5167 public void visitTypeIntersection(JCTypeIntersection tree) {
5168 attribTypes(tree.bounds, env);
5169 tree.type = result = checkIntersection(tree, tree.bounds);
5170 }
5171
5172 public void visitTypeParameter(JCTypeParameter tree) {
5173 TypeVar typeVar = (TypeVar) tree.type;
5174
5175 if (tree.annotations != null && tree.annotations.nonEmpty()) {
5176 annotate.annotateTypeParameterSecondStage(tree, tree.annotations);
5177 }
5178
5179 if (!typeVar.getUpperBound().isErroneous()) {
5180 //fixup type-parameter bound computed in 'attribTypeVariables'
5181 typeVar.setUpperBound(checkIntersection(tree, tree.bounds));
5182 }
5183 }
5184
5185 Type checkIntersection(JCTree tree, List<JCExpression> bounds) {
5186 Set<Type> boundSet = new HashSet<>();
5187 if (bounds.nonEmpty()) {
5188 // accept class or interface or typevar as first bound.
5189 bounds.head.type = checkBase(bounds.head.type, bounds.head, env, false, false, false);
5190 boundSet.add(types.erasure(bounds.head.type));
5191 if (bounds.head.type.isErroneous()) {
5192 return bounds.head.type;
5193 }
5194 else if (bounds.head.type.hasTag(TYPEVAR)) {
5195 // if first bound was a typevar, do not accept further bounds.
5196 if (bounds.tail.nonEmpty()) {
5197 log.error(bounds.tail.head.pos(),
5198 Errors.TypeVarMayNotBeFollowedByOtherBounds);
5199 return bounds.head.type;
5200 }
5201 } else {
5202 // if first bound was a class or interface, accept only interfaces
5203 // as further bounds.
5204 for (JCExpression bound : bounds.tail) {
5205 bound.type = checkBase(bound.type, bound, env, false, true, false);
5206 if (bound.type.isErroneous()) {
5207 bounds = List.of(bound);
5208 }
5209 else if (bound.type.hasTag(CLASS)) {
5210 chk.checkNotRepeated(bound.pos(), types.erasure(bound.type), boundSet);
5211 }
5212 }
5213 }
5214 }
5215
5216 if (bounds.length() == 0) {
5217 return syms.objectType;
5218 } else if (bounds.length() == 1) {
5219 return bounds.head.type;
5220 } else {
5221 Type owntype = types.makeIntersectionType(TreeInfo.types(bounds));
5222 // ... the variable's bound is a class type flagged COMPOUND
5223 // (see comment for TypeVar.bound).
5224 // In this case, generate a class tree that represents the
5225 // bound class, ...
5226 JCExpression extending;
5227 List<JCExpression> implementing;
5228 if (!bounds.head.type.isInterface()) {
5229 extending = bounds.head;
5230 implementing = bounds.tail;
5231 } else {
5232 extending = null;
5233 implementing = bounds;
5234 }
5235 JCClassDecl cd = make.at(tree).ClassDef(
5236 make.Modifiers(PUBLIC | ABSTRACT | (extending != null && TreeInfo.symbol(extending).isPrimitiveClass() ? PRIMITIVE_CLASS : 0)),
5237 names.empty, List.nil(),
5238 extending, implementing, List.nil());
5239
5240 ClassSymbol c = (ClassSymbol)owntype.tsym;
5241 Assert.check((c.flags() & COMPOUND) != 0);
5242 cd.sym = c;
5243 c.sourcefile = env.toplevel.sourcefile;
5244
5245 // ... and attribute the bound class
5246 c.flags_field |= UNATTRIBUTED;
5247 Env<AttrContext> cenv = enter.classEnv(cd, env);
5248 typeEnvs.put(c, cenv);
5249 attribClass(c);
5250 return owntype;
5251 }
5252 }
5253
5254 public void visitWildcard(JCWildcard tree) {
5255 //- System.err.println("visitWildcard("+tree+");");//DEBUG
5256 Type type = (tree.kind.kind == BoundKind.UNBOUND)
5257 ? syms.objectType
5258 : attribType(tree.inner, env);
5259 result = check(tree, new WildcardType(chk.checkRefType(tree.pos(), type, false),
5260 tree.kind.kind,
5261 syms.boundClass),
5262 KindSelector.TYP, resultInfo);
5263 }
5264
5265 public void visitAnnotation(JCAnnotation tree) {
5266 Assert.error("should be handled in annotate");
5267 }
5268
5269 @Override
5270 public void visitModifiers(JCModifiers tree) {
5271 //error recovery only:
5272 Assert.check(resultInfo.pkind == KindSelector.ERR);
5273
5274 attribAnnotationTypes(tree.annotations, env);
5275 }
5276
5277 public void visitAnnotatedType(JCAnnotatedType tree) {
5278 attribAnnotationTypes(tree.annotations, env);
5279 Type underlyingType = attribType(tree.underlyingType, env);
5280 Type annotatedType = underlyingType.annotatedType(Annotations.TO_BE_SET);
5281
5282 if (!env.info.isNewClass)
5283 annotate.annotateTypeSecondStage(tree, tree.annotations, annotatedType);
5284 result = tree.type = annotatedType;
5285 }
5286
5287 public void visitErroneous(JCErroneous tree) {
5288 if (tree.errs != null) {
5289 Env<AttrContext> errEnv = env.dup(env.tree);
5290 errEnv.info.returnResult = unknownExprInfo;
5291 for (JCTree err : tree.errs)
5292 attribTree(err, errEnv, new ResultInfo(KindSelector.ERR, pt()));
5293 }
5294 result = tree.type = syms.errType;
5295 }
5296
5297 /** Default visitor method for all other trees.
