1 /*
2 * Copyright (c) 1999, 2025, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package com.sun.tools.javac.comp;
27
28 import java.util.*;
29 import java.util.function.BiConsumer;
30 import java.util.function.Consumer;
31 import java.util.function.Function;
32 import java.util.stream.Stream;
33
34 import javax.lang.model.element.ElementKind;
35 import javax.tools.JavaFileObject;
36
37 import com.sun.source.tree.CaseTree;
38 import com.sun.source.tree.IdentifierTree;
39 import com.sun.source.tree.LambdaExpressionTree.BodyKind;
40 import com.sun.source.tree.MemberReferenceTree.ReferenceMode;
41 import com.sun.source.tree.MemberSelectTree;
42 import com.sun.source.tree.TreeVisitor;
43 import com.sun.source.util.SimpleTreeVisitor;
44 import com.sun.tools.javac.code.*;
45 import com.sun.tools.javac.code.Lint.LintCategory;
46 import com.sun.tools.javac.code.Scope.WriteableScope;
47 import com.sun.tools.javac.code.Source.Feature;
48 import com.sun.tools.javac.code.Symbol.*;
49 import com.sun.tools.javac.code.Type.*;
50 import com.sun.tools.javac.code.Types.FunctionDescriptorLookupError;
51 import com.sun.tools.javac.comp.ArgumentAttr.LocalCacheContext;
52 import com.sun.tools.javac.comp.Attr.ResultInfo;
53 import com.sun.tools.javac.comp.Check.CheckContext;
54 import com.sun.tools.javac.comp.Check.NestedCheckContext;
55 import com.sun.tools.javac.comp.DeferredAttr.AttrMode;
56 import com.sun.tools.javac.comp.DeferredAttr.LambdaReturnScanner;
57 import com.sun.tools.javac.comp.MatchBindingsComputer.MatchBindings;
58 import com.sun.tools.javac.jvm.*;
59
60 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.Diamond;
61 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.DiamondInvalidArg;
62 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.DiamondInvalidArgs;
63
64 import com.sun.tools.javac.resources.CompilerProperties.Errors;
65 import com.sun.tools.javac.resources.CompilerProperties.Fragments;
66 import com.sun.tools.javac.resources.CompilerProperties.LintWarnings;
67 import com.sun.tools.javac.resources.CompilerProperties.Warnings;
68 import com.sun.tools.javac.tree.*;
69 import com.sun.tools.javac.tree.JCTree.*;
70 import com.sun.tools.javac.tree.JCTree.JCLambda.ParameterKind;
71 import com.sun.tools.javac.tree.JCTree.JCPolyExpression.*;
72 import com.sun.tools.javac.util.*;
73 import com.sun.tools.javac.util.DefinedBy.Api;
74 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
75 import com.sun.tools.javac.util.JCDiagnostic.Error;
76 import com.sun.tools.javac.util.JCDiagnostic.Fragment;
77 import com.sun.tools.javac.util.JCDiagnostic.Warning;
78 import com.sun.tools.javac.util.List;
79
80 import static com.sun.tools.javac.code.Flags.*;
81 import static com.sun.tools.javac.code.Flags.ANNOTATION;
82 import static com.sun.tools.javac.code.Flags.BLOCK;
83 import static com.sun.tools.javac.code.Kinds.*;
84 import static com.sun.tools.javac.code.Kinds.Kind.*;
85 import static com.sun.tools.javac.code.TypeTag.*;
86 import static com.sun.tools.javac.code.TypeTag.WILDCARD;
87 import static com.sun.tools.javac.tree.JCTree.Tag.*;
88 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticFlag;
89
90 /** This is the main context-dependent analysis phase in GJC. It
91 * encompasses name resolution, type checking and constant folding as
92 * subtasks. Some subtasks involve auxiliary classes.
93 * @see Check
94 * @see Resolve
95 * @see ConstFold
96 * @see Infer
97 *
98 * <p><b>This is NOT part of any supported API.
99 * If you write code that depends on this, you do so at your own risk.
100 * This code and its internal interfaces are subject to change or
101 * deletion without notice.</b>
102 */
103 public class Attr extends JCTree.Visitor {
104 protected static final Context.Key<Attr> attrKey = new Context.Key<>();
105
106 final Names names;
107 final Log log;
108 final Symtab syms;
109 final Resolve rs;
110 final Operators operators;
111 final Infer infer;
112 final Analyzer analyzer;
113 final DeferredAttr deferredAttr;
114 final Check chk;
115 final Flow flow;
116 final MemberEnter memberEnter;
117 final TypeEnter typeEnter;
118 final TreeMaker make;
119 final ConstFold cfolder;
120 final Enter enter;
121 final Target target;
122 final Types types;
123 final Preview preview;
124 final JCDiagnostic.Factory diags;
125 final TypeAnnotations typeAnnotations;
126 final DeferredLintHandler deferredLintHandler;
127 final TypeEnvs typeEnvs;
128 final Dependencies dependencies;
129 final Annotate annotate;
130 final ArgumentAttr argumentAttr;
131 final MatchBindingsComputer matchBindingsComputer;
132 final AttrRecover attrRecover;
133
134 public static Attr instance(Context context) {
135 Attr instance = context.get(attrKey);
136 if (instance == null)
137 instance = new Attr(context);
138 return instance;
139 }
140
141 @SuppressWarnings("this-escape")
142 protected Attr(Context context) {
143 context.put(attrKey, this);
144
145 names = Names.instance(context);
146 log = Log.instance(context);
147 syms = Symtab.instance(context);
148 rs = Resolve.instance(context);
149 operators = Operators.instance(context);
150 chk = Check.instance(context);
151 flow = Flow.instance(context);
152 memberEnter = MemberEnter.instance(context);
153 typeEnter = TypeEnter.instance(context);
154 make = TreeMaker.instance(context);
155 enter = Enter.instance(context);
156 infer = Infer.instance(context);
157 analyzer = Analyzer.instance(context);
158 deferredAttr = DeferredAttr.instance(context);
159 cfolder = ConstFold.instance(context);
160 target = Target.instance(context);
161 types = Types.instance(context);
162 preview = Preview.instance(context);
163 diags = JCDiagnostic.Factory.instance(context);
164 annotate = Annotate.instance(context);
165 typeAnnotations = TypeAnnotations.instance(context);
166 deferredLintHandler = DeferredLintHandler.instance(context);
167 typeEnvs = TypeEnvs.instance(context);
168 dependencies = Dependencies.instance(context);
169 argumentAttr = ArgumentAttr.instance(context);
170 matchBindingsComputer = MatchBindingsComputer.instance(context);
171 attrRecover = AttrRecover.instance(context);
172
173 Options options = Options.instance(context);
174
175 Source source = Source.instance(context);
176 allowReifiableTypesInInstanceof = Feature.REIFIABLE_TYPES_INSTANCEOF.allowedInSource(source);
177 allowRecords = Feature.RECORDS.allowedInSource(source);
178 allowPatternSwitch = (preview.isEnabled() || !preview.isPreview(Feature.PATTERN_SWITCH)) &&
179 Feature.PATTERN_SWITCH.allowedInSource(source);
180 allowUnconditionalPatternsInstanceOf =
181 Feature.UNCONDITIONAL_PATTERN_IN_INSTANCEOF.allowedInSource(source);
182 sourceName = source.name;
183 useBeforeDeclarationWarning = options.isSet("useBeforeDeclarationWarning");
184
185 statInfo = new ResultInfo(KindSelector.NIL, Type.noType);
186 varAssignmentInfo = new ResultInfo(KindSelector.ASG, Type.noType);
187 unknownExprInfo = new ResultInfo(KindSelector.VAL, Type.noType);
188 methodAttrInfo = new MethodAttrInfo();
189 unknownTypeInfo = new ResultInfo(KindSelector.TYP, Type.noType);
190 unknownTypeExprInfo = new ResultInfo(KindSelector.VAL_TYP, Type.noType);
191 recoveryInfo = new RecoveryInfo(deferredAttr.emptyDeferredAttrContext);
192 initBlockType = new MethodType(List.nil(), syms.voidType, List.nil(), syms.methodClass);
193 }
194
195 /** Switch: reifiable types in instanceof enabled?
196 */
197 boolean allowReifiableTypesInInstanceof;
198
199 /** Are records allowed
200 */
201 private final boolean allowRecords;
202
203 /** Are patterns in switch allowed
204 */
205 private final boolean allowPatternSwitch;
206
207 /** Are unconditional patterns in instanceof allowed
208 */
209 private final boolean allowUnconditionalPatternsInstanceOf;
210
211 /**
212 * Switch: warn about use of variable before declaration?
213 * RFE: 6425594
214 */
215 boolean useBeforeDeclarationWarning;
216
217 /**
218 * Switch: name of source level; used for error reporting.
219 */
220 String sourceName;
221
222 /** Check kind and type of given tree against protokind and prototype.
223 * If check succeeds, store type in tree and return it.
224 * If check fails, store errType in tree and return it.
225 * No checks are performed if the prototype is a method type.
226 * It is not necessary in this case since we know that kind and type
227 * are correct.
228 *
229 * @param tree The tree whose kind and type is checked
230 * @param found The computed type of the tree
231 * @param ownkind The computed kind of the tree
232 * @param resultInfo The expected result of the tree
233 */
234 Type check(final JCTree tree,
235 final Type found,
236 final KindSelector ownkind,
237 final ResultInfo resultInfo) {
238 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
239 Type owntype;
240 boolean shouldCheck = !found.hasTag(ERROR) &&
241 !resultInfo.pt.hasTag(METHOD) &&
242 !resultInfo.pt.hasTag(FORALL);
243 if (shouldCheck && !ownkind.subset(resultInfo.pkind)) {
244 log.error(tree.pos(),
245 Errors.UnexpectedType(resultInfo.pkind.kindNames(),
246 ownkind.kindNames()));
247 owntype = types.createErrorType(found);
248 } else if (inferenceContext.free(found)) {
249 //delay the check if there are inference variables in the found type
250 //this means we are dealing with a partially inferred poly expression
251 owntype = shouldCheck ? resultInfo.pt : found;
252 if (resultInfo.checkMode.installPostInferenceHook()) {
253 inferenceContext.addFreeTypeListener(List.of(found),
254 instantiatedContext -> {
255 ResultInfo pendingResult =
256 resultInfo.dup(inferenceContext.asInstType(resultInfo.pt));
257 check(tree, inferenceContext.asInstType(found), ownkind, pendingResult);
258 });
259 }
260 } else {
261 owntype = shouldCheck ?
262 resultInfo.check(tree, found) :
263 found;
264 }
265 if (resultInfo.checkMode.updateTreeType()) {
266 tree.type = owntype;
267 }
268 return owntype;
269 }
270
271 /** Is given blank final variable assignable, i.e. in a scope where it
272 * may be assigned to even though it is final?
273 * @param v The blank final variable.
274 * @param env The current environment.
275 */
276 boolean isAssignableAsBlankFinal(VarSymbol v, Env<AttrContext> env) {
277 Symbol owner = env.info.scope.owner;
278 // owner refers to the innermost variable, method or
279 // initializer block declaration at this point.
280 boolean isAssignable =
281 v.owner == owner
282 ||
283 ((owner.name == names.init || // i.e. we are in a constructor
284 owner.kind == VAR || // i.e. we are in a variable initializer
285 (owner.flags() & BLOCK) != 0) // i.e. we are in an initializer block
286 &&
287 v.owner == owner.owner
288 &&
289 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env));
290 boolean insideCompactConstructor = env.enclMethod != null && TreeInfo.isCompactConstructor(env.enclMethod);
291 return isAssignable & !insideCompactConstructor;
292 }
293
294 /** Check that variable can be assigned to.
295 * @param pos The current source code position.
296 * @param v The assigned variable
297 * @param base If the variable is referred to in a Select, the part
298 * to the left of the `.', null otherwise.
299 * @param env The current environment.
300 */
301 void checkAssignable(DiagnosticPosition pos, VarSymbol v, JCTree base, Env<AttrContext> env) {
302 if (v.name == names._this) {
303 log.error(pos, Errors.CantAssignValToThis);
304 return;
305 }
306 if ((v.flags() & FINAL) != 0 &&
307 ((v.flags() & HASINIT) != 0
308 ||
309 !((base == null ||
310 TreeInfo.isThisQualifier(base)) &&
311 isAssignableAsBlankFinal(v, env)))) {
312 if (v.isResourceVariable()) { //TWR resource
313 log.error(pos, Errors.TryResourceMayNotBeAssigned(v));
314 } else {
315 log.error(pos, Errors.CantAssignValToVar(Flags.toSource(v.flags() & (STATIC | FINAL)), v));
316 }
317 return;
318 }
319
320 // Check instance field assignments that appear in constructor prologues
321 if (rs.isEarlyReference(env, base, v)) {
322
323 // Field may not be inherited from a superclass
324 if (v.owner != env.enclClass.sym) {
325 log.error(pos, Errors.CantRefBeforeCtorCalled(v));
326 return;
327 }
328
329 // Field may not have an initializer
330 if ((v.flags() & HASINIT) != 0) {
331 log.error(pos, Errors.CantAssignInitializedBeforeCtorCalled(v));
332 return;
333 }
334 }
335 }
336
337 /** Does tree represent a static reference to an identifier?
338 * It is assumed that tree is either a SELECT or an IDENT.
339 * We have to weed out selects from non-type names here.
340 * @param tree The candidate tree.
341 */
342 boolean isStaticReference(JCTree tree) {
343 if (tree.hasTag(SELECT)) {
344 Symbol lsym = TreeInfo.symbol(((JCFieldAccess) tree).selected);
345 if (lsym == null || lsym.kind != TYP) {
346 return false;
347 }
348 }
349 return true;
350 }
351
352 /** Is this symbol a type?
353 */
354 static boolean isType(Symbol sym) {
355 return sym != null && sym.kind == TYP;
356 }
357
358 /** Attribute a parsed identifier.
359 * @param tree Parsed identifier name
360 * @param topLevel The toplevel to use
361 */
362 public Symbol attribIdent(JCTree tree, JCCompilationUnit topLevel) {
363 Env<AttrContext> localEnv = enter.topLevelEnv(topLevel);
364 localEnv.enclClass = make.ClassDef(make.Modifiers(0),
365 syms.errSymbol.name,
366 null, null, null, null);
367 localEnv.enclClass.sym = syms.errSymbol;
368 return attribIdent(tree, localEnv);
369 }
370
371 /** Attribute a parsed identifier.
372 * @param tree Parsed identifier name
373 * @param env The env to use
374 */
375 public Symbol attribIdent(JCTree tree, Env<AttrContext> env) {
376 return tree.accept(identAttributer, env);
377 }
378 // where
379 private TreeVisitor<Symbol,Env<AttrContext>> identAttributer = new IdentAttributer();
380 private class IdentAttributer extends SimpleTreeVisitor<Symbol,Env<AttrContext>> {
381 @Override @DefinedBy(Api.COMPILER_TREE)
382 public Symbol visitMemberSelect(MemberSelectTree node, Env<AttrContext> env) {
383 Symbol site = visit(node.getExpression(), env);
384 if (site.kind == ERR || site.kind == ABSENT_TYP || site.kind == HIDDEN)
385 return site;
386 Name name = (Name)node.getIdentifier();
387 if (site.kind == PCK) {
388 env.toplevel.packge = (PackageSymbol)site;
389 return rs.findIdentInPackage(null, env, (TypeSymbol)site, name,
390 KindSelector.TYP_PCK);
391 } else {
392 env.enclClass.sym = (ClassSymbol)site;
393 return rs.findMemberType(env, site.asType(), name, (TypeSymbol)site);
394 }
395 }
396
397 @Override @DefinedBy(Api.COMPILER_TREE)
398 public Symbol visitIdentifier(IdentifierTree node, Env<AttrContext> env) {
399 return rs.findIdent(null, env, (Name)node.getName(), KindSelector.TYP_PCK);
400 }
401 }
402
403 public Type coerce(Type etype, Type ttype) {
404 return cfolder.coerce(etype, ttype);
405 }
406
407 public Type attribType(JCTree node, TypeSymbol sym) {
408 Env<AttrContext> env = typeEnvs.get(sym);
409 Env<AttrContext> localEnv = env.dup(node, env.info.dup());
410 return attribTree(node, localEnv, unknownTypeInfo);
411 }
412
413 public Type attribImportQualifier(JCImport tree, Env<AttrContext> env) {
414 // Attribute qualifying package or class.
415 JCFieldAccess s = tree.qualid;
416 return attribTree(s.selected, env,
417 new ResultInfo(tree.staticImport ?
418 KindSelector.TYP : KindSelector.TYP_PCK,
419 Type.noType));
420 }
421
422 public Env<AttrContext> attribExprToTree(JCTree expr, Env<AttrContext> env, JCTree tree) {
423 return attribToTree(expr, env, tree, unknownExprInfo);
424 }
425
426 public Env<AttrContext> attribStatToTree(JCTree stmt, Env<AttrContext> env, JCTree tree) {
427 return attribToTree(stmt, env, tree, statInfo);
428 }
429
430 private Env<AttrContext> attribToTree(JCTree root, Env<AttrContext> env, JCTree tree, ResultInfo resultInfo) {
431 breakTree = tree;
432 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
433 try {
434 deferredAttr.attribSpeculative(root, env, resultInfo,
435 null, DeferredAttr.AttributionMode.ATTRIB_TO_TREE,
436 argumentAttr.withLocalCacheContext());
437 attrRecover.doRecovery();
438 } catch (BreakAttr b) {
439 return b.env;
440 } catch (AssertionError ae) {
441 if (ae.getCause() instanceof BreakAttr breakAttr) {
442 return breakAttr.env;
443 } else {
444 throw ae;
445 }
446 } finally {
447 breakTree = null;
448 log.useSource(prev);
449 }
450 return env;
451 }
452
453 public <R> R runWithAttributedMethod(Env<AttrContext> env, JCMethodDecl tree, Function<JCBlock, R> attributedAction) {
454 JavaFileObject prevSource = log.useSource(env.toplevel.sourcefile);
455 try {
456 JCBlock dupTree = (JCBlock)deferredAttr.attribSpeculative(tree.body, env, statInfo,
457 null, DeferredAttr.AttributionMode.ATTRIB_TO_TREE,
458 argumentAttr.withLocalCacheContext());
459 return attributedAction.apply(dupTree);
460 } finally {
461 attrRecover.doRecovery();
462 log.useSource(prevSource);
463 }
464 }
465
466 private JCTree breakTree = null;
467
468 private static class BreakAttr extends RuntimeException {
469 static final long serialVersionUID = -6924771130405446405L;
470 private transient Env<AttrContext> env;
471 private BreakAttr(Env<AttrContext> env) {
472 this.env = env;
473 }
474 }
475
476 /**
477 * Mode controlling behavior of Attr.Check
478 */
479 enum CheckMode {
480
481 NORMAL,
482
483 /**
484 * Mode signalling 'fake check' - skip tree update. A side-effect of this mode is
485 * that the captured var cache in {@code InferenceContext} will be used in read-only
486 * mode when performing inference checks.
487 */
488 NO_TREE_UPDATE {
489 @Override
490 public boolean updateTreeType() {
491 return false;
492 }
493 },
494 /**
495 * Mode signalling that caller will manage free types in tree decorations.
496 */
497 NO_INFERENCE_HOOK {
498 @Override
499 public boolean installPostInferenceHook() {
500 return false;
501 }
502 };
503
504 public boolean updateTreeType() {
505 return true;
506 }
507 public boolean installPostInferenceHook() {
508 return true;
509 }
510 }
511
512
513 class ResultInfo {
514 final KindSelector pkind;
515 final Type pt;
516 final CheckContext checkContext;
517 final CheckMode checkMode;
518
519 ResultInfo(KindSelector pkind, Type pt) {
520 this(pkind, pt, chk.basicHandler, CheckMode.NORMAL);
521 }
522
523 ResultInfo(KindSelector pkind, Type pt, CheckMode checkMode) {
524 this(pkind, pt, chk.basicHandler, checkMode);
525 }
526
527 protected ResultInfo(KindSelector pkind,
528 Type pt, CheckContext checkContext) {
529 this(pkind, pt, checkContext, CheckMode.NORMAL);
530 }
531
532 protected ResultInfo(KindSelector pkind,
533 Type pt, CheckContext checkContext, CheckMode checkMode) {
534 this.pkind = pkind;
535 this.pt = pt;
536 this.checkContext = checkContext;
537 this.checkMode = checkMode;
538 }
539
540 /**
541 * Should {@link Attr#attribTree} use the {@code ArgumentAttr} visitor instead of this one?
542 * @param tree The tree to be type-checked.
543 * @return true if {@code ArgumentAttr} should be used.
544 */
545 protected boolean needsArgumentAttr(JCTree tree) { return false; }
546
547 protected Type check(final DiagnosticPosition pos, final Type found) {
548 return chk.checkType(pos, found, pt, checkContext);
549 }
550
551 protected ResultInfo dup(Type newPt) {
552 return new ResultInfo(pkind, newPt, checkContext, checkMode);
553 }
554
555 protected ResultInfo dup(CheckContext newContext) {
556 return new ResultInfo(pkind, pt, newContext, checkMode);
557 }
558
559 protected ResultInfo dup(Type newPt, CheckContext newContext) {
560 return new ResultInfo(pkind, newPt, newContext, checkMode);
561 }
562
563 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) {
564 return new ResultInfo(pkind, newPt, newContext, newMode);
565 }
566
567 protected ResultInfo dup(CheckMode newMode) {
568 return new ResultInfo(pkind, pt, checkContext, newMode);
569 }
570
571 @Override
572 public String toString() {
573 if (pt != null) {
574 return pt.toString();
575 } else {
576 return "";
577 }
578 }
579 }
580
581 class MethodAttrInfo extends ResultInfo {
582 public MethodAttrInfo() {
583 this(chk.basicHandler);
584 }
585
586 public MethodAttrInfo(CheckContext checkContext) {
587 super(KindSelector.VAL, Infer.anyPoly, checkContext);
588 }
589
590 @Override
591 protected boolean needsArgumentAttr(JCTree tree) {
592 return true;
593 }
594
595 protected ResultInfo dup(Type newPt) {
596 throw new IllegalStateException();
597 }
598
599 protected ResultInfo dup(CheckContext newContext) {
600 return new MethodAttrInfo(newContext);
601 }
602
603 protected ResultInfo dup(Type newPt, CheckContext newContext) {
604 throw new IllegalStateException();
605 }
606
607 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) {
608 throw new IllegalStateException();
609 }
610
611 protected ResultInfo dup(CheckMode newMode) {
612 throw new IllegalStateException();
613 }
614 }
615
616 class RecoveryInfo extends ResultInfo {
617
618 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext) {
619 this(deferredAttrContext, Type.recoveryType);
620 }
621
622 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext, Type pt) {
623 super(KindSelector.VAL, pt, new Check.NestedCheckContext(chk.basicHandler) {
624 @Override
625 public DeferredAttr.DeferredAttrContext deferredAttrContext() {
626 return deferredAttrContext;
627 }
628 @Override
629 public boolean compatible(Type found, Type req, Warner warn) {
630 return true;
631 }
632 @Override
633 public void report(DiagnosticPosition pos, JCDiagnostic details) {
634 boolean needsReport = pt == Type.recoveryType ||
635 (details.getDiagnosticPosition() != null &&
636 details.getDiagnosticPosition().getTree().hasTag(LAMBDA));
637 if (needsReport) {
638 chk.basicHandler.report(pos, details);
639 }
640 }
641 });
642 }
643 }
644
645 final ResultInfo statInfo;
646 final ResultInfo varAssignmentInfo;
647 final ResultInfo methodAttrInfo;
648 final ResultInfo unknownExprInfo;
649 final ResultInfo unknownTypeInfo;
650 final ResultInfo unknownTypeExprInfo;
651 final ResultInfo recoveryInfo;
652 final MethodType initBlockType;
653
654 Type pt() {
655 return resultInfo.pt;
656 }
657
658 KindSelector pkind() {
659 return resultInfo.pkind;
660 }
661
662 /* ************************************************************************
663 * Visitor methods
664 *************************************************************************/
665
666 /** Visitor argument: the current environment.
667 */
668 Env<AttrContext> env;
669
670 /** Visitor argument: the currently expected attribution result.
671 */
672 ResultInfo resultInfo;
673
674 /** Visitor result: the computed type.
675 */
676 Type result;
677
678 MatchBindings matchBindings = MatchBindingsComputer.EMPTY;
679
680 /** Visitor method: attribute a tree, catching any completion failure
681 * exceptions. Return the tree's type.
682 *
683 * @param tree The tree to be visited.
684 * @param env The environment visitor argument.
685 * @param resultInfo The result info visitor argument.
686 */
687 Type attribTree(JCTree tree, Env<AttrContext> env, ResultInfo resultInfo) {
688 Env<AttrContext> prevEnv = this.env;
689 ResultInfo prevResult = this.resultInfo;
690 try {
691 this.env = env;
692 this.resultInfo = resultInfo;
693 if (resultInfo.needsArgumentAttr(tree)) {
694 result = argumentAttr.attribArg(tree, env);
695 } else {
696 tree.accept(this);
697 }
698 matchBindings = matchBindingsComputer.finishBindings(tree,
699 matchBindings);
700 if (tree == breakTree &&
701 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
702 breakTreeFound(copyEnv(env));
703 }
704 return result;
705 } catch (CompletionFailure ex) {
706 tree.type = syms.errType;
707 return chk.completionError(tree.pos(), ex);
708 } finally {
709 this.env = prevEnv;
710 this.resultInfo = prevResult;
711 }
712 }
713
714 protected void breakTreeFound(Env<AttrContext> env) {
715 throw new BreakAttr(env);
716 }
717
718 Env<AttrContext> copyEnv(Env<AttrContext> env) {
719 Env<AttrContext> newEnv =
720 env.dup(env.tree, env.info.dup(copyScope(env.info.scope)));
721 if (newEnv.outer != null) {
722 newEnv.outer = copyEnv(newEnv.outer);
723 }
724 return newEnv;
725 }
726
727 WriteableScope copyScope(WriteableScope sc) {
728 WriteableScope newScope = WriteableScope.create(sc.owner);
729 List<Symbol> elemsList = List.nil();
730 for (Symbol sym : sc.getSymbols()) {
731 elemsList = elemsList.prepend(sym);
732 }
733 for (Symbol s : elemsList) {
734 newScope.enter(s);
735 }
736 return newScope;
737 }
738
739 /** Derived visitor method: attribute an expression tree.
740 */
741 public Type attribExpr(JCTree tree, Env<AttrContext> env, Type pt) {
742 return attribTree(tree, env, new ResultInfo(KindSelector.VAL, !pt.hasTag(ERROR) ? pt : Type.noType));
743 }
744
745 /** Derived visitor method: attribute an expression tree with
746 * no constraints on the computed type.
747 */
748 public Type attribExpr(JCTree tree, Env<AttrContext> env) {
749 return attribTree(tree, env, unknownExprInfo);
750 }
751
752 /** Derived visitor method: attribute a type tree.
753 */
754 public Type attribType(JCTree tree, Env<AttrContext> env) {
755 Type result = attribType(tree, env, Type.noType);
756 return result;
757 }
758
759 /** Derived visitor method: attribute a type tree.
760 */
761 Type attribType(JCTree tree, Env<AttrContext> env, Type pt) {
762 Type result = attribTree(tree, env, new ResultInfo(KindSelector.TYP, pt));
763 return result;
764 }
765
766 /** Derived visitor method: attribute a statement or definition tree.
767 */
768 public Type attribStat(JCTree tree, Env<AttrContext> env) {
769 Env<AttrContext> analyzeEnv = analyzer.copyEnvIfNeeded(tree, env);
770 Type result = attribTree(tree, env, statInfo);
771 analyzer.analyzeIfNeeded(tree, analyzeEnv);
772 attrRecover.doRecovery();
773 return result;
774 }
775
776 /** Attribute a list of expressions, returning a list of types.
777 */
778 List<Type> attribExprs(List<JCExpression> trees, Env<AttrContext> env, Type pt) {
779 ListBuffer<Type> ts = new ListBuffer<>();
780 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
781 ts.append(attribExpr(l.head, env, pt));
782 return ts.toList();
783 }
784
785 /** Attribute a list of statements, returning nothing.
786 */
787 <T extends JCTree> void attribStats(List<T> trees, Env<AttrContext> env) {
788 for (List<T> l = trees; l.nonEmpty(); l = l.tail)
789 attribStat(l.head, env);
790 }
791
792 /** Attribute the arguments in a method call, returning the method kind.
793 */
794 KindSelector attribArgs(KindSelector initialKind, List<JCExpression> trees, Env<AttrContext> env, ListBuffer<Type> argtypes) {
795 KindSelector kind = initialKind;
796 for (JCExpression arg : trees) {
797 Type argtype = chk.checkNonVoid(arg, attribTree(arg, env, methodAttrInfo));
798 if (argtype.hasTag(DEFERRED)) {
799 kind = KindSelector.of(KindSelector.POLY, kind);
800 }
801 argtypes.append(argtype);
802 }
803 return kind;
804 }
805
806 /** Attribute a type argument list, returning a list of types.
807 * Caller is responsible for calling checkRefTypes.
808 */
809 List<Type> attribAnyTypes(List<JCExpression> trees, Env<AttrContext> env) {
810 ListBuffer<Type> argtypes = new ListBuffer<>();
811 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
812 argtypes.append(attribType(l.head, env));
813 return argtypes.toList();
814 }
815
816 /** Attribute a type argument list, returning a list of types.
817 * Check that all the types are references.
818 */
819 List<Type> attribTypes(List<JCExpression> trees, Env<AttrContext> env) {
820 List<Type> types = attribAnyTypes(trees, env);
821 return chk.checkRefTypes(trees, types);
822 }
823
824 /**
825 * Attribute type variables (of generic classes or methods).
826 * Compound types are attributed later in attribBounds.
827 * @param typarams the type variables to enter
828 * @param env the current environment
829 */
830 void attribTypeVariables(List<JCTypeParameter> typarams, Env<AttrContext> env, boolean checkCyclic) {
831 for (JCTypeParameter tvar : typarams) {
832 TypeVar a = (TypeVar)tvar.type;
833 a.tsym.flags_field |= UNATTRIBUTED;
834 a.setUpperBound(Type.noType);
835 if (!tvar.bounds.isEmpty()) {
836 List<Type> bounds = List.of(attribType(tvar.bounds.head, env));
837 for (JCExpression bound : tvar.bounds.tail)
838 bounds = bounds.prepend(attribType(bound, env));
839 types.setBounds(a, bounds.reverse());
840 } else {
841 // if no bounds are given, assume a single bound of
842 // java.lang.Object.
843 types.setBounds(a, List.of(syms.objectType));
844 }
845 a.tsym.flags_field &= ~UNATTRIBUTED;
846 }
847 if (checkCyclic) {
848 for (JCTypeParameter tvar : typarams) {
849 chk.checkNonCyclic(tvar.pos(), (TypeVar)tvar.type);
850 }
851 }
852 }
853
854 /**
855 * Attribute the type references in a list of annotations.
856 */
857 void attribAnnotationTypes(List<JCAnnotation> annotations,
858 Env<AttrContext> env) {
859 for (List<JCAnnotation> al = annotations; al.nonEmpty(); al = al.tail) {
860 JCAnnotation a = al.head;
861 attribType(a.annotationType, env);
862 }
863 }
864
865 /**
866 * Attribute a "lazy constant value".
867 * @param env The env for the const value
868 * @param variable The initializer for the const value
869 * @param type The expected type, or null
870 * @see VarSymbol#setLazyConstValue
871 */
872 public Object attribLazyConstantValue(Env<AttrContext> env,
873 Env<AttrContext> enclosingEnv,
874 JCVariableDecl variable,
875 Type type) {
876 deferredLintHandler.push(variable);
877 final JavaFileObject prevSource = log.useSource(env.toplevel.sourcefile);
878 try {
879 doQueueScanTreeAndTypeAnnotateForVarInit(variable, enclosingEnv);
880 Type itype = attribExpr(variable.init, env, type);
881 if (variable.isImplicitlyTyped()) {
882 //fixup local variable type
883 type = variable.type = variable.sym.type = chk.checkLocalVarType(variable, itype, variable.name);
884 }
885 if (itype.constValue() != null) {
886 return coerce(itype, type).constValue();
887 } else {
888 return null;
889 }
890 } finally {
891 log.useSource(prevSource);
892 deferredLintHandler.pop();
893 }
894 }
895
896 /** Attribute type reference in an `extends', `implements', or 'permits' clause.