5298 */
5299 public void visitTree(JCTree tree) {
5300 throw new AssertionError();
5301 }
5302
5303 /**
5304 * Attribute an env for either a top level tree or class or module declaration.
5305 */
5306 public void attrib(Env<AttrContext> env) {
5307 switch (env.tree.getTag()) {
5308 case MODULEDEF:
5309 attribModule(env.tree.pos(), ((JCModuleDecl)env.tree).sym);
5310 break;
5311 case PACKAGEDEF:
5312 attribPackage(env.tree.pos(), ((JCPackageDecl) env.tree).packge);
5313 break;
5314 default:
5315 attribClass(env.tree.pos(), env.enclClass.sym);
5316 }
5317 }
5318
5319 public void attribPackage(DiagnosticPosition pos, PackageSymbol p) {
5320 try {
5321 annotate.flush();
5322 attribPackage(p);
5323 } catch (CompletionFailure ex) {
5324 chk.completionError(pos, ex);
5325 }
5326 }
5327
5328 void attribPackage(PackageSymbol p) {
5329 attribWithLint(p,
5330 env -> chk.checkDeprecatedAnnotation(((JCPackageDecl) env.tree).pid.pos(), p));
5331 }
5332
5333 public void attribModule(DiagnosticPosition pos, ModuleSymbol m) {
5334 try {
5335 annotate.flush();
5336 attribModule(m);
5337 } catch (CompletionFailure ex) {
5338 chk.completionError(pos, ex);
5339 }
5340 }
5341
5342 void attribModule(ModuleSymbol m) {
5343 attribWithLint(m, env -> attribStat(env.tree, env));
5344 }
5345
5346 private void attribWithLint(TypeSymbol sym, Consumer<Env<AttrContext>> attrib) {
5347 Env<AttrContext> env = typeEnvs.get(sym);
5348
5349 Env<AttrContext> lintEnv = env;
5350 while (lintEnv.info.lint == null)
5351 lintEnv = lintEnv.next;
5352
5353 Lint lint = lintEnv.info.lint.augment(sym);
5354
5355 Lint prevLint = chk.setLint(lint);
5356 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
5357
5358 try {
5359 deferredLintHandler.flush(env.tree.pos());
5360 attrib.accept(env);
5361 } finally {
5362 log.useSource(prev);
5363 chk.setLint(prevLint);
5364 }
5365 }
5366
5367 /** Main method: attribute class definition associated with given class symbol.
5368 * reporting completion failures at the given position.
5369 * @param pos The source position at which completion errors are to be
5370 * reported.
5371 * @param c The class symbol whose definition will be attributed.
5372 */
5373 public void attribClass(DiagnosticPosition pos, ClassSymbol c) {
5374 try {
5375 annotate.flush();
5376 attribClass(c);
5377 if (c.type.isPrimitiveClass()) {
5378 final Env<AttrContext> env = typeEnvs.get(c);
5379 if (env != null && env.tree != null && env.tree.hasTag(CLASSDEF))
5380 chk.checkNonCyclicMembership((JCClassDecl)env.tree);
5381 }
5382 } catch (CompletionFailure ex) {
5383 chk.completionError(pos, ex);
5384 }
5385 }
5386
5387 /** Attribute class definition associated with given class symbol.
5388 * @param c The class symbol whose definition will be attributed.
5389 */
5390 void attribClass(ClassSymbol c) throws CompletionFailure {
5391 if (c.type.hasTag(ERROR)) return;
5392
5393 // Check for cycles in the inheritance graph, which can arise from
5394 // ill-formed class files.
5395 chk.checkNonCyclic(null, c.type);
5396
5397 Type st = types.supertype(c.type);
5398 if ((c.flags_field & Flags.COMPOUND) == 0 &&
5399 (c.flags_field & Flags.SUPER_OWNER_ATTRIBUTED) == 0) {
5400 // First, attribute superclass.
5401 if (st.hasTag(CLASS))
5402 attribClass((ClassSymbol)st.tsym);
5403
5404 // Next attribute owner, if it is a class.
5405 if (c.owner.kind == TYP && c.owner.type.hasTag(CLASS))
5406 attribClass((ClassSymbol)c.owner);
5407
5408 c.flags_field |= Flags.SUPER_OWNER_ATTRIBUTED;
5409 }
5410
5411 // The previous operations might have attributed the current class
5412 // if there was a cycle. So we test first whether the class is still
5413 // UNATTRIBUTED.
5414 if ((c.flags_field & UNATTRIBUTED) != 0) {
5415 c.flags_field &= ~UNATTRIBUTED;
5416
5417 // Get environment current at the point of class definition.
5418 Env<AttrContext> env = typeEnvs.get(c);
5419
5420 if (c.isSealed() &&
5421 !c.isEnum() &&
5422 !c.isPermittedExplicit &&
5423 c.permitted.isEmpty()) {
5424 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.SealedClassMustHaveSubclasses);
5425 }
5426
5427 if (c.isSealed()) {
5428 Set<Symbol> permittedTypes = new HashSet<>();
5429 boolean sealedInUnnamed = c.packge().modle == syms.unnamedModule || c.packge().modle == syms.noModule;
5430 for (Symbol subTypeSym : c.permitted) {
5431 boolean isTypeVar = false;
5432 if (subTypeSym.type.getTag() == TYPEVAR) {
5433 isTypeVar = true; //error recovery
5434 log.error(TreeInfo.diagnosticPositionFor(subTypeSym, env.tree),
5435 Errors.InvalidPermitsClause(Fragments.IsATypeVariable(subTypeSym.type)));
5436 }
5437 if (subTypeSym.isAnonymous() && !c.isEnum()) {
5438 log.error(TreeInfo.diagnosticPositionFor(subTypeSym, env.tree), Errors.LocalClassesCantExtendSealed(Fragments.Anonymous));
5439 }
5440 if (permittedTypes.contains(subTypeSym)) {
5441 DiagnosticPosition pos =
5442 env.enclClass.permitting.stream()
5443 .filter(permittedExpr -> TreeInfo.diagnosticPositionFor(subTypeSym, permittedExpr, true) != null)
5444 .limit(2).collect(List.collector()).get(1);
5445 log.error(pos, Errors.InvalidPermitsClause(Fragments.IsDuplicated(subTypeSym.type)));
5446 } else {
5447 permittedTypes.add(subTypeSym);
5448 }
5449 if (sealedInUnnamed) {
5450 if (subTypeSym.packge() != c.packge()) {
5451 log.error(TreeInfo.diagnosticPositionFor(subTypeSym, env.tree),
5452 Errors.ClassInUnnamedModuleCantExtendSealedInDiffPackage(c)
5453 );
5454 }
5455 } else if (subTypeSym.packge().modle != c.packge().modle) {
5456 log.error(TreeInfo.diagnosticPositionFor(subTypeSym, env.tree),
5457 Errors.ClassInModuleCantExtendSealedInDiffModule(c, c.packge().modle)
5458 );
5459 }
5460 if (subTypeSym == c.type.tsym || types.isSuperType(subTypeSym.type, c.type)) {
5461 log.error(TreeInfo.diagnosticPositionFor(subTypeSym, ((JCClassDecl)env.tree).permitting),
5462 Errors.InvalidPermitsClause(
5463 subTypeSym == c.type.tsym ?
5464 Fragments.MustNotBeSameClass :
5465 Fragments.MustNotBeSupertype(subTypeSym.type)
5466 )
5467 );
5468 } else if (!isTypeVar) {
5469 boolean thisIsASuper = types.directSupertypes(subTypeSym.type)
5470 .stream()
5471 .anyMatch(d -> d.tsym == c);
5472 if (!thisIsASuper) {
5473 log.error(TreeInfo.diagnosticPositionFor(subTypeSym, env.tree),
5474 Errors.InvalidPermitsClause(Fragments.DoesntExtendSealed(subTypeSym.type)));
5475 }
5476 }
5477 }
5478 }
5479
5480 List<ClassSymbol> sealedSupers = types.directSupertypes(c.type)
5481 .stream()
5482 .filter(s -> s.tsym.isSealed())
5483 .map(s -> (ClassSymbol) s.tsym)
5484 .collect(List.collector());
5485
5486 if (sealedSupers.isEmpty()) {
5487 if ((c.flags_field & Flags.NON_SEALED) != 0) {
5488 boolean hasErrorSuper = false;
5489
5490 hasErrorSuper |= types.directSupertypes(c.type)
5491 .stream()
5492 .anyMatch(s -> s.tsym.kind == Kind.ERR);
5493
5494 ClassType ct = (ClassType) c.type;
5495
5496 hasErrorSuper |= !ct.isCompound() && ct.interfaces_field != ct.all_interfaces_field;
5497
5498 if (!hasErrorSuper) {
5499 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.NonSealedWithNoSealedSupertype(c));
5500 }
5501 }
5502 } else if ((c.flags_field & Flags.COMPOUND) == 0) {
5503 if (c.isDirectlyOrIndirectlyLocal() && !c.isEnum()) {
5504 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.LocalClassesCantExtendSealed(c.isAnonymous() ? Fragments.Anonymous : Fragments.Local));
5505 }
5506
5507 if (!c.type.isCompound()) {
5508 for (ClassSymbol supertypeSym : sealedSupers) {
5509 if (!supertypeSym.permitted.contains(c.type.tsym)) {
5510 log.error(TreeInfo.diagnosticPositionFor(c.type.tsym, env.tree), Errors.CantInheritFromSealed(supertypeSym));
5511 }
5512 }
5513 if (!c.isNonSealed() && !c.isFinal() && !c.isSealed()) {
5514 log.error(TreeInfo.diagnosticPositionFor(c, env.tree),
5515 c.isInterface() ?