897 * Supertypes of anonymous inner classes are usually already attributed.
898 *
899 * @param tree The tree making up the type reference.
900 * @param env The environment current at the reference.
901 * @param classExpected true if only a class is expected here.
902 * @param interfaceExpected true if only an interface is expected here.
903 */
904 Type attribBase(JCTree tree,
905 Env<AttrContext> env,
906 boolean classExpected,
907 boolean interfaceExpected,
908 boolean checkExtensible) {
909 Type t = tree.type != null ?
910 tree.type :
911 attribType(tree, env);
912 try {
913 return checkBase(t, tree, env, classExpected, interfaceExpected, checkExtensible);
914 } catch (CompletionFailure ex) {
915 chk.completionError(tree.pos(), ex);
916 return t;
917 }
918 }
919 Type checkBase(Type t,
920 JCTree tree,
921 Env<AttrContext> env,
922 boolean classExpected,
923 boolean interfaceExpected,
924 boolean checkExtensible) {
925 final DiagnosticPosition pos = tree.hasTag(TYPEAPPLY) ?
926 (((JCTypeApply) tree).clazz).pos() : tree.pos();
927 if (t.tsym.isAnonymous()) {
928 log.error(pos, Errors.CantInheritFromAnon);
929 return types.createErrorType(t);
930 }
931 if (t.isErroneous())
932 return t;
933 if (t.hasTag(TYPEVAR) && !classExpected && !interfaceExpected) {
934 // check that type variable is already visible
935 if (t.getUpperBound() == null) {
936 log.error(pos, Errors.IllegalForwardRef);
937 return types.createErrorType(t);
938 }
939 } else {
940 t = chk.checkClassType(pos, t, checkExtensible);
941 }
942 if (interfaceExpected && (t.tsym.flags() & INTERFACE) == 0) {
943 log.error(pos, Errors.IntfExpectedHere);
944 // return errType is necessary since otherwise there might
945 // be undetected cycles which cause attribution to loop
946 return types.createErrorType(t);
947 } else if (checkExtensible &&
948 classExpected &&
949 (t.tsym.flags() & INTERFACE) != 0) {
950 log.error(pos, Errors.NoIntfExpectedHere);
951 return types.createErrorType(t);
952 }
953 if (checkExtensible &&
954 ((t.tsym.flags() & FINAL) != 0)) {
955 log.error(pos,
956 Errors.CantInheritFromFinal(t.tsym));
957 }
958 chk.checkNonCyclic(pos, t);
959 return t;
960 }
961
962 Type attribIdentAsEnumType(Env<AttrContext> env, JCIdent id) {
963 Assert.check((env.enclClass.sym.flags() & ENUM) != 0);
964 id.type = env.info.scope.owner.enclClass().type;
965 id.sym = env.info.scope.owner.enclClass();
966 return id.type;
967 }
968
969 public void visitClassDef(JCClassDecl tree) {
970 Optional<ArgumentAttr.LocalCacheContext> localCacheContext =
971 Optional.ofNullable(env.info.attributionMode.isSpeculative ?
972 argumentAttr.withLocalCacheContext() : null);
973 boolean ctorProloguePrev = env.info.ctorPrologue;
974 try {
975 // Local and anonymous classes have not been entered yet, so we need to
976 // do it now.
977 if (env.info.scope.owner.kind.matches(KindSelector.VAL_MTH)) {
978 enter.classEnter(tree, env);
979 } else {
980 // If this class declaration is part of a class level annotation,
981 // as in @MyAnno(new Object() {}) class MyClass {}, enter it in
982 // order to simplify later steps and allow for sensible error
983 // messages.
984 if (env.tree.hasTag(NEWCLASS) && TreeInfo.isInAnnotation(env, tree))
985 enter.classEnter(tree, env);
986 }
987
988 ClassSymbol c = tree.sym;
989 if (c == null) {
990 // exit in case something drastic went wrong during enter.
991 result = null;
992 } else {
993 // make sure class has been completed:
994 c.complete();
995
996 // If a class declaration appears in a constructor prologue,
997 // that means it's either a local class or an anonymous class.
998 // Either way, there is no immediately enclosing instance.
999 if (ctorProloguePrev) {
1000 c.flags_field |= NOOUTERTHIS;
1001 }
1002 attribClass(tree.pos(), c);
1003 result = tree.type = c.type;
1004 }
1005 } finally {
1006 localCacheContext.ifPresent(LocalCacheContext::leave);
1007 env.info.ctorPrologue = ctorProloguePrev;
1008 }
1009 }
1010
1011 public void visitMethodDef(JCMethodDecl tree) {
1012 MethodSymbol m = tree.sym;
1013 boolean isDefaultMethod = (m.flags() & DEFAULT) != 0;
1014
1015 Lint lint = env.info.lint.augment(m);
1016 Lint prevLint = chk.setLint(lint);
1017 boolean ctorProloguePrev = env.info.ctorPrologue;
1018 Assert.check(!env.info.ctorPrologue);
1019 MethodSymbol prevMethod = chk.setMethod(m);
1020 try {
1021 deferredLintHandler.flush(tree, lint);
1022 chk.checkDeprecatedAnnotation(tree.pos(), m);
1023
1024
1025 // Create a new environment with local scope
1026 // for attributing the method.
1027 Env<AttrContext> localEnv = memberEnter.methodEnv(tree, env);
1028 localEnv.info.lint = lint;
1029
1030 attribStats(tree.typarams, localEnv);
1031
1032 // If we override any other methods, check that we do so properly.
1033 // JLS ???
1034 if (m.isStatic()) {
1035 chk.checkHideClashes(tree.pos(), env.enclClass.type, m);
1036 } else {
1037 chk.checkOverrideClashes(tree.pos(), env.enclClass.type, m);
1038 }
1039 chk.checkOverride(env, tree, m);
1040
1041 if (isDefaultMethod && types.overridesObjectMethod(m.enclClass(), m)) {
1042 log.error(tree, Errors.DefaultOverridesObjectMember(m.name, Kinds.kindName(m.location()), m.location()));
1043 }
1044
1045 // Enter all type parameters into the local method scope.
1046 for (List<JCTypeParameter> l = tree.typarams; l.nonEmpty(); l = l.tail)
1047 localEnv.info.scope.enterIfAbsent(l.head.type.tsym);
1048
1049 ClassSymbol owner = env.enclClass.sym;
1050 if ((owner.flags() & ANNOTATION) != 0 &&
1051 (tree.params.nonEmpty() ||
1052 tree.recvparam != null))
1053 log.error(tree.params.nonEmpty() ?
1054 tree.params.head.pos() :
1055 tree.recvparam.pos(),
1056 Errors.IntfAnnotationMembersCantHaveParams);
1057
1058 // Attribute all value parameters.
1059 for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) {
1060 attribStat(l.head, localEnv);
1061 }
1062
1063 chk.checkVarargsMethodDecl(localEnv, tree);
1064
1065 // Check that type parameters are well-formed.
1066 chk.validate(tree.typarams, localEnv);
1067
1068 // Check that result type is well-formed.
1069 if (tree.restype != null && !tree.restype.type.hasTag(VOID))
1070 chk.validate(tree.restype, localEnv);
1071
1072 // Check that receiver type is well-formed.
1073 if (tree.recvparam != null) {
1074 // Use a new environment to check the receiver parameter.
1075 // Otherwise I get "might not have been initialized" errors.
1076 // Is there a better way?
1077 Env<AttrContext> newEnv = memberEnter.methodEnv(tree, env);
1078 attribType(tree.recvparam, newEnv);
1079 chk.validate(tree.recvparam, newEnv);
1080 }
1081
1082 // Is this method a constructor?
1083 boolean isConstructor = TreeInfo.isConstructor(tree);
1084
1085 if (env.enclClass.sym.isRecord() && tree.sym.owner.kind == TYP) {
1086 // lets find if this method is an accessor
1087 Optional<? extends RecordComponent> recordComponent = env.enclClass.sym.getRecordComponents().stream()
1088 .filter(rc -> rc.accessor == tree.sym && (rc.accessor.flags_field & GENERATED_MEMBER) == 0).findFirst();
1089 if (recordComponent.isPresent()) {
1090 // the method is a user defined accessor lets check that everything is fine
1091 if (!tree.sym.isPublic()) {
1092 log.error(tree, Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.MethodMustBePublic));
1093 }
1094 if (!types.isSameType(tree.sym.type.getReturnType(), recordComponent.get().type)) {
1095 log.error(tree, Errors.InvalidAccessorMethodInRecord(env.enclClass.sym,
1096 Fragments.AccessorReturnTypeDoesntMatch(tree.sym, recordComponent.get())));
1097 }
1098 if (tree.sym.type.asMethodType().thrown != null && !tree.sym.type.asMethodType().thrown.isEmpty()) {
1099 log.error(tree,
1100 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodCantThrowException));
1101 }
1102 if (!tree.typarams.isEmpty()) {
1103 log.error(tree,
1104 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodMustNotBeGeneric));
1105 }
1106 if (tree.sym.isStatic()) {
1107 log.error(tree,
1108 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodMustNotBeStatic));
1109 }
1110 }
1111
1112 if (isConstructor) {
1113 // if this a constructor other than the canonical one
1114 if ((tree.sym.flags_field & RECORD) == 0) {
1115 if (!TreeInfo.hasConstructorCall(tree, names._this)) {
1116 log.error(tree, Errors.NonCanonicalConstructorInvokeAnotherConstructor(env.enclClass.sym));
1117 }
1118 } else {
1119 // but if it is the canonical:
1120
1121 /* if user generated, then it shouldn't:
1122 * - have an accessibility stricter than that of the record type
1123 * - explicitly invoke any other constructor
1124 */
1125 if ((tree.sym.flags_field & GENERATEDCONSTR) == 0) {
1126 if (Check.protection(m.flags()) > Check.protection(env.enclClass.sym.flags())) {
1127 log.error(tree,
1128 (env.enclClass.sym.flags() & AccessFlags) == 0 ?
1129 Errors.InvalidCanonicalConstructorInRecord(
1130 Fragments.Canonical,
1131 env.enclClass.sym.name,
1132 Fragments.CanonicalMustNotHaveStrongerAccess("package")
1133 ) :
1134 Errors.InvalidCanonicalConstructorInRecord(
1135 Fragments.Canonical,
1136 env.enclClass.sym.name,
1137 Fragments.CanonicalMustNotHaveStrongerAccess(asFlagSet(env.enclClass.sym.flags() & AccessFlags))
1138 )
1139 );
1140 }
1141
1142 if (TreeInfo.hasAnyConstructorCall(tree)) {
1143 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1144 Fragments.Canonical, env.enclClass.sym.name,
1145 Fragments.CanonicalMustNotContainExplicitConstructorInvocation));
1146 }
1147 }
1148
1149 // also we want to check that no type variables have been defined
1150 if (!tree.typarams.isEmpty()) {
1151 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1152 Fragments.Canonical, env.enclClass.sym.name, Fragments.CanonicalMustNotDeclareTypeVariables));
1153 }
1154
1155 /* and now we need to check that the constructor's arguments are exactly the same as those of the
1156 * record components
1157 */
1158 List<? extends RecordComponent> recordComponents = env.enclClass.sym.getRecordComponents();
1159 List<Type> recordFieldTypes = TreeInfo.recordFields(env.enclClass).map(vd -> vd.sym.type);
1160 for (JCVariableDecl param: tree.params) {
1161 boolean paramIsVarArgs = (param.sym.flags_field & VARARGS) != 0;
1162 if (!types.isSameType(param.type, recordFieldTypes.head) ||
1163 (recordComponents.head.isVarargs() != paramIsVarArgs)) {
1164 log.error(param, Errors.InvalidCanonicalConstructorInRecord(
1165 Fragments.Canonical, env.enclClass.sym.name,
1166 Fragments.TypeMustBeIdenticalToCorrespondingRecordComponentType));
1167 }
1168 recordComponents = recordComponents.tail;
1169 recordFieldTypes = recordFieldTypes.tail;
1170 }
1171 }
1172 }
1173 }
1174
1175 // annotation method checks
1176 if ((owner.flags() & ANNOTATION) != 0) {
1177 // annotation method cannot have throws clause
1178 if (tree.thrown.nonEmpty()) {
1179 log.error(tree.thrown.head.pos(),
1180 Errors.ThrowsNotAllowedInIntfAnnotation);
1181 }
1182 // annotation method cannot declare type-parameters
1183 if (tree.typarams.nonEmpty()) {
1184 log.error(tree.typarams.head.pos(),
1185 Errors.IntfAnnotationMembersCantHaveTypeParams);
1186 }
1187 // validate annotation method's return type (could be an annotation type)
1188 chk.validateAnnotationType(tree.restype);
1189 // ensure that annotation method does not clash with members of Object/Annotation
1190 chk.validateAnnotationMethod(tree.pos(), m);
1191 }
1192
1193 for (List<JCExpression> l = tree.thrown; l.nonEmpty(); l = l.tail)
1194 chk.checkType(l.head.pos(), l.head.type, syms.throwableType);
1195
1196 if (tree.body == null) {
1197 // Empty bodies are only allowed for
1198 // abstract, native, or interface methods, or for methods
1199 // in a retrofit signature class.
1200 if (tree.defaultValue != null) {
1201 if ((owner.flags() & ANNOTATION) == 0)
1202 log.error(tree.pos(),
1203 Errors.DefaultAllowedInIntfAnnotationMember);
1204 }
1205 if (isDefaultMethod || (tree.sym.flags() & (ABSTRACT | NATIVE)) == 0)
1206 log.error(tree.pos(), Errors.MissingMethBodyOrDeclAbstract);
1207 } else {
1208 if ((tree.sym.flags() & (ABSTRACT|DEFAULT|PRIVATE)) == ABSTRACT) {
1209 if ((owner.flags() & INTERFACE) != 0) {
1210 log.error(tree.body.pos(), Errors.IntfMethCantHaveBody);
1211 } else {
1212 log.error(tree.pos(), Errors.AbstractMethCantHaveBody);
1213 }
1214 } else if ((tree.mods.flags & NATIVE) != 0) {
1215 log.error(tree.pos(), Errors.NativeMethCantHaveBody);
1216 }
1217 // Add an implicit super() call unless an explicit call to
1218 // super(...) or this(...) is given
1219 // or we are compiling class java.lang.Object.
1220 if (isConstructor && owner.type != syms.objectType) {
1221 if (!TreeInfo.hasAnyConstructorCall(tree)) {
1222 JCStatement supCall = make.at(tree.body.pos).Exec(make.Apply(List.nil(),
1223 make.Ident(names._super), make.Idents(List.nil())));
1224 tree.body.stats = tree.body.stats.prepend(supCall);
1225 } else if ((env.enclClass.sym.flags() & ENUM) != 0 &&
1226 (tree.mods.flags & GENERATEDCONSTR) == 0 &&
1227 TreeInfo.hasConstructorCall(tree, names._super)) {
1228 // enum constructors are not allowed to call super
1229 // directly, so make sure there aren't any super calls
1230 // in enum constructors, except in the compiler
1231 // generated one.
1232 log.error(tree.body.stats.head.pos(),
1233 Errors.CallToSuperNotAllowedInEnumCtor(env.enclClass.sym));
1234 }
1235 if (env.enclClass.sym.isRecord() && (tree.sym.flags_field & RECORD) != 0) { // we are seeing the canonical constructor
1236 List<Name> recordComponentNames = TreeInfo.recordFields(env.enclClass).map(vd -> vd.sym.name);
1237 List<Name> initParamNames = tree.sym.params.map(p -> p.name);
1238 if (!initParamNames.equals(recordComponentNames)) {
1239 log.error(tree, Errors.InvalidCanonicalConstructorInRecord(
1240 Fragments.Canonical, env.enclClass.sym.name, Fragments.CanonicalWithNameMismatch));
1241 }
1242 if (tree.sym.type.asMethodType().thrown != null && !tree.sym.type.asMethodType().thrown.isEmpty()) {
1243 log.error(tree,
1244 Errors.InvalidCanonicalConstructorInRecord(
1245 TreeInfo.isCompactConstructor(tree) ? Fragments.Compact : Fragments.Canonical,
1246 env.enclClass.sym.name,
1247 Fragments.ThrowsClauseNotAllowedForCanonicalConstructor(
1248 TreeInfo.isCompactConstructor(tree) ? Fragments.Compact : Fragments.Canonical)));
1249 }
1250 }
1251 }
1252
1253 // Attribute all type annotations in the body
1254 annotate.queueScanTreeAndTypeAnnotate(tree.body, localEnv, m, null);
1255 annotate.flush();
1256
1257 // Start of constructor prologue
1258 localEnv.info.ctorPrologue = isConstructor;
1259
1260 // Attribute method body.
1261 attribStat(tree.body, localEnv);
1262 }
1263
1264 localEnv.info.scope.leave();
1265 result = tree.type = m.type;
1266 } finally {
1267 chk.setLint(prevLint);
1268 chk.setMethod(prevMethod);
1269 env.info.ctorPrologue = ctorProloguePrev;
1270 }
1271 }
1272
1273 public void visitVarDef(JCVariableDecl tree) {
1274 // Local variables have not been entered yet, so we need to do it now:
1275 if (env.info.scope.owner.kind == MTH || env.info.scope.owner.kind == VAR) {
1276 if (tree.sym != null) {
1277 // parameters have already been entered
1278 env.info.scope.enter(tree.sym);
1279 } else {
1280 if (tree.isImplicitlyTyped() && (tree.getModifiers().flags & PARAMETER) == 0) {
1281 if (tree.init == null) {
1282 //cannot use 'var' without initializer
1283 log.error(tree, Errors.CantInferLocalVarType(tree.name, Fragments.LocalMissingInit));
1284 tree.vartype = make.Erroneous();
1285 } else {
1286 Fragment msg = canInferLocalVarType(tree);
1287 if (msg != null) {
1288 //cannot use 'var' with initializer which require an explicit target
1289 //(e.g. lambda, method reference, array initializer).
1290 log.error(tree, Errors.CantInferLocalVarType(tree.name, msg));
1291 tree.vartype = make.Erroneous();
1292 }
1293 }
1294 }
1295 try {
1296 annotate.blockAnnotations();
1297 memberEnter.memberEnter(tree, env);
1298 } finally {
1299 annotate.unblockAnnotations();
1300 }
1301 }
1302 } else {
1303 doQueueScanTreeAndTypeAnnotateForVarInit(tree, env);
1304 }
1305
1306 VarSymbol v = tree.sym;
1307 Lint lint = env.info.lint.augment(v);
1308 Lint prevLint = chk.setLint(lint);
1309
1310 // Check that the variable's declared type is well-formed.
1311 boolean isImplicitLambdaParameter = env.tree.hasTag(LAMBDA) &&
1312 ((JCLambda)env.tree).paramKind == JCLambda.ParameterKind.IMPLICIT &&
1313 (tree.sym.flags() & PARAMETER) != 0;
1314 chk.validate(tree.vartype, env, !isImplicitLambdaParameter && !tree.isImplicitlyTyped());
1315
1316 try {
1317 v.getConstValue(); // ensure compile-time constant initializer is evaluated
1318 deferredLintHandler.flush(tree, lint);
1319 chk.checkDeprecatedAnnotation(tree.pos(), v);
1320
1321 if (tree.init != null) {
1322 if ((v.flags_field & FINAL) == 0 ||
1323 !memberEnter.needsLazyConstValue(tree.init)) {
1324 // Not a compile-time constant
1325 // Attribute initializer in a new environment
1326 // with the declared variable as owner.
1327 // Check that initializer conforms to variable's declared type.
1328 Env<AttrContext> initEnv = memberEnter.initEnv(tree, env);
1329 initEnv.info.lint = lint;
1330 // In order to catch self-references, we set the variable's
1331 // declaration position to maximal possible value, effectively
1332 // marking the variable as undefined.
1333 initEnv.info.enclVar = v;
1334 attribExpr(tree.init, initEnv, v.type);
1335 if (tree.isImplicitlyTyped()) {
1336 //fixup local variable type
1337 v.type = chk.checkLocalVarType(tree, tree.init.type, tree.name);
1338 }
1339 }
1340 if (tree.isImplicitlyTyped()) {
1341 setSyntheticVariableType(tree, v.type);
1342 }
1343 }
1344 result = tree.type = v.type;
1345 if (env.enclClass.sym.isRecord() && tree.sym.owner.kind == TYP && !v.isStatic()) {
1346 if (isNonArgsMethodInObject(v.name)) {
1347 log.error(tree, Errors.IllegalRecordComponentName(v));
1348 }
1349 }
1350 }
1351 finally {
1352 chk.setLint(prevLint);
1353 }
1354 }
1355
1356 private void doQueueScanTreeAndTypeAnnotateForVarInit(JCVariableDecl tree, Env<AttrContext> env) {
1357 if (tree.init != null &&
1358 (tree.mods.flags & Flags.FIELD_INIT_TYPE_ANNOTATIONS_QUEUED) == 0 &&
1359 env.info.scope.owner.kind != MTH && env.info.scope.owner.kind != VAR) {
1360 tree.mods.flags |= Flags.FIELD_INIT_TYPE_ANNOTATIONS_QUEUED;
1361 // Field initializer expression need to be entered.
1362 annotate.queueScanTreeAndTypeAnnotate(tree.init, env, tree.sym, tree);
1363 annotate.flush();
1364 }
1365 }
1366
1367 private boolean isNonArgsMethodInObject(Name name) {
1368 for (Symbol s : syms.objectType.tsym.members().getSymbolsByName(name, s -> s.kind == MTH)) {
1369 if (s.type.getParameterTypes().isEmpty()) {
1370 return true;
1371 }
1372 }
1373 return false;
1374 }
1375
1376 Fragment canInferLocalVarType(JCVariableDecl tree) {
1377 LocalInitScanner lis = new LocalInitScanner();
1378 lis.scan(tree.init);
1379 return lis.badInferenceMsg;
1380 }
1381
1382 static class LocalInitScanner extends TreeScanner {
1383 Fragment badInferenceMsg = null;
1384 boolean needsTarget = true;
1385
1386 @Override
1387 public void visitNewArray(JCNewArray tree) {
1388 if (tree.elemtype == null && needsTarget) {
1389 badInferenceMsg = Fragments.LocalArrayMissingTarget;
1390 }
1391 }
1392
1393 @Override
1394 public void visitLambda(JCLambda tree) {
1395 if (needsTarget) {
1396 badInferenceMsg = Fragments.LocalLambdaMissingTarget;
1397 }
1398 }
1399
1400 @Override
1401 public void visitTypeCast(JCTypeCast tree) {
1402 boolean prevNeedsTarget = needsTarget;
1403 try {
1404 needsTarget = false;
1405 super.visitTypeCast(tree);
1406 } finally {
1407 needsTarget = prevNeedsTarget;
1408 }
1409 }
1410
1411 @Override
1412 public void visitReference(JCMemberReference tree) {
1413 if (needsTarget) {
1414 badInferenceMsg = Fragments.LocalMrefMissingTarget;
1415 }
1416 }
1417
1418 @Override
1419 public void visitNewClass(JCNewClass tree) {
1420 boolean prevNeedsTarget = needsTarget;
1421 try {
1422 needsTarget = false;
1423 super.visitNewClass(tree);
1424 } finally {
1425 needsTarget = prevNeedsTarget;
1426 }
1427 }
1428
1429 @Override
1430 public void visitApply(JCMethodInvocation tree) {
1431 boolean prevNeedsTarget = needsTarget;
1432 try {
1433 needsTarget = false;
1434 super.visitApply(tree);
1435 } finally {
1436 needsTarget = prevNeedsTarget;
1437 }
1438 }
1439 }
1440
1441 public void visitSkip(JCSkip tree) {
1442 result = null;
1443 }
1444
1445 public void visitBlock(JCBlock tree) {
1446 if (env.info.scope.owner.kind == TYP || env.info.scope.owner.kind == ERR) {
1447 // Block is a static or instance initializer;
1448 // let the owner of the environment be a freshly
1449 // created BLOCK-method.
1450 Symbol fakeOwner =
1451 new MethodSymbol(tree.flags | BLOCK |
1452 env.info.scope.owner.flags() & STRICTFP, names.empty, initBlockType,
1453 env.info.scope.owner);
1454 final Env<AttrContext> localEnv =
1455 env.dup(tree, env.info.dup(env.info.scope.dupUnshared(fakeOwner)));
1456
1457 if ((tree.flags & STATIC) != 0) localEnv.info.staticLevel++;
1458 // Attribute all type annotations in the block
1459 annotate.queueScanTreeAndTypeAnnotate(tree, localEnv, localEnv.info.scope.owner, null);
1460 annotate.flush();
1461 attribStats(tree.stats, localEnv);
1462
1463 {
1464 // Store init and clinit type annotations with the ClassSymbol
1465 // to allow output in Gen.normalizeDefs.
1466 ClassSymbol cs = (ClassSymbol)env.info.scope.owner;
1467 List<Attribute.TypeCompound> tas = localEnv.info.scope.owner.getRawTypeAttributes();
1468 if ((tree.flags & STATIC) != 0) {
1469 cs.appendClassInitTypeAttributes(tas);
1470 } else {
1471 cs.appendInitTypeAttributes(tas);
1472 }
1473 }
1474 } else {
1475 // Create a new local environment with a local scope.
1476 Env<AttrContext> localEnv =
1477 env.dup(tree, env.info.dup(env.info.scope.dup()));
1478 try {
1479 attribStats(tree.stats, localEnv);
1480 } finally {
1481 localEnv.info.scope.leave();
1482 }
1483 }
1484 result = null;
1485 }
1486
1487 public void visitDoLoop(JCDoWhileLoop tree) {
1488 attribStat(tree.body, env.dup(tree));
1489 attribExpr(tree.cond, env, syms.booleanType);
1490 handleLoopConditionBindings(matchBindings, tree, tree.body);
1491 result = null;
1492 }
1493
1494 public void visitWhileLoop(JCWhileLoop tree) {
1495 attribExpr(tree.cond, env, syms.booleanType);
1496 MatchBindings condBindings = matchBindings;
1497 // include condition's bindings when true in the body:
1498 Env<AttrContext> whileEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
1499 try {
1500 attribStat(tree.body, whileEnv.dup(tree));
1501 } finally {
1502 whileEnv.info.scope.leave();
1503 }
1504 handleLoopConditionBindings(condBindings, tree, tree.body);
1505 result = null;
1506 }
1507
1508 public void visitForLoop(JCForLoop tree) {
1509 Env<AttrContext> loopEnv =
1510 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1511 MatchBindings condBindings = MatchBindingsComputer.EMPTY;
1512 try {
1513 attribStats(tree.init, loopEnv);
1514 if (tree.cond != null) {
1515 attribExpr(tree.cond, loopEnv, syms.booleanType);
1516 // include condition's bindings when true in the body and step:
1517 condBindings = matchBindings;
1518 }
1519 Env<AttrContext> bodyEnv = bindingEnv(loopEnv, condBindings.bindingsWhenTrue);
1520 try {
1521 bodyEnv.tree = tree; // before, we were not in loop!
1522 attribStats(tree.step, bodyEnv);
1523 attribStat(tree.body, bodyEnv);
1524 } finally {
1525 bodyEnv.info.scope.leave();
1526 }
1527 result = null;
1528 }
1529 finally {
1530 loopEnv.info.scope.leave();
1531 }
1532 handleLoopConditionBindings(condBindings, tree, tree.body);
1533 }
1534
1535 /**
1536 * Include condition's bindings when false after the loop, if cannot get out of the loop
1537 */
1538 private void handleLoopConditionBindings(MatchBindings condBindings,
1539 JCStatement loop,
1540 JCStatement loopBody) {
1541 if (condBindings.bindingsWhenFalse.nonEmpty() &&
1542 !breaksTo(env, loop, loopBody)) {
1543 addBindings2Scope(loop, condBindings.bindingsWhenFalse);
1544 }
1545 }
1546
1547 private boolean breaksTo(Env<AttrContext> env, JCTree loop, JCTree body) {
1548 preFlow(body);
1549 return flow.breaksToTree(env, loop, body, make);
1550 }
1551
1552 /**
1553 * Add given bindings to the current scope, unless there's a break to
1554 * an immediately enclosing labeled statement.
1555 */
1556 private void addBindings2Scope(JCStatement introducingStatement,
1557 List<BindingSymbol> bindings) {
1558 if (bindings.isEmpty()) {
1559 return ;
1560 }
1561
1562 var searchEnv = env;
1563 while (searchEnv.tree instanceof JCLabeledStatement labeled &&
1564 labeled.body == introducingStatement) {
1565 if (breaksTo(env, labeled, labeled.body)) {
1566 //breaking to an immediately enclosing labeled statement
1567 return ;
1568 }
1569 searchEnv = searchEnv.next;
1570 introducingStatement = labeled;
1571 }
1572
1573 //include condition's body when false after the while, if cannot get out of the loop
1574 bindings.forEach(env.info.scope::enter);
1575 bindings.forEach(BindingSymbol::preserveBinding);
1576 }
1577
1578 public void visitForeachLoop(JCEnhancedForLoop tree) {
1579 Env<AttrContext> loopEnv =
1580 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1581 try {
1582 //the Formal Parameter of a for-each loop is not in the scope when
1583 //attributing the for-each expression; we mimic this by attributing
1584 //the for-each expression first (against original scope).
1585 Type exprType = types.cvarUpperBound(attribExpr(tree.expr, loopEnv));
1586 chk.checkNonVoid(tree.pos(), exprType);
1587 Type elemtype = types.elemtype(exprType); // perhaps expr is an array?
1588 if (elemtype == null) {
1589 // or perhaps expr implements Iterable<T>?
1590 Type base = types.asSuper(exprType, syms.iterableType.tsym);
1591 if (base == null) {
1592 log.error(tree.expr.pos(),
1593 Errors.ForeachNotApplicableToType(exprType,
1594 Fragments.TypeReqArrayOrIterable));
1595 elemtype = types.createErrorType(exprType);
1596 } else {
1597 List<Type> iterableParams = base.allparams();
1598 elemtype = iterableParams.isEmpty()
1599 ? syms.objectType
1600 : types.wildUpperBound(iterableParams.head);
1601
1602 // Check the return type of the method iterator().
1603 // This is the bare minimum we need to verify to make sure code generation doesn't crash.
1604 Symbol iterSymbol = rs.resolveInternalMethod(tree.pos(),
1605 loopEnv, types.skipTypeVars(exprType, false), names.iterator, List.nil(), List.nil());
1606 if (types.asSuper(iterSymbol.type.getReturnType(), syms.iteratorType.tsym) == null) {
1607 log.error(tree.pos(),
1608 Errors.ForeachNotApplicableToType(exprType, Fragments.TypeReqArrayOrIterable));
1609 }
1610 }
1611 }
1612 if (tree.var.isImplicitlyTyped()) {
1613 Type inferredType = chk.checkLocalVarType(tree.var, elemtype, tree.var.name);
1614 setSyntheticVariableType(tree.var, inferredType);
1615 }
1616 attribStat(tree.var, loopEnv);
1617 chk.checkType(tree.expr.pos(), elemtype, tree.var.sym.type);
1618 loopEnv.tree = tree; // before, we were not in loop!
1619 attribStat(tree.body, loopEnv);
1620 result = null;
1621 }
1622 finally {
1623 loopEnv.info.scope.leave();
1624 }
1625 }
1626
1627 public void visitLabelled(JCLabeledStatement tree) {
1628 // Check that label is not used in an enclosing statement
1629 Env<AttrContext> env1 = env;
1630 while (env1 != null && !env1.tree.hasTag(CLASSDEF)) {
1631 if (env1.tree.hasTag(LABELLED) &&
1632 ((JCLabeledStatement) env1.tree).label == tree.label) {
1633 log.error(tree.pos(),
1634 Errors.LabelAlreadyInUse(tree.label));
1635 break;
1636 }
1637 env1 = env1.next;
1638 }
1639
1640 attribStat(tree.body, env.dup(tree));
1641 result = null;
1642 }
1643
1644 public void visitSwitch(JCSwitch tree) {
1645 handleSwitch(tree, tree.selector, tree.cases, (c, caseEnv) -> {
1646 attribStats(c.stats, caseEnv);
1647 });
1648 result = null;
1649 }
1650
1651 public void visitSwitchExpression(JCSwitchExpression tree) {
1652 boolean wrongContext = false;
1653
1654 tree.polyKind = (pt().hasTag(NONE) && pt() != Type.recoveryType && pt() != Infer.anyPoly) ?