5516 Errors.NonSealedOrSealedExpected :
5517 Errors.NonSealedSealedOrFinalExpected);
5518 }
5519 }
5520 }
5521
5522 // The info.lint field in the envs stored in typeEnvs is deliberately uninitialized,
5523 // because the annotations were not available at the time the env was created. Therefore,
5524 // we look up the environment chain for the first enclosing environment for which the
5525 // lint value is set. Typically, this is the parent env, but might be further if there
5526 // are any envs created as a result of TypeParameter nodes.
5527 Env<AttrContext> lintEnv = env;
5528 while (lintEnv.info.lint == null)
5529 lintEnv = lintEnv.next;
5530
5531 // Having found the enclosing lint value, we can initialize the lint value for this class
5532 env.info.lint = lintEnv.info.lint.augment(c);
5533
5534 Lint prevLint = chk.setLint(env.info.lint);
5535 JavaFileObject prev = log.useSource(c.sourcefile);
5536 ResultInfo prevReturnRes = env.info.returnResult;
5537
5538 try {
5539 deferredLintHandler.flush(env.tree);
5540 env.info.returnResult = null;
5541 // java.lang.Enum may not be subclassed by a non-enum
5542 if (st.tsym == syms.enumSym &&
5543 ((c.flags_field & (Flags.ENUM|Flags.COMPOUND)) == 0))
5544 log.error(env.tree.pos(), Errors.EnumNoSubclassing);
5545
5546 // Enums may not be extended by source-level classes
5547 if (st.tsym != null &&
5548 ((st.tsym.flags_field & Flags.ENUM) != 0) &&
5549 ((c.flags_field & (Flags.ENUM | Flags.COMPOUND)) == 0)) {
5550 log.error(env.tree.pos(), Errors.EnumTypesNotExtensible);
5551 }
5552
5553 if (rs.isSerializable(c.type)) {
5554 env.info.isSerializable = true;
5555 }
5556
5557 if (c.isValueClass()) {
5558 Assert.check(env.tree.hasTag(CLASSDEF));
5559 chk.checkConstraintsOfValueClass(env.tree.pos(), c);
5560 }
5561
5562 attribClassBody(env, c);
5563
5564 chk.checkDeprecatedAnnotation(env.tree.pos(), c);
5565 chk.checkClassOverrideEqualsAndHashIfNeeded(env.tree.pos(), c);
5566 chk.checkFunctionalInterface((JCClassDecl) env.tree, c);
5567 chk.checkLeaksNotAccessible(env, (JCClassDecl) env.tree);
5568 } finally {
5569 env.info.returnResult = prevReturnRes;
5570 log.useSource(prev);
5571 chk.setLint(prevLint);
5572 }
5573
5574 }
5575 }
5576
5577 public void visitImport(JCImport tree) {
5578 // nothing to do
5579 }
5580
5581 public void visitModuleDef(JCModuleDecl tree) {
5582 tree.sym.completeUsesProvides();
5583 ModuleSymbol msym = tree.sym;
5584 Lint lint = env.outer.info.lint = env.outer.info.lint.augment(msym);
5585 Lint prevLint = chk.setLint(lint);
5586 chk.checkModuleName(tree);
5587 chk.checkDeprecatedAnnotation(tree, msym);
5588
5589 try {
5590 deferredLintHandler.flush(tree.pos());
5591 } finally {
5592 chk.setLint(prevLint);
5593 }
5594 }
5595
5596 /** Finish the attribution of a class. */
5597 private void attribClassBody(Env<AttrContext> env, ClassSymbol c) {
5598 JCClassDecl tree = (JCClassDecl)env.tree;
5599 Assert.check(c == tree.sym);
5600
5601 // Validate type parameters, supertype and interfaces.
5602 attribStats(tree.typarams, env);
5603 if (!c.isAnonymous()) {
5604 //already checked if anonymous
5605 chk.validate(tree.typarams, env);
5606 chk.validate(tree.extending, env);
5607 chk.validate(tree.implementing, env);
5608 }
5609
5610 c.markAbstractIfNeeded(types);
5611
5612 // If this is a non-abstract class, check that it has no abstract
5613 // methods or unimplemented methods of an implemented interface.
5614 if ((c.flags() & (ABSTRACT | INTERFACE)) == 0) {
5615 chk.checkAllDefined(tree.pos(), c);
5616 }
5617
5618 if ((c.flags() & ANNOTATION) != 0) {
5619 if (tree.implementing.nonEmpty())
5620 log.error(tree.implementing.head.pos(),
5621 Errors.CantExtendIntfAnnotation);
5622 if (tree.typarams.nonEmpty()) {
5623 log.error(tree.typarams.head.pos(),
5624 Errors.IntfAnnotationCantHaveTypeParams(c));
5625 }
5626
5627 // If this annotation type has a @Repeatable, validate
5628 Attribute.Compound repeatable = c.getAnnotationTypeMetadata().getRepeatable();
5629 // If this annotation type has a @Repeatable, validate
5630 if (repeatable != null) {
5631 // get diagnostic position for error reporting
5632 DiagnosticPosition cbPos = getDiagnosticPosition(tree, repeatable.type);
5633 Assert.checkNonNull(cbPos);
5634
5635 chk.validateRepeatable(c, repeatable, cbPos);
5636 }
5637 } else {
5638 // Check that all extended classes and interfaces
5639 // are compatible (i.e. no two define methods with same arguments
5640 // yet different return types). (JLS 8.4.8.3)
5641 chk.checkCompatibleSupertypes(tree.pos(), c.type);
5642 chk.checkDefaultMethodClashes(tree.pos(), c.type);
5643 }
5644
5645 // Check that class does not import the same parameterized interface
5646 // with two different argument lists.
5647 chk.checkClassBounds(tree.pos(), c.type);
5648
5649 tree.type = c.type;
5650
5651 for (List<JCTypeParameter> l = tree.typarams;
5652 l.nonEmpty(); l = l.tail) {
5653 Assert.checkNonNull(env.info.scope.findFirst(l.head.name));
5654 }
5655
5656 // Check that a generic class doesn't extend Throwable
5657 if (!c.type.allparams().isEmpty() && types.isSubtype(c.type, syms.throwableType))
5658 log.error(tree.extending.pos(), Errors.GenericThrowable);
5659
5660 // Check that all methods which implement some
5661 // method conform to the method they implement.
5662 chk.checkImplementations(tree);
5663
5664 //check that a resource implementing AutoCloseable cannot throw InterruptedException
5665 checkAutoCloseable(tree.pos(), env, c.type);
5666
5667 for (List<JCTree> l = tree.defs; l.nonEmpty(); l = l.tail) {
5668 // Attribute declaration
5669 attribStat(l.head, env);
5670 // Check that declarations in inner classes are not static (JLS 8.1.2)
5671 // Make an exception for static constants.
5672 if (!allowRecords &&
5673 c.owner.kind != PCK &&
5674 ((c.flags() & STATIC) == 0 || c.name == names.empty) &&
5675 (TreeInfo.flags(l.head) & (STATIC | INTERFACE)) != 0) {
5676 VarSymbol sym = null;
5677 if (l.head.hasTag(VARDEF)) sym = ((JCVariableDecl) l.head).sym;
5678 if (sym == null ||
5679 sym.kind != VAR ||
5680 sym.getConstValue() == null)
5681 log.error(l.head.pos(), Errors.IclsCantHaveStaticDecl(c));
5682 }
5683 }
5684
5685 // Check for cycles among non-initial constructors.
5686 chk.checkCyclicConstructors(tree);
5687
5688 // Check for cycles among annotation elements.
5689 chk.checkNonCyclicElements(tree);
5690
5691 // Check for proper use of serialVersionUID and other
5692 // serialization-related fields and methods
5693 if (env.info.lint.isEnabled(LintCategory.SERIAL)
5694 && rs.isSerializable(c.type)
5695 && !c.isAnonymous()) {
5696 chk.checkSerialStructure(tree, c);
5697 }
5698 // Correctly organize the positions of the type annotations
5699 typeAnnotations.organizeTypeAnnotationsBodies(tree);
5700
5701 // Check type annotations applicability rules
5702 validateTypeAnnotations(tree, false);
5703 }
5704 // where
5705 /** get a diagnostic position for an attribute of Type t, or null if attribute missing */
5706 private DiagnosticPosition getDiagnosticPosition(JCClassDecl tree, Type t) {
5707 for(List<JCAnnotation> al = tree.mods.annotations; !al.isEmpty(); al = al.tail) {
5708 if (types.isSameType(al.head.annotationType.type, t))
5709 return al.head.pos();
5710 }
5711
5712 return null;
5713 }
5714
5715 private Type capture(Type type) {
5716 return types.capture(type);
5717 }
5718
5719 private void setSyntheticVariableType(JCVariableDecl tree, Type type) {
5720 if (type.isErroneous()) {
5721 tree.vartype = make.at(Position.NOPOS).Erroneous();
5722 } else {
5723 tree.vartype = make.at(Position.NOPOS).Type(type);
5724 }
5725 }
5726
5727 public void validateTypeAnnotations(JCTree tree, boolean sigOnly) {
5728 tree.accept(new TypeAnnotationsValidator(sigOnly));
5729 }
5730 //where
5731 private final class TypeAnnotationsValidator extends TreeScanner {
5732
5733 private final boolean sigOnly;
5734 public TypeAnnotationsValidator(boolean sigOnly) {
5735 this.sigOnly = sigOnly;
5736 }
5737
5738 public void visitAnnotation(JCAnnotation tree) {
5739 chk.validateTypeAnnotation(tree, false);
5740 super.visitAnnotation(tree);
5741 }
5742 public void visitAnnotatedType(JCAnnotatedType tree) {
5743 if (!tree.underlyingType.type.isErroneous()) {
5744 super.visitAnnotatedType(tree);
5745 }
5746 }
5747 public void visitTypeParameter(JCTypeParameter tree) {
5748 chk.validateTypeAnnotations(tree.annotations, true);
5749 scan(tree.bounds);
5750 // Don't call super.