1655 PolyKind.STANDALONE : PolyKind.POLY;
1656
1657 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) {
1658 //this means we are returning a poly conditional from void-compatible lambda expression
1659 resultInfo.checkContext.report(tree, diags.fragment(Fragments.SwitchExpressionTargetCantBeVoid));
1660 resultInfo = recoveryInfo;
1661 wrongContext = true;
1662 }
1663
1664 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ?
1665 unknownExprInfo :
1666 resultInfo.dup(switchExpressionContext(resultInfo.checkContext));
1667
1668 ListBuffer<DiagnosticPosition> caseTypePositions = new ListBuffer<>();
1669 ListBuffer<Type> caseTypes = new ListBuffer<>();
1670
1671 handleSwitch(tree, tree.selector, tree.cases, (c, caseEnv) -> {
1672 caseEnv.info.yieldResult = condInfo;
1673 attribStats(c.stats, caseEnv);
1674 new TreeScanner() {
1675 @Override
1676 public void visitYield(JCYield brk) {
1677 if (brk.target == tree) {
1678 caseTypePositions.append(brk.value != null ? brk.value.pos() : brk.pos());
1679 caseTypes.append(brk.value != null ? brk.value.type : syms.errType);
1680 }
1681 super.visitYield(brk);
1682 }
1683
1684 @Override public void visitClassDef(JCClassDecl tree) {}
1685 @Override public void visitLambda(JCLambda tree) {}
1686 }.scan(c.stats);
1687 });
1688
1689 if (tree.cases.isEmpty()) {
1690 log.error(tree.pos(),
1691 Errors.SwitchExpressionEmpty);
1692 } else if (caseTypes.isEmpty()) {
1693 log.error(tree.pos(),
1694 Errors.SwitchExpressionNoResultExpressions);
1695 }
1696
1697 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ? condType(caseTypePositions.toList(), caseTypes.toList()) : pt();
1698
1699 result = tree.type = wrongContext? types.createErrorType(pt()) : check(tree, owntype, KindSelector.VAL, resultInfo);
1700 }
1701 //where:
1702 CheckContext switchExpressionContext(CheckContext checkContext) {
1703 return new Check.NestedCheckContext(checkContext) {
1704 //this will use enclosing check context to check compatibility of
1705 //subexpression against target type; if we are in a method check context,
1706 //depending on whether boxing is allowed, we could have incompatibilities
1707 @Override
1708 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1709 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleTypeInSwitchExpression(details)));
1710 }
1711 };
1712 }
1713
1714 private void handleSwitch(JCTree switchTree,
1715 JCExpression selector,
1716 List<JCCase> cases,
1717 BiConsumer<JCCase, Env<AttrContext>> attribCase) {
1718 Type seltype = attribExpr(selector, env);
1719
1720 Env<AttrContext> switchEnv =
1721 env.dup(switchTree, env.info.dup(env.info.scope.dup()));
1722
1723 try {
1724 boolean enumSwitch = (seltype.tsym.flags() & Flags.ENUM) != 0;
1725 boolean stringSwitch = types.isSameType(seltype, syms.stringType);
1726 boolean booleanSwitch = types.isSameType(types.unboxedTypeOrType(seltype), syms.booleanType);
1727 boolean errorEnumSwitch = TreeInfo.isErrorEnumSwitch(selector, cases);
1728 boolean intSwitch = types.isAssignable(seltype, syms.intType);
1729 boolean patternSwitch;
1730 if (seltype.isPrimitive() && !intSwitch) {
1731 preview.checkSourceLevel(selector.pos(), Feature.PRIMITIVE_PATTERNS);
1732 patternSwitch = true;
1733 }
1734 if (!enumSwitch && !stringSwitch && !errorEnumSwitch &&
1735 !intSwitch) {
1736 preview.checkSourceLevel(selector.pos(), Feature.PATTERN_SWITCH);
1737 patternSwitch = true;
1738 } else {
1739 patternSwitch = cases.stream()
1740 .flatMap(c -> c.labels.stream())
1741 .anyMatch(l -> l.hasTag(PATTERNCASELABEL) ||
1742 TreeInfo.isNullCaseLabel(l));
1743 }
1744
1745 // Attribute all cases and
1746 // check that there are no duplicate case labels or default clauses.
1747 Set<Object> constants = new HashSet<>(); // The set of case constants.
1748 boolean hasDefault = false; // Is there a default label?
1749 boolean hasUnconditionalPattern = false; // Is there a unconditional pattern?
1750 boolean lastPatternErroneous = false; // Has the last pattern erroneous type?
1751 boolean hasNullPattern = false; // Is there a null pattern?
1752 CaseTree.CaseKind caseKind = null;
1753 boolean wasError = false;
1754 JCCaseLabel unconditionalCaseLabel = null;
1755 for (List<JCCase> l = cases; l.nonEmpty(); l = l.tail) {
1756 JCCase c = l.head;
1757 if (caseKind == null) {
1758 caseKind = c.caseKind;
1759 } else if (caseKind != c.caseKind && !wasError) {
1760 log.error(c.pos(),
1761 Errors.SwitchMixingCaseTypes);
1762 wasError = true;
1763 }
1764 MatchBindings currentBindings = null;
1765 MatchBindings guardBindings = null;
1766 for (List<JCCaseLabel> labels = c.labels; labels.nonEmpty(); labels = labels.tail) {
1767 JCCaseLabel label = labels.head;
1768 if (label instanceof JCConstantCaseLabel constLabel) {
1769 JCExpression expr = constLabel.expr;
1770 if (TreeInfo.isNull(expr)) {
1771 preview.checkSourceLevel(expr.pos(), Feature.CASE_NULL);
1772 if (hasNullPattern) {
1773 log.error(label.pos(), Errors.DuplicateCaseLabel);
1774 }
1775 hasNullPattern = true;
1776 attribExpr(expr, switchEnv, seltype);
1777 matchBindings = new MatchBindings(matchBindings.bindingsWhenTrue, matchBindings.bindingsWhenFalse, true);
1778 } else if (enumSwitch) {
1779 Symbol sym = enumConstant(expr, seltype);
1780 if (sym == null) {
1781 if (allowPatternSwitch) {
1782 attribTree(expr, switchEnv, caseLabelResultInfo(seltype));
1783 Symbol enumSym = TreeInfo.symbol(expr);
1784 if (enumSym == null || !enumSym.isEnum() || enumSym.kind != VAR) {
1785 log.error(expr.pos(), Errors.EnumLabelMustBeEnumConstant);
1786 } else if (!constants.add(enumSym)) {
1787 log.error(label.pos(), Errors.DuplicateCaseLabel);
1788 }
1789 } else {
1790 log.error(expr.pos(), Errors.EnumLabelMustBeUnqualifiedEnum);
1791 }
1792 } else if (!constants.add(sym)) {
1793 log.error(label.pos(), Errors.DuplicateCaseLabel);
1794 }
1795 } else if (errorEnumSwitch) {
1796 //error recovery: the selector is erroneous, and all the case labels
1797 //are identifiers. This could be an enum switch - don't report resolve
1798 //error for the case label:
1799 var prevResolveHelper = rs.basicLogResolveHelper;
1800 try {
1801 rs.basicLogResolveHelper = rs.silentLogResolveHelper;
1802 attribExpr(expr, switchEnv, seltype);
1803 } finally {
1804 rs.basicLogResolveHelper = prevResolveHelper;
1805 }
1806 } else {
1807 Type pattype = attribTree(expr, switchEnv, caseLabelResultInfo(seltype));
1808 if (!pattype.hasTag(ERROR)) {
1809 if (pattype.constValue() == null) {
1810 Symbol s = TreeInfo.symbol(expr);
1811 if (s != null && s.kind == TYP) {
1812 log.error(expr.pos(),
1813 Errors.PatternExpected);
1814 } else if (s == null || !s.isEnum()) {
1815 log.error(expr.pos(),
1816 (stringSwitch ? Errors.StringConstReq
1817 : intSwitch ? Errors.ConstExprReq
1818 : Errors.PatternOrEnumReq));
1819 } else if (!constants.add(s)) {
1820 log.error(label.pos(), Errors.DuplicateCaseLabel);
1821 }
1822 }
1823 else {
1824 if (!stringSwitch && !intSwitch &&
1825 !((pattype.getTag().isInSuperClassesOf(LONG) || pattype.getTag().equals(BOOLEAN)) &&
1826 types.isSameType(types.unboxedTypeOrType(seltype), pattype))) {
1827 log.error(label.pos(), Errors.ConstantLabelNotCompatible(pattype, seltype));
1828 } else if (!constants.add(pattype.constValue())) {
1829 log.error(c.pos(), Errors.DuplicateCaseLabel);
1830 }
1831 }
1832 }
1833 }
1834 } else if (label instanceof JCDefaultCaseLabel def) {
1835 if (hasDefault) {
1836 log.error(label.pos(), Errors.DuplicateDefaultLabel);
1837 } else if (hasUnconditionalPattern) {
1838 log.error(label.pos(), Errors.UnconditionalPatternAndDefault);
1839 } else if (booleanSwitch && constants.containsAll(Set.of(0, 1))) {
1840 log.error(label.pos(), Errors.DefaultAndBothBooleanValues);
1841 }
1842 hasDefault = true;
1843 matchBindings = MatchBindingsComputer.EMPTY;
1844 } else if (label instanceof JCPatternCaseLabel patternlabel) {
1845 //pattern
1846 JCPattern pat = patternlabel.pat;
1847 attribExpr(pat, switchEnv, seltype);
1848 Type primaryType = TreeInfo.primaryPatternType(pat);
1849
1850 if (primaryType.isPrimitive()) {
1851 preview.checkSourceLevel(pat.pos(), Feature.PRIMITIVE_PATTERNS);
1852 } else if (!primaryType.hasTag(TYPEVAR)) {
1853 primaryType = chk.checkClassOrArrayType(pat.pos(), primaryType);
1854 }
1855 checkCastablePattern(pat.pos(), seltype, primaryType);
1856 Type patternType = types.erasure(primaryType);
1857 JCExpression guard = c.guard;
1858 if (guardBindings == null && guard != null) {
1859 MatchBindings afterPattern = matchBindings;
1860 Env<AttrContext> bodyEnv = bindingEnv(switchEnv, matchBindings.bindingsWhenTrue);
1861 try {
1862 attribExpr(guard, bodyEnv, syms.booleanType);
1863 } finally {
1864 bodyEnv.info.scope.leave();
1865 }
1866
1867 guardBindings = matchBindings;
1868 matchBindings = afterPattern;
1869
1870 if (TreeInfo.isBooleanWithValue(guard, 0)) {
1871 log.error(guard.pos(), Errors.GuardHasConstantExpressionFalse);
1872 }
1873 }
1874 boolean unguarded = TreeInfo.unguardedCase(c) && !pat.hasTag(RECORDPATTERN);
1875 boolean unconditional =
1876 unguarded &&
1877 !patternType.isErroneous() &&
1878 types.isUnconditionallyExact(seltype, patternType);
1879 if (unconditional) {
1880 if (hasUnconditionalPattern) {
1881 log.error(pat.pos(), Errors.DuplicateUnconditionalPattern);
1882 } else if (hasDefault) {
1883 log.error(pat.pos(), Errors.UnconditionalPatternAndDefault);
1884 } else if (booleanSwitch && constants.containsAll(Set.of(0, 1))) {
1885 log.error(pat.pos(), Errors.UnconditionalPatternAndBothBooleanValues);
1886 }
1887 hasUnconditionalPattern = true;
1888 unconditionalCaseLabel = label;
1889 }
1890 lastPatternErroneous = patternType.isErroneous();
1891 } else {
1892 Assert.error();
1893 }
1894 currentBindings = matchBindingsComputer.switchCase(label, currentBindings, matchBindings);
1895 }
1896
1897 if (guardBindings != null) {
1898 currentBindings = matchBindingsComputer.caseGuard(c, currentBindings, guardBindings);
1899 }
1900
1901 Env<AttrContext> caseEnv =
1902 bindingEnv(switchEnv, c, currentBindings.bindingsWhenTrue);
1903 try {
1904 attribCase.accept(c, caseEnv);
1905 } finally {
1906 caseEnv.info.scope.leave();
1907 }
1908 addVars(c.stats, switchEnv.info.scope);
1909
1910 preFlow(c);
1911 c.completesNormally = flow.aliveAfter(caseEnv, c, make);
1912 }
1913 if (patternSwitch) {
1914 chk.checkSwitchCaseStructure(cases);
1915 chk.checkSwitchCaseLabelDominated(unconditionalCaseLabel, cases);
1916 }
1917 if (switchTree.hasTag(SWITCH)) {
1918 ((JCSwitch) switchTree).hasUnconditionalPattern =
1919 hasDefault || hasUnconditionalPattern || lastPatternErroneous;
1920 ((JCSwitch) switchTree).patternSwitch = patternSwitch;
1921 } else if (switchTree.hasTag(SWITCH_EXPRESSION)) {
1922 ((JCSwitchExpression) switchTree).hasUnconditionalPattern =
1923 hasDefault || hasUnconditionalPattern || lastPatternErroneous;
1924 ((JCSwitchExpression) switchTree).patternSwitch = patternSwitch;
1925 } else {
1926 Assert.error(switchTree.getTag().name());
1927 }
1928 } finally {
1929 switchEnv.info.scope.leave();
1930 }
1931 }
1932 // where
1933 private ResultInfo caseLabelResultInfo(Type seltype) {
1934 return new ResultInfo(KindSelector.VAL_TYP,
1935 !seltype.hasTag(ERROR) ? seltype
1936 : Type.noType);
1937 }
1938 /** Add any variables defined in stats to the switch scope. */
1939 private static void addVars(List<JCStatement> stats, WriteableScope switchScope) {
1940 for (;stats.nonEmpty(); stats = stats.tail) {
1941 JCTree stat = stats.head;
1942 if (stat.hasTag(VARDEF))
1943 switchScope.enter(((JCVariableDecl) stat).sym);
1944 }
1945 }
1946 // where
1947 /** Return the selected enumeration constant symbol, or null. */
1948 private Symbol enumConstant(JCTree tree, Type enumType) {
1949 if (tree.hasTag(IDENT)) {
1950 JCIdent ident = (JCIdent)tree;
1951 Name name = ident.name;
1952 for (Symbol sym : enumType.tsym.members().getSymbolsByName(name)) {
1953 if (sym.kind == VAR) {
1954 Symbol s = ident.sym = sym;
1955 ((VarSymbol)s).getConstValue(); // ensure initializer is evaluated
1956 ident.type = s.type;
1957 return ((s.flags_field & Flags.ENUM) == 0)
1958 ? null : s;
1959 }
1960 }
1961 }
1962 return null;
1963 }
1964
1965 public void visitSynchronized(JCSynchronized tree) {
1966 chk.checkRefType(tree.pos(), attribExpr(tree.lock, env));
1967 if (isValueBased(tree.lock.type)) {
1968 env.info.lint.logIfEnabled(tree.pos(), LintWarnings.AttemptToSynchronizeOnInstanceOfValueBasedClass);
1969 }
1970 attribStat(tree.body, env);
1971 result = null;
1972 }
1973 // where
1974 private boolean isValueBased(Type t) {
1975 return t != null && t.tsym != null && (t.tsym.flags() & VALUE_BASED) != 0;
1976 }
1977
1978
1979 public void visitTry(JCTry tree) {
1980 // Create a new local environment with a local
1981 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
1982 try {
1983 boolean isTryWithResource = tree.resources.nonEmpty();
1984 // Create a nested environment for attributing the try block if needed
1985 Env<AttrContext> tryEnv = isTryWithResource ?
1986 env.dup(tree, localEnv.info.dup(localEnv.info.scope.dup())) :
1987 localEnv;
1988 try {
1989 // Attribute resource declarations
1990 for (JCTree resource : tree.resources) {
1991 CheckContext twrContext = new Check.NestedCheckContext(resultInfo.checkContext) {
1992 @Override
1993 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1994 chk.basicHandler.report(pos, diags.fragment(Fragments.TryNotApplicableToType(details)));
1995 }
1996 };
1997 ResultInfo twrResult =
1998 new ResultInfo(KindSelector.VAR,
1999 syms.autoCloseableType,
2000 twrContext);
2001 if (resource.hasTag(VARDEF)) {
2002 attribStat(resource, tryEnv);
2003 twrResult.check(resource, resource.type);
2004
2005 //check that resource type cannot throw InterruptedException
2006 checkAutoCloseable(resource.pos(), localEnv, resource.type);
2007
2008 VarSymbol var = ((JCVariableDecl) resource).sym;
2009
2010 var.flags_field |= Flags.FINAL;
2011 var.setData(ElementKind.RESOURCE_VARIABLE);
2012 } else {
2013 attribTree(resource, tryEnv, twrResult);
2014 }
2015 }
2016 // Attribute body
2017 attribStat(tree.body, tryEnv);
2018 } finally {
2019 if (isTryWithResource)
2020 tryEnv.info.scope.leave();
2021 }
2022
2023 // Attribute catch clauses
2024 for (List<JCCatch> l = tree.catchers; l.nonEmpty(); l = l.tail) {
2025 JCCatch c = l.head;
2026 Env<AttrContext> catchEnv =
2027 localEnv.dup(c, localEnv.info.dup(localEnv.info.scope.dup()));
2028 try {
2029 Type ctype = attribStat(c.param, catchEnv);
2030 if (TreeInfo.isMultiCatch(c)) {
2031 //multi-catch parameter is implicitly marked as final
2032 c.param.sym.flags_field |= FINAL | UNION;
2033 }
2034 if (c.param.sym.kind == VAR) {
2035 c.param.sym.setData(ElementKind.EXCEPTION_PARAMETER);
2036 }
2037 chk.checkType(c.param.vartype.pos(),
2038 chk.checkClassType(c.param.vartype.pos(), ctype),
2039 syms.throwableType);
2040 attribStat(c.body, catchEnv);
2041 } finally {
2042 catchEnv.info.scope.leave();
2043 }
2044 }
2045
2046 // Attribute finalizer
2047 if (tree.finalizer != null) attribStat(tree.finalizer, localEnv);
2048 result = null;
2049 }
2050 finally {
2051 localEnv.info.scope.leave();
2052 }
2053 }
2054
2055 void checkAutoCloseable(DiagnosticPosition pos, Env<AttrContext> env, Type resource) {
2056 if (!resource.isErroneous() &&
2057 types.asSuper(resource, syms.autoCloseableType.tsym) != null &&
2058 !types.isSameType(resource, syms.autoCloseableType)) { // Don't emit warning for AutoCloseable itself
2059 Symbol close = syms.noSymbol;
2060 Log.DiagnosticHandler discardHandler = log.new DiscardDiagnosticHandler();
2061 try {
2062 close = rs.resolveQualifiedMethod(pos,
2063 env,
2064 types.skipTypeVars(resource, false),
2065 names.close,
2066 List.nil(),
2067 List.nil());
2068 }
2069 finally {
2070 log.popDiagnosticHandler(discardHandler);
2071 }
2072 if (close.kind == MTH &&
2073 close.overrides(syms.autoCloseableClose, resource.tsym, types, true) &&
2074 chk.isHandled(syms.interruptedExceptionType, types.memberType(resource, close).getThrownTypes())) {
2075 env.info.lint.logIfEnabled(pos, LintWarnings.TryResourceThrowsInterruptedExc(resource));
2076 }
2077 }
2078 }
2079
2080 public void visitConditional(JCConditional tree) {
2081 Type condtype = attribExpr(tree.cond, env, syms.booleanType);
2082 MatchBindings condBindings = matchBindings;
2083
2084 tree.polyKind = (pt().hasTag(NONE) && pt() != Type.recoveryType && pt() != Infer.anyPoly ||
2085 isBooleanOrNumeric(env, tree)) ?
2086 PolyKind.STANDALONE : PolyKind.POLY;
2087
2088 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) {
2089 //this means we are returning a poly conditional from void-compatible lambda expression
2090 resultInfo.checkContext.report(tree, diags.fragment(Fragments.ConditionalTargetCantBeVoid));
2091 result = tree.type = types.createErrorType(resultInfo.pt);
2092 return;
2093 }
2094
2095 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ?
2096 unknownExprInfo :
2097 resultInfo.dup(conditionalContext(resultInfo.checkContext));
2098
2099
2100 // x ? y : z
2101 // include x's bindings when true in y
2102 // include x's bindings when false in z
2103
2104 Type truetype;
2105 Env<AttrContext> trueEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
2106 try {
2107 truetype = attribTree(tree.truepart, trueEnv, condInfo);
2108 } finally {
2109 trueEnv.info.scope.leave();
2110 }
2111
2112 MatchBindings trueBindings = matchBindings;
2113
2114 Type falsetype;
2115 Env<AttrContext> falseEnv = bindingEnv(env, condBindings.bindingsWhenFalse);
2116 try {
2117 falsetype = attribTree(tree.falsepart, falseEnv, condInfo);
2118 } finally {
2119 falseEnv.info.scope.leave();
2120 }
2121
2122 MatchBindings falseBindings = matchBindings;
2123
2124 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ?
2125 condType(List.of(tree.truepart.pos(), tree.falsepart.pos()),
2126 List.of(truetype, falsetype)) : pt();
2127 if (condtype.constValue() != null &&
2128 truetype.constValue() != null &&
2129 falsetype.constValue() != null &&
2130 !owntype.hasTag(NONE)) {
2131 //constant folding
2132 owntype = cfolder.coerce(condtype.isTrue() ? truetype : falsetype, owntype);
2133 }
2134 result = check(tree, owntype, KindSelector.VAL, resultInfo);
2135 matchBindings = matchBindingsComputer.conditional(tree, condBindings, trueBindings, falseBindings);
2136 }
2137 //where
2138 private boolean isBooleanOrNumeric(Env<AttrContext> env, JCExpression tree) {
2139 switch (tree.getTag()) {
2140 case LITERAL: return ((JCLiteral)tree).typetag.isSubRangeOf(DOUBLE) ||
2141 ((JCLiteral)tree).typetag == BOOLEAN ||
2142 ((JCLiteral)tree).typetag == BOT;
2143 case LAMBDA: case REFERENCE: return false;
2144 case PARENS: return isBooleanOrNumeric(env, ((JCParens)tree).expr);
2145 case CONDEXPR:
2146 JCConditional condTree = (JCConditional)tree;
2147 return isBooleanOrNumeric(env, condTree.truepart) &&
2148 isBooleanOrNumeric(env, condTree.falsepart);
2149 case APPLY:
2150 JCMethodInvocation speculativeMethodTree =
2151 (JCMethodInvocation)deferredAttr.attribSpeculative(
2152 tree, env, unknownExprInfo,
2153 argumentAttr.withLocalCacheContext());
2154 Symbol msym = TreeInfo.symbol(speculativeMethodTree.meth);
2155 Type receiverType = speculativeMethodTree.meth.hasTag(IDENT) ?
2156 env.enclClass.type :
2157 ((JCFieldAccess)speculativeMethodTree.meth).selected.type;
2158 Type owntype = types.memberType(receiverType, msym).getReturnType();
2159 return primitiveOrBoxed(owntype);
2160 case NEWCLASS:
2161 JCExpression className =
2162 removeClassParams.translate(((JCNewClass)tree).clazz);
2163 JCExpression speculativeNewClassTree =
2164 (JCExpression)deferredAttr.attribSpeculative(
2165 className, env, unknownTypeInfo,
2166 argumentAttr.withLocalCacheContext());
2167 return primitiveOrBoxed(speculativeNewClassTree.type);
2168 default:
2169 Type speculativeType = deferredAttr.attribSpeculative(tree, env, unknownExprInfo,
2170 argumentAttr.withLocalCacheContext()).type;
2171 return primitiveOrBoxed(speculativeType);
2172 }
2173 }
2174 //where
2175 boolean primitiveOrBoxed(Type t) {
2176 return (!t.hasTag(TYPEVAR) && !t.isErroneous() && types.unboxedTypeOrType(t).isPrimitive());
2177 }
2178
2179 TreeTranslator removeClassParams = new TreeTranslator() {
2180 @Override
2181 public void visitTypeApply(JCTypeApply tree) {
2182 result = translate(tree.clazz);
2183 }
2184 };
2185
2186 CheckContext conditionalContext(CheckContext checkContext) {
2187 return new Check.NestedCheckContext(checkContext) {
2188 //this will use enclosing check context to check compatibility of
2189 //subexpression against target type; if we are in a method check context,
2190 //depending on whether boxing is allowed, we could have incompatibilities
2191 @Override
2192 public void report(DiagnosticPosition pos, JCDiagnostic details) {
2193 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleTypeInConditional(details)));
2194 }
2195 };
2196 }
2197
2198 /** Compute the type of a conditional expression, after
2199 * checking that it exists. See JLS 15.25. Does not take into
2200 * account the special case where condition and both arms
2201 * are constants.
2202 *
2203 * @param pos The source position to be used for error
2204 * diagnostics.
2205 * @param thentype The type of the expression's then-part.
2206 * @param elsetype The type of the expression's else-part.
2207 */
2208 Type condType(List<DiagnosticPosition> positions, List<Type> condTypes) {
2209 if (condTypes.isEmpty()) {
2210 return syms.objectType; //TODO: how to handle?
2211 }
2212 Type first = condTypes.head;
2213 // If same type, that is the result
2214 if (condTypes.tail.stream().allMatch(t -> types.isSameType(first, t)))
2215 return first.baseType();
2216
2217 List<Type> unboxedTypes = condTypes.stream()
2218 .map(t -> t.isPrimitive() ? t : types.unboxedType(t))
2219 .collect(List.collector());
2220
2221 // Otherwise, if both arms can be converted to a numeric
2222 // type, return the least numeric type that fits both arms
2223 // (i.e. return larger of the two, or return int if one
2224 // arm is short, the other is char).
2225 if (unboxedTypes.stream().allMatch(t -> t.isPrimitive())) {
2226 // If one arm has an integer subrange type (i.e., byte,
2227 // short, or char), and the other is an integer constant
2228 // that fits into the subrange, return the subrange type.
2229 for (Type type : unboxedTypes) {
2230 if (!type.getTag().isStrictSubRangeOf(INT)) {
2231 continue;
2232 }
2233 if (unboxedTypes.stream().filter(t -> t != type).allMatch(t -> t.hasTag(INT) && types.isAssignable(t, type)))
2234 return type.baseType();
2235 }
2236
2237 for (TypeTag tag : primitiveTags) {
2238 Type candidate = syms.typeOfTag[tag.ordinal()];
2239 if (unboxedTypes.stream().allMatch(t -> types.isSubtype(t, candidate))) {
2240 return candidate;
2241 }
2242 }
2243 }
2244
2245 // Those were all the cases that could result in a primitive
2246 condTypes = condTypes.stream()
2247 .map(t -> t.isPrimitive() ? types.boxedClass(t).type : t)
2248 .collect(List.collector());
2249
2250 for (Type type : condTypes) {
2251 if (condTypes.stream().filter(t -> t != type).allMatch(t -> types.isAssignable(t, type)))
2252 return type.baseType();
2253 }
2254
2255 Iterator<DiagnosticPosition> posIt = positions.iterator();
2256
2257 condTypes = condTypes.stream()
2258 .map(t -> chk.checkNonVoid(posIt.next(), t))
2259 .collect(List.collector());
2260
2261 // both are known to be reference types. The result is
2262 // lub(thentype,elsetype). This cannot fail, as it will
2263 // always be possible to infer "Object" if nothing better.
2264 return types.lub(condTypes.stream()
2265 .map(t -> t.baseType())
2266 .filter(t -> !t.hasTag(BOT))
2267 .collect(List.collector()));
2268 }
2269
2270 static final TypeTag[] primitiveTags = new TypeTag[]{
2271 BYTE,
2272 CHAR,
2273 SHORT,
2274 INT,
2275 LONG,
2276 FLOAT,
2277 DOUBLE,
2278 BOOLEAN,
2279 };
2280
2281 Env<AttrContext> bindingEnv(Env<AttrContext> env, List<BindingSymbol> bindings) {
2282 return bindingEnv(env, env.tree, bindings);
2283 }
2284
2285 Env<AttrContext> bindingEnv(Env<AttrContext> env, JCTree newTree, List<BindingSymbol> bindings) {
2286 Env<AttrContext> env1 = env.dup(newTree, env.info.dup(env.info.scope.dup()));
2287 bindings.forEach(env1.info.scope::enter);
2288 return env1;
2289 }
2290
2291 public void visitIf(JCIf tree) {
2292 attribExpr(tree.cond, env, syms.booleanType);
2293
2294 // if (x) { y } [ else z ]
2295 // include x's bindings when true in y
2296 // include x's bindings when false in z
2297
2298 MatchBindings condBindings = matchBindings;
2299 Env<AttrContext> thenEnv = bindingEnv(env, condBindings.bindingsWhenTrue);
2300
2301 try {
2302 attribStat(tree.thenpart, thenEnv);
2303 } finally {
2304 thenEnv.info.scope.leave();
2305 }
2306
2307 preFlow(tree.thenpart);
2308 boolean aliveAfterThen = flow.aliveAfter(env, tree.thenpart, make);
2309 boolean aliveAfterElse;
2310
2311 if (tree.elsepart != null) {
2312 Env<AttrContext> elseEnv = bindingEnv(env, condBindings.bindingsWhenFalse);
2313 try {
2314 attribStat(tree.elsepart, elseEnv);
2315 } finally {
2316 elseEnv.info.scope.leave();
2317 }
2318 preFlow(tree.elsepart);
2319 aliveAfterElse = flow.aliveAfter(env, tree.elsepart, make);
2320 } else {
2321 aliveAfterElse = true;
2322 }
2323
2324 chk.checkEmptyIf(tree);
2325
2326 List<BindingSymbol> afterIfBindings = List.nil();
2327
2328 if (aliveAfterThen && !aliveAfterElse) {
2329 afterIfBindings = condBindings.bindingsWhenTrue;
2330 } else if (aliveAfterElse && !aliveAfterThen) {
2331 afterIfBindings = condBindings.bindingsWhenFalse;
2332 }
2333
2334 addBindings2Scope(tree, afterIfBindings);
2335
2336 result = null;
2337 }
2338
2339 void preFlow(JCTree tree) {
2340 attrRecover.doRecovery();
2341 new PostAttrAnalyzer() {
2342 @Override
2343 public void scan(JCTree tree) {
2344 if (tree == null ||
2345 (tree.type != null &&
2346 tree.type == Type.stuckType)) {
2347 //don't touch stuck expressions!
2348 return;
2349 }
2350 super.scan(tree);
2351 }
2352
2353 @Override
2354 public void visitClassDef(JCClassDecl that) {
2355 if (that.sym != null) {
2356 // Method preFlow shouldn't visit class definitions
2357 // that have not been entered and attributed.
2358 // See JDK-8254557 and JDK-8203277 for more details.
2359 super.visitClassDef(that);
2360 }
2361 }
2362
2363 @Override
2364 public void visitLambda(JCLambda that) {
2365 if (that.type != null) {
2366 // Method preFlow shouldn't visit lambda expressions
2367 // that have not been entered and attributed.
2368 // See JDK-8254557 and JDK-8203277 for more details.
2369 super.visitLambda(that);
2370 }
2371 }
2372 }.scan(tree);
2373 }
2374
2375 public void visitExec(JCExpressionStatement tree) {
2376 //a fresh environment is required for 292 inference to work properly ---
2377 //see Infer.instantiatePolymorphicSignatureInstance()
2378 Env<AttrContext> localEnv = env.dup(tree);
2379 attribExpr(tree.expr, localEnv);
2380 result = null;
2381 }
2382
2383 public void visitBreak(JCBreak tree) {
2384 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
2385 result = null;
2386 }
2387
2388 public void visitYield(JCYield tree) {
2389 if (env.info.yieldResult != null) {
2390 attribTree(tree.value, env, env.info.yieldResult);
2391 tree.target = findJumpTarget(tree.pos(), tree.getTag(), names.empty, env);
2392 } else {
2393 log.error(tree.pos(), tree.value.hasTag(PARENS)
2394 ? Errors.NoSwitchExpressionQualify
2395 : Errors.NoSwitchExpression);
2396 attribTree(tree.value, env, unknownExprInfo);
2397 }
2398 result = null;
2399 }
2400
2401 public void visitContinue(JCContinue tree) {
2402 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
2403 result = null;
2404 }
2405 //where
2406 /** Return the target of a break, continue or yield statement,
2407 * if it exists, report an error if not.
2408 * Note: The target of a labelled break or continue is the
2409 * (non-labelled) statement tree referred to by the label,
2410 * not the tree representing the labelled statement itself.
2411 *
2412 * @param pos The position to be used for error diagnostics
2413 * @param tag The tag of the jump statement. This is either
2414 * Tree.BREAK or Tree.CONTINUE.
2415 * @param label The label of the jump statement, or null if no
2416 * label is given.
2417 * @param env The environment current at the jump statement.
2418 */
2419 private JCTree findJumpTarget(DiagnosticPosition pos,
2420 JCTree.Tag tag,
2421 Name label,
2422 Env<AttrContext> env) {
2423 Pair<JCTree, Error> jumpTarget = findJumpTargetNoError(tag, label, env);
2424
2425 if (jumpTarget.snd != null) {
2426 log.error(pos, jumpTarget.snd);
2427 }
2428
2429 return jumpTarget.fst;
2430 }
2431 /** Return the target of a break or continue statement, if it exists,
2432 * report an error if not.
2433 * Note: The target of a labelled break or continue is the
2434 * (non-labelled) statement tree referred to by the label,
2435 * not the tree representing the labelled statement itself.
2436 *
2437 * @param tag The tag of the jump statement. This is either
2438 * Tree.BREAK or Tree.CONTINUE.
2439 * @param label The label of the jump statement, or null if no
2440 * label is given.
2441 * @param env The environment current at the jump statement.
2442 */
2443 private Pair<JCTree, JCDiagnostic.Error> findJumpTargetNoError(JCTree.Tag tag,
2444 Name label,
2445 Env<AttrContext> env) {
2446 // Search environments outwards from the point of jump.
2447 Env<AttrContext> env1 = env;
2448 JCDiagnostic.Error pendingError = null;
2449 LOOP:
2450 while (env1 != null) {
2451 switch (env1.tree.getTag()) {
2452 case LABELLED:
2453 JCLabeledStatement labelled = (JCLabeledStatement)env1.tree;
2454 if (label == labelled.label) {
2455 // If jump is a continue, check that target is a loop.
2456 if (tag == CONTINUE) {
2457 if (!labelled.body.hasTag(DOLOOP) &&
2458 !labelled.body.hasTag(WHILELOOP) &&
2459 !labelled.body.hasTag(FORLOOP) &&
2460 !labelled.body.hasTag(FOREACHLOOP)) {
2461 pendingError = Errors.NotLoopLabel(label);
2462 }
2463 // Found labelled statement target, now go inwards
2464 // to next non-labelled tree.
2465 return Pair.of(TreeInfo.referencedStatement(labelled), pendingError);
2466 } else {
2467 return Pair.of(labelled, pendingError);
2468 }
2469 }
2470 break;
2471 case DOLOOP:
2472 case WHILELOOP:
2473 case FORLOOP:
2474 case FOREACHLOOP:
2475 if (label == null) return Pair.of(env1.tree, pendingError);
2476 break;
2477 case SWITCH:
2478 if (label == null && tag == BREAK) return Pair.of(env1.tree, null);
2479 break;
2480 case SWITCH_EXPRESSION:
2481 if (tag == YIELD) {
2482 return Pair.of(env1.tree, null);
2483 } else if (tag == BREAK) {
2484 pendingError = Errors.BreakOutsideSwitchExpression;
2485 } else {
2486 pendingError = Errors.ContinueOutsideSwitchExpression;
2487 }
2488 break;
2489 case LAMBDA:
2490 case METHODDEF:
2491 case CLASSDEF:
2492 break LOOP;
2493 default:
2494 }
2495 env1 = env1.next;
2496 }
2497 if (label != null)
2498 return Pair.of(null, Errors.UndefLabel(label));
2499 else if (pendingError != null)
2500 return Pair.of(null, pendingError);
2501 else if (tag == CONTINUE)
2502 return Pair.of(null, Errors.ContOutsideLoop);
2503 else
2504 return Pair.of(null, Errors.BreakOutsideSwitchLoop);
2505 }
2506
2507 public void visitReturn(JCReturn tree) {
2508 // Check that there is an enclosing method which is
2509 // nested within than the enclosing class.
2510 if (env.info.returnResult == null) {
2511 log.error(tree.pos(), Errors.RetOutsideMeth);
2512 } else if (env.info.yieldResult != null) {
2513 log.error(tree.pos(), Errors.ReturnOutsideSwitchExpression);
2514 if (tree.expr != null) {
2515 attribExpr(tree.expr, env, env.info.yieldResult.pt);
2516 }
2517 } else if (!env.info.isLambda &&
2518 env.enclMethod != null &&
2519 TreeInfo.isCompactConstructor(env.enclMethod)) {
2520 log.error(env.enclMethod,
2521 Errors.InvalidCanonicalConstructorInRecord(Fragments.Compact, env.enclMethod.sym.name, Fragments.CanonicalCantHaveReturnStatement));
2522 } else {
2523 // Attribute return expression, if it exists, and check that
2524 // it conforms to result type of enclosing method.
2525 if (tree.expr != null) {
2526 if (env.info.returnResult.pt.hasTag(VOID)) {
2527 env.info.returnResult.checkContext.report(tree.expr.pos(),
2528 diags.fragment(Fragments.UnexpectedRetVal));
2529 }
2530 attribTree(tree.expr, env, env.info.returnResult);
2531 } else if (!env.info.returnResult.pt.hasTag(VOID) &&
2532 !env.info.returnResult.pt.hasTag(NONE)) {
2533 env.info.returnResult.checkContext.report(tree.pos(),
2534 diags.fragment(Fragments.MissingRetVal(env.info.returnResult.pt)));
2535 }
2536 }
2537 result = null;
2538 }
2539
2540 public void visitThrow(JCThrow tree) {
2541 Type owntype = attribExpr(tree.expr, env, Type.noType);
2542 chk.checkType(tree, owntype, syms.throwableType);
2543 result = null;
2544 }
2545
2546 public void visitAssert(JCAssert tree) {
2547 attribExpr(tree.cond, env, syms.booleanType);
2548 if (tree.detail != null) {
2549 chk.checkNonVoid(tree.detail.pos(), attribExpr(tree.detail, env));
2550 }
2551 result = null;
2552 }
2553
2554 /** Visitor method for method invocations.
2555 * NOTE: The method part of an application will have in its type field
2556 * the return type of the method, not the method's type itself!
2557 */
2558 public void visitApply(JCMethodInvocation tree) {
2559 // The local environment of a method application is
2560 // a new environment nested in the current one.
2561 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
2562
2563 // The types of the actual method arguments.
2564 List<Type> argtypes;
2565
2566 // The types of the actual method type arguments.
2567 List<Type> typeargtypes = null;
2568
2569 Name methName = TreeInfo.name(tree.meth);
2570
2571 boolean isConstructorCall =
2572 methName == names._this || methName == names._super;
2573
2574 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
2575 if (isConstructorCall) {
2576
2577 // Attribute arguments, yielding list of argument types.
2578 KindSelector kind = attribArgs(KindSelector.MTH, tree.args, localEnv, argtypesBuf);
2579 argtypes = argtypesBuf.toList();
2580 typeargtypes = attribTypes(tree.typeargs, localEnv);
2581
2582 // Done with this()/super() parameters. End of constructor prologue.
2583 env.info.ctorPrologue = false;
2584
2585 // Variable `site' points to the class in which the called
2586 // constructor is defined.
2587 Type site = env.enclClass.sym.type;
2588 if (methName == names._super) {
2589 if (site == syms.objectType) {
2590 log.error(tree.meth.pos(), Errors.NoSuperclass(site));
2591 site = types.createErrorType(syms.objectType);
2592 } else {
2593 site = types.supertype(site);
2594 }
2595 }
2596
2597 if (site.hasTag(CLASS)) {
2598 Type encl = site.getEnclosingType();
2599 while (encl != null && encl.hasTag(TYPEVAR))
2600 encl = encl.getUpperBound();
2601 if (encl.hasTag(CLASS)) {
2602 // we are calling a nested class
2603
2604 if (tree.meth.hasTag(SELECT)) {
2605 JCTree qualifier = ((JCFieldAccess) tree.meth).selected;
2606
2607 // We are seeing a prefixed call, of the form
2608 // <expr>.super(...).
2609 // Check that the prefix expression conforms
2610 // to the outer instance type of the class.
2611 chk.checkRefType(qualifier.pos(),
2612 attribExpr(qualifier, localEnv,
2613 encl));
2614 }
2615 } else if (tree.meth.hasTag(SELECT)) {
2616 log.error(tree.meth.pos(),
2617 Errors.IllegalQualNotIcls(site.tsym));
2618 attribExpr(((JCFieldAccess) tree.meth).selected, localEnv, site);
2619 }
2620
2621 if (tree.meth.hasTag(IDENT)) {
2622 // non-qualified super(...) call; check whether explicit constructor
2623 // invocation is well-formed. If the super class is an inner class,
2624 // make sure that an appropriate implicit qualifier exists. If the super
2625 // class is a local class, make sure that the current class is defined
2626 // in the same context as the local class.
2627 checkNewInnerClass(tree.meth.pos(), localEnv, site, true);
2628 }
2629
2630 // if we're calling a java.lang.Enum constructor,
2631 // prefix the implicit String and int parameters
2632 if (site.tsym == syms.enumSym)
2633 argtypes = argtypes.prepend(syms.intType).prepend(syms.stringType);
2634
2635 // Resolve the called constructor under the assumption
2636 // that we are referring to a superclass instance of the
2637 // current instance (JLS ???).
2638 boolean selectSuperPrev = localEnv.info.selectSuper;
2639 localEnv.info.selectSuper = true;
2640 localEnv.info.pendingResolutionPhase = null;
2641 Symbol sym = rs.resolveConstructor(
2642 tree.meth.pos(), localEnv, site, argtypes, typeargtypes);
2643 localEnv.info.selectSuper = selectSuperPrev;
2644
2645 // Set method symbol to resolved constructor...
2646 TreeInfo.setSymbol(tree.meth, sym);
2647
2648 // ...and check that it is legal in the current context.
2649 // (this will also set the tree's type)
2650 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
2651 checkId(tree.meth, site, sym, localEnv,
2652 new ResultInfo(kind, mpt));
2653 } else if (site.hasTag(ERROR) && tree.meth.hasTag(SELECT)) {
2654 attribExpr(((JCFieldAccess) tree.meth).selected, localEnv, site);
2655 }
2656 // Otherwise, `site' is an error type and we do nothing
2657 result = tree.type = syms.voidType;
2658 } else {
2659 // Otherwise, we are seeing a regular method call.
2660 // Attribute the arguments, yielding list of argument types, ...
2661 KindSelector kind = attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf);
2662 argtypes = argtypesBuf.toList();
2663 typeargtypes = attribAnyTypes(tree.typeargs, localEnv);
2664
2665 // ... and attribute the method using as a prototype a methodtype
2666 // whose formal argument types is exactly the list of actual
2667 // arguments (this will also set the method symbol).
2668 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
2669 localEnv.info.pendingResolutionPhase = null;
2670 Type mtype = attribTree(tree.meth, localEnv, new ResultInfo(kind, mpt, resultInfo.checkContext));
2671
2672 // Compute the result type.
2673 Type restype = mtype.getReturnType();
2674 if (restype.hasTag(WILDCARD))
2675 throw new AssertionError(mtype);
2676
2677 Type qualifier = (tree.meth.hasTag(SELECT))
2678 ? ((JCFieldAccess) tree.meth).selected.type
2679 : env.enclClass.sym.type;
2680 Symbol msym = TreeInfo.symbol(tree.meth);
2681 restype = adjustMethodReturnType(msym, qualifier, methName, argtypes, restype);
2682
2683 chk.checkRefTypes(tree.typeargs, typeargtypes);
2684
2685 // Check that value of resulting type is admissible in the
2686 // current context. Also, capture the return type
2687 Type capturedRes = resultInfo.checkContext.inferenceContext().cachedCapture(tree, restype, true);
2688 result = check(tree, capturedRes, KindSelector.VAL, resultInfo);
2689 }
2690 chk.validate(tree.typeargs, localEnv);
2691 }
2692 //where
2693 Type adjustMethodReturnType(Symbol msym, Type qualifierType, Name methodName, List<Type> argtypes, Type restype) {
2694 if (msym != null &&
2695 (msym.owner == syms.objectType.tsym || msym.owner.isInterface()) &&
2696 methodName == names.getClass &&
2697 argtypes.isEmpty()) {
2698 // as a special case, x.getClass() has type Class<? extends |X|>
2699 return new ClassType(restype.getEnclosingType(),
2700 List.of(new WildcardType(types.erasure(qualifierType.baseType()),
2701 BoundKind.EXTENDS,
2702 syms.boundClass)),
2703 restype.tsym,
2704 restype.getMetadata());
2705 } else if (msym != null &&
2706 msym.owner == syms.arrayClass &&
2707 methodName == names.clone &&
2708 types.isArray(qualifierType)) {
2709 // as a special case, array.clone() has a result that is
2710 // the same as static type of the array being cloned
2711 return qualifierType;
2712 } else {
2713 return restype;
2714 }
2715 }
2716
2717 /** Obtain a method type with given argument types.
2718 */
2719 Type newMethodTemplate(Type restype, List<Type> argtypes, List<Type> typeargtypes) {
2720 MethodType mt = new MethodType(argtypes, restype, List.nil(), syms.methodClass);
2721 return (typeargtypes == null) ? mt : (Type)new ForAll(typeargtypes, mt);
2722 }
2723
2724 public void visitNewClass(final JCNewClass tree) {
2725 Type owntype = types.createErrorType(tree.type);
2726
2727 // The local environment of a class creation is
2728 // a new environment nested in the current one.
2729 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
2730
2731 // The anonymous inner class definition of the new expression,
2732 // if one is defined by it.
2733 JCClassDecl cdef = tree.def;
2734
2735 // If enclosing class is given, attribute it, and
2736 // complete class name to be fully qualified
2737 JCExpression clazz = tree.clazz; // Class field following new
2738 JCExpression clazzid; // Identifier in class field
2739 JCAnnotatedType annoclazzid; // Annotated type enclosing clazzid
2740 annoclazzid = null;
2741
2742 if (clazz.hasTag(TYPEAPPLY)) {
2743 clazzid = ((JCTypeApply) clazz).clazz;
2744 if (clazzid.hasTag(ANNOTATED_TYPE)) {
2745 annoclazzid = (JCAnnotatedType) clazzid;
2746 clazzid = annoclazzid.underlyingType;
2747 }
2748 } else {
2749 if (clazz.hasTag(ANNOTATED_TYPE)) {
2750 annoclazzid = (JCAnnotatedType) clazz;
2751 clazzid = annoclazzid.underlyingType;
2752 } else {
2753 clazzid = clazz;
2754 }
2755 }
2756
2757 JCExpression clazzid1 = clazzid; // The same in fully qualified form
2758
2759 if (tree.encl != null) {
2760 // We are seeing a qualified new, of the form
2761 // <expr>.new C <...> (...) ...
2762 // In this case, we let clazz stand for the name of the
2763 // allocated class C prefixed with the type of the qualifier
2764 // expression, so that we can
2765 // resolve it with standard techniques later. I.e., if
2766 // <expr> has type T, then <expr>.new C <...> (...)
2767 // yields a clazz T.C.
2768 Type encltype = chk.checkRefType(tree.encl.pos(),
2769 attribExpr(tree.encl, env));
2770 // TODO 308: in <expr>.new C, do we also want to add the type annotations
2771 // from expr to the combined type, or not? Yes, do this.
2772 clazzid1 = make.at(clazz.pos).Select(make.Type(encltype),
2773 ((JCIdent) clazzid).name);
2774
2775 EndPosTable endPosTable = this.env.toplevel.endPositions;
2776 endPosTable.storeEnd(clazzid1, clazzid.getEndPosition(endPosTable));
2777 if (clazz.hasTag(ANNOTATED_TYPE)) {
2778 JCAnnotatedType annoType = (JCAnnotatedType) clazz;
2779 List<JCAnnotation> annos = annoType.annotations;
2780
2781 if (annoType.underlyingType.hasTag(TYPEAPPLY)) {
2782 clazzid1 = make.at(tree.pos).
2783 TypeApply(clazzid1,
2784 ((JCTypeApply) clazz).arguments);
2785 }
2786
2787 clazzid1 = make.at(tree.pos).
2788 AnnotatedType(annos, clazzid1);
2789 } else if (clazz.hasTag(TYPEAPPLY)) {
2790 clazzid1 = make.at(tree.pos).
2791 TypeApply(clazzid1,
2792 ((JCTypeApply) clazz).arguments);
2793 }
2794
2795 clazz = clazzid1;
2796 }
2797
2798 // Attribute clazz expression and store
2799 // symbol + type back into the attributed tree.
2800 Type clazztype;
2801
2802 try {
2803 env.info.isAnonymousNewClass = tree.def != null;
2804 clazztype = TreeInfo.isEnumInit(env.tree) ?
2805 attribIdentAsEnumType(env, (JCIdent)clazz) :
2806 attribType(clazz, env);
2807 } finally {
2808 env.info.isAnonymousNewClass = false;
2809 }
2810
2811 clazztype = chk.checkDiamond(tree, clazztype);
2812 chk.validate(clazz, localEnv);
2813 if (tree.encl != null) {
2814 // We have to work in this case to store
2815 // symbol + type back into the attributed tree.
2816 tree.clazz.type = clazztype;
2817 TreeInfo.setSymbol(clazzid, TreeInfo.symbol(clazzid1));
2818 clazzid.type = ((JCIdent) clazzid).sym.type;
2819 if (annoclazzid != null) {
2820 annoclazzid.type = clazzid.type;
2821 }
2822 if (!clazztype.isErroneous()) {
2823 if (cdef != null && clazztype.tsym.isInterface()) {
2824 log.error(tree.encl.pos(), Errors.AnonClassImplIntfNoQualForNew);
2825 } else if (clazztype.tsym.isStatic()) {
2826 log.error(tree.encl.pos(), Errors.QualifiedNewOfStaticClass(clazztype.tsym));
2827 }
2828 }
2829 } else {
2830 // Check for the existence of an apropos outer instance
2831 checkNewInnerClass(tree.pos(), env, clazztype, false);
2832 }
2833
2834 // Attribute constructor arguments.
2835 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
2836 final KindSelector pkind =
2837 attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf);
2838 List<Type> argtypes = argtypesBuf.toList();
2839 List<Type> typeargtypes = attribTypes(tree.typeargs, localEnv);
2840
2841 if (clazztype.hasTag(CLASS) || clazztype.hasTag(ERROR)) {
2842 // Enums may not be instantiated except implicitly
2843 if ((clazztype.tsym.flags_field & Flags.ENUM) != 0 &&
2844 (!env.tree.hasTag(VARDEF) ||
2845 (((JCVariableDecl) env.tree).mods.flags & Flags.ENUM) == 0 ||
2846 ((JCVariableDecl) env.tree).init != tree))
2847 log.error(tree.pos(), Errors.EnumCantBeInstantiated);
2848
2849 boolean isSpeculativeDiamondInferenceRound = TreeInfo.isDiamond(tree) &&
2850 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
2851 boolean skipNonDiamondPath = false;
2852 // Check that class is not abstract
2853 if (cdef == null && !isSpeculativeDiamondInferenceRound && // class body may be nulled out in speculative tree copy
2854 (clazztype.tsym.flags() & (ABSTRACT | INTERFACE)) != 0) {
2855 log.error(tree.pos(),
2856 Errors.AbstractCantBeInstantiated(clazztype.tsym));
2857 skipNonDiamondPath = true;
2858 } else if (cdef != null && clazztype.tsym.isInterface()) {
2859 // Check that no constructor arguments are given to
2860 // anonymous classes implementing an interface
2861 if (!argtypes.isEmpty())
2862 log.error(tree.args.head.pos(), Errors.AnonClassImplIntfNoArgs);
2863
2864 if (!typeargtypes.isEmpty())
2865 log.error(tree.typeargs.head.pos(), Errors.AnonClassImplIntfNoTypeargs);
2866
2867 // Error recovery: pretend no arguments were supplied.
2868 argtypes = List.nil();
2869 typeargtypes = List.nil();
2870 skipNonDiamondPath = true;
2871 }
2872 if (TreeInfo.isDiamond(tree)) {
2873 ClassType site = new ClassType(clazztype.getEnclosingType(),
2874 clazztype.tsym.type.getTypeArguments(),
2875 clazztype.tsym,
2876 clazztype.getMetadata());
2877
2878 Env<AttrContext> diamondEnv = localEnv.dup(tree);
2879 diamondEnv.info.selectSuper = cdef != null || tree.classDeclRemoved();
2880 diamondEnv.info.pendingResolutionPhase = null;
2881
2882 //if the type of the instance creation expression is a class type
2883 //apply method resolution inference (JLS 15.12.2.7). The return type
2884 //of the resolved constructor will be a partially instantiated type
2885 Symbol constructor = rs.resolveDiamond(tree.pos(),
2886 diamondEnv,
2887 site,
2888 argtypes,
2889 typeargtypes);
2890 tree.constructor = constructor.baseSymbol();
2891
2892 final TypeSymbol csym = clazztype.tsym;
2893 ResultInfo diamondResult = new ResultInfo(pkind, newMethodTemplate(resultInfo.pt, argtypes, typeargtypes),
2894 diamondContext(tree, csym, resultInfo.checkContext), CheckMode.NO_TREE_UPDATE);
2895 Type constructorType = tree.constructorType = types.createErrorType(clazztype);
2896 constructorType = checkId(tree, site,
2897 constructor,
2898 diamondEnv,
2899 diamondResult);
2900
2901 tree.clazz.type = types.createErrorType(clazztype);
2902 if (!constructorType.isErroneous()) {
2903 tree.clazz.type = clazz.type = constructorType.getReturnType();
2904 tree.constructorType = types.createMethodTypeWithReturn(constructorType, syms.voidType);
2905 }
2906 clazztype = chk.checkClassType(tree.clazz, tree.clazz.type, true);
2907 }
2908
2909 // Resolve the called constructor under the assumption
2910 // that we are referring to a superclass instance of the
2911 // current instance (JLS ???).
2912 else if (!skipNonDiamondPath) {
2913 //the following code alters some of the fields in the current
2914 //AttrContext - hence, the current context must be dup'ed in
2915 //order to avoid downstream failures
2916 Env<AttrContext> rsEnv = localEnv.dup(tree);
2917 rsEnv.info.selectSuper = cdef != null;
2918 rsEnv.info.pendingResolutionPhase = null;
2919 tree.constructor = rs.resolveConstructor(
2920 tree.pos(), rsEnv, clazztype, argtypes, typeargtypes);
2921 if (cdef == null) { //do not check twice!
2922 tree.constructorType = checkId(tree,
2923 clazztype,
2924 tree.constructor,
2925 rsEnv,
2926 new ResultInfo(pkind, newMethodTemplate(syms.voidType, argtypes, typeargtypes), CheckMode.NO_TREE_UPDATE));
2927 if (rsEnv.info.lastResolveVarargs())
2928 Assert.check(tree.constructorType.isErroneous() || tree.varargsElement != null);
2929 }
2930 }
2931
2932 if (cdef != null) {
2933 visitAnonymousClassDefinition(tree, clazz, clazztype, cdef, localEnv, argtypes, typeargtypes, pkind);
2934 return;
2935 }
2936
2937 if (tree.constructor != null && tree.constructor.kind == MTH)
2938 owntype = clazztype;
2939 }
2940 result = check(tree, owntype, KindSelector.VAL, resultInfo);
2941 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
2942 if (tree.constructorType != null && inferenceContext.free(tree.constructorType)) {
2943 //we need to wait for inference to finish and then replace inference vars in the constructor type
2944 inferenceContext.addFreeTypeListener(List.of(tree.constructorType),
2945 instantiatedContext -> {
2946 tree.constructorType = instantiatedContext.asInstType(tree.constructorType);
2947 });
2948 }
2949 chk.validate(tree.typeargs, localEnv);
2950 }
2951
2952 // where
2953 private void visitAnonymousClassDefinition(JCNewClass tree, JCExpression clazz, Type clazztype,
2954 JCClassDecl cdef, Env<AttrContext> localEnv,
2955 List<Type> argtypes, List<Type> typeargtypes,
2956 KindSelector pkind) {
2957 // We are seeing an anonymous class instance creation.
2958 // In this case, the class instance creation
2959 // expression
2960 //
2961 // E.new <typeargs1>C<typargs2>(args) { ... }
2962 //
2963 // is represented internally as
2964 //
2965 // E . new <typeargs1>C<typargs2>(args) ( class <empty-name> { ... } ) .
2966 //
2967 // This expression is then *transformed* as follows:
2968 //
2969 // (1) add an extends or implements clause
2970 // (2) add a constructor.
2971 //
2972 // For instance, if C is a class, and ET is the type of E,
2973 // the expression
2974 //
2975 // E.new <typeargs1>C<typargs2>(args) { ... }
2976 //
2977 // is translated to (where X is a fresh name and typarams is the
2978 // parameter list of the super constructor):
2979 //
2980 // new <typeargs1>X(<*nullchk*>E, args) where
2981 // X extends C<typargs2> {
2982 // <typarams> X(ET e, args) {
2983 // e.<typeargs1>super(args)
2984 // }
2985 // ...
2986 // }
2987 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
2988 Type enclType = clazztype.getEnclosingType();
2989 if (enclType != null &&
2990 enclType.hasTag(CLASS) &&
2991 !chk.checkDenotable((ClassType)enclType)) {
2992 log.error(tree.encl, Errors.EnclosingClassTypeNonDenotable(enclType));
2993 }
2994 final boolean isDiamond = TreeInfo.isDiamond(tree);
2995 if (isDiamond
2996 && ((tree.constructorType != null && inferenceContext.free(tree.constructorType))
2997 || (tree.clazz.type != null && inferenceContext.free(tree.clazz.type)))) {
2998 final ResultInfo resultInfoForClassDefinition = this.resultInfo;
2999 Env<AttrContext> dupLocalEnv = copyEnv(localEnv);
3000 inferenceContext.addFreeTypeListener(List.of(tree.constructorType, tree.clazz.type),
3001 instantiatedContext -> {
3002 tree.constructorType = instantiatedContext.asInstType(tree.constructorType);
3003 tree.clazz.type = clazz.type = instantiatedContext.asInstType(clazz.type);
3004 ResultInfo prevResult = this.resultInfo;
3005 try {
3006 this.resultInfo = resultInfoForClassDefinition;
3007 visitAnonymousClassDefinition(tree, clazz, clazz.type, cdef,
3008 dupLocalEnv, argtypes, typeargtypes, pkind);
3009 } finally {
3010 this.resultInfo = prevResult;
3011 }
3012 });
3013 } else {
3014 if (isDiamond && clazztype.hasTag(CLASS)) {
3015 List<Type> invalidDiamondArgs = chk.checkDiamondDenotable((ClassType)clazztype);
3016 if (!clazztype.isErroneous() && invalidDiamondArgs.nonEmpty()) {
3017 // One or more types inferred in the previous steps is non-denotable.
3018 Fragment fragment = Diamond(clazztype.tsym);
3019 log.error(tree.clazz.pos(),
3020 Errors.CantApplyDiamond1(
3021 fragment,
3022 invalidDiamondArgs.size() > 1 ?
3023 DiamondInvalidArgs(invalidDiamondArgs, fragment) :
3024 DiamondInvalidArg(invalidDiamondArgs, fragment)));
3025 }
3026 // For <>(){}, inferred types must also be accessible.
3027 for (Type t : clazztype.getTypeArguments()) {
3028 rs.checkAccessibleType(env, t);
3029 }
3030 }
3031
3032 // If we already errored, be careful to avoid a further avalanche. ErrorType answers
3033 // false for isInterface call even when the original type is an interface.
3034 boolean implementing = clazztype.tsym.isInterface() ||
3035 clazztype.isErroneous() && !clazztype.getOriginalType().hasTag(NONE) &&
3036 clazztype.getOriginalType().tsym.isInterface();
3037
3038 if (implementing) {
3039 cdef.implementing = List.of(clazz);
3040 } else {
3041 cdef.extending = clazz;
3042 }
3043
3044 if (resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3045 rs.isSerializable(clazztype)) {
3046 localEnv.info.isSerializable = true;
3047 }
3048
3049 attribStat(cdef, localEnv);
3050
3051 List<Type> finalargtypes;
3052 // If an outer instance is given,
3053 // prefix it to the constructor arguments
3054 // and delete it from the new expression
3055 if (tree.encl != null && !clazztype.tsym.isInterface()) {
3056 finalargtypes = argtypes.prepend(tree.encl.type);
3057 } else {
3058 finalargtypes = argtypes;
3059 }
3060
3061 // Reassign clazztype and recompute constructor. As this necessarily involves
3062 // another attribution pass for deferred types in the case of <>, replicate
3063 // them. Original arguments have right decorations already.
3064 if (isDiamond && pkind.contains(KindSelector.POLY)) {
3065 finalargtypes = finalargtypes.map(deferredAttr.deferredCopier);
3066 }
3067
3068 clazztype = clazztype.hasTag(ERROR) ? types.createErrorType(cdef.sym.type)
3069 : cdef.sym.type;
3070 Symbol sym = tree.constructor = rs.resolveConstructor(
3071 tree.pos(), localEnv, clazztype, finalargtypes, typeargtypes);
3072 Assert.check(!sym.kind.isResolutionError());
3073 tree.constructor = sym;
3074 tree.constructorType = checkId(tree,
3075 clazztype,
3076 tree.constructor,
3077 localEnv,
3078 new ResultInfo(pkind, newMethodTemplate(syms.voidType, finalargtypes, typeargtypes), CheckMode.NO_TREE_UPDATE));
3079 }
3080 Type owntype = (tree.constructor != null && tree.constructor.kind == MTH) ?
3081 clazztype : types.createErrorType(tree.type);
3082 result = check(tree, owntype, KindSelector.VAL, resultInfo.dup(CheckMode.NO_INFERENCE_HOOK));
3083 chk.validate(tree.typeargs, localEnv);
3084 }
3085
3086 CheckContext diamondContext(JCNewClass clazz, TypeSymbol tsym, CheckContext checkContext) {
3087 return new Check.NestedCheckContext(checkContext) {
3088 @Override
3089 public void report(DiagnosticPosition _unused, JCDiagnostic details) {
3090 enclosingContext.report(clazz.clazz,
3091 diags.fragment(Fragments.CantApplyDiamond1(Fragments.Diamond(tsym), details)));
3092 }
3093 };
3094 }
3095
3096 void checkNewInnerClass(DiagnosticPosition pos, Env<AttrContext> env, Type type, boolean isSuper) {
3097 boolean isLocal = type.tsym.owner.kind == VAR || type.tsym.owner.kind == MTH;
3098 if ((type.tsym.flags() & (INTERFACE | ENUM | RECORD)) != 0 ||
3099 (!isLocal && !type.tsym.isInner()) ||
3100 (isSuper && env.enclClass.sym.isAnonymous())) {
3101 // nothing to check
3102 return;
3103 }
3104 Symbol res = isLocal ?
3105 rs.findLocalClassOwner(env, type.tsym) :
3106 rs.findSelfContaining(pos, env, type.getEnclosingType().tsym, isSuper);
3107 if (res.exists()) {
3108 rs.accessBase(res, pos, env.enclClass.sym.type, names._this, true);
3109 } else {
3110 log.error(pos, Errors.EnclClassRequired(type.tsym));
3111 }
3112 }
3113
3114 /** Make an attributed null check tree.
3115 */
3116 public JCExpression makeNullCheck(JCExpression arg) {
3117 // optimization: new Outer() can never be null; skip null check
3118 if (arg.getTag() == NEWCLASS)
3119 return arg;
3120 // optimization: X.this is never null; skip null check
3121 Name name = TreeInfo.name(arg);
3122 if (name == names._this || name == names._super) return arg;
3123
3124 JCTree.Tag optag = NULLCHK;
3125 JCUnary tree = make.at(arg.pos).Unary(optag, arg);
3126 tree.operator = operators.resolveUnary(arg, optag, arg.type);
3127 tree.type = arg.type;
3128 return tree;
3129 }
3130
3131 public void visitNewArray(JCNewArray tree) {
3132 Type owntype = types.createErrorType(tree.type);
3133 Env<AttrContext> localEnv = env.dup(tree);
3134 Type elemtype;
3135 if (tree.elemtype != null) {
3136 elemtype = attribType(tree.elemtype, localEnv);
3137 chk.validate(tree.elemtype, localEnv);
3138 owntype = elemtype;
3139 for (List<JCExpression> l = tree.dims; l.nonEmpty(); l = l.tail) {
3140 attribExpr(l.head, localEnv, syms.intType);
3141 owntype = new ArrayType(owntype, syms.arrayClass);
3142 }
3143 } else {
3144 // we are seeing an untyped aggregate { ... }
3145 // this is allowed only if the prototype is an array
3146 if (pt().hasTag(ARRAY)) {
3147 elemtype = types.elemtype(pt());
3148 } else {
3149 if (!pt().hasTag(ERROR) &&
3150 (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3151 log.error(tree.pos(),
3152 Errors.IllegalInitializerForType(pt()));
3153 }
3154 elemtype = types.createErrorType(pt());
3155 }
3156 }
3157 if (tree.elems != null) {
3158 attribExprs(tree.elems, localEnv, elemtype);
3159 owntype = new ArrayType(elemtype, syms.arrayClass);
3160 }
3161 if (!types.isReifiable(elemtype))
3162 log.error(tree.pos(), Errors.GenericArrayCreation);
3163 result = check(tree, owntype, KindSelector.VAL, resultInfo);
3164 }
3165
3166 /*
3167 * A lambda expression can only be attributed when a target-type is available.