5751 // This is needed because above we call validateTypeAnnotation with
5752 // false, which would forbid annotations on type parameters.
5753 // super.visitTypeParameter(tree);
5754 }
5755 public void visitMethodDef(JCMethodDecl tree) {
5756 if (tree.recvparam != null &&
5757 !tree.recvparam.vartype.type.isErroneous()) {
5758 checkForDeclarationAnnotations(tree.recvparam.mods.annotations, tree.recvparam.sym);
5759 }
5760 if (tree.restype != null && tree.restype.type != null) {
5761 validateAnnotatedType(tree.restype, tree.restype.type);
5762 }
5763 if (sigOnly) {
5764 scan(tree.mods);
5765 scan(tree.restype);
5766 scan(tree.typarams);
5767 scan(tree.recvparam);
5768 scan(tree.params);
5769 scan(tree.thrown);
5770 } else {
5771 scan(tree.defaultValue);
5772 scan(tree.body);
5773 }
5774 }
5775 public void visitVarDef(final JCVariableDecl tree) {
5776 //System.err.println("validateTypeAnnotations.visitVarDef " + tree);
5777 if (tree.sym != null && tree.sym.type != null && !tree.isImplicitlyTyped())
5778 validateAnnotatedType(tree.vartype, tree.sym.type);
5779 scan(tree.mods);
5780 scan(tree.vartype);
5781 if (!sigOnly) {
5782 scan(tree.init);
5783 }
5784 }
5785 public void visitTypeCast(JCTypeCast tree) {
5786 if (tree.clazz != null && tree.clazz.type != null)
5787 validateAnnotatedType(tree.clazz, tree.clazz.type);
5788 super.visitTypeCast(tree);
5789 }
5790 public void visitTypeTest(JCInstanceOf tree) {
5791 if (tree.pattern != null && !(tree.pattern instanceof JCPattern) && tree.pattern.type != null)
5792 validateAnnotatedType(tree.pattern, tree.pattern.type);
5793 super.visitTypeTest(tree);
5794 }
5795 public void visitNewClass(JCNewClass tree) {
5796 if (tree.clazz != null && tree.clazz.type != null) {
5797 if (tree.clazz.hasTag(ANNOTATED_TYPE)) {
5798 checkForDeclarationAnnotations(((JCAnnotatedType) tree.clazz).annotations,
5799 tree.clazz.type.tsym);
5800 }
5801 if (tree.def != null) {
5802 checkForDeclarationAnnotations(tree.def.mods.annotations, tree.clazz.type.tsym);
5803 }
5804
5805 validateAnnotatedType(tree.clazz, tree.clazz.type);
5806 }
5807 super.visitNewClass(tree);
5808 }
5809 public void visitNewArray(JCNewArray tree) {
5810 if (tree.elemtype != null && tree.elemtype.type != null) {
5811 if (tree.elemtype.hasTag(ANNOTATED_TYPE)) {
5812 checkForDeclarationAnnotations(((JCAnnotatedType) tree.elemtype).annotations,
5813 tree.elemtype.type.tsym);
5814 }
5815 validateAnnotatedType(tree.elemtype, tree.elemtype.type);
5816 }
5817 super.visitNewArray(tree);
5818 }
5819 public void visitClassDef(JCClassDecl tree) {
5820 //System.err.println("validateTypeAnnotations.visitClassDef " + tree);
5821 if (sigOnly) {
5822 scan(tree.mods);
5823 scan(tree.typarams);
5824 scan(tree.extending);
5825 scan(tree.implementing);
5826 }
5827 for (JCTree member : tree.defs) {
5828 if (member.hasTag(Tag.CLASSDEF)) {
5829 continue;
5830 }
5831 scan(member);
5832 }
5833 }
5834 public void visitBlock(JCBlock tree) {
5835 if (!sigOnly) {
5836 scan(tree.stats);
5837 }
5838 }
5839
5840 /* I would want to model this after
5841 * com.sun.tools.javac.comp.Check.Validator.visitSelectInternal(JCFieldAccess)
5842 * and override visitSelect and visitTypeApply.
5843 * However, we only set the annotated type in the top-level type
5844 * of the symbol.
5845 * Therefore, we need to override each individual location where a type
5846 * can occur.
5847 */
5848 private void validateAnnotatedType(final JCTree errtree, final Type type) {
5849 //System.err.println("Attr.validateAnnotatedType: " + errtree + " type: " + type);
5850
5851 if (type.isPrimitiveOrVoid()) {
5852 return;
5853 }
5854
5855 JCTree enclTr = errtree;
5856 Type enclTy = type;
5857
5858 boolean repeat = true;
5859 while (repeat) {
5860 if (enclTr.hasTag(TYPEAPPLY)) {
5861 List<Type> tyargs = enclTy.getTypeArguments();
5862 List<JCExpression> trargs = ((JCTypeApply)enclTr).getTypeArguments();
5863 if (trargs.length() > 0) {
5864 // Nothing to do for diamonds
5865 if (tyargs.length() == trargs.length()) {
5866 for (int i = 0; i < tyargs.length(); ++i) {
5867 validateAnnotatedType(trargs.get(i), tyargs.get(i));
5868 }
5869 }
5870 // If the lengths don't match, it's either a diamond
5871 // or some nested type that redundantly provides
5872 // type arguments in the tree.