3168 * In addition, if the target-type is that of a functional interface whose
3169 * descriptor contains inference variables in argument position the lambda expression
3170 * is 'stuck' (see DeferredAttr).
3171 */
3172 @Override
3173 public void visitLambda(final JCLambda that) {
3174 boolean wrongContext = false;
3175 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
3176 if (pt().hasTag(NONE) && (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3177 //lambda only allowed in assignment or method invocation/cast context
3178 log.error(that.pos(), Errors.UnexpectedLambda);
3179 }
3180 resultInfo = recoveryInfo;
3181 wrongContext = true;
3182 }
3183 if (types.isQuoted(pt())) {
3184 attribQuotedLambda(that);
3185 } else {
3186 attribFunctionalLambda(that, wrongContext);
3187 }
3188 }
3189
3190 void attribFunctionalLambda(JCLambda that, boolean wrongContext) {
3191 //create an environment for attribution of the lambda expression
3192 final Env<AttrContext> localEnv = lambdaEnv(that, env);
3193 boolean needsRecovery =
3194 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK;
3195 try {
3196 if (needsRecovery && rs.isSerializable(pt())) {
3197 localEnv.info.isSerializable = true;
3198 localEnv.info.isSerializableLambda = true;
3199 }
3200 List<Type> explicitParamTypes = null;
3201 if (that.paramKind == JCLambda.ParameterKind.EXPLICIT) {
3202 //attribute lambda parameters
3203 attribStats(that.params, localEnv);
3204 explicitParamTypes = TreeInfo.types(that.params);
3205 }
3206
3207 TargetInfo targetInfo = getTargetInfo(that, resultInfo, explicitParamTypes);
3208 Type currentTarget = targetInfo.target;
3209 Type lambdaType = targetInfo.descriptor;
3210
3211 if (currentTarget.isErroneous()) {
3212 result = that.type = currentTarget;
3213 return;
3214 }
3215
3216 setFunctionalInfo(localEnv, that, pt(), lambdaType, currentTarget, resultInfo.checkContext);
3217
3218 if (lambdaType.hasTag(FORALL)) {
3219 //lambda expression target desc cannot be a generic method
3220 Fragment msg = Fragments.InvalidGenericLambdaTarget(lambdaType,
3221 kindName(currentTarget.tsym),
3222 currentTarget.tsym);
3223 resultInfo.checkContext.report(that, diags.fragment(msg));
3224 result = that.type = types.createErrorType(pt());
3225 return;
3226 }
3227
3228 if (that.paramKind == JCLambda.ParameterKind.IMPLICIT) {
3229 //add param type info in the AST
3230 List<Type> actuals = lambdaType.getParameterTypes();
3231 List<JCVariableDecl> params = that.params;
3232
3233 boolean arityMismatch = false;
3234
3235 while (params.nonEmpty()) {
3236 if (actuals.isEmpty()) {
3237 //not enough actuals to perform lambda parameter inference
3238 arityMismatch = true;
3239 }
3240 //reset previously set info
3241 Type argType = arityMismatch ?
3242 syms.errType :
3243 actuals.head;
3244 if (params.head.isImplicitlyTyped()) {
3245 setSyntheticVariableType(params.head, argType);
3246 }
3247 params.head.sym = null;
3248 actuals = actuals.isEmpty() ?
3249 actuals :
3250 actuals.tail;
3251 params = params.tail;
3252 }
3253
3254 //attribute lambda parameters
3255 attribStats(that.params, localEnv);
3256
3257 if (arityMismatch) {
3258 resultInfo.checkContext.report(that, diags.fragment(Fragments.IncompatibleArgTypesInLambda));
3259 result = that.type = types.createErrorType(currentTarget);
3260 return;
3261 }
3262 }
3263
3264 //from this point on, no recovery is needed; if we are in assignment context
3265 //we will be able to attribute the whole lambda body, regardless of errors;
3266 //if we are in a 'check' method context, and the lambda is not compatible
3267 //with the target-type, it will be recovered anyway in Attr.checkId
3268 needsRecovery = false;
3269
3270 ResultInfo bodyResultInfo = localEnv.info.returnResult =
3271 lambdaBodyResult(that, lambdaType, resultInfo);
3272
3273 if (that.getBodyKind() == JCLambda.BodyKind.EXPRESSION) {
3274 attribTree(that.getBody(), localEnv, bodyResultInfo);
3275 } else {
3276 JCBlock body = (JCBlock)that.body;
3277 if (body == breakTree &&
3278 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
3279 breakTreeFound(copyEnv(localEnv));
3280 }
3281 attribStats(body.stats, localEnv);
3282 }
3283
3284 result = check(that, currentTarget, KindSelector.VAL, resultInfo);
3285
3286 boolean isSpeculativeRound =
3287 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
3288
3289 preFlow(that);
3290 flow.analyzeLambda(env, that, make, isSpeculativeRound);
3291
3292 that.type = currentTarget; //avoids recovery at this stage
3293 checkLambdaCompatible(that, lambdaType, resultInfo.checkContext);
3294
3295 if (!isSpeculativeRound) {
3296 //add thrown types as bounds to the thrown types free variables if needed:
3297 if (resultInfo.checkContext.inferenceContext().free(lambdaType.getThrownTypes())) {
3298 List<Type> inferredThrownTypes = flow.analyzeLambdaThrownTypes(env, that, make);
3299 if(!checkExConstraints(inferredThrownTypes, lambdaType.getThrownTypes(), resultInfo.checkContext.inferenceContext())) {
3300 log.error(that, Errors.IncompatibleThrownTypesInMref(lambdaType.getThrownTypes()));
3301 }
3302 }
3303
3304 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), lambdaType, currentTarget);
3305 }
3306 result = wrongContext ? that.type = types.createErrorType(pt())
3307 : check(that, currentTarget, KindSelector.VAL, resultInfo);
3308 } catch (Types.FunctionDescriptorLookupError ex) {
3309 JCDiagnostic cause = ex.getDiagnostic();
3310 resultInfo.checkContext.report(that, cause);
3311 result = that.type = types.createErrorType(pt());
3312 return;
3313 } catch (CompletionFailure cf) {
3314 chk.completionError(that.pos(), cf);
3315 } catch (Throwable t) {
3316 //when an unexpected exception happens, avoid attempts to attribute the same tree again
3317 //as that would likely cause the same exception again.
3318 needsRecovery = false;
3319 throw t;
3320 } finally {
3321 localEnv.info.scope.leave();
3322 if (needsRecovery) {
3323 Type prevResult = result;
3324 try {
3325 attribTree(that, env, recoveryInfo);
3326 } finally {
3327 if (result == Type.recoveryType) {
3328 result = prevResult;
3329 }
3330 }
3331 }
3332 }
3333 }
3334
3335 void attribQuotedLambda(JCLambda that) {
3336 // create an environment for attribution of the lambda expression
3337 final Env<AttrContext> localEnv = lambdaEnv(that, env);
3338 try {
3339 // if quoted lambda is implicit, issue error, and recover
3340 if (that.paramKind == ParameterKind.IMPLICIT) {
3341 log.error(that, Errors.QuotedLambdaMustBeExplicit);
3342 // recovery
3343 List<JCVariableDecl> params = that.params;
3344 while (params.nonEmpty()) {
3345 Type argType = syms.errType;
3346 if (params.head.isImplicitlyTyped()) {
3347 setSyntheticVariableType(params.head, argType);
3348 }
3349 params = params.tail;
3350 }
3351 }
3352 // attribute lambda parameters
3353 attribStats(that.params, localEnv);
3354 List<Type> explicitParamTypes = TreeInfo.types(that.params);
3355
3356 ListBuffer<Type> restypes = new ListBuffer<>();
3357 ListBuffer<DiagnosticPosition> resPositions = new ListBuffer<>();
3358 ResultInfo bodyResultInfo = localEnv.info.returnResult = unknownExprInfo;
3359
3360 // type-check lambda body, and capture return types
3361 if (that.getBodyKind() == JCLambda.BodyKind.EXPRESSION) {
3362 attribTree(that.getBody(), localEnv, bodyResultInfo);
3363 restypes.add(that.getBody().type);
3364 } else {
3365 JCBlock body = (JCBlock)that.body;
3366 if (body == breakTree &&
3367 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
3368 breakTreeFound(copyEnv(localEnv));
3369 }
3370 attribStats(body.stats, localEnv);
3371 new LambdaReturnScanner() {
3372 @Override
3373 public void visitReturn(JCReturn tree) {
3374 if (tree.expr != null) {
3375 resPositions.add(tree);
3376 }
3377 restypes.add(tree.expr == null ? syms.voidType : tree.expr.type);
3378 }
3379 }.scan(body);
3380 }
3381
3382 // check if lambda body can complete normally
3383 preFlow(that);
3384 flow.analyzeLambda(localEnv, that, make, false);
3385
3386 final Type restype;
3387 if (that.getBodyKind() == BodyKind.STATEMENT) {
3388 if (that.canCompleteNormally) {
3389 // a lambda that completes normally has an implicit void return
3390 restypes.add(syms.voidType);
3391 }
3392
3393 boolean hasNonVoidReturn = restypes.toList()
3394 .stream().anyMatch(t -> t != syms.voidType);
3395 boolean hasVoidReturn = restypes.toList()
3396 .stream().anyMatch(t -> t == syms.voidType);
3397
3398 if (hasVoidReturn && hasNonVoidReturn) {
3399 // void vs. non-void mismatch
3400 log.error(that.body, Errors.CantInferQuotedLambdaReturnType(restypes.toList()));
3401 restype = syms.errorType;
3402 } else if (hasVoidReturn) {
3403 restype = syms.voidType;
3404 } else {
3405 restype = condType(resPositions.toList(), restypes.toList());
3406 }
3407 } else {
3408 restype = restypes.first();
3409 }
3410
3411 // infer lambda return type using lub
3412 if (restype.hasTag(ERROR)) {
3413 // some other error occurred
3414 log.error(that.body, Errors.CantInferQuotedLambdaReturnType(restypes.toList()));
3415 }
3416
3417 // infer thrown types
3418 List<Type> thrownTypes = flow.analyzeLambdaThrownTypes(localEnv, that, make);
3419
3420 // set up target descriptor with explicit parameter types, and inferred thrown/return types
3421 that.target = new MethodType(explicitParamTypes, restype, thrownTypes, syms.methodClass);
3422 result = that.type = pt();
3423 } finally {
3424 localEnv.info.scope.leave();
3425 }
3426 }
3427 //where
3428 class TargetInfo {
3429 Type target;
3430 Type descriptor;
3431
3432 public TargetInfo(Type target, Type descriptor) {
3433 this.target = target;
3434 this.descriptor = descriptor;
3435 }
3436 }
3437
3438 TargetInfo getTargetInfo(JCPolyExpression that, ResultInfo resultInfo, List<Type> explicitParamTypes) {
3439 Type lambdaType;
3440 Type currentTarget = resultInfo.pt;
3441 if (resultInfo.pt != Type.recoveryType) {
3442 /* We need to adjust the target. If the target is an
3443 * intersection type, for example: SAM & I1 & I2 ...
3444 * the target will be updated to SAM
3445 */
3446 currentTarget = targetChecker.visit(currentTarget, that);
3447 if (!currentTarget.isIntersection()) {
3448 if (explicitParamTypes != null) {
3449 currentTarget = infer.instantiateFunctionalInterface(that,
3450 currentTarget, explicitParamTypes, resultInfo.checkContext);
3451 }
3452 currentTarget = types.removeWildcards(currentTarget);
3453 lambdaType = types.findDescriptorType(currentTarget);
3454 } else {
3455 IntersectionClassType ict = (IntersectionClassType)currentTarget;
3456 ListBuffer<Type> components = new ListBuffer<>();
3457 for (Type bound : ict.getExplicitComponents()) {
3458 if (explicitParamTypes != null) {
3459 try {
3460 bound = infer.instantiateFunctionalInterface(that,
3461 bound, explicitParamTypes, resultInfo.checkContext);
3462 } catch (FunctionDescriptorLookupError t) {
3463 // do nothing
3464 }
3465 }
3466 bound = types.removeWildcards(bound);
3467 components.add(bound);
3468 }
3469 currentTarget = types.makeIntersectionType(components.toList());
3470 currentTarget.tsym.flags_field |= INTERFACE;
3471 lambdaType = types.findDescriptorType(currentTarget);
3472 }
3473
3474 } else {
3475 currentTarget = Type.recoveryType;
3476 lambdaType = fallbackDescriptorType(that);
3477 }
3478 if (that.hasTag(LAMBDA) && lambdaType.hasTag(FORALL)) {
3479 //lambda expression target desc cannot be a generic method
3480 Fragment msg = Fragments.InvalidGenericLambdaTarget(lambdaType,
3481 kindName(currentTarget.tsym),
3482 currentTarget.tsym);
3483 resultInfo.checkContext.report(that, diags.fragment(msg));
3484 currentTarget = types.createErrorType(pt());
3485 }
3486 return new TargetInfo(currentTarget, lambdaType);
3487 }
3488
3489 void preFlow(JCLambda tree) {
3490 attrRecover.doRecovery();
3491 new PostAttrAnalyzer() {
3492 @Override
3493 public void scan(JCTree tree) {
3494 if (tree == null ||
3495 (tree.type != null &&
3496 tree.type == Type.stuckType)) {
3497 //don't touch stuck expressions!
3498 return;
3499 }
3500 super.scan(tree);
3501 }
3502
3503 @Override
3504 public void visitClassDef(JCClassDecl that) {
3505 // or class declaration trees!
3506 }
3507
3508 public void visitLambda(JCLambda that) {
3509 // or lambda expressions!
3510 }
3511 }.scan(tree.body);
3512 }
3513
3514 Types.MapVisitor<DiagnosticPosition> targetChecker = new Types.MapVisitor<DiagnosticPosition>() {
3515
3516 @Override
3517 public Type visitClassType(ClassType t, DiagnosticPosition pos) {
3518 return t.isIntersection() ?
3519 visitIntersectionClassType((IntersectionClassType)t, pos) : t;
3520 }
3521
3522 public Type visitIntersectionClassType(IntersectionClassType ict, DiagnosticPosition pos) {
3523 types.findDescriptorSymbol(makeNotionalInterface(ict, pos));
3524 return ict;
3525 }
3526
3527 private TypeSymbol makeNotionalInterface(IntersectionClassType ict, DiagnosticPosition pos) {
3528 ListBuffer<Type> targs = new ListBuffer<>();
3529 ListBuffer<Type> supertypes = new ListBuffer<>();
3530 for (Type i : ict.interfaces_field) {
3531 if (i.isParameterized()) {
3532 targs.appendList(i.tsym.type.allparams());
3533 }
3534 supertypes.append(i.tsym.type);
3535 }
3536 IntersectionClassType notionalIntf = types.makeIntersectionType(supertypes.toList());
3537 notionalIntf.allparams_field = targs.toList();
3538 notionalIntf.tsym.flags_field |= INTERFACE;
3539 return notionalIntf.tsym;
3540 }
3541 };
3542
3543 private Type fallbackDescriptorType(JCExpression tree) {
3544 switch (tree.getTag()) {
3545 case LAMBDA:
3546 JCLambda lambda = (JCLambda)tree;
3547 List<Type> argtypes = List.nil();
3548 for (JCVariableDecl param : lambda.params) {
3549 argtypes = param.vartype != null && param.vartype.type != null ?
3550 argtypes.append(param.vartype.type) :
3551 argtypes.append(syms.errType);
3552 }
3553 return new MethodType(argtypes, Type.recoveryType,
3554 List.of(syms.throwableType), syms.methodClass);
3555 case REFERENCE:
3556 return new MethodType(List.nil(), Type.recoveryType,
3557 List.of(syms.throwableType), syms.methodClass);
3558 default:
3559 Assert.error("Cannot get here!");
3560 }
3561 return null;
3562 }
3563
3564 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
3565 final InferenceContext inferenceContext, final Type... ts) {
3566 checkAccessibleTypes(pos, env, inferenceContext, List.from(ts));
3567 }
3568
3569 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
3570 final InferenceContext inferenceContext, final List<Type> ts) {
3571 if (inferenceContext.free(ts)) {
3572 inferenceContext.addFreeTypeListener(ts,
3573 solvedContext -> checkAccessibleTypes(pos, env, solvedContext, solvedContext.asInstTypes(ts)));
3574 } else {
3575 for (Type t : ts) {
3576 rs.checkAccessibleType(env, t);
3577 }
3578 }
3579 }
3580
3581 /**
3582 * Lambda/method reference have a special check context that ensures
3583 * that i.e. a lambda return type is compatible with the expected
3584 * type according to both the inherited context and the assignment
3585 * context.
3586 */
3587 class FunctionalReturnContext extends Check.NestedCheckContext {
3588
3589 FunctionalReturnContext(CheckContext enclosingContext) {
3590 super(enclosingContext);
3591 }
3592
3593 @Override
3594 public boolean compatible(Type found, Type req, Warner warn) {
3595 //return type must be compatible in both current context and assignment context
3596 return chk.basicHandler.compatible(inferenceContext().asUndetVar(found), inferenceContext().asUndetVar(req), warn);
3597 }
3598
3599 @Override
3600 public void report(DiagnosticPosition pos, JCDiagnostic details) {
3601 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleRetTypeInLambda(details)));
3602 }
3603 }
3604
3605 class ExpressionLambdaReturnContext extends FunctionalReturnContext {
3606
3607 JCExpression expr;
3608 boolean expStmtExpected;
3609
3610 ExpressionLambdaReturnContext(JCExpression expr, CheckContext enclosingContext) {
3611 super(enclosingContext);
3612 this.expr = expr;
3613 }
3614
3615 @Override
3616 public void report(DiagnosticPosition pos, JCDiagnostic details) {
3617 if (expStmtExpected) {
3618 enclosingContext.report(pos, diags.fragment(Fragments.StatExprExpected));
3619 } else {
3620 super.report(pos, details);
3621 }
3622 }
3623
3624 @Override
3625 public boolean compatible(Type found, Type req, Warner warn) {
3626 //a void return is compatible with an expression statement lambda
3627 if (req.hasTag(VOID)) {
3628 expStmtExpected = true;
3629 return TreeInfo.isExpressionStatement(expr);
3630 } else {
3631 return super.compatible(found, req, warn);
3632 }
3633 }
3634 }
3635
3636 ResultInfo lambdaBodyResult(JCLambda that, Type descriptor, ResultInfo resultInfo) {
3637 FunctionalReturnContext funcContext = that.getBodyKind() == JCLambda.BodyKind.EXPRESSION ?
3638 new ExpressionLambdaReturnContext((JCExpression)that.getBody(), resultInfo.checkContext) :
3639 new FunctionalReturnContext(resultInfo.checkContext);
3640
3641 return descriptor.getReturnType() == Type.recoveryType ?
3642 recoveryInfo :
3643 new ResultInfo(KindSelector.VAL,
3644 descriptor.getReturnType(), funcContext);
3645 }
3646
3647 /**
3648 * Lambda compatibility. Check that given return types, thrown types, parameter types
3649 * are compatible with the expected functional interface descriptor. This means that:
3650 * (i) parameter types must be identical to those of the target descriptor; (ii) return
3651 * types must be compatible with the return type of the expected descriptor.
3652 */
3653 void checkLambdaCompatible(JCLambda tree, Type descriptor, CheckContext checkContext) {
3654 Type returnType = checkContext.inferenceContext().asUndetVar(descriptor.getReturnType());
3655
3656 //return values have already been checked - but if lambda has no return
3657 //values, we must ensure that void/value compatibility is correct;
3658 //this amounts at checking that, if a lambda body can complete normally,
3659 //the descriptor's return type must be void
3660 if (tree.getBodyKind() == JCLambda.BodyKind.STATEMENT && tree.canCompleteNormally &&
3661 !returnType.hasTag(VOID) && returnType != Type.recoveryType) {
3662 Fragment msg =
3663 Fragments.IncompatibleRetTypeInLambda(Fragments.MissingRetVal(returnType));
3664 checkContext.report(tree,
3665 diags.fragment(msg));
3666 }
3667
3668 List<Type> argTypes = checkContext.inferenceContext().asUndetVars(descriptor.getParameterTypes());
3669 if (!types.isSameTypes(argTypes, TreeInfo.types(tree.params))) {
3670 checkContext.report(tree, diags.fragment(Fragments.IncompatibleArgTypesInLambda));
3671 }
3672 }
3673
3674 /* This method returns an environment to be used to attribute a lambda
3675 * expression.
3676 *
3677 * The owner of this environment is a method symbol. If the current owner
3678 * is not a method (e.g. if the lambda occurs in a field initializer), then
3679 * a synthetic method symbol owner is created.
3680 */
3681 public Env<AttrContext> lambdaEnv(JCLambda that, Env<AttrContext> env) {
3682 Env<AttrContext> lambdaEnv;
3683 Symbol owner = env.info.scope.owner;
3684 if (owner.kind == VAR && owner.owner.kind == TYP) {
3685 // If the lambda is nested in a field initializer, we need to create a fake init method.
3686 // Uniqueness of this symbol is not important (as e.g. annotations will be added on the
3687 // init symbol's owner).
3688 ClassSymbol enclClass = owner.enclClass();
3689 Name initName = owner.isStatic() ? names.clinit : names.init;
3690 MethodSymbol initSym = new MethodSymbol(BLOCK | (owner.isStatic() ? STATIC : 0) | SYNTHETIC | PRIVATE,
3691 initName, initBlockType, enclClass);
3692 initSym.params = List.nil();
3693 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dupUnshared(initSym)));
3694 } else {
3695 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dup()));
3696 }
3697 lambdaEnv.info.yieldResult = null;
3698 lambdaEnv.info.isLambda = true;
3699 return lambdaEnv;
3700 }
3701
3702 @Override
3703 public void visitReference(final JCMemberReference that) {
3704 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
3705 if (pt().hasTag(NONE) && (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
3706 //method reference only allowed in assignment or method invocation/cast context
3707 log.error(that.pos(), Errors.UnexpectedMref);
3708 }
3709 result = that.type = types.createErrorType(pt());
3710 return;
3711 }
3712 final Env<AttrContext> localEnv = env.dup(that);
3713 try {
3714 //attribute member reference qualifier - if this is a constructor
3715 //reference, the expected kind must be a type
3716 Type exprType = attribTree(that.expr, env, memberReferenceQualifierResult(that));
3717
3718 if (that.getMode() == JCMemberReference.ReferenceMode.NEW) {
3719 exprType = chk.checkConstructorRefType(that.expr, exprType);
3720 if (!exprType.isErroneous() &&
3721 exprType.isRaw() &&
3722 that.typeargs != null) {
3723 log.error(that.expr.pos(),
3724 Errors.InvalidMref(Kinds.kindName(that.getMode()),
3725 Fragments.MrefInferAndExplicitParams));
3726 exprType = types.createErrorType(exprType);
3727 }
3728 }
3729
3730 if (exprType.isErroneous()) {
3731 //if the qualifier expression contains problems,
3732 //give up attribution of method reference
3733 result = that.type = exprType;
3734 return;
3735 }
3736
3737 if (TreeInfo.isStaticSelector(that.expr, names)) {
3738 //if the qualifier is a type, validate it; raw warning check is
3739 //omitted as we don't know at this stage as to whether this is a
3740 //raw selector (because of inference)
3741 chk.validate(that.expr, env, false);
3742 } else {
3743 Symbol lhsSym = TreeInfo.symbol(that.expr);
3744 localEnv.info.selectSuper = lhsSym != null && lhsSym.name == names._super;
3745 }
3746 //attrib type-arguments
3747 List<Type> typeargtypes = List.nil();
3748 if (that.typeargs != null) {
3749 typeargtypes = attribTypes(that.typeargs, localEnv);
3750 }
3751
3752 boolean isTargetSerializable =
3753 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3754 rs.isSerializable(pt());
3755 TargetInfo targetInfo = getTargetInfo(that, resultInfo, null);
3756 Type currentTarget = targetInfo.target;
3757 Type desc = targetInfo.descriptor;
3758
3759 setFunctionalInfo(localEnv, that, pt(), desc, currentTarget, resultInfo.checkContext);
3760 List<Type> argtypes = desc.getParameterTypes();
3761 Resolve.MethodCheck referenceCheck = rs.resolveMethodCheck;
3762
3763 if (resultInfo.checkContext.inferenceContext().free(argtypes)) {
3764 referenceCheck = rs.new MethodReferenceCheck(resultInfo.checkContext.inferenceContext());
3765 }
3766
3767 Pair<Symbol, Resolve.ReferenceLookupHelper> refResult = null;
3768 List<Type> saved_undet = resultInfo.checkContext.inferenceContext().save();
3769 try {
3770 refResult = rs.resolveMemberReference(localEnv, that, that.expr.type,
3771 that.name, argtypes, typeargtypes, targetInfo.descriptor, referenceCheck,
3772 resultInfo.checkContext.inferenceContext(), rs.basicReferenceChooser);
3773 } finally {
3774 resultInfo.checkContext.inferenceContext().rollback(saved_undet);
3775 }
3776
3777 Symbol refSym = refResult.fst;
3778 Resolve.ReferenceLookupHelper lookupHelper = refResult.snd;
3779
3780 /** this switch will need to go away and be replaced by the new RESOLUTION_TARGET testing
3781 * JDK-8075541
3782 */
3783 if (refSym.kind != MTH) {
3784 boolean targetError;
3785 switch (refSym.kind) {
3786 case ABSENT_MTH:
3787 targetError = false;
3788 break;
3789 case WRONG_MTH:
3790 case WRONG_MTHS:
3791 case AMBIGUOUS:
3792 case HIDDEN:
3793 case STATICERR:
3794 targetError = true;
3795 break;
3796 default:
3797 Assert.error("unexpected result kind " + refSym.kind);
3798 targetError = false;
3799 }
3800
3801 JCDiagnostic detailsDiag = ((Resolve.ResolveError)refSym.baseSymbol())
3802 .getDiagnostic(JCDiagnostic.DiagnosticType.FRAGMENT,
3803 that, exprType.tsym, exprType, that.name, argtypes, typeargtypes);
3804
3805 JCDiagnostic diag = diags.create(log.currentSource(), that,
3806 targetError ?
3807 Fragments.InvalidMref(Kinds.kindName(that.getMode()), detailsDiag) :
3808 Errors.InvalidMref(Kinds.kindName(that.getMode()), detailsDiag));
3809
3810 if (targetError && currentTarget == Type.recoveryType) {
3811 //a target error doesn't make sense during recovery stage
3812 //as we don't know what actual parameter types are
3813 result = that.type = currentTarget;
3814 return;
3815 } else {
3816 if (targetError) {
3817 resultInfo.checkContext.report(that, diag);
3818 } else {
3819 log.report(diag);
3820 }
3821 result = that.type = types.createErrorType(currentTarget);
3822 return;
3823 }
3824 }
3825
3826 that.sym = refSym.isConstructor() ? refSym.baseSymbol() : refSym;
3827 that.kind = lookupHelper.referenceKind(that.sym);
3828 that.ownerAccessible = rs.isAccessible(localEnv, that.sym.enclClass());
3829
3830 if (desc.getReturnType() == Type.recoveryType) {
3831 // stop here
3832 result = that.type = currentTarget;
3833 return;
3834 }
3835
3836 if (!env.info.attributionMode.isSpeculative && that.getMode() == JCMemberReference.ReferenceMode.NEW) {
3837 checkNewInnerClass(that.pos(), env, exprType, false);
3838 }
3839
3840 if (resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
3841
3842 if (that.getMode() == ReferenceMode.INVOKE &&
3843 TreeInfo.isStaticSelector(that.expr, names) &&
3844 that.kind.isUnbound() &&
3845 lookupHelper.site.isRaw()) {
3846 chk.checkRaw(that.expr, localEnv);
3847 }
3848
3849 if (that.sym.isStatic() && TreeInfo.isStaticSelector(that.expr, names) &&
3850 exprType.getTypeArguments().nonEmpty()) {
3851 //static ref with class type-args
3852 log.error(that.expr.pos(),
3853 Errors.InvalidMref(Kinds.kindName(that.getMode()),
3854 Fragments.StaticMrefWithTargs));
3855 result = that.type = types.createErrorType(currentTarget);
3856 return;
3857 }
3858
3859 if (!refSym.isStatic() && that.kind == JCMemberReference.ReferenceKind.SUPER) {
3860 // Check that super-qualified symbols are not abstract (JLS)
3861 rs.checkNonAbstract(that.pos(), that.sym);
3862 }
3863
3864 if (isTargetSerializable) {
3865 chk.checkAccessFromSerializableElement(that, true);
3866 }
3867 }
3868
3869 ResultInfo checkInfo =
3870 resultInfo.dup(newMethodTemplate(
3871 desc.getReturnType().hasTag(VOID) ? Type.noType : desc.getReturnType(),
3872 that.kind.isUnbound() ? argtypes.tail : argtypes, typeargtypes),
3873 new FunctionalReturnContext(resultInfo.checkContext), CheckMode.NO_TREE_UPDATE);
3874
3875 Type refType = checkId(that, lookupHelper.site, refSym, localEnv, checkInfo);
3876
3877 if (that.kind.isUnbound() &&
3878 resultInfo.checkContext.inferenceContext().free(argtypes.head)) {
3879 //re-generate inference constraints for unbound receiver
3880 if (!types.isSubtype(resultInfo.checkContext.inferenceContext().asUndetVar(argtypes.head), exprType)) {
3881 //cannot happen as this has already been checked - we just need
3882 //to regenerate the inference constraints, as that has been lost
3883 //as a result of the call to inferenceContext.save()
3884 Assert.error("Can't get here");
3885 }
3886 }
3887
3888 if (!refType.isErroneous()) {
3889 refType = types.createMethodTypeWithReturn(refType,
3890 adjustMethodReturnType(refSym, lookupHelper.site, that.name, checkInfo.pt.getParameterTypes(), refType.getReturnType()));
3891 }
3892
3893 //go ahead with standard method reference compatibility check - note that param check
3894 //is a no-op (as this has been taken care during method applicability)
3895 boolean isSpeculativeRound =
3896 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
3897
3898 that.type = currentTarget; //avoids recovery at this stage
3899 checkReferenceCompatible(that, desc, refType, resultInfo.checkContext, isSpeculativeRound);
3900 if (!isSpeculativeRound) {
3901 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), desc, currentTarget);
3902 }
3903 result = check(that, currentTarget, KindSelector.VAL, resultInfo);
3904 } catch (Types.FunctionDescriptorLookupError ex) {
3905 JCDiagnostic cause = ex.getDiagnostic();
3906 resultInfo.checkContext.report(that, cause);
3907 result = that.type = types.createErrorType(pt());
3908 return;
3909 }
3910 }
3911 //where
3912 ResultInfo memberReferenceQualifierResult(JCMemberReference tree) {
3913 //if this is a constructor reference, the expected kind must be a type
3914 return new ResultInfo(tree.getMode() == ReferenceMode.INVOKE ?