5873 }
5874
5875 // Look at the clazz part of a generic type
5876 enclTr = ((JCTree.JCTypeApply)enclTr).clazz;
5877 }
5878
5879 if (enclTr.hasTag(SELECT)) {
5880 enclTr = ((JCTree.JCFieldAccess)enclTr).getExpression();
5881 if (enclTy != null &&
5882 !enclTy.hasTag(NONE)) {
5883 enclTy = enclTy.getEnclosingType();
5884 }
5885 } else if (enclTr.hasTag(ANNOTATED_TYPE)) {
5886 JCAnnotatedType at = (JCTree.JCAnnotatedType) enclTr;
5887 if (enclTy == null || enclTy.hasTag(NONE)) {
5888 if (at.getAnnotations().size() == 1) {
5889 log.error(at.underlyingType.pos(), Errors.CantTypeAnnotateScoping1(at.getAnnotations().head.attribute));
5890 } else {
5891 ListBuffer<Attribute.Compound> comps = new ListBuffer<>();
5892 for (JCAnnotation an : at.getAnnotations()) {
5893 comps.add(an.attribute);
5894 }
5895 log.error(at.underlyingType.pos(), Errors.CantTypeAnnotateScoping(comps.toList()));
5896 }
5897 repeat = false;
5898 }
5899 enclTr = at.underlyingType;
5900 // enclTy doesn't need to be changed
5901 } else if (enclTr.hasTag(IDENT)) {
5902 repeat = false;
5903 } else if (enclTr.hasTag(JCTree.Tag.WILDCARD)) {
5904 JCWildcard wc = (JCWildcard) enclTr;
5905 if (wc.getKind() == JCTree.Kind.EXTENDS_WILDCARD ||
5906 wc.getKind() == JCTree.Kind.SUPER_WILDCARD) {
5907 validateAnnotatedType(wc.getBound(), wc.getBound().type);
5908 } else {
5909 // Nothing to do for UNBOUND
5910 }
5911 repeat = false;
5912 } else if (enclTr.hasTag(TYPEARRAY)) {
5913 JCArrayTypeTree art = (JCArrayTypeTree) enclTr;
5914 validateAnnotatedType(art.getType(), art.elemtype.type);
5915 repeat = false;
5916 } else if (enclTr.hasTag(TYPEUNION)) {
5917 JCTypeUnion ut = (JCTypeUnion) enclTr;
5918 for (JCTree t : ut.getTypeAlternatives()) {
5919 validateAnnotatedType(t, t.type);
5920 }
5921 repeat = false;
5922 } else if (enclTr.hasTag(TYPEINTERSECTION)) {
5923 JCTypeIntersection it = (JCTypeIntersection) enclTr;
5924 for (JCTree t : it.getBounds()) {
5925 validateAnnotatedType(t, t.type);
5926 }
5927 repeat = false;
5928 } else if (enclTr.getKind() == JCTree.Kind.PRIMITIVE_TYPE ||
5929 enclTr.getKind() == JCTree.Kind.ERRONEOUS) {
5930 repeat = false;
5931 } else {
5932 Assert.error("Unexpected tree: " + enclTr + " with kind: " + enclTr.getKind() +
5933 " within: "+ errtree + " with kind: " + errtree.getKind());
5934 }
5935 }
5936 }
5937
5938 private void checkForDeclarationAnnotations(List<? extends JCAnnotation> annotations,
5939 Symbol sym) {
5940 // Ensure that no declaration annotations are present.
5941 // Note that a tree type might be an AnnotatedType with
5942 // empty annotations, if only declaration annotations were given.
5943 // This method will raise an error for such a type.
5944 for (JCAnnotation ai : annotations) {
5945 if (!ai.type.isErroneous() &&
5946 typeAnnotations.annotationTargetType(ai.attribute, sym) == TypeAnnotations.AnnotationType.DECLARATION) {
5947 log.error(ai.pos(), Errors.AnnotationTypeNotApplicableToType(ai.type));
5948 }
5949 }
5950 }
5951 }
5952
5953 // <editor-fold desc="post-attribution visitor">
5954
5955 /**
5956 * Handle missing types/symbols in an AST. This routine is useful when
5957 * the compiler has encountered some errors (which might have ended up
5958 * terminating attribution abruptly); if the compiler is used in fail-over
5959 * mode (e.g. by an IDE) and the AST contains semantic errors, this routine
5960 * prevents NPE to be propagated during subsequent compilation steps.
5961 */
5962 public void postAttr(JCTree tree) {
5963 new PostAttrAnalyzer().scan(tree);
5964 }
5965
5966 class PostAttrAnalyzer extends TreeScanner {
5967
5968 private void initTypeIfNeeded(JCTree that) {
5969 if (that.type == null) {
5970 if (that.hasTag(METHODDEF)) {
5971 that.type = dummyMethodType((JCMethodDecl)that);
5972 } else {
5973 that.type = syms.unknownType;
5974 }
5975 }
5976 }
5977
5978 /* Construct a dummy method type. If we have a method declaration,
5979 * and the declared return type is void, then use that return type
5980 * instead of UNKNOWN to avoid spurious error messages in lambda
5981 * bodies (see:JDK-8041704).
5982 */
5983 private Type dummyMethodType(JCMethodDecl md) {
5984 Type restype = syms.unknownType;
5985 if (md != null && md.restype != null && md.restype.hasTag(TYPEIDENT)) {
5986 JCPrimitiveTypeTree prim = (JCPrimitiveTypeTree)md.restype;
5987 if (prim.typetag == VOID)
5988 restype = syms.voidType;
5989 }
5990 return new MethodType(List.nil(), restype,
5991 List.nil(), syms.methodClass);
5992 }
5993 private Type dummyMethodType() {
5994 return dummyMethodType(null);
5995 }
5996
5997 @Override
5998 public void scan(JCTree tree) {
5999 if (tree == null) return;
6000 if (tree instanceof JCExpression) {
6001 initTypeIfNeeded(tree);
6002 }
6003 super.scan(tree);
6004 }
6005
6006 @Override
6007 public void visitIdent(JCIdent that) {
6008 if (that.sym == null) {
6009 that.sym = syms.unknownSymbol;
6010 }
6011 }
6012
6013 @Override
6014 public void visitSelect(JCFieldAccess that) {
6015 if (that.sym == null) {
6016 that.sym = syms.unknownSymbol;
6017 }
6018 super.visitSelect(that);
6019 }
6020
6021 @Override
6022 public void visitClassDef(JCClassDecl that) {
6023 initTypeIfNeeded(that);
6024 if (that.sym == null) {
6025 that.sym = new ClassSymbol(0, that.name, that.type, syms.noSymbol);
6026 }
6027 super.visitClassDef(that);
6028 }
6029
6030 @Override
6031 public void visitMethodDef(JCMethodDecl that) {
6032 initTypeIfNeeded(that);
6033 if (that.sym == null) {
6034 that.sym = new MethodSymbol(0, that.name, that.type, syms.noSymbol);
6035 }
6036 super.visitMethodDef(that);
6037 }
6038
6039 @Override
6040 public void visitVarDef(JCVariableDecl that) {
6041 initTypeIfNeeded(that);
6042 if (that.sym == null) {
6043 that.sym = new VarSymbol(0, that.name, that.type, syms.noSymbol);
6044 that.sym.adr = 0;
6045 }
6046 if (that.vartype == null) {
6047 that.vartype = make.at(Position.NOPOS).Erroneous();
6048 }
6049 super.visitVarDef(that);
6050 }
6051
6052 @Override
6053 public void visitBindingPattern(JCBindingPattern that) {
6054 initTypeIfNeeded(that);
6055 initTypeIfNeeded(that.var);
6056 if (that.var.sym == null) {
6057 that.var.sym = new BindingSymbol(0, that.var.name, that.var.type, syms.noSymbol);
6058 that.var.sym.adr = 0;
6059 }
6060 super.visitBindingPattern(that);
6061 }
6062
6063 @Override
6064 public void visitNewClass(JCNewClass that) {
6065 if (that.constructor == null) {
6066 that.constructor = new MethodSymbol(0, names.init,
6067 dummyMethodType(), syms.noSymbol);
6068 }
6069 if (that.constructorType == null) {
6070 that.constructorType = syms.unknownType;
6071 }
6072 super.visitNewClass(that);
6073 }
6074
6075 @Override
6076 public void visitAssignop(JCAssignOp that) {
6077 if (that.operator == null) {
6078 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6079 -1, syms.noSymbol);
6080 }
6081 super.visitAssignop(that);
6082 }
6083
6084 @Override
6085 public void visitBinary(JCBinary that) {
6086 if (that.operator == null) {
6087 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6088 -1, syms.noSymbol);
6089 }
6090 super.visitBinary(that);
6091 }
6092
6093 @Override
6094 public void visitUnary(JCUnary that) {
6095 if (that.operator == null) {
6096 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6097 -1, syms.noSymbol);
6098 }
6099 super.visitUnary(that);
6100 }
6101
6102 @Override
6103 public void visitReference(JCMemberReference that) {
6104 super.visitReference(that);
6105 if (that.sym == null) {
6106 that.sym = new MethodSymbol(0, names.empty, dummyMethodType(),
6107 syms.noSymbol);
6108 }
6109 }
6110 }
6111 // </editor-fold>
6112
6113 public void setPackageSymbols(JCExpression pid, Symbol pkg) {
6114 new TreeScanner() {
6115 Symbol packge = pkg;
6116 @Override
6117 public void visitIdent(JCIdent that) {
6118 that.sym = packge;
6119 }
6120
6121 @Override
6122 public void visitSelect(JCFieldAccess that) {
6123 that.sym = packge;
6124 packge = packge.owner;
6125 super.visitSelect(that);
6126 }
6127 }.scan(pid);
6128 }
6129
6130 }