3915 KindSelector.VAL_TYP : KindSelector.TYP,
3916 Type.noType);
3917 }
3918
3919
3920 @SuppressWarnings("fallthrough")
3921 void checkReferenceCompatible(JCMemberReference tree, Type descriptor, Type refType, CheckContext checkContext, boolean speculativeAttr) {
3922 InferenceContext inferenceContext = checkContext.inferenceContext();
3923 Type returnType = inferenceContext.asUndetVar(descriptor.getReturnType());
3924
3925 Type resType;
3926 switch (tree.getMode()) {
3927 case NEW:
3928 if (!tree.expr.type.isRaw()) {
3929 resType = tree.expr.type;
3930 break;
3931 }
3932 default:
3933 resType = refType.getReturnType();
3934 }
3935
3936 Type incompatibleReturnType = resType;
3937
3938 if (returnType.hasTag(VOID)) {
3939 incompatibleReturnType = null;
3940 }
3941
3942 if (!returnType.hasTag(VOID) && !resType.hasTag(VOID)) {
3943 if (resType.isErroneous() ||
3944 new FunctionalReturnContext(checkContext).compatible(resType, returnType,
3945 checkContext.checkWarner(tree, resType, returnType))) {
3946 incompatibleReturnType = null;
3947 }
3948 }
3949
3950 if (incompatibleReturnType != null) {
3951 Fragment msg =
3952 Fragments.IncompatibleRetTypeInMref(Fragments.InconvertibleTypes(resType, descriptor.getReturnType()));
3953 checkContext.report(tree, diags.fragment(msg));
3954 } else {
3955 if (inferenceContext.free(refType)) {
3956 // we need to wait for inference to finish and then replace inference vars in the referent type
3957 inferenceContext.addFreeTypeListener(List.of(refType),
3958 instantiatedContext -> {
3959 tree.referentType = instantiatedContext.asInstType(refType);
3960 });
3961 } else {
3962 tree.referentType = refType;
3963 }
3964 }
3965
3966 if (!speculativeAttr) {
3967 if (!checkExConstraints(refType.getThrownTypes(), descriptor.getThrownTypes(), inferenceContext)) {
3968 log.error(tree, Errors.IncompatibleThrownTypesInMref(refType.getThrownTypes()));
3969 }
3970 }
3971 }
3972
3973 boolean checkExConstraints(
3974 List<Type> thrownByFuncExpr,
3975 List<Type> thrownAtFuncType,
3976 InferenceContext inferenceContext) {
3977 /** 18.2.5: Otherwise, let E1, ..., En be the types in the function type's throws clause that
3978 * are not proper types
3979 */
3980 List<Type> nonProperList = thrownAtFuncType.stream()
3981 .filter(e -> inferenceContext.free(e)).collect(List.collector());
3982 List<Type> properList = thrownAtFuncType.diff(nonProperList);
3983
3984 /** Let X1,...,Xm be the checked exception types that the lambda body can throw or
3985 * in the throws clause of the invocation type of the method reference's compile-time
3986 * declaration
3987 */
3988 List<Type> checkedList = thrownByFuncExpr.stream()
3989 .filter(e -> chk.isChecked(e)).collect(List.collector());
3990
3991 /** If n = 0 (the function type's throws clause consists only of proper types), then
3992 * if there exists some i (1 <= i <= m) such that Xi is not a subtype of any proper type
3993 * in the throws clause, the constraint reduces to false; otherwise, the constraint
3994 * reduces to true
3995 */
3996 ListBuffer<Type> uncaughtByProperTypes = new ListBuffer<>();
3997 for (Type checked : checkedList) {
3998 boolean isSubtype = false;
3999 for (Type proper : properList) {
4000 if (types.isSubtype(checked, proper)) {
4001 isSubtype = true;
4002 break;
4003 }
4004 }
4005 if (!isSubtype) {
4006 uncaughtByProperTypes.add(checked);
4007 }
4008 }
4009
4010 if (nonProperList.isEmpty() && !uncaughtByProperTypes.isEmpty()) {
4011 return false;
4012 }
4013
4014 /** If n > 0, the constraint reduces to a set of subtyping constraints:
4015 * for all i (1 <= i <= m), if Xi is not a subtype of any proper type in the
4016 * throws clause, then the constraints include, for all j (1 <= j <= n), <Xi <: Ej>
4017 */
4018 List<Type> nonProperAsUndet = inferenceContext.asUndetVars(nonProperList);
4019 uncaughtByProperTypes.forEach(checkedEx -> {
4020 nonProperAsUndet.forEach(nonProper -> {
4021 types.isSubtype(checkedEx, nonProper);
4022 });
4023 });
4024
4025 /** In addition, for all j (1 <= j <= n), the constraint reduces to the bound throws Ej
4026 */
4027 nonProperAsUndet.stream()
4028 .filter(t -> t.hasTag(UNDETVAR))
4029 .forEach(t -> ((UndetVar)t).setThrow());
4030 return true;
4031 }
4032
4033 /**
4034 * Set functional type info on the underlying AST. Note: as the target descriptor
4035 * might contain inference variables, we might need to register an hook in the
4036 * current inference context.
4037 */
4038 private void setFunctionalInfo(final Env<AttrContext> env, final JCFunctionalExpression fExpr,
4039 final Type pt, final Type descriptorType, final Type primaryTarget, final CheckContext checkContext) {
4040 if (checkContext.inferenceContext().free(descriptorType)) {
4041 checkContext.inferenceContext().addFreeTypeListener(List.of(pt, descriptorType),
4042 inferenceContext -> setFunctionalInfo(env, fExpr, pt, inferenceContext.asInstType(descriptorType),
4043 inferenceContext.asInstType(primaryTarget), checkContext));
4044 } else {
4045 fExpr.owner = env.info.scope.owner;
4046 if (pt.hasTag(CLASS)) {
4047 fExpr.target = primaryTarget;
4048 }
4049 if (checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
4050 pt != Type.recoveryType) {
4051 //check that functional interface class is well-formed
4052 try {
4053 /* Types.makeFunctionalInterfaceClass() may throw an exception
4054 * when it's executed post-inference. See the listener code
4055 * above.
4056 */
4057 ClassSymbol csym = types.makeFunctionalInterfaceClass(env,
4058 names.empty, fExpr.target, ABSTRACT);
4059 if (csym != null) {
4060 chk.checkImplementations(env.tree, csym, csym);
4061 try {
4062 //perform an additional functional interface check on the synthetic class,
4063 //as there may be spurious errors for raw targets - because of existing issues
4064 //with membership and inheritance (see JDK-8074570).
4065 csym.flags_field |= INTERFACE;
4066 types.findDescriptorType(csym.type);
4067 } catch (FunctionDescriptorLookupError err) {
4068 resultInfo.checkContext.report(fExpr,
4069 diags.fragment(Fragments.NoSuitableFunctionalIntfInst(fExpr.target)));
4070 }
4071 }
4072 } catch (Types.FunctionDescriptorLookupError ex) {
4073 JCDiagnostic cause = ex.getDiagnostic();
4074 resultInfo.checkContext.report(env.tree, cause);
4075 }
4076 }
4077 }
4078 }
4079
4080 public void visitParens(JCParens tree) {
4081 Type owntype = attribTree(tree.expr, env, resultInfo);
4082 result = check(tree, owntype, pkind(), resultInfo);
4083 Symbol sym = TreeInfo.symbol(tree);
4084 if (sym != null && sym.kind.matches(KindSelector.TYP_PCK) && sym.kind != Kind.ERR)
4085 log.error(tree.pos(), Errors.IllegalParenthesizedExpression);
4086 }
4087
4088 public void visitAssign(JCAssign tree) {
4089 Type owntype = attribTree(tree.lhs, env.dup(tree), varAssignmentInfo);
4090 Type capturedType = capture(owntype);
4091 attribExpr(tree.rhs, env, owntype);
4092 result = check(tree, capturedType, KindSelector.VAL, resultInfo);
4093 }
4094
4095 public void visitAssignop(JCAssignOp tree) {
4096 // Attribute arguments.
4097 Type owntype = attribTree(tree.lhs, env, varAssignmentInfo);
4098 Type operand = attribExpr(tree.rhs, env);
4099 // Find operator.
4100 Symbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag().noAssignOp(), owntype, operand);
4101 if (operator != operators.noOpSymbol &&
4102 !owntype.isErroneous() &&
4103 !operand.isErroneous()) {
4104 chk.checkDivZero(tree.rhs.pos(), operator, operand);
4105 chk.checkCastable(tree.rhs.pos(),
4106 operator.type.getReturnType(),
4107 owntype);
4108 chk.checkLossOfPrecision(tree.rhs.pos(), operand, owntype);
4109 }
4110 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4111 }
4112
4113 public void visitUnary(JCUnary tree) {
4114 // Attribute arguments.
4115 Type argtype = (tree.getTag().isIncOrDecUnaryOp())
4116 ? attribTree(tree.arg, env, varAssignmentInfo)
4117 : chk.checkNonVoid(tree.arg.pos(), attribExpr(tree.arg, env));
4118
4119 // Find operator.
4120 OperatorSymbol operator = tree.operator = operators.resolveUnary(tree, tree.getTag(), argtype);
4121 Type owntype = types.createErrorType(tree.type);
4122 if (operator != operators.noOpSymbol &&
4123 !argtype.isErroneous()) {
4124 owntype = (tree.getTag().isIncOrDecUnaryOp())
4125 ? tree.arg.type
4126 : operator.type.getReturnType();
4127 int opc = operator.opcode;
4128
4129 // If the argument is constant, fold it.
4130 if (argtype.constValue() != null) {
4131 Type ctype = cfolder.fold1(opc, argtype);
4132 if (ctype != null) {
4133 owntype = cfolder.coerce(ctype, owntype);
4134 }
4135 }
4136 }
4137 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4138 matchBindings = matchBindingsComputer.unary(tree, matchBindings);
4139 }
4140
4141 public void visitBinary(JCBinary tree) {
4142 // Attribute arguments.
4143 Type left = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.lhs, env));
4144 // x && y
4145 // include x's bindings when true in y
4146
4147 // x || y
4148 // include x's bindings when false in y
4149
4150 MatchBindings lhsBindings = matchBindings;
4151 List<BindingSymbol> propagatedBindings;
4152 switch (tree.getTag()) {
4153 case AND:
4154 propagatedBindings = lhsBindings.bindingsWhenTrue;
4155 break;
4156 case OR:
4157 propagatedBindings = lhsBindings.bindingsWhenFalse;
4158 break;
4159 default:
4160 propagatedBindings = List.nil();
4161 break;
4162 }
4163 Env<AttrContext> rhsEnv = bindingEnv(env, propagatedBindings);
4164 Type right;
4165 try {
4166 right = chk.checkNonVoid(tree.rhs.pos(), attribExpr(tree.rhs, rhsEnv));
4167 } finally {
4168 rhsEnv.info.scope.leave();
4169 }
4170
4171 matchBindings = matchBindingsComputer.binary(tree, lhsBindings, matchBindings);
4172
4173 // Find operator.
4174 OperatorSymbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag(), left, right);
4175 Type owntype = types.createErrorType(tree.type);
4176 if (operator != operators.noOpSymbol &&
4177 !left.isErroneous() &&
4178 !right.isErroneous()) {
4179 owntype = operator.type.getReturnType();
4180 int opc = operator.opcode;
4181 // If both arguments are constants, fold them.
4182 if (left.constValue() != null && right.constValue() != null) {
4183 Type ctype = cfolder.fold2(opc, left, right);
4184 if (ctype != null) {
4185 owntype = cfolder.coerce(ctype, owntype);
4186 }
4187 }
4188
4189 // Check that argument types of a reference ==, != are
4190 // castable to each other, (JLS 15.21). Note: unboxing
4191 // comparisons will not have an acmp* opc at this point.
4192 if ((opc == ByteCodes.if_acmpeq || opc == ByteCodes.if_acmpne)) {
4193 if (!types.isCastable(left, right, new Warner(tree.pos()))) {
4194 log.error(tree.pos(), Errors.IncomparableTypes(left, right));
4195 }
4196 }
4197
4198 chk.checkDivZero(tree.rhs.pos(), operator, right);
4199 }
4200 result = check(tree, owntype, KindSelector.VAL, resultInfo);
4201 }
4202
4203 public void visitTypeCast(final JCTypeCast tree) {
4204 Type clazztype = attribType(tree.clazz, env);
4205 chk.validate(tree.clazz, env, false);
4206 //a fresh environment is required for 292 inference to work properly ---
4207 //see Infer.instantiatePolymorphicSignatureInstance()
4208 Env<AttrContext> localEnv = env.dup(tree);
4209 //should we propagate the target type?
4210 final ResultInfo castInfo;
4211 JCExpression expr = TreeInfo.skipParens(tree.expr);
4212 boolean isPoly = (expr.hasTag(LAMBDA) || expr.hasTag(REFERENCE));
4213 if (isPoly) {
4214 //expression is a poly - we need to propagate target type info
4215 castInfo = new ResultInfo(KindSelector.VAL, clazztype,
4216 new Check.NestedCheckContext(resultInfo.checkContext) {
4217 @Override
4218 public boolean compatible(Type found, Type req, Warner warn) {
4219 return types.isCastable(found, req, warn);
4220 }
4221 });
4222 } else {
4223 //standalone cast - target-type info is not propagated
4224 castInfo = unknownExprInfo;
4225 }
4226 Type exprtype = attribTree(tree.expr, localEnv, castInfo);
4227 Type owntype = isPoly ? clazztype : chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
4228 if (exprtype.constValue() != null)
4229 owntype = cfolder.coerce(exprtype, owntype);
4230 result = check(tree, capture(owntype), KindSelector.VAL, resultInfo);
4231 if (!isPoly)
4232 chk.checkRedundantCast(localEnv, tree);
4233 }
4234
4235 public void visitTypeTest(JCInstanceOf tree) {
4236 Type exprtype = attribExpr(tree.expr, env);
4237 if (exprtype.isPrimitive()) {
4238 preview.checkSourceLevel(tree.expr.pos(), Feature.PRIMITIVE_PATTERNS);
4239 } else {
4240 exprtype = chk.checkNullOrRefType(
4241 tree.expr.pos(), exprtype);
4242 }
4243 Type clazztype;
4244 JCTree typeTree;
4245 if (tree.pattern.getTag() == BINDINGPATTERN ||
4246 tree.pattern.getTag() == RECORDPATTERN) {
4247 attribExpr(tree.pattern, env, exprtype);
4248 clazztype = tree.pattern.type;
4249 if (types.isSubtype(exprtype, clazztype) &&
4250 !exprtype.isErroneous() && !clazztype.isErroneous() &&
4251 tree.pattern.getTag() != RECORDPATTERN) {
4252 if (!allowUnconditionalPatternsInstanceOf) {
4253 log.error(DiagnosticFlag.SOURCE_LEVEL, tree.pos(),
4254 Feature.UNCONDITIONAL_PATTERN_IN_INSTANCEOF.error(this.sourceName));
4255 }
4256 }
4257 typeTree = TreeInfo.primaryPatternTypeTree((JCPattern) tree.pattern);
4258 } else {
4259 clazztype = attribType(tree.pattern, env);
4260 typeTree = tree.pattern;
4261 chk.validate(typeTree, env, false);
4262 }
4263 if (clazztype.isPrimitive()) {
4264 preview.checkSourceLevel(tree.pattern.pos(), Feature.PRIMITIVE_PATTERNS);
4265 } else {
4266 if (!clazztype.hasTag(TYPEVAR)) {
4267 clazztype = chk.checkClassOrArrayType(typeTree.pos(), clazztype);
4268 }
4269 if (!clazztype.isErroneous() && !types.isReifiable(clazztype)) {
4270 boolean valid = false;
4271 if (allowReifiableTypesInInstanceof) {
4272 valid = checkCastablePattern(tree.expr.pos(), exprtype, clazztype);
4273 } else {
4274 log.error(DiagnosticFlag.SOURCE_LEVEL, tree.pos(),
4275 Feature.REIFIABLE_TYPES_INSTANCEOF.error(this.sourceName));
4276 allowReifiableTypesInInstanceof = true;
4277 }
4278 if (!valid) {
4279 clazztype = types.createErrorType(clazztype);
4280 }
4281 }
4282 }
4283 chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
4284 result = check(tree, syms.booleanType, KindSelector.VAL, resultInfo);
4285 }
4286
4287 private boolean checkCastablePattern(DiagnosticPosition pos,
4288 Type exprType,
4289 Type pattType) {
4290 Warner warner = new Warner();
4291 // if any type is erroneous, the problem is reported elsewhere
4292 if (exprType.isErroneous() || pattType.isErroneous()) {
4293 return false;
4294 }
4295 if (!types.isCastable(exprType, pattType, warner)) {
4296 chk.basicHandler.report(pos,
4297 diags.fragment(Fragments.InconvertibleTypes(exprType, pattType)));
4298 return false;
4299 } else if ((exprType.isPrimitive() || pattType.isPrimitive()) &&
4300 (!exprType.isPrimitive() || !pattType.isPrimitive() || !types.isSameType(exprType, pattType))) {
4301 preview.checkSourceLevel(pos, Feature.PRIMITIVE_PATTERNS);
4302 return true;
4303 } else if (warner.hasLint(LintCategory.UNCHECKED)) {
4304 log.error(pos,
4305 Errors.InstanceofReifiableNotSafe(exprType, pattType));
4306 return false;
4307 } else {
4308 return true;
4309 }
4310 }
4311
4312 @Override
4313 public void visitAnyPattern(JCAnyPattern tree) {
4314 result = tree.type = resultInfo.pt;
4315 }
4316
4317 public void visitBindingPattern(JCBindingPattern tree) {
4318 Type type;
4319 if (tree.var.vartype != null) {
4320 type = attribType(tree.var.vartype, env);
4321 } else {
4322 type = resultInfo.pt;
4323 }
4324 tree.type = tree.var.type = type;
4325 BindingSymbol v = new BindingSymbol(tree.var.mods.flags, tree.var.name, type, env.info.scope.owner);
4326 v.pos = tree.pos;
4327 tree.var.sym = v;
4328 if (chk.checkUnique(tree.var.pos(), v, env.info.scope)) {
4329 chk.checkTransparentVar(tree.var.pos(), v, env.info.scope);
4330 }
4331 chk.validate(tree.var.vartype, env, true);
4332 if (tree.var.isImplicitlyTyped()) {
4333 setSyntheticVariableType(tree.var, type == Type.noType ? syms.errType
4334 : type);
4335 }
4336 annotate.annotateLater(tree.var.mods.annotations, env, v, tree.var);
4337 if (!tree.var.isImplicitlyTyped()) {
4338 annotate.queueScanTreeAndTypeAnnotate(tree.var.vartype, env, v, tree.var);
4339 }
4340 annotate.flush();
4341 result = tree.type;
4342 if (v.isUnnamedVariable()) {
4343 matchBindings = MatchBindingsComputer.EMPTY;
4344 } else {
4345 matchBindings = new MatchBindings(List.of(v), List.nil());
4346 }
4347 }
4348
4349 @Override
4350 public void visitRecordPattern(JCRecordPattern tree) {
4351 Type site;
4352
4353 if (tree.deconstructor == null) {
4354 log.error(tree.pos(), Errors.DeconstructionPatternVarNotAllowed);
4355 tree.record = syms.errSymbol;
4356 site = tree.type = types.createErrorType(tree.record.type);
4357 } else {
4358 Type type = attribType(tree.deconstructor, env);
4359 if (type.isRaw() && type.tsym.getTypeParameters().nonEmpty()) {
4360 Type inferred = infer.instantiatePatternType(resultInfo.pt, type.tsym);
4361 if (inferred == null) {
4362 log.error(tree.pos(), Errors.PatternTypeCannotInfer);
4363 } else {
4364 type = inferred;
4365 }
4366 }
4367 tree.type = tree.deconstructor.type = type;
4368 site = types.capture(tree.type);
4369 }
4370
4371 List<Type> expectedRecordTypes;
4372 if (site.tsym.kind == Kind.TYP && ((ClassSymbol) site.tsym).isRecord()) {
4373 ClassSymbol record = (ClassSymbol) site.tsym;
4374 expectedRecordTypes = record.getRecordComponents()
4375 .stream()
4376 .map(rc -> types.memberType(site, rc))
4377 .map(t -> types.upward(t, types.captures(t)).baseType())
4378 .collect(List.collector());
4379 tree.record = record;
4380 } else {
4381 log.error(tree.pos(), Errors.DeconstructionPatternOnlyRecords(site.tsym));
4382 expectedRecordTypes = Stream.generate(() -> types.createErrorType(tree.type))
4383 .limit(tree.nested.size())
4384 .collect(List.collector());
4385 tree.record = syms.errSymbol;
4386 }
4387 ListBuffer<BindingSymbol> outBindings = new ListBuffer<>();
4388 List<Type> recordTypes = expectedRecordTypes;
4389 List<JCPattern> nestedPatterns = tree.nested;
4390 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
4391 try {
4392 while (recordTypes.nonEmpty() && nestedPatterns.nonEmpty()) {
4393 attribExpr(nestedPatterns.head, localEnv, recordTypes.head);
4394 checkCastablePattern(nestedPatterns.head.pos(), recordTypes.head, nestedPatterns.head.type);
4395 outBindings.addAll(matchBindings.bindingsWhenTrue);
4396 matchBindings.bindingsWhenTrue.forEach(localEnv.info.scope::enter);
4397 nestedPatterns = nestedPatterns.tail;
4398 recordTypes = recordTypes.tail;
4399 }
4400 if (recordTypes.nonEmpty() || nestedPatterns.nonEmpty()) {
4401 while (nestedPatterns.nonEmpty()) {
4402 attribExpr(nestedPatterns.head, localEnv, Type.noType);
4403 nestedPatterns = nestedPatterns.tail;
4404 }
4405 List<Type> nestedTypes =
4406 tree.nested.stream().map(p -> p.type).collect(List.collector());
4407 log.error(tree.pos(),
4408 Errors.IncorrectNumberOfNestedPatterns(expectedRecordTypes,
4409 nestedTypes));
4410 }
4411 } finally {
4412 localEnv.info.scope.leave();
4413 }
4414 chk.validate(tree.deconstructor, env, true);
4415 result = tree.type;
4416 matchBindings = new MatchBindings(outBindings.toList(), List.nil());
4417 }
4418
4419 public void visitIndexed(JCArrayAccess tree) {
4420 Type owntype = types.createErrorType(tree.type);
4421 Type atype = attribExpr(tree.indexed, env);
4422 attribExpr(tree.index, env, syms.intType);
4423 if (types.isArray(atype))
4424 owntype = types.elemtype(atype);
4425 else if (!atype.hasTag(ERROR))
4426 log.error(tree.pos(), Errors.ArrayReqButFound(atype));
4427 if (!pkind().contains(KindSelector.VAL))
4428 owntype = capture(owntype);
4429 result = check(tree, owntype, KindSelector.VAR, resultInfo);
4430 }
4431
4432 public void visitIdent(JCIdent tree) {
4433 Symbol sym;
4434
4435 // Find symbol
4436 if (pt().hasTag(METHOD) || pt().hasTag(FORALL)) {
4437 // If we are looking for a method, the prototype `pt' will be a
4438 // method type with the type of the call's arguments as parameters.
4439 env.info.pendingResolutionPhase = null;
4440 sym = rs.resolveMethod(tree.pos(), env, tree.name, pt().getParameterTypes(), pt().getTypeArguments());
4441 } else if (tree.sym != null && tree.sym.kind != VAR) {
4442 sym = tree.sym;
4443 } else {
4444 sym = rs.resolveIdent(tree.pos(), env, tree.name, pkind());
4445 }
4446 tree.sym = sym;
4447
4448 // Also find the environment current for the class where
4449 // sym is defined (`symEnv').
4450 Env<AttrContext> symEnv = env;
4451 if (env.enclClass.sym.owner.kind != PCK && // we are in an inner class
4452 sym.kind.matches(KindSelector.VAL_MTH) &&
4453 sym.owner.kind == TYP &&
4454 tree.name != names._this && tree.name != names._super) {
4455
4456 // Find environment in which identifier is defined.
4457 while (symEnv.outer != null &&
4458 !sym.isMemberOf(symEnv.enclClass.sym, types)) {
4459 symEnv = symEnv.outer;
4460 }
4461 }
4462
4463 // If symbol is a variable, ...
4464 if (sym.kind == VAR) {
4465 VarSymbol v = (VarSymbol)sym;
4466
4467 // ..., evaluate its initializer, if it has one, and check for
4468 // illegal forward reference.
4469 checkInit(tree, env, v, false);
4470
4471 // If we are expecting a variable (as opposed to a value), check
4472 // that the variable is assignable in the current environment.
4473 if (KindSelector.ASG.subset(pkind()))
4474 checkAssignable(tree.pos(), v, null, env);
4475 }
4476
4477 Env<AttrContext> env1 = env;
4478 if (sym.kind != ERR && sym.kind != TYP &&
4479 sym.owner != null && sym.owner != env1.enclClass.sym) {
4480 // If the found symbol is inaccessible, then it is
4481 // accessed through an enclosing instance. Locate this
4482 // enclosing instance:
4483 while (env1.outer != null && !rs.isAccessible(env, env1.enclClass.sym.type, sym))
4484 env1 = env1.outer;
4485 }
4486
4487 if (env.info.isSerializable) {
4488 chk.checkAccessFromSerializableElement(tree, env.info.isSerializableLambda);
4489 }
4490
4491 result = checkId(tree, env1.enclClass.sym.type, sym, env, resultInfo);
4492 }
4493
4494 public void visitSelect(JCFieldAccess tree) {
4495 // Determine the expected kind of the qualifier expression.
4496 KindSelector skind = KindSelector.NIL;
4497 if (tree.name == names._this || tree.name == names._super ||
4498 tree.name == names._class)
4499 {
4500 skind = KindSelector.TYP;
4501 } else {
4502 if (pkind().contains(KindSelector.PCK))
4503 skind = KindSelector.of(skind, KindSelector.PCK);
4504 if (pkind().contains(KindSelector.TYP))
4505 skind = KindSelector.of(skind, KindSelector.TYP, KindSelector.PCK);
4506 if (pkind().contains(KindSelector.VAL_MTH))
4507 skind = KindSelector.of(skind, KindSelector.VAL, KindSelector.TYP);
4508 }
4509
4510 // Attribute the qualifier expression, and determine its symbol (if any).
4511 Type site = attribTree(tree.selected, env, new ResultInfo(skind, Type.noType));
4512 if (!pkind().contains(KindSelector.TYP_PCK))
4513 site = capture(site); // Capture field access
4514
4515 // don't allow T.class T[].class, etc
4516 if (skind == KindSelector.TYP) {
4517 Type elt = site;
4518 while (elt.hasTag(ARRAY))
4519 elt = ((ArrayType)elt).elemtype;
4520 if (elt.hasTag(TYPEVAR)) {
4521 log.error(tree.pos(), Errors.TypeVarCantBeDeref);
4522 result = tree.type = types.createErrorType(tree.name, site.tsym, site);
4523 tree.sym = tree.type.tsym;
4524 return ;
4525 }
4526 }
4527
4528 // If qualifier symbol is a type or `super', assert `selectSuper'
4529 // for the selection. This is relevant for determining whether
4530 // protected symbols are accessible.
4531 Symbol sitesym = TreeInfo.symbol(tree.selected);
4532 boolean selectSuperPrev = env.info.selectSuper;
4533 env.info.selectSuper =
4534 sitesym != null &&
4535 sitesym.name == names._super;
4536
4537 // Determine the symbol represented by the selection.
4538 env.info.pendingResolutionPhase = null;
4539 Symbol sym = selectSym(tree, sitesym, site, env, resultInfo);
4540 if (sym.kind == VAR && sym.name != names._super && env.info.defaultSuperCallSite != null) {
4541 log.error(tree.selected.pos(), Errors.NotEnclClass(site.tsym));
4542 sym = syms.errSymbol;
4543 }
4544 if (sym.exists() && !isType(sym) && pkind().contains(KindSelector.TYP_PCK)) {
4545 site = capture(site);
4546 sym = selectSym(tree, sitesym, site, env, resultInfo);
4547 }
4548 boolean varArgs = env.info.lastResolveVarargs();
4549 tree.sym = sym;
4550
4551 if (site.hasTag(TYPEVAR) && !isType(sym) && sym.kind != ERR) {
4552 site = types.skipTypeVars(site, true);
4553 }
4554
4555 // If that symbol is a variable, ...
4556 if (sym.kind == VAR) {
4557 VarSymbol v = (VarSymbol)sym;
4558
4559 // ..., evaluate its initializer, if it has one, and check for
4560 // illegal forward reference.
4561 checkInit(tree, env, v, true);
4562
4563 // If we are expecting a variable (as opposed to a value), check
4564 // that the variable is assignable in the current environment.
4565 if (KindSelector.ASG.subset(pkind()))
4566 checkAssignable(tree.pos(), v, tree.selected, env);
4567 }
4568
4569 if (sitesym != null &&
4570 sitesym.kind == VAR &&
4571 ((VarSymbol)sitesym).isResourceVariable() &&
4572 sym.kind == MTH &&
4573 sym.name.equals(names.close) &&
4574 sym.overrides(syms.autoCloseableClose, sitesym.type.tsym, types, true)) {
4575 env.info.lint.logIfEnabled(tree, LintWarnings.TryExplicitCloseCall);
4576 }
4577
4578 // Disallow selecting a type from an expression
4579 if (isType(sym) && (sitesym == null || !sitesym.kind.matches(KindSelector.TYP_PCK))) {
4580 tree.type = check(tree.selected, pt(),
4581 sitesym == null ?
4582 KindSelector.VAL : sitesym.kind.toSelector(),
4583 new ResultInfo(KindSelector.TYP_PCK, pt()));
4584 }
4585
4586 if (isType(sitesym)) {
4587 if (sym.name != names._this && sym.name != names._super) {
4588 // Check if type-qualified fields or methods are static (JLS)
4589 if ((sym.flags() & STATIC) == 0 &&
4590 sym.name != names._super &&
4591 (sym.kind == VAR || sym.kind == MTH)) {
4592 rs.accessBase(rs.new StaticError(sym),
4593 tree.pos(), site, sym.name, true);
4594 }
4595 }
4596 } else if (sym.kind != ERR &&
4597 (sym.flags() & STATIC) != 0 &&
4598 sym.name != names._class) {
4599 // If the qualified item is not a type and the selected item is static, report
4600 // a warning. Make allowance for the class of an array type e.g. Object[].class)
4601 if (!sym.owner.isAnonymous()) {
4602 chk.lint.logIfEnabled(tree, LintWarnings.StaticNotQualifiedByType(sym.kind.kindName(), sym.owner));
4603 } else {
4604 chk.lint.logIfEnabled(tree, LintWarnings.StaticNotQualifiedByType2(sym.kind.kindName()));
4605 }
4606 }
4607
4608 // If we are selecting an instance member via a `super', ...
4609 if (env.info.selectSuper && (sym.flags() & STATIC) == 0) {
4610
4611 // Check that super-qualified symbols are not abstract (JLS)
4612 rs.checkNonAbstract(tree.pos(), sym);
4613
4614 if (site.isRaw()) {
4615 // Determine argument types for site.
4616 Type site1 = types.asSuper(env.enclClass.sym.type, site.tsym);
4617 if (site1 != null) site = site1;
4618 }
4619 }
4620
4621 if (env.info.isSerializable) {
4622 chk.checkAccessFromSerializableElement(tree, env.info.isSerializableLambda);
4623 }
4624
4625 env.info.selectSuper = selectSuperPrev;
4626 result = checkId(tree, site, sym, env, resultInfo);
4627 }
4628 //where
4629 /** Determine symbol referenced by a Select expression,
4630 *
4631 * @param tree The select tree.
4632 * @param site The type of the selected expression,
4633 * @param env The current environment.
4634 * @param resultInfo The current result.
4635 */
4636 private Symbol selectSym(JCFieldAccess tree,
4637 Symbol location,
4638 Type site,
4639 Env<AttrContext> env,
4640 ResultInfo resultInfo) {
4641 DiagnosticPosition pos = tree.pos();
4642 Name name = tree.name;
4643 switch (site.getTag()) {
4644 case PACKAGE:
4645 return rs.accessBase(
4646 rs.findIdentInPackage(pos, env, site.tsym, name, resultInfo.pkind),
4647 pos, location, site, name, true);
4648 case ARRAY:
4649 case CLASS:
4650 if (resultInfo.pt.hasTag(METHOD) || resultInfo.pt.hasTag(FORALL)) {
4651 return rs.resolveQualifiedMethod(
4652 pos, env, location, site, name, resultInfo.pt.getParameterTypes(), resultInfo.pt.getTypeArguments());
4653 } else if (name == names._this || name == names._super) {
4654 return rs.resolveSelf(pos, env, site.tsym, name);
4655 } else if (name == names._class) {
4656 // In this case, we have already made sure in
4657 // visitSelect that qualifier expression is a type.
4658 return syms.getClassField(site, types);
4659 } else {
4660 // We are seeing a plain identifier as selector.
4661 Symbol sym = rs.findIdentInType(pos, env, site, name, resultInfo.pkind);
4662 sym = rs.accessBase(sym, pos, location, site, name, true);
4663 return sym;
4664 }
4665 case WILDCARD:
4666 throw new AssertionError(tree);
4667 case TYPEVAR:
4668 // Normally, site.getUpperBound() shouldn't be null.
4669 // It should only happen during memberEnter/attribBase
4670 // when determining the supertype which *must* be
4671 // done before attributing the type variables. In
4672 // other words, we are seeing this illegal program:
4673 // class B<T> extends A<T.foo> {}
4674 Symbol sym = (site.getUpperBound() != null)
4675 ? selectSym(tree, location, capture(site.getUpperBound()), env, resultInfo)
4676 : null;
4677 if (sym == null) {
4678 log.error(pos, Errors.TypeVarCantBeDeref);
4679 return syms.errSymbol;
4680 } else {
4681 Symbol sym2 = (sym.flags() & Flags.PRIVATE) != 0 ?
4682 rs.new AccessError(env, site, sym) :
4683 sym;
4684 rs.accessBase(sym2, pos, location, site, name, true);
4685 return sym;
4686 }
4687 case ERROR:
4688 // preserve identifier names through errors
4689 return types.createErrorType(name, site.tsym, site).tsym;
4690 default:
4691 // The qualifier expression is of a primitive type -- only
4692 // .class is allowed for these.
4693 if (name == names._class) {
4694 // In this case, we have already made sure in Select that
4695 // qualifier expression is a type.
4696 return syms.getClassField(site, types);
4697 } else {
4698 log.error(pos, Errors.CantDeref(site));
4699 return syms.errSymbol;
4700 }
4701 }
4702 }
4703
4704 /** Determine type of identifier or select expression and check that
4705 * (1) the referenced symbol is not deprecated
4706 * (2) the symbol's type is safe (@see checkSafe)
4707 * (3) if symbol is a variable, check that its type and kind are
4708 * compatible with the prototype and protokind.
4709 * (4) if symbol is an instance field of a raw type,
4710 * which is being assigned to, issue an unchecked warning if its
4711 * type changes under erasure.
4712 * (5) if symbol is an instance method of a raw type, issue an
4713 * unchecked warning if its argument types change under erasure.
4714 * If checks succeed:
4715 * If symbol is a constant, return its constant type
4716 * else if symbol is a method, return its result type
4717 * otherwise return its type.
4718 * Otherwise return errType.
4719 *
4720 * @param tree The syntax tree representing the identifier
4721 * @param site If this is a select, the type of the selected
4722 * expression, otherwise the type of the current class.
4723 * @param sym The symbol representing the identifier.
4724 * @param env The current environment.
4725 * @param resultInfo The expected result
4726 */
4727 Type checkId(JCTree tree,
4728 Type site,
4729 Symbol sym,
4730 Env<AttrContext> env,
4731 ResultInfo resultInfo) {
4732 return (resultInfo.pt.hasTag(FORALL) || resultInfo.pt.hasTag(METHOD)) ?
4733 checkMethodIdInternal(tree, site, sym, env, resultInfo) :
4734 checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
4735 }
4736
4737 Type checkMethodIdInternal(JCTree tree,
4738 Type site,
4739 Symbol sym,
4740 Env<AttrContext> env,
4741 ResultInfo resultInfo) {
4742 if (resultInfo.pkind.contains(KindSelector.POLY)) {
4743 return attrRecover.recoverMethodInvocation(tree, site, sym, env, resultInfo);
4744 } else {
4745 return checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
4746 }
4747 }
4748
4749 Type checkIdInternal(JCTree tree,
4750 Type site,
4751 Symbol sym,
4752 Type pt,
4753 Env<AttrContext> env,
4754 ResultInfo resultInfo) {
4755 Type owntype; // The computed type of this identifier occurrence.
4756 switch (sym.kind) {
4757 case TYP:
4758 // For types, the computed type equals the symbol's type,
4759 // except for two situations:
4760 owntype = sym.type;
4761 if (owntype.hasTag(CLASS)) {
4762 chk.checkForBadAuxiliaryClassAccess(tree.pos(), env, (ClassSymbol)sym);
4763 Type ownOuter = owntype.getEnclosingType();
4764
4765 // (a) If the symbol's type is parameterized, erase it
4766 // because no type parameters were given.
4767 // We recover generic outer type later in visitTypeApply.
4768 if (owntype.tsym.type.getTypeArguments().nonEmpty()) {
4769 owntype = types.erasure(owntype);
4770 }
4771
4772 // (b) If the symbol's type is an inner class, then
4773 // we have to interpret its outer type as a superclass
4774 // of the site type. Example:
4775 //
4776 // class Tree<A> { class Visitor { ... } }
4777 // class PointTree extends Tree<Point> { ... }
4778 // ...PointTree.Visitor...
4779 //
4780 // Then the type of the last expression above is
4781 // Tree<Point>.Visitor.
4782 else if (ownOuter.hasTag(CLASS) && site != ownOuter) {
4783 Type normOuter = site;
4784 if (normOuter.hasTag(CLASS)) {
4785 normOuter = types.asEnclosingSuper(site, ownOuter.tsym);
4786 }
4787 if (normOuter == null) // perhaps from an import
4788 normOuter = types.erasure(ownOuter);
4789 if (normOuter != ownOuter)
4790 owntype = new ClassType(
4791 normOuter, List.nil(), owntype.tsym,
4792 owntype.getMetadata());
4793 }
4794 }
4795 break;
4796 case VAR:
4797 VarSymbol v = (VarSymbol)sym;
4798
4799 if (env.info.enclVar != null
4800 && v.type.hasTag(NONE)) {
4801 //self reference to implicitly typed variable declaration
4802 log.error(TreeInfo.positionFor(v, env.enclClass), Errors.CantInferLocalVarType(v.name, Fragments.LocalSelfRef));
4803 return tree.type = v.type = types.createErrorType(v.type);
4804 }
4805
4806 // Test (4): if symbol is an instance field of a raw type,
4807 // which is being assigned to, issue an unchecked warning if
4808 // its type changes under erasure.
4809 if (KindSelector.ASG.subset(pkind()) &&
4810 v.owner.kind == TYP &&
4811 (v.flags() & STATIC) == 0 &&
4812 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
4813 Type s = types.asOuterSuper(site, v.owner);
4814 if (s != null &&
4815 s.isRaw() &&
4816 !types.isSameType(v.type, v.erasure(types))) {
4817 chk.warnUnchecked(tree.pos(), LintWarnings.UncheckedAssignToVar(v, s));
4818 }
4819 }
4820 // The computed type of a variable is the type of the
4821 // variable symbol, taken as a member of the site type.
4822 owntype = (sym.owner.kind == TYP &&
4823 sym.name != names._this && sym.name != names._super)
4824 ? types.memberType(site, sym)
4825 : sym.type;
4826
4827 // If the variable is a constant, record constant value in
4828 // computed type.
4829 if (v.getConstValue() != null && isStaticReference(tree))
4830 owntype = owntype.constType(v.getConstValue());
4831
4832 if (resultInfo.pkind == KindSelector.VAL) {
4833 owntype = capture(owntype); // capture "names as expressions"
4834 }
4835 break;
4836 case MTH: {
4837 owntype = checkMethod(site, sym,
4838 new ResultInfo(resultInfo.pkind, resultInfo.pt.getReturnType(), resultInfo.checkContext, resultInfo.checkMode),
4839 env, TreeInfo.args(env.tree), resultInfo.pt.getParameterTypes(),
4840 resultInfo.pt.getTypeArguments());
4841 chk.checkRestricted(tree.pos(), sym);
4842 break;
4843 }
4844 case PCK: case ERR:
4845 owntype = sym.type;
4846 break;
4847 default:
4848 throw new AssertionError("unexpected kind: " + sym.kind +
4849 " in tree " + tree);
4850 }
4851
4852 // Emit a `deprecation' warning if symbol is deprecated.
4853 // (for constructors (but not for constructor references), the error
4854 // was given when the constructor was resolved)
4855
4856 if (sym.name != names.init || tree.hasTag(REFERENCE)) {
4857 chk.checkDeprecated(tree.pos(), env.info.scope.owner, sym);
4858 chk.checkSunAPI(tree.pos(), sym);
4859 chk.checkProfile(tree.pos(), sym);
4860 chk.checkPreview(tree.pos(), env.info.scope.owner, site, sym);
4861 }
4862
4863 if (pt.isErroneous()) {
4864 owntype = types.createErrorType(owntype);
4865 }
4866
4867 // If symbol is a variable, check that its type and
4868 // kind are compatible with the prototype and protokind.
4869 return check(tree, owntype, sym.kind.toSelector(), resultInfo);
4870 }
4871
4872 /** Check that variable is initialized and evaluate the variable's
4873 * initializer, if not yet done. Also check that variable is not
4874 * referenced before it is defined.
4875 * @param tree The tree making up the variable reference.
4876 * @param env The current environment.
4877 * @param v The variable's symbol.
4878 */
4879 private void checkInit(JCTree tree,
4880 Env<AttrContext> env,
4881 VarSymbol v,
4882 boolean onlyWarning) {
4883 // A forward reference is diagnosed if the declaration position
4884 // of the variable is greater than the current tree position
4885 // and the tree and variable definition occur in the same class
4886 // definition. Note that writes don't count as references.
4887 // This check applies only to class and instance
4888 // variables. Local variables follow different scope rules,
4889 // and are subject to definite assignment checking.
4890 Env<AttrContext> initEnv = enclosingInitEnv(env);
4891 if (initEnv != null &&
4892 (initEnv.info.enclVar == v || v.pos > tree.pos) &&
4893 v.owner.kind == TYP &&
4894 v.owner == env.info.scope.owner.enclClass() &&
4895 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env) &&
4896 (!env.tree.hasTag(ASSIGN) ||
4897 TreeInfo.skipParens(((JCAssign) env.tree).lhs) != tree)) {
4898 if (!onlyWarning || isStaticEnumField(v)) {
4899 Error errkey = (initEnv.info.enclVar == v) ?
4900 Errors.IllegalSelfRef : Errors.IllegalForwardRef;
4901 log.error(tree.pos(), errkey);
4902 } else if (useBeforeDeclarationWarning) {
4903 Warning warnkey = (initEnv.info.enclVar == v) ?
4904 Warnings.SelfRef(v) : Warnings.ForwardRef(v);
4905 log.warning(tree.pos(), warnkey);
4906 }
4907 }
4908
4909 v.getConstValue(); // ensure initializer is evaluated
4910
4911 checkEnumInitializer(tree, env, v);
4912 }
4913
4914 /**
4915 * Returns the enclosing init environment associated with this env (if any). An init env
4916 * can be either a field declaration env or a static/instance initializer env.
4917 */
4918 Env<AttrContext> enclosingInitEnv(Env<AttrContext> env) {
4919 while (true) {
4920 switch (env.tree.getTag()) {
4921 case VARDEF:
4922 JCVariableDecl vdecl = (JCVariableDecl)env.tree;
4923 if (vdecl.sym.owner.kind == TYP) {
4924 //field
4925 return env;
4926 }
4927 break;
4928 case BLOCK:
4929 if (env.next.tree.hasTag(CLASSDEF)) {
4930 //instance/static initializer
4931 return env;
4932 }
4933 break;
4934 case METHODDEF:
4935 case CLASSDEF:
4936 case TOPLEVEL:
4937 return null;
4938 }
4939 Assert.checkNonNull(env.next);
4940 env = env.next;
4941 }
4942 }
4943
4944 /**
4945 * Check for illegal references to static members of enum. In
4946 * an enum type, constructors and initializers may not
4947 * reference its static members unless they are constant.
4948 *
4949 * @param tree The tree making up the variable reference.
4950 * @param env The current environment.
4951 * @param v The variable's symbol.
4952 * @jls 8.9 Enum Types
4953 */
4954 private void checkEnumInitializer(JCTree tree, Env<AttrContext> env, VarSymbol v) {
4955 // JLS:
4956 //
4957 // "It is a compile-time error to reference a static field
4958 // of an enum type that is not a compile-time constant
4959 // (15.28) from constructors, instance initializer blocks,
4960 // or instance variable initializer expressions of that
4961 // type. It is a compile-time error for the constructors,
4962 // instance initializer blocks, or instance variable
4963 // initializer expressions of an enum constant e to refer
4964 // to itself or to an enum constant of the same type that
4965 // is declared to the right of e."
4966 if (isStaticEnumField(v)) {
4967 ClassSymbol enclClass = env.info.scope.owner.enclClass();
4968
4969 if (enclClass == null || enclClass.owner == null)
4970 return;
4971
4972 // See if the enclosing class is the enum (or a
4973 // subclass thereof) declaring v. If not, this
4974 // reference is OK.
4975 if (v.owner != enclClass && !types.isSubtype(enclClass.type, v.owner.type))
4976 return;
4977
4978 // If the reference isn't from an initializer, then
4979 // the reference is OK.
4980 if (!Resolve.isInitializer(env))
4981 return;
4982
4983 log.error(tree.pos(), Errors.IllegalEnumStaticRef);
4984 }
4985 }
4986
4987 /** Is the given symbol a static, non-constant field of an Enum?
4988 * Note: enum literals should not be regarded as such
4989 */
4990 private boolean isStaticEnumField(VarSymbol v) {
4991 return Flags.isEnum(v.owner) &&
4992 Flags.isStatic(v) &&
4993 !Flags.isConstant(v) &&
4994 v.name != names._class;
4995 }
4996
4997 /**
4998 * Check that method arguments conform to its instantiation.
4999 **/
5000 public Type checkMethod(Type site,
5001 final Symbol sym,
5002 ResultInfo resultInfo,
5003 Env<AttrContext> env,
5004 final List<JCExpression> argtrees,
5005 List<Type> argtypes,
5006 List<Type> typeargtypes) {
5007 // Test (5): if symbol is an instance method of a raw type, issue
5008 // an unchecked warning if its argument types change under erasure.
5009 if ((sym.flags() & STATIC) == 0 &&
5010 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
5011 Type s = types.asOuterSuper(site, sym.owner);
5012 if (s != null && s.isRaw() &&
5013 !types.isSameTypes(sym.type.getParameterTypes(),
5014 sym.erasure(types).getParameterTypes())) {
5015 chk.warnUnchecked(env.tree.pos(), LintWarnings.UncheckedCallMbrOfRawType(sym, s));
5016 }
5017 }
5018
5019 if (env.info.defaultSuperCallSite != null) {
5020 for (Type sup : types.interfaces(env.enclClass.type).prepend(types.supertype((env.enclClass.type)))) {
5021 if (!sup.tsym.isSubClass(sym.enclClass(), types) ||
5022 types.isSameType(sup, env.info.defaultSuperCallSite)) continue;
5023 List<MethodSymbol> icand_sup =
5024 types.interfaceCandidates(sup, (MethodSymbol)sym);
5025 if (icand_sup.nonEmpty() &&
5026 icand_sup.head != sym &&
5027 icand_sup.head.overrides(sym, icand_sup.head.enclClass(), types, true)) {
5028 log.error(env.tree.pos(),
5029 Errors.IllegalDefaultSuperCall(env.info.defaultSuperCallSite, Fragments.OverriddenDefault(sym, sup)));
5030 break;
5031 }
5032 }
5033 env.info.defaultSuperCallSite = null;
5034 }
5035
5036 if (sym.isStatic() && site.isInterface() && env.tree.hasTag(APPLY)) {
5037 JCMethodInvocation app = (JCMethodInvocation)env.tree;
5038 if (app.meth.hasTag(SELECT) &&
5039 !TreeInfo.isStaticSelector(((JCFieldAccess)app.meth).selected, names)) {
5040 log.error(env.tree.pos(), Errors.IllegalStaticIntfMethCall(site));
5041 }
5042 }
5043
5044 // Compute the identifier's instantiated type.
5045 // For methods, we need to compute the instance type by
5046 // Resolve.instantiate from the symbol's type as well as
5047 // any type arguments and value arguments.
5048 Warner noteWarner = new Warner();
5049 try {
5050 Type owntype = rs.checkMethod(
5051 env,
5052 site,
5053 sym,
5054 resultInfo,
5055 argtypes,
5056 typeargtypes,
5057 noteWarner);
5058
5059 DeferredAttr.DeferredTypeMap<Void> checkDeferredMap =
5060 deferredAttr.new DeferredTypeMap<>(DeferredAttr.AttrMode.CHECK, sym, env.info.pendingResolutionPhase);
5061
5062 argtypes = argtypes.map(checkDeferredMap);
5063
5064 if (noteWarner.hasNonSilentLint(LintCategory.UNCHECKED)) {
5065 chk.warnUnchecked(env.tree.pos(), LintWarnings.UncheckedMethInvocationApplied(kindName(sym),
5066 sym.name,
5067 rs.methodArguments(sym.type.getParameterTypes()),
5068 rs.methodArguments(argtypes.map(checkDeferredMap)),
5069 kindName(sym.location()),
5070 sym.location()));
5071 if (resultInfo.pt != Infer.anyPoly ||
5072 !owntype.hasTag(METHOD) ||
5073 !owntype.isPartial()) {
5074 //if this is not a partially inferred method type, erase return type. Otherwise,
5075 //erasure is carried out in PartiallyInferredMethodType.check().
5076 owntype = new MethodType(owntype.getParameterTypes(),
5077 types.erasure(owntype.getReturnType()),
5078 types.erasure(owntype.getThrownTypes()),
5079 syms.methodClass);
5080 }
5081 }
5082
5083 PolyKind pkind = (sym.type.hasTag(FORALL) &&
5084 sym.type.getReturnType().containsAny(((ForAll)sym.type).tvars)) ?
5085 PolyKind.POLY : PolyKind.STANDALONE;
5086 TreeInfo.setPolyKind(env.tree, pkind);
5087
5088 return (resultInfo.pt == Infer.anyPoly) ?
5089 owntype :
5090 chk.checkMethod(owntype, sym, env, argtrees, argtypes, env.info.lastResolveVarargs(),
5091 resultInfo.checkContext.inferenceContext());
5092 } catch (Infer.InferenceException ex) {
5093 //invalid target type - propagate exception outwards or report error
5094 //depending on the current check context
5095 resultInfo.checkContext.report(env.tree.pos(), ex.getDiagnostic());
5096 return types.createErrorType(site);
5097 } catch (Resolve.InapplicableMethodException ex) {
5098 final JCDiagnostic diag = ex.getDiagnostic();
5099 Resolve.InapplicableSymbolError errSym = rs.new InapplicableSymbolError(null) {
5100 @Override
5101 protected Pair<Symbol, JCDiagnostic> errCandidate() {
5102 return new Pair<>(sym, diag);
5103 }
5104 };
5105 List<Type> argtypes2 = argtypes.map(
5106 rs.new ResolveDeferredRecoveryMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase));
5107 JCDiagnostic errDiag = errSym.getDiagnostic(JCDiagnostic.DiagnosticType.ERROR,
5108 env.tree, sym, site, sym.name, argtypes2, typeargtypes);
5109 log.report(errDiag);
5110 return types.createErrorType(site);
5111 }
5112 }
5113
5114 public void visitLiteral(JCLiteral tree) {
5115 result = check(tree, litType(tree.typetag).constType(tree.value),
5116 KindSelector.VAL, resultInfo);
5117 }
5118 //where
5119 /** Return the type of a literal with given type tag.
5120 */
5121 Type litType(TypeTag tag) {
5122 return (tag == CLASS) ? syms.stringType : syms.typeOfTag[tag.ordinal()];
5123 }
5124
5125 public void visitTypeIdent(JCPrimitiveTypeTree tree) {
5126 result = check(tree, syms.typeOfTag[tree.typetag.ordinal()], KindSelector.TYP, resultInfo);
5127 }
5128
5129 public void visitTypeArray(JCArrayTypeTree tree) {
5130 Type etype = attribType(tree.elemtype, env);
5131 Type type = new ArrayType(etype, syms.arrayClass);
5132 result = check(tree, type, KindSelector.TYP, resultInfo);
5133 }
5134
5135 /** Visitor method for parameterized types.
5136 * Bound checking is left until later, since types are attributed
5137 * before supertype structure is completely known
5138 */
5139 public void visitTypeApply(JCTypeApply tree) {
5140 Type owntype = types.createErrorType(tree.type);
5141
5142 // Attribute functor part of application and make sure it's a class.
5143 Type clazztype = chk.checkClassType(tree.clazz.pos(), attribType(tree.clazz, env));
5144
5145 // Attribute type parameters
5146 List<Type> actuals = attribTypes(tree.arguments, env);
5147
5148 if (clazztype.hasTag(CLASS)) {
5149 List<Type> formals = clazztype.tsym.type.getTypeArguments();
5150 if (actuals.isEmpty()) //diamond
5151 actuals = formals;
5152
5153 if (actuals.length() == formals.length()) {
5154 List<Type> a = actuals;
5155 List<Type> f = formals;
5156 while (a.nonEmpty()) {
5157 a.head = a.head.withTypeVar(f.head);
5158 a = a.tail;
5159 f = f.tail;
5160 }
5161 // Compute the proper generic outer
5162 Type clazzOuter = clazztype.getEnclosingType();
5163 if (clazzOuter.hasTag(CLASS)) {
5164 Type site;
5165 JCExpression clazz = TreeInfo.typeIn(tree.clazz);
5166 if (clazz.hasTag(IDENT)) {
5167 site = env.enclClass.sym.type;
5168 } else if (clazz.hasTag(SELECT)) {
5169 site = ((JCFieldAccess) clazz).selected.type;
5170 } else throw new AssertionError(""+tree);
5171 if (clazzOuter.hasTag(CLASS) && site != clazzOuter) {
5172 if (site.hasTag(CLASS))
5173 site = types.asOuterSuper(site, clazzOuter.tsym);
5174 if (site == null)
5175 site = types.erasure(clazzOuter);
5176 clazzOuter = site;
5177 }
5178 }
5179 owntype = new ClassType(clazzOuter, actuals, clazztype.tsym,
5180 clazztype.getMetadata());
5181 } else {
5182 if (formals.length() != 0) {
5183 log.error(tree.pos(),
5184 Errors.WrongNumberTypeArgs(Integer.toString(formals.length())));
5185 } else {
5186 log.error(tree.pos(), Errors.TypeDoesntTakeParams(clazztype.tsym));
5187 }
5188 owntype = types.createErrorType(tree.type);
5189 }
5190 } else if (clazztype.hasTag(ERROR)) {
5191 ErrorType parameterizedErroneous =
5192 new ErrorType(clazztype.getOriginalType(),
5193 clazztype.tsym,
5194 clazztype.getMetadata());
5195
5196 parameterizedErroneous.typarams_field = actuals;
5197 owntype = parameterizedErroneous;
5198 }
5199 result = check(tree, owntype, KindSelector.TYP, resultInfo);
5200 }
5201
5202 public void visitTypeUnion(JCTypeUnion tree) {
5203 ListBuffer<Type> multicatchTypes = new ListBuffer<>();
5204 ListBuffer<Type> all_multicatchTypes = null; // lazy, only if needed
5205 for (JCExpression typeTree : tree.alternatives) {
5206 Type ctype = attribType(typeTree, env);
5207 ctype = chk.checkType(typeTree.pos(),
5208 chk.checkClassType(typeTree.pos(), ctype),
5209 syms.throwableType);
5210 if (!ctype.isErroneous()) {
5211 //check that alternatives of a union type are pairwise
5212 //unrelated w.r.t. subtyping
5213 if (chk.intersects(ctype, multicatchTypes.toList())) {
5214 for (Type t : multicatchTypes) {
5215 boolean sub = types.isSubtype(ctype, t);
5216 boolean sup = types.isSubtype(t, ctype);
5217 if (sub || sup) {
5218 //assume 'a' <: 'b'
5219 Type a = sub ? ctype : t;
5220 Type b = sub ? t : ctype;
5221 log.error(typeTree.pos(), Errors.MulticatchTypesMustBeDisjoint(a, b));
5222 }
5223 }
5224 }
5225 multicatchTypes.append(ctype);
5226 if (all_multicatchTypes != null)
5227 all_multicatchTypes.append(ctype);
5228 } else {
5229 if (all_multicatchTypes == null) {
5230 all_multicatchTypes = new ListBuffer<>();
5231 all_multicatchTypes.appendList(multicatchTypes);
5232 }
5233 all_multicatchTypes.append(ctype);
5234 }
5235 }
5236 Type t = check(tree, types.lub(multicatchTypes.toList()),
5237 KindSelector.TYP, resultInfo.dup(CheckMode.NO_TREE_UPDATE));
5238 if (t.hasTag(CLASS)) {
5239 List<Type> alternatives =
5240 ((all_multicatchTypes == null) ? multicatchTypes : all_multicatchTypes).toList();
5241 t = new UnionClassType((ClassType) t, alternatives);
5242 }
5243 tree.type = result = t;
5244 }
5245
5246 public void visitTypeIntersection(JCTypeIntersection tree) {
5247 attribTypes(tree.bounds, env);
5248 tree.type = result = checkIntersection(tree, tree.bounds);
5249 }
5250
5251 public void visitTypeParameter(JCTypeParameter tree) {
5252 TypeVar typeVar = (TypeVar) tree.type;
5253
5254 if (tree.annotations != null && tree.annotations.nonEmpty()) {
5255 annotate.annotateTypeParameterSecondStage(tree, tree.annotations);
5256 }
5257
5258 if (!typeVar.getUpperBound().isErroneous()) {
5259 //fixup type-parameter bound computed in 'attribTypeVariables'
5260 typeVar.setUpperBound(checkIntersection(tree, tree.bounds));
5261 }
5262 }
5263
5264 Type checkIntersection(JCTree tree, List<JCExpression> bounds) {
5265 Set<Symbol> boundSet = new HashSet<>();
5266 if (bounds.nonEmpty()) {
5267 // accept class or interface or typevar as first bound.
5268 bounds.head.type = checkBase(bounds.head.type, bounds.head, env, false, false, false);
5269 boundSet.add(types.erasure(bounds.head.type).tsym);
5270 if (bounds.head.type.isErroneous()) {
5271 return bounds.head.type;
5272 }
5273 else if (bounds.head.type.hasTag(TYPEVAR)) {
5274 // if first bound was a typevar, do not accept further bounds.
5275 if (bounds.tail.nonEmpty()) {
5276 log.error(bounds.tail.head.pos(),
5277 Errors.TypeVarMayNotBeFollowedByOtherBounds);
5278 return bounds.head.type;
5279 }
5280 } else {
5281 // if first bound was a class or interface, accept only interfaces
5282 // as further bounds.
5283 for (JCExpression bound : bounds.tail) {
5284 bound.type = checkBase(bound.type, bound, env, false, true, false);
5285 if (bound.type.isErroneous()) {
5286 bounds = List.of(bound);
5287 }
5288 else if (bound.type.hasTag(CLASS)) {
5289 chk.checkNotRepeated(bound.pos(), types.erasure(bound.type), boundSet);
5290 }
5291 }
5292 }
5293 }
5294
5295 if (bounds.length() == 0) {
5296 return syms.objectType;
5297 } else if (bounds.length() == 1) {
5298 return bounds.head.type;
5299 } else {
5300 Type owntype = types.makeIntersectionType(TreeInfo.types(bounds));
5301 // ... the variable's bound is a class type flagged COMPOUND
5302 // (see comment for TypeVar.bound).
5303 // In this case, generate a class tree that represents the
5304 // bound class, ...
5305 JCExpression extending;
5306 List<JCExpression> implementing;
5307 if (!bounds.head.type.isInterface()) {
5308 extending = bounds.head;
5309 implementing = bounds.tail;
5310 } else {
5311 extending = null;
5312 implementing = bounds;
5313 }
5314 JCClassDecl cd = make.at(tree).ClassDef(
5315 make.Modifiers(PUBLIC | ABSTRACT),
5316 names.empty, List.nil(),
5317 extending, implementing, List.nil());
5318
5319 ClassSymbol c = (ClassSymbol)owntype.tsym;
5320 Assert.check((c.flags() & COMPOUND) != 0);
5321 cd.sym = c;
5322 c.sourcefile = env.toplevel.sourcefile;
5323
5324 // ... and attribute the bound class
5325 c.flags_field |= UNATTRIBUTED;
5326 Env<AttrContext> cenv = enter.classEnv(cd, env);
5327 typeEnvs.put(c, cenv);
5328 attribClass(c);
5329 return owntype;
5330 }
5331 }
5332
5333 public void visitWildcard(JCWildcard tree) {
5334 //- System.err.println("visitWildcard("+tree+");");//DEBUG
5335 Type type = (tree.kind.kind == BoundKind.UNBOUND)
5336 ? syms.objectType
5337 : attribType(tree.inner, env);
5338 result = check(tree, new WildcardType(chk.checkRefType(tree.pos(), type),
5339 tree.kind.kind,
5340 syms.boundClass),
5341 KindSelector.TYP, resultInfo);
5342 }
5343
5344 public void visitAnnotation(JCAnnotation tree) {
5345 Assert.error("should be handled in annotate");
5346 }
5347
5348 @Override
5349 public void visitModifiers(JCModifiers tree) {
5350 //error recovery only:
5351 Assert.check(resultInfo.pkind == KindSelector.ERR);
5352
5353 attribAnnotationTypes(tree.annotations, env);
5354 }
5355
5356 public void visitAnnotatedType(JCAnnotatedType tree) {
5357 attribAnnotationTypes(tree.annotations, env);
5358 Type underlyingType = attribType(tree.underlyingType, env);
5359 Type annotatedType = underlyingType.preannotatedType();
5360
5361 if (!env.info.isAnonymousNewClass)
5362 annotate.annotateTypeSecondStage(tree, tree.annotations, annotatedType);
5363 result = tree.type = annotatedType;
5364 }
5365
5366 public void visitErroneous(JCErroneous tree) {
5367 if (tree.errs != null) {
5368 WriteableScope newScope = env.info.scope;
5369
5370 if (env.tree instanceof JCClassDecl) {
5371 Symbol fakeOwner =
5372 new MethodSymbol(BLOCK, names.empty, null,
5373 env.info.scope.owner);
5374 newScope = newScope.dupUnshared(fakeOwner);
5375 }
5376
5377 Env<AttrContext> errEnv =
5378 env.dup(env.tree,
5379 env.info.dup(newScope));
5380 errEnv.info.returnResult = unknownExprInfo;
5381 for (JCTree err : tree.errs)
5382 attribTree(err, errEnv, new ResultInfo(KindSelector.ERR, pt()));
5383 }
5384 result = tree.type = syms.errType;
5385 }
5386
5387 /** Default visitor method for all other trees.
5388 */
5389 public void visitTree(JCTree tree) {
5390 throw new AssertionError();
5391 }
5392
5393 /**
5394 * Attribute an env for either a top level tree or class or module declaration.
5395 */
5396 public void attrib(Env<AttrContext> env) {
5397 switch (env.tree.getTag()) {
5398 case MODULEDEF:
5399 attribModule(env.tree.pos(), ((JCModuleDecl)env.tree).sym);
5400 break;
5401 case PACKAGEDEF:
5402 attribPackage(env.tree.pos(), ((JCPackageDecl) env.tree).packge);
5403 break;
5404 default:
5405 attribClass(env.tree.pos(), env.enclClass.sym);
5406 }
5407
5408 annotate.flush();
5409 }
5410
5411 public void attribPackage(DiagnosticPosition pos, PackageSymbol p) {
5412 try {
5413 annotate.flush();
5414 attribPackage(p);
5415 } catch (CompletionFailure ex) {
5416 chk.completionError(pos, ex);
5417 }
5418 }
5419
5420 void attribPackage(PackageSymbol p) {
5421 attribWithLint(p,
5422 env -> chk.checkDeprecatedAnnotation(((JCPackageDecl) env.tree).pid.pos(), p));
5423 }
5424
5425 public void attribModule(DiagnosticPosition pos, ModuleSymbol m) {
5426 try {
5427 annotate.flush();
5428 attribModule(m);
5429 } catch (CompletionFailure ex) {
5430 chk.completionError(pos, ex);
5431 }
5432 }
5433
5434 void attribModule(ModuleSymbol m) {
5435 attribWithLint(m, env -> attribStat(env.tree, env));
5436 }
5437
5438 private void attribWithLint(TypeSymbol sym, Consumer<Env<AttrContext>> attrib) {
5439 Env<AttrContext> env = typeEnvs.get(sym);
5440
5441 Env<AttrContext> lintEnv = env;
5442 while (lintEnv.info.lint == null)
5443 lintEnv = lintEnv.next;
5444
5445 Lint lint = lintEnv.info.lint.augment(sym);
5446
5447 Lint prevLint = chk.setLint(lint);
5448 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
5449
5450 try {
5451 deferredLintHandler.flush(env.tree, lint);
5452 attrib.accept(env);
5453 } finally {
5454 log.useSource(prev);
5455 chk.setLint(prevLint);
5456 }
5457 }
5458
5459 /** Main method: attribute class definition associated with given class symbol.
5460 * reporting completion failures at the given position.
5461 * @param pos The source position at which completion errors are to be
5462 * reported.
5463 * @param c The class symbol whose definition will be attributed.
5464 */
5465 public void attribClass(DiagnosticPosition pos, ClassSymbol c) {
5466 try {
5467 annotate.flush();
5468 attribClass(c);
5469 } catch (CompletionFailure ex) {
5470 chk.completionError(pos, ex);
5471 }
5472 }
5473
5474 /** Attribute class definition associated with given class symbol.
5475 * @param c The class symbol whose definition will be attributed.
5476 */
5477 void attribClass(ClassSymbol c) throws CompletionFailure {
5478 if (c.type.hasTag(ERROR)) return;
5479
5480 // Check for cycles in the inheritance graph, which can arise from
5481 // ill-formed class files.
5482 chk.checkNonCyclic(null, c.type);
5483
5484 Type st = types.supertype(c.type);
5485 if ((c.flags_field & Flags.COMPOUND) == 0 &&
5486 (c.flags_field & Flags.SUPER_OWNER_ATTRIBUTED) == 0) {
5487 // First, attribute superclass.
5488 if (st.hasTag(CLASS))
5489 attribClass((ClassSymbol)st.tsym);
5490
5491 // Next attribute owner, if it is a class.
5492 if (c.owner.kind == TYP && c.owner.type.hasTag(CLASS))
5493 attribClass((ClassSymbol)c.owner);
5494
5495 c.flags_field |= Flags.SUPER_OWNER_ATTRIBUTED;
5496 }
5497
5498 // The previous operations might have attributed the current class
5499 // if there was a cycle. So we test first whether the class is still
5500 // UNATTRIBUTED.
5501 if ((c.flags_field & UNATTRIBUTED) != 0) {
5502 c.flags_field &= ~UNATTRIBUTED;
5503
5504 // Get environment current at the point of class definition.
5505 Env<AttrContext> env = typeEnvs.get(c);
5506
5507 // The info.lint field in the envs stored in typeEnvs is deliberately uninitialized,
5508 // because the annotations were not available at the time the env was created. Therefore,
5509 // we look up the environment chain for the first enclosing environment for which the
5510 // lint value is set. Typically, this is the parent env, but might be further if there
5511 // are any envs created as a result of TypeParameter nodes.
5512 Env<AttrContext> lintEnv = env;
5513 while (lintEnv.info.lint == null)
5514 lintEnv = lintEnv.next;
5515
5516 // Having found the enclosing lint value, we can initialize the lint value for this class
5517 env.info.lint = lintEnv.info.lint.augment(c);
5518
5519 Lint prevLint = chk.setLint(env.info.lint);
5520 JavaFileObject prev = log.useSource(c.sourcefile);
5521 ResultInfo prevReturnRes = env.info.returnResult;
5522
5523 try {
5524 if (c.isSealed() &&
5525 !c.isEnum() &&
5526 !c.isPermittedExplicit &&
5527 c.getPermittedSubclasses().isEmpty()) {
5528 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.SealedClassMustHaveSubclasses);
5529 }
5530
5531 if (c.isSealed()) {
5532 Set<Symbol> permittedTypes = new HashSet<>();
5533 boolean sealedInUnnamed = c.packge().modle == syms.unnamedModule || c.packge().modle == syms.noModule;
5534 for (Type subType : c.getPermittedSubclasses()) {
5535 if (subType.isErroneous()) {
5536 // the type already caused errors, don't produce more potentially misleading errors
5537 continue;
5538 }
5539 boolean isTypeVar = false;
5540 if (subType.getTag() == TYPEVAR) {
5541 isTypeVar = true; //error recovery
5542 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5543 Errors.InvalidPermitsClause(Fragments.IsATypeVariable(subType)));
5544 }
5545 if (subType.tsym.isAnonymous() && !c.isEnum()) {
5546 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree), Errors.LocalClassesCantExtendSealed(Fragments.Anonymous));
5547 }
5548 if (permittedTypes.contains(subType.tsym)) {
5549 DiagnosticPosition pos =
5550 env.enclClass.permitting.stream()
5551 .filter(permittedExpr -> TreeInfo.diagnosticPositionFor(subType.tsym, permittedExpr, true) != null)
5552 .limit(2).collect(List.collector()).get(1);
5553 log.error(pos, Errors.InvalidPermitsClause(Fragments.IsDuplicated(subType)));
5554 } else {
5555 permittedTypes.add(subType.tsym);
5556 }
5557 if (sealedInUnnamed) {
5558 if (subType.tsym.packge() != c.packge()) {
5559 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5560 Errors.ClassInUnnamedModuleCantExtendSealedInDiffPackage(c)
5561 );
5562 }
5563 } else if (subType.tsym.packge().modle != c.packge().modle) {
5564 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5565 Errors.ClassInModuleCantExtendSealedInDiffModule(c, c.packge().modle)
5566 );
5567 }
5568 if (subType.tsym == c.type.tsym || types.isSuperType(subType, c.type)) {
5569 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, ((JCClassDecl)env.tree).permitting),
5570 Errors.InvalidPermitsClause(
5571 subType.tsym == c.type.tsym ?
5572 Fragments.MustNotBeSameClass :
5573 Fragments.MustNotBeSupertype(subType)
5574 )
5575 );
5576 } else if (!isTypeVar) {
5577 boolean thisIsASuper = types.directSupertypes(subType)
5578 .stream()
5579 .anyMatch(d -> d.tsym == c);
5580 if (!thisIsASuper) {
5581 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree),
5582 Errors.InvalidPermitsClause(Fragments.DoesntExtendSealed(subType)));
5583 }
5584 }
5585 }
5586 }
5587
5588 List<ClassSymbol> sealedSupers = types.directSupertypes(c.type)
5589 .stream()
5590 .filter(s -> s.tsym.isSealed())
5591 .map(s -> (ClassSymbol) s.tsym)
5592 .collect(List.collector());
5593
5594 if (sealedSupers.isEmpty()) {
5595 if ((c.flags_field & Flags.NON_SEALED) != 0) {
5596 boolean hasErrorSuper = false;
5597
5598 hasErrorSuper |= types.directSupertypes(c.type)
5599 .stream()
5600 .anyMatch(s -> s.tsym.kind == Kind.ERR);
5601
5602 ClassType ct = (ClassType) c.type;
5603
5604 hasErrorSuper |= !ct.isCompound() && ct.interfaces_field != ct.all_interfaces_field;
5605
5606 if (!hasErrorSuper) {
5607 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.NonSealedWithNoSealedSupertype(c));
5608 }
5609 }
5610 } else {
5611 if (c.isDirectlyOrIndirectlyLocal() && !c.isEnum()) {
5612 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.LocalClassesCantExtendSealed(c.isAnonymous() ? Fragments.Anonymous : Fragments.Local));
5613 }
5614
5615 if (!c.type.isCompound()) {
5616 for (ClassSymbol supertypeSym : sealedSupers) {
5617 if (!supertypeSym.isPermittedSubclass(c.type.tsym)) {
5618 log.error(TreeInfo.diagnosticPositionFor(c.type.tsym, env.tree), Errors.CantInheritFromSealed(supertypeSym));
5619 }
5620 }
5621 if (!c.isNonSealed() && !c.isFinal() && !c.isSealed()) {
5622 log.error(TreeInfo.diagnosticPositionFor(c, env.tree),
5623 c.isInterface() ?
5624 Errors.NonSealedOrSealedExpected :
5625 Errors.NonSealedSealedOrFinalExpected);
5626 }
5627 }
5628 }
5629
5630 deferredLintHandler.flush(env.tree, env.info.lint);
5631 env.info.returnResult = null;
5632 // java.lang.Enum may not be subclassed by a non-enum
5633 if (st.tsym == syms.enumSym &&
5634 ((c.flags_field & (Flags.ENUM|Flags.COMPOUND)) == 0))
5635 log.error(env.tree.pos(), Errors.EnumNoSubclassing);
5636
5637 // Enums may not be extended by source-level classes
5638 if (st.tsym != null &&
5639 ((st.tsym.flags_field & Flags.ENUM) != 0) &&
5640 ((c.flags_field & (Flags.ENUM | Flags.COMPOUND)) == 0)) {
5641 log.error(env.tree.pos(), Errors.EnumTypesNotExtensible);
5642 }
5643
5644 if (rs.isSerializable(c.type)) {
5645 env.info.isSerializable = true;
5646 }
5647
5648 attribClassBody(env, c);
5649
5650 chk.checkDeprecatedAnnotation(env.tree.pos(), c);
5651 chk.checkClassOverrideEqualsAndHashIfNeeded(env.tree.pos(), c);
5652 chk.checkFunctionalInterface((JCClassDecl) env.tree, c);
5653 chk.checkLeaksNotAccessible(env, (JCClassDecl) env.tree);
5654
5655 if (c.isImplicit()) {
5656 chk.checkHasMain(env.tree.pos(), c);
5657 }
5658 } finally {
5659 env.info.returnResult = prevReturnRes;
5660 log.useSource(prev);
5661 chk.setLint(prevLint);
5662 }
5663
5664 }
5665 }
5666
5667 public void visitImport(JCImport tree) {
5668 // nothing to do
5669 }
5670
5671 public void visitModuleDef(JCModuleDecl tree) {
5672 tree.sym.completeUsesProvides();
5673 ModuleSymbol msym = tree.sym;
5674 Lint lint = env.outer.info.lint = env.outer.info.lint.augment(msym);
5675 Lint prevLint = chk.setLint(lint);
5676 chk.checkModuleName(tree);
5677 chk.checkDeprecatedAnnotation(tree, msym);
5678
5679 try {
5680 deferredLintHandler.flush(tree, lint);
5681 } finally {
5682 chk.setLint(prevLint);
5683 }
5684 }
5685
5686 /** Finish the attribution of a class. */
5687 private void attribClassBody(Env<AttrContext> env, ClassSymbol c) {
5688 JCClassDecl tree = (JCClassDecl)env.tree;
5689 Assert.check(c == tree.sym);
5690
5691 // Validate type parameters, supertype and interfaces.
5692 attribStats(tree.typarams, env);
5693 if (!c.isAnonymous()) {
5694 //already checked if anonymous
5695 chk.validate(tree.typarams, env);
5696 chk.validate(tree.extending, env);
5697 chk.validate(tree.implementing, env);
5698 }
5699
5700 c.markAbstractIfNeeded(types);
5701
5702 // If this is a non-abstract class, check that it has no abstract
5703 // methods or unimplemented methods of an implemented interface.
5704 if ((c.flags() & (ABSTRACT | INTERFACE)) == 0) {
5705 chk.checkAllDefined(tree.pos(), c);
5706 }
5707
5708 if ((c.flags() & ANNOTATION) != 0) {
5709 if (tree.implementing.nonEmpty())
5710 log.error(tree.implementing.head.pos(),
5711 Errors.CantExtendIntfAnnotation);
5712 if (tree.typarams.nonEmpty()) {
5713 log.error(tree.typarams.head.pos(),
5714 Errors.IntfAnnotationCantHaveTypeParams(c));
5715 }
5716
5717 // If this annotation type has a @Repeatable, validate
5718 Attribute.Compound repeatable = c.getAnnotationTypeMetadata().getRepeatable();
5719 // If this annotation type has a @Repeatable, validate
5720 if (repeatable != null) {
5721 // get diagnostic position for error reporting
5722 DiagnosticPosition cbPos = getDiagnosticPosition(tree, repeatable.type);
5723 Assert.checkNonNull(cbPos);
5724
5725 chk.validateRepeatable(c, repeatable, cbPos);
5726 }
5727 } else {
5728 // Check that all extended classes and interfaces
5729 // are compatible (i.e. no two define methods with same arguments
5730 // yet different return types). (JLS 8.4.8.3)
5731 chk.checkCompatibleSupertypes(tree.pos(), c.type);
5732 chk.checkDefaultMethodClashes(tree.pos(), c.type);
5733 chk.checkPotentiallyAmbiguousOverloads(tree, c.type);
5734 }
5735
5736 // Check that class does not import the same parameterized interface
5737 // with two different argument lists.
5738 chk.checkClassBounds(tree.pos(), c.type);
5739
5740 tree.type = c.type;
5741
5742 for (List<JCTypeParameter> l = tree.typarams;
5743 l.nonEmpty(); l = l.tail) {
5744 Assert.checkNonNull(env.info.scope.findFirst(l.head.name));
5745 }
5746
5747 // Check that a generic class doesn't extend Throwable
5748 if (!c.type.allparams().isEmpty() && types.isSubtype(c.type, syms.throwableType))
5749 log.error(tree.extending.pos(), Errors.GenericThrowable);
5750
5751 // Check that all methods which implement some
5752 // method conform to the method they implement.
5753 chk.checkImplementations(tree);
5754
5755 //check that a resource implementing AutoCloseable cannot throw InterruptedException
5756 checkAutoCloseable(tree.pos(), env, c.type);
5757
5758 for (List<JCTree> l = tree.defs; l.nonEmpty(); l = l.tail) {
5759 // Attribute declaration
5760 attribStat(l.head, env);
5761 // Check that declarations in inner classes are not static (JLS 8.1.2)
5762 // Make an exception for static constants.
5763 if (!allowRecords &&
5764 c.owner.kind != PCK &&
5765 ((c.flags() & STATIC) == 0 || c.name == names.empty) &&
5766 (TreeInfo.flags(l.head) & (STATIC | INTERFACE)) != 0) {
5767 VarSymbol sym = null;
5768 if (l.head.hasTag(VARDEF)) sym = ((JCVariableDecl) l.head).sym;
5769 if (sym == null ||
5770 sym.kind != VAR ||
5771 sym.getConstValue() == null)
5772 log.error(l.head.pos(), Errors.IclsCantHaveStaticDecl(c));
5773 }
5774 }
5775
5776 // Check for proper placement of super()/this() calls.
5777 chk.checkSuperInitCalls(tree);
5778
5779 // Check for cycles among non-initial constructors.
5780 chk.checkCyclicConstructors(tree);
5781
5782 // Check for cycles among annotation elements.
5783 chk.checkNonCyclicElements(tree);
5784
5785 // Check for proper use of serialVersionUID and other
5786 // serialization-related fields and methods
5787 if (env.info.lint.isEnabled(LintCategory.SERIAL)
5788 && rs.isSerializable(c.type)
5789 && !c.isAnonymous()) {
5790 chk.checkSerialStructure(tree, c);
5791 }
5792 // Correctly organize the positions of the type annotations
5793 typeAnnotations.organizeTypeAnnotationsBodies(tree);
5794
5795 // Check type annotations applicability rules
5796 validateTypeAnnotations(tree, false);
5797 }
5798 // where
5799 /** get a diagnostic position for an attribute of Type t, or null if attribute missing */
5800 private DiagnosticPosition getDiagnosticPosition(JCClassDecl tree, Type t) {
5801 for(List<JCAnnotation> al = tree.mods.annotations; !al.isEmpty(); al = al.tail) {
5802 if (types.isSameType(al.head.annotationType.type, t))
5803 return al.head.pos();
5804 }
5805
5806 return null;
5807 }
5808
5809 private Type capture(Type type) {
5810 return types.capture(type);
5811 }
5812
5813 private void setSyntheticVariableType(JCVariableDecl tree, Type type) {
5814 if (type.isErroneous()) {
5815 tree.vartype = make.at(Position.NOPOS).Erroneous();
5816 } else {
5817 tree.vartype = make.at(Position.NOPOS).Type(type);
5818 }
5819 }
5820
5821 public void validateTypeAnnotations(JCTree tree, boolean sigOnly) {
5822 tree.accept(new TypeAnnotationsValidator(sigOnly));
5823 }
5824 //where
5825 private final class TypeAnnotationsValidator extends TreeScanner {
5826
5827 private final boolean sigOnly;
5828 public TypeAnnotationsValidator(boolean sigOnly) {
5829 this.sigOnly = sigOnly;
5830 }
5831
5832 public void visitAnnotation(JCAnnotation tree) {
5833 chk.validateTypeAnnotation(tree, null, false);
5834 super.visitAnnotation(tree);
5835 }
5836 public void visitAnnotatedType(JCAnnotatedType tree) {
5837 if (!tree.underlyingType.type.isErroneous()) {
5838 super.visitAnnotatedType(tree);
5839 }
5840 }
5841 public void visitTypeParameter(JCTypeParameter tree) {
5842 chk.validateTypeAnnotations(tree.annotations, tree.type.tsym, true);
5843 scan(tree.bounds);
5844 // Don't call super.
5845 // This is needed because above we call validateTypeAnnotation with
5846 // false, which would forbid annotations on type parameters.
5847 // super.visitTypeParameter(tree);
5848 }
5849 public void visitMethodDef(JCMethodDecl tree) {
5850 if (tree.recvparam != null &&
5851 !tree.recvparam.vartype.type.isErroneous()) {
5852 checkForDeclarationAnnotations(tree.recvparam.mods.annotations, tree.recvparam.sym);
5853 }
5854 if (tree.restype != null && tree.restype.type != null) {
5855 validateAnnotatedType(tree.restype, tree.restype.type);
5856 }
5857 if (sigOnly) {
5858 scan(tree.mods);
5859 scan(tree.restype);
5860 scan(tree.typarams);
5861 scan(tree.recvparam);
5862 scan(tree.params);
5863 scan(tree.thrown);
5864 } else {
5865 scan(tree.defaultValue);
5866 scan(tree.body);
5867 }
5868 }
5869 public void visitVarDef(final JCVariableDecl tree) {
5870 //System.err.println("validateTypeAnnotations.visitVarDef " + tree);
5871 if (tree.sym != null && tree.sym.type != null && !tree.isImplicitlyTyped())
5872 validateAnnotatedType(tree.vartype, tree.sym.type);
5873 scan(tree.mods);
5874 scan(tree.vartype);
5875 if (!sigOnly) {
5876 scan(tree.init);
5877 }
5878 }
5879 public void visitTypeCast(JCTypeCast tree) {
5880 if (tree.clazz != null && tree.clazz.type != null)
5881 validateAnnotatedType(tree.clazz, tree.clazz.type);
5882 super.visitTypeCast(tree);
5883 }
5884 public void visitTypeTest(JCInstanceOf tree) {
5885 if (tree.pattern != null && !(tree.pattern instanceof JCPattern) && tree.pattern.type != null)
5886 validateAnnotatedType(tree.pattern, tree.pattern.type);
5887 super.visitTypeTest(tree);
5888 }
5889 public void visitNewClass(JCNewClass tree) {
5890 if (tree.clazz != null && tree.clazz.type != null) {
5891 if (tree.clazz.hasTag(ANNOTATED_TYPE)) {
5892 checkForDeclarationAnnotations(((JCAnnotatedType) tree.clazz).annotations,
5893 tree.clazz.type.tsym);
5894 }
5895 if (tree.def != null) {
5896 checkForDeclarationAnnotations(tree.def.mods.annotations, tree.clazz.type.tsym);
5897 }
5898
5899 validateAnnotatedType(tree.clazz, tree.clazz.type);
5900 }
5901 super.visitNewClass(tree);
5902 }
5903 public void visitNewArray(JCNewArray tree) {
5904 if (tree.elemtype != null && tree.elemtype.type != null) {
5905 if (tree.elemtype.hasTag(ANNOTATED_TYPE)) {
5906 checkForDeclarationAnnotations(((JCAnnotatedType) tree.elemtype).annotations,
5907 tree.elemtype.type.tsym);
5908 }
5909 validateAnnotatedType(tree.elemtype, tree.elemtype.type);
5910 }
5911 super.visitNewArray(tree);
5912 }
5913 public void visitClassDef(JCClassDecl tree) {
5914 //System.err.println("validateTypeAnnotations.visitClassDef " + tree);
5915 if (sigOnly) {
5916 scan(tree.mods);
5917 scan(tree.typarams);
5918 scan(tree.extending);
5919 scan(tree.implementing);
5920 }
5921 for (JCTree member : tree.defs) {
5922 if (member.hasTag(Tag.CLASSDEF)) {
5923 continue;
5924 }
5925 scan(member);
5926 }
5927 }
5928 public void visitBlock(JCBlock tree) {
5929 if (!sigOnly) {
5930 scan(tree.stats);
5931 }
5932 }
5933
5934 /* I would want to model this after
5935 * com.sun.tools.javac.comp.Check.Validator.visitSelectInternal(JCFieldAccess)
5936 * and override visitSelect and visitTypeApply.
5937 * However, we only set the annotated type in the top-level type
5938 * of the symbol.
5939 * Therefore, we need to override each individual location where a type
5940 * can occur.
5941 */
5942 private void validateAnnotatedType(final JCTree errtree, final Type type) {
5943 //System.err.println("Attr.validateAnnotatedType: " + errtree + " type: " + type);
5944
5945 if (type.isPrimitiveOrVoid()) {
5946 return;
5947 }
5948
5949 JCTree enclTr = errtree;
5950 Type enclTy = type;
5951
5952 boolean repeat = true;
5953 while (repeat) {
5954 if (enclTr.hasTag(TYPEAPPLY)) {
5955 List<Type> tyargs = enclTy.getTypeArguments();
5956 List<JCExpression> trargs = ((JCTypeApply)enclTr).getTypeArguments();
5957 if (trargs.length() > 0) {
5958 // Nothing to do for diamonds
5959 if (tyargs.length() == trargs.length()) {
5960 for (int i = 0; i < tyargs.length(); ++i) {
5961 validateAnnotatedType(trargs.get(i), tyargs.get(i));
5962 }
5963 }
5964 // If the lengths don't match, it's either a diamond
5965 // or some nested type that redundantly provides
5966 // type arguments in the tree.
5967 }
5968
5969 // Look at the clazz part of a generic type
5970 enclTr = ((JCTree.JCTypeApply)enclTr).clazz;
5971 }
5972
5973 if (enclTr.hasTag(SELECT)) {
5974 enclTr = ((JCTree.JCFieldAccess)enclTr).getExpression();
5975 if (enclTy != null &&
5976 !enclTy.hasTag(NONE)) {
5977 enclTy = enclTy.getEnclosingType();
5978 }
5979 } else if (enclTr.hasTag(ANNOTATED_TYPE)) {
5980 JCAnnotatedType at = (JCTree.JCAnnotatedType) enclTr;
5981 if (enclTy == null || enclTy.hasTag(NONE)) {
5982 ListBuffer<Attribute.TypeCompound> onlyTypeAnnotationsBuf = new ListBuffer<>();
5983 for (JCAnnotation an : at.getAnnotations()) {
5984 if (chk.isTypeAnnotation(an, false)) {
5985 onlyTypeAnnotationsBuf.add((Attribute.TypeCompound) an.attribute);
5986 }
5987 }
5988 List<Attribute.TypeCompound> onlyTypeAnnotations = onlyTypeAnnotationsBuf.toList();
5989 if (!onlyTypeAnnotations.isEmpty()) {
5990 Fragment annotationFragment = onlyTypeAnnotations.size() == 1 ?
5991 Fragments.TypeAnnotation1(onlyTypeAnnotations.head) :
5992 Fragments.TypeAnnotation(onlyTypeAnnotations);
5993 JCDiagnostic.AnnotatedType annotatedType = new JCDiagnostic.AnnotatedType(
5994 type.stripMetadata().annotatedType(onlyTypeAnnotations));
5995 log.error(at.underlyingType.pos(), Errors.TypeAnnotationInadmissible(annotationFragment,
5996 type.tsym.owner, annotatedType));
5997 }
5998 repeat = false;
5999 }
6000 enclTr = at.underlyingType;
6001 // enclTy doesn't need to be changed
6002 } else if (enclTr.hasTag(IDENT)) {
6003 repeat = false;
6004 } else if (enclTr.hasTag(JCTree.Tag.WILDCARD)) {
6005 JCWildcard wc = (JCWildcard) enclTr;
6006 if (wc.getKind() == JCTree.Kind.EXTENDS_WILDCARD ||
6007 wc.getKind() == JCTree.Kind.SUPER_WILDCARD) {
6008 validateAnnotatedType(wc.getBound(), wc.getBound().type);
6009 } else {
6010 // Nothing to do for UNBOUND
6011 }
6012 repeat = false;
6013 } else if (enclTr.hasTag(TYPEARRAY)) {
6014 JCArrayTypeTree art = (JCArrayTypeTree) enclTr;
6015 validateAnnotatedType(art.getType(), art.elemtype.type);
6016 repeat = false;
6017 } else if (enclTr.hasTag(TYPEUNION)) {
6018 JCTypeUnion ut = (JCTypeUnion) enclTr;
6019 for (JCTree t : ut.getTypeAlternatives()) {
6020 validateAnnotatedType(t, t.type);
6021 }
6022 repeat = false;
6023 } else if (enclTr.hasTag(TYPEINTERSECTION)) {
6024 JCTypeIntersection it = (JCTypeIntersection) enclTr;
6025 for (JCTree t : it.getBounds()) {
6026 validateAnnotatedType(t, t.type);
6027 }
6028 repeat = false;
6029 } else if (enclTr.getKind() == JCTree.Kind.PRIMITIVE_TYPE ||
6030 enclTr.getKind() == JCTree.Kind.ERRONEOUS) {
6031 repeat = false;
6032 } else {
6033 Assert.error("Unexpected tree: " + enclTr + " with kind: " + enclTr.getKind() +
6034 " within: "+ errtree + " with kind: " + errtree.getKind());
6035 }
6036 }
6037 }
6038
6039 private void checkForDeclarationAnnotations(List<? extends JCAnnotation> annotations,
6040 Symbol sym) {
6041 // Ensure that no declaration annotations are present.
6042 // Note that a tree type might be an AnnotatedType with
6043 // empty annotations, if only declaration annotations were given.
6044 // This method will raise an error for such a type.
6045 for (JCAnnotation ai : annotations) {
6046 if (!ai.type.isErroneous() &&
6047 typeAnnotations.annotationTargetType(ai, ai.attribute, sym) == TypeAnnotations.AnnotationType.DECLARATION) {
6048 log.error(ai.pos(), Errors.AnnotationTypeNotApplicableToType(ai.type));
6049 }
6050 }
6051 }
6052 }
6053
6054 // <editor-fold desc="post-attribution visitor">
6055
6056 /**
6057 * Handle missing types/symbols in an AST. This routine is useful when
6058 * the compiler has encountered some errors (which might have ended up
6059 * terminating attribution abruptly); if the compiler is used in fail-over
6060 * mode (e.g. by an IDE) and the AST contains semantic errors, this routine
6061 * prevents NPE to be propagated during subsequent compilation steps.
6062 */
6063 public void postAttr(JCTree tree) {
6064 new PostAttrAnalyzer().scan(tree);
6065 }
6066
6067 class PostAttrAnalyzer extends TreeScanner {
6068
6069 private void initTypeIfNeeded(JCTree that) {
6070 if (that.type == null) {
6071 if (that.hasTag(METHODDEF)) {
6072 that.type = dummyMethodType((JCMethodDecl)that);
6073 } else {
6074 that.type = syms.unknownType;
6075 }
6076 }
6077 }
6078
6079 /* Construct a dummy method type. If we have a method declaration,
6080 * and the declared return type is void, then use that return type
6081 * instead of UNKNOWN to avoid spurious error messages in lambda
6082 * bodies (see:JDK-8041704).
6083 */
6084 private Type dummyMethodType(JCMethodDecl md) {
6085 Type restype = syms.unknownType;
6086 if (md != null && md.restype != null && md.restype.hasTag(TYPEIDENT)) {
6087 JCPrimitiveTypeTree prim = (JCPrimitiveTypeTree)md.restype;
6088 if (prim.typetag == VOID)
6089 restype = syms.voidType;
6090 }
6091 return new MethodType(List.nil(), restype,
6092 List.nil(), syms.methodClass);
6093 }
6094 private Type dummyMethodType() {
6095 return dummyMethodType(null);
6096 }
6097
6098 @Override
6099 public void scan(JCTree tree) {
6100 if (tree == null) return;
6101 if (tree instanceof JCExpression) {
6102 initTypeIfNeeded(tree);
6103 }
6104 super.scan(tree);
6105 }
6106
6107 @Override
6108 public void visitIdent(JCIdent that) {
6109 if (that.sym == null) {
6110 that.sym = syms.unknownSymbol;
6111 }
6112 }
6113
6114 @Override
6115 public void visitSelect(JCFieldAccess that) {
6116 if (that.sym == null) {
6117 that.sym = syms.unknownSymbol;
6118 }
6119 super.visitSelect(that);
6120 }
6121
6122 @Override
6123 public void visitClassDef(JCClassDecl that) {
6124 initTypeIfNeeded(that);
6125 if (that.sym == null) {
6126 that.sym = new ClassSymbol(0, that.name, that.type, syms.noSymbol);
6127 }
6128 super.visitClassDef(that);
6129 }
6130
6131 @Override
6132 public void visitMethodDef(JCMethodDecl that) {
6133 initTypeIfNeeded(that);
6134 if (that.sym == null) {
6135 that.sym = new MethodSymbol(0, that.name, that.type, syms.noSymbol);
6136 }
6137 super.visitMethodDef(that);
6138 }
6139
6140 @Override
6141 public void visitVarDef(JCVariableDecl that) {
6142 initTypeIfNeeded(that);
6143 if (that.sym == null) {
6144 that.sym = new VarSymbol(0, that.name, that.type, syms.noSymbol);
6145 that.sym.adr = 0;
6146 }
6147 if (that.vartype == null) {
6148 that.vartype = make.at(Position.NOPOS).Erroneous();
6149 }
6150 super.visitVarDef(that);
6151 }
6152
6153 @Override
6154 public void visitBindingPattern(JCBindingPattern that) {
6155 initTypeIfNeeded(that);
6156 initTypeIfNeeded(that.var);
6157 if (that.var.sym == null) {
6158 that.var.sym = new BindingSymbol(0, that.var.name, that.var.type, syms.noSymbol);
6159 that.var.sym.adr = 0;
6160 }
6161 super.visitBindingPattern(that);
6162 }
6163
6164 @Override
6165 public void visitRecordPattern(JCRecordPattern that) {
6166 initTypeIfNeeded(that);
6167 if (that.record == null) {
6168 that.record = new ClassSymbol(0, TreeInfo.name(that.deconstructor),
6169 that.type, syms.noSymbol);
6170 }
6171 if (that.fullComponentTypes == null) {
6172 that.fullComponentTypes = List.nil();
6173 }
6174 super.visitRecordPattern(that);
6175 }
6176
6177 @Override
6178 public void visitNewClass(JCNewClass that) {
6179 if (that.constructor == null) {
6180 that.constructor = new MethodSymbol(0, names.init,
6181 dummyMethodType(), syms.noSymbol);
6182 }
6183 if (that.constructorType == null) {
6184 that.constructorType = syms.unknownType;
6185 }
6186 super.visitNewClass(that);
6187 }
6188
6189 @Override
6190 public void visitAssignop(JCAssignOp that) {
6191 if (that.operator == null) {
6192 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6193 -1, syms.noSymbol);
6194 }
6195 super.visitAssignop(that);
6196 }
6197
6198 @Override
6199 public void visitBinary(JCBinary that) {
6200 if (that.operator == null) {
6201 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6202 -1, syms.noSymbol);
6203 }
6204 super.visitBinary(that);
6205 }
6206
6207 @Override
6208 public void visitUnary(JCUnary that) {
6209 if (that.operator == null) {
6210 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
6211 -1, syms.noSymbol);
6212 }
6213 super.visitUnary(that);
6214 }
6215
6216 @Override
6217 public void visitReference(JCMemberReference that) {
6218 super.visitReference(that);
6219 if (that.sym == null) {
6220 that.sym = new MethodSymbol(0, names.empty, dummyMethodType(),
6221 syms.noSymbol);
6222 }
6223 }
6224 }
6225 // </editor-fold>
6226
6227 public void setPackageSymbols(JCExpression pid, Symbol pkg) {
6228 new TreeScanner() {
6229 Symbol packge = pkg;
6230 @Override
6231 public void visitIdent(JCIdent that) {
6232 that.sym = packge;
6233 }
6234
6235 @Override
6236 public void visitSelect(JCFieldAccess that) {
6237 that.sym = packge;
6238 packge = packge.owner;
6239 super.visitSelect(that);
6240 }
6241 }.scan(pid);
6242 }
6243
6244 }